[alsa-devel] [PATCH 2/2] ASoC: msm8916-wcd-analog: Add earpiece

[Stephan Gerhold]

PM8916 supports an earpiece as another (small) speaker.
The earpiece is routed through RX MIX1 similarly to
the headphones, except that RDAC2 MUX is set to RX1.

Signed-off-by: Stephan Gerhold <stephan at gerhold.net>
---
This patch is based on code from the downstream driver
(msm8x16-wcd.c, [1]) with some cleanup.

This enables the earpiece on the Samsung Galaxy A5 (2015),
which has recently gained mainline support in [2].

[1]: https://source.codeaurora.org/quic/la/kernel/msm-3.10/tree/sound/soc/codecs/msm8x16-wcd.c?h=LA.BR.1.2.9.1-02310-8x16.0
[2]: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=1329c1ab0730b521e6cd3051c56a2ff3d55f21e6
---
 sound/soc/codecs/msm8916-wcd-analog.c | 54 ++++++++++++++++++++++++++-
 1 file changed, 52 insertions(+), 2 deletions(-)

diff --git a/sound/soc/codecs/msm8916-wcd-analog.c b/sound/soc/codecs/msm8916-wcd-analog.c
index e3d311fb510e..f53235be77d9 100644
--- a/sound/soc/codecs/msm8916-wcd-analog.c
+++ b/sound/soc/codecs/msm8916-wcd-analog.c
@@ -228,6 +228,10 @@
 #define CDC_A_RX_EAR_CTL			(0xf19E)
 #define RX_EAR_CTL_SPK_VBAT_LDO_EN_MASK		BIT(0)
 #define RX_EAR_CTL_SPK_VBAT_LDO_EN_ENABLE	BIT(0)
+#define RX_EAR_CTL_PA_EAR_PA_EN_MASK		BIT(6)
+#define RX_EAR_CTL_PA_EAR_PA_EN_ENABLE		BIT(6)
+#define RX_EAR_CTL_PA_SEL_MASK			BIT(7)
+#define RX_EAR_CTL_PA_SEL			BIT(7)
 
 #define CDC_A_SPKR_DAC_CTL		(0xf1B0)
 #define SPKR_DAC_CTL_DAC_RESET_MASK	BIT(4)
@@ -312,6 +316,7 @@ static const char *const hph_text[] = { "ZERO", "Switch", };
 static const struct soc_enum hph_enum = SOC_ENUM_SINGLE_VIRT(
 					ARRAY_SIZE(hph_text), hph_text);
 
+static const struct snd_kcontrol_new ear_mux = SOC_DAPM_ENUM("EAR_S", hph_enum);
 static const struct snd_kcontrol_new hphl_mux = SOC_DAPM_ENUM("HPHL", hph_enum);
 static const struct snd_kcontrol_new hphr_mux = SOC_DAPM_ENUM("HPHR", hph_enum);
 
@@ -685,6 +690,34 @@ static int pm8916_wcd_analog_enable_spk_pa(struct snd_soc_dapm_widget *w,
 	return 0;
 }
 
