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         spin_lock_irqsave (&dum->lock, flags);
 613         list_for_each_entry (req, &ep->queue, queue) {
 614                 if (&req->req == _req) {
 615                         list_del_init (&req->queue);
 616                         _req->status = -ECONNRESET;
 617                         retval = 0;
 618                         break;
 619                 }
 620         }
 621         spin_unlock_irqrestore (&dum->lock, flags);
 622
 623         if (retval == 0) {
 624                 dev_dbg (udc_dev(dum),
 625                                 "dequeued req %p from %s, len %d buf %p\n",
 626                                 req, _ep->name, _req->length, _req->buf);
 627                 _req->complete (_ep, _req);
 628         }
 629         return retval;
 630 }
 631
 632 static int
 633 dummy_set_halt (struct usb_ep *_ep, int value)
 634 {
 635         struct dummy_ep         *ep;
 636         struct dummy            *dum;
 637
 638         if (!_ep)
 639                 return -EINVAL;
 640         ep = usb_ep_to_dummy_ep (_ep);
 641         dum = ep_to_dummy (ep);
 642         if (!dum->driver)
 643                 return -ESHUTDOWN;
 644         if (!value)
 645                 ep->halted = 0;
 646         else if (ep->desc && (ep->desc->bEndpointAddress & USB_DIR_IN) &&
 647                         !list_empty (&ep->queue))
 648                 return -EAGAIN;
 649         else
 650                 ep->halted = 1;
 651         /* FIXME clear emulated data toggle too */
 652         return 0;
 653 }
 654
 655 static const struct usb_ep_ops dummy_ep_ops = {
 656         .enable         = dummy_enable,
 657         .disable        = dummy_disable,
 658
 659         .alloc_request  = dummy_alloc_request,
 660         .free_request   = dummy_free_request,
 661
 662         .alloc_buffer   = dummy_alloc_buffer,
 663         .free_buffer    = dummy_free_buffer,
 664         /* map, unmap, ... eventually hook the "generic" dma calls */
 665
 666         .queue          = dummy_queue,
 667         .dequeue        = dummy_dequeue,
 668
 669         .set_halt       = dummy_set_halt,
 670 };
 671
 672 /*-------------------------------------------------------------------------*/
 673
 674 /* there are both host and device side versions of this call ... */
 675 static int dummy_g_get_frame (struct usb_gadget *_gadget)
 676 {
 677         struct timeval  tv;
 678
 679         do_gettimeofday (&tv);
 680         return tv.tv_usec / 1000;
 681 }
 682
 683 static int dummy_wakeup (struct usb_gadget *_gadget)
 684 {
 685         struct dummy    *dum;
 686
 687         dum = gadget_to_dummy (_gadget);
 688         if (!(dum->devstatus &  ( (1 << USB_DEVICE_B_HNP_ENABLE)
 689                                 | (1 << USB_DEVICE_REMOTE_WAKEUP))))
 690                 return -EINVAL;
 691         if ((dum->port_status & USB_PORT_STAT_CONNECTION) == 0)
 692                 return -ENOLINK;
 693         if ((dum->port_status & USB_PORT_STAT_SUSPEND) == 0 &&
 694                          dum->rh_state != DUMMY_RH_SUSPENDED)
 695                 return -EIO;
 696
 697         /* FIXME: What if the root hub is suspended but the port isn't? */
 698
 699         /* hub notices our request, issues downstream resume, etc */
 700         dum->resuming = 1;
 701         dum->re_timeout = jiffies + msecs_to_jiffies(20);
 702         mod_timer (&dummy_to_hcd (dum)->rh_timer, dum->re_timeout);
 703         return 0;
 704 }
 705
 706 static int dummy_set_selfpowered (struct usb_gadget *_gadget, int value)
 707 {
 708         struct dummy    *dum;
 709
 710         dum = gadget_to_dummy (_gadget);
 711         if (value)
 712                 dum->devstatus |= (1 << USB_DEVICE_SELF_POWERED);
 713         else
 714                 dum->devstatus &= ~(1 << USB_DEVICE_SELF_POWERED);
 715         return 0;
 716 }
 717
 718 static int dummy_pullup (struct usb_gadget *_gadget, int value)
 719 {
 720         struct dummy    *dum;
 721         unsigned long   flags;
 722
 723         dum = gadget_to_dummy (_gadget);
 724         spin_lock_irqsave (&dum->lock, flags);
 725         dum->pullup = (value != 0);
 726         set_link_state (dum);
 727         spin_unlock_irqrestore (&dum->lock, flags);
 728
 729         usb_hcd_poll_rh_status (dummy_to_hcd (dum));
 730         return 0;
 731 }
 732
 733 static const struct usb_gadget_ops dummy_ops = {
 734         .get_frame      = dummy_g_get_frame,
 735         .wakeup         = dummy_wakeup,
 736         .set_selfpowered = dummy_set_selfpowered,
 737         .pullup         = dummy_pullup,
 738 };
 739
 740 /*-------------------------------------------------------------------------*/
 741
 742 /* "function" sysfs attribute */
 743 static ssize_t
 744 show_function (struct device *dev, struct device_attribute *attr, char *buf)
 745 {
 746         struct dummy    *dum = gadget_dev_to_dummy (dev);
 747
 748         if (!dum->driver || !dum->driver->function)
 749                 return 0;
 750         return scnprintf (buf, PAGE_SIZE, "%s\n", dum->driver->function);
 751 }
 752 static DEVICE_ATTR (function, S_IRUGO, show_function, NULL);
 753
 754 /*-------------------------------------------------------------------------*/
 755
 756 /*
 757  * Driver registration/unregistration.
 758  *
 759  * This is basically hardware-specific; there's usually only one real USB
 760  * device (not host) controller since that's how USB devices are intended
 761  * to work.  So most implementations of these api calls will rely on the
 762  * fact that only one driver will ever bind to the hardware.  But curious
 763  * hardware can be built with discrete components, so the gadget API doesn't
 764  * require that assumption.
 765  *
 766  * For this emulator, it might be convenient to create a usb slave device
 767  * for each driver that registers:  just add to a big root hub.
 768  */
 769
 770 int
 771 usb_gadget_register_driver (struct usb_gadget_driver *driver)
 772 {
 773         struct dummy    *dum = the_controller;
 774         int             retval, i;
 775
 776         if (!dum)
 777                 return -EINVAL;
 778         if (dum->driver)
 779                 return -EBUSY;
 780         if (!driver->bind || !driver->unbind || !driver->setup
 781                         || driver->speed == USB_SPEED_UNKNOWN)
 782                 return -EINVAL;
 783
 784         /*
 785          * SLAVE side init ... the layer above hardware, which
 786          * can't enumerate without help from the driver we're binding.
