drivers/usb/gadget/udc/dummy_hcd.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * dummy_hcd.c -- Dummy/Loopback USB host and device emulator driver.
   4  *
   5  * Maintainer: Alan Stern <stern@rowland.harvard.edu>
   6  *
   7  * Copyright (C) 2003 David Brownell
   8  * Copyright (C) 2003-2005 Alan Stern
   9  */
  10
  11
  12 /*
  13  * This exposes a device side "USB gadget" API, driven by requests to a
  14  * Linux-USB host controller driver.  USB traffic is simulated; there's
  15  * no need for USB hardware.  Use this with two other drivers:
  16  *
  17  *  - Gadget driver, responding to requests (device);
  18  *  - Host-side device driver, as already familiar in Linux.
  19  *
  20  * Having this all in one kernel can help some stages of development,
  21  * bypassing some hardware (and driver) issues.  UML could help too.
  22  *
  23  * Note: The emulation does not include isochronous transfers!
  24  */
  25
  26 #include <linux/module.h>
  27 #include <linux/kernel.h>
  28 #include <linux/delay.h>
  29 #include <linux/ioport.h>
  30 #include <linux/slab.h>
  31 #include <linux/errno.h>
  32 #include <linux/init.h>
  33 #include <linux/timer.h>
  34 #include <linux/list.h>
  35 #include <linux/interrupt.h>
  36 #include <linux/platform_device.h>
  37 #include <linux/usb.h>
  38 #include <linux/usb/gadget.h>
  39 #include <linux/usb/hcd.h>
  40 #include <linux/scatterlist.h>
  41
  42 #include <asm/byteorder.h>
  43 #include <linux/io.h>
  44 #include <asm/irq.h>
  45 #include <asm/unaligned.h>
  46
  47 #define DRIVER_DESC     "USB Host+Gadget Emulator"
  48 #define DRIVER_VERSION  "02 May 2005"
  49
  50 #define POWER_BUDGET    500     /* in mA; use 8 for low-power port testing */
  51 #define POWER_BUDGET_3  900     /* in mA */
  52
  53 static const char       driver_name[] = "dummy_hcd";
  54 static const char       driver_desc[] = "USB Host+Gadget Emulator";
  55
  56 static const char       gadget_name[] = "dummy_udc";
  57
  58 MODULE_DESCRIPTION(DRIVER_DESC);
  59 MODULE_AUTHOR("David Brownell");
  60 MODULE_LICENSE("GPL");
  61
  62 struct dummy_hcd_module_parameters {
  63         bool is_super_speed;
  64         bool is_high_speed;
  65         unsigned int num;
  66 };
  67
  68 static struct dummy_hcd_module_parameters mod_data = {
  69         .is_super_speed = false,
  70         .is_high_speed = true,
  71         .num = 1,
  72 };
  73 module_param_named(is_super_speed, mod_data.is_super_speed, bool, S_IRUGO);
  74 MODULE_PARM_DESC(is_super_speed, "true to simulate SuperSpeed connection");
  75 module_param_named(is_high_speed, mod_data.is_high_speed, bool, S_IRUGO);
  76 MODULE_PARM_DESC(is_high_speed, "true to simulate HighSpeed connection");
  77 module_param_named(num, mod_data.num, uint, S_IRUGO);
  78 MODULE_PARM_DESC(num, "number of emulated controllers");
  79 /*-------------------------------------------------------------------------*/
  80
  81 /* gadget side driver data structres */
  82 struct dummy_ep {
  83         struct list_head                queue;
  84         unsigned long                   last_io;        /* jiffies timestamp */
  85         struct usb_gadget               *gadget;
  86         const struct usb_endpoint_descriptor *desc;
  87         struct usb_ep                   ep;
  88         unsigned                        halted:1;
  89         unsigned                        wedged:1;
  90         unsigned                        already_seen:1;
  91         unsigned                        setup_stage:1;
  92         unsigned                        stream_en:1;
  93 };
  94
  95 struct dummy_request {
  96         struct list_head                queue;          /* ep's requests */
  97         struct usb_request              req;
  98 };
  99
 100 static inline struct dummy_ep *usb_ep_to_dummy_ep(struct usb_ep *_ep)
 101 {
 102         return container_of(_ep, struct dummy_ep, ep);
 103 }
 104
 105 static inline struct dummy_request *usb_request_to_dummy_request
 106                 (struct usb_request *_req)
 107 {
 108         return container_of(_req, struct dummy_request, req);
 109 }
 110
 111 /*-------------------------------------------------------------------------*/
 112
 113 /*
 114  * Every device has ep0 for control requests, plus up to 30 more endpoints,
 115  * in one of two types:
 116  *
 117  *   - Configurable:  direction (in/out), type (bulk, iso, etc), and endpoint
 118  *     number can be changed.  Names like "ep-a" are used for this type.
 119  *
 120  *   - Fixed Function:  in other cases.  some characteristics may be mutable;
 121  *     that'd be hardware-specific.  Names like "ep12out-bulk" are used.
 122  *
 123  * Gadget drivers are responsible for not setting up conflicting endpoint
 124  * configurations, illegal or unsupported packet lengths, and so on.
 125  */
 126
 127 static const char ep0name[] = "ep0";
 128
 129 static const struct {
 130         const char *name;
 131         const struct usb_ep_caps caps;
 132 } ep_info[] = {
 133 #define EP_INFO(_name, _caps) \
 134         { \
 135                 .name = _name, \
 136                 .caps = _caps, \
 137         }
 138
 139 /* we don't provide isochronous endpoints since we don't support them */
 140 #define TYPE_BULK_OR_INT        (USB_EP_CAPS_TYPE_BULK | USB_EP_CAPS_TYPE_INT)
 141
 142         /* everyone has ep0 */
 143         EP_INFO(ep0name,
 144                 USB_EP_CAPS(USB_EP_CAPS_TYPE_CONTROL, USB_EP_CAPS_DIR_ALL)),
 145         /* act like a pxa250: fifteen fixed function endpoints */
 146         EP_INFO("ep1in-bulk",
 147                 USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, USB_EP_CAPS_DIR_IN)),
 148         EP_INFO("ep2out-bulk",
 149                 USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, USB_EP_CAPS_DIR_OUT)),
 150 /*
 151         EP_INFO("ep3in-iso",
 152                 USB_EP_CAPS(USB_EP_CAPS_TYPE_ISO, USB_EP_CAPS_DIR_IN)),
 153         EP_INFO("ep4out-iso",
 154                 USB_EP_CAPS(USB_EP_CAPS_TYPE_ISO, USB_EP_CAPS_DIR_OUT)),
 155 */
 156         EP_INFO("ep5in-int",
 157                 USB_EP_CAPS(USB_EP_CAPS_TYPE_INT, USB_EP_CAPS_DIR_IN)),
 158         EP_INFO("ep6in-bulk",
 159                 USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, USB_EP_CAPS_DIR_IN)),
 160         EP_INFO("ep7out-bulk",
 161                 USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, USB_EP_CAPS_DIR_OUT)),
 162 /*
 163         EP_INFO("ep8in-iso",
 164                 USB_EP_CAPS(USB_EP_CAPS_TYPE_ISO, USB_EP_CAPS_DIR_IN)),
 165         EP_INFO("ep9out-iso",
 166                 USB_EP_CAPS(USB_EP_CAPS_TYPE_ISO, USB_EP_CAPS_DIR_OUT)),
 167 */
 168         EP_INFO("ep10in-int",
 169                 USB_EP_CAPS(USB_EP_CAPS_TYPE_INT, USB_EP_CAPS_DIR_IN)),
 170         EP_INFO("ep11in-bulk",
 171                 USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, USB_EP_CAPS_DIR_IN)),
 172         EP_INFO("ep12out-bulk",
 173                 USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, USB_EP_CAPS_DIR_OUT)),
 174 /*
 175         EP_INFO("ep13in-iso",
 176                 USB_EP_CAPS(USB_EP_CAPS_TYPE_ISO, USB_EP_CAPS_DIR_IN)),
 177         EP_INFO("ep14out-iso",
 178                 USB_EP_CAPS(USB_EP_CAPS_TYPE_ISO, USB_EP_CAPS_DIR_OUT)),
 179 */
 180         EP_INFO("ep15in-int",
 181                 USB_EP_CAPS(USB_EP_CAPS_TYPE_INT, USB_EP_CAPS_DIR_IN)),
 182
 183         /* or like sa1100: two fixed function endpoints */
 184         EP_INFO("ep1out-bulk",
 185                 USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, USB_EP_CAPS_DIR_OUT)),
 186         EP_INFO("ep2in-bulk",
 187                 USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, USB_EP_CAPS_DIR_IN)),
 188
 189         /* and now some generic EPs so we have enough in multi config */
 190         EP_INFO("ep-aout",
 191                 USB_EP_CAPS(TYPE_BULK_OR_INT, USB_EP_CAPS_DIR_OUT)),
 192         EP_INFO("ep-bin",
 193                 USB_EP_CAPS(TYPE_BULK_OR_INT, USB_EP_CAPS_DIR_IN)),
 194         EP_INFO("ep-cout",
 195                 USB_EP_CAPS(TYPE_BULK_OR_INT, USB_EP_CAPS_DIR_OUT)),
 196         EP_INFO("ep-dout",
 197                 USB_EP_CAPS(TYPE_BULK_OR_INT, USB_EP_CAPS_DIR_OUT)),
 198         EP_INFO("ep-ein",
 199                 USB_EP_CAPS(TYPE_BULK_OR_INT, USB_EP_CAPS_DIR_IN)),
 200         EP_INFO("ep-fout",
 201                 USB_EP_CAPS(TYPE_BULK_OR_INT, USB_EP_CAPS_DIR_OUT)),
 202         EP_INFO("ep-gin",
 203                 USB_EP_CAPS(TYPE_BULK_OR_INT, USB_EP_CAPS_DIR_IN)),
 204         EP_INFO("ep-hout",
 205                 USB_EP_CAPS(TYPE_BULK_OR_INT, USB_EP_CAPS_DIR_OUT)),
 206         EP_INFO("ep-iout",
 207                 USB_EP_CAPS(TYPE_BULK_OR_INT, USB_EP_CAPS_DIR_OUT)),
 208         EP_INFO("ep-jin",
 209                 USB_EP_CAPS(TYPE_BULK_OR_INT, USB_EP_CAPS_DIR_IN)),
 210         EP_INFO("ep-kout",
 211                 USB_EP_CAPS(TYPE_BULK_OR_INT, USB_EP_CAPS_DIR_OUT)),
 212         EP_INFO("ep-lin",
 213                 USB_EP_CAPS(TYPE_BULK_OR_INT, USB_EP_CAPS_DIR_IN)),
 214         EP_INFO("ep-mout",
 215                 USB_EP_CAPS(TYPE_BULK_OR_INT, USB_EP_CAPS_DIR_OUT)),
 216
 217 #undef EP_INFO
 218 };
 219
 220 #define DUMMY_ENDPOINTS ARRAY_SIZE(ep_info)
 221
 222 /*-------------------------------------------------------------------------*/
 223
 224 #define FIFO_SIZE               64
 225
 226 struct urbp {
 227         struct urb              *urb;
 228         struct list_head        urbp_list;
 229         struct sg_mapping_iter  miter;
 230         u32                     miter_started;
 231 };
 232
 233
 234 enum dummy_rh_state {
 235         DUMMY_RH_RESET,
 236         DUMMY_RH_SUSPENDED,
 237         DUMMY_RH_RUNNING
 238 };
 239
 240 struct dummy_hcd {
 241         struct dummy                    *dum;
 242         enum dummy_rh_state             rh_state;
 243         struct timer_list               timer;
 244         u32                             port_status;
 245         u32                             old_status;
 246         unsigned long                   re_timeout;
 247
 248         struct usb_device               *udev;
 249         struct list_head                urbp_list;
 250         struct urbp                     *next_frame_urbp;
 251
 252         u32                             stream_en_ep;
 253         u8                              num_stream[30 / 2];
 254
 255         unsigned                        active:1;
 256         unsigned                        old_active:1;
 257         unsigned                        resuming:1;
 258 };
 259
 260 struct dummy {
 261         spinlock_t                      lock;
 262
 263         /*
 264          * DEVICE/GADGET side support
 265          */
 266         struct dummy_ep                 ep[DUMMY_ENDPOINTS];
 267         int                             address;
 268         int                             callback_usage;
 269         struct usb_gadget               gadget;
 270         struct usb_gadget_driver        *driver;
 271         struct dummy_request            fifo_req;
 272         u8                              fifo_buf[FIFO_SIZE];
 273         u16                             devstatus;
 274         unsigned                        ints_enabled:1;
 275         unsigned                        udc_suspended:1;
 276         unsigned                        pullup:1;
 277
 278         /*
 279          * HOST side support
 280          */
 281         struct dummy_hcd                *hs_hcd;
 282         struct dummy_hcd                *ss_hcd;
 283 };
 284
 285 static inline struct dummy_hcd *hcd_to_dummy_hcd(struct usb_hcd *hcd)
 286 {
 287         return (struct dummy_hcd *) (hcd->hcd_priv);
 288 }
 289
 290 static inline struct usb_hcd *dummy_hcd_to_hcd(struct dummy_hcd *dum)
 291 {
 292         return container_of((void *) dum, struct usb_hcd, hcd_priv);
 293 }
 294
 295 static inline struct device *dummy_dev(struct dummy_hcd *dum)
 296 {
 297         return dummy_hcd_to_hcd(dum)->self.controller;
 298 }
 299
 300 static inline struct device *udc_dev(struct dummy *dum)
 301 {
 302         return dum->gadget.dev.parent;
 303 }
 304
 305 static inline struct dummy *ep_to_dummy(struct dummy_ep *ep)
 306 {
 307         return container_of(ep->gadget, struct dummy, gadget);
 308 }
 309
 310 static inline struct dummy_hcd *gadget_to_dummy_hcd(struct usb_gadget *gadget)
 311 {
 312         struct dummy *dum = container_of(gadget, struct dummy, gadget);
 313         if (dum->gadget.speed == USB_SPEED_SUPER)
 314                 return dum->ss_hcd;
 315         else
 316                 return dum->hs_hcd;
 317 }
 318
 319 static inline struct dummy *gadget_dev_to_dummy(struct device *dev)
 320 {
 321         return container_of(dev, struct dummy, gadget.dev);
 322 }
 323
 324 /*-------------------------------------------------------------------------*/
 325
 326 /* DEVICE/GADGET SIDE UTILITY ROUTINES */
 327
 328 /* called with spinlock held */
 329 static void nuke(struct dummy *dum, struct dummy_ep *ep)
 330 {
 331         while (!list_empty(&ep->queue)) {
 332                 struct dummy_request    *req;
 333
 334                 req = list_entry(ep->queue.next, struct dummy_request, queue);
 335                 list_del_init(&req->queue);
 336                 req->req.status = -ESHUTDOWN;
 337
 338                 spin_unlock(&dum->lock);
 339                 usb_gadget_giveback_request(&ep->ep, &req->req);
 340                 spin_lock(&dum->lock);
 341         }
 342 }
 343
 344 /* caller must hold lock */
 345 static void stop_activity(struct dummy *dum)
 346 {
 347         int i;
 348
 349         /* prevent any more requests */
 350         dum->address = 0;
 351
 352         /* The timer is left running so that outstanding URBs can fail */
 353
 354         /* nuke any pending requests first, so driver i/o is quiesced */
 355         for (i = 0; i < DUMMY_ENDPOINTS; ++i)
 356                 nuke(dum, &dum->ep[i]);
 357
 358         /* driver now does any non-usb quiescing necessary */
 359 }
 360
 361 /**
 362  * set_link_state_by_speed() - Sets the current state of the link according to
 363  *      the hcd speed
 364  * @dum_hcd: pointer to the dummy_hcd structure to update the link state for
 365  *
 366  * This function updates the port_status according to the link state and the
 367  * speed of the hcd.
