xref: /drivers/staging/comedi/drivers/me_daq.c

/*

   comedi/drivers/me_daq.c

   Hardware driver for Meilhaus data acquisition cards:

     ME-2000i, ME-2600i, ME-3000vm1

   Copyright (C) 2002 Michael Hillmann <hillmann@syscongroup.de>

    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: me_daq
Description: Meilhaus PCI data acquisition cards
Author: Michael Hillmann <hillmann@syscongroup.de>
Devices: [Meilhaus] ME-2600i (me_daq), ME-2000i
Status: experimental

Supports:

    Analog Output

Configuration options:

    [0] - PCI bus number (optional)
    [1] - PCI slot number (optional)

    If bus/slot is not specified, the first available PCI
    device will be used.

The 2600 requires a firmware upload, which can be accomplished
using the -i or --init-data option of comedi_config.
The firmware can be
found in the comedi_nonfree_firmware tarball available
from http://www.comedi.org

*/

#include <linux/interrupt.h>
#include <linux/sched.h>
#include "../comedidev.h"

#include "comedi_pci.h"

/*#include "me2600_fw.h" */

#define ME_DRIVER_NAME		"me_daq"

#define PCI_VENDOR_ID_MEILHAUS	0x1402
#define ME2000_DEVICE_ID	0x2000
#define ME2600_DEVICE_ID	0x2600

#define PLX_INTCSR		0x4C	/* PLX interrupt status register */
#define XILINX_DOWNLOAD_RESET	0x42	/* Xilinx registers */

#define ME_CONTROL_1			0x0000	/* - | W */
#define   INTERRUPT_ENABLE		(1<<15)
#define   COUNTER_B_IRQ			(1<<12)
#define   COUNTER_A_IRQ			(1<<11)
#define   CHANLIST_READY_IRQ		(1<<10)
#define   EXT_IRQ			(1<<9)
#define   ADFIFO_HALFFULL_IRQ		(1<<8)
#define   SCAN_COUNT_ENABLE		(1<<5)
#define   SIMULTANEOUS_ENABLE		(1<<4)
#define   TRIGGER_FALLING_EDGE		(1<<3)
#define   CONTINUOUS_MODE		(1<<2)
#define   DISABLE_ADC			(0<<0)
#define   SOFTWARE_TRIGGERED_ADC	(1<<0)
#define   SCAN_TRIGGERED_ADC		(2<<0)
#define   EXT_TRIGGERED_ADC		(3<<0)
#define ME_ADC_START			0x0000	/* R | - */
#define ME_CONTROL_2			0x0002	/* - | W */
#define   ENABLE_ADFIFO			(1<<10)
#define   ENABLE_CHANLIST		(1<<9)
#define   ENABLE_PORT_B			(1<<7)
#define   ENABLE_PORT_A			(1<<6)
#define   ENABLE_COUNTER_B		(1<<4)
#define   ENABLE_COUNTER_A		(1<<3)
#define   ENABLE_DAC			(1<<1)
#define   BUFFERED_DAC			(1<<0)
#define ME_DAC_UPDATE			0x0002	/* R | - */
#define ME_STATUS			0x0004	/* R | - */
#define   COUNTER_B_IRQ_PENDING		(1<<12)
#define   COUNTER_A_IRQ_PENDING		(1<<11)
#define   CHANLIST_READY_IRQ_PENDING	(1<<10)
#define   EXT_IRQ_PENDING		(1<<9)
#define   ADFIFO_HALFFULL_IRQ_PENDING	(1<<8)
#define   ADFIFO_FULL			(1<<4)
#define   ADFIFO_HALFFULL		(1<<3)
#define   ADFIFO_EMPTY			(1<<2)
#define   CHANLIST_FULL			(1<<1)
#define   FST_ACTIVE			(1<<0)
#define ME_RESET_INTERRUPT		0x0004	/* - | W */
#define ME_DIO_PORT_A			0x0006	/* R | W */
#define ME_DIO_PORT_B			0x0008	/* R | W */
#define ME_TIMER_DATA_0			0x000A	/* - | W */
#define ME_TIMER_DATA_1			0x000C	/* - | W */
#define ME_TIMER_DATA_2			0x000E	/* - | W */
#define ME_CHANNEL_LIST			0x0010	/* - | W */
#define   ADC_UNIPOLAR			(1<<6)
#define   ADC_GAIN_0			(0<<4)
#define   ADC_GAIN_1			(1<<4)
#define   ADC_GAIN_2			(2<<4)
#define   ADC_GAIN_3			(3<<4)
#define ME_READ_AD_FIFO			0x0010	/* R | - */
#define ME_DAC_CONTROL			0x0012	/* - | W */
#define   DAC_UNIPOLAR_D		(0<<4)
#define   DAC_BIPOLAR_D			(1<<4)
#define   DAC_UNIPOLAR_C		(0<<5)
#define   DAC_BIPOLAR_C			(1<<5)
#define   DAC_UNIPOLAR_B		(0<<6)
#define   DAC_BIPOLAR_B			(1<<6)
#define   DAC_UNIPOLAR_A		(0<<7)
#define   DAC_BIPOLAR_A			(1<<7)
#define   DAC_GAIN_0_D			(0<<8)
#define   DAC_GAIN_1_D			(1<<8)
#define   DAC_GAIN_0_C			(0<<9)
#define   DAC_GAIN_1_C			(1<<9)
#define   DAC_GAIN_0_B			(0<<10)
#define   DAC_GAIN_1_B			(1<<10)
#define   DAC_GAIN_0_A			(0<<11)
#define   DAC_GAIN_1_A			(1<<11)
#define ME_DAC_CONTROL_UPDATE		0x0012	/* R | - */
#define ME_DAC_DATA_A			0x0014	/* - | W */
#define ME_DAC_DATA_B			0x0016	/* - | W */
#define ME_DAC_DATA_C			0x0018	/* - | W */
#define ME_DAC_DATA_D			0x001A	/* - | W */
#define ME_COUNTER_ENDDATA_A		0x001C	/* - | W */
#define ME_COUNTER_ENDDATA_B		0x001E	/* - | W */
#define ME_COUNTER_STARTDATA_A		0x0020	/* - | W */
#define ME_COUNTER_VALUE_A		0x0020	/* R | - */
#define ME_COUNTER_STARTDATA_B		0x0022	/* - | W */
#define ME_COUNTER_VALUE_B		0x0022	/* R | - */

