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/*
* PCI HotPlug Controller Core
*
* Copyright (c) 2001 Greg Kroah-Hartman (greg@kroah.com)
* Copyright (c) 2001 IBM Corp.
*
* All rights reserved.
*
* 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, GOOD TITLE or
* NON INFRINGEMENT. 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.
*
* Send feedback to <greg@kroah.com>
*
*/
#include <linux/config.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/list.h>
#include <linux/pagemap.h>
#include <linux/slab.h>
#include <linux/smp_lock.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <asm/uaccess.h>
#include "pci_hotplug.h"
#if !defined(CONFIG_HOTPLUG_PCI_MODULE)
#define MY_NAME "pci_hotplug"
#else
#define MY_NAME THIS_MODULE->name
#endif
#define dbg(fmt, arg...) do { if (debug) printk(KERN_DEBUG "%s: "__FUNCTION__": " fmt , MY_NAME , ## arg); } while (0)
#define err(format, arg...) printk(KERN_ERR "%s: " format , MY_NAME , ## arg)
#define info(format, arg...) printk(KERN_INFO "%s: " format , MY_NAME , ## arg)
#define warn(format, arg...) printk(KERN_WARNING "%s: " format , MY_NAME , ## arg)
/* local variables */
static int debug;
#define DRIVER_VERSION "0.3"
#define DRIVER_AUTHOR "Greg Kroah-Hartman <greg@kroah.com>"
#define DRIVER_DESC "PCI Hot Plug PCI Core"
//////////////////////////////////////////////////////////////////
/* Random magic number */
#define PCIHPFS_MAGIC 0x52454541
struct hotplug_slot_core {
struct dentry *dir_dentry;
struct dentry *power_dentry;
struct dentry *attention_dentry;
struct dentry *latch_dentry;
struct dentry *adapter_dentry;
struct dentry *test_dentry;
};
static struct super_operations pcihpfs_ops;
static struct address_space_operations pcihpfs_aops;
static struct file_operations pcihpfs_dir_operations;
static struct file_operations default_file_operations;
static struct inode_operations pcihpfs_dir_inode_operations;
static struct vfsmount *pcihpfs_mount; /* one of the mounts of our fs for reference counting */
static int pcihpfs_mount_count; /* times we have mounted our fs */
static spinlock_t mount_lock; /* protects our mount_count */
static spinlock_t list_lock;
LIST_HEAD(pci_hotplug_slot_list);
static int pcihpfs_statfs (struct super_block *sb, struct statfs *buf)
{
buf->f_type = PCIHPFS_MAGIC;
buf->f_bsize = PAGE_CACHE_SIZE;
buf->f_namelen = 255;
return 0;
}
static struct dentry *pcihpfs_lookup (struct inode *dir, struct dentry *dentry)
{
d_add(dentry, NULL);
return NULL;
}
static struct inode *pcihpfs_get_inode (struct super_block *sb, int mode, int dev)
{
struct inode *inode = new_inode(sb);
if (inode) {
inode->i_mode = mode;
inode->i_uid = current->fsuid;
inode->i_gid = current->fsgid;
inode->i_blksize = PAGE_CACHE_SIZE;
inode->i_blocks = 0;
inode->i_rdev = NODEV;
inode->i_mapping->a_ops = &pcihpfs_aops;
inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
switch (mode & S_IFMT) {
default:
init_special_inode(inode, mode, dev);
break;
case S_IFREG:
inode->i_fop = &default_file_operations;
break;
case S_IFDIR:
inode->i_op = &pcihpfs_dir_inode_operations;
inode->i_fop = &pcihpfs_dir_operations;
break;
}
}
return inode;
}
static int pcihpfs_mknod (struct inode *dir, struct dentry *dentry, int mode, int dev)
{
struct inode *inode = pcihpfs_get_inode(dir->i_sb, mode, dev);
int error = -ENOSPC;
if (inode) {
d_instantiate(dentry, inode);
dget(dentry);
error = 0;
}
return error;
}
static int pcihpfs_mkdir (struct inode *dir, struct dentry *dentry, int mode)
{
return pcihpfs_mknod (dir, dentry, mode | S_IFDIR, 0);
