drivers/usb/gadget/dummy_hcd.c

   1 /*
   2  * dummy_hcd.c -- Dummy/Loopback USB host and device emulator driver.
   3  *
   4  * Maintainer: Alan Stern <stern@rowland.harvard.edu>
   5  *
   6  * Copyright (C) 2003 David Brownell
   7  * Copyright (C) 2003-2005 Alan Stern
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  22  */
  23
  24
  25 /*
  26  * This exposes a device side "USB gadget" API, driven by requests to a
  27  * Linux-USB host controller driver.  USB traffic is simulated; there's
  28  * no need for USB hardware.  Use this with two other drivers:
  29  *
  30  *  - Gadget driver, responding to requests (slave);
  31  *  - Host-side device driver, as already familiar in Linux.
  32  *
  33  * Having this all in one kernel can help some stages of development,
  34  * bypassing some hardware (and driver) issues.  UML could help too.
  35  */
  36
  37 #include <linux/module.h>
  38 #include <linux/kernel.h>
  39 #include <linux/delay.h>
  40 #include <linux/ioport.h>
  41 #include <linux/slab.h>
  42 #include <linux/errno.h>
  43 #include <linux/init.h>
  44 #include <linux/timer.h>
  45 #include <linux/list.h>
  46 #include <linux/interrupt.h>
  47 #include <linux/platform_device.h>
  48 #include <linux/usb.h>
  49 #include <linux/usb_gadget.h>
  50
  51 #include <asm/byteorder.h>
  52 #include <asm/io.h>
  53 #include <asm/irq.h>
  54 #include <asm/system.h>
  55 #include <asm/unaligned.h>
  56
  57
  58 #include "../core/hcd.h"
  59
  60
  61 #define DRIVER_DESC     "USB Host+Gadget Emulator"
  62 #define DRIVER_VERSION  "02 May 2005"
  63
  64 static const char       driver_name [] = "dummy_hcd";
  65 static const char       driver_desc [] = "USB Host+Gadget Emulator";
  66
  67 static const char       gadget_name [] = "dummy_udc";
  68
  69 MODULE_DESCRIPTION (DRIVER_DESC);
  70 MODULE_AUTHOR ("David Brownell");
  71 MODULE_LICENSE ("GPL");
  72
  73 /*-------------------------------------------------------------------------*/
  74
  75 /* gadget side driver data structres */
  76 struct dummy_ep {
  77         struct list_head                queue;
  78         unsigned long                   last_io;        /* jiffies timestamp */
  79         struct usb_gadget               *gadget;
  80         const struct usb_endpoint_descriptor *desc;
  81         struct usb_ep                   ep;
  82         unsigned                        halted : 1;
  83         unsigned                        already_seen : 1;
  84         unsigned                        setup_stage : 1;
  85 };
  86
  87 struct dummy_request {
  88         struct list_head                queue;          /* ep's requests */
  89         struct usb_request              req;
  90 };
  91
  92 static inline struct dummy_ep *usb_ep_to_dummy_ep (struct usb_ep *_ep)
  93 {
  94         return container_of (_ep, struct dummy_ep, ep);
  95 }
  96
  97 static inline struct dummy_request *usb_request_to_dummy_request
  98                 (struct usb_request *_req)
  99 {
 100         return container_of (_req, struct dummy_request, req);
 101 }
 102
 103 /*-------------------------------------------------------------------------*/
 104
 105 /*
 106  * Every device has ep0 for control requests, plus up to 30 more endpoints,
 107  * in one of two types:
 108  *
 109  *   - Configurable:  direction (in/out), type (bulk, iso, etc), and endpoint
 110  *     number can be changed.  Names like "ep-a" are used for this type.
 111  *
 112  *   - Fixed Function:  in other cases.  some characteristics may be mutable;
 113  *     that'd be hardware-specific.  Names like "ep12out-bulk" are used.
 114  *
 115  * Gadget drivers are responsible for not setting up conflicting endpoint
 116  * configurations, illegal or unsupported packet lengths, and so on.
 117  */
 118
 119 static const char ep0name [] = "ep0";
 120
 121 static const char *const ep_name [] = {
 122         ep0name,                                /* everyone has ep0 */
 123
 124         /* act like a net2280: high speed, six configurable endpoints */
 125         "ep-a", "ep-b", "ep-c", "ep-d", "ep-e", "ep-f",
 126
 127         /* or like pxa250: fifteen fixed function endpoints */
 128         "ep1in-bulk", "ep2out-bulk", "ep3in-iso", "ep4out-iso", "ep5in-int",
 129         "ep6in-bulk", "ep7out-bulk", "ep8in-iso", "ep9out-iso", "ep10in-int",
 130         "ep11in-bulk", "ep12out-bulk", "ep13in-iso", "ep14out-iso",
 131                 "ep15in-int",
 132
 133         /* or like sa1100: two fixed function endpoints */
 134         "ep1out-bulk", "ep2in-bulk",
 135 };
 136 #define DUMMY_ENDPOINTS ARRAY_SIZE(ep_name)
 137
 138 /*-------------------------------------------------------------------------*/
 139
 140 #define FIFO_SIZE               64
 141
 142 struct urbp {
 143         struct urb              *urb;
 144         struct list_head        urbp_list;
 145 };
 146
 147
 148 enum dummy_rh_state {
 149         DUMMY_RH_RESET,
 150         DUMMY_RH_SUSPENDED,
 151         DUMMY_RH_RUNNING
 152 };
 153
 154 struct dummy {
 155         spinlock_t                      lock;
 156
 157         /*
 158          * SLAVE/GADGET side support
 159          */
 160         struct dummy_ep                 ep [DUMMY_ENDPOINTS];
 161         int                             address;
 162         struct usb_gadget               gadget;
 163         struct usb_gadget_driver        *driver;
 164         struct dummy_request            fifo_req;
 165         u8                              fifo_buf [FIFO_SIZE];
 166         u16                             devstatus;
 167         unsigned                        udc_suspended:1;
 168         unsigned                        pullup:1;
 169         unsigned                        active:1;
 170         unsigned                        old_active:1;
 171
 172         /*
 173          * MASTER/HOST side support
 174          */
 175         enum dummy_rh_state             rh_state;
 176         struct timer_list               timer;
 177         u32                             port_status;
 178         u32                             old_status;
 179         unsigned                        resuming:1;
 180         unsigned long                   re_timeout;
 181
 182         struct usb_device               *udev;
 183         struct list_head                urbp_list;
 184 };
 185
 186 static inline struct dummy *hcd_to_dummy (struct usb_hcd *hcd)
 187 {
 188         return (struct dummy *) (hcd->hcd_priv);
 189 }
 190
 191 static inline struct usb_hcd *dummy_to_hcd (struct dummy *dum)
 192 {
 193         return container_of((void *) dum, struct usb_hcd, hcd_priv);
 194 }
 195
 196 static inline struct device *dummy_dev (struct dummy *dum)
 197 {
 198         return dummy_to_hcd(dum)->self.controller;
 199 }
 200
 201 static inline struct device *udc_dev (struct dummy *dum)
 202 {
 203         return dum->gadget.dev.parent;
 204 }
 205
 206 static inline struct dummy *ep_to_dummy (struct dummy_ep *ep)
 207 {
 208         return container_of (ep->gadget, struct dummy, gadget);
 209 }
 210
 211 static inline struct dummy *gadget_to_dummy (struct usb_gadget *gadget)
 212 {
 213         return container_of (gadget, struct dummy, gadget);
 214 }
 215
 216 static inline struct dummy *gadget_dev_to_dummy (struct device *dev)
 217 {
 218         return container_of (dev, struct dummy, gadget.dev);
 219 }
 220
 221 static struct dummy                     *the_controller;
 222
 223 /*-------------------------------------------------------------------------*/
 224
 225 /* SLAVE/GADGET SIDE UTILITY ROUTINES */
 226
 227 /* called with spinlock held */
 228 static void nuke (struct dummy *dum, struct dummy_ep *ep)
 229 {
 230         while (!list_empty (&ep->queue)) {
 231                 struct dummy_request    *req;
 232
 233                 req = list_entry (ep->queue.next, struct dummy_request, queue);
 234                 list_del_init (&req->queue);
 235                 req->req.status = -ESHUTDOWN;
 236
 237                 spin_unlock (&dum->lock);
 238                 req->req.complete (&ep->ep, &req->req);
 239                 spin_lock (&dum->lock);
 240         }
 241 }
 242
 243 /* caller must hold lock */
 244 static void
 245 stop_activity (struct dummy *dum)
 246 {
 247         struct dummy_ep *ep;
 248
 249         /* prevent any more requests */
 250         dum->address = 0;
 251
 252         /* The timer is left running so that outstanding URBs can fail */
 253
 254         /* nuke any pending requests first, so driver i/o is quiesced */
 255         list_for_each_entry (ep, &dum->gadget.ep_list, ep.ep_list)
 256                 nuke (dum, ep);
 257
 258         /* driver now does any non-usb quiescing necessary */
 259 }
 260
 261 /* caller must hold lock */
 262 static void
 263 set_link_state (struct dummy *dum)
 264 {
 265         dum->active = 0;
 266         if ((dum->port_status & USB_PORT_STAT_POWER) == 0)
 267                 dum->port_status = 0;
 268
 269         /* UDC suspend must cause a disconnect */
 270         else if (!dum->pullup || dum->udc_suspended) {
 271                 dum->port_status &= ~(USB_PORT_STAT_CONNECTION |
 272                                         USB_PORT_STAT_ENABLE |
 273                                         USB_PORT_STAT_LOW_SPEED |
 274                                         USB_PORT_STAT_HIGH_SPEED |
 275                                         USB_PORT_STAT_SUSPEND);
 276                 if ((dum->old_status & USB_PORT_STAT_CONNECTION) != 0)
 277                         dum->port_status |= (USB_PORT_STAT_C_CONNECTION << 16);
 278         } else {
 279                 dum->port_status |= USB_PORT_STAT_CONNECTION;
 280                 if ((dum->old_status & USB_PORT_STAT_CONNECTION) == 0)
 281                         dum->port_status |= (USB_PORT_STAT_C_CONNECTION << 16);
 282                 if ((dum->port_status & USB_PORT_STAT_ENABLE) == 0)
 283                         dum->port_status &= ~USB_PORT_STAT_SUSPEND;
 284                 else if ((dum->port_status & USB_PORT_STAT_SUSPEND) == 0 &&
 285                                 dum->rh_state != DUMMY_RH_SUSPENDED)
 286                         dum->active = 1;
 287         }
 288
 289         if ((dum->port_status & USB_PORT_STAT_ENABLE) == 0 || dum->active)
 290                 dum->resuming = 0;
 291
 292         if ((dum->port_status & USB_PORT_STAT_CONNECTION) == 0 ||
 293                         (dum->port_status & USB_PORT_STAT_RESET) != 0) {
 294                 if ((dum->old_status & USB_PORT_STAT_CONNECTION) != 0 &&
 295                                 (dum->old_status & USB_PORT_STAT_RESET) == 0 &&
 296                                 dum->driver) {
 297                         stop_activity (dum);
 298                         spin_unlock (&dum->lock);
 299                         dum->driver->disconnect (&dum->gadget);
 300                         spin_lock (&dum->lock);
 301                 }
 302         } else if (dum->active != dum->old_active) {
 303                 if (dum->old_active && dum->driver->suspend) {
 304                         spin_unlock (&dum->lock);
 305                         dum->driver->suspend (&dum->gadget);
 306                         spin_lock (&dum->lock);
 307                 } else if (!dum->old_active && dum->driver->resume) {
 308                         spin_unlock (&dum->lock);
 309                         dum->driver->resume (&dum->gadget);
 310                         spin_lock (&dum->lock);
 311                 }
 312         }
 313
 314         dum->old_status = dum->port_status;
 315         dum->old_active = dum->active;
 316 }
 317
 318 /*-------------------------------------------------------------------------*/
 319
 320 /* SLAVE/GADGET SIDE DRIVER
 321  *
 322  * This only tracks gadget state.  All the work is done when the host
 323  * side tries some (emulated) i/o operation.  Real device controller
 324  * drivers would do real i/o using dma, fifos, irqs, timers, etc.
