diff --git a/drivers/staging/Kconfig b/drivers/staging/Kconfig
index 1324032..5474cb2 100644
--- a/drivers/staging/Kconfig
+++ b/drivers/staging/Kconfig
@@ -71,5 +71,7 @@
 
 source "drivers/staging/benet/Kconfig"
 
+source "drivers/staging/comedi/Kconfig"
+
 endif # !STAGING_EXCLUDE_BUILD
 endif # STAGING
diff --git a/drivers/staging/Makefile b/drivers/staging/Makefile
index 7c9b9b6..8948a0e 100644
--- a/drivers/staging/Makefile
+++ b/drivers/staging/Makefile
@@ -18,3 +18,4 @@
 obj-$(CONFIG_OTUS)		+= otus/
 obj-$(CONFIG_RT2860)		+= rt2860/
 obj-$(CONFIG_BENET)		+= benet/
+obj-$(CONFIG_COMEDI)		+= comedi/
diff --git a/drivers/staging/comedi/Kconfig b/drivers/staging/comedi/Kconfig
new file mode 100644
index 0000000..1d5e7cc
--- /dev/null
+++ b/drivers/staging/comedi/Kconfig
@@ -0,0 +1,13 @@
+config COMEDI
+	tristate "Data Acquision support (comedi)"
+	default N
+	---help---
+	  Enable support a wide range of data acquision devices
+	  for Linux.
+
+config COMEDI_RT
+	tristate "Comedi Real-time support"
+	depends on COMEDI && RT
+	default N
+	---help---
+	  Enable Real time support for the Comedi core.
diff --git a/drivers/staging/comedi/Makefile b/drivers/staging/comedi/Makefile
new file mode 100644
index 0000000..831d931
--- /dev/null
+++ b/drivers/staging/comedi/Makefile
@@ -0,0 +1,14 @@
+obj-$(CONFIG_COMEDI) += comedi.o
+obj-$(CONFIG_COMEDI_RT) += comedi_rt.o
+
+comedi-objs :=		\
+	comedi_fops.o	\
+	proc.o		\
+	range.o		\
+	drivers.o	\
+	comedi_compat32.o \
+	comedi_ksyms.o	\
+
+comedi_rt-objs :=	\
+	rt_pend_tq.o	\
+	rt.o
diff --git a/drivers/staging/comedi/TODO b/drivers/staging/comedi/TODO
new file mode 100644
index 0000000..55781295
--- /dev/null
+++ b/drivers/staging/comedi/TODO
@@ -0,0 +1,14 @@
+TODO:
+	- checkpatch.pl cleanups
+	- Lindent
+	- remove all wrappers
+	- remove typedefs
+	- audit userspace interface
+	- reserve major number
+	- cleanup the individual comedi drivers as well
+
+Please send patches to Greg Kroah-Hartman <greg@kroah.com> and
+copy:
+	Ian Abbott <abbotti@mev.co.uk>
+	Frank Mori Hess <fmhess@users.sourceforge.net>
+	David Schleef <ds@schleef.org>
diff --git a/drivers/staging/comedi/comedi.h b/drivers/staging/comedi/comedi.h
new file mode 100644
index 0000000..b80ddb2
--- /dev/null
+++ b/drivers/staging/comedi/comedi.h
@@ -0,0 +1,886 @@
+/*
+    include/comedi.h (installed as /usr/include/comedi.h)
+    header file for comedi
+
+    COMEDI - Linux Control and Measurement Device Interface
+    Copyright (C) 1998-2001 David A. Schleef <ds@schleef.org>
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU Lesser General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+*/
+
+#ifndef _COMEDI_H
+#define _COMEDI_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define COMEDI_MAJORVERSION	0
+#define COMEDI_MINORVERSION	7
+#define COMEDI_MICROVERSION	76
+#define VERSION	"0.7.76"
+
+/* comedi's major device number */
+#define COMEDI_MAJOR 98
+
+/*
+   maximum number of minor devices.  This can be increased, although
+   kernel structures are currently statically allocated, thus you
+   don't want this to be much more than you actually use.
+ */
+#define COMEDI_NDEVICES 16
+
+/* number of config options in the config structure */
+#define COMEDI_NDEVCONFOPTS 32
+/*length of nth chunk of firmware data*/
+#define COMEDI_DEVCONF_AUX_DATA3_LENGTH		25
+#define COMEDI_DEVCONF_AUX_DATA2_LENGTH		26
+#define COMEDI_DEVCONF_AUX_DATA1_LENGTH		27
+#define COMEDI_DEVCONF_AUX_DATA0_LENGTH		28
+#define COMEDI_DEVCONF_AUX_DATA_HI		29	/*most significant 32 bits of pointer address (if needed) */
+#define COMEDI_DEVCONF_AUX_DATA_LO		30	/*least significant 32 bits of pointer address */
+#define COMEDI_DEVCONF_AUX_DATA_LENGTH	31	/* total data length */
+
+/* max length of device and driver names */
+#define COMEDI_NAMELEN 20
+
+	typedef unsigned int lsampl_t;
+	typedef unsigned short sampl_t;
+
+/* packs and unpacks a channel/range number */
+
+#define CR_PACK(chan,rng,aref)		( (((aref)&0x3)<<24) | (((rng)&0xff)<<16) | (chan) )
+#define CR_PACK_FLAGS(chan, range, aref, flags)	(CR_PACK(chan, range, aref) | ((flags) & CR_FLAGS_MASK))
+
+#define CR_CHAN(a)	((a)&0xffff)
+#define CR_RANGE(a)	(((a)>>16)&0xff)
+#define CR_AREF(a)	(((a)>>24)&0x03)
+
+#define CR_FLAGS_MASK	0xfc000000
+#define CR_ALT_FILTER	(1<<26)
+#define CR_DITHER		CR_ALT_FILTER
+#define CR_DEGLITCH		CR_ALT_FILTER
+#define CR_ALT_SOURCE	(1<<27)
+#define CR_EDGE	(1<<30)
+#define CR_INVERT	(1<<31)
+
+#define AREF_GROUND	0x00	/* analog ref = analog ground */
+#define AREF_COMMON	0x01	/* analog ref = analog common */
+#define AREF_DIFF	0x02	/* analog ref = differential */
+#define AREF_OTHER	0x03	/* analog ref = other (undefined) */
+
+/* counters -- these are arbitrary values */
+#define GPCT_RESET		0x0001
+#define GPCT_SET_SOURCE		0x0002
+#define GPCT_SET_GATE		0x0004
+#define GPCT_SET_DIRECTION	0x0008
+#define GPCT_SET_OPERATION	0x0010
+#define GPCT_ARM		0x0020
+#define GPCT_DISARM		0x0040
+#define GPCT_GET_INT_CLK_FRQ	0x0080
+
+#define GPCT_INT_CLOCK		0x0001
+#define GPCT_EXT_PIN		0x0002
+#define GPCT_NO_GATE		0x0004
+#define GPCT_UP			0x0008
+#define GPCT_DOWN		0x0010
+#define GPCT_HWUD		0x0020
+#define GPCT_SIMPLE_EVENT	0x0040
+#define GPCT_SINGLE_PERIOD	0x0080
+#define GPCT_SINGLE_PW		0x0100
+#define GPCT_CONT_PULSE_OUT	0x0200
+#define GPCT_SINGLE_PULSE_OUT	0x0400
+
+/* instructions */
+
+#define INSN_MASK_WRITE		0x8000000
+#define INSN_MASK_READ		0x4000000
+#define INSN_MASK_SPECIAL	0x2000000
+
+#define INSN_READ		( 0 | INSN_MASK_READ)
+#define INSN_WRITE		( 1 | INSN_MASK_WRITE)
+#define INSN_BITS		( 2 | INSN_MASK_READ|INSN_MASK_WRITE)
+#define INSN_CONFIG		( 3 | INSN_MASK_READ|INSN_MASK_WRITE)
+#define INSN_GTOD		( 4 | INSN_MASK_READ|INSN_MASK_SPECIAL)
+#define INSN_WAIT		( 5 | INSN_MASK_WRITE|INSN_MASK_SPECIAL)
+#define INSN_INTTRIG		( 6 | INSN_MASK_WRITE|INSN_MASK_SPECIAL)
+
+/* trigger flags */
+/* These flags are used in comedi_trig structures */
+
+#define TRIG_BOGUS	0x0001	/* do the motions */
+#define TRIG_DITHER	0x0002	/* enable dithering */
+#define TRIG_DEGLITCH	0x0004	/* enable deglitching */
+//#define TRIG_RT       0x0008          /* perform op in real time */
+#define TRIG_CONFIG	0x0010	/* perform configuration, not triggering */
+#define TRIG_WAKE_EOS	0x0020	/* wake up on end-of-scan events */
+//#define TRIG_WRITE    0x0040          /* write to bidirectional devices */
+
+/* command flags */
+/* These flags are used in comedi_cmd structures */
+
+#define CMDF_PRIORITY		0x00000008	/* try to use a real-time interrupt while performing command */
+
+#define TRIG_RT		CMDF_PRIORITY	/* compatibility definition */
+
+#define CMDF_WRITE		0x00000040
+#define TRIG_WRITE	CMDF_WRITE	/* compatibility definition */
+
+#define CMDF_RAWDATA		0x00000080
+
+#define COMEDI_EV_START		0x00040000
+#define COMEDI_EV_SCAN_BEGIN	0x00080000
+#define COMEDI_EV_CONVERT	0x00100000
+#define COMEDI_EV_SCAN_END	0x00200000
+#define COMEDI_EV_STOP		0x00400000
+
+#define TRIG_ROUND_MASK		0x00030000
+#define TRIG_ROUND_NEAREST	0x00000000
+#define TRIG_ROUND_DOWN		0x00010000
+#define TRIG_ROUND_UP		0x00020000
+#define TRIG_ROUND_UP_NEXT	0x00030000
+
+/* trigger sources */
+
+#define TRIG_ANY	0xffffffff
+#define TRIG_INVALID	0x00000000
+
+#define TRIG_NONE	0x00000001	/* never trigger */
+#define TRIG_NOW	0x00000002	/* trigger now + N ns */
+#define TRIG_FOLLOW	0x00000004	/* trigger on next lower level trig */
+#define TRIG_TIME	0x00000008	/* trigger at time N ns */
+#define TRIG_TIMER	0x00000010	/* trigger at rate N ns */
+#define TRIG_COUNT	0x00000020	/* trigger when count reaches N */
+#define TRIG_EXT	0x00000040	/* trigger on external signal N */
+#define TRIG_INT	0x00000080	/* trigger on comedi-internal signal N */
+#define TRIG_OTHER	0x00000100	/* driver defined */
+
+/* subdevice flags */
+
+#define SDF_BUSY	0x0001	/* device is busy */
+#define SDF_BUSY_OWNER	0x0002	/* device is busy with your job */
+#define SDF_LOCKED	0x0004	/* subdevice is locked */
+#define SDF_LOCK_OWNER	0x0008	/* you own lock */
+#define SDF_MAXDATA	0x0010	/* maxdata depends on channel */
+#define SDF_FLAGS	0x0020	/* flags depend on channel */
+#define SDF_RANGETYPE	0x0040	/* range type depends on channel */
+#define SDF_MODE0	0x0080	/* can do mode 0 */
+#define SDF_MODE1	0x0100	/* can do mode 1 */
+#define SDF_MODE2	0x0200	/* can do mode 2 */
+#define SDF_MODE3	0x0400	/* can do mode 3 */
+#define SDF_MODE4	0x0800	/* can do mode 4 */
+#define SDF_CMD		0x1000	/* can do commands (deprecated) */
+#define SDF_SOFT_CALIBRATED	0x2000	/* subdevice uses software calibration */
+#define SDF_CMD_WRITE		0x4000	/* can do output commands */
+#define SDF_CMD_READ		0x8000	/* can do input commands */
+
+#define SDF_READABLE	0x00010000	/* subdevice can be read (e.g. analog input) */
+#define SDF_WRITABLE	0x00020000	/* subdevice can be written (e.g. analog output) */
+#define SDF_WRITEABLE	SDF_WRITABLE	/* spelling error in API */
+#define SDF_INTERNAL	0x00040000	/* subdevice does not have externally visible lines */
+#define SDF_RT		0x00080000	/* DEPRECATED: subdevice is RT capable */
+#define SDF_GROUND	0x00100000	/* can do aref=ground */
+#define SDF_COMMON	0x00200000	/* can do aref=common */
+#define SDF_DIFF	0x00400000	/* can do aref=diff */
+#define SDF_OTHER	0x00800000	/* can do aref=other */
+#define SDF_DITHER	0x01000000	/* can do dithering */
+#define SDF_DEGLITCH	0x02000000	/* can do deglitching */
+#define SDF_MMAP	0x04000000	/* can do mmap() */
+#define SDF_RUNNING	0x08000000	/* subdevice is acquiring data */
+#define SDF_LSAMPL	0x10000000	/* subdevice uses 32-bit samples */
+#define SDF_PACKED	0x20000000	/* subdevice can do packed DIO */
+/* re recyle these flags for PWM */
+#define SDF_PWM_COUNTER SDF_MODE0       /* PWM can automatically switch off */
+#define SDF_PWM_HBRIDGE SDF_MODE1       /* PWM is signed (H-bridge) */
+
+
+
+/* subdevice types */
+
+	enum comedi_subdevice_type {
+		COMEDI_SUBD_UNUSED,	/* unused by driver */
+		COMEDI_SUBD_AI,	/* analog input */
+		COMEDI_SUBD_AO,	/* analog output */
+		COMEDI_SUBD_DI,	/* digital input */
+		COMEDI_SUBD_DO,	/* digital output */
+		COMEDI_SUBD_DIO,	/* digital input/output */
+		COMEDI_SUBD_COUNTER,	/* counter */
+		COMEDI_SUBD_TIMER,	/* timer */
+		COMEDI_SUBD_MEMORY,	/* memory, EEPROM, DPRAM */
+		COMEDI_SUBD_CALIB,	/* calibration DACs */
+		COMEDI_SUBD_PROC,	/* processor, DSP */
+		COMEDI_SUBD_SERIAL,	/* serial IO */
+		COMEDI_SUBD_PWM         /* PWM */
+	};
+
+/* configuration instructions */
+
+	enum configuration_ids {
+		INSN_CONFIG_DIO_INPUT = 0,
+		INSN_CONFIG_DIO_OUTPUT = 1,
+		INSN_CONFIG_DIO_OPENDRAIN = 2,
+		INSN_CONFIG_ANALOG_TRIG = 16,
+//      INSN_CONFIG_WAVEFORM = 17,
+//      INSN_CONFIG_TRIG = 18,
+//      INSN_CONFIG_COUNTER = 19,
+		INSN_CONFIG_ALT_SOURCE = 20,
+		INSN_CONFIG_DIGITAL_TRIG = 21,
+		INSN_CONFIG_BLOCK_SIZE = 22,
+		INSN_CONFIG_TIMER_1 = 23,
+		INSN_CONFIG_FILTER = 24,
+		INSN_CONFIG_CHANGE_NOTIFY = 25,
+
+		 /*ALPHA*/ INSN_CONFIG_SERIAL_CLOCK = 26,
+		INSN_CONFIG_BIDIRECTIONAL_DATA = 27,
+		INSN_CONFIG_DIO_QUERY = 28,
+		INSN_CONFIG_PWM_OUTPUT = 29,
+		INSN_CONFIG_GET_PWM_OUTPUT = 30,
+		INSN_CONFIG_ARM = 31,
+		INSN_CONFIG_DISARM = 32,
+		INSN_CONFIG_GET_COUNTER_STATUS = 33,
+		INSN_CONFIG_RESET = 34,
+		INSN_CONFIG_GPCT_SINGLE_PULSE_GENERATOR = 1001,	// Use CTR as single pulsegenerator
+		INSN_CONFIG_GPCT_PULSE_TRAIN_GENERATOR = 1002,	// Use CTR as pulsetraingenerator
+		INSN_CONFIG_GPCT_QUADRATURE_ENCODER = 1003,	// Use the counter as encoder
+		INSN_CONFIG_SET_GATE_SRC = 2001,	// Set gate source
+		INSN_CONFIG_GET_GATE_SRC = 2002,	// Get gate source
+		INSN_CONFIG_SET_CLOCK_SRC = 2003,	// Set master clock source
+		INSN_CONFIG_GET_CLOCK_SRC = 2004,	// Get master clock source
+		INSN_CONFIG_SET_OTHER_SRC = 2005,	// Set other source
+//      INSN_CONFIG_GET_OTHER_SRC = 2006,       // Get other source
+		INSN_CONFIG_GET_HARDWARE_BUFFER_SIZE,	// Get size in bytes of subdevice's on-board fifos used during streaming input/output
+		INSN_CONFIG_SET_COUNTER_MODE = 4097,
+		INSN_CONFIG_8254_SET_MODE = INSN_CONFIG_SET_COUNTER_MODE,	/* deprecated */
+		INSN_CONFIG_8254_READ_STATUS = 4098,
+		INSN_CONFIG_SET_ROUTING = 4099,
+		INSN_CONFIG_GET_ROUTING = 4109,
+/* PWM */
+		INSN_CONFIG_PWM_SET_PERIOD = 5000,   /* sets frequency */
+		INSN_CONFIG_PWM_GET_PERIOD = 5001,   /* gets frequency */
+		INSN_CONFIG_GET_PWM_STATUS = 5002,          /* is it running? */
+		INSN_CONFIG_PWM_SET_H_BRIDGE = 5003, /* sets H bridge: duty cycle and sign bit for a relay  at the same time*/
+		INSN_CONFIG_PWM_GET_H_BRIDGE = 5004  /* gets H bridge data: duty cycle and the sign bit */
+	};
+
+	enum comedi_io_direction {
+		COMEDI_INPUT = 0,
+		COMEDI_OUTPUT = 1,
+		COMEDI_OPENDRAIN = 2
+	};
+
+	enum comedi_support_level
+	{
+		COMEDI_UNKNOWN_SUPPORT = 0,
+		COMEDI_SUPPORTED,
+		COMEDI_UNSUPPORTED
+	};
+
+/* ioctls */
+
+#define CIO 'd'
+#define COMEDI_DEVCONFIG _IOW(CIO,0,comedi_devconfig)
+#define COMEDI_DEVINFO _IOR(CIO,1,comedi_devinfo)
+#define COMEDI_SUBDINFO _IOR(CIO,2,comedi_subdinfo)
+#define COMEDI_CHANINFO _IOR(CIO,3,comedi_chaninfo)
+#define COMEDI_TRIG _IOWR(CIO,4,comedi_trig)
+#define COMEDI_LOCK _IO(CIO,5)
+#define COMEDI_UNLOCK _IO(CIO,6)
+#define COMEDI_CANCEL _IO(CIO,7)
+#define COMEDI_RANGEINFO _IOR(CIO,8,comedi_rangeinfo)
+#define COMEDI_CMD _IOR(CIO,9,comedi_cmd)
+#define COMEDI_CMDTEST _IOR(CIO,10,comedi_cmd)
+#define COMEDI_INSNLIST _IOR(CIO,11,comedi_insnlist)
+#define COMEDI_INSN _IOR(CIO,12,comedi_insn)
+#define COMEDI_BUFCONFIG _IOR(CIO,13,comedi_bufconfig)
+#define COMEDI_BUFINFO _IOWR(CIO,14,comedi_bufinfo)
+#define COMEDI_POLL _IO(CIO,15)
+
+/* structures */
+
+	typedef struct comedi_trig_struct comedi_trig;
+	typedef struct comedi_cmd_struct comedi_cmd;
+	typedef struct comedi_insn_struct comedi_insn;
+	typedef struct comedi_insnlist_struct comedi_insnlist;
+	typedef struct comedi_chaninfo_struct comedi_chaninfo;
+	typedef struct comedi_subdinfo_struct comedi_subdinfo;
+	typedef struct comedi_devinfo_struct comedi_devinfo;
+	typedef struct comedi_devconfig_struct comedi_devconfig;
+	typedef struct comedi_rangeinfo_struct comedi_rangeinfo;
+	typedef struct comedi_krange_struct comedi_krange;
+	typedef struct comedi_bufconfig_struct comedi_bufconfig;
+	typedef struct comedi_bufinfo_struct comedi_bufinfo;
+
+	struct comedi_trig_struct {
+		unsigned int subdev;	/* subdevice */
+		unsigned int mode;	/* mode */
+		unsigned int flags;
+		unsigned int n_chan;	/* number of channels */
+		unsigned int *chanlist;	/* channel/range list */
+		sampl_t *data;	/* data list, size depends on subd flags */
+		unsigned int n;	/* number of scans */
+		unsigned int trigsrc;
+		unsigned int trigvar;
+		unsigned int trigvar1;
+		unsigned int data_len;
+		unsigned int unused[3];
+	};
+
+	struct comedi_insn_struct {
+		unsigned int insn;
+		unsigned int n;
+		lsampl_t *data;
+		unsigned int subdev;
+		unsigned int chanspec;
+		unsigned int unused[3];
+	};
+
+	struct comedi_insnlist_struct {
+		unsigned int n_insns;
+		comedi_insn *insns;
+	};
+
+	struct comedi_cmd_struct {
+		unsigned int subdev;
+		unsigned int flags;
+
+		unsigned int start_src;
+		unsigned int start_arg;
+
+		unsigned int scan_begin_src;
+		unsigned int scan_begin_arg;
+
+		unsigned int convert_src;
+		unsigned int convert_arg;
+
+		unsigned int scan_end_src;
+		unsigned int scan_end_arg;
+
+		unsigned int stop_src;
+		unsigned int stop_arg;
+
+		unsigned int *chanlist;	/* channel/range list */
+		unsigned int chanlist_len;
+
+		sampl_t *data;	/* data list, size depends on subd flags */
+		unsigned int data_len;
+	};
+
+	struct comedi_chaninfo_struct {
+		unsigned int subdev;
+		lsampl_t *maxdata_list;
+		unsigned int *flaglist;
+		unsigned int *rangelist;
+		unsigned int unused[4];
+	};
+
+	struct comedi_rangeinfo_struct {
+		unsigned int range_type;
+		void *range_ptr;
+	};
+
+	struct comedi_krange_struct {
+		int min;	/* fixed point, multiply by 1e-6 */
+		int max;	/* fixed point, multiply by 1e-6 */
+		unsigned int flags;
+	};
+
+
+	struct comedi_subdinfo_struct {
+		unsigned int type;
+		unsigned int n_chan;
+		unsigned int subd_flags;
+		unsigned int timer_type;
+		unsigned int len_chanlist;
+		lsampl_t maxdata;
+		unsigned int flags;	/* channel flags */
+		unsigned int range_type;	/* lookup in kernel */
+		unsigned int settling_time_0;
+		unsigned insn_bits_support;	/* see support_level enum for values*/
+		unsigned int unused[8];
+	};
+
+	struct comedi_devinfo_struct {
+		unsigned int version_code;
+		unsigned int n_subdevs;
+		char driver_name[COMEDI_NAMELEN];
+		char board_name[COMEDI_NAMELEN];
+		int read_subdevice;
+		int write_subdevice;
+		int unused[30];
+	};
+
+	struct comedi_devconfig_struct {
+		char board_name[COMEDI_NAMELEN];
+		int options[COMEDI_NDEVCONFOPTS];
+	};
+
+	struct comedi_bufconfig_struct {
+		unsigned int subdevice;
+		unsigned int flags;
+
+		unsigned int maximum_size;
+		unsigned int size;
+
+		unsigned int unused[4];
+	};
+
+	struct comedi_bufinfo_struct {
+		unsigned int subdevice;
+		unsigned int bytes_read;
+
+		unsigned int buf_write_ptr;
+		unsigned int buf_read_ptr;
+		unsigned int buf_write_count;
+		unsigned int buf_read_count;
+
+		unsigned int bytes_written;
+
+		unsigned int unused[4];
+	};
+
+/* range stuff */
+
+#define __RANGE(a,b)	((((a)&0xffff)<<16)|((b)&0xffff))
+
+#define RANGE_OFFSET(a)		(((a)>>16)&0xffff)
+#define RANGE_LENGTH(b)		((b)&0xffff)
+
+#define RF_UNIT(flags)		((flags)&0xff)
+#define RF_EXTERNAL		(1<<8)
+
+#define UNIT_volt		0
+#define UNIT_mA			1
+#define UNIT_none		2
+
+#define COMEDI_MIN_SPEED	((unsigned int)0xffffffff)
+
+/* callback stuff */
+/* only relevant to kernel modules. */
+
+#define COMEDI_CB_EOS		1	/* end of scan */
+#define COMEDI_CB_EOA		2	/* end of acquisition */
+#define COMEDI_CB_BLOCK		4	/* DEPRECATED: convenient block size */
+#define COMEDI_CB_EOBUF		8	/* DEPRECATED: end of buffer */
+#define COMEDI_CB_ERROR		16	/* card error during acquisition */
+#define COMEDI_CB_OVERFLOW	32	/* buffer overflow/underflow */
+
+/**********************************************************/
+/* everything after this line is ALPHA */
+/**********************************************************/
+
+/*
+  8254 specific configuration.
+
+  It supports two config commands:
+
+  0 ID: INSN_CONFIG_SET_COUNTER_MODE
+  1 8254 Mode
+    I8254_MODE0, I8254_MODE1, ..., I8254_MODE5
+    OR'ed with:
+    I8254_BCD, I8254_BINARY
+
+  0 ID: INSN_CONFIG_8254_READ_STATUS
+  1 <-- Status byte returned here.
+    B7=Output
+    B6=NULL Count
+    B5-B0 Current mode.
