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 #include <linux/module.h>
  38 #include <linux/kernel.h>
  39 #include <linux/delay.h>
  40 #include <linux/ioport.h>
  41 #include <linux/slab.h>
  42 #include <linux/errno.h>
  43 #include <linux/init.h>
  44 #include <linux/timer.h>
  45 #include <linux/list.h>
  46 #include <linux/interrupt.h>
  47 #include <linux/platform_device.h>
  48 #include <linux/usb.h>
  49 #include <linux/usb/gadget.h>
  50 #include <linux/usb/hcd.h>
  51
  52 #include <asm/byteorder.h>
  53 #include <asm/io.h>
  54 #include <asm/irq.h>
  55 #include <asm/system.h>
  56 #include <asm/unaligned.h>
  57
  58
  59 #define DRIVER_DESC     "USB Host+Gadget Emulator"
  60 #define DRIVER_VERSION  "02 May 2005"
  61
  62 #define POWER_BUDGET    500     /* in mA; use 8 for low-power port testing */
  63
  64 static const char       driver_name [] = "dummy_hcd";
  65 static const char       driver_desc [] = "USB Host+Gadget Emulator";
  66
  67 static const char       gadget_name [] = "dummy_udc";
  68
  69 MODULE_DESCRIPTION (DRIVER_DESC);
  70 MODULE_AUTHOR ("David Brownell");
  71 MODULE_LICENSE ("GPL");
  72
  73 /*-------------------------------------------------------------------------*/
  74
  75 /* gadget side driver data structres */
  76 struct dummy_ep {
  77         struct list_head                queue;
  78         unsigned long                   last_io;        /* jiffies timestamp */
  79         struct usb_gadget               *gadget;
  80         const struct usb_endpoint_descriptor *desc;
  81         struct usb_ep                   ep;
  82         unsigned                        halted : 1;
  83         unsigned                        wedged : 1;
  84         unsigned                        already_seen : 1;
  85         unsigned                        setup_stage : 1;
  86 };
  87
  88 struct dummy_request {
  89         struct list_head                queue;          /* ep's requests */
  90         struct usb_request              req;
  91 };
  92
  93 static inline struct dummy_ep *usb_ep_to_dummy_ep (struct usb_ep *_ep)
  94 {
  95         return container_of (_ep, struct dummy_ep, ep);
  96 }
  97
  98 static inline struct dummy_request *usb_request_to_dummy_request
  99                 (struct usb_request *_req)
 100 {
 101         return container_of (_req, struct dummy_request, req);
 102 }
 103
 104 /*-------------------------------------------------------------------------*/
 105
 106 /*
 107  * Every device has ep0 for control requests, plus up to 30 more endpoints,
 108  * in one of two types:
 109  *
 110  *   - Configurable:  direction (in/out), type (bulk, iso, etc), and endpoint
 111  *     number can be changed.  Names like "ep-a" are used for this type.
 112  *
 113  *   - Fixed Function:  in other cases.  some characteristics may be mutable;
 114  *     that'd be hardware-specific.  Names like "ep12out-bulk" are used.
 115  *
 116  * Gadget drivers are responsible for not setting up conflicting endpoint
 117  * configurations, illegal or unsupported packet lengths, and so on.
 118  */
 119
 120 static const char ep0name [] = "ep0";
 121
 122 static const char *const ep_name [] = {
 123         ep0name,                                /* everyone has ep0 */
 124
 125         /* act like a net2280: high speed, six configurable endpoints */
 126         "ep-a", "ep-b", "ep-c", "ep-d", "ep-e", "ep-f",
 127
 128         /* or like pxa250: fifteen fixed function endpoints */
 129         "ep1in-bulk", "ep2out-bulk", "ep3in-iso", "ep4out-iso", "ep5in-int",
 130         "ep6in-bulk", "ep7out-bulk", "ep8in-iso", "ep9out-iso", "ep10in-int",
 131         "ep11in-bulk", "ep12out-bulk", "ep13in-iso", "ep14out-iso",
 132                 "ep15in-int",
 133
 134         /* or like sa1100: two fixed function endpoints */
 135         "ep1out-bulk", "ep2in-bulk",
 136 };
 137 #define DUMMY_ENDPOINTS ARRAY_SIZE(ep_name)
 138
 139 /*-------------------------------------------------------------------------*/
 140
 141 #define FIFO_SIZE               64
 142
 143 struct urbp {
 144         struct urb              *urb;
 145         struct list_head        urbp_list;
 146 };
 147
 148
 149 enum dummy_rh_state {
 150         DUMMY_RH_RESET,
 151         DUMMY_RH_SUSPENDED,
 152         DUMMY_RH_RUNNING
 153 };
 154
 155 struct dummy {
 156         spinlock_t                      lock;
 157
 158         /*
 159          * SLAVE/GADGET side support
 160          */
 161         struct dummy_ep                 ep [DUMMY_ENDPOINTS];
 162         int                             address;
 163         struct usb_gadget               gadget;
 164         struct usb_gadget_driver        *driver;
 165         struct dummy_request            fifo_req;
 166         u8                              fifo_buf [FIFO_SIZE];
 167         u16                             devstatus;
 168         unsigned                        udc_suspended:1;
 169         unsigned                        pullup:1;
 170         unsigned                        active:1;
 171         unsigned                        old_active:1;
 172
 173         /*
 174          * MASTER/HOST side support
 175          */
 176         enum dummy_rh_state             rh_state;
 177         struct timer_list               timer;
 178         u32                             port_status;
 179         u32                             old_status;
 180         unsigned                        resuming:1;
 181         unsigned long                   re_timeout;
 182
 183         struct usb_device               *udev;
 184         struct list_head                urbp_list;
 185 };
 186
 187 static inline struct dummy *hcd_to_dummy (struct usb_hcd *hcd)
 188 {
 189         return (struct dummy *) (hcd->hcd_priv);
 190 }
 191
 192 static inline struct usb_hcd *dummy_to_hcd (struct dummy *dum)
 193 {
 194         return container_of((void *) dum, struct usb_hcd, hcd_priv);
 195 }
 196
 197 static inline struct device *dummy_dev (struct dummy *dum)
 198 {
 199         return dummy_to_hcd(dum)->self.controller;
 200 }
 201
 202 static inline struct device *udc_dev (struct dummy *dum)
 203 {
 204         return dum->gadget.dev.parent;
 205 }
 206
 207 static inline struct dummy *ep_to_dummy (struct dummy_ep *ep)
 208 {
 209         return container_of (ep->gadget, struct dummy, gadget);
 210 }
 211
 212 static inline struct dummy *gadget_to_dummy (struct usb_gadget *gadget)
 213 {
 214         return container_of (gadget, struct dummy, gadget);
 215 }
 216
 217 static inline struct dummy *gadget_dev_to_dummy (struct device *dev)
 218 {
 219         return container_of (dev, struct dummy, gadget.dev);
 220 }
 221
 222 static struct dummy                     *the_controller;
 223
 224 /*-------------------------------------------------------------------------*/
 225
 226 /* SLAVE/GADGET SIDE UTILITY ROUTINES */
 227
 228 /* called with spinlock held */
 229 static void nuke (struct dummy *dum, struct dummy_ep *ep)
 230 {
 231         while (!list_empty (&ep->queue)) {
 232                 struct dummy_request    *req;
 233
 234                 req = list_entry (ep->queue.next, struct dummy_request, queue);
 235                 list_del_init (&req->queue);
 236                 req->req.status = -ESHUTDOWN;
 237
 238                 spin_unlock (&dum->lock);
 239                 req->req.complete (&ep->ep, &req->req);
 240                 spin_lock (&dum->lock);
 241         }
 242 }
 243
 244 /* caller must hold lock */
 245 static void
 246 stop_activity (struct dummy *dum)
 247 {
 248         struct dummy_ep *ep;
 249
 250         /* prevent any more requests */
 251         dum->address = 0;
 252
 253         /* The timer is left running so that outstanding URBs can fail */
 254
 255         /* nuke any pending requests first, so driver i/o is quiesced */
 256         list_for_each_entry (ep, &dum->gadget.ep_list, ep.ep_list)
 257                 nuke (dum, ep);
 258
 259         /* driver now does any non-usb quiescing necessary */
 260 }
 261
 262 /* caller must hold lock */
 263 static void
 264 set_link_state (struct dummy *dum)
 265 {
 266         dum->active = 0;
 267         if ((dum->port_status & USB_PORT_STAT_POWER) == 0)
 268                 dum->port_status = 0;
 269
 270         /* UDC suspend must cause a disconnect */
 271         else if (!dum->pullup || dum->udc_suspended) {
 272                 dum->port_status &= ~(USB_PORT_STAT_CONNECTION |
 273                                         USB_PORT_STAT_ENABLE |
 274                                         USB_PORT_STAT_LOW_SPEED |
 275                                         USB_PORT_STAT_HIGH_SPEED |
 276                                         USB_PORT_STAT_SUSPEND);
 277                 if ((dum->old_status & USB_PORT_STAT_CONNECTION) != 0)
 278                         dum->port_status |= (USB_PORT_STAT_C_CONNECTION << 16);
 279         } else {
 280                 dum->port_status |= USB_PORT_STAT_CONNECTION;
 281                 if ((dum->old_status & USB_PORT_STAT_CONNECTION) == 0)
 282                         dum->port_status |= (USB_PORT_STAT_C_CONNECTION << 16);
 283                 if ((dum->port_status & USB_PORT_STAT_ENABLE) == 0)
 284                         dum->port_status &= ~USB_PORT_STAT_SUSPEND;
 285                 else if ((dum->port_status & USB_PORT_STAT_SUSPEND) == 0 &&
 286                                 dum->rh_state != DUMMY_RH_SUSPENDED)
 287                         dum->active = 1;
 288         }
 289
 290         if ((dum->port_status & USB_PORT_STAT_ENABLE) == 0 || dum->active)
 291                 dum->resuming = 0;
 292
 293         if ((dum->port_status & USB_PORT_STAT_CONNECTION) == 0 ||
 294                         (dum->port_status & USB_PORT_STAT_RESET) != 0) {
 295                 if ((dum->old_status & USB_PORT_STAT_CONNECTION) != 0 &&
 296                                 (dum->old_status & USB_PORT_STAT_RESET) == 0 &&
 297                                 dum->driver) {
 298                         stop_activity (dum);
 299                         spin_unlock (&dum->lock);
 300                         dum->driver->disconnect (&dum->gadget);
 301                         spin_lock (&dum->lock);
 302                 }
 303         } else if (dum->active != dum->old_active) {
 304                 if (dum->old_active && dum->driver->suspend) {
 305                         spin_unlock (&dum->lock);
 306                         dum->driver->suspend (&dum->gadget);
 307                         spin_lock (&dum->lock);
 308                 } else if (!dum->old_active && dum->driver->resume) {
 309                         spin_unlock (&dum->lock);
 310                         dum->driver->resume (&dum->gadget);
 311                         spin_lock (&dum->lock);
 312                 }
 313         }
 314
 315         dum->old_status = dum->port_status;
 316         dum->old_active = dum->active;
 317 }
 318
 319 /*-------------------------------------------------------------------------*/
 320
 321 /* SLAVE/GADGET SIDE DRIVER
 322  *
 323  * This only tracks gadget state.  All the work is done when the host
 324  * side tries some (emulated) i/o operation.  Real device controller
 325  * drivers would do real i/o using dma, fifos, irqs, timers, etc.
