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 #include <linux/kthread.h>
  22
  23 #include "usbip_common.h"
  24 #include "vhci.h"
  25
  26 #define DRIVER_VERSION "1.0"
  27 #define DRIVER_AUTHOR "Takahiro Hirofuchi"
  28 #define DRIVER_DESC "Virtual Host Controller Interface Driver for USB/IP"
  29 #define DRIVER_LICENCE "GPL"
  30 MODULE_AUTHOR(DRIVER_AUTHOR);
  31 MODULE_DESCRIPTION(DRIVER_DESC);
  32 MODULE_LICENSE(DRIVER_LICENCE);
  33
  34
  35
  36 /*
  37  * TODO
  38  *      - update root hub emulation
  39  *      - move the emulation code to userland ?
  40  *              porting to other operating systems
  41  *              minimize kernel code
  42  *      - add suspend/resume code
  43  *      - clean up everything
  44  */
  45
  46
  47 /* See usb gadget dummy hcd */
  48
  49
  50 static int vhci_hub_status(struct usb_hcd *hcd, char *buff);
  51 static int vhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
  52                 u16 wIndex, char *buff, u16 wLength);
  53 static int vhci_urb_enqueue(struct usb_hcd *hcd, struct urb *urb,
  54                                                         gfp_t mem_flags);
  55 static int vhci_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status);
  56 static int vhci_start(struct usb_hcd *vhci_hcd);
  57 static void vhci_stop(struct usb_hcd *hcd);
  58 static int vhci_get_frame_number(struct usb_hcd *hcd);
  59
  60 static const char driver_name[] = "vhci_hcd";
  61 static const char driver_desc[] = "USB/IP Virtual Host Controller";
  62
  63 struct vhci_hcd *the_controller;
  64
  65 static const char *bit_desc[] = {
  66         "CONNECTION",           /*0*/
  67         "ENABLE",               /*1*/
  68         "SUSPEND",              /*2*/
  69         "OVER_CURRENT",         /*3*/
  70         "RESET",                /*4*/
  71         "R5",           /*5*/
  72         "R6",           /*6*/
  73         "R7",           /*7*/
  74         "POWER",                /*8*/
  75         "LOWSPEED",             /*9*/
  76         "HIGHSPEED",            /*10*/
  77         "PORT_TEST",            /*11*/
  78         "INDICATOR",            /*12*/
  79         "R13",          /*13*/
  80         "R14",          /*14*/
  81         "R15",          /*15*/
  82         "C_CONNECTION",         /*16*/
  83         "C_ENABLE",             /*17*/
  84         "C_SUSPEND",            /*18*/
  85         "C_OVER_CURRENT",       /*19*/
  86         "C_RESET",              /*20*/
  87         "R21",          /*21*/
  88         "R22",          /*22*/
  89         "R23",          /*23*/
  90         "R24",          /*24*/
  91         "R25",          /*25*/
  92         "R26",          /*26*/
  93         "R27",          /*27*/
  94         "R28",          /*28*/
  95         "R29",          /*29*/
  96         "R30",          /*30*/
  97         "R31",          /*31*/
  98 };
  99
 100
 101 static void dump_port_status(u32 status)
 102 {
 103         int i = 0;
 104
 105         printk(KERN_DEBUG "status %08x:", status);
 106         for (i = 0; i < 32; i++) {
 107                 if (status & (1 << i))
 108                         printk(" %s", bit_desc[i]);
 109         }
 110
 111         printk("\n");
 112 }
 113
 114
 115
 116 void rh_port_connect(int rhport, enum usb_device_speed speed)
 117 {
 118         unsigned long   flags;
 119
 120         usbip_dbg_vhci_rh("rh_port_connect %d\n", rhport);
 121
 122         spin_lock_irqsave(&the_controller->lock, flags);
 123
 124         the_controller->port_status[rhport] |= USB_PORT_STAT_CONNECTION
 125                 | (1 << USB_PORT_FEAT_C_CONNECTION);
 126
 127         switch (speed) {
 128         case USB_SPEED_HIGH:
 129                 the_controller->port_status[rhport] |= USB_PORT_STAT_HIGH_SPEED;
 130                 break;
 131         case USB_SPEED_LOW:
 132                 the_controller->port_status[rhport] |= USB_PORT_STAT_LOW_SPEED;
 133                 break;
 134         default:
 135                 break;
 136         }
 137
 138         /* spin_lock(&the_controller->vdev[rhport].ud.lock);
 139          * the_controller->vdev[rhport].ud.status = VDEV_CONNECT;
 140          * spin_unlock(&the_controller->vdev[rhport].ud.lock); */
 141
 142         spin_unlock_irqrestore(&the_controller->lock, flags);
 143
 144         usb_hcd_poll_rh_status(vhci_to_hcd(the_controller));
 145 }
 146
 147 void rh_port_disconnect(int rhport)
 148 {
 149         unsigned long flags;
 150
 151         usbip_dbg_vhci_rh("rh_port_disconnect %d\n", rhport);
 152
 153         spin_lock_irqsave(&the_controller->lock, flags);
 154         /* stop_activity(dum, driver); */
 155         the_controller->port_status[rhport] &= ~USB_PORT_STAT_CONNECTION;
 156         the_controller->port_status[rhport] |=
 157                                         (1 << USB_PORT_FEAT_C_CONNECTION);
 158
 159
 160         /* not yet complete the disconnection
 161          * spin_lock(&vdev->ud.lock);
 162          * vdev->ud.status = VHC_ST_DISCONNECT;
 163          * spin_unlock(&vdev->ud.lock); */
 164
 165         spin_unlock_irqrestore(&the_controller->lock, flags);
 166
 167         usb_hcd_poll_rh_status(vhci_to_hcd(the_controller));
 168 }
 169
 170
 171
 172 /*----------------------------------------------------------------------*/
 173
 174 #define PORT_C_MASK \
 175         ((USB_PORT_STAT_C_CONNECTION \
 176           | USB_PORT_STAT_C_ENABLE \
 177           | USB_PORT_STAT_C_SUSPEND \
 178           | USB_PORT_STAT_C_OVERCURRENT \
 179           | USB_PORT_STAT_C_RESET) << 16)
 180
 181 /*
 182  * This function is almostly the same as dummy_hcd.c:dummy_hub_status() without
 183  * suspend/resume support. But, it is modified to provide multiple ports.