+
+*/
+
+	enum i8254_mode {
+		I8254_MODE0 = (0 << 1),	/* Interrupt on terminal count */
+		I8254_MODE1 = (1 << 1),	/* Hardware retriggerable one-shot */
+		I8254_MODE2 = (2 << 1),	/* Rate generator */
+		I8254_MODE3 = (3 << 1),	/* Square wave mode */
+		I8254_MODE4 = (4 << 1),	/* Software triggered strobe */
+		I8254_MODE5 = (5 << 1),	/* Hardware triggered strobe (retriggerable) */
+		I8254_BCD = 1,	/* use binary-coded decimal instead of binary (pretty useless) */
+		I8254_BINARY = 0
+	};
+
+	static inline unsigned NI_USUAL_PFI_SELECT(unsigned pfi_channel) {
+		if (pfi_channel < 10)
+			return 0x1 + pfi_channel;
+		else
+			return 0xb + pfi_channel;
+	} static inline unsigned NI_USUAL_RTSI_SELECT(unsigned rtsi_channel) {
+		if (rtsi_channel < 7)
+			return 0xb + rtsi_channel;
+		else
+			return 0x1b;
+	}
+/* mode bits for NI general-purpose counters, set with INSN_CONFIG_SET_COUNTER_MODE */
+#define NI_GPCT_COUNTING_MODE_SHIFT 16
+#define NI_GPCT_INDEX_PHASE_BITSHIFT 20
+#define NI_GPCT_COUNTING_DIRECTION_SHIFT 24
+	enum ni_gpct_mode_bits {
+		NI_GPCT_GATE_ON_BOTH_EDGES_BIT = 0x4,
+		NI_GPCT_EDGE_GATE_MODE_MASK = 0x18,
+		NI_GPCT_EDGE_GATE_STARTS_STOPS_BITS = 0x0,
+		NI_GPCT_EDGE_GATE_STOPS_STARTS_BITS = 0x8,
+		NI_GPCT_EDGE_GATE_STARTS_BITS = 0x10,
+		NI_GPCT_EDGE_GATE_NO_STARTS_NO_STOPS_BITS = 0x18,
+		NI_GPCT_STOP_MODE_MASK = 0x60,
+		NI_GPCT_STOP_ON_GATE_BITS = 0x00,
+		NI_GPCT_STOP_ON_GATE_OR_TC_BITS = 0x20,
+		NI_GPCT_STOP_ON_GATE_OR_SECOND_TC_BITS = 0x40,
+		NI_GPCT_LOAD_B_SELECT_BIT = 0x80,
+		NI_GPCT_OUTPUT_MODE_MASK = 0x300,
+		NI_GPCT_OUTPUT_TC_PULSE_BITS = 0x100,
+		NI_GPCT_OUTPUT_TC_TOGGLE_BITS = 0x200,
+		NI_GPCT_OUTPUT_TC_OR_GATE_TOGGLE_BITS = 0x300,
+		NI_GPCT_HARDWARE_DISARM_MASK = 0xc00,
+		NI_GPCT_NO_HARDWARE_DISARM_BITS = 0x000,
+		NI_GPCT_DISARM_AT_TC_BITS = 0x400,
+		NI_GPCT_DISARM_AT_GATE_BITS = 0x800,
+		NI_GPCT_DISARM_AT_TC_OR_GATE_BITS = 0xc00,
+		NI_GPCT_LOADING_ON_TC_BIT = 0x1000,
+		NI_GPCT_LOADING_ON_GATE_BIT = 0x4000,
+		NI_GPCT_COUNTING_MODE_MASK = 0x7 << NI_GPCT_COUNTING_MODE_SHIFT,
+		NI_GPCT_COUNTING_MODE_NORMAL_BITS =
+			0x0 << NI_GPCT_COUNTING_MODE_SHIFT,
+		NI_GPCT_COUNTING_MODE_QUADRATURE_X1_BITS =
+			0x1 << NI_GPCT_COUNTING_MODE_SHIFT,
+		NI_GPCT_COUNTING_MODE_QUADRATURE_X2_BITS =
+			0x2 << NI_GPCT_COUNTING_MODE_SHIFT,
+		NI_GPCT_COUNTING_MODE_QUADRATURE_X4_BITS =
+			0x3 << NI_GPCT_COUNTING_MODE_SHIFT,
+		NI_GPCT_COUNTING_MODE_TWO_PULSE_BITS =
+			0x4 << NI_GPCT_COUNTING_MODE_SHIFT,
+		NI_GPCT_COUNTING_MODE_SYNC_SOURCE_BITS =
+			0x6 << NI_GPCT_COUNTING_MODE_SHIFT,
+		NI_GPCT_INDEX_PHASE_MASK = 0x3 << NI_GPCT_INDEX_PHASE_BITSHIFT,
+		NI_GPCT_INDEX_PHASE_LOW_A_LOW_B_BITS =
+			0x0 << NI_GPCT_INDEX_PHASE_BITSHIFT,
+		NI_GPCT_INDEX_PHASE_LOW_A_HIGH_B_BITS =
+			0x1 << NI_GPCT_INDEX_PHASE_BITSHIFT,
+		NI_GPCT_INDEX_PHASE_HIGH_A_LOW_B_BITS =
+			0x2 << NI_GPCT_INDEX_PHASE_BITSHIFT,
+		NI_GPCT_INDEX_PHASE_HIGH_A_HIGH_B_BITS =
+			0x3 << NI_GPCT_INDEX_PHASE_BITSHIFT,
+		NI_GPCT_INDEX_ENABLE_BIT = 0x400000,
+		NI_GPCT_COUNTING_DIRECTION_MASK =
+			0x3 << NI_GPCT_COUNTING_DIRECTION_SHIFT,
+		NI_GPCT_COUNTING_DIRECTION_DOWN_BITS =
+			0x00 << NI_GPCT_COUNTING_DIRECTION_SHIFT,
+		NI_GPCT_COUNTING_DIRECTION_UP_BITS =
+			0x1 << NI_GPCT_COUNTING_DIRECTION_SHIFT,
+		NI_GPCT_COUNTING_DIRECTION_HW_UP_DOWN_BITS =
+			0x2 << NI_GPCT_COUNTING_DIRECTION_SHIFT,
+		NI_GPCT_COUNTING_DIRECTION_HW_GATE_BITS =
+			0x3 << NI_GPCT_COUNTING_DIRECTION_SHIFT,
+		NI_GPCT_RELOAD_SOURCE_MASK = 0xc000000,
+		NI_GPCT_RELOAD_SOURCE_FIXED_BITS = 0x0,
+		NI_GPCT_RELOAD_SOURCE_SWITCHING_BITS = 0x4000000,
+		NI_GPCT_RELOAD_SOURCE_GATE_SELECT_BITS = 0x8000000,
+		NI_GPCT_OR_GATE_BIT = 0x10000000,
+		NI_GPCT_INVERT_OUTPUT_BIT = 0x20000000
+	};
+
+/* Bits for setting a clock source with
+ * INSN_CONFIG_SET_CLOCK_SRC when using NI general-purpose counters. */
+	enum ni_gpct_clock_source_bits {
+		NI_GPCT_CLOCK_SRC_SELECT_MASK = 0x3f,
+		NI_GPCT_TIMEBASE_1_CLOCK_SRC_BITS = 0x0,
+		NI_GPCT_TIMEBASE_2_CLOCK_SRC_BITS = 0x1,
+		NI_GPCT_TIMEBASE_3_CLOCK_SRC_BITS = 0x2,
+		NI_GPCT_LOGIC_LOW_CLOCK_SRC_BITS = 0x3,
+		NI_GPCT_NEXT_GATE_CLOCK_SRC_BITS = 0x4,
+		NI_GPCT_NEXT_TC_CLOCK_SRC_BITS = 0x5,
+		NI_GPCT_SOURCE_PIN_i_CLOCK_SRC_BITS = 0x6,	/* NI 660x-specific */
+		NI_GPCT_PXI10_CLOCK_SRC_BITS = 0x7,
+		NI_GPCT_PXI_STAR_TRIGGER_CLOCK_SRC_BITS = 0x8,
+		NI_GPCT_ANALOG_TRIGGER_OUT_CLOCK_SRC_BITS = 0x9,
+		NI_GPCT_PRESCALE_MODE_CLOCK_SRC_MASK = 0x30000000,
+		NI_GPCT_NO_PRESCALE_CLOCK_SRC_BITS = 0x0,
+		NI_GPCT_PRESCALE_X2_CLOCK_SRC_BITS = 0x10000000,	/* divide source by 2 */
+		NI_GPCT_PRESCALE_X8_CLOCK_SRC_BITS = 0x20000000,	/* divide source by 8 */
+		NI_GPCT_INVERT_CLOCK_SRC_BIT = 0x80000000
+	};
+	static inline unsigned NI_GPCT_SOURCE_PIN_CLOCK_SRC_BITS(unsigned n) {	/* NI 660x-specific */
+		return 0x10 + n;
+	}
+	static inline unsigned NI_GPCT_RTSI_CLOCK_SRC_BITS(unsigned n) {
+		return 0x18 + n;
+	}
+	static inline unsigned NI_GPCT_PFI_CLOCK_SRC_BITS(unsigned n) {	/* no pfi on NI 660x */
+		return 0x20 + n;
+	}
+
+/* Possibilities for setting a gate source with
+INSN_CONFIG_SET_GATE_SRC when using NI general-purpose counters.
+May be bitwise-or'd with CR_EDGE or CR_INVERT. */
+	enum ni_gpct_gate_select {
+		/* m-series gates */
+		NI_GPCT_TIMESTAMP_MUX_GATE_SELECT = 0x0,
+		NI_GPCT_AI_START2_GATE_SELECT = 0x12,
+		NI_GPCT_PXI_STAR_TRIGGER_GATE_SELECT = 0x13,
+		NI_GPCT_NEXT_OUT_GATE_SELECT = 0x14,
+		NI_GPCT_AI_START1_GATE_SELECT = 0x1c,
+		NI_GPCT_NEXT_SOURCE_GATE_SELECT = 0x1d,
+		NI_GPCT_ANALOG_TRIGGER_OUT_GATE_SELECT = 0x1e,
+		NI_GPCT_LOGIC_LOW_GATE_SELECT = 0x1f,
+		/* more gates for 660x */
+		NI_GPCT_SOURCE_PIN_i_GATE_SELECT = 0x100,
+		NI_GPCT_GATE_PIN_i_GATE_SELECT = 0x101,
+		/* more gates for 660x "second gate" */
+		NI_GPCT_UP_DOWN_PIN_i_GATE_SELECT = 0x201,
+		NI_GPCT_SELECTED_GATE_GATE_SELECT = 0x21e,
+		/* m-series "second gate" sources are unknown,
+		   we should add them here with an offset of 0x300 when known. */
+		NI_GPCT_DISABLED_GATE_SELECT = 0x8000,
+	};
+	static inline unsigned NI_GPCT_GATE_PIN_GATE_SELECT(unsigned n) {
+		return 0x102 + n;
+	}
+	static inline unsigned NI_GPCT_RTSI_GATE_SELECT(unsigned n) {
+		return NI_USUAL_RTSI_SELECT(n);
+	}
+	static inline unsigned NI_GPCT_PFI_GATE_SELECT(unsigned n) {
+		return NI_USUAL_PFI_SELECT(n);
+	}
+	static inline unsigned NI_GPCT_UP_DOWN_PIN_GATE_SELECT(unsigned n) {
+		return 0x202 + n;
+	}
+
+/* Possibilities for setting a source with
+INSN_CONFIG_SET_OTHER_SRC when using NI general-purpose counters. */
+	enum ni_gpct_other_index {
+		NI_GPCT_SOURCE_ENCODER_A,
+		NI_GPCT_SOURCE_ENCODER_B,
+		NI_GPCT_SOURCE_ENCODER_Z
+	};
+	enum ni_gpct_other_select {
+		/* m-series gates */
+		// Still unknown, probably only need NI_GPCT_PFI_OTHER_SELECT
+		NI_GPCT_DISABLED_OTHER_SELECT = 0x8000,
+	};
+	static inline unsigned NI_GPCT_PFI_OTHER_SELECT(unsigned n) {
+		return NI_USUAL_PFI_SELECT(n);
+	}
+
+/* start sources for ni general-purpose counters for use with
+INSN_CONFIG_ARM */
+	enum ni_gpct_arm_source {
+		NI_GPCT_ARM_IMMEDIATE = 0x0,
+		NI_GPCT_ARM_PAIRED_IMMEDIATE = 0x1,	/* Start both the counter and the adjacent paired counter simultaneously */
+		/* NI doesn't document bits for selecting hardware arm triggers.  If
+		   the NI_GPCT_ARM_UNKNOWN bit is set, we will pass the least significant
+		   bits (3 bits for 660x or 5 bits for m-series) through to the hardware.
+		   This will at least allow someone to figure out what the bits do later. */
+		NI_GPCT_ARM_UNKNOWN = 0x1000,
+	};
+
+/* digital filtering options for ni 660x for use with INSN_CONFIG_FILTER. */
+	enum ni_gpct_filter_select {
+		NI_GPCT_FILTER_OFF = 0x0,
+		NI_GPCT_FILTER_TIMEBASE_3_SYNC = 0x1,
+		NI_GPCT_FILTER_100x_TIMEBASE_1 = 0x2,
+		NI_GPCT_FILTER_20x_TIMEBASE_1 = 0x3,
+		NI_GPCT_FILTER_10x_TIMEBASE_1 = 0x4,
+		NI_GPCT_FILTER_2x_TIMEBASE_1 = 0x5,
+		NI_GPCT_FILTER_2x_TIMEBASE_3 = 0x6
+	};
+
+/* PFI digital filtering options for ni m-series for use with INSN_CONFIG_FILTER. */
+	enum ni_pfi_filter_select {
+		NI_PFI_FILTER_OFF = 0x0,
+		NI_PFI_FILTER_125ns = 0x1,
+		NI_PFI_FILTER_6425ns = 0x2,
+		NI_PFI_FILTER_2550us = 0x3
+	};
+
+/* master clock sources for ni mio boards and INSN_CONFIG_SET_CLOCK_SRC */
+	enum ni_mio_clock_source {
+		NI_MIO_INTERNAL_CLOCK = 0,
+		NI_MIO_RTSI_CLOCK = 1,	/* doesn't work for m-series, use NI_MIO_PLL_RTSI_CLOCK() */
+		/* the NI_MIO_PLL_* sources are m-series only */
+		NI_MIO_PLL_PXI_STAR_TRIGGER_CLOCK = 2,
+		NI_MIO_PLL_PXI10_CLOCK = 3,
+		NI_MIO_PLL_RTSI0_CLOCK = 4
+	};
+	static inline unsigned NI_MIO_PLL_RTSI_CLOCK(unsigned rtsi_channel) {
+		return NI_MIO_PLL_RTSI0_CLOCK + rtsi_channel;
+	}
+
+/* Signals which can be routed to an NI RTSI pin with INSN_CONFIG_SET_ROUTING.
+ The numbers assigned are not arbitrary, they correspond to the bits required
+ to program the board. */
+	enum ni_rtsi_routing {
+		NI_RTSI_OUTPUT_ADR_START1 = 0,
+		NI_RTSI_OUTPUT_ADR_START2 = 1,
+		NI_RTSI_OUTPUT_SCLKG = 2,
+		NI_RTSI_OUTPUT_DACUPDN = 3,
+		NI_RTSI_OUTPUT_DA_START1 = 4,
+		NI_RTSI_OUTPUT_G_SRC0 = 5,
+		NI_RTSI_OUTPUT_G_GATE0 = 6,
+		NI_RTSI_OUTPUT_RGOUT0 = 7,
+		NI_RTSI_OUTPUT_RTSI_BRD_0 = 8,
+		NI_RTSI_OUTPUT_RTSI_OSC = 12	/* pre-m-series always have RTSI clock on line 7 */
+	};
+	static inline unsigned NI_RTSI_OUTPUT_RTSI_BRD(unsigned n) {
+		return NI_RTSI_OUTPUT_RTSI_BRD_0 + n;
+	}
+
+/* Signals which can be routed to an NI PFI pin on an m-series board
+ with INSN_CONFIG_SET_ROUTING.  These numbers are also returned
+ by INSN_CONFIG_GET_ROUTING on pre-m-series boards, even though
+ their routing cannot be changed.  The numbers assigned are
+ not arbitrary, they correspond to the bits required
+ to program the board. */
+	enum ni_pfi_routing {
+		NI_PFI_OUTPUT_PFI_DEFAULT = 0,
+		NI_PFI_OUTPUT_AI_START1 = 1,
+		NI_PFI_OUTPUT_AI_START2 = 2,
+		NI_PFI_OUTPUT_AI_CONVERT = 3,
+		NI_PFI_OUTPUT_G_SRC1 = 4,
+		NI_PFI_OUTPUT_G_GATE1 = 5,
+		NI_PFI_OUTPUT_AO_UPDATE_N = 6,
+		NI_PFI_OUTPUT_AO_START1 = 7,
+		NI_PFI_OUTPUT_AI_START_PULSE = 8,
+		NI_PFI_OUTPUT_G_SRC0 = 9,
+		NI_PFI_OUTPUT_G_GATE0 = 10,
+		NI_PFI_OUTPUT_EXT_STROBE = 11,
+		NI_PFI_OUTPUT_AI_EXT_MUX_CLK = 12,
+		NI_PFI_OUTPUT_GOUT0 = 13,
+		NI_PFI_OUTPUT_GOUT1 = 14,
+		NI_PFI_OUTPUT_FREQ_OUT = 15,
+		NI_PFI_OUTPUT_PFI_DO = 16,
+		NI_PFI_OUTPUT_I_ATRIG = 17,
+		NI_PFI_OUTPUT_RTSI0 = 18,
+		NI_PFI_OUTPUT_PXI_STAR_TRIGGER_IN = 26,
+		NI_PFI_OUTPUT_SCXI_TRIG1 = 27,
+		NI_PFI_OUTPUT_DIO_CHANGE_DETECT_RTSI = 28,
+		NI_PFI_OUTPUT_CDI_SAMPLE = 29,
+		NI_PFI_OUTPUT_CDO_UPDATE = 30
+	};
+	static inline unsigned NI_PFI_OUTPUT_RTSI(unsigned rtsi_channel) {
+		return NI_PFI_OUTPUT_RTSI0 + rtsi_channel;
+	}
+
+/* Signals which can be routed to output on a NI PFI pin on a 660x board
+ with INSN_CONFIG_SET_ROUTING.  The numbers assigned are
+ not arbitrary, they correspond to the bits required
+ to program the board.  Lines 0 to 7 can only be set to
+ NI_660X_PFI_OUTPUT_DIO.  Lines 32 to 39 can only be set to
+ NI_660X_PFI_OUTPUT_COUNTER. */
+	enum ni_660x_pfi_routing {
+		NI_660X_PFI_OUTPUT_COUNTER = 1,	// counter
+		NI_660X_PFI_OUTPUT_DIO = 2,	// static digital output
+	};
+
+/* NI External Trigger lines.  These values are not arbitrary, but are related to
+	the bits required to program the board (offset by 1 for historical reasons). */
+	static inline unsigned NI_EXT_PFI(unsigned pfi_channel) {
+		return NI_USUAL_PFI_SELECT(pfi_channel) - 1;
+	}
+	static inline unsigned NI_EXT_RTSI(unsigned rtsi_channel) {
+		return NI_USUAL_RTSI_SELECT(rtsi_channel) - 1;
+	}
+
+/* status bits for INSN_CONFIG_GET_COUNTER_STATUS */
+	enum comedi_counter_status_flags {
+		COMEDI_COUNTER_ARMED = 0x1,
+		COMEDI_COUNTER_COUNTING = 0x2,
+		COMEDI_COUNTER_TERMINAL_COUNT = 0x4,
+	};
+
+/* Clock sources for CDIO subdevice on NI m-series boards.
+Used as the scan_begin_arg for a comedi_command. These
+sources may also be bitwise-or'd with CR_INVERT to change polarity. */
+	enum ni_m_series_cdio_scan_begin_src {
+		NI_CDIO_SCAN_BEGIN_SRC_GROUND = 0,
+		NI_CDIO_SCAN_BEGIN_SRC_AI_START = 18,
+		NI_CDIO_SCAN_BEGIN_SRC_AI_CONVERT = 19,
+		NI_CDIO_SCAN_BEGIN_SRC_PXI_STAR_TRIGGER = 20,
+		NI_CDIO_SCAN_BEGIN_SRC_G0_OUT = 28,
+		NI_CDIO_SCAN_BEGIN_SRC_G1_OUT = 29,
+		NI_CDIO_SCAN_BEGIN_SRC_ANALOG_TRIGGER = 30,
+		NI_CDIO_SCAN_BEGIN_SRC_AO_UPDATE = 31,
+		NI_CDIO_SCAN_BEGIN_SRC_FREQ_OUT = 32,
+		NI_CDIO_SCAN_BEGIN_SRC_DIO_CHANGE_DETECT_IRQ = 33
+	};
+	static inline unsigned NI_CDIO_SCAN_BEGIN_SRC_PFI(unsigned pfi_channel) {
+		return NI_USUAL_PFI_SELECT(pfi_channel);
+	}
+	static inline unsigned NI_CDIO_SCAN_BEGIN_SRC_RTSI(unsigned
+		rtsi_channel) {
+		return NI_USUAL_RTSI_SELECT(rtsi_channel);
+	}
+
+/* scan_begin_src for scan_begin_arg==TRIG_EXT with analog output command
+on NI boards.  These scan begin sources can also be bitwise-or'd with
+CR_INVERT to change polarity. */
+	static inline unsigned NI_AO_SCAN_BEGIN_SRC_PFI(unsigned pfi_channel) {
+		return NI_USUAL_PFI_SELECT(pfi_channel);
+	}
+	static inline unsigned NI_AO_SCAN_BEGIN_SRC_RTSI(unsigned rtsi_channel) {
+		return NI_USUAL_RTSI_SELECT(rtsi_channel);
+	}
+
+/* Bits for setting a clock source with
+ * INSN_CONFIG_SET_CLOCK_SRC when using NI frequency output subdevice. */
+	enum ni_freq_out_clock_source_bits {
+		NI_FREQ_OUT_TIMEBASE_1_DIV_2_CLOCK_SRC,	// 10 MHz
+		NI_FREQ_OUT_TIMEBASE_2_CLOCK_SRC	// 100 KHz
+	};
+
+/* Values for setting a clock source with INSN_CONFIG_SET_CLOCK_SRC for
+ * 8254 counter subdevices on Amplicon DIO boards (amplc_dio200 driver). */
+	enum amplc_dio_clock_source {
+		AMPLC_DIO_CLK_CLKN,	/* per channel external clock
+					   input/output pin (pin is only an
+					   input when clock source set to this
+					   value, otherwise it is an output) */
+		AMPLC_DIO_CLK_10MHZ,	/* 10 MHz internal clock */
+		AMPLC_DIO_CLK_1MHZ,	/* 1 MHz internal clock */
+		AMPLC_DIO_CLK_100KHZ,	/* 100 kHz internal clock */
+		AMPLC_DIO_CLK_10KHZ,	/* 10 kHz internal clock */
+		AMPLC_DIO_CLK_1KHZ,	/* 1 kHz internal clock */
+		AMPLC_DIO_CLK_OUTNM1,	/* output of preceding counter channel
+					   (for channel 0, preceding counter
+					   channel is channel 2 on preceding
+					   counter subdevice, for first counter
+					   subdevice, preceding counter
+					   subdevice is the last counter
+					   subdevice) */
+		AMPLC_DIO_CLK_EXT	/* per chip external input pin */
+	};
+
+/* Values for setting a gate source with INSN_CONFIG_SET_GATE_SRC for
+ * 8254 counter subdevices on Amplicon DIO boards (amplc_dio200 driver). */
+	enum amplc_dio_gate_source {
+		AMPLC_DIO_GAT_VCC,	/* internal high logic level */
+		AMPLC_DIO_GAT_GND,	/* internal low logic level */
+		AMPLC_DIO_GAT_GATN,	/* per channel external gate input */
+		AMPLC_DIO_GAT_NOUTNM2,	/* negated output of counter channel
+					   minus 2 (for channels 0 or 1,
+					   channel minus 2 is channel 1 or 2 on
+					   the preceding counter subdevice, for
+					   the first counter subdevice the
+					   preceding counter subdevice is the
+					   last counter subdevice) */
+		AMPLC_DIO_GAT_RESERVED4,
+		AMPLC_DIO_GAT_RESERVED5,
+		AMPLC_DIO_GAT_RESERVED6,
+		AMPLC_DIO_GAT_RESERVED7
+	};
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _COMEDI_H */
diff --git a/drivers/staging/comedi/comedi_compat32.c b/drivers/staging/comedi/comedi_compat32.c
new file mode 100644
index 0000000..7d0116b
--- /dev/null
+++ b/drivers/staging/comedi/comedi_compat32.c
@@ -0,0 +1,597 @@
+/*
+    comedi/comedi_compat32.c
+    32-bit ioctl compatibility for 64-bit comedi kernel module.
+
+    Author: Ian Abbott, MEV Ltd. <abbotti@mev.co.uk>
+    Copyright (C) 2007 MEV Ltd. <http://www.mev.co.uk/>
+
+    COMEDI - Linux Control and Measurement Device Interface
+    Copyright (C) 1997-2007 David A. Schleef <ds@schleef.org>
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+*/
+
+#define __NO_VERSION__
+#include "comedi.h"
+#include <linux/smp_lock.h>
+#include <asm/uaccess.h>
+
+#include "comedi_compat32.h"
+
+#ifdef CONFIG_COMPAT
+
+#ifndef HAVE_COMPAT_IOCTL
+#include <linux/ioctl32.h>	/* for (un)register_ioctl32_conversion */
+#endif
+
+#define COMEDI32_CHANINFO _IOR(CIO,3,comedi32_chaninfo)
+#define COMEDI32_RANGEINFO _IOR(CIO,8,comedi32_rangeinfo)
+/* N.B. COMEDI32_CMD and COMEDI_CMD ought to use _IOWR, not _IOR.
+ * It's too late to change it now, but it only affects the command number. */
+#define COMEDI32_CMD _IOR(CIO,9,comedi32_cmd)
+/* N.B. COMEDI32_CMDTEST and COMEDI_CMDTEST ought to use _IOWR, not _IOR.
