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

 // SPDX-License-Identifier: GPL-2.0+
 /*
  * comedi/drivers/cb_pcimdas.c
  * Comedi driver for Computer Boards PCIM-DAS1602/16 and PCIe-DAS1602/16
  *
  * COMEDI - Linux Control and Measurement Device Interface
  * Copyright (C) 2000 David A. Schleef <ds@schleef.org>
  */

 /*
  * Driver: cb_pcimdas
  * Description: Measurement Computing PCI Migration series boards
  * Devices: [ComputerBoards] PCIM-DAS1602/16 (cb_pcimdas), PCIe-DAS1602/16
  * Author: Richard Bytheway
  * Updated: Mon, 13 Oct 2014 11:57:39 +0000
  * Status: experimental
  *
  * Written to support the PCIM-DAS1602/16 and PCIe-DAS1602/16.
  *
  * Configuration Options:
  *   none
  *
  * Manual configuration of PCI(e) cards is not supported; they are configured
  * automatically.
  *
  * Developed from cb_pcidas and skel by Richard Bytheway (mocelet@sucs.org).
  * Only supports DIO, AO and simple AI in it's present form.
  * No interrupts, multi channel or FIFO AI,
  * although the card looks like it could support this.
  *
  * https://www.mccdaq.com/PDFs/Manuals/pcim-das1602-16.pdf
  * https://www.mccdaq.com/PDFs/Manuals/pcie-das1602-16.pdf
  */

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

 #include "../comedi_pci.h"

 #include "comedi_8254.h"
 #include "plx9052.h"
 #include "8255.h"

 /*
  * PCI Bar 1 Register map
  * see plx9052.h for register and bit defines
  */

 /*
  * PCI Bar 2 Register map (devpriv->daqio)
  */
 #define PCIMDAS_AI_REG			0x00
 #define PCIMDAS_AI_SOFTTRIG_REG		0x00
 #define PCIMDAS_AO_REG(x)		(0x02 + ((x) * 2))

 /*
  * PCI Bar 3 Register map (devpriv->BADR3)
  */
 #define PCIMDAS_MUX_REG			0x00
 #define PCIMDAS_MUX(_lo, _hi)		((_lo) | ((_hi) << 4))
 #define PCIMDAS_DI_DO_REG		0x01
 #define PCIMDAS_STATUS_REG		0x02
 #define PCIMDAS_STATUS_EOC		BIT(7)
 #define PCIMDAS_STATUS_UB		BIT(6)
 #define PCIMDAS_STATUS_MUX		BIT(5)
 #define PCIMDAS_STATUS_CLK		BIT(4)
 #define PCIMDAS_STATUS_TO_CURR_MUX(x)	((x) & 0xf)
 #define PCIMDAS_CONV_STATUS_REG		0x03
 #define PCIMDAS_CONV_STATUS_EOC		BIT(7)
 #define PCIMDAS_CONV_STATUS_EOB		BIT(6)
 #define PCIMDAS_CONV_STATUS_EOA		BIT(5)
 #define PCIMDAS_CONV_STATUS_FNE		BIT(4)
 #define PCIMDAS_CONV_STATUS_FHF		BIT(3)
 #define PCIMDAS_CONV_STATUS_OVERRUN	BIT(2)
 #define PCIMDAS_IRQ_REG			0x04
 #define PCIMDAS_IRQ_INTE		BIT(7)
 #define PCIMDAS_IRQ_INT			BIT(6)
 #define PCIMDAS_IRQ_OVERRUN		BIT(4)
 #define PCIMDAS_IRQ_EOA			BIT(3)
 #define PCIMDAS_IRQ_EOA_INT_SEL		BIT(2)
 #define PCIMDAS_IRQ_INTSEL(x)		((x) << 0)
 #define PCIMDAS_IRQ_INTSEL_EOC		PCIMDAS_IRQ_INTSEL(0)
 #define PCIMDAS_IRQ_INTSEL_FNE		PCIMDAS_IRQ_INTSEL(1)
 #define PCIMDAS_IRQ_INTSEL_EOB		PCIMDAS_IRQ_INTSEL(2)
 #define PCIMDAS_IRQ_INTSEL_FHF_EOA	PCIMDAS_IRQ_INTSEL(3)
 #define PCIMDAS_PACER_REG		0x05
 #define PCIMDAS_PACER_GATE_STATUS	BIT(6)
 #define PCIMDAS_PACER_GATE_POL		BIT(5)
 #define PCIMDAS_PACER_GATE_LATCH	BIT(4)
 #define PCIMDAS_PACER_GATE_EN		BIT(3)
 #define PCIMDAS_PACER_EXT_PACER_POL	BIT(2)
 #define PCIMDAS_PACER_SRC(x)		((x) << 0)
 #define PCIMDAS_PACER_SRC_POLLED	PCIMDAS_PACER_SRC(0)
 #define PCIMDAS_PACER_SRC_EXT		PCIMDAS_PACER_SRC(2)
 #define PCIMDAS_PACER_SRC_INT		PCIMDAS_PACER_SRC(3)
 #define PCIMDAS_PACER_SRC_MASK		(3 << 0)
 #define PCIMDAS_BURST_REG		0x06
 #define PCIMDAS_BURST_BME		BIT(1)
 #define PCIMDAS_BURST_CONV_EN		BIT(0)
 #define PCIMDAS_GAIN_REG		0x07
 #define PCIMDAS_8254_BASE		0x08
 #define PCIMDAS_USER_CNTR_REG		0x0c
 #define PCIMDAS_USER_CNTR_CTR1_CLK_SEL	BIT(0)
 #define PCIMDAS_RESIDUE_MSB_REG		0x0d
 #define PCIMDAS_RESIDUE_LSB_REG		0x0e

