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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 | ||
04713306 JA |
12 | #include <linux/ctype.h> |
13 | #include <linux/device.h> | |
14 | #include <linux/err.h> | |
c72a1d60 | 15 | #include <linux/init.h> |
04713306 JA |
16 | #include <linux/kernel.h> |
17 | #include <linux/leds.h> | |
c72a1d60 | 18 | #include <linux/list.h> |
04713306 JA |
19 | #include <linux/module.h> |
20 | #include <linux/slab.h> | |
c72a1d60 | 21 | #include <linux/spinlock.h> |
9067359f | 22 | #include <linux/timer.h> |
c72a1d60 RP |
23 | #include "leds.h" |
24 | ||
25 | static struct class *leds_class; | |
26 | ||
5baa7503 | 27 | static ssize_t brightness_show(struct device *dev, |
f8a7c6fe | 28 | struct device_attribute *attr, char *buf) |
c72a1d60 | 29 | { |
f8a7c6fe | 30 | struct led_classdev *led_cdev = dev_get_drvdata(dev); |
c72a1d60 RP |
31 | |
32 | /* no lock needed for this */ | |
29d76dfa | 33 | led_update_brightness(led_cdev); |
c72a1d60 | 34 | |
dd8e5a20 | 35 | return sprintf(buf, "%u\n", led_cdev->brightness); |
c72a1d60 RP |
36 | } |
37 | ||
5baa7503 | 38 | static ssize_t brightness_store(struct device *dev, |
f8a7c6fe | 39 | struct device_attribute *attr, const char *buf, size_t size) |
c72a1d60 | 40 | { |
f8a7c6fe | 41 | struct led_classdev *led_cdev = dev_get_drvdata(dev); |
872b86be | 42 | unsigned long state; |
c72a1d60 | 43 | ssize_t ret = -EINVAL; |
c72a1d60 | 44 | |
872b86be SK |
45 | ret = kstrtoul(buf, 10, &state); |
46 | if (ret) | |
47 | return ret; | |
3dc7b82e | 48 | |
872b86be SK |
49 | if (state == LED_OFF) |
50 | led_trigger_remove(led_cdev); | |
0da3e65b | 51 | __led_set_brightness(led_cdev, state); |
0013b23d | 52 | |
872b86be | 53 | return size; |
c72a1d60 | 54 | } |
5baa7503 | 55 | static DEVICE_ATTR_RW(brightness); |
c72a1d60 | 56 | |
38419612 | 57 | static ssize_t max_brightness_show(struct device *dev, |
1bd465e6 GL |
58 | struct device_attribute *attr, char *buf) |
59 | { | |
60 | struct led_classdev *led_cdev = dev_get_drvdata(dev); | |
61 | ||
62 | return sprintf(buf, "%u\n", led_cdev->max_brightness); | |
63 | } | |
38419612 | 64 | static DEVICE_ATTR_RO(max_brightness); |
1bd465e6 | 65 | |
c3bc9956 | 66 | #ifdef CONFIG_LEDS_TRIGGERS |
5baa7503 GKH |
67 | static DEVICE_ATTR(trigger, 0644, led_trigger_show, led_trigger_store); |
68 | static struct attribute *led_trigger_attrs[] = { | |
69 | &dev_attr_trigger.attr, | |
70 | NULL, | |
71 | }; | |
72 | static const struct attribute_group led_trigger_group = { | |
73 | .attrs = led_trigger_attrs, | |
74 | }; | |
75 | #endif | |
76 | ||
77 | static struct attribute *led_class_attrs[] = { | |
78 | &dev_attr_brightness.attr, | |
79 | &dev_attr_max_brightness.attr, | |
80 | NULL, | |
81 | }; | |
82 | ||
83 | static const struct attribute_group led_group = { | |
84 | .attrs = led_class_attrs, | |
85 | }; | |
86 | ||
87 | static const struct attribute_group *led_groups[] = { | |
88 | &led_group, | |
89 | #ifdef CONFIG_LEDS_TRIGGERS | |
90 | &led_trigger_group, | |
c3bc9956 | 91 | #endif |
5baa7503 | 92 | NULL, |
14b5d6dd | 93 | }; |
c72a1d60 | 94 | |
9067359f | 95 | static void led_timer_function(unsigned long data) |
5ada28bf | 96 | { |
9067359f | 97 | struct led_classdev *led_cdev = (void *)data; |
5ada28bf JB |
98 | unsigned long brightness; |
99 | unsigned long delay; | |
100 | ||
101 | if (!led_cdev->blink_delay_on || !led_cdev->blink_delay_off) { | |
0da3e65b | 102 | __led_set_brightness(led_cdev, LED_OFF); |
5ada28bf JB |
103 | return; |
104 | } | |
105 | ||
