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   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                         goto done;
 369                 case USB_SPEED_FULL:
 370                         if (max == 8 || max == 16 || max == 32 || max == 64)
 371                                 /* we'll fake any legal size */
 372                                 break;
 373                         /* save a return statement */
 374                 default:
 375                         goto done;
 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                 list_add_tail(&req->queue, &ep->queue);
 546                 spin_unlock (&dum->lock);
 547                 _req->actual = _req->length;
 548                 _req->status = 0;
 549                 _req->complete (_ep, _req);
 550                 spin_lock (&dum->lock);
 551         }  else
 552                 list_add_tail(&req->queue, &ep->queue);
 553         spin_unlock_irqrestore (&dum->lock, flags);
 554
 555         /* real hardware would likely enable transfers here, in case
 556          * it'd been left NAKing.
 557          */
 558         return 0;
 559 }
 560
 561 static int dummy_dequeue (struct usb_ep *_ep, struct usb_request *_req)
 562 {
 563         struct dummy_ep         *ep;
 564         struct dummy            *dum;
 565         int                     retval = -EINVAL;
 566         unsigned long           flags;
 567         struct dummy_request    *req = NULL;
 568
 569         if (!_ep || !_req)
 570                 return retval;
 571         ep = usb_ep_to_dummy_ep (_ep);
 572         dum = ep_to_dummy (ep);
 573
 574         if (!dum->driver)
 575                 return -ESHUTDOWN;
 576
 577         local_irq_save (flags);
 578         spin_lock (&dum->lock);
 579         list_for_each_entry (req, &ep->queue, queue) {
 580                 if (&req->req == _req) {
 581                         list_del_init (&req->queue);
 582                         _req->status = -ECONNRESET;
 583                         retval = 0;
 584                         break;
 585                 }
 586         }
 587         spin_unlock (&dum->lock);
 588
 589         if (retval == 0) {
 590                 dev_dbg (udc_dev(dum),
 591                                 "dequeued req %p from %s, len %d buf %p\n",
 592                                 req, _ep->name, _req->length, _req->buf);
 593                 _req->complete (_ep, _req);
 594         }
 595         local_irq_restore (flags);
 596         return retval;
 597 }
 598
 599 static int
 600 dummy_set_halt (struct usb_ep *_ep, int value)
 601 {
 602         struct dummy_ep         *ep;
 603         struct dummy            *dum;
 604
 605         if (!_ep)
 606                 return -EINVAL;
 607         ep = usb_ep_to_dummy_ep (_ep);
 608         dum = ep_to_dummy (ep);
 609         if (!dum->driver)
 610                 return -ESHUTDOWN;
 611         if (!value)
 612                 ep->halted = 0;
 613         else if (ep->desc && (ep->desc->bEndpointAddress & USB_DIR_IN) &&
 614                         !list_empty (&ep->queue))
 615                 return -EAGAIN;
 616         else
 617                 ep->halted = 1;
 618         /* FIXME clear emulated data toggle too */
 619         return 0;
 620 }
 621
 622 static const struct usb_ep_ops dummy_ep_ops = {
 623         .enable         = dummy_enable,
 624         .disable        = dummy_disable,
 625
 626         .alloc_request  = dummy_alloc_request,
 627         .free_request   = dummy_free_request,
 628
 629         .queue          = dummy_queue,
 630         .dequeue        = dummy_dequeue,
 631
 632         .set_halt       = dummy_set_halt,
 633 };
 634
 635 /*-------------------------------------------------------------------------*/
 636
 637 /* there are both host and device side versions of this call ... */
 638 static int dummy_g_get_frame (struct usb_gadget *_gadget)
 639 {
 640         struct timeval  tv;
 641
 642         do_gettimeofday (&tv);
 643         return tv.tv_usec / 1000;
 644 }
 645
 646 static int dummy_wakeup (struct usb_gadget *_gadget)
 647 {
 648         struct dummy    *dum;
 649
 650         dum = gadget_to_dummy (_gadget);
 651         if (!(dum->devstatus &  ( (1 << USB_DEVICE_B_HNP_ENABLE)
 652                                 | (1 << USB_DEVICE_REMOTE_WAKEUP))))
 653                 return -EINVAL;
 654         if ((dum->port_status & USB_PORT_STAT_CONNECTION) == 0)
 655                 return -ENOLINK;
 656         if ((dum->port_status & USB_PORT_STAT_SUSPEND) == 0 &&
 657                          dum->rh_state != DUMMY_RH_SUSPENDED)
 658                 return -EIO;
 659
 660         /* FIXME: What if the root hub is suspended but the port isn't? */
 661
 662         /* hub notices our request, issues downstream resume, etc */
 663         dum->resuming = 1;
 664         dum->re_timeout = jiffies + msecs_to_jiffies(20);
 665         mod_timer (&dummy_to_hcd (dum)->rh_timer, dum->re_timeout);
 666         return 0;
 667 }
 668
 669 static int dummy_set_selfpowered (struct usb_gadget *_gadget, int value)
 670 {
 671         struct dummy    *dum;
 672
 673         dum = gadget_to_dummy (_gadget);
 674         if (value)
 675                 dum->devstatus |= (1 << USB_DEVICE_SELF_POWERED);
 676         else
 677                 dum->devstatus &= ~(1 << USB_DEVICE_SELF_POWERED);
 678         return 0;
 679 }
 680
 681 static int dummy_pullup (struct usb_gadget *_gadget, int value)
 682 {
 683         struct dummy    *dum;
 684         unsigned long   flags;
 685
 686         dum = gadget_to_dummy (_gadget);
 687         spin_lock_irqsave (&dum->lock, flags);
 688         dum->pullup = (value != 0);
 689         set_link_state (dum);
 690         spin_unlock_irqrestore (&dum->lock, flags);
 691
 692         usb_hcd_poll_rh_status (dummy_to_hcd (dum));
 693         return 0;
 694 }
 695
 696 static const struct usb_gadget_ops dummy_ops = {
 697         .get_frame      = dummy_g_get_frame,
 698         .wakeup         = dummy_wakeup,
 699         .set_selfpowered = dummy_set_selfpowered,
 700         .pullup         = dummy_pullup,
 701 };
 702
 703 /*-------------------------------------------------------------------------*/
 704
 705 /* "function" sysfs attribute */
 706 static ssize_t
 707 show_function (struct device *dev, struct device_attribute *attr, char *buf)
 708 {
 709         struct dummy    *dum = gadget_dev_to_dummy (dev);
 710
 711         if (!dum->driver || !dum->driver->function)
 712                 return 0;
 713         return scnprintf (buf, PAGE_SIZE, "%s\n", dum->driver->function);
 714 }
 715 static DEVICE_ATTR (function, S_IRUGO, show_function, NULL);
 716
 717 /*-------------------------------------------------------------------------*/
 718
 719 /*
 720  * Driver registration/unregistration.