 /*
  * PCI Bar 4 Register map (dev->iobase)
  */
 #define PCIMDAS_8255_BASE		0x00

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

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

 /*
  * The Analog Output range is not programmable. The DAC ranges are
  * jumper-settable on the board. The settings are not software-readable.
  */
 static const struct comedi_lrange cb_pcimdas_ao_range = {
 	6, {
 		BIP_RANGE(10),
 		BIP_RANGE(5),
 		UNI_RANGE(10),
 		UNI_RANGE(5),
 		RANGE_ext(-1, 1),
 		RANGE_ext(0, 1)
 	}
 };

 /*
  * this structure is for data unique to this hardware driver.  If
  * several hardware drivers keep similar information in this structure,
  * feel free to suggest moving the variable to the struct comedi_device
  * struct.
  */
 struct cb_pcimdas_private {
 	/* base addresses */
 	unsigned long daqio;
 	unsigned long BADR3;
 };

 static int cb_pcimdas_ai_eoc(struct comedi_device *dev,
 			     struct comedi_subdevice *s,
 			     struct comedi_insn *insn,
 			     unsigned long context)
 {
 	struct cb_pcimdas_private *devpriv = dev->private;
 	unsigned int status;

 	status = inb(devpriv->BADR3 + PCIMDAS_STATUS_REG);
 	if ((status & PCIMDAS_STATUS_EOC) == 0)
 		return 0;
 	return -EBUSY;
 }

 static int cb_pcimdas_ai_insn_read(struct comedi_device *dev,
 				   struct comedi_subdevice *s,
 				   struct comedi_insn *insn,
 				   unsigned int *data)
 {
 	struct cb_pcimdas_private *devpriv = dev->private;
 	unsigned int chan = CR_CHAN(insn->chanspec);
 	unsigned int range = CR_RANGE(insn->chanspec);
 	int n;
 	unsigned int d;
 	int ret;

 	/*  only support sw initiated reads from a single channel */

 	/* configure for sw initiated read */
 	d = inb(devpriv->BADR3 + PCIMDAS_PACER_REG);
 	if ((d & PCIMDAS_PACER_SRC_MASK) != PCIMDAS_PACER_SRC_POLLED) {
 		d &= ~PCIMDAS_PACER_SRC_MASK;
 		d |= PCIMDAS_PACER_SRC_POLLED;
 		outb(d, devpriv->BADR3 + PCIMDAS_PACER_REG);
 	}

 	/* set bursting off, conversions on */
 	outb(PCIMDAS_BURST_CONV_EN, devpriv->BADR3 + PCIMDAS_BURST_REG);

 	/* set range */
 	outb(range, devpriv->BADR3 + PCIMDAS_GAIN_REG);

 	/* set mux for single channel scan */
 	outb(PCIMDAS_MUX(chan, chan), devpriv->BADR3 + PCIMDAS_MUX_REG);

