diff options
Diffstat (limited to 'drivers/leds/leds-pwm.c')
| -rw-r--r-- | drivers/leds/leds-pwm.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/drivers/leds/leds-pwm.c b/drivers/leds/leds-pwm.c index 3ed92f34bd44..4d086e87bc1f 100644 --- a/drivers/leds/leds-pwm.c +++ b/drivers/leds/leds-pwm.c @@ -27,6 +27,7 @@ struct led_pwm_data { struct led_classdev cdev; struct pwm_device *pwm; unsigned int active_low; + unsigned int lth_brightness; unsigned int period; }; @@ -42,7 +43,10 @@ static void led_pwm_set(struct led_classdev *led_cdev, pwm_config(led_dat->pwm, 0, period); pwm_disable(led_dat->pwm); } else { - pwm_config(led_dat->pwm, brightness * period / max, period); + brightness = led_dat->lth_brightness + (brightness * + (led_dat->period - led_dat->lth_brightness) / max); + pwm_config(led_dat->pwm, brightness, led_dat->period); + pwm_enable(led_dat->pwm); } } @@ -79,6 +83,8 @@ static int led_pwm_probe(struct platform_device *pdev) led_dat->cdev.default_trigger = cur_led->default_trigger; led_dat->active_low = cur_led->active_low; led_dat->period = cur_led->pwm_period_ns; + led_dat->lth_brightness = cur_led->lth_brightness * + (cur_led->pwm_period_ns / cur_led->max_brightness); led_dat->cdev.brightness_set = led_pwm_set; led_dat->cdev.brightness = LED_OFF; led_dat->cdev.max_brightness = cur_led->max_brightness; |