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 #define DEBUG
  38
  39 #include <linux/config.h>
  40 #include <linux/module.h>
  41 #include <linux/kernel.h>
  42 #include <linux/delay.h>
  43 #include <linux/ioport.h>
  44 #include <linux/sched.h>
  45 #include <linux/slab.h>
  46 #include <linux/smp_lock.h>
  47 #include <linux/errno.h>
  48 #include <linux/init.h>
  49 #include <linux/timer.h>
  50 #include <linux/list.h>
  51 #include <linux/interrupt.h>
  52 #include <linux/version.h>
  53 #include <linux/platform_device.h>
  54 #include <linux/usb.h>
  55 #include <linux/usb_gadget.h>
  56
  57 #include <asm/byteorder.h>
  58 #include <asm/io.h>
  59 #include <asm/irq.h>
  60 #include <asm/system.h>
  61 #include <asm/unaligned.h>
  62
  63
  64 #include "../core/hcd.h"
  65
  66
  67 #define DRIVER_DESC     "USB Host+Gadget Emulator"
  68 #define DRIVER_VERSION  "02 May 2005"
  69
  70 static const char       driver_name [] = "dummy_hcd";
  71 static const char       driver_desc [] = "USB Host+Gadget Emulator";
  72
  73 static const char       gadget_name [] = "dummy_udc";
  74
  75 MODULE_DESCRIPTION (DRIVER_DESC);
  76 MODULE_AUTHOR ("David Brownell");
  77 MODULE_LICENSE ("GPL");
  78
  79 /*-------------------------------------------------------------------------*/
  80
  81 /* gadget side driver data structres */
  82 struct dummy_ep {
  83         struct list_head                queue;
  84         unsigned long                   last_io;        /* jiffies timestamp */
  85         struct usb_gadget               *gadget;
  86         const struct usb_endpoint_descriptor *desc;
  87         struct usb_ep                   ep;
  88         unsigned                        halted : 1;
  89         unsigned                        already_seen : 1;
  90         unsigned                        setup_stage : 1;
  91 };
  92
  93 struct dummy_request {
  94         struct list_head                queue;          /* ep's requests */
  95         struct usb_request              req;
  96 };
  97
  98 static inline struct dummy_ep *usb_ep_to_dummy_ep (struct usb_ep *_ep)
  99 {
 100         return container_of (_ep, struct dummy_ep, ep);
 101 }
 102
 103 static inline struct dummy_request *usb_request_to_dummy_request
 104                 (struct usb_request *_req)
 105 {
 106         return container_of (_req, struct dummy_request, req);
 107 }
 108
 109 /*-------------------------------------------------------------------------*/
 110
 111 /*
 112  * Every device has ep0 for control requests, plus up to 30 more endpoints,
 113  * in one of two types:
 114  *
 115  *   - Configurable:  direction (in/out), type (bulk, iso, etc), and endpoint
 116  *     number can be changed.  Names like "ep-a" are used for this type.
 117  *
 118  *   - Fixed Function:  in other cases.  some characteristics may be mutable;
 119  *     that'd be hardware-specific.  Names like "ep12out-bulk" are used.
 120  *
 121  * Gadget drivers are responsible for not setting up conflicting endpoint
 122  * configurations, illegal or unsupported packet lengths, and so on.
 123  */
 124
 125 static const char ep0name [] = "ep0";
 126
 127 static const char *const ep_name [] = {
 128         ep0name,                                /* everyone has ep0 */
 129
 130         /* act like a net2280: high speed, six configurable endpoints */
 131         "ep-a", "ep-b", "ep-c", "ep-d", "ep-e", "ep-f",
 132
 133         /* or like pxa250: fifteen fixed function endpoints */
 134         "ep1in-bulk", "ep2out-bulk", "ep3in-iso", "ep4out-iso", "ep5in-int",
 135         "ep6in-bulk", "ep7out-bulk", "ep8in-iso", "ep9out-iso", "ep10in-int",
 136         "ep11in-bulk", "ep12out-bulk", "ep13in-iso", "ep14out-iso",
 137                 "ep15in-int",
 138
 139         /* or like sa1100: two fixed function endpoints */
 140         "ep1out-bulk", "ep2in-bulk",
 141 };
 142 #define DUMMY_ENDPOINTS (sizeof(ep_name)/sizeof(char *))
 143
 144 /*-------------------------------------------------------------------------*/
 145
 146 #define FIFO_SIZE               64
 147
 148 struct urbp {
 149         struct urb              *urb;
 150         struct list_head        urbp_list;
 151 };
 152
 153
 154 enum dummy_rh_state {
 155         DUMMY_RH_RESET,
 156         DUMMY_RH_SUSPENDED,
 157         DUMMY_RH_RUNNING
 158 };
 159
 160 struct dummy {
 161         spinlock_t                      lock;
 162
 163         /*
 164          * SLAVE/GADGET side support
 165          */
 166         struct dummy_ep                 ep [DUMMY_ENDPOINTS];
 167         int                             address;
 168         struct usb_gadget               gadget;
 169         struct usb_gadget_driver        *driver;
 170         struct dummy_request            fifo_req;
 171         u8                              fifo_buf [FIFO_SIZE];
 172         u16                             devstatus;
 173         unsigned                        udc_suspended:1;
 174         unsigned                        pullup:1;
 175         unsigned                        active:1;
 176         unsigned                        old_active:1;
 177
 178         /*
 179          * MASTER/HOST side support
 180          */
 181         enum dummy_rh_state             rh_state;
 182         struct timer_list               timer;
 183         u32                             port_status;
 184         u32                             old_status;
 185         unsigned                        resuming:1;
 186         unsigned long                   re_timeout;
 187
 188         struct usb_device               *udev;
 189         struct list_head                urbp_list;
 190 };
 191
 192 static inline struct dummy *hcd_to_dummy (struct usb_hcd *hcd)
 193 {
 194         return (struct dummy *) (hcd->hcd_priv);
 195 }
 196
 197 static inline struct usb_hcd *dummy_to_hcd (struct dummy *dum)
 198 {
 199         return container_of((void *) dum, struct usb_hcd, hcd_priv);
 200 }
 201
 202 static inline struct device *dummy_dev (struct dummy *dum)
 203 {
 204         return dummy_to_hcd(dum)->self.controller;
 205 }
 206
 207 static inline struct device *udc_dev (struct dummy *dum)
 208 {
 209         return dum->gadget.dev.parent;
 210 }
 211
 212 static inline struct dummy *ep_to_dummy (struct dummy_ep *ep)
 213 {
 214         return container_of (ep->gadget, struct dummy, gadget);
 215 }
 216
 217 static inline struct dummy *gadget_to_dummy (struct usb_gadget *gadget)
 218 {
 219         return container_of (gadget, struct dummy, gadget);
 220 }
 221
 222 static inline struct dummy *gadget_dev_to_dummy (struct device *dev)
 223 {
 224         return container_of (dev, struct dummy, gadget.dev);
 225 }
 226
 227 static struct dummy                     *the_controller;
 228
 229 /*-------------------------------------------------------------------------*/
 230
 231 /* SLAVE/GADGET SIDE UTILITY ROUTINES */
 232
 233 /* called with spinlock held */
 234 static void nuke (struct dummy *dum, struct dummy_ep *ep)
 235 {
 236         while (!list_empty (&ep->queue)) {
 237                 struct dummy_request    *req;
 238
 239                 req = list_entry (ep->queue.next, struct dummy_request, queue);
 240                 list_del_init (&req->queue);
 241                 req->req.status = -ESHUTDOWN;
 242
 243                 spin_unlock (&dum->lock);
 244                 req->req.complete (&ep->ep, &req->req);
 245                 spin_lock (&dum->lock);
 246         }
 247 }
 248
 249 /* caller must hold lock */
 250 static void
 251 stop_activity (struct dummy *dum)
 252 {
 253         struct dummy_ep *ep;
 254
 255         /* prevent any more requests */
 256         dum->address = 0;
 257
 258         /* The timer is left running so that outstanding URBs can fail */
 259
 260         /* nuke any pending requests first, so driver i/o is quiesced */
 261         list_for_each_entry (ep, &dum->gadget.ep_list, ep.ep_list)
 262                 nuke (dum, ep);
 263
 264         /* driver now does any non-usb quiescing necessary */
 265 }
 266
 267 /* caller must hold lock */
 268 static void
 269 set_link_state (struct dummy *dum)
 270 {
 271         dum->active = 0;
 272         if ((dum->port_status & USB_PORT_STAT_POWER) == 0)
 273                 dum->port_status = 0;
 274
 275         /* UDC suspend must cause a disconnect */
 276         else if (!dum->pullup || dum->udc_suspended) {
 277                 dum->port_status &= ~(USB_PORT_STAT_CONNECTION |
 278                                         USB_PORT_STAT_ENABLE |
 279                                         USB_PORT_STAT_LOW_SPEED |
 280                                         USB_PORT_STAT_HIGH_SPEED |
 281                                         USB_PORT_STAT_SUSPEND);
 282                 if ((dum->old_status & USB_PORT_STAT_CONNECTION) != 0)
 283                         dum->port_status |= (USB_PORT_STAT_C_CONNECTION << 16);
 284         } else {
 285                 dum->port_status |= USB_PORT_STAT_CONNECTION;
 286                 if ((dum->old_status & USB_PORT_STAT_CONNECTION) == 0)
 287                         dum->port_status |= (USB_PORT_STAT_C_CONNECTION << 16);
 288                 if ((dum->port_status & USB_PORT_STAT_ENABLE) == 0)
 289                         dum->port_status &= ~USB_PORT_STAT_SUSPEND;
 290                 else if ((dum->port_status & USB_PORT_STAT_SUSPEND) == 0 &&
 291                                 dum->rh_state != DUMMY_RH_SUSPENDED)
 292                         dum->active = 1;
 293         }
 294
 295         if ((dum->port_status & USB_PORT_STAT_ENABLE) == 0 || dum->active)
 296                 dum->resuming = 0;
 297
 298         if ((dum->port_status & USB_PORT_STAT_CONNECTION) == 0 ||
 299                         (dum->port_status & USB_PORT_STAT_RESET) != 0) {
 300                 if ((dum->old_status & USB_PORT_STAT_CONNECTION) != 0 &&
 301                                 (dum->old_status & USB_PORT_STAT_RESET) == 0 &&
 302                                 dum->driver) {
 303                         stop_activity (dum);
 304                         spin_unlock (&dum->lock);
 305                         dum->driver->disconnect (&dum->gadget);
 306                         spin_lock (&dum->lock);
 307                 }
 308         } else if (dum->active != dum->old_active) {
 309                 if (dum->old_active && dum->driver->suspend) {
 310                         spin_unlock (&dum->lock);
 311                         dum->driver->suspend (&dum->gadget);
 312                         spin_lock (&dum->lock);
 313                 } else if (!dum->old_active && dum->driver->resume) {
 314                         spin_unlock (&dum->lock);
 315                         dum->driver->resume (&dum->gadget);
 316                         spin_lock (&dum->lock);
 317                 }
 318         }
 319
 320         dum->old_status = dum->port_status;
 321         dum->old_active = dum->active;
 322 }
 323
 324 /*-------------------------------------------------------------------------*/
 325
 326 /* SLAVE/GADGET SIDE DRIVER
 327  *
 328  * This only tracks gadget state.  All the work is done when the host
 329  * side tries some (emulated) i/o operation.  Real device controller
 330  * drivers would do real i/o using dma, fifos, irqs, timers, etc.
