--- /dev/null
+/*
+ * 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/kernel.h>
+#include <linux/list.h>
+#include <linux/platform_device.h>
+#include <linux/usb.h>
+#include <linux/usb/gadget.h>
+#include <linux/usb/hcd.h>
+#include <linux/kthread.h>
+#include <linux/file.h>
+#include <linux/byteorder/generic.h>
+
+#include "usbip_common.h"
+#include "vudc.h"
+
+#define VIRTUAL_ENDPOINTS (1 /* ep0 */ + 15 /* in eps */ + 15 /* out eps */)
+
+/* urb-related structures alloc / free */
+
+
+static void free_urb(struct urb *urb)
+{
+ if (!urb)
+ return;
+
+ kfree(urb->setup_packet);
+ urb->setup_packet = NULL;
+
+ kfree(urb->transfer_buffer);
+ urb->transfer_buffer = NULL;
+
+ usb_free_urb(urb);
+}
+
+struct urbp *alloc_urbp(void)
+{
+ struct urbp *urb_p;
+
+ urb_p = kzalloc(sizeof(*urb_p), GFP_KERNEL);
+ if (!urb_p)
+ return urb_p;
+
+ urb_p->urb = NULL;
+ urb_p->ep = NULL;
+ INIT_LIST_HEAD(&urb_p->urb_entry);
+ return urb_p;
+}
+
+static void free_urbp(struct urbp *urb_p)
+{
+ kfree(urb_p);
+}
+
+void free_urbp_and_urb(struct urbp *urb_p)
+{
+ if (!urb_p)
+ return;
+ free_urb(urb_p->urb);
+ free_urbp(urb_p);
+}
+
+
+/* utilities ; almost verbatim from dummy_hcd.c */
+
+/* called with spinlock held */
+static void nuke(struct vudc *udc, struct vep *ep)
+{
+ struct vrequest *req;
+
+ while (!list_empty(&ep->req_queue)) {
+ req = list_first_entry(&ep->req_queue, struct vrequest,
+ req_entry);
+ list_del_init(&req->req_entry);
+ req->req.status = -ESHUTDOWN;
+
+ spin_unlock(&udc->lock);
+ usb_gadget_giveback_request(&ep->ep, &req->req);
+ spin_lock(&udc->lock);
+ }
+}
+
+/* caller must hold lock */
+static void stop_activity(struct vudc *udc)
+{
+ int i;
+ struct urbp *urb_p, *tmp;
+
+ udc->address = 0;
+
+ for (i = 0; i < VIRTUAL_ENDPOINTS; i++)
+ nuke(udc, &udc->ep[i]);
+
+ list_for_each_entry_safe(urb_p, tmp, &udc->urb_queue, urb_entry) {
+ list_del(&urb_p->urb_entry);
+ free_urbp_and_urb(urb_p);
+ }
+}
+
+struct vep *find_endpoint(struct vudc *udc, u8 address)
+{
+ int i;
+
+ if ((address & ~USB_DIR_IN) == 0)
+ return &udc->ep[0];
+
+ for (i = 1; i < VIRTUAL_ENDPOINTS; i++) {
+ struct vep *ep = &udc->ep[i];
+
+ if (!ep->desc)
+ continue;
+ if (ep->desc->bEndpointAddress == address)
+ return ep;
+ }
+ return NULL;
+}
+
+/* gadget ops */
+
+/* FIXME - this will probably misbehave when suspend/resume is added */
+static int vgadget_get_frame(struct usb_gadget *_gadget)
+{
+ struct timeval now;
+ struct vudc *udc = usb_gadget_to_vudc(_gadget);
+
+ do_gettimeofday(&now);
+ return ((now.tv_sec - udc->start_time.tv_sec) * 1000 +
+ (now.tv_usec - udc->start_time.tv_usec) / 1000)
+ % 0x7FF;
+}
+
+static int vgadget_set_selfpowered(struct usb_gadget *_gadget, int value)
+{
+ struct vudc *udc = usb_gadget_to_vudc(_gadget);
+
+ if (value)
+ udc->devstatus |= (1 << USB_DEVICE_SELF_POWERED);
+ else
+ udc->devstatus &= ~(1 << USB_DEVICE_SELF_POWERED);
+ return 0;
+}
+
+static int vgadget_pullup(struct usb_gadget *_gadget, int value)
+{
+ struct vudc *udc = usb_gadget_to_vudc(_gadget);
+ unsigned long flags;
+ int ret;
+
+
+ spin_lock_irqsave(&udc->lock, flags);
+ value = !!value;
+ if (value == udc->pullup)
+ goto unlock;
+
+ udc->pullup = value;
+ if (value) {
+ udc->gadget.speed = min_t(u8, USB_SPEED_HIGH,
+ udc->driver->max_speed);
+ udc->ep[0].ep.maxpacket = 64;
+ /*
+ * This is the first place where we can ask our
+ * gadget driver for descriptors.
