openkylin
/
linux
mirror of https://gitee.com/openkylin/linux.git
9
0
Fork 0
Code Issues Projects Releases Wiki Activity

regulator: core: create unlocked version of regulator_set_voltage 

The unlocked version will be needed when we start propagating voltage
changes to the supply regulators.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Sascha Hauer 2015-10-13 12:45:25 +02:00 committed by Mark Brown
parent 3a40cfc36b
commit a9f226bcd9
1 changed files with 34 additions and 23 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

57
drivers/regulator/core.c
View File

@ -2761,33 +2761,14 @@ static int _regulator_do_set_voltage(struct regulator_dev *rdev,
return ret;
}
/**
* regulator_set_voltage - set regulator output voltage
* @regulator: regulator source
* @min_uV: Minimum required voltage in uV
* @max_uV: Maximum acceptable voltage in uV
*
* Sets a voltage regulator to the desired output voltage. This can be set
* during any regulator state. IOW, regulator can be disabled or enabled.
*
* If the regulator is enabled then the voltage will change to the new value
* immediately otherwise if the regulator is disabled the regulator will
* output at the new voltage when enabled.
*
* NOTE: If the regulator is shared between several devices then the lowest
* request voltage that meets the system constraints will be used.
* Regulator system constraints must be set for this regulator before
* calling this function otherwise this call will fail.
*/
int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV)
static int regulator_set_voltage_unlocked(struct regulator *regulator,
int min_uV, int max_uV)
{
struct regulator_dev *rdev = regulator->rdev;
int ret = 0;
int old_min_uV, old_max_uV;
int current_uV;
mutex_lock(&rdev->mutex);
/* If we're setting the same range as last time the change
* should be a noop (some cpufreq implementations use the same
* voltage for multiple frequencies, for example).
@ -2835,12 +2816,42 @@ int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV)
goto out2;
out:
mutex_unlock(&rdev->mutex);
return ret;
out2:
regulator->min_uV = old_min_uV;
regulator->max_uV = old_max_uV;
mutex_unlock(&rdev->mutex);
return ret;
}
/**
* regulator_set_voltage - set regulator output voltage
* @regulator: regulator source
* @min_uV: Minimum required voltage in uV
* @max_uV: Maximum acceptable voltage in uV
*
* Sets a voltage regulator to the desired output voltage. This can be set
* during any regulator state. IOW, regulator can be disabled or enabled.
*
* If the regulator is enabled then the voltage will change to the new value
* immediately otherwise if the regulator is disabled the regulator will
* output at the new voltage when enabled.
*
* NOTE: If the regulator is shared between several devices then the lowest
* request voltage that meets the system constraints will be used.
* Regulator system constraints must be set for this regulator before
* calling this function otherwise this call will fail.
*/
int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV)
{
int ret = 0;
mutex_lock(&regulator->rdev->mutex);
ret = regulator_set_voltage_unlocked(regulator, min_uV, max_uV);
mutex_unlock(&regulator->rdev->mutex);
return ret;
}
EXPORT_SYMBOL_GPL(regulator_set_voltage);