drivers/staging/usbip/vhci_hcd.c

   1 /*
   2  * Copyright (C) 2003-2008 Takahiro Hirofuchi
   3  *
   4  * This is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
  17  * USA.
  18  */
  19
  20 #include <linux/slab.h>
  21
  22 #include "usbip_common.h"
  23 #include "vhci.h"
  24
  25 #define DRIVER_VERSION "1.0"
  26 #define DRIVER_AUTHOR "Takahiro Hirofuchi"
  27 #define DRIVER_DESC "Virtual Host Controller Interface Driver for USB/IP"
  28 #define DRIVER_LICENCE "GPL"
  29 MODULE_AUTHOR(DRIVER_AUTHOR);
  30 MODULE_DESCRIPTION(DRIVER_DESC);
  31 MODULE_LICENSE(DRIVER_LICENCE);
  32
  33
  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
  46 /* See usb gadget dummy hcd */
  47
  48
  49 static int vhci_hub_status(struct usb_hcd *hcd, char *buff);
  50 static int vhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
  51                 u16 wIndex, char *buff, u16 wLength);
  52 static int vhci_urb_enqueue(struct usb_hcd *hcd, struct urb *urb,
  53                                                         gfp_t mem_flags);
  54 static int vhci_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status);
  55 static int vhci_start(struct usb_hcd *vhci_hcd);
  56 static void vhci_stop(struct usb_hcd *hcd);
  57 static int vhci_get_frame_number(struct usb_hcd *hcd);
  58
  59 static const char driver_name[] = "vhci_hcd";
  60 static const char driver_desc[] = "USB/IP Virtual Host Controller";
  61
  62 struct vhci_hcd *the_controller;
  63
  64 static const char *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
 100 static void dump_port_status(u32 status)
 101 {
 102         int i = 0;
 103
 104         printk(KERN_DEBUG "status %08x:", status);
 105         for (i = 0; i < 32; i++) {
 106                 if (status & (1 << i))
 107                         printk(" %s", bit_desc[i]);
 108         }
 109
 110         printk("\n");
 111 }
 112
 113
 114
 115 void rh_port_connect(int rhport, enum usb_device_speed speed)
 116 {
 117         unsigned long   flags;
 118
 119         usbip_dbg_vhci_rh("rh_port_connect %d\n", rhport);
 120
 121         spin_lock_irqsave(&the_controller->lock, flags);
 122
 123         the_controller->port_status[rhport] |= USB_PORT_STAT_CONNECTION
 124                 | (1 << USB_PORT_FEAT_C_CONNECTION);
 125
 126         switch (speed) {
 127         case USB_SPEED_HIGH:
 128                 the_controller->port_status[rhport] |= USB_PORT_STAT_HIGH_SPEED;
 129                 break;
 130         case USB_SPEED_LOW:
 131                 the_controller->port_status[rhport] |= USB_PORT_STAT_LOW_SPEED;
 132                 break;
 133         default:
 134                 break;
 135         }
 136
 137         /* spin_lock(&the_controller->vdev[rhport].ud.lock);
 138          * the_controller->vdev[rhport].ud.status = VDEV_CONNECT;
 139          * spin_unlock(&the_controller->vdev[rhport].ud.lock); */
 140
 141         spin_unlock_irqrestore(&the_controller->lock, flags);
 142
 143         usb_hcd_poll_rh_status(vhci_to_hcd(the_controller));
 144 }
 145
 146 void rh_port_disconnect(int rhport)
 147 {
 148         unsigned long flags;
 149
 150         usbip_dbg_vhci_rh("rh_port_disconnect %d\n", rhport);
 151
 152         spin_lock_irqsave(&the_controller->lock, flags);
 153         /* stop_activity(dum, driver); */
 154         the_controller->port_status[rhport] &= ~USB_PORT_STAT_CONNECTION;
 155         the_controller->port_status[rhport] |=
 156                                         (1 << USB_PORT_FEAT_C_CONNECTION);
 157
 158
 159         /* not yet complete the disconnection
 160          * spin_lock(&vdev->ud.lock);
 161          * vdev->ud.status = VHC_ST_DISCONNECT;
 162          * spin_unlock(&vdev->ud.lock); */
 163
 164         spin_unlock_irqrestore(&the_controller->lock, flags);
 165
 166         usb_hcd_poll_rh_status(vhci_to_hcd(the_controller));
 167 }
 168
 169
 170
 171 /*----------------------------------------------------------------------*/
 172
 173 #define PORT_C_MASK \
 174         ((USB_PORT_STAT_C_CONNECTION \
 175           | USB_PORT_STAT_C_ENABLE \
 176           | USB_PORT_STAT_C_SUSPEND \
 177           | USB_PORT_STAT_C_OVERCURRENT \
 178           | USB_PORT_STAT_C_RESET) << 16)
 179
 180 /*
 181  * This function is almostly the same as dummy_hcd.c:dummy_hub_status() without
 182  * suspend/resume support. But, it is modified to provide multiple ports.
 183  *
 184  * @buf: a bitmap to show which port status has been changed.
 185  *  bit  0: reserved or used for another purpose?
 186  *  bit  1: the status of port 0 has been changed.
 187  *  bit  2: the status of port 1 has been changed.
 188  *  ...
 189  *  bit  7: the status of port 6 has been changed.
 190  *  bit  8: the status of port 7 has been changed.
 191  *  ...
 192  *  bit 15: the status of port 14 has been changed.
 193  *
 194  * So, the maximum number of ports is 31 ( port 0 to port 30) ?
 195  *
 196  * The return value is the actual transfered length in byte. If nothing has
 197  * been changed, return 0. In the case that the number of ports is less than or
 198  * equal to 6 (VHCI_NPORTS==7), return 1.
