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dummy_hcd.c
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linux-6.19.14/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/string_choices.h> 32#include <linux/errno.h> 33#include <linux/init.h> 34#include <linux/hrtimer.h> 35#include <linux/list.h> 36#include <linux/interrupt.h> 37#include <linux/platform_device.h> 38#include <linux/usb.h> 39#include <linux/usb/gadget.h> 40#include <linux/usb/hcd.h> 41#include <linux/scatterlist.h> 42 43#include <asm/byteorder.h> 44#include <linux/io.h> 45#include <asm/irq.h> 46#include <linux/unaligned.h> 47 48#define DRIVER_DESC "USB Host+Gadget Emulator" 49#define DRIVER_VERSION "02 May 2005" 50 51#define POWER_BUDGET 500 /* in mA; use 8 for low-power port testing */ 52#define POWER_BUDGET_3 900 /* in mA */ 53 54#define DUMMY_TIMER_INT_NSECS 125000 /* 1 microframe */ 55 56static const char driver_name[] = "dummy_hcd"; 57static const char driver_desc[] = "USB Host+Gadget Emulator"; 58 59static const char gadget_name[] = "dummy_udc"; 60 61MODULE_DESCRIPTION(DRIVER_DESC); 62MODULE_AUTHOR("David Brownell"); 63MODULE_LICENSE("GPL"); 64 65struct dummy_hcd_module_parameters { 66 bool is_super_speed; 67 bool is_high_speed; 68 unsigned int num; 69}; 70 71static struct dummy_hcd_module_parameters mod_data = { 72 .is_super_speed = false, 73 .is_high_speed = true, 74 .num = 1, 75}; 76module_param_named(is_super_speed, mod_data.is_super_speed, bool, S_IRUGO); 77MODULE_PARM_DESC(is_super_speed, "true to simulate SuperSpeed connection"); 78module_param_named(is_high_speed, mod_data.is_high_speed, bool, S_IRUGO); 79MODULE_PARM_DESC(is_high_speed, "true to simulate HighSpeed connection"); 80module_param_named(num, mod_data.num, uint, S_IRUGO); 81MODULE_PARM_DESC(num, "number of emulated controllers"); 82/*-------------------------------------------------------------------------*/ 83 84/* gadget side driver data structures */ 85struct dummy_ep { 86 struct list_head queue; 87 unsigned long last_io; /* jiffies timestamp */ 88 struct usb_gadget *gadget; 89 const struct usb_endpoint_descriptor *desc; 90 struct usb_ep ep; 91 unsigned halted:1; 92 unsigned wedged:1; 93 unsigned already_seen:1; 94 unsigned setup_stage:1; 95 unsigned stream_en:1; 96}; 97 98struct dummy_request { 99 struct list_head queue; /* ep's requests */ 100 struct usb_request req; 101}; 102 103static inline struct dummy_ep *usb_ep_to_dummy_ep(struct usb_ep *_ep) 104{ 105 return container_of(_ep, struct dummy_ep, ep); 106} 107 108static inline struct dummy_request *usb_request_to_dummy_request 109 (struct usb_request *_req) 110{ 111 return container_of(_req, struct dummy_request, req); 112} 113 114/*-------------------------------------------------------------------------*/ 115 116/* 117 * Every device has ep0 for control requests, plus up to 30 more endpoints, 118 * in one of two types: 119 * 120 * - Configurable: direction (in/out), type (bulk, iso, etc), and endpoint 121 * number can be changed. Names like "ep-a" are used for this type. 122 * 123 * - Fixed Function: in other cases. some characteristics may be mutable; 124 * that'd be hardware-specific. Names like "ep12out-bulk" are used. 125 * 126 * Gadget drivers are responsible for not setting up conflicting endpoint 127 * configurations, illegal or unsupported packet lengths, and so on. 128 */ 129 130static const char ep0name[] = "ep0"; 131 132static const struct { 133 const char *name; 134 const struct usb_ep_caps caps; 135} ep_info[] = { 136#define EP_INFO(_name, _caps) \ 137 { \ 138 .name = _name, \ 139 .caps = _caps, \ 140 } 141 142/* we don't provide isochronous endpoints since we don't support them */ 143#define TYPE_BULK_OR_INT (USB_EP_CAPS_TYPE_BULK | USB_EP_CAPS_TYPE_INT) 144 145 /* everyone has ep0 */ 146 EP_INFO(ep0name, 147 USB_EP_CAPS(USB_EP_CAPS_TYPE_CONTROL, USB_EP_CAPS_DIR_ALL)), 148 /* act like a pxa250: fifteen fixed function endpoints */ 149 EP_INFO("ep1in-bulk", 150 USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, USB_EP_CAPS_DIR_IN)), 151 EP_INFO("ep2out-bulk", 152 USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, USB_EP_CAPS_DIR_OUT)), 153/* 154 EP_INFO("ep3in-iso", 155 USB_EP_CAPS(USB_EP_CAPS_TYPE_ISO, USB_EP_CAPS_DIR_IN)), 156 EP_INFO("ep4out-iso", 157 USB_EP_CAPS(USB_EP_CAPS_TYPE_ISO, USB_EP_CAPS_DIR_OUT)), 158*/ 159 EP_INFO("ep5in-int", 160 USB_EP_CAPS(USB_EP_CAPS_TYPE_INT, USB_EP_CAPS_DIR_IN)), 161 EP_INFO("ep6in-bulk", 162 USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, USB_EP_CAPS_DIR_IN)), 163 EP_INFO("ep7out-bulk", 164 USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, USB_EP_CAPS_DIR_OUT)), 165/* 166 EP_INFO("ep8in-iso", 167 USB_EP_CAPS(USB_EP_CAPS_TYPE_ISO, USB_EP_CAPS_DIR_IN)), 168 EP_INFO("ep9out-iso", 169 USB_EP_CAPS(USB_EP_CAPS_TYPE_ISO, USB_EP_CAPS_DIR_OUT)), 170*/ 171 EP_INFO("ep10in-int", 172 USB_EP_CAPS(USB_EP_CAPS_TYPE_INT, USB_EP_CAPS_DIR_IN)), 173 EP_INFO("ep11in-bulk", 174 USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, USB_EP_CAPS_DIR_IN)), 175 EP_INFO("ep12out-bulk", 176 USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, USB_EP_CAPS_DIR_OUT)), 177/* 178 EP_INFO("ep13in-iso", 179 USB_EP_CAPS(USB_EP_CAPS_TYPE_ISO, USB_EP_CAPS_DIR_IN)), 180 EP_INFO("ep14out-iso", 181 USB_EP_CAPS(USB_EP_CAPS_TYPE_ISO, USB_EP_CAPS_DIR_OUT)), 182*/ 183 EP_INFO("ep15in-int", 184 USB_EP_CAPS(USB_EP_CAPS_TYPE_INT, USB_EP_CAPS_DIR_IN)), 185 186 /* or like sa1100: two fixed function endpoints */ 187 EP_INFO("ep1out-bulk", 188 USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, USB_EP_CAPS_DIR_OUT)), 189 EP_INFO("ep2in-bulk", 190 USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, USB_EP_CAPS_DIR_IN)), 191 192 /* and now some generic EPs so we have enough in multi config */ 193 EP_INFO("ep-aout", 194 USB_EP_CAPS(TYPE_BULK_OR_INT, USB_EP_CAPS_DIR_OUT)), 195 EP_INFO("ep-bin", 196 USB_EP_CAPS(TYPE_BULK_OR_INT, USB_EP_CAPS_DIR_IN)), 197 EP_INFO("ep-cout", 198 USB_EP_CAPS(TYPE_BULK_OR_INT, USB_EP_CAPS_DIR_OUT)), 199 EP_INFO("ep-dout", 200 USB_EP_CAPS(TYPE_BULK_OR_INT, USB_EP_CAPS_DIR_OUT)), 201 EP_INFO("ep-ein", 202 USB_EP_CAPS(TYPE_BULK_OR_INT, USB_EP_CAPS_DIR_IN)), 203 EP_INFO("ep-fout", 204 USB_EP_CAPS(TYPE_BULK_OR_INT, USB_EP_CAPS_DIR_OUT)), 205 EP_INFO("ep-gin", 206 USB_EP_CAPS(TYPE_BULK_OR_INT, USB_EP_CAPS_DIR_IN)), 207 EP_INFO("ep-hout", 208 USB_EP_CAPS(TYPE_BULK_OR_INT, USB_EP_CAPS_DIR_OUT)), 209 EP_INFO("ep-iout", 210 USB_EP_CAPS(TYPE_BULK_OR_INT, USB_EP_CAPS_DIR_OUT)), 211 EP_INFO("ep-jin", 212 USB_EP_CAPS(TYPE_BULK_OR_INT, USB_EP_CAPS_DIR_IN)), 213 EP_INFO("ep-kout", 214 USB_EP_CAPS(TYPE_BULK_OR_INT, USB_EP_CAPS_DIR_OUT)), 215 EP_INFO("ep-lin", 216 USB_EP_CAPS(TYPE_BULK_OR_INT, USB_EP_CAPS_DIR_IN)), 217 EP_INFO("ep-mout", 218 USB_EP_CAPS(TYPE_BULK_OR_INT, USB_EP_CAPS_DIR_OUT)), 219 220#undef EP_INFO 221}; 222 223#define DUMMY_ENDPOINTS ARRAY_SIZE(ep_info) 224 225/*-------------------------------------------------------------------------*/ 226 227#define FIFO_SIZE 64 228 229struct urbp { 230 struct urb *urb; 231 struct list_head urbp_list; 232 struct sg_mapping_iter miter; 233 u32 miter_started; 234}; 235 236 237enum dummy_rh_state { 238 DUMMY_RH_RESET, 239 DUMMY_RH_SUSPENDED, 240 DUMMY_RH_RUNNING 241}; 242 243struct dummy_hcd { 244 struct dummy *dum; 245 enum dummy_rh_state rh_state; 246 struct hrtimer timer; 247 u32 port_status; 248 u32 old_status; 249 unsigned long re_timeout; 250 251 struct usb_device *udev; 252 struct list_head urbp_list; 253 struct urbp *next_frame_urbp; 254 255 u32 stream_en_ep; 256 u8 num_stream[30 / 2]; 257 258 unsigned timer_pending:1; 259 unsigned active:1; 260 unsigned old_active:1; 261 unsigned resuming:1; 262}; 263 264struct dummy { 265 spinlock_t lock; 266 267 /* 268 * DEVICE/GADGET side support 269 */ 270 struct dummy_ep ep[DUMMY_ENDPOINTS]; 271 int address; 272 int callback_usage; 273 struct usb_gadget gadget; 274 struct usb_gadget_driver *driver; 275 struct dummy_request fifo_req; 276 u8 fifo_buf[FIFO_SIZE]; 277 u16 devstatus; 278 unsigned ints_enabled:1; 279 unsigned udc_suspended:1; 280 unsigned pullup:1; 281 282 /* 283 * HOST side support 284 */ 285 struct dummy_hcd *hs_hcd; 286 struct dummy_hcd *ss_hcd; 287}; 288 289static inline struct dummy_hcd *hcd_to_dummy_hcd(struct usb_hcd *hcd) 290{ 291 return (struct dummy_hcd *) (hcd->hcd_priv); 292} 293 294static inline struct usb_hcd *dummy_hcd_to_hcd(struct dummy_hcd *dum) 295{ 296 return container_of((void *) dum, struct usb_hcd, hcd_priv); 297} 298 299static inline struct device *dummy_dev(struct dummy_hcd *dum) 300{ 301 return dummy_hcd_to_hcd(dum)->self.controller; 302} 303 304static inline struct device *udc_dev(struct dummy *dum) 305{ 306 return dum->gadget.dev.parent; 307} 308 309static inline struct dummy *ep_to_dummy(struct dummy_ep *ep) 310{ 311 return container_of(ep->gadget, struct dummy, gadget); 312} 313 314static inline struct dummy_hcd *gadget_to_dummy_hcd(struct usb_gadget *gadget) 315{ 316 struct dummy *dum = container_of(gadget, struct dummy, gadget); 317 if (dum->gadget.speed == USB_SPEED_SUPER) 318 return dum->ss_hcd; 319 else 320 return dum->hs_hcd; 321} 322 323static inline struct dummy *gadget_dev_to_dummy(struct device *dev) 324{ 325 return container_of(dev, struct dummy, gadget.dev); 326} 327 328/*-------------------------------------------------------------------------*/ 329 330/* DEVICE/GADGET SIDE UTILITY ROUTINES */ 331 332/* called with spinlock held */ 333static void nuke(struct dummy *dum, struct dummy_ep *ep) 334{ 335 while (!list_empty(&ep->queue)) { 336 struct dummy_request *req; 337 338 req = list_entry(ep->queue.next, struct dummy_request, queue); 339 list_del_init(&req->queue); 340 req->req.status = -ESHUTDOWN; 341 342 spin_unlock(&dum->lock); 343 usb_gadget_giveback_request(&ep->ep, &req->req); 344 spin_lock(&dum->lock); 345 } 346} 347 348/* caller must hold lock */ 349static void stop_activity(struct dummy *dum) 350{ 351 int i; 352 353 /* prevent any more requests */ 354 dum->address = 0; 355 356 /* The timer is left running so that outstanding URBs can fail */ 357 358 /* nuke any pending requests first, so driver i/o is quiesced */ 359 for (i = 0; i < DUMMY_ENDPOINTS; ++i) 360 nuke(dum, &dum->ep[i]); 361 362 /* driver now does any non-usb quiescing necessary */ 363} 364 365/** 366 * set_link_state_by_speed() - Sets the current