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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                         /* 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         pdev->dev.power.power_state = state;
 904         usb_hcd_poll_rh_status (dummy_to_hcd (dum));
 905         return 0;
 906 }
 907
 908 static int dummy_udc_resume (struct platform_device *pdev)
 909 {
 910         struct dummy    *dum = platform_get_drvdata(pdev);
 911
 912         dev_dbg (&pdev->dev, "%s\n", __FUNCTION__);
 913         spin_lock_irq (&dum->lock);
 914         dum->udc_suspended = 0;
 915         set_link_state (dum);
 916         spin_unlock_irq (&dum->lock);
 917
 918         pdev->dev.power.power_state = PMSG_ON;
 919         usb_hcd_poll_rh_status (dummy_to_hcd (dum));
 920         return 0;
 921 }
 922
 923 static struct platform_driver dummy_udc_driver = {
 924         .probe          = dummy_udc_probe,
 925         .remove         = dummy_udc_remove,
 926         .suspend        = dummy_udc_suspend,
 927         .resume         = dummy_udc_resume,
 928         .driver         = {
 929                 .name   = (char *) gadget_name,
 930                 .owner  = THIS_MODULE,
 931         },
 932 };
 933
 934 /*-------------------------------------------------------------------------*/
 935
 936 /* MASTER/HOST SIDE DRIVER
 937  *
 938  * this uses the hcd framework to hook up to host side drivers.
 939  * its root hub will only have one device, otherwise it acts like
 940  * a normal host controller.
 941  *
 942  * when urbs are queued, they're just stuck on a list that we
 943  * scan in a timer callback.  that callback connects writes from
 944  * the host with reads from the device, and so on, based on the
 945  * usb 2.0 rules.
 946  */
 947
 948 static int dummy_urb_enqueue (
 949         struct usb_hcd                  *hcd,
 950         struct urb                      *urb,
 951         gfp_t                           mem_flags
 952 ) {
 953         struct dummy    *dum;
 954         struct urbp     *urbp;
 955         unsigned long   flags;
 956         int             rc;
 957
 958         if (!urb->transfer_buffer && urb->transfer_buffer_length)
 959                 return -EINVAL;
 960
 961         urbp = kmalloc (sizeof *urbp, mem_flags);
 962         if (!urbp)
 963                 return -ENOMEM;
 964         urbp->urb = urb;
 965
 966         dum = hcd_to_dummy (hcd);
 967         spin_lock_irqsave (&dum->lock, flags);
 968         rc = usb_hcd_link_urb_to_ep(hcd, urb);
 969         if (rc) {
 970                 kfree(urbp);
 971                 goto done;
 972         }
 973
 974         if (!dum->udev) {
 975                 dum->udev = urb->dev;
 976                 usb_get_dev (dum->udev);
 977         } else if (unlikely (dum->udev != urb->dev))
 978                 dev_err (dummy_dev(dum), "usb_device address has changed!\n");
 979
 980         list_add_tail (&urbp->urbp_list, &dum->urbp_list);
 981         urb->hcpriv = urbp;
 982         if (usb_pipetype (urb->pipe) == PIPE_CONTROL)
 983                 urb->error_count = 1;           /* mark as a new urb */
 984
 985         /* kick the scheduler, it'll do the rest */
 986         if (!timer_pending (&dum->timer))
 987                 mod_timer (&dum->timer, jiffies + 1);
 988
 989  done:
 990         spin_unlock_irqrestore(&dum->lock, flags);
 991         return rc;
 992 }
 993
 994 static int dummy_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
 995 {
 996         struct dummy    *dum;
 997         unsigned long   flags;
 998         int             rc;
 999
1000         /* giveback happens automatically in timer callback,
1001          * so make sure the callback happens */
1002         dum = hcd_to_dummy (hcd);
1003         spin_lock_irqsave (&dum->lock, flags);
1004
1005         rc = usb_hcd_check_unlink_urb(hcd, urb, status);
1006         if (!rc && dum->rh_state != DUMMY_RH_RUNNING &&
1007                         !list_empty(&dum->urbp_list))
1008                 mod_timer (&dum->timer, jiffies);
1009
1010         spin_unlock_irqrestore (&dum->lock, flags);
1011         return rc;
1012 }
1013
1014 /* transfer up to a frame's worth; caller must own lock */
1015 static int
1016 transfer(struct dummy *dum, struct urb *urb, struct dummy_ep *ep, int limit,
1017                 int *status)
1018 {
1019         struct dummy_request    *req;
1020
1021 top:
1022         /* if there's no request queued, the device is NAKing; return */
1023         list_for_each_entry (req, &ep->queue, queue) {
1024                 unsigned        host_len, dev_len, len;
1025                 int             is_short, to_host;
1026                 int             rescan = 0;
1027
1028                 /* 1..N packets of ep->ep.maxpacket each ... the last one
1029                  * may be short (including zero length).
1030                  *
1031                  * writer can send a zlp explicitly (length 0) or implicitly
1032                  * (length mod maxpacket zero, and 'zero' flag); they always
1033                  * terminate reads.
