drivers/usb/gadget/dummy_hcd.c

   1 /*
   2  * dummy_hcd.c -- Dummy/Loopback USB host and device emulator driver.
   3  *
   4  * Maintainer: Alan Stern <stern@rowland.harvard.edu>
   5  *
   6  * Copyright (C) 2003 David Brownell
   7  * Copyright (C) 2003-2005 Alan Stern
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  22  */
  23
  24
  25 /*
  26  * This exposes a device side "USB gadget" API, driven by requests to a
  27  * Linux-USB host controller driver.  USB traffic is simulated; there's
  28  * no need for USB hardware.  Use this with two other drivers:
  29  *
  30  *  - Gadget driver, responding to requests (slave);
  31  *  - Host-side device driver, as already familiar in Linux.
  32  *
  33  * Having this all in one kernel can help some stages of development,
  34  * bypassing some hardware (and driver) issues.  UML could help too.
  35  */
  36
  37 #include <linux/module.h>
  38 #include <linux/kernel.h>
  39 #include <linux/delay.h>
  40 #include <linux/ioport.h>
  41 #include <linux/slab.h>
  42 #include <linux/errno.h>
  43 #include <linux/init.h>
  44 #include <linux/timer.h>
  45 #include <linux/list.h>
  46 #include <linux/interrupt.h>
  47 #include <linux/platform_device.h>
  48 #include <linux/usb.h>
  49 #include <linux/usb/gadget.h>
  50 #include <linux/usb/hcd.h>
  51
  52 #include <asm/byteorder.h>
  53 #include <asm/io.h>
  54 #include <asm/irq.h>
  55 #include <asm/system.h>
  56 #include <asm/unaligned.h>
  57
  58
  59 #define DRIVER_DESC     "USB Host+Gadget Emulator"
  60 #define DRIVER_VERSION  "02 May 2005"
  61
  62 #define POWER_BUDGET    500     /* in mA; use 8 for low-power port testing */
  63
  64 static const char       driver_name [] = "dummy_hcd";
  65 static const char       driver_desc [] = "USB Host+Gadget Emulator";
  66
  67 static const char       gadget_name [] = "dummy_udc";
  68
  69 MODULE_DESCRIPTION (DRIVER_DESC);
  70 MODULE_AUTHOR ("David Brownell");
  71 MODULE_LICENSE ("GPL");
  72
  73 struct dummy_hcd_module_parameters {
  74         bool is_super_speed;
  75         bool is_high_speed;
  76 };
  77
  78 static struct dummy_hcd_module_parameters mod_data = {
  79         .is_super_speed = false,
  80         .is_high_speed = true,
  81 };
  82 module_param_named(is_super_speed, mod_data.is_super_speed, bool, S_IRUGO);
  83 MODULE_PARM_DESC(is_super_speed, "true to simulate SuperSpeed connection");
  84 module_param_named(is_high_speed, mod_data.is_high_speed, bool, S_IRUGO);
  85 MODULE_PARM_DESC(is_high_speed, "true to simulate HighSpeed connection");
  86 /*-------------------------------------------------------------------------*/
  87
  88 /* gadget side driver data structres */
  89 struct dummy_ep {
  90         struct list_head                queue;
  91         unsigned long                   last_io;        /* jiffies timestamp */
  92         struct usb_gadget               *gadget;
  93         const struct usb_endpoint_descriptor *desc;
  94         struct usb_ep                   ep;
  95         unsigned                        halted : 1;
  96         unsigned                        wedged : 1;
  97         unsigned                        already_seen : 1;
  98         unsigned                        setup_stage : 1;
  99 };
 100
 101 struct dummy_request {
 102         struct list_head                queue;          /* ep's requests */
 103         struct usb_request              req;
 104 };
 105
 106 static inline struct dummy_ep *usb_ep_to_dummy_ep (struct usb_ep *_ep)
 107 {
 108         return container_of (_ep, struct dummy_ep, ep);
 109 }
 110
 111 static inline struct dummy_request *usb_request_to_dummy_request
 112                 (struct usb_request *_req)
 113 {
 114         return container_of (_req, struct dummy_request, req);
 115 }
 116
 117 /*-------------------------------------------------------------------------*/
 118
 119 /*
 120  * Every device has ep0 for control requests, plus up to 30 more endpoints,
 121  * in one of two types:
 122  *
 123  *   - Configurable:  direction (in/out), type (bulk, iso, etc), and endpoint
 124  *     number can be changed.  Names like "ep-a" are used for this type.
 125  *
 126  *   - Fixed Function:  in other cases.  some characteristics may be mutable;
 127  *     that'd be hardware-specific.  Names like "ep12out-bulk" are used.
 128  *
 129  * Gadget drivers are responsible for not setting up conflicting endpoint
 130  * configurations, illegal or unsupported packet lengths, and so on.
 131  */
 132
 133 static const char ep0name [] = "ep0";
 134
 135 static const char *const ep_name [] = {
 136         ep0name,                                /* everyone has ep0 */
 137
 138         /* act like a net2280: high speed, six configurable endpoints */
 139         "ep-a", "ep-b", "ep-c", "ep-d", "ep-e", "ep-f",
 140
 141         /* or like pxa250: fifteen fixed function endpoints */
 142         "ep1in-bulk", "ep2out-bulk", "ep3in-iso", "ep4out-iso", "ep5in-int",
 143         "ep6in-bulk", "ep7out-bulk", "ep8in-iso", "ep9out-iso", "ep10in-int",
 144         "ep11in-bulk", "ep12out-bulk", "ep13in-iso", "ep14out-iso",
 145                 "ep15in-int",
 146
 147         /* or like sa1100: two fixed function endpoints */
 148         "ep1out-bulk", "ep2in-bulk",
 149 };
 150 #define DUMMY_ENDPOINTS ARRAY_SIZE(ep_name)
 151
 152 /*-------------------------------------------------------------------------*/
 153
 154 #define FIFO_SIZE               64
 155
 156 struct urbp {
 157         struct urb              *urb;
 158         struct list_head        urbp_list;
 159 };
 160
 161
 162 enum dummy_rh_state {
 163         DUMMY_RH_RESET,
 164         DUMMY_RH_SUSPENDED,
 165         DUMMY_RH_RUNNING
 166 };
 167
 168 struct dummy_hcd {
 169         struct dummy                    *dum;
 170         enum dummy_rh_state             rh_state;
 171         struct timer_list               timer;
 172         u32                             port_status;
 173         u32                             old_status;
 174         unsigned long                   re_timeout;
 175
 176         struct usb_device               *udev;
 177         struct list_head                urbp_list;
 178
 179         unsigned                        active:1;
 180         unsigned                        old_active:1;
 181         unsigned                        resuming:1;
 182 };
 183
 184 struct dummy {
 185         spinlock_t                      lock;
 186
 187         /*
 188          * SLAVE/GADGET side support
 189          */
 190         struct dummy_ep                 ep [DUMMY_ENDPOINTS];
 191         int                             address;
 192         struct usb_gadget               gadget;
 193         struct usb_gadget_driver        *driver;
 194         struct dummy_request            fifo_req;
 195         u8                              fifo_buf [FIFO_SIZE];
 196         u16                             devstatus;
 197         unsigned                        udc_suspended:1;
 198         unsigned                        pullup:1;
 199
 200         /*
 201          * MASTER/HOST side support
 202          */
 203         struct dummy_hcd                *hs_hcd;
 204         struct dummy_hcd                *ss_hcd;
 205 };
 206
 207 static inline struct dummy_hcd *hcd_to_dummy_hcd(struct usb_hcd *hcd)
 208 {
 209         return (struct dummy_hcd *) (hcd->hcd_priv);
 210 }
 211
 212 static inline struct usb_hcd *dummy_hcd_to_hcd(struct dummy_hcd *dum)
 213 {
 214         return container_of((void *) dum, struct usb_hcd, hcd_priv);
 215 }
 216
 217 static inline struct device *dummy_dev(struct dummy_hcd *dum)
 218 {
 219         return dummy_hcd_to_hcd(dum)->self.controller;
 220 }
 221
 222 static inline struct device *udc_dev (struct dummy *dum)
 223 {
 224         return dum->gadget.dev.parent;
 225 }
 226
 227 static inline struct dummy *ep_to_dummy (struct dummy_ep *ep)
 228 {
 229         return container_of (ep->gadget, struct dummy, gadget);
 230 }
 231
 232 static inline struct dummy_hcd *gadget_to_dummy_hcd(struct usb_gadget *gadget)
 233 {
 234         struct dummy *dum = container_of(gadget, struct dummy, gadget);
 235         if (dum->gadget.speed == USB_SPEED_SUPER)
 236                 return dum->ss_hcd;
 237         else
 238                 return dum->hs_hcd;
 239 }
 240
 241 static inline struct dummy *gadget_dev_to_dummy (struct device *dev)
 242 {
 243         return container_of (dev, struct dummy, gadget.dev);
 244 }
 245
 246 static struct dummy                     the_controller;
 247
 248 /*-------------------------------------------------------------------------*/
 249
 250 /* SLAVE/GADGET SIDE UTILITY ROUTINES */
 251
 252 /* called with spinlock held */
 253 static void nuke (struct dummy *dum, struct dummy_ep *ep)
 254 {
 255         while (!list_empty (&ep->queue)) {
 256                 struct dummy_request    *req;
 257
 258                 req = list_entry (ep->queue.next, struct dummy_request, queue);
 259                 list_del_init (&req->queue);
 260                 req->req.status = -ESHUTDOWN;
 261
 262                 spin_unlock (&dum->lock);
 263                 req->req.complete (&ep->ep, &req->req);
 264                 spin_lock (&dum->lock);
 265         }
 266 }
 267
 268 /* caller must hold lock */
 269 static void
 270 stop_activity (struct dummy *dum)
 271 {
 272         struct dummy_ep *ep;
 273
 274         /* prevent any more requests */
 275         dum->address = 0;
 276
 277         /* The timer is left running so that outstanding URBs can fail */
 278
 279         /* nuke any pending requests first, so driver i/o is quiesced */
 280         list_for_each_entry (ep, &dum->gadget.ep_list, ep.ep_list)
 281                 nuke (dum, ep);
 282
 283         /* driver now does any non-usb quiescing necessary */
 284 }
 285
 286 /**
 287  * set_link_state_by_speed() - Sets the current state of the link according to
 288  *      the hcd speed
 289  * @dum_hcd: pointer to the dummy_hcd structure to update the link state for
 290  *
 291  * This function updates the port_status according to the link state and the
 292  * speed of the hcd.
