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author | Mark Brown <broonie@linaro.org> | 2013-08-07 10:05:04 (GMT) |
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committer | Mark Brown <broonie@linaro.org> | 2013-08-07 10:05:04 (GMT) |
commit | eca2a654b8e9b45680f75f77b716b483f1ecffce (patch) | |
tree | 4a5d3f9f4a552160b7f2b4ddcf3e5144c5251de6 /drivers/regulator/core.c | |
parent | 587cea27e4feee7365b22935b3e19e1e8906e9cb (diff) | |
parent | 550bf89366e068cd6e29c36156f700a02dbb6388 (diff) | |
download | linux-eca2a654b8e9b45680f75f77b716b483f1ecffce.tar.xz |
Merge remote-tracking branch 'regulator/topic/linear-range' into regulator-helpers
Diffstat (limited to 'drivers/regulator/core.c')
-rw-r--r-- | drivers/regulator/core.c | 95 |
1 files changed, 95 insertions, 0 deletions
diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c index 101f7cb..1034e05 100644 --- a/drivers/regulator/core.c +++ b/drivers/regulator/core.c @@ -2084,6 +2084,43 @@ int regulator_list_voltage_linear(struct regulator_dev *rdev, EXPORT_SYMBOL_GPL(regulator_list_voltage_linear); /** + * regulator_list_voltage_linear_range - List voltages for linear ranges + * + * @rdev: Regulator device + * @selector: Selector to convert into a voltage + * + * Regulators with a series of simple linear mappings between voltages + * and selectors can set linear_ranges in the regulator descriptor and + * then use this function as their list_voltage() operation, + */ +int regulator_list_voltage_linear_range(struct regulator_dev *rdev, + unsigned int selector) +{ + const struct regulator_linear_range *range; + int i; + + if (!rdev->desc->n_linear_ranges) { + BUG_ON(!rdev->desc->n_linear_ranges); + return -EINVAL; + } + + for (i = 0; i < rdev->desc->n_linear_ranges; i++) { + range = &rdev->desc->linear_ranges[i]; + + if (!(selector >= range->min_sel && + selector <= range->max_sel)) + continue; + + selector -= range->min_sel; + + return range->min_uV + (range->uV_step * selector); + } + + return -EINVAL; +} +EXPORT_SYMBOL_GPL(regulator_list_voltage_linear_range); + +/** * regulator_list_voltage_table - List voltages with table based mapping * * @rdev: Regulator device @@ -2373,6 +2410,64 @@ int regulator_map_voltage_linear(struct regulator_dev *rdev, } EXPORT_SYMBOL_GPL(regulator_map_voltage_linear); +/** + * regulator_map_voltage_linear - map_voltage() for multiple linear ranges + * + * @rdev: Regulator to operate on + * @min_uV: Lower bound for voltage + * @max_uV: Upper bound for voltage + * + * Drivers providing linear_ranges in their descriptor can use this as + * their map_voltage() callback. + */ +int regulator_map_voltage_linear_range(struct regulator_dev *rdev, + int min_uV, int max_uV) +{ + const struct regulator_linear_range *range; + int ret = -EINVAL; + int voltage, i; + + if (!rdev->desc->n_linear_ranges) { + BUG_ON(!rdev->desc->n_linear_ranges); + return -EINVAL; + } + + for (i = 0; i < rdev->desc->n_linear_ranges; i++) { + range = &rdev->desc->linear_ranges[i]; + + if (!(min_uV <= range->max_uV && max_uV >= range->min_uV)) + continue; + + if (min_uV <= range->min_uV) + min_uV = range->min_uV; + + /* range->uV_step == 0 means fixed voltage range */ + if (range->uV_step == 0) { + ret = 0; + } else { + ret = DIV_ROUND_UP(min_uV - range->min_uV, + range->uV_step); + if (ret < 0) + return ret; + } + + ret += range->min_sel; + + break; + } + + if (i == rdev->desc->n_linear_ranges) + return -EINVAL; + + /* 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_range); + static int _regulator_do_set_voltage(struct regulator_dev *rdev, int min_uV, int max_uV) { |