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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 | ||
6655c6fe | 14 | #include <linux/module.h> |
f6a57033 | 15 | #include <linux/jiffies.h> |
6655c6fe RP |
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> | |
3dc7b82e | 23 | #include <linux/ctype.h> |
6655c6fe RP |
24 | #include <linux/leds.h> |
25 | #include "leds.h" | |
26 | ||
27 | struct timer_trig_data { | |
28 | unsigned long delay_on; /* milliseconds on */ | |
29 | unsigned long delay_off; /* milliseconds off */ | |
30 | struct timer_list timer; | |
31 | }; | |
32 | ||
33 | static void led_timer_function(unsigned long data) | |
34 | { | |
35 | struct led_classdev *led_cdev = (struct led_classdev *) data; | |
36 | struct timer_trig_data *timer_data = led_cdev->trigger_data; | |
37 | unsigned long brightness = LED_OFF; | |
38 | unsigned long delay = timer_data->delay_off; | |
39 | ||
40 | if (!timer_data->delay_on || !timer_data->delay_off) { | |
41 | led_set_brightness(led_cdev, LED_OFF); | |
42 | return; | |
43 | } | |
44 | ||
45 | if (!led_cdev->brightness) { | |
46 | brightness = LED_FULL; | |
47 | delay = timer_data->delay_on; | |
48 | } | |
49 | ||
50 | led_set_brightness(led_cdev, brightness); | |
51 | ||
52 | mod_timer(&timer_data->timer, jiffies + msecs_to_jiffies(delay)); | |
53 | } | |
54 | ||
55 | static ssize_t led_delay_on_show(struct class_device *dev, char *buf) | |
56 | { | |
57 | struct led_classdev *led_cdev = class_get_devdata(dev); | |
58 | struct timer_trig_data *timer_data = led_cdev->trigger_data; | |
59 | ||
60 | sprintf(buf, "%lu\n", timer_data->delay_on); | |
61 | ||
62 | return strlen(buf) + 1; | |
63 | } | |
64 | ||
65 | static ssize_t led_delay_on_store(struct class_device *dev, const char *buf, | |
66 | size_t size) | |
67 | { | |
68 | struct led_classdev *led_cdev = class_get_devdata(dev); | |
69 | struct timer_trig_data *timer_data = led_cdev->trigger_data; | |
70 | int ret = -EINVAL; | |
71 | char *after; | |
72 | unsigned long state = simple_strtoul(buf, &after, 10); | |
3dc7b82e | 73 | size_t count = after - buf; |
6655c6fe | 74 | |
3dc7b82e RP |
75 | if (*after && isspace(*after)) |
76 | count++; | |
77 | ||
78 | if (count == size) { | |
6655c6fe RP |
79 | timer_data->delay_on = state; |
80 | mod_timer(&timer_data->timer, jiffies + 1); | |
3dc7b82e | 81 | ret = count; |
6655c6fe RP |
82 | } |
83 | ||
84 | return ret; | |
85 | } | |
86 | ||
87 | static ssize_t led_delay_off_show(struct class_device *dev, char *buf) | |
88 | { | |
89 | struct led_classdev *led_cdev = class_get_devdata(dev); | |
90 | struct timer_trig_data *timer_data = led_cdev->trigger_data; | |
91 | ||
92 | sprintf(buf, "%lu\n", timer_data->delay_off); | |
93 | ||
94 | return strlen(buf) + 1; | |
95 | } | |
96 | ||
97 | static ssize_t led_delay_off_store(struct class_device *dev, const char *buf, | |
98 | size_t size) | |
99 | { | |
100 | struct led_classdev *led_cdev = class_get_devdata(dev); | |
101 | struct timer_trig_data *timer_data = led_cdev->trigger_data; | |
102 | int ret = -EINVAL; | |
103 | char *after; | |
104 | unsigned long state = simple_strtoul(buf, &after, 10); | |
3dc7b82e RP |
105 | size_t count = after - buf; |
106 | ||
107 | if (*after && isspace(*after)) | |
108 | count++; | |
6655c6fe | 109 | |
3dc7b82e | 110 | if (count == size) { |
6655c6fe RP |
111 | timer_data->delay_off = state; |
112 | mod_timer(&timer_data->timer, jiffies + 1); | |
3dc7b82e | 113 | ret = count; |
6655c6fe RP |
114 | } |
115 | ||
116 | return ret; | |
117 | } | |
118 | ||
119 | static CLASS_DEVICE_ATTR(delay_on, 0644, led_delay_on_show, | |
120 | led_delay_on_store); | |
121 | static CLASS_DEVICE_ATTR(delay_off, 0644, led_delay_off_show, | |
122 | led_delay_off_store); | |
123 | ||
124 | static void timer_trig_activate(struct led_classdev *led_cdev) | |
125 | { | |
126 | struct timer_trig_data *timer_data; | |
12fda168 | 127 | int rc; |
6655c6fe RP |
128 | |
129 | timer_data = kzalloc(sizeof(struct timer_trig_data), GFP_KERNEL); | |
130 | if (!timer_data) | |
131 | return; | |
132 | ||
133 | led_cdev->trigger_data = timer_data; | |
134 | ||
135 | init_timer(&timer_data->timer); | |
136 | timer_data->timer.function = led_timer_function; | |
137 | timer_data->timer.data = (unsigned long) led_cdev; | |
138 | ||
12fda168 | 139 | rc = class_device_create_file(led_cdev->class_dev, |
6655c6fe | 140 | &class_device_attr_delay_on); |
12fda168 JG |
141 | if (rc) goto err_out; |
142 | rc = class_device_create_file(led_cdev->class_dev, | |
6655c6fe | 143 | &class_device_attr_delay_off); |
12fda168 JG |
144 | if (rc) goto err_out_delayon; |
145 | ||
146 | return; | |
147 | ||
148 | err_out_delayon: | |
149 | class_device_remove_file(led_cdev->class_dev, | |
150 | &class_device_attr_delay_on); | |
151 | err_out: | |
152 | led_cdev->trigger_data = NULL; | |
153 | kfree(timer_data); | |
6655c6fe RP |
154 | } |
155 | ||
156 | static void timer_trig_deactivate(struct led_classdev *led_cdev) | |
157 | { | |
158 | struct timer_trig_data *timer_data = led_cdev->trigger_data; | |
159 | ||
160 | if (timer_data) { | |
161 | class_device_remove_file(led_cdev->class_dev, | |
162 | &class_device_attr_delay_on); | |
163 | class_device_remove_file(led_cdev->class_dev, | |
164 | &class_device_attr_delay_off); | |
165 | del_timer_sync(&timer_data->timer); | |
166 | kfree(timer_data); | |
167 | } | |
168 | } | |
169 | ||
170 | static struct led_trigger timer_led_trigger = { | |
171 | .name = "timer", | |
172 | .activate = timer_trig_activate, | |
173 | .deactivate = timer_trig_deactivate, | |
174 | }; | |
175 | ||
176 | static int __init timer_trig_init(void) | |
177 | { | |
178 | return led_trigger_register(&timer_led_trigger); | |
179 | } | |
180 | ||
181 | static void __exit timer_trig_exit(void) | |
182 | { | |
183 | led_trigger_unregister(&timer_led_trigger); | |
184 | } | |
185 | ||
186 | module_init(timer_trig_init); | |
187 | module_exit(timer_trig_exit); | |
188 | ||
189 | MODULE_AUTHOR("Richard Purdie <rpurdie@openedhand.com>"); | |
190 | MODULE_DESCRIPTION("Timer LED trigger"); | |
191 | MODULE_LICENSE("GPL"); |