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;
 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(req, &ep->queue, queue) {
 767                 if (&req->req == _req) {
 768                         list_del_init(&req->queue);
 769                         _req->status = -ECONNRESET;
 770                         retval = 0;
 771                         break;
 772                 }
 773         }
 774         spin_unlock(&dum->lock);
 775
 776         if (retval == 0) {
 777                 dev_dbg(udc_dev(dum),
 778                                 "dequeued req %p from %s, len %d buf %p\n",
 779                                 req, _ep->name, _req->length, _req->buf);
 780                 usb_gadget_giveback_request(_ep, _req);
 781         }
 782         local_irq_restore(flags);
 783         return retval;
 784 }
 785
 786 static int
 787 dummy_set_halt_and_wedge(struct usb_ep *_ep, int value, int wedged)
 788 {
 789         struct dummy_ep         *ep;
 790         struct dummy            *dum;
 791
 792         if (!_ep)
 793                 return -EINVAL;
 794         ep = usb_ep_to_dummy_ep(_ep);
 795         dum = ep_to_dummy(ep);
 796         if (!dum->driver)
 797                 return -ESHUTDOWN;
 798         if (!value)
 799                 ep->halted = ep->wedged = 0;
 800         else if (ep->desc && (ep->desc->bEndpointAddress & USB_DIR_IN) &&
 801                         !list_empty(&ep->queue))
 802                 return -EAGAIN;
 803         else {
 804                 ep->halted = 1;
 805                 if (wedged)
 806                         ep->wedged = 1;
 807         }
 808         /* FIXME clear emulated data toggle too */
 809         return 0;
 810 }
 811
 812 static int
 813 dummy_set_halt(struct usb_ep *_ep, int value)
 814 {
 815         return dummy_set_halt_and_wedge(_ep, value, 0);
 816 }
 817
 818 static int dummy_set_wedge(struct usb_ep *_ep)
 819 {
 820         if (!_ep || _ep->name == ep0name)
 821                 return -EINVAL;
 822         return dummy_set_halt_and_wedge(_ep, 1, 1);
 823 }
 824
 825 static const struct usb_ep_ops dummy_ep_ops = {
 826         .enable         = dummy_enable,
 827         .disable        = dummy_disable,
 828
 829         .alloc_request  = dummy_alloc_request,
 830         .free_request   = dummy_free_request,
 831
 832         .queue          = dummy_queue,
 833         .dequeue        = dummy_dequeue,
 834
 835         .set_halt       = dummy_set_halt,
 836         .set_wedge      = dummy_set_wedge,
 837 };
 838
 839 /*-------------------------------------------------------------------------*/
 840
 841 /* there are both host and device side versions of this call ... */
 842 static int dummy_g_get_frame(struct usb_gadget *_gadget)
 843 {
 844         struct timespec64 ts64;
 845
 846         ktime_get_ts64(&ts64);
 847         return ts64.tv_nsec / NSEC_PER_MSEC;
 848 }
 849
 850 static int dummy_wakeup(struct usb_gadget *_gadget)
 851 {
 852         struct dummy_hcd *dum_hcd;
 853
 854         dum_hcd = gadget_to_dummy_hcd(_gadget);
 855         if (!(dum_hcd->dum->devstatus & ((1 << USB_DEVICE_B_HNP_ENABLE)
 856                                 | (1 << USB_DEVICE_REMOTE_WAKEUP))))
 857                 return -EINVAL;
 858         if ((dum_hcd->port_status & USB_PORT_STAT_CONNECTION) == 0)
 859                 return -ENOLINK;
 860         if ((dum_hcd->port_status & USB_PORT_STAT_SUSPEND) == 0 &&
 861                          dum_hcd->rh_state != DUMMY_RH_SUSPENDED)
 862                 return -EIO;
 863
 864         /* FIXME: What if the root hub is suspended but the port isn't? */
 865
 866         /* hub notices our request, issues downstream resume, etc */
 867         dum_hcd->resuming = 1;
 868         dum_hcd->re_timeout = jiffies + msecs_to_jiffies(20);
 869         mod_timer(&dummy_hcd_to_hcd(dum_hcd)->rh_timer, dum_hcd->re_timeout);
 870         return 0;
 871 }
 872
 873 static int dummy_set_selfpowered(struct usb_gadget *_gadget, int value)
 874 {
 875         struct dummy    *dum;
 876
 877         _gadget->is_selfpowered = (value != 0);
 878         dum = gadget_to_dummy_hcd(_gadget)->dum;
 879         if (value)
 880                 dum->devstatus |= (1 << USB_DEVICE_SELF_POWERED);
 881         else
 882                 dum->devstatus &= ~(1 << USB_DEVICE_SELF_POWERED);
 883         return 0;
 884 }
 885
 886 static void dummy_udc_update_ep0(struct dummy *dum)
 887 {
 888         if (dum->gadget.speed == USB_SPEED_SUPER)
 889                 dum->ep[0].ep.maxpacket = 9;
 890         else
 891                 dum->ep[0].ep.maxpacket = 64;
 892 }
 893
 894 static int dummy_pullup(struct usb_gadget *_gadget, int value)
 895 {
 896         struct dummy_hcd *dum_hcd;
 897         struct dummy    *dum;
 898         unsigned long   flags;
 899
 900         dum = gadget_dev_to_dummy(&_gadget->dev);
 901         dum_hcd = gadget_to_dummy_hcd(_gadget);
 902
 903         spin_lock_irqsave(&dum->lock, flags);
 904         dum->pullup = (value != 0);
 905         set_link_state(dum_hcd);
 906         spin_unlock_irqrestore(&dum->lock, flags);
 907
 908         usb_hcd_poll_rh_status(dummy_hcd_to_hcd(dum_hcd));
 909         return 0;
 910 }
 911
 912 static void dummy_udc_set_speed(struct usb_gadget *_gadget,
 913                 enum usb_device_speed speed)
 914 {
 915         struct dummy    *dum;
 916
 917         dum = gadget_dev_to_dummy(&_gadget->dev);
 918         dum->gadget.speed = speed;
 919         dummy_udc_update_ep0(dum);
 920 }
 921
 922 static int dummy_udc_start(struct usb_gadget *g,
 923                 struct usb_gadget_driver *driver);
 924 static int dummy_udc_stop(struct usb_gadget *g);
 925
 926 static const struct usb_gadget_ops dummy_ops = {
 927         .get_frame      = dummy_g_get_frame,
 928         .wakeup         = dummy_wakeup,
 929         .set_selfpowered = dummy_set_selfpowered,
 930         .pullup         = dummy_pullup,
 931         .udc_start      = dummy_udc_start,
 932         .udc_stop       = dummy_udc_stop,
 933         .udc_set_speed  = dummy_udc_set_speed,
 934 };
 935
 936 /*-------------------------------------------------------------------------*/
 937
 938 /* "function" sysfs attribute */
 939 static ssize_t function_show(struct device *dev, struct device_attribute *attr,
 940                 char *buf)
 941 {
 942         struct dummy    *dum = gadget_dev_to_dummy(dev);
 943
 944         if (!dum->driver || !dum->driver->function)
 945                 return 0;
 946         return scnprintf(buf, PAGE_SIZE, "%s\n", dum->driver->function);
 947 }
 948 static DEVICE_ATTR_RO(function);
 949
 950 /*-------------------------------------------------------------------------*/
 951
 952 /*
 953  * Driver registration/unregistration.
 954  *
 955  * This is basically hardware-specific; there's usually only one real USB
 956  * device (not host) controller since that's how USB devices are intended
 957  * to work.  So most implementations of these api calls will rely on the
 958  * fact that only one driver will ever bind to the hardware.  But curious
 959  * hardware can be built with discrete components, so the gadget API doesn't
 960  * require that assumption.
 961  *
 962  * For this emulator, it might be convenient to create a usb device
 963  * for each driver that registers:  just add to a big root hub.
 964  */
 965
 966 static int dummy_udc_start(struct usb_gadget *g,
 967                 struct usb_gadget_driver *driver)
 968 {
 969         struct dummy_hcd        *dum_hcd = gadget_to_dummy_hcd(g);
 970         struct dummy            *dum = dum_hcd->dum;
 971
 972         switch (g->speed) {
 973         /* All the speeds we support */
 974         case USB_SPEED_LOW:
 975         case USB_SPEED_FULL:
 976         case USB_SPEED_HIGH:
 977         case USB_SPEED_SUPER:
 978                 break;
 979         default:
 980                 dev_err(dummy_dev(dum_hcd), "Unsupported driver max speed %d\n",
 981                                 driver->max_speed);
 982                 return -EINVAL;
 983         }
 984
 985         /*
 986          * DEVICE side init ... the layer above hardware, which
 987          * can't enumerate without help from the driver we're binding.
