drivers/usb/gadget/udc/dummy_hcd.c

   1 /*
   2  * dummy_hcd.c -- Dummy/Loopback USB host and device emulator driver.
   3  *
   4  * Maintainer: Alan Stern <stern@rowland.harvard.edu>
   5  *
   6  * Copyright (C) 2003 David Brownell
   7  * Copyright (C) 2003-2005 Alan Stern
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  */
  14
  15
  16 /*
  17  * This exposes a device side "USB gadget" API, driven by requests to a
  18  * Linux-USB host controller driver.  USB traffic is simulated; there's
  19  * no need for USB hardware.  Use this with two other drivers:
  20  *
  21  *  - Gadget driver, responding to requests (slave);
  22  *  - Host-side device driver, as already familiar in Linux.
  23  *
  24  * Having this all in one kernel can help some stages of development,
  25  * bypassing some hardware (and driver) issues.  UML could help too.
  26  */
  27
  28 #include <linux/module.h>
  29 #include <linux/kernel.h>
  30 #include <linux/delay.h>
  31 #include <linux/ioport.h>
  32 #include <linux/slab.h>
  33 #include <linux/errno.h>
  34 #include <linux/init.h>
  35 #include <linux/timer.h>
  36 #include <linux/list.h>
  37 #include <linux/interrupt.h>
  38 #include <linux/platform_device.h>
  39 #include <linux/usb.h>
  40 #include <linux/usb/gadget.h>
  41 #include <linux/usb/hcd.h>
  42 #include <linux/scatterlist.h>
  43
  44 #include <asm/byteorder.h>
  45 #include <linux/io.h>
  46 #include <asm/irq.h>
  47 #include <asm/unaligned.h>
  48
  49 #define DRIVER_DESC     "USB Host+Gadget Emulator"
  50 #define DRIVER_VERSION  "02 May 2005"
  51
  52 #define POWER_BUDGET    500     /* in mA; use 8 for low-power port testing */
  53
  54 static const char       driver_name[] = "dummy_hcd";
  55 static const char       driver_desc[] = "USB Host+Gadget Emulator";
  56
  57 static const char       gadget_name[] = "dummy_udc";
  58
  59 MODULE_DESCRIPTION(DRIVER_DESC);
  60 MODULE_AUTHOR("David Brownell");
  61 MODULE_LICENSE("GPL");
  62
  63 struct dummy_hcd_module_parameters {
  64         bool is_super_speed;
  65         bool is_high_speed;
  66         unsigned int num;
  67 };
  68
  69 static struct dummy_hcd_module_parameters mod_data = {
  70         .is_super_speed = false,
  71         .is_high_speed = true,
  72         .num = 1,
  73 };
  74 module_param_named(is_super_speed, mod_data.is_super_speed, bool, S_IRUGO);
  75 MODULE_PARM_DESC(is_super_speed, "true to simulate SuperSpeed connection");
  76 module_param_named(is_high_speed, mod_data.is_high_speed, bool, S_IRUGO);
  77 MODULE_PARM_DESC(is_high_speed, "true to simulate HighSpeed connection");
  78 module_param_named(num, mod_data.num, uint, S_IRUGO);
  79 MODULE_PARM_DESC(num, "number of emulated controllers");
  80 /*-------------------------------------------------------------------------*/
  81
  82 /* gadget side driver data structres */
  83 struct dummy_ep {
  84         struct list_head                queue;
  85         unsigned long                   last_io;        /* jiffies timestamp */
  86         struct usb_gadget               *gadget;
  87         const struct usb_endpoint_descriptor *desc;
  88         struct usb_ep                   ep;
  89         unsigned                        halted:1;
  90         unsigned                        wedged:1;
  91         unsigned                        already_seen:1;
  92         unsigned                        setup_stage:1;
  93         unsigned                        stream_en:1;
  94 };
  95
  96 struct dummy_request {
  97         struct list_head                queue;          /* ep's requests */
  98         struct usb_request              req;
  99 };
 100
 101 static inline struct dummy_ep *usb_ep_to_dummy_ep(struct usb_ep *_ep)
 102 {
 103         return container_of(_ep, struct dummy_ep, ep);
 104 }
 105
 106 static inline struct dummy_request *usb_request_to_dummy_request
 107                 (struct usb_request *_req)
 108 {
 109         return container_of(_req, struct dummy_request, req);
 110 }
 111
 112 /*-------------------------------------------------------------------------*/
 113
 114 /*
 115  * Every device has ep0 for control requests, plus up to 30 more endpoints,
 116  * in one of two types:
 117  *
 118  *   - Configurable:  direction (in/out), type (bulk, iso, etc), and endpoint
 119  *     number can be changed.  Names like "ep-a" are used for this type.
 120  *
 121  *   - Fixed Function:  in other cases.  some characteristics may be mutable;
 122  *     that'd be hardware-specific.  Names like "ep12out-bulk" are used.
 123  *
 124  * Gadget drivers are responsible for not setting up conflicting endpoint
 125  * configurations, illegal or unsupported packet lengths, and so on.
 126  */
 127
 128 static const char ep0name[] = "ep0";
 129
 130 static const struct {
 131         const char *name;
 132         const struct usb_ep_caps caps;
 133 } ep_info[] = {
 134 #define EP_INFO(_name, _caps) \
 135         { \
 136                 .name = _name, \
 137                 .caps = _caps, \
 138         }
 139
 140         /* everyone has ep0 */
 141         EP_INFO(ep0name,
 142                 USB_EP_CAPS(USB_EP_CAPS_TYPE_CONTROL, USB_EP_CAPS_DIR_ALL)),
 143         /* act like a pxa250: fifteen fixed function endpoints */
 144         EP_INFO("ep1in-bulk",
 145                 USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, USB_EP_CAPS_DIR_IN)),
 146         EP_INFO("ep2out-bulk",
 147                 USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, USB_EP_CAPS_DIR_OUT)),
 148         EP_INFO("ep3in-iso",
 149                 USB_EP_CAPS(USB_EP_CAPS_TYPE_ISO, USB_EP_CAPS_DIR_IN)),
 150         EP_INFO("ep4out-iso",
 151                 USB_EP_CAPS(USB_EP_CAPS_TYPE_ISO, USB_EP_CAPS_DIR_OUT)),
 152         EP_INFO("ep5in-int",
 153                 USB_EP_CAPS(USB_EP_CAPS_TYPE_INT, USB_EP_CAPS_DIR_IN)),
 154         EP_INFO("ep6in-bulk",
 155                 USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, USB_EP_CAPS_DIR_IN)),
 156         EP_INFO("ep7out-bulk",
 157                 USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, USB_EP_CAPS_DIR_OUT)),
 158         EP_INFO("ep8in-iso",
 159                 USB_EP_CAPS(USB_EP_CAPS_TYPE_ISO, USB_EP_CAPS_DIR_IN)),
 160         EP_INFO("ep9out-iso",
 161                 USB_EP_CAPS(USB_EP_CAPS_TYPE_ISO, USB_EP_CAPS_DIR_OUT)),
 162         EP_INFO("ep10in-int",
 163                 USB_EP_CAPS(USB_EP_CAPS_TYPE_INT, USB_EP_CAPS_DIR_IN)),
 164         EP_INFO("ep11in-bulk",
 165                 USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, USB_EP_CAPS_DIR_IN)),
 166         EP_INFO("ep12out-bulk",
 167                 USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, USB_EP_CAPS_DIR_OUT)),
 168         EP_INFO("ep13in-iso",
 169                 USB_EP_CAPS(USB_EP_CAPS_TYPE_ISO, USB_EP_CAPS_DIR_IN)),
 170         EP_INFO("ep14out-iso",
 171                 USB_EP_CAPS(USB_EP_CAPS_TYPE_ISO, USB_EP_CAPS_DIR_OUT)),
 172         EP_INFO("ep15in-int",
 173                 USB_EP_CAPS(USB_EP_CAPS_TYPE_INT, USB_EP_CAPS_DIR_IN)),
 174         /* or like sa1100: two fixed function endpoints */
 175         EP_INFO("ep1out-bulk",
 176                 USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, USB_EP_CAPS_DIR_OUT)),
 177         EP_INFO("ep2in-bulk",
 178                 USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, USB_EP_CAPS_DIR_IN)),
 179         /* and now some generic EPs so we have enough in multi config */
 180         EP_INFO("ep3out",
 181                 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_OUT)),
 182         EP_INFO("ep4in",
 183                 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_IN)),
 184         EP_INFO("ep5out",
 185                 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_OUT)),
 186         EP_INFO("ep6out",
 187                 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_OUT)),
 188         EP_INFO("ep7in",
 189                 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_IN)),
 190         EP_INFO("ep8out",
 191                 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_OUT)),
 192         EP_INFO("ep9in",
 193                 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_IN)),
 194         EP_INFO("ep10out",
 195                 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_OUT)),
 196         EP_INFO("ep11out",
 197                 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_OUT)),
 198         EP_INFO("ep12in",
 199                 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_IN)),
 200         EP_INFO("ep13out",
 201                 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_OUT)),
 202         EP_INFO("ep14in",
 203                 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_IN)),
 204         EP_INFO("ep15out",
 205                 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_OUT)),
 206
 207 #undef EP_INFO
 208 };
 209
 210 #define DUMMY_ENDPOINTS ARRAY_SIZE(ep_info)
 211
 212 /*-------------------------------------------------------------------------*/
 213
 214 #define FIFO_SIZE               64
 215
 216 struct urbp {
 217         struct urb              *urb;
 218         struct list_head        urbp_list;
 219         struct sg_mapping_iter  miter;
 220         u32                     miter_started;
 221 };
 222
 223
 224 enum dummy_rh_state {
 225         DUMMY_RH_RESET,
 226         DUMMY_RH_SUSPENDED,
 227         DUMMY_RH_RUNNING
 228 };
 229
 230 struct dummy_hcd {
 231         struct dummy                    *dum;
 232         enum dummy_rh_state             rh_state;
 233         struct timer_list               timer;
 234         u32                             port_status;
 235         u32                             old_status;
 236         unsigned long                   re_timeout;
 237
 238         struct usb_device               *udev;
 239         struct list_head                urbp_list;
 240         u32                             stream_en_ep;
 241         u8                              num_stream[30 / 2];
 242
 243         unsigned                        active:1;
 244         unsigned                        old_active:1;
 245         unsigned                        resuming:1;
 246 };
 247
 248 struct dummy {
 249         spinlock_t                      lock;
 250
 251         /*
 252          * SLAVE/GADGET side support
 253          */
 254         struct dummy_ep                 ep[DUMMY_ENDPOINTS];
 255         int                             address;
 256         struct usb_gadget               gadget;
 257         struct usb_gadget_driver        *driver;
 258         struct dummy_request            fifo_req;
 259         u8                              fifo_buf[FIFO_SIZE];
 260         u16                             devstatus;
 261         unsigned                        udc_suspended:1;
 262         unsigned                        pullup:1;
 263
 264         /*
 265          * MASTER/HOST side support
 266          */
 267         struct dummy_hcd                *hs_hcd;
 268         struct dummy_hcd                *ss_hcd;
 269 };
 270
 271 static inline struct dummy_hcd *hcd_to_dummy_hcd(struct usb_hcd *hcd)
 272 {
 273         return (struct dummy_hcd *) (hcd->hcd_priv);
 274 }
 275
 276 static inline struct usb_hcd *dummy_hcd_to_hcd(struct dummy_hcd *dum)
 277 {
 278         return container_of((void *) dum, struct usb_hcd, hcd_priv);
 279 }
 280
 281 static inline struct device *dummy_dev(struct dummy_hcd *dum)
 282 {
 283         return dummy_hcd_to_hcd(dum)->self.controller;
 284 }
 285
 286 static inline struct device *udc_dev(struct dummy *dum)
 287 {
 288         return dum->gadget.dev.parent;
 289 }
 290
 291 static inline struct dummy *ep_to_dummy(struct dummy_ep *ep)
 292 {
 293         return container_of(ep->gadget, struct dummy, gadget);
 294 }
 295
 296 static inline struct dummy_hcd *gadget_to_dummy_hcd(struct usb_gadget *gadget)
 297 {
 298         struct dummy *dum = container_of(gadget, struct dummy, gadget);
 299         if (dum->gadget.speed == USB_SPEED_SUPER)
 300                 return dum->ss_hcd;
 301         else
 302                 return dum->hs_hcd;
 303 }
 304
 305 static inline struct dummy *gadget_dev_to_dummy(struct device *dev)
 306 {
 307         return container_of(dev, struct dummy, gadget.dev);
 308 }
 309
 310 /*-------------------------------------------------------------------------*/
 311
 312 /* SLAVE/GADGET SIDE UTILITY ROUTINES */
 313
 314 /* called with spinlock held */
 315 static void nuke(struct dummy *dum, struct dummy_ep *ep)
 316 {
 317         while (!list_empty(&ep->queue)) {
 318                 struct dummy_request    *req;
 319
 320                 req = list_entry(ep->queue.next, struct dummy_request, queue);
 321                 list_del_init(&req->queue);
 322                 req->req.status = -ESHUTDOWN;
 323
 324                 spin_unlock(&dum->lock);
 325                 usb_gadget_giveback_request(&ep->ep, &req->req);
 326                 spin_lock(&dum->lock);
 327         }
 328 }
 329
 330 /* caller must hold lock */
 331 static void stop_activity(struct dummy *dum)
 332 {
 333         int i;
 334
 335         /* prevent any more requests */
 336         dum->address = 0;
 337
 338         /* The timer is left running so that outstanding URBs can fail */
 339
 340         /* nuke any pending requests first, so driver i/o is quiesced */
 341         for (i = 0; i < DUMMY_ENDPOINTS; ++i)
 342                 nuke(dum, &dum->ep[i]);
 343
 344         /* driver now does any non-usb quiescing necessary */
 345 }
 346
 347 /**
 348  * set_link_state_by_speed() - Sets the current state of the link according to
 349  *      the hcd speed
 350  * @dum_hcd: pointer to the dummy_hcd structure to update the link state for
 351  *
 352  * This function updates the port_status according to the link state and the
 353  * speed of the hcd.