 184  *
 185  * @buf: a bitmap to show which port status has been changed.
 186  *  bit  0: reserved or used for another purpose?
 187  *  bit  1: the status of port 0 has been changed.
 188  *  bit  2: the status of port 1 has been changed.
 189  *  ...
 190  *  bit  7: the status of port 6 has been changed.
 191  *  bit  8: the status of port 7 has been changed.
 192  *  ...
 193  *  bit 15: the status of port 14 has been changed.
 194  *
 195  * So, the maximum number of ports is 31 ( port 0 to port 30) ?
 196  *
 197  * The return value is the actual transferred length in byte. If nothing has
 198  * been changed, return 0. In the case that the number of ports is less than or
 199  * equal to 6 (VHCI_NPORTS==7), return 1.
 200  *
 201  */
 202 static int vhci_hub_status(struct usb_hcd *hcd, char *buf)
 203 {
 204         struct vhci_hcd *vhci;
 205         unsigned long   flags;
 206         int             retval = 0;
 207
 208         /* the enough buffer is allocated according to USB_MAXCHILDREN */
 209         unsigned long   *event_bits = (unsigned long *) buf;
 210         int             rhport;
 211         int             changed = 0;
 212
 213
 214         *event_bits = 0;
 215
 216         vhci = hcd_to_vhci(hcd);
 217
 218         spin_lock_irqsave(&vhci->lock, flags);
 219         if (!HCD_HW_ACCESSIBLE(hcd)) {
 220                 usbip_dbg_vhci_rh("hw accessible flag in on?\n");
 221                 goto done;
 222         }
 223
 224         /* check pseudo status register for each port */
 225         for (rhport = 0; rhport < VHCI_NPORTS; rhport++) {
 226                 if ((vhci->port_status[rhport] & PORT_C_MASK)) {
 227                         /* The status of a port has been changed, */
 228                         usbip_dbg_vhci_rh("port %d is changed\n", rhport);
 229
 230                         *event_bits |= 1 << (rhport + 1);
 231                         changed = 1;
 232                 }
 233         }
 234
 235         usbip_uinfo("changed %d\n", changed);
 236
 237         if (hcd->state == HC_STATE_SUSPENDED)
 238                 usb_hcd_resume_root_hub(hcd);
 239
 240         if (changed)
 241                 retval = 1 + (VHCI_NPORTS / 8);
 242         else
 243                 retval = 0;
 244
 245 done:
 246         spin_unlock_irqrestore(&vhci->lock, flags);
 247         return retval;
 248 }
 249
 250 /* See hub_configure in hub.c */
 251 static inline void hub_descriptor(struct usb_hub_descriptor *desc)
 252 {
 253         memset(desc, 0, sizeof(*desc));
 254         desc->bDescriptorType = 0x29;
 255         desc->bDescLength = 9;
 256         desc->wHubCharacteristics = (__force __u16)
 257                 (__constant_cpu_to_le16(0x0001));
 258         desc->bNbrPorts = VHCI_NPORTS;
 259         desc->u.hs.DeviceRemovable[0] = 0xff;
 260         desc->u.hs.DeviceRemovable[1] = 0xff;
 261 }
 262
 263 static int vhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
 264                             u16 wIndex, char *buf, u16 wLength)
 265 {
 266         struct vhci_hcd *dum;
 267         int             retval = 0;
 268         unsigned long   flags;
 269         int             rhport;
 270
 271         u32 prev_port_status[VHCI_NPORTS];
 272
 273         if (!HCD_HW_ACCESSIBLE(hcd))
 274                 return -ETIMEDOUT;
 275
 276         /*
 277          * NOTE:
 278          * wIndex shows the port number and begins from 1.
 279          */
 280         usbip_dbg_vhci_rh("typeReq %x wValue %x wIndex %x\n", typeReq, wValue,
 281                                                                 wIndex);
 282         if (wIndex > VHCI_NPORTS)
 283                 printk(KERN_ERR "%s: invalid port number %d\n", __func__,
 284                                                                 wIndex);
 285         rhport = ((__u8)(wIndex & 0x00ff)) - 1;
 286
 287         dum = hcd_to_vhci(hcd);
 288
 289         spin_lock_irqsave(&dum->lock, flags);
 290
 291         /* store old status and compare now and old later */
 292         if (usbip_dbg_flag_vhci_rh) {
 293                 int i = 0;
 294                 for (i = 0; i < VHCI_NPORTS; i++)
 295                         prev_port_status[i] = dum->port_status[i];
 296         }
 297
 298         switch (typeReq) {
 299         case ClearHubFeature:
 300                 usbip_dbg_vhci_rh(" ClearHubFeature\n");
 301                 break;
 302         case ClearPortFeature:
 303                 switch (wValue) {
 304                 case USB_PORT_FEAT_SUSPEND:
 305                         if (dum->port_status[rhport] & USB_PORT_STAT_SUSPEND) {
 306                                 /* 20msec signaling */
 307                                 dum->resuming = 1;
 308                                 dum->re_timeout =
 309                                         jiffies + msecs_to_jiffies(20);
 310                         }
 311                         break;
 312                 case USB_PORT_FEAT_POWER:
 313                         usbip_dbg_vhci_rh(" ClearPortFeature: "
 314                                                 "USB_PORT_FEAT_POWER\n");
 315                         dum->port_status[rhport] = 0;
 316                         /* dum->address = 0; */
 317                         /* dum->hdev = 0; */
 318                         dum->resuming = 0;
 319                         break;
 320                 case USB_PORT_FEAT_C_RESET:
 321                         usbip_dbg_vhci_rh(" ClearPortFeature: "
 322                                                 "USB_PORT_FEAT_C_RESET\n");
 323                         switch (dum->vdev[rhport].speed) {
 324                         case USB_SPEED_HIGH:
 325                                 dum->port_status[rhport] |=
 326                                                 USB_PORT_STAT_HIGH_SPEED;
 327                                 break;
 328                         case USB_SPEED_LOW:
 329                                 dum->port_status[rhport] |=
 330                                                 USB_PORT_STAT_LOW_SPEED;
 331                                 break;
 332                         default:
 333                                 break;
 334                         }
 335                 default:
 336                         usbip_dbg_vhci_rh(" ClearPortFeature: default %x\n",
 337                                                                 wValue);
 338                         dum->port_status[rhport] &= ~(1 << wValue);
 339                 }
 340                 break;
 341         case GetHubDescriptor:
 342                 usbip_dbg_vhci_rh(" GetHubDescriptor\n");
 343                 hub_descriptor((struct usb_hub_descriptor *) buf);
 344                 break;
 345         case GetHubStatus:
 346                 usbip_dbg_vhci_rh(" GetHubStatus\n");
 347                 *(__le32 *) buf = __constant_cpu_to_le32(0);
 348                 break;
 349         case GetPortStatus:
 350                 usbip_dbg_vhci_rh(" GetPortStatus port %x\n", wIndex);
 351                 if (wIndex > VHCI_NPORTS || wIndex < 1) {
 352                         printk(KERN_ERR "%s: invalid port number %d\n",
 353                                __func__, wIndex);
 354                         retval = -EPIPE;
 355                 }
 356
 357                 /* we do no care of resume. */
 358
 359                 /* whoever resets or resumes must GetPortStatus to
 360                  * complete it!!
