drivers/usb/gadget/dummy_hcd.c

   1 /*
   2  * dummy_hcd.c -- Dummy/Loopback USB host and device emulator driver.
   3  *
   4  * Maintainer: Alan Stern <stern@rowland.harvard.edu>
   5  *
   6  * Copyright (C) 2003 David Brownell
   7  * Copyright (C) 2003-2005 Alan Stern
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  22  */
  23
  24
  25 /*
  26  * This exposes a device side "USB gadget" API, driven by requests to a
  27  * Linux-USB host controller driver.  USB traffic is simulated; there's
  28  * no need for USB hardware.  Use this with two other drivers:
  29  *
  30  *  - Gadget driver, responding to requests (slave);
  31  *  - Host-side device driver, as already familiar in Linux.
  32  *
  33  * Having this all in one kernel can help some stages of development,
  34  * bypassing some hardware (and driver) issues.  UML could help too.
  35  */
  36
  37 #define DEBUG
  38
  39 #include <linux/module.h>
  40 #include <linux/kernel.h>
  41 #include <linux/delay.h>
  42 #include <linux/ioport.h>
  43 #include <linux/sched.h>
  44 #include <linux/slab.h>
  45 #include <linux/smp_lock.h>
  46 #include <linux/errno.h>
  47 #include <linux/init.h>
  48 #include <linux/timer.h>
  49 #include <linux/list.h>
  50 #include <linux/interrupt.h>
  51 #include <linux/platform_device.h>
  52 #include <linux/usb.h>
  53 #include <linux/usb_gadget.h>
  54
  55 #include <asm/byteorder.h>
  56 #include <asm/io.h>
  57 #include <asm/irq.h>
  58 #include <asm/system.h>
  59 #include <asm/unaligned.h>
  60
  61
  62 #include "../core/hcd.h"
  63
  64
  65 #define DRIVER_DESC     "USB Host+Gadget Emulator"
  66 #define DRIVER_VERSION  "02 May 2005"
  67
  68 static const char       driver_name [] = "dummy_hcd";
  69 static const char       driver_desc [] = "USB Host+Gadget Emulator";
  70
  71 static const char       gadget_name [] = "dummy_udc";
  72
  73 MODULE_DESCRIPTION (DRIVER_DESC);
  74 MODULE_AUTHOR ("David Brownell");
  75 MODULE_LICENSE ("GPL");
  76
  77 /*-------------------------------------------------------------------------*/
  78
  79 /* gadget side driver data structres */
  80 struct dummy_ep {
  81         struct list_head                queue;
  82         unsigned long                   last_io;        /* jiffies timestamp */
  83         struct usb_gadget               *gadget;
  84         const struct usb_endpoint_descriptor *desc;
  85         struct usb_ep                   ep;
  86         unsigned                        halted : 1;
  87         unsigned                        already_seen : 1;
  88         unsigned                        setup_stage : 1;
  89 };
  90
  91 struct dummy_request {
  92         struct list_head                queue;          /* ep's requests */
  93         struct usb_request              req;
  94 };
  95
  96 static inline struct dummy_ep *usb_ep_to_dummy_ep (struct usb_ep *_ep)
  97 {
  98         return container_of (_ep, struct dummy_ep, ep);
  99 }
 100
 101 static inline struct dummy_request *usb_request_to_dummy_request
 102                 (struct usb_request *_req)
 103 {
 104         return container_of (_req, struct dummy_request, req);
 105 }
 106
 107 /*-------------------------------------------------------------------------*/
 108
 109 /*
 110  * Every device has ep0 for control requests, plus up to 30 more endpoints,
 111  * in one of two types:
 112  *
 113  *   - Configurable:  direction (in/out), type (bulk, iso, etc), and endpoint
 114  *     number can be changed.  Names like "ep-a" are used for this type.
 115  *
 116  *   - Fixed Function:  in other cases.  some characteristics may be mutable;
 117  *     that'd be hardware-specific.  Names like "ep12out-bulk" are used.
 118  *
 119  * Gadget drivers are responsible for not setting up conflicting endpoint
 120  * configurations, illegal or unsupported packet lengths, and so on.
 121  */
 122
 123 static const char ep0name [] = "ep0";
 124
 125 static const char *const ep_name [] = {
 126         ep0name,                                /* everyone has ep0 */
 127
 128         /* act like a net2280: high speed, six configurable endpoints */
 129         "ep-a", "ep-b", "ep-c", "ep-d", "ep-e", "ep-f",
 130
 131         /* or like pxa250: fifteen fixed function endpoints */
 132         "ep1in-bulk", "ep2out-bulk", "ep3in-iso", "ep4out-iso", "ep5in-int",
 133         "ep6in-bulk", "ep7out-bulk", "ep8in-iso", "ep9out-iso", "ep10in-int",
 134         "ep11in-bulk", "ep12out-bulk", "ep13in-iso", "ep14out-iso",
 135                 "ep15in-int",
 136
 137         /* or like sa1100: two fixed function endpoints */
 138         "ep1out-bulk", "ep2in-bulk",
 139 };
 140 #define DUMMY_ENDPOINTS ARRAY_SIZE(ep_name)
 141
 142 /*-------------------------------------------------------------------------*/
 143
 144 #define FIFO_SIZE               64
 145
 146 struct urbp {
 147         struct urb              *urb;
 148         struct list_head        urbp_list;
 149 };
 150
 151
 152 enum dummy_rh_state {
 153         DUMMY_RH_RESET,
 154         DUMMY_RH_SUSPENDED,
 155         DUMMY_RH_RUNNING
 156 };
 157
 158 struct dummy {
 159         spinlock_t                      lock;
 160
 161         /*
 162          * SLAVE/GADGET side support
 163          */
 164         struct dummy_ep                 ep [DUMMY_ENDPOINTS];
 165         int                             address;
 166         struct usb_gadget               gadget;
 167         struct usb_gadget_driver        *driver;
 168         struct dummy_request            fifo_req;
 169         u8                              fifo_buf [FIFO_SIZE];
 170         u16                             devstatus;
 171         unsigned                        udc_suspended:1;
 172         unsigned                        pullup:1;
 173         unsigned                        active:1;
 174         unsigned                        old_active:1;
 175
 176         /*
 177          * MASTER/HOST side support
 178          */
 179         enum dummy_rh_state             rh_state;
 180         struct timer_list               timer;
 181         u32                             port_status;
 182         u32                             old_status;
 183         unsigned                        resuming:1;
 184         unsigned long                   re_timeout;
 185
 186         struct usb_device               *udev;
 187         struct list_head                urbp_list;
 188 };
 189
 190 static inline struct dummy *hcd_to_dummy (struct usb_hcd *hcd)
 191 {
 192         return (struct dummy *) (hcd->hcd_priv);
 193 }
 194
 195 static inline struct usb_hcd *dummy_to_hcd (struct dummy *dum)
 196 {
 197         return container_of((void *) dum, struct usb_hcd, hcd_priv);
 198 }
 199
 200 static inline struct device *dummy_dev (struct dummy *dum)
 201 {
 202         return dummy_to_hcd(dum)->self.controller;
 203 }
 204
 205 static inline struct device *udc_dev (struct dummy *dum)
 206 {
 207         return dum->gadget.dev.parent;
 208 }
 209
 210 static inline struct dummy *ep_to_dummy (struct dummy_ep *ep)
 211 {
 212         return container_of (ep->gadget, struct dummy, gadget);
 213 }
 214
 215 static inline struct dummy *gadget_to_dummy (struct usb_gadget *gadget)
 216 {
 217         return container_of (gadget, struct dummy, gadget);
 218 }
 219
 220 static inline struct dummy *gadget_dev_to_dummy (struct device *dev)
 221 {
 222         return container_of (dev, struct dummy, gadget.dev);
 223 }
 224
 225 static struct dummy                     *the_controller;
 226
 227 /*-------------------------------------------------------------------------*/
 228
 229 /* SLAVE/GADGET SIDE UTILITY ROUTINES */
 230
 231 /* called with spinlock held */
 232 static void nuke (struct dummy *dum, struct dummy_ep *ep)
 233 {
 234         while (!list_empty (&ep->queue)) {
 235                 struct dummy_request    *req;
 236
 237                 req = list_entry (ep->queue.next, struct dummy_request, queue);
 238                 list_del_init (&req->queue);
 239                 req->req.status = -ESHUTDOWN;
 240
 241                 spin_unlock (&dum->lock);
 242                 req->req.complete (&ep->ep, &req->req);
 243                 spin_lock (&dum->lock);
 244         }
 245 }
 246
 247 /* caller must hold lock */
 248 static void
 249 stop_activity (struct dummy *dum)
 250 {
 251         struct dummy_ep *ep;
 252
 253         /* prevent any more requests */
 254         dum->address = 0;
 255
 256         /* The timer is left running so that outstanding URBs can fail */