 293  */
 294 static void set_link_state_by_speed(struct dummy_hcd *dum_hcd)
 295 {
 296         struct dummy *dum = dum_hcd->dum;
 297
 298         if (dummy_hcd_to_hcd(dum_hcd)->speed == HCD_USB3) {
 299                 if ((dum_hcd->port_status & USB_SS_PORT_STAT_POWER) == 0) {
 300                         dum_hcd->port_status = 0;
 301                 } else if (!dum->pullup || dum->udc_suspended) {
 302                         /* UDC suspend must cause a disconnect */
 303                         dum_hcd->port_status &= ~(USB_PORT_STAT_CONNECTION |
 304                                                 USB_PORT_STAT_ENABLE);
 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                 } else {
 310                         /* device is connected and not suspended */
 311                         dum_hcd->port_status |= (USB_PORT_STAT_CONNECTION |
 312                                                  USB_PORT_STAT_SPEED_5GBPS) ;
 313                         if ((dum_hcd->old_status &
 314                              USB_PORT_STAT_CONNECTION) == 0)
 315                                 dum_hcd->port_status |=
 316                                         (USB_PORT_STAT_C_CONNECTION << 16);
 317                         if ((dum_hcd->port_status &
 318                              USB_PORT_STAT_ENABLE) == 1 &&
 319                                 (dum_hcd->port_status &
 320                                  USB_SS_PORT_LS_U0) == 1 &&
 321                                 dum_hcd->rh_state != DUMMY_RH_SUSPENDED)
 322                                 dum_hcd->active = 1;
 323                 }
 324         } else {
 325                 if ((dum_hcd->port_status & USB_PORT_STAT_POWER) == 0) {
 326                         dum_hcd->port_status = 0;
 327                 } else if (!dum->pullup || dum->udc_suspended) {
 328                         /* UDC suspend must cause a disconnect */
 329                         dum_hcd->port_status &= ~(USB_PORT_STAT_CONNECTION |
 330                                                 USB_PORT_STAT_ENABLE |
 331                                                 USB_PORT_STAT_LOW_SPEED |
 332                                                 USB_PORT_STAT_HIGH_SPEED |
 333                                                 USB_PORT_STAT_SUSPEND);
 334                         if ((dum_hcd->old_status &
 335                              USB_PORT_STAT_CONNECTION) != 0)
 336                                 dum_hcd->port_status |=
 337                                         (USB_PORT_STAT_C_CONNECTION << 16);
 338                 } else {
 339                         dum_hcd->port_status |= USB_PORT_STAT_CONNECTION;
 340                         if ((dum_hcd->old_status &
 341                              USB_PORT_STAT_CONNECTION) == 0)
 342                                 dum_hcd->port_status |=
 343                                         (USB_PORT_STAT_C_CONNECTION << 16);
 344                         if ((dum_hcd->port_status & USB_PORT_STAT_ENABLE) == 0)
 345                                 dum_hcd->port_status &= ~USB_PORT_STAT_SUSPEND;
 346                         else if ((dum_hcd->port_status &
 347                                   USB_PORT_STAT_SUSPEND) == 0 &&
 348                                         dum_hcd->rh_state != DUMMY_RH_SUSPENDED)
 349                                 dum_hcd->active = 1;
 350                 }
 351         }
 352 }
 353
 354 /* caller must hold lock */
 355 static void set_link_state(struct dummy_hcd *dum_hcd)
 356 {
 357         struct dummy *dum = dum_hcd->dum;
 358
 359         dum_hcd->active = 0;
 360         if (dum->pullup)
 361                 if ((dummy_hcd_to_hcd(dum_hcd)->speed == HCD_USB3 &&
 362                      dum->gadget.speed != USB_SPEED_SUPER) ||
 363                     (dummy_hcd_to_hcd(dum_hcd)->speed != HCD_USB3 &&
 364                      dum->gadget.speed == USB_SPEED_SUPER))
 365                         return;
 366
 367         set_link_state_by_speed(dum_hcd);
 368
 369         if ((dum_hcd->port_status & USB_PORT_STAT_ENABLE) == 0 ||
 370              dum_hcd->active)
 371                 dum_hcd->resuming = 0;
 372
 373         /* if !connected or reset */
 374         if ((dum_hcd->port_status & USB_PORT_STAT_CONNECTION) == 0 ||
 375                         (dum_hcd->port_status & USB_PORT_STAT_RESET) != 0) {
 376                 /*
 377                  * We're connected and not reset (reset occurred now),
 378                  * and driver attached - disconnect!
 379                  */
 380                 if ((dum_hcd->old_status & USB_PORT_STAT_CONNECTION) != 0 &&
 381                     (dum_hcd->old_status & USB_PORT_STAT_RESET) == 0 &&
 382                     dum->driver) {
 383                         stop_activity(dum);
 384                         spin_unlock(&dum->lock);
 385                         dum->driver->disconnect(&dum->gadget);
 386                         spin_lock(&dum->lock);
 387                 }
 388         } else if (dum_hcd->active != dum_hcd->old_active) {
 389                 if (dum_hcd->old_active && dum->driver->suspend) {
 390                         spin_unlock(&dum->lock);
 391                         dum->driver->suspend(&dum->gadget);
 392                         spin_lock(&dum->lock);
 393                 } else if (!dum_hcd->old_active &&  dum->driver->resume) {
 394                         spin_unlock(&dum->lock);
 395                         dum->driver->resume(&dum->gadget);
 396                         spin_lock(&dum->lock);
 397                 }
 398         }
 399
 400         dum_hcd->old_status = dum_hcd->port_status;
 401         dum_hcd->old_active = dum_hcd->active;
 402 }
 403
 404 /*-------------------------------------------------------------------------*/
 405
 406 /* SLAVE/GADGET SIDE DRIVER
 407  *
 408  * This only tracks gadget state.  All the work is done when the host
 409  * side tries some (emulated) i/o operation.  Real device controller
 410  * drivers would do real i/o using dma, fifos, irqs, timers, etc.
 411  */
 412
 413 #define is_enabled(dum) \
 414         (dum->port_status & USB_PORT_STAT_ENABLE)
 415
 416 static int
 417 dummy_enable (struct usb_ep *_ep, const struct usb_endpoint_descriptor *desc)
 418 {
 419         struct dummy            *dum;
 420         struct dummy_hcd        *dum_hcd;
 421         struct dummy_ep         *ep;
 422         unsigned                max;
 423         int                     retval;
 424
 425         ep = usb_ep_to_dummy_ep (_ep);
 426         if (!_ep || !desc || ep->desc || _ep->name == ep0name
 427                         || desc->bDescriptorType != USB_DT_ENDPOINT)
 428                 return -EINVAL;
 429         dum = ep_to_dummy (ep);
 430         if (!dum->driver)
 431                 return -ESHUTDOWN;
 432
 433         dum_hcd = gadget_to_dummy_hcd(&dum->gadget);
 434         if (!is_enabled(dum_hcd))
 435                 return -ESHUTDOWN;
 436
 437         /*
 438          * For HS/FS devices only bits 0..10 of the wMaxPacketSize represent the
 439          * maximum packet size.
 440          * For SS devices the wMaxPacketSize is limited by 1024.
 441          */
 442         max = le16_to_cpu(desc->wMaxPacketSize) & 0x7ff;
 443
 444         /* drivers must not request bad settings, since lower levels
 445          * (hardware or its drivers) may not check.  some endpoints
 446          * can't do iso, many have maxpacket limitations, etc.
 447          *
 448          * since this "hardware" driver is here to help debugging, we
 449          * have some extra sanity checks.  (there could be more though,
 450          * especially for "ep9out" style fixed function ones.)
 451          */
 452         retval = -EINVAL;
 453         switch (desc->bmAttributes & 0x03) {
 454         case USB_ENDPOINT_XFER_BULK:
 455                 if (strstr (ep->ep.name, "-iso")
 456                                 || strstr (ep->ep.name, "-int")) {
 457                         goto done;
 458                 }
 459                 switch (dum->gadget.speed) {
 460                 case USB_SPEED_SUPER:
 461                         if (max == 1024)
 462                                 break;
 463                         goto done;
 464                 case USB_SPEED_HIGH:
 465                         if (max == 512)
 466                                 break;
 467                         goto done;
 468                 case USB_SPEED_FULL:
 469                         if (max == 8 || max == 16 || max == 32 || max == 64)
 470                                 /* we'll fake any legal size */
 471                                 break;
 472                         /* save a return statement */
 473                 default:
 474                         goto done;
 475                 }
 476                 break;
 477         case USB_ENDPOINT_XFER_INT:
 478                 if (strstr (ep->ep.name, "-iso")) /* bulk is ok */
 479                         goto done;
 480                 /* real hardware might not handle all packet sizes */
 481                 switch (dum->gadget.speed) {
 482                 case USB_SPEED_SUPER:
 483                 case USB_SPEED_HIGH:
 484                         if (max <= 1024)
 485                                 break;
 486                         /* save a return statement */
 487                 case USB_SPEED_FULL:
 488                         if (max <= 64)
 489                                 break;
 490                         /* save a return statement */
 491                 default:
 492                         if (max <= 8)
 493                                 break;
 494                         goto done;
 495                 }
 496                 break;
 497         case USB_ENDPOINT_XFER_ISOC:
 498                 if (strstr (ep->ep.name, "-bulk")
 499                                 || strstr (ep->ep.name, "-int"))
 500                         goto done;
 501                 /* real hardware might not handle all packet sizes */
 502                 switch (dum->gadget.speed) {
 503                 case USB_SPEED_SUPER:
 504                 case USB_SPEED_HIGH:
 505                         if (max <= 1024)
 506                                 break;
 507                         /* save a return statement */
 508                 case USB_SPEED_FULL:
 509                         if (max <= 1023)
 510                                 break;
 511                         /* save a return statement */
 512                 default:
 513                         goto done;
 514                 }
 515                 break;
 516         default:
 517                 /* few chips support control except on ep0 */
 518                 goto done;
 519         }
 520
 521         _ep->maxpacket = max;
 522         ep->desc = desc;
 523
 524         dev_dbg (udc_dev(dum), "enabled %s (ep%d%s-%s) maxpacket %d\n",
 525                 _ep->name,
 526                 desc->bEndpointAddress & 0x0f,
 527                 (desc->bEndpointAddress & USB_DIR_IN) ? "in" : "out",
 528                 ({ char *val;
 529                  switch (desc->bmAttributes & 0x03) {
 530                  case USB_ENDPOINT_XFER_BULK:
 531                          val = "bulk";
 532                          break;
 533                  case USB_ENDPOINT_XFER_ISOC:
 534                          val = "iso";
 535                          break;
 536                  case USB_ENDPOINT_XFER_INT:
 537                          val = "intr";
 538                          break;
 539                  default:
 540                          val = "ctrl";
 541                          break;
 542                  }; val; }),
 543                 max);
 544
 545         /* at this point real hardware should be NAKing transfers
 546          * to that endpoint, until a buffer is queued to it.
 547          */
 548         ep->halted = ep->wedged = 0;
 549         retval = 0;
 550 done:
 551         return retval;
 552 }
 553
 554 static int dummy_disable (struct usb_ep *_ep)
 555 {
 556         struct dummy_ep         *ep;
 557         struct dummy            *dum;
 558         unsigned long           flags;
 559         int                     retval;
 560
 561         ep = usb_ep_to_dummy_ep (_ep);
 562         if (!_ep || !ep->desc || _ep->name == ep0name)
 563                 return -EINVAL;
 564         dum = ep_to_dummy (ep);
 565
 566         spin_lock_irqsave (&dum->lock, flags);
 567         ep->desc = NULL;
 568         retval = 0;
 569         nuke (dum, ep);
 570         spin_unlock_irqrestore (&dum->lock, flags);
 571
 572         dev_dbg (udc_dev(dum), "disabled %s\n", _ep->name);
 573         return retval;
 574 }
 575
 576 static struct usb_request *
 577 dummy_alloc_request (struct usb_ep *_ep, gfp_t mem_flags)
 578 {
 579         struct dummy_ep         *ep;
 580         struct dummy_request    *req;
 581
 582         if (!_ep)
 583                 return NULL;
 584         ep = usb_ep_to_dummy_ep (_ep);
 585
 586         req = kzalloc(sizeof(*req), mem_flags);
 587         if (!req)
 588                 return NULL;
 589         INIT_LIST_HEAD (&req->queue);
 590         return &req->req;
 591 }
 592
 593 static void
 594 dummy_free_request (struct usb_ep *_ep, struct usb_request *_req)
 595 {
 596         struct dummy_ep         *ep;
 597         struct dummy_request    *req;
 598
 599         ep = usb_ep_to_dummy_ep (_ep);
 600         if (!ep || !_req || (!ep->desc && _ep->name != ep0name))
 601                 return;
 602
 603         req = usb_request_to_dummy_request (_req);
 604         WARN_ON (!list_empty (&req->queue));
 605         kfree (req);
 606 }
 607
 608 static void
 609 fifo_complete (struct usb_ep *ep, struct usb_request *req)
 610 {
 611 }
 612
 613 static int
 614 dummy_queue (struct usb_ep *_ep, struct usb_request *_req,
 615                 gfp_t mem_flags)
 616 {
 617         struct dummy_ep         *ep;
 618         struct dummy_request    *req;
 619         struct dummy            *dum;
 620         struct dummy_hcd        *dum_hcd;
 621         unsigned long           flags;
 622
 623         req = usb_request_to_dummy_request (_req);
 624         if (!_req || !list_empty (&req->queue) || !_req->complete)
 625                 return -EINVAL;
 626
 627         ep = usb_ep_to_dummy_ep (_ep);
 628         if (!_ep || (!ep->desc && _ep->name != ep0name))
 629                 return -EINVAL;
 630
 631         dum = ep_to_dummy (ep);
 632         dum_hcd = gadget_to_dummy_hcd(&dum->gadget);
 633         if (!dum->driver || !is_enabled(dum_hcd))
 634                 return -ESHUTDOWN;
 635
 636 #if 0
 637         dev_dbg (udc_dev(dum), "ep %p queue req %p to %s, len %d buf %p\n",
 638                         ep, _req, _ep->name, _req->length, _req->buf);
 639 #endif
 640
 641         _req->status = -EINPROGRESS;
 642         _req->actual = 0;
 643         spin_lock_irqsave (&dum->lock, flags);
 644
 645         /* implement an emulated single-request FIFO */
 646         if (ep->desc && (ep->desc->bEndpointAddress & USB_DIR_IN) &&
 647                         list_empty (&dum->fifo_req.queue) &&
 648                         list_empty (&ep->queue) &&
 649                         _req->length <= FIFO_SIZE) {
 650                 req = &dum->fifo_req;
 651                 req->req = *_req;
 652                 req->req.buf = dum->fifo_buf;
 653                 memcpy (dum->fifo_buf, _req->buf, _req->length);
 654                 req->req.context = dum;
 655                 req->req.complete = fifo_complete;
 656
 657                 list_add_tail(&req->queue, &ep->queue);
 658                 spin_unlock (&dum->lock);
 659                 _req->actual = _req->length;
 660                 _req->status = 0;
 661                 _req->complete (_ep, _req);
 662                 spin_lock (&dum->lock);
 663         }  else
 664                 list_add_tail(&req->queue, &ep->queue);
 665         spin_unlock_irqrestore (&dum->lock, flags);
 666
 667         /* real hardware would likely enable transfers here, in case
 668          * it'd been left NAKing.