 325  */
 326
 327 #define is_enabled(dum) \
 328         (dum->port_status & USB_PORT_STAT_ENABLE)
 329
 330 static int
 331 dummy_enable (struct usb_ep *_ep, const struct usb_endpoint_descriptor *desc)
 332 {
 333         struct dummy            *dum;
 334         struct dummy_ep         *ep;
 335         unsigned                max;
 336         int                     retval;
 337
 338         ep = usb_ep_to_dummy_ep (_ep);
 339         if (!_ep || !desc || ep->desc || _ep->name == ep0name
 340                         || desc->bDescriptorType != USB_DT_ENDPOINT)
 341                 return -EINVAL;
 342         dum = ep_to_dummy (ep);
 343         if (!dum->driver || !is_enabled (dum))
 344                 return -ESHUTDOWN;
 345         max = le16_to_cpu(desc->wMaxPacketSize) & 0x3ff;
 346
 347         /* drivers must not request bad settings, since lower levels
 348          * (hardware or its drivers) may not check.  some endpoints
 349          * can't do iso, many have maxpacket limitations, etc.
 350          *
 351          * since this "hardware" driver is here to help debugging, we
 352          * have some extra sanity checks.  (there could be more though,
 353          * especially for "ep9out" style fixed function ones.)
 354          */
 355         retval = -EINVAL;
 356         switch (desc->bmAttributes & 0x03) {
 357         case USB_ENDPOINT_XFER_BULK:
 358                 if (strstr (ep->ep.name, "-iso")
 359                                 || strstr (ep->ep.name, "-int")) {
 360                         goto done;
 361                 }
 362                 switch (dum->gadget.speed) {
 363                 case USB_SPEED_HIGH:
 364                         if (max == 512)
 365                                 break;
 366                         /* conserve return statements */
 367                 default:
 368                         switch (max) {
 369                         case 8: case 16: case 32: case 64:
 370                                 /* we'll fake any legal size */
 371                                 break;
 372                         default:
 373                 case USB_SPEED_LOW:
 374                                 goto done;
 375                         }
 376                 }
 377                 break;
 378         case USB_ENDPOINT_XFER_INT:
 379                 if (strstr (ep->ep.name, "-iso")) /* bulk is ok */
 380                         goto done;
 381                 /* real hardware might not handle all packet sizes */
 382                 switch (dum->gadget.speed) {
 383                 case USB_SPEED_HIGH:
 384                         if (max <= 1024)
 385                                 break;
 386                         /* save a return statement */
 387                 case USB_SPEED_FULL:
 388                         if (max <= 64)
 389                                 break;
 390                         /* save a return statement */
 391                 default:
 392                         if (max <= 8)
 393                                 break;
 394                         goto done;
 395                 }
 396                 break;
 397         case USB_ENDPOINT_XFER_ISOC:
 398                 if (strstr (ep->ep.name, "-bulk")
 399                                 || strstr (ep->ep.name, "-int"))
 400                         goto done;
 401                 /* real hardware might not handle all packet sizes */
 402                 switch (dum->gadget.speed) {
 403                 case USB_SPEED_HIGH:
 404                         if (max <= 1024)
 405                                 break;
 406                         /* save a return statement */
 407                 case USB_SPEED_FULL:
 408                         if (max <= 1023)
 409                                 break;
 410                         /* save a return statement */
 411                 default:
 412                         goto done;
 413                 }
 414                 break;
 415         default:
 416                 /* few chips support control except on ep0 */
 417                 goto done;
 418         }
 419
 420         _ep->maxpacket = max;
 421         ep->desc = desc;
 422
 423         dev_dbg (udc_dev(dum), "enabled %s (ep%d%s-%s) maxpacket %d\n",
 424                 _ep->name,
 425                 desc->bEndpointAddress & 0x0f,
 426                 (desc->bEndpointAddress & USB_DIR_IN) ? "in" : "out",
 427                 ({ char *val;
 428                  switch (desc->bmAttributes & 0x03) {
 429                  case USB_ENDPOINT_XFER_BULK: val = "bulk"; break;
 430                  case USB_ENDPOINT_XFER_ISOC: val = "iso"; break;
 431                  case USB_ENDPOINT_XFER_INT: val = "intr"; break;
 432                  default: val = "ctrl"; break;
 433                  }; val; }),
 434                 max);
 435
 436         /* at this point real hardware should be NAKing transfers
 437          * to that endpoint, until a buffer is queued to it.
 438          */
 439         retval = 0;
 440 done:
 441         return retval;
 442 }
 443
 444 static int dummy_disable (struct usb_ep *_ep)
 445 {
 446         struct dummy_ep         *ep;
 447         struct dummy            *dum;
 448         unsigned long           flags;
 449         int                     retval;
 450
 451         ep = usb_ep_to_dummy_ep (_ep);
 452         if (!_ep || !ep->desc || _ep->name == ep0name)
 453                 return -EINVAL;
 454         dum = ep_to_dummy (ep);
 455
 456         spin_lock_irqsave (&dum->lock, flags);
 457         ep->desc = NULL;
 458         retval = 0;
 459         nuke (dum, ep);
 460         spin_unlock_irqrestore (&dum->lock, flags);
 461
 462         dev_dbg (udc_dev(dum), "disabled %s\n", _ep->name);
 463         return retval;
 464 }
 465
 466 static struct usb_request *
 467 dummy_alloc_request (struct usb_ep *_ep, gfp_t mem_flags)
 468 {
 469         struct dummy_ep         *ep;
 470         struct dummy_request    *req;
 471
 472         if (!_ep)
 473                 return NULL;
 474         ep = usb_ep_to_dummy_ep (_ep);
 475
 476         req = kzalloc(sizeof(*req), mem_flags);
 477         if (!req)
 478                 return NULL;
 479         INIT_LIST_HEAD (&req->queue);
 480         return &req->req;
 481 }
 482
 483 static void
 484 dummy_free_request (struct usb_ep *_ep, struct usb_request *_req)
 485 {
 486         struct dummy_ep         *ep;
 487         struct dummy_request    *req;
 488
 489         ep = usb_ep_to_dummy_ep (_ep);
 490         if (!ep || !_req || (!ep->desc && _ep->name != ep0name))
 491                 return;
 492
 493         req = usb_request_to_dummy_request (_req);
 494         WARN_ON (!list_empty (&req->queue));
 495         kfree (req);
 496 }
 497
 498 static void
 499 fifo_complete (struct usb_ep *ep, struct usb_request *req)
 500 {
 501 }
 502
 503 static int
 504 dummy_queue (struct usb_ep *_ep, struct usb_request *_req,
 505                 gfp_t mem_flags)
 506 {
 507         struct dummy_ep         *ep;
 508         struct dummy_request    *req;
 509         struct dummy            *dum;
 510         unsigned long           flags;
 511
 512         req = usb_request_to_dummy_request (_req);
 513         if (!_req || !list_empty (&req->queue) || !_req->complete)
 514                 return -EINVAL;
 515
 516         ep = usb_ep_to_dummy_ep (_ep);
 517         if (!_ep || (!ep->desc && _ep->name != ep0name))
 518                 return -EINVAL;
 519
 520         dum = ep_to_dummy (ep);
 521         if (!dum->driver || !is_enabled (dum))
 522                 return -ESHUTDOWN;
 523
 524 #if 0
 525         dev_dbg (udc_dev(dum), "ep %p queue req %p to %s, len %d buf %p\n",
 526                         ep, _req, _ep->name, _req->length, _req->buf);
 527 #endif
 528
 529         _req->status = -EINPROGRESS;
 530         _req->actual = 0;
 531         spin_lock_irqsave (&dum->lock, flags);
 532
 533         /* implement an emulated single-request FIFO */
 534         if (ep->desc && (ep->desc->bEndpointAddress & USB_DIR_IN) &&
 535                         list_empty (&dum->fifo_req.queue) &&
 536                         list_empty (&ep->queue) &&
 537                         _req->length <= FIFO_SIZE) {
 538                 req = &dum->fifo_req;
 539                 req->req = *_req;
 540                 req->req.buf = dum->fifo_buf;
 541                 memcpy (dum->fifo_buf, _req->buf, _req->length);
 542                 req->req.context = dum;
 543                 req->req.complete = fifo_complete;
 544
 545                 spin_unlock (&dum->lock);
 546                 _req->actual = _req->length;
 547                 _req->status = 0;
 548                 _req->complete (_ep, _req);
 549                 spin_lock (&dum->lock);
 550         }
 551         list_add_tail (&req->queue, &ep->queue);
 552         spin_unlock_irqrestore (&dum->lock, flags);
 553
 554         /* real hardware would likely enable transfers here, in case
 555          * it'd been left NAKing.