 257
 258         /* nuke any pending requests first, so driver i/o is quiesced */
 259         list_for_each_entry (ep, &dum->gadget.ep_list, ep.ep_list)
 260                 nuke (dum, ep);
 261
 262         /* driver now does any non-usb quiescing necessary */
 263 }
 264
 265 /* caller must hold lock */
 266 static void
 267 set_link_state (struct dummy *dum)
 268 {
 269         dum->active = 0;
 270         if ((dum->port_status & USB_PORT_STAT_POWER) == 0)
 271                 dum->port_status = 0;
 272
 273         /* UDC suspend must cause a disconnect */
 274         else if (!dum->pullup || dum->udc_suspended) {
 275                 dum->port_status &= ~(USB_PORT_STAT_CONNECTION |
 276                                         USB_PORT_STAT_ENABLE |
 277                                         USB_PORT_STAT_LOW_SPEED |
 278                                         USB_PORT_STAT_HIGH_SPEED |
 279                                         USB_PORT_STAT_SUSPEND);
 280                 if ((dum->old_status & USB_PORT_STAT_CONNECTION) != 0)
 281                         dum->port_status |= (USB_PORT_STAT_C_CONNECTION << 16);
 282         } else {
 283                 dum->port_status |= USB_PORT_STAT_CONNECTION;
 284                 if ((dum->old_status & USB_PORT_STAT_CONNECTION) == 0)
 285                         dum->port_status |= (USB_PORT_STAT_C_CONNECTION << 16);
 286                 if ((dum->port_status & USB_PORT_STAT_ENABLE) == 0)
 287                         dum->port_status &= ~USB_PORT_STAT_SUSPEND;
 288                 else if ((dum->port_status & USB_PORT_STAT_SUSPEND) == 0 &&
 289                                 dum->rh_state != DUMMY_RH_SUSPENDED)
 290                         dum->active = 1;
 291         }
 292
 293         if ((dum->port_status & USB_PORT_STAT_ENABLE) == 0 || dum->active)
 294                 dum->resuming = 0;
 295
 296         if ((dum->port_status & USB_PORT_STAT_CONNECTION) == 0 ||
 297                         (dum->port_status & USB_PORT_STAT_RESET) != 0) {
 298                 if ((dum->old_status & USB_PORT_STAT_CONNECTION) != 0 &&
 299                                 (dum->old_status & USB_PORT_STAT_RESET) == 0 &&
 300                                 dum->driver) {
 301                         stop_activity (dum);
 302                         spin_unlock (&dum->lock);
 303                         dum->driver->disconnect (&dum->gadget);
 304                         spin_lock (&dum->lock);
 305                 }
 306         } else if (dum->active != dum->old_active) {
 307                 if (dum->old_active && dum->driver->suspend) {
 308                         spin_unlock (&dum->lock);
 309                         dum->driver->suspend (&dum->gadget);
 310                         spin_lock (&dum->lock);
 311                 } else if (!dum->old_active && dum->driver->resume) {
 312                         spin_unlock (&dum->lock);
 313                         dum->driver->resume (&dum->gadget);
 314                         spin_lock (&dum->lock);
 315                 }
 316         }
 317
 318         dum->old_status = dum->port_status;
 319         dum->old_active = dum->active;
 320 }
 321
 322 /*-------------------------------------------------------------------------*/
 323
 324 /* SLAVE/GADGET SIDE DRIVER
 325  *
 326  * This only tracks gadget state.  All the work is done when the host
 327  * side tries some (emulated) i/o operation.  Real device controller
 328  * drivers would do real i/o using dma, fifos, irqs, timers, etc.
 329  */
 330
 331 #define is_enabled(dum) \
 332         (dum->port_status & USB_PORT_STAT_ENABLE)
 333
 334 static int
 335 dummy_enable (struct usb_ep *_ep, const struct usb_endpoint_descriptor *desc)
 336 {
 337         struct dummy            *dum;
 338         struct dummy_ep         *ep;
 339         unsigned                max;
 340         int                     retval;
 341
 342         ep = usb_ep_to_dummy_ep (_ep);
 343         if (!_ep || !desc || ep->desc || _ep->name == ep0name
 344                         || desc->bDescriptorType != USB_DT_ENDPOINT)
 345                 return -EINVAL;
 346         dum = ep_to_dummy (ep);
 347         if (!dum->driver || !is_enabled (dum))
 348                 return -ESHUTDOWN;
 349         max = le16_to_cpu(desc->wMaxPacketSize) & 0x3ff;
 350
 351         /* drivers must not request bad settings, since lower levels
 352          * (hardware or its drivers) may not check.  some endpoints
 353          * can't do iso, many have maxpacket limitations, etc.
 354          *
 355          * since this "hardware" driver is here to help debugging, we
 356          * have some extra sanity checks.  (there could be more though,
 357          * especially for "ep9out" style fixed function ones.)
 358          */
 359         retval = -EINVAL;
 360         switch (desc->bmAttributes & 0x03) {
 361         case USB_ENDPOINT_XFER_BULK:
 362                 if (strstr (ep->ep.name, "-iso")
 363                                 || strstr (ep->ep.name, "-int")) {
 364                         goto done;
 365                 }
 366                 switch (dum->gadget.speed) {
 367                 case USB_SPEED_HIGH:
 368                         if (max == 512)
 369                                 break;
 370                         /* conserve return statements */
 371                 default:
 372                         switch (max) {
 373                         case 8: case 16: case 32: case 64:
 374                                 /* we'll fake any legal size */
 375                                 break;
 376                         default:
 377                 case USB_SPEED_LOW:
 378                                 goto done;
 379                         }
 380                 }
 381                 break;
 382         case USB_ENDPOINT_XFER_INT:
 383                 if (strstr (ep->ep.name, "-iso")) /* bulk is ok */
 384                         goto done;
 385                 /* real hardware might not handle all packet sizes */
 386                 switch (dum->gadget.speed) {
 387                 case USB_SPEED_HIGH:
 388                         if (max <= 1024)
 389                                 break;
 390                         /* save a return statement */
 391                 case USB_SPEED_FULL:
 392                         if (max <= 64)
 393                                 break;
 394                         /* save a return statement */
 395                 default:
 396                         if (max <= 8)
 397                                 break;
 398                         goto done;
 399                 }
 400                 break;
 401         case USB_ENDPOINT_XFER_ISOC:
 402                 if (strstr (ep->ep.name, "-bulk")
 403                                 || strstr (ep->ep.name, "-int"))
 404                         goto done;
 405                 /* real hardware might not handle all packet sizes */
 406                 switch (dum->gadget.speed) {
 407                 case USB_SPEED_HIGH:
 408                         if (max <= 1024)
 409                                 break;
 410                         /* save a return statement */
 411                 case USB_SPEED_FULL:
 412                         if (max <= 1023)
 413                                 break;
 414                         /* save a return statement */
 415                 default:
 416                         goto done;
 417                 }
 418                 break;
 419         default:
 420                 /* few chips support control except on ep0 */
 421                 goto done;
 422         }
 423
 424         _ep->maxpacket = max;
 425         ep->desc = desc;
 426
 427         dev_dbg (udc_dev(dum), "enabled %s (ep%d%s-%s) maxpacket %d\n",
 428                 _ep->name,
 429                 desc->bEndpointAddress & 0x0f,
 430                 (desc->bEndpointAddress & USB_DIR_IN) ? "in" : "out",
 431                 ({ char *val;
 432                  switch (desc->bmAttributes & 0x03) {
 433                  case USB_ENDPOINT_XFER_BULK: val = "bulk"; break;
 434                  case USB_ENDPOINT_XFER_ISOC: val = "iso"; break;
 435                  case USB_ENDPOINT_XFER_INT: val = "intr"; break;
 436                  default: val = "ctrl"; break;
 437                  }; val; }),
 438                 max);
 439
 440         /* at this point real hardware should be NAKing transfers
 441          * to that endpoint, until a buffer is queued to it.