 721  *
 722  * This is basically hardware-specific; there's usually only one real USB
 723  * device (not host) controller since that's how USB devices are intended
 724  * to work.  So most implementations of these api calls will rely on the
 725  * fact that only one driver will ever bind to the hardware.  But curious
 726  * hardware can be built with discrete components, so the gadget API doesn't
 727  * require that assumption.
 728  *
 729  * For this emulator, it might be convenient to create a usb slave device
 730  * for each driver that registers:  just add to a big root hub.
 731  */
 732
 733 int
 734 usb_gadget_register_driver (struct usb_gadget_driver *driver)
 735 {
 736         struct dummy    *dum = the_controller;
 737         int             retval, i;
 738
 739         if (!dum)
 740                 return -EINVAL;
 741         if (dum->driver)
 742                 return -EBUSY;
 743         if (!driver->bind || !driver->setup
 744                         || driver->speed == USB_SPEED_UNKNOWN)
 745                 return -EINVAL;
 746
 747         /*
 748          * SLAVE side init ... the layer above hardware, which
 749          * can't enumerate without help from the driver we're binding.
 750          */
 751
 752         dum->devstatus = 0;
 753
 754         INIT_LIST_HEAD (&dum->gadget.ep_list);
 755         for (i = 0; i < DUMMY_ENDPOINTS; i++) {
 756                 struct dummy_ep *ep = &dum->ep [i];
 757
 758                 if (!ep_name [i])
 759                         break;
 760                 ep->ep.name = ep_name [i];
 761                 ep->ep.ops = &dummy_ep_ops;
 762                 list_add_tail (&ep->ep.ep_list, &dum->gadget.ep_list);
 763                 ep->halted = ep->already_seen = ep->setup_stage = 0;
 764                 ep->ep.maxpacket = ~0;
 765                 ep->last_io = jiffies;
 766                 ep->gadget = &dum->gadget;
 767                 ep->desc = NULL;
 768                 INIT_LIST_HEAD (&ep->queue);
 769         }
 770
 771         dum->gadget.ep0 = &dum->ep [0].ep;
 772         dum->ep [0].ep.maxpacket = 64;
 773         list_del_init (&dum->ep [0].ep.ep_list);
 774         INIT_LIST_HEAD(&dum->fifo_req.queue);
 775
 776         driver->driver.bus = NULL;
 777         dum->driver = driver;
 778         dum->gadget.dev.driver = &driver->driver;
 779         dev_dbg (udc_dev(dum), "binding gadget driver '%s'\n",
 780                         driver->driver.name);
 781         retval = driver->bind(&dum->gadget);
 782         if (retval) {
 783                 dum->driver = NULL;
 784                 dum->gadget.dev.driver = NULL;
 785                 return retval;
 786         }
 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 EXPORT_SYMBOL (usb_gadget_register_driver);
 798
 799 int
 800 usb_gadget_unregister_driver (struct usb_gadget_driver *driver)
 801 {
 802         struct dummy    *dum = the_controller;
 803         unsigned long   flags;
 804
 805         if (!dum)
 806                 return -ENODEV;
 807         if (!driver || driver != dum->driver || !driver->unbind)
 808                 return -EINVAL;
 809
 810         dev_dbg (udc_dev(dum), "unregister gadget driver '%s'\n",
 811                         driver->driver.name);
 812
 813         spin_lock_irqsave (&dum->lock, flags);
 814         dum->pullup = 0;
 815         set_link_state (dum);
 816         spin_unlock_irqrestore (&dum->lock, flags);
 817
 818         driver->unbind (&dum->gadget);
 819         dum->gadget.dev.driver = NULL;
 820         dum->driver = NULL;
 821
 822         spin_lock_irqsave (&dum->lock, flags);
 823         dum->pullup = 0;
 824         set_link_state (dum);
 825         spin_unlock_irqrestore (&dum->lock, flags);
 826
 827         usb_hcd_poll_rh_status (dummy_to_hcd (dum));
 828         return 0;
 829 }
 830 EXPORT_SYMBOL (usb_gadget_unregister_driver);
 831
 832 #undef is_enabled
 833
 834 /* just declare this in any driver that really need it */
 835 extern int net2280_set_fifo_mode (struct usb_gadget *gadget, int mode);
 836
 837 int net2280_set_fifo_mode (struct usb_gadget *gadget, int mode)
 838 {
 839         return -ENOSYS;
 840 }
 841 EXPORT_SYMBOL (net2280_set_fifo_mode);
 842
 843
 844 /* The gadget structure is stored inside the hcd structure and will be
 845  * released along with it. */
 846 static void
 847 dummy_gadget_release (struct device *dev)
 848 {
 849         struct dummy    *dum = gadget_dev_to_dummy (dev);
 850
 851         usb_put_hcd (dummy_to_hcd (dum));
 852 }
 853
 854 static int dummy_udc_probe (struct platform_device *pdev)
 855 {
 856         struct dummy    *dum = the_controller;
 857         int             rc;
 858
 859         dum->gadget.name = gadget_name;
 860         dum->gadget.ops = &dummy_ops;
 861         dum->gadget.is_dualspeed = 1;
 862
 863         /* maybe claim OTG support, though we won't complete HNP */
 864         dum->gadget.is_otg = (dummy_to_hcd(dum)->self.otg_port != 0);
 865
 866         dev_set_name(&dum->gadget.dev, "gadget");
 867         dum->gadget.dev.parent = &pdev->dev;
 868         dum->gadget.dev.release = dummy_gadget_release;
 869         rc = device_register (&dum->gadget.dev);
 870         if (rc < 0)
 871                 return rc;
 872
 873         usb_get_hcd (dummy_to_hcd (dum));
 874
 875         platform_set_drvdata (pdev, dum);
 876         rc = device_create_file (&dum->gadget.dev, &dev_attr_function);
 877         if (rc < 0)
 878                 device_unregister (&dum->gadget.dev);
 879         return rc;
 880 }
 881
 882 static int dummy_udc_remove (struct platform_device *pdev)
 883 {
 884         struct dummy    *dum = platform_get_drvdata (pdev);
 885
 886         platform_set_drvdata (pdev, NULL);
 887         device_remove_file (&dum->gadget.dev, &dev_attr_function);
 888         device_unregister (&dum->gadget.dev);
 889         return 0;
 890 }
 891
 892 static int dummy_udc_suspend (struct platform_device *pdev, pm_message_t state)
 893 {
 894         struct dummy    *dum = platform_get_drvdata(pdev);
 895
 896         dev_dbg (&pdev->dev, "%s\n", __func__);
 897         spin_lock_irq (&dum->lock);
 898         dum->udc_suspended = 1;
 899         set_link_state (dum);
 900         spin_unlock_irq (&dum->lock);
 901
 902         usb_hcd_poll_rh_status (dummy_to_hcd (dum));
 903         return 0;
 904 }
 905
 906 static int dummy_udc_resume (struct platform_device *pdev)
 907 {
 908         struct dummy    *dum = platform_get_drvdata(pdev);
 909
 910         dev_dbg (&pdev->dev, "%s\n", __func__);
 911         spin_lock_irq (&dum->lock);
 912         dum->udc_suspended = 0;
 913         set_link_state (dum);
 914         spin_unlock_irq (&dum->lock);
 915
 916         usb_hcd_poll_rh_status (dummy_to_hcd (dum));
 917         return 0;
 918 }
 919
 920 static struct platform_driver dummy_udc_driver = {
 921         .probe          = dummy_udc_probe,
 922         .remove         = dummy_udc_remove,
 923         .suspend        = dummy_udc_suspend,
 924         .resume         = dummy_udc_resume,
 925         .driver         = {
 926                 .name   = (char *) gadget_name,
 927                 .owner  = THIS_MODULE,
 928         },
 929 };
 930
 931 /*-------------------------------------------------------------------------*/
 932
 933 /* MASTER/HOST SIDE DRIVER
 934  *
 935  * this uses the hcd framework to hook up to host side drivers.
