drivers/comedi/drivers/cb_das16_cs.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0+
 /*
  * cb_das16_cs.c
  * Driver for Computer Boards PC-CARD DAS16/16.
  *
  * COMEDI - Linux Control and Measurement Device Interface
  * Copyright (C) 2000, 2001, 2002 David A. Schleef <ds@schleef.org>
  *
  * PCMCIA support code for this driver is adapted from the dummy_cs.c
  * driver of the Linux PCMCIA Card Services package.
  *
  * The initial developer of the original code is David A. Hinds
  * <dahinds@users.sourceforge.net>.  Portions created by David A. Hinds
  * are Copyright (C) 1999 David A. Hinds.  All Rights Reserved.
  */

 /*
  * Driver: cb_das16_cs
  * Description: Computer Boards PC-CARD DAS16/16
  * Devices: [ComputerBoards] PC-CARD DAS16/16 (cb_das16_cs),
  *   PC-CARD DAS16/16-AO
  * Author: ds
  * Updated: Mon, 04 Nov 2002 20:04:21 -0800
  * Status: experimental
  */

 #include <linux/module.h>
 #include <linux/interrupt.h>
 #include <linux/delay.h>

 #include "../comedi_pcmcia.h"

 #include "comedi_8254.h"

 /*
  * Register I/O map
  */
 #define DAS16CS_AI_DATA_REG		0x00
 #define DAS16CS_AI_MUX_REG		0x02
 #define DAS16CS_AI_MUX_HI_CHAN(x)	(((x) & 0xf) << 4)
 #define DAS16CS_AI_MUX_LO_CHAN(x)	(((x) & 0xf) << 0)
 #define DAS16CS_AI_MUX_SINGLE_CHAN(x)	(DAS16CS_AI_MUX_HI_CHAN(x) |	\
 					 DAS16CS_AI_MUX_LO_CHAN(x))
 #define DAS16CS_MISC1_REG		0x04
 #define DAS16CS_MISC1_INTE		BIT(15)	/* 1=enable; 0=disable */
 #define DAS16CS_MISC1_INT_SRC(x)	(((x) & 0x7) << 12) /* interrupt src */
 #define DAS16CS_MISC1_INT_SRC_NONE	DAS16CS_MISC1_INT_SRC(0)
 #define DAS16CS_MISC1_INT_SRC_PACER	DAS16CS_MISC1_INT_SRC(1)
 #define DAS16CS_MISC1_INT_SRC_EXT	DAS16CS_MISC1_INT_SRC(2)
 #define DAS16CS_MISC1_INT_SRC_FNE	DAS16CS_MISC1_INT_SRC(3)
 #define DAS16CS_MISC1_INT_SRC_FHF	DAS16CS_MISC1_INT_SRC(4)
 #define DAS16CS_MISC1_INT_SRC_EOS	DAS16CS_MISC1_INT_SRC(5)
 #define DAS16CS_MISC1_INT_SRC_MASK	DAS16CS_MISC1_INT_SRC(7)
 #define DAS16CS_MISC1_OVR		BIT(10)	/* ro - 1=FIFO overflow */
 #define DAS16CS_MISC1_AI_CONV(x)	(((x) & 0x3) << 8) /* AI convert src */
 #define DAS16CS_MISC1_AI_CONV_SW	DAS16CS_MISC1_AI_CONV(0)
 #define DAS16CS_MISC1_AI_CONV_EXT_NEG	DAS16CS_MISC1_AI_CONV(1)
 #define DAS16CS_MISC1_AI_CONV_EXT_POS	DAS16CS_MISC1_AI_CONV(2)
 #define DAS16CS_MISC1_AI_CONV_PACER	DAS16CS_MISC1_AI_CONV(3)
 #define DAS16CS_MISC1_AI_CONV_MASK	DAS16CS_MISC1_AI_CONV(3)
 #define DAS16CS_MISC1_EOC		BIT(7)	/* ro - 0=busy; 1=ready */
 #define DAS16CS_MISC1_SEDIFF		BIT(5)	/* 0=diff; 1=se */
 #define DAS16CS_MISC1_INTB		BIT(4)	/* ro - 0=latched; 1=cleared */
 #define DAS16CS_MISC1_MA_MASK		(0xf << 0) /* ro - current ai mux */
 #define DAS16CS_MISC1_DAC1CS		BIT(3)	/* wo - DAC1 chip select */
 #define DAS16CS_MISC1_DACCLK		BIT(2)	/* wo - Serial DAC clock */
 #define DAS16CS_MISC1_DACSD		BIT(1)	/* wo - Serial DAC data */
 #define DAS16CS_MISC1_DAC0CS		BIT(0)	/* wo - DAC0 chip select */
 #define DAS16CS_MISC1_DAC_MASK		(0x0f << 0)
 #define DAS16CS_MISC2_REG		0x06
 #define DAS16CS_MISC2_BME		BIT(14)	/* 1=burst enable; 0=disable */
 #define DAS16CS_MISC2_AI_GAIN(x)	(((x) & 0xf) << 8) /* AI gain */
 #define DAS16CS_MISC2_AI_GAIN_1		DAS16CS_MISC2_AI_GAIN(4) /* +/-10V */
 #define DAS16CS_MISC2_AI_GAIN_2		DAS16CS_MISC2_AI_GAIN(0) /* +/-5V */
 #define DAS16CS_MISC2_AI_GAIN_4		DAS16CS_MISC2_AI_GAIN(1) /* +/-2.5V */
 #define DAS16CS_MISC2_AI_GAIN_8		DAS16CS_MISC2_AI_GAIN(2) /* +-1.25V */
 #define DAS16CS_MISC2_AI_GAIN_MASK	DAS16CS_MISC2_AI_GAIN(0xf)
 #define DAS16CS_MISC2_UDIR		BIT(7)	/* 1=dio7:4 output; 0=input */
 #define DAS16CS_MISC2_LDIR		BIT(6)	/* 1=dio3:0 output; 0=input */
 #define DAS16CS_MISC2_TRGPOL		BIT(5)	/* 1=active lo; 0=hi */
 #define DAS16CS_MISC2_TRGSEL		BIT(4)	/* 1=edge; 0=level */
 #define DAS16CS_MISC2_FFNE		BIT(3)	/* ro - 1=FIFO not empty */
 #define DAS16CS_MISC2_TRGCLR		BIT(3)	/* wo - 1=clr (monstable) */
 #define DAS16CS_MISC2_CLK2		BIT(2)	/* 1=10 MHz; 0=1 MHz */
 #define DAS16CS_MISC2_CTR1		BIT(1)	/* 1=int. 100 kHz; 0=ext. clk */
 #define DAS16CS_MISC2_TRG0		BIT(0)	/* 1=enable; 0=disable */
 #define DAS16CS_TIMER_BASE		0x08
 #define DAS16CS_DIO_REG			0x10

