drivers/usb/usbip/vhci_hcd.c

   1 /*
   2  * Copyright (C) 2003-2008 Takahiro Hirofuchi
   3  * Copyright (C) 2015-2016 Nobuo Iwata
   4  *
   5  * This is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
  18  * USA.
  19  */
  20
  21 #include <linux/init.h>
  22 #include <linux/file.h>
  23 #include <linux/kernel.h>
  24 #include <linux/kthread.h>
  25 #include <linux/module.h>
  26 #include <linux/platform_device.h>
  27 #include <linux/slab.h>
  28
  29 #include "usbip_common.h"
  30 #include "vhci.h"
  31
  32 #define DRIVER_AUTHOR "Takahiro Hirofuchi"
  33 #define DRIVER_DESC "USB/IP 'Virtual' Host Controller (VHCI) Driver"
  34
  35 /*
  36  * TODO
  37  *      - update root hub emulation
  38  *      - move the emulation code to userland ?
  39  *              porting to other operating systems
  40  *              minimize kernel code
  41  *      - add suspend/resume code
  42  *      - clean up everything
  43  */
  44
  45 /* See usb gadget dummy hcd */
  46
  47 static int vhci_hub_status(struct usb_hcd *hcd, char *buff);
  48 static int vhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
  49                             u16 wIndex, char *buff, u16 wLength);
  50 static int vhci_urb_enqueue(struct usb_hcd *hcd, struct urb *urb,
  51                             gfp_t mem_flags);
  52 static int vhci_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status);
  53 static int vhci_start(struct usb_hcd *vhci_hcd);
  54 static void vhci_stop(struct usb_hcd *hcd);
  55 static int vhci_get_frame_number(struct usb_hcd *hcd);
  56
  57 static const char driver_name[] = "vhci_hcd";
  58 static const char driver_desc[] = "USB/IP Virtual Host Controller";
  59
  60 int vhci_num_controllers = VHCI_NR_HCS;
  61
  62 struct platform_device **vhci_pdevs;
  63
  64 static const char * const bit_desc[] = {
  65         "CONNECTION",           /*0*/
  66         "ENABLE",               /*1*/
  67         "SUSPEND",              /*2*/
  68         "OVER_CURRENT",         /*3*/
  69         "RESET",                /*4*/
  70         "R5",                   /*5*/
  71         "R6",                   /*6*/
  72         "R7",                   /*7*/
  73         "POWER",                /*8*/
  74         "LOWSPEED",             /*9*/
  75         "HIGHSPEED",            /*10*/
  76         "PORT_TEST",            /*11*/
  77         "INDICATOR",            /*12*/
  78         "R13",                  /*13*/
  79         "R14",                  /*14*/
  80         "R15",                  /*15*/
  81         "C_CONNECTION",         /*16*/
  82         "C_ENABLE",             /*17*/
  83         "C_SUSPEND",            /*18*/
  84         "C_OVER_CURRENT",       /*19*/
  85         "C_RESET",              /*20*/
  86         "R21",                  /*21*/
  87         "R22",                  /*22*/
  88         "R23",                  /*23*/
  89         "R24",                  /*24*/
  90         "R25",                  /*25*/
  91         "R26",                  /*26*/
  92         "R27",                  /*27*/
  93         "R28",                  /*28*/
  94         "R29",                  /*29*/
  95         "R30",                  /*30*/
  96         "R31",                  /*31*/
  97 };
  98
  99 static void dump_port_status_diff(u32 prev_status, u32 new_status)
 100 {
 101         int i = 0;
 102         u32 bit = 1;
 103
 104         pr_debug("status prev -> new: %08x -> %08x\n", prev_status, new_status);
 105         while (bit) {
 106                 u32 prev = prev_status & bit;
 107                 u32 new = new_status & bit;
 108                 char change;
 109
 110                 if (!prev && new)
 111                         change = '+';
 112                 else if (prev && !new)
 113                         change = '-';
 114                 else
 115                         change = ' ';
 116
 117                 if (prev || new)
 118                         pr_debug(" %c%s\n", change, bit_desc[i]);
 119                 bit <<= 1;
 120                 i++;
 121         }
 122         pr_debug("\n");
 123 }
 124
 125 void rh_port_connect(struct vhci_device *vdev, enum usb_device_speed speed)
 126 {
 127         struct vhci_hcd *vhci = vdev_to_vhci(vdev);
 128         int             rhport = vdev->rhport;
 129         u32             status;
 130         unsigned long   flags;
 131
 132         usbip_dbg_vhci_rh("rh_port_connect %d\n", rhport);
 133
 134         spin_lock_irqsave(&vhci->lock, flags);
 135
 136         status = vhci->port_status[rhport];
 137
 138         status |= USB_PORT_STAT_CONNECTION | (1 << USB_PORT_FEAT_C_CONNECTION);
 139
 140         switch (speed) {
 141         case USB_SPEED_HIGH:
 142                 status |= USB_PORT_STAT_HIGH_SPEED;
 143                 break;
 144         case USB_SPEED_LOW:
 145                 status |= USB_PORT_STAT_LOW_SPEED;
 146                 break;
 147         default:
 148                 break;
 149         }
 150
 151         vhci->port_status[rhport] = status;
 152
 153         spin_unlock_irqrestore(&vhci->lock, flags);
 154
 155         usb_hcd_poll_rh_status(vhci_to_hcd(vhci));
 156 }
 157
 158 static void rh_port_disconnect(struct vhci_device *vdev)
 159 {
 160         struct vhci_hcd *vhci = vdev_to_vhci(vdev);
 161         int             rhport = vdev->rhport;
 162         u32             status;
 163         unsigned long   flags;
 164
 165         usbip_dbg_vhci_rh("rh_port_disconnect %d\n", rhport);
 166
 167         spin_lock_irqsave(&vhci->lock, flags);
 168
 169         status = vhci->port_status[rhport];
 170
 171         status &= ~USB_PORT_STAT_CONNECTION;
 172         status |= (1 << USB_PORT_FEAT_C_CONNECTION);
 173
 174         vhci->port_status[rhport] = status;
 175
 176         spin_unlock_irqrestore(&vhci->lock, flags);
 177         usb_hcd_poll_rh_status(vhci_to_hcd(vhci));
 178 }
 179
 180 #define PORT_C_MASK                             \
 181         ((USB_PORT_STAT_C_CONNECTION            \
 182           | USB_PORT_STAT_C_ENABLE              \
 183           | USB_PORT_STAT_C_SUSPEND             \
 184           | USB_PORT_STAT_C_OVERCURRENT         \
 185           | USB_PORT_STAT_C_RESET) << 16)
 186
 187 /*
 188  * Returns 0 if the status hasn't changed, or the number of bytes in buf.
