1 files changed, 123 insertions, 16 deletions

diff --git a/sound/drivers/aloop.c b/sound/drivers/aloop.c
index 838ad86311b8..12b44b0b6777 100644
--- a/sound/drivers/aloop.c
+++ b/sound/drivers/aloop.c
@@ -39,6 +39,7 @@
 #include <sound/core.h>
 #include <sound/control.h>
 #include <sound/pcm.h>
+#include <sound/info.h>
 #include <sound/initval.h>
 
 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
@@ -76,6 +77,7 @@ struct loopback_cable {
         /* flags */
         unsigned int valid;
         unsigned int running;
+        unsigned int pause;
 };
 
 struct loopback_setup {
@@ -184,6 +186,7 @@ static void loopback_timer_start(struct loopback_pcm *dpcm)
 static inline void loopback_timer_stop(struct loopback_pcm *dpcm)
 {
         del_timer(&dpcm->timer);
+        dpcm->timer.expires = 0;
 }
 
 #define CABLE_VALID_PLAYBACK    (1 << SNDRV_PCM_STREAM_PLAYBACK)
@@ -252,7 +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:
@@ -261,17 +264,36 @@ static int loopback_trigger(struct snd_pcm_substream *substream, int cmd)
                         return err;
                 dpcm->last_jiffies = jiffies;
                 dpcm->pcm_rate_shift = 0;
+                spin_lock(&cable->lock);        
+                cable->running |= stream;
+                cable->pause &= ~stream;
+                spin_unlock(&cable->lock);
                 loopback_timer_start(dpcm);
-                cable->running |= (1 << substream->stream);
                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
                         loopback_active_notify(dpcm);
                 break;
         case SNDRV_PCM_TRIGGER_STOP:
-                cable->running &= ~(1 << substream->stream);
+                spin_lock(&cable->lock);        
+                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;
         }
@@ -452,28 +474,30 @@ static void loopback_bytepos_update(struct loopback_pcm *dpcm,
         }
 }
 
-static void loopback_pos_update(struct loopback_cable *cable)
+static unsigned int loopback_pos_update(struct loopback_cable *cable)
 {
         struct loopback_pcm *dpcm_play =
                         cable->streams[SNDRV_PCM_STREAM_PLAYBACK];
         struct loopback_pcm *dpcm_capt =
                         cable->streams[SNDRV_PCM_STREAM_CAPTURE];
         unsigned long delta_play = 0, delta_capt = 0;
+        unsigned int running;
 
         spin_lock(&cable->lock);        
-        if (cable->running & (1 << SNDRV_PCM_STREAM_PLAYBACK)) {
+        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;
         }
 
-        if (cable->running & (1 << SNDRV_PCM_STREAM_CAPTURE)) {
+        if (running & (1 << SNDRV_PCM_STREAM_CAPTURE)) {
                 delta_capt = jiffies - dpcm_capt->last_jiffies;
                 dpcm_capt->last_jiffies += delta_capt;
         }
 
         if (delta_play == 0 && delta_capt == 0) {
                 spin_unlock(&cable->lock);
-                return;
+                return running;
         }
                 
         if (delta_play > delta_capt) {
@@ -488,27 +512,27 @@ static void loopback_pos_update(struct loopback_cable *cable)
 
         if (delta_play == 0 && delta_capt == 0) {
                 spin_unlock(&cable->lock);
-                return;
+                return running;
         }
         /* 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);
+        return running;
 }
 
 static void loopback_timer_function(unsigned long data)
 {
         struct loopback_pcm *dpcm = (struct loopback_pcm *)data;
-        int stream;
+        unsigned int running;
 
-        loopback_pos_update(dpcm->cable);
-        stream = dpcm->substream->stream;
-        if (dpcm->cable->running & (1 << stream))
+        running = loopback_pos_update(dpcm->cable);
+        if (running & (1 << dpcm->substream->stream)) {
                 loopback_timer_start(dpcm);
-        if (dpcm->period_update_pending) {
-                dpcm->period_update_pending = 0;
-                if (dpcm->cable->running & (1 << stream))
+                if (dpcm->period_update_pending) {
+                        dpcm->period_update_pending = 0;
                         snd_pcm_period_elapsed(dpcm->substream);
+                }
         }
 }
 
@@ -524,7 +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),
@@ -1011,6 +1035,87 @@ static int __devinit loopback_mixer_new(struct loopback *loopback, int notify)
         return 0;
 }
 
+#ifdef CONFIG_PROC_FS
+
+static void print_dpcm_info(struct snd_info_buffer *buffer,
+                            struct loopback_pcm *dpcm,
+                            const char *id)
+{
+        snd_iprintf(buffer, "  %s\n", id);
+        if (dpcm == NULL) {
+                snd_iprintf(buffer, "    inactive\n");
+                return;
+        }
+        snd_iprintf(buffer, "    buffer_size:\t%u\n", dpcm->pcm_buffer_size);
+        snd_iprintf(buffer, "    buffer_pos:\t\t%u\n", dpcm->buf_pos);
+        snd_iprintf(buffer, "    silent_size:\t%u\n", dpcm->silent_size);
+        snd_iprintf(buffer, "    period_size:\t%u\n", dpcm->pcm_period_size);
+        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);
+}
+
+static void print_substream_info(struct snd_info_buffer *buffer,
+                                 struct loopback *loopback,
+                                 int sub,
+                                 int num)
+{
+        struct loopback_cable *cable = loopback->cables[sub][num];
+
+        snd_iprintf(buffer, "Cable %i substream %i:\n", num, sub);
+        if (cable == NULL) {
+                snd_iprintf(buffer, "  inactive\n");
+                return;
+        }
+        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");
+}
+
+static void print_cable_info(struct snd_info_entry *entry,
+                             struct snd_info_buffer *buffer)
+{
+        struct loopback *loopback = entry->private_data;
+        int sub, num;
+
+        mutex_lock(&loopback->cable_lock);
+        num = entry->name[strlen(entry->name)-1];
+        num = num == '0' ? 0 : 1;
+        for (sub = 0; sub < MAX_PCM_SUBSTREAMS; sub++)
+                print_substream_info(buffer, loopback, sub, num);
+        mutex_unlock(&loopback->cable_lock);
+}
+
+static int __devinit loopback_proc_new(struct loopback *loopback, int cidx)
+{
+        char name[32];
+        struct snd_info_entry *entry;
+        int err;
+
+        snprintf(name, sizeof(name), "cable#%d", cidx);
+        err = snd_card_proc_new(loopback->card, name, &entry);
+        if (err < 0)
+                return err;
+
+        snd_info_set_text_ops(entry, loopback, print_cable_info);
+        return 0;
+}
+
+#else /* !CONFIG_PROC_FS */
+
+#define loopback_proc_new(loopback, cidx) do { } while (0)
+
+#endif
+
 static int __devinit loopback_probe(struct platform_device *devptr)
 {
         struct snd_card *card;
@@ -1041,6 +1146,8 @@ static int __devinit loopback_probe(struct platform_device *devptr)
         err = loopback_mixer_new(loopback, pcm_notify[dev] ? 1 : 0);
         if (err < 0)
                 goto __nodev;
+        loopback_proc_new(loopback, 0);
+        loopback_proc_new(loopback, 1);
         strcpy(card->driver, "Loopback");
         strcpy(card->shortname, "Loopback");
         sprintf(card->longname, "Loopback %i", dev + 1);