 442          */
 443         retval = 0;
 444 done:
 445         return retval;
 446 }
 447
 448 static int dummy_disable (struct usb_ep *_ep)
 449 {
 450         struct dummy_ep         *ep;
 451         struct dummy            *dum;
 452         unsigned long           flags;
 453         int                     retval;
 454
 455         ep = usb_ep_to_dummy_ep (_ep);
 456         if (!_ep || !ep->desc || _ep->name == ep0name)
 457                 return -EINVAL;
 458         dum = ep_to_dummy (ep);
 459
 460         spin_lock_irqsave (&dum->lock, flags);
 461         ep->desc = NULL;
 462         retval = 0;
 463         nuke (dum, ep);
 464         spin_unlock_irqrestore (&dum->lock, flags);
 465
 466         dev_dbg (udc_dev(dum), "disabled %s\n", _ep->name);
 467         return retval;
 468 }
 469
 470 static struct usb_request *
 471 dummy_alloc_request (struct usb_ep *_ep, gfp_t mem_flags)
 472 {
 473         struct dummy_ep         *ep;
 474         struct dummy_request    *req;
 475
 476         if (!_ep)
 477                 return NULL;
 478         ep = usb_ep_to_dummy_ep (_ep);
 479
 480         req = kzalloc(sizeof(*req), mem_flags);
 481         if (!req)
 482                 return NULL;
 483         INIT_LIST_HEAD (&req->queue);
 484         return &req->req;
 485 }
 486
 487 static void
 488 dummy_free_request (struct usb_ep *_ep, struct usb_request *_req)
 489 {
 490         struct dummy_ep         *ep;
 491         struct dummy_request    *req;
 492
 493         ep = usb_ep_to_dummy_ep (_ep);
 494         if (!ep || !_req || (!ep->desc && _ep->name != ep0name))
 495                 return;
 496
 497         req = usb_request_to_dummy_request (_req);
 498         WARN_ON (!list_empty (&req->queue));
 499         kfree (req);
 500 }
 501
 502 static void *
 503 dummy_alloc_buffer (
 504         struct usb_ep *_ep,
 505         unsigned bytes,
 506         dma_addr_t *dma,
 507         gfp_t mem_flags
 508 ) {
 509         char                    *retval;
 510         struct dummy_ep         *ep;
 511         struct dummy            *dum;
 512
 513         ep = usb_ep_to_dummy_ep (_ep);
 514         dum = ep_to_dummy (ep);
 515
 516         if (!dum->driver)
 517                 return NULL;
 518         retval = kmalloc (bytes, mem_flags);
 519         *dma = (dma_addr_t) retval;
 520         return retval;
 521 }
 522
 523 static void
 524 dummy_free_buffer (
 525         struct usb_ep *_ep,
 526         void *buf,
 527         dma_addr_t dma,
 528         unsigned bytes
 529 ) {
 530         if (bytes)
 531                 kfree (buf);
 532 }
 533
 534 static void
 535 fifo_complete (struct usb_ep *ep, struct usb_request *req)
 536 {
 537 }
 538
 539 static int
 540 dummy_queue (struct usb_ep *_ep, struct usb_request *_req,
 541                 gfp_t mem_flags)
 542 {
 543         struct dummy_ep         *ep;
 544         struct dummy_request    *req;
 545         struct dummy            *dum;
 546         unsigned long           flags;
 547
 548         req = usb_request_to_dummy_request (_req);
 549         if (!_req || !list_empty (&req->queue) || !_req->complete)
 550                 return -EINVAL;
 551
 552         ep = usb_ep_to_dummy_ep (_ep);
 553         if (!_ep || (!ep->desc && _ep->name != ep0name))
 554                 return -EINVAL;
 555
 556         dum = ep_to_dummy (ep);
 557         if (!dum->driver || !is_enabled (dum))
 558                 return -ESHUTDOWN;
 559
 560 #if 0
 561         dev_dbg (udc_dev(dum), "ep %p queue req %p to %s, len %d buf %p\n",
 562                         ep, _req, _ep->name, _req->length, _req->buf);
 563 #endif
 564
 565         _req->status = -EINPROGRESS;
 566         _req->actual = 0;
 567         spin_lock_irqsave (&dum->lock, flags);
 568
 569         /* implement an emulated single-request FIFO */
 570         if (ep->desc && (ep->desc->bEndpointAddress & USB_DIR_IN) &&
 571                         list_empty (&dum->fifo_req.queue) &&
 572                         list_empty (&ep->queue) &&
 573                         _req->length <= FIFO_SIZE) {
 574                 req = &dum->fifo_req;
 575                 req->req = *_req;
 576                 req->req.buf = dum->fifo_buf;
 577                 memcpy (dum->fifo_buf, _req->buf, _req->length);
 578                 req->req.context = dum;
 579                 req->req.complete = fifo_complete;
 580
 581                 spin_unlock (&dum->lock);
 582                 _req->actual = _req->length;
 583                 _req->status = 0;
 584                 _req->complete (_ep, _req);
 585                 spin_lock (&dum->lock);
 586         }
 587         list_add_tail (&req->queue, &ep->queue);
 588         spin_unlock_irqrestore (&dum->lock, flags);
 589
 590         /* real hardware would likely enable transfers here, in case
 591          * it'd been left NAKing.
 592          */
 593         return 0;
 594 }
 595
 596 static int dummy_dequeue (struct usb_ep *_ep, struct usb_request *_req)
 597 {
 598         struct dummy_ep         *ep;
 599         struct dummy            *dum;
 600         int                     retval = -EINVAL;
 601         unsigned long           flags;
 602         struct dummy_request    *req = NULL;
 603
 604         if (!_ep || !_req)
 605                 return retval;
 606         ep = usb_ep_to_dummy_ep (_ep);
 607         dum = ep_to_dummy (ep);
 608
 609         if (!dum->driver)
 610                 return -ESHUTDOWN;
 611
 612         local_irq_save (flags);
 613         spin_lock (&dum->lock);
 614         list_for_each_entry (req, &ep->queue, queue) {
 615                 if (&req->req == _req) {
 616                         list_del_init (&req->queue);
 617                         _req->status = -ECONNRESET;
 618                         retval = 0;
 619                         break;
 620                 }
 621         }
 622         spin_unlock (&dum->lock);
 623
 624         if (retval == 0) {
 625                 dev_dbg (udc_dev(dum),
 626                                 "dequeued req %p from %s, len %d buf %p\n",
 627                                 req, _ep->name, _req->length, _req->buf);
 628                 _req->complete (_ep, _req);
 629         }
 630         local_irq_restore (flags);
 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         struct dummy    *dum = gadget_dev_to_dummy (dev);
 893
 894         usb_put_hcd (dummy_to_hcd (dum));
 895 }
 896
 897 static int dummy_udc_probe (struct platform_device *pdev)
 898 {
 899         struct dummy    *dum = the_controller;
 900         int             rc;
 901
 902         dum->gadget.name = gadget_name;
 903         dum->gadget.ops = &dummy_ops;
 904         dum->gadget.is_dualspeed = 1;
 905
 906         /* maybe claim OTG support, though we won't complete HNP */
 907         dum->gadget.is_otg = (dummy_to_hcd(dum)->self.otg_port != 0);
 908
 909         strcpy (dum->gadget.dev.bus_id, "gadget");
 910         dum->gadget.dev.parent = &pdev->dev;
 911         dum->gadget.dev.release = dummy_gadget_release;
 912         rc = device_register (&dum->gadget.dev);
 913         if (rc < 0)
 914                 return rc;
 915
 916         usb_get_hcd (dummy_to_hcd (dum));
 917
 918         platform_set_drvdata (pdev, dum);
 919         device_create_file (&dum->gadget.dev, &dev_attr_function);
 920         return rc;
 921 }
 922
 923 static int dummy_udc_remove (struct platform_device *pdev)
 924 {
 925         struct dummy    *dum = platform_get_drvdata (pdev);
 926
 927         platform_set_drvdata (pdev, NULL);
 928         device_remove_file (&dum->gadget.dev, &dev_attr_function);
 929         device_unregister (&dum->gadget.dev);
 930         return 0;
 931 }
 932
 933 static int dummy_udc_suspend (struct platform_device *pdev, pm_message_t state)
 934 {
 935         struct dummy    *dum = platform_get_drvdata(pdev);
 936
 937         dev_dbg (&pdev->dev, "%s\n", __FUNCTION__);
 938         spin_lock_irq (&dum->lock);
 939         dum->udc_suspended = 1;
 940         set_link_state (dum);
 941         spin_unlock_irq (&dum->lock);
 942
 943         pdev->dev.power.power_state = state;
 944         usb_hcd_poll_rh_status (dummy_to_hcd (dum));
 945         return 0;
 946 }
 947
 948 static int dummy_udc_resume (struct platform_device *pdev)
 949 {
 950         struct dummy    *dum = platform_get_drvdata(pdev);
 951
 952         dev_dbg (&pdev->dev, "%s\n", __FUNCTION__);
 953         spin_lock_irq (&dum->lock);
 954         dum->udc_suspended = 0;
 955         set_link_state (dum);
 956         spin_unlock_irq (&dum->lock);
 957
 958         pdev->dev.power.power_state = PMSG_ON;
 959         usb_hcd_poll_rh_status (dummy_to_hcd (dum));
 960         return 0;
 961 }
 962
 963 static struct platform_driver dummy_udc_driver = {
 964         .probe          = dummy_udc_probe,
 965         .remove         = dummy_udc_remove,
 966         .suspend        = dummy_udc_suspend,
 967         .resume         = dummy_udc_resume,
 968         .driver         = {
 969                 .name   = (char *) gadget_name,
 970                 .owner  = THIS_MODULE,
 971         },
 972 };
 973
 974 /*-------------------------------------------------------------------------*/
 975
 976 /* MASTER/HOST SIDE DRIVER
 977  *
 978  * this uses the hcd framework to hook up to host side drivers.