state of the link according to 367 * the hcd speed 368 * @dum_hcd: pointer to the dummy_hcd structure to update the link state for 369 * 370 * This function updates the port_status according to the link state and the 371 * speed of the hcd. 372 */ 373static void set_link_state_by_speed(struct dummy_hcd *dum_hcd) 374{ 375 struct dummy *dum = dum_hcd->dum; 376 377 if (dummy_hcd_to_hcd(dum_hcd)->speed == HCD_USB3) { 378 if ((dum_hcd->port_status & USB_SS_PORT_STAT_POWER) == 0) { 379 dum_hcd->port_status = 0; 380 } else if (!dum->pullup || dum->udc_suspended) { 381 /* UDC suspend must cause a disconnect */ 382 dum_hcd->port_status &= ~(USB_PORT_STAT_CONNECTION | 383 USB_PORT_STAT_ENABLE); 384 if ((dum_hcd->old_status & 385 USB_PORT_STAT_CONNECTION) != 0) 386 dum_hcd->port_status |= 387 (USB_PORT_STAT_C_CONNECTION << 16); 388 } else { 389 /* device is connected and not suspended */ 390 dum_hcd->port_status |= (USB_PORT_STAT_CONNECTION | 391 USB_PORT_STAT_SPEED_5GBPS) ; 392 if ((dum_hcd->old_status & 393 USB_PORT_STAT_CONNECTION) == 0) 394 dum_hcd->port_status |= 395 (USB_PORT_STAT_C_CONNECTION << 16); 396 if ((dum_hcd->port_status & USB_PORT_STAT_ENABLE) && 397 (dum_hcd->port_status & 398 USB_PORT_STAT_LINK_STATE) == USB_SS_PORT_LS_U0 && 399 dum_hcd->rh_state != DUMMY_RH_SUSPENDED) 400 dum_hcd->active = 1; 401 } 402 } else { 403 if ((dum_hcd->port_status & USB_PORT_STAT_POWER) == 0) { 404 dum_hcd->port_status = 0; 405 } else if (!dum->pullup || dum->udc_suspended) { 406 /* UDC suspend must cause a disconnect */ 407 dum_hcd->port_status &= ~(USB_PORT_STAT_CONNECTION | 408 USB_PORT_STAT_ENABLE | 409 USB_PORT_STAT_LOW_SPEED | 410 USB_PORT_STAT_HIGH_SPEED | 411 USB_PORT_STAT_SUSPEND); 412 if ((dum_hcd->old_status & 413 USB_PORT_STAT_CONNECTION) != 0) 414 dum_hcd->port_status |= 415 (USB_PORT_STAT_C_CONNECTION << 16); 416 } else { 417 dum_hcd->port_status |= USB_PORT_STAT_CONNECTION; 418 if ((dum_hcd->old_status & 419 USB_PORT_STAT_CONNECTION) == 0) 420 dum_hcd->port_status |= 421 (USB_PORT_STAT_C_CONNECTION << 16); 422 if ((dum_hcd->port_status & USB_PORT_STAT_ENABLE) == 0) 423 dum_hcd->port_status &= ~USB_PORT_STAT_SUSPEND; 424 else if ((dum_hcd->port_status & 425 USB_PORT_STAT_SUSPEND) == 0 && 426 dum_hcd->rh_state != DUMMY_RH_SUSPENDED) 427 dum_hcd->active = 1; 428 } 429 } 430} 431 432/* caller must hold lock */ 433static void set_link_state(struct dummy_hcd *dum_hcd) 434 __must_hold(&dum->lock) 435{ 436 struct dummy *dum = dum_hcd->dum; 437 unsigned int power_bit; 438 439 dum_hcd->active = 0; 440 if (dum->pullup) 441 if ((dummy_hcd_to_hcd(dum_hcd)->speed == HCD_USB3 && 442 dum->gadget.speed != USB_SPEED_SUPER) || 443 (dummy_hcd_to_hcd(dum_hcd)->speed != HCD_USB3 && 444 dum->gadget.speed == USB_SPEED_SUPER)) 445 return; 446 447 set_link_state_by_speed(dum_hcd); 448 power_bit = (dummy_hcd_to_hcd(dum_hcd)->speed == HCD_USB3 ? 449 USB_SS_PORT_STAT_POWER : USB_PORT_STAT_POWER); 450 451 if ((dum_hcd->port_status & USB_PORT_STAT_ENABLE) == 0 || 452 dum_hcd->active) 453 dum_hcd->resuming = 0; 454 455 /* Currently !connected or in reset */ 456 if ((dum_hcd->port_status & power_bit) == 0 || 457 (dum_hcd->port_status & USB_PORT_STAT_RESET) != 0) { 458 unsigned int disconnect = power_bit & 459 dum_hcd->old_status & (~dum_hcd->port_status); 460 unsigned int reset = USB_PORT_STAT_RESET & 461 (~dum_hcd->old_status) & dum_hcd->port_status; 462 463 /* Report reset and disconnect events to the driver */ 464 if (dum->ints_enabled && (disconnect || reset)) { 465 ++dum->callback_usage; 466 /* 467 * stop_activity() can drop dum->lock, so it must 468 * not come between the dum->ints_enabled test 469 * and the ++dum->callback_usage. 470 */ 471 stop_activity(dum); 472 spin_unlock(&dum->lock); 473 if (reset) 474 usb_gadget_udc_reset(&dum->gadget, dum->driver); 475 else 476 dum->driver->disconnect(&dum->gadget); 477 spin_lock(&dum->lock); 478 --dum->callback_usage; 479 } 480 } else if (dum_hcd->active != dum_hcd->old_active && 481 dum->ints_enabled) { 482 ++dum->callback_usage; 483 spin_unlock(&dum->lock); 484 if (dum_hcd->old_active && dum->driver->suspend) 485 dum->driver->suspend(&dum->gadget); 486 else if (!dum_hcd->old_active && dum->driver->resume) 487 dum->driver->resume(&dum->gadget); 488 spin_lock(&dum->lock); 489 --dum->callback_usage; 490 } 491 492 dum_hcd->old_status = dum_hcd->port_status; 493 dum_hcd->old_active = dum_hcd->active; 494} 495 496/*-------------------------------------------------------------------------*/ 497 498/* DEVICE/GADGET SIDE DRIVER 499 * 500 * This only tracks gadget state. All the work is done when the host 501 * side tries some (emulated) i/o operation. Real device controller 502 * drivers would do real i/o using dma, fifos, irqs, timers, etc. 503 */ 504 505#define is_enabled(dum) \ 506 (dum->port_status & USB_PORT_STAT_ENABLE) 507 508static int dummy_enable(struct usb_ep *_ep, 509 const struct usb_endpoint_descriptor *desc) 510{ 511 struct dummy *dum; 512 struct dummy_hcd *dum_hcd; 513 struct dummy_ep *ep; 514 unsigned max; 515 int retval; 516 517 ep = usb_ep_to_dummy_ep(_ep); 518 if (!_ep || !desc || ep->desc || _ep->name == ep0name 519 || desc->bDescriptorType != USB_DT_ENDPOINT) 520 return -EINVAL; 521 dum = ep_to_dummy(ep); 522 if (!dum->driver) 523 return -ESHUTDOWN; 524 525 dum_hcd = gadget_to_dummy_hcd(&dum->gadget); 526 if (!is_enabled(dum_hcd)) 527 return -ESHUTDOWN; 528 529 /* 530 * For HS/FS devices only bits 0..10 of the wMaxPacketSize represent the 531 * maximum packet size. 532 * For SS devices the wMaxPacketSize is limited by 1024. 533 */ 534 max = usb_endpoint_maxp(desc); 535 536 /* drivers must not request bad settings, since lower levels 537 * (hardware or its drivers) may not check. some endpoints 538 * can't do iso, many have maxpacket limitations, etc. 539 * 540 * since this "hardware" driver is here to help debugging, we 541 * have some extra sanity checks. (there could be more though, 542 * especially for "ep9out" style fixed function ones.) 543 */ 544 retval = -EINVAL; 545 switch (usb_endpoint_type(desc)) { 546 case USB_ENDPOINT_XFER_BULK: 547 if (strstr(ep->ep.name, "-iso") 548 || strstr(ep->ep.name, "-int")) { 549 goto done; 550 } 551 switch (dum->gadget.speed) { 552 case USB_SPEED_SUPER: 553 if (max == 1024) 554 break; 555 goto done; 556 case USB_SPEED_HIGH: 557 if (max == 512) 558 break; 559 goto done; 560 case USB_SPEED_FULL: 561 if (max == 8 || max == 16 || max == 32 || max == 64) 562 /* we'll fake any legal size */ 563 break; 564 /* save a return statement */ 565 fallthrough; 566 default: 567 goto done; 568 } 569 break; 570 case USB_ENDPOINT_XFER_INT: 571 if (strstr(ep->ep.name, "-iso")) /* bulk is ok */ 572 goto done; 573 /* real hardware might not handle all packet sizes */ 574 switch (dum->gadget.speed) { 575 case USB_SPEED_SUPER: 576 case USB_SPEED_HIGH: 577 if (max <= 1024) 578 break; 579 /* save a return statement */ 580 fallthrough; 581 case USB_SPEED_FULL: 582 if (max <= 64) 583 break; 584 /* save a return statement */ 585 fallthrough; 586 default: 587 if (max <= 8) 588 break; 589 goto done; 590 } 591 break; 592 case USB_ENDPOINT_XFER_ISOC: 593 if (strstr(ep->ep.name, "-bulk") 594 || strstr(ep->ep.name, "-int")) 595 goto done; 596 /* real hardware might not handle all packet sizes */ 597 switch (dum->gadget.speed) { 598 case USB_SPEED_SUPER: 599 case USB_SPEED_HIGH: 600 if (max <= 1024) 601 break; 602 /* save a return statement */ 603 fallthrough; 604 case USB_SPEED_FULL: 605 if (max <= 1023) 606 break; 607 /* save a return statement */ 608 fallthrough; 609 default: 610 goto done; 611 } 612 break; 613 default: 614 /* few chips support control except on ep0 */ 615 goto done; 616 } 617 618 _ep->maxpacket = max; 619 if (usb_ss_max_streams(_ep->comp_desc)) { 620 if (!usb_endpoint_xfer_bulk(desc)) { 621 dev_err(udc_dev(dum), "Can't enable stream support on " 622 "non-bulk ep %s\n", _ep->name); 623 return -EINVAL; 624 } 625 ep->stream_en = 1; 626 } 627 ep->desc = desc; 628 629 dev_dbg(udc_dev(dum), "enabled %s (ep%d%s-%s) maxpacket %d stream %s\n", 630 _ep->name, 631 usb_endpoint_num(desc), 632 (desc->bEndpointAddress & USB_DIR_IN) ? "in" : "out", 633 usb_ep_type_string(usb_endpoint_type(desc)), 634 max, str_enabled_disabled(ep->stream_en)); 635 636 /* at this point real hardware should be NAKing transfers 637 * to that endpoint, until a buffer is queued to it. 638 */ 639 ep->halted = ep->wedged = 0; 640 retval = 0; 641done: 642 return retval; 643} 644 645static int dummy_disable(struct usb_ep *_ep) 646{ 647 struct dummy_ep *ep; 648 struct dummy *dum; 649 unsigned long flags; 650 651 ep = usb_ep_to_dummy_ep(_ep); 652 if (!_ep || !ep->desc || _ep->name == ep0name) 653 return -EINVAL; 654 dum = ep_to_dummy(ep); 655 656 spin_lock_irqsave(&dum->lock, flags); 657 ep->desc = NULL; 658 ep->stream_en = 0; 659 nuke(dum, ep); 660 spin_unlock_irqrestore(&dum->lock, flags); 661 662 dev_dbg(udc_dev(dum), "disabled %s\n", _ep->name); 663 return 0; 664} 665 666static struct usb_request *dummy_alloc_request(struct usb_ep *_ep, 667 gfp_t mem_flags) 668{ 669 struct dummy_request *req; 670 671 if (!_ep) 672 return NULL; 673 674 req = kzalloc(sizeof(*req), mem_flags); 675 if (!req) 676 return NULL; 677 INIT_LIST_HEAD(&req->queue); 678 return &req->req; 679} 680 681static void dummy_free_request(struct usb_ep *_ep, struct usb_request *_req) 682{ 683 struct dummy_request *req; 684 685 if (!_ep || !_req) { 686 WARN_ON(1); 687 return; 688 } 689 690 req = usb_request_to_dummy_request(_req); 691 WARN_ON(!list_empty(&req->queue)); 692 kfree(req); 693} 694 695static void fifo_complete(struct usb_ep *ep, struct usb_request *req) 696{ 697} 698 699static int dummy_queue(struct usb_ep *_ep, struct usb_request *_req, 700 gfp_t mem_flags) 701{ 702 struct dummy_ep *ep; 703 struct dummy_request *req; 704 struct dummy *dum; 705 struct dummy_hcd *dum_hcd; 706 unsigned long flags; 707 708 req = usb_request_to_dummy_request(_req); 709 if (!_req || !list_empty(&req->queue) || !_req->complete) 710 return -EINVAL; 711 712 ep = usb_ep_to_dummy_ep(_ep); 713 if (!