 787          */
 788
 789         dum->devstatus = 0;
 790
 791         INIT_LIST_HEAD (&dum->gadget.ep_list);
 792         for (i = 0; i < DUMMY_ENDPOINTS; i++) {
 793                 struct dummy_ep *ep = &dum->ep [i];
 794
 795                 if (!ep_name [i])
 796                         break;
 797                 ep->ep.name = ep_name [i];
 798                 ep->ep.ops = &dummy_ep_ops;
 799                 list_add_tail (&ep->ep.ep_list, &dum->gadget.ep_list);
 800                 ep->halted = ep->already_seen = ep->setup_stage = 0;
 801                 ep->ep.maxpacket = ~0;
 802                 ep->last_io = jiffies;
 803                 ep->gadget = &dum->gadget;
 804                 ep->desc = NULL;
 805                 INIT_LIST_HEAD (&ep->queue);
 806         }
 807
 808         dum->gadget.ep0 = &dum->ep [0].ep;
 809         dum->ep [0].ep.maxpacket = 64;
 810         list_del_init (&dum->ep [0].ep.ep_list);
 811         INIT_LIST_HEAD(&dum->fifo_req.queue);
 812
 813         dum->driver = driver;
 814         dum->gadget.dev.driver = &driver->driver;
 815         dev_dbg (udc_dev(dum), "binding gadget driver '%s'\n",
 816                         driver->driver.name);
 817         if ((retval = driver->bind (&dum->gadget)) != 0) {
 818                 dum->driver = NULL;
 819                 dum->gadget.dev.driver = NULL;
 820                 return retval;
 821         }
 822
 823         driver->driver.bus = dum->gadget.dev.parent->bus;
 824         driver_register (&driver->driver);
 825         device_bind_driver (&dum->gadget.dev);
 826
 827         /* khubd will enumerate this in a while */
 828         spin_lock_irq (&dum->lock);
 829         dum->pullup = 1;
 830         set_link_state (dum);
 831         spin_unlock_irq (&dum->lock);
 832
 833         usb_hcd_poll_rh_status (dummy_to_hcd (dum));
 834         return 0;
 835 }
 836 EXPORT_SYMBOL (usb_gadget_register_driver);
 837
 838 int
 839 usb_gadget_unregister_driver (struct usb_gadget_driver *driver)
 840 {
 841         struct dummy    *dum = the_controller;
 842         unsigned long   flags;
 843
 844         if (!dum)
 845                 return -ENODEV;
 846         if (!driver || driver != dum->driver)
 847                 return -EINVAL;
 848
 849         dev_dbg (udc_dev(dum), "unregister gadget driver '%s'\n",
 850                         driver->driver.name);
 851
 852         spin_lock_irqsave (&dum->lock, flags);
 853         dum->pullup = 0;
 854         set_link_state (dum);
 855         spin_unlock_irqrestore (&dum->lock, flags);
 856
 857         driver->unbind (&dum->gadget);
 858         dum->driver = NULL;
 859
 860         device_release_driver (&dum->gadget.dev);
 861         driver_unregister (&driver->driver);
 862
 863         spin_lock_irqsave (&dum->lock, flags);
 864         dum->pullup = 0;
 865         set_link_state (dum);
 866         spin_unlock_irqrestore (&dum->lock, flags);
 867
 868         usb_hcd_poll_rh_status (dummy_to_hcd (dum));
 869         return 0;
 870 }
 871 EXPORT_SYMBOL (usb_gadget_unregister_driver);
 872
 873 #undef is_enabled
 874
 875 /* just declare this in any driver that really need it */
 876 extern int net2280_set_fifo_mode (struct usb_gadget *gadget, int mode);
 877
 878 int net2280_set_fifo_mode (struct usb_gadget *gadget, int mode)
 879 {
 880         return -ENOSYS;
 881 }
 882 EXPORT_SYMBOL (net2280_set_fifo_mode);
 883
 884
 885 /* The gadget structure is stored inside the hcd structure and will be
 886  * released along with it. */
 887 static void
 888 dummy_gadget_release (struct device *dev)
 889 {
 890 #if 0           /* usb_bus_put isn't EXPORTed! */
 891         struct dummy    *dum = gadget_dev_to_dummy (dev);
 892
 893         usb_bus_put (&dummy_to_hcd (dum)->self);
 894 #endif
 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 #if 0           /* usb_bus_get isn't EXPORTed! */
 917         usb_bus_get (&dummy_to_hcd (dum)->self);
 918 #endif
 919
 920         platform_set_drvdata (pdev, dum);
 921         device_create_file (&dum->gadget.dev, &dev_attr_function);
 922         return rc;
 923 }
 924
 925 static int dummy_udc_remove (struct platform_device *pdev)
 926 {
 927         struct dummy    *dum = platform_get_drvdata (pdev);
 928
 929         platform_set_drvdata (pdev, NULL);
 930         device_remove_file (&dum->gadget.dev, &dev_attr_function);
 931         device_unregister (&dum->gadget.dev);
 932         return 0;
 933 }
 934
 935 static int dummy_udc_suspend (struct platform_device *pdev, pm_message_t state)
 936 {
 937         struct dummy    *dum = platform_get_drvdata(pdev);
 938
 939         dev_dbg (&pdev->dev, "%s\n", __FUNCTION__);
 940         spin_lock_irq (&dum->lock);
 941         dum->udc_suspended = 1;
 942         set_link_state (dum);
 943         spin_unlock_irq (&dum->lock);
 944
 945         pdev->dev.power.power_state = state;
 946         usb_hcd_poll_rh_status (dummy_to_hcd (dum));
 947         return 0;
 948 }
 949
 950 static int dummy_udc_resume (struct platform_device *pdev)
 951 {
 952         struct dummy    *dum = platform_get_drvdata(pdev);
 953
 954         dev_dbg (&pdev->dev, "%s\n", __FUNCTION__);
 955         spin_lock_irq (&dum->lock);
 956         dum->udc_suspended = 0;
 957         set_link_state (dum);
 958         spin_unlock_irq (&dum->lock);
 959
 960         pdev->dev.power.power_state = PMSG_ON;
 961         usb_hcd_poll_rh_status (dummy_to_hcd (dum));
 962         return 0;
 963 }
 964
 965 static struct platform_driver dummy_udc_driver = {
 966         .probe          = dummy_udc_probe,
 967         .remove         = dummy_udc_remove,
 968         .suspend        = dummy_udc_suspend,
 969         .resume         = dummy_udc_resume,
 970         .driver         = {
 971                 .name   = (char *) gadget_name,
 972                 .owner  = THIS_MODULE,
 973         },
 974 };
 975
 976 /*-------------------------------------------------------------------------*/
 977
 978 /* MASTER/HOST SIDE DRIVER
 979  *
 980  * this uses the hcd framework to hook up to host side drivers.
 981  * its root hub will only have one device, otherwise it acts like
 982  * a normal host controller.
 983  *
 984  * when urbs are queued, they're just stuck on a list that we
 985  * scan in a timer callback.  that callback connects writes from
 986  * the host with reads from the device, and so on, based on the
 987  * usb 2.0 rules.
