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915 lines
20 KiB
915 lines
20 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Information interface for ALSA driver |
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* Copyright (c) by Jaroslav Kysela <[email protected]> |
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*/ |
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|
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#include <linux/init.h> |
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#include <linux/time.h> |
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#include <linux/mm.h> |
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#include <linux/slab.h> |
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#include <linux/string.h> |
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#include <linux/module.h> |
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#include <sound/core.h> |
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#include <sound/minors.h> |
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#include <sound/info.h> |
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#include <linux/utsname.h> |
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#include <linux/proc_fs.h> |
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#include <linux/mutex.h> |
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|
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int snd_info_check_reserved_words(const char *str) |
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{ |
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static const char * const reserved[] = |
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{ |
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"version", |
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"meminfo", |
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"memdebug", |
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"detect", |
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"devices", |
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"oss", |
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"cards", |
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"timers", |
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"synth", |
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"pcm", |
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"seq", |
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NULL |
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}; |
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const char * const *xstr = reserved; |
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while (*xstr) { |
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if (!strcmp(*xstr, str)) |
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return 0; |
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xstr++; |
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} |
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if (!strncmp(str, "card", 4)) |
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return 0; |
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return 1; |
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} |
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static DEFINE_MUTEX(info_mutex); |
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struct snd_info_private_data { |
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struct snd_info_buffer *rbuffer; |
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struct snd_info_buffer *wbuffer; |
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struct snd_info_entry *entry; |
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void *file_private_data; |
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}; |
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static int snd_info_version_init(void); |
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static void snd_info_disconnect(struct snd_info_entry *entry); |
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/* |
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*/ |
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static struct snd_info_entry *snd_proc_root; |
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struct snd_info_entry *snd_seq_root; |
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EXPORT_SYMBOL(snd_seq_root); |
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#ifdef CONFIG_SND_OSSEMUL |
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struct snd_info_entry *snd_oss_root; |
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#endif |
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static int alloc_info_private(struct snd_info_entry *entry, |
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struct snd_info_private_data **ret) |
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{ |
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struct snd_info_private_data *data; |
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if (!entry || !entry->p) |
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return -ENODEV; |
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if (!try_module_get(entry->module)) |
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return -EFAULT; |
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data = kzalloc(sizeof(*data), GFP_KERNEL); |
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if (!data) { |
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module_put(entry->module); |
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return -ENOMEM; |
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} |
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data->entry = entry; |
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*ret = data; |
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return 0; |
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} |
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static bool valid_pos(loff_t pos, size_t count) |
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{ |
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if (pos < 0 || (long) pos != pos || (ssize_t) count < 0) |
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return false; |
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if ((unsigned long) pos + (unsigned long) count < (unsigned long) pos) |
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return false; |
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return true; |
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} |
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/* |
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* file ops for binary proc files |
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*/ |
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static loff_t snd_info_entry_llseek(struct file *file, loff_t offset, int orig) |
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{ |
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struct snd_info_private_data *data; |
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struct snd_info_entry *entry; |
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loff_t ret = -EINVAL, size; |
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data = file->private_data; |
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entry = data->entry; |
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mutex_lock(&entry->access); |
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if (entry->c.ops->llseek) { |
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ret = entry->c.ops->llseek(entry, |
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data->file_private_data, |
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file, offset, orig); |
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goto out; |
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} |
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size = entry->size; |
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switch (orig) { |