 354  */
 355 static void set_link_state_by_speed(struct dummy_hcd *dum_hcd)
 356 {
 357         struct dummy *dum = dum_hcd->dum;
 358
 359         if (dummy_hcd_to_hcd(dum_hcd)->speed == HCD_USB3) {
 360                 if ((dum_hcd->port_status & USB_SS_PORT_STAT_POWER) == 0) {
 361                         dum_hcd->port_status = 0;
 362                 } else if (!dum->pullup || dum->udc_suspended) {
 363                         /* UDC suspend must cause a disconnect */
 364                         dum_hcd->port_status &= ~(USB_PORT_STAT_CONNECTION |
 365                                                 USB_PORT_STAT_ENABLE);
 366                         if ((dum_hcd->old_status &
 367                              USB_PORT_STAT_CONNECTION) != 0)
 368                                 dum_hcd->port_status |=
 369                                         (USB_PORT_STAT_C_CONNECTION << 16);
 370                 } else {
 371                         /* device is connected and not suspended */
 372                         dum_hcd->port_status |= (USB_PORT_STAT_CONNECTION |
 373                                                  USB_PORT_STAT_SPEED_5GBPS) ;
 374                         if ((dum_hcd->old_status &
 375                              USB_PORT_STAT_CONNECTION) == 0)
 376                                 dum_hcd->port_status |=
 377                                         (USB_PORT_STAT_C_CONNECTION << 16);
 378                         if ((dum_hcd->port_status &
 379                              USB_PORT_STAT_ENABLE) == 1 &&
 380                                 (dum_hcd->port_status &
 381                                  USB_SS_PORT_LS_U0) == 1 &&
 382                                 dum_hcd->rh_state != DUMMY_RH_SUSPENDED)
 383                                 dum_hcd->active = 1;
 384                 }
 385         } else {
 386                 if ((dum_hcd->port_status & USB_PORT_STAT_POWER) == 0) {
 387                         dum_hcd->port_status = 0;
 388                 } else if (!dum->pullup || dum->udc_suspended) {
 389                         /* UDC suspend must cause a disconnect */
 390                         dum_hcd->port_status &= ~(USB_PORT_STAT_CONNECTION |
 391                                                 USB_PORT_STAT_ENABLE |
 392                                                 USB_PORT_STAT_LOW_SPEED |
 393                                                 USB_PORT_STAT_HIGH_SPEED |
 394                                                 USB_PORT_STAT_SUSPEND);
 395                         if ((dum_hcd->old_status &
 396                              USB_PORT_STAT_CONNECTION) != 0)
 397                                 dum_hcd->port_status |=
 398                                         (USB_PORT_STAT_C_CONNECTION << 16);
 399                 } else {
 400                         dum_hcd->port_status |= USB_PORT_STAT_CONNECTION;
 401                         if ((dum_hcd->old_status &
 402                              USB_PORT_STAT_CONNECTION) == 0)
 403                                 dum_hcd->port_status |=
 404                                         (USB_PORT_STAT_C_CONNECTION << 16);
 405                         if ((dum_hcd->port_status & USB_PORT_STAT_ENABLE) == 0)
 406                                 dum_hcd->port_status &= ~USB_PORT_STAT_SUSPEND;
 407                         else if ((dum_hcd->port_status &
 408                                   USB_PORT_STAT_SUSPEND) == 0 &&
 409                                         dum_hcd->rh_state != DUMMY_RH_SUSPENDED)
 410                                 dum_hcd->active = 1;
 411                 }
 412         }
 413 }
 414
 415 /* caller must hold lock */
 416 static void set_link_state(struct dummy_hcd *dum_hcd)
 417 {
 418         struct dummy *dum = dum_hcd->dum;
 419
 420         dum_hcd->active = 0;
 421         if (dum->pullup)
 422                 if ((dummy_hcd_to_hcd(dum_hcd)->speed == HCD_USB3 &&
 423                      dum->gadget.speed != USB_SPEED_SUPER) ||
 424                     (dummy_hcd_to_hcd(dum_hcd)->speed != HCD_USB3 &&
 425                      dum->gadget.speed == USB_SPEED_SUPER))
 426                         return;
 427
 428         set_link_state_by_speed(dum_hcd);
 429
 430         if ((dum_hcd->port_status & USB_PORT_STAT_ENABLE) == 0 ||
 431              dum_hcd->active)
 432                 dum_hcd->resuming = 0;
 433
 434         /* Currently !connected or in reset */
 435         if ((dum_hcd->port_status & USB_PORT_STAT_CONNECTION) == 0 ||
 436                         (dum_hcd->port_status & USB_PORT_STAT_RESET) != 0) {
 437                 unsigned disconnect = USB_PORT_STAT_CONNECTION &
 438                                 dum_hcd->old_status & (~dum_hcd->port_status);
 439                 unsigned reset = USB_PORT_STAT_RESET &
 440                                 (~dum_hcd->old_status) & dum_hcd->port_status;
 441
 442                 /* Report reset and disconnect events to the driver */
 443                 if (dum->driver && (disconnect || reset)) {
 444                         stop_activity(dum);
 445                         spin_unlock(&dum->lock);
 446                         if (reset)
 447                                 usb_gadget_udc_reset(&dum->gadget, dum->driver);
 448                         else
 449                                 dum->driver->disconnect(&dum->gadget);
 450                         spin_lock(&dum->lock);
 451                 }
 452         } else if (dum_hcd->active != dum_hcd->old_active) {
 453                 if (dum_hcd->old_active && dum->driver->suspend) {
 454                         spin_unlock(&dum->lock);
 455                         dum->driver->suspend(&dum->gadget);
 456                         spin_lock(&dum->lock);
 457                 } else if (!dum_hcd->old_active &&  dum->driver->resume) {
 458                         spin_unlock(&dum->lock);
 459                         dum->driver->resume(&dum->gadget);
 460                         spin_lock(&dum->lock);
 461                 }
 462         }
 463
 464         dum_hcd->old_status = dum_hcd->port_status;
 465         dum_hcd->old_active = dum_hcd->active;
 466 }
 467
 468 /*-------------------------------------------------------------------------*/
 469
 470 /* SLAVE/GADGET SIDE DRIVER
 471  *
 472  * This only tracks gadget state.  All the work is done when the host
 473  * side tries some (emulated) i/o operation.  Real device controller
 474  * drivers would do real i/o using dma, fifos, irqs, timers, etc.
 475  */
 476
 477 #define is_enabled(dum) \
 478         (dum->port_status & USB_PORT_STAT_ENABLE)
 479
 480 static int dummy_enable(struct usb_ep *_ep,
 481                 const struct usb_endpoint_descriptor *desc)
 482 {
 483         struct dummy            *dum;
 484         struct dummy_hcd        *dum_hcd;
 485         struct dummy_ep         *ep;
 486         unsigned                max;
 487         int                     retval;
 488
 489         ep = usb_ep_to_dummy_ep(_ep);
 490         if (!_ep || !desc || ep->desc || _ep->name == ep0name
 491                         || desc->bDescriptorType != USB_DT_ENDPOINT)
 492                 return -EINVAL;
 493         dum = ep_to_dummy(ep);
 494         if (!dum->driver)
 495                 return -ESHUTDOWN;
 496
 497         dum_hcd = gadget_to_dummy_hcd(&dum->gadget);
 498         if (!is_enabled(dum_hcd))
 499                 return -ESHUTDOWN;
 500
 501         /*
 502          * For HS/FS devices only bits 0..10 of the wMaxPacketSize represent the
 503          * maximum packet size.
 504          * For SS devices the wMaxPacketSize is limited by 1024.
 505          */
 506         max = usb_endpoint_maxp(desc);
 507
 508         /* drivers must not request bad settings, since lower levels
 509          * (hardware or its drivers) may not check.  some endpoints
 510          * can't do iso, many have maxpacket limitations, etc.
 511          *
 512          * since this "hardware" driver is here to help debugging, we
 513          * have some extra sanity checks.  (there could be more though,
 514          * especially for "ep9out" style fixed function ones.)
 515          */
 516         retval = -EINVAL;
 517         switch (usb_endpoint_type(desc)) {
 518         case USB_ENDPOINT_XFER_BULK:
 519                 if (strstr(ep->ep.name, "-iso")
 520                                 || strstr(ep->ep.name, "-int")) {
 521                         goto done;
 522                 }
 523                 switch (dum->gadget.speed) {
 524                 case USB_SPEED_SUPER:
 525                         if (max == 1024)
 526                                 break;
 527                         goto done;
 528                 case USB_SPEED_HIGH:
 529                         if (max == 512)
 530                                 break;
 531                         goto done;
 532                 case USB_SPEED_FULL:
 533                         if (max == 8 || max == 16 || max == 32 || max == 64)
 534                                 /* we'll fake any legal size */
 535                                 break;
 536                         /* save a return statement */
 537                 default:
 538                         goto done;
 539                 }
 540                 break;
 541         case USB_ENDPOINT_XFER_INT:
 542                 if (strstr(ep->ep.name, "-iso")) /* bulk is ok */
 543                         goto done;
 544                 /* real hardware might not handle all packet sizes */
 545                 switch (dum->gadget.speed) {
 546                 case USB_SPEED_SUPER:
 547                 case USB_SPEED_HIGH:
 548                         if (max <= 1024)
 549                                 break;
 550                         /* save a return statement */
 551                 case USB_SPEED_FULL:
 552                         if (max <= 64)
 553                                 break;
 554                         /* save a return statement */
 555                 default:
 556                         if (max <= 8)
 557                                 break;
 558                         goto done;
 559                 }
 560                 break;
 561         case USB_ENDPOINT_XFER_ISOC:
 562                 if (strstr(ep->ep.name, "-bulk")
 563                                 || strstr(ep->ep.name, "-int"))
 564                         goto done;
 565                 /* real hardware might not handle all packet sizes */
 566                 switch (dum->gadget.speed) {
 567                 case USB_SPEED_SUPER:
 568                 case USB_SPEED_HIGH:
 569                         if (max <= 1024)
 570                                 break;
 571                         /* save a return statement */
 572                 case USB_SPEED_FULL:
 573                         if (max <= 1023)
 574                                 break;
 575                         /* save a return statement */
 576                 default:
 577                         goto done;
 578                 }
 579                 break;
 580         default:
 581                 /* few chips support control except on ep0 */
 582                 goto done;
 583         }
 584
 585         _ep->maxpacket = max;
 586         if (usb_ss_max_streams(_ep->comp_desc)) {
 587                 if (!usb_endpoint_xfer_bulk(desc)) {
 588                         dev_err(udc_dev(dum), "Can't enable stream support on "
 589                                         "non-bulk ep %s\n", _ep->name);
 590                         return -EINVAL;
 591                 }
 592                 ep->stream_en = 1;
 593         }
 594         ep->desc = desc;
 595
 596         dev_dbg(udc_dev(dum), "enabled %s (ep%d%s-%s) maxpacket %d stream %s\n",
 597                 _ep->name,
 598                 desc->bEndpointAddress & 0x0f,
 599                 (desc->bEndpointAddress & USB_DIR_IN) ? "in" : "out",
 600                 ({ char *val;
 601                  switch (usb_endpoint_type(desc)) {
 602                  case USB_ENDPOINT_XFER_BULK:
 603                          val = "bulk";
 604                          break;
 605                  case USB_ENDPOINT_XFER_ISOC:
 606                          val = "iso";
 607                          break;
 608                  case USB_ENDPOINT_XFER_INT:
 609                          val = "intr";
 610                          break;
 611                  default:
 612                          val = "ctrl";
 613                          break;
 614                  } val; }),
 615                 max, ep->stream_en ? "enabled" : "disabled");
 616
 617         /* at this point real hardware should be NAKing transfers
 618          * to that endpoint, until a buffer is queued to it.
 619          */
 620         ep->halted = ep->wedged = 0;
 621         retval = 0;
 622 done:
 623         return retval;
 624 }
 625
 626 static int dummy_disable(struct usb_ep *_ep)
 627 {
 628         struct dummy_ep         *ep;
 629         struct dummy            *dum;
 630         unsigned long           flags;
 631
 632         ep = usb_ep_to_dummy_ep(_ep);
 633         if (!_ep || !ep->desc || _ep->name == ep0name)
 634                 return -EINVAL;
 635         dum = ep_to_dummy(ep);
 636
 637         spin_lock_irqsave(&dum->lock, flags);
 638         ep->desc = NULL;
 639         ep->stream_en = 0;
 640         nuke(dum, ep);
 641         spin_unlock_irqrestore(&dum->lock, flags);
 642
 643         dev_dbg(udc_dev(dum), "disabled %s\n", _ep->name);
 644         return 0;
 645 }
 646
 647 static struct usb_request *dummy_alloc_request(struct usb_ep *_ep,
 648                 gfp_t mem_flags)
 649 {
 650         struct dummy_request    *req;
 651
 652         if (!_ep)
 653                 return NULL;
 654
 655         req = kzalloc(sizeof(*req), mem_flags);
 656         if (!req)
 657                 return NULL;
 658         INIT_LIST_HEAD(&req->queue);
 659         return &req->req;
 660 }
 661
 662 static void dummy_free_request(struct usb_ep *_ep, struct usb_request *_req)
 663 {
 664         struct dummy_request    *req;
 665
 666         if (!_ep || !_req) {
 667                 WARN_ON(1);
 668                 return;
 669         }
 670
 671         req = usb_request_to_dummy_request(_req);
 672         WARN_ON(!list_empty(&req->queue));
 673         kfree(req);
 674 }
 675
 676 static void fifo_complete(struct usb_ep *ep, struct usb_request *req)
 677 {
 678 }
 679
 680 static int dummy_queue(struct usb_ep *_ep, struct usb_request *_req,
 681                 gfp_t mem_flags)
 682 {
 683         struct dummy_ep         *ep;
 684         struct dummy_request    *req;
 685         struct dummy            *dum;
 686         struct dummy_hcd        *dum_hcd;
 687         unsigned long           flags;
 688
 689         req = usb_request_to_dummy_request(_req);
 690         if (!_req || !list_empty(&req->queue) || !_req->complete)
 691                 return -EINVAL;
 692
 693         ep = usb_ep_to_dummy_ep(_ep);
 694         if (!_ep || (!ep->desc && _ep->name != ep0name))
 695                 return -EINVAL;
 696
 697         dum = ep_to_dummy(ep);
 698         dum_hcd = gadget_to_dummy_hcd(&dum->gadget);
 699         if (!dum->driver || !is_enabled(dum_hcd))
 700                 return -ESHUTDOWN;
 701
 702 #if 0
 703         dev_dbg(udc_dev(dum), "ep %p queue req %p to %s, len %d buf %p\n",
 704                         ep, _req, _ep->name, _req->length, _req->buf);
 705 #endif
 706         _req->status = -EINPROGRESS;
 707         _req->actual = 0;
 708         spin_lock_irqsave(&dum->lock, flags);
 709
 710         /* implement an emulated single-request FIFO */
 711         if (ep->desc && (ep->desc->bEndpointAddress & USB_DIR_IN) &&
 712                         list_empty(&dum->fifo_req.queue) &&
 713                         list_empty(&ep->queue) &&
 714                         _req->length <= FIFO_SIZE) {
 715                 req = &dum->fifo_req;
 716                 req->req = *_req;
 717                 req->req.buf = dum->fifo_buf;
 718                 memcpy(dum->fifo_buf, _req->buf, _req->length);
 719                 req->req.context = dum;
 720                 req->req.complete = fifo_complete;
 721
 722                 list_add_tail(&req->queue, &ep->queue);
 723                 spin_unlock(&dum->lock);
 724                 _req->actual = _req->length;
 725                 _req->status = 0;
 726                 usb_gadget_giveback_request(_ep, _req);
 727                 spin_lock(&dum->lock);
 728         }  else
 729                 list_add_tail(&req->queue, &ep->queue);
 730         spin_unlock_irqrestore(&dum->lock, flags);
 731
 732         /* real hardware would likely enable transfers here, in case
 733          * it'd been left NAKing.