 556          */
 557         return 0;
 558 }
 559
 560 static int dummy_dequeue (struct usb_ep *_ep, struct usb_request *_req)
 561 {
 562         struct dummy_ep         *ep;
 563         struct dummy            *dum;
 564         int                     retval = -EINVAL;
 565         unsigned long           flags;
 566         struct dummy_request    *req = NULL;
 567
 568         if (!_ep || !_req)
 569                 return retval;
 570         ep = usb_ep_to_dummy_ep (_ep);
 571         dum = ep_to_dummy (ep);
 572
 573         if (!dum->driver)
 574                 return -ESHUTDOWN;
 575
 576         local_irq_save (flags);
 577         spin_lock (&dum->lock);
 578         list_for_each_entry (req, &ep->queue, queue) {
 579                 if (&req->req == _req) {
 580                         list_del_init (&req->queue);
 581                         _req->status = -ECONNRESET;
 582                         retval = 0;
 583                         break;
 584                 }
 585         }
 586         spin_unlock (&dum->lock);
 587
 588         if (retval == 0) {
 589                 dev_dbg (udc_dev(dum),
 590                                 "dequeued req %p from %s, len %d buf %p\n",
 591                                 req, _ep->name, _req->length, _req->buf);
 592                 _req->complete (_ep, _req);
 593         }
 594         local_irq_restore (flags);
 595         return retval;
 596 }
 597
 598 static int
 599 dummy_set_halt (struct usb_ep *_ep, int value)
 600 {
 601         struct dummy_ep         *ep;
 602         struct dummy            *dum;
 603
 604         if (!_ep)
 605                 return -EINVAL;
 606         ep = usb_ep_to_dummy_ep (_ep);
 607         dum = ep_to_dummy (ep);
 608         if (!dum->driver)
 609                 return -ESHUTDOWN;
 610         if (!value)
 611                 ep->halted = 0;
 612         else if (ep->desc && (ep->desc->bEndpointAddress & USB_DIR_IN) &&
 613                         !list_empty (&ep->queue))
 614                 return -EAGAIN;
 615         else
 616                 ep->halted = 1;
 617         /* FIXME clear emulated data toggle too */
 618         return 0;
 619 }
 620
 621 static const struct usb_ep_ops dummy_ep_ops = {
 622         .enable         = dummy_enable,
 623         .disable        = dummy_disable,
 624
 625         .alloc_request  = dummy_alloc_request,
 626         .free_request   = dummy_free_request,
 627
 628         .queue          = dummy_queue,
 629         .dequeue        = dummy_dequeue,
 630
 631         .set_halt       = dummy_set_halt,
 632 };
 633
 634 /*-------------------------------------------------------------------------*/
 635
 636 /* there are both host and device side versions of this call ... */
 637 static int dummy_g_get_frame (struct usb_gadget *_gadget)
 638 {
 639         struct timeval  tv;
 640
 641         do_gettimeofday (&tv);
 642         return tv.tv_usec / 1000;
 643 }
 644
 645 static int dummy_wakeup (struct usb_gadget *_gadget)
 646 {
 647         struct dummy    *dum;
 648
 649         dum = gadget_to_dummy (_gadget);
 650         if (!(dum->devstatus &  ( (1 << USB_DEVICE_B_HNP_ENABLE)
 651                                 | (1 << USB_DEVICE_REMOTE_WAKEUP))))
 652                 return -EINVAL;
 653         if ((dum->port_status & USB_PORT_STAT_CONNECTION) == 0)
 654                 return -ENOLINK;
 655         if ((dum->port_status & USB_PORT_STAT_SUSPEND) == 0 &&
 656                          dum->rh_state != DUMMY_RH_SUSPENDED)
 657                 return -EIO;
 658
 659         /* FIXME: What if the root hub is suspended but the port isn't? */
 660
 661         /* hub notices our request, issues downstream resume, etc */
 662         dum->resuming = 1;
 663         dum->re_timeout = jiffies + msecs_to_jiffies(20);
 664         mod_timer (&dummy_to_hcd (dum)->rh_timer, dum->re_timeout);
 665         return 0;
 666 }
 667
 668 static int dummy_set_selfpowered (struct usb_gadget *_gadget, int value)
 669 {
 670         struct dummy    *dum;
 671
 672         dum = gadget_to_dummy (_gadget);
 673         if (value)
 674                 dum->devstatus |= (1 << USB_DEVICE_SELF_POWERED);
 675         else
 676                 dum->devstatus &= ~(1 << USB_DEVICE_SELF_POWERED);
 677         return 0;
 678 }
 679
 680 static int dummy_pullup (struct usb_gadget *_gadget, int value)
 681 {
 682         struct dummy    *dum;
 683         unsigned long   flags;
 684
 685         dum = gadget_to_dummy (_gadget);
 686         spin_lock_irqsave (&dum->lock, flags);
 687         dum->pullup = (value != 0);
 688         set_link_state (dum);
 689         spin_unlock_irqrestore (&dum->lock, flags);
 690
 691         usb_hcd_poll_rh_status (dummy_to_hcd (dum));
 692         return 0;
 693 }
 694
 695 static const struct usb_gadget_ops dummy_ops = {
 696         .get_frame      = dummy_g_get_frame,
 697         .wakeup         = dummy_wakeup,
 698         .set_selfpowered = dummy_set_selfpowered,
 699         .pullup         = dummy_pullup,
 700 };
 701
 702 /*-------------------------------------------------------------------------*/
 703
 704 /* "function" sysfs attribute */
 705 static ssize_t
 706 show_function (struct device *dev, struct device_attribute *attr, char *buf)
 707 {
 708         struct dummy    *dum = gadget_dev_to_dummy (dev);
 709
 710         if (!dum->driver || !dum->driver->function)
 711                 return 0;
 712         return scnprintf (buf, PAGE_SIZE, "%s\n", dum->driver->function);
 713 }
 714 static DEVICE_ATTR (function, S_IRUGO, show_function, NULL);
 715
 716 /*-------------------------------------------------------------------------*/
 717
 718 /*
 719  * Driver registration/unregistration.
 720  *
 721  * This is basically hardware-specific; there's usually only one real USB
 722  * device (not host) controller since that's how USB devices are intended
 723  * to work.  So most implementations of these api calls will rely on the
 724  * fact that only one driver will ever bind to the hardware.  But curious
 725  * hardware can be built with discrete components, so the gadget API doesn't
 726  * require that assumption.
 727  *
 728  * For this emulator, it might be convenient to create a usb slave device
 729  * for each driver that registers:  just add to a big root hub.
 730  */
 731
 732 int
 733 usb_gadget_register_driver (struct usb_gadget_driver *driver)
 734 {
 735         struct dummy    *dum = the_controller;
 736         int             retval, i;
 737
 738         if (!dum)
 739                 return -EINVAL;
 740         if (dum->driver)
 741                 return -EBUSY;
 742         if (!driver->bind || !driver->setup
 743                         || driver->speed == USB_SPEED_UNKNOWN)
 744                 return -EINVAL;
 745
 746         /*
 747          * SLAVE side init ... the layer above hardware, which
 748          * can't enumerate without help from the driver we're binding.
