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 (slave); 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("ep3out", 191 USB_EP_CAPS(TYPE_BULK_OR_INT, USB_EP_CAPS_DIR_OUT)), 192 EP_INFO("ep4in", 193 USB_EP_CAPS(TYPE_BULK_OR_INT, USB_EP_CAPS_DIR_IN)), 194 EP_INFO("ep5out", 195 USB_EP_CAPS(TYPE_BULK_OR_INT, USB_EP_CAPS_DIR_OUT)), 196 EP_INFO("ep6out", 197 USB_EP_CAPS(TYPE_BULK_OR_INT, USB_EP_CAPS_DIR_OUT)), 198 EP_INFO("ep7in", 199 USB_EP_CAPS(TYPE_BULK_OR_INT, USB_EP_CAPS_DIR_IN)), 200 EP_INFO("ep8out", 201 USB_EP_CAPS(TYPE_BULK_OR_INT, USB_EP_CAPS_DIR_OUT)), 202 EP_INFO("ep9in", 203 USB_EP_CAPS(TYPE_BULK_OR_INT, USB_EP_CAPS_DIR_IN)), 204 EP_INFO("ep10out", 205 USB_EP_CAPS(TYPE_BULK_OR_INT, USB_EP_CAPS_DIR_OUT)), 206 EP_INFO("ep11out", 207 USB_EP_CAPS(TYPE_BULK_OR_INT, USB_EP_CAPS_DIR_OUT)), 208 EP_INFO("ep12in", 209 USB_EP_CAPS(TYPE_BULK_OR_INT, USB_EP_CAPS_DIR_IN)), 210 EP_INFO("ep13out", 211 USB_EP_CAPS(TYPE_BULK_OR_INT, USB_EP_CAPS_DIR_OUT)), 212 EP_INFO("ep14in", 213 USB_EP_CAPS(TYPE_BULK_OR_INT, USB_EP_CAPS_DIR_IN)), 214 EP_INFO("ep15out", 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 * SLAVE/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 * MASTER/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 /* SLAVE/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 { 431 struct dummy *dum = dum_hcd->dum; 432 unsigned int power_bit; 433 434 dum_hcd->active = 0; 435 if (dum->pullup) 436 if ((dummy_hcd_to_hcd(dum_hcd)->speed == HCD_USB3 && 437 dum->gadget.speed != USB_SPEED_SUPER) || 438 (dummy_hcd_to_hcd(dum_hcd)->speed != HCD_USB3 && 439 dum->gadget.speed == USB_SPEED_SUPER)) 440 return; 441 442 set_link_state_by_speed(dum_hcd); 443 power_bit = (dummy_hcd_to_hcd(dum_hcd)->speed == HCD_USB3 ? 444 USB_SS_PORT_STAT_POWER : USB_PORT_STAT_POWER); 445 446 if ((dum_hcd->port_status & USB_PORT_STAT_ENABLE) == 0 || 447 dum_hcd->active) 448 dum_hcd->resuming = 0; 449 450 /* Currently !connected or in reset */ 451 if ((dum_hcd->port_status & power_bit) == 0 || 452 (dum_hcd->port_status & USB_PORT_STAT_RESET) != 0) { 453 unsigned int disconnect = power_bit & 454 dum_hcd->old_status & (~dum_hcd->port_status); 455 unsigned int reset = USB_PORT_STAT_RESET & 456 (~dum_hcd->old_status) & dum_hcd->port_status; 457 458 /* Report reset and disconnect events to the driver */ 459 if (dum->ints_enabled && (disconnect || reset)) { 460 stop_activity(dum); 461 ++dum->callback_usage; 462 spin_unlock(&dum->lock); 463 if (reset) 464 usb_gadget_udc_reset(&dum->gadget, dum->driver); 465 else 466 dum->driver->disconnect(&dum->gadget); 467 spin_lock(&dum->lock); 468 --dum->callback_usage; 469 } 470 } else if (dum_hcd->active != dum_hcd->old_active && 471 dum->ints_enabled) { 472 ++dum->callback_usage; 473 spin_unlock(&dum->lock); 474 if (dum_hcd->old_active && dum->driver->suspend) 475 dum->driver->suspend(&dum->gadget); 476 else if (!dum_hcd->old_active && dum->driver->resume) 477 dum->driver->resume(&dum->gadget); 478 spin_lock(&dum->lock); 479 --dum->callback_usage; 480 } 481 482 dum_hcd->old_status = dum_hcd->port_status; 483 dum_hcd->old_active = dum_hcd->active; 484 } 485 486 /*-------------------------------------------------------------------------*/ 487 488 /* SLAVE/GADGET SIDE DRIVER 489 * 490 * This only tracks gadget state. All the work is done when the host 491 * side tries some (emulated) i/o operation. Real device controller 492 * drivers would do real i/o using dma, fifos, irqs, timers, etc. 493 */ 494 495 #define is_enabled(dum) \ 496 (dum->port_status & USB_PORT_STAT_ENABLE) 497 498 static int dummy_enable(struct usb_ep *_ep, 499 const struct usb_endpoint_descriptor *desc) 500 { 501 struct dummy *dum; 502 struct dummy_hcd *dum_hcd; 503 struct dummy_ep *ep; 504 unsigned max; 505 int retval; 506 507 ep = usb_ep_to_dummy_ep(_ep); 508 if (!_ep || !desc || ep->desc || _ep->name == ep0name 509 || desc->bDescriptorType != USB_DT_ENDPOINT) 510 return -EINVAL; 511 dum = ep_to_dummy(ep); 512 if (!dum->driver) 513 return -ESHUTDOWN; 514 515 dum_hcd = gadget_to_dummy_hcd(&dum->gadget); 516 if (!is_enabled(dum_hcd)) 517 return -ESHUTDOWN; 518 519 /* 520 * For HS/FS devices only bits 0..10 of the wMaxPacketSize represent the 521 * maximum packet size. 522 * For SS devices the wMaxPacketSize is limited by 1024. 523 */ 524 max = usb_endpoint_maxp(desc); 525 526 /* drivers must not request bad settings, since lower levels 527 * (hardware or its drivers) may not check. some endpoints 528 * can't do iso, many have maxpacket limitations, etc. 529 * 530 * since this "hardware" driver is here to help debugging, we 531 * have some extra sanity checks. (there could be more though, 532 * especially for "ep9out" style fixed function ones.) 533 */ 534 retval = -EINVAL; 535 switch (usb_endpoint_type(desc)) { 536 case USB_ENDPOINT_XFER_BULK: 537 if (strstr(ep->ep.name, "-iso") 538 || strstr(ep->ep.name, "-int")) { 539 goto done; 540 } 541 switch (dum->gadget.speed) { 542 case USB_SPEED_SUPER: 543 if (max == 1024) 544 break; 545 goto done; 546 case USB_SPEED_HIGH: 547 if (max == 512) 548 break; 549 goto done; 550 case USB_SPEED_FULL: 551 if (max == 8 || max == 16 || max == 32 || max == 64) 552 /* we'll fake any legal size */ 553 break; 554 /* save a return statement */ 555 default: 556 goto done; 557 } 558 break; 559 case USB_ENDPOINT_XFER_INT: 560 if (strstr(ep->ep.name, "-iso")) /* bulk is ok */ 561 goto done; 562 /* real hardware might not handle all packet sizes */ 563 switch (dum->gadget.speed) { 564 case USB_SPEED_SUPER: 565 case USB_SPEED_HIGH: 566 if (max <= 1024) 567 break; 568 /* save a return statement */ 569 /* fall through */ 570 case USB_SPEED_FULL: 571 if (max <= 64) 572 break; 573 /* save a return statement */ 574 /* fall through */ 575 default: 576 if (max <= 8) 577 break; 578 goto done; 579 } 580 break; 581 case USB_ENDPOINT_XFER_ISOC: 582 if (strstr(ep->ep.name, "-bulk") 583 || strstr(ep->ep.name, "-int")) 584 goto done; 585 /* real hardware might not handle all packet sizes */ 586 switch (dum->gadget.speed) { 587 case USB_SPEED_SUPER: 588 case USB_SPEED_HIGH: 589 if (max <= 1024) 590 break; 591 /* save a return statement */ 592 /* fall through */ 593 case USB_SPEED_FULL: 594 if (max <= 1023) 595 break; 596 /* save a return statement */ 597 default: 598 goto done; 599 } 600 break; 601 default: 602 /* few chips support control except on ep0 */ 603 goto done; 604 } 605 606 _ep->maxpacket = max; 607 if (usb_ss_max_streams(_ep->comp_desc)) { 608 if (!usb_endpoint_xfer_bulk(desc)) { 609 dev_err(udc_dev(dum), "Can't enable stream support on " 610 "non-bulk ep %s\n", _ep->name); 611 return -EINVAL; 612 } 613 ep->stream_en = 1; 614 } 615 ep->desc = desc; 616 617 dev_dbg(udc_dev(dum), "enabled %s (ep%d%s-%s) maxpacket %d stream %s\n", 618 _ep->name, 619 desc->bEndpointAddress & 0x0f, 620 (desc->bEndpointAddress & USB_DIR_IN) ? "in" : "out", 621 usb_ep_type_string(usb_endpoint_type(desc)), 622 max, ep->stream_en ? "enabled" : "disabled"); 623 624 /* at this point real hardware should be NAKing transfers 625 * to that endpoint, until a buffer is queued to it. 626 */ 627 ep->halted = ep->wedged = 0; 628 retval = 0; 629 done: 630 return retval; 631 } 632 633 static int dummy_disable(struct usb_ep *_ep) 634 { 635 struct dummy_ep *ep; 636 struct dummy *dum; 637 unsigned long flags; 638 639 ep = usb_ep_to_dummy_ep(_ep); 640 if (!_ep || !ep->desc || _ep->name == ep0name) 641 return -EINVAL; 642 dum = ep_to_dummy(ep); 643 644 spin_lock_irqsave(&dum->lock, flags); 645 ep->desc = NULL; 646 ep->stream_en = 0; 647 nuke(dum, ep); 648 spin_unlock_irqrestore(&dum->lock, flags); 649 650 dev_dbg(udc_dev(dum), "disabled %s\n", _ep->name); 651 return 0; 652 } 653 654 static struct usb_request *dummy_alloc_request(struct usb_ep *_ep, 655 gfp_t mem_flags) 656 { 657 struct dummy_request *req; 658 659 if (!_ep) 660 return NULL; 661 662 req = kzalloc(sizeof(*req), mem_flags); 663 if (!req) 664 return NULL; 665 INIT_LIST_HEAD(&req->queue); 666 return &req->req; 667 } 668 669 static void dummy_free_request(struct usb_ep *_ep, struct usb_request *_req) 670 { 671 struct dummy_request *req; 672 673 if (!_ep || !_req) { 674 WARN_ON(1); 675 return; 676 } 677 678 req = usb_request_to_dummy_request(_req); 679 WARN_ON(!list_empty(&req->queue)); 680 kfree(req); 681 } 682 683 static void fifo_complete(struct usb_ep *ep, struct usb_request *req) 684 { 685 } 686 687 static int dummy_queue(struct usb_ep *_ep, struct usb_request *_req, 688 gfp_t mem_flags) 689 { 690 struct dummy_ep *ep; 691 struct dummy_request *req; 692 struct dummy *dum; 693 struct dummy_hcd *dum_hcd; 694 unsigned long flags; 695 696 req = usb_request_to_dummy_request(_req); 697 if (!