 734          */
 735         return 0;
 736 }
 737
 738 static int dummy_dequeue(struct usb_ep *_ep, struct usb_request *_req)
 739 {
 740         struct dummy_ep         *ep;
 741         struct dummy            *dum;
 742         int                     retval = -EINVAL;
 743         unsigned long           flags;
 744         struct dummy_request    *req = NULL;
 745
 746         if (!_ep || !_req)
 747                 return retval;
 748         ep = usb_ep_to_dummy_ep(_ep);
 749         dum = ep_to_dummy(ep);
 750
 751         if (!dum->driver)
 752                 return -ESHUTDOWN;
 753
 754         local_irq_save(flags);
 755         spin_lock(&dum->lock);
 756         list_for_each_entry(req, &ep->queue, queue) {
 757                 if (&req->req == _req) {
 758                         list_del_init(&req->queue);
 759                         _req->status = -ECONNRESET;
 760                         retval = 0;
 761                         break;
 762                 }
 763         }
 764         spin_unlock(&dum->lock);
 765
 766         if (retval == 0) {
 767                 dev_dbg(udc_dev(dum),
 768                                 "dequeued req %p from %s, len %d buf %p\n",
 769                                 req, _ep->name, _req->length, _req->buf);
 770                 usb_gadget_giveback_request(_ep, _req);
 771         }
 772         local_irq_restore(flags);
 773         return retval;
 774 }
 775
 776 static int
 777 dummy_set_halt_and_wedge(struct usb_ep *_ep, int value, int wedged)
 778 {
 779         struct dummy_ep         *ep;
 780         struct dummy            *dum;
 781
 782         if (!_ep)
 783                 return -EINVAL;
 784         ep = usb_ep_to_dummy_ep(_ep);
 785         dum = ep_to_dummy(ep);
 786         if (!dum->driver)
 787                 return -ESHUTDOWN;
 788         if (!value)
 789                 ep->halted = ep->wedged = 0;
 790         else if (ep->desc && (ep->desc->bEndpointAddress & USB_DIR_IN) &&
 791                         !list_empty(&ep->queue))
 792                 return -EAGAIN;
 793         else {
 794                 ep->halted = 1;
 795                 if (wedged)
 796                         ep->wedged = 1;
 797         }
 798         /* FIXME clear emulated data toggle too */
 799         return 0;
 800 }
 801
 802 static int
 803 dummy_set_halt(struct usb_ep *_ep, int value)
 804 {
 805         return dummy_set_halt_and_wedge(_ep, value, 0);
 806 }
 807
 808 static int dummy_set_wedge(struct usb_ep *_ep)
 809 {
 810         if (!_ep || _ep->name == ep0name)
 811                 return -EINVAL;
 812         return dummy_set_halt_and_wedge(_ep, 1, 1);
 813 }
 814
 815 static const struct usb_ep_ops dummy_ep_ops = {
 816         .enable         = dummy_enable,
 817         .disable        = dummy_disable,
 818
 819         .alloc_request  = dummy_alloc_request,
 820         .free_request   = dummy_free_request,
 821
 822         .queue          = dummy_queue,
 823         .dequeue        = dummy_dequeue,
 824
 825         .set_halt       = dummy_set_halt,
 826         .set_wedge      = dummy_set_wedge,
 827 };
 828
 829 /*-------------------------------------------------------------------------*/
 830
 831 /* there are both host and device side versions of this call ... */
 832 static int dummy_g_get_frame(struct usb_gadget *_gadget)
 833 {
 834         struct timespec64 ts64;
 835
 836         ktime_get_ts64(&ts64);
 837         return ts64.tv_nsec / NSEC_PER_MSEC;
 838 }
 839
 840 static int dummy_wakeup(struct usb_gadget *_gadget)
 841 {
 842         struct dummy_hcd *dum_hcd;
 843
 844         dum_hcd = gadget_to_dummy_hcd(_gadget);
 845         if (!(dum_hcd->dum->devstatus & ((1 << USB_DEVICE_B_HNP_ENABLE)
 846                                 | (1 << USB_DEVICE_REMOTE_WAKEUP))))
 847                 return -EINVAL;
 848         if ((dum_hcd->port_status & USB_PORT_STAT_CONNECTION) == 0)
 849                 return -ENOLINK;
 850         if ((dum_hcd->port_status & USB_PORT_STAT_SUSPEND) == 0 &&
 851                          dum_hcd->rh_state != DUMMY_RH_SUSPENDED)
 852                 return -EIO;
 853
 854         /* FIXME: What if the root hub is suspended but the port isn't? */
 855
 856         /* hub notices our request, issues downstream resume, etc */
 857         dum_hcd->resuming = 1;
 858         dum_hcd->re_timeout = jiffies + msecs_to_jiffies(20);
 859         mod_timer(&dummy_hcd_to_hcd(dum_hcd)->rh_timer, dum_hcd->re_timeout);
 860         return 0;
 861 }
 862
 863 static int dummy_set_selfpowered(struct usb_gadget *_gadget, int value)
 864 {
 865         struct dummy    *dum;
 866
 867         _gadget->is_selfpowered = (value != 0);
 868         dum = gadget_to_dummy_hcd(_gadget)->dum;
 869         if (value)
 870                 dum->devstatus |= (1 << USB_DEVICE_SELF_POWERED);
 871         else
 872                 dum->devstatus &= ~(1 << USB_DEVICE_SELF_POWERED);
 873         return 0;
 874 }
 875
 876 static void dummy_udc_update_ep0(struct dummy *dum)
 877 {
 878         if (dum->gadget.speed == USB_SPEED_SUPER)
 879                 dum->ep[0].ep.maxpacket = 9;
 880         else
 881                 dum->ep[0].ep.maxpacket = 64;
 882 }
 883
 884 static int dummy_pullup(struct usb_gadget *_gadget, int value)
 885 {
 886         struct dummy_hcd *dum_hcd;
 887         struct dummy    *dum;
 888         unsigned long   flags;
 889
 890         dum = gadget_dev_to_dummy(&_gadget->dev);
 891
 892         if (value && dum->driver) {
 893                 if (mod_data.is_super_speed)
 894                         dum->gadget.speed = dum->driver->max_speed;
 895                 else if (mod_data.is_high_speed)
 896                         dum->gadget.speed = min_t(u8, USB_SPEED_HIGH,
 897                                         dum->driver->max_speed);
 898                 else
 899                         dum->gadget.speed = USB_SPEED_FULL;
 900                 dummy_udc_update_ep0(dum);
 901
 902                 if (dum->gadget.speed < dum->driver->max_speed)
 903                         dev_dbg(udc_dev(dum), "This device can perform faster"
 904                                 " if you connect it to a %s port...\n",
 905                                 usb_speed_string(dum->driver->max_speed));
 906         }
 907         dum_hcd = gadget_to_dummy_hcd(_gadget);
 908
 909         spin_lock_irqsave(&dum->lock, flags);
 910         dum->pullup = (value != 0);
 911         set_link_state(dum_hcd);
 912         spin_unlock_irqrestore(&dum->lock, flags);
 913
 914         usb_hcd_poll_rh_status(dummy_hcd_to_hcd(dum_hcd));
 915         return 0;
 916 }
 917
 918 static int dummy_udc_start(struct usb_gadget *g,
 919                 struct usb_gadget_driver *driver);
 920 static int dummy_udc_stop(struct usb_gadget *g);
 921
 922 static const struct usb_gadget_ops dummy_ops = {
 923         .get_frame      = dummy_g_get_frame,
 924         .wakeup         = dummy_wakeup,
 925         .set_selfpowered = dummy_set_selfpowered,
 926         .pullup         = dummy_pullup,
 927         .udc_start      = dummy_udc_start,
 928         .udc_stop       = dummy_udc_stop,
 929 };
 930
 931 /*-------------------------------------------------------------------------*/
 932
 933 /* "function" sysfs attribute */
 934 static ssize_t function_show(struct device *dev, struct device_attribute *attr,
 935                 char *buf)
 936 {
 937         struct dummy    *dum = gadget_dev_to_dummy(dev);
 938
 939         if (!dum->driver || !dum->driver->function)
 940                 return 0;
 941         return scnprintf(buf, PAGE_SIZE, "%s\n", dum->driver->function);
 942 }
 943 static DEVICE_ATTR_RO(function);
 944
 945 /*-------------------------------------------------------------------------*/
 946
 947 /*
 948  * Driver registration/unregistration.
 949  *
 950  * This is basically hardware-specific; there's usually only one real USB
 951  * device (not host) controller since that's how USB devices are intended
 952  * to work.  So most implementations of these api calls will rely on the
 953  * fact that only one driver will ever bind to the hardware.  But curious
 954  * hardware can be built with discrete components, so the gadget API doesn't
 955  * require that assumption.
 956  *
 957  * For this emulator, it might be convenient to create a usb slave device
 958  * for each driver that registers:  just add to a big root hub.
 959  */
 960
 961 static int dummy_udc_start(struct usb_gadget *g,
 962                 struct usb_gadget_driver *driver)
 963 {
 964         struct dummy_hcd        *dum_hcd = gadget_to_dummy_hcd(g);
 965         struct dummy            *dum = dum_hcd->dum;
 966
 967         if (driver->max_speed == USB_SPEED_UNKNOWN)
 968                 return -EINVAL;
 969
 970         /*
 971          * SLAVE side init ... the layer above hardware, which
 972          * can't enumerate without help from the driver we're binding.
 973          */
 974
 975         dum->devstatus = 0;
 976         dum->driver = driver;
 977
 978         return 0;
 979 }
 980
 981 static int dummy_udc_stop(struct usb_gadget *g)
 982 {
 983         struct dummy_hcd        *dum_hcd = gadget_to_dummy_hcd(g);
 984         struct dummy            *dum = dum_hcd->dum;
 985
 986         dum->driver = NULL;
 987
 988         return 0;
 989 }
 990
 991 #undef is_enabled
 992
 993 /* The gadget structure is stored inside the hcd structure and will be
 994  * released along with it. */
 995 static void init_dummy_udc_hw(struct dummy *dum)
 996 {
 997         int i;
 998
 999         INIT_LIST_HEAD(&dum->gadget.ep_list);
1000         for (i = 0; i < DUMMY_ENDPOINTS; i++) {
1001                 struct dummy_ep *ep = &dum->ep[i];
1002
1003                 if (!ep_info[i].name)
1004                         break;
1005                 ep->ep.name = ep_info[i].name;
1006                 ep->ep.caps = ep_info[i].caps;
1007                 ep->ep.ops = &dummy_ep_ops;
1008                 list_add_tail(&ep->ep.ep_list, &dum->gadget.ep_list);
1009                 ep->halted = ep->wedged = ep->already_seen =
1010                                 ep->setup_stage = 0;
1011                 usb_ep_set_maxpacket_limit(&ep->ep, ~0);
1012                 ep->ep.max_streams = 16;
1013                 ep->last_io = jiffies;
1014                 ep->gadget = &dum->gadget;
1015                 ep->desc = NULL;
1016                 INIT_LIST_HEAD(&ep->queue);
1017         }
1018
1019         dum->gadget.ep0 = &dum->ep[0].ep;
1020         list_del_init(&dum->ep[0].ep.ep_list);
1021         INIT_LIST_HEAD(&dum->fifo_req.queue);
1022
1023 #ifdef CONFIG_USB_OTG
1024         dum->gadget.is_otg = 1;
1025 #endif
1026 }
1027
1028 static int dummy_udc_probe(struct platform_device *pdev)
1029 {
1030         struct dummy    *dum;
1031         int             rc;
1032
1033         dum = *((void **)dev_get_platdata(&pdev->dev));
1034         dum->gadget.name = gadget_name;
1035         dum->gadget.ops = &dummy_ops;
1036         dum->gadget.max_speed = USB_SPEED_SUPER;
1037
1038         dum->gadget.dev.parent = &pdev->dev;
1039         init_dummy_udc_hw(dum);
1040
1041         rc = usb_add_gadget_udc(&pdev->dev, &dum->gadget);
1042         if (rc < 0)
1043                 goto err_udc;
1044
1045         rc = device_create_file(&dum->gadget.dev, &dev_attr_function);
1046         if (rc < 0)
1047                 goto err_dev;
1048         platform_set_drvdata(pdev, dum);
1049         return rc;
1050
1051 err_dev:
1052         usb_del_gadget_udc(&dum->gadget);
1053 err_udc:
1054         return rc;
1055 }
1056
1057 static int dummy_udc_remove(struct platform_device *pdev)
1058 {
1059         struct dummy    *dum = platform_get_drvdata(pdev);
1060
1061         device_remove_file(&dum->gadget.dev, &dev_attr_function);
1062         usb_del_gadget_udc(&dum->gadget);
1063         return 0;
1064 }
1065
1066 static void dummy_udc_pm(struct dummy *dum, struct dummy_hcd *dum_hcd,
1067                 int suspend)
1068 {
1069         spin_lock_irq(&dum->lock);
1070         dum->udc_suspended = suspend;
1071         set_link_state(dum_hcd);
1072         spin_unlock_irq(&dum->lock);
1073 }
1074
1075 static int dummy_udc_suspend(struct platform_device *pdev, pm_message_t state)
1076 {
1077         struct dummy            *dum = platform_get_drvdata(pdev);
1078         struct dummy_hcd        *dum_hcd = gadget_to_dummy_hcd(&dum->gadget);
1079
1080         dev_dbg(&pdev->dev, "%s\n", __func__);
1081         dummy_udc_pm(dum, dum_hcd, 1);
1082         usb_hcd_poll_rh_status(dummy_hcd_to_hcd(dum_hcd));
1083         return 0;
1084 }
1085
1086 static int dummy_udc_resume(struct platform_device *pdev)
1087 {
1088         struct dummy            *dum = platform_get_drvdata(pdev);
1089         struct dummy_hcd        *dum_hcd = gadget_to_dummy_hcd(&dum->gadget);
1090
1091         dev_dbg(&pdev->dev, "%s\n", __func__);
1092         dummy_udc_pm(dum, dum_hcd, 0);
1093         usb_hcd_poll_rh_status(dummy_hcd_to_hcd(dum_hcd));
1094         return 0;
1095 }
1096
1097 static struct platform_driver dummy_udc_driver = {
1098         .probe          = dummy_udc_probe,
1099         .remove         = dummy_udc_remove,
1100         .suspend        = dummy_udc_suspend,
1101         .resume         = dummy_udc_resume,
1102         .driver         = {
1103                 .name   = (char *) gadget_name,
1104         },
1105 };
1106
1107 /*-------------------------------------------------------------------------*/
1108
1109 static unsigned int dummy_get_ep_idx(const struct usb_endpoint_descriptor *desc)
1110 {
1111         unsigned int index;
1112
1113         index = usb_endpoint_num(desc) << 1;
1114         if (usb_endpoint_dir_in(desc))
1115                 index |= 1;
1116         return index;
1117 }
1118
1119 /* MASTER/HOST SIDE DRIVER
1120  *
1121  * this uses the hcd framework to hook up to host side drivers.
