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
  15
  16 /*
  17  * This exposes a device side "USB gadget" API, driven by requests to a
  18  * Linux-USB host controller driver.  USB traffic is simulated; there's
  19  * no need for USB hardware.  Use this with two other drivers:
  20  *
  21  *  - Gadget driver, responding to requests (slave);
  22  *  - Host-side device driver, as already familiar in Linux.
  23  *
  24  * Having this all in one kernel can help some stages of development,
  25  * bypassing some hardware (and driver) issues.  UML could help too.
  26  */
  27
  28 #include <linux/module.h>
  29 #include <linux/kernel.h>
  30 #include <linux/delay.h>
  31 #include <linux/ioport.h>
  32 #include <linux/slab.h>
  33 #include <linux/errno.h>
  34 #include <linux/init.h>
  35 #include <linux/timer.h>
  36 #include <linux/list.h>
  37 #include <linux/interrupt.h>
  38 #include <linux/platform_device.h>
  39 #include <linux/usb.h>
  40 #include <linux/usb/gadget.h>
  41 #include <linux/usb/hcd.h>
  42
  43 #include <asm/byteorder.h>
  44 #include <asm/io.h>
  45 #include <asm/irq.h>
  46 #include <asm/system.h>
  47 #include <asm/unaligned.h>
  48
  49
  50 #define DRIVER_DESC     "USB Host+Gadget Emulator"
  51 #define DRIVER_VERSION  "02 May 2005"
  52
  53 #define POWER_BUDGET    500     /* in mA; use 8 for low-power port testing */
  54
  55 static const char       driver_name [] = "dummy_hcd";
  56 static const char       driver_desc [] = "USB Host+Gadget Emulator";
  57
  58 static const char       gadget_name [] = "dummy_udc";
  59
  60 MODULE_DESCRIPTION (DRIVER_DESC);
  61 MODULE_AUTHOR ("David Brownell");
  62 MODULE_LICENSE ("GPL");
  63
  64 struct dummy_hcd_module_parameters {
  65         bool is_super_speed;
  66         bool is_high_speed;
  67 };
  68
  69 static struct dummy_hcd_module_parameters mod_data = {
  70         .is_super_speed = false,
  71         .is_high_speed = true,
  72 };
  73 module_param_named(is_super_speed, mod_data.is_super_speed, bool, S_IRUGO);
  74 MODULE_PARM_DESC(is_super_speed, "true to simulate SuperSpeed connection");
  75 module_param_named(is_high_speed, mod_data.is_high_speed, bool, S_IRUGO);
  76 MODULE_PARM_DESC(is_high_speed, "true to simulate HighSpeed connection");
  77 /*-------------------------------------------------------------------------*/
  78
  79 /* gadget side driver data structres */
  80 struct dummy_ep {
  81         struct list_head                queue;
  82         unsigned long                   last_io;        /* jiffies timestamp */
  83         struct usb_gadget               *gadget;
  84         const struct usb_endpoint_descriptor *desc;
  85         struct usb_ep                   ep;
  86         unsigned                        halted : 1;
  87         unsigned                        wedged : 1;
  88         unsigned                        already_seen : 1;
  89         unsigned                        setup_stage : 1;
  90 };
  91
  92 struct dummy_request {
  93         struct list_head                queue;          /* ep's requests */
  94         struct usb_request              req;
  95 };
  96
  97 static inline struct dummy_ep *usb_ep_to_dummy_ep (struct usb_ep *_ep)
  98 {
  99         return container_of (_ep, struct dummy_ep, ep);
 100 }
 101
 102 static inline struct dummy_request *usb_request_to_dummy_request
 103                 (struct usb_request *_req)
 104 {
 105         return container_of (_req, struct dummy_request, req);
 106 }
 107
 108 /*-------------------------------------------------------------------------*/
 109
 110 /*
 111  * Every device has ep0 for control requests, plus up to 30 more endpoints,
 112  * in one of two types:
 113  *
 114  *   - Configurable:  direction (in/out), type (bulk, iso, etc), and endpoint
 115  *     number can be changed.  Names like "ep-a" are used for this type.
 116  *
 117  *   - Fixed Function:  in other cases.  some characteristics may be mutable;
 118  *     that'd be hardware-specific.  Names like "ep12out-bulk" are used.
 119  *
 120  * Gadget drivers are responsible for not setting up conflicting endpoint
 121  * configurations, illegal or unsupported packet lengths, and so on.
 122  */
 123
 124 static const char ep0name [] = "ep0";
 125
 126 static const char *const ep_name [] = {
 127         ep0name,                                /* everyone has ep0 */
 128
 129         /* act like a pxa250: fifteen fixed function endpoints */
 130         "ep1in-bulk", "ep2out-bulk", "ep3in-iso", "ep4out-iso", "ep5in-int",
 131         "ep6in-bulk", "ep7out-bulk", "ep8in-iso", "ep9out-iso", "ep10in-int",
 132         "ep11in-bulk", "ep12out-bulk", "ep13in-iso", "ep14out-iso",
 133                 "ep15in-int",
 134
 135         /* or like sa1100: two fixed function endpoints */
 136         "ep1out-bulk", "ep2in-bulk",
 137
 138         /* and now some generic EPs so we have enough in multi config */
 139         "ep3out", "ep4in", "ep5out", "ep6out", "ep7in", "ep8out", "ep9in",
 140         "ep10out", "ep11out", "ep12in", "ep13out", "ep14in", "ep15out",
 141 };
 142 #define DUMMY_ENDPOINTS ARRAY_SIZE(ep_name)
 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_hcd {
 161         struct dummy                    *dum;
 162         enum dummy_rh_state             rh_state;
 163         struct timer_list               timer;
 164         u32                             port_status;
 165         u32                             old_status;
 166         unsigned long                   re_timeout;
 167
 168         struct usb_device               *udev;
 169         struct list_head                urbp_list;
 170
 171         unsigned                        active:1;
 172         unsigned                        old_active:1;
 173         unsigned                        resuming:1;
 174 };
 175
 176 struct dummy {
 177         spinlock_t                      lock;
 178
 179         /*
 180          * SLAVE/GADGET side support
 181          */
 182         struct dummy_ep                 ep [DUMMY_ENDPOINTS];
 183         int                             address;
 184         struct usb_gadget               gadget;
 185         struct usb_gadget_driver        *driver;
 186         struct dummy_request            fifo_req;
 187         u8                              fifo_buf [FIFO_SIZE];
 188         u16                             devstatus;
 189         unsigned                        udc_suspended:1;
 190         unsigned                        pullup:1;
 191
 192         /*
 193          * MASTER/HOST side support
 194          */
 195         struct dummy_hcd                *hs_hcd;
 196         struct dummy_hcd                *ss_hcd;
 197 };
 198
 199 static inline struct dummy_hcd *hcd_to_dummy_hcd(struct usb_hcd *hcd)
 200 {
 201         return (struct dummy_hcd *) (hcd->hcd_priv);
 202 }
 203
 204 static inline struct usb_hcd *dummy_hcd_to_hcd(struct dummy_hcd *dum)
 205 {
 206         return container_of((void *) dum, struct usb_hcd, hcd_priv);
 207 }
 208
 209 static inline struct device *dummy_dev(struct dummy_hcd *dum)
 210 {
 211         return dummy_hcd_to_hcd(dum)->self.controller;
 212 }
 213
 214 static inline struct device *udc_dev (struct dummy *dum)
 215 {
 216         return dum->gadget.dev.parent;
 217 }
 218
 219 static inline struct dummy *ep_to_dummy (struct dummy_ep *ep)
 220 {
 221         return container_of (ep->gadget, struct dummy, gadget);
 222 }
 223
 224 static inline struct dummy_hcd *gadget_to_dummy_hcd(struct usb_gadget *gadget)
 225 {
 226         struct dummy *dum = container_of(gadget, struct dummy, gadget);
 227         if (dum->gadget.speed == USB_SPEED_SUPER)
 228                 return dum->ss_hcd;
 229         else
 230                 return dum->hs_hcd;
 231 }
 232
 233 static inline struct dummy *gadget_dev_to_dummy (struct device *dev)
 234 {
 235         return container_of (dev, struct dummy, gadget.dev);
 236 }
 237
 238 static struct dummy                     the_controller;
 239
 240 /*-------------------------------------------------------------------------*/
 241
 242 /* SLAVE/GADGET SIDE UTILITY ROUTINES */
 243
 244 /* called with spinlock held */
 245 static void nuke (struct dummy *dum, struct dummy_ep *ep)
 246 {
 247         while (!list_empty (&ep->queue)) {
 248                 struct dummy_request    *req;
 249
 250                 req = list_entry (ep->queue.next, struct dummy_request, queue);
 251                 list_del_init (&req->queue);
 252                 req->req.status = -ESHUTDOWN;
 253
 254                 spin_unlock (&dum->lock);
 255                 req->req.complete (&ep->ep, &req->req);
 256                 spin_lock (&dum->lock);
 257         }
 258 }
 259
 260 /* caller must hold lock */
 261 static void
 262 stop_activity (struct dummy *dum)
 263 {
 264         struct dummy_ep *ep;
 265
 266         /* prevent any more requests */
 267         dum->address = 0;
 268
 269         /* The timer is left running so that outstanding URBs can fail */
 270
 271         /* nuke any pending requests first, so driver i/o is quiesced */
 272         list_for_each_entry (ep, &dum->gadget.ep_list, ep.ep_list)
 273                 nuke (dum, ep);
 274
 275         /* driver now does any non-usb quiescing necessary */
 276 }
 277
 278 /**
 279  * set_link_state_by_speed() - Sets the current state of the link according to
 280  *      the hcd speed
 281  * @dum_hcd: pointer to the dummy_hcd structure to update the link state for
 282  *
 283  * This function updates the port_status according to the link state and the
 284  * speed of the hcd.
 285  */
 286 static void set_link_state_by_speed(struct dummy_hcd *dum_hcd)
 287 {
 288         struct dummy *dum = dum_hcd->dum;
 289
 290         if (dummy_hcd_to_hcd(dum_hcd)->speed == HCD_USB3) {
 291                 if ((dum_hcd->port_status & USB_SS_PORT_STAT_POWER) == 0) {
 292                         dum_hcd->port_status = 0;
 293                 } else if (!dum->pullup || dum->udc_suspended) {
 294                         /* UDC suspend must cause a disconnect */
 295                         dum_hcd->port_status &= ~(USB_PORT_STAT_CONNECTION |
 296                                                 USB_PORT_STAT_ENABLE);
 297                         if ((dum_hcd->old_status &
 298                              USB_PORT_STAT_CONNECTION) != 0)
 299                                 dum_hcd->port_status |=
 300                                         (USB_PORT_STAT_C_CONNECTION << 16);
 301                 } else {
 302                         /* device is connected and not suspended */
 303                         dum_hcd->port_status |= (USB_PORT_STAT_CONNECTION |
 304                                                  USB_PORT_STAT_SPEED_5GBPS) ;
 305                         if ((dum_hcd->old_status &
 306                              USB_PORT_STAT_CONNECTION) == 0)
 307                                 dum_hcd->port_status |=
 308                                         (USB_PORT_STAT_C_CONNECTION << 16);
 309                         if ((dum_hcd->port_status &
 310                              USB_PORT_STAT_ENABLE) == 1 &&
 311                                 (dum_hcd->port_status &
 312                                  USB_SS_PORT_LS_U0) == 1 &&
 313                                 dum_hcd->rh_state != DUMMY_RH_SUSPENDED)
 314                                 dum_hcd->active = 1;
 315                 }
 316         } else {
 317                 if ((dum_hcd->port_status & USB_PORT_STAT_POWER) == 0) {
 318                         dum_hcd->port_status = 0;
 319                 } else if (!dum->pullup || dum->udc_suspended) {
 320                         /* UDC suspend must cause a disconnect */
 321                         dum_hcd->port_status &= ~(USB_PORT_STAT_CONNECTION |
 322                                                 USB_PORT_STAT_ENABLE |
 323                                                 USB_PORT_STAT_LOW_SPEED |
 324                                                 USB_PORT_STAT_HIGH_SPEED |
 325                                                 USB_PORT_STAT_SUSPEND);
 326                         if ((dum_hcd->old_status &
 327                              USB_PORT_STAT_CONNECTION) != 0)
 328                                 dum_hcd->port_status |=
 329                                         (USB_PORT_STAT_C_CONNECTION << 16);
 330                 } else {
 331                         dum_hcd->port_status |= USB_PORT_STAT_CONNECTION;
 332                         if ((dum_hcd->old_status &
 333                              USB_PORT_STAT_CONNECTION) == 0)
 334                                 dum_hcd->port_status |=
 335                                         (USB_PORT_STAT_C_CONNECTION << 16);
 336                         if ((dum_hcd->port_status & USB_PORT_STAT_ENABLE) == 0)
 337                                 dum_hcd->port_status &= ~USB_PORT_STAT_SUSPEND;
 338                         else if ((dum_hcd->port_status &
 339                                   USB_PORT_STAT_SUSPEND) == 0 &&
 340                                         dum_hcd->rh_state != DUMMY_RH_SUSPENDED)
 341                                 dum_hcd->active = 1;
 342                 }
 343         }
 344 }
 345
 346 /* caller must hold lock */
 347 static void set_link_state(struct dummy_hcd *dum_hcd)
 348 {
 349         struct dummy *dum = dum_hcd->dum;
 350
 351         dum_hcd->active = 0;
 352         if (dum->pullup)
 353                 if ((dummy_hcd_to_hcd(dum_hcd)->speed == HCD_USB3 &&
 354                      dum->gadget.speed != USB_SPEED_SUPER) ||
 355                     (dummy_hcd_to_hcd(dum_hcd)->speed != HCD_USB3 &&
 356                      dum->gadget.speed == USB_SPEED_SUPER))
 357                         return;
 358
 359         set_link_state_by_speed(dum_hcd);
 360
 361         if ((dum_hcd->port_status & USB_PORT_STAT_ENABLE) == 0 ||
 362              dum_hcd->active)
 363                 dum_hcd->resuming = 0;
 364
 365         /* if !connected or reset */
 366         if ((dum_hcd->port_status & USB_PORT_STAT_CONNECTION) == 0 ||
 367                         (dum_hcd->port_status & USB_PORT_STAT_RESET) != 0) {
 368                 /*
 369                  * We're connected and not reset (reset occurred now),
 370                  * and driver attached - disconnect!
