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linux/sound/core/info.c
Paulo Marques 543537bd92 [PATCH] create a kstrdup library function 
This patch creates a new kstrdup library function and changes the "local"
implementations in several places to use this function.

Most of the changes come from the sound and net subsystems.  The sound part
had already been acknowledged by Takashi Iwai and the net part by David S.
Miller.

I left UML alone for now because I would need more time to read the code
carefully before making changes there.

Signed-off-by: Paulo Marques <pmarques@grupopie.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-06-23 09:45:18 -07:00

991 lines
23 KiB
C
Raw Blame History

/*
* Information interface for ALSA driver
* Copyright (c) by Jaroslav Kysela <perex@suse.cz>
*
*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#include <sound/driver.h>
#include <linux/init.h>
#include <linux/vmalloc.h>
#include <linux/time.h>
#include <linux/smp_lock.h>
#include <linux/string.h>
#include <sound/core.h>
#include <sound/minors.h>
#include <sound/info.h>
#include <sound/version.h>
#include <linux/proc_fs.h>
#include <linux/devfs_fs_kernel.h>
#include <stdarg.h>
/*
*
*/
int snd_info_check_reserved_words(const char *str)
{
static char *reserved[] =
{
"version",
"meminfo",
"memdebug",
"detect",
"devices",
"oss",
"cards",
"timers",
"synth",
"pcm",
"seq",
NULL
};
char **xstr = reserved;
while (*xstr) {
if (!strcmp(*xstr, str))
return 0;
xstr++;
}
if (!strncmp(str, "card", 4))
return 0;
return 1;
}
#ifdef CONFIG_PROC_FS
static DECLARE_MUTEX(info_mutex);
typedef struct _snd_info_private_data {
snd_info_buffer_t *rbuffer;
snd_info_buffer_t *wbuffer;
snd_info_entry_t *entry;
void *file_private_data;
} snd_info_private_data_t;
static int snd_info_version_init(void);
static int snd_info_version_done(void);
/**
* snd_iprintf - printf on the procfs buffer
* @buffer: the procfs buffer
* @fmt: the printf format
*
* Outputs the string on the procfs buffer just like printf().
*
* Returns the size of output string.
*/
int snd_iprintf(snd_info_buffer_t * buffer, char *fmt,...)
{
va_list args;
int len, res;
if (buffer->stop || buffer->error)
return 0;
len = buffer->len - buffer->size;
va_start(args, fmt);
res = vsnprintf(buffer->curr, len, fmt, args);
va_end(args);
if (res >= len) {
buffer->stop = 1;
return 0;
}
buffer->curr += res;
buffer->size += res;
return res;
}
/*
*/
static struct proc_dir_entry *snd_proc_root = NULL;
snd_info_entry_t *snd_seq_root = NULL;
#ifdef CONFIG_SND_OSSEMUL
snd_info_entry_t *snd_oss_root = NULL;
#endif
static inline void snd_info_entry_prepare(struct proc_dir_entry *de)
{
de->owner = THIS_MODULE;
}
static void snd_remove_proc_entry(struct proc_dir_entry *parent,
struct proc_dir_entry *de)
{
if (de)
remove_proc_entry(de->name, parent);
}
static loff_t snd_info_entry_llseek(struct file *file, loff_t offset, int orig)
{
snd_info_private_data_t *data;
struct snd_info_entry *entry;
loff_t ret;
data = file->private_data;
entry = data->entry;
lock_kernel();
switch (entry->content) {
case SNDRV_INFO_CONTENT_TEXT:
switch (orig) {
case 0: /* SEEK_SET */
file->f_pos = offset;
ret = file->f_pos;
goto out;
case 1: /* SEEK_CUR */
file->f_pos += offset;
ret = file->f_pos;
goto out;
case 2: /* SEEK_END */
default:
ret = -EINVAL;
goto out;
}
break;
case SNDRV_INFO_CONTENT_DATA:
if (entry->c.ops->llseek) {
ret = entry->c.ops->llseek(entry,
data->file_private_data,
file, offset, orig);
goto out;
}
break;
}
ret = -ENXIO;
out:
unlock_kernel();
return ret;
}
static ssize_t snd_info_entry_read(struct file *file, char __user *buffer,
size_t count, loff_t * offset)
{
snd_info_private_data_t *data;
struct snd_info_entry *entry;
snd_info_buffer_t *buf;
size_t size = 0;
loff_t pos;
