ALSA: snd-aloop - add pause support

Signed-off-by: Jaroslav Kysela <perex@perex.cz>

1 files changed, 22 insertions, 5 deletions

diff --git a/sound/drivers/aloop.c b/sound/drivers/aloop.c
index 38e8351e935d..12b44b0b6777 100644
--- a/sound/drivers/aloop.c
+++ b/sound/drivers/aloop.c
@@ -77,6 +77,7 @@ struct loopback_cable {
         /* flags */
         unsigned int valid;
         unsigned int running;
+        unsigned int pause;
 };
 
 struct loopback_setup {
@@ -254,7 +255,7 @@ static int loopback_trigger(struct snd_pcm_substream *substream, int cmd)
         struct snd_pcm_runtime *runtime = substream->runtime;
         struct loopback_pcm *dpcm = runtime->private_data;
         struct loopback_cable *cable = dpcm->cable;
-        int err;
+        int err, stream = 1 << substream->stream;
 
         switch (cmd) {
         case SNDRV_PCM_TRIGGER_START:
@@ -264,7 +265,8 @@ static int loopback_trigger(struct snd_pcm_substream *substream, int cmd)
                 dpcm->last_jiffies = jiffies;
                 dpcm->pcm_rate_shift = 0;
                 spin_lock(&cable->lock);        
-                cable->running |= (1 << substream->stream);
+                cable->running |= stream;
+                cable->pause &= ~stream;
                 spin_unlock(&cable->lock);
                 loopback_timer_start(dpcm);
                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
@@ -272,12 +274,26 @@ static int loopback_trigger(struct snd_pcm_substream *substream, int cmd)
                 break;
         case SNDRV_PCM_TRIGGER_STOP:
                 spin_lock(&cable->lock);        
-                cable->running &= ~(1 << substream->stream);
+                cable->running &= ~stream;
+                cable->pause &= ~stream;
                 spin_unlock(&cable->lock);
                 loopback_timer_stop(dpcm);
                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
                         loopback_active_notify(dpcm);
                 break;
+        case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+                spin_lock(&cable->lock);        
+                cable->pause |= stream;
+                spin_unlock(&cable->lock);
+                loopback_timer_stop(dpcm);
+                break;
+        case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+                spin_lock(&cable->lock);
+                dpcm->last_jiffies = jiffies;
+                cable->pause &= ~stream;
+                spin_unlock(&cable->lock);
+                loopback_timer_start(dpcm);
+                break;
         default:
                 return -EINVAL;
         }
@@ -468,7 +484,7 @@ static unsigned int loopback_pos_update(struct loopback_cable *cable)
         unsigned int running;
 
         spin_lock(&cable->lock);        
-        running = cable->running;
+        running = cable->running ^ cable->pause;
         if (running & (1 << SNDRV_PCM_STREAM_PLAYBACK)) {
                 delta_play = jiffies - dpcm_play->last_jiffies;
                 dpcm_play->last_jiffies += delta_play;
@@ -532,7 +548,7 @@ static snd_pcm_uframes_t loopback_pointer(struct snd_pcm_substream *substream)
 static struct snd_pcm_hardware loopback_pcm_hardware =
 {
         .info =         (SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_MMAP |
-                         SNDRV_PCM_INFO_MMAP_VALID),
+                         SNDRV_PCM_INFO_MMAP_VALID | SNDRV_PCM_INFO_PAUSE),
         .formats =      (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S16_BE |
                          SNDRV_PCM_FMTBIT_S32_LE | SNDRV_PCM_FMTBIT_S32_BE |
                          SNDRV_PCM_FMTBIT_FLOAT_LE | SNDRV_PCM_FMTBIT_FLOAT_BE),
@@ -1060,6 +1076,7 @@ static void print_substream_info(struct snd_info_buffer *buffer,
         }
         snd_iprintf(buffer, "  valid: %u\n", cable->valid);
         snd_iprintf(buffer, "  running: %u\n", cable->running);
+        snd_iprintf(buffer, "  pause: %u\n", cable->pause);
         print_dpcm_info(buffer, cable->streams[0], "Playback");
         print_dpcm_info(buffer, cable->streams[1], "Capture");
 }