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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 #define DEBUG
  38
  39 #include <linux/config.h>
  40 #include <linux/module.h>
  41 #include <linux/kernel.h>
  42 #include <linux/delay.h>
  43 #include <linux/ioport.h>
  44 #include <linux/sched.h>
  45 #include <linux/slab.h>
  46 #include <linux/smp_lock.h>
  47 #include <linux/errno.h>
  48 #include <linux/init.h>
  49 #include <linux/timer.h>
  50 #include <linux/list.h>
  51 #include <linux/interrupt.h>
  52 #include <linux/version.h>
  53
  54 #include <linux/usb.h>
  55 #include <linux/usb_gadget.h>
  56
  57 #include <asm/byteorder.h>
  58 #include <asm/io.h>
  59 #include <asm/irq.h>
  60 #include <asm/system.h>
  61 #include <asm/unaligned.h>
  62
  63
  64 #include "../core/hcd.h"
  65
  66
  67 #define DRIVER_DESC     "USB Host+Gadget Emulator"
  68 #define DRIVER_VERSION  "02 May 2005"
  69
  70 static const char       driver_name [] = "dummy_hcd";
  71 static const char       driver_desc [] = "USB Host+Gadget Emulator";
  72
  73 static const char       gadget_name [] = "dummy_udc";
  74
  75 MODULE_DESCRIPTION (DRIVER_DESC);
  76 MODULE_AUTHOR ("David Brownell");
  77 MODULE_LICENSE ("GPL");
  78
  79 /*-------------------------------------------------------------------------*/
  80
  81 /* gadget side driver data structres */
  82 struct dummy_ep {
  83         struct list_head                queue;
  84         unsigned long                   last_io;        /* jiffies timestamp */
  85         struct usb_gadget               *gadget;
  86         const struct usb_endpoint_descriptor *desc;
  87         struct usb_ep                   ep;
  88         unsigned                        halted : 1;
  89         unsigned                        already_seen : 1;
  90         unsigned                        setup_stage : 1;
  91 };
  92
  93 struct dummy_request {
  94         struct list_head                queue;          /* ep's requests */
  95         struct usb_request              req;
  96 };
  97
  98 static inline struct dummy_ep *usb_ep_to_dummy_ep (struct usb_ep *_ep)
  99 {
 100         return container_of (_ep, struct dummy_ep, ep);
 101 }
 102
 103 static inline struct dummy_request *usb_request_to_dummy_request
 104                 (struct usb_request *_req)
 105 {
 106         return container_of (_req, struct dummy_request, req);
 107 }
 108
 109 /*-------------------------------------------------------------------------*/
 110
 111 /*
 112  * Every device has ep0 for control requests, plus up to 30 more endpoints,
 113  * in one of two types:
 114  *
 115  *   - Configurable:  direction (in/out), type (bulk, iso, etc), and endpoint
 116  *     number can be changed.  Names like "ep-a" are used for this type.
 117  *
 118  *   - Fixed Function:  in other cases.  some characteristics may be mutable;
 119  *     that'd be hardware-specific.  Names like "ep12out-bulk" are used.
 120  *
 121  * Gadget drivers are responsible for not setting up conflicting endpoint
 122  * configurations, illegal or unsupported packet lengths, and so on.
 123  */
 124
 125 static const char ep0name [] = "ep0";
 126
 127 static const char *const ep_name [] = {
 128         ep0name,                                /* everyone has ep0 */
 129
 130         /* act like a net2280: high speed, six configurable endpoints */
 131         "ep-a", "ep-b", "ep-c", "ep-d", "ep-e", "ep-f",
 132
 133         /* or like pxa250: fifteen fixed function endpoints */
 134         "ep1in-bulk", "ep2out-bulk", "ep3in-iso", "ep4out-iso", "ep5in-int",
 135         "ep6in-bulk", "ep7out-bulk", "ep8in-iso", "ep9out-iso", "ep10in-int",
 136         "ep11in-bulk", "ep12out-bulk", "ep13in-iso", "ep14out-iso",
 137                 "ep15in-int",
 138
 139         /* or like sa1100: two fixed function endpoints */
 140         "ep1out-bulk", "ep2in-bulk",
 141 };
 142 #define DUMMY_ENDPOINTS (sizeof(ep_name)/sizeof(char *))
 143
 144 /*-------------------------------------------------------------------------*/
 145
 146 #define FIFO_SIZE               64
 147
 148 struct urbp {
 149         struct urb              *urb;
 150         struct list_head        urbp_list;
 151 };
 152
 153
 154 enum dummy_rh_state {
 155         DUMMY_RH_RESET,
 156         DUMMY_RH_SUSPENDED,
 157         DUMMY_RH_RUNNING
 158 };
 159
 160 struct dummy {
 161         spinlock_t                      lock;
 162
 163         /*
 164          * SLAVE/GADGET side support
 165          */
 166         struct dummy_ep                 ep [DUMMY_ENDPOINTS];
 167         int                             address;
 168         struct usb_gadget               gadget;
 169         struct usb_gadget_driver        *driver;
 170         struct dummy_request            fifo_req;
 171         u8                              fifo_buf [FIFO_SIZE];
 172         u16                             devstatus;
 173         unsigned                        udc_suspended:1;
 174         unsigned                        pullup:1;
 175         unsigned                        active:1;
 176         unsigned                        old_active:1;
 177
 178         /*
 179          * MASTER/HOST side support
 180          */
 181         enum dummy_rh_state             rh_state;
 182         struct timer_list               timer;
 183         u32                             port_status;
 184         u32                             old_status;
 185         unsigned                        resuming:1;
 186         unsigned long                   re_timeout;
 187
 188         struct usb_device               *udev;
 189         struct list_head                urbp_list;
 190 };
 191
 192 static inline struct dummy *hcd_to_dummy (struct usb_hcd *hcd)
 193 {
 194         return (struct dummy *) (hcd->hcd_priv);
 195 }
 196
 197 static inline struct usb_hcd *dummy_to_hcd (struct dummy *dum)
 198 {
 199         return container_of((void *) dum, struct usb_hcd, hcd_priv);
 200 }
 201
 202 static inline struct device *dummy_dev (struct dummy *dum)
 203 {
 204         return dummy_to_hcd(dum)->self.controller;
 205 }
 206
 207 static inline struct device *udc_dev (struct dummy *dum)
 208 {
 209         return dum->gadget.dev.parent;
 210 }
 211
 212 static inline struct dummy *ep_to_dummy (struct dummy_ep *ep)
 213 {
 214         return container_of (ep->gadget, struct dummy, gadget);
 215 }
 216
 217 static inline struct dummy *gadget_to_dummy (struct usb_gadget *gadget)
 218 {
 219         return container_of (gadget, struct dummy, gadget);
 220 }
 221
 222 static inline struct dummy *gadget_dev_to_dummy (struct device *dev)
 223 {
 224         return container_of (dev, struct dummy, gadget.dev);
 225 }
 226
 227 static struct dummy                     *the_controller;
 228
 229 /*-------------------------------------------------------------------------*/
 230
 231 /* SLAVE/GADGET SIDE UTILITY ROUTINES */
 232
 233 /* called with spinlock held */
 234 static void nuke (struct dummy *dum, struct dummy_ep *ep)
 235 {
 236         while (!list_empty (&ep->queue)) {
 237                 struct dummy_request    *req;
 238
 239                 req = list_entry (ep->queue.next, struct dummy_request, queue);
 240                 list_del_init (&req->queue);
 241                 req->req.status = -ESHUTDOWN;
 242
 243                 spin_unlock (&dum->lock);
 244                 req->req.complete (&ep->ep, &req->req);
 245                 spin_lock (&dum->lock);
 246         }
 247 }
 248
 249 /* caller must hold lock */
 250 static void
 251 stop_activity (struct dummy *dum)
 252 {
 253         struct dummy_ep *ep;
 254
 255         /* prevent any more requests */
 256         dum->address = 0;
 257
 258         /* The timer is left running so that outstanding URBs can fail */
 259
 260         /* nuke any pending requests first, so driver i/o is quiesced */
 261         list_for_each_entry (ep, &dum->gadget.ep_list, ep.ep_list)
 262                 nuke (dum, ep);
 263
 264         /* driver now does any non-usb quiescing necessary */
 265 }
 266
 267 /* caller must hold lock */
 268 static void
 269 set_link_state (struct dummy *dum)
 270 {
 271         dum->active = 0;
 272         if ((dum->port_status & USB_PORT_STAT_POWER) == 0)
 273                 dum->port_status = 0;
 274
 275         /* UDC suspend must cause a disconnect */
 276         else if (!dum->pullup || dum->udc_suspended) {
 277                 dum->port_status &= ~(USB_PORT_STAT_CONNECTION |
 278                                         USB_PORT_STAT_ENABLE |
 279                                         USB_PORT_STAT_LOW_SPEED |
 280                                         USB_PORT_STAT_HIGH_SPEED |
 281                                         USB_PORT_STAT_SUSPEND);
 282                 if ((dum->old_status & USB_PORT_STAT_CONNECTION) != 0)
 283                         dum->port_status |= (USB_PORT_STAT_C_CONNECTION << 16);
 284         } else {
 285                 dum->port_status |= USB_PORT_STAT_CONNECTION;
 286                 if ((dum->old_status & USB_PORT_STAT_CONNECTION) == 0)
 287                         dum->port_status |= (USB_PORT_STAT_C_CONNECTION << 16);
 288                 if ((dum->port_status & USB_PORT_STAT_ENABLE) == 0)
 289                         dum->port_status &= ~USB_PORT_STAT_SUSPEND;
 290                 else if ((dum->port_status & USB_PORT_STAT_SUSPEND) == 0 &&
 291                                 dum->rh_state != DUMMY_RH_SUSPENDED)
 292                         dum->active = 1;
 293         }
 294
 295         if ((dum->port_status & USB_PORT_STAT_ENABLE) == 0 || dum->active)
 296                 dum->resuming = 0;
 297
 298         if ((dum->port_status & USB_PORT_STAT_CONNECTION) == 0 ||
 299                         (dum->port_status & USB_PORT_STAT_RESET) != 0) {
 300                 if ((dum->old_status & USB_PORT_STAT_CONNECTION) != 0 &&
 301                                 (dum->old_status & USB_PORT_STAT_RESET) == 0 &&
 302                                 dum->driver) {
 303                         stop_activity (dum);
 304                         spin_unlock (&dum->lock);
 305                         dum->driver->disconnect (&dum->gadget);
 306                         spin_lock (&dum->lock);
 307                 }
 308         } else if (dum->active != dum->old_active) {
 309                 if (dum->old_active && dum->driver->suspend) {
 310                         spin_unlock (&dum->lock);
 311                         dum->driver->suspend (&dum->gadget);
 312                         spin_lock (&dum->lock);
 313                 } else if (!dum->old_active && dum->driver->resume) {
 314                         spin_unlock (&dum->lock);
 315                         dum->driver->resume (&dum->gadget);
 316                         spin_lock (&dum->lock);
 317                 }
 318         }
 319
 320         dum->old_status = dum->port_status;
 321         dum->old_active = dum->active;
 322 }
 323
 324 /*-------------------------------------------------------------------------*/
 325
 326 /* SLAVE/GADGET SIDE DRIVER
 327  *
 328  * This only tracks gadget state.  All the work is done when the host
 329  * side tries some (emulated) i/o operation.  Real device controller
 330  * drivers would do real i/o using dma, fifos, irqs, timers, etc.
