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   1 /*
   2  * dummy_hcd.c -- Dummy/Loopback USB host and device emulator driver.
   3  *
   4  * Maintainer: Alan Stern <stern@rowland.harvard.edu>
   5  *
   6  * Copyright (C) 2003 David Brownell
   7  * Copyright (C) 2003-2005 Alan Stern
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  22  */
  23
  24
  25 /*
  26  * This exposes a device side "USB gadget" API, driven by requests to a
  27  * Linux-USB host controller driver.  USB traffic is simulated; there's
  28  * no need for USB hardware.  Use this with two other drivers:
  29  *
  30  *  - Gadget driver, responding to requests (slave);
  31  *  - Host-side device driver, as already familiar in Linux.
  32  *
  33  * Having this all in one kernel can help some stages of development,
  34  * bypassing some hardware (and driver) issues.  UML could help too.
  35  */
  36
  37 #define DEBUG
  38
  39 #include <linux/config.h>
  40 #include <linux/module.h>
  41 #include <linux/kernel.h>
  42 #include <linux/delay.h>
  43 #include <linux/ioport.h>
  44 #include <linux/sched.h>
  45 #include <linux/slab.h>
  46 #include <linux/smp_lock.h>
  47 #include <linux/errno.h>
  48 #include <linux/init.h>
  49 #include <linux/timer.h>
  50 #include <linux/list.h>
  51 #include <linux/interrupt.h>
  52 #include <linux/version.h>
  53
  54 #include <linux/usb.h>
  55 #include <linux/usb_gadget.h>
  56
  57 #include <asm/byteorder.h>
  58 #include <asm/io.h>
  59 #include <asm/irq.h>
  60 #include <asm/system.h>
  61 #include <asm/unaligned.h>
  62
  63
  64 #include "../core/hcd.h"
  65
  66
  67 #define DRIVER_DESC     "USB Host+Gadget Emulator"
  68 #define DRIVER_VERSION  "17 Dec 2004"
  69
  70 static const char       driver_name [] = "dummy_hcd";
  71 static const char       driver_desc [] = "USB Host+Gadget Emulator";
  72
  73 static const char       gadget_name [] = "dummy_udc";
  74
  75 MODULE_DESCRIPTION (DRIVER_DESC);
  76 MODULE_AUTHOR ("David Brownell");
  77 MODULE_LICENSE ("GPL");
  78
  79 /*-------------------------------------------------------------------------*/
  80
  81 /* gadget side driver data structres */
  82 struct dummy_ep {
  83         struct list_head                queue;
  84         unsigned long                   last_io;        /* jiffies timestamp */
  85         struct usb_gadget               *gadget;
  86         const struct usb_endpoint_descriptor *desc;
  87         struct usb_ep                   ep;
  88         unsigned                        halted : 1;
  89         unsigned                        already_seen : 1;
  90         unsigned                        setup_stage : 1;
  91 };
  92
  93 struct dummy_request {
  94         struct list_head                queue;          /* ep's requests */
  95         struct usb_request              req;
  96 };
  97
  98 static inline struct dummy_ep *usb_ep_to_dummy_ep (struct usb_ep *_ep)
  99 {
 100         return container_of (_ep, struct dummy_ep, ep);
 101 }
 102
 103 static inline struct dummy_request *usb_request_to_dummy_request
 104                 (struct usb_request *_req)
 105 {
 106         return container_of (_req, struct dummy_request, req);
 107 }
 108
 109 /*-------------------------------------------------------------------------*/
 110
 111 /*
 112  * Every device has ep0 for control requests, plus up to 30 more endpoints,
 113  * in one of two types:
 114  *
 115  *   - Configurable:  direction (in/out), type (bulk, iso, etc), and endpoint
 116  *     number can be changed.  Names like "ep-a" are used for this type.
 117  *
 118  *   - Fixed Function:  in other cases.  some characteristics may be mutable;
 119  *     that'd be hardware-specific.  Names like "ep12out-bulk" are used.
 120  *
 121  * Gadget drivers are responsible for not setting up conflicting endpoint
 122  * configurations, illegal or unsupported packet lengths, and so on.
 123  */
 124
 125 static const char ep0name [] = "ep0";
 126
 127 static const char *const ep_name [] = {
 128         ep0name,                                /* everyone has ep0 */
 129
 130         /* act like a net2280: high speed, six configurable endpoints */
 131         "ep-a", "ep-b", "ep-c", "ep-d", "ep-e", "ep-f",
 132
 133         /* or like pxa250: fifteen fixed function endpoints */
 134         "ep1in-bulk", "ep2out-bulk", "ep3in-iso", "ep4out-iso", "ep5in-int",
 135         "ep6in-bulk", "ep7out-bulk", "ep8in-iso", "ep9out-iso", "ep10in-int",
 136         "ep11in-bulk", "ep12out-bulk", "ep13in-iso", "ep14out-iso",
 137                 "ep15in-int",
 138
 139         /* or like sa1100: two fixed function endpoints */
 140         "ep1out-bulk", "ep2in-bulk",
 141 };
 142 #define DUMMY_ENDPOINTS (sizeof(ep_name)/sizeof(char *))
 143
 144 /*-------------------------------------------------------------------------*/
 145
 146 #define FIFO_SIZE               64
 147
 148 struct urbp {
 149         struct urb              *urb;
 150         struct list_head        urbp_list;
 151 };
 152
 153 struct dummy {
 154         spinlock_t                      lock;
 155
 156         /*
 157          * SLAVE/GADGET side support
 158          */
 159         struct dummy_ep                 ep [DUMMY_ENDPOINTS];
 160         int                             address;
 161         struct usb_gadget               gadget;
 162         struct usb_gadget_driver        *driver;
 163         struct dummy_request            fifo_req;
 164         u8                              fifo_buf [FIFO_SIZE];
 165         u16                             devstatus;
 166         unsigned                        pullup:1;
 167         unsigned                        active:1;
 168         unsigned                        old_active:1;
 169
 170         /*
 171          * MASTER/HOST side support
 172          */
 173         struct timer_list               timer;
 174         u32                             port_status;
 175         u32                             old_status;
 176         unsigned                        resuming:1;
 177         unsigned long                   re_timeout;
 178
 179         struct usb_device               *udev;
 180         struct list_head                urbp_list;
 181 };
 182
 183 static inline struct dummy *hcd_to_dummy (struct usb_hcd *hcd)
 184 {
 185         return (struct dummy *) (hcd->hcd_priv);
 186 }
 187
 188 static inline struct usb_hcd *dummy_to_hcd (struct dummy *dum)
 189 {
 190         return container_of((void *) dum, struct usb_hcd, hcd_priv);
 191 }
 192
 193 static inline struct device *dummy_dev (struct dummy *dum)
 194 {
 195         return dummy_to_hcd(dum)->self.controller;
 196 }
 197
 198 static inline struct device *udc_dev (struct dummy *dum)
 199 {
 200         return dum->gadget.dev.parent;
 201 }
 202
 203 static inline struct dummy *ep_to_dummy (struct dummy_ep *ep)
 204 {
 205         return container_of (ep->gadget, struct dummy, gadget);
 206 }
 207
 208 static inline struct dummy *gadget_to_dummy (struct usb_gadget *gadget)
 209 {
 210         return container_of (gadget, struct dummy, gadget);
 211 }
 212
 213 static inline struct dummy *gadget_dev_to_dummy (struct device *dev)
 214 {
 215         return container_of (dev, struct dummy, gadget.dev);
 216 }
 217
 218 static struct dummy                     *the_controller;
 219
 220 /*-------------------------------------------------------------------------*/
 221
 222 /* SLAVE/GADGET SIDE UTILITY ROUTINES */
 223
 224 /* called with spinlock held */
 225 static void nuke (struct dummy *dum, struct dummy_ep *ep)
 226 {
 227         while (!list_empty (&ep->queue)) {
 228                 struct dummy_request    *req;
 229
 230                 req = list_entry (ep->queue.next, struct dummy_request, queue);
 231                 list_del_init (&req->queue);
 232                 req->req.status = -ESHUTDOWN;
 233
 234                 spin_unlock (&dum->lock);
 235                 req->req.complete (&ep->ep, &req->req);
 236                 spin_lock (&dum->lock);
 237         }
 238 }
 239
 240 /* caller must hold lock */
 241 static void
 242 stop_activity (struct dummy *dum)
 243 {
 244         struct dummy_ep *ep;
 245
 246         /* prevent any more requests */
 247         dum->address = 0;
 248
 249         /* The timer is left running so that outstanding URBs can fail */
 250
