1247 lines
33 KiB
C
1247 lines
33 KiB
C
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// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Digital Audio (PCM) abstract layer
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* Copyright (c) by Jaroslav Kysela <perex@perex.cz>
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*/
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/module.h>
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#include <linux/time.h>
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#include <linux/mutex.h>
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#include <linux/device.h>
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#include <linux/nospec.h>
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#include <sound/core.h>
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#include <sound/minors.h>
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#include <sound/pcm.h>
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#include <sound/timer.h>
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#include <sound/control.h>
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#include <sound/info.h>
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#include "pcm_local.h"
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MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>, Abramo Bagnara <abramo@alsa-project.org>");
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MODULE_DESCRIPTION("Midlevel PCM code for ALSA.");
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MODULE_LICENSE("GPL");
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static LIST_HEAD(snd_pcm_devices);
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static DEFINE_MUTEX(register_mutex);
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#if IS_ENABLED(CONFIG_SND_PCM_OSS)
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static LIST_HEAD(snd_pcm_notify_list);
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#endif
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static int snd_pcm_free(struct snd_pcm *pcm);
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static int snd_pcm_dev_free(struct snd_device *device);
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static int snd_pcm_dev_register(struct snd_device *device);
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static int snd_pcm_dev_disconnect(struct snd_device *device);
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static struct snd_pcm *snd_pcm_get(struct snd_card *card, int device)
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{
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struct snd_pcm *pcm;
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list_for_each_entry(pcm, &snd_pcm_devices, list) {
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if (pcm->card == card && pcm->device == device)
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return pcm;
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}
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return NULL;
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}
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static int snd_pcm_next(struct snd_card *card, int device)
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{
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struct snd_pcm *pcm;
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list_for_each_entry(pcm, &snd_pcm_devices, list) {
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if (pcm->card == card && pcm->device > device)
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return pcm->device;
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else if (pcm->card->number > card->number)
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return -1;
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}
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return -1;
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}
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static int snd_pcm_add(struct snd_pcm *newpcm)
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{
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struct snd_pcm *pcm;
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if (newpcm->internal)
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return 0;
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list_for_each_entry(pcm, &snd_pcm_devices, list) {
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if (pcm->card == newpcm->card && pcm->device == newpcm->device)
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return -EBUSY;
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if (pcm->card->number > newpcm->card->number ||
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(pcm->card == newpcm->card &&
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pcm->device > newpcm->device)) {
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list_add(&newpcm->list, pcm->list.prev);
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return 0;
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}
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}
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list_add_tail(&newpcm->list, &snd_pcm_devices);
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return 0;
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}
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static int snd_pcm_control_ioctl(struct snd_card *card,
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struct snd_ctl_file *control,
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unsigned int cmd, unsigned long arg)
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{
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switch (cmd) {
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case SNDRV_CTL_IOCTL_PCM_NEXT_DEVICE:
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{
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int device;
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if (get_user(device, (int __user *)arg))
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return -EFAULT;
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mutex_lock(®ister_mutex);
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device = snd_pcm_next(card, device);
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mutex_unlock(®ister_mutex);
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if (put_user(device, (int __user *)arg))
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return -EFAULT;
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return 0;
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}
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case SNDRV_CTL_IOCTL_PCM_INFO:
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{
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struct snd_pcm_info __user *info;
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unsigned int device, subdevice;
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int stream;
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struct snd_pcm *pcm;
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struct snd_pcm_str *pstr;
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struct snd_pcm_substream *substream;
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int err;
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info = (struct snd_pcm_info __user *)arg;
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if (get_user(device, &info->device))
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return -EFAULT;
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if (get_user(stream, &info->stream))
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return -EFAULT;
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if (stream < 0 || stream > 1)
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return -EINVAL;
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stream = array_index_nospec(stream, 2);
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if (get_user(subdevice, &info->subdevice))
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return -EFAULT;
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mutex_lock(®ister_mutex);
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pcm = snd_pcm_get(card, device);
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if (pcm == NULL) {
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err = -ENXIO;
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goto _error;
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}
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pstr = &pcm->streams[stream];
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if (pstr->substream_count == 0) {
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err = -ENOENT;
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goto _error;
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}