 	/* convert n samples */
 	for (n = 0; n < insn->n; n++) {
 		/* trigger conversion */
 		outw(0, devpriv->daqio + PCIMDAS_AI_SOFTTRIG_REG);

 		/* wait for conversion to end */
 		ret = comedi_timeout(dev, s, insn, cb_pcimdas_ai_eoc, 0);
 		if (ret)
 			return ret;

 		/* read data */
 		data[n] = inw(devpriv->daqio + PCIMDAS_AI_REG);
 	}

 	/* return the number of samples read/written */
 	return n;
 }

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

 	for (i = 0; i < insn->n; i++) {
 		val = data[i];
 		outw(val, devpriv->daqio + PCIMDAS_AO_REG(chan));
 	}
 	s->readback[chan] = val;

 	return insn->n;
 }

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

 	val = inb(devpriv->BADR3 + PCIMDAS_DI_DO_REG);

 	data[1] = val & 0x0f;

 	return insn->n;
 }

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

 	if (comedi_dio_update_state(s, data))
 		outb(s->state, devpriv->BADR3 + PCIMDAS_DI_DO_REG);

 	data[1] = s->state;

 	return insn->n;
 }

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

 	switch (data[0]) {
 	case INSN_CONFIG_SET_CLOCK_SRC:
 		switch (data[1]) {
 		case 0:	/* internal 100 kHz clock */
 			ctrl = PCIMDAS_USER_CNTR_CTR1_CLK_SEL;
 			break;
 		case 1:	/* external clk on pin 21 */
 			ctrl = 0;
 			break;
 		default:
 			return -EINVAL;
 		}
 		outb(ctrl, devpriv->BADR3 + PCIMDAS_USER_CNTR_REG);
 		break;
 	case INSN_CONFIG_GET_CLOCK_SRC:
 		ctrl = inb(devpriv->BADR3 + PCIMDAS_USER_CNTR_REG);
 		if (ctrl & PCIMDAS_USER_CNTR_CTR1_CLK_SEL) {
 			data[1] = 0;
 			data[2] = I8254_OSC_BASE_100KHZ;
 		} else {
 			data[1] = 1;
 			data[2] = 0;
 		}
 		break;
 	default:
 		return -EINVAL;
 	}

 	return insn->n;
 }

 static unsigned int cb_pcimdas_pacer_clk(struct comedi_device *dev)
 {
 	struct cb_pcimdas_private *devpriv = dev->private;
 	unsigned int status;

 	/* The Pacer Clock jumper selects a 10 MHz or 1 MHz clock */
 	status = inb(devpriv->BADR3 + PCIMDAS_STATUS_REG);
 	if (status & PCIMDAS_STATUS_CLK)
 		return I8254_OSC_BASE_10MHZ;
 	return I8254_OSC_BASE_1MHZ;
 }

 static bool cb_pcimdas_is_ai_se(struct comedi_device *dev)
 {
 	struct cb_pcimdas_private *devpriv = dev->private;
 	unsigned int status;

 	/*
 	 * The number of Analog Input channels is set with the
 	 * Analog Input Mode Switch on the board. The board can
 	 * have 16 single-ended or 8 differential channels.
 	 */
 	status = inb(devpriv->BADR3 + PCIMDAS_STATUS_REG);
 	return status & PCIMDAS_STATUS_MUX;
 }

 static bool cb_pcimdas_is_ai_uni(struct comedi_device *dev)
 {
 	struct cb_pcimdas_private *devpriv = dev->private;
 	unsigned int status;

 	/*
 	 * The Analog Input range polarity is set with the
 	 * Analog Input Polarity Switch on the board. The
 	 * inputs can be set to Unipolar or Bipolar ranges.
 	 */
 	status = inb(devpriv->BADR3 + PCIMDAS_STATUS_REG);
 	return status & PCIMDAS_STATUS_UB;
 }

 static int cb_pcimdas_auto_attach(struct comedi_device *dev,
 				  unsigned long context_unused)
 {
 	struct pci_dev *pcidev = comedi_to_pci_dev(dev);
 	struct cb_pcimdas_private *devpriv;
 	struct comedi_subdevice *s;
 	int ret;