 251         /* nuke any pending requests first, so driver i/o is quiesced */
 252         list_for_each_entry (ep, &dum->gadget.ep_list, ep.ep_list)
 253                 nuke (dum, ep);
 254
 255         /* driver now does any non-usb quiescing necessary */
 256 }
 257
 258 /* caller must hold lock */
 259 static void
 260 set_link_state (struct dummy *dum)
 261 {
 262         dum->active = 0;
 263         if ((dum->port_status & USB_PORT_STAT_POWER) == 0)
 264                 dum->port_status = 0;
 265         else if (!dum->pullup) {
 266                 dum->port_status &= ~(USB_PORT_STAT_CONNECTION |
 267                                         USB_PORT_STAT_ENABLE |
 268                                         USB_PORT_STAT_LOW_SPEED |
 269                                         USB_PORT_STAT_HIGH_SPEED |
 270                                         USB_PORT_STAT_SUSPEND);
 271                 if ((dum->old_status & USB_PORT_STAT_CONNECTION) != 0)
 272                         dum->port_status |= (USB_PORT_STAT_C_CONNECTION << 16);
 273         } else {
 274                 dum->port_status |= USB_PORT_STAT_CONNECTION;
 275                 if ((dum->old_status & USB_PORT_STAT_CONNECTION) == 0)
 276                         dum->port_status |= (USB_PORT_STAT_C_CONNECTION << 16);
 277                 if ((dum->port_status & USB_PORT_STAT_ENABLE) == 0)
 278                         dum->port_status &= ~USB_PORT_STAT_SUSPEND;
 279                 else if ((dum->port_status & USB_PORT_STAT_SUSPEND) == 0)
 280                         dum->active = 1;
 281         }
 282
 283         if ((dum->port_status & USB_PORT_STAT_ENABLE) == 0 || dum->active)
 284                 dum->resuming = 0;
 285
 286         if ((dum->port_status & USB_PORT_STAT_CONNECTION) == 0 ||
 287                         (dum->port_status & USB_PORT_STAT_RESET) != 0) {
 288                 if ((dum->old_status & USB_PORT_STAT_CONNECTION) != 0 &&
 289                                 (dum->old_status & USB_PORT_STAT_RESET) == 0 &&
 290                                 dum->driver) {
 291                         stop_activity (dum);
 292                         spin_unlock (&dum->lock);
 293                         dum->driver->disconnect (&dum->gadget);
 294                         spin_lock (&dum->lock);
 295                 }
 296         } else if (dum->active != dum->old_active) {
 297                 if (dum->old_active && dum->driver->suspend) {
 298                         spin_unlock (&dum->lock);
 299                         dum->driver->suspend (&dum->gadget);
 300                         spin_lock (&dum->lock);
 301                 } else if (!dum->old_active && dum->driver->resume) {
 302                         spin_unlock (&dum->lock);
 303                         dum->driver->resume (&dum->gadget);
 304                         spin_lock (&dum->lock);
 305                 }
 306         }
 307
 308         dum->old_status = dum->port_status;
 309         dum->old_active = dum->active;
 310 }
 311
 312 /*-------------------------------------------------------------------------*/
 313
 314 /* SLAVE/GADGET SIDE DRIVER
 315  *
 316  * This only tracks gadget state.  All the work is done when the host
 317  * side tries some (emulated) i/o operation.  Real device controller
 318  * drivers would do real i/o using dma, fifos, irqs, timers, etc.
 319  */
 320
 321 #define is_enabled(dum) \
 322         (dum->port_status & USB_PORT_STAT_ENABLE)
 323
 324 static int
 325 dummy_enable (struct usb_ep *_ep, const struct usb_endpoint_descriptor *desc)
 326 {
 327         struct dummy            *dum;
 328         struct dummy_ep         *ep;
 329         unsigned                max;
 330         int                     retval;
 331
 332         ep = usb_ep_to_dummy_ep (_ep);
 333         if (!_ep || !desc || ep->desc || _ep->name == ep0name
 334                         || desc->bDescriptorType != USB_DT_ENDPOINT)
 335                 return -EINVAL;
 336         dum = ep_to_dummy (ep);
 337         if (!dum->driver || !is_enabled (dum))
 338                 return -ESHUTDOWN;
 339         max = le16_to_cpu(desc->wMaxPacketSize) & 0x3ff;
 340
 341         /* drivers must not request bad settings, since lower levels
 342          * (hardware or its drivers) may not check.  some endpoints
 343          * can't do iso, many have maxpacket limitations, etc.
 344          *
 345          * since this "hardware" driver is here to help debugging, we
 346          * have some extra sanity checks.  (there could be more though,
 347          * especially for "ep9out" style fixed function ones.)
 348          */
 349         retval = -EINVAL;
 350         switch (desc->bmAttributes & 0x03) {
 351         case USB_ENDPOINT_XFER_BULK:
 352                 if (strstr (ep->ep.name, "-iso")
 353                                 || strstr (ep->ep.name, "-int")) {
 354                         goto done;
 355                 }
 356                 switch (dum->gadget.speed) {
 357                 case USB_SPEED_HIGH:
 358                         if (max == 512)
 359                                 break;
 360                         /* conserve return statements */
 361                 default:
 362                         switch (max) {
 363                         case 8: case 16: case 32: case 64:
 364                                 /* we'll fake any legal size */
 365                                 break;
 366                         default:
 367                 case USB_SPEED_LOW:
 368                                 goto done;
 369                         }
 370                 }
 371                 break;
 372         case USB_ENDPOINT_XFER_INT:
 373                 if (strstr (ep->ep.name, "-iso")) /* bulk is ok */
 374                         goto done;
 375                 /* real hardware might not handle all packet sizes */
 376                 switch (dum->gadget.speed) {
 377                 case USB_SPEED_HIGH:
 378                         if (max <= 1024)
 379                                 break;
 380                         /* save a return statement */
 381                 case USB_SPEED_FULL:
 382                         if (max <= 64)
 383                                 break;
 384                         /* save a return statement */
 385                 default:
 386                         if (max <= 8)
 387                                 break;
 388                         goto done;
 389                 }
 390                 break;
 391         case USB_ENDPOINT_XFER_ISOC:
 392                 if (strstr (ep->ep.name, "-bulk")
 393                                 || strstr (ep->ep.name, "-int"))
 394                         goto done;
 395                 /* real hardware might not handle all packet sizes */
 396                 switch (dum->gadget.speed) {
 397                 case USB_SPEED_HIGH:
 398                         if (max <= 1024)
 399                                 break;
 400                         /* save a return statement */
 401                 case USB_SPEED_FULL:
 402                         if (max <= 1023)
 403                                 break;
 404                         /* save a return statement */
 405                 default:
 406                         goto done;
 407                 }
 408                 break;
 409         default:
 410                 /* few chips support control except on ep0 */
 411                 goto done;
 412         }
 413
 414         _ep->maxpacket = max;
 415         ep->desc = desc;
 416
 417         dev_dbg (udc_dev(dum), "enabled %s (ep%d%s-%s) maxpacket %d\n",
 418                 _ep->name,
 419                 desc->bEndpointAddress & 0x0f,
 420                 (desc->bEndpointAddress & USB_DIR_IN) ? "in" : "out",
 421                 ({ char *val;
 422                  switch (desc->bmAttributes & 0x03) {
 423                  case USB_ENDPOINT_XFER_BULK: val = "bulk"; break;
 424                  case USB_ENDPOINT_XFER_ISOC: val = "iso"; break;
 425                  case USB_ENDPOINT_XFER_INT: val = "intr"; break;
 426                  default: val = "ctrl"; break;
 427                  }; val; }),
 428                 max);
 429
 430         /* at this point real hardware should be NAKing transfers
 431          * to that endpoint, until a buffer is queued to it.