+ */
+ ret = get_gadget_descs(udc);
+ if (ret) {
+ dev_err(&udc->gadget.dev, "Unable go get desc: %d", ret);
+ goto unlock;
+ }
+
+ spin_unlock_irqrestore(&udc->lock, flags);
+ usbip_start_eh(&udc->ud);
+ } else {
+ /* Invalidate descriptors */
+ udc->desc_cached = 0;
+
+ spin_unlock_irqrestore(&udc->lock, flags);
+ usbip_event_add(&udc->ud, VUDC_EVENT_REMOVED);
+ usbip_stop_eh(&udc->ud); /* Wait for eh completion */
+ }
+
+ return 0;
+
+unlock:
+ spin_unlock_irqrestore(&udc->lock, flags);
+ return 0;
+}
+
+static int vgadget_udc_start(struct usb_gadget *g,
+ struct usb_gadget_driver *driver)
+{
+ struct vudc *udc = usb_gadget_to_vudc(g);
+ unsigned long flags;
+
+ spin_lock_irqsave(&udc->lock, flags);
+ udc->driver = driver;
+ udc->pullup = udc->connected = udc->desc_cached = 0;
+ spin_unlock_irqrestore(&udc->lock, flags);
+
+ return 0;
+}
+
+static int vgadget_udc_stop(struct usb_gadget *g)
+{
+ struct vudc *udc = usb_gadget_to_vudc(g);
+ unsigned long flags;
+
+ spin_lock_irqsave(&udc->lock, flags);
+ udc->driver = NULL;
+ spin_unlock_irqrestore(&udc->lock, flags);
+ return 0;
+}
+
+static const struct usb_gadget_ops vgadget_ops = {
+ .get_frame = vgadget_get_frame,
+ .set_selfpowered = vgadget_set_selfpowered,
+ .pullup = vgadget_pullup,
+ .udc_start = vgadget_udc_start,
+ .udc_stop = vgadget_udc_stop,
+};
+
+
+/* endpoint ops */
+
+static int vep_enable(struct usb_ep *_ep,
+ const struct usb_endpoint_descriptor *desc)
+{
+ struct vep *ep;
+ struct vudc *udc;
+ unsigned maxp;
+ unsigned long flags;
+
+ ep = to_vep(_ep);
+ udc = ep_to_vudc(ep);
+
+ if (!_ep || !desc || ep->desc || _ep->caps.type_control
+ || desc->bDescriptorType != USB_DT_ENDPOINT)
+ return -EINVAL;
+
+ if (!udc->driver)
+ return -ESHUTDOWN;
+
+ spin_lock_irqsave(&udc->lock, flags);
+
+ maxp = usb_endpoint_maxp(desc) & 0x7ff;
+ _ep->maxpacket = maxp;
+ ep->desc = desc;
+ ep->type = usb_endpoint_type(desc);
+ ep->halted = ep->wedged = 0;
+
+ spin_unlock_irqrestore(&udc->lock, flags);
+
+ return 0;
+}
+
+static int vep_disable(struct usb_ep *_ep)
+{
+ struct vep *ep;
+ struct vudc *udc;
+ unsigned long flags;
+
+ ep = to_vep(_ep);
+ udc = ep_to_vudc(ep);
+ if (!_ep || !ep->desc || _ep->caps.type_control)
+ return -EINVAL;
+
+ spin_lock_irqsave(&udc->lock, flags);
+ ep->desc = NULL;
+ nuke(udc, ep);
+ spin_unlock_irqrestore(&udc->lock, flags);
+
+ return 0;
+}
+
+static struct usb_request *vep_alloc_request(struct usb_ep *_ep,
+ gfp_t mem_flags)
+{
+ struct vep *ep;
+ struct vrequest *req;
+
+ if (!_ep)
+ return NULL;
