drivers/staging/comedi/drivers/mpc624.c - kernel/skids - Git at Google

 /*
     comedi/drivers/mpc624.c
     Hardware driver for a Micro/sys inc. MPC-624 PC/104 board

     COMEDI - Linux Control and Measurement Device Interface
     Copyright (C) 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.

 */
 /*
 Driver: mpc624
 Description: Micro/sys MPC-624 PC/104 board
 Devices: [Micro/sys] MPC-624 (mpc624)
 Author: Stanislaw Raczynski <sraczynski@op.pl>
 Updated: Thu, 15 Sep 2005 12:01:18 +0200
 Status: working

     The Micro/sys MPC-624 board is based on the LTC2440 24-bit sigma-delta
     ADC chip.

     Subdevices supported by the driver:
     - Analog In:   supported
     - Digital I/O: not supported
     - LEDs:        not supported
     - EEPROM:      not supported

 Configuration Options:
   [0] - I/O base address
   [1] - convertion rate
 	Convertion rate  RMS noise  Effective Number Of Bits
 	0      3.52kHz        23uV                17
 	1      1.76kHz       3.5uV                20
 	2       880Hz         2uV                21.3
 	3       440Hz        1.4uV               21.8
 	4       220Hz         1uV                22.4
 	5       110Hz        750uV               22.9
 	6       55Hz         510nV               23.4
 	7      27.5Hz        375nV                24
 	8      13.75Hz       250nV               24.4
 	9      6.875Hz       200nV               24.6
   [2] - voltage range
 	0      -1.01V .. +1.01V
 	1      -10.1V .. +10.1V
 */

 #include "../comedidev.h"

 #include <linux/ioport.h>
 #include <linux/delay.h>

 /* Consecutive I/O port addresses */
 #define MPC624_SIZE             16

 /* Offsets of different ports */
 #define MPC624_MASTER_CONTROL	0 /* not used */
 #define MPC624_GNMUXCH          1 /* Gain, Mux, Channel of ADC */
 #define MPC624_ADC              2 /* read/write to/from ADC */
 #define MPC624_EE               3 /* read/write to/from serial EEPROM via I2C */
 #define MPC624_LEDS             4 /* write to LEDs */
 #define MPC624_DIO              5 /* read/write to/from digital I/O ports */
 #define MPC624_IRQ_MASK         6 /* IRQ masking enable/disable */

 /* Register bits' names */
 #define MPC624_ADBUSY           (1<<5)
 #define MPC624_ADSDO            (1<<4)
 #define MPC624_ADFO             (1<<3)
 #define MPC624_ADCS             (1<<2)
 #define MPC624_ADSCK            (1<<1)
 #define MPC624_ADSDI            (1<<0)

 /* SDI Speed/Resolution Programming bits */
 #define MPC624_OSR4             (1<<31)
 #define MPC624_OSR3             (1<<30)
 #define MPC624_OSR2             (1<<29)
 #define MPC624_OSR1             (1<<28)
 #define MPC624_OSR0             (1<<27)

 /* 32-bit output value bits' names */
 #define MPC624_EOC_BIT          (1<<31)
 #define MPC624_DMY_BIT          (1<<30)
 #define MPC624_SGN_BIT          (1<<29)

 /* Convertion speeds */
 /* OSR4 OSR3 OSR2 OSR1 OSR0  Convertion rate  RMS noise  ENOB^
  *  X    0    0    0    1        3.52kHz        23uV      17
  *  X    0    0    1    0        1.76kHz       3.5uV      20
  *  X    0    0    1    1         880Hz         2uV      21.3
  *  X    0    1    0    0         440Hz        1.4uV     21.8
  *  X    0    1    0    1         220Hz         1uV      22.4
  *  X    0    1    1    0         110Hz        750uV     22.9
  *  X    0    1    1    1          55Hz        510nV     23.4
  *  X    1    0    0    0         27.5Hz       375nV      24
  *  X    1    0    0    1        13.75Hz       250nV     24.4
  *  X    1    1    1    1        6.875Hz       200nV     24.6
  *
  * ^ - Effective Number Of Bits
  */

