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 52 static const char driver_name[] = "dummy_hcd"; 53 static const char driver_desc[] = "USB Host+Gadget Emulator"; 54 55 static const char gadget_name[] = "dummy_udc"; 56 57 MODULE_DESCRIPTION(DRIVER_DESC); 58 MODULE_AUTHOR("David Brownell"); 59 MODULE_LICENSE("GPL"); 60 61 struct dummy_hcd_module_parameters { 62 bool is_super_speed; 63 bool is_high_speed; 64 unsigned int num; 65 }; 66 67 static struct dummy_hcd_module_parameters mod_data = { 68 .is_super_speed = false, 69 .is_high_speed = true, 70 .num = 1, 71 }; 72 module_param_named(is_super_speed, mod_data.is_super_speed, bool, S_IRUGO); 73 MODULE_PARM_DESC(is_super_speed, "true to simulate SuperSpeed connection"); 74 module_param_named(is_high_speed, mod_data.is_high_speed, bool, S_IRUGO); 75 MODULE_PARM_DESC(is_high_speed, "true to simulate HighSpeed connection"); 76 module_param_named(num, mod_data.num, uint, S_IRUGO); 77 MODULE_PARM_DESC(num, "number of emulated controllers"); 78 /*-------------------------------------------------------------------------*/ 79 80 /* gadget side driver data structres */ 81 struct dummy_ep { 82 struct list_head queue; 83 unsigned long last_io; /* jiffies timestamp */ 84 struct usb_gadget *gadget; 85 const struct usb_endpoint_descriptor *desc; 86 struct usb_ep ep; 87 unsigned halted:1; 88 unsigned wedged:1; 89 unsigned already_seen:1; 90 unsigned setup_stage:1; 91 unsigned stream_en:1; 92 }; 93 94 struct dummy_request { 95 struct list_head queue; /* ep's requests */ 96 struct usb_request req; 97 }; 98 99 static inline struct dummy_ep *usb_ep_to_dummy_ep(struct usb_ep *_ep) 100 { 101 return container_of(_ep, struct dummy_ep, ep); 102 } 103 104 static inline struct dummy_request *usb_request_to_dummy_request 105 (struct usb_request *_req) 106 { 107 return container_of(_req, struct dummy_request, req); 108 } 109 110 /*-------------------------------------------------------------------------*/ 111 112 /* 113 * Every device has ep0 for control requests, plus up to 30 more endpoints, 114 * in one of two types: 115 * 116 * - Configurable: direction (in/out), type (bulk, iso, etc), and endpoint 117 * number can be changed. Names like "ep-a" are used for this type. 118 * 119 * - Fixed Function: in other cases. some characteristics may be mutable; 120 * that'd be hardware-specific. Names like "ep12out-bulk" are used. 121 * 122 * Gadget drivers are responsible for not setting up conflicting endpoint 123 * configurations, illegal or unsupported packet lengths, and so on. 124 */ 125 126 static const char ep0name[] = "ep0"; 127 128 static const struct { 129 const char *name; 130 const struct usb_ep_caps caps; 131 } ep_info[] = { 132 #define EP_INFO(_name, _caps) \ 133 { \ 134 .name = _name, \ 135 .caps = _caps, \ 136 } 137 138 /* we don't provide isochronous endpoints since we don't support them */ 139 #define TYPE_BULK_OR_INT (USB_EP_CAPS_TYPE_BULK | USB_EP_CAPS_TYPE_INT) 140 141 /* everyone has ep0 */ 142 EP_INFO(ep0name, 143 USB_EP_CAPS(USB_EP_CAPS_TYPE_CONTROL, USB_EP_CAPS_DIR_ALL)), 144 /* act like a pxa250: fifteen fixed function endpoints */ 145 EP_INFO("ep1in-bulk", 146 USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, USB_EP_CAPS_DIR_IN)), 147 EP_INFO("ep2out-bulk", 148 USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, USB_EP_CAPS_DIR_OUT)), 149 /* 150 EP_INFO("ep3in-iso", 151 USB_EP_CAPS(USB_EP_CAPS_TYPE_ISO, USB_EP_CAPS_DIR_IN)), 152 EP_INFO("ep4out-iso", 153 USB_EP_CAPS(USB_EP_CAPS_TYPE_ISO, USB_EP_CAPS_DIR_OUT)), 154 */ 155 EP_INFO("ep5in-int", 156 USB_EP_CAPS(USB_EP_CAPS_TYPE_INT, USB_EP_CAPS_DIR_IN)), 157 EP_INFO("ep6in-bulk", 158 USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, USB_EP_CAPS_DIR_IN)), 159 EP_INFO("ep7out-bulk", 160 USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, USB_EP_CAPS_DIR_OUT)), 161 /* 162 EP_INFO("ep8in-iso", 163 USB_EP_CAPS(USB_EP_CAPS_TYPE_ISO, USB_EP_CAPS_DIR_IN)), 164 EP_INFO("ep9out-iso", 165 USB_EP_CAPS(USB_EP_CAPS_TYPE_ISO, USB_EP_CAPS_DIR_OUT)), 166 */ 167 EP_INFO("ep10in-int", 168 USB_EP_CAPS(USB_EP_CAPS_TYPE_INT, USB_EP_CAPS_DIR_IN)), 169 EP_INFO("ep11in-bulk", 170 USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, USB_EP_CAPS_DIR_IN)), 171 EP_INFO("ep12out-bulk", 172 USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, USB_EP_CAPS_DIR_OUT)), 173 /* 174 EP_INFO("ep13in-iso", 175 USB_EP_CAPS(USB_EP_CAPS_TYPE_ISO, USB_EP_CAPS_DIR_IN)), 176 EP_INFO("ep14out-iso", 177 USB_EP_CAPS(USB_EP_CAPS_TYPE_ISO, USB_EP_CAPS_DIR_OUT)), 178 */ 179 EP_INFO("ep15in-int", 180 USB_EP_CAPS(USB_EP_CAPS_TYPE_INT, USB_EP_CAPS_DIR_IN)), 181 182 /* or like sa1100: two fixed function endpoints */ 183 EP_INFO("ep1out-bulk", 184 USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, USB_EP_CAPS_DIR_OUT)), 185 EP_INFO("ep2in-bulk", 186 USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, USB_EP_CAPS_DIR_IN)), 187 188 /* and now some generic EPs so we have enough in multi config */ 189 EP_INFO("ep3out", 190 USB_EP_CAPS(TYPE_BULK_OR_INT, USB_EP_CAPS_DIR_OUT)), 191 EP_INFO("ep4in", 192 USB_EP_CAPS(TYPE_BULK_OR_INT, USB_EP_CAPS_DIR_IN)), 193 EP_INFO("ep5out", 194 USB_EP_CAPS(TYPE_BULK_OR_INT, USB_EP_CAPS_DIR_OUT)), 195 EP_INFO("ep6out", 196 USB_EP_CAPS(TYPE_BULK_OR_INT, USB_EP_CAPS_DIR_OUT)), 197 EP_INFO("ep7in", 198 USB_EP_CAPS(TYPE_BULK_OR_INT, USB_EP_CAPS_DIR_IN)), 199 EP_INFO("ep8out", 200 USB_EP_CAPS(TYPE_BULK_OR_INT, USB_EP_CAPS_DIR_OUT)), 201 EP_INFO("ep9in", 202 USB_EP_CAPS(TYPE_BULK_OR_INT, USB_EP_CAPS_DIR_IN)), 203 EP_INFO("ep10out", 204 USB_EP_CAPS(TYPE_BULK_OR_INT, USB_EP_CAPS_DIR_OUT)), 205 EP_INFO("ep11out", 206 USB_EP_CAPS(TYPE_BULK_OR_INT, USB_EP_CAPS_DIR_OUT)), 207 EP_INFO("ep12in", 208 USB_EP_CAPS(TYPE_BULK_OR_INT, USB_EP_CAPS_DIR_IN)), 209 EP_INFO("ep13out", 210 USB_EP_CAPS(TYPE_BULK_OR_INT, USB_EP_CAPS_DIR_OUT)), 211 EP_INFO("ep14in", 212 USB_EP_CAPS(TYPE_BULK_OR_INT, USB_EP_CAPS_DIR_IN)), 213 EP_INFO("ep15out", 214 USB_EP_CAPS(TYPE_BULK_OR_INT, USB_EP_CAPS_DIR_OUT)), 215 216 #undef EP_INFO 217 }; 218 219 #define DUMMY_ENDPOINTS ARRAY_SIZE(ep_info) 220 221 /*-------------------------------------------------------------------------*/ 222 223 #define FIFO_SIZE 64 224 225 struct urbp { 226 struct urb *urb; 227 struct list_head urbp_list; 228 struct sg_mapping_iter miter; 229 u32 miter_started; 230 }; 231 232 233 enum dummy_rh_state { 234 DUMMY_RH_RESET, 235 DUMMY_RH_SUSPENDED, 236 DUMMY_RH_RUNNING 237 }; 238 239 struct dummy_hcd { 240 struct dummy *dum; 241 enum dummy_rh_state rh_state; 242 struct timer_list timer; 243 u32 port_status; 244 u32 old_status; 245 unsigned long re_timeout; 246 247 struct usb_device *udev; 248 struct list_head urbp_list; 249 struct urbp *next_frame_urbp; 250 251 u32 stream_en_ep; 252 u8 num_stream[30 / 2]; 253 254 unsigned active:1; 255 unsigned old_active:1; 256 unsigned resuming:1; 257 }; 258 259 struct dummy { 260 spinlock_t lock; 261 262 /* 263 * SLAVE/GADGET side support 264 */ 265 struct dummy_ep ep[DUMMY_ENDPOINTS]; 266 int address; 267 int callback_usage; 268 struct usb_gadget gadget; 269 struct usb_gadget_driver *driver; 270 struct dummy_request fifo_req; 271 u8 fifo_buf[FIFO_SIZE]; 272 u16 devstatus; 273 unsigned ints_enabled:1; 274 unsigned udc_suspended:1; 275 unsigned pullup:1; 276 277 /* 278 * MASTER/HOST side support 279 */ 280 struct dummy_hcd *hs_hcd; 281 struct dummy_hcd *ss_hcd; 282 }; 283 284 static inline struct dummy_hcd *hcd_to_dummy_hcd(struct usb_hcd *hcd) 285 { 286 return (struct dummy_hcd *) (hcd->hcd_priv); 287 } 288 289 static inline struct usb_hcd *dummy_hcd_to_hcd(struct dummy_hcd *dum) 290 { 291 return container_of((void *) dum, struct usb_hcd, hcd_priv); 292 } 293 294 static inline struct device *dummy_dev(struct dummy_hcd *dum) 295 { 296 return dummy_hcd_to_hcd(dum)->self.controller; 297 } 298 299 static inline struct device *udc_dev(struct dummy *dum) 300 { 301 return dum->gadget.dev.parent; 302 } 303 304 static inline struct dummy *ep_to_dummy(struct dummy_ep *ep) 305 { 306 return container_of(ep->gadget, struct dummy, gadget); 307 } 308 309 static inline struct dummy_hcd *gadget_to_dummy_hcd(struct usb_gadget *gadget) 310 { 311 struct dummy *dum = container_of(gadget, struct dummy, gadget); 312 if (dum->gadget.speed == USB_SPEED_SUPER) 313 return dum->ss_hcd; 314 else 315 return dum->hs_hcd; 316 } 317 318 static inline struct dummy *gadget_dev_to_dummy(struct device *dev) 319 { 320 return container_of(dev, struct dummy, gadget.dev); 321 } 322 323 /*-------------------------------------------------------------------------*/ 324 325 /* SLAVE/GADGET SIDE UTILITY ROUTINES */ 326 327 /* called with spinlock held */ 328 static void nuke(struct dummy *dum, struct dummy_ep *ep) 329 { 330 while (!list_empty(&ep->queue)) { 331 struct dummy_request *req; 332 333 req = list_entry(ep->queue.next, struct dummy_request, queue); 334 list_del_init(&req->queue); 335 req->req.status = -ESHUTDOWN; 336 337 spin_unlock(&dum->lock); 338 usb_gadget_giveback_request(&ep->ep, &req->req); 339 spin_lock(&dum->lock); 340 } 341 } 342 343 /* caller must hold lock */ 344 static void stop_activity(struct dummy *dum) 345 { 346 int i; 347 348 /* prevent any more requests */ 349 dum->address = 0; 350 351 /* The timer is left running so that outstanding URBs can fail */ 352 353 /* nuke any pending requests first, so