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Merge branch 'integrity-check-patch-v2' of git://btrfs.giantdisaster.de/git/btrfs...
[karo-tx-linux.git] / drivers / leds / leds-cobalt-raq.c
1 /*
2  *  LEDs driver for the Cobalt Raq series.
3  *
4  *  Copyright (C) 2007  Yoichi Yuasa <yuasa@linux-mips.org>
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 as published by
8  *  the Free Software Foundation; either version 2 of the License, or
9  *  (at your option) any later version.
10  *
11  *  This program is distributed in the hope that it will be useful,
12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14  *  GNU General Public License for more details.
15  *
16  *  You should have received a copy of the GNU General Public License
17  *  along with this program; if not, write to the Free Software
18  *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 #include <linux/init.h>
21 #include <linux/io.h>
22 #include <linux/ioport.h>
23 #include <linux/leds.h>
24 #include <linux/platform_device.h>
25 #include <linux/spinlock.h>
26 #include <linux/types.h>
27 #include <linux/export.h>
28
29 #define LED_WEB         0x04
30 #define LED_POWER_OFF   0x08
31
32 static void __iomem *led_port;
33 static u8 led_value;
34 static DEFINE_SPINLOCK(led_value_lock);
35
36 static void raq_web_led_set(struct led_classdev *led_cdev,
37                             enum led_brightness brightness)
38 {
39         unsigned long flags;
40
41         spin_lock_irqsave(&led_value_lock, flags);
42
43         if (brightness)
44                 led_value |= LED_WEB;
45         else
46                 led_value &= ~LED_WEB;
47         writeb(led_value, led_port);
48
49         spin_unlock_irqrestore(&led_value_lock, flags);
50 }
51
52 static struct led_classdev raq_web_led = {
53         .name           = "raq::web",
54         .brightness_set = raq_web_led_set,
55 };
56
57 static void raq_power_off_led_set(struct led_classdev *led_cdev,
58                                   enum led_brightness brightness)
59 {
60         unsigned long flags;
61
62         spin_lock_irqsave(&led_value_lock, flags);
63
64         if (brightness)
65                 led_value |= LED_POWER_OFF;
66         else
67                 led_value &= ~LED_POWER_OFF;
68         writeb(led_value, led_port);
69
70         spin_unlock_irqrestore(&led_value_lock, flags);
71 }
72
73 static struct led_classdev raq_power_off_led = {
74         .name                   = "raq::power-off",
75         .brightness_set         = raq_power_off_led_set,
76         .default_trigger        = "power-off",
77 };
78
79 static int __devinit cobalt_raq_led_probe(struct platform_device *pdev)
80 {
81         struct resource *res;
82         int retval;
83
84         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
85         if (!res)
86                 return -EBUSY;
87
88         led_port = ioremap(res->start, resource_size(res));
89         if (!led_port)
90                 return -ENOMEM;
91
92         retval = led_classdev_register(&pdev->dev, &raq_power_off_led);
93         if (retval)
94                 goto err_iounmap;
95
96         retval = led_classdev_register(&pdev->dev, &raq_web_led);
97         if (retval)
98                 goto err_unregister;
99
100         return 0;
101
102 err_unregister:
103         led_classdev_unregister(&raq_power_off_led);
104
105 err_iounmap:
106         iounmap(led_port);
107         led_port = NULL;
108
109         return retval;
110 }
111
112 static int __devexit cobalt_raq_led_remove(struct platform_device *pdev)
113 {
114         led_classdev_unregister(&raq_power_off_led);
115         led_classdev_unregister(&raq_web_led);
116
117         if (led_port) {
118                 iounmap(led_port);
119                 led_port = NULL;
120         }
121
122         return 0;
123 }
124
125 static struct platform_driver cobalt_raq_led_driver = {
126         .probe  = cobalt_raq_led_probe,
127         .remove = __devexit_p(cobalt_raq_led_remove),
128         .driver = {
129                 .name   = "cobalt-raq-leds",
130                 .owner  = THIS_MODULE,
131         },
132 };
133
134 static int __init cobalt_raq_led_init(void)
135 {
136         return platform_driver_register(&cobalt_raq_led_driver);
137 }
138
139 module_init(cobalt_raq_led_init);