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awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/drivers/leds/leds-cobalt-qube.c
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/*

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 * Copyright 2006 - Florian Fainelli <[email protected]>

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 *

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 * Control the Cobalt Qube/RaQ front LED

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 */

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#include <linux/init.h>

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#include <linux/io.h>

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#include <linux/ioport.h>

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#include <linux/leds.h>

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#include <linux/module.h>

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#include <linux/platform_device.h>

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#include <linux/types.h>

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#define LED_FRONT_LEFT	0x01

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#define LED_FRONT_RIGHT	0x02

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static void __iomem *led_port;

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static u8 led_value;

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static void qube_front_led_set(struct led_classdev *led_cdev,

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			       enum led_brightness brightness)

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{

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	if (brightness)

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		led_value = LED_FRONT_LEFT | LED_FRONT_RIGHT;

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	else

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		led_value = ~(LED_FRONT_LEFT | LED_FRONT_RIGHT);

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	writeb(led_value, led_port);

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}

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static struct led_classdev qube_front_led = {

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	.name			= "qube::front",

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	.brightness		= LED_FULL,

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	.brightness_set		= qube_front_led_set,

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	.default_trigger	= "default-on",

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};

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static int __devinit cobalt_qube_led_probe(struct platform_device *pdev)

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{

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	struct resource *res;

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	int retval;

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	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);

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	if (!res)

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		return -EBUSY;

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	led_port = ioremap(res->start, resource_size(res));

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	if (!led_port)

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		return -ENOMEM;

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	led_value = LED_FRONT_LEFT | LED_FRONT_RIGHT;

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	writeb(led_value, led_port);

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

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	if (retval)

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		goto err_iounmap;

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	return 0;

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err_iounmap:

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	iounmap(led_port);

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	led_port = NULL;

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	return retval;

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}

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static int __devexit cobalt_qube_led_remove(struct platform_device *pdev)

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{

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	led_classdev_unregister(&qube_front_led);

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	if (led_port) {

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		iounmap(led_port);

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		led_port = NULL;

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	}

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	return 0;

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}

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/* work with hotplug and coldplug */

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MODULE_ALIAS("platform:cobalt-qube-leds");

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static struct platform_driver cobalt_qube_led_driver = {

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	.probe	= cobalt_qube_led_probe,

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	.remove	= __devexit_p(cobalt_qube_led_remove),

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	.driver	= {

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		.name	= "cobalt-qube-leds",

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		.owner	= THIS_MODULE,

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	},

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};

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static int __init cobalt_qube_led_init(void)

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{

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	return platform_driver_register(&cobalt_qube_led_driver);

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}

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static void __exit cobalt_qube_led_exit(void)

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{

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	platform_driver_unregister(&cobalt_qube_led_driver);

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}

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module_init(cobalt_qube_led_init);

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module_exit(cobalt_qube_led_exit);

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MODULE_LICENSE("GPL");

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MODULE_DESCRIPTION("Front LED support for Cobalt Server");

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MODULE_AUTHOR("Florian Fainelli <[email protected]>");

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