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

[Aren Moynihan]

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 <a...@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