 936  * its root hub will only have one device, otherwise it acts like
 937  * a normal host controller.
 938  *
 939  * when urbs are queued, they're just stuck on a list that we
 940  * scan in a timer callback.  that callback connects writes from
 941  * the host with reads from the device, and so on, based on the
 942  * usb 2.0 rules.
 943  */
 944
 945 static int dummy_urb_enqueue (
 946         struct usb_hcd                  *hcd,
 947         struct urb                      *urb,
 948         gfp_t                           mem_flags
 949 ) {
 950         struct dummy    *dum;
 951         struct urbp     *urbp;
 952         unsigned long   flags;
 953         int             rc;
 954
 955         if (!urb->transfer_buffer && urb->transfer_buffer_length)
 956                 return -EINVAL;
 957
 958         urbp = kmalloc (sizeof *urbp, mem_flags);
 959         if (!urbp)
 960                 return -ENOMEM;
 961         urbp->urb = urb;
 962
 963         dum = hcd_to_dummy (hcd);
 964         spin_lock_irqsave (&dum->lock, flags);
 965         rc = usb_hcd_link_urb_to_ep(hcd, urb);
 966         if (rc) {
 967                 kfree(urbp);
 968                 goto done;
 969         }
 970
 971         if (!dum->udev) {
 972                 dum->udev = urb->dev;
 973                 usb_get_dev (dum->udev);
 974         } else if (unlikely (dum->udev != urb->dev))
 975                 dev_err (dummy_dev(dum), "usb_device address has changed!\n");
 976
 977         list_add_tail (&urbp->urbp_list, &dum->urbp_list);
 978         urb->hcpriv = urbp;
 979         if (usb_pipetype (urb->pipe) == PIPE_CONTROL)
 980                 urb->error_count = 1;           /* mark as a new urb */
 981
 982         /* kick the scheduler, it'll do the rest */
 983         if (!timer_pending (&dum->timer))
 984                 mod_timer (&dum->timer, jiffies + 1);
 985
 986  done:
 987         spin_unlock_irqrestore(&dum->lock, flags);
 988         return rc;
 989 }
 990
 991 static int dummy_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
 992 {
 993         struct dummy    *dum;
 994         unsigned long   flags;
 995         int             rc;
 996
 997         /* giveback happens automatically in timer callback,
 998          * so make sure the callback happens */
 999         dum = hcd_to_dummy (hcd);
1000         spin_lock_irqsave (&dum->lock, flags);
1001
1002         rc = usb_hcd_check_unlink_urb(hcd, urb, status);
1003         if (!rc && dum->rh_state != DUMMY_RH_RUNNING &&
1004                         !list_empty(&dum->urbp_list))
1005                 mod_timer (&dum->timer, jiffies);
1006
1007         spin_unlock_irqrestore (&dum->lock, flags);
1008         return rc;
1009 }
1010
1011 /* transfer up to a frame's worth; caller must own lock */
1012 static int
1013 transfer(struct dummy *dum, struct urb *urb, struct dummy_ep *ep, int limit,
1014                 int *status)
1015 {
1016         struct dummy_request    *req;
1017
1018 top:
1019         /* if there's no request queued, the device is NAKing; return */
1020         list_for_each_entry (req, &ep->queue, queue) {
1021                 unsigned        host_len, dev_len, len;
1022                 int             is_short, to_host;
1023                 int             rescan = 0;
1024
1025                 /* 1..N packets of ep->ep.maxpacket each ... the last one
1026                  * may be short (including zero length).
1027                  *
1028                  * writer can send a zlp explicitly (length 0) or implicitly
1029                  * (length mod maxpacket zero, and 'zero' flag); they always
1030                  * terminate reads.
1031                  */
1032                 host_len = urb->transfer_buffer_length - urb->actual_length;
1033                 dev_len = req->req.length - req->req.actual;
1034                 len = min (host_len, dev_len);
1035
1036                 /* FIXME update emulated data toggle too */
1037
1038                 to_host = usb_pipein (urb->pipe);
1039                 if (unlikely (len == 0))
1040                         is_short = 1;
1041                 else {
1042                         char            *ubuf, *rbuf;
1043
1044                         /* not enough bandwidth left? */
1045                         if (limit < ep->ep.maxpacket && limit < len)
1046                                 break;
1047                         len = min (len, (unsigned) limit);
1048                         if (len == 0)
1049                                 break;
1050
1051                         /* use an extra pass for the final short packet */
1052                         if (len > ep->ep.maxpacket) {
1053                                 rescan = 1;
1054                                 len -= (len % ep->ep.maxpacket);
1055                         }
1056                         is_short = (len % ep->ep.maxpacket) != 0;
1057
1058                         /* else transfer packet(s) */
1059                         ubuf = urb->transfer_buffer + urb->actual_length;
1060                         rbuf = req->req.buf + req->req.actual;
1061                         if (to_host)
1062                                 memcpy (ubuf, rbuf, len);
1063                         else
1064                                 memcpy (rbuf, ubuf, len);
1065                         ep->last_io = jiffies;
1066
1067                         limit -= len;
1068                         urb->actual_length += len;
1069                         req->req.actual += len;
1070                 }
1071
1072                 /* short packets terminate, maybe with overflow/underflow.
1073                  * it's only really an error to write too much.
1074                  *
1075                  * partially filling a buffer optionally blocks queue advances
1076                  * (so completion handlers can clean up the queue) but we don't
1077                  * need to emulate such data-in-flight.
