aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/leds/leds-cobalt-raq.c
blob: ff0e8c3fbf9b79d61365d456d1d78f314390402e (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
/*
 *  LEDs driver for the Cobalt Raq series.
 *
 *  Copyright (C) 2007  Yoichi Yuasa <yoichi_yuasa@tripeaks.co.jp>
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */
#include <linux/init.h>
#include <linux/io.h>
#include <linux/ioport.h>
#include <linux/leds.h>
#include <linux/platform_device.h>
#include <linux/spinlock.h>
#include <linux/types.h>

#define LED_WEB		0x04
#define LED_POWER_OFF	0x08

static void __iomem *led_port;
static u8 led_value;
static DEFINE_SPINLOCK(led_value_lock);

static void raq_web_led_set(struct led_classdev *led_cdev,
			    enum led_brightness brightness)
{
	unsigned long flags;

	spin_lock_irqsave(&led_value_lock, flags);

	if (brightness)
		led_value |= LED_WEB;
	else
		led_value &= ~LED_WEB;
	writeb(led_value, led_port);

	spin_unlock_irqrestore(&led_value_lock, flags);
}

static struct led_classdev raq_web_led = {
	.name		= "raq-web",
	.brightness_set	= raq_web_led_set,
};

static void raq_power_off_led_set(struct led_classdev *led_cdev,
				  enum led_brightness brightness)
{
	unsigned long flags;

	spin_lock_irqsave(&led_value_lock, flags);

	if (brightness)
		led_value |= LED_POWER_OFF;
	else
		led_value &= ~LED_POWER_OFF;
	writeb(led_value, led_port);

	spin_unlock_irqrestore(&led_value_lock, flags);
}

static struct led_classdev raq_power_off_led = {
	.name			= "raq-power-off",
	.brightness_set		= raq_power_off_led_set,
	.default_trigger	= "power-off",
};

static int __devinit cobalt_raq_led_probe(struct platform_device *pdev)
{
	struct resource *res;
	int retval;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!res)
		return -EBUSY;

	led_port = ioremap(res->start, res->end - res->start + 1);
	if (!led_port)
		return -ENOMEM;

	retval = led_classdev_register(&pdev->dev, &raq_power_off_led);
	if (retval)
		goto err_iounmap;

	retval = led_classdev_register(&pdev->dev, &raq_web_led);
	if (retval)
		goto err_unregister;

	return 0;

err_unregister:
	led_classdev_unregister(&raq_power_off_led);

err_iounmap:
	iounmap(led_port);
	led_port = NULL;

	return retval;
}

static int __devexit cobalt_raq_led_remove(struct platform_device *pdev)
{
	led_classdev_unregister(&raq_power_off_led);
	led_classdev_unregister(&raq_web_led);

	if (led_port) {
		iounmap(led_port);
		led_port = NULL;
	}

	return 0;
}

static struct platform_driver cobalt_raq_led_driver = {
	.probe	= cobalt_raq_led_probe,
	.remove	= __devexit_p(cobalt_raq_led_remove),
	.driver = {
		.name	= "cobalt-raq-leds",
		.owner	= THIS_MODULE,
	},
};

static int __init cobalt_raq_led_init(void)
{
	return platform_driver_register(&cobalt_raq_led_driver);
}

module_init(cobalt_raq_led_init);