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leds: pwm-multicolor: Support active-low LEDs

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Add support for LEDs wired up to light when the PWM output is low, just
like the regular PWM LEDs.

Signed-off-by: Emil Renner Berthing <emil.renner.berthing@canonical.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Pavel Machek <pavel@ucw.cz>
This commit is contained in:
Emil Renner Berthing 2022-07-05 23:01:42 +02:00 committed by Pavel Machek
parent 83543c6e54
commit 3dd7ed589f
1 changed files with 5 additions and 0 deletions
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5
drivers/leds/rgb/leds-pwm-multicolor.c
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@ -19,6 +19,7 @@
struct pwm_led {
struct pwm_device *pwm;
struct pwm_state state;
bool active_low;
};
struct pwm_mc_led {
@ -45,6 +46,9 @@ static int led_pwm_mc_set(struct led_classdev *cdev,
duty *= mc_cdev->subled_info[i].brightness;
do_div(duty, cdev->max_brightness);
if (priv->leds[i].active_low)
duty = priv->leds[i].state.period - duty;
priv->leds[i].state.duty_cycle = duty;
priv->leds[i].state.enabled = duty > 0;
ret = pwm_apply_state(priv->leds[i].pwm,
@ -76,6 +80,7 @@ static int iterate_subleds(struct device *dev, struct pwm_mc_led *priv,
goto release_fwnode;
}
pwm_init_state(pwmled->pwm, &pwmled->state);
pwmled->active_low = fwnode_property_read_bool(fwnode, "active-low");
ret = fwnode_property_read_u32(fwnode, "color", &color);
if (ret) {