 331  */
 332
 333 #define is_enabled(dum) \
 334         (dum->port_status & USB_PORT_STAT_ENABLE)
 335
 336 static int
 337 dummy_enable (struct usb_ep *_ep, const struct usb_endpoint_descriptor *desc)
 338 {
 339         struct dummy            *dum;
 340         struct dummy_ep         *ep;
 341         unsigned                max;
 342         int                     retval;
 343
 344         ep = usb_ep_to_dummy_ep (_ep);
 345         if (!_ep || !desc || ep->desc || _ep->name == ep0name
 346                         || desc->bDescriptorType != USB_DT_ENDPOINT)
 347                 return -EINVAL;
 348         dum = ep_to_dummy (ep);
 349         if (!dum->driver || !is_enabled (dum))
 350                 return -ESHUTDOWN;
 351         max = le16_to_cpu(desc->wMaxPacketSize) & 0x3ff;
 352
 353         /* drivers must not request bad settings, since lower levels
 354          * (hardware or its drivers) may not check.  some endpoints
 355          * can't do iso, many have maxpacket limitations, etc.
 356          *
 357          * since this "hardware" driver is here to help debugging, we
 358          * have some extra sanity checks.  (there could be more though,
 359          * especially for "ep9out" style fixed function ones.)
 360          */
 361         retval = -EINVAL;
 362         switch (desc->bmAttributes & 0x03) {
 363         case USB_ENDPOINT_XFER_BULK:
 364                 if (strstr (ep->ep.name, "-iso")
 365                                 || strstr (ep->ep.name, "-int")) {
 366                         goto done;
 367                 }
 368                 switch (dum->gadget.speed) {
 369                 case USB_SPEED_HIGH:
 370                         if (max == 512)
 371                                 break;
 372                         /* conserve return statements */
 373                 default:
 374                         switch (max) {
 375                         case 8: case 16: case 32: case 64:
 376                                 /* we'll fake any legal size */
 377                                 break;
 378                         default:
 379                 case USB_SPEED_LOW:
 380                                 goto done;
 381                         }
 382                 }
 383                 break;
 384         case USB_ENDPOINT_XFER_INT:
 385                 if (strstr (ep->ep.name, "-iso")) /* bulk is ok */
 386                         goto done;
 387                 /* real hardware might not handle all packet sizes */
 388                 switch (dum->gadget.speed) {
 389                 case USB_SPEED_HIGH:
 390                         if (max <= 1024)
 391                                 break;
 392                         /* save a return statement */
 393                 case USB_SPEED_FULL:
 394                         if (max <= 64)
 395                                 break;
 396                         /* save a return statement */
 397                 default:
 398                         if (max <= 8)
 399                                 break;
 400                         goto done;
 401                 }
 402                 break;
 403         case USB_ENDPOINT_XFER_ISOC:
 404                 if (strstr (ep->ep.name, "-bulk")
 405                                 || strstr (ep->ep.name, "-int"))
 406                         goto done;
 407                 /* real hardware might not handle all packet sizes */
 408                 switch (dum->gadget.speed) {
 409                 case USB_SPEED_HIGH:
 410                         if (max <= 1024)
 411                                 break;
 412                         /* save a return statement */
 413                 case USB_SPEED_FULL:
 414                         if (max <= 1023)
 415                                 break;
 416                         /* save a return statement */
 417                 default:
 418                         goto done;
 419                 }
 420                 break;
 421         default:
 422                 /* few chips support control except on ep0 */
 423                 goto done;
 424         }
 425
 426         _ep->maxpacket = max;
 427         ep->desc = desc;
 428
 429         dev_dbg (udc_dev(dum), "enabled %s (ep%d%s-%s) maxpacket %d\n",
 430                 _ep->name,
 431                 desc->bEndpointAddress & 0x0f,
 432                 (desc->bEndpointAddress & USB_DIR_IN) ? "in" : "out",
 433                 ({ char *val;
 434                  switch (desc->bmAttributes & 0x03) {
 435                  case USB_ENDPOINT_XFER_BULK: val = "bulk"; break;
 436                  case USB_ENDPOINT_XFER_ISOC: val = "iso"; break;
 437                  case USB_ENDPOINT_XFER_INT: val = "intr"; break;
 438                  default: val = "ctrl"; break;
 439                  }; val; }),
 440                 max);
 441
 442         /* at this point real hardware should be NAKing transfers
 443          * to that endpoint, until a buffer is queued to it.
 444          */
 445         retval = 0;
 446 done:
 447         return retval;
 448 }
 449
 450 static int dummy_disable (struct usb_ep *_ep)
 451 {
 452         struct dummy_ep         *ep;
 453         struct dummy            *dum;
 454         unsigned long           flags;
 455         int                     retval;
 456
 457         ep = usb_ep_to_dummy_ep (_ep);
 458         if (!_ep || !ep->desc || _ep->name == ep0name)
 459                 return -EINVAL;
 460         dum = ep_to_dummy (ep);
 461
 462         spin_lock_irqsave (&dum->lock, flags);
 463         ep->desc = NULL;
 464         retval = 0;
 465         nuke (dum, ep);
 466         spin_unlock_irqrestore (&dum->lock, flags);
 467
 468         dev_dbg (udc_dev(dum), "disabled %s\n", _ep->name);
 469         return retval;
 470 }
 471
 472 static struct usb_request *
 473 dummy_alloc_request (struct usb_ep *_ep, int mem_flags)
 474 {
 475         struct dummy_ep         *ep;
 476         struct dummy_request    *req;
 477
 478         if (!_ep)
 479                 return NULL;
 480         ep = usb_ep_to_dummy_ep (_ep);
 481
 482         req = kmalloc (sizeof *req, mem_flags);
 483         if (!req)
 484                 return NULL;
 485         memset (req, 0, sizeof *req);
 486         INIT_LIST_HEAD (&req->queue);
 487         return &req->req;
 488 }
 489
 490 static void
 491 dummy_free_request (struct usb_ep *_ep, struct usb_request *_req)
 492 {
 493         struct dummy_ep         *ep;
 494         struct dummy_request    *req;
 495
 496         ep = usb_ep_to_dummy_ep (_ep);
 497         if (!ep || !_req || (!ep->desc && _ep->name != ep0name))
 498                 return;
 499
 500         req = usb_request_to_dummy_request (_req);
 501         WARN_ON (!list_empty (&req->queue));
 502         kfree (req);
 503 }
 504
 505 static void *
 506 dummy_alloc_buffer (
 507         struct usb_ep *_ep,
 508         unsigned bytes,
 509         dma_addr_t *dma,
 510         int mem_flags
 511 ) {
 512         char                    *retval;
 513         struct dummy_ep         *ep;
 514         struct dummy            *dum;
 515
 516         ep = usb_ep_to_dummy_ep (_ep);
 517         dum = ep_to_dummy (ep);
 518
 519         if (!dum->driver)
 520                 return NULL;
 521         retval = kmalloc (bytes, mem_flags);
 522         *dma = (dma_addr_t) retval;
 523         return retval;
 524 }
 525
 526 static void
 527 dummy_free_buffer (
 528         struct usb_ep *_ep,
 529         void *buf,
 530         dma_addr_t dma,
 531         unsigned bytes
 532 ) {
 533         if (bytes)
 534                 kfree (buf);
 535 }
 536
 537 static void
 538 fifo_complete (struct usb_ep *ep, struct usb_request *req)
 539 {
 540 }
 541
 542 static int
 543 dummy_queue (struct usb_ep *_ep, struct usb_request *_req, int mem_flags)
 544 {
 545         struct dummy_ep         *ep;
 546         struct dummy_request    *req;
 547         struct dummy            *dum;
 548         unsigned long           flags;
 549
 550         req = usb_request_to_dummy_request (_req);
 551         if (!_req || !list_empty (&req->queue) || !_req->complete)
 552                 return -EINVAL;
 553
 554         ep = usb_ep_to_dummy_ep (_ep);
 555         if (!_ep || (!ep->desc && _ep->name != ep0name))
 556                 return -EINVAL;
 557
 558         dum = ep_to_dummy (ep);
 559         if (!dum->driver || !is_enabled (dum))
 560                 return -ESHUTDOWN;
 561
 562 #if 0
 563         dev_dbg (udc_dev(dum), "ep %p queue req %p to %s, len %d buf %p\n",
 564                         ep, _req, _ep->name, _req->length, _req->buf);
 565 #endif
 566
 567         _req->status = -EINPROGRESS;
 568         _req->actual = 0;
 569         spin_lock_irqsave (&dum->lock, flags);
 570
 571         /* implement an emulated single-request FIFO */
 572         if (ep->desc && (ep->desc->bEndpointAddress & USB_DIR_IN) &&
 573                         list_empty (&dum->fifo_req.queue) &&
 574                         list_empty (&ep->queue) &&
 575                         _req->length <= FIFO_SIZE) {
 576                 req = &dum->fifo_req;
 577                 req->req = *_req;
 578                 req->req.buf = dum->fifo_buf;
 579                 memcpy (dum->fifo_buf, _req->buf, _req->length);
 580                 req->req.context = dum;
 581                 req->req.complete = fifo_complete;
 582
 583                 spin_unlock (&dum->lock);
 584                 _req->actual = _req->length;
 585                 _req->status = 0;
 586                 _req->complete (_ep, _req);
 587                 spin_lock (&dum->lock);
 588         }
 589         list_add_tail (&req->queue, &ep->queue);
 590         spin_unlock_irqrestore (&dum->lock, flags);
 591
 592         /* real hardware would likely enable transfers here, in case
 593          * it'd been left NAKing.