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

 	ret = comedi_pci_enable(dev);
 	if (ret)
 		return ret;

 	devpriv->daqio = pci_resource_start(pcidev, 2);
 	devpriv->BADR3 = pci_resource_start(pcidev, 3);
 	dev->iobase = pci_resource_start(pcidev, 4);

 	dev->pacer = comedi_8254_init(devpriv->BADR3 + PCIMDAS_8254_BASE,
 				      cb_pcimdas_pacer_clk(dev),
 				      I8254_IO8, 0);
 	if (!dev->pacer)
 		return -ENOMEM;

 	ret = comedi_alloc_subdevices(dev, 6);
 	if (ret)
 		return ret;

 	/* Analog Input subdevice */
 	s = &dev->subdevices[0];
 	s->type		= COMEDI_SUBD_AI;
 	s->subdev_flags	= SDF_READABLE;
 	if (cb_pcimdas_is_ai_se(dev)) {
 		s->subdev_flags	|= SDF_GROUND;
 		s->n_chan	= 16;
 	} else {
 		s->subdev_flags	|= SDF_DIFF;
 		s->n_chan	= 8;
 	}
 	s->maxdata	= 0xffff;
 	s->range_table	= cb_pcimdas_is_ai_uni(dev) ? &cb_pcimdas_ai_uni_range
 						    : &cb_pcimdas_ai_bip_range;
 	s->insn_read	= cb_pcimdas_ai_insn_read;

 	/* Analog Output subdevice */
 	s = &dev->subdevices[1];
 	s->type		= COMEDI_SUBD_AO;
 	s->subdev_flags	= SDF_WRITABLE;
 	s->n_chan	= 2;
 	s->maxdata	= 0xfff;
 	s->range_table	= &cb_pcimdas_ao_range;
 	s->insn_write	= cb_pcimdas_ao_insn_write;

 	ret = comedi_alloc_subdev_readback(s);
 	if (ret)
 		return ret;

 	/* Digital I/O subdevice */
 	s = &dev->subdevices[2];
 	ret = subdev_8255_init(dev, s, NULL, PCIMDAS_8255_BASE);
 	if (ret)
 		return ret;

 	/* Digital Input subdevice (main connector) */
 	s = &dev->subdevices[3];
 	s->type		= COMEDI_SUBD_DI;
 	s->subdev_flags	= SDF_READABLE;
 	s->n_chan	= 4;
 	s->maxdata	= 1;
 	s->range_table	= &range_digital;
 	s->insn_bits	= cb_pcimdas_di_insn_bits;

 	/* Digital Output subdevice (main connector) */
 	s = &dev->subdevices[4];
 	s->type		= COMEDI_SUBD_DO;
 	s->subdev_flags	= SDF_WRITABLE;
 	s->n_chan	= 4;
 	s->maxdata	= 1;
 	s->range_table	= &range_digital;
 	s->insn_bits	= cb_pcimdas_do_insn_bits;

 	/* Counter subdevice (8254) */
 	s = &dev->subdevices[5];
 	comedi_8254_subdevice_init(s, dev->pacer);

 	dev->pacer->insn_config = cb_pcimdas_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 cb_pcimdas_driver = {
 	.driver_name	= "cb_pcimdas",
 	.module		= THIS_MODULE,
 	.auto_attach	= cb_pcimdas_auto_attach,
 	.detach		= comedi_pci_detach,
 };

 static int cb_pcimdas_pci_probe(struct pci_dev *dev,
 				const struct pci_device_id *id)
 {
 	return comedi_pci_auto_config(dev, &cb_pcimdas_driver,
 				      id->driver_data);
 }

 static const struct pci_device_id cb_pcimdas_pci_table[] = {
 	{ PCI_DEVICE(PCI_VENDOR_ID_CB, 0x0056) },	/* PCIM-DAS1602/16 */
 	{ PCI_DEVICE(PCI_VENDOR_ID_CB, 0x0115) },	/* PCIe-DAS1602/16 */
 	{ 0 }
 };
 MODULE_DEVICE_TABLE(pci, cb_pcimdas_pci_table);

 static struct pci_driver cb_pcimdas_pci_driver = {
 	.name		= "cb_pcimdas",
 	.id_table	= cb_pcimdas_pci_table,
 	.probe		= cb_pcimdas_pci_probe,
 	.remove		= comedi_pci_auto_unconfig,
 };
 module_comedi_pci_driver(cb_pcimdas_driver, cb_pcimdas_pci_driver);