 749          */
 750
 751         dum->devstatus = 0;
 752
 753         INIT_LIST_HEAD (&dum->gadget.ep_list);
 754         for (i = 0; i < DUMMY_ENDPOINTS; i++) {
 755                 struct dummy_ep *ep = &dum->ep [i];
 756
 757                 if (!ep_name [i])
 758                         break;
 759                 ep->ep.name = ep_name [i];
 760                 ep->ep.ops = &dummy_ep_ops;
 761                 list_add_tail (&ep->ep.ep_list, &dum->gadget.ep_list);
 762                 ep->halted = ep->already_seen = ep->setup_stage = 0;
 763                 ep->ep.maxpacket = ~0;
 764                 ep->last_io = jiffies;
 765                 ep->gadget = &dum->gadget;
 766                 ep->desc = NULL;
 767                 INIT_LIST_HEAD (&ep->queue);
 768         }
 769
 770         dum->gadget.ep0 = &dum->ep [0].ep;
 771         dum->ep [0].ep.maxpacket = 64;
 772         list_del_init (&dum->ep [0].ep.ep_list);
 773         INIT_LIST_HEAD(&dum->fifo_req.queue);
 774
 775         dum->driver = driver;
 776         dum->gadget.dev.driver = &driver->driver;
 777         dev_dbg (udc_dev(dum), "binding gadget driver '%s'\n",
 778                         driver->driver.name);
 779         if ((retval = driver->bind (&dum->gadget)) != 0)
 780                 goto err_bind_gadget;
 781
 782         driver->driver.bus = dum->gadget.dev.parent->bus;
 783         if ((retval = driver_register (&driver->driver)) != 0)
 784                 goto err_register;
 785         if ((retval = device_bind_driver (&dum->gadget.dev)) != 0)
 786                 goto err_bind_driver;
 787
 788         /* khubd will enumerate this in a while */
 789         spin_lock_irq (&dum->lock);
 790         dum->pullup = 1;
 791         set_link_state (dum);
 792         spin_unlock_irq (&dum->lock);
 793
 794         usb_hcd_poll_rh_status (dummy_to_hcd (dum));
 795         return 0;
 796
 797 err_bind_driver:
 798         driver_unregister (&driver->driver);
 799 err_register:
 800         if (driver->unbind)
 801                 driver->unbind (&dum->gadget);
 802         spin_lock_irq (&dum->lock);
 803         dum->pullup = 0;
 804         set_link_state (dum);
 805         spin_unlock_irq (&dum->lock);
 806 err_bind_gadget:
 807         dum->driver = NULL;
 808         dum->gadget.dev.driver = NULL;
 809         return retval;
 810 }
 811 EXPORT_SYMBOL (usb_gadget_register_driver);
 812
 813 int
 814 usb_gadget_unregister_driver (struct usb_gadget_driver *driver)
 815 {
 816         struct dummy    *dum = the_controller;
 817         unsigned long   flags;
 818
 819         if (!dum)
 820                 return -ENODEV;
 821         if (!driver || driver != dum->driver || !driver->unbind)
 822                 return -EINVAL;
 823
 824         dev_dbg (udc_dev(dum), "unregister gadget driver '%s'\n",
 825                         driver->driver.name);
 826
 827         spin_lock_irqsave (&dum->lock, flags);
 828         dum->pullup = 0;
 829         set_link_state (dum);
 830         spin_unlock_irqrestore (&dum->lock, flags);
 831
 832         driver->unbind (&dum->gadget);
 833         dum->driver = NULL;
 834
 835         device_release_driver (&dum->gadget.dev);
 836         driver_unregister (&driver->driver);
 837
 838         spin_lock_irqsave (&dum->lock, flags);
 839         dum->pullup = 0;
 840         set_link_state (dum);
 841         spin_unlock_irqrestore (&dum->lock, flags);
 842
 843         usb_hcd_poll_rh_status (dummy_to_hcd (dum));
 844         return 0;
 845 }
 846 EXPORT_SYMBOL (usb_gadget_unregister_driver);
 847
 848 #undef is_enabled
 849
 850 /* just declare this in any driver that really need it */
 851 extern int net2280_set_fifo_mode (struct usb_gadget *gadget, int mode);
 852
 853 int net2280_set_fifo_mode (struct usb_gadget *gadget, int mode)
 854 {
 855         return -ENOSYS;
 856 }
 857 EXPORT_SYMBOL (net2280_set_fifo_mode);
 858
 859
 860 /* The gadget structure is stored inside the hcd structure and will be
 861  * released along with it. */
 862 static void
 863 dummy_gadget_release (struct device *dev)
 864 {
 865         struct dummy    *dum = gadget_dev_to_dummy (dev);
 866
 867         usb_put_hcd (dummy_to_hcd (dum));
 868 }
 869
 870 static int dummy_udc_probe (struct platform_device *pdev)
 871 {
 872         struct dummy    *dum = the_controller;
 873         int             rc;
 874
 875         dum->gadget.name = gadget_name;
 876         dum->gadget.ops = &dummy_ops;
 877         dum->gadget.is_dualspeed = 1;
 878
 879         /* maybe claim OTG support, though we won't complete HNP */
 880         dum->gadget.is_otg = (dummy_to_hcd(dum)->self.otg_port != 0);
 881
 882         strcpy (dum->gadget.dev.bus_id, "gadget");
 883         dum->gadget.dev.parent = &pdev->dev;
 884         dum->gadget.dev.release = dummy_gadget_release;
 885         rc = device_register (&dum->gadget.dev);
 886         if (rc < 0)
 887                 return rc;
 888
 889         usb_get_hcd (dummy_to_hcd (dum));
 890
 891         platform_set_drvdata (pdev, dum);
 892         rc = device_create_file (&dum->gadget.dev, &dev_attr_function);
 893         if (rc < 0)
 894                 device_unregister (&dum->gadget.dev);
 895         return rc;
 896 }
 897
 898 static int dummy_udc_remove (struct platform_device *pdev)
 899 {
 900         struct dummy    *dum = platform_get_drvdata (pdev);
 901
 902         platform_set_drvdata (pdev, NULL);
 903         device_remove_file (&dum->gadget.dev, &dev_attr_function);
 904         device_unregister (&dum->gadget.dev);
 905         return 0;
 906 }
 907
 908 static int dummy_udc_suspend (struct platform_device *pdev, pm_message_t state)
 909 {
 910         struct dummy    *dum = platform_get_drvdata(pdev);
 911
 912         dev_dbg (&pdev->dev, "%s\n", __FUNCTION__);
 913         spin_lock_irq (&dum->lock);
 914         dum->udc_suspended = 1;
 915         set_link_state (dum);
 916         spin_unlock_irq (&dum->lock);
 917
 918         pdev->dev.power.power_state = state;
 919         usb_hcd_poll_rh_status (dummy_to_hcd (dum));
 920         return 0;
 921 }
 922
 923 static int dummy_udc_resume (struct platform_device *pdev)
 924 {
 925         struct dummy    *dum = platform_get_drvdata(pdev);
 926
 927         dev_dbg (&pdev->dev, "%s\n", __FUNCTION__);
 928         spin_lock_irq (&dum->lock);
 929         dum->udc_suspended = 0;
 930         set_link_state (dum);
 931         spin_unlock_irq (&dum->lock);
 932
 933         pdev->dev.power.power_state = PMSG_ON;
 934         usb_hcd_poll_rh_status (dummy_to_hcd (dum));
 935         return 0;
 936 }
 937
 938 static struct platform_driver dummy_udc_driver = {
 939         .probe          = dummy_udc_probe,
 940         .remove         = dummy_udc_remove,
 941         .suspend        = dummy_udc_suspend,
 942         .resume         = dummy_udc_resume,
 943         .driver         = {
 944                 .name   = (char *) gadget_name,
 945                 .owner  = THIS_MODULE,
 946         },
 947 };
 948
 949 /*-------------------------------------------------------------------------*/
 950
 951 /* MASTER/HOST SIDE DRIVER
 952  *
 953  * this uses the hcd framework to hook up to host side drivers.
 954  * its root hub will only have one device, otherwise it acts like
 955  * a normal host controller.
 956  *
 957  * when urbs are queued, they're just stuck on a list that we
 958  * scan in a timer callback.  that callback connects writes from
 959  * the host with reads from the device, and so on, based on the
 960  * usb 2.0 rules.
 961  */
 962
 963 static int dummy_urb_enqueue (
 964         struct usb_hcd                  *hcd,
 965         struct usb_host_endpoint        *ep,
 966         struct urb                      *urb,
 967         gfp_t                           mem_flags
 968 ) {
 969         struct dummy    *dum;
 970         struct urbp     *urbp;
 971         unsigned long   flags;
 972
 973         if (!urb->transfer_buffer && urb->transfer_buffer_length)
 974                 return -EINVAL;
 975
 976         urbp = kmalloc (sizeof *urbp, mem_flags);
 977         if (!urbp)
 978                 return -ENOMEM;
 979         urbp->urb = urb;
 980
 981         dum = hcd_to_dummy (hcd);
 982         spin_lock_irqsave (&dum->lock, flags);
 983
 984         if (!dum->udev) {
 985                 dum->udev = urb->dev;
 986                 usb_get_dev (dum->udev);
 987         } else if (unlikely (dum->udev != urb->dev))
 988                 dev_err (dummy_dev(dum), "usb_device address has changed!\n");
 989
 990         list_add_tail (&urbp->urbp_list, &dum->urbp_list);
 991         urb->hcpriv = urbp;
 992         if (usb_pipetype (urb->pipe) == PIPE_CONTROL)
 993                 urb->error_count = 1;           /* mark as a new urb */
 994
 995         /* kick the scheduler, it'll do the rest */
 996         if (!timer_pending (&dum->timer))
 997                 mod_timer (&dum->timer, jiffies + 1);
 998
 999         spin_unlock_irqrestore (&dum->lock, flags);
1000         return 0;
1001 }
1002
1003 static int dummy_urb_dequeue (struct usb_hcd *hcd, struct urb *urb)
1004 {
1005         struct dummy    *dum;
1006         unsigned long   flags;
1007
1008         /* giveback happens automatically in timer callback,
1009          * so make sure the callback happens */
1010         dum = hcd_to_dummy (hcd);
1011         spin_lock_irqsave (&dum->lock, flags);
1012         if (dum->rh_state != DUMMY_RH_RUNNING && !list_empty(&dum->urbp_list))
1013                 mod_timer (&dum->timer, jiffies);
1014         spin_unlock_irqrestore (&dum->lock, flags);
1015         return 0;
1016 }
1017
1018 static void maybe_set_status (struct urb *urb, int status)
1019 {
1020         spin_lock (&urb->lock);
1021         if (urb->status == -EINPROGRESS)
1022                 urb->status = status;
1023         spin_unlock (&urb->lock);
1024 }
1025
1026 /* transfer up to a frame's worth; caller must own lock */
1027 static int
1028 transfer (struct dummy *dum, struct urb *urb, struct dummy_ep *ep, int limit)
1029 {
1030         struct dummy_request    *req;
1031
1032 top:
1033         /* if there's no request queued, the device is NAKing; return */
1034         list_for_each_entry (req, &ep->queue, queue) {
1035                 unsigned        host_len, dev_len, len;
1036                 int             is_short, to_host;
1037                 int             rescan = 0;
1038
1039                 /* 1..N packets of ep->ep.maxpacket each ... the last one
1040                  * may be short (including zero length).
