[PATCH v3 4/4] ALSA: hda/cirrus: Add Headphone and Headset MIC Volume Control

[Pierre-Louis Bossart]

On 3/6/21 5:19 AM, Vitaly Rodionov wrote:
> From: Stefan Binding <sbinding at opensource.cirrus.com>
> 
> CS8409 does not support Volume Control for NIDs 0x24 (the Headphones),
> or 0x34 (The Headset Mic).
> However, CS42L42 codec does support gain control for both.

Volume Control for both

> We can add support for Volume Controls, by writing the the CS42L42
> regmap via i2c commands, using custom info, get and put volume
> functions, saved in the control.
> 
> Tested on DELL Inspiron-3500, DELL Inspiron-3501, DELL Inspiron-3500
> 
> Signed-off-by: Stefan Binding <sbinding at opensource.cirrus.com>
> Signed-off-by: Vitaly Rodionov <vitalyr at opensource.cirrus.com>
> ---
> 
> Changes in v3:
> - Added restore volumes after resume
> - Removed redundant debug logging after testing
> 
> 
>   sound/pci/hda/patch_cirrus.c | 200 +++++++++++++++++++++++++++++++++++
>   1 file changed, 200 insertions(+)
> 
> diff --git a/sound/pci/hda/patch_cirrus.c b/sound/pci/hda/patch_cirrus.c
> index 1d2f6a1224e6..6a9e5c803977 100644
> --- a/sound/pci/hda/patch_cirrus.c
> +++ b/sound/pci/hda/patch_cirrus.c
> @@ -21,6 +21,9 @@
>   /*
>    */
>   
> +#define CS42L42_HP_CH     (2U)
> +#define CS42L42_HS_MIC_CH (1U)
> +
>   struct cs_spec {
>   	struct hda_gen_spec gen;
>   
> @@ -42,6 +45,9 @@ struct cs_spec {
>   
>   	unsigned int cs42l42_hp_jack_in:1;
>   	unsigned int cs42l42_mic_jack_in:1;
> +	unsigned int cs42l42_volume_init:1;

can you describe what this field is? it looks like it's only tracking a 
one-time initialization?

> +	char cs42l42_hp_volume[CS42L42_HP_CH];
> +	char cs42l42_hs_mic_volume[CS42L42_HS_MIC_CH];
>   
>   	struct mutex cs8409_i2c_mux;
>   
> @@ -1260,6 +1266,14 @@ static int patch_cs4213(struct hda_codec *codec)
>   #define CIR_I2C_QWRITE	0x005D
>   #define CIR_I2C_QREAD	0x005E
>   
> +#define CS8409_CS42L42_HP_VOL_REAL_MIN   (-63)
> +#define CS8409_CS42L42_HP_VOL_REAL_MAX   (0)
> +#define CS8409_CS42L42_AMIC_VOL_REAL_MIN (-97)
> +#define CS8409_CS42L42_AMIC_VOL_REAL_MAX (12)
> +#define CS8409_CS42L42_REG_HS_VOLUME_CHA (0x2301)
> +#define CS8409_CS42L42_REG_HS_VOLUME_CHB (0x2303)
> +#define CS8409_CS42L42_REG_AMIC_VOLUME   (0x1D03)
> +
>   struct cs8409_i2c_param {
>   	unsigned int addr;
>   	unsigned int reg;
> @@ -1580,6 +1594,165 @@ static unsigned int cs8409_i2c_write(struct hda_codec *codec,
>   	return retval;
>   }
>   
> +static int cs8409_cs42l42_volume_info(struct snd_kcontrol *kcontrol,
> +				  struct snd_ctl_elem_info *uinfo)
> +{
> +	struct hda_codec *codec = snd_kcontrol_chip(kcontrol);
> +	u16 nid = get_amp_nid(kcontrol);
> +	u8 chs = get_amp_channels(kcontrol);
> +
> +	codec_dbg(codec, "%s() nid: %d\n", __func__, nid);
> +	switch (nid) {
> +	case CS8409_CS42L42_HP_PIN_NID:
> +		uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
> +		uinfo->count = chs == 3 ? 2 : 1;
> +		uinfo->value.integer.min = CS8409_CS42L42_HP_VOL_REAL_MIN;
> +		uinfo->value.integer.max = CS8409_CS42L42_HP_VOL_REAL_MAX;
> +		break;
> +	case CS8409_CS42L42_AMIC_PIN_NID:
> +		uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
> +		uinfo->count = chs == 3 ? 2 : 1;
> +		uinfo->value.integer.min = CS8409_CS42L42_AMIC_VOL_REAL_MIN;
> +		uinfo->value.integer.max = CS8409_CS42L42_AMIC_VOL_REAL_MAX;
> +		break;
> +	default:
> +		break;
> +	}
> +	return 0;
> +}
> +
> +static void cs8409_cs42l42_update_volume(struct hda_codec *codec)
> +{
> +	struct cs_spec *spec = codec->spec;
> +
> +	mutex_lock(&spec->cs8409_i2c_mux);
> +	spec->cs42l42_hp_volume[0] = -(cs8409_i2c_read(codec, CS42L42_I2C_ADDR,
> +				CS8409_CS42L42_REG_HS_VOLUME_CHA, 1));
> +	spec->cs42l42_hp_volume[1] = -(cs8409_i2c_read(codec, CS42L42_I2C_ADDR,
> +				CS8409_CS42L42_REG_HS_VOLUME_CHB, 1));
> +	spec->cs42l42_hs_mic_volume[0] = -(cs8409_i2c_read(codec, CS42L42_I2C_ADDR,
> +				CS8409_CS42L42_REG_AMIC_VOLUME, 1));
> +	mutex_unlock(&spec->cs8409_i2c_mux);
> +	spec->cs42l42_volume_init = 1;
> +}
> +
> +static int cs8409_cs42l42_volume_get(struct snd_kcontrol *kcontrol,
> +				 struct snd_ctl_elem_value *ucontrol)
> +{
> +	struct hda_codec *codec = snd_kcontrol_chip(kcontrol);
> +	struct cs_spec *spec = codec->spec;
> +	hda_nid_t nid = get_amp_nid(kcontrol);
> +	int chs = get_amp_channels(kcontrol);
> +	long *valp = ucontrol->value.integer.value;
> +
> +	if (!spec->cs42l42_volume_init) {
> +		snd_hda_power_up(codec);
> +		cs8409_cs42l42_update_volume(codec);
> +		snd_hda_power_down(codec);
> +	}
> +	switch (nid) {
> +	case CS8409_CS42L42_HP_PIN_NID:
> +		if (chs & 1)

BIT(0)?

> +			*valp++ = spec->cs42l42_hp_volume[0];
> +		if (chs & 2)

BIT(1)?

> +			*valp++ = spec->cs42l42_hp_volume[1];
> +		break;