1122  * its root hub will only have one device, otherwise it acts like
1123  * a normal host controller.
1124  *
1125  * when urbs are queued, they're just stuck on a list that we
1126  * scan in a timer callback.  that callback connects writes from
1127  * the host with reads from the device, and so on, based on the
1128  * usb 2.0 rules.
1129  */
1130
1131 static int dummy_ep_stream_en(struct dummy_hcd *dum_hcd, struct urb *urb)
1132 {
1133         const struct usb_endpoint_descriptor *desc = &urb->ep->desc;
1134         u32 index;
1135
1136         if (!usb_endpoint_xfer_bulk(desc))
1137                 return 0;
1138
1139         index = dummy_get_ep_idx(desc);
1140         return (1 << index) & dum_hcd->stream_en_ep;
1141 }
1142
1143 /*
1144  * The max stream number is saved as a nibble so for the 30 possible endpoints
1145  * we only 15 bytes of memory. Therefore we are limited to max 16 streams (0
1146  * means we use only 1 stream). The maximum according to the spec is 16bit so
1147  * if the 16 stream limit is about to go, the array size should be incremented
1148  * to 30 elements of type u16.
1149  */
1150 static int get_max_streams_for_pipe(struct dummy_hcd *dum_hcd,
1151                 unsigned int pipe)
1152 {
1153         int max_streams;
1154
1155         max_streams = dum_hcd->num_stream[usb_pipeendpoint(pipe)];
1156         if (usb_pipeout(pipe))
1157                 max_streams >>= 4;
1158         else
1159                 max_streams &= 0xf;
1160         max_streams++;
1161         return max_streams;
1162 }
1163
1164 static void set_max_streams_for_pipe(struct dummy_hcd *dum_hcd,
1165                 unsigned int pipe, unsigned int streams)
1166 {
1167         int max_streams;
1168
1169         streams--;
1170         max_streams = dum_hcd->num_stream[usb_pipeendpoint(pipe)];
1171         if (usb_pipeout(pipe)) {
1172                 streams <<= 4;
1173                 max_streams &= 0xf;
1174         } else {
1175                 max_streams &= 0xf0;
1176         }
1177         max_streams |= streams;
1178         dum_hcd->num_stream[usb_pipeendpoint(pipe)] = max_streams;
1179 }
1180
1181 static int dummy_validate_stream(struct dummy_hcd *dum_hcd, struct urb *urb)
1182 {
1183         unsigned int max_streams;
1184         int enabled;
1185
1186         enabled = dummy_ep_stream_en(dum_hcd, urb);
1187         if (!urb->stream_id) {
1188                 if (enabled)
1189                         return -EINVAL;
1190                 return 0;
1191         }
1192         if (!enabled)
1193                 return -EINVAL;
1194
1195         max_streams = get_max_streams_for_pipe(dum_hcd,
1196                         usb_pipeendpoint(urb->pipe));
1197         if (urb->stream_id > max_streams) {
1198                 dev_err(dummy_dev(dum_hcd), "Stream id %d is out of range.\n",
1199                                 urb->stream_id);
1200                 BUG();
1201                 return -EINVAL;
1202         }
1203         return 0;
1204 }
1205
1206 static int dummy_urb_enqueue(
1207         struct usb_hcd                  *hcd,
1208         struct urb                      *urb,
1209         gfp_t                           mem_flags
1210 ) {
1211         struct dummy_hcd *dum_hcd;
1212         struct urbp     *urbp;
1213         unsigned long   flags;
1214         int             rc;
1215
1216         urbp = kmalloc(sizeof *urbp, mem_flags);
1217         if (!urbp)
1218                 return -ENOMEM;
1219         urbp->urb = urb;
1220         urbp->miter_started = 0;
1221
1222         dum_hcd = hcd_to_dummy_hcd(hcd);
1223         spin_lock_irqsave(&dum_hcd->dum->lock, flags);
1224
1225         rc = dummy_validate_stream(dum_hcd, urb);
1226         if (rc) {
1227                 kfree(urbp);
1228                 goto done;
1229         }
1230
1231         rc = usb_hcd_link_urb_to_ep(hcd, urb);
1232         if (rc) {
1233                 kfree(urbp);
1234                 goto done;
1235         }
1236
1237         if (!dum_hcd->udev) {
1238                 dum_hcd->udev = urb->dev;
1239                 usb_get_dev(dum_hcd->udev);
1240         } else if (unlikely(dum_hcd->udev != urb->dev))
1241                 dev_err(dummy_dev(dum_hcd), "usb_device address has changed!\n");
1242
1243         list_add_tail(&urbp->urbp_list, &dum_hcd->urbp_list);
1244         urb->hcpriv = urbp;
1245         if (usb_pipetype(urb->pipe) == PIPE_CONTROL)
1246                 urb->error_count = 1;           /* mark as a new urb */
1247
1248         /* kick the scheduler, it'll do the rest */
1249         if (!timer_pending(&dum_hcd->timer))
1250                 mod_timer(&dum_hcd->timer, jiffies + 1);
1251
1252  done:
1253         spin_unlock_irqrestore(&dum_hcd->dum->lock, flags);
1254         return rc;
1255 }
1256
1257 static int dummy_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
1258 {
1259         struct dummy_hcd *dum_hcd;
1260         unsigned long   flags;
1261         int             rc;
1262
1263         /* giveback happens automatically in timer callback,
1264          * so make sure the callback happens */
1265         dum_hcd = hcd_to_dummy_hcd(hcd);
1266         spin_lock_irqsave(&dum_hcd->dum->lock, flags);
1267
1268         rc = usb_hcd_check_unlink_urb(hcd, urb, status);
1269         if (!rc && dum_hcd->rh_state != DUMMY_RH_RUNNING &&
1270                         !list_empty(&dum_hcd->urbp_list))
1271                 mod_timer(&dum_hcd->timer, jiffies);
1272
1273         spin_unlock_irqrestore(&dum_hcd->dum->lock, flags);
1274         return rc;
1275 }
1276
1277 static int dummy_perform_transfer(struct urb *urb, struct dummy_request *req,
1278                 u32 len)
1279 {
1280         void *ubuf, *rbuf;
1281         struct urbp *urbp = urb->hcpriv;
1282         int to_host;
1283         struct sg_mapping_iter *miter = &urbp->miter;
1284         u32 trans = 0;
1285         u32 this_sg;
1286         bool next_sg;
1287
1288         to_host = usb_pipein(urb->pipe);
1289         rbuf = req->req.buf + req->req.actual;
1290
1291         if (!urb->num_sgs) {
1292                 ubuf = urb->transfer_buffer + urb->actual_length;
1293                 if (to_host)
1294                         memcpy(ubuf, rbuf, len);
1295                 else
1296                         memcpy(rbuf, ubuf, len);
1297                 return len;
1298         }
1299
1300         if (!urbp->miter_started) {
1301                 u32 flags = SG_MITER_ATOMIC;
1302
1303                 if (to_host)
1304                         flags |= SG_MITER_TO_SG;
1305                 else
1306                         flags |= SG_MITER_FROM_SG;
1307
1308                 sg_miter_start(miter, urb->sg, urb->num_sgs, flags);
1309                 urbp->miter_started = 1;
1310         }
1311         next_sg = sg_miter_next(miter);
1312         if (next_sg == false) {
1313                 WARN_ON_ONCE(1);
1314                 return -EINVAL;
1315         }
1316         do {
1317                 ubuf = miter->addr;
1318                 this_sg = min_t(u32, len, miter->length);
1319                 miter->consumed = this_sg;
1320                 trans += this_sg;
1321
1322                 if (to_host)
1323                         memcpy(ubuf, rbuf, this_sg);
1324                 else
1325                         memcpy(rbuf, ubuf, this_sg);
1326                 len -= this_sg;
1327
1328                 if (!len)
1329                         break;
1330                 next_sg = sg_miter_next(miter);
1331                 if (next_sg == false) {
1332                         WARN_ON_ONCE(1);
1333                         return -EINVAL;
1334                 }
1335
1336                 rbuf += this_sg;
1337         } while (1);
1338
1339         sg_miter_stop(miter);
1340         return trans;
1341 }
1342
1343 /* transfer up to a frame's worth; caller must own lock */
1344 static int transfer(struct dummy_hcd *dum_hcd, struct urb *urb,
1345                 struct dummy_ep *ep, int limit, int *status)
1346 {
1347         struct dummy            *dum = dum_hcd->dum;
1348         struct dummy_request    *req;
1349         int                     sent = 0;
1350
1351 top:
1352         /* if there's no request queued, the device is NAKing; return */
1353         list_for_each_entry(req, &ep->queue, queue) {
1354                 unsigned        host_len, dev_len, len;
1355                 int             is_short, to_host;
1356                 int             rescan = 0;
1357
1358                 if (dummy_ep_stream_en(dum_hcd, urb)) {
1359                         if ((urb->stream_id != req->req.stream_id))
1360                                 continue;
1361                 }
1362
1363                 /* 1..N packets of ep->ep.maxpacket each ... the last one
1364                  * may be short (including zero length).
1365                  *
1366                  * writer can send a zlp explicitly (length 0) or implicitly
1367                  * (length mod maxpacket zero, and 'zero' flag); they always
1368                  * terminate reads.
1369                  */
1370                 host_len = urb->transfer_buffer_length - urb->actual_length;
1371                 dev_len = req->req.length - req->req.actual;
1372                 len = min(host_len, dev_len);
1373
1374                 /* FIXME update emulated data toggle too */
1375
1376                 to_host = usb_pipein(urb->pipe);
1377                 if (unlikely(len == 0))
1378                         is_short = 1;
1379                 else {
1380                         /* not enough bandwidth left? */
1381                         if (limit < ep->ep.maxpacket && limit < len)
1382                                 break;
1383                         len = min_t(unsigned, len, limit);
1384                         if (len == 0)
1385                                 break;
1386
1387                         /* send multiple of maxpacket first, then remainder */
1388                         if (len >= ep->ep.maxpacket) {
1389                                 is_short = 0;
1390                                 if (len % ep->ep.maxpacket)
1391                                         rescan = 1;
1392                                 len -= len % ep->ep.maxpacket;
1393                         } else {
1394                                 is_short = 1;
1395                         }
1396
1397                         len = dummy_perform_transfer(urb, req, len);
1398
1399                         ep->last_io = jiffies;
1400                         if ((int)len < 0) {
1401                                 req->req.status = len;
1402                         } else {
1403                                 limit -= len;
1404                                 sent += len;
1405                                 urb->actual_length += len;
1406                                 req->req.actual += len;
1407                         }
1408                 }
1409
1410                 /* short packets terminate, maybe with overflow/underflow.
1411                  * it's only really an error to write too much.
1412                  *
1413                  * partially filling a buffer optionally blocks queue advances
1414                  * (so completion handlers can clean up the queue) but we don't
1415                  * need to emulate such data-in-flight.
1416                  */
1417                 if (is_short) {
1418                         if (host_len == dev_len) {
1419                                 req->req.status = 0;
1420                                 *status = 0;
1421                         } else if (to_host) {
1422                                 req->req.status = 0;
1423                                 if (dev_len > host_len)
1424                                         *status = -EOVERFLOW;
1425                                 else
1426                                         *status = 0;
1427                         } else {
1428                                 *status = 0;
1429                                 if (host_len > dev_len)
1430                                         req->req.status = -EOVERFLOW;
1431                                 else
1432                                         req->req.status = 0;
1433                         }
1434
1435                 /*
1436                  * many requests terminate without a short packet.
1437                  * send a zlp if demanded by flags.
