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1 | /* |
2 | * LED Class Core |
3 | * |
4 | * Copyright (C) 2005 John Lenz <lenz@cs.wisc.edu> |
5 | * Copyright (C) 2005-2007 Richard Purdie <rpurdie@openedhand.com> |
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 | |
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/timer.h> |
19 | #include <linux/err.h> |
20 | #include <linux/ctype.h> |
21 | #include <linux/leds.h> |
22 | #include "leds.h" |
23 | |
24 | static struct class *leds_class; |
25 | |
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 | |
32 | static ssize_t led_brightness_show(struct device *dev, |
33 | struct device_attribute *attr, char *buf) |
34 | { |
35 | struct led_classdev *led_cdev = dev_get_drvdata(dev); |
36 | |
37 | /* no lock needed for this */ |
38 | led_update_brightness(led_cdev); |
39 | |
40 | return sprintf(buf, "%u\n", led_cdev->brightness); |
41 | } |
42 | |
43 | static ssize_t led_brightness_store(struct device *dev, |
44 | struct device_attribute *attr, const char *buf, size_t size) |
45 | { |
46 | struct led_classdev *led_cdev = dev_get_drvdata(dev); |
47 | unsigned long state; |
48 | ssize_t ret = -EINVAL; |
49 | |
50 | ret = kstrtoul(buf, 10, &state); |
51 | if (ret) |
52 | return ret; |
53 | |
54 | if (state == LED_OFF) |
55 | led_trigger_remove(led_cdev); |
56 | __led_set_brightness(led_cdev, state); |
57 | |
58 | return size; |
59 | } |
60 | |
61 | static ssize_t led_max_brightness_show(struct device *dev, |
62 | struct device_attribute *attr, char *buf) |
63 | { |
64 | struct led_classdev *led_cdev = dev_get_drvdata(dev); |
65 | |
66 | return sprintf(buf, "%u\n", led_cdev->max_brightness); |
67 | } |
68 | |
69 | static struct device_attribute led_class_attrs[] = { |
70 | __ATTR(brightness, 0644, led_brightness_show, led_brightness_store), |
71 | __ATTR(max_brightness, 0444, led_max_brightness_show, NULL), |
72 | #ifdef CONFIG_LEDS_TRIGGERS |
73 | __ATTR(trigger, 0644, led_trigger_show, led_trigger_store), |
74 | #endif |
75 | __ATTR_NULL, |
76 | }; |
77 | |
78 | static void led_timer_function(unsigned long data) |
79 | { |
80 | struct led_classdev *led_cdev = (void *)data; |
81 | unsigned long brightness; |
82 | unsigned long delay; |
83 | |
84 | if (!led_cdev->blink_delay_on || !led_cdev->blink_delay_off) { |
85 | __led_set_brightness(led_cdev, LED_OFF); |
86 | return; |
87 | } |
88 | |
89 | if (led_cdev->flags & LED_BLINK_ONESHOT_STOP) { |
90 | led_cdev->flags &= ~LED_BLINK_ONESHOT_STOP; |
91 | return; |
92 | } |
93 | |
94 | brightness = led_get_brightness(led_cdev); |
95 | if (!brightness) { |
96 | /* Time to switch the LED on. */ |
97 | brightness = led_cdev->blink_brightness; |
98 | delay = led_cdev->blink_delay_on; |
99 | } else { |
100 | /* Store the current brightness value to be able |
101 | * to restore it when the delay_off period is over. |
102 | */ |
103 | led_cdev->blink_brightness = brightness; |
104 | brightness = LED_OFF; |
105 | delay = led_cdev->blink_delay_off; |
106 | } |
107 | |
108 | __led_set_brightness(led_cdev, brightness); |
109 | |
110 | /* Return in next iteration if led is in one-shot mode and we are in |
111 | * the final blink state so that the led is toggled each delay_on + |
112 | * delay_off milliseconds in worst case. |
113 | */ |
114 | if (led_cdev->flags & LED_BLINK_ONESHOT) { |
115 | if (led_cdev->flags & LED_BLINK_INVERT) { |
116 | if (brightness) |
117 | led_cdev->flags |= LED_BLINK_ONESHOT_STOP; |
118 | } else { |
119 | if (!brightness) |
120 | led_cdev->flags |= LED_BLINK_ONESHOT_STOP; |
121 | } |
122 | } |
123 | |
124 | mod_timer(&led_cdev->blink_timer, jiffies + msecs_to_jiffies(delay)); |
125 | } |
126 | |
127 | static void set_brightness_delayed(struct work_struct *ws) |
128 | { |
129 | struct led_classdev *led_cdev = |
130 | container_of(ws, struct led_classdev, set_brightness_work); |
131 | |
132 | led_stop_software_blink(led_cdev); |
133 | |
134 | __led_set_brightness(led_cdev, led_cdev->delayed_set_value); |
135 | } |
136 | |
137 | /** |
138 | * led_classdev_suspend - suspend an led_classdev. |
139 | * @led_cdev: the led_classdev to suspend. |
140 | */ |
141 | void led_classdev_suspend(struct led_classdev *led_cdev) |
