korg/linux
0
0
Fork 0
mirror of https://mirrors.bfsu.edu.cn/git/linux.git synced 2024-11-25 05:04:09 +08:00
Code Issues Packages Projects Releases Wiki Activity

ALSA: aloop: Use callback functions for timer specific implementations

Browse Source 
This commit only refactors the implementation. It does not change the
behaviour.
It is required to support other timers (e.g sound timer).

Signed-off-by: Timo Wischer <twischer@de.adit-jv.com>
Signed-off-by: Andrew Gabbasov <andrew_gabbasov@mentor.com>
Link: https://lore.kernel.org/r/20191120174955.6410-4-andrew_gabbasov@mentor.com
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Timo Wischer 2019-11-20 11:49:51 -06:00 committed by Takashi Iwai
parent 09419f1ace
commit 133f37593e
1 changed files with 94 additions and 19 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

113
sound/drivers/aloop.c
View File

@ -55,8 +55,39 @@ MODULE_PARM_DESC(pcm_notify, "Break capture when PCM format/rate/channels change
#define NO_PITCH 100000
struct loopback_cable;
struct loopback_pcm;
struct loopback_ops {
/* optional
* call in loopback->cable_lock
*/
int (*open)(struct loopback_pcm *dpcm);
/* required
* call in cable->lock
*/
int (*start)(struct loopback_pcm *dpcm);
/* required
* call in cable->lock
*/
int (*stop)(struct loopback_pcm *dpcm);
/* optional */
int (*stop_sync)(struct loopback_pcm *dpcm);
/* optional */
int (*close_substream)(struct loopback_pcm *dpcm);
/* optional
* call in loopback->cable_lock
*/
int (*close_cable)(struct loopback_pcm *dpcm);
/* optional
* call in cable->lock
*/
unsigned int (*pos_update)(struct loopback_cable *cable);
/* optional */
void (*dpcm_info)(struct loopback_pcm *dpcm,
struct snd_info_buffer *buffer);
};
struct loopback_cable {
spinlock_t lock;
struct loopback_pcm *streams[2];
@ -65,6 +96,8 @@ struct loopback_cable {
unsigned int valid;
unsigned int running;
unsigned int pause;
/* timer specific */
struct loopback_ops *ops;
};
struct loopback_setup {
@ -270,7 +303,7 @@ static int loopback_trigger(struct snd_pcm_substream *substream, int cmd)
spin_lock(&cable->lock);
cable->running |= stream;
cable->pause &= ~stream;
err = loopback_timer_start(dpcm);
err = cable->ops->start(dpcm);
spin_unlock(&cable->lock);
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
loopback_active_notify(dpcm);
@ -279,7 +312,7 @@ static int loopback_trigger(struct snd_pcm_substream *substream, int cmd)
spin_lock(&cable->lock);
cable->running &= ~stream;
cable->pause &= ~stream;
err = loopback_timer_stop(dpcm);
err = cable->ops->stop(dpcm);
spin_unlock(&cable->lock);
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
loopback_active_notify(dpcm);
@ -288,7 +321,7 @@ static int loopback_trigger(struct snd_pcm_substream *substream, int cmd)
case SNDRV_PCM_TRIGGER_SUSPEND:
spin_lock(&cable->lock);
cable->pause |= stream;
err = loopback_timer_stop(dpcm);
err = cable->ops->stop(dpcm);
spin_unlock(&cable->lock);
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
loopback_active_notify(dpcm);
@ -298,7 +331,7 @@ static int loopback_trigger(struct snd_pcm_substream *substream, int cmd)
spin_lock(&cable->lock);
dpcm->last_jiffies = jiffies;
cable->pause &= ~stream;
err = loopback_timer_start(dpcm);
err = cable->ops->start(dpcm);
spin_unlock(&cable->lock);
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
loopback_active_notify(dpcm);
@ -329,9 +362,11 @@ static int loopback_prepare(struct snd_pcm_substream *substream)
struct loopback_cable *cable = dpcm->cable;
int err, bps, salign;
err = loopback_timer_stop_sync(dpcm);
if (err < 0)
return err;
if (cable->ops->stop_sync) {
err = cable->ops->stop_sync(dpcm);
if (err < 0)
return err;
}
salign = (snd_pcm_format_physical_width(runtime->format) *
runtime->channels) / 8;
@ -539,6 +574,18 @@ static void loopback_timer_function(struct timer_list *t)
spin_unlock_irqrestore(&dpcm->cable->lock, flags);
}
static void loopback_jiffies_timer_dpcm_info(struct loopback_pcm *dpcm,
struct snd_info_buffer *buffer)
{
snd_iprintf(buffer, " update_pending:\t%u\n",
dpcm->period_update_pending);
