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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 | ||
4d404fd5 | 67 | static ssize_t led_delay_on_show(struct device *dev, |
f8a7c6fe | 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 | ||
dd8e5a20 | 73 | return sprintf(buf, "%lu\n", timer_data->delay_on); |
6655c6fe RP |
74 | } |
75 | ||
4d404fd5 | 76 | static ssize_t led_delay_on_store(struct device *dev, |
f8a7c6fe | 77 | struct device_attribute *attr, const char *buf, size_t size) |
6655c6fe | 78 | { |
f8a7c6fe | 79 | struct led_classdev *led_cdev = dev_get_drvdata(dev); |
6655c6fe RP |
80 | struct timer_trig_data *timer_data = led_cdev->trigger_data; |
81 | int ret = -EINVAL; | |
82 | char *after; | |
83 | unsigned long state = simple_strtoul(buf, &after, 10); | |
3dc7b82e | 84 | size_t count = after - buf; |
6655c6fe | 85 | |
3dc7b82e RP |
86 | if (*after && isspace(*after)) |
87 | count++; | |
88 | ||
89 | if (count == size) { | |
4c79141d MN |
90 | if (timer_data->delay_on != state) { |
91 | /* the new value differs from the previous */ | |
92 | timer_data->delay_on = state; | |
93 | ||
94 | /* deactivate previous settings */ | |
95 | del_timer_sync(&timer_data->timer); | |
96 | ||
97 | /* try to activate hardware acceleration, if any */ | |
98 | if (!led_cdev->blink_set || | |
99 | led_cdev->blink_set(led_cdev, | |
4d404fd5 | 100 | &timer_data->delay_on, &timer_data->delay_off)) { |
4c79141d MN |
101 | /* no hardware acceleration, blink via timer */ |
102 | mod_timer(&timer_data->timer, jiffies + 1); | |
103 | } | |
104 | } | |
3dc7b82e | 105 | ret = count; |
6655c6fe RP |
106 | } |
107 | ||
108 | return ret; | |
109 | } | |
110 | ||
4d404fd5 | 111 | static ssize_t led_delay_off_show(struct device *dev, |
f8a7c6fe | 112 | struct device_attribute *attr, char *buf) |
6655c6fe | 113 | { |
f8a7c6fe | 114 | struct led_classdev *led_cdev = dev_get_drvdata(dev); |
6655c6fe RP |
115 | struct timer_trig_data *timer_data = led_cdev->trigger_data; |
116 | ||
dd8e5a20 | 117 | return sprintf(buf, "%lu\n", timer_data->delay_off); |
6655c6fe RP |
118 | } |
119 | ||
4d404fd5 | 120 | static ssize_t led_delay_off_store(struct device *dev, |
f8a7c6fe | 121 | struct device_attribute *attr, const char *buf, size_t size) |
6655c6fe | 122 | { |
f8a7c6fe | 123 | struct led_classdev *led_cdev = dev_get_drvdata(dev); |
6655c6fe RP |
124 | struct timer_trig_data *timer_data = led_cdev->trigger_data; |
125 | int ret = -EINVAL; | |
126 | char *after; | |
127 | unsigned long state = simple_strtoul(buf, &after, 10); | |
3dc7b82e RP |
128 | size_t count = after - buf; |
129 | ||
130 | if (*after && isspace(*after)) | |
131 | count++; | |
6655c6fe | 132 | |
3dc7b82e | 133 | if (count == size) { |
4c79141d MN |
134 | if (timer_data->delay_off != state) { |
135 | /* the new value differs from the previous */ | |
136 | timer_data->delay_off = state; | |
137 | ||
138 | /* deactivate previous settings */ | |
139 | del_timer_sync(&timer_data->timer); | |
140 | ||
141 | /* try to activate hardware acceleration, if any */ | |
142 | if (!led_cdev->blink_set || | |
143 | led_cdev->blink_set(led_cdev, | |
4d404fd5 | 144 | &timer_data->delay_on, &timer_data->delay_off)) { |
4c79141d MN |
145 | /* no hardware acceleration, blink via timer */ |
146 | mod_timer(&timer_data->timer, jiffies + 1); | |