5bb629c5 FB |
106 | if (led_cdev->flags & LED_BLINK_ONESHOT_STOP) { |
107 | led_cdev->flags &= ~LED_BLINK_ONESHOT_STOP; | |
108 | return; | |
109 | } | |
110 | ||
5ada28bf JB |
111 | brightness = led_get_brightness(led_cdev); |
112 | if (!brightness) { | |
113 | /* Time to switch the LED on. */ | |
114 | brightness = led_cdev->blink_brightness; | |
115 | delay = led_cdev->blink_delay_on; | |
116 | } else { | |
117 | /* Store the current brightness value to be able | |
118 | * to restore it when the delay_off period is over. | |
119 | */ | |
120 | led_cdev->blink_brightness = brightness; | |
121 | brightness = LED_OFF; | |
122 | delay = led_cdev->blink_delay_off; | |
123 | } | |
124 | ||
0da3e65b | 125 | __led_set_brightness(led_cdev, brightness); |
5ada28bf | 126 | |
5bb629c5 FB |
127 | /* Return in next iteration if led is in one-shot mode and we are in |
128 | * the final blink state so that the led is toggled each delay_on + | |
129 | * delay_off milliseconds in worst case. | |
130 | */ | |
131 | if (led_cdev->flags & LED_BLINK_ONESHOT) { | |
132 | if (led_cdev->flags & LED_BLINK_INVERT) { | |
133 | if (brightness) | |
134 | led_cdev->flags |= LED_BLINK_ONESHOT_STOP; | |
135 | } else { | |
136 | if (!brightness) | |
137 | led_cdev->flags |= LED_BLINK_ONESHOT_STOP; | |
138 | } | |
139 | } | |
140 | ||
9067359f | 141 | mod_timer(&led_cdev->blink_timer, jiffies + msecs_to_jiffies(delay)); |
5ada28bf JB |
142 | } |
143 | ||
d23a22a7 FB |
144 | static void set_brightness_delayed(struct work_struct *ws) |
145 | { | |
146 | struct led_classdev *led_cdev = | |
147 | container_of(ws, struct led_classdev, set_brightness_work); | |
148 | ||
149 | led_stop_software_blink(led_cdev); | |
150 | ||
151 | __led_set_brightness(led_cdev, led_cdev->delayed_set_value); | |
152 | } | |
153 | ||
c72a1d60 RP |
154 | /** |
155 | * led_classdev_suspend - suspend an led_classdev. | |
156 | * @led_cdev: the led_classdev to suspend. | |
157 | */ | |
158 | void led_classdev_suspend(struct led_classdev *led_cdev) | |
159 | { | |
160 | led_cdev->flags |= LED_SUSPENDED; | |
161 | led_cdev->brightness_set(led_cdev, 0); | |
162 | } | |
163 | EXPORT_SYMBOL_GPL(led_classdev_suspend); | |
164 | ||
165 | /** | |
166 | * led_classdev_resume - resume an led_classdev. | |
167 | * @led_cdev: the led_classdev to resume. | |
168 | */ | |
169 | void led_classdev_resume(struct led_classdev *led_cdev) | |
170 | { | |
171 | led_cdev->brightness_set(led_cdev, led_cdev->brightness); | |
172 | led_cdev->flags &= ~LED_SUSPENDED; | |
173 | } | |
174 | EXPORT_SYMBOL_GPL(led_classdev_resume); | |
175 | ||
73e1ab41 | 176 | static int led_suspend(struct device *dev) |
859cb7f2 RP |
177 | { |
178 | struct led_classdev *led_cdev = dev_get_drvdata(dev); | |
179 | ||
180 | if (led_cdev->flags & LED_CORE_SUSPENDRESUME) | |
181 | led_classdev_suspend(led_cdev); | |
182 | ||
183 | return 0; | |
184 | } | |
185 | ||
186 | static int led_resume(struct device *dev) | |
187 | { | |
188 | struct led_classdev *led_cdev = dev_get_drvdata(dev); | |
189 | ||
190 | if (led_cdev->flags & LED_CORE_SUSPENDRESUME) | |
191 | led_classdev_resume(led_cdev); | |
192 | ||
193 | return 0; | |
194 | } | |
195 | ||
73e1ab41 SK |
196 | static const struct dev_pm_ops leds_class_dev_pm_ops = { |
197 | .suspend = led_suspend, | |
198 | .resume = led_resume, | |
199 | }; | |
200 | ||
c72a1d60 RP |
201 | /** |
202 | * led_classdev_register - register a new object of led_classdev class. | |
ff8649af | 203 | * @parent: The device to register. |
c72a1d60 RP |
