linux/drivers/leds/leds-cobalt-raq.c
<<
>>
Prefs
   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
  32static void __iomem *led_port;
  33static u8 led_value;
  34static DEFINE_SPINLOCK(led_value_lock);
  35
  36static 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
  52static struct led_classdev raq_web_led = {
  53        .name           = "raq::web",
  54        .brightness_set = raq_web_led_set,
  55};
  56
  57static 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
  73static 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
  79static 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
 102err_unregister:
 103        led_classdev_unregister(&raq_power_off_led);
 104
 105err_null:
 106        led_port = NULL;
 107
 108        return retval;
 109}
 110
 111static 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
 122static 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
 131static int __init cobalt_raq_led_init(void)
 132{
 133        return platform_driver_register(&cobalt_raq_led_driver);
 134}
 135
 136module_init(cobalt_raq_led_init);
 137
lxr.linux.no kindly hosted by Redpill Linpro AS, provider of Linux consulting and operations services since 1995.