 326  */
 327
 328 #define is_enabled(dum) \
 329         (dum->port_status & USB_PORT_STAT_ENABLE)
 330
 331 static int
 332 dummy_enable (struct usb_ep *_ep, const struct usb_endpoint_descriptor *desc)
 333 {
 334         struct dummy            *dum;
 335         struct dummy_ep         *ep;
 336         unsigned                max;
 337         int                     retval;
 338
 339         ep = usb_ep_to_dummy_ep (_ep);
 340         if (!_ep || !desc || ep->desc || _ep->name == ep0name
 341                         || desc->bDescriptorType != USB_DT_ENDPOINT)
 342                 return -EINVAL;
 343         dum = ep_to_dummy (ep);
 344         if (!dum->driver || !is_enabled (dum))
 345                 return -ESHUTDOWN;
 346         max = le16_to_cpu(desc->wMaxPacketSize) & 0x3ff;
 347
 348         /* drivers must not request bad settings, since lower levels
 349          * (hardware or its drivers) may not check.  some endpoints
 350          * can't do iso, many have maxpacket limitations, etc.
 351          *
 352          * since this "hardware" driver is here to help debugging, we
 353          * have some extra sanity checks.  (there could be more though,
 354          * especially for "ep9out" style fixed function ones.)
 355          */
 356         retval = -EINVAL;
 357         switch (desc->bmAttributes & 0x03) {
 358         case USB_ENDPOINT_XFER_BULK:
 359                 if (strstr (ep->ep.name, "-iso")
 360                                 || strstr (ep->ep.name, "-int")) {
 361                         goto done;
 362                 }
 363                 switch (dum->gadget.speed) {
 364                 case USB_SPEED_HIGH:
 365                         if (max == 512)
 366                                 break;
 367                         goto done;
 368                 case USB_SPEED_FULL:
 369                         if (max == 8 || max == 16 || max == 32 || max == 64)
 370                                 /* we'll fake any legal size */
 371                                 break;
 372                         /* save a return statement */
 373                 default:
 374                         goto done;
 375                 }
 376                 break;
 377         case USB_ENDPOINT_XFER_INT:
 378                 if (strstr (ep->ep.name, "-iso")) /* bulk is ok */
 379                         goto done;
 380                 /* real hardware might not handle all packet sizes */
 381                 switch (dum->gadget.speed) {
 382                 case USB_SPEED_HIGH:
 383                         if (max <= 1024)
 384                                 break;
 385                         /* save a return statement */
 386                 case USB_SPEED_FULL:
 387                         if (max <= 64)
 388                                 break;
 389                         /* save a return statement */
 390                 default:
 391                         if (max <= 8)
 392                                 break;
 393                         goto done;
 394                 }
 395                 break;
 396         case USB_ENDPOINT_XFER_ISOC:
 397                 if (strstr (ep->ep.name, "-bulk")
 398                                 || strstr (ep->ep.name, "-int"))
 399                         goto done;
 400                 /* real hardware might not handle all packet sizes */
 401                 switch (dum->gadget.speed) {
 402                 case USB_SPEED_HIGH:
 403                         if (max <= 1024)
 404                                 break;
 405                         /* save a return statement */
 406                 case USB_SPEED_FULL:
 407                         if (max <= 1023)
 408                                 break;
 409                         /* save a return statement */
 410                 default:
 411                         goto done;
 412                 }
 413                 break;
 414         default:
 415                 /* few chips support control except on ep0 */
 416                 goto done;
 417         }
 418
 419         _ep->maxpacket = max;
 420         ep->desc = desc;
 421
 422         dev_dbg (udc_dev(dum), "enabled %s (ep%d%s-%s) maxpacket %d\n",
 423                 _ep->name,
 424                 desc->bEndpointAddress & 0x0f,
 425                 (desc->bEndpointAddress & USB_DIR_IN) ? "in" : "out",
 426                 ({ char *val;
 427                  switch (desc->bmAttributes & 0x03) {
 428                  case USB_ENDPOINT_XFER_BULK: val = "bulk"; break;
 429                  case USB_ENDPOINT_XFER_ISOC: val = "iso"; break;
 430                  case USB_ENDPOINT_XFER_INT: val = "intr"; break;
 431                  default: val = "ctrl"; break;
 432                  }; val; }),
 433                 max);
 434
 435         /* at this point real hardware should be NAKing transfers
 436          * to that endpoint, until a buffer is queued to it.
 437          */
 438         ep->halted = ep->wedged = 0;
 439         retval = 0;
 440 done:
 441         return retval;
 442 }
 443
 444 static int dummy_disable (struct usb_ep *_ep)
 445 {
 446         struct dummy_ep         *ep;
 447         struct dummy            *dum;
 448         unsigned long           flags;
 449         int                     retval;
 450
 451         ep = usb_ep_to_dummy_ep (_ep);
 452         if (!_ep || !ep->desc || _ep->name == ep0name)
 453                 return -EINVAL;
 454         dum = ep_to_dummy (ep);
 455
 456         spin_lock_irqsave (&dum->lock, flags);
 457         ep->desc = NULL;
 458         retval = 0;
 459         nuke (dum, ep);
 460         spin_unlock_irqrestore (&dum->lock, flags);
 461
 462         dev_dbg (udc_dev(dum), "disabled %s\n", _ep->name);
 463         return retval;
 464 }
 465
 466 static struct usb_request *
 467 dummy_alloc_request (struct usb_ep *_ep, gfp_t mem_flags)
 468 {
 469         struct dummy_ep         *ep;
 470         struct dummy_request    *req;
 471
 472         if (!_ep)
 473                 return NULL;
 474         ep = usb_ep_to_dummy_ep (_ep);
 475
 476         req = kzalloc(sizeof(*req), mem_flags);
 477         if (!req)
 478                 return NULL;
 479         INIT_LIST_HEAD (&req->queue);
 480         return &req->req;
 481 }
 482
 483 static void
 484 dummy_free_request (struct usb_ep *_ep, struct usb_request *_req)
 485 {
 486         struct dummy_ep         *ep;
 487         struct dummy_request    *req;
 488
 489         ep = usb_ep_to_dummy_ep (_ep);
 490         if (!ep || !_req || (!ep->desc && _ep->name != ep0name))
 491                 return;
 492
 493         req = usb_request_to_dummy_request (_req);
 494         WARN_ON (!list_empty (&req->queue));
 495         kfree (req);
 496 }
 497
 498 static void
 499 fifo_complete (struct usb_ep *ep, struct usb_request *req)
 500 {
 501 }
 502
 503 static int
 504 dummy_queue (struct usb_ep *_ep, struct usb_request *_req,
 505                 gfp_t mem_flags)
 506 {
 507         struct dummy_ep         *ep;
 508         struct dummy_request    *req;
 509         struct dummy            *dum;
 510         unsigned long           flags;
 511
 512         req = usb_request_to_dummy_request (_req);
 513         if (!_req || !list_empty (&req->queue) || !_req->complete)
 514                 return -EINVAL;
 515
 516         ep = usb_ep_to_dummy_ep (_ep);
 517         if (!_ep || (!ep->desc && _ep->name != ep0name))
 518                 return -EINVAL;
 519
 520         dum = ep_to_dummy (ep);
 521         if (!dum->driver || !is_enabled (dum))
 522                 return -ESHUTDOWN;
 523
 524 #if 0
 525         dev_dbg (udc_dev(dum), "ep %p queue req %p to %s, len %d buf %p\n",
 526                         ep, _req, _ep->name, _req->length, _req->buf);
 527 #endif
 528
 529         _req->status = -EINPROGRESS;
 530         _req->actual = 0;
 531         spin_lock_irqsave (&dum->lock, flags);
 532
 533         /* implement an emulated single-request FIFO */
 534         if (ep->desc && (ep->desc->bEndpointAddress & USB_DIR_IN) &&
 535                         list_empty (&dum->fifo_req.queue) &&
 536                         list_empty (&ep->queue) &&
 537                         _req->length <= FIFO_SIZE) {
 538                 req = &dum->fifo_req;
 539                 req->req = *_req;
 540                 req->req.buf = dum->fifo_buf;
 541                 memcpy (dum->fifo_buf, _req->buf, _req->length);
 542                 req->req.context = dum;
 543                 req->req.complete = fifo_complete;
 544
 545                 list_add_tail(&req->queue, &ep->queue);
 546                 spin_unlock (&dum->lock);
 547                 _req->actual = _req->length;
 548                 _req->status = 0;
 549                 _req->complete (_ep, _req);
 550                 spin_lock (&dum->lock);
 551         }  else
 552                 list_add_tail(&req->queue, &ep->queue);
 553         spin_unlock_irqrestore (&dum->lock, flags);
 554
 555         /* real hardware would likely enable transfers here, in case
 556          * it'd been left NAKing.
