linux-kernel - LED module not creating /sys/class/leds entry

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Date:	Sun, 04 Aug 2013 23:27:08 -0500
From:	Ian Pilcher <arequipeno@...il.com>
To:	linux-kernel@...r.kernel.org
Subject: LED module not creating /sys/class/leds entry

I am trying to understand the LED API.  I have created an extremely
simple "dummy" LED module (see below), which loads without any errors,
but /sys/class/leds is empty.

Any pointers on what additional steps I need to take to get my "LED" to
show up are greatly appreciated.

Thanks!

#include <linux/leds.h>
#include <linux/module.h>
#include <linux/platform_device.h>

static enum led_brightness dummy_led_brightness = LED_OFF;

static void dummy_led_set_brightness(struct led_classdev *cdev,
				     enum led_brightness brightness)
{
	dummy_led_brightness = brightness;
}

static enum led_brightness dummy_led_get_brightness(struct led_classdev
*cdev)
{
	return dummy_led_brightness;
}

static struct led_classdev dummy_led_cdev = {
	.name = "dummy",
	.brightness_set = dummy_led_set_brightness,
	.brightness_get = dummy_led_get_brightness,
};

static int dummy_led_probe(struct platform_device *pdev)
{
	return led_classdev_register(&pdev->dev, &dummy_led_cdev);
}

static int dummy_led_remove(struct platform_device *pdev)
{
	led_classdev_unregister(&dummy_led_cdev);
	return 0;
}

static struct platform_driver dummy_led_driver = {
	.probe = dummy_led_probe,
	.remove = dummy_led_remove,
	.driver = {
		.name = "dummy-led",
		.owner = THIS_MODULE,
	},
};

static int __init dummy_led_init(void)
{
	return platform_driver_register(&dummy_led_driver);
}

static void __exit dummy_led_exit(void)
{
    platform_driver_unregister(&dummy_led_driver);
}

module_init(dummy_led_init);
module_exit(dummy_led_exit);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Dummy LED driver");
MODULE_AUTHOR("Ian Pilcher <arequipeno@...il.com>");

-- 
========================================================================
Ian Pilcher                                         arequipeno@...il.com
Sometimes there's nothing left to do but crash and burn...or die trying.
========================================================================

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