1438                  */
1439                 } else {
1440                         if (req->req.length == req->req.actual) {
1441                                 if (req->req.zero && to_host)
1442                                         rescan = 1;
1443                                 else
1444                                         req->req.status = 0;
1445                         }
1446                         if (urb->transfer_buffer_length == urb->actual_length) {
1447                                 if (urb->transfer_flags & URB_ZERO_PACKET &&
1448                                     !to_host)
1449                                         rescan = 1;
1450                                 else
1451                                         *status = 0;
1452                         }
1453                 }
1454
1455                 /* device side completion --> continuable */
1456                 if (req->req.status != -EINPROGRESS) {
1457                         list_del_init(&req->queue);
1458
1459                         spin_unlock(&dum->lock);
1460                         usb_gadget_giveback_request(&ep->ep, &req->req);
1461                         spin_lock(&dum->lock);
1462
1463                         /* requests might have been unlinked... */
1464                         rescan = 1;
1465                 }
1466
1467                 /* host side completion --> terminate */
1468                 if (*status != -EINPROGRESS)
1469                         break;
1470
1471                 /* rescan to continue with any other queued i/o */
1472                 if (rescan)
1473                         goto top;
1474         }
1475         return sent;
1476 }
1477
1478 static int periodic_bytes(struct dummy *dum, struct dummy_ep *ep)
1479 {
1480         int     limit = ep->ep.maxpacket;
1481
1482         if (dum->gadget.speed == USB_SPEED_HIGH) {
1483                 int     tmp;
1484
1485                 /* high bandwidth mode */
1486                 tmp = usb_endpoint_maxp_mult(ep->desc);
1487                 tmp *= 8 /* applies to entire frame */;
1488                 limit += limit * tmp;
1489         }
1490         if (dum->gadget.speed == USB_SPEED_SUPER) {
1491                 switch (usb_endpoint_type(ep->desc)) {
1492                 case USB_ENDPOINT_XFER_ISOC:
1493                         /* Sec. 4.4.8.2 USB3.0 Spec */
1494                         limit = 3 * 16 * 1024 * 8;
1495                         break;
1496                 case USB_ENDPOINT_XFER_INT:
1497                         /* Sec. 4.4.7.2 USB3.0 Spec */
1498                         limit = 3 * 1024 * 8;
1499                         break;
1500                 case USB_ENDPOINT_XFER_BULK:
1501                 default:
1502                         break;
1503                 }
1504         }
1505         return limit;
1506 }
1507
1508 #define is_active(dum_hcd)      ((dum_hcd->port_status & \
1509                 (USB_PORT_STAT_CONNECTION | USB_PORT_STAT_ENABLE | \
1510                         USB_PORT_STAT_SUSPEND)) \
1511                 == (USB_PORT_STAT_CONNECTION | USB_PORT_STAT_ENABLE))
1512
1513 static struct dummy_ep *find_endpoint(struct dummy *dum, u8 address)
1514 {
1515         int             i;
1516
1517         if (!is_active((dum->gadget.speed == USB_SPEED_SUPER ?
1518                         dum->ss_hcd : dum->hs_hcd)))
1519                 return NULL;
1520         if ((address & ~USB_DIR_IN) == 0)
1521                 return &dum->ep[0];
1522         for (i = 1; i < DUMMY_ENDPOINTS; i++) {
1523                 struct dummy_ep *ep = &dum->ep[i];
1524
1525                 if (!ep->desc)
1526                         continue;
1527                 if (ep->desc->bEndpointAddress == address)
1528                         return ep;
1529         }
1530         return NULL;
1531 }
1532
1533 #undef is_active
1534
1535 #define Dev_Request     (USB_TYPE_STANDARD | USB_RECIP_DEVICE)
1536 #define Dev_InRequest   (Dev_Request | USB_DIR_IN)
1537 #define Intf_Request    (USB_TYPE_STANDARD | USB_RECIP_INTERFACE)
1538 #define Intf_InRequest  (Intf_Request | USB_DIR_IN)
1539 #define Ep_Request      (USB_TYPE_STANDARD | USB_RECIP_ENDPOINT)
1540 #define Ep_InRequest    (Ep_Request | USB_DIR_IN)
1541
1542
1543 /**
1544  * handle_control_request() - handles all control transfers
1545  * @dum: pointer to dummy (the_controller)
1546  * @urb: the urb request to handle
1547  * @setup: pointer to the setup data for a USB device control
1548  *       request
1549  * @status: pointer to request handling status
1550  *
1551  * Return 0 - if the request was handled
1552  *        1 - if the request wasn't handles
1553  *        error code on error
1554  */
1555 static int handle_control_request(struct dummy_hcd *dum_hcd, struct urb *urb,
1556                                   struct usb_ctrlrequest *setup,
1557                                   int *status)
1558 {
1559         struct dummy_ep         *ep2;
1560         struct dummy            *dum = dum_hcd->dum;
1561         int                     ret_val = 1;
1562         unsigned        w_index;
1563         unsigned        w_value;
1564
1565         w_index = le16_to_cpu(setup->wIndex);
1566         w_value = le16_to_cpu(setup->wValue);
1567         switch (setup->bRequest) {
1568         case USB_REQ_SET_ADDRESS:
1569                 if (setup->bRequestType != Dev_Request)
1570                         break;
1571                 dum->address = w_value;
1572                 *status = 0;
1573                 dev_dbg(udc_dev(dum), "set_address = %d\n",
1574                                 w_value);
1575                 ret_val = 0;
1576                 break;
1577         case USB_REQ_SET_FEATURE:
1578                 if (setup->bRequestType == Dev_Request) {
1579                         ret_val = 0;
1580                         switch (w_value) {
1581                         case USB_DEVICE_REMOTE_WAKEUP:
1582                                 break;
1583                         case USB_DEVICE_B_HNP_ENABLE:
1584                                 dum->gadget.b_hnp_enable = 1;
1585                                 break;
1586                         case USB_DEVICE_A_HNP_SUPPORT:
1587                                 dum->gadget.a_hnp_support = 1;
1588                                 break;
1589                         case USB_DEVICE_A_ALT_HNP_SUPPORT:
1590                                 dum->gadget.a_alt_hnp_support = 1;
1591                                 break;
1592                         case USB_DEVICE_U1_ENABLE:
1593                                 if (dummy_hcd_to_hcd(dum_hcd)->speed ==
1594                                     HCD_USB3)
1595                                         w_value = USB_DEV_STAT_U1_ENABLED;
1596                                 else
1597                                         ret_val = -EOPNOTSUPP;
1598                                 break;
1599                         case USB_DEVICE_U2_ENABLE:
1600                                 if (dummy_hcd_to_hcd(dum_hcd)->speed ==
1601                                     HCD_USB3)
1602                                         w_value = USB_DEV_STAT_U2_ENABLED;
1603                                 else
1604                                         ret_val = -EOPNOTSUPP;
1605                                 break;
1606                         case USB_DEVICE_LTM_ENABLE:
1607                                 if (dummy_hcd_to_hcd(dum_hcd)->speed ==
1608                                     HCD_USB3)
1609                                         w_value = USB_DEV_STAT_LTM_ENABLED;
1610                                 else
1611                                         ret_val = -EOPNOTSUPP;
1612                                 break;
1613                         default:
1614                                 ret_val = -EOPNOTSUPP;
1615                         }
1616                         if (ret_val == 0) {
1617                                 dum->devstatus |= (1 << w_value);
1618                                 *status = 0;
1619                         }
1620                 } else if (setup->bRequestType == Ep_Request) {
1621                         /* endpoint halt */
1622                         ep2 = find_endpoint(dum, w_index);
1623                         if (!ep2 || ep2->ep.name == ep0name) {
1624                                 ret_val = -EOPNOTSUPP;
1625                                 break;
1626                         }
1627                         ep2->halted = 1;
1628                         ret_val = 0;
1629                         *status = 0;
1630                 }
1631                 break;
1632         case USB_REQ_CLEAR_FEATURE:
1633                 if (setup->bRequestType == Dev_Request) {
1634                         ret_val = 0;
1635                         switch (w_value) {
1636                         case USB_DEVICE_REMOTE_WAKEUP:
1637                                 w_value = USB_DEVICE_REMOTE_WAKEUP;
1638                                 break;
1639                         case USB_DEVICE_U1_ENABLE:
1640                                 if (dummy_hcd_to_hcd(dum_hcd)->speed ==
1641                                     HCD_USB3)
1642                                         w_value = USB_DEV_STAT_U1_ENABLED;
1643                                 else
1644                                         ret_val = -EOPNOTSUPP;
1645                                 break;
1646                         case USB_DEVICE_U2_ENABLE:
1647                                 if (dummy_hcd_to_hcd(dum_hcd)->speed ==
1648                                     HCD_USB3)
1649                                         w_value = USB_DEV_STAT_U2_ENABLED;
1650                                 else
1651                                         ret_val = -EOPNOTSUPP;
1652                                 break;
1653                         case USB_DEVICE_LTM_ENABLE:
1654                                 if (dummy_hcd_to_hcd(dum_hcd)->speed ==
1655                                     HCD_USB3)
1656                                         w_value = USB_DEV_STAT_LTM_ENABLED;
1657                                 else
1658                                         ret_val = -EOPNOTSUPP;
1659                                 break;
1660                         default:
1661                                 ret_val = -EOPNOTSUPP;
1662                                 break;
1663                         }
1664                         if (ret_val == 0) {
1665                                 dum->devstatus &= ~(1 << w_value);
1666                                 *status = 0;
1667                         }
1668                 } else if (setup->bRequestType == Ep_Request) {
1669                         /* endpoint halt */
1670                         ep2 = find_endpoint(dum, w_index);
1671                         if (!ep2) {
1672                                 ret_val = -EOPNOTSUPP;
1673                                 break;
1674                         }
1675                         if (!ep2->wedged)
1676                                 ep2->halted = 0;
1677                         ret_val = 0;
1678                         *status = 0;
1679                 }
1680                 break;
1681         case USB_REQ_GET_STATUS:
1682                 if (setup->bRequestType == Dev_InRequest
1683                                 || setup->bRequestType == Intf_InRequest
1684                                 || setup->bRequestType == Ep_InRequest) {
1685                         char *buf;
1686                         /*
1687                          * device: remote wakeup, selfpowered
1688                          * interface: nothing
1689                          * endpoint: halt
1690                          */
1691                         buf = (char *)urb->transfer_buffer;
1692                         if (urb->transfer_buffer_length > 0) {
1693                                 if (setup->bRequestType == Ep_InRequest) {
1694                                         ep2 = find_endpoint(dum, w_index);
1695                                         if (!ep2) {
1696                                                 ret_val = -EOPNOTSUPP;
1697                                                 break;
1698                                         }
1699                                         buf[0] = ep2->halted;
1700                                 } else if (setup->bRequestType ==
1701                                            Dev_InRequest) {
1702                                         buf[0] = (u8)dum->devstatus;
1703                                 } else
1704                                         buf[0] = 0;
1705                         }
1706                         if (urb->transfer_buffer_length > 1)
1707                                 buf[1] = 0;
1708                         urb->actual_length = min_t(u32, 2,
1709                                 urb->transfer_buffer_length);
1710                         ret_val = 0;
1711                         *status = 0;
1712                 }
1713                 break;
1714         }
1715         return ret_val;
1716 }
1717
1718 /* drive both sides of the transfers; looks like irq handlers to
1719  * both drivers except the callbacks aren't in_irq().
1720  */
1721 static void dummy_timer(unsigned long _dum_hcd)
1722 {
1723         struct dummy_hcd        *dum_hcd = (struct dummy_hcd *) _dum_hcd;
1724         struct dummy            *dum = dum_hcd->dum;
1725         struct urbp             *urbp, *tmp;
1726         unsigned long           flags;
1727         int                     limit, total;
1728         int                     i;
1729
1730         /* simplistic model for one frame's bandwidth */
1731         switch (dum->gadget.speed) {
1732         case USB_SPEED_LOW:
1733                 total = 8/*bytes*/ * 12/*packets*/;
1734                 break;
1735         case USB_SPEED_FULL:
1736                 total = 64/*bytes*/ * 19/*packets*/;
1737                 break;
1738         case USB_SPEED_HIGH:
1739                 total = 512/*bytes*/ * 13/*packets*/ * 8/*uframes*/;
1740                 break;
1741         case USB_SPEED_SUPER:
1742                 /* Bus speed is 500000 bytes/ms, so use a little less */
1743                 total = 490000;
1744                 break;
1745         default:
1746                 dev_err(dummy_dev(dum_hcd), "bogus device speed\n");
1747                 return;
1748         }
1749
1750         /* FIXME if HZ != 1000 this will probably misbehave ... */
1751
1752         /* look at each urb queued by the host side driver */
1753         spin_lock_irqsave(&dum->lock, flags);
1754
1755         if (!dum_hcd->udev) {
1756                 dev_err(dummy_dev(dum_hcd),
1757                                 "timer fired with no URBs pending?\n");
1758                 spin_unlock_irqrestore(&dum->lock, flags);
1759                 return;
1760         }
1761
1762         for (i = 0; i < DUMMY_ENDPOINTS; i++) {
1763                 if (!ep_info[i].name)
1764                         break;
1765                 dum->ep[i].already_seen = 0;
1766         }
1767
1768 restart:
1769         list_for_each_entry_safe(urbp, tmp, &dum_hcd->urbp_list, urbp_list) {
1770                 struct urb              *urb;
1771                 struct dummy_request    *req;
1772                 u8                      address;
1773                 struct dummy_ep         *ep = NULL;
1774                 int                     type;
1775                 int                     status = -EINPROGRESS;
1776
1777                 urb = urbp->urb;
1778                 if (urb->unlinked)
1779                         goto return_urb;
1780                 else if (dum_hcd->rh_state != DUMMY_RH_RUNNING)
1781                         continue;
1782                 type = usb_pipetype(urb->pipe);
1783
1784                 /* used up this frame's non-periodic bandwidth?
1785                  * FIXME there's infinite bandwidth for control and
1786                  * periodic transfers ... unrealistic.