 988          */
 989
 990         spin_lock_irq(&dum->lock);
 991         dum->devstatus = 0;
 992         dum->driver = driver;
 993         dum->ints_enabled = 1;
 994         spin_unlock_irq(&dum->lock);
 995
 996         return 0;
 997 }
 998
 999 static int dummy_udc_stop(struct usb_gadget *g)
1000 {
1001         struct dummy_hcd        *dum_hcd = gadget_to_dummy_hcd(g);
1002         struct dummy            *dum = dum_hcd->dum;
1003
1004         spin_lock_irq(&dum->lock);
1005         dum->ints_enabled = 0;
1006         stop_activity(dum);
1007
1008         /* emulate synchronize_irq(): wait for callbacks to finish */
1009         while (dum->callback_usage > 0) {
1010                 spin_unlock_irq(&dum->lock);
1011                 usleep_range(1000, 2000);
1012                 spin_lock_irq(&dum->lock);
1013         }
1014
1015         dum->driver = NULL;
1016         spin_unlock_irq(&dum->lock);
1017
1018         return 0;
1019 }
1020
1021 #undef is_enabled
1022
1023 /* The gadget structure is stored inside the hcd structure and will be
1024  * released along with it. */
1025 static void init_dummy_udc_hw(struct dummy *dum)
1026 {
1027         int i;
1028
1029         INIT_LIST_HEAD(&dum->gadget.ep_list);
1030         for (i = 0; i < DUMMY_ENDPOINTS; i++) {
1031                 struct dummy_ep *ep = &dum->ep[i];
1032
1033                 if (!ep_info[i].name)
1034                         break;
1035                 ep->ep.name = ep_info[i].name;
1036                 ep->ep.caps = ep_info[i].caps;
1037                 ep->ep.ops = &dummy_ep_ops;
1038                 list_add_tail(&ep->ep.ep_list, &dum->gadget.ep_list);
1039                 ep->halted = ep->wedged = ep->already_seen =
1040                                 ep->setup_stage = 0;
1041                 usb_ep_set_maxpacket_limit(&ep->ep, ~0);
1042                 ep->ep.max_streams = 16;
1043                 ep->last_io = jiffies;
1044                 ep->gadget = &dum->gadget;
1045                 ep->desc = NULL;
1046                 INIT_LIST_HEAD(&ep->queue);
1047         }
1048
1049         dum->gadget.ep0 = &dum->ep[0].ep;
1050         list_del_init(&dum->ep[0].ep.ep_list);
1051         INIT_LIST_HEAD(&dum->fifo_req.queue);
1052
1053 #ifdef CONFIG_USB_OTG
1054         dum->gadget.is_otg = 1;
1055 #endif
1056 }
1057
1058 static int dummy_udc_probe(struct platform_device *pdev)
1059 {
1060         struct dummy    *dum;
1061         int             rc;
1062
1063         dum = *((void **)dev_get_platdata(&pdev->dev));
1064         /* Clear usb_gadget region for new registration to udc-core */
1065         memzero_explicit(&dum->gadget, sizeof(struct usb_gadget));
1066         dum->gadget.name = gadget_name;
1067         dum->gadget.ops = &dummy_ops;
1068         if (mod_data.is_super_speed)
1069                 dum->gadget.max_speed = USB_SPEED_SUPER;
1070         else if (mod_data.is_high_speed)
1071                 dum->gadget.max_speed = USB_SPEED_HIGH;
1072         else
1073                 dum->gadget.max_speed = USB_SPEED_FULL;
1074
1075         dum->gadget.dev.parent = &pdev->dev;
1076         init_dummy_udc_hw(dum);
1077
1078         rc = usb_add_gadget_udc(&pdev->dev, &dum->gadget);
1079         if (rc < 0)
1080                 goto err_udc;
1081
1082         rc = device_create_file(&dum->gadget.dev, &dev_attr_function);
1083         if (rc < 0)
1084                 goto err_dev;
1085         platform_set_drvdata(pdev, dum);
1086         return rc;
1087
1088 err_dev:
1089         usb_del_gadget_udc(&dum->gadget);
1090 err_udc:
1091         return rc;
1092 }
1093
1094 static int dummy_udc_remove(struct platform_device *pdev)
1095 {
1096         struct dummy    *dum = platform_get_drvdata(pdev);
1097
1098         device_remove_file(&dum->gadget.dev, &dev_attr_function);
1099         usb_del_gadget_udc(&dum->gadget);
1100         return 0;
1101 }
1102
1103 static void dummy_udc_pm(struct dummy *dum, struct dummy_hcd *dum_hcd,
1104                 int suspend)
1105 {
1106         spin_lock_irq(&dum->lock);
1107         dum->udc_suspended = suspend;
1108         set_link_state(dum_hcd);
1109         spin_unlock_irq(&dum->lock);
1110 }
1111
1112 static int dummy_udc_suspend(struct platform_device *pdev, pm_message_t state)
1113 {
1114         struct dummy            *dum = platform_get_drvdata(pdev);
1115         struct dummy_hcd        *dum_hcd = gadget_to_dummy_hcd(&dum->gadget);
1116
1117         dev_dbg(&pdev->dev, "%s\n", __func__);
1118         dummy_udc_pm(dum, dum_hcd, 1);
1119         usb_hcd_poll_rh_status(dummy_hcd_to_hcd(dum_hcd));
1120         return 0;
1121 }
1122
1123 static int dummy_udc_resume(struct platform_device *pdev)
1124 {
1125         struct dummy            *dum = platform_get_drvdata(pdev);
1126         struct dummy_hcd        *dum_hcd = gadget_to_dummy_hcd(&dum->gadget);
1127
1128         dev_dbg(&pdev->dev, "%s\n", __func__);
1129         dummy_udc_pm(dum, dum_hcd, 0);
1130         usb_hcd_poll_rh_status(dummy_hcd_to_hcd(dum_hcd));
1131         return 0;
1132 }
1133
1134 static struct platform_driver dummy_udc_driver = {
1135         .probe          = dummy_udc_probe,
1136         .remove         = dummy_udc_remove,
1137         .suspend        = dummy_udc_suspend,
1138         .resume         = dummy_udc_resume,
1139         .driver         = {
1140                 .name   = gadget_name,
1141         },
1142 };
1143
1144 /*-------------------------------------------------------------------------*/
1145
1146 static unsigned int dummy_get_ep_idx(const struct usb_endpoint_descriptor *desc)
1147 {
1148         unsigned int index;
1149
1150         index = usb_endpoint_num(desc) << 1;
1151         if (usb_endpoint_dir_in(desc))
1152                 index |= 1;
1153         return index;
1154 }
1155
1156 /* HOST SIDE DRIVER
1157  *
1158  * this uses the hcd framework to hook up to host side drivers.
1159  * its root hub will only have one device, otherwise it acts like
1160  * a normal host controller.
1161  *
1162  * when urbs are queued, they're just stuck on a list that we
1163  * scan in a timer callback.  that callback connects writes from
1164  * the host with reads from the device, and so on, based on the
1165  * usb 2.0 rules.
1166  */
1167
1168 static int dummy_ep_stream_en(struct dummy_hcd *dum_hcd, struct urb *urb)
1169 {
1170         const struct usb_endpoint_descriptor *desc = &urb->ep->desc;
1171         u32 index;
1172
1173         if (!usb_endpoint_xfer_bulk(desc))
1174                 return 0;
1175
1176         index = dummy_get_ep_idx(desc);
1177         return (1 << index) & dum_hcd->stream_en_ep;
1178 }
1179
1180 /*
1181  * The max stream number is saved as a nibble so for the 30 possible endpoints
1182  * we only 15 bytes of memory. Therefore we are limited to max 16 streams (0
1183  * means we use only 1 stream). The maximum according to the spec is 16bit so
1184  * if the 16 stream limit is about to go, the array size should be incremented
1185  * to 30 elements of type u16.
1186  */
1187 static int get_max_streams_for_pipe(struct dummy_hcd *dum_hcd,
1188                 unsigned int pipe)
1189 {
1190         int max_streams;
1191
1192         max_streams = dum_hcd->num_stream[usb_pipeendpoint(pipe)];
1193         if (usb_pipeout(pipe))
1194                 max_streams >>= 4;
1195         else
1196                 max_streams &= 0xf;
1197         max_streams++;
1198         return max_streams;
1199 }
1200
1201 static void set_max_streams_for_pipe(struct dummy_hcd *dum_hcd,
1202                 unsigned int pipe, unsigned int streams)
1203 {
1204         int max_streams;
1205
1206         streams--;
1207         max_streams = dum_hcd->num_stream[usb_pipeendpoint(pipe)];
1208         if (usb_pipeout(pipe)) {
1209                 streams <<= 4;
1210                 max_streams &= 0xf;
1211         } else {
1212                 max_streams &= 0xf0;
1213         }
1214         max_streams |= streams;
1215         dum_hcd->num_stream[usb_pipeendpoint(pipe)] = max_streams;
1216 }
1217
1218 static int dummy_validate_stream(struct dummy_hcd *dum_hcd, struct urb *urb)
1219 {
1220         unsigned int max_streams;
1221         int enabled;
1222
1223         enabled = dummy_ep_stream_en(dum_hcd, urb);
1224         if (!urb->stream_id) {
1225                 if (enabled)
1226                         return -EINVAL;
1227                 return 0;
1228         }
1229         if (!enabled)
1230                 return -EINVAL;
1231
1232         max_streams = get_max_streams_for_pipe(dum_hcd,
1233                         usb_pipeendpoint(urb->pipe));
1234         if (urb->stream_id > max_streams) {
1235                 dev_err(dummy_dev(dum_hcd), "Stream id %d is out of range.\n",
1236                                 urb->stream_id);
1237                 BUG();
1238                 return -EINVAL;
1239         }
1240         return 0;
1241 }
1242
1243 static int dummy_urb_enqueue(
1244         struct usb_hcd                  *hcd,
1245         struct urb                      *urb,
1246         gfp_t                           mem_flags
1247 ) {
1248         struct dummy_hcd *dum_hcd;
1249         struct urbp     *urbp;
1250         unsigned long   flags;
1251         int             rc;
1252
1253         urbp = kmalloc(sizeof *urbp, mem_flags);
1254         if (!urbp)
1255                 return -ENOMEM;
1256         urbp->urb = urb;
1257         urbp->miter_started = 0;
1258
1259         dum_hcd = hcd_to_dummy_hcd(hcd);
1260         spin_lock_irqsave(&dum_hcd->dum->lock, flags);
1261
1262         rc = dummy_validate_stream(dum_hcd, urb);
1263         if (rc) {
1264                 kfree(urbp);
1265                 goto done;
1266         }
1267
1268         rc = usb_hcd_link_urb_to_ep(hcd, urb);
1269         if (rc) {
1270                 kfree(urbp);
1271                 goto done;
1272         }
1273
1274         if (!dum_hcd->udev) {
1275                 dum_hcd->udev = urb->dev;
1276                 usb_get_dev(dum_hcd->udev);
1277         } else if (unlikely(dum_hcd->udev != urb->dev))
1278                 dev_err(dummy_dev(dum_hcd), "usb_device address has changed!\n");
1279
1280         list_add_tail(&urbp->urbp_list, &dum_hcd->urbp_list);
1281         urb->hcpriv = urbp;
1282         if (!dum_hcd->next_frame_urbp)
1283                 dum_hcd->next_frame_urbp = urbp;
1284         if (usb_pipetype(urb->pipe) == PIPE_CONTROL)
1285                 urb->error_count = 1;           /* mark as a new urb */
1286
1287         /* kick the scheduler, it'll do the rest */
1288         if (!timer_pending(&dum_hcd->timer))
1289                 mod_timer(&dum_hcd->timer, jiffies + 1);
1290
1291  done:
1292         spin_unlock_irqrestore(&dum_hcd->dum->lock, flags);
1293         return rc;
1294 }
1295
1296 static int dummy_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
1297 {
1298         struct dummy_hcd *dum_hcd;
1299         unsigned long   flags;
1300         int             rc;
1301
1302         /* giveback happens automatically in timer callback,
1303          * so make sure the callback happens */
1304         dum_hcd = hcd_to_dummy_hcd(hcd);
1305         spin_lock_irqsave(&dum_hcd->dum->lock, flags);
1306
1307         rc = usb_hcd_check_unlink_urb(hcd, urb, status);
1308         if (!rc && dum_hcd->rh_state != DUMMY_RH_RUNNING &&
1309                         !list_empty(&dum_hcd->urbp_list))
1310                 mod_timer(&dum_hcd->timer, jiffies);
1311
1312         spin_unlock_irqrestore(&dum_hcd->dum->lock, flags);
1313         return rc;
1314 }
1315
1316 static int dummy_perform_transfer(struct urb *urb, struct dummy_request *req,
1317                 u32 len)
1318 {
1319         void *ubuf, *rbuf;
1320         struct urbp *urbp = urb->hcpriv;
1321         int to_host;
1322         struct sg_mapping_iter *miter = &urbp->miter;
1323         u32 trans = 0;
1324         u32 this_sg;
1325         bool next_sg;
1326
1327         to_host = usb_urb_dir_in(urb);
1328         rbuf = req->req.buf + req->req.actual;
1329
1330         if (!urb->num_sgs) {
1331                 ubuf = urb->transfer_buffer + urb->actual_length;
1332                 if (to_host)
1333                         memcpy(ubuf, rbuf, len);
1334                 else
1335                         memcpy(rbuf, ubuf, len);
1336                 return len;
1337         }
1338
1339         if (!urbp->miter_started) {
1340                 u32 flags = SG_MITER_ATOMIC;
1341
1342                 if (to_host)
1343                         flags |= SG_MITER_TO_SG;
1344                 else
1345                         flags |= SG_MITER_FROM_SG;
1346
1347                 sg_miter_start(miter, urb->sg, urb->num_sgs, flags);
1348                 urbp->miter_started = 1;
1349         }
1350         next_sg = sg_miter_next(miter);
1351         if (next_sg == false) {
1352                 WARN_ON_ONCE(1);
1353                 return -EINVAL;
1354         }
1355         do {
1356                 ubuf = miter->addr;
1357                 this_sg = min_t(u32, len, miter->length);
1358                 miter->consumed = this_sg;
1359                 trans += this_sg;
1360
1361                 if (to_host)
1362                         memcpy(ubuf, rbuf, this_sg);
1363                 else
1364                         memcpy(rbuf, ubuf, this_sg);
1365                 len -= this_sg;
1366
1367                 if (!len)
1368                         break;
1369                 next_sg = sg_miter_next(miter);
1370                 if (next_sg == false) {
1371                         WARN_ON_ONCE(1);
1372                         return -EINVAL;
1373                 }
1374
1375                 rbuf += this_sg;
1376         } while (1);
1377
1378         sg_miter_stop(miter);
1379         return trans;
1380 }
1381
1382 /* transfer up to a frame's worth; caller must own lock */
1383 static int transfer(struct dummy_hcd *dum_hcd, struct urb *urb,
1384                 struct dummy_ep *ep, int limit, int *status)
1385 {
1386         struct dummy            *dum = dum_hcd->dum;
1387         struct dummy_request    *req;
1388         int                     sent = 0;
1389
1390 top:
1391         /* if there's no request queued, the device is NAKing; return */
1392         list_for_each_entry(req, &ep->queue, queue) {
1393                 unsigned        host_len, dev_len, len;
1394                 int             is_short, to_host;
1395                 int             rescan = 0;
1396
1397                 if (dummy_ep_stream_en(dum_hcd, urb)) {
1398                         if ((urb->stream_id != req->req.stream_id))
1399                                 continue;
1400                 }
1401
1402                 /* 1..N packets of ep->ep.maxpacket each ... the last one
1403                  * may be short (including zero length).
