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