 struct das16cs_board {
 	const char *name;
 	int device_id;
 	unsigned int has_ao:1;
 	unsigned int has_4dio:1;
 };

 static const struct das16cs_board das16cs_boards[] = {
 	{
 		.name		= "PC-CARD DAS16/16-AO",
 		.device_id	= 0x0039,
 		.has_ao		= 1,
 		.has_4dio	= 1,
 	}, {
 		.name		= "PCM-DAS16s/16",
 		.device_id	= 0x4009,
 	}, {
 		.name		= "PC-CARD DAS16/16",
 		.device_id	= 0x0000,	/* unknown */
 	},
 };

 struct das16cs_private {
 	unsigned short misc1;
 	unsigned short misc2;
 };

 static const struct comedi_lrange das16cs_ai_range = {
 	4, {
 		BIP_RANGE(10),
 		BIP_RANGE(5),
 		BIP_RANGE(2.5),
 		BIP_RANGE(1.25),
 	}
 };

 static int das16cs_ai_eoc(struct comedi_device *dev,
 			  struct comedi_subdevice *s,
 			  struct comedi_insn *insn,
 			  unsigned long context)
 {
 	unsigned int status;

 	status = inw(dev->iobase + DAS16CS_MISC1_REG);
 	if (status & DAS16CS_MISC1_EOC)
 		return 0;
 	return -EBUSY;
 }

 static int das16cs_ai_insn_read(struct comedi_device *dev,
 				struct comedi_subdevice *s,
 				struct comedi_insn *insn,
 				unsigned int *data)
 {
 	struct das16cs_private *devpriv = dev->private;
 	int chan = CR_CHAN(insn->chanspec);
 	int range = CR_RANGE(insn->chanspec);
 	int aref = CR_AREF(insn->chanspec);
 	int ret;
 	int i;

 	outw(DAS16CS_AI_MUX_SINGLE_CHAN(chan),
 	     dev->iobase + DAS16CS_AI_MUX_REG);

 	/* disable interrupts, software convert */
 	devpriv->misc1 &= ~(DAS16CS_MISC1_INTE | DAS16CS_MISC1_INT_SRC_MASK |
 			      DAS16CS_MISC1_AI_CONV_MASK);
 	if (aref == AREF_DIFF)
 		devpriv->misc1 &= ~DAS16CS_MISC1_SEDIFF;
 	else
 		devpriv->misc1 |= DAS16CS_MISC1_SEDIFF;
 	outw(devpriv->misc1, dev->iobase + DAS16CS_MISC1_REG);

 	devpriv->misc2 &= ~(DAS16CS_MISC2_BME | DAS16CS_MISC2_AI_GAIN_MASK);
 	switch (range) {
 	case 0:
 		devpriv->misc2 |= DAS16CS_MISC2_AI_GAIN_1;
 		break;
 	case 1:
 		devpriv->misc2 |= DAS16CS_MISC2_AI_GAIN_2;
 		break;
 	case 2:
 		devpriv->misc2 |= DAS16CS_MISC2_AI_GAIN_4;
 		break;
 	case 3:
 		devpriv->misc2 |= DAS16CS_MISC2_AI_GAIN_8;
 		break;
 	}
 	outw(devpriv->misc2, dev->iobase + DAS16CS_MISC2_REG);