 361                  *                                   */
 362                 if (dum->resuming && time_after(jiffies, dum->re_timeout)) {
 363                         printk(KERN_ERR "%s: not yet\n", __func__);
 364                         dum->port_status[rhport] |=
 365                                         (1 << USB_PORT_FEAT_C_SUSPEND);
 366                         dum->port_status[rhport] &=
 367                                         ~(1 << USB_PORT_FEAT_SUSPEND);
 368                         dum->resuming = 0;
 369                         dum->re_timeout = 0;
 370                         /* if (dum->driver && dum->driver->resume) {
 371                          *      spin_unlock (&dum->lock);
 372                          *      dum->driver->resume (&dum->gadget);
 373                          *      spin_lock (&dum->lock);
 374                          * } */
 375                 }
 376
 377                 if ((dum->port_status[rhport] & (1 << USB_PORT_FEAT_RESET)) !=
 378                                 0 && time_after(jiffies, dum->re_timeout)) {
 379                         dum->port_status[rhport] |=
 380                                                 (1 << USB_PORT_FEAT_C_RESET);
 381                         dum->port_status[rhport] &=
 382                                                 ~(1 << USB_PORT_FEAT_RESET);
 383                         dum->re_timeout = 0;
 384
 385                         if (dum->vdev[rhport].ud.status ==
 386                                                         VDEV_ST_NOTASSIGNED) {
 387                                 usbip_dbg_vhci_rh(" enable rhport %d "
 388                                                 "(status %u)\n",
 389                                                 rhport,
 390                                                 dum->vdev[rhport].ud.status);
 391                                 dum->port_status[rhport] |=
 392                                                         USB_PORT_STAT_ENABLE;
 393                         }
 394 #if 0
 395                         if (dum->driver) {
 396
 397                                 dum->port_status[rhport] |=
 398                                                         USB_PORT_STAT_ENABLE;
 399                                 /* give it the best speed we agree on */
 400                                 dum->gadget.speed = dum->driver->speed;
 401                                 dum->gadget.ep0->maxpacket = 64;
 402                                 switch (dum->gadget.speed) {
 403                                 case USB_SPEED_HIGH:
 404                                         dum->port_status[rhport] |=
 405                                         USB_PORT_STAT_HIGH_SPEED;
 406                                         break;
 407                                 case USB_SPEED_LOW:
 408                                         dum->gadget.ep0->maxpacket = 8;
 409                                         dum->port_status[rhport] |=
 410                                         USB_PORT_STAT_LOW_SPEED;
 411                                         break;
 412                                 default:
 413                                         dum->gadget.speed = USB_SPEED_FULL;
 414                                         break;
 415                                 }
 416                         }
 417 #endif
 418
 419                 }
 420                 ((u16 *) buf)[0] = cpu_to_le16(dum->port_status[rhport]);
 421                 ((u16 *) buf)[1] =
 422                                 cpu_to_le16(dum->port_status[rhport] >> 16);
 423
 424                 usbip_dbg_vhci_rh(" GetPortStatus bye %x %x\n", ((u16 *)buf)[0],
 425                                                         ((u16 *)buf)[1]);
 426                 break;
 427         case SetHubFeature:
 428                 usbip_dbg_vhci_rh(" SetHubFeature\n");
 429                 retval = -EPIPE;
 430                 break;
 431         case SetPortFeature:
 432                 switch (wValue) {
 433                 case USB_PORT_FEAT_SUSPEND:
 434                         usbip_dbg_vhci_rh(" SetPortFeature: "
 435                                         "USB_PORT_FEAT_SUSPEND\n");
 436                         printk(KERN_ERR "%s: not yet\n", __func__);
 437 #if 0
 438                         dum->port_status[rhport] |=
 439                                                 (1 << USB_PORT_FEAT_SUSPEND);
 440                         if (dum->driver->suspend) {
 441                                 spin_unlock(&dum->lock);
 442                                 dum->driver->suspend(&dum->gadget);
 443                                 spin_lock(&dum->lock);
 444                         }
 445 #endif
 446                         break;
 447                 case USB_PORT_FEAT_RESET:
 448                         usbip_dbg_vhci_rh(" SetPortFeature: "
 449                                                 "USB_PORT_FEAT_RESET\n");
 450                         /* if it's already running, disconnect first */
 451                         if (dum->port_status[rhport] & USB_PORT_STAT_ENABLE) {
 452                                 dum->port_status[rhport] &=
 453                                                 ~(USB_PORT_STAT_ENABLE |
 454                                                   USB_PORT_STAT_LOW_SPEED |
 455                                                   USB_PORT_STAT_HIGH_SPEED);
 456 #if 0
 457                                 if (dum->driver) {
 458                                         dev_dbg(hardware, "disconnect\n");
 459                                         stop_activity(dum, dum->driver);
 460                                 }
 461 #endif
 462
 463                                 /* FIXME test that code path! */
 464                         }
 465                         /* 50msec reset signaling */
 466                         dum->re_timeout = jiffies + msecs_to_jiffies(50);
 467
 468                         /* FALLTHROUGH */
 469                 default:
 470                         usbip_dbg_vhci_rh(" SetPortFeature: default %d\n",
 471                                                                 wValue);
 472                         dum->port_status[rhport] |= (1 << wValue);
 473                 }
 474                 break;
 475
 476         default:
 477                 printk(KERN_ERR "%s: default: no such request\n", __func__);
 478                 /* dev_dbg (hardware,
 479                  *              "hub control req%04x v%04x i%04x l%d\n",
 480                  *              typeReq, wValue, wIndex, wLength); */
 481
 482                 /* "protocol stall" on error */
 483                 retval = -EPIPE;
 484         }
 485
 486         if (usbip_dbg_flag_vhci_rh) {
 487                 printk(KERN_DEBUG "port %d\n", rhport);
 488                 dump_port_status(prev_port_status[rhport]);
 489                 dump_port_status(dum->port_status[rhport]);
 490         }
 491         usbip_dbg_vhci_rh(" bye\n");
 492
 493         spin_unlock_irqrestore(&dum->lock, flags);