1034                  */
1035                 host_len = urb->transfer_buffer_length - urb->actual_length;
1036                 dev_len = req->req.length - req->req.actual;
1037                 len = min (host_len, dev_len);
1038
1039                 /* FIXME update emulated data toggle too */
1040
1041                 to_host = usb_pipein (urb->pipe);
1042                 if (unlikely (len == 0))
1043                         is_short = 1;
1044                 else {
1045                         char            *ubuf, *rbuf;
1046
1047                         /* not enough bandwidth left? */
1048                         if (limit < ep->ep.maxpacket && limit < len)
1049                                 break;
1050                         len = min (len, (unsigned) limit);
1051                         if (len == 0)
1052                                 break;
1053
1054                         /* use an extra pass for the final short packet */
1055                         if (len > ep->ep.maxpacket) {
1056                                 rescan = 1;
1057                                 len -= (len % ep->ep.maxpacket);
1058                         }
1059                         is_short = (len % ep->ep.maxpacket) != 0;
1060
1061                         /* else transfer packet(s) */
1062                         ubuf = urb->transfer_buffer + urb->actual_length;
1063                         rbuf = req->req.buf + req->req.actual;
1064                         if (to_host)
1065                                 memcpy (ubuf, rbuf, len);
1066                         else
1067                                 memcpy (rbuf, ubuf, len);
1068                         ep->last_io = jiffies;
1069
1070                         limit -= len;
1071                         urb->actual_length += len;
1072                         req->req.actual += len;
1073                 }
1074
1075                 /* short packets terminate, maybe with overflow/underflow.
1076                  * it's only really an error to write too much.
1077                  *
1078                  * partially filling a buffer optionally blocks queue advances
1079                  * (so completion handlers can clean up the queue) but we don't
1080                  * need to emulate such data-in-flight.
1081                  */
1082                 if (is_short) {
1083                         if (host_len == dev_len) {
1084                                 req->req.status = 0;
1085                                 *status = 0;
1086                         } else if (to_host) {
1087                                 req->req.status = 0;
1088                                 if (dev_len > host_len)
1089                                         *status = -EOVERFLOW;
1090                                 else
1091                                         *status = 0;
1092                         } else if (!to_host) {
1093                                 *status = 0;
1094                                 if (host_len > dev_len)
1095                                         req->req.status = -EOVERFLOW;
1096                                 else
1097                                         req->req.status = 0;
1098                         }
1099
1100                 /* many requests terminate without a short packet */
1101                 } else {
1102                         if (req->req.length == req->req.actual
1103                                         && !req->req.zero)
1104                                 req->req.status = 0;
1105                         if (urb->transfer_buffer_length == urb->actual_length
1106                                         && !(urb->transfer_flags
1107                                                 & URB_ZERO_PACKET))
1108                                 *status = 0;
1109                 }
1110
1111                 /* device side completion --> continuable */
1112                 if (req->req.status != -EINPROGRESS) {
1113                         list_del_init (&req->queue);
1114
1115                         spin_unlock (&dum->lock);
1116                         req->req.complete (&ep->ep, &req->req);
1117                         spin_lock (&dum->lock);
1118
1119                         /* requests might have been unlinked... */
1120                         rescan = 1;
1121                 }
1122
1123                 /* host side completion --> terminate */
1124                 if (*status != -EINPROGRESS)
1125                         break;
1126
1127                 /* rescan to continue with any other queued i/o */
1128                 if (rescan)
1129                         goto top;
1130         }
1131         return limit;
1132 }
1133
1134 static int periodic_bytes (struct dummy *dum, struct dummy_ep *ep)
1135 {
1136         int     limit = ep->ep.maxpacket;
1137
1138         if (dum->gadget.speed == USB_SPEED_HIGH) {
1139                 int     tmp;
1140
1141                 /* high bandwidth mode */
1142                 tmp = le16_to_cpu(ep->desc->wMaxPacketSize);
1143                 tmp = (tmp >> 11) & 0x03;
1144                 tmp *= 8 /* applies to entire frame */;
1145                 limit += limit * tmp;
1146         }
1147         return limit;
1148 }
1149
1150 #define is_active(dum)  ((dum->port_status & \
1151                 (USB_PORT_STAT_CONNECTION | USB_PORT_STAT_ENABLE | \
1152                         USB_PORT_STAT_SUSPEND)) \
1153                 == (USB_PORT_STAT_CONNECTION | USB_PORT_STAT_ENABLE))
1154
1155 static struct dummy_ep *find_endpoint (struct dummy *dum, u8 address)
1156 {
1157         int             i;
1158
1159         if (!is_active (dum))
1160                 return NULL;
1161         if ((address & ~USB_DIR_IN) == 0)
1162                 return &dum->ep [0];
1163         for (i = 1; i < DUMMY_ENDPOINTS; i++) {
1164                 struct dummy_ep *ep = &dum->ep [i];
1165
1166                 if (!ep->desc)
1167                         continue;
1168                 if (ep->desc->bEndpointAddress == address)
1169                         return ep;
1170         }
1171         return NULL;
1172 }
1173
1174 #undef is_active
1175
1176 #define Dev_Request     (USB_TYPE_STANDARD | USB_RECIP_DEVICE)
1177 #define Dev_InRequest   (Dev_Request | USB_DIR_IN)
1178 #define Intf_Request    (USB_TYPE_STANDARD | USB_RECIP_INTERFACE)
1179 #define Intf_InRequest  (Intf_Request | USB_DIR_IN)
1180 #define Ep_Request      (USB_TYPE_STANDARD | USB_RECIP_ENDPOINT)
1181 #define Ep_InRequest    (Ep_Request | USB_DIR_IN)
1182
1183 /* drive both sides of the transfers; looks like irq handlers to
1184  * both drivers except the callbacks aren't in_irq().
