git.oblomov.eu Git - linux-2.6/blob - 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
  21 #include "usbip_common.h"
  22 #include "vhci.h"
  23
  24 #define DRIVER_VERSION "1.0"
  25 #define DRIVER_AUTHOR "Takahiro Hirofuchi"
  26 #define DRIVER_DESC "Virtual Host Controller Interface Driver for USB/IP"
  27 #define DRIVER_LICENCE "GPL"
  28 MODULE_AUTHOR(DRIVER_AUTHOR);
  29 MODULE_DESCRIPTION(DRIVER_DESC);
  30 MODULE_LICENSE(DRIVER_LICENCE);
  31
  32
  33
  34 /*
  35  * TODO
  36  *      - update root hub emulation
  37  *      - move the emulation code to userland ?
  38  *              porting to other operating systems
  39  *              minimize kernel code
  40  *      - add suspend/resume code
  41  *      - clean up everything
  42  */
  43
  44
  45 /* See usb gadget dummy hcd */
  46
  47
  48 static int vhci_hub_status(struct usb_hcd *hcd, char *buff);
  49 static int vhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
  50                 u16 wIndex, char *buff, u16 wLength);
  51 static int vhci_urb_enqueue(struct usb_hcd *hcd, struct urb *urb,
  52                                                         gfp_t mem_flags);
  53 static int vhci_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status);
  54 static int vhci_start(struct usb_hcd *vhci_hcd);
  55 static void vhci_stop(struct usb_hcd *hcd);
  56 static int vhci_get_frame_number(struct usb_hcd *hcd);
  57
  58 static const char driver_name[] = "vhci_hcd";
  59 static const char driver_desc[] = "USB/IP Virtual Host Contoroller";
  60
  61 struct vhci_hcd *the_controller;
  62
  63 static const char *bit_desc[] = {
  64         "CONNECTION",           /*0*/
  65         "ENABLE",               /*1*/
  66         "SUSPEND",              /*2*/
  67         "OVER_CURRENT",         /*3*/
  68         "RESET",                /*4*/
  69         "R5",           /*5*/
  70         "R6",           /*6*/
  71         "R7",           /*7*/
  72         "POWER",                /*8*/
  73         "LOWSPEED",             /*9*/
  74         "HIGHSPEED",            /*10*/
  75         "PORT_TEST",            /*11*/
  76         "INDICATOR",            /*12*/
  77         "R13",          /*13*/
  78         "R14",          /*14*/
  79         "R15",          /*15*/
  80         "C_CONNECTION",         /*16*/
  81         "C_ENABLE",             /*17*/
  82         "C_SUSPEND",            /*18*/
  83         "C_OVER_CURRENT",       /*19*/
  84         "C_RESET",              /*20*/
  85         "R21",          /*21*/
  86         "R22",          /*22*/
  87         "R23",          /*23*/
  88         "R24",          /*24*/
  89         "R25",          /*25*/
  90         "R26",          /*26*/
  91         "R27",          /*27*/
  92         "R28",          /*28*/
  93         "R29",          /*29*/
  94         "R30",          /*30*/
  95         "R31",          /*31*/
  96 };
  97
  98
  99 static void dump_port_status(u32 status)
 100 {
 101         int i = 0;
 102
 103         printk(KERN_DEBUG "status %08x:", status);
 104         for (i = 0; i < 32; i++) {
 105                 if (status & (1 << i))
 106                         printk(" %s", bit_desc[i]);
 107         }
 108
 109         printk("\n");
 110 }
 111
 112
 113
 114 void rh_port_connect(int rhport, enum usb_device_speed speed)
 115 {
 116         unsigned long   flags;
 117
 118         dbg_vhci_rh("rh_port_connect %d\n", rhport);
 119
 120         spin_lock_irqsave(&the_controller->lock, flags);
 121
 122         the_controller->port_status[rhport] |= USB_PORT_STAT_CONNECTION
 123                 | (1 << USB_PORT_FEAT_C_CONNECTION);
 124
 125         switch (speed) {
 126         case USB_SPEED_HIGH:
 127                 the_controller->port_status[rhport] |= USB_PORT_STAT_HIGH_SPEED;
 128                 break;
 129         case USB_SPEED_LOW:
 130                 the_controller->port_status[rhport] |= USB_PORT_STAT_LOW_SPEED;
 131                 break;
 132         default:
 133                 break;
 134         }
 135
 136         /* spin_lock(&the_controller->vdev[rhport].ud.lock);
 137          * the_controller->vdev[rhport].ud.status = VDEV_CONNECT;
 138          * spin_unlock(&the_controller->vdev[rhport].ud.lock); */
 139
 140         the_controller->pending_port = rhport;
 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         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
 168
 169
 170 /*----------------------------------------------------------------------*/
 171
 172 #define PORT_C_MASK \
 173         ((USB_PORT_STAT_C_CONNECTION \
 174           | USB_PORT_STAT_C_ENABLE \
 175           | USB_PORT_STAT_C_SUSPEND \
 176           | USB_PORT_STAT_C_OVERCURRENT \
 177           | USB_PORT_STAT_C_RESET) << 16)
 178
 179 /*
 180  * This function is almostly the same as dummy_hcd.c:dummy_hub_status() without
 181  * suspend/resume support. But, it is modified to provide multiple ports.
 182  *
 183  * @buf: a bitmap to show which port status has been changed.
 184  *  bit  0: reserved or used for another purpose?
 185  *  bit  1: the status of port 0 has been changed.
 186  *  bit  2: the status of port 1 has been changed.
 187  *  ...
 188  *  bit  7: the status of port 6 has been changed.
 189  *  bit  8: the status of port 7 has been changed.
 190  *  ...
 191  *  bit 15: the status of port 14 has been changed.
 192  *
 193  * So, the maximum number of ports is 31 ( port 0 to port 30) ?