 189  * Ports are 0-indexed from the HCD point of view,
 190  * and 1-indexed from the USB core pointer of view.
 191  *
 192  * @buf: a bitmap to show which port status has been changed.
 193  *  bit  0: reserved
 194  *  bit  1: the status of port 0 has been changed.
 195  *  bit  2: the status of port 1 has been changed.
 196  *  ...
 197  */
 198 static int vhci_hub_status(struct usb_hcd *hcd, char *buf)
 199 {
 200         struct vhci_hcd *vhci;
 201         int             retval;
 202         int             rhport;
 203         int             changed = 0;
 204         unsigned long   flags;
 205
 206         retval = DIV_ROUND_UP(VHCI_HC_PORTS + 1, 8);
 207         memset(buf, 0, retval);
 208
 209         vhci = hcd_to_vhci(hcd);
 210
 211         spin_lock_irqsave(&vhci->lock, flags);
 212         if (!HCD_HW_ACCESSIBLE(hcd)) {
 213                 usbip_dbg_vhci_rh("hw accessible flag not on?\n");
 214                 goto done;
 215         }
 216
 217         /* check pseudo status register for each port */
 218         for (rhport = 0; rhport < VHCI_HC_PORTS; rhport++) {
 219                 if ((vhci->port_status[rhport] & PORT_C_MASK)) {
 220                         /* The status of a port has been changed, */
 221                         usbip_dbg_vhci_rh("port %d status changed\n", rhport);
 222
 223                         buf[(rhport + 1) / 8] |= 1 << (rhport + 1) % 8;
 224                         changed = 1;
 225                 }
 226         }
 227
 228         if ((hcd->state == HC_STATE_SUSPENDED) && (changed == 1))
 229                 usb_hcd_resume_root_hub(hcd);
 230
 231 done:
 232         spin_unlock_irqrestore(&vhci->lock, flags);
 233         return changed ? retval : 0;
 234 }
 235
 236 static inline void hub_descriptor(struct usb_hub_descriptor *desc)
 237 {
 238         int width;
 239
 240         memset(desc, 0, sizeof(*desc));
 241         desc->bDescriptorType = USB_DT_HUB;
 242         desc->wHubCharacteristics = cpu_to_le16(
 243                 HUB_CHAR_INDV_PORT_LPSM | HUB_CHAR_COMMON_OCPM);
 244
 245         desc->bNbrPorts = VHCI_HC_PORTS;
 246         BUILD_BUG_ON(VHCI_HC_PORTS > USB_MAXCHILDREN);
 247         width = desc->bNbrPorts / 8 + 1;
 248         desc->bDescLength = USB_DT_HUB_NONVAR_SIZE + 2 * width;
 249         memset(&desc->u.hs.DeviceRemovable[0], 0, width);
 250         memset(&desc->u.hs.DeviceRemovable[width], 0xff, width);
 251 }
 252
 253 static int vhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
 254                             u16 wIndex, char *buf, u16 wLength)
 255 {
 256         struct vhci_hcd *dum;
 257         int             retval = 0;
 258         int             rhport;
 259         unsigned long   flags;
 260
 261         u32 prev_port_status[VHCI_HC_PORTS];
 262
 263         if (!HCD_HW_ACCESSIBLE(hcd))
 264                 return -ETIMEDOUT;
 265
 266         /*
 267          * NOTE:
 268          * wIndex shows the port number and begins from 1.
 269          */
 270         usbip_dbg_vhci_rh("typeReq %x wValue %x wIndex %x\n", typeReq, wValue,
 271                           wIndex);
 272         if (wIndex > VHCI_HC_PORTS)
 273                 pr_err("invalid port number %d\n", wIndex);
 274         rhport = ((__u8)(wIndex & 0x00ff)) - 1;
 275
 276         dum = hcd_to_vhci(hcd);
 277
 278         spin_lock_irqsave(&dum->lock, flags);
 279
 280         /* store old status and compare now and old later */
 281         if (usbip_dbg_flag_vhci_rh) {
 282                 memcpy(prev_port_status, dum->port_status,
 283                         sizeof(prev_port_status));
 284         }
 285
 286         switch (typeReq) {
 287         case ClearHubFeature:
 288                 usbip_dbg_vhci_rh(" ClearHubFeature\n");
 289                 break;
 290         case ClearPortFeature:
 291                 switch (wValue) {
 292                 case USB_PORT_FEAT_SUSPEND:
 293                         if (dum->port_status[rhport] & USB_PORT_STAT_SUSPEND) {
 294                                 /* 20msec signaling */
 295                                 dum->resuming = 1;
 296                                 dum->re_timeout =
 297                                         jiffies + msecs_to_jiffies(20);
 298                         }
 299                         break;
 300                 case USB_PORT_FEAT_POWER:
 301                         usbip_dbg_vhci_rh(
 302                                 " ClearPortFeature: USB_PORT_FEAT_POWER\n");
 303                         dum->port_status[rhport] &= ~USB_PORT_STAT_POWER;
 304                         dum->resuming = 0;
 305                         break;
 306                 case USB_PORT_FEAT_C_RESET:
 307                         usbip_dbg_vhci_rh(
 308                                 " ClearPortFeature: USB_PORT_FEAT_C_RESET\n");
 309                         switch (dum->vdev[rhport].speed) {
 310                         case USB_SPEED_HIGH:
 311                                 dum->port_status[rhport] |=
 312                                         USB_PORT_STAT_HIGH_SPEED;
 313                                 break;
 314                         case USB_SPEED_LOW:
 315                                 dum->port_status[rhport] |=
 316                                         USB_PORT_STAT_LOW_SPEED;
 317                                 break;
 318                         default:
 319                                 break;
 320                         }
 321                         break;
 322                 default:
 323                         usbip_dbg_vhci_rh(" ClearPortFeature: default %x\n",
 324                                           wValue);
 325                         dum->port_status[rhport] &= ~(1 << wValue);
 326                         break;
 327                 }
 328                 break;
 329         case GetHubDescriptor:
 330                 usbip_dbg_vhci_rh(" GetHubDescriptor\n");
 331                 hub_descriptor((struct usb_hub_descriptor *) buf);
 332                 break;
 333         case GetHubStatus:
 334                 usbip_dbg_vhci_rh(" GetHubStatus\n");
 335                 *(__le32 *) buf = cpu_to_le32(0);
 336                 break;
 337         case GetPortStatus:
 338                 usbip_dbg_vhci_rh(" GetPortStatus port %x\n", wIndex);
 339                 if (wIndex > VHCI_HC_PORTS || wIndex < 1) {
 340                         pr_err("invalid port number %d\n", wIndex);
 341                         retval = -EPIPE;
 342                 }
 343
 344                 /* we do not care about resume. */
 345
 346                 /* whoever resets or resumes must GetPortStatus to
 347                  * complete it!!
