drivers/staging/comedi/drivers/8255_pci.c - manifest_repos/salami - Git at Google

 /*
  * COMEDI driver for generic PCI based 8255 digital i/o boards
  * Copyright (C) 2012 H Hartley Sweeten <hsweeten@visionengravers.com>
  *
  * Based on the tested adl_pci7296 driver written by:
  *	Jon Grierson <jd@renko.co.uk>
  * and the experimental cb_pcidio driver written by:
  *	Yoshiya Matsuzaka
  *
  * 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: 8255_pci
 Description: Generic PCI based 8255 Digital I/O boards
 Devices: (ADLink) PCI-7224 [adl_pci-7224] - 24 channels
 	 (ADLink) PCI-7248 [adl_pci-7248] - 48 channels
 	 (ADLink) PCI-7296 [adl_pci-7296] - 96 channels
 	 (Measurement Computing) PCI-DIO24 [cb_pci-dio24] - 24 channels
 	 (Measurement Computing) PCI-DIO24H [cb_pci-dio24h] - 24 channels
 	 (Measurement Computing) PCI-DIO48H [cb_pci-dio48h] - 48 channels
 	 (Measurement Computing) PCI-DIO96H [cb_pci-dio96h] - 96 channels
 	 (National Instruments) PCI-DIO-96 [ni_pci-dio-96] - 96 channels
 	 (National Instruments) PCI-DIO-96B [ni_pci-dio-96b] - 96 channels
 	 (National Instruments) PXI-6508 [ni_pxi-6508] - 96 channels
 	 (National Instruments) PCI-6503 [ni_pci-6503] - 24 channels
 	 (National Instruments) PCI-6503B [ni_pci-6503b] - 24 channels
 	 (National Instruments) PCI-6503X [ni_pci-6503x] - 24 channels
 	 (National Instruments) PXI-6503 [ni_pxi-6503] - 24 channels
 Author: H Hartley Sweeten <hsweeten@visionengravers.com>
 Updated: Wed, 12 Sep 2012 11:52:01 -0700
 Status: untested

 Some of these boards also have an 8254 programmable timer/counter
 chip. This chip is not currently supported by this driver.

 Interrupt support for these boards is also not currently supported.

 Configuration Options: not applicable, uses PCI auto config
 */

 #include "../comedidev.h"

 #include "8255.h"

 /*
  * PCI Device ID's supported by this driver
  */
 #define PCI_DEVICE_ID_ADLINK_PCI7224	0x7224
 #define PCI_DEVICE_ID_ADLINK_PCI7248	0x7248
 #define PCI_DEVICE_ID_ADLINK_PCI7296	0x7296

 #define PCI_DEVICE_ID_CB_PCIDIO48H	0x000b
 #define PCI_DEVICE_ID_CB_PCIDIO24H	0x0014
 #define PCI_DEVICE_ID_CB_PCIDIO96H	0x0017
 #define PCI_DEVICE_ID_CB_PCIDIO24	0x0028

 #define PCI_DEVICE_ID_NI_PCIDIO96	0x0160
 #define PCI_DEVICE_ID_NI_PCI6503	0x0400
 #define PCI_DEVICE_ID_NI_PCI6503B	0x1250
 #define PCI_DEVICE_ID_NI_PXI6508	0x13c0
 #define PCI_DEVICE_ID_NI_PCIDIO96B	0x1630
 #define PCI_DEVICE_ID_NI_PCI6503X	0x17d0
 #define PCI_DEVICE_ID_NI_PXI_6503	0x1800

 struct pci_8255_boardinfo {
 	const char *name;
 	unsigned short vendor;
 	unsigned short device;
 	int dio_badr;
 	int is_mmio;
 	int n_8255;
 };

