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authorMarek Szyprowski <m.szyprowski@samsung.com>2012-12-04 14:01:01 (GMT)
committerMark Brown <broonie@opensource.wolfsonmicro.com>2012-12-06 06:13:34 (GMT)
commitd1e7de3007c6e34c5e6d5e1b707b5aba4a1cd57f (patch)
tree120c74589f1b69477d1568c07057bdc0ded426e1 /drivers/regulator
parent9489e9dcae718d5fde988e4a684a0f55b5f94d17 (diff)
downloadlinux-d1e7de3007c6e34c5e6d5e1b707b5aba4a1cd57f.tar.xz
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 <m.szyprowski@samsung.com> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Diffstat (limited to 'drivers/regulator')
-rw-r--r--drivers/regulator/core.c22
1 files changed, 22 insertions, 0 deletions
diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index e872c8b..59e0863 100644
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -1867,6 +1867,28 @@ 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
*