 	for (i = 0; i < insn->n; i++) {
 		outw(0, dev->iobase + DAS16CS_AI_DATA_REG);

 		ret = comedi_timeout(dev, s, insn, das16cs_ai_eoc, 0);
 		if (ret)
 			return ret;

 		data[i] = inw(dev->iobase + DAS16CS_AI_DATA_REG);
 	}

 	return i;
 }

 static int das16cs_ao_insn_write(struct comedi_device *dev,
 				 struct comedi_subdevice *s,
 				 struct comedi_insn *insn,
 				 unsigned int *data)
 {
 	struct das16cs_private *devpriv = dev->private;
 	unsigned int chan = CR_CHAN(insn->chanspec);
 	unsigned int val = s->readback[chan];
 	unsigned short misc1;
 	int bit;
 	int i;

 	for (i = 0; i < insn->n; i++) {
 		val = data[i];

 		outw(devpriv->misc1, dev->iobase + DAS16CS_MISC1_REG);
 		udelay(1);

 		/* raise the DACxCS line for the non-selected channel */
 		misc1 = devpriv->misc1 & ~DAS16CS_MISC1_DAC_MASK;
 		if (chan)
 			misc1 |= DAS16CS_MISC1_DAC0CS;
 		else
 			misc1 |= DAS16CS_MISC1_DAC1CS;

 		outw(misc1, dev->iobase + DAS16CS_MISC1_REG);
 		udelay(1);

 		for (bit = 15; bit >= 0; bit--) {
 			if ((val >> bit) & 0x1)
 				misc1 |= DAS16CS_MISC1_DACSD;
 			else
 				misc1 &= ~DAS16CS_MISC1_DACSD;
 			outw(misc1, dev->iobase + DAS16CS_MISC1_REG);
 			udelay(1);
 			outw(misc1 | DAS16CS_MISC1_DACCLK,
 			     dev->iobase + DAS16CS_MISC1_REG);
 			udelay(1);
 		}
 		/*
 		 * Make both DAC0CS and DAC1CS high to load
 		 * the new data and update analog the output
 		 */
 		outw(misc1 | DAS16CS_MISC1_DAC0CS | DAS16CS_MISC1_DAC1CS,
 		     dev->iobase + DAS16CS_MISC1_REG);
 	}
 	s->readback[chan] = val;

 	return insn->n;
 }

 static int das16cs_dio_insn_bits(struct comedi_device *dev,
 				 struct comedi_subdevice *s,
 				 struct comedi_insn *insn,
 				 unsigned int *data)
 {
 	if (comedi_dio_update_state(s, data))
 		outw(s->state, dev->iobase + DAS16CS_DIO_REG);

 	data[1] = inw(dev->iobase + DAS16CS_DIO_REG);

 	return insn->n;
 }

 static int das16cs_dio_insn_config(struct comedi_device *dev,
 				   struct comedi_subdevice *s,
 				   struct comedi_insn *insn,
 				   unsigned int *data)
 {
 	struct das16cs_private *devpriv = dev->private;
 	unsigned int chan = CR_CHAN(insn->chanspec);
 	unsigned int mask;
 	int ret;

 	if (chan < 4)
 		mask = 0x0f;
 	else
 		mask = 0xf0;

 	ret = comedi_dio_insn_config(dev, s, insn, data, mask);
 	if (ret)
 		return ret;

 	if (s->io_bits & 0xf0)
 		devpriv->misc2 |= DAS16CS_MISC2_UDIR;
 	else
 		devpriv->misc2 &= ~DAS16CS_MISC2_UDIR;
 	if (s->io_bits & 0x0f)
 		devpriv->misc2 |= DAS16CS_MISC2_LDIR;
 	else
 		devpriv->misc2 &= ~DAS16CS_MISC2_LDIR;
 	outw(devpriv->misc2, dev->iobase + DAS16CS_MISC2_REG);

 	return insn->n;
 }

 static int das16cs_counter_insn_config(struct comedi_device *dev,
 				       struct comedi_subdevice *s,
 				       struct comedi_insn *insn,
 				       unsigned int *data)
 {
 	struct das16cs_private *devpriv = dev->private;

 	switch (data[0]) {
 	case INSN_CONFIG_SET_CLOCK_SRC:
 		switch (data[1]) {
 		case 0:	/* internal 100 kHz */
 			devpriv->misc2 |= DAS16CS_MISC2_CTR1;
 			break;
 		case 1:	/* external */
 			devpriv->misc2 &= ~DAS16CS_MISC2_CTR1;
 			break;
 		default:
 			return -EINVAL;
 		}
 		outw(devpriv->misc2, dev->iobase + DAS16CS_MISC2_REG);
 		break;
 	case INSN_CONFIG_GET_CLOCK_SRC:
 		if (devpriv->misc2 & DAS16CS_MISC2_CTR1) {
 			data[1] = 0;
 			data[2] = I8254_OSC_BASE_100KHZ;
 		} else {
 			data[1] = 1;
 			data[2] = 0;	/* unknown */
 		}
 		break;
 	default:
 		return -EINVAL;
 	}