 static const struct pci_8255_boardinfo pci_8255_boards[] = {
 	{
 		.name		= "adl_pci-7224",
 		.vendor		= PCI_VENDOR_ID_ADLINK,
 		.device		= PCI_DEVICE_ID_ADLINK_PCI7224,
 		.dio_badr	= 2,
 		.n_8255		= 1,
 	}, {
 		.name		= "adl_pci-7248",
 		.vendor		= PCI_VENDOR_ID_ADLINK,
 		.device		= PCI_DEVICE_ID_ADLINK_PCI7248,
 		.dio_badr	= 2,
 		.n_8255		= 2,
 	}, {
 		.name		= "adl_pci-7296",
 		.vendor		= PCI_VENDOR_ID_ADLINK,
 		.device		= PCI_DEVICE_ID_ADLINK_PCI7296,
 		.dio_badr	= 2,
 		.n_8255		= 4,
 	}, {
 		.name		= "cb_pci-dio24",
 		.vendor		= PCI_VENDOR_ID_CB,
 		.device		= PCI_DEVICE_ID_CB_PCIDIO24,
 		.dio_badr	= 2,
 		.n_8255		= 1,
 	}, {
 		.name		= "cb_pci-dio24h",
 		.vendor		= PCI_VENDOR_ID_CB,
 		.device		= PCI_DEVICE_ID_CB_PCIDIO24H,
 		.dio_badr	= 2,
 		.n_8255		= 1,
 	}, {
 		.name		= "cb_pci-dio48h",
 		.vendor		= PCI_VENDOR_ID_CB,
 		.device		= PCI_DEVICE_ID_CB_PCIDIO48H,
 		.dio_badr	= 1,
 		.n_8255		= 2,
 	}, {
 		.name		= "cb_pci-dio96h",
 		.vendor		= PCI_VENDOR_ID_CB,
 		.device		= PCI_DEVICE_ID_CB_PCIDIO96H,
 		.dio_badr	= 2,
 		.n_8255		= 4,
 	}, {
 		.name		= "ni_pci-dio-96",
 		.vendor		= PCI_VENDOR_ID_NI,
 		.device		= PCI_DEVICE_ID_NI_PCIDIO96,
 		.dio_badr	= 1,
 		.is_mmio	= 1,
 		.n_8255		= 4,
 	}, {
 		.name		= "ni_pci-dio-96b",
 		.vendor		= PCI_VENDOR_ID_NI,
 		.device		= PCI_DEVICE_ID_NI_PCIDIO96B,
 		.dio_badr	= 1,
 		.is_mmio	= 1,
 		.n_8255		= 4,
 	}, {
 		.name		= "ni_pxi-6508",
 		.vendor		= PCI_VENDOR_ID_NI,
 		.device		= PCI_DEVICE_ID_NI_PXI6508,
 		.dio_badr	= 1,
 		.is_mmio	= 1,
 		.n_8255		= 4,
 	}, {
 		.name		= "ni_pci-6503",
 		.vendor		= PCI_VENDOR_ID_NI,
 		.device		= PCI_DEVICE_ID_NI_PCI6503,
 		.dio_badr	= 1,
 		.is_mmio	= 1,
 		.n_8255		= 1,
 	}, {
 		.name		= "ni_pci-6503b",
 		.vendor		= PCI_VENDOR_ID_NI,
 		.device		= PCI_DEVICE_ID_NI_PCI6503B,
 		.dio_badr	= 1,
 		.is_mmio	= 1,
 		.n_8255		= 1,
 	}, {
 		.name		= "ni_pci-6503x",
 		.vendor		= PCI_VENDOR_ID_NI,
 		.device		= PCI_DEVICE_ID_NI_PCI6503X,
 		.dio_badr	= 1,
 		.is_mmio	= 1,
 		.n_8255		= 1,
 	}, {
 		.name		= "ni_pxi-6503",
 		.vendor		= PCI_VENDOR_ID_NI,
 		.device		= PCI_DEVICE_ID_NI_PXI_6503,
 		.dio_badr	= 1,
 		.is_mmio	= 1,
 		.n_8255		= 1,
 	},
 };

 struct pci_8255_private {
 	void __iomem *mmio_base;
 };

 static int pci_8255_mmio(int dir, int port, int data, unsigned long iobase)
 {
 	void __iomem *mmio_base = (void __iomem *)iobase;

 	if (dir) {
 		writeb(data, mmio_base + port);
 		return 0;
 	} else {
 		return readb(mmio_base  + port);
 	}
 }

 static const void *pci_8255_find_boardinfo(struct comedi_device *dev,
 					      struct pci_dev *pcidev)
 {
 	const struct pci_8255_boardinfo *board;
 	int i;