 348                  */
 349                 if (dum->resuming && time_after(jiffies, dum->re_timeout)) {
 350                         dum->port_status[rhport] |=
 351                                 (1 << USB_PORT_FEAT_C_SUSPEND);
 352                         dum->port_status[rhport] &=
 353                                 ~(1 << USB_PORT_FEAT_SUSPEND);
 354                         dum->resuming = 0;
 355                         dum->re_timeout = 0;
 356                 }
 357
 358                 if ((dum->port_status[rhport] & (1 << USB_PORT_FEAT_RESET)) !=
 359                     0 && time_after(jiffies, dum->re_timeout)) {
 360                         dum->port_status[rhport] |=
 361                                 (1 << USB_PORT_FEAT_C_RESET);
 362                         dum->port_status[rhport] &=
 363                                 ~(1 << USB_PORT_FEAT_RESET);
 364                         dum->re_timeout = 0;
 365
 366                         if (dum->vdev[rhport].ud.status ==
 367                             VDEV_ST_NOTASSIGNED) {
 368                                 usbip_dbg_vhci_rh(
 369                                         " enable rhport %d (status %u)\n",
 370                                         rhport,
 371                                         dum->vdev[rhport].ud.status);
 372                                 dum->port_status[rhport] |=
 373                                         USB_PORT_STAT_ENABLE;
 374                         }
 375                 }
 376                 ((__le16 *) buf)[0] = cpu_to_le16(dum->port_status[rhport]);
 377                 ((__le16 *) buf)[1] =
 378                         cpu_to_le16(dum->port_status[rhport] >> 16);
 379
 380                 usbip_dbg_vhci_rh(" GetPortStatus bye %x %x\n", ((u16 *)buf)[0],
 381                                   ((u16 *)buf)[1]);
 382                 break;
 383         case SetHubFeature:
 384                 usbip_dbg_vhci_rh(" SetHubFeature\n");
 385                 retval = -EPIPE;
 386                 break;
 387         case SetPortFeature:
 388                 switch (wValue) {
 389                 case USB_PORT_FEAT_SUSPEND:
 390                         usbip_dbg_vhci_rh(
 391                                 " SetPortFeature: USB_PORT_FEAT_SUSPEND\n");
 392                         break;
 393                 case USB_PORT_FEAT_RESET:
 394                         usbip_dbg_vhci_rh(
 395                                 " SetPortFeature: USB_PORT_FEAT_RESET\n");
 396                         /* if it's already running, disconnect first */
 397                         if (dum->port_status[rhport] & USB_PORT_STAT_ENABLE) {
 398                                 dum->port_status[rhport] &=
 399                                         ~(USB_PORT_STAT_ENABLE |
 400                                           USB_PORT_STAT_LOW_SPEED |
 401                                           USB_PORT_STAT_HIGH_SPEED);
 402                                 /* FIXME test that code path! */
 403                         }
 404                         /* 50msec reset signaling */
 405                         dum->re_timeout = jiffies + msecs_to_jiffies(50);
 406
 407                         /* FALLTHROUGH */
 408                 default:
 409                         usbip_dbg_vhci_rh(" SetPortFeature: default %d\n",
 410                                           wValue);
 411                         dum->port_status[rhport] |= (1 << wValue);
 412                         break;
 413                 }
 414                 break;
 415
 416         default:
 417                 pr_err("default: no such request\n");
 418
 419                 /* "protocol stall" on error */
 420                 retval = -EPIPE;
 421         }
 422
 423         if (usbip_dbg_flag_vhci_rh) {
 424                 pr_debug("port %d\n", rhport);
 425                 /* Only dump valid port status */
 426                 if (rhport >= 0) {
 427                         dump_port_status_diff(prev_port_status[rhport],
 428                                               dum->port_status[rhport]);
 429                 }
 430         }
 431         usbip_dbg_vhci_rh(" bye\n");
 432
 433         spin_unlock_irqrestore(&dum->lock, flags);
 434
 435         return retval;
 436 }
 437
 438 static struct vhci_device *get_vdev(struct usb_device *udev)
 439 {
 440         struct platform_device *pdev;
 441         struct usb_hcd *hcd;
 442         struct vhci_hcd *vhci;
 443         int pdev_nr, rhport;
 444
 445         if (!udev)
 446                 return NULL;
 447
 448         for (pdev_nr = 0; pdev_nr < vhci_num_controllers; pdev_nr++) {
 449                 pdev = *(vhci_pdevs + pdev_nr);
 450                 if (pdev == NULL)
 451                         continue;
 452                 hcd = platform_get_drvdata(pdev);
 453                 if (hcd == NULL)
 454                         continue;
 455                 vhci = hcd_to_vhci(hcd);
 456                 for (rhport = 0; rhport < VHCI_HC_PORTS; rhport++) {
 457                         if (vhci->vdev[rhport].udev == udev)
 458                                 return &vhci->vdev[rhport];
 459                 }
 460         }
 461
 462         return NULL;
 463 }
 464
 465 static void vhci_tx_urb(struct urb *urb)
 466 {
 467         struct vhci_device *vdev = get_vdev(urb->dev);
 468         struct vhci_priv *priv;
 469         struct vhci_hcd *vhci;
 470         unsigned long flags;
 471
 472         if (!vdev) {
 473                 pr_err("could not get virtual device");
 474                 return;
 475         }
 476         vhci = vdev_to_vhci(vdev);
 477
 478         priv = kzalloc(sizeof(struct vhci_priv), GFP_ATOMIC);
 479         if (!priv) {
 480                 usbip_event_add(&vdev->ud, VDEV_EVENT_ERROR_MALLOC);
 481                 return;
