drivers/pci/pci-sysfs.c - kernel/msm-4.19 - Gitiles

 /*
  * drivers/pci/pci-sysfs.c
  *
  * (C) Copyright 2002-2004 Greg Kroah-Hartman <greg@kroah.com>
  * (C) Copyright 2002-2004 IBM Corp.
  * (C) Copyright 2003 Matthew Wilcox
  * (C) Copyright 2003 Hewlett-Packard
  * (C) Copyright 2004 Jon Smirl <jonsmirl@yahoo.com>
  * (C) Copyright 2004 Silicon Graphics, Inc. Jesse Barnes <jbarnes@sgi.com>
  *
  * File attributes for PCI devices
  *
  * Modeled after usb's driverfs.c
  *
  */


 #include <linux/config.h>
 #include <linux/kernel.h>
 #include <linux/pci.h>
 #include <linux/stat.h>
 #include <linux/topology.h>
 #include <linux/mm.h>

 #include "pci.h"

 static int sysfs_initialized;	/* = 0 */

 /* show configuration fields */
 #define pci_config_attr(field, format_string)				\
 static ssize_t								\
 field##_show(struct device *dev, struct device_attribute *attr, char *buf)				\
 {									\
 	struct pci_dev *pdev;						\
 									\
 	pdev = to_pci_dev (dev);					\
 	return sprintf (buf, format_string, pdev->field);		\
 }

 pci_config_attr(vendor, "0x%04x\n");
 pci_config_attr(device, "0x%04x\n");
 pci_config_attr(subsystem_vendor, "0x%04x\n");
 pci_config_attr(subsystem_device, "0x%04x\n");
 pci_config_attr(class, "0x%06x\n");
 pci_config_attr(irq, "%u\n");

 static ssize_t local_cpus_show(struct device *dev, struct device_attribute *attr, char *buf)
 {
 	cpumask_t mask = pcibus_to_cpumask(to_pci_dev(dev)->bus);
 	int len = cpumask_scnprintf(buf, PAGE_SIZE-2, mask);
 	strcat(buf,"\n");
 	return 1+len;
 }

 /* show resources */
 static ssize_t
 resource_show(struct device * dev, struct device_attribute *attr, char * buf)
 {
 	struct pci_dev * pci_dev = to_pci_dev(dev);
 	char * str = buf;
 	int i;
 	int max = 7;

 	if (pci_dev->subordinate)
 		max = DEVICE_COUNT_RESOURCE;

 	for (i = 0; i < max; i++) {
 		str += sprintf(str,"0x%016lx 0x%016lx 0x%016lx\n",
 			       pci_resource_start(pci_dev,i),
 			       pci_resource_end(pci_dev,i),
 			       pci_resource_flags(pci_dev,i));
 	}
 	return (str - buf);
 }

 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, char *buf)
 {
 	struct pci_dev *pci_dev = to_pci_dev(dev);

 	return sprintf(buf, "pci:v%08Xd%08Xsv%08Xsd%08Xbc%02Xsc%02Xi%02x\n",
 		       pci_dev->vendor, pci_dev->device,
 		       pci_dev->subsystem_vendor, pci_dev->subsystem_device,
 		       (u8)(pci_dev->class >> 16), (u8)(pci_dev->class >> 8),
 		       (u8)(pci_dev->class));
 }

 struct device_attribute pci_dev_attrs[] = {
 	__ATTR_RO(resource),
 	__ATTR_RO(vendor),
 	__ATTR_RO(device),
 	__ATTR_RO(subsystem_vendor),
 	__ATTR_RO(subsystem_device),
 	__ATTR_RO(class),
 	__ATTR_RO(irq),
 	__ATTR_RO(local_cpus),
 	__ATTR_RO(modalias),
 	__ATTR_NULL,
 };

 static ssize_t
 pci_read_config(struct kobject *kobj, char *buf, loff_t off, size_t count)
 {
 	struct pci_dev *dev = to_pci_dev(container_of(kobj,struct device,kobj));
 	unsigned int size = 64;
 	loff_t init_off = off;
 	u8 *data = (u8*) buf;