1185  */
1186 static void dummy_timer (unsigned long _dum)
1187 {
1188         struct dummy            *dum = (struct dummy *) _dum;
1189         struct urbp             *urbp, *tmp;
1190         unsigned long           flags;
1191         int                     limit, total;
1192         int                     i;
1193
1194         /* simplistic model for one frame's bandwidth */
1195         switch (dum->gadget.speed) {
1196         case USB_SPEED_LOW:
1197                 total = 8/*bytes*/ * 12/*packets*/;
1198                 break;
1199         case USB_SPEED_FULL:
1200                 total = 64/*bytes*/ * 19/*packets*/;
1201                 break;
1202         case USB_SPEED_HIGH:
1203                 total = 512/*bytes*/ * 13/*packets*/ * 8/*uframes*/;
1204                 break;
1205         default:
1206                 dev_err (dummy_dev(dum), "bogus device speed\n");
1207                 return;
1208         }
1209
1210         /* FIXME if HZ != 1000 this will probably misbehave ... */
1211
1212         /* look at each urb queued by the host side driver */
1213         spin_lock_irqsave (&dum->lock, flags);
1214
1215         if (!dum->udev) {
1216                 dev_err (dummy_dev(dum),
1217                                 "timer fired with no URBs pending?\n");
1218                 spin_unlock_irqrestore (&dum->lock, flags);
1219                 return;
1220         }
1221
1222         for (i = 0; i < DUMMY_ENDPOINTS; i++) {
1223                 if (!ep_name [i])
1224                         break;
1225                 dum->ep [i].already_seen = 0;
1226         }
1227
1228 restart:
1229         list_for_each_entry_safe (urbp, tmp, &dum->urbp_list, urbp_list) {
1230                 struct urb              *urb;
1231                 struct dummy_request    *req;
1232                 u8                      address;
1233                 struct dummy_ep         *ep = NULL;
1234                 int                     type;
1235                 int                     status = -EINPROGRESS;
1236
1237                 urb = urbp->urb;
1238                 if (urb->unlinked)
1239                         goto return_urb;
1240                 else if (dum->rh_state != DUMMY_RH_RUNNING)
1241                         continue;
1242                 type = usb_pipetype (urb->pipe);
1243
1244                 /* used up this frame's non-periodic bandwidth?
1245                  * FIXME there's infinite bandwidth for control and
1246                  * periodic transfers ... unrealistic.
1247                  */
1248                 if (total <= 0 && type == PIPE_BULK)
1249                         continue;
1250
1251                 /* find the gadget's ep for this request (if configured) */
1252                 address = usb_pipeendpoint (urb->pipe);
1253                 if (usb_pipein (urb->pipe))
1254                         address |= USB_DIR_IN;
1255                 ep = find_endpoint(dum, address);
1256                 if (!ep) {
1257                         /* set_configuration() disagreement */
1258                         dev_dbg (dummy_dev(dum),
1259                                 "no ep configured for urb %p\n",
1260                                 urb);
1261                         status = -EPROTO;
1262                         goto return_urb;
1263                 }
1264
1265                 if (ep->already_seen)
1266                         continue;
1267                 ep->already_seen = 1;
1268                 if (ep == &dum->ep [0] && urb->error_count) {
1269                         ep->setup_stage = 1;    /* a new urb */
1270                         urb->error_count = 0;
1271                 }
1272                 if (ep->halted && !ep->setup_stage) {
1273                         /* NOTE: must not be iso! */
1274                         dev_dbg (dummy_dev(dum), "ep %s halted, urb %p\n",
1275                                         ep->ep.name, urb);
1276                         status = -EPIPE;
1277                         goto return_urb;
1278                 }
1279                 /* FIXME make sure both ends agree on maxpacket */
1280
1281                 /* handle control requests */
1282                 if (ep == &dum->ep [0] && ep->setup_stage) {
1283                         struct usb_ctrlrequest          setup;
1284                         int                             value = 1;
1285                         struct dummy_ep                 *ep2;
1286                         unsigned                        w_index;
1287                         unsigned                        w_value;
1288
1289                         setup = *(struct usb_ctrlrequest*) urb->setup_packet;
1290                         w_index = le16_to_cpu(setup.wIndex);
1291                         w_value = le16_to_cpu(setup.wValue);
1292                         if (le16_to_cpu(setup.wLength) !=
1293                                         urb->transfer_buffer_length) {
1294                                 status = -EOVERFLOW;
1295                                 goto return_urb;
1296                         }
1297
1298                         /* paranoia, in case of stale queued data */
1299                         list_for_each_entry (req, &ep->queue, queue) {
1300                                 list_del_init (&req->queue);
1301                                 req->req.status = -EOVERFLOW;
1302                                 dev_dbg (udc_dev(dum), "stale req = %p\n",
1303                                                 req);
1304
1305                                 spin_unlock (&dum->lock);
1306                                 req->req.complete (&ep->ep, &req->req);
1307                                 spin_lock (&dum->lock);
1308                                 ep->already_seen = 0;
1309                                 goto restart;
1310                         }
1311
1312                         /* gadget driver never sees set_address or operations
1313                          * on standard feature flags.  some hardware doesn't
1314                          * even expose them.