1078                  */
1079                 if (is_short) {
1080                         if (host_len == dev_len) {
1081                                 req->req.status = 0;
1082                                 *status = 0;
1083                         } else if (to_host) {
1084                                 req->req.status = 0;
1085                                 if (dev_len > host_len)
1086                                         *status = -EOVERFLOW;
1087                                 else
1088                                         *status = 0;
1089                         } else if (!to_host) {
1090                                 *status = 0;
1091                                 if (host_len > dev_len)
1092                                         req->req.status = -EOVERFLOW;
1093                                 else
1094                                         req->req.status = 0;
1095                         }
1096
1097                 /* many requests terminate without a short packet */
1098                 } else {
1099                         if (req->req.length == req->req.actual
1100                                         && !req->req.zero)
1101                                 req->req.status = 0;
1102                         if (urb->transfer_buffer_length == urb->actual_length
1103                                         && !(urb->transfer_flags
1104                                                 & URB_ZERO_PACKET))
1105                                 *status = 0;
1106                 }
1107
1108                 /* device side completion --> continuable */
1109                 if (req->req.status != -EINPROGRESS) {
1110                         list_del_init (&req->queue);
1111
1112                         spin_unlock (&dum->lock);
1113                         req->req.complete (&ep->ep, &req->req);
1114                         spin_lock (&dum->lock);
1115
1116                         /* requests might have been unlinked... */
1117                         rescan = 1;
1118                 }
1119
1120                 /* host side completion --> terminate */
1121                 if (*status != -EINPROGRESS)
1122                         break;
1123
1124                 /* rescan to continue with any other queued i/o */
1125                 if (rescan)
1126                         goto top;
1127         }
1128         return limit;
1129 }
1130
1131 static int periodic_bytes (struct dummy *dum, struct dummy_ep *ep)
1132 {
1133         int     limit = ep->ep.maxpacket;
1134
1135         if (dum->gadget.speed == USB_SPEED_HIGH) {
1136                 int     tmp;
1137
1138                 /* high bandwidth mode */
1139                 tmp = le16_to_cpu(ep->desc->wMaxPacketSize);
1140                 tmp = (tmp >> 11) & 0x03;
1141                 tmp *= 8 /* applies to entire frame */;
1142                 limit += limit * tmp;
1143         }
1144         return limit;
1145 }
1146
1147 #define is_active(dum)  ((dum->port_status & \
1148                 (USB_PORT_STAT_CONNECTION | USB_PORT_STAT_ENABLE | \
1149                         USB_PORT_STAT_SUSPEND)) \
1150                 == (USB_PORT_STAT_CONNECTION | USB_PORT_STAT_ENABLE))
1151
1152 static struct dummy_ep *find_endpoint (struct dummy *dum, u8 address)
1153 {
1154         int             i;
1155
1156         if (!is_active (dum))
1157                 return NULL;
1158         if ((address & ~USB_DIR_IN) == 0)
1159                 return &dum->ep [0];
1160         for (i = 1; i < DUMMY_ENDPOINTS; i++) {
1161                 struct dummy_ep *ep = &dum->ep [i];
1162
1163                 if (!ep->desc)
1164                         continue;
1165                 if (ep->desc->bEndpointAddress == address)
1166                         return ep;
1167         }
1168         return NULL;
1169 }
1170
1171 #undef is_active
1172
1173 #define Dev_Request     (USB_TYPE_STANDARD | USB_RECIP_DEVICE)
1174 #define Dev_InRequest   (Dev_Request | USB_DIR_IN)
1175 #define Intf_Request    (USB_TYPE_STANDARD | USB_RECIP_INTERFACE)
1176 #define Intf_InRequest  (Intf_Request | USB_DIR_IN)
1177 #define Ep_Request      (USB_TYPE_STANDARD | USB_RECIP_ENDPOINT)
1178 #define Ep_InRequest    (Ep_Request | USB_DIR_IN)
1179
1180 /* drive both sides of the transfers; looks like irq handlers to
1181  * both drivers except the callbacks aren't in_irq().
1182  */
1183 static void dummy_timer (unsigned long _dum)
1184 {
1185         struct dummy            *dum = (struct dummy *) _dum;
1186         struct urbp             *urbp, *tmp;
1187         unsigned long           flags;
1188         int                     limit, total;
1189         int                     i;
1190
1191         /* simplistic model for one frame's bandwidth */
1192         switch (dum->gadget.speed) {
1193         case USB_SPEED_LOW:
1194                 total = 8/*bytes*/ * 12/*packets*/;
1195                 break;
1196         case USB_SPEED_FULL:
1197                 total = 64/*bytes*/ * 19/*packets*/;
1198                 break;
1199         case USB_SPEED_HIGH:
1200                 total = 512/*bytes*/ * 13/*packets*/ * 8/*uframes*/;
1201                 break;
1202         default:
1203                 dev_err (dummy_dev(dum), "bogus device speed\n");
1204                 return;
1205         }
1206
1207         /* FIXME if HZ != 1000 this will probably misbehave ... */
1208
1209         /* look at each urb queued by the host side driver */
1210         spin_lock_irqsave (&dum->lock, flags);
1211
1212         if (!dum->udev) {
1213                 dev_err (dummy_dev(dum),
1214                                 "timer fired with no URBs pending?\n");
1215                 spin_unlock_irqrestore (&dum->lock, flags);
1216                 return;
1217         }
1218
1219         for (i = 0; i < DUMMY_ENDPOINTS; i++) {
1220                 if (!ep_name [i])
1221                         break;
1222                 dum->ep [i].already_seen = 0;
1223         }
1224
1225 restart:
1226         list_for_each_entry_safe (urbp, tmp, &dum->urbp_list, urbp_list) {
1227                 struct urb              *urb;
1228                 struct dummy_request    *req;
1229                 u8                      address;
1230                 struct dummy_ep         *ep = NULL;
1231                 int                     type;
1232                 int                     status = -EINPROGRESS;
1233
1234                 urb = urbp->urb;
1235                 if (urb->unlinked)
1236                         goto return_urb;
1237                 else if (dum->rh_state != DUMMY_RH_RUNNING)
1238                         continue;
1239                 type = usb_pipetype (urb->pipe);
1240
1241                 /* used up this frame's non-periodic bandwidth?
1242                  * FIXME there's infinite bandwidth for control and
1243                  * periodic transfers ... unrealistic.