/* Function prototypes */
static int me_attach(struct comedi_device *dev, struct comedi_devconfig *it);
static int me_detach(struct comedi_device *dev);

static const struct comedi_lrange me2000_ai_range = {
	8,
	{
	 BIP_RANGE(10),
	 BIP_RANGE(5),
	 BIP_RANGE(2.5),
	 BIP_RANGE(1.25),
	 UNI_RANGE(10),
	 UNI_RANGE(5),
	 UNI_RANGE(2.5),
	 UNI_RANGE(1.25)
	 }
};

static const struct comedi_lrange me2600_ai_range = {
	8,
	{
	 BIP_RANGE(10),
	 BIP_RANGE(5),
	 BIP_RANGE(2.5),
	 BIP_RANGE(1.25),
	 UNI_RANGE(10),
	 UNI_RANGE(5),
	 UNI_RANGE(2.5),
	 UNI_RANGE(1.25)
	 }
};

static const struct comedi_lrange me2600_ao_range = {
	3,
	{
	 BIP_RANGE(10),
	 BIP_RANGE(5),
	 UNI_RANGE(10)
	 }
};

static DEFINE_PCI_DEVICE_TABLE(me_pci_table) = {
	{ PCI_DEVICE(PCI_VENDOR_ID_MEILHAUS, ME2600_DEVICE_ID) },
	{ PCI_DEVICE(PCI_VENDOR_ID_MEILHAUS, ME2000_DEVICE_ID) },
	{0}
};

MODULE_DEVICE_TABLE(pci, me_pci_table);