 199  *
 200  */
 201 static int vhci_hub_status(struct usb_hcd *hcd, char *buf)
 202 {
 203         struct vhci_hcd *vhci;
 204         unsigned long   flags;
 205         int             retval = 0;
 206
 207         /* the enough buffer is allocated according to USB_MAXCHILDREN */
 208         unsigned long   *event_bits = (unsigned long *) buf;
 209         int             rhport;
 210         int             changed = 0;
 211
 212
 213         *event_bits = 0;
 214
 215         vhci = hcd_to_vhci(hcd);
 216
 217         spin_lock_irqsave(&vhci->lock, flags);
 218         if (!HCD_HW_ACCESSIBLE(hcd)) {
 219                 usbip_dbg_vhci_rh("hw accessible flag in on?\n");
 220                 goto done;
 221         }
 222
 223         /* check pseudo status register for each port */
 224         for (rhport = 0; rhport < VHCI_NPORTS; rhport++) {
 225                 if ((vhci->port_status[rhport] & PORT_C_MASK)) {
 226                         /* The status of a port has been changed, */
 227                         usbip_dbg_vhci_rh("port %d is changed\n", rhport);
 228
 229                         *event_bits |= 1 << (rhport + 1);
 230                         changed = 1;
 231                 }
 232         }
 233
 234         usbip_uinfo("changed %d\n", changed);
 235
 236         if (hcd->state == HC_STATE_SUSPENDED)
 237                 usb_hcd_resume_root_hub(hcd);
 238
 239         if (changed)
 240                 retval = 1 + (VHCI_NPORTS / 8);
 241         else
 242                 retval = 0;
 243
 244 done:
 245         spin_unlock_irqrestore(&vhci->lock, flags);
 246         return retval;
 247 }
 248
 249 /* See hub_configure in hub.c */
 250 static inline void hub_descriptor(struct usb_hub_descriptor *desc)
 251 {
 252         memset(desc, 0, sizeof(*desc));
 253         desc->bDescriptorType = 0x29;
 254         desc->bDescLength = 9;
 255         desc->wHubCharacteristics = (__force __u16)
 256                 (__constant_cpu_to_le16(0x0001));
 257         desc->bNbrPorts = VHCI_NPORTS;
 258         desc->bitmap[0] = 0xff;
 259         desc->bitmap[1] = 0xff;
 260 }
 261
 262 static int vhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
 263                             u16 wIndex, char *buf, u16 wLength)
 264 {
 265         struct vhci_hcd *dum;
 266         int             retval = 0;
 267         unsigned long   flags;
 268         int             rhport;
 269
 270         u32 prev_port_status[VHCI_NPORTS];
 271
 272         if (!HCD_HW_ACCESSIBLE(hcd))
 273                 return -ETIMEDOUT;
 274
 275         /*
 276          * NOTE:
 277          * wIndex shows the port number and begins from 1.
 278          */
 279         usbip_dbg_vhci_rh("typeReq %x wValue %x wIndex %x\n", typeReq, wValue,
 280                                                                 wIndex);
 281         if (wIndex > VHCI_NPORTS)
 282                 printk(KERN_ERR "%s: invalid port number %d\n", __func__,
 283                                                                 wIndex);
 284         rhport = ((__u8)(wIndex & 0x00ff)) - 1;
 285
 286         dum = hcd_to_vhci(hcd);
 287
 288         spin_lock_irqsave(&dum->lock, flags);
 289
 290         /* store old status and compare now and old later */
 291         if (usbip_dbg_flag_vhci_rh) {
 292                 int i = 0;
 293                 for (i = 0; i < VHCI_NPORTS; i++)
 294                         prev_port_status[i] = dum->port_status[i];
 295         }
 296
 297         switch (typeReq) {
 298         case ClearHubFeature:
 299                 usbip_dbg_vhci_rh(" ClearHubFeature\n");
 300                 break;
 301         case ClearPortFeature:
 302                 switch (wValue) {
 303                 case USB_PORT_FEAT_SUSPEND:
 304                         if (dum->port_status[rhport] & USB_PORT_STAT_SUSPEND) {
 305                                 /* 20msec signaling */
 306                                 dum->resuming = 1;
 307                                 dum->re_timeout =
 308                                         jiffies + msecs_to_jiffies(20);
 309                         }
 310                         break;
 311                 case USB_PORT_FEAT_POWER:
 312                         usbip_dbg_vhci_rh(" ClearPortFeature: "
 313                                                 "USB_PORT_FEAT_POWER\n");
 314                         dum->port_status[rhport] = 0;
 315                         /* dum->address = 0; */
 316                         /* dum->hdev = 0; */
 317                         dum->resuming = 0;
 318                         break;
 319                 case USB_PORT_FEAT_C_RESET:
 320                         usbip_dbg_vhci_rh(" ClearPortFeature: "
 321                                                 "USB_PORT_FEAT_C_RESET\n");
 322                         switch (dum->vdev[rhport].speed) {
 323                         case USB_SPEED_HIGH:
 324                                 dum->port_status[rhport] |=
 325                                                 USB_PORT_STAT_HIGH_SPEED;
 326                                 break;
 327                         case USB_SPEED_LOW:
 328                                 dum->port_status[rhport] |=
 329                                                 USB_PORT_STAT_LOW_SPEED;
 330                                 break;
 331                         default:
 332                                 break;
 333                         }
 334                 default:
 335                         usbip_dbg_vhci_rh(" ClearPortFeature: default %x\n",
 336                                                                 wValue);
 337                         dum->port_status[rhport] &= ~(1 << wValue);
 338                 }
 339                 break;
 340         case GetHubDescriptor:
 341                 usbip_dbg_vhci_rh(" GetHubDescriptor\n");
 342                 hub_descriptor((struct usb_hub_descriptor *) buf);
 343                 break;
 344         case GetHubStatus:
 345                 usbip_dbg_vhci_rh(" GetHubStatus\n");
 346                 *(__le32 *) buf = __constant_cpu_to_le32(0);
 347                 break;
 348         case GetPortStatus:
 349                 usbip_dbg_vhci_rh(" GetPortStatus port %x\n", wIndex);
 350                 if (wIndex > VHCI_NPORTS || wIndex < 1) {
 351                         printk(KERN_ERR "%s: invalid port number %d\n",
 352                                __func__, wIndex);
 353                         retval = -EPIPE;
 354                 }
 355
 356                 /* we do no care of resume. */
 357
 358                 /* whoever resets or resumes must GetPortStatus to
 359                  * complete it!!
