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  "17 Dec 2004"
  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 #define FIFO_SIZE               64
 145
 146 struct urbp {
 147         struct urb              *urb;
 148         struct list_head        urbp_list;
 149 };
 150
 151 struct dummy {
 152         spinlock_t                      lock;
 153
 154         /*
 155          * SLAVE/GADGET side support
 156          */
 157         struct dummy_ep                 ep [DUMMY_ENDPOINTS];
 158         int                             address;
 159         struct usb_gadget               gadget;
 160         struct usb_gadget_driver        *driver;
 161         struct dummy_request            fifo_req;
 162         u8                              fifo_buf [FIFO_SIZE];
 163         u16                             devstatus;
 164
 165         /*
 166          * MASTER/HOST side support
 167          */
 168         struct timer_list               timer;
 169         u32                             port_status;
 170         unsigned                        resuming:1;
 171         unsigned long                   re_timeout;
 172
 173         struct usb_device               *udev;
 174         struct list_head                urbp_list;
 175 };
 176
 177 static inline struct dummy *hcd_to_dummy (struct usb_hcd *hcd)
 178 {
 179         return (struct dummy *) (hcd->hcd_priv);
 180 }
 181
 182 static inline struct usb_hcd *dummy_to_hcd (struct dummy *dum)
 183 {
 184         return container_of((void *) dum, struct usb_hcd, hcd_priv);
 185 }
 186
 187 static inline struct device *dummy_dev (struct dummy *dum)
 188 {
 189         return dummy_to_hcd(dum)->self.controller;
 190 }
 191
 192 static inline struct dummy *ep_to_dummy (struct dummy_ep *ep)
 193 {
 194         return container_of (ep->gadget, struct dummy, gadget);
 195 }
 196
 197 static inline struct dummy *gadget_to_dummy (struct usb_gadget *gadget)
 198 {
 199         return container_of (gadget, struct dummy, gadget);
 200 }
 201
 202 static inline struct dummy *gadget_dev_to_dummy (struct device *dev)
 203 {
 204         return container_of (dev, struct dummy, gadget.dev);
 205 }
 206
 207 static struct dummy                     *the_controller;
 208
 209 /*-------------------------------------------------------------------------*/
 210
 211 /*
 212  * This "hardware" may look a bit odd in diagnostics since it's got both
 213  * host and device sides; and it binds different drivers to each side.
 214  */
 215 static struct platform_device           the_pdev;
 216
 217 static struct device_driver dummy_driver = {
 218         .name           = (char *) driver_name,
 219         .bus            = &platform_bus_type,
 220 };
 221
 222 /*-------------------------------------------------------------------------*/
 223
 224 /* SLAVE/GADGET SIDE DRIVER
 225  *
 226  * This only tracks gadget state.  All the work is done when the host
 227  * side tries some (emulated) i/o operation.  Real device controller
 228  * drivers would do real i/o using dma, fifos, irqs, timers, etc.
 229  */
 230
 231 #define is_enabled(dum) \
 232         (dum->port_status & USB_PORT_STAT_ENABLE)
 233
 234 static int
 235 dummy_enable (struct usb_ep *_ep, const struct usb_endpoint_descriptor *desc)
 236 {
 237         struct dummy            *dum;
 238         struct dummy_ep         *ep;
 239         unsigned                max;
 240         int                     retval;
 241
 242         ep = usb_ep_to_dummy_ep (_ep);
 243         if (!_ep || !desc || ep->desc || _ep->name == ep0name
 244                         || desc->bDescriptorType != USB_DT_ENDPOINT)
 245                 return -EINVAL;
 246         dum = ep_to_dummy (ep);
 247         if (!dum->driver || !is_enabled (dum))
 248                 return -ESHUTDOWN;
 249         max = le16_to_cpu(desc->wMaxPacketSize) & 0x3ff;
 250
 251         /* drivers must not request bad settings, since lower levels
 252          * (hardware or its drivers) may not check.  some endpoints
 253          * can't do iso, many have maxpacket limitations, etc.
 254          *
 255          * since this "hardware" driver is here to help debugging, we
 256          * have some extra sanity checks.  (there could be more though,
 257          * especially for "ep9out" style fixed function ones.)
 258          */
 259         retval = -EINVAL;
 260         switch (desc->bmAttributes & 0x03) {
 261         case USB_ENDPOINT_XFER_BULK:
 262                 if (strstr (ep->ep.name, "-iso")
 263                                 || strstr (ep->ep.name, "-int")) {
 264                         goto done;
 265                 }
 266                 switch (dum->gadget.speed) {
 267                 case USB_SPEED_HIGH:
 268                         if (max == 512)
 269                                 break;
 270                         /* conserve return statements */
 271                 default:
 272                         switch (max) {
 273                         case 8: case 16: case 32: case 64:
 274                                 /* we'll fake any legal size */
 275                                 break;
 276                         default:
 277                 case USB_SPEED_LOW:
 278                                 goto done;
 279                         }
 280                 }
 281                 break;
 282         case USB_ENDPOINT_XFER_INT:
 283                 if (strstr (ep->ep.name, "-iso")) /* bulk is ok */
 284                         goto done;
 285                 /* real hardware might not handle all packet sizes */
 286                 switch (dum->gadget.speed) {
 287                 case USB_SPEED_HIGH:
 288                         if (max <= 1024)
 289                                 break;
 290                         /* save a return statement */
 291                 case USB_SPEED_FULL:
 292                         if (max <= 64)
 293                                 break;
 294                         /* save a return statement */
 295                 default:
 296                         if (max <= 8)
 297                                 break;
 298                         goto done;
 299                 }
 300                 break;
 301         case USB_ENDPOINT_XFER_ISOC:
 302                 if (strstr (ep->ep.name, "-bulk")
 303                                 || strstr (ep->ep.name, "-int"))
 304                         goto done;
 305                 /* real hardware might not handle all packet sizes */
 306                 switch (dum->gadget.speed) {
 307                 case USB_SPEED_HIGH:
 308                         if (max <= 1024)
 309                                 break;
 310                         /* save a return statement */
 311                 case USB_SPEED_FULL:
 312                         if (max <= 1023)
 313                                 break;
 314                         /* save a return statement */
 315                 default:
 316                         goto done;
 317                 }
 318                 break;
 319         default:
 320                 /* few chips support control except on ep0 */
 321                 goto done;
 322         }
 323
 324         _ep->maxpacket = max;
 325         ep->desc = desc;
 326
 327         dev_dbg (dummy_dev(dum), "enabled %s (ep%d%s-%s) maxpacket %d\n",
 328                 _ep->name,
 329                 desc->bEndpointAddress & 0x0f,
 330                 (desc->bEndpointAddress & USB_DIR_IN) ? "in" : "out",
 331                 ({ char *val;
 332                  switch (desc->bmAttributes & 0x03) {
 333                  case USB_ENDPOINT_XFER_BULK: val = "bulk"; break;
 334                  case USB_ENDPOINT_XFER_ISOC: val = "iso"; break;
 335                  case USB_ENDPOINT_XFER_INT: val = "intr"; break;
 336                  default: val = "ctrl"; break;
 337                  }; val; }),
 338                 max);
 339
 340         /* at this point real hardware should be NAKing transfers
 341          * to that endpoint, until a buffer is queued to it.