1404                  *
1405                  * writer can send a zlp explicitly (length 0) or implicitly
1406                  * (length mod maxpacket zero, and 'zero' flag); they always
1407                  * terminate reads.
1408                  */
1409                 host_len = urb->transfer_buffer_length - urb->actual_length;
1410                 dev_len = req->req.length - req->req.actual;
1411                 len = min(host_len, dev_len);
1412
1413                 /* FIXME update emulated data toggle too */
1414
1415                 to_host = usb_urb_dir_in(urb);
1416                 if (unlikely(len == 0))
1417                         is_short = 1;
1418                 else {
1419                         /* not enough bandwidth left? */
1420                         if (limit < ep->ep.maxpacket && limit < len)
1421                                 break;
1422                         len = min_t(unsigned, len, limit);
1423                         if (len == 0)
1424                                 break;
1425
1426                         /* send multiple of maxpacket first, then remainder */
1427                         if (len >= ep->ep.maxpacket) {
1428                                 is_short = 0;
1429                                 if (len % ep->ep.maxpacket)
1430                                         rescan = 1;
1431                                 len -= len % ep->ep.maxpacket;
1432                         } else {
1433                                 is_short = 1;
1434                         }
1435
1436                         len = dummy_perform_transfer(urb, req, len);
1437
1438                         ep->last_io = jiffies;
1439                         if ((int)len < 0) {
1440                                 req->req.status = len;
1441                         } else {
1442                                 limit -= len;
1443                                 sent += len;
1444                                 urb->actual_length += len;
1445                                 req->req.actual += len;
1446                         }
1447                 }
1448
1449                 /* short packets terminate, maybe with overflow/underflow.
1450                  * it's only really an error to write too much.
1451                  *
1452                  * partially filling a buffer optionally blocks queue advances
1453                  * (so completion handlers can clean up the queue) but we don't
1454                  * need to emulate such data-in-flight.
1455                  */
1456                 if (is_short) {
1457                         if (host_len == dev_len) {
1458                                 req->req.status = 0;
1459                                 *status = 0;
1460                         } else if (to_host) {
1461                                 req->req.status = 0;
1462                                 if (dev_len > host_len)
1463                                         *status = -EOVERFLOW;
1464                                 else
1465                                         *status = 0;
1466                         } else {
1467                                 *status = 0;
1468                                 if (host_len > dev_len)
1469                                         req->req.status = -EOVERFLOW;
1470                                 else
1471                                         req->req.status = 0;
1472                         }
1473
1474                 /*
1475                  * many requests terminate without a short packet.
1476                  * send a zlp if demanded by flags.
1477                  */
1478                 } else {
1479                         if (req->req.length == req->req.actual) {
1480                                 if (req->req.zero && to_host)
1481                                         rescan = 1;
1482                                 else
1483                                         req->req.status = 0;
1484                         }
1485                         if (urb->transfer_buffer_length == urb->actual_length) {
1486                                 if (urb->transfer_flags & URB_ZERO_PACKET &&
1487                                     !to_host)
1488                                         rescan = 1;
1489                                 else
1490                                         *status = 0;
1491                         }
1492                 }
1493
1494                 /* device side completion --> continuable */
1495                 if (req->req.status != -EINPROGRESS) {
1496                         list_del_init(&req->queue);
1497
1498                         spin_unlock(&dum->lock);
1499                         usb_gadget_giveback_request(&ep->ep, &req->req);
1500                         spin_lock(&dum->lock);
1501
1502                         /* requests might have been unlinked... */
1503                         rescan = 1;
1504                 }
1505
1506                 /* host side completion --> terminate */
1507                 if (*status != -EINPROGRESS)
1508                         break;
1509
1510                 /* rescan to continue with any other queued i/o */
1511                 if (rescan)
1512                         goto top;
1513         }
1514         return sent;
1515 }
1516
1517 static int periodic_bytes(struct dummy *dum, struct dummy_ep *ep)
1518 {
1519         int     limit = ep->ep.maxpacket;
1520
1521         if (dum->gadget.speed == USB_SPEED_HIGH) {
1522                 int     tmp;
1523
1524                 /* high bandwidth mode */
1525                 tmp = usb_endpoint_maxp_mult(ep->desc);
1526                 tmp *= 8 /* applies to entire frame */;
1527                 limit += limit * tmp;
1528         }
1529         if (dum->gadget.speed == USB_SPEED_SUPER) {
1530                 switch (usb_endpoint_type(ep->desc)) {
1531                 case USB_ENDPOINT_XFER_ISOC:
1532                         /* Sec. 4.4.8.2 USB3.0 Spec */
1533                         limit = 3 * 16 * 1024 * 8;
1534                         break;
1535                 case USB_ENDPOINT_XFER_INT:
1536                         /* Sec. 4.4.7.2 USB3.0 Spec */
1537                         limit = 3 * 1024 * 8;
1538                         break;
1539                 case USB_ENDPOINT_XFER_BULK:
1540                 default:
1541                         break;
1542                 }
1543         }
1544         return limit;
1545 }
1546
1547 #define is_active(dum_hcd)      ((dum_hcd->port_status & \
1548                 (USB_PORT_STAT_CONNECTION | USB_PORT_STAT_ENABLE | \
1549                         USB_PORT_STAT_SUSPEND)) \
1550                 == (USB_PORT_STAT_CONNECTION | USB_PORT_STAT_ENABLE))
1551
1552 static struct dummy_ep *find_endpoint(struct dummy *dum, u8 address)
1553 {
1554         int             i;
1555
1556         if (!is_active((dum->gadget.speed == USB_SPEED_SUPER ?
