leds-cobalt-qube.c

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/*
 * Copyright 2006 - Florian Fainelli <[email protected]>
 *
 * Control the Cobalt Qube/RaQ front LED
 */
#include <linux/init.h>
#include <linux/io.h>
#include <linux/ioport.h>
#include <linux/leds.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/types.h>

#define LED_FRONT_LEFT  0x01
#define LED_FRONT_RIGHT 0x02

static void __iomem *led_port;
static u8 led_value;

static void qube_front_led_set(struct led_classdev *led_cdev,
                   enum led_brightness brightness)
{
    if (brightness)
        led_value = LED_FRONT_LEFT | LED_FRONT_RIGHT;
    else
        led_value = ~(LED_FRONT_LEFT | LED_FRONT_RIGHT);
    writeb(led_value, led_port);
}

static struct led_classdev qube_front_led = {
    .name           = "qube::front",
    .brightness     = LED_FULL,
    .brightness_set     = qube_front_led_set,
    .default_trigger    = "default-on",
};

static int __devinit cobalt_qube_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 = ioremap(res->start, resource_size(res));
    if (!led_port)
        return -ENOMEM;

    led_value = LED_FRONT_LEFT | LED_FRONT_RIGHT;
    writeb(led_value, led_port);

    retval = led_classdev_register(&pdev->dev, &qube_front_led);
    if (retval)
        goto err_iounmap;

    return 0;

err_iounmap:
    iounmap(led_port);
    led_port = NULL;

    return retval;
}

static int __devexit cobalt_qube_led_remove(struct platform_device *pdev)
{
    led_classdev_unregister(&qube_front_led);

    if (led_port) {
        iounmap(led_port);
        led_port = NULL;
    }

    return 0;
}

static struct platform_driver cobalt_qube_led_driver = {
    .probe  = cobalt_qube_led_probe,
    .remove = __devexit_p(cobalt_qube_led_remove),
    .driver = {
        .name   = "cobalt-qube-leds",
        .owner  = THIS_MODULE,
    },
};

module_platform_driver(cobalt_qube_led_driver);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Front LED support for Cobalt Server");
MODULE_AUTHOR("Florian Fainelli <[email protected]>");
MODULE_ALIAS("platform:cobalt-qube-leds");