/* Board specification structure */
struct me_board {
	const char *name;	/* driver name */
	int device_id;
	int ao_channel_nbr;	/* DA config */
	int ao_resolution;
	int ao_resolution_mask;
	const struct comedi_lrange *ao_range_list;
	int ai_channel_nbr;	/* AD config */
	int ai_resolution;
	int ai_resolution_mask;
	const struct comedi_lrange *ai_range_list;
	int dio_channel_nbr;	/* DIO config */
};

static const struct me_board me_boards[] = {
	{
	 /* -- ME-2600i -- */
	 .name = ME_DRIVER_NAME,
	 .device_id = ME2600_DEVICE_ID,
	 /* Analog Output */
	 .ao_channel_nbr = 4,
	 .ao_resolution = 12,
	 .ao_resolution_mask = 0x0fff,
	 .ao_range_list = &me2600_ao_range,
	 .ai_channel_nbr = 16,
	 /* Analog Input */
	 .ai_resolution = 12,
	 .ai_resolution_mask = 0x0fff,
	 .ai_range_list = &me2600_ai_range,
	 .dio_channel_nbr = 32,
	 },
	{
	 /* -- ME-2000i -- */
	 .name = ME_DRIVER_NAME,
	 .device_id = ME2000_DEVICE_ID,
	 /* Analog Output */
	 .ao_channel_nbr = 0,
	 .ao_resolution = 0,
	 .ao_resolution_mask = 0,
	 .ao_range_list = NULL,
	 .ai_channel_nbr = 16,
	 /* Analog Input */
	 .ai_resolution = 12,
	 .ai_resolution_mask = 0x0fff,
	 .ai_range_list = &me2000_ai_range,
	 .dio_channel_nbr = 32,
	 }
};

#define me_board_nbr (sizeof(me_boards)/sizeof(struct me_board))

static struct comedi_driver me_driver = {
	.driver_name = ME_DRIVER_NAME,
	.module = THIS_MODULE,
	.attach = me_attach,
	.detach = me_detach,
};

static int __devinit me_driver_pci_probe(struct pci_dev *dev,
					 const struct pci_device_id *ent)
{
	return comedi_pci_auto_config(dev, me_driver.driver_name);
}

static void __devexit me_driver_pci_remove(struct pci_dev *dev)
{
	comedi_pci_auto_unconfig(dev);
}

static struct pci_driver me_driver_pci_driver = {
	.id_table = me_pci_table,
	.probe = &me_driver_pci_probe,
	.remove = __devexit_p(&me_driver_pci_remove)
};

static int __init me_driver_init_module(void)
{
	int retval;

	retval = comedi_driver_register(&me_driver);
	if (retval < 0)
		return retval;

	me_driver_pci_driver.name = (char *)me_driver.driver_name;
	return pci_register_driver(&me_driver_pci_driver);
}

static void __exit me_driver_cleanup_module(void)
{
	pci_unregister_driver(&me_driver_pci_driver);
	comedi_driver_unregister(&me_driver);
}

module_init(me_driver_init_module);
module_exit(me_driver_cleanup_module);

/* Private data structure */
struct me_private_data {
	struct pci_dev *pci_device;
	void __iomem *plx_regbase;	/* PLX configuration base address */
	void __iomem *me_regbase;	/* Base address of the Meilhaus card */
	unsigned long plx_regbase_size;	/* Size of PLX configuration space */
	unsigned long me_regbase_size;	/* Size of Meilhaus space */

	unsigned short control_1;	/* Mirror of CONTROL_1 register */
	unsigned short control_2;	/* Mirror of CONTROL_2 register */
	unsigned short dac_control;	/* Mirror of the DAC_CONTROL register */
	int ao_readback[4];	/* Mirror of analog output data */
};

#define dev_private ((struct me_private_data *)dev->private)

/*
 * ------------------------------------------------------------------
 *
 * Helpful functions
 *
 * ------------------------------------------------------------------
 */
static inline void sleep(unsigned sec)
{
	current->state = TASK_INTERRUPTIBLE;
	schedule_timeout(sec * HZ);
}