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if (subdevice >= pstr->substream_count) {
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err = -ENXIO;
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goto _error;
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}
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for (substream = pstr->substream; substream;
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substream = substream->next)
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if (substream->number == (int)subdevice)
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break;
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if (substream == NULL) {
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err = -ENXIO;
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goto _error;
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}
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mutex_lock(&pcm->open_mutex);
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err = snd_pcm_info_user(substream, info);
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mutex_unlock(&pcm->open_mutex);
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_error:
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mutex_unlock(®ister_mutex);
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return err;
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}
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case SNDRV_CTL_IOCTL_PCM_PREFER_SUBDEVICE:
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{
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int val;
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if (get_user(val, (int __user *)arg))
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return -EFAULT;
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control->preferred_subdevice[SND_CTL_SUBDEV_PCM] = val;
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return 0;
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}
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}
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return -ENOIOCTLCMD;
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}
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#define FORMAT(v) [SNDRV_PCM_FORMAT_##v] = #v
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static const char * const snd_pcm_format_names[] = {
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FORMAT(S8),
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FORMAT(U8),
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FORMAT(S16_LE),
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FORMAT(S16_BE),
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FORMAT(U16_LE),
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FORMAT(U16_BE),
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FORMAT(S24_LE),
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FORMAT(S24_BE),
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FORMAT(U24_LE),
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FORMAT(U24_BE),
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FORMAT(S32_LE),
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FORMAT(S32_BE),
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FORMAT(U32_LE),
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FORMAT(U32_BE),
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FORMAT(FLOAT_LE),
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FORMAT(FLOAT_BE),
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FORMAT(FLOAT64_LE),
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FORMAT(FLOAT64_BE),
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FORMAT(IEC958_SUBFRAME_LE),
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FORMAT(IEC958_SUBFRAME_BE),
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FORMAT(MU_LAW),
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FORMAT(A_LAW),
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FORMAT(IMA_ADPCM),
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FORMAT(MPEG),
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FORMAT(GSM),
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FORMAT(SPECIAL),
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FORMAT(S24_3LE),
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FORMAT(S24_3BE),
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FORMAT(U24_3LE),
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FORMAT(U24_3BE),
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FORMAT(S20_3LE),
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FORMAT(S20_3BE),
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FORMAT(U20_3LE),
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FORMAT(U20_3BE),
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FORMAT(S18_3LE),
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FORMAT(S18_3BE),
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FORMAT(U18_3LE),
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FORMAT(U18_3BE),
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FORMAT(G723_24),
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FORMAT(G723_24_1B),
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FORMAT(G723_40),
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FORMAT(G723_40_1B),
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FORMAT(DSD_U8),
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FORMAT(DSD_U16_LE),
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FORMAT(DSD_U32_LE),
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FORMAT(DSD_U16_BE),
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FORMAT(DSD_U32_BE),
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};
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/**
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* snd_pcm_format_name - Return a name string for the given PCM format
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* @format: PCM format
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*
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* Return: the format name string
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*/
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const char *snd_pcm_format_name(snd_pcm_format_t format)
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{
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if ((__force unsigned int)format >= ARRAY_SIZE(snd_pcm_format_names))
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return "Unknown";
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return snd_pcm_format_names[(__force unsigned int)format];
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}
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EXPORT_SYMBOL_GPL(snd_pcm_format_name);
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#ifdef CONFIG_SND_VERBOSE_PROCFS
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#define STATE(v) [SNDRV_PCM_STATE_##v] = #v
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#define STREAM(v) [SNDRV_PCM_STREAM_##v] = #v
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#define READY(v) [SNDRV_PCM_READY_##v] = #v
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#define XRUN(v) [SNDRV_PCM_XRUN_##v] = #v
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#define SILENCE(v) [SNDRV_PCM_SILENCE_##v] = #v
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#define TSTAMP(v) [SNDRV_PCM_TSTAMP_##v] = #v
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#define ACCESS(v) [SNDRV_PCM_ACCESS_##v] = #v
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#define START(v) [SNDRV_PCM_START_##v] = #v
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#define SUBFORMAT(v) [SNDRV_PCM_SUBFORMAT_##v] = #v
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static const char * const snd_pcm_stream_names[] = {
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STREAM(PLAYBACK),
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STREAM(CAPTURE),
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};
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static const char * const snd_pcm_state_names[] = {
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STATE(OPEN),
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STATE(SETUP),
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STATE(PREPARED),
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STATE(RUNNING),
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STATE(XRUN),
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STATE(DRAINING),
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STATE(PAUSED),
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STATE(SUSPENDED),
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};
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static const char * const snd_pcm_access_names[] = {