+ ep = to_vep(_ep);
+
+ req = kzalloc(sizeof(*req), mem_flags);
+ if (!req)
+ return NULL;
+
+ INIT_LIST_HEAD(&req->req_entry);
+
+ return &req->req;
+}
+
+static void vep_free_request(struct usb_ep *_ep, struct usb_request *_req)
+{
+ struct vrequest *req;
+
+ if (!_ep || !_req) {
+ WARN_ON(1);
+ return;
+ }
+ req = to_vrequest(_req);
+ kfree(req);
+}
+
+static int vep_queue(struct usb_ep *_ep, struct usb_request *_req,
+ gfp_t mem_flags)
+{
+ struct vep *ep;
+ struct vrequest *req;
+ struct vudc *udc;
+ unsigned long flags;
+
+ if (!_ep || !_req)
+ return -EINVAL;
+
+ ep = to_vep(_ep);
+ req = to_vrequest(_req);
+ udc = ep_to_vudc(ep);
+
+ spin_lock_irqsave(&udc->lock, flags);
+ _req->actual = 0;
+ _req->status = -EINPROGRESS;
+
+ list_add_tail(&req->req_entry, &ep->req_queue);
+ spin_unlock_irqrestore(&udc->lock, flags);
+
+ return 0;
+}
+
+static int vep_dequeue(struct usb_ep *_ep, struct usb_request *_req)
+{
+ struct vep *ep;
+ struct vrequest *req;
+ struct vudc *udc;
+ struct vrequest *lst;
+ unsigned long flags;
+ int ret = -EINVAL;
+
+ if (!_ep || !_req)
+ return ret;
+
+ ep = to_vep(_ep);
+ req = to_vrequest(_req);
+ udc = req->udc;
+
+ if (!udc->driver)
+ return -ESHUTDOWN;
+
+ spin_lock_irqsave(&udc->lock, flags);
+ list_for_each_entry(lst, &ep->req_queue, req_entry) {
+ if (&lst->req == _req) {
+ list_del_init(&lst->req_entry);
+ _req->status = -ECONNRESET;
+ ret = 0;
+ break;
+ }
+ }
+ spin_unlock_irqrestore(&udc->lock, flags);
+
+ if (ret == 0)
+ usb_gadget_giveback_request(_ep, _req);
+
+ return ret;
+}
+
+static int
+vep_set_halt_and_wedge(struct usb_ep *_ep, int value, int wedged)
+{
+ struct vep *ep;
+ struct vudc *udc;
+ unsigned long flags;
+ int ret = 0;
+
+ ep = to_vep(_ep);
+ if (!_ep)
+ return -EINVAL;
+
+ udc = ep_to_vudc(ep);
+ if (!udc->driver)
+ return -ESHUTDOWN;
+
+ spin_lock_irqsave(&udc->lock, flags);
+ if (!value)
+ ep->halted = ep->wedged = 0;
+ else if (ep->desc && (ep->desc->bEndpointAddress & USB_DIR_IN) &&
+ !list_empty(&ep->req_queue))
+ ret = -EAGAIN;
+ else {
+ ep->halted = 1;
+ if (wedged)
+ ep->wedged = 1;
+ }
+
+ spin_unlock_irqrestore(&udc->lock, flags);
+ return ret;
+}
+
+static int
+vep_set_halt(struct usb_ep *_ep, int value)
+{
+ return vep_set_halt_and_wedge(_ep, value, 0);
+}
+
+static int vep_set_wedge(struct usb_ep *_ep)
+{
+ return vep_set_halt_and_wedge(_ep, 1, 1);
+}
+
+static const struct usb_ep_ops vep_ops = {
+ .enable = vep_enable,
+ .disable = vep_disable,
+
+ .alloc_request = vep_alloc_request,
+ .free_request = vep_free_request,