 360                  *                                   */
 361                 if (dum->resuming && time_after(jiffies, dum->re_timeout)) {
 362                         printk(KERN_ERR "%s: not yet\n", __func__);
 363                         dum->port_status[rhport] |=
 364                                         (1 << USB_PORT_FEAT_C_SUSPEND);
 365                         dum->port_status[rhport] &=
 366                                         ~(1 << USB_PORT_FEAT_SUSPEND);
 367                         dum->resuming = 0;
 368                         dum->re_timeout = 0;
 369                         /* if (dum->driver && dum->driver->resume) {
 370                          *      spin_unlock (&dum->lock);
 371                          *      dum->driver->resume (&dum->gadget);
 372                          *      spin_lock (&dum->lock);
 373                          * } */
 374                 }
 375
 376                 if ((dum->port_status[rhport] & (1 << USB_PORT_FEAT_RESET)) !=
 377                                 0 && time_after(jiffies, dum->re_timeout)) {
 378                         dum->port_status[rhport] |=
 379                                                 (1 << USB_PORT_FEAT_C_RESET);
 380                         dum->port_status[rhport] &=
 381                                                 ~(1 << USB_PORT_FEAT_RESET);
 382                         dum->re_timeout = 0;
 383
 384                         if (dum->vdev[rhport].ud.status ==
 385                                                         VDEV_ST_NOTASSIGNED) {
 386                                 usbip_dbg_vhci_rh(" enable rhport %d "
 387                                                 "(status %u)\n",
 388                                                 rhport,
 389                                                 dum->vdev[rhport].ud.status);
 390                                 dum->port_status[rhport] |=
 391                                                         USB_PORT_STAT_ENABLE;
 392                         }
 393 #if 0
 394                         if (dum->driver) {
 395
 396                                 dum->port_status[rhport] |=
 397                                                         USB_PORT_STAT_ENABLE;
 398                                 /* give it the best speed we agree on */
 399                                 dum->gadget.speed = dum->driver->speed;
 400                                 dum->gadget.ep0->maxpacket = 64;
 401                                 switch (dum->gadget.speed) {
 402                                 case USB_SPEED_HIGH:
 403                                         dum->port_status[rhport] |=
 404                                         USB_PORT_STAT_HIGH_SPEED;
 405                                         break;
 406                                 case USB_SPEED_LOW:
 407                                         dum->gadget.ep0->maxpacket = 8;
 408                                         dum->port_status[rhport] |=
 409                                         USB_PORT_STAT_LOW_SPEED;
 410                                         break;
 411                                 default:
 412                                         dum->gadget.speed = USB_SPEED_FULL;
 413                                         break;
 414                                 }
 415                         }
 416 #endif
 417
 418                 }
 419                 ((u16 *) buf)[0] = cpu_to_le16(dum->port_status[rhport]);
 420                 ((u16 *) buf)[1] =
 421                                 cpu_to_le16(dum->port_status[rhport] >> 16);
 422
 423                 usbip_dbg_vhci_rh(" GetPortStatus bye %x %x\n", ((u16 *)buf)[0],
 424                                                         ((u16 *)buf)[1]);
 425                 break;
 426         case SetHubFeature:
 427                 usbip_dbg_vhci_rh(" SetHubFeature\n");
 428                 retval = -EPIPE;
 429                 break;
 430         case SetPortFeature:
 431                 switch (wValue) {
 432                 case USB_PORT_FEAT_SUSPEND:
 433                         usbip_dbg_vhci_rh(" SetPortFeature: "
 434                                         "USB_PORT_FEAT_SUSPEND\n");
 435                         printk(KERN_ERR "%s: not yet\n", __func__);
 436 #if 0
 437                         dum->port_status[rhport] |=
 438                                                 (1 << USB_PORT_FEAT_SUSPEND);
 439                         if (dum->driver->suspend) {
 440                                 spin_unlock(&dum->lock);
 441                                 dum->driver->suspend(&dum->gadget);
 442                                 spin_lock(&dum->lock);
 443                         }
 444 #endif
 445                         break;
 446                 case USB_PORT_FEAT_RESET:
 447                         usbip_dbg_vhci_rh(" SetPortFeature: "
 448                                                 "USB_PORT_FEAT_RESET\n");
 449                         /* if it's already running, disconnect first */
 450                         if (dum->port_status[rhport] & USB_PORT_STAT_ENABLE) {
 451                                 dum->port_status[rhport] &=
 452                                                 ~(USB_PORT_STAT_ENABLE |
 453                                                   USB_PORT_STAT_LOW_SPEED |
 454                                                   USB_PORT_STAT_HIGH_SPEED);
 455 #if 0
 456                                 if (dum->driver) {
 457                                         dev_dbg(hardware, "disconnect\n");
 458                                         stop_activity(dum, dum->driver);
 459                                 }
 460 #endif
 461
 462                                 /* FIXME test that code path! */
 463                         }
 464                         /* 50msec reset signaling */
 465                         dum->re_timeout = jiffies + msecs_to_jiffies(50);
 466
 467                         /* FALLTHROUGH */
 468                 default:
 469                         usbip_dbg_vhci_rh(" SetPortFeature: default %d\n",
 470                                                                 wValue);
 471                         dum->port_status[rhport] |= (1 << wValue);
 472                 }
 473                 break;
 474
 475         default:
 476                 printk(KERN_ERR "%s: default: no such request\n", __func__);
 477                 /* dev_dbg (hardware,
 478                  *              "hub control req%04x v%04x i%04x l%d\n",
 479                  *              typeReq, wValue, wIndex, wLength); */
 480
 481                 /* "protocol stall" on error */
 482                 retval = -EPIPE;
 483         }
 484
 485         if (usbip_dbg_flag_vhci_rh) {
 486                 printk(KERN_DEBUG "port %d\n", rhport);
 487                 dump_port_status(prev_port_status[rhport]);
 488                 dump_port_status(dum->port_status[rhport]);
 489         }
 490         usbip_dbg_vhci_rh(" bye\n");
 491
 492         spin_unlock_irqrestore(&dum->lock, flags);