 371                  */
 372                 if ((dum_hcd->old_status & USB_PORT_STAT_CONNECTION) != 0 &&
 373                     (dum_hcd->old_status & USB_PORT_STAT_RESET) == 0 &&
 374                     dum->driver) {
 375                         stop_activity(dum);
 376                         spin_unlock(&dum->lock);
 377                         dum->driver->disconnect(&dum->gadget);
 378                         spin_lock(&dum->lock);
 379                 }
 380         } else if (dum_hcd->active != dum_hcd->old_active) {
 381                 if (dum_hcd->old_active && dum->driver->suspend) {
 382                         spin_unlock(&dum->lock);
 383                         dum->driver->suspend(&dum->gadget);
 384                         spin_lock(&dum->lock);
 385                 } else if (!dum_hcd->old_active &&  dum->driver->resume) {
 386                         spin_unlock(&dum->lock);
 387                         dum->driver->resume(&dum->gadget);
 388                         spin_lock(&dum->lock);
 389                 }
 390         }
 391
 392         dum_hcd->old_status = dum_hcd->port_status;
 393         dum_hcd->old_active = dum_hcd->active;
 394 }
 395
 396 /*-------------------------------------------------------------------------*/
 397
 398 /* SLAVE/GADGET SIDE DRIVER
 399  *
 400  * This only tracks gadget state.  All the work is done when the host
 401  * side tries some (emulated) i/o operation.  Real device controller
 402  * drivers would do real i/o using dma, fifos, irqs, timers, etc.
 403  */
 404
 405 #define is_enabled(dum) \
 406         (dum->port_status & USB_PORT_STAT_ENABLE)
 407
 408 static int
 409 dummy_enable (struct usb_ep *_ep, const struct usb_endpoint_descriptor *desc)
 410 {
 411         struct dummy            *dum;
 412         struct dummy_hcd        *dum_hcd;
 413         struct dummy_ep         *ep;
 414         unsigned                max;
 415         int                     retval;
 416
 417         ep = usb_ep_to_dummy_ep (_ep);
 418         if (!_ep || !desc || ep->desc || _ep->name == ep0name
 419                         || desc->bDescriptorType != USB_DT_ENDPOINT)
 420                 return -EINVAL;
 421         dum = ep_to_dummy (ep);
 422         if (!dum->driver)
 423                 return -ESHUTDOWN;
 424
 425         dum_hcd = gadget_to_dummy_hcd(&dum->gadget);
 426         if (!is_enabled(dum_hcd))
 427                 return -ESHUTDOWN;
 428
 429         /*
 430          * For HS/FS devices only bits 0..10 of the wMaxPacketSize represent the
 431          * maximum packet size.
 432          * For SS devices the wMaxPacketSize is limited by 1024.
 433          */
 434         max = usb_endpoint_maxp(desc) & 0x7ff;
 435
 436         /* drivers must not request bad settings, since lower levels
 437          * (hardware or its drivers) may not check.  some endpoints
 438          * can't do iso, many have maxpacket limitations, etc.
 439          *
 440          * since this "hardware" driver is here to help debugging, we
 441          * have some extra sanity checks.  (there could be more though,
 442          * especially for "ep9out" style fixed function ones.)
 443          */
 444         retval = -EINVAL;
 445         switch (desc->bmAttributes & 0x03) {
 446         case USB_ENDPOINT_XFER_BULK:
 447                 if (strstr (ep->ep.name, "-iso")
 448                                 || strstr (ep->ep.name, "-int")) {
 449                         goto done;
 450                 }
 451                 switch (dum->gadget.speed) {
 452                 case USB_SPEED_SUPER:
 453                         if (max == 1024)
 454                                 break;
 455                         goto done;
 456                 case USB_SPEED_HIGH:
 457                         if (max == 512)
 458                                 break;
 459                         goto done;
 460                 case USB_SPEED_FULL:
 461                         if (max == 8 || max == 16 || max == 32 || max == 64)
 462                                 /* we'll fake any legal size */
 463                                 break;
 464                         /* save a return statement */
 465                 default:
 466                         goto done;
 467                 }
 468                 break;
 469         case USB_ENDPOINT_XFER_INT:
 470                 if (strstr (ep->ep.name, "-iso")) /* bulk is ok */
 471                         goto done;
 472                 /* real hardware might not handle all packet sizes */
 473                 switch (dum->gadget.speed) {
 474                 case USB_SPEED_SUPER:
 475                 case USB_SPEED_HIGH:
 476                         if (max <= 1024)
 477                                 break;
 478                         /* save a return statement */
 479                 case USB_SPEED_FULL:
 480                         if (max <= 64)
 481                                 break;
 482                         /* save a return statement */
 483                 default:
 484                         if (max <= 8)
 485                                 break;
 486                         goto done;
 487                 }
 488                 break;
 489         case USB_ENDPOINT_XFER_ISOC:
 490                 if (strstr (ep->ep.name, "-bulk")
 491                                 || strstr (ep->ep.name, "-int"))
 492                         goto done;
 493                 /* real hardware might not handle all packet sizes */
 494                 switch (dum->gadget.speed) {
 495                 case USB_SPEED_SUPER:
 496                 case USB_SPEED_HIGH:
 497                         if (max <= 1024)
 498                                 break;
 499                         /* save a return statement */
 500                 case USB_SPEED_FULL:
 501                         if (max <= 1023)
 502                                 break;
 503                         /* save a return statement */
 504                 default:
 505                         goto done;
 506                 }
 507                 break;
 508         default:
 509                 /* few chips support control except on ep0 */
 510                 goto done;
 511         }
 512
 513         _ep->maxpacket = max;
 514         ep->desc = desc;
 515
 516         dev_dbg (udc_dev(dum), "enabled %s (ep%d%s-%s) maxpacket %d\n",
 517                 _ep->name,
 518                 desc->bEndpointAddress & 0x0f,
 519                 (desc->bEndpointAddress & USB_DIR_IN) ? "in" : "out",
 520                 ({ char *val;
 521                  switch (desc->bmAttributes & 0x03) {
 522                  case USB_ENDPOINT_XFER_BULK:
 523                          val = "bulk";
 524                          break;
 525                  case USB_ENDPOINT_XFER_ISOC:
 526                          val = "iso";
 527                          break;
 528                  case USB_ENDPOINT_XFER_INT:
 529                          val = "intr";
 530                          break;
 531                  default:
 532                          val = "ctrl";
 533                          break;
 534                  }; val; }),
 535                 max);
 536
 537         /* at this point real hardware should be NAKing transfers
 538          * to that endpoint, until a buffer is queued to it.
 539          */
 540         ep->halted = ep->wedged = 0;
 541         retval = 0;
 542 done:
 543         return retval;
 544 }
 545
 546 static int dummy_disable (struct usb_ep *_ep)
 547 {
 548         struct dummy_ep         *ep;
 549         struct dummy            *dum;
 550         unsigned long           flags;
 551         int                     retval;
 552
 553         ep = usb_ep_to_dummy_ep (_ep);
 554         if (!_ep || !ep->desc || _ep->name == ep0name)
 555                 return -EINVAL;
 556         dum = ep_to_dummy (ep);
 557
 558         spin_lock_irqsave (&dum->lock, flags);
 559         ep->desc = NULL;
 560         retval = 0;
 561         nuke (dum, ep);
 562         spin_unlock_irqrestore (&dum->lock, flags);
 563
 564         dev_dbg (udc_dev(dum), "disabled %s\n", _ep->name);
 565         return retval;
 566 }
 567
 568 static struct usb_request *
 569 dummy_alloc_request (struct usb_ep *_ep, gfp_t mem_flags)
 570 {
 571         struct dummy_ep         *ep;
 572         struct dummy_request    *req;
 573
 574         if (!_ep)
 575                 return NULL;
 576         ep = usb_ep_to_dummy_ep (_ep);
 577
 578         req = kzalloc(sizeof(*req), mem_flags);
 579         if (!req)
 580                 return NULL;
 581         INIT_LIST_HEAD (&req->queue);
 582         return &req->req;
 583 }
 584
 585 static void
 586 dummy_free_request (struct usb_ep *_ep, struct usb_request *_req)
 587 {
 588         struct dummy_ep         *ep;
 589         struct dummy_request    *req;
 590
 591         ep = usb_ep_to_dummy_ep (_ep);
 592         if (!ep || !_req || (!ep->desc && _ep->name != ep0name))
 593                 return;
 594
 595         req = usb_request_to_dummy_request (_req);
 596         WARN_ON (!list_empty (&req->queue));
 597         kfree (req);
 598 }
 599
 600 static void
 601 fifo_complete (struct usb_ep *ep, struct usb_request *req)
 602 {
 603 }
 604
 605 static int
 606 dummy_queue (struct usb_ep *_ep, struct usb_request *_req,
 607                 gfp_t mem_flags)
 608 {
 609         struct dummy_ep         *ep;
 610         struct dummy_request    *req;
 611         struct dummy            *dum;
 612         struct dummy_hcd        *dum_hcd;
 613         unsigned long           flags;
 614
 615         req = usb_request_to_dummy_request (_req);
 616         if (!_req || !list_empty (&req->queue) || !_req->complete)
 617                 return -EINVAL;
 618
 619         ep = usb_ep_to_dummy_ep (_ep);
 620         if (!_ep || (!ep->desc && _ep->name != ep0name))
 621                 return -EINVAL;
 622
 623         dum = ep_to_dummy (ep);
 624         dum_hcd = gadget_to_dummy_hcd(&dum->gadget);
 625         if (!dum->driver || !is_enabled(dum_hcd))
 626                 return -ESHUTDOWN;
 627
 628 #if 0
 629         dev_dbg (udc_dev(dum), "ep %p queue req %p to %s, len %d buf %p\n",
 630                         ep, _req, _ep->name, _req->length, _req->buf);
 631 #endif
 632
 633         _req->status = -EINPROGRESS;
 634         _req->actual = 0;
 635         spin_lock_irqsave (&dum->lock, flags);
 636
 637         /* implement an emulated single-request FIFO */
 638         if (ep->desc && (ep->desc->bEndpointAddress & USB_DIR_IN) &&
 639                         list_empty (&dum->fifo_req.queue) &&
 640                         list_empty (&ep->queue) &&
 641                         _req->length <= FIFO_SIZE) {
 642                 req = &dum->fifo_req;
 643                 req->req = *_req;
 644                 req->req.buf = dum->fifo_buf;
 645                 memcpy (dum->fifo_buf, _req->buf, _req->length);
 646                 req->req.context = dum;
 647                 req->req.complete = fifo_complete;
 648
 649                 list_add_tail(&req->queue, &ep->queue);
 650                 spin_unlock (&dum->lock);
 651                 _req->actual = _req->length;
 652                 _req->status = 0;
 653                 _req->complete (_ep, _req);
 654                 spin_lock (&dum->lock);
 655         }  else
 656                 list_add_tail(&req->queue, &ep->queue);
 657         spin_unlock_irqrestore (&dum->lock, flags);
 658
 659         /* real hardware would likely enable transfers here, in case
 660          * it'd been left NAKing.