 	/* Several chips lock up trying to read undefined config space */
 	if (capable(CAP_SYS_ADMIN)) {
 		size = dev->cfg_size;
 	} else if (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) {
 		size = 128;
 	}

 	if (off > size)
 		return 0;
 	if (off + count > size) {
 		size -= off;
 		count = size;
 	} else {
 		size = count;
 	}

 	if ((off & 1) && size) {
 		u8 val;
 		pci_read_config_byte(dev, off, &val);
 		data[off - init_off] = val;
 		off++;
 		size--;
 	}

 	if ((off & 3) && size > 2) {
 		u16 val;
 		pci_read_config_word(dev, off, &val);
 		data[off - init_off] = val & 0xff;
 		data[off - init_off + 1] = (val >> 8) & 0xff;
 		off += 2;
 		size -= 2;
 	}

 	while (size > 3) {
 		u32 val;
 		pci_read_config_dword(dev, off, &val);
 		data[off - init_off] = val & 0xff;
 		data[off - init_off + 1] = (val >> 8) & 0xff;
 		data[off - init_off + 2] = (val >> 16) & 0xff;
 		data[off - init_off + 3] = (val >> 24) & 0xff;
 		off += 4;
 		size -= 4;
 	}

 	if (size >= 2) {
 		u16 val;
 		pci_read_config_word(dev, off, &val);
 		data[off - init_off] = val & 0xff;
 		data[off - init_off + 1] = (val >> 8) & 0xff;
 		off += 2;
 		size -= 2;
 	}

 	if (size > 0) {
 		u8 val;
 		pci_read_config_byte(dev, off, &val);
 		data[off - init_off] = val;
 		off++;
 		--size;
 	}

 	return count;
 }

 static ssize_t
 pci_write_config(struct kobject *kobj, char *buf, loff_t off, size_t count)
 {
 	struct pci_dev *dev = to_pci_dev(container_of(kobj,struct device,kobj));
 	unsigned int size = count;
 	loff_t init_off = off;
 	u8 *data = (u8*) buf;

 	if (off > dev->cfg_size)
 		return 0;
 	if (off + count > dev->cfg_size) {
 		size = dev->cfg_size - off;
 		count = size;
 	}

 	if ((off & 1) && size) {
 		pci_write_config_byte(dev, off, data[off - init_off]);
 		off++;
 		size--;
 	}

 	if ((off & 3) && size > 2) {
 		u16 val = data[off - init_off];
 		val |= (u16) data[off - init_off + 1] << 8;
                 pci_write_config_word(dev, off, val);
                 off += 2;
                 size -= 2;
         }

 	while (size > 3) {
 		u32 val = data[off - init_off];
 		val |= (u32) data[off - init_off + 1] << 8;
 		val |= (u32) data[off - init_off + 2] << 16;
 		val |= (u32) data[off - init_off + 3] << 24;
 		pci_write_config_dword(dev, off, val);
 		off += 4;
 		size -= 4;
 	}

 	if (size >= 2) {
 		u16 val = data[off - init_off];
 		val |= (u16) data[off - init_off + 1] << 8;
 		pci_write_config_word(dev, off, val);
 		off += 2;
 		size -= 2;
 	}

 	if (size) {
 		pci_write_config_byte(dev, off, data[off - init_off]);
 		off++;
 		--size;
 	}

 	return count;
 }

 #ifdef HAVE_PCI_LEGACY
 /**
  * pci_read_legacy_io - read byte(s) from legacy I/O port space
  * @kobj: kobject corresponding to file to read from
  * @buf: buffer to store results
  * @off: offset into legacy I/O port space
  * @count: number of bytes to read
  *
  * Reads 1, 2, or 4 bytes from legacy I/O port space using an arch specific
  * callback routine (pci_legacy_read).
  */
 ssize_t
 pci_read_legacy_io(struct kobject *kobj, char *buf, loff_t off, size_t count)
 {
         struct pci_bus *bus = to_pci_bus(container_of(kobj,
                                                       struct class_device,
 						      kobj));

         /* Only support 1, 2 or 4 byte accesses */
         if (count != 1 && count != 2 && count != 4)
                 return -EINVAL;

         return pci_legacy_read(bus, off, (u32 *)buf, count);
 }

 /**
  * pci_write_legacy_io - write byte(s) to legacy I/O port space
  * @kobj: kobject corresponding to file to read from
  * @buf: buffer containing value to be written
  * @off: offset into legacy I/O port space
  * @count: number of bytes to write
  *
  * Writes 1, 2, or 4 bytes from legacy I/O port space using an arch specific
  * callback routine (pci_legacy_write).
  */
 ssize_t
 pci_write_legacy_io(struct kobject *kobj, char *buf, loff_t off, size_t count)
 {
         struct pci_bus *bus = to_pci_bus(container_of(kobj,
 						      struct class_device,
 						      kobj));
         /* Only support 1, 2 or 4 byte accesses */
         if (count != 1 && count != 2 && count != 4)
                 return -EINVAL;

