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6655c6fe RP |
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/config.h> | |
15 | #include <linux/module.h> | |
16 | #include <linux/kernel.h> | |
17 | #include <linux/init.h> | |
18 | #include <linux/list.h> | |
19 | #include <linux/spinlock.h> | |
20 | #include <linux/device.h> | |
21 | #include <linux/sysdev.h> | |
22 | #include <linux/timer.h> | |
23 | #include <linux/leds.h> | |
24 | #include "leds.h" | |
25 | ||
26 | struct timer_trig_data { | |
27 | unsigned long delay_on; /* milliseconds on */ | |
28 | unsigned long delay_off; /* milliseconds off */ | |
29 | struct timer_list timer; | |
30 | }; | |
31 | ||
32 | static void led_timer_function(unsigned long data) | |
33 | { | |
34 | struct led_classdev *led_cdev = (struct led_classdev *) data; | |
35 | struct timer_trig_data *timer_data = led_cdev->trigger_data; | |
36 | unsigned long brightness = LED_OFF; | |
37 | unsigned long delay = timer_data->delay_off; | |
38 | ||
39 | if (!timer_data->delay_on || !timer_data->delay_off) { | |
40 | led_set_brightness(led_cdev, LED_OFF); | |
41 | return; | |
42 | } | |
43 | ||
44 | if (!led_cdev->brightness) { | |
45 | brightness = LED_FULL; | |
46 | delay = timer_data->delay_on; | |
47 | } | |
48 | ||
49 | led_set_brightness(led_cdev, brightness); | |
50 | ||
51 | mod_timer(&timer_data->timer, jiffies + msecs_to_jiffies(delay)); | |
52 | } | |
53 | ||
54 | static ssize_t led_delay_on_show(struct class_device *dev, char *buf) | |
55 | { | |
56 | struct led_classdev *led_cdev = class_get_devdata(dev); | |
57 | struct timer_trig_data *timer_data = led_cdev->trigger_data; | |
58 | ||
59 | sprintf(buf, "%lu\n", timer_data->delay_on); | |
60 | ||
61 | return strlen(buf) + 1; | |
62 | } | |
63 | ||
64 | static ssize_t led_delay_on_store(struct class_device *dev, const char *buf, | |
65 | size_t size) | |
66 | { | |
67 | struct led_classdev *led_cdev = class_get_devdata(dev); | |
68 | struct timer_trig_data *timer_data = led_cdev->trigger_data; | |
69 | int ret = -EINVAL; | |
70 | char *after; | |
71 | unsigned long state = simple_strtoul(buf, &after, 10); | |
72 | ||
73 | if (after - buf > 0) { | |
74 | timer_data->delay_on = state; | |
75 | mod_timer(&timer_data->timer, jiffies + 1); | |
76 | ret = after - buf; | |
77 | } | |
78 | ||
79 | return ret; | |
80 | } | |
81 | ||
82 | static ssize_t led_delay_off_show(struct class_device *dev, char *buf) | |
83 | { | |
84 | struct led_classdev *led_cdev = class_get_devdata(dev); | |
85 | struct timer_trig_data *timer_data = led_cdev->trigger_data; | |
86 | ||
87 | sprintf(buf, "%lu\n", timer_data->delay_off); | |
88 | ||
89 | return strlen(buf) + 1; | |
90 | } | |
91 | ||
92 | static ssize_t led_delay_off_store(struct class_device *dev, const char *buf, | |
93 | size_t size) | |
94 | { | |
95 | struct led_classdev *led_cdev = class_get_devdata(dev); | |
96 | struct timer_trig_data *timer_data = led_cdev->trigger_data; | |
97 | int ret = -EINVAL; | |
98 | char *after; | |
99 | unsigned long state = simple_strtoul(buf, &after, 10); | |
100 | ||
101 | if (after - buf > 0) { | |
102 | timer_data->delay_off = state; | |
103 | mod_timer(&timer_data->timer, jiffies + 1); | |
104 | ret = after - buf; | |
105 | } | |
106 | ||
107 | return ret; | |
108 | } | |
109 | ||
110 | static CLASS_DEVICE_ATTR(delay_on, 0644, led_delay_on_show, | |
111 | led_delay_on_store); | |
112 | static CLASS_DEVICE_ATTR(delay_off, 0644, led_delay_off_show, | |
113 | led_delay_off_store); | |
114 | ||
115 | static void timer_trig_activate(struct led_classdev *led_cdev) | |
116 | { | |
117 | struct timer_trig_data *timer_data; | |
118 | ||
119 | timer_data = kzalloc(sizeof(struct timer_trig_data), GFP_KERNEL); | |
120 | if (!timer_data) | |
121 | return; | |
122 | ||
123 | led_cdev->trigger_data = timer_data; | |
124 | ||
125 | init_timer(&timer_data->timer); | |
126 | timer_data->timer.function = led_timer_function; | |
127 | timer_data->timer.data = (unsigned long) led_cdev; | |
128 | ||
129 | class_device_create_file(led_cdev->class_dev, | |
130 | &class_device_attr_delay_on); | |
131 | class_device_create_file(led_cdev->class_dev, | |
132 | &class_device_attr_delay_off); | |
133 | } | |
134 | ||
135 | static void timer_trig_deactivate(struct led_classdev *led_cdev) | |
136 | { | |
137 | struct timer_trig_data *timer_data = led_cdev->trigger_data; | |
138 | ||
139 | if (timer_data) { | |
140 | class_device_remove_file(led_cdev->class_dev, | |
141 | &class_device_attr_delay_on); | |
142 | class_device_remove_file(led_cdev->class_dev, | |
143 | &class_device_attr_delay_off); | |
144 | del_timer_sync(&timer_data->timer); | |
145 | kfree(timer_data); | |
146 | } | |
147 | } | |
148 | ||
149 | static struct led_trigger timer_led_trigger = { | |
150 | .name = "timer", | |
151 | .activate = timer_trig_activate, | |
152 | .deactivate = timer_trig_deactivate, | |
153 | }; | |
154 | ||
155 | static int __init timer_trig_init(void) | |
156 | { | |
157 | return led_trigger_register(&timer_led_trigger); | |
158 | } | |
159 | ||
160 | static void __exit timer_trig_exit(void) | |
161 | { | |
162 | led_trigger_unregister(&timer_led_trigger); | |
163 | } | |
164 | ||
165 | module_init(timer_trig_init); | |
166 | module_exit(timer_trig_exit); | |
167 | ||
168 | MODULE_AUTHOR("Richard Purdie <rpurdie@openedhand.com>"); | |
169 | MODULE_DESCRIPTION("Timer LED trigger"); | |
170 | MODULE_LICENSE("GPL"); |