1557                         dum->ss_hcd : dum->hs_hcd)))
1558                 return NULL;
1559         if (!dum->ints_enabled)
1560                 return NULL;
1561         if ((address & ~USB_DIR_IN) == 0)
1562                 return &dum->ep[0];
1563         for (i = 1; i < DUMMY_ENDPOINTS; i++) {
1564                 struct dummy_ep *ep = &dum->ep[i];
1565
1566                 if (!ep->desc)
1567                         continue;
1568                 if (ep->desc->bEndpointAddress == address)
1569                         return ep;
1570         }
1571         return NULL;
1572 }
1573
1574 #undef is_active
1575
1576 #define Dev_Request     (USB_TYPE_STANDARD | USB_RECIP_DEVICE)
1577 #define Dev_InRequest   (Dev_Request | USB_DIR_IN)
1578 #define Intf_Request    (USB_TYPE_STANDARD | USB_RECIP_INTERFACE)
1579 #define Intf_InRequest  (Intf_Request | USB_DIR_IN)
1580 #define Ep_Request      (USB_TYPE_STANDARD | USB_RECIP_ENDPOINT)
1581 #define Ep_InRequest    (Ep_Request | USB_DIR_IN)
1582
1583
1584 /**
1585  * handle_control_request() - handles all control transfers
1586  * @dum_hcd: pointer to dummy (the_controller)
1587  * @urb: the urb request to handle
1588  * @setup: pointer to the setup data for a USB device control
1589  *       request
1590  * @status: pointer to request handling status
1591  *
1592  * Return 0 - if the request was handled
1593  *        1 - if the request wasn't handles
1594  *        error code on error
1595  */
1596 static int handle_control_request(struct dummy_hcd *dum_hcd, struct urb *urb,
1597                                   struct usb_ctrlrequest *setup,
1598                                   int *status)
1599 {
1600         struct dummy_ep         *ep2;
1601         struct dummy            *dum = dum_hcd->dum;
1602         int                     ret_val = 1;
1603         unsigned        w_index;
1604         unsigned        w_value;
1605
1606         w_index = le16_to_cpu(setup->wIndex);
1607         w_value = le16_to_cpu(setup->wValue);
1608         switch (setup->bRequest) {
1609         case USB_REQ_SET_ADDRESS:
1610                 if (setup->bRequestType != Dev_Request)
1611                         break;
1612                 dum->address = w_value;
1613                 *status = 0;
1614                 dev_dbg(udc_dev(dum), "set_address = %d\n",
1615                                 w_value);
1616                 ret_val = 0;
1617                 break;
1618         case USB_REQ_SET_FEATURE:
1619                 if (setup->bRequestType == Dev_Request) {
1620                         ret_val = 0;
1621                         switch (w_value) {
1622                         case USB_DEVICE_REMOTE_WAKEUP:
1623                                 break;
1624                         case USB_DEVICE_B_HNP_ENABLE:
1625                                 dum->gadget.b_hnp_enable = 1;
1626                                 break;
1627                         case USB_DEVICE_A_HNP_SUPPORT:
1628                                 dum->gadget.a_hnp_support = 1;
1629                                 break;
1630                         case USB_DEVICE_A_ALT_HNP_SUPPORT:
1631                                 dum->gadget.a_alt_hnp_support = 1;
1632                                 break;
1633                         case USB_DEVICE_U1_ENABLE:
1634                                 if (dummy_hcd_to_hcd(dum_hcd)->speed ==
1635                                     HCD_USB3)
1636                                         w_value = USB_DEV_STAT_U1_ENABLED;
1637                                 else
1638                                         ret_val = -EOPNOTSUPP;
1639                                 break;
1640                         case USB_DEVICE_U2_ENABLE:
1641                                 if (dummy_hcd_to_hcd(dum_hcd)->speed ==
1642                                     HCD_USB3)
1643                                         w_value = USB_DEV_STAT_U2_ENABLED;
1644                                 else
1645                                         ret_val = -EOPNOTSUPP;
1646                                 break;
1647                         case USB_DEVICE_LTM_ENABLE:
1648                                 if (dummy_hcd_to_hcd(dum_hcd)->speed ==
1649                                     HCD_USB3)
1650                                         w_value = USB_DEV_STAT_LTM_ENABLED;
1651                                 else
1652                                         ret_val = -EOPNOTSUPP;
1653                                 break;
1654                         default:
1655                                 ret_val = -EOPNOTSUPP;
1656                         }
1657                         if (ret_val == 0) {
1658                                 dum->devstatus |= (1 << w_value);
1659                                 *status = 0;
1660                         }
1661                 } else if (setup->bRequestType == Ep_Request) {
1662                         /* endpoint halt */
1663                         ep2 = find_endpoint(dum, w_index);
1664                         if (!ep2 || ep2->ep.name == ep0name) {
1665                                 ret_val = -EOPNOTSUPP;
1666                                 break;
1667                         }
1668                         ep2->halted = 1;
1669                         ret_val = 0;
1670                         *status = 0;
1671                 }
1672                 break;
1673         case USB_REQ_CLEAR_FEATURE:
1674                 if (setup->bRequestType == Dev_Request) {
1675                         ret_val = 0;
1676                         switch (w_value) {
1677                         case USB_DEVICE_REMOTE_WAKEUP:
1678                                 w_value = USB_DEVICE_REMOTE_WAKEUP;
1679                                 break;
1680                         case USB_DEVICE_U1_ENABLE:
1681                                 if (dummy_hcd_to_hcd(dum_hcd)->speed ==
1682                                     HCD_USB3)
1683                                         w_value = USB_DEV_STAT_U1_ENABLED;
1684                                 else
1685                                         ret_val = -EOPNOTSUPP;
1686                                 break;
1687                         case USB_DEVICE_U2_ENABLE:
1688                                 if (dummy_hcd_to_hcd(dum_hcd)->speed ==
1689                                     HCD_USB3)
1690                                         w_value = USB_DEV_STAT_U2_ENABLED;
1691                                 else
1692                                         ret_val = -EOPNOTSUPP;
1693                                 break;
1694                         case USB_DEVICE_LTM_ENABLE:
1695                                 if (dummy_hcd_to_hcd(dum_hcd)->speed ==
1696                                     HCD_USB3)
1697                                         w_value = USB_DEV_STAT_LTM_ENABLED;
1698                                 else
1699                                         ret_val = -EOPNOTSUPP;
1700                                 break;
1701                         default:
1702                                 ret_val = -EOPNOTSUPP;
1703                                 break;
1704                         }
1705                         if (ret_val == 0) {
1706                                 dum->devstatus &= ~(1 << w_value);
1707                                 *status = 0;
1708                         }
1709                 } else if (setup->bRequestType == Ep_Request) {
1710                         /* endpoint halt */
1711                         ep2 = find_endpoint(dum, w_index);
1712                         if (!ep2) {
1713                                 ret_val = -EOPNOTSUPP;
1714                                 break;
1715                         }
1716                         if (!ep2->wedged)
1717                                 ep2->halted = 0;
1718                         ret_val = 0;
1719                         *status = 0;
1720                 }
1721                 break;
1722         case USB_REQ_GET_STATUS:
1723                 if (setup->bRequestType == Dev_InRequest
1724                                 || setup->bRequestType == Intf_InRequest
1725                                 || setup->bRequestType == Ep_InRequest) {
1726                         char *buf;
1727                         /*
1728                          * device: remote wakeup, selfpowered
1729                          * interface: nothing
1730                          * endpoint: halt
1731                          */
1732                         buf = (char *)urb->transfer_buffer;
1733                         if (urb->transfer_buffer_length > 0) {
1734                                 if (setup->bRequestType == Ep_InRequest) {
1735                                         ep2 = find_endpoint(dum, w_index);
1736                                         if (!ep2) {
1737                                                 ret_val = -EOPNOTSUPP;
1738                                                 break;
1739                                         }
1740                                         buf[0] = ep2->halted;
1741                                 } else if (setup->bRequestType ==
1742                                            Dev_InRequest) {
1743                                         buf[0] = (u8)dum->devstatus;
1744                                 } else
1745                                         buf[0] = 0;
1746                         }
1747                         if (urb->transfer_buffer_length > 1)
1748                                 buf[1] = 0;
1749                         urb->actual_length = min_t(u32, 2,
1750                                 urb->transfer_buffer_length);
1751                         ret_val = 0;
1752                         *status = 0;
1753                 }
1754                 break;
1755         }
1756         return ret_val;
1757 }
1758
1759 /*
1760  * Drive both sides of the transfers; looks like irq handlers to both
1761  * drivers except that the callbacks are invoked from soft interrupt
1762  * context.
1763  */
1764 static void dummy_timer(struct timer_list *t)
1765 {
1766         struct dummy_hcd        *dum_hcd = from_timer(dum_hcd, t, timer);
1767         struct dummy            *dum = dum_hcd->dum;
1768         struct urbp             *urbp, *tmp;
1769         unsigned long           flags;
1770         int                     limit, total;
1771         int                     i;
1772
1773         /* simplistic model for one frame's bandwidth */
1774         /* FIXME: account for transaction and packet overhead */
1775         switch (dum->gadget.speed) {
1776         case USB_SPEED_LOW:
1777                 total = 8/*bytes*/ * 12/*packets*/;
1778                 break;
1779         case USB_SPEED_FULL:
1780                 total = 64/*bytes*/ * 19/*packets*/;
1781                 break;
1782         case USB_SPEED_HIGH:
1783                 total = 512/*bytes*/ * 13/*packets*/ * 8/*uframes*/;
1784                 break;
1785         case USB_SPEED_SUPER:
1786                 /* Bus speed is 500000 bytes/ms, so use a little less */
1787                 total = 490000;
1788                 break;
1789         default:        /* Can't happen */
1790                 dev_err(dummy_dev(dum_hcd), "bogus device speed\n");
1791                 total = 0;
1792                 break;
1793         }
1794
1795         /* FIXME if HZ != 1000 this will probably misbehave ... */
1796
1797         /* look at each urb queued by the host side driver */
1798         spin_lock_irqsave(&dum->lock, flags);
1799
1800         if (!dum_hcd->udev) {
1801                 dev_err(dummy_dev(dum_hcd),
1802                                 "timer fired with no URBs pending?\n");
1803                 spin_unlock_irqrestore(&dum->lock, flags);
1804                 return;
1805         }
1806         dum_hcd->next_frame_urbp = NULL;
1807
1808         for (i = 0; i < DUMMY_ENDPOINTS; i++) {
1809                 if (!ep_info[i].name)
1810                         break;
1811                 dum->ep[i].already_seen = 0;
1812         }
1813
1814 restart:
1815         list_for_each_entry_safe(urbp, tmp, &dum_hcd->urbp_list, urbp_list) {
1816                 struct urb              *urb;
1817                 struct dummy_request    *req;
1818                 u8                      address;
1819                 struct dummy_ep         *ep = NULL;
1820                 int                     status = -EINPROGRESS;
1821
1822                 /* stop when we reach URBs queued after the timer interrupt */
1823                 if (urbp == dum_hcd->next_frame_urbp)
1824                         break;
1825
1826                 urb = urbp->urb;
1827                 if (urb->unlinked)
1828                         goto return_urb;
1829                 else if (dum_hcd->rh_state != DUMMY_RH_RUNNING)
1830                         continue;
1831
1832                 /* Used up this frame's bandwidth? */
1833                 if (total <= 0)
1834                         continue;
1835
1836                 /* find the gadget's ep for this request (if configured) */
1837                 address = usb_pipeendpoint (urb->pipe);
1838                 if (usb_urb_dir_in(urb))
1839                         address |= USB_DIR_IN;
1840                 ep = find_endpoint(dum, address);
1841                 if (!ep) {
1842                         /* set_configuration() disagreement */
1843                         dev_dbg(dummy_dev(dum_hcd),
1844                                 "no ep configured for urb %p\n",
1845                                 urb);
1846                         status = -EPROTO;
1847                         goto return_urb;
1848                 }
1849
1850                 if (ep->already_seen)
1851                         continue;
1852                 ep->already_seen = 1;
1853                 if (ep == &dum->ep[0] && urb->error_count) {
1854                         ep->setup_stage = 1;    /* a new urb */
1855                         urb->error_count = 0;
1856                 }
1857                 if (ep->halted && !ep->setup_stage) {
1858                         /* NOTE: must not be iso! */
1859                         dev_dbg(dummy_dev(dum_hcd), "ep %s halted, urb %p\n",
1860                                         ep->ep.name, urb);
1861                         status = -EPIPE;
1862                         goto return_urb;
1863                 }
1864                 /* FIXME make sure both ends agree on maxpacket */
1865
1866                 /* handle control requests */
1867                 if (ep == &dum->ep[0] && ep->setup_stage) {
1868                         struct usb_ctrlrequest          setup;
1869                         int                             value = 1;
1870
1871                         setup = *(struct usb_ctrlrequest *) urb->setup_packet;
1872                         /* paranoia, in case of stale queued data */
1873                         list_for_each_entry(req, &ep->queue, queue) {
1874                                 list_del_init(&req->queue);
1875                                 req->req.status = -EOVERFLOW;
1876                                 dev_dbg(udc_dev(dum), "stale req = %p\n",
1877                                                 req);
1878
1879                                 spin_unlock(&dum->lock);
1880                                 usb_gadget_giveback_request(&ep->ep, &req->req);
1881                                 spin_lock(&dum->lock);
1882                                 ep->already_seen = 0;
1883                                 goto restart;
1884                         }
1885
1886                         /* gadget driver never sees set_address or operations
1887                          * on standard feature flags.  some hardware doesn't
1888                          * even expose them.