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ACCESS(MMAP_INTERLEAVED),
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ACCESS(MMAP_NONINTERLEAVED),
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ACCESS(MMAP_COMPLEX),
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ACCESS(RW_INTERLEAVED),
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ACCESS(RW_NONINTERLEAVED),
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};
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static const char * const snd_pcm_subformat_names[] = {
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SUBFORMAT(STD),
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};
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static const char * const snd_pcm_tstamp_mode_names[] = {
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TSTAMP(NONE),
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TSTAMP(ENABLE),
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};
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static const char *snd_pcm_stream_name(int stream)
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{
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return snd_pcm_stream_names[stream];
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}
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static const char *snd_pcm_access_name(snd_pcm_access_t access)
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{
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return snd_pcm_access_names[(__force int)access];
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}
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static const char *snd_pcm_subformat_name(snd_pcm_subformat_t subformat)
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{
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return snd_pcm_subformat_names[(__force int)subformat];
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}
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static const char *snd_pcm_tstamp_mode_name(int mode)
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{
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return snd_pcm_tstamp_mode_names[mode];
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}
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static const char *snd_pcm_state_name(snd_pcm_state_t state)
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{
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return snd_pcm_state_names[(__force int)state];
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}
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#if IS_ENABLED(CONFIG_SND_PCM_OSS)
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#include <linux/soundcard.h>
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||
|
|
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static const char *snd_pcm_oss_format_name(int format)
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{
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switch (format) {
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case AFMT_MU_LAW:
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return "MU_LAW";
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case AFMT_A_LAW:
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return "A_LAW";
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case AFMT_IMA_ADPCM:
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|
return "IMA_ADPCM";
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case AFMT_U8:
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return "U8";
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case AFMT_S16_LE:
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return "S16_LE";
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case AFMT_S16_BE:
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return "S16_BE";
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case AFMT_S8:
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return "S8";
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case AFMT_U16_LE:
|
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|
return "U16_LE";
|
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|
case AFMT_U16_BE:
|
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|
return "U16_BE";
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case AFMT_MPEG:
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return "MPEG";
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default:
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return "unknown";
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|
}
|
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|
}
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#endif
|
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|
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static void snd_pcm_proc_info_read(struct snd_pcm_substream *substream,
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struct snd_info_buffer *buffer)
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{
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struct snd_pcm_info *info;
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int err;
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||
|
|
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if (! substream)
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|
return;
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|
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info = kmalloc(sizeof(*info), GFP_KERNEL);
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if (!info)
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return;
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|
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|
err = snd_pcm_info(substream, info);
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|
if (err < 0) {
|
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|
snd_iprintf(buffer, "error %d\n", err);
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kfree(info);
|
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|
return;
|
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|
}
|
||
|
snd_iprintf(buffer, "card: %d\n", info->card);
|
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|
snd_iprintf(buffer, "device: %d\n", info->device);
|
||
|
snd_iprintf(buffer, "subdevice: %d\n", info->subdevice);
|
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|
snd_iprintf(buffer, "stream: %s\n", snd_pcm_stream_name(info->stream));
|
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snd_iprintf(buffer, "id: %s\n", info->id);
|
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|
snd_iprintf(buffer, "name: %s\n", info->name);
|
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|
snd_iprintf(buffer, "subname: %s\n", info->subname);
|
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|
snd_iprintf(buffer, "class: %d\n", info->dev_class);
|
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|
snd_iprintf(buffer, "subclass: %d\n", info->dev_subclass);
|
||
|
snd_iprintf(buffer, "subdevices_count: %d\n", info->subdevices_count);
|
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|
snd_iprintf(buffer, "subdevices_avail: %d\n", info->subdevices_avail);
|
||
|
kfree(info);
|
||
|
}
|
||
|
|
||
|
static void snd_pcm_stream_proc_info_read(struct snd_info_entry *entry,
|
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|
struct snd_info_buffer *buffer)
|
||
|
{
|
||
|
snd_pcm_proc_info_read(((struct snd_pcm_str *)entry->private_data)->substream,
|
||
|
buffer);
|
||
|
}
|
||
|
|
||
|
static void snd_pcm_substream_proc_info_read(struct snd_info_entry *entry,
|
||
|
struct snd_info_buffer *buffer)
|
||
|
{
|
||
|
snd_pcm_proc_info_read(entry->private_data, buffer);
|
||
|
}
|
||
|
|
||
|
static void snd_pcm_substream_proc_hw_params_read(struct snd_info_entry *entry,
|
||
|
struct snd_info_buffer *buffer)
|
||
|
{
|
||
|
struct snd_pcm_substream *substream = entry->private_data;
|
||
|
struct snd_pcm_runtime *runtime;
|
||
|
|
||
|
mutex_lock(&substream->pcm->open_mutex);
|
||
|
runtime = substream->runtime;
|
||
|
if (!runtime) {
|
||
|
snd_iprintf(buffer, "closed\n");
|
||
|
goto unlock;
|
||
|
}
|
||
|
if (runtime->state == SNDRV_PCM_STATE_OPEN) {
|
||
|
snd_iprintf(buffer, "no setup\n");
|
||
|
goto unlock;
|
||
|
}
|
||
|
snd_iprintf(buffer, "access: %s\n", snd_pcm_access_name(runtime->access));
|
||
|
snd_iprintf(buffer, "format: %s\n", snd_pcm_format_name(runtime->format));
|
||
|
snd_iprintf(buffer, "subformat: %s\n", snd_pcm_subformat_name(runtime->subformat));
|
||
|
snd_iprintf(buffer, "channels: %u\n", runtime->channels);
|
||
|
snd_iprintf(buffer, "rate: %u (%u/%u)\n", runtime->rate, runtime->rate_num, runtime->rate_den);
|
||
|
snd_iprintf(buffer, "period_size: %lu\n", runtime->period_size);
|
||
|
snd_iprintf(buffer, "buffer_size: %lu\n", runtime->buffer_size);
|
||
|
#if IS_ENABLED(CONFIG_SND_PCM_OSS)
|
||
|
