2 * LED Kernel Timer Trigger
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/module.h>
15 #include <linux/kernel.h>
16 #include <linux/init.h>
17 #include <linux/device.h>
18 #include <linux/ctype.h>
19 #include <linux/leds.h>
22 static ssize_t
led_delay_on_show(struct device
*dev
,
23 struct device_attribute
*attr
, char *buf
)
25 struct led_classdev
*led_cdev
= dev_get_drvdata(dev
);
27 return sprintf(buf
, "%lu\n", led_cdev
->blink_delay_on
);
30 static ssize_t
led_delay_on_store(struct device
*dev
,
31 struct device_attribute
*attr
, const char *buf
, size_t size
)
33 struct led_classdev
*led_cdev
= dev_get_drvdata(dev
);
35 ssize_t ret
= -EINVAL
;
37 ret
= kstrtoul(buf
, 10, &state
);
41 led_blink_set(led_cdev
, &state
, &led_cdev
->blink_delay_off
);
42 led_cdev
->blink_delay_on
= state
;
47 static ssize_t
led_delay_off_show(struct device
*dev
,
48 struct device_attribute
*attr
, char *buf
)
50 struct led_classdev
*led_cdev
= dev_get_drvdata(dev
);
52 return sprintf(buf
, "%lu\n", led_cdev
->blink_delay_off
);
55 static ssize_t
led_delay_off_store(struct device
*dev
,
56 struct device_attribute
*attr
, const char *buf
, size_t size
)
58 struct led_classdev
*led_cdev
= dev_get_drvdata(dev
);
60 ssize_t ret
= -EINVAL
;
62 ret
= kstrtoul(buf
, 10, &state
);
66 led_blink_set(led_cdev
, &led_cdev
->blink_delay_on
, &state
);
67 led_cdev
->blink_delay_off
= state
;
72 static DEVICE_ATTR(delay_on
, 0644, led_delay_on_show
, led_delay_on_store
);
73 static DEVICE_ATTR(delay_off
, 0644, led_delay_off_show
, led_delay_off_store
);
75 static void timer_trig_activate(struct led_classdev
*led_cdev
)
79 led_cdev
->trigger_data
= NULL
;
81 rc
= device_create_file(led_cdev
->dev
, &dev_attr_delay_on
);
84 rc
= device_create_file(led_cdev
->dev
, &dev_attr_delay_off
);
88 led_blink_set(led_cdev
, &led_cdev
->blink_delay_on
,
89 &led_cdev
->blink_delay_off
);
90 led_cdev
->activated
= true;
95 device_remove_file(led_cdev
->dev
, &dev_attr_delay_on
);
98 static void timer_trig_deactivate(struct led_classdev
*led_cdev
)
100 if (led_cdev
->activated
) {
101 device_remove_file(led_cdev
->dev
, &dev_attr_delay_on
);
102 device_remove_file(led_cdev
->dev
, &dev_attr_delay_off
);
103 led_cdev
->activated
= false;
107 led_set_brightness(led_cdev
, LED_OFF
);
110 static struct led_trigger timer_led_trigger
= {
112 .activate
= timer_trig_activate
,
113 .deactivate
= timer_trig_deactivate
,
116 static int __init
timer_trig_init(void)
118 return led_trigger_register(&timer_led_trigger
);
121 static void __exit
timer_trig_exit(void)
123 led_trigger_unregister(&timer_led_trigger
);
126 module_init(timer_trig_init
);
127 module_exit(timer_trig_exit
);
129 MODULE_AUTHOR("Richard Purdie <rpurdie@openedhand.com>");
130 MODULE_DESCRIPTION("Timer LED trigger");
131 MODULE_LICENSE("GPL");