 557          */
 558         return 0;
 559 }
 560
 561 static int dummy_dequeue (struct usb_ep *_ep, struct usb_request *_req)
 562 {
 563         struct dummy_ep         *ep;
 564         struct dummy            *dum;
 565         int                     retval = -EINVAL;
 566         unsigned long           flags;
 567         struct dummy_request    *req = NULL;
 568
 569         if (!_ep || !_req)
 570                 return retval;
 571         ep = usb_ep_to_dummy_ep (_ep);
 572         dum = ep_to_dummy (ep);
 573
 574         if (!dum->driver)
 575                 return -ESHUTDOWN;
 576
 577         local_irq_save (flags);
 578         spin_lock (&dum->lock);
 579         list_for_each_entry (req, &ep->queue, queue) {
 580                 if (&req->req == _req) {
 581                         list_del_init (&req->queue);
 582                         _req->status = -ECONNRESET;
 583                         retval = 0;
 584                         break;
 585                 }
 586         }
 587         spin_unlock (&dum->lock);
 588
 589         if (retval == 0) {
 590                 dev_dbg (udc_dev(dum),
 591                                 "dequeued req %p from %s, len %d buf %p\n",
 592                                 req, _ep->name, _req->length, _req->buf);
 593                 _req->complete (_ep, _req);
 594         }
 595         local_irq_restore (flags);
 596         return retval;
 597 }
 598
 599 static int
 600 dummy_set_halt_and_wedge(struct usb_ep *_ep, int value, int wedged)
 601 {
 602         struct dummy_ep         *ep;
 603         struct dummy            *dum;
 604
 605         if (!_ep)
 606                 return -EINVAL;
 607         ep = usb_ep_to_dummy_ep (_ep);
 608         dum = ep_to_dummy (ep);
 609         if (!dum->driver)
 610                 return -ESHUTDOWN;
 611         if (!value)
 612                 ep->halted = ep->wedged = 0;
 613         else if (ep->desc && (ep->desc->bEndpointAddress & USB_DIR_IN) &&
 614                         !list_empty (&ep->queue))
 615                 return -EAGAIN;
 616         else {
 617                 ep->halted = 1;
 618                 if (wedged)
 619                         ep->wedged = 1;
 620         }
 621         /* FIXME clear emulated data toggle too */
 622         return 0;
 623 }
 624
 625 static int
 626 dummy_set_halt(struct usb_ep *_ep, int value)
 627 {
 628         return dummy_set_halt_and_wedge(_ep, value, 0);
 629 }
 630
 631 static int dummy_set_wedge(struct usb_ep *_ep)
 632 {
 633         if (!_ep || _ep->name == ep0name)
 634                 return -EINVAL;
 635         return dummy_set_halt_and_wedge(_ep, 1, 1);
 636 }
 637
 638 static const struct usb_ep_ops dummy_ep_ops = {
 639         .enable         = dummy_enable,
 640         .disable        = dummy_disable,
 641
 642         .alloc_request  = dummy_alloc_request,
 643         .free_request   = dummy_free_request,
 644
 645         .queue          = dummy_queue,
 646         .dequeue        = dummy_dequeue,
 647
 648         .set_halt       = dummy_set_halt,
 649         .set_wedge      = dummy_set_wedge,
 650 };
 651
 652 /*-------------------------------------------------------------------------*/
 653
 654 /* there are both host and device side versions of this call ... */
 655 static int dummy_g_get_frame (struct usb_gadget *_gadget)
 656 {
 657         struct timeval  tv;
 658
 659         do_gettimeofday (&tv);
 660         return tv.tv_usec / 1000;
 661 }
 662
 663 static int dummy_wakeup (struct usb_gadget *_gadget)
 664 {
 665         struct dummy    *dum;
 666
 667         dum = gadget_to_dummy (_gadget);
 668         if (!(dum->devstatus &  ( (1 << USB_DEVICE_B_HNP_ENABLE)
 669                                 | (1 << USB_DEVICE_REMOTE_WAKEUP))))
 670                 return -EINVAL;
 671         if ((dum->port_status & USB_PORT_STAT_CONNECTION) == 0)
 672                 return -ENOLINK;
 673         if ((dum->port_status & USB_PORT_STAT_SUSPEND) == 0 &&
 674                          dum->rh_state != DUMMY_RH_SUSPENDED)
 675                 return -EIO;
 676
 677         /* FIXME: What if the root hub is suspended but the port isn't? */
 678
 679         /* hub notices our request, issues downstream resume, etc */
 680         dum->resuming = 1;
 681         dum->re_timeout = jiffies + msecs_to_jiffies(20);
 682         mod_timer (&dummy_to_hcd (dum)->rh_timer, dum->re_timeout);
 683         return 0;
 684 }
 685
 686 static int dummy_set_selfpowered (struct usb_gadget *_gadget, int value)
 687 {
 688         struct dummy    *dum;
 689
 690         dum = gadget_to_dummy (_gadget);
 691         if (value)
 692                 dum->devstatus |= (1 << USB_DEVICE_SELF_POWERED);
 693         else
 694                 dum->devstatus &= ~(1 << USB_DEVICE_SELF_POWERED);
 695         return 0;
 696 }
 697
 698 static int dummy_pullup (struct usb_gadget *_gadget, int value)
 699 {
 700         struct dummy    *dum;
 701         unsigned long   flags;
 702
 703         dum = gadget_to_dummy (_gadget);
 704         spin_lock_irqsave (&dum->lock, flags);
 705         dum->pullup = (value != 0);
 706         set_link_state (dum);
 707         spin_unlock_irqrestore (&dum->lock, flags);
 708
 709         usb_hcd_poll_rh_status (dummy_to_hcd (dum));
 710         return 0;
 711 }
 712
 713 static const struct usb_gadget_ops dummy_ops = {
 714         .get_frame      = dummy_g_get_frame,
 715         .wakeup         = dummy_wakeup,
 716         .set_selfpowered = dummy_set_selfpowered,
 717         .pullup         = dummy_pullup,
 718 };
 719
 720 /*-------------------------------------------------------------------------*/
 721
 722 /* "function" sysfs attribute */
 723 static ssize_t
 724 show_function (struct device *dev, struct device_attribute *attr, char *buf)
 725 {
 726         struct dummy    *dum = gadget_dev_to_dummy (dev);
 727
 728         if (!dum->driver || !dum->driver->function)
 729                 return 0;
 730         return scnprintf (buf, PAGE_SIZE, "%s\n", dum->driver->function);
 731 }
 732 static DEVICE_ATTR (function, S_IRUGO, show_function, NULL);
 733
 734 /*-------------------------------------------------------------------------*/
 735
 736 /*
 737  * Driver registration/unregistration.
 738  *
 739  * This is basically hardware-specific; there's usually only one real USB
 740  * device (not host) controller since that's how USB devices are intended
 741  * to work.  So most implementations of these api calls will rely on the
 742  * fact that only one driver will ever bind to the hardware.  But curious
 743  * hardware can be built with discrete components, so the gadget API doesn't
 744  * require that assumption.
 745  *
 746  * For this emulator, it might be convenient to create a usb slave device
 747  * for each driver that registers:  just add to a big root hub.
 748  */
 749
 750 int
 751 usb_gadget_probe_driver(struct usb_gadget_driver *driver,
 752                 int (*bind)(struct usb_gadget *))
 753 {
 754         struct dummy    *dum = the_controller;
 755         int             retval, i;
 756
 757         if (!dum)
 758                 return -EINVAL;
 759         if (dum->driver)
 760                 return -EBUSY;
 761         if (!bind || !driver->setup || driver->speed == USB_SPEED_UNKNOWN)
 762                 return -EINVAL;
 763
 764         /*
 765          * SLAVE side init ... the layer above hardware, which
 766          * can't enumerate without help from the driver we're binding.
