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 #include <linux/usb/hcd.h>
  51
  52 #include <asm/byteorder.h>
  53 #include <asm/io.h>
  54 #include <asm/irq.h>
  55 #include <asm/system.h>
  56 #include <asm/unaligned.h>
  57
  58
  59 #define DRIVER_DESC     "USB Host+Gadget Emulator"
  60 #define DRIVER_VERSION  "02 May 2005"
  61
  62 #define POWER_BUDGET    500     /* in mA; use 8 for low-power port testing */
  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                        wedged : 1;
  84         unsigned                        already_seen : 1;
  85         unsigned                        setup_stage : 1;
  86 };
  87
  88 struct dummy_request {
  89         struct list_head                queue;          /* ep's requests */
  90         struct usb_request              req;
  91 };
  92
  93 static inline struct dummy_ep *usb_ep_to_dummy_ep (struct usb_ep *_ep)
  94 {
  95         return container_of (_ep, struct dummy_ep, ep);
  96 }
  97
  98 static inline struct dummy_request *usb_request_to_dummy_request
  99                 (struct usb_request *_req)
 100 {
 101         return container_of (_req, struct dummy_request, req);
 102 }
 103
 104 /*-------------------------------------------------------------------------*/
 105
 106 /*
 107  * Every device has ep0 for control requests, plus up to 30 more endpoints,
 108  * in one of two types:
 109  *
 110  *   - Configurable:  direction (in/out), type (bulk, iso, etc), and endpoint
 111  *     number can be changed.  Names like "ep-a" are used for this type.
 112  *
 113  *   - Fixed Function:  in other cases.  some characteristics may be mutable;
 114  *     that'd be hardware-specific.  Names like "ep12out-bulk" are used.
 115  *
 116  * Gadget drivers are responsible for not setting up conflicting endpoint
 117  * configurations, illegal or unsupported packet lengths, and so on.
 118  */
 119
 120 static const char ep0name [] = "ep0";
 121
 122 static const char *const ep_name [] = {
 123         ep0name,                                /* everyone has ep0 */
 124
 125         /* act like a net2280: high speed, six configurable endpoints */
 126         "ep-a", "ep-b", "ep-c", "ep-d", "ep-e", "ep-f",
 127
 128         /* or like pxa250: fifteen fixed function endpoints */
 129         "ep1in-bulk", "ep2out-bulk", "ep3in-iso", "ep4out-iso", "ep5in-int",
 130         "ep6in-bulk", "ep7out-bulk", "ep8in-iso", "ep9out-iso", "ep10in-int",
 131         "ep11in-bulk", "ep12out-bulk", "ep13in-iso", "ep14out-iso",
 132                 "ep15in-int",
 133
 134         /* or like sa1100: two fixed function endpoints */
 135         "ep1out-bulk", "ep2in-bulk",
 136 };
 137 #define DUMMY_ENDPOINTS ARRAY_SIZE(ep_name)
 138
 139 /*-------------------------------------------------------------------------*/
 140
 141 #define FIFO_SIZE               64
 142
 143 struct urbp {
 144         struct urb              *urb;
 145         struct list_head        urbp_list;
 146 };
 147
 148
 149 enum dummy_rh_state {
 150         DUMMY_RH_RESET,
 151         DUMMY_RH_SUSPENDED,
 152         DUMMY_RH_RUNNING
 153 };
 154
 155 struct dummy {
 156         spinlock_t                      lock;
 157
 158         /*
 159          * SLAVE/GADGET side support
 160          */
 161         struct dummy_ep                 ep [DUMMY_ENDPOINTS];
 162         int                             address;
 163         struct usb_gadget               gadget;
 164         struct usb_gadget_driver        *driver;
 165         struct dummy_request            fifo_req;
 166         u8                              fifo_buf [FIFO_SIZE];
 167         u16                             devstatus;
 168         unsigned                        udc_suspended:1;
 169         unsigned                        pullup:1;
 170         unsigned                        active:1;
 171         unsigned                        old_active:1;
 172
 173         /*
 174          * MASTER/HOST side support
 175          */
 176         enum dummy_rh_state             rh_state;
 177         struct timer_list               timer;
 178         u32                             port_status;
 179         u32                             old_status;
 180         unsigned                        resuming:1;
 181         unsigned long                   re_timeout;
 182
 183         struct usb_device               *udev;
 184         struct list_head                urbp_list;
 185 };
 186
 187 static inline struct dummy *hcd_to_dummy (struct usb_hcd *hcd)
 188 {
 189         return (struct dummy *) (hcd->hcd_priv);
 190 }
 191
 192 static inline struct usb_hcd *dummy_to_hcd (struct dummy *dum)
 193 {
 194         return container_of((void *) dum, struct usb_hcd, hcd_priv);
 195 }
 196
 197 static inline struct device *dummy_dev (struct dummy *dum)
 198 {
 199         return dummy_to_hcd(dum)->self.controller;
 200 }
 201
 202 static inline struct device *udc_dev (struct dummy *dum)
 203 {
 204         return dum->gadget.dev.parent;
 205 }
 206
 207 static inline struct dummy *ep_to_dummy (struct dummy_ep *ep)
 208 {
 209         return container_of (ep->gadget, struct dummy, gadget);
 210 }
 211
 212 static inline struct dummy *gadget_to_dummy (struct usb_gadget *gadget)
 213 {
 214         return container_of (gadget, struct dummy, gadget);
 215 }
 216
 217 static inline struct dummy *gadget_dev_to_dummy (struct device *dev)
 218 {
 219         return container_of (dev, struct dummy, gadget.dev);
 220 }
 221
 222 static struct dummy                     *the_controller;
 223
 224 /*-------------------------------------------------------------------------*/
 225
 226 /* SLAVE/GADGET SIDE UTILITY ROUTINES */
 227
 228 /* called with spinlock held */
 229 static void nuke (struct dummy *dum, struct dummy_ep *ep)
 230 {
 231         while (!list_empty (&ep->queue)) {
 232                 struct dummy_request    *req;
 233
 234                 req = list_entry (ep->queue.next, struct dummy_request, queue);
 235                 list_del_init (&req->queue);
 236                 req->req.status = -ESHUTDOWN;
 237
 238                 spin_unlock (&dum->lock);
 239                 req->req.complete (&ep->ep, &req->req);
 240                 spin_lock (&dum->lock);
 241         }
 242 }
 243
 244 /* caller must hold lock */
 245 static void
 246 stop_activity (struct dummy *dum)
 247 {
 248         struct dummy_ep *ep;
 249
 250         /* prevent any more requests */
 251         dum->address = 0;
 252
 253         /* The timer is left running so that outstanding URBs can fail */
 254
 255         /* nuke any pending requests first, so driver i/o is quiesced */
 256         list_for_each_entry (ep, &dum->gadget.ep_list, ep.ep_list)
 257                 nuke (dum, ep);
 258
 259         /* driver now does any non-usb quiescing necessary */
 260 }
 261
 262 /* caller must hold lock */
 263 static void
 264 set_link_state (struct dummy *dum)
 265 {
 266         dum->active = 0;
 267         if ((dum->port_status & USB_PORT_STAT_POWER) == 0)
 268                 dum->port_status = 0;
 269
 270         /* UDC suspend must cause a disconnect */
 271         else if (!dum->pullup || dum->udc_suspended) {
 272                 dum->port_status &= ~(USB_PORT_STAT_CONNECTION |
 273                                         USB_PORT_STAT_ENABLE |
 274                                         USB_PORT_STAT_LOW_SPEED |
 275                                         USB_PORT_STAT_HIGH_SPEED |
 276                                         USB_PORT_STAT_SUSPEND);
 277                 if ((dum->old_status & USB_PORT_STAT_CONNECTION) != 0)
 278                         dum->port_status |= (USB_PORT_STAT_C_CONNECTION << 16);
 279         } else {
 280                 dum->port_status |= USB_PORT_STAT_CONNECTION;
 281                 if ((dum->old_status & USB_PORT_STAT_CONNECTION) == 0)
 282                         dum->port_status |= (USB_PORT_STAT_C_CONNECTION << 16);
 283                 if ((dum->port_status & USB_PORT_STAT_ENABLE) == 0)
 284                         dum->port_status &= ~USB_PORT_STAT_SUSPEND;
 285                 else if ((dum->port_status & USB_PORT_STAT_SUSPEND) == 0 &&
 286                                 dum->rh_state != DUMMY_RH_SUSPENDED)
 287                         dum->active = 1;
 288         }
 289
 290         if ((dum->port_status & USB_PORT_STAT_ENABLE) == 0 || dum->active)
 291                 dum->resuming = 0;
 292
 293         if ((dum->port_status & USB_PORT_STAT_CONNECTION) == 0 ||
 294                         (dum->port_status & USB_PORT_STAT_RESET) != 0) {
 295                 if ((dum->old_status & USB_PORT_STAT_CONNECTION) != 0 &&
 296                                 (dum->old_status & USB_PORT_STAT_RESET) == 0 &&
 297                                 dum->driver) {
 298                         stop_activity (dum);
 299                         spin_unlock (&dum->lock);
 300                         dum->driver->disconnect (&dum->gadget);
 301                         spin_lock (&dum->lock);
 302                 }
 303         } else if (dum->active != dum->old_active) {
 304                 if (dum->old_active && dum->driver->suspend) {
 305                         spin_unlock (&dum->lock);
 306                         dum->driver->suspend (&dum->gadget);
 307                         spin_lock (&dum->lock);
 308                 } else if (!dum->old_active && dum->driver->resume) {
 309                         spin_unlock (&dum->lock);
 310                         dum->driver->resume (&dum->gadget);
 311                         spin_lock (&dum->lock);
 312                 }
 313         }
 314
 315         dum->old_status = dum->port_status;
 316         dum->old_active = dum->active;
 317 }
 318
 319 /*-------------------------------------------------------------------------*/
 320
 321 /* SLAVE/GADGET SIDE DRIVER
 322  *
 323  * This only tracks gadget state.  All the work is done when the host
 324  * side tries some (emulated) i/o operation.  Real device controller
 325  * drivers would do real i/o using dma, fifos, irqs, timers, etc.