 669          */
 670         return 0;
 671 }
 672
 673 static int dummy_dequeue (struct usb_ep *_ep, struct usb_request *_req)
 674 {
 675         struct dummy_ep         *ep;
 676         struct dummy            *dum;
 677         int                     retval = -EINVAL;
 678         unsigned long           flags;
 679         struct dummy_request    *req = NULL;
 680
 681         if (!_ep || !_req)
 682                 return retval;
 683         ep = usb_ep_to_dummy_ep (_ep);
 684         dum = ep_to_dummy (ep);
 685
 686         if (!dum->driver)
 687                 return -ESHUTDOWN;
 688
 689         local_irq_save (flags);
 690         spin_lock (&dum->lock);
 691         list_for_each_entry (req, &ep->queue, queue) {
 692                 if (&req->req == _req) {
 693                         list_del_init (&req->queue);
 694                         _req->status = -ECONNRESET;
 695                         retval = 0;
 696                         break;
 697                 }
 698         }
 699         spin_unlock (&dum->lock);
 700
 701         if (retval == 0) {
 702                 dev_dbg (udc_dev(dum),
 703                                 "dequeued req %p from %s, len %d buf %p\n",
 704                                 req, _ep->name, _req->length, _req->buf);
 705                 _req->complete (_ep, _req);
 706         }
 707         local_irq_restore (flags);
 708         return retval;
 709 }
 710
 711 static int
 712 dummy_set_halt_and_wedge(struct usb_ep *_ep, int value, int wedged)
 713 {
 714         struct dummy_ep         *ep;
 715         struct dummy            *dum;
 716
 717         if (!_ep)
 718                 return -EINVAL;
 719         ep = usb_ep_to_dummy_ep (_ep);
 720         dum = ep_to_dummy (ep);
 721         if (!dum->driver)
 722                 return -ESHUTDOWN;
 723         if (!value)
 724                 ep->halted = ep->wedged = 0;
 725         else if (ep->desc && (ep->desc->bEndpointAddress & USB_DIR_IN) &&
 726                         !list_empty (&ep->queue))
 727                 return -EAGAIN;
 728         else {
 729                 ep->halted = 1;
 730                 if (wedged)
 731                         ep->wedged = 1;
 732         }
 733         /* FIXME clear emulated data toggle too */
 734         return 0;
 735 }
 736
 737 static int
 738 dummy_set_halt(struct usb_ep *_ep, int value)
 739 {
 740         return dummy_set_halt_and_wedge(_ep, value, 0);
 741 }
 742
 743 static int dummy_set_wedge(struct usb_ep *_ep)
 744 {
 745         if (!_ep || _ep->name == ep0name)
 746                 return -EINVAL;
 747         return dummy_set_halt_and_wedge(_ep, 1, 1);
 748 }
 749
 750 static const struct usb_ep_ops dummy_ep_ops = {
 751         .enable         = dummy_enable,
 752         .disable        = dummy_disable,
 753
 754         .alloc_request  = dummy_alloc_request,
 755         .free_request   = dummy_free_request,
 756
 757         .queue          = dummy_queue,
 758         .dequeue        = dummy_dequeue,
 759
 760         .set_halt       = dummy_set_halt,
 761         .set_wedge      = dummy_set_wedge,
 762 };
 763
 764 /*-------------------------------------------------------------------------*/
 765
 766 /* there are both host and device side versions of this call ... */
 767 static int dummy_g_get_frame (struct usb_gadget *_gadget)
 768 {
 769         struct timeval  tv;
 770
 771         do_gettimeofday (&tv);
 772         return tv.tv_usec / 1000;
 773 }
 774
 775 static int dummy_wakeup (struct usb_gadget *_gadget)
 776 {
 777         struct dummy_hcd *dum_hcd;
 778
 779         dum_hcd = gadget_to_dummy_hcd(_gadget);
 780         if (!(dum_hcd->dum->devstatus & ((1 << USB_DEVICE_B_HNP_ENABLE)
 781                                 | (1 << USB_DEVICE_REMOTE_WAKEUP))))
 782                 return -EINVAL;
 783         if ((dum_hcd->port_status & USB_PORT_STAT_CONNECTION) == 0)
 784                 return -ENOLINK;
 785         if ((dum_hcd->port_status & USB_PORT_STAT_SUSPEND) == 0 &&
 786                          dum_hcd->rh_state != DUMMY_RH_SUSPENDED)
 787                 return -EIO;
 788
 789         /* FIXME: What if the root hub is suspended but the port isn't? */
 790
 791         /* hub notices our request, issues downstream resume, etc */
 792         dum_hcd->resuming = 1;
 793         dum_hcd->re_timeout = jiffies + msecs_to_jiffies(20);
 794         mod_timer(&dummy_hcd_to_hcd(dum_hcd)->rh_timer, dum_hcd->re_timeout);
 795         return 0;
 796 }
 797
 798 static int dummy_set_selfpowered (struct usb_gadget *_gadget, int value)
 799 {
 800         struct dummy    *dum;
 801
 802         dum = (gadget_to_dummy_hcd(_gadget))->dum;
 803         if (value)
 804                 dum->devstatus |= (1 << USB_DEVICE_SELF_POWERED);
 805         else
 806                 dum->devstatus &= ~(1 << USB_DEVICE_SELF_POWERED);
 807         return 0;
 808 }
 809
 810 static void dummy_udc_udpate_ep0(struct dummy *dum)
 811 {
 812         u32 i;
 813
 814         if (dum->gadget.speed == USB_SPEED_SUPER) {
 815                 for (i = 0; i < DUMMY_ENDPOINTS; i++)
 816                         dum->ep[i].ep.max_streams = 0x10;
 817                 dum->ep[0].ep.maxpacket = 9;
 818         } else {
 819                 for (i = 0; i < DUMMY_ENDPOINTS; i++)
 820                         dum->ep[i].ep.max_streams = 0;
 821                 dum->ep[0].ep.maxpacket = 64;
 822         }
 823 }
 824
 825 static int dummy_pullup (struct usb_gadget *_gadget, int value)
 826 {
 827         struct dummy_hcd *dum_hcd;
 828         struct dummy    *dum;
 829         unsigned long   flags;
 830
 831         dum = gadget_dev_to_dummy(&_gadget->dev);
 832
 833         if (value && dum->driver) {
 834                 if (mod_data.is_super_speed)
 835                         dum->gadget.speed = dum->driver->speed;
 836                 else if (mod_data.is_high_speed)
 837                         dum->gadget.speed = min_t(u8, USB_SPEED_HIGH,
 838                                         dum->driver->speed);
 839                 else
 840                         dum->gadget.speed = USB_SPEED_FULL;
 841                 dummy_udc_udpate_ep0(dum);
 842
 843                 if (dum->gadget.speed < dum->driver->speed)
 844                         dev_dbg(udc_dev(dum), "This device can perform faster"
 845                                         " if you connect it to a %s port...\n",
 846                                         (dum->driver->speed == USB_SPEED_SUPER ?
 847                                          "SuperSpeed" : "HighSpeed"));
 848         }
 849         dum_hcd = gadget_to_dummy_hcd(_gadget);
 850
 851         spin_lock_irqsave (&dum->lock, flags);
 852         dum->pullup = (value != 0);
 853         set_link_state(dum_hcd);
 854         spin_unlock_irqrestore (&dum->lock, flags);
 855
 856         usb_hcd_poll_rh_status(dummy_hcd_to_hcd(dum_hcd));
 857         return 0;
 858 }
 859
 860 static int dummy_udc_start(struct usb_gadget *g,
 861                 struct usb_gadget_driver *driver);
 862 static int dummy_udc_stop(struct usb_gadget *g,
 863                 struct usb_gadget_driver *driver);
 864
 865 static const struct usb_gadget_ops dummy_ops = {
 866         .get_frame      = dummy_g_get_frame,
 867         .wakeup         = dummy_wakeup,
 868         .set_selfpowered = dummy_set_selfpowered,
 869         .pullup         = dummy_pullup,
 870         .udc_start      = dummy_udc_start,
 871         .udc_stop       = dummy_udc_stop,
 872 };
 873
 874 /*-------------------------------------------------------------------------*/
 875
 876 /* "function" sysfs attribute */
 877 static ssize_t
 878 show_function (struct device *dev, struct device_attribute *attr, char *buf)
 879 {
 880         struct dummy    *dum = gadget_dev_to_dummy (dev);
 881
 882         if (!dum->driver || !dum->driver->function)
 883                 return 0;
 884         return scnprintf (buf, PAGE_SIZE, "%s\n", dum->driver->function);
 885 }
 886 static DEVICE_ATTR (function, S_IRUGO, show_function, NULL);
 887
 888 /*-------------------------------------------------------------------------*/
 889
 890 /*
 891  * Driver registration/unregistration.
 892  *
 893  * This is basically hardware-specific; there's usually only one real USB
 894  * device (not host) controller since that's how USB devices are intended
 895  * to work.  So most implementations of these api calls will rely on the
 896  * fact that only one driver will ever bind to the hardware.  But curious
 897  * hardware can be built with discrete components, so the gadget API doesn't
 898  * require that assumption.
 899  *
 900  * For this emulator, it might be convenient to create a usb slave device
 901  * for each driver that registers:  just add to a big root hub.
 902  */
 903
 904 static int dummy_udc_start(struct usb_gadget *g,
 905                 struct usb_gadget_driver *driver)
 906 {
 907         struct dummy_hcd        *dum_hcd = gadget_to_dummy_hcd(g);
 908         struct dummy            *dum = dum_hcd->dum;
 909
 910         if (driver->speed == USB_SPEED_UNKNOWN)
 911                 return -EINVAL;
 912
 913         /*
 914          * SLAVE side init ... the layer above hardware, which
 915          * can't enumerate without help from the driver we're binding.