 767          */
 768
 769         dum->devstatus = 0;
 770
 771         INIT_LIST_HEAD (&dum->gadget.ep_list);
 772         for (i = 0; i < DUMMY_ENDPOINTS; i++) {
 773                 struct dummy_ep *ep = &dum->ep [i];
 774
 775                 if (!ep_name [i])
 776                         break;
 777                 ep->ep.name = ep_name [i];
 778                 ep->ep.ops = &dummy_ep_ops;
 779                 list_add_tail (&ep->ep.ep_list, &dum->gadget.ep_list);
 780                 ep->halted = ep->wedged = ep->already_seen =
 781                                 ep->setup_stage = 0;
 782                 ep->ep.maxpacket = ~0;
 783                 ep->last_io = jiffies;
 784                 ep->gadget = &dum->gadget;
 785                 ep->desc = NULL;
 786                 INIT_LIST_HEAD (&ep->queue);
 787         }
 788
 789         dum->gadget.ep0 = &dum->ep [0].ep;
 790         dum->ep [0].ep.maxpacket = 64;
 791         list_del_init (&dum->ep [0].ep.ep_list);
 792         INIT_LIST_HEAD(&dum->fifo_req.queue);
 793
 794         driver->driver.bus = NULL;
 795         dum->driver = driver;
 796         dum->gadget.dev.driver = &driver->driver;
 797         dev_dbg (udc_dev(dum), "binding gadget driver '%s'\n",
 798                         driver->driver.name);
 799         retval = bind(&dum->gadget);
 800         if (retval) {
 801                 dum->driver = NULL;
 802                 dum->gadget.dev.driver = NULL;
 803                 return retval;
 804         }
 805
 806         /* khubd will enumerate this in a while */
 807         spin_lock_irq (&dum->lock);
 808         dum->pullup = 1;
 809         set_link_state (dum);
 810         spin_unlock_irq (&dum->lock);
 811
 812         usb_hcd_poll_rh_status (dummy_to_hcd (dum));
 813         return 0;
 814 }
 815 EXPORT_SYMBOL(usb_gadget_probe_driver);
 816
 817 int
 818 usb_gadget_unregister_driver (struct usb_gadget_driver *driver)
 819 {
 820         struct dummy    *dum = the_controller;
 821         unsigned long   flags;
 822
 823         if (!dum)
 824                 return -ENODEV;
 825         if (!driver || driver != dum->driver || !driver->unbind)
 826                 return -EINVAL;
 827
 828         dev_dbg (udc_dev(dum), "unregister gadget driver '%s'\n",
 829                         driver->driver.name);
 830
 831         spin_lock_irqsave (&dum->lock, flags);
 832         dum->pullup = 0;
 833         set_link_state (dum);
 834         spin_unlock_irqrestore (&dum->lock, flags);
 835
 836         driver->unbind (&dum->gadget);
 837         dum->gadget.dev.driver = NULL;
 838         dum->driver = NULL;
 839
 840         spin_lock_irqsave (&dum->lock, flags);
 841         dum->pullup = 0;
 842         set_link_state (dum);
 843         spin_unlock_irqrestore (&dum->lock, flags);
 844
 845         usb_hcd_poll_rh_status (dummy_to_hcd (dum));
 846         return 0;
 847 }
 848 EXPORT_SYMBOL (usb_gadget_unregister_driver);
 849
 850 #undef is_enabled
 851
 852 /* just declare this in any driver that really need it */
 853 extern int net2280_set_fifo_mode (struct usb_gadget *gadget, int mode);
 854
 855 int net2280_set_fifo_mode (struct usb_gadget *gadget, int mode)
 856 {
 857         return -ENOSYS;
 858 }
 859 EXPORT_SYMBOL (net2280_set_fifo_mode);
 860
 861
 862 /* The gadget structure is stored inside the hcd structure and will be
 863  * released along with it. */
 864 static void
 865 dummy_gadget_release (struct device *dev)
 866 {
 867         struct dummy    *dum = gadget_dev_to_dummy (dev);
 868
 869         usb_put_hcd (dummy_to_hcd (dum));
 870 }
 871
 872 static int dummy_udc_probe (struct platform_device *pdev)
 873 {
 874         struct dummy    *dum = the_controller;
 875         int             rc;
 876
 877         usb_get_hcd(dummy_to_hcd(dum));
 878
 879         dum->gadget.name = gadget_name;
 880         dum->gadget.ops = &dummy_ops;
 881         dum->gadget.is_dualspeed = 1;
 882
 883         /* maybe claim OTG support, though we won't complete HNP */
 884         dum->gadget.is_otg = (dummy_to_hcd(dum)->self.otg_port != 0);
 885
 886         dev_set_name(&dum->gadget.dev, "gadget");
 887         dum->gadget.dev.parent = &pdev->dev;
 888         dum->gadget.dev.release = dummy_gadget_release;
 889         rc = device_register (&dum->gadget.dev);
 890         if (rc < 0) {
 891                 put_device(&dum->gadget.dev);
 892                 return rc;
 893         }
 894
 895         rc = device_create_file (&dum->gadget.dev, &dev_attr_function);
 896         if (rc < 0)
 897                 device_unregister (&dum->gadget.dev);
 898         else
 899                 platform_set_drvdata(pdev, dum);
 900         return rc;
 901 }
 902
 903 static int dummy_udc_remove (struct platform_device *pdev)
 904 {
 905         struct dummy    *dum = platform_get_drvdata (pdev);
 906
 907         platform_set_drvdata (pdev, NULL);
 908         device_remove_file (&dum->gadget.dev, &dev_attr_function);
 909         device_unregister (&dum->gadget.dev);
 910         return 0;
 911 }
 912
 913 static int dummy_udc_suspend (struct platform_device *pdev, pm_message_t state)
 914 {
 915         struct dummy    *dum = platform_get_drvdata(pdev);
 916
 917         dev_dbg (&pdev->dev, "%s\n", __func__);
 918         spin_lock_irq (&dum->lock);
 919         dum->udc_suspended = 1;
 920         set_link_state (dum);
 921         spin_unlock_irq (&dum->lock);
 922
 923         usb_hcd_poll_rh_status (dummy_to_hcd (dum));
 924         return 0;
 925 }
 926
 927 static int dummy_udc_resume (struct platform_device *pdev)
 928 {
 929         struct dummy    *dum = platform_get_drvdata(pdev);
 930
 931         dev_dbg (&pdev->dev, "%s\n", __func__);
 932         spin_lock_irq (&dum->lock);
 933         dum->udc_suspended = 0;
 934         set_link_state (dum);
 935         spin_unlock_irq (&dum->lock);
 936
 937         usb_hcd_poll_rh_status (dummy_to_hcd (dum));
 938         return 0;
 939 }
 940
 941 static struct platform_driver dummy_udc_driver = {
 942         .probe          = dummy_udc_probe,
 943         .remove         = dummy_udc_remove,
 944         .suspend        = dummy_udc_suspend,
 945         .resume         = dummy_udc_resume,
 946         .driver         = {
 947                 .name   = (char *) gadget_name,
 948                 .owner  = THIS_MODULE,
 949         },
 950 };
 951
 952 /*-------------------------------------------------------------------------*/
 953
 954 /* MASTER/HOST SIDE DRIVER
 955  *
 956  * this uses the hcd framework to hook up to host side drivers.
 957  * its root hub will only have one device, otherwise it acts like
 958  * a normal host controller.
 959  *
 960  * when urbs are queued, they're just stuck on a list that we
 961  * scan in a timer callback.  that callback connects writes from
 962  * the host with reads from the device, and so on, based on the
 963  * usb 2.0 rules.
 964  */
 965
 966 static int dummy_urb_enqueue (
 967         struct usb_hcd                  *hcd,
 968         struct urb                      *urb,
 969         gfp_t                           mem_flags
 970 ) {
 971         struct dummy    *dum;
 972         struct urbp     *urbp;
 973         unsigned long   flags;
 974         int             rc;
 975
 976         if (!urb->transfer_buffer && urb->transfer_buffer_length)
 977                 return -EINVAL;
 978
 979         urbp = kmalloc (sizeof *urbp, mem_flags);
 980         if (!urbp)
 981                 return -ENOMEM;
 982         urbp->urb = urb;
 983
 984         dum = hcd_to_dummy (hcd);
 985         spin_lock_irqsave (&dum->lock, flags);
 986         rc = usb_hcd_link_urb_to_ep(hcd, urb);
 987         if (rc) {
 988                 kfree(urbp);
 989                 goto done;
 990         }
 991
 992         if (!dum->udev) {
 993                 dum->udev = urb->dev;
 994                 usb_get_dev (dum->udev);
 995         } else if (unlikely (dum->udev != urb->dev))
 996                 dev_err (dummy_dev(dum), "usb_device address has changed!\n");
 997
 998         list_add_tail (&urbp->urbp_list, &dum->urbp_list);
 999         urb->hcpriv = urbp;
1000         if (usb_pipetype (urb->pipe) == PIPE_CONTROL)
1001                 urb->error_count = 1;           /* mark as a new urb */
1002
1003         /* kick the scheduler, it'll do the rest */
1004         if (!timer_pending (&dum->timer))
1005                 mod_timer (&dum->timer, jiffies + 1);
1006
1007  done:
1008         spin_unlock_irqrestore(&dum->lock, flags);
1009         return rc;
1010 }
1011
1012 static int dummy_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
1013 {
1014         struct dummy    *dum;
1015         unsigned long   flags;
1016         int             rc;
1017
1018         /* giveback happens automatically in timer callback,
1019          * so make sure the callback happens */
1020         dum = hcd_to_dummy (hcd);
1021         spin_lock_irqsave (&dum->lock, flags);
1022
1023         rc = usb_hcd_check_unlink_urb(hcd, urb, status);
1024         if (!rc && dum->rh_state != DUMMY_RH_RUNNING &&
1025                         !list_empty(&dum->urbp_list))
1026                 mod_timer (&dum->timer, jiffies);
1027
1028         spin_unlock_irqrestore (&dum->lock, flags);
1029         return rc;
1030 }
1031
1032 /* transfer up to a frame's worth; caller must own lock */
1033 static int
1034 transfer(struct dummy *dum, struct urb *urb, struct dummy_ep *ep, int limit,
1035                 int *status)
1036 {
1037         struct dummy_request    *req;
1038
1039 top:
1040         /* if there's no request queued, the device is NAKing; return */
1041         list_for_each_entry (req, &ep->queue, queue) {
1042                 unsigned        host_len, dev_len, len;
1043                 int             is_short, to_host;
1044                 int             rescan = 0;
1045
1046                 /* 1..N packets of ep->ep.maxpacket each ... the last one
1047                  * may be short (including zero length).
