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![Takashi Iwai](/assets/img/avatar_default.png)
This header file exists only for some hacks to adapt alsa-driver tree. It's useless for building in the kernel. Let's move a few lines in it to sound/core.h and remove it. With this patch, sound/driver.h isn't removed but has just a single compile warning to include it. This should be really killed in future. Signed-off-by: Takashi Iwai <tiwai@suse.de> Signed-off-by: Jaroslav Kysela <perex@perex.cz>
1007 lines
23 KiB
C
1007 lines
23 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/smp_lock.h>
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#include <linux/string.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 <sound/version.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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/* resize the proc r/w buffer */
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static int resize_info_buffer(struct snd_info_buffer *buffer,
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unsigned int nsize)
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{
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char *nbuf;
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nsize = PAGE_ALIGN(nsize);
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nbuf = kmalloc(nsize, GFP_KERNEL);
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if (! nbuf)
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return -ENOMEM;
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memcpy(nbuf, buffer->buffer, buffer->len);
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kfree(buffer->buffer);
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buffer->buffer = nbuf;
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buffer->len = nsize;
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return 0;
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}
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/**
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* snd_iprintf - printf on the procfs buffer
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* @buffer: the procfs buffer
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* @fmt: the printf format
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*
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* Outputs the string on the procfs buffer just like printf().
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*
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* Returns the size of output string.
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*/
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int snd_iprintf(struct snd_info_buffer *buffer, char *fmt,...)
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{
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va_list args;
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int len, res;
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int err = 0;
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might_sleep();
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if (buffer->stop || buffer->error)
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return 0;
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len = buffer->len - buffer->size;
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va_start(args, fmt);
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for (;;) {
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va_list ap;
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va_copy(ap, args);
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res = vsnprintf(buffer->buffer + buffer->curr, len, fmt, ap);
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va_end(ap);
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if (res < len)
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break;
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err = resize_info_buffer(buffer, buffer->len + PAGE_SIZE);
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if (err < 0)
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break;
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len = buffer->len - buffer->size;
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}
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va_end(args);
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if (err < 0)
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return err;
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buffer->curr += res;
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buffer->size += res;
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return res;
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}
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EXPORT_SYMBOL(snd_iprintf);
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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 inline void snd_info_entry_prepare(struct proc_dir_entry *de)
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{
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de->owner = THIS_MODULE;
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}
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static void snd_remove_proc_entry(struct proc_dir_entry *parent,
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struct proc_dir_entry *de)
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{
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if (de)
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remove_proc_entry(de->name, parent);
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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;
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data = file->private_data;
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entry = data->entry;
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lock_kernel();
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switch (entry->content) {
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case SNDRV_INFO_CONTENT_TEXT:
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switch (orig) {
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case SEEK_SET:
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file->f_pos = offset;
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ret = file->f_pos;
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goto out;
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case SEEK_CUR:
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file->f_pos += offset;
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ret = file->f_pos;
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goto out;
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case SEEK_END:
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default:
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ret = -EINVAL;
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goto out;
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}
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break;
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case SNDRV_INFO_CONTENT_DATA:
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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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break;
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}
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ret = -ENXIO;
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out:
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unlock_kernel();
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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;
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struct snd_info_entry *entry;
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struct snd_info_buffer *buf;
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size_t size = 0;
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loff_t pos;
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data = file->private_data;
