drivers/usb/gadget/dummy_hcd.c

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