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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> | |
c72a1d60 RP |
18 | #include <linux/timer.h> |
19 | #include <linux/err.h> | |
3dc7b82e | 20 | #include <linux/ctype.h> |
c72a1d60 RP |
21 | #include <linux/leds.h> |
22 | #include "leds.h" | |
23 | ||
24 | static struct class *leds_class; | |
25 | ||
29d76dfa HMH |
26 | static void led_update_brightness(struct led_classdev *led_cdev) |
27 | { | |
28 | if (led_cdev->brightness_get) | |
29 | led_cdev->brightness = led_cdev->brightness_get(led_cdev); | |
30 | } | |
31 | ||
5baa7503 | 32 | static ssize_t brightness_show(struct device *dev, |
f8a7c6fe | 33 | struct device_attribute *attr, char *buf) |
c72a1d60 | 34 | { |
f8a7c6fe | 35 | struct led_classdev *led_cdev = dev_get_drvdata(dev); |
c72a1d60 RP |
36 | |
37 | /* no lock needed for this */ | |
29d76dfa | 38 | led_update_brightness(led_cdev); |
c72a1d60 | 39 | |
dd8e5a20 | 40 | return sprintf(buf, "%u\n", led_cdev->brightness); |
c72a1d60 RP |
41 | } |
42 | ||
5baa7503 | 43 | static ssize_t brightness_store(struct device *dev, |
f8a7c6fe | 44 | struct device_attribute *attr, const char *buf, size_t size) |
c72a1d60 | 45 | { |
f8a7c6fe | 46 | struct led_classdev *led_cdev = dev_get_drvdata(dev); |
872b86be | 47 | unsigned long state; |
c72a1d60 | 48 | ssize_t ret = -EINVAL; |
c72a1d60 | 49 | |
872b86be SK |
50 | ret = kstrtoul(buf, 10, &state); |
51 | if (ret) | |
52 | return ret; | |
3dc7b82e | 53 | |
872b86be SK |
54 | if (state == LED_OFF) |
55 | led_trigger_remove(led_cdev); | |
0da3e65b | 56 | __led_set_brightness(led_cdev, state); |
0013b23d | 57 | |
872b86be | 58 | return size; |
c72a1d60 | 59 | } |
5baa7503 | 60 | static DEVICE_ATTR_RW(brightness); |
c72a1d60 | 61 | |
1bd465e6 GL |
62 | static ssize_t led_max_brightness_show(struct device *dev, |
63 | struct device_attribute *attr, char *buf) | |
64 | { | |
65 | struct led_classdev *led_cdev = dev_get_drvdata(dev); | |
66 | ||
67 | return sprintf(buf, "%u\n", led_cdev->max_brightness); | |
68 | } | |
5baa7503 | 69 | static DEVICE_ATTR(max_brightness, 0444, led_max_brightness_show, NULL); |
1bd465e6 | 70 | |
c3bc9956 | 71 | #ifdef CONFIG_LEDS_TRIGGERS |
5baa7503 GKH |
72 | static DEVICE_ATTR(trigger, 0644, led_trigger_show, led_trigger_store); |
73 | static struct attribute *led_trigger_attrs[] = { | |
74 | &dev_attr_trigger.attr, | |
75 | NULL, | |
76 | }; | |
77 | static const struct attribute_group led_trigger_group = { | |
78 | .attrs = led_trigger_attrs, | |
79 | }; | |
80 | #endif | |
81 | ||
82 | static struct attribute *led_class_attrs[] = { | |
83 | &dev_attr_brightness.attr, | |
84 | &dev_attr_max_brightness.attr, | |
85 | NULL, | |
86 | }; | |
87 | ||
88 | static const struct attribute_group led_group = { | |
89 | .attrs = led_class_attrs, | |
90 | }; | |
91 | ||
92 | static const struct attribute_group *led_groups[] = { | |
93 | &led_group, | |
94 | #ifdef CONFIG_LEDS_TRIGGERS | |
95 | &led_trigger_group, | |
c3bc9956 | 96 | #endif |
5baa7503 | 97 | NULL, |
14b5d6dd | 98 | }; |
c72a1d60 | 99 | |
5ada28bf JB |
100 | static void led_timer_function(unsigned long data) |
101 | { | |
102 | struct led_classdev *led_cdev = (void *)data; | |
103 | unsigned long brightness; | |
104 | unsigned long delay; | |
105 | ||
106 | if (!led_cdev->blink_delay_on || !led_cdev->blink_delay_off) { | |
0da3e65b | 107 | __led_set_brightness(led_cdev, LED_OFF); |
5ada28bf JB |
108 | return; |
109 | } | |
110 | ||
5bb629c5 FB |