 326  */
 327
 328 #define is_enabled(dum) \
 329         (dum->port_status & USB_PORT_STAT_ENABLE)
 330
 331 static int
 332 dummy_enable (struct usb_ep *_ep, const struct usb_endpoint_descriptor *desc)
 333 {
 334         struct dummy            *dum;
 335         struct dummy_ep         *ep;
 336         unsigned                max;
 337         int                     retval;
 338
 339         ep = usb_ep_to_dummy_ep (_ep);
 340         if (!_ep || !desc || ep->desc || _ep->name == ep0name
 341                         || desc->bDescriptorType != USB_DT_ENDPOINT)
 342                 return -EINVAL;
 343         dum = ep_to_dummy (ep);
 344         if (!dum->driver || !is_enabled (dum))
 345                 return -ESHUTDOWN;
 346         max = le16_to_cpu(desc->wMaxPacketSize) & 0x3ff;
 347
 348         /* drivers must not request bad settings, since lower levels
 349          * (hardware or its drivers) may not check.  some endpoints
 350          * can't do iso, many have maxpacket limitations, etc.
 351          *
 352          * since this "hardware" driver is here to help debugging, we
 353          * have some extra sanity checks.  (there could be more though,
 354          * especially for "ep9out" style fixed function ones.)
 355          */
 356         retval = -EINVAL;
 357         switch (desc->bmAttributes & 0x03) {
 358         case USB_ENDPOINT_XFER_BULK:
 359                 if (strstr (ep->ep.name, "-iso")
 360                                 || strstr (ep->ep.name, "-int")) {
 361                         goto done;
 362                 }
 363                 switch (dum->gadget.speed) {
 364                 case USB_SPEED_HIGH:
 365                         if (max == 512)
 366                                 break;
 367                         goto done;
 368                 case USB_SPEED_FULL:
 369                         if (max == 8 || max == 16 || max == 32 || max == 64)
 370                                 /* we'll fake any legal size */
 371                                 break;
 372                         /* save a return statement */
 373                 default:
 374                         goto done;
 375                 }
 376                 break;
 377         case USB_ENDPOINT_XFER_INT:
 378                 if (strstr (ep->ep.name, "-iso")) /* bulk is ok */
 379                         goto done;
 380                 /* real hardware might not handle all packet sizes */
 381                 switch (dum->gadget.speed) {
 382                 case USB_SPEED_HIGH:
 383                         if (max <= 1024)
 384                                 break;
 385                         /* save a return statement */
 386                 case USB_SPEED_FULL:
 387                         if (max <= 64)
 388                                 break;
 389                         /* save a return statement */
 390                 default:
 391                         if (max <= 8)
 392                                 break;
 393                         goto done;
 394                 }
 395                 break;
 396         case USB_ENDPOINT_XFER_ISOC:
 397                 if (strstr (ep->ep.name, "-bulk")
 398                                 || strstr (ep->ep.name, "-int"))
 399                         goto done;
 400                 /* real hardware might not handle all packet sizes */
 401                 switch (dum->gadget.speed) {
 402                 case USB_SPEED_HIGH:
 403                         if (max <= 1024)
 404                                 break;
 405                         /* save a return statement */
 406                 case USB_SPEED_FULL:
 407                         if (max <= 1023)
 408                                 break;
 409                         /* save a return statement */
 410                 default:
 411                         goto done;
 412                 }
 413                 break;
 414         default:
 415                 /* few chips support control except on ep0 */
 416                 goto done;
 417         }
 418
 419         _ep->maxpacket = max;
 420         ep->desc = desc;
 421
 422         dev_dbg (udc_dev(dum), "enabled %s (ep%d%s-%s) maxpacket %d\n",
 423                 _ep->name,
 424                 desc->bEndpointAddress & 0x0f,
 425                 (desc->bEndpointAddress & USB_DIR_IN) ? "in" : "out",
 426                 ({ char *val;
 427                  switch (desc->bmAttributes & 0x03) {
 428                  case USB_ENDPOINT_XFER_BULK: val = "bulk"; break;
 429                  case USB_ENDPOINT_XFER_ISOC: val = "iso"; break;
 430                  case USB_ENDPOINT_XFER_INT: val = "intr"; break;
 431                  default: val = "ctrl"; break;
 432                  }; val; }),
 433                 max);
 434
 435         /* at this point real hardware should be NAKing transfers
 436          * to that endpoint, until a buffer is queued to it.
 437          */
 438         ep->halted = ep->wedged = 0;
 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                 list_add_tail(&req->queue, &ep->queue);
 546                 spin_unlock (&dum->lock);
 547                 _req->actual = _req->length;
 548                 _req->status = 0;
 549                 _req->complete (_ep, _req);
 550                 spin_lock (&dum->lock);
 551         }  else
 552                 list_add_tail(&req->queue, &ep->queue);
 553         spin_unlock_irqrestore (&dum->lock, flags);
 554
 555         /* real hardware would likely enable transfers here, in case
 556          * it'd been left NAKing.