1315                          */
1316                         ep->last_io = jiffies;
1317                         ep->setup_stage = 0;
1318                         ep->halted = 0;
1319                         switch (setup.bRequest) {
1320                         case USB_REQ_SET_ADDRESS:
1321                                 if (setup.bRequestType != Dev_Request)
1322                                         break;
1323                                 dum->address = w_value;
1324                                 status = 0;
1325                                 dev_dbg (udc_dev(dum), "set_address = %d\n",
1326                                                 w_value);
1327                                 value = 0;
1328                                 break;
1329                         case USB_REQ_SET_FEATURE:
1330                                 if (setup.bRequestType == Dev_Request) {
1331                                         value = 0;
1332                                         switch (w_value) {
1333                                         case USB_DEVICE_REMOTE_WAKEUP:
1334                                                 break;
1335                                         case USB_DEVICE_B_HNP_ENABLE:
1336                                                 dum->gadget.b_hnp_enable = 1;
1337                                                 break;
1338                                         case USB_DEVICE_A_HNP_SUPPORT:
1339                                                 dum->gadget.a_hnp_support = 1;
1340                                                 break;
1341                                         case USB_DEVICE_A_ALT_HNP_SUPPORT:
1342                                                 dum->gadget.a_alt_hnp_support
1343                                                         = 1;
1344                                                 break;
1345                                         default:
1346                                                 value = -EOPNOTSUPP;
1347                                         }
1348                                         if (value == 0) {
1349                                                 dum->devstatus |=
1350                                                         (1 << w_value);
1351                                                 status = 0;
1352                                         }
1353
1354                                 } else if (setup.bRequestType == Ep_Request) {
1355                                         // endpoint halt
1356                                         ep2 = find_endpoint (dum, w_index);
1357                                         if (!ep2) {
1358                                                 value = -EOPNOTSUPP;
1359                                                 break;
1360                                         }
1361                                         ep2->halted = 1;
1362                                         value = 0;
1363                                         status = 0;
1364                                 }
1365                                 break;
1366                         case USB_REQ_CLEAR_FEATURE:
1367                                 if (setup.bRequestType == Dev_Request) {
1368                                         switch (w_value) {
1369                                         case USB_DEVICE_REMOTE_WAKEUP:
1370                                                 dum->devstatus &= ~(1 <<
1371                                                         USB_DEVICE_REMOTE_WAKEUP);
1372                                                 value = 0;
1373                                                 status = 0;
1374                                                 break;
1375                                         default:
1376                                                 value = -EOPNOTSUPP;
1377                                                 break;
1378                                         }
1379                                 } else if (setup.bRequestType == Ep_Request) {
1380                                         // endpoint halt
1381                                         ep2 = find_endpoint (dum, w_index);
1382                                         if (!ep2) {
1383                                                 value = -EOPNOTSUPP;
1384                                                 break;
1385                                         }
1386                                         ep2->halted = 0;
1387                                         value = 0;
1388                                         status = 0;
1389                                 }
1390                                 break;
1391                         case USB_REQ_GET_STATUS:
1392                                 if (setup.bRequestType == Dev_InRequest
1393                                                 || setup.bRequestType
1394                                                         == Intf_InRequest
1395                                                 || setup.bRequestType
1396                                                         == Ep_InRequest
1397                                                 ) {
1398                                         char *buf;
1399
1400                                         // device: remote wakeup, selfpowered
1401                                         // interface: nothing
1402                                         // endpoint: halt
1403                                         buf = (char *)urb->transfer_buffer;
1404                                         if (urb->transfer_buffer_length > 0) {
1405                                                 if (setup.bRequestType ==
1406                                                                 Ep_InRequest) {
1407         ep2 = find_endpoint (dum, w_index);
1408         if (!ep2) {
1409                 value = -EOPNOTSUPP;
1410                 break;
1411         }
1412         buf [0] = ep2->halted;
1413                                                 } else if (setup.bRequestType ==
1414                                                                 Dev_InRequest) {
1415                                                         buf [0] = (u8)
1416                                                                 dum->devstatus;
1417                                                 } else
1418                                                         buf [0] = 0;
1419                                         }
1420                                         if (urb->transfer_buffer_length > 1)
1421                                                 buf [1] = 0;
1422                                         urb->actual_length = min (2,
1423                                                 urb->transfer_buffer_length);
1424                                         value = 0;
1425                                         status = 0;
1426                                 }
1427                                 break;
1428                         }
1429
1430                         /* gadget driver handles all other requests.  block
1431                          * until setup() returns; no reentrancy issues etc.
1432                          */
1433                         if (value > 0) {
1434                                 spin_unlock (&dum->lock);
1435                                 value = dum->driver->setup (&dum->gadget,
1436                                                 &setup);
1437                                 spin_lock (&dum->lock);
1438
1439                                 if (value >= 0) {
1440                                         /* no delays (max 64KB data stage) */
1441                                         limit = 64*1024;
1442                                         goto treat_control_like_bulk;
1443                                 }
1444                                 /* error, see below */
1445                         }
1446
1447                         if (value < 0) {
1448                                 if (value != -EOPNOTSUPP)
1449                                         dev_dbg (udc_dev(dum),
1450                                                 "setup --> %d\n",
1451                                                 value);
1452                                 status = -EPIPE;
1453                                 urb->actual_length = 0;
1454                         }
1455
1456                         goto return_urb;
1457                 }
1458
1459                 /* non-control requests */
1460                 limit = total;
1461                 switch (usb_pipetype (urb->pipe)) {
1462                 case PIPE_ISOCHRONOUS:
1463                         /* FIXME is it urb->interval since the last xfer?