111 | if (led_cdev->flags & LED_BLINK_ONESHOT_STOP) { |
112 | led_cdev->flags &= ~LED_BLINK_ONESHOT_STOP; | |
113 | return; | |
114 | } | |
115 | ||
5ada28bf JB |
116 | brightness = led_get_brightness(led_cdev); |
117 | if (!brightness) { | |
118 | /* Time to switch the LED on. */ | |
119 | brightness = led_cdev->blink_brightness; | |
120 | delay = led_cdev->blink_delay_on; | |
121 | } else { | |
122 | /* Store the current brightness value to be able | |
123 | * to restore it when the delay_off period is over. | |
124 | */ | |
125 | led_cdev->blink_brightness = brightness; | |
126 | brightness = LED_OFF; | |
127 | delay = led_cdev->blink_delay_off; | |
128 | } | |
129 | ||
0da3e65b | 130 | __led_set_brightness(led_cdev, brightness); |
5ada28bf | 131 | |
5bb629c5 FB |
132 | /* Return in next iteration if led is in one-shot mode and we are in |
133 | * the final blink state so that the led is toggled each delay_on + | |
134 | * delay_off milliseconds in worst case. | |
135 | */ | |
136 | if (led_cdev->flags & LED_BLINK_ONESHOT) { | |
137 | if (led_cdev->flags & LED_BLINK_INVERT) { | |
138 | if (brightness) | |
139 | led_cdev->flags |= LED_BLINK_ONESHOT_STOP; | |
140 | } else { | |
141 | if (!brightness) | |
142 | led_cdev->flags |= LED_BLINK_ONESHOT_STOP; | |
143 | } | |
144 | } | |
145 | ||
5ada28bf JB |
146 | mod_timer(&led_cdev->blink_timer, jiffies + msecs_to_jiffies(delay)); |
147 | } | |
148 | ||
d23a22a7 FB |
149 | static void set_brightness_delayed(struct work_struct *ws) |
150 | { | |
151 | struct led_classdev *led_cdev = | |
152 | container_of(ws, struct led_classdev, set_brightness_work); | |
153 | ||
154 | led_stop_software_blink(led_cdev); | |
155 | ||
156 | __led_set_brightness(led_cdev, led_cdev->delayed_set_value); | |
157 | } | |
158 | ||
c72a1d60 RP |
159 | /** |
160 | * led_classdev_suspend - suspend an led_classdev. | |
161 | * @led_cdev: the led_classdev to suspend. | |
162 | */ | |
163 | void led_classdev_suspend(struct led_classdev *led_cdev) | |
164 | { | |
165 | led_cdev->flags |= LED_SUSPENDED; | |
166 | led_cdev->brightness_set(led_cdev, 0); | |
167 | } | |
168 | EXPORT_SYMBOL_GPL(led_classdev_suspend); | |
169 | ||
170 | /** | |
171 | * led_classdev_resume - resume an led_classdev. | |
172 | * @led_cdev: the led_classdev to resume. | |
173 | */ | |
174 | void led_classdev_resume(struct led_classdev *led_cdev) | |
175 | { | |
176 | led_cdev->brightness_set(led_cdev, led_cdev->brightness); | |
177 | led_cdev->flags &= ~LED_SUSPENDED; | |
178 | } | |
179 | EXPORT_SYMBOL_GPL(led_classdev_resume); | |
180 | ||
73e1ab41 | 181 | static int led_suspend(struct device *dev) |
859cb7f2 RP |
182 | { |
183 | struct led_classdev *led_cdev = dev_get_drvdata(dev); | |
184 | ||
185 | if (led_cdev->flags & LED_CORE_SUSPENDRESUME) | |
186 | led_classdev_suspend(led_cdev); | |
187 | ||
188 | return 0; | |
189 | } | |
190 | ||
191 | static int led_resume(struct device *dev) | |
192 | { | |
193 | struct led_classdev *led_cdev = dev_get_drvdata(dev); | |
194 | ||
195 | if (led_cdev->flags & LED_CORE_SUSPENDRESUME) | |
196 | led_classdev_resume(led_cdev); | |
197 | ||
198 | return 0; | |
199 | } | |
200 | ||
73e1ab41 SK |
201 | static const struct dev_pm_ops leds_class_dev_pm_ops = { |
202 | .suspend = led_suspend, | |
203 | .resume = led_resume, | |
204 | }; | |
205 | ||
c72a1d60 RP |
206 | /** |
207 | * led_classdev_register - register a new object of led_classdev class. | |
ff8649af | 208 | * @parent: The device to register. |
c72a1d60 RP |