 557          */
 558         return 0;
 559 }
 560
 561 static int dummy_dequeue (struct usb_ep *_ep, struct usb_request *_req)
 562 {
 563         struct dummy_ep         *ep;
 564         struct dummy            *dum;
 565         int                     retval = -EINVAL;
 566         unsigned long           flags;
 567         struct dummy_request    *req = NULL;
 568
 569         if (!_ep || !_req)
 570                 return retval;
 571         ep = usb_ep_to_dummy_ep (_ep);
 572         dum = ep_to_dummy (ep);
 573
 574         if (!dum->driver)
 575                 return -ESHUTDOWN;
 576
 577         local_irq_save (flags);
 578         spin_lock (&dum->lock);
 579         list_for_each_entry (req, &ep->queue, queue) {
 580                 if (&req->req == _req) {
 581                         list_del_init (&req->queue);
 582                         _req->status = -ECONNRESET;
 583                         retval = 0;
 584                         break;
 585                 }
 586         }
 587         spin_unlock (&dum->lock);
 588
 589         if (retval == 0) {
 590                 dev_dbg (udc_dev(dum),
 591                                 "dequeued req %p from %s, len %d buf %p\n",
 592                                 req, _ep->name, _req->length, _req->buf);
 593                 _req->complete (_ep, _req);
 594         }
 595         local_irq_restore (flags);
 596         return retval;
 597 }
 598
 599 static int
 600 dummy_set_halt_and_wedge(struct usb_ep *_ep, int value, int wedged)
 601 {
 602         struct dummy_ep         *ep;
 603         struct dummy            *dum;
 604
 605         if (!_ep)
 606                 return -EINVAL;
 607         ep = usb_ep_to_dummy_ep (_ep);
 608         dum = ep_to_dummy (ep);
 609         if (!dum->driver)
 610                 return -ESHUTDOWN;
 611         if (!value)
 612                 ep->halted = ep->wedged = 0;
 613         else if (ep->desc && (ep->desc->bEndpointAddress & USB_DIR_IN) &&
 614                         !list_empty (&ep->queue))
 615                 return -EAGAIN;
 616         else {
 617                 ep->halted = 1;
 618                 if (wedged)
 619                         ep->wedged = 1;
 620         }
 621         /* FIXME clear emulated data toggle too */
 622         return 0;
 623 }
 624
 625 static int
 626 dummy_set_halt(struct usb_ep *_ep, int value)
 627 {
 628         return dummy_set_halt_and_wedge(_ep, value, 0);
 629 }
 630
 631 static int dummy_set_wedge(struct usb_ep *_ep)
 632 {
 633         if (!_ep || _ep->name == ep0name)
 634                 return -EINVAL;
 635         return dummy_set_halt_and_wedge(_ep, 1, 1);
 636 }
 637
 638 static const struct usb_ep_ops dummy_ep_ops = {
 639         .enable         = dummy_enable,
 640         .disable        = dummy_disable,
 641
 642         .alloc_request  = dummy_alloc_request,
 643         .free_request   = dummy_free_request,
 644
 645         .queue          = dummy_queue,
 646         .dequeue        = dummy_dequeue,
 647
 648         .set_halt       = dummy_set_halt,
 649         .set_wedge      = dummy_set_wedge,
 650 };
 651
 652 /*-------------------------------------------------------------------------*/
 653
 654 /* there are both host and device side versions of this call ... */
 655 static int dummy_g_get_frame (struct usb_gadget *_gadget)
 656 {
 657         struct timeval  tv;
 658
 659         do_gettimeofday (&tv);
 660         return tv.tv_usec / 1000;
 661 }
 662
 663 static int dummy_wakeup (struct usb_gadget *_gadget)
 664 {
 665         struct dummy    *dum;
 666
 667         dum = gadget_to_dummy (_gadget);
 668         if (!(dum->devstatus &  ( (1 << USB_DEVICE_B_HNP_ENABLE)
 669                                 | (1 << USB_DEVICE_REMOTE_WAKEUP))))
 670                 return -EINVAL;
 671         if ((dum->port_status & USB_PORT_STAT_CONNECTION) == 0)
 672                 return -ENOLINK;
 673         if ((dum->port_status & USB_PORT_STAT_SUSPEND) == 0 &&
 674                          dum->rh_state != DUMMY_RH_SUSPENDED)
 675                 return -EIO;
 676
 677         /* FIXME: What if the root hub is suspended but the port isn't? */
 678
 679         /* hub notices our request, issues downstream resume, etc */
 680         dum->resuming = 1;
 681         dum->re_timeout = jiffies + msecs_to_jiffies(20);
 682         mod_timer (&dummy_to_hcd (dum)->rh_timer, dum->re_timeout);
 683         return 0;
 684 }
 685
 686 static int dummy_set_selfpowered (struct usb_gadget *_gadget, int value)
 687 {
 688         struct dummy    *dum;
 689
 690         dum = gadget_to_dummy (_gadget);
 691         if (value)
 692                 dum->devstatus |= (1 << USB_DEVICE_SELF_POWERED);
 693         else
 694                 dum->devstatus &= ~(1 << USB_DEVICE_SELF_POWERED);
 695         return 0;
 696 }
 697
 698 static int dummy_pullup (struct usb_gadget *_gadget, int value)
 699 {
 700         struct dummy    *dum;
 701         unsigned long   flags;
 702
 703         dum = gadget_to_dummy (_gadget);
 704         spin_lock_irqsave (&dum->lock, flags);
 705         dum->pullup = (value != 0);
 706         set_link_state (dum);
 707         spin_unlock_irqrestore (&dum->lock, flags);
 708
 709         usb_hcd_poll_rh_status (dummy_to_hcd (dum));
 710         return 0;
 711 }
 712
 713 static const struct usb_gadget_ops dummy_ops = {
 714         .get_frame      = dummy_g_get_frame,
 715         .wakeup         = dummy_wakeup,
 716         .set_selfpowered = dummy_set_selfpowered,
 717         .pullup         = dummy_pullup,
 718 };
 719
 720 /*-------------------------------------------------------------------------*/
 721
 722 /* "function" sysfs attribute */
 723 static ssize_t
 724 show_function (struct device *dev, struct device_attribute *attr, char *buf)
 725 {
 726         struct dummy    *dum = gadget_dev_to_dummy (dev);
 727
 728         if (!dum->driver || !dum->driver->function)
 729                 return 0;
 730         return scnprintf (buf, PAGE_SIZE, "%s\n", dum->driver->function);
 731 }
 732 static DEVICE_ATTR (function, S_IRUGO, show_function, NULL);
 733
 734 /*-------------------------------------------------------------------------*/
 735
 736 /*
 737  * Driver registration/unregistration.
 738  *
 739  * This is basically hardware-specific; there's usually only one real USB
 740  * device (not host) controller since that's how USB devices are intended
 741  * to work.  So most implementations of these api calls will rely on the
 742  * fact that only one driver will ever bind to the hardware.  But curious
 743  * hardware can be built with discrete components, so the gadget API doesn't
 744  * require that assumption.
 745  *
 746  * For this emulator, it might be convenient to create a usb slave device
 747  * for each driver that registers:  just add to a big root hub.
 748  */
 749
 750 int
 751 usb_gadget_register_driver (struct usb_gadget_driver *driver)
 752 {
 753         struct dummy    *dum = the_controller;
 754         int             retval, i;
 755
 756         if (!dum)
 757                 return -EINVAL;
 758         if (dum->driver)
 759                 return -EBUSY;
 760         if (!driver->bind || !driver->setup
 761                         || driver->speed == USB_SPEED_UNKNOWN)
 762                 return -EINVAL;
 763
 764         /*
 765          * SLAVE side init ... the layer above hardware, which
 766          * can't enumerate without help from the driver we're binding.
 767          */
 768
 769         dum->devstatus = 0;
 770
 771         INIT_LIST_HEAD (&dum->gadget.ep_list);
 772         for (i = 0; i < DUMMY_ENDPOINTS; i++) {
 773                 struct dummy_ep *ep = &dum->ep [i];
 774
 775                 if (!ep_name [i])
 776                         break;
 777                 ep->ep.name = ep_name [i];
 778                 ep->ep.ops = &dummy_ep_ops;
 779                 list_add_tail (&ep->ep.ep_list, &dum->gadget.ep_list);
 780                 ep->halted = ep->wedged = ep->already_seen =
 781                                 ep->setup_stage = 0;
 782                 ep->ep.maxpacket = ~0;
 783                 ep->last_io = jiffies;
 784                 ep->gadget = &dum->gadget;
 785                 ep->desc = NULL;
 786                 INIT_LIST_HEAD (&ep->queue);
 787         }
 788
 789         dum->gadget.ep0 = &dum->ep [0].ep;
 790         dum->ep [0].ep.maxpacket = 64;
 791         list_del_init (&dum->ep [0].ep.ep_list);
 792         INIT_LIST_HEAD(&dum->fifo_req.queue);
 793
 794         driver->driver.bus = NULL;
 795         dum->driver = driver;
 796         dum->gadget.dev.driver = &driver->driver;
 797         dev_dbg (udc_dev(dum), "binding gadget driver '%s'\n",
 798                         driver->driver.name);
 799         retval = driver->bind(&dum->gadget);
 800         if (retval) {
 801                 dum->driver = NULL;
 802                 dum->gadget.dev.driver = NULL;
 803                 return retval;
 804         }
 805
 806         /* khubd will enumerate this in a while */
 807         spin_lock_irq (&dum->lock);
 808         dum->pullup = 1;
 809         set_link_state (dum);
 810         spin_unlock_irq (&dum->lock);
 811
 812         usb_hcd_poll_rh_status (dummy_to_hcd (dum));