142 | { |
143 | led_cdev->flags |= LED_SUSPENDED; |
144 | led_cdev->brightness_set(led_cdev, 0); |
145 | } |
146 | EXPORT_SYMBOL_GPL(led_classdev_suspend); |
147 | |
148 | /** |
149 | * led_classdev_resume - resume an led_classdev. |
150 | * @led_cdev: the led_classdev to resume. |
151 | */ |
152 | void led_classdev_resume(struct led_classdev *led_cdev) |
153 | { |
154 | led_cdev->brightness_set(led_cdev, led_cdev->brightness); |
155 | led_cdev->flags &= ~LED_SUSPENDED; |
156 | } |
157 | EXPORT_SYMBOL_GPL(led_classdev_resume); |
158 | |
159 | static int led_suspend(struct device *dev, pm_message_t state) |
160 | { |
161 | struct led_classdev *led_cdev = dev_get_drvdata(dev); |
162 | |
163 | if (led_cdev->flags & LED_CORE_SUSPENDRESUME) |
164 | led_classdev_suspend(led_cdev); |
165 | |
166 | return 0; |
167 | } |
168 | |
169 | static int led_resume(struct device *dev) |
170 | { |
171 | struct led_classdev *led_cdev = dev_get_drvdata(dev); |
172 | |
173 | if (led_cdev->flags & LED_CORE_SUSPENDRESUME) |
174 | led_classdev_resume(led_cdev); |
175 | |
176 | return 0; |
177 | } |
178 | |
179 | /** |
180 | * led_classdev_register - register a new object of led_classdev class. |
181 | * @parent: The device to register. |
182 | * @led_cdev: the led_classdev structure for this device. |
183 | */ |
184 | int led_classdev_register(struct device *parent, struct led_classdev *led_cdev) |
185 | { |
186 | led_cdev->dev = device_create(leds_class, parent, 0, led_cdev, |
187 | "%s", led_cdev->name); |
188 | if (IS_ERR(led_cdev->dev)) |
189 | return PTR_ERR(led_cdev->dev); |
190 | |
191 | #ifdef CONFIG_LEDS_TRIGGERS |
192 | init_rwsem(&led_cdev->trigger_lock); |
193 | #endif |
194 | /* add to the list of leds */ |
195 | down_write(&leds_list_lock); |
196 | list_add_tail(&led_cdev->node, &leds_list); |
197 | up_write(&leds_list_lock); |
198 | |
199 | if (!led_cdev->max_brightness) |
200 | led_cdev->max_brightness = LED_FULL; |
201 | |
202 | led_update_brightness(led_cdev); |
203 | |
204 | INIT_WORK(&led_cdev->set_brightness_work, set_brightness_delayed); |
205 | |
206 | init_timer(&led_cdev->blink_timer); |
207 | led_cdev->blink_timer.function = led_timer_function; |
208 | led_cdev->blink_timer.data = (unsigned long)led_cdev; |
209 | |
210 | #ifdef CONFIG_LEDS_TRIGGERS |
211 | led_trigger_set_default(led_cdev); |
212 | #endif |
213 | |
214 | dev_dbg(parent, "Registered led device: %s\n", |
215 | led_cdev->name); |
216 | |
217 | return 0; |
218 | } |
219 | EXPORT_SYMBOL_GPL(led_classdev_register); |
220 | |
221 | /** |
222 | * led_classdev_unregister - unregisters a object of led_properties class. |
223 | * @led_cdev: the led device to unregister |
224 | * |
225 | * Unregisters a previously registered via led_classdev_register object. |
226 | */ |
227 | void led_classdev_unregister(struct led_classdev *led_cdev) |
228 | { |
229 | #ifdef CONFIG_LEDS_TRIGGERS |
230 | down_write(&led_cdev->trigger_lock); |
231 | if (led_cdev->trigger) |
232 | led_trigger_set(led_cdev, NULL); |
233 | up_write(&led_cdev->trigger_lock); |
234 | #endif |
235 | |
236 | cancel_work_sync(&led_cdev->set_brightness_work); |
237 | |
238 | /* Stop blinking */ |
239 | led_stop_software_blink(led_cdev); |
240 | led_set_brightness(led_cdev, LED_OFF); |
241 | |
242 | device_unregister(led_cdev->dev); |
243 | |
244 | down_write(&leds_list_lock); |
245 | list_del(&led_cdev->node); |
246 | up_write(&leds_list_lock); |
247 | } |
248 | EXPORT_SYMBOL_GPL(led_classdev_unregister); |
249 | |
250 | static int __init leds_init(void) |
251 | { |
252 | leds_class = class_create(THIS_MODULE, "leds"); |
253 | if (IS_ERR(leds_class)) |
254 | return PTR_ERR(leds_class); |
255 | leds_class->suspend = led_suspend; |
256 | leds_class->resume = led_resume; |
257 | leds_class->dev_attrs = led_class_attrs; |
258 | return 0; |
259 | } |
260 | |
261 | static void __exit leds_exit(void) |
262 | { |
263 | class_destroy(leds_class); |
264 | } |
265 | |
266 | subsys_initcall(leds_init); |
267 | module_exit(leds_exit); |
268 | |
269 | MODULE_AUTHOR("John Lenz, Richard Purdie"); |
270 | MODULE_LICENSE("GPL"); |
271 | MODULE_DESCRIPTION("LED Class Interface"); |
272 |
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