4 * Copyright 2005-2006 Openedhand Ltd.
6 * Author: Richard Purdie <rpurdie@openedhand.com>
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
14 #include <linux/kernel.h>
15 #include <linux/list.h>
16 #include <linux/module.h>
17 #include <linux/rwsem.h>
18 #include <linux/leds.h>
21 DECLARE_RWSEM(leds_list_lock
);
22 EXPORT_SYMBOL_GPL(leds_list_lock
);
25 EXPORT_SYMBOL_GPL(leds_list
);
27 static void led_stop_software_blink(struct led_classdev
*led_cdev
)
29 /* deactivate previous settings */
30 del_timer_sync(&led_cdev
->blink_timer
);
31 led_cdev
->blink_delay_on
= 0;
32 led_cdev
->blink_delay_off
= 0;
35 static void led_set_software_blink(struct led_classdev
*led_cdev
,
36 unsigned long delay_on
,
37 unsigned long delay_off
)
39 int current_brightness
;
41 current_brightness
= led_get_brightness(led_cdev
);
42 if (current_brightness
)
43 led_cdev
->blink_brightness
= current_brightness
;
44 if (!led_cdev
->blink_brightness
)
45 led_cdev
->blink_brightness
= led_cdev
->max_brightness
;
47 led_cdev
->blink_delay_on
= delay_on
;
48 led_cdev
->blink_delay_off
= delay_off
;
50 /* never on - don't blink */
54 /* never off - just set to brightness */
56 led_set_brightness(led_cdev
, led_cdev
->blink_brightness
);
60 mod_timer(&led_cdev
->blink_timer
, jiffies
+ 1);
64 void led_blink_set(struct led_classdev
*led_cdev
,
65 unsigned long *delay_on
,
66 unsigned long *delay_off
)
68 del_timer_sync(&led_cdev
->blink_timer
);
70 if (led_cdev
->blink_set
&&
71 !led_cdev
->blink_set(led_cdev
, delay_on
, delay_off
))
74 /* blink with 1 Hz as default if nothing specified */
75 if (!*delay_on
&& !*delay_off
)
76 *delay_on
= *delay_off
= 500;
78 led_set_software_blink(led_cdev
, *delay_on
, *delay_off
);
80 EXPORT_SYMBOL(led_blink_set
);
82 void led_brightness_set(struct led_classdev
*led_cdev
,
83 enum led_brightness brightness
)
85 led_stop_software_blink(led_cdev
);
86 led_cdev
->brightness_set(led_cdev
, brightness
);
88 EXPORT_SYMBOL(led_brightness_set
);