if (substream->oss.oss) {
|
||
|
snd_iprintf(buffer, "OSS format: %s\n", snd_pcm_oss_format_name(runtime->oss.format));
|
||
|
snd_iprintf(buffer, "OSS channels: %u\n", runtime->oss.channels);
|
||
|
snd_iprintf(buffer, "OSS rate: %u\n", runtime->oss.rate);
|
||
|
snd_iprintf(buffer, "OSS period bytes: %lu\n", (unsigned long)runtime->oss.period_bytes);
|
||
|
snd_iprintf(buffer, "OSS periods: %u\n", runtime->oss.periods);
|
||
|
snd_iprintf(buffer, "OSS period frames: %lu\n", (unsigned long)runtime->oss.period_frames);
|
||
|
}
|
||
|
#endif
|
||
|
unlock:
|
||
|
mutex_unlock(&substream->pcm->open_mutex);
|
||
|
}
|
||
|
|
||
|
static void snd_pcm_substream_proc_sw_params_read(struct snd_info_entry *entry,
|
||
|
struct snd_info_buffer *buffer)
|
||
|
{
|
||
|
struct snd_pcm_substream *substream = entry->private_data;
|
||
|
struct snd_pcm_runtime *runtime;
|
||
|
|
||
|
mutex_lock(&substream->pcm->open_mutex);
|
||
|
runtime = substream->runtime;
|
||
|
if (!runtime) {
|
||
|
snd_iprintf(buffer, "closed\n");
|
||
|
goto unlock;
|
||
|
}
|
||
|
if (runtime->state == SNDRV_PCM_STATE_OPEN) {
|
||
|
snd_iprintf(buffer, "no setup\n");
|
||
|
goto unlock;
|
||
|
}
|
||
|
snd_iprintf(buffer, "tstamp_mode: %s\n", snd_pcm_tstamp_mode_name(runtime->tstamp_mode));
|
||
|
snd_iprintf(buffer, "period_step: %u\n", runtime->period_step);
|
||
|
snd_iprintf(buffer, "avail_min: %lu\n", runtime->control->avail_min);
|
||
|
snd_iprintf(buffer, "start_threshold: %lu\n", runtime->start_threshold);
|
||
|
snd_iprintf(buffer, "stop_threshold: %lu\n", runtime->stop_threshold);
|
||
|
snd_iprintf(buffer, "silence_threshold: %lu\n", runtime->silence_threshold);
|
||
|
snd_iprintf(buffer, "silence_size: %lu\n", runtime->silence_size);
|
||
|
snd_iprintf(buffer, "boundary: %lu\n", runtime->boundary);
|
||
|
unlock:
|
||
|
mutex_unlock(&substream->pcm->open_mutex);
|
||
|
}
|
||
|
|
||
|
static void snd_pcm_substream_proc_status_read(struct snd_info_entry *entry,
|
||
|
struct snd_info_buffer *buffer)
|
||
|
{
|
||
|
struct snd_pcm_substream *substream = entry->private_data;
|
||
|
struct snd_pcm_runtime *runtime;
|
||
|
struct snd_pcm_status64 status;
|
||
|
int err;
|
||
|
|
||
|
mutex_lock(&substream->pcm->open_mutex);
|
||
|
runtime = substream->runtime;
|
||
|
if (!runtime) {
|
||
|
snd_iprintf(buffer, "closed\n");
|
||
|
goto unlock;
|
||
|
}
|
||
|
memset(&status, 0, sizeof(status));
|
||
|
err = snd_pcm_status64(substream, &status);
|
||
|
if (err < 0) {
|
||
|
snd_iprintf(buffer, "error %d\n", err);
|
||
|
goto unlock;
|
||
|
}
|
||
|
snd_iprintf(buffer, "state: %s\n", snd_pcm_state_name(status.state));
|
||
|
snd_iprintf(buffer, "owner_pid : %d\n", pid_vnr(substream->pid));
|
||
|
snd_iprintf(buffer, "trigger_time: %lld.%09lld\n",
|
||
|
status.trigger_tstamp_sec, status.trigger_tstamp_nsec);
|
||
|
snd_iprintf(buffer, "tstamp : %lld.%09lld\n",
|
||
|
status.tstamp_sec, status.tstamp_nsec);
|
||
|
snd_iprintf(buffer, "delay : %ld\n", status.delay);
|
||
|
snd_iprintf(buffer, "avail : %ld\n", status.avail);
|
||
|
snd_iprintf(buffer, "avail_max : %ld\n", status.avail_max);
|
||
|
snd_iprintf(buffer, "-----\n");
|
||
|
snd_iprintf(buffer, "hw_ptr : %ld\n", runtime->status->hw_ptr);
|
||
|
snd_iprintf(buffer, "appl_ptr : %ld\n", runtime->control->appl_ptr);
|
||
|
unlock:
|
||
|
mutex_unlock(&substream->pcm->open_mutex);
|
||
|
}
|
||
|
|
||
|
#ifdef CONFIG_SND_PCM_XRUN_DEBUG
|
||
|
static void snd_pcm_xrun_injection_write(struct snd_info_entry *entry,
|
||
|
struct snd_info_buffer *buffer)
|
||
|
{
|
||
|
struct snd_pcm_substream *substream = entry->private_data;
|
||
|
|
||
|
snd_pcm_stop_xrun(substream);
|
||
|
}
|
||
|
|
||
|
static void snd_pcm_xrun_debug_read(struct snd_info_entry *entry,
|
||
|
struct snd_info_buffer *buffer)
|
||
|
{
|
||
|
struct snd_pcm_str *pstr = entry->private_data;
|
||
|
snd_iprintf(buffer, "%d\n", pstr->xrun_debug);
|
||
|
}
|
||
|
|
||
|
static void snd_pcm_xrun_debug_write(struct snd_info_entry *entry,
|
||
|
struct snd_info_buffer *buffer)
|
||
|
{
|
||
|
struct snd_pcm_str *pstr = entry->private_data;
|
||
|
char line[64];
|
||
|
if (!snd_info_get_line(buffer, line, sizeof(line)))
|
||
|
pstr->xrun_debug = simple_strtoul(line, NULL, 10);
|
||
|
}
|
||
|
#endif
|
||
|
|
||
|
static int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr)
|
||
|
{
|
||
|
struct snd_pcm *pcm = pstr->pcm;
|
||
|
struct snd_info_entry *entry;
|
||
|
char name[16];
|
||
|
|
||
|
sprintf(name, "pcm%i%c", pcm->device,
|
||
|
pstr->stream == SNDRV_PCM_STREAM_PLAYBACK ? 'p' : 'c');
|
||
|
entry = snd_info_create_card_entry(pcm->card, name,
|
||
|
pcm->card->proc_root);
|
||
|
if (!entry)
|
||
|
return -ENOMEM;
|
||
|
entry->mode = S_IFDIR | 0555;
|
||
|
pstr->proc_root = entry;
|
||
|
entry = snd_info_create_card_entry(pcm->card, "info", pstr->proc_root);
|
||
|
if (entry)
|
||
|
snd_info_set_text_ops(entry, pstr, snd_pcm_stream_proc_info_read);
|
||
|
#ifdef CONFIG_SND_PCM_XRUN_DEBUG
|
||
|
entry = snd_info_create_card_entry(pcm->card, "xrun_debug",
|
||
|
pstr->proc_root);
|
||
|
if (entry) {
|
||
|
snd_info_set_text_ops(entry, pstr, snd_pcm_xrun_debug_read);
|
||
|
entry->c.text.write = snd_pcm_xrun_debug_write;
|
||
|
entry->mode |= 0200;
|
||
|
}
|
||
|
#endif
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
static int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr)
|
||
|
{
|
||
|
snd_info_free_entry(pstr->proc_root);
|
||
|
pstr->proc_root = NULL;
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
static struct snd_info_entry *
|
||
|
create_substream_info_entry(struct snd_pcm_substream *substream,
|
||
|
const char *name,
|
||
|
void (*read)(struct snd_info_entry *,
|
||
|
struct snd_info_buffer *))
|
||
|
{
|
||
|
struct snd_info_entry *entry;
|
||
|
|
||
|
entry = snd_info_create_card_entry(substream->pcm->card, name,
|
||
|
substream->proc_root);
|
||
|
if (entry)
|
||
|
snd_info_set_text_ops(entry, substream, read);
|
||
|
return entry;
|
||
|
}
|
||
|
|
||
|
static int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream)
|
||
|
{
|
||
|
struct snd_info_entry *entry;
|
||
|
struct snd_card *card;
|
||
|
char name[16];
|
||
|
|
||
|
card = substream->pcm->card;
|
||
|
|
||
|
sprintf(name, "sub%i", substream->number);
|
||
|
entry = snd_info_create_card_entry(card, name,
|
||
|
substream->pstr->proc_root);
|
||
|
if (!entry)
|
||
|
return -ENOMEM;
|
||
|
entry->mode = S_IFDIR | 0555;
|
||
|
substream->proc_root = entry;
|
||
|
|
||
|
create_substream_info_entry(substream, "info",
|
||
|
snd_pcm_substream_proc_info_read);
|
||
|
create_substream_info_entry(substream, "hw_params",
|
||
|
snd_pcm_substream_proc_hw_params_read);
|
||
|
create_substream_info_entry(substream, "sw_params",
|
||
|
snd_pcm_substream_proc_sw_params_read);
|
||
|
create_substream_info_entry(substream, "status",
|
||
|
snd_pcm_substream_proc_status_read);
|
||
|
|
||
|
#ifdef CONFIG_SND_PCM_XRUN_DEBUG
|
||
|
entry = create_substream_info_entry(substream, "xrun_injection", NULL);
|
||
|
if (entry) {
|
||
|
entry->c.text.write = snd_pcm_xrun_injection_write;
|
||
|
entry->mode = S_IFREG | 0200;
|
||
|
}
|
||
|
#endif /* CONFIG_SND_PCM_XRUN_DEBUG */
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
#else /* !CONFIG_SND_VERBOSE_PROCFS */
|
||
|
static inline int snd_pcm_stream_proc_init(struct snd_pcm_str *pstr) { return 0; }
|
||
|
static inline int snd_pcm_stream_proc_done(struct snd_pcm_str *pstr) { return 0; }
|
||
|
static inline int snd_pcm_substream_proc_init(struct snd_pcm_substream *substream) { return 0; }
|
||
|
#endif /* CONFIG_SND_VERBOSE_PROCFS */
|
||
|
|
||
|
static const struct attribute_group *pcm_dev_attr_groups[];
|
||
|
|
||
|
/*
|
||
|
* PM callbacks: we need to deal only with suspend here, as the resume is
|
||
|
* triggered either from user-space or the driver's resume callback
|
||
|
*/
|
||
|
#ifdef CONFIG_PM_SLEEP
|
||
|
static int do_pcm_suspend(struct device *dev)
|
||
|
{
|
||
|
struct snd_pcm_str *pstr = container_of(dev, struct snd_pcm_str, dev);
|
||
|
|
||
|
if (!pstr->pcm->no_device_suspend)
|
||
|
snd_pcm_suspend_all(pstr->pcm);
|
||
|
return 0;
|
||
|
}
|
||
|
#endif
|
||
|
|
||
|
static const struct dev_pm_ops pcm_dev_pm_ops = {
|
||
|
SET_SYSTEM_SLEEP_PM_OPS(do_pcm_suspend, NULL)
|
||
|
};
|
||
|
|
||
|
/* device type for PCM -- basically only for passing PM callbacks */
|
||
|
static const struct device_type pcm_dev_type = {
|
||
|
.name = "pcm",
|
||
|
.pm = &pcm_dev_pm_ops,
|
||
|
};
|
||
|
|
||
|
/**
|
||
|
* snd_pcm_new_stream - create a new PCM stream
|
||
|
* @pcm: the pcm instance
|
||
|
* @stream: the stream direction, SNDRV_PCM_STREAM_XXX
|
||
|
* @substream_count: the number of substreams
|
||
|
*
|
||
|
* Creates a new stream for the pcm.
|
||
|
* The corresponding stream on the pcm must have been empty before
|
||
|
* calling this, i.e. zero must be given to the argument of
|
||
|
* snd_pcm_new().
|
||
|
*
|
||
|
* Return: Zero if successful, or a negative error code on failure.