 494
 495         return retval;
 496 }
 497
 498
 499
 500 /*----------------------------------------------------------------------*/
 501
 502 static struct vhci_device *get_vdev(struct usb_device *udev)
 503 {
 504         int i;
 505
 506         if (!udev)
 507                 return NULL;
 508
 509         for (i = 0; i < VHCI_NPORTS; i++)
 510                 if (the_controller->vdev[i].udev == udev)
 511                         return port_to_vdev(i);
 512
 513         return NULL;
 514 }
 515
 516 static void vhci_tx_urb(struct urb *urb)
 517 {
 518         struct vhci_device *vdev = get_vdev(urb->dev);
 519         struct vhci_priv *priv;
 520         unsigned long flag;
 521
 522         if (!vdev) {
 523                 err("could not get virtual device");
 524                 /* BUG(); */
 525                 return;
 526         }
 527
 528         priv = kzalloc(sizeof(struct vhci_priv), GFP_ATOMIC);
 529
 530         spin_lock_irqsave(&vdev->priv_lock, flag);
 531
 532         if (!priv) {
 533                 dev_err(&urb->dev->dev, "malloc vhci_priv\n");
 534                 spin_unlock_irqrestore(&vdev->priv_lock, flag);
 535                 usbip_event_add(&vdev->ud, VDEV_EVENT_ERROR_MALLOC);
 536                 return;
 537         }
 538
 539         priv->seqnum = atomic_inc_return(&the_controller->seqnum);
 540         if (priv->seqnum == 0xffff)
 541                 usbip_uinfo("seqnum max\n");
 542
 543         priv->vdev = vdev;
 544         priv->urb = urb;
 545
 546         urb->hcpriv = (void *) priv;
 547
 548
 549         list_add_tail(&priv->list, &vdev->priv_tx);
 550
 551         wake_up(&vdev->waitq_tx);
 552         spin_unlock_irqrestore(&vdev->priv_lock, flag);
 553 }
 554
 555 static int vhci_urb_enqueue(struct usb_hcd *hcd, struct urb *urb,
 556                             gfp_t mem_flags)
 557 {
 558         struct device *dev = &urb->dev->dev;
 559         int ret = 0;
 560         unsigned long flags;
 561         struct vhci_device *vdev;
 562
 563         usbip_dbg_vhci_hc("enter, usb_hcd %p urb %p mem_flags %d\n",
 564                     hcd, urb, mem_flags);
 565
 566         /* patch to usb_sg_init() is in 2.5.60 */
 567         BUG_ON(!urb->transfer_buffer && urb->transfer_buffer_length);
 568
 569         spin_lock_irqsave(&the_controller->lock, flags);
 570
 571         if (urb->status != -EINPROGRESS) {
 572                 dev_err(dev, "URB already unlinked!, status %d\n", urb->status);
 573                 spin_unlock_irqrestore(&the_controller->lock, flags);
 574                 return urb->status;
 575         }
 576
 577         vdev = port_to_vdev(urb->dev->portnum-1);
 578
 579         /* refuse enqueue for dead connection */
 580         spin_lock(&vdev->ud.lock);
 581         if (vdev->ud.status == VDEV_ST_NULL || vdev->ud.status == VDEV_ST_ERROR) {
 582                 usbip_uerr("enqueue for inactive port %d\n", vdev->rhport);
 583                 spin_unlock(&vdev->ud.lock);
 584                 spin_unlock_irqrestore(&the_controller->lock, flags);
 585                 return -ENODEV;
 586         }
 587         spin_unlock(&vdev->ud.lock);
 588
 589         ret = usb_hcd_link_urb_to_ep(hcd, urb);
 590         if (ret)
 591                 goto no_need_unlink;
 592
 593         /*
 594          * The enumeration process is as follows;
 595          *
 596          *  1. Get_Descriptor request to DevAddrs(0) EndPoint(0)
 597          *     to get max packet length of default pipe
 598          *
 599          *  2. Set_Address request to DevAddr(0) EndPoint(0)
 600          *
 601          */
 602
 603         if (usb_pipedevice(urb->pipe) == 0) {
 604                 __u8 type = usb_pipetype(urb->pipe);
 605                 struct usb_ctrlrequest *ctrlreq =
 606                                 (struct usb_ctrlrequest *) urb->setup_packet;
 607
 608                 if (type != PIPE_CONTROL || !ctrlreq) {
 609                         dev_err(dev, "invalid request to devnum 0\n");
 610                         ret = -EINVAL;
 611                         goto no_need_xmit;
 612                 }
 613
 614                 switch (ctrlreq->bRequest) {
 615                 case USB_REQ_SET_ADDRESS:
 616                         /* set_address may come when a device is reset */
 617                         dev_info(dev, "SetAddress Request (%d) to port %d\n",
 618                                  ctrlreq->wValue, vdev->rhport);
 619
 620                         if (vdev->udev)
 621                                 usb_put_dev(vdev->udev);
 622                         vdev->udev = usb_get_dev(urb->dev);
 623
 624                         spin_lock(&vdev->ud.lock);
 625                         vdev->ud.status = VDEV_ST_USED;
 626                         spin_unlock(&vdev->ud.lock);
 627
 628                         if (urb->status == -EINPROGRESS) {
 629                                 /* This request is successfully completed. */
 630                                 /* If not -EINPROGRESS, possibly unlinked. */
 631                                 urb->status = 0;
 632                         }
 633
 634                         goto no_need_xmit;
 635
 636                 case USB_REQ_GET_DESCRIPTOR:
 637                         if (ctrlreq->wValue == (USB_DT_DEVICE << 8))
 638                                 usbip_dbg_vhci_hc("Not yet?: "
 639                                                 "Get_Descriptor to device 0 "
 640                                                 "(get max pipe size)\n");
 641
 642                         if (vdev->udev)
 643                                 usb_put_dev(vdev->udev);
 644                         vdev->udev = usb_get_dev(urb->dev);
 645                         goto out;
 646
 647                 default:
 648                         /* NOT REACHED */
 649                         dev_err(dev, "invalid request to devnum 0 bRequest %u, "
 650                                 "wValue %u\n", ctrlreq->bRequest,
 651                                 ctrlreq->wValue);
 652                         ret =  -EINVAL;
 653                         goto no_need_xmit;
 654                 }
 655
 656         }
 657
 658 out:
 659         vhci_tx_urb(urb);
 660
 661         spin_unlock_irqrestore(&the_controller->lock, flags);
 662
 663         return 0;
 664
 665 no_need_xmit:
 666         usb_hcd_unlink_urb_from_ep(hcd, urb);
 667 no_need_unlink:
 668         spin_unlock_irqrestore(&the_controller->lock, flags);
 669
 670         usb_hcd_giveback_urb(vhci_to_hcd(the_controller), urb, urb->status);
 671
 672         return ret;
 673 }
 674
 675 /*
 676  * vhci_rx gives back the urb after receiving the reply of the urb.  If an
 677  * unlink pdu is sent or not, vhci_rx receives a normal return pdu and gives
 678  * back its urb. For the driver unlinking the urb, the content of the urb is
 679  * not important, but the calling to its completion handler is important; the
 680  * completion of unlinking is notified by the completion handler.