 813         return 0;
 814 }
 815 EXPORT_SYMBOL (usb_gadget_register_driver);
 816
 817 int
 818 usb_gadget_unregister_driver (struct usb_gadget_driver *driver)
 819 {
 820         struct dummy    *dum = the_controller;
 821         unsigned long   flags;
 822
 823         if (!dum)
 824                 return -ENODEV;
 825         if (!driver || driver != dum->driver || !driver->unbind)
 826                 return -EINVAL;
 827
 828         dev_dbg (udc_dev(dum), "unregister gadget driver '%s'\n",
 829                         driver->driver.name);
 830
 831         spin_lock_irqsave (&dum->lock, flags);
 832         dum->pullup = 0;
 833         set_link_state (dum);
 834         spin_unlock_irqrestore (&dum->lock, flags);
 835
 836         driver->unbind (&dum->gadget);
 837         dum->gadget.dev.driver = NULL;
 838         dum->driver = NULL;
 839
 840         spin_lock_irqsave (&dum->lock, flags);
 841         dum->pullup = 0;
 842         set_link_state (dum);
 843         spin_unlock_irqrestore (&dum->lock, flags);
 844
 845         usb_hcd_poll_rh_status (dummy_to_hcd (dum));
 846         return 0;
 847 }
 848 EXPORT_SYMBOL (usb_gadget_unregister_driver);
 849
 850 #undef is_enabled
 851
 852 /* just declare this in any driver that really need it */
 853 extern int net2280_set_fifo_mode (struct usb_gadget *gadget, int mode);
 854
 855 int net2280_set_fifo_mode (struct usb_gadget *gadget, int mode)
 856 {
 857         return -ENOSYS;
 858 }
 859 EXPORT_SYMBOL (net2280_set_fifo_mode);
 860
 861
 862 /* The gadget structure is stored inside the hcd structure and will be
 863  * released along with it. */
 864 static void
 865 dummy_gadget_release (struct device *dev)
 866 {
 867         struct dummy    *dum = gadget_dev_to_dummy (dev);
 868
 869         usb_put_hcd (dummy_to_hcd (dum));
 870 }
 871
 872 static int dummy_udc_probe (struct platform_device *pdev)
 873 {
 874         struct dummy    *dum = the_controller;
 875         int             rc;
 876
 877         dum->gadget.name = gadget_name;
 878         dum->gadget.ops = &dummy_ops;
 879         dum->gadget.is_dualspeed = 1;
 880
 881         /* maybe claim OTG support, though we won't complete HNP */
 882         dum->gadget.is_otg = (dummy_to_hcd(dum)->self.otg_port != 0);
 883
 884         dev_set_name(&dum->gadget.dev, "gadget");
 885         dum->gadget.dev.parent = &pdev->dev;
 886         dum->gadget.dev.release = dummy_gadget_release;
 887         rc = device_register (&dum->gadget.dev);
 888         if (rc < 0)
 889                 return rc;
 890
 891         usb_get_hcd (dummy_to_hcd (dum));
 892
 893         platform_set_drvdata (pdev, dum);
 894         rc = device_create_file (&dum->gadget.dev, &dev_attr_function);
 895         if (rc < 0)
 896                 device_unregister (&dum->gadget.dev);
 897         return rc;
 898 }
 899
 900 static int dummy_udc_remove (struct platform_device *pdev)
 901 {
 902         struct dummy    *dum = platform_get_drvdata (pdev);
 903
 904         platform_set_drvdata (pdev, NULL);
 905         device_remove_file (&dum->gadget.dev, &dev_attr_function);
 906         device_unregister (&dum->gadget.dev);
 907         return 0;
 908 }
 909
 910 static int dummy_udc_suspend (struct platform_device *pdev, pm_message_t state)
 911 {
 912         struct dummy    *dum = platform_get_drvdata(pdev);
 913
 914         dev_dbg (&pdev->dev, "%s\n", __func__);
 915         spin_lock_irq (&dum->lock);
 916         dum->udc_suspended = 1;
 917         set_link_state (dum);
 918         spin_unlock_irq (&dum->lock);
 919
 920         usb_hcd_poll_rh_status (dummy_to_hcd (dum));
 921         return 0;
 922 }
 923
 924 static int dummy_udc_resume (struct platform_device *pdev)
 925 {
 926         struct dummy    *dum = platform_get_drvdata(pdev);
 927
 928         dev_dbg (&pdev->dev, "%s\n", __func__);
 929         spin_lock_irq (&dum->lock);
 930         dum->udc_suspended = 0;
 931         set_link_state (dum);
 932         spin_unlock_irq (&dum->lock);
 933
 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 urb                      *urb,
 966         gfp_t                           mem_flags
 967 ) {
 968         struct dummy    *dum;
 969         struct urbp     *urbp;
 970         unsigned long   flags;
 971         int             rc;
 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         rc = usb_hcd_link_urb_to_ep(hcd, urb);
 984         if (rc) {
 985                 kfree(urbp);
 986                 goto done;
 987         }
 988
 989         if (!dum->udev) {
 990                 dum->udev = urb->dev;
 991                 usb_get_dev (dum->udev);
 992         } else if (unlikely (dum->udev != urb->dev))
 993                 dev_err (dummy_dev(dum), "usb_device address has changed!\n");
 994
 995         list_add_tail (&urbp->urbp_list, &dum->urbp_list);
 996         urb->hcpriv = urbp;
 997         if (usb_pipetype (urb->pipe) == PIPE_CONTROL)
 998                 urb->error_count = 1;           /* mark as a new urb */
 999
1000         /* kick the scheduler, it'll do the rest */
1001         if (!timer_pending (&dum->timer))
1002                 mod_timer (&dum->timer, jiffies + 1);
1003
1004  done:
1005         spin_unlock_irqrestore(&dum->lock, flags);
1006         return rc;
1007 }
1008
1009 static int dummy_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
1010 {
1011         struct dummy    *dum;
1012         unsigned long   flags;
1013         int             rc;
1014
1015         /* giveback happens automatically in timer callback,
1016          * so make sure the callback happens */
1017         dum = hcd_to_dummy (hcd);
1018         spin_lock_irqsave (&dum->lock, flags);
1019
1020         rc = usb_hcd_check_unlink_urb(hcd, urb, status);
1021         if (!rc && dum->rh_state != DUMMY_RH_RUNNING &&
1022                         !list_empty(&dum->urbp_list))
1023                 mod_timer (&dum->timer, jiffies);
1024
1025         spin_unlock_irqrestore (&dum->lock, flags);
1026         return rc;
1027 }
1028
1029 /* transfer up to a frame's worth; caller must own lock */
1030 static int
1031 transfer(struct dummy *dum, struct urb *urb, struct dummy_ep *ep, int limit,
1032                 int *status)
1033 {
1034         struct dummy_request    *req;
1035
1036 top:
1037         /* if there's no request queued, the device is NAKing; return */
1038         list_for_each_entry (req, &ep->queue, queue) {
1039                 unsigned        host_len, dev_len, len;
1040                 int             is_short, to_host;
1041                 int             rescan = 0;
1042
1043                 /* 1..N packets of ep->ep.maxpacket each ... the last one
1044                  * may be short (including zero length).
1045                  *
1046                  * writer can send a zlp explicitly (length 0) or implicitly
1047                  * (length mod maxpacket zero, and 'zero' flag); they always
1048                  * terminate reads.
1049                  */
1050                 host_len = urb->transfer_buffer_length - urb->actual_length;
1051                 dev_len = req->req.length - req->req.actual;
1052                 len = min (host_len, dev_len);
1053
1054                 /* FIXME update emulated data toggle too */
1055
1056                 to_host = usb_pipein (urb->pipe);
1057                 if (unlikely (len == 0))
1058                         is_short = 1;
1059                 else {
1060                         char            *ubuf, *rbuf;
1061
1062                         /* not enough bandwidth left? */
1063                         if (limit < ep->ep.maxpacket && limit < len)
1064                                 break;
1065                         len = min (len, (unsigned) limit);
1066                         if (len == 0)
1067                                 break;
1068
1069                         /* use an extra pass for the final short packet */
1070                         if (len > ep->ep.maxpacket) {
1071                                 rescan = 1;
1072                                 len -= (len % ep->ep.maxpacket);
1073                         }
1074                         is_short = (len % ep->ep.maxpacket) != 0;
1075
1076                         /* else transfer packet(s) */
1077                         ubuf = urb->transfer_buffer + urb->actual_length;
1078                         rbuf = req->req.buf + req->req.actual;
1079                         if (to_host)
1080                                 memcpy (ubuf, rbuf, len);
1081                         else
1082                                 memcpy (rbuf, ubuf, len);
1083                         ep->last_io = jiffies;
1084
1085                         limit -= len;
1086                         urb->actual_length += len;
1087                         req->req.actual += len;
1088                 }
1089
1090                 /* short packets terminate, maybe with overflow/underflow.
1091                  * it's only really an error to write too much.
1092                  *
1093                  * partially filling a buffer optionally blocks queue advances
1094                  * (so completion handlers can clean up the queue) but we don't
1095                  * need to emulate such data-in-flight.