|
||
|
*/
|
||
|
int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count)
|
||
|
{
|
||
|
int idx, err;
|
||
|
struct snd_pcm_str *pstr = &pcm->streams[stream];
|
||
|
struct snd_pcm_substream *substream, *prev;
|
||
|
|
||
|
#if IS_ENABLED(CONFIG_SND_PCM_OSS)
|
||
|
mutex_init(&pstr->oss.setup_mutex);
|
||
|
#endif
|
||
|
pstr->stream = stream;
|
||
|
pstr->pcm = pcm;
|
||
|
pstr->substream_count = substream_count;
|
||
|
if (!substream_count)
|
||
|
return 0;
|
||
|
|
||
|
snd_device_initialize(&pstr->dev, pcm->card);
|
||
|
pstr->dev.groups = pcm_dev_attr_groups;
|
||
|
pstr->dev.type = &pcm_dev_type;
|
||
|
dev_set_name(&pstr->dev, "pcmC%iD%i%c", pcm->card->number, pcm->device,
|
||
|
stream == SNDRV_PCM_STREAM_PLAYBACK ? 'p' : 'c');
|
||
|
|
||
|
if (!pcm->internal) {
|
||
|
err = snd_pcm_stream_proc_init(pstr);
|
||
|
if (err < 0) {
|
||
|
pcm_err(pcm, "Error in snd_pcm_stream_proc_init\n");
|
||
|
return err;
|
||
|
}
|
||
|
}
|
||
|
prev = NULL;
|
||
|
for (idx = 0, prev = NULL; idx < substream_count; idx++) {
|
||
|
substream = kzalloc(sizeof(*substream), GFP_KERNEL);
|
||
|
if (!substream)
|
||
|
return -ENOMEM;
|
||
|
substream->pcm = pcm;
|
||
|
substream->pstr = pstr;
|
||
|
substream->number = idx;
|
||
|
substream->stream = stream;
|
||
|
sprintf(substream->name, "subdevice #%i", idx);
|
||
|
substream->buffer_bytes_max = UINT_MAX;
|
||
|
if (prev == NULL)
|
||
|
pstr->substream = substream;
|
||
|
else
|
||
|
prev->next = substream;
|
||
|
|
||
|
if (!pcm->internal) {
|
||
|
err = snd_pcm_substream_proc_init(substream);
|
||
|
if (err < 0) {
|
||
|
pcm_err(pcm,
|
||
|
"Error in snd_pcm_stream_proc_init\n");
|
||
|
if (prev == NULL)
|
||
|
pstr->substream = NULL;
|
||
|
else
|
||
|
prev->next = NULL;
|
||
|
kfree(substream);
|
||
|
return err;
|
||
|
}
|
||
|
}
|
||
|
substream->group = &substream->self_group;
|
||
|
snd_pcm_group_init(&substream->self_group);
|
||
|
list_add_tail(&substream->link_list, &substream->self_group.substreams);
|
||
|
atomic_set(&substream->mmap_count, 0);
|
||
|
prev = substream;
|
||
|
}
|
||
|
return 0;
|
||
|
}
|
||
|
EXPORT_SYMBOL(snd_pcm_new_stream);
|
||
|
|
||
|
static int _snd_pcm_new(struct snd_card *card, const char *id, int device,
|
||
|
int playback_count, int capture_count, bool internal,
|
||
|
struct snd_pcm **rpcm)
|
||
|
{
|
||
|
struct snd_pcm *pcm;
|
||
|
int err;
|
||
|
static const struct snd_device_ops ops = {
|
||
|
.dev_free = snd_pcm_dev_free,
|
||
|
.dev_register = snd_pcm_dev_register,
|
||
|
.dev_disconnect = snd_pcm_dev_disconnect,
|
||
|
};
|
||
|
static const struct snd_device_ops internal_ops = {
|
||
|
.dev_free = snd_pcm_dev_free,
|
||
|
};
|
||
|
|
||
|
if (snd_BUG_ON(!card))
|
||
|
return -ENXIO;
|
||
|
if (rpcm)
|
||
|
*rpcm = NULL;
|
||
|
pcm = kzalloc(sizeof(*pcm), GFP_KERNEL);
|
||
|
if (!pcm)
|
||
|
return -ENOMEM;
|
||
|
pcm->card = card;
|
||
|
pcm->device = device;
|
||
|
pcm->internal = internal;
|
||
|
mutex_init(&pcm->open_mutex);
|
||
|
init_waitqueue_head(&pcm->open_wait);
|
||
|
INIT_LIST_HEAD(&pcm->list);
|
||
|
if (id)
|
||
|
strscpy(pcm->id, id, sizeof(pcm->id));
|
||
|
|
||
|
err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_PLAYBACK,
|
||
|
playback_count);
|
||
|
if (err < 0)
|
||
|
goto free_pcm;
|
||
|
|
||
|
err = snd_pcm_new_stream(pcm, SNDRV_PCM_STREAM_CAPTURE, capture_count);
|
||
|
if (err < 0)
|
||
|
goto free_pcm;
|
||
|
|
||
|
err = snd_device_new(card, SNDRV_DEV_PCM, pcm,
|
||
|
internal ? &internal_ops : &ops);
|
||
|
if (err < 0)
|
||
|
goto free_pcm;
|
||
|
|
||
|
if (rpcm)
|
||
|
*rpcm = pcm;
|
||
|
return 0;
|
||
|
|
||
|
free_pcm:
|
||
|
snd_pcm_free(pcm);
|
||
|
return err;
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* snd_pcm_new - create a new PCM instance
|
||
|
* @card: the card instance
|
||
|
* @id: the id string
|
||
|
* @device: the device index (zero based)
|
||
|
* @playback_count: the number of substreams for playback
|
||
|
* @capture_count: the number of substreams for capture
|
||
|
* @rpcm: the pointer to store the new pcm instance
|
||
|
*
|
||
|
* Creates a new PCM instance.
|
||
|
*
|
||
|
* The pcm operators have to be set afterwards to the new instance
|
||
|
* via snd_pcm_set_ops().
|
||
|
*
|
||
|
* Return: Zero if successful, or a negative error code on failure.
|
||
|
*/
|
||
|
int snd_pcm_new(struct snd_card *card, const char *id, int device,
|
||
|
int playback_count, int capture_count, struct snd_pcm **rpcm)
|
||
|
{
|
||
|
return _snd_pcm_new(card, id, device, playback_count, capture_count,
|
||
|
false, rpcm);
|
||
|
}
|
||
|
EXPORT_SYMBOL(snd_pcm_new);
|
||
|
|
||
|
/**
|
||
|
* snd_pcm_new_internal - create a new internal PCM instance
|
||
|
* @card: the card instance
|
||
|
* @id: the id string
|
||
|
* @device: the device index (zero based - shared with normal PCMs)
|
||
|
* @playback_count: the number of substreams for playback
|
||
|
* @capture_count: the number of substreams for capture
|
||
|
* @rpcm: the pointer to store the new pcm instance
|
||
|
*
|
||
|
* Creates a new internal PCM instance with no userspace device or procfs
|
||
|
* entries. This is used by ASoC Back End PCMs in order to create a PCM that
|
||
|
* will only be used internally by kernel drivers. i.e. it cannot be opened
|
||
|
* by userspace. It provides existing ASoC components drivers with a substream
|
||
|
* and access to any private data.