147 | } | |
148 | } | |
3dc7b82e | 149 | ret = count; |
6655c6fe RP |
150 | } |
151 | ||
152 | return ret; | |
153 | } | |
154 | ||
f8a7c6fe RP |
155 | static DEVICE_ATTR(delay_on, 0644, led_delay_on_show, led_delay_on_store); |
156 | static DEVICE_ATTR(delay_off, 0644, led_delay_off_show, led_delay_off_store); | |
6655c6fe RP |
157 | |
158 | static void timer_trig_activate(struct led_classdev *led_cdev) | |
159 | { | |
160 | struct timer_trig_data *timer_data; | |
12fda168 | 161 | int rc; |
6655c6fe RP |
162 | |
163 | timer_data = kzalloc(sizeof(struct timer_trig_data), GFP_KERNEL); | |
164 | if (!timer_data) | |
165 | return; | |
166 | ||
0013b23d NM |
167 | timer_data->brightness_on = led_get_brightness(led_cdev); |
168 | if (timer_data->brightness_on == LED_OFF) | |
169 | timer_data->brightness_on = LED_FULL; | |
6655c6fe RP |
170 | led_cdev->trigger_data = timer_data; |
171 | ||
172 | init_timer(&timer_data->timer); | |
173 | timer_data->timer.function = led_timer_function; | |
174 | timer_data->timer.data = (unsigned long) led_cdev; | |
175 | ||
f8a7c6fe RP |
176 | rc = device_create_file(led_cdev->dev, &dev_attr_delay_on); |
177 | if (rc) | |
178 | goto err_out; | |
179 | rc = device_create_file(led_cdev->dev, &dev_attr_delay_off); | |
180 | if (rc) | |
181 | goto err_out_delayon; | |
12fda168 | 182 | |
4c79141d MN |
183 | /* If there is hardware support for blinking, start one |
184 | * user friendly blink rate chosen by the driver. | |
185 | */ | |
186 | if (led_cdev->blink_set) | |
187 | led_cdev->blink_set(led_cdev, | |
188 | &timer_data->delay_on, &timer_data->delay_off); | |
189 | ||
12fda168 JG |
190 | return; |
191 | ||
192 | err_out_delayon: | |
f8a7c6fe | 193 | device_remove_file(led_cdev->dev, &dev_attr_delay_on); |
12fda168 JG |
194 | err_out: |
195 | led_cdev->trigger_data = NULL; | |
196 | kfree(timer_data); | |
6655c6fe RP |
197 | } |
198 | ||
199 | static void timer_trig_deactivate(struct led_classdev *led_cdev) | |
200 | { | |
201 | struct timer_trig_data *timer_data = led_cdev->trigger_data; | |
ce70a245 | 202 | unsigned long on = 0, off = 0; |
6655c6fe RP |
203 | |
204 | if (timer_data) { | |
f8a7c6fe RP |
205 | device_remove_file(led_cdev->dev, &dev_attr_delay_on); |
206 | device_remove_file(led_cdev->dev, &dev_attr_delay_off); | |
6655c6fe RP |
207 | del_timer_sync(&timer_data->timer); |
208 | kfree(timer_data); | |
209 | } | |
ce70a245 RG |
210 | |
211 | /* If there is hardware support for blinking, stop it */ | |
212 | if (led_cdev->blink_set) | |
213 | led_cdev->blink_set(led_cdev, &on, &off); | |
6655c6fe RP |
214 | } |
215 | ||
216 | static struct led_trigger timer_led_trigger = { | |
217 | .name = "timer", | |
218 | .activate = timer_trig_activate, | |
219 | .deactivate = timer_trig_deactivate, | |
220 | }; | |
221 | ||
222 | static int __init timer_trig_init(void) | |
223 | { | |
224 | return led_trigger_register(&timer_led_trigger); | |
225 | } | |
226 | ||
227 | static void __exit timer_trig_exit(void) | |
228 | { | |
229 | led_trigger_unregister(&timer_led_trigger); | |
230 | } | |
231 | ||
232 | module_init(timer_trig_init); | |
233 | module_exit(timer_trig_exit); | |
234 | ||
235 | MODULE_AUTHOR("Richard Purdie <rpurdie@openedhand.com>"); | |
236 | MODULE_DESCRIPTION("Timer LED trigger"); | |
237 | MODULE_LICENSE("GPL"); |