 	return insn->n;
 }

 static const void *das16cs_find_boardinfo(struct comedi_device *dev,
 					  struct pcmcia_device *link)
 {
 	const struct das16cs_board *board;
 	int i;

 	for (i = 0; i < ARRAY_SIZE(das16cs_boards); i++) {
 		board = &das16cs_boards[i];
 		if (board->device_id == link->card_id)
 			return board;
 	}

 	return NULL;
 }

 static int das16cs_auto_attach(struct comedi_device *dev,
 			       unsigned long context)
 {
 	struct pcmcia_device *link = comedi_to_pcmcia_dev(dev);
 	const struct das16cs_board *board;
 	struct das16cs_private *devpriv;
 	struct comedi_subdevice *s;
 	int ret;

 	board = das16cs_find_boardinfo(dev, link);
 	if (!board)
 		return -ENODEV;
 	dev->board_ptr = board;
 	dev->board_name = board->name;

 	link->config_flags |= CONF_AUTO_SET_IO | CONF_ENABLE_IRQ;
 	ret = comedi_pcmcia_enable(dev, NULL);
 	if (ret)
 		return ret;
 	dev->iobase = link->resource[0]->start;

 	link->priv = dev;

 	devpriv = comedi_alloc_devpriv(dev, sizeof(*devpriv));
 	if (!devpriv)
 		return -ENOMEM;

 	dev->pacer = comedi_8254_init(dev->iobase + DAS16CS_TIMER_BASE,
 				      I8254_OSC_BASE_10MHZ, I8254_IO16, 0);
 	if (!dev->pacer)
 		return -ENOMEM;

 	ret = comedi_alloc_subdevices(dev, 4);
 	if (ret)
 		return ret;

 	/* Analog Input subdevice */
 	s = &dev->subdevices[0];
 	s->type		= COMEDI_SUBD_AI;
 	s->subdev_flags	= SDF_READABLE | SDF_GROUND | SDF_DIFF;
 	s->n_chan	= 16;
 	s->maxdata	= 0xffff;
 	s->range_table	= &das16cs_ai_range;
 	s->insn_read	= das16cs_ai_insn_read;

 	/* Analog Output subdevice */
 	s = &dev->subdevices[1];
 	if (board->has_ao) {
 		s->type		= COMEDI_SUBD_AO;
 		s->subdev_flags	= SDF_WRITABLE;
 		s->n_chan	= 2;
 		s->maxdata	= 0xffff;
 		s->range_table	= &range_bipolar10;
 		s->insn_write	= &das16cs_ao_insn_write;

 		ret = comedi_alloc_subdev_readback(s);
 		if (ret)
 			return ret;
 	} else {
 		s->type		= COMEDI_SUBD_UNUSED;
 	}

 	/* Digital I/O subdevice */
 	s = &dev->subdevices[2];
 	s->type		= COMEDI_SUBD_DIO;
 	s->subdev_flags	= SDF_READABLE | SDF_WRITABLE;
 	s->n_chan	= board->has_4dio ? 4 : 8;
 	s->maxdata	= 1;
 	s->range_table	= &range_digital;
 	s->insn_bits	= das16cs_dio_insn_bits;
 	s->insn_config	= das16cs_dio_insn_config;

 	/* Counter subdevice (8254) */
 	s = &dev->subdevices[3];
 	comedi_8254_subdevice_init(s, dev->pacer);

 	dev->pacer->insn_config = das16cs_counter_insn_config;

 	/* counters 1 and 2 are used internally for the pacer */
 	comedi_8254_set_busy(dev->pacer, 1, true);
 	comedi_8254_set_busy(dev->pacer, 2, true);

 	return 0;
 }

 static struct comedi_driver driver_das16cs = {
 	.driver_name	= "cb_das16_cs",
 	.module		= THIS_MODULE,
 	.auto_attach	= das16cs_auto_attach,
 	.detach		= comedi_pcmcia_disable,
 };

 static int das16cs_pcmcia_attach(struct pcmcia_device *link)
 {
 	return comedi_pcmcia_auto_config(link, &driver_das16cs);
 }

 static const struct pcmcia_device_id das16cs_id_table[] = {
 	PCMCIA_DEVICE_MANF_CARD(0x01c5, 0x0039),
 	PCMCIA_DEVICE_MANF_CARD(0x01c5, 0x4009),
 	PCMCIA_DEVICE_NULL
 };
 MODULE_DEVICE_TABLE(pcmcia, das16cs_id_table);

 static struct pcmcia_driver das16cs_driver = {
 	.name		= "cb_das16_cs",
 	.owner		= THIS_MODULE,
 	.id_table	= das16cs_id_table,
 	.probe		= das16cs_pcmcia_attach,
 	.remove		= comedi_pcmcia_auto_unconfig,
 };
 module_comedi_pcmcia_driver(driver_das16cs, das16cs_driver);