_ep || (!ep->desc && _ep->name != ep0name)) 714 return -EINVAL; 715 716 dum = ep_to_dummy(ep); 717 dum_hcd = gadget_to_dummy_hcd(&dum->gadget); 718 if (!dum->driver || !is_enabled(dum_hcd)) 719 return -ESHUTDOWN; 720 721#if 0 722 dev_dbg(udc_dev(dum), "ep %p queue req %p to %s, len %d buf %p\n", 723 ep, _req, _ep->name, _req->length, _req->buf); 724#endif 725 _req->status = -EINPROGRESS; 726 _req->actual = 0; 727 spin_lock_irqsave(&dum->lock, flags); 728 729 /* implement an emulated single-request FIFO */ 730 if (ep->desc && (ep->desc->bEndpointAddress & USB_DIR_IN) && 731 list_empty(&dum->fifo_req.queue) && 732 list_empty(&ep->queue) && 733 _req->length <= FIFO_SIZE) { 734 req = &dum->fifo_req; 735 req->req = *_req; 736 req->req.buf = dum->fifo_buf; 737 memcpy(dum->fifo_buf, _req->buf, _req->length); 738 req->req.context = dum; 739 req->req.complete = fifo_complete; 740 741 list_add_tail(&req->queue, &ep->queue); 742 spin_unlock(&dum->lock); 743 _req->actual = _req->length; 744 _req->status = 0; 745 usb_gadget_giveback_request(_ep, _req); 746 spin_lock(&dum->lock); 747 } else 748 list_add_tail(&req->queue, &ep->queue); 749 spin_unlock_irqrestore(&dum->lock, flags); 750 751 /* real hardware would likely enable transfers here, in case 752 * it'd been left NAKing. 753 */ 754 return 0; 755} 756 757static int dummy_dequeue(struct usb_ep *_ep, struct usb_request *_req) 758{ 759 struct dummy_ep *ep; 760 struct dummy *dum; 761 int retval = -EINVAL; 762 unsigned long flags; 763 struct dummy_request *req = NULL, *iter; 764 765 if (!_ep || !_req) 766 return retval; 767 ep = usb_ep_to_dummy_ep(_ep); 768 dum = ep_to_dummy(ep); 769 770 if (!dum->driver) 771 return -ESHUTDOWN; 772 773 spin_lock_irqsave(&dum->lock, flags); 774 list_for_each_entry(iter, &ep->queue, queue) { 775 if (&iter->req != _req) 776 continue; 777 list_del_init(&iter->queue); 778 _req->status = -ECONNRESET; 779 req = iter; 780 retval = 0; 781 break; 782 } 783 784 if (retval == 0) { 785 dev_dbg(udc_dev(dum), 786 "dequeued req %p from %s, len %d buf %p\n", 787 req, _ep->name, _req->length, _req->buf); 788 spin_unlock(&dum->lock); 789 usb_gadget_giveback_request(_ep, _req); 790 spin_lock(&dum->lock); 791 } 792 spin_unlock_irqrestore(&dum->lock, flags); 793 return retval; 794} 795 796static int 797dummy_set_halt_and_wedge(struct usb_ep *_ep, int value, int wedged) 798{ 799 struct dummy_ep *ep; 800 struct dummy *dum; 801 802 if (!_ep) 803 return -EINVAL; 804 ep = usb_ep_to_dummy_ep(_ep); 805 dum = ep_to_dummy(ep); 806 if (!dum->driver) 807 return -ESHUTDOWN; 808 if (!value) 809 ep->halted = ep->wedged = 0; 810 else if (ep->desc && (ep->desc->bEndpointAddress & USB_DIR_IN) && 811 !list_empty(&ep->queue)) 812 return -EAGAIN; 813 else { 814 ep->halted = 1; 815 if (wedged) 816 ep->wedged = 1; 817 } 818 /* FIXME clear emulated data toggle too */ 819 return 0; 820} 821 822static int 823dummy_set_halt(struct usb_ep *_ep, int value) 824{ 825 return dummy_set_halt_and_wedge(_ep, value, 0); 826} 827 828static int dummy_set_wedge(struct usb_ep *_ep) 829{ 830 if (!_ep || _ep->name == ep0name) 831 return -EINVAL; 832 return dummy_set_halt_and_wedge(_ep, 1, 1); 833} 834 835static const struct usb_ep_ops dummy_ep_ops = { 836 .enable = dummy_enable, 837 .disable = dummy_disable, 838 839 .alloc_request = dummy_alloc_request, 840 .free_request = dummy_free_request, 841 842 .queue = dummy_queue, 843 .dequeue = dummy_dequeue, 844 845 .set_halt = dummy_set_halt, 846 .set_wedge = dummy_set_wedge, 847}; 848 849/*-------------------------------------------------------------------------*/ 850 851/* there are both host and device side versions of this call ... */ 852static int dummy_g_get_frame(struct usb_gadget *_gadget) 853{ 854 struct timespec64 ts64; 855 856 ktime_get_ts64(&ts64); 857 return ts64.tv_nsec / NSEC_PER_MSEC; 858} 859 860static int dummy_wakeup(struct usb_gadget *_gadget) 861{ 862 struct dummy_hcd *dum_hcd; 863 864 dum_hcd = gadget_to_dummy_hcd(_gadget); 865 if (!(dum_hcd->dum->devstatus & ((1 << USB_DEVICE_B_HNP_ENABLE) 866 | (1 << USB_DEVICE_REMOTE_WAKEUP)))) 867 return -EINVAL; 868 if ((dum_hcd->port_status & USB_PORT_STAT_CONNECTION) == 0) 869 return -ENOLINK; 870 if ((dum_hcd->port_status & USB_PORT_STAT_SUSPEND) == 0 && 871 dum_hcd->rh_state != DUMMY_RH_SUSPENDED) 872 return -EIO; 873 874 /* FIXME: What if the root hub is suspended but the port isn't? */ 875 876 /* hub notices our request, issues downstream resume, etc */ 877 dum_hcd->resuming = 1; 878 dum_hcd->re_timeout = jiffies + msecs_to_jiffies(20); 879 mod_timer(&dummy_hcd_to_hcd(dum_hcd)->rh_timer, dum_hcd->re_timeout); 880 return 0; 881} 882 883static int dummy_set_selfpowered(struct usb_gadget *_gadget, int value) 884{ 885 struct dummy *dum; 886 887 _gadget->is_selfpowered = (value != 0); 888 dum = gadget_to_dummy_hcd(_gadget)->dum; 889 if (value) 890 dum->devstatus |= (1 << USB_DEVICE_SELF_POWERED); 891 else 892 dum->devstatus &= ~(1 << USB_DEVICE_SELF_POWERED); 893 return 0; 894} 895 896static void dummy_udc_update_ep0(struct dummy *dum) 897{ 898 if (dum->gadget.speed == USB_SPEED_SUPER) 899 dum->ep[0].ep.maxpacket = 9; 900 else 901 dum->ep[0].ep.maxpacket = 64; 902} 903 904static int dummy_pullup(struct usb_gadget *_gadget, int value) 905{ 906 struct dummy_hcd *dum_hcd; 907 struct dummy *dum; 908 unsigned long flags; 909 910 dum = gadget_dev_to_dummy(&_gadget->dev); 911 dum_hcd = gadget_to_dummy_hcd(_gadget); 912 913 spin_lock_irqsave(&dum->lock, flags); 914 dum->pullup = (value != 0); 915 set_link_state(dum_hcd); 916 spin_unlock_irqrestore(&dum->lock, flags); 917 918 usb_hcd_poll_rh_status(dummy_hcd_to_hcd(dum_hcd)); 919 return 0; 920} 921 922static void dummy_udc_set_speed(struct usb_gadget *_gadget, 923 enum usb_device_speed speed) 924{ 925 struct dummy *dum; 926 927 dum = gadget_dev_to_dummy(&_gadget->dev); 928 dum->gadget.speed = speed; 929 dummy_udc_update_ep0(dum); 930} 931 932static void dummy_udc_async_callbacks(struct usb_gadget *_gadget, bool enable) 933{ 934 struct dummy *dum = gadget_dev_to_dummy(&_gadget->dev); 935 936 spin_lock_irq(&dum->lock); 937 dum->ints_enabled = enable; 938 if (!enable) { 939 /* 940 * Emulate synchronize_irq(): wait for callbacks to finish. 941 * This has to happen after emulated interrupts are disabled 942 * (dum->ints_enabled is clear) and before the unbind callback, 943 * just like the call to synchronize_irq() in 944 * gadget/udc/core:gadget_unbind_driver(). 945 */ 946 while (dum->callback_usage > 0) { 947 spin_unlock_irq(&dum->lock); 948 usleep_range(1000, 2000); 949 spin_lock_irq(&dum->lock); 950 } 951 } 952 spin_unlock_irq(&dum->lock); 953} 954 955static int dummy_udc_start(struct usb_gadget *g, 956 struct usb_gadget_driver *driver); 957static int dummy_udc_stop(struct usb_gadget *g); 958 959static const struct usb_gadget_ops dummy_ops = { 960 .get_frame = dummy_g_get_frame, 961 .wakeup = dummy_wakeup, 962 .set_selfpowered = dummy_set_selfpowered, 963 .pullup = dummy_pullup, 964 .udc_start = dummy_udc_start, 965 .udc_stop = dummy_udc_stop, 966 .udc_set_speed = dummy_udc_set_speed, 967 .udc_async_callbacks = dummy_udc_async_callbacks, 968}; 969 970/*-------------------------------------------------------------------------*/ 971 972/* "function" sysfs attribute */ 973static ssize_t function_show(struct device *dev, struct device_attribute *attr, 974 char *buf) 975{ 976 struct dummy *dum = gadget_dev_to_dummy(dev); 977 978 if (!dum->driver || !dum->driver->function) 979 return 0; 980 return scnprintf(buf, PAGE_SIZE, "%s\n", dum->driver->function); 981} 982static DEVICE_ATTR_RO(function); 983 984/*-------------------------------------------------------------------------*/ 985 986/* 987 * Driver registration/unregistration. 988 * 989 * This is basically hardware-specific; there's usually only one real USB 990 * device (not host) controller since that's how USB devices are intended 991 * to work. So most implementations of these api calls will rely on the 992 * fact that only one driver will ever bind to the hardware. But curious 993 * hardware can be built with discrete components, so the gadget API doesn't 994 * require that assumption. 995 * 996 * For this emulator, it might be convenient to create a usb device 997 * for each driver that registers: just add to a big root hub. 998 */ 999 1000static int dummy_udc_start(struct usb_gadget *g, 1001 struct usb_gadget_driver *driver) 1002{ 1003 struct dummy_hcd *dum_hcd = gadget_to_dummy_hcd(g); 1004 struct dummy *dum = dum_hcd->dum; 1005 1006 switch (g->speed) { 1007 /* All the speeds we support */ 1008 case USB_SPEED_LOW: 1009 case USB_SPEED_FULL: 1010 case USB_SPEED_HIGH: 1011 case USB_SPEED_SUPER: 1012 break; 1013 default: 1014 dev_err(dummy_dev(dum_hcd), "Unsupported driver max speed %d\n", 1015 driver->max_speed); 1016 return -EINVAL; 1017 } 1018 1019 /* 1020 * DEVICE side init ... the layer above hardware, which 1021 * can't enumerate without help from the driver we're binding. 1022 */ 1023 1024 spin_lock_irq(&dum->lock); 1025 dum->devstatus = 0; 1026 dum->driver = driver; 1027 spin_unlock_irq(&dum->lock); 1028 1029 return 0; 1030} 1031 1032static int dummy_udc_stop(struct usb_gadget *g) 1033{ 1034 struct dummy_hcd *dum_hcd = gadget_to_dummy_hcd(g); 1035 struct dummy *dum = dum_hcd->dum; 1036 1037 spin_lock_irq(&dum->lock); 1038 dum->ints_enabled = 0; 1039 stop_activity(dum); 1040 dum->driver = NULL; 1041 spin_unlock_irq(&dum->lock); 1042 1043 return 0; 1044} 1045 1046#undef is_enabled 1047 1048/* The gadget structure is stored inside the hcd structure and will be 1049 * released along with it. */ 1050static void init_dummy_udc_hw(struct dummy *dum) 1051{ 1052 int i; 1053 1054 INIT_LIST_HEAD(&dum->gadget.ep_list); 1055 for (i = 0; i < DUMMY_ENDPOINTS; i++) { 1056 struct dummy_ep *ep = &dum->ep[i]; 1057 1058 if (!ep_info[i].name) 1059 break; 1060 ep->ep.name = ep_info[i].name; 1061 ep->ep.caps = ep_info[i].caps; 1062 ep->ep.ops = &dummy_ep_ops; 1063 list_add_tail(&ep->ep.ep_list, &dum->gadget.ep_list); 1064 ep->halted = ep->wedged = ep->already_seen = 1065 ep->setup_stage = 0; 1066 usb_ep_set_maxpacket_limit(&ep->ep, ~0); 1067 ep->ep.max_streams = 16; 1068 ep->last_io = jiffies; 1069 ep->gadget = &dum->gadget; 1070 ep->desc = NULL; 1071 INIT_LIST_HEAD(&ep->queue); 1072 } 1073 1074 dum->gadget.ep0 = &dum->ep[0].ep; 1075 list_del_init(&dum->ep[0].ep.ep_list); 1076 INIT_LIST_HEAD(&dum->fifo_req.queue); 1077 1078#ifdef CONFIG_USB_OTG 1079 dum->gadget.is_otg = 1; 1080#endif 1081} 1082 1083static int dummy_udc_probe(struct platform_device *pdev) 1084{ 1085 struct dummy *dum; 1086 int rc; 1087 1088 dum = *((void **)dev_get_platdata(&pdev->dev)); 1089 /* Clear usb_gadget region for new registration to udc-core */ 1090 memzero_explicit(&dum->gadget, sizeof(struct usb_gadget)); 1091 dum->gadget.name = gadget_name; 1092 dum->gadget.ops = &dummy_ops; 1093 if (mod_data.is_super_speed) 1094 dum->gadget.max_speed = USB_SPEED_SUPER; 1095 else if (mod_data.is_high_speed) 1096 dum->gadget.max_speed = USB_SPEED_HIGH; 1097 else 1098 dum->gadget.max_speed = USB_SPEED_FULL; 1099 1100 dum->gadget.dev.parent = &pdev->dev; 1101 init_dummy_udc_hw(dum); 1102 1103 rc = usb_add_gadget_udc(&pdev->dev, &dum->gadget); 1104 if (rc < 0) 1105 goto err_udc; 1106 1107 rc = device_create_file(&dum->gadget.dev, &dev_attr_function); 1108 if (rc < 0) 1109 goto err_dev; 1110 platform_set_drvdata(pdev, dum); 1111 return rc; 1112 1113err_dev: 1114 usb_del_gadget_udc(&dum->gadget); 1115err_udc: 1116 return rc; 1117} 1118 1119static void dummy_udc_remove(struct platform_device *pdev) 1120{ 1121 struct dummy *dum = platform_get_drvdata(pdev); 1122 1123 device_remove_file(&dum->gadget.dev, &dev_attr_function); 1124 usb_del_gadget_udc(&dum->gadget); 1125} 1126 1127static void dummy_udc_pm(struct dummy *dum, struct dummy_hcd *dum_hcd, 1128 int suspend) 1129{ 1130 spin_lock_irq(&dum->lock); 1131 dum->udc_suspended = suspend; 1132 set_link_state(dum_hcd); 1133 spin_unlock_irq(&dum->lock); 1134} 1135 1136static int dummy_udc_suspend(struct platform_device *pdev, pm_message_t state) 1137{ 1138 struct dummy *dum = platform_get_drvdata(pdev); 1139 struct dummy_hcd *dum_hcd = gadget_to_dummy_hcd(&dum->gadget); 1140 1141 dev_dbg(&pdev->dev, "%s\n", __func__); 1142 dummy_udc_pm(dum, dum_hcd, 1); 1143 usb_hcd_poll_rh_status(dummy_hcd_to_hcd(dum_hcd)); 1144 return 0; 1145} 1146 1147static int dummy_udc_resume(struct platform_device *pdev) 1148{ 1149 struct dummy *dum = platform_get_drvdata(pdev); 1150 struct dummy_hcd *dum_hcd = gadget_to_dummy_hcd(&dum->gadget); 1151 1152 dev_dbg(&pdev->dev, "%s\n", __func__); 1153 dummy_udc_pm(dum, dum_hcd, 0); 1154 usb_hcd_poll_rh_status(dummy_hcd_to_hcd(dum_hcd)); 1155 return 0; 1156} 1157 1158static struct platform_driver dummy_udc_driver = { 1159 .probe = dummy_udc_probe, 1160 .remove = dummy_udc_remove, 1161 .suspend = dummy_udc_suspend, 1162 .resume = dummy_udc_resume, 1163 .driver = { 1164 .name = gadget_name, 1165 }, 1166}; 1167 1168/*-------------------------------------------------------------------------*/ 1169 1170static unsigned int dummy_get_ep_idx(const struct usb_endpoint_descriptor *desc) 1171{ 1172 unsigned int index; 1173 1174 index = usb_endpoint_num(desc) << 1; 1175 if (usb_endpoint_dir_in(desc)) 1176 index |= 1; 1177 return index; 1178} 1179 1180/* HOST SIDE DRIVER 1181 * 1182 * this uses the hcd framework to hook up to host side drivers. 1183 * its root hub will only have one device, otherwise it acts like 1184 * a normal host controller. 1185 * 1186 * when urbs are queued, they're just stuck on a list that we 1187 * scan in a timer callback. that callback connects writes from 1188 * the host with reads from the device, and so on, based on the 1189 * usb 2.0 rules. 1190 */ 1191 1192static int dummy_ep_stream_en(struct dummy_hcd *dum_hcd, struct urb *urb) 1193{ 1194 const struct usb_endpoint_descriptor *desc = &urb->ep->desc; 1195 u32 index; 1196 1197 if (!usb_endpoint_xfer_bulk(desc)) 1198 return 0; 1199 1200 index = dummy_get_ep_idx(desc); 1201 return (1 << index) & dum_hcd->stream_en_ep; 1202} 1203 1204/* 1205 * The max stream number is saved as a nibble so for the 30 possible endpoints 1206 * we only 15 bytes of memory. Therefore we are limited to max 16 streams (0 1207 * means we use only 1 stream). The maximum according to the spec is 16bit so 1208 * if the 16 stream limit is about to go, the array size should be incremented 1209 * to 30 elements of type u16. 1210 */ 1211static int get_max_streams_for_pipe(struct dummy_hcd *dum_hcd, 1212 unsigned int pipe) 1213{ 1214 int max_streams; 1215 1216 max_streams = dum_hcd->num_stream[usb_pipeendpoint(pipe)]; 1217 if (usb_pipeout(pipe)) 1218 max_streams >>= 4; 1219 else 1220 max_streams &= 0xf; 1221 max_streams++; 1222 return max_streams; 1223} 1224 1225static void set_max_streams_for_pipe(struct dummy_hcd *dum_hcd, 1226 unsigned int pipe, unsigned int streams) 1227{ 1228 int max_streams; 1229 1230 streams--; 1231 max_streams = dum_hcd->num_stream[usb_pipeendpoint(pipe)]; 1232 if (usb_pipeout(pipe)) { 1233 streams <<= 4; 1234 max_streams &= 0xf; 1235 } else { 1236 max_streams &= 0xf0; 1237 } 1238 max_streams |= streams; 1239 dum_hcd->num_stream[usb_pipeendpoint(pipe)] = max_streams; 1240} 1241 1242static int dummy_validate_stream(struct dummy_hcd *dum_hcd, struct urb *urb) 1243{ 1244 unsigned int max_streams; 1245 int enabled; 1246 1247 enabled = dummy_ep_stream_en(dum_hcd, urb); 1248 if (!urb->stream_id) { 1249 if (enabled) 1250 return -EINVAL; 1251 return 0; 1252 } 1253 if (!enabled) 1254 return -EINVAL; 1255 1256 max_streams = get_max_streams_for_pipe(dum_hcd, 1257 usb_pipeendpoint(urb->pipe)); 1258 if (urb->stream_id > max_streams) { 1259 dev_err(dummy_dev(dum_hcd), "Stream id %d is out of range.\n", 1260 urb->stream_id); 1261 BUG(); 1262 return -EINVAL; 1263 } 1264 return 0; 1265} 1266 1267static int dummy_urb_enqueue( 1268 struct usb_hcd *hcd, 1269 struct urb *urb, 1270 gfp_t mem_flags 1271) { 1272 struct dummy_hcd *dum_hcd; 1273 struct urbp *urbp; 1274 unsigned long flags; 1275 int rc; 1276 1277 urbp = kmalloc(sizeof *urbp, mem_flags); 1278 if (!urbp) 1279 return -ENOMEM; 1280 urbp->urb = urb; 1281 urbp->miter_started = 0; 1282 1283 dum_hcd = hcd_to_dummy_hcd(hcd); 1284 spin_lock_irqsave(&dum_hcd->dum->lock, flags); 1285 1286 rc = dummy_validate_stream(dum_hcd, urb); 1287 if (rc) { 1288 kfree(urbp); 1289 goto done; 1290 } 1291 1292 rc = usb_hcd_link_urb_to_ep(hcd, urb); 1293 if (rc) { 1294 kfree(urbp); 1295 goto done; 1296 } 1297 1298 if (!dum_hcd->udev) { 1299 dum_hcd->udev = urb->dev; 1300 usb_get_dev(dum_hcd->udev); 1301 } else if (unlikely(dum_hcd->udev != urb->dev)) 1302 dev_err(dummy_dev(dum_hcd), "usb_device address has changed!\n"); 1303 1304 list_add_tail(&urbp->urbp_list, &dum_hcd->urbp_list); 1305 urb->hcpriv = urbp; 1306 if (!dum_hcd->next_frame_urbp) 1307 dum_hcd->next_frame_urbp = urbp; 1308 if (usb_pipetype(urb->pipe) == PIPE_CONTROL) 1309 urb->error_count = 1; /* mark as a new urb */ 1310 1311 /* kick the scheduler, it'll do the rest */ 1312 if (!dum_hcd->timer_pending) { 1313 dum_hcd->timer_pending = 1; 1314 hrtimer_start(&dum_hcd->timer, ns_to_ktime(DUMMY_TIMER_INT_NSECS), 1315 HRTIMER_MODE_REL_SOFT); 1316 } 1317 1318 done: 1319 spin_unlock_irqrestore(&dum_hcd->dum->lock, flags); 1320 return rc; 1321} 1322 1323static int dummy_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status) 1324{ 1325 struct dummy_hcd *dum_hcd; 1326 unsigned long flags; 1327 int rc; 1328 1329 /* giveback happens automatically in timer callback, 1330 * so make sure the callback happens */ 1331 dum_hcd = hcd_to_dummy_hcd(hcd); 1332 spin_lock_irqsave(&dum_hcd->dum->lock, flags); 1333 1334 rc = usb_hcd_check_unlink_urb(hcd, urb, status); 1335 if (rc == 0 && !dum_hcd->timer_pending) { 1336 dum_hcd->timer_pending = 1; 1337 hrtimer_start(&dum_hcd->timer, ns_to_ktime(0), HRTIMER_MODE_REL_SOFT); 1338 } 1339 1340 spin_unlock_irqrestore(&dum_hcd->dum->lock, flags); 1341 return rc; 1342} 1343 1344static int dummy_perform_transfer(struct urb *urb, struct dummy_request *req, 1345 u32 len) 1346{ 1347 void *ubuf, *rbuf; 1348 struct urbp *urbp = urb->hcpriv; 1349 int to_host; 1350 struct sg_mapping_iter *miter = &urbp->miter; 1351 u32 trans = 0; 1352 u32 this_sg; 1353 bool next_sg; 1354 1355 to_host = usb_urb_dir_in(urb); 1356 rbuf = req->req.buf + req->req.actual; 1357 1358 if (!urb->num_sgs) { 1359 ubuf = urb->transfer_buffer + urb->actual_length; 1360 if (to_host) 1361 memcpy(ubuf, rbuf, len); 1362 else 1363 memcpy(rbuf, ubuf, len); 1364 return len; 1365 } 1366 1367 if (!urbp->miter_started) { 1368 u32 flags = SG_MITER_ATOMIC; 1369 1370 if (to_host) 1371 flags |= SG_MITER_TO_SG; 1372 else 1373 flags |= SG_MITER_FROM_SG; 1374 1375 sg_miter_start(miter, urb->sg, urb->num_sgs, flags); 1376 urbp->miter_started = 1; 1377 } 1378 next_sg = sg_miter_next(miter); 1379 if (next_sg == false) { 1380 WARN_ON_ONCE(1); 1381 return -EINVAL; 1382 } 1383 do { 1384 ubuf = miter->addr; 1385 this_sg = min_t(u32, len, miter->length); 1386 miter->consumed = this_sg; 1387 trans += this_sg; 1388 1389 if (to_host) 1390 memcpy(ubuf, rbuf, this_sg); 1391 else 1392 memcpy(rbuf, ubuf, this_sg); 1393 len -= this_sg; 1394 1395 if (!len) 1396 break; 1397 next_sg = sg_miter_next(miter); 1398 if (next_sg == false) { 1399 WARN_ON_ONCE(1); 1400 return -EINVAL; 1401 } 1402 1403 rbuf += this_sg; 1404 } while (1); 1405 1406 sg_miter_stop(miter); 1407 return trans; 1408} 1409 1410/* transfer up to a frame's worth; caller must own lock */ 1411static int transfer(struct dummy_hcd *dum_hcd, struct urb *urb, 1412 struct dummy_ep *ep, int limit, int *status) 1413{ 1414 struct dummy *dum = dum_hcd->dum; 1415 struct dummy_request *req; 1416 int sent = 0; 1417 1418top: 1419 /* if there's no request queued, the device is NAKing; return */ 1420 list_for_each_entry(req, &ep->queue, queue) { 1421 unsigned host_len, dev_len, len; 1422 int is_short, to_host; 1423 int rescan = 0; 1424 1425 if (dummy_ep_stream_en(dum_hcd, urb)) { 1426 if ((urb->stream_id != req->req.stream_id)) 1427 continue; 1428 } 1429 1430 /* 1..N packets of ep->ep.maxpacket each ... the last one 1431 * may be short (including zero length). 1432 * 1433 * writer can send a zlp explicitly (length 0) or implicitly 1434 * (length mod maxpacket zero, and 'zero' flag); they always 1435 * terminate reads. 1436 */ 1437 host_len = urb->transfer_buffer_length - urb->actual_length; 1438 dev_len = req->req.length - req->req.actual; 1439 len = min(host_len, dev_len); 1440 1441 /* FIXME update emulated data toggle too */ 1442 1443 to_host = usb_urb_dir_in(urb); 1444 if (unlikely(len == 0)) 1445 is_short = 1; 1446 else { 1447 /* not enough bandwidth left? */ 1448 if (limit < ep->ep.maxpacket && limit < len) 1449 break; 1450 len = min_t(unsigned, len, limit); 1451 if (len == 0) 1452 break; 1453 1454 /* send multiple of maxpacket first, then remainder */ 1455 if (len >= ep->ep.maxpacket) { 1456 is_short = 0; 1457 if (len % ep->ep.maxpacket) 1458 rescan = 1; 1459 len -= len % ep->ep.maxpacket; 1460 } else { 1461 is_short = 1; 1462 } 1463 1464 len = dummy_perform_transfer(urb, req, len); 1465 1466 ep->last_io = jiffies; 1467 if ((int)len < 0) { 1468 req->req.status = len; 1469 } else { 1470 limit -= len; 1471 sent += len; 1472 urb->actual_length += len; 1473 req->req.actual += len; 1474 } 1475 } 1476 1477 /* short packets terminate, maybe with overflow/underflow. 