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c72a1d60 RP |
1 | /* |
2 | * LED Class Core | |
3 | * | |
4 | * Copyright (C) 2005 John Lenz <lenz@cs.wisc.edu> | |
f8a7c6fe | 5 | * Copyright (C) 2005-2007 Richard Purdie <rpurdie@openedhand.com> |
c72a1d60 RP |
6 | * |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
10 | */ | |
11 | ||
c72a1d60 RP |
12 | #include <linux/module.h> |
13 | #include <linux/kernel.h> | |
14 | #include <linux/init.h> | |
15 | #include <linux/list.h> | |
16 | #include <linux/spinlock.h> | |
17 | #include <linux/device.h> | |
18 | #include <linux/sysdev.h> | |
19 | #include <linux/timer.h> | |
20 | #include <linux/err.h> | |
3dc7b82e | 21 | #include <linux/ctype.h> |
c72a1d60 RP |
22 | #include <linux/leds.h> |
23 | #include "leds.h" | |
24 | ||
25 | static struct class *leds_class; | |
26 | ||
29d76dfa HMH |
27 | static void led_update_brightness(struct led_classdev *led_cdev) |
28 | { | |
29 | if (led_cdev->brightness_get) | |
30 | led_cdev->brightness = led_cdev->brightness_get(led_cdev); | |
31 | } | |
32 | ||
f8a7c6fe RP |
33 | static ssize_t led_brightness_show(struct device *dev, |
34 | struct device_attribute *attr, char *buf) | |
c72a1d60 | 35 | { |
f8a7c6fe | 36 | struct led_classdev *led_cdev = dev_get_drvdata(dev); |
c72a1d60 RP |
37 | |
38 | /* no lock needed for this */ | |
29d76dfa | 39 | led_update_brightness(led_cdev); |
c72a1d60 | 40 | |
dd8e5a20 | 41 | return sprintf(buf, "%u\n", led_cdev->brightness); |
c72a1d60 RP |
42 | } |
43 | ||
f8a7c6fe RP |
44 | static ssize_t led_brightness_store(struct device *dev, |
45 | struct device_attribute *attr, const char *buf, size_t size) | |
c72a1d60 | 46 | { |
f8a7c6fe | 47 | struct led_classdev *led_cdev = dev_get_drvdata(dev); |
c72a1d60 RP |
48 | ssize_t ret = -EINVAL; |
49 | char *after; | |
50 | unsigned long state = simple_strtoul(buf, &after, 10); | |
3dc7b82e | 51 | size_t count = after - buf; |
c72a1d60 | 52 | |
e7d2860b | 53 | if (isspace(*after)) |
3dc7b82e RP |
54 | count++; |
55 | ||
56 | if (count == size) { | |
57 | ret = count; | |
0013b23d NM |
58 | |
59 | if (state == LED_OFF) | |
60 | led_trigger_remove(led_cdev); | |
c72a1d60 RP |
61 | led_set_brightness(led_cdev, state); |
62 | } | |
63 | ||
64 | return ret; | |
65 | } | |
66 | ||
1bd465e6 GL |
67 | static ssize_t led_max_brightness_show(struct device *dev, |
68 | struct device_attribute *attr, char *buf) | |
69 | { | |
70 | struct led_classdev *led_cdev = dev_get_drvdata(dev); | |
71 | ||
72 | return sprintf(buf, "%u\n", led_cdev->max_brightness); | |
73 | } | |
74 | ||
14b5d6dd FF |
75 | static struct device_attribute led_class_attrs[] = { |
76 | __ATTR(brightness, 0644, led_brightness_show, led_brightness_store), | |
569762ef | 77 | __ATTR(max_brightness, 0444, led_max_brightness_show, NULL), |
c3bc9956 | 78 | #ifdef CONFIG_LEDS_TRIGGERS |
14b5d6dd | 79 | __ATTR(trigger, 0644, led_trigger_show, led_trigger_store), |
c3bc9956 | 80 | #endif |
14b5d6dd FF |
81 | __ATTR_NULL, |
82 | }; | |
c72a1d60 | 83 | |
5ada28bf JB |
84 | static void led_timer_function(unsigned long data) |
85 | { | |
86 | struct led_classdev *led_cdev = (void *)data; | |
87 | unsigned long brightness; | |
88 | unsigned long delay; | |
89 | ||
90 | if (!led_cdev->blink_delay_on || !led_cdev->blink_delay_off) { | |
91 | led_set_brightness(led_cdev, LED_OFF); | |
92 | return; | |
93 | } | |
94 | ||
95 | brightness = led_get_brightness(led_cdev); | |
96 | if (!brightness) { | |
97 | /* Time to switch the LED on. */ | |
98 | brightness = led_cdev->blink_brightness; | |
99 | delay = led_cdev->blink_delay_on; | |
100 | } else { | |
101 | /* Store the current brightness value to be able | |
102 | * to restore it when the delay_off period is over. | |
103 | */ | |
104 | led_cdev->blink_brightness = brightness; | |
105 | brightness = LED_OFF; | |