 342          */
 343         retval = 0;
 344 done:
 345         return retval;
 346 }
 347
 348 /* called with spinlock held */
 349 static void nuke (struct dummy *dum, struct dummy_ep *ep)
 350 {
 351         while (!list_empty (&ep->queue)) {
 352                 struct dummy_request    *req;
 353
 354                 req = list_entry (ep->queue.next, struct dummy_request, queue);
 355                 list_del_init (&req->queue);
 356                 req->req.status = -ESHUTDOWN;
 357
 358                 spin_unlock (&dum->lock);
 359                 req->req.complete (&ep->ep, &req->req);
 360                 spin_lock (&dum->lock);
 361         }
 362 }
 363
 364 static int dummy_disable (struct usb_ep *_ep)
 365 {
 366         struct dummy_ep         *ep;
 367         struct dummy            *dum;
 368         unsigned long           flags;
 369         int                     retval;
 370
 371         ep = usb_ep_to_dummy_ep (_ep);
 372         if (!_ep || !ep->desc || _ep->name == ep0name)
 373                 return -EINVAL;
 374         dum = ep_to_dummy (ep);
 375
 376         spin_lock_irqsave (&dum->lock, flags);
 377         ep->desc = NULL;
 378         retval = 0;
 379         nuke (dum, ep);
 380         spin_unlock_irqrestore (&dum->lock, flags);
 381
 382         dev_dbg (dummy_dev(dum), "disabled %s\n", _ep->name);
 383         return retval;
 384 }
 385
 386 static struct usb_request *
 387 dummy_alloc_request (struct usb_ep *_ep, int mem_flags)
 388 {
 389         struct dummy_ep         *ep;
 390         struct dummy_request    *req;
 391
 392         if (!_ep)
 393                 return NULL;
 394         ep = usb_ep_to_dummy_ep (_ep);
 395
 396         req = kmalloc (sizeof *req, mem_flags);
 397         if (!req)
 398                 return NULL;
 399         memset (req, 0, sizeof *req);
 400         INIT_LIST_HEAD (&req->queue);
 401         return &req->req;
 402 }
 403
 404 static void
 405 dummy_free_request (struct usb_ep *_ep, struct usb_request *_req)
 406 {
 407         struct dummy_ep         *ep;
 408         struct dummy_request    *req;
 409
 410         ep = usb_ep_to_dummy_ep (_ep);
 411         if (!ep || !_req || (!ep->desc && _ep->name != ep0name))
 412                 return;
 413
 414         req = usb_request_to_dummy_request (_req);
 415         WARN_ON (!list_empty (&req->queue));
 416         kfree (req);
 417 }
 418
 419 static void *
 420 dummy_alloc_buffer (
 421         struct usb_ep *_ep,
 422         unsigned bytes,
 423         dma_addr_t *dma,
 424         int mem_flags
 425 ) {
 426         char                    *retval;
 427         struct dummy_ep         *ep;
 428         struct dummy            *dum;
 429
 430         ep = usb_ep_to_dummy_ep (_ep);
 431         dum = ep_to_dummy (ep);
 432
 433         if (!dum->driver)
 434                 return NULL;
 435         retval = kmalloc (bytes, mem_flags);
 436         *dma = (dma_addr_t) retval;
 437         return retval;
 438 }
 439
 440 static void
 441 dummy_free_buffer (
 442         struct usb_ep *_ep,
 443         void *buf,
 444         dma_addr_t dma,
 445         unsigned bytes
 446 ) {
 447         if (bytes)
 448                 kfree (buf);
 449 }
 450
 451 static void
 452 fifo_complete (struct usb_ep *ep, struct usb_request *req)
 453 {
 454 }
 455
 456 static int
 457 dummy_queue (struct usb_ep *_ep, struct usb_request *_req, int mem_flags)
 458 {
 459         struct dummy_ep         *ep;
 460         struct dummy_request    *req;
 461         struct dummy            *dum;
 462         unsigned long           flags;
 463
 464         req = usb_request_to_dummy_request (_req);
 465         if (!_req || !list_empty (&req->queue) || !_req->complete)
 466                 return -EINVAL;
 467
 468         ep = usb_ep_to_dummy_ep (_ep);
 469         if (!_ep || (!ep->desc && _ep->name != ep0name))
 470                 return -EINVAL;
 471
 472         dum = ep_to_dummy (ep);
 473         if (!dum->driver || !is_enabled (dum))
 474                 return -ESHUTDOWN;
 475
 476 #if 0
 477         dev_dbg (dummy_dev(dum), "ep %p queue req %p to %s, len %d buf %p\n",
 478                         ep, _req, _ep->name, _req->length, _req->buf);
 479 #endif
 480
 481         _req->status = -EINPROGRESS;
 482         _req->actual = 0;
 483         spin_lock_irqsave (&dum->lock, flags);
 484
 485         /* implement an emulated single-request FIFO */
 486         if (ep->desc && (ep->desc->bEndpointAddress & USB_DIR_IN) &&
 487                         list_empty (&dum->fifo_req.queue) &&
 488                         list_empty (&ep->queue) &&
 489                         _req->length <= FIFO_SIZE) {
 490                 req = &dum->fifo_req;
 491                 req->req = *_req;
 492                 req->req.buf = dum->fifo_buf;
 493                 memcpy (dum->fifo_buf, _req->buf, _req->length);
 494                 req->req.context = dum;
 495                 req->req.complete = fifo_complete;
 496
 497                 spin_unlock (&dum->lock);
 498                 _req->actual = _req->length;
 499                 _req->status = 0;
 500                 _req->complete (_ep, _req);
 501                 spin_lock (&dum->lock);
 502         }
 503         list_add_tail (&req->queue, &ep->queue);
 504         spin_unlock_irqrestore (&dum->lock, flags);
 505
 506         /* real hardware would likely enable transfers here, in case
 507          * it'd been left NAKing.
 508          */
 509         return 0;
 510 }
 511
 512 static int dummy_dequeue (struct usb_ep *_ep, struct usb_request *_req)
 513 {
 514         struct dummy_ep         *ep;
 515         struct dummy            *dum;
 516         int                     retval = -EINVAL;
 517         unsigned long           flags;
 518         struct dummy_request    *req = NULL;
 519
 520         if (!_ep || !_req)
 521                 return retval;
 522         ep = usb_ep_to_dummy_ep (_ep);
 523         dum = ep_to_dummy (ep);
 524
 525         if (!dum->driver)
 526                 return -ESHUTDOWN;
 527
 528         spin_lock_irqsave (&dum->lock, flags);
 529         list_for_each_entry (req, &ep->queue, queue) {
 530                 if (&req->req == _req) {
 531                         list_del_init (&req->queue);
 532                         _req->status = -ECONNRESET;
 533                         retval = 0;
 534                         break;
 535                 }
 536         }
 537         spin_unlock_irqrestore (&dum->lock, flags);
 538
 539         if (retval == 0) {
 540                 dev_dbg (dummy_dev(dum),
 541                                 "dequeued req %p from %s, len %d buf %p\n",
 542                                 req, _ep->name, _req->length, _req->buf);
 543                 _req->complete (_ep, _req);
 544         }
 545         return retval;
 546 }
 547
 548 static int
 549 dummy_set_halt (struct usb_ep *_ep, int value)
 550 {
 551         struct dummy_ep         *ep;
 552         struct dummy            *dum;
 553
 554         if (!_ep)
 555                 return -EINVAL;
 556         ep = usb_ep_to_dummy_ep (_ep);
 557         dum = ep_to_dummy (ep);
 558         if (!dum->driver)
 559                 return -ESHUTDOWN;
 560         if (!value)
 561                 ep->halted = 0;
 562         else if (ep->desc && (ep->desc->bEndpointAddress & USB_DIR_IN) &&
 563                         !list_empty (&ep->queue))
 564                 return -EAGAIN;
 565         else
 566                 ep->halted = 1;
 567         /* FIXME clear emulated data toggle too */
 568         return 0;
 569 }
 570
 571 static const struct usb_ep_ops dummy_ep_ops = {
 572         .enable         = dummy_enable,
 573         .disable        = dummy_disable,
 574
 575         .alloc_request  = dummy_alloc_request,
 576         .free_request   = dummy_free_request,
 577
 578         .alloc_buffer   = dummy_alloc_buffer,
 579         .free_buffer    = dummy_free_buffer,
 580         /* map, unmap, ... eventually hook the "generic" dma calls */
 581
 582         .queue          = dummy_queue,
 583         .dequeue        = dummy_dequeue,
 584
 585         .set_halt       = dummy_set_halt,
 586 };
 587
 588 /*-------------------------------------------------------------------------*/
 589
 590 /* there are both host and device side versions of this call ... */
 591 static int dummy_g_get_frame (struct usb_gadget *_gadget)