1244                  */
1245                 if (total <= 0 && type == PIPE_BULK)
1246                         continue;
1247
1248                 /* find the gadget's ep for this request (if configured) */
1249                 address = usb_pipeendpoint (urb->pipe);
1250                 if (usb_pipein (urb->pipe))
1251                         address |= USB_DIR_IN;
1252                 ep = find_endpoint(dum, address);
1253                 if (!ep) {
1254                         /* set_configuration() disagreement */
1255                         dev_dbg (dummy_dev(dum),
1256                                 "no ep configured for urb %p\n",
1257                                 urb);
1258                         status = -EPROTO;
1259                         goto return_urb;
1260                 }
1261
1262                 if (ep->already_seen)
1263                         continue;
1264                 ep->already_seen = 1;
1265                 if (ep == &dum->ep [0] && urb->error_count) {
1266                         ep->setup_stage = 1;    /* a new urb */
1267                         urb->error_count = 0;
1268                 }
1269                 if (ep->halted && !ep->setup_stage) {
1270                         /* NOTE: must not be iso! */
1271                         dev_dbg (dummy_dev(dum), "ep %s halted, urb %p\n",
1272                                         ep->ep.name, urb);
1273                         status = -EPIPE;
1274                         goto return_urb;
1275                 }
1276                 /* FIXME make sure both ends agree on maxpacket */
1277
1278                 /* handle control requests */
1279                 if (ep == &dum->ep [0] && ep->setup_stage) {
1280                         struct usb_ctrlrequest          setup;
1281                         int                             value = 1;
1282                         struct dummy_ep                 *ep2;
1283                         unsigned                        w_index;
1284                         unsigned                        w_value;
1285
1286                         setup = *(struct usb_ctrlrequest*) urb->setup_packet;
1287                         w_index = le16_to_cpu(setup.wIndex);
1288                         w_value = le16_to_cpu(setup.wValue);
1289                         if (le16_to_cpu(setup.wLength) !=
1290                                         urb->transfer_buffer_length) {
1291                                 status = -EOVERFLOW;
1292                                 goto return_urb;
1293                         }
1294
1295                         /* paranoia, in case of stale queued data */
1296                         list_for_each_entry (req, &ep->queue, queue) {
1297                                 list_del_init (&req->queue);
1298                                 req->req.status = -EOVERFLOW;
1299                                 dev_dbg (udc_dev(dum), "stale req = %p\n",
1300                                                 req);
1301
1302                                 spin_unlock (&dum->lock);
1303                                 req->req.complete (&ep->ep, &req->req);
1304                                 spin_lock (&dum->lock);
1305                                 ep->already_seen = 0;
1306                                 goto restart;
1307                         }
1308
1309                         /* gadget driver never sees set_address or operations
1310                          * on standard feature flags.  some hardware doesn't
1311                          * even expose them.
1312                          */
1313                         ep->last_io = jiffies;
1314                         ep->setup_stage = 0;
1315                         ep->halted = 0;
1316                         switch (setup.bRequest) {
1317                         case USB_REQ_SET_ADDRESS:
1318                                 if (setup.bRequestType != Dev_Request)
1319                                         break;
1320                                 dum->address = w_value;
1321                                 status = 0;
1322                                 dev_dbg (udc_dev(dum), "set_address = %d\n",
1323                                                 w_value);
1324                                 value = 0;
1325                                 break;
1326                         case USB_REQ_SET_FEATURE:
1327                                 if (setup.bRequestType == Dev_Request) {
1328                                         value = 0;
1329                                         switch (w_value) {
1330                                         case USB_DEVICE_REMOTE_WAKEUP:
1331                                                 break;
1332                                         case USB_DEVICE_B_HNP_ENABLE:
1333                                                 dum->gadget.b_hnp_enable = 1;
1334                                                 break;
1335                                         case USB_DEVICE_A_HNP_SUPPORT:
1336                                                 dum->gadget.a_hnp_support = 1;
1337                                                 break;
1338                                         case USB_DEVICE_A_ALT_HNP_SUPPORT:
1339                                                 dum->gadget.a_alt_hnp_support
1340                                                         = 1;
1341                                                 break;
1342                                         default:
1343                                                 value = -EOPNOTSUPP;
1344                                         }
1345                                         if (value == 0) {
1346                                                 dum->devstatus |=
1347                                                         (1 << w_value);
1348                                                 status = 0;
1349                                         }
1350
1351                                 } else if (setup.bRequestType == Ep_Request) {
1352                                         // endpoint halt
1353                                         ep2 = find_endpoint (dum, w_index);
1354                                         if (!ep2) {
1355                                                 value = -EOPNOTSUPP;
1356                                                 break;
1357                                         }
1358                                         ep2->halted = 1;
1359                                         value = 0;
1360                                         status = 0;
1361                                 }
1362                                 break;
1363                         case USB_REQ_CLEAR_FEATURE:
1364                                 if (setup.bRequestType == Dev_Request) {
1365                                         switch (w_value) {
1366                                         case USB_DEVICE_REMOTE_WAKEUP:
1367                                                 dum->devstatus &= ~(1 <<
1368                                                         USB_DEVICE_REMOTE_WAKEUP);
1369                                                 value = 0;
1370                                                 status = 0;
1371                                                 break;
1372                                         default:
1373                                                 value = -EOPNOTSUPP;
1374                                                 break;
1375                                         }
1376                                 } else if (setup.bRequestType == Ep_Request) {
1377                                         // endpoint halt
1378                                         ep2 = find_endpoint (dum, w_index);
1379                                         if (!ep2) {
1380                                                 value = -EOPNOTSUPP;
1381                                                 break;
1382                                         }
1383                                         ep2->halted = 0;
1384                                         value = 0;
1385                                         status = 0;
1386                                 }
1387                                 break;
1388                         case USB_REQ_GET_STATUS:
1389                                 if (setup.bRequestType == Dev_InRequest
1390                                                 || setup.bRequestType
1391                                                         == Intf_InRequest
1392                                                 || setup.bRequestType
1393                                                         == Ep_InRequest
1394                                                 ) {
1395                                         char *buf;
1396
1397                                         // device: remote wakeup, selfpowered
1398                                         // interface: nothing
1399                                         // endpoint: halt
1400                                         buf = (char *)urb->transfer_buffer;
1401                                         if (urb->transfer_buffer_length > 0) {
1402                                                 if (setup.bRequestType ==
1403                                                                 Ep_InRequest) {
1404         ep2 = find_endpoint (dum, w_index);
1405         if (!ep2) {
1406                 value = -EOPNOTSUPP;
1407                 break;
1408         }
1409         buf [0] = ep2->halted;
1410                                                 } else if (setup.bRequestType ==
1411                                                                 Dev_InRequest) {
1412                                                         buf [0] = (u8)
1413                                                                 dum->devstatus;
1414                                                 } else
1415                                                         buf [0] = 0;
1416                                         }
1417                                         if (urb->transfer_buffer_length > 1)
1418                                                 buf [1] = 0;
1419                                         urb->actual_length = min (2,
1420                                                 urb->transfer_buffer_length);
1421                                         value = 0;
1422                                         status = 0;
1423                                 }
1424                                 break;
1425                         }
1426
1427                         /* gadget driver handles all other requests.  block
1428                          * until setup() returns; no reentrancy issues etc.
1429                          */
1430                         if (value > 0) {
1431                                 spin_unlock (&dum->lock);
1432                                 value = dum->driver->setup (&dum->gadget,
1433                                                 &setup);
1434                                 spin_lock (&dum->lock);
1435
1436                                 if (value >= 0) {
1437                                         /* no delays (max 64KB data stage) */
1438                                         limit = 64*1024;
1439                                         goto treat_control_like_bulk;
1440                                 }
1441                                 /* error, see below */
1442                         }
1443
1444                         if (value < 0) {
1445                                 if (value != -EOPNOTSUPP)
1446                                         dev_dbg (udc_dev(dum),
1447                                                 "setup --> %d\n",
1448                                                 value);
1449                                 status = -EPIPE;
1450                                 urb->actual_length = 0;
1451                         }
1452
1453                         goto return_urb;
1454                 }
1455
1456                 /* non-control requests */
1457                 limit = total;
1458                 switch (usb_pipetype (urb->pipe)) {
1459                 case PIPE_ISOCHRONOUS:
1460                         /* FIXME is it urb->interval since the last xfer?