1478 * it's only really an error to write too much. 1479 * 1480 * partially filling a buffer optionally blocks queue advances 1481 * (so completion handlers can clean up the queue) but we don't 1482 * need to emulate such data-in-flight. 1483 */ 1484 if (is_short) { 1485 if (host_len == dev_len) { 1486 req->req.status = 0; 1487 *status = 0; 1488 } else if (to_host) { 1489 req->req.status = 0; 1490 if (dev_len > host_len) 1491 *status = -EOVERFLOW; 1492 else 1493 *status = 0; 1494 } else { 1495 *status = 0; 1496 if (host_len > dev_len) 1497 req->req.status = -EOVERFLOW; 1498 else 1499 req->req.status = 0; 1500 } 1501 1502 /* 1503 * many requests terminate without a short packet. 1504 * send a zlp if demanded by flags. 1505 */ 1506 } else { 1507 if (req->req.length == req->req.actual) { 1508 if (req->req.zero && to_host) 1509 rescan = 1; 1510 else 1511 req->req.status = 0; 1512 } 1513 if (urb->transfer_buffer_length == urb->actual_length) { 1514 if (urb->transfer_flags & URB_ZERO_PACKET && 1515 !to_host) 1516 rescan = 1; 1517 else 1518 *status = 0; 1519 } 1520 } 1521 1522 /* device side completion --> continuable */ 1523 if (req->req.status != -EINPROGRESS) { 1524 list_del_init(&req->queue); 1525 1526 spin_unlock(&dum->lock); 1527 usb_gadget_giveback_request(&ep->ep, &req->req); 1528 spin_lock(&dum->lock); 1529 1530 /* requests might have been unlinked... */ 1531 rescan = 1; 1532 } 1533 1534 /* host side completion --> terminate */ 1535 if (*status != -EINPROGRESS) 1536 break; 1537 1538 /* rescan to continue with any other queued i/o */ 1539 if (rescan) 1540 goto top; 1541 1542 /* request not fully transferred; stop iterating to 1543 * preserve data ordering across queued requests. 1544 */ 1545 if (req->req.actual < req->req.length) 1546 break; 1547 } 1548 return sent; 1549} 1550 1551static int periodic_bytes(struct dummy *dum, struct dummy_ep *ep) 1552{ 1553 int limit = ep->ep.maxpacket; 1554 1555 if (dum->gadget.speed == USB_SPEED_HIGH) { 1556 int tmp; 1557 1558 /* high bandwidth mode */ 1559 tmp = usb_endpoint_maxp_mult(ep->desc); 1560 tmp *= 8 /* applies to entire frame */; 1561 limit += limit * tmp; 1562 } 1563 if (dum->gadget.speed == USB_SPEED_SUPER) { 1564 switch (usb_endpoint_type(ep->desc)) { 1565 case USB_ENDPOINT_XFER_ISOC: 1566 /* Sec. 4.4.8.2 USB3.0 Spec */ 1567 limit = 3 * 16 * 1024 * 8; 1568 break; 1569 case USB_ENDPOINT_XFER_INT: 1570 /* Sec. 4.4.7.2 USB3.0 Spec */ 1571 limit = 3 * 1024 * 8; 1572 break; 1573 case USB_ENDPOINT_XFER_BULK: 1574 default: 1575 break; 1576 } 1577 } 1578 return limit; 1579} 1580 1581#define is_active(dum_hcd) ((dum_hcd->port_status & \ 1582 (USB_PORT_STAT_CONNECTION | USB_PORT_STAT_ENABLE | \ 1583 USB_PORT_STAT_SUSPEND)) \ 1584 == (USB_PORT_STAT_CONNECTION | USB_PORT_STAT_ENABLE)) 1585 1586static struct dummy_ep *find_endpoint(struct dummy *dum, u8 address) 1587{ 1588 int i; 1589 1590 if (!is_active((dum->gadget.speed == USB_SPEED_SUPER ? 1591 dum->ss_hcd : dum->hs_hcd))) 1592 return NULL; 1593 if (!dum->ints_enabled) 1594 return NULL; 1595 if ((address & ~USB_DIR_IN) == 0) 1596 return &dum->ep[0]; 1597 for (i = 1; i < DUMMY_ENDPOINTS; i++) { 1598 struct dummy_ep *ep = &dum->ep[i]; 1599 1600 if (!ep->desc) 1601 continue; 1602 if (ep->desc->bEndpointAddress == address) 1603 return ep; 1604 } 1605 return NULL; 1606} 1607 1608#undef is_active 1609 1610#define Dev_Request (USB_TYPE_STANDARD | USB_RECIP_DEVICE) 1611#define Dev_InRequest (Dev_Request | USB_DIR_IN) 1612#define Intf_Request (USB_TYPE_STANDARD | USB_RECIP_INTERFACE) 1613#define Intf_InRequest (Intf_Request | USB_DIR_IN) 1614#define Ep_Request (USB_TYPE_STANDARD | USB_RECIP_ENDPOINT) 1615#define Ep_InRequest (Ep_Request | USB_DIR_IN) 1616 1617 1618/** 1619 * handle_control_request() - handles all control transfers 1620 * @dum_hcd: pointer to dummy (the_controller) 1621 * @urb: the urb request to handle 1622 * @setup: pointer to the setup data for a USB device control 1623 * request 1624 * @status: pointer to request handling status 1625 * 1626 * Return 0 - if the request was handled 1627 * 1 - if the request wasn't handles 1628 * error code on error 1629 */ 1630static int handle_control_request(struct dummy_hcd *dum_hcd, struct urb *urb, 1631 struct usb_ctrlrequest *setup, 1632 int *status) 1633{ 1634 struct dummy_ep *ep2; 1635 struct dummy *dum = dum_hcd->dum; 1636 int ret_val = 1; 1637 unsigned w_index; 1638 unsigned w_value; 1639 1640 w_index = le16_to_cpu(setup->wIndex); 1641 w_value = le16_to_cpu(setup->wValue); 1642 switch (setup->bRequest) { 1643 case USB_REQ_SET_ADDRESS: 1644 if (setup->bRequestType != Dev_Request) 1645 break; 1646 dum->address = w_value; 1647 *status = 0; 1648 dev_dbg(udc_dev(dum), "set_address = %d\n", 1649 w_value); 1650 ret_val = 0; 1651 break; 1652 case USB_REQ_SET_FEATURE: 1653 if (setup->bRequestType == Dev_Request) { 1654 ret_val = 0; 1655 switch (w_value) { 1656 case USB_DEVICE_REMOTE_WAKEUP: 1657 break; 1658 case USB_DEVICE_B_HNP_ENABLE: 1659 dum->gadget.b_hnp_enable = 1; 1660 break; 1661 case USB_DEVICE_A_HNP_SUPPORT: 1662 dum->gadget.a_hnp_support = 1; 1663 break; 1664 case USB_DEVICE_A_ALT_HNP_SUPPORT: 1665 dum->gadget.a_alt_hnp_support = 1; 1666 break; 1667 case USB_DEVICE_U1_ENABLE: 1668 if (dummy_hcd_to_hcd(dum_hcd)->speed == 1669 HCD_USB3) 1670 w_value = USB_DEV_STAT_U1_ENABLED; 1671 else 1672 ret_val = -EOPNOTSUPP; 1673 break; 1674 case USB_DEVICE_U2_ENABLE: 1675 if (dummy_hcd_to_hcd(dum_hcd)->speed == 1676 HCD_USB3) 1677 w_value = USB_DEV_STAT_U2_ENABLED; 1678 else 1679 ret_val = -EOPNOTSUPP; 1680 break; 1681 case USB_DEVICE_LTM_ENABLE: 1682 if (dummy_hcd_to_hcd(dum_hcd)->speed == 1683 HCD_USB3) 1684 w_value = USB_DEV_STAT_LTM_ENABLED; 1685 else 1686 ret_val = -EOPNOTSUPP; 1687 break; 1688 default: 1689 ret_val = -EOPNOTSUPP; 1690 } 1691 if (ret_val == 0) { 1692 dum->devstatus |= (1 << w_value); 1693 *status = 0; 1694 } 1695 } else if (setup->bRequestType == Ep_Request) { 1696 /* endpoint halt */ 1697 ep2 = find_endpoint(dum, w_index); 1698 if (!ep2 || ep2->ep.name == ep0name) { 1699 ret_val = -EOPNOTSUPP; 1700 break; 1701 } 1702 ep2->halted = 1; 1703 ret_val = 0; 1704 *status = 0; 1705 } 1706 break; 1707 case USB_REQ_CLEAR_FEATURE: 1708 if (setup->bRequestType == Dev_Request) { 1709 ret_val = 0; 1710 switch (w_value) { 1711 case USB_DEVICE_REMOTE_WAKEUP: 1712 w_value = USB_DEVICE_REMOTE_WAKEUP; 1713 break; 1714 case USB_DEVICE_U1_ENABLE: 1715 if (dummy_hcd_to_hcd(dum_hcd)->speed == 1716 HCD_USB3) 1717 w_value = USB_DEV_STAT_U1_ENABLED; 1718 else 1719 ret_val = -EOPNOTSUPP; 1720 break; 1721 case USB_DEVICE_U2_ENABLE: 1722 if (dummy_hcd_to_hcd(dum_hcd)->speed == 1723 HCD_USB3) 1724 w_value = USB_DEV_STAT_U2_ENABLED; 1725 else 1726 ret_val = -EOPNOTSUPP; 1727 break; 1728 case USB_DEVICE_LTM_ENABLE: 1729 if (dummy_hcd_to_hcd(dum_hcd)->speed == 1730 HCD_USB3) 1731 w_value = USB_DEV_STAT_LTM_ENABLED; 1732 else 1733 ret_val = -EOPNOTSUPP; 1734 break; 1735 default: 1736 ret_val = -EOPNOTSUPP; 1737 break; 1738 } 1739 if (ret_val == 0) { 1740 dum->devstatus &= ~(1 << w_value); 1741 *status = 0; 1742 } 1743 } else if (setup->bRequestType == Ep_Request) { 1744 /* endpoint halt */ 1745 ep2 = find_endpoint(dum, w_index); 1746 if (!ep2) { 1747 ret_val = -EOPNOTSUPP; 1748 break; 1749 } 1750 if (!ep2->wedged) 1751 ep2->halted = 0; 1752 ret_val = 0; 1753 *status = 0; 1754 } 1755 break; 1756 case USB_REQ_GET_STATUS: 1757 if (setup->bRequestType == Dev_InRequest 1758 || setup->bRequestType == Intf_InRequest 1759 || setup->bRequestType == Ep_InRequest) { 1760 char *buf; 1761 /* 1762 * device: remote wakeup, selfpowered 1763 * interface: nothing 1764 * endpoint: halt 1765 */ 1766 buf = (char *)urb->transfer_buffer; 1767 if (urb->transfer_buffer_length > 0) { 1768 if (setup->bRequestType == Ep_InRequest) { 1769 ep2 = find_endpoint(dum, w_index); 1770 if (!ep2) { 1771 ret_val = -EOPNOTSUPP; 1772 break; 1773 } 1774 buf[0] = ep2->halted; 1775 } else if (setup->bRequestType == 1776 Dev_InRequest) { 1777 buf[0] = (u8)dum->devstatus; 1778 } else 1779 buf[0] = 0; 1780 } 1781 if (urb->transfer_buffer_length > 1) 1782 buf[1] = 0; 1783 urb->actual_length = min_t(u32, 2, 1784 urb->transfer_buffer_length); 1785 ret_val = 0; 1786 *status = 0; 1787 } 1788 break; 1789 } 1790 return ret_val; 1791} 1792 1793/* 1794 * Drive both sides of the transfers; looks like irq handlers to both 1795 * drivers except that the callbacks are invoked from soft interrupt 1796 * context. 1797 */ 1798static enum hrtimer_restart dummy_timer(struct hrtimer *t) 1799{ 1800 struct dummy_hcd *dum_hcd = timer_container_of(dum_hcd, t, 1801 timer); 1802 struct dummy *dum = dum_hcd->dum; 1803 struct urbp *urbp, *tmp; 1804 unsigned long flags; 1805 int limit, total; 1806 int i; 1807 1808 /* simplistic model for one frame's bandwidth */ 1809 /* FIXME: account for transaction and packet overhead */ 1810 switch (dum->gadget.speed) { 1811 case USB_SPEED_LOW: 1812 total = 8/*bytes*/ * 12/*packets*/; 1813 break; 1814 case USB_SPEED_FULL: 1815 total = 64/*bytes*/ * 19/*packets*/; 1816 break; 1817 case USB_SPEED_HIGH: 1818 total = 512/*bytes*/ * 13/*packets*/ * 8/*uframes*/; 1819 break; 1820 case USB_SPEED_SUPER: 1821 /* Bus speed is 500000 bytes/ms, so use a little less */ 1822 total = 490000; 1823 break; 1824 default: /* Can't happen */ 1825 dev_err(dummy_dev(dum_hcd), "bogus device speed\n"); 1826 total = 0; 1827 break; 1828 } 1829 1830 /* look at each urb queued by the host side driver */ 1831 spin_lock_irqsave(&dum->lock, flags); 1832 dum_hcd->timer_pending = 0; 1833 1834 if (!dum_hcd->udev) { 1835 dev_err(dummy_dev(dum_hcd), 1836 "timer fired with no URBs pending?