 194  *
 195  * The return value is the actual transfered length in byte. If nothing has
 196  * been changed, return 0. In the case that the number of ports is less than or
 197  * equal to 6 (VHCI_NPORTS==7), return 1.
 198  *
 199  */
 200 static int vhci_hub_status(struct usb_hcd *hcd, char *buf)
 201 {
 202         struct vhci_hcd *vhci;
 203         unsigned long   flags;
 204         int             retval = 0;
 205
 206         /* the enough buffer is allocated according to USB_MAXCHILDREN */
 207         unsigned long   *event_bits = (unsigned long *) buf;
 208         int             rhport;
 209         int             changed = 0;
 210
 211
 212         *event_bits = 0;
 213
 214         vhci = hcd_to_vhci(hcd);
 215
 216         spin_lock_irqsave(&vhci->lock, flags);
 217         if (!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags)) {
 218                 dbg_vhci_rh("hw accessible flag in on?\n");
 219                 goto done;
 220         }
 221
 222         /* check pseudo status register for each port */
 223         for (rhport = 0; rhport < VHCI_NPORTS; rhport++) {
 224                 if ((vhci->port_status[rhport] & PORT_C_MASK)) {
 225                         /* The status of a port has been changed, */
 226                         dbg_vhci_rh("port %d is changed\n", rhport);
 227
 228                         *event_bits |= 1 << (rhport + 1);
 229                         changed = 1;
 230                 }
 231         }
 232
 233         uinfo("changed %d\n", changed);
 234
 235         if (hcd->state == HC_STATE_SUSPENDED)
 236                 usb_hcd_resume_root_hub(hcd);
 237
 238         if (changed)
 239                 retval = 1 + (VHCI_NPORTS / 8);
 240         else
 241                 retval = 0;
 242
 243 done:
 244         spin_unlock_irqrestore(&vhci->lock, flags);
 245         return retval;
 246 }
 247
 248 /* See hub_configure in hub.c */
 249 static inline void hub_descriptor(struct usb_hub_descriptor *desc)
 250 {
 251         memset(desc, 0, sizeof(*desc));
 252         desc->bDescriptorType = 0x29;
 253         desc->bDescLength = 9;
 254         desc->wHubCharacteristics = (__force __u16)
 255                 (__constant_cpu_to_le16(0x0001));
 256         desc->bNbrPorts = VHCI_NPORTS;
 257         desc->bitmap[0] = 0xff;
 258         desc->bitmap[1] = 0xff;
 259 }
 260
 261 static int vhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
 262                             u16 wIndex, char *buf, u16 wLength)
 263 {
 264         struct vhci_hcd *dum;
 265         int             retval = 0;
 266         unsigned long   flags;
 267         int             rhport;
 268
 269         u32 prev_port_status[VHCI_NPORTS];
 270
 271         if (!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags))
 272                 return -ETIMEDOUT;
 273
 274         /*
 275          * NOTE:
 276          * wIndex shows the port number and begins from 1.
 277          */
 278         dbg_vhci_rh("typeReq %x wValue %x wIndex %x\n", typeReq, wValue,
 279                                                                 wIndex);
 280         if (wIndex > VHCI_NPORTS)
 281                 printk(KERN_ERR "%s: invalid port number %d\n", __func__, wIndex);
 282         rhport = ((__u8)(wIndex & 0x00ff)) - 1;
 283
 284         dum = hcd_to_vhci(hcd);
 285
 286         spin_lock_irqsave(&dum->lock, flags);
 287
 288         /* store old status and compare now and old later */
 289         if (dbg_flag_vhci_rh) {
 290                 int i = 0;
 291                 for (i = 0; i < VHCI_NPORTS; i++)
 292                         prev_port_status[i] = dum->port_status[i];
 293         }
 294
 295         switch (typeReq) {
 296         case ClearHubFeature:
 297                 dbg_vhci_rh(" ClearHubFeature\n");
 298                 break;
 299         case ClearPortFeature:
 300                 switch (wValue) {
 301                 case USB_PORT_FEAT_SUSPEND:
 302                         if (dum->port_status[rhport] & USB_PORT_STAT_SUSPEND) {
 303                                 /* 20msec signaling */
 304                                 dum->resuming = 1;
 305                                 dum->re_timeout =
 306                                         jiffies + msecs_to_jiffies(20);
 307                         }
 308                         break;
 309                 case USB_PORT_FEAT_POWER:
 310                         dbg_vhci_rh(" ClearPortFeature: USB_PORT_FEAT_POWER\n");
 311                         dum->port_status[rhport] = 0;
 312                         /* dum->address = 0; */
 313                         /* dum->hdev = 0; */
 314                         dum->resuming = 0;
 315                         break;
 316                 case USB_PORT_FEAT_C_RESET:
 317                         dbg_vhci_rh(" ClearPortFeature: "
 318                                         "USB_PORT_FEAT_C_RESET\n");
 319                         switch (dum->vdev[rhport].speed) {
 320                         case USB_SPEED_HIGH:
 321                                 dum->port_status[rhport] |=
 322                                                 USB_PORT_STAT_HIGH_SPEED;
 323                                 break;
 324                         case USB_SPEED_LOW:
 325                                 dum->port_status[rhport] |=
 326                                                 USB_PORT_STAT_LOW_SPEED;
 327                                 break;
 328                         default:
 329                                 break;
 330                         }
 331                 default:
 332                         dbg_vhci_rh(" ClearPortFeature: default %x\n", wValue);
 333                         dum->port_status[rhport] &= ~(1 << wValue);
 334                 }
 335                 break;
 336         case GetHubDescriptor:
 337                 dbg_vhci_rh(" GetHubDescriptor\n");
 338                 hub_descriptor((struct usb_hub_descriptor *) buf);
 339                 break;
 340         case GetHubStatus:
 341                 dbg_vhci_rh(" GetHubStatus\n");
 342                 *(__le32 *) buf = __constant_cpu_to_le32(0);
 343                 break;
 344         case GetPortStatus:
 345                 dbg_vhci_rh(" GetPortStatus port %x\n", wIndex);
 346                 if (wIndex > VHCI_NPORTS || wIndex < 1) {
 347                         printk(KERN_ERR "%s: invalid port number %d\n",
 348                                __func__, wIndex);
 349                         retval = -EPIPE;
 350                 }
 351
 352                 /* we do no care of resume. */
 353
 354                 /* whoever resets or resumes must GetPortStatus to
 355                  * complete it!!