_req || !list_empty(&req->queue) || !_req->complete) 698 return -EINVAL; 699 700 ep = usb_ep_to_dummy_ep(_ep); 701 if (!_ep || (!ep->desc && _ep->name != ep0name)) 702 return -EINVAL; 703 704 dum = ep_to_dummy(ep); 705 dum_hcd = gadget_to_dummy_hcd(&dum->gadget); 706 if (!dum->driver || !is_enabled(dum_hcd)) 707 return -ESHUTDOWN; 708 709 #if 0 710 dev_dbg(udc_dev(dum), "ep %p queue req %p to %s, len %d buf %p\n", 711 ep, _req, _ep->name, _req->length, _req->buf); 712 #endif 713 _req->status = -EINPROGRESS; 714 _req->actual = 0; 715 spin_lock_irqsave(&dum->lock, flags); 716 717 /* implement an emulated single-request FIFO */ 718 if (ep->desc && (ep->desc->bEndpointAddress & USB_DIR_IN) && 719 list_empty(&dum->fifo_req.queue) && 720 list_empty(&ep->queue) && 721 _req->length <= FIFO_SIZE) { 722 req = &dum->fifo_req; 723 req->req = *_req; 724 req->req.buf = dum->fifo_buf; 725 memcpy(dum->fifo_buf, _req->buf, _req->length); 726 req->req.context = dum; 727 req->req.complete = fifo_complete; 728 729 list_add_tail(&req->queue, &ep->queue); 730 spin_unlock(&dum->lock); 731 _req->actual = _req->length; 732 _req->status = 0; 733 usb_gadget_giveback_request(_ep, _req); 734 spin_lock(&dum->lock); 735 } else 736 list_add_tail(&req->queue, &ep->queue); 737 spin_unlock_irqrestore(&dum->lock, flags); 738 739 /* real hardware would likely enable transfers here, in case 740 * it'd been left NAKing. 741 */ 742 return 0; 743 } 744 745 static int dummy_dequeue(struct usb_ep *_ep, struct usb_request *_req) 746 { 747 struct dummy_ep *ep; 748 struct dummy *dum; 749 int retval = -EINVAL; 750 unsigned long flags; 751 struct dummy_request *req = NULL; 752 753 if (!_ep || !_req) 754 return retval; 755 ep = usb_ep_to_dummy_ep(_ep); 756 dum = ep_to_dummy(ep); 757 758 if (!dum->driver) 759 return -ESHUTDOWN; 760 761 local_irq_save(flags); 762 spin_lock(&dum->lock); 763 list_for_each_entry(req, &ep->queue, queue) { 764 if (&req->req == _req) { 765 list_del_init(&req->queue); 766 _req->status = -ECONNRESET; 767 retval = 0; 768 break; 769 } 770 } 771 spin_unlock(&dum->lock); 772 773 if (retval == 0) { 774 dev_dbg(udc_dev(dum), 775 "dequeued req %p from %s, len %d buf %p\n", 776 req, _ep->name, _req->length, _req->buf); 777 usb_gadget_giveback_request(_ep, _req); 778 } 779 local_irq_restore(flags); 780 return retval; 781 } 782 783 static int 784 dummy_set_halt_and_wedge(struct usb_ep *_ep, int value, int wedged) 785 { 786 struct dummy_ep *ep; 787 struct dummy *dum; 788 789 if (!_ep) 790 return -EINVAL; 791 ep = usb_ep_to_dummy_ep(_ep); 792 dum = ep_to_dummy(ep); 793 if (!dum->driver) 794 return -ESHUTDOWN; 795 if (!value) 796 ep->halted = ep->wedged = 0; 797 else if (ep->desc && (ep->desc->bEndpointAddress & USB_DIR_IN) && 798 !list_empty(&ep->queue)) 799 return -EAGAIN; 800 else { 801 ep->halted = 1; 802 if (wedged) 803 ep->wedged = 1; 804 } 805 /* FIXME clear emulated data toggle too */ 806 return 0; 807 } 808 809 static int 810 dummy_set_halt(struct usb_ep *_ep, int value) 811 { 812 return dummy_set_halt_and_wedge(_ep, value, 0); 813 } 814 815 static int dummy_set_wedge(struct usb_ep *_ep) 816 { 817 if (!_ep || _ep->name == ep0name) 818 return -EINVAL; 819 return dummy_set_halt_and_wedge(_ep, 1, 1); 820 } 821 822 static const struct usb_ep_ops dummy_ep_ops = { 823 .enable = dummy_enable, 824 .disable = dummy_disable, 825 826 .alloc_request = dummy_alloc_request, 827 .free_request = dummy_free_request, 828 829 .queue = dummy_queue, 830 .dequeue = dummy_dequeue, 831 832 .set_halt = dummy_set_halt, 833 .set_wedge = dummy_set_wedge, 834 }; 835 836 /*-------------------------------------------------------------------------*/ 837 838 /* there are both host and device side versions of this call ... */ 839 static int dummy_g_get_frame(struct usb_gadget *_gadget) 840 { 841 struct timespec64 ts64; 842 843 ktime_get_ts64(&ts64); 844 return ts64.tv_nsec / NSEC_PER_MSEC; 845 } 846 847 static int dummy_wakeup(struct usb_gadget *_gadget) 848 { 849 struct dummy_hcd *dum_hcd; 850 851 dum_hcd = gadget_to_dummy_hcd(_gadget); 852 if (!(dum_hcd->dum->devstatus & ((1 << USB_DEVICE_B_HNP_ENABLE) 853 | (1 << USB_DEVICE_REMOTE_WAKEUP)))) 854 return -EINVAL; 855 if ((dum_hcd->port_status & USB_PORT_STAT_CONNECTION) == 0) 856 return -ENOLINK; 857 if ((dum_hcd->port_status & USB_PORT_STAT_SUSPEND) == 0 && 858 dum_hcd->rh_state != DUMMY_RH_SUSPENDED) 859 return -EIO; 860 861 /* FIXME: What if the root hub is suspended but the port isn't? */ 862 863 /* hub notices our request, issues downstream resume, etc */ 864 dum_hcd->resuming = 1; 865 dum_hcd->re_timeout = jiffies + msecs_to_jiffies(20); 866 mod_timer(&dummy_hcd_to_hcd(dum_hcd)->rh_timer, dum_hcd->re_timeout); 867 return 0; 868 } 869 870 static int dummy_set_selfpowered(struct usb_gadget *_gadget, int value) 871 { 872 struct dummy *dum; 873 874 _gadget->is_selfpowered = (value != 0); 875 dum = gadget_to_dummy_hcd(_gadget)->dum; 876 if (value) 877 dum->devstatus |= (1 << USB_DEVICE_SELF_POWERED); 878 else 879 dum->devstatus &= ~(1 << USB_DEVICE_SELF_POWERED); 880 return 0; 881 } 882 883 static void dummy_udc_update_ep0(struct dummy *dum) 884 { 885 if (dum->gadget.speed == USB_SPEED_SUPER) 886 dum->ep[0].ep.maxpacket = 9; 887 else 888 dum->ep[0].ep.maxpacket = 64; 889 } 890 891 static int dummy_pullup(struct usb_gadget *_gadget, int value) 892 { 893 struct dummy_hcd *dum_hcd; 894 struct dummy *dum; 895 unsigned long flags; 896 897 dum = gadget_dev_to_dummy(&_gadget->dev); 898 dum_hcd = gadget_to_dummy_hcd(_gadget); 899 900 spin_lock_irqsave(&dum->lock, flags); 901 dum->pullup = (value != 0); 902 set_link_state(dum_hcd); 903 spin_unlock_irqrestore(&dum->lock, flags); 904 905 usb_hcd_poll_rh_status(dummy_hcd_to_hcd(dum_hcd)); 906 return 0; 907 } 908 909 static void dummy_udc_set_speed(struct usb_gadget *_gadget, 910 enum usb_device_speed speed) 911 { 912 struct dummy *dum; 913 914 dum = gadget_dev_to_dummy(&_gadget->dev); 915 dum->gadget.speed = speed; 916 dummy_udc_update_ep0(dum); 917 } 918 919 static int dummy_udc_start(struct usb_gadget *g, 920 struct usb_gadget_driver *driver); 921 static int dummy_udc_stop(struct usb_gadget *g); 922 923 static const struct usb_gadget_ops dummy_ops = { 924 .get_frame = dummy_g_get_frame, 925 .wakeup = dummy_wakeup, 926 .set_selfpowered = dummy_set_selfpowered, 927 .pullup = dummy_pullup, 928 .udc_start = dummy_udc_start, 929 .udc_stop = dummy_udc_stop, 930 .udc_set_speed = dummy_udc_set_speed, 931 }; 932 933 /*-------------------------------------------------------------------------*/ 934 935 /* "function" sysfs attribute */ 936 static ssize_t function_show(struct device *dev, struct device_attribute *attr, 937 char *buf) 938 { 939 struct dummy *dum = gadget_dev_to_dummy(dev); 940 941 if (!dum->driver || !dum->driver->function) 942 return 0; 943 return scnprintf(buf, PAGE_SIZE, "%s\n", dum->driver->function); 944 } 945 static DEVICE_ATTR_RO(function); 946 947 /*-------------------------------------------------------------------------*/ 948 949 /* 950 * Driver registration/unregistration. 951 * 952 * This is basically hardware-specific; there's usually only one real USB 953 * device (not host) controller since that's how USB devices are intended 954 * to work. So most implementations of these api calls will rely on the 955 * fact that only one driver will ever bind to the hardware. But curious 956 * hardware can be built with discrete components, so the gadget API doesn't 957 * require that assumption. 958 * 959 * For this emulator, it might be convenient to create a usb slave device 960 * for each driver that registers: just add to a big root hub. 961 */ 962 963 static int dummy_udc_start(struct usb_gadget *g, 964 struct usb_gadget_driver *driver) 965 { 966 struct dummy_hcd *dum_hcd = gadget_to_dummy_hcd(g); 967 struct dummy *dum = dum_hcd->dum; 968 969 switch (g->speed) { 970 /* All the speeds we support */ 971 case USB_SPEED_LOW: 972 case USB_SPEED_FULL: 973 case USB_SPEED_HIGH: 974 case USB_SPEED_SUPER: 975 break; 976 default: 977 dev_err(dummy_dev(dum_hcd), "Unsupported driver max speed %d\n", 978 driver->max_speed); 979 return -EINVAL; 980 } 981 982 /* 983 * SLAVE side init ... the layer above hardware, which 984 * can't enumerate without help from the driver we're binding. 