 	for (i = 0; i < ARRAY_SIZE(pci_8255_boards); i++) {
 		board = &pci_8255_boards[i];
 		if (pcidev->vendor == board->vendor &&
 		    pcidev->device == board->device)
 			return board;
 	}
 	return NULL;
 }

 static int pci_8255_auto_attach(struct comedi_device *dev,
 					  unsigned long context_unused)
 {
 	struct pci_dev *pcidev = comedi_to_pci_dev(dev);
 	const struct pci_8255_boardinfo *board;
 	struct pci_8255_private *devpriv;
 	struct comedi_subdevice *s;
 	resource_size_t iobase;
 	unsigned long len;
 	int ret;
 	int i;

 	board = pci_8255_find_boardinfo(dev, pcidev);
 	if (!board)
 		return -ENODEV;
 	dev->board_ptr = board;
 	dev->board_name = board->name;

 	devpriv = kzalloc(sizeof(*devpriv), GFP_KERNEL);
 	if (!devpriv)
 		return -ENOMEM;
 	dev->private = devpriv;

 	ret = comedi_pci_enable(pcidev, dev->board_name);
 	if (ret)
 		return ret;
 	iobase = pci_resource_start(pcidev, board->dio_badr);
 	len = pci_resource_len(pcidev, board->dio_badr);

 	if (board->is_mmio) {
 		devpriv->mmio_base = ioremap(iobase, len);
 		if (!devpriv->mmio_base)
 			return -ENOMEM;
 	}
 	dev->iobase = iobase;

 	/*
 	 * One, two, or four subdevices are setup by this driver depending
 	 * on the number of channels provided by the board. Each subdevice
 	 * has 24 channels supported by the 8255 module.
 	 */
 	ret = comedi_alloc_subdevices(dev, board->n_8255);
 	if (ret)
 		return ret;

 	for (i = 0; i < board->n_8255; i++) {
 		s = &dev->subdevices[i];
 		if (board->is_mmio) {
 			iobase = (unsigned long)(devpriv->mmio_base + (i * 4));
 			ret = subdev_8255_init(dev, s, pci_8255_mmio, iobase);
 		} else {
 			iobase = dev->iobase + (i * 4);
 			ret = subdev_8255_init(dev, s, NULL, iobase);
 		}
 		if (ret)
 			return ret;
 	}

 	dev_info(dev->class_dev, "%s attached (%d digital i/o channels)\n",
 		dev->board_name, board->n_8255 * 24);

 	return 0;
 }

 static void pci_8255_detach(struct comedi_device *dev)
 {
 	struct pci_dev *pcidev = comedi_to_pci_dev(dev);
 	const struct pci_8255_boardinfo *board = comedi_board(dev);
 	struct pci_8255_private *devpriv = dev->private;
 	struct comedi_subdevice *s;
 	int i;

 	if (!board || !devpriv)
 		return;
 	if (dev->subdevices) {
 		for (i = 0; i < board->n_8255; i++) {
 			s = &dev->subdevices[i];
 			subdev_8255_cleanup(dev, s);
 		}
 	}
 	if (pcidev) {
 		if (devpriv->mmio_base)
 			iounmap(devpriv->mmio_base);
 		if (dev->iobase)
 			comedi_pci_disable(pcidev);
 	}
 }

 static struct comedi_driver pci_8255_driver = {
 	.driver_name	= "8255_pci",
 	.module		= THIS_MODULE,
 	.auto_attach	= pci_8255_auto_attach,
 	.detach		= pci_8255_detach,
 };

 static int pci_8255_pci_probe(struct pci_dev *dev,
 					const struct pci_device_id *ent)
 {
 	return comedi_pci_auto_config(dev, &pci_8255_driver);
 }

 static void pci_8255_pci_remove(struct pci_dev *dev)
 {
 	comedi_pci_auto_unconfig(dev);
 }

