4 * Copyright (C) 2005 John Lenz <lenz@cs.wisc.edu>
5 * Copyright (C) 2005-2007 Richard Purdie <rpurdie@openedhand.com>
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.
12 #include <linux/ctype.h>
13 #include <linux/device.h>
14 #include <linux/err.h>
15 #include <linux/init.h>
16 #include <linux/kernel.h>
17 #include <linux/leds.h>
18 #include <linux/list.h>
19 #include <linux/module.h>
20 #include <linux/slab.h>
21 #include <linux/spinlock.h>
22 #include <linux/timer.h>
23 #include <uapi/linux/uleds.h>
26 static struct class *leds_class
;
28 static ssize_t
brightness_show(struct device
*dev
,
29 struct device_attribute
*attr
, char *buf
)
31 struct led_classdev
*led_cdev
= dev_get_drvdata(dev
);
33 /* no lock needed for this */
34 led_update_brightness(led_cdev
);
36 return sprintf(buf
, "%u\n", led_cdev
->brightness
);
39 static ssize_t
brightness_store(struct device
*dev
,
40 struct device_attribute
*attr
, const char *buf
, size_t size
)
42 struct led_classdev
*led_cdev
= dev_get_drvdata(dev
);
46 mutex_lock(&led_cdev
->led_access
);
48 if (led_sysfs_is_disabled(led_cdev
)) {
53 ret
= kstrtoul(buf
, 10, &state
);
58 led_trigger_remove(led_cdev
);
59 led_set_brightness(led_cdev
, state
);
63 mutex_unlock(&led_cdev
->led_access
);
66 static DEVICE_ATTR_RW(brightness
);
68 static ssize_t
max_brightness_show(struct device
*dev
,
69 struct device_attribute
*attr
, char *buf
)
71 struct led_classdev
*led_cdev
= dev_get_drvdata(dev
);
73 return sprintf(buf
, "%u\n", led_cdev
->max_brightness
);
75 static DEVICE_ATTR_RO(max_brightness
);
77 #ifdef CONFIG_LEDS_TRIGGERS
78 static DEVICE_ATTR(trigger
, 0644, led_trigger_show
, led_trigger_store
);
79 static struct attribute
*led_trigger_attrs
[] = {
80 &dev_attr_trigger
.attr
,
83 static const struct attribute_group led_trigger_group
= {
84 .attrs
= led_trigger_attrs
,
88 static struct attribute
*led_class_attrs
[] = {
89 &dev_attr_brightness
.attr
,
90 &dev_attr_max_brightness
.attr
,
94 static const struct attribute_group led_group
= {
95 .attrs
= led_class_attrs
,
98 static const struct attribute_group
*led_groups
[] = {
100 #ifdef CONFIG_LEDS_TRIGGERS
107 * led_classdev_suspend - suspend an led_classdev.
108 * @led_cdev: the led_classdev to suspend.
110 void led_classdev_suspend(struct led_classdev
*led_cdev
)
112 led_cdev
->flags
|= LED_SUSPENDED
;
113 led_set_brightness_nopm(led_cdev
, 0);
115 EXPORT_SYMBOL_GPL(led_classdev_suspend
);
118 * led_classdev_resume - resume an led_classdev.
119 * @led_cdev: the led_classdev to resume.
121 void led_classdev_resume(struct led_classdev
*led_cdev
)
123 led_set_brightness_nopm(led_cdev
, led_cdev
->brightness
);
125 if (led_cdev
->flash_resume
)
126 led_cdev
->flash_resume(led_cdev
);
128 led_cdev
->flags
&= ~LED_SUSPENDED
;
130 EXPORT_SYMBOL_GPL(led_classdev_resume
);
132 #ifdef CONFIG_PM_SLEEP
133 static int led_suspend(struct device
*dev
)
135 struct led_classdev
*led_cdev
= dev_get_drvdata(dev
);
137 if (led_cdev
->flags
& LED_CORE_SUSPENDRESUME
)
138 led_classdev_suspend(led_cdev
);
143 static int led_resume(struct device
*dev
)
145 struct led_classdev
*led_cdev
= dev_get_drvdata(dev
);
147 if (led_cdev
->flags
& LED_CORE_SUSPENDRESUME
)
148 led_classdev_resume(led_cdev
);
154 static SIMPLE_DEV_PM_OPS(leds_class_dev_pm_ops
, led_suspend
, led_resume
);
156 static int match_name(struct device
*dev
, const void *data
)
160 return !strcmp(dev_name(dev
), (char *)data
);
163 static int led_classdev_next_name(const char *init_name
, char *name
,
170 strlcpy(name
, init_name
, len
);
172 while ((ret
< len
) &&
173 (dev
= class_find_device(leds_class
, NULL
, name
, match_name
))) {
175 ret
= snprintf(name
, len
, "%s_%u", init_name
, ++i
);
185 * led_classdev_register - register a new object of led_classdev class.