1041                  *
1042                  * writer can send a zlp explicitly (length 0) or implicitly
1043                  * (length mod maxpacket zero, and 'zero' flag); they always
1044                  * terminate reads.
1045                  */
1046                 host_len = urb->transfer_buffer_length - urb->actual_length;
1047                 dev_len = req->req.length - req->req.actual;
1048                 len = min (host_len, dev_len);
1049
1050                 /* FIXME update emulated data toggle too */
1051
1052                 to_host = usb_pipein (urb->pipe);
1053                 if (unlikely (len == 0))
1054                         is_short = 1;
1055                 else {
1056                         char            *ubuf, *rbuf;
1057
1058                         /* not enough bandwidth left? */
1059                         if (limit < ep->ep.maxpacket && limit < len)
1060                                 break;
1061                         len = min (len, (unsigned) limit);
1062                         if (len == 0)
1063                                 break;
1064
1065                         /* use an extra pass for the final short packet */
1066                         if (len > ep->ep.maxpacket) {
1067                                 rescan = 1;
1068                                 len -= (len % ep->ep.maxpacket);
1069                         }
1070                         is_short = (len % ep->ep.maxpacket) != 0;
1071
1072                         /* else transfer packet(s) */
1073                         ubuf = urb->transfer_buffer + urb->actual_length;
1074                         rbuf = req->req.buf + req->req.actual;
1075                         if (to_host)
1076                                 memcpy (ubuf, rbuf, len);
1077                         else
1078                                 memcpy (rbuf, ubuf, len);
1079                         ep->last_io = jiffies;
1080
1081                         limit -= len;
1082                         urb->actual_length += len;
1083                         req->req.actual += len;
1084                 }
1085
1086                 /* short packets terminate, maybe with overflow/underflow.
1087                  * it's only really an error to write too much.
1088                  *
1089                  * partially filling a buffer optionally blocks queue advances
1090                  * (so completion handlers can clean up the queue) but we don't
1091                  * need to emulate such data-in-flight.  so we only show part
1092                  * of the URB_SHORT_NOT_OK effect: completion status.
1093                  */
1094                 if (is_short) {
1095                         if (host_len == dev_len) {
1096                                 req->req.status = 0;
1097                                 maybe_set_status (urb, 0);
1098                         } else if (to_host) {
1099                                 req->req.status = 0;
1100                                 if (dev_len > host_len)
1101                                         maybe_set_status (urb, -EOVERFLOW);
1102                                 else
1103                                         maybe_set_status (urb,
1104                                                 (urb->transfer_flags
1105                                                         & URB_SHORT_NOT_OK)
1106                                                 ? -EREMOTEIO : 0);
1107                         } else if (!to_host) {
1108                                 maybe_set_status (urb, 0);
1109                                 if (host_len > dev_len)
1110                                         req->req.status = -EOVERFLOW;
1111                                 else
1112                                         req->req.status = 0;
1113                         }
1114
1115                 /* many requests terminate without a short packet */
1116                 } else {
1117                         if (req->req.length == req->req.actual
1118                                         && !req->req.zero)
1119                                 req->req.status = 0;
1120                         if (urb->transfer_buffer_length == urb->actual_length
1121                                         && !(urb->transfer_flags
1122                                                 & URB_ZERO_PACKET)) {
1123                                 maybe_set_status (urb, 0);
1124                         }
1125                 }
1126
1127                 /* device side completion --> continuable */
1128                 if (req->req.status != -EINPROGRESS) {
1129                         list_del_init (&req->queue);
1130
1131                         spin_unlock (&dum->lock);
1132                         req->req.complete (&ep->ep, &req->req);
1133                         spin_lock (&dum->lock);
1134
1135                         /* requests might have been unlinked... */
1136                         rescan = 1;
1137                 }
1138
1139                 /* host side completion --> terminate */
1140                 if (urb->status != -EINPROGRESS)
1141                         break;
1142
1143                 /* rescan to continue with any other queued i/o */
1144                 if (rescan)
1145                         goto top;
1146         }
1147         return limit;
1148 }
1149
1150 static int periodic_bytes (struct dummy *dum, struct dummy_ep *ep)
1151 {
1152         int     limit = ep->ep.maxpacket;
1153
1154         if (dum->gadget.speed == USB_SPEED_HIGH) {
1155                 int     tmp;
1156
1157                 /* high bandwidth mode */
1158                 tmp = le16_to_cpu(ep->desc->wMaxPacketSize);
1159                 tmp = (tmp >> 11) & 0x03;
1160                 tmp *= 8 /* applies to entire frame */;
1161                 limit += limit * tmp;
1162         }
1163         return limit;
1164 }
1165
1166 #define is_active(dum)  ((dum->port_status & \
1167                 (USB_PORT_STAT_CONNECTION | USB_PORT_STAT_ENABLE | \
1168                         USB_PORT_STAT_SUSPEND)) \
1169                 == (USB_PORT_STAT_CONNECTION | USB_PORT_STAT_ENABLE))
1170
1171 static struct dummy_ep *find_endpoint (struct dummy *dum, u8 address)
1172 {
1173         int             i;
1174
1175         if (!is_active (dum))
1176                 return NULL;
1177         if ((address & ~USB_DIR_IN) == 0)
1178                 return &dum->ep [0];
1179         for (i = 1; i < DUMMY_ENDPOINTS; i++) {
1180                 struct dummy_ep *ep = &dum->ep [i];
1181
1182                 if (!ep->desc)
1183                         continue;
1184                 if (ep->desc->bEndpointAddress == address)
1185                         return ep;
1186         }
1187         return NULL;
1188 }
1189
1190 #undef is_active
1191
1192 #define Dev_Request     (USB_TYPE_STANDARD | USB_RECIP_DEVICE)
1193 #define Dev_InRequest   (Dev_Request | USB_DIR_IN)
1194 #define Intf_Request    (USB_TYPE_STANDARD | USB_RECIP_INTERFACE)
1195 #define Intf_InRequest  (Intf_Request | USB_DIR_IN)
1196 #define Ep_Request      (USB_TYPE_STANDARD | USB_RECIP_ENDPOINT)
1197 #define Ep_InRequest    (Ep_Request | USB_DIR_IN)
1198
1199 /* drive both sides of the transfers; looks like irq handlers to
1200  * both drivers except the callbacks aren't in_irq().
1201  */
1202 static void dummy_timer (unsigned long _dum)
1203 {
1204         struct dummy            *dum = (struct dummy *) _dum;
1205         struct urbp             *urbp, *tmp;
1206         unsigned long           flags;
1207         int                     limit, total;
1208         int                     i;
1209
1210         /* simplistic model for one frame's bandwidth */
1211         switch (dum->gadget.speed) {
1212         case USB_SPEED_LOW:
1213                 total = 8/*bytes*/ * 12/*packets*/;
1214                 break;
1215         case USB_SPEED_FULL:
1216                 total = 64/*bytes*/ * 19/*packets*/;
1217                 break;
1218         case USB_SPEED_HIGH:
1219                 total = 512/*bytes*/ * 13/*packets*/ * 8/*uframes*/;
1220                 break;
1221         default:
1222                 dev_err (dummy_dev(dum), "bogus device speed\n");
1223                 return;
1224         }
1225
1226         /* FIXME if HZ != 1000 this will probably misbehave ... */
1227
1228         /* look at each urb queued by the host side driver */
1229         spin_lock_irqsave (&dum->lock, flags);
1230
1231         if (!dum->udev) {
1232                 dev_err (dummy_dev(dum),
1233                                 "timer fired with no URBs pending?\n");
1234                 spin_unlock_irqrestore (&dum->lock, flags);
1235                 return;
1236         }
1237
1238         for (i = 0; i < DUMMY_ENDPOINTS; i++) {
1239                 if (!ep_name [i])
1240                         break;
1241                 dum->ep [i].already_seen = 0;
1242         }
1243
1244 restart:
1245         list_for_each_entry_safe (urbp, tmp, &dum->urbp_list, urbp_list) {
1246                 struct urb              *urb;
1247                 struct dummy_request    *req;
1248                 u8                      address;
1249                 struct dummy_ep         *ep = NULL;
1250                 int                     type;
1251
1252                 urb = urbp->urb;
1253                 if (urb->status != -EINPROGRESS) {
1254                         /* likely it was just unlinked */
1255                         goto return_urb;
1256                 } else if (dum->rh_state != DUMMY_RH_RUNNING)
1257                         continue;
1258                 type = usb_pipetype (urb->pipe);
1259
1260                 /* used up this frame's non-periodic bandwidth?
1261                  * FIXME there's infinite bandwidth for control and
1262                  * periodic transfers ... unrealistic.
