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/config.h>
  40 #include <linux/module.h>
  41 #include <linux/kernel.h>
  42 #include <linux/delay.h>
  43 #include <linux/ioport.h>
  44 #include <linux/sched.h>
  45 #include <linux/slab.h>
  46 #include <linux/smp_lock.h>
  47 #include <linux/errno.h>
  48 #include <linux/init.h>
  49 #include <linux/timer.h>
  50 #include <linux/list.h>
  51 #include <linux/interrupt.h>
  52 #include <linux/version.h>
  53
  54 #include <linux/usb.h>
  55 #include <linux/usb_gadget.h>
  56
  57 #include <asm/byteorder.h>
  58 #include <asm/io.h>
  59 #include <asm/irq.h>
  60 #include <asm/system.h>
  61 #include <asm/unaligned.h>
  62
  63
  64 #include "../core/hcd.h"
  65
  66
  67 #define DRIVER_DESC     "USB Host+Gadget Emulator"
  68 #define DRIVER_VERSION  "02 May 2005"
  69
  70 static const char       driver_name [] = "dummy_hcd";
  71 static const char       driver_desc [] = "USB Host+Gadget Emulator";
  72
  73 static const char       gadget_name [] = "dummy_udc";
  74
  75 MODULE_DESCRIPTION (DRIVER_DESC);
  76 MODULE_AUTHOR ("David Brownell");
  77 MODULE_LICENSE ("GPL");
  78
  79 /*-------------------------------------------------------------------------*/
  80
  81 /* gadget side driver data structres */
  82 struct dummy_ep {
  83         struct list_head                queue;
  84         unsigned long                   last_io;        /* jiffies timestamp */
  85         struct usb_gadget               *gadget;
  86         const struct usb_endpoint_descriptor *desc;
  87         struct usb_ep                   ep;
  88         unsigned                        halted : 1;
  89         unsigned                        already_seen : 1;
  90         unsigned                        setup_stage : 1;
  91 };
  92
  93 struct dummy_request {
  94         struct list_head                queue;          /* ep's requests */
  95         struct usb_request              req;
  96 };
  97
  98 static inline struct dummy_ep *usb_ep_to_dummy_ep (struct usb_ep *_ep)
  99 {
 100         return container_of (_ep, struct dummy_ep, ep);
 101 }
 102
 103 static inline struct dummy_request *usb_request_to_dummy_request
 104                 (struct usb_request *_req)
 105 {
 106         return container_of (_req, struct dummy_request, req);
 107 }
 108
 109 /*-------------------------------------------------------------------------*/
 110
 111 /*
 112  * Every device has ep0 for control requests, plus up to 30 more endpoints,
 113  * in one of two types:
 114  *
 115  *   - Configurable:  direction (in/out), type (bulk, iso, etc), and endpoint
 116  *     number can be changed.  Names like "ep-a" are used for this type.
 117  *
 118  *   - Fixed Function:  in other cases.  some characteristics may be mutable;
 119  *     that'd be hardware-specific.  Names like "ep12out-bulk" are used.
 120  *
 121  * Gadget drivers are responsible for not setting up conflicting endpoint
 122  * configurations, illegal or unsupported packet lengths, and so on.
 123  */
 124
 125 static const char ep0name [] = "ep0";
 126
 127 static const char *const ep_name [] = {
 128         ep0name,                                /* everyone has ep0 */
 129
 130         /* act like a net2280: high speed, six configurable endpoints */
 131         "ep-a", "ep-b", "ep-c", "ep-d", "ep-e", "ep-f",
 132
 133         /* or like pxa250: fifteen fixed function endpoints */
 134         "ep1in-bulk", "ep2out-bulk", "ep3in-iso", "ep4out-iso", "ep5in-int",
 135         "ep6in-bulk", "ep7out-bulk", "ep8in-iso", "ep9out-iso", "ep10in-int",
 136         "ep11in-bulk", "ep12out-bulk", "ep13in-iso", "ep14out-iso",
 137                 "ep15in-int",
 138
 139         /* or like sa1100: two fixed function endpoints */
 140         "ep1out-bulk", "ep2in-bulk",
 141 };
 142 #define DUMMY_ENDPOINTS (sizeof(ep_name)/sizeof(char *))
 143
 144 /*-------------------------------------------------------------------------*/
 145
 146 #define FIFO_SIZE               64
 147
 148 struct urbp {
 149         struct urb              *urb;
 150         struct list_head        urbp_list;
 151 };
 152
 153
 154 enum dummy_rh_state {
 155         DUMMY_RH_RESET,
 156         DUMMY_RH_SUSPENDED,
 157         DUMMY_RH_RUNNING
 158 };
 159
 160 struct dummy {
 161         spinlock_t                      lock;
 162
 163         /*
 164          * SLAVE/GADGET side support
 165          */
 166         struct dummy_ep                 ep [DUMMY_ENDPOINTS];
 167         int                             address;
 168         struct usb_gadget               gadget;
 169         struct usb_gadget_driver        *driver;
 170         struct dummy_request            fifo_req;
 171         u8                              fifo_buf [FIFO_SIZE];
 172         u16                             devstatus;
 173         unsigned                        udc_suspended:1;
 174         unsigned                        pullup:1;
 175         unsigned                        active:1;
 176         unsigned                        old_active:1;
 177
 178         /*
 179          * MASTER/HOST side support
 180          */
 181         enum dummy_rh_state             rh_state;
 182         struct timer_list               timer;
 183         u32                             port_status;
 184         u32                             old_status;
 185         unsigned                        resuming:1;
 186         unsigned long                   re_timeout;
 187
 188         struct usb_device               *udev;
 189         struct list_head                urbp_list;
 190 };
 191
 192 static inline struct dummy *hcd_to_dummy (struct usb_hcd *hcd)
 193 {
 194         return (struct dummy *) (hcd->hcd_priv);
 195 }
 196
 197 static inline struct usb_hcd *dummy_to_hcd (struct dummy *dum)
 198 {
 199         return container_of((void *) dum, struct usb_hcd, hcd_priv);
 200 }
 201
 202 static inline struct device *dummy_dev (struct dummy *dum)
 203 {
 204         return dummy_to_hcd(dum)->self.controller;
 205 }
 206
 207 static inline struct device *udc_dev (struct dummy *dum)
 208 {
 209         return dum->gadget.dev.parent;
 210 }
 211
 212 static inline struct dummy *ep_to_dummy (struct dummy_ep *ep)
 213 {
 214         return container_of (ep->gadget, struct dummy, gadget);
 215 }
 216
 217 static inline struct dummy *gadget_to_dummy (struct usb_gadget *gadget)
 218 {
 219         return container_of (gadget, struct dummy, gadget);
 220 }
 221
 222 static inline struct dummy *gadget_dev_to_dummy (struct device *dev)
 223 {
 224         return container_of (dev, struct dummy, gadget.dev);
 225 }
 226
 227 static struct dummy                     *the_controller;
 228
 229 /*-------------------------------------------------------------------------*/
 230
 231 /* SLAVE/GADGET SIDE UTILITY ROUTINES */
 232
 233 /* called with spinlock held */
 234 static void nuke (struct dummy *dum, struct dummy_ep *ep)
 235 {
 236         while (!list_empty (&ep->queue)) {
 237                 struct dummy_request    *req;
 238
 239                 req = list_entry (ep->queue.next, struct dummy_request, queue);
 240                 list_del_init (&req->queue);
 241                 req->req.status = -ESHUTDOWN;
 242
 243                 spin_unlock (&dum->lock);
 244                 req->req.complete (&ep->ep, &req->req);
 245                 spin_lock (&dum->lock);
 246         }
 247 }
 248
 249 /* caller must hold lock */
 250 static void
 251 stop_activity (struct dummy *dum)
 252 {
 253         struct dummy_ep *ep;
 254
 255         /* prevent any more requests */
 256         dum->address = 0;
 257
 258         /* The timer is left running so that outstanding URBs can fail */
 259
 260         /* nuke any pending requests first, so driver i/o is quiesced */
 261         list_for_each_entry (ep, &dum->gadget.ep_list, ep.ep_list)
 262                 nuke (dum, ep);
 263
 264         /* driver now does any non-usb quiescing necessary */
 265 }
 266
 267 /* caller must hold lock */
 268 static void
 269 set_link_state (struct dummy *dum)
 270 {
 271         dum->active = 0;
 272         if ((dum->port_status & USB_PORT_STAT_POWER) == 0)
 273                 dum->port_status = 0;
 274
 275         /* UDC suspend must cause a disconnect */
 276         else if (!dum->pullup || dum->udc_suspended) {
 277                 dum->port_status &= ~(USB_PORT_STAT_CONNECTION |
 278                                         USB_PORT_STAT_ENABLE |
 279                                         USB_PORT_STAT_LOW_SPEED |
 280                                         USB_PORT_STAT_HIGH_SPEED |
 281                                         USB_PORT_STAT_SUSPEND);
 282                 if ((dum->old_status & USB_PORT_STAT_CONNECTION) != 0)
 283                         dum->port_status |= (USB_PORT_STAT_C_CONNECTION << 16);
 284         } else {
 285                 dum->port_status |= USB_PORT_STAT_CONNECTION;
 286                 if ((dum->old_status & USB_PORT_STAT_CONNECTION) == 0)
 287                         dum->port_status |= (USB_PORT_STAT_C_CONNECTION << 16);
 288                 if ((dum->port_status & USB_PORT_STAT_ENABLE) == 0)
 289                         dum->port_status &= ~USB_PORT_STAT_SUSPEND;
 290                 else if ((dum->port_status & USB_PORT_STAT_SUSPEND) == 0 &&
 291                                 dum->rh_state != DUMMY_RH_SUSPENDED)
 292                         dum->active = 1;
 293         }
 294
 295         if ((dum->port_status & USB_PORT_STAT_ENABLE) == 0 || dum->active)
 296                 dum->resuming = 0;
 297
 298         if ((dum->port_status & USB_PORT_STAT_CONNECTION) == 0 ||
 299                         (dum->port_status & USB_PORT_STAT_RESET) != 0) {
 300                 if ((dum->old_status & USB_PORT_STAT_CONNECTION) != 0 &&
 301                                 (dum->old_status & USB_PORT_STAT_RESET) == 0 &&
 302                                 dum->driver) {
 303                         stop_activity (dum);
 304                         spin_unlock (&dum->lock);
 305                         dum->driver->disconnect (&dum->gadget);
 306                         spin_lock (&dum->lock);
 307                 }
 308         } else if (dum->active != dum->old_active) {
 309                 if (dum->old_active && dum->driver->suspend) {
 310                         spin_unlock (&dum->lock);
 311                         dum->driver->suspend (&dum->gadget);
 312                         spin_lock (&dum->lock);
 313                 } else if (!dum->old_active && dum->driver->resume) {
 314                         spin_unlock (&dum->lock);
 315                         dum->driver->resume (&dum->gadget);
 316                         spin_lock (&dum->lock);
 317                 }
 318         }
 319
 320         dum->old_status = dum->port_status;
 321         dum->old_active = dum->active;
 322 }
 323
 324 /*-------------------------------------------------------------------------*/
 325
 326 /* SLAVE/GADGET SIDE DRIVER
 327  *
 328  * This only tracks gadget state.  All the work is done when the host
 329  * side tries some (emulated) i/o operation.  Real device controller
 330  * drivers would do real i/o using dma, fifos, irqs, timers, etc.