driver i/o is quiesced */ 354 for (i = 0; i < DUMMY_ENDPOINTS; ++i) 355 nuke(dum, &dum->ep[i]); 356 357 /* driver now does any non-usb quiescing necessary */ 358 } 359 360 /** 361 * set_link_state_by_speed() - Sets the current state of the link according to 362 * the hcd speed 363 * @dum_hcd: pointer to the dummy_hcd structure to update the link state for 364 * 365 * This function updates the port_status according to the link state and the 366 * speed of the hcd. 367 */ 368 static void set_link_state_by_speed(struct dummy_hcd *dum_hcd) 369 { 370 struct dummy *dum = dum_hcd->dum; 371 372 if (dummy_hcd_to_hcd(dum_hcd)->speed == HCD_USB3) { 373 if ((dum_hcd->port_status & USB_SS_PORT_STAT_POWER) == 0) { 374 dum_hcd->port_status = 0; 375 } else if (!dum->pullup || dum->udc_suspended) { 376 /* UDC suspend must cause a disconnect */ 377 dum_hcd->port_status &= ~(USB_PORT_STAT_CONNECTION | 378 USB_PORT_STAT_ENABLE); 379 if ((dum_hcd->old_status & 380 USB_PORT_STAT_CONNECTION) != 0) 381 dum_hcd->port_status |= 382 (USB_PORT_STAT_C_CONNECTION << 16); 383 } else { 384 /* device is connected and not suspended */ 385 dum_hcd->port_status |= (USB_PORT_STAT_CONNECTION | 386 USB_PORT_STAT_SPEED_5GBPS) ; 387 if ((dum_hcd->old_status & 388 USB_PORT_STAT_CONNECTION) == 0) 389 dum_hcd->port_status |= 390 (USB_PORT_STAT_C_CONNECTION << 16); 391 if ((dum_hcd->port_status & USB_PORT_STAT_ENABLE) && 392 (dum_hcd->port_status & 393 USB_PORT_STAT_LINK_STATE) == USB_SS_PORT_LS_U0 && 394 dum_hcd->rh_state != DUMMY_RH_SUSPENDED) 395 dum_hcd->active = 1; 396 } 397 } else { 398 if ((dum_hcd->port_status & USB_PORT_STAT_POWER) == 0) { 399 dum_hcd->port_status = 0; 400 } else if (!dum->pullup || dum->udc_suspended) { 401 /* UDC suspend must cause a disconnect */ 402 dum_hcd->port_status &= ~(USB_PORT_STAT_CONNECTION | 403 USB_PORT_STAT_ENABLE | 404 USB_PORT_STAT_LOW_SPEED | 405 USB_PORT_STAT_HIGH_SPEED | 406 USB_PORT_STAT_SUSPEND); 407 if ((dum_hcd->old_status & 408 USB_PORT_STAT_CONNECTION) != 0) 409 dum_hcd->port_status |= 410 (USB_PORT_STAT_C_CONNECTION << 16); 411 } else { 412 dum_hcd->port_status |= USB_PORT_STAT_CONNECTION; 413 if ((dum_hcd->old_status & 414 USB_PORT_STAT_CONNECTION) == 0) 415 dum_hcd->port_status |= 416 (USB_PORT_STAT_C_CONNECTION << 16); 417 if ((dum_hcd->port_status & USB_PORT_STAT_ENABLE) == 0) 418 dum_hcd->port_status &= ~USB_PORT_STAT_SUSPEND; 419 else if ((dum_hcd->port_status & 420 USB_PORT_STAT_SUSPEND) == 0 && 421 dum_hcd->rh_state != DUMMY_RH_SUSPENDED) 422 dum_hcd->active = 1; 423 } 424 } 425 } 426 427 /* caller must hold lock */ 428 static void set_link_state(struct dummy_hcd *dum_hcd) 429 { 430 struct dummy *dum = dum_hcd->dum; 431 unsigned int power_bit; 432 433 dum_hcd->active = 0; 434 if (dum->pullup) 435 if ((dummy_hcd_to_hcd(dum_hcd)->speed == HCD_USB3 && 436 dum->gadget.speed != USB_SPEED_SUPER) || 437 (dummy_hcd_to_hcd(dum_hcd)->speed != HCD_USB3 && 438 dum->gadget.speed == USB_SPEED_SUPER)) 439 return; 440 441 set_link_state_by_speed(dum_hcd); 442 power_bit = (dummy_hcd_to_hcd(dum_hcd)->speed == HCD_USB3 ? 443 USB_SS_PORT_STAT_POWER : USB_PORT_STAT_POWER); 444 445 if ((dum_hcd->port_status & USB_PORT_STAT_ENABLE) == 0 || 446 dum_hcd->active) 447 dum_hcd->resuming = 0; 448 449 /* Currently !connected or in reset */ 450 if ((dum_hcd->port_status & power_bit) == 0 || 451 (dum_hcd->port_status & USB_PORT_STAT_RESET) != 0) { 452 unsigned int disconnect = power_bit & 453 dum_hcd->old_status & (~dum_hcd->port_status); 454 unsigned int reset = USB_PORT_STAT_RESET & 455 (~dum_hcd->old_status) & dum_hcd->port_status; 456 457 /* Report reset and disconnect events to the driver */ 458 if (dum->ints_enabled && (disconnect || reset)) { 459 stop_activity(dum); 460 ++dum->callback_usage; 461 spin_unlock(&dum->lock); 462 if (reset) 463 usb_gadget_udc_reset(&dum->gadget, dum->driver); 464 else 465 dum->driver->disconnect(&dum->gadget); 466 spin_lock(&dum->lock); 467 --dum->callback_usage; 468 } 469 } else if (dum_hcd->active != dum_hcd->old_active && 470 dum->ints_enabled) { 471 ++dum->callback_usage; 472 spin_unlock(&dum->lock); 473 if (dum_hcd->old_active && dum->driver->suspend) 474 dum->driver->suspend(&dum->gadget); 475 else if (!dum_hcd->old_active && dum->driver->resume) 476 dum->driver->resume(&dum->gadget); 477 spin_lock(&dum->lock); 478 --dum->callback_usage; 479 } 480 481 dum_hcd->old_status = dum_hcd->port_status; 482 dum_hcd->old_active = dum_hcd->active; 483 } 484 485 /*-------------------------------------------------------------------------*/ 486 487 /* SLAVE/GADGET SIDE DRIVER 488 * 489 * This only tracks gadget state. All the work is done when the host 490 * side tries some (emulated) i/o operation. Real device controller 491 * drivers would do real i/o using dma, fifos, irqs, timers, etc. 492 */ 493 494 #define is_enabled(dum) \ 495 (dum->port_status & USB_PORT_STAT_ENABLE) 496 497 static int dummy_enable(struct usb_ep *_ep, 498 const struct usb_endpoint_descriptor *desc) 499 { 500 struct dummy *dum; 501 struct dummy_hcd *dum_hcd; 502 struct dummy_ep *ep; 503 unsigned max; 504 int retval; 505 506 ep = usb_ep_to_dummy_ep(_ep); 507 if (!_ep || !desc || ep->desc || _ep->name == ep0name 508 || desc->bDescriptorType != USB_DT_ENDPOINT) 509 return -EINVAL; 510 dum = ep_to_dummy(ep); 511 if (!dum->driver) 512 return -ESHUTDOWN; 513 514 dum_hcd = gadget_to_dummy_hcd(&dum->gadget); 515 if (!is_enabled(dum_hcd)) 516 return -ESHUTDOWN; 517 518 /* 519 * For HS/FS devices only bits 0..10 of the wMaxPacketSize represent the 520 * maximum packet size. 521 * For SS devices the wMaxPacketSize is limited by 1024. 522 */ 523 max = usb_endpoint_maxp(desc); 524 525 /* drivers must not request bad settings, since lower levels 526 * (hardware or its drivers) may not check. some endpoints 527 * can't do iso, many have maxpacket limitations, etc. 528 * 529 * since this "hardware" driver is here to help debugging, we 530 * have some extra sanity checks. (there could be more though, 531 * especially for "ep9out" style fixed function ones.) 532 */ 533 retval = -EINVAL; 534 switch (usb_endpoint_type(desc)) { 535 case USB_ENDPOINT_XFER_BULK: 536 if (strstr(ep->ep.name, "-iso") 537 || strstr(ep->ep.name, "-int")) { 538 goto done; 539 } 540 switch (dum->gadget.speed) { 541 case USB_SPEED_SUPER: 542 if (max == 1024) 543 break; 544 goto done; 545 case USB_SPEED_HIGH: 546 if (max == 512) 547 break; 548 goto done; 549 case USB_SPEED_FULL: 550 if (max == 8 || max == 16 || max == 32 || max == 64) 551 /* we'll fake any legal size */ 552 break; 553 /* save a return statement */ 554 default: 555 goto done; 556 } 557 break; 558 case USB_ENDPOINT_XFER_INT: 559 if (strstr(ep->ep.name, "-iso")) /* bulk is ok */ 560 goto done; 561 /* real hardware might not handle all packet sizes */ 562 switch (dum->gadget.speed) { 563 case USB_SPEED_SUPER: 564 case USB_SPEED_HIGH: 565 if (max <= 1024) 566 break; 567 /* save a return statement */ 568 /* fall through */ 569 case USB_SPEED_FULL: 570 if (max <= 64) 571 break; 572 /* save a return statement */ 573 /* fall through */ 574 default: 575 if (max <= 8) 576 break; 577 goto done; 578 } 579 break; 580 case USB_ENDPOINT_XFER_ISOC: 581 if (strstr(ep->ep.name, "-bulk") 582 || strstr(ep->ep.name, "-int")) 583 goto done; 584 /* real hardware might not handle all packet sizes */ 585 switch (dum->gadget.speed) { 586 case USB_SPEED_SUPER: 587 case USB_SPEED_HIGH: 588 if (max <= 1024) 589 break; 590 /* save a return statement */ 591 /* fall through */ 592 case USB_SPEED_FULL: 593 if (max <= 1023) 594 break; 595 /* save a return statement */ 596 default: 597 goto done; 598 } 599 break; 600 default: 601 /* few chips support control except on ep0 */ 602 goto done; 603 } 604 605 _ep->maxpacket = max; 606 if (usb_ss_max_streams(_ep->comp_desc)) { 607 if (!usb_endpoint_xfer_bulk(desc)) { 608 dev_err(udc_dev(dum), "Can't enable stream support on " 609 "non-bulk ep %s\n", _ep->name); 610 return -EINVAL; 611 } 612 ep->stream_en = 1; 613 } 614 ep->desc = desc; 615 616 dev_dbg(udc_dev(dum), "enabled %s (ep%d%s-%s) maxpacket %d stream %s\n", 617 _ep->name, 618 desc->bEndpointAddress & 0x0f, 619 (desc->bEndpointAddress & USB_DIR_IN) ? "in" : "out", 620 usb_ep_type_string(usb_endpoint_type(desc)), 621 max, ep->stream_en ? "enabled" : "disabled"); 622 623 /* at this point real hardware should be NAKing transfers 624 * to that endpoint, until a buffer is queued to it. 625 */ 626 ep->halted = ep->wedged = 0; 627 retval = 0; 628 done: 629 return retval; 630 } 631 632 static int dummy_disable(struct usb_ep *_ep) 633 { 634 struct dummy_ep *ep; 635 struct dummy *dum; 636 unsigned long flags; 637 638 ep = usb_ep_to_dummy_ep(_ep); 639 if (!_ep || !ep->desc || _ep->name == ep0name) 640 return -EINVAL; 641 dum = ep_to_dummy(ep); 642 643 spin_lock_irqsave(&dum->lock, flags); 644 ep->desc = NULL; 645 ep->stream_en = 0; 646 nuke(dum, ep); 647 spin_unlock_irqrestore(&dum->lock, flags); 648 649 dev_dbg(udc_dev(dum), "disabled %s\n", _ep->name); 650 return 0; 651 } 652 653 static struct usb_request *dummy_alloc_request(struct usb_ep *_ep, 654 gfp_t mem_flags) 655 { 656 struct dummy_request *req; 657 658 if (!_ep) 659 return NULL; 660 661 req = kzalloc(sizeof(*req), mem_flags); 662 if (!req) 663 return NULL; 664 INIT_LIST_HEAD(&req->queue); 665 return &req->req; 666 } 667 668 static void dummy_free_request(struct usb_ep *_ep, struct usb_request *_req) 669 { 670 struct dummy_request *req; 671 672 if (!