985 */ 986 987 spin_lock_irq(&dum->lock); 988 dum->devstatus = 0; 989 dum->driver = driver; 990 dum->ints_enabled = 1; 991 spin_unlock_irq(&dum->lock); 992 993 return 0; 994 } 995 996 static int dummy_udc_stop(struct usb_gadget *g) 997 { 998 struct dummy_hcd *dum_hcd = gadget_to_dummy_hcd(g); 999 struct dummy *dum = dum_hcd->dum; 1000 1001 spin_lock_irq(&dum->lock); 1002 dum->ints_enabled = 0; 1003 stop_activity(dum); 1004 1005 /* emulate synchronize_irq(): wait for callbacks to finish */ 1006 while (dum->callback_usage > 0) { 1007 spin_unlock_irq(&dum->lock); 1008 usleep_range(1000, 2000); 1009 spin_lock_irq(&dum->lock); 1010 } 1011 1012 dum->driver = NULL; 1013 spin_unlock_irq(&dum->lock); 1014 1015 return 0; 1016 } 1017 1018 #undef is_enabled 1019 1020 /* The gadget structure is stored inside the hcd structure and will be 1021 * released along with it. */ 1022 static void init_dummy_udc_hw(struct dummy *dum) 1023 { 1024 int i; 1025 1026 INIT_LIST_HEAD(&dum->gadget.ep_list); 1027 for (i = 0; i < DUMMY_ENDPOINTS; i++) { 1028 struct dummy_ep *ep = &dum->ep[i]; 1029 1030 if (!ep_info[i].name) 1031 break; 1032 ep->ep.name = ep_info[i].name; 1033 ep->ep.caps = ep_info[i].caps; 1034 ep->ep.ops = &dummy_ep_ops; 1035 list_add_tail(&ep->ep.ep_list, &dum->gadget.ep_list); 1036 ep->halted = ep->wedged = ep->already_seen = 1037 ep->setup_stage = 0; 1038 usb_ep_set_maxpacket_limit(&ep->ep, ~0); 1039 ep->ep.max_streams = 16; 1040 ep->last_io = jiffies; 1041 ep->gadget = &dum->gadget; 1042 ep->desc = NULL; 1043 INIT_LIST_HEAD(&ep->queue); 1044 } 1045 1046 dum->gadget.ep0 = &dum->ep[0].ep; 1047 list_del_init(&dum->ep[0].ep.ep_list); 1048 INIT_LIST_HEAD(&dum->fifo_req.queue); 1049 1050 #ifdef CONFIG_USB_OTG 1051 dum->gadget.is_otg = 1; 1052 #endif 1053 } 1054 1055 static int dummy_udc_probe(struct platform_device *pdev) 1056 { 1057 struct dummy *dum; 1058 int rc; 1059 1060 dum = *((void **)dev_get_platdata(&pdev->dev)); 1061 /* Clear usb_gadget region for new registration to udc-core */ 1062 memzero_explicit(&dum->gadget, sizeof(struct usb_gadget)); 1063 dum->gadget.name = gadget_name; 1064 dum->gadget.ops = &dummy_ops; 1065 if (mod_data.is_super_speed) 1066 dum->gadget.max_speed = USB_SPEED_SUPER; 1067 else if (mod_data.is_high_speed) 1068 dum->gadget.max_speed = USB_SPEED_HIGH; 1069 else 1070 dum->gadget.max_speed = USB_SPEED_FULL; 1071 1072 dum->gadget.dev.parent = &pdev->dev; 1073 init_dummy_udc_hw(dum); 1074 1075 rc = usb_add_gadget_udc(&pdev->dev, &dum->gadget); 1076 if (rc < 0) 1077 goto err_udc; 1078 1079 rc = device_create_file(&dum->gadget.dev, &dev_attr_function); 1080 if (rc < 0) 1081 goto err_dev; 1082 platform_set_drvdata(pdev, dum); 1083 return rc; 1084 1085 err_dev: 1086 usb_del_gadget_udc(&dum->gadget); 1087 err_udc: 1088 return rc; 1089 } 1090 1091 static int dummy_udc_remove(struct platform_device *pdev) 1092 { 1093 struct dummy *dum = platform_get_drvdata(pdev); 1094 1095 device_remove_file(&dum->gadget.dev, &dev_attr_function); 1096 usb_del_gadget_udc(&dum->gadget); 1097 return 0; 1098 } 1099 1100 static void dummy_udc_pm(struct dummy *dum, struct dummy_hcd *dum_hcd, 1101 int suspend) 1102 { 1103 spin_lock_irq(&dum->lock); 1104 dum->udc_suspended = suspend; 1105 set_link_state(dum_hcd); 1106 spin_unlock_irq(&dum->lock); 1107 } 1108 1109 static int dummy_udc_suspend(struct platform_device *pdev, pm_message_t state) 1110 { 1111 struct dummy *dum = platform_get_drvdata(pdev); 1112 struct dummy_hcd *dum_hcd = gadget_to_dummy_hcd(&dum->gadget); 1113 1114 dev_dbg(&pdev->dev, "%s\n", __func__); 1115 dummy_udc_pm(dum, dum_hcd, 1); 1116 usb_hcd_poll_rh_status(dummy_hcd_to_hcd(dum_hcd)); 1117 return 0; 1118 } 1119 1120 static int dummy_udc_resume(struct platform_device *pdev) 1121 { 1122 struct dummy *dum = platform_get_drvdata(pdev); 1123 struct dummy_hcd *dum_hcd = gadget_to_dummy_hcd(&dum->gadget); 1124 1125 dev_dbg(&pdev->dev, "%s\n", __func__); 1126 dummy_udc_pm(dum, dum_hcd, 0); 1127 usb_hcd_poll_rh_status(dummy_hcd_to_hcd(dum_hcd)); 1128 return 0; 1129 } 1130 1131 static struct platform_driver dummy_udc_driver = { 1132 .probe = dummy_udc_probe, 1133 .remove = dummy_udc_remove, 1134 .suspend = dummy_udc_suspend, 1135 .resume = dummy_udc_resume, 1136 .driver = { 1137 .name = (char *) gadget_name, 1138 }, 1139 }; 1140 1141 /*-------------------------------------------------------------------------*/ 1142 1143 static unsigned int dummy_get_ep_idx(const struct usb_endpoint_descriptor *desc) 1144 { 1145 unsigned int index; 1146 1147 index = usb_endpoint_num(desc) << 1; 1148 if (usb_endpoint_dir_in(desc)) 1149 index |= 1; 1150 return index; 1151 } 1152 1153 /* MASTER/HOST SIDE DRIVER 1154 * 1155 * this uses the hcd framework to hook up to host side drivers. 1156 * its root hub will only have one device, otherwise it acts like 1157 * a normal host controller. 1158 * 1159 * when urbs are queued, they're just stuck on a list that we 1160 * scan in a timer callback. that callback connects writes from 1161 * the host with reads from the device, and so on, based on the 1162 * usb 2.0 rules. 1163 */ 1164 1165 static int dummy_ep_stream_en(struct dummy_hcd *dum_hcd, struct urb *urb) 1166 { 1167 const struct usb_endpoint_descriptor *desc = &urb->ep->desc; 1168 u32 index; 1169 1170 if (!usb_endpoint_xfer_bulk(desc)) 1171 return 0; 1172 1173 index = dummy_get_ep_idx(desc); 1174 return (1 << index) & dum_hcd->stream_en_ep; 1175 } 1176 1177 /* 1178 * The max stream number is saved as a nibble so for the 30 possible endpoints 1179 * we only 15 bytes of memory. Therefore we are limited to max 16 streams (0 1180 * means we use only 1 stream). The maximum according to the spec is 16bit so 1181 * if the 16 stream limit is about to go, the array size should be incremented 1182 * to 30 elements of type u16. 1183 */ 1184 static int get_max_streams_for_pipe(struct dummy_hcd *dum_hcd, 1185 unsigned int pipe) 1186 { 1187 int max_streams; 1188 1189 max_streams = dum_hcd->num_stream[usb_pipeendpoint(pipe)]; 1190 if (usb_pipeout(pipe)) 1191 max_streams >>= 4; 1192 else 1193 max_streams &= 0xf; 1194 max_streams++; 1195 return max_streams; 1196 } 1197 1198 static void set_max_streams_for_pipe(struct dummy_hcd *dum_hcd, 1199 unsigned int pipe, unsigned int streams) 1200 { 1201 int max_streams; 1202 1203 streams--; 1204 max_streams = dum_hcd->num_stream[usb_pipeendpoint(pipe)]; 1205 if (usb_pipeout(pipe)) { 1206 streams <<= 4; 1207 max_streams &= 0xf; 1208 } else { 1209 max_streams &= 0xf0; 1210 } 1211 max_streams |= streams; 1212 dum_hcd->num_stream[usb_pipeendpoint(pipe)] = max_streams; 1213 } 1214 1215 static int dummy_validate_stream(struct dummy_hcd *dum_hcd, struct urb *urb) 1216 { 1217 unsigned int max_streams; 1218 int enabled; 1219 1220 enabled = dummy_ep_stream_en(dum_hcd, urb); 1221 if (!urb->stream_id) { 1222 if (enabled) 1223 return -EINVAL; 1224 return 0; 1225 } 1226 if (!enabled) 1227 return -EINVAL; 1228 1229 max_streams = get_max_streams_for_pipe(dum_hcd, 1230 usb_pipeendpoint(urb->pipe)); 1231 if (urb->stream_id > max_streams) { 1232 dev_err(dummy_dev(dum_hcd), "Stream id %d is out of range.\n", 1233 urb->stream_id); 1234 BUG(); 1235 return -EINVAL; 1236 } 1237 return 0; 1238 } 1239 1240 static int dummy_urb_enqueue( 1241 struct usb_hcd *hcd, 1242 struct urb *urb, 1243 gfp_t mem_flags 1244 ) { 1245 struct dummy_hcd *dum_hcd; 1246 struct urbp *urbp; 1247 unsigned long flags; 1248 int rc; 1249 1250 urbp = kmalloc(sizeof *urbp, mem_flags); 1251 if (!urbp) 1252 return -ENOMEM; 1253 urbp->urb = urb; 1254 urbp->miter_started = 0; 1255 1256 dum_hcd = hcd_to_dummy_hcd(hcd); 1257 spin_lock_irqsave(&dum_hcd->dum->lock, flags); 1258 1259 rc = dummy_validate_stream(dum_hcd, urb); 1260 if (rc) { 1261 kfree(urbp); 1262 goto done; 1263 } 1264 1265 rc = usb_hcd_link_urb_to_ep(hcd, urb); 1266 if (rc) { 1267 kfree(urbp); 1268 goto done; 1269 } 1270 1271 if (!dum_hcd->udev) { 1272 dum_hcd->udev = urb->dev; 1273 usb_get_dev(dum_hcd->udev); 1274 } else if (unlikely(dum_hcd->udev != urb->dev)) 1275 dev_err(dummy_dev(dum_hcd), "usb_device address has changed!