 356                  *                                   */
 357                 if (dum->resuming && time_after(jiffies, dum->re_timeout)) {
 358                         printk(KERN_ERR "%s: not yet\n", __func__);
 359                         dum->port_status[rhport] |=
 360                                         (1 << USB_PORT_FEAT_C_SUSPEND);
 361                         dum->port_status[rhport] &=
 362                                         ~(1 << USB_PORT_FEAT_SUSPEND);
 363                         dum->resuming = 0;
 364                         dum->re_timeout = 0;
 365                         /* if (dum->driver && dum->driver->resume) {
 366                          *      spin_unlock (&dum->lock);
 367                          *      dum->driver->resume (&dum->gadget);
 368                          *      spin_lock (&dum->lock);
 369                          * } */
 370                 }
 371
 372                 if ((dum->port_status[rhport] & (1 << USB_PORT_FEAT_RESET)) !=
 373                                 0 && time_after(jiffies, dum->re_timeout)) {
 374                         dum->port_status[rhport] |=
 375                                                 (1 << USB_PORT_FEAT_C_RESET);
 376                         dum->port_status[rhport] &=
 377                                                 ~(1 << USB_PORT_FEAT_RESET);
 378                         dum->re_timeout = 0;
 379
 380                         if (dum->vdev[rhport].ud.status ==
 381                                                         VDEV_ST_NOTASSIGNED) {
 382                                 dbg_vhci_rh(" enable rhport %d (status %u)\n",
 383                                                 rhport,
 384                                                 dum->vdev[rhport].ud.status);
 385                                 dum->port_status[rhport] |=
 386                                                         USB_PORT_STAT_ENABLE;
 387                         }
 388 #if 0
 389                         if (dum->driver) {
 390
 391                                 dum->port_status[rhport] |=
 392                                                         USB_PORT_STAT_ENABLE;
 393                                 /* give it the best speed we agree on */
 394                                 dum->gadget.speed = dum->driver->speed;
 395                                 dum->gadget.ep0->maxpacket = 64;
 396                                 switch (dum->gadget.speed) {
 397                                 case USB_SPEED_HIGH:
 398                                         dum->port_status[rhport] |=
 399                                         USB_PORT_STAT_HIGH_SPEED;
 400                                         break;
 401                                 case USB_SPEED_LOW:
 402                                         dum->gadget.ep0->maxpacket = 8;
 403                                         dum->port_status[rhport] |=
 404                                         USB_PORT_STAT_LOW_SPEED;
 405                                         break;
 406                                 default:
 407                                         dum->gadget.speed = USB_SPEED_FULL;
 408                                         break;
 409                                 }
 410                         }
 411 #endif
 412
 413                 }
 414                 ((u16 *) buf)[0] = cpu_to_le16(dum->port_status[rhport]);
 415                 ((u16 *) buf)[1] =
 416                                 cpu_to_le16(dum->port_status[rhport] >> 16);
 417
 418                 dbg_vhci_rh(" GetPortStatus bye %x %x\n", ((u16 *)buf)[0],
 419                                                         ((u16 *)buf)[1]);
 420                 break;
 421         case SetHubFeature:
 422                 dbg_vhci_rh(" SetHubFeature\n");
 423                 retval = -EPIPE;
 424                 break;
 425         case SetPortFeature:
 426                 switch (wValue) {
 427                 case USB_PORT_FEAT_SUSPEND:
 428                         dbg_vhci_rh(" SetPortFeature: "
 429                                         "USB_PORT_FEAT_SUSPEND\n");
 430                         printk(KERN_ERR "%s: not yet\n", __func__);
 431 #if 0
 432                         dum->port_status[rhport] |=
 433                                                 (1 << USB_PORT_FEAT_SUSPEND);
 434                         if (dum->driver->suspend) {
 435                                 spin_unlock(&dum->lock);
 436                                 dum->driver->suspend(&dum->gadget);
 437                                 spin_lock(&dum->lock);
 438                         }
 439 #endif
 440                         break;
 441                 case USB_PORT_FEAT_RESET:
 442                         dbg_vhci_rh(" SetPortFeature: USB_PORT_FEAT_RESET\n");
 443                         /* if it's already running, disconnect first */
 444                         if (dum->port_status[rhport] & USB_PORT_STAT_ENABLE) {
 445                                 dum->port_status[rhport] &=
 446                                                 ~(USB_PORT_STAT_ENABLE |
 447                                                   USB_PORT_STAT_LOW_SPEED |
 448                                                   USB_PORT_STAT_HIGH_SPEED);
 449 #if 0
 450                                 if (dum->driver) {
 451                                         dev_dbg(hardware, "disconnect\n");
 452                                         stop_activity(dum, dum->driver);
 453                                 }
 454 #endif
 455
 456                                 /* FIXME test that code path! */
 457                         }
 458                         /* 50msec reset signaling */
 459                         dum->re_timeout = jiffies + msecs_to_jiffies(50);
 460
 461                         /* FALLTHROUGH */
 462                 default:
 463                         dbg_vhci_rh(" SetPortFeature: default %d\n", wValue);
 464                         dum->port_status[rhport] |= (1 << wValue);
 465                 }
 466                 break;
 467
 468         default:
 469                 printk(KERN_ERR "%s: default: no such request\n", __func__);
 470                 /* dev_dbg (hardware,
 471                  *              "hub control req%04x v%04x i%04x l%d\n",
 472                  *              typeReq, wValue, wIndex, wLength); */
 473
 474                 /* "protocol stall" on error */
 475                 retval = -EPIPE;
 476         }
 477
 478         if (dbg_flag_vhci_rh) {
 479                 printk(KERN_DEBUG "port %d\n", rhport);
 480                 dump_port_status(prev_port_status[rhport]);
 481                 dump_port_status(dum->port_status[rhport]);
 482         }