 432          */
 433         retval = 0;
 434 done:
 435         return retval;
 436 }
 437
 438 static int dummy_disable (struct usb_ep *_ep)
 439 {
 440         struct dummy_ep         *ep;
 441         struct dummy            *dum;
 442         unsigned long           flags;
 443         int                     retval;
 444
 445         ep = usb_ep_to_dummy_ep (_ep);
 446         if (!_ep || !ep->desc || _ep->name == ep0name)
 447                 return -EINVAL;
 448         dum = ep_to_dummy (ep);
 449
 450         spin_lock_irqsave (&dum->lock, flags);
 451         ep->desc = NULL;
 452         retval = 0;
 453         nuke (dum, ep);
 454         spin_unlock_irqrestore (&dum->lock, flags);
 455
 456         dev_dbg (udc_dev(dum), "disabled %s\n", _ep->name);
 457         return retval;
 458 }
 459
 460 static struct usb_request *
 461 dummy_alloc_request (struct usb_ep *_ep, int mem_flags)
 462 {
 463         struct dummy_ep         *ep;
 464         struct dummy_request    *req;
 465
 466         if (!_ep)
 467                 return NULL;
 468         ep = usb_ep_to_dummy_ep (_ep);
 469
 470         req = kmalloc (sizeof *req, mem_flags);
 471         if (!req)
 472                 return NULL;
 473         memset (req, 0, sizeof *req);
 474         INIT_LIST_HEAD (&req->queue);
 475         return &req->req;
 476 }
 477
 478 static void
 479 dummy_free_request (struct usb_ep *_ep, struct usb_request *_req)
 480 {
 481         struct dummy_ep         *ep;
 482         struct dummy_request    *req;
 483
 484         ep = usb_ep_to_dummy_ep (_ep);
 485         if (!ep || !_req || (!ep->desc && _ep->name != ep0name))
 486                 return;
 487
 488         req = usb_request_to_dummy_request (_req);
 489         WARN_ON (!list_empty (&req->queue));
 490         kfree (req);
 491 }
 492
 493 static void *
 494 dummy_alloc_buffer (
 495         struct usb_ep *_ep,
 496         unsigned bytes,
 497         dma_addr_t *dma,
 498         int mem_flags
 499 ) {
 500         char                    *retval;
 501         struct dummy_ep         *ep;
 502         struct dummy            *dum;
 503
 504         ep = usb_ep_to_dummy_ep (_ep);
 505         dum = ep_to_dummy (ep);
 506
 507         if (!dum->driver)
 508                 return NULL;
 509         retval = kmalloc (bytes, mem_flags);
 510         *dma = (dma_addr_t) retval;
 511         return retval;
 512 }
 513
 514 static void
 515 dummy_free_buffer (
 516         struct usb_ep *_ep,
 517         void *buf,
 518         dma_addr_t dma,
 519         unsigned bytes
 520 ) {
 521         if (bytes)
 522                 kfree (buf);
 523 }
 524
 525 static void
 526 fifo_complete (struct usb_ep *ep, struct usb_request *req)
 527 {
 528 }
 529
 530 static int
 531 dummy_queue (struct usb_ep *_ep, struct usb_request *_req, int mem_flags)
 532 {
 533         struct dummy_ep         *ep;
 534         struct dummy_request    *req;
 535         struct dummy            *dum;
 536         unsigned long           flags;
 537
 538         req = usb_request_to_dummy_request (_req);
 539         if (!_req || !list_empty (&req->queue) || !_req->complete)
 540                 return -EINVAL;
 541
 542         ep = usb_ep_to_dummy_ep (_ep);
 543         if (!_ep || (!ep->desc && _ep->name != ep0name))
 544                 return -EINVAL;
 545
 546         dum = ep_to_dummy (ep);
 547         if (!dum->driver || !is_enabled (dum))
 548                 return -ESHUTDOWN;
 549
 550 #if 0
 551         dev_dbg (udc_dev(dum), "ep %p queue req %p to %s, len %d buf %p\n",
 552                         ep, _req, _ep->name, _req->length, _req->buf);
 553 #endif
 554
 555         _req->status = -EINPROGRESS;
 556         _req->actual = 0;
 557         spin_lock_irqsave (&dum->lock, flags);
 558
 559         /* implement an emulated single-request FIFO */
 560         if (ep->desc && (ep->desc->bEndpointAddress & USB_DIR_IN) &&
 561                         list_empty (&dum->fifo_req.queue) &&
 562                         list_empty (&ep->queue) &&
 563                         _req->length <= FIFO_SIZE) {
 564                 req = &dum->fifo_req;
 565                 req->req = *_req;
 566                 req->req.buf = dum->fifo_buf;
 567                 memcpy (dum->fifo_buf, _req->buf, _req->length);
 568                 req->req.context = dum;
 569                 req->req.complete = fifo_complete;
 570
 571                 spin_unlock (&dum->lock);
 572                 _req->actual = _req->length;
 573                 _req->status = 0;
 574                 _req->complete (_ep, _req);
 575                 spin_lock (&dum->lock);
 576         }
 577         list_add_tail (&req->queue, &ep->queue);
 578         spin_unlock_irqrestore (&dum->lock, flags);
 579
 580         /* real hardware would likely enable transfers here, in case
 581          * it'd been left NAKing.
 582          */
 583         return 0;
 584 }
 585
 586 static int dummy_dequeue (struct usb_ep *_ep, struct usb_request *_req)
 587 {
 588         struct dummy_ep         *ep;
 589         struct dummy            *dum;
 590         int                     retval = -EINVAL;
 591         unsigned long           flags;
 592         struct dummy_request    *req = NULL;
 593
 594         if (!_ep || !_req)
 595                 return retval;
 596         ep = usb_ep_to_dummy_ep (_ep);
 597         dum = ep_to_dummy (ep);
 598
 599         if (!dum->driver)
 600                 return -ESHUTDOWN;
 601
 602         spin_lock_irqsave (&dum->lock, flags);
 603         list_for_each_entry (req, &ep->queue, queue) {
 604                 if (&req->req == _req) {
 605                         list_del_init (&req->queue);
 606                         _req->status = -ECONNRESET;
 607                         retval = 0;
 608                         break;
 609                 }
 610         }
 611         spin_unlock_irqrestore (&dum->lock, flags);
 612
 613         if (retval == 0) {
 614                 dev_dbg (udc_dev(dum),
 615                                 "dequeued req %p from %s, len %d buf %p\n",
 616                                 req, _ep->name, _req->length, _req->buf);
 617                 _req->complete (_ep, _req);
 618         }
 619         return retval;
 620 }
 621
 622 static int
 623 dummy_set_halt (struct usb_ep *_ep, int value)
 624 {
 625         struct dummy_ep         *ep;
 626         struct dummy            *dum;
 627
 628         if (!_ep)
 629                 return -EINVAL;
 630         ep = usb_ep_to_dummy_ep (_ep);
 631         dum = ep_to_dummy (ep);
 632         if (!dum->driver)
 633                 return -ESHUTDOWN;
 634         if (!value)
 635                 ep->halted = 0;
 636         else if (ep->desc && (ep->desc->bEndpointAddress & USB_DIR_IN) &&
 637                         !list_empty (&ep->queue))
 638                 return -EAGAIN;
 639         else
 640                 ep->halted = 1;
 641         /* FIXME clear emulated data toggle too */
 642         return 0;
 643 }
 644
 645 static const struct usb_ep_ops dummy_ep_ops = {
 646         .enable         = dummy_enable,
 647         .disable        = dummy_disable,
 648
 649         .alloc_request  = dummy_alloc_request,
 650         .free_request   = dummy_free_request,
 651
 652         .alloc_buffer   = dummy_alloc_buffer,
 653         .free_buffer    = dummy_free_buffer,
 654         /* map, unmap, ... eventually hook the "generic" dma calls */
 655
 656         .queue          = dummy_queue,
 657         .dequeue        = dummy_dequeue,
 658
 659         .set_halt       = dummy_set_halt,
 660 };
 661
 662 /*-------------------------------------------------------------------------*/
 663
 664 /* there are both host and device side versions of this call ... */
 665 static int dummy_g_get_frame (struct usb_gadget *_gadget)
 666 {
 667         struct timeval  tv;
 668
 669         do_gettimeofday (&tv);
 670         return tv.tv_usec / 1000;
 671 }
 672
 673 static int dummy_wakeup (struct usb_gadget *_gadget)
 674 {
 675         struct dummy    *dum;
 676
 677         dum = gadget_to_dummy (_gadget);
 678         if (!(dum->port_status & USB_PORT_STAT_SUSPEND)
 679                         || !(dum->devstatus &
 680                                 ( (1 << USB_DEVICE_B_HNP_ENABLE)
 681                                 | (1 << USB_DEVICE_REMOTE_WAKEUP))))
 682                 return -EINVAL;
 683
 684         /* hub notices our request, issues downstream resume, etc */
 685         dum->resuming = 1;
 686         dum->re_timeout = jiffies + msecs_to_jiffies(20);
 687         return 0;
 688 }
 689
 690 static int dummy_set_selfpowered (struct usb_gadget *_gadget, int value)
 691 {
 692         struct dummy    *dum;
 693
 694         dum = gadget_to_dummy (_gadget);
 695         if (value)
 696                 dum->devstatus |= (1 << USB_DEVICE_SELF_POWERED);
 697         else
 698                 dum->devstatus &= ~(1 << USB_DEVICE_SELF_POWERED);
 699         return 0;
 700 }
 701
 702 static int dummy_pullup (struct usb_gadget *_gadget, int value)
 703 {
 704         struct dummy    *dum;
 705         unsigned long   flags;
 706
 707         dum = gadget_to_dummy (_gadget);
 708         spin_lock_irqsave (&dum->lock, flags);
 709         dum->pullup = (value != 0);
 710         set_link_state (dum);
 711         spin_unlock_irqrestore (&dum->lock, flags);
 712         return 0;
 713 }
 714
 715 static const struct usb_gadget_ops dummy_ops = {
 716         .get_frame      = dummy_g_get_frame,
 717         .wakeup         = dummy_wakeup,
 718         .set_selfpowered = dummy_set_selfpowered,
 719         .pullup         = dummy_pullup,
 720 };
 721
 722 /*-------------------------------------------------------------------------*/
 723
 724 /* "function" sysfs attribute */
 725 static ssize_t
 726 show_function (struct device *dev, struct device_attribute *attr, char *buf)
 727 {
 728         struct dummy    *dum = gadget_dev_to_dummy (dev);
 729
 730         if (!dum->driver || !dum->driver->function)
 731                 return 0;
 732         return scnprintf (buf, PAGE_SIZE, "%s\n", dum->driver->function);
 733 }
 734 DEVICE_ATTR (function, S_IRUGO, show_function, NULL);
 735
 736 /*-------------------------------------------------------------------------*/
 737
 738 /*
 739  * Driver registration/unregistration.
