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

[Srinivas Kandagatla]

On 20/10/2019 16:30, Stephan Gerhold wrote:
> 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>


Looks good to me.

Acked-by: Srinivas Kandagatla <srinivas.kandagatla at linaro.org>

> ---
> 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,
>