+
+ .queue = vep_queue,
+ .dequeue = vep_dequeue,
+
+ .set_halt = vep_set_halt,
+ .set_wedge = vep_set_wedge,
+};
+
+
+/* shutdown / reset / error handlers */
+
+static void vudc_shutdown(struct usbip_device *ud)
+{
+ struct vudc *udc = container_of(ud, struct vudc, ud);
+ int call_disconnect = 0;
+ unsigned long flags;
+
+ dev_dbg(&udc->pdev->dev, "device shutdown");
+ if (ud->tcp_socket)
+ kernel_sock_shutdown(ud->tcp_socket, SHUT_RDWR);
+
+ if (ud->tcp_tx) {
+ kthread_stop_put(ud->tcp_rx);
+ ud->tcp_rx = NULL;
+ }
+ if (ud->tcp_tx) {
+ kthread_stop_put(ud->tcp_tx);
+ ud->tcp_tx = NULL;
+ }
+
+ if (ud->tcp_socket) {
+ sockfd_put(ud->tcp_socket);
+ ud->tcp_socket = NULL;
+ }
+
+ spin_lock_irqsave(&udc->lock, flags);
+ stop_activity(udc);
+ if (udc->connected && udc->driver->disconnect)
+ call_disconnect = 1;
+ udc->connected = 0;
+ spin_unlock_irqrestore(&udc->lock, flags);
+ if (call_disconnect)
+ udc->driver->disconnect(&udc->gadget);
+}
+
+static void vudc_device_reset(struct usbip_device *ud)
+{
+ struct vudc *udc = container_of(ud, struct vudc, ud);
+ unsigned long flags;
+
+ dev_dbg(&udc->pdev->dev, "device reset");
+ spin_lock_irqsave(&udc->lock, flags);
+ stop_activity(udc);
+ spin_unlock_irqrestore(&udc->lock, flags);
+ if (udc->driver)
+ usb_gadget_udc_reset(&udc->gadget, udc->driver);
+ spin_lock_irqsave(&ud->lock, flags);
+ ud->status = SDEV_ST_AVAILABLE;
+ spin_unlock_irqrestore(&ud->lock, flags);
+}
+
+static void vudc_device_unusable(struct usbip_device *ud)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&ud->lock, flags);
+ ud->status = SDEV_ST_ERROR;
+ spin_unlock_irqrestore(&ud->lock, flags);
+}
+
+/* device setup / cleanup */
+
+struct vudc_device *alloc_vudc_device(int devid)
+{
+ struct vudc_device *udc_dev = NULL;
+
+ udc_dev = kzalloc(sizeof(*udc_dev), GFP_KERNEL);
+ if (!udc_dev)
+ goto out;
+
+ INIT_LIST_HEAD(&udc_dev->dev_entry);
+
+ udc_dev->pdev = platform_device_alloc(GADGET_NAME, devid);
+ if (!udc_dev->pdev) {
+ kfree(udc_dev);
+ udc_dev = NULL;
+ }
+
+out:
+ return udc_dev;
+}
+
+void put_vudc_device(struct vudc_device *udc_dev)
+{
+ platform_device_put(udc_dev->pdev);
+ kfree(udc_dev);
+}
+
+static int init_vudc_hw(struct vudc *udc)
+{
+ int i;
+ struct usbip_device *ud = &udc->ud;
+ struct vep *ep;
+
+ udc->ep = kcalloc(VIRTUAL_ENDPOINTS, sizeof(*udc->ep), GFP_KERNEL);
+ if (!udc->ep)
+ goto nomem_ep;
+
+ INIT_LIST_HEAD(&udc->gadget.ep_list);
+
+ /* create ep0 and 15 in, 15 out general purpose eps */
+ for (i = 0; i < VIRTUAL_ENDPOINTS; ++i) {
