From d1e7de3007c6e34c5e6d5e1b707b5aba4a1cd57f Mon Sep 17 00:00:00 2001 From: Marek Szyprowski Date: Tue, 4 Dec 2012 15:01:01 +0100 Subject: 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 ++++++++++++++++++++++ 1 file changed, 22 insertions(+) (limited to 'drivers/regulator') diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c index e872c8be080..59e08633372 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 -- cgit v1.2.3-70-g09d2