[PATCH v2 3/6] iio: light: stk3310: Manage LED power supply

Aren Moynihan
2024-04-23T22:41:33Z

The stk3310 and stk3310 chips have an input for power to the infrared
LED. Add support for managing it's state.

Signed-off-by: Aren Moynihan <aren@peacevolution.org>
---
drivers/iio/light/stk3310.c | 23 ++++++++++++++++++++++-
1 file changed, 22 insertions(+), 1 deletion(-)

diff --git a/drivers/iio/light/stk3310.c b/drivers/iio/light/stk3310.c
index a0547eeca3e3..ee1ac95dbc0e 100644
--- a/drivers/iio/light/stk3310.c
+++ b/drivers/iio/light/stk3310.c
@@ -120,6 +120,7 @@ struct stk3310_data {
struct regmap_field *reg_flag_psint;
struct regmap_field *reg_flag_nf;
struct regulator *vdd_reg;
+ struct regulator *led_reg;
};

static const struct iio_event_spec stk3310_events[] = {
@@ -614,6 +615,10 @@ static int stk3310_probe(struct i2c_client *client)
if (IS_ERR(data->vdd_reg))
return dev_err_probe(&client->dev, ret, "get regulator vdd failed\n");

+ data->led_reg = devm_regulator_get(&client->dev, "leda");
+ if (IS_ERR(data->led_reg))
+ return dev_err_probe(&client->dev, ret, "get regulator led failed\n");
+
ret = stk3310_regmap_init(data);
if (ret < 0)
return ret;
@@ -629,12 +634,18 @@ static int stk3310_probe(struct i2c_client *client)
return dev_err_probe(&client->dev, ret,
"regulator vdd enable failed\n");

+ ret = regulator_enable(data->led_reg);
+ if (ret) {
+ dev_err_probe(&client->dev, ret, "regulator led enable failed\n");
+ goto err_vdd_disable;
+ }
+
/* we need a short delay to allow the chip time to power on */
fsleep(1000);

ret = stk3310_init(indio_dev);
if (ret < 0)
- goto err_vdd_disable;
+ goto err_led_disable;

if (client->irq > 0) {
ret = devm_request_threaded_irq(&client->dev, client->irq,
@@ -660,6 +671,8 @@ static int stk3310_probe(struct i2c_client *client)

err_standby:
stk3310_set_state(data, STK3310_STATE_STANDBY);
+err_led_disable:
+ regulator_disable(data->led_reg);
err_vdd_disable:
regulator_disable(data->vdd_reg);
return ret;
@@ -672,6 +685,7 @@ static void stk3310_remove(struct i2c_client *client)

iio_device_unregister(indio_dev);
stk3310_set_state(iio_priv(indio_dev), STK3310_STATE_STANDBY);
+ regulator_disable(data->led_reg);
regulator_disable(data->vdd_reg);
}

@@ -687,6 +701,7 @@ static int stk3310_suspend(struct device *dev)
return ret;

regcache_mark_dirty(data->regmap);
+ regulator_disable(data->led_reg);
regulator_disable(data->vdd_reg);

return 0;
@@ -706,6 +721,12 @@ static int stk3310_resume(struct device *dev)
return ret;
}

+ ret = regulator_enable(data->led_reg);
+ if (ret) {
+ dev_err(dev, "Failed to re-enable regulator led\n");
+ return ret;
+ }
+
fsleep(1000);

ret = regcache_sync(data->regmap);
--
2.44.0