 #define MPC624_SPEED_3_52_kHz (MPC624_OSR4 | MPC624_OSR0)
 #define MPC624_SPEED_1_76_kHz (MPC624_OSR4 | MPC624_OSR1)
 #define MPC624_SPEED_880_Hz   (MPC624_OSR4 | MPC624_OSR1 | MPC624_OSR0)
 #define MPC624_SPEED_440_Hz   (MPC624_OSR4 | MPC624_OSR2)
 #define MPC624_SPEED_220_Hz   (MPC624_OSR4 | MPC624_OSR2 | MPC624_OSR0)
 #define MPC624_SPEED_110_Hz   (MPC624_OSR4 | MPC624_OSR2 | MPC624_OSR1)
 #define MPC624_SPEED_55_Hz \
 	(MPC624_OSR4 | MPC624_OSR2 | MPC624_OSR1 | MPC624_OSR0)
 #define MPC624_SPEED_27_5_Hz  (MPC624_OSR4 | MPC624_OSR3)
 #define MPC624_SPEED_13_75_Hz (MPC624_OSR4 | MPC624_OSR3 | MPC624_OSR0)
 #define MPC624_SPEED_6_875_Hz \
 	(MPC624_OSR4 | MPC624_OSR3 | MPC624_OSR2 | MPC624_OSR1 | MPC624_OSR0)
 /* -------------------------------------------------------------------------- */
 struct skel_private {

 	/*  set by mpc624_attach() from driver's parameters */
 	unsigned long int ulConvertionRate;
 };

 #define devpriv ((struct skel_private *)dev->private)
 /* -------------------------------------------------------------------------- */
 static const struct comedi_lrange range_mpc624_bipolar1 = {
 	1,
 	{
 /* BIP_RANGE(1.01)  this is correct, */
 	 /*  but my MPC-624 actually seems to have a range of 2.02 */
 	 BIP_RANGE(2.02)
 	 }
 };

 static const struct comedi_lrange range_mpc624_bipolar10 = {
 	1,
 	{
 /* BIP_RANGE(10.1)   this is correct, */
 	 /*  but my MPC-624 actually seems to have a range of 20.2 */
 	 BIP_RANGE(20.2)
 	 }
 };

 /* -------------------------------------------------------------------------- */
 static int mpc624_attach(struct comedi_device *dev,
 			 struct comedi_devconfig *it);
 static int mpc624_detach(struct comedi_device *dev);
 /* -------------------------------------------------------------------------- */
 static struct comedi_driver driver_mpc624 = {
 	.driver_name = "mpc624",
 	.module = THIS_MODULE,
 	.attach = mpc624_attach,
 	.detach = mpc624_detach
 };

 /* -------------------------------------------------------------------------- */
 static int mpc624_ai_rinsn(struct comedi_device *dev,
 			   struct comedi_subdevice *s, struct comedi_insn *insn,
 			   unsigned int *data);
 /* -------------------------------------------------------------------------- */
 static int mpc624_attach(struct comedi_device *dev, struct comedi_devconfig *it)
 {
 	struct comedi_subdevice *s;
 	unsigned long iobase;

 	iobase = it->options[0];
 	printk(KERN_INFO "comedi%d: mpc624 [0x%04lx, ", dev->minor, iobase);
 	if (request_region(iobase, MPC624_SIZE, "mpc624") == NULL) {
 		printk(KERN_ERR "I/O port(s) in use\n");
 		return -EIO;
 	}

 	dev->iobase = iobase;
 	dev->board_name = "mpc624";

