[SCSI] mpt2sas: sanity added to remove duplicate port from topology
[linux-2.6.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
28 #define LED_WEB         0x04
29 #define LED_POWER_OFF   0x08
30
31 static void __iomem *led_port;
32 static u8 led_value;
33 static DEFINE_SPINLOCK(led_value_lock);
34
35 static void raq_web_led_set(struct led_classdev *led_cdev,
36                             enum led_brightness brightness)
37 {
38         unsigned long flags;
39
40         spin_lock_irqsave(&led_value_lock, flags);
41
42         if (brightness)
43                 led_value |= LED_WEB;
44         else
45                 led_value &= ~LED_WEB;
46         writeb(led_value, led_port);
47
48         spin_unlock_irqrestore(&led_value_lock, flags);
49 }
50
51 static struct led_classdev raq_web_led = {
52         .name           = "raq::web",
53         .brightness_set = raq_web_led_set,
54 };
55
56 static void raq_power_off_led_set(struct led_classdev *led_cdev,
57                                   enum led_brightness brightness)
58 {
59         unsigned long flags;
60
61         spin_lock_irqsave(&led_value_lock, flags);
62
63         if (brightness)
64                 led_value |= LED_POWER_OFF;
65         else
66                 led_value &= ~LED_POWER_OFF;
67         writeb(led_value, led_port);
68
69         spin_unlock_irqrestore(&led_value_lock, flags);
70 }
71
72 static struct led_classdev raq_power_off_led = {
73         .name                   = "raq::power-off",
74         .brightness_set         = raq_power_off_led_set,
75         .default_trigger        = "power-off",
76 };
77
78 static int __devinit cobalt_raq_led_probe(struct platform_device *pdev)
79 {
80         struct resource *res;
81         int retval;
82
83         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
84         if (!res)
85                 return -EBUSY;
86
87         led_port = ioremap(res->start, resource_size(res));
88         if (!led_port)
89                 return -ENOMEM;
90
91         retval = led_classdev_register(&pdev->dev, &raq_power_off_led);
92         if (retval)
93                 goto err_iounmap;
94
95         retval = led_classdev_register(&pdev->dev, &raq_web_led);
96         if (retval)
97                 goto err_unregister;
98
99         return 0;
100
101 err_unregister:
102         led_classdev_unregister(&raq_power_off_led);
103
104 err_iounmap:
105         iounmap(led_port);
106         led_port = NULL;
107
108         return retval;
109 }
110
111 static int __devexit cobalt_raq_led_remove(struct platform_device *pdev)
112 {
113         led_classdev_unregister(&raq_power_off_led);
114         led_classdev_unregister(&raq_web_led);
115
116         if (led_port) {
117                 iounmap(led_port);
118                 led_port = NULL;
119         }
120
121         return 0;
122 }
123
124 static struct platform_driver cobalt_raq_led_driver = {
125         .probe  = cobalt_raq_led_probe,
126         .remove = __devexit_p(cobalt_raq_led_remove),
127         .driver = {
128                 .name   = "cobalt-raq-leds",
129                 .owner  = THIS_MODULE,
130         },
131 };
132
133 static int __init cobalt_raq_led_init(void)
134 {
135         return platform_driver_register(&cobalt_raq_led_driver);
136 }
137
138 module_init(cobalt_raq_led_init);