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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 { | |
0013b23d NM |
28 | int brightness_on; /* LED brightness during "on" period. |
29 | * (LED_OFF < brightness_on <= LED_FULL) | |
30 | */ | |
6655c6fe RP |
31 | unsigned long delay_on; /* milliseconds on */ |
32 | unsigned long delay_off; /* milliseconds off */ | |
33 | struct timer_list timer; | |
34 | }; | |
35 | ||
36 | static void led_timer_function(unsigned long data) | |
37 | { | |
38 | struct led_classdev *led_cdev = (struct led_classdev *) data; | |
39 | struct timer_trig_data *timer_data = led_cdev->trigger_data; | |
0013b23d NM |
40 | unsigned long brightness; |
41 | unsigned long delay; | |
6655c6fe RP |
42 | |
43 | if (!timer_data->delay_on || !timer_data->delay_off) { | |
44 | led_set_brightness(led_cdev, LED_OFF); | |
45 | return; | |
46 | } | |
47 | ||
0013b23d NM |
48 | brightness = led_get_brightness(led_cdev); |
49 | if (!brightness) { | |
50 | /* Time to switch the LED on. */ | |
51 | brightness = timer_data->brightness_on; | |
6655c6fe | 52 | delay = timer_data->delay_on; |
0013b23d NM |
53 | } else { |
54 | /* Store the current brightness value to be able | |
55 | * to restore it when the delay_off period is over. | |
56 | */ | |
57 | timer_data->brightness_on = brightness; | |
58 | brightness = LED_OFF; | |
59 | delay = timer_data->delay_off; | |
6655c6fe RP |
60 | } |
61 | ||
62 | led_set_brightness(led_cdev, brightness); | |
63 | ||
64 | mod_timer(&timer_data->timer, jiffies + msecs_to_jiffies(delay)); | |
65 | } | |
66 | ||
f8a7c6fe RP |
67 | static ssize_t led_delay_on_show(struct device *dev, |
68 | struct device_attribute *attr, char *buf) | |
6655c6fe | 69 | { |
f8a7c6fe | 70 | struct led_classdev *led_cdev = dev_get_drvdata(dev); |
6655c6fe RP |
71 | struct timer_trig_data *timer_data = led_cdev->trigger_data; |
72 | ||
73 | sprintf(buf, "%lu\n", timer_data->delay_on); | |
74 | ||
75 | return strlen(buf) + 1; | |
76 | } | |
77 | ||
f8a7c6fe RP |
78 | static ssize_t led_delay_on_store(struct device *dev, |
79 | struct device_attribute *attr, const char *buf, size_t size) | |
6655c6fe | 80 | { |
f8a7c6fe | 81 | struct led_classdev *led_cdev = dev_get_drvdata(dev); |
6655c6fe RP |
82 | struct timer_trig_data *timer_data = led_cdev->trigger_data; |
83 | int ret = -EINVAL; | |
84 | char *after; | |
85 | unsigned long state = simple_strtoul(buf, &after, 10); | |
3dc7b82e | 86 | size_t count = after - buf; |
6655c6fe | 87 | |
3dc7b82e RP |
88 | if (*after && isspace(*after)) |
89 | count++; | |
90 | ||
91 | if (count == size) { | |
4c79141d MN |
92 | if (timer_data->delay_on != state) { |
93 | /* the new value differs from the previous */ | |
94 | timer_data->delay_on = state; | |
95 | ||
96 | /* deactivate previous settings */ | |
97 | del_timer_sync(&timer_data->timer); | |
98 | ||
99 | /* try to activate hardware acceleration, if any */ | |
100 | if (!led_cdev->blink_set || | |
101 | led_cdev->blink_set(led_cdev, | |
102 | &timer_data->delay_on, &timer_data->delay_off)) { | |
103 | /* no hardware acceleration, blink via timer */ | |
104 | mod_timer(&timer_data->timer, jiffies + 1); | |
105 | } | |
106 | } | |
3dc7b82e | 107 | ret = count; |
6655c6fe RP |
108 | } |
109 | ||
110 | return ret; | |
111 | } | |
112 | ||
f8a7c6fe RP |
113 | static ssize_t led_delay_off_show(struct device *dev, |
114 | struct device_attribute *attr, char *buf) | |
6655c6fe | 115 | { |
f8a7c6fe | 116 | struct led_classdev *led_cdev = dev_get_drvdata(dev); |
6655c6fe RP |
117 | struct timer_trig_data *timer_data = led_cdev->trigger_data; |
118 | ||
119 | sprintf(buf, "%lu\n", timer_data->delay_off); | |
120 | ||
121 | return strlen(buf) + 1; | |
122 | } | |
123 | ||
f8a7c6fe RP |
124 | static ssize_t led_delay_off_store(struct device *dev, |
125 | struct device_attribute *attr, const char *buf, size_t size) | |
6655c6fe | 126 | { |
f8a7c6fe | 127 | struct led_classdev *led_cdev = dev_get_drvdata(dev); |
6655c6fe RP |
