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@xxxxxx>
---
.../devicetree/bindings/sound/ti,tas6424.txt | 1 +
sound/soc/codecs/tas6424.c | 37 +++++++++++++++++++++-
2 files changed, 37 insertions(+), 1 deletion(-)
diff --git a/Documentation/devicetree/bindings/sound/ti,tas6424.txt b/Documentation/devicetree/bindings/sound/ti,tas6424.txt
index 82c6d48..527e356 100644
--- a/Documentation/devicetree/bindings/sound/ti,tas6424.txt
+++ b/Documentation/devicetree/bindings/sound/ti,tas6424.txt
@@ -9,6 +9,7 @@ Required properties:
- disable-auto-diagnostics: disable DC auto diagnostics (faster power
on, but less safe as shortage won't be detected)
- standby-gpio: GPIO used to shut the TAS6424 down.
+ - mute-gpio: GPIO used to mute all the outputs
Example:
diff --git a/sound/soc/codecs/tas6424.c b/sound/soc/codecs/tas6424.c
index 926259a..cf84b1c 100644
--- a/sound/soc/codecs/tas6424.c
+++ b/sound/soc/codecs/tas6424.c
@@ -46,6 +46,7 @@ struct tas6424_data {
unsigned int last_warn;
bool no_auto_diags;
struct gpio_desc *standby_gpio;
+ struct gpio_desc *mute_gpio;
};
/*
@@ -252,10 +253,16 @@ 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 ? 1 : 0);
+ return 0;
+ }
+
if (mute)
val = TAS6424_ALL_STATE_MUTE;
else
@@ -290,6 +297,7 @@ 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);
@@ -306,7 +314,18 @@ 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. 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
@@ -650,6 +669,22 @@ 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),
--
2.7.4
--
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