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usbip: vudc: Add VUDC main file

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Add main vudc module file. This allows us to register suitable
platform device and driver (just like dummy_hcd does).

Currently number of vudc instances is determined using module
parameter but whole infrastructure is suitable to make vudc
creation dynamic (for example via configfs).

This commit is a result of cooperation between Samsung R&D Institute
Poland and Open Operating Systems Student Society at University
of Warsaw (O2S3@UW) consisting of:

    Igor Kotrasinski <ikotrasinsk@gmail.com>
    Karol Kosik <karo9@interia.eu>
    Ewelina Kosmider <3w3lfin@gmail.com>
    Dawid Lazarczyk <lazarczyk.dawid@gmail.com>
    Piotr Szulc <ps347277@students.mimuw.edu.pl>

Tutor and project owner:
    Krzysztof Opasiak <k.opasiak@samsung.com>

Signed-off-by: Igor Kotrasinski <i.kotrasinsk@samsung.com>
Signed-off-by: Karol Kosik <karo9@interia.eu>
[Various bug fixes and commit message update]
Signed-off-by: Krzysztof Opasiak <k.opasiak@samsung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Igor Kotrasinski 2016-03-08 21:48:58 +01:00 committed by Greg Kroah-Hartman
parent c7af4c2218
commit 80fd9cd52d
1 changed files with 113 additions and 0 deletions
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113
drivers/usb/usbip/vudc_main.c Normal file
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/*
* 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");