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regulator: core: Check that the selector from map_voltage() is valid 

Lots of regulator drivers have checks in their map_voltage() functions
to verify that the result of the mapping is in the range originally
specified. Factor these out in the core and provide a bit of extra
defensiveness for other drivers by doing the check in the core.

Since we're now doing a list_voltage() earlier move the current mapping
back to a voltage out into the set_voltage() call to save redoing it.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
hifive-unleashed-5.1
Mark Brown 2012-06-26 10:57:51 +01:00
parent c5f3939b8f
commit e113d792d5
1 changed files with 18 additions and 8 deletions
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26
drivers/regulator/core.c
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@ -2040,7 +2040,7 @@ static int _regulator_do_set_voltage(struct regulator_dev *rdev,
{
int ret;
int delay = 0;
int best_val;
int best_val = 0;
unsigned int selector;
int old_selector = -1;
@ -2064,6 +2064,15 @@ static int _regulator_do_set_voltage(struct regulator_dev *rdev,
if (rdev->desc->ops->set_voltage) {
ret = rdev->desc->ops->set_voltage(rdev, min_uV, max_uV,
&selector);
if (ret >= 0) {
if (rdev->desc->ops->list_voltage)
best_val = rdev->desc->ops->list_voltage(rdev,
selector);
else
best_val = _regulator_get_voltage(rdev);
}
} else if (rdev->desc->ops->set_voltage_sel) {
if (rdev->desc->ops->map_voltage) {
ret = rdev->desc->ops->map_voltage(rdev, min_uV,
@ -2079,18 +2088,19 @@ static int _regulator_do_set_voltage(struct regulator_dev *rdev,
}
if (ret >= 0) {
selector = ret;
ret = rdev->desc->ops->set_voltage_sel(rdev, ret);
best_val = rdev->desc->ops->list_voltage(rdev, ret);
if (min_uV <= best_val && max_uV >= best_val) {
selector = ret;
ret = rdev->desc->ops->set_voltage_sel(rdev,
ret);
} else {
ret = -EINVAL;
}
}
} else {
ret = -EINVAL;
}
if (rdev->desc->ops->list_voltage)
best_val = rdev->desc->ops->list_voltage(rdev, selector);
else
best_val = _regulator_get_voltage(rdev);
/* Call set_voltage_time_sel if successfully obtained old_selector */
if (ret == 0 && _regulator_is_enabled(rdev) && old_selector >= 0 &&
rdev->desc->ops->set_voltage_time_sel) {