128 | struct timer_trig_data *timer_data = led_cdev->trigger_data; |
129 | int ret = -EINVAL; | |
130 | char *after; | |
131 | unsigned long state = simple_strtoul(buf, &after, 10); | |
3dc7b82e RP |
132 | size_t count = after - buf; |
133 | ||
134 | if (*after && isspace(*after)) | |
135 | count++; | |
6655c6fe | 136 | |
3dc7b82e | 137 | if (count == size) { |
4c79141d MN |
138 | if (timer_data->delay_off != state) { |
139 | /* the new value differs from the previous */ | |
140 | timer_data->delay_off = state; | |
141 | ||
142 | /* deactivate previous settings */ | |
143 | del_timer_sync(&timer_data->timer); | |
144 | ||
145 | /* try to activate hardware acceleration, if any */ | |
146 | if (!led_cdev->blink_set || | |
147 | led_cdev->blink_set(led_cdev, | |
148 | &timer_data->delay_on, &timer_data->delay_off)) { | |
149 | /* no hardware acceleration, blink via timer */ | |
150 | mod_timer(&timer_data->timer, jiffies + 1); | |
151 | } | |
152 | } | |
3dc7b82e | 153 | ret = count; |
6655c6fe RP |
154 | } |
155 | ||
156 | return ret; | |
157 | } | |
158 | ||
f8a7c6fe RP |
159 | static DEVICE_ATTR(delay_on, 0644, led_delay_on_show, led_delay_on_store); |
160 | static DEVICE_ATTR(delay_off, 0644, led_delay_off_show, led_delay_off_store); | |
6655c6fe RP |
161 | |
162 | static void timer_trig_activate(struct led_classdev *led_cdev) | |
163 | { | |
164 | struct timer_trig_data *timer_data; | |
12fda168 | 165 | int rc; |
6655c6fe RP |
166 | |
167 | timer_data = kzalloc(sizeof(struct timer_trig_data), GFP_KERNEL); | |
168 | if (!timer_data) | |
169 | return; | |
170 | ||
0013b23d NM |
171 | timer_data->brightness_on = led_get_brightness(led_cdev); |
172 | if (timer_data->brightness_on == LED_OFF) | |
173 | timer_data->brightness_on = LED_FULL; | |
6655c6fe RP |
174 | led_cdev->trigger_data = timer_data; |
175 | ||
176 | init_timer(&timer_data->timer); | |
177 | timer_data->timer.function = led_timer_function; | |
178 | timer_data->timer.data = (unsigned long) led_cdev; | |
179 | ||
f8a7c6fe RP |
180 | rc = device_create_file(led_cdev->dev, &dev_attr_delay_on); |
181 | if (rc) | |
182 | goto err_out; | |
183 | rc = device_create_file(led_cdev->dev, &dev_attr_delay_off); | |
184 | if (rc) | |
185 | goto err_out_delayon; | |
12fda168 | 186 | |
4c79141d MN |
187 | /* If there is hardware support for blinking, start one |
188 | * user friendly blink rate chosen by the driver. | |
189 | */ | |
190 | if (led_cdev->blink_set) | |
191 | led_cdev->blink_set(led_cdev, | |
192 | &timer_data->delay_on, &timer_data->delay_off); | |
193 | ||
12fda168 JG |
194 | return; |
195 | ||
196 | err_out_delayon: | |
f8a7c6fe | 197 | device_remove_file(led_cdev->dev, &dev_attr_delay_on); |
12fda168 JG |
198 | err_out: |
199 | led_cdev->trigger_data = NULL; | |
200 | kfree(timer_data); | |
6655c6fe RP |
201 | } |
202 | ||
203 | static void timer_trig_deactivate(struct led_classdev *led_cdev) | |
204 | { | |
205 | struct timer_trig_data *timer_data = led_cdev->trigger_data; | |
206 | ||
207 | if (timer_data) { | |
f8a7c6fe RP |
208 | device_remove_file(led_cdev->dev, &dev_attr_delay_on); |
209 | device_remove_file(led_cdev->dev, &dev_attr_delay_off); | |
6655c6fe RP |
210 | del_timer_sync(&timer_data->timer); |
211 | kfree(timer_data); | |
212 | } | |
213 | } | |
214 | ||
215 | static struct led_trigger timer_led_trigger = { | |
216 | .name = "timer", | |
217 | .activate = timer_trig_activate, | |
218 | .deactivate = timer_trig_deactivate, | |
219 | }; | |
220 | ||
221 | static int __init timer_trig_init(void) | |
222 | { | |
223 | return led_trigger_register(&timer_led_trigger); | |
224 | } | |
225 | ||
226 | static void __exit timer_trig_exit(void) | |
227 | { | |
228 | led_trigger_unregister(&timer_led_trigger); | |
229 | } | |
230 | ||
231 | module_init(timer_trig_init); | |
232 | module_exit(timer_trig_exit); | |
233 | ||
234 | MODULE_AUTHOR("Richard Purdie <rpurdie@openedhand.com>"); | |
235 | MODULE_DESCRIPTION("Timer LED trigger"); | |
236 | MODULE_LICENSE("GPL"); |