 MODULE_AUTHOR("Comedi https://www.comedi.org");
 MODULE_DESCRIPTION("Comedi driver for PCIM-DAS1602/16 and PCIe-DAS1602/16");
 MODULE_LICENSE("GPL");
	// SPDX-License-Identifier: GPL-2.0+
	/*
	* comedi/drivers/cb_pcimdas.c
	* Comedi driver for Computer Boards PCIM-DAS1602/16 and PCIe-DAS1602/16
	*
	* COMEDI - Linux Control and Measurement Device Interface
	* Copyright (C) 2000 David A. Schleef <ds@schleef.org>
	*/

	/*
	* Driver: cb_pcimdas
	* Description: Measurement Computing PCI Migration series boards
	* Devices: [ComputerBoards] PCIM-DAS1602/16 (cb_pcimdas), PCIe-DAS1602/16
	* Author: Richard Bytheway
	* Updated: Mon, 13 Oct 2014 11:57:39 +0000
	* Status: experimental
	*
	* Written to support the PCIM-DAS1602/16 and PCIe-DAS1602/16.
	*
	* Configuration Options:
	* none
	*
	* Manual configuration of PCI(e) cards is not supported; they are configured
	* automatically.
	*
	* Developed from cb_pcidas and skel by Richard Bytheway (mocelet@sucs.org).
	* Only supports DIO, AO and simple AI in it's present form.
	* No interrupts, multi channel or FIFO AI,
	* although the card looks like it could support this.
	*
	* https://www.mccdaq.com/PDFs/Manuals/pcim-das1602-16.pdf
	* https://www.mccdaq.com/PDFs/Manuals/pcie-das1602-16.pdf
	*/

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

	#include "../comedi_pci.h"

	#include "comedi_8254.h"
	#include "plx9052.h"
	#include "8255.h"

	/*
	* PCI Bar 1 Register map
	* see plx9052.h for register and bit defines
	*/

	/*
	* PCI Bar 2 Register map (devpriv->daqio)
	*/
	#define PCIMDAS_AI_REG 0x00
	#define PCIMDAS_AI_SOFTTRIG_REG 0x00
	#define PCIMDAS_AO_REG(x) (0x02 + ((x) * 2))

	/*
	* PCI Bar 3 Register map (devpriv->BADR3)
	*/
	#define PCIMDAS_MUX_REG 0x00
	#define PCIMDAS_MUX(_lo, _hi) ((_lo) \| ((_hi) << 4))
	#define PCIMDAS_DI_DO_REG 0x01
	#define PCIMDAS_STATUS_REG 0x02
	#define PCIMDAS_STATUS_EOC BIT(7)
	#define PCIMDAS_STATUS_UB BIT(6)
	#define PCIMDAS_STATUS_MUX BIT(5)
	#define PCIMDAS_STATUS_CLK BIT(4)
	#define PCIMDAS_STATUS_TO_CURR_MUX(x) ((x) & 0xf)
	#define PCIMDAS_CONV_STATUS_REG 0x03
	#define PCIMDAS_CONV_STATUS_EOC BIT(7)
	#define PCIMDAS_CONV_STATUS_EOB BIT(6)
	#define PCIMDAS_CONV_STATUS_EOA BIT(5)
	#define PCIMDAS_CONV_STATUS_FNE BIT(4)
	#define PCIMDAS_CONV_STATUS_FHF BIT(3)
	#define PCIMDAS_CONV_STATUS_OVERRUN BIT(2)
	#define PCIMDAS_IRQ_REG 0x04
	#define PCIMDAS_IRQ_INTE BIT(7)
	#define PCIMDAS_IRQ_INT BIT(6)
	#define PCIMDAS_IRQ_OVERRUN BIT(4)
	#define PCIMDAS_IRQ_EOA BIT(3)
	#define PCIMDAS_IRQ_EOA_INT_SEL BIT(2)
	#define PCIMDAS_IRQ_INTSEL(x) ((x) << 0)
	#define PCIMDAS_IRQ_INTSEL_EOC PCIMDAS_IRQ_INTSEL(0)
	#define PCIMDAS_IRQ_INTSEL_FNE PCIMDAS_IRQ_INTSEL(1)
	#define PCIMDAS_IRQ_INTSEL_EOB PCIMDAS_IRQ_INTSEL(2)
	#define PCIMDAS_IRQ_INTSEL_FHF_EOA PCIMDAS_IRQ_INTSEL(3)
	#define PCIMDAS_PACER_REG 0x05
	#define PCIMDAS_PACER_GATE_STATUS BIT(6)
	#define PCIMDAS_PACER_GATE_POL BIT(5)
	#define PCIMDAS_PACER_GATE_LATCH BIT(4)
	#define PCIMDAS_PACER_GATE_EN BIT(3)
	#define PCIMDAS_PACER_EXT_PACER_POL BIT(2)
	#define PCIMDAS_PACER_SRC(x) ((x) << 0)
	#define PCIMDAS_PACER_SRC_POLLED PCIMDAS_PACER_SRC(0)
	#define PCIMDAS_PACER_SRC_EXT PCIMDAS_PACER_SRC(2)
	#define PCIMDAS_PACER_SRC_INT PCIMDAS_PACER_SRC(3)
	#define PCIMDAS_PACER_SRC_MASK (3 << 0)
	#define PCIMDAS_BURST_REG 0x06
	#define PCIMDAS_BURST_BME BIT(1)
	#define PCIMDAS_BURST_CONV_EN BIT(0)
	#define PCIMDAS_GAIN_REG 0x07
	#define PCIMDAS_8254_BASE 0x08
	#define PCIMDAS_USER_CNTR_REG 0x0c
	#define PCIMDAS_USER_CNTR_CTR1_CLK_SEL BIT(0)
	#define PCIMDAS_RESIDUE_MSB_REG 0x0d
	#define PCIMDAS_RESIDUE_LSB_REG 0x0e

