Some PWM outputs are wired such that the LED they're controlling is connected to supply rather than ground. These PWMs may not support output inversion, or when they do, disabling the PWM may set the PWM output low, causing a "brightness" value of zero to turn the LED fully on. The platform data for this driver already indicates that this was thought about, and we have the "active_low" property there already. However, the implementation for this is missing. Add the trivial implementation for this feature. Signed-off-by: Russell King <rmk+kernel@xxxxxxxxxxxxxxxx> --- drivers/leds/leds-pwm.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/leds/leds-pwm.c b/drivers/leds/leds-pwm.c index e1b4c23a409a..1d47742c551f 100644 --- a/drivers/leds/leds-pwm.c +++ b/drivers/leds/leds-pwm.c @@ -70,6 +70,10 @@ static void led_pwm_set(struct led_classdev *led_cdev, duty *= brightness; do_div(duty, max); + + if (led_dat->active_low) + duty = led_dat->period - duty; + led_dat->duty = duty; if (led_dat->can_sleep) -- 1.8.3.1 -- To unsubscribe from this list: send the line "unsubscribe linux-leds" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
