+++ /dev/null
-From 7181db1685aa67e127f80fe9607270d3c87aa3b9 Mon Sep 17 00:00:00 2001
-From: Phil Elwell <phil@raspberrypi.org>
-Date: Fri, 6 Feb 2015 13:50:57 +0000
-Subject: [PATCH] BCM270x_DT: Add pwr_led, and the required "input"
- trigger
-
-The "input" trigger makes the associated GPIO an input. This is to support
-the Raspberry Pi PWR LED, which is driven by external hardware in normal use.
-
-N.B. pwr_led is not available on Model A or B boards.
-
-leds-gpio: Implement the brightness_get method
-
-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
----
- drivers/leds/leds-gpio.c | 17 ++++++++-
- drivers/leds/trigger/Kconfig | 7 ++++
- drivers/leds/trigger/Makefile | 1 +
- drivers/leds/trigger/ledtrig-input.c | 55 ++++++++++++++++++++++++++++
- include/linux/leds.h | 3 ++
- 5 files changed, 82 insertions(+), 1 deletion(-)
- create mode 100644 drivers/leds/trigger/ledtrig-input.c
-
---- a/drivers/leds/leds-gpio.c
-+++ b/drivers/leds/leds-gpio.c
-@@ -50,8 +50,15 @@ static void gpio_led_set(struct led_clas
- led_dat->platform_gpio_blink_set(led_dat->gpiod, level,
- NULL, NULL);
- led_dat->blinking = 0;
-+ } else if (led_dat->cdev.flags & SET_GPIO_INPUT) {
-+ gpiod_direction_input(led_dat->gpiod);
-+ led_dat->cdev.flags &= ~SET_GPIO_INPUT;
-+ } else if (led_dat->cdev.flags & SET_GPIO_OUTPUT) {
-+ gpiod_direction_output(led_dat->gpiod, level);
-+ led_dat->cdev.flags &= ~SET_GPIO_OUTPUT;
- } else {
-- if (led_dat->can_sleep)
-+ if (led_dat->can_sleep ||
-+ (led_dat->cdev.flags & (SET_GPIO_INPUT | SET_GPIO_OUTPUT) ))
- gpiod_set_value_cansleep(led_dat->gpiod, level);
- else
- gpiod_set_value(led_dat->gpiod, level);
-@@ -65,6 +72,13 @@ static int gpio_led_set_blocking(struct
- return 0;
- }
-
-+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)
- {
-@@ -122,6 +136,7 @@ static int create_gpio_led(const struct
- led_dat->platform_gpio_blink_set = blink_set;
- led_dat->cdev.blink_set = gpio_blink_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);
- if (state < 0)
---- a/drivers/leds/trigger/Kconfig
-+++ b/drivers/leds/trigger/Kconfig
-@@ -113,6 +113,13 @@ config LEDS_TRIGGER_CAMERA
- This enables direct flash/torch on/off by the driver, kernel space.
- If unsure, say Y.
-
-+config LEDS_TRIGGER_INPUT
-+ tristate "LED Input Trigger"
-+ depends on LEDS_TRIGGERS
-+ help
-+ This allows the GPIOs assigned to be LEDs to be initialised to inputs.
-+ If unsure, say Y.
-+
- config LEDS_TRIGGER_PANIC
- bool "LED Panic Trigger"
- help
---- a/drivers/leds/trigger/Makefile
-+++ b/drivers/leds/trigger/Makefile
-@@ -11,5 +11,6 @@ obj-$(CONFIG_LEDS_TRIGGER_ACTIVITY) += l
- obj-$(CONFIG_LEDS_TRIGGER_DEFAULT_ON) += ledtrig-default-on.o
- obj-$(CONFIG_LEDS_TRIGGER_TRANSIENT) += ledtrig-transient.o
- obj-$(CONFIG_LEDS_TRIGGER_CAMERA) += ledtrig-camera.o
-+obj-$(CONFIG_LEDS_TRIGGER_INPUT) += ledtrig-input.o
- obj-$(CONFIG_LEDS_TRIGGER_PANIC) += ledtrig-panic.o
- obj-$(CONFIG_LEDS_TRIGGER_NETDEV) += ledtrig-netdev.o
---- /dev/null
-+++ b/drivers/leds/trigger/ledtrig-input.c
-@@ -0,0 +1,55 @@
-+/*
-+ * Set LED GPIO to Input "Trigger"
-+ *
-+ * Copyright 2015 Phil Elwell <phil@raspberrypi.org>
-+ *
-+ * Based on Nick Forbes's ledtrig-default-on.c.
-+ *
-+ * This program is free software; you can redistribute it and/or modify
-+ * it under the terms of the GNU General Public License version 2 as
-+ * published by the Free Software Foundation.
-+ *
-+ */
-+
-+#include <linux/module.h>
-+#include <linux/kernel.h>
-+#include <linux/init.h>
-+#include <linux/leds.h>
-+#include <linux/gpio.h>
-+#include "../leds.h"
-+
-+static int input_trig_activate(struct led_classdev *led_cdev)
-+{
-+ led_cdev->flags |= SET_GPIO_INPUT;
-+ led_set_brightness(led_cdev, 0);
-+ return 0;
-+}
-+
-+static void input_trig_deactivate(struct led_classdev *led_cdev)
-+{
-+ led_cdev->flags |= SET_GPIO_OUTPUT;
-+ led_set_brightness(led_cdev, 0);
-+}
-+
-+static struct led_trigger input_led_trigger = {
-+ .name = "input",
-+ .activate = input_trig_activate,
-+ .deactivate = input_trig_deactivate,
-+};
-+
-+static int __init input_trig_init(void)
-+{
-+ return led_trigger_register(&input_led_trigger);
-+}
-+
-+static void __exit input_trig_exit(void)
-+{
-+ led_trigger_unregister(&input_led_trigger);
-+}
-+
-+module_init(input_trig_init);
-+module_exit(input_trig_exit);
-+
-+MODULE_AUTHOR("Phil Elwell <phil@raspberrypi.org>");
-+MODULE_DESCRIPTION("Set LED GPIO to Input \"trigger\"");
-+MODULE_LICENSE("GPL");
---- a/include/linux/leds.h
-+++ b/include/linux/leds.h
-@@ -50,6 +50,9 @@ struct led_classdev {
- #define LED_PANIC_INDICATOR BIT(20)
- #define LED_BRIGHT_HW_CHANGED BIT(21)
- #define LED_RETAIN_AT_SHUTDOWN BIT(22)
-+ /* Additions for Raspberry Pi PWR LED */
-+#define SET_GPIO_INPUT BIT(30)
-+#define SET_GPIO_OUTPUT BIT(31)
-
- /* set_brightness_work / blink_timer flags, atomic, private. */
- unsigned long work_flags;
projects / openwrt / staging / dedeckeh.git / blobdiff