 979  * its root hub will only have one device, otherwise it acts like
 980  * a normal host controller.
 981  *
 982  * when urbs are queued, they're just stuck on a list that we
 983  * scan in a timer callback.  that callback connects writes from
 984  * the host with reads from the device, and so on, based on the
 985  * usb 2.0 rules.
 986  */
 987
 988 static int dummy_urb_enqueue (
 989         struct usb_hcd                  *hcd,
 990         struct usb_host_endpoint        *ep,
 991         struct urb                      *urb,
 992         gfp_t                           mem_flags
 993 ) {
 994         struct dummy    *dum;
 995         struct urbp     *urbp;
 996         unsigned long   flags;
 997
 998         if (!urb->transfer_buffer && urb->transfer_buffer_length)
 999                 return -EINVAL;
1000
1001         urbp = kmalloc (sizeof *urbp, mem_flags);
1002         if (!urbp)
1003                 return -ENOMEM;
1004         urbp->urb = urb;
1005
1006         dum = hcd_to_dummy (hcd);
1007         spin_lock_irqsave (&dum->lock, flags);
1008
1009         if (!dum->udev) {
1010                 dum->udev = urb->dev;
1011                 usb_get_dev (dum->udev);
1012         } else if (unlikely (dum->udev != urb->dev))
1013                 dev_err (dummy_dev(dum), "usb_device address has changed!\n");
1014
1015         list_add_tail (&urbp->urbp_list, &dum->urbp_list);
1016         urb->hcpriv = urbp;
1017         if (usb_pipetype (urb->pipe) == PIPE_CONTROL)
1018                 urb->error_count = 1;           /* mark as a new urb */
1019
1020         /* kick the scheduler, it'll do the rest */
1021         if (!timer_pending (&dum->timer))
1022                 mod_timer (&dum->timer, jiffies + 1);
1023
1024         spin_unlock_irqrestore (&dum->lock, flags);
1025         return 0;
1026 }
1027
1028 static int dummy_urb_dequeue (struct usb_hcd *hcd, struct urb *urb)
1029 {
1030         struct dummy    *dum;
1031         unsigned long   flags;
1032
1033         /* giveback happens automatically in timer callback,
1034          * so make sure the callback happens */
1035         dum = hcd_to_dummy (hcd);
1036         spin_lock_irqsave (&dum->lock, flags);
1037         if (dum->rh_state != DUMMY_RH_RUNNING && !list_empty(&dum->urbp_list))
1038                 mod_timer (&dum->timer, jiffies);
1039         spin_unlock_irqrestore (&dum->lock, flags);
1040         return 0;
1041 }
1042
1043 static void maybe_set_status (struct urb *urb, int status)
1044 {
1045         spin_lock (&urb->lock);
1046         if (urb->status == -EINPROGRESS)
1047                 urb->status = status;
1048         spin_unlock (&urb->lock);
1049 }
1050
1051 /* transfer up to a frame's worth; caller must own lock */
1052 static int
1053 transfer (struct dummy *dum, struct urb *urb, struct dummy_ep *ep, int limit)
1054 {
1055         struct dummy_request    *req;
1056
1057 top:
1058         /* if there's no request queued, the device is NAKing; return */
1059         list_for_each_entry (req, &ep->queue, queue) {
1060                 unsigned        host_len, dev_len, len;
1061                 int             is_short, to_host;
1062                 int             rescan = 0;
1063
1064                 /* 1..N packets of ep->ep.maxpacket each ... the last one
1065                  * may be short (including zero length).
1066                  *
1067                  * writer can send a zlp explicitly (length 0) or implicitly
1068                  * (length mod maxpacket zero, and 'zero' flag); they always
1069                  * terminate reads.
1070                  */
1071                 host_len = urb->transfer_buffer_length - urb->actual_length;
1072                 dev_len = req->req.length - req->req.actual;
1073                 len = min (host_len, dev_len);
1074
1075                 /* FIXME update emulated data toggle too */
1076
1077                 to_host = usb_pipein (urb->pipe);
1078                 if (unlikely (len == 0))
1079                         is_short = 1;
1080                 else {
1081                         char            *ubuf, *rbuf;
1082
1083                         /* not enough bandwidth left? */
1084                         if (limit < ep->ep.maxpacket && limit < len)
1085                                 break;
1086                         len = min (len, (unsigned) limit);
1087                         if (len == 0)
1088                                 break;
1089
1090                         /* use an extra pass for the final short packet */
1091                         if (len > ep->ep.maxpacket) {
1092                                 rescan = 1;
1093                                 len -= (len % ep->ep.maxpacket);
1094                         }
1095                         is_short = (len % ep->ep.maxpacket) != 0;
1096
1097                         /* else transfer packet(s) */
1098                         ubuf = urb->transfer_buffer + urb->actual_length;
1099                         rbuf = req->req.buf + req->req.actual;
1100                         if (to_host)
1101                                 memcpy (ubuf, rbuf, len);
1102                         else
1103                                 memcpy (rbuf, ubuf, len);
1104                         ep->last_io = jiffies;
1105
1106                         limit -= len;
1107                         urb->actual_length += len;
1108                         req->req.actual += len;
1109                 }
1110
1111                 /* short packets terminate, maybe with overflow/underflow.
1112                  * it's only really an error to write too much.
1113                  *
1114                  * partially filling a buffer optionally blocks queue advances
1115                  * (so completion handlers can clean up the queue) but we don't
1116                  * need to emulate such data-in-flight.  so we only show part
1117                  * of the URB_SHORT_NOT_OK effect: completion status.
