leds-cobalt-raq.c
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/*
* LEDs driver for the Cobalt Raq series.
*
* Copyright (C) 2007 Yoichi Yuasa <yuasa@linux-mips.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <linux/init.h>
#include <linux/io.h>
#include <linux/ioport.h>
#include <linux/leds.h>
#include <linux/platform_device.h>
#include <linux/spinlock.h>
#include <linux/types.h>
#include <linux/export.h>
#define LED_WEB 0x04
#define LED_POWER_OFF 0x08
static void __iomem *led_port;
static u8 led_value;
static DEFINE_SPINLOCK(led_value_lock);
static void raq_web_led_set(struct led_classdev *led_cdev,
enum led_brightness brightness)
{
unsigned long flags;
spin_lock_irqsave(&led_value_lock, flags);
if (brightness)
led_value |= LED_WEB;
else
led_value &= ~LED_WEB;
writeb(led_value, led_port);
spin_unlock_irqrestore(&led_value_lock, flags);
}
static struct led_classdev raq_web_led = {
.name = "raq::web",
.brightness_set = raq_web_led_set,
};
static void raq_power_off_led_set(struct led_classdev *led_cdev,
enum led_brightness brightness)
{
unsigned long flags;
spin_lock_irqsave(&led_value_lock, flags);
if (brightness)
led_value |= LED_POWER_OFF;
else
led_value &= ~LED_POWER_OFF;
writeb(led_value, led_port);
spin_unlock_irqrestore(&led_value_lock, flags);
}
static struct led_classdev raq_power_off_led = {
.name = "raq::power-off",
.brightness_set = raq_power_off_led_set,
.default_trigger = "power-off",
};
static int cobalt_raq_led_probe(struct platform_device *pdev)
{
struct resource *res;
int retval;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res)
return -EBUSY;
led_port = devm_ioremap(&pdev->dev, res->start, resource_size(res));
if (!led_port)
return -ENOMEM;
retval = led_classdev_register(&pdev->dev, &raq_power_off_led);
if (retval)
goto err_null;
retval = led_classdev_register(&pdev->dev, &raq_web_led);
if (retval)
goto err_unregister;
return 0;
err_unregister:
led_classdev_unregister(&raq_power_off_led);
err_null:
led_port = NULL;
return retval;
}
static struct platform_driver cobalt_raq_led_driver = {
.probe = cobalt_raq_led_probe,
.driver = {
.name = "cobalt-raq-leds",
},
};
static int __init cobalt_raq_led_init(void)
{
return platform_driver_register(&cobalt_raq_led_driver);
}
device_initcall(cobalt_raq_led_init);