 493
 494         return retval;
 495 }
 496
 497
 498
 499 /*----------------------------------------------------------------------*/
 500
 501 static struct vhci_device *get_vdev(struct usb_device *udev)
 502 {
 503         int i;
 504
 505         if (!udev)
 506                 return NULL;
 507
 508         for (i = 0; i < VHCI_NPORTS; i++)
 509                 if (the_controller->vdev[i].udev == udev)
 510                         return port_to_vdev(i);
 511
 512         return NULL;
 513 }
 514
 515 static void vhci_tx_urb(struct urb *urb)
 516 {
 517         struct vhci_device *vdev = get_vdev(urb->dev);
 518         struct vhci_priv *priv;
 519         unsigned long flag;
 520
 521         if (!vdev) {
 522                 err("could not get virtual device");
 523                 /* BUG(); */
 524                 return;
 525         }
 526
 527         priv = kzalloc(sizeof(struct vhci_priv), GFP_ATOMIC);
 528
 529         spin_lock_irqsave(&vdev->priv_lock, flag);
 530
 531         if (!priv) {
 532                 dev_err(&urb->dev->dev, "malloc vhci_priv\n");
 533                 spin_unlock_irqrestore(&vdev->priv_lock, flag);
 534                 usbip_event_add(&vdev->ud, VDEV_EVENT_ERROR_MALLOC);
 535                 return;
 536         }
 537
 538         priv->seqnum = atomic_inc_return(&the_controller->seqnum);
 539         if (priv->seqnum == 0xffff)
 540                 usbip_uinfo("seqnum max\n");
 541
 542         priv->vdev = vdev;
 543         priv->urb = urb;
 544
 545         urb->hcpriv = (void *) priv;
 546
 547
 548         list_add_tail(&priv->list, &vdev->priv_tx);
 549
 550         wake_up(&vdev->waitq_tx);
 551         spin_unlock_irqrestore(&vdev->priv_lock, flag);
 552 }
 553
 554 static int vhci_urb_enqueue(struct usb_hcd *hcd, struct urb *urb,
 555                             gfp_t mem_flags)
 556 {
 557         struct device *dev = &urb->dev->dev;
 558         int ret = 0;
 559         unsigned long flags;
 560         struct vhci_device *vdev;
 561
 562         usbip_dbg_vhci_hc("enter, usb_hcd %p urb %p mem_flags %d\n",
 563                     hcd, urb, mem_flags);
 564
 565         /* patch to usb_sg_init() is in 2.5.60 */
 566         BUG_ON(!urb->transfer_buffer && urb->transfer_buffer_length);
 567
 568         spin_lock_irqsave(&the_controller->lock, flags);
 569
 570         if (urb->status != -EINPROGRESS) {
 571                 dev_err(dev, "URB already unlinked!, status %d\n", urb->status);
 572                 spin_unlock_irqrestore(&the_controller->lock, flags);
 573                 return urb->status;
 574         }
 575
 576         vdev = port_to_vdev(urb->dev->portnum-1);
 577
 578         /* refuse enqueue for dead connection */
 579         spin_lock(&vdev->ud.lock);
 580         if (vdev->ud.status == VDEV_ST_NULL || vdev->ud.status == VDEV_ST_ERROR) {
 581                 usbip_uerr("enqueue for inactive port %d\n", vdev->rhport);
 582                 spin_unlock(&vdev->ud.lock);
 583                 spin_unlock_irqrestore(&the_controller->lock, flags);
 584                 return -ENODEV;
 585         }
 586         spin_unlock(&vdev->ud.lock);
 587
 588         ret = usb_hcd_link_urb_to_ep(hcd, urb);
 589         if (ret)
 590                 goto no_need_unlink;
 591
 592         /*
 593          * The enumeration process is as follows;
 594          *
 595          *  1. Get_Descriptor request to DevAddrs(0) EndPoint(0)
 596          *     to get max packet length of default pipe
 597          *
 598          *  2. Set_Address request to DevAddr(0) EndPoint(0)
 599          *
 600          */
 601
 602         if (usb_pipedevice(urb->pipe) == 0) {
 603                 __u8 type = usb_pipetype(urb->pipe);
 604                 struct usb_ctrlrequest *ctrlreq =
 605                                 (struct usb_ctrlrequest *) urb->setup_packet;
 606
 607                 if (type != PIPE_CONTROL || !ctrlreq) {
 608                         dev_err(dev, "invalid request to devnum 0\n");
 609                         ret = -EINVAL;
 610                         goto no_need_xmit;
 611                 }
 612
 613                 switch (ctrlreq->bRequest) {
 614                 case USB_REQ_SET_ADDRESS:
 615                         /* set_address may come when a device is reset */
 616                         dev_info(dev, "SetAddress Request (%d) to port %d\n",
 617                                  ctrlreq->wValue, vdev->rhport);
 618
 619                         if (vdev->udev)
 620                                 usb_put_dev(vdev->udev);
 621                         vdev->udev = usb_get_dev(urb->dev);
 622
 623                         spin_lock(&vdev->ud.lock);
 624                         vdev->ud.status = VDEV_ST_USED;
 625                         spin_unlock(&vdev->ud.lock);
 626
 627                         if (urb->status == -EINPROGRESS) {
 628                                 /* This request is successfully completed. */
 629                                 /* If not -EINPROGRESS, possibly unlinked. */
 630                                 urb->status = 0;
 631                         }
 632
 633                         goto no_need_xmit;
 634
 635                 case USB_REQ_GET_DESCRIPTOR:
 636                         if (ctrlreq->wValue == (USB_DT_DEVICE << 8))
 637                                 usbip_dbg_vhci_hc("Not yet?: "
 638                                                 "Get_Descriptor to device 0 "
 639                                                 "(get max pipe size)\n");
 640
 641                         if (vdev->udev)
 642                                 usb_put_dev(vdev->udev);
 643                         vdev->udev = usb_get_dev(urb->dev);
 644                         goto out;
 645
 646                 default:
 647                         /* NOT REACHED */
 648                         dev_err(dev, "invalid request to devnum 0 bRequest %u, "
 649                                 "wValue %u\n", ctrlreq->bRequest,
 650                                 ctrlreq->wValue);
 651                         ret =  -EINVAL;
 652                         goto no_need_xmit;
 653                 }
 654
 655         }
 656
 657 out:
 658         vhci_tx_urb(urb);
 659
 660         spin_unlock_irqrestore(&the_controller->lock, flags);
 661
 662         return 0;
 663
 664 no_need_xmit:
 665         usb_hcd_unlink_urb_from_ep(hcd, urb);
 666 no_need_unlink:
 667         spin_unlock_irqrestore(&the_controller->lock, flags);
 668
 669         usb_hcd_giveback_urb(vhci_to_hcd(the_controller), urb, urb->status);
 670
 671         return ret;
 672 }
 673
 674 /*
 675  * vhci_rx gives back the urb after receiving the reply of the urb.  If an
 676  * unlink pdu is sent or not, vhci_rx receives a normal return pdu and gives
 677  * back its urb. For the driver unlinking the urb, the content of the urb is
 678  * not important, but the calling to its completion handler is important; the
 679  * completion of unlinking is notified by the completion handler.
