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 struct platform_driver cobalt_raq_led_driver = {
 112         .probe  = cobalt_raq_led_probe,
 113         .driver = {
 114                 .name   = "cobalt-raq-leds",
 115         },
 116 };
 117
 118 static int __init cobalt_raq_led_init(void)
 119 {
 120         return platform_driver_register(&cobalt_raq_led_driver);
 121 }
 122 device_initcall(cobalt_raq_led_init);