_ep || !_req) { 673 WARN_ON(1); 674 return; 675 } 676 677 req = usb_request_to_dummy_request(_req); 678 WARN_ON(!list_empty(&req->queue)); 679 kfree(req); 680 } 681 682 static void fifo_complete(struct usb_ep *ep, struct usb_request *req) 683 { 684 } 685 686 static int dummy_queue(struct usb_ep *_ep, struct usb_request *_req, 687 gfp_t mem_flags) 688 { 689 struct dummy_ep *ep; 690 struct dummy_request *req; 691 struct dummy *dum; 692 struct dummy_hcd *dum_hcd; 693 unsigned long flags; 694 695 req = usb_request_to_dummy_request(_req); 696 if (!_req || !list_empty(&req->queue) || !_req->complete) 697 return -EINVAL; 698 699 ep = usb_ep_to_dummy_ep(_ep); 700 if (!_ep || (!ep->desc && _ep->name != ep0name)) 701 return -EINVAL; 702 703 dum = ep_to_dummy(ep); 704 dum_hcd = gadget_to_dummy_hcd(&dum->gadget); 705 if (!dum->driver || !is_enabled(dum_hcd)) 706 return -ESHUTDOWN; 707 708 #if 0 709 dev_dbg(udc_dev(dum), "ep %p queue req %p to %s, len %d buf %p\n", 710 ep, _req, _ep->name, _req->length, _req->buf); 711 #endif 712 _req->status = -EINPROGRESS; 713 _req->actual = 0; 714 spin_lock_irqsave(&dum->lock, flags); 715 716 /* implement an emulated single-request FIFO */ 717 if (ep->desc && (ep->desc->bEndpointAddress & USB_DIR_IN) && 718 list_empty(&dum->fifo_req.queue) && 719 list_empty(&ep->queue) && 720 _req->length <= FIFO_SIZE) { 721 req = &dum->fifo_req; 722 req->req = *_req; 723 req->req.buf = dum->fifo_buf; 724 memcpy(dum->fifo_buf, _req->buf, _req->length); 725 req->req.context = dum; 726 req->req.complete = fifo_complete; 727 728 list_add_tail(&req->queue, &ep->queue); 729 spin_unlock(&dum->lock); 730 _req->actual = _req->length; 731 _req->status = 0; 732 usb_gadget_giveback_request(_ep, _req); 733 spin_lock(&dum->lock); 734 } else 735 list_add_tail(&req->queue, &ep->queue); 736 spin_unlock_irqrestore(&dum->lock, flags); 737 738 /* real hardware would likely enable transfers here, in case 739 * it'd been left NAKing. 740 */ 741 return 0; 742 } 743 744 static int dummy_dequeue(struct usb_ep *_ep, struct usb_request *_req) 745 { 746 struct dummy_ep *ep; 747 struct dummy *dum; 748 int retval = -EINVAL; 749 unsigned long flags; 750 struct dummy_request *req = NULL; 751 752 if (!_ep || !_req) 753 return retval; 754 ep = usb_ep_to_dummy_ep(_ep); 755 dum = ep_to_dummy(ep); 756 757 if (!dum->driver) 758 return -ESHUTDOWN; 759 760 local_irq_save(flags); 761 spin_lock(&dum->lock); 762 list_for_each_entry(req, &ep->queue, queue) { 763 if (&req->req == _req) { 764 list_del_init(&req->queue); 765 _req->status = -ECONNRESET; 766 retval = 0; 767 break; 768 } 769 } 770 spin_unlock(&dum->lock); 771 772 if (retval == 0) { 773 dev_dbg(udc_dev(dum), 774 "dequeued req %p from %s, len %d buf %p\n", 775 req, _ep->name, _req->length, _req->buf); 776 usb_gadget_giveback_request(_ep, _req); 777 } 778 local_irq_restore(flags); 779 return retval; 780 } 781 782 static int 783 dummy_set_halt_and_wedge(struct usb_ep *_ep, int value, int wedged) 784 { 785 struct dummy_ep *ep; 786 struct dummy *dum; 787 788 if (!_ep) 789 return -EINVAL; 790 ep = usb_ep_to_dummy_ep(_ep); 791 dum = ep_to_dummy(ep); 792 if (!dum->driver) 793 return -ESHUTDOWN; 794 if (!value) 795 ep->halted = ep->wedged = 0; 796 else if (ep->desc && (ep->desc->bEndpointAddress & USB_DIR_IN) && 797 !list_empty(&ep->queue)) 798 return -EAGAIN; 799 else { 800 ep->halted = 1; 801 if (wedged) 802 ep->wedged = 1; 803 } 804 /* FIXME clear emulated data toggle too */ 805 return 0; 806 } 807 808 static int 809 dummy_set_halt(struct usb_ep *_ep, int value) 810 { 811 return dummy_set_halt_and_wedge(_ep, value, 0); 812 } 813 814 static int dummy_set_wedge(struct usb_ep *_ep) 815 { 816 if (!_ep || _ep->name == ep0name) 817 return -EINVAL; 818 return dummy_set_halt_and_wedge(_ep, 1, 1); 819 } 820 821 static const struct usb_ep_ops dummy_ep_ops = { 822 .enable = dummy_enable, 823 .disable = dummy_disable, 824 825 .alloc_request = dummy_alloc_request, 826 .free_request = dummy_free_request, 827 828 .queue = dummy_queue, 829 .dequeue = dummy_dequeue, 830 831 .set_halt = dummy_set_halt, 832 .set_wedge = dummy_set_wedge, 833 }; 834 835 /*-------------------------------------------------------------------------*/ 836 837 /* there are both host and device side versions of this call ... */ 838 static int dummy_g_get_frame(struct usb_gadget *_gadget) 839 { 840 struct timespec64 ts64; 841 842 ktime_get_ts64(&ts64); 843 return ts64.tv_nsec / NSEC_PER_MSEC; 844 } 845 846 static int dummy_wakeup(struct usb_gadget *_gadget) 847 { 848 struct dummy_hcd *dum_hcd; 849 850 dum_hcd = gadget_to_dummy_hcd(_gadget); 851 if (!(dum_hcd->dum->devstatus & ((1 << USB_DEVICE_B_HNP_ENABLE) 852 | (1 << USB_DEVICE_REMOTE_WAKEUP)))) 853 return -EINVAL; 854 if ((dum_hcd->port_status & USB_PORT_STAT_CONNECTION) == 0) 855 return -ENOLINK; 856 if ((dum_hcd->port_status & USB_PORT_STAT_SUSPEND) == 0 && 857 dum_hcd->rh_state != DUMMY_RH_SUSPENDED) 858 return -EIO; 859 860 /* FIXME: What if the root hub is suspended but the port isn't? */ 861 862 /* hub notices our request, issues downstream resume, etc */ 863 dum_hcd->resuming = 1; 864 dum_hcd->re_timeout = jiffies + msecs_to_jiffies(20); 865 mod_timer(&dummy_hcd_to_hcd(dum_hcd)->rh_timer, dum_hcd->re_timeout); 866 return 0; 867 } 868 869 static int dummy_set_selfpowered(struct usb_gadget *_gadget, int value) 870 { 871 struct dummy *dum; 872 873 _gadget->is_selfpowered = (value != 0); 874 dum = gadget_to_dummy_hcd(_gadget)->dum; 875 if (value) 876 dum->devstatus |= (1 << USB_DEVICE_SELF_POWERED); 877 else 878 dum->devstatus &= ~(1 << USB_DEVICE_SELF_POWERED); 879 return 0; 880 } 881 882 static void dummy_udc_update_ep0(struct dummy *dum) 883 { 884 if (dum->gadget.speed == USB_SPEED_SUPER) 885 dum->ep[0].ep.maxpacket = 9; 886 else 887 dum->ep[0].ep.maxpacket = 64; 888 } 889 890 static int dummy_pullup(struct usb_gadget *_gadget, int value) 891 { 892 struct dummy_hcd *dum_hcd; 893 struct dummy *dum; 894 unsigned long flags; 895 896 dum = gadget_dev_to_dummy(&_gadget->dev); 897 dum_hcd = gadget_to_dummy_hcd(_gadget); 898 899 spin_lock_irqsave(&dum->lock, flags); 900 dum->pullup = (value != 0); 901 set_link_state(dum_hcd); 902 spin_unlock_irqrestore(&dum->lock, flags); 903 904 usb_hcd_poll_rh_status(dummy_hcd_to_hcd(dum_hcd)); 905 return 0; 906 } 907 908 static void dummy_udc_set_speed(struct usb_gadget *_gadget, 909 enum usb_device_speed speed) 910 { 911 struct dummy *dum; 912 913 dum = gadget_dev_to_dummy(&_gadget->dev); 914 dum->gadget.speed = speed; 915 dummy_udc_update_ep0(dum); 916 } 917 918 static int dummy_udc_start(struct usb_gadget *g, 919 struct usb_gadget_driver *driver); 920 static int dummy_udc_stop(struct usb_gadget *g); 921 922 static const struct usb_gadget_ops dummy_ops = { 923 .get_frame = dummy_g_get_frame, 924 .wakeup = dummy_wakeup, 925 .set_selfpowered = dummy_set_selfpowered, 926 .pullup = dummy_pullup, 927 .udc_start = dummy_udc_start, 928 .udc_stop = dummy_udc_stop, 929 .udc_set_speed = dummy_udc_set_speed, 930 }; 931 932 /*-------------------------------------------------------------------------*/ 933 934 /* "function" sysfs attribute */ 935 static ssize_t function_show(struct device *dev, struct device_attribute *attr, 936 char *buf) 937 { 938 struct dummy *dum = gadget_dev_to_dummy(dev); 939 940 if (!dum->driver || !dum->driver->function) 941 return 0; 942 return scnprintf(buf, PAGE_SIZE, "%s\n", dum->driver->function); 943 } 944 static DEVICE_ATTR_RO(function); 945 946 /*-------------------------------------------------------------------------*/ 947 948 /* 949 * Driver registration/unregistration. 950 * 951 * This is basically hardware-specific; there's usually only one real USB 952 * device (not host) controller since that's how USB devices are intended 953 * to work. So most implementations of these api calls will rely on the 954 * fact that only one driver will ever bind to the hardware. But curious 955 * hardware can be built with discrete components, so the gadget API doesn't 956 * require that assumption. 957 * 958 * For this emulator, it might be convenient to create a usb slave device 959 * for each driver that registers: just add to a big root hub. 960 */ 961 962 static int dummy_udc_start(struct usb_gadget *g, 963 struct usb_gadget_driver *driver) 964 { 965 struct dummy_hcd *dum_hcd = gadget_to_dummy_hcd(g); 966 struct dummy *dum = dum_hcd->dum; 967 968 switch (g->speed) { 969 /* All the speeds we support */ 970 case USB_SPEED_LOW: 971 case USB_SPEED_FULL: 972 case USB_SPEED_HIGH: 973 case USB_SPEED_SUPER: 974 break; 975 default: 976 dev_err(dummy_dev(dum_hcd), "Unsupported driver max speed %d\n", 977 driver->max_speed); 978 return -EINVAL; 979 } 980 981 /* 982 * SLAVE side init ... the layer above hardware, which 983 * can't enumerate without help from the driver we're binding. 