 MODULE_AUTHOR("David A. Schleef <ds@schleef.org>");
 MODULE_DESCRIPTION("Comedi driver for Computer Boards PC-CARD DAS16/16");
 MODULE_LICENSE("GPL");
	// SPDX-License-Identifier: GPL-2.0+
	/*
	* cb_das16_cs.c
	* Driver for Computer Boards PC-CARD DAS16/16.
	*
	* COMEDI - Linux Control and Measurement Device Interface
	* Copyright (C) 2000, 2001, 2002 David A. Schleef <ds@schleef.org>
	*
	* PCMCIA support code for this driver is adapted from the dummy_cs.c
	* driver of the Linux PCMCIA Card Services package.
	*
	* The initial developer of the original code is David A. Hinds
	* <dahinds@users.sourceforge.net>. Portions created by David A. Hinds
	* are Copyright (C) 1999 David A. Hinds. All Rights Reserved.
	*/

	/*
	* Driver: cb_das16_cs
	* Description: Computer Boards PC-CARD DAS16/16
	* Devices: [ComputerBoards] PC-CARD DAS16/16 (cb_das16_cs),
	* PC-CARD DAS16/16-AO
	* Author: ds
	* Updated: Mon, 04 Nov 2002 20:04:21 -0800
	* Status: experimental
	*/

	#include <linux/module.h>
	#include <linux/interrupt.h>
	#include <linux/delay.h>

	#include "../comedi_pcmcia.h"

	#include "comedi_8254.h"

	/*
	* Register I/O map
	*/
	#define DAS16CS_AI_DATA_REG 0x00
	#define DAS16CS_AI_MUX_REG 0x02
	#define DAS16CS_AI_MUX_HI_CHAN(x) (((x) & 0xf) << 4)
	#define DAS16CS_AI_MUX_LO_CHAN(x) (((x) & 0xf) << 0)
	#define DAS16CS_AI_MUX_SINGLE_CHAN(x) (DAS16CS_AI_MUX_HI_CHAN(x) \| \
	DAS16CS_AI_MUX_LO_CHAN(x))
	#define DAS16CS_MISC1_REG 0x04
	#define DAS16CS_MISC1_INTE BIT(15) /* 1=enable; 0=disable */
	#define DAS16CS_MISC1_INT_SRC(x) (((x) & 0x7) << 12) /* interrupt src */
	#define DAS16CS_MISC1_INT_SRC_NONE DAS16CS_MISC1_INT_SRC(0)
	#define DAS16CS_MISC1_INT_SRC_PACER DAS16CS_MISC1_INT_SRC(1)
	#define DAS16CS_MISC1_INT_SRC_EXT DAS16CS_MISC1_INT_SRC(2)
	#define DAS16CS_MISC1_INT_SRC_FNE DAS16CS_MISC1_INT_SRC(3)
	#define DAS16CS_MISC1_INT_SRC_FHF DAS16CS_MISC1_INT_SRC(4)
	#define DAS16CS_MISC1_INT_SRC_EOS DAS16CS_MISC1_INT_SRC(5)
	#define DAS16CS_MISC1_INT_SRC_MASK DAS16CS_MISC1_INT_SRC(7)
	#define DAS16CS_MISC1_OVR BIT(10) /* ro - 1=FIFO overflow */
	#define DAS16CS_MISC1_AI_CONV(x) (((x) & 0x3) << 8) /* AI convert src */
	#define DAS16CS_MISC1_AI_CONV_SW DAS16CS_MISC1_AI_CONV(0)
	#define DAS16CS_MISC1_AI_CONV_EXT_NEG DAS16CS_MISC1_AI_CONV(1)
	#define DAS16CS_MISC1_AI_CONV_EXT_POS DAS16CS_MISC1_AI_CONV(2)
	#define DAS16CS_MISC1_AI_CONV_PACER DAS16CS_MISC1_AI_CONV(3)
	#define DAS16CS_MISC1_AI_CONV_MASK DAS16CS_MISC1_AI_CONV(3)
	#define DAS16CS_MISC1_EOC BIT(7) /* ro - 0=busy; 1=ready */
	#define DAS16CS_MISC1_SEDIFF BIT(5) /* 0=diff; 1=se */
	#define DAS16CS_MISC1_INTB BIT(4) /* ro - 0=latched; 1=cleared */
	#define DAS16CS_MISC1_MA_MASK (0xf << 0) /* ro - current ai mux */
	#define DAS16CS_MISC1_DAC1CS BIT(3) /* wo - DAC1 chip select */
	#define DAS16CS_MISC1_DACCLK BIT(2) /* wo - Serial DAC clock */
	#define DAS16CS_MISC1_DACSD BIT(1) /* wo - Serial DAC data */
	#define DAS16CS_MISC1_DAC0CS BIT(0) /* wo - DAC0 chip select */
	#define DAS16CS_MISC1_DAC_MASK (0x0f << 0)
	#define DAS16CS_MISC2_REG 0x06
	#define DAS16CS_MISC2_BME BIT(14) /* 1=burst enable; 0=disable */
	#define DAS16CS_MISC2_AI_GAIN(x) (((x) & 0xf) << 8) /* AI gain */
	#define DAS16CS_MISC2_AI_GAIN_1 DAS16CS_MISC2_AI_GAIN(4) /* +/-10V */
	#define DAS16CS_MISC2_AI_GAIN_2 DAS16CS_MISC2_AI_GAIN(0) /* +/-5V */
	#define DAS16CS_MISC2_AI_GAIN_4 DAS16CS_MISC2_AI_GAIN(1) /* +/-2.5V */
	#define DAS16CS_MISC2_AI_GAIN_8 DAS16CS_MISC2_AI_GAIN(2) /* +-1.25V */
	#define DAS16CS_MISC2_AI_GAIN_MASK DAS16CS_MISC2_AI_GAIN(0xf)
	#define DAS16CS_MISC2_UDIR BIT(7) /* 1=dio7:4 output; 0=input */
	#define DAS16CS_MISC2_LDIR BIT(6) /* 1=dio3:0 output; 0=input */
	#define DAS16CS_MISC2_TRGPOL BIT(5) /* 1=active lo; 0=hi */
	#define DAS16CS_MISC2_TRGSEL BIT(4) /* 1=edge; 0=level */
	#define DAS16CS_MISC2_FFNE BIT(3) /* ro - 1=FIFO not empty */
	#define DAS16CS_MISC2_TRGCLR BIT(3) /* wo - 1=clr (monstable) */
	#define DAS16CS_MISC2_CLK2 BIT(2) /* 1=10 MHz; 0=1 MHz */
	#define DAS16CS_MISC2_CTR1 BIT(1) /* 1=int. 100 kHz; 0=ext. clk */
	#define DAS16CS_MISC2_TRG0 BIT(0) /* 1=enable; 0=disable */
	#define DAS16CS_TIMER_BASE 0x08
	#define DAS16CS_DIO_REG 0x10