1096                  */
1097                 if (is_short) {
1098                         if (host_len == dev_len) {
1099                                 req->req.status = 0;
1100                                 *status = 0;
1101                         } else if (to_host) {
1102                                 req->req.status = 0;
1103                                 if (dev_len > host_len)
1104                                         *status = -EOVERFLOW;
1105                                 else
1106                                         *status = 0;
1107                         } else if (!to_host) {
1108                                 *status = 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                                 *status = 0;
1124                 }
1125
1126                 /* device side completion --> continuable */
1127                 if (req->req.status != -EINPROGRESS) {
1128                         list_del_init (&req->queue);
1129
1130                         spin_unlock (&dum->lock);
1131                         req->req.complete (&ep->ep, &req->req);
1132                         spin_lock (&dum->lock);
1133
1134                         /* requests might have been unlinked... */
1135                         rescan = 1;
1136                 }
1137
1138                 /* host side completion --> terminate */
1139                 if (*status != -EINPROGRESS)
1140                         break;
1141
1142                 /* rescan to continue with any other queued i/o */
1143                 if (rescan)
1144                         goto top;
1145         }
1146         return limit;
1147 }
1148
1149 static int periodic_bytes (struct dummy *dum, struct dummy_ep *ep)
1150 {
1151         int     limit = ep->ep.maxpacket;
1152
1153         if (dum->gadget.speed == USB_SPEED_HIGH) {
1154                 int     tmp;
1155
1156                 /* high bandwidth mode */
1157                 tmp = le16_to_cpu(ep->desc->wMaxPacketSize);
1158                 tmp = (tmp >> 11) & 0x03;
1159                 tmp *= 8 /* applies to entire frame */;
1160                 limit += limit * tmp;
1161         }
1162         return limit;
1163 }
1164
1165 #define is_active(dum)  ((dum->port_status & \
1166                 (USB_PORT_STAT_CONNECTION | USB_PORT_STAT_ENABLE | \
1167                         USB_PORT_STAT_SUSPEND)) \
1168                 == (USB_PORT_STAT_CONNECTION | USB_PORT_STAT_ENABLE))
1169
1170 static struct dummy_ep *find_endpoint (struct dummy *dum, u8 address)
1171 {
1172         int             i;
1173
1174         if (!is_active (dum))
1175                 return NULL;
1176         if ((address & ~USB_DIR_IN) == 0)
1177                 return &dum->ep [0];
1178         for (i = 1; i < DUMMY_ENDPOINTS; i++) {
1179                 struct dummy_ep *ep = &dum->ep [i];
1180
1181                 if (!ep->desc)
1182                         continue;
1183                 if (ep->desc->bEndpointAddress == address)
1184                         return ep;
1185         }
1186         return NULL;
1187 }
1188
1189 #undef is_active
1190
1191 #define Dev_Request     (USB_TYPE_STANDARD | USB_RECIP_DEVICE)
1192 #define Dev_InRequest   (Dev_Request | USB_DIR_IN)
1193 #define Intf_Request    (USB_TYPE_STANDARD | USB_RECIP_INTERFACE)
1194 #define Intf_InRequest  (Intf_Request | USB_DIR_IN)
1195 #define Ep_Request      (USB_TYPE_STANDARD | USB_RECIP_ENDPOINT)
1196 #define Ep_InRequest    (Ep_Request | USB_DIR_IN)
1197
1198 /* drive both sides of the transfers; looks like irq handlers to
1199  * both drivers except the callbacks aren't in_irq().
1200  */
1201 static void dummy_timer (unsigned long _dum)
1202 {
1203         struct dummy            *dum = (struct dummy *) _dum;
1204         struct urbp             *urbp, *tmp;
1205         unsigned long           flags;
1206         int                     limit, total;
1207         int                     i;
1208
1209         /* simplistic model for one frame's bandwidth */
1210         switch (dum->gadget.speed) {
1211         case USB_SPEED_LOW:
1212                 total = 8/*bytes*/ * 12/*packets*/;
1213                 break;
1214         case USB_SPEED_FULL:
1215                 total = 64/*bytes*/ * 19/*packets*/;
1216                 break;
1217         case USB_SPEED_HIGH:
1218                 total = 512/*bytes*/ * 13/*packets*/ * 8/*uframes*/;
1219                 break;
1220         default:
1221                 dev_err (dummy_dev(dum), "bogus device speed\n");
1222                 return;
1223         }
1224
1225         /* FIXME if HZ != 1000 this will probably misbehave ... */
1226
1227         /* look at each urb queued by the host side driver */
1228         spin_lock_irqsave (&dum->lock, flags);
1229
1230         if (!dum->udev) {
1231                 dev_err (dummy_dev(dum),
1232                                 "timer fired with no URBs pending?\n");
1233                 spin_unlock_irqrestore (&dum->lock, flags);
1234                 return;
1235         }
1236
1237         for (i = 0; i < DUMMY_ENDPOINTS; i++) {
1238                 if (!ep_name [i])
1239                         break;
1240                 dum->ep [i].already_seen = 0;
1241         }
1242
1243 restart:
1244         list_for_each_entry_safe (urbp, tmp, &dum->urbp_list, urbp_list) {
1245                 struct urb              *urb;
1246                 struct dummy_request    *req;
1247                 u8                      address;
1248                 struct dummy_ep         *ep = NULL;
1249                 int                     type;
1250                 int                     status = -EINPROGRESS;
1251
1252                 urb = urbp->urb;
1253                 if (urb->unlinked)
1254                         goto return_urb;
1255                 else if (dum->rh_state != DUMMY_RH_RUNNING)
1256                         continue;
1257                 type = usb_pipetype (urb->pipe);
1258
1259                 /* used up this frame's non-periodic bandwidth?
1260                  * FIXME there's infinite bandwidth for control and
1261                  * periodic transfers ... unrealistic.
1262                  */
1263                 if (total <= 0 && type == PIPE_BULK)
1264                         continue;
1265
1266                 /* find the gadget's ep for this request (if configured) */
1267                 address = usb_pipeendpoint (urb->pipe);
1268                 if (usb_pipein (urb->pipe))
1269                         address |= USB_DIR_IN;
1270                 ep = find_endpoint(dum, address);
1271                 if (!ep) {
1272                         /* set_configuration() disagreement */
1273                         dev_dbg (dummy_dev(dum),
1274                                 "no ep configured for urb %p\n",
1275                                 urb);
1276                         status = -EPROTO;
1277                         goto return_urb;
1278                 }
1279
1280                 if (ep->already_seen)
1281                         continue;
1282                 ep->already_seen = 1;
1283                 if (ep == &dum->ep [0] && urb->error_count) {
1284                         ep->setup_stage = 1;    /* a new urb */
1285                         urb->error_count = 0;
1286                 }
1287                 if (ep->halted && !ep->setup_stage) {
1288                         /* NOTE: must not be iso! */
1289                         dev_dbg (dummy_dev(dum), "ep %s halted, urb %p\n",
1290                                         ep->ep.name, urb);
1291                         status = -EPIPE;
1292                         goto return_urb;
1293                 }
1294                 /* FIXME make sure both ends agree on maxpacket */
1295
1296                 /* handle control requests */
1297                 if (ep == &dum->ep [0] && ep->setup_stage) {
1298                         struct usb_ctrlrequest          setup;
1299                         int                             value = 1;
1300                         struct dummy_ep                 *ep2;
1301                         unsigned                        w_index;
1302                         unsigned                        w_value;
1303
1304                         setup = *(struct usb_ctrlrequest*) urb->setup_packet;
1305                         w_index = le16_to_cpu(setup.wIndex);
1306                         w_value = le16_to_cpu(setup.wValue);
1307
1308                         /* paranoia, in case of stale queued data */
1309                         list_for_each_entry (req, &ep->queue, queue) {
1310                                 list_del_init (&req->queue);
1311                                 req->req.status = -EOVERFLOW;
1312                                 dev_dbg (udc_dev(dum), "stale req = %p\n",
1313                                                 req);
1314
1315                                 spin_unlock (&dum->lock);
1316                                 req->req.complete (&ep->ep, &req->req);
1317                                 spin_lock (&dum->lock);
1318                                 ep->already_seen = 0;
1319                                 goto restart;
1320                         }
1321
1322                         /* gadget driver never sees set_address or operations
1323                          * on standard feature flags.  some hardware doesn't
1324                          * even expose them.