 988  */
 989
 990 static int dummy_urb_enqueue (
 991         struct usb_hcd                  *hcd,
 992         struct usb_host_endpoint        *ep,
 993         struct urb                      *urb,
 994         gfp_t                           mem_flags
 995 ) {
 996         struct dummy    *dum;
 997         struct urbp     *urbp;
 998         unsigned long   flags;
 999
1000         if (!urb->transfer_buffer && urb->transfer_buffer_length)
1001                 return -EINVAL;
1002
1003         urbp = kmalloc (sizeof *urbp, mem_flags);
1004         if (!urbp)
1005                 return -ENOMEM;
1006         urbp->urb = urb;
1007
1008         dum = hcd_to_dummy (hcd);
1009         spin_lock_irqsave (&dum->lock, flags);
1010
1011         if (!dum->udev) {
1012                 dum->udev = urb->dev;
1013                 usb_get_dev (dum->udev);
1014         } else if (unlikely (dum->udev != urb->dev))
1015                 dev_err (dummy_dev(dum), "usb_device address has changed!\n");
1016
1017         list_add_tail (&urbp->urbp_list, &dum->urbp_list);
1018         urb->hcpriv = urbp;
1019         if (usb_pipetype (urb->pipe) == PIPE_CONTROL)
1020                 urb->error_count = 1;           /* mark as a new urb */
1021
1022         /* kick the scheduler, it'll do the rest */
1023         if (!timer_pending (&dum->timer))
1024                 mod_timer (&dum->timer, jiffies + 1);
1025
1026         spin_unlock_irqrestore (&dum->lock, flags);
1027         return 0;
1028 }
1029
1030 static int dummy_urb_dequeue (struct usb_hcd *hcd, struct urb *urb)
1031 {
1032         struct dummy    *dum;
1033         unsigned long   flags;
1034
1035         /* giveback happens automatically in timer callback,
1036          * so make sure the callback happens */
1037         dum = hcd_to_dummy (hcd);
1038         spin_lock_irqsave (&dum->lock, flags);
1039         if (dum->rh_state != DUMMY_RH_RUNNING && !list_empty(&dum->urbp_list))
1040                 mod_timer (&dum->timer, jiffies);
1041         spin_unlock_irqrestore (&dum->lock, flags);
1042         return 0;
1043 }
1044
1045 static void maybe_set_status (struct urb *urb, int status)
1046 {
1047         spin_lock (&urb->lock);
1048         if (urb->status == -EINPROGRESS)
1049                 urb->status = status;
1050         spin_unlock (&urb->lock);
1051 }
1052
1053 /* transfer up to a frame's worth; caller must own lock */
1054 static int
1055 transfer (struct dummy *dum, struct urb *urb, struct dummy_ep *ep, int limit)
1056 {
1057         struct dummy_request    *req;
1058
1059 top:
1060         /* if there's no request queued, the device is NAKing; return */
1061         list_for_each_entry (req, &ep->queue, queue) {
1062                 unsigned        host_len, dev_len, len;
1063                 int             is_short, to_host;
1064                 int             rescan = 0;
1065
1066                 /* 1..N packets of ep->ep.maxpacket each ... the last one
1067                  * may be short (including zero length).
1068                  *
1069                  * writer can send a zlp explicitly (length 0) or implicitly
1070                  * (length mod maxpacket zero, and 'zero' flag); they always
1071                  * terminate reads.
1072                  */
1073                 host_len = urb->transfer_buffer_length - urb->actual_length;
1074                 dev_len = req->req.length - req->req.actual;
1075                 len = min (host_len, dev_len);
1076
1077                 /* FIXME update emulated data toggle too */
1078
1079                 to_host = usb_pipein (urb->pipe);
1080                 if (unlikely (len == 0))
1081                         is_short = 1;
1082                 else {
1083                         char            *ubuf, *rbuf;
1084
1085                         /* not enough bandwidth left? */
1086                         if (limit < ep->ep.maxpacket && limit < len)
1087                                 break;
1088                         len = min (len, (unsigned) limit);
1089                         if (len == 0)
1090                                 break;
1091
1092                         /* use an extra pass for the final short packet */
1093                         if (len > ep->ep.maxpacket) {
1094                                 rescan = 1;
1095                                 len -= (len % ep->ep.maxpacket);
1096                         }
1097                         is_short = (len % ep->ep.maxpacket) != 0;
1098
1099                         /* else transfer packet(s) */
1100                         ubuf = urb->transfer_buffer + urb->actual_length;
1101                         rbuf = req->req.buf + req->req.actual;
1102                         if (to_host)
1103                                 memcpy (ubuf, rbuf, len);
1104                         else
1105                                 memcpy (rbuf, ubuf, len);
1106                         ep->last_io = jiffies;
1107
1108                         limit -= len;
1109                         urb->actual_length += len;
1110                         req->req.actual += len;
1111                 }
1112
1113                 /* short packets terminate, maybe with overflow/underflow.
1114                  * it's only really an error to write too much.
1115                  *
1116                  * partially filling a buffer optionally blocks queue advances
1117                  * (so completion handlers can clean up the queue) but we don't
1118                  * need to emulate such data-in-flight.  so we only show part
1119                  * of the URB_SHORT_NOT_OK effect: completion status.