 592 {
 593         struct timeval  tv;
 594
 595         do_gettimeofday (&tv);
 596         return tv.tv_usec / 1000;
 597 }
 598
 599 static int dummy_wakeup (struct usb_gadget *_gadget)
 600 {
 601         struct dummy    *dum;
 602
 603         dum = gadget_to_dummy (_gadget);
 604         if ((dum->devstatus & (1 << USB_DEVICE_REMOTE_WAKEUP)) == 0
 605                         || !(dum->port_status & (1 << USB_PORT_FEAT_SUSPEND)))
 606                 return -EINVAL;
 607
 608         /* hub notices our request, issues downstream resume, etc */
 609         dum->resuming = 1;
 610         dum->port_status |= (1 << USB_PORT_FEAT_C_SUSPEND);
 611         return 0;
 612 }
 613
 614 static int dummy_set_selfpowered (struct usb_gadget *_gadget, int value)
 615 {
 616         struct dummy    *dum;
 617
 618         dum = gadget_to_dummy (_gadget);
 619         if (value)
 620                 dum->devstatus |= (1 << USB_DEVICE_SELF_POWERED);
 621         else
 622                 dum->devstatus &= ~(1 << USB_DEVICE_SELF_POWERED);
 623         return 0;
 624 }
 625
 626 static const struct usb_gadget_ops dummy_ops = {
 627         .get_frame      = dummy_g_get_frame,
 628         .wakeup         = dummy_wakeup,
 629         .set_selfpowered = dummy_set_selfpowered,
 630 };
 631
 632 /*-------------------------------------------------------------------------*/
 633
 634 /* "function" sysfs attribute */
 635 static ssize_t
 636 show_function (struct device *dev, char *buf)
 637 {
 638         struct dummy    *dum = gadget_dev_to_dummy (dev);
 639
 640         if (!dum->driver || !dum->driver->function)
 641                 return 0;
 642         return scnprintf (buf, PAGE_SIZE, "%s\n", dum->driver->function);
 643 }
 644 DEVICE_ATTR (function, S_IRUGO, show_function, NULL);
 645
 646 /*-------------------------------------------------------------------------*/
 647
 648 /*
 649  * Driver registration/unregistration.
 650  *
 651  * This is basically hardware-specific; there's usually only one real USB
 652  * device (not host) controller since that's how USB devices are intended
 653  * to work.  So most implementations of these api calls will rely on the
 654  * fact that only one driver will ever bind to the hardware.  But curious
 655  * hardware can be built with discrete components, so the gadget API doesn't
 656  * require that assumption.
 657  *
 658  * For this emulator, it might be convenient to create a usb slave device
 659  * for each driver that registers:  just add to a big root hub.
 660  */
 661
 662 static void
 663 dummy_udc_release (struct device *dev)
 664 {
 665 }
 666
 667 static void
 668 dummy_pdev_release (struct device *dev)
 669 {
 670 }
 671
 672 static int
 673 dummy_register_udc (struct dummy *dum)
 674 {
 675         int             rc;
 676
 677         strcpy (dum->gadget.dev.bus_id, "udc");
 678         dum->gadget.dev.parent = dummy_dev(dum);
 679         dum->gadget.dev.release = dummy_udc_release;
 680
 681         rc = device_register (&dum->gadget.dev);
 682         if (rc == 0)
 683                 device_create_file (&dum->gadget.dev, &dev_attr_function);
 684         return rc;
 685 }
 686
 687 static void
 688 dummy_unregister_udc (struct dummy *dum)
 689 {
 690         device_remove_file (&dum->gadget.dev, &dev_attr_function);
 691         device_unregister (&dum->gadget.dev);
 692 }
 693
 694 int
 695 usb_gadget_register_driver (struct usb_gadget_driver *driver)
 696 {
 697         struct dummy    *dum = the_controller;
 698         int             retval, i;
 699
 700         if (!dum)
 701                 return -EINVAL;
 702         if (dum->driver)
 703                 return -EBUSY;
 704         if (!driver->bind || !driver->unbind || !driver->setup
 705                         || driver->speed == USB_SPEED_UNKNOWN)
 706                 return -EINVAL;
 707
 708         /*
 709          * SLAVE side init ... the layer above hardware, which
 710          * can't enumerate without help from the driver we're binding.
 711          */
 712         dum->gadget.name = gadget_name;
 713         dum->gadget.ops = &dummy_ops;
 714         dum->gadget.is_dualspeed = 1;
 715
 716         dum->devstatus = 0;
 717         dum->resuming = 0;
 718
 719         INIT_LIST_HEAD (&dum->gadget.ep_list);
 720         for (i = 0; i < DUMMY_ENDPOINTS; i++) {
 721                 struct dummy_ep *ep = &dum->ep [i];
 722
 723                 if (!ep_name [i])
 724                         break;
 725                 ep->ep.name = ep_name [i];
 726                 ep->ep.ops = &dummy_ep_ops;
 727                 list_add_tail (&ep->ep.ep_list, &dum->gadget.ep_list);
 728                 ep->halted = ep->already_seen = ep->setup_stage = 0;
 729                 ep->ep.maxpacket = ~0;
 730                 ep->last_io = jiffies;
 731                 ep->gadget = &dum->gadget;
 732                 ep->desc = NULL;
 733                 INIT_LIST_HEAD (&ep->queue);
 734         }
 735
 736         dum->gadget.ep0 = &dum->ep [0].ep;
 737         dum->ep [0].ep.maxpacket = 64;
 738         list_del_init (&dum->ep [0].ep.ep_list);
 739         INIT_LIST_HEAD(&dum->fifo_req.queue);
 740
 741         dum->driver = driver;
 742         dum->gadget.dev.driver = &driver->driver;
 743         dev_dbg (dummy_dev(dum), "binding gadget driver '%s'\n",
 744                         driver->driver.name);
 745         if ((retval = driver->bind (&dum->gadget)) != 0) {
 746                 dum->driver = NULL;
 747                 dum->gadget.dev.driver = NULL;
 748                 return retval;
 749         }
 750
 751         // FIXME: Check these calls for errors and re-order
 752         driver->driver.bus = dum->gadget.dev.parent->bus;
 753         driver_register (&driver->driver);
 754
 755         device_bind_driver (&dum->gadget.dev);
 756
 757         /* khubd will enumerate this in a while */
 758         dum->port_status |= USB_PORT_STAT_CONNECTION
 759                 | (1 << USB_PORT_FEAT_C_CONNECTION);
 760         return 0;
 761 }
 762 EXPORT_SYMBOL (usb_gadget_register_driver);
 763
 764 /* caller must hold lock */
 765 static void
 766 stop_activity (struct dummy *dum, struct usb_gadget_driver *driver)
 767 {
 768         struct dummy_ep *ep;
 769
 770         /* prevent any more requests */
 771         dum->address = 0;
 772
 773         /* The timer is left running so that outstanding URBs can fail */
 774
 775         /* nuke any pending requests first, so driver i/o is quiesced */
 776         list_for_each_entry (ep, &dum->gadget.ep_list, ep.ep_list)
 777                 nuke (dum, ep);
 778
 779         /* driver now does any non-usb quiescing necessary */
 780         if (driver) {
 781                 spin_unlock (&dum->lock);
 782                 driver->disconnect (&dum->gadget);
 783                 spin_lock (&dum->lock);
 784         }
 785 }
 786
 787 int
 788 usb_gadget_unregister_driver (struct usb_gadget_driver *driver)
 789 {
 790         struct dummy    *dum = the_controller;
 791         unsigned long   flags;
 792
 793         if (!dum)
 794                 return -ENODEV;
 795         if (!driver || driver != dum->driver)
 796                 return -EINVAL;
 797
 798         dev_dbg (dummy_dev(dum), "unregister gadget driver '%s'\n",
 799                         driver->driver.name);
 800
 801         spin_lock_irqsave (&dum->lock, flags);
 802         stop_activity (dum, driver);
 803         dum->port_status &= ~(USB_PORT_STAT_CONNECTION | USB_PORT_STAT_ENABLE |
 804                         USB_PORT_STAT_LOW_SPEED | USB_PORT_STAT_HIGH_SPEED);
 805         dum->port_status |= (1 << USB_PORT_FEAT_C_CONNECTION);
 806         spin_unlock_irqrestore (&dum->lock, flags);
 807
 808         driver->unbind (&dum->gadget);
 809         dum->driver = NULL;
 810
 811         device_release_driver (&dum->gadget.dev);
 812
 813         driver_unregister (&driver->driver);
 814
 815         return 0;
 816 }
 817 EXPORT_SYMBOL (usb_gadget_unregister_driver);
 818
 819 #undef is_enabled
 820
 821 int net2280_set_fifo_mode (struct usb_gadget *gadget, int mode)
 822 {
 823         return -ENOSYS;
 824 }
 825 EXPORT_SYMBOL (net2280_set_fifo_mode);
 826
 827 /*-------------------------------------------------------------------------*/
 828
 829 /* MASTER/HOST SIDE DRIVER
 830  *
 831  * this uses the hcd framework to hook up to host side drivers.
