drivers/pci/proc.c - LeafOS-Devices/android_kernel_samsung_gta4xl - Gitiles

 /*
  *	$Id: proc.c,v 1.13 1998/05/12 07:36:07 mj Exp $
  *
  *	Procfs interface for the PCI bus.
  *
  *	Copyright (c) 1997--1999 Martin Mares <mj@ucw.cz>
  */

 #include <linux/init.h>
 #include <linux/pci.h>
 #include <linux/module.h>
 #include <linux/proc_fs.h>
 #include <linux/seq_file.h>
 #include <linux/smp_lock.h>

 #include <asm/uaccess.h>
 #include <asm/byteorder.h>
 #include "pci.h"

 static int proc_initialized;	/* = 0 */

 static loff_t
 proc_bus_pci_lseek(struct file *file, loff_t off, int whence)
 {
 	loff_t new = -1;
 	struct inode *inode = file->f_dentry->d_inode;

 	mutex_lock(&inode->i_mutex);
 	switch (whence) {
 	case 0:
 		new = off;
 		break;
 	case 1:
 		new = file->f_pos + off;
 		break;
 	case 2:
 		new = inode->i_size + off;
 		break;
 	}
 	if (new < 0 || new > inode->i_size)
 		new = -EINVAL;
 	else
 		file->f_pos = new;
 	mutex_unlock(&inode->i_mutex);
 	return new;
 }

 static ssize_t
 proc_bus_pci_read(struct file *file, char __user *buf, size_t nbytes, loff_t *ppos)
 {
 	const struct inode *ino = file->f_dentry->d_inode;
 	const struct proc_dir_entry *dp = PDE(ino);
 	struct pci_dev *dev = dp->data;
 	unsigned int pos = *ppos;
 	unsigned int cnt, size;

 	/*
 	 * Normal users can read only the standardized portion of the
 	 * configuration space as several chips lock up when trying to read
 	 * undefined locations (think of Intel PIIX4 as a typical example).
 	 */

 	if (capable(CAP_SYS_ADMIN))
 		size = dev->cfg_size;
 	else if (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
 		size = 128;
 	else
 		size = 64;

 	if (pos >= size)
 		return 0;
 	if (nbytes >= size)
 		nbytes = size;
 	if (pos + nbytes > size)
 		nbytes = size - pos;
 	cnt = nbytes;

 	if (!access_ok(VERIFY_WRITE, buf, cnt))
 		return -EINVAL;

 	if ((pos & 1) && cnt) {
 		unsigned char val;
 		pci_user_read_config_byte(dev, pos, &val);
 		__put_user(val, buf);
 		buf++;
 		pos++;
 		cnt--;
 	}

 	if ((pos & 3) && cnt > 2) {
 		unsigned short val;
 		pci_user_read_config_word(dev, pos, &val);
 		__put_user(cpu_to_le16(val), (unsigned short __user *) buf);
 		buf += 2;
 		pos += 2;
 		cnt -= 2;
 	}

 	while (cnt >= 4) {
 		unsigned int val;
 		pci_user_read_config_dword(dev, pos, &val);
 		__put_user(cpu_to_le32(val), (unsigned int __user *) buf);
 		buf += 4;
 		pos += 4;
 		cnt -= 4;
 	}

 	if (cnt >= 2) {
 		unsigned short val;
 		pci_user_read_config_word(dev, pos, &val);
 		__put_user(cpu_to_le16(val), (unsigned short __user *) buf);
 		buf += 2;
 		pos += 2;
 		cnt -= 2;
 	}

 	if (cnt) {
 		unsigned char val;
 		pci_user_read_config_byte(dev, pos, &val);
 		__put_user(val, buf);
 		buf++;
 		pos++;
 		cnt--;
 	}

