Version:  2.0.40 2.2.26 2.4.37 2.6.39 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15

Linux/drivers/leds/leds-cobalt-raq.c

  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                 .owner  = THIS_MODULE,
128         },
129 };
130 
131 static int __init cobalt_raq_led_init(void)
132 {
133         return platform_driver_register(&cobalt_raq_led_driver);
134 }
135 
136 module_init(cobalt_raq_led_init);
137 

This page was automatically generated by LXR 0.3.1 (source).  •  Linux is a registered trademark of Linus Torvalds  •  Contact us