 832  * its root hub will only have one device, otherwise it acts like
 833  * a normal host controller.
 834  *
 835  * when urbs are queued, they're just stuck on a list that we
 836  * scan in a timer callback.  that callback connects writes from
 837  * the host with reads from the device, and so on, based on the
 838  * usb 2.0 rules.
 839  */
 840
 841 static int dummy_urb_enqueue (
 842         struct usb_hcd                  *hcd,
 843         struct usb_host_endpoint        *ep,
 844         struct urb                      *urb,
 845         int                             mem_flags
 846 ) {
 847         struct dummy    *dum;
 848         struct urbp     *urbp;
 849         unsigned long   flags;
 850
 851         if (!urb->transfer_buffer && urb->transfer_buffer_length)
 852                 return -EINVAL;
 853
 854         urbp = kmalloc (sizeof *urbp, mem_flags);
 855         if (!urbp)
 856                 return -ENOMEM;
 857         urbp->urb = urb;
 858
 859         dum = hcd_to_dummy (hcd);
 860         spin_lock_irqsave (&dum->lock, flags);
 861
 862         if (!dum->udev) {
 863                 dum->udev = urb->dev;
 864                 usb_get_dev (dum->udev);
 865         } else if (unlikely (dum->udev != urb->dev))
 866                 dev_err (dummy_dev(dum), "usb_device address has changed!\n");
 867
 868         list_add_tail (&urbp->urbp_list, &dum->urbp_list);
 869         urb->hcpriv = urbp;
 870         if (usb_pipetype (urb->pipe) == PIPE_CONTROL)
 871                 urb->error_count = 1;           /* mark as a new urb */
 872
 873         /* kick the scheduler, it'll do the rest */
 874         if (!timer_pending (&dum->timer))
 875                 mod_timer (&dum->timer, jiffies + 1);
 876
 877         spin_unlock_irqrestore (&dum->lock, flags);
 878         return 0;
 879 }
 880
 881 static int dummy_urb_dequeue (struct usb_hcd *hcd, struct urb *urb)
 882 {
 883         /* giveback happens automatically in timer callback */
 884         return 0;
 885 }
 886
 887 static void maybe_set_status (struct urb *urb, int status)
 888 {
 889         spin_lock (&urb->lock);
 890         if (urb->status == -EINPROGRESS)
 891                 urb->status = status;
 892         spin_unlock (&urb->lock);
 893 }
 894
 895 /* transfer up to a frame's worth; caller must own lock */
 896 static int
 897 transfer (struct dummy *dum, struct urb *urb, struct dummy_ep *ep, int limit)
 898 {
 899         struct dummy_request    *req;
 900
 901 top:
 902         /* if there's no request queued, the device is NAKing; return */
 903         list_for_each_entry (req, &ep->queue, queue) {
 904                 unsigned        host_len, dev_len, len;
 905                 int             is_short, to_host;
 906                 int             rescan = 0;
 907
 908                 /* 1..N packets of ep->ep.maxpacket each ... the last one
 909                  * may be short (including zero length).
 910                  *
 911                  * writer can send a zlp explicitly (length 0) or implicitly
 912                  * (length mod maxpacket zero, and 'zero' flag); they always
 913                  * terminate reads.
 914                  */
 915                 host_len = urb->transfer_buffer_length - urb->actual_length;
 916                 dev_len = req->req.length - req->req.actual;
 917                 len = min (host_len, dev_len);
 918
 919                 /* FIXME update emulated data toggle too */
 920
 921                 to_host = usb_pipein (urb->pipe);
 922                 if (unlikely (len == 0))
 923                         is_short = 1;
 924                 else {
 925                         char            *ubuf, *rbuf;
 926
 927                         /* not enough bandwidth left? */
 928                         if (limit < ep->ep.maxpacket && limit < len)
 929                                 break;
 930                         len = min (len, (unsigned) limit);
 931                         if (len == 0)
 932                                 break;
 933
 934                         /* use an extra pass for the final short packet */
 935                         if (len > ep->ep.maxpacket) {
 936                                 rescan = 1;
 937                                 len -= (len % ep->ep.maxpacket);
 938                         }
 939                         is_short = (len % ep->ep.maxpacket) != 0;
 940
 941                         /* else transfer packet(s) */
 942                         ubuf = urb->transfer_buffer + urb->actual_length;
 943                         rbuf = req->req.buf + req->req.actual;
 944                         if (to_host)
 945                                 memcpy (ubuf, rbuf, len);
 946                         else
 947                                 memcpy (rbuf, ubuf, len);
 948                         ep->last_io = jiffies;
 949
 950                         limit -= len;
 951                         urb->actual_length += len;
 952                         req->req.actual += len;
 953                 }
 954
 955                 /* short packets terminate, maybe with overflow/underflow.
 956                  * it's only really an error to write too much.
 957                  *
 958                  * partially filling a buffer optionally blocks queue advances
 959                  * (so completion handlers can clean up the queue) but we don't
 960                  * need to emulate such data-in-flight.  so we only show part
 961                  * of the URB_SHORT_NOT_OK effect: completion status.
