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107 lines
3.2 KiB
Diff
107 lines
3.2 KiB
Diff
From 1578dbee8e10fed1be0f64820fe511dc4b7a720e 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 053/121] 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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---
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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 | 65 ++++++++++++++++++++++++++++++++++++
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3 files changed, 73 insertions(+)
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create mode 100644 drivers/leds/trigger/ledtrig-input.c
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--- a/drivers/leds/trigger/Kconfig
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+++ b/drivers/leds/trigger/Kconfig
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@@ -126,4 +126,11 @@ config LEDS_TRIGGER_USBDEV
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This allows LEDs to be controlled by the presence/activity of
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an USB device. If unsure, say N.
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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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endif # LEDS_TRIGGERS
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--- a/drivers/leds/trigger/Makefile
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+++ b/drivers/leds/trigger/Makefile
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@@ -8,3 +8,4 @@ obj-$(CONFIG_LEDS_TRIGGER_CPU) += ledtr
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obj-$(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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--- /dev/null
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+++ b/drivers/leds/trigger/ledtrig-input.c
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@@ -0,0 +1,65 @@
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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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+/* This is a hack to get at the private 'gpio' member */
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+
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+struct gpio_led_data {
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+ struct led_classdev cdev;
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+ unsigned gpio;
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+};
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+
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+static void input_trig_activate(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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+ if (gpio_is_valid(led_dat->gpio))
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+ gpio_direction_input(led_dat->gpio);
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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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+ struct gpio_led_data *led_dat =
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+ container_of(led_cdev, struct gpio_led_data, cdev);
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+ if (gpio_is_valid(led_dat->gpio))
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+ gpio_direction_output(led_dat->gpio, 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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