 331  */
 332
 333 #define is_enabled(dum) \
 334         (dum->port_status & USB_PORT_STAT_ENABLE)
 335
 336 static int
 337 dummy_enable (struct usb_ep *_ep, const struct usb_endpoint_descriptor *desc)
 338 {
 339         struct dummy            *dum;
 340         struct dummy_ep         *ep;
 341         unsigned                max;
 342         int                     retval;
 343
 344         ep = usb_ep_to_dummy_ep (_ep);
 345         if (!_ep || !desc || ep->desc || _ep->name == ep0name
 346                         || desc->bDescriptorType != USB_DT_ENDPOINT)
 347                 return -EINVAL;
 348         dum = ep_to_dummy (ep);
 349         if (!dum->driver || !is_enabled (dum))
 350                 return -ESHUTDOWN;
 351         max = le16_to_cpu(desc->wMaxPacketSize) & 0x3ff;
 352
 353         /* drivers must not request bad settings, since lower levels
 354          * (hardware or its drivers) may not check.  some endpoints
 355          * can't do iso, many have maxpacket limitations, etc.
 356          *
 357          * since this "hardware" driver is here to help debugging, we
 358          * have some extra sanity checks.  (there could be more though,
 359          * especially for "ep9out" style fixed function ones.)
 360          */
 361         retval = -EINVAL;
 362         switch (desc->bmAttributes & 0x03) {
 363         case USB_ENDPOINT_XFER_BULK:
 364                 if (strstr (ep->ep.name, "-iso")
 365                                 || strstr (ep->ep.name, "-int")) {
 366                         goto done;
 367                 }
 368                 switch (dum->gadget.speed) {
 369                 case USB_SPEED_HIGH:
 370                         if (max == 512)
 371                                 break;
 372                         /* conserve return statements */
 373                 default:
 374                         switch (max) {
 375                         case 8: case 16: case 32: case 64:
 376                                 /* we'll fake any legal size */
 377                                 break;
 378                         default:
 379                 case USB_SPEED_LOW:
 380                                 goto done;
 381                         }
 382                 }
 383                 break;
 384         case USB_ENDPOINT_XFER_INT:
 385                 if (strstr (ep->ep.name, "-iso")) /* bulk is ok */
 386                         goto done;
 387                 /* real hardware might not handle all packet sizes */
 388                 switch (dum->gadget.speed) {
 389                 case USB_SPEED_HIGH:
 390                         if (max <= 1024)
 391                                 break;
 392                         /* save a return statement */
 393                 case USB_SPEED_FULL:
 394                         if (max <= 64)
 395                                 break;
 396                         /* save a return statement */
 397                 default:
 398                         if (max <= 8)
 399                                 break;
 400                         goto done;
 401                 }
 402                 break;
 403         case USB_ENDPOINT_XFER_ISOC:
 404                 if (strstr (ep->ep.name, "-bulk")
 405                                 || strstr (ep->ep.name, "-int"))
 406                         goto done;
 407                 /* real hardware might not handle all packet sizes */
 408                 switch (dum->gadget.speed) {
 409                 case USB_SPEED_HIGH:
 410                         if (max <= 1024)
 411                                 break;
 412                         /* save a return statement */
 413                 case USB_SPEED_FULL:
 414                         if (max <= 1023)
 415                                 break;
 416                         /* save a return statement */
 417                 default:
 418                         goto done;
 419                 }
 420                 break;
 421         default:
 422                 /* few chips support control except on ep0 */
 423                 goto done;
 424         }
 425
 426         _ep->maxpacket = max;
 427         ep->desc = desc;
 428
 429         dev_dbg (udc_dev(dum), "enabled %s (ep%d%s-%s) maxpacket %d\n",
 430                 _ep->name,
 431                 desc->bEndpointAddress & 0x0f,
 432                 (desc->bEndpointAddress & USB_DIR_IN) ? "in" : "out",
 433                 ({ char *val;
 434                  switch (desc->bmAttributes & 0x03) {
 435                  case USB_ENDPOINT_XFER_BULK: val = "bulk"; break;
 436                  case USB_ENDPOINT_XFER_ISOC: val = "iso"; break;
 437                  case USB_ENDPOINT_XFER_INT: val = "intr"; break;
 438                  default: val = "ctrl"; break;
 439                  }; val; }),
 440                 max);
 441
 442         /* at this point real hardware should be NAKing transfers
 443          * to that endpoint, until a buffer is queued to it.
 444          */
 445         retval = 0;
 446 done:
 447         return retval;
 448 }
 449
 450 static int dummy_disable (struct usb_ep *_ep)
 451 {
 452         struct dummy_ep         *ep;
 453         struct dummy            *dum;
 454         unsigned long           flags;
 455         int                     retval;
 456
 457         ep = usb_ep_to_dummy_ep (_ep);
 458         if (!_ep || !ep->desc || _ep->name == ep0name)
 459                 return -EINVAL;
 460         dum = ep_to_dummy (ep);
 461
 462         spin_lock_irqsave (&dum->lock, flags);
 463         ep->desc = NULL;
 464         retval = 0;
 465         nuke (dum, ep);
 466         spin_unlock_irqrestore (&dum->lock, flags);
 467
 468         dev_dbg (udc_dev(dum), "disabled %s\n", _ep->name);
 469         return retval;
 470 }
 471
 472 static struct usb_request *
 473 dummy_alloc_request (struct usb_ep *_ep, unsigned mem_flags)
 474 {
 475         struct dummy_ep         *ep;
 476         struct dummy_request    *req;
 477
 478         if (!_ep)
 479                 return NULL;
 480         ep = usb_ep_to_dummy_ep (_ep);
 481
 482         req = kmalloc (sizeof *req, mem_flags);
 483         if (!req)
 484                 return NULL;
 485         memset (req, 0, sizeof *req);
 486         INIT_LIST_HEAD (&req->queue);
 487         return &req->req;
 488 }
 489
 490 static void
 491 dummy_free_request (struct usb_ep *_ep, struct usb_request *_req)
 492 {
 493         struct dummy_ep         *ep;
 494         struct dummy_request    *req;
 495
 496         ep = usb_ep_to_dummy_ep (_ep);
 497         if (!ep || !_req || (!ep->desc && _ep->name != ep0name))
 498                 return;
 499
 500         req = usb_request_to_dummy_request (_req);
 501         WARN_ON (!list_empty (&req->queue));
 502         kfree (req);
 503 }
 504
 505 static void *
 506 dummy_alloc_buffer (
 507         struct usb_ep *_ep,
 508         unsigned bytes,
 509         dma_addr_t *dma,
 510         unsigned mem_flags
 511 ) {
 512         char                    *retval;
 513         struct dummy_ep         *ep;
 514         struct dummy            *dum;
 515
 516         ep = usb_ep_to_dummy_ep (_ep);
 517         dum = ep_to_dummy (ep);
 518
 519         if (!dum->driver)
 520                 return NULL;
 521         retval = kmalloc (bytes, mem_flags);
 522         *dma = (dma_addr_t) retval;
 523         return retval;
 524 }
 525
 526 static void
 527 dummy_free_buffer (
 528         struct usb_ep *_ep,
 529         void *buf,
 530         dma_addr_t dma,
 531         unsigned bytes
 532 ) {
 533         if (bytes)
 534                 kfree (buf);
 535 }
 536
 537 static void
 538 fifo_complete (struct usb_ep *ep, struct usb_request *req)
 539 {
 540 }
 541
 542 static int
 543 dummy_queue (struct usb_ep *_ep, struct usb_request *_req,
 544                 unsigned mem_flags)
 545 {
 546         struct dummy_ep         *ep;
 547         struct dummy_request    *req;
 548         struct dummy            *dum;
 549         unsigned long           flags;
 550
 551         req = usb_request_to_dummy_request (_req);
 552         if (!_req || !list_empty (&req->queue) || !_req->complete)
 553                 return -EINVAL;
 554
 555         ep = usb_ep_to_dummy_ep (_ep);
 556         if (!_ep || (!ep->desc && _ep->name != ep0name))
 557                 return -EINVAL;
 558
 559         dum = ep_to_dummy (ep);
 560         if (!dum->driver || !is_enabled (dum))
 561                 return -ESHUTDOWN;
 562
 563 #if 0
 564         dev_dbg (udc_dev(dum), "ep %p queue req %p to %s, len %d buf %p\n",
 565                         ep, _req, _ep->name, _req->length, _req->buf);
 566 #endif
 567
 568         _req->status = -EINPROGRESS;
 569         _req->actual = 0;
 570         spin_lock_irqsave (&dum->lock, flags);
 571
 572         /* implement an emulated single-request FIFO */
 573         if (ep->desc && (ep->desc->bEndpointAddress & USB_DIR_IN) &&
 574                         list_empty (&dum->fifo_req.queue) &&
 575                         list_empty (&ep->queue) &&
 576                         _req->length <= FIFO_SIZE) {
 577                 req = &dum->fifo_req;
 578                 req->req = *_req;
 579                 req->req.buf = dum->fifo_buf;
 580                 memcpy (dum->fifo_buf, _req->buf, _req->length);
 581                 req->req.context = dum;
 582                 req->req.complete = fifo_complete;
 583
 584                 spin_unlock (&dum->lock);
 585                 _req->actual = _req->length;
 586                 _req->status = 0;
 587                 _req->complete (_ep, _req);
 588                 spin_lock (&dum->lock);
 589         }
 590         list_add_tail (&req->queue, &ep->queue);
 591         spin_unlock_irqrestore (&dum->lock, flags);
 592
 593         /* real hardware would likely enable transfers here, in case
 594          * it'd been left NAKing.
