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leds-gpio: Implement the brightness_get method

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The power LED uses some clever logic that means it is driven
by a voltage measuring circuit when configured as input, otherwise
it is driven by the GPIO output value. This patch wires up the
brightness_get method for leds-gpio so that user-space can monitor
the LED value via /sys/class/gpio/led1/brightness. Using the input
trigger this returns an indication of the system power health,
otherwise it is just whatever value the trigger has written most
recently.

See: https://github.com/raspberrypi/linux/issues/1064
This commit is contained in:
Phil Elwell
2015-07-15 13:46:08 +01:00
committed by popcornmix
parent 50521168f2
commit 29bb619a23
1 changed files with 8 additions and 0 deletions
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8
drivers/leds/leds-gpio.c
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@@ -82,6 +82,13 @@ static void gpio_led_set(struct led_classdev *led_cdev,
}
}
static enum led_brightness gpio_led_get(struct led_classdev *led_cdev)
{
struct gpio_led_data *led_dat =
container_of(led_cdev, struct gpio_led_data, cdev);
return gpiod_get_value_cansleep(led_dat->gpiod) ? LED_FULL : LED_OFF;
}
static int gpio_blink_set(struct led_classdev *led_cdev,
unsigned long *delay_on, unsigned long *delay_off)
{
@@ -138,6 +145,7 @@ static int create_gpio_led(const struct gpio_led *template,
led_dat->cdev.blink_set = gpio_blink_set;
}
led_dat->cdev.brightness_set = gpio_led_set;
led_dat->cdev.brightness_get = gpio_led_get;
if (template->default_state == LEDS_GPIO_DEFSTATE_KEEP)
state = !!gpiod_get_value_cansleep(led_dat->gpiod);
else