 	/*  Private structure initialization */
 	if (alloc_private(dev, sizeof(struct skel_private)) < 0)
 		return -ENOMEM;

 	switch (it->options[1]) {
 	case 0:
 		devpriv->ulConvertionRate = MPC624_SPEED_3_52_kHz;
 		printk(KERN_INFO "3.52 kHz, ");
 		break;
 	case 1:
 		devpriv->ulConvertionRate = MPC624_SPEED_1_76_kHz;
 		printk(KERN_INFO "1.76 kHz, ");
 		break;
 	case 2:
 		devpriv->ulConvertionRate = MPC624_SPEED_880_Hz;
 		printk(KERN_INFO "880 Hz, ");
 		break;
 	case 3:
 		devpriv->ulConvertionRate = MPC624_SPEED_440_Hz;
 		printk(KERN_INFO "440 Hz, ");
 		break;
 	case 4:
 		devpriv->ulConvertionRate = MPC624_SPEED_220_Hz;
 		printk(KERN_INFO "220 Hz, ");
 		break;
 	case 5:
 		devpriv->ulConvertionRate = MPC624_SPEED_110_Hz;
 		printk(KERN_INFO "110 Hz, ");
 		break;
 	case 6:
 		devpriv->ulConvertionRate = MPC624_SPEED_55_Hz;
 		printk(KERN_INFO "55 Hz, ");
 		break;
 	case 7:
 		devpriv->ulConvertionRate = MPC624_SPEED_27_5_Hz;
 		printk(KERN_INFO "27.5 Hz, ");
 		break;
 	case 8:
 		devpriv->ulConvertionRate = MPC624_SPEED_13_75_Hz;
 		printk(KERN_INFO "13.75 Hz, ");
 		break;
 	case 9:
 		devpriv->ulConvertionRate = MPC624_SPEED_6_875_Hz;
 		printk(KERN_INFO "6.875 Hz, ");
 		break;
 	default:
 		printk
 		    (KERN_ERR "illegal convertion rate setting!"
 			" Valid numbers are 0..9. Using 9 => 6.875 Hz, ");
 		devpriv->ulConvertionRate = MPC624_SPEED_3_52_kHz;
 	}

 	/*  Subdevices structures */
 	if (alloc_subdevices(dev, 1) < 0)
 		return -ENOMEM;

 	s = dev->subdevices + 0;
 	s->type = COMEDI_SUBD_AI;
 	s->subdev_flags = SDF_READABLE | SDF_DIFF;
 	s->n_chan = 8;
 	switch (it->options[1]) {
 	default:
 		s->maxdata = 0x3FFFFFFF;
 		printk(KERN_INFO "30 bit, ");
 	}

 	switch (it->options[1]) {
 	case 0:
 		s->range_table = &range_mpc624_bipolar1;
 		printk(KERN_INFO "1.01V]: ");
 		break;
 	default:
 		s->range_table = &range_mpc624_bipolar10;
 		printk(KERN_INFO "10.1V]: ");
 	}
 	s->len_chanlist = 1;
 	s->insn_read = mpc624_ai_rinsn;

 	printk(KERN_INFO "attached\n");

 	return 1;
 }

 static int mpc624_detach(struct comedi_device *dev)
 {
 	printk(KERN_INFO "comedi%d: mpc624: remove\n", dev->minor);

 	if (dev->iobase)
 		release_region(dev->iobase, MPC624_SIZE);

 	return 0;
 }

 /* Timeout 200ms */
 #define TIMEOUT 200

 static int mpc624_ai_rinsn(struct comedi_device *dev,
 			   struct comedi_subdevice *s, struct comedi_insn *insn,
 			   unsigned int *data)
 {
 	int n, i;
 	unsigned long int data_in, data_out;
 	unsigned char ucPort;