 static DEFINE_PCI_DEVICE_TABLE(pci_8255_pci_table) = {
 	{ PCI_DEVICE(PCI_VENDOR_ID_ADLINK, PCI_DEVICE_ID_ADLINK_PCI7224) },
 	{ PCI_DEVICE(PCI_VENDOR_ID_ADLINK, PCI_DEVICE_ID_ADLINK_PCI7248) },
 	{ PCI_DEVICE(PCI_VENDOR_ID_ADLINK, PCI_DEVICE_ID_ADLINK_PCI7296) },
 	{ PCI_DEVICE(PCI_VENDOR_ID_CB, PCI_DEVICE_ID_CB_PCIDIO24) },
 	{ PCI_DEVICE(PCI_VENDOR_ID_CB, PCI_DEVICE_ID_CB_PCIDIO24H) },
 	{ PCI_DEVICE(PCI_VENDOR_ID_CB, PCI_DEVICE_ID_CB_PCIDIO48H) },
 	{ PCI_DEVICE(PCI_VENDOR_ID_CB, PCI_DEVICE_ID_CB_PCIDIO96H) },
 	{ PCI_DEVICE(PCI_VENDOR_ID_NI, PCI_DEVICE_ID_NI_PCIDIO96) },
 	{ PCI_DEVICE(PCI_VENDOR_ID_NI, PCI_DEVICE_ID_NI_PCIDIO96B) },
 	{ PCI_DEVICE(PCI_VENDOR_ID_NI, PCI_DEVICE_ID_NI_PXI6508) },
 	{ PCI_DEVICE(PCI_VENDOR_ID_NI, PCI_DEVICE_ID_NI_PCI6503) },
 	{ PCI_DEVICE(PCI_VENDOR_ID_NI, PCI_DEVICE_ID_NI_PCI6503B) },
 	{ PCI_DEVICE(PCI_VENDOR_ID_NI, PCI_DEVICE_ID_NI_PCI6503X) },
 	{ PCI_DEVICE(PCI_VENDOR_ID_NI, PCI_DEVICE_ID_NI_PXI_6503) },
 	{ 0 }
 };
 MODULE_DEVICE_TABLE(pci, pci_8255_pci_table);

 static struct pci_driver pci_8255_pci_driver = {
 	.name		= "8255_pci",
 	.id_table	= pci_8255_pci_table,
 	.probe		= pci_8255_pci_probe,
 	.remove		= pci_8255_pci_remove,
 };
 module_comedi_pci_driver(pci_8255_driver, pci_8255_pci_driver);

 MODULE_DESCRIPTION("COMEDI - Generic PCI based 8255 Digital I/O boards");
 MODULE_AUTHOR("Comedi http://www.comedi.org");
 MODULE_LICENSE("GPL");
	/*
	* COMEDI driver for generic PCI based 8255 digital i/o boards
	* Copyright (C) 2012 H Hartley Sweeten <hsweeten@visionengravers.com>
	*
	* Based on the tested adl_pci7296 driver written by:
	* Jon Grierson <jd@renko.co.uk>
	* and the experimental cb_pcidio driver written by:
	* Yoshiya Matsuzaka
	*
	* 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: 8255_pci
	Description: Generic PCI based 8255 Digital I/O boards
	Devices: (ADLink) PCI-7224 [adl_pci-7224] - 24 channels
	(ADLink) PCI-7248 [adl_pci-7248] - 48 channels
	(ADLink) PCI-7296 [adl_pci-7296] - 96 channels
	(Measurement Computing) PCI-DIO24 [cb_pci-dio24] - 24 channels
	(Measurement Computing) PCI-DIO24H [cb_pci-dio24h] - 24 channels
	(Measurement Computing) PCI-DIO48H [cb_pci-dio48h] - 48 channels
	(Measurement Computing) PCI-DIO96H [cb_pci-dio96h] - 96 channels
	(National Instruments) PCI-DIO-96 [ni_pci-dio-96] - 96 channels
	(National Instruments) PCI-DIO-96B [ni_pci-dio-96b] - 96 channels
	(National Instruments) PXI-6508 [ni_pxi-6508] - 96 channels
	(National Instruments) PCI-6503 [ni_pci-6503] - 24 channels
	(National Instruments) PCI-6503B [ni_pci-6503b] - 24 channels
	(National Instruments) PCI-6503X [ni_pci-6503x] - 24 channels
	(National Instruments) PXI-6503 [ni_pxi-6503] - 24 channels
	Author: H Hartley Sweeten <hsweeten@visionengravers.com>
	Updated: Wed, 12 Sep 2012 11:52:01 -0700
	Status: untested

	Some of these boards also have an 8254 programmable timer/counter
	chip. This chip is not currently supported by this driver.