 331  */
 332
 333 #define is_enabled(dum) \
 334         (dum->port_status & USB_PORT_STAT_ENABLE)
 335
 336 static int
 337 dummy_enable (struct usb_ep *_ep, const struct usb_endpoint_descriptor *desc)
 338 {
 339         struct dummy            *dum;
 340         struct dummy_ep         *ep;
 341         unsigned                max;
 342         int                     retval;
 343
 344         ep = usb_ep_to_dummy_ep (_ep);
 345         if (!_ep || !desc || ep->desc || _ep->name == ep0name
 346                         || desc->bDescriptorType != USB_DT_ENDPOINT)
 347                 return -EINVAL;
 348         dum = ep_to_dummy (ep);
 349         if (!dum->driver || !is_enabled (dum))
 350                 return -ESHUTDOWN;
 351         max = le16_to_cpu(desc->wMaxPacketSize) & 0x3ff;
 352
 353         /* drivers must not request bad settings, since lower levels
 354          * (hardware or its drivers) may not check.  some endpoints
 355          * can't do iso, many have maxpacket limitations, etc.
 356          *
 357          * since this "hardware" driver is here to help debugging, we
 358          * have some extra sanity checks.  (there could be more though,
 359          * especially for "ep9out" style fixed function ones.)
 360          */
 361         retval = -EINVAL;
 362         switch (desc->bmAttributes & 0x03) {
 363         case USB_ENDPOINT_XFER_BULK:
 364                 if (strstr (ep->ep.name, "-iso")
 365                                 || strstr (ep->ep.name, "-int")) {
 366                         goto done;
 367                 }
 368                 switch (dum->gadget.speed) {
 369                 case USB_SPEED_HIGH:
 370                         if (max == 512)
 371                                 break;
 372                         /* conserve return statements */
 373                 default:
 374                         switch (max) {
 375                         case 8: case 16: case 32: case 64:
 376                                 /* we'll fake any legal size */
 377                                 break;
 378                         default:
 379                 case USB_SPEED_LOW:
 380                                 goto done;
 381                         }
 382                 }
 383                 break;
 384         case USB_ENDPOINT_XFER_INT:
 385                 if (strstr (ep->ep.name, "-iso")) /* bulk is ok */
 386                         goto done;
 387                 /* real hardware might not handle all packet sizes */
 388                 switch (dum->gadget.speed) {
 389                 case USB_SPEED_HIGH:
 390                         if (max <= 1024)
 391                                 break;
 392                         /* save a return statement */
 393                 case USB_SPEED_FULL:
 394                         if (max <= 64)
 395                                 break;
 396                         /* save a return statement */
 397                 default:
 398                         if (max <= 8)
 399                                 break;
 400                         goto done;
 401                 }
 402                 break;
 403         case USB_ENDPOINT_XFER_ISOC:
 404                 if (strstr (ep->ep.name, "-bulk")
 405                                 || strstr (ep->ep.name, "-int"))
 406                         goto done;
 407                 /* real hardware might not handle all packet sizes */
 408                 switch (dum->gadget.speed) {
 409                 case USB_SPEED_HIGH:
 410                         if (max <= 1024)
 411                                 break;
 412                         /* save a return statement */
 413                 case USB_SPEED_FULL:
 414                         if (max <= 1023)
 415                                 break;
 416                         /* save a return statement */
 417                 default:
 418                         goto done;
 419                 }
 420                 break;
 421         default:
 422                 /* few chips support control except on ep0 */
 423                 goto done;
 424         }
 425
 426         _ep->maxpacket = max;
 427         ep->desc = desc;
 428
 429         dev_dbg (udc_dev(dum), "enabled %s (ep%d%s-%s) maxpacket %d\n",
 430                 _ep->name,
 431                 desc->bEndpointAddress & 0x0f,
 432                 (desc->bEndpointAddress & USB_DIR_IN) ? "in" : "out",
 433                 ({ char *val;
 434                  switch (desc->bmAttributes & 0x03) {
 435                  case USB_ENDPOINT_XFER_BULK: val = "bulk"; break;
 436                  case USB_ENDPOINT_XFER_ISOC: val = "iso"; break;
 437                  case USB_ENDPOINT_XFER_INT: val = "intr"; break;
 438                  default: val = "ctrl"; break;
 439                  }; val; }),
 440                 max);
 441
 442         /* at this point real hardware should be NAKing transfers
 443          * to that endpoint, until a buffer is queued to it.
 444          */
 445         retval = 0;
 446 done:
 447         return retval;
 448 }
 449
 450 static int dummy_disable (struct usb_ep *_ep)
 451 {
 452         struct dummy_ep         *ep;
 453         struct dummy            *dum;
 454         unsigned long           flags;
 455         int                     retval;
 456
 457         ep = usb_ep_to_dummy_ep (_ep);
 458         if (!_ep || !ep->desc || _ep->name == ep0name)
 459                 return -EINVAL;
 460         dum = ep_to_dummy (ep);
 461
 462         spin_lock_irqsave (&dum->lock, flags);
 463         ep->desc = NULL;
 464         retval = 0;
 465         nuke (dum, ep);
 466         spin_unlock_irqrestore (&dum->lock, flags);
 467
 468         dev_dbg (udc_dev(dum), "disabled %s\n", _ep->name);
 469         return retval;
 470 }
 471
 472 static struct usb_request *
 473 dummy_alloc_request (struct usb_ep *_ep, gfp_t mem_flags)
 474 {
 475         struct dummy_ep         *ep;
 476         struct dummy_request    *req;
 477
 478         if (!_ep)
 479                 return NULL;
 480         ep = usb_ep_to_dummy_ep (_ep);
 481
 482         req = kmalloc (sizeof *req, mem_flags);
 483         if (!req)
 484                 return NULL;
 485         memset (req, 0, sizeof *req);
 486         INIT_LIST_HEAD (&req->queue);
 487         return &req->req;
 488 }
 489
 490 static void
 491 dummy_free_request (struct usb_ep *_ep, struct usb_request *_req)
 492 {
 493         struct dummy_ep         *ep;
 494         struct dummy_request    *req;
 495
 496         ep = usb_ep_to_dummy_ep (_ep);
 497         if (!ep || !_req || (!ep->desc && _ep->name != ep0name))
 498                 return;
 499
 500         req = usb_request_to_dummy_request (_req);
 501         WARN_ON (!list_empty (&req->queue));
 502         kfree (req);
 503 }
 504
 505 static void *
 506 dummy_alloc_buffer (
 507         struct usb_ep *_ep,
 508         unsigned bytes,
 509         dma_addr_t *dma,
 510         gfp_t mem_flags
 511 ) {
 512         char                    *retval;
 513         struct dummy_ep         *ep;
 514         struct dummy            *dum;
 515
 516         ep = usb_ep_to_dummy_ep (_ep);
 517         dum = ep_to_dummy (ep);
 518
 519         if (!dum->driver)
 520                 return NULL;
 521         retval = kmalloc (bytes, mem_flags);
 522         *dma = (dma_addr_t) retval;
 523         return retval;
 524 }
 525
 526 static void
 527 dummy_free_buffer (
 528         struct usb_ep *_ep,
 529         void *buf,
 530         dma_addr_t dma,
 531         unsigned bytes
 532 ) {
 533         if (bytes)
 534                 kfree (buf);
 535 }
 536
 537 static void
 538 fifo_complete (struct usb_ep *ep, struct usb_request *req)
 539 {
 540 }
 541
 542 static int
 543 dummy_queue (struct usb_ep *_ep, struct usb_request *_req,
 544                 gfp_t mem_flags)
 545 {
 546         struct dummy_ep         *ep;
 547         struct dummy_request    *req;
 548         struct dummy            *dum;
 549         unsigned long           flags;
 550
 551         req = usb_request_to_dummy_request (_req);
 552         if (!_req || !list_empty (&req->queue) || !_req->complete)
 553                 return -EINVAL;
 554
 555         ep = usb_ep_to_dummy_ep (_ep);
 556         if (!_ep || (!ep->desc && _ep->name != ep0name))
 557                 return -EINVAL;
 558
 559         dum = ep_to_dummy (ep);
 560         if (!dum->driver || !is_enabled (dum))
 561                 return -ESHUTDOWN;
 562
 563 #if 0
 564         dev_dbg (udc_dev(dum), "ep %p queue req %p to %s, len %d buf %p\n",
 565                         ep, _req, _ep->name, _req->length, _req->buf);
 566 #endif
 567
 568         _req->status = -EINPROGRESS;
 569         _req->actual = 0;
 570         spin_lock_irqsave (&dum->lock, flags);
 571
 572         /* implement an emulated single-request FIFO */
 573         if (ep->desc && (ep->desc->bEndpointAddress & USB_DIR_IN) &&
 574                         list_empty (&dum->fifo_req.queue) &&
 575                         list_empty (&ep->queue) &&
 576                         _req->length <= FIFO_SIZE) {
 577                 req = &dum->fifo_req;
 578                 req->req = *_req;
 579                 req->req.buf = dum->fifo_buf;
 580                 memcpy (dum->fifo_buf, _req->buf, _req->length);
 581                 req->req.context = dum;
 582                 req->req.complete = fifo_complete;
 583
 584                 spin_unlock (&dum->lock);
 585                 _req->actual = _req->length;
 586                 _req->status = 0;
 587                 _req->complete (_ep, _req);
 588                 spin_lock (&dum->lock);
 589         }
 590         list_add_tail (&req->queue, &ep->queue);
 591         spin_unlock_irqrestore (&dum->lock, flags);
 592
 593         /* real hardware would likely enable transfers here, in case
 594          * it'd been left NAKing.