 595          */
 596         return 0;
 597 }
 598
 599 static int dummy_dequeue (struct usb_ep *_ep, struct usb_request *_req)
 600 {
 601         struct dummy_ep         *ep;
 602         struct dummy            *dum;
 603         int                     retval = -EINVAL;
 604         unsigned long           flags;
 605         struct dummy_request    *req = NULL;
 606
 607         if (!_ep || !_req)
 608                 return retval;
 609         ep = usb_ep_to_dummy_ep (_ep);
 610         dum = ep_to_dummy (ep);
 611
 612         if (!dum->driver)
 613                 return -ESHUTDOWN;
 614
 615         spin_lock_irqsave (&dum->lock, flags);
 616         list_for_each_entry (req, &ep->queue, queue) {
 617                 if (&req->req == _req) {
 618                         list_del_init (&req->queue);
 619                         _req->status = -ECONNRESET;
 620                         retval = 0;
 621                         break;
 622                 }
 623         }
 624         spin_unlock_irqrestore (&dum->lock, flags);
 625
 626         if (retval == 0) {
 627                 dev_dbg (udc_dev(dum),
 628                                 "dequeued req %p from %s, len %d buf %p\n",
 629                                 req, _ep->name, _req->length, _req->buf);
 630                 _req->complete (_ep, _req);
 631         }
 632         return retval;
 633 }
 634
 635 static int
 636 dummy_set_halt (struct usb_ep *_ep, int value)
 637 {
 638         struct dummy_ep         *ep;
 639         struct dummy            *dum;
 640
 641         if (!_ep)
 642                 return -EINVAL;
 643         ep = usb_ep_to_dummy_ep (_ep);
 644         dum = ep_to_dummy (ep);
 645         if (!dum->driver)
 646                 return -ESHUTDOWN;
 647         if (!value)
 648                 ep->halted = 0;
 649         else if (ep->desc && (ep->desc->bEndpointAddress & USB_DIR_IN) &&
 650                         !list_empty (&ep->queue))
 651                 return -EAGAIN;
 652         else
 653                 ep->halted = 1;
 654         /* FIXME clear emulated data toggle too */
 655         return 0;
 656 }
 657
 658 static const struct usb_ep_ops dummy_ep_ops = {
 659         .enable         = dummy_enable,
 660         .disable        = dummy_disable,
 661
 662         .alloc_request  = dummy_alloc_request,
 663         .free_request   = dummy_free_request,
 664
 665         .alloc_buffer   = dummy_alloc_buffer,
 666         .free_buffer    = dummy_free_buffer,
 667         /* map, unmap, ... eventually hook the "generic" dma calls */
 668
 669         .queue          = dummy_queue,
 670         .dequeue        = dummy_dequeue,
 671
 672         .set_halt       = dummy_set_halt,
 673 };
 674
 675 /*-------------------------------------------------------------------------*/
 676
 677 /* there are both host and device side versions of this call ... */
 678 static int dummy_g_get_frame (struct usb_gadget *_gadget)
 679 {
 680         struct timeval  tv;
 681
 682         do_gettimeofday (&tv);
 683         return tv.tv_usec / 1000;
 684 }
 685
 686 static int dummy_wakeup (struct usb_gadget *_gadget)
 687 {
 688         struct dummy    *dum;
 689
 690         dum = gadget_to_dummy (_gadget);
 691         if (!(dum->devstatus &  ( (1 << USB_DEVICE_B_HNP_ENABLE)
 692                                 | (1 << USB_DEVICE_REMOTE_WAKEUP))))
 693                 return -EINVAL;
 694         if ((dum->port_status & USB_PORT_STAT_CONNECTION) == 0)
 695                 return -ENOLINK;
 696         if ((dum->port_status & USB_PORT_STAT_SUSPEND) == 0 &&
 697                          dum->rh_state != DUMMY_RH_SUSPENDED)
 698                 return -EIO;
 699
 700         /* FIXME: What if the root hub is suspended but the port isn't? */
 701
 702         /* hub notices our request, issues downstream resume, etc */
 703         dum->resuming = 1;
 704         dum->re_timeout = jiffies + msecs_to_jiffies(20);
 705         mod_timer (&dummy_to_hcd (dum)->rh_timer, dum->re_timeout);
 706         return 0;
 707 }
 708
 709 static int dummy_set_selfpowered (struct usb_gadget *_gadget, int value)
 710 {
 711         struct dummy    *dum;
 712
 713         dum = gadget_to_dummy (_gadget);
 714         if (value)
 715                 dum->devstatus |= (1 << USB_DEVICE_SELF_POWERED);
 716         else
 717                 dum->devstatus &= ~(1 << USB_DEVICE_SELF_POWERED);
 718         return 0;
 719 }
 720
 721 static int dummy_pullup (struct usb_gadget *_gadget, int value)
 722 {
 723         struct dummy    *dum;
 724         unsigned long   flags;
 725
 726         dum = gadget_to_dummy (_gadget);
 727         spin_lock_irqsave (&dum->lock, flags);
 728         dum->pullup = (value != 0);
 729         set_link_state (dum);
 730         spin_unlock_irqrestore (&dum->lock, flags);
 731
 732         usb_hcd_poll_rh_status (dummy_to_hcd (dum));
 733         return 0;
 734 }
 735
 736 static const struct usb_gadget_ops dummy_ops = {
 737         .get_frame      = dummy_g_get_frame,
 738         .wakeup         = dummy_wakeup,
 739         .set_selfpowered = dummy_set_selfpowered,
 740         .pullup         = dummy_pullup,
 741 };
 742
 743 /*-------------------------------------------------------------------------*/
 744
 745 /* "function" sysfs attribute */
 746 static ssize_t
 747 show_function (struct device *dev, struct device_attribute *attr, char *buf)
 748 {
 749         struct dummy    *dum = gadget_dev_to_dummy (dev);
 750
 751         if (!dum->driver || !dum->driver->function)
 752                 return 0;
 753         return scnprintf (buf, PAGE_SIZE, "%s\n", dum->driver->function);
 754 }
 755 static DEVICE_ATTR (function, S_IRUGO, show_function, NULL);
 756
 757 /*-------------------------------------------------------------------------*/
 758
 759 /*
 760  * Driver registration/unregistration.
 761  *
 762  * This is basically hardware-specific; there's usually only one real USB
 763  * device (not host) controller since that's how USB devices are intended
 764  * to work.  So most implementations of these api calls will rely on the
 765  * fact that only one driver will ever bind to the hardware.  But curious
 766  * hardware can be built with discrete components, so the gadget API doesn't
 767  * require that assumption.
 768  *
 769  * For this emulator, it might be convenient to create a usb slave device
 770  * for each driver that registers:  just add to a big root hub.
 771  */
 772
 773 int
 774 usb_gadget_register_driver (struct usb_gadget_driver *driver)
 775 {
 776         struct dummy    *dum = the_controller;
 777         int             retval, i;
 778
 779         if (!dum)
 780                 return -EINVAL;
 781         if (dum->driver)
 782                 return -EBUSY;
 783         if (!driver->bind || !driver->unbind || !driver->setup
 784                         || driver->speed == USB_SPEED_UNKNOWN)
 785                 return -EINVAL;
 786
 787         /*
 788          * SLAVE side init ... the layer above hardware, which
 789          * can't enumerate without help from the driver we're binding.
