diff options
Diffstat (limited to 'sound/core/info.c')
| -rw-r--r-- | sound/core/info.c | 989 |
1 files changed, 989 insertions, 0 deletions
diff --git a/sound/core/info.c b/sound/core/info.c new file mode 100644 index 00000000000..31faffe01cb --- /dev/null +++ b/sound/core/info.c @@ -0,0 +1,989 @@ +/* + * 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 <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 = snd_kmalloc_strdup(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 */ |