ASoC: Allow mulitple usage count of codec and cpu dai

If we are to have a snd_soc_dai i.e, cpu_dai and codec_dai, shared among two
or more dai_links we need to log the number of active users of the dai.
For that, we change semantics of the snd_soc_dai.active flag from indicator
to reference counter.

Signed-off-by: Jassi Brar <jassi.brar@samsung.com>
Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

include/sound/soc.h

@@ -375,7 +375,7 @@ struct snd_soc_pcm_stream {
 	unsigned int rate_max;		/* max rate */
 	unsigned int channels_min;	/* min channels */
 	unsigned int channels_max;	/* max channels */
-	unsigned int active:1;		/* stream is in use */
+	unsigned int active;		/* num of active users of the stream */
 };
 
 /* SoC audio ops */

sound/soc/soc-core.c

@@ -454,11 +454,15 @@ static int soc_pcm_open(struct snd_pcm_substream *substream)
 	pr_debug("asoc: min rate %d max rate %d\n", runtime->hw.rate_min,
 		 runtime->hw.rate_max);
 
-	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
-		cpu_dai->playback.active = codec_dai->playback.active = 1;
-	else
-		cpu_dai->capture.active = codec_dai->capture.active = 1;
-	cpu_dai->active = codec_dai->active = 1;
+	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
+		cpu_dai->playback.active++;
+		codec_dai->playback.active++;
+	} else {
+		cpu_dai->capture.active++;
+		codec_dai->capture.active++;
+	}
+	cpu_dai->active++;
+	codec_dai->active++;
 	card->codec->active++;
 	mutex_unlock(&pcm_mutex);
 	return 0;
@@ -530,15 +534,16 @@ static int soc_codec_close(struct snd_pcm_substream *substream)
 
 	mutex_lock(&pcm_mutex);
 
-	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
-		cpu_dai->playback.active = codec_dai->playback.active = 0;
-	else
-		cpu_dai->capture.active = codec_dai->capture.active = 0;
-
-	if (codec_dai->playback.active == 0 &&
-		codec_dai->capture.active == 0) {
-		cpu_dai->active = codec_dai->active = 0;
+	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
+		cpu_dai->playback.active--;
+		codec_dai->playback.active--;
+	} else {
+		cpu_dai->capture.active--;
+		codec_dai->capture.active--;
 	}
+
+	cpu_dai->active--;
+	codec_dai->active--;
 	codec->active--;
 
 	/* Muting the DAC suppresses artifacts caused during digital