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
14#include <linux/module.h>
15#include <linux/kernel.h>
16#include <linux/init.h>
17#include <linux/device.h>
18#include <linux/ctype.h>
19#include <linux/leds.h>
20#include "leds.h"
21
22static ssize_t led_delay_on_show(struct device *dev,
23 struct device_attribute *attr, char *buf)
24{
25 struct led_classdev *led_cdev = dev_get_drvdata(dev);
26
27 return sprintf(buf, "%lu\n", led_cdev->blink_delay_on);
28}
29
30static ssize_t led_delay_on_store(struct device *dev,
31 struct device_attribute *attr, const char *buf, size_t size)
32{
33 struct led_classdev *led_cdev = dev_get_drvdata(dev);
34 unsigned long state;
35 ssize_t ret = -EINVAL;
36
37 ret = kstrtoul(buf, 10, &state);
38 if (ret)
39 return ret;
40
41 led_blink_set(led_cdev, &state, &led_cdev->blink_delay_off);
42 led_cdev->blink_delay_on = state;
43
44 return size;
45}
46
47static ssize_t led_delay_off_show(struct device *dev,
48 struct device_attribute *attr, char *buf)
49{
50 struct led_classdev *led_cdev = dev_get_drvdata(dev);
51
52 return sprintf(buf, "%lu\n", led_cdev->blink_delay_off);
53}
54
55static ssize_t led_delay_off_store(struct device *dev,
56 struct device_attribute *attr, const char *buf, size_t size)
57{
58 struct led_classdev *led_cdev = dev_get_drvdata(dev);
59 unsigned long state;
60 ssize_t ret = -EINVAL;
61
62 ret = kstrtoul(buf, 10, &state);
63 if (ret)
64 return ret;
65
66 led_blink_set(led_cdev, &led_cdev->blink_delay_on, &state);
67 led_cdev->blink_delay_off = state;
68
69 return size;
70}
71
72static DEVICE_ATTR(delay_on, 0644, led_delay_on_show, led_delay_on_store);
73static DEVICE_ATTR(delay_off, 0644, led_delay_off_show, led_delay_off_store);
74
75static void timer_trig_activate(struct led_classdev *led_cdev)
76{
77 int rc;
78
79 led_cdev->trigger_data = NULL;
80
81 rc = device_create_file(led_cdev->dev, &dev_attr_delay_on);
82 if (rc)
83 return;
84 rc = device_create_file(led_cdev->dev, &dev_attr_delay_off);
85 if (rc)
86 goto err_out_delayon;
87
88 led_blink_set(led_cdev, &led_cdev->blink_delay_on,
89 &led_cdev->blink_delay_off);
90 led_cdev->activated = true;
91
92 return;
93
94err_out_delayon:
95 device_remove_file(led_cdev->dev, &dev_attr_delay_on);
96}
97
98static void timer_trig_deactivate(struct led_classdev *led_cdev)
99{
100 if (led_cdev->activated) {
101 device_remove_file(led_cdev->dev, &dev_attr_delay_on);
102 device_remove_file(led_cdev->dev, &dev_attr_delay_off);
103 led_cdev->activated = false;
104 }
105
106 /* Stop blinking */
107 led_set_brightness(led_cdev, LED_OFF);
108}
109
110static struct led_trigger timer_led_trigger = {
111 .name = "timer",
112 .activate = timer_trig_activate,
113 .deactivate = timer_trig_deactivate,
114};
115
116static int __init timer_trig_init(void)
117{
118 return led_trigger_register(&timer_led_trigger);
119}
120
121static void __exit timer_trig_exit(void)
122{
123 led_trigger_unregister(&timer_led_trigger);
124}
125
126module_init(timer_trig_init);
127module_exit(timer_trig_exit);
128
129MODULE_AUTHOR("Richard Purdie <rpurdie@openedhand.com>");
130MODULE_DESCRIPTION("Timer LED trigger");
131MODULE_LICENSE("GPL");