1120                  */
1121                 if (is_short) {
1122                         if (host_len == dev_len) {
1123                                 req->req.status = 0;
1124                                 maybe_set_status (urb, 0);
1125                         } else if (to_host) {
1126                                 req->req.status = 0;
1127                                 if (dev_len > host_len)
1128                                         maybe_set_status (urb, -EOVERFLOW);
1129                                 else
1130                                         maybe_set_status (urb,
1131                                                 (urb->transfer_flags
1132                                                         & URB_SHORT_NOT_OK)
1133                                                 ? -EREMOTEIO : 0);
1134                         } else if (!to_host) {
1135                                 maybe_set_status (urb, 0);
1136                                 if (host_len > dev_len)
1137                                         req->req.status = -EOVERFLOW;
1138                                 else
1139                                         req->req.status = 0;
1140                         }
1141
1142                 /* many requests terminate without a short packet */
1143                 } else {
1144                         if (req->req.length == req->req.actual
1145                                         && !req->req.zero)
1146                                 req->req.status = 0;
1147                         if (urb->transfer_buffer_length == urb->actual_length
1148                                         && !(urb->transfer_flags
1149                                                 & URB_ZERO_PACKET)) {
1150                                 maybe_set_status (urb, 0);
1151                         }
1152                 }
1153
1154                 /* device side completion --> continuable */
1155                 if (req->req.status != -EINPROGRESS) {
1156                         list_del_init (&req->queue);
1157
1158                         spin_unlock (&dum->lock);
1159                         req->req.complete (&ep->ep, &req->req);
1160                         spin_lock (&dum->lock);
1161
1162                         /* requests might have been unlinked... */
1163                         rescan = 1;
1164                 }
1165
1166                 /* host side completion --> terminate */
1167                 if (urb->status != -EINPROGRESS)
1168                         break;
1169
1170                 /* rescan to continue with any other queued i/o */
1171                 if (rescan)
1172                         goto top;
1173         }
1174         return limit;
1175 }
1176
1177 static int periodic_bytes (struct dummy *dum, struct dummy_ep *ep)
1178 {
1179         int     limit = ep->ep.maxpacket;
1180
1181         if (dum->gadget.speed == USB_SPEED_HIGH) {
1182                 int     tmp;
1183
1184                 /* high bandwidth mode */
1185                 tmp = le16_to_cpu(ep->desc->wMaxPacketSize);
1186                 tmp = (tmp >> 11) & 0x03;
1187                 tmp *= 8 /* applies to entire frame */;
1188                 limit += limit * tmp;
1189         }
1190         return limit;
1191 }
1192
1193 #define is_active(dum)  ((dum->port_status & \
1194                 (USB_PORT_STAT_CONNECTION | USB_PORT_STAT_ENABLE | \
1195                         USB_PORT_STAT_SUSPEND)) \
1196                 == (USB_PORT_STAT_CONNECTION | USB_PORT_STAT_ENABLE))
1197
1198 static struct dummy_ep *find_endpoint (struct dummy *dum, u8 address)
1199 {
1200         int             i;
1201
1202         if (!is_active (dum))
1203                 return NULL;
1204         if ((address & ~USB_DIR_IN) == 0)
1205                 return &dum->ep [0];
1206         for (i = 1; i < DUMMY_ENDPOINTS; i++) {
1207                 struct dummy_ep *ep = &dum->ep [i];
1208
1209                 if (!ep->desc)
1210                         continue;
1211                 if (ep->desc->bEndpointAddress == address)
1212                         return ep;
1213         }
1214         return NULL;
1215 }
1216
1217 #undef is_active
1218
1219 #define Dev_Request     (USB_TYPE_STANDARD | USB_RECIP_DEVICE)
1220 #define Dev_InRequest   (Dev_Request | USB_DIR_IN)
1221 #define Intf_Request    (USB_TYPE_STANDARD | USB_RECIP_INTERFACE)
1222 #define Intf_InRequest  (Intf_Request | USB_DIR_IN)
1223 #define Ep_Request      (USB_TYPE_STANDARD | USB_RECIP_ENDPOINT)
1224 #define Ep_InRequest    (Ep_Request | USB_DIR_IN)
1225
1226 /* drive both sides of the transfers; looks like irq handlers to
1227  * both drivers except the callbacks aren't in_irq().
1228  */
1229 static void dummy_timer (unsigned long _dum)
1230 {
1231         struct dummy            *dum = (struct dummy *) _dum;
1232         struct urbp             *urbp, *tmp;
1233         unsigned long           flags;
1234         int                     limit, total;
1235         int                     i;
1236
1237         /* simplistic model for one frame's bandwidth */
1238         switch (dum->gadget.speed) {
1239         case USB_SPEED_LOW:
1240                 total = 8/*bytes*/ * 12/*packets*/;
1241                 break;
1242         case USB_SPEED_FULL:
1243                 total = 64/*bytes*/ * 19/*packets*/;
1244                 break;
1245         case USB_SPEED_HIGH:
1246                 total = 512/*bytes*/ * 13/*packets*/ * 8/*uframes*/;
1247                 break;
1248         default:
1249                 dev_err (dummy_dev(dum), "bogus device speed\n");
1250                 return;
1251         }
1252
1253         /* FIXME if HZ != 1000 this will probably misbehave ... */
1254
1255         /* look at each urb queued by the host side driver */
1256         spin_lock_irqsave (&dum->lock, flags);
1257
1258         if (!dum->udev) {
1259                 dev_err (dummy_dev(dum),
1260                                 "timer fired with no URBs pending?\n");
1261                 spin_unlock_irqrestore (&dum->lock, flags);
1262                 return;
1263         }
1264
1265         for (i = 0; i < DUMMY_ENDPOINTS; i++) {
1266                 if (!ep_name [i])
1267                         break;
1268                 dum->ep [i].already_seen = 0;
1269         }
1270
1271 restart:
1272         list_for_each_entry_safe (urbp, tmp, &dum->urbp_list, urbp_list) {
1273                 struct urb              *urb;
1274                 struct dummy_request    *req;
1275                 u8                      address;
1276                 struct dummy_ep         *ep = NULL;
1277                 int                     type;
1278
1279                 urb = urbp->urb;
1280                 if (urb->status != -EINPROGRESS) {
1281                         /* likely it was just unlinked */
1282                         goto return_urb;
1283                 } else if (dum->rh_state != DUMMY_RH_RUNNING)
1284                         continue;
1285                 type = usb_pipetype (urb->pipe);
1286
1287                 /* used up this frame's non-periodic bandwidth?
1288                  * FIXME there's infinite bandwidth for control and
1289                  * periodic transfers ... unrealistic.
1290                  */
1291                 if (total <= 0 && type == PIPE_BULK)
1292                         continue;
1293
1294                 /* find the gadget's ep for this request (if configured) */
1295                 address = usb_pipeendpoint (urb->pipe);
1296                 if (usb_pipein (urb->pipe))
1297                         address |= USB_DIR_IN;
1298                 ep = find_endpoint(dum, address);
1299                 if (!ep) {
1300                         /* set_configuration() disagreement */
1301                         dev_dbg (dummy_dev(dum),
1302                                 "no ep configured for urb %p\n",
1303                                 urb);
1304                         maybe_set_status (urb, -EPROTO);
1305                         goto return_urb;
1306                 }
1307
1308                 if (ep->already_seen)
1309                         continue;
1310                 ep->already_seen = 1;
1311                 if (ep == &dum->ep [0] && urb->error_count) {
1312                         ep->setup_stage = 1;    /* a new urb */
1313                         urb->error_count = 0;
1314                 }
1315                 if (ep->halted && !ep->setup_stage) {
1316                         /* NOTE: must not be iso! */
1317                         dev_dbg (dummy_dev(dum), "ep %s halted, urb %p\n",
1318                                         ep->ep.name, urb);
1319                         maybe_set_status (urb, -EPIPE);
1320                         goto return_urb;
1321                 }
1322                 /* FIXME make sure both ends agree on maxpacket */
1323
1324                 /* handle control requests */
1325                 if (ep == &dum->ep [0] && ep->setup_stage) {
1326                         struct usb_ctrlrequest          setup;
1327                         int                             value = 1;
1328                         struct dummy_ep                 *ep2;
1329                         unsigned                        w_index;
1330                         unsigned                        w_value;
1331
1332                         setup = *(struct usb_ctrlrequest*) urb->setup_packet;
1333                         w_index = le16_to_cpu(setup.wIndex);
1334                         w_value = le16_to_cpu(setup.wValue);
1335                         if (le16_to_cpu(setup.wLength) !=
1336                                         urb->transfer_buffer_length) {
1337                                 maybe_set_status (urb, -EOVERFLOW);
1338                                 goto return_urb;
1339                         }
1340
1341                         /* paranoia, in case of stale queued data */
1342                         list_for_each_entry (req, &ep->queue, queue) {
1343                                 list_del_init (&req->queue);
1344                                 req->req.status = -EOVERFLOW;
1345                                 dev_dbg (udc_dev(dum), "stale req = %p\n",
1346                                                 req);
1347
1348                                 spin_unlock (&dum->lock);
1349                                 req->req.complete (&ep->ep, &req->req);
1350                                 spin_lock (&dum->lock);
1351                                 ep->already_seen = 0;
1352                                 goto restart;
1353                         }
1354
1355                         /* gadget driver never sees set_address or operations
1356                          * on standard feature flags.  some hardware doesn't
1357                          * even expose them.
