From 57f0f512b273f60d52568b8c6b77e17f5636edc0 Mon Sep 17 00:00:00 2001 From: André Fabian Silva Delgado Date: Wed, 5 Aug 2015 17:04:01 -0300 Subject: Initial import --- sound/core/info.c | 1010 +++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 1010 insertions(+) create mode 100644 sound/core/info.c (limited to 'sound/core/info.c') diff --git a/sound/core/info.c b/sound/core/info.c new file mode 100644 index 000000000..9f404e965 --- /dev/null +++ b/sound/core/info.c @@ -0,0 +1,1010 @@ +/* + * Information interface for ALSA driver + * Copyright (c) by Jaroslav Kysela + * + * + * 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 +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +/* + * + */ + +#ifdef CONFIG_PROC_FS + +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; +} + +static DEFINE_MUTEX(info_mutex); + +struct snd_info_private_data { + struct snd_info_buffer *rbuffer; + struct snd_info_buffer *wbuffer; + struct snd_info_entry *entry; + void *file_private_data; +}; + +static int snd_info_version_init(void); +static int snd_info_version_done(void); +static void snd_info_disconnect(struct snd_info_entry *entry); + + +/* resize the proc r/w buffer */ +static int resize_info_buffer(struct snd_info_buffer *buffer, + unsigned int nsize) +{ + char *nbuf; + + nsize = PAGE_ALIGN(nsize); + nbuf = krealloc(buffer->buffer, nsize, GFP_KERNEL | __GFP_ZERO); + if (! nbuf) + return -ENOMEM; + + buffer->buffer = nbuf; + buffer->len = nsize; + return 0; +} + +/** + * 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(). + * + * Return: The size of output string, or a negative error code. + */ +int snd_iprintf(struct snd_info_buffer *buffer, const char *fmt, ...) +{ + va_list args; + int len, res; + int err = 0; + + might_sleep(); + if (buffer->stop || buffer->error) + return 0; + len = buffer->len - buffer->size; + va_start(args, fmt); + for (;;) { + va_list ap; + va_copy(ap, args); + res = vsnprintf(buffer->buffer + buffer->curr, len, fmt, ap); + va_end(ap); + if (res < len) + break; + err = resize_info_buffer(buffer, buffer->len + PAGE_SIZE); + if (err < 0) + break; + len = buffer->len - buffer->size; + } + va_end(args); + + if (err < 0) + return err; + buffer->curr += res; + buffer->size += res; + return res; +} + +EXPORT_SYMBOL(snd_iprintf); + +/* + + */ + +static struct proc_dir_entry *snd_proc_root; +struct snd_info_entry *snd_seq_root; +EXPORT_SYMBOL(snd_seq_root); + +#ifdef CONFIG_SND_OSSEMUL +struct snd_info_entry *snd_oss_root; +#endif + +static loff_t snd_info_entry_llseek(struct file *file, loff_t offset, int orig) +{ + struct snd_info_private_data *data; + struct snd_info_entry *entry; + loff_t ret = -EINVAL, size; + + data = file->private_data; + entry = data->entry; + mutex_lock(&entry->access); + if (entry->content == SNDRV_INFO_CONTENT_DATA && + entry->c.ops->llseek) { + offset = entry->c.ops->llseek(entry, + data->file_private_data, + file, offset, orig); + goto out; + } + if (entry->content == SNDRV_INFO_CONTENT_DATA) + size = entry->size; + else + size = 0; + switch (orig) { + case SEEK_SET: + break; + case SEEK_CUR: + offset += file->f_pos; + break; + case SEEK_END: + if (!size) + goto out; + offset += size; + break; + default: + goto out; + } + if (offset < 0) + goto out; + if (size && offset > size) + offset = size; + file->f_pos = offset; + ret = offset; + out: + mutex_unlock(&entry->access); + return ret; +} + +static ssize_t snd_info_entry_read(struct file *file, char __user *buffer, + size_t count, loff_t * offset) +{ + struct snd_info_private_data *data; + struct snd_info_entry *entry; + struct snd_info_buffer *buf; + size_t size = 0; + loff_t pos; + + data = file->private_data; + if (snd_BUG_ON(!data)) + 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 (pos >= entry->size) + return 0; + if (entry->c.ops->read) { + size = entry->size - pos; + size = min(count, size); + size = entry->c.ops->read(entry, + data->file_private_data, + file, buffer, size, 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) +{ + struct snd_info_private_data *data; + struct snd_info_entry *entry; + struct snd_info_buffer *buf; + ssize_t size = 0; + loff_t pos; + + data = file->private_data; + if (snd_BUG_ON(!data)) + 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; + mutex_lock(&entry->access); + if (pos + count >= buf->len) { + if (resize_info_buffer(buf, pos + count)) { + mutex_unlock(&entry->access); + return -ENOMEM; + } + } + if (copy_from_user(buf->buffer + pos, buffer, count)) { + mutex_unlock(&entry->access); + return -EFAULT; + } + buf->size = pos + count; + mutex_unlock(&entry->access); + size = count; + break; + case SNDRV_INFO_CONTENT_DATA: + if (entry->c.ops->write && count > 0) { + size_t maxsize = entry->size - pos; + count = min(count, maxsize); + 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) +{ + struct snd_info_entry *entry; + struct snd_info_private_data *data; + struct snd_info_buffer *buffer; + int mode, err; + + mutex_lock(&info_mutex); + entry = PDE_DATA(inode); + if (entry == NULL || ! entry->p) { + mutex_unlock(&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_DATA && + entry->c.ops->read == NULL)) { + err = -ENODEV; + goto __error; + } + } + if (mode == O_WRONLY || mode == O_RDWR) { + if ((entry->content == SNDRV_INFO_CONTENT_DATA && + entry->c.ops->write == NULL)) { + err = -ENODEV; + goto __error; + } + } + data = kzalloc(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 = kzalloc(sizeof(*buffer), GFP_KERNEL); + if (buffer == NULL) + goto __nomem; + data->rbuffer = buffer; + buffer->len = PAGE_SIZE; + buffer->buffer = kzalloc(buffer->len, GFP_KERNEL); + if (buffer->buffer == NULL) + goto __nomem; + } + if (mode == O_WRONLY || mode == O_RDWR) { + buffer = kzalloc(sizeof(*buffer), GFP_KERNEL); + if (buffer == NULL) + goto __nomem; + data->wbuffer = buffer; + buffer->len = PAGE_SIZE; + buffer->buffer = kmalloc(buffer->len, GFP_KERNEL); + if (buffer->buffer == NULL) + goto __nomem; + } + 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; + mutex_unlock(&info_mutex); + if (entry->content == SNDRV_INFO_CONTENT_TEXT && + (mode == O_RDONLY || mode == O_RDWR)) { + if (entry->c.text.read) { + mutex_lock(&entry->access); + entry->c.text.read(entry, data->rbuffer); + mutex_unlock(&entry->access); + } + } + return 0; + + __nomem: + if (data->rbuffer) { + kfree(data->rbuffer->buffer); + kfree(data->rbuffer); + } + if (data->wbuffer) { + kfree(data->wbuffer->buffer); + kfree(data->wbuffer); + } + kfree(data); + err = -ENOMEM; + __error: + module_put(entry->module); + __error1: + mutex_unlock(&info_mutex); + return err; +} + +static int snd_info_entry_release(struct inode *inode, struct file *file) +{ + struct snd_info_entry *entry; + struct snd_info_private_data *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 (data->rbuffer) { + kfree(data->rbuffer->buffer); + kfree(data->rbuffer); + } + if (data->wbuffer) { + if (entry->c.text.write) { + entry->c.text.write(entry, data->wbuffer); + if (data->wbuffer->error) { + if (entry->card) + dev_warn(entry->card->dev, "info: data write error to %s (%i)\n", + entry->name, + data->wbuffer->error); + else + pr_warn("ALSA: info: data write error to %s (%i)\n", + entry->name, + data->wbuffer->error); + } + } + kfree(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) +{ + struct snd_info_private_data *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 long snd_info_entry_ioctl(struct file *file, unsigned int cmd, + unsigned long arg) +{ + struct snd_info_private_data *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; +} + +static int snd_info_entry_mmap(struct file *file, struct vm_area_struct *vma) +{ + struct inode *inode = file_inode(file); + struct snd_info_private_data *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 const 