 483         dbg_vhci_rh(" bye\n");
 484
 485         spin_unlock_irqrestore(&dum->lock, flags);
 486
 487         return retval;
 488 }
 489
 490
 491
 492 /*----------------------------------------------------------------------*/
 493
 494 static struct vhci_device *get_vdev(struct usb_device *udev)
 495 {
 496         int i;
 497
 498         if (!udev)
 499                 return NULL;
 500
 501         for (i = 0; i < VHCI_NPORTS; i++)
 502                 if (the_controller->vdev[i].udev == udev)
 503                         return port_to_vdev(i);
 504
 505         return NULL;
 506 }
 507
 508 static void vhci_tx_urb(struct urb *urb)
 509 {
 510         struct vhci_device *vdev = get_vdev(urb->dev);
 511         struct vhci_priv *priv;
 512         unsigned long flag;
 513
 514         if (!vdev) {
 515                 err("could not get virtual device");
 516                 /* BUG(); */
 517                 return;
 518         }
 519
 520         spin_lock_irqsave(&vdev->priv_lock, flag);
 521
 522         priv = kzalloc(sizeof(struct vhci_priv), GFP_ATOMIC);
 523         if (!priv) {
 524                 dev_err(&urb->dev->dev, "malloc vhci_priv\n");
 525                 spin_unlock_irqrestore(&vdev->priv_lock, flag);
 526                 usbip_event_add(&vdev->ud, VDEV_EVENT_ERROR_MALLOC);
 527                 return;
 528         }
 529
 530         priv->seqnum = atomic_inc_return(&the_controller->seqnum);
 531         if (priv->seqnum == 0xffff)
 532                 uinfo("seqnum max\n");
 533
 534         priv->vdev = vdev;
 535         priv->urb = urb;
 536
 537         urb->hcpriv = (void *) priv;
 538
 539
 540         list_add_tail(&priv->list, &vdev->priv_tx);
 541
 542         wake_up(&vdev->waitq_tx);
 543         spin_unlock_irqrestore(&vdev->priv_lock, flag);
 544 }
 545
 546 static int vhci_urb_enqueue(struct usb_hcd *hcd, struct urb *urb,
 547                             gfp_t mem_flags)
 548 {
 549         struct device *dev = &urb->dev->dev;
 550         int ret = 0;
 551         unsigned long flags;
 552
 553         dbg_vhci_hc("enter, usb_hcd %p urb %p mem_flags %d\n",
 554                     hcd, urb, mem_flags);
 555
 556         /* patch to usb_sg_init() is in 2.5.60 */
 557         BUG_ON(!urb->transfer_buffer && urb->transfer_buffer_length);
 558
 559         spin_lock_irqsave(&the_controller->lock, flags);
 560
 561         /* check HC is active or not */
 562         if (!HC_IS_RUNNING(hcd->state)) {
 563                 dev_err(dev, "HC is not running\n");
 564                 spin_unlock_irqrestore(&the_controller->lock, flags);
 565                 return -ENODEV;
 566         }
 567
 568         if (urb->status != -EINPROGRESS) {
 569                 dev_err(dev, "URB already unlinked!, status %d\n", urb->status);
 570                 spin_unlock_irqrestore(&the_controller->lock, flags);
 571                 return urb->status;
 572         }
 573
 574         ret = usb_hcd_link_urb_to_ep(hcd, urb);
 575         if (ret)
 576                 goto no_need_unlink;
 577
 578         /*
 579          * The enumelation process is as follows;
 580          *
 581          *  1. Get_Descriptor request to DevAddrs(0) EndPoint(0)
 582          *     to get max packet length of default pipe
 583          *
 584          *  2. Set_Address request to DevAddr(0) EndPoint(0)
 585          *
 586          */
 587
 588         if (usb_pipedevice(urb->pipe) == 0) {
 589                 __u8 type = usb_pipetype(urb->pipe);
 590                 struct usb_ctrlrequest *ctrlreq =
 591                                 (struct usb_ctrlrequest *) urb->setup_packet;
 592                 struct vhci_device *vdev =
 593                                 port_to_vdev(the_controller->pending_port);
 594
 595                 if (type != PIPE_CONTROL || !ctrlreq) {
 596                         dev_err(dev, "invalid request to devnum 0\n");
 597                         ret = EINVAL;
 598                         goto no_need_xmit;
 599                 }
 600
 601                 switch (ctrlreq->bRequest) {
 602                 case USB_REQ_SET_ADDRESS:
 603                         /* set_address may come when a device is reset */
 604                         dev_info(dev, "SetAddress Request (%d) to port %d\n",
 605                                  ctrlreq->wValue, vdev->rhport);
 606
 607                         vdev->udev = urb->dev;
 608
 609                         spin_lock(&vdev->ud.lock);
 610                         vdev->ud.status = VDEV_ST_USED;
 611                         spin_unlock(&vdev->ud.lock);
 612
 613                         if (urb->status == -EINPROGRESS) {
 614                                 /* This request is successfully completed. */
 615                                 /* If not -EINPROGRESS, possibly unlinked. */
 616                                 urb->status = 0;
 617                         }
 618
 619                         goto no_need_xmit;
 620
 621                 case USB_REQ_GET_DESCRIPTOR:
 622                         if (ctrlreq->wValue == (USB_DT_DEVICE << 8))
 623                                 dbg_vhci_hc("Not yet?: "
 624                                                 "Get_Descriptor to device 0 "
 625                                                 "(get max pipe size)\n");
 626
 627                         /* FIXME: reference count? (usb_get_dev()) */
 628                         vdev->udev = urb->dev;
 629                         goto out;
 630
 631                 default:
 632                         /* NOT REACHED */
 633                         dev_err(dev, "invalid request to devnum 0 bRequest %u, "
 634                                 "wValue %u\n", ctrlreq->bRequest,
 635                                 ctrlreq->wValue);
 636                         ret =  -EINVAL;
 637                         goto no_need_xmit;
 638                 }
 639
 640         }
 641
 642 out:
 643         vhci_tx_urb(urb);
 644
 645         spin_unlock_irqrestore(&the_controller->lock, flags);
 646
 647         return 0;
 648
 649 no_need_xmit:
 650         usb_hcd_unlink_urb_from_ep(hcd, urb);
 651 no_need_unlink:
 652         spin_unlock_irqrestore(&the_controller->lock, flags);
 653
 654         usb_hcd_giveback_urb(vhci_to_hcd(the_controller), urb, urb->status);
 655
 656         return 0;
 657 }
 658
 659 /*
 660  * vhci_rx gives back the urb after receiving the reply of the urb.  If an
 661  * unlink pdu is sent or not, vhci_rx receives a normal return pdu and gives
 662  * back its urb. For the driver unlinking the urb, the content of the urb is
 663  * not important, but the calling to its completion handler is important; the
 664  * completion of unlinking is notified by the completion handler.
