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Yoichi Yuasa97da7aa2007-09-27 17:51:05 +09001/*
2 * LEDs driver for the Cobalt Raq series.
3 *
4 * Copyright (C) 2007 Yoichi Yuasa <yoichi_yuasa@tripeaks.co.jp>
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
Németh Márton4d404fd2008-03-09 20:59:57 +000018 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
Yoichi Yuasa97da7aa2007-09-27 17:51:05 +090019 */
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
31static void __iomem *led_port;
32static u8 led_value;
33static DEFINE_SPINLOCK(led_value_lock);
34
35static void raq_web_led_set(struct led_classdev *led_cdev,
Németh Márton4d404fd2008-03-09 20:59:57 +000036 enum led_brightness brightness)
Yoichi Yuasa97da7aa2007-09-27 17:51:05 +090037{
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
51static struct led_classdev raq_web_led = {
52 .name = "raq-web",
53 .brightness_set = raq_web_led_set,
54};
55
56static void raq_power_off_led_set(struct led_classdev *led_cdev,
Németh Márton4d404fd2008-03-09 20:59:57 +000057 enum led_brightness brightness)
Yoichi Yuasa97da7aa2007-09-27 17:51:05 +090058{
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
72static 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
78static 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, res->end - res->start + 1);
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
101err_unregister:
102 led_classdev_unregister(&raq_power_off_led);
103
104err_iounmap:
105 iounmap(led_port);
106 led_port = NULL;
107
108 return retval;
109}
110
111static 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
124static 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
133static int __init cobalt_raq_led_init(void)
134{
135 return platform_driver_register(&cobalt_raq_led_driver);
136}
137
138module_init(cobalt_raq_led_init);