 482         }
 483
 484         spin_lock_irqsave(&vdev->priv_lock, flags);
 485
 486         priv->seqnum = atomic_inc_return(&vhci->seqnum);
 487         if (priv->seqnum == 0xffff)
 488                 dev_info(&urb->dev->dev, "seqnum max\n");
 489
 490         priv->vdev = vdev;
 491         priv->urb = urb;
 492
 493         urb->hcpriv = (void *) priv;
 494
 495         list_add_tail(&priv->list, &vdev->priv_tx);
 496
 497         wake_up(&vdev->waitq_tx);
 498         spin_unlock_irqrestore(&vdev->priv_lock, flags);
 499 }
 500
 501 static int vhci_urb_enqueue(struct usb_hcd *hcd, struct urb *urb,
 502                             gfp_t mem_flags)
 503 {
 504         struct vhci_hcd *vhci = hcd_to_vhci(hcd);
 505         struct device *dev = &urb->dev->dev;
 506         u8 portnum = urb->dev->portnum;
 507         int ret = 0;
 508         struct vhci_device *vdev;
 509         unsigned long flags;
 510
 511         if (portnum > VHCI_HC_PORTS) {
 512                 pr_err("invalid port number %d\n", portnum);
 513                 return -ENODEV;
 514         }
 515         vdev = &vhci->vdev[portnum-1];
 516
 517         if (!urb->transfer_buffer && urb->transfer_buffer_length) {
 518                 dev_dbg(dev, "Null URB transfer buffer\n");
 519                 return -EINVAL;
 520         }
 521
 522         spin_lock_irqsave(&vhci->lock, flags);
 523
 524         if (urb->status != -EINPROGRESS) {
 525                 dev_err(dev, "URB already unlinked!, status %d\n", urb->status);
 526                 spin_unlock_irqrestore(&vhci->lock, flags);
 527                 return urb->status;
 528         }
 529
 530         /* refuse enqueue for dead connection */
 531         spin_lock(&vdev->ud.lock);
 532         if (vdev->ud.status == VDEV_ST_NULL ||
 533             vdev->ud.status == VDEV_ST_ERROR) {
 534                 dev_err(dev, "enqueue for inactive port %d\n", vdev->rhport);
 535                 spin_unlock(&vdev->ud.lock);
 536                 spin_unlock_irqrestore(&vhci->lock, flags);
 537                 return -ENODEV;
 538         }
 539         spin_unlock(&vdev->ud.lock);
 540
 541         ret = usb_hcd_link_urb_to_ep(hcd, urb);
 542         if (ret)
 543                 goto no_need_unlink;
 544
 545         /*
 546          * The enumeration process is as follows;
 547          *
 548          *  1. Get_Descriptor request to DevAddrs(0) EndPoint(0)
 549          *     to get max packet length of default pipe
 550          *
 551          *  2. Set_Address request to DevAddr(0) EndPoint(0)
 552          *
 553          */
 554         if (usb_pipedevice(urb->pipe) == 0) {
 555                 __u8 type = usb_pipetype(urb->pipe);
 556                 struct usb_ctrlrequest *ctrlreq =
 557                         (struct usb_ctrlrequest *) urb->setup_packet;
 558
 559                 if (type != PIPE_CONTROL || !ctrlreq) {
 560                         dev_err(dev, "invalid request to devnum 0\n");
 561                         ret = -EINVAL;
 562                         goto no_need_xmit;
 563                 }
 564
 565                 switch (ctrlreq->bRequest) {
 566                 case USB_REQ_SET_ADDRESS:
 567                         /* set_address may come when a device is reset */
 568                         dev_info(dev, "SetAddress Request (%d) to port %d\n",
 569                                  ctrlreq->wValue, vdev->rhport);
 570
 571                         usb_put_dev(vdev->udev);
 572                         vdev->udev = usb_get_dev(urb->dev);
 573
 574                         spin_lock(&vdev->ud.lock);
 575                         vdev->ud.status = VDEV_ST_USED;
 576                         spin_unlock(&vdev->ud.lock);
 577
 578                         if (urb->status == -EINPROGRESS) {
 579                                 /* This request is successfully completed. */
 580                                 /* If not -EINPROGRESS, possibly unlinked. */
 581                                 urb->status = 0;
 582                         }
 583
 584                         goto no_need_xmit;
 585
 586                 case USB_REQ_GET_DESCRIPTOR:
 587                         if (ctrlreq->wValue == cpu_to_le16(USB_DT_DEVICE << 8))
 588                                 usbip_dbg_vhci_hc(
 589                                         "Not yet?:Get_Descriptor to device 0 (get max pipe size)\n");
 590
 591                         usb_put_dev(vdev->udev);
 592                         vdev->udev = usb_get_dev(urb->dev);
 593                         goto out;
 594
 595                 default:
 596                         /* NOT REACHED */
 597                         dev_err(dev,
 598                                 "invalid request to devnum 0 bRequest %u, wValue %u\n",
 599                                 ctrlreq->bRequest,
 600                                 ctrlreq->wValue);
 601                         ret =  -EINVAL;
 602                         goto no_need_xmit;
 603                 }
 604
 605         }
 606
 607 out:
 608         vhci_tx_urb(urb);
 609         spin_unlock_irqrestore(&vhci->lock, flags);
 610
 611         return 0;
 612
 613 no_need_xmit:
 614         usb_hcd_unlink_urb_from_ep(hcd, urb);
 615 no_need_unlink:
 616         spin_unlock_irqrestore(&vhci->lock, flags);
 617         if (!ret)
 618                 usb_hcd_giveback_urb(hcd, urb, urb->status);
 619         return ret;
 620 }
 621
 622 /*
 623  * vhci_rx gives back the urb after receiving the reply of the urb.  If an
 624  * unlink pdu is sent or not, vhci_rx receives a normal return pdu and gives
 625  * back its urb. For the driver unlinking the urb, the content of the urb is
 626  * not important, but the calling to its completion handler is important; the
 627  * completion of unlinking is notified by the completion handler.