1889                          */
1890                         ep->last_io = jiffies;
1891                         ep->setup_stage = 0;
1892                         ep->halted = 0;
1893
1894                         value = handle_control_request(dum_hcd, urb, &setup,
1895                                                        &status);
1896
1897                         /* gadget driver handles all other requests.  block
1898                          * until setup() returns; no reentrancy issues etc.
1899                          */
1900                         if (value > 0) {
1901                                 ++dum->callback_usage;
1902                                 spin_unlock(&dum->lock);
1903                                 value = dum->driver->setup(&dum->gadget,
1904                                                 &setup);
1905                                 spin_lock(&dum->lock);
1906                                 --dum->callback_usage;
1907
1908                                 if (value >= 0) {
1909                                         /* no delays (max 64KB data stage) */
1910                                         limit = 64*1024;
1911                                         goto treat_control_like_bulk;
1912                                 }
1913                                 /* error, see below */
1914                         }
1915
1916                         if (value < 0) {
1917                                 if (value != -EOPNOTSUPP)
1918                                         dev_dbg(udc_dev(dum),
1919                                                 "setup --> %d\n",
1920                                                 value);
1921                                 status = -EPIPE;
1922                                 urb->actual_length = 0;
1923                         }
1924
1925                         goto return_urb;
1926                 }
1927
1928                 /* non-control requests */
1929                 limit = total;
1930                 switch (usb_pipetype(urb->pipe)) {
1931                 case PIPE_ISOCHRONOUS:
1932                         /*
1933                          * We don't support isochronous.  But if we did,
1934                          * here are some of the issues we'd have to face:
1935                          *
1936                          * Is it urb->interval since the last xfer?
1937                          * Use urb->iso_frame_desc[i].
1938                          * Complete whether or not ep has requests queued.
1939                          * Report random errors, to debug drivers.
1940                          */
1941                         limit = max(limit, periodic_bytes(dum, ep));
1942                         status = -EINVAL;       /* fail all xfers */
1943                         break;
1944
1945                 case PIPE_INTERRUPT:
1946                         /* FIXME is it urb->interval since the last xfer?
1947                          * this almost certainly polls too fast.
1948                          */
1949                         limit = max(limit, periodic_bytes(dum, ep));
1950                         fallthrough;
1951
1952                 default:
1953 treat_control_like_bulk:
1954                         ep->last_io = jiffies;
1955                         total -= transfer(dum_hcd, urb, ep, limit, &status);
1956                         break;
1957                 }
1958
1959                 /* incomplete transfer? */
1960                 if (status == -EINPROGRESS)
1961                         continue;
1962
1963 return_urb:
1964                 list_del(&urbp->urbp_list);
1965                 kfree(urbp);
1966                 if (ep)
1967                         ep->already_seen = ep->setup_stage = 0;
1968
1969                 usb_hcd_unlink_urb_from_ep(dummy_hcd_to_hcd(dum_hcd), urb);
1970                 spin_unlock(&dum->lock);
1971                 usb_hcd_giveback_urb(dummy_hcd_to_hcd(dum_hcd), urb, status);
1972                 spin_lock(&dum->lock);
1973
1974                 goto restart;
1975         }
1976
1977         if (list_empty(&dum_hcd->urbp_list)) {
1978                 usb_put_dev(dum_hcd->udev);
1979                 dum_hcd->udev = NULL;
1980         } else if (dum_hcd->rh_state == DUMMY_RH_RUNNING) {
1981                 /* want a 1 msec delay here */
1982                 mod_timer(&dum_hcd->timer, jiffies + msecs_to_jiffies(1));
1983         }
1984
1985         spin_unlock_irqrestore(&dum->lock, flags);
1986 }
1987
1988 /*-------------------------------------------------------------------------*/
1989
1990 #define PORT_C_MASK \
1991         ((USB_PORT_STAT_C_CONNECTION \
1992         | USB_PORT_STAT_C_ENABLE \
1993         | USB_PORT_STAT_C_SUSPEND \
1994         | USB_PORT_STAT_C_OVERCURRENT \
1995         | USB_PORT_STAT_C_RESET) << 16)
1996
1997 static int dummy_hub_status(struct usb_hcd *hcd, char *buf)
1998 {
1999         struct dummy_hcd        *dum_hcd;
2000         unsigned long           flags;
2001         int                     retval = 0;
2002
2003         dum_hcd = hcd_to_dummy_hcd(hcd);
2004
2005         spin_lock_irqsave(&dum_hcd->dum->lock, flags);
2006         if (!HCD_HW_ACCESSIBLE(hcd))
2007                 goto done;
2008
2009         if (dum_hcd->resuming && time_after_eq(jiffies, dum_hcd->re_timeout)) {
2010                 dum_hcd->port_status |= (USB_PORT_STAT_C_SUSPEND << 16);
2011                 dum_hcd->port_status &= ~USB_PORT_STAT_SUSPEND;
2012                 set_link_state(dum_hcd);
2013         }
2014
2015         if ((dum_hcd->port_status & PORT_C_MASK) != 0) {
2016                 *buf = (1 << 1);
2017                 dev_dbg(dummy_dev(dum_hcd), "port status 0x%08x has changes\n",
2018                                 dum_hcd->port_status);
2019                 retval = 1;
2020                 if (dum_hcd->rh_state == DUMMY_RH_SUSPENDED)
2021                         usb_hcd_resume_root_hub(hcd);
2022         }
2023 done:
2024         spin_unlock_irqrestore(&dum_hcd->dum->lock, flags);
2025         return retval;
2026 }
2027
2028 /* usb 3.0 root hub device descriptor */
2029 static struct {
2030         struct usb_bos_descriptor bos;
2031         struct usb_ss_cap_descriptor ss_cap;
2032 } __packed usb3_bos_desc = {
2033
2034         .bos = {
2035                 .bLength                = USB_DT_BOS_SIZE,
2036                 .bDescriptorType        = USB_DT_BOS,
2037                 .wTotalLength           = cpu_to_le16(sizeof(usb3_bos_desc)),
2038                 .bNumDeviceCaps         = 1,
2039         },
2040         .ss_cap = {
2041                 .bLength                = USB_DT_USB_SS_CAP_SIZE,
2042                 .bDescriptorType        = USB_DT_DEVICE_CAPABILITY,
2043                 .bDevCapabilityType     = USB_SS_CAP_TYPE,
2044                 .wSpeedSupported        = cpu_to_le16(USB_5GBPS_OPERATION),
2045                 .bFunctionalitySupport  = ilog2(USB_5GBPS_OPERATION),
2046         },
2047 };
2048
2049 static inline void
2050 ss_hub_descriptor(struct usb_hub_descriptor *desc)
2051 {
2052         memset(desc, 0, sizeof *desc);
2053         desc->bDescriptorType = USB_DT_SS_HUB;
2054         desc->bDescLength = 12;
2055         desc->wHubCharacteristics = cpu_to_le16(
2056                         HUB_CHAR_INDV_PORT_LPSM |
2057                         HUB_CHAR_COMMON_OCPM);
2058         desc->bNbrPorts = 1;
2059         desc->u.ss.bHubHdrDecLat = 0x04; /* Worst case: 0.4 micro sec*/
2060         desc->u.ss.DeviceRemovable = 0;
2061 }
2062
2063 static inline void hub_descriptor(struct usb_hub_descriptor *desc)
2064 {
2065         memset(desc, 0, sizeof *desc);
2066         desc->bDescriptorType = USB_DT_HUB;
2067         desc->bDescLength = 9;
2068         desc->wHubCharacteristics = cpu_to_le16(
2069                         HUB_CHAR_INDV_PORT_LPSM |
2070                         HUB_CHAR_COMMON_OCPM);
2071         desc->bNbrPorts = 1;
2072         desc->u.hs.DeviceRemovable[0] = 0;
2073         desc->u.hs.DeviceRemovable[1] = 0xff;   /* PortPwrCtrlMask */
2074 }
2075
2076 static int dummy_hub_control(
2077         struct usb_hcd  *hcd,
2078         u16             typeReq,
2079         u16             wValue,
2080         u16             wIndex,
2081         char            *buf,
2082         u16             wLength
2083 ) {
2084         struct dummy_hcd *dum_hcd;
2085         int             retval = 0;
2086         unsigned long   flags;
2087
2088         if (!HCD_HW_ACCESSIBLE(hcd))
2089                 return -ETIMEDOUT;
2090
2091         dum_hcd = hcd_to_dummy_hcd(hcd);
2092
2093         spin_lock_irqsave(&dum_hcd->dum->lock, flags);
2094         switch (typeReq) {
2095         case ClearHubFeature:
2096                 break;
2097         case ClearPortFeature:
2098                 switch (wValue) {
2099                 case USB_PORT_FEAT_SUSPEND:
2100                         if (hcd->speed == HCD_USB3) {
2101                                 dev_dbg(dummy_dev(dum_hcd),
2102                                          "USB_PORT_FEAT_SUSPEND req not "
2103                                          "supported for USB 3.0 roothub\n");
2104                                 goto error;
2105                         }
2106                         if (dum_hcd->port_status & USB_PORT_STAT_SUSPEND) {
2107                                 /* 20msec resume signaling */
2108                                 dum_hcd->resuming = 1;
2109                                 dum_hcd->re_timeout = jiffies +
2110                                                 msecs_to_jiffies(20);
2111                         }
2112                         break;
2113                 case USB_PORT_FEAT_POWER:
2114                         dev_dbg(dummy_dev(dum_hcd), "power-off\n");
2115                         if (hcd->speed == HCD_USB3)
2116                                 dum_hcd->port_status &= ~USB_SS_PORT_STAT_POWER;
2117                         else
2118                                 dum_hcd->port_status &= ~USB_PORT_STAT_POWER;
2119                         set_link_state(dum_hcd);
2120                         break;
2121                 case USB_PORT_FEAT_ENABLE:
2122                 case USB_PORT_FEAT_C_ENABLE:
2123                 case USB_PORT_FEAT_C_SUSPEND:
2124                         /* Not allowed for USB-3 */
2125                         if (hcd->speed == HCD_USB3)
2126                                 goto error;
2127                         fallthrough;
2128                 case USB_PORT_FEAT_C_CONNECTION:
2129                 case USB_PORT_FEAT_C_RESET:
2130                         dum_hcd->port_status &= ~(1 << wValue);
2131                         set_link_state(dum_hcd);
2132                         break;
2133                 default:
2134                 /* Disallow INDICATOR and C_OVER_CURRENT */
2135                         goto error;
2136                 }
2137                 break;
2138         case GetHubDescriptor:
2139                 if (hcd->speed == HCD_USB3 &&
2140                                 (wLength < USB_DT_SS_HUB_SIZE ||
2141                                  wValue != (USB_DT_SS_HUB << 8))) {
2142                         dev_dbg(dummy_dev(dum_hcd),
2143                                 "Wrong hub descriptor type for "
2144                                 "USB 3.0 roothub.\n");
2145                         goto error;
2146                 }
2147                 if (hcd->speed == HCD_USB3)
2148                         ss_hub_descriptor((struct usb_hub_descriptor *) buf);
2149                 else
2150                         hub_descriptor((struct usb_hub_descriptor *) buf);
2151                 break;
2152
2153         case DeviceRequest | USB_REQ_GET_DESCRIPTOR:
2154                 if (hcd->speed != HCD_USB3)
2155                         goto error;
2156
2157                 if ((wValue >> 8) != USB_DT_BOS)
2158                         goto error;
2159
2160                 memcpy(buf, &usb3_bos_desc, sizeof(usb3_bos_desc));
2161                 retval = sizeof(usb3_bos_desc);
2162                 break;
2163
2164         case GetHubStatus:
2165                 *(__le32 *) buf = cpu_to_le32(0);
2166                 break;
2167         case GetPortStatus:
2168                 if (wIndex != 1)
2169                         retval = -EPIPE;
2170
2171                 /* whoever resets or resumes must GetPortStatus to
2172                  * complete it!!