|
||
|
*
|
||
|
* The pcm operators have to be set afterwards to the new instance
|
||
|
* via snd_pcm_set_ops().
|
||
|
*
|
||
|
* Return: Zero if successful, or a negative error code on failure.
|
||
|
*/
|
||
|
int snd_pcm_new_internal(struct snd_card *card, const char *id, int device,
|
||
|
int playback_count, int capture_count,
|
||
|
struct snd_pcm **rpcm)
|
||
|
{
|
||
|
return _snd_pcm_new(card, id, device, playback_count, capture_count,
|
||
|
true, rpcm);
|
||
|
}
|
||
|
EXPORT_SYMBOL(snd_pcm_new_internal);
|
||
|
|
||
|
static void free_chmap(struct snd_pcm_str *pstr)
|
||
|
{
|
||
|
if (pstr->chmap_kctl) {
|
||
|
struct snd_card *card = pstr->pcm->card;
|
||
|
|
||
|
down_write(&card->controls_rwsem);
|
||
|
snd_ctl_remove(card, pstr->chmap_kctl);
|
||
|
up_write(&card->controls_rwsem);
|
||
|
pstr->chmap_kctl = NULL;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
static void snd_pcm_free_stream(struct snd_pcm_str * pstr)
|
||
|
{
|
||
|
struct snd_pcm_substream *substream, *substream_next;
|
||
|
#if IS_ENABLED(CONFIG_SND_PCM_OSS)
|
||
|
struct snd_pcm_oss_setup *setup, *setupn;
|
||
|
#endif
|
||
|
|
||
|
/* free all proc files under the stream */
|
||
|
snd_pcm_stream_proc_done(pstr);
|
||
|
|
||
|
substream = pstr->substream;
|
||
|
while (substream) {
|
||
|
substream_next = substream->next;
|
||
|
snd_pcm_timer_done(substream);
|
||
|
kfree(substream);
|
||
|
substream = substream_next;
|
||
|
}
|
||
|
#if IS_ENABLED(CONFIG_SND_PCM_OSS)
|
||
|
for (setup = pstr->oss.setup_list; setup; setup = setupn) {
|
||
|
setupn = setup->next;
|
||
|
kfree(setup->task_name);
|
||
|
kfree(setup);
|
||
|
}
|
||
|
#endif
|
||
|
free_chmap(pstr);
|
||
|
if (pstr->substream_count)
|
||
|
put_device(&pstr->dev);
|
||
|
}
|
||
|
|
||
|
#if IS_ENABLED(CONFIG_SND_PCM_OSS)
|
||
|
#define pcm_call_notify(pcm, call) \
|
||
|
do { \
|
||
|
struct snd_pcm_notify *_notify; \
|
||
|
list_for_each_entry(_notify, &snd_pcm_notify_list, list) \
|
||
|
_notify->call(pcm); \
|
||
|
} while (0)
|
||
|
#else
|
||
|
#define pcm_call_notify(pcm, call) do {} while (0)
|
||
|
#endif
|
||
|
|
||
|
static int snd_pcm_free(struct snd_pcm *pcm)
|
||
|
{
|
||
|
if (!pcm)
|
||
|
return 0;
|
||
|
if (!pcm->internal)
|
||
|
pcm_call_notify(pcm, n_unregister);
|
||
|
if (pcm->private_free)
|
||
|
pcm->private_free(pcm);
|
||
|
snd_pcm_lib_preallocate_free_for_all(pcm);
|
||
|
snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_PLAYBACK]);
|
||
|
snd_pcm_free_stream(&pcm->streams[SNDRV_PCM_STREAM_CAPTURE]);
|
||
|
kfree(pcm);
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
static int snd_pcm_dev_free(struct snd_device *device)
|
||
|
{
|
||
|
struct snd_pcm *pcm = device->device_data;
|
||
|
return snd_pcm_free(pcm);
|
||
|
}
|
||
|
|
||
|
int snd_pcm_attach_substream(struct snd_pcm *pcm, int stream,
|
||
|
struct file *file,
|
||
|
struct snd_pcm_substream **rsubstream)
|
||
|
{
|
||
|
struct snd_pcm_str * pstr;
|
||
|
struct snd_pcm_substream *substream;
|
||
|
struct snd_pcm_runtime *runtime;
|
||
|
struct snd_card *card;
|
||
|
int prefer_subdevice;
|
||
|
size_t size;
|
||
|
|
||
|
if (snd_BUG_ON(!pcm || !rsubstream))
|
||
|
return -ENXIO;
|
||
|
if (snd_BUG_ON(stream != SNDRV_PCM_STREAM_PLAYBACK &&
|
||
|
stream != SNDRV_PCM_STREAM_CAPTURE))
|
||
|
return -EINVAL;
|
||
|
*rsubstream = NULL;
|
||
|
pstr = &pcm->streams[stream];
|
||
|
if (pstr->substream == NULL || pstr->substream_count == 0)
|
||
|
return -ENODEV;
|
||
|
|
||
|
card = pcm->card;
|
||
|
prefer_subdevice = snd_ctl_get_preferred_subdevice(card, SND_CTL_SUBDEV_PCM);
|
||
|
|
||
|
if (pcm->info_flags & SNDRV_PCM_INFO_HALF_DUPLEX) {
|
||
|
int opposite = !stream;
|
||
|
|
||
|
for (substream = pcm->streams[opposite].substream; substream;
|
||
|
substream = substream->next) {
|
||
|
if (SUBSTREAM_BUSY(substream))
|
||
|
return -EAGAIN;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
if (file->f_flags & O_APPEND) {
|
||
|
if (prefer_subdevice < 0) {
|
||
|
if (pstr->substream_count > 1)
|
||
|
return -EINVAL; /* must be unique */
|
||
|
substream = pstr->substream;
|
||
|
} else {
|
||
|
for (substream = pstr->substream; substream;
|
||
|
substream = substream->next)
|
||
|
if (substream->number == prefer_subdevice)
|
||
|
break;
|
||
|
}
|
||
|
if (! substream)
|
||
|
return -ENODEV;
|
||
|
if (! SUBSTREAM_BUSY(substream))
|
||
|
return -EBADFD;
|
||
|
substream->ref_count++;
|
||
|
*rsubstream = substream;
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
for (substream = pstr->substream; substream; substream = substream->next) {
|
||
|
if (!SUBSTREAM_BUSY(substream) &&
|
||
|
(prefer_subdevice == -1 ||
|
||
|
substream->number == prefer_subdevice))
|
||
|
break;
|
||
|
}
|
||
|
if (substream == NULL)
|
||
|
return -EAGAIN;
|
||
|
|
||
|