 661          */
 662         return 0;
 663 }
 664
 665 static int dummy_dequeue (struct usb_ep *_ep, struct usb_request *_req)
 666 {
 667         struct dummy_ep         *ep;
 668         struct dummy            *dum;
 669         int                     retval = -EINVAL;
 670         unsigned long           flags;
 671         struct dummy_request    *req = NULL;
 672
 673         if (!_ep || !_req)
 674                 return retval;
 675         ep = usb_ep_to_dummy_ep (_ep);
 676         dum = ep_to_dummy (ep);
 677
 678         if (!dum->driver)
 679                 return -ESHUTDOWN;
 680
 681         local_irq_save (flags);
 682         spin_lock (&dum->lock);
 683         list_for_each_entry (req, &ep->queue, queue) {
 684                 if (&req->req == _req) {
 685                         list_del_init (&req->queue);
 686                         _req->status = -ECONNRESET;
 687                         retval = 0;
 688                         break;
 689                 }
 690         }
 691         spin_unlock (&dum->lock);
 692
 693         if (retval == 0) {
 694                 dev_dbg (udc_dev(dum),
 695                                 "dequeued req %p from %s, len %d buf %p\n",
 696                                 req, _ep->name, _req->length, _req->buf);
 697                 _req->complete (_ep, _req);
 698         }
 699         local_irq_restore (flags);
 700         return retval;
 701 }
 702
 703 static int
 704 dummy_set_halt_and_wedge(struct usb_ep *_ep, int value, int wedged)
 705 {
 706         struct dummy_ep         *ep;
 707         struct dummy            *dum;
 708
 709         if (!_ep)
 710                 return -EINVAL;
 711         ep = usb_ep_to_dummy_ep (_ep);
 712         dum = ep_to_dummy (ep);
 713         if (!dum->driver)
 714                 return -ESHUTDOWN;
 715         if (!value)
 716                 ep->halted = ep->wedged = 0;
 717         else if (ep->desc && (ep->desc->bEndpointAddress & USB_DIR_IN) &&
 718                         !list_empty (&ep->queue))
 719                 return -EAGAIN;
 720         else {
 721                 ep->halted = 1;
 722                 if (wedged)
 723                         ep->wedged = 1;
 724         }
 725         /* FIXME clear emulated data toggle too */
 726         return 0;
 727 }
 728
 729 static int
 730 dummy_set_halt(struct usb_ep *_ep, int value)
 731 {
 732         return dummy_set_halt_and_wedge(_ep, value, 0);
 733 }
 734
 735 static int dummy_set_wedge(struct usb_ep *_ep)
 736 {
 737         if (!_ep || _ep->name == ep0name)
 738                 return -EINVAL;
 739         return dummy_set_halt_and_wedge(_ep, 1, 1);
 740 }
 741
 742 static const struct usb_ep_ops dummy_ep_ops = {
 743         .enable         = dummy_enable,
 744         .disable        = dummy_disable,
 745
 746         .alloc_request  = dummy_alloc_request,
 747         .free_request   = dummy_free_request,
 748
 749         .queue          = dummy_queue,
 750         .dequeue        = dummy_dequeue,
 751
 752         .set_halt       = dummy_set_halt,
 753         .set_wedge      = dummy_set_wedge,
 754 };
 755
 756 /*-------------------------------------------------------------------------*/
 757
 758 /* there are both host and device side versions of this call ... */
 759 static int dummy_g_get_frame (struct usb_gadget *_gadget)
 760 {
 761         struct timeval  tv;
 762
 763         do_gettimeofday (&tv);
 764         return tv.tv_usec / 1000;
 765 }
 766
 767 static int dummy_wakeup (struct usb_gadget *_gadget)
 768 {
 769         struct dummy_hcd *dum_hcd;
 770
 771         dum_hcd = gadget_to_dummy_hcd(_gadget);
 772         if (!(dum_hcd->dum->devstatus & ((1 << USB_DEVICE_B_HNP_ENABLE)
 773                                 | (1 << USB_DEVICE_REMOTE_WAKEUP))))
 774                 return -EINVAL;
 775         if ((dum_hcd->port_status & USB_PORT_STAT_CONNECTION) == 0)
 776                 return -ENOLINK;
 777         if ((dum_hcd->port_status & USB_PORT_STAT_SUSPEND) == 0 &&
 778                          dum_hcd->rh_state != DUMMY_RH_SUSPENDED)
 779                 return -EIO;
 780
 781         /* FIXME: What if the root hub is suspended but the port isn't? */
 782
 783         /* hub notices our request, issues downstream resume, etc */
 784         dum_hcd->resuming = 1;
 785         dum_hcd->re_timeout = jiffies + msecs_to_jiffies(20);
 786         mod_timer(&dummy_hcd_to_hcd(dum_hcd)->rh_timer, dum_hcd->re_timeout);
 787         return 0;
 788 }
 789
 790 static int dummy_set_selfpowered (struct usb_gadget *_gadget, int value)
 791 {
 792         struct dummy    *dum;
 793
 794         dum = (gadget_to_dummy_hcd(_gadget))->dum;
 795         if (value)
 796                 dum->devstatus |= (1 << USB_DEVICE_SELF_POWERED);
 797         else
 798                 dum->devstatus &= ~(1 << USB_DEVICE_SELF_POWERED);
 799         return 0;
 800 }
 801
 802 static void dummy_udc_udpate_ep0(struct dummy *dum)
 803 {
 804         u32 i;
 805
 806         if (dum->gadget.speed == USB_SPEED_SUPER) {
 807                 for (i = 0; i < DUMMY_ENDPOINTS; i++)
 808                         dum->ep[i].ep.max_streams = 0x10;
 809                 dum->ep[0].ep.maxpacket = 9;
 810         } else {
 811                 for (i = 0; i < DUMMY_ENDPOINTS; i++)
 812                         dum->ep[i].ep.max_streams = 0;
 813                 dum->ep[0].ep.maxpacket = 64;
 814         }
 815 }
 816
 817 static int dummy_pullup (struct usb_gadget *_gadget, int value)
 818 {
 819         struct dummy_hcd *dum_hcd;
 820         struct dummy    *dum;
 821         unsigned long   flags;
 822
 823         dum = gadget_dev_to_dummy(&_gadget->dev);
 824
 825         if (value && dum->driver) {
 826                 if (mod_data.is_super_speed)
 827                         dum->gadget.speed = dum->driver->speed;
 828                 else if (mod_data.is_high_speed)
 829                         dum->gadget.speed = min_t(u8, USB_SPEED_HIGH,
 830                                         dum->driver->speed);
 831                 else
 832                         dum->gadget.speed = USB_SPEED_FULL;
 833                 dummy_udc_udpate_ep0(dum);
 834
 835                 if (dum->gadget.speed < dum->driver->speed)
 836                         dev_dbg(udc_dev(dum), "This device can perform faster"
 837                                         " if you connect it to a %s port...\n",
 838                                         (dum->driver->speed == USB_SPEED_SUPER ?
 839                                          "SuperSpeed" : "HighSpeed"));
 840         }
 841         dum_hcd = gadget_to_dummy_hcd(_gadget);
 842
 843         spin_lock_irqsave (&dum->lock, flags);
 844         dum->pullup = (value != 0);
 845         set_link_state(dum_hcd);
 846         spin_unlock_irqrestore (&dum->lock, flags);
 847
 848         usb_hcd_poll_rh_status(dummy_hcd_to_hcd(dum_hcd));
 849         return 0;
 850 }
 851
 852 static int dummy_udc_start(struct usb_gadget *g,
 853                 struct usb_gadget_driver *driver);
 854 static int dummy_udc_stop(struct usb_gadget *g,
 855                 struct usb_gadget_driver *driver);
 856
 857 static const struct usb_gadget_ops dummy_ops = {
 858         .get_frame      = dummy_g_get_frame,
 859         .wakeup         = dummy_wakeup,
 860         .set_selfpowered = dummy_set_selfpowered,
 861         .pullup         = dummy_pullup,
 862         .udc_start      = dummy_udc_start,
 863         .udc_stop       = dummy_udc_stop,
 864 };
 865
 866 /*-------------------------------------------------------------------------*/
 867
 868 /* "function" sysfs attribute */
 869 static ssize_t
 870 show_function (struct device *dev, struct device_attribute *attr, char *buf)
 871 {
 872         struct dummy    *dum = gadget_dev_to_dummy (dev);
 873
 874         if (!dum->driver || !dum->driver->function)
 875                 return 0;
 876         return scnprintf (buf, PAGE_SIZE, "%s\n", dum->driver->function);
 877 }
 878 static DEVICE_ATTR (function, S_IRUGO, show_function, NULL);
 879
 880 /*-------------------------------------------------------------------------*/
 881
 882 /*
 883  * Driver registration/unregistration.
 884  *
 885  * This is basically hardware-specific; there's usually only one real USB
 886  * device (not host) controller since that's how USB devices are intended
 887  * to work.  So most implementations of these api calls will rely on the
 888  * fact that only one driver will ever bind to the hardware.  But curious
 889  * hardware can be built with discrete components, so the gadget API doesn't
 890  * require that assumption.
 891  *
 892  * For this emulator, it might be convenient to create a usb slave device
 893  * for each driver that registers:  just add to a big root hub.
 894  */
 895
 896 static int dummy_udc_start(struct usb_gadget *g,
 897                 struct usb_gadget_driver *driver)
 898 {
 899         struct dummy_hcd        *dum_hcd = gadget_to_dummy_hcd(g);
 900         struct dummy            *dum = dum_hcd->dum;
 901
 902         if (driver->speed == USB_SPEED_UNKNOWN)
 903                 return -EINVAL;
 904
 905         /*
 906          * SLAVE side init ... the layer above hardware, which
 907          * can't enumerate without help from the driver we're binding.
