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leds-cobalt-qube.c

/*
 * Copyright 2006 - Florian Fainelli <florian@openwrt.org>
 *
 * 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  = "ide-disk",
};

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, res->end - res->start + 1);
      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,
      },
};

static int __init cobalt_qube_led_init(void)
{
      return platform_driver_register(&cobalt_qube_led_driver);
}

static void __exit cobalt_qube_led_exit(void)
{
      platform_driver_unregister(&cobalt_qube_led_driver);
}

module_init(cobalt_qube_led_init);
module_exit(cobalt_qube_led_exit);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Front LED support for Cobalt Server");
MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>");

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