/*
 * ------------------------------------------------------------------
 *
 * DIGITAL INPUT/OUTPUT SECTION
 *
 * ------------------------------------------------------------------
 */
static int me_dio_insn_config(struct comedi_device *dev,
			      struct comedi_subdevice *s,
			      struct comedi_insn *insn, unsigned int *data)
{
	int bits;
	int mask = 1 << CR_CHAN(insn->chanspec);

	/* calculate port */
	if (mask & 0x0000ffff) {	/* Port A in use */
		bits = 0x0000ffff;

		/* Enable Port A */
		dev_private->control_2 |= ENABLE_PORT_A;
		writew(dev_private->control_2,
		       dev_private->me_regbase + ME_CONTROL_2);
	} else {		/* Port B in use */

		bits = 0xffff0000;

		/* Enable Port B */
		dev_private->control_2 |= ENABLE_PORT_B;
		writew(dev_private->control_2,
		       dev_private->me_regbase + ME_CONTROL_2);
	}

	if (data[0]) {
		/* Config port as output */
		s->io_bits |= bits;
	} else {
		/* Config port as input */
		s->io_bits &= ~bits;
	}

	return 1;
}

/* Digital instant input/outputs */
static int me_dio_insn_bits(struct comedi_device *dev,
			    struct comedi_subdevice *s,
			    struct comedi_insn *insn, unsigned int *data)
{
	unsigned int mask = data[0];
	s->state &= ~mask;
	s->state |= (mask & data[1]);

	mask &= s->io_bits;
	if (mask & 0x0000ffff) {	/* Port A */
		writew((s->state & 0xffff),
		       dev_private->me_regbase + ME_DIO_PORT_A);
	} else {
		data[1] &= ~0x0000ffff;
		data[1] |= readw(dev_private->me_regbase + ME_DIO_PORT_A);
	}

	if (mask & 0xffff0000) {	/* Port B */
		writew(((s->state >> 16) & 0xffff),
		       dev_private->me_regbase + ME_DIO_PORT_B);
	} else {
		data[1] &= ~0xffff0000;
		data[1] |= readw(dev_private->me_regbase + ME_DIO_PORT_B) << 16;
	}

	return 2;
}

/*
 * ------------------------------------------------------------------
 *
 * ANALOG INPUT SECTION
 *
 * ------------------------------------------------------------------
 */

/* Analog instant input */
static int me_ai_insn_read(struct comedi_device *dev,
			   struct comedi_subdevice *subdevice,
			   struct comedi_insn *insn, unsigned int *data)
{
	unsigned short value;
	int chan = CR_CHAN((&insn->chanspec)[0]);
	int rang = CR_RANGE((&insn->chanspec)[0]);
	int aref = CR_AREF((&insn->chanspec)[0]);
	int i;

	/* stop any running conversion */
	dev_private->control_1 &= 0xFFFC;
	writew(dev_private->control_1, dev_private->me_regbase + ME_CONTROL_1);

	/* clear chanlist and ad fifo */
	dev_private->control_2 &= ~(ENABLE_ADFIFO | ENABLE_CHANLIST);
	writew(dev_private->control_2, dev_private->me_regbase + ME_CONTROL_2);

	/* reset any pending interrupt */
	writew(0x00, dev_private->me_regbase + ME_RESET_INTERRUPT);

	/* enable the chanlist and ADC fifo */
	dev_private->control_2 |= (ENABLE_ADFIFO | ENABLE_CHANLIST);
	writew(dev_private->control_2, dev_private->me_regbase + ME_CONTROL_2);

	/* write to channel list fifo */
	/* b3:b0 are the channel number */
	value = chan & 0x0f;
	/* b5:b4 are the channel gain */
	value |= (rang & 0x03) << 4;
	/* b6 channel polarity */
	value |= (rang & 0x04) << 4;
	/* b7 single or differential */
	value |= ((aref & AREF_DIFF) ? 0x80 : 0);
	writew(value & 0xff, dev_private->me_regbase + ME_CHANNEL_LIST);