984 */ 985 986 spin_lock_irq(&dum->lock); 987 dum->devstatus = 0; 988 dum->driver = driver; 989 dum->ints_enabled = 1; 990 spin_unlock_irq(&dum->lock); 991 992 return 0; 993 } 994 995 static int dummy_udc_stop(struct usb_gadget *g) 996 { 997 struct dummy_hcd *dum_hcd = gadget_to_dummy_hcd(g); 998 struct dummy *dum = dum_hcd->dum; 999 1000 spin_lock_irq(&dum->lock); 1001 dum->ints_enabled = 0; 1002 stop_activity(dum); 1003 1004 /* emulate synchronize_irq(): wait for callbacks to finish */ 1005 while (dum->callback_usage > 0) { 1006 spin_unlock_irq(&dum->lock); 1007 usleep_range(1000, 2000); 1008 spin_lock_irq(&dum->lock); 1009 } 1010 1011 dum->driver = NULL; 1012 spin_unlock_irq(&dum->lock); 1013 1014 return 0; 1015 } 1016 1017 #undef is_enabled 1018 1019 /* The gadget structure is stored inside the hcd structure and will be 1020 * released along with it. */ 1021 static void init_dummy_udc_hw(struct dummy *dum) 1022 { 1023 int i; 1024 1025 INIT_LIST_HEAD(&dum->gadget.ep_list); 1026 for (i = 0; i < DUMMY_ENDPOINTS; i++) { 1027 struct dummy_ep *ep = &dum->ep[i]; 1028 1029 if (!ep_info[i].name) 1030 break; 1031 ep->ep.name = ep_info[i].name; 1032 ep->ep.caps = ep_info[i].caps; 1033 ep->ep.ops = &dummy_ep_ops; 1034 list_add_tail(&ep->ep.ep_list, &dum->gadget.ep_list); 1035 ep->halted = ep->wedged = ep->already_seen = 1036 ep->setup_stage = 0; 1037 usb_ep_set_maxpacket_limit(&ep->ep, ~0); 1038 ep->ep.max_streams = 16; 1039 ep->last_io = jiffies; 1040 ep->gadget = &dum->gadget; 1041 ep->desc = NULL; 1042 INIT_LIST_HEAD(&ep->queue); 1043 } 1044 1045 dum->gadget.ep0 = &dum->ep[0].ep; 1046 list_del_init(&dum->ep[0].ep.ep_list); 1047 INIT_LIST_HEAD(&dum->fifo_req.queue); 1048 1049 #ifdef CONFIG_USB_OTG 1050 dum->gadget.is_otg = 1; 1051 #endif 1052 } 1053 1054 static int dummy_udc_probe(struct platform_device *pdev) 1055 { 1056 struct dummy *dum; 1057 int rc; 1058 1059 dum = *((void **)dev_get_platdata(&pdev->dev)); 1060 /* Clear usb_gadget region for new registration to udc-core */ 1061 memzero_explicit(&dum->gadget, sizeof(struct usb_gadget)); 1062 dum->gadget.name = gadget_name; 1063 dum->gadget.ops = &dummy_ops; 1064 if (mod_data.is_super_speed) 1065 dum->gadget.max_speed = USB_SPEED_SUPER; 1066 else if (mod_data.is_high_speed) 1067 dum->gadget.max_speed = USB_SPEED_HIGH; 1068 else 1069 dum->gadget.max_speed = USB_SPEED_FULL; 1070 1071 dum->gadget.dev.parent = &pdev->dev; 1072 init_dummy_udc_hw(dum); 1073 1074 rc = usb_add_gadget_udc(&pdev->dev, &dum->gadget); 1075 if (rc < 0) 1076 goto err_udc; 1077 1078 rc = device_create_file(&dum->gadget.dev, &dev_attr_function); 1079 if (rc < 0) 1080 goto err_dev; 1081 platform_set_drvdata(pdev, dum); 1082 return rc; 1083 1084 err_dev: 1085 usb_del_gadget_udc(&dum->gadget); 1086 err_udc: 1087 return rc; 1088 } 1089 1090 static int dummy_udc_remove(struct platform_device *pdev) 1091 { 1092 struct dummy *dum = platform_get_drvdata(pdev); 1093 1094 device_remove_file(&dum->gadget.dev, &dev_attr_function); 1095 usb_del_gadget_udc(&dum->gadget); 1096 return 0; 1097 } 1098 1099 static void dummy_udc_pm(struct dummy *dum, struct dummy_hcd *dum_hcd, 1100 int suspend) 1101 { 1102 spin_lock_irq(&dum->lock); 1103 dum->udc_suspended = suspend; 1104 set_link_state(dum_hcd); 1105 spin_unlock_irq(&dum->lock); 1106 } 1107 1108 static int dummy_udc_suspend(struct platform_device *pdev, pm_message_t state) 1109 { 1110 struct dummy *dum = platform_get_drvdata(pdev); 1111 struct dummy_hcd *dum_hcd = gadget_to_dummy_hcd(&dum->gadget); 1112 1113 dev_dbg(&pdev->dev, "%s\n", __func__); 1114 dummy_udc_pm(dum, dum_hcd, 1); 1115 usb_hcd_poll_rh_status(dummy_hcd_to_hcd(dum_hcd)); 1116 return 0; 1117 } 1118 1119 static int dummy_udc_resume(struct platform_device *pdev) 1120 { 1121 struct dummy *dum = platform_get_drvdata(pdev); 1122 struct dummy_hcd *dum_hcd = gadget_to_dummy_hcd(&dum->gadget); 1123 1124 dev_dbg(&pdev->dev, "%s\n", __func__); 1125 dummy_udc_pm(dum, dum_hcd, 0); 1126 usb_hcd_poll_rh_status(dummy_hcd_to_hcd(dum_hcd)); 1127 return 0; 1128 } 1129 1130 static struct platform_driver dummy_udc_driver = { 1131 .probe = dummy_udc_probe, 1132 .remove = dummy_udc_remove, 1133 .suspend = dummy_udc_suspend, 1134 .resume = dummy_udc_resume, 1135 .driver = { 1136 .name = (char *) gadget_name, 1137 }, 1138 }; 1139 1140 /*-------------------------------------------------------------------------*/ 1141 1142 static unsigned int dummy_get_ep_idx(const struct usb_endpoint_descriptor *desc) 1143 { 1144 unsigned int index; 1145 1146 index = usb_endpoint_num(desc) << 1; 1147 if (usb_endpoint_dir_in(desc)) 1148 index |= 1; 1149 return index; 1150 } 1151 1152 /* MASTER/HOST SIDE DRIVER 1153 * 1154 * this uses the hcd framework to hook up to host side drivers. 1155 * its root hub will only have one device, otherwise it acts like 1156 * a normal host controller. 1157 * 1158 * when urbs are queued, they're just stuck on a list that we 1159 * scan in a timer callback. that callback connects writes from 1160 * the host with reads from the device, and so on, based on the 1161 * usb 2.0 rules. 1162 */ 1163 1164 static int dummy_ep_stream_en(struct dummy_hcd *dum_hcd, struct urb *urb) 1165 { 1166 const struct usb_endpoint_descriptor *desc = &urb->ep->desc; 1167 u32 index; 1168 1169 if (!usb_endpoint_xfer_bulk(desc)) 1170 return 0; 1171 1172 index = dummy_get_ep_idx(desc); 1173 return (1 << index) & dum_hcd->stream_en_ep; 1174 } 1175 1176 /* 1177 * The max stream number is saved as a nibble so for the 30 possible endpoints 1178 * we only 15 bytes of memory. Therefore we are limited to max 16 streams (0 1179 * means we use only 1 stream). The maximum according to the spec is 16bit so 1180 * if the 16 stream limit is about to go, the array size should be incremented 1181 * to 30 elements of type u16. 1182 */ 1183 static int get_max_streams_for_pipe(struct dummy_hcd *dum_hcd, 1184 unsigned int pipe) 1185 { 1186 int max_streams; 1187 1188 max_streams = dum_hcd->num_stream[usb_pipeendpoint(pipe)]; 1189 if (usb_pipeout(pipe)) 1190 max_streams >>= 4; 1191 else 1192 max_streams &= 0xf; 1193 max_streams++; 1194 return max_streams; 1195 } 1196 1197 static void set_max_streams_for_pipe(struct dummy_hcd *dum_hcd, 1198 unsigned int pipe, unsigned int streams) 1199 { 1200 int max_streams; 1201 1202 streams--; 1203 max_streams = dum_hcd->num_stream[usb_pipeendpoint(pipe)]; 1204 if (usb_pipeout(pipe)) { 1205 streams <<= 4; 1206 max_streams &= 0xf; 1207 } else { 1208 max_streams &= 0xf0; 1209 } 1210 max_streams |= streams; 1211 dum_hcd->num_stream[usb_pipeendpoint(pipe)] = max_streams; 1212 } 1213 1214 static int dummy_validate_stream(struct dummy_hcd *dum_hcd, struct urb *urb) 1215 { 1216 unsigned int max_streams; 1217 int enabled; 1218 1219 enabled = dummy_ep_stream_en(dum_hcd, urb); 1220 if (!urb->stream_id) { 1221 if (enabled) 1222 return -EINVAL; 1223 return 0; 1224 } 1225 if (!enabled) 1226 return -EINVAL; 1227 1228 max_streams = get_max_streams_for_pipe(dum_hcd, 1229 usb_pipeendpoint(urb->pipe)); 1230 if (urb->stream_id > max_streams) { 1231 dev_err(dummy_dev(dum_hcd), "Stream id %d is out of range.\n", 1232 urb->stream_id); 1233 BUG(); 1234 return -EINVAL; 1235 } 1236 return 0; 1237 } 1238 1239 static int dummy_urb_enqueue( 1240 struct usb_hcd *hcd, 1241 struct urb *urb, 1242 gfp_t mem_flags 1243 ) { 1244 struct dummy_hcd *dum_hcd; 1245 struct urbp *urbp; 1246 unsigned long flags; 1247 int rc; 1248 1249 urbp = kmalloc(sizeof *urbp, mem_flags); 1250 if (!urbp) 1251 return -ENOMEM; 1252 urbp->urb = urb; 1253 urbp->miter_started = 0; 1254 1255 dum_hcd = hcd_to_dummy_hcd(hcd); 1256 spin_lock_irqsave(&dum_hcd->dum->lock, flags); 1257 1258 rc = dummy_validate_stream(dum_hcd, urb); 1259 if (rc) { 1260 kfree(urbp); 1261 goto done; 1262 } 1263 1264 rc = usb_hcd_link_urb_to_ep(hcd, urb); 1265 if (rc) { 1266 kfree(urbp); 1267 goto done; 1268 } 1269 1270 if (!dum_hcd->udev) { 1271 dum_hcd->udev = urb->dev; 1272 usb_get_dev(dum_hcd->udev); 1273 } else if (unlikely(dum_hcd->udev != urb->dev)) 1274 dev_err(dummy_dev(dum_hcd), "usb_device address has changed!\n"); 1275 1276 list_add_tail(&urbp->urbp_list, &dum_hcd->urbp_list); 1277 urb->hcpriv = urbp; 1278 if (!dum_hcd->next_frame_urbp) 1279 dum_hcd->next_frame_urbp = urbp; 1280 if (usb_pipetype(urb->pipe) == PIPE_CONTROL) 1281 urb->error_count = 1; /* mark as a new urb */ 1282 1283 /* kick the scheduler, it'll do the rest */ 1284 if (!timer_pending(&dum_hcd->timer)) 1285 mod_timer(&dum_hcd->timer, jiffies + 1); 1286 1287 done: 1288 spin_unlock_irqrestore(&dum_hcd->dum->lock, flags); 1289 return rc; 1290 } 1291 1292 static int dummy_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status) 1293 { 1294 struct dummy_hcd *dum_hcd; 1295 unsigned long flags; 1296 int rc; 1297 1298 /* giveback happens automatically in timer callback, 1299 * so make sure the callback happens */ 1300 dum_hcd = hcd_to_dummy_hcd(hcd); 1301 spin_lock_irqsave(&dum_hcd->dum->lock, flags); 1302 1303 rc = usb_hcd_check_unlink_urb(hcd, urb, status); 1304 if (!rc && dum_hcd->rh_state != DUMMY_RH_RUNNING && 1305 !list_empty(&dum_hcd->urbp_list)) 1306 mod_timer(&dum_hcd->timer, jiffies); 1307 1308 spin_unlock_irqrestore(&dum_hcd->dum->lock, flags); 1309 return rc; 1310 } 1311 1312 static int dummy_perform_transfer(struct urb *urb, struct dummy_request *req, 1313 u32 len) 1314 { 1315 void *ubuf, *rbuf; 1316 struct urbp *urbp = urb->hcpriv; 1317 int to_host; 1318 struct sg_mapping_iter *miter = &urbp->miter; 1319 u32 trans = 0; 1320 u32 this_sg; 1321 bool next_sg; 1322 1323 to_host = usb_pipein(urb->pipe); 1324 rbuf = req->req.buf + req->req.actual; 1325 1326 if (!urb->num_sgs) { 1327 ubuf = urb->transfer_buffer + urb->actual_length; 