1461                          * use urb->iso_frame_desc[i].
1462                          * complete whether or not ep has requests queued.
1463                          * report random errors, to debug drivers.
1464                          */
1465                         limit = max (limit, periodic_bytes (dum, ep));
1466                         status = -ENOSYS;
1467                         break;
1468
1469                 case PIPE_INTERRUPT:
1470                         /* FIXME is it urb->interval since the last xfer?
1471                          * this almost certainly polls too fast.
1472                          */
1473                         limit = max (limit, periodic_bytes (dum, ep));
1474                         /* FALLTHROUGH */
1475
1476                 // case PIPE_BULK:  case PIPE_CONTROL:
1477                 default:
1478                 treat_control_like_bulk:
1479                         ep->last_io = jiffies;
1480                         total = transfer(dum, urb, ep, limit, &status);
1481                         break;
1482                 }
1483
1484                 /* incomplete transfer? */
1485                 if (status == -EINPROGRESS)
1486                         continue;
1487
1488 return_urb:
1489                 list_del (&urbp->urbp_list);
1490                 kfree (urbp);
1491                 if (ep)
1492                         ep->already_seen = ep->setup_stage = 0;
1493
1494                 usb_hcd_unlink_urb_from_ep(dummy_to_hcd(dum), urb);
1495                 spin_unlock (&dum->lock);
1496                 usb_hcd_giveback_urb(dummy_to_hcd(dum), urb, status);
1497                 spin_lock (&dum->lock);
1498
1499                 goto restart;
1500         }
1501
1502         if (list_empty (&dum->urbp_list)) {
1503                 usb_put_dev (dum->udev);
1504                 dum->udev = NULL;
1505         } else if (dum->rh_state == DUMMY_RH_RUNNING) {
1506                 /* want a 1 msec delay here */
1507                 mod_timer (&dum->timer, jiffies + msecs_to_jiffies(1));
1508         }
1509
1510         spin_unlock_irqrestore (&dum->lock, flags);
1511 }
1512
1513 /*-------------------------------------------------------------------------*/
1514
1515 #define PORT_C_MASK \
1516         ((USB_PORT_STAT_C_CONNECTION \
1517         | USB_PORT_STAT_C_ENABLE \
1518         | USB_PORT_STAT_C_SUSPEND \
1519         | USB_PORT_STAT_C_OVERCURRENT \
1520         | USB_PORT_STAT_C_RESET) << 16)
1521
1522 static int dummy_hub_status (struct usb_hcd *hcd, char *buf)
1523 {
1524         struct dummy            *dum;
1525         unsigned long           flags;
1526         int                     retval = 0;
1527
1528         dum = hcd_to_dummy (hcd);
1529
1530         spin_lock_irqsave (&dum->lock, flags);
1531         if (!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags))
1532                 goto done;
1533
1534         if (dum->resuming && time_after_eq (jiffies, dum->re_timeout)) {
1535                 dum->port_status |= (USB_PORT_STAT_C_SUSPEND << 16);
1536                 dum->port_status &= ~USB_PORT_STAT_SUSPEND;
1537                 set_link_state (dum);
1538         }
1539
1540         if ((dum->port_status & PORT_C_MASK) != 0) {
1541                 *buf = (1 << 1);
1542                 dev_dbg (dummy_dev(dum), "port status 0x%08x has changes\n",
1543                                 dum->port_status);
1544                 retval = 1;
1545                 if (dum->rh_state == DUMMY_RH_SUSPENDED)
1546                         usb_hcd_resume_root_hub (hcd);
1547         }
1548 done:
1549         spin_unlock_irqrestore (&dum->lock, flags);
1550         return retval;
1551 }
1552
1553 static inline void
1554 hub_descriptor (struct usb_hub_descriptor *desc)
1555 {
1556         memset (desc, 0, sizeof *desc);
1557         desc->bDescriptorType = 0x29;
1558         desc->bDescLength = 9;
1559         desc->wHubCharacteristics = cpu_to_le16(0x0001);
1560         desc->bNbrPorts = 1;
1561         desc->bitmap [0] = 0xff;
1562         desc->bitmap [1] = 0xff;
1563 }
1564
1565 static int dummy_hub_control (
1566         struct usb_hcd  *hcd,
1567         u16             typeReq,
1568         u16             wValue,
1569         u16             wIndex,
1570         char            *buf,
1571         u16             wLength
1572 ) {
1573         struct dummy    *dum;
1574         int             retval = 0;
1575         unsigned long   flags;
1576
1577         if (!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags))
1578                 return -ETIMEDOUT;
1579
1580         dum = hcd_to_dummy (hcd);
1581         spin_lock_irqsave (&dum->lock, flags);
1582         switch (typeReq) {
1583         case ClearHubFeature:
1584                 break;
1585         case ClearPortFeature:
1586                 switch (wValue) {
1587                 case USB_PORT_FEAT_SUSPEND:
1588                         if (dum->port_status & USB_PORT_STAT_SUSPEND) {
1589                                 /* 20msec resume signaling */
1590                                 dum->resuming = 1;
1591                                 dum->re_timeout = jiffies +
1592                                                 msecs_to_jiffies(20);
1593                         }
1594                         break;
1595                 case USB_PORT_FEAT_POWER:
1596                         if (dum->port_status & USB_PORT_STAT_POWER)
1597                                 dev_dbg (dummy_dev(dum), "power-off\n");
1598                         /* FALLS THROUGH */
1599                 default:
1600                         dum->port_status &= ~(1 << wValue);
1601                         set_link_state (dum);
1602                 }
1603                 break;
1604         case GetHubDescriptor:
1605                 hub_descriptor ((struct usb_hub_descriptor *) buf);
1606                 break;
1607         case GetHubStatus:
1608                 *(__le32 *) buf = __constant_cpu_to_le32 (0);
1609                 break;
1610         case GetPortStatus:
1611                 if (wIndex != 1)
1612                         retval = -EPIPE;
1613
1614                 /* whoever resets or resumes must GetPortStatus to
1615                  * complete it!!
