usbip: vudc: Add VUDC main file

/*

 * Copyright (C) 2015 Karol Kosik <karo9@interia.eu>

 * Copyright (C) 2015-2016 Samsung Electronics

 *               Igor Kotrasinski <i.kotrasinsk@samsung.com>

 *               Krzysztof Opasiak <k.opasiak@samsung.com>

 *

 * 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, see <http://www.gnu.org/licenses/>.

 */

#include <linux/device.h>

#include <linux/list.h>

#include <linux/module.h>

#include "vudc.h"

static unsigned int vudc_number = 1;

module_param_named(num, vudc_number, uint, S_IRUGO);

MODULE_PARM_DESC(num, "number of emulated controllers");

static struct platform_driver vudc_driver = {

	.probe		= vudc_probe,

	.remove		= vudc_remove,

	.driver		= {

		.name	= GADGET_NAME,

	},

};

static struct list_head vudc_devices = LIST_HEAD_INIT(vudc_devices);

static int __init init(void)

{

	int retval = -ENOMEM;

	int i;

	struct vudc_device *udc_dev = NULL, *udc_dev2 = NULL;

	if (usb_disabled())

		return -ENODEV;

	if (vudc_number < 1) {

		pr_err("Number of emulated UDC must be no less than 1");

		return -EINVAL;

	}

	retval = platform_driver_register(&vudc_driver);

	if (retval < 0)

		goto out;

	for (i = 0; i < vudc_number; i++) {

		udc_dev = alloc_vudc_device(i);

		if (!udc_dev) {

			retval = -ENOMEM;

			goto cleanup;

		}

		retval = platform_device_add(udc_dev->pdev);

		if (retval < 0) {

			put_vudc_device(udc_dev);

			goto cleanup;

		}

		list_add_tail(&udc_dev->dev_entry, &vudc_devices);

		if (!platform_get_drvdata(udc_dev->pdev)) {

			/*

			 * The udc was added successfully but its probe

			 * function failed for some reason.

			 */

			retval = -EINVAL;

			goto cleanup;

		}

	}

	goto out;

cleanup:

	list_for_each_entry_safe(udc_dev, udc_dev2, &vudc_devices, dev_entry) {

		list_del(&udc_dev->dev_entry);

		platform_device_del(udc_dev->pdev);

		put_vudc_device(udc_dev);

	}

	platform_driver_unregister(&vudc_driver);

out:

	return retval;

}

module_init(init);

static void __exit cleanup(void)

{

	struct vudc_device *udc_dev = NULL, *udc_dev2 = NULL;

	list_for_each_entry_safe(udc_dev, udc_dev2, &vudc_devices, dev_entry) {

		list_del(&udc_dev->dev_entry);

		platform_device_unregister(udc_dev->pdev);

		put_vudc_device(udc_dev);

	}

	platform_driver_unregister(&vudc_driver);

}

module_exit(cleanup);

MODULE_DESCRIPTION("USB over IP Device Controller");

MODULE_AUTHOR("Krzysztof Opasiak, Karol Kosik, Igor Kotrasinski");

MODULE_LICENSE("GPL");