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snd_assert(data != NULL, return -ENXIO);
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pos = *offset;
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if (pos < 0 || (long) pos != pos || (ssize_t) count < 0)
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return -EIO;
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if ((unsigned long) pos + (unsigned long) count < (unsigned long) pos)
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return -EIO;
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entry = data->entry;
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switch (entry->content) {
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case SNDRV_INFO_CONTENT_TEXT:
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buf = data->rbuffer;
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if (buf == NULL)
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return -EIO;
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if (pos >= buf->size)
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return 0;
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size = buf->size - pos;
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size = min(count, size);
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if (copy_to_user(buffer, buf->buffer + pos, size))
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return -EFAULT;
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break;
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case SNDRV_INFO_CONTENT_DATA:
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if (entry->c.ops->read)
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size = entry->c.ops->read(entry,
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data->file_private_data,
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file, buffer, count, pos);
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break;
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}
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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;
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struct snd_info_entry *entry;
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struct snd_info_buffer *buf;
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ssize_t size = 0;
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loff_t pos;
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data = file->private_data;
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snd_assert(data != NULL, return -ENXIO);
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entry = data->entry;
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pos = *offset;
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if (pos < 0 || (long) pos != pos || (ssize_t) count < 0)
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return -EIO;
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if ((unsigned long) pos + (unsigned long) count < (unsigned long) pos)
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return -EIO;
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switch (entry->content) {
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case SNDRV_INFO_CONTENT_TEXT:
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buf = data->wbuffer;
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if (buf == NULL)
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return -EIO;
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mutex_lock(&entry->access);
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if (pos + count >= buf->len) {
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if (resize_info_buffer(buf, pos + count)) {
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mutex_unlock(&entry->access);
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return -ENOMEM;
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}
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}
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if (copy_from_user(buf->buffer + pos, buffer, count)) {
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mutex_unlock(&entry->access);
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return -EFAULT;
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}
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buf->size = pos + count;
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mutex_unlock(&entry->access);
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size = count;
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break;
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case SNDRV_INFO_CONTENT_DATA:
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if (entry->c.ops->write)
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size = entry->c.ops->write(entry,
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data->file_private_data,
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file, buffer, count, pos);
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break;
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}
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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 int snd_info_entry_open(struct inode *inode, struct file *file)
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{
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struct snd_info_entry *entry;
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struct snd_info_private_data *data;
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struct snd_info_buffer *buffer;
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struct proc_dir_entry *p;
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int mode, err;
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mutex_lock(&info_mutex);
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p = PDE(inode);
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entry = p == NULL ? NULL : (struct snd_info_entry *)p->data;
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if (entry == NULL || ! entry->p) {
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mutex_unlock(&info_mutex);
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return -ENODEV;
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}
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if (!try_module_get(entry->module)) {
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err = -EFAULT;
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goto __error1;
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}
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mode = file->f_flags & O_ACCMODE;
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if (mode == O_RDONLY || mode == O_RDWR) {
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if ((entry->content == SNDRV_INFO_CONTENT_DATA &&
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entry->c.ops->read == NULL)) {
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err = -ENODEV;
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goto __error;
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}
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}
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if (mode == O_WRONLY || mode == O_RDWR) {
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if ((entry->content == SNDRV_INFO_CONTENT_DATA &&
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entry->c.ops->write == NULL)) {
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err = -ENODEV;
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goto __error;
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}
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}
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data = kzalloc(sizeof(*data), GFP_KERNEL);
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if (data == NULL) {
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err = -ENOMEM;