1118                  */
1119                 if (is_short) {
1120                         if (host_len == dev_len) {
1121                                 req->req.status = 0;
1122                                 maybe_set_status (urb, 0);
1123                         } else if (to_host) {
1124                                 req->req.status = 0;
1125                                 if (dev_len > host_len)
1126                                         maybe_set_status (urb, -EOVERFLOW);
1127                                 else
1128                                         maybe_set_status (urb,
1129                                                 (urb->transfer_flags
1130                                                         & URB_SHORT_NOT_OK)
1131                                                 ? -EREMOTEIO : 0);
1132                         } else if (!to_host) {
1133                                 maybe_set_status (urb, 0);
1134                                 if (host_len > dev_len)
1135                                         req->req.status = -EOVERFLOW;
1136                                 else
1137                                         req->req.status = 0;
1138                         }
1139
1140                 /* many requests terminate without a short packet */
1141                 } else {
1142                         if (req->req.length == req->req.actual
1143                                         && !req->req.zero)
1144                                 req->req.status = 0;
1145                         if (urb->transfer_buffer_length == urb->actual_length
1146                                         && !(urb->transfer_flags
1147                                                 & URB_ZERO_PACKET)) {
1148                                 maybe_set_status (urb, 0);
1149                         }
1150                 }
1151
1152                 /* device side completion --> continuable */
1153                 if (req->req.status != -EINPROGRESS) {
1154                         list_del_init (&req->queue);
1155
1156                         spin_unlock (&dum->lock);
1157                         req->req.complete (&ep->ep, &req->req);
1158                         spin_lock (&dum->lock);
1159
1160                         /* requests might have been unlinked... */
1161                         rescan = 1;
1162                 }
1163
1164                 /* host side completion --> terminate */
1165                 if (urb->status != -EINPROGRESS)
1166                         break;
1167
1168                 /* rescan to continue with any other queued i/o */
1169                 if (rescan)
1170                         goto top;
1171         }
1172         return limit;
1173 }
1174
1175 static int periodic_bytes (struct dummy *dum, struct dummy_ep *ep)
1176 {
1177         int     limit = ep->ep.maxpacket;
1178
1179         if (dum->gadget.speed == USB_SPEED_HIGH) {
1180                 int     tmp;
1181
1182                 /* high bandwidth mode */
1183                 tmp = le16_to_cpu(ep->desc->wMaxPacketSize);
1184                 tmp = (tmp >> 11) & 0x03;
1185                 tmp *= 8 /* applies to entire frame */;
1186                 limit += limit * tmp;
1187         }
1188         return limit;
1189 }
1190
1191 #define is_active(dum)  ((dum->port_status & \
1192                 (USB_PORT_STAT_CONNECTION | USB_PORT_STAT_ENABLE | \
1193                         USB_PORT_STAT_SUSPEND)) \
1194                 == (USB_PORT_STAT_CONNECTION | USB_PORT_STAT_ENABLE))
1195
1196 static struct dummy_ep *find_endpoint (struct dummy *dum, u8 address)
1197 {
1198         int             i;
1199
1200         if (!is_active (dum))
1201                 return NULL;
1202         if ((address & ~USB_DIR_IN) == 0)
1203                 return &dum->ep [0];
1204         for (i = 1; i < DUMMY_ENDPOINTS; i++) {
1205                 struct dummy_ep *ep = &dum->ep [i];
1206
1207                 if (!ep->desc)
1208                         continue;
1209                 if (ep->desc->bEndpointAddress == address)
1210                         return ep;
1211         }
1212         return NULL;
1213 }
1214
1215 #undef is_active
1216
1217 #define Dev_Request     (USB_TYPE_STANDARD | USB_RECIP_DEVICE)
1218 #define Dev_InRequest   (Dev_Request | USB_DIR_IN)
1219 #define Intf_Request    (USB_TYPE_STANDARD | USB_RECIP_INTERFACE)
1220 #define Intf_InRequest  (Intf_Request | USB_DIR_IN)
1221 #define Ep_Request      (USB_TYPE_STANDARD | USB_RECIP_ENDPOINT)
1222 #define Ep_InRequest    (Ep_Request | USB_DIR_IN)
1223
1224 /* drive both sides of the transfers; looks like irq handlers to
1225  * both drivers except the callbacks aren't in_irq().
1226  */
1227 static void dummy_timer (unsigned long _dum)
1228 {
1229         struct dummy            *dum = (struct dummy *) _dum;
1230         struct urbp             *urbp, *tmp;
1231         unsigned long           flags;
1232         int                     limit, total;
1233         int                     i;
1234
1235         /* simplistic model for one frame's bandwidth */
1236         switch (dum->gadget.speed) {
1237         case USB_SPEED_LOW:
1238                 total = 8/*bytes*/ * 12/*packets*/;
1239                 break;
1240         case USB_SPEED_FULL:
1241                 total = 64/*bytes*/ * 19/*packets*/;
1242                 break;
1243         case USB_SPEED_HIGH:
1244                 total = 512/*bytes*/ * 13/*packets*/ * 8/*uframes*/;
1245                 break;
1246         default:
1247                 dev_err (dummy_dev(dum), "bogus device speed\n");
1248                 return;
1249         }
1250
1251         /* FIXME if HZ != 1000 this will probably misbehave ... */
1252
1253         /* look at each urb queued by the host side driver */
1254         spin_lock_irqsave (&dum->lock, flags);
1255
1256         if (!dum->udev) {
1257                 dev_err (dummy_dev(dum),
1258                                 "timer fired with no URBs pending?\n");
1259                 spin_unlock_irqrestore (&dum->lock, flags);
1260                 return;
1261         }
1262
1263         for (i = 0; i < DUMMY_ENDPOINTS; i++) {
1264                 if (!ep_name [i])
1265                         break;
1266                 dum->ep [i].already_seen = 0;
1267         }
1268
1269 restart:
1270         list_for_each_entry_safe (urbp, tmp, &dum->urbp_list, urbp_list) {
1271                 struct urb              *urb;
1272                 struct dummy_request    *req;
1273                 u8                      address;
1274                 struct dummy_ep         *ep = NULL;
1275                 int                     type;
1276
1277                 urb = urbp->urb;
1278                 if (urb->status != -EINPROGRESS) {
1279                         /* likely it was just unlinked */
1280                         goto return_urb;
1281                 } else if (dum->rh_state != DUMMY_RH_RUNNING)
1282                         continue;
1283                 type = usb_pipetype (urb->pipe);
1284
1285                 /* used up this frame's non-periodic bandwidth?
1286                  * FIXME there's infinite bandwidth for control and
1287                  * periodic transfers ... unrealistic.
1288                  */
1289                 if (total <= 0 && type == PIPE_BULK)
1290                         continue;
1291
1292                 /* find the gadget's ep for this request (if configured) */
1293                 address = usb_pipeendpoint (urb->pipe);
1294                 if (usb_pipein (urb->pipe))
1295                         address |= USB_DIR_IN;
1296                 ep = find_endpoint(dum, address);
1297                 if (!ep) {
1298                         /* set_configuration() disagreement */
1299                         dev_dbg (dummy_dev(dum),
1300                                 "no ep configured for urb %p\n",
1301                                 urb);
1302                         maybe_set_status (urb, -EPROTO);
1303                         goto return_urb;
1304                 }
1305
1306                 if (ep->already_seen)
1307                         continue;
1308                 ep->already_seen = 1;
1309                 if (ep == &dum->ep [0] && urb->error_count) {
1310                         ep->setup_stage = 1;    /* a new urb */
1311                         urb->error_count = 0;
1312                 }
1313                 if (ep->halted && !ep->setup_stage) {
1314                         /* NOTE: must not be iso! */
1315                         dev_dbg (dummy_dev(dum), "ep %s halted, urb %p\n",
1316                                         ep->ep.name, urb);
1317                         maybe_set_status (urb, -EPIPE);
1318                         goto return_urb;
1319                 }
1320                 /* FIXME make sure both ends agree on maxpacket */
1321
1322                 /* handle control requests */
1323                 if (ep == &dum->ep [0] && ep->setup_stage) {
1324                         struct usb_ctrlrequest          setup;
1325                         int                             value = 1;
1326                         struct dummy_ep                 *ep2;
1327                         unsigned                        w_index;
1328                         unsigned                        w_value;
1329
1330                         setup = *(struct usb_ctrlrequest*) urb->setup_packet;
1331                         w_index = le16_to_cpu(setup.wIndex);
1332                         w_value = le16_to_cpu(setup.wValue);
1333                         if (le16_to_cpu(setup.wLength) !=
1334                                         urb->transfer_buffer_length) {
1335                                 maybe_set_status (urb, -EOVERFLOW);
1336                                 goto return_urb;
1337                         }
1338
1339                         /* paranoia, in case of stale queued data */
1340                         list_for_each_entry (req, &ep->queue, queue) {
1341                                 list_del_init (&req->queue);
1342                                 req->req.status = -EOVERFLOW;
1343                                 dev_dbg (udc_dev(dum), "stale req = %p\n",
1344                                                 req);
1345
1346                                 spin_unlock (&dum->lock);
1347                                 req->req.complete (&ep->ep, &req->req);
1348                                 spin_lock (&dum->lock);
1349                                 ep->already_seen = 0;
1350                                 goto restart;
1351                         }
1352
1353                         /* gadget driver never sees set_address or operations
1354                          * on standard feature flags.  some hardware doesn't
1355                          * even expose them.
