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ASoC: tas6424: Add support for the mute pin

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mute can be connected to GPIO. In that case we have to drive it to the
correct value

Signed-off-by: Jean-Jacques Hiblot <jjhiblot@ti.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Jean-Jacques Hiblot 2018-04-27 15:55:48 +02:00 committed by Mark Brown
parent e3976aa6fb
commit e969a6d222
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GPG Key ID: 24D68B725D5487D0
2 changed files with 37 additions and 1 deletions
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1
Documentation/devicetree/bindings/sound/ti,tas6424.txt
View File

@ -7,6 +7,7 @@ Required properties:
- reg: I2C slave address
- sound-dai-cells: must be equal to 0
- standby-gpios: GPIO used to shut the TAS6424 down.
- mute-gpios: GPIO used to mute all the outputs
Example:

37
sound/soc/codecs/tas6424.c
View File

@ -45,6 +45,7 @@ struct tas6424_data {
unsigned int last_fault2;
unsigned int last_warn;
struct gpio_desc *standby_gpio;
struct gpio_desc *mute_gpio;
};
/*
@ -251,10 +252,16 @@ static int tas6424_set_dai_tdm_slot(struct snd_soc_dai *dai,
static int tas6424_mute(struct snd_soc_dai *dai, int mute)
{
struct snd_soc_component *component = dai->component;
struct tas6424_data *tas6424 = snd_soc_component_get_drvdata(component);
unsigned int val;
dev_dbg(component->dev, "%s() mute=%d\n", __func__, mute);
if (tas6424->mute_gpio) {
gpiod_set_value_cansleep(tas6424->mute_gpio, mute);
return 0;
}
if (mute)
val = TAS6424_ALL_STATE_MUTE;
else
@ -289,6 +296,7 @@ static int tas6424_power_on(struct snd_soc_component *component)
{
struct tas6424_data *tas6424 = snd_soc_component_get_drvdata(component);
int ret;
u8 chan_states;
ret = regulator_bulk_enable(ARRAY_SIZE(tas6424->supplies),
tas6424->supplies);
@ -305,7 +313,18 @@ static int tas6424_power_on(struct snd_soc_component *component)
return ret;
}
snd_soc_component_write(component, TAS6424_CH_STATE_CTRL, TAS6424_ALL_STATE_MUTE);
if (tas6424->mute_gpio) {
gpiod_set_value_cansleep(tas6424->mute_gpio, 0);
/*
* channels are muted via the mute pin. Don't also mute
* them via the registers so that subsequent register
* access is not necessary to un-mute the channels
*/
chan_states = TAS6424_ALL_STATE_PLAY;
} else {
chan_states = TAS6424_ALL_STATE_MUTE;
}
snd_soc_component_write(component, TAS6424_CH_STATE_CTRL, chan_states);
/* any time we come out of HIZ, the output channels automatically run DC
* load diagnostics, wait here until this completes
@ -645,6 +664,22 @@ static int tas6424_i2c_probe(struct i2c_client *client,
tas6424->standby_gpio = NULL;
}
/*
* Get control of the mute pin and set it HIGH in order to start with
* all the output muted.
* Note: The actual pin polarity is taken care of in the GPIO lib
* according the polarity specified in the DTS.
*/
tas6424->mute_gpio = devm_gpiod_get_optional(dev, "mute",
GPIOD_OUT_HIGH);
if (IS_ERR(tas6424->mute_gpio)) {
if (PTR_ERR(tas6424->mute_gpio) == -EPROBE_DEFER)
return -EPROBE_DEFER;
dev_info(dev, "failed to get nmute GPIO: %ld\n",
PTR_ERR(tas6424->mute_gpio));
tas6424->mute_gpio = NULL;
}
for (i = 0; i < ARRAY_SIZE(tas6424->supplies); i++)
tas6424->supplies[i].supply = tas6424_supply_names[i];
ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(tas6424->supplies),