 681  *
 682  *
 683  * CLIENT SIDE
 684  *
 685  * - When vhci_hcd receives RET_SUBMIT,
 686  *
 687  *      - case 1a). the urb of the pdu is not unlinking.
 688  *              - normal case
 689  *              => just give back the urb
 690  *
 691  *      - case 1b). the urb of the pdu is unlinking.
 692  *              - usbip.ko will return a reply of the unlinking request.
 693  *              => give back the urb now and go to case 2b).
 694  *
 695  * - When vhci_hcd receives RET_UNLINK,
 696  *
 697  *      - case 2a). a submit request is still pending in vhci_hcd.
 698  *              - urb was really pending in usbip.ko and urb_unlink_urb() was
 699  *                completed there.
 700  *              => free a pending submit request
 701  *              => notify unlink completeness by giving back the urb
 702  *
 703  *      - case 2b). a submit request is *not* pending in vhci_hcd.
 704  *              - urb was already given back to the core driver.
 705  *              => do not give back the urb
 706  *
 707  *
 708  * SERVER SIDE
 709  *
 710  * - When usbip receives CMD_UNLINK,
 711  *
 712  *      - case 3a). the urb of the unlink request is now in submission.
 713  *              => do usb_unlink_urb().
 714  *              => after the unlink is completed, send RET_UNLINK.
 715  *
 716  *      - case 3b). the urb of the unlink request is not in submission.
 717  *              - may be already completed or never be received
 718  *              => send RET_UNLINK
 719  *
 720  */
 721 static int vhci_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
 722 {
 723         unsigned long flags;
 724         struct vhci_priv *priv;
 725         struct vhci_device *vdev;
 726
 727         usbip_uinfo("vhci_hcd: dequeue a urb %p\n", urb);
 728
 729
 730         spin_lock_irqsave(&the_controller->lock, flags);
 731
 732         priv = urb->hcpriv;
 733         if (!priv) {
 734                 /* URB was never linked! or will be soon given back by
 735                  * vhci_rx. */
 736                 spin_unlock_irqrestore(&the_controller->lock, flags);
 737                 return 0;
 738         }
 739
 740         {
 741                 int ret = 0;
 742                 ret = usb_hcd_check_unlink_urb(hcd, urb, status);
 743                 if (ret) {
 744                         spin_unlock_irqrestore(&the_controller->lock, flags);
 745                         return ret;
 746                 }
 747         }
 748
 749          /* send unlink request here? */
 750         vdev = priv->vdev;
 751
 752         if (!vdev->ud.tcp_socket) {
 753                 /* tcp connection is closed */
 754                 unsigned long flags2;
 755
 756                 spin_lock_irqsave(&vdev->priv_lock, flags2);
 757
 758                 usbip_uinfo("vhci_hcd: device %p seems to be disconnected\n",
 759                                                                         vdev);
 760                 list_del(&priv->list);
 761                 kfree(priv);
 762                 urb->hcpriv = NULL;
 763
 764                 spin_unlock_irqrestore(&vdev->priv_lock, flags2);
 765
 766                 /*
 767                  * If tcp connection is alive, we have sent CMD_UNLINK.
 768                  * vhci_rx will receive RET_UNLINK and give back the URB.
 769                  * Otherwise, we give back it here.