1464                          * use urb->iso_frame_desc[i].
1465                          * complete whether or not ep has requests queued.
1466                          * report random errors, to debug drivers.
1467                          */
1468                         limit = max (limit, periodic_bytes (dum, ep));
1469                         status = -ENOSYS;
1470                         break;
1471
1472                 case PIPE_INTERRUPT:
1473                         /* FIXME is it urb->interval since the last xfer?
1474                          * this almost certainly polls too fast.
1475                          */
1476                         limit = max (limit, periodic_bytes (dum, ep));
1477                         /* FALLTHROUGH */
1478
1479                 // case PIPE_BULK:  case PIPE_CONTROL:
1480                 default:
1481                 treat_control_like_bulk:
1482                         ep->last_io = jiffies;
1483                         total = transfer(dum, urb, ep, limit, &status);
1484                         break;
1485                 }
1486
1487                 /* incomplete transfer? */
1488                 if (status == -EINPROGRESS)
1489                         continue;
1490
1491 return_urb:
1492                 list_del (&urbp->urbp_list);
1493                 kfree (urbp);
1494                 if (ep)
1495                         ep->already_seen = ep->setup_stage = 0;
1496
1497                 usb_hcd_unlink_urb_from_ep(dummy_to_hcd(dum), urb);
1498                 spin_unlock (&dum->lock);
1499                 usb_hcd_giveback_urb(dummy_to_hcd(dum), urb, status);
1500                 spin_lock (&dum->lock);
1501
1502                 goto restart;
1503         }
1504
1505         if (list_empty (&dum->urbp_list)) {
1506                 usb_put_dev (dum->udev);
1507                 dum->udev = NULL;
1508         } else if (dum->rh_state == DUMMY_RH_RUNNING) {
1509                 /* want a 1 msec delay here */
1510                 mod_timer (&dum->timer, jiffies + msecs_to_jiffies(1));
1511         }
1512
1513         spin_unlock_irqrestore (&dum->lock, flags);
1514 }
1515
1516 /*-------------------------------------------------------------------------*/
1517
1518 #define PORT_C_MASK \
1519         ((USB_PORT_STAT_C_CONNECTION \
1520         | USB_PORT_STAT_C_ENABLE \
1521         | USB_PORT_STAT_C_SUSPEND \
1522         | USB_PORT_STAT_C_OVERCURRENT \
1523         | USB_PORT_STAT_C_RESET) << 16)
1524
1525 static int dummy_hub_status (struct usb_hcd *hcd, char *buf)
1526 {
1527         struct dummy            *dum;
1528         unsigned long           flags;
1529         int                     retval = 0;
1530
1531         dum = hcd_to_dummy (hcd);
1532
1533         spin_lock_irqsave (&dum->lock, flags);
1534         if (!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags))
1535                 goto done;
1536
1537         if (dum->resuming && time_after_eq (jiffies, dum->re_timeout)) {
1538                 dum->port_status |= (USB_PORT_STAT_C_SUSPEND << 16);
1539                 dum->port_status &= ~USB_PORT_STAT_SUSPEND;
1540                 set_link_state (dum);
1541         }
1542
1543         if ((dum->port_status & PORT_C_MASK) != 0) {
1544                 *buf = (1 << 1);
1545                 dev_dbg (dummy_dev(dum), "port status 0x%08x has changes\n",
1546                                 dum->port_status);
1547                 retval = 1;
1548                 if (dum->rh_state == DUMMY_RH_SUSPENDED)
1549                         usb_hcd_resume_root_hub (hcd);
1550         }
1551 done:
1552         spin_unlock_irqrestore (&dum->lock, flags);
1553         return retval;
1554 }
1555
1556 static inline void
1557 hub_descriptor (struct usb_hub_descriptor *desc)
1558 {
1559         memset (desc, 0, sizeof *desc);
1560         desc->bDescriptorType = 0x29;
1561         desc->bDescLength = 9;
1562         desc->wHubCharacteristics = (__force __u16)
1563                         (__constant_cpu_to_le16 (0x0001));
1564         desc->bNbrPorts = 1;
1565         desc->bitmap [0] = 0xff;
1566         desc->bitmap [1] = 0xff;
1567 }
1568
1569 static int dummy_hub_control (
1570         struct usb_hcd  *hcd,
1571         u16             typeReq,
1572         u16             wValue,
1573         u16             wIndex,
1574         char            *buf,
1575         u16             wLength
1576 ) {
1577         struct dummy    *dum;
1578         int             retval = 0;
1579         unsigned long   flags;
1580
1581         if (!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags))
1582                 return -ETIMEDOUT;
1583
1584         dum = hcd_to_dummy (hcd);
1585         spin_lock_irqsave (&dum->lock, flags);
1586         switch (typeReq) {
1587         case ClearHubFeature:
1588                 break;
1589         case ClearPortFeature:
1590                 switch (wValue) {
1591                 case USB_PORT_FEAT_SUSPEND:
1592                         if (dum->port_status & USB_PORT_STAT_SUSPEND) {
1593                                 /* 20msec resume signaling */
1594                                 dum->resuming = 1;
1595                                 dum->re_timeout = jiffies +
1596                                                 msecs_to_jiffies(20);
1597                         }
1598                         break;
1599                 case USB_PORT_FEAT_POWER:
1600                         if (dum->port_status & USB_PORT_STAT_POWER)
1601                                 dev_dbg (dummy_dev(dum), "power-off\n");
1602                         /* FALLS THROUGH */
1603                 default:
1604                         dum->port_status &= ~(1 << wValue);
1605                         set_link_state (dum);
1606                 }
1607                 break;
1608         case GetHubDescriptor:
1609                 hub_descriptor ((struct usb_hub_descriptor *) buf);
1610                 break;
1611         case GetHubStatus:
1612                 *(__le32 *) buf = __constant_cpu_to_le32 (0);
1613                 break;
1614         case GetPortStatus:
1615                 if (wIndex != 1)
1616                         retval = -EPIPE;
1617
1618                 /* whoever resets or resumes must GetPortStatus to
1619                  * complete it!!