         return pci_legacy_write(bus, off, *(u32 *)buf, count);
 }

 /**
  * pci_mmap_legacy_mem - map legacy PCI memory into user memory space
  * @kobj: kobject corresponding to device to be mapped
  * @attr: struct bin_attribute for this file
  * @vma: struct vm_area_struct passed to mmap
  *
  * Uses an arch specific callback, pci_mmap_legacy_page_range, to mmap
  * legacy memory space (first meg of bus space) into application virtual
  * memory space.
  */
 int
 pci_mmap_legacy_mem(struct kobject *kobj, struct bin_attribute *attr,
                     struct vm_area_struct *vma)
 {
         struct pci_bus *bus = to_pci_bus(container_of(kobj,
                                                       struct class_device,
 						      kobj));

         return pci_mmap_legacy_page_range(bus, vma);
 }
 #endif /* HAVE_PCI_LEGACY */

 #ifdef HAVE_PCI_MMAP
 /**
  * pci_mmap_resource - map a PCI resource into user memory space
  * @kobj: kobject for mapping
  * @attr: struct bin_attribute for the file being mapped
  * @vma: struct vm_area_struct passed into the mmap
  *
  * Use the regular PCI mapping routines to map a PCI resource into userspace.
  * FIXME: write combining?  maybe automatic for prefetchable regions?
  */
 static int
 pci_mmap_resource(struct kobject *kobj, struct bin_attribute *attr,
 		  struct vm_area_struct *vma)
 {
 	struct pci_dev *pdev = to_pci_dev(container_of(kobj,
 						       struct device, kobj));
 	struct resource *res = (struct resource *)attr->private;
 	enum pci_mmap_state mmap_type;

 	vma->vm_pgoff += res->start >> PAGE_SHIFT;
 	mmap_type = res->flags & IORESOURCE_MEM ? pci_mmap_mem : pci_mmap_io;

 	return pci_mmap_page_range(pdev, vma, mmap_type, 0);
 }

 /**
  * pci_create_resource_files - create resource files in sysfs for @dev
  * @dev: dev in question
  *
  * Walk the resources in @dev creating files for each resource available.
  */
 static void
 pci_create_resource_files(struct pci_dev *pdev)
 {
 	int i;

 	/* Expose the PCI resources from this device as files */
 	for (i = 0; i < PCI_ROM_RESOURCE; i++) {
 		struct bin_attribute *res_attr;

 		/* skip empty resources */
 		if (!pci_resource_len(pdev, i))
 			continue;

 		/* allocate attribute structure, piggyback attribute name */
 		res_attr = kcalloc(1, sizeof(*res_attr) + 10, GFP_ATOMIC);
 		if (res_attr) {
 			char *res_attr_name = (char *)(res_attr + 1);

 			pdev->res_attr[i] = res_attr;
 			sprintf(res_attr_name, "resource%d", i);
 			res_attr->attr.name = res_attr_name;
 			res_attr->attr.mode = S_IRUSR | S_IWUSR;
 			res_attr->attr.owner = THIS_MODULE;
 			res_attr->size = pci_resource_len(pdev, i);
 			res_attr->mmap = pci_mmap_resource;
 			res_attr->private = &pdev->resource[i];
 			sysfs_create_bin_file(&pdev->dev.kobj, res_attr);
 		}
 	}
 }

 /**
  * pci_remove_resource_files - cleanup resource files
  * @dev: dev to cleanup
  *
  * If we created resource files for @dev, remove them from sysfs and
  * free their resources.
  */
 static void
 pci_remove_resource_files(struct pci_dev *pdev)
 {
 	int i;

 	for (i = 0; i < PCI_ROM_RESOURCE; i++) {
 		struct bin_attribute *res_attr;

 		res_attr = pdev->res_attr[i];
 		if (res_attr) {
 			sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
 			kfree(res_attr);
 		}
 	}
 }
 #else /* !HAVE_PCI_MMAP */
 static inline void pci_create_resource_files(struct pci_dev *dev) { return; }
 static inline void pci_remove_resource_files(struct pci_dev *dev) { return; }
 #endif /* HAVE_PCI_MMAP */