	struct das16cs_board {
	const char *name;
	int device_id;
	unsigned int has_ao:1;
	unsigned int has_4dio:1;
	};

	static const struct das16cs_board das16cs_boards[] = {
	{
	.name = "PC-CARD DAS16/16-AO",
	.device_id = 0x0039,
	.has_ao = 1,
	.has_4dio = 1,
	}, {
	.name = "PCM-DAS16s/16",
	.device_id = 0x4009,
	}, {
	.name = "PC-CARD DAS16/16",
	.device_id = 0x0000, /* unknown */
	},
	};

	struct das16cs_private {
	unsigned short misc1;
	unsigned short misc2;
	};

	static const struct comedi_lrange das16cs_ai_range = {
	4, {
	BIP_RANGE(10),
	BIP_RANGE(5),
	BIP_RANGE(2.5),
	BIP_RANGE(1.25),
	}
	};

	static int das16cs_ai_eoc(struct comedi_device *dev,
	struct comedi_subdevice *s,
	struct comedi_insn *insn,
	unsigned long context)
	{
	unsigned int status;

	status = inw(dev->iobase + DAS16CS_MISC1_REG);
	if (status & DAS16CS_MISC1_EOC)
	return 0;
	return -EBUSY;
	}

	static int das16cs_ai_insn_read(struct comedi_device *dev,
	struct comedi_subdevice *s,
	struct comedi_insn *insn,
	unsigned int *data)
	{
	struct das16cs_private *devpriv = dev->private;
	int chan = CR_CHAN(insn->chanspec);
	int range = CR_RANGE(insn->chanspec);
	int aref = CR_AREF(insn->chanspec);
	int ret;
	int i;

	outw(DAS16CS_AI_MUX_SINGLE_CHAN(chan),
	dev->iobase + DAS16CS_AI_MUX_REG);

	/* disable interrupts, software convert */
	devpriv->misc1 &= ~(DAS16CS_MISC1_INTE \| DAS16CS_MISC1_INT_SRC_MASK \|
	DAS16CS_MISC1_AI_CONV_MASK);
	if (aref == AREF_DIFF)
	devpriv->misc1 &= ~DAS16CS_MISC1_SEDIFF;
	else
	devpriv->misc1 \|= DAS16CS_MISC1_SEDIFF;
	outw(devpriv->misc1, dev->iobase + DAS16CS_MISC1_REG);