\n"); 1276 1277 list_add_tail(&urbp->urbp_list, &dum_hcd->urbp_list); 1278 urb->hcpriv = urbp; 1279 if (!dum_hcd->next_frame_urbp) 1280 dum_hcd->next_frame_urbp = urbp; 1281 if (usb_pipetype(urb->pipe) == PIPE_CONTROL) 1282 urb->error_count = 1; /* mark as a new urb */ 1283 1284 /* kick the scheduler, it'll do the rest */ 1285 if (!timer_pending(&dum_hcd->timer)) 1286 mod_timer(&dum_hcd->timer, jiffies + 1); 1287 1288 done: 1289 spin_unlock_irqrestore(&dum_hcd->dum->lock, flags); 1290 return rc; 1291 } 1292 1293 static int dummy_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status) 1294 { 1295 struct dummy_hcd *dum_hcd; 1296 unsigned long flags; 1297 int rc; 1298 1299 /* giveback happens automatically in timer callback, 1300 * so make sure the callback happens */ 1301 dum_hcd = hcd_to_dummy_hcd(hcd); 1302 spin_lock_irqsave(&dum_hcd->dum->lock, flags); 1303 1304 rc = usb_hcd_check_unlink_urb(hcd, urb, status); 1305 if (!rc && dum_hcd->rh_state != DUMMY_RH_RUNNING && 1306 !list_empty(&dum_hcd->urbp_list)) 1307 mod_timer(&dum_hcd->timer, jiffies); 1308 1309 spin_unlock_irqrestore(&dum_hcd->dum->lock, flags); 1310 return rc; 1311 } 1312 1313 static int dummy_perform_transfer(struct urb *urb, struct dummy_request *req, 1314 u32 len) 1315 { 1316 void *ubuf, *rbuf; 1317 struct urbp *urbp = urb->hcpriv; 1318 int to_host; 1319 struct sg_mapping_iter *miter = &urbp->miter; 1320 u32 trans = 0; 1321 u32 this_sg; 1322 bool next_sg; 1323 1324 to_host = usb_pipein(urb->pipe); 1325 rbuf = req->req.buf + req->req.actual; 1326 1327 if (!urb->num_sgs) { 1328 ubuf = urb->transfer_buffer + urb->actual_length; 1329 if (to_host) 1330 memcpy(ubuf, rbuf, len); 1331 else 1332 memcpy(rbuf, ubuf, len); 1333 return len; 1334 } 1335 1336 if (!urbp->miter_started) { 1337 u32 flags = SG_MITER_ATOMIC; 1338 1339 if (to_host) 1340 flags |= SG_MITER_TO_SG; 1341 else 1342 flags |= SG_MITER_FROM_SG; 1343 1344 sg_miter_start(miter, urb->sg, urb->num_sgs, flags); 1345 urbp->miter_started = 1; 1346 } 1347 next_sg = sg_miter_next(miter); 1348 if (next_sg == false) { 1349 WARN_ON_ONCE(1); 1350 return -EINVAL; 1351 } 1352 do { 1353 ubuf = miter->addr; 1354 this_sg = min_t(u32, len, miter->length); 1355 miter->consumed = this_sg; 1356 trans += this_sg; 1357 1358 if (to_host) 1359 memcpy(ubuf, rbuf, this_sg); 1360 else 1361 memcpy(rbuf, ubuf, this_sg); 1362 len -= this_sg; 1363 1364 if (!len) 1365 break; 1366 next_sg = sg_miter_next(miter); 1367 if (next_sg == false) { 1368 WARN_ON_ONCE(1); 1369 return -EINVAL; 1370 } 1371 1372 rbuf += this_sg; 1373 } while (1); 1374 1375 sg_miter_stop(miter); 1376 return trans; 1377 } 1378 1379 /* transfer up to a frame's worth; caller must own lock */ 1380 static int transfer(struct dummy_hcd *dum_hcd, struct urb *urb, 1381 struct dummy_ep *ep, int limit, int *status) 1382 { 1383 struct dummy *dum = dum_hcd->dum; 1384 struct dummy_request *req; 1385 int sent = 0; 1386 1387 top: 1388 /* if there's no request queued, the device is NAKing; return */ 1389 list_for_each_entry(req, &ep->queue, queue) { 1390 unsigned host_len, dev_len, len; 1391 int is_short, to_host; 1392 int rescan = 0; 1393 1394 if (dummy_ep_stream_en(dum_hcd, urb)) { 1395 if ((urb->stream_id != req->req.stream_id)) 1396 continue; 1397 } 1398 1399 /* 1..N packets of ep->ep.maxpacket each ... the last one 1400 * may be short (including zero length). 1401 * 1402 * writer can send a zlp explicitly (length 0) or implicitly 1403 * (length mod maxpacket zero, and 'zero' flag); they always 1404 * terminate reads. 1405 */ 1406 host_len = urb->transfer_buffer_length - urb->actual_length; 1407 dev_len = req->req.length - req->req.actual; 1408 len = min(host_len, dev_len); 1409 1410 /* FIXME update emulated data toggle too */ 1411 1412 to_host = usb_pipein(urb->pipe); 1413 if (unlikely(len == 0)) 1414 is_short = 1; 1415 else { 1416 /* not enough bandwidth left? */ 1417 if (limit < ep->ep.maxpacket && limit < len) 1418 break; 1419 len = min_t(unsigned, len, limit); 1420 if (len == 0) 1421 break; 1422 1423 /* send multiple of maxpacket first, then remainder */ 1424 if (len >= ep->ep.maxpacket) { 1425 is_short = 0; 1426 if (len % ep->ep.maxpacket) 1427 rescan = 1; 1428 len -= len % ep->ep.maxpacket; 1429 } else { 1430 is_short = 1; 1431 } 1432 1433 len = dummy_perform_transfer(urb, req, len); 1434 1435 ep->last_io = jiffies; 1436 if ((int)len < 0) { 1437 req->req.status = len; 1438 } else { 1439 limit -= len; 1440 sent += len; 1441 urb->actual_length += len; 1442 req->req.actual += len; 1443 } 1444 } 1445 1446 /* short packets terminate, maybe with overflow/underflow. 1447 * it's only really an error to write too much. 1448 * 1449 * partially filling a buffer optionally blocks queue advances 1450 * (so completion handlers can clean up the queue) but we don't 1451 * need to emulate such data-in-flight. 1452 */ 1453 if (is_short) { 1454 if (host_len == dev_len) { 1455 req->req.status = 0; 1456 *status = 0; 1457 } else if (to_host) { 1458 req->req.status = 0; 1459 if (dev_len > host_len) 1460 *status = -EOVERFLOW; 1461 else 1462 *status = 0; 1463 } else { 1464 *status = 0; 1465 if (host_len > dev_len) 1466 req->req.status = -EOVERFLOW; 1467 else 1468 req->req.status = 0; 1469 } 1470 1471 /* 1472 * many requests terminate without a short packet. 1473 * send a zlp if demanded by flags. 1474 */ 1475 } else { 1476 if (req->req.length == req->req.actual) { 1477 if (req->req.zero && to_host) 1478 rescan = 1; 1479 else 1480 req->req.status = 0; 1481 } 1482 if (urb->transfer_buffer_length == urb->actual_length) { 1483 if (urb->transfer_flags & URB_ZERO_PACKET && 1484 !to_host) 1485 rescan = 1; 1486 else 1487 *status = 0; 1488 } 1489 } 1490 1491 /* device side completion --> continuable */ 1492 if (req->req.status != -EINPROGRESS) { 1493 list_del_init(&req->queue); 1494 1495 spin_unlock(&dum->lock); 1496 usb_gadget_giveback_request(&ep->ep, &req->req); 1497 spin_lock(&dum->lock); 1498 1499 /* requests might have been unlinked... */ 1500 rescan = 1; 1501 } 1502 1503 /* host side completion --> terminate */ 1504 if (*status != -EINPROGRESS) 1505 break; 1506 1507 /* rescan to continue with any other queued i/o */ 1508 if (rescan) 1509 goto top; 1510 } 1511 return sent; 1512 } 1513 1514 static int periodic_bytes(struct dummy *dum, struct dummy_ep *ep) 1515 { 1516 int limit = ep->ep.maxpacket; 1517 1518 if (dum->gadget.speed == USB_SPEED_HIGH) { 1519 int tmp; 1520 1521 /* high bandwidth mode */ 1522 tmp = usb_endpoint_maxp_mult(ep->desc); 1523 tmp *= 8 /* applies to entire frame */; 1524 limit += limit * tmp; 1525 } 1526 if (dum->gadget.speed == USB_SPEED_SUPER) { 1527 switch (usb_endpoint_type(ep->desc)) { 1528 case USB_ENDPOINT_XFER_ISOC: 1529 /* Sec. 4.4.8.2 USB3.0 Spec */ 1530 limit = 3 * 16 * 1024 * 8; 1531 break; 1532 case USB_ENDPOINT_XFER_INT: 1533 /* Sec. 4.4.7.2 USB3.0 Spec */ 1534 limit = 3 * 1024 * 8; 1535 break; 1536 case USB_ENDPOINT_XFER_BULK: 1537 default: 1538 break; 1539 } 1540 } 1541 return limit; 1542 } 1543 1544 #define is_active(dum_hcd) ((dum_hcd->port_status & \ 1545 (USB_PORT_STAT_CONNECTION | USB_PORT_STAT_ENABLE | \ 1546 USB_PORT_STAT_SUSPEND)) \ 1547 == (USB_PORT_STAT_CONNECTION | USB_PORT_STAT_ENABLE)) 1548 1549 static struct dummy_ep *find_endpoint(struct dummy *dum, u8 address) 1550 { 1551 int i; 1552 1553 if (!is_active((dum->gadget.speed == USB_SPEED_SUPER ? 1554 dum->ss_hcd : dum->hs_hcd))) 1555 return NULL; 1556 if (!dum->ints_enabled) 1557 return NULL; 1558 if ((address & ~USB_DIR_IN) == 0) 1559 return &dum->ep[0]; 1560 for (i = 1; i < DUMMY_ENDPOINTS; i++) { 1561 struct dummy_ep *ep = &dum->ep[i]; 1562 1563 if (!ep->desc) 1564 continue; 1565 if (ep->desc->bEndpointAddress == address) 1566 return ep; 1567 } 1568 return NULL; 1569 } 1570 1571 #undef is_active 1572 1573 #define Dev_Request (USB_TYPE_STANDARD | USB_RECIP_DEVICE) 1574 #define Dev_InRequest (Dev_Request | USB_DIR_IN) 1575 #define Intf_Request (USB_TYPE_STANDARD | USB_RECIP_INTERFACE) 1576 #define Intf_InRequest (Intf_Request | USB_DIR_IN) 1577 #define Ep_Request (USB_TYPE_STANDARD | USB_RECIP_ENDPOINT) 1578 #define Ep_InRequest (Ep_Request | USB_DIR_IN) 1579 1580 1581 /** 1582 * handle_control_request() - handles all control transfers 1583 * @dum: pointer to dummy (the_controller) 1584 * @urb: the urb request to handle 1585 * @setup: pointer to the setup data for a USB device control 1586 * request 1587 * @status: pointer to request handling status 1588 * 1589 * Return 0 - if the request was handled 1590 * 1 - if the request wasn't handles 1591 * error code on error 1592 */ 1593 static int handle_control_request(struct dummy_hcd *dum_hcd, struct urb *urb, 1594 struct usb_ctrlrequest *setup, 1595 int *status) 1596 { 1597 struct dummy_ep *ep2; 1598 struct dummy *dum = dum_hcd->dum; 1599 int ret_val = 1; 1600 unsigned w_index; 1601 unsigned w_value; 1602 1603 w_index = le16_to_cpu(setup->wIndex); 1604 w_value = le16_to_cpu(setup->wValue); 1605 switch (setup->bRequest) { 1606 case USB_REQ_SET_ADDRESS: 1607 if (setup->bRequestType != Dev_Request) 1608 break; 1609 dum->address = w_value; 1610 *status = 0; 1611 dev_dbg(udc_dev(dum), "set_address = %d\n", 1612 w_value); 1613 ret_val = 0; 1614 break; 1615 case USB_REQ_SET_FEATURE: 1616 if (setup->bRequestType == Dev_Request) { 1617 ret_val = 0; 1618 switch (w_value) { 1619 case USB_DEVICE_REMOTE_WAKEUP: 1620 break; 1621 case USB_DEVICE_B_HNP_ENABLE: 1622 dum->gadget.b_hnp_enable = 1; 1623 break; 1624 case USB_DEVICE_A_HNP_SUPPORT: 1625 dum->gadget.a_hnp_support = 1; 1626 break; 1627 case USB_DEVICE_A_ALT_HNP_SUPPORT: 1628 dum->gadget.a_alt_hnp_support = 1; 1629 break; 1630 case USB_DEVICE_U1_ENABLE: 1631 if (dummy_hcd_to_hcd(dum_hcd)->speed == 1632 HCD_USB3) 1633 w_value = USB_DEV_STAT_U1_ENABLED; 1634 else 1635 ret_val = -EOPNOTSUPP; 1636 break; 1637 case USB_DEVICE_U2_ENABLE: 1638 if (dummy_hcd_to_hcd(dum_hcd)->speed == 1639 HCD_USB3) 1640 w_value = USB_DEV_STAT_U2_ENABLED; 1641 else 1642 ret_val = -EOPNOTSUPP; 1643 break; 1644 case USB_DEVICE_LTM_ENABLE: 1645 if (dummy_hcd_to_hcd(dum_hcd)->speed == 1646 HCD_USB3) 1647 w_value = USB_DEV_STAT_LTM_ENABLED; 1648 else 1649 ret_val = -EOPNOTSUPP; 1650 break; 1651 default: 1652 ret_val = -EOPNOTSUPP; 1653 } 1654 if (ret_val == 0) { 1655 dum->devstatus |= (1 << w_value); 1656 *status = 0; 1657 } 1658 } else if (setup->bRequestType == Ep_Request) { 1659 /* endpoint halt */ 1660 ep2 = find_endpoint(dum, w_index); 1661 if (!ep2 || ep2->ep.name == ep0name) { 1662 ret_val = -EOPNOTSUPP; 1663 break; 1664 } 1665 ep2->halted = 1; 1666 ret_val = 0; 1667 *status = 0; 1668 } 1669 break; 1670 case USB_REQ_CLEAR_FEATURE: 1671 if (setup->bRequestType == Dev_Request) { 1672 ret_val = 0; 1673 switch (w_value) { 1674 case USB_DEVICE_REMOTE_WAKEUP: 1675 w_value = USB_DEVICE_REMOTE_WAKEUP; 1676 break; 1677 case USB_DEVICE_U1_ENABLE: 1678 if (dummy_hcd_to_hcd(dum_hcd)->speed == 1679 HCD_USB3) 1680 w_value = USB_DEV_STAT_U1_ENABLED; 1681 else 1682 ret_val = -EOPNOTSUPP; 1683 break; 1684 case USB_DEVICE_U2_ENABLE: 1685 if (dummy_hcd_to_hcd(dum_hcd)->speed == 1686 HCD_USB3) 1687 w_value = USB_DEV_STAT_U2_ENABLED; 1688 else 1689 ret_val = -EOPNOTSUPP; 1690 break; 1691 case USB_DEVICE_LTM_ENABLE: 1692 if (dummy_hcd_to_hcd(dum_hcd)->speed == 1693 HCD_USB3) 1694 w_value = USB_DEV_STAT_LTM_ENABLED; 1695 else 1696 ret_val = -EOPNOTSUPP; 1697 break; 1698 default: 1699 ret_val = -EOPNOTSUPP; 1700 break; 1701 } 1702 if (ret_val == 0) { 1703 dum->devstatus &= ~(1 << w_value); 1704 *status = 0; 1705 } 1706 } else if (setup->bRequestType == Ep_Request) { 1707 /* endpoint halt */ 1708 ep2 = find_endpoint(dum, w_index); 1709 if (!ep2) { 1710 ret_val = -EOPNOTSUPP; 1711 break; 1712 } 1713 if (!ep2->wedged) 1714 ep2->halted = 0; 1715 ret_val = 0; 1716 *status = 0; 1717 } 1718 break; 1719 case USB_REQ_GET_STATUS: 1720 if (setup->bRequestType == Dev_InRequest 1721 || setup->bRequestType == Intf_InRequest 1722 || setup->bRequestType == Ep_InRequest) { 1723 char *buf; 1724 /* 1725 * device: remote wakeup, selfpowered 1726 * interface: nothing 1727 * endpoint: halt 1728 */ 1729 buf = (char *)urb->transfer_buffer; 1730 if (urb->transfer_buffer_length > 0) { 1731 if (setup->bRequestType == Ep_InRequest) { 1732 ep2 = find_endpoint(dum, w_index); 1733 if (!ep2) { 1734 ret_val = -EOPNOTSUPP; 1735 break; 1736 } 1737 buf[0] = ep2->halted; 1738 } else if (setup->bRequestType == 1739 Dev_InRequest) { 1740 buf[0] = (u8)dum->devstatus; 1741 } else 1742 buf[0] = 0; 1743 } 1744 if (urb->transfer_buffer_length > 1) 1745 buf[1] = 0; 1746 urb->actual_length = min_t(u32, 2, 1747 urb->transfer_buffer_length); 1748 ret_val = 0; 1749 *status = 0; 1750 } 1751 break; 1752 } 1753 return ret_val; 1754 } 1755 1756 /* drive both sides of the transfers; looks like irq handlers to 1757 * both drivers except the callbacks aren't in_irq(). 1758 */ 1759 static void dummy_timer(struct timer_list *t) 1760 { 1761 struct dummy_hcd *dum_hcd = from_timer(dum_hcd, t, timer); 1762 struct dummy *dum = dum_hcd->dum; 1763 struct urbp *urbp, *tmp; 1764 unsigned long flags; 1765 int limit, total; 1766 int i; 1767 1768 /* simplistic model for one frame's bandwidth */ 1769 /* FIXME: account for transaction and packet overhead */ 1770 switch (dum->gadget.speed) { 1771 case USB_SPEED_LOW: 1772 total = 8/*bytes*/ * 12/*packets*/; 1773 break; 1774 case USB_SPEED_FULL: 1775 total = 64/*bytes*/ * 19/*packets*/; 1776 break; 1777 case USB_SPEED_HIGH: 1778 total = 512/*bytes*/ * 13/*packets*/ * 8/*uframes*/; 1779 break; 1780 case USB_SPEED_SUPER: 1781 /* Bus speed is 500000 bytes/ms, so use a little less */ 1782 total = 490000; 1783 break; 1784 default: /* Can't happen */ 1785 dev_err(dummy_dev(dum_hcd), "bogus device speed\n"); 1786 total = 0; 1787 break; 1788 } 1789 1790 /* FIXME if HZ != 1000 this will probably misbehave ... */ 1791 1792 /* look at each urb queued by the host side driver */ 1793 spin_lock_irqsave(&dum->lock, flags); 1794 1795 if (!dum_hcd->udev) { 1796 dev_err(dummy_dev(dum_hcd), 1797 "timer fired with no URBs pending?\n"); 1798 spin_unlock_irqrestore(&dum->lock, flags); 1799 return; 1800 } 1801 dum_hcd->next_frame_urbp = NULL; 1802 1803 for (i = 0; i < DUMMY_ENDPOINTS; i++) { 1804 if (!ep_info[i].name) 1805 break; 1806 dum->ep[i].already_seen = 0; 1807 } 1808 1809 restart: 1810 list_for_each_entry_safe(urbp, tmp, &dum_hcd->urbp_list, urbp_list) { 1811 struct urb *urb; 1812 struct dummy_request *req; 1813 u8 address; 1814 struct dummy_ep *ep = NULL; 1815 int status = -EINPROGRESS; 1816 1817 /* stop when we reach URBs queued after the timer interrupt */ 1818 if (urbp == dum_hcd->next_frame_urbp) 1819 break; 1820 1821 urb = urbp->urb; 1822 if (urb->unlinked) 1823 goto return_urb; 1824 else if (dum_hcd->rh_state != DUMMY_RH_RUNNING) 1825 continue; 1826 1827 /* Used up this frame's bandwidth? */ 1828 if (total <= 0) 1829 continue; 1830 1831 /* find the gadget's ep for this request (if configured) */ 1832 address = usb_pipeendpoint (urb->pipe); 1833 if (usb_pipein(urb->pipe)) 1834 address |= USB_DIR_IN; 1835 ep = find_endpoint(dum, address); 1836 if (!ep) { 1837 /* set_configuration() disagreement */ 1838 dev_dbg(dummy_dev(dum_hcd), 1839 "no ep configured for urb %p\n", 1840 urb); 1841 status = -EPROTO; 1842 goto return_urb; 1843 } 1844 1845 if (ep->already_seen) 1846 continue; 1847 ep->already_seen = 1; 1848 if (ep == &dum->ep[0] && urb->error_count) { 1849 ep->setup_stage = 1; /* a new urb */ 1850 urb->error_count = 0; 1851 } 1852 if (ep->halted && !ep->setup_stage) { 1853 /* NOTE: must not be iso! */ 1854 dev_dbg(dummy_dev(dum_hcd), "ep %s halted, urb %p\n", 1855 ep->ep.name, urb); 1856 status = -EPIPE; 1857 goto return_urb; 1858 } 1859 /* FIXME make sure both ends agree on maxpacket */ 1860 1861 /* handle control requests */ 1862 if (ep == &dum->ep[0] && ep->setup_stage) { 1863 struct usb_ctrlrequest setup; 1864 int value = 1; 1865 1866 setup = *(struct usb_ctrlrequest *) urb->setup_packet; 1867 /* paranoia, in case of stale queued data */ 1868 list_for_each_entry(req, &ep->queue, queue) { 1869 list_del_init(&req->queue); 1870 req->req.status = -EOVERFLOW; 1871 dev_dbg(udc_dev(dum), "stale req = %p\n", 1872 req); 1873 1874 spin_unlock(&dum->lock); 1875 usb_gadget_giveback_request(&ep->ep, &req->req); 1876 spin_lock(&dum->lock); 1877 ep->already_seen = 0; 1878 goto restart; 1879 } 1880 1881 /* gadget driver never sees set_address or operations 1882 * on standard feature flags. some hardware doesn't 1883 * even expose them. 1884 */ 1885 ep->last_io = jiffies; 1886 ep->setup_stage = 0; 1887 ep->halted = 0; 1888 1889 value = handle_control_request(dum_hcd, urb, &setup, 1890 &status); 1891 1892 /* gadget driver handles all other requests. block 1893 * until setup() returns; no reentrancy issues etc. 1894 */ 1895 if (value > 0) { 1896 ++dum->callback_usage; 1897 spin_unlock(&dum->lock); 1898 value = dum->driver->setup(&dum->gadget, 1899 &setup); 1900 spin_lock(&dum->lock); 1901 --dum->callback_usage; 1902 1903 if (value >= 0) { 1904 /* no delays (max 64KB data stage) */ 1905 limit = 64*1024; 1906 goto treat_control_like_bulk; 1907 } 1908 /* error, see below */ 1909 } 1910 1911 if (value < 0) { 1912 if (value != -EOPNOTSUPP) 1913 dev_dbg(udc_dev(dum), 1914 "setup --> %d\n", 1915 value); 1916 status = -EPIPE; 1917 urb->actual_length = 0; 1918 } 1919 1920 goto return_urb; 1921 } 1922 1923 /* non-control requests */ 1924 limit = total; 1925 switch (usb_pipetype(urb->pipe)) { 1926 case PIPE_ISOCHRONOUS: 1927 /* 1928 * We don't support isochronous. But if we did, 1929 * here are some of the issues we'd have to face: 1930 * 1931 * Is it urb->interval since the last xfer? 1932 * Use urb->iso_frame_desc[i]. 1933 * Complete whether or not ep has requests queued. 1934 * Report random errors, to debug drivers. 