1048                  *
1049                  * writer can send a zlp explicitly (length 0) or implicitly
1050                  * (length mod maxpacket zero, and 'zero' flag); they always
1051                  * terminate reads.
1052                  */
1053                 host_len = urb->transfer_buffer_length - urb->actual_length;
1054                 dev_len = req->req.length - req->req.actual;
1055                 len = min (host_len, dev_len);
1056
1057                 /* FIXME update emulated data toggle too */
1058
1059                 to_host = usb_pipein (urb->pipe);
1060                 if (unlikely (len == 0))
1061                         is_short = 1;
1062                 else {
1063                         char            *ubuf, *rbuf;
1064
1065                         /* not enough bandwidth left? */
1066                         if (limit < ep->ep.maxpacket && limit < len)
1067                                 break;
1068                         len = min (len, (unsigned) limit);
1069                         if (len == 0)
1070                                 break;
1071
1072                         /* use an extra pass for the final short packet */
1073                         if (len > ep->ep.maxpacket) {
1074                                 rescan = 1;
1075                                 len -= (len % ep->ep.maxpacket);
1076                         }
1077                         is_short = (len % ep->ep.maxpacket) != 0;
1078
1079                         /* else transfer packet(s) */
1080                         ubuf = urb->transfer_buffer + urb->actual_length;
1081                         rbuf = req->req.buf + req->req.actual;
1082                         if (to_host)
1083                                 memcpy (ubuf, rbuf, len);
1084                         else
1085                                 memcpy (rbuf, ubuf, len);
1086                         ep->last_io = jiffies;
1087
1088                         limit -= len;
1089                         urb->actual_length += len;
1090                         req->req.actual += len;
1091                 }
1092
1093                 /* short packets terminate, maybe with overflow/underflow.
1094                  * it's only really an error to write too much.
1095                  *
1096                  * partially filling a buffer optionally blocks queue advances
1097                  * (so completion handlers can clean up the queue) but we don't
1098                  * need to emulate such data-in-flight.
1099                  */
1100                 if (is_short) {
1101                         if (host_len == dev_len) {
1102                                 req->req.status = 0;
1103                                 *status = 0;
1104                         } else if (to_host) {
1105                                 req->req.status = 0;
1106                                 if (dev_len > host_len)
1107                                         *status = -EOVERFLOW;
1108                                 else
1109                                         *status = 0;
1110                         } else if (!to_host) {
1111                                 *status = 0;
1112                                 if (host_len > dev_len)
1113                                         req->req.status = -EOVERFLOW;
1114                                 else
1115                                         req->req.status = 0;
1116                         }
1117
1118                 /* many requests terminate without a short packet */
1119                 } else {
1120                         if (req->req.length == req->req.actual
1121                                         && !req->req.zero)
1122                                 req->req.status = 0;
1123                         if (urb->transfer_buffer_length == urb->actual_length
1124                                         && !(urb->transfer_flags
1125                                                 & URB_ZERO_PACKET))
1126                                 *status = 0;
1127                 }
1128
1129                 /* device side completion --> continuable */
1130                 if (req->req.status != -EINPROGRESS) {
1131                         list_del_init (&req->queue);
1132
1133                         spin_unlock (&dum->lock);
1134                         req->req.complete (&ep->ep, &req->req);
1135                         spin_lock (&dum->lock);
1136
1137                         /* requests might have been unlinked... */
1138                         rescan = 1;
1139                 }
1140
1141                 /* host side completion --> terminate */
1142                 if (*status != -EINPROGRESS)
1143                         break;
1144
1145                 /* rescan to continue with any other queued i/o */
1146                 if (rescan)
1147                         goto top;
1148         }
1149         return limit;
1150 }
1151
1152 static int periodic_bytes (struct dummy *dum, struct dummy_ep *ep)
1153 {
1154         int     limit = ep->ep.maxpacket;
1155
1156         if (dum->gadget.speed == USB_SPEED_HIGH) {
1157                 int     tmp;
1158
1159                 /* high bandwidth mode */
1160                 tmp = le16_to_cpu(ep->desc->wMaxPacketSize);
1161                 tmp = (tmp >> 11) & 0x03;
1162                 tmp *= 8 /* applies to entire frame */;
1163                 limit += limit * tmp;
1164         }
1165         return limit;
1166 }
1167
1168 #define is_active(dum)  ((dum->port_status & \
1169                 (USB_PORT_STAT_CONNECTION | USB_PORT_STAT_ENABLE | \
1170                         USB_PORT_STAT_SUSPEND)) \
1171                 == (USB_PORT_STAT_CONNECTION | USB_PORT_STAT_ENABLE))
1172
1173 static struct dummy_ep *find_endpoint (struct dummy *dum, u8 address)
1174 {
1175         int             i;
1176
1177         if (!is_active (dum))
1178                 return NULL;
1179         if ((address & ~USB_DIR_IN) == 0)
1180                 return &dum->ep [0];
1181         for (i = 1; i < DUMMY_ENDPOINTS; i++) {
1182                 struct dummy_ep *ep = &dum->ep [i];
1183
1184                 if (!ep->desc)
1185                         continue;
1186                 if (ep->desc->bEndpointAddress == address)
1187                         return ep;
1188         }
1189         return NULL;
1190 }
1191
1192 #undef is_active
1193
1194 #define Dev_Request     (USB_TYPE_STANDARD | USB_RECIP_DEVICE)
1195 #define Dev_InRequest   (Dev_Request | USB_DIR_IN)
1196 #define Intf_Request    (USB_TYPE_STANDARD | USB_RECIP_INTERFACE)
1197 #define Intf_InRequest  (Intf_Request | USB_DIR_IN)
1198 #define Ep_Request      (USB_TYPE_STANDARD | USB_RECIP_ENDPOINT)
1199 #define Ep_InRequest    (Ep_Request | USB_DIR_IN)
1200
1201
1202 /**
1203  * handle_control_request() - handles all control transfers
1204  * @dum: pointer to dummy (the_controller)
1205  * @urb: the urb request to handle
1206  * @setup: pointer to the setup data for a USB device control
1207  *       request
1208  * @status: pointer to request handling status
1209  *
1210  * Return 0 - if the request was handled
1211  *        1 - if the request wasn't handles
1212  *        error code on error
1213  */
1214 static int handle_control_request(struct dummy *dum, struct urb *urb,
1215                                   struct usb_ctrlrequest *setup,
1216                                   int *status)
1217 {
1218         struct dummy_ep         *ep2;
1219         int                     ret_val = 1;
1220         unsigned        w_index;
1221         unsigned        w_value;
1222
1223         w_index = le16_to_cpu(setup->wIndex);
1224         w_value = le16_to_cpu(setup->wValue);
1225         switch (setup->bRequest) {
1226         case USB_REQ_SET_ADDRESS:
1227                 if (setup->bRequestType != Dev_Request)
1228                         break;
1229                 dum->address = w_value;
1230                 *status = 0;
1231                 dev_dbg(udc_dev(dum), "set_address = %d\n",
1232                                 w_value);
1233                 ret_val = 0;
1234                 break;
1235         case USB_REQ_SET_FEATURE:
1236                 if (setup->bRequestType == Dev_Request) {
1237                         ret_val = 0;
1238                         switch (w_value) {
1239                         case USB_DEVICE_REMOTE_WAKEUP:
1240                                 break;
1241                         case USB_DEVICE_B_HNP_ENABLE:
1242                                 dum->gadget.b_hnp_enable = 1;
1243                                 break;
1244                         case USB_DEVICE_A_HNP_SUPPORT:
1245                                 dum->gadget.a_hnp_support = 1;
1246                                 break;
1247                         case USB_DEVICE_A_ALT_HNP_SUPPORT:
1248                                 dum->gadget.a_alt_hnp_support = 1;
1249                                 break;
1250                         default:
1251                                 ret_val = -EOPNOTSUPP;
1252                         }
1253                         if (ret_val == 0) {
1254                                 dum->devstatus |= (1 << w_value);
1255                                 *status = 0;
1256                         }
1257                 } else if (setup->bRequestType == Ep_Request) {
1258                         /* endpoint halt */
1259                         ep2 = find_endpoint(dum, w_index);
1260                         if (!ep2 || ep2->ep.name == ep0name) {
1261                                 ret_val = -EOPNOTSUPP;
1262                                 break;
1263                         }
1264                         ep2->halted = 1;
1265                         ret_val = 0;
1266                         *status = 0;
1267                 }
1268                 break;
1269         case USB_REQ_CLEAR_FEATURE:
1270                 if (setup->bRequestType == Dev_Request) {
1271                         ret_val = 0;
1272                         switch (w_value) {
1273                         case USB_DEVICE_REMOTE_WAKEUP:
1274                                 w_value = USB_DEVICE_REMOTE_WAKEUP;
1275                                 break;
1276                         default:
1277                                 ret_val = -EOPNOTSUPP;
1278                                 break;
1279                         }
1280                         if (ret_val == 0) {
1281                                 dum->devstatus &= ~(1 << w_value);
1282                                 *status = 0;
1283                         }
1284                 } else if (setup->bRequestType == Ep_Request) {
1285                         /* endpoint halt */
1286                         ep2 = find_endpoint(dum, w_index);
1287                         if (!ep2) {
1288                                 ret_val = -EOPNOTSUPP;
1289                                 break;
1290                         }
1291                         if (!ep2->wedged)
1292                                 ep2->halted = 0;
1293                         ret_val = 0;
1294                         *status = 0;
1295                 }
1296                 break;
1297         case USB_REQ_GET_STATUS:
1298                 if (setup->bRequestType == Dev_InRequest
1299                                 || setup->bRequestType == Intf_InRequest
1300                                 || setup->bRequestType == Ep_InRequest) {
1301                         char *buf;
1302                         /*
1303                          * device: remote wakeup, selfpowered
1304                          * interface: nothing
1305                          * endpoint: halt
1306                          */
1307                         buf = (char *)urb->transfer_buffer;
1308                         if (urb->transfer_buffer_length > 0) {
1309                                 if (setup->bRequestType == Ep_InRequest) {
1310                                         ep2 = find_endpoint(dum, w_index);
1311                                         if (!ep2) {
1312                                                 ret_val = -EOPNOTSUPP;
1313                                                 break;
1314                                         }
1315                                         buf[0] = ep2->halted;
1316                                 } else if (setup->bRequestType ==
1317                                            Dev_InRequest) {
1318                                         buf[0] = (u8)dum->devstatus;
1319                                 } else
1320                                         buf[0] = 0;
1321                         }
1322                         if (urb->transfer_buffer_length > 1)
1323                                 buf[1] = 0;
1324                         urb->actual_length = min_t(u32, 2,
1325                                 urb->transfer_buffer_length);
1326                         ret_val = 0;
1327                         *status = 0;
1328                 }
1329                 break;
1330         }
1331         return ret_val;
1332 }
1333
1334 /* drive both sides of the transfers; looks like irq handlers to
1335  * both drivers except the callbacks aren't in_irq().