}
static int pcihpfs_create (struct inode *dir, struct dentry *dentry, int mode)
{
return pcihpfs_mknod (dir, dentry, mode | S_IFREG, 0);
}
static int pcihpfs_link (struct dentry *old_dentry, struct inode *dir,
struct dentry *dentry)
{
struct inode *inode = old_dentry->d_inode;
if(S_ISDIR(inode->i_mode))
return -EPERM;
inode->i_nlink++;
atomic_inc(&inode->i_count);
dget(dentry);
d_instantiate(dentry, inode);
return 0;
}
static inline int pcihpfs_positive (struct dentry *dentry)
{
return dentry->d_inode && !d_unhashed(dentry);
}
static int pcihpfs_empty (struct dentry *dentry)
{
struct list_head *list;
spin_lock(&dcache_lock);
list_for_each(list, &dentry->d_subdirs) {
struct dentry *de = list_entry(list, struct dentry, d_child);
if (pcihpfs_positive(de)) {
spin_unlock(&dcache_lock);
return 0;
}
}
spin_unlock(&dcache_lock);
return 1;
}
static int pcihpfs_unlink (struct inode *dir, struct dentry *dentry)
{
int error = -ENOTEMPTY;
if (pcihpfs_empty(dentry)) {
struct inode *inode = dentry->d_inode;
inode->i_nlink--;
dput(dentry);
error = 0;
}
return error;
}
static int pcihpfs_rename (struct inode *old_dir, struct dentry *old_dentry,
struct inode *new_dir, struct dentry *new_dentry)
{
int error = -ENOTEMPTY;
if (pcihpfs_empty(new_dentry)) {
struct inode *inode = new_dentry->d_inode;
if (inode) {
inode->i_nlink--;
dput(new_dentry);
}
error = 0;
}
return error;
}
#define pcihpfs_rmdir pcihpfs_unlink
/* default file operations */
static ssize_t default_read_file (struct file *file, char *buf, size_t count, loff_t *ppos)
{
dbg ("\n");
return 0;
}
static ssize_t default_write_file (struct file *file, const char *buf, size_t count, loff_t *ppos)
{
dbg ("\n");
return count;
}
static loff_t default_file_lseek (struct file *file, loff_t offset, int orig)
{
loff_t retval = -EINVAL;
switch(orig) {
case 0:
if (offset > 0) {
file->f_pos = offset;
retval = file->f_pos;
}
break;
case 1:
if ((offset + file->f_pos) > 0) {
file->f_pos += offset;
retval = file->f_pos;
}
break;
default:
break;
}
return retval;
}
static int default_open (struct inode *inode, struct file *filp)
{
if (inode->u.generic_ip)
filp->private_data = inode->u.generic_ip;
return 0;
}
static int default_sync_file (struct file *file, struct dentry *dentry, int datasync)
{
return 0;
}
static struct address_space_operations pcihpfs_aops = {
};
static struct file_operations pcihpfs_dir_operations = {
read: generic_read_dir,
readdir: dcache_readdir,
fsync: default_sync_file,
};
static struct file_operations default_file_operations = {
read: default_read_file,
write: default_write_file,
open: default_open,
llseek: default_file_lseek,
fsync: default_sync_file,
mmap: generic_file_mmap,
};
/* file ops for the "power" files */
static ssize_t power_read_file (struct file *file, char *buf, size_t count, loff_t *offset);
static ssize_t power_write_file (struct file *file, const char *buf, size_t count, loff_t *ppos);
static struct file_operations power_file_operations = {
read: power_read_file,
write: power_write_file,
open: default_open,
llseek: default_file_lseek,
fsync: default_sync_file,
mmap: generic_file_mmap,
};
/* file ops for the "attention" files */
static ssize_t attention_read_file (struct file *file, char *buf, size_t count, loff_t *offset);
static ssize_t attention_write_file (struct file *file, const char *buf, size_t count, loff_t *ppos);
static struct file_operations attention_file_operations = {
read: attention_read_file,
write: attention_write_file,
open: default_open,
