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_set_software_blink(struct led_classdev
*led_cdev
,
28 unsigned long delay_on
,
29 unsigned long delay_off
)
31 int current_brightness
;
33 current_brightness
= led_get_brightness(led_cdev
);
34 if (current_brightness
)
35 led_cdev
->blink_brightness
= current_brightness
;
36 if (!led_cdev
->blink_brightness
)
37 led_cdev
->blink_brightness
= led_cdev
->max_brightness
;
39 led_cdev
->blink_delay_on
= delay_on
;
40 led_cdev
->blink_delay_off
= delay_off
;
42 /* never on - don't blink */
46 /* never off - just set to brightness */
48 __led_set_brightness(led_cdev
, led_cdev
->blink_brightness
);
52 mod_timer(&led_cdev
->blink_timer
, jiffies
+ 1);
56 void led_blink_setup(struct led_classdev
*led_cdev
,
57 unsigned long *delay_on
,
58 unsigned long *delay_off
)
60 if (!(led_cdev
->flags
& LED_BLINK_ONESHOT
) &&
61 led_cdev
->blink_set
&&
62 !led_cdev
->blink_set(led_cdev
, delay_on
, delay_off
))
65 /* blink with 1 Hz as default if nothing specified */
66 if (!*delay_on
&& !*delay_off
)
67 *delay_on
= *delay_off
= 500;
69 led_set_software_blink(led_cdev
, *delay_on
, *delay_off
);
72 void led_blink_set(struct led_classdev
*led_cdev
,
73 unsigned long *delay_on
,
74 unsigned long *delay_off
)
76 del_timer_sync(&led_cdev
->blink_timer
);
78 led_cdev
->flags
&= ~LED_BLINK_ONESHOT
;
79 led_cdev
->flags
&= ~LED_BLINK_ONESHOT_STOP
;
81 led_blink_setup(led_cdev
, delay_on
, delay_off
);
83 EXPORT_SYMBOL(led_blink_set
);
85 void led_blink_set_oneshot(struct led_classdev
*led_cdev
,
86 unsigned long *delay_on
,
87 unsigned long *delay_off
,
90 if ((led_cdev
->flags
& LED_BLINK_ONESHOT
) &&
91 timer_pending(&led_cdev
->blink_timer
))
94 led_cdev
->flags
|= LED_BLINK_ONESHOT
;
95 led_cdev
->flags
&= ~LED_BLINK_ONESHOT_STOP
;
98 led_cdev
->flags
|= LED_BLINK_INVERT
;
100 led_cdev
->flags
&= ~LED_BLINK_INVERT
;
102 led_blink_setup(led_cdev
, delay_on
, delay_off
);
104 EXPORT_SYMBOL(led_blink_set_oneshot
);
106 void led_set_brightness(struct led_classdev
*led_cdev
,
107 enum led_brightness brightness
)
109 /* stop and clear soft-blink timer */
110 del_timer_sync(&led_cdev
->blink_timer
);
111 led_cdev
->blink_delay_on
= 0;
112 led_cdev
->blink_delay_off
= 0;
114 __led_set_brightness(led_cdev
, brightness
);
116 EXPORT_SYMBOL(led_set_brightness
);