1336  */
1337 static void dummy_timer (unsigned long _dum)
1338 {
1339         struct dummy            *dum = (struct dummy *) _dum;
1340         struct urbp             *urbp, *tmp;
1341         unsigned long           flags;
1342         int                     limit, total;
1343         int                     i;
1344
1345         /* simplistic model for one frame's bandwidth */
1346         switch (dum->gadget.speed) {
1347         case USB_SPEED_LOW:
1348                 total = 8/*bytes*/ * 12/*packets*/;
1349                 break;
1350         case USB_SPEED_FULL:
1351                 total = 64/*bytes*/ * 19/*packets*/;
1352                 break;
1353         case USB_SPEED_HIGH:
1354                 total = 512/*bytes*/ * 13/*packets*/ * 8/*uframes*/;
1355                 break;
1356         default:
1357                 dev_err (dummy_dev(dum), "bogus device speed\n");
1358                 return;
1359         }
1360
1361         /* FIXME if HZ != 1000 this will probably misbehave ... */
1362
1363         /* look at each urb queued by the host side driver */
1364         spin_lock_irqsave (&dum->lock, flags);
1365
1366         if (!dum->udev) {
1367                 dev_err (dummy_dev(dum),
1368                                 "timer fired with no URBs pending?\n");
1369                 spin_unlock_irqrestore (&dum->lock, flags);
1370                 return;
1371         }
1372
1373         for (i = 0; i < DUMMY_ENDPOINTS; i++) {
1374                 if (!ep_name [i])
1375                         break;
1376                 dum->ep [i].already_seen = 0;
1377         }
1378
1379 restart:
1380         list_for_each_entry_safe (urbp, tmp, &dum->urbp_list, urbp_list) {
1381                 struct urb              *urb;
1382                 struct dummy_request    *req;
1383                 u8                      address;
1384                 struct dummy_ep         *ep = NULL;
1385                 int                     type;
1386                 int                     status = -EINPROGRESS;
1387
1388                 urb = urbp->urb;
1389                 if (urb->unlinked)
1390                         goto return_urb;
1391                 else if (dum->rh_state != DUMMY_RH_RUNNING)
1392                         continue;
1393                 type = usb_pipetype (urb->pipe);
1394
1395                 /* used up this frame's non-periodic bandwidth?
1396                  * FIXME there's infinite bandwidth for control and
1397                  * periodic transfers ... unrealistic.
1398                  */
1399                 if (total <= 0 && type == PIPE_BULK)
1400                         continue;
1401
1402                 /* find the gadget's ep for this request (if configured) */
1403                 address = usb_pipeendpoint (urb->pipe);
1404                 if (usb_pipein (urb->pipe))
1405                         address |= USB_DIR_IN;
1406                 ep = find_endpoint(dum, address);
1407                 if (!ep) {
1408                         /* set_configuration() disagreement */
1409                         dev_dbg (dummy_dev(dum),
1410                                 "no ep configured for urb %p\n",
1411                                 urb);
1412                         status = -EPROTO;
1413                         goto return_urb;
1414                 }
1415
1416                 if (ep->already_seen)
1417                         continue;
1418                 ep->already_seen = 1;
1419                 if (ep == &dum->ep [0] && urb->error_count) {
1420                         ep->setup_stage = 1;    /* a new urb */
1421                         urb->error_count = 0;
1422                 }
1423                 if (ep->halted && !ep->setup_stage) {
1424                         /* NOTE: must not be iso! */
1425                         dev_dbg (dummy_dev(dum), "ep %s halted, urb %p\n",
1426                                         ep->ep.name, urb);
1427                         status = -EPIPE;
1428                         goto return_urb;
1429                 }
1430                 /* FIXME make sure both ends agree on maxpacket */
1431
1432                 /* handle control requests */
1433                 if (ep == &dum->ep [0] && ep->setup_stage) {
1434                         struct usb_ctrlrequest          setup;
1435                         int                             value = 1;
1436
1437                         setup = *(struct usb_ctrlrequest*) urb->setup_packet;
1438                         /* paranoia, in case of stale queued data */
1439                         list_for_each_entry (req, &ep->queue, queue) {
1440                                 list_del_init (&req->queue);
1441                                 req->req.status = -EOVERFLOW;
1442                                 dev_dbg (udc_dev(dum), "stale req = %p\n",
1443                                                 req);
1444
1445                                 spin_unlock (&dum->lock);
1446                                 req->req.complete (&ep->ep, &req->req);
1447                                 spin_lock (&dum->lock);
1448                                 ep->already_seen = 0;
1449                                 goto restart;
1450                         }
1451
1452                         /* gadget driver never sees set_address or operations
1453                          * on standard feature flags.  some hardware doesn't
1454                          * even expose them.
1455                          */
1456                         ep->last_io = jiffies;
1457                         ep->setup_stage = 0;
1458                         ep->halted = 0;
1459
1460                         value = handle_control_request(dum, urb, &setup,
1461                                                        &status);
1462
1463                         /* gadget driver handles all other requests.  block
1464                          * until setup() returns; no reentrancy issues etc.
1465                          */
1466                         if (value > 0) {
1467                                 spin_unlock (&dum->lock);
1468                                 value = dum->driver->setup (&dum->gadget,
1469                                                 &setup);
1470                                 spin_lock (&dum->lock);
1471
1472                                 if (value >= 0) {
1473                                         /* no delays (max 64KB data stage) */
1474                                         limit = 64*1024;
1475                                         goto treat_control_like_bulk;
1476                                 }
1477                                 /* error, see below */
1478                         }
1479
1480                         if (value < 0) {
1481                                 if (value != -EOPNOTSUPP)
1482                                         dev_dbg (udc_dev(dum),
1483                                                 "setup --> %d\n",
1484                                                 value);
1485                                 status = -EPIPE;
1486                                 urb->actual_length = 0;
1487                         }
1488
1489                         goto return_urb;
1490                 }
1491
1492                 /* non-control requests */
1493                 limit = total;
1494                 switch (usb_pipetype (urb->pipe)) {
1495                 case PIPE_ISOCHRONOUS:
1496                         /* FIXME is it urb->interval since the last xfer?
1497                          * use urb->iso_frame_desc[i].
1498                          * complete whether or not ep has requests queued.
1499                          * report random errors, to debug drivers.
1500                          */
1501                         limit = max (limit, periodic_bytes (dum, ep));
1502                         status = -ENOSYS;
1503                         break;
1504
1505                 case PIPE_INTERRUPT:
1506                         /* FIXME is it urb->interval since the last xfer?
1507                          * this almost certainly polls too fast.