	Interrupt support for these boards is also not currently supported.

	Configuration Options: not applicable, uses PCI auto config
	*/

	#include "../comedidev.h"

	#include "8255.h"

	/*
	* PCI Device ID's supported by this driver
	*/
	#define PCI_DEVICE_ID_ADLINK_PCI7224 0x7224
	#define PCI_DEVICE_ID_ADLINK_PCI7248 0x7248
	#define PCI_DEVICE_ID_ADLINK_PCI7296 0x7296

	#define PCI_DEVICE_ID_CB_PCIDIO48H 0x000b
	#define PCI_DEVICE_ID_CB_PCIDIO24H 0x0014
	#define PCI_DEVICE_ID_CB_PCIDIO96H 0x0017
	#define PCI_DEVICE_ID_CB_PCIDIO24 0x0028

	#define PCI_DEVICE_ID_NI_PCIDIO96 0x0160
	#define PCI_DEVICE_ID_NI_PCI6503 0x0400
	#define PCI_DEVICE_ID_NI_PCI6503B 0x1250
	#define PCI_DEVICE_ID_NI_PXI6508 0x13c0
	#define PCI_DEVICE_ID_NI_PCIDIO96B 0x1630
	#define PCI_DEVICE_ID_NI_PCI6503X 0x17d0
	#define PCI_DEVICE_ID_NI_PXI_6503 0x1800

	struct pci_8255_boardinfo {
	const char *name;
	unsigned short vendor;
	unsigned short device;
	int dio_badr;
	int is_mmio;
	int n_8255;
	};

	static const struct pci_8255_boardinfo pci_8255_boards[] = {
	{
	.name = "adl_pci-7224",
	.vendor = PCI_VENDOR_ID_ADLINK,
	.device = PCI_DEVICE_ID_ADLINK_PCI7224,
	.dio_badr = 2,
	.n_8255 = 1,
	}, {
	.name = "adl_pci-7248",
	.vendor = PCI_VENDOR_ID_ADLINK,
	.device = PCI_DEVICE_ID_ADLINK_PCI7248,
	.dio_badr = 2,
	.n_8255 = 2,
	}, {
	.name = "adl_pci-7296",
	.vendor = PCI_VENDOR_ID_ADLINK,
	.device = PCI_DEVICE_ID_ADLINK_PCI7296,
	.dio_badr = 2,
	.n_8255 = 4,
	}, {
	.name = "cb_pci-dio24",
	.vendor = PCI_VENDOR_ID_CB,
	.device = PCI_DEVICE_ID_CB_PCIDIO24,
	.dio_badr = 2,
	.n_8255 = 1,
	}, {
	.name = "cb_pci-dio24h",
	.vendor = PCI_VENDOR_ID_CB,
	.device = PCI_DEVICE_ID_CB_PCIDIO24H,
	.dio_badr = 2,
	.n_8255 = 1,
	}, {
	.name = "cb_pci-dio48h",
	.vendor = PCI_VENDOR_ID_CB,
	.device = PCI_DEVICE_ID_CB_PCIDIO48H,
	.dio_badr = 1,
	.n_8255 = 2,
	}, {
	.name = "cb_pci-dio96h",
	.vendor = PCI_VENDOR_ID_CB,
	.device = PCI_DEVICE_ID_CB_PCIDIO96H,
	.dio_badr = 2,
	.n_8255 = 4,
	}, {
	.name = "ni_pci-dio-96",
	.vendor = PCI_VENDOR_ID_NI,
	.device = PCI_DEVICE_ID_NI_PCIDIO96,
	.dio_badr = 1,
	.is_mmio = 1,
	.n_8255 = 4,
	}, {
	.name = "ni_pci-dio-96b",
	.vendor = PCI_VENDOR_ID_NI,
	.device = PCI_DEVICE_ID_NI_PCIDIO96B,
	.dio_badr = 1,
	.is_mmio = 1,
	.n_8255 = 4,
	}, {
	.name = "ni_pxi-6508",
	.vendor = PCI_VENDOR_ID_NI,
	.device = PCI_DEVICE_ID_NI_PXI6508,
	.dio_badr = 1,
	.is_mmio = 1,
	.n_8255 = 4,
	}, {
	.name = "ni_pci-6503",
	.vendor = PCI_VENDOR_ID_NI,
	.device = PCI_DEVICE_ID_NI_PCI6503,
	.dio_badr = 1,
	.is_mmio = 1,
	.n_8255 = 1,
	}, {
	.name = "ni_pci-6503b",
	.vendor = PCI_VENDOR_ID_NI,
	.device = PCI_DEVICE_ID_NI_PCI6503B,
	.dio_badr = 1,
	.is_mmio = 1,
	.n_8255 = 1,
	}, {
	.name = "ni_pci-6503x",
	.vendor = PCI_VENDOR_ID_NI,
	.device = PCI_DEVICE_ID_NI_PCI6503X,
	.dio_badr = 1,
	.is_mmio = 1,
	.n_8255 = 1,
	}, {
	.name = "ni_pxi-6503",
	.vendor = PCI_VENDOR_ID_NI,
	.device = PCI_DEVICE_ID_NI_PXI_6503,
	.dio_badr = 1,
	.is_mmio = 1,
	.n_8255 = 1,
	},
	};

