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);
139