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 int ret = -EINVAL;
35 char *after;
36 unsigned long state = simple_strtoul(buf, &after, 10);
37 size_t count = after - buf;
38
39 if (isspace(*after))
40 count++;
41
42 if (count == size) {
43 led_blink_set(led_cdev, &state, &led_cdev->blink_delay_off);
44 led_cdev->blink_delay_on = state;
45 ret = count;
46 }
47
48 return ret;
49}
50
51static ssize_t led_delay_off_show(struct device *dev,
52 struct device_attribute *attr, char *buf)
53{
54 struct led_classdev *led_cdev = dev_get_drvdata(dev);
55
56 return sprintf(buf, "%lu\n", led_cdev->blink_delay_off);
57}
58
59static ssize_t led_delay_off_store(struct device *dev,
60 struct device_attribute *attr, const char *buf, size_t size)
61{
62 struct led_classdev *led_cdev = dev_get_drvdata(dev);
63 int ret = -EINVAL;
64 char *after;
65 unsigned long state = simple_strtoul(buf, &after, 10);
66 size_t count = after - buf;
67
68 if (isspace(*after))
69 count++;
70
71 if (count == size) {
72 led_blink_set(led_cdev, &led_cdev->blink_delay_on, &state);
73 led_cdev->blink_delay_off = state;
74 ret = count;
75 }
76
77 return ret;
78}
79
80static DEVICE_ATTR(delay_on, 0644, led_delay_on_show, led_delay_on_store);
81static DEVICE_ATTR(delay_off, 0644, led_delay_off_show, led_delay_off_store);
82
83static void timer_trig_activate(struct led_classdev *led_cdev)
84{
85 int rc;
86
87 led_cdev->trigger_data = NULL;
88
89 rc = device_create_file(led_cdev->dev, &dev_attr_delay_on);
90 if (rc)
91 return;
92 rc = device_create_file(led_cdev->dev, &dev_attr_delay_off);
93 if (rc)
94 goto err_out_delayon;
95
96 led_blink_set(led_cdev, &led_cdev->blink_delay_on,
97 &led_cdev->blink_delay_off);
98
99 led_cdev->trigger_data = (void *)1;
100
101 return;
102
103err_out_delayon:
104 device_remove_file(led_cdev->dev, &dev_attr_delay_on);
105}
106
107static void timer_trig_deactivate(struct led_classdev *led_cdev)
108{
109 if (led_cdev->trigger_data) {
110 device_remove_file(led_cdev->dev, &dev_attr_delay_on);
111 device_remove_file(led_cdev->dev, &dev_attr_delay_off);
112 }
113
114 /* Stop blinking */
115 led_brightness_set(led_cdev, LED_OFF);
116}
117
118static struct led_trigger timer_led_trigger = {
119 .name = "timer",
120 .activate = timer_trig_activate,
121 .deactivate = timer_trig_deactivate,
122};
123
124static int __init timer_trig_init(void)
125{
126 return led_trigger_register(&timer_led_trigger);
127}
128
129static void __exit timer_trig_exit(void)
130{
131 led_trigger_unregister(&timer_led_trigger);
132}
133
134module_init(timer_trig_init);
135module_exit(timer_trig_exit);
136
137MODULE_AUTHOR("Richard Purdie <rpurdie@openedhand.com>");
138MODULE_DESCRIPTION("Timer LED trigger");
139MODULE_LICENSE("GPL");