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case SEEK_SET: |
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break; |
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case SEEK_CUR: |
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offset += file->f_pos; |
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break; |
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case SEEK_END: |
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if (!size) |
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goto out; |
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offset += size; |
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break; |
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default: |
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goto out; |
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} |
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if (offset < 0) |
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goto out; |
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if (size && offset > size) |
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offset = size; |
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file->f_pos = offset; |
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ret = offset; |
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out: |
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mutex_unlock(&entry->access); |
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return ret; |
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} |
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static ssize_t snd_info_entry_read(struct file *file, char __user *buffer, |
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size_t count, loff_t * offset) |
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{ |
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struct snd_info_private_data *data = file->private_data; |
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struct snd_info_entry *entry = data->entry; |
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size_t size; |
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loff_t pos; |
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pos = *offset; |
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if (!valid_pos(pos, count)) |
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return -EIO; |
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if (pos >= entry->size) |
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return 0; |
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size = entry->size - pos; |
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size = min(count, size); |
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size = entry->c.ops->read(entry, data->file_private_data, |
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file, buffer, size, pos); |
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if ((ssize_t) size > 0) |
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*offset = pos + size; |
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return size; |
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} |
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static ssize_t snd_info_entry_write(struct file *file, const char __user *buffer, |
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size_t count, loff_t * offset) |
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{ |
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struct snd_info_private_data *data = file->private_data; |
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struct snd_info_entry *entry = data->entry; |
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ssize_t size = 0; |
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loff_t pos; |
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pos = *offset; |
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if (!valid_pos(pos, count)) |
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return -EIO; |
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if (count > 0) { |
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size_t maxsize = entry->size - pos; |
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count = min(count, maxsize); |
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size = entry->c.ops->write(entry, data->file_private_data, |
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file, buffer, count, pos); |
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} |
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if (size > 0) |
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*offset = pos + size; |
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return size; |
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} |
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static __poll_t snd_info_entry_poll(struct file *file, poll_table *wait) |
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{ |
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struct snd_info_private_data *data = file->private_data; |
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struct snd_info_entry *entry = data->entry; |
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__poll_t mask = 0; |
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if (entry->c.ops->poll) |
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return entry->c.ops->poll(entry, |
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data->file_private_data, |
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file, wait); |
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if (entry->c.ops->read) |
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mask |= EPOLLIN | EPOLLRDNORM; |
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if (entry->c.ops->write) |
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mask |= EPOLLOUT | EPOLLWRNORM; |
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return mask; |
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} |
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static long snd_info_entry_ioctl(struct file *file, unsigned int cmd, |
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unsigned long arg) |
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{ |
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struct snd_info_private_data *data = file->private_data; |
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struct snd_info_entry *entry = data->entry; |
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if (!entry->c.ops->ioctl) |
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return -ENOTTY; |
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return entry->c.ops->ioctl(entry, data->file_private_data, |
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file, cmd, arg); |
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} |
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static int snd_info_entry_mmap(struct file *file, struct vm_area_struct *vma) |
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{ |
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struct inode *inode = file_inode(file); |
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struct snd_info_private_data *data; |
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struct snd_info_entry *entry; |
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data = file->private_data; |
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if (data == NULL) |
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return 0; |
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entry = data->entry; |
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if (!entry->c.ops->mmap) |
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return -ENXIO; |
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return entry->c.ops->mmap(entry, data->file_private_data, |
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inode, file, vma); |
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} |
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static int snd_info_entry_open(struct inode *inode, struct file *file) |