1328 if (to_host) 1329 memcpy(ubuf, rbuf, len); 1330 else 1331 memcpy(rbuf, ubuf, len); 1332 return len; 1333 } 1334 1335 if (!urbp->miter_started) { 1336 u32 flags = SG_MITER_ATOMIC; 1337 1338 if (to_host) 1339 flags |= SG_MITER_TO_SG; 1340 else 1341 flags |= SG_MITER_FROM_SG; 1342 1343 sg_miter_start(miter, urb->sg, urb->num_sgs, flags); 1344 urbp->miter_started = 1; 1345 } 1346 next_sg = sg_miter_next(miter); 1347 if (next_sg == false) { 1348 WARN_ON_ONCE(1); 1349 return -EINVAL; 1350 } 1351 do { 1352 ubuf = miter->addr; 1353 this_sg = min_t(u32, len, miter->length); 1354 miter->consumed = this_sg; 1355 trans += this_sg; 1356 1357 if (to_host) 1358 memcpy(ubuf, rbuf, this_sg); 1359 else 1360 memcpy(rbuf, ubuf, this_sg); 1361 len -= this_sg; 1362 1363 if (!len) 1364 break; 1365 next_sg = sg_miter_next(miter); 1366 if (next_sg == false) { 1367 WARN_ON_ONCE(1); 1368 return -EINVAL; 1369 } 1370 1371 rbuf += this_sg; 1372 } while (1); 1373 1374 sg_miter_stop(miter); 1375 return trans; 1376 } 1377 1378 /* transfer up to a frame's worth; caller must own lock */ 1379 static int transfer(struct dummy_hcd *dum_hcd, struct urb *urb, 1380 struct dummy_ep *ep, int limit, int *status) 1381 { 1382 struct dummy *dum = dum_hcd->dum; 1383 struct dummy_request *req; 1384 int sent = 0; 1385 1386 top: 1387 /* if there's no request queued, the device is NAKing; return */ 1388 list_for_each_entry(req, &ep->queue, queue) { 1389 unsigned host_len, dev_len, len; 1390 int is_short, to_host; 1391 int rescan = 0; 1392 1393 if (dummy_ep_stream_en(dum_hcd, urb)) { 1394 if ((urb->stream_id != req->req.stream_id)) 1395 continue; 1396 } 1397 1398 /* 1..N packets of ep->ep.maxpacket each ... the last one 1399 * may be short (including zero length). 1400 * 1401 * writer can send a zlp explicitly (length 0) or implicitly 1402 * (length mod maxpacket zero, and 'zero' flag); they always 1403 * terminate reads. 1404 */ 1405 host_len = urb->transfer_buffer_length - urb->actual_length; 1406 dev_len = req->req.length - req->req.actual; 1407 len = min(host_len, dev_len); 1408 1409 /* FIXME update emulated data toggle too */ 1410 1411 to_host = usb_pipein(urb->pipe); 1412 if (unlikely(len == 0)) 1413 is_short = 1; 1414 else { 1415 /* not enough bandwidth left? */ 1416 if (limit < ep->ep.maxpacket && limit < len) 1417 break; 1418 len = min_t(unsigned, len, limit); 1419 if (len == 0) 1420 break; 1421 1422 /* send multiple of maxpacket first, then remainder */ 1423 if (len >= ep->ep.maxpacket) { 1424 is_short = 0; 1425 if (len % ep->ep.maxpacket) 1426 rescan = 1; 1427 len -= len % ep->ep.maxpacket; 1428 } else { 1429 is_short = 1; 1430 } 1431 1432 len = dummy_perform_transfer(urb, req, len); 1433 1434 ep->last_io = jiffies; 1435 if ((int)len < 0) { 1436 req->req.status = len; 1437 } else { 1438 limit -= len; 1439 sent += len; 1440 urb->actual_length += len; 1441 req->req.actual += len; 1442 } 1443 } 1444 1445 /* short packets terminate, maybe with overflow/underflow. 1446 * it's only really an error to write too much. 1447 * 1448 * partially filling a buffer optionally blocks queue advances 1449 * (so completion handlers can clean up the queue) but we don't 1450 * need to emulate such data-in-flight. 1451 */ 1452 if (is_short) { 1453 if (host_len == dev_len) { 1454 req->req.status = 0; 1455 *status = 0; 1456 } else if (to_host) { 1457 req->req.status = 0; 1458 if (dev_len > host_len) 1459 *status = -EOVERFLOW; 1460 else 1461 *status = 0; 1462 } else { 1463 *status = 0; 1464 if (host_len > dev_len) 1465 req->req.status = -EOVERFLOW; 1466 else 1467 req->req.status = 0; 1468 } 1469 1470 /* 1471 * many requests terminate without a short packet. 1472 * send a zlp if demanded by flags. 1473 */ 1474 } else { 1475 if (req->req.length == req->req.actual) { 1476 if (req->req.zero && to_host) 1477 rescan = 1; 1478 else 1479 req->req.status = 0; 1480 } 1481 if (urb->transfer_buffer_length == urb->actual_length) { 1482 if (urb->transfer_flags & URB_ZERO_PACKET && 1483 !to_host) 1484 rescan = 1; 1485 else 1486 *status = 0; 1487 } 1488 } 1489 1490 /* device side completion --> continuable */ 1491 if (req->req.status != -EINPROGRESS) { 1492 list_del_init(&req->queue); 1493 1494 spin_unlock(&dum->lock); 1495 usb_gadget_giveback_request(&ep->ep, &req->req); 1496 spin_lock(&dum->lock); 1497 1498 /* requests might have been unlinked... */ 1499 rescan = 1; 1500 } 1501 1502 /* host side completion --> terminate */ 1503 if (*status != -EINPROGRESS) 1504 break; 1505 1506 /* rescan to continue with any other queued i/o */ 1507 if (rescan) 1508 goto top; 1509 } 1510 return sent; 1511 } 1512 1513 static int periodic_bytes(struct dummy *dum, struct dummy_ep *ep) 1514 { 1515 int limit = ep->ep.maxpacket; 1516 1517 if (dum->gadget.speed == USB_SPEED_HIGH) { 1518 int tmp; 1519 1520 /* high bandwidth mode */ 1521 tmp = usb_endpoint_maxp_mult(ep->desc); 1522 tmp *= 8 /* applies to entire frame */; 1523 limit += limit * tmp; 1524 } 1525 if (dum->gadget.speed == USB_SPEED_SUPER) { 1526 switch (usb_endpoint_type(ep->desc)) { 1527 case USB_ENDPOINT_XFER_ISOC: 1528 /* Sec. 4.4.8.2 USB3.0 Spec */ 1529 limit = 3 * 16 * 1024 * 8; 1530 break; 1531 case USB_ENDPOINT_XFER_INT: 1532 /* Sec. 4.4.7.2 USB3.0 Spec */ 1533 limit = 3 * 1024 * 8; 1534 break; 1535 case USB_ENDPOINT_XFER_BULK: 1536 default: 1537 break; 1538 } 1539 } 1540 return limit; 1541 } 1542 1543 #define is_active(dum_hcd) ((dum_hcd->port_status & \ 1544 (USB_PORT_STAT_CONNECTION | USB_PORT_STAT_ENABLE | \ 1545 USB_PORT_STAT_SUSPEND)) \ 1546 == (USB_PORT_STAT_CONNECTION | USB_PORT_STAT_ENABLE)) 1547 1548 static struct dummy_ep *find_endpoint(struct dummy *dum, u8 address) 1549 { 1550 int i; 1551 1552 if (!is_active((dum->gadget.speed == USB_SPEED_SUPER ? 1553 dum->ss_hcd : dum->hs_hcd))) 1554 return NULL; 1555 if (!dum->ints_enabled) 1556 return NULL; 1557 if ((address & ~USB_DIR_IN) == 0) 1558 return &dum->ep[0]; 1559 for (i = 1; i < DUMMY_ENDPOINTS; i++) { 1560 struct dummy_ep *ep = &dum->ep[i]; 1561 1562 if (!ep->desc) 1563 continue; 1564 if (ep->desc->bEndpointAddress == address) 1565 return ep; 1566 } 1567 return NULL; 1568 } 1569 1570 #undef is_active 1571 1572 #define Dev_Request (USB_TYPE_STANDARD | USB_RECIP_DEVICE) 1573 #define Dev_InRequest (Dev_Request | USB_DIR_IN) 1574 #define Intf_Request (USB_TYPE_STANDARD | USB_RECIP_INTERFACE) 1575 #define Intf_InRequest (Intf_Request | USB_DIR_IN) 1576 #define Ep_Request (USB_TYPE_STANDARD | USB_RECIP_ENDPOINT) 1577 #define Ep_InRequest (Ep_Request | USB_DIR_IN) 1578 1579 1580 /** 1581 * handle_control_request() - handles all control transfers 1582 * @dum: pointer to dummy (the_controller) 1583 * @urb: the urb request to handle 1584 * @setup: pointer to the setup data for a USB device control 1585 * request 1586 * @status: pointer to request handling status 1587 * 1588 * Return 0 - if the request was handled 1589 * 1 - if the request wasn't handles 1590 * error code on error 1591 */ 1592 static int handle_control_request(struct dummy_hcd *dum_hcd, struct urb *urb, 1593 struct usb_ctrlrequest *setup, 1594 int *status) 1595 { 1596 struct dummy_ep *ep2; 1597 struct dummy *dum = dum_hcd->dum; 1598 int ret_val = 1; 1599 unsigned w_index; 1600 unsigned w_value; 1601 1602 w_index = le16_to_cpu(setup->wIndex); 1603 w_value = le16_to_cpu(setup->wValue); 1604 switch (setup->bRequest) { 1605 case USB_REQ_SET_ADDRESS: 1606 if (setup->bRequestType != Dev_Request) 1607 break; 1608 dum->address = w_value; 1609 *status = 0; 1610 dev_dbg(udc_dev(dum), "set_address = %d\n", 1611 w_value); 1612 ret_val = 0; 1613 break; 1614 case USB_REQ_SET_FEATURE: 1615 if (setup->bRequestType == Dev_Request) { 1616 ret_val = 0; 1617 switch (w_value) { 1618 case USB_DEVICE_REMOTE_WAKEUP: 1619 break; 1620 case USB_DEVICE_B_HNP_ENABLE: 1621 dum->gadget.b_hnp_enable = 1; 1622 break; 1623 case USB_DEVICE_A_HNP_SUPPORT: 1624 dum->gadget.a_hnp_support = 1; 1625 break; 1626 case USB_DEVICE_A_ALT_HNP_SUPPORT: 1627 dum->gadget.a_alt_hnp_support = 1; 1628 break; 1629 case USB_DEVICE_U1_ENABLE: 1630 if (dummy_hcd_to_hcd(dum_hcd)->speed == 1631 HCD_USB3) 1632 w_value = USB_DEV_STAT_U1_ENABLED; 1633 else 1634 ret_val = -EOPNOTSUPP; 1635 break; 1636 case USB_DEVICE_U2_ENABLE: 1637 if (dummy_hcd_to_hcd(dum_hcd)->speed == 1638 HCD_USB3) 1639 w_value = USB_DEV_STAT_U2_ENABLED; 1640 else 1641 ret_val = -EOPNOTSUPP; 1642 break; 1643 case USB_DEVICE_LTM_ENABLE: 1644 if (dummy_hcd_to_hcd(dum_hcd)->speed == 1645 HCD_USB3) 1646 w_value = USB_DEV_STAT_LTM_ENABLED; 1647 else 1648 ret_val = -EOPNOTSUPP; 1649 break; 1650 default: 1651 ret_val = -EOPNOTSUPP; 1652 } 1653 if (ret_val == 0) { 1654 dum->devstatus |= (1 << w_value); 1655 *status = 0; 1656 } 1657 } else if (setup->bRequestType == Ep_Request) { 1658 /* endpoint halt */ 1659 ep2 = find_endpoint(dum, w_index); 1660 if (!ep2 || ep2->ep.name == ep0name) { 1661 ret_val = -EOPNOTSUPP; 1662 break; 1663 } 1664 ep2->halted = 1; 1665 ret_val = 0; 1666 *status = 0; 1667 } 1668 break; 1669 case USB_REQ_CLEAR_FEATURE: 1670 if (setup->bRequestType == Dev_Request) { 1671 ret_val = 0; 1672 switch (w_value) { 1673 case USB_DEVICE_REMOTE_WAKEUP: 1674 w_value = USB_DEVICE_REMOTE_WAKEUP; 1675 break; 1676 case USB_DEVICE_U1_ENABLE: 1677 if (dummy_hcd_to_hcd(dum_hcd)->speed == 1678 HCD_USB3) 1679 w_value = USB_DEV_STAT_U1_ENABLED; 