204 | * @led_cdev: the led_classdev structure for this device. |
205 | */ | |
206 | int led_classdev_register(struct device *parent, struct led_classdev *led_cdev) | |
207 | { | |
d0d480cc JH |
208 | led_cdev->dev = device_create_with_groups(leds_class, parent, 0, |
209 | led_cdev, led_cdev->groups, | |
210 | "%s", led_cdev->name); | |
801678c5 | 211 | if (IS_ERR(led_cdev->dev)) |
f8a7c6fe | 212 | return PTR_ERR(led_cdev->dev); |
c72a1d60 | 213 | |
270c3957 RP |
214 | #ifdef CONFIG_LEDS_TRIGGERS |
215 | init_rwsem(&led_cdev->trigger_lock); | |
216 | #endif | |
c72a1d60 | 217 | /* add to the list of leds */ |
72f8da32 | 218 | down_write(&leds_list_lock); |
c72a1d60 | 219 | list_add_tail(&led_cdev->node, &leds_list); |
72f8da32 | 220 | up_write(&leds_list_lock); |
c72a1d60 | 221 | |
1bd465e6 GL |
222 | if (!led_cdev->max_brightness) |
223 | led_cdev->max_brightness = LED_FULL; | |
224 | ||
29d76dfa HMH |
225 | led_update_brightness(led_cdev); |
226 | ||
d23a22a7 FB |
227 | INIT_WORK(&led_cdev->set_brightness_work, set_brightness_delayed); |
228 | ||
9067359f JK |
229 | init_timer(&led_cdev->blink_timer); |
230 | led_cdev->blink_timer.function = led_timer_function; | |
231 | led_cdev->blink_timer.data = (unsigned long)led_cdev; | |
5ada28bf | 232 | |
c3bc9956 | 233 | #ifdef CONFIG_LEDS_TRIGGERS |
12fda168 | 234 | led_trigger_set_default(led_cdev); |
c3bc9956 RP |
235 | #endif |
236 | ||
d23e7b8b | 237 | dev_dbg(parent, "Registered led device: %s\n", |
f8a7c6fe | 238 | led_cdev->name); |
c72a1d60 RP |
239 | |
240 | return 0; | |
241 | } | |
242 | EXPORT_SYMBOL_GPL(led_classdev_register); | |
243 | ||
244 | /** | |
0266a458 | 245 | * led_classdev_unregister - unregisters a object of led_properties class. |
70d63ccc | 246 | * @led_cdev: the led device to unregister |
c72a1d60 RP |
247 | * |
248 | * Unregisters a previously registered via led_classdev_register object. | |
249 | */ | |
b844eba2 | 250 | void led_classdev_unregister(struct led_classdev *led_cdev) |
c72a1d60 | 251 | { |
c3bc9956 | 252 | #ifdef CONFIG_LEDS_TRIGGERS |
dc47206e | 253 | down_write(&led_cdev->trigger_lock); |
c3bc9956 RP |
254 | if (led_cdev->trigger) |
255 | led_trigger_set(led_cdev, NULL); | |
dc47206e | 256 | up_write(&led_cdev->trigger_lock); |
c3bc9956 | 257 | #endif |
c72a1d60 | 258 | |
d23a22a7 FB |
259 | cancel_work_sync(&led_cdev->set_brightness_work); |
260 | ||
5ada28bf | 261 | /* Stop blinking */ |
d23a22a7 | 262 | led_stop_software_blink(led_cdev); |
19cd67e2 | 263 | led_set_brightness(led_cdev, LED_OFF); |
5ada28bf | 264 | |
b844eba2 | 265 | device_unregister(led_cdev->dev); |
c72a1d60 | 266 | |
72f8da32 | 267 | down_write(&leds_list_lock); |
c72a1d60 | 268 | list_del(&led_cdev->node); |
72f8da32 | 269 | up_write(&leds_list_lock); |
c72a1d60 | 270 | } |
b844eba2 | 271 | EXPORT_SYMBOL_GPL(led_classdev_unregister); |
c72a1d60 RP |
272 | |
273 | static int __init leds_init(void) | |
274 | { | |
275 | leds_class = class_create(THIS_MODULE, "leds"); | |
276 | if (IS_ERR(leds_class)) | |
277 | return PTR_ERR(leds_class); | |
73e1ab41 | 278 | leds_class->pm = &leds_class_dev_pm_ops; |
5baa7503 | 279 | leds_class->dev_groups = led_groups; |
c72a1d60 RP |
280 | return 0; |
281 | } | |
282 | ||
283 | static void __exit leds_exit(void) | |
284 | { | |
285 | class_destroy(leds_class); | |
286 | } | |
287 | ||
288 | subsys_initcall(leds_init); | |
289 | module_exit(leds_exit); | |
290 | ||
291 | MODULE_AUTHOR("John Lenz, Richard Purdie"); | |
292 | MODULE_LICENSE("GPL"); | |
293 | MODULE_DESCRIPTION("LED Class Interface"); |