1358                          */
1359                         ep->last_io = jiffies;
1360                         ep->setup_stage = 0;
1361                         ep->halted = 0;
1362                         switch (setup.bRequest) {
1363                         case USB_REQ_SET_ADDRESS:
1364                                 if (setup.bRequestType != Dev_Request)
1365                                         break;
1366                                 dum->address = w_value;
1367                                 maybe_set_status (urb, 0);
1368                                 dev_dbg (udc_dev(dum), "set_address = %d\n",
1369                                                 w_value);
1370                                 value = 0;
1371                                 break;
1372                         case USB_REQ_SET_FEATURE:
1373                                 if (setup.bRequestType == Dev_Request) {
1374                                         value = 0;
1375                                         switch (w_value) {
1376                                         case USB_DEVICE_REMOTE_WAKEUP:
1377                                                 break;
1378                                         case USB_DEVICE_B_HNP_ENABLE:
1379                                                 dum->gadget.b_hnp_enable = 1;
1380                                                 break;
1381                                         case USB_DEVICE_A_HNP_SUPPORT:
1382                                                 dum->gadget.a_hnp_support = 1;
1383                                                 break;
1384                                         case USB_DEVICE_A_ALT_HNP_SUPPORT:
1385                                                 dum->gadget.a_alt_hnp_support
1386                                                         = 1;
1387                                                 break;
1388                                         default:
1389                                                 value = -EOPNOTSUPP;
1390                                         }
1391                                         if (value == 0) {
1392                                                 dum->devstatus |=
1393                                                         (1 << w_value);
1394                                                 maybe_set_status (urb, 0);
1395                                         }
1396
1397                                 } else if (setup.bRequestType == Ep_Request) {
1398                                         // endpoint halt
1399                                         ep2 = find_endpoint (dum, w_index);
1400                                         if (!ep2) {
1401                                                 value = -EOPNOTSUPP;
1402                                                 break;
1403                                         }
1404                                         ep2->halted = 1;
1405                                         value = 0;
1406                                         maybe_set_status (urb, 0);
1407                                 }
1408                                 break;
1409                         case USB_REQ_CLEAR_FEATURE:
1410                                 if (setup.bRequestType == Dev_Request) {
1411                                         switch (w_value) {
1412                                         case USB_DEVICE_REMOTE_WAKEUP:
1413                                                 dum->devstatus &= ~(1 <<
1414                                                         USB_DEVICE_REMOTE_WAKEUP);
1415                                                 value = 0;
1416                                                 maybe_set_status (urb, 0);
1417                                                 break;
1418                                         default:
1419                                                 value = -EOPNOTSUPP;
1420                                                 break;
1421                                         }
1422                                 } else if (setup.bRequestType == Ep_Request) {
1423                                         // endpoint halt
1424                                         ep2 = find_endpoint (dum, w_index);
1425                                         if (!ep2) {
1426                                                 value = -EOPNOTSUPP;
1427                                                 break;
1428                                         }
1429                                         ep2->halted = 0;
1430                                         value = 0;
1431                                         maybe_set_status (urb, 0);
1432                                 }
1433                                 break;
1434                         case USB_REQ_GET_STATUS:
1435                                 if (setup.bRequestType == Dev_InRequest
1436                                                 || setup.bRequestType
1437                                                         == Intf_InRequest
1438                                                 || setup.bRequestType
1439                                                         == Ep_InRequest
1440                                                 ) {
1441                                         char *buf;
1442
1443                                         // device: remote wakeup, selfpowered
1444                                         // interface: nothing
1445                                         // endpoint: halt
1446                                         buf = (char *)urb->transfer_buffer;
1447                                         if (urb->transfer_buffer_length > 0) {
1448                                                 if (setup.bRequestType ==
1449                                                                 Ep_InRequest) {
1450         ep2 = find_endpoint (dum, w_index);
1451         if (!ep2) {
1452                 value = -EOPNOTSUPP;
1453                 break;
1454         }
1455         buf [0] = ep2->halted;
1456                                                 } else if (setup.bRequestType ==
1457                                                                 Dev_InRequest) {
1458                                                         buf [0] = (u8)
1459                                                                 dum->devstatus;
1460                                                 } else
1461                                                         buf [0] = 0;
1462                                         }
1463                                         if (urb->transfer_buffer_length > 1)
1464                                                 buf [1] = 0;
1465                                         urb->actual_length = min (2,
1466                                                 urb->transfer_buffer_length);
1467                                         value = 0;
1468                                         maybe_set_status (urb, 0);
1469                                 }
1470                                 break;
1471                         }
1472
1473                         /* gadget driver handles all other requests.  block
1474                          * until setup() returns; no reentrancy issues etc.
1475                          */
1476                         if (value > 0) {
1477                                 spin_unlock (&dum->lock);
1478                                 value = dum->driver->setup (&dum->gadget,
1479                                                 &setup);
1480                                 spin_lock (&dum->lock);
1481
1482                                 if (value >= 0) {
1483                                         /* no delays (max 64KB data stage) */
1484                                         limit = 64*1024;
1485                                         goto treat_control_like_bulk;
1486                                 }
1487                                 /* error, see below */
1488                         }
1489
1490                         if (value < 0) {
1491                                 if (value != -EOPNOTSUPP)
1492                                         dev_dbg (udc_dev(dum),
1493                                                 "setup --> %d\n",
1494                                                 value);
1495                                 maybe_set_status (urb, -EPIPE);
1496                                 urb->actual_length = 0;
1497                         }
1498
1499                         goto return_urb;
1500                 }
1501
1502                 /* non-control requests */
1503                 limit = total;
1504                 switch (usb_pipetype (urb->pipe)) {
1505                 case PIPE_ISOCHRONOUS:
1506                         /* FIXME is it urb->interval since the last xfer?
1507                          * use urb->iso_frame_desc[i].
1508                          * complete whether or not ep has requests queued.
1509                          * report random errors, to debug drivers.
1510                          */
1511                         limit = max (limit, periodic_bytes (dum, ep));
1512                         maybe_set_status (urb, -ENOSYS);
1513                         break;
1514
1515                 case PIPE_INTERRUPT:
1516                         /* FIXME is it urb->interval since the last xfer?