data = file->private_data;
snd_assert(data != NULL, return -ENXIO);
pos = *offset;
if (pos < 0 || (long) pos != pos || (ssize_t) count < 0)
return -EIO;
if ((unsigned long) pos + (unsigned long) count < (unsigned long) pos)
return -EIO;
entry = data->entry;
switch (entry->content) {
case SNDRV_INFO_CONTENT_TEXT:
buf = data->rbuffer;
if (buf == NULL)
return -EIO;
if (pos >= buf->size)
return 0;
size = buf->size - pos;
size = min(count, size);
if (copy_to_user(buffer, buf->buffer + pos, size))
return -EFAULT;
break;
case SNDRV_INFO_CONTENT_DATA:
if (entry->c.ops->read)
size = entry->c.ops->read(entry,
data->file_private_data,
file, buffer, count, pos);
break;
}
if ((ssize_t) size > 0)
*offset = pos + size;
return size;
}
static ssize_t snd_info_entry_write(struct file *file, const char __user *buffer,
size_t count, loff_t * offset)
{
snd_info_private_data_t *data;
struct snd_info_entry *entry;
snd_info_buffer_t *buf;
size_t size = 0;
loff_t pos;
data = file->private_data;
snd_assert(data != NULL, return -ENXIO);
entry = data->entry;
pos = *offset;
if (pos < 0 || (long) pos != pos || (ssize_t) count < 0)
return -EIO;
if ((unsigned long) pos + (unsigned long) count < (unsigned long) pos)
return -EIO;
switch (entry->content) {
case SNDRV_INFO_CONTENT_TEXT:
buf = data->wbuffer;
if (buf == NULL)
return -EIO;
if (pos >= buf->len)
return -ENOMEM;
size = buf->len - pos;
size = min(count, size);
if (copy_from_user(buf->buffer + pos, buffer, size))
return -EFAULT;
if ((long)buf->size < pos + size)
buf->size = pos + size;
break;
case SNDRV_INFO_CONTENT_DATA:
if (entry->c.ops->write)
size = entry->c.ops->write(entry,
data->file_private_data,
file, buffer, count, pos);
break;
}
if ((ssize_t) size > 0)
*offset = pos + size;
return size;
}
static int snd_info_entry_open(struct inode *inode, struct file *file)
{
snd_info_entry_t *entry;
snd_info_private_data_t *data;
snd_info_buffer_t *buffer;
struct proc_dir_entry *p;
int mode, err;
down(&info_mutex);
p = PDE(inode);
entry = p == NULL ? NULL : (snd_info_entry_t *)p->data;
if (entry == NULL || entry->disconnected) {
up(&info_mutex);
return -ENODEV;
}
if (!try_module_get(entry->module)) {
err = -EFAULT;
goto __error1;
}
mode = file->f_flags & O_ACCMODE;
if (mode == O_RDONLY || mode == O_RDWR) {
if ((entry->content == SNDRV_INFO_CONTENT_TEXT &&
!entry->c.text.read_size) ||
(entry->content == SNDRV_INFO_CONTENT_DATA &&
entry->c.ops->read == NULL)) {
err = -ENODEV;
goto __error;
}
}
if (mode == O_WRONLY || mode == O_RDWR) {
if ((entry->content == SNDRV_INFO_CONTENT_TEXT &&
!entry->c.text.write_size) ||
(entry->content == SNDRV_INFO_CONTENT_DATA &&
entry->c.ops->write == NULL)) {
err = -ENODEV;
goto __error;
}
}
data = kcalloc(1, sizeof(*data), GFP_KERNEL);
if (data == NULL) {
err = -ENOMEM;
goto __error;
}
data->entry = entry;
switch (entry->content) {
case SNDRV_INFO_CONTENT_TEXT:
if (mode == O_RDONLY || mode == O_RDWR) {
buffer = kcalloc(1, sizeof(*buffer), GFP_KERNEL);
if (buffer == NULL) {
kfree(data);
err = -ENOMEM;
goto __error;
}
buffer->len = (entry->c.text.read_size +
(PAGE_SIZE - 1)) & ~(PAGE_SIZE - 1);
buffer->buffer = vmalloc(buffer->len);
if (buffer->buffer == NULL) {
kfree(buffer);
kfree(data);
err = -ENOMEM;
goto __error;
}
buffer->curr = buffer->buffer;
data->rbuffer = buffer;
}
if (mode == O_WRONLY || mode == O_RDWR) {
buffer = kcalloc(1, sizeof(*buffer), GFP_KERNEL);
if (buffer == NULL) {
if (mode == O_RDWR) {
vfree(data->rbuffer->buffer);
kfree(data->rbuffer);
}
kfree(data);
err = -ENOMEM;
goto __error;
}
buffer->len = (entry->c.text.write_size +
(PAGE_SIZE - 1)) & ~(PAGE_SIZE - 1);
buffer->buffer = vmalloc(buffer->len);
if (buffer->buffer == NULL) {
if (mode == O_RDWR) {
vfree(data->rbuffer->buffer);
kfree(data->rbuffer);
}
kfree(buffer);
