From 87248991a1de28e73dc30057e82d831bc11cdd44 Mon Sep 17 00:00:00 2001 From: Boris Brezillon Date: Tue, 14 Jun 2016 11:13:19 +0200 Subject: [PATCH] regulator: pwm: Properly initialize the ->state field The ->state field is currently initialized to 0, thus referencing the voltage selector at index 0, which might not reflect the current voltage value. If possible, retrieve the current voltage selector from the PWM state, else return -EINVAL. Signed-off-by: Boris Brezillon Tested-by: Brian Norris Tested-by: Heiko Stuebner Acked-by: Mark Brown Signed-off-by: Thierry Reding --- drivers/regulator/pwm-regulator.c | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+) diff --git a/drivers/regulator/pwm-regulator.c b/drivers/regulator/pwm-regulator.c index 7920411057af..7d26d3b0eed6 100644 --- a/drivers/regulator/pwm-regulator.c +++ b/drivers/regulator/pwm-regulator.c @@ -52,10 +52,31 @@ struct pwm_voltages { /** * Voltage table call-backs */ +static void pwm_regulator_init_state(struct regulator_dev *rdev) +{ + struct pwm_regulator_data *drvdata = rdev_get_drvdata(rdev); + struct pwm_state pwm_state; + unsigned int dutycycle; + int i; + + pwm_get_state(drvdata->pwm, &pwm_state); + dutycycle = pwm_get_relative_duty_cycle(&pwm_state, 100); + + for (i = 0; i < rdev->desc->n_voltages; i++) { + if (dutycycle == drvdata->duty_cycle_table[i].dutycycle) { + drvdata->state = i; + return; + } + } +} + static int pwm_regulator_get_voltage_sel(struct regulator_dev *rdev) { struct pwm_regulator_data *drvdata = rdev_get_drvdata(rdev); + if (drvdata->state < 0) + pwm_regulator_init_state(rdev); + return drvdata->state; } @@ -221,6 +242,7 @@ static int pwm_regulator_init_table(struct platform_device *pdev, return ret; } + drvdata->state = -EINVAL; drvdata->duty_cycle_table = duty_cycle_table; memcpy(&drvdata->ops, &pwm_regulator_voltage_table_ops, sizeof(drvdata->ops)); -- 2.20.1