 790          */
 791
 792         dum->devstatus = 0;
 793
 794         INIT_LIST_HEAD (&dum->gadget.ep_list);
 795         for (i = 0; i < DUMMY_ENDPOINTS; i++) {
 796                 struct dummy_ep *ep = &dum->ep [i];
 797
 798                 if (!ep_name [i])
 799                         break;
 800                 ep->ep.name = ep_name [i];
 801                 ep->ep.ops = &dummy_ep_ops;
 802                 list_add_tail (&ep->ep.ep_list, &dum->gadget.ep_list);
 803                 ep->halted = ep->already_seen = ep->setup_stage = 0;
 804                 ep->ep.maxpacket = ~0;
 805                 ep->last_io = jiffies;
 806                 ep->gadget = &dum->gadget;
 807                 ep->desc = NULL;
 808                 INIT_LIST_HEAD (&ep->queue);
 809         }
 810
 811         dum->gadget.ep0 = &dum->ep [0].ep;
 812         dum->ep [0].ep.maxpacket = 64;
 813         list_del_init (&dum->ep [0].ep.ep_list);
 814         INIT_LIST_HEAD(&dum->fifo_req.queue);
 815
 816         dum->driver = driver;
 817         dum->gadget.dev.driver = &driver->driver;
 818         dev_dbg (udc_dev(dum), "binding gadget driver '%s'\n",
 819                         driver->driver.name);
 820         if ((retval = driver->bind (&dum->gadget)) != 0) {
 821                 dum->driver = NULL;
 822                 dum->gadget.dev.driver = NULL;
 823                 return retval;
 824         }
 825
 826         driver->driver.bus = dum->gadget.dev.parent->bus;
 827         driver_register (&driver->driver);
 828         device_bind_driver (&dum->gadget.dev);
 829
 830         /* khubd will enumerate this in a while */
 831         spin_lock_irq (&dum->lock);
 832         dum->pullup = 1;
 833         set_link_state (dum);
 834         spin_unlock_irq (&dum->lock);
 835
 836         usb_hcd_poll_rh_status (dummy_to_hcd (dum));
 837         return 0;
 838 }
 839 EXPORT_SYMBOL (usb_gadget_register_driver);
 840
 841 int
 842 usb_gadget_unregister_driver (struct usb_gadget_driver *driver)
 843 {
 844         struct dummy    *dum = the_controller;
 845         unsigned long   flags;
 846
 847         if (!dum)
 848                 return -ENODEV;
 849         if (!driver || driver != dum->driver)
 850                 return -EINVAL;
 851
 852         dev_dbg (udc_dev(dum), "unregister gadget driver '%s'\n",
 853                         driver->driver.name);
 854
 855         spin_lock_irqsave (&dum->lock, flags);
 856         dum->pullup = 0;
 857         set_link_state (dum);
 858         spin_unlock_irqrestore (&dum->lock, flags);
 859
 860         driver->unbind (&dum->gadget);
 861         dum->driver = NULL;
 862
 863         device_release_driver (&dum->gadget.dev);
 864         driver_unregister (&driver->driver);
 865
 866         spin_lock_irqsave (&dum->lock, flags);
 867         dum->pullup = 0;
 868         set_link_state (dum);
 869         spin_unlock_irqrestore (&dum->lock, flags);
 870
 871         usb_hcd_poll_rh_status (dummy_to_hcd (dum));
 872         return 0;
 873 }
 874 EXPORT_SYMBOL (usb_gadget_unregister_driver);
 875
 876 #undef is_enabled
 877
 878 /* just declare this in any driver that really need it */
 879 extern int net2280_set_fifo_mode (struct usb_gadget *gadget, int mode);
 880
 881 int net2280_set_fifo_mode (struct usb_gadget *gadget, int mode)
 882 {
 883         return -ENOSYS;
 884 }
 885 EXPORT_SYMBOL (net2280_set_fifo_mode);
 886
 887
 888 /* The gadget structure is stored inside the hcd structure and will be
 889  * released along with it. */
 890 static void
 891 dummy_gadget_release (struct device *dev)
 892 {
 893 #if 0           /* usb_bus_put isn't EXPORTed! */
 894         struct dummy    *dum = gadget_dev_to_dummy (dev);
 895
 896         usb_bus_put (&dummy_to_hcd (dum)->self);
 897 #endif
 898 }
 899
 900 static int dummy_udc_probe (struct device *dev)
 901 {
 902         struct dummy    *dum = the_controller;
 903         int             rc;
 904
 905         dum->gadget.name = gadget_name;
 906         dum->gadget.ops = &dummy_ops;
 907         dum->gadget.is_dualspeed = 1;
 908
 909         /* maybe claim OTG support, though we won't complete HNP */
 910         dum->gadget.is_otg = (dummy_to_hcd(dum)->self.otg_port != 0);
 911
 912         strcpy (dum->gadget.dev.bus_id, "gadget");
 913         dum->gadget.dev.parent = dev;
 914         dum->gadget.dev.release = dummy_gadget_release;
 915         rc = device_register (&dum->gadget.dev);
 916         if (rc < 0)
 917                 return rc;
 918
 919 #if 0           /* usb_bus_get isn't EXPORTed! */
 920         usb_bus_get (&dummy_to_hcd (dum)->self);
 921 #endif
 922
 923         dev_set_drvdata (dev, dum);
 924         device_create_file (&dum->gadget.dev, &dev_attr_function);
 925         return rc;
 926 }
 927
 928 static int dummy_udc_remove (struct device *dev)
 929 {
 930         struct dummy    *dum = dev_get_drvdata (dev);
 931
 932         dev_set_drvdata (dev, NULL);
 933         device_remove_file (&dum->gadget.dev, &dev_attr_function);
 934         device_unregister (&dum->gadget.dev);
 935         return 0;
 936 }
 937
 938 static int dummy_udc_suspend (struct device *dev, pm_message_t state,
 939                 u32 level)
 940 {
 941         struct dummy    *dum = dev_get_drvdata(dev);
 942
 943         if (level != SUSPEND_DISABLE)
 944                 return 0;
 945
 946         dev_dbg (dev, "%s\n", __FUNCTION__);
 947         spin_lock_irq (&dum->lock);
 948         dum->udc_suspended = 1;
 949         set_link_state (dum);
 950         spin_unlock_irq (&dum->lock);
 951
 952         dev->power.power_state = state;
 953         usb_hcd_poll_rh_status (dummy_to_hcd (dum));
 954         return 0;
 955 }
 956
 957 static int dummy_udc_resume (struct device *dev, u32 level)
 958 {
 959         struct dummy    *dum = dev_get_drvdata(dev);
 960
 961         if (level != RESUME_ENABLE)
 962                 return 0;
 963
 964         dev_dbg (dev, "%s\n", __FUNCTION__);
 965         spin_lock_irq (&dum->lock);
 966         dum->udc_suspended = 0;
 967         set_link_state (dum);
 968         spin_unlock_irq (&dum->lock);
 969
 970         dev->power.power_state = PMSG_ON;
 971         usb_hcd_poll_rh_status (dummy_to_hcd (dum));
 972         return 0;
 973 }
 974
 975 static struct device_driver dummy_udc_driver = {
 976         .name           = (char *) gadget_name,
 977         .bus            = &platform_bus_type,
 978         .probe          = dummy_udc_probe,
 979         .remove         = dummy_udc_remove,
 980         .suspend        = dummy_udc_suspend,
 981         .resume         = dummy_udc_resume,
 982 };
 983
 984 /*-------------------------------------------------------------------------*/
 985
 986 /* MASTER/HOST SIDE DRIVER
 987  *
 988  * this uses the hcd framework to hook up to host side drivers.
 989  * its root hub will only have one device, otherwise it acts like
 990  * a normal host controller.
 991  *
 992  * when urbs are queued, they're just stuck on a list that we
 993  * scan in a timer callback.  that callback connects writes from
 994  * the host with reads from the device, and so on, based on the
 995  * usb 2.0 rules.
 996  */
 997
 998 static int dummy_urb_enqueue (
 999         struct usb_hcd                  *hcd,
1000         struct usb_host_endpoint        *ep,
1001         struct urb                      *urb,
1002         unsigned                        mem_flags
1003 ) {
1004         struct dummy    *dum;
1005         struct urbp     *urbp;
1006         unsigned long   flags;
1007
1008         if (!urb->transfer_buffer && urb->transfer_buffer_length)
1009                 return -EINVAL;
1010
1011         urbp = kmalloc (sizeof *urbp, mem_flags);
1012         if (!urbp)
1013                 return -ENOMEM;
1014         urbp->urb = urb;
1015
1016         dum = hcd_to_dummy (hcd);
1017         spin_lock_irqsave (&dum->lock, flags);
1018
1019         if (!dum->udev) {
1020                 dum->udev = urb->dev;
1021                 usb_get_dev (dum->udev);
1022         } else if (unlikely (dum->udev != urb->dev))
1023                 dev_err (dummy_dev(dum), "usb_device address has changed!\n");
1024
1025         list_add_tail (&urbp->urbp_list, &dum->urbp_list);
1026         urb->hcpriv = urbp;
1027         if (usb_pipetype (urb->pipe) == PIPE_CONTROL)
1028                 urb->error_count = 1;           /* mark as a new urb */
1029
1030         /* kick the scheduler, it'll do the rest */
1031         if (!timer_pending (&dum->timer))
1032                 mod_timer (&dum->timer, jiffies + 1);
1033
1034         spin_unlock_irqrestore (&dum->lock, flags);
1035         return 0;
1036 }
1037
1038 static int dummy_urb_dequeue (struct usb_hcd *hcd, struct urb *urb)
1039 {
1040         struct dummy    *dum;
1041         unsigned long   flags;
1042
1043         /* giveback happens automatically in timer callback,
1044          * so make sure the callback happens */
1045         dum = hcd_to_dummy (hcd);
1046         spin_lock_irqsave (&dum->lock, flags);
1047         if (dum->rh_state != DUMMY_RH_RUNNING && !list_empty(&dum->urbp_list))
1048                 mod_timer (&dum->timer, jiffies);
1049         spin_unlock_irqrestore (&dum->lock, flags);
1050         return 0;
1051 }
1052
1053 static void maybe_set_status (struct urb *urb, int status)
1054 {
1055         spin_lock (&urb->lock);
1056         if (urb->status == -EINPROGRESS)
1057                 urb->status = status;
1058         spin_unlock (&urb->lock);
1059 }
1060
1061 /* transfer up to a frame's worth; caller must own lock */
1062 static int
1063 transfer (struct dummy *dum, struct urb *urb, struct dummy_ep *ep, int limit)
1064 {
1065         struct dummy_request    *req;
1066
1067 top:
1068         /* if there's no request queued, the device is NAKing; return */
1069         list_for_each_entry (req, &ep->queue, queue) {
1070                 unsigned        host_len, dev_len, len;
1071                 int             is_short, to_host;
1072                 int             rescan = 0;
1073
1074                 /* 1..N packets of ep->ep.maxpacket each ... the last one
1075                  * may be short (including zero length).
