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Subject[PATCH 1/3] ASoC: bdw-rt5677: channel constraint support
Date
BDW boards using this machine driver supports only stereo capture and
playback. Implement a constraint to enforce it.

Signed-off-by: Brent Lu <brent.lu@intel.com>
---
sound/soc/intel/boards/bdw-rt5677.c | 33 +++++++++++++++++++++++++++++++++
1 file changed, 33 insertions(+)

diff --git a/sound/soc/intel/boards/bdw-rt5677.c b/sound/soc/intel/boards/bdw-rt5677.c
index cc41a34..7963cae 100644
--- a/sound/soc/intel/boards/bdw-rt5677.c
+++ b/sound/soc/intel/boards/bdw-rt5677.c
@@ -22,6 +22,8 @@

#include "../../codecs/rt5677.h"

+#define DUAL_CHANNEL 2
+
struct bdw_rt5677_priv {
struct gpio_desc *gpio_hp_en;
struct snd_soc_component *component;
@@ -222,6 +224,36 @@ static int bdw_rt5677_rtd_init(struct snd_soc_pcm_runtime *rtd)
}
#endif

+static const unsigned int channels[] = {
+ DUAL_CHANNEL,
+};
+
+static const struct snd_pcm_hw_constraint_list constraints_channels = {
+ .count = ARRAY_SIZE(channels),
+ .list = channels,
+ .mask = 0,
+};
+
+static int bdw_fe_startup(struct snd_pcm_substream *substream)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+
+ /*
+ * On this platform for PCM device we support,
+ * stereo audio
+ */
+
+ runtime->hw.channels_max = DUAL_CHANNEL;
+ snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
+ &constraints_channels);
+
+ return 0;
+}
+
+static const struct snd_soc_ops bdw_rt5677_fe_ops = {
+ .startup = bdw_fe_startup,
+};
+
static int bdw_rt5677_init(struct snd_soc_pcm_runtime *rtd)
{
struct bdw_rt5677_priv *bdw_rt5677 =
@@ -321,6 +353,7 @@ static struct snd_soc_dai_link bdw_rt5677_dais[] = {
},
.dpcm_capture = 1,
.dpcm_playback = 1,
+ .ops = &bdw_rt5677_fe_ops,
SND_SOC_DAILINK_REG(fe, dummy, platform),
},

--
2.7.4
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