llseek: default_file_lseek,
fsync: default_sync_file,
mmap: generic_file_mmap,
};
/* file ops for the "latch" files */
static ssize_t latch_read_file (struct file *file, char *buf, size_t count, loff_t *offset);
static struct file_operations latch_file_operations = {
read: latch_read_file,
write: default_write_file,
open: default_open,
llseek: default_file_lseek,
fsync: default_sync_file,
mmap: generic_file_mmap,
};
/* file ops for the "presence" files */
static ssize_t presence_read_file (struct file *file, char *buf, size_t count, loff_t *offset);
static struct file_operations presence_file_operations = {
read: presence_read_file,
write: default_write_file,
open: default_open,
llseek: default_file_lseek,
fsync: default_sync_file,
mmap: generic_file_mmap,
};
/* file ops for the "test" files */
static ssize_t test_write_file (struct file *file, const char *buf, size_t count, loff_t *ppos);
static struct file_operations test_file_operations = {
read: default_read_file,
write: test_write_file,
open: default_open,
llseek: default_file_lseek,
fsync: default_sync_file,
mmap: generic_file_mmap,
};
static struct inode_operations pcihpfs_dir_inode_operations = {
create: pcihpfs_create,
lookup: pcihpfs_lookup,
link: pcihpfs_link,
unlink: pcihpfs_unlink,
mkdir: pcihpfs_mkdir,
rmdir: pcihpfs_rmdir,
mknod: pcihpfs_mknod,
rename: pcihpfs_rename,
};
static struct super_operations pcihpfs_ops = {
statfs: pcihpfs_statfs,
put_inode: force_delete,
};
static struct super_block *pcihpfs_read_super (struct super_block *sb, void *data, int silent)
{
struct inode *inode;
struct dentry *root;
sb->s_blocksize = PAGE_CACHE_SIZE;
sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
sb->s_magic = PCIHPFS_MAGIC;
sb->s_op = &pcihpfs_ops;
inode = pcihpfs_get_inode(sb, S_IFDIR | 0755, 0);
if (!inode) {
dbg("%s: could not get inode!\n",__FUNCTION__);
return NULL;
}
root = d_alloc_root(inode);
if (!root) {
dbg("%s: could not get root dentry!\n",__FUNCTION__);
iput(inode);
return NULL;
}
sb->s_root = root;
return sb;
}
static DECLARE_FSTYPE(pcihpfs_fs_type, "pcihpfs", pcihpfs_read_super, FS_SINGLE | FS_LITTER);
static int get_mount (void)
{
struct vfsmount *mnt;
spin_lock (&mount_lock);
if (pcihpfs_mount) {
mntget(pcihpfs_mount);
++pcihpfs_mount_count;
spin_unlock (&mount_lock);
goto go_ahead;
}
spin_unlock (&mount_lock);
mnt = kern_mount (&pcihpfs_fs_type);
if (IS_ERR(mnt)) {
err ("could not mount the fs...erroring out!\n");
return -ENODEV;
}
spin_lock (&mount_lock);
if (!pcihpfs_mount) {
pcihpfs_mount = mnt;
++pcihpfs_mount_count;
spin_unlock (&mount_lock);
goto go_ahead;
}
mntget(pcihpfs_mount);
++pcihpfs_mount_count;
spin_unlock (&mount_lock);
mntput(mnt);
go_ahead:
dbg("pcihpfs_mount_count = %d\n", pcihpfs_mount_count);
return 0;
}
static void remove_mount (void)
{
struct vfsmount *mnt;
spin_lock (&mount_lock);
mnt = pcihpfs_mount;
--pcihpfs_mount_count;
if (!pcihpfs_mount_count)
pcihpfs_mount = NULL;
spin_unlock (&mount_lock);
mntput(mnt);
dbg("pcihpfs_mount_count = %d\n", pcihpfs_mount_count);
}
/**
* pcihpfs_create_by_name - create a file, given a name
* @name: name of file
* @mode: type of file
* @parent: dentry of directory to create it in
* @dentry: resulting dentry of file
*
* There is a bit of overhead in creating a file - basically, we
* have to hash the name of the file, then look it up. This will
* prevent files of the same name.
* We then call the proper vfs_ function to take care of all the
* file creation details.
* This function handles both regular files and directories.