1787                  */
1788                 if (total <= 0 && type == PIPE_BULK)
1789                         continue;
1790
1791                 /* find the gadget's ep for this request (if configured) */
1792                 address = usb_pipeendpoint (urb->pipe);
1793                 if (usb_pipein(urb->pipe))
1794                         address |= USB_DIR_IN;
1795                 ep = find_endpoint(dum, address);
1796                 if (!ep) {
1797                         /* set_configuration() disagreement */
1798                         dev_dbg(dummy_dev(dum_hcd),
1799                                 "no ep configured for urb %p\n",
1800                                 urb);
1801                         status = -EPROTO;
1802                         goto return_urb;
1803                 }
1804
1805                 if (ep->already_seen)
1806                         continue;
1807                 ep->already_seen = 1;
1808                 if (ep == &dum->ep[0] && urb->error_count) {
1809                         ep->setup_stage = 1;    /* a new urb */
1810                         urb->error_count = 0;
1811                 }
1812                 if (ep->halted && !ep->setup_stage) {
1813                         /* NOTE: must not be iso! */
1814                         dev_dbg(dummy_dev(dum_hcd), "ep %s halted, urb %p\n",
1815                                         ep->ep.name, urb);
1816                         status = -EPIPE;
1817                         goto return_urb;
1818                 }
1819                 /* FIXME make sure both ends agree on maxpacket */
1820
1821                 /* handle control requests */
1822                 if (ep == &dum->ep[0] && ep->setup_stage) {
1823                         struct usb_ctrlrequest          setup;
1824                         int                             value = 1;
1825
1826                         setup = *(struct usb_ctrlrequest *) urb->setup_packet;
1827                         /* paranoia, in case of stale queued data */
1828                         list_for_each_entry(req, &ep->queue, queue) {
1829                                 list_del_init(&req->queue);
1830                                 req->req.status = -EOVERFLOW;
1831                                 dev_dbg(udc_dev(dum), "stale req = %p\n",
1832                                                 req);
1833
1834                                 spin_unlock(&dum->lock);
1835                                 usb_gadget_giveback_request(&ep->ep, &req->req);
1836                                 spin_lock(&dum->lock);
1837                                 ep->already_seen = 0;
1838                                 goto restart;
1839                         }
1840
1841                         /* gadget driver never sees set_address or operations
1842                          * on standard feature flags.  some hardware doesn't
1843                          * even expose them.
1844                          */
1845                         ep->last_io = jiffies;
1846                         ep->setup_stage = 0;
1847                         ep->halted = 0;
1848
1849                         value = handle_control_request(dum_hcd, urb, &setup,
1850                                                        &status);
1851
1852                         /* gadget driver handles all other requests.  block
1853                          * until setup() returns; no reentrancy issues etc.
1854                          */
1855                         if (value > 0) {
1856                                 spin_unlock(&dum->lock);
1857                                 value = dum->driver->setup(&dum->gadget,
1858                                                 &setup);
1859                                 spin_lock(&dum->lock);
1860
1861                                 if (value >= 0) {
1862                                         /* no delays (max 64KB data stage) */
1863                                         limit = 64*1024;
1864                                         goto treat_control_like_bulk;
1865                                 }
1866                                 /* error, see below */
1867                         }
1868
1869                         if (value < 0) {
1870                                 if (value != -EOPNOTSUPP)
1871                                         dev_dbg(udc_dev(dum),
1872                                                 "setup --> %d\n",
1873                                                 value);
1874                                 status = -EPIPE;
1875                                 urb->actual_length = 0;
1876                         }
1877
1878                         goto return_urb;
1879                 }
1880
1881                 /* non-control requests */
1882                 limit = total;
1883                 switch (usb_pipetype(urb->pipe)) {
1884                 case PIPE_ISOCHRONOUS:
1885                         /* FIXME is it urb->interval since the last xfer?
1886                          * use urb->iso_frame_desc[i].
1887                          * complete whether or not ep has requests queued.
1888                          * report random errors, to debug drivers.
1889                          */
1890                         limit = max(limit, periodic_bytes(dum, ep));
1891                         status = -ENOSYS;
1892                         break;
1893
1894                 case PIPE_INTERRUPT:
1895                         /* FIXME is it urb->interval since the last xfer?
1896                          * this almost certainly polls too fast.
1897                          */
1898                         limit = max(limit, periodic_bytes(dum, ep));
1899                         /* FALLTHROUGH */
1900
1901                 default:
1902 treat_control_like_bulk:
1903                         ep->last_io = jiffies;
1904                         total -= transfer(dum_hcd, urb, ep, limit, &status);
1905                         break;
1906                 }
1907
1908                 /* incomplete transfer? */
1909                 if (status == -EINPROGRESS)
1910                         continue;
1911
1912 return_urb:
1913                 list_del(&urbp->urbp_list);
1914                 kfree(urbp);
1915                 if (ep)
1916                         ep->already_seen = ep->setup_stage = 0;
1917
1918                 usb_hcd_unlink_urb_from_ep(dummy_hcd_to_hcd(dum_hcd), urb);
1919                 spin_unlock(&dum->lock);
1920                 usb_hcd_giveback_urb(dummy_hcd_to_hcd(dum_hcd), urb, status);
1921                 spin_lock(&dum->lock);
1922
1923                 goto restart;
1924         }
1925
1926         if (list_empty(&dum_hcd->urbp_list)) {
1927                 usb_put_dev(dum_hcd->udev);
1928                 dum_hcd->udev = NULL;
1929         } else if (dum_hcd->rh_state == DUMMY_RH_RUNNING) {
1930                 /* want a 1 msec delay here */
1931                 mod_timer(&dum_hcd->timer, jiffies + msecs_to_jiffies(1));
1932         }
1933
1934         spin_unlock_irqrestore(&dum->lock, flags);
1935 }
1936
1937 /*-------------------------------------------------------------------------*/
1938
1939 #define PORT_C_MASK \
1940         ((USB_PORT_STAT_C_CONNECTION \
1941         | USB_PORT_STAT_C_ENABLE \
1942         | USB_PORT_STAT_C_SUSPEND \
1943         | USB_PORT_STAT_C_OVERCURRENT \
1944         | USB_PORT_STAT_C_RESET) << 16)
1945
1946 static int dummy_hub_status(struct usb_hcd *hcd, char *buf)
1947 {
1948         struct dummy_hcd        *dum_hcd;
1949         unsigned long           flags;
1950         int                     retval = 0;
1951
1952         dum_hcd = hcd_to_dummy_hcd(hcd);
1953
1954         spin_lock_irqsave(&dum_hcd->dum->lock, flags);
1955         if (!HCD_HW_ACCESSIBLE(hcd))
1956                 goto done;
1957
1958         if (dum_hcd->resuming && time_after_eq(jiffies, dum_hcd->re_timeout)) {
1959                 dum_hcd->port_status |= (USB_PORT_STAT_C_SUSPEND << 16);
1960                 dum_hcd->port_status &= ~USB_PORT_STAT_SUSPEND;
1961                 set_link_state(dum_hcd);
1962         }
1963
1964         if ((dum_hcd->port_status & PORT_C_MASK) != 0) {
1965                 *buf = (1 << 1);
1966                 dev_dbg(dummy_dev(dum_hcd), "port status 0x%08x has changes\n",
1967                                 dum_hcd->port_status);
1968                 retval = 1;
1969                 if (dum_hcd->rh_state == DUMMY_RH_SUSPENDED)
1970                         usb_hcd_resume_root_hub(hcd);
1971         }
1972 done:
1973         spin_unlock_irqrestore(&dum_hcd->dum->lock, flags);
1974         return retval;
1975 }
1976
1977 /* usb 3.0 root hub device descriptor */
1978 static struct {
1979         struct usb_bos_descriptor bos;
1980         struct usb_ss_cap_descriptor ss_cap;
1981 } __packed usb3_bos_desc = {
1982
1983         .bos = {
1984                 .bLength                = USB_DT_BOS_SIZE,
1985                 .bDescriptorType        = USB_DT_BOS,
1986                 .wTotalLength           = cpu_to_le16(sizeof(usb3_bos_desc)),
1987                 .bNumDeviceCaps         = 1,
1988         },
1989         .ss_cap = {
1990                 .bLength                = USB_DT_USB_SS_CAP_SIZE,
1991                 .bDescriptorType        = USB_DT_DEVICE_CAPABILITY,
1992                 .bDevCapabilityType     = USB_SS_CAP_TYPE,
1993                 .wSpeedSupported        = cpu_to_le16(USB_5GBPS_OPERATION),
1994                 .bFunctionalitySupport  = ilog2(USB_5GBPS_OPERATION),
1995         },
1996 };
1997
1998 static inline void
1999 ss_hub_descriptor(struct usb_hub_descriptor *desc)
2000 {
2001         memset(desc, 0, sizeof *desc);
2002         desc->bDescriptorType = USB_DT_SS_HUB;
2003         desc->bDescLength = 12;
2004         desc->wHubCharacteristics = cpu_to_le16(
2005                         HUB_CHAR_INDV_PORT_LPSM |
2006                         HUB_CHAR_COMMON_OCPM);
2007         desc->bNbrPorts = 1;
2008         desc->u.ss.bHubHdrDecLat = 0x04; /* Worst case: 0.4 micro sec*/
2009         desc->u.ss.DeviceRemovable = 0xffff;
2010 }
2011
2012 static inline void hub_descriptor(struct usb_hub_descriptor *desc)
2013 {
2014         memset(desc, 0, sizeof *desc);
2015         desc->bDescriptorType = USB_DT_HUB;
2016         desc->bDescLength = 9;
2017         desc->wHubCharacteristics = cpu_to_le16(
2018                         HUB_CHAR_INDV_PORT_LPSM |
2019                         HUB_CHAR_COMMON_OCPM);
2020         desc->bNbrPorts = 1;
2021         desc->u.hs.DeviceRemovable[0] = 0xff;
2022         desc->u.hs.DeviceRemovable[1] = 0xff;
2023 }
2024
2025 static int dummy_hub_control(
2026         struct usb_hcd  *hcd,
2027         u16             typeReq,
2028         u16             wValue,
2029         u16             wIndex,
2030         char            *buf,
2031         u16             wLength
2032 ) {
2033         struct dummy_hcd *dum_hcd;
2034         int             retval = 0;
2035         unsigned long   flags;
2036
2037         if (!HCD_HW_ACCESSIBLE(hcd))
2038                 return -ETIMEDOUT;
2039
2040         dum_hcd = hcd_to_dummy_hcd(hcd);
2041
2042         spin_lock_irqsave(&dum_hcd->dum->lock, flags);
2043         switch (typeReq) {
2044         case ClearHubFeature:
2045                 break;
2046         case ClearPortFeature:
2047                 switch (wValue) {
2048                 case USB_PORT_FEAT_SUSPEND:
2049                         if (hcd->speed == HCD_USB3) {
2050                                 dev_dbg(dummy_dev(dum_hcd),
2051                                          "USB_PORT_FEAT_SUSPEND req not "
2052                                          "supported for USB 3.0 roothub\n");
2053                                 goto error;
2054                         }
2055                         if (dum_hcd->port_status & USB_PORT_STAT_SUSPEND) {
2056                                 /* 20msec resume signaling */
2057                                 dum_hcd->resuming = 1;
2058                                 dum_hcd->re_timeout = jiffies +
2059                                                 msecs_to_jiffies(20);
2060                         }
2061                         break;
2062                 case USB_PORT_FEAT_POWER:
2063                         if (hcd->speed == HCD_USB3) {
2064                                 if (dum_hcd->port_status & USB_PORT_STAT_POWER)
2065                                         dev_dbg(dummy_dev(dum_hcd),
2066                                                 "power-off\n");
2067                         } else
2068                                 if (dum_hcd->port_status &
2069                                                         USB_SS_PORT_STAT_POWER)
2070                                         dev_dbg(dummy_dev(dum_hcd),
2071                                                 "power-off\n");
2072                         /* FALLS THROUGH */
2073                 default:
2074                         dum_hcd->port_status &= ~(1 << wValue);
2075                         set_link_state(dum_hcd);
2076                 }
2077                 break;
2078         case GetHubDescriptor:
2079                 if (hcd->speed == HCD_USB3 &&
2080                                 (wLength < USB_DT_SS_HUB_SIZE ||
2081                                  wValue != (USB_DT_SS_HUB << 8))) {
2082                         dev_dbg(dummy_dev(dum_hcd),
2083                                 "Wrong hub descriptor type for "
2084                                 "USB 3.0 roothub.\n");
2085                         goto error;
2086                 }
2087                 if (hcd->speed == HCD_USB3)
2088                         ss_hub_descriptor((struct usb_hub_descriptor *) buf);
2089                 else
2090                         hub_descriptor((struct usb_hub_descriptor *) buf);
2091                 break;
2092
2093         case DeviceRequest | USB_REQ_GET_DESCRIPTOR:
2094                 if (hcd->speed != HCD_USB3)
2095                         goto error;
2096
2097                 if ((wValue >> 8) != USB_DT_BOS)
2098                         goto error;
2099
2100                 memcpy(buf, &usb3_bos_desc, sizeof(usb3_bos_desc));
2101                 retval = sizeof(usb3_bos_desc);
2102                 break;
2103
2104         case GetHubStatus:
2105                 *(__le32 *) buf = cpu_to_le32(0);
2106                 break;
2107         case GetPortStatus:
2108                 if (wIndex != 1)
2109                         retval = -EPIPE;
2110
2111                 /* whoever resets or resumes must GetPortStatus to
2112                  * complete it!!