 /**
  * pci_write_rom - used to enable access to the PCI ROM display
  * @kobj: kernel object handle
  * @buf: user input
  * @off: file offset
  * @count: number of byte in input
  *
  * writing anything except 0 enables it
  */
 static ssize_t
 pci_write_rom(struct kobject *kobj, char *buf, loff_t off, size_t count)
 {
 	struct pci_dev *pdev = to_pci_dev(container_of(kobj, struct device, kobj));

 	if ((off ==  0) && (*buf == '0') && (count == 2))
 		pdev->rom_attr_enabled = 0;
 	else
 		pdev->rom_attr_enabled = 1;

 	return count;
 }

 /**
  * pci_read_rom - read a PCI ROM
  * @kobj: kernel object handle
  * @buf: where to put the data we read from the ROM
  * @off: file offset
  * @count: number of bytes to read
  *
  * Put @count bytes starting at @off into @buf from the ROM in the PCI
  * device corresponding to @kobj.
  */
 static ssize_t
 pci_read_rom(struct kobject *kobj, char *buf, loff_t off, size_t count)
 {
 	struct pci_dev *pdev = to_pci_dev(container_of(kobj, struct device, kobj));
 	void __iomem *rom;
 	size_t size;

 	if (!pdev->rom_attr_enabled)
 		return -EINVAL;

 	rom = pci_map_rom(pdev, &size);	/* size starts out as PCI window size */
 	if (!rom)
 		return 0;

 	if (off >= size)
 		count = 0;
 	else {
 		if (off + count > size)
 			count = size - off;

 		memcpy_fromio(buf, rom + off, count);
 	}
 	pci_unmap_rom(pdev, rom);

 	return count;
 }

 static struct bin_attribute pci_config_attr = {
 	.attr =	{
 		.name = "config",
 		.mode = S_IRUGO | S_IWUSR,
 		.owner = THIS_MODULE,
 	},
 	.size = 256,
 	.read = pci_read_config,
 	.write = pci_write_config,
 };

 static struct bin_attribute pcie_config_attr = {
 	.attr =	{
 		.name = "config",
 		.mode = S_IRUGO | S_IWUSR,
 		.owner = THIS_MODULE,
 	},
 	.size = 4096,
 	.read = pci_read_config,
 	.write = pci_write_config,
 };

 int pci_create_sysfs_dev_files (struct pci_dev *pdev)
 {
 	if (!sysfs_initialized)
 		return -EACCES;

 	if (pdev->cfg_size < 4096)
 		sysfs_create_bin_file(&pdev->dev.kobj, &pci_config_attr);
 	else
 		sysfs_create_bin_file(&pdev->dev.kobj, &pcie_config_attr);

 	pci_create_resource_files(pdev);

 	/* If the device has a ROM, try to expose it in sysfs. */
 	if (pci_resource_len(pdev, PCI_ROM_RESOURCE)) {
 		struct bin_attribute *rom_attr;

 		rom_attr = kmalloc(sizeof(*rom_attr), GFP_ATOMIC);
 		if (rom_attr) {
 			memset(rom_attr, 0x00, sizeof(*rom_attr));
 			pdev->rom_attr = rom_attr;
 			rom_attr->size = pci_resource_len(pdev, PCI_ROM_RESOURCE);
 			rom_attr->attr.name = "rom";
 			rom_attr->attr.mode = S_IRUSR;
 			rom_attr->attr.owner = THIS_MODULE;
 			rom_attr->read = pci_read_rom;
 			rom_attr->write = pci_write_rom;
 			sysfs_create_bin_file(&pdev->dev.kobj, rom_attr);
 		}
 	}
 	/* add platform-specific attributes */
 	pcibios_add_platform_entries(pdev);

 	return 0;
 }

 /**
  * pci_remove_sysfs_dev_files - cleanup PCI specific sysfs files
  * @pdev: device whose entries we should free
  *
  * Cleanup when @pdev is removed from sysfs.
  */
 void pci_remove_sysfs_dev_files(struct pci_dev *pdev)
 {
 	if (pdev->cfg_size < 4096)
 		sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr);
 	else
 		sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr);

 	pci_remove_resource_files(pdev);

 	if (pci_resource_len(pdev, PCI_ROM_RESOURCE)) {
 		if (pdev->rom_attr) {
 			sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr);
 			kfree(pdev->rom_attr);
 		}
 	}
 }