 665  *
 666  *
 667  * CLIENT SIDE
 668  *
 669  * - When vhci_hcd receives RET_SUBMIT,
 670  *
 671  *      - case 1a). the urb of the pdu is not unlinking.
 672  *              - normal case
 673  *              => just give back the urb
 674  *
 675  *      - case 1b). the urb of the pdu is unlinking.
 676  *              - usbip.ko will return a reply of the unlinking request.
 677  *              => give back the urb now and go to case 2b).
 678  *
 679  * - When vhci_hcd receives RET_UNLINK,
 680  *
 681  *      - case 2a). a submit request is still pending in vhci_hcd.
 682  *              - urb was really pending in usbip.ko and urb_unlink_urb() was
 683  *                completed there.
 684  *              => free a pending submit request
 685  *              => notify unlink completeness by giving back the urb
 686  *
 687  *      - case 2b). a submit request is *not* pending in vhci_hcd.
 688  *              - urb was already given back to the core driver.
 689  *              => do not give back the urb
 690  *
 691  *
 692  * SERVER SIDE
 693  *
 694  * - When usbip receives CMD_UNLINK,
 695  *
 696  *      - case 3a). the urb of the unlink request is now in submission.
 697  *              => do usb_unlink_urb().
 698  *              => after the unlink is completed, send RET_UNLINK.
 699  *
 700  *      - case 3b). the urb of the unlink request is not in submission.
 701  *              - may be already completed or never be received
 702  *              => send RET_UNLINK
 703  *
 704  */
 705 static int vhci_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
 706 {
 707         unsigned long flags;
 708         struct vhci_priv *priv;
 709         struct vhci_device *vdev;
 710
 711         uinfo("vhci_hcd: dequeue a urb %p\n", urb);
 712
 713
 714         spin_lock_irqsave(&the_controller->lock, flags);
 715
 716         priv = urb->hcpriv;
 717         if (!priv) {
 718                 /* URB was never linked! or will be soon given back by
 719                  * vhci_rx. */
 720                 spin_unlock_irqrestore(&the_controller->lock, flags);
 721                 return 0;
 722         }
 723
 724         {
 725                 int ret = 0;
 726                 ret = usb_hcd_check_unlink_urb(hcd, urb, status);
 727                 if (ret) {
 728                         spin_unlock_irqrestore(&the_controller->lock, flags);
 729                         return 0;
 730                 }
 731         }
 732
 733          /* send unlink request here? */
 734         vdev = priv->vdev;
 735
 736         if (!vdev->ud.tcp_socket) {
 737                 /* tcp connection is closed */
 738                 unsigned long flags2;
 739
 740                 spin_lock_irqsave(&vdev->priv_lock, flags2);
 741
 742                 uinfo("vhci_hcd: device %p seems to be disconnected\n", vdev);
 743                 list_del(&priv->list);
 744                 kfree(priv);
 745                 urb->hcpriv = NULL;
 746
 747                 spin_unlock_irqrestore(&vdev->priv_lock, flags2);
 748
 749         } else {
 750                 /* tcp connection is alive */
 751                 unsigned long flags2;
 752                 struct vhci_unlink *unlink;
 753
 754                 spin_lock_irqsave(&vdev->priv_lock, flags2);
 755
 756                 /* setup CMD_UNLINK pdu */
 757                 unlink = kzalloc(sizeof(struct vhci_unlink), GFP_ATOMIC);
 758                 if (!unlink) {
 759                         uerr("malloc vhci_unlink\n");
 760                         spin_unlock_irqrestore(&vdev->priv_lock, flags2);
 761                         spin_unlock_irqrestore(&the_controller->lock, flags);
 762                         usbip_event_add(&vdev->ud, VDEV_EVENT_ERROR_MALLOC);
 763                         return -ENOMEM;
 764                 }
 765
 766                 unlink->seqnum = atomic_inc_return(&the_controller->seqnum);
 767                 if (unlink->seqnum == 0xffff)
 768                         uinfo("seqnum max\n");
 769
 770                 unlink->unlink_seqnum = priv->seqnum;
 771
 772                 uinfo("vhci_hcd: device %p seems to be still connected\n",
 773                                                                         vdev);
 774
 775                 /* send cmd_unlink and try to cancel the pending URB in the
 776                  * peer */
 777                 list_add_tail(&unlink->list, &vdev->unlink_tx);
 778                 wake_up(&vdev->waitq_tx);
 779
 780                 spin_unlock_irqrestore(&vdev->priv_lock, flags2);
 781         }
 782
 783
 784         /*
 785          * If tcp connection is alive, we have sent CMD_UNLINK.