1680 else 1681 ret_val = -EOPNOTSUPP; 1682 break; 1683 case USB_DEVICE_U2_ENABLE: 1684 if (dummy_hcd_to_hcd(dum_hcd)->speed == 1685 HCD_USB3) 1686 w_value = USB_DEV_STAT_U2_ENABLED; 1687 else 1688 ret_val = -EOPNOTSUPP; 1689 break; 1690 case USB_DEVICE_LTM_ENABLE: 1691 if (dummy_hcd_to_hcd(dum_hcd)->speed == 1692 HCD_USB3) 1693 w_value = USB_DEV_STAT_LTM_ENABLED; 1694 else 1695 ret_val = -EOPNOTSUPP; 1696 break; 1697 default: 1698 ret_val = -EOPNOTSUPP; 1699 break; 1700 } 1701 if (ret_val == 0) { 1702 dum->devstatus &= ~(1 << w_value); 1703 *status = 0; 1704 } 1705 } else if (setup->bRequestType == Ep_Request) { 1706 /* endpoint halt */ 1707 ep2 = find_endpoint(dum, w_index); 1708 if (!ep2) { 1709 ret_val = -EOPNOTSUPP; 1710 break; 1711 } 1712 if (!ep2->wedged) 1713 ep2->halted = 0; 1714 ret_val = 0; 1715 *status = 0; 1716 } 1717 break; 1718 case USB_REQ_GET_STATUS: 1719 if (setup->bRequestType == Dev_InRequest 1720 || setup->bRequestType == Intf_InRequest 1721 || setup->bRequestType == Ep_InRequest) { 1722 char *buf; 1723 /* 1724 * device: remote wakeup, selfpowered 1725 * interface: nothing 1726 * endpoint: halt 1727 */ 1728 buf = (char *)urb->transfer_buffer; 1729 if (urb->transfer_buffer_length > 0) { 1730 if (setup->bRequestType == Ep_InRequest) { 1731 ep2 = find_endpoint(dum, w_index); 1732 if (!ep2) { 1733 ret_val = -EOPNOTSUPP; 1734 break; 1735 } 1736 buf[0] = ep2->halted; 1737 } else if (setup->bRequestType == 1738 Dev_InRequest) { 1739 buf[0] = (u8)dum->devstatus; 1740 } else 1741 buf[0] = 0; 1742 } 1743 if (urb->transfer_buffer_length > 1) 1744 buf[1] = 0; 1745 urb->actual_length = min_t(u32, 2, 1746 urb->transfer_buffer_length); 1747 ret_val = 0; 1748 *status = 0; 1749 } 1750 break; 1751 } 1752 return ret_val; 1753 } 1754 1755 /* drive both sides of the transfers; looks like irq handlers to 1756 * both drivers except the callbacks aren't in_irq(). 1757 */ 1758 static void dummy_timer(struct timer_list *t) 1759 { 1760 struct dummy_hcd *dum_hcd = from_timer(dum_hcd, t, timer); 1761 struct dummy *dum = dum_hcd->dum; 1762 struct urbp *urbp, *tmp; 1763 unsigned long flags; 1764 int limit, total; 1765 int i; 1766 1767 /* simplistic model for one frame's bandwidth */ 1768 /* FIXME: account for transaction and packet overhead */ 1769 switch (dum->gadget.speed) { 1770 case USB_SPEED_LOW: 1771 total = 8/*bytes*/ * 12/*packets*/; 1772 break; 1773 case USB_SPEED_FULL: 1774 total = 64/*bytes*/ * 19/*packets*/; 1775 break; 1776 case USB_SPEED_HIGH: 1777 total = 512/*bytes*/ * 13/*packets*/ * 8/*uframes*/; 1778 break; 1779 case USB_SPEED_SUPER: 1780 /* Bus speed is 500000 bytes/ms, so use a little less */ 1781 total = 490000; 1782 break; 1783 default: /* Can't happen */ 1784 dev_err(dummy_dev(dum_hcd), "bogus device speed\n"); 1785 total = 0; 1786 break; 1787 } 1788 1789 /* FIXME if HZ != 1000 this will probably misbehave ... */ 1790 1791 /* look at each urb queued by the host side driver */ 1792 spin_lock_irqsave(&dum->lock, flags); 1793 1794 if (!dum_hcd->udev) { 1795 dev_err(dummy_dev(dum_hcd), 1796 "timer fired with no URBs pending?\n"); 1797 spin_unlock_irqrestore(&dum->lock, flags); 1798 return; 1799 } 1800 dum_hcd->next_frame_urbp = NULL; 1801 1802 for (i = 0; i < DUMMY_ENDPOINTS; i++) { 1803 if (!ep_info[i].name) 1804 break; 1805 dum->ep[i].already_seen = 0; 1806 } 1807 1808 restart: 1809 list_for_each_entry_safe(urbp, tmp, &dum_hcd->urbp_list, urbp_list) { 1810 struct urb *urb; 1811 struct dummy_request *req; 1812 u8 address; 1813 struct dummy_ep *ep = NULL; 1814 int status = -EINPROGRESS; 1815 1816 /* stop when we reach URBs queued after the timer interrupt */ 1817 if (urbp == dum_hcd->next_frame_urbp) 1818 break; 1819 1820 urb = urbp->urb; 1821 if (urb->unlinked) 1822 goto return_urb; 1823 else if (dum_hcd->rh_state != DUMMY_RH_RUNNING) 1824 continue; 1825 1826 /* Used up this frame's bandwidth? */ 1827 if (total <= 0) 1828 continue; 1829 1830 /* find the gadget's ep for this request (if configured) */ 1831 address = usb_pipeendpoint (urb->pipe); 1832 if (usb_pipein(urb->pipe)) 1833 address |= USB_DIR_IN; 1834 ep = find_endpoint(dum, address); 1835 if (!ep) { 1836 /* set_configuration() disagreement */ 1837 dev_dbg(dummy_dev(dum_hcd), 1838 "no ep configured for urb %p\n", 1839 urb); 1840 status = -EPROTO; 1841 goto return_urb; 1842 } 1843 1844 if (ep->already_seen) 1845 continue; 1846 ep->already_seen = 1; 1847 if (ep == &dum->ep[0] && urb->error_count) { 1848 ep->setup_stage = 1; /* a new urb */ 1849 urb->error_count = 0; 1850 } 1851 if (ep->halted && !ep->setup_stage) { 1852 /* NOTE: must not be iso! */ 1853 dev_dbg(dummy_dev(dum_hcd), "ep %s halted, urb %p\n", 1854 ep->ep.name, urb); 1855 status = -EPIPE; 1856 goto return_urb; 1857 } 1858 /* FIXME make sure both ends agree on maxpacket */ 1859 1860 /* handle control requests */ 1861 if (ep == &dum->ep[0] && ep->setup_stage) { 1862 struct usb_ctrlrequest setup; 1863 int value = 1; 1864 1865 setup = *(struct usb_ctrlrequest *) urb->setup_packet; 1866 /* paranoia, in case of stale queued data */ 1867 list_for_each_entry(req, &ep->queue, queue) { 1868 list_del_init(&req->queue); 1869 req->req.status = -EOVERFLOW; 1870 dev_dbg(udc_dev(dum), "stale req = %p\n", 1871 req); 1872 1873 spin_unlock(&dum->lock); 1874 usb_gadget_giveback_request(&ep->ep, &req->req); 1875 spin_lock(&dum->lock); 1876 ep->already_seen = 0; 1877 goto restart; 1878 } 1879 1880 /* gadget driver never sees set_address or operations 1881 * on standard feature flags. some hardware doesn't 1882 * even expose them. 1883 */ 1884 ep->last_io = jiffies; 1885 ep->setup_stage = 0; 1886 ep->halted = 0; 1887 1888 value = handle_control_request(dum_hcd, urb, &setup, 1889 &status); 1890 1891 /* gadget driver handles all other requests. block 1892 * until setup() returns; no reentrancy issues etc. 1893 */ 1894 if (value > 0) { 1895 ++dum->callback_usage; 1896 spin_unlock(&dum->lock); 1897 value = dum->driver->setup(&dum->gadget, 1898 &setup); 1899 spin_lock(&dum->lock); 1900 --dum->callback_usage; 1901 1902 if (value >= 0) { 1903 /* no delays (max 64KB data stage) */ 1904 limit = 64*1024; 1905 goto treat_control_like_bulk; 1906 } 1907 /* error, see below */ 1908 } 1909 1910 if (value < 0) { 1911 if (value != -EOPNOTSUPP) 1912 dev_dbg(udc_dev(dum), 1913 "setup --> %d\n", 1914 value); 1915 status = -EPIPE; 1916 urb->actual_length = 0; 1917 } 1918 1919 goto return_urb; 1920 } 1921 1922 /* non-control requests */ 1923 limit = total; 1924 switch (usb_pipetype(urb->pipe)) { 1925 case PIPE_ISOCHRONOUS: 1926 /* 1927 * We don't support isochronous. But if we did, 1928 * here are some of the issues we'd have to face: 1929 * 1930 * Is it urb->interval since the last xfer? 1931 * Use urb->iso_frame_desc[i]. 1932 * Complete whether or not ep has requests queued. 1933 * Report random errors, to debug drivers. 1934 */ 1935 limit = max(limit, periodic_bytes(dum, ep)); 1936 status = -EINVAL; /* fail all xfers */ 1937 break; 1938 1939 case PIPE_INTERRUPT: 1940 /* FIXME is it urb->interval since the last xfer? 1941 * this almost certainly polls too fast. 1942 */ 1943 limit = max(limit, periodic_bytes(dum, ep)); 1944 /* FALLTHROUGH */ 1945 1946 default: 1947 treat_control_like_bulk: 1948 ep->last_io = jiffies; 1949 total -= transfer(dum_hcd, urb, ep, limit, &status); 1950 break; 1951 } 1952 1953 /* incomplete transfer? */ 1954 if (status == -EINPROGRESS) 1955 continue; 1956 1957 return_urb: 1958 list_del(&urbp->urbp_list); 1959 kfree(urbp); 1960 if (ep) 1961 ep->already_seen = ep->setup_stage = 0; 1962 1963 usb_hcd_unlink_urb_from_ep(dummy_hcd_to_hcd(dum_hcd), urb); 1964 spin_unlock(&dum->lock); 1965 usb_hcd_giveback_urb(dummy_hcd_to_hcd(dum_hcd), urb, status); 1966 spin_lock(&dum->lock); 1967 1968 goto restart; 1969 } 1970 1971 if (list_empty(&dum_hcd->urbp_list)) { 1972 usb_put_dev(dum_hcd->udev); 1973 dum_hcd->udev = NULL; 1974 } else if (dum_hcd->rh_state == DUMMY_RH_RUNNING) { 1975 /* want a 1 msec delay here */ 1976 mod_timer(&dum_hcd->timer, jiffies + msecs_to_jiffies(1)); 1977 } 1978 1979 spin_unlock_irqrestore(&dum->lock, flags); 1980 } 1981 1982 /*-------------------------------------------------------------------------*/ 1983 1984 #define PORT_C_MASK \ 1985 ((USB_PORT_STAT_C_CONNECTION \ 1986 | USB_PORT_STAT_C_ENABLE \ 1987 | USB_PORT_STAT_C_SUSPEND \ 1988 | USB_PORT_STAT_C_OVERCURRENT \ 1989 | USB_PORT_STAT_C_RESET) << 16) 1990 1991 static int dummy_hub_status(struct usb_hcd *hcd, char *buf) 1992 { 1993 struct dummy_hcd *dum_hcd; 1994 unsigned long flags; 1995 int retval = 0; 1996 1997 dum_hcd = hcd_to_dummy_hcd(hcd); 1998 1999 spin_lock_irqsave(&dum_hcd->dum->lock, flags); 2000 if (!HCD_HW_ACCESSIBLE(hcd)) 2001 goto done; 2002 2003 if (dum_hcd->resuming && time_after_eq(jiffies, dum_hcd->re_timeout)) { 2004 dum_hcd->port_status |= (USB_PORT_STAT_C_SUSPEND << 16); 2005 dum_hcd->port_status &= ~USB_PORT_STAT_SUSPEND; 2006 set_link_state(dum_hcd); 2007 } 2008 2009 if ((dum_hcd->port_status & PORT_C_MASK) != 0) { 2010 *buf = (1 << 1); 2011 dev_dbg(dummy_dev(dum_hcd), "port status 0x%08x has changes\n", 2012 dum_hcd->port_status); 2013 retval = 1; 2014 if (dum_hcd->rh_state == DUMMY_RH_SUSPENDED) 2015 usb_hcd_resume_root_hub(hcd); 2016 } 2017 done: 2018 spin_unlock_irqrestore(&dum_hcd->dum->lock, flags); 2019 return retval; 2020 } 2021 2022 /* usb 3.0 root hub device descriptor */ 2023 static struct { 2024 struct usb_bos_descriptor bos; 2025 struct usb_ss_cap_descriptor ss_cap; 2026 } __packed usb3_bos_desc = { 2027 2028 .bos = { 2029 .bLength = USB_DT_BOS_SIZE, 2030 .bDescriptorType = USB_DT_BOS, 2031 .wTotalLength = cpu_to_le16(sizeof(usb3_bos_desc)), 2032 .bNumDeviceCaps = 1, 2033 }, 2034 .ss_cap = { 2035 .bLength = USB_DT_USB_SS_CAP_SIZE, 2036 .bDescriptorType = USB_DT_DEVICE_CAPABILITY, 2037 .bDevCapabilityType = USB_SS_CAP_TYPE, 2038 .wSpeedSupported = cpu_to_le16(USB_5GBPS_OPERATION), 2039 .bFunctionalitySupport = ilog2(USB_5GBPS_OPERATION), 2040 }, 2041 }; 2042 2043 static inline void 2044 ss_hub_descriptor(struct usb_hub_descriptor *desc) 2045 { 2046 memset(desc, 0, sizeof *desc); 2047 desc->bDescriptorType = USB_DT_SS_HUB; 2048 desc->bDescLength = 12; 2049 desc->wHubCharacteristics = cpu_to_le16( 2050 HUB_CHAR_INDV_PORT_LPSM | 2051 HUB_CHAR_COMMON_OCPM); 2052 desc->bNbrPorts = 1; 2053 desc->u.ss.bHubHdrDecLat = 0x04; /* Worst case: 0.4 micro sec*/ 2054 desc->u.ss.DeviceRemovable = 0; 2055 } 2056 2057 static inline void hub_descriptor(struct usb_hub_descriptor *desc) 2058 { 2059 memset(desc, 0, sizeof *desc); 2060 desc->bDescriptorType = USB_DT_HUB; 2061 desc->bDescLength = 9; 2062 desc->wHubCharacteristics = cpu_to_le16( 2063 HUB_CHAR_INDV_PORT_LPSM | 2064 HUB_CHAR_COMMON_OCPM); 2065 desc->bNbrPorts = 1; 2066 desc->u.hs.DeviceRemovable[0] = 0; 2067 desc->u.hs.DeviceRemovable[1] = 0xff; /* PortPwrCtrlMask */ 2068 } 2069 2070 static int dummy_hub_control( 2071 struct usb_hcd *hcd, 2072 u16 typeReq, 2073 u16 wValue, 2074 u16 wIndex, 2075 char *buf, 2076 u16 wLength 2077 ) { 2078 struct dummy_hcd *dum_hcd; 2079 int retval = 0; 2080 unsigned long flags; 2081 2082 if (!HCD_HW_ACCESSIBLE(hcd)) 2083 return -ETIMEDOUT; 2084 2085 dum_hcd = hcd_to_dummy_hcd(hcd); 2086 2087 spin_lock_irqsave(&dum_hcd->dum->lock, flags); 2088 switch (typeReq) { 2089 case ClearHubFeature: 2090 break; 2091 case ClearPortFeature: 2092 switch (wValue) { 2093 case USB_PORT_FEAT_SUSPEND: 2094 if (hcd->speed == HCD_USB3) { 2095 dev_dbg(dummy_dev(dum_hcd), 2096 "USB_PORT_FEAT_SUSPEND req not " 2097 "supported for USB 3.0 roothub\n"); 2098 goto error; 2099 } 2100 if (dum_hcd->port_status & USB_PORT_STAT_SUSPEND) { 2101 /* 20msec resume signaling */ 2102 dum_hcd->resuming = 1; 2103 dum_hcd->re_timeout = jiffies + 2104 msecs_to_jiffies(20); 2105 } 2106 break; 2107 case USB_PORT_FEAT_POWER: 2108 dev_dbg(dummy_dev(dum_hcd), "power-off\n"); 2109 if (hcd->speed == HCD_USB3) 2110 dum_hcd->port_status &= ~USB_SS_PORT_STAT_POWER; 2111 else 2112 dum_hcd->port_status &= ~USB_PORT_STAT_POWER; 2113 set_link_state(dum_hcd); 2114 break; 2115 default: 2116 dum_hcd->port_status &= ~(1 << wValue); 2117 set_link_state(dum_hcd); 2118 } 2119 break; 2120 case GetHubDescriptor: 2121 if (hcd->speed == HCD_USB3 && 2122 (wLength < USB_DT_SS_HUB_SIZE || 2123 wValue != (USB_DT_SS_HUB << 8))) { 2124 dev_dbg(dummy_dev(dum_hcd), 2125 "Wrong hub descriptor type for " 2126 "USB 3.0 roothub.\n"); 2127 goto error; 2128 } 2129 if (hcd->speed == HCD_USB3) 2130 ss_hub_descriptor((struct usb_hub_descriptor *) buf); 2131 else 2132 hub_descriptor((struct usb_hub_descriptor *) buf); 2133 break; 2134 2135 case DeviceRequest | USB_REQ_GET_DESCRIPTOR: 2136 if (hcd->speed != HCD_USB3) 2137 goto error; 2138 2139 if ((wValue >> 8) != USB_DT_BOS) 2140 goto error; 2141 2142 memcpy(buf, &usb3_bos_desc, sizeof(usb3_bos_desc)); 2143 retval = sizeof(usb3_bos_desc); 2144 break; 2145 2146 case GetHubStatus: 2147 *(__le32 *) buf = cpu_to_le32(0); 2148 break; 2149 case GetPortStatus: 2150 if (wIndex != 1) 2151 retval = -EPIPE; 2152 2153 /* whoever resets or resumes must GetPortStatus to 2154 * complete it!! 2155 */ 2156 if (dum_hcd->resuming && 2157 time_after_eq(jiffies, dum_hcd->re_timeout)) { 2158 dum_hcd->port_status |= (USB_PORT_STAT_C_SUSPEND << 16); 2159 dum_hcd->port_status &= ~USB_PORT_STAT_SUSPEND; 2160 } 2161 if ((dum_hcd->port_status & USB_PORT_STAT_RESET) != 0 && 2162 time_after_eq(jiffies, dum_hcd->re_timeout)) { 2163 dum_hcd->port_status |= (USB_PORT_STAT_C_RESET << 16); 2164 dum_hcd->port_status &= ~USB_PORT_STAT_RESET; 2165 if (dum_hcd->dum->pullup) { 2166 dum_hcd->port_status |= USB_PORT_STAT_ENABLE; 2167 2168 if (hcd->speed < HCD_USB3) { 2169 switch (dum_hcd->dum->gadget.speed) { 2170 case USB_SPEED_HIGH: 2171 dum_hcd->port_status |= 2172 USB_PORT_STAT_HIGH_SPEED; 2173 break; 2174 case USB_SPEED_LOW: 2175 dum_hcd->dum->gadget.ep0-> 2176 maxpacket = 8; 2177 dum_hcd->port_status |= 2178 USB_PORT_STAT_LOW_SPEED; 2179 break; 2180 default: 2181 break; 2182 } 2183 } 2184 } 2185 } 2186 set_link_state(dum_hcd); 2187 ((__le16 *) buf)[0] = cpu_to_le16(dum_hcd->port_status); 2188 ((__le16 *) buf)[1] = cpu_to_le16(dum_hcd->port_status >> 16); 2189 break; 2190 case SetHubFeature: 2191 retval = -EPIPE; 2192 break; 2193 case SetPortFeature: 2194 switch (wValue) { 2195 case USB_PORT_FEAT_LINK_STATE: 2196 if (hcd->speed != HCD_USB3) { 2197 dev_dbg(dummy_dev(dum_hcd), 2198 "USB_PORT_FEAT_LINK_STATE req not " 2199 "supported for USB 2.0 roothub\n"); 2200 goto error; 2201 } 2202 /* 2203 * Since this is dummy we don't have an actual link so 2204 * there is nothing to do for the SET_LINK_STATE cmd 2205 */ 2206 break; 2207 case USB_PORT_FEAT_U1_TIMEOUT: 2208 case USB_PORT_FEAT_U2_TIMEOUT: 2209 /* TODO: add suspend/resume support! */ 2210 if (hcd->speed != HCD_USB3) { 2211 dev_dbg(dummy_dev(dum_hcd), 2212 "USB_PORT_FEAT_U1/2_TIMEOUT req not " 2213 "supported for USB 2.0 roothub\n"); 2214 goto error; 2215 } 2216 break; 2217 case USB_PORT_FEAT_SUSPEND: 2218 /* Applicable only for USB2.0 hub */ 2219 if (hcd->speed == HCD_USB3) { 2220 dev_dbg(dummy_dev(dum_hcd), 2221 "USB_PORT_FEAT_SUSPEND req not " 2222 "supported for USB 3.0 roothub\n"); 2223 goto error; 2224 } 2225 if (dum_hcd->active) { 2226 dum_hcd->port_status |= USB_PORT_STAT_SUSPEND; 2227 2228 /* HNP would happen here; for now we 2229 * assume b_bus_req is always true. 2230 */ 2231 set_link_state(dum_hcd); 2232 if (((1 << USB_DEVICE_B_HNP_ENABLE) 2233 & dum_hcd->dum->devstatus) != 0) 2234 dev_dbg(dummy_dev(dum_hcd), 2235 "no HNP yet!\n"); 2236 } 2237 break; 2238 case USB_PORT_FEAT_POWER: 2239 if (hcd->speed == HCD_USB3) 2240 dum_hcd->port_status |= USB_SS_PORT_STAT_POWER; 2241 else 2242 dum_hcd->port_status |= USB_PORT_STAT_POWER; 2243 set_link_state(dum_hcd); 2244 break; 2245 case USB_PORT_FEAT_BH_PORT_RESET: 2246 /* Applicable only for USB3.0 hub */ 2247 if (hcd->speed != HCD_USB3) { 2248 dev_dbg(dummy_dev(dum_hcd), 2249 "USB_PORT_FEAT_BH_PORT_RESET req not " 2250 "supported for USB 2.0 roothub\n"); 2251 goto error; 2252 } 2253 /* FALLS THROUGH */ 2254 case USB_PORT_FEAT_RESET: 2255 /* if it's already enabled, disable */ 2256 if (hcd->speed == HCD_USB3) { 2257 dum_hcd->port_status = 0; 2258 dum_hcd->port_status = 2259 (USB_SS_PORT_STAT_POWER | 2260 USB_PORT_STAT_CONNECTION | 2261 USB_PORT_STAT_RESET); 2262 } else 2263 dum_hcd->port_status &= ~(USB_PORT_STAT_ENABLE 2264 | USB_PORT_STAT_LOW_SPEED 2265 | USB_PORT_STAT_HIGH_SPEED); 2266 /* 2267 * We want to reset device status. All but the 2268 * Self powered feature 2269 */ 2270 dum_hcd->dum->devstatus &= 2271 (1 << USB_DEVICE_SELF_POWERED); 2272 /* 2273 * FIXME USB3.0: what is the correct reset signaling 2274 * interval? Is it still 50msec as for HS? 2275 */ 2276 dum_hcd->re_timeout = jiffies + msecs_to_jiffies(50); 2277 /* FALLS THROUGH */ 2278 default: 2279 if (hcd->speed == HCD_USB3) { 2280 if ((dum_hcd->port_status & 2281 USB_SS_PORT_STAT_POWER) != 0) { 2282 dum_hcd->port_status |= (1 << wValue); 2283 } 2284 } else 2285 if ((dum_hcd->port_status & 2286 USB_PORT_STAT_POWER) != 0) { 2287 dum_hcd->port_status |= (1 << wValue); 2288 } 2289 set_link_state(dum_hcd); 2290 } 2291 break; 2292 case GetPortErrorCount: 2293 if (hcd->speed != HCD_USB3) { 2294 dev_dbg(dummy_dev(dum_hcd), 2295 "GetPortErrorCount req not " 2296 "supported for USB 2.0 roothub\n"); 2297 goto error; 2298 } 2299 /* We'll always return 0 since this is a dummy hub */ 2300 *(__le32 *) buf = cpu_to_le32(0); 2301 break; 2302 case SetHubDepth: 2303 if (hcd->speed != HCD_USB3) { 2304 dev_dbg(dummy_dev(dum_hcd), 2305 "SetHubDepth req not supported for " 2306 "USB 2.0 roothub\n"); 2307 goto error; 2308 } 2309 break; 2310 default: 2311 dev_dbg(dummy_dev(dum_hcd), 2312 "hub control req%04x v%04x i%04x l%d\n", 2313 typeReq, wValue, wIndex, wLength); 2314 error: 2315 /* "protocol stall" on error */ 2316 retval = -EPIPE; 2317 } 2318 spin_unlock_irqrestore(&dum_hcd->dum->lock, flags); 2319 2320 if ((dum_hcd->port_status & PORT_C_MASK) != 0) 2321 usb_hcd_poll_rh_status(hcd); 2322 return retval; 2323 } 2324 2325 static int dummy_bus_suspend(struct usb_hcd *hcd) 2326 { 2327 struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd); 2328 2329 dev_dbg(&hcd->self.root_hub->dev, "%s\n", __func__); 2330 2331 spin_lock_irq(&dum_hcd->dum->lock); 2332 dum_hcd->rh_state = DUMMY_RH_SUSPENDED; 2333 set_link_state(dum_hcd); 2334 hcd->state = HC_STATE_SUSPENDED; 2335 spin_unlock_irq(&dum_hcd->dum->lock); 2336 return 0; 2337 } 2338 2339 static int dummy_bus_resume(struct usb_hcd *hcd) 2340 { 2341 struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd); 2342 int rc = 0; 2343 2344 dev_dbg(&hcd->self.root_hub->dev, "%s\n", __func__); 