1620                  */
1621                 if (dum->resuming &&
1622                                 time_after_eq (jiffies, dum->re_timeout)) {
1623                         dum->port_status |= (USB_PORT_STAT_C_SUSPEND << 16);
1624                         dum->port_status &= ~USB_PORT_STAT_SUSPEND;
1625                 }
1626                 if ((dum->port_status & USB_PORT_STAT_RESET) != 0 &&
1627                                 time_after_eq (jiffies, dum->re_timeout)) {
1628                         dum->port_status |= (USB_PORT_STAT_C_RESET << 16);
1629                         dum->port_status &= ~USB_PORT_STAT_RESET;
1630                         if (dum->pullup) {
1631                                 dum->port_status |= USB_PORT_STAT_ENABLE;
1632                                 /* give it the best speed we agree on */
1633                                 dum->gadget.speed = dum->driver->speed;
1634                                 dum->gadget.ep0->maxpacket = 64;
1635                                 switch (dum->gadget.speed) {
1636                                 case USB_SPEED_HIGH:
1637                                         dum->port_status |=
1638                                                 USB_PORT_STAT_HIGH_SPEED;
1639                                         break;
1640                                 case USB_SPEED_LOW:
1641                                         dum->gadget.ep0->maxpacket = 8;
1642                                         dum->port_status |=
1643                                                 USB_PORT_STAT_LOW_SPEED;
1644                                         break;
1645                                 default:
1646                                         dum->gadget.speed = USB_SPEED_FULL;
1647                                         break;
1648                                 }
1649                         }
1650                 }
1651                 set_link_state (dum);
1652                 ((__le16 *) buf)[0] = cpu_to_le16 (dum->port_status);
1653                 ((__le16 *) buf)[1] = cpu_to_le16 (dum->port_status >> 16);
1654                 break;
1655         case SetHubFeature:
1656                 retval = -EPIPE;
1657                 break;
1658         case SetPortFeature:
1659                 switch (wValue) {
1660                 case USB_PORT_FEAT_SUSPEND:
1661                         if (dum->active) {
1662                                 dum->port_status |= USB_PORT_STAT_SUSPEND;
1663
1664                                 /* HNP would happen here; for now we
1665                                  * assume b_bus_req is always true.
1666                                  */
1667                                 set_link_state (dum);
1668                                 if (((1 << USB_DEVICE_B_HNP_ENABLE)
1669                                                 & dum->devstatus) != 0)
1670                                         dev_dbg (dummy_dev(dum),
1671                                                         "no HNP yet!\n");
1672                         }
1673                         break;
1674                 case USB_PORT_FEAT_POWER:
1675                         dum->port_status |= USB_PORT_STAT_POWER;
1676                         set_link_state (dum);
1677                         break;
1678                 case USB_PORT_FEAT_RESET:
1679                         /* if it's already enabled, disable */
1680                         dum->port_status &= ~(USB_PORT_STAT_ENABLE
1681                                         | USB_PORT_STAT_LOW_SPEED
1682                                         | USB_PORT_STAT_HIGH_SPEED);
1683                         dum->devstatus = 0;
1684                         /* 50msec reset signaling */
1685                         dum->re_timeout = jiffies + msecs_to_jiffies(50);
1686                         /* FALLS THROUGH */
1687                 default:
1688                         if ((dum->port_status & USB_PORT_STAT_POWER) != 0) {
1689                                 dum->port_status |= (1 << wValue);
1690                                 set_link_state (dum);
1691                         }
1692                 }
1693                 break;
1694
1695         default:
1696                 dev_dbg (dummy_dev(dum),
1697                         "hub control req%04x v%04x i%04x l%d\n",
1698                         typeReq, wValue, wIndex, wLength);
1699
1700                 /* "protocol stall" on error */
1701                 retval = -EPIPE;
1702         }
1703         spin_unlock_irqrestore (&dum->lock, flags);
1704
1705         if ((dum->port_status & PORT_C_MASK) != 0)
1706                 usb_hcd_poll_rh_status (hcd);
1707         return retval;
1708 }
1709
1710 static int dummy_bus_suspend (struct usb_hcd *hcd)
1711 {
1712         struct dummy *dum = hcd_to_dummy (hcd);
1713
1714         dev_dbg (&hcd->self.root_hub->dev, "%s\n", __FUNCTION__);
1715
1716         spin_lock_irq (&dum->lock);
1717         dum->rh_state = DUMMY_RH_SUSPENDED;
1718         set_link_state (dum);