 594          */
 595         return 0;
 596 }
 597
 598 static int dummy_dequeue (struct usb_ep *_ep, struct usb_request *_req)
 599 {
 600         struct dummy_ep         *ep;
 601         struct dummy            *dum;
 602         int                     retval = -EINVAL;
 603         unsigned long           flags;
 604         struct dummy_request    *req = NULL;
 605
 606         if (!_ep || !_req)
 607                 return retval;
 608         ep = usb_ep_to_dummy_ep (_ep);
 609         dum = ep_to_dummy (ep);
 610
 611         if (!dum->driver)
 612                 return -ESHUTDOWN;
 613
 614         spin_lock_irqsave (&dum->lock, flags);
 615         list_for_each_entry (req, &ep->queue, queue) {
 616                 if (&req->req == _req) {
 617                         list_del_init (&req->queue);
 618                         _req->status = -ECONNRESET;
 619                         retval = 0;
 620                         break;
 621                 }
 622         }
 623         spin_unlock_irqrestore (&dum->lock, flags);
 624
 625         if (retval == 0) {
 626                 dev_dbg (udc_dev(dum),
 627                                 "dequeued req %p from %s, len %d buf %p\n",
 628                                 req, _ep->name, _req->length, _req->buf);
 629                 _req->complete (_ep, _req);
 630         }
 631         return retval;
 632 }
 633
 634 static int
 635 dummy_set_halt (struct usb_ep *_ep, int value)
 636 {
 637         struct dummy_ep         *ep;
 638         struct dummy            *dum;
 639
 640         if (!_ep)
 641                 return -EINVAL;
 642         ep = usb_ep_to_dummy_ep (_ep);
 643         dum = ep_to_dummy (ep);
 644         if (!dum->driver)
 645                 return -ESHUTDOWN;
 646         if (!value)
 647                 ep->halted = 0;
 648         else if (ep->desc && (ep->desc->bEndpointAddress & USB_DIR_IN) &&
 649                         !list_empty (&ep->queue))
 650                 return -EAGAIN;
 651         else
 652                 ep->halted = 1;
 653         /* FIXME clear emulated data toggle too */
 654         return 0;
 655 }
 656
 657 static const struct usb_ep_ops dummy_ep_ops = {
 658         .enable         = dummy_enable,
 659         .disable        = dummy_disable,
 660
 661         .alloc_request  = dummy_alloc_request,
 662         .free_request   = dummy_free_request,
 663
 664         .alloc_buffer   = dummy_alloc_buffer,
 665         .free_buffer    = dummy_free_buffer,
 666         /* map, unmap, ... eventually hook the "generic" dma calls */
 667
 668         .queue          = dummy_queue,
 669         .dequeue        = dummy_dequeue,
 670
 671         .set_halt       = dummy_set_halt,
 672 };
 673
 674 /*-------------------------------------------------------------------------*/
 675
 676 /* there are both host and device side versions of this call ... */
 677 static int dummy_g_get_frame (struct usb_gadget *_gadget)
 678 {
 679         struct timeval  tv;
 680
 681         do_gettimeofday (&tv);
 682         return tv.tv_usec / 1000;
 683 }
 684
 685 static int dummy_wakeup (struct usb_gadget *_gadget)
 686 {
 687         struct dummy    *dum;
 688
 689         dum = gadget_to_dummy (_gadget);
 690         if (!(dum->devstatus &  ( (1 << USB_DEVICE_B_HNP_ENABLE)
 691                                 | (1 << USB_DEVICE_REMOTE_WAKEUP))))
 692                 return -EINVAL;
 693         if ((dum->port_status & USB_PORT_STAT_CONNECTION) == 0)
 694                 return -ENOLINK;
 695         if ((dum->port_status & USB_PORT_STAT_SUSPEND) == 0 &&
 696                          dum->rh_state != DUMMY_RH_SUSPENDED)
 697                 return -EIO;
 698
 699         /* FIXME: What if the root hub is suspended but the port isn't? */
 700
 701         /* hub notices our request, issues downstream resume, etc */
 702         dum->resuming = 1;
 703         dum->re_timeout = jiffies + msecs_to_jiffies(20);
 704         mod_timer (&dummy_to_hcd (dum)->rh_timer, dum->re_timeout);
 705         return 0;
 706 }
 707
 708 static int dummy_set_selfpowered (struct usb_gadget *_gadget, int value)
 709 {
 710         struct dummy    *dum;
 711
 712         dum = gadget_to_dummy (_gadget);
 713         if (value)
 714                 dum->devstatus |= (1 << USB_DEVICE_SELF_POWERED);
 715         else
 716                 dum->devstatus &= ~(1 << USB_DEVICE_SELF_POWERED);
 717         return 0;
 718 }
 719
 720 static int dummy_pullup (struct usb_gadget *_gadget, int value)
 721 {
 722         struct dummy    *dum;
 723         unsigned long   flags;
 724
 725         dum = gadget_to_dummy (_gadget);
 726         spin_lock_irqsave (&dum->lock, flags);
 727         dum->pullup = (value != 0);
 728         set_link_state (dum);
 729         spin_unlock_irqrestore (&dum->lock, flags);
 730
 731         usb_hcd_poll_rh_status (dummy_to_hcd (dum));
 732         return 0;
 733 }
 734
 735 static const struct usb_gadget_ops dummy_ops = {
 736         .get_frame      = dummy_g_get_frame,
 737         .wakeup         = dummy_wakeup,
 738         .set_selfpowered = dummy_set_selfpowered,
 739         .pullup         = dummy_pullup,
 740 };
 741
 742 /*-------------------------------------------------------------------------*/
 743
 744 /* "function" sysfs attribute */
 745 static ssize_t
 746 show_function (struct device *dev, struct device_attribute *attr, char *buf)
 747 {
 748         struct dummy    *dum = gadget_dev_to_dummy (dev);
 749
 750         if (!dum->driver || !dum->driver->function)
 751                 return 0;
 752         return scnprintf (buf, PAGE_SIZE, "%s\n", dum->driver->function);
 753 }
 754 static DEVICE_ATTR (function, S_IRUGO, show_function, NULL);
 755
 756 /*-------------------------------------------------------------------------*/
 757
 758 /*
 759  * Driver registration/unregistration.
 760  *
 761  * This is basically hardware-specific; there's usually only one real USB
 762  * device (not host) controller since that's how USB devices are intended
 763  * to work.  So most implementations of these api calls will rely on the
 764  * fact that only one driver will ever bind to the hardware.  But curious
 765  * hardware can be built with discrete components, so the gadget API doesn't
 766  * require that assumption.
 767  *
 768  * For this emulator, it might be convenient to create a usb slave device
 769  * for each driver that registers:  just add to a big root hub.
 770  */
 771
 772 int
 773 usb_gadget_register_driver (struct usb_gadget_driver *driver)
 774 {
 775         struct dummy    *dum = the_controller;
 776         int             retval, i;
 777
 778         if (!dum)
 779                 return -EINVAL;
 780         if (dum->driver)
 781                 return -EBUSY;
 782         if (!driver->bind || !driver->unbind || !driver->setup
 783                         || driver->speed == USB_SPEED_UNKNOWN)
 784                 return -EINVAL;
 785
 786         /*
 787          * SLAVE side init ... the layer above hardware, which
 788          * can't enumerate without help from the driver we're binding.
