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Subject[PATCH 2/6] ASoC: tas2770: Add shutdown capability via a GPIO
Date
Add the hardware shutdown mechanism to shutdown and wake up the device
via a GPIO.

Signed-off-by: Dan Murphy <dmurphy@ti.com>
---
sound/soc/codecs/tas2770.c | 53 ++++++++++++++++++++++++++++----------
sound/soc/codecs/tas2770.h | 1 +
2 files changed, 40 insertions(+), 14 deletions(-)

diff --git a/sound/soc/codecs/tas2770.c b/sound/soc/codecs/tas2770.c
index 386aaa11fa08..9f7363927c50 100644
--- a/sound/soc/codecs/tas2770.c
+++ b/sound/soc/codecs/tas2770.c
@@ -79,28 +79,42 @@ static int tas2770_set_bias_level(struct snd_soc_component *component,
#ifdef CONFIG_PM
static int tas2770_codec_suspend(struct snd_soc_component *component)
{
- int ret;
+ struct tas2770_priv *tas2770 = snd_soc_component_get_drvdata(component);
+ int ret = 0;

- ret = snd_soc_component_update_bits(component, TAS2770_PWR_CTRL,
- TAS2770_PWR_CTRL_MASK,
- TAS2770_PWR_CTRL_SHUTDOWN);
- if (ret < 0)
- return ret;
+ if (tas2770->sdz_gpio) {
+ gpiod_set_value_cansleep(tas2770->sdz_gpio, 0);
+ } else {
+ ret = snd_soc_component_update_bits(component, TAS2770_PWR_CTRL,
+ TAS2770_PWR_CTRL_MASK,
+ TAS2770_PWR_CTRL_SHUTDOWN);
+ if (ret < 0)
+ return ret;

- return 0;
+ ret = 0;
+ }
+
+ return ret;
}

static int tas2770_codec_resume(struct snd_soc_component *component)
{
- int ret;
+ struct tas2770_priv *tas2770 = snd_soc_component_get_drvdata(component);
+ int ret = 0;

- ret = snd_soc_component_update_bits(component, TAS2770_PWR_CTRL,
- TAS2770_PWR_CTRL_MASK,
- TAS2770_PWR_CTRL_ACTIVE);
- if (ret < 0)
- return ret;
+ if (tas2770->sdz_gpio) {
+ gpiod_set_value_cansleep(tas2770->sdz_gpio, 1);
+ } else {
+ ret = snd_soc_component_update_bits(component, TAS2770_PWR_CTRL,
+ TAS2770_PWR_CTRL_MASK,
+ TAS2770_PWR_CTRL_ACTIVE);
+ if (ret < 0)
+ return ret;

- return 0;
+ ret = 0;
+ }
+
+ return ret;
}
#else
#define tas2770_codec_suspend NULL
@@ -498,6 +512,9 @@ static int tas2770_codec_probe(struct snd_soc_component *component)

tas2770->component = component;

+ if (tas2770->sdz_gpio)
+ gpiod_set_value_cansleep(tas2770->sdz_gpio, 1);
+
tas2770_reset(tas2770);

return 0;
@@ -650,6 +667,14 @@ static int tas2770_parse_dt(struct device *dev, struct tas2770_priv *tas2770)
tas2770->v_sense_slot = 2;
}

+ tas2770->sdz_gpio = devm_gpiod_get_optional(dev, "shutdown", GPIOD_OUT_HIGH);
+ if (IS_ERR(tas2770->sdz_gpio)) {
+ if (PTR_ERR(tas2770->sdz_gpio) == -EPROBE_DEFER)
+ return -EPROBE_DEFER;
+
+ tas2770->sdz_gpio = NULL;
+ }
+
return 0;
}

diff --git a/sound/soc/codecs/tas2770.h b/sound/soc/codecs/tas2770.h
index 07e3556fc702..b3fc4a487033 100644
--- a/sound/soc/codecs/tas2770.h
+++ b/sound/soc/codecs/tas2770.h
@@ -134,6 +134,7 @@ struct tas2770_priv {
int power_state;
int asi_format;
struct gpio_desc *reset_gpio;
+ struct gpio_desc *sdz_gpio;
int sampling_rate;
int channel_size;
int slot_width;
--
2.28.0
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