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{ |
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struct snd_info_entry *entry = pde_data(inode); |
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struct snd_info_private_data *data; |
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int mode, err; |
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mutex_lock(&info_mutex); |
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err = alloc_info_private(entry, &data); |
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if (err < 0) |
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goto unlock; |
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mode = file->f_flags & O_ACCMODE; |
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if (((mode == O_RDONLY || mode == O_RDWR) && !entry->c.ops->read) || |
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((mode == O_WRONLY || mode == O_RDWR) && !entry->c.ops->write)) { |
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err = -ENODEV; |
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goto error; |
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} |
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if (entry->c.ops->open) { |
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err = entry->c.ops->open(entry, mode, &data->file_private_data); |
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if (err < 0) |
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goto error; |
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} |
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file->private_data = data; |
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mutex_unlock(&info_mutex); |
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return 0; |
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error: |
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kfree(data); |
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module_put(entry->module); |
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unlock: |
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mutex_unlock(&info_mutex); |
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return err; |
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} |
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static int snd_info_entry_release(struct inode *inode, struct file *file) |
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{ |
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struct snd_info_private_data *data = file->private_data; |
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struct snd_info_entry *entry = data->entry; |
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if (entry->c.ops->release) |
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entry->c.ops->release(entry, file->f_flags & O_ACCMODE, |
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data->file_private_data); |
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module_put(entry->module); |
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kfree(data); |
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return 0; |
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} |
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static const struct proc_ops snd_info_entry_operations = |
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{ |
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.proc_lseek = snd_info_entry_llseek, |
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.proc_read = snd_info_entry_read, |
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.proc_write = snd_info_entry_write, |
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.proc_poll = snd_info_entry_poll, |
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.proc_ioctl = snd_info_entry_ioctl, |
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.proc_mmap = snd_info_entry_mmap, |
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.proc_open = snd_info_entry_open, |
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.proc_release = snd_info_entry_release, |
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}; |
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/* |
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* file ops for text proc files |
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*/ |
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static ssize_t snd_info_text_entry_write(struct file *file, |
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const char __user *buffer, |
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size_t count, loff_t *offset) |
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{ |
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struct seq_file *m = file->private_data; |
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struct snd_info_private_data *data = m->private; |
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struct snd_info_entry *entry = data->entry; |
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struct snd_info_buffer *buf; |
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loff_t pos; |
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size_t next; |
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int err = 0; |
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if (!entry->c.text.write) |
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return -EIO; |
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pos = *offset; |
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if (!valid_pos(pos, count)) |
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return -EIO; |
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next = pos + count; |
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/* don't handle too large text inputs */ |
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if (next > 16 * 1024) |
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return -EIO; |
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mutex_lock(&entry->access); |
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buf = data->wbuffer; |
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if (!buf) { |
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data->wbuffer = buf = kzalloc(sizeof(*buf), GFP_KERNEL); |
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if (!buf) { |
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err = -ENOMEM; |
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goto error; |
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} |
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} |
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if (next > buf->len) { |
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char *nbuf = kvzalloc(PAGE_ALIGN(next), GFP_KERNEL); |
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if (!nbuf) { |
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err = -ENOMEM; |
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goto error; |
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} |
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kvfree(buf->buffer); |
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buf->buffer = nbuf; |
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buf->len = PAGE_ALIGN(next); |
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} |
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if (copy_from_user(buf->buffer + pos, buffer, count)) { |
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err = -EFAULT; |
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goto error; |
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} |
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buf->size = next; |
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error: |
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mutex_unlock(&entry->access); |
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if (err < 0) |
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return err; |
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*offset = next; |