1508                          */
1509                         limit = max (limit, periodic_bytes (dum, ep));
1510                         /* FALLTHROUGH */
1511
1512                 // case PIPE_BULK:  case PIPE_CONTROL:
1513                 default:
1514                 treat_control_like_bulk:
1515                         ep->last_io = jiffies;
1516                         total = transfer(dum, urb, ep, limit, &status);
1517                         break;
1518                 }
1519
1520                 /* incomplete transfer? */
1521                 if (status == -EINPROGRESS)
1522                         continue;
1523
1524 return_urb:
1525                 list_del (&urbp->urbp_list);
1526                 kfree (urbp);
1527                 if (ep)
1528                         ep->already_seen = ep->setup_stage = 0;
1529
1530                 usb_hcd_unlink_urb_from_ep(dummy_to_hcd(dum), urb);
1531                 spin_unlock (&dum->lock);
1532                 usb_hcd_giveback_urb(dummy_to_hcd(dum), urb, status);
1533                 spin_lock (&dum->lock);
1534
1535                 goto restart;
1536         }
1537
1538         if (list_empty (&dum->urbp_list)) {
1539                 usb_put_dev (dum->udev);
1540                 dum->udev = NULL;
1541         } else if (dum->rh_state == DUMMY_RH_RUNNING) {
1542                 /* want a 1 msec delay here */
1543                 mod_timer (&dum->timer, jiffies + msecs_to_jiffies(1));
1544         }
1545
1546         spin_unlock_irqrestore (&dum->lock, flags);
1547 }
1548
1549 /*-------------------------------------------------------------------------*/
1550
1551 #define PORT_C_MASK \
1552         ((USB_PORT_STAT_C_CONNECTION \
1553         | USB_PORT_STAT_C_ENABLE \
1554         | USB_PORT_STAT_C_SUSPEND \
1555         | USB_PORT_STAT_C_OVERCURRENT \
1556         | USB_PORT_STAT_C_RESET) << 16)
1557
1558 static int dummy_hub_status (struct usb_hcd *hcd, char *buf)
1559 {
1560         struct dummy            *dum;
1561         unsigned long           flags;
1562         int                     retval = 0;
1563
1564         dum = hcd_to_dummy (hcd);
1565
1566         spin_lock_irqsave (&dum->lock, flags);
1567         if (!HCD_HW_ACCESSIBLE(hcd))
1568                 goto done;
1569
1570         if (dum->resuming && time_after_eq (jiffies, dum->re_timeout)) {
1571                 dum->port_status |= (USB_PORT_STAT_C_SUSPEND << 16);
1572                 dum->port_status &= ~USB_PORT_STAT_SUSPEND;
1573                 set_link_state (dum);
1574         }
1575
1576         if ((dum->port_status & PORT_C_MASK) != 0) {
1577                 *buf = (1 << 1);
1578                 dev_dbg (dummy_dev(dum), "port status 0x%08x has changes\n",
1579                                 dum->port_status);
1580                 retval = 1;
1581                 if (dum->rh_state == DUMMY_RH_SUSPENDED)
1582                         usb_hcd_resume_root_hub (hcd);
1583         }
1584 done:
1585         spin_unlock_irqrestore (&dum->lock, flags);
1586         return retval;
1587 }
1588
1589 static inline void
1590 hub_descriptor (struct usb_hub_descriptor *desc)
1591 {
1592         memset (desc, 0, sizeof *desc);
1593         desc->bDescriptorType = 0x29;
1594         desc->bDescLength = 9;
1595         desc->wHubCharacteristics = cpu_to_le16(0x0001);
1596         desc->bNbrPorts = 1;
1597         desc->u.hs.DeviceRemovable[0] = 0xff;
1598         desc->u.hs.DeviceRemovable[1] = 0xff;
1599 }
1600
1601 static int dummy_hub_control (
1602         struct usb_hcd  *hcd,
1603         u16             typeReq,
1604         u16             wValue,
1605         u16             wIndex,
1606         char            *buf,
1607         u16             wLength
1608 ) {
1609         struct dummy    *dum;
1610         int             retval = 0;
1611         unsigned long   flags;
1612
1613         if (!HCD_HW_ACCESSIBLE(hcd))
1614                 return -ETIMEDOUT;
1615
1616         dum = hcd_to_dummy (hcd);
1617         spin_lock_irqsave (&dum->lock, flags);
1618         switch (typeReq) {
1619         case ClearHubFeature:
1620                 break;
1621         case ClearPortFeature:
1622                 switch (wValue) {
1623                 case USB_PORT_FEAT_SUSPEND:
1624                         if (dum->port_status & USB_PORT_STAT_SUSPEND) {
1625                                 /* 20msec resume signaling */
1626                                 dum->resuming = 1;
1627                                 dum->re_timeout = jiffies +
1628                                                 msecs_to_jiffies(20);
1629                         }
1630                         break;
1631                 case USB_PORT_FEAT_POWER:
1632                         if (dum->port_status & USB_PORT_STAT_POWER)
1633                                 dev_dbg (dummy_dev(dum), "power-off\n");
1634                         /* FALLS THROUGH */
1635                 default:
1636                         dum->port_status &= ~(1 << wValue);
1637                         set_link_state (dum);
1638                 }
1639                 break;
1640         case GetHubDescriptor:
1641                 hub_descriptor ((struct usb_hub_descriptor *) buf);
1642                 break;
1643         case GetHubStatus:
1644                 *(__le32 *) buf = cpu_to_le32 (0);
1645                 break;
1646         case GetPortStatus:
1647                 if (wIndex != 1)
1648                         retval = -EPIPE;
1649
1650                 /* whoever resets or resumes must GetPortStatus to
1651                  * complete it!!
1652                  */
1653                 if (dum->resuming &&
1654                                 time_after_eq (jiffies, dum->re_timeout)) {
1655                         dum->port_status |= (USB_PORT_STAT_C_SUSPEND << 16);
1656                         dum->port_status &= ~USB_PORT_STAT_SUSPEND;
1657                 }
1658                 if ((dum->port_status & USB_PORT_STAT_RESET) != 0 &&
1659                                 time_after_eq (jiffies, dum->re_timeout)) {
1660                         dum->port_status |= (USB_PORT_STAT_C_RESET << 16);
1661                         dum->port_status &= ~USB_PORT_STAT_RESET;
1662                         if (dum->pullup) {
1663                                 dum->port_status |= USB_PORT_STAT_ENABLE;
1664                                 /* give it the best speed we agree on */
1665                                 dum->gadget.speed = dum->driver->speed;
1666                                 dum->gadget.ep0->maxpacket = 64;
1667                                 switch (dum->gadget.speed) {
1668                                 case USB_SPEED_HIGH:
1669                                         dum->port_status |=
1670                                                 USB_PORT_STAT_HIGH_SPEED;
1671                                         break;
1672                                 case USB_SPEED_LOW:
1673                                         dum->gadget.ep0->maxpacket = 8;
1674                                         dum->port_status |=
1675                                                 USB_PORT_STAT_LOW_SPEED;
1676                                         break;
1677                                 default:
1678                                         dum->gadget.speed = USB_SPEED_FULL;
1679                                         break;
1680                                 }
1681                         }
1682                 }
1683                 set_link_state (dum);
1684                 ((__le16 *) buf)[0] = cpu_to_le16 (dum->port_status);
1685                 ((__le16 *) buf)[1] = cpu_to_le16 (dum->port_status >> 16);
1686                 break;
1687         case SetHubFeature:
1688                 retval = -EPIPE;
1689                 break;
1690         case SetPortFeature:
1691                 switch (wValue) {
1692                 case USB_PORT_FEAT_SUSPEND:
1693                         if (dum->active) {
1694                                 dum->port_status |= USB_PORT_STAT_SUSPEND;
1695
1696                                 /* HNP would happen here; for now we
1697                                  * assume b_bus_req is always true.
1698                                  */
1699                                 set_link_state (dum);
1700                                 if (((1 << USB_DEVICE_B_HNP_ENABLE)
1701                                                 & dum->devstatus) != 0)
1702                                         dev_dbg (dummy_dev(dum),
1703                                                         "no HNP yet!\n");
1704                         }
1705                         break;
1706                 case USB_PORT_FEAT_POWER:
1707                         dum->port_status |= USB_PORT_STAT_POWER;
1708                         set_link_state (dum);
1709                         break;
1710                 case USB_PORT_FEAT_RESET:
1711                         /* if it's already enabled, disable */
1712                         dum->port_status &= ~(USB_PORT_STAT_ENABLE
1713                                         | USB_PORT_STAT_LOW_SPEED
1714                                         | USB_PORT_STAT_HIGH_SPEED);
1715                         dum->devstatus = 0;
1716                         /* 50msec reset signaling */
1717                         dum->re_timeout = jiffies + msecs_to_jiffies(50);
1718                         /* FALLS THROUGH */
1719                 default:
1720                         if ((dum->port_status & USB_PORT_STAT_POWER) != 0) {
1721                                 dum->port_status |= (1 << wValue);
1722                                 set_link_state (dum);
1723                         }
1724                 }
1725                 break;
1726
1727         default:
1728                 dev_dbg (dummy_dev(dum),
1729                         "hub control req%04x v%04x i%04x l%d\n",
1730                         typeReq, wValue, wIndex, wLength);
1731
1732                 /* "protocol stall" on error */
1733                 retval = -EPIPE;
1734         }
1735         spin_unlock_irqrestore (&dum->lock, flags);
1736
1737         if ((dum->port_status & PORT_C_MASK) != 0)
1738                 usb_hcd_poll_rh_status (hcd);
1739         return retval;
1740 }
1741
1742 static int dummy_bus_suspend (struct usb_hcd *hcd)
1743 {
1744         struct dummy *dum = hcd_to_dummy (hcd);
1745
1746         dev_dbg (&hcd->self.root_hub->dev, "%s\n", __func__);
1747
1748         spin_lock_irq (&dum->lock);
1749         dum->rh_state = DUMMY_RH_SUSPENDED;
1750         set_link_state (dum);
1751         hcd->state = HC_STATE_SUSPENDED;
1752         spin_unlock_irq (&dum->lock);
1753         return 0;
1754 }
1755
1756 static int dummy_bus_resume (struct usb_hcd *hcd)
1757 {
1758         struct dummy *dum = hcd_to_dummy (hcd);
1759         int rc = 0;
1760
1761         dev_dbg (&hcd->self.root_hub->dev, "%s\n", __func__);
1762
1763         spin_lock_irq (&dum->lock);
1764         if (!HCD_HW_ACCESSIBLE(hcd)) {
1765                 rc = -ESHUTDOWN;
1766         } else {
1767                 dum->rh_state = DUMMY_RH_RUNNING;
1768                 set_link_state (dum);
1769                 if (!list_empty(&dum->urbp_list))
1770                         mod_timer (&dum->timer, jiffies);
1771                 hcd->state = HC_STATE_RUNNING;
1772         }
1773         spin_unlock_irq (&dum->lock);
1774         return rc;
1775 }
1776
1777 /*-------------------------------------------------------------------------*/
1778
1779 static inline ssize_t
1780 show_urb (char *buf, size_t size, struct urb *urb)
1781 {
1782         int ep = usb_pipeendpoint (urb->pipe);
1783
1784         return snprintf (buf, size,
1785                 "urb/%p %s ep%d%s%s len %d/%d\n",
1786                 urb,
1787                 ({ char *s;
1788                  switch (urb->dev->speed) {
1789                  case USB_SPEED_LOW:    s = "ls"; break;
1790                  case USB_SPEED_FULL:   s = "fs"; break;
1791                  case USB_SPEED_HIGH:   s = "hs"; break;
1792                  default:               s = "?"; break;
1793                  }; s; }),
1794                 ep, ep ? (usb_pipein (urb->pipe) ? "in" : "out") : "",
1795                 ({ char *s; \
1796                  switch (usb_pipetype (urb->pipe)) { \
1797                  case PIPE_CONTROL:     s = ""; break; \
1798                  case PIPE_BULK:        s = "-bulk"; break; \
1799                  case PIPE_INTERRUPT:   s = "-int"; break; \
1800                  default:               s = "-iso"; break; \
1801                 }; s;}),
1802                 urb->actual_length, urb->transfer_buffer_length);
1803 }
1804
1805 static ssize_t
1806 show_urbs (struct device *dev, struct device_attribute *attr, char *buf)
1807 {
1808         struct usb_hcd          *hcd = dev_get_drvdata (dev);
1809         struct dummy            *dum = hcd_to_dummy (hcd);
1810         struct urbp             *urbp;
1811         size_t                  size = 0;
1812         unsigned long           flags;
1813
1814         spin_lock_irqsave (&dum->lock, flags);
1815         list_for_each_entry (urbp, &dum->urbp_list, urbp_list) {
1816                 size_t          temp;
1817
1818                 temp = show_urb (buf, PAGE_SIZE - size, urbp->urb);
1819                 buf += temp;
1820                 size += temp;
1821         }
1822         spin_unlock_irqrestore (&dum->lock, flags);
1823
1824         return size;
1825 }
1826 static DEVICE_ATTR (urbs, S_IRUGO, show_urbs, NULL);
1827
1828 static int dummy_start (struct usb_hcd *hcd)
1829 {
1830         struct dummy            *dum;
1831
1832         dum = hcd_to_dummy (hcd);
1833
1834         /*
1835          * MASTER side init ... we emulate a root hub that'll only ever
1836          * talk to one device (the slave side).  Also appears in sysfs,
1837          * just like more familiar pci-based HCDs.