 static int __init pci_sysfs_init(void)
 {
 	struct pci_dev *pdev = NULL;

 	sysfs_initialized = 1;
 	for_each_pci_dev(pdev)
 		pci_create_sysfs_dev_files(pdev);

 	return 0;
 }

 __initcall(pci_sysfs_init);
	/*
	* drivers/pci/pci-sysfs.c
	*
	* (C) Copyright 2002-2004 Greg Kroah-Hartman <greg@kroah.com>
	* (C) Copyright 2002-2004 IBM Corp.
	* (C) Copyright 2003 Matthew Wilcox
	* (C) Copyright 2003 Hewlett-Packard
	* (C) Copyright 2004 Jon Smirl <jonsmirl@yahoo.com>
	* (C) Copyright 2004 Silicon Graphics, Inc. Jesse Barnes <jbarnes@sgi.com>
	*
	* File attributes for PCI devices
	*
	* Modeled after usb's driverfs.c
	*
	*/


	#include <linux/config.h>
	#include <linux/kernel.h>
	#include <linux/pci.h>
	#include <linux/stat.h>
	#include <linux/topology.h>
	#include <linux/mm.h>

	#include "pci.h"

	static int sysfs_initialized; /* = 0 */

	/* show configuration fields */
	#define pci_config_attr(field, format_string) \
	static ssize_t \
	field##_show(struct device dev, struct device_attribute attr, char *buf) \
	{ \
	struct pci_dev *pdev; \
	\
	pdev = to_pci_dev (dev); \
	return sprintf (buf, format_string, pdev->field); \
	}

	pci_config_attr(vendor, "0x%04x\n");
	pci_config_attr(device, "0x%04x\n");
	pci_config_attr(subsystem_vendor, "0x%04x\n");
	pci_config_attr(subsystem_device, "0x%04x\n");
	pci_config_attr(class, "0x%06x\n");
	pci_config_attr(irq, "%u\n");

	static ssize_t local_cpus_show(struct device dev, struct device_attribute attr, char *buf)
	{
	cpumask_t mask = pcibus_to_cpumask(to_pci_dev(dev)->bus);
	int len = cpumask_scnprintf(buf, PAGE_SIZE-2, mask);
	strcat(buf,"\n");
	return 1+len;
	}

	/* show resources */
	static ssize_t
	resource_show(struct device * dev, struct device_attribute attr, char buf)
	{
	struct pci_dev * pci_dev = to_pci_dev(dev);
	char * str = buf;
	int i;
	int max = 7;

	if (pci_dev->subordinate)
	max = DEVICE_COUNT_RESOURCE;

	for (i = 0; i < max; i++) {
	str += sprintf(str,"0x%016lx 0x%016lx 0x%016lx\n",
	pci_resource_start(pci_dev,i),
	pci_resource_end(pci_dev,i),
	pci_resource_flags(pci_dev,i));
	}
	return (str - buf);
	}

	static ssize_t modalias_show(struct device dev, struct device_attribute attr, char *buf)
	{
	struct pci_dev *pci_dev = to_pci_dev(dev);

	return sprintf(buf, "pci:v%08Xd%08Xsv%08Xsd%08Xbc%02Xsc%02Xi%02x\n",
	pci_dev->vendor, pci_dev->device,
	pci_dev->subsystem_vendor, pci_dev->subsystem_device,
	(u8)(pci_dev->class >> 16), (u8)(pci_dev->class >> 8),
	(u8)(pci_dev->class));
	}

	struct device_attribute pci_dev_attrs[] = {
	__ATTR_RO(resource),
	__ATTR_RO(vendor),
	__ATTR_RO(device),
	__ATTR_RO(subsystem_vendor),
	__ATTR_RO(subsystem_device),
	__ATTR_RO(class),
	__ATTR_RO(irq),
	__ATTR_RO(local_cpus),
	__ATTR_RO(modalias),
	__ATTR_NULL,
	};

	static ssize_t
	pci_read_config(struct kobject kobj, char buf, loff_t off, size_t count)
	{
	struct pci_dev *dev = to_pci_dev(container_of(kobj,struct device,kobj));
	unsigned int size = 64;
	loff_t init_off = off;
	u8 data = (u8) buf;

