[alsa-devel] [PATCH 1/4] ASoC: mediatek: mt8183-da7219: change supported formats of DL2 and UL1

[Tzung-Bi Shih]

DL2 and UL1 are for BTSCO.  Provides only 16-bit, mono, 8kHz and
16kHz to userspace.

Signed-off-by: Tzung-Bi Shih <tzungbi at google.com>
---
 .../mediatek/mt8183/mt8183-da7219-max98357.c  | 42 +++++++++++++++++++
 1 file changed, 42 insertions(+)

diff --git a/sound/soc/mediatek/mt8183/mt8183-da7219-max98357.c b/sound/soc/mediatek/mt8183/mt8183-da7219-max98357.c
index c65493721e90..b7d4bfd04b37 100644
--- a/sound/soc/mediatek/mt8183/mt8183-da7219-max98357.c
+++ b/sound/soc/mediatek/mt8183/mt8183-da7219-max98357.c
@@ -116,6 +116,46 @@ static int mt8183_i2s_hw_params_fixup(struct snd_soc_pcm_runtime *rtd,
 	return 0;
 }
 
+static int
+mt8183_da7219_max98357_bt_sco_startup(
+	struct snd_pcm_substream *substream)
+{
+	static const unsigned int rates[] = {
+		8000, 16000
+	};
+	static const struct snd_pcm_hw_constraint_list constraints_rates = {
+		.count = ARRAY_SIZE(rates),
+		.list  = rates,
+		.mask = 0,
+	};
+	static const unsigned int channels[] = {
+		1,
+	};
+	static const struct snd_pcm_hw_constraint_list constraints_channels = {
+		.count = ARRAY_SIZE(channels),
+		.list = channels,
+		.mask = 0,
+	};
+
+	struct snd_pcm_runtime *runtime = substream->runtime;
+
+	snd_pcm_hw_constraint_list(runtime, 0,
+			SNDRV_PCM_HW_PARAM_RATE, &constraints_rates);
+	runtime->hw.channels_max = 1;
+	snd_pcm_hw_constraint_list(runtime, 0,
+			SNDRV_PCM_HW_PARAM_CHANNELS,
+			&constraints_channels);
+
+	runtime->hw.formats = SNDRV_PCM_FMTBIT_S16_LE;
+	snd_pcm_hw_constraint_msbits(runtime, 0, 16, 16);
+
+	return 0;
+}
+
+static const struct snd_soc_ops mt8183_da7219_max98357_bt_sco_ops = {
+	.startup = mt8183_da7219_max98357_bt_sco_startup,
+};
+
 /* FE */
 SND_SOC_DAILINK_DEFS(playback1,
 	DAILINK_COMP_ARRAY(COMP_CPU("DL1")),
@@ -222,6 +262,7 @@ static struct snd_soc_dai_link mt8183_da7219_max98357_dai_links[] = {
 			    SND_SOC_DPCM_TRIGGER_PRE},
 		.dynamic = 1,
 		.dpcm_playback = 1,
+		.ops = &mt8183_da7219_max98357_bt_sco_ops,
 		SND_SOC_DAILINK_REG(playback2),
 	},
 	{
@@ -240,6 +281,7 @@ static struct snd_soc_dai_link mt8183_da7219_max98357_dai_links[] = {
 			    SND_SOC_DPCM_TRIGGER_PRE},
 		.dynamic = 1,
 		.dpcm_capture = 1,
+		.ops = &mt8183_da7219_max98357_bt_sco_ops,
 		SND_SOC_DAILINK_REG(capture1),
 	},
 	{
-- 
2.25.0.341.g760bfbb309-goog