 916          */
 917
 918         dum->devstatus = 0;
 919
 920         dum->driver = driver;
 921         dev_dbg (udc_dev(dum), "binding gadget driver '%s'\n",
 922                         driver->driver.name);
 923         return 0;
 924 }
 925
 926 static int dummy_udc_stop(struct usb_gadget *g,
 927                 struct usb_gadget_driver *driver)
 928 {
 929         struct dummy_hcd        *dum_hcd = gadget_to_dummy_hcd(g);
 930         struct dummy            *dum = dum_hcd->dum;
 931
 932         dev_dbg (udc_dev(dum), "unregister gadget driver '%s'\n",
 933                         driver->driver.name);
 934
 935         dum->driver = NULL;
 936
 937         dummy_pullup(&dum->gadget, 0);
 938         return 0;
 939 }
 940
 941 #undef is_enabled
 942
 943 /* The gadget structure is stored inside the hcd structure and will be
 944  * released along with it. */
 945 static void
 946 dummy_gadget_release (struct device *dev)
 947 {
 948         return;
 949 }
 950
 951 static void init_dummy_udc_hw(struct dummy *dum)
 952 {
 953         int i;
 954
 955         INIT_LIST_HEAD(&dum->gadget.ep_list);
 956         for (i = 0; i < DUMMY_ENDPOINTS; i++) {
 957                 struct dummy_ep *ep = &dum->ep[i];
 958
 959                 if (!ep_name[i])
 960                         break;
 961                 ep->ep.name = ep_name[i];
 962                 ep->ep.ops = &dummy_ep_ops;
 963                 list_add_tail(&ep->ep.ep_list, &dum->gadget.ep_list);
 964                 ep->halted = ep->wedged = ep->already_seen =
 965                                 ep->setup_stage = 0;
 966                 ep->ep.maxpacket = ~0;
 967                 ep->last_io = jiffies;
 968                 ep->gadget = &dum->gadget;
 969                 ep->desc = NULL;
 970                 INIT_LIST_HEAD(&ep->queue);
 971         }
 972
 973         dum->gadget.ep0 = &dum->ep[0].ep;
 974         list_del_init(&dum->ep[0].ep.ep_list);
 975         INIT_LIST_HEAD(&dum->fifo_req.queue);
 976
 977 #ifdef CONFIG_USB_OTG
 978         dum->gadget.is_otg = 1;
 979 #endif
 980 }
 981
 982 static int dummy_udc_probe (struct platform_device *pdev)
 983 {
 984         struct dummy    *dum = &the_controller;
 985         int             rc;
 986
 987         dum->gadget.name = gadget_name;
 988         dum->gadget.ops = &dummy_ops;
 989         dum->gadget.is_dualspeed = 1;
 990
 991         dev_set_name(&dum->gadget.dev, "gadget");
 992         dum->gadget.dev.parent = &pdev->dev;
 993         dum->gadget.dev.release = dummy_gadget_release;
 994         rc = device_register (&dum->gadget.dev);
 995         if (rc < 0) {
 996                 put_device(&dum->gadget.dev);
 997                 return rc;
 998         }
 999
1000         init_dummy_udc_hw(dum);
1001
1002         rc = usb_add_gadget_udc(&pdev->dev, &dum->gadget);
1003         if (rc < 0)
1004                 goto err_udc;
1005
1006         rc = device_create_file (&dum->gadget.dev, &dev_attr_function);
1007         if (rc < 0)
1008                 goto err_dev;
1009         platform_set_drvdata(pdev, dum);
1010         return rc;
1011
1012 err_dev:
1013         usb_del_gadget_udc(&dum->gadget);
1014 err_udc:
1015         device_unregister(&dum->gadget.dev);
1016         return rc;
1017 }
1018
1019 static int dummy_udc_remove (struct platform_device *pdev)
1020 {
1021         struct dummy    *dum = platform_get_drvdata (pdev);
1022
1023         usb_del_gadget_udc(&dum->gadget);
1024         platform_set_drvdata (pdev, NULL);
1025         device_remove_file (&dum->gadget.dev, &dev_attr_function);
1026         device_unregister (&dum->gadget.dev);
1027         return 0;
1028 }
1029
1030 static void dummy_udc_pm(struct dummy *dum, struct dummy_hcd *dum_hcd,
1031                 int suspend)
1032 {
1033         spin_lock_irq(&dum->lock);
1034         dum->udc_suspended = suspend;
1035         set_link_state(dum_hcd);
1036         spin_unlock_irq(&dum->lock);
1037 }
1038
1039 static int dummy_udc_suspend(struct platform_device *pdev, pm_message_t state)
1040 {
1041         struct dummy            *dum = platform_get_drvdata(pdev);
1042         struct dummy_hcd        *dum_hcd = gadget_to_dummy_hcd(&dum->gadget);
1043
1044         dev_dbg(&pdev->dev, "%s\n", __func__);
1045         dummy_udc_pm(dum, dum_hcd, 1);
1046         usb_hcd_poll_rh_status(dummy_hcd_to_hcd(dum_hcd));
1047         return 0;
1048 }
1049
1050 static int dummy_udc_resume(struct platform_device *pdev)
1051 {
1052         struct dummy            *dum = platform_get_drvdata(pdev);
1053         struct dummy_hcd        *dum_hcd = gadget_to_dummy_hcd(&dum->gadget);
1054
1055         dev_dbg(&pdev->dev, "%s\n", __func__);
1056         dummy_udc_pm(dum, dum_hcd, 0);
1057         usb_hcd_poll_rh_status(dummy_hcd_to_hcd(dum_hcd));
1058         return 0;
1059 }
1060
1061 static struct platform_driver dummy_udc_driver = {
1062         .probe          = dummy_udc_probe,
1063         .remove         = dummy_udc_remove,
1064         .suspend        = dummy_udc_suspend,
1065         .resume         = dummy_udc_resume,
1066         .driver         = {
1067                 .name   = (char *) gadget_name,
1068                 .owner  = THIS_MODULE,
1069         },
1070 };
1071
1072 /*-------------------------------------------------------------------------*/
1073
1074 /* MASTER/HOST SIDE DRIVER
1075  *
1076  * this uses the hcd framework to hook up to host side drivers.
1077  * its root hub will only have one device, otherwise it acts like
1078  * a normal host controller.
1079  *
1080  * when urbs are queued, they're just stuck on a list that we
1081  * scan in a timer callback.  that callback connects writes from
1082  * the host with reads from the device, and so on, based on the
1083  * usb 2.0 rules.
1084  */
1085
1086 static int dummy_urb_enqueue (
1087         struct usb_hcd                  *hcd,
1088         struct urb                      *urb,
1089         gfp_t                           mem_flags
1090 ) {
1091         struct dummy_hcd *dum_hcd;
1092         struct urbp     *urbp;
1093         unsigned long   flags;
1094         int             rc;
1095
1096         if (!urb->transfer_buffer && urb->transfer_buffer_length)
1097                 return -EINVAL;
1098
1099         urbp = kmalloc (sizeof *urbp, mem_flags);
1100         if (!urbp)
1101                 return -ENOMEM;
1102         urbp->urb = urb;
1103
1104         dum_hcd = hcd_to_dummy_hcd(hcd);
1105         spin_lock_irqsave(&dum_hcd->dum->lock, flags);
1106         rc = usb_hcd_link_urb_to_ep(hcd, urb);
1107         if (rc) {
1108                 kfree(urbp);
1109                 goto done;
1110         }
1111
1112         if (!dum_hcd->udev) {
1113                 dum_hcd->udev = urb->dev;
1114                 usb_get_dev(dum_hcd->udev);
1115         } else if (unlikely(dum_hcd->udev != urb->dev))
1116                 dev_err(dummy_dev(dum_hcd), "usb_device address has changed!\n");
1117
1118         list_add_tail(&urbp->urbp_list, &dum_hcd->urbp_list);
1119         urb->hcpriv = urbp;
1120         if (usb_pipetype (urb->pipe) == PIPE_CONTROL)
1121                 urb->error_count = 1;           /* mark as a new urb */
1122
1123         /* kick the scheduler, it'll do the rest */
1124         if (!timer_pending(&dum_hcd->timer))
1125                 mod_timer(&dum_hcd->timer, jiffies + 1);
1126
1127  done:
1128         spin_unlock_irqrestore(&dum_hcd->dum->lock, flags);
1129         return rc;
1130 }
1131
1132 static int dummy_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
1133 {
1134         struct dummy_hcd *dum_hcd;
1135         unsigned long   flags;
1136         int             rc;
1137
1138         /* giveback happens automatically in timer callback,
1139          * so make sure the callback happens */
1140         dum_hcd = hcd_to_dummy_hcd(hcd);
1141         spin_lock_irqsave(&dum_hcd->dum->lock, flags);
1142
1143         rc = usb_hcd_check_unlink_urb(hcd, urb, status);
1144         if (!rc && dum_hcd->rh_state != DUMMY_RH_RUNNING &&
1145                         !list_empty(&dum_hcd->urbp_list))
1146                 mod_timer(&dum_hcd->timer, jiffies);
1147
1148         spin_unlock_irqrestore(&dum_hcd->dum->lock, flags);
1149         return rc;
1150 }
1151
1152 /* transfer up to a frame's worth; caller must own lock */
1153 static int
1154 transfer(struct dummy *dum, struct urb *urb, struct dummy_ep *ep, int limit,
1155                 int *status)
1156 {
1157         struct dummy_request    *req;
1158
1159 top:
1160         /* if there's no request queued, the device is NAKing; return */
1161         list_for_each_entry (req, &ep->queue, queue) {
1162                 unsigned        host_len, dev_len, len;
1163                 int             is_short, to_host;
1164                 int             rescan = 0;
1165
1166                 /* 1..N packets of ep->ep.maxpacket each ... the last one
1167                  * may be short (including zero length).
1168                  *
1169                  * writer can send a zlp explicitly (length 0) or implicitly
1170                  * (length mod maxpacket zero, and 'zero' flag); they always
1171                  * terminate reads.
1172                  */
1173                 host_len = urb->transfer_buffer_length - urb->actual_length;
1174                 dev_len = req->req.length - req->req.actual;
1175                 len = min (host_len, dev_len);
1176
1177                 /* FIXME update emulated data toggle too */
1178
1179                 to_host = usb_pipein (urb->pipe);
1180                 if (unlikely (len == 0))
1181                         is_short = 1;
1182                 else {
1183                         char            *ubuf, *rbuf;
1184
1185                         /* not enough bandwidth left? */
1186                         if (limit < ep->ep.maxpacket && limit < len)
1187                                 break;
1188                         len = min (len, (unsigned) limit);
1189                         if (len == 0)
1190                                 break;
1191
1192                         /* use an extra pass for the final short packet */
1193                         if (len > ep->ep.maxpacket) {
1194                                 rescan = 1;
1195                                 len -= (len % ep->ep.maxpacket);
1196                         }
1197                         is_short = (len % ep->ep.maxpacket) != 0;
1198
1199                         /* else transfer packet(s) */
1200                         ubuf = urb->transfer_buffer + urb->actual_length;
1201                         rbuf = req->req.buf + req->req.actual;
1202                         if (to_host)
1203                                 memcpy (ubuf, rbuf, len);
1204                         else
1205                                 memcpy (rbuf, ubuf, len);
1206                         ep->last_io = jiffies;
1207
1208                         limit -= len;
1209                         urb->actual_length += len;
1210                         req->req.actual += len;
1211                 }
1212
1213                 /* short packets terminate, maybe with overflow/underflow.
1214                  * it's only really an error to write too much.
1215                  *
1216                  * partially filling a buffer optionally blocks queue advances
1217                  * (so completion handlers can clean up the queue) but we don't
1218                  * need to emulate such data-in-flight.
1219                  */
1220                 if (is_short) {
1221                         if (host_len == dev_len) {
1222                                 req->req.status = 0;
1223                                 *status = 0;
1224                         } else if (to_host) {
1225                                 req->req.status = 0;
1226                                 if (dev_len > host_len)
1227                                         *status = -EOVERFLOW;
1228                                 else
1229                                         *status = 0;
1230                         } else if (!to_host) {
1231                                 *status = 0;
1232                                 if (host_len > dev_len)
1233                                         req->req.status = -EOVERFLOW;
1234                                 else
1235                                         req->req.status = 0;
1236                         }
1237
1238                 /* many requests terminate without a short packet */
1239                 } else {
1240                         if (req->req.length == req->req.actual
1241                                         && !req->req.zero)
1242                                 req->req.status = 0;
1243                         if (urb->transfer_buffer_length == urb->actual_length
1244                                         && !(urb->transfer_flags
1245                                                 & URB_ZERO_PACKET))
1246                                 *status = 0;
1247                 }
1248
1249                 /* device side completion --> continuable */
1250                 if (req->req.status != -EINPROGRESS) {
1251                         list_del_init (&req->queue);
1252
1253                         spin_unlock (&dum->lock);
1254                         req->req.complete (&ep->ep, &req->req);
1255                         spin_lock (&dum->lock);
1256
1257                         /* requests might have been unlinked... */
1258                         rescan = 1;
1259                 }
1260
1261                 /* host side completion --> terminate */
1262                 if (*status != -EINPROGRESS)
1263                         break;
1264
1265                 /* rescan to continue with any other queued i/o */
1266                 if (rescan)
1267                         goto top;
1268         }
1269         return limit;
1270 }
1271
1272 static int periodic_bytes (struct dummy *dum, struct dummy_ep *ep)
1273 {
1274         int     limit = ep->ep.maxpacket;
1275
1276         if (dum->gadget.speed == USB_SPEED_HIGH) {
1277                 int     tmp;
1278
1279                 /* high bandwidth mode */
1280                 tmp = le16_to_cpu(ep->desc->wMaxPacketSize);
1281                 tmp = (tmp >> 11) & 0x03;
1282                 tmp *= 8 /* applies to entire frame */;
1283                 limit += limit * tmp;
1284         }
1285         if (dum->gadget.speed == USB_SPEED_SUPER) {
1286                 switch (ep->desc->bmAttributes & 0x03) {
1287                 case USB_ENDPOINT_XFER_ISOC:
1288                         /* Sec. 4.4.8.2 USB3.0 Spec */
1289                         limit = 3 * 16 * 1024 * 8;
1290                         break;
1291                 case USB_ENDPOINT_XFER_INT:
1292                         /* Sec. 4.4.7.2 USB3.0 Spec */
1293                         limit = 3 * 1024 * 8;
1294                         break;
1295                 case USB_ENDPOINT_XFER_BULK:
1296                 default:
1297                         break;
1298                 }
1299         }
1300         return limit;
1301 }
1302
1303 #define is_active(dum_hcd)      ((dum_hcd->port_status & \
1304                 (USB_PORT_STAT_CONNECTION | USB_PORT_STAT_ENABLE | \
1305                         USB_PORT_STAT_SUSPEND)) \
1306                 == (USB_PORT_STAT_CONNECTION | USB_PORT_STAT_ENABLE))
1307
1308 static struct dummy_ep *find_endpoint (struct dummy *dum, u8 address)
1309 {
1310         int             i;
1311
1312         if (!is_active((dum->gadget.speed == USB_SPEED_SUPER ?