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goto __error;
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}
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data->entry = entry;
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switch (entry->content) {
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case SNDRV_INFO_CONTENT_TEXT:
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if (mode == O_RDONLY || mode == O_RDWR) {
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buffer = kzalloc(sizeof(*buffer), GFP_KERNEL);
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if (buffer == NULL)
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goto __nomem;
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data->rbuffer = buffer;
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buffer->len = PAGE_SIZE;
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buffer->buffer = kmalloc(buffer->len, GFP_KERNEL);
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if (buffer->buffer == NULL)
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goto __nomem;
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}
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if (mode == O_WRONLY || mode == O_RDWR) {
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buffer = kzalloc(sizeof(*buffer), GFP_KERNEL);
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if (buffer == NULL)
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goto __nomem;
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data->wbuffer = buffer;
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buffer->len = PAGE_SIZE;
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buffer->buffer = kmalloc(buffer->len, GFP_KERNEL);
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if (buffer->buffer == NULL)
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goto __nomem;
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}
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break;
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case SNDRV_INFO_CONTENT_DATA: /* data */
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if (entry->c.ops->open) {
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if ((err = entry->c.ops->open(entry, mode,
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&data->file_private_data)) < 0) {
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kfree(data);
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goto __error;
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}
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}
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break;
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}
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file->private_data = data;
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mutex_unlock(&info_mutex);
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if (entry->content == SNDRV_INFO_CONTENT_TEXT &&
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(mode == O_RDONLY || mode == O_RDWR)) {
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if (entry->c.text.read) {
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mutex_lock(&entry->access);
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entry->c.text.read(entry, data->rbuffer);
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mutex_unlock(&entry->access);
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}
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}
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return 0;
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__nomem:
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if (data->rbuffer) {
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kfree(data->rbuffer->buffer);
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kfree(data->rbuffer);
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}
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if (data->wbuffer) {
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kfree(data->wbuffer->buffer);
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kfree(data->wbuffer);
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}
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kfree(data);
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err = -ENOMEM;
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__error:
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module_put(entry->module);
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__error1:
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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_entry *entry;
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struct snd_info_private_data *data;
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int mode;
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mode = file->f_flags & O_ACCMODE;
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data = file->private_data;
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entry = data->entry;
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switch (entry->content) {
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case SNDRV_INFO_CONTENT_TEXT:
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if (data->rbuffer) {
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kfree(data->rbuffer->buffer);
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kfree(data->rbuffer);
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}
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if (data->wbuffer) {
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if (entry->c.text.write) {
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entry->c.text.write(entry, data->wbuffer);
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if (data->wbuffer->error) {
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snd_printk(KERN_WARNING "data write error to %s (%i)\n",
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entry->name,
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data->wbuffer->error);
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}
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}
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kfree(data->wbuffer->buffer);
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kfree(data->wbuffer);
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}
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break;
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case SNDRV_INFO_CONTENT_DATA:
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if (entry->c.ops->release)
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entry->c.ops->release(entry, mode,
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data->file_private_data);
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break;
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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 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;
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struct snd_info_entry *entry;
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unsigned int mask;
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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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mask = 0;
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switch (entry->content) {
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case SNDRV_INFO_CONTENT_DATA:
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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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break;
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}
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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;
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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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switch (entry->content) {