1325                          */
1326                         ep->last_io = jiffies;
1327                         ep->setup_stage = 0;
1328                         ep->halted = 0;
1329                         switch (setup.bRequest) {
1330                         case USB_REQ_SET_ADDRESS:
1331                                 if (setup.bRequestType != Dev_Request)
1332                                         break;
1333                                 dum->address = w_value;
1334                                 status = 0;
1335                                 dev_dbg (udc_dev(dum), "set_address = %d\n",
1336                                                 w_value);
1337                                 value = 0;
1338                                 break;
1339                         case USB_REQ_SET_FEATURE:
1340                                 if (setup.bRequestType == Dev_Request) {
1341                                         value = 0;
1342                                         switch (w_value) {
1343                                         case USB_DEVICE_REMOTE_WAKEUP:
1344                                                 break;
1345                                         case USB_DEVICE_B_HNP_ENABLE:
1346                                                 dum->gadget.b_hnp_enable = 1;
1347                                                 break;
1348                                         case USB_DEVICE_A_HNP_SUPPORT:
1349                                                 dum->gadget.a_hnp_support = 1;
1350                                                 break;
1351                                         case USB_DEVICE_A_ALT_HNP_SUPPORT:
1352                                                 dum->gadget.a_alt_hnp_support
1353                                                         = 1;
1354                                                 break;
1355                                         default:
1356                                                 value = -EOPNOTSUPP;
1357                                         }
1358                                         if (value == 0) {
1359                                                 dum->devstatus |=
1360                                                         (1 << w_value);
1361                                                 status = 0;
1362                                         }
1363
1364                                 } else if (setup.bRequestType == Ep_Request) {
1365                                         // endpoint halt
1366                                         ep2 = find_endpoint (dum, w_index);
1367                                         if (!ep2 || ep2->ep.name == ep0name) {
1368                                                 value = -EOPNOTSUPP;
1369                                                 break;
1370                                         }
1371                                         ep2->halted = 1;
1372                                         value = 0;
1373                                         status = 0;
1374                                 }
1375                                 break;
1376                         case USB_REQ_CLEAR_FEATURE:
1377                                 if (setup.bRequestType == Dev_Request) {
1378                                         switch (w_value) {
1379                                         case USB_DEVICE_REMOTE_WAKEUP:
1380                                                 dum->devstatus &= ~(1 <<
1381                                                         USB_DEVICE_REMOTE_WAKEUP);
1382                                                 value = 0;
1383                                                 status = 0;
1384                                                 break;
1385                                         default:
1386                                                 value = -EOPNOTSUPP;
1387                                                 break;
1388                                         }
1389                                 } else if (setup.bRequestType == Ep_Request) {
1390                                         // endpoint halt
1391                                         ep2 = find_endpoint (dum, w_index);
1392                                         if (!ep2) {
1393                                                 value = -EOPNOTSUPP;
1394                                                 break;
1395                                         }
1396                                         if (!ep2->wedged)
1397                                                 ep2->halted = 0;
1398                                         value = 0;
1399                                         status = 0;
1400                                 }
1401                                 break;
1402                         case USB_REQ_GET_STATUS:
1403                                 if (setup.bRequestType == Dev_InRequest
1404                                                 || setup.bRequestType
1405                                                         == Intf_InRequest
1406                                                 || setup.bRequestType
1407                                                         == Ep_InRequest
1408                                                 ) {
1409                                         char *buf;
1410
1411                                         // device: remote wakeup, selfpowered
1412                                         // interface: nothing
1413                                         // endpoint: halt
1414                                         buf = (char *)urb->transfer_buffer;
1415                                         if (urb->transfer_buffer_length > 0) {
1416                                                 if (setup.bRequestType ==
1417                                                                 Ep_InRequest) {
1418         ep2 = find_endpoint (dum, w_index);
1419         if (!ep2) {
1420                 value = -EOPNOTSUPP;
1421                 break;
1422         }
1423         buf [0] = ep2->halted;
1424                                                 } else if (setup.bRequestType ==
1425                                                                 Dev_InRequest) {
1426                                                         buf [0] = (u8)
1427                                                                 dum->devstatus;
1428                                                 } else
1429                                                         buf [0] = 0;
1430                                         }
1431                                         if (urb->transfer_buffer_length > 1)
1432                                                 buf [1] = 0;
1433                                         urb->actual_length = min_t(u32, 2,
1434                                                 urb->transfer_buffer_length);
1435                                         value = 0;
1436                                         status = 0;
1437                                 }
1438                                 break;
1439                         }
1440
1441                         /* gadget driver handles all other requests.  block
1442                          * until setup() returns; no reentrancy issues etc.
1443                          */
1444                         if (value > 0) {
1445                                 spin_unlock (&dum->lock);
1446                                 value = dum->driver->setup (&dum->gadget,
1447                                                 &setup);
1448                                 spin_lock (&dum->lock);
1449
1450                                 if (value >= 0) {
1451                                         /* no delays (max 64KB data stage) */
1452                                         limit = 64*1024;
1453                                         goto treat_control_like_bulk;
1454                                 }
1455                                 /* error, see below */
1456                         }
1457
1458                         if (value < 0) {
1459                                 if (value != -EOPNOTSUPP)
1460                                         dev_dbg (udc_dev(dum),
1461                                                 "setup --> %d\n",
1462                                                 value);
1463                                 status = -EPIPE;
1464                                 urb->actual_length = 0;
1465                         }
1466
1467                         goto return_urb;
1468                 }
1469
1470                 /* non-control requests */
1471                 limit = total;
1472                 switch (usb_pipetype (urb->pipe)) {
1473                 case PIPE_ISOCHRONOUS:
1474                         /* FIXME is it urb->interval since the last xfer?
1475                          * use urb->iso_frame_desc[i].
1476                          * complete whether or not ep has requests queued.
1477                          * report random errors, to debug drivers.
1478                          */
1479                         limit = max (limit, periodic_bytes (dum, ep));
1480                         status = -ENOSYS;
1481                         break;
1482
1483                 case PIPE_INTERRUPT:
1484                         /* FIXME is it urb->interval since the last xfer?
1485                          * this almost certainly polls too fast.
1486                          */
1487                         limit = max (limit, periodic_bytes (dum, ep));
1488                         /* FALLTHROUGH */
1489
1490                 // case PIPE_BULK:  case PIPE_CONTROL:
1491                 default:
1492                 treat_control_like_bulk:
1493                         ep->last_io = jiffies;
1494                         total = transfer(dum, urb, ep, limit, &status);
1495                         break;
1496                 }
1497
1498                 /* incomplete transfer? */
1499                 if (status == -EINPROGRESS)
1500                         continue;
1501
1502 return_urb:
1503                 list_del (&urbp->urbp_list);
1504                 kfree (urbp);
1505                 if (ep)
1506                         ep->already_seen = ep->setup_stage = 0;
1507
1508                 usb_hcd_unlink_urb_from_ep(dummy_to_hcd(dum), urb);
1509                 spin_unlock (&dum->lock);
1510                 usb_hcd_giveback_urb(dummy_to_hcd(dum), urb, status);
1511                 spin_lock (&dum->lock);
1512
1513                 goto restart;
1514         }
1515
1516         if (list_empty (&dum->urbp_list)) {
1517                 usb_put_dev (dum->udev);
1518                 dum->udev = NULL;
1519         } else if (dum->rh_state == DUMMY_RH_RUNNING) {
1520                 /* want a 1 msec delay here */
1521                 mod_timer (&dum->timer, jiffies + msecs_to_jiffies(1));
1522         }
1523
1524         spin_unlock_irqrestore (&dum->lock, flags);
1525 }
1526
1527 /*-------------------------------------------------------------------------*/
1528
1529 #define PORT_C_MASK \
1530         ((USB_PORT_STAT_C_CONNECTION \
1531         | USB_PORT_STAT_C_ENABLE \
1532         | USB_PORT_STAT_C_SUSPEND \
1533         | USB_PORT_STAT_C_OVERCURRENT \
1534         | USB_PORT_STAT_C_RESET) << 16)
1535
1536 static int dummy_hub_status (struct usb_hcd *hcd, char *buf)
1537 {
1538         struct dummy            *dum;
1539         unsigned long           flags;
1540         int                     retval = 0;
1541
1542         dum = hcd_to_dummy (hcd);
1543
1544         spin_lock_irqsave (&dum->lock, flags);
1545         if (!HCD_HW_ACCESSIBLE(hcd))
1546                 goto done;
1547
1548         if (dum->resuming && time_after_eq (jiffies, dum->re_timeout)) {
1549                 dum->port_status |= (USB_PORT_STAT_C_SUSPEND << 16);
1550                 dum->port_status &= ~USB_PORT_STAT_SUSPEND;
1551                 set_link_state (dum);
1552         }
1553
1554         if ((dum->port_status & PORT_C_MASK) != 0) {
1555                 *buf = (1 << 1);
1556                 dev_dbg (dummy_dev(dum), "port status 0x%08x has changes\n",
1557                                 dum->port_status);
1558                 retval = 1;
1559                 if (dum->rh_state == DUMMY_RH_SUSPENDED)
1560                         usb_hcd_resume_root_hub (hcd);
1561         }
1562 done:
1563         spin_unlock_irqrestore (&dum->lock, flags);
1564         return retval;
1565 }
1566
1567 static inline void
1568 hub_descriptor (struct usb_hub_descriptor *desc)
1569 {
1570         memset (desc, 0, sizeof *desc);
1571         desc->bDescriptorType = 0x29;
1572         desc->bDescLength = 9;
1573         desc->wHubCharacteristics = cpu_to_le16(0x0001);
1574         desc->bNbrPorts = 1;
1575         desc->bitmap [0] = 0xff;
1576         desc->bitmap [1] = 0xff;
1577 }
1578
1579 static int dummy_hub_control (
1580         struct usb_hcd  *hcd,
1581         u16             typeReq,
1582         u16             wValue,
1583         u16             wIndex,
1584         char            *buf,
1585         u16             wLength
1586 ) {
1587         struct dummy    *dum;
1588         int             retval = 0;
1589         unsigned long   flags;
1590
1591         if (!HCD_HW_ACCESSIBLE(hcd))
1592                 return -ETIMEDOUT;
1593
1594         dum = hcd_to_dummy (hcd);
1595         spin_lock_irqsave (&dum->lock, flags);
1596         switch (typeReq) {
1597         case ClearHubFeature:
1598                 break;
1599         case ClearPortFeature:
1600                 switch (wValue) {
1601                 case USB_PORT_FEAT_SUSPEND:
1602                         if (dum->port_status & USB_PORT_STAT_SUSPEND) {
1603                                 /* 20msec resume signaling */
1604                                 dum->resuming = 1;
1605                                 dum->re_timeout = jiffies +
1606                                                 msecs_to_jiffies(20);
1607                         }
1608                         break;
1609                 case USB_PORT_FEAT_POWER:
1610                         if (dum->port_status & USB_PORT_STAT_POWER)
1611                                 dev_dbg (dummy_dev(dum), "power-off\n");
1612                         /* FALLS THROUGH */
1613                 default:
1614                         dum->port_status &= ~(1 << wValue);
1615                         set_link_state (dum);
1616                 }
1617                 break;
1618         case GetHubDescriptor:
1619                 hub_descriptor ((struct usb_hub_descriptor *) buf);
1620                 break;
1621         case GetHubStatus:
1622                 *(__le32 *) buf = cpu_to_le32 (0);
1623                 break;
1624         case GetPortStatus:
1625                 if (wIndex != 1)
1626                         retval = -EPIPE;
1627
1628                 /* whoever resets or resumes must GetPortStatus to
1629                  * complete it!!