 595          */
 596         return 0;
 597 }
 598
 599 static int dummy_dequeue (struct usb_ep *_ep, struct usb_request *_req)
 600 {
 601         struct dummy_ep         *ep;
 602         struct dummy            *dum;
 603         int                     retval = -EINVAL;
 604         unsigned long           flags;
 605         struct dummy_request    *req = NULL;
 606
 607         if (!_ep || !_req)
 608                 return retval;
 609         ep = usb_ep_to_dummy_ep (_ep);
 610         dum = ep_to_dummy (ep);
 611
 612         if (!dum->driver)
 613                 return -ESHUTDOWN;
 614
 615         spin_lock_irqsave (&dum->lock, flags);
 616         list_for_each_entry (req, &ep->queue, queue) {
 617                 if (&req->req == _req) {
 618                         list_del_init (&req->queue);
 619                         _req->status = -ECONNRESET;
 620                         retval = 0;
 621                         break;
 622                 }
 623         }
 624         spin_unlock_irqrestore (&dum->lock, flags);
 625
 626         if (retval == 0) {
 627                 dev_dbg (udc_dev(dum),
 628                                 "dequeued req %p from %s, len %d buf %p\n",
 629                                 req, _ep->name, _req->length, _req->buf);
 630                 _req->complete (_ep, _req);
 631         }
 632         return retval;
 633 }
 634
 635 static int
 636 dummy_set_halt (struct usb_ep *_ep, int value)
 637 {
 638         struct dummy_ep         *ep;
 639         struct dummy            *dum;
 640
 641         if (!_ep)
 642                 return -EINVAL;
 643         ep = usb_ep_to_dummy_ep (_ep);
 644         dum = ep_to_dummy (ep);
 645         if (!dum->driver)
 646                 return -ESHUTDOWN;
 647         if (!value)
 648                 ep->halted = 0;
 649         else if (ep->desc && (ep->desc->bEndpointAddress & USB_DIR_IN) &&
 650                         !list_empty (&ep->queue))
 651                 return -EAGAIN;
 652         else
 653                 ep->halted = 1;
 654         /* FIXME clear emulated data toggle too */
 655         return 0;
 656 }
 657
 658 static const struct usb_ep_ops dummy_ep_ops = {
 659         .enable         = dummy_enable,
 660         .disable        = dummy_disable,
 661
 662         .alloc_request  = dummy_alloc_request,
 663         .free_request   = dummy_free_request,
 664
 665         .alloc_buffer   = dummy_alloc_buffer,
 666         .free_buffer    = dummy_free_buffer,
 667         /* map, unmap, ... eventually hook the "generic" dma calls */
 668
 669         .queue          = dummy_queue,
 670         .dequeue        = dummy_dequeue,
 671
 672         .set_halt       = dummy_set_halt,
 673 };
 674
 675 /*-------------------------------------------------------------------------*/
 676
 677 /* there are both host and device side versions of this call ... */
 678 static int dummy_g_get_frame (struct usb_gadget *_gadget)
 679 {
 680         struct timeval  tv;
 681
 682         do_gettimeofday (&tv);
 683         return tv.tv_usec / 1000;
 684 }
 685
 686 static int dummy_wakeup (struct usb_gadget *_gadget)
 687 {
 688         struct dummy    *dum;
 689
 690         dum = gadget_to_dummy (_gadget);
 691         if (!(dum->devstatus &  ( (1 << USB_DEVICE_B_HNP_ENABLE)
 692                                 | (1 << USB_DEVICE_REMOTE_WAKEUP))))
 693                 return -EINVAL;
 694         if ((dum->port_status & USB_PORT_STAT_CONNECTION) == 0)
 695                 return -ENOLINK;
 696         if ((dum->port_status & USB_PORT_STAT_SUSPEND) == 0 &&
 697                          dum->rh_state != DUMMY_RH_SUSPENDED)
 698                 return -EIO;
 699
 700         /* FIXME: What if the root hub is suspended but the port isn't? */
 701
 702         /* hub notices our request, issues downstream resume, etc */
 703         dum->resuming = 1;
 704         dum->re_timeout = jiffies + msecs_to_jiffies(20);
 705         mod_timer (&dummy_to_hcd (dum)->rh_timer, dum->re_timeout);
 706         return 0;
 707 }
 708
 709 static int dummy_set_selfpowered (struct usb_gadget *_gadget, int value)
 710 {
 711         struct dummy    *dum;
 712
 713         dum = gadget_to_dummy (_gadget);
 714         if (value)
 715                 dum->devstatus |= (1 << USB_DEVICE_SELF_POWERED);
 716         else
 717                 dum->devstatus &= ~(1 << USB_DEVICE_SELF_POWERED);
 718         return 0;
 719 }
 720
 721 static int dummy_pullup (struct usb_gadget *_gadget, int value)
 722 {
 723         struct dummy    *dum;
 724         unsigned long   flags;
 725
 726         dum = gadget_to_dummy (_gadget);
 727         spin_lock_irqsave (&dum->lock, flags);
 728         dum->pullup = (value != 0);
 729         set_link_state (dum);
 730         spin_unlock_irqrestore (&dum->lock, flags);
 731
 732         usb_hcd_poll_rh_status (dummy_to_hcd (dum));
 733         return 0;
 734 }
 735
 736 static const struct usb_gadget_ops dummy_ops = {
 737         .get_frame      = dummy_g_get_frame,
 738         .wakeup         = dummy_wakeup,
 739         .set_selfpowered = dummy_set_selfpowered,
 740         .pullup         = dummy_pullup,
 741 };
 742
 743 /*-------------------------------------------------------------------------*/
 744
 745 /* "function" sysfs attribute */
 746 static ssize_t
 747 show_function (struct device *dev, struct device_attribute *attr, char *buf)
 748 {
 749         struct dummy    *dum = gadget_dev_to_dummy (dev);
 750
 751         if (!dum->driver || !dum->driver->function)
 752                 return 0;
 753         return scnprintf (buf, PAGE_SIZE, "%s\n", dum->driver->function);
 754 }
 755 static DEVICE_ATTR (function, S_IRUGO, show_function, NULL);
 756
 757 /*-------------------------------------------------------------------------*/
 758
 759 /*
 760  * Driver registration/unregistration.
 761  *
 762  * This is basically hardware-specific; there's usually only one real USB
 763  * device (not host) controller since that's how USB devices are intended
 764  * to work.  So most implementations of these api calls will rely on the
 765  * fact that only one driver will ever bind to the hardware.  But curious
 766  * hardware can be built with discrete components, so the gadget API doesn't
 767  * require that assumption.
 768  *
 769  * For this emulator, it might be convenient to create a usb slave device
 770  * for each driver that registers:  just add to a big root hub.
 771  */
 772
 773 int
 774 usb_gadget_register_driver (struct usb_gadget_driver *driver)
 775 {
 776         struct dummy    *dum = the_controller;
 777         int             retval, i;
 778
 779         if (!dum)
 780                 return -EINVAL;
 781         if (dum->driver)
 782                 return -EBUSY;
 783         if (!driver->bind || !driver->unbind || !driver->setup
 784                         || driver->speed == USB_SPEED_UNKNOWN)
 785                 return -EINVAL;
 786
 787         /*
 788          * SLAVE side init ... the layer above hardware, which
 789          * can't enumerate without help from the driver we're binding.
