[PATCH 2/6] ASoC: tas2770: Add shutdown capability via a GPIO

[Dan Murphy]

Add the hardware shutdown mechanism to shutdown and wake up the device
via a GPIO.

Signed-off-by: Dan Murphy <dmur...@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