 740  *
 741  * This is basically hardware-specific; there's usually only one real USB
 742  * device (not host) controller since that's how USB devices are intended
 743  * to work.  So most implementations of these api calls will rely on the
 744  * fact that only one driver will ever bind to the hardware.  But curious
 745  * hardware can be built with discrete components, so the gadget API doesn't
 746  * require that assumption.
 747  *
 748  * For this emulator, it might be convenient to create a usb slave device
 749  * for each driver that registers:  just add to a big root hub.
 750  */
 751
 752 int
 753 usb_gadget_register_driver (struct usb_gadget_driver *driver)
 754 {
 755         struct dummy    *dum = the_controller;
 756         int             retval, i;
 757
 758         if (!dum)
 759                 return -EINVAL;
 760         if (dum->driver)
 761                 return -EBUSY;
 762         if (!driver->bind || !driver->unbind || !driver->setup
 763                         || driver->speed == USB_SPEED_UNKNOWN)
 764                 return -EINVAL;
 765
 766         /*
 767          * SLAVE side init ... the layer above hardware, which
 768          * can't enumerate without help from the driver we're binding.
 769          */
 770
 771         dum->devstatus = 0;
 772
 773         INIT_LIST_HEAD (&dum->gadget.ep_list);
 774         for (i = 0; i < DUMMY_ENDPOINTS; i++) {
 775                 struct dummy_ep *ep = &dum->ep [i];
 776
 777                 if (!ep_name [i])
 778                         break;
 779                 ep->ep.name = ep_name [i];
 780                 ep->ep.ops = &dummy_ep_ops;
 781                 list_add_tail (&ep->ep.ep_list, &dum->gadget.ep_list);
 782                 ep->halted = ep->already_seen = ep->setup_stage = 0;
 783                 ep->ep.maxpacket = ~0;
 784                 ep->last_io = jiffies;
 785                 ep->gadget = &dum->gadget;
 786                 ep->desc = NULL;
 787                 INIT_LIST_HEAD (&ep->queue);
 788         }
 789
 790         dum->gadget.ep0 = &dum->ep [0].ep;
 791         dum->ep [0].ep.maxpacket = 64;
 792         list_del_init (&dum->ep [0].ep.ep_list);
 793         INIT_LIST_HEAD(&dum->fifo_req.queue);
 794
 795         dum->driver = driver;
 796         dum->gadget.dev.driver = &driver->driver;
 797         dev_dbg (udc_dev(dum), "binding gadget driver '%s'\n",
 798                         driver->driver.name);
 799         if ((retval = driver->bind (&dum->gadget)) != 0) {
 800                 dum->driver = NULL;
 801                 dum->gadget.dev.driver = NULL;
 802                 return retval;
 803         }
 804
 805         driver->driver.bus = dum->gadget.dev.parent->bus;
 806         driver_register (&driver->driver);
 807         device_bind_driver (&dum->gadget.dev);
 808
 809         /* khubd will enumerate this in a while */
 810         spin_lock_irq (&dum->lock);
 811         dum->pullup = 1;
 812         set_link_state (dum);
 813         spin_unlock_irq (&dum->lock);
 814         return 0;
 815 }
 816 EXPORT_SYMBOL (usb_gadget_register_driver);
 817
 818 int
 819 usb_gadget_unregister_driver (struct usb_gadget_driver *driver)
 820 {
 821         struct dummy    *dum = the_controller;
 822         unsigned long   flags;
 823
 824         if (!dum)
 825                 return -ENODEV;
 826         if (!driver || driver != dum->driver)
 827                 return -EINVAL;
 828
 829         dev_dbg (udc_dev(dum), "unregister gadget driver '%s'\n",
 830                         driver->driver.name);
 831
 832         spin_lock_irqsave (&dum->lock, flags);
 833         dum->pullup = 0;
 834         set_link_state (dum);
 835         spin_unlock_irqrestore (&dum->lock, flags);
 836
 837         driver->unbind (&dum->gadget);
 838         dum->driver = NULL;
 839
 840         device_release_driver (&dum->gadget.dev);
 841         driver_unregister (&driver->driver);
 842
 843         spin_lock_irqsave (&dum->lock, flags);
 844         dum->pullup = 0;
 845         set_link_state (dum);
 846         spin_unlock_irqrestore (&dum->lock, flags);
 847
 848         return 0;
 849 }
 850 EXPORT_SYMBOL (usb_gadget_unregister_driver);
 851
 852 #undef is_enabled
 853
 854 int net2280_set_fifo_mode (struct usb_gadget *gadget, int mode)
 855 {
 856         return -ENOSYS;
 857 }
 858 EXPORT_SYMBOL (net2280_set_fifo_mode);
 859
 860
 861 /* The gadget structure is stored inside the hcd structure and will be
 862  * released along with it. */
 863 static void
 864 dummy_gadget_release (struct device *dev)
 865 {
 866 #if 0           /* usb_bus_put isn't EXPORTed! */
 867         struct dummy    *dum = gadget_dev_to_dummy (dev);
 868
 869         usb_bus_put (&dummy_to_hcd (dum)->self);
 870 #endif
 871 }
 872
 873 static int dummy_udc_probe (struct device *dev)
 874 {
 875         struct dummy    *dum = the_controller;
 876         int             rc;
 877
 878         dum->gadget.name = gadget_name;
 879         dum->gadget.ops = &dummy_ops;
 880         dum->gadget.is_dualspeed = 1;
 881
 882         /* maybe claim OTG support, though we won't complete HNP */
 883         dum->gadget.is_otg = (dummy_to_hcd(dum)->self.otg_port != 0);
 884
 885         strcpy (dum->gadget.dev.bus_id, "gadget");
 886         dum->gadget.dev.parent = dev;
 887         dum->gadget.dev.release = dummy_gadget_release;
 888         rc = device_register (&dum->gadget.dev);
 889         if (rc < 0)
 890                 return rc;
 891
 892 #if 0           /* usb_bus_get isn't EXPORTed! */
 893         usb_bus_get (&dummy_to_hcd (dum)->self);
 894 #endif
 895
 896         dev_set_drvdata (dev, dum);
 897         device_create_file (&dum->gadget.dev, &dev_attr_function);
 898         return rc;
 899 }
 900
 901 static int dummy_udc_remove (struct device *dev)
 902 {
 903         struct dummy    *dum = dev_get_drvdata (dev);
 904
 905         dev_set_drvdata (dev, NULL);
 906         device_remove_file (&dum->gadget.dev, &dev_attr_function);
 907         device_unregister (&dum->gadget.dev);
 908         return 0;
 909 }
 910
 911 static struct device_driver dummy_udc_driver = {
 912         .name           = (char *) gadget_name,
 913         .bus            = &platform_bus_type,
 914         .probe          = dummy_udc_probe,
 915         .remove         = dummy_udc_remove,
 916 };
 917
 918 /*-------------------------------------------------------------------------*/
 919
 920 /* MASTER/HOST SIDE DRIVER
 921  *
 922  * this uses the hcd framework to hook up to host side drivers.
 923  * its root hub will only have one device, otherwise it acts like
 924  * a normal host controller.
 925  *
 926  * when urbs are queued, they're just stuck on a list that we
 927  * scan in a timer callback.  that callback connects writes from
 928  * the host with reads from the device, and so on, based on the
 929  * usb 2.0 rules.
 930  */
 931
 932 static int dummy_urb_enqueue (
 933         struct usb_hcd                  *hcd,
 934         struct usb_host_endpoint        *ep,
 935         struct urb                      *urb,
 936         int                             mem_flags
 937 ) {
 938         struct dummy    *dum;
 939         struct urbp     *urbp;
 940         unsigned long   flags;
 941
 942         if (!urb->transfer_buffer && urb->transfer_buffer_length)
 943                 return -EINVAL;
 944
 945         urbp = kmalloc (sizeof *urbp, mem_flags);
 946         if (!urbp)
 947                 return -ENOMEM;
 948         urbp->urb = urb;
 949
 950         dum = hcd_to_dummy (hcd);
 951         spin_lock_irqsave (&dum->lock, flags);
 952
 953         if (!dum->udev) {
 954                 dum->udev = urb->dev;
 955                 usb_get_dev (dum->udev);
 956         } else if (unlikely (dum->udev != urb->dev))
 957                 dev_err (dummy_dev(dum), "usb_device address has changed!\n");
 958
 959         list_add_tail (&urbp->urbp_list, &dum->urbp_list);
 960         urb->hcpriv = urbp;
 961         if (usb_pipetype (urb->pipe) == PIPE_CONTROL)
 962                 urb->error_count = 1;           /* mark as a new urb */
 963
 964         /* kick the scheduler, it'll do the rest */
 965         if (!timer_pending (&dum->timer))
 966                 mod_timer (&dum->timer, jiffies + 1);
 967
 968         spin_unlock_irqrestore (&dum->lock, flags);
 969         return 0;
 970 }
 971
 972 static int dummy_urb_dequeue (struct usb_hcd *hcd, struct urb *urb)
 973 {
 974         /* giveback happens automatically in timer callback */
 975         return 0;
 976 }
 977
 978 static void maybe_set_status (struct urb *urb, int status)
 979 {
 980         spin_lock (&urb->lock);
 981         if (urb->status == -EINPROGRESS)
 982                 urb->status = status;
 983         spin_unlock (&urb->lock);
 984 }
 985
 986 /* transfer up to a frame's worth; caller must own lock */
 987 static int
 988 transfer (struct dummy *dum, struct urb *urb, struct dummy_ep *ep, int limit)
 989 {
 990         struct dummy_request    *req;
 991
 992 top:
 993         /* if there's no request queued, the device is NAKing; return */
 994         list_for_each_entry (req, &ep->queue, queue) {
 995                 unsigned        host_len, dev_len, len;
 996                 int             is_short, to_host;
 997                 int             rescan = 0;
 998
 999                 /* 1..N packets of ep->ep.maxpacket each ... the last one
1000                  * may be short (including zero length).