1263                  */
1264                 if (total <= 0 && type == PIPE_BULK)
1265                         continue;
1266
1267                 /* find the gadget's ep for this request (if configured) */
1268                 address = usb_pipeendpoint (urb->pipe);
1269                 if (usb_pipein (urb->pipe))
1270                         address |= USB_DIR_IN;
1271                 ep = find_endpoint(dum, address);
1272                 if (!ep) {
1273                         /* set_configuration() disagreement */
1274                         dev_dbg (dummy_dev(dum),
1275                                 "no ep configured for urb %p\n",
1276                                 urb);
1277                         maybe_set_status (urb, -EPROTO);
1278                         goto return_urb;
1279                 }
1280
1281                 if (ep->already_seen)
1282                         continue;
1283                 ep->already_seen = 1;
1284                 if (ep == &dum->ep [0] && urb->error_count) {
1285                         ep->setup_stage = 1;    /* a new urb */
1286                         urb->error_count = 0;
1287                 }
1288                 if (ep->halted && !ep->setup_stage) {
1289                         /* NOTE: must not be iso! */
1290                         dev_dbg (dummy_dev(dum), "ep %s halted, urb %p\n",
1291                                         ep->ep.name, urb);
1292                         maybe_set_status (urb, -EPIPE);
1293                         goto return_urb;
1294                 }
1295                 /* FIXME make sure both ends agree on maxpacket */
1296
1297                 /* handle control requests */
1298                 if (ep == &dum->ep [0] && ep->setup_stage) {
1299                         struct usb_ctrlrequest          setup;
1300                         int                             value = 1;
1301                         struct dummy_ep                 *ep2;
1302                         unsigned                        w_index;
1303                         unsigned                        w_value;
1304
1305                         setup = *(struct usb_ctrlrequest*) urb->setup_packet;
1306                         w_index = le16_to_cpu(setup.wIndex);
1307                         w_value = le16_to_cpu(setup.wValue);
1308                         if (le16_to_cpu(setup.wLength) !=
1309                                         urb->transfer_buffer_length) {
1310                                 maybe_set_status (urb, -EOVERFLOW);
1311                                 goto return_urb;
1312                         }
1313
1314                         /* paranoia, in case of stale queued data */
1315                         list_for_each_entry (req, &ep->queue, queue) {
1316                                 list_del_init (&req->queue);
1317                                 req->req.status = -EOVERFLOW;
1318                                 dev_dbg (udc_dev(dum), "stale req = %p\n",
1319                                                 req);
1320
1321                                 spin_unlock (&dum->lock);
1322                                 req->req.complete (&ep->ep, &req->req);
1323                                 spin_lock (&dum->lock);
1324                                 ep->already_seen = 0;
1325                                 goto restart;
1326                         }
1327
1328                         /* gadget driver never sees set_address or operations
1329                          * on standard feature flags.  some hardware doesn't
1330                          * even expose them.
1331                          */
1332                         ep->last_io = jiffies;
1333                         ep->setup_stage = 0;
1334                         ep->halted = 0;
1335                         switch (setup.bRequest) {
1336                         case USB_REQ_SET_ADDRESS:
1337                                 if (setup.bRequestType != Dev_Request)
1338                                         break;
1339                                 dum->address = w_value;
1340                                 maybe_set_status (urb, 0);
1341                                 dev_dbg (udc_dev(dum), "set_address = %d\n",
1342                                                 w_value);
1343                                 value = 0;
1344                                 break;
1345                         case USB_REQ_SET_FEATURE:
1346                                 if (setup.bRequestType == Dev_Request) {
1347                                         value = 0;
1348                                         switch (w_value) {
1349                                         case USB_DEVICE_REMOTE_WAKEUP:
1350                                                 break;
1351                                         case USB_DEVICE_B_HNP_ENABLE:
1352                                                 dum->gadget.b_hnp_enable = 1;
1353                                                 break;
1354                                         case USB_DEVICE_A_HNP_SUPPORT:
1355                                                 dum->gadget.a_hnp_support = 1;
1356                                                 break;
1357                                         case USB_DEVICE_A_ALT_HNP_SUPPORT:
1358                                                 dum->gadget.a_alt_hnp_support
1359                                                         = 1;
1360                                                 break;
1361                                         default:
1362                                                 value = -EOPNOTSUPP;
1363                                         }
1364                                         if (value == 0) {
1365                                                 dum->devstatus |=
1366                                                         (1 << w_value);
1367                                                 maybe_set_status (urb, 0);
1368                                         }
1369
1370                                 } else if (setup.bRequestType == Ep_Request) {
1371                                         // endpoint halt
1372                                         ep2 = find_endpoint (dum, w_index);
1373                                         if (!ep2) {
1374                                                 value = -EOPNOTSUPP;
1375                                                 break;
1376                                         }
1377                                         ep2->halted = 1;
1378                                         value = 0;
1379                                         maybe_set_status (urb, 0);
1380                                 }
1381                                 break;
1382                         case USB_REQ_CLEAR_FEATURE:
1383                                 if (setup.bRequestType == Dev_Request) {
1384                                         switch (w_value) {
1385                                         case USB_DEVICE_REMOTE_WAKEUP:
1386                                                 dum->devstatus &= ~(1 <<
1387                                                         USB_DEVICE_REMOTE_WAKEUP);
1388                                                 value = 0;
1389                                                 maybe_set_status (urb, 0);
1390                                                 break;
1391                                         default:
1392                                                 value = -EOPNOTSUPP;
1393                                                 break;
1394                                         }
1395                                 } else if (setup.bRequestType == Ep_Request) {
1396                                         // endpoint halt
1397                                         ep2 = find_endpoint (dum, w_index);
1398                                         if (!ep2) {
1399                                                 value = -EOPNOTSUPP;
1400                                                 break;
1401                                         }
1402                                         ep2->halted = 0;
1403                                         value = 0;
1404                                         maybe_set_status (urb, 0);
1405                                 }
1406                                 break;
1407                         case USB_REQ_GET_STATUS:
1408                                 if (setup.bRequestType == Dev_InRequest
1409                                                 || setup.bRequestType
1410                                                         == Intf_InRequest
1411                                                 || setup.bRequestType
1412                                                         == Ep_InRequest
1413                                                 ) {
1414                                         char *buf;
1415
1416                                         // device: remote wakeup, selfpowered
1417                                         // interface: nothing
1418                                         // endpoint: halt
1419                                         buf = (char *)urb->transfer_buffer;
1420                                         if (urb->transfer_buffer_length > 0) {
1421                                                 if (setup.bRequestType ==
1422                                                                 Ep_InRequest) {
1423         ep2 = find_endpoint (dum, w_index);
1424         if (!ep2) {
1425                 value = -EOPNOTSUPP;
1426                 break;
1427         }
1428         buf [0] = ep2->halted;
1429                                                 } else if (setup.bRequestType ==
1430                                                                 Dev_InRequest) {
1431                                                         buf [0] = (u8)
1432                                                                 dum->devstatus;
1433                                                 } else
1434                                                         buf [0] = 0;
1435                                         }
1436                                         if (urb->transfer_buffer_length > 1)
1437                                                 buf [1] = 0;
1438                                         urb->actual_length = min (2,
1439                                                 urb->transfer_buffer_length);
1440                                         value = 0;
1441                                         maybe_set_status (urb, 0);
1442                                 }
1443                                 break;
1444                         }
1445
1446                         /* gadget driver handles all other requests.  block
1447                          * until setup() returns; no reentrancy issues etc.
1448                          */
1449                         if (value > 0) {
1450                                 spin_unlock (&dum->lock);
1451                                 value = dum->driver->setup (&dum->gadget,
1452                                                 &setup);
1453                                 spin_lock (&dum->lock);
1454
1455                                 if (value >= 0) {
1456                                         /* no delays (max 64KB data stage) */
1457                                         limit = 64*1024;
1458                                         goto treat_control_like_bulk;
1459                                 }
1460                                 /* error, see below */
1461                         }
1462
1463                         if (value < 0) {
1464                                 if (value != -EOPNOTSUPP)
1465                                         dev_dbg (udc_dev(dum),
1466                                                 "setup --> %d\n",
1467                                                 value);
1468                                 maybe_set_status (urb, -EPIPE);
1469                                 urb->actual_length = 0;
1470                         }
1471
1472                         goto return_urb;
1473                 }
1474
1475                 /* non-control requests */
1476                 limit = total;
1477                 switch (usb_pipetype (urb->pipe)) {
1478                 case PIPE_ISOCHRONOUS:
1479                         /* FIXME is it urb->interval since the last xfer?
1480                          * use urb->iso_frame_desc[i].
1481                          * complete whether or not ep has requests queued.
1482                          * report random errors, to debug drivers.
1483                          */
1484                         limit = max (limit, periodic_bytes (dum, ep));
1485                         maybe_set_status (urb, -ENOSYS);
1486                         break;
1487
1488                 case PIPE_INTERRUPT:
1489                         /* FIXME is it urb->interval since the last xfer?
1490                          * this almost certainly polls too fast.