 628  *
 629  *
 630  * CLIENT SIDE
 631  *
 632  * - When vhci_hcd receives RET_SUBMIT,
 633  *
 634  *      - case 1a). the urb of the pdu is not unlinking.
 635  *              - normal case
 636  *              => just give back the urb
 637  *
 638  *      - case 1b). the urb of the pdu is unlinking.
 639  *              - usbip.ko will return a reply of the unlinking request.
 640  *              => give back the urb now and go to case 2b).
 641  *
 642  * - When vhci_hcd receives RET_UNLINK,
 643  *
 644  *      - case 2a). a submit request is still pending in vhci_hcd.
 645  *              - urb was really pending in usbip.ko and urb_unlink_urb() was
 646  *                completed there.
 647  *              => free a pending submit request
 648  *              => notify unlink completeness by giving back the urb
 649  *
 650  *      - case 2b). a submit request is *not* pending in vhci_hcd.
 651  *              - urb was already given back to the core driver.
 652  *              => do not give back the urb
 653  *
 654  *
 655  * SERVER SIDE
 656  *
 657  * - When usbip receives CMD_UNLINK,
 658  *
 659  *      - case 3a). the urb of the unlink request is now in submission.
 660  *              => do usb_unlink_urb().
 661  *              => after the unlink is completed, send RET_UNLINK.
 662  *
 663  *      - case 3b). the urb of the unlink request is not in submission.
 664  *              - may be already completed or never be received
 665  *              => send RET_UNLINK
 666  *
 667  */
 668 static int vhci_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
 669 {
 670         struct vhci_hcd *vhci = hcd_to_vhci(hcd);
 671         struct vhci_priv *priv;
 672         struct vhci_device *vdev;
 673         unsigned long flags;
 674
 675         spin_lock_irqsave(&vhci->lock, flags);
 676
 677         priv = urb->hcpriv;
 678         if (!priv) {
 679                 /* URB was never linked! or will be soon given back by
 680                  * vhci_rx. */
 681                 spin_unlock_irqrestore(&vhci->lock, flags);
 682                 return -EIDRM;
 683         }
 684
 685         {
 686                 int ret = 0;
 687
 688                 ret = usb_hcd_check_unlink_urb(hcd, urb, status);
 689                 if (ret) {
 690                         spin_unlock_irqrestore(&vhci->lock, flags);
 691                         return ret;
 692                 }
 693         }
 694
 695          /* send unlink request here? */
 696         vdev = priv->vdev;
 697
 698         if (!vdev->ud.tcp_socket) {
 699                 /* tcp connection is closed */
 700                 spin_lock(&vdev->priv_lock);
 701
 702                 list_del(&priv->list);
 703                 kfree(priv);
 704                 urb->hcpriv = NULL;
 705
 706                 spin_unlock(&vdev->priv_lock);
 707
 708                 /*
 709                  * If tcp connection is alive, we have sent CMD_UNLINK.
 710                  * vhci_rx will receive RET_UNLINK and give back the URB.
 711                  * Otherwise, we give back it here.
 712                  */
 713                 usb_hcd_unlink_urb_from_ep(hcd, urb);
 714
 715                 spin_unlock_irqrestore(&vhci->lock, flags);
 716                 usb_hcd_giveback_urb(vhci_to_hcd(vhci), urb, urb->status);
 717                 spin_lock_irqsave(&vhci->lock, flags);
 718
 719         } else {
 720                 /* tcp connection is alive */
 721                 struct vhci_unlink *unlink;
 722
 723                 spin_lock(&vdev->priv_lock);
 724
 725                 /* setup CMD_UNLINK pdu */
 726                 unlink = kzalloc(sizeof(struct vhci_unlink), GFP_ATOMIC);
 727                 if (!unlink) {
 728                         spin_unlock(&vdev->priv_lock);
 729                         spin_unlock_irqrestore(&vhci->lock, flags);
 730                         usbip_event_add(&vdev->ud, VDEV_EVENT_ERROR_MALLOC);
 731                         return -ENOMEM;
 732                 }
 733
 734                 unlink->seqnum = atomic_inc_return(&vhci->seqnum);
 735                 if (unlink->seqnum == 0xffff)
 736                         pr_info("seqnum max\n");
 737
 738                 unlink->unlink_seqnum = priv->seqnum;
 739
 740                 /* send cmd_unlink and try to cancel the pending URB in the
 741                  * peer */
 742                 list_add_tail(&unlink->list, &vdev->unlink_tx);
 743                 wake_up(&vdev->waitq_tx);
 744
 745                 spin_unlock(&vdev->priv_lock);
 746         }
 747
 748         spin_unlock_irqrestore(&vhci->lock, flags);
 749
 750         usbip_dbg_vhci_hc("leave\n");
 751         return 0;
 752 }
 753
 754 static void vhci_device_unlink_cleanup(struct vhci_device *vdev)
 755 {
 756         struct vhci_hcd *vhci = vdev_to_vhci(vdev);
 757         struct usb_hcd *hcd = vhci_to_hcd(vhci);
 758         struct vhci_unlink *unlink, *tmp;
 759         unsigned long flags;
 760
 761         spin_lock_irqsave(&vhci->lock, flags);
 762         spin_lock(&vdev->priv_lock);
 763
 764         list_for_each_entry_safe(unlink, tmp, &vdev->unlink_tx, list) {
 765                 struct urb *urb;
 766
 767                 /* give back urb of unsent unlink request */
 768                 pr_info("unlink cleanup tx %lu\n", unlink->unlink_seqnum);
 769
 770                 urb = pickup_urb_and_free_priv(vdev, unlink->unlink_seqnum);
 771                 if (!urb) {
 772                         list_del(&unlink->list);
 773                         kfree(unlink);
 774                         continue;
 775                 }
 776
 777                 urb->status = -ENODEV;
 778
 779                 usb_hcd_unlink_urb_from_ep(hcd, urb);
 780
 781                 list_del(&unlink->list);
 782
 783                 spin_unlock(&vdev->priv_lock);
 784                 spin_unlock_irqrestore(&vhci->lock, flags);
 785
 786                 usb_hcd_giveback_urb(hcd, urb, urb->status);
 787
 788                 spin_lock_irqsave(&vhci->lock, flags);
 789                 spin_lock(&vdev->priv_lock);
 790
 791                 kfree(unlink);
 792         }
 793
 794         while (!list_empty(&vdev->unlink_rx)) {
 795                 struct urb *urb;
 796
 797                 unlink = list_first_entry(&vdev->unlink_rx, struct vhci_unlink,
 798                         list);
 799
 800                 /* give back URB of unanswered unlink request */
 801                 pr_info("unlink cleanup rx %lu\n", unlink->unlink_seqnum);
 802
 803                 urb = pickup_urb_and_free_priv(vdev, unlink->unlink_seqnum);
 804                 if (!urb) {
 805                         pr_info("the urb (seqnum %lu) was already given back\n",
 806                                 unlink->unlink_seqnum);
 807                         list_del(&unlink->list);
 808                         kfree(unlink);
 809                         continue;
 810                 }
 811
 812                 urb->status = -ENODEV;
 813
 814                 usb_hcd_unlink_urb_from_ep(hcd, urb);
 815
 816                 list_del(&unlink->list);
 817
 818                 spin_unlock(&vdev->priv_lock);
 819                 spin_unlock_irqrestore(&vhci->lock, flags);
 820
 821                 usb_hcd_giveback_urb(hcd, urb, urb->status);
 822
 823                 spin_lock_irqsave(&vhci->lock, flags);
 824                 spin_lock(&vdev->priv_lock);
 825
 826                 kfree(unlink);
 827         }
 828
 829         spin_unlock(&vdev->priv_lock);
 830         spin_unlock_irqrestore(&vhci->lock, flags);
 831 }
 832
 833 /*
 834  * The important thing is that only one context begins cleanup.