1313                         dum->ss_hcd : dum->hs_hcd)))
1314                 return NULL;
1315         if ((address & ~USB_DIR_IN) == 0)
1316                 return &dum->ep [0];
1317         for (i = 1; i < DUMMY_ENDPOINTS; i++) {
1318                 struct dummy_ep *ep = &dum->ep [i];
1319
1320                 if (!ep->desc)
1321                         continue;
1322                 if (ep->desc->bEndpointAddress == address)
1323                         return ep;
1324         }
1325         return NULL;
1326 }
1327
1328 #undef is_active
1329
1330 #define Dev_Request     (USB_TYPE_STANDARD | USB_RECIP_DEVICE)
1331 #define Dev_InRequest   (Dev_Request | USB_DIR_IN)
1332 #define Intf_Request    (USB_TYPE_STANDARD | USB_RECIP_INTERFACE)
1333 #define Intf_InRequest  (Intf_Request | USB_DIR_IN)
1334 #define Ep_Request      (USB_TYPE_STANDARD | USB_RECIP_ENDPOINT)
1335 #define Ep_InRequest    (Ep_Request | USB_DIR_IN)
1336
1337
1338 /**
1339  * handle_control_request() - handles all control transfers
1340  * @dum: pointer to dummy (the_controller)
1341  * @urb: the urb request to handle
1342  * @setup: pointer to the setup data for a USB device control
1343  *       request
1344  * @status: pointer to request handling status
1345  *
1346  * Return 0 - if the request was handled
1347  *        1 - if the request wasn't handles
1348  *        error code on error
1349  */
1350 static int handle_control_request(struct dummy_hcd *dum_hcd, struct urb *urb,
1351                                   struct usb_ctrlrequest *setup,
1352                                   int *status)
1353 {
1354         struct dummy_ep         *ep2;
1355         struct dummy            *dum = dum_hcd->dum;
1356         int                     ret_val = 1;
1357         unsigned        w_index;
1358         unsigned        w_value;
1359
1360         w_index = le16_to_cpu(setup->wIndex);
1361         w_value = le16_to_cpu(setup->wValue);
1362         switch (setup->bRequest) {
1363         case USB_REQ_SET_ADDRESS:
1364                 if (setup->bRequestType != Dev_Request)
1365                         break;
1366                 dum->address = w_value;
1367                 *status = 0;
1368                 dev_dbg(udc_dev(dum), "set_address = %d\n",
1369                                 w_value);
1370                 ret_val = 0;
1371                 break;
1372         case USB_REQ_SET_FEATURE:
1373                 if (setup->bRequestType == Dev_Request) {
1374                         ret_val = 0;
1375                         switch (w_value) {
1376                         case USB_DEVICE_REMOTE_WAKEUP:
1377                                 break;
1378                         case USB_DEVICE_B_HNP_ENABLE:
1379                                 dum->gadget.b_hnp_enable = 1;
1380                                 break;
1381                         case USB_DEVICE_A_HNP_SUPPORT:
1382                                 dum->gadget.a_hnp_support = 1;
1383                                 break;
1384                         case USB_DEVICE_A_ALT_HNP_SUPPORT:
1385                                 dum->gadget.a_alt_hnp_support = 1;
1386                                 break;
1387                         case USB_DEVICE_U1_ENABLE:
1388                                 if (dummy_hcd_to_hcd(dum_hcd)->speed ==
1389                                     HCD_USB3)
1390                                         w_value = USB_DEV_STAT_U1_ENABLED;
1391                                 else
1392                                         ret_val = -EOPNOTSUPP;
1393                                 break;
1394                         case USB_DEVICE_U2_ENABLE:
1395                                 if (dummy_hcd_to_hcd(dum_hcd)->speed ==
1396                                     HCD_USB3)
1397                                         w_value = USB_DEV_STAT_U2_ENABLED;
1398                                 else
1399                                         ret_val = -EOPNOTSUPP;
1400                                 break;
1401                         case USB_DEVICE_LTM_ENABLE:
1402                                 if (dummy_hcd_to_hcd(dum_hcd)->speed ==
1403                                     HCD_USB3)
1404                                         w_value = USB_DEV_STAT_LTM_ENABLED;
1405                                 else
1406                                         ret_val = -EOPNOTSUPP;
1407                                 break;
1408                         default:
1409                                 ret_val = -EOPNOTSUPP;
1410                         }
1411                         if (ret_val == 0) {
1412                                 dum->devstatus |= (1 << w_value);
1413                                 *status = 0;
1414                         }
1415                 } else if (setup->bRequestType == Ep_Request) {
1416                         /* endpoint halt */
1417                         ep2 = find_endpoint(dum, w_index);
1418                         if (!ep2 || ep2->ep.name == ep0name) {
1419                                 ret_val = -EOPNOTSUPP;
1420                                 break;
1421                         }
1422                         ep2->halted = 1;
1423                         ret_val = 0;
1424                         *status = 0;
1425                 }
1426                 break;
1427         case USB_REQ_CLEAR_FEATURE:
1428                 if (setup->bRequestType == Dev_Request) {
1429                         ret_val = 0;
1430                         switch (w_value) {
1431                         case USB_DEVICE_REMOTE_WAKEUP:
1432                                 w_value = USB_DEVICE_REMOTE_WAKEUP;
1433                                 break;
1434                         case USB_DEVICE_U1_ENABLE:
1435                                 if (dummy_hcd_to_hcd(dum_hcd)->speed ==
1436                                     HCD_USB3)
1437                                         w_value = USB_DEV_STAT_U1_ENABLED;
1438                                 else
1439                                         ret_val = -EOPNOTSUPP;
1440                                 break;
1441                         case USB_DEVICE_U2_ENABLE:
1442                                 if (dummy_hcd_to_hcd(dum_hcd)->speed ==
1443                                     HCD_USB3)
1444                                         w_value = USB_DEV_STAT_U2_ENABLED;
1445                                 else
1446                                         ret_val = -EOPNOTSUPP;
1447                                 break;
1448                         case USB_DEVICE_LTM_ENABLE:
1449                                 if (dummy_hcd_to_hcd(dum_hcd)->speed ==
1450                                     HCD_USB3)
1451                                         w_value = USB_DEV_STAT_LTM_ENABLED;
1452                                 else
1453                                         ret_val = -EOPNOTSUPP;
1454                                 break;
1455                         default:
1456                                 ret_val = -EOPNOTSUPP;
1457                                 break;
1458                         }
1459                         if (ret_val == 0) {
1460                                 dum->devstatus &= ~(1 << w_value);
1461                                 *status = 0;
1462                         }
1463                 } else if (setup->bRequestType == Ep_Request) {
1464                         /* endpoint halt */
1465                         ep2 = find_endpoint(dum, w_index);
1466                         if (!ep2) {
1467                                 ret_val = -EOPNOTSUPP;
1468                                 break;
1469                         }
1470                         if (!ep2->wedged)
1471                                 ep2->halted = 0;
1472                         ret_val = 0;
1473                         *status = 0;
1474                 }
1475                 break;
1476         case USB_REQ_GET_STATUS:
1477                 if (setup->bRequestType == Dev_InRequest
1478                                 || setup->bRequestType == Intf_InRequest
1479                                 || setup->bRequestType == Ep_InRequest) {
1480                         char *buf;
1481                         /*
1482                          * device: remote wakeup, selfpowered
1483                          * interface: nothing
1484                          * endpoint: halt
1485                          */
1486                         buf = (char *)urb->transfer_buffer;
1487                         if (urb->transfer_buffer_length > 0) {
1488                                 if (setup->bRequestType == Ep_InRequest) {
1489                                         ep2 = find_endpoint(dum, w_index);
1490                                         if (!ep2) {
1491                                                 ret_val = -EOPNOTSUPP;
1492                                                 break;
1493                                         }
1494                                         buf[0] = ep2->halted;
1495                                 } else if (setup->bRequestType ==
1496                                            Dev_InRequest) {
1497                                         buf[0] = (u8)dum->devstatus;
1498                                 } else
1499                                         buf[0] = 0;
1500                         }
1501                         if (urb->transfer_buffer_length > 1)
1502                                 buf[1] = 0;
1503                         urb->actual_length = min_t(u32, 2,
1504                                 urb->transfer_buffer_length);
1505                         ret_val = 0;
1506                         *status = 0;
1507                 }
1508                 break;
1509         }
1510         return ret_val;
1511 }
1512
1513 /* drive both sides of the transfers; looks like irq handlers to
1514  * both drivers except the callbacks aren't in_irq().
1515  */
1516 static void dummy_timer(unsigned long _dum_hcd)
1517 {
1518         struct dummy_hcd        *dum_hcd = (struct dummy_hcd *) _dum_hcd;
1519         struct dummy            *dum = dum_hcd->dum;
1520         struct urbp             *urbp, *tmp;
1521         unsigned long           flags;
1522         int                     limit, total;
1523         int                     i;
1524
1525         /* simplistic model for one frame's bandwidth */
1526         switch (dum->gadget.speed) {
1527         case USB_SPEED_LOW:
1528                 total = 8/*bytes*/ * 12/*packets*/;
1529                 break;
1530         case USB_SPEED_FULL:
1531                 total = 64/*bytes*/ * 19/*packets*/;
1532                 break;
1533         case USB_SPEED_HIGH:
1534                 total = 512/*bytes*/ * 13/*packets*/ * 8/*uframes*/;
1535                 break;
1536         case USB_SPEED_SUPER:
1537                 /* Bus speed is 500000 bytes/ms, so use a little less */
1538                 total = 490000;
1539                 break;
1540         default:
1541                 dev_err(dummy_dev(dum_hcd), "bogus device speed\n");
1542                 return;
1543         }
1544
1545         /* FIXME if HZ != 1000 this will probably misbehave ... */
1546
1547         /* look at each urb queued by the host side driver */
1548         spin_lock_irqsave (&dum->lock, flags);
1549
1550         if (!dum_hcd->udev) {
1551                 dev_err(dummy_dev(dum_hcd),
1552                                 "timer fired with no URBs pending?\n");
1553                 spin_unlock_irqrestore (&dum->lock, flags);
1554                 return;
1555         }
1556
1557         for (i = 0; i < DUMMY_ENDPOINTS; i++) {
1558                 if (!ep_name [i])
1559                         break;
1560                 dum->ep [i].already_seen = 0;
1561         }
1562
1563 restart:
1564         list_for_each_entry_safe(urbp, tmp, &dum_hcd->urbp_list, urbp_list) {
1565                 struct urb              *urb;
1566                 struct dummy_request    *req;
1567                 u8                      address;
1568                 struct dummy_ep         *ep = NULL;
1569                 int                     type;
1570                 int                     status = -EINPROGRESS;
1571
1572                 urb = urbp->urb;
1573                 if (urb->unlinked)
1574                         goto return_urb;
1575                 else if (dum_hcd->rh_state != DUMMY_RH_RUNNING)
1576                         continue;
1577                 type = usb_pipetype (urb->pipe);
1578
1579                 /* used up this frame's non-periodic bandwidth?
