ASoC: sst_platform: voice call support in platform driver

Voice dai insided the platfor driver is a dummy dai.  It doesn't have
any standard alsa dma capabilities.  Voice dai only supports open, close and
set_params alsa apis.

Change-Id: I508d9ebca777ef3e23659e11b881fa4b52d5de41
Signed-off-by: Ramesh Babu K V <ramesh.babu@intel.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>

diff --git a/sound/soc/mid-x86/sst_platform.c b/sound/soc/mid-x86/sst_platform.c
index 54e2ec5..b3b06e6 100644 (file)
--- a/sound/soc/mid-x86/sst_platform.c
+++ b/sound/soc/mid-x86/sst_platform.c
@@ -35,6 +35,8 @@
 #include "../../../drivers/staging/intel_sst/intel_sst.h"
 #include "sst_platform.h"
 
+#define VOICE_DAI 4
+
 static struct snd_pcm_hardware sst_platform_pcm_hw = {
        .info = (SNDRV_PCM_INFO_INTERLEAVED |
                        SNDRV_PCM_INFO_DOUBLE |
@@ -110,6 +112,22 @@ struct snd_soc_dai_driver sst_platform_dai[] = {
                .formats = SNDRV_PCM_FMTBIT_S16_LE,
        },
 },
+{
+       .name = "Voice-cpu-dai",
+       .id = 4,
+       .playback = {
+               .channels_min = SST_MONO,
+               .channels_max = SST_STEREO,
+               .rates = SNDRV_PCM_RATE_48000,
+               .formats = SNDRV_PCM_FMTBIT_S16_LE,
+       },
+       .capture = {
+               .channels_min = SST_MONO,
+               .channels_max = SST_STEREO,
+               .rates = SNDRV_PCM_RATE_48000,
+               .formats = SNDRV_PCM_FMTBIT_S16_LE,
+       },
+},
 };
 
 /* helper functions */
@@ -233,6 +251,11 @@ static int sst_platform_open(struct snd_pcm_substream *substream)
        pr_debug("sst_platform_open called\n");
        runtime = substream->runtime;
        runtime->hw = sst_platform_pcm_hw;
+       if (substream->pcm->device == VOICE_DAI) {
+               pr_debug("pcm_open for Voice, returning.\n");
+               return snd_pcm_hw_constraint_integer(runtime,
+                        SNDRV_PCM_HW_PARAM_PERIODS);
+       }
        stream = kzalloc(sizeof(*stream), GFP_KERNEL);
        if (!stream)
                return -ENOMEM;
@@ -268,6 +291,10 @@ static int sst_platform_close(struct snd_pcm_substream *substream)
        int ret_val = 0, str_id;
 
        pr_debug("sst_platform_close called\n");
+       if (substream->pcm->device == VOICE_DAI) {
+               pr_debug("pcm_close for Voice, returning.\n");
+               return ret_val;
+       }
        stream = substream->runtime->private_data;
        str_id = stream->stream_info.str_id;
        if (str_id)
@@ -284,6 +311,10 @@ static int sst_platform_pcm_prepare(struct snd_pcm_substream *substream)
        int ret_val = 0, str_id;
 
        pr_debug("sst_platform_pcm_prepare called\n");
+       if (substream->pcm->device == VOICE_DAI) {
+               pr_debug("pcm_preare for Voice, returning.\n");
+               return ret_val;
+       }
        stream = substream->runtime->private_data;
        str_id = stream->stream_info.str_id;
        if (stream->stream_info.str_id) {