 835  * This is why error handling and cleanup become simple.
 836  * We do not want to consider race condition as possible.
 837  */
 838 static void vhci_shutdown_connection(struct usbip_device *ud)
 839 {
 840         struct vhci_device *vdev = container_of(ud, struct vhci_device, ud);
 841
 842         /* need this? see stub_dev.c */
 843         if (ud->tcp_socket) {
 844                 pr_debug("shutdown tcp_socket\n");
 845                 kernel_sock_shutdown(ud->tcp_socket, SHUT_RDWR);
 846         }
 847
 848         /* kill threads related to this sdev */
 849         if (vdev->ud.tcp_rx) {
 850                 kthread_stop_put(vdev->ud.tcp_rx);
 851                 vdev->ud.tcp_rx = NULL;
 852         }
 853         if (vdev->ud.tcp_tx) {
 854                 kthread_stop_put(vdev->ud.tcp_tx);
 855                 vdev->ud.tcp_tx = NULL;
 856         }
 857         pr_info("stop threads\n");
 858
 859         /* active connection is closed */
 860         if (vdev->ud.tcp_socket) {
 861                 sockfd_put(vdev->ud.tcp_socket);
 862                 vdev->ud.tcp_socket = NULL;
 863                 vdev->ud.sockfd = -1;
 864         }
 865         pr_info("release socket\n");
 866
 867         vhci_device_unlink_cleanup(vdev);
 868
 869         /*
 870          * rh_port_disconnect() is a trigger of ...
 871          *   usb_disable_device():
 872          *      disable all the endpoints for a USB device.
 873          *   usb_disable_endpoint():
 874          *      disable endpoints. pending urbs are unlinked(dequeued).
 875          *
 876          * NOTE: After calling rh_port_disconnect(), the USB device drivers of a
 877          * detached device should release used urbs in a cleanup function (i.e.
 878          * xxx_disconnect()). Therefore, vhci_hcd does not need to release
 879          * pushed urbs and their private data in this function.
 880          *
 881          * NOTE: vhci_dequeue() must be considered carefully. When shutting down
 882          * a connection, vhci_shutdown_connection() expects vhci_dequeue()
 883          * gives back pushed urbs and frees their private data by request of
 884          * the cleanup function of a USB driver. When unlinking a urb with an
 885          * active connection, vhci_dequeue() does not give back the urb which
 886          * is actually given back by vhci_rx after receiving its return pdu.
 887          *
 888          */
 889         rh_port_disconnect(vdev);
 890
 891         pr_info("disconnect device\n");
 892 }
 893
 894
 895 static void vhci_device_reset(struct usbip_device *ud)
 896 {
 897         struct vhci_device *vdev = container_of(ud, struct vhci_device, ud);
 898         unsigned long flags;
 899
 900         spin_lock_irqsave(&ud->lock, flags);
 901
 902         vdev->speed  = 0;
 903         vdev->devid  = 0;
 904
 905         usb_put_dev(vdev->udev);
 906         vdev->udev = NULL;
 907
 908         if (ud->tcp_socket) {
 909                 sockfd_put(ud->tcp_socket);
 910                 ud->tcp_socket = NULL;
 911                 ud->sockfd = -1;
 912         }
 913         ud->status = VDEV_ST_NULL;
 914
 915         spin_unlock_irqrestore(&ud->lock, flags);
 916 }
 917
 918 static void vhci_device_unusable(struct usbip_device *ud)
 919 {
 920         unsigned long flags;
 921
 922         spin_lock_irqsave(&ud->lock, flags);
 923         ud->status = VDEV_ST_ERROR;
 924         spin_unlock_irqrestore(&ud->lock, flags);
 925 }
 926
 927 static void vhci_device_init(struct vhci_device *vdev)
 928 {
 929         memset(vdev, 0, sizeof(struct vhci_device));
 930
 931         vdev->ud.side   = USBIP_VHCI;
 932         vdev->ud.status = VDEV_ST_NULL;
 933         spin_lock_init(&vdev->ud.lock);
 934         mutex_init(&vdev->ud.sysfs_lock);
 935
 936         INIT_LIST_HEAD(&vdev->priv_rx);
 937         INIT_LIST_HEAD(&vdev->priv_tx);
 938         INIT_LIST_HEAD(&vdev->unlink_tx);
 939         INIT_LIST_HEAD(&vdev->unlink_rx);
 940         spin_lock_init(&vdev->priv_lock);
 941
 942         init_waitqueue_head(&vdev->waitq_tx);
 943
 944         vdev->ud.eh_ops.shutdown = vhci_shutdown_connection;
 945         vdev->ud.eh_ops.reset = vhci_device_reset;
 946         vdev->ud.eh_ops.unusable = vhci_device_unusable;
 947
 948         usbip_start_eh(&vdev->ud);
 949 }
 950
 951 static int hcd_name_to_id(const char *name)
 952 {
 953         char *c;
 954         long val;
 955         int ret;
 956
 957         c = strchr(name, '.');
 958         if (c == NULL)
 959                 return 0;
 960
 961         ret = kstrtol(c+1, 10, &val);
 962         if (ret < 0)
 963                 return ret;
 964
 965         return val;
 966 }
 967
 968 static int vhci_start(struct usb_hcd *hcd)
 969 {