 368  */
 369 static void set_link_state_by_speed(struct dummy_hcd *dum_hcd)
 370 {
 371         struct dummy *dum = dum_hcd->dum;
 372
 373         if (dummy_hcd_to_hcd(dum_hcd)->speed == HCD_USB3) {
 374                 if ((dum_hcd->port_status & USB_SS_PORT_STAT_POWER) == 0) {
 375                         dum_hcd->port_status = 0;
 376                 } else if (!dum->pullup || dum->udc_suspended) {
 377                         /* UDC suspend must cause a disconnect */
 378                         dum_hcd->port_status &= ~(USB_PORT_STAT_CONNECTION |
 379                                                 USB_PORT_STAT_ENABLE);
 380                         if ((dum_hcd->old_status &
 381                              USB_PORT_STAT_CONNECTION) != 0)
 382                                 dum_hcd->port_status |=
 383                                         (USB_PORT_STAT_C_CONNECTION << 16);
 384                 } else {
 385                         /* device is connected and not suspended */
 386                         dum_hcd->port_status |= (USB_PORT_STAT_CONNECTION |
 387                                                  USB_PORT_STAT_SPEED_5GBPS) ;
 388                         if ((dum_hcd->old_status &
 389                              USB_PORT_STAT_CONNECTION) == 0)
 390                                 dum_hcd->port_status |=
 391                                         (USB_PORT_STAT_C_CONNECTION << 16);
 392                         if ((dum_hcd->port_status & USB_PORT_STAT_ENABLE) &&
 393                             (dum_hcd->port_status &
 394                              USB_PORT_STAT_LINK_STATE) == USB_SS_PORT_LS_U0 &&
 395                             dum_hcd->rh_state != DUMMY_RH_SUSPENDED)
 396                                 dum_hcd->active = 1;
 397                 }
 398         } else {
 399                 if ((dum_hcd->port_status & USB_PORT_STAT_POWER) == 0) {
 400                         dum_hcd->port_status = 0;
 401                 } else if (!dum->pullup || dum->udc_suspended) {
 402                         /* UDC suspend must cause a disconnect */
 403                         dum_hcd->port_status &= ~(USB_PORT_STAT_CONNECTION |
 404                                                 USB_PORT_STAT_ENABLE |
 405                                                 USB_PORT_STAT_LOW_SPEED |
 406                                                 USB_PORT_STAT_HIGH_SPEED |
 407                                                 USB_PORT_STAT_SUSPEND);
 408                         if ((dum_hcd->old_status &
 409                              USB_PORT_STAT_CONNECTION) != 0)
 410                                 dum_hcd->port_status |=
 411                                         (USB_PORT_STAT_C_CONNECTION << 16);
 412                 } else {
 413                         dum_hcd->port_status |= USB_PORT_STAT_CONNECTION;
 414                         if ((dum_hcd->old_status &
 415                              USB_PORT_STAT_CONNECTION) == 0)
 416                                 dum_hcd->port_status |=
 417                                         (USB_PORT_STAT_C_CONNECTION << 16);
 418                         if ((dum_hcd->port_status & USB_PORT_STAT_ENABLE) == 0)
 419                                 dum_hcd->port_status &= ~USB_PORT_STAT_SUSPEND;
 420                         else if ((dum_hcd->port_status &
 421                                   USB_PORT_STAT_SUSPEND) == 0 &&
 422                                         dum_hcd->rh_state != DUMMY_RH_SUSPENDED)
 423                                 dum_hcd->active = 1;
 424                 }
 425         }
 426 }
 427
 428 /* caller must hold lock */
 429 static void set_link_state(struct dummy_hcd *dum_hcd)
 430         __must_hold(&dum->lock)
 431 {
 432         struct dummy *dum = dum_hcd->dum;
 433         unsigned int power_bit;
 434
 435         dum_hcd->active = 0;
 436         if (dum->pullup)
 437                 if ((dummy_hcd_to_hcd(dum_hcd)->speed == HCD_USB3 &&
 438                      dum->gadget.speed != USB_SPEED_SUPER) ||
 439                     (dummy_hcd_to_hcd(dum_hcd)->speed != HCD_USB3 &&
 440                      dum->gadget.speed == USB_SPEED_SUPER))
 441                         return;
 442
 443         set_link_state_by_speed(dum_hcd);
 444         power_bit = (dummy_hcd_to_hcd(dum_hcd)->speed == HCD_USB3 ?
 445                         USB_SS_PORT_STAT_POWER : USB_PORT_STAT_POWER);
 446
 447         if ((dum_hcd->port_status & USB_PORT_STAT_ENABLE) == 0 ||
 448              dum_hcd->active)
 449                 dum_hcd->resuming = 0;
 450
 451         /* Currently !connected or in reset */
 452         if ((dum_hcd->port_status & power_bit) == 0 ||
 453                         (dum_hcd->port_status & USB_PORT_STAT_RESET) != 0) {
 454                 unsigned int disconnect = power_bit &
 455                                 dum_hcd->old_status & (~dum_hcd->port_status);
 456                 unsigned int reset = USB_PORT_STAT_RESET &
 457                                 (~dum_hcd->old_status) & dum_hcd->port_status;
 458
 459                 /* Report reset and disconnect events to the driver */
 460                 if (dum->ints_enabled && (disconnect || reset)) {
 461                         stop_activity(dum);
 462                         ++dum->callback_usage;
 463                         spin_unlock(&dum->lock);
 464                         if (reset)
 465                                 usb_gadget_udc_reset(&dum->gadget, dum->driver);
 466                         else
 467                                 dum->driver->disconnect(&dum->gadget);
 468                         spin_lock(&dum->lock);
 469                         --dum->callback_usage;
 470                 }
 471         } else if (dum_hcd->active != dum_hcd->old_active &&
 472                         dum->ints_enabled) {
 473                 ++dum->callback_usage;
 474                 spin_unlock(&dum->lock);
 475                 if (dum_hcd->old_active && dum->driver->suspend)
 476                         dum->driver->suspend(&dum->gadget);
 477                 else if (!dum_hcd->old_active &&  dum->driver->resume)
 478                         dum->driver->resume(&dum->gadget);
 479                 spin_lock(&dum->lock);
 480                 --dum->callback_usage;
 481         }
 482
 483         dum_hcd->old_status = dum_hcd->port_status;
 484         dum_hcd->old_active = dum_hcd->active;
 485 }
 486
 487 /*-------------------------------------------------------------------------*/
 488
 489 /* DEVICE/GADGET SIDE DRIVER
 490  *
 491  * This only tracks gadget state.  All the work is done when the host
 492  * side tries some (emulated) i/o operation.  Real device controller
 493  * drivers would do real i/o using dma, fifos, irqs, timers, etc.
 494  */
 495
 496 #define is_enabled(dum) \
 497         (dum->port_status & USB_PORT_STAT_ENABLE)
 498
 499 static int dummy_enable(struct usb_ep *_ep,
 500                 const struct usb_endpoint_descriptor *desc)
 501 {
 502         struct dummy            *dum;
 503         struct dummy_hcd        *dum_hcd;
 504         struct dummy_ep         *ep;
 505         unsigned                max;
 506         int                     retval;
 507
 508         ep = usb_ep_to_dummy_ep(_ep);
 509         if (!_ep || !desc || ep->desc || _ep->name == ep0name
 510                         || desc->bDescriptorType != USB_DT_ENDPOINT)
 511                 return -EINVAL;
 512         dum = ep_to_dummy(ep);
 513         if (!dum->driver)
 514                 return -ESHUTDOWN;
 515
 516         dum_hcd = gadget_to_dummy_hcd(&dum->gadget);
 517         if (!is_enabled(dum_hcd))
 518                 return -ESHUTDOWN;
 519
 520         /*
 521          * For HS/FS devices only bits 0..10 of the wMaxPacketSize represent the
 522          * maximum packet size.
 523          * For SS devices the wMaxPacketSize is limited by 1024.
 524          */
 525         max = usb_endpoint_maxp(desc);
 526
 527         /* drivers must not request bad settings, since lower levels
 528          * (hardware or its drivers) may not check.  some endpoints
 529          * can't do iso, many have maxpacket limitations, etc.
 530          *
 531          * since this "hardware" driver is here to help debugging, we
 532          * have some extra sanity checks.  (there could be more though,
 533          * especially for "ep9out" style fixed function ones.)
 534          */
 535         retval = -EINVAL;
 536         switch (usb_endpoint_type(desc)) {
 537         case USB_ENDPOINT_XFER_BULK:
 538                 if (strstr(ep->ep.name, "-iso")
 539                                 || strstr(ep->ep.name, "-int")) {
 540                         goto done;
 541                 }
 542                 switch (dum->gadget.speed) {
 543                 case USB_SPEED_SUPER:
 544                         if (max == 1024)
 545                                 break;
 546                         goto done;
 547                 case USB_SPEED_HIGH:
 548                         if (max == 512)
 549                                 break;
 550                         goto done;
 551                 case USB_SPEED_FULL:
 552                         if (max == 8 || max == 16 || max == 32 || max == 64)
 553                                 /* we'll fake any legal size */
 554                                 break;
 555                         /* save a return statement */
 556                         fallthrough;
 557                 default:
 558                         goto done;
 559                 }
 560                 break;
 561         case USB_ENDPOINT_XFER_INT:
 562                 if (strstr(ep->ep.name, "-iso")) /* bulk is ok */
 563                         goto done;
 564                 /* real hardware might not handle all packet sizes */
 565                 switch (dum->gadget.speed) {
 566                 case USB_SPEED_SUPER:
 567                 case USB_SPEED_HIGH:
 568                         if (max <= 1024)
 569                                 break;
 570                         /* save a return statement */
 571                         fallthrough;
 572                 case USB_SPEED_FULL:
 573                         if (max <= 64)
 574                                 break;
 575                         /* save a return statement */
 576                         fallthrough;
 577                 default:
 578                         if (max <= 8)
 579                                 break;
 580                         goto done;
 581                 }
 582                 break;
 583         case USB_ENDPOINT_XFER_ISOC:
 584                 if (strstr(ep->ep.name, "-bulk")
 585                                 || strstr(ep->ep.name, "-int"))
 586                         goto done;
 587                 /* real hardware might not handle all packet sizes */
 588                 switch (dum->gadget.speed) {
 589                 case USB_SPEED_SUPER:
 590                 case USB_SPEED_HIGH:
 591                         if (max <= 1024)
 592                                 break;
 593                         /* save a return statement */
 594                         fallthrough;
 595                 case USB_SPEED_FULL:
 596                         if (max <= 1023)
 597                                 break;
 598                         /* save a return statement */
 599                         fallthrough;
 600                 default:
 601                         goto done;
 602                 }
 603                 break;
 604         default:
 605                 /* few chips support control except on ep0 */
 606                 goto done;
 607         }
 608
 609         _ep->maxpacket = max;
 610         if (usb_ss_max_streams(_ep->comp_desc)) {
 611                 if (!usb_endpoint_xfer_bulk(desc)) {
 612                         dev_err(udc_dev(dum), "Can't enable stream support on "
 613                                         "non-bulk ep %s\n", _ep->name);
 614                         return -EINVAL;
 615                 }
 616                 ep->stream_en = 1;
 617         }
 618         ep->desc = desc;
 619
 620         dev_dbg(udc_dev(dum), "enabled %s (ep%d%s-%s) maxpacket %d stream %s\n",
 621                 _ep->name,
 622                 desc->bEndpointAddress & 0x0f,
 623                 (desc->bEndpointAddress & USB_DIR_IN) ? "in" : "out",
 624                 usb_ep_type_string(usb_endpoint_type(desc)),
 625                 max, ep->stream_en ? "enabled" : "disabled");
 626
 627         /* at this point real hardware should be NAKing transfers
 628          * to that endpoint, until a buffer is queued to it.