 	*ppos = pos;
 	return nbytes;
 }

 static ssize_t
 proc_bus_pci_write(struct file *file, const char __user *buf, size_t nbytes, loff_t *ppos)
 {
 	const struct inode *ino = file->f_dentry->d_inode;
 	const struct proc_dir_entry *dp = PDE(ino);
 	struct pci_dev *dev = dp->data;
 	int pos = *ppos;
 	int size = dev->cfg_size;
 	int cnt;

 	if (pos >= size)
 		return 0;
 	if (nbytes >= size)
 		nbytes = size;
 	if (pos + nbytes > size)
 		nbytes = size - pos;
 	cnt = nbytes;

 	if (!access_ok(VERIFY_READ, buf, cnt))
 		return -EINVAL;

 	if ((pos & 1) && cnt) {
 		unsigned char val;
 		__get_user(val, buf);
 		pci_user_write_config_byte(dev, pos, val);
 		buf++;
 		pos++;
 		cnt--;
 	}

 	if ((pos & 3) && cnt > 2) {
 		unsigned short val;
 		__get_user(val, (unsigned short __user *) buf);
 		pci_user_write_config_word(dev, pos, le16_to_cpu(val));
 		buf += 2;
 		pos += 2;
 		cnt -= 2;
 	}

 	while (cnt >= 4) {
 		unsigned int val;
 		__get_user(val, (unsigned int __user *) buf);
 		pci_user_write_config_dword(dev, pos, le32_to_cpu(val));
 		buf += 4;
 		pos += 4;
 		cnt -= 4;
 	}

 	if (cnt >= 2) {
 		unsigned short val;
 		__get_user(val, (unsigned short __user *) buf);
 		pci_user_write_config_word(dev, pos, le16_to_cpu(val));
 		buf += 2;
 		pos += 2;
 		cnt -= 2;
 	}

 	if (cnt) {
 		unsigned char val;
 		__get_user(val, buf);
 		pci_user_write_config_byte(dev, pos, val);
 		buf++;
 		pos++;
 		cnt--;
 	}

 	*ppos = pos;
 	return nbytes;
 }

 struct pci_filp_private {
 	enum pci_mmap_state mmap_state;
 	int write_combine;
 };

 static int proc_bus_pci_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
 {
 	const struct proc_dir_entry *dp = PDE(inode);
 	struct pci_dev *dev = dp->data;
 #ifdef HAVE_PCI_MMAP
 	struct pci_filp_private *fpriv = file->private_data;
 #endif /* HAVE_PCI_MMAP */
 	int ret = 0;

 	switch (cmd) {
 	case PCIIOC_CONTROLLER:
 		ret = pci_domain_nr(dev->bus);
 		break;

 #ifdef HAVE_PCI_MMAP
 	case PCIIOC_MMAP_IS_IO:
 		fpriv->mmap_state = pci_mmap_io;
 		break;

 	case PCIIOC_MMAP_IS_MEM:
 		fpriv->mmap_state = pci_mmap_mem;
 		break;

 	case PCIIOC_WRITE_COMBINE:
 		if (arg)
 			fpriv->write_combine = 1;
 		else
 			fpriv->write_combine = 0;
 		break;

 #endif /* HAVE_PCI_MMAP */

 	default:
 		ret = -EINVAL;
 		break;
 	};

 	return ret;
 }

 #ifdef HAVE_PCI_MMAP
 static int proc_bus_pci_mmap(struct file *file, struct vm_area_struct *vma)
 {
 	struct inode *inode = file->f_dentry->d_inode;
 	const struct proc_dir_entry *dp = PDE(inode);
 	struct pci_dev *dev = dp->data;
 	struct pci_filp_private *fpriv = file->private_data;
 	int ret;

 	if (!capable(CAP_SYS_RAWIO))
 		return -EPERM;

 	ret = pci_mmap_page_range(dev, vma,
 				  fpriv->mmap_state,
 				  fpriv->write_combine);
 	if (ret < 0)
 		return ret;

 	return 0;
 }

 static int proc_bus_pci_open(struct inode *inode, struct file *file)
 {
 	struct pci_filp_private *fpriv = kmalloc(sizeof(*fpriv), GFP_KERNEL);

 	if (!fpriv)
 		return -ENOMEM;

 	fpriv->mmap_state = pci_mmap_io;
 	fpriv->write_combine = 0;

 	file->private_data = fpriv;