1076                  *
1077                  * writer can send a zlp explicitly (length 0) or implicitly
1078                  * (length mod maxpacket zero, and 'zero' flag); they always
1079                  * terminate reads.
1080                  */
1081                 host_len = urb->transfer_buffer_length - urb->actual_length;
1082                 dev_len = req->req.length - req->req.actual;
1083                 len = min (host_len, dev_len);
1084
1085                 /* FIXME update emulated data toggle too */
1086
1087                 to_host = usb_pipein (urb->pipe);
1088                 if (unlikely (len == 0))
1089                         is_short = 1;
1090                 else {
1091                         char            *ubuf, *rbuf;
1092
1093                         /* not enough bandwidth left? */
1094                         if (limit < ep->ep.maxpacket && limit < len)
1095                                 break;
1096                         len = min (len, (unsigned) limit);
1097                         if (len == 0)
1098                                 break;
1099
1100                         /* use an extra pass for the final short packet */
1101                         if (len > ep->ep.maxpacket) {
1102                                 rescan = 1;
1103                                 len -= (len % ep->ep.maxpacket);
1104                         }
1105                         is_short = (len % ep->ep.maxpacket) != 0;
1106
1107                         /* else transfer packet(s) */
1108                         ubuf = urb->transfer_buffer + urb->actual_length;
1109                         rbuf = req->req.buf + req->req.actual;
1110                         if (to_host)
1111                                 memcpy (ubuf, rbuf, len);
1112                         else
1113                                 memcpy (rbuf, ubuf, len);
1114                         ep->last_io = jiffies;
1115
1116                         limit -= len;
1117                         urb->actual_length += len;
1118                         req->req.actual += len;
1119                 }
1120
1121                 /* short packets terminate, maybe with overflow/underflow.
1122                  * it's only really an error to write too much.
1123                  *
1124                  * partially filling a buffer optionally blocks queue advances
1125                  * (so completion handlers can clean up the queue) but we don't
1126                  * need to emulate such data-in-flight.  so we only show part
1127                  * of the URB_SHORT_NOT_OK effect: completion status.
1128                  */
1129                 if (is_short) {
1130                         if (host_len == dev_len) {
1131                                 req->req.status = 0;
1132                                 maybe_set_status (urb, 0);
1133                         } else if (to_host) {
1134                                 req->req.status = 0;
1135                                 if (dev_len > host_len)
1136                                         maybe_set_status (urb, -EOVERFLOW);
1137                                 else
1138                                         maybe_set_status (urb,
1139                                                 (urb->transfer_flags
1140                                                         & URB_SHORT_NOT_OK)
1141                                                 ? -EREMOTEIO : 0);
1142                         } else if (!to_host) {
1143                                 maybe_set_status (urb, 0);
1144                                 if (host_len > dev_len)
1145                                         req->req.status = -EOVERFLOW;
1146                                 else
1147                                         req->req.status = 0;
1148                         }
1149
1150                 /* many requests terminate without a short packet */
1151                 } else {
1152                         if (req->req.length == req->req.actual
1153                                         && !req->req.zero)
1154                                 req->req.status = 0;
1155                         if (urb->transfer_buffer_length == urb->actual_length
1156                                         && !(urb->transfer_flags
1157                                                 & URB_ZERO_PACKET)) {
1158                                 maybe_set_status (urb, 0);
1159                         }
1160                 }
1161
1162                 /* device side completion --> continuable */
1163                 if (req->req.status != -EINPROGRESS) {
1164                         list_del_init (&req->queue);
1165
1166                         spin_unlock (&dum->lock);
1167                         req->req.complete (&ep->ep, &req->req);
1168                         spin_lock (&dum->lock);
1169
1170                         /* requests might have been unlinked... */
1171                         rescan = 1;
1172                 }
1173
1174                 /* host side completion --> terminate */
1175                 if (urb->status != -EINPROGRESS)
1176                         break;
1177
1178                 /* rescan to continue with any other queued i/o */
1179                 if (rescan)
1180                         goto top;
1181         }
1182         return limit;
1183 }
1184
1185 static int periodic_bytes (struct dummy *dum, struct dummy_ep *ep)
1186 {
1187         int     limit = ep->ep.maxpacket;
1188
1189         if (dum->gadget.speed == USB_SPEED_HIGH) {
1190                 int     tmp;
1191
1192                 /* high bandwidth mode */
1193                 tmp = le16_to_cpu(ep->desc->wMaxPacketSize);
1194                 tmp = (tmp >> 11) & 0x03;
1195                 tmp *= 8 /* applies to entire frame */;
1196                 limit += limit * tmp;
1197         }
1198         return limit;
1199 }
1200
1201 #define is_active(dum)  ((dum->port_status & \
1202                 (USB_PORT_STAT_CONNECTION | USB_PORT_STAT_ENABLE | \
1203                         USB_PORT_STAT_SUSPEND)) \
1204                 == (USB_PORT_STAT_CONNECTION | USB_PORT_STAT_ENABLE))
1205
1206 static struct dummy_ep *find_endpoint (struct dummy *dum, u8 address)
1207 {
1208         int             i;
1209
1210         if (!is_active (dum))
1211                 return NULL;
1212         if ((address & ~USB_DIR_IN) == 0)
1213                 return &dum->ep [0];
1214         for (i = 1; i < DUMMY_ENDPOINTS; i++) {
1215                 struct dummy_ep *ep = &dum->ep [i];
1216
1217                 if (!ep->desc)
1218                         continue;
1219                 if (ep->desc->bEndpointAddress == address)
1220                         return ep;
1221         }
1222         return NULL;
1223 }
1224
1225 #undef is_active
1226
1227 #define Dev_Request     (USB_TYPE_STANDARD | USB_RECIP_DEVICE)
1228 #define Dev_InRequest   (Dev_Request | USB_DIR_IN)
1229 #define Intf_Request    (USB_TYPE_STANDARD | USB_RECIP_INTERFACE)
1230 #define Intf_InRequest  (Intf_Request | USB_DIR_IN)
1231 #define Ep_Request      (USB_TYPE_STANDARD | USB_RECIP_ENDPOINT)
1232 #define Ep_InRequest    (Ep_Request | USB_DIR_IN)
1233
1234 /* drive both sides of the transfers; looks like irq handlers to
1235  * both drivers except the callbacks aren't in_irq().
1236  */
1237 static void dummy_timer (unsigned long _dum)
1238 {
1239         struct dummy            *dum = (struct dummy *) _dum;
1240         struct urbp             *urbp, *tmp;
1241         unsigned long           flags;
1242         int                     limit, total;
1243         int                     i;
1244
1245         /* simplistic model for one frame's bandwidth */
1246         switch (dum->gadget.speed) {
1247         case USB_SPEED_LOW:
1248                 total = 8/*bytes*/ * 12/*packets*/;
1249                 break;
1250         case USB_SPEED_FULL:
1251                 total = 64/*bytes*/ * 19/*packets*/;
1252                 break;
1253         case USB_SPEED_HIGH:
1254                 total = 512/*bytes*/ * 13/*packets*/ * 8/*uframes*/;
1255                 break;
1256         default:
1257                 dev_err (dummy_dev(dum), "bogus device speed\n");
1258                 return;
1259         }
1260
1261         /* FIXME if HZ != 1000 this will probably misbehave ... */
1262
1263         /* look at each urb queued by the host side driver */
1264         spin_lock_irqsave (&dum->lock, flags);
1265
1266         if (!dum->udev) {
1267                 dev_err (dummy_dev(dum),
1268                                 "timer fired with no URBs pending?\n");
1269                 spin_unlock_irqrestore (&dum->lock, flags);
1270                 return;
1271         }
1272
1273         for (i = 0; i < DUMMY_ENDPOINTS; i++) {
1274                 if (!ep_name [i])
1275                         break;
1276                 dum->ep [i].already_seen = 0;
1277         }
1278
1279 restart:
1280         list_for_each_entry_safe (urbp, tmp, &dum->urbp_list, urbp_list) {
1281                 struct urb              *urb;
1282                 struct dummy_request    *req;
1283                 u8                      address;
1284                 struct dummy_ep         *ep = NULL;
1285                 int                     type;
1286
1287                 urb = urbp->urb;
1288                 if (urb->status != -EINPROGRESS) {
1289                         /* likely it was just unlinked */
1290                         goto return_urb;
1291                 } else if (dum->rh_state != DUMMY_RH_RUNNING)
1292                         continue;
1293                 type = usb_pipetype (urb->pipe);
1294
1295                 /* used up this frame's non-periodic bandwidth?
1296                  * FIXME there's infinite bandwidth for control and
1297                  * periodic transfers ... unrealistic.