1935 */ 1936 limit = max(limit, periodic_bytes(dum, ep)); 1937 status = -EINVAL; /* fail all xfers */ 1938 break; 1939 1940 case PIPE_INTERRUPT: 1941 /* FIXME is it urb->interval since the last xfer? 1942 * this almost certainly polls too fast. 1943 */ 1944 limit = max(limit, periodic_bytes(dum, ep)); 1945 /* FALLTHROUGH */ 1946 1947 default: 1948 treat_control_like_bulk: 1949 ep->last_io = jiffies; 1950 total -= transfer(dum_hcd, urb, ep, limit, &status); 1951 break; 1952 } 1953 1954 /* incomplete transfer? */ 1955 if (status == -EINPROGRESS) 1956 continue; 1957 1958 return_urb: 1959 list_del(&urbp->urbp_list); 1960 kfree(urbp); 1961 if (ep) 1962 ep->already_seen = ep->setup_stage = 0; 1963 1964 usb_hcd_unlink_urb_from_ep(dummy_hcd_to_hcd(dum_hcd), urb); 1965 spin_unlock(&dum->lock); 1966 usb_hcd_giveback_urb(dummy_hcd_to_hcd(dum_hcd), urb, status); 1967 spin_lock(&dum->lock); 1968 1969 goto restart; 1970 } 1971 1972 if (list_empty(&dum_hcd->urbp_list)) { 1973 usb_put_dev(dum_hcd->udev); 1974 dum_hcd->udev = NULL; 1975 } else if (dum_hcd->rh_state == DUMMY_RH_RUNNING) { 1976 /* want a 1 msec delay here */ 1977 mod_timer(&dum_hcd->timer, jiffies + msecs_to_jiffies(1)); 1978 } 1979 1980 spin_unlock_irqrestore(&dum->lock, flags); 1981 } 1982 1983 /*-------------------------------------------------------------------------*/ 1984 1985 #define PORT_C_MASK \ 1986 ((USB_PORT_STAT_C_CONNECTION \ 1987 | USB_PORT_STAT_C_ENABLE \ 1988 | USB_PORT_STAT_C_SUSPEND \ 1989 | USB_PORT_STAT_C_OVERCURRENT \ 1990 | USB_PORT_STAT_C_RESET) << 16) 1991 1992 static int dummy_hub_status(struct usb_hcd *hcd, char *buf) 1993 { 1994 struct dummy_hcd *dum_hcd; 1995 unsigned long flags; 1996 int retval = 0; 1997 1998 dum_hcd = hcd_to_dummy_hcd(hcd); 1999 2000 spin_lock_irqsave(&dum_hcd->dum->lock, flags); 2001 if (!HCD_HW_ACCESSIBLE(hcd)) 2002 goto done; 2003 2004 if (dum_hcd->resuming && time_after_eq(jiffies, dum_hcd->re_timeout)) { 2005 dum_hcd->port_status |= (USB_PORT_STAT_C_SUSPEND << 16); 2006 dum_hcd->port_status &= ~USB_PORT_STAT_SUSPEND; 2007 set_link_state(dum_hcd); 2008 } 2009 2010 if ((dum_hcd->port_status & PORT_C_MASK) != 0) { 2011 *buf = (1 << 1); 2012 dev_dbg(dummy_dev(dum_hcd), "port status 0x%08x has changes\n", 2013 dum_hcd->port_status); 2014 retval = 1; 2015 if (dum_hcd->rh_state == DUMMY_RH_SUSPENDED) 2016 usb_hcd_resume_root_hub(hcd); 2017 } 2018 done: 2019 spin_unlock_irqrestore(&dum_hcd->dum->lock, flags); 2020 return retval; 2021 } 2022 2023 /* usb 3.0 root hub device descriptor */ 2024 static struct { 2025 struct usb_bos_descriptor bos; 2026 struct usb_ss_cap_descriptor ss_cap; 2027 } __packed usb3_bos_desc = { 2028 2029 .bos = { 2030 .bLength = USB_DT_BOS_SIZE, 2031 .bDescriptorType = USB_DT_BOS, 2032 .wTotalLength = cpu_to_le16(sizeof(usb3_bos_desc)), 2033 .bNumDeviceCaps = 1, 2034 }, 2035 .ss_cap = { 2036 .bLength = USB_DT_USB_SS_CAP_SIZE, 2037 .bDescriptorType = USB_DT_DEVICE_CAPABILITY, 2038 .bDevCapabilityType = USB_SS_CAP_TYPE, 2039 .wSpeedSupported = cpu_to_le16(USB_5GBPS_OPERATION), 2040 .bFunctionalitySupport = ilog2(USB_5GBPS_OPERATION), 2041 }, 2042 }; 2043 2044 static inline void 2045 ss_hub_descriptor(struct usb_hub_descriptor *desc) 2046 { 2047 memset(desc, 0, sizeof *desc); 2048 desc->bDescriptorType = USB_DT_SS_HUB; 2049 desc->bDescLength = 12; 2050 desc->wHubCharacteristics = cpu_to_le16( 2051 HUB_CHAR_INDV_PORT_LPSM | 2052 HUB_CHAR_COMMON_OCPM); 2053 desc->bNbrPorts = 1; 2054 desc->u.ss.bHubHdrDecLat = 0x04; /* Worst case: 0.4 micro sec*/ 2055 desc->u.ss.DeviceRemovable = 0; 2056 } 2057 2058 static inline void hub_descriptor(struct usb_hub_descriptor *desc) 2059 { 2060 memset(desc, 0, sizeof *desc); 2061 desc->bDescriptorType = USB_DT_HUB; 2062 desc->bDescLength = 9; 2063 desc->wHubCharacteristics = cpu_to_le16( 2064 HUB_CHAR_INDV_PORT_LPSM | 2065 HUB_CHAR_COMMON_OCPM); 2066 desc->bNbrPorts = 1; 2067 desc->u.hs.DeviceRemovable[0] = 0; 2068 desc->u.hs.DeviceRemovable[1] = 0xff; /* PortPwrCtrlMask */ 2069 } 2070 2071 static int dummy_hub_control( 2072 struct usb_hcd *hcd, 2073 u16 typeReq, 2074 u16 wValue, 2075 u16 wIndex, 2076 char *buf, 2077 u16 wLength 2078 ) { 2079 struct dummy_hcd *dum_hcd; 2080 int retval = 0; 2081 unsigned long flags; 2082 2083 if (!HCD_HW_ACCESSIBLE(hcd)) 2084 return -ETIMEDOUT; 2085 2086 dum_hcd = hcd_to_dummy_hcd(hcd); 2087 2088 spin_lock_irqsave(&dum_hcd->dum->lock, flags); 2089 switch (typeReq) { 2090 case ClearHubFeature: 2091 break; 2092 case ClearPortFeature: 2093 switch (wValue) { 2094 case USB_PORT_FEAT_SUSPEND: 2095 if (hcd->speed == HCD_USB3) { 2096 dev_dbg(dummy_dev(dum_hcd), 2097 "USB_PORT_FEAT_SUSPEND req not " 2098 "supported for USB 3.0 roothub\n"); 2099 goto error; 2100 } 2101 if (dum_hcd->port_status & USB_PORT_STAT_SUSPEND) { 2102 /* 20msec resume signaling */ 2103 dum_hcd->resuming = 1; 2104 dum_hcd->re_timeout = jiffies + 2105 msecs_to_jiffies(20); 2106 } 2107 break; 2108 case USB_PORT_FEAT_POWER: 2109 dev_dbg(dummy_dev(dum_hcd), "power-off\n"); 2110 if (hcd->speed == HCD_USB3) 2111 dum_hcd->port_status &= ~USB_SS_PORT_STAT_POWER; 2112 else 2113 dum_hcd->port_status &= ~USB_PORT_STAT_POWER; 2114 set_link_state(dum_hcd); 2115 break; 2116 default: 2117 dum_hcd->port_status &= ~(1 << wValue); 2118 set_link_state(dum_hcd); 2119 } 2120 break; 2121 case GetHubDescriptor: 2122 if (hcd->speed == HCD_USB3 && 2123 (wLength < USB_DT_SS_HUB_SIZE || 2124 wValue != (USB_DT_SS_HUB << 8))) { 2125 dev_dbg(dummy_dev(dum_hcd), 2126 "Wrong hub descriptor type for " 2127 "USB 3.0 roothub.\n"); 2128 goto error; 2129 } 2130 if (hcd->speed == HCD_USB3) 2131 ss_hub_descriptor((struct usb_hub_descriptor *) buf); 2132 else 2133 hub_descriptor((struct usb_hub_descriptor *) buf); 2134 break; 2135 2136 case DeviceRequest | USB_REQ_GET_DESCRIPTOR: 2137 if (hcd->speed != HCD_USB3) 2138 goto error; 2139 2140 if ((wValue >> 8) != USB_DT_BOS) 2141 goto error; 2142 2143 memcpy(buf, &usb3_bos_desc, sizeof(usb3_bos_desc)); 2144 retval = sizeof(usb3_bos_desc); 2145 break; 2146 2147 case GetHubStatus: 2148 *(__le32 *) buf = cpu_to_le32(0); 2149 break; 2150 case GetPortStatus: 2151 if (wIndex != 1) 2152 retval = -EPIPE; 2153 2154 /* whoever resets or resumes must GetPortStatus to 2155 * complete it!! 2156 */ 2157 if (dum_hcd->resuming && 2158 time_after_eq(jiffies, dum_hcd->re_timeout)) { 2159 dum_hcd->port_status |= (USB_PORT_STAT_C_SUSPEND << 16); 2160 dum_hcd->port_status &= ~USB_PORT_STAT_SUSPEND; 2161 } 2162 if ((dum_hcd->port_status & USB_PORT_STAT_RESET) != 0 && 2163 time_after_eq(jiffies, dum_hcd->re_timeout)) { 2164 dum_hcd->port_status |= (USB_PORT_STAT_C_RESET << 16); 2165 dum_hcd->port_status &= ~USB_PORT_STAT_RESET; 2166 if (dum_hcd->dum->pullup) { 2167 dum_hcd->port_status |= USB_PORT_STAT_ENABLE; 2168 2169 if (hcd->speed < HCD_USB3) { 2170 switch (dum_hcd->dum->gadget.speed) { 2171 case USB_SPEED_HIGH: 2172 dum_hcd->port_status |= 2173 USB_PORT_STAT_HIGH_SPEED; 2174 break; 2175 case USB_SPEED_LOW: 2176 dum_hcd->dum->gadget.ep0-> 2177 maxpacket = 8; 2178 dum_hcd->port_status |= 2179 USB_PORT_STAT_LOW_SPEED; 2180 break; 2181 default: 2182 break; 2183 } 2184 } 2185 } 2186 } 2187 set_link_state(dum_hcd); 2188 ((__le16 *) buf)[0] = cpu_to_le16(dum_hcd->port_status); 2189 ((__le16 *) buf)[1] = cpu_to_le16(dum_hcd->port_status >> 16); 2190 break; 2191 case SetHubFeature: 2192 retval = -EPIPE; 2193 break; 2194 case SetPortFeature: 2195 switch (wValue) { 2196 case USB_PORT_FEAT_LINK_STATE: 2197 if (hcd->speed != HCD_USB3) { 2198 dev_dbg(dummy_dev(dum_hcd), 2199 "USB_PORT_FEAT_LINK_STATE req not " 2200 "supported for USB 2.0 roothub\n"); 2201 goto error; 2202 } 2203 /* 2204 * Since this is dummy we don't have an actual link so 2205 * there is nothing to do for the SET_LINK_STATE cmd 2206 */ 2207 break; 2208 case USB_PORT_FEAT_U1_TIMEOUT: 2209 case USB_PORT_FEAT_U2_TIMEOUT: 2210 /* TODO: add suspend/resume support! */ 2211 if (hcd->speed != HCD_USB3) { 2212 dev_dbg(dummy_dev(dum_hcd), 2213 "USB_PORT_FEAT_U1/2_TIMEOUT req not " 2214 "supported for USB 2.0 roothub\n"); 2215 goto error; 2216 } 2217 break; 2218 case USB_PORT_FEAT_SUSPEND: 2219 /* Applicable only for USB2.0 hub */ 2220 if (hcd->speed == HCD_USB3) { 2221 dev_dbg(dummy_dev(dum_hcd), 2222 "USB_PORT_FEAT_SUSPEND req not " 2223 "supported for USB 3.0 roothub\n"); 2224 goto error; 2225 } 2226 if (dum_hcd->active) { 2227 dum_hcd->port_status |= USB_PORT_STAT_SUSPEND; 2228 2229 /* HNP would happen here; for now we 2230 * assume b_bus_req is always true. 2231 */ 2232 set_link_state(dum_hcd); 2233 if (((1 << USB_DEVICE_B_HNP_ENABLE) 2234 & dum_hcd->dum->devstatus) != 0) 2235 dev_dbg(dummy_dev(dum_hcd), 2236 "no HNP yet!