 	return 0;
 }

 static int proc_bus_pci_release(struct inode *inode, struct file *file)
 {
 	kfree(file->private_data);
 	file->private_data = NULL;

 	return 0;
 }
 #endif /* HAVE_PCI_MMAP */

 static struct file_operations proc_bus_pci_operations = {
 	.llseek		= proc_bus_pci_lseek,
 	.read		= proc_bus_pci_read,
 	.write		= proc_bus_pci_write,
 	.ioctl		= proc_bus_pci_ioctl,
 #ifdef HAVE_PCI_MMAP
 	.open		= proc_bus_pci_open,
 	.release	= proc_bus_pci_release,
 	.mmap		= proc_bus_pci_mmap,
 #ifdef HAVE_ARCH_PCI_GET_UNMAPPED_AREA
 	.get_unmapped_area = get_pci_unmapped_area,
 #endif /* HAVE_ARCH_PCI_GET_UNMAPPED_AREA */
 #endif /* HAVE_PCI_MMAP */
 };

 /* iterator */
 static void *pci_seq_start(struct seq_file *m, loff_t *pos)
 {
 	struct pci_dev *dev = NULL;
 	loff_t n = *pos;

 	for_each_pci_dev(dev) {
 		if (!n--)
 			break;
 	}
 	return dev;
 }

 static void *pci_seq_next(struct seq_file *m, void *v, loff_t *pos)
 {
 	struct pci_dev *dev = v;

 	(*pos)++;
 	dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev);
 	return dev;
 }

 static void pci_seq_stop(struct seq_file *m, void *v)
 {
 	if (v) {
 		struct pci_dev *dev = v;
 		pci_dev_put(dev);
 	}
 }

 static int show_device(struct seq_file *m, void *v)
 {
 	const struct pci_dev *dev = v;
 	const struct pci_driver *drv;
 	int i;

 	if (dev == NULL)
 		return 0;

 	drv = pci_dev_driver(dev);
 	seq_printf(m, "%02x%02x\t%04x%04x\t%x",
 			dev->bus->number,
 			dev->devfn,
 			dev->vendor,
 			dev->device,
 			dev->irq);
 	/* Here should be 7 and not PCI_NUM_RESOURCES as we need to preserve compatibility */
 	for (i=0; i<7; i++) {
 		u64 start, end;
 		pci_resource_to_user(dev, i, &dev->resource[i], &start, &end);
 		seq_printf(m, "\t%16llx",
 			(unsigned long long)(start |
 			(dev->resource[i].flags & PCI_REGION_FLAG_MASK)));
 	}
 	for (i=0; i<7; i++) {
 		u64 start, end;
 		pci_resource_to_user(dev, i, &dev->resource[i], &start, &end);
 		seq_printf(m, "\t%16llx",
 			dev->resource[i].start < dev->resource[i].end ?
 			(unsigned long long)(end - start) + 1 : 0);
 	}
 	seq_putc(m, '\t');
 	if (drv)
 		seq_printf(m, "%s", drv->name);
 	seq_putc(m, '\n');
 	return 0;
 }

 static struct seq_operations proc_bus_pci_devices_op = {
 	.start	= pci_seq_start,
 	.next	= pci_seq_next,
 	.stop	= pci_seq_stop,
 	.show	= show_device
 };

 static struct proc_dir_entry *proc_bus_pci_dir;

 int pci_proc_attach_device(struct pci_dev *dev)
 {
 	struct pci_bus *bus = dev->bus;
 	struct proc_dir_entry *e;
 	char name[16];

 	if (!proc_initialized)
 		return -EACCES;

 	if (!bus->procdir) {
 		if (pci_proc_domain(bus)) {
 			sprintf(name, "%04x:%02x", pci_domain_nr(bus),
 					bus->number);
 		} else {
 			sprintf(name, "%02x", bus->number);
 		}
 		bus->procdir = proc_mkdir(name, proc_bus_pci_dir);
 		if (!bus->procdir)
 			return -ENOMEM;
 	}