2173                  */
2174                 if (dum_hcd->resuming &&
2175                                 time_after_eq(jiffies, dum_hcd->re_timeout)) {
2176                         dum_hcd->port_status |= (USB_PORT_STAT_C_SUSPEND << 16);
2177                         dum_hcd->port_status &= ~USB_PORT_STAT_SUSPEND;
2178                 }
2179                 if ((dum_hcd->port_status & USB_PORT_STAT_RESET) != 0 &&
2180                                 time_after_eq(jiffies, dum_hcd->re_timeout)) {
2181                         dum_hcd->port_status |= (USB_PORT_STAT_C_RESET << 16);
2182                         dum_hcd->port_status &= ~USB_PORT_STAT_RESET;
2183                         if (dum_hcd->dum->pullup) {
2184                                 dum_hcd->port_status |= USB_PORT_STAT_ENABLE;
2185
2186                                 if (hcd->speed < HCD_USB3) {
2187                                         switch (dum_hcd->dum->gadget.speed) {
2188                                         case USB_SPEED_HIGH:
2189                                                 dum_hcd->port_status |=
2190                                                       USB_PORT_STAT_HIGH_SPEED;
2191                                                 break;
2192                                         case USB_SPEED_LOW:
2193                                                 dum_hcd->dum->gadget.ep0->
2194                                                         maxpacket = 8;
2195                                                 dum_hcd->port_status |=
2196                                                         USB_PORT_STAT_LOW_SPEED;
2197                                                 break;
2198                                         default:
2199                                                 break;
2200                                         }
2201                                 }
2202                         }
2203                 }
2204                 set_link_state(dum_hcd);
2205                 ((__le16 *) buf)[0] = cpu_to_le16(dum_hcd->port_status);
2206                 ((__le16 *) buf)[1] = cpu_to_le16(dum_hcd->port_status >> 16);
2207                 break;
2208         case SetHubFeature:
2209                 retval = -EPIPE;
2210                 break;
2211         case SetPortFeature:
2212                 switch (wValue) {
2213                 case USB_PORT_FEAT_LINK_STATE:
2214                         if (hcd->speed != HCD_USB3) {
2215                                 dev_dbg(dummy_dev(dum_hcd),
2216                                          "USB_PORT_FEAT_LINK_STATE req not "
2217                                          "supported for USB 2.0 roothub\n");
2218                                 goto error;
2219                         }
2220                         /*
2221                          * Since this is dummy we don't have an actual link so
2222                          * there is nothing to do for the SET_LINK_STATE cmd
2223                          */
2224                         break;
2225                 case USB_PORT_FEAT_U1_TIMEOUT:
2226                 case USB_PORT_FEAT_U2_TIMEOUT:
2227                         /* TODO: add suspend/resume support! */
2228                         if (hcd->speed != HCD_USB3) {
2229                                 dev_dbg(dummy_dev(dum_hcd),
2230                                          "USB_PORT_FEAT_U1/2_TIMEOUT req not "
2231                                          "supported for USB 2.0 roothub\n");
2232                                 goto error;
2233                         }
2234                         break;
2235                 case USB_PORT_FEAT_SUSPEND:
2236                         /* Applicable only for USB2.0 hub */
2237                         if (hcd->speed == HCD_USB3) {
2238                                 dev_dbg(dummy_dev(dum_hcd),
2239                                          "USB_PORT_FEAT_SUSPEND req not "
2240                                          "supported for USB 3.0 roothub\n");
2241                                 goto error;
2242                         }
2243                         if (dum_hcd->active) {
2244                                 dum_hcd->port_status |= USB_PORT_STAT_SUSPEND;
2245
2246                                 /* HNP would happen here; for now we
2247                                  * assume b_bus_req is always true.
2248                                  */
2249                                 set_link_state(dum_hcd);
2250                                 if (((1 << USB_DEVICE_B_HNP_ENABLE)
2251                                                 & dum_hcd->dum->devstatus) != 0)
2252                                         dev_dbg(dummy_dev(dum_hcd),
2253                                                         "no HNP yet!\n");
2254                         }
2255                         break;
2256                 case USB_PORT_FEAT_POWER:
2257                         if (hcd->speed == HCD_USB3)
2258                                 dum_hcd->port_status |= USB_SS_PORT_STAT_POWER;
2259                         else
2260                                 dum_hcd->port_status |= USB_PORT_STAT_POWER;
2261                         set_link_state(dum_hcd);
2262                         break;
2263                 case USB_PORT_FEAT_BH_PORT_RESET:
2264                         /* Applicable only for USB3.0 hub */
2265                         if (hcd->speed != HCD_USB3) {
2266                                 dev_dbg(dummy_dev(dum_hcd),
2267                                          "USB_PORT_FEAT_BH_PORT_RESET req not "
2268                                          "supported for USB 2.0 roothub\n");
2269                                 goto error;
2270                         }
2271                         fallthrough;
2272                 case USB_PORT_FEAT_RESET:
2273                         /* if it's already enabled, disable */
2274                         if (hcd->speed == HCD_USB3) {
2275                                 dum_hcd->port_status = 0;
2276                                 dum_hcd->port_status =
2277                                         (USB_SS_PORT_STAT_POWER |
2278                                          USB_PORT_STAT_CONNECTION |
2279                                          USB_PORT_STAT_RESET);
2280                         } else
2281                                 dum_hcd->port_status &= ~(USB_PORT_STAT_ENABLE
2282                                         | USB_PORT_STAT_LOW_SPEED
2283                                         | USB_PORT_STAT_HIGH_SPEED);
2284                         /*
2285                          * We want to reset device status. All but the
2286                          * Self powered feature
2287                          */
2288                         dum_hcd->dum->devstatus &=
2289                                 (1 << USB_DEVICE_SELF_POWERED);
2290                         /*
2291                          * FIXME USB3.0: what is the correct reset signaling
2292                          * interval? Is it still 50msec as for HS?