runtime = kzalloc(sizeof(*runtime), GFP_KERNEL);
|
||
|
if (runtime == NULL)
|
||
|
return -ENOMEM;
|
||
|
|
||
|
size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status));
|
||
|
runtime->status = alloc_pages_exact(size, GFP_KERNEL);
|
||
|
if (runtime->status == NULL) {
|
||
|
kfree(runtime);
|
||
|
return -ENOMEM;
|
||
|
}
|
||
|
memset(runtime->status, 0, size);
|
||
|
|
||
|
size = PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control));
|
||
|
runtime->control = alloc_pages_exact(size, GFP_KERNEL);
|
||
|
if (runtime->control == NULL) {
|
||
|
free_pages_exact(runtime->status,
|
||
|
PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)));
|
||
|
kfree(runtime);
|
||
|
return -ENOMEM;
|
||
|
}
|
||
|
memset(runtime->control, 0, size);
|
||
|
|
||
|
init_waitqueue_head(&runtime->sleep);
|
||
|
init_waitqueue_head(&runtime->tsleep);
|
||
|
|
||
|
__snd_pcm_set_state(runtime, SNDRV_PCM_STATE_OPEN);
|
||
|
mutex_init(&runtime->buffer_mutex);
|
||
|
atomic_set(&runtime->buffer_accessing, 0);
|
||
|
|
||
|
substream->runtime = runtime;
|
||
|
substream->private_data = pcm->private_data;
|
||
|
substream->ref_count = 1;
|
||
|
substream->f_flags = file->f_flags;
|
||
|
substream->pid = get_pid(task_pid(current));
|
||
|
pstr->substream_opened++;
|
||
|
*rsubstream = substream;
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
void snd_pcm_detach_substream(struct snd_pcm_substream *substream)
|
||
|
{
|
||
|
struct snd_pcm_runtime *runtime;
|
||
|
|
||
|
if (PCM_RUNTIME_CHECK(substream))
|
||
|
return;
|
||
|
runtime = substream->runtime;
|
||
|
if (runtime->private_free != NULL)
|
||
|
runtime->private_free(runtime);
|
||
|
free_pages_exact(runtime->status,
|
||
|
PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)));
|
||
|
free_pages_exact(runtime->control,
|
||
|
PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)));
|
||
|
kfree(runtime->hw_constraints.rules);
|
||
|
/* Avoid concurrent access to runtime via PCM timer interface */
|
||
|
if (substream->timer) {
|
||
|
spin_lock_irq(&substream->timer->lock);
|
||
|
substream->runtime = NULL;
|
||
|
spin_unlock_irq(&substream->timer->lock);
|
||
|
} else {
|
||
|
substream->runtime = NULL;
|
||
|
}
|
||
|
mutex_destroy(&runtime->buffer_mutex);
|
||
|
snd_fasync_free(runtime->fasync);
|
||
|
kfree(runtime);
|
||
|
put_pid(substream->pid);
|
||
|
substream->pid = NULL;
|
||
|
substream->pstr->substream_opened--;
|
||
|
}
|
||
|
|
||
|
static ssize_t pcm_class_show(struct device *dev,
|
||
|
struct device_attribute *attr, char *buf)
|
||
|
{
|
||
|
struct snd_pcm_str *pstr = container_of(dev, struct snd_pcm_str, dev);
|
||
|
struct snd_pcm *pcm = pstr->pcm;
|
||
|
const char *str;
|
||
|
static const char *strs[SNDRV_PCM_CLASS_LAST + 1] = {
|
||
|
[SNDRV_PCM_CLASS_GENERIC] = "generic",
|
||
|
[SNDRV_PCM_CLASS_MULTI] = "multi",
|
||
|
[SNDRV_PCM_CLASS_MODEM] = "modem",
|
||
|
[SNDRV_PCM_CLASS_DIGITIZER] = "digitizer",
|
||
|
};
|
||
|
|
||
|
if (pcm->dev_class > SNDRV_PCM_CLASS_LAST)
|
||
|
str = "none";
|
||
|
else
|
||
|
str = strs[pcm->dev_class];
|
||
|
return sysfs_emit(buf, "%s\n", str);
|
||
|
}
|
||
|
|
||
|
static DEVICE_ATTR_RO(pcm_class);
|
||
|
static struct attribute *pcm_dev_attrs[] = {
|
||
|
&dev_attr_pcm_class.attr,
|
||
|
NULL
|
||
|
};
|
||
|
|
||
|
static const struct attribute_group pcm_dev_attr_group = {
|
||
|
.attrs = pcm_dev_attrs,
|
||
|
};
|
||
|
|
||
|
static const struct attribute_group *pcm_dev_attr_groups[] = {
|
||
|
&pcm_dev_attr_group,
|
||
|
NULL
|
||
|
};
|
||
|
|
||
|
static int snd_pcm_dev_register(struct snd_device *device)
|
||
|
{
|
||
|
int cidx, err;
|
||
|
struct snd_pcm_substream *substream;
|
||
|
struct snd_pcm *pcm;
|
||
|
|
||
|
if (snd_BUG_ON(!device || !device->device_data))
|
||
|
return -ENXIO;
|
||
|
pcm = device->device_data;
|
||
|
|
||
|
mutex_lock(®ister_mutex);
|
||
|
err = snd_pcm_add(pcm);
|
||
|
if (err)
|
||
|
goto unlock;
|
||
|
for (cidx = 0; cidx < 2; cidx++) {
|
||
|
int devtype = -1;
|
||
|
if (pcm->streams[cidx].substream == NULL)
|
||
|
continue;
|
||
|
switch (cidx) {
|
||
|
case SNDRV_PCM_STREAM_PLAYBACK:
|
||
|
devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK;
|
||
|
break;
|
||
|
case SNDRV_PCM_STREAM_CAPTURE:
|
||
|
devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE;
|
||
|
break;
|
||
|
}
|
||
|
/* register pcm */
|
||
|
err = snd_register_device(devtype, pcm->card, pcm->device,
|
||
|
&snd_pcm_f_ops[cidx], pcm,
|
||
|
&pcm->streams[cidx].dev);
|
||
|
if (err < 0) {
|
||
|
list_del_init(&pcm->list);
|
||
|
goto unlock;
|
||
|
}
|
||
|
|
||
|
for (substream = pcm->streams[cidx].substream; substream; substream = substream->next)
|
||
|
snd_pcm_timer_init(substream);
|
||
|
}
|
||
|
|
||
|
pcm_call_notify(pcm, n_register);
|
||
|
|
||
|
unlock:
|
||