 908          */
 909
 910         dum->devstatus = 0;
 911
 912         dum->driver = driver;
 913         dev_dbg (udc_dev(dum), "binding gadget driver '%s'\n",
 914                         driver->driver.name);
 915         return 0;
 916 }
 917
 918 static int dummy_udc_stop(struct usb_gadget *g,
 919                 struct usb_gadget_driver *driver)
 920 {
 921         struct dummy_hcd        *dum_hcd = gadget_to_dummy_hcd(g);
 922         struct dummy            *dum = dum_hcd->dum;
 923
 924         dev_dbg (udc_dev(dum), "unregister gadget driver '%s'\n",
 925                         driver->driver.name);
 926
 927         dum->driver = NULL;
 928
 929         return 0;
 930 }
 931
 932 #undef is_enabled
 933
 934 /* The gadget structure is stored inside the hcd structure and will be
 935  * released along with it. */
 936 static void
 937 dummy_gadget_release (struct device *dev)
 938 {
 939         return;
 940 }
 941
 942 static void init_dummy_udc_hw(struct dummy *dum)
 943 {
 944         int i;
 945
 946         INIT_LIST_HEAD(&dum->gadget.ep_list);
 947         for (i = 0; i < DUMMY_ENDPOINTS; i++) {
 948                 struct dummy_ep *ep = &dum->ep[i];
 949
 950                 if (!ep_name[i])
 951                         break;
 952                 ep->ep.name = ep_name[i];
 953                 ep->ep.ops = &dummy_ep_ops;
 954                 list_add_tail(&ep->ep.ep_list, &dum->gadget.ep_list);
 955                 ep->halted = ep->wedged = ep->already_seen =
 956                                 ep->setup_stage = 0;
 957                 ep->ep.maxpacket = ~0;
 958                 ep->last_io = jiffies;
 959                 ep->gadget = &dum->gadget;
 960                 ep->desc = NULL;
 961                 INIT_LIST_HEAD(&ep->queue);
 962         }
 963
 964         dum->gadget.ep0 = &dum->ep[0].ep;
 965         list_del_init(&dum->ep[0].ep.ep_list);
 966         INIT_LIST_HEAD(&dum->fifo_req.queue);
 967
 968 #ifdef CONFIG_USB_OTG
 969         dum->gadget.is_otg = 1;
 970 #endif
 971 }
 972
 973 static int dummy_udc_probe (struct platform_device *pdev)
 974 {
 975         struct dummy    *dum = &the_controller;
 976         int             rc;
 977
 978         dum->gadget.name = gadget_name;
 979         dum->gadget.ops = &dummy_ops;
 980         dum->gadget.is_dualspeed = 1;
 981
 982         dev_set_name(&dum->gadget.dev, "gadget");
 983         dum->gadget.dev.parent = &pdev->dev;
 984         dum->gadget.dev.release = dummy_gadget_release;
 985         rc = device_register (&dum->gadget.dev);
 986         if (rc < 0) {
 987                 put_device(&dum->gadget.dev);
 988                 return rc;
 989         }
 990
 991         init_dummy_udc_hw(dum);
 992
 993         rc = usb_add_gadget_udc(&pdev->dev, &dum->gadget);
 994         if (rc < 0)
 995                 goto err_udc;
 996
 997         rc = device_create_file (&dum->gadget.dev, &dev_attr_function);
 998         if (rc < 0)
 999                 goto err_dev;
1000         platform_set_drvdata(pdev, dum);
1001         return rc;
1002
1003 err_dev:
1004         usb_del_gadget_udc(&dum->gadget);
1005 err_udc:
1006         device_unregister(&dum->gadget.dev);
1007         return rc;
1008 }
1009
1010 static int dummy_udc_remove (struct platform_device *pdev)
1011 {
1012         struct dummy    *dum = platform_get_drvdata (pdev);
1013
1014         usb_del_gadget_udc(&dum->gadget);
1015         platform_set_drvdata (pdev, NULL);
1016         device_remove_file (&dum->gadget.dev, &dev_attr_function);
1017         device_unregister (&dum->gadget.dev);
1018         return 0;
1019 }
1020
1021 static void dummy_udc_pm(struct dummy *dum, struct dummy_hcd *dum_hcd,
1022                 int suspend)
1023 {
1024         spin_lock_irq(&dum->lock);
1025         dum->udc_suspended = suspend;
1026         set_link_state(dum_hcd);
1027         spin_unlock_irq(&dum->lock);
1028 }
1029
1030 static int dummy_udc_suspend(struct platform_device *pdev, pm_message_t state)
1031 {
1032         struct dummy            *dum = platform_get_drvdata(pdev);
1033         struct dummy_hcd        *dum_hcd = gadget_to_dummy_hcd(&dum->gadget);
1034
1035         dev_dbg(&pdev->dev, "%s\n", __func__);
1036         dummy_udc_pm(dum, dum_hcd, 1);
1037         usb_hcd_poll_rh_status(dummy_hcd_to_hcd(dum_hcd));
1038         return 0;
1039 }
1040
1041 static int dummy_udc_resume(struct platform_device *pdev)
1042 {
1043         struct dummy            *dum = platform_get_drvdata(pdev);
1044         struct dummy_hcd        *dum_hcd = gadget_to_dummy_hcd(&dum->gadget);
1045
1046         dev_dbg(&pdev->dev, "%s\n", __func__);
1047         dummy_udc_pm(dum, dum_hcd, 0);
1048         usb_hcd_poll_rh_status(dummy_hcd_to_hcd(dum_hcd));
1049         return 0;
1050 }
1051
1052 static struct platform_driver dummy_udc_driver = {
1053         .probe          = dummy_udc_probe,
1054         .remove         = dummy_udc_remove,
1055         .suspend        = dummy_udc_suspend,
1056         .resume         = dummy_udc_resume,
1057         .driver         = {
1058                 .name   = (char *) gadget_name,
1059                 .owner  = THIS_MODULE,
1060         },
1061 };
1062
1063 /*-------------------------------------------------------------------------*/
1064
1065 /* MASTER/HOST SIDE DRIVER
1066  *
1067  * this uses the hcd framework to hook up to host side drivers.
1068  * its root hub will only have one device, otherwise it acts like
1069  * a normal host controller.
1070  *
1071  * when urbs are queued, they're just stuck on a list that we
1072  * scan in a timer callback.  that callback connects writes from
1073  * the host with reads from the device, and so on, based on the
1074  * usb 2.0 rules.
1075  */
1076
1077 static int dummy_urb_enqueue (
1078         struct usb_hcd                  *hcd,
1079         struct urb                      *urb,
1080         gfp_t                           mem_flags
1081 ) {
1082         struct dummy_hcd *dum_hcd;
1083         struct urbp     *urbp;
1084         unsigned long   flags;
1085         int             rc;
1086
1087         if (!urb->transfer_buffer && urb->transfer_buffer_length)
1088                 return -EINVAL;
1089
1090         urbp = kmalloc (sizeof *urbp, mem_flags);
1091         if (!urbp)
1092                 return -ENOMEM;
1093         urbp->urb = urb;
1094
1095         dum_hcd = hcd_to_dummy_hcd(hcd);
1096         spin_lock_irqsave(&dum_hcd->dum->lock, flags);
1097         rc = usb_hcd_link_urb_to_ep(hcd, urb);
1098         if (rc) {
1099                 kfree(urbp);
1100                 goto done;
1101         }
1102
1103         if (!dum_hcd->udev) {
1104                 dum_hcd->udev = urb->dev;
1105                 usb_get_dev(dum_hcd->udev);
1106         } else if (unlikely(dum_hcd->udev != urb->dev))
1107                 dev_err(dummy_dev(dum_hcd), "usb_device address has changed!\n");
1108
1109         list_add_tail(&urbp->urbp_list, &dum_hcd->urbp_list);
1110         urb->hcpriv = urbp;
1111         if (usb_pipetype (urb->pipe) == PIPE_CONTROL)
1112                 urb->error_count = 1;           /* mark as a new urb */
1113
1114         /* kick the scheduler, it'll do the rest */
1115         if (!timer_pending(&dum_hcd->timer))
1116                 mod_timer(&dum_hcd->timer, jiffies + 1);
1117
1118  done:
1119         spin_unlock_irqrestore(&dum_hcd->dum->lock, flags);
1120         return rc;
1121 }
1122
1123 static int dummy_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
1124 {
1125         struct dummy_hcd *dum_hcd;
1126         unsigned long   flags;
1127         int             rc;
1128
1129         /* giveback happens automatically in timer callback,
1130          * so make sure the callback happens */
1131         dum_hcd = hcd_to_dummy_hcd(hcd);
1132         spin_lock_irqsave(&dum_hcd->dum->lock, flags);
1133
1134         rc = usb_hcd_check_unlink_urb(hcd, urb, status);
1135         if (!rc && dum_hcd->rh_state != DUMMY_RH_RUNNING &&
1136                         !list_empty(&dum_hcd->urbp_list))
1137                 mod_timer(&dum_hcd->timer, jiffies);
1138
1139         spin_unlock_irqrestore(&dum_hcd->dum->lock, flags);
1140         return rc;
1141 }
1142
1143 /* transfer up to a frame's worth; caller must own lock */
1144 static int
1145 transfer(struct dummy *dum, struct urb *urb, struct dummy_ep *ep, int limit,
1146                 int *status)
1147 {
1148         struct dummy_request    *req;
1149
1150 top:
1151         /* if there's no request queued, the device is NAKing; return */
1152         list_for_each_entry (req, &ep->queue, queue) {
1153                 unsigned        host_len, dev_len, len;
1154                 int             is_short, to_host;
1155                 int             rescan = 0;
1156
1157                 /* 1..N packets of ep->ep.maxpacket each ... the last one
1158                  * may be short (including zero length).
1159                  *
1160                  * writer can send a zlp explicitly (length 0) or implicitly
1161                  * (length mod maxpacket zero, and 'zero' flag); they always
1162                  * terminate reads.
1163                  */
1164                 host_len = urb->transfer_buffer_length - urb->actual_length;
1165                 dev_len = req->req.length - req->req.actual;
1166                 len = min (host_len, dev_len);
1167
1168                 /* FIXME update emulated data toggle too */
1169
1170                 to_host = usb_pipein (urb->pipe);
1171                 if (unlikely (len == 0))
1172                         is_short = 1;
1173                 else {
1174                         char            *ubuf, *rbuf;
1175
1176                         /* not enough bandwidth left? */
1177                         if (limit < ep->ep.maxpacket && limit < len)
1178                                 break;
1179                         len = min (len, (unsigned) limit);
1180                         if (len == 0)
1181                                 break;
1182
1183                         /* use an extra pass for the final short packet */
1184                         if (len > ep->ep.maxpacket) {
1185                                 rescan = 1;
1186                                 len -= (len % ep->ep.maxpacket);
1187                         }
1188                         is_short = (len % ep->ep.maxpacket) != 0;
1189
1190                         /* else transfer packet(s) */
1191                         ubuf = urb->transfer_buffer + urb->actual_length;
1192                         rbuf = req->req.buf + req->req.actual;
1193                         if (to_host)
1194                                 memcpy (ubuf, rbuf, len);
1195                         else
1196                                 memcpy (rbuf, ubuf, len);
1197                         ep->last_io = jiffies;
1198
1199                         limit -= len;
1200                         urb->actual_length += len;
1201                         req->req.actual += len;
1202                 }
1203
1204                 /* short packets terminate, maybe with overflow/underflow.
1205                  * it's only really an error to write too much.
1206                  *
1207                  * partially filling a buffer optionally blocks queue advances
1208                  * (so completion handlers can clean up the queue) but we don't
1209                  * need to emulate such data-in-flight.
1210                  */
1211                 if (is_short) {
1212                         if (host_len == dev_len) {
1213                                 req->req.status = 0;
1214                                 *status = 0;
1215                         } else if (to_host) {
1216                                 req->req.status = 0;
1217                                 if (dev_len > host_len)
1218                                         *status = -EOVERFLOW;
1219                                 else
1220                                         *status = 0;
1221                         } else if (!to_host) {
1222                                 *status = 0;
1223                                 if (host_len > dev_len)
1224                                         req->req.status = -EOVERFLOW;
1225                                 else
1226                                         req->req.status = 0;
1227                         }
1228
1229                 /* many requests terminate without a short packet */
1230                 } else {
1231                         if (req->req.length == req->req.actual
1232                                         && !req->req.zero)
1233                                 req->req.status = 0;
1234                         if (urb->transfer_buffer_length == urb->actual_length
1235                                         && !(urb->transfer_flags
1236                                                 & URB_ZERO_PACKET))
1237                                 *status = 0;
1238                 }
1239
1240                 /* device side completion --> continuable */
1241                 if (req->req.status != -EINPROGRESS) {
1242                         list_del_init (&req->queue);
1243
1244                         spin_unlock (&dum->lock);
1245                         req->req.complete (&ep->ep, &req->req);
1246                         spin_lock (&dum->lock);
1247
1248                         /* requests might have been unlinked... */
1249                         rescan = 1;
1250                 }
1251
1252                 /* host side completion --> terminate */
1253                 if (*status != -EINPROGRESS)
1254                         break;
1255
1256                 /* rescan to continue with any other queued i/o */
1257                 if (rescan)
1258                         goto top;
1259         }
1260         return limit;
1261 }
1262
1263 static int periodic_bytes (struct dummy *dum, struct dummy_ep *ep)
1264 {
1265         int     limit = ep->ep.maxpacket;
1266
1267         if (dum->gadget.speed == USB_SPEED_HIGH) {
1268                 int     tmp;
1269
1270                 /* high bandwidth mode */
1271                 tmp = usb_endpoint_maxp(ep->desc);
1272                 tmp = (tmp >> 11) & 0x03;
1273                 tmp *= 8 /* applies to entire frame */;
1274                 limit += limit * tmp;
1275         }
1276         if (dum->gadget.speed == USB_SPEED_SUPER) {
1277                 switch (ep->desc->bmAttributes & 0x03) {
1278                 case USB_ENDPOINT_XFER_ISOC:
1279                         /* Sec. 4.4.8.2 USB3.0 Spec */
1280                         limit = 3 * 16 * 1024 * 8;
1281                         break;
1282                 case USB_ENDPOINT_XFER_INT:
1283                         /* Sec. 4.4.7.2 USB3.0 Spec */
1284                         limit = 3 * 1024 * 8;
1285                         break;
1286                 case USB_ENDPOINT_XFER_BULK:
1287                 default:
1288                         break;
1289                 }
1290         }
1291         return limit;
1292 }
1293
1294 #define is_active(dum_hcd)      ((dum_hcd->port_status & \
1295                 (USB_PORT_STAT_CONNECTION | USB_PORT_STAT_ENABLE | \
1296                         USB_PORT_STAT_SUSPEND)) \
1297                 == (USB_PORT_STAT_CONNECTION | USB_PORT_STAT_ENABLE))
1298
1299 static struct dummy_ep *find_endpoint (struct dummy *dum, u8 address)
1300 {
1301         int             i;
1302
1303         if (!is_active((dum->gadget.speed == USB_SPEED_SUPER ?
