2015-12-17 09:29:22 +00:00
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From 8cd2f9b0457191f87ad4305a591a047bd6833f97 Mon Sep 17 00:00:00 2001
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2015-08-17 06:04:32 +00:00
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From: Phil Elwell <phil@raspberrypi.org>
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Date: Wed, 15 Jul 2015 13:46:08 +0100
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2015-12-17 09:29:22 +00:00
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Subject: [PATCH 123/222] leds-gpio: Implement the brightness_get method
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2015-08-17 06:04:32 +00:00
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The power LED uses some clever logic that means it is driven
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by a voltage measuring circuit when configured as input, otherwise
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it is driven by the GPIO output value. This patch wires up the
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brightness_get method for leds-gpio so that user-space can monitor
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the LED value via /sys/class/gpio/led1/brightness. Using the input
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trigger this returns an indication of the system power health,
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otherwise it is just whatever value the trigger has written most
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recently.
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See: https://github.com/raspberrypi/linux/issues/1064
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---
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drivers/leds/leds-gpio.c | 8 ++++++++
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1 file changed, 8 insertions(+)
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--- a/drivers/leds/leds-gpio.c
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+++ b/drivers/leds/leds-gpio.c
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@@ -82,6 +82,13 @@ static void gpio_led_set(struct led_clas
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}
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}
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+static enum led_brightness gpio_led_get(struct led_classdev *led_cdev)
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+{
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+ struct gpio_led_data *led_dat =
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+ container_of(led_cdev, struct gpio_led_data, cdev);
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+ return gpiod_get_value_cansleep(led_dat->gpiod) ? LED_FULL : LED_OFF;
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+}
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+
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static int gpio_blink_set(struct led_classdev *led_cdev,
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unsigned long *delay_on, unsigned long *delay_off)
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{
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@@ -138,6 +145,7 @@ static int create_gpio_led(const struct
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led_dat->cdev.blink_set = gpio_blink_set;
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}
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led_dat->cdev.brightness_set = gpio_led_set;
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+ led_dat->cdev.brightness_get = gpio_led_get;
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if (template->default_state == LEDS_GPIO_DEFSTATE_KEEP)
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state = !!gpiod_get_value_cansleep(led_dat->gpiod);
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else
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