 786          * vhci_rx will receive RET_UNLINK and give back the URB.
 787          * Otherwise, we give back it here.
 788          */
 789         if (!vdev->ud.tcp_socket) {
 790                 /* tcp connection is closed */
 791                 uinfo("vhci_hcd: vhci_urb_dequeue() gives back urb %p\n", urb);
 792
 793                 usb_hcd_unlink_urb_from_ep(hcd, urb);
 794
 795                 spin_unlock_irqrestore(&the_controller->lock, flags);
 796                 usb_hcd_giveback_urb(vhci_to_hcd(the_controller), urb,
 797                                                                 urb->status);
 798                 spin_lock_irqsave(&the_controller->lock, flags);
 799         }
 800
 801         spin_unlock_irqrestore(&the_controller->lock, flags);
 802
 803         dbg_vhci_hc("leave\n");
 804         return 0;
 805 }
 806
 807
 808 static void vhci_device_unlink_cleanup(struct vhci_device *vdev)
 809 {
 810         struct vhci_unlink *unlink, *tmp;
 811
 812         spin_lock(&vdev->priv_lock);
 813
 814         list_for_each_entry_safe(unlink, tmp, &vdev->unlink_tx, list) {
 815                 list_del(&unlink->list);
 816                 kfree(unlink);
 817         }
 818
 819         list_for_each_entry_safe(unlink, tmp, &vdev->unlink_rx, list) {
 820                 list_del(&unlink->list);
 821                 kfree(unlink);
 822         }
 823
 824         spin_unlock(&vdev->priv_lock);
 825 }
 826
 827 /*
 828  * The important thing is that only one context begins cleanup.
 829  * This is why error handling and cleanup become simple.
 830  * We do not want to consider race condition as possible.
 831  */
 832 static void vhci_shutdown_connection(struct usbip_device *ud)
 833 {
 834         struct vhci_device *vdev = container_of(ud, struct vhci_device, ud);
 835
 836         /* need this? see stub_dev.c */
 837         if (ud->tcp_socket) {
 838                 udbg("shutdown tcp_socket %p\n", ud->tcp_socket);
 839                 kernel_sock_shutdown(ud->tcp_socket, SHUT_RDWR);
 840         }
 841
 842         usbip_stop_threads(&vdev->ud);
 843         uinfo("stop threads\n");
 844
 845         /* active connection is closed */
 846         if (vdev->ud.tcp_socket != NULL) {
 847                 sock_release(vdev->ud.tcp_socket);
 848                 vdev->ud.tcp_socket = NULL;
 849         }
 850         uinfo("release socket\n");
 851
 852         vhci_device_unlink_cleanup(vdev);
 853
 854         /*
 855          * rh_port_disconnect() is a trigger of ...
 856          *   usb_disable_device():
 857          *      disable all the endpoints for a USB device.
 858          *   usb_disable_endpoint():
 859          *      disable endpoints. pending urbs are unlinked(dequeued).
 860          *
 861          * NOTE: After calling rh_port_disconnect(), the USB device drivers of a
 862          * deteched device should release used urbs in a cleanup function(i.e.
 863          * xxx_disconnect()). Therefore, vhci_hcd does not need to release
 864          * pushed urbs and their private data in this function.
 865          *
 866          * NOTE: vhci_dequeue() must be considered carefully. When shutdowning
 867          * a connection, vhci_shutdown_connection() expects vhci_dequeue()
 868          * gives back pushed urbs and frees their private data by request of
 869          * the cleanup function of a USB driver. When unlinking a urb with an
 870          * active connection, vhci_dequeue() does not give back the urb which
 871          * is actually given back by vhci_rx after receiving its return pdu.
 872          *
 873          */
 874         rh_port_disconnect(vdev->rhport);
 875
 876         uinfo("disconnect device\n");
 877 }
 878
 879
 880 static void vhci_device_reset(struct usbip_device *ud)
 881 {
 882         struct vhci_device *vdev = container_of(ud, struct vhci_device, ud);
 883
 884         spin_lock(&ud->lock);
 885
 886         vdev->speed  = 0;
 887         vdev->devid  = 0;
 888
 889         ud->tcp_socket = NULL;
 890
 891         ud->status = VDEV_ST_NULL;
 892
 893         spin_unlock(&ud->lock);
 894 }
 895
 896 static void vhci_device_unusable(struct usbip_device *ud)
 897 {
 898         spin_lock(&ud->lock);
 899
 900         ud->status = VDEV_ST_ERROR;
 901
 902         spin_unlock(&ud->lock);
 903 }
 904
 905 static void vhci_device_init(struct vhci_device *vdev)
 906 {
 907         memset(vdev, 0, sizeof(*vdev));
 908
 909         usbip_task_init(&vdev->ud.tcp_rx, "vhci_rx", vhci_rx_loop);
 910         usbip_task_init(&vdev->ud.tcp_tx, "vhci_tx", vhci_tx_loop);
 911
 912         vdev->ud.side   = USBIP_VHCI;
 913         vdev->ud.status = VDEV_ST_NULL;
 914         /* vdev->ud.lock   = SPIN_LOCK_UNLOCKED; */
 915         spin_lock_init(&vdev->ud.lock);
 916
 917         INIT_LIST_HEAD(&vdev->priv_rx);
 918         INIT_LIST_HEAD(&vdev->priv_tx);
 919         INIT_LIST_HEAD(&vdev->unlink_tx);
 920         INIT_LIST_HEAD(&vdev->unlink_rx);
 921         /* vdev->priv_lock = SPIN_LOCK_UNLOCKED; */
 922         spin_lock_init(&vdev->priv_lock);
 923