 789          */
 790
 791         dum->devstatus = 0;
 792
 793         INIT_LIST_HEAD (&dum->gadget.ep_list);
 794         for (i = 0; i < DUMMY_ENDPOINTS; i++) {
 795                 struct dummy_ep *ep = &dum->ep [i];
 796
 797                 if (!ep_name [i])
 798                         break;
 799                 ep->ep.name = ep_name [i];
 800                 ep->ep.ops = &dummy_ep_ops;
 801                 list_add_tail (&ep->ep.ep_list, &dum->gadget.ep_list);
 802                 ep->halted = ep->already_seen = ep->setup_stage = 0;
 803                 ep->ep.maxpacket = ~0;
 804                 ep->last_io = jiffies;
 805                 ep->gadget = &dum->gadget;
 806                 ep->desc = NULL;
 807                 INIT_LIST_HEAD (&ep->queue);
 808         }
 809
 810         dum->gadget.ep0 = &dum->ep [0].ep;
 811         dum->ep [0].ep.maxpacket = 64;
 812         list_del_init (&dum->ep [0].ep.ep_list);
 813         INIT_LIST_HEAD(&dum->fifo_req.queue);
 814
 815         dum->driver = driver;
 816         dum->gadget.dev.driver = &driver->driver;
 817         dev_dbg (udc_dev(dum), "binding gadget driver '%s'\n",
 818                         driver->driver.name);
 819         if ((retval = driver->bind (&dum->gadget)) != 0) {
 820                 dum->driver = NULL;
 821                 dum->gadget.dev.driver = NULL;
 822                 return retval;
 823         }
 824
 825         driver->driver.bus = dum->gadget.dev.parent->bus;
 826         driver_register (&driver->driver);
 827         device_bind_driver (&dum->gadget.dev);
 828
 829         /* khubd will enumerate this in a while */
 830         spin_lock_irq (&dum->lock);
 831         dum->pullup = 1;
 832         set_link_state (dum);
 833         spin_unlock_irq (&dum->lock);
 834
 835         usb_hcd_poll_rh_status (dummy_to_hcd (dum));
 836         return 0;
 837 }
 838 EXPORT_SYMBOL (usb_gadget_register_driver);
 839
 840 int
 841 usb_gadget_unregister_driver (struct usb_gadget_driver *driver)
 842 {
 843         struct dummy    *dum = the_controller;
 844         unsigned long   flags;
 845
 846         if (!dum)
 847                 return -ENODEV;
 848         if (!driver || driver != dum->driver)
 849                 return -EINVAL;
 850
 851         dev_dbg (udc_dev(dum), "unregister gadget driver '%s'\n",
 852                         driver->driver.name);
 853
 854         spin_lock_irqsave (&dum->lock, flags);
 855         dum->pullup = 0;
 856         set_link_state (dum);
 857         spin_unlock_irqrestore (&dum->lock, flags);
 858
 859         driver->unbind (&dum->gadget);
 860         dum->driver = NULL;
 861
 862         device_release_driver (&dum->gadget.dev);
 863         driver_unregister (&driver->driver);
 864
 865         spin_lock_irqsave (&dum->lock, flags);
 866         dum->pullup = 0;
 867         set_link_state (dum);
 868         spin_unlock_irqrestore (&dum->lock, flags);
 869
 870         usb_hcd_poll_rh_status (dummy_to_hcd (dum));
 871         return 0;
 872 }
 873 EXPORT_SYMBOL (usb_gadget_unregister_driver);
 874
 875 #undef is_enabled
 876
 877 /* just declare this in any driver that really need it */
 878 extern int net2280_set_fifo_mode (struct usb_gadget *gadget, int mode);
 879
 880 int net2280_set_fifo_mode (struct usb_gadget *gadget, int mode)
 881 {
 882         return -ENOSYS;
 883 }
 884 EXPORT_SYMBOL (net2280_set_fifo_mode);
 885
 886
 887 /* The gadget structure is stored inside the hcd structure and will be
 888  * released along with it. */
 889 static void
 890 dummy_gadget_release (struct device *dev)
 891 {
 892 #if 0           /* usb_bus_put isn't EXPORTed! */
 893         struct dummy    *dum = gadget_dev_to_dummy (dev);
 894
 895         usb_bus_put (&dummy_to_hcd (dum)->self);
 896 #endif
 897 }
 898
 899 static int dummy_udc_probe (struct device *dev)
 900 {
 901         struct dummy    *dum = the_controller;
 902         int             rc;
 903
 904         dum->gadget.name = gadget_name;
 905         dum->gadget.ops = &dummy_ops;
 906         dum->gadget.is_dualspeed = 1;
 907
 908         /* maybe claim OTG support, though we won't complete HNP */
 909         dum->gadget.is_otg = (dummy_to_hcd(dum)->self.otg_port != 0);
 910
 911         strcpy (dum->gadget.dev.bus_id, "gadget");
 912         dum->gadget.dev.parent = dev;
 913         dum->gadget.dev.release = dummy_gadget_release;
 914         rc = device_register (&dum->gadget.dev);
 915         if (rc < 0)
 916                 return rc;
 917
 918 #if 0           /* usb_bus_get isn't EXPORTed! */
 919         usb_bus_get (&dummy_to_hcd (dum)->self);
 920 #endif
 921
 922         dev_set_drvdata (dev, dum);
 923         device_create_file (&dum->gadget.dev, &dev_attr_function);
 924         return rc;
 925 }
 926
 927 static int dummy_udc_remove (struct device *dev)
 928 {
 929         struct dummy    *dum = dev_get_drvdata (dev);
 930
 931         dev_set_drvdata (dev, NULL);
 932         device_remove_file (&dum->gadget.dev, &dev_attr_function);
 933         device_unregister (&dum->gadget.dev);
 934         return 0;
 935 }
 936
 937 static int dummy_udc_suspend (struct device *dev, pm_message_t state,
 938                 u32 level)
 939 {
 940         struct dummy    *dum = dev_get_drvdata(dev);
 941
 942         if (level != SUSPEND_DISABLE)
 943                 return 0;
 944
 945         dev_dbg (dev, "%s\n", __FUNCTION__);
 946         spin_lock_irq (&dum->lock);
 947         dum->udc_suspended = 1;
 948         set_link_state (dum);
 949         spin_unlock_irq (&dum->lock);
 950
 951         dev->power.power_state = state;
 952         usb_hcd_poll_rh_status (dummy_to_hcd (dum));
 953         return 0;
 954 }
 955
 956 static int dummy_udc_resume (struct device *dev, u32 level)
 957 {
 958         struct dummy    *dum = dev_get_drvdata(dev);
 959
 960         if (level != RESUME_ENABLE)
 961                 return 0;
 962
 963         dev_dbg (dev, "%s\n", __FUNCTION__);
 964         spin_lock_irq (&dum->lock);
 965         dum->udc_suspended = 0;
 966         set_link_state (dum);
 967         spin_unlock_irq (&dum->lock);
 968
 969         dev->power.power_state = PMSG_ON;
 970         usb_hcd_poll_rh_status (dummy_to_hcd (dum));
 971         return 0;
 972 }
 973
 974 static struct device_driver dummy_udc_driver = {
 975         .name           = (char *) gadget_name,
 976         .bus            = &platform_bus_type,
 977         .probe          = dummy_udc_probe,
 978         .remove         = dummy_udc_remove,
 979         .suspend        = dummy_udc_suspend,
 980         .resume         = dummy_udc_resume,
 981 };
 982
 983 /*-------------------------------------------------------------------------*/
 984
 985 /* MASTER/HOST SIDE DRIVER
 986  *
 987  * this uses the hcd framework to hook up to host side drivers.
 988  * its root hub will only have one device, otherwise it acts like
 989  * a normal host controller.
 990  *
 991  * when urbs are queued, they're just stuck on a list that we
 992  * scan in a timer callback.  that callback connects writes from
 993  * the host with reads from the device, and so on, based on the
 994  * usb 2.0 rules.
 995  */
 996
 997 static int dummy_urb_enqueue (
 998         struct usb_hcd                  *hcd,
 999         struct usb_host_endpoint        *ep,
1000         struct urb                      *urb,
1001         int                             mem_flags
1002 ) {
1003         struct dummy    *dum;
1004         struct urbp     *urbp;
1005         unsigned long   flags;
1006
1007         if (!urb->transfer_buffer && urb->transfer_buffer_length)
1008                 return -EINVAL;
1009
1010         urbp = kmalloc (sizeof *urbp, mem_flags);
1011         if (!urbp)
1012                 return -ENOMEM;
1013         urbp->urb = urb;
1014
1015         dum = hcd_to_dummy (hcd);
1016         spin_lock_irqsave (&dum->lock, flags);
1017
1018         if (!dum->udev) {
1019                 dum->udev = urb->dev;
1020                 usb_get_dev (dum->udev);
1021         } else if (unlikely (dum->udev != urb->dev))
1022                 dev_err (dummy_dev(dum), "usb_device address has changed!\n");
1023
1024         list_add_tail (&urbp->urbp_list, &dum->urbp_list);
1025         urb->hcpriv = urbp;
1026         if (usb_pipetype (urb->pipe) == PIPE_CONTROL)
1027                 urb->error_count = 1;           /* mark as a new urb */
1028
1029         /* kick the scheduler, it'll do the rest */
1030         if (!timer_pending (&dum->timer))
1031                 mod_timer (&dum->timer, jiffies + 1);
1032
1033         spin_unlock_irqrestore (&dum->lock, flags);
1034         return 0;
1035 }
1036
1037 static int dummy_urb_dequeue (struct usb_hcd *hcd, struct urb *urb)
1038 {
1039         struct dummy    *dum;
1040         unsigned long   flags;
1041
1042         /* giveback happens automatically in timer callback,
1043          * so make sure the callback happens */
1044         dum = hcd_to_dummy (hcd);
1045         spin_lock_irqsave (&dum->lock, flags);
1046         if (dum->rh_state != DUMMY_RH_RUNNING && !list_empty(&dum->urbp_list))
1047                 mod_timer (&dum->timer, jiffies);
1048         spin_unlock_irqrestore (&dum->lock, flags);
1049         return 0;
1050 }
1051
1052 static void maybe_set_status (struct urb *urb, int status)
1053 {
1054         spin_lock (&urb->lock);
1055         if (urb->status == -EINPROGRESS)
1056                 urb->status = status;
1057         spin_unlock (&urb->lock);
1058 }
1059
1060 /* transfer up to a frame's worth; caller must own lock */
1061 static int
1062 transfer (struct dummy *dum, struct urb *urb, struct dummy_ep *ep, int limit)
1063 {
1064         struct dummy_request    *req;
1065
1066 top:
1067         /* if there's no request queued, the device is NAKing; return */
1068         list_for_each_entry (req, &ep->queue, queue) {
1069                 unsigned        host_len, dev_len, len;
1070                 int             is_short, to_host;
1071                 int             rescan = 0;
1072
1073                 /* 1..N packets of ep->ep.maxpacket each ... the last one
1074                  * may be short (including zero length).