kfree(data);
err = -ENOMEM;
goto __error;
}
buffer->curr = buffer->buffer;
data->wbuffer = buffer;
}
break;
case SNDRV_INFO_CONTENT_DATA: /* data */
if (entry->c.ops->open) {
if ((err = entry->c.ops->open(entry, mode,
&data->file_private_data)) < 0) {
kfree(data);
goto __error;
}
}
break;
}
file->private_data = data;
up(&info_mutex);
if (entry->content == SNDRV_INFO_CONTENT_TEXT &&
(mode == O_RDONLY || mode == O_RDWR)) {
if (entry->c.text.read) {
down(&entry->access);
entry->c.text.read(entry, data->rbuffer);
up(&entry->access);
}
}
return 0;
__error:
module_put(entry->module);
__error1:
up(&info_mutex);
return err;
}
static int snd_info_entry_release(struct inode *inode, struct file *file)
{
snd_info_entry_t *entry;
snd_info_private_data_t *data;
int mode;
mode = file->f_flags & O_ACCMODE;
data = file->private_data;
entry = data->entry;
switch (entry->content) {
case SNDRV_INFO_CONTENT_TEXT:
if (mode == O_RDONLY || mode == O_RDWR) {
vfree(data->rbuffer->buffer);
kfree(data->rbuffer);
}
if (mode == O_WRONLY || mode == O_RDWR) {
if (entry->c.text.write) {
entry->c.text.write(entry, data->wbuffer);
if (data->wbuffer->error) {
snd_printk(KERN_WARNING "data write error to %s (%i)\n",
entry->name,
data->wbuffer->error);
}
}
vfree(data->wbuffer->buffer);
kfree(data->wbuffer);
}
break;
case SNDRV_INFO_CONTENT_DATA:
if (entry->c.ops->release)
entry->c.ops->release(entry, mode,
data->file_private_data);
break;
}
module_put(entry->module);
kfree(data);
return 0;
}
static unsigned int snd_info_entry_poll(struct file *file, poll_table * wait)
{
snd_info_private_data_t *data;
struct snd_info_entry *entry;
unsigned int mask;
data = file->private_data;
if (data == NULL)
return 0;
entry = data->entry;
mask = 0;
switch (entry->content) {
case SNDRV_INFO_CONTENT_DATA:
if (entry->c.ops->poll)
return entry->c.ops->poll(entry,
data->file_private_data,
file, wait);
if (entry->c.ops->read)
mask |= POLLIN | POLLRDNORM;
if (entry->c.ops->write)
mask |= POLLOUT | POLLWRNORM;
break;
}
return mask;
}
static inline int _snd_info_entry_ioctl(struct inode *inode, struct file *file,
unsigned int cmd, unsigned long arg)
{
snd_info_private_data_t *data;
struct snd_info_entry *entry;
data = file->private_data;
if (data == NULL)
return 0;
entry = data->entry;
switch (entry->content) {
case SNDRV_INFO_CONTENT_DATA:
if (entry->c.ops->ioctl)
return entry->c.ops->ioctl(entry,
data->file_private_data,
file, cmd, arg);
break;
}
return -ENOTTY;
}
/* FIXME: need to unlock BKL to allow preemption */
static int snd_info_entry_ioctl(struct inode *inode, struct file *file,
unsigned int cmd, unsigned long arg)
{
int err;
unlock_kernel();
err = _snd_info_entry_ioctl(inode, file, cmd, arg);
lock_kernel();
return err;
}
static int snd_info_entry_mmap(struct file *file, struct vm_area_struct *vma)
{
struct inode *inode = file->f_dentry->d_inode;
snd_info_private_data_t *data;
struct snd_info_entry *entry;
data = file->private_data;
if (data == NULL)
return 0;
entry = data->entry;
switch (entry->content) {
case SNDRV_INFO_CONTENT_DATA:
if (entry->c.ops->mmap)
return entry->c.ops->mmap(entry,
data->file_private_data,
inode, file, vma);
break;
}
return -ENXIO;
}
static struct file_operations snd_info_entry_operations =
{
.owner = THIS_MODULE,
.llseek = snd_info_entry_llseek,
.read = snd_info_entry_read,
.write = snd_info_entry_write,
.poll = snd_info_entry_poll,
.ioctl = snd_info_entry_ioctl,
.mmap = snd_info_entry_mmap,
.open = snd_info_entry_open,
.release = snd_info_entry_release,
};
/**
* snd_create_proc_entry - create a procfs entry
* @name: the name of the proc file
* @mode: the file permission bits, S_Ixxx
* @parent: the parent proc-directory entry
*
* Creates a new proc file entry with the given name and permission
* on the given directory.