106 | delay = led_cdev->blink_delay_off; | |
107 | } | |
108 | ||
109 | led_set_brightness(led_cdev, brightness); | |
110 | ||
111 | mod_timer(&led_cdev->blink_timer, jiffies + msecs_to_jiffies(delay)); | |
112 | } | |
113 | ||
114 | static void led_stop_software_blink(struct led_classdev *led_cdev) | |
115 | { | |
116 | /* deactivate previous settings */ | |
117 | del_timer_sync(&led_cdev->blink_timer); | |
118 | led_cdev->blink_delay_on = 0; | |
119 | led_cdev->blink_delay_off = 0; | |
120 | } | |
121 | ||
122 | static void led_set_software_blink(struct led_classdev *led_cdev, | |
123 | unsigned long delay_on, | |
124 | unsigned long delay_off) | |
125 | { | |
126 | int current_brightness; | |
127 | ||
128 | current_brightness = led_get_brightness(led_cdev); | |
129 | if (current_brightness) | |
130 | led_cdev->blink_brightness = current_brightness; | |
131 | if (!led_cdev->blink_brightness) | |
132 | led_cdev->blink_brightness = led_cdev->max_brightness; | |
133 | ||
fff26f81 EH |
134 | if (led_get_trigger_data(led_cdev) && |
135 | delay_on == led_cdev->blink_delay_on && | |
5ada28bf JB |
136 | delay_off == led_cdev->blink_delay_off) |
137 | return; | |
138 | ||
139 | led_stop_software_blink(led_cdev); | |
140 | ||
141 | led_cdev->blink_delay_on = delay_on; | |
142 | led_cdev->blink_delay_off = delay_off; | |
143 | ||
144 | /* never on - don't blink */ | |
145 | if (!delay_on) | |
146 | return; | |
147 | ||
148 | /* never off - just set to brightness */ | |
149 | if (!delay_off) { | |
150 | led_set_brightness(led_cdev, led_cdev->blink_brightness); | |
151 | return; | |
152 | } | |
153 | ||
154 | mod_timer(&led_cdev->blink_timer, jiffies + 1); | |
155 | } | |
156 | ||
157 | ||
c72a1d60 RP |
158 | /** |
159 | * led_classdev_suspend - suspend an led_classdev. | |
160 | * @led_cdev: the led_classdev to suspend. | |
161 | */ | |
162 | void led_classdev_suspend(struct led_classdev *led_cdev) | |
163 | { | |
164 | led_cdev->flags |= LED_SUSPENDED; | |
165 | led_cdev->brightness_set(led_cdev, 0); | |
166 | } | |
167 | EXPORT_SYMBOL_GPL(led_classdev_suspend); | |
168 | ||
169 | /** | |
170 | * led_classdev_resume - resume an led_classdev. | |
171 | * @led_cdev: the led_classdev to resume. | |
172 | */ | |
173 | void led_classdev_resume(struct led_classdev *led_cdev) | |
174 | { | |
175 | led_cdev->brightness_set(led_cdev, led_cdev->brightness); | |
176 | led_cdev->flags &= ~LED_SUSPENDED; | |
177 | } | |
178 | EXPORT_SYMBOL_GPL(led_classdev_resume); | |
179 | ||
859cb7f2 RP |
180 | static int led_suspend(struct device *dev, pm_message_t state) |
181 | { | |
182 | struct led_classdev *led_cdev = dev_get_drvdata(dev); | |
183 | ||
184 | if (led_cdev->flags & LED_CORE_SUSPENDRESUME) | |
185 | led_classdev_suspend(led_cdev); | |
186 | ||
187 | return 0; | |
188 | } | |
189 | ||
190 | static int led_resume(struct device *dev) | |
191 | { | |
192 | struct led_classdev *led_cdev = dev_get_drvdata(dev); | |
193 | ||
194 | if (led_cdev->flags & LED_CORE_SUSPENDRESUME) | |
195 | led_classdev_resume(led_cdev); | |
196 | ||
197 | return 0; | |
198 | } | |
199 | ||
c72a1d60 RP |
200 | /** |
201 | * led_classdev_register - register a new object of led_classdev class. | |
ff8649af | 202 | * @parent: The device to register. |
c72a1d60 RP |
203 | * @led_cdev: the led_classdev structure for this device. |
204 | */ | |
205 | int led_classdev_register(struct device *parent, struct led_classdev *led_cdev) | |
206 | { | |
a9b12619 GKH |
207 | led_cdev->dev = device_create(leds_class, parent, 0, led_cdev, |
208 | "%s", led_cdev->name); | |
801678c5 | 209 | if (IS_ERR(led_cdev->dev)) |
f8a7c6fe | 210 | return PTR_ERR(led_cdev->dev); |
c72a1d60 | 211 | |
270c3957 RP |
212 | #ifdef CONFIG_LEDS_TRIGGERS |
213 | init_rwsem(&led_cdev->trigger_lock); | |
214 | #endif | |
c72a1d60 | 215 | /* add to the list of leds */ |