\n"); 1837 spin_unlock_irqrestore(&dum->lock, flags); 1838 return HRTIMER_NORESTART; 1839 } 1840 dum_hcd->next_frame_urbp = NULL; 1841 1842 for (i = 0; i < DUMMY_ENDPOINTS; i++) { 1843 if (!ep_info[i].name) 1844 break; 1845 dum->ep[i].already_seen = 0; 1846 } 1847 1848restart: 1849 list_for_each_entry_safe(urbp, tmp, &dum_hcd->urbp_list, urbp_list) { 1850 struct urb *urb; 1851 struct dummy_request *req; 1852 u8 address; 1853 struct dummy_ep *ep = NULL; 1854 int status = -EINPROGRESS; 1855 1856 /* stop when we reach URBs queued after the timer interrupt */ 1857 if (urbp == dum_hcd->next_frame_urbp) 1858 break; 1859 1860 urb = urbp->urb; 1861 if (urb->unlinked) 1862 goto return_urb; 1863 else if (dum_hcd->rh_state != DUMMY_RH_RUNNING) 1864 continue; 1865 1866 /* Used up this frame's bandwidth? */ 1867 if (total <= 0) 1868 continue; 1869 1870 /* find the gadget's ep for this request (if configured) */ 1871 address = usb_pipeendpoint (urb->pipe); 1872 if (usb_urb_dir_in(urb)) 1873 address |= USB_DIR_IN; 1874 ep = find_endpoint(dum, address); 1875 if (!ep) { 1876 /* set_configuration() disagreement */ 1877 dev_dbg(dummy_dev(dum_hcd), 1878 "no ep configured for urb %p\n", 1879 urb); 1880 status = -EPROTO; 1881 goto return_urb; 1882 } 1883 1884 if (ep->already_seen) 1885 continue; 1886 ep->already_seen = 1; 1887 if (ep == &dum->ep[0] && urb->error_count) { 1888 ep->setup_stage = 1; /* a new urb */ 1889 urb->error_count = 0; 1890 } 1891 if (ep->halted && !ep->setup_stage) { 1892 /* NOTE: must not be iso! */ 1893 dev_dbg(dummy_dev(dum_hcd), "ep %s halted, urb %p\n", 1894 ep->ep.name, urb); 1895 status = -EPIPE; 1896 goto return_urb; 1897 } 1898 /* FIXME make sure both ends agree on maxpacket */ 1899 1900 /* handle control requests */ 1901 if (ep == &dum->ep[0] && ep->setup_stage) { 1902 struct usb_ctrlrequest setup; 1903 int value; 1904 1905 setup = *(struct usb_ctrlrequest *) urb->setup_packet; 1906 /* paranoia, in case of stale queued data */ 1907 list_for_each_entry(req, &ep->queue, queue) { 1908 list_del_init(&req->queue); 1909 req->req.status = -EOVERFLOW; 1910 dev_dbg(udc_dev(dum), "stale req = %p\n", 1911 req); 1912 1913 spin_unlock(&dum->lock); 1914 usb_gadget_giveback_request(&ep->ep, &req->req); 1915 spin_lock(&dum->lock); 1916 ep->already_seen = 0; 1917 goto restart; 1918 } 1919 1920 /* gadget driver never sees set_address or operations 1921 * on standard feature flags. some hardware doesn't 1922 * even expose them. 1923 */ 1924 ep->last_io = jiffies; 1925 ep->setup_stage = 0; 1926 ep->halted = 0; 1927 1928 value = handle_control_request(dum_hcd, urb, &setup, 1929 &status); 1930 1931 /* gadget driver handles all other requests. block 1932 * until setup() returns; no reentrancy issues etc. 1933 */ 1934 if (value > 0) { 1935 ++dum->callback_usage; 1936 spin_unlock(&dum->lock); 1937 value = dum->driver->setup(&dum->gadget, 1938 &setup); 1939 spin_lock(&dum->lock); 1940 --dum->callback_usage; 1941 1942 if (value >= 0) { 1943 /* no delays (max 64KB data stage) */ 1944 limit = 64*1024; 1945 goto treat_control_like_bulk; 1946 } 1947 /* error, see below */ 1948 } 1949 1950 if (value < 0) { 1951 if (value != -EOPNOTSUPP) 1952 dev_dbg(udc_dev(dum), 1953 "setup --> %d\n", 1954 value); 1955 status = -EPIPE; 1956 urb->actual_length = 0; 1957 } 1958 1959 goto return_urb; 1960 } 1961 1962 /* non-control requests */ 1963 limit = total; 1964 switch (usb_pipetype(urb->pipe)) { 1965 case PIPE_ISOCHRONOUS: 1966 /* 1967 * We don't support isochronous. But if we did, 1968 * here are some of the issues we'd have to face: 1969 * 1970 * Is it urb->interval since the last xfer? 1971 * Use urb->iso_frame_desc[i]. 1972 * Complete whether or not ep has requests queued. 1973 * Report random errors, to debug drivers. 1974 */ 1975 limit = max(limit, periodic_bytes(dum, ep)); 1976 status = -EINVAL; /* fail all xfers */ 1977 break; 1978 1979 case PIPE_INTERRUPT: 1980 /* FIXME is it urb->interval since the last xfer? 1981 * this almost certainly polls too fast. 1982 */ 1983 limit = max(limit, periodic_bytes(dum, ep)); 1984 fallthrough; 1985 1986 default: 1987treat_control_like_bulk: 1988 ep->last_io = jiffies; 1989 total -= transfer(dum_hcd, urb, ep, limit, &status); 1990 break; 1991 } 1992 1993 /* incomplete transfer? */ 1994 if (status == -EINPROGRESS) 1995 continue; 1996 1997return_urb: 1998 list_del(&urbp->urbp_list); 1999 kfree(urbp); 2000 if (ep) 2001 ep->already_seen = ep->setup_stage = 0; 2002 2003 usb_hcd_unlink_urb_from_ep(dummy_hcd_to_hcd(dum_hcd), urb); 2004 spin_unlock(&dum->lock); 2005 usb_hcd_giveback_urb(dummy_hcd_to_hcd(dum_hcd), urb, status); 2006 spin_lock(&dum->lock); 2007 2008 goto restart; 2009 } 2010 2011 if (list_empty(&dum_hcd->urbp_list)) { 2012 usb_put_dev(dum_hcd->udev); 2013 dum_hcd->udev = NULL; 2014 } else if (!dum_hcd->timer_pending && 2015 dum_hcd->rh_state == DUMMY_RH_RUNNING) { 2016 /* want a 1 msec delay here */ 2017 dum_hcd->timer_pending = 1; 2018 hrtimer_start(&dum_hcd->timer, ns_to_ktime(DUMMY_TIMER_INT_NSECS), 2019 HRTIMER_MODE_REL_SOFT); 2020 } 2021 2022 spin_unlock_irqrestore(&dum->lock, flags); 2023 2024 return HRTIMER_NORESTART; 2025} 2026 2027/*-------------------------------------------------------------------------*/ 2028 2029#define PORT_C_MASK \ 2030 ((USB_PORT_STAT_C_CONNECTION \ 2031 | USB_PORT_STAT_C_ENABLE \ 2032 | USB_PORT_STAT_C_SUSPEND \ 2033 | USB_PORT_STAT_C_OVERCURRENT \ 2034 | USB_PORT_STAT_C_RESET) << 16) 2035 2036static int dummy_hub_status(struct usb_hcd *hcd, char *buf) 2037{ 2038 struct dummy_hcd *dum_hcd; 2039 unsigned long flags; 2040 int retval = 0; 2041 2042 dum_hcd = hcd_to_dummy_hcd(hcd); 2043 2044 spin_lock_irqsave(&dum_hcd->dum->lock, flags); 2045 if (!HCD_HW_ACCESSIBLE(hcd)) 2046 goto done; 2047 2048 if (dum_hcd->resuming && time_after_eq(jiffies, dum_hcd->re_timeout)) { 2049 dum_hcd->port_status |= (USB_PORT_STAT_C_SUSPEND << 16); 2050 dum_hcd->port_status &= ~USB_PORT_STAT_SUSPEND; 2051 set_link_state(dum_hcd); 2052 } 2053 2054 if ((dum_hcd->port_status & PORT_C_MASK) != 0) { 2055 *buf = (1 << 1); 2056 dev_dbg(dummy_dev(dum_hcd), "port status 0x%08x has changes\n", 2057 dum_hcd->port_status); 2058 retval = 1; 2059 if (dum_hcd->rh_state == DUMMY_RH_SUSPENDED) 2060 usb_hcd_resume_root_hub(hcd); 2061 } 2062done: 2063 spin_unlock_irqrestore(&dum_hcd->dum->lock, flags); 2064 return retval; 2065} 2066 2067/* usb 3.0 root hub device descriptor */ 2068static struct { 2069 struct usb_bos_descriptor bos; 2070 struct usb_ss_cap_descriptor ss_cap; 2071} __packed usb3_bos_desc = { 2072 2073 .bos = { 2074 .bLength = USB_DT_BOS_SIZE, 2075 .bDescriptorType = USB_DT_BOS, 2076 .wTotalLength = cpu_to_le16(sizeof(usb3_bos_desc)), 2077 .bNumDeviceCaps = 1, 2078 }, 2079 .ss_cap = { 2080 .bLength = USB_DT_USB_SS_CAP_SIZE, 2081 .bDescriptorType = USB_DT_DEVICE_CAPABILITY, 2082 .bDevCapabilityType = USB_SS_CAP_TYPE, 2083 .wSpeedSupported = cpu_to_le16(USB_5GBPS_OPERATION), 2084 .bFunctionalitySupport = ilog2(USB_5GBPS_OPERATION), 2085 }, 2086}; 2087 2088static inline void 2089ss_hub_descriptor(struct usb_hub_descriptor *desc) 2090{ 2091 memset(desc, 0, sizeof *desc); 2092 desc->bDescriptorType = USB_DT_SS_HUB; 2093 desc->bDescLength = 12; 2094 desc->wHubCharacteristics = cpu_to_le16( 2095 HUB_CHAR_INDV_PORT_LPSM | 2096 HUB_CHAR_COMMON_OCPM); 2097 desc->bNbrPorts = 1; 2098 desc->u.ss.bHubHdrDecLat = 0x04; /* Worst case: 0.4 micro sec*/ 2099 desc->u.ss.DeviceRemovable = 0; 2100} 2101 2102static inline void hub_descriptor(struct usb_hub_descriptor *desc) 2103{ 2104 memset(desc, 0, sizeof *desc); 2105 desc->bDescriptorType = USB_DT_HUB; 2106 desc->bDescLength = 9; 2107 desc->wHubCharacteristics = cpu_to_le16( 2108 HUB_CHAR_INDV_PORT_LPSM | 2109 HUB_CHAR_COMMON_OCPM); 2110 desc->bNbrPorts = 1; 2111 desc->u.hs.DeviceRemovable[0] = 0; 2112 desc->u.hs.DeviceRemovable[1] = 0xff; /* PortPwrCtrlMask */ 2113} 2114 2115static int dummy_hub_control( 2116 struct usb_hcd *hcd, 2117 u16 typeReq, 2118 u16 wValue, 2119 u16 wIndex, 2120 char *buf, 2121 u16 wLength 2122) { 2123 struct dummy_hcd *dum_hcd; 2124 int retval = 0; 2125 unsigned long flags; 2126 2127 if (!HCD_HW_ACCESSIBLE(hcd)) 2128 return -ETIMEDOUT; 2129 2130 dum_hcd = hcd_to_dummy_hcd(hcd); 2131 2132 spin_lock_irqsave(&dum_hcd->dum->lock, flags); 2133 switch (typeReq) { 2134 case ClearHubFeature: 2135 break; 2136 case ClearPortFeature: 2137 switch (wValue) { 2138 case USB_PORT_FEAT_SUSPEND: 2139 if (hcd->speed == HCD_USB3) { 2140 dev_dbg(dummy_dev(dum_hcd), 2141 "USB_PORT_FEAT_SUSPEND req not " 2142 "supported for USB 3.0 roothub\n"); 2143 goto error; 2144 } 2145 if (dum_hcd->port_status & USB_PORT_STAT_SUSPEND) { 2146 /* 20msec resume signaling */ 2147 dum_hcd->resuming = 1; 2148 dum_hcd->re_timeout = jiffies + 2149 msecs_to_jiffies(20); 2150 } 2151 break; 2152 case USB_PORT_FEAT_POWER: 2153 dev_dbg(dummy_dev(dum_hcd), "power-off\n"); 2154 if (hcd->speed == HCD_USB3) 2155 dum_hcd->port_status &= ~USB_SS_PORT_STAT_POWER; 2156 else 2157 dum_hcd->port_status &= ~USB_PORT_STAT_POWER; 2158 set_link_state(dum_hcd); 2159 break; 2160 case USB_PORT_FEAT_ENABLE: 2161 case USB_PORT_FEAT_C_ENABLE: 2162 case USB_PORT_FEAT_C_SUSPEND: 2163 /* Not allowed for USB-3 */ 2164 if (hcd->speed == HCD_USB3) 2165 goto error; 2166 fallthrough; 2167 case USB_PORT_FEAT_C_CONNECTION: 2168 case USB_PORT_FEAT_C_RESET: 2169 dum_hcd->port_status &= ~(1 << wValue); 2170 set_link_state(dum_hcd); 2171 break; 2172 default: 2173 /* Disallow INDICATOR and C_OVER_CURRENT */ 2174 goto error; 2175 } 2176 break; 2177 case GetHubDescriptor: 2178 if (hcd->speed == HCD_USB3 && 2179 (wLength < USB_DT_SS_HUB_SIZE || 2180 wValue != (USB_DT_SS_HUB << 8))) { 2181 dev_dbg(dummy_dev(dum_hcd), 2182 "Wrong hub descriptor type for " 2183 "USB 3.0 roothub.