*
* Returns the pointer of new instance or NULL on failure.
*/
static struct proc_dir_entry *snd_create_proc_entry(const char *name, mode_t mode,
struct proc_dir_entry *parent)
{
struct proc_dir_entry *p;
p = create_proc_entry(name, mode, parent);
if (p)
snd_info_entry_prepare(p);
return p;
}
int __init snd_info_init(void)
{
struct proc_dir_entry *p;
p = snd_create_proc_entry("asound", S_IFDIR | S_IRUGO | S_IXUGO, &proc_root);
if (p == NULL)
return -ENOMEM;
snd_proc_root = p;
#ifdef CONFIG_SND_OSSEMUL
{
snd_info_entry_t *entry;
if ((entry = snd_info_create_module_entry(THIS_MODULE, "oss", NULL)) == NULL)
return -ENOMEM;
entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
if (snd_info_register(entry) < 0) {
snd_info_free_entry(entry);
return -ENOMEM;
}
snd_oss_root = entry;
}
#endif
#if defined(CONFIG_SND_SEQUENCER) || defined(CONFIG_SND_SEQUENCER_MODULE)
{
snd_info_entry_t *entry;
if ((entry = snd_info_create_module_entry(THIS_MODULE, "seq", NULL)) == NULL)
return -ENOMEM;
entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
if (snd_info_register(entry) < 0) {
snd_info_free_entry(entry);
return -ENOMEM;
}
snd_seq_root = entry;
}
#endif
snd_info_version_init();
snd_memory_info_init();
snd_minor_info_init();
snd_minor_info_oss_init();
snd_card_info_init();
return 0;
}
int __exit snd_info_done(void)
{
snd_card_info_done();
snd_minor_info_oss_done();
snd_minor_info_done();
snd_memory_info_done();
snd_info_version_done();
if (snd_proc_root) {
#if defined(CONFIG_SND_SEQUENCER) || defined(CONFIG_SND_SEQUENCER_MODULE)
if (snd_seq_root)
snd_info_unregister(snd_seq_root);
#endif
#ifdef CONFIG_SND_OSSEMUL
if (snd_oss_root)
snd_info_unregister(snd_oss_root);
#endif
snd_remove_proc_entry(&proc_root, snd_proc_root);
}
return 0;
}
/*
*/
/*
* create a card proc file
* called from init.c
*/
int snd_info_card_create(snd_card_t * card)
{
char str[8];
snd_info_entry_t *entry;
snd_assert(card != NULL, return -ENXIO);
sprintf(str, "card%i", card->number);
if ((entry = snd_info_create_module_entry(card->module, str, NULL)) == NULL)
return -ENOMEM;
entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
if (snd_info_register(entry) < 0) {
snd_info_free_entry(entry);
return -ENOMEM;
}
card->proc_root = entry;
return 0;
}
/*
* register the card proc file
* called from init.c
*/
int snd_info_card_register(snd_card_t * card)
{
struct proc_dir_entry *p;
snd_assert(card != NULL, return -ENXIO);
if (!strcmp(card->id, card->proc_root->name))
return 0;
p = proc_symlink(card->id, snd_proc_root, card->proc_root->name);
if (p == NULL)
return -ENOMEM;
card->proc_root_link = p;
return 0;
}
/*
* de-register the card proc file
* called from init.c
*/
int snd_info_card_free(snd_card_t * card)
{
snd_assert(card != NULL, return -ENXIO);
if (card->proc_root_link) {
snd_remove_proc_entry(snd_proc_root, card->proc_root_link);
card->proc_root_link = NULL;
}
if (card->proc_root) {
snd_info_unregister(card->proc_root);
card->proc_root = NULL;
}
return 0;
}
/**
* snd_info_get_line - read one line from the procfs buffer
* @buffer: the procfs buffer
* @line: the buffer to store
* @len: the max. buffer size - 1
*
* Reads one line from the buffer and stores the string.
