ALSA: aloop - Use vmalloc buffer
[linux-3.10.git] / sound / drivers / aloop.c
index 38e8351..4067f15 100644 (file)
@@ -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;
        }
@@ -466,9 +482,10 @@ static unsigned int loopback_pos_update(struct loopback_cable *cable)
                        cable->streams[SNDRV_PCM_STREAM_CAPTURE];
        unsigned long delta_play = 0, delta_capt = 0;
        unsigned int running;
+       unsigned long flags;
 
-       spin_lock(&cable->lock);        
-       running = cable->running;
+       spin_lock_irqsave(&cable->lock, flags);
+       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;
@@ -479,10 +496,8 @@ static unsigned int loopback_pos_update(struct loopback_cable *cable)
                dpcm_capt->last_jiffies += delta_capt;
        }
 
-       if (delta_play == 0 && delta_capt == 0) {
-               spin_unlock(&cable->lock);
-               return running;
-       }
+       if (delta_play == 0 && delta_capt == 0)
+               goto unlock;
                
        if (delta_play > delta_capt) {
                loopback_bytepos_update(dpcm_play, delta_play - delta_capt,
@@ -494,14 +509,14 @@ static unsigned int loopback_pos_update(struct loopback_cable *cable)
                delta_capt = delta_play;
        }
 
-       if (delta_play == 0 && delta_capt == 0) {
-               spin_unlock(&cable->lock);
-               return running;
-       }
+       if (delta_play == 0 && delta_capt == 0)
+               goto unlock;
+
        /* note delta_capt == delta_play at this moment */
        loopback_bytepos_update(dpcm_capt, delta_capt, BYTEPOS_UPDATE_COPY);
        loopback_bytepos_update(dpcm_play, delta_play, BYTEPOS_UPDATE_POSONLY);
-       spin_unlock(&cable->lock);
+ unlock:
+       spin_unlock_irqrestore(&cable->lock, flags);
        return running;
 }
 
@@ -532,7 +547,7 @@ 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),
@@ -560,7 +575,8 @@ static void loopback_runtime_free(struct snd_pcm_runtime *runtime)
 static int loopback_hw_params(struct snd_pcm_substream *substream,
                              struct snd_pcm_hw_params *params)
 {
-       return snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(params));
+       return snd_pcm_lib_alloc_vmalloc_buffer(substream,
+                                               params_buffer_bytes(params));
 }
 
 static int loopback_hw_free(struct snd_pcm_substream *substream)
@@ -572,7 +588,7 @@ static int loopback_hw_free(struct snd_pcm_substream *substream)
        mutex_lock(&dpcm->loopback->cable_lock);
        cable->valid &= ~(1 << substream->stream);
        mutex_unlock(&dpcm->loopback->cable_lock);
-       return snd_pcm_lib_free_pages(substream);
+       return snd_pcm_lib_free_vmalloc_buffer(substream);
 }
 
 static unsigned int get_cable_index(struct snd_pcm_substream *substream)
@@ -725,6 +741,8 @@ static struct snd_pcm_ops loopback_playback_ops = {
        .prepare =      loopback_prepare,
        .trigger =      loopback_trigger,
        .pointer =      loopback_pointer,
+       .page =         snd_pcm_lib_get_vmalloc_page,
+       .mmap =         snd_pcm_lib_mmap_vmalloc,
 };
 
 static struct snd_pcm_ops loopback_capture_ops = {
@@ -736,6 +754,8 @@ static struct snd_pcm_ops loopback_capture_ops = {
        .prepare =      loopback_prepare,
        .trigger =      loopback_trigger,
        .pointer =      loopback_pointer,
+       .page =         snd_pcm_lib_get_vmalloc_page,
+       .mmap =         snd_pcm_lib_mmap_vmalloc,
 };
 
 static int __devinit loopback_pcm_new(struct loopback *loopback,
@@ -756,10 +776,6 @@ static int __devinit loopback_pcm_new(struct loopback *loopback,
        strcpy(pcm->name, "Loopback PCM");
 
        loopback->pcm[device] = pcm;
-
-       snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_CONTINUOUS,
-                       snd_dma_continuous_data(GFP_KERNEL),
-                       0, 2 * 1024 * 1024);
        return 0;
 }
 
@@ -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");
 }