	struct pci_8255_private {
	void __iomem *mmio_base;
	};

	static int pci_8255_mmio(int dir, int port, int data, unsigned long iobase)
	{
	void __iomem mmio_base = (void __iomem )iobase;

	if (dir) {
	writeb(data, mmio_base + port);
	return 0;
	} else {
	return readb(mmio_base + port);
	}
	}

	static const void pci_8255_find_boardinfo(struct comedi_device dev,
	struct pci_dev *pcidev)
	{
	const struct pci_8255_boardinfo *board;
	int i;

	for (i = 0; i < ARRAY_SIZE(pci_8255_boards); i++) {
	board = &pci_8255_boards[i];
	if (pcidev->vendor == board->vendor &&
	pcidev->device == board->device)
	return board;
	}
	return NULL;
	}

	static int pci_8255_auto_attach(struct comedi_device *dev,
	unsigned long context_unused)
	{
	struct pci_dev *pcidev = comedi_to_pci_dev(dev);
	const struct pci_8255_boardinfo *board;
	struct pci_8255_private *devpriv;
	struct comedi_subdevice *s;
	resource_size_t iobase;
	unsigned long len;
	int ret;
	int i;

	board = pci_8255_find_boardinfo(dev, pcidev);
	if (!board)
	return -ENODEV;
	dev->board_ptr = board;
	dev->board_name = board->name;

	devpriv = kzalloc(sizeof(*devpriv), GFP_KERNEL);
	if (!devpriv)
	return -ENOMEM;
	dev->private = devpriv;

	ret = comedi_pci_enable(pcidev, dev->board_name);
	if (ret)
	return ret;
	iobase = pci_resource_start(pcidev, board->dio_badr);
	len = pci_resource_len(pcidev, board->dio_badr);

	if (board->is_mmio) {
	devpriv->mmio_base = ioremap(iobase, len);
	if (!devpriv->mmio_base)
	return -ENOMEM;
	}
	dev->iobase = iobase;

	/*
	* One, two, or four subdevices are setup by this driver depending
	* on the number of channels provided by the board. Each subdevice
	* has 24 channels supported by the 8255 module.
	*/
	ret = comedi_alloc_subdevices(dev, board->n_8255);
	if (ret)
	return ret;

	for (i = 0; i < board->n_8255; i++) {
	s = &dev->subdevices[i];
	if (board->is_mmio) {
	iobase = (unsigned long)(devpriv->mmio_base + (i * 4));
	ret = subdev_8255_init(dev, s, pci_8255_mmio, iobase);
	} else {
	iobase = dev->iobase + (i * 4);
	ret = subdev_8255_init(dev, s, NULL, iobase);
	}
	if (ret)
	return ret;
	}