+ * It's too late to change it now, but it only affects the command number. */
+#define COMEDI32_CMDTEST _IOR(CIO,10,comedi32_cmd)
+#define COMEDI32_INSNLIST _IOR(CIO,11,comedi32_insnlist)
+#define COMEDI32_INSN _IOR(CIO,12,comedi32_insn)
+
+typedef struct comedi32_chaninfo_struct {
+	unsigned int subdev;
+	compat_uptr_t maxdata_list;	/* 32-bit 'lsampl_t *' */
+	compat_uptr_t flaglist;		/* 32-bit 'unsigned int *' */
+	compat_uptr_t rangelist;	/* 32-bit 'unsigned int *' */
+	unsigned int unused[4];
+} comedi32_chaninfo;
+
+typedef struct comedi32_rangeinfo_struct {
+	unsigned int range_type;
+	compat_uptr_t range_ptr;	/* 32-bit 'void *' */
+} comedi32_rangeinfo;
+
+typedef struct comedi32_cmd_struct {
+	unsigned int subdev;
+	unsigned int flags;
+	unsigned int start_src;
+	unsigned int start_arg;
+	unsigned int scan_begin_src;
+	unsigned int scan_begin_arg;
+	unsigned int convert_src;
+	unsigned int convert_arg;
+	unsigned int scan_end_src;
+	unsigned int scan_end_arg;
+	unsigned int stop_src;
+	unsigned int stop_arg;
+	compat_uptr_t chanlist;		/* 32-bit 'unsigned int *' */
+	unsigned int chanlist_len;
+	compat_uptr_t data;		/* 32-bit 'sampl_t *' */
+	unsigned int data_len;
+} comedi32_cmd;
+
+typedef struct comedi32_insn_struct {
+	unsigned int insn;
+	unsigned int n;
+	compat_uptr_t data;		/* 32-bit 'lsampl_t *' */
+	unsigned int subdev;
+	unsigned int chanspec;
+	unsigned int unused[3];
+} comedi32_insn;
+
+typedef struct comedi32_insnlist_struct {
+	unsigned int n_insns;
+	compat_uptr_t insns;		/* 32-bit 'comedi_insn *' */
+} comedi32_insnlist;
+
+/* Handle translated ioctl. */
+static int translated_ioctl(struct file *file, unsigned int cmd,
+		unsigned long arg)
+{
+	if (!file->f_op) {
+		return -ENOTTY;
+	}
+#ifdef HAVE_UNLOCKED_IOCTL
+	if (file->f_op->unlocked_ioctl) {
+		int rc = (int)(*file->f_op->unlocked_ioctl)(file, cmd, arg);
+		if (rc == -ENOIOCTLCMD) {
+			rc = -ENOTTY;
+		}
+		return rc;
+	}
+#endif
+	if (file->f_op->ioctl) {
+		int rc;
+		lock_kernel();
+		rc = (*file->f_op->ioctl)(file->f_dentry->d_inode,
+				file, cmd, arg);
+		unlock_kernel();
+		return rc;
+	}
+	return -ENOTTY;
+}
+
+/* Handle 32-bit COMEDI_CHANINFO ioctl. */
+static int compat_chaninfo(struct file *file, unsigned long arg)
+{
+	comedi_chaninfo __user *chaninfo;
+	comedi32_chaninfo __user *chaninfo32;
+	int err;
+	union {
+		unsigned int uint;
+		compat_uptr_t uptr;
+	} temp;
+
+	chaninfo32 = compat_ptr(arg);
+	chaninfo = compat_alloc_user_space(sizeof(*chaninfo));
+
+	/* Copy chaninfo structure.  Ignore unused members. */
+	if (!access_ok(VERIFY_READ, chaninfo32, sizeof(*chaninfo32))
+			|| !access_ok(VERIFY_WRITE, chaninfo,
+				sizeof(*chaninfo))) {
+		return -EFAULT;
+	}
+	err = 0;
+	err |= __get_user(temp.uint, &chaninfo32->subdev);
+	err |= __put_user(temp.uint, &chaninfo->subdev);
+	err |= __get_user(temp.uptr, &chaninfo32->maxdata_list);
+	err |= __put_user(compat_ptr(temp.uptr), &chaninfo->maxdata_list);
+	err |= __get_user(temp.uptr, &chaninfo32->flaglist);
+	err |= __put_user(compat_ptr(temp.uptr), &chaninfo->flaglist);
+	err |= __get_user(temp.uptr, &chaninfo32->rangelist);
+	err |= __put_user(compat_ptr(temp.uptr), &chaninfo->rangelist);
+	if (err) {
+		return -EFAULT;
+	}
+
+	return translated_ioctl(file, COMEDI_CHANINFO, (unsigned long)chaninfo);
+}
+
+/* Handle 32-bit COMEDI_RANGEINFO ioctl. */
+static int compat_rangeinfo(struct file *file, unsigned long arg)
+{
+	comedi_rangeinfo __user *rangeinfo;
+	comedi32_rangeinfo __user *rangeinfo32;
+	int err;
+	union {
+		unsigned int uint;
+		compat_uptr_t uptr;
+	} temp;
+
+	rangeinfo32 = compat_ptr(arg);
+	rangeinfo = compat_alloc_user_space(sizeof(*rangeinfo));
+
+	/* Copy rangeinfo structure. */
+	if (!access_ok(VERIFY_READ, rangeinfo32, sizeof(*rangeinfo32))
+			|| !access_ok(VERIFY_WRITE, rangeinfo,
+				sizeof(*rangeinfo))) {
+		return -EFAULT;
+	}
+	err = 0;
+	err |= __get_user(temp.uint, &rangeinfo32->range_type);
+	err |= __put_user(temp.uint, &rangeinfo->range_type);
+	err |= __get_user(temp.uptr, &rangeinfo32->range_ptr);
+	err |= __put_user(compat_ptr(temp.uptr), &rangeinfo->range_ptr);
+	if (err) {
+		return -EFAULT;
+	}
+
+	return translated_ioctl(file, COMEDI_RANGEINFO,
+			(unsigned long)rangeinfo);
+}
+
+/* Copy 32-bit cmd structure to native cmd structure. */
+static int get_compat_cmd(comedi_cmd __user *cmd,
+		comedi32_cmd __user *cmd32)
+{
+	int err;
+	union {
+		unsigned int uint;
+		compat_uptr_t uptr;
+	} temp;
+
+	/* Copy cmd structure. */
+	if (!access_ok(VERIFY_READ, cmd32, sizeof(*cmd32))
+			|| !access_ok(VERIFY_WRITE, cmd, sizeof(*cmd))) {
+		return -EFAULT;
+	}
+	err = 0;
+	err |= __get_user(temp.uint, &cmd32->subdev);
+	err |= __put_user(temp.uint, &cmd->subdev);
+	err |= __get_user(temp.uint, &cmd32->flags);
+	err |= __put_user(temp.uint, &cmd->flags);
+	err |= __get_user(temp.uint, &cmd32->start_src);
+	err |= __put_user(temp.uint, &cmd->start_src);
+	err |= __get_user(temp.uint, &cmd32->start_arg);
+	err |= __put_user(temp.uint, &cmd->start_arg);
+	err |= __get_user(temp.uint, &cmd32->scan_begin_src);
+	err |= __put_user(temp.uint, &cmd->scan_begin_src);
+	err |= __get_user(temp.uint, &cmd32->scan_begin_arg);
+	err |= __put_user(temp.uint, &cmd->scan_begin_arg);
+	err |= __get_user(temp.uint, &cmd32->convert_src);
+	err |= __put_user(temp.uint, &cmd->convert_src);
+	err |= __get_user(temp.uint, &cmd32->convert_arg);
+	err |= __put_user(temp.uint, &cmd->convert_arg);
+	err |= __get_user(temp.uint, &cmd32->scan_end_src);
+	err |= __put_user(temp.uint, &cmd->scan_end_src);
+	err |= __get_user(temp.uint, &cmd32->scan_end_arg);
+	err |= __put_user(temp.uint, &cmd->scan_end_arg);
+	err |= __get_user(temp.uint, &cmd32->stop_src);
+	err |= __put_user(temp.uint, &cmd->stop_src);
+	err |= __get_user(temp.uint, &cmd32->stop_arg);
+	err |= __put_user(temp.uint, &cmd->stop_arg);
+	err |= __get_user(temp.uptr, &cmd32->chanlist);
+	err |= __put_user(compat_ptr(temp.uptr), &cmd->chanlist);
+	err |= __get_user(temp.uint, &cmd32->chanlist_len);
+	err |= __put_user(temp.uint, &cmd->chanlist_len);
+	err |= __get_user(temp.uptr, &cmd32->data);
+	err |= __put_user(compat_ptr(temp.uptr), &cmd->data);
+	err |= __get_user(temp.uint, &cmd32->data_len);
+	err |= __put_user(temp.uint, &cmd->data_len);
+	return err ? -EFAULT : 0;
+}
+
+/* Copy native cmd structure to 32-bit cmd structure. */
+static int put_compat_cmd(comedi32_cmd __user *cmd32, comedi_cmd __user *cmd)
+{
+	int err;
+	unsigned int temp;
+
+	/* Copy back most of cmd structure. */
+	/* Assume the pointer values are already valid. */
+	/* (Could use ptr_to_compat() to set them, but that wasn't implemented
+	 * until kernel version 2.6.11.) */
+	if (!access_ok(VERIFY_READ, cmd, sizeof(*cmd))
+			|| !access_ok(VERIFY_WRITE, cmd32, sizeof(*cmd32))) {
+		return -EFAULT;
+	}
+	err = 0;
+	err |= __get_user(temp, &cmd->subdev);
+	err |= __put_user(temp, &cmd32->subdev);
+	err |= __get_user(temp, &cmd->flags);
+	err |= __put_user(temp, &cmd32->flags);
+	err |= __get_user(temp, &cmd->start_src);
+	err |= __put_user(temp, &cmd32->start_src);
+	err |= __get_user(temp, &cmd->start_arg);
+	err |= __put_user(temp, &cmd32->start_arg);
+	err |= __get_user(temp, &cmd->scan_begin_src);
+	err |= __put_user(temp, &cmd32->scan_begin_src);
+	err |= __get_user(temp, &cmd->scan_begin_arg);
+	err |= __put_user(temp, &cmd32->scan_begin_arg);
+	err |= __get_user(temp, &cmd->convert_src);
+	err |= __put_user(temp, &cmd32->convert_src);
+	err |= __get_user(temp, &cmd->convert_arg);
+	err |= __put_user(temp, &cmd32->convert_arg);
+	err |= __get_user(temp, &cmd->scan_end_src);
+	err |= __put_user(temp, &cmd32->scan_end_src);
+	err |= __get_user(temp, &cmd->scan_end_arg);
+	err |= __put_user(temp, &cmd32->scan_end_arg);
+	err |= __get_user(temp, &cmd->stop_src);
+	err |= __put_user(temp, &cmd32->stop_src);
+	err |= __get_user(temp, &cmd->stop_arg);
+	err |= __put_user(temp, &cmd32->stop_arg);
+	/* Assume chanlist pointer is unchanged. */
+	err |= __get_user(temp, &cmd->chanlist_len);
+	err |= __put_user(temp, &cmd32->chanlist_len);
+	/* Assume data pointer is unchanged. */
+	err |= __get_user(temp, &cmd->data_len);
+	err |= __put_user(temp, &cmd32->data_len);
+	return err ? -EFAULT : 0;
+}
+
+/* Handle 32-bit COMEDI_CMD ioctl. */
+static int compat_cmd(struct file *file, unsigned long arg)
+{
+	comedi_cmd __user *cmd;
+	comedi32_cmd __user *cmd32;
+	int rc;
+
+	cmd32 = compat_ptr(arg);
+	cmd = compat_alloc_user_space(sizeof(*cmd));
+
+	rc = get_compat_cmd(cmd, cmd32);
+	if (rc) {
+		return rc;
+	}
+
+	return translated_ioctl(file, COMEDI_CMD, (unsigned long)cmd);
+}
+
+/* Handle 32-bit COMEDI_CMDTEST ioctl. */
+static int compat_cmdtest(struct file *file, unsigned long arg)
+{
+	comedi_cmd __user *cmd;
+	comedi32_cmd __user *cmd32;
+	int rc, err;
+
+	cmd32 = compat_ptr(arg);
+	cmd = compat_alloc_user_space(sizeof(*cmd));
+
+	rc = get_compat_cmd(cmd, cmd32);
+	if (rc) {
+		return rc;
+	}
+
+	rc = translated_ioctl(file, COMEDI_CMDTEST, (unsigned long)cmd);
+	if (rc < 0) {
+		return rc;
+	}
+
+	err = put_compat_cmd(cmd32, cmd);
+	if (err) {
+		rc = err;
+	}
+	return rc;
+}
+
+/* Copy 32-bit insn structure to native insn structure. */
+static int get_compat_insn(comedi_insn __user *insn,
+		comedi32_insn __user *insn32)
+{
+	int err;
+	union {
+		unsigned int uint;
+		compat_uptr_t uptr;
+	} temp;
+
+	/* Copy insn structure.  Ignore the unused members. */
+	err = 0;
+	if (!access_ok(VERIFY_READ, insn32, sizeof(*insn32))
+			|| !access_ok(VERIFY_WRITE, insn, sizeof(*insn))) {
+		return -EFAULT;
+	}
+	err |= __get_user(temp.uint, &insn32->insn);
+	err |= __put_user(temp.uint, &insn->insn);
+	err |= __get_user(temp.uint, &insn32->n);
+	err |= __put_user(temp.uint, &insn->n);
+	err |= __get_user(temp.uptr, &insn32->data);
+	err |= __put_user(compat_ptr(temp.uptr), &insn->data);
+	err |= __get_user(temp.uint, &insn32->subdev);
+	err |= __put_user(temp.uint, &insn->subdev);
+	err |= __get_user(temp.uint, &insn32->chanspec);
+	err |= __put_user(temp.uint, &insn->chanspec);
+	return err ? -EFAULT : 0;
+}
+
+/* Handle 32-bit COMEDI_INSNLIST ioctl. */
+static int compat_insnlist(struct file *file, unsigned long arg)
+{
+	struct combined_insnlist {
+		comedi_insnlist insnlist;
+		comedi_insn insn[1];
+	} __user *s;
+	comedi32_insnlist __user *insnlist32;
+	comedi32_insn __user *insn32;
+	compat_uptr_t uptr;
+	unsigned int n_insns, n;
+	int err, rc;
+
+	insnlist32 = compat_ptr(arg);
+
+	/* Get 32-bit insnlist structure.  */
+	if (!access_ok(VERIFY_READ, insnlist32, sizeof(*insnlist32))) {
+		return -EFAULT;
+	}
+	err = 0;
+	err |= __get_user(n_insns, &insnlist32->n_insns);
+	err |= __get_user(uptr, &insnlist32->insns);
+	insn32 = compat_ptr(uptr);
+	if (err) {
+		return -EFAULT;
+	}
+
+	/* Allocate user memory to copy insnlist and insns into. */
+	s = compat_alloc_user_space(offsetof(struct combined_insnlist,
+				insn[n_insns]));
+
+	/* Set native insnlist structure. */
+	if (!access_ok(VERIFY_WRITE, &s->insnlist, sizeof(s->insnlist))) {
+		return -EFAULT;
+	}
+	err |= __put_user(n_insns, &s->insnlist.n_insns);
+	err |= __put_user(&s->insn[0], &s->insnlist.insns);
+	if (err) {
+		return -EFAULT;
+	}
+
+	/* Copy insn structures. */
+	for (n = 0; n < n_insns; n++) {
+		rc = get_compat_insn(&s->insn[n], &insn32[n]);
+		if (rc) {
+			return rc;
+		}
+	}
+
+	return translated_ioctl(file, COMEDI_INSNLIST,
+			(unsigned long)&s->insnlist);
+}
+
+/* Handle 32-bit COMEDI_INSN ioctl. */
+static int compat_insn(struct file *file, unsigned long arg)
+{
+	comedi_insn __user *insn;
+	comedi32_insn __user *insn32;
+	int rc;
+
+	insn32 = compat_ptr(arg);
+	insn = compat_alloc_user_space(sizeof(*insn));
+
+	rc = get_compat_insn(insn, insn32);
+	if (rc) {
+		return rc;
+	}
+
+	return translated_ioctl(file, COMEDI_INSN, (unsigned long)insn);
+}
+
+/* Process untranslated ioctl. */
+/* Returns -ENOIOCTLCMD for unrecognised ioctl codes. */
+static inline int raw_ioctl(struct file *file, unsigned int cmd,
+		unsigned long arg)
+{
+	int rc;
+
+	switch (cmd) {
+	case COMEDI_DEVCONFIG:
+	case COMEDI_DEVINFO:
+	case COMEDI_SUBDINFO:
+	case COMEDI_BUFCONFIG:
+	case COMEDI_BUFINFO:
+		/* Just need to translate the pointer argument. */
+		arg = (unsigned long)compat_ptr(arg);
+		rc = translated_ioctl(file, cmd, arg);
+		break;
+	case COMEDI_LOCK:
+	case COMEDI_UNLOCK:
+	case COMEDI_CANCEL:
+	case COMEDI_POLL:
+		/* No translation needed. */
+		rc = translated_ioctl(file, cmd, arg);
+		break;
+	case COMEDI32_CHANINFO:
+		rc = compat_chaninfo(file, arg);
+		break;
+	case COMEDI32_RANGEINFO:
+		rc = compat_rangeinfo(file, arg);
+		break;
+	case COMEDI32_CMD:
+		rc = compat_cmd(file, arg);
+		break;
+	case COMEDI32_CMDTEST:
+		rc = compat_cmdtest(file, arg);
+		break;
+	case COMEDI32_INSNLIST:
+		rc = compat_insnlist(file, arg);
+		break;
+	case COMEDI32_INSN:
+		rc = compat_insn(file, arg);
+		break;
+	default:
+		rc = -ENOIOCTLCMD;
+		break;
+	}
+	return rc;
+}
+
+#ifdef HAVE_COMPAT_IOCTL	/* defined in <linux/fs.h> 2.6.11 onwards */
+
+/* compat_ioctl file operation. */
+/* Returns -ENOIOCTLCMD for unrecognised ioctl codes. */
+long comedi_compat_ioctl(struct file *file, unsigned int cmd,
+		unsigned long arg)
+{
+	return raw_ioctl(file, cmd, arg);
+}
+
+#else /* HAVE_COMPAT_IOCTL */
+
+/*
+ * Brain-dead ioctl compatibility for 2.6.10 and earlier.
+ *
+ * It's brain-dead because cmd numbers need to be unique system-wide!
+ * The comedi driver could end up attempting to execute ioctls for non-Comedi
+ * devices because it registered the system-wide cmd code first.  Similarly,
+ * another driver could end up attempting to execute ioctls for a Comedi
+ * device because it registered the cmd code first.  Chaos ensues.
+ */
+
+/* Handler for all 32-bit ioctl codes registered by this driver. */
+static int mapped_ioctl(unsigned int fd, unsigned int cmd, unsigned long arg,
+		struct file *file)
+{
+	int rc;
+
+	/* Make sure we are dealing with a Comedi device. */
+	if (imajor(file->f_dentry->d_inode) != COMEDI_MAJOR) {
+		return -ENOTTY;
+	}
+	rc = raw_ioctl(file, cmd, arg);
+	/* Do not return -ENOIOCTLCMD. */
+	if (rc == -ENOIOCTLCMD) {
+		rc = -ENOTTY;
+	}
+	return rc;
+}
+
+struct ioctl32_map {
+	unsigned int cmd;
+	int (*handler)(unsigned int, unsigned int, unsigned long,
+			struct file *);
+	int registered;
+};
+
+static struct ioctl32_map comedi_ioctl32_map[] = {
+	{ COMEDI_DEVCONFIG, mapped_ioctl, 0 },
+	{ COMEDI_DEVINFO, mapped_ioctl, 0 },
+	{ COMEDI_SUBDINFO, mapped_ioctl, 0 },
+	{ COMEDI_BUFCONFIG, mapped_ioctl, 0 },
+	{ COMEDI_BUFINFO, mapped_ioctl, 0 },
+	{ COMEDI_LOCK, mapped_ioctl, 0 },
+	{ COMEDI_UNLOCK, mapped_ioctl, 0 },
+	{ COMEDI_CANCEL, mapped_ioctl, 0 },
+	{ COMEDI_POLL, mapped_ioctl, 0 },
+	{ COMEDI32_CHANINFO, mapped_ioctl, 0 },
+	{ COMEDI32_RANGEINFO, mapped_ioctl, 0 },
+	{ COMEDI32_CMD, mapped_ioctl, 0 },
+	{ COMEDI32_CMDTEST, mapped_ioctl, 0 },
+	{ COMEDI32_INSNLIST, mapped_ioctl, 0 },
+	{ COMEDI32_INSN, mapped_ioctl, 0 },
+};
+
+#define NUM_IOCTL32_MAPS ARRAY_SIZE(comedi_ioctl32_map)
+
+/* Register system-wide 32-bit ioctl handlers. */
+void comedi_register_ioctl32(void)
+{
+	int n, rc;
+
+	for (n = 0; n < NUM_IOCTL32_MAPS; n++) {
+		rc = register_ioctl32_conversion(comedi_ioctl32_map[n].cmd,
+				comedi_ioctl32_map[n].handler);
+		if (rc) {
+			printk(KERN_WARNING
+					"comedi: failed to register 32-bit "
+					"compatible ioctl handler for 0x%X - "
+					"expect bad things to happen!\n",
+					comedi_ioctl32_map[n].cmd);
+		}
+		comedi_ioctl32_map[n].registered = !rc;
+	}
+}
+
+/* Unregister system-wide 32-bit ioctl translations. */
+void comedi_unregister_ioctl32(void)
+{
+	int n, rc;
+
+	for (n = 0; n < NUM_IOCTL32_MAPS; n++) {
+		if (comedi_ioctl32_map[n].registered) {
+			rc = unregister_ioctl32_conversion(
+					comedi_ioctl32_map[n].cmd,
+					comedi_ioctl32_map[n].handler);
+			if (rc) {
+				printk(KERN_ERR
+					"comedi: failed to unregister 32-bit "
+					"compatible ioctl handler for 0x%X - "
+					"expect kernel Oops!\n",
+					comedi_ioctl32_map[n].cmd);
+			} else {
+				comedi_ioctl32_map[n].registered = 0;
+			}
+		}
+	}
+}
+
+#endif	/* HAVE_COMPAT_IOCTL */
+
+#endif	/* CONFIG_COMPAT */
diff --git a/drivers/staging/comedi/comedi_compat32.h b/drivers/staging/comedi/comedi_compat32.h
new file mode 100644
index 0000000..198aea5
--- /dev/null
+++ b/drivers/staging/comedi/comedi_compat32.h
@@ -0,0 +1,58 @@
+/*
+    comedi/comedi_compat32.h
+    32-bit ioctl compatibility for 64-bit comedi kernel module.
+
+    Author: Ian Abbott, MEV Ltd. <abbotti@mev.co.uk>
+    Copyright (C) 2007 MEV Ltd. <http://www.mev.co.uk/>
+
+    COMEDI - Linux Control and Measurement Device Interface
+    Copyright (C) 1997-2007 David A. Schleef <ds@schleef.org>
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+*/
+
+#ifndef _COMEDI_COMPAT32_H
+#define _COMEDI_COMPAT32_H
+
+#include <linux/compat.h>
+#include <linux/fs.h>	/* For HAVE_COMPAT_IOCTL and HAVE_UNLOCKED_IOCTL */
+
+#ifdef CONFIG_COMPAT
+
+#ifdef HAVE_COMPAT_IOCTL
+
+extern long comedi_compat_ioctl(struct file *file, unsigned int cmd,
+		unsigned long arg);
+#define comedi_register_ioctl32() do{}while(0)
+#define comedi_unregister_ioctl32() do{}while(0)
+
+#else /* HAVE_COMPAT_IOCTL */
+
+#define comedi_compat_ioctl 0	/* NULL */
+extern void comedi_register_ioctl32(void);
+extern void comedi_unregister_ioctl32(void);
+
+#endif /* HAVE_COMPAT_IOCTL */
+
+#else /* CONFIG_COMPAT */
+
+#define comedi_compat_ioctl 0	/* NULL */
+#define comedi_register_ioctl32() do{}while(0)
+#define comedi_unregister_ioctl32() do{}while(0)
+
+#endif /* CONFIG_COMPAT */
+
+#endif /* _COMEDI_COMPAT32_H */
diff --git a/drivers/staging/comedi/comedi_fops.c b/drivers/staging/comedi/comedi_fops.c
new file mode 100644
index 0000000..f445664
--- /dev/null
+++ b/drivers/staging/comedi/comedi_fops.c
@@ -0,0 +1,2246 @@
+/*
+    comedi/comedi_fops.c
+    comedi kernel module
+
+    COMEDI - Linux Control and Measurement Device Interface
+    Copyright (C) 1997-2000 David A. Schleef <ds@schleef.org>
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+*/
+
+#undef DEBUG
+
+#define __NO_VERSION__
+#include "comedi_fops.h"
+#include "comedi_compat32.h"
+
+#include <linux/module.h>
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/fcntl.h>
+#include <linux/delay.h>
+#include <linux/ioport.h>
+#include <linux/mm.h>
+#include <linux/slab.h>
+#include <linux/kmod.h>
+#include <linux/poll.h>
+#include <linux/init.h>
+#include <linux/device.h>
+#include <linux/vmalloc.h>
+#include <linux/fs.h>
+#include "comedidev.h"
+#include <linux/cdev.h>
+
+#include <asm/io.h>
+#include <asm/uaccess.h>
+
+//#include "kvmem.h"
+
+MODULE_AUTHOR("http://www.comedi.org");
+MODULE_DESCRIPTION("Comedi core module");
+MODULE_LICENSE("GPL");
+
+#ifdef CONFIG_COMEDI_DEBUG
+int comedi_debug;
+module_param(comedi_debug, int, 0644);
+#endif
+
+static DEFINE_SPINLOCK(comedi_file_info_table_lock);
+static struct comedi_device_file_info* comedi_file_info_table[COMEDI_NUM_MINORS];
+
+static int do_devconfig_ioctl(comedi_device * dev, comedi_devconfig * arg);
+static int do_bufconfig_ioctl(comedi_device * dev, void *arg);
+static int do_devinfo_ioctl(comedi_device * dev, comedi_devinfo * arg,
+	struct file *file);
+static int do_subdinfo_ioctl(comedi_device * dev, comedi_subdinfo * arg,
+	void *file);
+static int do_chaninfo_ioctl(comedi_device * dev, comedi_chaninfo * arg);
+static int do_bufinfo_ioctl(comedi_device * dev, void *arg);
+static int do_cmd_ioctl(comedi_device * dev, void *arg, void *file);
+static int do_lock_ioctl(comedi_device * dev, unsigned int arg, void *file);
+static int do_unlock_ioctl(comedi_device * dev, unsigned int arg, void *file);
+static int do_cancel_ioctl(comedi_device * dev, unsigned int arg, void *file);
+static int do_cmdtest_ioctl(comedi_device * dev, void *arg, void *file);
+static int do_insnlist_ioctl(comedi_device * dev, void *arg, void *file);
+static int do_insn_ioctl(comedi_device * dev, void *arg, void *file);
+static int do_poll_ioctl(comedi_device * dev, unsigned int subd, void *file);
+
+void do_become_nonbusy(comedi_device * dev, comedi_subdevice * s);
+static int do_cancel(comedi_device * dev, comedi_subdevice * s);
+
+static int comedi_fasync(int fd, struct file *file, int on);
+
+static int is_device_busy(comedi_device * dev);
+
+#ifdef HAVE_UNLOCKED_IOCTL
+static long comedi_unlocked_ioctl(struct file *file, unsigned int cmd,
+	unsigned long arg)
+#else
+static int comedi_ioctl(struct inode *inode, struct file *file,
+	unsigned int cmd, unsigned long arg)
+#endif
+{
+	const unsigned minor = iminor(file->f_dentry->d_inode);
+	struct comedi_device_file_info *dev_file_info = comedi_get_device_file_info(minor);
+	comedi_device *dev = dev_file_info->device;
+	int rc;
+
+	mutex_lock(&dev->mutex);
+
+	/* Device config is special, because it must work on
+	 * an unconfigured device. */
+	if (cmd == COMEDI_DEVCONFIG) {
+		rc = do_devconfig_ioctl(dev, (void *)arg);
+		goto done;
+	}
+
+	if (!dev->attached) {
+		DPRINTK("no driver configured on /dev/comedi%i\n", dev->minor);
+		rc = -ENODEV;
+		goto done;
+	}
+
+	switch (cmd) {
+	case COMEDI_BUFCONFIG:
+		rc = do_bufconfig_ioctl(dev, (void *)arg);
+		break;
+	case COMEDI_DEVINFO:
+		rc = do_devinfo_ioctl(dev, (void *)arg, file);
+		break;
+	case COMEDI_SUBDINFO:
+		rc = do_subdinfo_ioctl(dev, (void *)arg, file);
+		break;
+	case COMEDI_CHANINFO:
+		rc = do_chaninfo_ioctl(dev, (void *)arg);
+		break;
+	case COMEDI_RANGEINFO:
+		rc = do_rangeinfo_ioctl(dev, (void *)arg);
+		break;
+	case COMEDI_BUFINFO:
+		rc = do_bufinfo_ioctl(dev, (void *)arg);
+		break;
+	case COMEDI_LOCK:
+		rc = do_lock_ioctl(dev, arg, file);
+		break;
+	case COMEDI_UNLOCK:
+		rc = do_unlock_ioctl(dev, arg, file);
+		break;
+	case COMEDI_CANCEL:
+		rc = do_cancel_ioctl(dev, arg, file);
+		break;
+	case COMEDI_CMD:
+		rc = do_cmd_ioctl(dev, (void *)arg, file);
+		break;
+	case COMEDI_CMDTEST:
+		rc = do_cmdtest_ioctl(dev, (void *)arg, file);
+		break;
+	case COMEDI_INSNLIST:
+		rc = do_insnlist_ioctl(dev, (void *)arg, file);
+		break;
+	case COMEDI_INSN:
+		rc = do_insn_ioctl(dev, (void *)arg, file);
+		break;
+	case COMEDI_POLL:
+		rc = do_poll_ioctl(dev, arg, file);
+		break;
+	default:
+		rc = -ENOTTY;
+		break;
+	}
+
+      done:
+	mutex_unlock(&dev->mutex);
+	return rc;
+}
+
+/*
+	COMEDI_DEVCONFIG
+	device config ioctl
+
+	arg:
+		pointer to devconfig structure
+
+	reads:
+		devconfig structure at arg
+
+	writes:
+		none
+*/
+static int do_devconfig_ioctl(comedi_device * dev, comedi_devconfig * arg)
+{
+	comedi_devconfig it;
+	int ret;
+	unsigned char *aux_data = NULL;
+	int aux_len;
+
+	if (!capable(CAP_SYS_ADMIN))
+		return -EPERM;
+
+	if (arg == NULL) {
+		if (is_device_busy(dev))
+			return -EBUSY;
+		if(dev->attached)
+		{
+			struct module *driver_module = dev->driver->module;
+			comedi_device_detach(dev);
+			module_put(driver_module);
+		}
+		return 0;
+	}
+
+	if (copy_from_user(&it, arg, sizeof(comedi_devconfig)))
