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iio: magn: ak8975: add Vid regulator

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The AK8975 has two power sources: Vdd (analog voltage supply)
and Vid (digital voltage supply). Optionally also obtain the Vid
supply regulator and enable it.

If an error occurs when enabling one of the regulators: bail out.

Cc: Gregor Boirie <gregor.boirie@parrot.com>
Cc: Richard Leitner <dev@g0hl1n.net>
Cc: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Cc: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Linus Walleij 2016-06-29 14:08:34 +02:00 committed by Jonathan Cameron
parent 90e96fdd01
commit b21d3f3452
1 changed files with 15 additions and 0 deletions
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15
drivers/iio/magnetometer/ak8975.c
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@ -379,6 +379,7 @@ struct ak8975_data {
u8 cntl_cache;
struct iio_mount_matrix orientation;
struct regulator *vdd;
struct regulator *vid;
};
/* Enable attached power regulator if any. */
@ -399,6 +400,19 @@ static int ak8975_power_on(struct i2c_client *client)
"Failed to enable specified Vdd supply\n");
return ret;
}
data->vid = devm_regulator_get(&client->dev, "vid");
if (IS_ERR(data->vid)) {
ret = PTR_ERR(data->vid);
} else {
ret = regulator_enable(data->vid);
}
if (ret) {
dev_warn(&client->dev,
"Failed to enable specified Vid supply\n");
return ret;
}
return 0;
}
/* Disable attached power regulator if any. */
@ -407,6 +421,7 @@ static void ak8975_power_off(const struct i2c_client *client)
const struct iio_dev *indio_dev = i2c_get_clientdata(client);
const struct ak8975_data *data = iio_priv(indio_dev);
regulator_disable(data->vid);
regulator_disable(data->vdd);
}