 629          */
 630         ep->halted = ep->wedged = 0;
 631         retval = 0;
 632 done:
 633         return retval;
 634 }
 635
 636 static int dummy_disable(struct usb_ep *_ep)
 637 {
 638         struct dummy_ep         *ep;
 639         struct dummy            *dum;
 640         unsigned long           flags;
 641
 642         ep = usb_ep_to_dummy_ep(_ep);
 643         if (!_ep || !ep->desc || _ep->name == ep0name)
 644                 return -EINVAL;
 645         dum = ep_to_dummy(ep);
 646
 647         spin_lock_irqsave(&dum->lock, flags);
 648         ep->desc = NULL;
 649         ep->stream_en = 0;
 650         nuke(dum, ep);
 651         spin_unlock_irqrestore(&dum->lock, flags);
 652
 653         dev_dbg(udc_dev(dum), "disabled %s\n", _ep->name);
 654         return 0;
 655 }
 656
 657 static struct usb_request *dummy_alloc_request(struct usb_ep *_ep,
 658                 gfp_t mem_flags)
 659 {
 660         struct dummy_request    *req;
 661
 662         if (!_ep)
 663                 return NULL;
 664
 665         req = kzalloc(sizeof(*req), mem_flags);
 666         if (!req)
 667                 return NULL;
 668         INIT_LIST_HEAD(&req->queue);
 669         return &req->req;
 670 }
 671
 672 static void dummy_free_request(struct usb_ep *_ep, struct usb_request *_req)
 673 {
 674         struct dummy_request    *req;
 675
 676         if (!_ep || !_req) {
 677                 WARN_ON(1);
 678                 return;
 679         }
 680
 681         req = usb_request_to_dummy_request(_req);
 682         WARN_ON(!list_empty(&req->queue));
 683         kfree(req);
 684 }
 685
 686 static void fifo_complete(struct usb_ep *ep, struct usb_request *req)
 687 {
 688 }
 689
 690 static int dummy_queue(struct usb_ep *_ep, struct usb_request *_req,
 691                 gfp_t mem_flags)
 692 {
 693         struct dummy_ep         *ep;
 694         struct dummy_request    *req;
 695         struct dummy            *dum;
 696         struct dummy_hcd        *dum_hcd;
 697         unsigned long           flags;
 698
 699         req = usb_request_to_dummy_request(_req);
 700         if (!_req || !list_empty(&req->queue) || !_req->complete)
 701                 return -EINVAL;
 702
 703         ep = usb_ep_to_dummy_ep(_ep);
 704         if (!_ep || (!ep->desc && _ep->name != ep0name))
 705                 return -EINVAL;
 706
 707         dum = ep_to_dummy(ep);
 708         dum_hcd = gadget_to_dummy_hcd(&dum->gadget);
 709         if (!dum->driver || !is_enabled(dum_hcd))
 710                 return -ESHUTDOWN;
 711
 712 #if 0
 713         dev_dbg(udc_dev(dum), "ep %p queue req %p to %s, len %d buf %p\n",
 714                         ep, _req, _ep->name, _req->length, _req->buf);
 715 #endif
 716         _req->status = -EINPROGRESS;
 717         _req->actual = 0;
 718         spin_lock_irqsave(&dum->lock, flags);
 719
 720         /* implement an emulated single-request FIFO */
 721         if (ep->desc && (ep->desc->bEndpointAddress & USB_DIR_IN) &&
 722                         list_empty(&dum->fifo_req.queue) &&
 723                         list_empty(&ep->queue) &&
 724                         _req->length <= FIFO_SIZE) {
 725                 req = &dum->fifo_req;
 726                 req->req = *_req;
 727                 req->req.buf = dum->fifo_buf;
 728                 memcpy(dum->fifo_buf, _req->buf, _req->length);
 729                 req->req.context = dum;
 730                 req->req.complete = fifo_complete;
 731
 732                 list_add_tail(&req->queue, &ep->queue);
 733                 spin_unlock(&dum->lock);
 734                 _req->actual = _req->length;
 735                 _req->status = 0;
 736                 usb_gadget_giveback_request(_ep, _req);
 737                 spin_lock(&dum->lock);
 738         }  else
 739                 list_add_tail(&req->queue, &ep->queue);
 740         spin_unlock_irqrestore(&dum->lock, flags);
 741
 742         /* real hardware would likely enable transfers here, in case
 743          * it'd been left NAKing.
 744          */
 745         return 0;
 746 }
 747
 748 static int dummy_dequeue(struct usb_ep *_ep, struct usb_request *_req)
 749 {
 750         struct dummy_ep         *ep;
 751         struct dummy            *dum;
 752         int                     retval = -EINVAL;
 753         unsigned long           flags;
 754         struct dummy_request    *req = NULL, *iter;
 755
 756         if (!_ep || !_req)
 757                 return retval;
 758         ep = usb_ep_to_dummy_ep(_ep);
 759         dum = ep_to_dummy(ep);
 760
 761         if (!dum->driver)
 762                 return -ESHUTDOWN;
 763
 764         local_irq_save(flags);
 765         spin_lock(&dum->lock);
 766         list_for_each_entry(iter, &ep->queue, queue) {
 767                 if (&iter->req != _req)
 768                         continue;
 769                 list_del_init(&iter->queue);
 770                 _req->status = -ECONNRESET;
 771                 req = iter;
 772                 retval = 0;
 773                 break;
 774         }
 775         spin_unlock(&dum->lock);
 776
 777         if (retval == 0) {
 778                 dev_dbg(udc_dev(dum),
 779                                 "dequeued req %p from %s, len %d buf %p\n",
 780                                 req, _ep->name, _req->length, _req->buf);
 781                 usb_gadget_giveback_request(_ep, _req);
 782         }
 783         local_irq_restore(flags);
 784         return retval;
 785 }
 786
 787 static int
 788 dummy_set_halt_and_wedge(struct usb_ep *_ep, int value, int wedged)
 789 {
 790         struct dummy_ep         *ep;
 791         struct dummy            *dum;
 792
 793         if (!_ep)
 794                 return -EINVAL;
 795         ep = usb_ep_to_dummy_ep(_ep);
 796         dum = ep_to_dummy(ep);
 797         if (!dum->driver)
 798                 return -ESHUTDOWN;
 799         if (!value)
 800                 ep->halted = ep->wedged = 0;
 801         else if (ep->desc && (ep->desc->bEndpointAddress & USB_DIR_IN) &&
 802                         !list_empty(&ep->queue))
 803                 return -EAGAIN;
 804         else {
 805                 ep->halted = 1;
 806                 if (wedged)
 807                         ep->wedged = 1;
 808         }
 809         /* FIXME clear emulated data toggle too */
 810         return 0;
 811 }
 812
 813 static int
 814 dummy_set_halt(struct usb_ep *_ep, int value)
 815 {
 816         return dummy_set_halt_and_wedge(_ep, value, 0);
 817 }
 818
 819 static int dummy_set_wedge(struct usb_ep *_ep)
 820 {
 821         if (!_ep || _ep->name == ep0name)
 822                 return -EINVAL;
 823         return dummy_set_halt_and_wedge(_ep, 1, 1);
 824 }
 825
 826 static const struct usb_ep_ops dummy_ep_ops = {
 827         .enable         = dummy_enable,
 828         .disable        = dummy_disable,
 829
 830         .alloc_request  = dummy_alloc_request,
 831         .free_request   = dummy_free_request,
 832
 833         .queue          = dummy_queue,
 834         .dequeue        = dummy_dequeue,
 835
 836         .set_halt       = dummy_set_halt,
 837         .set_wedge      = dummy_set_wedge,
 838 };
 839
 840 /*-------------------------------------------------------------------------*/
 841
 842 /* there are both host and device side versions of this call ... */
 843 static int dummy_g_get_frame(struct usb_gadget *_gadget)
 844 {
 845         struct timespec64 ts64;
 846
 847         ktime_get_ts64(&ts64);
 848         return ts64.tv_nsec / NSEC_PER_MSEC;
 849 }
 850
 851 static int dummy_wakeup(struct usb_gadget *_gadget)
 852 {
 853         struct dummy_hcd *dum_hcd;
 854
 855         dum_hcd = gadget_to_dummy_hcd(_gadget);
 856         if (!(dum_hcd->dum->devstatus & ((1 << USB_DEVICE_B_HNP_ENABLE)
 857                                 | (1 << USB_DEVICE_REMOTE_WAKEUP))))
 858                 return -EINVAL;
 859         if ((dum_hcd->port_status & USB_PORT_STAT_CONNECTION) == 0)
 860                 return -ENOLINK;
 861         if ((dum_hcd->port_status & USB_PORT_STAT_SUSPEND) == 0 &&
 862                          dum_hcd->rh_state != DUMMY_RH_SUSPENDED)
 863                 return -EIO;
 864
 865         /* FIXME: What if the root hub is suspended but the port isn't? */
 866
 867         /* hub notices our request, issues downstream resume, etc */
 868         dum_hcd->resuming = 1;
 869         dum_hcd->re_timeout = jiffies + msecs_to_jiffies(20);
 870         mod_timer(&dummy_hcd_to_hcd(dum_hcd)->rh_timer, dum_hcd->re_timeout);
 871         return 0;
 872 }
 873
 874 static int dummy_set_selfpowered(struct usb_gadget *_gadget, int value)
 875 {
 876         struct dummy    *dum;
 877
 878         _gadget->is_selfpowered = (value != 0);
 879         dum = gadget_to_dummy_hcd(_gadget)->dum;
 880         if (value)
 881                 dum->devstatus |= (1 << USB_DEVICE_SELF_POWERED);
 882         else
 883                 dum->devstatus &= ~(1 << USB_DEVICE_SELF_POWERED);
 884         return 0;
 885 }
 886
 887 static void dummy_udc_update_ep0(struct dummy *dum)
 888 {
 889         if (dum->gadget.speed == USB_SPEED_SUPER)
 890                 dum->ep[0].ep.maxpacket = 9;
 891         else
 892                 dum->ep[0].ep.maxpacket = 64;
 893 }
 894
 895 static int dummy_pullup(struct usb_gadget *_gadget, int value)
 896 {
 897         struct dummy_hcd *dum_hcd;
 898         struct dummy    *dum;
 899         unsigned long   flags;
 900
 901         dum = gadget_dev_to_dummy(&_gadget->dev);
 902         dum_hcd = gadget_to_dummy_hcd(_gadget);
 903
 904         spin_lock_irqsave(&dum->lock, flags);
 905         dum->pullup = (value != 0);
 906         set_link_state(dum_hcd);
 907         if (value == 0) {
 908                 /*
 909                  * Emulate synchronize_irq(): wait for callbacks to finish.
 910                  * This seems to be the best place to emulate the call to
 911                  * synchronize_irq() that's in usb_gadget_remove_driver().
 912                  * Doing it in dummy_udc_stop() would be too late since it
 913                  * is called after the unbind callback and unbind shouldn't
 914                  * be invoked until all the other callbacks are finished.
 915                  */
 916                 while (dum->callback_usage > 0) {
 917                         spin_unlock_irqrestore(&dum->lock, flags);
 918                         usleep_range(1000, 2000);
 919                         spin_lock_irqsave(&dum->lock, flags);
 920                 }
 921         }
 922         spin_unlock_irqrestore(&dum->lock, flags);
 923
 924         usb_hcd_poll_rh_status(dummy_hcd_to_hcd(dum_hcd));
 925         return 0;
 926 }
 927
 928 static void dummy_udc_set_speed(struct usb_gadget *_gadget,
 929                 enum usb_device_speed speed)
 930 {
 931         struct dummy    *dum;
 932
 933         dum = gadget_dev_to_dummy(&_gadget->dev);
 934         dum->gadget.speed = speed;
 935         dummy_udc_update_ep0(dum);
 936 }
 937
 938 static void dummy_udc_async_callbacks(struct usb_gadget *_gadget, bool enable)
 939 {
 940         struct dummy    *dum = gadget_dev_to_dummy(&_gadget->dev);
 941
 942         spin_lock_irq(&dum->lock);
 943         dum->ints_enabled = enable;
 944         spin_unlock_irq(&dum->lock);
 945 }
 946
 947 static int dummy_udc_start(struct usb_gadget *g,
 948                 struct usb_gadget_driver *driver);
 949 static int dummy_udc_stop(struct usb_gadget *g);
 950
 951 static const struct usb_gadget_ops dummy_ops = {
 952         .get_frame      = dummy_g_get_frame,
 953         .wakeup         = dummy_wakeup,
 954         .set_selfpowered = dummy_set_selfpowered,
 955         .pullup         = dummy_pullup,
 956         .udc_start      = dummy_udc_start,
 957         .udc_stop       = dummy_udc_stop,
 958         .udc_set_speed  = dummy_udc_set_speed,
 959         .udc_async_callbacks = dummy_udc_async_callbacks,
 960 };
 961
 962 /*-------------------------------------------------------------------------*/
 963
 964 /* "function" sysfs attribute */
 965 static ssize_t function_show(struct device *dev, struct device_attribute *attr,
 966                 char *buf)
 967 {
 968         struct dummy    *dum = gadget_dev_to_dummy(dev);
 969
 970         if (!dum->driver || !dum->driver->function)
 971                 return 0;
 972         return scnprintf(buf, PAGE_SIZE, "%s\n", dum->driver->function);
 973 }
 974 static DEVICE_ATTR_RO(function);
 975
 976 /*-------------------------------------------------------------------------*/
 977
 978 /*
 979  * Driver registration/unregistration.
 980  *
 981  * This is basically hardware-specific; there's usually only one real USB
 982  * device (not host) controller since that's how USB devices are intended
 983  * to work.  So most implementations of these api calls will rely on the
 984  * fact that only one driver will ever bind to the hardware.  But curious
 985  * hardware can be built with discrete components, so the gadget API doesn't
 986  * require that assumption.
 987  *
 988  * For this emulator, it might be convenient to create a usb device
 989  * for each driver that registers:  just add to a big root hub.
 990  */
 991
 992 static int dummy_udc_start(struct usb_gadget *g,
 993                 struct usb_gadget_driver *driver)
 994 {
 995         struct dummy_hcd        *dum_hcd = gadget_to_dummy_hcd(g);
 996         struct dummy            *dum = dum_hcd->dum;
 997
 998         switch (g->speed) {
 999         /* All the speeds we support */
1000         case USB_SPEED_LOW:
1001         case USB_SPEED_FULL:
1002         case USB_SPEED_HIGH:
1003         case USB_SPEED_SUPER:
1004                 break;
1005         default:
1006                 dev_err(dummy_dev(dum_hcd), "Unsupported driver max speed %d\n",
1007                                 driver->max_speed);
1008                 return -EINVAL;
1009         }
1010
1011         /*
1012          * DEVICE side init ... the layer above hardware, which
1013          * can't enumerate without help from the driver we're binding.