	/* set ADC mode to software trigger */
	dev_private->control_1 |= SOFTWARE_TRIGGERED_ADC;
	writew(dev_private->control_1, dev_private->me_regbase + ME_CONTROL_1);

	/* start conversion by reading from ADC_START */
	readw(dev_private->me_regbase + ME_ADC_START);

	/* wait for ADC fifo not empty flag */
	for (i = 100000; i > 0; i--)
		if (!(readw(dev_private->me_regbase + ME_STATUS) & 0x0004))
			break;

	/* get value from ADC fifo */
	if (i) {
		data[0] =
		    (readw(dev_private->me_regbase +
			   ME_READ_AD_FIFO) ^ 0x800) & 0x0FFF;
	} else {
		printk(KERN_ERR "comedi%d: Cannot get single value\n",
		       dev->minor);
		return -EIO;
	}

	/* stop any running conversion */
	dev_private->control_1 &= 0xFFFC;
	writew(dev_private->control_1, dev_private->me_regbase + ME_CONTROL_1);

	return 1;
}

/*
 * ------------------------------------------------------------------
 *
 * HARDWARE TRIGGERED ANALOG INPUT SECTION
 *
 * ------------------------------------------------------------------
 */

/* Cancel analog input autoscan */
static int me_ai_cancel(struct comedi_device *dev, struct comedi_subdevice *s)
{
	/* disable interrupts */

	/* stop any running conversion */
	dev_private->control_1 &= 0xFFFC;
	writew(dev_private->control_1, dev_private->me_regbase + ME_CONTROL_1);

	return 0;
}

/* Test analog input command */
static int me_ai_do_cmd_test(struct comedi_device *dev,
			     struct comedi_subdevice *s, struct comedi_cmd *cmd)
{
	return 0;
}

/* Analog input command */
static int me_ai_do_cmd(struct comedi_device *dev,
			struct comedi_subdevice *subdevice)
{
	return 0;
}

/*
 * ------------------------------------------------------------------
 *
 * ANALOG OUTPUT SECTION
 *
 * ------------------------------------------------------------------
 */

/* Analog instant output */
static int me_ao_insn_write(struct comedi_device *dev,
			    struct comedi_subdevice *s,
			    struct comedi_insn *insn, unsigned int *data)
{
	int chan;
	int rang;
	int i;

	/* Enable all DAC */
	dev_private->control_2 |= ENABLE_DAC;
	writew(dev_private->control_2, dev_private->me_regbase + ME_CONTROL_2);

	/* and set DAC to "buffered" mode */
	dev_private->control_2 |= BUFFERED_DAC;
	writew(dev_private->control_2, dev_private->me_regbase + ME_CONTROL_2);

	/* Set dac-control register */
	for (i = 0; i < insn->n; i++) {
		chan = CR_CHAN((&insn->chanspec)[i]);
		rang = CR_RANGE((&insn->chanspec)[i]);

		/* clear bits for this channel */
		dev_private->dac_control &= ~(0x0880 >> chan);
		if (rang == 0)
			dev_private->dac_control |=
			    ((DAC_BIPOLAR_A | DAC_GAIN_1_A) >> chan);
		else if (rang == 1)
			dev_private->dac_control |=
			    ((DAC_BIPOLAR_A | DAC_GAIN_0_A) >> chan);
	}
	writew(dev_private->dac_control,
	       dev_private->me_regbase + ME_DAC_CONTROL);

	/* Update dac-control register */
	readw(dev_private->me_regbase + ME_DAC_CONTROL_UPDATE);

	/* Set data register */
	for (i = 0; i < insn->n; i++) {
		chan = CR_CHAN((&insn->chanspec)[i]);
		writew((data[0] & s->maxdata),
		       dev_private->me_regbase + ME_DAC_DATA_A + (chan << 1));
		dev_private->ao_readback[chan] = (data[0] & s->maxdata);
	}