\n"); 2237 } 2238 break; 2239 case USB_PORT_FEAT_POWER: 2240 if (hcd->speed == HCD_USB3) 2241 dum_hcd->port_status |= USB_SS_PORT_STAT_POWER; 2242 else 2243 dum_hcd->port_status |= USB_PORT_STAT_POWER; 2244 set_link_state(dum_hcd); 2245 break; 2246 case USB_PORT_FEAT_BH_PORT_RESET: 2247 /* Applicable only for USB3.0 hub */ 2248 if (hcd->speed != HCD_USB3) { 2249 dev_dbg(dummy_dev(dum_hcd), 2250 "USB_PORT_FEAT_BH_PORT_RESET req not " 2251 "supported for USB 2.0 roothub\n"); 2252 goto error; 2253 } 2254 /* FALLS THROUGH */ 2255 case USB_PORT_FEAT_RESET: 2256 /* if it's already enabled, disable */ 2257 if (hcd->speed == HCD_USB3) { 2258 dum_hcd->port_status = 0; 2259 dum_hcd->port_status = 2260 (USB_SS_PORT_STAT_POWER | 2261 USB_PORT_STAT_CONNECTION | 2262 USB_PORT_STAT_RESET); 2263 } else 2264 dum_hcd->port_status &= ~(USB_PORT_STAT_ENABLE 2265 | USB_PORT_STAT_LOW_SPEED 2266 | USB_PORT_STAT_HIGH_SPEED); 2267 /* 2268 * We want to reset device status. All but the 2269 * Self powered feature 2270 */ 2271 dum_hcd->dum->devstatus &= 2272 (1 << USB_DEVICE_SELF_POWERED); 2273 /* 2274 * FIXME USB3.0: what is the correct reset signaling 2275 * interval? Is it still 50msec as for HS? 2276 */ 2277 dum_hcd->re_timeout = jiffies + msecs_to_jiffies(50); 2278 /* FALLS THROUGH */ 2279 default: 2280 if (hcd->speed == HCD_USB3) { 2281 if ((dum_hcd->port_status & 2282 USB_SS_PORT_STAT_POWER) != 0) { 2283 dum_hcd->port_status |= (1 << wValue); 2284 } 2285 } else 2286 if ((dum_hcd->port_status & 2287 USB_PORT_STAT_POWER) != 0) { 2288 dum_hcd->port_status |= (1 << wValue); 2289 } 2290 set_link_state(dum_hcd); 2291 } 2292 break; 2293 case GetPortErrorCount: 2294 if (hcd->speed != HCD_USB3) { 2295 dev_dbg(dummy_dev(dum_hcd), 2296 "GetPortErrorCount req not " 2297 "supported for USB 2.0 roothub\n"); 2298 goto error; 2299 } 2300 /* We'll always return 0 since this is a dummy hub */ 2301 *(__le32 *) buf = cpu_to_le32(0); 2302 break; 2303 case SetHubDepth: 2304 if (hcd->speed != HCD_USB3) { 2305 dev_dbg(dummy_dev(dum_hcd), 2306 "SetHubDepth req not supported for " 2307 "USB 2.0 roothub\n"); 2308 goto error; 2309 } 2310 break; 2311 default: 2312 dev_dbg(dummy_dev(dum_hcd), 2313 "hub control req%04x v%04x i%04x l%d\n", 2314 typeReq, wValue, wIndex, wLength); 2315 error: 2316 /* "protocol stall" on error */ 2317 retval = -EPIPE; 2318 } 2319 spin_unlock_irqrestore(&dum_hcd->dum->lock, flags); 2320 2321 if ((dum_hcd->port_status & PORT_C_MASK) != 0) 2322 usb_hcd_poll_rh_status(hcd); 2323 return retval; 2324 } 2325 2326 static int dummy_bus_suspend(struct usb_hcd *hcd) 2327 { 2328 struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd); 2329 2330 dev_dbg(&hcd->self.root_hub->dev, "%s\n", __func__); 2331 2332 spin_lock_irq(&dum_hcd->dum->lock); 2333 dum_hcd->rh_state = DUMMY_RH_SUSPENDED; 2334 set_link_state(dum_hcd); 2335 hcd->state = HC_STATE_SUSPENDED; 2336 spin_unlock_irq(&dum_hcd->dum->lock); 2337 return 0; 2338 } 2339 2340 static int dummy_bus_resume(struct usb_hcd *hcd) 2341 { 2342 struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd); 2343 int rc = 0; 2344 2345 dev_dbg(&hcd->self.root_hub->dev, "%s\n", __func__); 2346 2347 spin_lock_irq(&dum_hcd->dum->lock); 2348 if (!HCD_HW_ACCESSIBLE(hcd)) { 2349 rc = -ESHUTDOWN; 2350 } else { 2351 dum_hcd->rh_state = DUMMY_RH_RUNNING; 2352 set_link_state(dum_hcd); 2353 if (!list_empty(&dum_hcd->urbp_list)) 2354 mod_timer(&dum_hcd->timer, jiffies); 2355 hcd->state = HC_STATE_RUNNING; 2356 } 2357 spin_unlock_irq(&dum_hcd->dum->lock); 2358 return rc; 2359 } 2360 2361 /*-------------------------------------------------------------------------*/ 2362 2363 static inline ssize_t show_urb(char *buf, size_t size, struct urb *urb) 2364 { 2365 int ep = usb_pipeendpoint(urb->pipe); 2366 2367 return scnprintf(buf, size, 2368 "urb/%p %s ep%d%s%s len %d/%d\n", 2369 urb, 2370 ({ char *s; 2371 switch (urb->dev->speed) { 2372 case USB_SPEED_LOW: 2373 s = "ls"; 2374 break; 2375 case USB_SPEED_FULL: 2376 s = "fs"; 2377 break; 2378 case USB_SPEED_HIGH: 2379 s = "hs"; 2380 break; 2381 case USB_SPEED_SUPER: 2382 s = "ss"; 2383 break; 2384 default: 2385 s = "?"; 2386 break; 2387 } s; }), 2388 ep, ep ? (usb_pipein(urb->pipe) ? "in" : "out") : "", 2389 ({ char *s; \ 2390 switch (usb_pipetype(urb->pipe)) { \ 2391 case PIPE_CONTROL: \ 2392 s = ""; \ 2393 break; \ 2394 case PIPE_BULK: \ 2395 s = "-bulk"; \ 2396 break; \ 2397 case PIPE_INTERRUPT: \ 2398 s = "-int"; \ 2399 break; \ 2400 default: \ 2401 s = "-iso"; \ 2402 break; \ 2403 } s; }), 2404 urb->actual_length, urb->transfer_buffer_length); 2405 } 2406 2407 static ssize_t urbs_show(struct device *dev, struct device_attribute *attr, 2408 char *buf) 2409 { 2410 struct usb_hcd *hcd = dev_get_drvdata(dev); 2411 struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd); 2412 struct urbp *urbp; 2413 size_t size = 0; 2414 unsigned long flags; 2415 2416 spin_lock_irqsave(&dum_hcd->dum->lock, flags); 2417 list_for_each_entry(urbp, &dum_hcd->urbp_list, urbp_list) { 2418 size_t temp; 2419 2420 temp = show_urb(buf, PAGE_SIZE - size, urbp->urb); 2421 buf += temp; 2422 size += temp; 2423 } 2424 spin_unlock_irqrestore(&dum_hcd->dum->lock, flags); 2425 2426 return size; 2427 } 2428 static DEVICE_ATTR_RO(urbs); 2429 2430 static int dummy_start_ss(struct dummy_hcd *dum_hcd) 2431 { 2432 timer_setup(&dum_hcd->timer, dummy_timer, 0); 2433 dum_hcd->rh_state = DUMMY_RH_RUNNING; 2434 dum_hcd->stream_en_ep = 0; 2435 INIT_LIST_HEAD(&dum_hcd->urbp_list); 2436 dummy_hcd_to_hcd(dum_hcd)->power_budget = POWER_BUDGET_3; 2437 dummy_hcd_to_hcd(dum_hcd)->state = HC_STATE_RUNNING; 2438 dummy_hcd_to_hcd(dum_hcd)->uses_new_polling = 1; 2439 #ifdef CONFIG_USB_OTG 2440 dummy_hcd_to_hcd(dum_hcd)->self.otg_port = 1; 2441 #endif 2442 return 0; 2443 2444 /* FIXME 'urbs' should be a per-device thing, maybe in usbcore */ 2445 return device_create_file(dummy_dev(dum_hcd), &dev_attr_urbs); 2446 } 2447 2448 static int dummy_start(struct usb_hcd *hcd) 2449 { 2450 struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd); 2451 2452 /* 2453 * MASTER side init ... we emulate a root hub that'll only ever 2454 * talk to one device (the slave side). Also appears in sysfs, 2455 * just like more familiar pci-based HCDs. 2456 */ 2457 if (!usb_hcd_is_primary_hcd(hcd)) 2458 return dummy_start_ss(dum_hcd); 2459 2460 spin_lock_init(&dum_hcd->dum->lock); 2461 timer_setup(&dum_hcd->timer, dummy_timer, 0); 2462 dum_hcd->rh_state = DUMMY_RH_RUNNING; 2463 2464 INIT_LIST_HEAD(&dum_hcd->urbp_list); 2465 2466 hcd->power_budget = POWER_BUDGET; 2467 hcd->state = HC_STATE_RUNNING; 2468 hcd->uses_new_polling = 1; 2469 2470 #ifdef CONFIG_USB_OTG 2471 hcd->self.otg_port = 1; 2472 #endif 2473 2474 /* FIXME 'urbs' should be a per-device thing, maybe in usbcore */ 2475 return device_create_file(dummy_dev(dum_hcd), &dev_attr_urbs); 2476 } 2477 2478 static void dummy_stop(struct usb_hcd *hcd) 2479 { 2480 device_remove_file(dummy_dev(hcd_to_dummy_hcd(hcd)), &dev_attr_urbs); 2481 dev_info(dummy_dev(hcd_to_dummy_hcd(hcd)), "stopped\n"); 2482 } 2483 2484 /*-------------------------------------------------------------------------*/ 2485 2486 static int dummy_h_get_frame(struct usb_hcd *hcd) 2487 { 2488 return dummy_g_get_frame(NULL); 2489 } 2490 2491 static int dummy_setup(struct usb_hcd *hcd) 2492 { 2493 struct dummy *dum; 2494 2495 dum = *((void **)dev_get_platdata(hcd->self.controller)); 2496 hcd->self.sg_tablesize = ~0; 2497 if (usb_hcd_is_primary_hcd(hcd)) { 2498 dum->hs_hcd = hcd_to_dummy_hcd(hcd); 2499 dum->hs_hcd->dum = dum; 2500 /* 2501 * Mark the first roothub as being USB 2.0. 2502 * The USB 3.0 roothub will be registered later by 2503 * dummy_hcd_probe() 2504 */ 2505 hcd->speed = HCD_USB2; 2506 hcd->self.root_hub->speed = USB_SPEED_HIGH; 2507 } else { 2508 dum->ss_hcd = hcd_to_dummy_hcd(hcd); 2509 dum->ss_hcd->dum = dum; 2510 hcd->speed = HCD_USB3; 2511 hcd->self.root_hub->speed = USB_SPEED_SUPER; 2512 } 2513 return 0; 2514 } 2515 2516 /* Change a group of bulk endpoints to support multiple stream IDs */ 2517 static int dummy_alloc_streams(struct usb_hcd *hcd, struct usb_device *udev, 2518 struct usb_host_endpoint **eps, unsigned int num_eps, 2519 unsigned int num_streams, gfp_t mem_flags) 2520 { 2521 struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd); 2522 unsigned long flags; 2523 int max_stream; 2524 int ret_streams = num_streams; 2525 unsigned int index; 2526 unsigned int i; 2527 2528 if (!num_eps) 2529 return -EINVAL; 2530 2531 spin_lock_irqsave(&dum_hcd->dum->lock, flags); 2532 for (i = 0; i < num_eps; i++) { 2533 index = dummy_get_ep_idx(&eps[i]->desc); 2534 if ((1 << index) & dum_hcd->stream_en_ep) { 2535 ret_streams = -EINVAL; 2536 goto out; 2537 } 2538 max_stream = usb_ss_max_streams(&eps[i]->ss_ep_comp); 2539 if (!max_stream) { 2540 ret_streams = -EINVAL; 2541 goto out; 2542 } 2543 if (max_stream < ret_streams) { 2544 dev_dbg(dummy_dev(dum_hcd), "Ep 0x%x only supports %u " 2545 "stream IDs.