 	sprintf(name, "%02x.%x", PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn));
 	e = create_proc_entry(name, S_IFREG | S_IRUGO | S_IWUSR, bus->procdir);
 	if (!e)
 		return -ENOMEM;
 	e->proc_fops = &proc_bus_pci_operations;
 	e->data = dev;
 	e->size = dev->cfg_size;
 	dev->procent = e;

 	return 0;
 }

 int pci_proc_detach_device(struct pci_dev *dev)
 {
 	struct proc_dir_entry *e;

 	if ((e = dev->procent)) {
 		if (atomic_read(&e->count))
 			return -EBUSY;
 		remove_proc_entry(e->name, dev->bus->procdir);
 		dev->procent = NULL;
 	}
 	return 0;
 }

 #if 0
 int pci_proc_attach_bus(struct pci_bus* bus)
 {
 	struct proc_dir_entry *de = bus->procdir;

 	if (!proc_initialized)
 		return -EACCES;

 	if (!de) {
 		char name[16];
 		sprintf(name, "%02x", bus->number);
 		de = bus->procdir = proc_mkdir(name, proc_bus_pci_dir);
 		if (!de)
 			return -ENOMEM;
 	}
 	return 0;
 }
 #endif  /*  0  */

 int pci_proc_detach_bus(struct pci_bus* bus)
 {
 	struct proc_dir_entry *de = bus->procdir;
 	if (de)
 		remove_proc_entry(de->name, proc_bus_pci_dir);
 	return 0;
 }

 static int proc_bus_pci_dev_open(struct inode *inode, struct file *file)
 {
 	return seq_open(file, &proc_bus_pci_devices_op);
 }
 static struct file_operations proc_bus_pci_dev_operations = {
 	.open		= proc_bus_pci_dev_open,
 	.read		= seq_read,
 	.llseek		= seq_lseek,
 	.release	= seq_release,
 };

 static int __init pci_proc_init(void)
 {
 	struct proc_dir_entry *entry;
 	struct pci_dev *dev = NULL;
 	proc_bus_pci_dir = proc_mkdir("pci", proc_bus);
 	entry = create_proc_entry("devices", 0, proc_bus_pci_dir);
 	if (entry)
 		entry->proc_fops = &proc_bus_pci_dev_operations;
 	proc_initialized = 1;
 	while ((dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL) {
 		pci_proc_attach_device(dev);
 	}
 	return 0;
 }

 __initcall(pci_proc_init);

 #ifdef CONFIG_HOTPLUG
 EXPORT_SYMBOL(pci_proc_attach_device);
 EXPORT_SYMBOL(pci_proc_detach_bus);
 #endif
	/*
	* $Id: proc.c,v 1.13 1998/05/12 07:36:07 mj Exp $
	*
	* Procfs interface for the PCI bus.
	*
	* Copyright (c) 1997--1999 Martin Mares <mj@ucw.cz>
	*/

	#include <linux/init.h>
	#include <linux/pci.h>
	#include <linux/module.h>
	#include <linux/proc_fs.h>
	#include <linux/seq_file.h>
	#include <linux/smp_lock.h>

	#include <asm/uaccess.h>
	#include <asm/byteorder.h>
	#include "pci.h"

	static int proc_initialized; /* = 0 */

	static loff_t
	proc_bus_pci_lseek(struct file *file, loff_t off, int whence)
	{
	loff_t new = -1;
	struct inode *inode = file->f_dentry->d_inode;

	mutex_lock(&inode->i_mutex);
	switch (whence) {
	case 0:
	new = off;
	break;
	case 1:
	new = file->f_pos + off;
	break;
	case 2:
	new = inode->i_size + off;
	break;
	}
	if (new < 0 \|\| new > inode->i_size)
	new = -EINVAL;
	else
	file->f_pos = new;
	mutex_unlock(&inode->i_mutex);
	return new;
	}

	static ssize_t
	proc_bus_pci_read(struct file file, char __user buf, size_t nbytes, loff_t *ppos)
	{
	const struct inode *ino = file->f_dentry->d_inode;
	const struct proc_dir_entry *dp = PDE(ino);
	struct pci_dev *dev = dp->data;
	unsigned int pos = *ppos;
	unsigned int cnt, size;