 790          */
 791
 792         dum->devstatus = 0;
 793
 794         INIT_LIST_HEAD (&dum->gadget.ep_list);
 795         for (i = 0; i < DUMMY_ENDPOINTS; i++) {
 796                 struct dummy_ep *ep = &dum->ep [i];
 797
 798                 if (!ep_name [i])
 799                         break;
 800                 ep->ep.name = ep_name [i];
 801                 ep->ep.ops = &dummy_ep_ops;
 802                 list_add_tail (&ep->ep.ep_list, &dum->gadget.ep_list);
 803                 ep->halted = ep->already_seen = ep->setup_stage = 0;
 804                 ep->ep.maxpacket = ~0;
 805                 ep->last_io = jiffies;
 806                 ep->gadget = &dum->gadget;
 807                 ep->desc = NULL;
 808                 INIT_LIST_HEAD (&ep->queue);
 809         }
 810
 811         dum->gadget.ep0 = &dum->ep [0].ep;
 812         dum->ep [0].ep.maxpacket = 64;
 813         list_del_init (&dum->ep [0].ep.ep_list);
 814         INIT_LIST_HEAD(&dum->fifo_req.queue);
 815
 816         dum->driver = driver;
 817         dum->gadget.dev.driver = &driver->driver;
 818         dev_dbg (udc_dev(dum), "binding gadget driver '%s'\n",
 819                         driver->driver.name);
 820         if ((retval = driver->bind (&dum->gadget)) != 0) {
 821                 dum->driver = NULL;
 822                 dum->gadget.dev.driver = NULL;
 823                 return retval;
 824         }
 825
 826         driver->driver.bus = dum->gadget.dev.parent->bus;
 827         driver_register (&driver->driver);
 828         device_bind_driver (&dum->gadget.dev);
 829
 830         /* khubd will enumerate this in a while */
 831         spin_lock_irq (&dum->lock);
 832         dum->pullup = 1;
 833         set_link_state (dum);
 834         spin_unlock_irq (&dum->lock);
 835
 836         usb_hcd_poll_rh_status (dummy_to_hcd (dum));
 837         return 0;
 838 }
 839 EXPORT_SYMBOL (usb_gadget_register_driver);
 840
 841 int
 842 usb_gadget_unregister_driver (struct usb_gadget_driver *driver)
 843 {
 844         struct dummy    *dum = the_controller;
 845         unsigned long   flags;
 846
 847         if (!dum)
 848                 return -ENODEV;
 849         if (!driver || driver != dum->driver)
 850                 return -EINVAL;
 851
 852         dev_dbg (udc_dev(dum), "unregister gadget driver '%s'\n",
 853                         driver->driver.name);
 854
 855         spin_lock_irqsave (&dum->lock, flags);
 856         dum->pullup = 0;
 857         set_link_state (dum);
 858         spin_unlock_irqrestore (&dum->lock, flags);
 859
 860         driver->unbind (&dum->gadget);
 861         dum->driver = NULL;
 862
 863         device_release_driver (&dum->gadget.dev);
 864         driver_unregister (&driver->driver);
 865
 866         spin_lock_irqsave (&dum->lock, flags);
 867         dum->pullup = 0;
 868         set_link_state (dum);
 869         spin_unlock_irqrestore (&dum->lock, flags);
 870
 871         usb_hcd_poll_rh_status (dummy_to_hcd (dum));
 872         return 0;
 873 }
 874 EXPORT_SYMBOL (usb_gadget_unregister_driver);
 875
 876 #undef is_enabled
 877
 878 /* just declare this in any driver that really need it */
 879 extern int net2280_set_fifo_mode (struct usb_gadget *gadget, int mode);
 880
 881 int net2280_set_fifo_mode (struct usb_gadget *gadget, int mode)
 882 {
 883         return -ENOSYS;
 884 }
 885 EXPORT_SYMBOL (net2280_set_fifo_mode);
 886
 887
 888 /* The gadget structure is stored inside the hcd structure and will be
 889  * released along with it. */
 890 static void
 891 dummy_gadget_release (struct device *dev)
 892 {
 893 #if 0           /* usb_bus_put isn't EXPORTed! */
 894         struct dummy    *dum = gadget_dev_to_dummy (dev);
 895
 896         usb_bus_put (&dummy_to_hcd (dum)->self);
 897 #endif
 898 }
 899
 900 static int dummy_udc_probe (struct device *dev)
 901 {
 902         struct dummy    *dum = the_controller;
 903         int             rc;
 904
 905         dum->gadget.name = gadget_name;
 906         dum->gadget.ops = &dummy_ops;
 907         dum->gadget.is_dualspeed = 1;
 908
 909         /* maybe claim OTG support, though we won't complete HNP */
 910         dum->gadget.is_otg = (dummy_to_hcd(dum)->self.otg_port != 0);
 911
 912         strcpy (dum->gadget.dev.bus_id, "gadget");
 913         dum->gadget.dev.parent = dev;
 914         dum->gadget.dev.release = dummy_gadget_release;
 915         rc = device_register (&dum->gadget.dev);
 916         if (rc < 0)
 917                 return rc;
 918
 919 #if 0           /* usb_bus_get isn't EXPORTed! */
 920         usb_bus_get (&dummy_to_hcd (dum)->self);
 921 #endif
 922
 923         dev_set_drvdata (dev, dum);
 924         device_create_file (&dum->gadget.dev, &dev_attr_function);
 925         return rc;
 926 }
 927
 928 static int dummy_udc_remove (struct device *dev)
 929 {
 930         struct dummy    *dum = dev_get_drvdata (dev);
 931
 932         dev_set_drvdata (dev, NULL);
 933         device_remove_file (&dum->gadget.dev, &dev_attr_function);
 934         device_unregister (&dum->gadget.dev);
 935         return 0;
 936 }
 937
 938 static int dummy_udc_suspend (struct device *dev, pm_message_t state)
 939 {
 940         struct dummy    *dum = dev_get_drvdata(dev);
 941
 942         dev_dbg (dev, "%s\n", __FUNCTION__);
 943         spin_lock_irq (&dum->lock);
 944         dum->udc_suspended = 1;
 945         set_link_state (dum);
 946         spin_unlock_irq (&dum->lock);
 947
 948         dev->power.power_state = state;
 949         usb_hcd_poll_rh_status (dummy_to_hcd (dum));
 950         return 0;
 951 }
 952
 953 static int dummy_udc_resume (struct device *dev)
 954 {
 955         struct dummy    *dum = dev_get_drvdata(dev);
 956
 957         dev_dbg (dev, "%s\n", __FUNCTION__);
 958         spin_lock_irq (&dum->lock);
 959         dum->udc_suspended = 0;
 960         set_link_state (dum);
 961         spin_unlock_irq (&dum->lock);
 962
 963         dev->power.power_state = PMSG_ON;
 964         usb_hcd_poll_rh_status (dummy_to_hcd (dum));
 965         return 0;
 966 }
 967
 968 static struct device_driver dummy_udc_driver = {
 969         .name           = (char *) gadget_name,
 970         .owner          = THIS_MODULE,
 971         .bus            = &platform_bus_type,
 972         .probe          = dummy_udc_probe,
 973         .remove         = dummy_udc_remove,
 974         .suspend        = dummy_udc_suspend,
 975         .resume         = dummy_udc_resume,
 976 };
 977
 978 /*-------------------------------------------------------------------------*/
 979
 980 /* MASTER/HOST SIDE DRIVER
 981  *
 982  * this uses the hcd framework to hook up to host side drivers.
 983  * its root hub will only have one device, otherwise it acts like
 984  * a normal host controller.
 985  *
 986  * when urbs are queued, they're just stuck on a list that we
 987  * scan in a timer callback.  that callback connects writes from
 988  * the host with reads from the device, and so on, based on the
 989  * usb 2.0 rules.
 990  */
 991
 992 static int dummy_urb_enqueue (
 993         struct usb_hcd                  *hcd,
 994         struct usb_host_endpoint        *ep,
 995         struct urb                      *urb,
 996         gfp_t                           mem_flags
 997 ) {
 998         struct dummy    *dum;
 999         struct urbp     *urbp;
1000         unsigned long   flags;
1001
1002         if (!urb->transfer_buffer && urb->transfer_buffer_length)
1003                 return -EINVAL;
1004
1005         urbp = kmalloc (sizeof *urbp, mem_flags);
1006         if (!urbp)
1007                 return -ENOMEM;
1008         urbp->urb = urb;
1009
1010         dum = hcd_to_dummy (hcd);
1011         spin_lock_irqsave (&dum->lock, flags);
1012
1013         if (!dum->udev) {
1014                 dum->udev = urb->dev;
1015                 usb_get_dev (dum->udev);
1016         } else if (unlikely (dum->udev != urb->dev))
1017                 dev_err (dummy_dev(dum), "usb_device address has changed!\n");
1018
1019         list_add_tail (&urbp->urbp_list, &dum->urbp_list);
1020         urb->hcpriv = urbp;
1021         if (usb_pipetype (urb->pipe) == PIPE_CONTROL)
1022                 urb->error_count = 1;           /* mark as a new urb */
1023
1024         /* kick the scheduler, it'll do the rest */
1025         if (!timer_pending (&dum->timer))
1026                 mod_timer (&dum->timer, jiffies + 1);
1027
1028         spin_unlock_irqrestore (&dum->lock, flags);
1029         return 0;
1030 }
1031
1032 static int dummy_urb_dequeue (struct usb_hcd *hcd, struct urb *urb)
1033 {
1034         struct dummy    *dum;
1035         unsigned long   flags;
1036
1037         /* giveback happens automatically in timer callback,
1038          * so make sure the callback happens */
1039         dum = hcd_to_dummy (hcd);
1040         spin_lock_irqsave (&dum->lock, flags);
1041         if (dum->rh_state != DUMMY_RH_RUNNING && !list_empty(&dum->urbp_list))
1042                 mod_timer (&dum->timer, jiffies);
1043         spin_unlock_irqrestore (&dum->lock, flags);
1044         return 0;
1045 }
1046
1047 static void maybe_set_status (struct urb *urb, int status)
1048 {
1049         spin_lock (&urb->lock);
1050         if (urb->status == -EINPROGRESS)
1051                 urb->status = status;
1052         spin_unlock (&urb->lock);
1053 }
1054
1055 /* transfer up to a frame's worth; caller must own lock */
1056 static int
1057 transfer (struct dummy *dum, struct urb *urb, struct dummy_ep *ep, int limit)
1058 {
1059         struct dummy_request    *req;
1060
1061 top:
1062         /* if there's no request queued, the device is NAKing; return */
1063         list_for_each_entry (req, &ep->queue, queue) {
1064                 unsigned        host_len, dev_len, len;
1065                 int             is_short, to_host;
1066                 int             rescan = 0;
1067
1068                 /* 1..N packets of ep->ep.maxpacket each ... the last one
1069                  * may be short (including zero length).