1491                          */
1492                         limit = max (limit, periodic_bytes (dum, ep));
1493                         /* FALLTHROUGH */
1494
1495                 // case PIPE_BULK:  case PIPE_CONTROL:
1496                 default:
1497                 treat_control_like_bulk:
1498                         ep->last_io = jiffies;
1499                         total = transfer (dum, urb, ep, limit);
1500                         break;
1501                 }
1502
1503                 /* incomplete transfer? */
1504                 if (urb->status == -EINPROGRESS)
1505                         continue;
1506
1507 return_urb:
1508                 urb->hcpriv = NULL;
1509                 list_del (&urbp->urbp_list);
1510                 kfree (urbp);
1511                 if (ep)
1512                         ep->already_seen = ep->setup_stage = 0;
1513
1514                 spin_unlock (&dum->lock);
1515                 usb_hcd_giveback_urb (dummy_to_hcd(dum), urb);
1516                 spin_lock (&dum->lock);
1517
1518                 goto restart;
1519         }
1520
1521         if (list_empty (&dum->urbp_list)) {
1522                 usb_put_dev (dum->udev);
1523                 dum->udev = NULL;
1524         } else if (dum->rh_state == DUMMY_RH_RUNNING) {
1525                 /* want a 1 msec delay here */
1526                 mod_timer (&dum->timer, jiffies + msecs_to_jiffies(1));
1527         }
1528
1529         spin_unlock_irqrestore (&dum->lock, flags);
1530 }
1531
1532 /*-------------------------------------------------------------------------*/
1533
1534 #define PORT_C_MASK \
1535         ((USB_PORT_STAT_C_CONNECTION \
1536         | USB_PORT_STAT_C_ENABLE \
1537         | USB_PORT_STAT_C_SUSPEND \
1538         | USB_PORT_STAT_C_OVERCURRENT \
1539         | USB_PORT_STAT_C_RESET) << 16)
1540
1541 static int dummy_hub_status (struct usb_hcd *hcd, char *buf)
1542 {
1543         struct dummy            *dum;
1544         unsigned long           flags;
1545         int                     retval = 0;
1546
1547         dum = hcd_to_dummy (hcd);
1548
1549         spin_lock_irqsave (&dum->lock, flags);
1550         if (!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags))
1551                 goto done;
1552
1553         if (dum->resuming && time_after_eq (jiffies, dum->re_timeout)) {
1554                 dum->port_status |= (USB_PORT_STAT_C_SUSPEND << 16);
1555                 dum->port_status &= ~USB_PORT_STAT_SUSPEND;
1556                 set_link_state (dum);
1557         }
1558
1559         if ((dum->port_status & PORT_C_MASK) != 0) {
1560                 *buf = (1 << 1);
1561                 dev_dbg (dummy_dev(dum), "port status 0x%08x has changes\n",
1562                                 dum->port_status);
1563                 retval = 1;
1564                 if (dum->rh_state == DUMMY_RH_SUSPENDED)
1565                         usb_hcd_resume_root_hub (hcd);
1566         }
1567 done:
1568         spin_unlock_irqrestore (&dum->lock, flags);
1569         return retval;
1570 }
1571
1572 static inline void
1573 hub_descriptor (struct usb_hub_descriptor *desc)
1574 {
1575         memset (desc, 0, sizeof *desc);
1576         desc->bDescriptorType = 0x29;
1577         desc->bDescLength = 9;
1578         desc->wHubCharacteristics = (__force __u16)
1579                         (__constant_cpu_to_le16 (0x0001));
1580         desc->bNbrPorts = 1;
1581         desc->bitmap [0] = 0xff;
1582         desc->bitmap [1] = 0xff;
1583 }
1584
1585 static int dummy_hub_control (
1586         struct usb_hcd  *hcd,
1587         u16             typeReq,
1588         u16             wValue,
1589         u16             wIndex,
1590         char            *buf,
1591         u16             wLength
1592 ) {
1593         struct dummy    *dum;
1594         int             retval = 0;
1595         unsigned long   flags;
1596
1597         if (!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags))
1598                 return -ETIMEDOUT;
1599
1600         dum = hcd_to_dummy (hcd);
1601         spin_lock_irqsave (&dum->lock, flags);
1602         switch (typeReq) {
1603         case ClearHubFeature:
1604                 break;
1605         case ClearPortFeature:
1606                 switch (wValue) {
1607                 case USB_PORT_FEAT_SUSPEND:
1608                         if (dum->port_status & USB_PORT_STAT_SUSPEND) {
1609                                 /* 20msec resume signaling */
1610                                 dum->resuming = 1;
1611                                 dum->re_timeout = jiffies +
1612                                                 msecs_to_jiffies(20);
1613                         }
1614                         break;
1615                 case USB_PORT_FEAT_POWER:
1616                         if (dum->port_status & USB_PORT_STAT_POWER)
1617                                 dev_dbg (dummy_dev(dum), "power-off\n");
1618                         /* FALLS THROUGH */
1619                 default:
1620                         dum->port_status &= ~(1 << wValue);
1621                         set_link_state (dum);
1622                 }
1623                 break;
1624         case GetHubDescriptor:
1625                 hub_descriptor ((struct usb_hub_descriptor *) buf);
1626                 break;
1627         case GetHubStatus:
1628                 *(__le32 *) buf = __constant_cpu_to_le32 (0);
1629                 break;
1630         case GetPortStatus:
1631                 if (wIndex != 1)
1632                         retval = -EPIPE;
1633
1634                 /* whoever resets or resumes must GetPortStatus to
1635                  * complete it!!
1636                  */
1637                 if (dum->resuming &&
1638                                 time_after_eq (jiffies, dum->re_timeout)) {
1639                         dum->port_status |= (USB_PORT_STAT_C_SUSPEND << 16);
1640                         dum->port_status &= ~USB_PORT_STAT_SUSPEND;
1641                 }
1642                 if ((dum->port_status & USB_PORT_STAT_RESET) != 0 &&
1643                                 time_after_eq (jiffies, dum->re_timeout)) {
1644                         dum->port_status |= (USB_PORT_STAT_C_RESET << 16);
1645                         dum->port_status &= ~USB_PORT_STAT_RESET;
1646                         if (dum->pullup) {
1647                                 dum->port_status |= USB_PORT_STAT_ENABLE;
1648                                 /* give it the best speed we agree on */
1649                                 dum->gadget.speed = dum->driver->speed;
1650                                 dum->gadget.ep0->maxpacket = 64;
1651                                 switch (dum->gadget.speed) {
1652                                 case USB_SPEED_HIGH:
1653                                         dum->port_status |=
1654                                                 USB_PORT_STAT_HIGH_SPEED;
1655                                         break;
1656                                 case USB_SPEED_LOW:
1657                                         dum->gadget.ep0->maxpacket = 8;
1658                                         dum->port_status |=
1659                                                 USB_PORT_STAT_LOW_SPEED;
1660                                         break;
1661                                 default:
1662                                         dum->gadget.speed = USB_SPEED_FULL;
1663                                         break;
1664                                 }
1665                         }
1666                 }
1667                 set_link_state (dum);
1668                 ((__le16 *) buf)[0] = cpu_to_le16 (dum->port_status);
1669                 ((__le16 *) buf)[1] = cpu_to_le16 (dum->port_status >> 16);
1670                 break;
1671         case SetHubFeature:
1672                 retval = -EPIPE;
1673                 break;
1674         case SetPortFeature:
1675                 switch (wValue) {
1676                 case USB_PORT_FEAT_SUSPEND:
1677                         if (dum->active) {
1678                                 dum->port_status |= USB_PORT_STAT_SUSPEND;
1679
1680                                 /* HNP would happen here; for now we
1681                                  * assume b_bus_req is always true.
1682                                  */
1683                                 set_link_state (dum);
1684                                 if (((1 << USB_DEVICE_B_HNP_ENABLE)
1685                                                 & dum->devstatus) != 0)
1686                                         dev_dbg (dummy_dev(dum),
1687                                                         "no HNP yet!\n");
1688                         }
1689                         break;
1690                 case USB_PORT_FEAT_POWER:
1691                         dum->port_status |= USB_PORT_STAT_POWER;
1692                         set_link_state (dum);
1693                         break;
1694                 case USB_PORT_FEAT_RESET:
1695                         /* if it's already enabled, disable */
1696                         dum->port_status &= ~(USB_PORT_STAT_ENABLE
1697                                         | USB_PORT_STAT_LOW_SPEED
1698                                         | USB_PORT_STAT_HIGH_SPEED);
1699                         dum->devstatus = 0;
1700                         /* 50msec reset signaling */
1701                         dum->re_timeout = jiffies + msecs_to_jiffies(50);
1702                         /* FALLS THROUGH */
1703                 default:
1704                         if ((dum->port_status & USB_PORT_STAT_POWER) != 0) {
1705                                 dum->port_status |= (1 << wValue);
1706                                 set_link_state (dum);
1707                         }
1708                 }
1709                 break;
1710
1711         default:
1712                 dev_dbg (dummy_dev(dum),
1713                         "hub control req%04x v%04x i%04x l%d\n",
1714                         typeReq, wValue, wIndex, wLength);
1715
1716                 /* "protocol stall" on error */
1717                 retval = -EPIPE;
1718         }
1719         spin_unlock_irqrestore (&dum->lock, flags);
1720
1721         if ((dum->port_status & PORT_C_MASK) != 0)
1722                 usb_hcd_poll_rh_status (hcd);
1723         return retval;
1724 }
1725
1726 static int dummy_bus_suspend (struct usb_hcd *hcd)
1727 {
1728         struct dummy *dum = hcd_to_dummy (hcd);
1729
1730         dev_dbg (&hcd->self.root_hub->dev, "%s\n", __FUNCTION__);
1731
1732         spin_lock_irq (&dum->lock);
1733         dum->rh_state = DUMMY_RH_SUSPENDED;
1734         set_link_state (dum);
1735         hcd->state = HC_STATE_SUSPENDED;
1736         spin_unlock_irq (&dum->lock);
1737         return 0;
1738 }
1739
1740 static int dummy_bus_resume (struct usb_hcd *hcd)
1741 {
1742         struct dummy *dum = hcd_to_dummy (hcd);
1743         int rc = 0;
1744
1745         dev_dbg (&hcd->self.root_hub->dev, "%s\n", __FUNCTION__);
1746
1747         spin_lock_irq (&dum->lock);
1748         if (!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags)) {
1749                 rc = -ESHUTDOWN;
1750         } else {
1751                 dum->rh_state = DUMMY_RH_RUNNING;
1752                 set_link_state (dum);
1753                 if (!list_empty(&dum->urbp_list))
1754                         mod_timer (&dum->timer, jiffies);
1755                 hcd->state = HC_STATE_RUNNING;
1756         }
1757         spin_unlock_irq (&dum->lock);
1758         return rc;
1759 }
1760
1761 /*-------------------------------------------------------------------------*/
1762
1763 static inline ssize_t
1764 show_urb (char *buf, size_t size, struct urb *urb)
1765 {
1766         int ep = usb_pipeendpoint (urb->pipe);
1767
1768         return snprintf (buf, size,
1769                 "urb/%p %s ep%d%s%s len %d/%d\n",
1770                 urb,
1771                 ({ char *s;
1772                  switch (urb->dev->speed) {
1773                  case USB_SPEED_LOW:    s = "ls"; break;
1774                  case USB_SPEED_FULL:   s = "fs"; break;
1775                  case USB_SPEED_HIGH:   s = "hs"; break;
1776                  default:               s = "?"; break;
1777                  }; s; }),
1778                 ep, ep ? (usb_pipein (urb->pipe) ? "in" : "out") : "",
1779                 ({ char *s; \
1780                  switch (usb_pipetype (urb->pipe)) { \
1781                  case PIPE_CONTROL:     s = ""; break; \
1782                  case PIPE_BULK:        s = "-bulk"; break; \
1783                  case PIPE_INTERRUPT:   s = "-int"; break; \
1784                  default:               s = "-iso"; break; \
1785                 }; s;}),
1786                 urb->actual_length, urb->transfer_buffer_length);
1787 }
1788
1789 static ssize_t
1790 show_urbs (struct device *dev, struct device_attribute *attr, char *buf)
1791 {
1792         struct usb_hcd          *hcd = dev_get_drvdata (dev);
1793         struct dummy            *dum = hcd_to_dummy (hcd);
1794         struct urbp             *urbp;
1795         size_t                  size = 0;
1796         unsigned long           flags;
1797
1798         spin_lock_irqsave (&dum->lock, flags);
1799         list_for_each_entry (urbp, &dum->urbp_list, urbp_list) {
1800                 size_t          temp;
1801
1802                 temp = show_urb (buf, PAGE_SIZE - size, urbp->urb);
1803                 buf += temp;
1804                 size += temp;
1805         }
1806         spin_unlock_irqrestore (&dum->lock, flags);
1807
1808         return size;
1809 }
1810 static DEVICE_ATTR (urbs, S_IRUGO, show_urbs, NULL);
1811
1812 static int dummy_start (struct usb_hcd *hcd)
1813 {
1814         struct dummy            *dum;
1815
1816         dum = hcd_to_dummy (hcd);
1817
1818         /*
1819          * MASTER side init ... we emulate a root hub that'll only ever
1820          * talk to one device (the slave side).  Also appears in sysfs,
1821          * just like more familiar pci-based HCDs.