1075                  *
1076                  * writer can send a zlp explicitly (length 0) or implicitly
1077                  * (length mod maxpacket zero, and 'zero' flag); they always
1078                  * terminate reads.
1079                  */
1080                 host_len = urb->transfer_buffer_length - urb->actual_length;
1081                 dev_len = req->req.length - req->req.actual;
1082                 len = min (host_len, dev_len);
1083
1084                 /* FIXME update emulated data toggle too */
1085
1086                 to_host = usb_pipein (urb->pipe);
1087                 if (unlikely (len == 0))
1088                         is_short = 1;
1089                 else {
1090                         char            *ubuf, *rbuf;
1091
1092                         /* not enough bandwidth left? */
1093                         if (limit < ep->ep.maxpacket && limit < len)
1094                                 break;
1095                         len = min (len, (unsigned) limit);
1096                         if (len == 0)
1097                                 break;
1098
1099                         /* use an extra pass for the final short packet */
1100                         if (len > ep->ep.maxpacket) {
1101                                 rescan = 1;
1102                                 len -= (len % ep->ep.maxpacket);
1103                         }
1104                         is_short = (len % ep->ep.maxpacket) != 0;
1105
1106                         /* else transfer packet(s) */
1107                         ubuf = urb->transfer_buffer + urb->actual_length;
1108                         rbuf = req->req.buf + req->req.actual;
1109                         if (to_host)
1110                                 memcpy (ubuf, rbuf, len);
1111                         else
1112                                 memcpy (rbuf, ubuf, len);
1113                         ep->last_io = jiffies;
1114
1115                         limit -= len;
1116                         urb->actual_length += len;
1117                         req->req.actual += len;
1118                 }
1119
1120                 /* short packets terminate, maybe with overflow/underflow.
1121                  * it's only really an error to write too much.
1122                  *
1123                  * partially filling a buffer optionally blocks queue advances
1124                  * (so completion handlers can clean up the queue) but we don't
1125                  * need to emulate such data-in-flight.  so we only show part
1126                  * of the URB_SHORT_NOT_OK effect: completion status.
1127                  */
1128                 if (is_short) {
1129                         if (host_len == dev_len) {
1130                                 req->req.status = 0;
1131                                 maybe_set_status (urb, 0);
1132                         } else if (to_host) {
1133                                 req->req.status = 0;
1134                                 if (dev_len > host_len)
1135                                         maybe_set_status (urb, -EOVERFLOW);
1136                                 else
1137                                         maybe_set_status (urb,
1138                                                 (urb->transfer_flags
1139                                                         & URB_SHORT_NOT_OK)
1140                                                 ? -EREMOTEIO : 0);
1141                         } else if (!to_host) {
1142                                 maybe_set_status (urb, 0);
1143                                 if (host_len > dev_len)
1144                                         req->req.status = -EOVERFLOW;
1145                                 else
1146                                         req->req.status = 0;
1147                         }
1148
1149                 /* many requests terminate without a short packet */
1150                 } else {
1151                         if (req->req.length == req->req.actual
1152                                         && !req->req.zero)
1153                                 req->req.status = 0;
1154                         if (urb->transfer_buffer_length == urb->actual_length
1155                                         && !(urb->transfer_flags
1156                                                 & URB_ZERO_PACKET)) {
1157                                 maybe_set_status (urb, 0);
1158                         }
1159                 }
1160
1161                 /* device side completion --> continuable */
1162                 if (req->req.status != -EINPROGRESS) {
1163                         list_del_init (&req->queue);
1164
1165                         spin_unlock (&dum->lock);
1166                         req->req.complete (&ep->ep, &req->req);
1167                         spin_lock (&dum->lock);
1168
1169                         /* requests might have been unlinked... */
1170                         rescan = 1;
1171                 }
1172
1173                 /* host side completion --> terminate */
1174                 if (urb->status != -EINPROGRESS)
1175                         break;
1176
1177                 /* rescan to continue with any other queued i/o */
1178                 if (rescan)
1179                         goto top;
1180         }
1181         return limit;
1182 }
1183
1184 static int periodic_bytes (struct dummy *dum, struct dummy_ep *ep)
1185 {
1186         int     limit = ep->ep.maxpacket;
1187
1188         if (dum->gadget.speed == USB_SPEED_HIGH) {
1189                 int     tmp;
1190
1191                 /* high bandwidth mode */
1192                 tmp = le16_to_cpu(ep->desc->wMaxPacketSize);
1193                 tmp = (tmp >> 11) & 0x03;
1194                 tmp *= 8 /* applies to entire frame */;
1195                 limit += limit * tmp;
1196         }
1197         return limit;
1198 }
1199
1200 #define is_active(dum)  ((dum->port_status & \
1201                 (USB_PORT_STAT_CONNECTION | USB_PORT_STAT_ENABLE | \
1202                         USB_PORT_STAT_SUSPEND)) \
1203                 == (USB_PORT_STAT_CONNECTION | USB_PORT_STAT_ENABLE))
1204
1205 static struct dummy_ep *find_endpoint (struct dummy *dum, u8 address)
1206 {
1207         int             i;
1208
1209         if (!is_active (dum))
1210                 return NULL;
1211         if ((address & ~USB_DIR_IN) == 0)
1212                 return &dum->ep [0];
1213         for (i = 1; i < DUMMY_ENDPOINTS; i++) {
1214                 struct dummy_ep *ep = &dum->ep [i];
1215
1216                 if (!ep->desc)
1217                         continue;
1218                 if (ep->desc->bEndpointAddress == address)
1219                         return ep;
1220         }
1221         return NULL;
1222 }
1223
1224 #undef is_active
1225
1226 #define Dev_Request     (USB_TYPE_STANDARD | USB_RECIP_DEVICE)
1227 #define Dev_InRequest   (Dev_Request | USB_DIR_IN)
1228 #define Intf_Request    (USB_TYPE_STANDARD | USB_RECIP_INTERFACE)
1229 #define Intf_InRequest  (Intf_Request | USB_DIR_IN)
1230 #define Ep_Request      (USB_TYPE_STANDARD | USB_RECIP_ENDPOINT)
1231 #define Ep_InRequest    (Ep_Request | USB_DIR_IN)
1232
1233 /* drive both sides of the transfers; looks like irq handlers to
1234  * both drivers except the callbacks aren't in_irq().
1235  */
1236 static void dummy_timer (unsigned long _dum)
1237 {
1238         struct dummy            *dum = (struct dummy *) _dum;
1239         struct urbp             *urbp, *tmp;
1240         unsigned long           flags;
1241         int                     limit, total;
1242         int                     i;
1243
1244         /* simplistic model for one frame's bandwidth */
1245         switch (dum->gadget.speed) {
1246         case USB_SPEED_LOW:
1247                 total = 8/*bytes*/ * 12/*packets*/;
1248                 break;
1249         case USB_SPEED_FULL:
1250                 total = 64/*bytes*/ * 19/*packets*/;
1251                 break;
1252         case USB_SPEED_HIGH:
1253                 total = 512/*bytes*/ * 13/*packets*/ * 8/*uframes*/;
1254                 break;
1255         default:
1256                 dev_err (dummy_dev(dum), "bogus device speed\n");
1257                 return;
1258         }
1259
1260         /* FIXME if HZ != 1000 this will probably misbehave ... */
1261
1262         /* look at each urb queued by the host side driver */
1263         spin_lock_irqsave (&dum->lock, flags);
1264
1265         if (!dum->udev) {
1266                 dev_err (dummy_dev(dum),
1267                                 "timer fired with no URBs pending?\n");
1268                 spin_unlock_irqrestore (&dum->lock, flags);
1269                 return;
1270         }
1271
1272         for (i = 0; i < DUMMY_ENDPOINTS; i++) {
1273                 if (!ep_name [i])
1274                         break;
1275                 dum->ep [i].already_seen = 0;
1276         }
1277
1278 restart:
1279         list_for_each_entry_safe (urbp, tmp, &dum->urbp_list, urbp_list) {
1280                 struct urb              *urb;
1281                 struct dummy_request    *req;
1282                 u8                      address;
1283                 struct dummy_ep         *ep = NULL;
1284                 int                     type;
1285
1286                 urb = urbp->urb;
1287                 if (urb->status != -EINPROGRESS) {
1288                         /* likely it was just unlinked */
1289                         goto return_urb;
1290                 } else if (dum->rh_state != DUMMY_RH_RUNNING)
1291                         continue;
1292                 type = usb_pipetype (urb->pipe);
1293
1294                 /* used up this frame's non-periodic bandwidth?
1295                  * FIXME there's infinite bandwidth for control and
1296                  * periodic transfers ... unrealistic.