 962                  */
 963                 if (is_short) {
 964                         if (host_len == dev_len) {
 965                                 req->req.status = 0;
 966                                 maybe_set_status (urb, 0);
 967                         } else if (to_host) {
 968                                 req->req.status = 0;
 969                                 if (dev_len > host_len)
 970                                         maybe_set_status (urb, -EOVERFLOW);
 971                                 else
 972                                         maybe_set_status (urb,
 973                                                 (urb->transfer_flags
 974                                                         & URB_SHORT_NOT_OK)
 975                                                 ? -EREMOTEIO : 0);
 976                         } else if (!to_host) {
 977                                 maybe_set_status (urb, 0);
 978                                 if (host_len > dev_len)
 979                                         req->req.status = -EOVERFLOW;
 980                                 else
 981                                         req->req.status = 0;
 982                         }
 983
 984                 /* many requests terminate without a short packet */
 985                 } else {
 986                         if (req->req.length == req->req.actual
 987                                         && !req->req.zero)
 988                                 req->req.status = 0;
 989                         if (urb->transfer_buffer_length == urb->actual_length
 990                                         && !(urb->transfer_flags
 991                                                 & URB_ZERO_PACKET)) {
 992                                 maybe_set_status (urb, 0);
 993                         }
 994                 }
 995
 996                 /* device side completion --> continuable */
 997                 if (req->req.status != -EINPROGRESS) {
 998                         list_del_init (&req->queue);
 999
1000                         spin_unlock (&dum->lock);
1001                         req->req.complete (&ep->ep, &req->req);
1002                         spin_lock (&dum->lock);
1003
1004                         /* requests might have been unlinked... */
1005                         rescan = 1;
1006                 }
1007
1008                 /* host side completion --> terminate */
1009                 if (urb->status != -EINPROGRESS)
1010                         break;
1011
1012                 /* rescan to continue with any other queued i/o */
1013                 if (rescan)
1014                         goto top;
1015         }
1016         return limit;
1017 }
1018
1019 static int periodic_bytes (struct dummy *dum, struct dummy_ep *ep)
1020 {
1021         int     limit = ep->ep.maxpacket;
1022
1023         if (dum->gadget.speed == USB_SPEED_HIGH) {
1024                 int     tmp;
1025
1026                 /* high bandwidth mode */
1027                 tmp = le16_to_cpu(ep->desc->wMaxPacketSize);
1028                 tmp = le16_to_cpu (tmp);
1029                 tmp = (tmp >> 11) & 0x03;
1030                 tmp *= 8 /* applies to entire frame */;
1031                 limit += limit * tmp;
1032         }
1033         return limit;
1034 }
1035
1036 #define is_active(dum)  ((dum->port_status & \
1037                 (USB_PORT_STAT_CONNECTION | USB_PORT_STAT_ENABLE | \
1038                         USB_PORT_STAT_SUSPEND)) \
1039                 == (USB_PORT_STAT_CONNECTION | USB_PORT_STAT_ENABLE))
1040
1041 static struct dummy_ep *find_endpoint (struct dummy *dum, u8 address)
1042 {
1043         int             i;
1044
1045         if (!is_active (dum))
1046                 return NULL;
1047         if ((address & ~USB_DIR_IN) == 0)
1048                 return &dum->ep [0];
1049         for (i = 1; i < DUMMY_ENDPOINTS; i++) {
1050                 struct dummy_ep *ep = &dum->ep [i];
1051
1052                 if (!ep->desc)
1053                         continue;
1054                 if (ep->desc->bEndpointAddress == address)
1055                         return ep;
1056         }
1057         return NULL;
1058 }
1059
1060 #undef is_active
1061
1062 #define Dev_Request     (USB_TYPE_STANDARD | USB_RECIP_DEVICE)
1063 #define Dev_InRequest   (Dev_Request | USB_DIR_IN)
1064 #define Intf_Request    (USB_TYPE_STANDARD | USB_RECIP_INTERFACE)
1065 #define Intf_InRequest  (Intf_Request | USB_DIR_IN)
1066 #define Ep_Request      (USB_TYPE_STANDARD | USB_RECIP_ENDPOINT)
1067 #define Ep_InRequest    (Ep_Request | USB_DIR_IN)
1068
1069 /* drive both sides of the transfers; looks like irq handlers to
1070  * both drivers except the callbacks aren't in_irq().
1071  */
1072 static void dummy_timer (unsigned long _dum)
1073 {
1074         struct dummy            *dum = (struct dummy *) _dum;
1075         struct urbp             *urbp, *tmp;
1076         unsigned long           flags;
1077         int                     limit, total;
1078         int                     i;
1079
1080         /* simplistic model for one frame's bandwidth */
1081         switch (dum->gadget.speed) {
1082         case USB_SPEED_LOW:
1083                 total = 8/*bytes*/ * 12/*packets*/;
1084                 break;
1085         case USB_SPEED_FULL:
1086                 total = 64/*bytes*/ * 19/*packets*/;
1087                 break;
1088         case USB_SPEED_HIGH:
1089                 total = 512/*bytes*/ * 13/*packets*/ * 8/*uframes*/;
1090                 break;
1091         default:
1092                 dev_err (dummy_dev(dum), "bogus device speed\n");
1093                 return;
1094         }
1095
1096         /* FIXME if HZ != 1000 this will probably misbehave ... */
1097
1098         /* look at each urb queued by the host side driver */
1099         spin_lock_irqsave (&dum->lock, flags);
1100
1101         if (!dum->udev) {
1102                 dev_err (dummy_dev(dum),
1103                                 "timer fired with no URBs pending?\n");
1104                 spin_unlock_irqrestore (&dum->lock, flags);
1105                 return;
1106         }
1107
1108         for (i = 0; i < DUMMY_ENDPOINTS; i++) {
1109                 if (!ep_name [i])
1110                         break;
1111                 dum->ep [i].already_seen = 0;
1112         }
1113
1114 restart:
1115         list_for_each_entry_safe (urbp, tmp, &dum->urbp_list, urbp_list) {
1116                 struct urb              *urb;
1117                 struct dummy_request    *req;
1118                 u8                      address;
1119                 struct dummy_ep         *ep = NULL;
1120                 int                     type;
1121
1122                 urb = urbp->urb;
1123                 if (urb->status != -EINPROGRESS) {
1124                         /* likely it was just unlinked */
1125                         goto return_urb;
1126                 }
1127                 type = usb_pipetype (urb->pipe);
1128
1129                 /* used up this frame's non-periodic bandwidth?
1130                  * FIXME there's infinite bandwidth for control and
1131                  * periodic transfers ... unrealistic.
1132                  */
1133                 if (total <= 0 && type == PIPE_BULK)
1134                         continue;
1135
1136                 /* find the gadget's ep for this request (if configured) */
1137                 address = usb_pipeendpoint (urb->pipe);
1138                 if (usb_pipein (urb->pipe))
1139                         address |= USB_DIR_IN;
1140                 ep = find_endpoint(dum, address);
1141                 if (!ep) {
1142                         /* set_configuration() disagreement */
1143                         dev_dbg (dummy_dev(dum),
1144                                 "no ep configured for urb %p\n",
1145                                 urb);
1146                         maybe_set_status (urb, -EPROTO);
1147                         goto return_urb;
1148                 }
1149
1150                 if (ep->already_seen)
1151                         continue;
1152                 ep->already_seen = 1;
1153                 if (ep == &dum->ep [0] && urb->error_count) {
1154                         ep->setup_stage = 1;    /* a new urb */
1155                         urb->error_count = 0;
1156                 }
1157                 if (ep->halted && !ep->setup_stage) {
1158                         /* NOTE: must not be iso! */
1159                         dev_dbg (dummy_dev(dum), "ep %s halted, urb %p\n",
1160                                         ep->ep.name, urb);
1161                         maybe_set_status (urb, -EPIPE);
1162                         goto return_urb;
1163                 }
1164                 /* FIXME make sure both ends agree on maxpacket */
1165
1166                 /* handle control requests */
1167                 if (ep == &dum->ep [0] && ep->setup_stage) {
1168                         struct usb_ctrlrequest          setup;
1169                         int                             value = 1;
1170                         struct dummy_ep                 *ep2;
1171
1172                         setup = *(struct usb_ctrlrequest*) urb->setup_packet;
1173                         le16_to_cpus (&setup.wIndex);
1174                         le16_to_cpus (&setup.wValue);
1175                         le16_to_cpus (&setup.wLength);
1176                         if (setup.wLength != urb->transfer_buffer_length) {
1177                                 maybe_set_status (urb, -EOVERFLOW);
1178                                 goto return_urb;
1179                         }
1180
1181                         /* paranoia, in case of stale queued data */
1182                         list_for_each_entry (req, &ep->queue, queue) {
1183                                 list_del_init (&req->queue);
1184                                 req->req.status = -EOVERFLOW;
1185                                 dev_dbg (dummy_dev(dum), "stale req = %p\n",
1186                                                 req);
1187
1188                                 spin_unlock (&dum->lock);
1189                                 req->req.complete (&ep->ep, &req->req);
1190                                 spin_lock (&dum->lock);
1191                                 ep->already_seen = 0;
1192                                 goto restart;
1193                         }
1194
1195                         /* gadget driver never sees set_address or operations
1196                          * on standard feature flags.  some hardware doesn't
1197                          * even expose them.