*
* Returns zero if successful, or 1 if error or EOF.
*/
int snd_info_get_line(snd_info_buffer_t * buffer, char *line, int len)
{
int c = -1;
if (len <= 0 || buffer->stop || buffer->error)
return 1;
while (--len > 0) {
c = *buffer->curr++;
if (c == '\n') {
if ((buffer->curr - buffer->buffer) >= (long)buffer->size) {
buffer->stop = 1;
}
break;
}
*line++ = c;
if ((buffer->curr - buffer->buffer) >= (long)buffer->size) {
buffer->stop = 1;
break;
}
}
while (c != '\n' && !buffer->stop) {
c = *buffer->curr++;
if ((buffer->curr - buffer->buffer) >= (long)buffer->size) {
buffer->stop = 1;
}
}
*line = '\0';
return 0;
}
/**
* snd_info_get_line - parse a string token
* @dest: the buffer to store the string token
* @src: the original string
* @len: the max. length of token - 1
*
* Parses the original string and copy a token to the given
* string buffer.
*
* Returns the updated pointer of the original string so that
* it can be used for the next call.
*/
char *snd_info_get_str(char *dest, char *src, int len)
{
int c;
while (*src == ' ' || *src == '\t')
src++;
if (*src == '"' || *src == '\'') {
c = *src++;
while (--len > 0 && *src && *src != c) {
*dest++ = *src++;
}
if (*src == c)
src++;
} else {
while (--len > 0 && *src && *src != ' ' && *src != '\t') {
*dest++ = *src++;
}
}
*dest = 0;
while (*src == ' ' || *src == '\t')
src++;
return src;
}
/**
* snd_info_create_entry - create an info entry
* @name: the proc file name
*
* Creates an info entry with the given file name and initializes as
* the default state.
*
* Usually called from other functions such as
* snd_info_create_card_entry().
*
* Returns the pointer of the new instance, or NULL on failure.
*/
static snd_info_entry_t *snd_info_create_entry(const char *name)
{
snd_info_entry_t *entry;
entry = kcalloc(1, sizeof(*entry), GFP_KERNEL);
if (entry == NULL)
return NULL;
entry->name = kstrdup(name, GFP_KERNEL);
if (entry->name == NULL) {
kfree(entry);
return NULL;
}
entry->mode = S_IFREG | S_IRUGO;
entry->content = SNDRV_INFO_CONTENT_TEXT;
init_MUTEX(&entry->access);
return entry;
}
/**
* snd_info_create_module_entry - create an info entry for the given module
* @module: the module pointer
* @name: the file name
* @parent: the parent directory
*
* Creates a new info entry and assigns it to the given module.
*
* Returns the pointer of the new instance, or NULL on failure.
*/
snd_info_entry_t *snd_info_create_module_entry(struct module * module,
const char *name,
snd_info_entry_t *parent)
{
snd_info_entry_t *entry = snd_info_create_entry(name);
if (entry) {
entry->module = module;
entry->parent = parent;
}
return entry;
}
/**
* snd_info_create_card_entry - create an info entry for the given card
* @card: the card instance
* @name: the file name
* @parent: the parent directory
*
* Creates a new info entry and assigns it to the given card.
*
* Returns the pointer of the new instance, or NULL on failure.
*/
snd_info_entry_t *snd_info_create_card_entry(snd_card_t * card,
const char *name,
snd_info_entry_t * parent)
{
snd_info_entry_t *entry = snd_info_create_entry(name);
if (entry) {
entry->module = card->module;
entry->card = card;
entry->parent = parent;
}
return entry;
}
static int snd_info_dev_free_entry(snd_device_t *device)
{
snd_info_entry_t *entry = device->device_data;
snd_info_free_entry(entry);
return 0;
}
static int snd_info_dev_register_entry(snd_device_t *device)
{
snd_info_entry_t *entry = device->device_data;
return snd_info_register(entry);
}
static int snd_info_dev_disconnect_entry(snd_device_t *device)
{
snd_info_entry_t *entry = device->device_data;
entry->disconnected = 1;
return 0;
}
static int snd_info_dev_unregister_entry(snd_device_t *device)
{
snd_info_entry_t *entry = device->device_data;
return snd_info_unregister(entry);
}
/**
* snd_card_proc_new - create an info entry for the given card
* @card: the card instance
* @name: the file name
* @entryp: the pointer to store the new info entry
*
* Creates a new info entry and assigns it to the given card.