	/* Update dac with data registers */
	readw(dev_private->me_regbase + ME_DAC_UPDATE);

	return i;
}

/* Analog output readback */
static int me_ao_insn_read(struct comedi_device *dev,
			   struct comedi_subdevice *s, struct comedi_insn *insn,
			   unsigned int *data)
{
	int i;

	for (i = 0; i < insn->n; i++) {
		data[i] =
		    dev_private->ao_readback[CR_CHAN((&insn->chanspec)[i])];
	}

	return 1;
}

/*
 * ------------------------------------------------------------------
 *
 * INITIALISATION SECTION
 *
 * ------------------------------------------------------------------
 */

/* Xilinx firmware download for card: ME-2600i */
static int me2600_xilinx_download(struct comedi_device *dev,
				  unsigned char *me2600_firmware,
				  unsigned int length)
{
	unsigned int value;
	unsigned int file_length;
	unsigned int i;

	/* disable irq's on PLX */
	writel(0x00, dev_private->plx_regbase + PLX_INTCSR);

	/* First, make a dummy read to reset xilinx */
	value = readw(dev_private->me_regbase + XILINX_DOWNLOAD_RESET);

	/* Wait until reset is over */
	sleep(1);

	/* Write a dummy value to Xilinx */
	writeb(0x00, dev_private->me_regbase + 0x0);
	sleep(1);

	/*
	 * Format of the firmware
	 * Build longs from the byte-wise coded header
	 * Byte 1-3:   length of the array
	 * Byte 4-7:   version
	 * Byte 8-11:  date
	 * Byte 12-15: reserved
	 */
	if (length < 16)
		return -EINVAL;
	file_length = (((unsigned int)me2600_firmware[0] & 0xff) << 24) +
	    (((unsigned int)me2600_firmware[1] & 0xff) << 16) +
	    (((unsigned int)me2600_firmware[2] & 0xff) << 8) +
	    ((unsigned int)me2600_firmware[3] & 0xff);

	/*
	 * Loop for writing firmware byte by byte to xilinx
	 * Firmware data start at offfset 16
	 */
	for (i = 0; i < file_length; i++)
		writeb((me2600_firmware[16 + i] & 0xff),
		       dev_private->me_regbase + 0x0);

	/* Write 5 dummy values to xilinx */
	for (i = 0; i < 5; i++)
		writeb(0x00, dev_private->me_regbase + 0x0);

	/* Test if there was an error during download -> INTB was thrown */
	value = readl(dev_private->plx_regbase + PLX_INTCSR);
	if (value & 0x20) {
		/* Disable interrupt */
		writel(0x00, dev_private->plx_regbase + PLX_INTCSR);
		printk(KERN_ERR "comedi%d: Xilinx download failed\n",
		       dev->minor);
		return -EIO;
	}

	/* Wait until the Xilinx is ready for real work */
	sleep(1);

	/* Enable PLX-Interrupts */
	writel(0x43, dev_private->plx_regbase + PLX_INTCSR);

	return 0;
}

/* Reset device */
static int me_reset(struct comedi_device *dev)
{
	/* Reset board */
	writew(0x00, dev_private->me_regbase + ME_CONTROL_1);
	writew(0x00, dev_private->me_regbase + ME_CONTROL_2);
	writew(0x00, dev_private->me_regbase + ME_RESET_INTERRUPT);
	writew(0x00, dev_private->me_regbase + ME_DAC_CONTROL);

	/* Save values in the board context */
	dev_private->dac_control = 0;
	dev_private->control_1 = 0;
	dev_private->control_2 = 0;

	return 0;
}

/*
 * Attach
 *
 * - Register PCI device
 * - Declare device driver capability
 */
static int me_attach(struct comedi_device *dev, struct comedi_devconfig *it)
{
	struct pci_dev *pci_device = NULL;
	struct comedi_subdevice *subdevice;
	struct me_board *board;
	resource_size_t plx_regbase_tmp;
	unsigned long plx_regbase_size_tmp;
	resource_size_t me_regbase_tmp;
	unsigned long me_regbase_size_tmp;
	resource_size_t swap_regbase_tmp;
	unsigned long swap_regbase_size_tmp;
	resource_size_t regbase_tmp;
	int result, error, i;