1517                          * this almost certainly polls too fast.
1518                          */
1519                         limit = max (limit, periodic_bytes (dum, ep));
1520                         /* FALLTHROUGH */
1521
1522                 // case PIPE_BULK:  case PIPE_CONTROL:
1523                 default:
1524                 treat_control_like_bulk:
1525                         ep->last_io = jiffies;
1526                         total = transfer (dum, urb, ep, limit);
1527                         break;
1528                 }
1529
1530                 /* incomplete transfer? */
1531                 if (urb->status == -EINPROGRESS)
1532                         continue;
1533
1534 return_urb:
1535                 urb->hcpriv = NULL;
1536                 list_del (&urbp->urbp_list);
1537                 kfree (urbp);
1538                 if (ep)
1539                         ep->already_seen = ep->setup_stage = 0;
1540
1541                 spin_unlock (&dum->lock);
1542                 usb_hcd_giveback_urb (dummy_to_hcd(dum), urb, NULL);
1543                 spin_lock (&dum->lock);
1544
1545                 goto restart;
1546         }
1547
1548         if (list_empty (&dum->urbp_list)) {
1549                 usb_put_dev (dum->udev);
1550                 dum->udev = NULL;
1551         } else if (dum->rh_state == DUMMY_RH_RUNNING) {
1552                 /* want a 1 msec delay here */
1553                 mod_timer (&dum->timer, jiffies + msecs_to_jiffies(1));
1554         }
1555
1556         spin_unlock_irqrestore (&dum->lock, flags);
1557 }
1558
1559 /*-------------------------------------------------------------------------*/
1560
1561 #define PORT_C_MASK \
1562         ((USB_PORT_STAT_C_CONNECTION \
1563         | USB_PORT_STAT_C_ENABLE \
1564         | USB_PORT_STAT_C_SUSPEND \
1565         | USB_PORT_STAT_C_OVERCURRENT \
1566         | USB_PORT_STAT_C_RESET) << 16)
1567
1568 static int dummy_hub_status (struct usb_hcd *hcd, char *buf)
1569 {
1570         struct dummy            *dum;
1571         unsigned long           flags;
1572         int                     retval = 0;
1573
1574         dum = hcd_to_dummy (hcd);
1575
1576         spin_lock_irqsave (&dum->lock, flags);
1577         if (!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags))
1578                 goto done;
1579
1580         if (dum->resuming && time_after_eq (jiffies, dum->re_timeout)) {
1581                 dum->port_status |= (USB_PORT_STAT_C_SUSPEND << 16);
1582                 dum->port_status &= ~USB_PORT_STAT_SUSPEND;
1583                 set_link_state (dum);
1584         }
1585
1586         if ((dum->port_status & PORT_C_MASK) != 0) {
1587                 *buf = (1 << 1);
1588                 dev_dbg (dummy_dev(dum), "port status 0x%08x has changes\n",
1589                                 dum->port_status);
1590                 retval = 1;
1591                 if (dum->rh_state == DUMMY_RH_SUSPENDED)
1592                         usb_hcd_resume_root_hub (hcd);
1593         }
1594 done:
1595         spin_unlock_irqrestore (&dum->lock, flags);
1596         return retval;
1597 }
1598
1599 static inline void
1600 hub_descriptor (struct usb_hub_descriptor *desc)
1601 {
1602         memset (desc, 0, sizeof *desc);
1603         desc->bDescriptorType = 0x29;
1604         desc->bDescLength = 9;
1605         desc->wHubCharacteristics = (__force __u16)
1606                         (__constant_cpu_to_le16 (0x0001));
1607         desc->bNbrPorts = 1;
1608         desc->bitmap [0] = 0xff;
1609         desc->bitmap [1] = 0xff;
1610 }
1611
1612 static int dummy_hub_control (
1613         struct usb_hcd  *hcd,
1614         u16             typeReq,
1615         u16             wValue,
1616         u16             wIndex,
1617         char            *buf,
1618         u16             wLength
1619 ) {
1620         struct dummy    *dum;
1621         int             retval = 0;
1622         unsigned long   flags;
1623
1624         if (!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags))
1625                 return -ETIMEDOUT;
1626
1627         dum = hcd_to_dummy (hcd);
1628         spin_lock_irqsave (&dum->lock, flags);
1629         switch (typeReq) {
1630         case ClearHubFeature:
1631                 break;
1632         case ClearPortFeature:
1633                 switch (wValue) {
1634                 case USB_PORT_FEAT_SUSPEND:
1635                         if (dum->port_status & USB_PORT_STAT_SUSPEND) {
1636                                 /* 20msec resume signaling */
1637                                 dum->resuming = 1;
1638                                 dum->re_timeout = jiffies +
1639                                                 msecs_to_jiffies(20);
1640                         }
1641                         break;
1642                 case USB_PORT_FEAT_POWER:
1643                         if (dum->port_status & USB_PORT_STAT_POWER)
1644                                 dev_dbg (dummy_dev(dum), "power-off\n");
1645                         /* FALLS THROUGH */
1646                 default:
1647                         dum->port_status &= ~(1 << wValue);
1648                         set_link_state (dum);
1649                 }
1650                 break;
1651         case GetHubDescriptor:
1652                 hub_descriptor ((struct usb_hub_descriptor *) buf);
1653                 break;
1654         case GetHubStatus:
1655                 *(__le32 *) buf = __constant_cpu_to_le32 (0);
1656                 break;
1657         case GetPortStatus:
1658                 if (wIndex != 1)
1659                         retval = -EPIPE;
1660
1661                 /* whoever resets or resumes must GetPortStatus to
1662                  * complete it!!
1663                  */
1664                 if (dum->resuming &&
1665                                 time_after_eq (jiffies, dum->re_timeout)) {
1666                         dum->port_status |= (USB_PORT_STAT_C_SUSPEND << 16);
1667                         dum->port_status &= ~USB_PORT_STAT_SUSPEND;
1668                 }
1669                 if ((dum->port_status & USB_PORT_STAT_RESET) != 0 &&
1670                                 time_after_eq (jiffies, dum->re_timeout)) {
1671                         dum->port_status |= (USB_PORT_STAT_C_RESET << 16);
1672                         dum->port_status &= ~USB_PORT_STAT_RESET;
1673                         if (dum->pullup) {
1674                                 dum->port_status |= USB_PORT_STAT_ENABLE;
1675                                 /* give it the best speed we agree on */
1676                                 dum->gadget.speed = dum->driver->speed;
1677                                 dum->gadget.ep0->maxpacket = 64;
1678                                 switch (dum->gadget.speed) {
1679                                 case USB_SPEED_HIGH:
1680                                         dum->port_status |=
1681                                                 USB_PORT_STAT_HIGH_SPEED;
1682                                         break;
1683                                 case USB_SPEED_LOW:
1684                                         dum->gadget.ep0->maxpacket = 8;
1685                                         dum->port_status |=
1686                                                 USB_PORT_STAT_LOW_SPEED;
1687                                         break;
1688                                 default:
1689                                         dum->gadget.speed = USB_SPEED_FULL;
1690                                         break;
1691                                 }
1692                         }
1693                 }
1694                 set_link_state (dum);
1695                 ((__le16 *) buf)[0] = cpu_to_le16 (dum->port_status);
1696                 ((__le16 *) buf)[1] = cpu_to_le16 (dum->port_status >> 16);
1697                 break;
1698         case SetHubFeature:
1699                 retval = -EPIPE;
1700                 break;
1701         case SetPortFeature:
1702                 switch (wValue) {
1703                 case USB_PORT_FEAT_SUSPEND:
1704                         if (dum->active) {
1705                                 dum->port_status |= USB_PORT_STAT_SUSPEND;
1706
1707                                 /* HNP would happen here; for now we
1708                                  * assume b_bus_req is always true.