1070                  *
1071                  * writer can send a zlp explicitly (length 0) or implicitly
1072                  * (length mod maxpacket zero, and 'zero' flag); they always
1073                  * terminate reads.
1074                  */
1075                 host_len = urb->transfer_buffer_length - urb->actual_length;
1076                 dev_len = req->req.length - req->req.actual;
1077                 len = min (host_len, dev_len);
1078
1079                 /* FIXME update emulated data toggle too */
1080
1081                 to_host = usb_pipein (urb->pipe);
1082                 if (unlikely (len == 0))
1083                         is_short = 1;
1084                 else {
1085                         char            *ubuf, *rbuf;
1086
1087                         /* not enough bandwidth left? */
1088                         if (limit < ep->ep.maxpacket && limit < len)
1089                                 break;
1090                         len = min (len, (unsigned) limit);
1091                         if (len == 0)
1092                                 break;
1093
1094                         /* use an extra pass for the final short packet */
1095                         if (len > ep->ep.maxpacket) {
1096                                 rescan = 1;
1097                                 len -= (len % ep->ep.maxpacket);
1098                         }
1099                         is_short = (len % ep->ep.maxpacket) != 0;
1100
1101                         /* else transfer packet(s) */
1102                         ubuf = urb->transfer_buffer + urb->actual_length;
1103                         rbuf = req->req.buf + req->req.actual;
1104                         if (to_host)
1105                                 memcpy (ubuf, rbuf, len);
1106                         else
1107                                 memcpy (rbuf, ubuf, len);
1108                         ep->last_io = jiffies;
1109
1110                         limit -= len;
1111                         urb->actual_length += len;
1112                         req->req.actual += len;
1113                 }
1114
1115                 /* short packets terminate, maybe with overflow/underflow.
1116                  * it's only really an error to write too much.
1117                  *
1118                  * partially filling a buffer optionally blocks queue advances
1119                  * (so completion handlers can clean up the queue) but we don't
1120                  * need to emulate such data-in-flight.  so we only show part
1121                  * of the URB_SHORT_NOT_OK effect: completion status.
1122                  */
1123                 if (is_short) {
1124                         if (host_len == dev_len) {
1125                                 req->req.status = 0;
1126                                 maybe_set_status (urb, 0);
1127                         } else if (to_host) {
1128                                 req->req.status = 0;
1129                                 if (dev_len > host_len)
1130                                         maybe_set_status (urb, -EOVERFLOW);
1131                                 else
1132                                         maybe_set_status (urb,
1133                                                 (urb->transfer_flags
1134                                                         & URB_SHORT_NOT_OK)
1135                                                 ? -EREMOTEIO : 0);
1136                         } else if (!to_host) {
1137                                 maybe_set_status (urb, 0);
1138                                 if (host_len > dev_len)
1139                                         req->req.status = -EOVERFLOW;
1140                                 else
1141                                         req->req.status = 0;
1142                         }
1143
1144                 /* many requests terminate without a short packet */
1145                 } else {
1146                         if (req->req.length == req->req.actual
1147                                         && !req->req.zero)
1148                                 req->req.status = 0;
1149                         if (urb->transfer_buffer_length == urb->actual_length
1150                                         && !(urb->transfer_flags
1151                                                 & URB_ZERO_PACKET)) {
1152                                 maybe_set_status (urb, 0);
1153                         }
1154                 }
1155
1156                 /* device side completion --> continuable */
1157                 if (req->req.status != -EINPROGRESS) {
1158                         list_del_init (&req->queue);
1159
1160                         spin_unlock (&dum->lock);
1161                         req->req.complete (&ep->ep, &req->req);
1162                         spin_lock (&dum->lock);
1163
1164                         /* requests might have been unlinked... */
1165                         rescan = 1;
1166                 }
1167
1168                 /* host side completion --> terminate */
1169                 if (urb->status != -EINPROGRESS)
1170                         break;
1171
1172                 /* rescan to continue with any other queued i/o */
1173                 if (rescan)
1174                         goto top;
1175         }
1176         return limit;
1177 }
1178
1179 static int periodic_bytes (struct dummy *dum, struct dummy_ep *ep)
1180 {
1181         int     limit = ep->ep.maxpacket;
1182
1183         if (dum->gadget.speed == USB_SPEED_HIGH) {
1184                 int     tmp;
1185
1186                 /* high bandwidth mode */
1187                 tmp = le16_to_cpu(ep->desc->wMaxPacketSize);
1188                 tmp = (tmp >> 11) & 0x03;
1189                 tmp *= 8 /* applies to entire frame */;
1190                 limit += limit * tmp;
1191         }
1192         return limit;
1193 }
1194
1195 #define is_active(dum)  ((dum->port_status & \
1196                 (USB_PORT_STAT_CONNECTION | USB_PORT_STAT_ENABLE | \
1197                         USB_PORT_STAT_SUSPEND)) \
1198                 == (USB_PORT_STAT_CONNECTION | USB_PORT_STAT_ENABLE))
1199
1200 static struct dummy_ep *find_endpoint (struct dummy *dum, u8 address)
1201 {
1202         int             i;
1203
1204         if (!is_active (dum))
1205                 return NULL;
1206         if ((address & ~USB_DIR_IN) == 0)
1207                 return &dum->ep [0];
1208         for (i = 1; i < DUMMY_ENDPOINTS; i++) {
1209                 struct dummy_ep *ep = &dum->ep [i];
1210
1211                 if (!ep->desc)
1212                         continue;
1213                 if (ep->desc->bEndpointAddress == address)
1214                         return ep;
1215         }
1216         return NULL;
1217 }
1218
1219 #undef is_active
1220
1221 #define Dev_Request     (USB_TYPE_STANDARD | USB_RECIP_DEVICE)
1222 #define Dev_InRequest   (Dev_Request | USB_DIR_IN)
1223 #define Intf_Request    (USB_TYPE_STANDARD | USB_RECIP_INTERFACE)
1224 #define Intf_InRequest  (Intf_Request | USB_DIR_IN)
1225 #define Ep_Request      (USB_TYPE_STANDARD | USB_RECIP_ENDPOINT)
1226 #define Ep_InRequest    (Ep_Request | USB_DIR_IN)
1227
1228 /* drive both sides of the transfers; looks like irq handlers to
1229  * both drivers except the callbacks aren't in_irq().
1230  */
1231 static void dummy_timer (unsigned long _dum)
1232 {
1233         struct dummy            *dum = (struct dummy *) _dum;
1234         struct urbp             *urbp, *tmp;
1235         unsigned long           flags;
1236         int                     limit, total;
1237         int                     i;
1238
1239         /* simplistic model for one frame's bandwidth */
1240         switch (dum->gadget.speed) {
1241         case USB_SPEED_LOW:
1242                 total = 8/*bytes*/ * 12/*packets*/;
1243                 break;
1244         case USB_SPEED_FULL:
1245                 total = 64/*bytes*/ * 19/*packets*/;
1246                 break;
1247         case USB_SPEED_HIGH:
1248                 total = 512/*bytes*/ * 13/*packets*/ * 8/*uframes*/;
1249                 break;
1250         default:
1251                 dev_err (dummy_dev(dum), "bogus device speed\n");
1252                 return;
1253         }
1254
1255         /* FIXME if HZ != 1000 this will probably misbehave ... */
1256
1257         /* look at each urb queued by the host side driver */
1258         spin_lock_irqsave (&dum->lock, flags);
1259
1260         if (!dum->udev) {
1261                 dev_err (dummy_dev(dum),
1262                                 "timer fired with no URBs pending?\n");
1263                 spin_unlock_irqrestore (&dum->lock, flags);
1264                 return;
1265         }
1266
1267         for (i = 0; i < DUMMY_ENDPOINTS; i++) {
1268                 if (!ep_name [i])
1269                         break;
1270                 dum->ep [i].already_seen = 0;
1271         }
1272
1273 restart:
1274         list_for_each_entry_safe (urbp, tmp, &dum->urbp_list, urbp_list) {
1275                 struct urb              *urb;
1276                 struct dummy_request    *req;
1277                 u8                      address;
1278                 struct dummy_ep         *ep = NULL;
1279                 int                     type;
1280
1281                 urb = urbp->urb;
1282                 if (urb->status != -EINPROGRESS) {
1283                         /* likely it was just unlinked */
1284                         goto return_urb;
1285                 } else if (dum->rh_state != DUMMY_RH_RUNNING)
1286                         continue;
1287                 type = usb_pipetype (urb->pipe);
1288
1289                 /* used up this frame's non-periodic bandwidth?