1719         hcd->state = HC_STATE_SUSPENDED;
1720         spin_unlock_irq (&dum->lock);
1721         return 0;
1722 }
1723
1724 static int dummy_bus_resume (struct usb_hcd *hcd)
1725 {
1726         struct dummy *dum = hcd_to_dummy (hcd);
1727         int rc = 0;
1728
1729         dev_dbg (&hcd->self.root_hub->dev, "%s\n", __FUNCTION__);
1730
1731         spin_lock_irq (&dum->lock);
1732         if (!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags)) {
1733                 rc = -ESHUTDOWN;
1734         } else {
1735                 dum->rh_state = DUMMY_RH_RUNNING;
1736                 set_link_state (dum);
1737                 if (!list_empty(&dum->urbp_list))
1738                         mod_timer (&dum->timer, jiffies);
1739                 hcd->state = HC_STATE_RUNNING;
1740         }
1741         spin_unlock_irq (&dum->lock);
1742         return rc;
1743 }
1744
1745 /*-------------------------------------------------------------------------*/
1746
1747 static inline ssize_t
1748 show_urb (char *buf, size_t size, struct urb *urb)
1749 {
1750         int ep = usb_pipeendpoint (urb->pipe);
1751
1752         return snprintf (buf, size,
1753                 "urb/%p %s ep%d%s%s len %d/%d\n",
1754                 urb,
1755                 ({ char *s;
1756                  switch (urb->dev->speed) {
1757                  case USB_SPEED_LOW:    s = "ls"; break;
1758                  case USB_SPEED_FULL:   s = "fs"; break;
1759                  case USB_SPEED_HIGH:   s = "hs"; break;
1760                  default:               s = "?"; break;
1761                  }; s; }),
1762                 ep, ep ? (usb_pipein (urb->pipe) ? "in" : "out") : "",
1763                 ({ char *s; \
1764                  switch (usb_pipetype (urb->pipe)) { \
1765                  case PIPE_CONTROL:     s = ""; break; \
1766                  case PIPE_BULK:        s = "-bulk"; break; \
1767                  case PIPE_INTERRUPT:   s = "-int"; break; \
1768                  default:               s = "-iso"; break; \
1769                 }; s;}),
1770                 urb->actual_length, urb->transfer_buffer_length);
1771 }
1772
1773 static ssize_t
1774 show_urbs (struct device *dev, struct device_attribute *attr, char *buf)
1775 {
1776         struct usb_hcd          *hcd = dev_get_drvdata (dev);
1777         struct dummy            *dum = hcd_to_dummy (hcd);
1778         struct urbp             *urbp;
1779         size_t                  size = 0;
1780         unsigned long           flags;
1781
1782         spin_lock_irqsave (&dum->lock, flags);
1783         list_for_each_entry (urbp, &dum->urbp_list, urbp_list) {
1784                 size_t          temp;
1785
1786                 temp = show_urb (buf, PAGE_SIZE - size, urbp->urb);
1787                 buf += temp;
1788                 size += temp;
1789         }
1790         spin_unlock_irqrestore (&dum->lock, flags);
1791
1792         return size;
1793 }
1794 static DEVICE_ATTR (urbs, S_IRUGO, show_urbs, NULL);
1795
1796 static int dummy_start (struct usb_hcd *hcd)
1797 {
1798         struct dummy            *dum;
1799
1800         dum = hcd_to_dummy (hcd);
1801
1802         /*
1803          * MASTER side init ... we emulate a root hub that'll only ever
1804          * talk to one device (the slave side).  Also appears in sysfs,
1805          * just like more familiar pci-based HCDs.
1806          */
1807         spin_lock_init (&dum->lock);
1808         init_timer (&dum->timer);
1809         dum->timer.function = dummy_timer;
1810         dum->timer.data = (unsigned long) dum;
1811         dum->rh_state = DUMMY_RH_RUNNING;
1812
1813         INIT_LIST_HEAD (&dum->urbp_list);
1814
1815         hcd->power_budget = POWER_BUDGET;
1816         hcd->state = HC_STATE_RUNNING;
1817         hcd->uses_new_polling = 1;
1818
1819 #ifdef CONFIG_USB_OTG
1820         hcd->self.otg_port = 1;
1821 #endif
1822
1823         /* FIXME 'urbs' should be a per-device thing, maybe in usbcore */
1824         return device_create_file (dummy_dev(dum), &dev_attr_urbs);
1825 }
1826
1827 static void dummy_stop (struct usb_hcd *hcd)
1828 {
1829         struct dummy            *dum;
1830
1831         dum = hcd_to_dummy (hcd);
1832
1833         device_remove_file (dummy_dev(dum), &dev_attr_urbs);
1834         usb_gadget_unregister_driver (dum->driver);
1835         dev_info (dummy_dev(dum), "stopped\n");
1836 }
1837
1838 /*-------------------------------------------------------------------------*/
1839
1840 static int dummy_h_get_frame (struct usb_hcd *hcd)
1841 {
1842         return dummy_g_get_frame (NULL);
1843 }
1844
1845 static const struct hc_driver dummy_hcd = {
1846         .description =          (char *) driver_name,
1847         .product_desc =         "Dummy host controller",
1848         .hcd_priv_size =        sizeof(struct dummy),
1849
1850         .flags =                HCD_USB2,
1851
1852         .start =                dummy_start,
1853         .stop =                 dummy_stop,
1854
1855         .urb_enqueue =          dummy_urb_enqueue,
