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
  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);