	/* Several chips lock up trying to read undefined config space */
	if (capable(CAP_SYS_ADMIN)) {
	size = dev->cfg_size;
	} else if (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS) {
	size = 128;
	}

	if (off > size)
	return 0;
	if (off + count > size) {
	size -= off;
	count = size;
	} else {
	size = count;
	}

	if ((off & 1) && size) {
	u8 val;
	pci_read_config_byte(dev, off, &val);
	data[off - init_off] = val;
	off++;
	size--;
	}

	if ((off & 3) && size > 2) {
	u16 val;
	pci_read_config_word(dev, off, &val);
	data[off - init_off] = val & 0xff;
	data[off - init_off + 1] = (val >> 8) & 0xff;
	off += 2;
	size -= 2;
	}

	while (size > 3) {
	u32 val;
	pci_read_config_dword(dev, off, &val);
	data[off - init_off] = val & 0xff;
	data[off - init_off + 1] = (val >> 8) & 0xff;
	data[off - init_off + 2] = (val >> 16) & 0xff;
	data[off - init_off + 3] = (val >> 24) & 0xff;
	off += 4;
	size -= 4;
	}

	if (size >= 2) {
	u16 val;
	pci_read_config_word(dev, off, &val);
	data[off - init_off] = val & 0xff;
	data[off - init_off + 1] = (val >> 8) & 0xff;
	off += 2;
	size -= 2;
	}

	if (size > 0) {
	u8 val;
	pci_read_config_byte(dev, off, &val);
	data[off - init_off] = val;
	off++;
	--size;
	}

	return count;
	}

	static ssize_t
	pci_write_config(struct kobject kobj, char buf, loff_t off, size_t count)
	{
	struct pci_dev *dev = to_pci_dev(container_of(kobj,struct device,kobj));
	unsigned int size = count;
	loff_t init_off = off;
	u8 data = (u8) buf;

	if (off > dev->cfg_size)
	return 0;
	if (off + count > dev->cfg_size) {
	size = dev->cfg_size - off;
	count = size;
	}

	if ((off & 1) && size) {
	pci_write_config_byte(dev, off, data[off - init_off]);
	off++;
	size--;
	}

	if ((off & 3) && size > 2) {
	u16 val = data[off - init_off];
	val \|= (u16) data[off - init_off + 1] << 8;
	pci_write_config_word(dev, off, val);
	off += 2;
	size -= 2;
	}

	while (size > 3) {
	u32 val = data[off - init_off];
	val \|= (u32) data[off - init_off + 1] << 8;
	val \|= (u32) data[off - init_off + 2] << 16;
	val \|= (u32) data[off - init_off + 3] << 24;
	pci_write_config_dword(dev, off, val);
	off += 4;
	size -= 4;
	}

	if (size >= 2) {
	u16 val = data[off - init_off];
	val \|= (u16) data[off - init_off + 1] << 8;
	pci_write_config_word(dev, off, val);
	off += 2;
	size -= 2;
	}

	if (size) {
	pci_write_config_byte(dev, off, data[off - init_off]);
	off++;
	--size;
	}

	return count;
	}

	#ifdef HAVE_PCI_LEGACY
	/**
	* pci_read_legacy_io - read byte(s) from legacy I/O port space
	* @kobj: kobject corresponding to file to read from
	* @buf: buffer to store results
	* @off: offset into legacy I/O port space
	* @count: number of bytes to read
	*
	* Reads 1, 2, or 4 bytes from legacy I/O port space using an arch specific
	* callback routine (pci_legacy_read).
	*/
	ssize_t
	pci_read_legacy_io(struct kobject kobj, char buf, loff_t off, size_t count)
	{
	struct pci_bus *bus = to_pci_bus(container_of(kobj,
	struct class_device,
	kobj));

	/* Only support 1, 2 or 4 byte accesses */
	if (count != 1 && count != 2 && count != 4)
	return -EINVAL;

	return pci_legacy_read(bus, off, (u32 *)buf, count);
	}

	/**
	* pci_write_legacy_io - write byte(s) to legacy I/O port space
	* @kobj: kobject corresponding to file to read from
	* @buf: buffer containing value to be written
	* @off: offset into legacy I/O port space
	* @count: number of bytes to write
	*
	* Writes 1, 2, or 4 bytes from legacy I/O port space using an arch specific
	* callback routine (pci_legacy_write).
	*/
	ssize_t
	pci_write_legacy_io(struct kobject kobj, char buf, loff_t off, size_t count)
	{
	struct pci_bus *bus = to_pci_bus(container_of(kobj,
	struct class_device,
	kobj));
	/* Only support 1, 2 or 4 byte accesses */
	if (count != 1 && count != 2 && count != 4)
	return -EINVAL;