1304                         dum->ss_hcd : dum->hs_hcd)))
1305                 return NULL;
1306         if ((address & ~USB_DIR_IN) == 0)
1307                 return &dum->ep [0];
1308         for (i = 1; i < DUMMY_ENDPOINTS; i++) {
1309                 struct dummy_ep *ep = &dum->ep [i];
1310
1311                 if (!ep->desc)
1312                         continue;
1313                 if (ep->desc->bEndpointAddress == address)
1314                         return ep;
1315         }
1316         return NULL;
1317 }
1318
1319 #undef is_active
1320
1321 #define Dev_Request     (USB_TYPE_STANDARD | USB_RECIP_DEVICE)
1322 #define Dev_InRequest   (Dev_Request | USB_DIR_IN)
1323 #define Intf_Request    (USB_TYPE_STANDARD | USB_RECIP_INTERFACE)
1324 #define Intf_InRequest  (Intf_Request | USB_DIR_IN)
1325 #define Ep_Request      (USB_TYPE_STANDARD | USB_RECIP_ENDPOINT)
1326 #define Ep_InRequest    (Ep_Request | USB_DIR_IN)
1327
1328
1329 /**
1330  * handle_control_request() - handles all control transfers
1331  * @dum: pointer to dummy (the_controller)
1332  * @urb: the urb request to handle
1333  * @setup: pointer to the setup data for a USB device control
1334  *       request
1335  * @status: pointer to request handling status
1336  *
1337  * Return 0 - if the request was handled
1338  *        1 - if the request wasn't handles
1339  *        error code on error
1340  */
1341 static int handle_control_request(struct dummy_hcd *dum_hcd, struct urb *urb,
1342                                   struct usb_ctrlrequest *setup,
1343                                   int *status)
1344 {
1345         struct dummy_ep         *ep2;
1346         struct dummy            *dum = dum_hcd->dum;
1347         int                     ret_val = 1;
1348         unsigned        w_index;
1349         unsigned        w_value;
1350
1351         w_index = le16_to_cpu(setup->wIndex);
1352         w_value = le16_to_cpu(setup->wValue);
1353         switch (setup->bRequest) {
1354         case USB_REQ_SET_ADDRESS:
1355                 if (setup->bRequestType != Dev_Request)
1356                         break;
1357                 dum->address = w_value;
1358                 *status = 0;
1359                 dev_dbg(udc_dev(dum), "set_address = %d\n",
1360                                 w_value);
1361                 ret_val = 0;
1362                 break;
1363         case USB_REQ_SET_FEATURE:
1364                 if (setup->bRequestType == Dev_Request) {
1365                         ret_val = 0;
1366                         switch (w_value) {
1367                         case USB_DEVICE_REMOTE_WAKEUP:
1368                                 break;
1369                         case USB_DEVICE_B_HNP_ENABLE:
1370                                 dum->gadget.b_hnp_enable = 1;
1371                                 break;
1372                         case USB_DEVICE_A_HNP_SUPPORT:
1373                                 dum->gadget.a_hnp_support = 1;
1374                                 break;
1375                         case USB_DEVICE_A_ALT_HNP_SUPPORT:
1376                                 dum->gadget.a_alt_hnp_support = 1;
1377                                 break;
1378                         case USB_DEVICE_U1_ENABLE:
1379                                 if (dummy_hcd_to_hcd(dum_hcd)->speed ==
1380                                     HCD_USB3)
1381                                         w_value = USB_DEV_STAT_U1_ENABLED;
1382                                 else
1383                                         ret_val = -EOPNOTSUPP;
1384                                 break;
1385                         case USB_DEVICE_U2_ENABLE:
1386                                 if (dummy_hcd_to_hcd(dum_hcd)->speed ==
1387                                     HCD_USB3)
1388                                         w_value = USB_DEV_STAT_U2_ENABLED;
1389                                 else
1390                                         ret_val = -EOPNOTSUPP;
1391                                 break;
1392                         case USB_DEVICE_LTM_ENABLE:
1393                                 if (dummy_hcd_to_hcd(dum_hcd)->speed ==
1394                                     HCD_USB3)
1395                                         w_value = USB_DEV_STAT_LTM_ENABLED;
1396                                 else
1397                                         ret_val = -EOPNOTSUPP;
1398                                 break;
1399                         default:
1400                                 ret_val = -EOPNOTSUPP;
1401                         }
1402                         if (ret_val == 0) {
1403                                 dum->devstatus |= (1 << w_value);
1404                                 *status = 0;
1405                         }
1406                 } else if (setup->bRequestType == Ep_Request) {
1407                         /* endpoint halt */
1408                         ep2 = find_endpoint(dum, w_index);
1409                         if (!ep2 || ep2->ep.name == ep0name) {
1410                                 ret_val = -EOPNOTSUPP;
1411                                 break;
1412                         }
1413                         ep2->halted = 1;
1414                         ret_val = 0;
1415                         *status = 0;
1416                 }
1417                 break;
1418         case USB_REQ_CLEAR_FEATURE:
1419                 if (setup->bRequestType == Dev_Request) {
1420                         ret_val = 0;
1421                         switch (w_value) {
1422                         case USB_DEVICE_REMOTE_WAKEUP:
1423                                 w_value = USB_DEVICE_REMOTE_WAKEUP;
1424                                 break;
1425                         case USB_DEVICE_U1_ENABLE:
1426                                 if (dummy_hcd_to_hcd(dum_hcd)->speed ==
1427                                     HCD_USB3)
1428                                         w_value = USB_DEV_STAT_U1_ENABLED;
1429                                 else
1430                                         ret_val = -EOPNOTSUPP;
1431                                 break;
1432                         case USB_DEVICE_U2_ENABLE:
1433                                 if (dummy_hcd_to_hcd(dum_hcd)->speed ==
1434                                     HCD_USB3)
1435                                         w_value = USB_DEV_STAT_U2_ENABLED;
1436                                 else
1437                                         ret_val = -EOPNOTSUPP;
1438                                 break;
1439                         case USB_DEVICE_LTM_ENABLE:
1440                                 if (dummy_hcd_to_hcd(dum_hcd)->speed ==
1441                                     HCD_USB3)
1442                                         w_value = USB_DEV_STAT_LTM_ENABLED;
1443                                 else
1444                                         ret_val = -EOPNOTSUPP;
1445                                 break;
1446                         default:
1447                                 ret_val = -EOPNOTSUPP;
1448                                 break;
1449                         }
1450                         if (ret_val == 0) {
1451                                 dum->devstatus &= ~(1 << w_value);
1452                                 *status = 0;
1453                         }
1454                 } else if (setup->bRequestType == Ep_Request) {
1455                         /* endpoint halt */
1456                         ep2 = find_endpoint(dum, w_index);
1457                         if (!ep2) {
1458                                 ret_val = -EOPNOTSUPP;
1459                                 break;
1460                         }
1461                         if (!ep2->wedged)
1462                                 ep2->halted = 0;
1463                         ret_val = 0;
1464                         *status = 0;
1465                 }
1466                 break;
1467         case USB_REQ_GET_STATUS:
1468                 if (setup->bRequestType == Dev_InRequest
1469                                 || setup->bRequestType == Intf_InRequest
1470                                 || setup->bRequestType == Ep_InRequest) {
1471                         char *buf;
1472                         /*
1473                          * device: remote wakeup, selfpowered
1474                          * interface: nothing
1475                          * endpoint: halt
1476                          */
1477                         buf = (char *)urb->transfer_buffer;
1478                         if (urb->transfer_buffer_length > 0) {
1479                                 if (setup->bRequestType == Ep_InRequest) {
1480                                         ep2 = find_endpoint(dum, w_index);
1481                                         if (!ep2) {
1482                                                 ret_val = -EOPNOTSUPP;
1483                                                 break;
1484                                         }
1485                                         buf[0] = ep2->halted;
1486                                 } else if (setup->bRequestType ==
1487                                            Dev_InRequest) {
1488                                         buf[0] = (u8)dum->devstatus;
1489                                 } else
1490                                         buf[0] = 0;
1491                         }
1492                         if (urb->transfer_buffer_length > 1)
1493                                 buf[1] = 0;
1494                         urb->actual_length = min_t(u32, 2,
1495                                 urb->transfer_buffer_length);
1496                         ret_val = 0;
1497                         *status = 0;
1498                 }
1499                 break;
1500         }
1501         return ret_val;
1502 }
1503
1504 /* drive both sides of the transfers; looks like irq handlers to
1505  * both drivers except the callbacks aren't in_irq().
1506  */
1507 static void dummy_timer(unsigned long _dum_hcd)
1508 {
1509         struct dummy_hcd        *dum_hcd = (struct dummy_hcd *) _dum_hcd;
1510         struct dummy            *dum = dum_hcd->dum;
1511         struct urbp             *urbp, *tmp;
1512         unsigned long           flags;
1513         int                     limit, total;
1514         int                     i;
1515
1516         /* simplistic model for one frame's bandwidth */
1517         switch (dum->gadget.speed) {
1518         case USB_SPEED_LOW:
1519                 total = 8/*bytes*/ * 12/*packets*/;
1520                 break;
1521         case USB_SPEED_FULL:
1522                 total = 64/*bytes*/ * 19/*packets*/;
1523                 break;
1524         case USB_SPEED_HIGH:
1525                 total = 512/*bytes*/ * 13/*packets*/ * 8/*uframes*/;
1526                 break;
1527         case USB_SPEED_SUPER:
1528                 /* Bus speed is 500000 bytes/ms, so use a little less */
1529                 total = 490000;
1530                 break;
1531         default:
1532                 dev_err(dummy_dev(dum_hcd), "bogus device speed\n");
1533                 return;
1534         }
1535
1536         /* FIXME if HZ != 1000 this will probably misbehave ... */
1537
1538         /* look at each urb queued by the host side driver */
1539         spin_lock_irqsave (&dum->lock, flags);
1540
1541         if (!dum_hcd->udev) {
1542                 dev_err(dummy_dev(dum_hcd),
1543                                 "timer fired with no URBs pending?\n");
1544                 spin_unlock_irqrestore (&dum->lock, flags);
1545                 return;
1546         }
1547
1548         for (i = 0; i < DUMMY_ENDPOINTS; i++) {
1549                 if (!ep_name [i])
1550                         break;
1551                 dum->ep [i].already_seen = 0;
1552         }
1553
1554 restart:
1555         list_for_each_entry_safe(urbp, tmp, &dum_hcd->urbp_list, urbp_list) {
1556                 struct urb              *urb;
1557                 struct dummy_request    *req;
1558                 u8                      address;
1559                 struct dummy_ep         *ep = NULL;
1560                 int                     type;
1561                 int                     status = -EINPROGRESS;
1562
1563                 urb = urbp->urb;
1564                 if (urb->unlinked)
1565                         goto return_urb;
1566                 else if (dum_hcd->rh_state != DUMMY_RH_RUNNING)
1567                         continue;
1568                 type = usb_pipetype (urb->pipe);
1569
1570                 /* used up this frame's non-periodic bandwidth?
1571                  * FIXME there's infinite bandwidth for control and
1572                  * periodic transfers ... unrealistic.