1580                  * FIXME there's infinite bandwidth for control and
1581                  * periodic transfers ... unrealistic.
1582                  */
1583                 if (total <= 0 && type == PIPE_BULK)
1584                         continue;
1585
1586                 /* find the gadget's ep for this request (if configured) */
1587                 address = usb_pipeendpoint (urb->pipe);
1588                 if (usb_pipein (urb->pipe))
1589                         address |= USB_DIR_IN;
1590                 ep = find_endpoint(dum, address);
1591                 if (!ep) {
1592                         /* set_configuration() disagreement */
1593                         dev_dbg(dummy_dev(dum_hcd),
1594                                 "no ep configured for urb %p\n",
1595                                 urb);
1596                         status = -EPROTO;
1597                         goto return_urb;
1598                 }
1599
1600                 if (ep->already_seen)
1601                         continue;
1602                 ep->already_seen = 1;
1603                 if (ep == &dum->ep [0] && urb->error_count) {
1604                         ep->setup_stage = 1;    /* a new urb */
1605                         urb->error_count = 0;
1606                 }
1607                 if (ep->halted && !ep->setup_stage) {
1608                         /* NOTE: must not be iso! */
1609                         dev_dbg(dummy_dev(dum_hcd), "ep %s halted, urb %p\n",
1610                                         ep->ep.name, urb);
1611                         status = -EPIPE;
1612                         goto return_urb;
1613                 }
1614                 /* FIXME make sure both ends agree on maxpacket */
1615
1616                 /* handle control requests */
1617                 if (ep == &dum->ep [0] && ep->setup_stage) {
1618                         struct usb_ctrlrequest          setup;
1619                         int                             value = 1;
1620
1621                         setup = *(struct usb_ctrlrequest*) urb->setup_packet;
1622                         /* paranoia, in case of stale queued data */
1623                         list_for_each_entry (req, &ep->queue, queue) {
1624                                 list_del_init (&req->queue);
1625                                 req->req.status = -EOVERFLOW;
1626                                 dev_dbg (udc_dev(dum), "stale req = %p\n",
1627                                                 req);
1628
1629                                 spin_unlock (&dum->lock);
1630                                 req->req.complete (&ep->ep, &req->req);
1631                                 spin_lock (&dum->lock);
1632                                 ep->already_seen = 0;
1633                                 goto restart;
1634                         }
1635
1636                         /* gadget driver never sees set_address or operations
1637                          * on standard feature flags.  some hardware doesn't
1638                          * even expose them.
1639                          */
1640                         ep->last_io = jiffies;
1641                         ep->setup_stage = 0;
1642                         ep->halted = 0;
1643
1644                         value = handle_control_request(dum_hcd, urb, &setup,
1645                                                        &status);
1646
1647                         /* gadget driver handles all other requests.  block
1648                          * until setup() returns; no reentrancy issues etc.
1649                          */
1650                         if (value > 0) {
1651                                 spin_unlock (&dum->lock);
1652                                 value = dum->driver->setup (&dum->gadget,
1653                                                 &setup);
1654                                 spin_lock (&dum->lock);
1655
1656                                 if (value >= 0) {
1657                                         /* no delays (max 64KB data stage) */
1658                                         limit = 64*1024;
1659                                         goto treat_control_like_bulk;
1660                                 }
1661                                 /* error, see below */
1662                         }
1663
1664                         if (value < 0) {
1665                                 if (value != -EOPNOTSUPP)
1666                                         dev_dbg (udc_dev(dum),
1667                                                 "setup --> %d\n",
1668                                                 value);
1669                                 status = -EPIPE;
1670                                 urb->actual_length = 0;
1671                         }
1672
1673                         goto return_urb;
1674                 }
1675
1676                 /* non-control requests */
1677                 limit = total;
1678                 switch (usb_pipetype (urb->pipe)) {
1679                 case PIPE_ISOCHRONOUS:
1680                         /* FIXME is it urb->interval since the last xfer?
1681                          * use urb->iso_frame_desc[i].
1682                          * complete whether or not ep has requests queued.
1683                          * report random errors, to debug drivers.
1684                          */
1685                         limit = max (limit, periodic_bytes (dum, ep));
1686                         status = -ENOSYS;
1687                         break;
1688
1689                 case PIPE_INTERRUPT:
1690                         /* FIXME is it urb->interval since the last xfer?
1691                          * this almost certainly polls too fast.
1692                          */
1693                         limit = max (limit, periodic_bytes (dum, ep));
1694                         /* FALLTHROUGH */
1695
1696                 // case PIPE_BULK:  case PIPE_CONTROL:
1697                 default:
1698                 treat_control_like_bulk:
1699                         ep->last_io = jiffies;
1700                         total = transfer(dum, urb, ep, limit, &status);
1701                         break;
1702                 }
1703
1704                 /* incomplete transfer? */
1705                 if (status == -EINPROGRESS)
1706                         continue;
1707
1708 return_urb:
1709                 list_del (&urbp->urbp_list);
1710                 kfree (urbp);
1711                 if (ep)
1712                         ep->already_seen = ep->setup_stage = 0;
1713
1714                 usb_hcd_unlink_urb_from_ep(dummy_hcd_to_hcd(dum_hcd), urb);
1715                 spin_unlock (&dum->lock);
1716                 usb_hcd_giveback_urb(dummy_hcd_to_hcd(dum_hcd), urb, status);
1717                 spin_lock (&dum->lock);
1718
1719                 goto restart;
1720         }
1721
1722         if (list_empty(&dum_hcd->urbp_list)) {
1723                 usb_put_dev(dum_hcd->udev);
1724                 dum_hcd->udev = NULL;
1725         } else if (dum_hcd->rh_state == DUMMY_RH_RUNNING) {
1726                 /* want a 1 msec delay here */
1727                 mod_timer(&dum_hcd->timer, jiffies + msecs_to_jiffies(1));
1728         }
1729
1730         spin_unlock_irqrestore (&dum->lock, flags);
1731 }
1732
1733 /*-------------------------------------------------------------------------*/
1734
1735 #define PORT_C_MASK \
1736         ((USB_PORT_STAT_C_CONNECTION \
1737         | USB_PORT_STAT_C_ENABLE \
1738         | USB_PORT_STAT_C_SUSPEND \
1739         | USB_PORT_STAT_C_OVERCURRENT \
1740         | USB_PORT_STAT_C_RESET) << 16)
1741
1742 static int dummy_hub_status (struct usb_hcd *hcd, char *buf)
1743 {
1744         struct dummy_hcd        *dum_hcd;
1745         unsigned long           flags;
1746         int                     retval = 0;
1747
1748         dum_hcd = hcd_to_dummy_hcd(hcd);
1749
1750         spin_lock_irqsave(&dum_hcd->dum->lock, flags);
1751         if (!HCD_HW_ACCESSIBLE(hcd))
1752                 goto done;
1753
1754         if (dum_hcd->resuming && time_after_eq(jiffies, dum_hcd->re_timeout)) {
1755                 dum_hcd->port_status |= (USB_PORT_STAT_C_SUSPEND << 16);
1756                 dum_hcd->port_status &= ~USB_PORT_STAT_SUSPEND;
1757                 set_link_state(dum_hcd);
1758         }
1759
1760         if ((dum_hcd->port_status & PORT_C_MASK) != 0) {
1761                 *buf = (1 << 1);
1762                 dev_dbg(dummy_dev(dum_hcd), "port status 0x%08x has changes\n",
1763                                 dum_hcd->port_status);
1764                 retval = 1;
1765                 if (dum_hcd->rh_state == DUMMY_RH_SUSPENDED)
1766                         usb_hcd_resume_root_hub (hcd);
1767         }
1768 done:
1769         spin_unlock_irqrestore(&dum_hcd->dum->lock, flags);
1770         return retval;
1771 }
1772
1773 static inline void
1774 ss_hub_descriptor(struct usb_hub_descriptor *desc)
1775 {
1776         memset(desc, 0, sizeof *desc);
1777         desc->bDescriptorType = 0x2a;
1778         desc->bDescLength = 12;
1779         desc->wHubCharacteristics = cpu_to_le16(0x0001);
1780         desc->bNbrPorts = 1;
1781         desc->u.ss.bHubHdrDecLat = 0x04; /* Worst case: 0.4 micro sec*/
1782         desc->u.ss.DeviceRemovable = 0xffff;
1783 }
1784
1785 static inline void
1786 hub_descriptor (struct usb_hub_descriptor *desc)
1787 {
1788         memset (desc, 0, sizeof *desc);
1789         desc->bDescriptorType = 0x29;
1790         desc->bDescLength = 9;
1791         desc->wHubCharacteristics = cpu_to_le16(0x0001);
1792         desc->bNbrPorts = 1;
1793         desc->u.hs.DeviceRemovable[0] = 0xff;
1794         desc->u.hs.DeviceRemovable[1] = 0xff;
1795 }
1796
1797 static int dummy_hub_control (
1798         struct usb_hcd  *hcd,
1799         u16             typeReq,
1800         u16             wValue,
1801         u16             wIndex,
1802         char            *buf,
1803         u16             wLength
1804 ) {
1805         struct dummy_hcd *dum_hcd;
1806         int             retval = 0;
1807         unsigned long   flags;
1808
1809         if (!HCD_HW_ACCESSIBLE(hcd))
1810                 return -ETIMEDOUT;
1811
1812         dum_hcd = hcd_to_dummy_hcd(hcd);
1813
1814         spin_lock_irqsave(&dum_hcd->dum->lock, flags);
1815         switch (typeReq) {
1816         case ClearHubFeature:
1817                 break;
1818         case ClearPortFeature:
1819                 switch (wValue) {
1820                 case USB_PORT_FEAT_SUSPEND:
1821                         if (hcd->speed == HCD_USB3) {
1822                                 dev_dbg(dummy_dev(dum_hcd),
1823                                          "USB_PORT_FEAT_SUSPEND req not "
1824                                          "supported for USB 3.0 roothub\n");
1825                                 goto error;
1826                         }
1827                         if (dum_hcd->port_status & USB_PORT_STAT_SUSPEND) {
1828                                 /* 20msec resume signaling */
1829                                 dum_hcd->resuming = 1;
1830                                 dum_hcd->re_timeout = jiffies +
1831                                                 msecs_to_jiffies(20);
1832                         }
1833                         break;
1834                 case USB_PORT_FEAT_POWER:
1835                         if (hcd->speed == HCD_USB3) {
1836                                 if (dum_hcd->port_status & USB_PORT_STAT_POWER)
1837                                         dev_dbg(dummy_dev(dum_hcd),
1838                                                 "power-off\n");
1839                         } else
1840                                 if (dum_hcd->port_status &
1841                                                         USB_SS_PORT_STAT_POWER)
1842                                         dev_dbg(dummy_dev(dum_hcd),
1843                                                 "power-off\n");
1844                         /* FALLS THROUGH */
1845                 default:
1846                         dum_hcd->port_status &= ~(1 << wValue);
1847                         set_link_state(dum_hcd);
1848                 }
1849                 break;
1850         case GetHubDescriptor:
1851                 if (hcd->speed == HCD_USB3 &&
1852                                 (wLength < USB_DT_SS_HUB_SIZE ||
1853                                  wValue != (USB_DT_SS_HUB << 8))) {
1854                         dev_dbg(dummy_dev(dum_hcd),
1855                                 "Wrong hub descriptor type for "
1856                                 "USB 3.0 roothub.\n");
1857                         goto error;
1858                 }
1859                 if (hcd->speed == HCD_USB3)
1860                         ss_hub_descriptor((struct usb_hub_descriptor *) buf);
1861                 else
1862                         hub_descriptor((struct usb_hub_descriptor *) buf);
1863                 break;
1864         case GetHubStatus:
1865                 *(__le32 *) buf = cpu_to_le32 (0);
1866                 break;
1867         case GetPortStatus:
1868                 if (wIndex != 1)
1869                         retval = -EPIPE;
1870
1871                 /* whoever resets or resumes must GetPortStatus to
1872                  * complete it!!
