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| author | Gregor Boirie <gregor.boirie@parrot.com> | 2016-03-03 11:44:05 +0100 |
|---|---|---|
| committer | Jonathan Cameron <jic23@kernel.org> | 2016-03-05 15:25:58 +0000 |
| commit | 63d5d525cbbc8938d9fa3d6d6fbd4183e784b6e9 (patch) | |
| tree | 1435d337719dc1786c2f203da17964e4e88e5db2 /drivers/iio/magnetometer | |
| parent | d3546af67f4937075d0747adb3bf56d3c46b32f0 (diff) | |
| download | linux-63d5d525cbbc8938d9fa3d6d6fbd4183e784b6e9.tar.gz | |
iio:magnetometer:ak8975: power regulator support
Add support for an optional regulator which, if found into device-tree, will power on device at probing time. The regulator is declared into ak8975 DTS entry as a "vdd-supply" property. Signed-off-by: Gregor Boirie <gregor.boirie@parrot.com> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Diffstat (limited to 'drivers/iio/magnetometer')
| -rw-r--r-- | drivers/iio/magnetometer/ak8975.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/drivers/iio/magnetometer/ak8975.c b/drivers/iio/magnetometer/ak8975.c index 896b13e39dae..72c03d9fbeb2 100644 --- a/drivers/iio/magnetometer/ak8975.c +++ b/drivers/iio/magnetometer/ak8975.c @@ -32,6 +32,7 @@ #include <linux/gpio.h> #include <linux/of_gpio.h> #include <linux/acpi.h> +#include <linux/regulator/consumer.h> #include <linux/iio/iio.h> #include <linux/iio/sysfs.h> @@ -379,8 +380,23 @@ static int ak8975_who_i_am(struct i2c_client *client, enum asahi_compass_chipset type) { u8 wia_val[2]; + struct regulator *vdd = devm_regulator_get_optional(&client->dev, + "vdd"); int ret; + /* Enable attached regulator if any. */ + if (!IS_ERR(vdd)) { + ret = regulator_enable(vdd); + if (ret) { + dev_err(&client->dev, "Failed to enable Vdd supply\n"); + return ret; + } + } else { + ret = PTR_ERR(vdd); + if (ret != -ENODEV) + return ret; + } + /* * Signature for each device: * Device | WIA1 | WIA2 |