1014          */
1015
1016         spin_lock_irq(&dum->lock);
1017         dum->devstatus = 0;
1018         dum->driver = driver;
1019         spin_unlock_irq(&dum->lock);
1020
1021         return 0;
1022 }
1023
1024 static int dummy_udc_stop(struct usb_gadget *g)
1025 {
1026         struct dummy_hcd        *dum_hcd = gadget_to_dummy_hcd(g);
1027         struct dummy            *dum = dum_hcd->dum;
1028
1029         spin_lock_irq(&dum->lock);
1030         dum->ints_enabled = 0;
1031         stop_activity(dum);
1032         dum->driver = NULL;
1033         spin_unlock_irq(&dum->lock);
1034
1035         return 0;
1036 }
1037
1038 #undef is_enabled
1039
1040 /* The gadget structure is stored inside the hcd structure and will be
1041  * released along with it. */
1042 static void init_dummy_udc_hw(struct dummy *dum)
1043 {
1044         int i;
1045
1046         INIT_LIST_HEAD(&dum->gadget.ep_list);
1047         for (i = 0; i < DUMMY_ENDPOINTS; i++) {
1048                 struct dummy_ep *ep = &dum->ep[i];
1049
1050                 if (!ep_info[i].name)
1051                         break;
1052                 ep->ep.name = ep_info[i].name;
1053                 ep->ep.caps = ep_info[i].caps;
1054                 ep->ep.ops = &dummy_ep_ops;
1055                 list_add_tail(&ep->ep.ep_list, &dum->gadget.ep_list);
1056                 ep->halted = ep->wedged = ep->already_seen =
1057                                 ep->setup_stage = 0;
1058                 usb_ep_set_maxpacket_limit(&ep->ep, ~0);
1059                 ep->ep.max_streams = 16;
1060                 ep->last_io = jiffies;
1061                 ep->gadget = &dum->gadget;
1062                 ep->desc = NULL;
1063                 INIT_LIST_HEAD(&ep->queue);
1064         }
1065
1066         dum->gadget.ep0 = &dum->ep[0].ep;
1067         list_del_init(&dum->ep[0].ep.ep_list);
1068         INIT_LIST_HEAD(&dum->fifo_req.queue);
1069
1070 #ifdef CONFIG_USB_OTG
1071         dum->gadget.is_otg = 1;
1072 #endif
1073 }
1074
1075 static int dummy_udc_probe(struct platform_device *pdev)
1076 {
1077         struct dummy    *dum;
1078         int             rc;
1079
1080         dum = *((void **)dev_get_platdata(&pdev->dev));
1081         /* Clear usb_gadget region for new registration to udc-core */
1082         memzero_explicit(&dum->gadget, sizeof(struct usb_gadget));
1083         dum->gadget.name = gadget_name;
1084         dum->gadget.ops = &dummy_ops;
1085         if (mod_data.is_super_speed)
1086                 dum->gadget.max_speed = USB_SPEED_SUPER;
1087         else if (mod_data.is_high_speed)
1088                 dum->gadget.max_speed = USB_SPEED_HIGH;
1089         else
1090                 dum->gadget.max_speed = USB_SPEED_FULL;
1091
1092         dum->gadget.dev.parent = &pdev->dev;
1093         init_dummy_udc_hw(dum);
1094
1095         rc = usb_add_gadget_udc(&pdev->dev, &dum->gadget);
1096         if (rc < 0)
1097                 goto err_udc;
1098
1099         rc = device_create_file(&dum->gadget.dev, &dev_attr_function);
1100         if (rc < 0)
1101                 goto err_dev;
1102         platform_set_drvdata(pdev, dum);
1103         return rc;
1104
1105 err_dev:
1106         usb_del_gadget_udc(&dum->gadget);
1107 err_udc:
1108         return rc;
1109 }
1110
1111 static void dummy_udc_remove(struct platform_device *pdev)
1112 {
1113         struct dummy    *dum = platform_get_drvdata(pdev);
1114
1115         device_remove_file(&dum->gadget.dev, &dev_attr_function);
1116         usb_del_gadget_udc(&dum->gadget);
1117 }
1118
1119 static void dummy_udc_pm(struct dummy *dum, struct dummy_hcd *dum_hcd,
1120                 int suspend)
1121 {
1122         spin_lock_irq(&dum->lock);
1123         dum->udc_suspended = suspend;
1124         set_link_state(dum_hcd);
1125         spin_unlock_irq(&dum->lock);
1126 }
1127
1128 static int dummy_udc_suspend(struct platform_device *pdev, pm_message_t state)
1129 {
1130         struct dummy            *dum = platform_get_drvdata(pdev);
1131         struct dummy_hcd        *dum_hcd = gadget_to_dummy_hcd(&dum->gadget);
1132
1133         dev_dbg(&pdev->dev, "%s\n", __func__);
1134         dummy_udc_pm(dum, dum_hcd, 1);
1135         usb_hcd_poll_rh_status(dummy_hcd_to_hcd(dum_hcd));
1136         return 0;
1137 }
1138
1139 static int dummy_udc_resume(struct platform_device *pdev)
1140 {
1141         struct dummy            *dum = platform_get_drvdata(pdev);
1142         struct dummy_hcd        *dum_hcd = gadget_to_dummy_hcd(&dum->gadget);
1143
1144         dev_dbg(&pdev->dev, "%s\n", __func__);
1145         dummy_udc_pm(dum, dum_hcd, 0);
1146         usb_hcd_poll_rh_status(dummy_hcd_to_hcd(dum_hcd));
1147         return 0;
1148 }
1149
1150 static struct platform_driver dummy_udc_driver = {
1151         .probe          = dummy_udc_probe,
1152         .remove_new     = dummy_udc_remove,
1153         .suspend        = dummy_udc_suspend,
1154         .resume         = dummy_udc_resume,
1155         .driver         = {
1156                 .name   = gadget_name,
1157         },
1158 };
1159
1160 /*-------------------------------------------------------------------------*/
1161
1162 static unsigned int dummy_get_ep_idx(const struct usb_endpoint_descriptor *desc)
1163 {
1164         unsigned int index;
1165
1166         index = usb_endpoint_num(desc) << 1;
1167         if (usb_endpoint_dir_in(desc))
1168                 index |= 1;
1169         return index;
1170 }
1171
1172 /* HOST SIDE DRIVER
1173  *
1174  * this uses the hcd framework to hook up to host side drivers.
1175  * its root hub will only have one device, otherwise it acts like
1176  * a normal host controller.
1177  *
1178  * when urbs are queued, they're just stuck on a list that we
1179  * scan in a timer callback.  that callback connects writes from
1180  * the host with reads from the device, and so on, based on the
1181  * usb 2.0 rules.
1182  */
1183
1184 static int dummy_ep_stream_en(struct dummy_hcd *dum_hcd, struct urb *urb)
1185 {
1186         const struct usb_endpoint_descriptor *desc = &urb->ep->desc;
1187         u32 index;
1188
1189         if (!usb_endpoint_xfer_bulk(desc))
1190                 return 0;
1191
1192         index = dummy_get_ep_idx(desc);
1193         return (1 << index) & dum_hcd->stream_en_ep;
1194 }
1195
1196 /*
1197  * The max stream number is saved as a nibble so for the 30 possible endpoints
1198  * we only 15 bytes of memory. Therefore we are limited to max 16 streams (0
1199  * means we use only 1 stream). The maximum according to the spec is 16bit so
1200  * if the 16 stream limit is about to go, the array size should be incremented
1201  * to 30 elements of type u16.
1202  */
1203 static int get_max_streams_for_pipe(struct dummy_hcd *dum_hcd,
1204                 unsigned int pipe)
1205 {
1206         int max_streams;
1207
1208         max_streams = dum_hcd->num_stream[usb_pipeendpoint(pipe)];
1209         if (usb_pipeout(pipe))
1210                 max_streams >>= 4;
1211         else
1212                 max_streams &= 0xf;
1213         max_streams++;
1214         return max_streams;
1215 }
1216
1217 static void set_max_streams_for_pipe(struct dummy_hcd *dum_hcd,
1218                 unsigned int pipe, unsigned int streams)
1219 {
1220         int max_streams;
1221
1222         streams--;
1223         max_streams = dum_hcd->num_stream[usb_pipeendpoint(pipe)];
1224         if (usb_pipeout(pipe)) {
1225                 streams <<= 4;
1226                 max_streams &= 0xf;
1227         } else {
1228                 max_streams &= 0xf0;
1229         }
1230         max_streams |= streams;
1231         dum_hcd->num_stream[usb_pipeendpoint(pipe)] = max_streams;
1232 }
1233
1234 static int dummy_validate_stream(struct dummy_hcd *dum_hcd, struct urb *urb)
1235 {
1236         unsigned int max_streams;
1237         int enabled;
1238
1239         enabled = dummy_ep_stream_en(dum_hcd, urb);
1240         if (!urb->stream_id) {
1241                 if (enabled)
1242                         return -EINVAL;
1243                 return 0;
1244         }
1245         if (!enabled)
1246                 return -EINVAL;
1247
1248         max_streams = get_max_streams_for_pipe(dum_hcd,
1249                         usb_pipeendpoint(urb->pipe));
1250         if (urb->stream_id > max_streams) {
1251                 dev_err(dummy_dev(dum_hcd), "Stream id %d is out of range.\n",
1252                                 urb->stream_id);
1253                 BUG();
1254                 return -EINVAL;
1255         }
1256         return 0;
1257 }
1258
1259 static int dummy_urb_enqueue(
1260         struct usb_hcd                  *hcd,
1261         struct urb                      *urb,
1262         gfp_t                           mem_flags
1263 ) {
1264         struct dummy_hcd *dum_hcd;
1265         struct urbp     *urbp;
1266         unsigned long   flags;
1267         int             rc;
1268
1269         urbp = kmalloc(sizeof *urbp, mem_flags);
1270         if (!urbp)
1271                 return -ENOMEM;
1272         urbp->urb = urb;
1273         urbp->miter_started = 0;
1274
1275         dum_hcd = hcd_to_dummy_hcd(hcd);
1276         spin_lock_irqsave(&dum_hcd->dum->lock, flags);
1277
1278         rc = dummy_validate_stream(dum_hcd, urb);
1279         if (rc) {
1280                 kfree(urbp);
1281                 goto done;
1282         }
1283
1284         rc = usb_hcd_link_urb_to_ep(hcd, urb);
1285         if (rc) {
1286                 kfree(urbp);
1287                 goto done;
1288         }
1289
1290         if (!dum_hcd->udev) {
1291                 dum_hcd->udev = urb->dev;
1292                 usb_get_dev(dum_hcd->udev);
1293         } else if (unlikely(dum_hcd->udev != urb->dev))
1294                 dev_err(dummy_dev(dum_hcd), "usb_device address has changed!\n");
1295
1296         list_add_tail(&urbp->urbp_list, &dum_hcd->urbp_list);
1297         urb->hcpriv = urbp;
1298         if (!dum_hcd->next_frame_urbp)
1299                 dum_hcd->next_frame_urbp = urbp;
1300         if (usb_pipetype(urb->pipe) == PIPE_CONTROL)
1301                 urb->error_count = 1;           /* mark as a new urb */
1302
1303         /* kick the scheduler, it'll do the rest */
1304         if (!timer_pending(&dum_hcd->timer))
1305                 mod_timer(&dum_hcd->timer, jiffies + 1);
1306
1307  done:
1308         spin_unlock_irqrestore(&dum_hcd->dum->lock, flags);
1309         return rc;
1310 }
1311
1312 static int dummy_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
1313 {
1314         struct dummy_hcd *dum_hcd;
1315         unsigned long   flags;
1316         int             rc;
1317
1318         /* giveback happens automatically in timer callback,
1319          * so make sure the callback happens */
1320         dum_hcd = hcd_to_dummy_hcd(hcd);
1321         spin_lock_irqsave(&dum_hcd->dum->lock, flags);
1322
1323         rc = usb_hcd_check_unlink_urb(hcd, urb, status);
1324         if (!rc && dum_hcd->rh_state != DUMMY_RH_RUNNING &&
1325                         !list_empty(&dum_hcd->urbp_list))
1326                 mod_timer(&dum_hcd->timer, jiffies);
1327
1328         spin_unlock_irqrestore(&dum_hcd->dum->lock, flags);
1329         return rc;
1330 }
1331
1332 static int dummy_perform_transfer(struct urb *urb, struct dummy_request *req,
1333                 u32 len)
1334 {
1335         void *ubuf, *rbuf;
1336         struct urbp *urbp = urb->hcpriv;
1337         int to_host;
1338         struct sg_mapping_iter *miter = &urbp->miter;
1339         u32 trans = 0;
1340         u32 this_sg;
1341         bool next_sg;
1342
1343         to_host = usb_urb_dir_in(urb);
1344         rbuf = req->req.buf + req->req.actual;
1345
1346         if (!urb->num_sgs) {
1347                 ubuf = urb->transfer_buffer + urb->actual_length;
1348                 if (to_host)
1349                         memcpy(ubuf, rbuf, len);
1350                 else
1351                         memcpy(rbuf, ubuf, len);
1352                 return len;
1353         }
1354
1355         if (!urbp->miter_started) {
1356                 u32 flags = SG_MITER_ATOMIC;
1357
1358                 if (to_host)
1359                         flags |= SG_MITER_TO_SG;
1360                 else
1361                         flags |= SG_MITER_FROM_SG;
1362
1363                 sg_miter_start(miter, urb->sg, urb->num_sgs, flags);
1364                 urbp->miter_started = 1;
1365         }
1366         next_sg = sg_miter_next(miter);
1367         if (next_sg == false) {
1368                 WARN_ON_ONCE(1);
1369                 return -EINVAL;
1370         }
1371         do {
1372                 ubuf = miter->addr;
1373                 this_sg = min_t(u32, len, miter->length);
1374                 miter->consumed = this_sg;
1375                 trans += this_sg;
1376
1377                 if (to_host)
1378                         memcpy(ubuf, rbuf, this_sg);
1379                 else
1380                         memcpy(rbuf, ubuf, this_sg);
1381                 len -= this_sg;
1382
1383                 if (!len)
1384                         break;
1385                 next_sg = sg_miter_next(miter);
1386                 if (next_sg == false) {
1387                         WARN_ON_ONCE(1);
1388                         return -EINVAL;
1389                 }
1390
1391                 rbuf += this_sg;
1392         } while (1);
1393
1394         sg_miter_stop(miter);
1395         return trans;
1396 }
1397
1398 /* transfer up to a frame's worth; caller must own lock */
1399 static int transfer(struct dummy_hcd *dum_hcd, struct urb *urb,
1400                 struct dummy_ep *ep, int limit, int *status)
1401 {
1402         struct dummy            *dum = dum_hcd->dum;
1403         struct dummy_request    *req;
1404         int                     sent = 0;
1405
1406 top:
1407         /* if there's no request queued, the device is NAKing; return */
1408         list_for_each_entry(req, &ep->queue, queue) {
1409                 unsigned        host_len, dev_len, len;
1410                 int             is_short, to_host;
1411                 int             rescan = 0;
1412
1413                 if (dummy_ep_stream_en(dum_hcd, urb)) {
1414                         if ((urb->stream_id != req->req.stream_id))
1415                                 continue;
1416                 }
1417
1418                 /* 1..N packets of ep->ep.maxpacket each ... the last one
1419                  * may be short (including zero length).
1420                  *
1421                  * writer can send a zlp explicitly (length 0) or implicitly
1422                  * (length mod maxpacket zero, and 'zero' flag); they always
1423                  * terminate reads.
1424                  */
1425                 host_len = urb->transfer_buffer_length - urb->actual_length;
1426                 dev_len = req->req.length - req->req.actual;
1427                 len = min(host_len, dev_len);
1428
1429                 /* FIXME update emulated data toggle too */
1430
1431                 to_host = usb_urb_dir_in(urb);
1432                 if (unlikely(len == 0))
1433                         is_short = 1;
1434                 else {
1435                         /* not enough bandwidth left? */
1436                         if (limit < ep->ep.maxpacket && limit < len)
1437                                 break;
1438                         len = min_t(unsigned, len, limit);
1439                         if (len == 0)
1440                                 break;
1441
1442                         /* send multiple of maxpacket first, then remainder */
1443                         if (len >= ep->ep.maxpacket) {
1444                                 is_short = 0;
1445                                 if (len % ep->ep.maxpacket)
1446                                         rescan = 1;
1447                                 len -= len % ep->ep.maxpacket;
1448                         } else {
1449                                 is_short = 1;
1450                         }
1451
1452                         len = dummy_perform_transfer(urb, req, len);
1453
1454                         ep->last_io = jiffies;
1455                         if ((int)len < 0) {
1456                                 req->req.status = len;
1457                         } else {
1458                                 limit -= len;
1459                                 sent += len;
1460                                 urb->actual_length += len;
1461                                 req->req.actual += len;
1462                         }
1463                 }
1464
1465                 /* short packets terminate, maybe with overflow/underflow.