1873                  */
1874                 if (dum_hcd->resuming &&
1875                                 time_after_eq(jiffies, dum_hcd->re_timeout)) {
1876                         dum_hcd->port_status |= (USB_PORT_STAT_C_SUSPEND << 16);
1877                         dum_hcd->port_status &= ~USB_PORT_STAT_SUSPEND;
1878                 }
1879                 if ((dum_hcd->port_status & USB_PORT_STAT_RESET) != 0 &&
1880                                 time_after_eq(jiffies, dum_hcd->re_timeout)) {
1881                         dum_hcd->port_status |= (USB_PORT_STAT_C_RESET << 16);
1882                         dum_hcd->port_status &= ~USB_PORT_STAT_RESET;
1883                         if (dum_hcd->dum->pullup) {
1884                                 dum_hcd->port_status |= USB_PORT_STAT_ENABLE;
1885
1886                                 if (hcd->speed < HCD_USB3) {
1887                                         switch (dum_hcd->dum->gadget.speed) {
1888                                         case USB_SPEED_HIGH:
1889                                                 dum_hcd->port_status |=
1890                                                       USB_PORT_STAT_HIGH_SPEED;
1891                                                 break;
1892                                         case USB_SPEED_LOW:
1893                                                 dum_hcd->dum->gadget.ep0->
1894                                                         maxpacket = 8;
1895                                                 dum_hcd->port_status |=
1896                                                         USB_PORT_STAT_LOW_SPEED;
1897                                                 break;
1898                                         default:
1899                                                 dum_hcd->dum->gadget.speed =
1900                                                         USB_SPEED_FULL;
1901                                                 break;
1902                                         }
1903                                 }
1904                         }
1905                 }
1906                 set_link_state(dum_hcd);
1907                 ((__le16 *) buf)[0] = cpu_to_le16 (dum_hcd->port_status);
1908                 ((__le16 *) buf)[1] = cpu_to_le16 (dum_hcd->port_status >> 16);
1909                 break;
1910         case SetHubFeature:
1911                 retval = -EPIPE;
1912                 break;
1913         case SetPortFeature:
1914                 switch (wValue) {
1915                 case USB_PORT_FEAT_LINK_STATE:
1916                         if (hcd->speed != HCD_USB3) {
1917                                 dev_dbg(dummy_dev(dum_hcd),
1918                                          "USB_PORT_FEAT_LINK_STATE req not "
1919                                          "supported for USB 2.0 roothub\n");
1920                                 goto error;
1921                         }
1922                         /*
1923                          * Since this is dummy we don't have an actual link so
1924                          * there is nothing to do for the SET_LINK_STATE cmd
1925                          */
1926                         break;
1927                 case USB_PORT_FEAT_U1_TIMEOUT:
1928                 case USB_PORT_FEAT_U2_TIMEOUT:
1929                         /* TODO: add suspend/resume support! */
1930                         if (hcd->speed != HCD_USB3) {
1931                                 dev_dbg(dummy_dev(dum_hcd),
1932                                          "USB_PORT_FEAT_U1/2_TIMEOUT req not "
1933                                          "supported for USB 2.0 roothub\n");
1934                                 goto error;
1935                         }
1936                         break;
1937                 case USB_PORT_FEAT_SUSPEND:
1938                         /* Applicable only for USB2.0 hub */
1939                         if (hcd->speed == HCD_USB3) {
1940                                 dev_dbg(dummy_dev(dum_hcd),
1941                                          "USB_PORT_FEAT_SUSPEND req not "
1942                                          "supported for USB 3.0 roothub\n");
1943                                 goto error;
1944                         }
1945                         if (dum_hcd->active) {
1946                                 dum_hcd->port_status |= USB_PORT_STAT_SUSPEND;
1947
1948                                 /* HNP would happen here; for now we
1949                                  * assume b_bus_req is always true.
1950                                  */
1951                                 set_link_state(dum_hcd);
1952                                 if (((1 << USB_DEVICE_B_HNP_ENABLE)
1953                                                 & dum_hcd->dum->devstatus) != 0)
1954                                         dev_dbg(dummy_dev(dum_hcd),
1955                                                         "no HNP yet!\n");
1956                         }
1957                         break;
1958                 case USB_PORT_FEAT_POWER:
1959                         if (hcd->speed == HCD_USB3)
1960                                 dum_hcd->port_status |= USB_SS_PORT_STAT_POWER;
1961                         else
1962                                 dum_hcd->port_status |= USB_PORT_STAT_POWER;
1963                         set_link_state(dum_hcd);
1964                         break;
1965                 case USB_PORT_FEAT_BH_PORT_RESET:
1966                         /* Applicable only for USB3.0 hub */
1967                         if (hcd->speed != HCD_USB3) {
1968                                 dev_dbg(dummy_dev(dum_hcd),
1969                                          "USB_PORT_FEAT_BH_PORT_RESET req not "
1970                                          "supported for USB 2.0 roothub\n");
1971                                 goto error;
1972                         }
1973                         /* FALLS THROUGH */
1974                 case USB_PORT_FEAT_RESET:
1975                         /* if it's already enabled, disable */
1976                         if (hcd->speed == HCD_USB3) {
1977                                 dum_hcd->port_status = 0;
1978                                 dum_hcd->port_status =
1979                                         (USB_SS_PORT_STAT_POWER |
1980                                          USB_PORT_STAT_CONNECTION |
1981                                          USB_PORT_STAT_RESET);
1982                         } else
1983                                 dum_hcd->port_status &= ~(USB_PORT_STAT_ENABLE
1984                                         | USB_PORT_STAT_LOW_SPEED
1985                                         | USB_PORT_STAT_HIGH_SPEED);
1986                         /*
1987                          * We want to reset device status. All but the
1988                          * Self powered feature
1989                          */
1990                         dum_hcd->dum->devstatus &=
1991                                 (1 << USB_DEVICE_SELF_POWERED);
1992                         /*
1993                          * FIXME USB3.0: what is the correct reset signaling
1994                          * interval? Is it still 50msec as for HS?
1995                          */
1996                         dum_hcd->re_timeout = jiffies + msecs_to_jiffies(50);
1997                         /* FALLS THROUGH */
1998                 default:
1999                         if (hcd->speed == HCD_USB3) {
2000                                 if ((dum_hcd->port_status &
2001                                      USB_SS_PORT_STAT_POWER) != 0) {
2002                                         dum_hcd->port_status |= (1 << wValue);
2003                                         set_link_state(dum_hcd);
2004                                 }
2005                         } else
2006                                 if ((dum_hcd->port_status &
2007                                      USB_PORT_STAT_POWER) != 0) {
2008                                         dum_hcd->port_status |= (1 << wValue);
2009                                         set_link_state(dum_hcd);
2010                                 }
2011                 }
2012                 break;
2013         case GetPortErrorCount:
2014                 if (hcd->speed != HCD_USB3) {
2015                         dev_dbg(dummy_dev(dum_hcd),
2016                                  "GetPortErrorCount req not "
2017                                  "supported for USB 2.0 roothub\n");
2018                         goto error;
2019                 }
2020                 /* We'll always return 0 since this is a dummy hub */
2021                 *(__le32 *) buf = cpu_to_le32(0);
2022                 break;
2023         case SetHubDepth:
2024                 if (hcd->speed != HCD_USB3) {
2025                         dev_dbg(dummy_dev(dum_hcd),
2026                                  "SetHubDepth req not supported for "
2027                                  "USB 2.0 roothub\n");
2028                         goto error;
2029                 }
2030                 break;
2031         default:
2032                 dev_dbg(dummy_dev(dum_hcd),
2033                         "hub control req%04x v%04x i%04x l%d\n",
2034                         typeReq, wValue, wIndex, wLength);
2035 error:
2036                 /* "protocol stall" on error */
2037                 retval = -EPIPE;
2038         }
2039         spin_unlock_irqrestore(&dum_hcd->dum->lock, flags);
2040
2041         if ((dum_hcd->port_status & PORT_C_MASK) != 0)
2042                 usb_hcd_poll_rh_status (hcd);
2043         return retval;
2044 }
2045
2046 static int dummy_bus_suspend (struct usb_hcd *hcd)
2047 {
2048         struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd);
2049
2050         dev_dbg (&hcd->self.root_hub->dev, "%s\n", __func__);
2051
2052         spin_lock_irq(&dum_hcd->dum->lock);
2053         dum_hcd->rh_state = DUMMY_RH_SUSPENDED;
2054         set_link_state(dum_hcd);
2055         hcd->state = HC_STATE_SUSPENDED;
2056         spin_unlock_irq(&dum_hcd->dum->lock);
2057         return 0;
2058 }
2059
2060 static int dummy_bus_resume (struct usb_hcd *hcd)
2061 {
2062         struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd);
2063         int rc = 0;
2064
2065         dev_dbg (&hcd->self.root_hub->dev, "%s\n", __func__);
2066
2067         spin_lock_irq(&dum_hcd->dum->lock);
2068         if (!HCD_HW_ACCESSIBLE(hcd)) {
2069                 rc = -ESHUTDOWN;
2070         } else {
2071                 dum_hcd->rh_state = DUMMY_RH_RUNNING;
2072                 set_link_state(dum_hcd);
2073                 if (!list_empty(&dum_hcd->urbp_list))
2074                         mod_timer(&dum_hcd->timer, jiffies);
2075                 hcd->state = HC_STATE_RUNNING;
2076         }
2077         spin_unlock_irq(&dum_hcd->dum->lock);
2078         return rc;
2079 }
2080
2081 /*-------------------------------------------------------------------------*/
2082
2083 static inline ssize_t
2084 show_urb (char *buf, size_t size, struct urb *urb)
2085 {
2086         int ep = usb_pipeendpoint (urb->pipe);
2087
2088         return snprintf (buf, size,
2089                 "urb/%p %s ep%d%s%s len %d/%d\n",
2090                 urb,
2091                 ({ char *s;
2092                  switch (urb->dev->speed) {
2093                  case USB_SPEED_LOW:
2094                         s = "ls";
2095                         break;
2096                  case USB_SPEED_FULL:
2097                         s = "fs";
2098                         break;
2099                  case USB_SPEED_HIGH:
2100                         s = "hs";
2101                         break;
2102                  case USB_SPEED_SUPER:
2103                         s = "ss";
2104                         break;
2105                  default:
2106                         s = "?";
2107                         break;
2108                  }; s; }),
2109                 ep, ep ? (usb_pipein (urb->pipe) ? "in" : "out") : "",
2110                 ({ char *s; \
2111                  switch (usb_pipetype (urb->pipe)) { \
2112                  case PIPE_CONTROL: \
2113                         s = ""; \
2114                         break; \
2115                  case PIPE_BULK: \
2116                         s = "-bulk"; \
2117                         break; \
2118                  case PIPE_INTERRUPT: \
2119                         s = "-int"; \
2120                         break; \
2121                  default: \
2122                         s = "-iso"; \
2123                         break; \
2124                 }; s;}),
2125                 urb->actual_length, urb->transfer_buffer_length);
2126 }
2127
2128 static ssize_t
2129 show_urbs (struct device *dev, struct device_attribute *attr, char *buf)
2130 {
2131         struct usb_hcd          *hcd = dev_get_drvdata (dev);
2132         struct dummy_hcd        *dum_hcd = hcd_to_dummy_hcd(hcd);
2133         struct urbp             *urbp;
2134         size_t                  size = 0;
2135         unsigned long           flags;
2136
2137         spin_lock_irqsave(&dum_hcd->dum->lock, flags);
2138         list_for_each_entry(urbp, &dum_hcd->urbp_list, urbp_list) {
2139                 size_t          temp;
2140
2141                 temp = show_urb (buf, PAGE_SIZE - size, urbp->urb);
2142                 buf += temp;
2143                 size += temp;
2144         }
2145         spin_unlock_irqrestore(&dum_hcd->dum->lock, flags);
2146
2147         return size;
2148 }
2149 static DEVICE_ATTR (urbs, S_IRUGO, show_urbs, NULL);
2150
2151 static int dummy_start_ss(struct dummy_hcd *dum_hcd)
2152 {
2153         init_timer(&dum_hcd->timer);
2154         dum_hcd->timer.function = dummy_timer;
2155         dum_hcd->timer.data = (unsigned long)dum_hcd;
2156         dum_hcd->rh_state = DUMMY_RH_RUNNING;
2157         INIT_LIST_HEAD(&dum_hcd->urbp_list);
2158         dummy_hcd_to_hcd(dum_hcd)->power_budget = POWER_BUDGET;
2159         dummy_hcd_to_hcd(dum_hcd)->state = HC_STATE_RUNNING;
2160         dummy_hcd_to_hcd(dum_hcd)->uses_new_polling = 1;
2161 #ifdef CONFIG_USB_OTG
2162         dummy_hcd_to_hcd(dum_hcd)->self.otg_port = 1;
2163 #endif
2164         return 0;
2165
2166         /* FIXME 'urbs' should be a per-device thing, maybe in usbcore */
2167         return device_create_file(dummy_dev(dum_hcd), &dev_attr_urbs);
2168 }
2169
2170 static int dummy_start(struct usb_hcd *hcd)
2171 {
2172         struct dummy_hcd        *dum_hcd = hcd_to_dummy_hcd(hcd);
2173
2174         /*
2175          * MASTER side init ... we emulate a root hub that'll only ever
2176          * talk to one device (the slave side).  Also appears in sysfs,
2177          * just like more familiar pci-based HCDs.