1356                          */
1357                         ep->last_io = jiffies;
1358                         ep->setup_stage = 0;
1359                         ep->halted = 0;
1360                         switch (setup.bRequest) {
1361                         case USB_REQ_SET_ADDRESS:
1362                                 if (setup.bRequestType != Dev_Request)
1363                                         break;
1364                                 dum->address = w_value;
1365                                 maybe_set_status (urb, 0);
1366                                 dev_dbg (udc_dev(dum), "set_address = %d\n",
1367                                                 w_value);
1368                                 value = 0;
1369                                 break;
1370                         case USB_REQ_SET_FEATURE:
1371                                 if (setup.bRequestType == Dev_Request) {
1372                                         value = 0;
1373                                         switch (w_value) {
1374                                         case USB_DEVICE_REMOTE_WAKEUP:
1375                                                 break;
1376                                         case USB_DEVICE_B_HNP_ENABLE:
1377                                                 dum->gadget.b_hnp_enable = 1;
1378                                                 break;
1379                                         case USB_DEVICE_A_HNP_SUPPORT:
1380                                                 dum->gadget.a_hnp_support = 1;
1381                                                 break;
1382                                         case USB_DEVICE_A_ALT_HNP_SUPPORT:
1383                                                 dum->gadget.a_alt_hnp_support
1384                                                         = 1;
1385                                                 break;
1386                                         default:
1387                                                 value = -EOPNOTSUPP;
1388                                         }
1389                                         if (value == 0) {
1390                                                 dum->devstatus |=
1391                                                         (1 << w_value);
1392                                                 maybe_set_status (urb, 0);
1393                                         }
1394
1395                                 } else if (setup.bRequestType == Ep_Request) {
1396                                         // endpoint halt
1397                                         ep2 = find_endpoint (dum, w_index);
1398                                         if (!ep2) {
1399                                                 value = -EOPNOTSUPP;
1400                                                 break;
1401                                         }
1402                                         ep2->halted = 1;
1403                                         value = 0;
1404                                         maybe_set_status (urb, 0);
1405                                 }
1406                                 break;
1407                         case USB_REQ_CLEAR_FEATURE:
1408                                 if (setup.bRequestType == Dev_Request) {
1409                                         switch (w_value) {
1410                                         case USB_DEVICE_REMOTE_WAKEUP:
1411                                                 dum->devstatus &= ~(1 <<
1412                                                         USB_DEVICE_REMOTE_WAKEUP);
1413                                                 value = 0;
1414                                                 maybe_set_status (urb, 0);
1415                                                 break;
1416                                         default:
1417                                                 value = -EOPNOTSUPP;
1418                                                 break;
1419                                         }
1420                                 } else if (setup.bRequestType == Ep_Request) {
1421                                         // endpoint halt
1422                                         ep2 = find_endpoint (dum, w_index);
1423                                         if (!ep2) {
1424                                                 value = -EOPNOTSUPP;
1425                                                 break;
1426                                         }
1427                                         ep2->halted = 0;
1428                                         value = 0;
1429                                         maybe_set_status (urb, 0);
1430                                 }
1431                                 break;
1432                         case USB_REQ_GET_STATUS:
1433                                 if (setup.bRequestType == Dev_InRequest
1434                                                 || setup.bRequestType
1435                                                         == Intf_InRequest
1436                                                 || setup.bRequestType
1437                                                         == Ep_InRequest
1438                                                 ) {
1439                                         char *buf;
1440
1441                                         // device: remote wakeup, selfpowered
1442                                         // interface: nothing
1443                                         // endpoint: halt
1444                                         buf = (char *)urb->transfer_buffer;
1445                                         if (urb->transfer_buffer_length > 0) {
1446                                                 if (setup.bRequestType ==
1447                                                                 Ep_InRequest) {
1448         ep2 = find_endpoint (dum, w_index);
1449         if (!ep2) {
1450                 value = -EOPNOTSUPP;
1451                 break;
1452         }
1453         buf [0] = ep2->halted;
1454                                                 } else if (setup.bRequestType ==
1455                                                                 Dev_InRequest) {
1456                                                         buf [0] = (u8)
1457                                                                 dum->devstatus;
1458                                                 } else
1459                                                         buf [0] = 0;
1460                                         }
1461                                         if (urb->transfer_buffer_length > 1)
1462                                                 buf [1] = 0;
1463                                         urb->actual_length = min (2,
1464                                                 urb->transfer_buffer_length);
1465                                         value = 0;
1466                                         maybe_set_status (urb, 0);
1467                                 }
1468                                 break;
1469                         }
1470
1471                         /* gadget driver handles all other requests.  block
1472                          * until setup() returns; no reentrancy issues etc.
1473                          */
1474                         if (value > 0) {
1475                                 spin_unlock (&dum->lock);
1476                                 value = dum->driver->setup (&dum->gadget,
1477                                                 &setup);
1478                                 spin_lock (&dum->lock);
1479
1480                                 if (value >= 0) {
1481                                         /* no delays (max 64KB data stage) */
1482                                         limit = 64*1024;
1483                                         goto treat_control_like_bulk;
1484                                 }
1485                                 /* error, see below */
1486                         }
1487
1488                         if (value < 0) {
1489                                 if (value != -EOPNOTSUPP)
1490                                         dev_dbg (udc_dev(dum),
1491                                                 "setup --> %d\n",
1492                                                 value);
1493                                 maybe_set_status (urb, -EPIPE);
1494                                 urb->actual_length = 0;
1495                         }
1496
1497                         goto return_urb;
1498                 }
1499
1500                 /* non-control requests */
1501                 limit = total;
1502                 switch (usb_pipetype (urb->pipe)) {
1503                 case PIPE_ISOCHRONOUS:
1504                         /* FIXME is it urb->interval since the last xfer?
1505                          * use urb->iso_frame_desc[i].
1506                          * complete whether or not ep has requests queued.
1507                          * report random errors, to debug drivers.
1508                          */
1509                         limit = max (limit, periodic_bytes (dum, ep));
1510                         maybe_set_status (urb, -ENOSYS);
1511                         break;
1512
1513                 case PIPE_INTERRUPT:
1514                         /* FIXME is it urb->interval since the last xfer?
1515                          * this almost certainly polls too fast.
1516                          */
1517                         limit = max (limit, periodic_bytes (dum, ep));
1518                         /* FALLTHROUGH */
1519
1520                 // case PIPE_BULK:  case PIPE_CONTROL:
1521                 default:
1522                 treat_control_like_bulk:
1523                         ep->last_io = jiffies;
1524                         total = transfer (dum, urb, ep, limit);
1525                         break;
1526                 }
1527
1528                 /* incomplete transfer? */
1529                 if (urb->status == -EINPROGRESS)
1530                         continue;
1531
1532 return_urb:
1533                 urb->hcpriv = NULL;
1534                 list_del (&urbp->urbp_list);
1535                 kfree (urbp);
1536                 if (ep)
1537                         ep->already_seen = ep->setup_stage = 0;
1538
1539                 spin_unlock (&dum->lock);
1540                 usb_hcd_giveback_urb (dummy_to_hcd(dum), urb, NULL);
1541                 spin_lock (&dum->lock);
1542
1543                 goto restart;
1544         }
1545
1546         if (list_empty (&dum->urbp_list)) {
1547                 usb_put_dev (dum->udev);
1548                 dum->udev = NULL;
1549         } else if (dum->rh_state == DUMMY_RH_RUNNING) {
1550                 /* want a 1 msec delay here */
1551                 mod_timer (&dum->timer, jiffies + msecs_to_jiffies(1));
1552         }
1553
1554         spin_unlock_irqrestore (&dum->lock, flags);
1555 }
1556
1557 /*-------------------------------------------------------------------------*/
1558
1559 #define PORT_C_MASK \
1560         ((USB_PORT_STAT_C_CONNECTION \
1561         | USB_PORT_STAT_C_ENABLE \
1562         | USB_PORT_STAT_C_SUSPEND \
1563         | USB_PORT_STAT_C_OVERCURRENT \
1564         | USB_PORT_STAT_C_RESET) << 16)
1565
1566 static int dummy_hub_status (struct usb_hcd *hcd, char *buf)
1567 {
1568         struct dummy            *dum;
1569         unsigned long           flags;
1570         int                     retval = 0;
1571
1572         dum = hcd_to_dummy (hcd);
1573
1574         spin_lock_irqsave (&dum->lock, flags);
1575         if (!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags))
1576                 goto done;
1577
1578         if (dum->resuming && time_after_eq (jiffies, dum->re_timeout)) {
1579                 dum->port_status |= (USB_PORT_STAT_C_SUSPEND << 16);
1580                 dum->port_status &= ~USB_PORT_STAT_SUSPEND;
1581                 set_link_state (dum);
1582         }
1583
1584         if ((dum->port_status & PORT_C_MASK) != 0) {
1585                 *buf = (1 << 1);
1586                 dev_dbg (dummy_dev(dum), "port status 0x%08x has changes\n",
1587                                 dum->port_status);
1588                 retval = 1;
1589                 if (dum->rh_state == DUMMY_RH_SUSPENDED)
1590                         usb_hcd_resume_root_hub (hcd);
1591         }
1592 done:
1593         spin_unlock_irqrestore (&dum->lock, flags);
1594         return retval;
1595 }
1596
1597 static inline void
1598 hub_descriptor (struct usb_hub_descriptor *desc)
1599 {
1600         memset (desc, 0, sizeof *desc);
1601         desc->bDescriptorType = 0x29;
1602         desc->bDescLength = 9;
1603         desc->wHubCharacteristics = (__force __u16)
1604                         (__constant_cpu_to_le16 (0x0001));
1605         desc->bNbrPorts = 1;
1606         desc->bitmap [0] = 0xff;
1607         desc->bitmap [1] = 0xff;
1608 }
1609
1610 static int dummy_hub_control (
1611         struct usb_hcd  *hcd,
1612         u16             typeReq,
1613         u16             wValue,
1614         u16             wIndex,
1615         char            *buf,
1616         u16             wLength
1617 ) {
1618         struct dummy    *dum;
1619         int             retval = 0;
1620         unsigned long   flags;
1621
1622         if (!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags))
1623                 return -ETIMEDOUT;
1624
1625         dum = hcd_to_dummy (hcd);
1626         spin_lock_irqsave (&dum->lock, flags);
1627         switch (typeReq) {
1628         case ClearHubFeature:
1629                 break;
1630         case ClearPortFeature:
1631                 switch (wValue) {
1632                 case USB_PORT_FEAT_SUSPEND:
1633                         if (dum->port_status & USB_PORT_STAT_SUSPEND) {
1634                                 /* 20msec resume signaling */
1635                                 dum->resuming = 1;
1636                                 dum->re_timeout = jiffies +
1637                                                 msecs_to_jiffies(20);
1638                         }
1639                         break;
1640                 case USB_PORT_FEAT_POWER:
1641                         if (dum->port_status & USB_PORT_STAT_POWER)
1642                                 dev_dbg (dummy_dev(dum), "power-off\n");
1643                         /* FALLS THROUGH */
1644                 default:
1645                         dum->port_status &= ~(1 << wValue);
1646                         set_link_state (dum);
1647                 }
1648                 break;
1649         case GetHubDescriptor:
1650                 hub_descriptor ((struct usb_hub_descriptor *) buf);
1651                 break;
1652         case GetHubStatus:
1653                 *(__le32 *) buf = __constant_cpu_to_le32 (0);
1654                 break;
1655         case GetPortStatus:
1656                 if (wIndex != 1)
1657                         retval = -EPIPE;
1658
1659                 /* whoever resets or resumes must GetPortStatus to
1660                  * complete it!!