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return count; |
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} |
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static int snd_info_seq_show(struct seq_file *seq, void *p) |
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{ |
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struct snd_info_private_data *data = seq->private; |
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struct snd_info_entry *entry = data->entry; |
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if (!entry->c.text.read) { |
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return -EIO; |
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} else { |
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data->rbuffer->buffer = (char *)seq; /* XXX hack! */ |
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entry->c.text.read(entry, data->rbuffer); |
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} |
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return 0; |
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} |
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static int snd_info_text_entry_open(struct inode *inode, struct file *file) |
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{ |
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struct snd_info_entry *entry = pde_data(inode); |
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struct snd_info_private_data *data; |
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int err; |
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mutex_lock(&info_mutex); |
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err = alloc_info_private(entry, &data); |
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if (err < 0) |
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goto unlock; |
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data->rbuffer = kzalloc(sizeof(*data->rbuffer), GFP_KERNEL); |
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if (!data->rbuffer) { |
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err = -ENOMEM; |
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goto error; |
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} |
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if (entry->size) |
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err = single_open_size(file, snd_info_seq_show, data, |
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entry->size); |
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else |
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err = single_open(file, snd_info_seq_show, data); |
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if (err < 0) |
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goto error; |
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mutex_unlock(&info_mutex); |
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return 0; |
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error: |
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kfree(data->rbuffer); |
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kfree(data); |
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module_put(entry->module); |
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unlock: |
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mutex_unlock(&info_mutex); |
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return err; |
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} |
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static int snd_info_text_entry_release(struct inode *inode, struct file *file) |
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{ |
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struct seq_file *m = file->private_data; |
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struct snd_info_private_data *data = m->private; |
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struct snd_info_entry *entry = data->entry; |
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if (data->wbuffer && entry->c.text.write) |
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entry->c.text.write(entry, data->wbuffer); |
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single_release(inode, file); |
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kfree(data->rbuffer); |
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if (data->wbuffer) { |
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kvfree(data->wbuffer->buffer); |
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kfree(data->wbuffer); |
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} |
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module_put(entry->module); |
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kfree(data); |
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return 0; |
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} |
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static const struct proc_ops snd_info_text_entry_ops = |
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{ |
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.proc_open = snd_info_text_entry_open, |
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.proc_release = snd_info_text_entry_release, |
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.proc_write = snd_info_text_entry_write, |
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.proc_lseek = seq_lseek, |
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.proc_read = seq_read, |
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}; |
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static struct snd_info_entry *create_subdir(struct module *mod, |
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const char *name) |
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{ |
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struct snd_info_entry *entry; |
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entry = snd_info_create_module_entry(mod, name, NULL); |
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if (!entry) |
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return NULL; |
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entry->mode = S_IFDIR | 0555; |
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if (snd_info_register(entry) < 0) { |
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snd_info_free_entry(entry); |
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return NULL; |
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} |
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return entry; |
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} |
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static struct snd_info_entry * |
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snd_info_create_entry(const char *name, struct snd_info_entry *parent, |
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struct module *module); |
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int __init snd_info_init(void) |
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{ |
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snd_proc_root = snd_info_create_entry("asound", NULL, THIS_MODULE); |
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if (!snd_proc_root) |
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return -ENOMEM; |
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snd_proc_root->mode = S_IFDIR | 0555; |
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snd_proc_root->p = proc_mkdir("asound", NULL); |
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if (!snd_proc_root->p) |
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goto error; |
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#ifdef CONFIG_SND_OSSEMUL |
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snd_oss_root = create_subdir(THIS_MODULE, "oss"); |
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if (!snd_oss_root) |
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goto error; |
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#endif |
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#if IS_ENABLED(CONFIG_SND_SEQUENCER) |
