ASoC: cs42l42: Add Capture Support

Add support for capture path on headseat pins

Signed-off-by: Lucas Tanure <tanureal@opensource.cirrus.com>
Link: https://lore.kernel.org/r/20210306185553.62053-11-tanureal@opensource.cirrus.com
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/codecs/cs42l42.c

@@ -472,6 +472,18 @@ static const struct snd_soc_dapm_widget cs42l42_dapm_widgets[] = {
 
 	/* Playback Requirements */
 	SND_SOC_DAPM_SUPPLY("ASP DAI0", CS42L42_PWR_CTL1, CS42L42_ASP_DAI_PDN_SHIFT, 1, NULL, 0),
+
+	/* Capture Path */
+	SND_SOC_DAPM_INPUT("HS"),
+	SND_SOC_DAPM_ADC("ADC", NULL, CS42L42_PWR_CTL1, CS42L42_ADC_PDN_SHIFT, 1),
+	SND_SOC_DAPM_AIF_OUT("SDOUT1", NULL, 0, CS42L42_ASP_TX_CH_EN, CS42L42_ASP_TX0_CH1_SHIFT, 0),
+	SND_SOC_DAPM_AIF_OUT("SDOUT2", NULL, 1, CS42L42_ASP_TX_CH_EN, CS42L42_ASP_TX0_CH2_SHIFT, 0),
+
+	/* Capture Requirements */
+	SND_SOC_DAPM_SUPPLY("ASP DAO0", CS42L42_PWR_CTL1, CS42L42_ASP_DAO_PDN_SHIFT, 1, NULL, 0),
+	SND_SOC_DAPM_SUPPLY("ASP TX EN", CS42L42_ASP_TX_SZ_EN, CS42L42_ASP_TX_EN_SHIFT, 0, NULL, 0),
+
+	/* Playback/Capture Requirements */
 	SND_SOC_DAPM_SUPPLY("SCLK", CS42L42_ASP_CLK_CFG, CS42L42_ASP_SCLK_EN_SHIFT, 0, NULL, 0),
 };
 
@@ -489,6 +501,21 @@ static const struct snd_soc_dapm_route cs42l42_audio_map[] = {
 	{"SDIN2", NULL, "ASP DAI0"},
 	{"SDIN1", NULL, "SCLK"},
 	{"SDIN2", NULL, "SCLK"},
+
+	/* Capture Path */
+	{"ADC", NULL, "HS"},
+	{ "SDOUT1", NULL, "ADC" },
+	{ "SDOUT2", NULL, "ADC" },
+	{ "Capture", NULL, "SDOUT1" },
+	{ "Capture", NULL, "SDOUT2" },
+
+	/* Capture Requirements */
+	{ "SDOUT1", NULL, "ASP DAO0" },
+	{ "SDOUT2", NULL, "ASP DAO0" },
+	{ "SDOUT1", NULL, "SCLK" },
+	{ "SDOUT2", NULL, "SCLK" },
+	{ "SDOUT1", NULL, "ASP TX EN" },
+	{ "SDOUT2", NULL, "ASP TX EN" },
 };
 
 static int cs42l42_component_probe(struct snd_soc_component *component)
@@ -748,12 +775,24 @@ static int cs42l42_pcm_hw_params(struct snd_pcm_substream *substream,
 {
 	struct snd_soc_component *component = dai->component;
 	struct cs42l42_private *cs42l42 = snd_soc_component_get_drvdata(component);
+	unsigned int channels = params_channels(params);
 	unsigned int width = (params_width(params) / 8) - 1;
 	unsigned int val = 0;
 
 	cs42l42->srate = params_rate(params);
 
 	switch(substream->stream) {
+	case SNDRV_PCM_STREAM_CAPTURE:
+		if (channels == 2) {
+			val |= CS42L42_ASP_TX_CH2_AP_MASK;
+			val |= width << CS42L42_ASP_TX_CH2_RES_SHIFT;
+		}
+		val |= width << CS42L42_ASP_TX_CH1_RES_SHIFT;
+
+		snd_soc_component_update_bits(component, CS42L42_ASP_TX_CH_AP_RES,
+				CS42L42_ASP_TX_CH1_AP_MASK | CS42L42_ASP_TX_CH2_AP_MASK |
+				CS42L42_ASP_TX_CH2_RES_MASK | CS42L42_ASP_TX_CH1_RES_MASK, val);
+		break;
 	case SNDRV_PCM_STREAM_PLAYBACK:
 		val |= width << CS42L42_ASP_RX_CH_RES_SHIFT;
 		/* channel 1 on low LRCLK */

sound/soc/codecs/cs42l42.h

@@ -683,8 +683,20 @@
 
 /* Page 0x29 Serial Port TX Registers */
 #define CS42L42_ASP_TX_SZ_EN		(CS42L42_PAGE_29 + 0x01)
+#define CS42L42_ASP_TX_EN_SHIFT		0
 #define CS42L42_ASP_TX_CH_EN		(CS42L42_PAGE_29 + 0x02)
+#define CS42L42_ASP_TX0_CH2_SHIFT	1
+#define CS42L42_ASP_TX0_CH1_SHIFT	0
+
 #define CS42L42_ASP_TX_CH_AP_RES	(CS42L42_PAGE_29 + 0x03)
+#define CS42L42_ASP_TX_CH1_AP_SHIFT	7
+#define CS42L42_ASP_TX_CH1_AP_MASK	(1 << CS42L42_ASP_TX_CH1_AP_SHIFT)
+#define CS42L42_ASP_TX_CH2_AP_SHIFT	6
+#define CS42L42_ASP_TX_CH2_AP_MASK	(1 << CS42L42_ASP_TX_CH2_AP_SHIFT)
+#define CS42L42_ASP_TX_CH2_RES_SHIFT	2
+#define CS42L42_ASP_TX_CH2_RES_MASK	(3 << CS42L42_ASP_TX_CH2_RES_SHIFT)
+#define CS42L42_ASP_TX_CH1_RES_SHIFT	0
+#define CS42L42_ASP_TX_CH1_RES_MASK	(3 << CS42L42_ASP_TX_CH1_RES_SHIFT)
 #define CS42L42_ASP_TX_CH1_BIT_MSB	(CS42L42_PAGE_29 + 0x04)
 #define CS42L42_ASP_TX_CH1_BIT_LSB	(CS42L42_PAGE_29 + 0x05)
 #define CS42L42_ASP_TX_HIZ_DLY_CFG	(CS42L42_PAGE_29 + 0x06)