 	/*
 	 *  WARNING:
 	 *  We always write 0 to GNSWA bit, so the channel range is +-/10.1Vdc
 	 */
 	outb(insn->chanspec, dev->iobase + MPC624_GNMUXCH);
 /* printk("Channel %d:\n", insn->chanspec); */
 	if (!insn->n) {
 		printk(KERN_INFO "MPC624: Warning, no data to acquire\n");
 		return 0;
 	}

 	for (n = 0; n < insn->n; n++) {
 		/*  Trigger the convertion */
 		outb(MPC624_ADSCK, dev->iobase + MPC624_ADC);
 		udelay(1);
 		outb(MPC624_ADCS | MPC624_ADSCK, dev->iobase + MPC624_ADC);
 		udelay(1);
 		outb(0, dev->iobase + MPC624_ADC);
 		udelay(1);

 		/*  Wait for the convertion to end */
 		for (i = 0; i < TIMEOUT; i++) {
 			ucPort = inb(dev->iobase + MPC624_ADC);
 			if (ucPort & MPC624_ADBUSY)
 				udelay(1000);
 			else
 				break;
 		}
 		if (i == TIMEOUT) {
 			printk(KERN_ERR "MPC624: timeout (%dms)\n", TIMEOUT);
 			data[n] = 0;
 			return -ETIMEDOUT;
 		}
 		/*  Start reading data */
 		data_in = 0;
 		data_out = devpriv->ulConvertionRate;
 		udelay(1);
 		for (i = 0; i < 32; i++) {
 			/*  Set the clock low */
 			outb(0, dev->iobase + MPC624_ADC);
 			udelay(1);

 			if (data_out & (1 << 31)) { /*  the next bit is a 1 */
 				/*  Set the ADSDI line (send to MPC624) */
 				outb(MPC624_ADSDI, dev->iobase + MPC624_ADC);
 				udelay(1);
 				/*  Set the clock high */
 				outb(MPC624_ADSCK | MPC624_ADSDI,
 				     dev->iobase + MPC624_ADC);
 			} else {	/*  the next bit is a 0 */

 				/*  Set the ADSDI line (send to MPC624) */
 				outb(0, dev->iobase + MPC624_ADC);
 				udelay(1);
 				/*  Set the clock high */
 				outb(MPC624_ADSCK, dev->iobase + MPC624_ADC);
 			}
 			/*  Read ADSDO on high clock (receive from MPC624) */
 			udelay(1);
 			data_in <<= 1;
 			data_in |=
 			    (inb(dev->iobase + MPC624_ADC) & MPC624_ADSDO) >> 4;
 			udelay(1);

 			data_out <<= 1;
 		}

 		/*
 		 *  Received 32-bit long value consist of:
 		 *    31: EOC -
 		 *          (End Of Transmission) bit - should be 0
 		 *    30: DMY
 		 *          (Dummy) bit - should be 0
 		 *    29: SIG
 		 *          (Sign) bit- 1 if the voltage is positive,
 		 *                      0 if negative
 		 *    28: MSB
 		 *          (Most Significant Bit) - the first bit of
 		 *                                   the conversion result
 		 *    ....
 		 *    05: LSB
 		 *          (Least Significant Bit)- the last bit of the
 		 *                                   conversion result
 		 *    04-00: sub-LSB
 		 *          - sub-LSBs are basically noise, but when
 		 *            averaged properly, they can increase conversion
 		 *            precision up to 29 bits; they can be discarded
 		 *            without loss of resolution.
 		 */

 		if (data_in & MPC624_EOC_BIT)
 			printk(KERN_INFO "MPC624:EOC bit is set (data_in=%lu)!",
 			       data_in);
 		if (data_in & MPC624_DMY_BIT)
 			printk(KERN_INFO "MPC624:DMY bit is set (data_in=%lu)!",
 			       data_in);
 		if (data_in & MPC624_SGN_BIT) {	/* Volatge is positive */
 			/*
 			 * comedi operates on unsigned numbers, so mask off EOC
 			 * and DMY and don't clear the SGN bit
 			 */
 			data_in &= 0x3FFFFFFF;
 			data[n] = data_in;
 		} else { /*  The voltage is negative */
 			/*
 			 * data_in contains a number in 30-bit two's complement
 			 * code and we must deal with it
 			 */
 			data_in |= MPC624_SGN_BIT;
 			data_in = ~data_in;
 			data_in += 1;
 			data_in &= ~(MPC624_EOC_BIT | MPC624_DMY_BIT);
 			/*  clear EOC and DMY bits */
 			data_in = 0x20000000 - data_in;
 			data[n] = data_in;
 		}
 	}