 770                  */
 771                 usbip_uinfo("vhci_hcd: vhci_urb_dequeue() gives back urb %p\n",
 772                                                                         urb);
 773
 774                 usb_hcd_unlink_urb_from_ep(hcd, urb);
 775
 776                 spin_unlock_irqrestore(&the_controller->lock, flags);
 777                 usb_hcd_giveback_urb(vhci_to_hcd(the_controller), urb,
 778                                                                 urb->status);
 779                 spin_lock_irqsave(&the_controller->lock, flags);
 780
 781         } else {
 782                 /* tcp connection is alive */
 783                 unsigned long flags2;
 784                 struct vhci_unlink *unlink;
 785
 786                 spin_lock_irqsave(&vdev->priv_lock, flags2);
 787
 788                 /* setup CMD_UNLINK pdu */
 789                 unlink = kzalloc(sizeof(struct vhci_unlink), GFP_ATOMIC);
 790                 if (!unlink) {
 791                         usbip_uerr("malloc vhci_unlink\n");
 792                         spin_unlock_irqrestore(&vdev->priv_lock, flags2);
 793                         spin_unlock_irqrestore(&the_controller->lock, flags);
 794                         usbip_event_add(&vdev->ud, VDEV_EVENT_ERROR_MALLOC);
 795                         return -ENOMEM;
 796                 }
 797
 798                 unlink->seqnum = atomic_inc_return(&the_controller->seqnum);
 799                 if (unlink->seqnum == 0xffff)
 800                         usbip_uinfo("seqnum max\n");
 801
 802                 unlink->unlink_seqnum = priv->seqnum;
 803
 804                 usbip_uinfo("vhci_hcd: device %p seems to be still connected\n",
 805                                                                         vdev);
 806
 807                 /* send cmd_unlink and try to cancel the pending URB in the
 808                  * peer */
 809                 list_add_tail(&unlink->list, &vdev->unlink_tx);
 810                 wake_up(&vdev->waitq_tx);
 811
 812                 spin_unlock_irqrestore(&vdev->priv_lock, flags2);
 813         }
 814
 815         spin_unlock_irqrestore(&the_controller->lock, flags);
 816
 817         usbip_dbg_vhci_hc("leave\n");
 818         return 0;
 819 }
 820
 821 static void vhci_device_unlink_cleanup(struct vhci_device *vdev)
 822 {
 823         struct vhci_unlink *unlink, *tmp;
 824
 825         spin_lock(&vdev->priv_lock);
 826
 827         list_for_each_entry_safe(unlink, tmp, &vdev->unlink_tx, list) {
 828                 usbip_uinfo("unlink cleanup tx %lu\n", unlink->unlink_seqnum);
 829                 list_del(&unlink->list);
 830                 kfree(unlink);
 831         }
 832
 833         list_for_each_entry_safe(unlink, tmp, &vdev->unlink_rx, list) {
 834                 struct urb *urb;
 835
 836                 /* give back URB of unanswered unlink request */
 837                 usbip_uinfo("unlink cleanup rx %lu\n", unlink->unlink_seqnum);
 838
 839                 urb = pickup_urb_and_free_priv(vdev, unlink->unlink_seqnum);
 840                 if (!urb) {
 841                         usbip_uinfo("the urb (seqnum %lu) was already given back\n",
 842                                                         unlink->unlink_seqnum);
 843                         list_del(&unlink->list);
 844                         kfree(unlink);
 845                         continue;
 846                 }
 847
 848                 urb->status = -ENODEV;
 849
 850                 spin_lock(&the_controller->lock);
 851                 usb_hcd_unlink_urb_from_ep(vhci_to_hcd(the_controller), urb);
 852                 spin_unlock(&the_controller->lock);
 853
 854                 usb_hcd_giveback_urb(vhci_to_hcd(the_controller), urb, urb->status);
 855
 856                 list_del(&unlink->list);
 857                 kfree(unlink);
 858         }
 859
 860         spin_unlock(&vdev->priv_lock);
 861 }
 862
 863 /*
 864  * The important thing is that only one context begins cleanup.
 865  * This is why error handling and cleanup become simple.
 866  * We do not want to consider race condition as possible.
 867  */
 868 static void vhci_shutdown_connection(struct usbip_device *ud)
 869 {
 870         struct vhci_device *vdev = container_of(ud, struct vhci_device, ud);
 871
 872         /* need this? see stub_dev.c */
 873         if (ud->tcp_socket) {
 874                 usbip_udbg("shutdown tcp_socket %p\n", ud->tcp_socket);
 875                 kernel_sock_shutdown(ud->tcp_socket, SHUT_RDWR);
 876         }
 877
 878         /* kill threads related to this sdev, if v.c. exists */
 879         kthread_stop(vdev->ud.tcp_rx);
 880         kthread_stop(vdev->ud.tcp_tx);
 881
 882         usbip_uinfo("stop threads\n");
 883
 884         /* active connection is closed */
 885         if (vdev->ud.tcp_socket != NULL) {
 886                 sock_release(vdev->ud.tcp_socket);
 887                 vdev->ud.tcp_socket = NULL;
 888         }
 889         usbip_uinfo("release socket\n");
 890
 891         vhci_device_unlink_cleanup(vdev);
 892
 893         /*
 894          * rh_port_disconnect() is a trigger of ...
 895          *   usb_disable_device():
 896          *      disable all the endpoints for a USB device.
 897          *   usb_disable_endpoint():
 898          *      disable endpoints. pending urbs are unlinked(dequeued).
 899          *
 900          * NOTE: After calling rh_port_disconnect(), the USB device drivers of a
 901          * deteched device should release used urbs in a cleanup function(i.e.
 902          * xxx_disconnect()). Therefore, vhci_hcd does not need to release
 903          * pushed urbs and their private data in this function.
 904          *
 905          * NOTE: vhci_dequeue() must be considered carefully. When shutdowning
 906          * a connection, vhci_shutdown_connection() expects vhci_dequeue()
 907          * gives back pushed urbs and frees their private data by request of
 908          * the cleanup function of a USB driver. When unlinking a urb with an
 909          * active connection, vhci_dequeue() does not give back the urb which
 910          * is actually given back by vhci_rx after receiving its return pdu.