	dev_info(dev->class_dev, "%s attached (%d digital i/o channels)\n",
	dev->board_name, board->n_8255 * 24);

	return 0;
	}

	static void pci_8255_detach(struct comedi_device *dev)
	{
	struct pci_dev *pcidev = comedi_to_pci_dev(dev);
	const struct pci_8255_boardinfo *board = comedi_board(dev);
	struct pci_8255_private *devpriv = dev->private;
	struct comedi_subdevice *s;
	int i;

	if (!board \|\| !devpriv)
	return;
	if (dev->subdevices) {
	for (i = 0; i < board->n_8255; i++) {
	s = &dev->subdevices[i];
	subdev_8255_cleanup(dev, s);
	}
	}
	if (pcidev) {
	if (devpriv->mmio_base)
	iounmap(devpriv->mmio_base);
	if (dev->iobase)
	comedi_pci_disable(pcidev);
	}
	}

	static struct comedi_driver pci_8255_driver = {
	.driver_name = "8255_pci",
	.module = THIS_MODULE,
	.auto_attach = pci_8255_auto_attach,
	.detach = pci_8255_detach,
	};

	static int pci_8255_pci_probe(struct pci_dev *dev,
	const struct pci_device_id *ent)
	{
	return comedi_pci_auto_config(dev, &pci_8255_driver);
	}

	static void pci_8255_pci_remove(struct pci_dev *dev)
	{
	comedi_pci_auto_unconfig(dev);
	}

	static DEFINE_PCI_DEVICE_TABLE(pci_8255_pci_table) = {
	{ PCI_DEVICE(PCI_VENDOR_ID_ADLINK, PCI_DEVICE_ID_ADLINK_PCI7224) },
	{ PCI_DEVICE(PCI_VENDOR_ID_ADLINK, PCI_DEVICE_ID_ADLINK_PCI7248) },
	{ PCI_DEVICE(PCI_VENDOR_ID_ADLINK, PCI_DEVICE_ID_ADLINK_PCI7296) },
	{ PCI_DEVICE(PCI_VENDOR_ID_CB, PCI_DEVICE_ID_CB_PCIDIO24) },
	{ PCI_DEVICE(PCI_VENDOR_ID_CB, PCI_DEVICE_ID_CB_PCIDIO24H) },
	{ PCI_DEVICE(PCI_VENDOR_ID_CB, PCI_DEVICE_ID_CB_PCIDIO48H) },
	{ PCI_DEVICE(PCI_VENDOR_ID_CB, PCI_DEVICE_ID_CB_PCIDIO96H) },
	{ PCI_DEVICE(PCI_VENDOR_ID_NI, PCI_DEVICE_ID_NI_PCIDIO96) },
	{ PCI_DEVICE(PCI_VENDOR_ID_NI, PCI_DEVICE_ID_NI_PCIDIO96B) },
	{ PCI_DEVICE(PCI_VENDOR_ID_NI, PCI_DEVICE_ID_NI_PXI6508) },
	{ PCI_DEVICE(PCI_VENDOR_ID_NI, PCI_DEVICE_ID_NI_PCI6503) },
	{ PCI_DEVICE(PCI_VENDOR_ID_NI, PCI_DEVICE_ID_NI_PCI6503B) },
	{ PCI_DEVICE(PCI_VENDOR_ID_NI, PCI_DEVICE_ID_NI_PCI6503X) },
	{ PCI_DEVICE(PCI_VENDOR_ID_NI, PCI_DEVICE_ID_NI_PXI_6503) },
	{ 0 }
	};
	MODULE_DEVICE_TABLE(pci, pci_8255_pci_table);

	static struct pci_driver pci_8255_pci_driver = {
	.name = "8255_pci",
	.id_table = pci_8255_pci_table,
	.probe = pci_8255_pci_probe,
	.remove = pci_8255_pci_remove,
	};
	module_comedi_pci_driver(pci_8255_driver, pci_8255_pci_driver);

	MODULE_DESCRIPTION("COMEDI - Generic PCI based 8255 Digital I/O boards");
	MODULE_AUTHOR("Comedi http://www.comedi.org");
	MODULE_LICENSE("GPL");