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

 COMEDI_INITCLEANUP(driver_mpc624);
	/*
	comedi/drivers/mpc624.c
	Hardware driver for a Micro/sys inc. MPC-624 PC/104 board

	COMEDI - Linux Control and Measurement Device Interface
	Copyright (C) 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.

	*/
	/*
	Driver: mpc624
	Description: Micro/sys MPC-624 PC/104 board
	Devices: [Micro/sys] MPC-624 (mpc624)
	Author: Stanislaw Raczynski <sraczynski@op.pl>
	Updated: Thu, 15 Sep 2005 12:01:18 +0200
	Status: working

	The Micro/sys MPC-624 board is based on the LTC2440 24-bit sigma-delta
	ADC chip.

	Subdevices supported by the driver:
	- Analog In: supported
	- Digital I/O: not supported
	- LEDs: not supported
	- EEPROM: not supported

	Configuration Options:
	[0] - I/O base address
	[1] - convertion rate
	Convertion rate RMS noise Effective Number Of Bits
	0 3.52kHz 23uV 17
	1 1.76kHz 3.5uV 20
	2 880Hz 2uV 21.3
	3 440Hz 1.4uV 21.8
	4 220Hz 1uV 22.4
	5 110Hz 750uV 22.9
	6 55Hz 510nV 23.4
	7 27.5Hz 375nV 24
	8 13.75Hz 250nV 24.4
	9 6.875Hz 200nV 24.6
	[2] - voltage range
	0 -1.01V .. +1.01V
	1 -10.1V .. +10.1V
	*/

	#include "../comedidev.h"

	#include <linux/ioport.h>
	#include <linux/delay.h>

	/* Consecutive I/O port addresses */
	#define MPC624_SIZE 16

	/* Offsets of different ports */
	#define MPC624_MASTER_CONTROL 0 /* not used */
	#define MPC624_GNMUXCH 1 /* Gain, Mux, Channel of ADC */
	#define MPC624_ADC 2 /* read/write to/from ADC */
	#define MPC624_EE 3 /* read/write to/from serial EEPROM via I2C */
	#define MPC624_LEDS 4 /* write to LEDs */
	#define MPC624_DIO 5 /* read/write to/from digital I/O ports */
	#define MPC624_IRQ_MASK 6 /* IRQ masking enable/disable */

	/* Register bits' names */
	#define MPC624_ADBUSY (1<<5)
	#define MPC624_ADSDO (1<<4)
	#define MPC624_ADFO (1<<3)
	#define MPC624_ADCS (1<<2)
	#define MPC624_ADSCK (1<<1)
	#define MPC624_ADSDI (1<<0)

	/* SDI Speed/Resolution Programming bits */
	#define MPC624_OSR4 (1<<31)
	#define MPC624_OSR3 (1<<30)
	#define MPC624_OSR2 (1<<29)
	#define MPC624_OSR1 (1<<28)
	#define MPC624_OSR0 (1<<27)

	/* 32-bit output value bits' names */
	#define MPC624_EOC_BIT (1<<31)
	#define MPC624_DMY_BIT (1<<30)
	#define MPC624_SGN_BIT (1<<29)