*/
static int pcihpfs_create_by_name (const char *name, mode_t mode,
struct dentry *parent, struct dentry **dentry)
{
struct dentry *d = NULL;
struct qstr qstr;
int error;
/* If the parent is not specified, we create it in the root.
* We need the root dentry to do this, which is in the super
* block. A pointer to that is in the struct vfsmount that we
* have around.
*/
if (!parent ) {
if (pcihpfs_mount && pcihpfs_mount->mnt_sb) {
parent = pcihpfs_mount->mnt_sb->s_root;
}
}
if (!parent) {
dbg("Ah! can not find a parent!\n");
return -EFAULT;
}
*dentry = NULL;
qstr.name = name;
qstr.len = strlen(name);
qstr.hash = full_name_hash(name,qstr.len);
parent = dget(parent);
down(&parent->d_inode->i_sem);
d = lookup_hash(&qstr,parent);
error = PTR_ERR(d);
if (!IS_ERR(d)) {
switch(mode & S_IFMT) {
case 0:
case S_IFREG:
error = vfs_create(parent->d_inode,d,mode);
break;
case S_IFDIR:
error = vfs_mkdir(parent->d_inode,d,mode);
break;
default:
err("cannot create special files\n");
}
*dentry = d;
}
up(&parent->d_inode->i_sem);
dput(parent);
return error;
}
static struct dentry *fs_create_file (const char *name, mode_t mode,
struct dentry *parent, void *data,
struct file_operations *fops)
{
struct dentry *dentry;
int error;
dbg("creating file '%s'\n",name);
error = pcihpfs_create_by_name(name,mode,parent,&dentry);
if (error) {
dentry = NULL;
} else {
if (dentry->d_inode) {
if (data)
dentry->d_inode->u.generic_ip = data;
if (fops)
dentry->d_inode->i_fop = fops;
}
}
return dentry;
}
static void fs_remove_file (struct dentry *dentry)
{
struct dentry *parent = dentry->d_parent;
if (!parent || !parent->d_inode)
return;
down(&parent->d_inode->i_sem);
if (pcihpfs_positive(dentry)) {
if (dentry->d_inode) {
if (S_ISDIR(dentry->d_inode->i_mode))
vfs_rmdir(parent->d_inode,dentry);
else
vfs_unlink(parent->d_inode,dentry);
}
dput(dentry);
}
up(&parent->d_inode->i_sem);
}
#define GET_STATUS(name) \
static int get_##name##_status (struct hotplug_slot *slot, u8 *value) \
{ \
struct hotplug_slot_ops *ops = slot->ops; \
int retval = 0; \
if (ops->owner) \
__MOD_INC_USE_COUNT(ops->owner); \
if (ops->get_##name##_status) \
retval = ops->get_##name##_status (slot, value); \
else \
*value = slot->info->name##_status; \
if (ops->owner) \
__MOD_DEC_USE_COUNT(ops->owner); \
return retval; \
}
GET_STATUS(power)
GET_STATUS(attention)
GET_STATUS(latch)
GET_STATUS(adapter)
static ssize_t power_read_file (struct file *file, char *buf, size_t count, loff_t *offset)
{
struct hotplug_slot *slot = file->private_data;
unsigned char *page;
int retval;
int len;
u8 value;
dbg(" count = %d, offset = %lld\n", count, *offset);
if (*offset < 0)
return -EINVAL;
if (count <= 0)
return 0;
if (*offset != 0)
return 0;
if (slot == NULL) {
dbg("slot == NULL???\n");
return -ENODEV;
}
page = (unsigned char *)__get_free_page(GFP_KERNEL);
if (!page)
return -ENOMEM;
retval = get_power_status (slot, &value);
if (retval)
goto exit;
len = sprintf (page, "%d\n", value);
if (copy_to_user (buf, page, len)) {
retval = -EFAULT;
goto exit;
}
*offset += len;
retval = len;
exit:
free_page((unsigned long)page);
return retval;
}
static ssize_t power_write_file (struct file *file, const char *ubuff, size_t count, loff_t *offset)
{
struct hotplug_slot *slot = file->private_data;
char *buff;
unsigned long lpower;
u8 power;
int retval = 0;
if (*offset < 0)
return -EINVAL;
if (count <= 0)
return 0;
if (*offset != 0)
return 0;
if (slot == NULL) {
dbg("slot == NULL???\n");
return -ENODEV;