1298                  */
1299                 if (total <= 0 && type == PIPE_BULK)
1300                         continue;
1301
1302                 /* find the gadget's ep for this request (if configured) */
1303                 address = usb_pipeendpoint (urb->pipe);
1304                 if (usb_pipein (urb->pipe))
1305                         address |= USB_DIR_IN;
1306                 ep = find_endpoint(dum, address);
1307                 if (!ep) {
1308                         /* set_configuration() disagreement */
1309                         dev_dbg (dummy_dev(dum),
1310                                 "no ep configured for urb %p\n",
1311                                 urb);
1312                         maybe_set_status (urb, -EPROTO);
1313                         goto return_urb;
1314                 }
1315
1316                 if (ep->already_seen)
1317                         continue;
1318                 ep->already_seen = 1;
1319                 if (ep == &dum->ep [0] && urb->error_count) {
1320                         ep->setup_stage = 1;    /* a new urb */
1321                         urb->error_count = 0;
1322                 }
1323                 if (ep->halted && !ep->setup_stage) {
1324                         /* NOTE: must not be iso! */
1325                         dev_dbg (dummy_dev(dum), "ep %s halted, urb %p\n",
1326                                         ep->ep.name, urb);
1327                         maybe_set_status (urb, -EPIPE);
1328                         goto return_urb;
1329                 }
1330                 /* FIXME make sure both ends agree on maxpacket */
1331
1332                 /* handle control requests */
1333                 if (ep == &dum->ep [0] && ep->setup_stage) {
1334                         struct usb_ctrlrequest          setup;
1335                         int                             value = 1;
1336                         struct dummy_ep                 *ep2;
1337                         unsigned                        w_index;
1338                         unsigned                        w_value;
1339
1340                         setup = *(struct usb_ctrlrequest*) urb->setup_packet;
1341                         w_index = le16_to_cpu(setup.wIndex);
1342                         w_value = le16_to_cpu(setup.wValue);
1343                         if (le16_to_cpu(setup.wLength) !=
1344                                         urb->transfer_buffer_length) {
1345                                 maybe_set_status (urb, -EOVERFLOW);
1346                                 goto return_urb;
1347                         }
1348
1349                         /* paranoia, in case of stale queued data */
1350                         list_for_each_entry (req, &ep->queue, queue) {
1351                                 list_del_init (&req->queue);
1352                                 req->req.status = -EOVERFLOW;
1353                                 dev_dbg (udc_dev(dum), "stale req = %p\n",
1354                                                 req);
1355
1356                                 spin_unlock (&dum->lock);
1357                                 req->req.complete (&ep->ep, &req->req);
1358                                 spin_lock (&dum->lock);
1359                                 ep->already_seen = 0;
1360                                 goto restart;
1361                         }
1362
1363                         /* gadget driver never sees set_address or operations
1364                          * on standard feature flags.  some hardware doesn't
1365                          * even expose them.
1366                          */
1367                         ep->last_io = jiffies;
1368                         ep->setup_stage = 0;
1369                         ep->halted = 0;
1370                         switch (setup.bRequest) {
1371                         case USB_REQ_SET_ADDRESS:
1372                                 if (setup.bRequestType != Dev_Request)
1373                                         break;
1374                                 dum->address = w_value;
1375                                 maybe_set_status (urb, 0);
1376                                 dev_dbg (udc_dev(dum), "set_address = %d\n",
1377                                                 w_value);
1378                                 value = 0;
1379                                 break;
1380                         case USB_REQ_SET_FEATURE:
1381                                 if (setup.bRequestType == Dev_Request) {
1382                                         value = 0;
1383                                         switch (w_value) {
1384                                         case USB_DEVICE_REMOTE_WAKEUP:
1385                                                 break;
1386                                         case USB_DEVICE_B_HNP_ENABLE:
1387                                                 dum->gadget.b_hnp_enable = 1;
1388                                                 break;
1389                                         case USB_DEVICE_A_HNP_SUPPORT:
1390                                                 dum->gadget.a_hnp_support = 1;
1391                                                 break;
1392                                         case USB_DEVICE_A_ALT_HNP_SUPPORT:
1393                                                 dum->gadget.a_alt_hnp_support
1394                                                         = 1;
1395                                                 break;
1396                                         default:
1397                                                 value = -EOPNOTSUPP;
1398                                         }
1399                                         if (value == 0) {
1400                                                 dum->devstatus |=
1401                                                         (1 << w_value);
1402                                                 maybe_set_status (urb, 0);
1403                                         }
1404
1405                                 } else if (setup.bRequestType == Ep_Request) {
1406                                         // endpoint halt
1407                                         ep2 = find_endpoint (dum, w_index);
1408                                         if (!ep2) {
1409                                                 value = -EOPNOTSUPP;
1410                                                 break;
1411                                         }
1412                                         ep2->halted = 1;
1413                                         value = 0;
1414                                         maybe_set_status (urb, 0);
1415                                 }
1416                                 break;
1417                         case USB_REQ_CLEAR_FEATURE:
1418                                 if (setup.bRequestType == Dev_Request) {
1419                                         switch (w_value) {
1420                                         case USB_DEVICE_REMOTE_WAKEUP:
1421                                                 dum->devstatus &= ~(1 <<
1422                                                         USB_DEVICE_REMOTE_WAKEUP);
1423                                                 value = 0;
1424                                                 maybe_set_status (urb, 0);
1425                                                 break;
1426                                         default:
1427                                                 value = -EOPNOTSUPP;
1428                                                 break;
1429                                         }
1430                                 } else if (setup.bRequestType == Ep_Request) {
1431                                         // endpoint halt
1432                                         ep2 = find_endpoint (dum, w_index);
1433                                         if (!ep2) {
1434                                                 value = -EOPNOTSUPP;
1435                                                 break;
1436                                         }
1437                                         ep2->halted = 0;
1438                                         value = 0;
1439                                         maybe_set_status (urb, 0);
1440                                 }
1441                                 break;
1442                         case USB_REQ_GET_STATUS:
1443                                 if (setup.bRequestType == Dev_InRequest
1444                                                 || setup.bRequestType
1445                                                         == Intf_InRequest
1446                                                 || setup.bRequestType
1447                                                         == Ep_InRequest
1448                                                 ) {
1449                                         char *buf;
1450
1451                                         // device: remote wakeup, selfpowered
1452                                         // interface: nothing
1453                                         // endpoint: halt
1454                                         buf = (char *)urb->transfer_buffer;
1455                                         if (urb->transfer_buffer_length > 0) {
1456                                                 if (setup.bRequestType ==
1457                                                                 Ep_InRequest) {
1458         ep2 = find_endpoint (dum, w_index);
1459         if (!ep2) {
1460                 value = -EOPNOTSUPP;
1461                 break;
1462         }
1463         buf [0] = ep2->halted;
1464                                                 } else if (setup.bRequestType ==
1465                                                                 Dev_InRequest) {
1466                                                         buf [0] = (u8)
1467                                                                 dum->devstatus;
1468                                                 } else
1469                                                         buf [0] = 0;
1470                                         }
1471                                         if (urb->transfer_buffer_length > 1)
1472                                                 buf [1] = 0;
1473                                         urb->actual_length = min (2,
1474                                                 urb->transfer_buffer_length);
1475                                         value = 0;
1476                                         maybe_set_status (urb, 0);
1477                                 }
1478                                 break;
1479                         }
1480
1481                         /* gadget driver handles all other requests.  block
1482                          * until setup() returns; no reentrancy issues etc.
1483                          */
1484                         if (value > 0) {
1485                                 spin_unlock (&dum->lock);
1486                                 value = dum->driver->setup (&dum->gadget,
1487                                                 &setup);
1488                                 spin_lock (&dum->lock);
1489
1490                                 if (value >= 0) {
1491                                         /* no delays (max 64KB data stage) */
1492                                         limit = 64*1024;
1493                                         goto treat_control_like_bulk;
1494                                 }
1495                                 /* error, see below */
1496                         }
1497
1498                         if (value < 0) {
1499                                 if (value != -EOPNOTSUPP)
1500                                         dev_dbg (udc_dev(dum),
1501                                                 "setup --> %d\n",
1502                                                 value);
1503                                 maybe_set_status (urb, -EPIPE);
1504                                 urb->actual_length = 0;
1505                         }
1506
1507                         goto return_urb;
1508                 }
1509
1510                 /* non-control requests */
1511                 limit = total;
1512                 switch (usb_pipetype (urb->pipe)) {
1513                 case PIPE_ISOCHRONOUS:
1514                         /* FIXME is it urb->interval since the last xfer?
1515                          * use urb->iso_frame_desc[i].
1516                          * complete whether or not ep has requests queued.
1517                          * report random errors, to debug drivers.
1518                          */
1519                         limit = max (limit, periodic_bytes (dum, ep));
1520                         maybe_set_status (urb, -ENOSYS);
1521                         break;
1522
1523                 case PIPE_INTERRUPT:
1524                         /* FIXME is it urb->interval since the last xfer?
1525                          * this almost certainly polls too fast.