1466                  * it's only really an error to write too much.
1467                  *
1468                  * partially filling a buffer optionally blocks queue advances
1469                  * (so completion handlers can clean up the queue) but we don't
1470                  * need to emulate such data-in-flight.
1471                  */
1472                 if (is_short) {
1473                         if (host_len == dev_len) {
1474                                 req->req.status = 0;
1475                                 *status = 0;
1476                         } else if (to_host) {
1477                                 req->req.status = 0;
1478                                 if (dev_len > host_len)
1479                                         *status = -EOVERFLOW;
1480                                 else
1481                                         *status = 0;
1482                         } else {
1483                                 *status = 0;
1484                                 if (host_len > dev_len)
1485                                         req->req.status = -EOVERFLOW;
1486                                 else
1487                                         req->req.status = 0;
1488                         }
1489
1490                 /*
1491                  * many requests terminate without a short packet.
1492                  * send a zlp if demanded by flags.
1493                  */
1494                 } else {
1495                         if (req->req.length == req->req.actual) {
1496                                 if (req->req.zero && to_host)
1497                                         rescan = 1;
1498                                 else
1499                                         req->req.status = 0;
1500                         }
1501                         if (urb->transfer_buffer_length == urb->actual_length) {
1502                                 if (urb->transfer_flags & URB_ZERO_PACKET &&
1503                                     !to_host)
1504                                         rescan = 1;
1505                                 else
1506                                         *status = 0;
1507                         }
1508                 }
1509
1510                 /* device side completion --> continuable */
1511                 if (req->req.status != -EINPROGRESS) {
1512                         list_del_init(&req->queue);
1513
1514                         spin_unlock(&dum->lock);
1515                         usb_gadget_giveback_request(&ep->ep, &req->req);
1516                         spin_lock(&dum->lock);
1517
1518                         /* requests might have been unlinked... */
1519                         rescan = 1;
1520                 }
1521
1522                 /* host side completion --> terminate */
1523                 if (*status != -EINPROGRESS)
1524                         break;
1525
1526                 /* rescan to continue with any other queued i/o */
1527                 if (rescan)
1528                         goto top;
1529         }
1530         return sent;
1531 }
1532
1533 static int periodic_bytes(struct dummy *dum, struct dummy_ep *ep)
1534 {
1535         int     limit = ep->ep.maxpacket;
1536
1537         if (dum->gadget.speed == USB_SPEED_HIGH) {
1538                 int     tmp;
1539
1540                 /* high bandwidth mode */
1541                 tmp = usb_endpoint_maxp_mult(ep->desc);
1542                 tmp *= 8 /* applies to entire frame */;
1543                 limit += limit * tmp;
1544         }
1545         if (dum->gadget.speed == USB_SPEED_SUPER) {
1546                 switch (usb_endpoint_type(ep->desc)) {
1547                 case USB_ENDPOINT_XFER_ISOC:
1548                         /* Sec. 4.4.8.2 USB3.0 Spec */
1549                         limit = 3 * 16 * 1024 * 8;
1550                         break;
1551                 case USB_ENDPOINT_XFER_INT:
1552                         /* Sec. 4.4.7.2 USB3.0 Spec */
1553                         limit = 3 * 1024 * 8;
1554                         break;
1555                 case USB_ENDPOINT_XFER_BULK:
1556                 default:
1557                         break;
1558                 }
1559         }
1560         return limit;
1561 }
1562
1563 #define is_active(dum_hcd)      ((dum_hcd->port_status & \
1564                 (USB_PORT_STAT_CONNECTION | USB_PORT_STAT_ENABLE | \
1565                         USB_PORT_STAT_SUSPEND)) \
1566                 == (USB_PORT_STAT_CONNECTION | USB_PORT_STAT_ENABLE))
1567
1568 static struct dummy_ep *find_endpoint(struct dummy *dum, u8 address)
1569 {
1570         int             i;
1571
1572         if (!is_active((dum->gadget.speed == USB_SPEED_SUPER ?
1573                         dum->ss_hcd : dum->hs_hcd)))
1574                 return NULL;
1575         if (!dum->ints_enabled)
1576                 return NULL;
1577         if ((address & ~USB_DIR_IN) == 0)
1578                 return &dum->ep[0];
1579         for (i = 1; i < DUMMY_ENDPOINTS; i++) {
1580                 struct dummy_ep *ep = &dum->ep[i];
1581
1582                 if (!ep->desc)
1583                         continue;
1584                 if (ep->desc->bEndpointAddress == address)
1585                         return ep;
1586         }
1587         return NULL;
1588 }
1589
1590 #undef is_active
1591
1592 #define Dev_Request     (USB_TYPE_STANDARD | USB_RECIP_DEVICE)
1593 #define Dev_InRequest   (Dev_Request | USB_DIR_IN)
1594 #define Intf_Request    (USB_TYPE_STANDARD | USB_RECIP_INTERFACE)
1595 #define Intf_InRequest  (Intf_Request | USB_DIR_IN)
1596 #define Ep_Request      (USB_TYPE_STANDARD | USB_RECIP_ENDPOINT)
1597 #define Ep_InRequest    (Ep_Request | USB_DIR_IN)
1598
1599
1600 /**
1601  * handle_control_request() - handles all control transfers
1602  * @dum_hcd: pointer to dummy (the_controller)
1603  * @urb: the urb request to handle
1604  * @setup: pointer to the setup data for a USB device control
1605  *       request
1606  * @status: pointer to request handling status
1607  *
1608  * Return 0 - if the request was handled
1609  *        1 - if the request wasn't handles
1610  *        error code on error
1611  */
1612 static int handle_control_request(struct dummy_hcd *dum_hcd, struct urb *urb,
1613                                   struct usb_ctrlrequest *setup,
1614                                   int *status)
1615 {
1616         struct dummy_ep         *ep2;
1617         struct dummy            *dum = dum_hcd->dum;
1618         int                     ret_val = 1;
1619         unsigned        w_index;
1620         unsigned        w_value;
1621
1622         w_index = le16_to_cpu(setup->wIndex);
1623         w_value = le16_to_cpu(setup->wValue);
1624         switch (setup->bRequest) {
1625         case USB_REQ_SET_ADDRESS:
1626                 if (setup->bRequestType != Dev_Request)
1627                         break;
1628                 dum->address = w_value;
1629                 *status = 0;
1630                 dev_dbg(udc_dev(dum), "set_address = %d\n",
1631                                 w_value);
1632                 ret_val = 0;
1633                 break;
1634         case USB_REQ_SET_FEATURE:
1635                 if (setup->bRequestType == Dev_Request) {
1636                         ret_val = 0;
1637                         switch (w_value) {
1638                         case USB_DEVICE_REMOTE_WAKEUP:
1639                                 break;
1640                         case USB_DEVICE_B_HNP_ENABLE:
1641                                 dum->gadget.b_hnp_enable = 1;
1642                                 break;
1643                         case USB_DEVICE_A_HNP_SUPPORT:
1644                                 dum->gadget.a_hnp_support = 1;
1645                                 break;
1646                         case USB_DEVICE_A_ALT_HNP_SUPPORT:
1647                                 dum->gadget.a_alt_hnp_support = 1;
1648                                 break;
1649                         case USB_DEVICE_U1_ENABLE:
1650                                 if (dummy_hcd_to_hcd(dum_hcd)->speed ==
1651                                     HCD_USB3)
1652                                         w_value = USB_DEV_STAT_U1_ENABLED;
1653                                 else
1654                                         ret_val = -EOPNOTSUPP;
1655                                 break;
1656                         case USB_DEVICE_U2_ENABLE:
1657                                 if (dummy_hcd_to_hcd(dum_hcd)->speed ==
1658                                     HCD_USB3)
1659                                         w_value = USB_DEV_STAT_U2_ENABLED;
1660                                 else
1661                                         ret_val = -EOPNOTSUPP;
1662                                 break;
1663                         case USB_DEVICE_LTM_ENABLE:
1664                                 if (dummy_hcd_to_hcd(dum_hcd)->speed ==
1665                                     HCD_USB3)
1666                                         w_value = USB_DEV_STAT_LTM_ENABLED;
1667                                 else
1668                                         ret_val = -EOPNOTSUPP;
1669                                 break;
1670                         default:
1671                                 ret_val = -EOPNOTSUPP;
1672                         }
1673                         if (ret_val == 0) {
1674                                 dum->devstatus |= (1 << w_value);
1675                                 *status = 0;
1676                         }
1677                 } else if (setup->bRequestType == Ep_Request) {
1678                         /* endpoint halt */
1679                         ep2 = find_endpoint(dum, w_index);
1680                         if (!ep2 || ep2->ep.name == ep0name) {
1681                                 ret_val = -EOPNOTSUPP;
1682                                 break;
1683                         }
1684                         ep2->halted = 1;
1685                         ret_val = 0;
1686                         *status = 0;
1687                 }
1688                 break;
1689         case USB_REQ_CLEAR_FEATURE:
1690                 if (setup->bRequestType == Dev_Request) {
1691                         ret_val = 0;
1692                         switch (w_value) {
1693                         case USB_DEVICE_REMOTE_WAKEUP:
1694                                 w_value = USB_DEVICE_REMOTE_WAKEUP;
1695                                 break;
1696                         case USB_DEVICE_U1_ENABLE:
1697                                 if (dummy_hcd_to_hcd(dum_hcd)->speed ==
1698                                     HCD_USB3)
1699                                         w_value = USB_DEV_STAT_U1_ENABLED;
1700                                 else
1701                                         ret_val = -EOPNOTSUPP;
1702                                 break;
1703                         case USB_DEVICE_U2_ENABLE:
1704                                 if (dummy_hcd_to_hcd(dum_hcd)->speed ==
1705                                     HCD_USB3)
1706                                         w_value = USB_DEV_STAT_U2_ENABLED;
1707                                 else
1708                                         ret_val = -EOPNOTSUPP;
1709                                 break;
1710                         case USB_DEVICE_LTM_ENABLE:
1711                                 if (dummy_hcd_to_hcd(dum_hcd)->speed ==
1712                                     HCD_USB3)
1713                                         w_value = USB_DEV_STAT_LTM_ENABLED;
1714                                 else
1715                                         ret_val = -EOPNOTSUPP;
1716                                 break;
1717                         default:
1718                                 ret_val = -EOPNOTSUPP;
1719                                 break;
1720                         }
1721                         if (ret_val == 0) {
1722                                 dum->devstatus &= ~(1 << w_value);
1723                                 *status = 0;
1724                         }
1725                 } else if (setup->bRequestType == Ep_Request) {
1726                         /* endpoint halt */
1727                         ep2 = find_endpoint(dum, w_index);
1728                         if (!ep2) {
1729                                 ret_val = -EOPNOTSUPP;
1730                                 break;
1731                         }
1732                         if (!ep2->wedged)
1733                                 ep2->halted = 0;
1734                         ret_val = 0;
1735                         *status = 0;
1736                 }
1737                 break;
1738         case USB_REQ_GET_STATUS:
1739                 if (setup->bRequestType == Dev_InRequest
1740                                 || setup->bRequestType == Intf_InRequest
1741                                 || setup->bRequestType == Ep_InRequest) {
1742                         char *buf;
1743                         /*
1744                          * device: remote wakeup, selfpowered
1745                          * interface: nothing
1746                          * endpoint: halt
1747                          */
1748                         buf = (char *)urb->transfer_buffer;
1749                         if (urb->transfer_buffer_length > 0) {
1750                                 if (setup->bRequestType == Ep_InRequest) {
1751                                         ep2 = find_endpoint(dum, w_index);
1752                                         if (!ep2) {
1753                                                 ret_val = -EOPNOTSUPP;
1754                                                 break;
1755                                         }
1756                                         buf[0] = ep2->halted;
1757                                 } else if (setup->bRequestType ==
1758                                            Dev_InRequest) {
1759                                         buf[0] = (u8)dum->devstatus;
1760                                 } else
1761                                         buf[0] = 0;
1762                         }
1763                         if (urb->transfer_buffer_length > 1)
1764                                 buf[1] = 0;
1765                         urb->actual_length = min_t(u32, 2,
1766                                 urb->transfer_buffer_length);
1767                         ret_val = 0;
1768                         *status = 0;
1769                 }
1770                 break;
1771         }
1772         return ret_val;
1773 }
1774
1775 /*
1776  * Drive both sides of the transfers; looks like irq handlers to both
1777  * drivers except that the callbacks are invoked from soft interrupt
1778  * context.