 680  *
 681  *
 682  * CLIENT SIDE
 683  *
 684  * - When vhci_hcd receives RET_SUBMIT,
 685  *
 686  *      - case 1a). the urb of the pdu is not unlinking.
 687  *              - normal case
 688  *              => just give back the urb
 689  *
 690  *      - case 1b). the urb of the pdu is unlinking.
 691  *              - usbip.ko will return a reply of the unlinking request.
 692  *              => give back the urb now and go to case 2b).
 693  *
 694  * - When vhci_hcd receives RET_UNLINK,
 695  *
 696  *      - case 2a). a submit request is still pending in vhci_hcd.
 697  *              - urb was really pending in usbip.ko and urb_unlink_urb() was
 698  *                completed there.
 699  *              => free a pending submit request
 700  *              => notify unlink completeness by giving back the urb
 701  *
 702  *      - case 2b). a submit request is *not* pending in vhci_hcd.
 703  *              - urb was already given back to the core driver.
 704  *              => do not give back the urb
 705  *
 706  *
 707  * SERVER SIDE
 708  *
 709  * - When usbip receives CMD_UNLINK,
 710  *
 711  *      - case 3a). the urb of the unlink request is now in submission.
 712  *              => do usb_unlink_urb().
 713  *              => after the unlink is completed, send RET_UNLINK.
 714  *
 715  *      - case 3b). the urb of the unlink request is not in submission.
 716  *              - may be already completed or never be received
 717  *              => send RET_UNLINK
 718  *
 719  */
 720 static int vhci_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
 721 {
 722         unsigned long flags;
 723         struct vhci_priv *priv;
 724         struct vhci_device *vdev;
 725
 726         usbip_uinfo("vhci_hcd: dequeue a urb %p\n", urb);
 727
 728
 729         spin_lock_irqsave(&the_controller->lock, flags);
 730
 731         priv = urb->hcpriv;
 732         if (!priv) {
 733                 /* URB was never linked! or will be soon given back by
 734                  * vhci_rx. */
 735                 spin_unlock_irqrestore(&the_controller->lock, flags);
 736                 return 0;
 737         }
 738
 739         {
 740                 int ret = 0;
 741                 ret = usb_hcd_check_unlink_urb(hcd, urb, status);
 742                 if (ret) {
 743                         spin_unlock_irqrestore(&the_controller->lock, flags);
 744                         return ret;
 745                 }
 746         }
 747
 748          /* send unlink request here? */
 749         vdev = priv->vdev;
 750
 751         if (!vdev->ud.tcp_socket) {
 752                 /* tcp connection is closed */
 753                 unsigned long flags2;
 754
 755                 spin_lock_irqsave(&vdev->priv_lock, flags2);
 756
 757                 usbip_uinfo("vhci_hcd: device %p seems to be disconnected\n",
 758                                                                         vdev);
 759                 list_del(&priv->list);
 760                 kfree(priv);
 761                 urb->hcpriv = NULL;
 762
 763                 spin_unlock_irqrestore(&vdev->priv_lock, flags2);
 764
 765                 /*
 766                  * If tcp connection is alive, we have sent CMD_UNLINK.
 767                  * vhci_rx will receive RET_UNLINK and give back the URB.
 768                  * Otherwise, we give back it here.