1573                  */
1574                 if (total <= 0 && type == PIPE_BULK)
1575                         continue;
1576
1577                 /* find the gadget's ep for this request (if configured) */
1578                 address = usb_pipeendpoint (urb->pipe);
1579                 if (usb_pipein (urb->pipe))
1580                         address |= USB_DIR_IN;
1581                 ep = find_endpoint(dum, address);
1582                 if (!ep) {
1583                         /* set_configuration() disagreement */
1584                         dev_dbg(dummy_dev(dum_hcd),
1585                                 "no ep configured for urb %p\n",
1586                                 urb);
1587                         status = -EPROTO;
1588                         goto return_urb;
1589                 }
1590
1591                 if (ep->already_seen)
1592                         continue;
1593                 ep->already_seen = 1;
1594                 if (ep == &dum->ep [0] && urb->error_count) {
1595                         ep->setup_stage = 1;    /* a new urb */
1596                         urb->error_count = 0;
1597                 }
1598                 if (ep->halted && !ep->setup_stage) {
1599                         /* NOTE: must not be iso! */
1600                         dev_dbg(dummy_dev(dum_hcd), "ep %s halted, urb %p\n",
1601                                         ep->ep.name, urb);
1602                         status = -EPIPE;
1603                         goto return_urb;
1604                 }
1605                 /* FIXME make sure both ends agree on maxpacket */
1606
1607                 /* handle control requests */
1608                 if (ep == &dum->ep [0] && ep->setup_stage) {
1609                         struct usb_ctrlrequest          setup;
1610                         int                             value = 1;
1611
1612                         setup = *(struct usb_ctrlrequest*) urb->setup_packet;
1613                         /* paranoia, in case of stale queued data */
1614                         list_for_each_entry (req, &ep->queue, queue) {
1615                                 list_del_init (&req->queue);
1616                                 req->req.status = -EOVERFLOW;
1617                                 dev_dbg (udc_dev(dum), "stale req = %p\n",
1618                                                 req);
1619
1620                                 spin_unlock (&dum->lock);
1621                                 req->req.complete (&ep->ep, &req->req);
1622                                 spin_lock (&dum->lock);
1623                                 ep->already_seen = 0;
1624                                 goto restart;
1625                         }
1626
1627                         /* gadget driver never sees set_address or operations
1628                          * on standard feature flags.  some hardware doesn't
1629                          * even expose them.
1630                          */
1631                         ep->last_io = jiffies;
1632                         ep->setup_stage = 0;
1633                         ep->halted = 0;
1634
1635                         value = handle_control_request(dum_hcd, urb, &setup,
1636                                                        &status);
1637
1638                         /* gadget driver handles all other requests.  block
1639                          * until setup() returns; no reentrancy issues etc.
1640                          */
1641                         if (value > 0) {
1642                                 spin_unlock (&dum->lock);
1643                                 value = dum->driver->setup (&dum->gadget,
1644                                                 &setup);
1645                                 spin_lock (&dum->lock);
1646
1647                                 if (value >= 0) {
1648                                         /* no delays (max 64KB data stage) */
1649                                         limit = 64*1024;
1650                                         goto treat_control_like_bulk;
1651                                 }
1652                                 /* error, see below */
1653                         }
1654
1655                         if (value < 0) {
1656                                 if (value != -EOPNOTSUPP)
1657                                         dev_dbg (udc_dev(dum),
1658                                                 "setup --> %d\n",
1659                                                 value);
1660                                 status = -EPIPE;
1661                                 urb->actual_length = 0;
1662                         }
1663
1664                         goto return_urb;
1665                 }
1666
1667                 /* non-control requests */
1668                 limit = total;
1669                 switch (usb_pipetype (urb->pipe)) {
1670                 case PIPE_ISOCHRONOUS:
1671                         /* FIXME is it urb->interval since the last xfer?
1672                          * use urb->iso_frame_desc[i].
1673                          * complete whether or not ep has requests queued.
1674                          * report random errors, to debug drivers.
1675                          */
1676                         limit = max (limit, periodic_bytes (dum, ep));
1677                         status = -ENOSYS;
1678                         break;
1679
1680                 case PIPE_INTERRUPT:
1681                         /* FIXME is it urb->interval since the last xfer?
1682                          * this almost certainly polls too fast.
1683                          */
1684                         limit = max (limit, periodic_bytes (dum, ep));
1685                         /* FALLTHROUGH */
1686
1687                 // case PIPE_BULK:  case PIPE_CONTROL:
1688                 default:
1689                 treat_control_like_bulk:
1690                         ep->last_io = jiffies;
1691                         total = transfer(dum, urb, ep, limit, &status);
1692                         break;
1693                 }
1694
1695                 /* incomplete transfer? */
1696                 if (status == -EINPROGRESS)
1697                         continue;
1698
1699 return_urb:
1700                 list_del (&urbp->urbp_list);
1701                 kfree (urbp);
1702                 if (ep)
1703                         ep->already_seen = ep->setup_stage = 0;
1704
1705                 usb_hcd_unlink_urb_from_ep(dummy_hcd_to_hcd(dum_hcd), urb);
1706                 spin_unlock (&dum->lock);
1707                 usb_hcd_giveback_urb(dummy_hcd_to_hcd(dum_hcd), urb, status);
1708                 spin_lock (&dum->lock);
1709
1710                 goto restart;
1711         }
1712
1713         if (list_empty(&dum_hcd->urbp_list)) {
1714                 usb_put_dev(dum_hcd->udev);
1715                 dum_hcd->udev = NULL;
1716         } else if (dum_hcd->rh_state == DUMMY_RH_RUNNING) {
1717                 /* want a 1 msec delay here */
1718                 mod_timer(&dum_hcd->timer, jiffies + msecs_to_jiffies(1));
1719         }
1720
1721         spin_unlock_irqrestore (&dum->lock, flags);
1722 }
1723
1724 /*-------------------------------------------------------------------------*/
1725
1726 #define PORT_C_MASK \
1727         ((USB_PORT_STAT_C_CONNECTION \
1728         | USB_PORT_STAT_C_ENABLE \
1729         | USB_PORT_STAT_C_SUSPEND \
1730         | USB_PORT_STAT_C_OVERCURRENT \
1731         | USB_PORT_STAT_C_RESET) << 16)
1732
1733 static int dummy_hub_status (struct usb_hcd *hcd, char *buf)
1734 {
1735         struct dummy_hcd        *dum_hcd;
1736         unsigned long           flags;
1737         int                     retval = 0;
1738
1739         dum_hcd = hcd_to_dummy_hcd(hcd);
1740
1741         spin_lock_irqsave(&dum_hcd->dum->lock, flags);
1742         if (!HCD_HW_ACCESSIBLE(hcd))
1743                 goto done;
1744
1745         if (dum_hcd->resuming && time_after_eq(jiffies, dum_hcd->re_timeout)) {
1746                 dum_hcd->port_status |= (USB_PORT_STAT_C_SUSPEND << 16);
1747                 dum_hcd->port_status &= ~USB_PORT_STAT_SUSPEND;
1748                 set_link_state(dum_hcd);
1749         }
1750
1751         if ((dum_hcd->port_status & PORT_C_MASK) != 0) {
1752                 *buf = (1 << 1);
1753                 dev_dbg(dummy_dev(dum_hcd), "port status 0x%08x has changes\n",
1754                                 dum_hcd->port_status);
1755                 retval = 1;
1756                 if (dum_hcd->rh_state == DUMMY_RH_SUSPENDED)
1757                         usb_hcd_resume_root_hub (hcd);
1758         }
1759 done:
1760         spin_unlock_irqrestore(&dum_hcd->dum->lock, flags);
1761         return retval;
1762 }
1763
1764 static inline void
1765 ss_hub_descriptor(struct usb_hub_descriptor *desc)
1766 {
1767         memset(desc, 0, sizeof *desc);
1768         desc->bDescriptorType = 0x2a;
1769         desc->bDescLength = 12;
1770         desc->wHubCharacteristics = cpu_to_le16(0x0001);
1771         desc->bNbrPorts = 1;
1772         desc->u.ss.bHubHdrDecLat = 0x04; /* Worst case: 0.4 micro sec*/
1773         desc->u.ss.DeviceRemovable = 0xffff;
1774 }
1775
1776 static inline void
1777 hub_descriptor (struct usb_hub_descriptor *desc)
1778 {
1779         memset (desc, 0, sizeof *desc);
1780         desc->bDescriptorType = 0x29;
1781         desc->bDescLength = 9;
1782         desc->wHubCharacteristics = cpu_to_le16(0x0001);
1783         desc->bNbrPorts = 1;
1784         desc->u.hs.DeviceRemovable[0] = 0xff;
1785         desc->u.hs.DeviceRemovable[1] = 0xff;
1786 }
1787
1788 static int dummy_hub_control (
1789         struct usb_hcd  *hcd,
1790         u16             typeReq,
1791         u16             wValue,
1792         u16             wIndex,
1793         char            *buf,
1794         u16             wLength
1795 ) {
1796         struct dummy_hcd *dum_hcd;
1797         int             retval = 0;
1798         unsigned long   flags;
1799
1800         if (!HCD_HW_ACCESSIBLE(hcd))
1801                 return -ETIMEDOUT;
1802
1803         dum_hcd = hcd_to_dummy_hcd(hcd);
1804
1805         spin_lock_irqsave(&dum_hcd->dum->lock, flags);
1806         switch (typeReq) {
1807         case ClearHubFeature:
1808                 break;
1809         case ClearPortFeature:
1810                 switch (wValue) {
1811                 case USB_PORT_FEAT_SUSPEND:
1812                         if (hcd->speed == HCD_USB3) {
1813                                 dev_dbg(dummy_dev(dum_hcd),
1814                                          "USB_PORT_FEAT_SUSPEND req not "
1815                                          "supported for USB 3.0 roothub\n");
1816                                 goto error;
1817                         }
1818                         if (dum_hcd->port_status & USB_PORT_STAT_SUSPEND) {
1819                                 /* 20msec resume signaling */
1820                                 dum_hcd->resuming = 1;
1821                                 dum_hcd->re_timeout = jiffies +
1822                                                 msecs_to_jiffies(20);
1823                         }
1824                         break;
1825                 case USB_PORT_FEAT_POWER:
1826                         if (hcd->speed == HCD_USB3) {
1827                                 if (dum_hcd->port_status & USB_PORT_STAT_POWER)
1828                                         dev_dbg(dummy_dev(dum_hcd),
1829                                                 "power-off\n");
1830                         } else
1831                                 if (dum_hcd->port_status &
1832                                                         USB_SS_PORT_STAT_POWER)
1833                                         dev_dbg(dummy_dev(dum_hcd),
1834                                                 "power-off\n");
1835                         /* FALLS THROUGH */
1836                 default:
1837                         dum_hcd->port_status &= ~(1 << wValue);
1838                         set_link_state(dum_hcd);
1839                 }
1840                 break;
1841         case GetHubDescriptor:
1842                 if (hcd->speed == HCD_USB3 &&
1843                                 (wLength < USB_DT_SS_HUB_SIZE ||
1844                                  wValue != (USB_DT_SS_HUB << 8))) {
1845                         dev_dbg(dummy_dev(dum_hcd),
1846                                 "Wrong hub descriptor type for "
1847                                 "USB 3.0 roothub.\n");
1848                         goto error;
1849                 }
1850                 if (hcd->speed == HCD_USB3)
1851                         ss_hub_descriptor((struct usb_hub_descriptor *) buf);
1852                 else
1853                         hub_descriptor((struct usb_hub_descriptor *) buf);
1854                 break;
1855         case GetHubStatus:
1856                 *(__le32 *) buf = cpu_to_le32 (0);
1857                 break;
1858         case GetPortStatus:
1859                 if (wIndex != 1)
1860                         retval = -EPIPE;
1861
1862                 /* whoever resets or resumes must GetPortStatus to
1863                  * complete it!!
