If we reverse some of the logic and change the formula used, we can simplify the function greatly.
Signed-off-by: Lee Jones <[email protected]> --- drivers/regulator/pwm-regulator.c | 27 +++++++-------------------- 1 file changed, 7 insertions(+), 20 deletions(-) diff --git a/drivers/regulator/pwm-regulator.c b/drivers/regulator/pwm-regulator.c index b37b616..d5cb267 100644 --- a/drivers/regulator/pwm-regulator.c +++ b/drivers/regulator/pwm-regulator.c @@ -93,26 +93,13 @@ static int pwm_regulator_list_voltage(struct regulator_dev *rdev, /** * Continuous voltage call-backs */ -static int pwm_voltage_to_duty_cycle(struct regulator_dev *rdev, - int volt_mV) +static int pwm_voltage_to_duty_cycle(struct regulator_dev *rdev, int req_uV) { - struct pwm_regulator_data *drvdata = rdev_get_drvdata(rdev); - int min_mV = rdev->constraints->min_uV / 1000; - int max_mV = rdev->constraints->max_uV / 1000; - int max_duty_cycle = drvdata->max_duty_cycle; - int vdiff = min_mV - max_mV; - int pwm_code; - int tmp; - - tmp = max_duty_cycle - min_mV * max_duty_cycle / vdiff; - pwm_code = tmp + max_duty_cycle * volt_mV / vdiff; - - if (pwm_code < 0) - pwm_code = 0; - if (pwm_code > max_duty_cycle) - pwm_code = max_duty_cycle; - - return pwm_code * 100 / max_duty_cycle; + int min_uV = rdev->constraints->min_uV; + int max_uV = rdev->constraints->max_uV; + int diff = max_uV - min_uV; + + return 100 - ((((req_uV * 100) - (min_uV * 100)) / diff)); } static int pwm_regulator_get_voltage(struct regulator_dev *rdev) @@ -131,7 +118,7 @@ static int pwm_regulator_set_voltage(struct regulator_dev *rdev, int duty_cycle; int ret; - duty_cycle = pwm_voltage_to_duty_cycle(rdev, min_uV / 1000); + duty_cycle = pwm_voltage_to_duty_cycle(rdev, min_uV); ret = pwm_config(drvdata->pwm, (drvdata->pwm->period / 100) * duty_cycle, -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
