diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/regulator/core.c | 53 |
1 files changed, 53 insertions, 0 deletions
diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c index 5e32698..5751f5e 100644 --- a/drivers/regulator/core.c +++ b/drivers/regulator/core.c @@ -1860,6 +1860,26 @@ int regulator_count_voltages(struct regulator *regulator) EXPORT_SYMBOL_GPL(regulator_count_voltages); /** + * regulator_list_voltage_linear - List voltages with simple calculation + * + * @rdev: Regulator device + * @selector: Selector to convert into a voltage + * + * Regulators with a simple linear mapping between voltages and + * selectors can set min_uV and uV_step in the regulator descriptor + * and then use this function as their list_voltage() operation, + */ +int regulator_list_voltage_linear(struct regulator_dev *rdev, + unsigned int selector) +{ + if (selector >= rdev->desc->n_voltages) + return -EINVAL; + + return rdev->desc->min_uV + (rdev->desc->uV_step * selector); +} +EXPORT_SYMBOL_GPL(regulator_list_voltage_linear); + +/** * regulator_list_voltage - enumerate supported voltages * @regulator: regulator source * @selector: identify voltage to list @@ -2007,6 +2027,39 @@ int regulator_map_voltage_iterate(struct regulator_dev *rdev, } EXPORT_SYMBOL_GPL(regulator_map_voltage_iterate); +/** + * regulator_map_voltage_linear - map_voltage() for simple linear mappings + * + * @rdev: Regulator to operate on + * @min_uV: Lower bound for voltage + * @max_uV: Upper bound for voltage + * + * Drivers providing min_uV and uV_step in their regulator_desc can + * use this as their map_voltage() operation. + */ +int regulator_map_voltage_linear(struct regulator_dev *rdev, + int min_uV, int max_uV) +{ + int ret, voltage; + + if (!rdev->desc->uV_step) { + BUG_ON(!rdev->desc->uV_step); + return -EINVAL; + } + + ret = (min_uV - rdev->desc->min_uV) / rdev->desc->uV_step; + if (ret < 0) + return ret; + + /* Map back into a voltage to verify we're still in bounds */ + voltage = rdev->desc->ops->list_voltage(rdev, ret); + if (voltage < min_uV || voltage > max_uV) + return -EINVAL; + + return ret; +} +EXPORT_SYMBOL_GPL(regulator_map_voltage_linear); + static int _regulator_do_set_voltage(struct regulator_dev *rdev, int min_uV, int max_uV) { |