linux/drivers/leds/leds-cobalt-raq.c
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   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
  31static void __iomem *led_port;
  32static u8 led_value;
  33static DEFINE_SPINLOCK(led_value_lock);
  34
  35static 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
  51static struct led_classdev raq_web_led = {
  52        .name           = "raq::web",
  53        .brightness_set = raq_web_led_set,
  54};
  55
  56static 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
  72static 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
  78static 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
 101err_unregister:
 102        led_classdev_unregister(&raq_power_off_led);
 103
 104err_iounmap:
 105        iounmap(led_port);
 106        led_port = NULL;
 107
 108        return retval;
 109}
 110
 111static 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
 124static 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
 133static int __init cobalt_raq_led_init(void)
 134{
 135        return platform_driver_register(&cobalt_raq_led_driver);
 136}
 137
 138module_init(cobalt_raq_led_init);
 139