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snd_seq_root = create_subdir(THIS_MODULE, "seq"); |
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if (!snd_seq_root) |
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goto error; |
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#endif |
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if (snd_info_version_init() < 0 || |
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snd_minor_info_init() < 0 || |
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snd_minor_info_oss_init() < 0 || |
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snd_card_info_init() < 0 || |
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snd_info_minor_register() < 0) |
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goto error; |
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return 0; |
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error: |
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snd_info_free_entry(snd_proc_root); |
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return -ENOMEM; |
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} |
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int __exit snd_info_done(void) |
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{ |
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snd_info_free_entry(snd_proc_root); |
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return 0; |
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} |
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static void snd_card_id_read(struct snd_info_entry *entry, |
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struct snd_info_buffer *buffer) |
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{ |
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struct snd_card *card = entry->private_data; |
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snd_iprintf(buffer, "%s\n", card->id); |
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} |
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/* |
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* create a card proc file |
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* called from init.c |
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*/ |
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int snd_info_card_create(struct snd_card *card) |
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{ |
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char str[8]; |
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struct snd_info_entry *entry; |
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if (snd_BUG_ON(!card)) |
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return -ENXIO; |
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sprintf(str, "card%i", card->number); |
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entry = create_subdir(card->module, str); |
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if (!entry) |
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return -ENOMEM; |
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card->proc_root = entry; |
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return snd_card_ro_proc_new(card, "id", card, snd_card_id_read); |
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} |
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/* |
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* register the card proc file |
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* called from init.c |
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* can be called multiple times for reinitialization |
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*/ |
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int snd_info_card_register(struct snd_card *card) |
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{ |
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struct proc_dir_entry *p; |
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int err; |
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if (snd_BUG_ON(!card)) |
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return -ENXIO; |
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err = snd_info_register(card->proc_root); |
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if (err < 0) |
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return err; |
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if (!strcmp(card->id, card->proc_root->name)) |
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return 0; |
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if (card->proc_root_link) |
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return 0; |
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p = proc_symlink(card->id, snd_proc_root->p, card->proc_root->name); |
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if (!p) |
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return -ENOMEM; |
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card->proc_root_link = p; |
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return 0; |
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} |
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/* |
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* called on card->id change |
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*/ |
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void snd_info_card_id_change(struct snd_card *card) |
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{ |
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mutex_lock(&info_mutex); |
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if (card->proc_root_link) { |
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proc_remove(card->proc_root_link); |
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card->proc_root_link = NULL; |
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} |
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if (strcmp(card->id, card->proc_root->name)) |
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card->proc_root_link = proc_symlink(card->id, |
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snd_proc_root->p, |
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card->proc_root->name); |
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mutex_unlock(&info_mutex); |
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} |
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|
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/* |
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* de-register the card proc file |
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* called from init.c |
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*/ |
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void snd_info_card_disconnect(struct snd_card *card) |
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{ |
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if (!card) |
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return; |
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mutex_lock(&info_mutex); |
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proc_remove(card->proc_root_link); |
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card->proc_root_link = NULL; |
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if (card->proc_root) |
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snd_info_disconnect(card->proc_root); |
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mutex_unlock(&info_mutex); |
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} |
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|
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/* |
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* release the card proc file resources |
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* called from init.c |
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*/ |
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int snd_info_card_free(struct snd_card *card) |
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{ |