|
mutex_unlock(®ister_mutex);
|
||
|
return err;
|
||
|
}
|
||
|
|
||
|
static int snd_pcm_dev_disconnect(struct snd_device *device)
|
||
|
{
|
||
|
struct snd_pcm *pcm = device->device_data;
|
||
|
struct snd_pcm_substream *substream;
|
||
|
int cidx;
|
||
|
|
||
|
mutex_lock(®ister_mutex);
|
||
|
mutex_lock(&pcm->open_mutex);
|
||
|
wake_up(&pcm->open_wait);
|
||
|
list_del_init(&pcm->list);
|
||
|
|
||
|
for_each_pcm_substream(pcm, cidx, substream) {
|
||
|
snd_pcm_stream_lock_irq(substream);
|
||
|
if (substream->runtime) {
|
||
|
if (snd_pcm_running(substream))
|
||
|
snd_pcm_stop(substream, SNDRV_PCM_STATE_DISCONNECTED);
|
||
|
/* to be sure, set the state unconditionally */
|
||
|
__snd_pcm_set_state(substream->runtime,
|
||
|
SNDRV_PCM_STATE_DISCONNECTED);
|
||
|
wake_up(&substream->runtime->sleep);
|
||
|
wake_up(&substream->runtime->tsleep);
|
||
|
}
|
||
|
snd_pcm_stream_unlock_irq(substream);
|
||
|
}
|
||
|
|
||
|
for_each_pcm_substream(pcm, cidx, substream)
|
||
|
snd_pcm_sync_stop(substream, false);
|
||
|
|
||
|
pcm_call_notify(pcm, n_disconnect);
|
||
|
for (cidx = 0; cidx < 2; cidx++) {
|
||
|
snd_unregister_device(&pcm->streams[cidx].dev);
|
||
|
free_chmap(&pcm->streams[cidx]);
|
||
|
}
|
||
|
mutex_unlock(&pcm->open_mutex);
|
||
|
mutex_unlock(®ister_mutex);
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
#if IS_ENABLED(CONFIG_SND_PCM_OSS)
|
||
|
/**
|
||
|
* snd_pcm_notify - Add/remove the notify list
|
||
|
* @notify: PCM notify list
|
||
|
* @nfree: 0 = register, 1 = unregister
|
||
|
*
|
||
|
* This adds the given notifier to the global list so that the callback is
|
||
|
* called for each registered PCM devices. This exists only for PCM OSS
|
||
|
* emulation, so far.
|
||
|
*
|
||
|
* Return: zero if successful, or a negative error code
|
||
|
*/
|
||
|
int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree)
|
||
|
{
|
||
|
struct snd_pcm *pcm;
|
||
|
|
||
|
if (snd_BUG_ON(!notify ||
|
||
|
!notify->n_register ||
|
||
|
!notify->n_unregister ||
|
||
|
!notify->n_disconnect))
|
||
|
return -EINVAL;
|
||
|
mutex_lock(®ister_mutex);
|
||
|
if (nfree) {
|
||
|
list_del(¬ify->list);
|
||
|
list_for_each_entry(pcm, &snd_pcm_devices, list)
|
||
|
notify->n_unregister(pcm);
|
||
|
} else {
|
||
|
list_add_tail(¬ify->list, &snd_pcm_notify_list);
|
||
|
list_for_each_entry(pcm, &snd_pcm_devices, list)
|
||
|
notify->n_register(pcm);
|
||
|
}
|
||
|
mutex_unlock(®ister_mutex);
|
||
|
return 0;
|
||
|
}
|
||
|
EXPORT_SYMBOL(snd_pcm_notify);
|
||
|
#endif /* CONFIG_SND_PCM_OSS */
|
||
|
|
||
|
#ifdef CONFIG_SND_PROC_FS
|
||
|
/*
|
||
|
* Info interface
|
||
|
*/
|
||
|
|
||
|
static void snd_pcm_proc_read(struct snd_info_entry *entry,
|
||
|
struct snd_info_buffer *buffer)
|
||
|
{
|
||
|
struct snd_pcm *pcm;
|
||
|
|
||
|
mutex_lock(®ister_mutex);
|
||
|
list_for_each_entry(pcm, &snd_pcm_devices, list) {
|
||
|
snd_iprintf(buffer, "%02i-%02i: %s : %s",
|
||
|
pcm->card->number, pcm->device, pcm->id, pcm->name);
|
||
|
if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream)
|
||
|
snd_iprintf(buffer, " : playback %i",
|
||
|
pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream_count);
|
||
|
if (pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream)
|
||
|
snd_iprintf(buffer, " : capture %i",
|
||
|
pcm->streams[SNDRV_PCM_STREAM_CAPTURE].substream_count);
|
||
|
snd_iprintf(buffer, "\n");
|
||
|
}
|
||
|
mutex_unlock(®ister_mutex);
|
||
|
}
|
||
|
|
||
|
static struct snd_info_entry *snd_pcm_proc_entry;
|
||
|
|
||
|
static void snd_pcm_proc_init(void)
|
||
|
{
|
||
|
struct snd_info_entry *entry;
|
||
|
|
||
|
entry = snd_info_create_module_entry(THIS_MODULE, "pcm", NULL);
|
||
|
if (entry) {
|
||
|
snd_info_set_text_ops(entry, NULL, snd_pcm_proc_read);
|
||
|
if (snd_info_register(entry) < 0) {
|
||
|
snd_info_free_entry(entry);
|
||
|
entry = NULL;
|
||
|
}
|
||
|
}
|
||
|
snd_pcm_proc_entry = entry;
|
||
|
}
|
||
|
|
||
|
static void snd_pcm_proc_done(void)
|
||
|
{
|
||
|
snd_info_free_entry(snd_pcm_proc_entry);
|
||
|
}
|
||
|
|
||
|
#else /* !CONFIG_SND_PROC_FS */
|
||
|
#define snd_pcm_proc_init()
|
||
|
#define snd_pcm_proc_done()
|
||
|
#endif /* CONFIG_SND_PROC_FS */
|
||
|
|
||
|
|
||
|
/*
|
||
|
* ENTRY functions
|
||
|
*/
|
||
|
|
||
|
static int __init alsa_pcm_init(void)
|
||
|
{
|
||
|
snd_ctl_register_ioctl(snd_pcm_control_ioctl);
|
||
|
snd_ctl_register_ioctl_compat(snd_pcm_control_ioctl);
|
||
|
snd_pcm_proc_init();
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
static void __exit alsa_pcm_exit(void)
|
||
|
{
|
||
|
snd_ctl_unregister_ioctl(snd_pcm_control_ioctl);
|
||
|
snd_ctl_unregister_ioctl_compat(snd_pcm_control_ioctl);
|
||
|
snd_pcm_proc_done();
|
||
|
}
|
||
|
|
||
|
module_init(alsa_pcm_init)
|
||
|
module_exit(alsa_pcm_exit)
|