4adb7bcbcb
seq_file is _the_ standard interface for simple text proc files. Though, we still need to support the binary proc files and the text file write, and also we need to manage the device disconnection gracefully. Thus this patch just replaces the text file read code with seq_file while keeping the rest intact. snd_iprintf() helper function is now a macro to expand itself to seq_printf() to be compatible with the existing code. The seq_file object is stored to the unused entry->rbuffer->buffer pointer. When the output size is expected to be large (greater than PAGE_SIZE), the driver should set entry->size field beforehand. Then the given size will be preallocated and the multiple show calls can be avoided. Acked-by: Jaroslav Kysela <perex@perex.cz> Signed-off-by: Takashi Iwai <tiwai@suse.de>
938 lines
21 KiB
C
938 lines
21 KiB
C
/*
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* Information interface for ALSA driver
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* Copyright (c) by Jaroslav Kysela <perex@perex.cz>
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*
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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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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#include <stdarg.h>
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/*
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*
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*/
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#ifdef CONFIG_PROC_FS
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int snd_info_check_reserved_words(const char *str)
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{
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static char *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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char **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 int snd_info_version_done(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 proc_dir_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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offset = 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 unsigned int 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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unsigned int 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 |= POLLIN | POLLRDNORM;
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if (entry->c.ops->write)
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mask |= POLLOUT | POLLWRNORM;
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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 file_operations snd_info_entry_operations =
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{
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.owner = THIS_MODULE,
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.llseek = snd_info_entry_llseek,
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.read = snd_info_entry_read,
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.write = snd_info_entry_write,
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.poll = snd_info_entry_poll,
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.unlocked_ioctl = snd_info_entry_ioctl,
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.mmap = snd_info_entry_mmap,
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.open = snd_info_entry_open,
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.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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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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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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if (next > buf->len) {
|
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char *nbuf = krealloc(buf->buffer, PAGE_ALIGN(next),
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GFP_KERNEL | __GFP_ZERO);
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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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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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|
|
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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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|
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if (entry->c.text.read) {
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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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|
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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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|
}
|
|
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;
|
|
|
|
error:
|
|
kfree(data->rbuffer);
|
|
kfree(data);
|
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module_put(entry->module);
|
|
unlock:
|
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mutex_unlock(&info_mutex);
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return err;
|
|
}
|
|
|
|
static int snd_info_text_entry_release(struct inode *inode, struct file *file)
|
|
{
|
|
struct seq_file *m = file->private_data;
|
|
struct snd_info_private_data *data = m->private;
|
|
struct snd_info_entry *entry = data->entry;
|
|
|
|
if (data->wbuffer && entry->c.text.write)
|
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entry->c.text.write(entry, data->wbuffer);
|
|
|
|
single_release(inode, file);
|
|
kfree(data->rbuffer);
|
|
if (data->wbuffer) {
|
|
kfree(data->wbuffer->buffer);
|
|
kfree(data->wbuffer);
|
|
}
|
|
|
|
module_put(entry->module);
|
|
kfree(data);
|
|
return 0;
|
|
}
|
|
|
|
static const struct file_operations snd_info_text_entry_ops =
|
|
{
|
|
.owner = THIS_MODULE,
|
|
.open = snd_info_text_entry_open,
|
|
.release = snd_info_text_entry_release,
|
|
.write = snd_info_text_entry_write,
|
|
.llseek = seq_lseek,
|
|
.read = seq_read,
|
|
};
|
|
|
|
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 {
|
|
const struct file_operations *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;
|
|
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 */
|