}
buff = kmalloc (count + 1, GFP_KERNEL);
if (!buff)
return -ENOMEM;
memset (buff, 0x00, count + 1);
if (copy_from_user ((void *)buff, (void *)ubuff, count)) {
retval = -EFAULT;
goto exit;
}
lpower = simple_strtoul (buff, NULL, 10);
power = (u8)(lpower & 0xff);
dbg ("power = %d\n", power);
switch (power) {
case 0:
if (!slot->ops->disable_slot)
break;
if (slot->ops->owner)
__MOD_INC_USE_COUNT(slot->ops->owner);
retval = slot->ops->disable_slot(slot);
if (slot->ops->owner)
__MOD_DEC_USE_COUNT(slot->ops->owner);
break;
case 1:
if (!slot->ops->enable_slot)
break;
if (slot->ops->owner)
__MOD_INC_USE_COUNT(slot->ops->owner);
retval = slot->ops->enable_slot(slot);
if (slot->ops->owner)
__MOD_DEC_USE_COUNT(slot->ops->owner);
break;
default:
err ("Illegal value specified for power\n");
retval = -EFAULT;
}
exit:
kfree (buff);
if (retval)
return retval;
return count;
}
static ssize_t attention_read_file (struct file *file, char *buf, size_t count, loff_t *offset)
{
struct hotplug_slot *slot = file->private_data;
unsigned char *page;
int retval;
int len;
u8 value;
dbg("count = %d, offset = %lld\n", count, *offset);
if (*offset < 0)
return -EINVAL;
if (count <= 0)
return 0;
if (*offset != 0)
return 0;
if (slot == NULL) {
dbg("slot == NULL???\n");
return -ENODEV;
}
page = (unsigned char *)__get_free_page(GFP_KERNEL);
if (!page)
return -ENOMEM;
retval = get_attention_status (slot, &value);
if (retval)
goto exit;
len = sprintf (page, "%d\n", value);
if (copy_to_user (buf, page, len)) {
retval = -EFAULT;
goto exit;
}
*offset += len;
retval = len;
exit:
free_page((unsigned long)page);
return retval;
}
static ssize_t attention_write_file (struct file *file, const char *ubuff, size_t count, loff_t *offset)
{
struct hotplug_slot *slot = file->private_data;
char *buff;
unsigned long lattention;
u8 attention;
int retval = 0;
if (*offset < 0)
return -EINVAL;
if (count <= 0)
return 0;
if (*offset != 0)
return 0;
if (slot == NULL) {
dbg("slot == NULL???\n");
return -ENODEV;
}
buff = kmalloc (count + 1, GFP_KERNEL);
if (!buff)
return -ENOMEM;
memset (buff, 0x00, count + 1);
if (copy_from_user ((void *)buff, (void *)ubuff, count)) {
retval = -EFAULT;
goto exit;
}
lattention = simple_strtoul (buff, NULL, 10);
attention = (u8)(lattention & 0xff);
dbg (" - attention = %d\n", attention);
if (slot->ops->set_attention_status) {
if (slot->ops->owner)
__MOD_INC_USE_COUNT(slot->ops->owner);
retval = slot->ops->set_attention_status(slot, attention);
if (slot->ops->owner)
__MOD_DEC_USE_COUNT(slot->ops->owner);
}
exit:
kfree (buff);
if (retval)
return retval;
return count;
}
static ssize_t latch_read_file (struct file *file, char *buf, size_t count, loff_t *offset)
{
struct hotplug_slot *slot = file->private_data;
unsigned char *page;
int retval;
int len;
u8 value;
dbg("count = %d, offset = %lld\n", count, *offset);
if (*offset < 0)
return -EINVAL;
if (count <= 0)
return 0;
if (*offset != 0)
return 0;
if (slot == NULL) {
dbg("slot == NULL???\n");
return -ENODEV;
}
page = (unsigned char *)__get_free_page(GFP_KERNEL);
if (!page)
return -ENOMEM;
retval = get_latch_status (slot, &value);
if (retval)
goto exit;
len = sprintf (page, "%d\n", value);
if (copy_to_user (buf, page, len)) {
retval = -EFAULT;
goto exit;
}
*offset += len;
retval = len;
exit:
free_page((unsigned long)page);
return retval;
}
static ssize_t presence_read_file (struct file *file, char *buf, size_t count, loff_t *offset)
{
struct hotplug_slot *slot = file->private_data;