 924         init_waitqueue_head(&vdev->waitq_tx);
 925
 926         vdev->ud.eh_ops.shutdown = vhci_shutdown_connection;
 927         vdev->ud.eh_ops.reset = vhci_device_reset;
 928         vdev->ud.eh_ops.unusable = vhci_device_unusable;
 929
 930         usbip_start_eh(&vdev->ud);
 931 }
 932
 933
 934 /*----------------------------------------------------------------------*/
 935
 936 static int vhci_start(struct usb_hcd *hcd)
 937 {
 938         struct vhci_hcd *vhci = hcd_to_vhci(hcd);
 939         int rhport;
 940         int err = 0;
 941
 942         dbg_vhci_hc("enter vhci_start\n");
 943
 944
 945         /* initialize private data of usb_hcd */
 946
 947         for (rhport = 0; rhport < VHCI_NPORTS; rhport++) {
 948                 struct vhci_device *vdev = &vhci->vdev[rhport];
 949                 vhci_device_init(vdev);
 950                 vdev->rhport = rhport;
 951         }
 952
 953         atomic_set(&vhci->seqnum, 0);
 954         spin_lock_init(&vhci->lock);
 955
 956
 957
 958         hcd->power_budget = 0; /* no limit */
 959         hcd->state  = HC_STATE_RUNNING;
 960         hcd->uses_new_polling = 1;
 961
 962
 963         /* vhci_hcd is now ready to be controlled through sysfs */
 964         err = sysfs_create_group(&vhci_dev(vhci)->kobj, &dev_attr_group);
 965         if (err) {
 966                 uerr("create sysfs files\n");
 967                 return err;
 968         }
 969
 970         return 0;
 971 }
 972
 973 static void vhci_stop(struct usb_hcd *hcd)
 974 {
 975         struct vhci_hcd *vhci = hcd_to_vhci(hcd);
 976         int rhport = 0;
 977
 978         dbg_vhci_hc("stop VHCI controller\n");
 979
 980
 981         /* 1. remove the userland interface of vhci_hcd */
 982         sysfs_remove_group(&vhci_dev(vhci)->kobj, &dev_attr_group);
 983
 984         /* 2. shutdown all the ports of vhci_hcd */
 985         for (rhport = 0 ; rhport < VHCI_NPORTS; rhport++) {
 986                 struct vhci_device *vdev = &vhci->vdev[rhport];
 987
 988                 usbip_event_add(&vdev->ud, VDEV_EVENT_REMOVED);
 989                 usbip_stop_eh(&vdev->ud);
 990         }
 991
 992
 993         uinfo("vhci_stop done\n");
 994 }
 995
 996 /*----------------------------------------------------------------------*/
 997
 998 static int vhci_get_frame_number(struct usb_hcd *hcd)
 999 {
1000         uerr("Not yet implemented\n");
1001         return 0;
1002 }
1003
1004
1005 #ifdef CONFIG_PM
1006
1007 /* FIXME: suspend/resume */
1008 static int vhci_bus_suspend(struct usb_hcd *hcd)
1009 {
1010         struct vhci_hcd *vhci = hcd_to_vhci(hcd);
1011
1012         dev_dbg(&hcd->self.root_hub->dev, "%s\n", __func__);
1013
1014         spin_lock_irq(&vhci->lock);
1015         /* vhci->rh_state = DUMMY_RH_SUSPENDED;
1016          * set_link_state(vhci); */
1017         hcd->state = HC_STATE_SUSPENDED;
1018         spin_unlock_irq(&vhci->lock);
1019
1020         return 0;
1021 }
1022
1023 static int vhci_bus_resume(struct usb_hcd *hcd)
1024 {
1025         struct vhci_hcd *vhci = hcd_to_vhci(hcd);
1026         int rc = 0;
1027
1028         dev_dbg(&hcd->self.root_hub->dev, "%s\n", __func__);
1029
1030         spin_lock_irq(&vhci->lock);
1031         if (!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags)) {
1032                 rc = -ESHUTDOWN;
1033         } else {
1034                 /* vhci->rh_state = DUMMY_RH_RUNNING;
1035                  * set_link_state(vhci);
1036                  * if (!list_empty(&vhci->urbp_list))
1037                  *      mod_timer(&vhci->timer, jiffies); */
1038                 hcd->state = HC_STATE_RUNNING;
1039         }
1040         spin_unlock_irq(&vhci->lock);
1041         return rc;
1042
1043         return 0;
1044 }
1045
1046 #else
1047
1048 #define vhci_bus_suspend      NULL
1049 #define vhci_bus_resume       NULL
1050 #endif
1051
1052
1053
1054 static struct hc_driver vhci_hc_driver = {
1055         .description    = driver_name,
1056         .product_desc   = driver_desc,
1057         .hcd_priv_size  = sizeof(struct vhci_hcd),
1058
1059         .flags          = HCD_USB2,
1060
1061         .start          = vhci_start,
1062         .stop           = vhci_stop,
1063
1064         .urb_enqueue    = vhci_urb_enqueue,
1065         .urb_dequeue    = vhci_urb_dequeue,
1066
1067         .get_frame_number = vhci_get_frame_number,
1068
1069         .hub_status_data = vhci_hub_status,
1070         .hub_control    = vhci_hub_control,
1071         .bus_suspend    = vhci_bus_suspend,
1072         .bus_resume     = vhci_bus_resume,
1073 };
1074
1075 static int vhci_hcd_probe(struct platform_device *pdev)
1076 {
1077         struct usb_hcd          *hcd;
1078         int                     ret;
1079
1080         uinfo("proving...\n");
1081
1082         dbg_vhci_hc("name %s id %d\n", pdev->name, pdev->id);
1083
1084         /* will be removed */
1085         if (pdev->dev.dma_mask) {
1086                 dev_info(&pdev->dev, "vhci_hcd DMA not supported\n");
1087                 return -EINVAL;
1088         }
1089
1090         /*
1091          * Allocate and initialize hcd.