	/* Allocate private memory */
	if (alloc_private(dev, sizeof(struct me_private_data)) < 0)
		return -ENOMEM;

	/* Probe the device to determine what device in the series it is. */
	for_each_pci_dev(pci_device) {
		if (pci_device->vendor == PCI_VENDOR_ID_MEILHAUS) {
			for (i = 0; i < me_board_nbr; i++) {
				if (me_boards[i].device_id ==
				    pci_device->device) {
					/*
					 * was a particular bus/slot requested?
					 */
					if ((it->options[0] != 0)
					    || (it->options[1] != 0)) {
						/*
						 * are we on the wrong bus/slot?
						 */
						if (pci_device->bus->number !=
						    it->options[0]
						    ||
						    PCI_SLOT(pci_device->devfn)
						    != it->options[1]) {
							continue;
						}
					}

					dev->board_ptr = me_boards + i;
					board =
					    (struct me_board *)dev->board_ptr;
					dev_private->pci_device = pci_device;
					goto found;
				}
			}
		}
	}

	printk(KERN_ERR
	       "comedi%d: no supported board found! (req. bus/slot : %d/%d)\n",
	       dev->minor, it->options[0], it->options[1]);
	return -EIO;

found:
	printk(KERN_INFO "comedi%d: found %s at PCI bus %d, slot %d\n",
	       dev->minor, me_boards[i].name,
	       pci_device->bus->number, PCI_SLOT(pci_device->devfn));

	/* Enable PCI device and request PCI regions */
	if (comedi_pci_enable(pci_device, ME_DRIVER_NAME) < 0) {
		printk(KERN_ERR "comedi%d: Failed to enable PCI device and "
		       "request regions\n", dev->minor);
		return -EIO;
	}

	/* Set data in device structure */
	dev->board_name = board->name;

	/* Read PLX register base address [PCI_BASE_ADDRESS #0]. */
	plx_regbase_tmp = pci_resource_start(pci_device, 0);
	plx_regbase_size_tmp = pci_resource_len(pci_device, 0);
	dev_private->plx_regbase =
	    ioremap(plx_regbase_tmp, plx_regbase_size_tmp);
	dev_private->plx_regbase_size = plx_regbase_size_tmp;
	if (!dev_private->plx_regbase) {
		printk("comedi%d: Failed to remap I/O memory\n", dev->minor);
		return -ENOMEM;
	}

	/* Read Swap base address [PCI_BASE_ADDRESS #5]. */

	swap_regbase_tmp = pci_resource_start(pci_device, 5);
	swap_regbase_size_tmp = pci_resource_len(pci_device, 5);

	if (!swap_regbase_tmp)
		printk(KERN_ERR "comedi%d: Swap not present\n", dev->minor);

	/*---------------------------------------------- Workaround start ---*/
	if (plx_regbase_tmp & 0x0080) {
		printk(KERN_ERR "comedi%d: PLX-Bug detected\n", dev->minor);

		if (swap_regbase_tmp) {
			regbase_tmp = plx_regbase_tmp;
			plx_regbase_tmp = swap_regbase_tmp;
			swap_regbase_tmp = regbase_tmp;

			result = pci_write_config_dword(pci_device,
							PCI_BASE_ADDRESS_0,
							plx_regbase_tmp);
			if (result != PCIBIOS_SUCCESSFUL)
				return -EIO;

			result = pci_write_config_dword(pci_device,
							PCI_BASE_ADDRESS_5,
							swap_regbase_tmp);
			if (result != PCIBIOS_SUCCESSFUL)
				return -EIO;
		} else {
			plx_regbase_tmp -= 0x80;
			result = pci_write_config_dword(pci_device,
							PCI_BASE_ADDRESS_0,
							plx_regbase_tmp);
			if (result != PCIBIOS_SUCCESSFUL)
				return -EIO;
		}
	}
	/*--------------------------------------------- Workaround end -----*/

