Commit ea6873a4 authored by Igor Kotrasinski's avatar Igor Kotrasinski Committed by Greg Kroah-Hartman

usbip: vudc: Add SysFS infrastructure for VUDC

Add sysfs attributes to allow controlling vudc from usbip tools.

dev_desc - device descriptor of current gadget. This is required to
	 be consisten with current usbip protocol and allow to list
	 exportable devices on given machine.

usbip_sockfd - allows to pass socket to kernel to start usbip transfer.

usbip_status - currnent status of device

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: default avatarIgor Kotrasinski <i.kotrasinsk@samsung.com>
Signed-off-by: default avatarKarol Kosik <karo9@interia.eu>
[Various bug fixes, improvements and commit msg update]
Signed-off-by: default avatarKrzysztof Opasiak <k.opasiak@samsung.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent b6a0ca11
/*
* 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/usb/gadget.h>
#include <linux/usb/ch9.h>
#include <linux/sysfs.h>
#include <linux/kthread.h>
#include <linux/byteorder/generic.h>
#include "usbip_common.h"
#include "vudc.h"
#include <net/sock.h>
/* called with udc->lock held */
int get_gadget_descs(struct vudc *udc)
{
struct vrequest *usb_req;
struct vep *ep0 = to_vep(udc->gadget.ep0);
struct usb_device_descriptor *ddesc = &udc->dev_desc;
struct usb_ctrlrequest req;
int ret;
if (!udc || !udc->driver || !udc->pullup)
return -EINVAL;
req.bRequestType = USB_DIR_IN | USB_TYPE_STANDARD | USB_RECIP_DEVICE;
req.bRequest = USB_REQ_GET_DESCRIPTOR;
req.wValue = cpu_to_le16(USB_DT_DEVICE << 8);
req.wIndex = cpu_to_le16(0);
req.wLength = cpu_to_le16(sizeof(*ddesc));
spin_unlock(&udc->lock);
ret = udc->driver->setup(&(udc->gadget), &req);
spin_lock(&udc->lock);
if (ret < 0)
goto out;
/* assuming request queue is empty; request is now on top */
usb_req = list_last_entry(&ep0->req_queue, struct vrequest, req_entry);
list_del(&usb_req->req_entry);
if (usb_req->req.length > sizeof(*ddesc)) {
ret = -EOVERFLOW;
goto giveback_req;
}
memcpy(ddesc, usb_req->req.buf, sizeof(*ddesc));
udc->desc_cached = 1;
ret = 0;
giveback_req:
usb_req->req.status = 0;
usb_req->req.actual = usb_req->req.length;
usb_gadget_giveback_request(&(ep0->ep), &(usb_req->req));
out:
return ret;
}
/*
* Exposes device descriptor from the gadget driver.
*/
static ssize_t dev_desc_show(struct device *dev,
struct device_attribute *attr, char *out)
{
struct vudc *udc = (struct vudc *)dev_get_drvdata(dev);
unsigned long flags;
int ret;
spin_lock_irqsave(&udc->lock, flags);
if (!udc->desc_cached) {
ret = -ENODEV;
goto unlock;
}
memcpy(out, &udc->dev_desc, sizeof(udc->dev_desc));
ret = sizeof(udc->dev_desc);
unlock:
spin_unlock_irqrestore(&udc->lock, flags);
return ret;
}
static DEVICE_ATTR_RO(dev_desc);
static ssize_t store_sockfd(struct device *dev, struct device_attribute *attr,
const char *in, size_t count)
{
struct vudc *udc = (struct vudc *) dev_get_drvdata(dev);
int rv;
int sockfd = 0;
int err;
struct socket *socket;
unsigned long flags;
int ret;
rv = kstrtoint(in, 0, &sockfd);
if (rv != 0)
return -EINVAL;
spin_lock_irqsave(&udc->lock, flags);
/* Don't export what we don't have */
if (!udc || !udc->driver || !udc->pullup) {
dev_err(dev, "no device or gadget not bound");
ret = -ENODEV;
goto unlock;
}
if (sockfd != -1) {
if (udc->connected) {
dev_err(dev, "Device already connected");
ret = -EBUSY;
goto unlock;
}
spin_lock_irq(&udc->ud.lock);
if (udc->ud.status != SDEV_ST_AVAILABLE) {
ret = -EINVAL;
goto unlock_ud;
}
socket = sockfd_lookup(sockfd, &err);
if (!socket) {
dev_err(dev, "failed to lookup sock");
ret = -EINVAL;
goto unlock_ud;
}
udc->ud.tcp_socket = socket;
spin_unlock_irq(&udc->ud.lock);
spin_unlock_irqrestore(&udc->lock, flags);
udc->ud.tcp_rx = kthread_get_run(&v_rx_loop,
&udc->ud, "vudc_rx");
udc->ud.tcp_tx = kthread_get_run(&v_tx_loop,
&udc->ud, "vudc_tx");
spin_lock_irqsave(&udc->lock, flags);
spin_lock_irq(&udc->ud.lock);
udc->ud.status = SDEV_ST_USED;
spin_unlock_irq(&udc->ud.lock);
do_gettimeofday(&udc->start_time);
v_start_timer(udc);
udc->connected = 1;
} else {
if (!udc->connected) {
dev_err(dev, "Device not connected");
ret = -EINVAL;
goto unlock;
}
spin_lock_irq(&udc->ud.lock);
if (udc->ud.status != SDEV_ST_USED) {
ret = -EINVAL;
goto unlock_ud;
}
spin_unlock_irq(&udc->ud.lock);
usbip_event_add(&udc->ud, VUDC_EVENT_DOWN);
}
spin_unlock_irqrestore(&udc->lock, flags);
return count;
unlock_ud:
spin_unlock_irq(&udc->ud.lock);
unlock:
spin_unlock_irqrestore(&udc->lock, flags);
return ret;
}
static DEVICE_ATTR(usbip_sockfd, S_IWUSR, NULL, store_sockfd);
static ssize_t usbip_status_show(struct device *dev,
struct device_attribute *attr, char *out)
{
struct vudc *udc = (struct vudc *) dev_get_drvdata(dev);
int status;
if (!udc) {
dev_err(&udc->pdev->dev, "no device");
return -ENODEV;
}
spin_lock_irq(&udc->ud.lock);
status = udc->ud.status;
spin_unlock_irq(&udc->ud.lock);
return snprintf(out, PAGE_SIZE, "%d\n", status);
}
static DEVICE_ATTR_RO(usbip_status);
static struct attribute *dev_attrs[] = {
&dev_attr_dev_desc.attr,
&dev_attr_usbip_sockfd.attr,
&dev_attr_usbip_status.attr,
NULL,
};
const struct attribute_group vudc_attr_group = {
.attrs = dev_attrs,
};
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