ASoC: tlv320dac33: Manage a pointer for snd_pcm_substream in private structure

As a preparation for supporting codec to be turned off,
when we are in BIAS_STANDBY.

The substream must be easily available in other places than
pcm_* callbacks.

Manage a pointer in _startup, and _shutdown for this.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@nokia.com>
Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Liam Girdwood <lrg@slimlogic.co.uk>

1 files changed, 28 insertions, 0 deletions

diff --git a/sound/soc/codecs/tlv320dac33.c b/sound/soc/codecs/tlv320dac33.c
index 9944721a055c..50d152215abd 100644
--- a/sound/soc/codecs/tlv320dac33.c
+++ b/sound/soc/codecs/tlv320dac33.c
@@ -91,6 +91,7 @@ struct tlv320dac33_priv {
         struct work_struct work;
         struct snd_soc_codec codec;
         struct regulator_bulk_data supplies[DAC33_NUM_SUPPLIES];
+        struct snd_pcm_substream *substream;
         int power_gpio;
         int chip_power;
         int irq;
@@ -720,6 +721,31 @@ static void dac33_oscwait(struct snd_soc_codec *codec)
                         "internal oscillator calibration failed\n");
 }
 
+static int dac33_startup(struct snd_pcm_substream *substream,
+                           struct snd_soc_dai *dai)
+{
+        struct snd_soc_pcm_runtime *rtd = substream->private_data;
+        struct snd_soc_device *socdev = rtd->socdev;
+        struct snd_soc_codec *codec = socdev->card->codec;
+        struct tlv320dac33_priv *dac33 = snd_soc_codec_get_drvdata(codec);
+
+        /* Stream started, save the substream pointer */
+        dac33->substream = substream;
+
+        return 0;
+}
+
+static void dac33_shutdown(struct snd_pcm_substream *substream,
+                             struct snd_soc_dai *dai)
+{
+        struct snd_soc_pcm_runtime *rtd = substream->private_data;
+        struct snd_soc_device *socdev = rtd->socdev;
+        struct snd_soc_codec *codec = socdev->card->codec;
+        struct tlv320dac33_priv *dac33 = snd_soc_codec_get_drvdata(codec);
+
+        dac33->substream = NULL;
+}
+
 static int dac33_hw_params(struct snd_pcm_substream *substream,
                            struct snd_pcm_hw_params *params,
                            struct snd_soc_dai *dai)
@@ -1367,6 +1393,8 @@ EXPORT_SYMBOL_GPL(soc_codec_dev_tlv320dac33);
 #define DAC33_FORMATS   SNDRV_PCM_FMTBIT_S16_LE
 
 static struct snd_soc_dai_ops dac33_dai_ops = {
+        .startup        = dac33_startup,
+        .shutdown       = dac33_shutdown,
         .hw_params      = dac33_hw_params,
         .prepare        = dac33_pcm_prepare,
         .trigger        = dac33_pcm_trigger,