 911          *
 912          */
 913         rh_port_disconnect(vdev->rhport);
 914
 915         usbip_uinfo("disconnect device\n");
 916 }
 917
 918
 919 static void vhci_device_reset(struct usbip_device *ud)
 920 {
 921         struct vhci_device *vdev = container_of(ud, struct vhci_device, ud);
 922
 923         spin_lock(&ud->lock);
 924
 925         vdev->speed  = 0;
 926         vdev->devid  = 0;
 927
 928         if (vdev->udev)
 929                 usb_put_dev(vdev->udev);
 930         vdev->udev = NULL;
 931
 932         ud->tcp_socket = NULL;
 933
 934         ud->status = VDEV_ST_NULL;
 935
 936         spin_unlock(&ud->lock);
 937 }
 938
 939 static void vhci_device_unusable(struct usbip_device *ud)
 940 {
 941         spin_lock(&ud->lock);
 942
 943         ud->status = VDEV_ST_ERROR;
 944
 945         spin_unlock(&ud->lock);
 946 }
 947
 948 static void vhci_device_init(struct vhci_device *vdev)
 949 {
 950         memset(vdev, 0, sizeof(*vdev));
 951
 952         vdev->ud.tcp_rx = kthread_create(vhci_rx_loop, &vdev->ud, "vhci_rx");
 953         vdev->ud.tcp_tx = kthread_create(vhci_tx_loop, &vdev->ud, "vhci_tx");
 954
 955         vdev->ud.side   = USBIP_VHCI;
 956         vdev->ud.status = VDEV_ST_NULL;
 957         /* vdev->ud.lock   = SPIN_LOCK_UNLOCKED; */
 958         spin_lock_init(&vdev->ud.lock);
 959
 960         INIT_LIST_HEAD(&vdev->priv_rx);
 961         INIT_LIST_HEAD(&vdev->priv_tx);
 962         INIT_LIST_HEAD(&vdev->unlink_tx);
 963         INIT_LIST_HEAD(&vdev->unlink_rx);
 964         /* vdev->priv_lock = SPIN_LOCK_UNLOCKED; */
 965         spin_lock_init(&vdev->priv_lock);
 966
 967         init_waitqueue_head(&vdev->waitq_tx);
 968
 969         vdev->ud.eh_ops.shutdown = vhci_shutdown_connection;
 970         vdev->ud.eh_ops.reset = vhci_device_reset;
 971         vdev->ud.eh_ops.unusable = vhci_device_unusable;
 972
 973         usbip_start_eh(&vdev->ud);
 974 }
 975
 976
 977 /*----------------------------------------------------------------------*/
 978
 979 static int vhci_start(struct usb_hcd *hcd)
 980 {
 981         struct vhci_hcd *vhci = hcd_to_vhci(hcd);
 982         int rhport;
 983         int err = 0;
 984
 985         usbip_dbg_vhci_hc("enter vhci_start\n");
 986
 987
 988         /* initialize private data of usb_hcd */
 989
 990         for (rhport = 0; rhport < VHCI_NPORTS; rhport++) {
 991                 struct vhci_device *vdev = &vhci->vdev[rhport];
 992                 vhci_device_init(vdev);
 993                 vdev->rhport = rhport;
 994         }
 995
 996         atomic_set(&vhci->seqnum, 0);
 997         spin_lock_init(&vhci->lock);
 998
 999
1000
1001         hcd->power_budget = 0; /* no limit */
1002         hcd->state  = HC_STATE_RUNNING;
1003         hcd->uses_new_polling = 1;
1004
1005
1006         /* vhci_hcd is now ready to be controlled through sysfs */
1007         err = sysfs_create_group(&vhci_dev(vhci)->kobj, &dev_attr_group);
1008         if (err) {
1009                 usbip_uerr("create sysfs files\n");
1010                 return err;
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 rhport = 0;
1020
1021         usbip_dbg_vhci_hc("stop VHCI controller\n");
1022
1023
1024         /* 1. remove the userland interface of vhci_hcd */
1025         sysfs_remove_group(&vhci_dev(vhci)->kobj, &dev_attr_group);
1026
1027         /* 2. shutdown all the ports of vhci_hcd */
1028         for (rhport = 0 ; rhport < VHCI_NPORTS; rhport++) {
1029                 struct vhci_device *vdev = &vhci->vdev[rhport];
1030
1031                 usbip_event_add(&vdev->ud, VDEV_EVENT_REMOVED);
1032                 usbip_stop_eh(&vdev->ud);
1033         }
1034
1035
1036         usbip_uinfo("vhci_stop done\n");
1037 }
1038
1039 /*----------------------------------------------------------------------*/
1040
1041 static int vhci_get_frame_number(struct usb_hcd *hcd)
1042 {
1043         usbip_uerr("Not yet implemented\n");
1044         return 0;
1045 }
1046
1047
1048 #ifdef CONFIG_PM
1049
1050 /* FIXME: suspend/resume */
1051 static int vhci_bus_suspend(struct usb_hcd *hcd)
1052 {
1053         struct vhci_hcd *vhci = hcd_to_vhci(hcd);
1054
1055         dev_dbg(&hcd->self.root_hub->dev, "%s\n", __func__);
1056
1057         spin_lock_irq(&vhci->lock);
1058         /* vhci->rh_state = DUMMY_RH_SUSPENDED;
1059          * set_link_state(vhci); */
1060         hcd->state = HC_STATE_SUSPENDED;
1061         spin_unlock_irq(&vhci->lock);
1062
1063         return 0;
1064 }
1065
1066 static int vhci_bus_resume(struct usb_hcd *hcd)
1067 {
1068         struct vhci_hcd *vhci = hcd_to_vhci(hcd);
1069         int rc = 0;
1070
1071         dev_dbg(&hcd->self.root_hub->dev, "%s\n", __func__);
1072
1073         spin_lock_irq(&vhci->lock);
1074         if (!HCD_HW_ACCESSIBLE(hcd)) {
1075                 rc = -ESHUTDOWN;
1076         } else {
1077                 /* vhci->rh_state = DUMMY_RH_RUNNING;
1078                  * set_link_state(vhci);
1079                  * if (!list_empty(&vhci->urbp_list))
1080                  *      mod_timer(&vhci->timer, jiffies); */
1081                 hcd->state = HC_STATE_RUNNING;
1082         }
1083         spin_unlock_irq(&vhci->lock);
1084         return rc;
1085
1086         return 0;
1087 }
1088
1089 #else
1090
1091 #define vhci_bus_suspend      NULL
1092 #define vhci_bus_resume       NULL
1093 #endif
1094
1095
1096
1097 static struct hc_driver vhci_hc_driver = {
1098         .description    = driver_name,
1099         .product_desc   = driver_desc,
1100         .hcd_priv_size  = sizeof(struct vhci_hcd),
1101
1102         .flags          = HCD_USB2,
1103
1104         .start          = vhci_start,
1105         .stop           = vhci_stop,
1106
1107         .urb_enqueue    = vhci_urb_enqueue,
1108         .urb_dequeue    = vhci_urb_dequeue,
1109
1110         .get_frame_number = vhci_get_frame_number,
1111
1112         .hub_status_data = vhci_hub_status,
1113         .hub_control    = vhci_hub_control,
1114         .bus_suspend    = vhci_bus_suspend,
1115         .bus_resume     = vhci_bus_resume,
1116 };
1117
1118 static int vhci_hcd_probe(struct platform_device *pdev)
1119 {
1120         struct usb_hcd          *hcd;
1121         int                     ret;
1122
1123         usbip_uinfo("proving...\n");
1124
1125         usbip_dbg_vhci_hc("name %s id %d\n", pdev->name, pdev->id);
1126
1127         /* will be removed */
1128         if (pdev->dev.dma_mask) {
1129                 dev_info(&pdev->dev, "vhci_hcd DMA not supported\n");
1130                 return -EINVAL;
1131         }
1132
1133         /*
1134          * Allocate and initialize hcd.