unsigned char *page;
int retval;
int len;
u8 value;
dbg("count = %d, offset = %lld\n", count, *offset);
if (*offset < 0)
return -EINVAL;
if (count <= 0)
return 0;
if (*offset != 0)
return 0;
if (slot == NULL) {
dbg("slot == NULL???\n");
return -ENODEV;
}
page = (unsigned char *)__get_free_page(GFP_KERNEL);
if (!page)
return -ENOMEM;
retval = get_adapter_status (slot, &value);
if (retval)
goto exit;
len = sprintf (page, "%d\n", value);
if (copy_to_user (buf, page, len)) {
retval = -EFAULT;
goto exit;
}
*offset += len;
retval = len;
exit:
free_page((unsigned long)page);
return retval;
}
static ssize_t test_write_file (struct file *file, const char *ubuff, size_t count, loff_t *offset)
{
struct hotplug_slot *slot = file->private_data;
char *buff;
unsigned long ltest;
u32 test;
int retval = 0;
if (*offset < 0)
return -EINVAL;
if (count <= 0)
return 0;
if (*offset != 0)
return 0;
if (slot == NULL) {
dbg("slot == NULL???\n");
return -ENODEV;
}
buff = kmalloc (count + 1, GFP_KERNEL);
if (!buff)
return -ENOMEM;
memset (buff, 0x00, count + 1);
if (copy_from_user ((void *)buff, (void *)ubuff, count)) {
retval = -EFAULT;
goto exit;
}
ltest = simple_strtoul (buff, NULL, 10);
test = (u32)(ltest & 0xffffffff);
dbg ("test = %d\n", test);
if (slot->ops->hardware_test) {
if (slot->ops->owner)
__MOD_INC_USE_COUNT(slot->ops->owner);
retval = slot->ops->hardware_test(slot, test);
if (slot->ops->owner)
__MOD_DEC_USE_COUNT(slot->ops->owner);
}
exit:
kfree (buff);
if (retval)
return retval;
return count;
}
static int fs_add_slot (struct hotplug_slot *slot)
{
struct hotplug_slot_core *core = slot->core_priv;
int result;
result = get_mount();
if (result)
return result;
core->dir_dentry = fs_create_file (slot->name,
S_IFDIR | S_IXUGO | S_IRUGO,
NULL, NULL, NULL);
if (core->dir_dentry != NULL) {
core->power_dentry = fs_create_file ("power",
S_IFREG | S_IRUGO | S_IWUSR,
core->dir_dentry, slot,
&power_file_operations);
core->attention_dentry = fs_create_file ("attention",
S_IFREG | S_IRUGO | S_IWUSR,
core->dir_dentry, slot,
&attention_file_operations);
core->latch_dentry = fs_create_file ("latch",
S_IFREG | S_IRUGO,
core->dir_dentry, slot,
&latch_file_operations);
core->adapter_dentry = fs_create_file ("adapter",
S_IFREG | S_IRUGO,
core->dir_dentry, slot,
&presence_file_operations);
core->test_dentry = fs_create_file ("test",
S_IFREG | S_IRUGO | S_IWUSR,
core->dir_dentry, slot,
&test_file_operations);
}
return 0;
}
static void fs_remove_slot (struct hotplug_slot *slot)
{
struct hotplug_slot_core *core = slot->core_priv;
if (core->dir_dentry) {
if (core->power_dentry)
fs_remove_file (core->power_dentry);
if (core->attention_dentry)
fs_remove_file (core->attention_dentry);
if (core->latch_dentry)
fs_remove_file (core->latch_dentry);
if (core->adapter_dentry)
fs_remove_file (core->adapter_dentry);
if (core->test_dentry)
fs_remove_file (core->test_dentry);
fs_remove_file (core->dir_dentry);
}
remove_mount();
}
static struct hotplug_slot *get_slot_from_name (const char *name)
{
struct hotplug_slot *slot;
struct list_head *tmp;
list_for_each (tmp, &pci_hotplug_slot_list) {
slot = list_entry (tmp, struct hotplug_slot, slot_list);
if (strcmp(slot->name, name) == 0)
return slot;
}
return NULL;
}
/**
* pci_hp_register - register a hotplug_slot with the PCI hotplug subsystem
* @slot: pointer to the &struct hotplug_slot to register
*
* Registers a hotplug slot with the pci hotplug subsystem, which will allow
* userspace interaction to the slot.