1661                  */
1662                 if (dum->resuming &&
1663                                 time_after_eq (jiffies, dum->re_timeout)) {
1664                         dum->port_status |= (USB_PORT_STAT_C_SUSPEND << 16);
1665                         dum->port_status &= ~USB_PORT_STAT_SUSPEND;
1666                 }
1667                 if ((dum->port_status & USB_PORT_STAT_RESET) != 0 &&
1668                                 time_after_eq (jiffies, dum->re_timeout)) {
1669                         dum->port_status |= (USB_PORT_STAT_C_RESET << 16);
1670                         dum->port_status &= ~USB_PORT_STAT_RESET;
1671                         if (dum->pullup) {
1672                                 dum->port_status |= USB_PORT_STAT_ENABLE;
1673                                 /* give it the best speed we agree on */
1674                                 dum->gadget.speed = dum->driver->speed;
1675                                 dum->gadget.ep0->maxpacket = 64;
1676                                 switch (dum->gadget.speed) {
1677                                 case USB_SPEED_HIGH:
1678                                         dum->port_status |=
1679                                                 USB_PORT_STAT_HIGH_SPEED;
1680                                         break;
1681                                 case USB_SPEED_LOW:
1682                                         dum->gadget.ep0->maxpacket = 8;
1683                                         dum->port_status |=
1684                                                 USB_PORT_STAT_LOW_SPEED;
1685                                         break;
1686                                 default:
1687                                         dum->gadget.speed = USB_SPEED_FULL;
1688                                         break;
1689                                 }
1690                         }
1691                 }
1692                 set_link_state (dum);
1693                 ((__le16 *) buf)[0] = cpu_to_le16 (dum->port_status);
1694                 ((__le16 *) buf)[1] = cpu_to_le16 (dum->port_status >> 16);
1695                 break;
1696         case SetHubFeature:
1697                 retval = -EPIPE;
1698                 break;
1699         case SetPortFeature:
1700                 switch (wValue) {
1701                 case USB_PORT_FEAT_SUSPEND:
1702                         if (dum->active) {
1703                                 dum->port_status |= USB_PORT_STAT_SUSPEND;
1704
1705                                 /* HNP would happen here; for now we
1706                                  * assume b_bus_req is always true.
1707                                  */
1708                                 set_link_state (dum);
1709                                 if (((1 << USB_DEVICE_B_HNP_ENABLE)
1710                                                 & dum->devstatus) != 0)
1711                                         dev_dbg (dummy_dev(dum),
1712                                                         "no HNP yet!\n");
1713                         }
1714                         break;
1715                 case USB_PORT_FEAT_POWER:
1716                         dum->port_status |= USB_PORT_STAT_POWER;
1717                         set_link_state (dum);
1718                         break;
1719                 case USB_PORT_FEAT_RESET:
1720                         /* if it's already enabled, disable */
1721                         dum->port_status &= ~(USB_PORT_STAT_ENABLE
1722                                         | USB_PORT_STAT_LOW_SPEED
1723                                         | USB_PORT_STAT_HIGH_SPEED);
1724                         dum->devstatus = 0;
1725                         /* 50msec reset signaling */
1726                         dum->re_timeout = jiffies + msecs_to_jiffies(50);
1727                         /* FALLS THROUGH */
1728                 default:
1729                         if ((dum->port_status & USB_PORT_STAT_POWER) != 0) {
1730                                 dum->port_status |= (1 << wValue);
1731                                 set_link_state (dum);
1732                         }
1733                 }
1734                 break;
1735
1736         default:
1737                 dev_dbg (dummy_dev(dum),
1738                         "hub control req%04x v%04x i%04x l%d\n",
1739                         typeReq, wValue, wIndex, wLength);
1740
1741                 /* "protocol stall" on error */
1742                 retval = -EPIPE;
1743         }
1744         spin_unlock_irqrestore (&dum->lock, flags);
1745
1746         if ((dum->port_status & PORT_C_MASK) != 0)
1747                 usb_hcd_poll_rh_status (hcd);
1748         return retval;
1749 }
1750
1751 static int dummy_bus_suspend (struct usb_hcd *hcd)
1752 {
1753         struct dummy *dum = hcd_to_dummy (hcd);
1754
1755         dev_dbg (&hcd->self.root_hub->dev, "%s\n", __FUNCTION__);
1756
1757         spin_lock_irq (&dum->lock);
1758         dum->rh_state = DUMMY_RH_SUSPENDED;
1759         set_link_state (dum);
1760         hcd->state = HC_STATE_SUSPENDED;
1761         spin_unlock_irq (&dum->lock);
1762         return 0;
1763 }
1764
1765 static int dummy_bus_resume (struct usb_hcd *hcd)
1766 {
1767         struct dummy *dum = hcd_to_dummy (hcd);
1768         int rc = 0;
1769
1770         dev_dbg (&hcd->self.root_hub->dev, "%s\n", __FUNCTION__);
1771
1772         spin_lock_irq (&dum->lock);
1773         if (!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags)) {
1774                 dev_warn (&hcd->self.root_hub->dev, "HC isn't running!\n");
1775                 rc = -ENODEV;
1776         } else {
1777                 dum->rh_state = DUMMY_RH_RUNNING;
1778                 set_link_state (dum);
1779                 if (!list_empty(&dum->urbp_list))
1780                         mod_timer (&dum->timer, jiffies);
1781                 hcd->state = HC_STATE_RUNNING;
1782         }
1783         spin_unlock_irq (&dum->lock);
1784         return rc;
1785 }
1786
1787 /*-------------------------------------------------------------------------*/
1788
1789 static inline ssize_t
1790 show_urb (char *buf, size_t size, struct urb *urb)
1791 {
1792         int ep = usb_pipeendpoint (urb->pipe);
1793
1794         return snprintf (buf, size,
1795                 "urb/%p %s ep%d%s%s len %d/%d\n",
1796                 urb,
1797                 ({ char *s;
1798                  switch (urb->dev->speed) {
1799                  case USB_SPEED_LOW:    s = "ls"; break;
1800                  case USB_SPEED_FULL:   s = "fs"; break;
1801                  case USB_SPEED_HIGH:   s = "hs"; break;
1802                  default:               s = "?"; break;
1803                  }; s; }),
1804                 ep, ep ? (usb_pipein (urb->pipe) ? "in" : "out") : "",
1805                 ({ char *s; \
1806                  switch (usb_pipetype (urb->pipe)) { \
1807                  case PIPE_CONTROL:     s = ""; break; \
1808                  case PIPE_BULK:        s = "-bulk"; break; \
1809                  case PIPE_INTERRUPT:   s = "-int"; break; \
1810                  default:               s = "-iso"; break; \
1811                 }; s;}),
1812                 urb->actual_length, urb->transfer_buffer_length);
1813 }
1814
1815 static ssize_t
1816 show_urbs (struct device *dev, struct device_attribute *attr, char *buf)
1817 {
1818         struct usb_hcd          *hcd = dev_get_drvdata (dev);
1819         struct dummy            *dum = hcd_to_dummy (hcd);
1820         struct urbp             *urbp;
1821         size_t                  size = 0;
1822         unsigned long           flags;
1823
1824         spin_lock_irqsave (&dum->lock, flags);
1825         list_for_each_entry (urbp, &dum->urbp_list, urbp_list) {
1826                 size_t          temp;
1827
1828                 temp = show_urb (buf, PAGE_SIZE - size, urbp->urb);
1829                 buf += temp;
1830                 size += temp;
1831         }
1832         spin_unlock_irqrestore (&dum->lock, flags);
1833
1834         return size;
1835 }
1836 static DEVICE_ATTR (urbs, S_IRUGO, show_urbs, NULL);
1837
1838 static int dummy_start (struct usb_hcd *hcd)
1839 {
1840         struct dummy            *dum;
1841
1842         dum = hcd_to_dummy (hcd);
1843
1844         /*
1845          * MASTER side init ... we emulate a root hub that'll only ever
1846          * talk to one device (the slave side).  Also appears in sysfs,
1847          * just like more familiar pci-based HCDs.