2293                          */
2294                         dum_hcd->re_timeout = jiffies + msecs_to_jiffies(50);
2295                         fallthrough;
2296                 case USB_PORT_FEAT_C_CONNECTION:
2297                 case USB_PORT_FEAT_C_RESET:
2298                 case USB_PORT_FEAT_C_ENABLE:
2299                 case USB_PORT_FEAT_C_SUSPEND:
2300                         /* Not allowed for USB-3, and ignored for USB-2 */
2301                         if (hcd->speed == HCD_USB3)
2302                                 goto error;
2303                         break;
2304                 default:
2305                 /* Disallow TEST, INDICATOR, and C_OVER_CURRENT */
2306                         goto error;
2307                 }
2308                 break;
2309         case GetPortErrorCount:
2310                 if (hcd->speed != HCD_USB3) {
2311                         dev_dbg(dummy_dev(dum_hcd),
2312                                  "GetPortErrorCount req not "
2313                                  "supported for USB 2.0 roothub\n");
2314                         goto error;
2315                 }
2316                 /* We'll always return 0 since this is a dummy hub */
2317                 *(__le32 *) buf = cpu_to_le32(0);
2318                 break;
2319         case SetHubDepth:
2320                 if (hcd->speed != HCD_USB3) {
2321                         dev_dbg(dummy_dev(dum_hcd),
2322                                  "SetHubDepth req not supported for "
2323                                  "USB 2.0 roothub\n");
2324                         goto error;
2325                 }
2326                 break;
2327         default:
2328                 dev_dbg(dummy_dev(dum_hcd),
2329                         "hub control req%04x v%04x i%04x l%d\n",
2330                         typeReq, wValue, wIndex, wLength);
2331 error:
2332                 /* "protocol stall" on error */
2333                 retval = -EPIPE;
2334         }
2335         spin_unlock_irqrestore(&dum_hcd->dum->lock, flags);
2336
2337         if ((dum_hcd->port_status & PORT_C_MASK) != 0)
2338                 usb_hcd_poll_rh_status(hcd);
2339         return retval;
2340 }
2341
2342 static int dummy_bus_suspend(struct usb_hcd *hcd)
2343 {
2344         struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd);
2345
2346         dev_dbg(&hcd->self.root_hub->dev, "%s\n", __func__);
2347
2348         spin_lock_irq(&dum_hcd->dum->lock);
2349         dum_hcd->rh_state = DUMMY_RH_SUSPENDED;
2350         set_link_state(dum_hcd);
2351         hcd->state = HC_STATE_SUSPENDED;
2352         spin_unlock_irq(&dum_hcd->dum->lock);
2353         return 0;
2354 }
2355
2356 static int dummy_bus_resume(struct usb_hcd *hcd)
2357 {
2358         struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd);
2359         int rc = 0;
2360
2361         dev_dbg(&hcd->self.root_hub->dev, "%s\n", __func__);
2362
2363         spin_lock_irq(&dum_hcd->dum->lock);
2364         if (!HCD_HW_ACCESSIBLE(hcd)) {
2365                 rc = -ESHUTDOWN;
2366         } else {
2367                 dum_hcd->rh_state = DUMMY_RH_RUNNING;
2368                 set_link_state(dum_hcd);
2369                 if (!list_empty(&dum_hcd->urbp_list))
2370                         mod_timer(&dum_hcd->timer, jiffies);
2371                 hcd->state = HC_STATE_RUNNING;
2372         }
2373         spin_unlock_irq(&dum_hcd->dum->lock);
2374         return rc;
2375 }
2376
2377 /*-------------------------------------------------------------------------*/
2378
2379 static inline ssize_t show_urb(char *buf, size_t size, struct urb *urb)
2380 {
2381         int ep = usb_pipeendpoint(urb->pipe);
2382
2383         return scnprintf(buf, size,
2384                 "urb/%p %s ep%d%s%s len %d/%d\n",
2385                 urb,
2386                 ({ char *s;
2387                 switch (urb->dev->speed) {
2388                 case USB_SPEED_LOW:
2389                         s = "ls";
2390                         break;
2391                 case USB_SPEED_FULL:
2392                         s = "fs";
2393                         break;
2394                 case USB_SPEED_HIGH:
2395                         s = "hs";
2396                         break;
2397                 case USB_SPEED_SUPER:
2398                         s = "ss";
2399                         break;
2400                 default:
2401                         s = "?";
2402                         break;
2403                  } s; }),
2404                 ep, ep ? (usb_urb_dir_in(urb) ? "in" : "out") : "",
2405                 ({ char *s; \
2406                 switch (usb_pipetype(urb->pipe)) { \
2407                 case PIPE_CONTROL: \
2408                         s = ""; \
2409                         break; \
2410                 case PIPE_BULK: \
2411                         s = "-bulk"; \
2412                         break; \
2413                 case PIPE_INTERRUPT: \
2414                         s = "-int"; \
2415                         break; \
2416                 default: \
2417                         s = "-iso"; \
2418                         break; \
2419                 } s; }),
2420                 urb->actual_length, urb->transfer_buffer_length);
2421 }
2422
2423 static ssize_t urbs_show(struct device *dev, struct device_attribute *attr,
2424                 char *buf)
2425 {
2426         struct usb_hcd          *hcd = dev_get_drvdata(dev);
2427         struct dummy_hcd        *dum_hcd = hcd_to_dummy_hcd(hcd);
2428         struct urbp             *urbp;
2429         size_t                  size = 0;
2430         unsigned long           flags;
2431
2432         spin_lock_irqsave(&dum_hcd->dum->lock, flags);
2433         list_for_each_entry(urbp, &dum_hcd->urbp_list, urbp_list) {
2434                 size_t          temp;
2435
2436                 temp = show_urb(buf, PAGE_SIZE - size, urbp->urb);
2437                 buf += temp;
2438                 size += temp;
2439         }
2440         spin_unlock_irqrestore(&dum_hcd->dum->lock, flags);
2441
2442         return size;
2443 }
2444 static DEVICE_ATTR_RO(urbs);
2445
2446 static int dummy_start_ss(struct dummy_hcd *dum_hcd)
2447 {
2448         timer_setup(&dum_hcd->timer, dummy_timer, 0);
2449         dum_hcd->rh_state = DUMMY_RH_RUNNING;
2450         dum_hcd->stream_en_ep = 0;
2451         INIT_LIST_HEAD(&dum_hcd->urbp_list);
2452         dummy_hcd_to_hcd(dum_hcd)->power_budget = POWER_BUDGET_3;
2453         dummy_hcd_to_hcd(dum_hcd)->state = HC_STATE_RUNNING;
2454         dummy_hcd_to_hcd(dum_hcd)->uses_new_polling = 1;
2455 #ifdef CONFIG_USB_OTG
2456         dummy_hcd_to_hcd(dum_hcd)->self.otg_port = 1;
2457 #endif
2458         return 0;
2459
2460         /* FIXME 'urbs' should be a per-device thing, maybe in usbcore */
2461         return device_create_file(dummy_dev(dum_hcd), &dev_attr_urbs);
2462 }
2463
2464 static int dummy_start(struct usb_hcd *hcd)
2465 {
2466         struct dummy_hcd        *dum_hcd = hcd_to_dummy_hcd(hcd);
2467
2468         /*
2469          * HOST side init ... we emulate a root hub that'll only ever
2470          * talk to one device (the gadget side).  Also appears in sysfs,
2471          * just like more familiar pci-based HCDs.
2472          */
2473         if (!usb_hcd_is_primary_hcd(hcd))
2474                 return dummy_start_ss(dum_hcd);
2475
2476         spin_lock_init(&dum_hcd->dum->lock);
2477         timer_setup(&dum_hcd->timer, dummy_timer, 0);
2478         dum_hcd->rh_state = DUMMY_RH_RUNNING;
2479
2480         INIT_LIST_HEAD(&dum_hcd->urbp_list);
2481
2482         hcd->power_budget = POWER_BUDGET;
2483         hcd->state = HC_STATE_RUNNING;
2484         hcd->uses_new_polling = 1;
2485
2486 #ifdef CONFIG_USB_OTG
2487         hcd->self.otg_port = 1;
2488 #endif
2489
2490         /* FIXME 'urbs' should be a per-device thing, maybe in usbcore */
2491         return device_create_file(dummy_dev(dum_hcd), &dev_attr_urbs);
2492 }
2493
2494 static void dummy_stop(struct usb_hcd *hcd)
2495 {
2496         device_remove_file(dummy_dev(hcd_to_dummy_hcd(hcd)), &dev_attr_urbs);
2497         dev_info(dummy_dev(hcd_to_dummy_hcd(hcd)), "stopped\n");
2498 }
2499
2500 /*-------------------------------------------------------------------------*/
2501
2502 static int dummy_h_get_frame(struct usb_hcd *hcd)
2503 {
2504         return dummy_g_get_frame(NULL);
2505 }
2506
2507 static int dummy_setup(struct usb_hcd *hcd)
2508 {
2509         struct dummy *dum;
2510
2511         dum = *((void **)dev_get_platdata(hcd->self.controller));
2512         hcd->self.sg_tablesize = ~0;
2513         if (usb_hcd_is_primary_hcd(hcd)) {
2514                 dum->hs_hcd = hcd_to_dummy_hcd(hcd);
2515                 dum->hs_hcd->dum = dum;
2516                 /*
2517                  * Mark the first roothub as being USB 2.0.
2518                  * The USB 3.0 roothub will be registered later by
2519                  * dummy_hcd_probe()
2520                  */
2521                 hcd->speed = HCD_USB2;
2522                 hcd->self.root_hub->speed = USB_SPEED_HIGH;
2523         } else {
2524                 dum->ss_hcd = hcd_to_dummy_hcd(hcd);
2525                 dum->ss_hcd->dum = dum;
2526                 hcd->speed = HCD_USB3;
2527                 hcd->self.root_hub->speed = USB_SPEED_SUPER;
2528         }
2529         return 0;
2530 }
2531
2532 /* Change a group of bulk endpoints to support multiple stream IDs */
2533 static int dummy_alloc_streams(struct usb_hcd *hcd, struct usb_device *udev,
2534         struct usb_host_endpoint **eps, unsigned int num_eps,
2535         unsigned int num_streams, gfp_t mem_flags)
2536 {
2537         struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd);
2538         unsigned long flags;
2539         int max_stream;
2540         int ret_streams = num_streams;
2541         unsigned int index;
2542         unsigned int i;
2543
2544         if (!num_eps)
2545                 return -EINVAL;
2546
2547         spin_lock_irqsave(&dum_hcd->dum->lock, flags);
2548         for (i = 0; i < num_eps; i++) {
2549                 index = dummy_get_ep_idx(&eps[i]->desc);
2550                 if ((1 << index) & dum_hcd->stream_en_ep) {
2551                         ret_streams = -EINVAL;
2552                         goto out;
2553                 }
2554                 max_stream = usb_ss_max_streams(&eps[i]->ss_ep_comp);
2555                 if (!max_stream) {
2556                         ret_streams = -EINVAL;
2557                         goto out;
2558                 }
2559                 if (max_stream < ret_streams) {
2560                         dev_dbg(dummy_dev(dum_hcd), "Ep 0x%x only supports %u "
2561                                         "stream IDs.\n",
2562                                         eps[i]->desc.bEndpointAddress,
2563                                         max_stream);
2564                         ret_streams = max_stream;
2565                 }
2566         }
2567
2568         for (i = 0; i < num_eps; i++) {
2569                 index = dummy_get_ep_idx(&eps[i]->desc);
2570                 dum_hcd->stream_en_ep |= 1 << index;
2571                 set_max_streams_for_pipe(dum_hcd,
2572                                 usb_endpoint_num(&eps[i]->desc), ret_streams);
2573         }
2574 out:
2575         spin_unlock_irqrestore(&dum_hcd->dum->lock, flags);
2576         return ret_streams;
2577 }
2578
2579 /* Reverts a group of bulk endpoints back to not using stream IDs. */
2580 static int dummy_free_streams(struct usb_hcd *hcd, struct usb_device *udev,
2581         struct usb_host_endpoint **eps, unsigned int num_eps,