1526                          */
1527                         limit = max (limit, periodic_bytes (dum, ep));
1528                         /* FALLTHROUGH */
1529
1530                 // case PIPE_BULK:  case PIPE_CONTROL:
1531                 default:
1532                 treat_control_like_bulk:
1533                         ep->last_io = jiffies;
1534                         total = transfer (dum, urb, ep, limit);
1535                         break;
1536                 }
1537
1538                 /* incomplete transfer? */
1539                 if (urb->status == -EINPROGRESS)
1540                         continue;
1541
1542 return_urb:
1543                 urb->hcpriv = NULL;
1544                 list_del (&urbp->urbp_list);
1545                 kfree (urbp);
1546                 if (ep)
1547                         ep->already_seen = ep->setup_stage = 0;
1548
1549                 spin_unlock (&dum->lock);
1550                 usb_hcd_giveback_urb (dummy_to_hcd(dum), urb, NULL);
1551                 spin_lock (&dum->lock);
1552
1553                 goto restart;
1554         }
1555
1556         if (list_empty (&dum->urbp_list)) {
1557                 usb_put_dev (dum->udev);
1558                 dum->udev = NULL;
1559         } else if (dum->rh_state == DUMMY_RH_RUNNING) {
1560                 /* want a 1 msec delay here */
1561                 mod_timer (&dum->timer, jiffies + msecs_to_jiffies(1));
1562         }
1563
1564         spin_unlock_irqrestore (&dum->lock, flags);
1565 }
1566
1567 /*-------------------------------------------------------------------------*/
1568
1569 #define PORT_C_MASK \
1570         ((USB_PORT_STAT_C_CONNECTION \
1571         | USB_PORT_STAT_C_ENABLE \
1572         | USB_PORT_STAT_C_SUSPEND \
1573         | USB_PORT_STAT_C_OVERCURRENT \
1574         | USB_PORT_STAT_C_RESET) << 16)
1575
1576 static int dummy_hub_status (struct usb_hcd *hcd, char *buf)
1577 {
1578         struct dummy            *dum;
1579         unsigned long           flags;
1580         int                     retval = 0;
1581
1582         dum = hcd_to_dummy (hcd);
1583
1584         spin_lock_irqsave (&dum->lock, flags);
1585         if (hcd->state != HC_STATE_RUNNING)
1586                 goto done;
1587
1588         if (dum->resuming && time_after_eq (jiffies, dum->re_timeout)) {
1589                 dum->port_status |= (USB_PORT_STAT_C_SUSPEND << 16);
1590                 dum->port_status &= ~USB_PORT_STAT_SUSPEND;
1591                 set_link_state (dum);
1592         }
1593
1594         if ((dum->port_status & PORT_C_MASK) != 0) {
1595                 *buf = (1 << 1);
1596                 dev_dbg (dummy_dev(dum), "port status 0x%08x has changes\n",
1597                                 dum->port_status);
1598                 retval = 1;
1599                 if (dum->rh_state == DUMMY_RH_SUSPENDED)
1600                         usb_hcd_resume_root_hub (hcd);
1601         }
1602 done:
1603         spin_unlock_irqrestore (&dum->lock, flags);
1604         return retval;
1605 }
1606
1607 static inline void
1608 hub_descriptor (struct usb_hub_descriptor *desc)
1609 {
1610         memset (desc, 0, sizeof *desc);
1611         desc->bDescriptorType = 0x29;
1612         desc->bDescLength = 9;
1613         desc->wHubCharacteristics = (__force __u16)
1614                         (__constant_cpu_to_le16 (0x0001));
1615         desc->bNbrPorts = 1;
1616         desc->bitmap [0] = 0xff;
1617         desc->bitmap [1] = 0xff;
1618 }
1619
1620 static int dummy_hub_control (
1621         struct usb_hcd  *hcd,
1622         u16             typeReq,
1623         u16             wValue,
1624         u16             wIndex,
1625         char            *buf,
1626         u16             wLength
1627 ) {
1628         struct dummy    *dum;
1629         int             retval = 0;
1630         unsigned long   flags;
1631
1632         if (hcd->state != HC_STATE_RUNNING)
1633                 return -ETIMEDOUT;
1634
1635         dum = hcd_to_dummy (hcd);
1636         spin_lock_irqsave (&dum->lock, flags);
1637         switch (typeReq) {
1638         case ClearHubFeature:
1639                 break;
1640         case ClearPortFeature:
1641                 switch (wValue) {
1642                 case USB_PORT_FEAT_SUSPEND:
1643                         if (dum->port_status & USB_PORT_STAT_SUSPEND) {
1644                                 /* 20msec resume signaling */
1645                                 dum->resuming = 1;
1646                                 dum->re_timeout = jiffies +
1647                                                 msecs_to_jiffies(20);
1648                         }
1649                         break;
1650                 case USB_PORT_FEAT_POWER:
1651                         if (dum->port_status & USB_PORT_STAT_POWER)
1652                                 dev_dbg (dummy_dev(dum), "power-off\n");
1653                         /* FALLS THROUGH */
1654                 default:
1655                         dum->port_status &= ~(1 << wValue);
1656                         set_link_state (dum);
1657                 }
1658                 break;
1659         case GetHubDescriptor:
1660                 hub_descriptor ((struct usb_hub_descriptor *) buf);
1661                 break;
1662         case GetHubStatus:
1663                 *(__le32 *) buf = __constant_cpu_to_le32 (0);
1664                 break;
1665         case GetPortStatus:
1666                 if (wIndex != 1)
1667                         retval = -EPIPE;
1668
1669                 /* whoever resets or resumes must GetPortStatus to
1670                  * complete it!!
1671                  */
1672                 if (dum->resuming &&
1673                                 time_after_eq (jiffies, dum->re_timeout)) {
1674                         dum->port_status |= (USB_PORT_STAT_C_SUSPEND << 16);
1675                         dum->port_status &= ~USB_PORT_STAT_SUSPEND;
1676                 }
1677                 if ((dum->port_status & USB_PORT_STAT_RESET) != 0 &&
1678                                 time_after_eq (jiffies, dum->re_timeout)) {
1679                         dum->port_status |= (USB_PORT_STAT_C_RESET << 16);
1680                         dum->port_status &= ~USB_PORT_STAT_RESET;
1681                         if (dum->pullup) {
1682                                 dum->port_status |= USB_PORT_STAT_ENABLE;
1683                                 /* give it the best speed we agree on */
1684                                 dum->gadget.speed = dum->driver->speed;
1685                                 dum->gadget.ep0->maxpacket = 64;
1686                                 switch (dum->gadget.speed) {
1687                                 case USB_SPEED_HIGH:
1688                                         dum->port_status |=
1689                                                 USB_PORT_STAT_HIGH_SPEED;
1690                                         break;
1691                                 case USB_SPEED_LOW:
1692                                         dum->gadget.ep0->maxpacket = 8;
1693                                         dum->port_status |=
1694                                                 USB_PORT_STAT_LOW_SPEED;
1695                                         break;
1696                                 default:
1697                                         dum->gadget.speed = USB_SPEED_FULL;
1698                                         break;
1699                                 }
1700                         }
1701                 }
1702                 set_link_state (dum);
1703                 ((__le16 *) buf)[0] = cpu_to_le16 (dum->port_status);
1704                 ((__le16 *) buf)[1] = cpu_to_le16 (dum->port_status >> 16);
1705                 break;
1706         case SetHubFeature:
1707                 retval = -EPIPE;
1708                 break;
1709         case SetPortFeature:
1710                 switch (wValue) {
1711                 case USB_PORT_FEAT_SUSPEND:
1712                         if (dum->active) {
1713                                 dum->port_status |= USB_PORT_STAT_SUSPEND;
1714
1715                                 /* HNP would happen here; for now we
1716                                  * assume b_bus_req is always true.
1717                                  */
1718                                 set_link_state (dum);
1719                                 if (((1 << USB_DEVICE_B_HNP_ENABLE)
1720                                                 & dum->devstatus) != 0)
1721                                         dev_dbg (dummy_dev(dum),
1722                                                         "no HNP yet!\n");
1723                         }
1724                         break;
1725                 case USB_PORT_FEAT_POWER:
1726                         dum->port_status |= USB_PORT_STAT_POWER;
1727                         set_link_state (dum);
1728                         break;
1729                 case USB_PORT_FEAT_RESET:
1730                         /* if it's already enabled, disable */
1731                         dum->port_status &= ~(USB_PORT_STAT_ENABLE
1732                                         | USB_PORT_STAT_LOW_SPEED
1733                                         | USB_PORT_STAT_HIGH_SPEED);
1734                         dum->devstatus = 0;
1735                         /* 50msec reset signaling */
1736                         dum->re_timeout = jiffies + msecs_to_jiffies(50);
1737                         /* FALLS THROUGH */
1738                 default:
1739                         if ((dum->port_status & USB_PORT_STAT_POWER) != 0) {
1740                                 dum->port_status |= (1 << wValue);
1741                                 set_link_state (dum);
1742                         }
1743                 }
1744                 break;
1745
1746         default:
1747                 dev_dbg (dummy_dev(dum),
1748                         "hub control req%04x v%04x i%04x l%d\n",
1749                         typeReq, wValue, wIndex, wLength);
1750
1751                 /* "protocol stall" on error */
1752                 retval = -EPIPE;
1753         }
1754         spin_unlock_irqrestore (&dum->lock, flags);
1755
1756         if ((dum->port_status & PORT_C_MASK) != 0)
1757                 usb_hcd_poll_rh_status (hcd);
1758         return retval;
1759 }
1760
1761 static int dummy_hub_suspend (struct usb_hcd *hcd)
1762 {
1763         struct dummy *dum = hcd_to_dummy (hcd);
1764
1765         spin_lock_irq (&dum->lock);
1766         dum->rh_state = DUMMY_RH_SUSPENDED;
1767         set_link_state (dum);
1768         spin_unlock_irq (&dum->lock);
1769         return 0;
1770 }
1771
1772 static int dummy_hub_resume (struct usb_hcd *hcd)
1773 {
1774         struct dummy *dum = hcd_to_dummy (hcd);
1775
1776         spin_lock_irq (&dum->lock);
1777         dum->rh_state = DUMMY_RH_RUNNING;
1778         set_link_state (dum);
1779         if (!list_empty(&dum->urbp_list))
1780                 mod_timer (&dum->timer, jiffies);
1781         spin_unlock_irq (&dum->lock);
1782         return 0;
1783 }
1784
1785 /*-------------------------------------------------------------------------*/
1786
1787 static inline ssize_t
1788 show_urb (char *buf, size_t size, struct urb *urb)
1789 {
1790         int ep = usb_pipeendpoint (urb->pipe);
1791
1792         return snprintf (buf, size,
1793                 "urb/%p %s ep%d%s%s len %d/%d\n",
1794                 urb,
1795                 ({ char *s;
1796                  switch (urb->dev->speed) {
1797                  case USB_SPEED_LOW:    s = "ls"; break;
1798                  case USB_SPEED_FULL:   s = "fs"; break;
1799                  case USB_SPEED_HIGH:   s = "hs"; break;
1800                  default:               s = "?"; break;
1801                  }; s; }),
1802                 ep, ep ? (usb_pipein (urb->pipe) ? "in" : "out") : "",
1803                 ({ char *s; \
1804                  switch (usb_pipetype (urb->pipe)) { \
1805                  case PIPE_CONTROL:     s = ""; break; \
1806                  case PIPE_BULK:        s = "-bulk"; break; \
1807                  case PIPE_INTERRUPT:   s = "-int"; break; \
1808                  default:               s = "-iso"; break; \
1809                 }; s;}),
1810                 urb->actual_length, urb->transfer_buffer_length);
1811 }
1812
1813 static ssize_t
1814 show_urbs (struct device *dev, struct device_attribute *attr, char *buf)
1815 {
1816         struct usb_hcd          *hcd = dev_get_drvdata (dev);
1817         struct dummy            *dum = hcd_to_dummy (hcd);
1818         struct urbp             *urbp;
1819         size_t                  size = 0;
1820         unsigned long           flags;
1821
1822         spin_lock_irqsave (&dum->lock, flags);
1823         list_for_each_entry (urbp, &dum->urbp_list, urbp_list) {
1824                 size_t          temp;
1825
1826                 temp = show_urb (buf, PAGE_SIZE - size, urbp->urb);
1827                 buf += temp;
1828                 size += temp;
1829         }
1830         spin_unlock_irqrestore (&dum->lock, flags);
1831
1832         return size;
1833 }
1834 static DEVICE_ATTR (urbs, S_IRUGO, show_urbs, NULL);
1835
1836 static int dummy_start (struct usb_hcd *hcd)
1837 {
1838         struct dummy            *dum;
1839
1840         dum = hcd_to_dummy (hcd);
1841
1842         /*
1843          * MASTER side init ... we emulate a root hub that'll only ever
1844          * talk to one device (the slave side).  Also appears in sysfs,
1845          * just like more familiar pci-based HCDs.