1198                          */
1199                         ep->last_io = jiffies;
1200                         ep->setup_stage = 0;
1201                         ep->halted = 0;
1202                         switch (setup.bRequest) {
1203                         case USB_REQ_SET_ADDRESS:
1204                                 if (setup.bRequestType != Dev_Request)
1205                                         break;
1206                                 dum->address = setup.wValue;
1207                                 maybe_set_status (urb, 0);
1208                                 dev_dbg (dummy_dev(dum), "set_address = %d\n",
1209                                                 setup.wValue);
1210                                 value = 0;
1211                                 break;
1212                         case USB_REQ_SET_FEATURE:
1213                                 if (setup.bRequestType == Dev_Request) {
1214                                         value = 0;
1215                                         switch (setup.wValue) {
1216                                         case USB_DEVICE_REMOTE_WAKEUP:
1217                                                 break;
1218                                         default:
1219                                                 value = -EOPNOTSUPP;
1220                                         }
1221                                         if (value == 0) {
1222                                                 dum->devstatus |=
1223                                                         (1 << setup.wValue);
1224                                                 maybe_set_status (urb, 0);
1225                                         }
1226
1227                                 } else if (setup.bRequestType == Ep_Request) {
1228                                         // endpoint halt
1229                                         ep2 = find_endpoint (dum,
1230                                                         setup.wIndex);
1231                                         if (!ep2) {
1232                                                 value = -EOPNOTSUPP;
1233                                                 break;
1234                                         }
1235                                         ep2->halted = 1;
1236                                         value = 0;
1237                                         maybe_set_status (urb, 0);
1238                                 }
1239                                 break;
1240                         case USB_REQ_CLEAR_FEATURE:
1241                                 if (setup.bRequestType == Dev_Request) {
1242                                         switch (setup.wValue) {
1243                                         case USB_DEVICE_REMOTE_WAKEUP:
1244                                                 dum->devstatus &= ~(1 <<
1245                                                         USB_DEVICE_REMOTE_WAKEUP);
1246                                                 value = 0;
1247                                                 maybe_set_status (urb, 0);
1248                                                 break;
1249                                         default:
1250                                                 value = -EOPNOTSUPP;
1251                                                 break;
1252                                         }
1253                                 } else if (setup.bRequestType == Ep_Request) {
1254                                         // endpoint halt
1255                                         ep2 = find_endpoint (dum,
1256                                                         setup.wIndex);
1257                                         if (!ep2) {
1258                                                 value = -EOPNOTSUPP;
1259                                                 break;
1260                                         }
1261                                         ep2->halted = 0;
1262                                         value = 0;
1263                                         maybe_set_status (urb, 0);
1264                                 }
1265                                 break;
1266                         case USB_REQ_GET_STATUS:
1267                                 if (setup.bRequestType == Dev_InRequest
1268                                                 || setup.bRequestType
1269                                                         == Intf_InRequest
1270                                                 || setup.bRequestType
1271                                                         == Ep_InRequest
1272                                                 ) {
1273                                         char *buf;
1274
1275                                         // device: remote wakeup, selfpowered
1276                                         // interface: nothing
1277                                         // endpoint: halt
1278                                         buf = (char *)urb->transfer_buffer;
1279                                         if (urb->transfer_buffer_length > 0) {
1280                                                 if (setup.bRequestType ==
1281                                                                 Ep_InRequest) {
1282         ep2 = find_endpoint (dum, setup.wIndex);
1283         if (!ep2) {
1284                 value = -EOPNOTSUPP;
1285                 break;
1286         }
1287         buf [0] = ep2->halted;
1288                                                 } else if (setup.bRequestType ==
1289                                                                 Dev_InRequest) {
1290                                                         buf [0] = (u8)
1291                                                                 dum->devstatus;
1292                                                 } else
1293                                                         buf [0] = 0;
1294                                         }
1295                                         if (urb->transfer_buffer_length > 1)
1296                                                 buf [1] = 0;
1297                                         urb->actual_length = min (2,
1298                                                 urb->transfer_buffer_length);
1299                                         value = 0;
1300                                         maybe_set_status (urb, 0);
1301                                 }
1302                                 break;
1303                         }
1304
1305                         /* gadget driver handles all other requests.  block
1306                          * until setup() returns; no reentrancy issues etc.
1307                          */
1308                         if (value > 0) {
1309                                 spin_unlock (&dum->lock);
1310                                 value = dum->driver->setup (&dum->gadget,
1311                                                 &setup);
1312                                 spin_lock (&dum->lock);
1313
1314                                 if (value >= 0) {
1315                                         /* no delays (max 64KB data stage) */
1316                                         limit = 64*1024;
1317                                         goto treat_control_like_bulk;
1318                                 }
1319                                 /* error, see below */
1320                         }
1321
1322                         if (value < 0) {
1323                                 if (value != -EOPNOTSUPP)
1324                                         dev_dbg (dummy_dev(dum),
1325                                                 "setup --> %d\n",
1326                                                 value);
1327                                 maybe_set_status (urb, -EPIPE);
1328                                 urb->actual_length = 0;
1329                         }
1330
1331                         goto return_urb;
1332                 }
1333
1334                 /* non-control requests */
1335                 limit = total;
1336                 switch (usb_pipetype (urb->pipe)) {
1337                 case PIPE_ISOCHRONOUS:
1338                         /* FIXME is it urb->interval since the last xfer?
1339                          * use urb->iso_frame_desc[i].
1340                          * complete whether or not ep has requests queued.
1341                          * report random errors, to debug drivers.
1342                          */
1343                         limit = max (limit, periodic_bytes (dum, ep));
1344                         maybe_set_status (urb, -ENOSYS);
1345                         break;
1346
1347                 case PIPE_INTERRUPT:
1348                         /* FIXME is it urb->interval since the last xfer?
1349                          * this almost certainly polls too fast.