* Unlike snd_info_create_card_entry(), this function registers the
* info entry as an ALSA device component, so that it can be
* unregistered/released without explicit call.
* Also, you don't have to register this entry via snd_info_register(),
* since this will be registered by snd_card_register() automatically.
*
* The parent is assumed as card->proc_root.
*
* For releasing this entry, use snd_device_free() instead of
* snd_info_free_entry().
*
* Returns zero if successful, or a negative error code on failure.
*/
int snd_card_proc_new(snd_card_t *card, const char *name,
snd_info_entry_t **entryp)
{
static snd_device_ops_t ops = {
.dev_free = snd_info_dev_free_entry,
.dev_register = snd_info_dev_register_entry,
.dev_disconnect = snd_info_dev_disconnect_entry,
.dev_unregister = snd_info_dev_unregister_entry
};
snd_info_entry_t *entry;
int err;
entry = snd_info_create_card_entry(card, name, card->proc_root);
if (! entry)
return -ENOMEM;
if ((err = snd_device_new(card, SNDRV_DEV_INFO, entry, &ops)) < 0) {
snd_info_free_entry(entry);
return err;
}
if (entryp)
*entryp = entry;
return 0;
}
/**
* snd_info_free_entry - release the info entry
* @entry: the info entry
*
* Releases the info entry. Don't call this after registered.
*/
void snd_info_free_entry(snd_info_entry_t * entry)
{
if (entry == NULL)
return;
kfree(entry->name);
if (entry->private_free)
entry->private_free(entry);
kfree(entry);
}
/**
* snd_info_register - register the info entry
* @entry: the info entry
*
* Registers the proc info entry.
*
* Returns zero if successful, or a negative error code on failure.
*/
int snd_info_register(snd_info_entry_t * entry)
{
struct proc_dir_entry *root, *p = NULL;
snd_assert(entry != NULL, return -ENXIO);
root = entry->parent == NULL ? snd_proc_root : entry->parent->p;
down(&info_mutex);
p = snd_create_proc_entry(entry->name, entry->mode, root);
if (!p) {
up(&info_mutex);
return -ENOMEM;
}
p->owner = entry->module;
if (!S_ISDIR(entry->mode))
p->proc_fops = &snd_info_entry_operations;
p->size = entry->size;
p->data = entry;
entry->p = p;
up(&info_mutex);
return 0;
}
/**
* snd_info_unregister - de-register the info entry
* @entry: the info entry
*
* De-registers the info entry and releases the instance.
*
* Returns zero if successful, or a negative error code on failure.
*/
int snd_info_unregister(snd_info_entry_t * entry)
{
struct proc_dir_entry *root;
snd_assert(entry != NULL && entry->p != NULL, return -ENXIO);
root = entry->parent == NULL ? snd_proc_root : entry->parent->p;
snd_assert(root, return -ENXIO);
down(&info_mutex);
snd_remove_proc_entry(root, entry->p);
up(&info_mutex);
snd_info_free_entry(entry);
return 0;
}
/*
*/
static snd_info_entry_t *snd_info_version_entry = NULL;
static void snd_info_version_read(snd_info_entry_t *entry, snd_info_buffer_t * buffer)
{
snd_iprintf(buffer,
"Advanced Linux Sound Architecture Driver Version "
CONFIG_SND_VERSION CONFIG_SND_DATE ".\n"
);
}
static int __init snd_info_version_init(void)
{
snd_info_entry_t *entry;
entry = snd_info_create_module_entry(THIS_MODULE, "version", NULL);
if (entry == NULL)
return -ENOMEM;
entry->c.text.read_size = 256;
entry->c.text.read = snd_info_version_read;
if (snd_info_register(entry) < 0) {
snd_info_free_entry(entry);
return -ENOMEM;
}
snd_info_version_entry = entry;
return 0;
}
static int __exit snd_info_version_done(void)
{
if (snd_info_version_entry)
snd_info_unregister(snd_info_version_entry);
return 0;
}
#endif /* CONFIG_PROC_FS */
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