	/* Convertion speeds */
	/* OSR4 OSR3 OSR2 OSR1 OSR0 Convertion rate RMS noise ENOB^
	* X 0 0 0 1 3.52kHz 23uV 17
	* X 0 0 1 0 1.76kHz 3.5uV 20
	* X 0 0 1 1 880Hz 2uV 21.3
	* X 0 1 0 0 440Hz 1.4uV 21.8
	* X 0 1 0 1 220Hz 1uV 22.4
	* X 0 1 1 0 110Hz 750uV 22.9
	* X 0 1 1 1 55Hz 510nV 23.4
	* X 1 0 0 0 27.5Hz 375nV 24
	* X 1 0 0 1 13.75Hz 250nV 24.4
	* X 1 1 1 1 6.875Hz 200nV 24.6
	*
	* ^ - Effective Number Of Bits
	*/

	#define MPC624_SPEED_3_52_kHz (MPC624_OSR4 \| MPC624_OSR0)
	#define MPC624_SPEED_1_76_kHz (MPC624_OSR4 \| MPC624_OSR1)
	#define MPC624_SPEED_880_Hz (MPC624_OSR4 \| MPC624_OSR1 \| MPC624_OSR0)
	#define MPC624_SPEED_440_Hz (MPC624_OSR4 \| MPC624_OSR2)
	#define MPC624_SPEED_220_Hz (MPC624_OSR4 \| MPC624_OSR2 \| MPC624_OSR0)
	#define MPC624_SPEED_110_Hz (MPC624_OSR4 \| MPC624_OSR2 \| MPC624_OSR1)
	#define MPC624_SPEED_55_Hz \
	(MPC624_OSR4 \| MPC624_OSR2 \| MPC624_OSR1 \| MPC624_OSR0)
	#define MPC624_SPEED_27_5_Hz (MPC624_OSR4 \| MPC624_OSR3)
	#define MPC624_SPEED_13_75_Hz (MPC624_OSR4 \| MPC624_OSR3 \| MPC624_OSR0)
	#define MPC624_SPEED_6_875_Hz \
	(MPC624_OSR4 \| MPC624_OSR3 \| MPC624_OSR2 \| MPC624_OSR1 \| MPC624_OSR0)
	/* -------------------------------------------------------------------------- */
	struct skel_private {

	/* set by mpc624_attach() from driver's parameters */
	unsigned long int ulConvertionRate;
	};

	#define devpriv ((struct skel_private *)dev->private)
	/* -------------------------------------------------------------------------- */
	static const struct comedi_lrange range_mpc624_bipolar1 = {
	1,
	{
	/* BIP_RANGE(1.01) this is correct, */
	/* but my MPC-624 actually seems to have a range of 2.02 */
	BIP_RANGE(2.02)
	}
	};

	static const struct comedi_lrange range_mpc624_bipolar10 = {
	1,
	{
	/* BIP_RANGE(10.1) this is correct, */
	/* but my MPC-624 actually seems to have a range of 20.2 */
	BIP_RANGE(20.2)
	}
	};

	/* -------------------------------------------------------------------------- */
	static int mpc624_attach(struct comedi_device *dev,
	struct comedi_devconfig *it);
	static int mpc624_detach(struct comedi_device *dev);
	/* -------------------------------------------------------------------------- */
	static struct comedi_driver driver_mpc624 = {
	.driver_name = "mpc624",
	.module = THIS_MODULE,
	.attach = mpc624_attach,
	.detach = mpc624_detach
	};

	/* -------------------------------------------------------------------------- */
	static int mpc624_ai_rinsn(struct comedi_device *dev,
	struct comedi_subdevice s, struct comedi_insn insn,
	unsigned int *data);
	/* -------------------------------------------------------------------------- */
	static int mpc624_attach(struct comedi_device dev, struct comedi_devconfig it)
	{
	struct comedi_subdevice *s;
	unsigned long iobase;

	iobase = it->options[0];
	printk(KERN_INFO "comedi%d: mpc624 [0x%04lx, ", dev->minor, iobase);
	if (request_region(iobase, MPC624_SIZE, "mpc624") == NULL) {
	printk(KERN_ERR "I/O port(s) in use\n");
	return -EIO;
	}

	dev->iobase = iobase;
	dev->board_name = "mpc624";