	/*
	* Normal users can read only the standardized portion of the
	* configuration space as several chips lock up when trying to read
	* undefined locations (think of Intel PIIX4 as a typical example).
	*/

	if (capable(CAP_SYS_ADMIN))
	size = dev->cfg_size;
	else if (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)
	size = 128;
	else
	size = 64;

	if (pos >= size)
	return 0;
	if (nbytes >= size)
	nbytes = size;
	if (pos + nbytes > size)
	nbytes = size - pos;
	cnt = nbytes;

	if (!access_ok(VERIFY_WRITE, buf, cnt))
	return -EINVAL;

	if ((pos & 1) && cnt) {
	unsigned char val;
	pci_user_read_config_byte(dev, pos, &val);
	__put_user(val, buf);
	buf++;
	pos++;
	cnt--;
	}

	if ((pos & 3) && cnt > 2) {
	unsigned short val;
	pci_user_read_config_word(dev, pos, &val);
	__put_user(cpu_to_le16(val), (unsigned short __user *) buf);
	buf += 2;
	pos += 2;
	cnt -= 2;
	}

	while (cnt >= 4) {
	unsigned int val;
	pci_user_read_config_dword(dev, pos, &val);
	__put_user(cpu_to_le32(val), (unsigned int __user *) buf);
	buf += 4;
	pos += 4;
	cnt -= 4;
	}

	if (cnt >= 2) {
	unsigned short val;
	pci_user_read_config_word(dev, pos, &val);
	__put_user(cpu_to_le16(val), (unsigned short __user *) buf);
	buf += 2;
	pos += 2;
	cnt -= 2;
	}

	if (cnt) {
	unsigned char val;
	pci_user_read_config_byte(dev, pos, &val);
	__put_user(val, buf);
	buf++;
	pos++;
	cnt--;
	}

	*ppos = pos;
	return nbytes;
	}

	static ssize_t
	proc_bus_pci_write(struct file file, const char __user buf, size_t nbytes, loff_t *ppos)
	{
	const struct inode *ino = file->f_dentry->d_inode;
	const struct proc_dir_entry *dp = PDE(ino);
	struct pci_dev *dev = dp->data;
	int pos = *ppos;
	int size = dev->cfg_size;
	int cnt;

	if (pos >= size)
	return 0;
	if (nbytes >= size)
	nbytes = size;
	if (pos + nbytes > size)
	nbytes = size - pos;
	cnt = nbytes;

	if (!access_ok(VERIFY_READ, buf, cnt))
	return -EINVAL;

	if ((pos & 1) && cnt) {
	unsigned char val;
	__get_user(val, buf);
	pci_user_write_config_byte(dev, pos, val);
	buf++;
	pos++;
	cnt--;
	}

	if ((pos & 3) && cnt > 2) {
	unsigned short val;
	__get_user(val, (unsigned short __user *) buf);
	pci_user_write_config_word(dev, pos, le16_to_cpu(val));
	buf += 2;
	pos += 2;
	cnt -= 2;
	}

	while (cnt >= 4) {
	unsigned int val;
	__get_user(val, (unsigned int __user *) buf);
	pci_user_write_config_dword(dev, pos, le32_to_cpu(val));
	buf += 4;
	pos += 4;
	cnt -= 4;
	}

	if (cnt >= 2) {
	unsigned short val;
	__get_user(val, (unsigned short __user *) buf);
	pci_user_write_config_word(dev, pos, le16_to_cpu(val));
	buf += 2;
	pos += 2;
	cnt -= 2;
	}

	if (cnt) {
	unsigned char val;
	__get_user(val, buf);
	pci_user_write_config_byte(dev, pos, val);
	buf++;
	pos++;
	cnt--;
	}

	*ppos = pos;
	return nbytes;
	}

	struct pci_filp_private {
	enum pci_mmap_state mmap_state;
	int write_combine;
	};

	static int proc_bus_pci_ioctl(struct inode inode, struct file file, unsigned int cmd, unsigned long arg)
	{
	const struct proc_dir_entry *dp = PDE(inode);
	struct pci_dev *dev = dp->data;
	#ifdef HAVE_PCI_MMAP
	struct pci_filp_private *fpriv = file->private_data;
	#endif /* HAVE_PCI_MMAP */
	int ret = 0;

	switch (cmd) {
	case PCIIOC_CONTROLLER:
	ret = pci_domain_nr(dev->bus);
	break;