+		return -EFAULT;
+
+	it.board_name[COMEDI_NAMELEN - 1] = 0;
+
+	if (comedi_aux_data(it.options, 0) &&
+		it.options[COMEDI_DEVCONF_AUX_DATA_LENGTH]) {
+		int bit_shift;
+		aux_len = it.options[COMEDI_DEVCONF_AUX_DATA_LENGTH];
+		if (aux_len < 0)
+			return -EFAULT;
+
+		aux_data = vmalloc(aux_len);
+		if (!aux_data)
+			return -ENOMEM;
+
+		if (copy_from_user(aux_data,
+				comedi_aux_data(it.options, 0), aux_len)) {
+			vfree(aux_data);
+			return -EFAULT;
+		}
+		it.options[COMEDI_DEVCONF_AUX_DATA_LO] =
+			(unsigned long)aux_data;
+		if (sizeof(void *) > sizeof(int)) {
+			bit_shift = sizeof(int) * 8;
+			it.options[COMEDI_DEVCONF_AUX_DATA_HI] =
+				((unsigned long)aux_data) >> bit_shift;
+		} else
+			it.options[COMEDI_DEVCONF_AUX_DATA_HI] = 0;
+	}
+
+	ret = comedi_device_attach(dev, &it);
+	if(ret == 0)
+	{
+		if(!try_module_get(dev->driver->module)) {
+			comedi_device_detach(dev);
+			return -ENOSYS;
+		}
+	}
+
+	if (aux_data)
+		vfree(aux_data);
+
+	return ret;
+}
+
+/*
+	COMEDI_BUFCONFIG
+	buffer configuration ioctl
+
+	arg:
+		pointer to bufconfig structure
+
+	reads:
+		bufconfig at arg
+
+	writes:
+		modified bufconfig at arg
+
+*/
+static int do_bufconfig_ioctl(comedi_device * dev, void *arg)
+{
+	comedi_bufconfig bc;
+	comedi_async *async;
+	comedi_subdevice *s;
+	int ret = 0;
+
+	if (copy_from_user(&bc, arg, sizeof(comedi_bufconfig)))
+		return -EFAULT;
+
+	if (bc.subdevice >= dev->n_subdevices || bc.subdevice < 0)
+		return -EINVAL;
+
+	s = dev->subdevices + bc.subdevice;
+	async = s->async;
+
+	if (!async) {
+		DPRINTK("subdevice does not have async capability\n");
+		bc.size = 0;
+		bc.maximum_size = 0;
+		goto copyback;
+	}
+
+	if (bc.maximum_size) {
+		if (!capable(CAP_SYS_ADMIN))
+			return -EPERM;
+
+		async->max_bufsize = bc.maximum_size;
+	}
+
+	if (bc.size) {
+		if (bc.size > async->max_bufsize)
+			return -EPERM;
+
+		if (s->busy) {
+			DPRINTK("subdevice is busy, cannot resize buffer\n");
+			return -EBUSY;
+		}
+		if (async->mmap_count) {
+			DPRINTK("subdevice is mmapped, cannot resize buffer\n");
+			return -EBUSY;
+		}
+
+		if (!async->prealloc_buf)
+			return -EINVAL;
+
+		/* make sure buffer is an integral number of pages
+		 * (we round up) */
+		bc.size = (bc.size + PAGE_SIZE - 1) & PAGE_MASK;
+
+		ret = comedi_buf_alloc(dev, s, bc.size);
+		if (ret < 0)
+			return ret;
+
+		if (s->buf_change) {
+			ret = s->buf_change(dev, s, bc.size);
+			if (ret < 0)
+				return ret;
+		}
+
+		DPRINTK("comedi%i subd %d buffer resized to %i bytes\n",
+			dev->minor, bc.subdevice, async->prealloc_bufsz);
+	}
+
+	bc.size = async->prealloc_bufsz;
+	bc.maximum_size = async->max_bufsize;
+
+      copyback:
+	if (copy_to_user(arg, &bc, sizeof(comedi_bufconfig)))
+		return -EFAULT;
+
+	return 0;
+}
+
+/*
+	COMEDI_DEVINFO
+	device info ioctl
+
+	arg:
+		pointer to devinfo structure
+
+	reads:
+		none
+
+	writes:
+		devinfo structure
+
+*/
+static int do_devinfo_ioctl(comedi_device * dev, comedi_devinfo * arg,
+	struct file *file)
+{
+	comedi_devinfo devinfo;
+	const unsigned minor = iminor(file->f_dentry->d_inode);
+	struct comedi_device_file_info *dev_file_info = comedi_get_device_file_info(minor);
+	comedi_subdevice *read_subdev = comedi_get_read_subdevice(dev_file_info);
+	comedi_subdevice *write_subdev = comedi_get_write_subdevice(dev_file_info);
+
+	memset(&devinfo, 0, sizeof(devinfo));
+
+	/* fill devinfo structure */
+	devinfo.version_code = COMEDI_VERSION_CODE;
+	devinfo.n_subdevs = dev->n_subdevices;
+	memcpy(devinfo.driver_name, dev->driver->driver_name, COMEDI_NAMELEN);
+	memcpy(devinfo.board_name, dev->board_name, COMEDI_NAMELEN);
+
+	if (read_subdev) {
+		devinfo.read_subdevice = read_subdev - dev->subdevices;
+	} else {
+		devinfo.read_subdevice = -1;
+	}
+	if (write_subdev) {
+		devinfo.write_subdevice = write_subdev - dev->subdevices;
+	} else {
+		devinfo.write_subdevice = -1;
+	}
+
+	if (copy_to_user(arg, &devinfo, sizeof(comedi_devinfo)))
+		return -EFAULT;
+
+	return 0;
+}
+
+/*
+	COMEDI_SUBDINFO
+	subdevice info ioctl
+
+	arg:
+		pointer to array of subdevice info structures
+
+	reads:
+		none
+
+	writes:
+		array of subdevice info structures at arg
+
+*/
+static int do_subdinfo_ioctl(comedi_device * dev, comedi_subdinfo * arg,
+	void *file)
+{
+	int ret, i;
+	comedi_subdinfo *tmp, *us;
+	comedi_subdevice *s;
+
+	tmp = kcalloc(dev->n_subdevices, sizeof(comedi_subdinfo), GFP_KERNEL);
+	if (!tmp)
+		return -ENOMEM;
+
+	/* fill subdinfo structs */
+	for (i = 0; i < dev->n_subdevices; i++) {
+		s = dev->subdevices + i;
+		us = tmp + i;
+
+		us->type = s->type;
+		us->n_chan = s->n_chan;
+		us->subd_flags = s->subdev_flags;
+		if (comedi_get_subdevice_runflags(s) & SRF_RUNNING)
+			us->subd_flags |= SDF_RUNNING;
+#define TIMER_nanosec 5		/* backwards compatibility */
+		us->timer_type = TIMER_nanosec;
+		us->len_chanlist = s->len_chanlist;
+		us->maxdata = s->maxdata;
+		if (s->range_table) {
+			us->range_type =
+				(i << 24) | (0 << 16) | (s->
+				range_table->length);
+		} else {
+			us->range_type = 0;	/* XXX */
+		}
+		us->flags = s->flags;
+
+		if (s->busy)
+			us->subd_flags |= SDF_BUSY;
+		if (s->busy == file)
+			us->subd_flags |= SDF_BUSY_OWNER;
+		if (s->lock)
+			us->subd_flags |= SDF_LOCKED;
+		if (s->lock == file)
+			us->subd_flags |= SDF_LOCK_OWNER;
+		if (!s->maxdata && s->maxdata_list)
+			us->subd_flags |= SDF_MAXDATA;
+		if (s->flaglist)
+			us->subd_flags |= SDF_FLAGS;
+		if (s->range_table_list)
+			us->subd_flags |= SDF_RANGETYPE;
+		if (s->do_cmd)
+			us->subd_flags |= SDF_CMD;
+
+		if (s->insn_bits != &insn_inval)
+			us->insn_bits_support = COMEDI_SUPPORTED;
+		else
+			us->insn_bits_support = COMEDI_UNSUPPORTED;
+
+		us->settling_time_0 = s->settling_time_0;
+	}
+
+	ret = copy_to_user(arg, tmp,
+		dev->n_subdevices * sizeof(comedi_subdinfo));
+
+	kfree(tmp);
+
+	return ret ? -EFAULT : 0;
+}
+
+/*
+	COMEDI_CHANINFO
+	subdevice info ioctl
+
+	arg:
+		pointer to chaninfo structure
+
+	reads:
+		chaninfo structure at arg
+
+	writes:
+		arrays at elements of chaninfo structure
+
+*/
+static int do_chaninfo_ioctl(comedi_device * dev, comedi_chaninfo * arg)
+{
+	comedi_subdevice *s;
+	comedi_chaninfo it;
+
+	if (copy_from_user(&it, arg, sizeof(comedi_chaninfo)))
+		return -EFAULT;
+
+	if (it.subdev >= dev->n_subdevices)
+		return -EINVAL;
+	s = dev->subdevices + it.subdev;
+
+	if (it.maxdata_list) {
+		if (s->maxdata || !s->maxdata_list)
+			return -EINVAL;
+		if (copy_to_user(it.maxdata_list, s->maxdata_list,
+				s->n_chan * sizeof(lsampl_t)))
+			return -EFAULT;
+	}
+
+	if (it.flaglist) {
+		if (!s->flaglist)
+			return -EINVAL;
+		if (copy_to_user(it.flaglist, s->flaglist,
+				s->n_chan * sizeof(unsigned int)))
+			return -EFAULT;
+	}
+
+	if (it.rangelist) {
+		int i;
+
+		if (!s->range_table_list)
+			return -EINVAL;
+		for (i = 0; i < s->n_chan; i++) {
+			int x;
+
+			x = (dev->minor << 28) | (it.subdev << 24) | (i << 16) |
+				(s->range_table_list[i]->length);
+			put_user(x, it.rangelist + i);
+		}
+		//if(copy_to_user(it.rangelist,s->range_type_list,s->n_chan*sizeof(unsigned int)))
+		//      return -EFAULT;
+	}
+
+	return 0;
+}
+
+ /*
+    COMEDI_BUFINFO
+    buffer information ioctl
+
+    arg:
+    pointer to bufinfo structure
+
+    reads:
+    bufinfo at arg
+
+    writes:
+    modified bufinfo at arg
+
+  */
+static int do_bufinfo_ioctl(comedi_device * dev, void *arg)
+{
+	comedi_bufinfo bi;
+	comedi_subdevice *s;
+	comedi_async *async;
+
+	if (copy_from_user(&bi, arg, sizeof(comedi_bufinfo)))
+		return -EFAULT;
+
+	if (bi.subdevice >= dev->n_subdevices || bi.subdevice < 0)
+		return -EINVAL;
+
+	s = dev->subdevices + bi.subdevice;
+	async = s->async;
+
+	if (!async) {
+		DPRINTK("subdevice does not have async capability\n");
+		bi.buf_write_ptr = 0;
+		bi.buf_read_ptr = 0;
+		bi.buf_write_count = 0;
+		bi.buf_read_count = 0;
+		goto copyback;
+	}
+
+	if (bi.bytes_read && (s->subdev_flags & SDF_CMD_READ)) {
+		bi.bytes_read = comedi_buf_read_alloc(async, bi.bytes_read);
+		comedi_buf_read_free(async, bi.bytes_read);
+
+		if (!(comedi_get_subdevice_runflags(s) & (SRF_ERROR |
+					SRF_RUNNING))
+			&& async->buf_write_count == async->buf_read_count) {
+			do_become_nonbusy(dev, s);
+		}
+	}
+
+	if (bi.bytes_written && (s->subdev_flags & SDF_CMD_WRITE)) {
+		bi.bytes_written =
+			comedi_buf_write_alloc(async, bi.bytes_written);
+		comedi_buf_write_free(async, bi.bytes_written);
+	}
+
+	bi.buf_write_count = async->buf_write_count;
+	bi.buf_write_ptr = async->buf_write_ptr;
+	bi.buf_read_count = async->buf_read_count;
+	bi.buf_read_ptr = async->buf_read_ptr;
+
+      copyback:
+	if (copy_to_user(arg, &bi, sizeof(comedi_bufinfo)))
+		return -EFAULT;
+
+	return 0;
+}
+
+static int parse_insn(comedi_device * dev, comedi_insn * insn, lsampl_t * data,
+	void *file);
+/*
+ * 	COMEDI_INSNLIST
+ * 	synchronous instructions
+ *
+ * 	arg:
+ * 		pointer to sync cmd structure
+ *
+ * 	reads:
+ * 		sync cmd struct at arg
+ * 		instruction list
+ * 		data (for writes)
+ *
+ * 	writes:
+ * 		data (for reads)
+ */
+/* arbitrary limits */
+#define MAX_SAMPLES 256
+static int do_insnlist_ioctl(comedi_device * dev, void *arg, void *file)
+{
+	comedi_insnlist insnlist;
+	comedi_insn *insns = NULL;
+	lsampl_t *data = NULL;
+	int i = 0;
+	int ret = 0;
+
+	if (copy_from_user(&insnlist, arg, sizeof(comedi_insnlist)))
+		return -EFAULT;
+
+	data = kmalloc(sizeof(lsampl_t) * MAX_SAMPLES, GFP_KERNEL);
+	if (!data) {
+		DPRINTK("kmalloc failed\n");
+		ret = -ENOMEM;
+		goto error;
+	}
+
+	insns = kmalloc(sizeof(comedi_insn) * insnlist.n_insns, GFP_KERNEL);
+	if (!insns) {
+		DPRINTK("kmalloc failed\n");
+		ret = -ENOMEM;
+		goto error;
+	}
+
+	if (copy_from_user(insns, insnlist.insns,
+			sizeof(comedi_insn) * insnlist.n_insns)) {
+		DPRINTK("copy_from_user failed\n");
+		ret = -EFAULT;
+		goto error;
+	}
+
+	for (i = 0; i < insnlist.n_insns; i++) {
+		if (insns[i].n > MAX_SAMPLES) {
+			DPRINTK("number of samples too large\n");
+			ret = -EINVAL;
+			goto error;
+		}
+		if (insns[i].insn & INSN_MASK_WRITE) {
+			if (copy_from_user(data, insns[i].data,
+					insns[i].n * sizeof(lsampl_t))) {
+				DPRINTK("copy_from_user failed\n");
+				ret = -EFAULT;
+				goto error;
+			}
+		}
+		ret = parse_insn(dev, insns + i, data, file);
+		if (ret < 0)
+			goto error;
+		if (insns[i].insn & INSN_MASK_READ) {
+			if (copy_to_user(insns[i].data, data,
+					insns[i].n * sizeof(lsampl_t))) {
+				DPRINTK("copy_to_user failed\n");
+				ret = -EFAULT;
+				goto error;
+			}
+		}
+		if (need_resched())
+			schedule();
+	}
+
+      error:
+	if (insns)
+		kfree(insns);
+	if (data)
+		kfree(data);
+
+	if (ret < 0)
+		return ret;
+	return i;
+}
+
+static int check_insn_config_length(comedi_insn * insn, lsampl_t * data)
+{
+	if(insn->n < 1) return -EINVAL;
+
+	switch (data[0]) {
+	case INSN_CONFIG_DIO_OUTPUT:
+	case INSN_CONFIG_DIO_INPUT:
+	case INSN_CONFIG_DISARM:
+	case INSN_CONFIG_RESET:
+		if (insn->n == 1)
+			return 0;
+		break;
+	case INSN_CONFIG_ARM:
+	case INSN_CONFIG_DIO_QUERY:
+	case INSN_CONFIG_BLOCK_SIZE:
+	case INSN_CONFIG_FILTER:
+	case INSN_CONFIG_SERIAL_CLOCK:
+	case INSN_CONFIG_BIDIRECTIONAL_DATA:
+	case INSN_CONFIG_ALT_SOURCE:
+	case INSN_CONFIG_SET_COUNTER_MODE:
+	case INSN_CONFIG_8254_READ_STATUS:
+	case INSN_CONFIG_SET_ROUTING:
+	case INSN_CONFIG_GET_ROUTING:
+	case INSN_CONFIG_GET_PWM_STATUS:
+	case INSN_CONFIG_PWM_SET_PERIOD:
+	case INSN_CONFIG_PWM_GET_PERIOD:
+		if (insn->n == 2)
+			return 0;
+		break;
+	case INSN_CONFIG_SET_GATE_SRC:
+	case INSN_CONFIG_GET_GATE_SRC:
+	case INSN_CONFIG_SET_CLOCK_SRC:
+	case INSN_CONFIG_GET_CLOCK_SRC:
+	case INSN_CONFIG_SET_OTHER_SRC:
+	case INSN_CONFIG_GET_COUNTER_STATUS:
+	case INSN_CONFIG_PWM_SET_H_BRIDGE:
+	case INSN_CONFIG_PWM_GET_H_BRIDGE:
+	case INSN_CONFIG_GET_HARDWARE_BUFFER_SIZE:
+		if (insn->n == 3)
+			return 0;
+		break;
+	case INSN_CONFIG_PWM_OUTPUT:
+	case INSN_CONFIG_ANALOG_TRIG:
+		if (insn->n == 5)
+			return 0;
+		break;
+		//by default we allow the insn since we don't have checks for all possible cases yet
+	default:
+		rt_printk
+			("comedi: no check for data length of config insn id %i is implemented.\n"
+			" Add a check to %s in %s.\n"
+			" Assuming n=%i is correct.\n", data[0], __FUNCTION__,
+			__FILE__, insn->n);
+		return 0;
+		break;
+	}
+	return -EINVAL;
+}
+
+static int parse_insn(comedi_device * dev, comedi_insn * insn, lsampl_t * data,
+	void *file)
+{
+	comedi_subdevice *s;
+	int ret = 0;
+	int i;
+
+	if (insn->insn & INSN_MASK_SPECIAL) {
+		/* a non-subdevice instruction */
+
+		switch (insn->insn) {
+		case INSN_GTOD:
+			{
+				struct timeval tv;
+
+				if (insn->n != 2) {
+					ret = -EINVAL;
+					break;
+				}
+
+				do_gettimeofday(&tv);
+				data[0] = tv.tv_sec;
+				data[1] = tv.tv_usec;
+				ret = 2;
+
+				break;
+			}
+		case INSN_WAIT:
+			if (insn->n != 1 || data[0] >= 100000) {
+				ret = -EINVAL;
+				break;
+			}
+			udelay(data[0] / 1000);
+			ret = 1;
+			break;
+		case INSN_INTTRIG:
+			if (insn->n != 1) {
+				ret = -EINVAL;
+				break;
+			}
+			if (insn->subdev >= dev->n_subdevices) {
+				DPRINTK("%d not usable subdevice\n",
+					insn->subdev);
+				ret = -EINVAL;
+				break;
+			}
+			s = dev->subdevices + insn->subdev;
+			if (!s->async) {
+				DPRINTK("no async\n");
+				ret = -EINVAL;
+				break;
+			}
+			if (!s->async->inttrig) {
+				DPRINTK("no inttrig\n");
+				ret = -EAGAIN;
+				break;
+			}
+			ret = s->async->inttrig(dev, s, insn->data[0]);
+			if (ret >= 0)
+				ret = 1;
+			break;
+		default:
+			DPRINTK("invalid insn\n");
+			ret = -EINVAL;
+			break;
+		}
+	} else {
+		/* a subdevice instruction */
+		lsampl_t maxdata;
+
+		if (insn->subdev >= dev->n_subdevices) {
+			DPRINTK("subdevice %d out of range\n", insn->subdev);
+			ret = -EINVAL;
+			goto out;
+		}
+		s = dev->subdevices + insn->subdev;
+
+		if (s->type == COMEDI_SUBD_UNUSED) {
+			DPRINTK("%d not usable subdevice\n", insn->subdev);
+			ret = -EIO;
+			goto out;
+		}
+
+		/* are we locked? (ioctl lock) */
+		if (s->lock && s->lock != file) {
+			DPRINTK("device locked\n");
+			ret = -EACCES;
+			goto out;
+		}
+
+		if ((ret = check_chanlist(s, 1, &insn->chanspec)) < 0) {
+			ret = -EINVAL;
+			DPRINTK("bad chanspec\n");
+			goto out;
+		}
+
+		if (s->busy) {
+			ret = -EBUSY;
+			goto out;
+		}
+		/* This looks arbitrary.  It is. */
+		s->busy = &parse_insn;
+		switch (insn->insn) {
+		case INSN_READ:
+			ret = s->insn_read(dev, s, insn, data);
+			break;
+		case INSN_WRITE:
+			maxdata = s->maxdata_list
+				? s->maxdata_list[CR_CHAN(insn->chanspec)]
+				: s->maxdata;
+			for (i = 0; i < insn->n; ++i) {
+				if (data[i] > maxdata) {
+					ret = -EINVAL;
+					DPRINTK("bad data value(s)\n");
+					break;
+				}
+			}
+			if (ret == 0)
+				ret = s->insn_write(dev, s, insn, data);
+			break;
+		case INSN_BITS:
+			if (insn->n != 2) {
+				ret = -EINVAL;
+				break;
+			}
+			ret = s->insn_bits(dev, s, insn, data);
+			break;
+		case INSN_CONFIG:
+			ret = check_insn_config_length(insn, data);
+			if (ret)
+				break;
+			ret = s->insn_config(dev, s, insn, data);
+			break;
+		default:
+			ret = -EINVAL;
+			break;
+		}
+
+		s->busy = NULL;
+	}
+
+      out:
+	return ret;
+}
+
+/*
+ * 	COMEDI_INSN
+ * 	synchronous instructions
+ *
+ * 	arg:
+ * 		pointer to insn
+ *
+ * 	reads:
+ * 		comedi_insn struct at arg
+ * 		data (for writes)
+ *
+ * 	writes:
+ * 		data (for reads)
+ */
+static int do_insn_ioctl(comedi_device * dev, void *arg, void *file)
+{
+	comedi_insn insn;
+	lsampl_t *data = NULL;
+	int ret = 0;
+
+	data = kmalloc(sizeof(lsampl_t) * MAX_SAMPLES, GFP_KERNEL);
+	if (!data) {
+		ret = -ENOMEM;
+		goto error;
+	}
+
+	if (copy_from_user(&insn, arg, sizeof(comedi_insn))) {
+		ret = -EFAULT;
+		goto error;
+	}
+
+	/* This is where the behavior of insn and insnlist deviate. */
+	if (insn.n > MAX_SAMPLES)
+		insn.n = MAX_SAMPLES;
+	if (insn.insn & INSN_MASK_WRITE) {
+		if (copy_from_user(data, insn.data, insn.n * sizeof(lsampl_t))) {
+			ret = -EFAULT;
+			goto error;
+		}
+	}
+	ret = parse_insn(dev, &insn, data, file);
+	if (ret < 0)
+		goto error;
+	if (insn.insn & INSN_MASK_READ) {
+		if (copy_to_user(insn.data, data, insn.n * sizeof(lsampl_t))) {
+			ret = -EFAULT;
+			goto error;
+		}
+	}
+	ret = insn.n;
+
+      error:
+	if (data)
+		kfree(data);
+
+	return ret;
+}
+
+/*
+	COMEDI_CMD
+	command ioctl
+
+	arg:
+		pointer to cmd structure
+
+	reads:
+		cmd structure at arg
+		channel/range list
+
+	writes:
+		modified cmd structure at arg
+
+*/
+static int do_cmd_ioctl(comedi_device * dev, void *arg, void *file)
+{
+	comedi_cmd user_cmd;
+	comedi_subdevice *s;
+	comedi_async *async;
+	int ret = 0;
+	unsigned int *chanlist_saver = NULL;
+
+	if (copy_from_user(&user_cmd, arg, sizeof(comedi_cmd))) {
+		DPRINTK("bad cmd address\n");
+		return -EFAULT;
+	}
+	// save user's chanlist pointer so it can be restored later
+	chanlist_saver = user_cmd.chanlist;
+
+	if (user_cmd.subdev >= dev->n_subdevices) {
+		DPRINTK("%d no such subdevice\n", user_cmd.subdev);
+		return -ENODEV;
+	}
+
+	s = dev->subdevices + user_cmd.subdev;
+	async = s->async;
+
+	if (s->type == COMEDI_SUBD_UNUSED) {
+		DPRINTK("%d not valid subdevice\n", user_cmd.subdev);
+		return -EIO;
+	}
+
+	if (!s->do_cmd || !s->do_cmdtest || !s->async) {
+		DPRINTK("subdevice %i does not support commands\n",
+			user_cmd.subdev);
+		return -EIO;
+	}
+
+	/* are we locked? (ioctl lock) */
+	if (s->lock && s->lock != file) {
+		DPRINTK("subdevice locked\n");
+		return -EACCES;
+	}
+
+	/* are we busy? */
+	if (s->busy) {
+		DPRINTK("subdevice busy\n");
+		return -EBUSY;
+	}
+	s->busy = file;
+
+	/* make sure channel/gain list isn't too long */
+	if (user_cmd.chanlist_len > s->len_chanlist) {
+		DPRINTK("channel/gain list too long %u > %d\n",
+			user_cmd.chanlist_len, s->len_chanlist);
+		ret = -EINVAL;
+		goto cleanup;
+	}
+
+	/* make sure channel/gain list isn't too short */
+	if (user_cmd.chanlist_len < 1) {
+		DPRINTK("channel/gain list too short %u < 1\n",
+			user_cmd.chanlist_len);
+		ret = -EINVAL;
+		goto cleanup;
+	}
+
+	if (async->cmd.chanlist)
+		kfree(async->cmd.chanlist);
+	async->cmd = user_cmd;
+	async->cmd.data = NULL;
+	/* load channel/gain list */
+	async->cmd.chanlist =
+		kmalloc(async->cmd.chanlist_len * sizeof(int), GFP_KERNEL);
+	if (!async->cmd.chanlist) {
+		DPRINTK("allocation failed\n");
+		ret = -ENOMEM;
+		goto cleanup;
+	}
+
+	if (copy_from_user(async->cmd.chanlist, user_cmd.chanlist,
+			async->cmd.chanlist_len * sizeof(int))) {
+		DPRINTK("fault reading chanlist\n");
+		ret = -EFAULT;
+		goto cleanup;
+	}
+
+	/* make sure each element in channel/gain list is valid */
+	if ((ret = check_chanlist(s, async->cmd.chanlist_len,
+				async->cmd.chanlist)) < 0) {
+		DPRINTK("bad chanlist\n");
+		goto cleanup;
+	}
+
+	ret = s->do_cmdtest(dev, s, &async->cmd);
+
+	if (async->cmd.flags & TRIG_BOGUS || ret) {
+		DPRINTK("test returned %d\n", ret);
+		user_cmd = async->cmd;
+		// restore chanlist pointer before copying back
+		user_cmd.chanlist = chanlist_saver;
+		user_cmd.data = NULL;
+		if (copy_to_user(arg, &user_cmd, sizeof(comedi_cmd))) {
+			DPRINTK("fault writing cmd\n");
+			ret = -EFAULT;
+			goto cleanup;
+		}
+		ret = -EAGAIN;
+		goto cleanup;
+	}
+
+	if (!async->prealloc_bufsz) {
+		ret = -ENOMEM;
+		DPRINTK("no buffer (?)\n");
+		goto cleanup;
+	}
+
+	comedi_reset_async_buf(async);
+
+	async->cb_mask =
+		COMEDI_CB_EOA | COMEDI_CB_BLOCK | COMEDI_CB_ERROR |
+		COMEDI_CB_OVERFLOW;
+	if (async->cmd.flags & TRIG_WAKE_EOS) {
+		async->cb_mask |= COMEDI_CB_EOS;
+	}
+
+	comedi_set_subdevice_runflags(s, ~0, SRF_USER | SRF_RUNNING);
+
+#ifdef CONFIG_COMEDI_RT
+	if (async->cmd.flags & TRIG_RT) {
+		if (comedi_switch_to_rt(dev) == 0)
+			comedi_set_subdevice_runflags(s, SRF_RT, SRF_RT);
+	}
+#endif
+
+	ret = s->do_cmd(dev, s);
+	if (ret == 0)
+		return 0;
+
+      cleanup:
+	do_become_nonbusy(dev, s);
+
+	return ret;
+}
+
+/*
+	COMEDI_CMDTEST
+	command testing ioctl
+
+	arg:
+		pointer to cmd structure
+
+	reads:
+		cmd structure at arg
+		channel/range list
+
+	writes:
+		modified cmd structure at arg
+
+*/
+static int do_cmdtest_ioctl(comedi_device * dev, void *arg, void *file)
+{
+	comedi_cmd user_cmd;
+	comedi_subdevice *s;
+	int ret = 0;
+	unsigned int *chanlist = NULL;
+	unsigned int *chanlist_saver = NULL;
+
+	if (copy_from_user(&user_cmd, arg, sizeof(comedi_cmd))) {
+		DPRINTK("bad cmd address\n");
+		return -EFAULT;
+	}
+	// save user's chanlist pointer so it can be restored later
+	chanlist_saver = user_cmd.chanlist;
+
+	if (user_cmd.subdev >= dev->n_subdevices) {
+		DPRINTK("%d no such subdevice\n", user_cmd.subdev);
+		return -ENODEV;
+	}
+
+	s = dev->subdevices + user_cmd.subdev;
+	if (s->type == COMEDI_SUBD_UNUSED) {
+		DPRINTK("%d not valid subdevice\n", user_cmd.subdev);
+		return -EIO;
+	}
+
+	if (!s->do_cmd || !s->do_cmdtest) {
+		DPRINTK("subdevice %i does not support commands\n",
+			user_cmd.subdev);
+		return -EIO;
+	}
+
+	/* make sure channel/gain list isn't too long */
+	if (user_cmd.chanlist_len > s->len_chanlist) {
+		DPRINTK("channel/gain list too long %d > %d\n",
+			user_cmd.chanlist_len, s->len_chanlist);
+		ret = -EINVAL;
+		goto cleanup;
+	}
+
+	/* load channel/gain list */
+	if (user_cmd.chanlist) {
+		chanlist =
+			kmalloc(user_cmd.chanlist_len * sizeof(int),
+			GFP_KERNEL);
+		if (!chanlist) {
+			DPRINTK("allocation failed\n");
+			ret = -ENOMEM;
+			goto cleanup;
+		}
+
+		if (copy_from_user(chanlist, user_cmd.chanlist,
+				user_cmd.chanlist_len * sizeof(int))) {
+			DPRINTK("fault reading chanlist\n");
+			ret = -EFAULT;
+			goto cleanup;
+		}
+
+		/* make sure each element in channel/gain list is valid */
+		if ((ret = check_chanlist(s, user_cmd.chanlist_len,
+					chanlist)) < 0) {
+			DPRINTK("bad chanlist\n");
+			goto cleanup;
+		}
+
+		user_cmd.chanlist = chanlist;
+	}
+
+	ret = s->do_cmdtest(dev, s, &user_cmd);
+
+	// restore chanlist pointer before copying back
+	user_cmd.chanlist = chanlist_saver;
+
+	if (copy_to_user(arg, &user_cmd, sizeof(comedi_cmd))) {
+		DPRINTK("bad cmd address\n");
+		ret = -EFAULT;
+		goto cleanup;
+	}
+      cleanup:
+	if (chanlist)
+		kfree(chanlist);
+
+	return ret;
+}
+
+/*
+	COMEDI_LOCK
+	lock subdevice
+
+	arg:
+		subdevice number
+
+	reads:
+		none
+
+	writes:
+		none
+
+*/
+
+static int do_lock_ioctl(comedi_device * dev, unsigned int arg, void *file)
+{
+	int ret = 0;
+	unsigned long flags;
+	comedi_subdevice *s;
+
+	if (arg >= dev->n_subdevices)
+		return -EINVAL;
+	s = dev->subdevices + arg;
+
+	comedi_spin_lock_irqsave(&s->spin_lock, flags);
+	if (s->busy || s->lock) {
+		ret = -EBUSY;
+	} else {
+		s->lock = file;
+	}
+	comedi_spin_unlock_irqrestore(&s->spin_lock, flags);
+
+	if (ret < 0)
+		return ret;
+
+#if 0
+	if (s->lock_f)
+		ret = s->lock_f(dev, s);
+#endif
+
+	return ret;
+}
+
+/*
+	COMEDI_UNLOCK
+	unlock subdevice
+
+	arg:
+		subdevice number
+
+	reads:
+		none
+
+	writes:
+		none
+
+	This function isn't protected by the semaphore, since
+	we already own the lock.