1848          */
1849         spin_lock_init (&dum->lock);
1850         init_timer (&dum->timer);
1851         dum->timer.function = dummy_timer;
1852         dum->timer.data = (unsigned long) dum;
1853         dum->rh_state = DUMMY_RH_RUNNING;
1854
1855         INIT_LIST_HEAD (&dum->urbp_list);
1856
1857         /* only show a low-power port: just 8mA */
1858         hcd->power_budget = 8;
1859         hcd->state = HC_STATE_RUNNING;
1860         hcd->uses_new_polling = 1;
1861
1862 #ifdef CONFIG_USB_OTG
1863         hcd->self.otg_port = 1;
1864 #endif
1865
1866         /* FIXME 'urbs' should be a per-device thing, maybe in usbcore */
1867         device_create_file (dummy_dev(dum), &dev_attr_urbs);
1868         return 0;
1869 }
1870
1871 static void dummy_stop (struct usb_hcd *hcd)
1872 {
1873         struct dummy            *dum;
1874
1875         dum = hcd_to_dummy (hcd);
1876
1877         device_remove_file (dummy_dev(dum), &dev_attr_urbs);
1878         usb_gadget_unregister_driver (dum->driver);
1879         dev_info (dummy_dev(dum), "stopped\n");
1880 }
1881
1882 /*-------------------------------------------------------------------------*/
1883
1884 static int dummy_h_get_frame (struct usb_hcd *hcd)
1885 {
1886         return dummy_g_get_frame (NULL);
1887 }
1888
1889 static const struct hc_driver dummy_hcd = {
1890         .description =          (char *) driver_name,
1891         .product_desc =         "Dummy host controller",
1892         .hcd_priv_size =        sizeof(struct dummy),
1893
1894         .flags =                HCD_USB2,
1895
1896         .start =                dummy_start,
1897         .stop =                 dummy_stop,
1898
1899         .urb_enqueue =          dummy_urb_enqueue,
1900         .urb_dequeue =          dummy_urb_dequeue,
1901
1902         .get_frame_number =     dummy_h_get_frame,
1903
1904         .hub_status_data =      dummy_hub_status,
1905         .hub_control =          dummy_hub_control,
1906         .bus_suspend =          dummy_bus_suspend,
1907         .bus_resume =           dummy_bus_resume,
1908 };
1909
1910 static int dummy_hcd_probe(struct platform_device *pdev)
1911 {
1912         struct usb_hcd          *hcd;
1913         int                     retval;
1914
1915         dev_info(&pdev->dev, "%s, driver " DRIVER_VERSION "\n", driver_desc);
1916
1917         hcd = usb_create_hcd(&dummy_hcd, &pdev->dev, pdev->dev.bus_id);
1918         if (!hcd)
1919                 return -ENOMEM;
1920         the_controller = hcd_to_dummy (hcd);
1921
1922         retval = usb_add_hcd(hcd, 0, 0);
1923         if (retval != 0) {
1924                 usb_put_hcd (hcd);
1925                 the_controller = NULL;
1926         }
1927         return retval;
1928 }
1929
1930 static int dummy_hcd_remove (struct platform_device *pdev)
1931 {
1932         struct usb_hcd          *hcd;
1933
1934         hcd = platform_get_drvdata (pdev);
1935         usb_remove_hcd (hcd);
1936         usb_put_hcd (hcd);
1937         the_controller = NULL;
1938         return 0;
1939 }
1940
1941 static int dummy_hcd_suspend (struct platform_device *pdev, pm_message_t state)
1942 {
1943         struct usb_hcd          *hcd;
1944         struct dummy            *dum;
1945         int                     rc = 0;
1946
1947         dev_dbg (&pdev->dev, "%s\n", __FUNCTION__);
1948
1949         hcd = platform_get_drvdata (pdev);
1950         dum = hcd_to_dummy (hcd);
1951         if (dum->rh_state == DUMMY_RH_RUNNING) {
1952                 dev_warn(&pdev->dev, "Root hub isn't suspended!\n");
1953                 rc = -EBUSY;
1954         } else
1955                 clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
1956         return rc;
1957 }
1958
1959 static int dummy_hcd_resume (struct platform_device *pdev)
1960 {
1961         struct usb_hcd          *hcd;
1962
1963         dev_dbg (&pdev->dev, "%s\n", __FUNCTION__);
1964
1965         hcd = platform_get_drvdata (pdev);
1966         set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
1967         usb_hcd_poll_rh_status (hcd);
1968         return 0;
1969 }
1970
1971 static struct platform_driver dummy_hcd_driver = {
1972         .probe          = dummy_hcd_probe,
1973         .remove         = dummy_hcd_remove,
1974         .suspend        = dummy_hcd_suspend,
1975         .resume         = dummy_hcd_resume,
1976         .driver         = {
1977                 .name   = (char *) driver_name,
1978                 .owner  = THIS_MODULE,
1979         },
1980 };
1981
1982 /*-------------------------------------------------------------------------*/
1983
1984 /* These don't need to do anything because the pdev structures are
1985  * statically allocated. */
1986 static void
1987 dummy_udc_release (struct device *dev) {}
1988
1989 static void
1990 dummy_hcd_release (struct device *dev) {}
1991
1992 static struct platform_device           the_udc_pdev = {
1993         .name           = (char *) gadget_name,
1994         .id             = -1,
1995         .dev            = {
1996                 .release        = dummy_udc_release,
1997         },
1998 };
1999
2000 static struct platform_device           the_hcd_pdev = {
2001         .name           = (char *) driver_name,
2002         .id             = -1,
2003         .dev            = {
2004                 .release        = dummy_hcd_release,
2005         },
2006 };
2007
2008 static int __init init (void)
2009 {
2010         int     retval;
2011
2012         if (usb_disabled ())
2013                 return -ENODEV;
2014
2015         retval = platform_driver_register (&dummy_hcd_driver);
2016         if (retval < 0)
2017                 return retval;
2018
2019         retval = platform_driver_register (&dummy_udc_driver);
2020         if (retval < 0)
2021                 goto err_register_udc_driver;
2022
2023         retval = platform_device_register (&the_hcd_pdev);
2024         if (retval < 0)
2025                 goto err_register_hcd;
2026
2027         retval = platform_device_register (&the_udc_pdev);
2028         if (retval < 0)
2029                 goto err_register_udc;
2030         return retval;
2031
2032 err_register_udc:
2033         platform_device_unregister (&the_hcd_pdev);
2034 err_register_hcd:
2035         platform_driver_unregister (&dummy_udc_driver);
2036 err_register_udc_driver:
2037         platform_driver_unregister (&dummy_hcd_driver);
2038         return retval;
2039 }
2040 module_init (init);
2041
2042 static void __exit cleanup (void)
2043 {
2044         platform_device_unregister (&the_udc_pdev);
2045         platform_device_unregister (&the_hcd_pdev);
2046         platform_driver_unregister (&dummy_udc_driver);
2047         platform_driver_unregister (&dummy_hcd_driver);
2048 }
2049 module_exit (cleanup);