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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 | 24 | #include <linux/leds.h> |
5a0e3ad6 | 25 | #include <linux/slab.h> |
6655c6fe RP |
26 | #include "leds.h" |
27 | ||
28 | struct timer_trig_data { | |
0013b23d NM |
29 | int brightness_on; /* LED brightness during "on" period. |
30 | * (LED_OFF < brightness_on <= LED_FULL) | |
31 | */ | |
6655c6fe RP |
32 | unsigned long delay_on; /* milliseconds on */ |
33 | unsigned long delay_off; /* milliseconds off */ | |
34 | struct timer_list timer; | |
35 | }; | |
36 | ||
37 | static void led_timer_function(unsigned long data) | |
38 | { | |
39 | struct led_classdev *led_cdev = (struct led_classdev *) data; | |
40 | struct timer_trig_data *timer_data = led_cdev->trigger_data; | |
0013b23d NM |
41 | unsigned long brightness; |
42 | unsigned long delay; | |
6655c6fe RP |
43 | |
44 | if (!timer_data->delay_on || !timer_data->delay_off) { | |
45 | led_set_brightness(led_cdev, LED_OFF); | |
46 | return; | |
47 | } | |
48 | ||
0013b23d NM |
49 | brightness = led_get_brightness(led_cdev); |
50 | if (!brightness) { | |
51 | /* Time to switch the LED on. */ | |
52 | brightness = timer_data->brightness_on; | |
6655c6fe | 53 | delay = timer_data->delay_on; |
0013b23d NM |
54 | } else { |
55 | /* Store the current brightness value to be able | |
56 | * to restore it when the delay_off period is over. | |
57 | */ | |
58 | timer_data->brightness_on = brightness; | |
59 | brightness = LED_OFF; | |
60 | delay = timer_data->delay_off; | |
6655c6fe RP |
61 | } |
62 | ||
63 | led_set_brightness(led_cdev, brightness); | |
64 | ||
65 | mod_timer(&timer_data->timer, jiffies + msecs_to_jiffies(delay)); | |
66 | } | |
67 | ||
4d404fd5 | 68 | static ssize_t led_delay_on_show(struct device *dev, |
f8a7c6fe | 69 | struct device_attribute *attr, char *buf) |
6655c6fe | 70 | { |
f8a7c6fe | 71 | struct led_classdev *led_cdev = dev_get_drvdata(dev); |
6655c6fe RP |
72 | struct timer_trig_data *timer_data = led_cdev->trigger_data; |
73 | ||
dd8e5a20 | 74 | return sprintf(buf, "%lu\n", timer_data->delay_on); |
6655c6fe RP |
75 | } |
76 | ||
4d404fd5 | 77 | static ssize_t led_delay_on_store(struct device *dev, |
f8a7c6fe | 78 | struct device_attribute *attr, const char *buf, size_t size) |
6655c6fe | 79 | { |
f8a7c6fe | 80 | struct led_classdev *led_cdev = dev_get_drvdata(dev); |
6655c6fe RP |
81 | struct timer_trig_data *timer_data = led_cdev->trigger_data; |
82 | int ret = -EINVAL; | |
83 | char *after; | |
84 | unsigned long state = simple_strtoul(buf, &after, 10); | |
3dc7b82e | 85 | size_t count = after - buf; |
6655c6fe | 86 | |
e7d2860b | 87 | if (isspace(*after)) |
3dc7b82e RP |
88 | count++; |
89 | ||
90 | if (count == size) { | |
4c79141d MN |
91 | if (timer_data->delay_on != state) { |
92 | /* the new value differs from the previous */ | |
93 | timer_data->delay_on = state; | |
94 | ||
95 | /* deactivate previous settings */ | |
96 | del_timer_sync(&timer_data->timer); | |
97 | ||
98 | /* try to activate hardware acceleration, if any */ | |
99 | if (!led_cdev->blink_set || | |
100 | led_cdev->blink_set(led_cdev, | |
4d404fd5 | 101 | &timer_data->delay_on, &timer_data->delay_off)) { |
4c79141d MN |
102 | /* no hardware acceleration, blink via timer */ |
103 | mod_timer(&timer_data->timer, jiffies + 1); | |
104 | } | |
105 | } | |
3dc7b82e | 106 | ret = count; |
6655c6fe RP |
107 | } |
108 | ||
109 | return ret; | |
110 | } | |
111 | ||
4d404fd5 | 112 | static ssize_t led_delay_off_show(struct device *dev, |
f8a7c6fe | 113 | struct device_attribute *attr, char *buf) |
6655c6fe | 114 | { |
f8a7c6fe | 115 | struct led_classdev *led_cdev = dev_get_drvdata(dev); |
6655c6fe RP |
116 | struct timer_trig_data *timer_data = led_cdev->trigger_data; |
117 | ||
dd8e5a20 | 118 | return sprintf(buf, "%lu\n", timer_data->delay_off); |
6655c6fe RP |
119 | } |
120 | ||
4d404fd5 | 121 | static ssize_t led_delay_off_store(struct device *dev, |
f8a7c6fe | 122 | struct device_attribute *attr, const char *buf, size_t size) |
6655c6fe | 123 | { |
f8a7c6fe | 124 | struct led_classdev *led_cdev = dev_get_drvdata(dev); |
6655c6fe RP |
125 | struct timer_trig_data *timer_data = led_cdev->trigger_data; |