1846          */
1847         spin_lock_init (&dum->lock);
1848         init_timer (&dum->timer);
1849         dum->timer.function = dummy_timer;
1850         dum->timer.data = (unsigned long) dum;
1851         dum->rh_state = DUMMY_RH_RUNNING;
1852
1853         INIT_LIST_HEAD (&dum->urbp_list);
1854
1855         /* only show a low-power port: just 8mA */
1856         hcd->power_budget = 8;
1857         hcd->state = HC_STATE_RUNNING;
1858         hcd->uses_new_polling = 1;
1859
1860 #ifdef CONFIG_USB_OTG
1861         hcd->self.otg_port = 1;
1862 #endif
1863
1864         /* FIXME 'urbs' should be a per-device thing, maybe in usbcore */
1865         device_create_file (dummy_dev(dum), &dev_attr_urbs);
1866         return 0;
1867 }
1868
1869 static void dummy_stop (struct usb_hcd *hcd)
1870 {
1871         struct dummy            *dum;
1872
1873         dum = hcd_to_dummy (hcd);
1874
1875         device_remove_file (dummy_dev(dum), &dev_attr_urbs);
1876         usb_gadget_unregister_driver (dum->driver);
1877         dev_info (dummy_dev(dum), "stopped\n");
1878 }
1879
1880 /*-------------------------------------------------------------------------*/
1881
1882 static int dummy_h_get_frame (struct usb_hcd *hcd)
1883 {
1884         return dummy_g_get_frame (NULL);
1885 }
1886
1887 static const struct hc_driver dummy_hcd = {
1888         .description =          (char *) driver_name,
1889         .product_desc =         "Dummy host controller",
1890         .hcd_priv_size =        sizeof(struct dummy),
1891
1892         .flags =                HCD_USB2,
1893
1894         .start =                dummy_start,
1895         .stop =                 dummy_stop,
1896
1897         .urb_enqueue =          dummy_urb_enqueue,
1898         .urb_dequeue =          dummy_urb_dequeue,
1899
1900         .get_frame_number =     dummy_h_get_frame,
1901
1902         .hub_status_data =      dummy_hub_status,
1903         .hub_control =          dummy_hub_control,
1904         .hub_suspend =          dummy_hub_suspend,
1905         .hub_resume =           dummy_hub_resume,
1906 };
1907
1908 static int dummy_hcd_probe (struct device *dev)
1909 {
1910         struct usb_hcd          *hcd;
1911         int                     retval;
1912
1913         dev_info (dev, "%s, driver " DRIVER_VERSION "\n", driver_desc);
1914
1915         hcd = usb_create_hcd (&dummy_hcd, dev, dev->bus_id);
1916         if (!hcd)
1917                 return -ENOMEM;
1918         the_controller = hcd_to_dummy (hcd);
1919
1920         retval = usb_add_hcd(hcd, 0, 0);
1921         if (retval != 0) {
1922                 usb_put_hcd (hcd);
1923                 the_controller = NULL;
1924         }
1925         return retval;
1926 }
1927
1928 static int dummy_hcd_remove (struct device *dev)
1929 {
1930         struct usb_hcd          *hcd;
1931
1932         hcd = dev_get_drvdata (dev);
1933         usb_remove_hcd (hcd);
1934         usb_put_hcd (hcd);
1935         the_controller = NULL;
1936         return 0;
1937 }
1938
1939 static int dummy_hcd_suspend (struct device *dev, pm_message_t state,
1940                 u32 level)
1941 {
1942         struct usb_hcd          *hcd;
1943
1944         if (level != SUSPEND_DISABLE)
1945                 return 0;
1946
1947         dev_dbg (dev, "%s\n", __FUNCTION__);
1948         hcd = dev_get_drvdata (dev);
1949
1950 #ifndef CONFIG_USB_SUSPEND
1951         /* Otherwise this would never happen */
1952         usb_lock_device (hcd->self.root_hub);
1953         dummy_hub_suspend (hcd);
1954         usb_unlock_device (hcd->self.root_hub);
1955 #endif
1956
1957         hcd->state = HC_STATE_SUSPENDED;
1958         return 0;
1959 }
1960
1961 static int dummy_hcd_resume (struct device *dev, u32 level)
1962 {
1963         struct usb_hcd          *hcd;
1964
1965         if (level != RESUME_ENABLE)
1966                 return 0;
1967
1968         dev_dbg (dev, "%s\n", __FUNCTION__);
1969         hcd = dev_get_drvdata (dev);
1970         hcd->state = HC_STATE_RUNNING;
1971
1972 #ifndef CONFIG_USB_SUSPEND
1973         /* Otherwise this would never happen */
1974         usb_lock_device (hcd->self.root_hub);
1975         dummy_hub_resume (hcd);
1976         usb_unlock_device (hcd->self.root_hub);
1977 #endif
1978
1979         usb_hcd_poll_rh_status (hcd);
1980         return 0;
1981 }
1982
1983 static struct device_driver dummy_hcd_driver = {
1984         .name           = (char *) driver_name,
1985         .bus            = &platform_bus_type,
1986         .probe          = dummy_hcd_probe,
1987         .remove         = dummy_hcd_remove,
1988         .suspend        = dummy_hcd_suspend,
1989         .resume         = dummy_hcd_resume,
1990 };
1991
1992 /*-------------------------------------------------------------------------*/
1993
1994 /* These don't need to do anything because the pdev structures are
1995  * statically allocated. */
1996 static void
1997 dummy_udc_release (struct device *dev) {}
1998
1999 static void
2000 dummy_hcd_release (struct device *dev) {}
2001
2002 static struct platform_device           the_udc_pdev = {
2003         .name           = (char *) gadget_name,
2004         .id             = -1,
2005         .dev            = {
2006                 .release        = dummy_udc_release,
2007         },
2008 };
2009
2010 static struct platform_device           the_hcd_pdev = {
2011         .name           = (char *) driver_name,
2012         .id             = -1,
2013         .dev            = {
2014                 .release        = dummy_hcd_release,
2015         },
2016 };
2017
2018 static int __init init (void)
2019 {
2020         int     retval;
2021
2022         if (usb_disabled ())
2023                 return -ENODEV;
2024
2025         retval = driver_register (&dummy_hcd_driver);
2026         if (retval < 0)
2027                 return retval;
2028
2029         retval = driver_register (&dummy_udc_driver);
2030         if (retval < 0)
2031                 goto err_register_udc_driver;
2032
2033         retval = platform_device_register (&the_hcd_pdev);
2034         if (retval < 0)
2035                 goto err_register_hcd;
2036
2037         retval = platform_device_register (&the_udc_pdev);
2038         if (retval < 0)
2039                 goto err_register_udc;
2040         return retval;
2041
2042 err_register_udc:
2043         platform_device_unregister (&the_hcd_pdev);
2044 err_register_hcd:
2045         driver_unregister (&dummy_udc_driver);
2046 err_register_udc_driver:
2047         driver_unregister (&dummy_hcd_driver);
2048         return retval;
2049 }
2050 module_init (init);
2051
2052 static void __exit cleanup (void)
2053 {
2054         platform_device_unregister (&the_udc_pdev);
2055         platform_device_unregister (&the_hcd_pdev);
2056         driver_unregister (&dummy_udc_driver);
2057         driver_unregister (&dummy_hcd_driver);
2058 }
2059 module_exit (cleanup);