1001                  *
1002                  * writer can send a zlp explicitly (length 0) or implicitly
1003                  * (length mod maxpacket zero, and 'zero' flag); they always
1004                  * terminate reads.
1005                  */
1006                 host_len = urb->transfer_buffer_length - urb->actual_length;
1007                 dev_len = req->req.length - req->req.actual;
1008                 len = min (host_len, dev_len);
1009
1010                 /* FIXME update emulated data toggle too */
1011
1012                 to_host = usb_pipein (urb->pipe);
1013                 if (unlikely (len == 0))
1014                         is_short = 1;
1015                 else {
1016                         char            *ubuf, *rbuf;
1017
1018                         /* not enough bandwidth left? */
1019                         if (limit < ep->ep.maxpacket && limit < len)
1020                                 break;
1021                         len = min (len, (unsigned) limit);
1022                         if (len == 0)
1023                                 break;
1024
1025                         /* use an extra pass for the final short packet */
1026                         if (len > ep->ep.maxpacket) {
1027                                 rescan = 1;
1028                                 len -= (len % ep->ep.maxpacket);
1029                         }
1030                         is_short = (len % ep->ep.maxpacket) != 0;
1031
1032                         /* else transfer packet(s) */
1033                         ubuf = urb->transfer_buffer + urb->actual_length;
1034                         rbuf = req->req.buf + req->req.actual;
1035                         if (to_host)
1036                                 memcpy (ubuf, rbuf, len);
1037                         else
1038                                 memcpy (rbuf, ubuf, len);
1039                         ep->last_io = jiffies;
1040
1041                         limit -= len;
1042                         urb->actual_length += len;
1043                         req->req.actual += len;
1044                 }
1045
1046                 /* short packets terminate, maybe with overflow/underflow.
1047                  * it's only really an error to write too much.
1048                  *
1049                  * partially filling a buffer optionally blocks queue advances
1050                  * (so completion handlers can clean up the queue) but we don't
1051                  * need to emulate such data-in-flight.  so we only show part
1052                  * of the URB_SHORT_NOT_OK effect: completion status.
1053                  */
1054                 if (is_short) {
1055                         if (host_len == dev_len) {
1056                                 req->req.status = 0;
1057                                 maybe_set_status (urb, 0);
1058                         } else if (to_host) {
1059                                 req->req.status = 0;
1060                                 if (dev_len > host_len)
1061                                         maybe_set_status (urb, -EOVERFLOW);
1062                                 else
1063                                         maybe_set_status (urb,
1064                                                 (urb->transfer_flags
1065                                                         & URB_SHORT_NOT_OK)
1066                                                 ? -EREMOTEIO : 0);
1067                         } else if (!to_host) {
1068                                 maybe_set_status (urb, 0);
1069                                 if (host_len > dev_len)
1070                                         req->req.status = -EOVERFLOW;
1071                                 else
1072                                         req->req.status = 0;
1073                         }
1074
1075                 /* many requests terminate without a short packet */
1076                 } else {
1077                         if (req->req.length == req->req.actual
1078                                         && !req->req.zero)
1079                                 req->req.status = 0;
1080                         if (urb->transfer_buffer_length == urb->actual_length
1081                                         && !(urb->transfer_flags
1082                                                 & URB_ZERO_PACKET)) {
1083                                 maybe_set_status (urb, 0);
1084                         }
1085                 }
1086
1087                 /* device side completion --> continuable */
1088                 if (req->req.status != -EINPROGRESS) {
1089                         list_del_init (&req->queue);
1090
1091                         spin_unlock (&dum->lock);
1092                         req->req.complete (&ep->ep, &req->req);
1093                         spin_lock (&dum->lock);
1094
1095                         /* requests might have been unlinked... */
1096                         rescan = 1;
1097                 }
1098
1099                 /* host side completion --> terminate */
1100                 if (urb->status != -EINPROGRESS)
1101                         break;
1102
1103                 /* rescan to continue with any other queued i/o */
1104                 if (rescan)
1105                         goto top;
1106         }
1107         return limit;
1108 }
1109
1110 static int periodic_bytes (struct dummy *dum, struct dummy_ep *ep)
1111 {
1112         int     limit = ep->ep.maxpacket;
1113
1114         if (dum->gadget.speed == USB_SPEED_HIGH) {
1115                 int     tmp;
1116
1117                 /* high bandwidth mode */
1118                 tmp = le16_to_cpu(ep->desc->wMaxPacketSize);
1119                 tmp = le16_to_cpu (tmp);
1120                 tmp = (tmp >> 11) & 0x03;
1121                 tmp *= 8 /* applies to entire frame */;
1122                 limit += limit * tmp;
1123         }
1124         return limit;
1125 }
1126
1127 #define is_active(dum)  ((dum->port_status & \
1128                 (USB_PORT_STAT_CONNECTION | USB_PORT_STAT_ENABLE | \
1129                         USB_PORT_STAT_SUSPEND)) \
1130                 == (USB_PORT_STAT_CONNECTION | USB_PORT_STAT_ENABLE))
1131
1132 static struct dummy_ep *find_endpoint (struct dummy *dum, u8 address)
1133 {
1134         int             i;
1135
1136         if (!is_active (dum))
1137                 return NULL;
1138         if ((address & ~USB_DIR_IN) == 0)
1139                 return &dum->ep [0];
1140         for (i = 1; i < DUMMY_ENDPOINTS; i++) {
1141                 struct dummy_ep *ep = &dum->ep [i];
1142
1143                 if (!ep->desc)
1144                         continue;
1145                 if (ep->desc->bEndpointAddress == address)
1146                         return ep;
1147         }
1148         return NULL;
1149 }
1150
1151 #undef is_active
1152
1153 #define Dev_Request     (USB_TYPE_STANDARD | USB_RECIP_DEVICE)
1154 #define Dev_InRequest   (Dev_Request | USB_DIR_IN)
1155 #define Intf_Request    (USB_TYPE_STANDARD | USB_RECIP_INTERFACE)
1156 #define Intf_InRequest  (Intf_Request | USB_DIR_IN)
1157 #define Ep_Request      (USB_TYPE_STANDARD | USB_RECIP_ENDPOINT)
1158 #define Ep_InRequest    (Ep_Request | USB_DIR_IN)
1159
1160 /* drive both sides of the transfers; looks like irq handlers to
1161  * both drivers except the callbacks aren't in_irq().
1162  */
1163 static void dummy_timer (unsigned long _dum)
1164 {
1165         struct dummy            *dum = (struct dummy *) _dum;
1166         struct urbp             *urbp, *tmp;
1167         unsigned long           flags;
1168         int                     limit, total;
1169         int                     i;
1170
1171         /* simplistic model for one frame's bandwidth */
1172         switch (dum->gadget.speed) {
1173         case USB_SPEED_LOW:
1174                 total = 8/*bytes*/ * 12/*packets*/;
1175                 break;
1176         case USB_SPEED_FULL:
1177                 total = 64/*bytes*/ * 19/*packets*/;
1178                 break;
1179         case USB_SPEED_HIGH:
1180                 total = 512/*bytes*/ * 13/*packets*/ * 8/*uframes*/;
1181                 break;
1182         default:
1183                 dev_err (dummy_dev(dum), "bogus device speed\n");
1184                 return;
1185         }
1186
1187         /* FIXME if HZ != 1000 this will probably misbehave ... */
1188
1189         /* look at each urb queued by the host side driver */
1190         spin_lock_irqsave (&dum->lock, flags);
1191
1192         if (!dum->udev) {
1193                 dev_err (dummy_dev(dum),
1194                                 "timer fired with no URBs pending?\n");
1195                 spin_unlock_irqrestore (&dum->lock, flags);
1196                 return;
1197         }
1198
1199         for (i = 0; i < DUMMY_ENDPOINTS; i++) {
1200                 if (!ep_name [i])
1201                         break;
1202                 dum->ep [i].already_seen = 0;
1203         }
1204
1205 restart:
1206         list_for_each_entry_safe (urbp, tmp, &dum->urbp_list, urbp_list) {
1207                 struct urb              *urb;
1208                 struct dummy_request    *req;
1209                 u8                      address;
1210                 struct dummy_ep         *ep = NULL;
1211                 int                     type;
1212
1213                 urb = urbp->urb;
1214                 if (urb->status != -EINPROGRESS) {
1215                         /* likely it was just unlinked */
1216                         goto return_urb;
1217                 }
1218                 type = usb_pipetype (urb->pipe);
1219
1220                 /* used up this frame's non-periodic bandwidth?