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if (!card) |
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return 0; |
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snd_info_free_entry(card->proc_root); |
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card->proc_root = NULL; |
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return 0; |
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} |
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|
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|
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/** |
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* snd_info_get_line - read one line from the procfs buffer |
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* @buffer: the procfs buffer |
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* @line: the buffer to store |
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* @len: the max. buffer size |
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* |
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* Reads one line from the buffer and stores the string. |
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* |
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* Return: Zero if successful, or 1 if error or EOF. |
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*/ |
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int snd_info_get_line(struct snd_info_buffer *buffer, char *line, int len) |
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{ |
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int c; |
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|
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if (snd_BUG_ON(!buffer)) |
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return 1; |
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if (!buffer->buffer) |
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return 1; |
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if (len <= 0 || buffer->stop || buffer->error) |
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return 1; |
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while (!buffer->stop) { |
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c = buffer->buffer[buffer->curr++]; |
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if (buffer->curr >= buffer->size) |
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buffer->stop = 1; |
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if (c == '\n') |
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break; |
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if (len > 1) { |
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len--; |
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*line++ = c; |
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} |
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} |
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*line = '\0'; |
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return 0; |
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} |
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EXPORT_SYMBOL(snd_info_get_line); |
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|
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/** |
|
* 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 |
|
* @parent: the parent directory |
|
* |
|
* 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 *parent, |
|
struct module *module) |
|
{ |
|
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 | 0444; |
|
entry->content = SNDRV_INFO_CONTENT_TEXT; |
|
mutex_init(&entry->access); |
|
INIT_LIST_HEAD(&entry->children); |
|
INIT_LIST_HEAD(&entry->list); |
|
entry->parent = parent; |
|
entry->module = module; |
|
if (parent) { |
|
mutex_lock(&parent->access); |
|
list_add_tail(&entry->list, &parent->children); |
|
mutex_unlock(&parent->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. |
|
* |
|
* 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) |
|
{ |
|
if (!parent) |
|
parent = snd_proc_root; |
|
return snd_info_create_entry(name, parent, module); |
|
} |
|
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) |
|
{ |
|
if (!parent) |
|
parent = card->proc_root; |
|
return snd_info_create_entry(name, parent, card->module); |
|
} |
|
EXPORT_SYMBOL(snd_info_create_card_entry); |
|
|
|
static void snd_info_disconnect(struct snd_info_entry *entry) |
|
{ |
|
struct snd_info_entry *p; |
|
|
|
if (!entry->p) |
|
return; |
|
list_for_each_entry(p, &entry->children, list) |
|
snd_info_disconnect(p); |
|
proc_remove(entry->p); |
|
entry->p = NULL; |
|
} |
|
|
|
/** |
|
* snd_info_free_entry - release the info entry |
|
* @entry: the info entry |
|
* |
|
* Releases the info entry. |
|
*/ |
|
void snd_info_free_entry(struct snd_info_entry * entry) |
|
{ |
|
struct snd_info_entry *p, *n; |
|
|
|
if (!entry) |
|
return; |
|
if (entry->p) { |
|
mutex_lock(&info_mutex); |
|
snd_info_disconnect(entry); |
|
mutex_unlock(&info_mutex); |
|
} |
|
|
|
/* free all children at first */ |
|
list_for_each_entry_safe(p, n, &entry->children, list) |
|
snd_info_free_entry(p); |
|
|
|
p = entry->parent; |
|
if (p) { |
|
mutex_lock(&p->access); |
|
list_del(&entry->list); |
|
mutex_unlock(&p->access); |
|
} |
|
kfree(entry->name); |
|
if (entry->private_free) |
|
entry->private_free(entry); |
|
kfree(entry); |
|
} |
|
EXPORT_SYMBOL(snd_info_free_entry); |
|
|
|
static 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->p : entry->parent->p; |
|
mutex_lock(&info_mutex); |
|
if (entry->p || !root) |
|
goto unlock; |
|
if (S_ISDIR(entry->mode)) { |
|
p = proc_mkdir_mode(entry->name, entry->mode, root); |
|
if (!p) { |
|
mutex_unlock(&info_mutex); |
|
return -ENOMEM; |
|
} |
|
} else { |
|
const struct proc_ops *ops; |
|
if (entry->content == SNDRV_INFO_CONTENT_DATA) |
|
ops = &snd_info_entry_operations; |
|
else |
|
ops = &snd_info_text_entry_ops; |
|
p = proc_create_data(entry->name, entry->mode, root, |
|
ops, entry); |
|
if (!p) { |
|
mutex_unlock(&info_mutex); |
|
return -ENOMEM; |
|
} |
|
proc_set_size(p, entry->size); |
|
} |
|
entry->p = p; |
|
unlock: |
|
mutex_unlock(&info_mutex); |
|
return 0; |
|
} |
|
|
|
/** |
|
* snd_info_register - register the info entry |
|
* @entry: the info entry |
|
* |
|
* Registers the proc info entry. |
|
* The all children entries are registered recursively. |
|
* |
|
* Return: Zero if successful, or a negative error code on failure. |
|
*/ |
|
int snd_info_register(struct snd_info_entry *entry) |
|
{ |
|
struct snd_info_entry *p; |
|
int err; |
|
|
|
if (!entry->p) { |
|
err = __snd_info_register(entry); |
|
if (err < 0) |
|
return err; |
|
} |
|
|
|
list_for_each_entry(p, &entry->children, list) { |
|
err = snd_info_register(p); |
|
if (err < 0) |
|
return err; |
|
} |
|
|
|
return 0; |
|
} |
|
EXPORT_SYMBOL(snd_info_register); |
|
|
|
/** |
|
* snd_card_rw_proc_new - Create a read/write text proc file entry for the card |
|
* @card: the card instance |
|
* @name: the file name |
|
* @private_data: the arbitrary private data |
|
* @read: the read callback |
|
* @write: the write callback, NULL for read-only |
|
* |
|
* This proc file entry will be registered via snd_card_register() call, and |
|
* it will be removed automatically at the card removal, too. |
|
* |
|
* Return: zero if successful, or a negative error code |
|
*/ |
|
int snd_card_rw_proc_new(struct snd_card *card, const char *name, |
|
void *private_data, |
|
void (*read)(struct snd_info_entry *, |
|
struct snd_info_buffer *), |
|
void (*write)(struct snd_info_entry *entry, |
|
struct snd_info_buffer *buffer)) |
|
{ |
|
struct snd_info_entry *entry; |
|
|
|
entry = snd_info_create_card_entry(card, name, card->proc_root); |
|
if (!entry) |
|
return -ENOMEM; |
|
snd_info_set_text_ops(entry, private_data, read); |
|
if (write) { |
|
entry->mode |= 0200; |
|
entry->c.text.write = write; |
|
} |
|
return 0; |
|
} |
|
EXPORT_SYMBOL_GPL(snd_card_rw_proc_new); |
|
|
|
/* |
|
|
|
*/ |
|
|
|
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; |
|
return snd_info_register(entry); /* freed in error path */ |
|
}
|
|
|