2178          */
2179         if (!usb_hcd_is_primary_hcd(hcd))
2180                 return dummy_start_ss(dum_hcd);
2181
2182         spin_lock_init(&dum_hcd->dum->lock);
2183         init_timer(&dum_hcd->timer);
2184         dum_hcd->timer.function = dummy_timer;
2185         dum_hcd->timer.data = (unsigned long)dum_hcd;
2186         dum_hcd->rh_state = DUMMY_RH_RUNNING;
2187
2188         INIT_LIST_HEAD(&dum_hcd->urbp_list);
2189
2190         hcd->power_budget = POWER_BUDGET;
2191         hcd->state = HC_STATE_RUNNING;
2192         hcd->uses_new_polling = 1;
2193
2194 #ifdef CONFIG_USB_OTG
2195         hcd->self.otg_port = 1;
2196 #endif
2197
2198         /* FIXME 'urbs' should be a per-device thing, maybe in usbcore */
2199         return device_create_file(dummy_dev(dum_hcd), &dev_attr_urbs);
2200 }
2201
2202 static void dummy_stop (struct usb_hcd *hcd)
2203 {
2204         struct dummy            *dum;
2205
2206         dum = (hcd_to_dummy_hcd(hcd))->dum;
2207         device_remove_file(dummy_dev(hcd_to_dummy_hcd(hcd)), &dev_attr_urbs);
2208         usb_gadget_unregister_driver(dum->driver);
2209         dev_info(dummy_dev(hcd_to_dummy_hcd(hcd)), "stopped\n");
2210 }
2211
2212 /*-------------------------------------------------------------------------*/
2213
2214 static int dummy_h_get_frame (struct usb_hcd *hcd)
2215 {
2216         return dummy_g_get_frame (NULL);
2217 }
2218
2219 static int dummy_setup(struct usb_hcd *hcd)
2220 {
2221         if (usb_hcd_is_primary_hcd(hcd)) {
2222                 the_controller.hs_hcd = hcd_to_dummy_hcd(hcd);
2223                 the_controller.hs_hcd->dum = &the_controller;
2224                 /*
2225                  * Mark the first roothub as being USB 2.0.
2226                  * The USB 3.0 roothub will be registered later by
2227                  * dummy_hcd_probe()
2228                  */
2229                 hcd->speed = HCD_USB2;
2230                 hcd->self.root_hub->speed = USB_SPEED_HIGH;
2231         } else {
2232                 the_controller.ss_hcd = hcd_to_dummy_hcd(hcd);
2233                 the_controller.ss_hcd->dum = &the_controller;
2234                 hcd->speed = HCD_USB3;
2235                 hcd->self.root_hub->speed = USB_SPEED_SUPER;
2236         }
2237         return 0;
2238 }
2239
2240 /* Change a group of bulk endpoints to support multiple stream IDs */
2241 int dummy_alloc_streams(struct usb_hcd *hcd, struct usb_device *udev,
2242         struct usb_host_endpoint **eps, unsigned int num_eps,
2243         unsigned int num_streams, gfp_t mem_flags)
2244 {
2245         if (hcd->speed != HCD_USB3)
2246                 dev_dbg(dummy_dev(hcd_to_dummy_hcd(hcd)),
2247                         "%s() - ERROR! Not supported for USB2.0 roothub\n",
2248                         __func__);
2249         return 0;
2250 }
2251
2252 /* Reverts a group of bulk endpoints back to not using stream IDs. */
2253 int dummy_free_streams(struct usb_hcd *hcd, struct usb_device *udev,
2254         struct usb_host_endpoint **eps, unsigned int num_eps,
2255         gfp_t mem_flags)
2256 {
2257         if (hcd->speed != HCD_USB3)
2258                 dev_dbg(dummy_dev(hcd_to_dummy_hcd(hcd)),
2259                         "%s() - ERROR! Not supported for USB2.0 roothub\n",
2260                         __func__);
2261         return 0;
2262 }
2263
2264 static struct hc_driver dummy_hcd = {
2265         .description =          (char *) driver_name,
2266         .product_desc =         "Dummy host controller",
2267         .hcd_priv_size =        sizeof(struct dummy_hcd),
2268
2269         .flags =                HCD_USB3 | HCD_SHARED,
2270
2271         .reset =                dummy_setup,
2272         .start =                dummy_start,
2273         .stop =                 dummy_stop,
2274
2275         .urb_enqueue =          dummy_urb_enqueue,
2276         .urb_dequeue =          dummy_urb_dequeue,
2277
2278         .get_frame_number =     dummy_h_get_frame,
2279
2280         .hub_status_data =      dummy_hub_status,
2281         .hub_control =          dummy_hub_control,
2282         .bus_suspend =          dummy_bus_suspend,
2283         .bus_resume =           dummy_bus_resume,
2284
2285         .alloc_streams =        dummy_alloc_streams,
2286         .free_streams =         dummy_free_streams,
2287 };
2288
2289 static int dummy_hcd_probe(struct platform_device *pdev)
2290 {
2291         struct usb_hcd          *hs_hcd;
2292         struct usb_hcd          *ss_hcd;
2293         int                     retval;
2294
2295         dev_info(&pdev->dev, "%s, driver " DRIVER_VERSION "\n", driver_desc);
2296
2297         if (!mod_data.is_super_speed)
2298                 dummy_hcd.flags = HCD_USB2;
2299         hs_hcd = usb_create_hcd(&dummy_hcd, &pdev->dev, dev_name(&pdev->dev));
2300         if (!hs_hcd)
2301                 return -ENOMEM;
2302         hs_hcd->has_tt = 1;
2303
2304         retval = usb_add_hcd(hs_hcd, 0, 0);
2305         if (retval != 0) {
2306                 usb_put_hcd(hs_hcd);
2307                 return retval;
2308         }
2309
2310         if (mod_data.is_super_speed) {
2311                 ss_hcd = usb_create_shared_hcd(&dummy_hcd, &pdev->dev,
2312                                         dev_name(&pdev->dev), hs_hcd);
2313                 if (!ss_hcd) {
2314                         retval = -ENOMEM;
2315                         goto dealloc_usb2_hcd;
2316                 }
2317
2318                 retval = usb_add_hcd(ss_hcd, 0, 0);
2319                 if (retval)
2320                         goto put_usb3_hcd;
2321         }
2322         return 0;
2323
2324 put_usb3_hcd:
2325         usb_put_hcd(ss_hcd);
2326 dealloc_usb2_hcd:
2327         usb_put_hcd(hs_hcd);
2328         the_controller.hs_hcd = the_controller.ss_hcd = NULL;
2329         return retval;
2330 }
2331
2332 static int dummy_hcd_remove(struct platform_device *pdev)
2333 {
2334         struct dummy            *dum;
2335
2336         dum = (hcd_to_dummy_hcd(platform_get_drvdata(pdev)))->dum;
2337
2338         if (dum->ss_hcd) {
2339                 usb_remove_hcd(dummy_hcd_to_hcd(dum->ss_hcd));
2340                 usb_put_hcd(dummy_hcd_to_hcd(dum->ss_hcd));
2341         }
2342
2343         usb_remove_hcd(dummy_hcd_to_hcd(dum->hs_hcd));
2344         usb_put_hcd(dummy_hcd_to_hcd(dum->hs_hcd));
2345
2346         the_controller.hs_hcd = NULL;
2347         the_controller.ss_hcd = NULL;
2348
2349         return 0;
2350 }
2351
2352 static int dummy_hcd_suspend (struct platform_device *pdev, pm_message_t state)
2353 {
2354         struct usb_hcd          *hcd;
2355         struct dummy_hcd        *dum_hcd;
2356         int                     rc = 0;
2357
2358         dev_dbg (&pdev->dev, "%s\n", __func__);
2359
2360         hcd = platform_get_drvdata (pdev);
2361         dum_hcd = hcd_to_dummy_hcd(hcd);
2362         if (dum_hcd->rh_state == DUMMY_RH_RUNNING) {
2363                 dev_warn(&pdev->dev, "Root hub isn't suspended!\n");
2364                 rc = -EBUSY;
2365         } else
2366                 clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
2367         return rc;
2368 }
2369
2370 static int dummy_hcd_resume (struct platform_device *pdev)
2371 {
2372         struct usb_hcd          *hcd;
2373
2374         dev_dbg (&pdev->dev, "%s\n", __func__);
2375
2376         hcd = platform_get_drvdata (pdev);
2377         set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
2378         usb_hcd_poll_rh_status (hcd);
2379         return 0;
2380 }
2381
2382 static struct platform_driver dummy_hcd_driver = {
2383         .probe          = dummy_hcd_probe,
2384         .remove         = dummy_hcd_remove,
2385         .suspend        = dummy_hcd_suspend,
2386         .resume         = dummy_hcd_resume,
2387         .driver         = {
2388                 .name   = (char *) driver_name,
2389                 .owner  = THIS_MODULE,
2390         },
2391 };
2392
2393 /*-------------------------------------------------------------------------*/
2394
2395 static struct platform_device *the_udc_pdev;
2396 static struct platform_device *the_hcd_pdev;
2397
2398 static int __init init (void)
2399 {
2400         int     retval = -ENOMEM;
2401
2402         if (usb_disabled ())
2403                 return -ENODEV;
2404
2405         if (!mod_data.is_high_speed && mod_data.is_super_speed)
2406                 return -EINVAL;
2407
2408         the_hcd_pdev = platform_device_alloc(driver_name, -1);
2409         if (!the_hcd_pdev)
2410                 return retval;
2411         the_udc_pdev = platform_device_alloc(gadget_name, -1);
2412         if (!the_udc_pdev)
2413                 goto err_alloc_udc;
2414
2415         retval = platform_driver_register(&dummy_hcd_driver);
2416         if (retval < 0)
2417                 goto err_register_hcd_driver;
2418         retval = platform_driver_register(&dummy_udc_driver);
2419         if (retval < 0)
2420                 goto err_register_udc_driver;
2421
2422         retval = platform_device_add(the_hcd_pdev);
2423         if (retval < 0)
2424                 goto err_add_hcd;
2425         if (!the_controller.hs_hcd ||
2426             (!the_controller.ss_hcd && mod_data.is_super_speed)) {
2427                 /*
2428                  * The hcd was added successfully but its probe function failed
2429                  * for some reason.
2430                  */
2431                 retval = -EINVAL;
2432                 goto err_add_udc;
2433         }
2434         retval = platform_device_add(the_udc_pdev);
2435         if (retval < 0)
2436                 goto err_add_udc;
2437         if (!platform_get_drvdata(the_udc_pdev)) {
2438                 /*
2439                  * The udc was added successfully but its probe function failed
2440                  * for some reason.
2441                  */
2442                 retval = -EINVAL;
2443                 goto err_probe_udc;
2444         }
2445         return retval;
2446
2447 err_probe_udc:
2448         platform_device_del(the_udc_pdev);
2449 err_add_udc:
2450         platform_device_del(the_hcd_pdev);
2451 err_add_hcd:
2452         platform_driver_unregister(&dummy_udc_driver);
2453 err_register_udc_driver:
2454         platform_driver_unregister(&dummy_hcd_driver);
2455 err_register_hcd_driver:
2456         platform_device_put(the_udc_pdev);
2457 err_alloc_udc:
2458         platform_device_put(the_hcd_pdev);
2459         return retval;
2460 }
2461 module_init (init);
2462
2463 static void __exit cleanup (void)
2464 {
2465         platform_device_unregister(the_udc_pdev);
2466         platform_device_unregister(the_hcd_pdev);
2467         platform_driver_unregister(&dummy_udc_driver);
2468         platform_driver_unregister(&dummy_hcd_driver);
2469 }
2470 module_exit (cleanup);