Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1/*
2 * LED Kernel Timer Trigger
3 *
4 * Copyright 2005-2006 Openedhand Ltd.
5 *
6 * Author: Richard Purdie <rpurdie@openedhand.com>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 */
12
13#include <linux/module.h>
14#include <linux/kernel.h>
15#include <linux/init.h>
16#include <linux/device.h>
17#include <linux/ctype.h>
18#include <linux/slab.h>
19#include <linux/leds.h>
20
21static ssize_t led_delay_on_show(struct device *dev,
22 struct device_attribute *attr, char *buf)
23{
24 struct led_classdev *led_cdev = led_trigger_get_led(dev);
25
26 return sprintf(buf, "%lu\n", led_cdev->blink_delay_on);
27}
28
29static ssize_t led_delay_on_store(struct device *dev,
30 struct device_attribute *attr, const char *buf, size_t size)
31{
32 struct led_classdev *led_cdev = led_trigger_get_led(dev);
33 unsigned long state;
34 ssize_t ret = -EINVAL;
35
36 ret = kstrtoul(buf, 10, &state);
37 if (ret)
38 return ret;
39
40 led_blink_set(led_cdev, &state, &led_cdev->blink_delay_off);
41 led_cdev->blink_delay_on = state;
42
43 return size;
44}
45
46static ssize_t led_delay_off_show(struct device *dev,
47 struct device_attribute *attr, char *buf)
48{
49 struct led_classdev *led_cdev = led_trigger_get_led(dev);
50
51 return sprintf(buf, "%lu\n", led_cdev->blink_delay_off);
52}
53
54static ssize_t led_delay_off_store(struct device *dev,
55 struct device_attribute *attr, const char *buf, size_t size)
56{
57 struct led_classdev *led_cdev = led_trigger_get_led(dev);
58 unsigned long state;
59 ssize_t ret = -EINVAL;
60
61 ret = kstrtoul(buf, 10, &state);
62 if (ret)
63 return ret;
64
65 led_blink_set(led_cdev, &led_cdev->blink_delay_on, &state);
66 led_cdev->blink_delay_off = state;
67
68 return size;
69}
70
71static DEVICE_ATTR(delay_on, 0644, led_delay_on_show, led_delay_on_store);
72static DEVICE_ATTR(delay_off, 0644, led_delay_off_show, led_delay_off_store);
73
74static struct attribute *timer_trig_attrs[] = {
75 &dev_attr_delay_on.attr,
76 &dev_attr_delay_off.attr,
77 NULL
78};
79ATTRIBUTE_GROUPS(timer_trig);
80
81static void pattern_init(struct led_classdev *led_cdev)
82{
83 u32 *pattern;
84 unsigned int size = 0;
85
86 pattern = led_get_default_pattern(led_cdev, &size);
87 if (!pattern)
88 return;
89
90 if (size != 2) {
91 dev_warn(led_cdev->dev,
92 "Expected 2 but got %u values for delays pattern\n",
93 size);
94 goto out;
95 }
96
97 led_cdev->blink_delay_on = pattern[0];
98 led_cdev->blink_delay_off = pattern[1];
99 /* led_blink_set() called by caller */
100
101out:
102 kfree(pattern);
103}
104
105static int timer_trig_activate(struct led_classdev *led_cdev)
106{
107 if (led_cdev->flags & LED_INIT_DEFAULT_TRIGGER) {
108 pattern_init(led_cdev);
109 /*
110 * Mark as initialized even on pattern_init() error because
111 * any consecutive call to it would produce the same error.
112 */
113 led_cdev->flags &= ~LED_INIT_DEFAULT_TRIGGER;
114 }
115
116 led_blink_set(led_cdev, &led_cdev->blink_delay_on,
117 &led_cdev->blink_delay_off);
118
119 return 0;
120}
121
122static void timer_trig_deactivate(struct led_classdev *led_cdev)
123{
124 /* Stop blinking */
125 led_set_brightness(led_cdev, LED_OFF);
126}
127
128static struct led_trigger timer_led_trigger = {
129 .name = "timer",
130 .activate = timer_trig_activate,
131 .deactivate = timer_trig_deactivate,
132 .groups = timer_trig_groups,
133};
134module_led_trigger(timer_led_trigger);
135
136MODULE_AUTHOR("Richard Purdie <rpurdie@openedhand.com>");
137MODULE_DESCRIPTION("Timer LED trigger");
138MODULE_LICENSE("GPL v2");