 769                  */
 770                 usbip_uinfo("vhci_hcd: vhci_urb_dequeue() gives back urb %p\n",
 771                                                                         urb);
 772
 773                 usb_hcd_unlink_urb_from_ep(hcd, urb);
 774
 775                 spin_unlock_irqrestore(&the_controller->lock, flags);
 776                 usb_hcd_giveback_urb(vhci_to_hcd(the_controller), urb,
 777                                                                 urb->status);
 778                 spin_lock_irqsave(&the_controller->lock, flags);
 779
 780         } else {
 781                 /* tcp connection is alive */
 782                 unsigned long flags2;
 783                 struct vhci_unlink *unlink;
 784
 785                 spin_lock_irqsave(&vdev->priv_lock, flags2);
 786
 787                 /* setup CMD_UNLINK pdu */
 788                 unlink = kzalloc(sizeof(struct vhci_unlink), GFP_ATOMIC);
 789                 if (!unlink) {
 790                         usbip_uerr("malloc vhci_unlink\n");
 791                         spin_unlock_irqrestore(&vdev->priv_lock, flags2);
 792                         spin_unlock_irqrestore(&the_controller->lock, flags);
 793                         usbip_event_add(&vdev->ud, VDEV_EVENT_ERROR_MALLOC);
 794                         return -ENOMEM;
 795                 }
 796
 797                 unlink->seqnum = atomic_inc_return(&the_controller->seqnum);
 798                 if (unlink->seqnum == 0xffff)
 799                         usbip_uinfo("seqnum max\n");
 800
 801                 unlink->unlink_seqnum = priv->seqnum;
 802
 803                 usbip_uinfo("vhci_hcd: device %p seems to be still connected\n",
 804                                                                         vdev);
 805
 806                 /* send cmd_unlink and try to cancel the pending URB in the
 807                  * peer */
 808                 list_add_tail(&unlink->list, &vdev->unlink_tx);
 809                 wake_up(&vdev->waitq_tx);
 810
 811                 spin_unlock_irqrestore(&vdev->priv_lock, flags2);
 812         }
 813
 814         spin_unlock_irqrestore(&the_controller->lock, flags);
 815
 816         usbip_dbg_vhci_hc("leave\n");
 817         return 0;
 818 }
 819
 820 static void vhci_device_unlink_cleanup(struct vhci_device *vdev)
 821 {
 822         struct vhci_unlink *unlink, *tmp;
 823
 824         spin_lock(&vdev->priv_lock);
 825
 826         list_for_each_entry_safe(unlink, tmp, &vdev->unlink_tx, list) {
 827                 usbip_uinfo("unlink cleanup tx %lu\n", unlink->unlink_seqnum);
 828                 list_del(&unlink->list);
 829                 kfree(unlink);
 830         }
 831
 832         list_for_each_entry_safe(unlink, tmp, &vdev->unlink_rx, list) {
 833                 struct urb *urb;
 834
 835                 /* give back URB of unanswered unlink request */
 836                 usbip_uinfo("unlink cleanup rx %lu\n", unlink->unlink_seqnum);
 837
 838                 urb = pickup_urb_and_free_priv(vdev, unlink->unlink_seqnum);
 839                 if (!urb) {
 840                         usbip_uinfo("the urb (seqnum %lu) was already given back\n",
 841                                                         unlink->unlink_seqnum);
 842                         list_del(&unlink->list);
 843                         kfree(unlink);
 844                         continue;
 845                 }
 846
 847                 urb->status = -ENODEV;
 848
 849                 spin_lock(&the_controller->lock);
 850                 usb_hcd_unlink_urb_from_ep(vhci_to_hcd(the_controller), urb);
 851                 spin_unlock(&the_controller->lock);
 852
 853                 usb_hcd_giveback_urb(vhci_to_hcd(the_controller), urb, urb->status);
 854
 855                 list_del(&unlink->list);
 856                 kfree(unlink);
 857         }
 858
 859         spin_unlock(&vdev->priv_lock);
 860 }
 861
 862 /*
 863  * The important thing is that only one context begins cleanup.
 864  * This is why error handling and cleanup become simple.
 865  * We do not want to consider race condition as possible.
 866  */
 867 static void vhci_shutdown_connection(struct usbip_device *ud)
 868 {
 869         struct vhci_device *vdev = container_of(ud, struct vhci_device, ud);
 870
 871         /* need this? see stub_dev.c */
 872         if (ud->tcp_socket) {
 873                 usbip_udbg("shutdown tcp_socket %p\n", ud->tcp_socket);
 874                 kernel_sock_shutdown(ud->tcp_socket, SHUT_RDWR);
 875         }
 876
 877         usbip_stop_threads(&vdev->ud);
 878         usbip_uinfo("stop threads\n");
 879
 880         /* active connection is closed */
 881         if (vdev->ud.tcp_socket != NULL) {
 882                 sock_release(vdev->ud.tcp_socket);
 883                 vdev->ud.tcp_socket = NULL;
 884         }
 885         usbip_uinfo("release socket\n");
 886
 887         vhci_device_unlink_cleanup(vdev);
 888
 889         /*
 890          * rh_port_disconnect() is a trigger of ...
 891          *   usb_disable_device():
 892          *      disable all the endpoints for a USB device.
 893          *   usb_disable_endpoint():
 894          *      disable endpoints. pending urbs are unlinked(dequeued).
 895          *
 896          * NOTE: After calling rh_port_disconnect(), the USB device drivers of a
 897          * deteched device should release used urbs in a cleanup function(i.e.
 898          * xxx_disconnect()). Therefore, vhci_hcd does not need to release
 899          * pushed urbs and their private data in this function.
 900          *
 901          * NOTE: vhci_dequeue() must be considered carefully. When shutdowning
 902          * a connection, vhci_shutdown_connection() expects vhci_dequeue()
 903          * gives back pushed urbs and frees their private data by request of
 904          * the cleanup function of a USB driver. When unlinking a urb with an
 905          * active connection, vhci_dequeue() does not give back the urb which
 906          * is actually given back by vhci_rx after receiving its return pdu.