1616                  */
1617                 if (dum->resuming &&
1618                                 time_after_eq (jiffies, dum->re_timeout)) {
1619                         dum->port_status |= (USB_PORT_STAT_C_SUSPEND << 16);
1620                         dum->port_status &= ~USB_PORT_STAT_SUSPEND;
1621                 }
1622                 if ((dum->port_status & USB_PORT_STAT_RESET) != 0 &&
1623                                 time_after_eq (jiffies, dum->re_timeout)) {
1624                         dum->port_status |= (USB_PORT_STAT_C_RESET << 16);
1625                         dum->port_status &= ~USB_PORT_STAT_RESET;
1626                         if (dum->pullup) {
1627                                 dum->port_status |= USB_PORT_STAT_ENABLE;
1628                                 /* give it the best speed we agree on */
1629                                 dum->gadget.speed = dum->driver->speed;
1630                                 dum->gadget.ep0->maxpacket = 64;
1631                                 switch (dum->gadget.speed) {
1632                                 case USB_SPEED_HIGH:
1633                                         dum->port_status |=
1634                                                 USB_PORT_STAT_HIGH_SPEED;
1635                                         break;
1636                                 case USB_SPEED_LOW:
1637                                         dum->gadget.ep0->maxpacket = 8;
1638                                         dum->port_status |=
1639                                                 USB_PORT_STAT_LOW_SPEED;
1640                                         break;
1641                                 default:
1642                                         dum->gadget.speed = USB_SPEED_FULL;
1643                                         break;
1644                                 }
1645                         }
1646                 }
1647                 set_link_state (dum);
1648                 ((__le16 *) buf)[0] = cpu_to_le16 (dum->port_status);
1649                 ((__le16 *) buf)[1] = cpu_to_le16 (dum->port_status >> 16);
1650                 break;
1651         case SetHubFeature:
1652                 retval = -EPIPE;
1653                 break;
1654         case SetPortFeature:
1655                 switch (wValue) {
1656                 case USB_PORT_FEAT_SUSPEND:
1657                         if (dum->active) {
1658                                 dum->port_status |= USB_PORT_STAT_SUSPEND;
1659
1660                                 /* HNP would happen here; for now we
1661                                  * assume b_bus_req is always true.
1662                                  */
1663                                 set_link_state (dum);
1664                                 if (((1 << USB_DEVICE_B_HNP_ENABLE)
1665                                                 & dum->devstatus) != 0)
1666                                         dev_dbg (dummy_dev(dum),
1667                                                         "no HNP yet!\n");
1668                         }
1669                         break;
1670                 case USB_PORT_FEAT_POWER:
1671                         dum->port_status |= USB_PORT_STAT_POWER;
1672                         set_link_state (dum);
1673                         break;
1674                 case USB_PORT_FEAT_RESET:
1675                         /* if it's already enabled, disable */
1676                         dum->port_status &= ~(USB_PORT_STAT_ENABLE
1677                                         | USB_PORT_STAT_LOW_SPEED
1678                                         | USB_PORT_STAT_HIGH_SPEED);
1679                         dum->devstatus = 0;
1680                         /* 50msec reset signaling */
1681                         dum->re_timeout = jiffies + msecs_to_jiffies(50);
1682                         /* FALLS THROUGH */
1683                 default:
1684                         if ((dum->port_status & USB_PORT_STAT_POWER) != 0) {
1685                                 dum->port_status |= (1 << wValue);
1686                                 set_link_state (dum);
1687                         }
1688                 }
1689                 break;
1690
1691         default:
1692                 dev_dbg (dummy_dev(dum),
1693                         "hub control req%04x v%04x i%04x l%d\n",
1694                         typeReq, wValue, wIndex, wLength);
1695
1696                 /* "protocol stall" on error */
1697                 retval = -EPIPE;
1698         }
1699         spin_unlock_irqrestore (&dum->lock, flags);
1700
1701         if ((dum->port_status & PORT_C_MASK) != 0)
1702                 usb_hcd_poll_rh_status (hcd);
1703         return retval;
1704 }
1705
1706 static int dummy_bus_suspend (struct usb_hcd *hcd)
1707 {
1708         struct dummy *dum = hcd_to_dummy (hcd);
1709
1710         dev_dbg (&hcd->self.root_hub->dev, "%s\n", __func__);
1711
1712         spin_lock_irq (&dum->lock);
1713         dum->rh_state = DUMMY_RH_SUSPENDED;
1714         set_link_state (dum);
1715         hcd->state = HC_STATE_SUSPENDED;
1716         spin_unlock_irq (&dum->lock);
1717         return 0;
1718 }
1719
1720 static int dummy_bus_resume (struct usb_hcd *hcd)
1721 {
1722         struct dummy *dum = hcd_to_dummy (hcd);
1723         int rc = 0;
1724
1725         dev_dbg (&hcd->self.root_hub->dev, "%s\n", __func__);
1726
1727         spin_lock_irq (&dum->lock);
1728         if (!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags)) {
1729                 rc = -ESHUTDOWN;
1730         } else {
1731                 dum->rh_state = DUMMY_RH_RUNNING;
1732                 set_link_state (dum);
1733                 if (!list_empty(&dum->urbp_list))
1734                         mod_timer (&dum->timer, jiffies);
1735                 hcd->state = HC_STATE_RUNNING;
1736         }
1737         spin_unlock_irq (&dum->lock);
1738         return rc;
1739 }
1740
1741 /*-------------------------------------------------------------------------*/
1742
1743 static inline ssize_t
1744 show_urb (char *buf, size_t size, struct urb *urb)
1745 {
1746         int ep = usb_pipeendpoint (urb->pipe);
1747
1748         return snprintf (buf, size,
1749                 "urb/%p %s ep%d%s%s len %d/%d\n",
1750                 urb,
1751                 ({ char *s;
1752                  switch (urb->dev->speed) {
1753                  case USB_SPEED_LOW:    s = "ls"; break;
1754                  case USB_SPEED_FULL:   s = "fs"; break;
1755                  case USB_SPEED_HIGH:   s = "hs"; break;
1756                  default:               s = "?"; break;
1757                  }; s; }),
1758                 ep, ep ? (usb_pipein (urb->pipe) ? "in" : "out") : "",
1759                 ({ char *s; \
1760                  switch (usb_pipetype (urb->pipe)) { \
1761                  case PIPE_CONTROL:     s = ""; break; \
1762                  case PIPE_BULK:        s = "-bulk"; break; \
1763                  case PIPE_INTERRUPT:   s = "-int"; break; \
1764                  default:               s = "-iso"; break; \
1765                 }; s;}),
1766                 urb->actual_length, urb->transfer_buffer_length);
1767 }
1768
1769 static ssize_t
1770 show_urbs (struct device *dev, struct device_attribute *attr, char *buf)
1771 {
1772         struct usb_hcd          *hcd = dev_get_drvdata (dev);
1773         struct dummy            *dum = hcd_to_dummy (hcd);
1774         struct urbp             *urbp;
1775         size_t                  size = 0;
1776         unsigned long           flags;
1777
1778         spin_lock_irqsave (&dum->lock, flags);
1779         list_for_each_entry (urbp, &dum->urbp_list, urbp_list) {
1780                 size_t          temp;
1781
1782                 temp = show_urb (buf, PAGE_SIZE - size, urbp->urb);
1783                 buf += temp;
1784                 size += temp;
1785         }
1786         spin_unlock_irqrestore (&dum->lock, flags);
1787
1788         return size;
1789 }
1790 static DEVICE_ATTR (urbs, S_IRUGO, show_urbs, NULL);
1791
1792 static int dummy_start (struct usb_hcd *hcd)
1793 {
1794         struct dummy            *dum;
1795
1796         dum = hcd_to_dummy (hcd);
1797
1798         /*
1799          * MASTER side init ... we emulate a root hub that'll only ever
1800          * talk to one device (the slave side).  Also appears in sysfs,
1801          * just like more familiar pci-based HCDs.