1838          */
1839         spin_lock_init (&dum->lock);
1840         init_timer (&dum->timer);
1841         dum->timer.function = dummy_timer;
1842         dum->timer.data = (unsigned long) dum;
1843         dum->rh_state = DUMMY_RH_RUNNING;
1844
1845         INIT_LIST_HEAD (&dum->urbp_list);
1846
1847         hcd->power_budget = POWER_BUDGET;
1848         hcd->state = HC_STATE_RUNNING;
1849         hcd->uses_new_polling = 1;
1850
1851 #ifdef CONFIG_USB_OTG
1852         hcd->self.otg_port = 1;
1853 #endif
1854
1855         /* FIXME 'urbs' should be a per-device thing, maybe in usbcore */
1856         return device_create_file (dummy_dev(dum), &dev_attr_urbs);
1857 }
1858
1859 static void dummy_stop (struct usb_hcd *hcd)
1860 {
1861         struct dummy            *dum;
1862
1863         dum = hcd_to_dummy (hcd);
1864
1865         device_remove_file (dummy_dev(dum), &dev_attr_urbs);
1866         usb_gadget_unregister_driver (dum->driver);
1867         dev_info (dummy_dev(dum), "stopped\n");
1868 }
1869
1870 /*-------------------------------------------------------------------------*/
1871
1872 static int dummy_h_get_frame (struct usb_hcd *hcd)
1873 {
1874         return dummy_g_get_frame (NULL);
1875 }
1876
1877 static const struct hc_driver dummy_hcd = {
1878         .description =          (char *) driver_name,
1879         .product_desc =         "Dummy host controller",
1880         .hcd_priv_size =        sizeof(struct dummy),
1881
1882         .flags =                HCD_USB2,
1883
1884         .start =                dummy_start,
1885         .stop =                 dummy_stop,
1886
1887         .urb_enqueue =          dummy_urb_enqueue,
1888         .urb_dequeue =          dummy_urb_dequeue,
1889
1890         .get_frame_number =     dummy_h_get_frame,
1891
1892         .hub_status_data =      dummy_hub_status,
1893         .hub_control =          dummy_hub_control,
1894         .bus_suspend =          dummy_bus_suspend,
1895         .bus_resume =           dummy_bus_resume,
1896 };
1897
1898 static int dummy_hcd_probe(struct platform_device *pdev)
1899 {
1900         struct usb_hcd          *hcd;
1901         int                     retval;
1902
1903         dev_info(&pdev->dev, "%s, driver " DRIVER_VERSION "\n", driver_desc);
1904
1905         hcd = usb_create_hcd(&dummy_hcd, &pdev->dev, dev_name(&pdev->dev));
1906         if (!hcd)
1907                 return -ENOMEM;
1908         the_controller = hcd_to_dummy (hcd);
1909         hcd->has_tt = 1;
1910
1911         retval = usb_add_hcd(hcd, 0, 0);
1912         if (retval != 0) {
1913                 usb_put_hcd (hcd);
1914                 the_controller = NULL;
1915         }
1916         return retval;
1917 }
1918
1919 static int dummy_hcd_remove (struct platform_device *pdev)
1920 {
1921         struct usb_hcd          *hcd;
1922
1923         hcd = platform_get_drvdata (pdev);
1924         usb_remove_hcd (hcd);
1925         usb_put_hcd (hcd);
1926         the_controller = NULL;
1927         return 0;
1928 }
1929
1930 static int dummy_hcd_suspend (struct platform_device *pdev, pm_message_t state)
1931 {
1932         struct usb_hcd          *hcd;
1933         struct dummy            *dum;
1934         int                     rc = 0;
1935
1936         dev_dbg (&pdev->dev, "%s\n", __func__);
1937
1938         hcd = platform_get_drvdata (pdev);
1939         dum = hcd_to_dummy (hcd);
1940         if (dum->rh_state == DUMMY_RH_RUNNING) {
1941                 dev_warn(&pdev->dev, "Root hub isn't suspended!\n");
1942                 rc = -EBUSY;
1943         } else
1944                 clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
1945         return rc;
1946 }
1947
1948 static int dummy_hcd_resume (struct platform_device *pdev)
1949 {
1950         struct usb_hcd          *hcd;
1951
1952         dev_dbg (&pdev->dev, "%s\n", __func__);
1953
1954         hcd = platform_get_drvdata (pdev);
1955         set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
1956         usb_hcd_poll_rh_status (hcd);
1957         return 0;
1958 }
1959
1960 static struct platform_driver dummy_hcd_driver = {
1961         .probe          = dummy_hcd_probe,
1962         .remove         = dummy_hcd_remove,
1963         .suspend        = dummy_hcd_suspend,
1964         .resume         = dummy_hcd_resume,
1965         .driver         = {
1966                 .name   = (char *) driver_name,
1967                 .owner  = THIS_MODULE,
1968         },
1969 };
1970
1971 /*-------------------------------------------------------------------------*/
1972
1973 static struct platform_device *the_udc_pdev;
1974 static struct platform_device *the_hcd_pdev;
1975
1976 static int __init init (void)
1977 {
1978         int     retval = -ENOMEM;
1979
1980         if (usb_disabled ())
1981                 return -ENODEV;
1982
1983         the_hcd_pdev = platform_device_alloc(driver_name, -1);
1984         if (!the_hcd_pdev)
1985                 return retval;
1986         the_udc_pdev = platform_device_alloc(gadget_name, -1);
1987         if (!the_udc_pdev)
1988                 goto err_alloc_udc;
1989
1990         retval = platform_driver_register(&dummy_hcd_driver);
1991         if (retval < 0)
1992                 goto err_register_hcd_driver;
1993         retval = platform_driver_register(&dummy_udc_driver);
1994         if (retval < 0)
1995                 goto err_register_udc_driver;
1996
1997         retval = platform_device_add(the_hcd_pdev);
1998         if (retval < 0)
1999                 goto err_add_hcd;
2000         if (!the_controller) {
2001                 /*
2002                  * The hcd was added successfully but its probe function failed
2003                  * for some reason.
2004                  */
2005                 retval = -EINVAL;
2006                 goto err_add_udc;
2007         }
2008         retval = platform_device_add(the_udc_pdev);
2009         if (retval < 0)
2010                 goto err_add_udc;
2011         if (!platform_get_drvdata(the_udc_pdev)) {
2012                 /*
2013                  * The udc was added successfully but its probe function failed
2014                  * for some reason.
2015                  */
2016                 retval = -EINVAL;
2017                 goto err_probe_udc;
2018         }
2019         return retval;
2020
2021 err_probe_udc:
2022         platform_device_del(the_udc_pdev);
2023 err_add_udc:
2024         platform_device_del(the_hcd_pdev);
2025 err_add_hcd:
2026         platform_driver_unregister(&dummy_udc_driver);
2027 err_register_udc_driver:
2028         platform_driver_unregister(&dummy_hcd_driver);
2029 err_register_hcd_driver:
2030         platform_device_put(the_udc_pdev);
2031 err_alloc_udc:
2032         platform_device_put(the_hcd_pdev);
2033         return retval;
2034 }
2035 module_init (init);
2036
2037 static void __exit cleanup (void)
2038 {
2039         platform_device_unregister(the_udc_pdev);
2040         platform_device_unregister(the_hcd_pdev);
2041         platform_driver_unregister(&dummy_udc_driver);
2042         platform_driver_unregister(&dummy_hcd_driver);
2043 }
2044 module_exit (cleanup);