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case SNDRV_INFO_CONTENT_DATA:
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if (entry->c.ops->ioctl)
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return entry->c.ops->ioctl(entry,
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data->file_private_data,
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file, cmd, arg);
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break;
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}
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return -ENOTTY;
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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->f_path.dentry->d_inode;
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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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switch (entry->content) {
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case SNDRV_INFO_CONTENT_DATA:
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if (entry->c.ops->mmap)
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return entry->c.ops->mmap(entry,
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data->file_private_data,
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inode, file, vma);
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break;
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}
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return -ENXIO;
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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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* snd_create_proc_entry - create a procfs entry
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* @name: the name of the proc file
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* @mode: the file permission bits, S_Ixxx
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* @parent: the parent proc-directory entry
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*
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* Creates a new proc file entry with the given name and permission
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* on the given directory.
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*
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* Returns the pointer of new instance or NULL on failure.
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*/
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static struct proc_dir_entry *snd_create_proc_entry(const char *name, mode_t mode,
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struct proc_dir_entry *parent)
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{
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struct proc_dir_entry *p;
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p = create_proc_entry(name, mode, parent);
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if (p)
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snd_info_entry_prepare(p);
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return p;
|
|
}
|
|
|
|
int __init snd_info_init(void)
|
|
{
|
|
struct proc_dir_entry *p;
|
|
|
|
p = snd_create_proc_entry("asound", S_IFDIR | S_IRUGO | S_IXUGO, &proc_root);
|
|
if (p == NULL)
|
|
return -ENOMEM;
|
|
snd_proc_root = p;
|
|
#ifdef CONFIG_SND_OSSEMUL
|
|
{
|
|
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 defined(CONFIG_SND_SEQUENCER) || defined(CONFIG_SND_SEQUENCER_MODULE)
|
|
{
|
|
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 defined(CONFIG_SND_SEQUENCER) || defined(CONFIG_SND_SEQUENCER_MODULE)
|
|
snd_info_free_entry(snd_seq_root);
|
|
#endif
|
|
#ifdef CONFIG_SND_OSSEMUL
|
|
snd_info_free_entry(snd_oss_root);
|
|
#endif
|
|
snd_remove_proc_entry(&proc_root, snd_proc_root);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
|
|
*/
|
|
|
|
|
|
/*
|
|
* create a card proc file
|
|
* called from init.c
|
|
*/
|
|
int snd_info_card_create(struct snd_card *card)
|
|
{
|
|
char str[8];
|
|
struct snd_info_entry *entry;
|
|
|
|
snd_assert(card != NULL, return -ENXIO);
|
|
|
|
sprintf(str, "card%i", card->number);
|
|
if ((entry = snd_info_create_module_entry(card->module, str, NULL)) == NULL)
|
|
return -ENOMEM;
|
|
entry->mode = S_IFDIR | S_IRUGO | S_IXUGO;
|
|
if (snd_info_register(entry) < 0) {
|
|
snd_info_free_entry(entry);
|
|
return -ENOMEM;
|
|
}
|
|
card->proc_root = entry;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* register the card proc file
|
|
* called from init.c
|
|
*/
|
|
int snd_info_card_register(struct snd_card *card)
|
|
{
|
|
struct proc_dir_entry *p;
|
|
|
|
snd_assert(card != NULL, return -ENXIO);
|
|
|
|
if (!strcmp(card->id, card->proc_root->name))
|
|
return 0;
|
|
|
|
p = proc_symlink(card->id, snd_proc_root, card->proc_root->name);
|
|
if (p == NULL)
|
|
return -ENOMEM;
|
|
card->proc_root_link = p;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* de-register the card proc file
|
|
* called from init.c
|
|
*/
|
|
void snd_info_card_disconnect(struct snd_card *card)
|
|
{
|
|
snd_assert(card != NULL, return);
|
|
mutex_lock(&info_mutex);
|
|
if (card->proc_root_link) {
|
|
snd_remove_proc_entry(snd_proc_root, card->proc_root_link);
|
|
card->proc_root_link = NULL;
|
|
}
|
|
if (card->proc_root)
|
|
snd_info_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)
|
|
{
|
|
snd_assert(card != NULL, return -ENXIO);
|
|
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 - 1
|
|
*
|
|
* Reads one line from the buffer and stores the string.
|
|
*
|
|
* Returns zero if successful, or 1 if error or EOF.
|
|
*/
|
|
int snd_info_get_line(struct snd_info_buffer *buffer, char *line, int len)
|
|
{
|
|
int c = -1;
|
|
|
|
if (len <= 0 || buffer->stop || buffer->error)
|
|
return 1;
|
|
while (--len > 0) {
|
|
c = buffer->buffer[buffer->curr++];
|
|
if (c == '\n') {
|
|
if (buffer->curr >= buffer->size)
|
|
buffer->stop = 1;
|
|
break;
|
|
}
|
|
*line++ = c;
|
|
if (buffer->curr >= buffer->size) {
|
|
buffer->stop = 1;
|
|
break;
|
|
}
|
|
}
|
|
while (c != '\n' && !buffer->stop) {
|
|
c = buffer->buffer[buffer->curr++];
|
|
if (buffer->curr >= buffer->size)
|
|
buffer->stop = 1;
|
|
}
|
|
*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.
|
|
*
|
|
* Returns the updated pointer of the original string so that
|
|
* it can be used for the next call.
|
|
*/
|
|
char *snd_info_get_str(char *dest, char *src, int len)
|
|
{
|
|
int c;
|
|
|
|
while (*src == ' ' || *src == '\t')
|
|
src++;
|
|
if (*src == '"' || *src == '\'') {
|
|
c = *src++;
|
|
while (--len > 0 && *src && *src != c) {
|
|
*dest++ = *src++;
|
|
}
|
|
if (*src == c)
|
|
src++;
|
|
} else {
|
|
while (--len > 0 && *src && *src != ' ' && *src != '\t') {
|
|
*dest++ = *src++;
|
|
}
|
|
}
|
|
*dest = 0;
|
|
while (*src == ' ' || *src == '\t')
|
|
src++;
|
|
return src;
|
|
}
|
|
|
|
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().
|
|
*
|
|
* Returns 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.
|
|
*
|
|
* Returns 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.
|
|
*
|
|
* Returns 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_assert(root, return);
|
|
snd_remove_proc_entry(root, 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().
|
|
*
|
|
* Returns 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.
|
|
*
|
|
* Returns 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;
|
|
|
|
snd_assert(entry != NULL, return -ENXIO);
|
|
root = entry->parent == NULL ? snd_proc_root : entry->parent->p;
|
|
mutex_lock(&info_mutex);
|
|
p = snd_create_proc_entry(entry->name, entry->mode, root);
|
|
if (!p) {
|
|
mutex_unlock(&info_mutex);
|
|
return -ENOMEM;
|
|
}
|
|
p->owner = entry->module;
|
|
if (!S_ISDIR(entry->mode))
|
|
p->proc_fops = &snd_info_entry_operations;
|
|
p->size = entry->size;
|
|
p->data = entry;
|
|
entry->p = p;
|
|
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 "
|
|
CONFIG_SND_VERSION CONFIG_SND_DATE ".\n"
|
|
);
|
|
}
|
|
|
|
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 */
|