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authorGregor Boirie <gregor.boirie@parrot.com>2016-03-03 13:44:05 +0300
committerJonathan Cameron <jic23@kernel.org>2016-03-05 18:25:58 +0300
commit63d5d525cbbc8938d9fa3d6d6fbd4183e784b6e9 (patch)
tree1435d337719dc1786c2f203da17964e4e88e5db2 /drivers/iio/magnetometer/ak8975.c
parentd3546af67f4937075d0747adb3bf56d3c46b32f0 (diff)
downloadlinux-63d5d525cbbc8938d9fa3d6d6fbd4183e784b6e9.tar.xz
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/ak8975.c')
-rw-r--r--drivers/iio/magnetometer/ak8975.c16
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