2113                  */
2114                 if (dum_hcd->resuming &&
2115                                 time_after_eq(jiffies, dum_hcd->re_timeout)) {
2116                         dum_hcd->port_status |= (USB_PORT_STAT_C_SUSPEND << 16);
2117                         dum_hcd->port_status &= ~USB_PORT_STAT_SUSPEND;
2118                 }
2119                 if ((dum_hcd->port_status & USB_PORT_STAT_RESET) != 0 &&
2120                                 time_after_eq(jiffies, dum_hcd->re_timeout)) {
2121                         dum_hcd->port_status |= (USB_PORT_STAT_C_RESET << 16);
2122                         dum_hcd->port_status &= ~USB_PORT_STAT_RESET;
2123                         if (dum_hcd->dum->pullup) {
2124                                 dum_hcd->port_status |= USB_PORT_STAT_ENABLE;
2125
2126                                 if (hcd->speed < HCD_USB3) {
2127                                         switch (dum_hcd->dum->gadget.speed) {
2128                                         case USB_SPEED_HIGH:
2129                                                 dum_hcd->port_status |=
2130                                                       USB_PORT_STAT_HIGH_SPEED;
2131                                                 break;
2132                                         case USB_SPEED_LOW:
2133                                                 dum_hcd->dum->gadget.ep0->
2134                                                         maxpacket = 8;
2135                                                 dum_hcd->port_status |=
2136                                                         USB_PORT_STAT_LOW_SPEED;
2137                                                 break;
2138                                         default:
2139                                                 dum_hcd->dum->gadget.speed =
2140                                                         USB_SPEED_FULL;
2141                                                 break;
2142                                         }
2143                                 }
2144                         }
2145                 }
2146                 set_link_state(dum_hcd);
2147                 ((__le16 *) buf)[0] = cpu_to_le16(dum_hcd->port_status);
2148                 ((__le16 *) buf)[1] = cpu_to_le16(dum_hcd->port_status >> 16);
2149                 break;
2150         case SetHubFeature:
2151                 retval = -EPIPE;
2152                 break;
2153         case SetPortFeature:
2154                 switch (wValue) {
2155                 case USB_PORT_FEAT_LINK_STATE:
2156                         if (hcd->speed != HCD_USB3) {
2157                                 dev_dbg(dummy_dev(dum_hcd),
2158                                          "USB_PORT_FEAT_LINK_STATE req not "
2159                                          "supported for USB 2.0 roothub\n");
2160                                 goto error;
2161                         }
2162                         /*
2163                          * Since this is dummy we don't have an actual link so
2164                          * there is nothing to do for the SET_LINK_STATE cmd
2165                          */
2166                         break;
2167                 case USB_PORT_FEAT_U1_TIMEOUT:
2168                 case USB_PORT_FEAT_U2_TIMEOUT:
2169                         /* TODO: add suspend/resume support! */
2170                         if (hcd->speed != HCD_USB3) {
2171                                 dev_dbg(dummy_dev(dum_hcd),
2172                                          "USB_PORT_FEAT_U1/2_TIMEOUT req not "
2173                                          "supported for USB 2.0 roothub\n");
2174                                 goto error;
2175                         }
2176                         break;
2177                 case USB_PORT_FEAT_SUSPEND:
2178                         /* Applicable only for USB2.0 hub */
2179                         if (hcd->speed == HCD_USB3) {
2180                                 dev_dbg(dummy_dev(dum_hcd),
2181                                          "USB_PORT_FEAT_SUSPEND req not "
2182                                          "supported for USB 3.0 roothub\n");
2183                                 goto error;
2184                         }
2185                         if (dum_hcd->active) {
2186                                 dum_hcd->port_status |= USB_PORT_STAT_SUSPEND;
2187
2188                                 /* HNP would happen here; for now we
2189                                  * assume b_bus_req is always true.
2190                                  */
2191                                 set_link_state(dum_hcd);
2192                                 if (((1 << USB_DEVICE_B_HNP_ENABLE)
2193                                                 & dum_hcd->dum->devstatus) != 0)
2194                                         dev_dbg(dummy_dev(dum_hcd),
2195                                                         "no HNP yet!\n");
2196                         }
2197                         break;
2198                 case USB_PORT_FEAT_POWER:
2199                         if (hcd->speed == HCD_USB3)
2200                                 dum_hcd->port_status |= USB_SS_PORT_STAT_POWER;
2201                         else
2202                                 dum_hcd->port_status |= USB_PORT_STAT_POWER;
2203                         set_link_state(dum_hcd);
2204                         break;
2205                 case USB_PORT_FEAT_BH_PORT_RESET:
2206                         /* Applicable only for USB3.0 hub */
2207                         if (hcd->speed != HCD_USB3) {
2208                                 dev_dbg(dummy_dev(dum_hcd),
2209                                          "USB_PORT_FEAT_BH_PORT_RESET req not "
2210                                          "supported for USB 2.0 roothub\n");
2211                                 goto error;
2212                         }
2213                         /* FALLS THROUGH */
2214                 case USB_PORT_FEAT_RESET:
2215                         /* if it's already enabled, disable */
2216                         if (hcd->speed == HCD_USB3) {
2217                                 dum_hcd->port_status = 0;
2218                                 dum_hcd->port_status =
2219                                         (USB_SS_PORT_STAT_POWER |
2220                                          USB_PORT_STAT_CONNECTION |
2221                                          USB_PORT_STAT_RESET);
2222                         } else
2223                                 dum_hcd->port_status &= ~(USB_PORT_STAT_ENABLE
2224                                         | USB_PORT_STAT_LOW_SPEED
2225                                         | USB_PORT_STAT_HIGH_SPEED);
2226                         /*
2227                          * We want to reset device status. All but the
2228                          * Self powered feature
2229                          */
2230                         dum_hcd->dum->devstatus &=
2231                                 (1 << USB_DEVICE_SELF_POWERED);
2232                         /*
2233                          * FIXME USB3.0: what is the correct reset signaling
2234                          * interval? Is it still 50msec as for HS?
2235                          */
2236                         dum_hcd->re_timeout = jiffies + msecs_to_jiffies(50);
2237                         /* FALLS THROUGH */
2238                 default:
2239                         if (hcd->speed == HCD_USB3) {
2240                                 if ((dum_hcd->port_status &
2241                                      USB_SS_PORT_STAT_POWER) != 0) {
2242                                         dum_hcd->port_status |= (1 << wValue);
2243                                         set_link_state(dum_hcd);
2244                                 }
2245                         } else
2246                                 if ((dum_hcd->port_status &
2247                                      USB_PORT_STAT_POWER) != 0) {
2248                                         dum_hcd->port_status |= (1 << wValue);
2249                                         set_link_state(dum_hcd);
2250                                 }
2251                 }
2252                 break;
2253         case GetPortErrorCount:
2254                 if (hcd->speed != HCD_USB3) {
2255                         dev_dbg(dummy_dev(dum_hcd),
2256                                  "GetPortErrorCount req not "
2257                                  "supported for USB 2.0 roothub\n");
2258                         goto error;
2259                 }
2260                 /* We'll always return 0 since this is a dummy hub */
2261                 *(__le32 *) buf = cpu_to_le32(0);
2262                 break;
2263         case SetHubDepth:
2264                 if (hcd->speed != HCD_USB3) {
2265                         dev_dbg(dummy_dev(dum_hcd),
2266                                  "SetHubDepth req not supported for "
2267                                  "USB 2.0 roothub\n");
2268                         goto error;
2269                 }
2270                 break;
2271         default:
2272                 dev_dbg(dummy_dev(dum_hcd),
2273                         "hub control req%04x v%04x i%04x l%d\n",
2274                         typeReq, wValue, wIndex, wLength);
2275 error:
2276                 /* "protocol stall" on error */
2277                 retval = -EPIPE;
2278         }
2279         spin_unlock_irqrestore(&dum_hcd->dum->lock, flags);
2280
2281         if ((dum_hcd->port_status & PORT_C_MASK) != 0)
2282                 usb_hcd_poll_rh_status(hcd);
2283         return retval;
2284 }
2285
2286 static int dummy_bus_suspend(struct usb_hcd *hcd)
2287 {
2288         struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd);
2289
2290         dev_dbg(&hcd->self.root_hub->dev, "%s\n", __func__);
2291
2292         spin_lock_irq(&dum_hcd->dum->lock);
2293         dum_hcd->rh_state = DUMMY_RH_SUSPENDED;
2294         set_link_state(dum_hcd);
2295         hcd->state = HC_STATE_SUSPENDED;
2296         spin_unlock_irq(&dum_hcd->dum->lock);
2297         return 0;
2298 }
2299
2300 static int dummy_bus_resume(struct usb_hcd *hcd)
2301 {
2302         struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd);
2303         int rc = 0;
2304
2305         dev_dbg(&hcd->self.root_hub->dev, "%s\n", __func__);
2306
2307         spin_lock_irq(&dum_hcd->dum->lock);
2308         if (!HCD_HW_ACCESSIBLE(hcd)) {
2309                 rc = -ESHUTDOWN;
2310         } else {
2311                 dum_hcd->rh_state = DUMMY_RH_RUNNING;
2312                 set_link_state(dum_hcd);
2313                 if (!list_empty(&dum_hcd->urbp_list))
2314                         mod_timer(&dum_hcd->timer, jiffies);
2315                 hcd->state = HC_STATE_RUNNING;
2316         }
2317         spin_unlock_irq(&dum_hcd->dum->lock);
2318         return rc;
2319 }
2320
2321 /*-------------------------------------------------------------------------*/
2322
2323 static inline ssize_t show_urb(char *buf, size_t size, struct urb *urb)
2324 {
2325         int ep = usb_pipeendpoint(urb->pipe);
2326
2327         return snprintf(buf, size,
2328                 "urb/%p %s ep%d%s%s len %d/%d\n",
2329                 urb,
2330                 ({ char *s;
2331                 switch (urb->dev->speed) {
2332                 case USB_SPEED_LOW:
2333                         s = "ls";
2334                         break;
2335                 case USB_SPEED_FULL:
2336                         s = "fs";
2337                         break;
2338                 case USB_SPEED_HIGH:
2339                         s = "hs";
2340                         break;
2341                 case USB_SPEED_SUPER:
2342                         s = "ss";
2343                         break;
2344                 default:
2345                         s = "?";
2346                         break;
2347                  } s; }),
2348                 ep, ep ? (usb_pipein(urb->pipe) ? "in" : "out") : "",
2349                 ({ char *s; \
2350                 switch (usb_pipetype(urb->pipe)) { \
2351                 case PIPE_CONTROL: \
2352                         s = ""; \
2353                         break; \
2354                 case PIPE_BULK: \
2355                         s = "-bulk"; \
2356                         break; \
2357                 case PIPE_INTERRUPT: \
2358                         s = "-int"; \
2359                         break; \
2360                 default: \
2361                         s = "-iso"; \
2362                         break; \
2363                 } s; }),
2364                 urb->actual_length, urb->transfer_buffer_length);
2365 }
2366
2367 static ssize_t urbs_show(struct device *dev, struct device_attribute *attr,
2368                 char *buf)
2369 {
2370         struct usb_hcd          *hcd = dev_get_drvdata(dev);
2371         struct dummy_hcd        *dum_hcd = hcd_to_dummy_hcd(hcd);
2372         struct urbp             *urbp;
2373         size_t                  size = 0;
2374         unsigned long           flags;
2375
2376         spin_lock_irqsave(&dum_hcd->dum->lock, flags);
2377         list_for_each_entry(urbp, &dum_hcd->urbp_list, urbp_list) {
2378                 size_t          temp;
2379
2380                 temp = show_urb(buf, PAGE_SIZE - size, urbp->urb);
2381                 buf += temp;
2382                 size += temp;
2383         }
2384         spin_unlock_irqrestore(&dum_hcd->dum->lock, flags);
2385
2386         return size;
2387 }
2388 static DEVICE_ATTR_RO(urbs);
2389
2390 static int dummy_start_ss(struct dummy_hcd *dum_hcd)
2391 {
2392         init_timer(&dum_hcd->timer);
2393         dum_hcd->timer.function = dummy_timer;
2394         dum_hcd->timer.data = (unsigned long)dum_hcd;
2395         dum_hcd->rh_state = DUMMY_RH_RUNNING;
2396         dum_hcd->stream_en_ep = 0;
2397         INIT_LIST_HEAD(&dum_hcd->urbp_list);
2398         dummy_hcd_to_hcd(dum_hcd)->power_budget = POWER_BUDGET;
2399         dummy_hcd_to_hcd(dum_hcd)->state = HC_STATE_RUNNING;
2400         dummy_hcd_to_hcd(dum_hcd)->uses_new_polling = 1;
2401 #ifdef CONFIG_USB_OTG
2402         dummy_hcd_to_hcd(dum_hcd)->self.otg_port = 1;
2403 #endif
2404         return 0;
2405
2406         /* FIXME 'urbs' should be a per-device thing, maybe in usbcore */
2407         return device_create_file(dummy_dev(dum_hcd), &dev_attr_urbs);
2408 }
2409
2410 static int dummy_start(struct usb_hcd *hcd)
2411 {
2412         struct dummy_hcd        *dum_hcd = hcd_to_dummy_hcd(hcd);
2413
2414         /*
2415          * MASTER side init ... we emulate a root hub that'll only ever
2416          * talk to one device (the slave side).  Also appears in sysfs,
2417          * just like more familiar pci-based HCDs.
2418          */
2419         if (!usb_hcd_is_primary_hcd(hcd))
2420                 return dummy_start_ss(dum_hcd);
2421
2422         spin_lock_init(&dum_hcd->dum->lock);
2423         init_timer(&dum_hcd->timer);
2424         dum_hcd->timer.function = dummy_timer;
2425         dum_hcd->timer.data = (unsigned long)dum_hcd;
2426         dum_hcd->rh_state = DUMMY_RH_RUNNING;
2427
2428         INIT_LIST_HEAD(&dum_hcd->urbp_list);
2429
2430         hcd->power_budget = POWER_BUDGET;
2431         hcd->state = HC_STATE_RUNNING;
2432         hcd->uses_new_polling = 1;
2433
2434 #ifdef CONFIG_USB_OTG
2435         hcd->self.otg_port = 1;
2436 #endif
2437
2438         /* FIXME 'urbs' should be a per-device thing, maybe in usbcore */
2439         return device_create_file(dummy_dev(dum_hcd), &dev_attr_urbs);
2440 }
2441
2442 static void dummy_stop(struct usb_hcd *hcd)
2443 {
2444         device_remove_file(dummy_dev(hcd_to_dummy_hcd(hcd)), &dev_attr_urbs);
2445         dev_info(dummy_dev(hcd_to_dummy_hcd(hcd)), "stopped\n");
2446 }
2447
2448 /*-------------------------------------------------------------------------*/
2449
2450 static int dummy_h_get_frame(struct usb_hcd *hcd)
2451 {
2452         return dummy_g_get_frame(NULL);
2453 }
2454
2455 static int dummy_setup(struct usb_hcd *hcd)
2456 {
2457         struct dummy *dum;
2458
2459         dum = *((void **)dev_get_platdata(hcd->self.controller));
2460         hcd->self.sg_tablesize = ~0;
2461         if (usb_hcd_is_primary_hcd(hcd)) {
2462                 dum->hs_hcd = hcd_to_dummy_hcd(hcd);
2463                 dum->hs_hcd->dum = dum;
2464                 /*
2465                  * Mark the first roothub as being USB 2.0.