	/* Private structure initialization */
	if (alloc_private(dev, sizeof(struct skel_private)) < 0)
	return -ENOMEM;

	switch (it->options[1]) {
	case 0:
	devpriv->ulConvertionRate = MPC624_SPEED_3_52_kHz;
	printk(KERN_INFO "3.52 kHz, ");
	break;
	case 1:
	devpriv->ulConvertionRate = MPC624_SPEED_1_76_kHz;
	printk(KERN_INFO "1.76 kHz, ");
	break;
	case 2:
	devpriv->ulConvertionRate = MPC624_SPEED_880_Hz;
	printk(KERN_INFO "880 Hz, ");
	break;
	case 3:
	devpriv->ulConvertionRate = MPC624_SPEED_440_Hz;
	printk(KERN_INFO "440 Hz, ");
	break;
	case 4:
	devpriv->ulConvertionRate = MPC624_SPEED_220_Hz;
	printk(KERN_INFO "220 Hz, ");
	break;
	case 5:
	devpriv->ulConvertionRate = MPC624_SPEED_110_Hz;
	printk(KERN_INFO "110 Hz, ");
	break;
	case 6:
	devpriv->ulConvertionRate = MPC624_SPEED_55_Hz;
	printk(KERN_INFO "55 Hz, ");
	break;
	case 7:
	devpriv->ulConvertionRate = MPC624_SPEED_27_5_Hz;
	printk(KERN_INFO "27.5 Hz, ");
	break;
	case 8:
	devpriv->ulConvertionRate = MPC624_SPEED_13_75_Hz;
	printk(KERN_INFO "13.75 Hz, ");
	break;
	case 9:
	devpriv->ulConvertionRate = MPC624_SPEED_6_875_Hz;
	printk(KERN_INFO "6.875 Hz, ");
	break;
	default:
	printk
	(KERN_ERR "illegal convertion rate setting!"
	" Valid numbers are 0..9. Using 9 => 6.875 Hz, ");
	devpriv->ulConvertionRate = MPC624_SPEED_3_52_kHz;
	}

	/* Subdevices structures */
	if (alloc_subdevices(dev, 1) < 0)
	return -ENOMEM;

	s = dev->subdevices + 0;
	s->type = COMEDI_SUBD_AI;
	s->subdev_flags = SDF_READABLE \| SDF_DIFF;
	s->n_chan = 8;
	switch (it->options[1]) {
	default:
	s->maxdata = 0x3FFFFFFF;
	printk(KERN_INFO "30 bit, ");
	}

	switch (it->options[1]) {
	case 0:
	s->range_table = &range_mpc624_bipolar1;
	printk(KERN_INFO "1.01V]: ");
	break;
	default:
	s->range_table = &range_mpc624_bipolar10;
	printk(KERN_INFO "10.1V]: ");
	}
	s->len_chanlist = 1;
	s->insn_read = mpc624_ai_rinsn;

	printk(KERN_INFO "attached\n");

	return 1;
	}

	static int mpc624_detach(struct comedi_device *dev)
	{
	printk(KERN_INFO "comedi%d: mpc624: remove\n", dev->minor);

	if (dev->iobase)
	release_region(dev->iobase, MPC624_SIZE);

	return 0;
	}

	/* Timeout 200ms */
	#define TIMEOUT 200

	static int mpc624_ai_rinsn(struct comedi_device *dev,
	struct comedi_subdevice s, struct comedi_insn insn,
	unsigned int *data)
	{
	int n, i;
	unsigned long int data_in, data_out;
	unsigned char ucPort;