 970         struct vhci_hcd *vhci = hcd_to_vhci(hcd);
 971         int id, rhport;
 972         int err = 0;
 973
 974         usbip_dbg_vhci_hc("enter vhci_start\n");
 975
 976         /* initialize private data of usb_hcd */
 977
 978         for (rhport = 0; rhport < VHCI_HC_PORTS; rhport++) {
 979                 struct vhci_device *vdev = &vhci->vdev[rhport];
 980
 981                 vhci_device_init(vdev);
 982                 vdev->rhport = rhport;
 983         }
 984
 985         atomic_set(&vhci->seqnum, 0);
 986         spin_lock_init(&vhci->lock);
 987
 988         hcd->power_budget = 0; /* no limit */
 989         hcd->uses_new_polling = 1;
 990
 991         id = hcd_name_to_id(hcd_name(hcd));
 992         if (id < 0) {
 993                 pr_err("invalid vhci name %s\n", hcd_name(hcd));
 994                 return -EINVAL;
 995         }
 996
 997         /* vhci_hcd is now ready to be controlled through sysfs */
 998         if (id == 0) {
 999                 err = vhci_init_attr_group();
1000                 if (err) {
1001                         pr_err("init attr group\n");
1002                         return err;
1003                 }
1004                 err = sysfs_create_group(&hcd_dev(hcd)->kobj, &vhci_attr_group);
1005                 if (err) {
1006                         pr_err("create sysfs files\n");
1007                         vhci_finish_attr_group();
1008                         return err;
1009                 }
1010                 pr_info("created sysfs %s\n", hcd_name(hcd));
1011         }
1012
1013         return 0;
1014 }
1015
1016 static void vhci_stop(struct usb_hcd *hcd)
1017 {
1018         struct vhci_hcd *vhci = hcd_to_vhci(hcd);
1019         int id, rhport;
1020
1021         usbip_dbg_vhci_hc("stop VHCI controller\n");
1022
1023         /* 1. remove the userland interface of vhci_hcd */
1024         id = hcd_name_to_id(hcd_name(hcd));
1025         if (id == 0) {
1026                 sysfs_remove_group(&hcd_dev(hcd)->kobj, &vhci_attr_group);
1027                 vhci_finish_attr_group();
1028         }
1029
1030         /* 2. shutdown all the ports of vhci_hcd */
1031         for (rhport = 0; rhport < VHCI_HC_PORTS; rhport++) {
1032                 struct vhci_device *vdev = &vhci->vdev[rhport];
1033
1034                 usbip_event_add(&vdev->ud, VDEV_EVENT_REMOVED);
1035                 usbip_stop_eh(&vdev->ud);
1036         }
1037 }
1038
1039 static int vhci_get_frame_number(struct usb_hcd *hcd)
1040 {
1041         dev_err_ratelimited(&hcd->self.root_hub->dev, "Not yet implemented\n");
1042         return 0;
1043 }
1044
1045 #ifdef CONFIG_PM
1046
1047 /* FIXME: suspend/resume */
1048 static int vhci_bus_suspend(struct usb_hcd *hcd)
1049 {
1050         struct vhci_hcd *vhci = hcd_to_vhci(hcd);
1051         unsigned long flags;
1052
1053         dev_dbg(&hcd->self.root_hub->dev, "%s\n", __func__);
1054
1055         spin_lock_irqsave(&vhci->lock, flags);
1056         hcd->state = HC_STATE_SUSPENDED;
1057         spin_unlock_irqrestore(&vhci->lock, flags);
1058
1059         return 0;
1060 }
1061
1062 static int vhci_bus_resume(struct usb_hcd *hcd)
1063 {
1064         struct vhci_hcd *vhci = hcd_to_vhci(hcd);
1065         int rc = 0;
1066         unsigned long flags;
1067
1068         dev_dbg(&hcd->self.root_hub->dev, "%s\n", __func__);
1069
1070         spin_lock_irqsave(&vhci->lock, flags);
1071         if (!HCD_HW_ACCESSIBLE(hcd))
1072                 rc = -ESHUTDOWN;
1073         else
1074                 hcd->state = HC_STATE_RUNNING;
1075         spin_unlock_irqrestore(&vhci->lock, flags);
1076
1077         return rc;
1078 }
1079
1080 #else
1081
1082 #define vhci_bus_suspend      NULL
1083 #define vhci_bus_resume       NULL
1084 #endif
1085
1086 static struct hc_driver vhci_hc_driver = {
1087         .description    = driver_name,
1088         .product_desc   = driver_desc,
1089         .hcd_priv_size  = sizeof(struct vhci_hcd),
1090
1091         .flags          = HCD_USB2,
1092
1093         .start          = vhci_start,
1094         .stop           = vhci_stop,
1095
1096         .urb_enqueue    = vhci_urb_enqueue,
1097         .urb_dequeue    = vhci_urb_dequeue,
1098
1099         .get_frame_number = vhci_get_frame_number,
1100
1101         .hub_status_data = vhci_hub_status,
1102         .hub_control    = vhci_hub_control,
1103         .bus_suspend    = vhci_bus_suspend,
1104         .bus_resume     = vhci_bus_resume,
1105 };
1106
1107 static int vhci_hcd_probe(struct platform_device *pdev)
1108 {
1109         struct usb_hcd          *hcd;
1110         int                     ret;
1111
1112         usbip_dbg_vhci_hc("name %s id %d\n", pdev->name, pdev->id);
1113
1114         /*
1115          * Allocate and initialize hcd.
1116          * Our private data is also allocated automatically.