1864                  */
1865                 if (dum_hcd->resuming &&
1866                                 time_after_eq(jiffies, dum_hcd->re_timeout)) {
1867                         dum_hcd->port_status |= (USB_PORT_STAT_C_SUSPEND << 16);
1868                         dum_hcd->port_status &= ~USB_PORT_STAT_SUSPEND;
1869                 }
1870                 if ((dum_hcd->port_status & USB_PORT_STAT_RESET) != 0 &&
1871                                 time_after_eq(jiffies, dum_hcd->re_timeout)) {
1872                         dum_hcd->port_status |= (USB_PORT_STAT_C_RESET << 16);
1873                         dum_hcd->port_status &= ~USB_PORT_STAT_RESET;
1874                         if (dum_hcd->dum->pullup) {
1875                                 dum_hcd->port_status |= USB_PORT_STAT_ENABLE;
1876
1877                                 if (hcd->speed < HCD_USB3) {
1878                                         switch (dum_hcd->dum->gadget.speed) {
1879                                         case USB_SPEED_HIGH:
1880                                                 dum_hcd->port_status |=
1881                                                       USB_PORT_STAT_HIGH_SPEED;
1882                                                 break;
1883                                         case USB_SPEED_LOW:
1884                                                 dum_hcd->dum->gadget.ep0->
1885                                                         maxpacket = 8;
1886                                                 dum_hcd->port_status |=
1887                                                         USB_PORT_STAT_LOW_SPEED;
1888                                                 break;
1889                                         default:
1890                                                 dum_hcd->dum->gadget.speed =
1891                                                         USB_SPEED_FULL;
1892                                                 break;
1893                                         }
1894                                 }
1895                         }
1896                 }
1897                 set_link_state(dum_hcd);
1898                 ((__le16 *) buf)[0] = cpu_to_le16 (dum_hcd->port_status);
1899                 ((__le16 *) buf)[1] = cpu_to_le16 (dum_hcd->port_status >> 16);
1900                 break;
1901         case SetHubFeature:
1902                 retval = -EPIPE;
1903                 break;
1904         case SetPortFeature:
1905                 switch (wValue) {
1906                 case USB_PORT_FEAT_LINK_STATE:
1907                         if (hcd->speed != HCD_USB3) {
1908                                 dev_dbg(dummy_dev(dum_hcd),
1909                                          "USB_PORT_FEAT_LINK_STATE req not "
1910                                          "supported for USB 2.0 roothub\n");
1911                                 goto error;
1912                         }
1913                         /*
1914                          * Since this is dummy we don't have an actual link so
1915                          * there is nothing to do for the SET_LINK_STATE cmd
1916                          */
1917                         break;
1918                 case USB_PORT_FEAT_U1_TIMEOUT:
1919                 case USB_PORT_FEAT_U2_TIMEOUT:
1920                         /* TODO: add suspend/resume support! */
1921                         if (hcd->speed != HCD_USB3) {
1922                                 dev_dbg(dummy_dev(dum_hcd),
1923                                          "USB_PORT_FEAT_U1/2_TIMEOUT req not "
1924                                          "supported for USB 2.0 roothub\n");
1925                                 goto error;
1926                         }
1927                         break;
1928                 case USB_PORT_FEAT_SUSPEND:
1929                         /* Applicable only for USB2.0 hub */
1930                         if (hcd->speed == HCD_USB3) {
1931                                 dev_dbg(dummy_dev(dum_hcd),
1932                                          "USB_PORT_FEAT_SUSPEND req not "
1933                                          "supported for USB 3.0 roothub\n");
1934                                 goto error;
1935                         }
1936                         if (dum_hcd->active) {
1937                                 dum_hcd->port_status |= USB_PORT_STAT_SUSPEND;
1938
1939                                 /* HNP would happen here; for now we
1940                                  * assume b_bus_req is always true.
1941                                  */
1942                                 set_link_state(dum_hcd);
1943                                 if (((1 << USB_DEVICE_B_HNP_ENABLE)
1944                                                 & dum_hcd->dum->devstatus) != 0)
1945                                         dev_dbg(dummy_dev(dum_hcd),
1946                                                         "no HNP yet!\n");
1947                         }
1948                         break;
1949                 case USB_PORT_FEAT_POWER:
1950                         if (hcd->speed == HCD_USB3)
1951                                 dum_hcd->port_status |= USB_SS_PORT_STAT_POWER;
1952                         else
1953                                 dum_hcd->port_status |= USB_PORT_STAT_POWER;
1954                         set_link_state(dum_hcd);
1955                         break;
1956                 case USB_PORT_FEAT_BH_PORT_RESET:
1957                         /* Applicable only for USB3.0 hub */
1958                         if (hcd->speed != HCD_USB3) {
1959                                 dev_dbg(dummy_dev(dum_hcd),
1960                                          "USB_PORT_FEAT_BH_PORT_RESET req not "
1961                                          "supported for USB 2.0 roothub\n");
1962                                 goto error;
1963                         }
1964                         /* FALLS THROUGH */
1965                 case USB_PORT_FEAT_RESET:
1966                         /* if it's already enabled, disable */
1967                         if (hcd->speed == HCD_USB3) {
1968                                 dum_hcd->port_status = 0;
1969                                 dum_hcd->port_status =
1970                                         (USB_SS_PORT_STAT_POWER |
1971                                          USB_PORT_STAT_CONNECTION |
1972                                          USB_PORT_STAT_RESET);
1973                         } else
1974                                 dum_hcd->port_status &= ~(USB_PORT_STAT_ENABLE
1975                                         | USB_PORT_STAT_LOW_SPEED
1976                                         | USB_PORT_STAT_HIGH_SPEED);
1977                         /*
1978                          * We want to reset device status. All but the
1979                          * Self powered feature
1980                          */
1981                         dum_hcd->dum->devstatus &=
1982                                 (1 << USB_DEVICE_SELF_POWERED);
1983                         /*
1984                          * FIXME USB3.0: what is the correct reset signaling
1985                          * interval? Is it still 50msec as for HS?
1986                          */
1987                         dum_hcd->re_timeout = jiffies + msecs_to_jiffies(50);
1988                         /* FALLS THROUGH */
1989                 default:
1990                         if (hcd->speed == HCD_USB3) {
1991                                 if ((dum_hcd->port_status &
1992                                      USB_SS_PORT_STAT_POWER) != 0) {
1993                                         dum_hcd->port_status |= (1 << wValue);
1994                                         set_link_state(dum_hcd);
1995                                 }
1996                         } else
1997                                 if ((dum_hcd->port_status &
1998                                      USB_PORT_STAT_POWER) != 0) {
1999                                         dum_hcd->port_status |= (1 << wValue);
2000                                         set_link_state(dum_hcd);
2001                                 }
2002                 }
2003                 break;
2004         case GetPortErrorCount:
2005                 if (hcd->speed != HCD_USB3) {
2006                         dev_dbg(dummy_dev(dum_hcd),
2007                                  "GetPortErrorCount req not "
2008                                  "supported for USB 2.0 roothub\n");
2009                         goto error;
2010                 }
2011                 /* We'll always return 0 since this is a dummy hub */
2012                 *(__le32 *) buf = cpu_to_le32(0);
2013                 break;
2014         case SetHubDepth:
2015                 if (hcd->speed != HCD_USB3) {
2016                         dev_dbg(dummy_dev(dum_hcd),
2017                                  "SetHubDepth req not supported for "
2018                                  "USB 2.0 roothub\n");
2019                         goto error;
2020                 }
2021                 break;
2022         default:
2023                 dev_dbg(dummy_dev(dum_hcd),
2024                         "hub control req%04x v%04x i%04x l%d\n",
2025                         typeReq, wValue, wIndex, wLength);
2026 error:
2027                 /* "protocol stall" on error */
2028                 retval = -EPIPE;
2029         }
2030         spin_unlock_irqrestore(&dum_hcd->dum->lock, flags);
2031
2032         if ((dum_hcd->port_status & PORT_C_MASK) != 0)
2033                 usb_hcd_poll_rh_status (hcd);
2034         return retval;
2035 }
2036
2037 static int dummy_bus_suspend (struct usb_hcd *hcd)
2038 {
2039         struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd);
2040
2041         dev_dbg (&hcd->self.root_hub->dev, "%s\n", __func__);
2042
2043         spin_lock_irq(&dum_hcd->dum->lock);
2044         dum_hcd->rh_state = DUMMY_RH_SUSPENDED;
2045         set_link_state(dum_hcd);
2046         hcd->state = HC_STATE_SUSPENDED;
2047         spin_unlock_irq(&dum_hcd->dum->lock);
2048         return 0;
2049 }
2050
2051 static int dummy_bus_resume (struct usb_hcd *hcd)
2052 {
2053         struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd);
2054         int rc = 0;
2055
2056         dev_dbg (&hcd->self.root_hub->dev, "%s\n", __func__);
2057
2058         spin_lock_irq(&dum_hcd->dum->lock);
2059         if (!HCD_HW_ACCESSIBLE(hcd)) {
2060                 rc = -ESHUTDOWN;
2061         } else {
2062                 dum_hcd->rh_state = DUMMY_RH_RUNNING;
2063                 set_link_state(dum_hcd);
2064                 if (!list_empty(&dum_hcd->urbp_list))
2065                         mod_timer(&dum_hcd->timer, jiffies);
2066                 hcd->state = HC_STATE_RUNNING;
2067         }
2068         spin_unlock_irq(&dum_hcd->dum->lock);
2069         return rc;
2070 }
2071
2072 /*-------------------------------------------------------------------------*/
2073
2074 static inline ssize_t
2075 show_urb (char *buf, size_t size, struct urb *urb)
2076 {
2077         int ep = usb_pipeendpoint (urb->pipe);
2078
2079         return snprintf (buf, size,
2080                 "urb/%p %s ep%d%s%s len %d/%d\n",
2081                 urb,
2082                 ({ char *s;
2083                  switch (urb->dev->speed) {
2084                  case USB_SPEED_LOW:
2085                         s = "ls";
2086                         break;
2087                  case USB_SPEED_FULL:
2088                         s = "fs";
2089                         break;
2090                  case USB_SPEED_HIGH:
2091                         s = "hs";
2092                         break;
2093                  case USB_SPEED_SUPER:
2094                         s = "ss";
2095                         break;
2096                  default:
2097                         s = "?";
2098                         break;
2099                  }; s; }),
2100                 ep, ep ? (usb_pipein (urb->pipe) ? "in" : "out") : "",
2101                 ({ char *s; \
2102                  switch (usb_pipetype (urb->pipe)) { \
2103                  case PIPE_CONTROL: \
2104                         s = ""; \
2105                         break; \
2106                  case PIPE_BULK: \
2107                         s = "-bulk"; \
2108                         break; \
2109                  case PIPE_INTERRUPT: \
2110                         s = "-int"; \
2111                         break; \
2112                  default: \
2113                         s = "-iso"; \
2114                         break; \
2115                 }; s;}),
2116                 urb->actual_length, urb->transfer_buffer_length);
2117 }
2118
2119 static ssize_t
2120 show_urbs (struct device *dev, struct device_attribute *attr, char *buf)
2121 {
2122         struct usb_hcd          *hcd = dev_get_drvdata (dev);
2123         struct dummy_hcd        *dum_hcd = hcd_to_dummy_hcd(hcd);
2124         struct urbp             *urbp;
2125         size_t                  size = 0;
2126         unsigned long           flags;
2127
2128         spin_lock_irqsave(&dum_hcd->dum->lock, flags);
2129         list_for_each_entry(urbp, &dum_hcd->urbp_list, urbp_list) {
2130                 size_t          temp;
2131
2132                 temp = show_urb (buf, PAGE_SIZE - size, urbp->urb);
2133                 buf += temp;
2134                 size += temp;
2135         }
2136         spin_unlock_irqrestore(&dum_hcd->dum->lock, flags);
2137
2138         return size;
2139 }
2140 static DEVICE_ATTR (urbs, S_IRUGO, show_urbs, NULL);
2141
2142 static int dummy_start_ss(struct dummy_hcd *dum_hcd)
2143 {
2144         init_timer(&dum_hcd->timer);
2145         dum_hcd->timer.function = dummy_timer;
2146         dum_hcd->timer.data = (unsigned long)dum_hcd;
2147         dum_hcd->rh_state = DUMMY_RH_RUNNING;
2148         INIT_LIST_HEAD(&dum_hcd->urbp_list);
2149         dummy_hcd_to_hcd(dum_hcd)->power_budget = POWER_BUDGET;
2150         dummy_hcd_to_hcd(dum_hcd)->state = HC_STATE_RUNNING;
2151         dummy_hcd_to_hcd(dum_hcd)->uses_new_polling = 1;
2152 #ifdef CONFIG_USB_OTG
2153         dummy_hcd_to_hcd(dum_hcd)->self.otg_port = 1;
2154 #endif
2155         return 0;
2156
2157         /* FIXME 'urbs' should be a per-device thing, maybe in usbcore */
2158         return device_create_file(dummy_dev(dum_hcd), &dev_attr_urbs);
2159 }
2160
2161 static int dummy_start(struct usb_hcd *hcd)
2162 {
2163         struct dummy_hcd        *dum_hcd = hcd_to_dummy_hcd(hcd);
2164
2165         /*
2166          * MASTER side init ... we emulate a root hub that'll only ever
2167          * talk to one device (the slave side).  Also appears in sysfs,
2168          * just like more familiar pci-based HCDs.