1297                  */
1298                 if (total <= 0 && type == PIPE_BULK)
1299                         continue;
1300
1301                 /* find the gadget's ep for this request (if configured) */
1302                 address = usb_pipeendpoint (urb->pipe);
1303                 if (usb_pipein (urb->pipe))
1304                         address |= USB_DIR_IN;
1305                 ep = find_endpoint(dum, address);
1306                 if (!ep) {
1307                         /* set_configuration() disagreement */
1308                         dev_dbg (dummy_dev(dum),
1309                                 "no ep configured for urb %p\n",
1310                                 urb);
1311                         maybe_set_status (urb, -EPROTO);
1312                         goto return_urb;
1313                 }
1314
1315                 if (ep->already_seen)
1316                         continue;
1317                 ep->already_seen = 1;
1318                 if (ep == &dum->ep [0] && urb->error_count) {
1319                         ep->setup_stage = 1;    /* a new urb */
1320                         urb->error_count = 0;
1321                 }
1322                 if (ep->halted && !ep->setup_stage) {
1323                         /* NOTE: must not be iso! */
1324                         dev_dbg (dummy_dev(dum), "ep %s halted, urb %p\n",
1325                                         ep->ep.name, urb);
1326                         maybe_set_status (urb, -EPIPE);
1327                         goto return_urb;
1328                 }
1329                 /* FIXME make sure both ends agree on maxpacket */
1330
1331                 /* handle control requests */
1332                 if (ep == &dum->ep [0] && ep->setup_stage) {
1333                         struct usb_ctrlrequest          setup;
1334                         int                             value = 1;
1335                         struct dummy_ep                 *ep2;
1336                         unsigned                        w_index;
1337                         unsigned                        w_value;
1338
1339                         setup = *(struct usb_ctrlrequest*) urb->setup_packet;
1340                         w_index = le16_to_cpu(setup.wIndex);
1341                         w_value = le16_to_cpu(setup.wValue);
1342                         if (le16_to_cpu(setup.wLength) !=
1343                                         urb->transfer_buffer_length) {
1344                                 maybe_set_status (urb, -EOVERFLOW);
1345                                 goto return_urb;
1346                         }
1347
1348                         /* paranoia, in case of stale queued data */
1349                         list_for_each_entry (req, &ep->queue, queue) {
1350                                 list_del_init (&req->queue);
1351                                 req->req.status = -EOVERFLOW;
1352                                 dev_dbg (udc_dev(dum), "stale req = %p\n",
1353                                                 req);
1354
1355                                 spin_unlock (&dum->lock);
1356                                 req->req.complete (&ep->ep, &req->req);
1357                                 spin_lock (&dum->lock);
1358                                 ep->already_seen = 0;
1359                                 goto restart;
1360                         }
1361
1362                         /* gadget driver never sees set_address or operations
1363                          * on standard feature flags.  some hardware doesn't
1364                          * even expose them.
1365                          */
1366                         ep->last_io = jiffies;
1367                         ep->setup_stage = 0;
1368                         ep->halted = 0;
1369                         switch (setup.bRequest) {
1370                         case USB_REQ_SET_ADDRESS:
1371                                 if (setup.bRequestType != Dev_Request)
1372                                         break;
1373                                 dum->address = w_value;
1374                                 maybe_set_status (urb, 0);
1375                                 dev_dbg (udc_dev(dum), "set_address = %d\n",
1376                                                 w_value);
1377                                 value = 0;
1378                                 break;
1379                         case USB_REQ_SET_FEATURE:
1380                                 if (setup.bRequestType == Dev_Request) {
1381                                         value = 0;
1382                                         switch (w_value) {
1383                                         case USB_DEVICE_REMOTE_WAKEUP:
1384                                                 break;
1385                                         case USB_DEVICE_B_HNP_ENABLE:
1386                                                 dum->gadget.b_hnp_enable = 1;
1387                                                 break;
1388                                         case USB_DEVICE_A_HNP_SUPPORT:
1389                                                 dum->gadget.a_hnp_support = 1;
1390                                                 break;
1391                                         case USB_DEVICE_A_ALT_HNP_SUPPORT:
1392                                                 dum->gadget.a_alt_hnp_support
1393                                                         = 1;
1394                                                 break;
1395                                         default:
1396                                                 value = -EOPNOTSUPP;
1397                                         }
1398                                         if (value == 0) {
1399                                                 dum->devstatus |=
1400                                                         (1 << w_value);
1401                                                 maybe_set_status (urb, 0);
1402                                         }
1403
1404                                 } else if (setup.bRequestType == Ep_Request) {
1405                                         // endpoint halt
1406                                         ep2 = find_endpoint (dum, w_index);
1407                                         if (!ep2) {
1408                                                 value = -EOPNOTSUPP;
1409                                                 break;
1410                                         }
1411                                         ep2->halted = 1;
1412                                         value = 0;
1413                                         maybe_set_status (urb, 0);
1414                                 }
1415                                 break;
1416                         case USB_REQ_CLEAR_FEATURE:
1417                                 if (setup.bRequestType == Dev_Request) {
1418                                         switch (w_value) {
1419                                         case USB_DEVICE_REMOTE_WAKEUP:
1420                                                 dum->devstatus &= ~(1 <<
1421                                                         USB_DEVICE_REMOTE_WAKEUP);
1422                                                 value = 0;
1423                                                 maybe_set_status (urb, 0);
1424                                                 break;
1425                                         default:
1426                                                 value = -EOPNOTSUPP;
1427                                                 break;
1428                                         }
1429                                 } else if (setup.bRequestType == Ep_Request) {
1430                                         // endpoint halt
1431                                         ep2 = find_endpoint (dum, w_index);
1432                                         if (!ep2) {
1433                                                 value = -EOPNOTSUPP;
1434                                                 break;
1435                                         }
1436                                         ep2->halted = 0;
1437                                         value = 0;
1438                                         maybe_set_status (urb, 0);
1439                                 }
1440                                 break;
1441                         case USB_REQ_GET_STATUS:
1442                                 if (setup.bRequestType == Dev_InRequest
1443                                                 || setup.bRequestType
1444                                                         == Intf_InRequest
1445                                                 || setup.bRequestType
1446                                                         == Ep_InRequest
1447                                                 ) {
1448                                         char *buf;
1449
1450                                         // device: remote wakeup, selfpowered
1451                                         // interface: nothing
1452                                         // endpoint: halt
1453                                         buf = (char *)urb->transfer_buffer;
1454                                         if (urb->transfer_buffer_length > 0) {
1455                                                 if (setup.bRequestType ==
1456                                                                 Ep_InRequest) {
1457         ep2 = find_endpoint (dum, w_index);
1458         if (!ep2) {
1459                 value = -EOPNOTSUPP;
1460                 break;
1461         }
1462         buf [0] = ep2->halted;
1463                                                 } else if (setup.bRequestType ==
1464                                                                 Dev_InRequest) {
1465                                                         buf [0] = (u8)
1466                                                                 dum->devstatus;
1467                                                 } else
1468                                                         buf [0] = 0;
1469                                         }
1470                                         if (urb->transfer_buffer_length > 1)
1471                                                 buf [1] = 0;
1472                                         urb->actual_length = min (2,
1473                                                 urb->transfer_buffer_length);
1474                                         value = 0;
1475                                         maybe_set_status (urb, 0);
1476                                 }
1477                                 break;
1478                         }
1479
1480                         /* gadget driver handles all other requests.  block
1481                          * until setup() returns; no reentrancy issues etc.
1482                          */
1483                         if (value > 0) {
1484                                 spin_unlock (&dum->lock);
1485                                 value = dum->driver->setup (&dum->gadget,
1486                                                 &setup);
1487                                 spin_lock (&dum->lock);
1488
1489                                 if (value >= 0) {
1490                                         /* no delays (max 64KB data stage) */
1491                                         limit = 64*1024;
1492                                         goto treat_control_like_bulk;
1493                                 }
1494                                 /* error, see below */
1495                         }
1496
1497                         if (value < 0) {
1498                                 if (value != -EOPNOTSUPP)
1499                                         dev_dbg (udc_dev(dum),
1500                                                 "setup --> %d\n",
1501                                                 value);
1502                                 maybe_set_status (urb, -EPIPE);
1503                                 urb->actual_length = 0;
1504                         }
1505
1506                         goto return_urb;
1507                 }
1508
1509                 /* non-control requests */
1510                 limit = total;
1511                 switch (usb_pipetype (urb->pipe)) {
1512                 case PIPE_ISOCHRONOUS:
1513                         /* FIXME is it urb->interval since the last xfer?
1514                          * use urb->iso_frame_desc[i].
1515                          * complete whether or not ep has requests queued.
1516                          * report random errors, to debug drivers.
1517                          */
1518                         limit = max (limit, periodic_bytes (dum, ep));
1519                         maybe_set_status (urb, -ENOSYS);
1520                         break;
1521
1522                 case PIPE_INTERRUPT:
1523                         /* FIXME is it urb->interval since the last xfer?
1524                          * this almost certainly polls too fast.