	#ifdef HAVE_PCI_MMAP
	case PCIIOC_MMAP_IS_IO:
	fpriv->mmap_state = pci_mmap_io;
	break;

	case PCIIOC_MMAP_IS_MEM:
	fpriv->mmap_state = pci_mmap_mem;
	break;

	case PCIIOC_WRITE_COMBINE:
	if (arg)
	fpriv->write_combine = 1;
	else
	fpriv->write_combine = 0;
	break;

	#endif /* HAVE_PCI_MMAP */

	default:
	ret = -EINVAL;
	break;
	};

	return ret;
	}

	#ifdef HAVE_PCI_MMAP
	static int proc_bus_pci_mmap(struct file file, struct vm_area_struct vma)
	{
	struct inode *inode = file->f_dentry->d_inode;
	const struct proc_dir_entry *dp = PDE(inode);
	struct pci_dev *dev = dp->data;
	struct pci_filp_private *fpriv = file->private_data;
	int ret;

	if (!capable(CAP_SYS_RAWIO))
	return -EPERM;

	ret = pci_mmap_page_range(dev, vma,
	fpriv->mmap_state,
	fpriv->write_combine);
	if (ret < 0)
	return ret;

	return 0;
	}

	static int proc_bus_pci_open(struct inode inode, struct file file)
	{
	struct pci_filp_private fpriv = kmalloc(sizeof(fpriv), GFP_KERNEL);

	if (!fpriv)
	return -ENOMEM;

	fpriv->mmap_state = pci_mmap_io;
	fpriv->write_combine = 0;

	file->private_data = fpriv;

	return 0;
	}

	static int proc_bus_pci_release(struct inode inode, struct file file)
	{
	kfree(file->private_data);
	file->private_data = NULL;

	return 0;
	}
	#endif /* HAVE_PCI_MMAP */

	static struct file_operations proc_bus_pci_operations = {
	.llseek = proc_bus_pci_lseek,
	.read = proc_bus_pci_read,
	.write = proc_bus_pci_write,
	.ioctl = proc_bus_pci_ioctl,
	#ifdef HAVE_PCI_MMAP
	.open = proc_bus_pci_open,
	.release = proc_bus_pci_release,
	.mmap = proc_bus_pci_mmap,
	#ifdef HAVE_ARCH_PCI_GET_UNMAPPED_AREA
	.get_unmapped_area = get_pci_unmapped_area,
	#endif /* HAVE_ARCH_PCI_GET_UNMAPPED_AREA */
	#endif /* HAVE_PCI_MMAP */
	};

	/* iterator */
	static void pci_seq_start(struct seq_file m, loff_t *pos)
	{
	struct pci_dev *dev = NULL;
	loff_t n = *pos;

	for_each_pci_dev(dev) {
	if (!n--)
	break;
	}
	return dev;
	}

	static void pci_seq_next(struct seq_file m, void v, loff_t pos)
	{
	struct pci_dev *dev = v;

	(*pos)++;
	dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev);
	return dev;
	}

	static void pci_seq_stop(struct seq_file m, void v)
	{
	if (v) {
	struct pci_dev *dev = v;
	pci_dev_put(dev);
	}
	}

	static int show_device(struct seq_file m, void v)
	{
	const struct pci_dev *dev = v;
	const struct pci_driver *drv;
	int i;

	if (dev == NULL)
	return 0;