\n"); 2184 goto error; 2185 } 2186 if (hcd->speed == HCD_USB3) 2187 ss_hub_descriptor((struct usb_hub_descriptor *) buf); 2188 else 2189 hub_descriptor((struct usb_hub_descriptor *) buf); 2190 break; 2191 2192 case DeviceRequest | USB_REQ_GET_DESCRIPTOR: 2193 if (hcd->speed != HCD_USB3) 2194 goto error; 2195 2196 if ((wValue >> 8) != USB_DT_BOS) 2197 goto error; 2198 2199 memcpy(buf, &usb3_bos_desc, sizeof(usb3_bos_desc)); 2200 retval = sizeof(usb3_bos_desc); 2201 break; 2202 2203 case GetHubStatus: 2204 *(__le32 *) buf = cpu_to_le32(0); 2205 break; 2206 case GetPortStatus: 2207 if (wIndex != 1) 2208 retval = -EPIPE; 2209 2210 /* whoever resets or resumes must GetPortStatus to 2211 * complete it!! 2212 */ 2213 if (dum_hcd->resuming && 2214 time_after_eq(jiffies, dum_hcd->re_timeout)) { 2215 dum_hcd->port_status |= (USB_PORT_STAT_C_SUSPEND << 16); 2216 dum_hcd->port_status &= ~USB_PORT_STAT_SUSPEND; 2217 } 2218 if ((dum_hcd->port_status & USB_PORT_STAT_RESET) != 0 && 2219 time_after_eq(jiffies, dum_hcd->re_timeout)) { 2220 dum_hcd->port_status |= (USB_PORT_STAT_C_RESET << 16); 2221 dum_hcd->port_status &= ~USB_PORT_STAT_RESET; 2222 if (dum_hcd->dum->pullup) { 2223 dum_hcd->port_status |= USB_PORT_STAT_ENABLE; 2224 2225 if (hcd->speed < HCD_USB3) { 2226 switch (dum_hcd->dum->gadget.speed) { 2227 case USB_SPEED_HIGH: 2228 dum_hcd->port_status |= 2229 USB_PORT_STAT_HIGH_SPEED; 2230 break; 2231 case USB_SPEED_LOW: 2232 dum_hcd->dum->gadget.ep0-> 2233 maxpacket = 8; 2234 dum_hcd->port_status |= 2235 USB_PORT_STAT_LOW_SPEED; 2236 break; 2237 default: 2238 break; 2239 } 2240 } 2241 } 2242 } 2243 set_link_state(dum_hcd); 2244 ((__le16 *) buf)[0] = cpu_to_le16(dum_hcd->port_status); 2245 ((__le16 *) buf)[1] = cpu_to_le16(dum_hcd->port_status >> 16); 2246 break; 2247 case SetHubFeature: 2248 retval = -EPIPE; 2249 break; 2250 case SetPortFeature: 2251 switch (wValue) { 2252 case USB_PORT_FEAT_LINK_STATE: 2253 if (hcd->speed != HCD_USB3) { 2254 dev_dbg(dummy_dev(dum_hcd), 2255 "USB_PORT_FEAT_LINK_STATE req not " 2256 "supported for USB 2.0 roothub\n"); 2257 goto error; 2258 } 2259 /* 2260 * Since this is dummy we don't have an actual link so 2261 * there is nothing to do for the SET_LINK_STATE cmd 2262 */ 2263 break; 2264 case USB_PORT_FEAT_U1_TIMEOUT: 2265 case USB_PORT_FEAT_U2_TIMEOUT: 2266 /* TODO: add suspend/resume support! */ 2267 if (hcd->speed != HCD_USB3) { 2268 dev_dbg(dummy_dev(dum_hcd), 2269 "USB_PORT_FEAT_U1/2_TIMEOUT req not " 2270 "supported for USB 2.0 roothub\n"); 2271 goto error; 2272 } 2273 break; 2274 case USB_PORT_FEAT_SUSPEND: 2275 /* Applicable only for USB2.0 hub */ 2276 if (hcd->speed == HCD_USB3) { 2277 dev_dbg(dummy_dev(dum_hcd), 2278 "USB_PORT_FEAT_SUSPEND req not " 2279 "supported for USB 3.0 roothub\n"); 2280 goto error; 2281 } 2282 if (dum_hcd->active) { 2283 dum_hcd->port_status |= USB_PORT_STAT_SUSPEND; 2284 2285 /* HNP would happen here; for now we 2286 * assume b_bus_req is always true. 2287 */ 2288 set_link_state(dum_hcd); 2289 if (((1 << USB_DEVICE_B_HNP_ENABLE) 2290 & dum_hcd->dum->devstatus) != 0) 2291 dev_dbg(dummy_dev(dum_hcd), 2292 "no HNP yet!\n"); 2293 } 2294 break; 2295 case USB_PORT_FEAT_POWER: 2296 if (hcd->speed == HCD_USB3) 2297 dum_hcd->port_status |= USB_SS_PORT_STAT_POWER; 2298 else 2299 dum_hcd->port_status |= USB_PORT_STAT_POWER; 2300 set_link_state(dum_hcd); 2301 break; 2302 case USB_PORT_FEAT_BH_PORT_RESET: 2303 /* Applicable only for USB3.0 hub */ 2304 if (hcd->speed != HCD_USB3) { 2305 dev_dbg(dummy_dev(dum_hcd), 2306 "USB_PORT_FEAT_BH_PORT_RESET req not " 2307 "supported for USB 2.0 roothub\n"); 2308 goto error; 2309 } 2310 fallthrough; 2311 case USB_PORT_FEAT_RESET: 2312 if (!(dum_hcd->port_status & USB_PORT_STAT_CONNECTION)) 2313 break; 2314 /* if it's already enabled, disable */ 2315 if (hcd->speed == HCD_USB3) { 2316 dum_hcd->port_status = 2317 (USB_SS_PORT_STAT_POWER | 2318 USB_PORT_STAT_CONNECTION | 2319 USB_PORT_STAT_RESET); 2320 } else { 2321 dum_hcd->port_status &= ~(USB_PORT_STAT_ENABLE 2322 | USB_PORT_STAT_LOW_SPEED 2323 | USB_PORT_STAT_HIGH_SPEED); 2324 dum_hcd->port_status |= USB_PORT_STAT_RESET; 2325 } 2326 /* 2327 * We want to reset device status. All but the 2328 * Self powered feature 2329 */ 2330 dum_hcd->dum->devstatus &= 2331 (1 << USB_DEVICE_SELF_POWERED); 2332 /* 2333 * FIXME USB3.0: what is the correct reset signaling 2334 * interval? Is it still 50msec as for HS? 2335 */ 2336 dum_hcd->re_timeout = jiffies + msecs_to_jiffies(50); 2337 set_link_state(dum_hcd); 2338 break; 2339 case USB_PORT_FEAT_C_CONNECTION: 2340 case USB_PORT_FEAT_C_RESET: 2341 case USB_PORT_FEAT_C_ENABLE: 2342 case USB_PORT_FEAT_C_SUSPEND: 2343 /* Not allowed for USB-3, and ignored for USB-2 */ 2344 if (hcd->speed == HCD_USB3) 2345 goto error; 2346 break; 2347 default: 2348 /* Disallow TEST, INDICATOR, and C_OVER_CURRENT */ 2349 goto error; 2350 } 2351 break; 2352 case GetPortErrorCount: 2353 if (hcd->speed != HCD_USB3) { 2354 dev_dbg(dummy_dev(dum_hcd), 2355 "GetPortErrorCount req not " 2356 "supported for USB 2.0 roothub\n"); 2357 goto error; 2358 } 2359 /* We'll always return 0 since this is a dummy hub */ 2360 *(__le32 *) buf = cpu_to_le32(0); 2361 break; 2362 case SetHubDepth: 2363 if (hcd->speed != HCD_USB3) { 2364 dev_dbg(dummy_dev(dum_hcd), 2365 "SetHubDepth req not supported for " 2366 "USB 2.0 roothub\n"); 2367 goto error; 2368 } 2369 break; 2370 default: 2371 dev_dbg(dummy_dev(dum_hcd), 2372 "hub control req%04x v%04x i%04x l%d\n", 2373 typeReq, wValue, wIndex, wLength); 2374error: 2375 /* "protocol stall" on error */ 2376 retval = -EPIPE; 2377 } 2378 spin_unlock_irqrestore(&dum_hcd->dum->lock, flags); 2379 2380 if ((dum_hcd->port_status & PORT_C_MASK) != 0) 2381 usb_hcd_poll_rh_status(hcd); 2382 return retval; 2383} 2384 2385static int dummy_bus_suspend(struct usb_hcd *hcd) 2386{ 2387 struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd); 2388 2389 dev_dbg(&hcd->self.root_hub->dev, "%s\n", __func__); 2390 2391 spin_lock_irq(&dum_hcd->dum->lock); 2392 dum_hcd->rh_state = DUMMY_RH_SUSPENDED; 2393 set_link_state(dum_hcd); 2394 hcd->state = HC_STATE_SUSPENDED; 2395 spin_unlock_irq(&dum_hcd->dum->lock); 2396 return 0; 2397} 2398 2399static int dummy_bus_resume(struct usb_hcd *hcd) 2400{ 2401 struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd); 2402 int rc = 0; 2403 2404 dev_dbg(&hcd->self.root_hub->dev, "%s\n", __func__); 2405 2406 spin_lock_irq(&dum_hcd->dum->lock); 2407 if (!HCD_HW_ACCESSIBLE(hcd)) { 2408 rc = -ESHUTDOWN; 2409 } else { 2410 dum_hcd->rh_state = DUMMY_RH_RUNNING; 2411 set_link_state(dum_hcd); 2412 if (!list_empty(&dum_hcd->urbp_list)) { 2413 dum_hcd->timer_pending = 1; 2414 hrtimer_start(&dum_hcd->timer, ns_to_ktime(0), HRTIMER_MODE_REL_SOFT); 2415 } 2416 hcd->state = HC_STATE_RUNNING; 2417 } 2418 spin_unlock_irq(&dum_hcd->dum->lock); 2419 return rc; 2420} 2421 2422/*-------------------------------------------------------------------------*/ 2423 2424static inline ssize_t show_urb(char *buf, size_t size, struct urb *urb) 2425{ 2426 int ep = usb_pipeendpoint(urb->pipe); 2427 2428 return scnprintf(buf, size, 2429 "urb/%p %s ep%d%s%s len %d/%d\n", 2430 urb, 2431 ({ char *s; 2432 switch (urb->dev->speed) { 2433 case USB_SPEED_LOW: 2434 s = "ls"; 2435 break; 2436 case USB_SPEED_FULL: 2437 s = "fs"; 2438 break; 2439 case USB_SPEED_HIGH: 2440 s = "hs"; 2441 break; 2442 case USB_SPEED_SUPER: 2443 s = "ss"; 2444 break; 2445 default: 2446 s = "?"; 2447 break; 2448 } s; }), 2449 ep, ep ? (usb_urb_dir_in(urb) ? "in" : "out") : "", 2450 ({ char *s; \ 2451 switch (usb_pipetype(urb->pipe)) { \ 2452 case PIPE_CONTROL: \ 2453 s = ""; \ 2454 break; \ 2455 case PIPE_BULK: \ 2456 s = "-bulk"; \ 2457 break; \ 2458 case PIPE_INTERRUPT: \ 2459 s = "-int"; \ 2460 break; \ 2461 default: \ 2462 s = "-iso"; \ 2463 break; \ 2464 } s; }), 2465 urb->actual_length, urb->transfer_buffer_length); 2466} 2467 2468static ssize_t urbs_show(struct device *dev, struct device_attribute *attr, 2469 char *buf) 2470{ 2471 struct usb_hcd *hcd = dev_get_drvdata(dev); 2472 struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd); 2473 struct urbp *urbp; 2474 size_t size = 0; 2475 unsigned long flags; 2476 2477 spin_lock_irqsave(&dum_hcd->dum->lock, flags); 2478 list_for_each_entry(urbp, &dum_hcd->urbp_list, urbp_list) { 2479 size_t temp; 2480 2481 temp = show_urb(buf, PAGE_SIZE - size, urbp->urb); 2482 buf += temp; 2483 size += temp; 2484 } 2485 spin_unlock_irqrestore(&dum_hcd->dum->lock, flags); 2486 2487 return size; 2488} 2489static DEVICE_ATTR_RO(urbs); 2490 2491static int dummy_start_ss(struct dummy_hcd *dum_hcd) 2492{ 2493 hrtimer_setup(&dum_hcd->timer, dummy_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL_SOFT); 2494 dum_hcd->rh_state = DUMMY_RH_RUNNING; 2495 dum_hcd->stream_en_ep = 0; 2496 INIT_LIST_HEAD(&dum_hcd->urbp_list); 2497 dummy_hcd_to_hcd(dum_hcd)->power_budget = POWER_BUDGET_3; 2498 dummy_hcd_to_hcd(dum_hcd)->state = HC_STATE_RUNNING; 2499 dummy_hcd_to_hcd(dum_hcd)->uses_new_polling = 1; 2500#ifdef CONFIG_USB_OTG 2501 dummy_hcd_to_hcd(dum_hcd)->self.otg_port = 1; 2502#endif 2503 return 0; 2504 2505 /* FIXME 'urbs' should be a per-device thing, maybe in usbcore */ 2506 return device_create_file(dummy_dev(dum_hcd), &dev_attr_urbs); 2507} 2508 2509static int dummy_start(struct usb_hcd *hcd) 2510{ 2511 struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd); 2512 2513 /* 2514 * HOST side init ... we emulate a root hub that'll only ever 2515 * talk to one device (the gadget side). Also appears in sysfs, 2516 * just like more familiar pci-based HCDs. 2517 */ 2518 if (!usb_hcd_is_primary_hcd(hcd)) 2519 return dummy_start_ss(dum_hcd); 2520 2521 spin_lock_init(&dum_hcd->dum->lock); 2522 hrtimer_setup(&dum_hcd->timer, dummy_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL_SOFT); 2523 dum_hcd->rh_state = DUMMY_RH_RUNNING; 2524 2525 INIT_LIST_HEAD(&dum_hcd->urbp_list); 2526 2527 hcd->power_budget = POWER_BUDGET; 2528 hcd->state = HC_STATE_RUNNING; 2529 hcd->uses_new_polling = 1; 2530 2531#ifdef CONFIG_USB_OTG 2532 hcd->self.otg_port = 1; 2533#endif 2534 2535 /* FIXME 'urbs' should be a per-device thing, maybe in usbcore */ 2536 return device_create_file(dummy_dev(dum_hcd), &dev_attr_urbs); 2537} 2538 2539static void dummy_stop(struct usb_hcd *hcd) 2540{ 2541 struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd); 2542 2543 hrtimer_cancel(&dum_hcd->timer); 2544 dum_hcd->timer_pending = 0; 2545 device_remove_file(dummy_dev(dum_hcd), &dev_attr_urbs); 2546 dev_info(dummy_dev(dum_hcd), "stopped\n"); 2547} 2548 2549/*-------------------------------------------------------------------------*/ 2550 2551static int dummy_h_get_frame(struct usb_hcd *hcd) 2552{ 2553 return dummy_g_get_frame(NULL); 2554} 2555 2556static int dummy_setup(struct usb_hcd *hcd) 2557{ 2558 struct dummy *dum; 2559 2560 dum = *((void **)dev_get_platdata(hcd->self.controller)); 2561 hcd->self.sg_tablesize = ~0; 2562 if (usb_hcd_is_primary_hcd(hcd)) { 2563 dum->hs_hcd = hcd_to_dummy_hcd(hcd); 2564 dum->hs_hcd->dum = dum; 2565 /* 2566 * Mark the first roothub as being USB 2.0. 