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7d7aa2fd92
This change makes the names of Broadcom targets consistent by using the common notation based on SoC/CPU ID (which is used internally anyway), bcmXXXX instead of brcmXXXX. This is even used for target TITLE in make menuconfig already, only the short target name used brcm so far. Despite, since subtargets range from bcm2708 to bcm2711, it seems appropriate to use bcm27xx instead of bcm2708 (again, as already done for BOARDNAME). This also renames the packages brcm2708-userland and brcm2708-gpu-fw. Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de> Acked-by: Álvaro Fernández Rojas <noltari@gmail.com>
169 lines
5.5 KiB
Diff
169 lines
5.5 KiB
Diff
From 7181db1685aa67e127f80fe9607270d3c87aa3b9 Mon Sep 17 00:00:00 2001
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From: Phil Elwell <phil@raspberrypi.org>
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Date: Fri, 6 Feb 2015 13:50:57 +0000
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Subject: [PATCH] BCM270x_DT: Add pwr_led, and the required "input"
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trigger
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The "input" trigger makes the associated GPIO an input. This is to support
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the Raspberry Pi PWR LED, which is driven by external hardware in normal use.
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N.B. pwr_led is not available on Model A or B boards.
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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
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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 | 17 ++++++++-
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drivers/leds/trigger/Kconfig | 7 ++++
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drivers/leds/trigger/Makefile | 1 +
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drivers/leds/trigger/ledtrig-input.c | 55 ++++++++++++++++++++++++++++
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include/linux/leds.h | 3 ++
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5 files changed, 82 insertions(+), 1 deletion(-)
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create mode 100644 drivers/leds/trigger/ledtrig-input.c
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--- a/drivers/leds/leds-gpio.c
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+++ b/drivers/leds/leds-gpio.c
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@@ -50,8 +50,15 @@ static void gpio_led_set(struct led_clas
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led_dat->platform_gpio_blink_set(led_dat->gpiod, level,
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NULL, NULL);
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led_dat->blinking = 0;
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+ } else if (led_dat->cdev.flags & SET_GPIO_INPUT) {
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+ gpiod_direction_input(led_dat->gpiod);
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+ led_dat->cdev.flags &= ~SET_GPIO_INPUT;
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+ } else if (led_dat->cdev.flags & SET_GPIO_OUTPUT) {
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+ gpiod_direction_output(led_dat->gpiod, level);
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+ led_dat->cdev.flags &= ~SET_GPIO_OUTPUT;
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} else {
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- if (led_dat->can_sleep)
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+ if (led_dat->can_sleep ||
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+ (led_dat->cdev.flags & (SET_GPIO_INPUT | SET_GPIO_OUTPUT) ))
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gpiod_set_value_cansleep(led_dat->gpiod, level);
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else
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gpiod_set_value(led_dat->gpiod, level);
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@@ -65,6 +72,13 @@ static int gpio_led_set_blocking(struct
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return 0;
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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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@@ -122,6 +136,7 @@ static int create_gpio_led(const struct
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led_dat->platform_gpio_blink_set = blink_set;
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led_dat->cdev.blink_set = gpio_blink_set;
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}
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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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if (state < 0)
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--- a/drivers/leds/trigger/Kconfig
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+++ b/drivers/leds/trigger/Kconfig
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@@ -113,6 +113,13 @@ config LEDS_TRIGGER_CAMERA
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This enables direct flash/torch on/off by the driver, kernel space.
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If unsure, say Y.
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+config LEDS_TRIGGER_INPUT
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+ tristate "LED Input Trigger"
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+ depends on LEDS_TRIGGERS
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+ help
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+ This allows the GPIOs assigned to be LEDs to be initialised to inputs.
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+ If unsure, say Y.
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+
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config LEDS_TRIGGER_PANIC
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bool "LED Panic Trigger"
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help
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--- a/drivers/leds/trigger/Makefile
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+++ b/drivers/leds/trigger/Makefile
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@@ -11,5 +11,6 @@ obj-$(CONFIG_LEDS_TRIGGER_ACTIVITY) += l
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obj-$(CONFIG_LEDS_TRIGGER_DEFAULT_ON) += ledtrig-default-on.o
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obj-$(CONFIG_LEDS_TRIGGER_TRANSIENT) += ledtrig-transient.o
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obj-$(CONFIG_LEDS_TRIGGER_CAMERA) += ledtrig-camera.o
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+obj-$(CONFIG_LEDS_TRIGGER_INPUT) += ledtrig-input.o
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obj-$(CONFIG_LEDS_TRIGGER_PANIC) += ledtrig-panic.o
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obj-$(CONFIG_LEDS_TRIGGER_NETDEV) += ledtrig-netdev.o
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--- /dev/null
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+++ b/drivers/leds/trigger/ledtrig-input.c
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@@ -0,0 +1,55 @@
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+/*
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+ * Set LED GPIO to Input "Trigger"
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+ *
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+ * Copyright 2015 Phil Elwell <phil@raspberrypi.org>
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+ *
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+ * Based on Nick Forbes's ledtrig-default-on.c.
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+ *
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+ * This program is free software; you can redistribute it and/or modify
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+ * it under the terms of the GNU General Public License version 2 as
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+ * published by the Free Software Foundation.
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+ *
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+ */
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+
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+#include <linux/module.h>
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+#include <linux/kernel.h>
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+#include <linux/init.h>
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+#include <linux/leds.h>
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+#include <linux/gpio.h>
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+#include "../leds.h"
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+
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+static int input_trig_activate(struct led_classdev *led_cdev)
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+{
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+ led_cdev->flags |= SET_GPIO_INPUT;
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+ led_set_brightness(led_cdev, 0);
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+ return 0;
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+}
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+
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+static void input_trig_deactivate(struct led_classdev *led_cdev)
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+{
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+ led_cdev->flags |= SET_GPIO_OUTPUT;
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+ led_set_brightness(led_cdev, 0);
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+}
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+
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+static struct led_trigger input_led_trigger = {
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+ .name = "input",
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+ .activate = input_trig_activate,
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+ .deactivate = input_trig_deactivate,
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+};
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+
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+static int __init input_trig_init(void)
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+{
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+ return led_trigger_register(&input_led_trigger);
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+}
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+
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+static void __exit input_trig_exit(void)
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+{
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+ led_trigger_unregister(&input_led_trigger);
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+}
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+
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+module_init(input_trig_init);
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+module_exit(input_trig_exit);
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+
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+MODULE_AUTHOR("Phil Elwell <phil@raspberrypi.org>");
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+MODULE_DESCRIPTION("Set LED GPIO to Input \"trigger\"");
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+MODULE_LICENSE("GPL");
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--- a/include/linux/leds.h
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+++ b/include/linux/leds.h
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@@ -50,6 +50,9 @@ struct led_classdev {
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#define LED_PANIC_INDICATOR BIT(20)
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#define LED_BRIGHT_HW_CHANGED BIT(21)
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#define LED_RETAIN_AT_SHUTDOWN BIT(22)
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+ /* Additions for Raspberry Pi PWR LED */
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+#define SET_GPIO_INPUT BIT(30)
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+#define SET_GPIO_OUTPUT BIT(31)
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/* set_brightness_work / blink_timer flags, atomic, private. */
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unsigned long work_flags;
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