	return pci_legacy_write(bus, off, (u32 )buf, count);
	}

	/**
	* pci_mmap_legacy_mem - map legacy PCI memory into user memory space
	* @kobj: kobject corresponding to device to be mapped
	* @attr: struct bin_attribute for this file
	* @vma: struct vm_area_struct passed to mmap
	*
	* Uses an arch specific callback, pci_mmap_legacy_page_range, to mmap
	* legacy memory space (first meg of bus space) into application virtual
	* memory space.
	*/
	int
	pci_mmap_legacy_mem(struct kobject kobj, struct bin_attribute attr,
	struct vm_area_struct *vma)
	{
	struct pci_bus *bus = to_pci_bus(container_of(kobj,
	struct class_device,
	kobj));

	return pci_mmap_legacy_page_range(bus, vma);
	}
	#endif /* HAVE_PCI_LEGACY */

	#ifdef HAVE_PCI_MMAP
	/**
	* pci_mmap_resource - map a PCI resource into user memory space
	* @kobj: kobject for mapping
	* @attr: struct bin_attribute for the file being mapped
	* @vma: struct vm_area_struct passed into the mmap
	*
	* Use the regular PCI mapping routines to map a PCI resource into userspace.
	* FIXME: write combining? maybe automatic for prefetchable regions?
	*/
	static int
	pci_mmap_resource(struct kobject kobj, struct bin_attribute attr,
	struct vm_area_struct *vma)
	{
	struct pci_dev *pdev = to_pci_dev(container_of(kobj,
	struct device, kobj));
	struct resource res = (struct resource )attr->private;
	enum pci_mmap_state mmap_type;

	vma->vm_pgoff += res->start >> PAGE_SHIFT;
	mmap_type = res->flags & IORESOURCE_MEM ? pci_mmap_mem : pci_mmap_io;

	return pci_mmap_page_range(pdev, vma, mmap_type, 0);
	}

	/**
	* pci_create_resource_files - create resource files in sysfs for @dev
	* @dev: dev in question
	*
	* Walk the resources in @dev creating files for each resource available.
	*/
	static void
	pci_create_resource_files(struct pci_dev *pdev)
	{
	int i;

	/* Expose the PCI resources from this device as files */
	for (i = 0; i < PCI_ROM_RESOURCE; i++) {
	struct bin_attribute *res_attr;

	/* skip empty resources */
	if (!pci_resource_len(pdev, i))
	continue;

	/* allocate attribute structure, piggyback attribute name */
	res_attr = kcalloc(1, sizeof(*res_attr) + 10, GFP_ATOMIC);
	if (res_attr) {
	char res_attr_name = (char )(res_attr + 1);

	pdev->res_attr[i] = res_attr;
	sprintf(res_attr_name, "resource%d", i);
	res_attr->attr.name = res_attr_name;
	res_attr->attr.mode = S_IRUSR \| S_IWUSR;
	res_attr->attr.owner = THIS_MODULE;
	res_attr->size = pci_resource_len(pdev, i);
	res_attr->mmap = pci_mmap_resource;
	res_attr->private = &pdev->resource[i];
	sysfs_create_bin_file(&pdev->dev.kobj, res_attr);
	}
	}
	}

	/**
	* pci_remove_resource_files - cleanup resource files
	* @dev: dev to cleanup
	*
	* If we created resource files for @dev, remove them from sysfs and
	* free their resources.
	*/
	static void
	pci_remove_resource_files(struct pci_dev *pdev)
	{
	int i;

	for (i = 0; i < PCI_ROM_RESOURCE; i++) {
	struct bin_attribute *res_attr;

	res_attr = pdev->res_attr[i];
	if (res_attr) {
	sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
	kfree(res_attr);
	}
	}
	}
	#else /* !HAVE_PCI_MMAP */
	static inline void pci_create_resource_files(struct pci_dev *dev) { return; }
	static inline void pci_remove_resource_files(struct pci_dev *dev) { return; }
	#endif /* HAVE_PCI_MMAP */

