1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
|
From a2b52a3af1314e2b691d9518afb3051193758671 Mon Sep 17 00:00:00 2001
From: Phil Elwell <phil@raspberrypi.org>
Date: Fri, 6 Feb 2015 13:50:57 +0000
Subject: [PATCH 074/170] 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 | 18 +++++++++++-
drivers/leds/trigger/Kconfig | 7 +++++
drivers/leds/trigger/Makefile | 1 +
drivers/leds/trigger/ledtrig-input.c | 54 ++++++++++++++++++++++++++++++++++++
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
@@ -42,6 +42,13 @@ static void gpio_led_work(struct work_st
led_dat->platform_gpio_blink_set(led_dat->gpiod,
led_dat->new_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, led_dat->new_level);
+ led_dat->cdev.flags &= ~SET_GPIO_OUTPUT;
} else
gpiod_set_value_cansleep(led_dat->gpiod, led_dat->new_level);
}
@@ -62,7 +69,8 @@ static void gpio_led_set(struct led_clas
* seem to have a reliable way to know if we're already in one; so
* let's just assume the worst.
*/
- if (led_dat->can_sleep) {
+ if (led_dat->can_sleep ||
+ (led_dat->cdev.flags & (SET_GPIO_INPUT | SET_GPIO_OUTPUT) )) {
led_dat->new_level = level;
schedule_work(&led_dat->work);
} else {
@@ -75,6 +83,13 @@ static void gpio_led_set(struct led_clas
}
}
+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)
{
@@ -131,6 +146,7 @@ static int create_gpio_led(const struct
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
--- a/drivers/leds/trigger/Kconfig
+++ b/drivers/leds/trigger/Kconfig
@@ -126,4 +126,11 @@ config LEDS_TRIGGER_USBDEV
This allows LEDs to be controlled by the presence/activity of
an USB device. If unsure, say N.
+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.
+
endif # LEDS_TRIGGERS
--- a/drivers/leds/trigger/Makefile
+++ b/drivers/leds/trigger/Makefile
@@ -8,3 +8,4 @@ obj-$(CONFIG_LEDS_TRIGGER_CPU) += ledtr
obj-$(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
--- /dev/null
+++ b/drivers/leds/trigger/ledtrig-input.c
@@ -0,0 +1,54 @@
+/*
+ * 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 void input_trig_activate(struct led_classdev *led_cdev)
+{
+ led_cdev->flags |= SET_GPIO_INPUT;
+ led_set_brightness_async(led_cdev, 0);
+}
+
+static void input_trig_deactivate(struct led_classdev *led_cdev)
+{
+ led_cdev->flags |= SET_GPIO_OUTPUT;
+ led_set_brightness_async(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
@@ -48,6 +48,9 @@ struct led_classdev {
#define SET_BRIGHTNESS_ASYNC (1 << 21)
#define SET_BRIGHTNESS_SYNC (1 << 22)
#define LED_DEV_CAP_FLASH (1 << 23)
+ /* Additions for Raspberry Pi PWR LED */
+#define SET_GPIO_INPUT (1 << 30)
+#define SET_GPIO_OUTPUT (1 << 31)
/* Set LED brightness level */
/* Must not sleep, use a workqueue if needed */
|