2169          */
2170         if (!usb_hcd_is_primary_hcd(hcd))
2171                 return dummy_start_ss(dum_hcd);
2172
2173         spin_lock_init(&dum_hcd->dum->lock);
2174         init_timer(&dum_hcd->timer);
2175         dum_hcd->timer.function = dummy_timer;
2176         dum_hcd->timer.data = (unsigned long)dum_hcd;
2177         dum_hcd->rh_state = DUMMY_RH_RUNNING;
2178
2179         INIT_LIST_HEAD(&dum_hcd->urbp_list);
2180
2181         hcd->power_budget = POWER_BUDGET;
2182         hcd->state = HC_STATE_RUNNING;
2183         hcd->uses_new_polling = 1;
2184
2185 #ifdef CONFIG_USB_OTG
2186         hcd->self.otg_port = 1;
2187 #endif
2188
2189         /* FIXME 'urbs' should be a per-device thing, maybe in usbcore */
2190         return device_create_file(dummy_dev(dum_hcd), &dev_attr_urbs);
2191 }
2192
2193 static void dummy_stop (struct usb_hcd *hcd)
2194 {
2195         struct dummy            *dum;
2196
2197         dum = (hcd_to_dummy_hcd(hcd))->dum;
2198         device_remove_file(dummy_dev(hcd_to_dummy_hcd(hcd)), &dev_attr_urbs);
2199         usb_gadget_unregister_driver(dum->driver);
2200         dev_info(dummy_dev(hcd_to_dummy_hcd(hcd)), "stopped\n");
2201 }
2202
2203 /*-------------------------------------------------------------------------*/
2204
2205 static int dummy_h_get_frame (struct usb_hcd *hcd)
2206 {
2207         return dummy_g_get_frame (NULL);
2208 }
2209
2210 static int dummy_setup(struct usb_hcd *hcd)
2211 {
2212         if (usb_hcd_is_primary_hcd(hcd)) {
2213                 the_controller.hs_hcd = hcd_to_dummy_hcd(hcd);
2214                 the_controller.hs_hcd->dum = &the_controller;
2215                 /*
2216                  * Mark the first roothub as being USB 2.0.
2217                  * The USB 3.0 roothub will be registered later by
2218                  * dummy_hcd_probe()
2219                  */
2220                 hcd->speed = HCD_USB2;
2221                 hcd->self.root_hub->speed = USB_SPEED_HIGH;
2222         } else {
2223                 the_controller.ss_hcd = hcd_to_dummy_hcd(hcd);
2224                 the_controller.ss_hcd->dum = &the_controller;
2225                 hcd->speed = HCD_USB3;
2226                 hcd->self.root_hub->speed = USB_SPEED_SUPER;
2227         }
2228         return 0;
2229 }
2230
2231 /* Change a group of bulk endpoints to support multiple stream IDs */
2232 int dummy_alloc_streams(struct usb_hcd *hcd, struct usb_device *udev,
2233         struct usb_host_endpoint **eps, unsigned int num_eps,
2234         unsigned int num_streams, gfp_t mem_flags)
2235 {
2236         if (hcd->speed != HCD_USB3)
2237                 dev_dbg(dummy_dev(hcd_to_dummy_hcd(hcd)),
2238                         "%s() - ERROR! Not supported for USB2.0 roothub\n",
2239                         __func__);
2240         return 0;
2241 }
2242
2243 /* Reverts a group of bulk endpoints back to not using stream IDs. */
2244 int dummy_free_streams(struct usb_hcd *hcd, struct usb_device *udev,
2245         struct usb_host_endpoint **eps, unsigned int num_eps,
2246         gfp_t mem_flags)
2247 {
2248         if (hcd->speed != HCD_USB3)
2249                 dev_dbg(dummy_dev(hcd_to_dummy_hcd(hcd)),
2250                         "%s() - ERROR! Not supported for USB2.0 roothub\n",
2251                         __func__);
2252         return 0;
2253 }
2254
2255 static struct hc_driver dummy_hcd = {
2256         .description =          (char *) driver_name,
2257         .product_desc =         "Dummy host controller",
2258         .hcd_priv_size =        sizeof(struct dummy_hcd),
2259
2260         .flags =                HCD_USB3 | HCD_SHARED,
2261
2262         .reset =                dummy_setup,
2263         .start =                dummy_start,
2264         .stop =                 dummy_stop,
2265
2266         .urb_enqueue =          dummy_urb_enqueue,
2267         .urb_dequeue =          dummy_urb_dequeue,
2268
2269         .get_frame_number =     dummy_h_get_frame,
2270
2271         .hub_status_data =      dummy_hub_status,
2272         .hub_control =          dummy_hub_control,
2273         .bus_suspend =          dummy_bus_suspend,
2274         .bus_resume =           dummy_bus_resume,
2275
2276         .alloc_streams =        dummy_alloc_streams,
2277         .free_streams =         dummy_free_streams,
2278 };
2279
2280 static int dummy_hcd_probe(struct platform_device *pdev)
2281 {
2282         struct usb_hcd          *hs_hcd;
2283         struct usb_hcd          *ss_hcd;
2284         int                     retval;
2285
2286         dev_info(&pdev->dev, "%s, driver " DRIVER_VERSION "\n", driver_desc);
2287
2288         if (!mod_data.is_super_speed)
2289                 dummy_hcd.flags = HCD_USB2;
2290         hs_hcd = usb_create_hcd(&dummy_hcd, &pdev->dev, dev_name(&pdev->dev));
2291         if (!hs_hcd)
2292                 return -ENOMEM;
2293         hs_hcd->has_tt = 1;
2294
2295         retval = usb_add_hcd(hs_hcd, 0, 0);
2296         if (retval)
2297                 goto put_usb2_hcd;
2298
2299         if (mod_data.is_super_speed) {
2300                 ss_hcd = usb_create_shared_hcd(&dummy_hcd, &pdev->dev,
2301                                         dev_name(&pdev->dev), hs_hcd);
2302                 if (!ss_hcd) {
2303                         retval = -ENOMEM;
2304                         goto dealloc_usb2_hcd;
2305                 }
2306
2307                 retval = usb_add_hcd(ss_hcd, 0, 0);
2308                 if (retval)
2309                         goto put_usb3_hcd;
2310         }
2311         return 0;
2312
2313 put_usb3_hcd:
2314         usb_put_hcd(ss_hcd);
2315 dealloc_usb2_hcd:
2316         usb_remove_hcd(hs_hcd);
2317 put_usb2_hcd:
2318         usb_put_hcd(hs_hcd);
2319         the_controller.hs_hcd = the_controller.ss_hcd = NULL;
2320         return retval;
2321 }
2322
2323 static int dummy_hcd_remove(struct platform_device *pdev)
2324 {
2325         struct dummy            *dum;
2326
2327         dum = (hcd_to_dummy_hcd(platform_get_drvdata(pdev)))->dum;
2328
2329         if (dum->ss_hcd) {
2330                 usb_remove_hcd(dummy_hcd_to_hcd(dum->ss_hcd));
2331                 usb_put_hcd(dummy_hcd_to_hcd(dum->ss_hcd));
2332         }
2333
2334         usb_remove_hcd(dummy_hcd_to_hcd(dum->hs_hcd));
2335         usb_put_hcd(dummy_hcd_to_hcd(dum->hs_hcd));
2336
2337         the_controller.hs_hcd = NULL;
2338         the_controller.ss_hcd = NULL;
2339
2340         return 0;
2341 }
2342
2343 static int dummy_hcd_suspend (struct platform_device *pdev, pm_message_t state)
2344 {
2345         struct usb_hcd          *hcd;
2346         struct dummy_hcd        *dum_hcd;
2347         int                     rc = 0;
2348
2349         dev_dbg (&pdev->dev, "%s\n", __func__);
2350
2351         hcd = platform_get_drvdata (pdev);
2352         dum_hcd = hcd_to_dummy_hcd(hcd);
2353         if (dum_hcd->rh_state == DUMMY_RH_RUNNING) {
2354                 dev_warn(&pdev->dev, "Root hub isn't suspended!\n");
2355                 rc = -EBUSY;
2356         } else
2357                 clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
2358         return rc;
2359 }
2360
2361 static int dummy_hcd_resume (struct platform_device *pdev)
2362 {
2363         struct usb_hcd          *hcd;
2364
2365         dev_dbg (&pdev->dev, "%s\n", __func__);
2366
2367         hcd = platform_get_drvdata (pdev);
2368         set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
2369         usb_hcd_poll_rh_status (hcd);
2370         return 0;
2371 }
2372
2373 static struct platform_driver dummy_hcd_driver = {
2374         .probe          = dummy_hcd_probe,
2375         .remove         = dummy_hcd_remove,
2376         .suspend        = dummy_hcd_suspend,
2377         .resume         = dummy_hcd_resume,
2378         .driver         = {
2379                 .name   = (char *) driver_name,
2380                 .owner  = THIS_MODULE,
2381         },
2382 };
2383
2384 /*-------------------------------------------------------------------------*/
2385
2386 static struct platform_device *the_udc_pdev;
2387 static struct platform_device *the_hcd_pdev;
2388
2389 static int __init init (void)
2390 {
2391         int     retval = -ENOMEM;
2392
2393         if (usb_disabled ())
2394                 return -ENODEV;
2395
2396         if (!mod_data.is_high_speed && mod_data.is_super_speed)
2397                 return -EINVAL;
2398
2399         the_hcd_pdev = platform_device_alloc(driver_name, -1);
2400         if (!the_hcd_pdev)
2401                 return retval;
2402         the_udc_pdev = platform_device_alloc(gadget_name, -1);
2403         if (!the_udc_pdev)
2404                 goto err_alloc_udc;
2405
2406         retval = platform_driver_register(&dummy_hcd_driver);
2407         if (retval < 0)
2408                 goto err_register_hcd_driver;
2409         retval = platform_driver_register(&dummy_udc_driver);
2410         if (retval < 0)
2411                 goto err_register_udc_driver;
2412
2413         retval = platform_device_add(the_hcd_pdev);
2414         if (retval < 0)
2415                 goto err_add_hcd;
2416         if (!the_controller.hs_hcd ||
2417             (!the_controller.ss_hcd && mod_data.is_super_speed)) {
2418                 /*
2419                  * The hcd was added successfully but its probe function failed
2420                  * for some reason.
2421                  */
2422                 retval = -EINVAL;
2423                 goto err_add_udc;
2424         }
2425         retval = platform_device_add(the_udc_pdev);
2426         if (retval < 0)
2427                 goto err_add_udc;
2428         if (!platform_get_drvdata(the_udc_pdev)) {
2429                 /*
2430                  * The udc was added successfully but its probe function failed
2431                  * for some reason.
2432                  */
2433                 retval = -EINVAL;
2434                 goto err_probe_udc;
2435         }
2436         return retval;
2437
2438 err_probe_udc:
2439         platform_device_del(the_udc_pdev);
2440 err_add_udc:
2441         platform_device_del(the_hcd_pdev);
2442 err_add_hcd:
2443         platform_driver_unregister(&dummy_udc_driver);
2444 err_register_udc_driver:
2445         platform_driver_unregister(&dummy_hcd_driver);
2446 err_register_hcd_driver:
2447         platform_device_put(the_udc_pdev);
2448 err_alloc_udc:
2449         platform_device_put(the_hcd_pdev);
2450         return retval;
2451 }
2452 module_init (init);
2453
2454 static void __exit cleanup (void)
2455 {
2456         platform_device_unregister(the_udc_pdev);
2457         platform_device_unregister(the_hcd_pdev);
2458         platform_driver_unregister(&dummy_udc_driver);
2459         platform_driver_unregister(&dummy_hcd_driver);
2460 }
2461 module_exit (cleanup);