1525                          */
1526                         limit = max (limit, periodic_bytes (dum, ep));
1527                         /* FALLTHROUGH */
1528
1529                 // case PIPE_BULK:  case PIPE_CONTROL:
1530                 default:
1531                 treat_control_like_bulk:
1532                         ep->last_io = jiffies;
1533                         total = transfer (dum, urb, ep, limit);
1534                         break;
1535                 }
1536
1537                 /* incomplete transfer? */
1538                 if (urb->status == -EINPROGRESS)
1539                         continue;
1540
1541 return_urb:
1542                 urb->hcpriv = NULL;
1543                 list_del (&urbp->urbp_list);
1544                 kfree (urbp);
1545                 if (ep)
1546                         ep->already_seen = ep->setup_stage = 0;
1547
1548                 spin_unlock (&dum->lock);
1549                 usb_hcd_giveback_urb (dummy_to_hcd(dum), urb, NULL);
1550                 spin_lock (&dum->lock);
1551
1552                 goto restart;
1553         }
1554
1555         if (list_empty (&dum->urbp_list)) {
1556                 usb_put_dev (dum->udev);
1557                 dum->udev = NULL;
1558         } else if (dum->rh_state == DUMMY_RH_RUNNING) {
1559                 /* want a 1 msec delay here */
1560                 mod_timer (&dum->timer, jiffies + msecs_to_jiffies(1));
1561         }
1562
1563         spin_unlock_irqrestore (&dum->lock, flags);
1564 }
1565
1566 /*-------------------------------------------------------------------------*/
1567
1568 #define PORT_C_MASK \
1569         ((USB_PORT_STAT_C_CONNECTION \
1570         | USB_PORT_STAT_C_ENABLE \
1571         | USB_PORT_STAT_C_SUSPEND \
1572         | USB_PORT_STAT_C_OVERCURRENT \
1573         | USB_PORT_STAT_C_RESET) << 16)
1574
1575 static int dummy_hub_status (struct usb_hcd *hcd, char *buf)
1576 {
1577         struct dummy            *dum;
1578         unsigned long           flags;
1579         int                     retval = 0;
1580
1581         dum = hcd_to_dummy (hcd);
1582
1583         spin_lock_irqsave (&dum->lock, flags);
1584         if (hcd->state != HC_STATE_RUNNING)
1585                 goto done;
1586
1587         if (dum->resuming && time_after_eq (jiffies, dum->re_timeout)) {
1588                 dum->port_status |= (USB_PORT_STAT_C_SUSPEND << 16);
1589                 dum->port_status &= ~USB_PORT_STAT_SUSPEND;
1590                 set_link_state (dum);
1591         }
1592
1593         if ((dum->port_status & PORT_C_MASK) != 0) {
1594                 *buf = (1 << 1);
1595                 dev_dbg (dummy_dev(dum), "port status 0x%08x has changes\n",
1596                                 dum->port_status);
1597                 retval = 1;
1598                 if (dum->rh_state == DUMMY_RH_SUSPENDED)
1599                         usb_hcd_resume_root_hub (hcd);
1600         }
1601 done:
1602         spin_unlock_irqrestore (&dum->lock, flags);
1603         return retval;
1604 }
1605
1606 static inline void
1607 hub_descriptor (struct usb_hub_descriptor *desc)
1608 {
1609         memset (desc, 0, sizeof *desc);
1610         desc->bDescriptorType = 0x29;
1611         desc->bDescLength = 9;
1612         desc->wHubCharacteristics = (__force __u16)
1613                         (__constant_cpu_to_le16 (0x0001));
1614         desc->bNbrPorts = 1;
1615         desc->bitmap [0] = 0xff;
1616         desc->bitmap [1] = 0xff;
1617 }
1618
1619 static int dummy_hub_control (
1620         struct usb_hcd  *hcd,
1621         u16             typeReq,
1622         u16             wValue,
1623         u16             wIndex,
1624         char            *buf,
1625         u16             wLength
1626 ) {
1627         struct dummy    *dum;
1628         int             retval = 0;
1629         unsigned long   flags;
1630
1631         if (hcd->state != HC_STATE_RUNNING)
1632                 return -ETIMEDOUT;
1633
1634         dum = hcd_to_dummy (hcd);
1635         spin_lock_irqsave (&dum->lock, flags);
1636         switch (typeReq) {
1637         case ClearHubFeature:
1638                 break;
1639         case ClearPortFeature:
1640                 switch (wValue) {
1641                 case USB_PORT_FEAT_SUSPEND:
1642                         if (dum->port_status & USB_PORT_STAT_SUSPEND) {
1643                                 /* 20msec resume signaling */
1644                                 dum->resuming = 1;
1645                                 dum->re_timeout = jiffies +
1646                                                 msecs_to_jiffies(20);
1647                         }
1648                         break;
1649                 case USB_PORT_FEAT_POWER:
1650                         if (dum->port_status & USB_PORT_STAT_POWER)
1651                                 dev_dbg (dummy_dev(dum), "power-off\n");
1652                         /* FALLS THROUGH */
1653                 default:
1654                         dum->port_status &= ~(1 << wValue);
1655                         set_link_state (dum);
1656                 }
1657                 break;
1658         case GetHubDescriptor:
1659                 hub_descriptor ((struct usb_hub_descriptor *) buf);
1660                 break;
1661         case GetHubStatus:
1662                 *(__le32 *) buf = __constant_cpu_to_le32 (0);
1663                 break;
1664         case GetPortStatus:
1665                 if (wIndex != 1)
1666                         retval = -EPIPE;
1667
1668                 /* whoever resets or resumes must GetPortStatus to
1669                  * complete it!!
1670                  */
1671                 if (dum->resuming &&
1672                                 time_after_eq (jiffies, dum->re_timeout)) {
1673                         dum->port_status |= (USB_PORT_STAT_C_SUSPEND << 16);
1674                         dum->port_status &= ~USB_PORT_STAT_SUSPEND;
1675                 }
1676                 if ((dum->port_status & USB_PORT_STAT_RESET) != 0 &&
1677                                 time_after_eq (jiffies, dum->re_timeout)) {
1678                         dum->port_status |= (USB_PORT_STAT_C_RESET << 16);
1679                         dum->port_status &= ~USB_PORT_STAT_RESET;
1680                         if (dum->pullup) {
1681                                 dum->port_status |= USB_PORT_STAT_ENABLE;
1682                                 /* give it the best speed we agree on */
1683                                 dum->gadget.speed = dum->driver->speed;
1684                                 dum->gadget.ep0->maxpacket = 64;
1685                                 switch (dum->gadget.speed) {
1686                                 case USB_SPEED_HIGH:
1687                                         dum->port_status |=
1688                                                 USB_PORT_STAT_HIGH_SPEED;
1689                                         break;
1690                                 case USB_SPEED_LOW:
1691                                         dum->gadget.ep0->maxpacket = 8;
1692                                         dum->port_status |=
1693                                                 USB_PORT_STAT_LOW_SPEED;
1694                                         break;
1695                                 default:
1696                                         dum->gadget.speed = USB_SPEED_FULL;
1697                                         break;
1698                                 }
1699                         }
1700                 }
1701                 set_link_state (dum);
1702                 ((__le16 *) buf)[0] = cpu_to_le16 (dum->port_status);
1703                 ((__le16 *) buf)[1] = cpu_to_le16 (dum->port_status >> 16);
1704                 break;
1705         case SetHubFeature:
1706                 retval = -EPIPE;
1707                 break;
1708         case SetPortFeature:
1709                 switch (wValue) {
1710                 case USB_PORT_FEAT_SUSPEND:
1711                         if (dum->active) {
1712                                 dum->port_status |= USB_PORT_STAT_SUSPEND;
1713
1714                                 /* HNP would happen here; for now we
1715                                  * assume b_bus_req is always true.
1716                                  */
1717                                 set_link_state (dum);
1718                                 if (((1 << USB_DEVICE_B_HNP_ENABLE)
1719                                                 & dum->devstatus) != 0)
1720                                         dev_dbg (dummy_dev(dum),
1721                                                         "no HNP yet!\n");
1722                         }
1723                         break;
1724                 case USB_PORT_FEAT_POWER:
1725                         dum->port_status |= USB_PORT_STAT_POWER;
1726                         set_link_state (dum);
1727                         break;
1728                 case USB_PORT_FEAT_RESET:
1729                         /* if it's already enabled, disable */
1730                         dum->port_status &= ~(USB_PORT_STAT_ENABLE
1731                                         | USB_PORT_STAT_LOW_SPEED
1732                                         | USB_PORT_STAT_HIGH_SPEED);
1733                         dum->devstatus = 0;
1734                         /* 50msec reset signaling */
1735                         dum->re_timeout = jiffies + msecs_to_jiffies(50);
1736                         /* FALLS THROUGH */
1737                 default:
1738                         if ((dum->port_status & USB_PORT_STAT_POWER) != 0) {
1739                                 dum->port_status |= (1 << wValue);
1740                                 set_link_state (dum);
1741                         }
1742                 }
1743                 break;
1744
1745         default:
1746                 dev_dbg (dummy_dev(dum),
1747                         "hub control req%04x v%04x i%04x l%d\n",
1748                         typeReq, wValue, wIndex, wLength);
1749
1750                 /* "protocol stall" on error */
1751                 retval = -EPIPE;
1752         }
1753         spin_unlock_irqrestore (&dum->lock, flags);
1754
1755         if ((dum->port_status & PORT_C_MASK) != 0)
1756                 usb_hcd_poll_rh_status (hcd);
1757         return retval;
1758 }
1759
1760 static int dummy_hub_suspend (struct usb_hcd *hcd)
1761 {
1762         struct dummy *dum = hcd_to_dummy (hcd);
1763
1764         spin_lock_irq (&dum->lock);
1765         dum->rh_state = DUMMY_RH_SUSPENDED;
1766         set_link_state (dum);
1767         spin_unlock_irq (&dum->lock);
1768         return 0;
1769 }
1770
1771 static int dummy_hub_resume (struct usb_hcd *hcd)
1772 {
1773         struct dummy *dum = hcd_to_dummy (hcd);
1774
1775         spin_lock_irq (&dum->lock);
1776         dum->rh_state = DUMMY_RH_RUNNING;
1777         set_link_state (dum);
1778         if (!list_empty(&dum->urbp_list))
1779                 mod_timer (&dum->timer, jiffies);
1780         spin_unlock_irq (&dum->lock);
1781         return 0;
1782 }
1783
1784 /*-------------------------------------------------------------------------*/
1785
1786 static inline ssize_t
1787 show_urb (char *buf, size_t size, struct urb *urb)
1788 {
1789         int ep = usb_pipeendpoint (urb->pipe);
1790
1791         return snprintf (buf, size,
1792                 "urb/%p %s ep%d%s%s len %d/%d\n",
1793                 urb,
1794                 ({ char *s;
1795                  switch (urb->dev->speed) {
1796                  case USB_SPEED_LOW:    s = "ls"; break;
1797                  case USB_SPEED_FULL:   s = "fs"; break;
1798                  case USB_SPEED_HIGH:   s = "hs"; break;
1799                  default:               s = "?"; break;
1800                  }; s; }),
1801                 ep, ep ? (usb_pipein (urb->pipe) ? "in" : "out") : "",
1802                 ({ char *s; \
1803                  switch (usb_pipetype (urb->pipe)) { \
1804                  case PIPE_CONTROL:     s = ""; break; \
1805                  case PIPE_BULK:        s = "-bulk"; break; \
1806                  case PIPE_INTERRUPT:   s = "-int"; break; \
1807                  default:               s = "-iso"; break; \
1808                 }; s;}),
1809                 urb->actual_length, urb->transfer_buffer_length);
1810 }
1811
1812 static ssize_t
1813 show_urbs (struct device *dev, struct device_attribute *attr, char *buf)
1814 {
1815         struct usb_hcd          *hcd = dev_get_drvdata (dev);
1816         struct dummy            *dum = hcd_to_dummy (hcd);
1817         struct urbp             *urbp;
1818         size_t                  size = 0;
1819         unsigned long           flags;
1820
1821         spin_lock_irqsave (&dum->lock, flags);
1822         list_for_each_entry (urbp, &dum->urbp_list, urbp_list) {
1823                 size_t          temp;
1824
1825                 temp = show_urb (buf, PAGE_SIZE - size, urbp->urb);
1826                 buf += temp;
1827                 size += temp;
1828         }
1829         spin_unlock_irqrestore (&dum->lock, flags);
1830
1831         return size;
1832 }
1833 static DEVICE_ATTR (urbs, S_IRUGO, show_urbs, NULL);
1834
1835 static int dummy_start (struct usb_hcd *hcd)
1836 {
1837         struct dummy            *dum;
1838
1839         dum = hcd_to_dummy (hcd);
1840
1841         /*
1842          * MASTER side init ... we emulate a root hub that'll only ever
1843          * talk to one device (the slave side).  Also appears in sysfs,
1844          * just like more familiar pci-based HCDs.
