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 
32 static void __iomem *led_port;
33 static u8 led_value;
34 static DEFINE_SPINLOCK(led_value_lock);
35 
36 static 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 
52 static struct led_classdev raq_web_led = {
53 	.name		= "raq::web",
54 	.brightness_set	= raq_web_led_set,
55 };
56 
57 static 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 
73 static 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 
79 static 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 
102 err_unregister:
103 	led_classdev_unregister(&raq_power_off_led);
104 
105 err_null:
106 	led_port = NULL;
107 
108 	return retval;
109 }
110 
111 static int 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 		led_port = NULL;
118 
119 	return 0;
120 }
121 
122 static struct platform_driver cobalt_raq_led_driver = {
123 	.probe	= cobalt_raq_led_probe,
124 	.remove	= cobalt_raq_led_remove,
125 	.driver = {
126 		.name	= "cobalt-raq-leds",
127 	},
128 };
129 
130 static int __init cobalt_raq_led_init(void)
131 {
132 	return platform_driver_register(&cobalt_raq_led_driver);
133 }
134 
135 module_init(cobalt_raq_led_init);
136