1709                                  */
1710                                 set_link_state (dum);
1711                                 if (((1 << USB_DEVICE_B_HNP_ENABLE)
1712                                                 & dum->devstatus) != 0)
1713                                         dev_dbg (dummy_dev(dum),
1714                                                         "no HNP yet!\n");
1715                         }
1716                         break;
1717                 case USB_PORT_FEAT_POWER:
1718                         dum->port_status |= USB_PORT_STAT_POWER;
1719                         set_link_state (dum);
1720                         break;
1721                 case USB_PORT_FEAT_RESET:
1722                         /* if it's already enabled, disable */
1723                         dum->port_status &= ~(USB_PORT_STAT_ENABLE
1724                                         | USB_PORT_STAT_LOW_SPEED
1725                                         | USB_PORT_STAT_HIGH_SPEED);
1726                         dum->devstatus = 0;
1727                         /* 50msec reset signaling */
1728                         dum->re_timeout = jiffies + msecs_to_jiffies(50);
1729                         /* FALLS THROUGH */
1730                 default:
1731                         if ((dum->port_status & USB_PORT_STAT_POWER) != 0) {
1732                                 dum->port_status |= (1 << wValue);
1733                                 set_link_state (dum);
1734                         }
1735                 }
1736                 break;
1737
1738         default:
1739                 dev_dbg (dummy_dev(dum),
1740                         "hub control req%04x v%04x i%04x l%d\n",
1741                         typeReq, wValue, wIndex, wLength);
1742
1743                 /* "protocol stall" on error */
1744                 retval = -EPIPE;
1745         }
1746         spin_unlock_irqrestore (&dum->lock, flags);
1747
1748         if ((dum->port_status & PORT_C_MASK) != 0)
1749                 usb_hcd_poll_rh_status (hcd);
1750         return retval;
1751 }
1752
1753 static int dummy_bus_suspend (struct usb_hcd *hcd)
1754 {
1755         struct dummy *dum = hcd_to_dummy (hcd);
1756
1757         dev_dbg (&hcd->self.root_hub->dev, "%s\n", __FUNCTION__);
1758
1759         spin_lock_irq (&dum->lock);
1760         dum->rh_state = DUMMY_RH_SUSPENDED;
1761         set_link_state (dum);
1762         hcd->state = HC_STATE_SUSPENDED;
1763         spin_unlock_irq (&dum->lock);
1764         return 0;
1765 }
1766
1767 static int dummy_bus_resume (struct usb_hcd *hcd)
1768 {
1769         struct dummy *dum = hcd_to_dummy (hcd);
1770         int rc = 0;
1771
1772         dev_dbg (&hcd->self.root_hub->dev, "%s\n", __FUNCTION__);
1773
1774         spin_lock_irq (&dum->lock);
1775         if (!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags)) {
1776                 dev_warn (&hcd->self.root_hub->dev, "HC isn't running!\n");
1777                 rc = -ENODEV;
1778         } else {
1779                 dum->rh_state = DUMMY_RH_RUNNING;
1780                 set_link_state (dum);
1781                 if (!list_empty(&dum->urbp_list))
1782                         mod_timer (&dum->timer, jiffies);
1783                 hcd->state = HC_STATE_RUNNING;
1784         }
1785         spin_unlock_irq (&dum->lock);
1786         return rc;
1787 }
1788
1789 /*-------------------------------------------------------------------------*/
1790
1791 static inline ssize_t
1792 show_urb (char *buf, size_t size, struct urb *urb)
1793 {
1794         int ep = usb_pipeendpoint (urb->pipe);
1795
1796         return snprintf (buf, size,
1797                 "urb/%p %s ep%d%s%s len %d/%d\n",
1798                 urb,
1799                 ({ char *s;
1800                  switch (urb->dev->speed) {
1801                  case USB_SPEED_LOW:    s = "ls"; break;
1802                  case USB_SPEED_FULL:   s = "fs"; break;
1803                  case USB_SPEED_HIGH:   s = "hs"; break;
1804                  default:               s = "?"; break;
1805                  }; s; }),
1806                 ep, ep ? (usb_pipein (urb->pipe) ? "in" : "out") : "",
1807                 ({ char *s; \
1808                  switch (usb_pipetype (urb->pipe)) { \
1809                  case PIPE_CONTROL:     s = ""; break; \
1810                  case PIPE_BULK:        s = "-bulk"; break; \
1811                  case PIPE_INTERRUPT:   s = "-int"; break; \
1812                  default:               s = "-iso"; break; \
1813                 }; s;}),
1814                 urb->actual_length, urb->transfer_buffer_length);
1815 }
1816
1817 static ssize_t
1818 show_urbs (struct device *dev, struct device_attribute *attr, char *buf)
1819 {
1820         struct usb_hcd          *hcd = dev_get_drvdata (dev);
1821         struct dummy            *dum = hcd_to_dummy (hcd);
1822         struct urbp             *urbp;
1823         size_t                  size = 0;
1824         unsigned long           flags;
1825
1826         spin_lock_irqsave (&dum->lock, flags);
1827         list_for_each_entry (urbp, &dum->urbp_list, urbp_list) {
1828                 size_t          temp;
1829
1830                 temp = show_urb (buf, PAGE_SIZE - size, urbp->urb);
1831                 buf += temp;
1832                 size += temp;
1833         }
1834         spin_unlock_irqrestore (&dum->lock, flags);
1835
1836         return size;
1837 }
1838 static DEVICE_ATTR (urbs, S_IRUGO, show_urbs, NULL);
1839
1840 static int dummy_start (struct usb_hcd *hcd)
1841 {
1842         struct dummy            *dum;
1843
1844         dum = hcd_to_dummy (hcd);
1845
1846         /*
1847          * MASTER side init ... we emulate a root hub that'll only ever
1848          * talk to one device (the slave side).  Also appears in sysfs,
1849          * just like more familiar pci-based HCDs.
