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
32static void __iomem *led_port;
33static u8 led_value;
34static DEFINE_SPINLOCK(led_value_lock);
35
36static 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
52static struct led_classdev raq_web_led = {
53	.name		= "raq::web",
54	.brightness_set	= raq_web_led_set,
55};
56
57static 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
73static 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
79static int 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 = devm_ioremap(&pdev->dev, 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_null;
95
96	retval = led_classdev_register(&pdev->dev, &raq_web_led);
97	if (retval)
98		goto err_unregister;
99
100	return 0;
101
102err_unregister:
103	led_classdev_unregister(&raq_power_off_led);
104
105err_null:
106	led_port = NULL;
107
108	return retval;
109}
110
111static struct platform_driver cobalt_raq_led_driver = {
112	.probe	= cobalt_raq_led_probe,
113	.driver = {
114		.name	= "cobalt-raq-leds",
115	},
116};
117
118static int __init cobalt_raq_led_init(void)
119{
120	return platform_driver_register(&cobalt_raq_led_driver);
121}
122device_initcall(cobalt_raq_led_init);
123