	drv = pci_dev_driver(dev);
	seq_printf(m, "%02x%02x\t%04x%04x\t%x",
	dev->bus->number,
	dev->devfn,
	dev->vendor,
	dev->device,
	dev->irq);
	/* Here should be 7 and not PCI_NUM_RESOURCES as we need to preserve compatibility */
	for (i=0; i<7; i++) {
	u64 start, end;
	pci_resource_to_user(dev, i, &dev->resource[i], &start, &end);
	seq_printf(m, "\t%16llx",
	(unsigned long long)(start \|
	(dev->resource[i].flags & PCI_REGION_FLAG_MASK)));
	}
	for (i=0; i<7; i++) {
	u64 start, end;
	pci_resource_to_user(dev, i, &dev->resource[i], &start, &end);
	seq_printf(m, "\t%16llx",
	dev->resource[i].start < dev->resource[i].end ?
	(unsigned long long)(end - start) + 1 : 0);
	}
	seq_putc(m, '\t');
	if (drv)
	seq_printf(m, "%s", drv->name);
	seq_putc(m, '\n');
	return 0;
	}

	static struct seq_operations proc_bus_pci_devices_op = {
	.start = pci_seq_start,
	.next = pci_seq_next,
	.stop = pci_seq_stop,
	.show = show_device
	};

	static struct proc_dir_entry *proc_bus_pci_dir;

	int pci_proc_attach_device(struct pci_dev *dev)
	{
	struct pci_bus *bus = dev->bus;
	struct proc_dir_entry *e;
	char name[16];

	if (!proc_initialized)
	return -EACCES;

	if (!bus->procdir) {
	if (pci_proc_domain(bus)) {
	sprintf(name, "%04x:%02x", pci_domain_nr(bus),
	bus->number);
	} else {
	sprintf(name, "%02x", bus->number);
	}
	bus->procdir = proc_mkdir(name, proc_bus_pci_dir);
	if (!bus->procdir)
	return -ENOMEM;
	}

	sprintf(name, "%02x.%x", PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn));
	e = create_proc_entry(name, S_IFREG \| S_IRUGO \| S_IWUSR, bus->procdir);
	if (!e)
	return -ENOMEM;
	e->proc_fops = &proc_bus_pci_operations;
	e->data = dev;
	e->size = dev->cfg_size;
	dev->procent = e;

	return 0;
	}

	int pci_proc_detach_device(struct pci_dev *dev)
	{
	struct proc_dir_entry *e;

	if ((e = dev->procent)) {
	if (atomic_read(&e->count))
	return -EBUSY;
	remove_proc_entry(e->name, dev->bus->procdir);
	dev->procent = NULL;
	}
	return 0;
	}

	#if 0
	int pci_proc_attach_bus(struct pci_bus* bus)
	{
	struct proc_dir_entry *de = bus->procdir;

	if (!proc_initialized)
	return -EACCES;

	if (!de) {
	char name[16];
	sprintf(name, "%02x", bus->number);
	de = bus->procdir = proc_mkdir(name, proc_bus_pci_dir);
	if (!de)
	return -ENOMEM;
	}
	return 0;
	}
	#endif /* 0 */

	int pci_proc_detach_bus(struct pci_bus* bus)
	{
	struct proc_dir_entry *de = bus->procdir;
	if (de)
	remove_proc_entry(de->name, proc_bus_pci_dir);
	return 0;
	}

	static int proc_bus_pci_dev_open(struct inode inode, struct file file)
	{
	return seq_open(file, &proc_bus_pci_devices_op);
	}
	static struct file_operations proc_bus_pci_dev_operations = {
	.open = proc_bus_pci_dev_open,
	.read = seq_read,
	.llseek = seq_lseek,
	.release = seq_release,
	};

	static int __init pci_proc_init(void)
	{
	struct proc_dir_entry *entry;
	struct pci_dev *dev = NULL;
	proc_bus_pci_dir = proc_mkdir("pci", proc_bus);
	entry = create_proc_entry("devices", 0, proc_bus_pci_dir);
	if (entry)
	entry->proc_fops = &proc_bus_pci_dev_operations;
	proc_initialized = 1;
	while ((dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL) {
	pci_proc_attach_device(dev);
	}
	return 0;
	}

	__initcall(pci_proc_init);

	#ifdef CONFIG_HOTPLUG
	EXPORT_SYMBOL(pci_proc_attach_device);
	EXPORT_SYMBOL(pci_proc_detach_bus);
	#endif