1779  */
1780 static void dummy_timer(struct timer_list *t)
1781 {
1782         struct dummy_hcd        *dum_hcd = from_timer(dum_hcd, t, timer);
1783         struct dummy            *dum = dum_hcd->dum;
1784         struct urbp             *urbp, *tmp;
1785         unsigned long           flags;
1786         int                     limit, total;
1787         int                     i;
1788
1789         /* simplistic model for one frame's bandwidth */
1790         /* FIXME: account for transaction and packet overhead */
1791         switch (dum->gadget.speed) {
1792         case USB_SPEED_LOW:
1793                 total = 8/*bytes*/ * 12/*packets*/;
1794                 break;
1795         case USB_SPEED_FULL:
1796                 total = 64/*bytes*/ * 19/*packets*/;
1797                 break;
1798         case USB_SPEED_HIGH:
1799                 total = 512/*bytes*/ * 13/*packets*/ * 8/*uframes*/;
1800                 break;
1801         case USB_SPEED_SUPER:
1802                 /* Bus speed is 500000 bytes/ms, so use a little less */
1803                 total = 490000;
1804                 break;
1805         default:        /* Can't happen */
1806                 dev_err(dummy_dev(dum_hcd), "bogus device speed\n");
1807                 total = 0;
1808                 break;
1809         }
1810
1811         /* FIXME if HZ != 1000 this will probably misbehave ... */
1812
1813         /* look at each urb queued by the host side driver */
1814         spin_lock_irqsave(&dum->lock, flags);
1815
1816         if (!dum_hcd->udev) {
1817                 dev_err(dummy_dev(dum_hcd),
1818                                 "timer fired with no URBs pending?\n");
1819                 spin_unlock_irqrestore(&dum->lock, flags);
1820                 return;
1821         }
1822         dum_hcd->next_frame_urbp = NULL;
1823
1824         for (i = 0; i < DUMMY_ENDPOINTS; i++) {
1825                 if (!ep_info[i].name)
1826                         break;
1827                 dum->ep[i].already_seen = 0;
1828         }
1829
1830 restart:
1831         list_for_each_entry_safe(urbp, tmp, &dum_hcd->urbp_list, urbp_list) {
1832                 struct urb              *urb;
1833                 struct dummy_request    *req;
1834                 u8                      address;
1835                 struct dummy_ep         *ep = NULL;
1836                 int                     status = -EINPROGRESS;
1837
1838                 /* stop when we reach URBs queued after the timer interrupt */
1839                 if (urbp == dum_hcd->next_frame_urbp)
1840                         break;
1841
1842                 urb = urbp->urb;
1843                 if (urb->unlinked)
1844                         goto return_urb;
1845                 else if (dum_hcd->rh_state != DUMMY_RH_RUNNING)
1846                         continue;
1847
1848                 /* Used up this frame's bandwidth? */
1849                 if (total <= 0)
1850                         continue;
1851
1852                 /* find the gadget's ep for this request (if configured) */
1853                 address = usb_pipeendpoint (urb->pipe);
1854                 if (usb_urb_dir_in(urb))
1855                         address |= USB_DIR_IN;
1856                 ep = find_endpoint(dum, address);
1857                 if (!ep) {
1858                         /* set_configuration() disagreement */
1859                         dev_dbg(dummy_dev(dum_hcd),
1860                                 "no ep configured for urb %p\n",
1861                                 urb);
1862                         status = -EPROTO;
1863                         goto return_urb;
1864                 }
1865
1866                 if (ep->already_seen)
1867                         continue;
1868                 ep->already_seen = 1;
1869                 if (ep == &dum->ep[0] && urb->error_count) {
1870                         ep->setup_stage = 1;    /* a new urb */
1871                         urb->error_count = 0;
1872                 }
1873                 if (ep->halted && !ep->setup_stage) {
1874                         /* NOTE: must not be iso! */
1875                         dev_dbg(dummy_dev(dum_hcd), "ep %s halted, urb %p\n",
1876                                         ep->ep.name, urb);
1877                         status = -EPIPE;
1878                         goto return_urb;
1879                 }
1880                 /* FIXME make sure both ends agree on maxpacket */
1881
1882                 /* handle control requests */
1883                 if (ep == &dum->ep[0] && ep->setup_stage) {
1884                         struct usb_ctrlrequest          setup;
1885                         int                             value;
1886
1887                         setup = *(struct usb_ctrlrequest *) urb->setup_packet;
1888                         /* paranoia, in case of stale queued data */
1889                         list_for_each_entry(req, &ep->queue, queue) {
1890                                 list_del_init(&req->queue);
1891                                 req->req.status = -EOVERFLOW;
1892                                 dev_dbg(udc_dev(dum), "stale req = %p\n",
1893                                                 req);
1894
1895                                 spin_unlock(&dum->lock);
1896                                 usb_gadget_giveback_request(&ep->ep, &req->req);
1897                                 spin_lock(&dum->lock);
1898                                 ep->already_seen = 0;
1899                                 goto restart;
1900                         }
1901
1902                         /* gadget driver never sees set_address or operations
1903                          * on standard feature flags.  some hardware doesn't
1904                          * even expose them.
1905                          */
1906                         ep->last_io = jiffies;
1907                         ep->setup_stage = 0;
1908                         ep->halted = 0;
1909
1910                         value = handle_control_request(dum_hcd, urb, &setup,
1911                                                        &status);
1912
1913                         /* gadget driver handles all other requests.  block
1914                          * until setup() returns; no reentrancy issues etc.
1915                          */
1916                         if (value > 0) {
1917                                 ++dum->callback_usage;
1918                                 spin_unlock(&dum->lock);
1919                                 value = dum->driver->setup(&dum->gadget,
1920                                                 &setup);
1921                                 spin_lock(&dum->lock);
1922                                 --dum->callback_usage;
1923
1924                                 if (value >= 0) {
1925                                         /* no delays (max 64KB data stage) */
1926                                         limit = 64*1024;
1927                                         goto treat_control_like_bulk;
1928                                 }
1929                                 /* error, see below */
1930                         }
1931
1932                         if (value < 0) {
1933                                 if (value != -EOPNOTSUPP)
1934                                         dev_dbg(udc_dev(dum),
1935                                                 "setup --> %d\n",
1936                                                 value);
1937                                 status = -EPIPE;
1938                                 urb->actual_length = 0;
1939                         }
1940
1941                         goto return_urb;
1942                 }
1943
1944                 /* non-control requests */
1945                 limit = total;
1946                 switch (usb_pipetype(urb->pipe)) {
1947                 case PIPE_ISOCHRONOUS:
1948                         /*
1949                          * We don't support isochronous.  But if we did,
1950                          * here are some of the issues we'd have to face:
1951                          *
1952                          * Is it urb->interval since the last xfer?
1953                          * Use urb->iso_frame_desc[i].
1954                          * Complete whether or not ep has requests queued.
1955                          * Report random errors, to debug drivers.
1956                          */
1957                         limit = max(limit, periodic_bytes(dum, ep));
1958                         status = -EINVAL;       /* fail all xfers */
1959                         break;
1960
1961                 case PIPE_INTERRUPT:
1962                         /* FIXME is it urb->interval since the last xfer?
1963                          * this almost certainly polls too fast.
1964                          */
1965                         limit = max(limit, periodic_bytes(dum, ep));
1966                         fallthrough;
1967
1968                 default:
1969 treat_control_like_bulk:
1970                         ep->last_io = jiffies;
1971                         total -= transfer(dum_hcd, urb, ep, limit, &status);
1972                         break;
1973                 }
1974
1975                 /* incomplete transfer? */
1976                 if (status == -EINPROGRESS)
1977                         continue;
1978
1979 return_urb:
1980                 list_del(&urbp->urbp_list);
1981                 kfree(urbp);
1982                 if (ep)
1983                         ep->already_seen = ep->setup_stage = 0;
1984
1985                 usb_hcd_unlink_urb_from_ep(dummy_hcd_to_hcd(dum_hcd), urb);
1986                 spin_unlock(&dum->lock);
1987                 usb_hcd_giveback_urb(dummy_hcd_to_hcd(dum_hcd), urb, status);
1988                 spin_lock(&dum->lock);
1989
1990                 goto restart;
1991         }
1992
1993         if (list_empty(&dum_hcd->urbp_list)) {
1994                 usb_put_dev(dum_hcd->udev);
1995                 dum_hcd->udev = NULL;
1996         } else if (dum_hcd->rh_state == DUMMY_RH_RUNNING) {
1997                 /* want a 1 msec delay here */
1998                 mod_timer(&dum_hcd->timer, jiffies + msecs_to_jiffies(1));
1999         }
2000
2001         spin_unlock_irqrestore(&dum->lock, flags);
2002 }
2003
2004 /*-------------------------------------------------------------------------*/
2005
2006 #define PORT_C_MASK \
2007         ((USB_PORT_STAT_C_CONNECTION \
2008         | USB_PORT_STAT_C_ENABLE \
2009         | USB_PORT_STAT_C_SUSPEND \
2010         | USB_PORT_STAT_C_OVERCURRENT \
2011         | USB_PORT_STAT_C_RESET) << 16)
2012
2013 static int dummy_hub_status(struct usb_hcd *hcd, char *buf)
2014 {
2015         struct dummy_hcd        *dum_hcd;
2016         unsigned long           flags;
2017         int                     retval = 0;
2018
2019         dum_hcd = hcd_to_dummy_hcd(hcd);
2020
2021         spin_lock_irqsave(&dum_hcd->dum->lock, flags);
2022         if (!HCD_HW_ACCESSIBLE(hcd))
2023                 goto done;
2024
2025         if (dum_hcd->resuming && time_after_eq(jiffies, dum_hcd->re_timeout)) {
2026                 dum_hcd->port_status |= (USB_PORT_STAT_C_SUSPEND << 16);
2027                 dum_hcd->port_status &= ~USB_PORT_STAT_SUSPEND;
2028                 set_link_state(dum_hcd);
2029         }
2030
2031         if ((dum_hcd->port_status & PORT_C_MASK) != 0) {
2032                 *buf = (1 << 1);
2033                 dev_dbg(dummy_dev(dum_hcd), "port status 0x%08x has changes\n",
2034                                 dum_hcd->port_status);
2035                 retval = 1;
2036                 if (dum_hcd->rh_state == DUMMY_RH_SUSPENDED)
2037                         usb_hcd_resume_root_hub(hcd);
2038         }
2039 done:
2040         spin_unlock_irqrestore(&dum_hcd->dum->lock, flags);
2041         return retval;
2042 }
2043
2044 /* usb 3.0 root hub device descriptor */
2045 static struct {
2046         struct usb_bos_descriptor bos;
2047         struct usb_ss_cap_descriptor ss_cap;
2048 } __packed usb3_bos_desc = {
2049
2050         .bos = {
2051                 .bLength                = USB_DT_BOS_SIZE,
2052                 .bDescriptorType        = USB_DT_BOS,
2053                 .wTotalLength           = cpu_to_le16(sizeof(usb3_bos_desc)),
2054                 .bNumDeviceCaps         = 1,
2055         },
2056         .ss_cap = {
2057                 .bLength                = USB_DT_USB_SS_CAP_SIZE,
2058                 .bDescriptorType        = USB_DT_DEVICE_CAPABILITY,
2059                 .bDevCapabilityType     = USB_SS_CAP_TYPE,
2060                 .wSpeedSupported        = cpu_to_le16(USB_5GBPS_OPERATION),
2061                 .bFunctionalitySupport  = ilog2(USB_5GBPS_OPERATION),
2062         },
2063 };
2064
2065 static inline void
2066 ss_hub_descriptor(struct usb_hub_descriptor *desc)
2067 {
2068         memset(desc, 0, sizeof *desc);
2069         desc->bDescriptorType = USB_DT_SS_HUB;
2070         desc->bDescLength = 12;
2071         desc->wHubCharacteristics = cpu_to_le16(
2072                         HUB_CHAR_INDV_PORT_LPSM |
2073                         HUB_CHAR_COMMON_OCPM);
2074         desc->bNbrPorts = 1;
2075         desc->u.ss.bHubHdrDecLat = 0x04; /* Worst case: 0.4 micro sec*/
2076         desc->u.ss.DeviceRemovable = 0;
2077 }
2078
2079 static inline void hub_descriptor(struct usb_hub_descriptor *desc)
2080 {
2081         memset(desc, 0, sizeof *desc);
2082         desc->bDescriptorType = USB_DT_HUB;
2083         desc->bDescLength = 9;
2084         desc->wHubCharacteristics = cpu_to_le16(
2085                         HUB_CHAR_INDV_PORT_LPSM |
2086                         HUB_CHAR_COMMON_OCPM);
2087         desc->bNbrPorts = 1;
2088         desc->u.hs.DeviceRemovable[0] = 0;
2089         desc->u.hs.DeviceRemovable[1] = 0xff;   /* PortPwrCtrlMask */
2090 }
2091
2092 static int dummy_hub_control(
2093         struct usb_hcd  *hcd,
2094         u16             typeReq,
2095         u16             wValue,
2096         u16             wIndex,
2097         char            *buf,
2098         u16             wLength
2099 ) {
2100         struct dummy_hcd *dum_hcd;
2101         int             retval = 0;
2102         unsigned long   flags;
2103
2104         if (!HCD_HW_ACCESSIBLE(hcd))
2105                 return -ETIMEDOUT;
2106
2107         dum_hcd = hcd_to_dummy_hcd(hcd);
2108
2109         spin_lock_irqsave(&dum_hcd->dum->lock, flags);
2110         switch (typeReq) {
2111         case ClearHubFeature:
2112                 break;
2113         case ClearPortFeature:
2114                 switch (wValue) {
2115                 case USB_PORT_FEAT_SUSPEND:
2116                         if (hcd->speed == HCD_USB3) {
2117                                 dev_dbg(dummy_dev(dum_hcd),
2118                                          "USB_PORT_FEAT_SUSPEND req not "
2119                                          "supported for USB 3.0 roothub\n");
2120                                 goto error;
2121                         }
2122                         if (dum_hcd->port_status & USB_PORT_STAT_SUSPEND) {
2123                                 /* 20msec resume signaling */
2124                                 dum_hcd->resuming = 1;
2125                                 dum_hcd->re_timeout = jiffies +
2126                                                 msecs_to_jiffies(20);
2127                         }
2128                         break;
2129                 case USB_PORT_FEAT_POWER:
2130                         dev_dbg(dummy_dev(dum_hcd), "power-off\n");
2131                         if (hcd->speed == HCD_USB3)
2132                                 dum_hcd->port_status &= ~USB_SS_PORT_STAT_POWER;
2133                         else
2134                                 dum_hcd->port_status &= ~USB_PORT_STAT_POWER;
2135                         set_link_state(dum_hcd);
2136                         break;
2137                 case USB_PORT_FEAT_ENABLE:
2138                 case USB_PORT_FEAT_C_ENABLE:
2139                 case USB_PORT_FEAT_C_SUSPEND:
2140                         /* Not allowed for USB-3 */
2141                         if (hcd->speed == HCD_USB3)
2142                                 goto error;
2143                         fallthrough;
2144                 case USB_PORT_FEAT_C_CONNECTION:
2145                 case USB_PORT_FEAT_C_RESET:
2146                         dum_hcd->port_status &= ~(1 << wValue);
2147                         set_link_state(dum_hcd);
2148                         break;
2149                 default:
2150                 /* Disallow INDICATOR and C_OVER_CURRENT */
2151                         goto error;
2152                 }
2153                 break;
2154         case GetHubDescriptor:
2155                 if (hcd->speed == HCD_USB3 &&
2156                                 (wLength < USB_DT_SS_HUB_SIZE ||
2157                                  wValue != (USB_DT_SS_HUB << 8))) {
2158                         dev_dbg(dummy_dev(dum_hcd),
2159                                 "Wrong hub descriptor type for "
2160                                 "USB 3.0 roothub.\n");
2161                         goto error;
2162                 }
2163                 if (hcd->speed == HCD_USB3)
2164                         ss_hub_descriptor((struct usb_hub_descriptor *) buf);
2165                 else
2166                         hub_descriptor((struct usb_hub_descriptor *) buf);
2167                 break;
2168
2169         case DeviceRequest | USB_REQ_GET_DESCRIPTOR:
2170                 if (hcd->speed != HCD_USB3)
2171                         goto error;
2172
2173                 if ((wValue >> 8) != USB_DT_BOS)
2174                         goto error;
2175
2176                 memcpy(buf, &usb3_bos_desc, sizeof(usb3_bos_desc));
2177                 retval = sizeof(usb3_bos_desc);
2178                 break;
2179
2180         case GetHubStatus:
2181                 *(__le32 *) buf = cpu_to_le32(0);
2182                 break;
2183         case GetPortStatus:
2184                 if (wIndex != 1)
2185                         retval = -EPIPE;
2186
2187                 /* whoever resets or resumes must GetPortStatus to
2188                  * complete it!!