1630                  */
1631                 if (dum->resuming &&
1632                                 time_after_eq (jiffies, dum->re_timeout)) {
1633                         dum->port_status |= (USB_PORT_STAT_C_SUSPEND << 16);
1634                         dum->port_status &= ~USB_PORT_STAT_SUSPEND;
1635                 }
1636                 if ((dum->port_status & USB_PORT_STAT_RESET) != 0 &&
1637                                 time_after_eq (jiffies, dum->re_timeout)) {
1638                         dum->port_status |= (USB_PORT_STAT_C_RESET << 16);
1639                         dum->port_status &= ~USB_PORT_STAT_RESET;
1640                         if (dum->pullup) {
1641                                 dum->port_status |= USB_PORT_STAT_ENABLE;
1642                                 /* give it the best speed we agree on */
1643                                 dum->gadget.speed = dum->driver->speed;
1644                                 dum->gadget.ep0->maxpacket = 64;
1645                                 switch (dum->gadget.speed) {
1646                                 case USB_SPEED_HIGH:
1647                                         dum->port_status |=
1648                                                 USB_PORT_STAT_HIGH_SPEED;
1649                                         break;
1650                                 case USB_SPEED_LOW:
1651                                         dum->gadget.ep0->maxpacket = 8;
1652                                         dum->port_status |=
1653                                                 USB_PORT_STAT_LOW_SPEED;
1654                                         break;
1655                                 default:
1656                                         dum->gadget.speed = USB_SPEED_FULL;
1657                                         break;
1658                                 }
1659                         }
1660                 }
1661                 set_link_state (dum);
1662                 ((__le16 *) buf)[0] = cpu_to_le16 (dum->port_status);
1663                 ((__le16 *) buf)[1] = cpu_to_le16 (dum->port_status >> 16);
1664                 break;
1665         case SetHubFeature:
1666                 retval = -EPIPE;
1667                 break;
1668         case SetPortFeature:
1669                 switch (wValue) {
1670                 case USB_PORT_FEAT_SUSPEND:
1671                         if (dum->active) {
1672                                 dum->port_status |= USB_PORT_STAT_SUSPEND;
1673
1674                                 /* HNP would happen here; for now we
1675                                  * assume b_bus_req is always true.
1676                                  */
1677                                 set_link_state (dum);
1678                                 if (((1 << USB_DEVICE_B_HNP_ENABLE)
1679                                                 & dum->devstatus) != 0)
1680                                         dev_dbg (dummy_dev(dum),
1681                                                         "no HNP yet!\n");
1682                         }
1683                         break;
1684                 case USB_PORT_FEAT_POWER:
1685                         dum->port_status |= USB_PORT_STAT_POWER;
1686                         set_link_state (dum);
1687                         break;
1688                 case USB_PORT_FEAT_RESET:
1689                         /* if it's already enabled, disable */
1690                         dum->port_status &= ~(USB_PORT_STAT_ENABLE
1691                                         | USB_PORT_STAT_LOW_SPEED
1692                                         | USB_PORT_STAT_HIGH_SPEED);
1693                         dum->devstatus = 0;
1694                         /* 50msec reset signaling */
1695                         dum->re_timeout = jiffies + msecs_to_jiffies(50);
1696                         /* FALLS THROUGH */
1697                 default:
1698                         if ((dum->port_status & USB_PORT_STAT_POWER) != 0) {
1699                                 dum->port_status |= (1 << wValue);
1700                                 set_link_state (dum);
1701                         }
1702                 }
1703                 break;
1704
1705         default:
1706                 dev_dbg (dummy_dev(dum),
1707                         "hub control req%04x v%04x i%04x l%d\n",
1708                         typeReq, wValue, wIndex, wLength);
1709
1710                 /* "protocol stall" on error */
1711                 retval = -EPIPE;
1712         }
1713         spin_unlock_irqrestore (&dum->lock, flags);
1714
1715         if ((dum->port_status & PORT_C_MASK) != 0)
1716                 usb_hcd_poll_rh_status (hcd);
1717         return retval;
1718 }
1719
1720 static int dummy_bus_suspend (struct usb_hcd *hcd)
1721 {
1722         struct dummy *dum = hcd_to_dummy (hcd);
1723
1724         dev_dbg (&hcd->self.root_hub->dev, "%s\n", __func__);
1725
1726         spin_lock_irq (&dum->lock);
1727         dum->rh_state = DUMMY_RH_SUSPENDED;
1728         set_link_state (dum);
1729         hcd->state = HC_STATE_SUSPENDED;
1730         spin_unlock_irq (&dum->lock);
1731         return 0;
1732 }
1733
1734 static int dummy_bus_resume (struct usb_hcd *hcd)
1735 {
1736         struct dummy *dum = hcd_to_dummy (hcd);
1737         int rc = 0;
1738
1739         dev_dbg (&hcd->self.root_hub->dev, "%s\n", __func__);
1740
1741         spin_lock_irq (&dum->lock);
1742         if (!HCD_HW_ACCESSIBLE(hcd)) {
1743                 rc = -ESHUTDOWN;
1744         } else {
1745                 dum->rh_state = DUMMY_RH_RUNNING;
1746                 set_link_state (dum);
1747                 if (!list_empty(&dum->urbp_list))
1748                         mod_timer (&dum->timer, jiffies);
1749                 hcd->state = HC_STATE_RUNNING;
1750         }
1751         spin_unlock_irq (&dum->lock);
1752         return rc;
1753 }
1754
1755 /*-------------------------------------------------------------------------*/
1756
1757 static inline ssize_t
1758 show_urb (char *buf, size_t size, struct urb *urb)
1759 {
1760         int ep = usb_pipeendpoint (urb->pipe);
1761
1762         return snprintf (buf, size,
1763                 "urb/%p %s ep%d%s%s len %d/%d\n",
1764                 urb,
1765                 ({ char *s;
1766                  switch (urb->dev->speed) {
1767                  case USB_SPEED_LOW:    s = "ls"; break;
1768                  case USB_SPEED_FULL:   s = "fs"; break;
1769                  case USB_SPEED_HIGH:   s = "hs"; break;
1770                  default:               s = "?"; break;
1771                  }; s; }),
1772                 ep, ep ? (usb_pipein (urb->pipe) ? "in" : "out") : "",
1773                 ({ char *s; \
1774                  switch (usb_pipetype (urb->pipe)) { \
1775                  case PIPE_CONTROL:     s = ""; break; \
1776                  case PIPE_BULK:        s = "-bulk"; break; \
1777                  case PIPE_INTERRUPT:   s = "-int"; break; \
1778                  default:               s = "-iso"; break; \
1779                 }; s;}),
1780                 urb->actual_length, urb->transfer_buffer_length);
1781 }
1782
1783 static ssize_t
1784 show_urbs (struct device *dev, struct device_attribute *attr, char *buf)
1785 {
1786         struct usb_hcd          *hcd = dev_get_drvdata (dev);
1787         struct dummy            *dum = hcd_to_dummy (hcd);
1788         struct urbp             *urbp;
1789         size_t                  size = 0;
1790         unsigned long           flags;
1791
1792         spin_lock_irqsave (&dum->lock, flags);
1793         list_for_each_entry (urbp, &dum->urbp_list, urbp_list) {
1794                 size_t          temp;
1795
1796                 temp = show_urb (buf, PAGE_SIZE - size, urbp->urb);
1797                 buf += temp;
1798                 size += temp;
1799         }
1800         spin_unlock_irqrestore (&dum->lock, flags);
1801
1802         return size;
1803 }
1804 static DEVICE_ATTR (urbs, S_IRUGO, show_urbs, NULL);
1805
1806 static int dummy_start (struct usb_hcd *hcd)
1807 {
1808         struct dummy            *dum;
1809
1810         dum = hcd_to_dummy (hcd);
1811
1812         /*
1813          * MASTER side init ... we emulate a root hub that'll only ever
1814          * talk to one device (the slave side).  Also appears in sysfs,
1815          * just like more familiar pci-based HCDs.