1290                  * FIXME there's infinite bandwidth for control and
1291                  * periodic transfers ... unrealistic.
1292                  */
1293                 if (total <= 0 && type == PIPE_BULK)
1294                         continue;
1295
1296                 /* find the gadget's ep for this request (if configured) */
1297                 address = usb_pipeendpoint (urb->pipe);
1298                 if (usb_pipein (urb->pipe))
1299                         address |= USB_DIR_IN;
1300                 ep = find_endpoint(dum, address);
1301                 if (!ep) {
1302                         /* set_configuration() disagreement */
1303                         dev_dbg (dummy_dev(dum),
1304                                 "no ep configured for urb %p\n",
1305                                 urb);
1306                         maybe_set_status (urb, -EPROTO);
1307                         goto return_urb;
1308                 }
1309
1310                 if (ep->already_seen)
1311                         continue;
1312                 ep->already_seen = 1;
1313                 if (ep == &dum->ep [0] && urb->error_count) {
1314                         ep->setup_stage = 1;    /* a new urb */
1315                         urb->error_count = 0;
1316                 }
1317                 if (ep->halted && !ep->setup_stage) {
1318                         /* NOTE: must not be iso! */
1319                         dev_dbg (dummy_dev(dum), "ep %s halted, urb %p\n",
1320                                         ep->ep.name, urb);
1321                         maybe_set_status (urb, -EPIPE);
1322                         goto return_urb;
1323                 }
1324                 /* FIXME make sure both ends agree on maxpacket */
1325
1326                 /* handle control requests */
1327                 if (ep == &dum->ep [0] && ep->setup_stage) {
1328                         struct usb_ctrlrequest          setup;
1329                         int                             value = 1;
1330                         struct dummy_ep                 *ep2;
1331                         unsigned                        w_index;
1332                         unsigned                        w_value;
1333
1334                         setup = *(struct usb_ctrlrequest*) urb->setup_packet;
1335                         w_index = le16_to_cpu(setup.wIndex);
1336                         w_value = le16_to_cpu(setup.wValue);
1337                         if (le16_to_cpu(setup.wLength) !=
1338                                         urb->transfer_buffer_length) {
1339                                 maybe_set_status (urb, -EOVERFLOW);
1340                                 goto return_urb;
1341                         }
1342
1343                         /* paranoia, in case of stale queued data */
1344                         list_for_each_entry (req, &ep->queue, queue) {
1345                                 list_del_init (&req->queue);
1346                                 req->req.status = -EOVERFLOW;
1347                                 dev_dbg (udc_dev(dum), "stale req = %p\n",
1348                                                 req);
1349
1350                                 spin_unlock (&dum->lock);
1351                                 req->req.complete (&ep->ep, &req->req);
1352                                 spin_lock (&dum->lock);
1353                                 ep->already_seen = 0;
1354                                 goto restart;
1355                         }
1356
1357                         /* gadget driver never sees set_address or operations
1358                          * on standard feature flags.  some hardware doesn't
1359                          * even expose them.
1360                          */
1361                         ep->last_io = jiffies;
1362                         ep->setup_stage = 0;
1363                         ep->halted = 0;
1364                         switch (setup.bRequest) {
1365                         case USB_REQ_SET_ADDRESS:
1366                                 if (setup.bRequestType != Dev_Request)
1367                                         break;
1368                                 dum->address = w_value;
1369                                 maybe_set_status (urb, 0);
1370                                 dev_dbg (udc_dev(dum), "set_address = %d\n",
1371                                                 w_value);
1372                                 value = 0;
1373                                 break;
1374                         case USB_REQ_SET_FEATURE:
1375                                 if (setup.bRequestType == Dev_Request) {
1376                                         value = 0;
1377                                         switch (w_value) {
1378                                         case USB_DEVICE_REMOTE_WAKEUP:
1379                                                 break;
1380                                         case USB_DEVICE_B_HNP_ENABLE:
1381                                                 dum->gadget.b_hnp_enable = 1;
1382                                                 break;
1383                                         case USB_DEVICE_A_HNP_SUPPORT:
1384                                                 dum->gadget.a_hnp_support = 1;
1385                                                 break;
1386                                         case USB_DEVICE_A_ALT_HNP_SUPPORT:
1387                                                 dum->gadget.a_alt_hnp_support
1388                                                         = 1;
1389                                                 break;
1390                                         default:
1391                                                 value = -EOPNOTSUPP;
1392                                         }
1393                                         if (value == 0) {
1394                                                 dum->devstatus |=
1395                                                         (1 << w_value);
1396                                                 maybe_set_status (urb, 0);
1397                                         }
1398
1399                                 } else if (setup.bRequestType == Ep_Request) {
1400                                         // endpoint halt
1401                                         ep2 = find_endpoint (dum, w_index);
1402                                         if (!ep2) {
1403                                                 value = -EOPNOTSUPP;
1404                                                 break;
1405                                         }
1406                                         ep2->halted = 1;
1407                                         value = 0;
1408                                         maybe_set_status (urb, 0);
1409                                 }
1410                                 break;
1411                         case USB_REQ_CLEAR_FEATURE:
1412                                 if (setup.bRequestType == Dev_Request) {
1413                                         switch (w_value) {
1414                                         case USB_DEVICE_REMOTE_WAKEUP:
1415                                                 dum->devstatus &= ~(1 <<
1416                                                         USB_DEVICE_REMOTE_WAKEUP);
1417                                                 value = 0;
1418                                                 maybe_set_status (urb, 0);
1419                                                 break;
1420                                         default:
1421                                                 value = -EOPNOTSUPP;
1422                                                 break;
1423                                         }
1424                                 } else if (setup.bRequestType == Ep_Request) {
1425                                         // endpoint halt
1426                                         ep2 = find_endpoint (dum, w_index);
1427                                         if (!ep2) {
1428                                                 value = -EOPNOTSUPP;
1429                                                 break;
1430                                         }
1431                                         ep2->halted = 0;
1432                                         value = 0;
1433                                         maybe_set_status (urb, 0);
1434                                 }
1435                                 break;
1436                         case USB_REQ_GET_STATUS:
1437                                 if (setup.bRequestType == Dev_InRequest
1438                                                 || setup.bRequestType
1439                                                         == Intf_InRequest
1440                                                 || setup.bRequestType
1441                                                         == Ep_InRequest
1442                                                 ) {
1443                                         char *buf;
1444
1445                                         // device: remote wakeup, selfpowered
1446                                         // interface: nothing
1447                                         // endpoint: halt
1448                                         buf = (char *)urb->transfer_buffer;
1449                                         if (urb->transfer_buffer_length > 0) {
1450                                                 if (setup.bRequestType ==
1451                                                                 Ep_InRequest) {
1452         ep2 = find_endpoint (dum, w_index);
1453         if (!ep2) {
1454                 value = -EOPNOTSUPP;
1455                 break;
1456         }
1457         buf [0] = ep2->halted;
1458                                                 } else if (setup.bRequestType ==
1459                                                                 Dev_InRequest) {
1460                                                         buf [0] = (u8)
1461                                                                 dum->devstatus;
1462                                                 } else
1463                                                         buf [0] = 0;
1464                                         }
1465                                         if (urb->transfer_buffer_length > 1)
1466                                                 buf [1] = 0;
1467                                         urb->actual_length = min (2,
1468                                                 urb->transfer_buffer_length);
1469                                         value = 0;
1470                                         maybe_set_status (urb, 0);
1471                                 }
1472                                 break;
1473                         }
1474
1475                         /* gadget driver handles all other requests.  block
1476                          * until setup() returns; no reentrancy issues etc.
1477                          */
1478                         if (value > 0) {
1479                                 spin_unlock (&dum->lock);
1480                                 value = dum->driver->setup (&dum->gadget,
1481                                                 &setup);
1482                                 spin_lock (&dum->lock);
1483
1484                                 if (value >= 0) {
1485                                         /* no delays (max 64KB data stage) */
1486                                         limit = 64*1024;
1487                                         goto treat_control_like_bulk;
1488                                 }
1489                                 /* error, see below */
1490                         }
1491
1492                         if (value < 0) {
1493                                 if (value != -EOPNOTSUPP)
1494                                         dev_dbg (udc_dev(dum),
1495                                                 "setup --> %d\n",
1496                                                 value);
1497                                 maybe_set_status (urb, -EPIPE);
1498                                 urb->actual_length = 0;
1499                         }
1500
1501                         goto return_urb;
1502                 }
1503
1504                 /* non-control requests */
1505                 limit = total;
1506                 switch (usb_pipetype (urb->pipe)) {
1507                 case PIPE_ISOCHRONOUS:
1508                         /* FIXME is it urb->interval since the last xfer?
1509                          * use urb->iso_frame_desc[i].
1510                          * complete whether or not ep has requests queued.
1511                          * report random errors, to debug drivers.
1512                          */
1513                         limit = max (limit, periodic_bytes (dum, ep));
1514                         maybe_set_status (urb, -ENOSYS);
1515                         break;
1516
1517                 case PIPE_INTERRUPT:
1518                         /* FIXME is it urb->interval since the last xfer?
1519                          * this almost certainly polls too fast.