+*/
+static int do_unlock_ioctl(comedi_device * dev, unsigned int arg, void *file)
+{
+	comedi_subdevice *s;
+
+	if (arg >= dev->n_subdevices)
+		return -EINVAL;
+	s = dev->subdevices + arg;
+
+	if (s->busy)
+		return -EBUSY;
+
+	if (s->lock && s->lock != file)
+		return -EACCES;
+
+	if (s->lock == file) {
+#if 0
+		if (s->unlock)
+			s->unlock(dev, s);
+#endif
+
+		s->lock = NULL;
+	}
+
+	return 0;
+}
+
+/*
+	COMEDI_CANCEL
+	cancel acquisition ioctl
+
+	arg:
+		subdevice number
+
+	reads:
+		nothing
+
+	writes:
+		nothing
+
+*/
+static int do_cancel_ioctl(comedi_device * dev, unsigned int arg, void *file)
+{
+	comedi_subdevice *s;
+
+	if (arg >= dev->n_subdevices)
+		return -EINVAL;
+	s = dev->subdevices + arg;
+	if (s->async == NULL)
+		return -EINVAL;
+
+	if (s->lock && s->lock != file)
+		return -EACCES;
+
+	if (!s->busy)
+		return 0;
+
+	if (s->busy != file)
+		return -EBUSY;
+
+	return do_cancel(dev, s);
+}
+
+/*
+	COMEDI_POLL ioctl
+	instructs driver to synchronize buffers
+
+	arg:
+		subdevice number
+
+	reads:
+		nothing
+
+	writes:
+		nothing
+
+*/
+static int do_poll_ioctl(comedi_device * dev, unsigned int arg, void *file)
+{
+	comedi_subdevice *s;
+
+	if (arg >= dev->n_subdevices)
+		return -EINVAL;
+	s = dev->subdevices + arg;
+
+	if (s->lock && s->lock != file)
+		return -EACCES;
+
+	if (!s->busy)
+		return 0;
+
+	if (s->busy != file)
+		return -EBUSY;
+
+	if (s->poll)
+		return s->poll(dev, s);
+
+	return -EINVAL;
+}
+
+static int do_cancel(comedi_device * dev, comedi_subdevice * s)
+{
+	int ret = 0;
+
+	if ((comedi_get_subdevice_runflags(s) & SRF_RUNNING) && s->cancel)
+		ret = s->cancel(dev, s);
+
+	do_become_nonbusy(dev, s);
+
+	return ret;
+}
+
+void comedi_unmap(struct vm_area_struct *area)
+{
+	comedi_async *async;
+	comedi_device *dev;
+
+	async = area->vm_private_data;
+	dev = async->subdevice->device;
+
+	mutex_lock(&dev->mutex);
+	async->mmap_count--;
+	mutex_unlock(&dev->mutex);
+}
+
+static struct vm_operations_struct comedi_vm_ops = {
+      close:comedi_unmap,
+};
+
+static int comedi_mmap(struct file *file, struct vm_area_struct *vma)
+{
+	const unsigned minor = iminor(file->f_dentry->d_inode);
+	struct comedi_device_file_info *dev_file_info = comedi_get_device_file_info(minor);
+	comedi_device *dev = dev_file_info->device;
+	comedi_async *async = NULL;
+	unsigned long start = vma->vm_start;
+	unsigned long size;
+	int n_pages;
+	int i;
+	int retval;
+	comedi_subdevice *s;
+
+	mutex_lock(&dev->mutex);
+	if (!dev->attached) {
+		DPRINTK("no driver configured on comedi%i\n", dev->minor);
+		retval = -ENODEV;
+		goto done;
+	}
+	if (vma->vm_flags & VM_WRITE) {
+		s = comedi_get_write_subdevice(dev_file_info);
+	} else {
+		s = comedi_get_read_subdevice(dev_file_info);
+	}
+	if (s == NULL) {
+		retval = -EINVAL;
+		goto done;
+	}
+	async = s->async;
+	if (async == NULL) {
+		retval = -EINVAL;
+		goto done;
+	}
+
+	if (vma->vm_pgoff != 0) {
+		DPRINTK("comedi: mmap() offset must be 0.\n");
+		retval = -EINVAL;
+		goto done;
+	}
+
+	size = vma->vm_end - vma->vm_start;
+	if (size > async->prealloc_bufsz) {
+		retval = -EFAULT;
+		goto done;
+	}
+	if (size & (~PAGE_MASK)) {
+		retval = -EFAULT;
+		goto done;
+	}
+
+	n_pages = size >> PAGE_SHIFT;
+	for (i = 0; i < n_pages; ++i) {
+		if (remap_pfn_range(vma, start,
+				page_to_pfn(virt_to_page(async->
+						buf_page_list[i].virt_addr)),
+				PAGE_SIZE, PAGE_SHARED)) {
+			retval = -EAGAIN;
+			goto done;
+		}
+		start += PAGE_SIZE;
+	}
+
+	vma->vm_ops = &comedi_vm_ops;
+	vma->vm_private_data = async;
+
+	async->mmap_count++;
+
+	retval = 0;
+      done:
+	mutex_unlock(&dev->mutex);
+	return retval;
+}
+
+static unsigned int comedi_poll(struct file *file, poll_table * wait)
+{
+	unsigned int mask = 0;
+	const unsigned minor = iminor(file->f_dentry->d_inode);
+	struct comedi_device_file_info *dev_file_info = comedi_get_device_file_info(minor);
+	comedi_device *dev = dev_file_info->device;
+	comedi_subdevice *read_subdev;
+	comedi_subdevice *write_subdev;
+
+	mutex_lock(&dev->mutex);
+	if (!dev->attached) {
+		DPRINTK("no driver configured on comedi%i\n", dev->minor);
+		mutex_unlock(&dev->mutex);
+		return 0;
+	}
+
+	mask = 0;
+	read_subdev = comedi_get_read_subdevice(dev_file_info);
+	if (read_subdev) {
+		poll_wait(file, &read_subdev->async->wait_head, wait);
+		if (!read_subdev->busy
+			|| comedi_buf_read_n_available(read_subdev->async) > 0
+			|| !(comedi_get_subdevice_runflags(read_subdev) &
+				SRF_RUNNING)) {
+			mask |= POLLIN | POLLRDNORM;
+		}
+	}
+	write_subdev = comedi_get_write_subdevice(dev_file_info);
+	if (write_subdev) {
+		poll_wait(file, &write_subdev->async->wait_head, wait);
+		comedi_buf_write_alloc(write_subdev->async, write_subdev->async->prealloc_bufsz);
+		if (!write_subdev->busy
+			|| !(comedi_get_subdevice_runflags(write_subdev) &
+				SRF_RUNNING)
+			|| comedi_buf_write_n_allocated(write_subdev->async) >=
+			bytes_per_sample(write_subdev->async->subdevice)) {
+			mask |= POLLOUT | POLLWRNORM;
+		}
+	}
+
+	mutex_unlock(&dev->mutex);
+	return mask;
+}
+
+static ssize_t comedi_write(struct file *file, const char *buf, size_t nbytes,
+	loff_t * offset)
+{
+	comedi_subdevice *s;
+	comedi_async *async;
+	int n, m, count = 0, retval = 0;
+	DECLARE_WAITQUEUE(wait, current);
+	const unsigned minor = iminor(file->f_dentry->d_inode);
+	struct comedi_device_file_info *dev_file_info = comedi_get_device_file_info(minor);
+	comedi_device *dev = dev_file_info->device;
+
+	if (!dev->attached) {
+		DPRINTK("no driver configured on comedi%i\n", dev->minor);
+		retval = -ENODEV;
+		goto done;
+	}
+
+	s = comedi_get_write_subdevice(dev_file_info);
+	if (s == NULL) {
+		retval = -EIO;
+		goto done;
+	}
+	async = s->async;
+
+	if (!nbytes) {
+		retval = 0;
+		goto done;
+	}
+	if (!s->busy) {
+		retval = 0;
+		goto done;
+	}
+	if (s->busy != file) {
+		retval = -EACCES;
+		goto done;
+	}
+	add_wait_queue(&async->wait_head, &wait);
+	while (nbytes > 0 && !retval) {
+		set_current_state(TASK_INTERRUPTIBLE);
+
+		n = nbytes;
+
+		m = n;
+		if (async->buf_write_ptr + m > async->prealloc_bufsz) {
+			m = async->prealloc_bufsz - async->buf_write_ptr;
+		}
+		comedi_buf_write_alloc(async, async->prealloc_bufsz);
+		if (m > comedi_buf_write_n_allocated(async)) {
+			m = comedi_buf_write_n_allocated(async);
+		}
+		if (m < n)
+			n = m;
+
+		if (n == 0) {
+			if (!(comedi_get_subdevice_runflags(s) & SRF_RUNNING)) {
+				if (comedi_get_subdevice_runflags(s) &
+					SRF_ERROR) {
+					retval = -EPIPE;
+				} else {
+					retval = 0;
+				}
+				do_become_nonbusy(dev, s);
+				break;
+			}
+			if (file->f_flags & O_NONBLOCK) {
+				retval = -EAGAIN;
+				break;
+			}
+			if (signal_pending(current)) {
+				retval = -ERESTARTSYS;
+				break;
+			}
+			schedule();
+			if (!s->busy) {
+				break;
+			}
+			if (s->busy != file) {
+				retval = -EACCES;
+				break;
+			}
+			continue;
+		}
+
+		m = copy_from_user(async->prealloc_buf + async->buf_write_ptr,
+			buf, n);
+		if (m) {
+			n -= m;
+			retval = -EFAULT;
+		}
+		comedi_buf_write_free(async, n);
+
+		count += n;
+		nbytes -= n;
+
+		buf += n;
+		break;		/* makes device work like a pipe */
+	}
+	set_current_state(TASK_RUNNING);
+	remove_wait_queue(&async->wait_head, &wait);
+
+done:
+	return (count ? count : retval);
+}
+
+static ssize_t comedi_read(struct file *file, char *buf, size_t nbytes,
+	loff_t * offset)
+{
+	comedi_subdevice *s;
+	comedi_async *async;
+	int n, m, count = 0, retval = 0;
+	DECLARE_WAITQUEUE(wait, current);
+	const unsigned minor = iminor(file->f_dentry->d_inode);
+	struct comedi_device_file_info *dev_file_info = comedi_get_device_file_info(minor);
+	comedi_device *dev = dev_file_info->device;
+
+	if (!dev->attached) {
+		DPRINTK("no driver configured on comedi%i\n", dev->minor);
+		retval = -ENODEV;
+		goto done;
+	}
+
+	s = comedi_get_read_subdevice(dev_file_info);
+	if (s == NULL) {
+		retval = -EIO;
+		goto done;
+	}
+	async = s->async;
+	if (!nbytes) {
+		retval = 0;
+		goto done;
+	}
+	if (!s->busy) {
+		retval = 0;
+		goto done;
+	}
+	if (s->busy != file) {
+		retval = -EACCES;
+		goto done;
+	}
+
+	add_wait_queue(&async->wait_head, &wait);
+	while (nbytes > 0 && !retval) {
+		set_current_state(TASK_INTERRUPTIBLE);
+
+		n = nbytes;
+
+		m = comedi_buf_read_n_available(async);
+//printk("%d available\n",m);
+		if (async->buf_read_ptr + m > async->prealloc_bufsz) {
+			m = async->prealloc_bufsz - async->buf_read_ptr;
+		}
+//printk("%d contiguous\n",m);
+		if (m < n)
+			n = m;
+
+		if (n == 0) {
+			if (!(comedi_get_subdevice_runflags(s) & SRF_RUNNING)) {
+				do_become_nonbusy(dev, s);
+				if (comedi_get_subdevice_runflags(s) &
+					SRF_ERROR) {
+					retval = -EPIPE;
+				} else {
+					retval = 0;
+				}
+				break;
+			}
+			if (file->f_flags & O_NONBLOCK) {
+				retval = -EAGAIN;
+				break;
+			}
+			if (signal_pending(current)) {
+				retval = -ERESTARTSYS;
+				break;
+			}
+			schedule();
+			if (!s->busy) {
+				retval = 0;
+				break;
+			}
+			if (s->busy != file) {
+				retval = -EACCES;
+				break;
+			}
+			continue;
+		}
+		m = copy_to_user(buf, async->prealloc_buf +
+			async->buf_read_ptr, n);
+		if (m) {
+			n -= m;
+			retval = -EFAULT;
+		}
+
+		comedi_buf_read_alloc(async, n);
+		comedi_buf_read_free(async, n);
+
+		count += n;
+		nbytes -= n;
+
+		buf += n;
+		break;		/* makes device work like a pipe */
+	}
+	if (!(comedi_get_subdevice_runflags(s) & (SRF_ERROR | SRF_RUNNING)) &&
+		async->buf_read_count - async->buf_write_count == 0) {
+		do_become_nonbusy(dev, s);
+	}
+	set_current_state(TASK_RUNNING);
+	remove_wait_queue(&async->wait_head, &wait);
+
+done:
+	return (count ? count : retval);
+}
+
+/*
+   This function restores a subdevice to an idle state.
+ */
+void do_become_nonbusy(comedi_device * dev, comedi_subdevice * s)
+{
+	comedi_async *async = s->async;
+
+	comedi_set_subdevice_runflags(s, SRF_RUNNING, 0);
+#ifdef CONFIG_COMEDI_RT
+	if (comedi_get_subdevice_runflags(s) & SRF_RT) {
+		comedi_switch_to_non_rt(dev);
+		comedi_set_subdevice_runflags(s, SRF_RT, 0);
+	}
+#endif
+	if (async) {
+		comedi_reset_async_buf(async);
+		async->inttrig = NULL;
+	} else {
+		printk("BUG: (?) do_become_nonbusy called with async=0\n");
+	}
+
+	s->busy = NULL;
+}
+
+static int comedi_open(struct inode *inode, struct file *file)
+{
+	char mod[32];
+	const unsigned minor = iminor(inode);
+	struct comedi_device_file_info *dev_file_info = comedi_get_device_file_info(minor);
+	comedi_device *dev = dev_file_info->device;
+	if (dev == NULL) {
+		DPRINTK("invalid minor number\n");
+		return -ENODEV;
+	}
+
+	/* This is slightly hacky, but we want module autoloading
+	 * to work for root.
+	 * case: user opens device, attached -> ok
+	 * case: user opens device, unattached, in_request_module=0 -> autoload
+	 * case: user opens device, unattached, in_request_module=1 -> fail
+	 * case: root opens device, attached -> ok
+	 * case: root opens device, unattached, in_request_module=1 -> ok
+	 *   (typically called from modprobe)
+	 * case: root opens device, unattached, in_request_module=0 -> autoload
+	 *
+	 * The last could be changed to "-> ok", which would deny root
+	 * autoloading.
+	 */
+	mutex_lock(&dev->mutex);
+	if (dev->attached)
+		goto ok;
+	if (!capable(CAP_SYS_MODULE) && dev->in_request_module) {
+		DPRINTK("in request module\n");
+		mutex_unlock(&dev->mutex);
+		return -ENODEV;
+	}
+	if (capable(CAP_SYS_MODULE) && dev->in_request_module)
+		goto ok;
+
+	dev->in_request_module = 1;
+
+	sprintf(mod, "char-major-%i-%i", COMEDI_MAJOR, dev->minor);
+#ifdef CONFIG_KMOD
+	mutex_unlock(&dev->mutex);
+	request_module(mod);
+	mutex_lock(&dev->mutex);
+#endif
+
+	dev->in_request_module = 0;
+
+	if (!dev->attached && !capable(CAP_SYS_MODULE)) {
+		DPRINTK("not attached and not CAP_SYS_MODULE\n");
+		mutex_unlock(&dev->mutex);
+		return -ENODEV;
+	}
+ok:
+	__module_get(THIS_MODULE);
+
+	if (dev->attached) {
+		if (!try_module_get(dev->driver->module)) {
+			module_put(THIS_MODULE);
+			mutex_unlock(&dev->mutex);
+			return -ENOSYS;
+		}
+	}
+
+	if (dev->attached && dev->use_count == 0 && dev->open) {
+		dev->open(dev);
+	}
+
+	dev->use_count++;
+
+	mutex_unlock(&dev->mutex);
+
+	return 0;
+}
+
+static int comedi_close(struct inode *inode, struct file *file)
+{
+	const unsigned minor = iminor(inode);
+	struct comedi_device_file_info *dev_file_info = comedi_get_device_file_info(minor);
+	comedi_device *dev = dev_file_info->device;
+	comedi_subdevice *s = NULL;
+	int i;
+
+	mutex_lock(&dev->mutex);
+
+	if (dev->subdevices) {
+		for (i = 0; i < dev->n_subdevices; i++) {
+			s = dev->subdevices + i;
+
+			if (s->busy == file) {
+				do_cancel(dev, s);
+			}
+			if (s->lock == file) {
+				s->lock = NULL;
+			}
+		}
+	}
+	if (dev->attached && dev->use_count == 1 && dev->close) {
+		dev->close(dev);
+	}
+
+	module_put(THIS_MODULE);
+	if (dev->attached) {
+		module_put(dev->driver->module);
+	}
+
+	dev->use_count--;
+
+	mutex_unlock(&dev->mutex);
+
+	if (file->f_flags & FASYNC) {
+		comedi_fasync(-1, file, 0);
+	}
+
+	return 0;
+}
+
+static int comedi_fasync(int fd, struct file *file, int on)
+{
+	const unsigned minor = iminor(file->f_dentry->d_inode);
+	struct comedi_device_file_info *dev_file_info = comedi_get_device_file_info(minor);
+	comedi_device *dev = dev_file_info->device;
+
+	return fasync_helper(fd, file, on, &dev->async_queue);
+}
+
+const struct file_operations comedi_fops = {
+      owner:THIS_MODULE,
+#ifdef HAVE_UNLOCKED_IOCTL
+      unlocked_ioctl:comedi_unlocked_ioctl,
+#else
+      ioctl:comedi_ioctl,
+#endif
+#ifdef HAVE_COMPAT_IOCTL
+      compat_ioctl:comedi_compat_ioctl,
+#endif
+      open:comedi_open,
+      release:comedi_close,
+      read:comedi_read,
+      write:comedi_write,
+      mmap:comedi_mmap,
+      poll:comedi_poll,
+      fasync:comedi_fasync,
+};
+
+struct class *comedi_class = NULL;
+static struct cdev comedi_cdev;
+
+static void comedi_cleanup_legacy_minors(void)
+{
+	unsigned i;
+	for (i = 0; i < COMEDI_NUM_LEGACY_MINORS; i++) {
+		comedi_free_board_minor(i);
+	}
+}
+
+static int __init comedi_init(void)
+{
+	int i;
+	int retval;
+
+	printk("comedi: version " COMEDI_RELEASE
+		" - http://www.comedi.org\n");
+
+	memset(comedi_file_info_table, 0, sizeof(struct comedi_device_file_info*) * COMEDI_NUM_MINORS);
+
+	retval = register_chrdev_region(MKDEV(COMEDI_MAJOR, 0),
+		COMEDI_NUM_MINORS, "comedi");
+	if (retval)
+		return -EIO;
+	cdev_init(&comedi_cdev, &comedi_fops);
+	comedi_cdev.owner = THIS_MODULE;
+	kobject_set_name(&comedi_cdev.kobj, "comedi");
+	if (cdev_add(&comedi_cdev, MKDEV(COMEDI_MAJOR, 0), COMEDI_NUM_MINORS)) {
+		unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0),
+			COMEDI_NUM_MINORS);
+		return -EIO;
+	}
+	comedi_class = class_create(THIS_MODULE, "comedi");
+	if (IS_ERR(comedi_class)) {
+		printk("comedi: failed to create class");
+		cdev_del(&comedi_cdev);
+		unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0),
+			COMEDI_NUM_MINORS);
+		return PTR_ERR(comedi_class);
+	}
+
+	/* XXX requires /proc interface */
+	comedi_proc_init();
+
+	// create devices files for legacy/manual use
+	for (i = 0; i < COMEDI_NUM_LEGACY_MINORS; i++) {
+		int minor;
+		minor = comedi_alloc_board_minor(NULL);
+		if(minor < 0)
+		{
+			comedi_cleanup_legacy_minors();
+			cdev_del(&comedi_cdev);
+			unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0),
+				COMEDI_NUM_MINORS);
+			return minor;
+		}
+	}
+
+	comedi_rt_init();
+
+	comedi_register_ioctl32();
+
+	return 0;
+}
+
+static void __exit comedi_cleanup(void)
+{
+	int i;
+
+	comedi_cleanup_legacy_minors();
+	for(i = 0; i < COMEDI_NUM_MINORS; ++i)
+	{
+		BUG_ON(comedi_file_info_table[i]);
+	}
+
+	class_destroy(comedi_class);
+	cdev_del(&comedi_cdev);
+	unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0), COMEDI_NUM_MINORS);
+
+	comedi_proc_cleanup();
+
+	comedi_rt_cleanup();
+
+	comedi_unregister_ioctl32();
+}
+
+module_init(comedi_init);
+module_exit(comedi_cleanup);
+
+void comedi_error(const comedi_device * dev, const char *s)
+{
+	rt_printk("comedi%d: %s: %s\n", dev->minor, dev->driver->driver_name,
+		s);
+}
+
+void comedi_event(comedi_device * dev, comedi_subdevice * s)
+{
+	comedi_async *async = s->async;
+	unsigned runflags = 0;
+	unsigned runflags_mask = 0;
+
+	//DPRINTK("comedi_event 0x%x\n",mask);
+
+	if ((comedi_get_subdevice_runflags(s) & SRF_RUNNING) == 0)
+		return;
+
+	if (s->async->
+		events & (COMEDI_CB_EOA | COMEDI_CB_ERROR | COMEDI_CB_OVERFLOW))
+	{
+		runflags_mask |= SRF_RUNNING;
+	}
+	/* remember if an error event has occured, so an error
+	 * can be returned the next time the user does a read() */
+	if (s->async->events & (COMEDI_CB_ERROR | COMEDI_CB_OVERFLOW)) {
+		runflags_mask |= SRF_ERROR;
+		runflags |= SRF_ERROR;
+	}
+	if (runflags_mask) {
+		/*sets SRF_ERROR and SRF_RUNNING together atomically */
+		comedi_set_subdevice_runflags(s, runflags_mask, runflags);
+	}
+
+	if (async->cb_mask & s->async->events) {
+		if (comedi_get_subdevice_runflags(s) & SRF_USER) {
+
+			if (dev->rt) {
+#ifdef CONFIG_COMEDI_RT
+				// pend wake up
+				comedi_rt_pend_wakeup(&async->wait_head);
+#else
+				printk("BUG: comedi_event() code unreachable\n");
+#endif
+			} else {
+				wake_up_interruptible(&async->wait_head);
+				if (s->subdev_flags & SDF_CMD_READ) {
+					kill_fasync(&dev->async_queue, SIGIO,
+						POLL_IN);
+				}
+				if (s->subdev_flags & SDF_CMD_WRITE) {
+					kill_fasync(&dev->async_queue, SIGIO,
+						POLL_OUT);
+				}
+			}
+		} else {
+			if (async->cb_func)
+				async->cb_func(s->async->events, async->cb_arg);
+			/* XXX bug here.  If subdevice A is rt, and
+			 * subdevice B tries to callback to a normal
+			 * linux kernel function, it will be at the
+			 * wrong priority.  Since this isn't very
+			 * common, I'm not going to worry about it. */
+		}
+	}
+	s->async->events = 0;
+}
+
+void comedi_set_subdevice_runflags(comedi_subdevice * s, unsigned mask,
+	unsigned bits)
+{
+	unsigned long flags;
+
+	comedi_spin_lock_irqsave(&s->spin_lock, flags);
+	s->runflags &= ~mask;
+	s->runflags |= (bits & mask);
+	comedi_spin_unlock_irqrestore(&s->spin_lock, flags);
+}
+
+unsigned comedi_get_subdevice_runflags(comedi_subdevice * s)
+{
+	unsigned long flags;
+	unsigned runflags;
+
+	comedi_spin_lock_irqsave(&s->spin_lock, flags);
+	runflags = s->runflags;
+	comedi_spin_unlock_irqrestore(&s->spin_lock, flags);
+	return runflags;
+}
+
+static int is_device_busy(comedi_device * dev)
+{
+	comedi_subdevice *s;
+	int i;
+
+	if (!dev->attached)
+		return 0;
+
+	for (i = 0; i < dev->n_subdevices; i++) {
+		s = dev->subdevices + i;
+		if (s->busy)
+			return 1;
+		if (s->async && s->async->mmap_count)
+			return 1;
+	}
+
+	return 0;
+}
+
+void comedi_device_init(comedi_device *dev)
+{
+	memset(dev, 0, sizeof(comedi_device));
+	spin_lock_init(&dev->spinlock);
+	mutex_init(&dev->mutex);
+	dev->minor = -1;
+}
+
+void comedi_device_cleanup(comedi_device *dev)
+{
+	if(dev == NULL) return;
+	mutex_lock(&dev->mutex);
+	comedi_device_detach(dev);
+	mutex_unlock(&dev->mutex);
+	mutex_destroy(&dev->mutex);
+}
+
+int comedi_alloc_board_minor(struct device *hardware_device)
+{
+	unsigned long flags;
+	struct comedi_device_file_info *info;
+	device_create_result_type *csdev;
+	unsigned i;
+
+	info = kzalloc(sizeof(struct comedi_device_file_info), GFP_KERNEL);
+	if(info == NULL) return -ENOMEM;
+	info->device = kzalloc(sizeof(comedi_device), GFP_KERNEL);
+	if(info->device == NULL)
+	{
+		kfree(info);
+		return -ENOMEM;
+	}
+	comedi_device_init(info->device);
+	comedi_spin_lock_irqsave(&comedi_file_info_table_lock, flags);
+	for(i = 0; i < COMEDI_NUM_BOARD_MINORS; ++i)
+	{
+		if(comedi_file_info_table[i] == NULL)
+		{
+			comedi_file_info_table[i] = info;
+			break;
+		}
+	}
+	comedi_spin_unlock_irqrestore(&comedi_file_info_table_lock, flags);
+	if(i == COMEDI_NUM_BOARD_MINORS)
+	{
+		comedi_device_cleanup(info->device);
+		kfree(info->device);
+		kfree(info);
+		rt_printk("comedi: error: ran out of minor numbers for board device files.\n");
+		return -EBUSY;
+	}
+	info->device->minor = i;
+	csdev = COMEDI_DEVICE_CREATE(comedi_class, NULL,
+		MKDEV(COMEDI_MAJOR, i), NULL, hardware_device, "comedi%i", i);
+	if(!IS_ERR(csdev)) {
+		info->device->class_dev = csdev;
+	}
+	return i;
+}
+
+void comedi_free_board_minor(unsigned minor)
+{
+	unsigned long flags;
+	struct comedi_device_file_info *info;
+
+	BUG_ON(minor >= COMEDI_NUM_BOARD_MINORS);
+	comedi_spin_lock_irqsave(&comedi_file_info_table_lock, flags);
+	info = comedi_file_info_table[minor];
+	comedi_file_info_table[minor] = NULL;
+	comedi_spin_unlock_irqrestore(&comedi_file_info_table_lock, flags);
+
+	if(info)
+	{
+		comedi_device *dev = info->device;
+		if(dev)
+		{
+			if(dev->class_dev)
+			{
+				device_destroy(comedi_class, MKDEV(COMEDI_MAJOR, dev->minor));
+			}
+			comedi_device_cleanup(dev);
+			kfree(dev);
+		}
+		kfree(info);
+	}
+}
+
+int comedi_alloc_subdevice_minor(comedi_device *dev, comedi_subdevice *s)
+{
+	unsigned long flags;
+	struct comedi_device_file_info *info;
+	device_create_result_type *csdev;
+	unsigned i;
+
+	info = kmalloc(sizeof(struct comedi_device_file_info), GFP_KERNEL);
+	if(info == NULL) return -ENOMEM;
+	info->device = dev;
+	info->read_subdevice = s;
+	info->write_subdevice = s;
+	comedi_spin_lock_irqsave(&comedi_file_info_table_lock, flags);
+	for(i = COMEDI_FIRST_SUBDEVICE_MINOR; i < COMEDI_NUM_BOARD_MINORS; ++i)
+	{
+		if(comedi_file_info_table[i] == NULL)
+		{
+			comedi_file_info_table[i] = info;
+			break;
+		}
+	}
+	comedi_spin_unlock_irqrestore(&comedi_file_info_table_lock, flags);
+	if(i == COMEDI_NUM_MINORS)
+	{
+		kfree(info);
+		rt_printk("comedi: error: ran out of minor numbers for board device files.\n");
+		return -EBUSY;
+	}
+	s->minor = i;
+	csdev = COMEDI_DEVICE_CREATE(comedi_class, dev->class_dev,
+		MKDEV(COMEDI_MAJOR, i), NULL, NULL, "comedi%i_subd%i", dev->minor, (int)(s - dev->subdevices));
+	if(!IS_ERR(csdev))
+	{
+		s->class_dev = csdev;
+	}
+	return i;
+}
+
+void comedi_free_subdevice_minor(comedi_subdevice *s)
+{
+	unsigned long flags;
+	struct comedi_device_file_info *info;
+
+	if(s == NULL) return;
+	if(s->minor < 0) return;
+
+	BUG_ON(s->minor >= COMEDI_NUM_MINORS);
+	BUG_ON(s->minor < COMEDI_FIRST_SUBDEVICE_MINOR);
+
+	comedi_spin_lock_irqsave(&comedi_file_info_table_lock, flags);
+	info = comedi_file_info_table[s->minor];
+	comedi_file_info_table[s->minor] = NULL;
+	comedi_spin_unlock_irqrestore(&comedi_file_info_table_lock, flags);
+
+	if(s->class_dev)
+	{
+		device_destroy(comedi_class, MKDEV(COMEDI_MAJOR, s->minor));
+		s->class_dev = NULL;
+	}
+	kfree(info);
+}
+
+struct comedi_device_file_info *comedi_get_device_file_info(unsigned minor)
+{
+	unsigned long flags;
+	struct comedi_device_file_info *info;
+
+	BUG_ON(minor >= COMEDI_NUM_MINORS);
+	comedi_spin_lock_irqsave(&comedi_file_info_table_lock, flags);
+	info = comedi_file_info_table[minor];
+	comedi_spin_unlock_irqrestore(&comedi_file_info_table_lock, flags);
+	return info;
+}
diff --git a/drivers/staging/comedi/comedi_fops.h b/drivers/staging/comedi/comedi_fops.h
new file mode 100644
index 0000000..08a5712
--- /dev/null
+++ b/drivers/staging/comedi/comedi_fops.h
@@ -0,0 +1,8 @@
+
+#ifndef _COMEDI_FOPS_H
+#define _COMEDI_FOPS_H
+
+extern struct class *comedi_class;
+extern const struct file_operations comedi_fops;
+
+#endif //_COMEDI_FOPS_H
diff --git a/drivers/staging/comedi/comedi_ksyms.c b/drivers/staging/comedi/comedi_ksyms.c
new file mode 100644
index 0000000..90d5728
--- /dev/null
+++ b/drivers/staging/comedi/comedi_ksyms.c
@@ -0,0 +1,77 @@
+/*
+    module/exp_ioctl.c
+    exported comedi functions
+
+    COMEDI - Linux Control and Measurement Device Interface
+    Copyright (C) 1997-8 David A. Schleef <ds@schleef.org>
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+*/
+
+#define __NO_VERSION__
+#ifndef EXPORT_SYMTAB
+#define EXPORT_SYMTAB
+#endif
+
+#include "comedidev.h"
+
+/* for drivers */
+EXPORT_SYMBOL(comedi_driver_register);
+EXPORT_SYMBOL(comedi_driver_unregister);
+//EXPORT_SYMBOL(comedi_bufcheck);
+//EXPORT_SYMBOL(comedi_done);
+//EXPORT_SYMBOL(comedi_error_done);
+EXPORT_SYMBOL(comedi_error);
+//EXPORT_SYMBOL(comedi_eobuf);
+//EXPORT_SYMBOL(comedi_eos);
+EXPORT_SYMBOL(comedi_event);
+EXPORT_SYMBOL(comedi_get_subdevice_runflags);
+EXPORT_SYMBOL(comedi_set_subdevice_runflags);
+EXPORT_SYMBOL(range_bipolar10);
+EXPORT_SYMBOL(range_bipolar5);
+EXPORT_SYMBOL(range_bipolar2_5);
+EXPORT_SYMBOL(range_unipolar10);
+EXPORT_SYMBOL(range_unipolar5);
+EXPORT_SYMBOL(range_unknown);
+#ifdef CONFIG_COMEDI_RT
+EXPORT_SYMBOL(comedi_free_irq);
+EXPORT_SYMBOL(comedi_request_irq);
+EXPORT_SYMBOL(comedi_switch_to_rt);
+EXPORT_SYMBOL(comedi_switch_to_non_rt);
+EXPORT_SYMBOL(rt_pend_call);
+#endif
+#ifdef CONFIG_COMEDI_DEBUG
+EXPORT_SYMBOL(comedi_debug);
+#endif
+EXPORT_SYMBOL_GPL(comedi_alloc_board_minor);
+EXPORT_SYMBOL_GPL(comedi_free_board_minor);
+EXPORT_SYMBOL_GPL(comedi_pci_auto_config);
+EXPORT_SYMBOL_GPL(comedi_pci_auto_unconfig);
+
+/* for kcomedilib */
+EXPORT_SYMBOL(check_chanlist);
+EXPORT_SYMBOL_GPL(comedi_get_device_file_info);
+
+EXPORT_SYMBOL(comedi_buf_put);
+EXPORT_SYMBOL(comedi_buf_get);
+EXPORT_SYMBOL(comedi_buf_read_n_available);
+EXPORT_SYMBOL(comedi_buf_write_free);
+EXPORT_SYMBOL(comedi_buf_write_alloc);
+EXPORT_SYMBOL(comedi_buf_read_free);
+EXPORT_SYMBOL(comedi_buf_read_alloc);
+EXPORT_SYMBOL(comedi_buf_memcpy_to);
+EXPORT_SYMBOL(comedi_buf_memcpy_from);
+EXPORT_SYMBOL(comedi_reset_async_buf);
diff --git a/drivers/staging/comedi/comedi_rt.h b/drivers/staging/comedi/comedi_rt.h
new file mode 100644
index 0000000..e7fd57f
--- /dev/null
+++ b/drivers/staging/comedi/comedi_rt.h
@@ -0,0 +1,150 @@
+/*
+    module/comedi_rt.h
+    header file for real-time structures, variables, and constants
+
+    COMEDI - Linux Control and Measurement Device Interface
+    Copyright (C) 1997-2000 David A. Schleef <ds@schleef.org>
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+*/
+
+#ifndef _COMEDI_RT_H
+#define _COMEDI_RT_H
+
+#ifndef _COMEDIDEV_H
+#error comedi_rt.h should only be included by comedidev.h
+#endif
+
+#include <linux/version.h>
+#include <linux/kdev_t.h>
+#include <linux/slab.h>
+#include <linux/errno.h>
+#include <linux/spinlock.h>
+#include <linux/delay.h>
+
+#ifdef CONFIG_COMEDI_RT
+
+#ifdef CONFIG_COMEDI_RTAI
+#include <rtai.h>
+#include <rtai_sched.h>
+#include <rtai_version.h>
+#endif
+#ifdef CONFIG_COMEDI_RTL
+#include <rtl_core.h>
+#include <rtl_time.h>
+//#ifdef RTLINUX_VERSION_CODE
+#include <rtl_sync.h>
+//#endif
+#define rt_printk rtl_printf
+#endif
+#ifdef CONFIG_COMEDI_FUSION
+#define rt_printk(format, args...) printk(format , ## args )
+#endif /* CONFIG_COMEDI_FUSION */
+#ifdef CONFIG_PRIORITY_IRQ
+#define rt_printk printk
+#endif
+
+int comedi_request_irq(unsigned int irq, irqreturn_t(*handler) (int,
+		void *PT_REGS_ARG), unsigned long flags, const char *device,
+	comedi_device * dev_id);
+void comedi_free_irq(unsigned int irq, comedi_device * dev_id);
+void comedi_rt_init(void);
+void comedi_rt_cleanup(void);
+int comedi_switch_to_rt(comedi_device * dev);
+void comedi_switch_to_non_rt(comedi_device * dev);
+void comedi_rt_pend_wakeup(wait_queue_head_t * q);
+extern int rt_pend_call(void (*func) (int arg1, void *arg2), int arg1,
+	void *arg2);
+
+#else
+
+#define comedi_request_irq(a,b,c,d,e) request_irq(a,b,c,d,e)
+#define comedi_free_irq(a,b) free_irq(a,b)
+#define comedi_rt_init() do{}while(0)
+#define comedi_rt_cleanup() do{}while(0)
+#define comedi_switch_to_rt(a) (-1)
+#define comedi_switch_to_non_rt(a) do{}while(0)
+#define comedi_rt_pend_wakeup(a) do{}while(0)
+
+#define rt_printk(format,args...)	printk(format,##args)
+
+#endif
+
+/* Define a spin_lock_irqsave function that will work with rt or without.