	/**
	* pci_write_rom - used to enable access to the PCI ROM display
	* @kobj: kernel object handle
	* @buf: user input
	* @off: file offset
	* @count: number of byte in input
	*
	* writing anything except 0 enables it
	*/
	static ssize_t
	pci_write_rom(struct kobject kobj, char buf, loff_t off, size_t count)
	{
	struct pci_dev *pdev = to_pci_dev(container_of(kobj, struct device, kobj));

	if ((off == 0) && (*buf == '0') && (count == 2))
	pdev->rom_attr_enabled = 0;
	else
	pdev->rom_attr_enabled = 1;

	return count;
	}

	/**
	* pci_read_rom - read a PCI ROM
	* @kobj: kernel object handle
	* @buf: where to put the data we read from the ROM
	* @off: file offset
	* @count: number of bytes to read
	*
	* Put @count bytes starting at @off into @buf from the ROM in the PCI
	* device corresponding to @kobj.
	*/
	static ssize_t
	pci_read_rom(struct kobject kobj, char buf, loff_t off, size_t count)
	{
	struct pci_dev *pdev = to_pci_dev(container_of(kobj, struct device, kobj));
	void __iomem *rom;
	size_t size;

	if (!pdev->rom_attr_enabled)
	return -EINVAL;

	rom = pci_map_rom(pdev, &size); /* size starts out as PCI window size */
	if (!rom)
	return 0;

	if (off >= size)
	count = 0;
	else {
	if (off + count > size)
	count = size - off;

	memcpy_fromio(buf, rom + off, count);
	}
	pci_unmap_rom(pdev, rom);

	return count;
	}

	static struct bin_attribute pci_config_attr = {
	.attr = {
	.name = "config",
	.mode = S_IRUGO \| S_IWUSR,
	.owner = THIS_MODULE,
	},
	.size = 256,
	.read = pci_read_config,
	.write = pci_write_config,
	};

	static struct bin_attribute pcie_config_attr = {
	.attr = {
	.name = "config",
	.mode = S_IRUGO \| S_IWUSR,
	.owner = THIS_MODULE,
	},
	.size = 4096,
	.read = pci_read_config,
	.write = pci_write_config,
	};

	int pci_create_sysfs_dev_files (struct pci_dev *pdev)
	{
	if (!sysfs_initialized)
	return -EACCES;

	if (pdev->cfg_size < 4096)
	sysfs_create_bin_file(&pdev->dev.kobj, &pci_config_attr);
	else
	sysfs_create_bin_file(&pdev->dev.kobj, &pcie_config_attr);

	pci_create_resource_files(pdev);

	/* If the device has a ROM, try to expose it in sysfs. */
	if (pci_resource_len(pdev, PCI_ROM_RESOURCE)) {
	struct bin_attribute *rom_attr;

	rom_attr = kmalloc(sizeof(*rom_attr), GFP_ATOMIC);
	if (rom_attr) {
	memset(rom_attr, 0x00, sizeof(*rom_attr));
	pdev->rom_attr = rom_attr;
	rom_attr->size = pci_resource_len(pdev, PCI_ROM_RESOURCE);
	rom_attr->attr.name = "rom";
	rom_attr->attr.mode = S_IRUSR;
	rom_attr->attr.owner = THIS_MODULE;
	rom_attr->read = pci_read_rom;
	rom_attr->write = pci_write_rom;
	sysfs_create_bin_file(&pdev->dev.kobj, rom_attr);
	}
	}
	/* add platform-specific attributes */
	pcibios_add_platform_entries(pdev);

	return 0;
	}

	/**
	* pci_remove_sysfs_dev_files - cleanup PCI specific sysfs files
	* @pdev: device whose entries we should free
	*
	* Cleanup when @pdev is removed from sysfs.
	*/
	void pci_remove_sysfs_dev_files(struct pci_dev *pdev)
	{
	if (pdev->cfg_size < 4096)
	sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr);
	else
	sysfs_remove_bin_file(&pdev->dev.kobj, &pcie_config_attr);

	pci_remove_resource_files(pdev);

	if (pci_resource_len(pdev, PCI_ROM_RESOURCE)) {
	if (pdev->rom_attr) {
	sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr);
	kfree(pdev->rom_attr);
	}
	}
	}

	static int __init pci_sysfs_init(void)
	{
	struct pci_dev *pdev = NULL;

	sysfs_initialized = 1;
	for_each_pci_dev(pdev)
	pci_create_sysfs_dev_files(pdev);

	return 0;
	}

	__initcall(pci_sysfs_init);