2567 * The USB 3.0 roothub will be registered later by 2568 * dummy_hcd_probe() 2569 */ 2570 hcd->speed = HCD_USB2; 2571 hcd->self.root_hub->speed = USB_SPEED_HIGH; 2572 } else { 2573 dum->ss_hcd = hcd_to_dummy_hcd(hcd); 2574 dum->ss_hcd->dum = dum; 2575 hcd->speed = HCD_USB3; 2576 hcd->self.root_hub->speed = USB_SPEED_SUPER; 2577 } 2578 return 0; 2579} 2580 2581/* Change a group of bulk endpoints to support multiple stream IDs */ 2582static int dummy_alloc_streams(struct usb_hcd *hcd, struct usb_device *udev, 2583 struct usb_host_endpoint **eps, unsigned int num_eps, 2584 unsigned int num_streams, gfp_t mem_flags) 2585{ 2586 struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd); 2587 unsigned long flags; 2588 int max_stream; 2589 int ret_streams = num_streams; 2590 unsigned int index; 2591 unsigned int i; 2592 2593 if (!num_eps) 2594 return -EINVAL; 2595 2596 spin_lock_irqsave(&dum_hcd->dum->lock, flags); 2597 for (i = 0; i < num_eps; i++) { 2598 index = dummy_get_ep_idx(&eps[i]->desc); 2599 if ((1 << index) & dum_hcd->stream_en_ep) { 2600 ret_streams = -EINVAL; 2601 goto out; 2602 } 2603 max_stream = usb_ss_max_streams(&eps[i]->ss_ep_comp); 2604 if (!max_stream) { 2605 ret_streams = -EINVAL; 2606 goto out; 2607 } 2608 if (max_stream < ret_streams) { 2609 dev_dbg(dummy_dev(dum_hcd), "Ep 0x%x only supports %u " 2610 "stream IDs.\n", 2611 eps[i]->desc.bEndpointAddress, 2612 max_stream); 2613 ret_streams = max_stream; 2614 } 2615 } 2616 2617 for (i = 0; i < num_eps; i++) { 2618 index = dummy_get_ep_idx(&eps[i]->desc); 2619 dum_hcd->stream_en_ep |= 1 << index; 2620 set_max_streams_for_pipe(dum_hcd, 2621 usb_endpoint_num(&eps[i]->desc), ret_streams); 2622 } 2623out: 2624 spin_unlock_irqrestore(&dum_hcd->dum->lock, flags); 2625 return ret_streams; 2626} 2627 2628/* Reverts a group of bulk endpoints back to not using stream IDs. */ 2629static int dummy_free_streams(struct usb_hcd *hcd, struct usb_device *udev, 2630 struct usb_host_endpoint **eps, unsigned int num_eps, 2631 gfp_t mem_flags) 2632{ 2633 struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd); 2634 unsigned long flags; 2635 int ret; 2636 unsigned int index; 2637 unsigned int i; 2638 2639 spin_lock_irqsave(&dum_hcd->dum->lock, flags); 2640 for (i = 0; i < num_eps; i++) { 2641 index = dummy_get_ep_idx(&eps[i]->desc); 2642 if (!((1 << index) & dum_hcd->stream_en_ep)) { 2643 ret = -EINVAL; 2644 goto out; 2645 } 2646 } 2647 2648 for (i = 0; i < num_eps; i++) { 2649 index = dummy_get_ep_idx(&eps[i]->desc); 2650 dum_hcd->stream_en_ep &= ~(1 << index); 2651 set_max_streams_for_pipe(dum_hcd, 2652 usb_endpoint_num(&eps[i]->desc), 0); 2653 } 2654 ret = 0; 2655out: 2656 spin_unlock_irqrestore(&dum_hcd->dum->lock, flags); 2657 return ret; 2658} 2659 2660static struct hc_driver dummy_hcd = { 2661 .description = (char *) driver_name, 2662 .product_desc = "Dummy host controller", 2663 .hcd_priv_size = sizeof(struct dummy_hcd), 2664 2665 .reset = dummy_setup, 2666 .start = dummy_start, 2667 .stop = dummy_stop, 2668 2669 .urb_enqueue = dummy_urb_enqueue, 2670 .urb_dequeue = dummy_urb_dequeue, 2671 2672 .get_frame_number = dummy_h_get_frame, 2673 2674 .hub_status_data = dummy_hub_status, 2675 .hub_control = dummy_hub_control, 2676 .bus_suspend = dummy_bus_suspend, 2677 .bus_resume = dummy_bus_resume, 2678 2679 .alloc_streams = dummy_alloc_streams, 2680 .free_streams = dummy_free_streams, 2681}; 2682 2683static int dummy_hcd_probe(struct platform_device *pdev) 2684{ 2685 struct dummy *dum; 2686 struct usb_hcd *hs_hcd; 2687 struct usb_hcd *ss_hcd; 2688 int retval; 2689 2690 dev_info(&pdev->dev, "%s, driver " DRIVER_VERSION "\n", driver_desc); 2691 dum = *((void **)dev_get_platdata(&pdev->dev)); 2692 2693 if (mod_data.is_super_speed) 2694 dummy_hcd.flags = HCD_USB3 | HCD_SHARED; 2695 else if (mod_data.is_high_speed) 2696 dummy_hcd.flags = HCD_USB2; 2697 else 2698 dummy_hcd.flags = HCD_USB11; 2699 hs_hcd = usb_create_hcd(&dummy_hcd, &pdev->dev, dev_name(&pdev->dev)); 2700 if (!hs_hcd) 2701 return -ENOMEM; 2702 hs_hcd->has_tt = 1; 2703 2704 retval = usb_add_hcd(hs_hcd, 0, 0); 2705 if (retval) 2706 goto put_usb2_hcd; 2707 2708 if (mod_data.is_super_speed) { 2709 ss_hcd = usb_create_shared_hcd(&dummy_hcd, &pdev->dev, 2710 dev_name(&pdev->dev), hs_hcd); 2711 if (!ss_hcd) { 2712 retval = -ENOMEM; 2713 goto dealloc_usb2_hcd; 2714 } 2715 2716 retval = usb_add_hcd(ss_hcd, 0, 0); 2717 if (retval) 2718 goto put_usb3_hcd; 2719 } 2720 return 0; 2721 2722put_usb3_hcd: 2723 usb_put_hcd(ss_hcd); 2724dealloc_usb2_hcd: 2725 usb_remove_hcd(hs_hcd); 2726put_usb2_hcd: 2727 usb_put_hcd(hs_hcd); 2728 dum->hs_hcd = dum->ss_hcd = NULL; 2729 return retval; 2730} 2731 2732static void dummy_hcd_remove(struct platform_device *pdev) 2733{ 2734 struct dummy *dum; 2735 2736 dum = hcd_to_dummy_hcd(platform_get_drvdata(pdev))->dum; 2737 2738 if (dum->ss_hcd) { 2739 usb_remove_hcd(dummy_hcd_to_hcd(dum->ss_hcd)); 2740 usb_put_hcd(dummy_hcd_to_hcd(dum->ss_hcd)); 2741 } 2742 2743 usb_remove_hcd(dummy_hcd_to_hcd(dum->hs_hcd)); 2744 usb_put_hcd(dummy_hcd_to_hcd(dum->hs_hcd)); 2745 2746 dum->hs_hcd = NULL; 2747 dum->ss_hcd = NULL; 2748} 2749 2750static int dummy_hcd_suspend(struct platform_device *pdev, pm_message_t state) 2751{ 2752 struct usb_hcd *hcd; 2753 struct dummy_hcd *dum_hcd; 2754 int rc = 0; 2755 2756 dev_dbg(&pdev->dev, "%s\n", __func__); 2757 2758 hcd = platform_get_drvdata(pdev); 2759 dum_hcd = hcd_to_dummy_hcd(hcd); 2760 if (dum_hcd->rh_state == DUMMY_RH_RUNNING) { 2761 dev_warn(&pdev->dev, "Root hub isn't suspended!\n"); 2762 rc = -EBUSY; 2763 } else 2764 clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags); 2765 return rc; 2766} 2767 2768static int dummy_hcd_resume(struct platform_device *pdev) 2769{ 2770 struct usb_hcd *hcd; 2771 2772 dev_dbg(&pdev->dev, "%s\n", __func__); 2773 2774 hcd = platform_get_drvdata(pdev); 2775 set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags); 2776 usb_hcd_poll_rh_status(hcd); 2777 return 0; 2778} 2779 2780static struct platform_driver dummy_hcd_driver = { 2781 .probe = dummy_hcd_probe, 2782 .remove = dummy_hcd_remove, 2783 .suspend = dummy_hcd_suspend, 2784 .resume = dummy_hcd_resume, 2785 .driver = { 2786 .name = driver_name, 2787 }, 2788}; 2789 2790/*-------------------------------------------------------------------------*/ 2791#define MAX_NUM_UDC 32 2792static struct platform_device *the_udc_pdev[MAX_NUM_UDC]; 2793static struct platform_device *the_hcd_pdev[MAX_NUM_UDC]; 2794 2795static int __init dummy_hcd_init(void) 2796{ 2797 int retval = -ENOMEM; 2798 int i; 2799 struct dummy *dum[MAX_NUM_UDC] = {}; 2800 2801 if (usb_disabled()) 2802 return -ENODEV; 2803 2804 if (!mod_data.is_high_speed && mod_data.is_super_speed) 2805 return -EINVAL; 2806 2807 if (mod_data.num < 1 || mod_data.num > MAX_NUM_UDC) { 2808 pr_err("Number of emulated UDC must be in range of 1...%d\n", 2809 MAX_NUM_UDC); 2810 return -EINVAL; 2811 } 2812 2813 for (i = 0; i < mod_data.num; i++) { 2814 the_hcd_pdev[i] = platform_device_alloc(driver_name, i); 2815 if (!the_hcd_pdev[i]) { 2816 i--; 2817 while (i >= 0) 2818 platform_device_put(the_hcd_pdev[i--]); 2819 return retval; 2820 } 2821 } 2822 for (i = 0; i < mod_data.num; i++) { 2823 the_udc_pdev[i] = platform_device_alloc(gadget_name, i); 2824 if (!the_udc_pdev[i]) { 2825 i--; 2826 while (i >= 0) 2827 platform_device_put(the_udc_pdev[i--]); 2828 goto err_alloc_udc; 2829 } 2830 } 2831 for (i = 0; i < mod_data.num; i++) { 2832 dum[i] = kzalloc(sizeof(struct dummy), GFP_KERNEL); 2833 if (!dum[i]) { 2834 retval = -ENOMEM; 2835 goto err_add_pdata; 2836 } 2837 retval = platform_device_add_data(the_hcd_pdev[i], &dum[i], 2838 sizeof(void *)); 2839 if (retval) 2840 goto err_add_pdata; 2841 retval = platform_device_add_data(the_udc_pdev[i], &dum[i], 2842 sizeof(void *)); 2843 if (retval) 2844 goto err_add_pdata; 2845 } 2846 2847 retval = platform_driver_register(&dummy_hcd_driver); 2848 if (retval < 0) 2849 goto err_add_pdata; 2850 retval = platform_driver_register(&dummy_udc_driver); 2851 if (retval < 0) 2852 goto err_register_udc_driver; 2853 2854 for (i = 0; i < mod_data.num; i++) { 2855 retval = platform_device_add(the_hcd_pdev[i]); 2856 if (retval < 0) { 2857 i--; 2858 while (i >= 0) 2859 platform_device_del(the_hcd_pdev[i--]); 2860 goto err_add_hcd; 2861 } 2862 } 2863 for (i = 0; i < mod_data.num; i++) { 2864 if (!dum[i]->hs_hcd || 2865 (!dum[i]->ss_hcd && mod_data.is_super_speed)) { 2866 /* 2867 * The hcd was added successfully but its probe 2868 * function failed for some reason. 2869 */ 2870 retval = -EINVAL; 2871 goto err_add_udc; 2872 } 2873 } 2874 2875 for (i = 0; i < mod_data.num; i++) { 2876 retval = platform_device_add(the_udc_pdev[i]); 2877 if (retval < 0) { 2878 i--; 2879 while (i >= 0) 2880 platform_device_del(the_udc_pdev[i--]); 2881 goto err_add_udc; 2882 } 2883 } 2884 2885 for (i = 0; i < mod_data.num; i++) { 2886 if (!platform_get_drvdata(the_udc_pdev[i])) { 2887 /* 2888 * The udc was added successfully but its probe 2889 * function failed for some reason. 2890 */ 2891 retval = -EINVAL; 2892 goto err_probe_udc; 2893 } 2894 } 2895 return retval; 2896 2897err_probe_udc: 2898 for (i = 0; i < mod_data.num; i++) 2899 platform_device_del(the_udc_pdev[i]); 2900err_add_udc: 2901 for (i = 0; i < mod_data.num; i++) 2902 platform_device_del(the_hcd_pdev[i]); 2903err_add_hcd: 2904 platform_driver_unregister(&dummy_udc_driver); 2905err_register_udc_driver: 2906 platform_driver_unregister(&dummy_hcd_driver); 2907err_add_pdata: 2908 for (i = 0; i < mod_data.num; i++) 2909 kfree(dum[i]); 2910 for (i = 0; i < mod_data.num; i++) 2911 platform_device_put(the_udc_pdev[i]); 2912err_alloc_udc: 2913 for (i = 0; i < mod_data.num; i++) 2914 platform_device_put(the_hcd_pdev[i]); 2915 return retval; 2916} 2917module_init(dummy_hcd_init); 2918 2919static void __exit dummy_hcd_cleanup(void) 2920{ 2921 int i; 2922 2923 for (i = 0; i < mod_data.num; i++) { 2924 struct dummy *dum; 2925 2926 dum = *((void **)dev_get_platdata(&the_udc_pdev[i]->dev)); 2927 2928 platform_device_unregister(the_udc_pdev[i]); 2929 platform_device_unregister(the_hcd_pdev[i]); 2930 kfree(dum); 2931 } 2932 platform_driver_unregister(&dummy_udc_driver); 2933 platform_driver_unregister(&dummy_hcd_driver); 2934} 2935module_exit(dummy_hcd_cleanup);
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