Some consumers, e.g., the mmc subsystem, can benefit from an ability to
check, whether a regulator can switch power on and off.
Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@xxxxxx>
Cc: Mark Brown <broonie@xxxxxxxxxxxxxxxxxxxxxxxxxxx>
---
drivers/regulator/core.c | 17 +++++++++++++++++
include/linux/regulator/consumer.h | 7 +++++++
2 files changed, 24 insertions(+), 0 deletions(-)
diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index a57defb..ec4cc0b 100644
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -1447,6 +1447,23 @@ static int _regulator_can_change_status(struct regulator_dev *rdev)
return 0;
}
+bool regulator_can_change_status(struct regulator *regulator)
+{
+ struct regulator_dev *rdev;
+ int ret;
+
+ if (IS_ERR_OR_NULL(regulator))
+ return false;
+
+ rdev = regulator->rdev;
+ mutex_lock(&rdev->mutex);
+ ret = _regulator_can_change_status(rdev);
+ mutex_unlock(&rdev->mutex);
+
+ return ret && !rdev->constraints->always_on;
+}
+EXPORT_SYMBOL_GPL(regulator_can_change_status);
+
/* locks held by regulator_enable() */
static int _regulator_enable(struct regulator_dev *rdev)
{
diff --git a/include/linux/regulator/consumer.h b/include/linux/regulator/consumer.h
index 4ed1b30..a15a476 100644
--- a/include/linux/regulator/consumer.h
+++ b/include/linux/regulator/consumer.h
@@ -177,6 +177,8 @@ int regulator_set_mode(struct regulator *regulator, unsigned int mode);
unsigned int regulator_get_mode(struct regulator *regulator);
int regulator_set_optimum_mode(struct regulator *regulator, int load_uA);
+bool regulator_can_change_status(struct regulator *regulator);
+
/* regulator notifier block */
int regulator_register_notifier(struct regulator *regulator,
struct notifier_block *nb);
@@ -344,6 +346,11 @@ static inline void regulator_set_drvdata(struct regulator *regulator,
{
}
+static inline bool regulator_can_change_status(struct regulator *regulator)
+{
+ return false;
+}
+
#endif
#endif
--
1.7.2.5
--
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