1802          */
1803         spin_lock_init (&dum->lock);
1804         init_timer (&dum->timer);
1805         dum->timer.function = dummy_timer;
1806         dum->timer.data = (unsigned long) dum;
1807         dum->rh_state = DUMMY_RH_RUNNING;
1808
1809         INIT_LIST_HEAD (&dum->urbp_list);
1810
1811         hcd->power_budget = POWER_BUDGET;
1812         hcd->state = HC_STATE_RUNNING;
1813         hcd->uses_new_polling = 1;
1814
1815 #ifdef CONFIG_USB_OTG
1816         hcd->self.otg_port = 1;
1817 #endif
1818
1819         /* FIXME 'urbs' should be a per-device thing, maybe in usbcore */
1820         return device_create_file (dummy_dev(dum), &dev_attr_urbs);
1821 }
1822
1823 static void dummy_stop (struct usb_hcd *hcd)
1824 {
1825         struct dummy            *dum;
1826
1827         dum = hcd_to_dummy (hcd);
1828
1829         device_remove_file (dummy_dev(dum), &dev_attr_urbs);
1830         usb_gadget_unregister_driver (dum->driver);
1831         dev_info (dummy_dev(dum), "stopped\n");
1832 }
1833
1834 /*-------------------------------------------------------------------------*/
1835
1836 static int dummy_h_get_frame (struct usb_hcd *hcd)
1837 {
1838         return dummy_g_get_frame (NULL);
1839 }
1840
1841 static const struct hc_driver dummy_hcd = {
1842         .description =          (char *) driver_name,
1843         .product_desc =         "Dummy host controller",
1844         .hcd_priv_size =        sizeof(struct dummy),
1845
1846         .flags =                HCD_USB2,
1847
1848         .start =                dummy_start,
1849         .stop =                 dummy_stop,
1850
1851         .urb_enqueue =          dummy_urb_enqueue,
1852         .urb_dequeue =          dummy_urb_dequeue,
1853
1854         .get_frame_number =     dummy_h_get_frame,
1855
1856         .hub_status_data =      dummy_hub_status,
1857         .hub_control =          dummy_hub_control,
1858         .bus_suspend =          dummy_bus_suspend,
1859         .bus_resume =           dummy_bus_resume,
1860 };
1861
1862 static int dummy_hcd_probe(struct platform_device *pdev)
1863 {
1864         struct usb_hcd          *hcd;
1865         int                     retval;
1866
1867         dev_info(&pdev->dev, "%s, driver " DRIVER_VERSION "\n", driver_desc);
1868
1869         hcd = usb_create_hcd(&dummy_hcd, &pdev->dev, dev_name(&pdev->dev));
1870         if (!hcd)
1871                 return -ENOMEM;
1872         the_controller = hcd_to_dummy (hcd);
1873
1874         retval = usb_add_hcd(hcd, 0, 0);
1875         if (retval != 0) {
1876                 usb_put_hcd (hcd);
1877                 the_controller = NULL;
1878         }
1879         return retval;
1880 }
1881
1882 static int dummy_hcd_remove (struct platform_device *pdev)
1883 {
1884         struct usb_hcd          *hcd;
1885
1886         hcd = platform_get_drvdata (pdev);
1887         usb_remove_hcd (hcd);
1888         usb_put_hcd (hcd);
1889         the_controller = NULL;
1890         return 0;
1891 }
1892
1893 static int dummy_hcd_suspend (struct platform_device *pdev, pm_message_t state)
1894 {
1895         struct usb_hcd          *hcd;
1896         struct dummy            *dum;
1897         int                     rc = 0;
1898
1899         dev_dbg (&pdev->dev, "%s\n", __func__);
1900
1901         hcd = platform_get_drvdata (pdev);
1902         dum = hcd_to_dummy (hcd);
1903         if (dum->rh_state == DUMMY_RH_RUNNING) {
1904                 dev_warn(&pdev->dev, "Root hub isn't suspended!\n");
1905                 rc = -EBUSY;
1906         } else
1907                 clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
1908         return rc;
1909 }
1910
1911 static int dummy_hcd_resume (struct platform_device *pdev)
1912 {
1913         struct usb_hcd          *hcd;
1914
1915         dev_dbg (&pdev->dev, "%s\n", __func__);
1916
1917         hcd = platform_get_drvdata (pdev);
1918         set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
1919         usb_hcd_poll_rh_status (hcd);
1920         return 0;
1921 }
1922
1923 static struct platform_driver dummy_hcd_driver = {
1924         .probe          = dummy_hcd_probe,
1925         .remove         = dummy_hcd_remove,
1926         .suspend        = dummy_hcd_suspend,
1927         .resume         = dummy_hcd_resume,
1928         .driver         = {
1929                 .name   = (char *) driver_name,
1930                 .owner  = THIS_MODULE,
1931         },
1932 };
1933
1934 /*-------------------------------------------------------------------------*/
1935
1936 static struct platform_device *the_udc_pdev;
1937 static struct platform_device *the_hcd_pdev;
1938
1939 static int __init init (void)
1940 {
1941         int     retval = -ENOMEM;
1942
1943         if (usb_disabled ())
1944                 return -ENODEV;
1945
1946         the_hcd_pdev = platform_device_alloc(driver_name, -1);
1947         if (!the_hcd_pdev)
1948                 return retval;
1949         the_udc_pdev = platform_device_alloc(gadget_name, -1);
1950         if (!the_udc_pdev)
1951                 goto err_alloc_udc;
1952
1953         retval = platform_driver_register(&dummy_hcd_driver);
1954         if (retval < 0)
1955                 goto err_register_hcd_driver;
1956         retval = platform_driver_register(&dummy_udc_driver);
1957         if (retval < 0)
1958                 goto err_register_udc_driver;
1959
1960         retval = platform_device_add(the_hcd_pdev);
1961         if (retval < 0)
1962                 goto err_add_hcd;
1963         retval = platform_device_add(the_udc_pdev);
1964         if (retval < 0)
1965                 goto err_add_udc;
1966         return retval;
1967
1968 err_add_udc:
1969         platform_device_del(the_hcd_pdev);
1970 err_add_hcd:
1971         platform_driver_unregister(&dummy_udc_driver);
1972 err_register_udc_driver:
1973         platform_driver_unregister(&dummy_hcd_driver);
1974 err_register_hcd_driver:
1975         platform_device_put(the_udc_pdev);
1976 err_alloc_udc:
1977         platform_device_put(the_hcd_pdev);
1978         return retval;
1979 }
1980 module_init (init);
1981
1982 static void __exit cleanup (void)
1983 {
1984         platform_device_unregister(the_udc_pdev);
1985         platform_device_unregister(the_hcd_pdev);
1986         platform_driver_unregister(&dummy_udc_driver);
1987         platform_driver_unregister(&dummy_hcd_driver);
1988 }
1989 module_exit (cleanup);