1350                          */
1351                         limit = max (limit, periodic_bytes (dum, ep));
1352                         /* FALLTHROUGH */
1353
1354                 // case PIPE_BULK:  case PIPE_CONTROL:
1355                 default:
1356                 treat_control_like_bulk:
1357                         ep->last_io = jiffies;
1358                         total = transfer (dum, urb, ep, limit);
1359                         break;
1360                 }
1361
1362                 /* incomplete transfer? */
1363                 if (urb->status == -EINPROGRESS)
1364                         continue;
1365
1366 return_urb:
1367                 urb->hcpriv = NULL;
1368                 list_del (&urbp->urbp_list);
1369                 kfree (urbp);
1370                 if (ep)
1371                         ep->already_seen = ep->setup_stage = 0;
1372
1373                 spin_unlock (&dum->lock);
1374                 usb_hcd_giveback_urb (dummy_to_hcd(dum), urb, NULL);
1375                 spin_lock (&dum->lock);
1376
1377                 goto restart;
1378         }
1379
1380         /* want a 1 msec delay here */
1381         if (!list_empty (&dum->urbp_list))
1382                 mod_timer (&dum->timer, jiffies + msecs_to_jiffies(1));
1383         else {
1384                 usb_put_dev (dum->udev);
1385                 dum->udev = NULL;
1386         }
1387
1388         spin_unlock_irqrestore (&dum->lock, flags);
1389 }
1390
1391 /*-------------------------------------------------------------------------*/
1392
1393 #define PORT_C_MASK \
1394          ((1 << USB_PORT_FEAT_C_CONNECTION) \
1395         | (1 << USB_PORT_FEAT_C_ENABLE) \
1396         | (1 << USB_PORT_FEAT_C_SUSPEND) \
1397         | (1 << USB_PORT_FEAT_C_OVER_CURRENT) \
1398         | (1 << USB_PORT_FEAT_C_RESET))
1399
1400 static int dummy_hub_status (struct usb_hcd *hcd, char *buf)
1401 {
1402         struct dummy            *dum;
1403         unsigned long           flags;
1404         int                     retval;
1405
1406         dum = hcd_to_dummy (hcd);
1407
1408         spin_lock_irqsave (&dum->lock, flags);
1409         if (!(dum->port_status & PORT_C_MASK))
1410                 retval = 0;
1411         else {
1412                 *buf = (1 << 1);
1413                 dev_dbg (dummy_dev(dum), "port status 0x%08x has changes\n",
1414                         dum->port_status);
1415                 retval = 1;
1416         }
1417         spin_unlock_irqrestore (&dum->lock, flags);
1418         return retval;
1419 }
1420
1421 static inline void
1422 hub_descriptor (struct usb_hub_descriptor *desc)
1423 {
1424         memset (desc, 0, sizeof *desc);
1425         desc->bDescriptorType = 0x29;
1426         desc->bDescLength = 9;
1427         desc->wHubCharacteristics = __constant_cpu_to_le16 (0x0001);
1428         desc->bNbrPorts = 1;
1429         desc->bitmap [0] = 0xff;
1430         desc->bitmap [1] = 0xff;
1431 }
1432
1433 static int dummy_hub_control (
1434         struct usb_hcd  *hcd,
1435         u16             typeReq,
1436         u16             wValue,
1437         u16             wIndex,
1438         char            *buf,
1439         u16             wLength
1440 ) {
1441         struct dummy    *dum;
1442         int             retval = 0;
1443         unsigned long   flags;
1444
1445         dum = hcd_to_dummy (hcd);
1446         spin_lock_irqsave (&dum->lock, flags);
1447         switch (typeReq) {
1448         case ClearHubFeature:
1449                 break;
1450         case ClearPortFeature:
1451                 switch (wValue) {
1452                 case USB_PORT_FEAT_SUSPEND:
1453                         if (dum->port_status & (1 << USB_PORT_FEAT_SUSPEND)) {
1454                                 /* 20msec resume signaling */
1455                                 dum->resuming = 1;
1456                                 dum->re_timeout = jiffies +
1457                                                         msecs_to_jiffies(20);
1458                         }
1459                         break;
1460                 case USB_PORT_FEAT_POWER:
1461                         dum->port_status = 0;
1462                         dum->resuming = 0;
1463                         stop_activity(dum, dum->driver);
1464                         break;
1465                 default:
1466                         dum->port_status &= ~(1 << wValue);
1467                 }
1468                 break;
1469         case GetHubDescriptor:
1470                 hub_descriptor ((struct usb_hub_descriptor *) buf);
1471                 break;
1472         case GetHubStatus:
1473                 *(u32 *) buf = __constant_cpu_to_le32 (0);
1474                 break;
1475         case GetPortStatus:
1476                 if (wIndex != 1)
1477                         retval = -EPIPE;
1478
1479                 /* whoever resets or resumes must GetPortStatus to
1480                  * complete it!!
1481                  */
1482                 if (dum->resuming && time_after (jiffies, dum->re_timeout)) {
1483                         dum->port_status |= (1 << USB_PORT_FEAT_C_SUSPEND);
1484                         dum->port_status &= ~(1 << USB_PORT_FEAT_SUSPEND);
1485                         dum->resuming = 0;
1486                         dum->re_timeout = 0;
1487                         if (dum->driver && dum->driver->resume) {
1488                                 spin_unlock (&dum->lock);
1489                                 dum->driver->resume (&dum->gadget);
1490                                 spin_lock (&dum->lock);
1491                         }
1492                 }
1493                 if ((dum->port_status & (1 << USB_PORT_FEAT_RESET)) != 0
1494                                 && time_after (jiffies, dum->re_timeout)) {
1495                         dum->port_status |= (1 << USB_PORT_FEAT_C_RESET);
1496                         dum->port_status &= ~(1 << USB_PORT_FEAT_RESET);
1497                         dum->re_timeout = 0;
1498                         if (dum->driver) {
1499                                 dum->port_status |= USB_PORT_STAT_ENABLE;
1500                                 /* give it the best speed we agree on */
1501                                 dum->gadget.speed = dum->driver->speed;
1502                                 dum->gadget.ep0->maxpacket = 64;
1503                                 switch (dum->gadget.speed) {
1504                                 case USB_SPEED_HIGH:
1505                                         dum->port_status |=
1506                                                 USB_PORT_STAT_HIGH_SPEED;
1507                                         break;
1508                                 case USB_SPEED_LOW:
1509                                         dum->gadget.ep0->maxpacket = 8;
1510                                         dum->port_status |=
1511                                                 USB_PORT_STAT_LOW_SPEED;
1512                                         break;
1513                                 default:
1514                                         dum->gadget.speed = USB_SPEED_FULL;
1515                                         break;
1516                                 }
1517                         }
1518                 }
1519                 ((u16 *) buf)[0] = cpu_to_le16 (dum->port_status);
1520                 ((u16 *) buf)[1] = cpu_to_le16 (dum->port_status >> 16);
1521                 break;
1522         case SetHubFeature:
1523                 retval = -EPIPE;
1524                 break;
1525         case SetPortFeature:
1526                 switch (wValue) {
1527                 case USB_PORT_FEAT_SUSPEND:
1528                         if ((dum->port_status & (1 << USB_PORT_FEAT_SUSPEND))
1529                                         == 0) {
1530                                 dum->port_status |=
1531                                                 (1 << USB_PORT_FEAT_SUSPEND);
1532                                 if (dum->driver && dum->driver->suspend) {
1533                                         spin_unlock (&dum->lock);
1534                                         dum->driver->suspend (&dum->gadget);
1535                                         spin_lock (&dum->lock);
1536                                 }
1537                         }
1538                         break;
1539                 case USB_PORT_FEAT_RESET:
1540                         /* if it's already running, disconnect first */
1541                         if (dum->port_status & USB_PORT_STAT_ENABLE) {
1542                                 dum->port_status &= ~(USB_PORT_STAT_ENABLE
1543                                                 | USB_PORT_STAT_LOW_SPEED