1135          * Our private data is also allocated automatically.
1136          */
1137         hcd = usb_create_hcd(&vhci_hc_driver, &pdev->dev, dev_name(&pdev->dev));
1138         if (!hcd) {
1139                 usbip_uerr("create hcd failed\n");
1140                 return -ENOMEM;
1141         }
1142         hcd->has_tt = 1;
1143
1144         /* this is private data for vhci_hcd */
1145         the_controller = hcd_to_vhci(hcd);
1146
1147         /*
1148          * Finish generic HCD structure initialization and register.
1149          * Call the driver's reset() and start() routines.
1150          */
1151         ret = usb_add_hcd(hcd, 0, 0);
1152         if (ret != 0) {
1153                 usbip_uerr("usb_add_hcd failed %d\n", ret);
1154                 usb_put_hcd(hcd);
1155                 the_controller = NULL;
1156                 return ret;
1157         }
1158
1159
1160         usbip_dbg_vhci_hc("bye\n");
1161         return 0;
1162 }
1163
1164
1165 static int vhci_hcd_remove(struct platform_device *pdev)
1166 {
1167         struct usb_hcd  *hcd;
1168
1169         hcd = platform_get_drvdata(pdev);
1170         if (!hcd)
1171                 return 0;
1172
1173         /*
1174          * Disconnects the root hub,
1175          * then reverses the effects of usb_add_hcd(),
1176          * invoking the HCD's stop() methods.
1177          */
1178         usb_remove_hcd(hcd);
1179         usb_put_hcd(hcd);
1180         the_controller = NULL;
1181
1182
1183         return 0;
1184 }
1185
1186
1187
1188 #ifdef CONFIG_PM
1189
1190 /* what should happen for USB/IP under suspend/resume? */
1191 static int vhci_hcd_suspend(struct platform_device *pdev, pm_message_t state)
1192 {
1193         struct usb_hcd *hcd;
1194         int rhport = 0;
1195         int connected = 0;
1196         int ret = 0;
1197
1198         dev_dbg(&pdev->dev, "%s\n", __func__);
1199
1200         hcd = platform_get_drvdata(pdev);
1201
1202         spin_lock(&the_controller->lock);
1203
1204         for (rhport = 0; rhport < VHCI_NPORTS; rhport++)
1205                 if (the_controller->port_status[rhport] &
1206                                                 USB_PORT_STAT_CONNECTION)
1207                         connected += 1;
1208
1209         spin_unlock(&the_controller->lock);
1210
1211         if (connected > 0) {
1212                 usbip_uinfo("We have %d active connection%s. Do not suspend.\n",
1213                                 connected, (connected == 1 ? "" : "s"));
1214                 ret =  -EBUSY;
1215         } else {
1216                 usbip_uinfo("suspend vhci_hcd");
1217                 clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
1218         }
1219
1220         return ret;
1221 }
1222
1223 static int vhci_hcd_resume(struct platform_device *pdev)
1224 {
1225         struct usb_hcd *hcd;
1226
1227         dev_dbg(&pdev->dev, "%s\n", __func__);
1228
1229         hcd = platform_get_drvdata(pdev);
1230         set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
1231         usb_hcd_poll_rh_status(hcd);
1232
1233         return 0;
1234 }
1235
1236 #else
1237
1238 #define vhci_hcd_suspend        NULL
1239 #define vhci_hcd_resume         NULL
1240
1241 #endif
1242
1243
1244 static struct platform_driver vhci_driver = {
1245         .probe  = vhci_hcd_probe,
1246         .remove = __devexit_p(vhci_hcd_remove),
1247         .suspend = vhci_hcd_suspend,
1248         .resume = vhci_hcd_resume,
1249         .driver = {
1250                 .name = (char *) driver_name,
1251                 .owner = THIS_MODULE,
1252         },
1253 };
1254
1255 /*----------------------------------------------------------------------*/
1256
1257 /*
1258  * The VHCI 'device' is 'virtual'; not a real plug&play hardware.
1259  * We need to add this virtual device as a platform device arbitrarily:
1260  *      1. platform_device_register()
1261  */
1262 static void the_pdev_release(struct device *dev)
1263 {
1264         return;
1265 }
1266
1267 static struct platform_device the_pdev = {
1268         /* should be the same name as driver_name */
1269         .name = (char *) driver_name,
1270         .id = -1,
1271         .dev = {
1272                 /* .driver = &vhci_driver, */
1273                 .release = the_pdev_release,
1274         },
1275 };
1276
1277 static int __init vhci_init(void)
1278 {
1279         int ret;
1280
1281         usbip_dbg_vhci_hc("enter\n");
1282         if (usb_disabled())
1283                 return -ENODEV;
1284
1285         printk(KERN_INFO KBUILD_MODNAME ": %s, %s\n", driver_name,
1286                DRIVER_VERSION);
1287
1288         ret = platform_driver_register(&vhci_driver);
1289         if (ret < 0)
1290                 goto err_driver_register;
1291
1292         ret = platform_device_register(&the_pdev);
1293         if (ret < 0)
1294                 goto err_platform_device_register;
1295
1296         usbip_dbg_vhci_hc("bye\n");
1297         return ret;
1298
1299         /* error occurred */
1300 err_platform_device_register:
1301         platform_driver_unregister(&vhci_driver);
1302
1303 err_driver_register:
1304         usbip_dbg_vhci_hc("bye\n");
1305         return ret;
1306 }
1307 module_init(vhci_init);
1308
1309 static void __exit vhci_cleanup(void)
1310 {
1311         usbip_dbg_vhci_hc("enter\n");
1312
1313         platform_device_unregister(&the_pdev);
1314         platform_driver_unregister(&vhci_driver);
1315
1316         usbip_dbg_vhci_hc("bye\n");
1317 }
1318 module_exit(vhci_cleanup);