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regulator: core: Add regulator_map_voltage_ascend() API 

A lot of regulator hardware has ascendant voltage list.
This patch adds regulator_map_voltage_ascend() and export it.

Drivers that have ascendant voltage list can use this as their map_voltage()
operation, this is more efficient than default regulator_map_voltage_iterate()
function.

Signed-off-by: Axel Lin <axel.lin@ingics.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
This commit is contained in:
Axel Lin 2013-04-18 10:34:49 +08:00 committed by Mark Brown
parent 41ef2d5678
commit fcf371ee56
2 changed files with 33 additions and 0 deletions
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31
drivers/regulator/core.c
View File

@ -2137,6 +2137,37 @@ int regulator_map_voltage_iterate(struct regulator_dev *rdev,
}
EXPORT_SYMBOL_GPL(regulator_map_voltage_iterate);
/**
* regulator_map_voltage_ascend - map_voltage() for ascendant voltage list
*
* @rdev: Regulator to operate on
* @min_uV: Lower bound for voltage
* @max_uV: Upper bound for voltage
*
* Drivers that have ascendant voltage list can use this as their
* map_voltage() operation.
*/
int regulator_map_voltage_ascend(struct regulator_dev *rdev,
int min_uV, int max_uV)
{
int i, ret;
for (i = 0; i < rdev->desc->n_voltages; i++) {
ret = rdev->desc->ops->list_voltage(rdev, i);
if (ret < 0)
continue;
if (ret > max_uV)
break;
if (ret >= min_uV && ret <= max_uV)
return i;
}
return -EINVAL;
}
EXPORT_SYMBOL_GPL(regulator_map_voltage_ascend);
/**
* regulator_map_voltage_linear - map_voltage() for simple linear mappings
*

2
include/linux/regulator/driver.h
View File

@ -329,6 +329,8 @@ int regulator_map_voltage_linear(struct regulator_dev *rdev,
int min_uV, int max_uV);
int regulator_map_voltage_iterate(struct regulator_dev *rdev,
int min_uV, int max_uV);
int regulator_map_voltage_ascend(struct regulator_dev *rdev,
int min_uV, int max_uV);
int regulator_get_voltage_sel_regmap(struct regulator_dev *rdev);
int regulator_set_voltage_sel_regmap(struct regulator_dev *rdev, unsigned sel);
int regulator_is_enabled_regmap(struct regulator_dev *rdev);