1092          * Our private data is also allocated automatically.
1093          */
1094         hcd = usb_create_hcd(&vhci_hc_driver, &pdev->dev, dev_name(&pdev->dev));
1095         if (!hcd) {
1096                 uerr("create hcd failed\n");
1097                 return -ENOMEM;
1098         }
1099
1100
1101         /* this is private data for vhci_hcd */
1102         the_controller = hcd_to_vhci(hcd);
1103
1104         /*
1105          * Finish generic HCD structure initialization and register.
1106          * Call the driver's reset() and start() routines.
1107          */
1108         ret = usb_add_hcd(hcd, 0, 0);
1109         if (ret != 0) {
1110                 uerr("usb_add_hcd failed %d\n", ret);
1111                 usb_put_hcd(hcd);
1112                 the_controller = NULL;
1113                 return ret;
1114         }
1115
1116
1117         dbg_vhci_hc("bye\n");
1118         return 0;
1119 }
1120
1121
1122 static int vhci_hcd_remove(struct platform_device *pdev)
1123 {
1124         struct usb_hcd  *hcd;
1125
1126         hcd = platform_get_drvdata(pdev);
1127         if (!hcd)
1128                 return 0;
1129
1130         /*
1131          * Disconnects the root hub,
1132          * then reverses the effects of usb_add_hcd(),
1133          * invoking the HCD's stop() methods.
1134          */
1135         usb_remove_hcd(hcd);
1136         usb_put_hcd(hcd);
1137         the_controller = NULL;
1138
1139
1140         return 0;
1141 }
1142
1143
1144
1145 #ifdef CONFIG_PM
1146
1147 /* what should happen for USB/IP under suspend/resume? */
1148 static int vhci_hcd_suspend(struct platform_device *pdev, pm_message_t state)
1149 {
1150         struct usb_hcd *hcd;
1151         int rhport = 0;
1152         int connected = 0;
1153         int ret = 0;
1154
1155         dev_dbg(&pdev->dev, "%s\n", __func__);
1156
1157         hcd = platform_get_drvdata(pdev);
1158
1159         spin_lock(&the_controller->lock);
1160
1161         for (rhport = 0; rhport < VHCI_NPORTS; rhport++)
1162                 if (the_controller->port_status[rhport] &
1163                                                 USB_PORT_STAT_CONNECTION)
1164                         connected += 1;
1165
1166         spin_unlock(&the_controller->lock);
1167
1168         if (connected > 0) {
1169                 uinfo("We have %d active connection%s. Do not suspend.\n",
1170                                 connected, (connected == 1 ? "" : "s"));
1171                 ret =  -EBUSY;
1172         } else {
1173                 uinfo("suspend vhci_hcd");
1174                 clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
1175         }
1176
1177         return ret;
1178 }
1179
1180 static int vhci_hcd_resume(struct platform_device *pdev)
1181 {
1182         struct usb_hcd *hcd;
1183
1184         dev_dbg(&pdev->dev, "%s\n", __func__);
1185
1186         hcd = platform_get_drvdata(pdev);
1187         set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
1188         usb_hcd_poll_rh_status(hcd);
1189
1190         return 0;
1191 }
1192
1193 #else
1194
1195 #define vhci_hcd_suspend        NULL
1196 #define vhci_hcd_resume         NULL
1197
1198 #endif
1199
1200
1201 static struct platform_driver vhci_driver = {
1202         .probe  = vhci_hcd_probe,
1203         .remove = __devexit_p(vhci_hcd_remove),
1204         .suspend = vhci_hcd_suspend,
1205         .resume = vhci_hcd_resume,
1206         .driver = {
1207                 .name = (char *) driver_name,
1208                 .owner = THIS_MODULE,
1209         },
1210 };
1211
1212 /*----------------------------------------------------------------------*/
1213
1214 /*
1215  * The VHCI 'device' is 'virtual'; not a real plug&play hardware.
1216  * We need to add this virtual device as a platform device arbitrarily:
1217  *      1. platform_device_register()
1218  */
1219 static void the_pdev_release(struct device *dev)
1220 {
1221         return;
1222 }
1223
1224 static struct platform_device the_pdev = {
1225         /* should be the same name as driver_name */
1226         .name = (char *) driver_name,
1227         .id = -1,
1228         .dev = {
1229                 /* .driver = &vhci_driver, */
1230                 .release = the_pdev_release,
1231         },
1232 };
1233
1234 static int __init vhci_init(void)
1235 {
1236         int ret;
1237
1238         dbg_vhci_hc("enter\n");
1239         if (usb_disabled())
1240                 return -ENODEV;
1241
1242         printk(KERN_INFO KBUILD_MODNAME ": %s, %s\n", driver_name,
1243                DRIVER_VERSION);
1244
1245         ret = platform_driver_register(&vhci_driver);
1246         if (ret < 0)
1247                 goto err_driver_register;
1248
1249         ret = platform_device_register(&the_pdev);
1250         if (ret < 0)
1251                 goto err_platform_device_register;
1252
1253         dbg_vhci_hc("bye\n");
1254         return ret;
1255
1256         /* error occurred */
1257 err_platform_device_register:
1258         platform_driver_unregister(&vhci_driver);
1259
1260 err_driver_register:
1261         dbg_vhci_hc("bye\n");
1262         return ret;
1263 }
1264 module_init(vhci_init);
1265
1266 static void __exit vhci_cleanup(void)
1267 {
1268         dbg_vhci_hc("enter\n");
1269
1270         platform_device_unregister(&the_pdev);
1271         platform_driver_unregister(&vhci_driver);
1272
1273         dbg_vhci_hc("bye\n");
1274 }
1275 module_exit(vhci_cleanup);