2582         gfp_t mem_flags)
2583 {
2584         struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd);
2585         unsigned long flags;
2586         int ret;
2587         unsigned int index;
2588         unsigned int i;
2589
2590         spin_lock_irqsave(&dum_hcd->dum->lock, flags);
2591         for (i = 0; i < num_eps; i++) {
2592                 index = dummy_get_ep_idx(&eps[i]->desc);
2593                 if (!((1 << index) & dum_hcd->stream_en_ep)) {
2594                         ret = -EINVAL;
2595                         goto out;
2596                 }
2597         }
2598
2599         for (i = 0; i < num_eps; i++) {
2600                 index = dummy_get_ep_idx(&eps[i]->desc);
2601                 dum_hcd->stream_en_ep &= ~(1 << index);
2602                 set_max_streams_for_pipe(dum_hcd,
2603                                 usb_endpoint_num(&eps[i]->desc), 0);
2604         }
2605         ret = 0;
2606 out:
2607         spin_unlock_irqrestore(&dum_hcd->dum->lock, flags);
2608         return ret;
2609 }
2610
2611 static struct hc_driver dummy_hcd = {
2612         .description =          (char *) driver_name,
2613         .product_desc =         "Dummy host controller",
2614         .hcd_priv_size =        sizeof(struct dummy_hcd),
2615
2616         .reset =                dummy_setup,
2617         .start =                dummy_start,
2618         .stop =                 dummy_stop,
2619
2620         .urb_enqueue =          dummy_urb_enqueue,
2621         .urb_dequeue =          dummy_urb_dequeue,
2622
2623         .get_frame_number =     dummy_h_get_frame,
2624
2625         .hub_status_data =      dummy_hub_status,
2626         .hub_control =          dummy_hub_control,
2627         .bus_suspend =          dummy_bus_suspend,
2628         .bus_resume =           dummy_bus_resume,
2629
2630         .alloc_streams =        dummy_alloc_streams,
2631         .free_streams =         dummy_free_streams,
2632 };
2633
2634 static int dummy_hcd_probe(struct platform_device *pdev)
2635 {
2636         struct dummy            *dum;
2637         struct usb_hcd          *hs_hcd;
2638         struct usb_hcd          *ss_hcd;
2639         int                     retval;
2640
2641         dev_info(&pdev->dev, "%s, driver " DRIVER_VERSION "\n", driver_desc);
2642         dum = *((void **)dev_get_platdata(&pdev->dev));
2643
2644         if (mod_data.is_super_speed)
2645                 dummy_hcd.flags = HCD_USB3 | HCD_SHARED;
2646         else if (mod_data.is_high_speed)
2647                 dummy_hcd.flags = HCD_USB2;
2648         else
2649                 dummy_hcd.flags = HCD_USB11;
2650         hs_hcd = usb_create_hcd(&dummy_hcd, &pdev->dev, dev_name(&pdev->dev));
2651         if (!hs_hcd)
2652                 return -ENOMEM;
2653         hs_hcd->has_tt = 1;
2654
2655         retval = usb_add_hcd(hs_hcd, 0, 0);
2656         if (retval)
2657                 goto put_usb2_hcd;
2658
2659         if (mod_data.is_super_speed) {
2660                 ss_hcd = usb_create_shared_hcd(&dummy_hcd, &pdev->dev,
2661                                         dev_name(&pdev->dev), hs_hcd);
2662                 if (!ss_hcd) {
2663                         retval = -ENOMEM;
2664                         goto dealloc_usb2_hcd;
2665                 }
2666
2667                 retval = usb_add_hcd(ss_hcd, 0, 0);
2668                 if (retval)
2669                         goto put_usb3_hcd;
2670         }
2671         return 0;
2672
2673 put_usb3_hcd:
2674         usb_put_hcd(ss_hcd);
2675 dealloc_usb2_hcd:
2676         usb_remove_hcd(hs_hcd);
2677 put_usb2_hcd:
2678         usb_put_hcd(hs_hcd);
2679         dum->hs_hcd = dum->ss_hcd = NULL;
2680         return retval;
2681 }
2682
2683 static int dummy_hcd_remove(struct platform_device *pdev)
2684 {
2685         struct dummy            *dum;
2686
2687         dum = hcd_to_dummy_hcd(platform_get_drvdata(pdev))->dum;
2688
2689         if (dum->ss_hcd) {
2690                 usb_remove_hcd(dummy_hcd_to_hcd(dum->ss_hcd));
2691                 usb_put_hcd(dummy_hcd_to_hcd(dum->ss_hcd));
2692         }
2693
2694         usb_remove_hcd(dummy_hcd_to_hcd(dum->hs_hcd));
2695         usb_put_hcd(dummy_hcd_to_hcd(dum->hs_hcd));
2696
2697         dum->hs_hcd = NULL;
2698         dum->ss_hcd = NULL;
2699
2700         return 0;
2701 }
2702
2703 static int dummy_hcd_suspend(struct platform_device *pdev, pm_message_t state)
2704 {
2705         struct usb_hcd          *hcd;
2706         struct dummy_hcd        *dum_hcd;
2707         int                     rc = 0;
2708
2709         dev_dbg(&pdev->dev, "%s\n", __func__);
2710
2711         hcd = platform_get_drvdata(pdev);
2712         dum_hcd = hcd_to_dummy_hcd(hcd);
2713         if (dum_hcd->rh_state == DUMMY_RH_RUNNING) {
2714                 dev_warn(&pdev->dev, "Root hub isn't suspended!\n");
2715                 rc = -EBUSY;
2716         } else
2717                 clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
2718         return rc;
2719 }
2720
2721 static int dummy_hcd_resume(struct platform_device *pdev)
2722 {
2723         struct usb_hcd          *hcd;
2724
2725         dev_dbg(&pdev->dev, "%s\n", __func__);
2726
2727         hcd = platform_get_drvdata(pdev);
2728         set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
2729         usb_hcd_poll_rh_status(hcd);
2730         return 0;
2731 }
2732
2733 static struct platform_driver dummy_hcd_driver = {
2734         .probe          = dummy_hcd_probe,
2735         .remove         = dummy_hcd_remove,
2736         .suspend        = dummy_hcd_suspend,
2737         .resume         = dummy_hcd_resume,
2738         .driver         = {
2739                 .name   = driver_name,
2740         },
2741 };
2742
2743 /*-------------------------------------------------------------------------*/
2744 #define MAX_NUM_UDC     32
2745 static struct platform_device *the_udc_pdev[MAX_NUM_UDC];
2746 static struct platform_device *the_hcd_pdev[MAX_NUM_UDC];
2747
2748 static int __init init(void)
2749 {
2750         int     retval = -ENOMEM;
2751         int     i;
2752         struct  dummy *dum[MAX_NUM_UDC] = {};
2753
2754         if (usb_disabled())
2755                 return -ENODEV;
2756
2757         if (!mod_data.is_high_speed && mod_data.is_super_speed)
2758                 return -EINVAL;
2759
2760         if (mod_data.num < 1 || mod_data.num > MAX_NUM_UDC) {
2761                 pr_err("Number of emulated UDC must be in range of 1...%d\n",
2762                                 MAX_NUM_UDC);
2763                 return -EINVAL;
2764         }
2765
2766         for (i = 0; i < mod_data.num; i++) {
2767                 the_hcd_pdev[i] = platform_device_alloc(driver_name, i);
2768                 if (!the_hcd_pdev[i]) {
2769                         i--;
2770                         while (i >= 0)
2771                                 platform_device_put(the_hcd_pdev[i--]);
2772                         return retval;
2773                 }
2774         }
2775         for (i = 0; i < mod_data.num; i++) {
2776                 the_udc_pdev[i] = platform_device_alloc(gadget_name, i);
2777                 if (!the_udc_pdev[i]) {
2778                         i--;
2779                         while (i >= 0)
2780                                 platform_device_put(the_udc_pdev[i--]);
2781                         goto err_alloc_udc;
2782                 }
2783         }
2784         for (i = 0; i < mod_data.num; i++) {
2785                 dum[i] = kzalloc(sizeof(struct dummy), GFP_KERNEL);
2786                 if (!dum[i]) {
2787                         retval = -ENOMEM;
2788                         goto err_add_pdata;
2789                 }
2790                 retval = platform_device_add_data(the_hcd_pdev[i], &dum[i],
2791                                 sizeof(void *));
2792                 if (retval)
2793                         goto err_add_pdata;
2794                 retval = platform_device_add_data(the_udc_pdev[i], &dum[i],
2795                                 sizeof(void *));
2796                 if (retval)
2797                         goto err_add_pdata;
2798         }
2799
2800         retval = platform_driver_register(&dummy_hcd_driver);
2801         if (retval < 0)
2802                 goto err_add_pdata;
2803         retval = platform_driver_register(&dummy_udc_driver);
2804         if (retval < 0)
2805                 goto err_register_udc_driver;
2806
2807         for (i = 0; i < mod_data.num; i++) {
2808                 retval = platform_device_add(the_hcd_pdev[i]);
2809                 if (retval < 0) {
2810                         i--;
2811                         while (i >= 0)
2812                                 platform_device_del(the_hcd_pdev[i--]);
2813                         goto err_add_hcd;
2814                 }
2815         }
2816         for (i = 0; i < mod_data.num; i++) {
2817                 if (!dum[i]->hs_hcd ||
2818                                 (!dum[i]->ss_hcd && mod_data.is_super_speed)) {
2819                         /*
2820                          * The hcd was added successfully but its probe
2821                          * function failed for some reason.
2822                          */
2823                         retval = -EINVAL;
2824                         goto err_add_udc;
2825                 }
2826         }
2827
2828         for (i = 0; i < mod_data.num; i++) {
2829                 retval = platform_device_add(the_udc_pdev[i]);
2830                 if (retval < 0) {
2831                         i--;
2832                         while (i >= 0)
2833                                 platform_device_del(the_udc_pdev[i--]);
2834                         goto err_add_udc;
2835                 }
2836         }
2837
2838         for (i = 0; i < mod_data.num; i++) {
2839                 if (!platform_get_drvdata(the_udc_pdev[i])) {
2840                         /*
2841                          * The udc was added successfully but its probe
2842                          * function failed for some reason.
2843                          */
2844                         retval = -EINVAL;
2845                         goto err_probe_udc;
2846                 }
2847         }
2848         return retval;
2849
2850 err_probe_udc:
2851         for (i = 0; i < mod_data.num; i++)
2852                 platform_device_del(the_udc_pdev[i]);
2853 err_add_udc:
2854         for (i = 0; i < mod_data.num; i++)
2855                 platform_device_del(the_hcd_pdev[i]);
2856 err_add_hcd:
2857         platform_driver_unregister(&dummy_udc_driver);
2858 err_register_udc_driver:
2859         platform_driver_unregister(&dummy_hcd_driver);
2860 err_add_pdata:
2861         for (i = 0; i < mod_data.num; i++)
2862                 kfree(dum[i]);
2863         for (i = 0; i < mod_data.num; i++)
2864                 platform_device_put(the_udc_pdev[i]);
2865 err_alloc_udc:
2866         for (i = 0; i < mod_data.num; i++)
2867                 platform_device_put(the_hcd_pdev[i]);
2868         return retval;
2869 }
2870 module_init(init);
2871
2872 static void __exit cleanup(void)
2873 {
2874         int i;
2875
2876         for (i = 0; i < mod_data.num; i++) {
2877                 struct dummy *dum;
2878
2879                 dum = *((void **)dev_get_platdata(&the_udc_pdev[i]->dev));
2880
2881                 platform_device_unregister(the_udc_pdev[i]);
2882                 platform_device_unregister(the_hcd_pdev[i]);
2883                 kfree(dum);
2884         }
2885         platform_driver_unregister(&dummy_udc_driver);
2886         platform_driver_unregister(&dummy_hcd_driver);
2887 }
2888 module_exit(cleanup);