leds: Convert from struct class_device to struct device
[linux-2.6.git] / drivers / leds / ledtrig-timer.c
1 /*
2  * LED Kernel Timer Trigger
3  *
4  * Copyright 2005-2006 Openedhand Ltd.
5  *
6  * Author: Richard Purdie <rpurdie@openedhand.com>
7  *
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.
11  *
12  */
13
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>
25 #include "leds.h"
26
27 struct timer_trig_data {
28         unsigned long delay_on;         /* milliseconds on */
29         unsigned long delay_off;        /* milliseconds off */
30         struct timer_list timer;
31 };
32
33 static void led_timer_function(unsigned long data)
34 {
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;
39
40         if (!timer_data->delay_on || !timer_data->delay_off) {
41                 led_set_brightness(led_cdev, LED_OFF);
42                 return;
43         }
44
45         if (!led_cdev->brightness) {
46                 brightness = LED_FULL;
47                 delay = timer_data->delay_on;
48         }
49
50         led_set_brightness(led_cdev, brightness);
51
52         mod_timer(&timer_data->timer, jiffies + msecs_to_jiffies(delay));
53 }
54
55 static ssize_t led_delay_on_show(struct device *dev, 
56                 struct device_attribute *attr, char *buf)
57 {
58         struct led_classdev *led_cdev = dev_get_drvdata(dev);
59         struct timer_trig_data *timer_data = led_cdev->trigger_data;
60
61         sprintf(buf, "%lu\n", timer_data->delay_on);
62
63         return strlen(buf) + 1;
64 }
65
66 static ssize_t led_delay_on_store(struct device *dev, 
67                 struct device_attribute *attr, const char *buf, size_t size)
68 {
69         struct led_classdev *led_cdev = dev_get_drvdata(dev);
70         struct timer_trig_data *timer_data = led_cdev->trigger_data;
71         int ret = -EINVAL;
72         char *after;
73         unsigned long state = simple_strtoul(buf, &after, 10);
74         size_t count = after - buf;
75
76         if (*after && isspace(*after))
77                 count++;
78
79         if (count == size) {
80                 timer_data->delay_on = state;
81                 mod_timer(&timer_data->timer, jiffies + 1);
82                 ret = count;
83         }
84
85         return ret;
86 }
87
88 static ssize_t led_delay_off_show(struct device *dev, 
89                 struct device_attribute *attr, char *buf)
90 {
91         struct led_classdev *led_cdev = dev_get_drvdata(dev);
92         struct timer_trig_data *timer_data = led_cdev->trigger_data;
93
94         sprintf(buf, "%lu\n", timer_data->delay_off);
95
96         return strlen(buf) + 1;
97 }
98
99 static ssize_t led_delay_off_store(struct device *dev, 
100                 struct device_attribute *attr, const char *buf, size_t size)
101 {
102         struct led_classdev *led_cdev = dev_get_drvdata(dev);
103         struct timer_trig_data *timer_data = led_cdev->trigger_data;
104         int ret = -EINVAL;
105         char *after;
106         unsigned long state = simple_strtoul(buf, &after, 10);
107         size_t count = after - buf;
108
109         if (*after && isspace(*after))
110                 count++;
111
112         if (count == size) {
113                 timer_data->delay_off = state;
114                 mod_timer(&timer_data->timer, jiffies + 1);
115                 ret = count;
116         }
117
118         return ret;
119 }
120
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);
123
124 static void timer_trig_activate(struct led_classdev *led_cdev)
125 {
126         struct timer_trig_data *timer_data;
127         int rc;
128
129         timer_data = kzalloc(sizeof(struct timer_trig_data), GFP_KERNEL);
130         if (!timer_data)
131                 return;
132
133         led_cdev->trigger_data = timer_data;
134
135         init_timer(&timer_data->timer);
136         timer_data->timer.function = led_timer_function;
137         timer_data->timer.data = (unsigned long) led_cdev;
138
139         rc = device_create_file(led_cdev->dev, &dev_attr_delay_on);
140         if (rc)
141                 goto err_out;
142         rc = device_create_file(led_cdev->dev, &dev_attr_delay_off);
143         if (rc)
144                 goto err_out_delayon;
145
146         return;
147
148 err_out_delayon:
149         device_remove_file(led_cdev->dev, &dev_attr_delay_on);
150 err_out:
151         led_cdev->trigger_data = NULL;
152         kfree(timer_data);
153 }
154
155 static void timer_trig_deactivate(struct led_classdev *led_cdev)
156 {
157         struct timer_trig_data *timer_data = led_cdev->trigger_data;
158
159         if (timer_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);
163                 kfree(timer_data);
164         }
165 }
166
167 static struct led_trigger timer_led_trigger = {
168         .name     = "timer",
169         .activate = timer_trig_activate,
170         .deactivate = timer_trig_deactivate,
171 };
172
173 static int __init timer_trig_init(void)
174 {
175         return led_trigger_register(&timer_led_trigger);
176 }
177
178 static void __exit timer_trig_exit(void)
179 {
180         led_trigger_unregister(&timer_led_trigger);
181 }
182
183 module_init(timer_trig_init);
184 module_exit(timer_trig_exit);
185
186 MODULE_AUTHOR("Richard Purdie <rpurdie@openedhand.com>");
187 MODULE_DESCRIPTION("Timer LED trigger");
188 MODULE_LICENSE("GPL");