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/jiffies.h>
16 #include <linux/kernel.h>
17 #include <linux/init.h>
18 #include <linux/list.h>
19 #include <linux/spinlock.h>
20 #include <linux/device.h>
21 #include <linux/sysdev.h>
22 #include <linux/timer.h>
23 #include <linux/ctype.h>
24 #include <linux/leds.h>
27 struct timer_trig_data
{
28 unsigned long delay_on
; /* milliseconds on */
29 unsigned long delay_off
; /* milliseconds off */
30 struct timer_list timer
;
33 static void led_timer_function(unsigned long data
)
35 struct led_classdev
*led_cdev
= (struct led_classdev
*) data
;
36 struct timer_trig_data
*timer_data
= led_cdev
->trigger_data
;
37 unsigned long brightness
= LED_OFF
;
38 unsigned long delay
= timer_data
->delay_off
;
40 if (!timer_data
->delay_on
|| !timer_data
->delay_off
) {
41 led_set_brightness(led_cdev
, LED_OFF
);
45 if (!led_cdev
->brightness
) {
46 brightness
= LED_FULL
;
47 delay
= timer_data
->delay_on
;
50 led_set_brightness(led_cdev
, brightness
);
52 mod_timer(&timer_data
->timer
, jiffies
+ msecs_to_jiffies(delay
));
55 static ssize_t
led_delay_on_show(struct device
*dev
,
56 struct device_attribute
*attr
, char *buf
)
58 struct led_classdev
*led_cdev
= dev_get_drvdata(dev
);
59 struct timer_trig_data
*timer_data
= led_cdev
->trigger_data
;
61 sprintf(buf
, "%lu\n", timer_data
->delay_on
);
63 return strlen(buf
) + 1;
66 static ssize_t
led_delay_on_store(struct device
*dev
,
67 struct device_attribute
*attr
, const char *buf
, size_t size
)
69 struct led_classdev
*led_cdev
= dev_get_drvdata(dev
);
70 struct timer_trig_data
*timer_data
= led_cdev
->trigger_data
;
73 unsigned long state
= simple_strtoul(buf
, &after
, 10);
74 size_t count
= after
- buf
;
76 if (*after
&& isspace(*after
))
80 timer_data
->delay_on
= state
;
81 mod_timer(&timer_data
->timer
, jiffies
+ 1);
88 static ssize_t
led_delay_off_show(struct device
*dev
,
89 struct device_attribute
*attr
, char *buf
)
91 struct led_classdev
*led_cdev
= dev_get_drvdata(dev
);
92 struct timer_trig_data
*timer_data
= led_cdev
->trigger_data
;
94 sprintf(buf
, "%lu\n", timer_data
->delay_off
);
96 return strlen(buf
) + 1;
99 static ssize_t
led_delay_off_store(struct device
*dev
,
100 struct device_attribute
*attr
, const char *buf
, size_t size
)
102 struct led_classdev
*led_cdev
= dev_get_drvdata(dev
);
103 struct timer_trig_data
*timer_data
= led_cdev
->trigger_data
;
106 unsigned long state
= simple_strtoul(buf
, &after
, 10);
107 size_t count
= after
- buf
;
109 if (*after
&& isspace(*after
))
113 timer_data
->delay_off
= state
;
114 mod_timer(&timer_data
->timer
, jiffies
+ 1);
121 static DEVICE_ATTR(delay_on
, 0644, led_delay_on_show
, led_delay_on_store
);
122 static DEVICE_ATTR(delay_off
, 0644, led_delay_off_show
, led_delay_off_store
);
124 static void timer_trig_activate(struct led_classdev
*led_cdev
)
126 struct timer_trig_data
*timer_data
;
129 timer_data
= kzalloc(sizeof(struct timer_trig_data
), GFP_KERNEL
);
133 led_cdev
->trigger_data
= timer_data
;
135 init_timer(&timer_data
->timer
);
136 timer_data
->timer
.function
= led_timer_function
;
137 timer_data
->timer
.data
= (unsigned long) led_cdev
;
139 rc
= device_create_file(led_cdev
->dev
, &dev_attr_delay_on
);
142 rc
= device_create_file(led_cdev
->dev
, &dev_attr_delay_off
);
144 goto err_out_delayon
;
149 device_remove_file(led_cdev
->dev
, &dev_attr_delay_on
);
151 led_cdev
->trigger_data
= NULL
;
155 static void timer_trig_deactivate(struct led_classdev
*led_cdev
)
157 struct timer_trig_data
*timer_data
= led_cdev
->trigger_data
;
160 device_remove_file(led_cdev
->dev
, &dev_attr_delay_on
);
161 device_remove_file(led_cdev
->dev
, &dev_attr_delay_off
);
162 del_timer_sync(&timer_data
->timer
);
167 static struct led_trigger timer_led_trigger
= {
169 .activate
= timer_trig_activate
,
170 .deactivate
= timer_trig_deactivate
,
173 static int __init
timer_trig_init(void)
175 return led_trigger_register(&timer_led_trigger
);
178 static void __exit
timer_trig_exit(void)
180 led_trigger_unregister(&timer_led_trigger
);
183 module_init(timer_trig_init
);
184 module_exit(timer_trig_exit
);
186 MODULE_AUTHOR("Richard Purdie <rpurdie@openedhand.com>");
187 MODULE_DESCRIPTION("Timer LED trigger");
188 MODULE_LICENSE("GPL");