	devpriv->misc2 &= ~(DAS16CS_MISC2_BME \| DAS16CS_MISC2_AI_GAIN_MASK);
	switch (range) {
	case 0:
	devpriv->misc2 \|= DAS16CS_MISC2_AI_GAIN_1;
	break;
	case 1:
	devpriv->misc2 \|= DAS16CS_MISC2_AI_GAIN_2;
	break;
	case 2:
	devpriv->misc2 \|= DAS16CS_MISC2_AI_GAIN_4;
	break;
	case 3:
	devpriv->misc2 \|= DAS16CS_MISC2_AI_GAIN_8;
	break;
	}
	outw(devpriv->misc2, dev->iobase + DAS16CS_MISC2_REG);

	for (i = 0; i < insn->n; i++) {
	outw(0, dev->iobase + DAS16CS_AI_DATA_REG);

	ret = comedi_timeout(dev, s, insn, das16cs_ai_eoc, 0);
	if (ret)
	return ret;

	data[i] = inw(dev->iobase + DAS16CS_AI_DATA_REG);
	}

	return i;
	}

	static int das16cs_ao_insn_write(struct comedi_device *dev,
	struct comedi_subdevice *s,
	struct comedi_insn *insn,
	unsigned int *data)
	{
	struct das16cs_private *devpriv = dev->private;
	unsigned int chan = CR_CHAN(insn->chanspec);
	unsigned int val = s->readback[chan];
	unsigned short misc1;
	int bit;
	int i;

	for (i = 0; i < insn->n; i++) {
	val = data[i];

	outw(devpriv->misc1, dev->iobase + DAS16CS_MISC1_REG);
	udelay(1);

	/* raise the DACxCS line for the non-selected channel */
	misc1 = devpriv->misc1 & ~DAS16CS_MISC1_DAC_MASK;
	if (chan)
	misc1 \|= DAS16CS_MISC1_DAC0CS;
	else
	misc1 \|= DAS16CS_MISC1_DAC1CS;

	outw(misc1, dev->iobase + DAS16CS_MISC1_REG);
	udelay(1);

	for (bit = 15; bit >= 0; bit--) {
	if ((val >> bit) & 0x1)
	misc1 \|= DAS16CS_MISC1_DACSD;
	else
	misc1 &= ~DAS16CS_MISC1_DACSD;
	outw(misc1, dev->iobase + DAS16CS_MISC1_REG);
	udelay(1);
	outw(misc1 \| DAS16CS_MISC1_DACCLK,
	dev->iobase + DAS16CS_MISC1_REG);
	udelay(1);
	}
	/*
	* Make both DAC0CS and DAC1CS high to load
	* the new data and update analog the output
	*/
	outw(misc1 \| DAS16CS_MISC1_DAC0CS \| DAS16CS_MISC1_DAC1CS,
	dev->iobase + DAS16CS_MISC1_REG);
	}
	s->readback[chan] = val;

	return insn->n;
	}

	static int das16cs_dio_insn_bits(struct comedi_device *dev,
	struct comedi_subdevice *s,
	struct comedi_insn *insn,
	unsigned int *data)
	{
	if (comedi_dio_update_state(s, data))
	outw(s->state, dev->iobase + DAS16CS_DIO_REG);

	data[1] = inw(dev->iobase + DAS16CS_DIO_REG);

	return insn->n;
	}

	static int das16cs_dio_insn_config(struct comedi_device *dev,
	struct comedi_subdevice *s,
	struct comedi_insn *insn,
	unsigned int *data)
	{
	struct das16cs_private *devpriv = dev->private;
	unsigned int chan = CR_CHAN(insn->chanspec);
	unsigned int mask;
	int ret;

	if (chan < 4)
	mask = 0x0f;
	else
	mask = 0xf0;

	ret = comedi_dio_insn_config(dev, s, insn, data, mask);
	if (ret)
	return ret;

	if (s->io_bits & 0xf0)
	devpriv->misc2 \|= DAS16CS_MISC2_UDIR;
	else
	devpriv->misc2 &= ~DAS16CS_MISC2_UDIR;
	if (s->io_bits & 0x0f)
	devpriv->misc2 \|= DAS16CS_MISC2_LDIR;
	else
	devpriv->misc2 &= ~DAS16CS_MISC2_LDIR;
	outw(devpriv->misc2, dev->iobase + DAS16CS_MISC2_REG);

	return insn->n;
	}

	static int das16cs_counter_insn_config(struct comedi_device *dev,
	struct comedi_subdevice *s,
	struct comedi_insn *insn,
	unsigned int *data)
	{
	struct das16cs_private *devpriv = dev->private;

	switch (data[0]) {
	case INSN_CONFIG_SET_CLOCK_SRC:
	switch (data[1]) {
	case 0: /* internal 100 kHz */
	devpriv->misc2 \|= DAS16CS_MISC2_CTR1;
	break;
	case 1: /* external */
	devpriv->misc2 &= ~DAS16CS_MISC2_CTR1;
	break;
	default:
	return -EINVAL;
	}
	outw(devpriv->misc2, dev->iobase + DAS16CS_MISC2_REG);
	break;
	case INSN_CONFIG_GET_CLOCK_SRC:
	if (devpriv->misc2 & DAS16CS_MISC2_CTR1) {
	data[1] = 0;
	data[2] = I8254_OSC_BASE_100KHZ;
	} else {
	data[1] = 1;
	data[2] = 0; /* unknown */
	}
	break;
	default:
	return -EINVAL;
	}