1221                  * FIXME there's infinite bandwidth for control and
1222                  * periodic transfers ... unrealistic.
1223                  */
1224                 if (total <= 0 && type == PIPE_BULK)
1225                         continue;
1226
1227                 /* find the gadget's ep for this request (if configured) */
1228                 address = usb_pipeendpoint (urb->pipe);
1229                 if (usb_pipein (urb->pipe))
1230                         address |= USB_DIR_IN;
1231                 ep = find_endpoint(dum, address);
1232                 if (!ep) {
1233                         /* set_configuration() disagreement */
1234                         dev_dbg (dummy_dev(dum),
1235                                 "no ep configured for urb %p\n",
1236                                 urb);
1237                         maybe_set_status (urb, -EPROTO);
1238                         goto return_urb;
1239                 }
1240
1241                 if (ep->already_seen)
1242                         continue;
1243                 ep->already_seen = 1;
1244                 if (ep == &dum->ep [0] && urb->error_count) {
1245                         ep->setup_stage = 1;    /* a new urb */
1246                         urb->error_count = 0;
1247                 }
1248                 if (ep->halted && !ep->setup_stage) {
1249                         /* NOTE: must not be iso! */
1250                         dev_dbg (dummy_dev(dum), "ep %s halted, urb %p\n",
1251                                         ep->ep.name, urb);
1252                         maybe_set_status (urb, -EPIPE);
1253                         goto return_urb;
1254                 }
1255                 /* FIXME make sure both ends agree on maxpacket */
1256
1257                 /* handle control requests */
1258                 if (ep == &dum->ep [0] && ep->setup_stage) {
1259                         struct usb_ctrlrequest          setup;
1260                         int                             value = 1;
1261                         struct dummy_ep                 *ep2;
1262
1263                         setup = *(struct usb_ctrlrequest*) urb->setup_packet;
1264                         le16_to_cpus (&setup.wIndex);
1265                         le16_to_cpus (&setup.wValue);
1266                         le16_to_cpus (&setup.wLength);
1267                         if (setup.wLength != urb->transfer_buffer_length) {
1268                                 maybe_set_status (urb, -EOVERFLOW);
1269                                 goto return_urb;
1270                         }
1271
1272                         /* paranoia, in case of stale queued data */
1273                         list_for_each_entry (req, &ep->queue, queue) {
1274                                 list_del_init (&req->queue);
1275                                 req->req.status = -EOVERFLOW;
1276                                 dev_dbg (udc_dev(dum), "stale req = %p\n",
1277                                                 req);
1278
1279                                 spin_unlock (&dum->lock);
1280                                 req->req.complete (&ep->ep, &req->req);
1281                                 spin_lock (&dum->lock);
1282                                 ep->already_seen = 0;
1283                                 goto restart;
1284                         }
1285
1286                         /* gadget driver never sees set_address or operations
1287                          * on standard feature flags.  some hardware doesn't
1288                          * even expose them.
1289                          */
1290                         ep->last_io = jiffies;
1291                         ep->setup_stage = 0;
1292                         ep->halted = 0;
1293                         switch (setup.bRequest) {
1294                         case USB_REQ_SET_ADDRESS:
1295                                 if (setup.bRequestType != Dev_Request)
1296                                         break;
1297                                 dum->address = setup.wValue;
1298                                 maybe_set_status (urb, 0);
1299                                 dev_dbg (udc_dev(dum), "set_address = %d\n",
1300                                                 setup.wValue);
1301                                 value = 0;
1302                                 break;
1303                         case USB_REQ_SET_FEATURE:
1304                                 if (setup.bRequestType == Dev_Request) {
1305                                         value = 0;
1306                                         switch (setup.wValue) {
1307                                         case USB_DEVICE_REMOTE_WAKEUP:
1308                                                 break;
1309                                         case USB_DEVICE_B_HNP_ENABLE:
1310                                                 dum->gadget.b_hnp_enable = 1;
1311                                                 break;
1312                                         case USB_DEVICE_A_HNP_SUPPORT:
1313                                                 dum->gadget.a_hnp_support = 1;
1314                                                 break;
1315                                         case USB_DEVICE_A_ALT_HNP_SUPPORT:
1316                                                 dum->gadget.a_alt_hnp_support
1317                                                         = 1;
1318                                                 break;
1319                                         default:
1320                                                 value = -EOPNOTSUPP;
1321                                         }
1322                                         if (value == 0) {
1323                                                 dum->devstatus |=
1324                                                         (1 << setup.wValue);
1325                                                 maybe_set_status (urb, 0);
1326                                         }
1327
1328                                 } else if (setup.bRequestType == Ep_Request) {
1329                                         // endpoint halt
1330                                         ep2 = find_endpoint (dum,
1331                                                         setup.wIndex);
1332                                         if (!ep2) {
1333                                                 value = -EOPNOTSUPP;
1334                                                 break;
1335                                         }
1336                                         ep2->halted = 1;
1337                                         value = 0;
1338                                         maybe_set_status (urb, 0);
1339                                 }
1340                                 break;
1341                         case USB_REQ_CLEAR_FEATURE:
1342                                 if (setup.bRequestType == Dev_Request) {
1343                                         switch (setup.wValue) {
1344                                         case USB_DEVICE_REMOTE_WAKEUP:
1345                                                 dum->devstatus &= ~(1 <<
1346                                                         USB_DEVICE_REMOTE_WAKEUP);
1347                                                 value = 0;
1348                                                 maybe_set_status (urb, 0);
1349                                                 break;
1350                                         default:
1351                                                 value = -EOPNOTSUPP;
1352                                                 break;
1353                                         }
1354                                 } else if (setup.bRequestType == Ep_Request) {
1355                                         // endpoint halt
1356                                         ep2 = find_endpoint (dum,
1357                                                         setup.wIndex);
1358                                         if (!ep2) {
1359                                                 value = -EOPNOTSUPP;
1360                                                 break;
1361                                         }
1362                                         ep2->halted = 0;
1363                                         value = 0;
1364                                         maybe_set_status (urb, 0);
1365                                 }
1366                                 break;
1367                         case USB_REQ_GET_STATUS:
1368                                 if (setup.bRequestType == Dev_InRequest
1369                                                 || setup.bRequestType
1370                                                         == Intf_InRequest
1371                                                 || setup.bRequestType
1372                                                         == Ep_InRequest
1373                                                 ) {
1374                                         char *buf;
1375
1376                                         // device: remote wakeup, selfpowered
1377                                         // interface: nothing
1378                                         // endpoint: halt
1379                                         buf = (char *)urb->transfer_buffer;
1380                                         if (urb->transfer_buffer_length > 0) {
1381                                                 if (setup.bRequestType ==
1382                                                                 Ep_InRequest) {
1383         ep2 = find_endpoint (dum, setup.wIndex);
1384         if (!ep2) {
1385                 value = -EOPNOTSUPP;
1386                 break;
1387         }
1388         buf [0] = ep2->halted;
1389                                                 } else if (setup.bRequestType ==
1390                                                                 Dev_InRequest) {
1391                                                         buf [0] = (u8)
1392                                                                 dum->devstatus;
1393                                                 } else
1394                                                         buf [0] = 0;
1395                                         }
1396                                         if (urb->transfer_buffer_length > 1)
1397                                                 buf [1] = 0;
1398                                         urb->actual_length = min (2,
1399                                                 urb->transfer_buffer_length);
1400                                         value = 0;
1401                                         maybe_set_status (urb, 0);
1402                                 }
1403                                 break;
1404                         }
1405
1406                         /* gadget driver handles all other requests.  block
1407                          * until setup() returns; no reentrancy issues etc.
1408                          */
1409                         if (value > 0) {
1410                                 spin_unlock (&dum->lock);
1411                                 value = dum->driver->setup (&dum->gadget,
1412                                                 &setup);
1413                                 spin_lock (&dum->lock);
1414
1415                                 if (value >= 0) {
1416                                         /* no delays (max 64KB data stage) */
1417                                         limit = 64*1024;
1418                                         goto treat_control_like_bulk;
1419                                 }
1420                                 /* error, see below */
1421                         }
1422
1423                         if (value < 0) {
1424                                 if (value != -EOPNOTSUPP)
1425                                         dev_dbg (udc_dev(dum),
1426                                                 "setup --> %d\n",
1427                                                 value);
1428                                 maybe_set_status (urb, -EPIPE);
1429                                 urb->actual_length = 0;
1430                         }
1431
1432                         goto return_urb;
1433                 }
1434
1435                 /* non-control requests */
1436                 limit = total;
1437                 switch (usb_pipetype (urb->pipe)) {
1438                 case PIPE_ISOCHRONOUS:
1439                         /* FIXME is it urb->interval since the last xfer?