1850          */
1851         spin_lock_init (&dum->lock);
1852         init_timer (&dum->timer);
1853         dum->timer.function = dummy_timer;
1854         dum->timer.data = (unsigned long) dum;
1855         dum->rh_state = DUMMY_RH_RUNNING;
1856
1857         INIT_LIST_HEAD (&dum->urbp_list);
1858
1859         /* only show a low-power port: just 8mA */
1860         hcd->power_budget = 8;
1861         hcd->state = HC_STATE_RUNNING;
1862         hcd->uses_new_polling = 1;
1863
1864 #ifdef CONFIG_USB_OTG
1865         hcd->self.otg_port = 1;
1866 #endif
1867
1868         /* FIXME 'urbs' should be a per-device thing, maybe in usbcore */
1869         device_create_file (dummy_dev(dum), &dev_attr_urbs);
1870         return 0;
1871 }
1872
1873 static void dummy_stop (struct usb_hcd *hcd)
1874 {
1875         struct dummy            *dum;
1876
1877         dum = hcd_to_dummy (hcd);
1878
1879         device_remove_file (dummy_dev(dum), &dev_attr_urbs);
1880         usb_gadget_unregister_driver (dum->driver);
1881         dev_info (dummy_dev(dum), "stopped\n");
1882 }
1883
1884 /*-------------------------------------------------------------------------*/
1885
1886 static int dummy_h_get_frame (struct usb_hcd *hcd)
1887 {
1888         return dummy_g_get_frame (NULL);
1889 }
1890
1891 static const struct hc_driver dummy_hcd = {
1892         .description =          (char *) driver_name,
1893         .product_desc =         "Dummy host controller",
1894         .hcd_priv_size =        sizeof(struct dummy),
1895
1896         .flags =                HCD_USB2,
1897
1898         .start =                dummy_start,
1899         .stop =                 dummy_stop,
1900
1901         .urb_enqueue =          dummy_urb_enqueue,
1902         .urb_dequeue =          dummy_urb_dequeue,
1903
1904         .get_frame_number =     dummy_h_get_frame,
1905
1906         .hub_status_data =      dummy_hub_status,
1907         .hub_control =          dummy_hub_control,
1908         .bus_suspend =          dummy_bus_suspend,
1909         .bus_resume =           dummy_bus_resume,
1910 };
1911
1912 static int dummy_hcd_probe(struct platform_device *pdev)
1913 {
1914         struct usb_hcd          *hcd;
1915         int                     retval;
1916
1917         dev_info(&pdev->dev, "%s, driver " DRIVER_VERSION "\n", driver_desc);
1918
1919         hcd = usb_create_hcd(&dummy_hcd, &pdev->dev, pdev->dev.bus_id);
1920         if (!hcd)
1921                 return -ENOMEM;
1922         the_controller = hcd_to_dummy (hcd);
1923
1924         retval = usb_add_hcd(hcd, 0, 0);
1925         if (retval != 0) {
1926                 usb_put_hcd (hcd);
1927                 the_controller = NULL;
1928         }
1929         return retval;
1930 }
1931
1932 static int dummy_hcd_remove (struct platform_device *pdev)
1933 {
1934         struct usb_hcd          *hcd;
1935
1936         hcd = platform_get_drvdata (pdev);
1937         usb_remove_hcd (hcd);
1938         usb_put_hcd (hcd);
1939         the_controller = NULL;
1940         return 0;
1941 }
1942
1943 static int dummy_hcd_suspend (struct platform_device *pdev, pm_message_t state)
1944 {
1945         struct usb_hcd          *hcd;
1946         struct dummy            *dum;
1947         int                     rc = 0;
1948
1949         dev_dbg (&pdev->dev, "%s\n", __FUNCTION__);
1950
1951         hcd = platform_get_drvdata (pdev);
1952         dum = hcd_to_dummy (hcd);
1953         if (dum->rh_state == DUMMY_RH_RUNNING) {
1954                 dev_warn(&pdev->dev, "Root hub isn't suspended!\n");
1955                 rc = -EBUSY;
1956         } else
1957                 clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
1958         return rc;
1959 }
1960
1961 static int dummy_hcd_resume (struct platform_device *pdev)
1962 {
1963         struct usb_hcd          *hcd;
1964
1965         dev_dbg (&pdev->dev, "%s\n", __FUNCTION__);
1966
1967         hcd = platform_get_drvdata (pdev);
1968         set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
1969         usb_hcd_poll_rh_status (hcd);
1970         return 0;
1971 }
1972
1973 static struct platform_driver dummy_hcd_driver = {
1974         .probe          = dummy_hcd_probe,
1975         .remove         = dummy_hcd_remove,
1976         .suspend        = dummy_hcd_suspend,
1977         .resume         = dummy_hcd_resume,
1978         .driver         = {
1979                 .name   = (char *) driver_name,
1980                 .owner  = THIS_MODULE,
1981         },
1982 };
1983
1984 /*-------------------------------------------------------------------------*/
1985
1986 /* These don't need to do anything because the pdev structures are
1987  * statically allocated. */
1988 static void
1989 dummy_udc_release (struct device *dev) {}
1990
1991 static void
1992 dummy_hcd_release (struct device *dev) {}
1993
1994 static struct platform_device           the_udc_pdev = {
1995         .name           = (char *) gadget_name,
1996         .id             = -1,
1997         .dev            = {
1998                 .release        = dummy_udc_release,
1999         },
2000 };
2001
2002 static struct platform_device           the_hcd_pdev = {
2003         .name           = (char *) driver_name,
2004         .id             = -1,
2005         .dev            = {
2006                 .release        = dummy_hcd_release,
2007         },
2008 };
2009
2010 static int __init init (void)
2011 {
2012         int     retval;
2013
2014         if (usb_disabled ())
2015                 return -ENODEV;
2016
2017         retval = platform_driver_register (&dummy_hcd_driver);
2018         if (retval < 0)
2019                 return retval;
2020
2021         retval = platform_driver_register (&dummy_udc_driver);
2022         if (retval < 0)
2023                 goto err_register_udc_driver;
2024
2025         retval = platform_device_register (&the_hcd_pdev);
2026         if (retval < 0)
2027                 goto err_register_hcd;
2028
2029         retval = platform_device_register (&the_udc_pdev);
2030         if (retval < 0)
2031                 goto err_register_udc;
2032         return retval;
2033
2034 err_register_udc:
2035         platform_device_unregister (&the_hcd_pdev);
2036 err_register_hcd:
2037         platform_driver_unregister (&dummy_udc_driver);
2038 err_register_udc_driver:
2039         platform_driver_unregister (&dummy_hcd_driver);
2040         return retval;
2041 }
2042 module_init (init);
2043
2044 static void __exit cleanup (void)
2045 {
2046         platform_device_unregister (&the_udc_pdev);
2047         platform_device_unregister (&the_hcd_pdev);
2048         platform_driver_unregister (&dummy_udc_driver);
2049         platform_driver_unregister (&dummy_hcd_driver);
2050 }
2051 module_exit (cleanup);