From: Igor Kotrasinski <i.kotrasinsk@xxxxxxxxxxx>
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@xxxxxxxxx>
Karol Kosik <karo9@xxxxxxxxxx>
Ewelina Kosmider <3w3lfin@xxxxxxxxx>
Dawid Lazarczyk <lazarczyk.dawid@xxxxxxxxx>
Piotr Szulc <ps347277@xxxxxxxxxxxxxxxxxxxxx>
Tutor and project owner:
Krzysztof Opasiak <k.opasiak@xxxxxxxxxxx>
Signed-off-by: Igor Kotrasinski <i.kotrasinsk@xxxxxxxxxxx>
Signed-off-by: Karol Kosik <karo9@xxxxxxxxxx>
[Various bug fixes, improvements and commit msg update]
Signed-off-by: Krzysztof Opasiak <k.opasiak@xxxxxxxxxxx>
---
drivers/usb/usbip/vudc_sysfs.c | 221 ++++++++++++++++++++++++++++++++++++++++
1 file changed, 221 insertions(+)
create mode 100644 drivers/usb/usbip/vudc_sysfs.c
diff --git a/drivers/usb/usbip/vudc_sysfs.c b/drivers/usb/usbip/vudc_sysfs.c
new file mode 100644
index 0000000..25ca16a
--- /dev/null
+++ b/drivers/usb/usbip/vudc_sysfs.c
@@ -0,0 +1,221 @@
+/*
+ * Copyright (C) 2015 Karol Kosik <karo9@xxxxxxxxxx>
+ * Copyright (C) 2015-2016 Samsung Electronics
+ * Igor Kotrasinski <i.kotrasinsk@xxxxxxxxxxx>
+ * Krzysztof Opasiak <k.opasiak@xxxxxxxxxxx>
+ *
+ * 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,
+};
--
1.7.9.5
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