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, + .unlocked_ioctl = snd_info_entry_ioctl, + .mmap = snd_info_entry_mmap, + .open = snd_info_entry_open, + .release = snd_info_entry_release, +}; + +int __init snd_info_init(void) +{ + struct proc_dir_entry *p; + + p = proc_mkdir("asound", NULL); + if (p == NULL) + return -ENOMEM; + snd_proc_root = p; +#ifdef CONFIG_SND_OSSEMUL + { + struct snd_info_entry *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 IS_ENABLED(CONFIG_SND_SEQUENCER) + { + struct snd_info_entry *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_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_info_version_done(); + if (snd_proc_root) { +#if IS_ENABLED(CONFIG_SND_SEQUENCER) + snd_info_free_entry(snd_seq_root); +#endif +#ifdef CONFIG_SND_OSSEMUL + snd_info_free_entry(snd_oss_root); +#endif + proc_remove(snd_proc_root); + } + return 0; +} + +/* + + */ + + +/* + * create a card proc file + * called from init.c + */ +int snd_info_card_create(struct snd_card *card) +{ + char str[8]; + struct snd_info_entry *entry; + + if (snd_BUG_ON(!card)) + 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(struct snd_card *card) +{ + struct proc_dir_entry *p; + + if (snd_BUG_ON(!card)) + 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; +} + +/* + * called on card->id change + */ +void snd_info_card_id_change(struct snd_card *card) +{ + mutex_lock(&info_mutex); + if (card->proc_root_link) { + proc_remove(card->proc_root_link); + card->proc_root_link = NULL; + } + if (strcmp(card->id, card->proc_root->name)) + card->proc_root_link = proc_symlink(card->id, + snd_proc_root, + card->proc_root->name); + mutex_unlock(&info_mutex); +} + +/* + * de-register the card proc file + * called from init.c + */ +void snd_info_card_disconnect(struct snd_card *card) +{ + if (!card) + return; + mutex_lock(&info_mutex); + proc_remove(card->proc_root_link); + card->proc_root_link = NULL; + if (card->proc_root) + snd_info_disconnect(card->proc_root); + mutex_unlock(&info_mutex); +} + +/* + * release the card proc file resources + * called from init.c + */ +int snd_info_card_free(struct snd_card *card) +{ + if (!card) + return 0; + snd_info_free_entry(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 + * + * Reads one line from the buffer and stores the string. + * + * Return: Zero if successful, or 1 if error or EOF. + */ +int snd_info_get_line(struct snd_info_buffer *buffer, char *line, int len) +{ + int c = -1; + + if (snd_BUG_ON(!buffer || !buffer->buffer)) + return 1; + if (len <= 0 || buffer->stop || buffer->error) + return 1; + while (!buffer->stop) { + c = buffer->buffer[buffer->curr++]; + if (buffer->curr >= buffer->size) + buffer->stop = 1; + if (c == '\n') + break; + if (len > 1) { + len--; + *line++ = c; + } + } + *line = '\0'; + return 0; +} + +EXPORT_SYMBOL(snd_info_get_line); + +/** + * snd_info_get_str - 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. + * + * Return: The updated pointer of the original string so that + * it can be used for the next call. + */ +const char *snd_info_get_str(char *dest, const 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; +} + +EXPORT_SYMBOL(snd_info_get_str); + +/** + * 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(). + * + * Return: The pointer of the new instance, or %NULL on failure. + */ +static struct snd_info_entry *snd_info_create_entry(const char *name) +{ + struct snd_info_entry *entry; + entry = kzalloc(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; + mutex_init(&entry->access); + INIT_LIST_HEAD(&entry->children); + INIT_LIST_HEAD(&entry->list); + 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. + * + * Return: The pointer of the new instance, or %NULL on failure. + */ +struct snd_info_entry *snd_info_create_module_entry(struct module * module, + const char *name, + struct snd_info_entry *parent) +{ + struct snd_info_entry *entry = snd_info_create_entry(name); + if (entry) { + entry->module = module; + entry->parent = parent; + } + return entry; +} + +EXPORT_SYMBOL(snd_info_create_module_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. + * + * Return: The pointer of the new instance, or %NULL on failure. + */ +struct snd_info_entry *snd_info_create_card_entry(struct snd_card *card, + const char *name, + struct snd_info_entry * parent) +{ + struct snd_info_entry *entry = snd_info_create_entry(name); + if (entry) { + entry->module = card->module; + entry->card = card; + entry->parent = parent; + } + return entry; +} + +EXPORT_SYMBOL(snd_info_create_card_entry); + +static void snd_info_disconnect(struct snd_info_entry *entry) +{ + struct list_head *p, *n; + struct proc_dir_entry *root; + + list_for_each_safe(p, n, &entry->children) { + snd_info_disconnect(list_entry(p, struct snd_info_entry, list)); + } + + if (! entry->p) + return; + list_del_init(&entry->list); + root = entry->parent == NULL ? snd_proc_root : entry->parent->p; + snd_BUG_ON(!root); + proc_remove(entry->p); + entry->p = NULL; +} + +static int snd_info_dev_free_entry(struct snd_device *device) +{ + struct snd_info_entry *entry = device->device_data; + snd_info_free_entry(entry); + return 0; +} + +static int snd_info_dev_register_entry(struct snd_device *device) +{ + struct snd_info_entry *entry = device->device_data; + return snd_info_register(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(). + * + * Return: Zero if successful, or a negative error code on failure. + */ +int snd_card_proc_new(struct snd_card *card, const char *name, + struct snd_info_entry **entryp) +{ + static struct snd_device_ops ops = { + .dev_free = snd_info_dev_free_entry, + .dev_register = snd_info_dev_register_entry, + /* disconnect is done via snd_info_card_disconnect() */ + }; + struct snd_info_entry *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; +} + +EXPORT_SYMBOL(snd_card_proc_new); + +/** + * 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(struct snd_info_entry * entry) +{ + if (entry == NULL) + return; + if (entry->p) { + mutex_lock(&info_mutex); + snd_info_disconnect(entry); + mutex_unlock(&info_mutex); + } + kfree(entry->name); + if (entry->private_free) + entry->private_free(entry); + kfree(entry); +} + +EXPORT_SYMBOL(snd_info_free_entry); + +/** + * snd_info_register - register the info entry + * @entry: the info entry + * + * Registers the proc info entry. + * + * Return: Zero if successful, or a negative error code on failure. + */ +int snd_info_register(struct snd_info_entry * entry) +{ + struct proc_dir_entry *root, *p = NULL; + + if (snd_BUG_ON(!entry)) + return -ENXIO; + root = entry->parent == NULL ? snd_proc_root : entry->parent->p; + mutex_lock(&info_mutex); + if (S_ISDIR(entry->mode)) { + p = proc_mkdir_mode(entry->name, entry->mode, root); + if (!p) { + mutex_unlock(&info_mutex); + return -ENOMEM; + } + } else { + p = proc_create_data(entry->name, entry->mode, root, + &snd_info_entry_operations, entry); + if (!p) { + mutex_unlock(&info_mutex); + return -ENOMEM; + } + proc_set_size(p, entry->size); + } + entry->p = p; + if (entry->parent) + list_add_tail(&entry->list, &entry->parent->children); + mutex_unlock(&info_mutex); + return 0; +} + +EXPORT_SYMBOL(snd_info_register); + +/* + + */ + +static struct snd_info_entry *snd_info_version_entry; + +static void snd_info_version_read(struct snd_info_entry *entry, struct snd_info_buffer *buffer) +{ + snd_iprintf(buffer, + "Advanced Linux Sound Architecture Driver Version k%s.\n", + init_utsname()->release); +} + +static int __init snd_info_version_init(void) +{ + struct snd_info_entry *entry; + + entry = snd_info_create_module_entry(THIS_MODULE, "version", NULL); + if (entry == NULL) + return -ENOMEM; + 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) +{ + snd_info_free_entry(snd_info_version_entry); + return 0; +} + +#endif /* CONFIG_PROC_FS */ -- cgit v1.2.3-54-g00ecf