1816          */
1817         spin_lock_init (&dum->lock);
1818         init_timer (&dum->timer);
1819         dum->timer.function = dummy_timer;
1820         dum->timer.data = (unsigned long) dum;
1821         dum->rh_state = DUMMY_RH_RUNNING;
1822
1823         INIT_LIST_HEAD (&dum->urbp_list);
1824
1825         hcd->power_budget = POWER_BUDGET;
1826         hcd->state = HC_STATE_RUNNING;
1827         hcd->uses_new_polling = 1;
1828
1829 #ifdef CONFIG_USB_OTG
1830         hcd->self.otg_port = 1;
1831 #endif
1832
1833         /* FIXME 'urbs' should be a per-device thing, maybe in usbcore */
1834         return device_create_file (dummy_dev(dum), &dev_attr_urbs);
1835 }
1836
1837 static void dummy_stop (struct usb_hcd *hcd)
1838 {
1839         struct dummy            *dum;
1840
1841         dum = hcd_to_dummy (hcd);
1842
1843         device_remove_file (dummy_dev(dum), &dev_attr_urbs);
1844         usb_gadget_unregister_driver (dum->driver);
1845         dev_info (dummy_dev(dum), "stopped\n");
1846 }
1847
1848 /*-------------------------------------------------------------------------*/
1849
1850 static int dummy_h_get_frame (struct usb_hcd *hcd)
1851 {
1852         return dummy_g_get_frame (NULL);
1853 }
1854
1855 static const struct hc_driver dummy_hcd = {
1856         .description =          (char *) driver_name,
1857         .product_desc =         "Dummy host controller",
1858         .hcd_priv_size =        sizeof(struct dummy),
1859
1860         .flags =                HCD_USB2,
1861
1862         .start =                dummy_start,
1863         .stop =                 dummy_stop,
1864
1865         .urb_enqueue =          dummy_urb_enqueue,
1866         .urb_dequeue =          dummy_urb_dequeue,
1867
1868         .get_frame_number =     dummy_h_get_frame,
1869
1870         .hub_status_data =      dummy_hub_status,
1871         .hub_control =          dummy_hub_control,
1872         .bus_suspend =          dummy_bus_suspend,
1873         .bus_resume =           dummy_bus_resume,
1874 };
1875
1876 static int dummy_hcd_probe(struct platform_device *pdev)
1877 {
1878         struct usb_hcd          *hcd;
1879         int                     retval;
1880
1881         dev_info(&pdev->dev, "%s, driver " DRIVER_VERSION "\n", driver_desc);
1882
1883         hcd = usb_create_hcd(&dummy_hcd, &pdev->dev, dev_name(&pdev->dev));
1884         if (!hcd)
1885                 return -ENOMEM;
1886         the_controller = hcd_to_dummy (hcd);
1887
1888         retval = usb_add_hcd(hcd, 0, 0);
1889         if (retval != 0) {
1890                 usb_put_hcd (hcd);
1891                 the_controller = NULL;
1892         }
1893         return retval;
1894 }
1895
1896 static int dummy_hcd_remove (struct platform_device *pdev)
1897 {
1898         struct usb_hcd          *hcd;
1899
1900         hcd = platform_get_drvdata (pdev);
1901         usb_remove_hcd (hcd);
1902         usb_put_hcd (hcd);
1903         the_controller = NULL;
1904         return 0;
1905 }
1906
1907 static int dummy_hcd_suspend (struct platform_device *pdev, pm_message_t state)
1908 {
1909         struct usb_hcd          *hcd;
1910         struct dummy            *dum;
1911         int                     rc = 0;
1912
1913         dev_dbg (&pdev->dev, "%s\n", __func__);
1914
1915         hcd = platform_get_drvdata (pdev);
1916         dum = hcd_to_dummy (hcd);
1917         if (dum->rh_state == DUMMY_RH_RUNNING) {
1918                 dev_warn(&pdev->dev, "Root hub isn't suspended!\n");
1919                 rc = -EBUSY;
1920         } else
1921                 clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
1922         return rc;
1923 }
1924
1925 static int dummy_hcd_resume (struct platform_device *pdev)
1926 {
1927         struct usb_hcd          *hcd;
1928
1929         dev_dbg (&pdev->dev, "%s\n", __func__);
1930
1931         hcd = platform_get_drvdata (pdev);
1932         set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
1933         usb_hcd_poll_rh_status (hcd);
1934         return 0;
1935 }
1936
1937 static struct platform_driver dummy_hcd_driver = {
1938         .probe          = dummy_hcd_probe,
1939         .remove         = dummy_hcd_remove,
1940         .suspend        = dummy_hcd_suspend,
1941         .resume         = dummy_hcd_resume,
1942         .driver         = {
1943                 .name   = (char *) driver_name,
1944                 .owner  = THIS_MODULE,
1945         },
1946 };
1947
1948 /*-------------------------------------------------------------------------*/
1949
1950 static struct platform_device *the_udc_pdev;
1951 static struct platform_device *the_hcd_pdev;
1952
1953 static int __init init (void)
1954 {
1955         int     retval = -ENOMEM;
1956
1957         if (usb_disabled ())
1958                 return -ENODEV;
1959
1960         the_hcd_pdev = platform_device_alloc(driver_name, -1);
1961         if (!the_hcd_pdev)
1962                 return retval;
1963         the_udc_pdev = platform_device_alloc(gadget_name, -1);
1964         if (!the_udc_pdev)
1965                 goto err_alloc_udc;
1966
1967         retval = platform_driver_register(&dummy_hcd_driver);
1968         if (retval < 0)
1969                 goto err_register_hcd_driver;
1970         retval = platform_driver_register(&dummy_udc_driver);
1971         if (retval < 0)
1972                 goto err_register_udc_driver;
1973
1974         retval = platform_device_add(the_hcd_pdev);
1975         if (retval < 0)
1976                 goto err_add_hcd;
1977         retval = platform_device_add(the_udc_pdev);
1978         if (retval < 0)
1979                 goto err_add_udc;
1980         return retval;
1981
1982 err_add_udc:
1983         platform_device_del(the_hcd_pdev);
1984 err_add_hcd:
1985         platform_driver_unregister(&dummy_udc_driver);
1986 err_register_udc_driver:
1987         platform_driver_unregister(&dummy_hcd_driver);
1988 err_register_hcd_driver:
1989         platform_device_put(the_udc_pdev);
1990 err_alloc_udc:
1991         platform_device_put(the_hcd_pdev);
1992         return retval;
1993 }
1994 module_init (init);
1995
1996 static void __exit cleanup (void)
1997 {
1998         platform_device_unregister(the_udc_pdev);
1999         platform_device_unregister(the_hcd_pdev);
2000         platform_driver_unregister(&dummy_udc_driver);
2001         platform_driver_unregister(&dummy_hcd_driver);
2002 }
2003 module_exit (cleanup);