1856         .urb_dequeue =          dummy_urb_dequeue,
1857
1858         .get_frame_number =     dummy_h_get_frame,
1859
1860         .hub_status_data =      dummy_hub_status,
1861         .hub_control =          dummy_hub_control,
1862         .bus_suspend =          dummy_bus_suspend,
1863         .bus_resume =           dummy_bus_resume,
1864 };
1865
1866 static int dummy_hcd_probe(struct platform_device *pdev)
1867 {
1868         struct usb_hcd          *hcd;
1869         int                     retval;
1870
1871         dev_info(&pdev->dev, "%s, driver " DRIVER_VERSION "\n", driver_desc);
1872
1873         hcd = usb_create_hcd(&dummy_hcd, &pdev->dev, pdev->dev.bus_id);
1874         if (!hcd)
1875                 return -ENOMEM;
1876         the_controller = hcd_to_dummy (hcd);
1877
1878         retval = usb_add_hcd(hcd, 0, 0);
1879         if (retval != 0) {
1880                 usb_put_hcd (hcd);
1881                 the_controller = NULL;
1882         }
1883         return retval;
1884 }
1885
1886 static int dummy_hcd_remove (struct platform_device *pdev)
1887 {
1888         struct usb_hcd          *hcd;
1889
1890         hcd = platform_get_drvdata (pdev);
1891         usb_remove_hcd (hcd);
1892         usb_put_hcd (hcd);
1893         the_controller = NULL;
1894         return 0;
1895 }
1896
1897 static int dummy_hcd_suspend (struct platform_device *pdev, pm_message_t state)
1898 {
1899         struct usb_hcd          *hcd;
1900         struct dummy            *dum;
1901         int                     rc = 0;
1902
1903         dev_dbg (&pdev->dev, "%s\n", __FUNCTION__);
1904
1905         hcd = platform_get_drvdata (pdev);
1906         dum = hcd_to_dummy (hcd);
1907         if (dum->rh_state == DUMMY_RH_RUNNING) {
1908                 dev_warn(&pdev->dev, "Root hub isn't suspended!\n");
1909                 rc = -EBUSY;
1910         } else
1911                 clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
1912         return rc;
1913 }
1914
1915 static int dummy_hcd_resume (struct platform_device *pdev)
1916 {
1917         struct usb_hcd          *hcd;
1918
1919         dev_dbg (&pdev->dev, "%s\n", __FUNCTION__);
1920
1921         hcd = platform_get_drvdata (pdev);
1922         set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
1923         usb_hcd_poll_rh_status (hcd);
1924         return 0;
1925 }
1926
1927 static struct platform_driver dummy_hcd_driver = {
1928         .probe          = dummy_hcd_probe,
1929         .remove         = dummy_hcd_remove,
1930         .suspend        = dummy_hcd_suspend,
1931         .resume         = dummy_hcd_resume,
1932         .driver         = {
1933                 .name   = (char *) driver_name,
1934                 .owner  = THIS_MODULE,
1935         },
1936 };
1937
1938 /*-------------------------------------------------------------------------*/
1939
1940 /* These don't need to do anything because the pdev structures are
1941  * statically allocated. */
1942 static void
1943 dummy_udc_release (struct device *dev) {}
1944
1945 static void
1946 dummy_hcd_release (struct device *dev) {}
1947
1948 static struct platform_device           the_udc_pdev = {
1949         .name           = (char *) gadget_name,
1950         .id             = -1,
1951         .dev            = {
1952                 .release        = dummy_udc_release,
1953         },
1954 };
1955
1956 static struct platform_device           the_hcd_pdev = {
1957         .name           = (char *) driver_name,
1958         .id             = -1,
1959         .dev            = {
1960                 .release        = dummy_hcd_release,
1961         },
1962 };
1963
1964 static int __init init (void)
1965 {
1966         int     retval;
1967
1968         if (usb_disabled ())
1969                 return -ENODEV;
1970
1971         retval = platform_driver_register (&dummy_hcd_driver);
1972         if (retval < 0)
1973                 return retval;
1974
1975         retval = platform_driver_register (&dummy_udc_driver);
1976         if (retval < 0)
1977                 goto err_register_udc_driver;
1978
1979         retval = platform_device_register (&the_hcd_pdev);
1980         if (retval < 0)
1981                 goto err_register_hcd;
1982
1983         retval = platform_device_register (&the_udc_pdev);
1984         if (retval < 0)
1985                 goto err_register_udc;
1986         return retval;
1987
1988 err_register_udc:
1989         platform_device_unregister (&the_hcd_pdev);
1990 err_register_hcd:
1991         platform_driver_unregister (&dummy_udc_driver);
1992 err_register_udc_driver:
1993         platform_driver_unregister (&dummy_hcd_driver);
1994         return retval;
1995 }
1996 module_init (init);
1997
1998 static void __exit cleanup (void)
1999 {
2000         platform_device_unregister (&the_udc_pdev);
2001         platform_device_unregister (&the_hcd_pdev);
2002         platform_driver_unregister (&dummy_udc_driver);
2003         platform_driver_unregister (&dummy_hcd_driver);
2004 }
2005 module_exit (cleanup);