[RFC, PATCH v2 1/2] ASoC: qcom: sdw: Add TDM support

[Jianhua Lu <lujianhua000@xxxxxxxxx>]

Add qcom TDM setup function to support TDM ports for qcom platform.

Signed-off-by: Jianhua Lu <lujianhua000@xxxxxxxxx>
---
Changes in v2:
  1. remove EXPORT_SYMBOL_GPL
  2. remove static modifier

 sound/soc/qcom/sdw.c | 63 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 63 insertions(+)

diff --git a/sound/soc/qcom/sdw.c b/sound/soc/qcom/sdw.c
index 77dbe0c28b29..948abbd2e0e3 100644
--- a/sound/soc/qcom/sdw.c
+++ b/sound/soc/qcom/sdw.c
@@ -4,6 +4,7 @@
 
 #include <dt-bindings/sound/qcom,q6afe.h>
 #include <linux/module.h>
+#include <sound/pcm_params.h>
 #include <sound/soc.h>
 #include "sdw.h"
 
@@ -101,6 +102,65 @@ int qcom_snd_sdw_prepare(struct snd_pcm_substream *substream,
 }
 EXPORT_SYMBOL_GPL(qcom_snd_sdw_prepare);
 
+int qcom_snd_tdm_hw_params(struct snd_pcm_substream *substream,
+			   struct snd_pcm_hw_params *params)
+{
+	struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
+	struct snd_soc_dai *cpu_dai = snd_soc_rtd_to_cpu(rtd, 0);
+	unsigned int tdm_slot_offset[8] = { 0, 4, 8, 12, 16, 20, 24, 28 };
+	int channels, slot_width;
+	int ret;
+
+	switch (params_format(params)) {
+	case SNDRV_PCM_FORMAT_S16_LE:
+		slot_width = 16;
+		break;
+	case SNDRV_PCM_FORMAT_S24_LE:
+		slot_width = 24;
+		break;
+	case SNDRV_PCM_FORMAT_S32_LE:
+		slot_width = 32;
+		break;
+	default:
+		dev_err(rtd->dev, "%s: invalid param format 0x%x\n", __func__,
+			params_format(params));
+		return -EINVAL;
+	}
+
+	channels = params_channels(params);
+	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
+		ret = snd_soc_dai_set_tdm_slot(cpu_dai, 0, 0x3, 8, slot_width);
+		if (ret < 0) {
+			dev_err(rtd->dev, "%s: failed to set tdm slot, err:%d\n",
+				__func__, ret);
+			return ret;
+		}
+
+		ret = snd_soc_dai_set_channel_map(cpu_dai, 0, NULL, channels,
+						  tdm_slot_offset);
+		if (ret < 0) {
+			dev_err(rtd->dev, "%s: failed to set channel map, err:%d\n",
+				__func__, ret);
+			return ret;
+		}
+	} else {
+		ret = snd_soc_dai_set_tdm_slot(cpu_dai, 0xf, 0, 8, slot_width);
+		if (ret < 0) {
+			dev_err(rtd->dev, "%s: failed to set tdm slot, err:%d\n",
+				__func__, ret);
+			return ret;
+		}
+
+		ret = snd_soc_dai_set_channel_map(cpu_dai, channels,
+						  tdm_slot_offset, 0, NULL);
+		if (ret < 0) {
+			dev_err(rtd->dev, "%s: failed to set channel map, err:%d\n",
+				__func__, ret);
+			return ret;
+		}
+	}
+}
+
 int qcom_snd_sdw_hw_params(struct snd_pcm_substream *substream,
 			   struct snd_pcm_hw_params *params,
 			   struct sdw_stream_runtime **psruntime)
@@ -125,6 +185,9 @@ int qcom_snd_sdw_hw_params(struct snd_pcm_substream *substream,
 				*psruntime = sruntime;
 		}
 		break;
+	case PRIMARY_TDM_RX_0...QUINARY_TDM_TX_7:
+		qcom_snd_tdm_hw_params(substream, params);
+		break;
 	}
 
 	return 0;
-- 
2.41.0