1520                          */
1521                         limit = max (limit, periodic_bytes (dum, ep));
1522                         /* FALLTHROUGH */
1523
1524                 // case PIPE_BULK:  case PIPE_CONTROL:
1525                 default:
1526                 treat_control_like_bulk:
1527                         ep->last_io = jiffies;
1528                         total = transfer (dum, urb, ep, limit);
1529                         break;
1530                 }
1531
1532                 /* incomplete transfer? */
1533                 if (urb->status == -EINPROGRESS)
1534                         continue;
1535
1536 return_urb:
1537                 urb->hcpriv = NULL;
1538                 list_del (&urbp->urbp_list);
1539                 kfree (urbp);
1540                 if (ep)
1541                         ep->already_seen = ep->setup_stage = 0;
1542
1543                 spin_unlock (&dum->lock);
1544                 usb_hcd_giveback_urb (dummy_to_hcd(dum), urb, NULL);
1545                 spin_lock (&dum->lock);
1546
1547                 goto restart;
1548         }
1549
1550         if (list_empty (&dum->urbp_list)) {
1551                 usb_put_dev (dum->udev);
1552                 dum->udev = NULL;
1553         } else if (dum->rh_state == DUMMY_RH_RUNNING) {
1554                 /* want a 1 msec delay here */
1555                 mod_timer (&dum->timer, jiffies + msecs_to_jiffies(1));
1556         }
1557
1558         spin_unlock_irqrestore (&dum->lock, flags);
1559 }
1560
1561 /*-------------------------------------------------------------------------*/
1562
1563 #define PORT_C_MASK \
1564         ((USB_PORT_STAT_C_CONNECTION \
1565         | USB_PORT_STAT_C_ENABLE \
1566         | USB_PORT_STAT_C_SUSPEND \
1567         | USB_PORT_STAT_C_OVERCURRENT \
1568         | USB_PORT_STAT_C_RESET) << 16)
1569
1570 static int dummy_hub_status (struct usb_hcd *hcd, char *buf)
1571 {
1572         struct dummy            *dum;
1573         unsigned long           flags;
1574         int                     retval = 0;
1575
1576         dum = hcd_to_dummy (hcd);
1577
1578         spin_lock_irqsave (&dum->lock, flags);
1579         if (hcd->state != HC_STATE_RUNNING)
1580                 goto done;
1581
1582         if (dum->resuming && time_after_eq (jiffies, dum->re_timeout)) {
1583                 dum->port_status |= (USB_PORT_STAT_C_SUSPEND << 16);
1584                 dum->port_status &= ~USB_PORT_STAT_SUSPEND;
1585                 set_link_state (dum);
1586         }
1587
1588         if ((dum->port_status & PORT_C_MASK) != 0) {
1589                 *buf = (1 << 1);
1590                 dev_dbg (dummy_dev(dum), "port status 0x%08x has changes\n",
1591                                 dum->port_status);
1592                 retval = 1;
1593                 if (dum->rh_state == DUMMY_RH_SUSPENDED)
1594                         usb_hcd_resume_root_hub (hcd);
1595         }
1596 done:
1597         spin_unlock_irqrestore (&dum->lock, flags);
1598         return retval;
1599 }
1600
1601 static inline void
1602 hub_descriptor (struct usb_hub_descriptor *desc)
1603 {
1604         memset (desc, 0, sizeof *desc);
1605         desc->bDescriptorType = 0x29;
1606         desc->bDescLength = 9;
1607         desc->wHubCharacteristics = (__force __u16)
1608                         (__constant_cpu_to_le16 (0x0001));
1609         desc->bNbrPorts = 1;
1610         desc->bitmap [0] = 0xff;
1611         desc->bitmap [1] = 0xff;
1612 }
1613
1614 static int dummy_hub_control (
1615         struct usb_hcd  *hcd,
1616         u16             typeReq,
1617         u16             wValue,
1618         u16             wIndex,
1619         char            *buf,
1620         u16             wLength
1621 ) {
1622         struct dummy    *dum;
1623         int             retval = 0;
1624         unsigned long   flags;
1625
1626         if (hcd->state != HC_STATE_RUNNING)
1627                 return -ETIMEDOUT;
1628
1629         dum = hcd_to_dummy (hcd);
1630         spin_lock_irqsave (&dum->lock, flags);
1631         switch (typeReq) {
1632         case ClearHubFeature:
1633                 break;
1634         case ClearPortFeature:
1635                 switch (wValue) {
1636                 case USB_PORT_FEAT_SUSPEND:
1637                         if (dum->port_status & USB_PORT_STAT_SUSPEND) {
1638                                 /* 20msec resume signaling */
1639                                 dum->resuming = 1;
1640                                 dum->re_timeout = jiffies +
1641                                                 msecs_to_jiffies(20);
1642                         }
1643                         break;
1644                 case USB_PORT_FEAT_POWER:
1645                         if (dum->port_status & USB_PORT_STAT_POWER)
1646                                 dev_dbg (dummy_dev(dum), "power-off\n");
1647                         /* FALLS THROUGH */
1648                 default:
1649                         dum->port_status &= ~(1 << wValue);
1650                         set_link_state (dum);
1651                 }
1652                 break;
1653         case GetHubDescriptor:
1654                 hub_descriptor ((struct usb_hub_descriptor *) buf);
1655                 break;
1656         case GetHubStatus:
1657                 *(__le32 *) buf = __constant_cpu_to_le32 (0);
1658                 break;
1659         case GetPortStatus:
1660                 if (wIndex != 1)
1661                         retval = -EPIPE;
1662
1663                 /* whoever resets or resumes must GetPortStatus to
1664                  * complete it!!
1665                  */
1666                 if (dum->resuming &&
1667                                 time_after_eq (jiffies, dum->re_timeout)) {
1668                         dum->port_status |= (USB_PORT_STAT_C_SUSPEND << 16);
1669                         dum->port_status &= ~USB_PORT_STAT_SUSPEND;
1670                 }
1671                 if ((dum->port_status & USB_PORT_STAT_RESET) != 0 &&
1672                                 time_after_eq (jiffies, dum->re_timeout)) {
1673                         dum->port_status |= (USB_PORT_STAT_C_RESET << 16);
1674                         dum->port_status &= ~USB_PORT_STAT_RESET;
1675                         if (dum->pullup) {
1676                                 dum->port_status |= USB_PORT_STAT_ENABLE;
1677                                 /* give it the best speed we agree on */
1678                                 dum->gadget.speed = dum->driver->speed;
1679                                 dum->gadget.ep0->maxpacket = 64;
1680                                 switch (dum->gadget.speed) {
1681                                 case USB_SPEED_HIGH:
1682                                         dum->port_status |=
1683                                                 USB_PORT_STAT_HIGH_SPEED;
1684                                         break;
1685                                 case USB_SPEED_LOW:
1686                                         dum->gadget.ep0->maxpacket = 8;
1687                                         dum->port_status |=
1688                                                 USB_PORT_STAT_LOW_SPEED;
1689                                         break;
1690                                 default:
1691                                         dum->gadget.speed = USB_SPEED_FULL;
1692                                         break;
1693                                 }
1694                         }
1695                 }
1696                 set_link_state (dum);
1697                 ((__le16 *) buf)[0] = cpu_to_le16 (dum->port_status);
1698                 ((__le16 *) buf)[1] = cpu_to_le16 (dum->port_status >> 16);
1699                 break;
1700         case SetHubFeature:
1701                 retval = -EPIPE;
1702                 break;
1703         case SetPortFeature:
1704                 switch (wValue) {
1705                 case USB_PORT_FEAT_SUSPEND:
1706                         if (dum->active) {
1707                                 dum->port_status |= USB_PORT_STAT_SUSPEND;
1708
1709                                 /* HNP would happen here; for now we
1710                                  * assume b_bus_req is always true.