*
* Returns 0 if successful, anything else for an error.
*/
int pci_hp_register (struct hotplug_slot *slot)
{
struct hotplug_slot_core *core;
int result;
if (slot == NULL)
return -ENODEV;
if ((slot->info == NULL) || (slot->ops == NULL))
return -EFAULT;
core = kmalloc (sizeof (struct hotplug_slot_core), GFP_KERNEL);
if (!core)
return -ENOMEM;
/* make sure we have not already registered this slot */
spin_lock (&list_lock);
if (get_slot_from_name (slot->name) != NULL) {
spin_unlock (&list_lock);
kfree (core);
return -EFAULT;
}
slot->core_priv = core;
list_add (&slot->slot_list, &pci_hotplug_slot_list);
spin_unlock (&list_lock);
result = fs_add_slot (slot);
dbg ("Added slot %s to the list\n", slot->name);
return result;
}
/**
* pci_hp_deregister - deregister a hotplug_slot with the PCI hotplug subsystem
* @slot: pointer to the &struct hotplug_slot to deregister
*
* The @slot must have been registered with the pci hotplug subsystem
* previously with a call to pci_hp_register().
*
* Returns 0 if successful, anything else for an error.
*/
int pci_hp_deregister (struct hotplug_slot *slot)
{
struct hotplug_slot *temp;
if (slot == NULL)
return -ENODEV;
/* make sure we have this slot in our list before trying to delete it */
spin_lock (&list_lock);
temp = get_slot_from_name (slot->name);
if (temp != slot) {
spin_unlock (&list_lock);
return -ENODEV;
}
list_del (&slot->slot_list);
spin_unlock (&list_lock);
fs_remove_slot (slot);
kfree(slot->core_priv);
dbg ("Removed slot %s from the list\n", slot->name);
return 0;
}
/**
* pci_hp_change_slot_info - changes the slot's information structure in the core
* @name: the name of the slot whose info has changed
* @info: pointer to the info copy into the slot's info structure
*
* A slot with @name must have been registered with the pci
* hotplug subsystem previously with a call to pci_hp_register().
*
* Returns 0 if successful, anything else for an error.
*/
int pci_hp_change_slot_info (const char *name, struct hotplug_slot_info *info)
{
struct hotplug_slot *temp;
if (info == NULL)
return -ENODEV;
spin_lock (&list_lock);
temp = get_slot_from_name (name);
if (temp == NULL) {
spin_unlock (&list_lock);
return -ENODEV;
}
memcpy (temp->info, info, sizeof (struct hotplug_slot_info));
spin_unlock (&list_lock);
return 0;
}
static int __init pci_hotplug_init (void)
{
int result;
spin_lock_init(&mount_lock);
spin_lock_init(&list_lock);
dbg("registering filesystem.\n");
result = register_filesystem(&pcihpfs_fs_type);
if (result) {
err("register_filesystem failed with %d\n", result);
goto exit;
}
info (DRIVER_DESC " version: " DRIVER_VERSION "\n");
exit:
return result;
}
static void __exit pci_hotplug_exit (void)
{
unregister_filesystem(&pcihpfs_fs_type);
}
module_init(pci_hotplug_init);
module_exit(pci_hotplug_exit);
MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");
MODULE_PARM(debug, "i");
MODULE_PARM_DESC(debug, "Debugging mode enabled or not");
EXPORT_SYMBOL_GPL(pci_hp_register);
EXPORT_SYMBOL_GPL(pci_hp_deregister);
EXPORT_SYMBOL_GPL(pci_hp_change_slot_info);
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