	return insn->n;
	}

	static const void das16cs_find_boardinfo(struct comedi_device dev,
	struct pcmcia_device *link)
	{
	const struct das16cs_board *board;
	int i;

	for (i = 0; i < ARRAY_SIZE(das16cs_boards); i++) {
	board = &das16cs_boards[i];
	if (board->device_id == link->card_id)
	return board;
	}

	return NULL;
	}

	static int das16cs_auto_attach(struct comedi_device *dev,
	unsigned long context)
	{
	struct pcmcia_device *link = comedi_to_pcmcia_dev(dev);
	const struct das16cs_board *board;
	struct das16cs_private *devpriv;
	struct comedi_subdevice *s;
	int ret;

	board = das16cs_find_boardinfo(dev, link);
	if (!board)
	return -ENODEV;
	dev->board_ptr = board;
	dev->board_name = board->name;

	link->config_flags \|= CONF_AUTO_SET_IO \| CONF_ENABLE_IRQ;
	ret = comedi_pcmcia_enable(dev, NULL);
	if (ret)
	return ret;
	dev->iobase = link->resource[0]->start;

	link->priv = dev;

	devpriv = comedi_alloc_devpriv(dev, sizeof(*devpriv));
	if (!devpriv)
	return -ENOMEM;

	dev->pacer = comedi_8254_init(dev->iobase + DAS16CS_TIMER_BASE,
	I8254_OSC_BASE_10MHZ, I8254_IO16, 0);
	if (!dev->pacer)
	return -ENOMEM;

	ret = comedi_alloc_subdevices(dev, 4);
	if (ret)
	return ret;

	/* Analog Input subdevice */
	s = &dev->subdevices[0];
	s->type = COMEDI_SUBD_AI;
	s->subdev_flags = SDF_READABLE \| SDF_GROUND \| SDF_DIFF;
	s->n_chan = 16;
	s->maxdata = 0xffff;
	s->range_table = &das16cs_ai_range;
	s->insn_read = das16cs_ai_insn_read;

	/* Analog Output subdevice */
	s = &dev->subdevices[1];
	if (board->has_ao) {
	s->type = COMEDI_SUBD_AO;
	s->subdev_flags = SDF_WRITABLE;
	s->n_chan = 2;
	s->maxdata = 0xffff;
	s->range_table = &range_bipolar10;
	s->insn_write = &das16cs_ao_insn_write;

	ret = comedi_alloc_subdev_readback(s);
	if (ret)
	return ret;
	} else {
	s->type = COMEDI_SUBD_UNUSED;
	}

	/* Digital I/O subdevice */
	s = &dev->subdevices[2];
	s->type = COMEDI_SUBD_DIO;
	s->subdev_flags = SDF_READABLE \| SDF_WRITABLE;
	s->n_chan = board->has_4dio ? 4 : 8;
	s->maxdata = 1;
	s->range_table = &range_digital;
	s->insn_bits = das16cs_dio_insn_bits;
	s->insn_config = das16cs_dio_insn_config;

	/* Counter subdevice (8254) */
	s = &dev->subdevices[3];
	comedi_8254_subdevice_init(s, dev->pacer);

	dev->pacer->insn_config = das16cs_counter_insn_config;

	/* counters 1 and 2 are used internally for the pacer */
	comedi_8254_set_busy(dev->pacer, 1, true);
	comedi_8254_set_busy(dev->pacer, 2, true);

	return 0;
	}

	static struct comedi_driver driver_das16cs = {
	.driver_name = "cb_das16_cs",
	.module = THIS_MODULE,
	.auto_attach = das16cs_auto_attach,
	.detach = comedi_pcmcia_disable,
	};

	static int das16cs_pcmcia_attach(struct pcmcia_device *link)
	{
	return comedi_pcmcia_auto_config(link, &driver_das16cs);
	}

	static const struct pcmcia_device_id das16cs_id_table[] = {
	PCMCIA_DEVICE_MANF_CARD(0x01c5, 0x0039),
	PCMCIA_DEVICE_MANF_CARD(0x01c5, 0x4009),
	PCMCIA_DEVICE_NULL
	};
	MODULE_DEVICE_TABLE(pcmcia, das16cs_id_table);

	static struct pcmcia_driver das16cs_driver = {
	.name = "cb_das16_cs",
	.owner = THIS_MODULE,
	.id_table = das16cs_id_table,
	.probe = das16cs_pcmcia_attach,
	.remove = comedi_pcmcia_auto_unconfig,
	};
	module_comedi_pcmcia_driver(driver_das16cs, das16cs_driver);

	MODULE_AUTHOR("David A. Schleef <ds@schleef.org>");
	MODULE_DESCRIPTION("Comedi driver for Computer Boards PC-CARD DAS16/16");
	MODULE_LICENSE("GPL");