[PATCH] LED: Improve Kconfig information
[linux-2.6.git] / drivers / leds / leds-locomo.c
1 /*
2  * linux/drivers/leds/locomo.c
3  *
4  * Copyright (C) 2005 John Lenz <lenz@cs.wisc.edu>
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License version 2 as
8  * published by the Free Software Foundation.
9  */
10
11 #include <linux/config.h>
12 #include <linux/kernel.h>
13 #include <linux/init.h>
14 #include <linux/device.h>
15 #include <linux/leds.h>
16
17 #include <asm/hardware.h>
18 #include <asm/hardware/locomo.h>
19
20 static void locomoled_brightness_set(struct led_classdev *led_cdev,
21                                 enum led_brightness value, int offset)
22 {
23         struct locomo_dev *locomo_dev = LOCOMO_DEV(led_cdev->class_dev->dev);
24         unsigned long flags;
25
26         local_irq_save(flags);
27         if (value)
28                 locomo_writel(LOCOMO_LPT_TOFH, locomo_dev->mapbase + offset);
29         else
30                 locomo_writel(LOCOMO_LPT_TOFL, locomo_dev->mapbase + offset);
31         local_irq_restore(flags);
32 }
33
34 static void locomoled_brightness_set0(struct led_classdev *led_cdev,
35                                 enum led_brightness value)
36 {
37         locomoled_brightness_set(led_cdev, value, LOCOMO_LPT0);
38 }
39
40 static void locomoled_brightness_set1(struct led_classdev *led_cdev,
41                                 enum led_brightness value)
42 {
43         locomoled_brightness_set(led_cdev, value, LOCOMO_LPT1);
44 }
45
46 static struct led_classdev locomo_led0 = {
47         .name                   = "locomo:amber",
48         .brightness_set         = locomoled_brightness_set0,
49 };
50
51 static struct led_classdev locomo_led1 = {
52         .name                   = "locomo:green",
53         .brightness_set         = locomoled_brightness_set1,
54 };
55
56 static int locomoled_probe(struct locomo_dev *ldev)
57 {
58         int ret;
59
60         ret = led_classdev_register(&ldev->dev, &locomo_led0);
61         if (ret < 0)
62                 return ret;
63
64         ret = led_classdev_register(&ldev->dev, &locomo_led1);
65         if (ret < 0)
66                 led_classdev_unregister(&locomo_led0);
67
68         return ret;
69 }
70
71 static int locomoled_remove(struct locomo_dev *dev)
72 {
73         led_classdev_unregister(&locomo_led0);
74         led_classdev_unregister(&locomo_led1);
75         return 0;
76 }
77
78 static struct locomo_driver locomoled_driver = {
79         .drv = {
80                 .name = "locomoled"
81         },
82         .devid  = LOCOMO_DEVID_LED,
83         .probe  = locomoled_probe,
84         .remove = locomoled_remove,
85 };
86
87 static int __init locomoled_init(void)
88 {
89         return locomo_driver_register(&locomoled_driver);
90 }
91 module_init(locomoled_init);
92
93 MODULE_AUTHOR("John Lenz <lenz@cs.wisc.edu>");
94 MODULE_DESCRIPTION("Locomo LED driver");
95 MODULE_LICENSE("GPL");