1822          */
1823         spin_lock_init (&dum->lock);
1824         init_timer (&dum->timer);
1825         dum->timer.function = dummy_timer;
1826         dum->timer.data = (unsigned long) dum;
1827         dum->rh_state = DUMMY_RH_RUNNING;
1828
1829         INIT_LIST_HEAD (&dum->urbp_list);
1830
1831         /* only show a low-power port: just 8mA */
1832         hcd->power_budget = 8;
1833         hcd->state = HC_STATE_RUNNING;
1834         hcd->uses_new_polling = 1;
1835
1836 #ifdef CONFIG_USB_OTG
1837         hcd->self.otg_port = 1;
1838 #endif
1839
1840         /* FIXME 'urbs' should be a per-device thing, maybe in usbcore */
1841         return device_create_file (dummy_dev(dum), &dev_attr_urbs);
1842 }
1843
1844 static void dummy_stop (struct usb_hcd *hcd)
1845 {
1846         struct dummy            *dum;
1847
1848         dum = hcd_to_dummy (hcd);
1849
1850         device_remove_file (dummy_dev(dum), &dev_attr_urbs);
1851         usb_gadget_unregister_driver (dum->driver);
1852         dev_info (dummy_dev(dum), "stopped\n");
1853 }
1854
1855 /*-------------------------------------------------------------------------*/
1856
1857 static int dummy_h_get_frame (struct usb_hcd *hcd)
1858 {
1859         return dummy_g_get_frame (NULL);
1860 }
1861
1862 static const struct hc_driver dummy_hcd = {
1863         .description =          (char *) driver_name,
1864         .product_desc =         "Dummy host controller",
1865         .hcd_priv_size =        sizeof(struct dummy),
1866
1867         .flags =                HCD_USB2,
1868
1869         .start =                dummy_start,
1870         .stop =                 dummy_stop,
1871
1872         .urb_enqueue =          dummy_urb_enqueue,
1873         .urb_dequeue =          dummy_urb_dequeue,
1874
1875         .get_frame_number =     dummy_h_get_frame,
1876
1877         .hub_status_data =      dummy_hub_status,
1878         .hub_control =          dummy_hub_control,
1879         .bus_suspend =          dummy_bus_suspend,
1880         .bus_resume =           dummy_bus_resume,
1881 };
1882
1883 static int dummy_hcd_probe(struct platform_device *pdev)
1884 {
1885         struct usb_hcd          *hcd;
1886         int                     retval;
1887
1888         dev_info(&pdev->dev, "%s, driver " DRIVER_VERSION "\n", driver_desc);
1889
1890         hcd = usb_create_hcd(&dummy_hcd, &pdev->dev, pdev->dev.bus_id);
1891         if (!hcd)
1892                 return -ENOMEM;
1893         the_controller = hcd_to_dummy (hcd);
1894
1895         retval = usb_add_hcd(hcd, 0, 0);
1896         if (retval != 0) {
1897                 usb_put_hcd (hcd);
1898                 the_controller = NULL;
1899         }
1900         return retval;
1901 }
1902
1903 static int dummy_hcd_remove (struct platform_device *pdev)
1904 {
1905         struct usb_hcd          *hcd;
1906
1907         hcd = platform_get_drvdata (pdev);
1908         usb_remove_hcd (hcd);
1909         usb_put_hcd (hcd);
1910         the_controller = NULL;
1911         return 0;
1912 }
1913
1914 static int dummy_hcd_suspend (struct platform_device *pdev, pm_message_t state)
1915 {
1916         struct usb_hcd          *hcd;
1917         struct dummy            *dum;
1918         int                     rc = 0;
1919
1920         dev_dbg (&pdev->dev, "%s\n", __FUNCTION__);
1921
1922         hcd = platform_get_drvdata (pdev);
1923         dum = hcd_to_dummy (hcd);
1924         if (dum->rh_state == DUMMY_RH_RUNNING) {
1925                 dev_warn(&pdev->dev, "Root hub isn't suspended!\n");
1926                 rc = -EBUSY;
1927         } else
1928                 clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
1929         return rc;
1930 }
1931
1932 static int dummy_hcd_resume (struct platform_device *pdev)
1933 {
1934         struct usb_hcd          *hcd;
1935
1936         dev_dbg (&pdev->dev, "%s\n", __FUNCTION__);
1937
1938         hcd = platform_get_drvdata (pdev);
1939         set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
1940         usb_hcd_poll_rh_status (hcd);
1941         return 0;
1942 }
1943
1944 static struct platform_driver dummy_hcd_driver = {
1945         .probe          = dummy_hcd_probe,
1946         .remove         = dummy_hcd_remove,
1947         .suspend        = dummy_hcd_suspend,
1948         .resume         = dummy_hcd_resume,
1949         .driver         = {
1950                 .name   = (char *) driver_name,
1951                 .owner  = THIS_MODULE,
1952         },
1953 };
1954
1955 /*-------------------------------------------------------------------------*/
1956
1957 /* These don't need to do anything because the pdev structures are
1958  * statically allocated. */
1959 static void
1960 dummy_udc_release (struct device *dev) {}
1961
1962 static void
1963 dummy_hcd_release (struct device *dev) {}
1964
1965 static struct platform_device           the_udc_pdev = {
1966         .name           = (char *) gadget_name,
1967         .id             = -1,
1968         .dev            = {
1969                 .release        = dummy_udc_release,
1970         },
1971 };
1972
1973 static struct platform_device           the_hcd_pdev = {
1974         .name           = (char *) driver_name,
1975         .id             = -1,
1976         .dev            = {
1977                 .release        = dummy_hcd_release,
1978         },
1979 };
1980
1981 static int __init init (void)
1982 {
1983         int     retval;
1984
1985         if (usb_disabled ())
1986                 return -ENODEV;
1987
1988         retval = platform_driver_register (&dummy_hcd_driver);
1989         if (retval < 0)
1990                 return retval;
1991
1992         retval = platform_driver_register (&dummy_udc_driver);
1993         if (retval < 0)
1994                 goto err_register_udc_driver;
1995
1996         retval = platform_device_register (&the_hcd_pdev);
1997         if (retval < 0)
1998                 goto err_register_hcd;
1999
2000         retval = platform_device_register (&the_udc_pdev);
2001         if (retval < 0)
2002                 goto err_register_udc;
2003         return retval;
2004
2005 err_register_udc:
2006         platform_device_unregister (&the_hcd_pdev);
2007 err_register_hcd:
2008         platform_driver_unregister (&dummy_udc_driver);
2009 err_register_udc_driver:
2010         platform_driver_unregister (&dummy_hcd_driver);
2011         return retval;
2012 }
2013 module_init (init);
2014
2015 static void __exit cleanup (void)
2016 {
2017         platform_device_unregister (&the_udc_pdev);
2018         platform_device_unregister (&the_hcd_pdev);
2019         platform_driver_unregister (&dummy_udc_driver);
2020         platform_driver_unregister (&dummy_hcd_driver);
2021 }
2022 module_exit (cleanup);