2189                  */
2190                 if (dum_hcd->resuming &&
2191                                 time_after_eq(jiffies, dum_hcd->re_timeout)) {
2192                         dum_hcd->port_status |= (USB_PORT_STAT_C_SUSPEND << 16);
2193                         dum_hcd->port_status &= ~USB_PORT_STAT_SUSPEND;
2194                 }
2195                 if ((dum_hcd->port_status & USB_PORT_STAT_RESET) != 0 &&
2196                                 time_after_eq(jiffies, dum_hcd->re_timeout)) {
2197                         dum_hcd->port_status |= (USB_PORT_STAT_C_RESET << 16);
2198                         dum_hcd->port_status &= ~USB_PORT_STAT_RESET;
2199                         if (dum_hcd->dum->pullup) {
2200                                 dum_hcd->port_status |= USB_PORT_STAT_ENABLE;
2201
2202                                 if (hcd->speed < HCD_USB3) {
2203                                         switch (dum_hcd->dum->gadget.speed) {
2204                                         case USB_SPEED_HIGH:
2205                                                 dum_hcd->port_status |=
2206                                                       USB_PORT_STAT_HIGH_SPEED;
2207                                                 break;
2208                                         case USB_SPEED_LOW:
2209                                                 dum_hcd->dum->gadget.ep0->
2210                                                         maxpacket = 8;
2211                                                 dum_hcd->port_status |=
2212                                                         USB_PORT_STAT_LOW_SPEED;
2213                                                 break;
2214                                         default:
2215                                                 break;
2216                                         }
2217                                 }
2218                         }
2219                 }
2220                 set_link_state(dum_hcd);
2221                 ((__le16 *) buf)[0] = cpu_to_le16(dum_hcd->port_status);
2222                 ((__le16 *) buf)[1] = cpu_to_le16(dum_hcd->port_status >> 16);
2223                 break;
2224         case SetHubFeature:
2225                 retval = -EPIPE;
2226                 break;
2227         case SetPortFeature:
2228                 switch (wValue) {
2229                 case USB_PORT_FEAT_LINK_STATE:
2230                         if (hcd->speed != HCD_USB3) {
2231                                 dev_dbg(dummy_dev(dum_hcd),
2232                                          "USB_PORT_FEAT_LINK_STATE req not "
2233                                          "supported for USB 2.0 roothub\n");
2234                                 goto error;
2235                         }
2236                         /*
2237                          * Since this is dummy we don't have an actual link so
2238                          * there is nothing to do for the SET_LINK_STATE cmd
2239                          */
2240                         break;
2241                 case USB_PORT_FEAT_U1_TIMEOUT:
2242                 case USB_PORT_FEAT_U2_TIMEOUT:
2243                         /* TODO: add suspend/resume support! */
2244                         if (hcd->speed != HCD_USB3) {
2245                                 dev_dbg(dummy_dev(dum_hcd),
2246                                          "USB_PORT_FEAT_U1/2_TIMEOUT req not "
2247                                          "supported for USB 2.0 roothub\n");
2248                                 goto error;
2249                         }
2250                         break;
2251                 case USB_PORT_FEAT_SUSPEND:
2252                         /* Applicable only for USB2.0 hub */
2253                         if (hcd->speed == HCD_USB3) {
2254                                 dev_dbg(dummy_dev(dum_hcd),
2255                                          "USB_PORT_FEAT_SUSPEND req not "
2256                                          "supported for USB 3.0 roothub\n");
2257                                 goto error;
2258                         }
2259                         if (dum_hcd->active) {
2260                                 dum_hcd->port_status |= USB_PORT_STAT_SUSPEND;
2261
2262                                 /* HNP would happen here; for now we
2263                                  * assume b_bus_req is always true.
2264                                  */
2265                                 set_link_state(dum_hcd);
2266                                 if (((1 << USB_DEVICE_B_HNP_ENABLE)
2267                                                 & dum_hcd->dum->devstatus) != 0)
2268                                         dev_dbg(dummy_dev(dum_hcd),
2269                                                         "no HNP yet!\n");
2270                         }
2271                         break;
2272                 case USB_PORT_FEAT_POWER:
2273                         if (hcd->speed == HCD_USB3)
2274                                 dum_hcd->port_status |= USB_SS_PORT_STAT_POWER;
2275                         else
2276                                 dum_hcd->port_status |= USB_PORT_STAT_POWER;
2277                         set_link_state(dum_hcd);
2278                         break;
2279                 case USB_PORT_FEAT_BH_PORT_RESET:
2280                         /* Applicable only for USB3.0 hub */
2281                         if (hcd->speed != HCD_USB3) {
2282                                 dev_dbg(dummy_dev(dum_hcd),
2283                                          "USB_PORT_FEAT_BH_PORT_RESET req not "
2284                                          "supported for USB 2.0 roothub\n");
2285                                 goto error;
2286                         }
2287                         fallthrough;
2288                 case USB_PORT_FEAT_RESET:
2289                         if (!(dum_hcd->port_status & USB_PORT_STAT_CONNECTION))
2290                                 break;
2291                         /* if it's already enabled, disable */
2292                         if (hcd->speed == HCD_USB3) {
2293                                 dum_hcd->port_status =
2294                                         (USB_SS_PORT_STAT_POWER |
2295                                          USB_PORT_STAT_CONNECTION |
2296                                          USB_PORT_STAT_RESET);
2297                         } else {
2298                                 dum_hcd->port_status &= ~(USB_PORT_STAT_ENABLE
2299                                         | USB_PORT_STAT_LOW_SPEED
2300                                         | USB_PORT_STAT_HIGH_SPEED);
2301                                 dum_hcd->port_status |= USB_PORT_STAT_RESET;
2302                         }
2303                         /*
2304                          * We want to reset device status. All but the
2305                          * Self powered feature
2306                          */
2307                         dum_hcd->dum->devstatus &=
2308                                 (1 << USB_DEVICE_SELF_POWERED);
2309                         /*
2310                          * FIXME USB3.0: what is the correct reset signaling
2311                          * interval? Is it still 50msec as for HS?
2312                          */
2313                         dum_hcd->re_timeout = jiffies + msecs_to_jiffies(50);
2314                         set_link_state(dum_hcd);
2315                         break;
2316                 case USB_PORT_FEAT_C_CONNECTION:
2317                 case USB_PORT_FEAT_C_RESET:
2318                 case USB_PORT_FEAT_C_ENABLE:
2319                 case USB_PORT_FEAT_C_SUSPEND:
2320                         /* Not allowed for USB-3, and ignored for USB-2 */
2321                         if (hcd->speed == HCD_USB3)
2322                                 goto error;
2323                         break;
2324                 default:
2325                 /* Disallow TEST, INDICATOR, and C_OVER_CURRENT */
2326                         goto error;
2327                 }
2328                 break;
2329         case GetPortErrorCount:
2330                 if (hcd->speed != HCD_USB3) {
2331                         dev_dbg(dummy_dev(dum_hcd),
2332                                  "GetPortErrorCount req not "
2333                                  "supported for USB 2.0 roothub\n");
2334                         goto error;
2335                 }
2336                 /* We'll always return 0 since this is a dummy hub */
2337                 *(__le32 *) buf = cpu_to_le32(0);
2338                 break;
2339         case SetHubDepth:
2340                 if (hcd->speed != HCD_USB3) {
2341                         dev_dbg(dummy_dev(dum_hcd),
2342                                  "SetHubDepth req not supported for "
2343                                  "USB 2.0 roothub\n");
2344                         goto error;
2345                 }
2346                 break;
2347         default:
2348                 dev_dbg(dummy_dev(dum_hcd),
2349                         "hub control req%04x v%04x i%04x l%d\n",
2350                         typeReq, wValue, wIndex, wLength);
2351 error:
2352                 /* "protocol stall" on error */
2353                 retval = -EPIPE;
2354         }
2355         spin_unlock_irqrestore(&dum_hcd->dum->lock, flags);
2356
2357         if ((dum_hcd->port_status & PORT_C_MASK) != 0)
2358                 usb_hcd_poll_rh_status(hcd);
2359         return retval;
2360 }
2361
2362 static int dummy_bus_suspend(struct usb_hcd *hcd)
2363 {
2364         struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd);
2365
2366         dev_dbg(&hcd->self.root_hub->dev, "%s\n", __func__);
2367
2368         spin_lock_irq(&dum_hcd->dum->lock);
2369         dum_hcd->rh_state = DUMMY_RH_SUSPENDED;
2370         set_link_state(dum_hcd);
2371         hcd->state = HC_STATE_SUSPENDED;
2372         spin_unlock_irq(&dum_hcd->dum->lock);
2373         return 0;
2374 }
2375
2376 static int dummy_bus_resume(struct usb_hcd *hcd)
2377 {
2378         struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd);
2379         int rc = 0;
2380
2381         dev_dbg(&hcd->self.root_hub->dev, "%s\n", __func__);
2382
2383         spin_lock_irq(&dum_hcd->dum->lock);
2384         if (!HCD_HW_ACCESSIBLE(hcd)) {
2385                 rc = -ESHUTDOWN;
2386         } else {
2387                 dum_hcd->rh_state = DUMMY_RH_RUNNING;
2388                 set_link_state(dum_hcd);
2389                 if (!list_empty(&dum_hcd->urbp_list))
2390                         mod_timer(&dum_hcd->timer, jiffies);
2391                 hcd->state = HC_STATE_RUNNING;
2392         }
2393         spin_unlock_irq(&dum_hcd->dum->lock);
2394         return rc;
2395 }
2396
2397 /*-------------------------------------------------------------------------*/
2398
2399 static inline ssize_t show_urb(char *buf, size_t size, struct urb *urb)
2400 {
2401         int ep = usb_pipeendpoint(urb->pipe);
2402
2403         return scnprintf(buf, size,
2404                 "urb/%p %s ep%d%s%s len %d/%d\n",
2405                 urb,
2406                 ({ char *s;
2407                 switch (urb->dev->speed) {
2408                 case USB_SPEED_LOW:
2409                         s = "ls";
2410                         break;
2411                 case USB_SPEED_FULL:
2412                         s = "fs";
2413                         break;
2414                 case USB_SPEED_HIGH:
2415                         s = "hs";
2416                         break;
2417                 case USB_SPEED_SUPER:
2418                         s = "ss";
2419                         break;
2420                 default:
2421                         s = "?";
2422                         break;
2423                  } s; }),
2424                 ep, ep ? (usb_urb_dir_in(urb) ? "in" : "out") : "",
2425                 ({ char *s; \
2426                 switch (usb_pipetype(urb->pipe)) { \
2427                 case PIPE_CONTROL: \
2428                         s = ""; \
2429                         break; \
2430                 case PIPE_BULK: \
2431                         s = "-bulk"; \
2432                         break; \
2433                 case PIPE_INTERRUPT: \
2434                         s = "-int"; \
2435                         break; \
2436                 default: \
2437                         s = "-iso"; \
2438                         break; \
2439                 } s; }),
2440                 urb->actual_length, urb->transfer_buffer_length);
2441 }
2442
2443 static ssize_t urbs_show(struct device *dev, struct device_attribute *attr,
2444                 char *buf)
2445 {
2446         struct usb_hcd          *hcd = dev_get_drvdata(dev);
2447         struct dummy_hcd        *dum_hcd = hcd_to_dummy_hcd(hcd);
2448         struct urbp             *urbp;
2449         size_t                  size = 0;
2450         unsigned long           flags;
2451
2452         spin_lock_irqsave(&dum_hcd->dum->lock, flags);
2453         list_for_each_entry(urbp, &dum_hcd->urbp_list, urbp_list) {
2454                 size_t          temp;
2455
2456                 temp = show_urb(buf, PAGE_SIZE - size, urbp->urb);
2457                 buf += temp;
2458                 size += temp;
2459         }
2460         spin_unlock_irqrestore(&dum_hcd->dum->lock, flags);
2461
2462         return size;
2463 }
2464 static DEVICE_ATTR_RO(urbs);
2465
2466 static int dummy_start_ss(struct dummy_hcd *dum_hcd)
2467 {
2468         timer_setup(&dum_hcd->timer, dummy_timer, 0);
2469         dum_hcd->rh_state = DUMMY_RH_RUNNING;
2470         dum_hcd->stream_en_ep = 0;
2471         INIT_LIST_HEAD(&dum_hcd->urbp_list);
2472         dummy_hcd_to_hcd(dum_hcd)->power_budget = POWER_BUDGET_3;
2473         dummy_hcd_to_hcd(dum_hcd)->state = HC_STATE_RUNNING;
2474         dummy_hcd_to_hcd(dum_hcd)->uses_new_polling = 1;
2475 #ifdef CONFIG_USB_OTG
2476         dummy_hcd_to_hcd(dum_hcd)->self.otg_port = 1;
2477 #endif
2478         return 0;
2479
2480         /* FIXME 'urbs' should be a per-device thing, maybe in usbcore */
2481         return device_create_file(dummy_dev(dum_hcd), &dev_attr_urbs);
2482 }
2483
2484 static int dummy_start(struct usb_hcd *hcd)
2485 {
2486         struct dummy_hcd        *dum_hcd = hcd_to_dummy_hcd(hcd);
2487
2488         /*
2489          * HOST side init ... we emulate a root hub that'll only ever
2490          * talk to one device (the gadget side).  Also appears in sysfs,
2491          * just like more familiar pci-based HCDs.
2492          */
2493         if (!usb_hcd_is_primary_hcd(hcd))
2494                 return dummy_start_ss(dum_hcd);
2495
2496         spin_lock_init(&dum_hcd->dum->lock);
2497         timer_setup(&dum_hcd->timer, dummy_timer, 0);
2498         dum_hcd->rh_state = DUMMY_RH_RUNNING;
2499
2500         INIT_LIST_HEAD(&dum_hcd->urbp_list);
2501
2502         hcd->power_budget = POWER_BUDGET;
2503         hcd->state = HC_STATE_RUNNING;
2504         hcd->uses_new_polling = 1;
2505
2506 #ifdef CONFIG_USB_OTG
2507         hcd->self.otg_port = 1;
2508 #endif
2509
2510         /* FIXME 'urbs' should be a per-device thing, maybe in usbcore */
2511         return device_create_file(dummy_dev(dum_hcd), &dev_attr_urbs);
2512 }
2513
2514 static void dummy_stop(struct usb_hcd *hcd)
2515 {
2516         device_remove_file(dummy_dev(hcd_to_dummy_hcd(hcd)), &dev_attr_urbs);
2517         dev_info(dummy_dev(hcd_to_dummy_hcd(hcd)), "stopped\n");
2518 }
2519
2520 /*-------------------------------------------------------------------------*/
2521
2522 static int dummy_h_get_frame(struct usb_hcd *hcd)
2523 {
2524         return dummy_g_get_frame(NULL);
2525 }
2526
2527 static int dummy_setup(struct usb_hcd *hcd)
2528 {
2529         struct dummy *dum;
2530
2531         dum = *((void **)dev_get_platdata(hcd->self.controller));
2532         hcd->self.sg_tablesize = ~0;
2533         if (usb_hcd_is_primary_hcd(hcd)) {
2534                 dum->hs_hcd = hcd_to_dummy_hcd(hcd);
2535                 dum->hs_hcd->dum = dum;
2536                 /*
2537                  * Mark the first roothub as being USB 2.0.