+static int pm8916_wcd_analog_enable_ear_pa(struct snd_soc_dapm_widget *w,
+					    struct snd_kcontrol *kcontrol,
+					    int event)
+{
+	struct snd_soc_component *component = snd_soc_dapm_to_component(w->dapm);
+
+	switch (event) {
+	case SND_SOC_DAPM_PRE_PMU:
+		snd_soc_component_update_bits(component, CDC_A_RX_EAR_CTL,
+				    RX_EAR_CTL_PA_SEL_MASK, RX_EAR_CTL_PA_SEL);
+		break;
+	case SND_SOC_DAPM_POST_PMU:
+		snd_soc_component_update_bits(component, CDC_A_RX_EAR_CTL,
+				    RX_EAR_CTL_PA_EAR_PA_EN_MASK,
+				    RX_EAR_CTL_PA_EAR_PA_EN_ENABLE);
+		break;
+	case SND_SOC_DAPM_POST_PMD:
+		snd_soc_component_update_bits(component, CDC_A_RX_EAR_CTL,
+				    RX_EAR_CTL_PA_EAR_PA_EN_MASK, 0);
+		/* Delay to reduce ear turn off pop */
+		usleep_range(7000, 7100);
+		snd_soc_component_update_bits(component, CDC_A_RX_EAR_CTL,
+				    RX_EAR_CTL_PA_SEL_MASK, 0);
+		break;
+	}
+	return 0;
+}
+
 static const struct reg_default wcd_reg_defaults_2_0[] = {
 	{CDC_A_RX_COM_OCP_CTL, 0xD1},
 	{CDC_A_RX_COM_OCP_COUNT, 0xFF},
@@ -801,12 +834,20 @@ static const struct snd_soc_dapm_route pm8916_wcd_analog_audio_map[] = {
 	{"PDM_TX", NULL, "A_MCLK2"},
 	{"A_MCLK2", NULL, "A_MCLK"},
 
+	/* Earpiece (RX MIX1) */
+	{"EAR", NULL, "EAR_S"},
+	{"EAR_S", "Switch", "EAR PA"},
+	{"EAR PA", NULL, "RX_BIAS"},
+	{"EAR PA", NULL, "HPHL DAC"},
+	{"EAR PA", NULL, "HPHR DAC"},
+	{"EAR PA", NULL, "EAR CP"},
+
 	/* Headset (RX MIX1 and RX MIX2) */
 	{"HEADPHONE", NULL, "HPHL PA"},
 	{"HEADPHONE", NULL, "HPHR PA"},
 
-	{"HPHL PA", NULL, "EAR_HPHL_CLK"},
-	{"HPHR PA", NULL, "EAR_HPHR_CLK"},
+	{"HPHL DAC", NULL, "EAR_HPHL_CLK"},
+	{"HPHR DAC", NULL, "EAR_HPHR_CLK"},
 
 	{"CP", NULL, "NCP_CLK"},
 
@@ -847,11 +888,20 @@ static const struct snd_soc_dapm_widget pm8916_wcd_analog_dapm_widgets[] = {
 	SND_SOC_DAPM_INPUT("AMIC1"),
 	SND_SOC_DAPM_INPUT("AMIC3"),
 	SND_SOC_DAPM_INPUT("AMIC2"),
+	SND_SOC_DAPM_OUTPUT("EAR"),
 	SND_SOC_DAPM_OUTPUT("HEADPHONE"),
 
 	/* RX stuff */
 	SND_SOC_DAPM_SUPPLY("INT_LDO_H", SND_SOC_NOPM, 1, 0, NULL, 0),
 
+	SND_SOC_DAPM_PGA_E("EAR PA", SND_SOC_NOPM,
+			   0, 0, NULL, 0,
+			   pm8916_wcd_analog_enable_ear_pa,
+			   SND_SOC_DAPM_PRE_PMU | SND_SOC_DAPM_POST_PMU |
+			   SND_SOC_DAPM_PRE_PMD | SND_SOC_DAPM_POST_PMD),
+	SND_SOC_DAPM_MUX("EAR_S", SND_SOC_NOPM, 0, 0, &ear_mux),
+	SND_SOC_DAPM_SUPPLY("EAR CP", CDC_A_NCP_EN, 4, 0, NULL, 0),
+
 	SND_SOC_DAPM_PGA("HPHL PA", CDC_A_RX_HPH_CNP_EN, 5, 0, NULL, 0),
 	SND_SOC_DAPM_MUX("HPHL", SND_SOC_NOPM, 0, 0, &hphl_mux),
 	SND_SOC_DAPM_MIXER("HPHL DAC", CDC_A_RX_HPH_L_PA_DAC_CTL, 3, 0, NULL,
-- 
2.23.0