+ * Use inline functions instead of just macros to enforce some type checking.
+ */
+#define comedi_spin_lock_irqsave(lock_ptr, flags) \
+	(flags = __comedi_spin_lock_irqsave(lock_ptr))
+
+static inline unsigned long __comedi_spin_lock_irqsave(spinlock_t * lock_ptr)
+{
+	unsigned long flags;
+
+#if defined(CONFIG_COMEDI_RTAI)
+	flags = rt_spin_lock_irqsave(lock_ptr);
+
+#elif defined(CONFIG_COMEDI_RTL)
+	rtl_spin_lock_irqsave(lock_ptr, flags);
+
+#elif defined(CONFIG_COMEDI_RTL_V1)
+	rtl_spin_lock_irqsave(lock_ptr, flags);
+
+#elif defined(CONFIG_COMEDI_FUSION)
+	rthal_spin_lock_irqsave(lock_ptr, flags);
+#else
+	spin_lock_irqsave(lock_ptr, flags);
+
+#endif
+
+	return flags;
+}
+
+static inline void comedi_spin_unlock_irqrestore(spinlock_t * lock_ptr,
+	unsigned long flags)
+{
+
+#if defined(CONFIG_COMEDI_RTAI)
+	rt_spin_unlock_irqrestore(flags, lock_ptr);
+
+#elif defined(CONFIG_COMEDI_RTL)
+	rtl_spin_unlock_irqrestore(lock_ptr, flags);
+
+#elif defined(CONFIG_COMEDI_RTL_V1)
+	rtl_spin_unlock_irqrestore(lock_ptr, flags);
+#elif defined(CONFIG_COMEDI_FUSION)
+	rthal_spin_unlock_irqrestore(lock_ptr, flags);
+#else
+	spin_unlock_irqrestore(lock_ptr, flags);
+
+#endif
+
+}
+
+/* define a RT safe udelay */
+static inline void comedi_udelay(unsigned int usec)
+{
+#if defined(CONFIG_COMEDI_RTAI)
+	static const int nanosec_per_usec = 1000;
+	rt_busy_sleep(usec * nanosec_per_usec);
+#elif defined(CONFIG_COMEDI_RTL)
+	static const int nanosec_per_usec = 1000;
+	rtl_delay(usec * nanosec_per_usec);
+#else
+	udelay(usec);
+#endif
+}
+
+#endif
diff --git a/drivers/staging/comedi/comedidev.h b/drivers/staging/comedi/comedidev.h
new file mode 100644
index 0000000..157e578
--- /dev/null
+++ b/drivers/staging/comedi/comedidev.h
@@ -0,0 +1,529 @@
+/*
+    include/linux/comedidev.h
+    header file for kernel-only structures, variables, and constants
+
+    COMEDI - Linux Control and Measurement Device Interface
+    Copyright (C) 1997-2000 David A. Schleef <ds@schleef.org>
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+*/
+
+#ifndef _COMEDIDEV_H
+#define _COMEDIDEV_H
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/version.h>
+#include <linux/kdev_t.h>
+#include <linux/slab.h>
+#include <linux/errno.h>
+#include <linux/spinlock.h>
+#include <linux/mutex.h>
+#include <linux/wait.h>
+#include <linux/mm.h>
+#include <linux/init.h>
+#include <linux/vmalloc.h>
+#include <linux/mm.h>
+#include <linux/interrupt.h>
+#include <linux/dma-mapping.h>
+#include <asm/uaccess.h>
+#include <asm/io.h>
+
+#include "comedi.h"
+
+#define DPRINTK(format, args...)	do{				\
+	if(comedi_debug)printk("comedi: " format , ## args );		\
+} while(0)
+
+#define COMEDI_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))
+#define COMEDI_VERSION_CODE COMEDI_VERSION(COMEDI_MAJORVERSION,COMEDI_MINORVERSION,COMEDI_MICROVERSION)
+#define COMEDI_RELEASE VERSION
+
+#define COMEDI_INITCLEANUP_NOMODULE(x)					\
+	static int __init x ## _init_module(void)			\
+		{return comedi_driver_register(&(x));}			\
+	static void __exit x ## _cleanup_module(void)			\
+		{comedi_driver_unregister(&(x));} 			\
+	module_init(x ## _init_module);					\
+	module_exit(x ## _cleanup_module);					\
+
+#define COMEDI_MODULE_MACROS						\
+	MODULE_AUTHOR("Comedi http://www.comedi.org");		\
+	MODULE_DESCRIPTION("Comedi low-level driver");			\
+	MODULE_LICENSE("GPL");						\
+
+#define COMEDI_INITCLEANUP(x)						\
+	COMEDI_MODULE_MACROS		\
+	COMEDI_INITCLEANUP_NOMODULE(x)
+
+#define COMEDI_PCI_INITCLEANUP_NOMODULE(comedi_driver, pci_id_table) \
+	static int __devinit comedi_driver ## _pci_probe(struct pci_dev *dev, \
+		const struct pci_device_id *ent) \
+	{ \
+		return comedi_pci_auto_config(dev, comedi_driver.driver_name); \
+	} \
+	static void __devexit comedi_driver ## _pci_remove(struct pci_dev *dev) \
+	{ \
+		comedi_pci_auto_unconfig(dev); \
+	} \
+	static struct pci_driver comedi_driver ## _pci_driver = \
+	{ \
+		.id_table = pci_id_table, \
+		.probe = & comedi_driver ## _pci_probe, \
+		.remove = __devexit_p(& comedi_driver ## _pci_remove) \
+	}; \
+	static int __init comedi_driver ## _init_module(void) \
+	{ \
+		int retval; \
+		retval = comedi_driver_register(& comedi_driver); \
+		if(retval < 0) return retval; \
+		comedi_driver ## _pci_driver.name = (char*)comedi_driver.driver_name; \
+		return pci_register_driver(& comedi_driver ## _pci_driver); \
+	} \
+	static void __exit comedi_driver ## _cleanup_module(void) \
+	{ \
+		pci_unregister_driver(& comedi_driver ## _pci_driver); \
+		comedi_driver_unregister(& comedi_driver); \
+	} \
+	module_init(comedi_driver ## _init_module); \
+	module_exit(comedi_driver ## _cleanup_module);
+
+#define COMEDI_PCI_INITCLEANUP(comedi_driver, pci_id_table) \
+	COMEDI_MODULE_MACROS \
+	COMEDI_PCI_INITCLEANUP_NOMODULE(comedi_driver, pci_id_table)
+
+#define PCI_VENDOR_ID_INOVA		0x104c
+#define PCI_VENDOR_ID_NATINST		0x1093
+#define PCI_VENDOR_ID_DATX		0x1116
+#define PCI_VENDOR_ID_COMPUTERBOARDS	0x1307
+#define PCI_VENDOR_ID_ADVANTECH		0x13fe
+#define PCI_VENDOR_ID_RTD		0x1435
+#define PCI_VENDOR_ID_AMPLICON		0x14dc
+#define PCI_VENDOR_ID_ADLINK		0x144a
+#define PCI_VENDOR_ID_ICP		0x104c
+#define PCI_VENDOR_ID_CONTEC		0x1221
+#define PCI_VENDOR_ID_MEILHAUS		0x1402
+
+#define COMEDI_NUM_MINORS 0x100
+#define COMEDI_NUM_LEGACY_MINORS 0x10
+#define COMEDI_NUM_BOARD_MINORS 0x30
+#define COMEDI_FIRST_SUBDEVICE_MINOR COMEDI_NUM_BOARD_MINORS
+
+typedef struct comedi_device_struct comedi_device;
+typedef struct comedi_subdevice_struct comedi_subdevice;
+typedef struct comedi_async_struct comedi_async;
+typedef struct comedi_driver_struct comedi_driver;
+typedef struct comedi_lrange_struct comedi_lrange;
+
+typedef struct device device_create_result_type;
+
+#define COMEDI_DEVICE_CREATE(cs, parent, devt, drvdata, device, fmt...) \
+	device_create(cs, ((parent) ? (parent) : (device)), devt, drvdata, fmt)
+
+struct comedi_subdevice_struct {
+	comedi_device *device;
+	int type;
+	int n_chan;
+	volatile int subdev_flags;
+	int len_chanlist;	/* maximum length of channel/gain list */
+
+	void *private;
+
+	comedi_async *async;
+
+	void *lock;
+	void *busy;
+	unsigned runflags;
+	spinlock_t spin_lock;
+
+	int io_bits;
+
+	lsampl_t maxdata;	/* if maxdata==0, use list */
+	const lsampl_t *maxdata_list;	/* list is channel specific */
+
+	unsigned int flags;
+	const unsigned int *flaglist;
+
+	unsigned int settling_time_0;
+
+	const comedi_lrange *range_table;
+	const comedi_lrange *const *range_table_list;
+
+	unsigned int *chanlist;	/* driver-owned chanlist (not used) */
+
+	int (*insn_read) (comedi_device *, comedi_subdevice *, comedi_insn *,
+		lsampl_t *);
+	int (*insn_write) (comedi_device *, comedi_subdevice *, comedi_insn *,
+		lsampl_t *);
+	int (*insn_bits) (comedi_device *, comedi_subdevice *, comedi_insn *,
+		lsampl_t *);
+	int (*insn_config) (comedi_device *, comedi_subdevice *, comedi_insn *,
+		lsampl_t *);
+
+	int (*do_cmd) (comedi_device *, comedi_subdevice *);
+	int (*do_cmdtest) (comedi_device *, comedi_subdevice *, comedi_cmd *);
+	int (*poll) (comedi_device *, comedi_subdevice *);
+	int (*cancel) (comedi_device *, comedi_subdevice *);
+	//int (*do_lock)(comedi_device *,comedi_subdevice *);
+	//int (*do_unlock)(comedi_device *,comedi_subdevice *);
+
+	/* called when the buffer changes */
+	int (*buf_change) (comedi_device * dev, comedi_subdevice * s,
+		unsigned long new_size);
+
+	void (*munge) (comedi_device * dev, comedi_subdevice * s, void *data,
+		unsigned int num_bytes, unsigned int start_chan_index);
+	enum dma_data_direction async_dma_dir;
+
+	unsigned int state;
+
+	device_create_result_type *class_dev;
+	int minor;
+};
+
+struct comedi_buf_page {
+	void *virt_addr;
+	dma_addr_t dma_addr;
+};
+
+struct comedi_async_struct {
+	comedi_subdevice *subdevice;
+
+	void *prealloc_buf;	/* pre-allocated buffer */
+	unsigned int prealloc_bufsz;	/* buffer size, in bytes */
+	struct comedi_buf_page *buf_page_list;	/* virtual and dma address of each page */
+	unsigned n_buf_pages;	/* num elements in buf_page_list */
+
+	unsigned int max_bufsize;	/* maximum buffer size, bytes */
+	unsigned int mmap_count;	/* current number of mmaps of prealloc_buf */
+
+	unsigned int buf_write_count;	/* byte count for writer (write completed) */
+	unsigned int buf_write_alloc_count;	/* byte count for writer (allocated for writing) */
+	unsigned int buf_read_count;	/* byte count for reader (read completed) */
+	unsigned int buf_read_alloc_count;	/* byte count for reader (allocated for reading) */
+
+	unsigned int buf_write_ptr;	/* buffer marker for writer */
+	unsigned int buf_read_ptr;	/* buffer marker for reader */
+
+	unsigned int cur_chan;	/* useless channel marker for interrupt */
+	/* number of bytes that have been received for current scan */
+	unsigned int scan_progress;
+	/* keeps track of where we are in chanlist as for munging */
+	unsigned int munge_chan;
+	/* number of bytes that have been munged */
+	unsigned int munge_count;
+	/* buffer marker for munging */
+	unsigned int munge_ptr;
+
+	unsigned int events;	/* events that have occurred */
+
+	comedi_cmd cmd;
+
+	wait_queue_head_t wait_head;
+
+	// callback stuff
+	unsigned int cb_mask;
+	int (*cb_func) (unsigned int flags, void *);
+	void *cb_arg;
+
+	int (*inttrig) (comedi_device * dev, comedi_subdevice * s,
+		unsigned int x);
+};
+
+struct comedi_driver_struct {
+	struct comedi_driver_struct *next;
+
+	const char *driver_name;
+	struct module *module;
+	int (*attach) (comedi_device *, comedi_devconfig *);
+	int (*detach) (comedi_device *);
+
+	/* number of elements in board_name and board_id arrays */
+	unsigned int num_names;
+	const char *const *board_name;
+	/* offset in bytes from one board name pointer to the next */
+	int offset;
+};
+
+struct comedi_device_struct {
+	int use_count;
+	comedi_driver *driver;
+	void *private;
+
+	device_create_result_type *class_dev;
+	int minor;
+	/* hw_dev is passed to dma_alloc_coherent when allocating async buffers for subdevices
+	   that have async_dma_dir set to something other than DMA_NONE */
+	struct device *hw_dev;
+
+	const char *board_name;
+	const void *board_ptr;
+	int attached;
+	int rt;
+	spinlock_t spinlock;
+	struct mutex mutex;
+	int in_request_module;
+
+	int n_subdevices;
+	comedi_subdevice *subdevices;
+
+	/* dumb */
+	unsigned long iobase;
+	unsigned int irq;
+
+	comedi_subdevice *read_subdev;
+	comedi_subdevice *write_subdev;
+
+	struct fasync_struct *async_queue;
+
+	void (*open) (comedi_device * dev);
+	void (*close) (comedi_device * dev);
+};
+
+struct comedi_device_file_info {
+	comedi_device *device;
+	comedi_subdevice *read_subdevice;
+	comedi_subdevice *write_subdevice;
+};
+
+#ifdef CONFIG_COMEDI_DEBUG
+extern int comedi_debug;
+#else
+static const int comedi_debug = 0;
+#endif
+
+/*
+ * function prototypes
+ */
+
+void comedi_event(comedi_device * dev, comedi_subdevice * s);
+void comedi_error(const comedi_device * dev, const char *s);
+
+/* we can expand the number of bits used to encode devices/subdevices into
+ the minor number soon, after more distros support > 8 bit minor numbers
+ (like after Debian Etch gets released) */
+enum comedi_minor_bits {
+	COMEDI_DEVICE_MINOR_MASK = 0xf,
+	COMEDI_SUBDEVICE_MINOR_MASK = 0xf0
+};
+static const unsigned COMEDI_SUBDEVICE_MINOR_SHIFT = 4;
+static const unsigned COMEDI_SUBDEVICE_MINOR_OFFSET = 1;
+
+struct comedi_device_file_info* comedi_get_device_file_info(unsigned minor);
+
+static inline comedi_subdevice* comedi_get_read_subdevice(const struct comedi_device_file_info *info)
+{
+	if(info->read_subdevice) return info->read_subdevice;
+	if(info->device == NULL) return NULL;
+	return info->device->read_subdev;
+}
+
+static inline comedi_subdevice* comedi_get_write_subdevice(const struct comedi_device_file_info *info)
+{
+	if(info->write_subdevice) return info->write_subdevice;
+	if(info->device == NULL) return NULL;
+	return info->device->write_subdev;
+}
+
+void comedi_device_detach(comedi_device * dev);
+int comedi_device_attach(comedi_device * dev, comedi_devconfig * it);
+int comedi_driver_register(comedi_driver *);
+int comedi_driver_unregister(comedi_driver *);
+
+void init_polling(void);
+void cleanup_polling(void);
+void start_polling(comedi_device *);
+void stop_polling(comedi_device *);
+
+int comedi_buf_alloc(comedi_device * dev, comedi_subdevice * s, unsigned long
+	new_size);
+
+#ifdef CONFIG_PROC_FS
+void comedi_proc_init(void);
+void comedi_proc_cleanup(void);
+#else
+static inline void comedi_proc_init(void)
+{
+}
+static inline void comedi_proc_cleanup(void)
+{
+}
+#endif
+
+/* subdevice runflags */
+enum subdevice_runflags {
+	SRF_USER = 0x00000001,
+	SRF_RT = 0x00000002,
+	/* indicates an COMEDI_CB_ERROR event has occurred since the last command was started */
+	SRF_ERROR = 0x00000004,
+	SRF_RUNNING = 0x08000000
+};
+
+/*
+   various internal comedi functions
+ */
+
+int do_rangeinfo_ioctl(comedi_device * dev, comedi_rangeinfo * arg);
+int check_chanlist(comedi_subdevice * s, int n, unsigned int *chanlist);
+void comedi_set_subdevice_runflags(comedi_subdevice * s, unsigned mask,
+	unsigned bits);
+unsigned comedi_get_subdevice_runflags(comedi_subdevice * s);
+int insn_inval(comedi_device * dev, comedi_subdevice * s,
+	comedi_insn * insn, lsampl_t * data);
+
+/* range stuff */
+
+#define RANGE(a,b)		{(a)*1e6,(b)*1e6,0}
+#define RANGE_ext(a,b)		{(a)*1e6,(b)*1e6,RF_EXTERNAL}
+#define RANGE_mA(a,b)		{(a)*1e6,(b)*1e6,UNIT_mA}
+#define RANGE_unitless(a,b)	{(a)*1e6,(b)*1e6,0}	/* XXX */
+#define BIP_RANGE(a)		{-(a)*1e6,(a)*1e6,0}
+#define UNI_RANGE(a)		{0,(a)*1e6,0}
+
+extern const comedi_lrange range_bipolar10;
+extern const comedi_lrange range_bipolar5;
+extern const comedi_lrange range_bipolar2_5;
+extern const comedi_lrange range_unipolar10;
+extern const comedi_lrange range_unipolar5;
+extern const comedi_lrange range_unknown;
+
+#define range_digital		range_unipolar5
+
+#if __GNUC__ >= 3
+#define GCC_ZERO_LENGTH_ARRAY
+#else
+#define GCC_ZERO_LENGTH_ARRAY 0
+#endif
+
+struct comedi_lrange_struct {
+	int length;
+	comedi_krange range[GCC_ZERO_LENGTH_ARRAY];
+};
+
+/* some silly little inline functions */
+
+static inline int alloc_subdevices(comedi_device * dev,
+	unsigned int num_subdevices)
+{
+	unsigned i;
+
+	dev->n_subdevices = num_subdevices;
+	dev->subdevices =
+		kcalloc(num_subdevices, sizeof(comedi_subdevice), GFP_KERNEL);
+	if (!dev->subdevices)
+		return -ENOMEM;
+	for (i = 0; i < num_subdevices; ++i) {
+		dev->subdevices[i].device = dev;
+		dev->subdevices[i].async_dma_dir = DMA_NONE;
+		spin_lock_init(&dev->subdevices[i].spin_lock);
+		dev->subdevices[i].minor = -1;
+	}
+	return 0;
+}
+
+static inline int alloc_private(comedi_device * dev, int size)
+{
+	dev->private = kzalloc(size, GFP_KERNEL);
+	if (!dev->private)
+		return -ENOMEM;
+	return 0;
+}
+
+static inline unsigned int bytes_per_sample(const comedi_subdevice * subd)
+{
+	if (subd->subdev_flags & SDF_LSAMPL)
+		return sizeof(lsampl_t);
+	else
+		return sizeof(sampl_t);
+}
+
+/* must be used in attach to set dev->hw_dev if you wish to dma directly
+into comedi's buffer */
+static inline void comedi_set_hw_dev(comedi_device * dev, struct device *hw_dev)
+{
+	if (dev->hw_dev) {
+		put_device(dev->hw_dev);
+	}
+	dev->hw_dev = hw_dev;
+	if (dev->hw_dev) {
+		dev->hw_dev = get_device(dev->hw_dev);
+		BUG_ON(dev->hw_dev == NULL);
+	}
+}
+
+int comedi_buf_put(comedi_async * async, sampl_t x);
+int comedi_buf_get(comedi_async * async, sampl_t * x);
+
+unsigned int comedi_buf_write_n_available(comedi_async * async);
+unsigned int comedi_buf_write_alloc(comedi_async * async, unsigned int nbytes);
+unsigned int comedi_buf_write_alloc_strict(comedi_async * async,
+	unsigned int nbytes);
+unsigned comedi_buf_write_free(comedi_async * async, unsigned int nbytes);
+unsigned comedi_buf_read_alloc(comedi_async * async, unsigned nbytes);
+unsigned comedi_buf_read_free(comedi_async * async, unsigned int nbytes);
+unsigned int comedi_buf_read_n_available(comedi_async * async);
+void comedi_buf_memcpy_to(comedi_async * async, unsigned int offset,
+	const void *source, unsigned int num_bytes);
+void comedi_buf_memcpy_from(comedi_async * async, unsigned int offset,
+	void *destination, unsigned int num_bytes);
+static inline unsigned comedi_buf_write_n_allocated(comedi_async * async)
+{
+	return async->buf_write_alloc_count - async->buf_write_count;
+}
+static inline unsigned comedi_buf_read_n_allocated(comedi_async * async)
+{
+	return async->buf_read_alloc_count - async->buf_read_count;
+}
+
+void comedi_reset_async_buf(comedi_async * async);
+
+static inline void *comedi_aux_data(int options[], int n)
+{
+	unsigned long address;
+	unsigned long addressLow;
+	int bit_shift;
+	if (sizeof(int) >= sizeof(void *))
+		address = options[COMEDI_DEVCONF_AUX_DATA_LO];
+	else {
+		address = options[COMEDI_DEVCONF_AUX_DATA_HI];
+		bit_shift = sizeof(int) * 8;
+		address <<= bit_shift;
+		addressLow = options[COMEDI_DEVCONF_AUX_DATA_LO];
+		addressLow &= (1UL << bit_shift) - 1;
+		address |= addressLow;
+	}
+	if (n >= 1)
+		address += options[COMEDI_DEVCONF_AUX_DATA0_LENGTH];
+	if (n >= 2)
+		address += options[COMEDI_DEVCONF_AUX_DATA1_LENGTH];
+	if (n >= 3)
+		address += options[COMEDI_DEVCONF_AUX_DATA2_LENGTH];
+	BUG_ON(n > 3);
+	return (void *)address;
+}
+
+int comedi_alloc_board_minor(struct device *hardware_device);
+void comedi_free_board_minor(unsigned minor);
+int comedi_alloc_subdevice_minor(comedi_device *dev, comedi_subdevice *s);
+void comedi_free_subdevice_minor(comedi_subdevice *s);
+int comedi_pci_auto_config(struct pci_dev *pcidev, const char *board_name);
+void comedi_pci_auto_unconfig(struct pci_dev *pcidev);
+
+//#ifdef CONFIG_COMEDI_RT
+#include "comedi_rt.h"
+//#endif
+
+#endif /* _COMEDIDEV_H */
diff --git a/drivers/staging/comedi/comedilib.h b/drivers/staging/comedi/comedilib.h
new file mode 100644
index 0000000..e381389
--- /dev/null
+++ b/drivers/staging/comedi/comedilib.h
@@ -0,0 +1,192 @@
+/*
+    linux/include/comedilib.h
+    header file for kcomedilib
+
+    COMEDI - Linux Control and Measurement Device Interface
+    Copyright (C) 1998-2001 David A. Schleef <ds@schleef.org>
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+*/
+
+#ifndef _LINUX_COMEDILIB_H
+#define _LINUX_COMEDILIB_H
+
+#include <linux/comedi.h>
+
+/* Kernel internal stuff.  Needed by real-time modules and such. */
+
+#ifndef __KERNEL__
+#error linux/comedilib.h should not be included by non-kernel-space code
+#endif
+
+/* exported functions */
+
+#ifndef KCOMEDILIB_DEPRECATED
+
+typedef void comedi_t;
+
+/* these functions may not be called at real-time priority */
+
+comedi_t *comedi_open(const char *path);
+int comedi_close(comedi_t * dev);
+
+/* these functions may be called at any priority, but may fail at
+   real-time priority */
+
+int comedi_lock(comedi_t * dev, unsigned int subdev);
+int comedi_unlock(comedi_t * dev, unsigned int subdev);
+
+/* these functions may be called at any priority, but you must hold
+   the lock for the subdevice */
+
+int comedi_loglevel(int loglevel);
+void comedi_perror(const char *s);
+char *comedi_strerror(int errnum);
+int comedi_errno(void);
+int comedi_fileno(comedi_t * dev);
+
+int comedi_cancel(comedi_t * dev, unsigned int subdev);
+int comedi_register_callback(comedi_t * dev, unsigned int subdev,
+	unsigned int mask, int (*cb) (unsigned int, void *), void *arg);
+
+int comedi_command(comedi_t * dev, comedi_cmd * cmd);
+int comedi_command_test(comedi_t * dev, comedi_cmd * cmd);
+int comedi_trigger(comedi_t * dev, unsigned int subdev, comedi_trig * it);
+int __comedi_trigger(comedi_t * dev, unsigned int subdev, comedi_trig * it);
+int comedi_data_write(comedi_t * dev, unsigned int subdev, unsigned int chan,
+	unsigned int range, unsigned int aref, lsampl_t data);
+int comedi_data_read(comedi_t * dev, unsigned int subdev, unsigned int chan,
+	unsigned int range, unsigned int aref, lsampl_t * data);
+int comedi_data_read_hint(comedi_t * dev, unsigned int subdev,
+	unsigned int chan, unsigned int range, unsigned int aref);
+int comedi_data_read_delayed(comedi_t * dev, unsigned int subdev,
+	unsigned int chan, unsigned int range, unsigned int aref,
+	lsampl_t * data, unsigned int nano_sec);
+int comedi_dio_config(comedi_t * dev, unsigned int subdev, unsigned int chan,
+	unsigned int io);
+int comedi_dio_read(comedi_t * dev, unsigned int subdev, unsigned int chan,
+	unsigned int *val);
+int comedi_dio_write(comedi_t * dev, unsigned int subdev, unsigned int chan,
+	unsigned int val);
+int comedi_dio_bitfield(comedi_t * dev, unsigned int subdev, unsigned int mask,
+	unsigned int *bits);
+int comedi_get_n_subdevices(comedi_t * dev);
+int comedi_get_version_code(comedi_t * dev);
+const char *comedi_get_driver_name(comedi_t * dev);
+const char *comedi_get_board_name(comedi_t * dev);
+int comedi_get_subdevice_type(comedi_t * dev, unsigned int subdevice);
+int comedi_find_subdevice_by_type(comedi_t * dev, int type, unsigned int subd);
+int comedi_get_n_channels(comedi_t * dev, unsigned int subdevice);
+lsampl_t comedi_get_maxdata(comedi_t * dev, unsigned int subdevice, unsigned
+	int chan);
+int comedi_get_n_ranges(comedi_t * dev, unsigned int subdevice, unsigned int
+	chan);
+int comedi_do_insn(comedi_t * dev, comedi_insn * insn);
+int comedi_poll(comedi_t * dev, unsigned int subdev);
+
+/* DEPRECATED functions */
+int comedi_get_rangetype(comedi_t * dev, unsigned int subdevice,
+	unsigned int chan);
+
+/* ALPHA functions */
+unsigned int comedi_get_subdevice_flags(comedi_t * dev, unsigned int subdevice);
+int comedi_get_len_chanlist(comedi_t * dev, unsigned int subdevice);
+int comedi_get_krange(comedi_t * dev, unsigned int subdevice, unsigned int
+	chan, unsigned int range, comedi_krange * krange);
+unsigned int comedi_get_buf_head_pos(comedi_t * dev, unsigned int subdevice);
+int comedi_set_user_int_count(comedi_t * dev, unsigned int subdevice,
+	unsigned int buf_user_count);
+int comedi_map(comedi_t * dev, unsigned int subdev, void *ptr);
+int comedi_unmap(comedi_t * dev, unsigned int subdev);
+int comedi_get_buffer_size(comedi_t * dev, unsigned int subdev);
+int comedi_mark_buffer_read(comedi_t * dev, unsigned int subdevice,
+	unsigned int num_bytes);
+int comedi_mark_buffer_written(comedi_t * d, unsigned int subdevice,
+	unsigned int num_bytes);
+int comedi_get_buffer_contents(comedi_t * dev, unsigned int subdevice);