	/*
	* WARNING:
	* We always write 0 to GNSWA bit, so the channel range is +-/10.1Vdc
	*/
	outb(insn->chanspec, dev->iobase + MPC624_GNMUXCH);
	/* printk("Channel %d:\n", insn->chanspec); */
	if (!insn->n) {
	printk(KERN_INFO "MPC624: Warning, no data to acquire\n");
	return 0;
	}

	for (n = 0; n < insn->n; n++) {
	/* Trigger the convertion */
	outb(MPC624_ADSCK, dev->iobase + MPC624_ADC);
	udelay(1);
	outb(MPC624_ADCS \| MPC624_ADSCK, dev->iobase + MPC624_ADC);
	udelay(1);
	outb(0, dev->iobase + MPC624_ADC);
	udelay(1);

	/* Wait for the convertion to end */
	for (i = 0; i < TIMEOUT; i++) {
	ucPort = inb(dev->iobase + MPC624_ADC);
	if (ucPort & MPC624_ADBUSY)
	udelay(1000);
	else
	break;
	}
	if (i == TIMEOUT) {
	printk(KERN_ERR "MPC624: timeout (%dms)\n", TIMEOUT);
	data[n] = 0;
	return -ETIMEDOUT;
	}
	/* Start reading data */
	data_in = 0;
	data_out = devpriv->ulConvertionRate;
	udelay(1);
	for (i = 0; i < 32; i++) {
	/* Set the clock low */
	outb(0, dev->iobase + MPC624_ADC);
	udelay(1);

	if (data_out & (1 << 31)) { /* the next bit is a 1 */
	/* Set the ADSDI line (send to MPC624) */
	outb(MPC624_ADSDI, dev->iobase + MPC624_ADC);
	udelay(1);
	/* Set the clock high */
	outb(MPC624_ADSCK \| MPC624_ADSDI,
	dev->iobase + MPC624_ADC);
	} else { /* the next bit is a 0 */

	/* Set the ADSDI line (send to MPC624) */
	outb(0, dev->iobase + MPC624_ADC);
	udelay(1);
	/* Set the clock high */
	outb(MPC624_ADSCK, dev->iobase + MPC624_ADC);
	}
	/* Read ADSDO on high clock (receive from MPC624) */
	udelay(1);
	data_in <<= 1;
	data_in \|=
	(inb(dev->iobase + MPC624_ADC) & MPC624_ADSDO) >> 4;
	udelay(1);

	data_out <<= 1;
	}

	/*
	* Received 32-bit long value consist of:
	* 31: EOC -
	* (End Of Transmission) bit - should be 0
	* 30: DMY
	* (Dummy) bit - should be 0
	* 29: SIG
	* (Sign) bit- 1 if the voltage is positive,
	* 0 if negative
	* 28: MSB
	* (Most Significant Bit) - the first bit of
	* the conversion result
	* ....
	* 05: LSB
	* (Least Significant Bit)- the last bit of the
	* conversion result
	* 04-00: sub-LSB
	* - sub-LSBs are basically noise, but when
	* averaged properly, they can increase conversion
	* precision up to 29 bits; they can be discarded
	* without loss of resolution.
	*/

	if (data_in & MPC624_EOC_BIT)
	printk(KERN_INFO "MPC624:EOC bit is set (data_in=%lu)!",
	data_in);
	if (data_in & MPC624_DMY_BIT)
	printk(KERN_INFO "MPC624:DMY bit is set (data_in=%lu)!",
	data_in);
	if (data_in & MPC624_SGN_BIT) { /* Volatge is positive */
	/*
	* comedi operates on unsigned numbers, so mask off EOC
	* and DMY and don't clear the SGN bit
	*/
	data_in &= 0x3FFFFFFF;
	data[n] = data_in;
	} else { /* The voltage is negative */
	/*
	* data_in contains a number in 30-bit two's complement
	* code and we must deal with it
	*/
	data_in \|= MPC624_SGN_BIT;
	data_in = ~data_in;
	data_in += 1;
	data_in &= ~(MPC624_EOC_BIT \| MPC624_DMY_BIT);
	/* clear EOC and DMY bits */
	data_in = 0x20000000 - data_in;
	data[n] = data_in;
	}
	}

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

	COMEDI_INITCLEANUP(driver_mpc624);