	/*
	* PCI Bar 4 Register map (dev->iobase)
	*/
	#define PCIMDAS_8255_BASE 0x00

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

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

	/*
	* The Analog Output range is not programmable. The DAC ranges are
	* jumper-settable on the board. The settings are not software-readable.
	*/
	static const struct comedi_lrange cb_pcimdas_ao_range = {
	6, {
	BIP_RANGE(10),
	BIP_RANGE(5),
	UNI_RANGE(10),
	UNI_RANGE(5),
	RANGE_ext(-1, 1),
	RANGE_ext(0, 1)
	}
	};

	/*
	* this structure is for data unique to this hardware driver. If
	* several hardware drivers keep similar information in this structure,
	* feel free to suggest moving the variable to the struct comedi_device
	* struct.
	*/
	struct cb_pcimdas_private {
	/* base addresses */
	unsigned long daqio;
	unsigned long BADR3;
	};

	static int cb_pcimdas_ai_eoc(struct comedi_device *dev,
	struct comedi_subdevice *s,
	struct comedi_insn *insn,
	unsigned long context)
	{
	struct cb_pcimdas_private *devpriv = dev->private;
	unsigned int status;

	status = inb(devpriv->BADR3 + PCIMDAS_STATUS_REG);
	if ((status & PCIMDAS_STATUS_EOC) == 0)
	return 0;
	return -EBUSY;
	}

	static int cb_pcimdas_ai_insn_read(struct comedi_device *dev,
	struct comedi_subdevice *s,
	struct comedi_insn *insn,
	unsigned int *data)
	{
	struct cb_pcimdas_private *devpriv = dev->private;
	unsigned int chan = CR_CHAN(insn->chanspec);
	unsigned int range = CR_RANGE(insn->chanspec);
	int n;
	unsigned int d;
	int ret;

	/* only support sw initiated reads from a single channel */

	/* configure for sw initiated read */
	d = inb(devpriv->BADR3 + PCIMDAS_PACER_REG);
	if ((d & PCIMDAS_PACER_SRC_MASK) != PCIMDAS_PACER_SRC_POLLED) {
	d &= ~PCIMDAS_PACER_SRC_MASK;
	d \|= PCIMDAS_PACER_SRC_POLLED;
	outb(d, devpriv->BADR3 + PCIMDAS_PACER_REG);
	}

	/* set bursting off, conversions on */
	outb(PCIMDAS_BURST_CONV_EN, devpriv->BADR3 + PCIMDAS_BURST_REG);