 907          *
 908          */
 909         rh_port_disconnect(vdev->rhport);
 910
 911         usbip_uinfo("disconnect device\n");
 912 }
 913
 914
 915 static void vhci_device_reset(struct usbip_device *ud)
 916 {
 917         struct vhci_device *vdev = container_of(ud, struct vhci_device, ud);
 918
 919         spin_lock(&ud->lock);
 920
 921         vdev->speed  = 0;
 922         vdev->devid  = 0;
 923
 924         if (vdev->udev)
 925                 usb_put_dev(vdev->udev);
 926         vdev->udev = NULL;
 927
 928         ud->tcp_socket = NULL;
 929
 930         ud->status = VDEV_ST_NULL;
 931
 932         spin_unlock(&ud->lock);
 933 }
 934
 935 static void vhci_device_unusable(struct usbip_device *ud)
 936 {
 937         spin_lock(&ud->lock);
 938
 939         ud->status = VDEV_ST_ERROR;
 940
 941         spin_unlock(&ud->lock);
 942 }
 943
 944 static void vhci_device_init(struct vhci_device *vdev)
 945 {
 946         memset(vdev, 0, sizeof(*vdev));
 947
 948         usbip_task_init(&vdev->ud.tcp_rx, "vhci_rx", vhci_rx_loop);
 949         usbip_task_init(&vdev->ud.tcp_tx, "vhci_tx", vhci_tx_loop);
 950
 951         vdev->ud.side   = USBIP_VHCI;
 952         vdev->ud.status = VDEV_ST_NULL;
 953         /* vdev->ud.lock   = SPIN_LOCK_UNLOCKED; */
 954         spin_lock_init(&vdev->ud.lock);
 955
 956         INIT_LIST_HEAD(&vdev->priv_rx);
 957         INIT_LIST_HEAD(&vdev->priv_tx);
 958         INIT_LIST_HEAD(&vdev->unlink_tx);
 959         INIT_LIST_HEAD(&vdev->unlink_rx);
 960         /* vdev->priv_lock = SPIN_LOCK_UNLOCKED; */
 961         spin_lock_init(&vdev->priv_lock);
 962
 963         init_waitqueue_head(&vdev->waitq_tx);
 964
 965         vdev->ud.eh_ops.shutdown = vhci_shutdown_connection;
 966         vdev->ud.eh_ops.reset = vhci_device_reset;
 967         vdev->ud.eh_ops.unusable = vhci_device_unusable;
 968
 969         usbip_start_eh(&vdev->ud);
 970 }
 971
 972
 973 /*----------------------------------------------------------------------*/
 974
 975 static int vhci_start(struct usb_hcd *hcd)
 976 {
 977         struct vhci_hcd *vhci = hcd_to_vhci(hcd);
 978         int rhport;
 979         int err = 0;
 980
 981         usbip_dbg_vhci_hc("enter vhci_start\n");
 982
 983
 984         /* initialize private data of usb_hcd */
 985
 986         for (rhport = 0; rhport < VHCI_NPORTS; rhport++) {
 987                 struct vhci_device *vdev = &vhci->vdev[rhport];
 988                 vhci_device_init(vdev);
 989                 vdev->rhport = rhport;
 990         }
 991
 992         atomic_set(&vhci->seqnum, 0);
 993         spin_lock_init(&vhci->lock);
 994
 995
 996
 997         hcd->power_budget = 0; /* no limit */
 998         hcd->state  = HC_STATE_RUNNING;
 999         hcd->uses_new_polling = 1;
1000
1001
1002         /* vhci_hcd is now ready to be controlled through sysfs */
1003         err = sysfs_create_group(&vhci_dev(vhci)->kobj, &dev_attr_group);
1004         if (err) {
1005                 usbip_uerr("create sysfs files\n");
1006                 return err;
1007         }
1008
1009         return 0;
1010 }
1011
1012 static void vhci_stop(struct usb_hcd *hcd)
1013 {
1014         struct vhci_hcd *vhci = hcd_to_vhci(hcd);
1015         int rhport = 0;
1016
1017         usbip_dbg_vhci_hc("stop VHCI controller\n");
1018
1019
1020         /* 1. remove the userland interface of vhci_hcd */
1021         sysfs_remove_group(&vhci_dev(vhci)->kobj, &dev_attr_group);
1022
1023         /* 2. shutdown all the ports of vhci_hcd */
1024         for (rhport = 0 ; rhport < VHCI_NPORTS; rhport++) {
1025                 struct vhci_device *vdev = &vhci->vdev[rhport];
1026
1027                 usbip_event_add(&vdev->ud, VDEV_EVENT_REMOVED);
1028                 usbip_stop_eh(&vdev->ud);
1029         }
1030
1031
1032         usbip_uinfo("vhci_stop done\n");
1033 }
1034
1035 /*----------------------------------------------------------------------*/
1036
1037 static int vhci_get_frame_number(struct usb_hcd *hcd)
1038 {
1039         usbip_uerr("Not yet implemented\n");
1040         return 0;
1041 }
1042
1043
1044 #ifdef CONFIG_PM
1045
1046 /* FIXME: suspend/resume */
1047 static int vhci_bus_suspend(struct usb_hcd *hcd)
1048 {
1049         struct vhci_hcd *vhci = hcd_to_vhci(hcd);
1050
1051         dev_dbg(&hcd->self.root_hub->dev, "%s\n", __func__);
1052
1053         spin_lock_irq(&vhci->lock);
1054         /* vhci->rh_state = DUMMY_RH_SUSPENDED;
1055          * set_link_state(vhci); */
1056         hcd->state = HC_STATE_SUSPENDED;
1057         spin_unlock_irq(&vhci->lock);
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
1067         dev_dbg(&hcd->self.root_hub->dev, "%s\n", __func__);
1068
1069         spin_lock_irq(&vhci->lock);
1070         if (!HCD_HW_ACCESSIBLE(hcd)) {
1071                 rc = -ESHUTDOWN;
1072         } else {
1073                 /* vhci->rh_state = DUMMY_RH_RUNNING;
1074                  * set_link_state(vhci);
1075                  * if (!list_empty(&vhci->urbp_list))
1076                  *      mod_timer(&vhci->timer, jiffies); */
1077                 hcd->state = HC_STATE_RUNNING;
1078         }
1079         spin_unlock_irq(&vhci->lock);
1080         return rc;
1081
1082         return 0;
1083 }
1084
1085 #else
1086
1087 #define vhci_bus_suspend      NULL
1088 #define vhci_bus_resume       NULL
1089 #endif
1090
1091
1092
1093 static struct hc_driver vhci_hc_driver = {
1094         .description    = driver_name,
1095         .product_desc   = driver_desc,
1096         .hcd_priv_size  = sizeof(struct vhci_hcd),
1097
1098         .flags          = HCD_USB2,
1099
1100         .start          = vhci_start,
1101         .stop           = vhci_stop,
1102
1103         .urb_enqueue    = vhci_urb_enqueue,
1104         .urb_dequeue    = vhci_urb_dequeue,
1105
1106         .get_frame_number = vhci_get_frame_number,
1107
1108         .hub_status_data = vhci_hub_status,
1109         .hub_control    = vhci_hub_control,
1110         .bus_suspend    = vhci_bus_suspend,
1111         .bus_resume     = vhci_bus_resume,
1112 };
1113
1114 static int vhci_hcd_probe(struct platform_device *pdev)
1115 {
1116         struct usb_hcd          *hcd;
1117         int                     ret;
1118
1119         usbip_uinfo("proving...\n");
1120
1121         usbip_dbg_vhci_hc("name %s id %d\n", pdev->name, pdev->id);
1122
1123         /* will be removed */
1124         if (pdev->dev.dma_mask) {
1125                 dev_info(&pdev->dev, "vhci_hcd DMA not supported\n");
1126                 return -EINVAL;
1127         }
1128
1129         /*
1130          * Allocate and initialize hcd.