snd_iprintf(buffer, " irq_pos:\t\t%u\n", dpcm->irq_pos);
snd_iprintf(buffer, " period_frac:\t%u\n", dpcm->period_size_frac);
snd_iprintf(buffer, " last_jiffies:\t%lu (%lu)\n",
dpcm->last_jiffies, jiffies);
snd_iprintf(buffer, " timer_expires:\t%lu\n", dpcm->timer.expires);
}
static snd_pcm_uframes_t loopback_pointer(struct snd_pcm_substream *substream)
{
struct snd_pcm_runtime *runtime = substream->runtime;
@ -546,7 +593,8 @@ static snd_pcm_uframes_t loopback_pointer(struct snd_pcm_substream *substream)
snd_pcm_uframes_t pos;
spin_lock(&dpcm->cable->lock);
loopback_pos_update(dpcm->cable);
if (dpcm->cable->ops->pos_update)
dpcm->cable->ops->pos_update(dpcm->cable);
pos = dpcm->buf_pos;
spin_unlock(&dpcm->cable->lock);
return bytes_to_frames(runtime, pos);
@ -671,12 +719,33 @@ static void free_cable(struct snd_pcm_substream *substream)
cable->streams[substream->stream] = NULL;
spin_unlock_irq(&cable->lock);
} else {
struct loopback_pcm *dpcm = substream->runtime->private_data;
if (cable->ops && cable->ops->close_cable && dpcm)
cable->ops->close_cable(dpcm);
/* free the cable */
loopback->cables[substream->number][dev] = NULL;
kfree(cable);
}
}
static int loopback_jiffies_timer_open(struct loopback_pcm *dpcm)
{
timer_setup(&dpcm->timer, loopback_timer_function, 0);
return 0;
}
static struct loopback_ops loopback_jiffies_timer_ops = {
.open = loopback_jiffies_timer_open,
.start = loopback_timer_start,
.stop = loopback_timer_stop,
.stop_sync = loopback_timer_stop_sync,
.close_substream = loopback_timer_stop_sync,
.pos_update = loopback_pos_update,
.dpcm_info = loopback_jiffies_timer_dpcm_info,
};
static int loopback_open(struct snd_pcm_substream *substream)
{
struct snd_pcm_runtime *runtime = substream->runtime;
@ -694,7 +763,6 @@ static int loopback_open(struct snd_pcm_substream *substream)
}
dpcm->loopback = loopback;
dpcm->substream = substream;
timer_setup(&dpcm->timer, loopback_timer_function, 0);
cable = loopback->cables[substream->number][dev];
if (!cable) {
@ -705,9 +773,17 @@ static int loopback_open(struct snd_pcm_substream *substream)
}
spin_lock_init(&cable->lock);
cable->hw = loopback_pcm_hardware;
cable->ops = &loopback_jiffies_timer_ops;
loopback->cables[substream->number][dev] = cable;
}
dpcm->cable = cable;
runtime->private_data = dpcm;
if (cable->ops->open) {
err = cable->ops->open(dpcm);
if (err < 0)
goto unlock;
}
snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
@ -733,7 +809,9 @@ static int loopback_open(struct snd_pcm_substream *substream)
if (err < 0)
goto unlock;
runtime->private_data = dpcm;
/* loopback_runtime_free() has not to be called if kfree(dpcm) was
* already called here. Otherwise it will end up with a double free.
*/
runtime->private_free = loopback_runtime_free;
if (get_notify(dpcm))
runtime->hw = loopback_pcm_hardware;
@ -757,12 +835,14 @@ static int loopback_close(struct snd_pcm_substream *substream)
{
struct loopback *loopback = substream->private_data;
struct loopback_pcm *dpcm = substream->runtime->private_data;
int err = 0;
loopback_timer_stop_sync(dpcm);
if (dpcm->cable->ops->close_substream)
err = dpcm->cable->ops->close_substream(dpcm);
mutex_lock(&loopback->cable_lock);
free_cable(substream);
mutex_unlock(&loopback->cable_lock);
return 0;
return err;
}
static const struct snd_pcm_ops loopback_pcm_ops = {
@ -1086,13 +1166,8 @@ static void print_dpcm_info(struct snd_info_buffer *buffer,
snd_iprintf(buffer, " bytes_per_sec:\t%u\n", dpcm->pcm_bps);
snd_iprintf(buffer, " sample_align:\t%u\n", dpcm->pcm_salign);
snd_iprintf(buffer, " rate_shift:\t\t%u\n", dpcm->pcm_rate_shift);
snd_iprintf(buffer, " update_pending:\t%u\n",
dpcm->period_update_pending);
snd_iprintf(buffer, " irq_pos:\t\t%u\n", dpcm->irq_pos);
snd_iprintf(buffer, " period_frac:\t%u\n", dpcm->period_size_frac);
snd_iprintf(buffer, " last_jiffies:\t%lu (%lu)\n",
dpcm->last_jiffies, jiffies);
snd_iprintf(buffer, " timer_expires:\t%lu\n", dpcm->timer.expires);
if (dpcm->cable->ops->dpcm_info)
dpcm->cable->ops->dpcm_info(dpcm, buffer);
}
static void print_substream_info(struct snd_info_buffer *buffer,