72f8da32 | 216 | down_write(&leds_list_lock); |
c72a1d60 | 217 | list_add_tail(&led_cdev->node, &leds_list); |
72f8da32 | 218 | up_write(&leds_list_lock); |
c72a1d60 | 219 | |
1bd465e6 GL |
220 | if (!led_cdev->max_brightness) |
221 | led_cdev->max_brightness = LED_FULL; | |
222 | ||
29d76dfa HMH |
223 | led_update_brightness(led_cdev); |
224 | ||
5ada28bf JB |
225 | init_timer(&led_cdev->blink_timer); |
226 | led_cdev->blink_timer.function = led_timer_function; | |
227 | led_cdev->blink_timer.data = (unsigned long)led_cdev; | |
228 | ||
c3bc9956 | 229 | #ifdef CONFIG_LEDS_TRIGGERS |
12fda168 | 230 | led_trigger_set_default(led_cdev); |
c3bc9956 RP |
231 | #endif |
232 | ||
bb9b6ef7 | 233 | printk(KERN_DEBUG "Registered led device: %s\n", |
f8a7c6fe | 234 | led_cdev->name); |
c72a1d60 RP |
235 | |
236 | return 0; | |
237 | } | |
238 | EXPORT_SYMBOL_GPL(led_classdev_register); | |
239 | ||
240 | /** | |
0266a458 | 241 | * led_classdev_unregister - unregisters a object of led_properties class. |
70d63ccc | 242 | * @led_cdev: the led device to unregister |
c72a1d60 RP |
243 | * |
244 | * Unregisters a previously registered via led_classdev_register object. | |
245 | */ | |
b844eba2 | 246 | void led_classdev_unregister(struct led_classdev *led_cdev) |
c72a1d60 | 247 | { |
c3bc9956 | 248 | #ifdef CONFIG_LEDS_TRIGGERS |
dc47206e | 249 | down_write(&led_cdev->trigger_lock); |
c3bc9956 RP |
250 | if (led_cdev->trigger) |
251 | led_trigger_set(led_cdev, NULL); | |
dc47206e | 252 | up_write(&led_cdev->trigger_lock); |
c3bc9956 | 253 | #endif |
c72a1d60 | 254 | |
5ada28bf JB |
255 | /* Stop blinking */ |
256 | led_brightness_set(led_cdev, LED_OFF); | |
257 | ||
b844eba2 | 258 | device_unregister(led_cdev->dev); |
c72a1d60 | 259 | |
72f8da32 | 260 | down_write(&leds_list_lock); |
c72a1d60 | 261 | list_del(&led_cdev->node); |
72f8da32 | 262 | up_write(&leds_list_lock); |
c72a1d60 | 263 | } |
b844eba2 | 264 | EXPORT_SYMBOL_GPL(led_classdev_unregister); |
c72a1d60 | 265 | |
5ada28bf JB |
266 | void led_blink_set(struct led_classdev *led_cdev, |
267 | unsigned long *delay_on, | |
268 | unsigned long *delay_off) | |
269 | { | |
488bc35b AO |
270 | del_timer_sync(&led_cdev->blink_timer); |
271 | ||
5ada28bf | 272 | if (led_cdev->blink_set && |
6123b0e2 AO |
273 | !led_cdev->blink_set(led_cdev, delay_on, delay_off)) { |
274 | led_cdev->blink_delay_on = *delay_on; | |
275 | led_cdev->blink_delay_off = *delay_off; | |
5ada28bf | 276 | return; |
6123b0e2 | 277 | } |
5ada28bf JB |
278 | |
279 | /* blink with 1 Hz as default if nothing specified */ | |
280 | if (!*delay_on && !*delay_off) | |
281 | *delay_on = *delay_off = 500; | |
282 | ||
283 | led_set_software_blink(led_cdev, *delay_on, *delay_off); | |
284 | } | |
285 | EXPORT_SYMBOL(led_blink_set); | |
286 | ||
287 | void led_brightness_set(struct led_classdev *led_cdev, | |
288 | enum led_brightness brightness) | |
289 | { | |
290 | led_stop_software_blink(led_cdev); | |
291 | led_cdev->brightness_set(led_cdev, brightness); | |
292 | } | |
293 | EXPORT_SYMBOL(led_brightness_set); | |
294 | ||
c72a1d60 RP |
295 | static int __init leds_init(void) |
296 | { | |
297 | leds_class = class_create(THIS_MODULE, "leds"); | |
298 | if (IS_ERR(leds_class)) | |
299 | return PTR_ERR(leds_class); | |
859cb7f2 RP |
300 | leds_class->suspend = led_suspend; |
301 | leds_class->resume = led_resume; | |
14b5d6dd | 302 | leds_class->dev_attrs = led_class_attrs; |
c72a1d60 RP |
303 | return 0; |
304 | } | |
305 | ||
306 | static void __exit leds_exit(void) | |
307 | { | |
308 | class_destroy(leds_class); | |
309 | } | |
310 | ||
311 | subsys_initcall(leds_init); | |
312 | module_exit(leds_exit); | |
313 | ||
314 | MODULE_AUTHOR("John Lenz, Richard Purdie"); | |
315 | MODULE_LICENSE("GPL"); | |
316 | MODULE_DESCRIPTION("LED Class Interface"); |