2466                  * The USB 3.0 roothub will be registered later by
2467                  * dummy_hcd_probe()
2468                  */
2469                 hcd->speed = HCD_USB2;
2470                 hcd->self.root_hub->speed = USB_SPEED_HIGH;
2471         } else {
2472                 dum->ss_hcd = hcd_to_dummy_hcd(hcd);
2473                 dum->ss_hcd->dum = dum;
2474                 hcd->speed = HCD_USB3;
2475                 hcd->self.root_hub->speed = USB_SPEED_SUPER;
2476         }
2477         return 0;
2478 }
2479
2480 /* Change a group of bulk endpoints to support multiple stream IDs */
2481 static int dummy_alloc_streams(struct usb_hcd *hcd, struct usb_device *udev,
2482         struct usb_host_endpoint **eps, unsigned int num_eps,
2483         unsigned int num_streams, gfp_t mem_flags)
2484 {
2485         struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd);
2486         unsigned long flags;
2487         int max_stream;
2488         int ret_streams = num_streams;
2489         unsigned int index;
2490         unsigned int i;
2491
2492         if (!num_eps)
2493                 return -EINVAL;
2494
2495         spin_lock_irqsave(&dum_hcd->dum->lock, flags);
2496         for (i = 0; i < num_eps; i++) {
2497                 index = dummy_get_ep_idx(&eps[i]->desc);
2498                 if ((1 << index) & dum_hcd->stream_en_ep) {
2499                         ret_streams = -EINVAL;
2500                         goto out;
2501                 }
2502                 max_stream = usb_ss_max_streams(&eps[i]->ss_ep_comp);
2503                 if (!max_stream) {
2504                         ret_streams = -EINVAL;
2505                         goto out;
2506                 }
2507                 if (max_stream < ret_streams) {
2508                         dev_dbg(dummy_dev(dum_hcd), "Ep 0x%x only supports %u "
2509                                         "stream IDs.\n",
2510                                         eps[i]->desc.bEndpointAddress,
2511                                         max_stream);
2512                         ret_streams = max_stream;
2513                 }
2514         }
2515
2516         for (i = 0; i < num_eps; i++) {
2517                 index = dummy_get_ep_idx(&eps[i]->desc);
2518                 dum_hcd->stream_en_ep |= 1 << index;
2519                 set_max_streams_for_pipe(dum_hcd,
2520                                 usb_endpoint_num(&eps[i]->desc), ret_streams);
2521         }
2522 out:
2523         spin_unlock_irqrestore(&dum_hcd->dum->lock, flags);
2524         return ret_streams;
2525 }
2526
2527 /* Reverts a group of bulk endpoints back to not using stream IDs. */
2528 static int dummy_free_streams(struct usb_hcd *hcd, struct usb_device *udev,
2529         struct usb_host_endpoint **eps, unsigned int num_eps,
2530         gfp_t mem_flags)
2531 {
2532         struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd);
2533         unsigned long flags;
2534         int ret;
2535         unsigned int index;
2536         unsigned int i;
2537
2538         spin_lock_irqsave(&dum_hcd->dum->lock, flags);
2539         for (i = 0; i < num_eps; i++) {
2540                 index = dummy_get_ep_idx(&eps[i]->desc);
2541                 if (!((1 << index) & dum_hcd->stream_en_ep)) {
2542                         ret = -EINVAL;
2543                         goto out;
2544                 }
2545         }
2546
2547         for (i = 0; i < num_eps; i++) {
2548                 index = dummy_get_ep_idx(&eps[i]->desc);
2549                 dum_hcd->stream_en_ep &= ~(1 << index);
2550                 set_max_streams_for_pipe(dum_hcd,
2551                                 usb_endpoint_num(&eps[i]->desc), 0);
2552         }
2553         ret = 0;
2554 out:
2555         spin_unlock_irqrestore(&dum_hcd->dum->lock, flags);
2556         return ret;
2557 }
2558
2559 static struct hc_driver dummy_hcd = {
2560         .description =          (char *) driver_name,
2561         .product_desc =         "Dummy host controller",
2562         .hcd_priv_size =        sizeof(struct dummy_hcd),
2563
2564         .flags =                HCD_USB3 | HCD_SHARED,
2565
2566         .reset =                dummy_setup,
2567         .start =                dummy_start,
2568         .stop =                 dummy_stop,
2569
2570         .urb_enqueue =          dummy_urb_enqueue,
2571         .urb_dequeue =          dummy_urb_dequeue,
2572
2573         .get_frame_number =     dummy_h_get_frame,
2574
2575         .hub_status_data =      dummy_hub_status,
2576         .hub_control =          dummy_hub_control,
2577         .bus_suspend =          dummy_bus_suspend,
2578         .bus_resume =           dummy_bus_resume,
2579
2580         .alloc_streams =        dummy_alloc_streams,
2581         .free_streams =         dummy_free_streams,
2582 };
2583
2584 static int dummy_hcd_probe(struct platform_device *pdev)
2585 {
2586         struct dummy            *dum;
2587         struct usb_hcd          *hs_hcd;
2588         struct usb_hcd          *ss_hcd;
2589         int                     retval;
2590
2591         dev_info(&pdev->dev, "%s, driver " DRIVER_VERSION "\n", driver_desc);
2592         dum = *((void **)dev_get_platdata(&pdev->dev));
2593
2594         if (!mod_data.is_super_speed)
2595                 dummy_hcd.flags = HCD_USB2;
2596         hs_hcd = usb_create_hcd(&dummy_hcd, &pdev->dev, dev_name(&pdev->dev));
2597         if (!hs_hcd)
2598                 return -ENOMEM;
2599         hs_hcd->has_tt = 1;
2600
2601         retval = usb_add_hcd(hs_hcd, 0, 0);
2602         if (retval)
2603                 goto put_usb2_hcd;
2604
2605         if (mod_data.is_super_speed) {
2606                 ss_hcd = usb_create_shared_hcd(&dummy_hcd, &pdev->dev,
2607                                         dev_name(&pdev->dev), hs_hcd);
2608                 if (!ss_hcd) {
2609                         retval = -ENOMEM;
2610                         goto dealloc_usb2_hcd;
2611                 }
2612
2613                 retval = usb_add_hcd(ss_hcd, 0, 0);
2614                 if (retval)
2615                         goto put_usb3_hcd;
2616         }
2617         return 0;
2618
2619 put_usb3_hcd:
2620         usb_put_hcd(ss_hcd);
2621 dealloc_usb2_hcd:
2622         usb_remove_hcd(hs_hcd);
2623 put_usb2_hcd:
2624         usb_put_hcd(hs_hcd);
2625         dum->hs_hcd = dum->ss_hcd = NULL;
2626         return retval;
2627 }
2628
2629 static int dummy_hcd_remove(struct platform_device *pdev)
2630 {
2631         struct dummy            *dum;
2632
2633         dum = hcd_to_dummy_hcd(platform_get_drvdata(pdev))->dum;
2634
2635         if (dum->ss_hcd) {
2636                 usb_remove_hcd(dummy_hcd_to_hcd(dum->ss_hcd));
2637                 usb_put_hcd(dummy_hcd_to_hcd(dum->ss_hcd));
2638         }
2639
2640         usb_remove_hcd(dummy_hcd_to_hcd(dum->hs_hcd));
2641         usb_put_hcd(dummy_hcd_to_hcd(dum->hs_hcd));
2642
2643         dum->hs_hcd = NULL;
2644         dum->ss_hcd = NULL;
2645
2646         return 0;
2647 }
2648
2649 static int dummy_hcd_suspend(struct platform_device *pdev, pm_message_t state)
2650 {
2651         struct usb_hcd          *hcd;
2652         struct dummy_hcd        *dum_hcd;
2653         int                     rc = 0;
2654
2655         dev_dbg(&pdev->dev, "%s\n", __func__);
2656
2657         hcd = platform_get_drvdata(pdev);
2658         dum_hcd = hcd_to_dummy_hcd(hcd);
2659         if (dum_hcd->rh_state == DUMMY_RH_RUNNING) {
2660                 dev_warn(&pdev->dev, "Root hub isn't suspended!\n");
2661                 rc = -EBUSY;
2662         } else
2663                 clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
2664         return rc;
2665 }
2666
2667 static int dummy_hcd_resume(struct platform_device *pdev)
2668 {
2669         struct usb_hcd          *hcd;
2670
2671         dev_dbg(&pdev->dev, "%s\n", __func__);
2672
2673         hcd = platform_get_drvdata(pdev);
2674         set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
2675         usb_hcd_poll_rh_status(hcd);
2676         return 0;
2677 }
2678
2679 static struct platform_driver dummy_hcd_driver = {
2680         .probe          = dummy_hcd_probe,
2681         .remove         = dummy_hcd_remove,
2682         .suspend        = dummy_hcd_suspend,
2683         .resume         = dummy_hcd_resume,
2684         .driver         = {
2685                 .name   = (char *) driver_name,
2686         },
2687 };
2688
2689 /*-------------------------------------------------------------------------*/
2690 #define MAX_NUM_UDC     2
2691 static struct platform_device *the_udc_pdev[MAX_NUM_UDC];
2692 static struct platform_device *the_hcd_pdev[MAX_NUM_UDC];
2693
2694 static int __init init(void)
2695 {
2696         int     retval = -ENOMEM;
2697         int     i;
2698         struct  dummy *dum[MAX_NUM_UDC];
2699
2700         if (usb_disabled())
2701                 return -ENODEV;
2702
2703         if (!mod_data.is_high_speed && mod_data.is_super_speed)
2704                 return -EINVAL;
2705
2706         if (mod_data.num < 1 || mod_data.num > MAX_NUM_UDC) {
2707                 pr_err("Number of emulated UDC must be in range of 1...%d\n",
2708                                 MAX_NUM_UDC);
2709                 return -EINVAL;
2710         }
2711
2712         for (i = 0; i < mod_data.num; i++) {
2713                 the_hcd_pdev[i] = platform_device_alloc(driver_name, i);
2714                 if (!the_hcd_pdev[i]) {
2715                         i--;
2716                         while (i >= 0)
2717                                 platform_device_put(the_hcd_pdev[i--]);
2718                         return retval;
2719                 }
2720         }
2721         for (i = 0; i < mod_data.num; i++) {
2722                 the_udc_pdev[i] = platform_device_alloc(gadget_name, i);
2723                 if (!the_udc_pdev[i]) {
2724                         i--;
2725                         while (i >= 0)
2726                                 platform_device_put(the_udc_pdev[i--]);
2727                         goto err_alloc_udc;
2728                 }
2729         }
2730         for (i = 0; i < mod_data.num; i++) {
2731                 dum[i] = kzalloc(sizeof(struct dummy), GFP_KERNEL);
2732                 if (!dum[i]) {
2733                         retval = -ENOMEM;
2734                         goto err_add_pdata;
2735                 }
2736                 retval = platform_device_add_data(the_hcd_pdev[i], &dum[i],
2737                                 sizeof(void *));
2738                 if (retval)
2739                         goto err_add_pdata;
2740                 retval = platform_device_add_data(the_udc_pdev[i], &dum[i],
2741                                 sizeof(void *));
2742                 if (retval)
2743                         goto err_add_pdata;
2744         }
2745
2746         retval = platform_driver_register(&dummy_hcd_driver);
2747         if (retval < 0)
2748                 goto err_add_pdata;
2749         retval = platform_driver_register(&dummy_udc_driver);
2750         if (retval < 0)
2751                 goto err_register_udc_driver;
2752
2753         for (i = 0; i < mod_data.num; i++) {
2754                 retval = platform_device_add(the_hcd_pdev[i]);
2755                 if (retval < 0) {
2756                         i--;
2757                         while (i >= 0)
2758                                 platform_device_del(the_hcd_pdev[i--]);
2759                         goto err_add_hcd;
2760                 }
2761         }
2762         for (i = 0; i < mod_data.num; i++) {
2763                 if (!dum[i]->hs_hcd ||
2764                                 (!dum[i]->ss_hcd && mod_data.is_super_speed)) {
2765                         /*
2766                          * The hcd was added successfully but its probe
2767                          * function failed for some reason.
2768                          */
2769                         retval = -EINVAL;
2770                         goto err_add_udc;
2771                 }
2772         }
2773
2774         for (i = 0; i < mod_data.num; i++) {
2775                 retval = platform_device_add(the_udc_pdev[i]);
2776                 if (retval < 0) {
2777                         i--;
2778                         while (i >= 0)
2779                                 platform_device_del(the_udc_pdev[i]);
2780                         goto err_add_udc;
2781                 }
2782         }
2783
2784         for (i = 0; i < mod_data.num; i++) {
2785                 if (!platform_get_drvdata(the_udc_pdev[i])) {
2786                         /*
2787                          * The udc was added successfully but its probe
2788                          * function failed for some reason.
2789                          */
2790                         retval = -EINVAL;
2791                         goto err_probe_udc;
2792                 }
2793         }
2794         return retval;
2795
2796 err_probe_udc:
2797         for (i = 0; i < mod_data.num; i++)
2798                 platform_device_del(the_udc_pdev[i]);
2799 err_add_udc:
2800         for (i = 0; i < mod_data.num; i++)
2801                 platform_device_del(the_hcd_pdev[i]);
2802 err_add_hcd:
2803         platform_driver_unregister(&dummy_udc_driver);
2804 err_register_udc_driver:
2805         platform_driver_unregister(&dummy_hcd_driver);
2806 err_add_pdata:
2807         for (i = 0; i < mod_data.num; i++)
2808                 kfree(dum[i]);
2809         for (i = 0; i < mod_data.num; i++)
2810                 platform_device_put(the_udc_pdev[i]);
2811 err_alloc_udc:
2812         for (i = 0; i < mod_data.num; i++)
2813                 platform_device_put(the_hcd_pdev[i]);
2814         return retval;
2815 }
2816 module_init(init);
2817
2818 static void __exit cleanup(void)
2819 {
2820         int i;
2821
2822         for (i = 0; i < mod_data.num; i++) {
2823                 struct dummy *dum;
2824
2825                 dum = *((void **)dev_get_platdata(&the_udc_pdev[i]->dev));
2826
2827                 platform_device_unregister(the_udc_pdev[i]);
2828                 platform_device_unregister(the_hcd_pdev[i]);
2829                 kfree(dum);
2830         }
2831         platform_driver_unregister(&dummy_udc_driver);
2832         platform_driver_unregister(&dummy_hcd_driver);
2833 }
2834 module_exit(cleanup);