1544                                                 | USB_PORT_STAT_HIGH_SPEED);
1545                                 if (dum->driver) {
1546                                         dev_dbg (dummy_dev(dum),
1547                                                         "disconnect\n");
1548                                         stop_activity (dum, dum->driver);
1549                                 }
1550
1551                                 /* FIXME test that code path! */
1552                         }
1553                         /* 50msec reset signaling */
1554                         dum->re_timeout = jiffies + msecs_to_jiffies(50);
1555                         /* FALLTHROUGH */
1556                 default:
1557                         dum->port_status |= (1 << wValue);
1558                 }
1559                 break;
1560
1561         default:
1562                 dev_dbg (dummy_dev(dum),
1563                         "hub control req%04x v%04x i%04x l%d\n",
1564                         typeReq, wValue, wIndex, wLength);
1565
1566                 /* "protocol stall" on error */
1567                 retval = -EPIPE;
1568         }
1569         spin_unlock_irqrestore (&dum->lock, flags);
1570         return retval;
1571 }
1572
1573
1574 /*-------------------------------------------------------------------------*/
1575
1576 static inline ssize_t
1577 show_urb (char *buf, size_t size, struct urb *urb)
1578 {
1579         int ep = usb_pipeendpoint (urb->pipe);
1580
1581         return snprintf (buf, size,
1582                 "urb/%p %s ep%d%s%s len %d/%d\n",
1583                 urb,
1584                 ({ char *s;
1585                  switch (urb->dev->speed) {
1586                  case USB_SPEED_LOW:    s = "ls"; break;
1587                  case USB_SPEED_FULL:   s = "fs"; break;
1588                  case USB_SPEED_HIGH:   s = "hs"; break;
1589                  default:               s = "?"; break;
1590                  }; s; }),
1591                 ep, ep ? (usb_pipein (urb->pipe) ? "in" : "out") : "",
1592                 ({ char *s; \
1593                  switch (usb_pipetype (urb->pipe)) { \
1594                  case PIPE_CONTROL:     s = ""; break; \
1595                  case PIPE_BULK:        s = "-bulk"; break; \
1596                  case PIPE_INTERRUPT:   s = "-int"; break; \
1597                  default:               s = "-iso"; break; \
1598                 }; s;}),
1599                 urb->actual_length, urb->transfer_buffer_length);
1600 }
1601
1602 static ssize_t
1603 show_urbs (struct device *dev, char *buf)
1604 {
1605         struct usb_hcd          *hcd = dev_get_drvdata (dev);
1606         struct dummy            *dum = hcd_to_dummy (hcd);
1607         struct urbp             *urbp;
1608         size_t                  size = 0;
1609         unsigned long           flags;
1610
1611         spin_lock_irqsave (&dum->lock, flags);
1612         list_for_each_entry (urbp, &dum->urbp_list, urbp_list) {
1613                 size_t          temp;
1614
1615                 temp = show_urb (buf, PAGE_SIZE - size, urbp->urb);
1616                 buf += temp;
1617                 size += temp;
1618         }
1619         spin_unlock_irqrestore (&dum->lock, flags);
1620
1621         return size;
1622 }
1623 static DEVICE_ATTR (urbs, S_IRUGO, show_urbs, NULL);
1624
1625 static int dummy_start (struct usb_hcd *hcd)
1626 {
1627         struct dummy            *dum;
1628         struct usb_device       *root;
1629         int                     retval;
1630
1631         dum = hcd_to_dummy (hcd);
1632
1633         /*
1634          * MASTER side init ... we emulate a root hub that'll only ever
1635          * talk to one device (the slave side).  Also appears in sysfs,
1636          * just like more familiar pci-based HCDs.
1637          */
1638         spin_lock_init (&dum->lock);
1639         init_timer (&dum->timer);
1640         dum->timer.function = dummy_timer;
1641         dum->timer.data = (unsigned long) dum;
1642
1643         INIT_LIST_HEAD (&dum->urbp_list);
1644
1645         root = usb_alloc_dev (NULL, &hcd->self, 0);
1646         if (!root)
1647                 return -ENOMEM;
1648
1649         /* root hub enters addressed state... */
1650         hcd->state = HC_STATE_RUNNING;
1651         root->speed = USB_SPEED_HIGH;
1652
1653         /* ...then configured, so khubd sees us. */
1654         if ((retval = usb_hcd_register_root_hub (root, hcd)) != 0) {
1655                 goto err1;
1656         }
1657
1658         /* only show a low-power port: just 8mA */
1659         hub_set_power_budget (root, 8);
1660
1661         if ((retval = dummy_register_udc (dum)) != 0)
1662                 goto err2;
1663
1664         /* FIXME 'urbs' should be a per-device thing, maybe in usbcore */
1665         device_create_file (dummy_dev(dum), &dev_attr_urbs);
1666         return 0;
1667
1668  err2:
1669         usb_disconnect (&hcd->self.root_hub);
1670  err1:
1671         usb_put_dev (root);
1672         hcd->state = HC_STATE_QUIESCING;
1673         return retval;
1674 }
1675
1676 static void dummy_stop (struct usb_hcd *hcd)
1677 {
1678         struct dummy            *dum;
1679
1680         dum = hcd_to_dummy (hcd);
1681
1682         device_remove_file (dummy_dev(dum), &dev_attr_urbs);
1683
1684         usb_gadget_unregister_driver (dum->driver);
1685         dummy_unregister_udc (dum);
1686
1687         dev_info (dummy_dev(dum), "stopped\n");
1688 }
1689
1690 /*-------------------------------------------------------------------------*/
1691
1692 static int dummy_h_get_frame (struct usb_hcd *hcd)
1693 {
1694         return dummy_g_get_frame (NULL);
1695 }
1696
1697 static const struct hc_driver dummy_hcd = {
1698         .description =          (char *) driver_name,
1699         .product_desc =         "Dummy host controller",
1700         .hcd_priv_size =        sizeof(struct dummy),
1701
1702         .flags =                HCD_USB2,
1703
1704         .start =                dummy_start,
1705         .stop =                 dummy_stop,
1706
1707         .urb_enqueue =          dummy_urb_enqueue,
1708         .urb_dequeue =          dummy_urb_dequeue,
1709
1710         .get_frame_number =     dummy_h_get_frame,
1711
1712         .hub_status_data =      dummy_hub_status,
1713         .hub_control =          dummy_hub_control,
1714 };
1715
1716 static int dummy_probe (struct device *dev)
1717 {
1718         struct usb_hcd          *hcd;
1719         int                     retval;
1720
1721         dev_info (dev, "%s, driver " DRIVER_VERSION "\n", driver_desc);
1722
1723         hcd = usb_create_hcd (&dummy_hcd, dev, dev->bus_id);
1724         if (!hcd)
1725                 return -ENOMEM;
1726         the_controller = hcd_to_dummy (hcd);
1727
1728         retval = usb_add_hcd(hcd, 0, 0);
1729         if (retval != 0) {
1730                 usb_put_hcd (hcd);
1731                 the_controller = NULL;
1732         }
1733         return retval;
1734 }
1735
1736 static void dummy_remove (struct device *dev)
1737 {
1738         struct usb_hcd          *hcd;
1739
1740         hcd = dev_get_drvdata (dev);
1741         usb_remove_hcd (hcd);
1742         usb_put_hcd (hcd);
1743         the_controller = NULL;
1744 }
1745
1746 /*-------------------------------------------------------------------------*/
1747
1748 static int dummy_pdev_detect (void)
1749 {
1750         int                     retval;
1751
1752         retval = driver_register (&dummy_driver);
1753         if (retval < 0)
1754                 return retval;
1755
1756         the_pdev.name = "hc";
1757         the_pdev.dev.driver = &dummy_driver;
1758         the_pdev.dev.release = dummy_pdev_release;
1759
1760         retval = platform_device_register (&the_pdev);
1761         if (retval < 0)
1762                 driver_unregister (&dummy_driver);
1763         return retval;
1764 }
1765
1766 static void dummy_pdev_remove (void)
1767 {
1768         platform_device_unregister (&the_pdev);
1769         driver_unregister (&dummy_driver);
1770 }
1771
1772 /*-------------------------------------------------------------------------*/
1773
1774 static int __init init (void)
1775 {
1776         int     retval;
1777
1778         if (usb_disabled ())
1779                 return -ENODEV;
1780         if ((retval = dummy_pdev_detect ()) != 0)
1781                 return retval;
1782         if ((retval = dummy_probe (&the_pdev.dev)) != 0)
1783                 dummy_pdev_remove ();
1784         return retval;
1785 }
1786 module_init (init);
1787
1788 static void __exit cleanup (void)
1789 {
1790         dummy_remove (&the_pdev.dev);
1791         dummy_pdev_remove ();
1792 }
1793 module_exit (cleanup);