1440                          * use urb->iso_frame_desc[i].
1441                          * complete whether or not ep has requests queued.
1442                          * report random errors, to debug drivers.
1443                          */
1444                         limit = max (limit, periodic_bytes (dum, ep));
1445                         maybe_set_status (urb, -ENOSYS);
1446                         break;
1447
1448                 case PIPE_INTERRUPT:
1449                         /* FIXME is it urb->interval since the last xfer?
1450                          * this almost certainly polls too fast.
1451                          */
1452                         limit = max (limit, periodic_bytes (dum, ep));
1453                         /* FALLTHROUGH */
1454
1455                 // case PIPE_BULK:  case PIPE_CONTROL:
1456                 default:
1457                 treat_control_like_bulk:
1458                         ep->last_io = jiffies;
1459                         total = transfer (dum, urb, ep, limit);
1460                         break;
1461                 }
1462
1463                 /* incomplete transfer? */
1464                 if (urb->status == -EINPROGRESS)
1465                         continue;
1466
1467 return_urb:
1468                 urb->hcpriv = NULL;
1469                 list_del (&urbp->urbp_list);
1470                 kfree (urbp);
1471                 if (ep)
1472                         ep->already_seen = ep->setup_stage = 0;
1473
1474                 spin_unlock (&dum->lock);
1475                 usb_hcd_giveback_urb (dummy_to_hcd(dum), urb, NULL);
1476                 spin_lock (&dum->lock);
1477
1478                 goto restart;
1479         }
1480
1481         /* want a 1 msec delay here */
1482         if (!list_empty (&dum->urbp_list))
1483                 mod_timer (&dum->timer, jiffies + msecs_to_jiffies(1));
1484         else {
1485                 usb_put_dev (dum->udev);
1486                 dum->udev = NULL;
1487         }
1488
1489         spin_unlock_irqrestore (&dum->lock, flags);
1490 }
1491
1492 /*-------------------------------------------------------------------------*/
1493
1494 #define PORT_C_MASK \
1495         ((USB_PORT_STAT_C_CONNECTION \
1496         | USB_PORT_STAT_C_ENABLE \
1497         | USB_PORT_STAT_C_SUSPEND \
1498         | USB_PORT_STAT_C_OVERCURRENT \
1499         | USB_PORT_STAT_C_RESET) << 16)
1500
1501 static int dummy_hub_status (struct usb_hcd *hcd, char *buf)
1502 {
1503         struct dummy            *dum;
1504         unsigned long           flags;
1505         int                     retval;
1506
1507         dum = hcd_to_dummy (hcd);
1508
1509         spin_lock_irqsave (&dum->lock, flags);
1510
1511         if (dum->resuming && time_after_eq (jiffies, dum->re_timeout)) {
1512                 dum->port_status |= (USB_PORT_STAT_C_SUSPEND << 16);
1513                 dum->port_status &= ~USB_PORT_STAT_SUSPEND;
1514                 set_link_state (dum);
1515         }
1516
1517         if (!(dum->port_status & PORT_C_MASK))
1518                 retval = 0;
1519         else {
1520                 *buf = (1 << 1);
1521                 dev_dbg (dummy_dev(dum), "port status 0x%08x has changes\n",
1522                         dum->port_status);
1523                 retval = 1;
1524         }
1525         spin_unlock_irqrestore (&dum->lock, flags);
1526         return retval;
1527 }
1528
1529 static inline void
1530 hub_descriptor (struct usb_hub_descriptor *desc)
1531 {
1532         memset (desc, 0, sizeof *desc);
1533         desc->bDescriptorType = 0x29;
1534         desc->bDescLength = 9;
1535         desc->wHubCharacteristics = __constant_cpu_to_le16 (0x0001);
1536         desc->bNbrPorts = 1;
1537         desc->bitmap [0] = 0xff;
1538         desc->bitmap [1] = 0xff;
1539 }
1540
1541 static int dummy_hub_control (
1542         struct usb_hcd  *hcd,
1543         u16             typeReq,
1544         u16             wValue,
1545         u16             wIndex,
1546         char            *buf,
1547         u16             wLength
1548 ) {
1549         struct dummy    *dum;
1550         int             retval = 0;
1551         unsigned long   flags;
1552
1553         dum = hcd_to_dummy (hcd);
1554         spin_lock_irqsave (&dum->lock, flags);
1555         switch (typeReq) {
1556         case ClearHubFeature:
1557                 break;
1558         case ClearPortFeature:
1559                 switch (wValue) {
1560                 case USB_PORT_FEAT_SUSPEND:
1561                         if (dum->port_status & USB_PORT_STAT_SUSPEND) {
1562                                 /* 20msec resume signaling */
1563                                 dum->resuming = 1;
1564                                 dum->re_timeout = jiffies +
1565                                                 msecs_to_jiffies(20);
1566                         }
1567                         break;
1568                 case USB_PORT_FEAT_POWER:
1569                         if (dum->port_status & USB_PORT_STAT_POWER)
1570                                 dev_dbg (dummy_dev(dum), "power-off\n");
1571                         /* FALLS THROUGH */
1572                 default:
1573                         dum->port_status &= ~(1 << wValue);
1574                         set_link_state (dum);
1575                 }
1576                 break;
1577         case GetHubDescriptor:
1578                 hub_descriptor ((struct usb_hub_descriptor *) buf);
1579                 break;
1580         case GetHubStatus:
1581                 *(u32 *) buf = __constant_cpu_to_le32 (0);
1582                 break;
1583         case GetPortStatus:
1584                 if (wIndex != 1)
1585                         retval = -EPIPE;
1586
1587                 /* whoever resets or resumes must GetPortStatus to
1588                  * complete it!!
1589                  */
1590                 if (dum->resuming &&
1591                                 time_after_eq (jiffies, dum->re_timeout)) {
1592                         dum->port_status |= (USB_PORT_STAT_C_SUSPEND << 16);
1593                         dum->port_status &= ~USB_PORT_STAT_SUSPEND;
1594                 }
1595                 if ((dum->port_status & USB_PORT_STAT_RESET) != 0 &&
1596                                 time_after_eq (jiffies, dum->re_timeout)) {
1597                         dum->port_status |= (USB_PORT_STAT_C_RESET << 16);
1598                         dum->port_status &= ~USB_PORT_STAT_RESET;
1599                         if (dum->pullup) {
1600                                 dum->port_status |= USB_PORT_STAT_ENABLE;
1601                                 /* give it the best speed we agree on */
1602                                 dum->gadget.speed = dum->driver->speed;
1603                                 dum->gadget.ep0->maxpacket = 64;
1604                                 switch (dum->gadget.speed) {
1605                                 case USB_SPEED_HIGH:
1606                                         dum->port_status |=
1607                                                 USB_PORT_STAT_HIGH_SPEED;
1608                                         break;
1609                                 case USB_SPEED_LOW:
1610                                         dum->gadget.ep0->maxpacket = 8;
1611                                         dum->port_status |=
1612                                                 USB_PORT_STAT_LOW_SPEED;
1613                                         break;
1614                                 default:
1615                                         dum->gadget.speed = USB_SPEED_FULL;
1616                                         break;
1617                                 }
1618                         }
1619                 }
1620                 set_link_state (dum);
1621                 ((u16 *) buf)[0] = cpu_to_le16 (dum->port_status);
1622                 ((u16 *) buf)[1] = cpu_to_le16 (dum->port_status >> 16);
1623                 break;
1624         case SetHubFeature:
1625                 retval = -EPIPE;
1626                 break;
1627         case SetPortFeature:
1628                 switch (wValue) {
1629                 case USB_PORT_FEAT_SUSPEND:
1630                         if (dum->active) {
1631                                 dum->port_status |= USB_PORT_STAT_SUSPEND;
1632
1633                                 /* HNP would happen here; for now we
1634                                  * assume b_bus_req is always true.