1845          */
1846         spin_lock_init (&dum->lock);
1847         init_timer (&dum->timer);
1848         dum->timer.function = dummy_timer;
1849         dum->timer.data = (unsigned long) dum;
1850         dum->rh_state = DUMMY_RH_RUNNING;
1851
1852         INIT_LIST_HEAD (&dum->urbp_list);
1853
1854         /* only show a low-power port: just 8mA */
1855         hcd->power_budget = 8;
1856         hcd->state = HC_STATE_RUNNING;
1857         hcd->uses_new_polling = 1;
1858
1859 #ifdef CONFIG_USB_OTG
1860         hcd->self.otg_port = 1;
1861 #endif
1862
1863         /* FIXME 'urbs' should be a per-device thing, maybe in usbcore */
1864         device_create_file (dummy_dev(dum), &dev_attr_urbs);
1865         return 0;
1866 }
1867
1868 static void dummy_stop (struct usb_hcd *hcd)
1869 {
1870         struct dummy            *dum;
1871
1872         dum = hcd_to_dummy (hcd);
1873
1874         device_remove_file (dummy_dev(dum), &dev_attr_urbs);
1875         usb_gadget_unregister_driver (dum->driver);
1876         dev_info (dummy_dev(dum), "stopped\n");
1877 }
1878
1879 /*-------------------------------------------------------------------------*/
1880
1881 static int dummy_h_get_frame (struct usb_hcd *hcd)
1882 {
1883         return dummy_g_get_frame (NULL);
1884 }
1885
1886 static const struct hc_driver dummy_hcd = {
1887         .description =          (char *) driver_name,
1888         .product_desc =         "Dummy host controller",
1889         .hcd_priv_size =        sizeof(struct dummy),
1890
1891         .flags =                HCD_USB2,
1892
1893         .start =                dummy_start,
1894         .stop =                 dummy_stop,
1895
1896         .urb_enqueue =          dummy_urb_enqueue,
1897         .urb_dequeue =          dummy_urb_dequeue,
1898
1899         .get_frame_number =     dummy_h_get_frame,
1900
1901         .hub_status_data =      dummy_hub_status,
1902         .hub_control =          dummy_hub_control,
1903         .hub_suspend =          dummy_hub_suspend,
1904         .hub_resume =           dummy_hub_resume,
1905 };
1906
1907 static int dummy_hcd_probe (struct device *dev)
1908 {
1909         struct usb_hcd          *hcd;
1910         int                     retval;
1911
1912         dev_info (dev, "%s, driver " DRIVER_VERSION "\n", driver_desc);
1913
1914         hcd = usb_create_hcd (&dummy_hcd, dev, dev->bus_id);
1915         if (!hcd)
1916                 return -ENOMEM;
1917         the_controller = hcd_to_dummy (hcd);
1918
1919         retval = usb_add_hcd(hcd, 0, 0);
1920         if (retval != 0) {
1921                 usb_put_hcd (hcd);
1922                 the_controller = NULL;
1923         }
1924         return retval;
1925 }
1926
1927 static int dummy_hcd_remove (struct device *dev)
1928 {
1929         struct usb_hcd          *hcd;
1930
1931         hcd = dev_get_drvdata (dev);
1932         usb_remove_hcd (hcd);
1933         usb_put_hcd (hcd);
1934         the_controller = NULL;
1935         return 0;
1936 }
1937
1938 static int dummy_hcd_suspend (struct device *dev, pm_message_t state,
1939                 u32 level)
1940 {
1941         struct usb_hcd          *hcd;
1942
1943         if (level != SUSPEND_DISABLE)
1944                 return 0;
1945
1946         dev_dbg (dev, "%s\n", __FUNCTION__);
1947         hcd = dev_get_drvdata (dev);
1948
1949 #ifndef CONFIG_USB_SUSPEND
1950         /* Otherwise this would never happen */
1951         usb_lock_device (hcd->self.root_hub);
1952         dummy_hub_suspend (hcd);
1953         usb_unlock_device (hcd->self.root_hub);
1954 #endif
1955
1956         hcd->state = HC_STATE_SUSPENDED;
1957         return 0;
1958 }
1959
1960 static int dummy_hcd_resume (struct device *dev, u32 level)
1961 {
1962         struct usb_hcd          *hcd;
1963
1964         if (level != RESUME_ENABLE)
1965                 return 0;
1966
1967         dev_dbg (dev, "%s\n", __FUNCTION__);
1968         hcd = dev_get_drvdata (dev);
1969         hcd->state = HC_STATE_RUNNING;
1970
1971 #ifndef CONFIG_USB_SUSPEND
1972         /* Otherwise this would never happen */
1973         usb_lock_device (hcd->self.root_hub);
1974         dummy_hub_resume (hcd);
1975         usb_unlock_device (hcd->self.root_hub);
1976 #endif
1977
1978         usb_hcd_poll_rh_status (hcd);
1979         return 0;
1980 }
1981
1982 static struct device_driver dummy_hcd_driver = {
1983         .name           = (char *) driver_name,
1984         .bus            = &platform_bus_type,
1985         .probe          = dummy_hcd_probe,
1986         .remove         = dummy_hcd_remove,
1987         .suspend        = dummy_hcd_suspend,
1988         .resume         = dummy_hcd_resume,
1989 };
1990
1991 /*-------------------------------------------------------------------------*/
1992
1993 /* These don't need to do anything because the pdev structures are
1994  * statically allocated. */
1995 static void
1996 dummy_udc_release (struct device *dev) {}
1997
1998 static void
1999 dummy_hcd_release (struct device *dev) {}
2000
2001 static struct platform_device           the_udc_pdev = {
2002         .name           = (char *) gadget_name,
2003         .id             = -1,
2004         .dev            = {
2005                 .release        = dummy_udc_release,
2006         },
2007 };
2008
2009 static struct platform_device           the_hcd_pdev = {
2010         .name           = (char *) driver_name,
2011         .id             = -1,
2012         .dev            = {
2013                 .release        = dummy_hcd_release,
2014         },
2015 };
2016
2017 static int __init init (void)
2018 {
2019         int     retval;
2020
2021         if (usb_disabled ())
2022                 return -ENODEV;
2023
2024         retval = driver_register (&dummy_hcd_driver);
2025         if (retval < 0)
2026                 return retval;
2027
2028         retval = driver_register (&dummy_udc_driver);
2029         if (retval < 0)
2030                 goto err_register_udc_driver;
2031
2032         retval = platform_device_register (&the_hcd_pdev);
2033         if (retval < 0)
2034                 goto err_register_hcd;
2035
2036         retval = platform_device_register (&the_udc_pdev);
2037         if (retval < 0)
2038                 goto err_register_udc;
2039         return retval;
2040
2041 err_register_udc:
2042         platform_device_unregister (&the_hcd_pdev);
2043 err_register_hcd:
2044         driver_unregister (&dummy_udc_driver);
2045 err_register_udc_driver:
2046         driver_unregister (&dummy_hcd_driver);
2047         return retval;
2048 }
2049 module_init (init);
2050
2051 static void __exit cleanup (void)
2052 {
2053         platform_device_unregister (&the_udc_pdev);
2054         platform_device_unregister (&the_hcd_pdev);
2055         driver_unregister (&dummy_udc_driver);
2056         driver_unregister (&dummy_hcd_driver);
2057 }
2058 module_exit (cleanup);