209 | * @led_cdev: the led_classdev structure for this device. |
210 | */ | |
211 | int led_classdev_register(struct device *parent, struct led_classdev *led_cdev) | |
212 | { | |
a9b12619 GKH |
213 | led_cdev->dev = device_create(leds_class, parent, 0, led_cdev, |
214 | "%s", led_cdev->name); | |
801678c5 | 215 | if (IS_ERR(led_cdev->dev)) |
f8a7c6fe | 216 | return PTR_ERR(led_cdev->dev); |
c72a1d60 | 217 | |
270c3957 RP |
218 | #ifdef CONFIG_LEDS_TRIGGERS |
219 | init_rwsem(&led_cdev->trigger_lock); | |
220 | #endif | |
c72a1d60 | 221 | /* add to the list of leds */ |
72f8da32 | 222 | down_write(&leds_list_lock); |
c72a1d60 | 223 | list_add_tail(&led_cdev->node, &leds_list); |
72f8da32 | 224 | up_write(&leds_list_lock); |
c72a1d60 | 225 | |
1bd465e6 GL |
226 | if (!led_cdev->max_brightness) |
227 | led_cdev->max_brightness = LED_FULL; | |
228 | ||
29d76dfa HMH |
229 | led_update_brightness(led_cdev); |
230 | ||
d23a22a7 FB |
231 | INIT_WORK(&led_cdev->set_brightness_work, set_brightness_delayed); |
232 | ||
5ada28bf JB |
233 | init_timer(&led_cdev->blink_timer); |
234 | led_cdev->blink_timer.function = led_timer_function; | |
235 | led_cdev->blink_timer.data = (unsigned long)led_cdev; | |
236 | ||
c3bc9956 | 237 | #ifdef CONFIG_LEDS_TRIGGERS |
12fda168 | 238 | led_trigger_set_default(led_cdev); |
c3bc9956 RP |
239 | #endif |
240 | ||
d23e7b8b | 241 | dev_dbg(parent, "Registered led device: %s\n", |
f8a7c6fe | 242 | led_cdev->name); |
c72a1d60 RP |
243 | |
244 | return 0; | |
245 | } | |
246 | EXPORT_SYMBOL_GPL(led_classdev_register); | |
247 | ||
248 | /** | |
0266a458 | 249 | * led_classdev_unregister - unregisters a object of led_properties class. |
70d63ccc | 250 | * @led_cdev: the led device to unregister |
c72a1d60 RP |
251 | * |
252 | * Unregisters a previously registered via led_classdev_register object. | |
253 | */ | |
b844eba2 | 254 | void led_classdev_unregister(struct led_classdev *led_cdev) |
c72a1d60 | 255 | { |
c3bc9956 | 256 | #ifdef CONFIG_LEDS_TRIGGERS |
dc47206e | 257 | down_write(&led_cdev->trigger_lock); |
c3bc9956 RP |
258 | if (led_cdev->trigger) |
259 | led_trigger_set(led_cdev, NULL); | |
dc47206e | 260 | up_write(&led_cdev->trigger_lock); |
c3bc9956 | 261 | #endif |
c72a1d60 | 262 | |
d23a22a7 FB |
263 | cancel_work_sync(&led_cdev->set_brightness_work); |
264 | ||
5ada28bf | 265 | /* Stop blinking */ |
d23a22a7 | 266 | led_stop_software_blink(led_cdev); |
19cd67e2 | 267 | led_set_brightness(led_cdev, LED_OFF); |
5ada28bf | 268 | |
b844eba2 | 269 | device_unregister(led_cdev->dev); |
c72a1d60 | 270 | |
72f8da32 | 271 | down_write(&leds_list_lock); |
c72a1d60 | 272 | list_del(&led_cdev->node); |
72f8da32 | 273 | up_write(&leds_list_lock); |
c72a1d60 | 274 | } |
b844eba2 | 275 | EXPORT_SYMBOL_GPL(led_classdev_unregister); |
c72a1d60 RP |
276 | |
277 | static int __init leds_init(void) | |
278 | { | |
279 | leds_class = class_create(THIS_MODULE, "leds"); | |
280 | if (IS_ERR(leds_class)) | |
281 | return PTR_ERR(leds_class); | |
73e1ab41 | 282 | leds_class->pm = &leds_class_dev_pm_ops; |
5baa7503 | 283 | leds_class->dev_groups = led_groups; |
c72a1d60 RP |
284 | return 0; |
285 | } | |
286 | ||
287 | static void __exit leds_exit(void) | |
288 | { | |
289 | class_destroy(leds_class); | |
290 | } | |
291 | ||
292 | subsys_initcall(leds_init); | |
293 | module_exit(leds_exit); | |
294 | ||
295 | MODULE_AUTHOR("John Lenz, Richard Purdie"); | |
296 | MODULE_LICENSE("GPL"); | |
297 | MODULE_DESCRIPTION("LED Class Interface"); |