1117          */
1118         hcd = usb_create_hcd(&vhci_hc_driver, &pdev->dev, dev_name(&pdev->dev));
1119         if (!hcd) {
1120                 pr_err("create hcd failed\n");
1121                 return -ENOMEM;
1122         }
1123         hcd->has_tt = 1;
1124
1125         /*
1126          * Finish generic HCD structure initialization and register.
1127          * Call the driver's reset() and start() routines.
1128          */
1129         ret = usb_add_hcd(hcd, 0, 0);
1130         if (ret != 0) {
1131                 pr_err("usb_add_hcd failed %d\n", ret);
1132                 usb_put_hcd(hcd);
1133                 return ret;
1134         }
1135
1136         usbip_dbg_vhci_hc("bye\n");
1137         return 0;
1138 }
1139
1140 static int vhci_hcd_remove(struct platform_device *pdev)
1141 {
1142         struct usb_hcd  *hcd;
1143
1144         hcd = platform_get_drvdata(pdev);
1145         if (!hcd)
1146                 return 0;
1147
1148         /*
1149          * Disconnects the root hub,
1150          * then reverses the effects of usb_add_hcd(),
1151          * invoking the HCD's stop() methods.
1152          */
1153         usb_remove_hcd(hcd);
1154         usb_put_hcd(hcd);
1155
1156         return 0;
1157 }
1158
1159 #ifdef CONFIG_PM
1160
1161 /* what should happen for USB/IP under suspend/resume? */
1162 static int vhci_hcd_suspend(struct platform_device *pdev, pm_message_t state)
1163 {
1164         struct usb_hcd *hcd;
1165         struct vhci_hcd *vhci;
1166         int rhport;
1167         int connected = 0;
1168         int ret = 0;
1169         unsigned long flags;
1170
1171         hcd = platform_get_drvdata(pdev);
1172         if (!hcd)
1173                 return 0;
1174         vhci = hcd_to_vhci(hcd);
1175
1176         spin_lock_irqsave(&vhci->lock, flags);
1177
1178         for (rhport = 0; rhport < VHCI_HC_PORTS; rhport++)
1179                 if (vhci->port_status[rhport] & USB_PORT_STAT_CONNECTION)
1180                         connected += 1;
1181
1182         spin_unlock_irqrestore(&vhci->lock, flags);
1183
1184         if (connected > 0) {
1185                 dev_info(&pdev->dev,
1186                          "We have %d active connection%s. Do not suspend.\n",
1187                          connected, (connected == 1 ? "" : "s"));
1188                 ret =  -EBUSY;
1189         } else {
1190                 dev_info(&pdev->dev, "suspend vhci_hcd");
1191                 clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
1192         }
1193
1194         return ret;
1195 }
1196
1197 static int vhci_hcd_resume(struct platform_device *pdev)
1198 {
1199         struct usb_hcd *hcd;
1200
1201         dev_dbg(&pdev->dev, "%s\n", __func__);
1202
1203         hcd = platform_get_drvdata(pdev);
1204         if (!hcd)
1205                 return 0;
1206         set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
1207         usb_hcd_poll_rh_status(hcd);
1208
1209         return 0;
1210 }
1211
1212 #else
1213
1214 #define vhci_hcd_suspend        NULL
1215 #define vhci_hcd_resume         NULL
1216
1217 #endif
1218
1219 static struct platform_driver vhci_driver = {
1220         .probe  = vhci_hcd_probe,
1221         .remove = vhci_hcd_remove,
1222         .suspend = vhci_hcd_suspend,
1223         .resume = vhci_hcd_resume,
1224         .driver = {
1225                 .name = driver_name,
1226         },
1227 };
1228
1229 static int add_platform_device(int id)
1230 {
1231         struct platform_device *pdev;
1232         int dev_nr;
1233
1234         if (id == 0)
1235                 dev_nr = -1;
1236         else
1237                 dev_nr = id;
1238
1239         pdev = platform_device_register_simple(driver_name, dev_nr, NULL, 0);
1240         if (IS_ERR(pdev))
1241                 return PTR_ERR(pdev);
1242
1243         *(vhci_pdevs + id) = pdev;
1244         return 0;
1245 }
1246
1247 static void del_platform_devices(void)
1248 {
1249         struct platform_device *pdev;
1250         int i;
1251
1252         for (i = 0; i < vhci_num_controllers; i++) {
1253                 pdev = *(vhci_pdevs + i);
1254                 if (pdev != NULL)
1255                         platform_device_unregister(pdev);
1256                 *(vhci_pdevs + i) = NULL;
1257         }
1258         sysfs_remove_link(&platform_bus.kobj, driver_name);
1259 }
1260
1261 static int __init vhci_hcd_init(void)
1262 {
1263         int i, ret;
1264
1265         if (usb_disabled())
1266                 return -ENODEV;
1267
1268         if (vhci_num_controllers < 1)
1269                 vhci_num_controllers = 1;
1270
1271         vhci_pdevs = kcalloc(vhci_num_controllers, sizeof(void *), GFP_KERNEL);
1272         if (vhci_pdevs == NULL)
1273                 return -ENOMEM;
1274
1275         ret = platform_driver_register(&vhci_driver);
1276         if (ret)
1277                 goto err_driver_register;
1278
1279         for (i = 0; i < vhci_num_controllers; i++) {
1280                 ret = add_platform_device(i);
1281                 if (ret)
1282                         goto err_platform_device_register;
1283         }
1284
1285         pr_info(DRIVER_DESC " v" USBIP_VERSION "\n");
1286         return ret;
1287
1288 err_platform_device_register:
1289         del_platform_devices();
1290         platform_driver_unregister(&vhci_driver);
1291 err_driver_register:
1292         kfree(vhci_pdevs);
1293         return ret;
1294 }
1295
1296 static void __exit vhci_hcd_exit(void)
1297 {
1298         del_platform_devices();
1299         platform_driver_unregister(&vhci_driver);
1300         kfree(vhci_pdevs);
1301 }
1302
1303 module_init(vhci_hcd_init);
1304 module_exit(vhci_hcd_exit);
1305
1306 MODULE_AUTHOR(DRIVER_AUTHOR);
1307 MODULE_DESCRIPTION(DRIVER_DESC);
1308 MODULE_LICENSE("GPL");
1309 MODULE_VERSION(USBIP_VERSION);