126 | int ret = -EINVAL; | |
127 | char *after; | |
128 | unsigned long state = simple_strtoul(buf, &after, 10); | |
3dc7b82e RP |
129 | size_t count = after - buf; |
130 | ||
e7d2860b | 131 | if (isspace(*after)) |
3dc7b82e | 132 | count++; |
6655c6fe | 133 | |
3dc7b82e | 134 | if (count == size) { |
4c79141d MN |
135 | if (timer_data->delay_off != state) { |
136 | /* the new value differs from the previous */ | |
137 | timer_data->delay_off = state; | |
138 | ||
139 | /* deactivate previous settings */ | |
140 | del_timer_sync(&timer_data->timer); | |
141 | ||
142 | /* try to activate hardware acceleration, if any */ | |
143 | if (!led_cdev->blink_set || | |
144 | led_cdev->blink_set(led_cdev, | |
4d404fd5 | 145 | &timer_data->delay_on, &timer_data->delay_off)) { |
4c79141d MN |
146 | /* no hardware acceleration, blink via timer */ |
147 | mod_timer(&timer_data->timer, jiffies + 1); | |
148 | } | |
149 | } | |
3dc7b82e | 150 | ret = count; |
6655c6fe RP |
151 | } |
152 | ||
153 | return ret; | |
154 | } | |
155 | ||
f8a7c6fe RP |
156 | static DEVICE_ATTR(delay_on, 0644, led_delay_on_show, led_delay_on_store); |
157 | static DEVICE_ATTR(delay_off, 0644, led_delay_off_show, led_delay_off_store); | |
6655c6fe RP |
158 | |
159 | static void timer_trig_activate(struct led_classdev *led_cdev) | |
160 | { | |
161 | struct timer_trig_data *timer_data; | |
12fda168 | 162 | int rc; |
6655c6fe RP |
163 | |
164 | timer_data = kzalloc(sizeof(struct timer_trig_data), GFP_KERNEL); | |
165 | if (!timer_data) | |
166 | return; | |
167 | ||
0013b23d NM |
168 | timer_data->brightness_on = led_get_brightness(led_cdev); |
169 | if (timer_data->brightness_on == LED_OFF) | |
1bd465e6 | 170 | timer_data->brightness_on = led_cdev->max_brightness; |
6655c6fe RP |
171 | led_cdev->trigger_data = timer_data; |
172 | ||
173 | init_timer(&timer_data->timer); | |
174 | timer_data->timer.function = led_timer_function; | |
175 | timer_data->timer.data = (unsigned long) led_cdev; | |
176 | ||
f8a7c6fe RP |
177 | rc = device_create_file(led_cdev->dev, &dev_attr_delay_on); |
178 | if (rc) | |
179 | goto err_out; | |
180 | rc = device_create_file(led_cdev->dev, &dev_attr_delay_off); | |
181 | if (rc) | |
182 | goto err_out_delayon; | |
12fda168 | 183 | |
4c79141d MN |
184 | /* If there is hardware support for blinking, start one |
185 | * user friendly blink rate chosen by the driver. | |
186 | */ | |
187 | if (led_cdev->blink_set) | |
188 | led_cdev->blink_set(led_cdev, | |
189 | &timer_data->delay_on, &timer_data->delay_off); | |
190 | ||
12fda168 JG |
191 | return; |
192 | ||
193 | err_out_delayon: | |
f8a7c6fe | 194 | device_remove_file(led_cdev->dev, &dev_attr_delay_on); |
12fda168 JG |
195 | err_out: |
196 | led_cdev->trigger_data = NULL; | |
197 | kfree(timer_data); | |
6655c6fe RP |
198 | } |
199 | ||
200 | static void timer_trig_deactivate(struct led_classdev *led_cdev) | |
201 | { | |
202 | struct timer_trig_data *timer_data = led_cdev->trigger_data; | |
ce70a245 | 203 | unsigned long on = 0, off = 0; |
6655c6fe RP |
204 | |
205 | if (timer_data) { | |
f8a7c6fe RP |
206 | device_remove_file(led_cdev->dev, &dev_attr_delay_on); |
207 | device_remove_file(led_cdev->dev, &dev_attr_delay_off); | |
6655c6fe RP |
208 | del_timer_sync(&timer_data->timer); |
209 | kfree(timer_data); | |
210 | } | |
ce70a245 RG |
211 | |
212 | /* If there is hardware support for blinking, stop it */ | |
213 | if (led_cdev->blink_set) | |
214 | led_cdev->blink_set(led_cdev, &on, &off); | |
6655c6fe RP |
215 | } |
216 | ||
217 | static struct led_trigger timer_led_trigger = { | |
218 | .name = "timer", | |
219 | .activate = timer_trig_activate, | |
220 | .deactivate = timer_trig_deactivate, | |
221 | }; | |
222 | ||
223 | static int __init timer_trig_init(void) | |
224 | { | |
225 | return led_trigger_register(&timer_led_trigger); | |
226 | } | |
227 | ||
228 | static void __exit timer_trig_exit(void) | |
229 | { | |
230 | led_trigger_unregister(&timer_led_trigger); | |
231 | } | |
232 | ||
233 | module_init(timer_trig_init); | |
234 | module_exit(timer_trig_exit); | |
235 | ||
236 | MODULE_AUTHOR("Richard Purdie <rpurdie@openedhand.com>"); | |
237 | MODULE_DESCRIPTION("Timer LED trigger"); | |
238 | MODULE_LICENSE("GPL"); |