\n", 2546 eps[i]->desc.bEndpointAddress, 2547 max_stream); 2548 ret_streams = max_stream; 2549 } 2550 } 2551 2552 for (i = 0; i < num_eps; i++) { 2553 index = dummy_get_ep_idx(&eps[i]->desc); 2554 dum_hcd->stream_en_ep |= 1 << index; 2555 set_max_streams_for_pipe(dum_hcd, 2556 usb_endpoint_num(&eps[i]->desc), ret_streams); 2557 } 2558 out: 2559 spin_unlock_irqrestore(&dum_hcd->dum->lock, flags); 2560 return ret_streams; 2561 } 2562 2563 /* Reverts a group of bulk endpoints back to not using stream IDs. */ 2564 static int dummy_free_streams(struct usb_hcd *hcd, struct usb_device *udev, 2565 struct usb_host_endpoint **eps, unsigned int num_eps, 2566 gfp_t mem_flags) 2567 { 2568 struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd); 2569 unsigned long flags; 2570 int ret; 2571 unsigned int index; 2572 unsigned int i; 2573 2574 spin_lock_irqsave(&dum_hcd->dum->lock, flags); 2575 for (i = 0; i < num_eps; i++) { 2576 index = dummy_get_ep_idx(&eps[i]->desc); 2577 if (!((1 << index) & dum_hcd->stream_en_ep)) { 2578 ret = -EINVAL; 2579 goto out; 2580 } 2581 } 2582 2583 for (i = 0; i < num_eps; i++) { 2584 index = dummy_get_ep_idx(&eps[i]->desc); 2585 dum_hcd->stream_en_ep &= ~(1 << index); 2586 set_max_streams_for_pipe(dum_hcd, 2587 usb_endpoint_num(&eps[i]->desc), 0); 2588 } 2589 ret = 0; 2590 out: 2591 spin_unlock_irqrestore(&dum_hcd->dum->lock, flags); 2592 return ret; 2593 } 2594 2595 static struct hc_driver dummy_hcd = { 2596 .description = (char *) driver_name, 2597 .product_desc = "Dummy host controller", 2598 .hcd_priv_size = sizeof(struct dummy_hcd), 2599 2600 .reset = dummy_setup, 2601 .start = dummy_start, 2602 .stop = dummy_stop, 2603 2604 .urb_enqueue = dummy_urb_enqueue, 2605 .urb_dequeue = dummy_urb_dequeue, 2606 2607 .get_frame_number = dummy_h_get_frame, 2608 2609 .hub_status_data = dummy_hub_status, 2610 .hub_control = dummy_hub_control, 2611 .bus_suspend = dummy_bus_suspend, 2612 .bus_resume = dummy_bus_resume, 2613 2614 .alloc_streams = dummy_alloc_streams, 2615 .free_streams = dummy_free_streams, 2616 }; 2617 2618 static int dummy_hcd_probe(struct platform_device *pdev) 2619 { 2620 struct dummy *dum; 2621 struct usb_hcd *hs_hcd; 2622 struct usb_hcd *ss_hcd; 2623 int retval; 2624 2625 dev_info(&pdev->dev, "%s, driver " DRIVER_VERSION "\n", driver_desc); 2626 dum = *((void **)dev_get_platdata(&pdev->dev)); 2627 2628 if (mod_data.is_super_speed) 2629 dummy_hcd.flags = HCD_USB3 | HCD_SHARED; 2630 else if (mod_data.is_high_speed) 2631 dummy_hcd.flags = HCD_USB2; 2632 else 2633 dummy_hcd.flags = HCD_USB11; 2634 hs_hcd = usb_create_hcd(&dummy_hcd, &pdev->dev, dev_name(&pdev->dev)); 2635 if (!hs_hcd) 2636 return -ENOMEM; 2637 hs_hcd->has_tt = 1; 2638 2639 retval = usb_add_hcd(hs_hcd, 0, 0); 2640 if (retval) 2641 goto put_usb2_hcd; 2642 2643 if (mod_data.is_super_speed) { 2644 ss_hcd = usb_create_shared_hcd(&dummy_hcd, &pdev->dev, 2645 dev_name(&pdev->dev), hs_hcd); 2646 if (!ss_hcd) { 2647 retval = -ENOMEM; 2648 goto dealloc_usb2_hcd; 2649 } 2650 2651 retval = usb_add_hcd(ss_hcd, 0, 0); 2652 if (retval) 2653 goto put_usb3_hcd; 2654 } 2655 return 0; 2656 2657 put_usb3_hcd: 2658 usb_put_hcd(ss_hcd); 2659 dealloc_usb2_hcd: 2660 usb_remove_hcd(hs_hcd); 2661 put_usb2_hcd: 2662 usb_put_hcd(hs_hcd); 2663 dum->hs_hcd = dum->ss_hcd = NULL; 2664 return retval; 2665 } 2666 2667 static int dummy_hcd_remove(struct platform_device *pdev) 2668 { 2669 struct dummy *dum; 2670 2671 dum = hcd_to_dummy_hcd(platform_get_drvdata(pdev))->dum; 2672 2673 if (dum->ss_hcd) { 2674 usb_remove_hcd(dummy_hcd_to_hcd(dum->ss_hcd)); 2675 usb_put_hcd(dummy_hcd_to_hcd(dum->ss_hcd)); 2676 } 2677 2678 usb_remove_hcd(dummy_hcd_to_hcd(dum->hs_hcd)); 2679 usb_put_hcd(dummy_hcd_to_hcd(dum->hs_hcd)); 2680 2681 dum->hs_hcd = NULL; 2682 dum->ss_hcd = NULL; 2683 2684 return 0; 2685 } 2686 2687 static int dummy_hcd_suspend(struct platform_device *pdev, pm_message_t state) 2688 { 2689 struct usb_hcd *hcd; 2690 struct dummy_hcd *dum_hcd; 2691 int rc = 0; 2692 2693 dev_dbg(&pdev->dev, "%s\n", __func__); 2694 2695 hcd = platform_get_drvdata(pdev); 2696 dum_hcd = hcd_to_dummy_hcd(hcd); 2697 if (dum_hcd->rh_state == DUMMY_RH_RUNNING) { 2698 dev_warn(&pdev->dev, "Root hub isn't suspended!\n"); 2699 rc = -EBUSY; 2700 } else 2701 clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags); 2702 return rc; 2703 } 2704 2705 static int dummy_hcd_resume(struct platform_device *pdev) 2706 { 2707 struct usb_hcd *hcd; 2708 2709 dev_dbg(&pdev->dev, "%s\n", __func__); 2710 2711 hcd = platform_get_drvdata(pdev); 2712 set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags); 2713 usb_hcd_poll_rh_status(hcd); 2714 return 0; 2715 } 2716 2717 static struct platform_driver dummy_hcd_driver = { 2718 .probe = dummy_hcd_probe, 2719 .remove = dummy_hcd_remove, 2720 .suspend = dummy_hcd_suspend, 2721 .resume = dummy_hcd_resume, 2722 .driver = { 2723 .name = (char *) driver_name, 2724 }, 2725 }; 2726 2727 /*-------------------------------------------------------------------------*/ 2728 #define MAX_NUM_UDC 2 2729 static struct platform_device *the_udc_pdev[MAX_NUM_UDC]; 2730 static struct platform_device *the_hcd_pdev[MAX_NUM_UDC]; 2731 2732 static int __init init(void) 2733 { 2734 int retval = -ENOMEM; 2735 int i; 2736 struct dummy *dum[MAX_NUM_UDC]; 2737 2738 if (usb_disabled()) 2739 return -ENODEV; 2740 2741 if (!mod_data.is_high_speed && mod_data.is_super_speed) 2742 return -EINVAL; 2743 2744 if (mod_data.num < 1 || mod_data.num > MAX_NUM_UDC) { 2745 pr_err("Number of emulated UDC must be in range of 1...%d\n", 2746 MAX_NUM_UDC); 2747 return -EINVAL; 2748 } 2749 2750 for (i = 0; i < mod_data.num; i++) { 2751 the_hcd_pdev[i] = platform_device_alloc(driver_name, i); 2752 if (!the_hcd_pdev[i]) { 2753 i--; 2754 while (i >= 0) 2755 platform_device_put(the_hcd_pdev[i--]); 2756 return retval; 2757 } 2758 } 2759 for (i = 0; i < mod_data.num; i++) { 2760 the_udc_pdev[i] = platform_device_alloc(gadget_name, i); 2761 if (!the_udc_pdev[i]) { 2762 i--; 2763 while (i >= 0) 2764 platform_device_put(the_udc_pdev[i--]); 2765 goto err_alloc_udc; 2766 } 2767 } 2768 for (i = 0; i < mod_data.num; i++) { 2769 dum[i] = kzalloc(sizeof(struct dummy), GFP_KERNEL); 2770 if (!dum[i]) { 2771 retval = -ENOMEM; 2772 goto err_add_pdata; 2773 } 2774 retval = platform_device_add_data(the_hcd_pdev[i], &dum[i], 2775 sizeof(void *)); 2776 if (retval) 2777 goto err_add_pdata; 2778 retval = platform_device_add_data(the_udc_pdev[i], &dum[i], 2779 sizeof(void *)); 2780 if (retval) 2781 goto err_add_pdata; 2782 } 2783 2784 retval = platform_driver_register(&dummy_hcd_driver); 2785 if (retval < 0) 2786 goto err_add_pdata; 2787 retval = platform_driver_register(&dummy_udc_driver); 2788 if (retval < 0) 2789 goto err_register_udc_driver; 2790 2791 for (i = 0; i < mod_data.num; i++) { 2792 retval = platform_device_add(the_hcd_pdev[i]); 2793 if (retval < 0) { 2794 i--; 2795 while (i >= 0) 2796 platform_device_del(the_hcd_pdev[i--]); 2797 goto err_add_hcd; 2798 } 2799 } 2800 for (i = 0; i < mod_data.num; i++) { 2801 if (!dum[i]->hs_hcd || 2802 (!dum[i]->ss_hcd && mod_data.is_super_speed)) { 2803 /* 2804 * The hcd was added successfully but its probe 2805 * function failed for some reason. 2806 */ 2807 retval = -EINVAL; 2808 goto err_add_udc; 2809 } 2810 } 2811 2812 for (i = 0; i < mod_data.num; i++) { 2813 retval = platform_device_add(the_udc_pdev[i]); 2814 if (retval < 0) { 2815 i--; 2816 while (i >= 0) 2817 platform_device_del(the_udc_pdev[i--]); 2818 goto err_add_udc; 2819 } 2820 } 2821 2822 for (i = 0; i < mod_data.num; i++) { 2823 if (!platform_get_drvdata(the_udc_pdev[i])) { 2824 /* 2825 * The udc was added successfully but its probe 2826 * function failed for some reason. 2827 */ 2828 retval = -EINVAL; 2829 goto err_probe_udc; 2830 } 2831 } 2832 return retval; 2833 2834 err_probe_udc: 2835 for (i = 0; i < mod_data.num; i++) 2836 platform_device_del(the_udc_pdev[i]); 2837 err_add_udc: 2838 for (i = 0; i < mod_data.num; i++) 2839 platform_device_del(the_hcd_pdev[i]); 2840 err_add_hcd: 2841 platform_driver_unregister(&dummy_udc_driver); 2842 err_register_udc_driver: 2843 platform_driver_unregister(&dummy_hcd_driver); 2844 err_add_pdata: 2845 for (i = 0; i < mod_data.num; i++) 2846 kfree(dum[i]); 2847 for (i = 0; i < mod_data.num; i++) 2848 platform_device_put(the_udc_pdev[i]); 2849 err_alloc_udc: 2850 for (i = 0; i < mod_data.num; i++) 2851 platform_device_put(the_hcd_pdev[i]); 2852 return retval; 2853 } 2854 module_init(init); 2855 2856 static void __exit cleanup(void) 2857 { 2858 int i; 2859 2860 for (i = 0; i < mod_data.num; i++) { 2861 struct dummy *dum; 2862 2863 dum = *((void **)dev_get_platdata(&the_udc_pdev[i]->dev)); 2864 2865 platform_device_unregister(the_udc_pdev[i]); 2866 platform_device_unregister(the_hcd_pdev[i]); 2867 kfree(dum); 2868 } 2869 platform_driver_unregister(&dummy_udc_driver); 2870 platform_driver_unregister(&dummy_hcd_driver); 2871 } 2872 module_exit(cleanup); 2873