1635                                  */
1636                                 set_link_state (dum);
1637                                 if (((1 << USB_DEVICE_B_HNP_ENABLE)
1638                                                 & dum->devstatus) != 0)
1639                                         dev_dbg (dummy_dev(dum),
1640                                                         "no HNP yet!\n");
1641                         }
1642                         break;
1643                 case USB_PORT_FEAT_POWER:
1644                         dum->port_status |= USB_PORT_STAT_POWER;
1645                         set_link_state (dum);
1646                         break;
1647                 case USB_PORT_FEAT_RESET:
1648                         /* if it's already enabled, disable */
1649                         dum->port_status &= ~(USB_PORT_STAT_ENABLE
1650                                         | USB_PORT_STAT_LOW_SPEED
1651                                         | USB_PORT_STAT_HIGH_SPEED);
1652                         /* 50msec reset signaling */
1653                         dum->re_timeout = jiffies + msecs_to_jiffies(50);
1654                         /* FALLS THROUGH */
1655                 default:
1656                         if ((dum->port_status & USB_PORT_STAT_POWER) != 0) {
1657                                 dum->port_status |= (1 << wValue);
1658                                 set_link_state (dum);
1659                         }
1660                 }
1661                 break;
1662
1663         default:
1664                 dev_dbg (dummy_dev(dum),
1665                         "hub control req%04x v%04x i%04x l%d\n",
1666                         typeReq, wValue, wIndex, wLength);
1667
1668                 /* "protocol stall" on error */
1669                 retval = -EPIPE;
1670         }
1671         spin_unlock_irqrestore (&dum->lock, flags);
1672         return retval;
1673 }
1674
1675
1676 /*-------------------------------------------------------------------------*/
1677
1678 static inline ssize_t
1679 show_urb (char *buf, size_t size, struct urb *urb)
1680 {
1681         int ep = usb_pipeendpoint (urb->pipe);
1682
1683         return snprintf (buf, size,
1684                 "urb/%p %s ep%d%s%s len %d/%d\n",
1685                 urb,
1686                 ({ char *s;
1687                  switch (urb->dev->speed) {
1688                  case USB_SPEED_LOW:    s = "ls"; break;
1689                  case USB_SPEED_FULL:   s = "fs"; break;
1690                  case USB_SPEED_HIGH:   s = "hs"; break;
1691                  default:               s = "?"; break;
1692                  }; s; }),
1693                 ep, ep ? (usb_pipein (urb->pipe) ? "in" : "out") : "",
1694                 ({ char *s; \
1695                  switch (usb_pipetype (urb->pipe)) { \
1696                  case PIPE_CONTROL:     s = ""; break; \
1697                  case PIPE_BULK:        s = "-bulk"; break; \
1698                  case PIPE_INTERRUPT:   s = "-int"; break; \
1699                  default:               s = "-iso"; break; \
1700                 }; s;}),
1701                 urb->actual_length, urb->transfer_buffer_length);
1702 }
1703
1704 static ssize_t
1705 show_urbs (struct device *dev, struct device_attribute *attr, char *buf)
1706 {
1707         struct usb_hcd          *hcd = dev_get_drvdata (dev);
1708         struct dummy            *dum = hcd_to_dummy (hcd);
1709         struct urbp             *urbp;
1710         size_t                  size = 0;
1711         unsigned long           flags;
1712
1713         spin_lock_irqsave (&dum->lock, flags);
1714         list_for_each_entry (urbp, &dum->urbp_list, urbp_list) {
1715                 size_t          temp;
1716
1717                 temp = show_urb (buf, PAGE_SIZE - size, urbp->urb);
1718                 buf += temp;
1719                 size += temp;
1720         }
1721         spin_unlock_irqrestore (&dum->lock, flags);
1722
1723         return size;
1724 }
1725 static DEVICE_ATTR (urbs, S_IRUGO, show_urbs, NULL);
1726
1727 static int dummy_start (struct usb_hcd *hcd)
1728 {
1729         struct dummy            *dum;
1730
1731         dum = hcd_to_dummy (hcd);
1732
1733         /*
1734          * MASTER side init ... we emulate a root hub that'll only ever
1735          * talk to one device (the slave side).  Also appears in sysfs,
1736          * just like more familiar pci-based HCDs.
1737          */
1738         spin_lock_init (&dum->lock);
1739         init_timer (&dum->timer);
1740         dum->timer.function = dummy_timer;
1741         dum->timer.data = (unsigned long) dum;
1742
1743         INIT_LIST_HEAD (&dum->urbp_list);
1744
1745         /* only show a low-power port: just 8mA */
1746         hcd->power_budget = 8;
1747         hcd->state = HC_STATE_RUNNING;
1748
1749 #ifdef CONFIG_USB_OTG
1750         hcd->self.otg_port = 1;
1751 #endif
1752
1753         /* FIXME 'urbs' should be a per-device thing, maybe in usbcore */
1754         device_create_file (dummy_dev(dum), &dev_attr_urbs);
1755         return 0;
1756 }
1757
1758 static void dummy_stop (struct usb_hcd *hcd)
1759 {
1760         struct dummy            *dum;
1761
1762         dum = hcd_to_dummy (hcd);
1763
1764         device_remove_file (dummy_dev(dum), &dev_attr_urbs);
1765         usb_gadget_unregister_driver (dum->driver);
1766         dev_info (dummy_dev(dum), "stopped\n");
1767 }
1768
1769 /*-------------------------------------------------------------------------*/
1770
1771 static int dummy_h_get_frame (struct usb_hcd *hcd)
1772 {
1773         return dummy_g_get_frame (NULL);
1774 }
1775
1776 static const struct hc_driver dummy_hcd = {
1777         .description =          (char *) driver_name,
1778         .product_desc =         "Dummy host controller",
1779         .hcd_priv_size =        sizeof(struct dummy),
1780
1781         .flags =                HCD_USB2,
1782
1783         .start =                dummy_start,
1784         .stop =                 dummy_stop,
1785
1786         .urb_enqueue =          dummy_urb_enqueue,
1787         .urb_dequeue =          dummy_urb_dequeue,
1788
1789         .get_frame_number =     dummy_h_get_frame,
1790
1791         .hub_status_data =      dummy_hub_status,
1792         .hub_control =          dummy_hub_control,
1793 };
1794
1795 static int dummy_hcd_probe (struct device *dev)
1796 {
1797         struct usb_hcd          *hcd;
1798         int                     retval;
1799
1800         dev_info (dev, "%s, driver " DRIVER_VERSION "\n", driver_desc);
1801
1802         hcd = usb_create_hcd (&dummy_hcd, dev, dev->bus_id);
1803         if (!hcd)
1804                 return -ENOMEM;
1805         the_controller = hcd_to_dummy (hcd);
1806
1807         retval = usb_add_hcd(hcd, 0, 0);
1808         if (retval != 0) {
1809                 usb_put_hcd (hcd);
1810                 the_controller = NULL;
1811         }
1812         return retval;
1813 }
1814
1815 static int dummy_hcd_remove (struct device *dev)
1816 {
1817         struct usb_hcd          *hcd;
1818
1819         hcd = dev_get_drvdata (dev);
1820         usb_remove_hcd (hcd);
1821         usb_put_hcd (hcd);
1822         the_controller = NULL;
1823         return 0;
1824 }
1825
1826 static struct device_driver dummy_hcd_driver = {
1827         .name           = (char *) driver_name,
1828         .bus            = &platform_bus_type,
1829         .probe          = dummy_hcd_probe,
1830         .remove         = dummy_hcd_remove,
1831 };
1832
1833 /*-------------------------------------------------------------------------*/
1834
1835 /* These don't need to do anything because the pdev structures are
1836  * statically allocated. */
1837 static void
1838 dummy_udc_release (struct device *dev) {}
1839
1840 static void
1841 dummy_hcd_release (struct device *dev) {}
1842
1843 static struct platform_device           the_udc_pdev = {
1844         .name           = (char *) gadget_name,
1845         .id             = -1,
1846         .dev            = {
1847                 .release        = dummy_udc_release,
1848         },
1849 };
1850
1851 static struct platform_device           the_hcd_pdev = {
1852         .name           = (char *) driver_name,
1853         .id             = -1,
1854         .dev            = {
1855                 .release        = dummy_hcd_release,
1856         },
1857 };
1858
1859 static int __init init (void)
1860 {
1861         int     retval;
1862
1863         if (usb_disabled ())
1864                 return -ENODEV;
1865
1866         retval = driver_register (&dummy_hcd_driver);
1867         if (retval < 0)
1868                 return retval;
1869
1870         retval = driver_register (&dummy_udc_driver);
1871         if (retval < 0)
1872                 goto err_register_udc_driver;
1873
1874         retval = platform_device_register (&the_hcd_pdev);
1875         if (retval < 0)
1876                 goto err_register_hcd;
1877
1878         retval = platform_device_register (&the_udc_pdev);
1879         if (retval < 0)
1880                 goto err_register_udc;
1881         return retval;
1882
1883 err_register_udc:
1884         platform_device_unregister (&the_hcd_pdev);
1885 err_register_hcd:
1886         driver_unregister (&dummy_udc_driver);
1887 err_register_udc_driver:
1888         driver_unregister (&dummy_hcd_driver);
1889         return retval;
1890 }
1891 module_init (init);
1892
1893 static void __exit cleanup (void)
1894 {
1895         platform_device_unregister (&the_udc_pdev);
1896         platform_device_unregister (&the_hcd_pdev);
1897         driver_unregister (&dummy_udc_driver);
1898         driver_unregister (&dummy_hcd_driver);
1899 }
1900 module_exit (cleanup);