[PATCH v3] ASoC: qcom: Add four speaker support on MI2S secondary

[Srinivasa Rao Mandadapu <srivasam@codeaurora.org>]

Add four speaker support on MI2S secondary block
by using I2S SD1 line on gpio52 pin, and add channel map
control support in the lpass-cpu audio driver.

Signed-off-by: Srinivasa Rao Mandadapu <srivasam@codeaurora.org>
---
 sound/soc/qcom/lpass-cpu.c    | 40 ++++++++++++++++++++++++++++++++++-
 sound/soc/qcom/lpass-sc7180.c |  1 +
 sound/soc/qcom/lpass.h        |  8 ++++++-
 3 files changed, 47 insertions(+), 2 deletions(-)

diff --git a/sound/soc/qcom/lpass-cpu.c b/sound/soc/qcom/lpass-cpu.c
index c62d2612e8f5..d03cc359983a 100644
--- a/sound/soc/qcom/lpass-cpu.c
+++ b/sound/soc/qcom/lpass-cpu.c
@@ -324,10 +324,43 @@ const struct snd_soc_dai_ops asoc_qcom_lpass_cpu_dai_ops = {
 };
 EXPORT_SYMBOL_GPL(asoc_qcom_lpass_cpu_dai_ops);
 
+int lpass_cpu_pcm_new(struct snd_soc_pcm_runtime *rtd,
+				struct snd_soc_dai *dai)
+{
+	int ret;
+	struct snd_soc_dai_driver *drv = dai->driver;
+	struct lpass_data *drvdata = snd_soc_dai_get_drvdata(dai);
+
+	ret =  snd_pcm_add_chmap_ctls(rtd->pcm, SNDRV_PCM_STREAM_PLAYBACK,
+			snd_pcm_alt_chmaps, drv->playback.channels_max, 0,
+			&drvdata->chmap_info);
+	if (ret < 0)
+		return ret;
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(lpass_cpu_pcm_new);
+
 int asoc_qcom_lpass_cpu_dai_probe(struct snd_soc_dai *dai)
 {
 	struct lpass_data *drvdata = snd_soc_dai_get_drvdata(dai);
-	int ret;
+	struct snd_soc_dai_driver *drv = dai->driver;
+	int ret, i;
+
+	drvdata->rx_chmap.channels = drv->playback.channels_max;
+	drvdata->tx_chmap.channels = drv->playback.channels_max;
+
+	if (drv->playback.channels_max == 2)
+		drvdata->chmap_idx = 1;
+	else if (drv->playback.channels_max == 4)
+		drvdata->chmap_idx = 2;
+
+	for (i = 0; i < drv->playback.channels_max; i++) {
+		drvdata->tx_chmap.map[i] =
+				snd_pcm_alt_chmaps[drvdata->chmap_idx].map[i];
+		drvdata->rx_chmap.map[i] =
+				snd_pcm_alt_chmaps[drvdata->chmap_idx].map[i];
+	}
 
 	/* ensure audio hardware is disabled */
 	ret = regmap_write(drvdata->lpaif_map,
@@ -856,6 +889,11 @@ int asoc_qcom_lpass_cpu_platform_probe(struct platform_device *pdev)
 				PTR_ERR(drvdata->mi2s_bit_clk[dai_id]));
 			return PTR_ERR(drvdata->mi2s_bit_clk[dai_id]);
 		}
+		if (drvdata->mi2s_playback_sd_mode[dai_id] ==
+			LPAIF_I2SCTL_MODE_QUAD01) {
+			variant->dai_driver[dai_id].playback.channels_min = 4;
+			variant->dai_driver[dai_id].playback.channels_max = 4;
+		}
 	}
 
 	/* Allocation for i2sctl regmap fields */
diff --git a/sound/soc/qcom/lpass-sc7180.c b/sound/soc/qcom/lpass-sc7180.c
index 8c168d3c589e..77a556b27cf0 100644
--- a/sound/soc/qcom/lpass-sc7180.c
+++ b/sound/soc/qcom/lpass-sc7180.c
@@ -58,6 +58,7 @@ static struct snd_soc_dai_driver sc7180_lpass_cpu_dai_driver[] = {
 		},
 		.probe	= &asoc_qcom_lpass_cpu_dai_probe,
 		.ops    = &asoc_qcom_lpass_cpu_dai_ops,
+		.pcm_new = lpass_cpu_pcm_new,
 	}, {
 		.id = LPASS_DP_RX,
 		.name = "Hdmi",
diff --git a/sound/soc/qcom/lpass.h b/sound/soc/qcom/lpass.h
index 83b2e08ade06..db239ea52946 100644
--- a/sound/soc/qcom/lpass.h
+++ b/sound/soc/qcom/lpass.h
@@ -110,6 +110,11 @@ struct lpass_data {
 	struct lpass_hdmitx_dmactl *hdmi_tx_dmactl[LPASS_MAX_HDMI_DMA_CHANNELS];
 	struct lpass_dp_metadata_ctl *meta_ctl;
 	struct lpass_sstream_ctl *sstream_ctl;
+	/* Channel map information */
+	struct snd_pcm_chmap *chmap_info;
+	struct snd_pcm_chmap_elem rx_chmap;
+	struct snd_pcm_chmap_elem tx_chmap;
+	int chmap_idx;
 };
 
 /* Vairant data per each SOC */
@@ -259,5 +264,6 @@ void asoc_qcom_lpass_cpu_platform_shutdown(struct platform_device *pdev);
 int asoc_qcom_lpass_cpu_platform_probe(struct platform_device *pdev);
 int asoc_qcom_lpass_cpu_dai_probe(struct snd_soc_dai *dai);
 extern const struct snd_soc_dai_ops asoc_qcom_lpass_cpu_dai_ops;
-
+int lpass_cpu_pcm_new(struct snd_soc_pcm_runtime *rtd,
+				struct snd_soc_dai *dai);
 #endif /* __LPASS_H__ */
-- 
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