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: Igor Kotrasinski <i.kotrasinsk@samsung.com>
Signed-off-by: Karol Kosik <karo9@interia.eu>
[Various bug fixes, improvements and commit msg 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
Greg Kroah-Hartman
parent
b6a0ca1118
commit
ea6873a45a
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/*
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* Copyright (C) 2015 Karol Kosik <karo9@interia.eu>
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* Copyright (C) 2015-2016 Samsung Electronics
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* Igor Kotrasinski <i.kotrasinsk@samsung.com>
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* Krzysztof Opasiak <k.opasiak@samsung.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <linux/device.h>
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#include <linux/list.h>
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#include <linux/usb/gadget.h>
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#include <linux/usb/ch9.h>
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#include <linux/sysfs.h>
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#include <linux/kthread.h>
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#include <linux/byteorder/generic.h>
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#include "usbip_common.h"
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#include "vudc.h"
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#include <net/sock.h>
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/* called with udc->lock held */
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int get_gadget_descs(struct vudc *udc)
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{
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struct vrequest *usb_req;
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struct vep *ep0 = to_vep(udc->gadget.ep0);
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struct usb_device_descriptor *ddesc = &udc->dev_desc;
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struct usb_ctrlrequest req;
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int ret;
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if (!udc || !udc->driver || !udc->pullup)
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return -EINVAL;
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req.bRequestType = USB_DIR_IN | USB_TYPE_STANDARD | USB_RECIP_DEVICE;
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req.bRequest = USB_REQ_GET_DESCRIPTOR;
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req.wValue = cpu_to_le16(USB_DT_DEVICE << 8);
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req.wIndex = cpu_to_le16(0);
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req.wLength = cpu_to_le16(sizeof(*ddesc));
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spin_unlock(&udc->lock);
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ret = udc->driver->setup(&(udc->gadget), &req);
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spin_lock(&udc->lock);
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if (ret < 0)
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goto out;
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/* assuming request queue is empty; request is now on top */
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usb_req = list_last_entry(&ep0->req_queue, struct vrequest, req_entry);
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list_del(&usb_req->req_entry);
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if (usb_req->req.length > sizeof(*ddesc)) {
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ret = -EOVERFLOW;
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goto giveback_req;
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}
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memcpy(ddesc, usb_req->req.buf, sizeof(*ddesc));
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udc->desc_cached = 1;
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ret = 0;
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giveback_req:
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usb_req->req.status = 0;
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usb_req->req.actual = usb_req->req.length;
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usb_gadget_giveback_request(&(ep0->ep), &(usb_req->req));
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out:
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return ret;
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}
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/*
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* Exposes device descriptor from the gadget driver.
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*/
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static ssize_t dev_desc_show(struct device *dev,
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struct device_attribute *attr, char *out)
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{
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struct vudc *udc = (struct vudc *)dev_get_drvdata(dev);
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unsigned long flags;
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int ret;
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spin_lock_irqsave(&udc->lock, flags);
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if (!udc->desc_cached) {
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ret = -ENODEV;
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goto unlock;
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}
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memcpy(out, &udc->dev_desc, sizeof(udc->dev_desc));
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ret = sizeof(udc->dev_desc);
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unlock:
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spin_unlock_irqrestore(&udc->lock, flags);
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return ret;
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}
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static DEVICE_ATTR_RO(dev_desc);
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static ssize_t store_sockfd(struct device *dev, struct device_attribute *attr,
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const char *in, size_t count)
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{
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struct vudc *udc = (struct vudc *) dev_get_drvdata(dev);
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int rv;
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int sockfd = 0;
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int err;
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struct socket *socket;
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unsigned long flags;
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int ret;
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rv = kstrtoint(in, 0, &sockfd);
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if (rv != 0)
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return -EINVAL;
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spin_lock_irqsave(&udc->lock, flags);
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/* Don't export what we don't have */
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if (!udc || !udc->driver || !udc->pullup) {
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dev_err(dev, "no device or gadget not bound");
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ret = -ENODEV;
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goto unlock;
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}
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if (sockfd != -1) {
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if (udc->connected) {
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dev_err(dev, "Device already connected");
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ret = -EBUSY;
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goto unlock;
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}
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spin_lock_irq(&udc->ud.lock);
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if (udc->ud.status != SDEV_ST_AVAILABLE) {
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ret = -EINVAL;
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goto unlock_ud;
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}
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socket = sockfd_lookup(sockfd, &err);
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if (!socket) {
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dev_err(dev, "failed to lookup sock");
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ret = -EINVAL;
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goto unlock_ud;
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}
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udc->ud.tcp_socket = socket;
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spin_unlock_irq(&udc->ud.lock);
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spin_unlock_irqrestore(&udc->lock, flags);
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udc->ud.tcp_rx = kthread_get_run(&v_rx_loop,
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&udc->ud, "vudc_rx");
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udc->ud.tcp_tx = kthread_get_run(&v_tx_loop,
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&udc->ud, "vudc_tx");
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spin_lock_irqsave(&udc->lock, flags);
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spin_lock_irq(&udc->ud.lock);
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udc->ud.status = SDEV_ST_USED;
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spin_unlock_irq(&udc->ud.lock);
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do_gettimeofday(&udc->start_time);
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v_start_timer(udc);
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udc->connected = 1;
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} else {
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if (!udc->connected) {
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dev_err(dev, "Device not connected");
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ret = -EINVAL;
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goto unlock;
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}
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spin_lock_irq(&udc->ud.lock);
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if (udc->ud.status != SDEV_ST_USED) {
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ret = -EINVAL;
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goto unlock_ud;
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}
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spin_unlock_irq(&udc->ud.lock);
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usbip_event_add(&udc->ud, VUDC_EVENT_DOWN);
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}
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spin_unlock_irqrestore(&udc->lock, flags);
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return count;
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unlock_ud:
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spin_unlock_irq(&udc->ud.lock);
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unlock:
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spin_unlock_irqrestore(&udc->lock, flags);
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return ret;
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}
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static DEVICE_ATTR(usbip_sockfd, S_IWUSR, NULL, store_sockfd);
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static ssize_t usbip_status_show(struct device *dev,
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struct device_attribute *attr, char *out)
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{
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struct vudc *udc = (struct vudc *) dev_get_drvdata(dev);
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int status;
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if (!udc) {
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dev_err(&udc->pdev->dev, "no device");
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return -ENODEV;
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}
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spin_lock_irq(&udc->ud.lock);
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status = udc->ud.status;
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spin_unlock_irq(&udc->ud.lock);
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return snprintf(out, PAGE_SIZE, "%d\n", status);
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}
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static DEVICE_ATTR_RO(usbip_status);
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static struct attribute *dev_attrs[] = {
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&dev_attr_dev_desc.attr,
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&dev_attr_usbip_sockfd.attr,
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&dev_attr_usbip_status.attr,
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NULL,
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};
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const struct attribute_group vudc_attr_group = {
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.attrs = dev_attrs,
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};
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