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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 | ||
f8a7c6fe RP |
55 | static ssize_t led_delay_on_show(struct device *dev, |
56 | struct device_attribute *attr, char *buf) | |
6655c6fe | 57 | { |
f8a7c6fe | 58 | struct led_classdev *led_cdev = dev_get_drvdata(dev); |
6655c6fe RP |
59 | struct timer_trig_data *timer_data = led_cdev->trigger_data; |
60 | ||
61 | sprintf(buf, "%lu\n", timer_data->delay_on); | |
62 | ||
63 | return strlen(buf) + 1; | |
64 | } | |
65 | ||
f8a7c6fe RP |
66 | static ssize_t led_delay_on_store(struct device *dev, |
67 | struct device_attribute *attr, const char *buf, size_t size) | |
6655c6fe | 68 | { |
f8a7c6fe | 69 | struct led_classdev *led_cdev = dev_get_drvdata(dev); |
6655c6fe RP |
70 | struct timer_trig_data *timer_data = led_cdev->trigger_data; |
71 | int ret = -EINVAL; | |
72 | char *after; | |
73 | unsigned long state = simple_strtoul(buf, &after, 10); | |
3dc7b82e | 74 | size_t count = after - buf; |
6655c6fe | 75 | |
3dc7b82e RP |
76 | if (*after && isspace(*after)) |
77 | count++; | |
78 | ||
79 | if (count == size) { | |
6655c6fe RP |
80 | timer_data->delay_on = state; |
81 | mod_timer(&timer_data->timer, jiffies + 1); | |
3dc7b82e | 82 | ret = count; |
6655c6fe RP |
83 | } |
84 | ||
85 | return ret; | |
86 | } | |
87 | ||
f8a7c6fe RP |
88 | static ssize_t led_delay_off_show(struct device *dev, |
89 | struct device_attribute *attr, char *buf) | |
6655c6fe | 90 | { |
f8a7c6fe | 91 | struct led_classdev *led_cdev = dev_get_drvdata(dev); |
6655c6fe RP |
92 | struct timer_trig_data *timer_data = led_cdev->trigger_data; |
93 | ||
94 | sprintf(buf, "%lu\n", timer_data->delay_off); | |
95 | ||
96 | return strlen(buf) + 1; | |
97 | } | |
98 | ||
f8a7c6fe RP |
99 | static ssize_t led_delay_off_store(struct device *dev, |
100 | struct device_attribute *attr, const char *buf, size_t size) | |
6655c6fe | 101 | { |
f8a7c6fe | 102 | struct led_classdev *led_cdev = dev_get_drvdata(dev); |
6655c6fe RP |
103 | struct timer_trig_data *timer_data = led_cdev->trigger_data; |
104 | int ret = -EINVAL; | |
105 | char *after; | |
106 | unsigned long state = simple_strtoul(buf, &after, 10); | |
3dc7b82e RP |
107 | size_t count = after - buf; |
108 | ||
109 | if (*after && isspace(*after)) | |
110 | count++; | |
6655c6fe | 111 | |
3dc7b82e | 112 | if (count == size) { |
6655c6fe RP |
113 | timer_data->delay_off = state; |
114 | mod_timer(&timer_data->timer, jiffies + 1); | |
3dc7b82e | 115 | ret = count; |
6655c6fe RP |
116 | } |
117 | ||
118 | return ret; | |
119 | } | |
120 | ||
f8a7c6fe RP |
121 | static DEVICE_ATTR(delay_on, 0644, led_delay_on_show, led_delay_on_store); |
122 | static DEVICE_ATTR(delay_off, 0644, led_delay_off_show, led_delay_off_store); | |
6655c6fe RP |
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 | ||
f8a7c6fe RP |
139 | rc = device_create_file(led_cdev->dev, &dev_attr_delay_on); |
140 | if (rc) | |
141 | goto err_out; | |
142 | rc = device_create_file(led_cdev->dev, &dev_attr_delay_off); | |
143 | if (rc) | |
144 | goto err_out_delayon; | |
12fda168 JG |
145 | |
146 | return; | |
147 | ||
148 | err_out_delayon: | |
f8a7c6fe | 149 | device_remove_file(led_cdev->dev, &dev_attr_delay_on); |
12fda168 JG |
150 | err_out: |
151 | led_cdev->trigger_data = NULL; | |
152 | kfree(timer_data); | |
6655c6fe RP |
153 | } |
154 | ||
155 | static void timer_trig_deactivate(struct led_classdev *led_cdev) | |
156 | { | |
157 | struct timer_trig_data *timer_data = led_cdev->trigger_data; | |
158 | ||
159 | if (timer_data) { | |
f8a7c6fe RP |
160 | device_remove_file(led_cdev->dev, &dev_attr_delay_on); |
161 | device_remove_file(led_cdev->dev, &dev_attr_delay_off); | |
6655c6fe RP |
162 | del_timer_sync(&timer_data->timer); |
163 | kfree(timer_data); | |
164 | } | |
165 | } | |
166 | ||
167 | static struct led_trigger timer_led_trigger = { | |
168 | .name = "timer", | |
169 | .activate = timer_trig_activate, | |
170 | .deactivate = timer_trig_deactivate, | |
171 | }; | |
172 | ||
173 | static int __init timer_trig_init(void) | |
174 | { | |
175 | return led_trigger_register(&timer_led_trigger); | |
176 | } | |
177 | ||
178 | static void __exit timer_trig_exit(void) | |
179 | { | |
180 | led_trigger_unregister(&timer_led_trigger); | |
181 | } | |
182 | ||
183 | module_init(timer_trig_init); | |
184 | module_exit(timer_trig_exit); | |
185 | ||
186 | MODULE_AUTHOR("Richard Purdie <rpurdie@openedhand.com>"); | |
187 | MODULE_DESCRIPTION("Timer LED trigger"); | |
188 | MODULE_LICENSE("GPL"); |