From d1e7de3007c6e34c5e6d5e1b707b5aba4a1cd57f Mon Sep 17 00:00:00 2001 From: Marek Szyprowski Date: Tue, 4 Dec 2012 15:01:01 +0100 Subject: [PATCH] regulators: add regulator_can_change_voltage() function Introduce a regulator_can_change_voltage() function for the subsytems or drivers which might check if applying voltage change is possible and use special workaround code when the driver is used with fixed regulators or regulators with disabled ability to change the voltage. Signed-off-by: Marek Szyprowski Signed-off-by: Mark Brown --- drivers/regulator/core.c | 22 ++++++++++++++++++++++ include/linux/regulator/consumer.h | 1 + 2 files changed, 23 insertions(+) diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c index e872c8be080e..59e08633372a 100644 --- a/drivers/regulator/core.c +++ b/drivers/regulator/core.c @@ -1866,6 +1866,28 @@ int regulator_is_enabled(struct regulator *regulator) } EXPORT_SYMBOL_GPL(regulator_is_enabled); +/** + * regulator_can_change_voltage - check if regulator can change voltage + * @regulator: regulator source + * + * Returns positive if the regulator driver backing the source/client + * can change its voltage, false otherwise. Usefull for detecting fixed + * or dummy regulators and disabling voltage change logic in the client + * driver. + */ +int regulator_can_change_voltage(struct regulator *regulator) +{ + struct regulator_dev *rdev = regulator->rdev; + + if (rdev->constraints && + rdev->constraints->valid_ops_mask & REGULATOR_CHANGE_VOLTAGE && + rdev->desc->n_voltages > 1) + return 1; + + return 0; +} +EXPORT_SYMBOL_GPL(regulator_can_change_voltage); + /** * regulator_count_voltages - count regulator_list_voltage() selectors * @regulator: regulator source diff --git a/include/linux/regulator/consumer.h b/include/linux/regulator/consumer.h index c43cd3556b1f..5d0f7c10bef1 100644 --- a/include/linux/regulator/consumer.h +++ b/include/linux/regulator/consumer.h @@ -160,6 +160,7 @@ int regulator_bulk_force_disable(int num_consumers, void regulator_bulk_free(int num_consumers, struct regulator_bulk_data *consumers); +int regulator_can_change_voltage(struct regulator *regulator); int regulator_count_voltages(struct regulator *regulator); int regulator_list_voltage(struct regulator *regulator, unsigned selector); int regulator_is_supported_voltage(struct regulator *regulator,