+int comedi_get_buffer_offset(comedi_t * dev, unsigned int subdevice);
+
+#else
+
+/* these functions may not be called at real-time priority */
+
+int comedi_open(unsigned int minor);
+void comedi_close(unsigned int minor);
+
+/* these functions may be called at any priority, but may fail at
+   real-time priority */
+
+int comedi_lock(unsigned int minor, unsigned int subdev);
+int comedi_unlock(unsigned int minor, unsigned int subdev);
+
+/* these functions may be called at any priority, but you must hold
+   the lock for the subdevice */
+
+int comedi_cancel(unsigned int minor, unsigned int subdev);
+int comedi_register_callback(unsigned int minor, unsigned int subdev,
+	unsigned int mask, int (*cb) (unsigned int, void *), void *arg);
+
+int comedi_command(unsigned int minor, comedi_cmd * cmd);
+int comedi_command_test(unsigned int minor, comedi_cmd * cmd);
+int comedi_trigger(unsigned int minor, unsigned int subdev, comedi_trig * it);
+int __comedi_trigger(unsigned int minor, unsigned int subdev, comedi_trig * it);
+int comedi_data_write(unsigned int dev, unsigned int subdev, unsigned int chan,
+	unsigned int range, unsigned int aref, lsampl_t data);
+int comedi_data_read(unsigned int dev, unsigned int subdev, unsigned int chan,
+	unsigned int range, unsigned int aref, lsampl_t * data);
+int comedi_dio_config(unsigned int dev, unsigned int subdev, unsigned int chan,
+	unsigned int io);
+int comedi_dio_read(unsigned int dev, unsigned int subdev, unsigned int chan,
+	unsigned int *val);
+int comedi_dio_write(unsigned int dev, unsigned int subdev, unsigned int chan,
+	unsigned int val);
+int comedi_dio_bitfield(unsigned int dev, unsigned int subdev,
+	unsigned int mask, unsigned int *bits);
+int comedi_get_n_subdevices(unsigned int dev);
+int comedi_get_version_code(unsigned int dev);
+char *comedi_get_driver_name(unsigned int dev);
+char *comedi_get_board_name(unsigned int minor);
+int comedi_get_subdevice_type(unsigned int minor, unsigned int subdevice);
+int comedi_find_subdevice_by_type(unsigned int minor, int type,
+	unsigned int subd);
+int comedi_get_n_channels(unsigned int minor, unsigned int subdevice);
+lsampl_t comedi_get_maxdata(unsigned int minor, unsigned int subdevice, unsigned
+	int chan);
+int comedi_get_n_ranges(unsigned int minor, unsigned int subdevice, unsigned int
+	chan);
+int comedi_do_insn(unsigned int minor, comedi_insn * insn);
+int comedi_poll(unsigned int minor, unsigned int subdev);
+
+/* DEPRECATED functions */
+int comedi_get_rangetype(unsigned int minor, unsigned int subdevice,
+	unsigned int chan);
+
+/* ALPHA functions */
+unsigned int comedi_get_subdevice_flags(unsigned int minor, unsigned int
+	subdevice);
+int comedi_get_len_chanlist(unsigned int minor, unsigned int subdevice);
+int comedi_get_krange(unsigned int minor, unsigned int subdevice, unsigned int
+	chan, unsigned int range, comedi_krange * krange);
+unsigned int comedi_get_buf_head_pos(unsigned int minor, unsigned int
+	subdevice);
+int comedi_set_user_int_count(unsigned int minor, unsigned int subdevice,
+	unsigned int buf_user_count);
+int comedi_map(unsigned int minor, unsigned int subdev, void **ptr);
+int comedi_unmap(unsigned int minor, unsigned int subdev);
+
+#endif
+
+#endif
diff --git a/drivers/staging/comedi/drivers.c b/drivers/staging/comedi/drivers.c
new file mode 100644
index 0000000..06372b2
--- /dev/null
+++ b/drivers/staging/comedi/drivers.c
@@ -0,0 +1,846 @@
+/*
+    module/drivers.c
+    functions for manipulating drivers
+
+    COMEDI - Linux Control and Measurement Device Interface
+    Copyright (C) 1997-2000 David A. Schleef <ds@schleef.org>
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+*/
+
+#define _GNU_SOURCE
+
+#define __NO_VERSION__
+#include "comedi_fops.h"
+#include <linux/device.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/fcntl.h>
+#include <linux/delay.h>
+#include <linux/ioport.h>
+#include <linux/mm.h>
+#include <linux/slab.h>
+#include "comedidev.h"
+#include "wrapper.h"
+#include <linux/highmem.h>	/* for SuSE brokenness */
+#include <linux/vmalloc.h>
+#include <linux/cdev.h>
+#include <linux/dma-mapping.h>
+
+#include <asm/io.h>
+#include <asm/system.h>
+
+static int postconfig(comedi_device * dev);
+static int insn_rw_emulate_bits(comedi_device * dev, comedi_subdevice * s,
+	comedi_insn * insn, lsampl_t * data);
+static void *comedi_recognize(comedi_driver * driv, const char *name);
+static void comedi_report_boards(comedi_driver * driv);
+static int poll_invalid(comedi_device * dev, comedi_subdevice * s);
+int comedi_buf_alloc(comedi_device * dev, comedi_subdevice * s,
+	unsigned long new_size);
+
+comedi_driver *comedi_drivers;
+
+int comedi_modprobe(int minor)
+{
+	return -EINVAL;
+}
+
+static void cleanup_device(comedi_device * dev)
+{
+	int i;
+	comedi_subdevice *s;
+
+	if (dev->subdevices) {
+		for (i = 0; i < dev->n_subdevices; i++) {
+			s = dev->subdevices + i;
+			comedi_free_subdevice_minor(s);
+			if (s->async) {
+				comedi_buf_alloc(dev, s, 0);
+				kfree(s->async);
+			}
+		}
+		kfree(dev->subdevices);
+		dev->subdevices = NULL;
+		dev->n_subdevices = 0;
+	}
+	if (dev->private) {
+		kfree(dev->private);
+		dev->private = NULL;
+	}
+	dev->driver = 0;
+	dev->board_name = NULL;
+	dev->board_ptr = NULL;
+	dev->iobase = 0;
+	dev->irq = 0;
+	dev->read_subdev = NULL;
+	dev->write_subdev = NULL;
+	dev->open = NULL;
+	dev->close = NULL;
+	comedi_set_hw_dev(dev, NULL);
+}
+
+static void __comedi_device_detach(comedi_device * dev)
+{
+	dev->attached = 0;
+	if (dev->driver) {
+		dev->driver->detach(dev);
+	} else {
+		printk("BUG: dev->driver=NULL in comedi_device_detach()\n");
+	}
+	cleanup_device(dev);
+}
+
+void comedi_device_detach(comedi_device * dev)
+{
+	if (!dev->attached)
+		return;
+	__comedi_device_detach(dev);
+}
+
+int comedi_device_attach(comedi_device * dev, comedi_devconfig * it)
+{
+	comedi_driver *driv;
+	int ret;
+
+	if (dev->attached)
+		return -EBUSY;
+
+	for (driv = comedi_drivers; driv; driv = driv->next) {
+		if (!try_module_get(driv->module)) {
+			printk("comedi: failed to increment module count, skipping\n");
+			continue;
+		}
+		if (driv->num_names) {
+			dev->board_ptr = comedi_recognize(driv, it->board_name);
+			if (dev->board_ptr == NULL) {
+				module_put(driv->module);
+				continue;
+			}
+		} else {
+			if (strcmp(driv->driver_name, it->board_name)) {
+				module_put(driv->module);
+				continue;
+			}
+		}
+		//initialize dev->driver here so comedi_error() can be called from attach
+		dev->driver = driv;
+		ret = driv->attach(dev, it);
+		if (ret < 0) {
+			module_put(dev->driver->module);
+			__comedi_device_detach(dev);
+			return ret;
+		}
+		goto attached;
+	}
+
+	// recognize has failed if we get here
+	// report valid board names before returning error
+	for (driv = comedi_drivers; driv; driv = driv->next) {
+		if (!try_module_get(driv->module)) {
+			printk("comedi: failed to increment module count\n");
+			continue;
+		}
+		comedi_report_boards(driv);
+		module_put(driv->module);
+	}
+	return -EIO;
+
+attached:
+	/* do a little post-config cleanup */
+	ret = postconfig(dev);
+	module_put(dev->driver->module);
+	if (ret < 0) {
+		__comedi_device_detach(dev);
+		return ret;
+	}
+
+	if (!dev->board_name) {
+		printk("BUG: dev->board_name=<%p>\n", dev->board_name);
+		dev->board_name = "BUG";
+	}
+	smp_wmb();
+	dev->attached = 1;
+
+	return 0;
+}
+
+int comedi_driver_register(comedi_driver * driver)
+{
+	driver->next = comedi_drivers;
+	comedi_drivers = driver;
+
+	return 0;
+}
+
+int comedi_driver_unregister(comedi_driver * driver)
+{
+	comedi_driver *prev;
+	int i;
+
+	/* check for devices using this driver */
+	for (i = 0; i < COMEDI_NUM_BOARD_MINORS; i++) {
+		struct comedi_device_file_info *dev_file_info = comedi_get_device_file_info(i);
+		comedi_device *dev;
+
+		if(dev_file_info == NULL) continue;
+		dev = dev_file_info->device;
+
+		mutex_lock(&dev->mutex);
+		if (dev->attached && dev->driver == driver) {
+			if (dev->use_count)
+				printk("BUG! detaching device with use_count=%d\n", dev->use_count);
+			comedi_device_detach(dev);
+		}
+		mutex_unlock(&dev->mutex);
+	}
+
+	if (comedi_drivers == driver) {
+		comedi_drivers = driver->next;
+		return 0;
+	}
+
+	for (prev = comedi_drivers; prev->next; prev = prev->next) {
+		if (prev->next == driver) {
+			prev->next = driver->next;
+			return 0;
+		}
+	}
+	return -EINVAL;
+}
+
+static int postconfig(comedi_device * dev)
+{
+	int i;
+	comedi_subdevice *s;
+	comedi_async *async = NULL;
+	int ret;
+
+	for (i = 0; i < dev->n_subdevices; i++) {
+		s = dev->subdevices + i;
+
+		if (s->type == COMEDI_SUBD_UNUSED)
+			continue;
+
+		if (s->len_chanlist == 0)
+			s->len_chanlist = 1;
+
+		if (s->do_cmd) {
+			BUG_ON((s->subdev_flags & (SDF_CMD_READ |
+				SDF_CMD_WRITE)) == 0);
+			BUG_ON(!s->do_cmdtest);
+
+			async = kzalloc(sizeof(comedi_async), GFP_KERNEL);
+			if (async == NULL) {
+				printk("failed to allocate async struct\n");
+				return -ENOMEM;
+			}
+			init_waitqueue_head(&async->wait_head);
+			async->subdevice = s;
+			s->async = async;
+
+#define DEFAULT_BUF_MAXSIZE (64*1024)
+#define DEFAULT_BUF_SIZE (64*1024)
+
+			async->max_bufsize = DEFAULT_BUF_MAXSIZE;
+
+			async->prealloc_buf = NULL;
+			async->prealloc_bufsz = 0;
+			if (comedi_buf_alloc(dev, s, DEFAULT_BUF_SIZE) < 0) {
+				printk("Buffer allocation failed\n");
+				return -ENOMEM;
+			}
+			if (s->buf_change) {
+				ret = s->buf_change(dev, s, DEFAULT_BUF_SIZE);
+				if (ret < 0)
+					return ret;
+			}
+			comedi_alloc_subdevice_minor(dev, s);
+		}
+
+		if (!s->range_table && !s->range_table_list)
+			s->range_table = &range_unknown;
+
+		if (!s->insn_read && s->insn_bits)
+			s->insn_read = insn_rw_emulate_bits;
+		if (!s->insn_write && s->insn_bits)
+			s->insn_write = insn_rw_emulate_bits;
+
+		if (!s->insn_read)
+			s->insn_read = insn_inval;
+		if (!s->insn_write)
+			s->insn_write = insn_inval;
+		if (!s->insn_bits)
+			s->insn_bits = insn_inval;
+		if (!s->insn_config)
+			s->insn_config = insn_inval;
+
+		if (!s->poll)
+			s->poll = poll_invalid;
+	}
+
+	return 0;
+}
+
+// generic recognize function for drivers that register their supported board names
+void *comedi_recognize(comedi_driver * driv, const char *name)
+{
+	unsigned i;
+	const char *const *name_ptr = driv->board_name;
+	for (i = 0; i < driv->num_names; i++) {
+		if (strcmp(*name_ptr, name) == 0)
+			return (void *)name_ptr;
+		name_ptr =
+			(const char *const *)((const char *)name_ptr +
+			driv->offset);
+	}
+
+	return NULL;
+}
+
+void comedi_report_boards(comedi_driver * driv)
+{
+	unsigned int i;
+	const char *const *name_ptr;
+
+	printk("comedi: valid board names for %s driver are:\n",
+		driv->driver_name);
+
+	name_ptr = driv->board_name;
+	for (i = 0; i < driv->num_names; i++) {
+		printk(" %s\n", *name_ptr);
+		name_ptr = (const char **)((char *)name_ptr + driv->offset);
+	}
+
+	if (driv->num_names == 0)
+		printk(" %s\n", driv->driver_name);
+}
+
+static int poll_invalid(comedi_device * dev, comedi_subdevice * s)
+{
+	return -EINVAL;
+}
+
+int insn_inval(comedi_device * dev, comedi_subdevice * s,
+	comedi_insn * insn, lsampl_t * data)
+{
+	return -EINVAL;
+}
+
+static int insn_rw_emulate_bits(comedi_device * dev, comedi_subdevice * s,
+	comedi_insn * insn, lsampl_t * data)
+{
+	comedi_insn new_insn;
+	int ret;
+	static const unsigned channels_per_bitfield = 32;
+
+	unsigned chan = CR_CHAN(insn->chanspec);
+	const unsigned base_bitfield_channel =
+		(chan < channels_per_bitfield) ? 0 : chan;
+	lsampl_t new_data[2];
+	memset(new_data, 0, sizeof(new_data));
+	memset(&new_insn, 0, sizeof(new_insn));
+	new_insn.insn = INSN_BITS;
+	new_insn.chanspec = base_bitfield_channel;
+	new_insn.n = 2;
+	new_insn.data = new_data;
+	new_insn.subdev = insn->subdev;
+
+	if (insn->insn == INSN_WRITE) {
+		if (!(s->subdev_flags & SDF_WRITABLE))
+			return -EINVAL;
+		new_data[0] = 1 << (chan - base_bitfield_channel);	/* mask */
+		new_data[1] = data[0] ? (1 << (chan - base_bitfield_channel)) : 0;	/* bits */
+	}
+
+	ret = s->insn_bits(dev, s, &new_insn, new_data);
+	if (ret < 0)
+		return ret;
+
+	if (insn->insn == INSN_READ) {
+		data[0] = (new_data[1] >> (chan - base_bitfield_channel)) & 1;
+	}
+
+	return 1;
+}
+
+static inline unsigned long uvirt_to_kva(pgd_t * pgd, unsigned long adr)
+{
+	unsigned long ret = 0UL;
+	pmd_t *pmd;
+	pte_t *ptep, pte;
+	pud_t *pud;
+
+	if (!pgd_none(*pgd)) {
+		pud = pud_offset(pgd, adr);
+		pmd = pmd_offset(pud, adr);
+		if (!pmd_none(*pmd)) {
+			ptep = pte_offset_kernel(pmd, adr);
+			pte = *ptep;
+			if (pte_present(pte)) {
+				ret = (unsigned long)
+					page_address(pte_page(pte));
+				ret |= (adr & (PAGE_SIZE - 1));
+			}
+		}
+	}
+	return ret;
+}
+
+static inline unsigned long kvirt_to_kva(unsigned long adr)
+{
+	unsigned long va, kva;
+
+	va = adr;
+	kva = uvirt_to_kva(pgd_offset_k(va), va);
+
+	return kva;
+}
+
+int comedi_buf_alloc(comedi_device * dev, comedi_subdevice * s,
+	unsigned long new_size)
+{
+	comedi_async *async = s->async;
+
+	/* Round up new_size to multiple of PAGE_SIZE */
+	new_size = (new_size + PAGE_SIZE - 1) & PAGE_MASK;
+
+	/* if no change is required, do nothing */
+	if (async->prealloc_buf && async->prealloc_bufsz == new_size) {
+		return 0;
+	}
+	// deallocate old buffer
+	if (async->prealloc_buf) {
+		vunmap(async->prealloc_buf);
+		async->prealloc_buf = NULL;
+		async->prealloc_bufsz = 0;
+	}
+	if (async->buf_page_list) {
+		unsigned i;
+		for (i = 0; i < async->n_buf_pages; ++i) {
+			if (async->buf_page_list[i].virt_addr) {
+				mem_map_unreserve(virt_to_page(async->
+						buf_page_list[i].virt_addr));
+				if (s->async_dma_dir != DMA_NONE) {
+					dma_free_coherent(dev->hw_dev,
+						PAGE_SIZE,
+						async->buf_page_list[i].
+						virt_addr,
+						async->buf_page_list[i].
+						dma_addr);
+				} else {
+					free_page((unsigned long)async->
+						buf_page_list[i].virt_addr);
+				}
+			}
+		}
+		vfree(async->buf_page_list);
+		async->buf_page_list = NULL;
+		async->n_buf_pages = 0;
+	}
+	// allocate new buffer
+	if (new_size) {
+		unsigned i = 0;
+		unsigned n_pages = new_size >> PAGE_SHIFT;
+		struct page **pages = NULL;
+
+		async->buf_page_list =
+			vmalloc(sizeof(struct comedi_buf_page) * n_pages);
+		if (async->buf_page_list) {
+			memset(async->buf_page_list, 0,
+				sizeof(struct comedi_buf_page) * n_pages);
+			pages = vmalloc(sizeof(struct page *) * n_pages);
+		}
+		if (pages) {
+			for (i = 0; i < n_pages; i++) {
+				if (s->async_dma_dir != DMA_NONE) {
+					async->buf_page_list[i].virt_addr =
+						dma_alloc_coherent(dev->hw_dev,
+						PAGE_SIZE,
+						&async->buf_page_list[i].
+						dma_addr,
+						GFP_KERNEL | __GFP_COMP);
+				} else {
+					async->buf_page_list[i].virt_addr =
+						(void *)
+						get_zeroed_page(GFP_KERNEL);
+				}
+				if (async->buf_page_list[i].virt_addr == NULL) {
+					break;
+				}
+				mem_map_reserve(virt_to_page(async->
+						buf_page_list[i].virt_addr));
+				pages[i] =
+					virt_to_page(async->buf_page_list[i].
+					virt_addr);
+			}
+		}
+		if (i == n_pages) {
+			async->prealloc_buf =
+				vmap(pages, n_pages, VM_MAP,
+				PAGE_KERNEL_NOCACHE);
+		}
+		if (pages) {
+			vfree(pages);
+		}
+		if (async->prealloc_buf == NULL) {
+			/* Some allocation failed above. */
+			if (async->buf_page_list) {
+				for (i = 0; i < n_pages; i++) {
+					if (async->buf_page_list[i].virt_addr ==
+						NULL) {
+						break;
+					}
+					mem_map_unreserve(virt_to_page(async->
+							buf_page_list[i].
+							virt_addr));
+					if (s->async_dma_dir != DMA_NONE) {
+						dma_free_coherent(dev->hw_dev,
+							PAGE_SIZE,
+							async->buf_page_list[i].
+							virt_addr,
+							async->buf_page_list[i].
+							dma_addr);
+					} else {
+						free_page((unsigned long)async->
+							buf_page_list[i].
+							virt_addr);
+					}
+				}
+				vfree(async->buf_page_list);
+				async->buf_page_list = NULL;
+			}
+			return -ENOMEM;
+		}
+		async->n_buf_pages = n_pages;
+	}
+	async->prealloc_bufsz = new_size;
+
+	return 0;
+}
+
+/* munging is applied to data by core as it passes between user
+ * and kernel space */
+unsigned int comedi_buf_munge(comedi_async * async, unsigned int num_bytes)
+{
+	comedi_subdevice *s = async->subdevice;
+	unsigned int count = 0;
+	const unsigned num_sample_bytes = bytes_per_sample(s);
+
+	if (s->munge == NULL || (async->cmd.flags & CMDF_RAWDATA)) {
+		async->munge_count += num_bytes;
+		if ((int)(async->munge_count - async->buf_write_count) > 0)
+			BUG();
+		return num_bytes;
+	}
+	/* don't munge partial samples */
+	num_bytes -= num_bytes % num_sample_bytes;
+	while (count < num_bytes) {
+		int block_size;
+
+		block_size = num_bytes - count;
+		if (block_size < 0) {
+			rt_printk("%s: %s: bug! block_size is negative\n",
+				__FILE__, __FUNCTION__);
+			break;
+		}
+		if ((int)(async->munge_ptr + block_size -
+				async->prealloc_bufsz) > 0)
+			block_size = async->prealloc_bufsz - async->munge_ptr;
+
+		s->munge(s->device, s, async->prealloc_buf + async->munge_ptr,
+			block_size, async->munge_chan);
+
+		smp_wmb();	//barrier insures data is munged in buffer before munge_count is incremented
+
+		async->munge_chan += block_size / num_sample_bytes;
+		async->munge_chan %= async->cmd.chanlist_len;
+		async->munge_count += block_size;
+		async->munge_ptr += block_size;
+		async->munge_ptr %= async->prealloc_bufsz;
+		count += block_size;
+	}
+	if ((int)(async->munge_count - async->buf_write_count) > 0)
+		BUG();
+	return count;
+}
+
+unsigned int comedi_buf_write_n_available(comedi_async * async)
+{
+	unsigned int free_end;
+	unsigned int nbytes;
+
+	if (async == NULL)
+		return 0;
+
+	free_end = async->buf_read_count + async->prealloc_bufsz;
+	nbytes = free_end - async->buf_write_alloc_count;
+	nbytes -= nbytes % bytes_per_sample(async->subdevice);
+	/* barrier insures the read of buf_read_count in this
+	   query occurs before any following writes to the buffer which
+	   might be based on the return value from this query.
+	 */
+	smp_mb();
+	return nbytes;
+}
+
+/* allocates chunk for the writer from free buffer space */
+unsigned int comedi_buf_write_alloc(comedi_async * async, unsigned int nbytes)
+{
+	unsigned int free_end = async->buf_read_count + async->prealloc_bufsz;
+
+	if ((int)(async->buf_write_alloc_count + nbytes - free_end) > 0) {
+		nbytes = free_end - async->buf_write_alloc_count;
+	}
+	async->buf_write_alloc_count += nbytes;
+	/* barrier insures the read of buf_read_count above occurs before
+	   we write data to the write-alloc'ed buffer space */
+	smp_mb();
+	return nbytes;
+}
+
+/* allocates nothing unless it can completely fulfill the request */
+unsigned int comedi_buf_write_alloc_strict(comedi_async * async,
+	unsigned int nbytes)
+{
+	unsigned int free_end = async->buf_read_count + async->prealloc_bufsz;
+
+	if ((int)(async->buf_write_alloc_count + nbytes - free_end) > 0) {
+		nbytes = 0;
+	}
+	async->buf_write_alloc_count += nbytes;
+	/* barrier insures the read of buf_read_count above occurs before
+	   we write data to the write-alloc'ed buffer space */
+	smp_mb();
+	return nbytes;
+}
+
+/* transfers a chunk from writer to filled buffer space */
+unsigned comedi_buf_write_free(comedi_async * async, unsigned int nbytes)
+{
+	if ((int)(async->buf_write_count + nbytes -
+			async->buf_write_alloc_count) > 0) {
+		rt_printk
+			("comedi: attempted to write-free more bytes than have been write-allocated.\n");
+		nbytes = async->buf_write_alloc_count - async->buf_write_count;
+	}
+	async->buf_write_count += nbytes;
+	async->buf_write_ptr += nbytes;
+	comedi_buf_munge(async, async->buf_write_count - async->munge_count);
+	if (async->buf_write_ptr >= async->prealloc_bufsz) {
+		async->buf_write_ptr %= async->prealloc_bufsz;
+	}
+	return nbytes;
+}
+
+/* allocates a chunk for the reader from filled (and munged) buffer space */
+unsigned comedi_buf_read_alloc(comedi_async * async, unsigned nbytes)
+{
+	if ((int)(async->buf_read_alloc_count + nbytes - async->munge_count) >
+		0) {
+		nbytes = async->munge_count - async->buf_read_alloc_count;
+	}
+	async->buf_read_alloc_count += nbytes;
+	/* barrier insures read of munge_count occurs before we actually read
+	   data out of buffer */
+	smp_rmb();
+	return nbytes;
+}
+
+/* transfers control of a chunk from reader to free buffer space */
+unsigned comedi_buf_read_free(comedi_async * async, unsigned int nbytes)
+{
+	// barrier insures data has been read out of buffer before read count is incremented
+	smp_mb();
+	if ((int)(async->buf_read_count + nbytes -
+			async->buf_read_alloc_count) > 0) {
+		rt_printk
+			("comedi: attempted to read-free more bytes than have been read-allocated.\n");
+		nbytes = async->buf_read_alloc_count - async->buf_read_count;
+	}
+	async->buf_read_count += nbytes;
+	async->buf_read_ptr += nbytes;
+	async->buf_read_ptr %= async->prealloc_bufsz;
+	return nbytes;
+}
+
+void comedi_buf_memcpy_to(comedi_async * async, unsigned int offset,
+	const void *data, unsigned int num_bytes)
+{
+	unsigned int write_ptr = async->buf_write_ptr + offset;
+
+	if (write_ptr >= async->prealloc_bufsz)
+		write_ptr %= async->prealloc_bufsz;
+
+	while (num_bytes) {
+		unsigned int block_size;
+
+		if (write_ptr + num_bytes > async->prealloc_bufsz)
+			block_size = async->prealloc_bufsz - write_ptr;
+		else
+			block_size = num_bytes;
+
+		memcpy(async->prealloc_buf + write_ptr, data, block_size);
+
+		data += block_size;
+		num_bytes -= block_size;
+
+		write_ptr = 0;
+	}
+}
+
+void comedi_buf_memcpy_from(comedi_async * async, unsigned int offset,
+	void *dest, unsigned int nbytes)
+{
+	void *src;
+	unsigned int read_ptr = async->buf_read_ptr + offset;
+
+	if (read_ptr >= async->prealloc_bufsz)
+		read_ptr %= async->prealloc_bufsz;
+
+	while (nbytes) {
+		unsigned int block_size;
+
+		src = async->prealloc_buf + read_ptr;
+
+		if (nbytes >= async->prealloc_bufsz - read_ptr)
+			block_size = async->prealloc_bufsz - read_ptr;
+		else
+			block_size = nbytes;
+
+		memcpy(dest, src, block_size);
+		nbytes -= block_size;
+		dest += block_size;
+		read_ptr = 0;
+	}
+}
+
+unsigned int comedi_buf_read_n_available(comedi_async * async)
+{
+	unsigned num_bytes;
+
+	if (async == NULL)
+		return 0;
+	num_bytes = async->munge_count - async->buf_read_count;
+	/* barrier insures the read of munge_count in this
+	   query occurs before any following reads of the buffer which
+	   might be based on the return value from this query.