	/* set range */
	outb(range, devpriv->BADR3 + PCIMDAS_GAIN_REG);

	/* set mux for single channel scan */
	outb(PCIMDAS_MUX(chan, chan), devpriv->BADR3 + PCIMDAS_MUX_REG);

	/* convert n samples */
	for (n = 0; n < insn->n; n++) {
	/* trigger conversion */
	outw(0, devpriv->daqio + PCIMDAS_AI_SOFTTRIG_REG);

	/* wait for conversion to end */
	ret = comedi_timeout(dev, s, insn, cb_pcimdas_ai_eoc, 0);
	if (ret)
	return ret;

	/* read data */
	data[n] = inw(devpriv->daqio + PCIMDAS_AI_REG);
	}

	/* return the number of samples read/written */
	return n;
	}

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

	for (i = 0; i < insn->n; i++) {
	val = data[i];
	outw(val, devpriv->daqio + PCIMDAS_AO_REG(chan));
	}
	s->readback[chan] = val;

	return insn->n;
	}

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

	val = inb(devpriv->BADR3 + PCIMDAS_DI_DO_REG);

	data[1] = val & 0x0f;

	return insn->n;
	}

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

	if (comedi_dio_update_state(s, data))
	outb(s->state, devpriv->BADR3 + PCIMDAS_DI_DO_REG);

	data[1] = s->state;

	return insn->n;
	}

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

	switch (data[0]) {
	case INSN_CONFIG_SET_CLOCK_SRC:
	switch (data[1]) {
	case 0: /* internal 100 kHz clock */
	ctrl = PCIMDAS_USER_CNTR_CTR1_CLK_SEL;
	break;
	case 1: /* external clk on pin 21 */
	ctrl = 0;
	break;
	default:
	return -EINVAL;
	}
	outb(ctrl, devpriv->BADR3 + PCIMDAS_USER_CNTR_REG);
	break;
	case INSN_CONFIG_GET_CLOCK_SRC:
	ctrl = inb(devpriv->BADR3 + PCIMDAS_USER_CNTR_REG);
	if (ctrl & PCIMDAS_USER_CNTR_CTR1_CLK_SEL) {
	data[1] = 0;
	data[2] = I8254_OSC_BASE_100KHZ;
	} else {
	data[1] = 1;
	data[2] = 0;
	}
	break;
	default:
	return -EINVAL;
	}

	return insn->n;
	}

	static unsigned int cb_pcimdas_pacer_clk(struct comedi_device *dev)
	{
	struct cb_pcimdas_private *devpriv = dev->private;
	unsigned int status;

	/* The Pacer Clock jumper selects a 10 MHz or 1 MHz clock */
	status = inb(devpriv->BADR3 + PCIMDAS_STATUS_REG);
	if (status & PCIMDAS_STATUS_CLK)
	return I8254_OSC_BASE_10MHZ;
	return I8254_OSC_BASE_1MHZ;
	}

	static bool cb_pcimdas_is_ai_se(struct comedi_device *dev)
	{
	struct cb_pcimdas_private *devpriv = dev->private;
	unsigned int status;

	/*
	* The number of Analog Input channels is set with the
	* Analog Input Mode Switch on the board. The board can
	* have 16 single-ended or 8 differential channels.
	*/
	status = inb(devpriv->BADR3 + PCIMDAS_STATUS_REG);
	return status & PCIMDAS_STATUS_MUX;
	}

	static bool cb_pcimdas_is_ai_uni(struct comedi_device *dev)
	{
	struct cb_pcimdas_private *devpriv = dev->private;
	unsigned int status;

	/*
	* The Analog Input range polarity is set with the
	* Analog Input Polarity Switch on the board. The
	* inputs can be set to Unipolar or Bipolar ranges.
	*/
	status = inb(devpriv->BADR3 + PCIMDAS_STATUS_REG);
	return status & PCIMDAS_STATUS_UB;
	}

	static int cb_pcimdas_auto_attach(struct comedi_device *dev,
	unsigned long context_unused)
	{
	struct pci_dev *pcidev = comedi_to_pci_dev(dev);
	struct cb_pcimdas_private *devpriv;
	struct comedi_subdevice *s;
	int ret;