+ int is_out = i % 2;
+ int num = (i + 1) / 2;
+
+ ep = &udc->ep[i];
+
+ sprintf(ep->name, "ep%d%s", num,
+ i ? (is_out ? "out" : "in") : "");
+ ep->ep.name = ep->name;
+ if (i == 0) {
+ ep->ep.caps.type_control = true;
+ ep->ep.caps.dir_out = true;
+ ep->ep.caps.dir_in = true;
+ } else {
+ ep->ep.caps.type_iso = true;
+ ep->ep.caps.type_int = true;
+ ep->ep.caps.type_bulk = true;
+ }
+
+ if (is_out)
+ ep->ep.caps.dir_out = true;
+ else
+ ep->ep.caps.dir_in = true;
+
+ ep->ep.ops = &vep_ops;
+ list_add_tail(&ep->ep.ep_list, &udc->gadget.ep_list);
+ ep->halted = ep->wedged = ep->already_seen =
+ ep->setup_stage = 0;
+ usb_ep_set_maxpacket_limit(&ep->ep, ~0);
+ ep->ep.max_streams = 16;
+ ep->gadget = &udc->gadget;
+ ep->desc = NULL;
+ INIT_LIST_HEAD(&ep->req_queue);
+ }
+
+ spin_lock_init(&udc->lock);
+ spin_lock_init(&udc->lock_tx);
+ INIT_LIST_HEAD(&udc->urb_queue);
+ INIT_LIST_HEAD(&udc->tx_queue);
+ init_waitqueue_head(&udc->tx_waitq);
+
+ spin_lock_init(&ud->lock);
+ ud->status = SDEV_ST_AVAILABLE;
+ ud->side = USBIP_VUDC;
+
+ ud->eh_ops.shutdown = vudc_shutdown;
+ ud->eh_ops.reset = vudc_device_reset;
+ ud->eh_ops.unusable = vudc_device_unusable;
+
+ udc->gadget.ep0 = &udc->ep[0].ep;
+ list_del_init(&udc->ep[0].ep.ep_list);
+
+ v_init_timer(udc);
+ return 0;
+
+nomem_ep:
+ return -ENOMEM;
+}
+
+static void cleanup_vudc_hw(struct vudc *udc)
+{
+ kfree(udc->ep);
+}
+
+/* platform driver ops */
+
+int vudc_probe(struct platform_device *pdev)
+{
+ struct vudc *udc;
+ int ret = -ENOMEM;
+
+ udc = kzalloc(sizeof(*udc), GFP_KERNEL);
+ if (!udc)
+ goto out;
+
+ udc->gadget.name = GADGET_NAME;
+ udc->gadget.ops = &vgadget_ops;
+ udc->gadget.max_speed = USB_SPEED_HIGH;
+ udc->gadget.dev.parent = &pdev->dev;
+ udc->pdev = pdev;
+
+ ret = init_vudc_hw(udc);
+ if (ret)
+ goto err_init_vudc_hw;
+
+ ret = usb_add_gadget_udc(&pdev->dev, &udc->gadget);
+ if (ret < 0)
+ goto err_add_udc;
+
+ ret = sysfs_create_group(&pdev->dev.kobj, &vudc_attr_group);
+ if (ret) {
+ dev_err(&udc->pdev->dev, "create sysfs files\n");
+ goto err_sysfs;
+ }
+
+ platform_set_drvdata(pdev, udc);
+
+ return ret;
+
+err_sysfs:
+ usb_del_gadget_udc(&udc->gadget);
+err_add_udc:
+ cleanup_vudc_hw(udc);
+err_init_vudc_hw:
+ kfree(udc);
+out:
+ return ret;
+}
+
+int vudc_remove(struct platform_device *pdev)
+{
+ struct vudc *udc = platform_get_drvdata(pdev);
+
+ sysfs_remove_group(&pdev->dev.kobj, &vudc_attr_group);
+ usb_del_gadget_udc(&udc->gadget);
+ cleanup_vudc_hw(udc);
+ kfree(udc);
+ return 0;
+}
projects / linux-beck.git / commitdiff