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 <[email protected]> Cc: Mark Brown <[email protected]> --- 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 -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