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

	ret = comedi_pci_enable(dev);
	if (ret)
	return ret;

	devpriv->daqio = pci_resource_start(pcidev, 2);
	devpriv->BADR3 = pci_resource_start(pcidev, 3);
	dev->iobase = pci_resource_start(pcidev, 4);

	dev->pacer = comedi_8254_init(devpriv->BADR3 + PCIMDAS_8254_BASE,
	cb_pcimdas_pacer_clk(dev),
	I8254_IO8, 0);
	if (!dev->pacer)
	return -ENOMEM;

	ret = comedi_alloc_subdevices(dev, 6);
	if (ret)
	return ret;

	/* Analog Input subdevice */
	s = &dev->subdevices[0];
	s->type = COMEDI_SUBD_AI;
	s->subdev_flags = SDF_READABLE;
	if (cb_pcimdas_is_ai_se(dev)) {
	s->subdev_flags \|= SDF_GROUND;
	s->n_chan = 16;
	} else {
	s->subdev_flags \|= SDF_DIFF;
	s->n_chan = 8;
	}
	s->maxdata = 0xffff;
	s->range_table = cb_pcimdas_is_ai_uni(dev) ? &cb_pcimdas_ai_uni_range
	: &cb_pcimdas_ai_bip_range;
	s->insn_read = cb_pcimdas_ai_insn_read;

	/* Analog Output subdevice */
	s = &dev->subdevices[1];
	s->type = COMEDI_SUBD_AO;
	s->subdev_flags = SDF_WRITABLE;
	s->n_chan = 2;
	s->maxdata = 0xfff;
	s->range_table = &cb_pcimdas_ao_range;
	s->insn_write = cb_pcimdas_ao_insn_write;

	ret = comedi_alloc_subdev_readback(s);
	if (ret)
	return ret;

	/* Digital I/O subdevice */
	s = &dev->subdevices[2];
	ret = subdev_8255_init(dev, s, NULL, PCIMDAS_8255_BASE);
	if (ret)
	return ret;

	/* Digital Input subdevice (main connector) */
	s = &dev->subdevices[3];
	s->type = COMEDI_SUBD_DI;
	s->subdev_flags = SDF_READABLE;
	s->n_chan = 4;
	s->maxdata = 1;
	s->range_table = &range_digital;
	s->insn_bits = cb_pcimdas_di_insn_bits;

	/* Digital Output subdevice (main connector) */
	s = &dev->subdevices[4];
	s->type = COMEDI_SUBD_DO;
	s->subdev_flags = SDF_WRITABLE;
	s->n_chan = 4;
	s->maxdata = 1;
	s->range_table = &range_digital;
	s->insn_bits = cb_pcimdas_do_insn_bits;

	/* Counter subdevice (8254) */
	s = &dev->subdevices[5];
	comedi_8254_subdevice_init(s, dev->pacer);

	dev->pacer->insn_config = cb_pcimdas_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 cb_pcimdas_driver = {
	.driver_name = "cb_pcimdas",
	.module = THIS_MODULE,
	.auto_attach = cb_pcimdas_auto_attach,
	.detach = comedi_pci_detach,
	};

	static int cb_pcimdas_pci_probe(struct pci_dev *dev,
	const struct pci_device_id *id)
	{
	return comedi_pci_auto_config(dev, &cb_pcimdas_driver,
	id->driver_data);
	}

	static const struct pci_device_id cb_pcimdas_pci_table[] = {
	{ PCI_DEVICE(PCI_VENDOR_ID_CB, 0x0056) }, /* PCIM-DAS1602/16 */
	{ PCI_DEVICE(PCI_VENDOR_ID_CB, 0x0115) }, /* PCIe-DAS1602/16 */
	{ 0 }
	};
	MODULE_DEVICE_TABLE(pci, cb_pcimdas_pci_table);

	static struct pci_driver cb_pcimdas_pci_driver = {
	.name = "cb_pcimdas",
	.id_table = cb_pcimdas_pci_table,
	.probe = cb_pcimdas_pci_probe,
	.remove = comedi_pci_auto_unconfig,
	};
	module_comedi_pci_driver(cb_pcimdas_driver, cb_pcimdas_pci_driver);

	MODULE_AUTHOR("Comedi https://www.comedi.org");
	MODULE_DESCRIPTION("Comedi driver for PCIM-DAS1602/16 and PCIe-DAS1602/16");
	MODULE_LICENSE("GPL");