186 * @parent: The device to register.
187 * @led_cdev: the led_classdev structure for this device.
189 int led_classdev_register(struct device
*parent
, struct led_classdev
*led_cdev
)
191 char name
[LED_MAX_NAME_SIZE
];
194 ret
= led_classdev_next_name(led_cdev
->name
, name
, sizeof(name
));
198 led_cdev
->dev
= device_create_with_groups(leds_class
, parent
, 0,
199 led_cdev
, led_cdev
->groups
, "%s", name
);
200 if (IS_ERR(led_cdev
->dev
))
201 return PTR_ERR(led_cdev
->dev
);
204 dev_warn(parent
, "Led %s renamed to %s due to name collision",
205 led_cdev
->name
, dev_name(led_cdev
->dev
));
207 led_cdev
->work_flags
= 0;
208 #ifdef CONFIG_LEDS_TRIGGERS
209 init_rwsem(&led_cdev
->trigger_lock
);
211 mutex_init(&led_cdev
->led_access
);
212 /* add to the list of leds */
213 down_write(&leds_list_lock
);
214 list_add_tail(&led_cdev
->node
, &leds_list
);
215 up_write(&leds_list_lock
);
217 if (!led_cdev
->max_brightness
)
218 led_cdev
->max_brightness
= LED_FULL
;
220 led_update_brightness(led_cdev
);
222 led_init_core(led_cdev
);
224 #ifdef CONFIG_LEDS_TRIGGERS
225 led_trigger_set_default(led_cdev
);
228 dev_dbg(parent
, "Registered led device: %s\n",
233 EXPORT_SYMBOL_GPL(led_classdev_register
);
236 * led_classdev_unregister - unregisters a object of led_properties class.
237 * @led_cdev: the led device to unregister
239 * Unregisters a previously registered via led_classdev_register object.
241 void led_classdev_unregister(struct led_classdev
*led_cdev
)
243 #ifdef CONFIG_LEDS_TRIGGERS
244 down_write(&led_cdev
->trigger_lock
);
245 if (led_cdev
->trigger
)
246 led_trigger_set(led_cdev
, NULL
);
247 up_write(&led_cdev
->trigger_lock
);
250 led_cdev
->flags
|= LED_UNREGISTERING
;
253 led_stop_software_blink(led_cdev
);
255 led_set_brightness(led_cdev
, LED_OFF
);
257 flush_work(&led_cdev
->set_brightness_work
);
259 device_unregister(led_cdev
->dev
);
261 down_write(&leds_list_lock
);
262 list_del(&led_cdev
->node
);
263 up_write(&leds_list_lock
);
265 mutex_destroy(&led_cdev
->led_access
);
267 EXPORT_SYMBOL_GPL(led_classdev_unregister
);
269 static void devm_led_classdev_release(struct device
*dev
, void *res
)
271 led_classdev_unregister(*(struct led_classdev
**)res
);
275 * devm_led_classdev_register - resource managed led_classdev_register()
276 * @parent: The device to register.
277 * @led_cdev: the led_classdev structure for this device.
279 int devm_led_classdev_register(struct device
*parent
,
280 struct led_classdev
*led_cdev
)
282 struct led_classdev
**dr
;
285 dr
= devres_alloc(devm_led_classdev_release
, sizeof(*dr
), GFP_KERNEL
);
289 rc
= led_classdev_register(parent
, led_cdev
);
296 devres_add(parent
, dr
);
300 EXPORT_SYMBOL_GPL(devm_led_classdev_register
);
302 static int devm_led_classdev_match(struct device
*dev
, void *res
, void *data
)
304 struct led_cdev
**p
= res
;
306 if (WARN_ON(!p
|| !*p
))
313 * devm_led_classdev_unregister() - resource managed led_classdev_unregister()
314 * @parent: The device to unregister.
315 * @led_cdev: the led_classdev structure for this device.
317 void devm_led_classdev_unregister(struct device
*dev
,
318 struct led_classdev
*led_cdev
)
320 WARN_ON(devres_release(dev
,
321 devm_led_classdev_release
,
322 devm_led_classdev_match
, led_cdev
));
324 EXPORT_SYMBOL_GPL(devm_led_classdev_unregister
);
326 static int __init
leds_init(void)
328 leds_class
= class_create(THIS_MODULE
, "leds");
329 if (IS_ERR(leds_class
))
330 return PTR_ERR(leds_class
);
331 leds_class
->pm
= &leds_class_dev_pm_ops
;
332 leds_class
->dev_groups
= led_groups
;
336 static void __exit
leds_exit(void)
338 class_destroy(leds_class
);
341 subsys_initcall(leds_init
);
342 module_exit(leds_exit
);
344 MODULE_AUTHOR("John Lenz, Richard Purdie");
345 MODULE_LICENSE("GPL");
346 MODULE_DESCRIPTION("LED Class Interface");