1711                                  */
1712                                 set_link_state (dum);
1713                                 if (((1 << USB_DEVICE_B_HNP_ENABLE)
1714                                                 & dum->devstatus) != 0)
1715                                         dev_dbg (dummy_dev(dum),
1716                                                         "no HNP yet!\n");
1717                         }
1718                         break;
1719                 case USB_PORT_FEAT_POWER:
1720                         dum->port_status |= USB_PORT_STAT_POWER;
1721                         set_link_state (dum);
1722                         break;
1723                 case USB_PORT_FEAT_RESET:
1724                         /* if it's already enabled, disable */
1725                         dum->port_status &= ~(USB_PORT_STAT_ENABLE
1726                                         | USB_PORT_STAT_LOW_SPEED
1727                                         | USB_PORT_STAT_HIGH_SPEED);
1728                         dum->devstatus = 0;
1729                         /* 50msec reset signaling */
1730                         dum->re_timeout = jiffies + msecs_to_jiffies(50);
1731                         /* FALLS THROUGH */
1732                 default:
1733                         if ((dum->port_status & USB_PORT_STAT_POWER) != 0) {
1734                                 dum->port_status |= (1 << wValue);
1735                                 set_link_state (dum);
1736                         }
1737                 }
1738                 break;
1739
1740         default:
1741                 dev_dbg (dummy_dev(dum),
1742                         "hub control req%04x v%04x i%04x l%d\n",
1743                         typeReq, wValue, wIndex, wLength);
1744
1745                 /* "protocol stall" on error */
1746                 retval = -EPIPE;
1747         }
1748         spin_unlock_irqrestore (&dum->lock, flags);
1749
1750         if ((dum->port_status & PORT_C_MASK) != 0)
1751                 usb_hcd_poll_rh_status (hcd);
1752         return retval;
1753 }
1754
1755 static int dummy_bus_suspend (struct usb_hcd *hcd)
1756 {
1757         struct dummy *dum = hcd_to_dummy (hcd);
1758
1759         spin_lock_irq (&dum->lock);
1760         dum->rh_state = DUMMY_RH_SUSPENDED;
1761         set_link_state (dum);
1762         spin_unlock_irq (&dum->lock);
1763         return 0;
1764 }
1765
1766 static int dummy_bus_resume (struct usb_hcd *hcd)
1767 {
1768         struct dummy *dum = hcd_to_dummy (hcd);
1769
1770         spin_lock_irq (&dum->lock);
1771         dum->rh_state = DUMMY_RH_RUNNING;
1772         set_link_state (dum);
1773         if (!list_empty(&dum->urbp_list))
1774                 mod_timer (&dum->timer, jiffies);
1775         spin_unlock_irq (&dum->lock);
1776         return 0;
1777 }
1778
1779 /*-------------------------------------------------------------------------*/
1780
1781 static inline ssize_t
1782 show_urb (char *buf, size_t size, struct urb *urb)
1783 {
1784         int ep = usb_pipeendpoint (urb->pipe);
1785
1786         return snprintf (buf, size,
1787                 "urb/%p %s ep%d%s%s len %d/%d\n",
1788                 urb,
1789                 ({ char *s;
1790                  switch (urb->dev->speed) {
1791                  case USB_SPEED_LOW:    s = "ls"; break;
1792                  case USB_SPEED_FULL:   s = "fs"; break;
1793                  case USB_SPEED_HIGH:   s = "hs"; break;
1794                  default:               s = "?"; break;
1795                  }; s; }),
1796                 ep, ep ? (usb_pipein (urb->pipe) ? "in" : "out") : "",
1797                 ({ char *s; \
1798                  switch (usb_pipetype (urb->pipe)) { \
1799                  case PIPE_CONTROL:     s = ""; break; \
1800                  case PIPE_BULK:        s = "-bulk"; break; \
1801                  case PIPE_INTERRUPT:   s = "-int"; break; \
1802                  default:               s = "-iso"; break; \
1803                 }; s;}),
1804                 urb->actual_length, urb->transfer_buffer_length);
1805 }
1806
1807 static ssize_t
1808 show_urbs (struct device *dev, struct device_attribute *attr, char *buf)
1809 {
1810         struct usb_hcd          *hcd = dev_get_drvdata (dev);
1811         struct dummy            *dum = hcd_to_dummy (hcd);
1812         struct urbp             *urbp;
1813         size_t                  size = 0;
1814         unsigned long           flags;
1815
1816         spin_lock_irqsave (&dum->lock, flags);
1817         list_for_each_entry (urbp, &dum->urbp_list, urbp_list) {
1818                 size_t          temp;
1819
1820                 temp = show_urb (buf, PAGE_SIZE - size, urbp->urb);
1821                 buf += temp;
1822                 size += temp;
1823         }
1824         spin_unlock_irqrestore (&dum->lock, flags);
1825
1826         return size;
1827 }
1828 static DEVICE_ATTR (urbs, S_IRUGO, show_urbs, NULL);
1829
1830 static int dummy_start (struct usb_hcd *hcd)
1831 {
1832         struct dummy            *dum;
1833
1834         dum = hcd_to_dummy (hcd);
1835
1836         /*
1837          * MASTER side init ... we emulate a root hub that'll only ever
1838          * talk to one device (the slave side).  Also appears in sysfs,
1839          * just like more familiar pci-based HCDs.
1840          */
1841         spin_lock_init (&dum->lock);
1842         init_timer (&dum->timer);
1843         dum->timer.function = dummy_timer;
1844         dum->timer.data = (unsigned long) dum;
1845         dum->rh_state = DUMMY_RH_RUNNING;
1846
1847         INIT_LIST_HEAD (&dum->urbp_list);
1848
1849         /* only show a low-power port: just 8mA */
1850         hcd->power_budget = 8;
1851         hcd->state = HC_STATE_RUNNING;
1852         hcd->uses_new_polling = 1;
1853
1854 #ifdef CONFIG_USB_OTG
1855         hcd->self.otg_port = 1;
1856 #endif
1857
1858         /* FIXME 'urbs' should be a per-device thing, maybe in usbcore */
1859         device_create_file (dummy_dev(dum), &dev_attr_urbs);
1860         return 0;
1861 }
1862
1863 static void dummy_stop (struct usb_hcd *hcd)
1864 {
1865         struct dummy            *dum;
1866
1867         dum = hcd_to_dummy (hcd);
1868
1869         device_remove_file (dummy_dev(dum), &dev_attr_urbs);
1870         usb_gadget_unregister_driver (dum->driver);
1871         dev_info (dummy_dev(dum), "stopped\n");
1872 }
1873
1874 /*-------------------------------------------------------------------------*/
1875
1876 static int dummy_h_get_frame (struct usb_hcd *hcd)
1877 {
1878         return dummy_g_get_frame (NULL);
1879 }
1880
1881 static const struct hc_driver dummy_hcd = {
1882         .description =          (char *) driver_name,
1883         .product_desc =         "Dummy host controller",
1884         .hcd_priv_size =        sizeof(struct dummy),
1885
1886         .flags =                HCD_USB2,
1887
1888         .start =                dummy_start,
1889         .stop =                 dummy_stop,
1890
1891         .urb_enqueue =          dummy_urb_enqueue,
1892         .urb_dequeue =          dummy_urb_dequeue,
1893
1894         .get_frame_number =     dummy_h_get_frame,
1895
1896         .hub_status_data =      dummy_hub_status,
1897         .hub_control =          dummy_hub_control,
1898         .bus_suspend =          dummy_bus_suspend,
1899         .bus_resume =           dummy_bus_resume,
1900 };
1901
1902 static int dummy_hcd_probe (struct device *dev)
1903 {
1904         struct usb_hcd          *hcd;
1905         int                     retval;
1906
1907         dev_info (dev, "%s, driver " DRIVER_VERSION "\n", driver_desc);
1908
1909         hcd = usb_create_hcd (&dummy_hcd, dev, dev->bus_id);
1910         if (!hcd)
1911                 return -ENOMEM;
1912         the_controller = hcd_to_dummy (hcd);
1913
1914         retval = usb_add_hcd(hcd, 0, 0);
1915         if (retval != 0) {
1916                 usb_put_hcd (hcd);
1917                 the_controller = NULL;
1918         }
1919         return retval;
1920 }
1921
1922 static int dummy_hcd_remove (struct device *dev)
1923 {
1924         struct usb_hcd          *hcd;
1925
1926         hcd = dev_get_drvdata (dev);
1927         usb_remove_hcd (hcd);
1928         usb_put_hcd (hcd);
1929         the_controller = NULL;
1930         return 0;
1931 }
1932
1933 static int dummy_hcd_suspend (struct device *dev, pm_message_t state)
1934 {
1935         struct usb_hcd          *hcd;
1936
1937         dev_dbg (dev, "%s\n", __FUNCTION__);
1938         hcd = dev_get_drvdata (dev);
1939
1940         hcd->state = HC_STATE_SUSPENDED;
1941         return 0;
1942 }
1943
1944 static int dummy_hcd_resume (struct device *dev)
1945 {
1946         struct usb_hcd          *hcd;
1947
1948         dev_dbg (dev, "%s\n", __FUNCTION__);
1949         hcd = dev_get_drvdata (dev);
1950         hcd->state = HC_STATE_RUNNING;
1951
1952         usb_hcd_poll_rh_status (hcd);
1953         return 0;
1954 }
1955
1956 static struct device_driver dummy_hcd_driver = {
1957         .name           = (char *) driver_name,
1958         .owner          = THIS_MODULE,
1959         .bus            = &platform_bus_type,
1960         .probe          = dummy_hcd_probe,
1961         .remove         = dummy_hcd_remove,
1962         .suspend        = dummy_hcd_suspend,
1963         .resume         = dummy_hcd_resume,
1964 };
1965
1966 /*-------------------------------------------------------------------------*/
1967
1968 /* These don't need to do anything because the pdev structures are
1969  * statically allocated. */
1970 static void
1971 dummy_udc_release (struct device *dev) {}
1972
1973 static void
1974 dummy_hcd_release (struct device *dev) {}
1975
1976 static struct platform_device           the_udc_pdev = {
1977         .name           = (char *) gadget_name,
1978         .id             = -1,
1979         .dev            = {
1980                 .release        = dummy_udc_release,
1981         },
1982 };
1983
1984 static struct platform_device           the_hcd_pdev = {
1985         .name           = (char *) driver_name,
1986         .id             = -1,
1987         .dev            = {
1988                 .release        = dummy_hcd_release,
1989         },
1990 };
1991
1992 static int __init init (void)
1993 {
1994         int     retval;
1995
1996         if (usb_disabled ())
1997                 return -ENODEV;
1998
1999         retval = driver_register (&dummy_hcd_driver);
2000         if (retval < 0)
2001                 return retval;
2002
2003         retval = driver_register (&dummy_udc_driver);
2004         if (retval < 0)
2005                 goto err_register_udc_driver;
2006
2007         retval = platform_device_register (&the_hcd_pdev);
2008         if (retval < 0)
2009                 goto err_register_hcd;
2010
2011         retval = platform_device_register (&the_udc_pdev);
2012         if (retval < 0)
2013                 goto err_register_udc;
2014         return retval;
2015
2016 err_register_udc:
2017         platform_device_unregister (&the_hcd_pdev);
2018 err_register_hcd:
2019         driver_unregister (&dummy_udc_driver);
2020 err_register_udc_driver:
2021         driver_unregister (&dummy_hcd_driver);
2022         return retval;
2023 }
2024 module_init (init);
2025
2026 static void __exit cleanup (void)
2027 {
2028         platform_device_unregister (&the_udc_pdev);
2029         platform_device_unregister (&the_hcd_pdev);
2030         driver_unregister (&dummy_udc_driver);
2031         driver_unregister (&dummy_hcd_driver);
2032 }
2033 module_exit (cleanup);