	/* Read Meilhaus register base address [PCI_BASE_ADDRESS #2]. */

	me_regbase_tmp = pci_resource_start(pci_device, 2);
	me_regbase_size_tmp = pci_resource_len(pci_device, 2);
	dev_private->me_regbase_size = me_regbase_size_tmp;
	dev_private->me_regbase = ioremap(me_regbase_tmp, me_regbase_size_tmp);
	if (!dev_private->me_regbase) {
		printk(KERN_ERR "comedi%d: Failed to remap I/O memory\n",
		       dev->minor);
		return -ENOMEM;
	}
	/* Download firmware and reset card */
	if (board->device_id == ME2600_DEVICE_ID) {
		unsigned char *aux_data;
		int aux_len;

		aux_data = comedi_aux_data(it->options, 0);
		aux_len = it->options[COMEDI_DEVCONF_AUX_DATA_LENGTH];

		if (!aux_data || aux_len < 1) {
			comedi_error(dev, "You must provide me2600 firmware "
				     "using the --init-data option of "
				     "comedi_config");
			return -EINVAL;
		}
		me2600_xilinx_download(dev, aux_data, aux_len);
	}

	me_reset(dev);

	/* device driver capabilities */
	error = alloc_subdevices(dev, 3);
	if (error < 0)
		return error;

	subdevice = dev->subdevices + 0;
	subdevice->type = COMEDI_SUBD_AI;
	subdevice->subdev_flags = SDF_READABLE | SDF_COMMON | SDF_CMD_READ;
	subdevice->n_chan = board->ai_channel_nbr;
	subdevice->maxdata = board->ai_resolution_mask;
	subdevice->len_chanlist = board->ai_channel_nbr;
	subdevice->range_table = board->ai_range_list;
	subdevice->cancel = me_ai_cancel;
	subdevice->insn_read = me_ai_insn_read;
	subdevice->do_cmdtest = me_ai_do_cmd_test;
	subdevice->do_cmd = me_ai_do_cmd;

	subdevice = dev->subdevices + 1;
	subdevice->type = COMEDI_SUBD_AO;
	subdevice->subdev_flags = SDF_WRITEABLE | SDF_COMMON;
	subdevice->n_chan = board->ao_channel_nbr;
	subdevice->maxdata = board->ao_resolution_mask;
	subdevice->len_chanlist = board->ao_channel_nbr;
	subdevice->range_table = board->ao_range_list;
	subdevice->insn_read = me_ao_insn_read;
	subdevice->insn_write = me_ao_insn_write;

	subdevice = dev->subdevices + 2;
	subdevice->type = COMEDI_SUBD_DIO;
	subdevice->subdev_flags = SDF_READABLE | SDF_WRITEABLE;
	subdevice->n_chan = board->dio_channel_nbr;
	subdevice->maxdata = 1;
	subdevice->len_chanlist = board->dio_channel_nbr;
	subdevice->range_table = &range_digital;
	subdevice->insn_bits = me_dio_insn_bits;
	subdevice->insn_config = me_dio_insn_config;
	subdevice->io_bits = 0;

	printk(KERN_INFO "comedi%d: " ME_DRIVER_NAME " attached.\n",
	       dev->minor);
	return 0;
}

/* Detach */
static int me_detach(struct comedi_device *dev)
{
	if (dev_private) {
		if (dev_private->me_regbase) {
			me_reset(dev);
			iounmap(dev_private->me_regbase);
		}
		if (dev_private->plx_regbase)
			iounmap(dev_private->plx_regbase);
		if (dev_private->pci_device) {
			if (dev_private->plx_regbase_size)
				comedi_pci_disable(dev_private->pci_device);

			pci_dev_put(dev_private->pci_device);
		}
	}
	return 0;
}

MODULE_AUTHOR("Comedi http://www.comedi.org");
MODULE_DESCRIPTION("Comedi low-level driver");
MODULE_LICENSE("GPL");