2538                  * The USB 3.0 roothub will be registered later by
2539                  * dummy_hcd_probe()
2540                  */
2541                 hcd->speed = HCD_USB2;
2542                 hcd->self.root_hub->speed = USB_SPEED_HIGH;
2543         } else {
2544                 dum->ss_hcd = hcd_to_dummy_hcd(hcd);
2545                 dum->ss_hcd->dum = dum;
2546                 hcd->speed = HCD_USB3;
2547                 hcd->self.root_hub->speed = USB_SPEED_SUPER;
2548         }
2549         return 0;
2550 }
2551
2552 /* Change a group of bulk endpoints to support multiple stream IDs */
2553 static int dummy_alloc_streams(struct usb_hcd *hcd, struct usb_device *udev,
2554         struct usb_host_endpoint **eps, unsigned int num_eps,
2555         unsigned int num_streams, gfp_t mem_flags)
2556 {
2557         struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd);
2558         unsigned long flags;
2559         int max_stream;
2560         int ret_streams = num_streams;
2561         unsigned int index;
2562         unsigned int i;
2563
2564         if (!num_eps)
2565                 return -EINVAL;
2566
2567         spin_lock_irqsave(&dum_hcd->dum->lock, flags);
2568         for (i = 0; i < num_eps; i++) {
2569                 index = dummy_get_ep_idx(&eps[i]->desc);
2570                 if ((1 << index) & dum_hcd->stream_en_ep) {
2571                         ret_streams = -EINVAL;
2572                         goto out;
2573                 }
2574                 max_stream = usb_ss_max_streams(&eps[i]->ss_ep_comp);
2575                 if (!max_stream) {
2576                         ret_streams = -EINVAL;
2577                         goto out;
2578                 }
2579                 if (max_stream < ret_streams) {
2580                         dev_dbg(dummy_dev(dum_hcd), "Ep 0x%x only supports %u "
2581                                         "stream IDs.\n",
2582                                         eps[i]->desc.bEndpointAddress,
2583                                         max_stream);
2584                         ret_streams = max_stream;
2585                 }
2586         }
2587
2588         for (i = 0; i < num_eps; i++) {
2589                 index = dummy_get_ep_idx(&eps[i]->desc);
2590                 dum_hcd->stream_en_ep |= 1 << index;
2591                 set_max_streams_for_pipe(dum_hcd,
2592                                 usb_endpoint_num(&eps[i]->desc), ret_streams);
2593         }
2594 out:
2595         spin_unlock_irqrestore(&dum_hcd->dum->lock, flags);
2596         return ret_streams;
2597 }
2598
2599 /* Reverts a group of bulk endpoints back to not using stream IDs. */
2600 static int dummy_free_streams(struct usb_hcd *hcd, struct usb_device *udev,
2601         struct usb_host_endpoint **eps, unsigned int num_eps,
2602         gfp_t mem_flags)
2603 {
2604         struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd);
2605         unsigned long flags;
2606         int ret;
2607         unsigned int index;
2608         unsigned int i;
2609
2610         spin_lock_irqsave(&dum_hcd->dum->lock, flags);
2611         for (i = 0; i < num_eps; i++) {
2612                 index = dummy_get_ep_idx(&eps[i]->desc);
2613                 if (!((1 << index) & dum_hcd->stream_en_ep)) {
2614                         ret = -EINVAL;
2615                         goto out;
2616                 }
2617         }
2618
2619         for (i = 0; i < num_eps; i++) {
2620                 index = dummy_get_ep_idx(&eps[i]->desc);
2621                 dum_hcd->stream_en_ep &= ~(1 << index);
2622                 set_max_streams_for_pipe(dum_hcd,
2623                                 usb_endpoint_num(&eps[i]->desc), 0);
2624         }
2625         ret = 0;
2626 out:
2627         spin_unlock_irqrestore(&dum_hcd->dum->lock, flags);
2628         return ret;
2629 }
2630
2631 static struct hc_driver dummy_hcd = {
2632         .description =          (char *) driver_name,
2633         .product_desc =         "Dummy host controller",
2634         .hcd_priv_size =        sizeof(struct dummy_hcd),
2635
2636         .reset =                dummy_setup,
2637         .start =                dummy_start,
2638         .stop =                 dummy_stop,
2639
2640         .urb_enqueue =          dummy_urb_enqueue,
2641         .urb_dequeue =          dummy_urb_dequeue,
2642
2643         .get_frame_number =     dummy_h_get_frame,
2644
2645         .hub_status_data =      dummy_hub_status,
2646         .hub_control =          dummy_hub_control,
2647         .bus_suspend =          dummy_bus_suspend,
2648         .bus_resume =           dummy_bus_resume,
2649
2650         .alloc_streams =        dummy_alloc_streams,
2651         .free_streams =         dummy_free_streams,
2652 };
2653
2654 static int dummy_hcd_probe(struct platform_device *pdev)
2655 {
2656         struct dummy            *dum;
2657         struct usb_hcd          *hs_hcd;
2658         struct usb_hcd          *ss_hcd;
2659         int                     retval;
2660
2661         dev_info(&pdev->dev, "%s, driver " DRIVER_VERSION "\n", driver_desc);
2662         dum = *((void **)dev_get_platdata(&pdev->dev));
2663
2664         if (mod_data.is_super_speed)
2665                 dummy_hcd.flags = HCD_USB3 | HCD_SHARED;
2666         else if (mod_data.is_high_speed)
2667                 dummy_hcd.flags = HCD_USB2;
2668         else
2669                 dummy_hcd.flags = HCD_USB11;
2670         hs_hcd = usb_create_hcd(&dummy_hcd, &pdev->dev, dev_name(&pdev->dev));
2671         if (!hs_hcd)
2672                 return -ENOMEM;
2673         hs_hcd->has_tt = 1;
2674
2675         retval = usb_add_hcd(hs_hcd, 0, 0);
2676         if (retval)
2677                 goto put_usb2_hcd;
2678
2679         if (mod_data.is_super_speed) {
2680                 ss_hcd = usb_create_shared_hcd(&dummy_hcd, &pdev->dev,
2681                                         dev_name(&pdev->dev), hs_hcd);
2682                 if (!ss_hcd) {
2683                         retval = -ENOMEM;
2684                         goto dealloc_usb2_hcd;
2685                 }
2686
2687                 retval = usb_add_hcd(ss_hcd, 0, 0);
2688                 if (retval)
2689                         goto put_usb3_hcd;
2690         }
2691         return 0;
2692
2693 put_usb3_hcd:
2694         usb_put_hcd(ss_hcd);
2695 dealloc_usb2_hcd:
2696         usb_remove_hcd(hs_hcd);
2697 put_usb2_hcd:
2698         usb_put_hcd(hs_hcd);
2699         dum->hs_hcd = dum->ss_hcd = NULL;
2700         return retval;
2701 }
2702
2703 static void dummy_hcd_remove(struct platform_device *pdev)
2704 {
2705         struct dummy            *dum;
2706
2707         dum = hcd_to_dummy_hcd(platform_get_drvdata(pdev))->dum;
2708
2709         if (dum->ss_hcd) {
2710                 usb_remove_hcd(dummy_hcd_to_hcd(dum->ss_hcd));
2711                 usb_put_hcd(dummy_hcd_to_hcd(dum->ss_hcd));
2712         }
2713
2714         usb_remove_hcd(dummy_hcd_to_hcd(dum->hs_hcd));
2715         usb_put_hcd(dummy_hcd_to_hcd(dum->hs_hcd));
2716
2717         dum->hs_hcd = NULL;
2718         dum->ss_hcd = NULL;
2719 }
2720
2721 static int dummy_hcd_suspend(struct platform_device *pdev, pm_message_t state)
2722 {
2723         struct usb_hcd          *hcd;
2724         struct dummy_hcd        *dum_hcd;
2725         int                     rc = 0;
2726
2727         dev_dbg(&pdev->dev, "%s\n", __func__);
2728
2729         hcd = platform_get_drvdata(pdev);
2730         dum_hcd = hcd_to_dummy_hcd(hcd);
2731         if (dum_hcd->rh_state == DUMMY_RH_RUNNING) {
2732                 dev_warn(&pdev->dev, "Root hub isn't suspended!\n");
2733                 rc = -EBUSY;
2734         } else
2735                 clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
2736         return rc;
2737 }
2738
2739 static int dummy_hcd_resume(struct platform_device *pdev)
2740 {
2741         struct usb_hcd          *hcd;
2742
2743         dev_dbg(&pdev->dev, "%s\n", __func__);
2744
2745         hcd = platform_get_drvdata(pdev);
2746         set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
2747         usb_hcd_poll_rh_status(hcd);
2748         return 0;
2749 }
2750
2751 static struct platform_driver dummy_hcd_driver = {
2752         .probe          = dummy_hcd_probe,
2753         .remove_new     = dummy_hcd_remove,
2754         .suspend        = dummy_hcd_suspend,
2755         .resume         = dummy_hcd_resume,
2756         .driver         = {
2757                 .name   = driver_name,
2758         },
2759 };
2760
2761 /*-------------------------------------------------------------------------*/
2762 #define MAX_NUM_UDC     32
2763 static struct platform_device *the_udc_pdev[MAX_NUM_UDC];
2764 static struct platform_device *the_hcd_pdev[MAX_NUM_UDC];
2765
2766 static int __init dummy_hcd_init(void)
2767 {
2768         int     retval = -ENOMEM;
2769         int     i;
2770         struct  dummy *dum[MAX_NUM_UDC] = {};
2771
2772         if (usb_disabled())
2773                 return -ENODEV;
2774
2775         if (!mod_data.is_high_speed && mod_data.is_super_speed)
2776                 return -EINVAL;
2777
2778         if (mod_data.num < 1 || mod_data.num > MAX_NUM_UDC) {
2779                 pr_err("Number of emulated UDC must be in range of 1...%d\n",
2780                                 MAX_NUM_UDC);
2781                 return -EINVAL;
2782         }
2783
2784         for (i = 0; i < mod_data.num; i++) {
2785                 the_hcd_pdev[i] = platform_device_alloc(driver_name, i);
2786                 if (!the_hcd_pdev[i]) {
2787                         i--;
2788                         while (i >= 0)
2789                                 platform_device_put(the_hcd_pdev[i--]);
2790                         return retval;
2791                 }
2792         }
2793         for (i = 0; i < mod_data.num; i++) {
2794                 the_udc_pdev[i] = platform_device_alloc(gadget_name, i);
2795                 if (!the_udc_pdev[i]) {
2796                         i--;
2797                         while (i >= 0)
2798                                 platform_device_put(the_udc_pdev[i--]);
2799                         goto err_alloc_udc;
2800                 }
2801         }
2802         for (i = 0; i < mod_data.num; i++) {
2803                 dum[i] = kzalloc(sizeof(struct dummy), GFP_KERNEL);
2804                 if (!dum[i]) {
2805                         retval = -ENOMEM;
2806                         goto err_add_pdata;
2807                 }
2808                 retval = platform_device_add_data(the_hcd_pdev[i], &dum[i],
2809                                 sizeof(void *));
2810                 if (retval)
2811                         goto err_add_pdata;
2812                 retval = platform_device_add_data(the_udc_pdev[i], &dum[i],
2813                                 sizeof(void *));
2814                 if (retval)
2815                         goto err_add_pdata;
2816         }
2817
2818         retval = platform_driver_register(&dummy_hcd_driver);
2819         if (retval < 0)
2820                 goto err_add_pdata;
2821         retval = platform_driver_register(&dummy_udc_driver);
2822         if (retval < 0)
2823                 goto err_register_udc_driver;
2824
2825         for (i = 0; i < mod_data.num; i++) {
2826                 retval = platform_device_add(the_hcd_pdev[i]);
2827                 if (retval < 0) {
2828                         i--;
2829                         while (i >= 0)
2830                                 platform_device_del(the_hcd_pdev[i--]);
2831                         goto err_add_hcd;
2832                 }
2833         }
2834         for (i = 0; i < mod_data.num; i++) {
2835                 if (!dum[i]->hs_hcd ||
2836                                 (!dum[i]->ss_hcd && mod_data.is_super_speed)) {
2837                         /*
2838                          * The hcd was added successfully but its probe
2839                          * function failed for some reason.
2840                          */
2841                         retval = -EINVAL;
2842                         goto err_add_udc;
2843                 }
2844         }
2845
2846         for (i = 0; i < mod_data.num; i++) {
2847                 retval = platform_device_add(the_udc_pdev[i]);
2848                 if (retval < 0) {
2849                         i--;
2850                         while (i >= 0)
2851                                 platform_device_del(the_udc_pdev[i--]);
2852                         goto err_add_udc;
2853                 }
2854         }
2855
2856         for (i = 0; i < mod_data.num; i++) {
2857                 if (!platform_get_drvdata(the_udc_pdev[i])) {
2858                         /*
2859                          * The udc was added successfully but its probe
2860                          * function failed for some reason.
2861                          */
2862                         retval = -EINVAL;
2863                         goto err_probe_udc;
2864                 }
2865         }
2866         return retval;
2867
2868 err_probe_udc:
2869         for (i = 0; i < mod_data.num; i++)
2870                 platform_device_del(the_udc_pdev[i]);
2871 err_add_udc:
2872         for (i = 0; i < mod_data.num; i++)
2873                 platform_device_del(the_hcd_pdev[i]);
2874 err_add_hcd:
2875         platform_driver_unregister(&dummy_udc_driver);
2876 err_register_udc_driver:
2877         platform_driver_unregister(&dummy_hcd_driver);
2878 err_add_pdata:
2879         for (i = 0; i < mod_data.num; i++)
2880                 kfree(dum[i]);
2881         for (i = 0; i < mod_data.num; i++)
2882                 platform_device_put(the_udc_pdev[i]);
2883 err_alloc_udc:
2884         for (i = 0; i < mod_data.num; i++)
2885                 platform_device_put(the_hcd_pdev[i]);
2886         return retval;
2887 }
2888 module_init(dummy_hcd_init);
2889
2890 static void __exit dummy_hcd_cleanup(void)
2891 {
2892         int i;
2893
2894         for (i = 0; i < mod_data.num; i++) {
2895                 struct dummy *dum;
2896
2897                 dum = *((void **)dev_get_platdata(&the_udc_pdev[i]->dev));
2898
2899                 platform_device_unregister(the_udc_pdev[i]);
2900                 platform_device_unregister(the_hcd_pdev[i]);
2901                 kfree(dum);
2902         }
2903         platform_driver_unregister(&dummy_udc_driver);
2904         platform_driver_unregister(&dummy_hcd_driver);
2905 }
2906 module_exit(dummy_hcd_cleanup);