1131          * Our private data is also allocated automatically.
1132          */
1133         hcd = usb_create_hcd(&vhci_hc_driver, &pdev->dev, dev_name(&pdev->dev));
1134         if (!hcd) {
1135                 usbip_uerr("create hcd failed\n");
1136                 return -ENOMEM;
1137         }
1138
1139
1140         /* this is private data for vhci_hcd */
1141         the_controller = hcd_to_vhci(hcd);
1142
1143         /*
1144          * Finish generic HCD structure initialization and register.
1145          * Call the driver's reset() and start() routines.
1146          */
1147         ret = usb_add_hcd(hcd, 0, 0);
1148         if (ret != 0) {
1149                 usbip_uerr("usb_add_hcd failed %d\n", ret);
1150                 usb_put_hcd(hcd);
1151                 the_controller = NULL;
1152                 return ret;
1153         }
1154
1155
1156         usbip_dbg_vhci_hc("bye\n");
1157         return 0;
1158 }
1159
1160
1161 static int vhci_hcd_remove(struct platform_device *pdev)
1162 {
1163         struct usb_hcd  *hcd;
1164
1165         hcd = platform_get_drvdata(pdev);
1166         if (!hcd)
1167                 return 0;
1168
1169         /*
1170          * Disconnects the root hub,
1171          * then reverses the effects of usb_add_hcd(),
1172          * invoking the HCD's stop() methods.
1173          */
1174         usb_remove_hcd(hcd);
1175         usb_put_hcd(hcd);
1176         the_controller = NULL;
1177
1178
1179         return 0;
1180 }
1181
1182
1183
1184 #ifdef CONFIG_PM
1185
1186 /* what should happen for USB/IP under suspend/resume? */
1187 static int vhci_hcd_suspend(struct platform_device *pdev, pm_message_t state)
1188 {
1189         struct usb_hcd *hcd;
1190         int rhport = 0;
1191         int connected = 0;
1192         int ret = 0;
1193
1194         dev_dbg(&pdev->dev, "%s\n", __func__);
1195
1196         hcd = platform_get_drvdata(pdev);
1197
1198         spin_lock(&the_controller->lock);
1199
1200         for (rhport = 0; rhport < VHCI_NPORTS; rhport++)
1201                 if (the_controller->port_status[rhport] &
1202                                                 USB_PORT_STAT_CONNECTION)
1203                         connected += 1;
1204
1205         spin_unlock(&the_controller->lock);
1206
1207         if (connected > 0) {
1208                 usbip_uinfo("We have %d active connection%s. Do not suspend.\n",
1209                                 connected, (connected == 1 ? "" : "s"));
1210                 ret =  -EBUSY;
1211         } else {
1212                 usbip_uinfo("suspend vhci_hcd");
1213                 clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
1214         }
1215
1216         return ret;
1217 }
1218
1219 static int vhci_hcd_resume(struct platform_device *pdev)
1220 {
1221         struct usb_hcd *hcd;
1222
1223         dev_dbg(&pdev->dev, "%s\n", __func__);
1224
1225         hcd = platform_get_drvdata(pdev);
1226         set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
1227         usb_hcd_poll_rh_status(hcd);
1228
1229         return 0;
1230 }
1231
1232 #else
1233
1234 #define vhci_hcd_suspend        NULL
1235 #define vhci_hcd_resume         NULL
1236
1237 #endif
1238
1239
1240 static struct platform_driver vhci_driver = {
1241         .probe  = vhci_hcd_probe,
1242         .remove = __devexit_p(vhci_hcd_remove),
1243         .suspend = vhci_hcd_suspend,
1244         .resume = vhci_hcd_resume,
1245         .driver = {
1246                 .name = (char *) driver_name,
1247                 .owner = THIS_MODULE,
1248         },
1249 };
1250
1251 /*----------------------------------------------------------------------*/
1252
1253 /*
1254  * The VHCI 'device' is 'virtual'; not a real plug&play hardware.
1255  * We need to add this virtual device as a platform device arbitrarily:
1256  *      1. platform_device_register()
1257  */
1258 static void the_pdev_release(struct device *dev)
1259 {
1260         return;
1261 }
1262
1263 static struct platform_device the_pdev = {
1264         /* should be the same name as driver_name */
1265         .name = (char *) driver_name,
1266         .id = -1,
1267         .dev = {
1268                 /* .driver = &vhci_driver, */
1269                 .release = the_pdev_release,
1270         },
1271 };
1272
1273 static int __init vhci_init(void)
1274 {
1275         int ret;
1276
1277         usbip_dbg_vhci_hc("enter\n");
1278         if (usb_disabled())
1279                 return -ENODEV;
1280
1281         printk(KERN_INFO KBUILD_MODNAME ": %s, %s\n", driver_name,
1282                DRIVER_VERSION);
1283
1284         ret = platform_driver_register(&vhci_driver);
1285         if (ret < 0)
1286                 goto err_driver_register;
1287
1288         ret = platform_device_register(&the_pdev);
1289         if (ret < 0)
1290                 goto err_platform_device_register;
1291
1292         usbip_dbg_vhci_hc("bye\n");
1293         return ret;
1294
1295         /* error occurred */
1296 err_platform_device_register:
1297         platform_driver_unregister(&vhci_driver);
1298
1299 err_driver_register:
1300         usbip_dbg_vhci_hc("bye\n");
1301         return ret;
1302 }
1303 module_init(vhci_init);
1304
1305 static void __exit vhci_cleanup(void)
1306 {
1307         usbip_dbg_vhci_hc("enter\n");
1308
1309         platform_device_unregister(&the_pdev);
1310         platform_driver_unregister(&vhci_driver);
1311
1312         usbip_dbg_vhci_hc("bye\n");
1313 }
1314 module_exit(vhci_cleanup);