+	 */
+	smp_rmb();
+	return num_bytes;
+}
+
+int comedi_buf_get(comedi_async * async, sampl_t * x)
+{
+	unsigned int n = comedi_buf_read_n_available(async);
+
+	if (n < sizeof(sampl_t))
+		return 0;
+	comedi_buf_read_alloc(async, sizeof(sampl_t));
+	*x = *(sampl_t *) (async->prealloc_buf + async->buf_read_ptr);
+	comedi_buf_read_free(async, sizeof(sampl_t));
+	return 1;
+}
+
+int comedi_buf_put(comedi_async * async, sampl_t x)
+{
+	unsigned int n = comedi_buf_write_alloc_strict(async, sizeof(sampl_t));
+
+	if (n < sizeof(sampl_t)) {
+		async->events |= COMEDI_CB_ERROR;
+		return 0;
+	}
+	*(sampl_t *) (async->prealloc_buf + async->buf_write_ptr) = x;
+	comedi_buf_write_free(async, sizeof(sampl_t));
+	return 1;
+}
+
+void comedi_reset_async_buf(comedi_async * async)
+{
+	async->buf_write_alloc_count = 0;
+	async->buf_write_count = 0;
+	async->buf_read_alloc_count = 0;
+	async->buf_read_count = 0;
+
+	async->buf_write_ptr = 0;
+	async->buf_read_ptr = 0;
+
+	async->cur_chan = 0;
+	async->scan_progress = 0;
+	async->munge_chan = 0;
+	async->munge_count = 0;
+	async->munge_ptr = 0;
+
+	async->events = 0;
+}
+
+int comedi_auto_config(struct device *hardware_device, const char *board_name, const int *options, unsigned num_options)
+{
+	comedi_devconfig it;
+	int minor;
+	struct comedi_device_file_info *dev_file_info;
+	int retval;
+
+	minor = comedi_alloc_board_minor(hardware_device);
+	if(minor < 0) return minor;
+	dev_set_drvdata(hardware_device, (void*)(unsigned long)minor);
+
+	dev_file_info = comedi_get_device_file_info(minor);
+
+	memset(&it, 0, sizeof(it));
+	strncpy(it.board_name, board_name, COMEDI_NAMELEN);
+	it.board_name[COMEDI_NAMELEN - 1] = '\0';
+	BUG_ON(num_options > COMEDI_NDEVCONFOPTS);
+	memcpy(it.options, options, num_options * sizeof(int));
+
+	mutex_lock(&dev_file_info->device->mutex);
+	retval = comedi_device_attach(dev_file_info->device, &it);
+	mutex_unlock(&dev_file_info->device->mutex);
+	if(retval < 0)
+	{
+		comedi_free_board_minor(minor);
+	}
+	return retval;
+}
+
+void comedi_auto_unconfig(struct device *hardware_device)
+{
+	unsigned long minor = (unsigned long)dev_get_drvdata(hardware_device);
+
+	BUG_ON(minor >= COMEDI_NUM_BOARD_MINORS);
+
+	comedi_free_board_minor(minor);
+}
+
+int comedi_pci_auto_config(struct pci_dev *pcidev, const char *board_name)
+{
+	int options[2];
+
+	// pci bus
+	options[0] = pcidev->bus->number;
+	// pci slot
+	options[1] = PCI_SLOT(pcidev->devfn);
+
+	return comedi_auto_config(&pcidev->dev, board_name, options, sizeof(options) / sizeof(options[0]));
+}
+
+void comedi_pci_auto_unconfig(struct pci_dev *pcidev)
+{
+	comedi_auto_unconfig(&pcidev->dev);
+}
diff --git a/drivers/staging/comedi/proc.c b/drivers/staging/comedi/proc.c
new file mode 100644
index 0000000..7db12ac
--- /dev/null
+++ b/drivers/staging/comedi/proc.c
@@ -0,0 +1,100 @@
+/*
+    module/proc.c
+    /proc interface for comedi
+
+    COMEDI - Linux Control and Measurement Device Interface
+    Copyright (C) 1998 David A. Schleef <ds@schleef.org>
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+*/
+
+/*
+	This is some serious bloatware.
+
+	Taken from Dave A.'s PCL-711 driver, 'cuz I thought it
+	was cool.
+*/
+
+#define __NO_VERSION__
+#include "comedidev.h"
+#include <linux/proc_fs.h>
+//#include <linux/string.h>
+
+int comedi_read_procmem(char *buf, char **start, off_t offset, int len,
+	int *eof, void *data);
+
+extern comedi_driver *comedi_drivers;
+
+int comedi_read_procmem(char *buf, char **start, off_t offset, int len,
+	int *eof, void *data)
+{
+	int i;
+	int devices_q = 0;
+	int l = 0;
+	comedi_driver *driv;
+
+	l += sprintf(buf + l,
+		"comedi version " COMEDI_RELEASE "\n"
+		"format string: %s\n",
+		"\"%2d: %-20s %-20s %4d\",i,driver_name,board_name,n_subdevices");
+
+	for (i = 0; i < COMEDI_NUM_BOARD_MINORS; i++) {
+		struct comedi_device_file_info *dev_file_info = comedi_get_device_file_info(i);
+		comedi_device *dev;
+
+		if(dev_file_info == NULL) continue;
+		dev = dev_file_info->device;
+
+		if (dev->attached) {
+			devices_q = 1;
+			l += sprintf(buf + l, "%2d: %-20s %-20s %4d\n",
+				i,
+				dev->driver->driver_name,
+				dev->board_name, dev->n_subdevices);
+		}
+	}
+	if (!devices_q) {
+		l += sprintf(buf + l, "no devices\n");
+	}
+
+	for (driv = comedi_drivers; driv; driv = driv->next) {
+		l += sprintf(buf + l, "%s:\n", driv->driver_name);
+		for (i = 0; i < driv->num_names; i++) {
+			l += sprintf(buf + l, " %s\n",
+				*(char **)((char *)driv->board_name +
+					i * driv->offset));
+		}
+		if (!driv->num_names) {
+			l += sprintf(buf + l, " %s\n", driv->driver_name);
+		}
+	}
+
+	return l;
+}
+
+void comedi_proc_init(void)
+{
+	struct proc_dir_entry *comedi_proc;
+
+	comedi_proc = create_proc_entry("comedi", S_IFREG | S_IRUGO, 0);
+	if (comedi_proc)
+		comedi_proc->read_proc = comedi_read_procmem;
+}
+
+void comedi_proc_cleanup(void)
+{
+	remove_proc_entry("comedi", 0);
+}
diff --git a/drivers/staging/comedi/range.c b/drivers/staging/comedi/range.c
new file mode 100644
index 0000000..61dc3cd
--- /dev/null
+++ b/drivers/staging/comedi/range.c
@@ -0,0 +1,161 @@
+/*
+    module/range.c
+    comedi routines for voltage ranges
+
+    COMEDI - Linux Control and Measurement Device Interface
+    Copyright (C) 1997-8 David A. Schleef <ds@schleef.org>
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+*/
+
+#include "comedidev.h"
+#include <asm/uaccess.h>
+
+const comedi_lrange range_bipolar10 = { 1, {BIP_RANGE(10)} };
+const comedi_lrange range_bipolar5 = { 1, {BIP_RANGE(5)} };
+const comedi_lrange range_bipolar2_5 = { 1, {BIP_RANGE(2.5)} };
+const comedi_lrange range_unipolar10 = { 1, {UNI_RANGE(10)} };
+const comedi_lrange range_unipolar5 = { 1, {UNI_RANGE(5)} };
+const comedi_lrange range_unknown = { 1, {{0, 1000000, UNIT_none}} };
+
+/*
+   	COMEDI_RANGEINFO
+	range information ioctl
+
+	arg:
+		pointer to rangeinfo structure
+
+	reads:
+		range info structure
+
+	writes:
+		n comedi_krange structures to rangeinfo->range_ptr
+*/
+int do_rangeinfo_ioctl(comedi_device * dev, comedi_rangeinfo * arg)
+{
+	comedi_rangeinfo it;
+	int subd, chan;
+	const comedi_lrange *lr;
+	comedi_subdevice *s;
+
+	if (copy_from_user(&it, arg, sizeof(comedi_rangeinfo)))
+		return -EFAULT;
+	subd = (it.range_type >> 24) & 0xf;
+	chan = (it.range_type >> 16) & 0xff;
+
+	if (!dev->attached)
+		return -EINVAL;
+	if (subd >= dev->n_subdevices)
+		return -EINVAL;
+	s = dev->subdevices + subd;
+	if (s->range_table) {
+		lr = s->range_table;
+	} else if (s->range_table_list) {
+		if (chan >= s->n_chan)
+			return -EINVAL;
+		lr = s->range_table_list[chan];
+	} else {
+		return -EINVAL;
+	}
+
+	if (RANGE_LENGTH(it.range_type) != lr->length) {
+		DPRINTK("wrong length %d should be %d (0x%08x)\n",
+			RANGE_LENGTH(it.range_type), lr->length, it.range_type);
+		return -EINVAL;
+	}
+
+	if (copy_to_user(it.range_ptr, lr->range,
+			sizeof(comedi_krange) * lr->length))
+		return -EFAULT;
+
+	return 0;
+}
+
+static int aref_invalid(comedi_subdevice * s, unsigned int chanspec)
+{
+	unsigned int aref;
+
+	// disable reporting invalid arefs... maybe someday
+	return 0;
+
+	aref = CR_AREF(chanspec);
+	switch (aref) {
+	case AREF_DIFF:
+		if (s->subdev_flags & SDF_DIFF)
+			return 0;
+		break;
+	case AREF_COMMON:
+		if (s->subdev_flags & SDF_COMMON)
+			return 0;
+		break;
+	case AREF_GROUND:
+		if (s->subdev_flags & SDF_GROUND)
+			return 0;
+		break;
+	case AREF_OTHER:
+		if (s->subdev_flags & SDF_OTHER)
+			return 0;
+		break;
+	default:
+		break;
+	}
+	DPRINTK("subdevice does not support aref %i", aref);
+	return 1;
+}
+
+/*
+   This function checks each element in a channel/gain list to make
+   make sure it is valid.
+*/
+int check_chanlist(comedi_subdevice * s, int n, unsigned int *chanlist)
+{
+	int i;
+	int chan;
+
+	if (s->range_table) {
+		for (i = 0; i < n; i++)
+			if (CR_CHAN(chanlist[i]) >= s->n_chan ||
+				CR_RANGE(chanlist[i]) >= s->range_table->length
+				|| aref_invalid(s, chanlist[i])) {
+				rt_printk
+					("bad chanlist[%d]=0x%08x n_chan=%d range length=%d\n",
+					i, chanlist[i], s->n_chan,
+					s->range_table->length);
+#if 0
+				for (i = 0; i < n; i++) {
+					printk("[%d]=0x%08x\n", i, chanlist[i]);
+				}
+#endif
+				return -EINVAL;
+			}
+	} else if (s->range_table_list) {
+		for (i = 0; i < n; i++) {
+			chan = CR_CHAN(chanlist[i]);
+			if (chan >= s->n_chan ||
+				CR_RANGE(chanlist[i]) >=
+				s->range_table_list[chan]->length
+				|| aref_invalid(s, chanlist[i])) {
+				rt_printk("bad chanlist[%d]=0x%08x\n", i,
+					chanlist[i]);
+				return -EINVAL;
+			}
+		}
+	} else {
+		rt_printk("comedi: (bug) no range type list!\n");
+		return -EINVAL;
+	}
+	return 0;
+}
diff --git a/drivers/staging/comedi/rt.c b/drivers/staging/comedi/rt.c
new file mode 100644
index 0000000..385b81b
--- /dev/null
+++ b/drivers/staging/comedi/rt.c
@@ -0,0 +1,412 @@
+/*
+    comedi/rt.c
+    comedi kernel module
+
+    COMEDI - Linux Control and Measurement Device Interface
+    Copyright (C) 1997-2000 David A. Schleef <ds@schleef.org>
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+*/
+
+#undef DEBUG
+
+#define __NO_VERSION__
+#include <linux/comedidev.h>
+
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/fcntl.h>
+#include <linux/delay.h>
+#include <linux/ioport.h>
+#include <linux/mm.h>
+#include <linux/slab.h>
+#include <asm/io.h>
+
+#include "rt_pend_tq.h"
+
+#ifdef CONFIG_COMEDI_RTAI
+#include <rtai.h>
+#endif
+
+#ifdef CONFIG_COMEDI_FUSION
+#include <nucleus/asm/hal.h>
+#endif
+
+#ifdef CONFIG_COMEDI_RTL
+#include <rtl_core.h>
+#include <rtl_sync.h>
+#endif
+
+struct comedi_irq_struct {
+	int rt;
+	int irq;
+	 irqreturn_t(*handler) (int irq, void *dev_id PT_REGS_ARG);
+	unsigned long flags;
+	const char *device;
+	comedi_device *dev_id;
+};
+
+static int comedi_rt_get_irq(struct comedi_irq_struct *it);
+static int comedi_rt_release_irq(struct comedi_irq_struct *it);
+
+static struct comedi_irq_struct *comedi_irqs[NR_IRQS];
+
+int comedi_request_irq(unsigned irq, irqreturn_t(*handler) (int,
+		void *PT_REGS_ARG), unsigned long flags, const char *device,
+	comedi_device * dev_id)
+{
+	struct comedi_irq_struct *it;
+	int ret;
+	/* null shared interrupt flag, since rt interrupt handlers do not
+	 * support it, and this version of comedi_request_irq() is only
+	 * called for kernels with rt support */
+	unsigned long unshared_flags = flags & ~IRQF_SHARED;
+
+	ret = request_irq(irq, handler, unshared_flags, device, dev_id);
+	if (ret < 0) {
+		// we failed, so fall back on allowing shared interrupt (which we won't ever make RT)
+		if (flags & IRQF_SHARED) {
+			rt_printk
+				("comedi: cannot get unshared interrupt, will not use RT interrupts.\n");
+			ret = request_irq(irq, handler, flags, device, dev_id);
+		}
+		if (ret < 0) {
+			return ret;
+		}
+	} else {
+		it = kzalloc(sizeof(struct comedi_irq_struct), GFP_KERNEL);
+		if (!it)
+			return -ENOMEM;
+
+		it->handler = handler;
+		it->irq = irq;
+		it->dev_id = dev_id;
+		it->device = device;
+		it->flags = unshared_flags;
+		comedi_irqs[irq] = it;
+	}
+	return 0;
+}
+
+void comedi_free_irq(unsigned int irq, comedi_device * dev_id)
+{
+	struct comedi_irq_struct *it;
+
+	free_irq(irq, dev_id);
+
+	it = comedi_irqs[irq];
+	if (it == NULL)
+		return;
+
+	if (it->rt) {
+		printk("real-time IRQ allocated at board removal (ignore)\n");
+		comedi_rt_release_irq(it);
+	}
+
+	kfree(it);
+	comedi_irqs[irq] = NULL;
+}
+
+int comedi_switch_to_rt(comedi_device * dev)
+{
+	struct comedi_irq_struct *it;
+	unsigned long flags;
+
+	it = comedi_irqs[dev->irq];
+	/* drivers might not be using an interrupt for commands,
+	   or we might not have been able to get an unshared irq */
+	if (it == NULL)
+		return -1;
+
+	comedi_spin_lock_irqsave(&dev->spinlock, flags);
+
+	if (!dev->rt)
+		comedi_rt_get_irq(it);
+
+	dev->rt++;
+	it->rt = 1;
+
+	comedi_spin_unlock_irqrestore(&dev->spinlock, flags);
+
+	return 0;
+}
+
+void comedi_switch_to_non_rt(comedi_device * dev)
+{
+	struct comedi_irq_struct *it;
+	unsigned long flags;
+
+	it = comedi_irqs[dev->irq];
+	if (it == NULL)
+		return;
+
+	comedi_spin_lock_irqsave(&dev->spinlock, flags);
+
+	dev->rt--;
+	if (!dev->rt)
+		comedi_rt_release_irq(it);
+
+	it->rt = 0;
+
+	comedi_spin_unlock_irqrestore(&dev->spinlock, flags);
+}
+
+void wake_up_int_handler(int arg1, void *arg2)
+{
+	wake_up_interruptible((wait_queue_head_t *) arg2);
+}
+
+void comedi_rt_pend_wakeup(wait_queue_head_t * q)
+{
+	rt_pend_call(wake_up_int_handler, 0, q);
+}
+
+/* RTAI section */
+#ifdef CONFIG_COMEDI_RTAI
+
+#ifndef HAVE_RT_REQUEST_IRQ_WITH_ARG
+#define DECLARE_VOID_IRQ(irq) \
+static void handle_void_irq_ ## irq (void){ handle_void_irq(irq);}
+
+static void handle_void_irq(int irq)
+{
+	struct comedi_irq_struct *it;
+
+	it = comedi_irqs[irq];
+	if (it == NULL) {
+		rt_printk("comedi: null irq struct?\n");
+		return;
+	}
+	it->handler(irq, it->dev_id PT_REGS_NULL);
+	rt_enable_irq(irq);	//needed by rtai-adeos, seems like it shouldn't hurt earlier versions
+}
+
+DECLARE_VOID_IRQ(0);
+DECLARE_VOID_IRQ(1);
+DECLARE_VOID_IRQ(2);
+DECLARE_VOID_IRQ(3);
+DECLARE_VOID_IRQ(4);
+DECLARE_VOID_IRQ(5);
+DECLARE_VOID_IRQ(6);
+DECLARE_VOID_IRQ(7);
+DECLARE_VOID_IRQ(8);
+DECLARE_VOID_IRQ(9);
+DECLARE_VOID_IRQ(10);
+DECLARE_VOID_IRQ(11);
+DECLARE_VOID_IRQ(12);
+DECLARE_VOID_IRQ(13);
+DECLARE_VOID_IRQ(14);
+DECLARE_VOID_IRQ(15);
+DECLARE_VOID_IRQ(16);
+DECLARE_VOID_IRQ(17);
+DECLARE_VOID_IRQ(18);
+DECLARE_VOID_IRQ(19);
+DECLARE_VOID_IRQ(20);
+DECLARE_VOID_IRQ(21);
+DECLARE_VOID_IRQ(22);
+DECLARE_VOID_IRQ(23);
+
+typedef void (*V_FP_V) (void);
+static V_FP_V handle_void_irq_ptrs[] = {
+	handle_void_irq_0,
+	handle_void_irq_1,
+	handle_void_irq_2,
+	handle_void_irq_3,
+	handle_void_irq_4,
+	handle_void_irq_5,
+	handle_void_irq_6,
+	handle_void_irq_7,
+	handle_void_irq_8,
+	handle_void_irq_9,
+	handle_void_irq_10,
+	handle_void_irq_11,
+	handle_void_irq_12,
+	handle_void_irq_13,
+	handle_void_irq_14,
+	handle_void_irq_15,
+	handle_void_irq_16,
+	handle_void_irq_17,
+	handle_void_irq_18,
+	handle_void_irq_19,
+	handle_void_irq_20,
+	handle_void_irq_21,
+	handle_void_irq_22,
+	handle_void_irq_23,
+};
+
+static int comedi_rt_get_irq(struct comedi_irq_struct *it)
+{
+	rt_request_global_irq(it->irq, handle_void_irq_ptrs[it->irq]);
+	rt_startup_irq(it->irq);
+
+	return 0;
+}
+
+static int comedi_rt_release_irq(struct comedi_irq_struct *it)
+{
+	rt_shutdown_irq(it->irq);
+	rt_free_global_irq(it->irq);
+	return 0;
+}
+#else
+
+static int comedi_rt_get_irq(struct comedi_irq_struct *it)
+{
+	int ret;
+
+	ret = rt_request_global_irq_arg(it->irq, it->handler, it->flags,
+		it->device, it->dev_id);
+	if (ret < 0) {
+		rt_printk("rt_request_global_irq_arg() returned %d\n", ret);
+		return ret;
+	}
+	rt_startup_irq(it->irq);
+
+	return 0;
+}
+
+static int comedi_rt_release_irq(struct comedi_irq_struct *it)
+{
+	rt_shutdown_irq(it->irq);
+	rt_free_global_irq(it->irq);
+	return 0;
+}
+#endif
+
+void comedi_rt_init(void)
+{
+	rt_mount_rtai();
+	rt_pend_tq_init();
+}
+
+void comedi_rt_cleanup(void)
+{
+	rt_umount_rtai();
+	rt_pend_tq_cleanup();
+}
+
+#endif
+
+/* Fusion section */
+#ifdef CONFIG_COMEDI_FUSION
+
+static void fusion_handle_irq(unsigned int irq, void *cookie)
+{
+	struct comedi_irq_struct *it = cookie;
+
+	it->handler(irq, it->dev_id PT_REGS_NULL);
+	rthal_irq_enable(irq);
+}
+
+static int comedi_rt_get_irq(struct comedi_irq_struct *it)
+{
+	rthal_irq_request(it->irq, fusion_handle_irq, it);
+	rthal_irq_enable(it->irq);
+	return 0;
+}
+
+static int comedi_rt_release_irq(struct comedi_irq_struct *it)
+{
+	rthal_irq_disable(it->irq);
+	rthal_irq_release(it->irq);
+	return 0;
+}
+
+void comedi_rt_init(void)
+{
+	rt_pend_tq_init();
+}
+
+void comedi_rt_cleanup(void)
+{
+	rt_pend_tq_cleanup();
+}
+
+#endif /*CONFIG_COMEDI_FUSION */
+
+/* RTLinux section */
+#ifdef CONFIG_COMEDI_RTL
+
+static unsigned int handle_rtl_irq(unsigned int irq PT_REGS_ARG)
+{
+	struct comedi_irq_struct *it;
+
+	it = comedi_irqs[irq];
+	if (it == NULL)
+		return 0;
+	it->handler(irq, it->dev_id PT_REGS_NULL);
+	rtl_hard_enable_irq(irq);
+	return 0;
+}
+
+static int comedi_rt_get_irq(struct comedi_irq_struct *it)
+{
+	rtl_request_global_irq(it->irq, handle_rtl_irq);
+	return 0;
+}
+
+static int comedi_rt_release_irq(struct comedi_irq_struct *it)
+{
+	rtl_free_global_irq(it->irq);
+	return 0;
+}
+
+void comedi_rt_init(void)
+{
+	rt_pend_tq_init();
+}
+
+void comedi_rt_cleanup(void)
+{
+	rt_pend_tq_cleanup();
+}
+
+#endif
+
+#ifdef CONFIG_COMEDI_PIRQ
+static int comedi_rt_get_irq(struct comedi_irq_struct *it)
+{
+	int ret;
+
+	free_irq(it->irq, it->dev_id);
+	ret = request_irq(it->irq, it->handler, it->flags | SA_PRIORITY,
+		it->device, it->dev_id);
+
+	return ret;
+}
+
+static int comedi_rt_release_irq(struct comedi_irq_struct *it)
+{
+	int ret;
+
+	free_irq(it->irq, it->dev_id);
+	ret = request_irq(it->irq, it->handler, it->flags,
+		it->device, it->dev_id);
+
+	return ret;
+}
+
+void comedi_rt_init(void)
+{
+	//rt_pend_tq_init();
+}
+
+void comedi_rt_cleanup(void)
+{
+	//rt_pend_tq_cleanup();
+}
+#endif
diff --git a/drivers/staging/comedi/rt_pend_tq.c b/drivers/staging/comedi/rt_pend_tq.c
new file mode 100644
index 0000000..995f076
--- /dev/null
+++ b/drivers/staging/comedi/rt_pend_tq.c
@@ -0,0 +1,113 @@
+#define __NO_VERSION__
+/* rt_pend_tq.c */
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/sched.h>
+#include "comedidev.h"	// for rt spinlocks
+#include "rt_pend_tq.h"
+#ifdef CONFIG_COMEDI_RTAI
+#include <rtai.h>
+#endif
+#ifdef CONFIG_COMEDI_FUSION
+#include <nucleus/asm/hal.h>
+#endif
+#ifdef CONFIG_COMEDI_RTL
+#include <rtl_core.h>
+#endif
+
+#ifdef standalone
+#include <linux/module.h>
+#define rt_pend_tq_init init_module
+#define rt_pend_tq_cleanup cleanup_module
+#endif
+
+volatile static struct rt_pend_tq rt_pend_tq[RT_PEND_TQ_SIZE];
+volatile static struct rt_pend_tq *volatile rt_pend_head = rt_pend_tq,
+	*volatile rt_pend_tail = rt_pend_tq;
+int rt_pend_tq_irq = 0;
+spinlock_t rt_pend_tq_lock = SPIN_LOCK_UNLOCKED;
+
+// WARNING: following code not checked against race conditions yet.
+#define INC_CIRCULAR_PTR(ptr,begin,size) do {if(++(ptr)>=(begin)+(size)) (ptr)=(begin); } while(0)
+#define DEC_CIRCULAR_PTR(ptr,begin,size) do {if(--(ptr)<(begin)) (ptr)=(begin)+(size)-1; } while(0)
+
+int rt_pend_call(void (*func) (int arg1, void *arg2), int arg1, void *arg2)
+{
+	unsigned long flags;
+
+	if (func == NULL)
+		return -EINVAL;
+	if (rt_pend_tq_irq <= 0)
+		return -ENODEV;
+	comedi_spin_lock_irqsave(&rt_pend_tq_lock, flags);
+	INC_CIRCULAR_PTR(rt_pend_head, rt_pend_tq, RT_PEND_TQ_SIZE);
+	if (rt_pend_head == rt_pend_tail) {
+		// overflow, we just refuse to take this request
+		DEC_CIRCULAR_PTR(rt_pend_head, rt_pend_tq, RT_PEND_TQ_SIZE);
+		comedi_spin_unlock_irqrestore(&rt_pend_tq_lock, flags);
+		return -EAGAIN;
+	}
+	rt_pend_head->func = func;
+	rt_pend_head->arg1 = arg1;
+	rt_pend_head->arg2 = arg2;
+	comedi_spin_unlock_irqrestore(&rt_pend_tq_lock, flags);
+#ifdef CONFIG_COMEDI_RTAI
+	rt_pend_linux_srq(rt_pend_tq_irq);
+#endif
+#ifdef CONFIG_COMEDI_FUSION
+	rthal_apc_schedule(rt_pend_tq_irq);
+#endif
+#ifdef CONFIG_COMEDI_RTL
+	rtl_global_pend_irq(rt_pend_tq_irq);
+
+#endif
+	return 0;
+}
+
+#ifdef CONFIG_COMEDI_RTAI
+void rt_pend_irq_handler(void)
+#elif defined(CONFIG_COMEDI_FUSION)
+void rt_pend_irq_handler(void *cookie)
+#elif defined(CONFIG_COMEDI_RTL)
+void rt_pend_irq_handler(int irq, void *dev PT_REGS_ARG)
+#endif
+{
+	while (rt_pend_head != rt_pend_tail) {
+		INC_CIRCULAR_PTR(rt_pend_tail, rt_pend_tq, RT_PEND_TQ_SIZE);
+		rt_pend_tail->func(rt_pend_tail->arg1, rt_pend_tail->arg2);
+	}
+}
+
+int rt_pend_tq_init(void)
+{
+	rt_pend_head = rt_pend_tail = rt_pend_tq;
+#ifdef CONFIG_COMEDI_RTAI
+	rt_pend_tq_irq = rt_request_srq(0, rt_pend_irq_handler, NULL);
+#endif
+#ifdef CONFIG_COMEDI_FUSION
+	rt_pend_tq_irq =
+		rthal_apc_alloc("comedi APC", rt_pend_irq_handler, NULL);
+#endif
+#ifdef CONFIG_COMEDI_RTL
+	rt_pend_tq_irq = rtl_get_soft_irq(rt_pend_irq_handler, "rt_pend_irq");
+#endif
+	if (rt_pend_tq_irq > 0)
+		printk("rt_pend_tq: RT bottom half scheduler initialized OK\n");
+	else
+		printk("rt_pend_tq: rtl_get_soft_irq failed\n");
+	return 0;
+}
+
+void rt_pend_tq_cleanup(void)
+{
+	printk("rt_pend_tq: unloading\n");
+#ifdef CONFIG_COMEDI_RTAI
+	rt_free_srq(rt_pend_tq_irq);
+#endif
+#ifdef CONFIG_COMEDI_FUSION
+	rthal_apc_free(rt_pend_tq_irq);
+#endif
+#ifdef CONFIG_COMEDI_RTL
+	free_irq(rt_pend_tq_irq, NULL);
+#endif
+}
diff --git a/drivers/staging/comedi/rt_pend_tq.h b/drivers/staging/comedi/rt_pend_tq.h
new file mode 100644
index 0000000..01ed71b
--- /dev/null
+++ b/drivers/staging/comedi/rt_pend_tq.h
@@ -0,0 +1,10 @@
+#define RT_PEND_TQ_SIZE 16
+struct rt_pend_tq {
+	void (*func) (int arg1, void *arg2);
+	int arg1;
+	void *arg2;
+};
+extern int rt_pend_call(void (*func) (int arg1, void *arg2), int arg1,
+	void *arg2);
+extern int rt_pend_tq_init(void);
+extern void rt_pend_tq_cleanup(void);
diff --git a/drivers/staging/comedi/wrapper.h b/drivers/staging/comedi/wrapper.h
new file mode 100644
index 0000000..81f8adb7
--- /dev/null
+++ b/drivers/staging/comedi/wrapper.h
@@ -0,0 +1,31 @@
+/*
+    linux/wrapper.h compatibility header
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#ifndef __COMPAT_LINUX_WRAPPER_H_
+#define __COMPAT_LINUX_WRAPPER_H_
+
+#include <linux/version.h>
+
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,5,0)
+#define mem_map_reserve(p)      set_bit(PG_reserved, &((p)->flags))
+#define mem_map_unreserve(p)    clear_bit(PG_reserved, &((p)->flags))
+#else
+#include_next <linux/wrapper.h>
+#endif
+
+#endif /* __COMPAT_LINUX_WRAPPER_H_ */