2345 2346 spin_lock_irq(&dum_hcd->dum->lock); 2347 if (!HCD_HW_ACCESSIBLE(hcd)) { 2348 rc = -ESHUTDOWN; 2349 } else { 2350 dum_hcd->rh_state = DUMMY_RH_RUNNING; 2351 set_link_state(dum_hcd); 2352 if (!list_empty(&dum_hcd->urbp_list)) 2353 mod_timer(&dum_hcd->timer, jiffies); 2354 hcd->state = HC_STATE_RUNNING; 2355 } 2356 spin_unlock_irq(&dum_hcd->dum->lock); 2357 return rc; 2358 } 2359 2360 /*-------------------------------------------------------------------------*/ 2361 2362 static inline ssize_t show_urb(char *buf, size_t size, struct urb *urb) 2363 { 2364 int ep = usb_pipeendpoint(urb->pipe); 2365 2366 return scnprintf(buf, size, 2367 "urb/%p %s ep%d%s%s len %d/%d\n", 2368 urb, 2369 ({ char *s; 2370 switch (urb->dev->speed) { 2371 case USB_SPEED_LOW: 2372 s = "ls"; 2373 break; 2374 case USB_SPEED_FULL: 2375 s = "fs"; 2376 break; 2377 case USB_SPEED_HIGH: 2378 s = "hs"; 2379 break; 2380 case USB_SPEED_SUPER: 2381 s = "ss"; 2382 break; 2383 default: 2384 s = "?"; 2385 break; 2386 } s; }), 2387 ep, ep ? (usb_pipein(urb->pipe) ? "in" : "out") : "", 2388 ({ char *s; \ 2389 switch (usb_pipetype(urb->pipe)) { \ 2390 case PIPE_CONTROL: \ 2391 s = ""; \ 2392 break; \ 2393 case PIPE_BULK: \ 2394 s = "-bulk"; \ 2395 break; \ 2396 case PIPE_INTERRUPT: \ 2397 s = "-int"; \ 2398 break; \ 2399 default: \ 2400 s = "-iso"; \ 2401 break; \ 2402 } s; }), 2403 urb->actual_length, urb->transfer_buffer_length); 2404 } 2405 2406 static ssize_t urbs_show(struct device *dev, struct device_attribute *attr, 2407 char *buf) 2408 { 2409 struct usb_hcd *hcd = dev_get_drvdata(dev); 2410 struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd); 2411 struct urbp *urbp; 2412 size_t size = 0; 2413 unsigned long flags; 2414 2415 spin_lock_irqsave(&dum_hcd->dum->lock, flags); 2416 list_for_each_entry(urbp, &dum_hcd->urbp_list, urbp_list) { 2417 size_t temp; 2418 2419 temp = show_urb(buf, PAGE_SIZE - size, urbp->urb); 2420 buf += temp; 2421 size += temp; 2422 } 2423 spin_unlock_irqrestore(&dum_hcd->dum->lock, flags); 2424 2425 return size; 2426 } 2427 static DEVICE_ATTR_RO(urbs); 2428 2429 static int dummy_start_ss(struct dummy_hcd *dum_hcd) 2430 { 2431 timer_setup(&dum_hcd->timer, dummy_timer, 0); 2432 dum_hcd->rh_state = DUMMY_RH_RUNNING; 2433 dum_hcd->stream_en_ep = 0; 2434 INIT_LIST_HEAD(&dum_hcd->urbp_list); 2435 dummy_hcd_to_hcd(dum_hcd)->power_budget = POWER_BUDGET; 2436 dummy_hcd_to_hcd(dum_hcd)->state = HC_STATE_RUNNING; 2437 dummy_hcd_to_hcd(dum_hcd)->uses_new_polling = 1; 2438 #ifdef CONFIG_USB_OTG 2439 dummy_hcd_to_hcd(dum_hcd)->self.otg_port = 1; 2440 #endif 2441 return 0; 2442 2443 /* FIXME 'urbs' should be a per-device thing, maybe in usbcore */ 2444 return device_create_file(dummy_dev(dum_hcd), &dev_attr_urbs); 2445 } 2446 2447 static int dummy_start(struct usb_hcd *hcd) 2448 { 2449 struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd); 2450 2451 /* 2452 * MASTER side init ... we emulate a root hub that'll only ever 2453 * talk to one device (the slave side). Also appears in sysfs, 2454 * just like more familiar pci-based HCDs. 2455 */ 2456 if (!usb_hcd_is_primary_hcd(hcd)) 2457 return dummy_start_ss(dum_hcd); 2458 2459 spin_lock_init(&dum_hcd->dum->lock); 2460 timer_setup(&dum_hcd->timer, dummy_timer, 0); 2461 dum_hcd->rh_state = DUMMY_RH_RUNNING; 2462 2463 INIT_LIST_HEAD(&dum_hcd->urbp_list); 2464 2465 hcd->power_budget = POWER_BUDGET; 2466 hcd->state = HC_STATE_RUNNING; 2467 hcd->uses_new_polling = 1; 2468 2469 #ifdef CONFIG_USB_OTG 2470 hcd->self.otg_port = 1; 2471 #endif 2472 2473 /* FIXME 'urbs' should be a per-device thing, maybe in usbcore */ 2474 return device_create_file(dummy_dev(dum_hcd), &dev_attr_urbs); 2475 } 2476 2477 static void dummy_stop(struct usb_hcd *hcd) 2478 { 2479 device_remove_file(dummy_dev(hcd_to_dummy_hcd(hcd)), &dev_attr_urbs); 2480 dev_info(dummy_dev(hcd_to_dummy_hcd(hcd)), "stopped\n"); 2481 } 2482 2483 /*-------------------------------------------------------------------------*/ 2484 2485 static int dummy_h_get_frame(struct usb_hcd *hcd) 2486 { 2487 return dummy_g_get_frame(NULL); 2488 } 2489 2490 static int dummy_setup(struct usb_hcd *hcd) 2491 { 2492 struct dummy *dum; 2493 2494 dum = *((void **)dev_get_platdata(hcd->self.controller)); 2495 hcd->self.sg_tablesize = ~0; 2496 if (usb_hcd_is_primary_hcd(hcd)) { 2497 dum->hs_hcd = hcd_to_dummy_hcd(hcd); 2498 dum->hs_hcd->dum = dum; 2499 /* 2500 * Mark the first roothub as being USB 2.0. 2501 * The USB 3.0 roothub will be registered later by 2502 * dummy_hcd_probe() 2503 */ 2504 hcd->speed = HCD_USB2; 2505 hcd->self.root_hub->speed = USB_SPEED_HIGH; 2506 } else { 2507 dum->ss_hcd = hcd_to_dummy_hcd(hcd); 2508 dum->ss_hcd->dum = dum; 2509 hcd->speed = HCD_USB3; 2510 hcd->self.root_hub->speed = USB_SPEED_SUPER; 2511 } 2512 return 0; 2513 } 2514 2515 /* Change a group of bulk endpoints to support multiple stream IDs */ 2516 static int dummy_alloc_streams(struct usb_hcd *hcd, struct usb_device *udev, 2517 struct usb_host_endpoint **eps, unsigned int num_eps, 2518 unsigned int num_streams, gfp_t mem_flags) 2519 { 2520 struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd); 2521 unsigned long flags; 2522 int max_stream; 2523 int ret_streams = num_streams; 2524 unsigned int index; 2525 unsigned int i; 2526 2527 if (!num_eps) 2528 return -EINVAL; 2529 2530 spin_lock_irqsave(&dum_hcd->dum->lock, flags); 2531 for (i = 0; i < num_eps; i++) { 2532 index = dummy_get_ep_idx(&eps[i]->desc); 2533 if ((1 << index) & dum_hcd->stream_en_ep) { 2534 ret_streams = -EINVAL; 2535 goto out; 2536 } 2537 max_stream = usb_ss_max_streams(&eps[i]->ss_ep_comp); 2538 if (!max_stream) { 2539 ret_streams = -EINVAL; 2540 goto out; 2541 } 2542 if (max_stream < ret_streams) { 2543 dev_dbg(dummy_dev(dum_hcd), "Ep 0x%x only supports %u " 2544 "stream IDs.\n", 2545 eps[i]->desc.bEndpointAddress, 2546 max_stream); 2547 ret_streams = max_stream; 2548 } 2549 } 2550 2551 for (i = 0; i < num_eps; i++) { 2552 index = dummy_get_ep_idx(&eps[i]->desc); 2553 dum_hcd->stream_en_ep |= 1 << index; 2554 set_max_streams_for_pipe(dum_hcd, 2555 usb_endpoint_num(&eps[i]->desc), ret_streams); 2556 } 2557 out: 2558 spin_unlock_irqrestore(&dum_hcd->dum->lock, flags); 2559 return ret_streams; 2560 } 2561 2562 /* Reverts a group of bulk endpoints back to not using stream IDs. */ 2563 static int dummy_free_streams(struct usb_hcd *hcd, struct usb_device *udev, 2564 struct usb_host_endpoint **eps, unsigned int num_eps, 2565 gfp_t mem_flags) 2566 { 2567 struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd); 2568 unsigned long flags; 2569 int ret; 2570 unsigned int index; 2571 unsigned int i; 2572 2573 spin_lock_irqsave(&dum_hcd->dum->lock, flags); 2574 for (i = 0; i < num_eps; i++) { 2575 index = dummy_get_ep_idx(&eps[i]->desc); 2576 if (!((1 << index) & dum_hcd->stream_en_ep)) { 2577 ret = -EINVAL; 2578 goto out; 2579 } 2580 } 2581 2582 for (i = 0; i < num_eps; i++) { 2583 index = dummy_get_ep_idx(&eps[i]->desc); 2584 dum_hcd->stream_en_ep &= ~(1 << index); 2585 set_max_streams_for_pipe(dum_hcd, 2586 usb_endpoint_num(&eps[i]->desc), 0); 2587 } 2588 ret = 0; 2589 out: 2590 spin_unlock_irqrestore(&dum_hcd->dum->lock, flags); 2591 return ret; 2592 } 2593 2594 static struct hc_driver dummy_hcd = { 2595 .description = (char *) driver_name, 2596 .product_desc = "Dummy host controller", 2597 .hcd_priv_size = sizeof(struct dummy_hcd), 2598 2599 .reset = dummy_setup, 2600 .start = dummy_start, 2601 .stop = dummy_stop, 2602 2603 .urb_enqueue = dummy_urb_enqueue, 2604 .urb_dequeue = dummy_urb_dequeue, 2605 2606 .get_frame_number = dummy_h_get_frame, 2607 2608 .hub_status_data = dummy_hub_status, 2609 .hub_control = dummy_hub_control, 2610 .bus_suspend = dummy_bus_suspend, 2611 .bus_resume = dummy_bus_resume, 2612 2613 .alloc_streams = dummy_alloc_streams, 2614 .free_streams = dummy_free_streams, 2615 }; 2616 2617 static int dummy_hcd_probe(struct platform_device *pdev) 2618 { 2619 struct dummy *dum; 2620 struct usb_hcd *hs_hcd; 2621 struct usb_hcd *ss_hcd; 2622 int retval; 2623 2624 dev_info(&pdev->dev, "%s, driver " DRIVER_VERSION "\n", driver_desc); 2625 dum = *((void **)dev_get_platdata(&pdev->dev)); 2626 2627 if (mod_data.is_super_speed) 2628 dummy_hcd.flags = HCD_USB3 | HCD_SHARED; 2629 else if (mod_data.is_high_speed) 2630 dummy_hcd.flags = HCD_USB2; 2631 else 2632 dummy_hcd.flags = HCD_USB11; 2633 hs_hcd = usb_create_hcd(&dummy_hcd, &pdev->dev, dev_name(&pdev->dev)); 2634 if (!hs_hcd) 2635 return -ENOMEM; 2636 hs_hcd->has_tt = 1; 2637 2638 retval = usb_add_hcd(hs_hcd, 0, 0); 2639 if (retval) 2640 goto put_usb2_hcd; 2641 2642 if (mod_data.is_super_speed) { 2643 ss_hcd = usb_create_shared_hcd(&dummy_hcd, &pdev->dev, 2644 dev_name(&pdev->dev), hs_hcd); 2645 if (!ss_hcd) { 2646 retval = -ENOMEM; 2647 goto dealloc_usb2_hcd; 2648 } 2649 2650 retval = usb_add_hcd(ss_hcd, 0, 0); 2651 if (retval) 2652 goto put_usb3_hcd; 2653 } 2654 return 0; 2655 2656 put_usb3_hcd: 2657 usb_put_hcd(ss_hcd); 2658 dealloc_usb2_hcd: 2659 usb_remove_hcd(hs_hcd); 2660 put_usb2_hcd: 2661 usb_put_hcd(hs_hcd); 2662 dum->hs_hcd = dum->ss_hcd = NULL; 2663 return retval; 2664 } 2665 2666 static int dummy_hcd_remove(struct platform_device *pdev) 2667 { 2668 struct dummy *dum; 2669 2670 dum = hcd_to_dummy_hcd(platform_get_drvdata(pdev))->dum; 2671 2672 if (dum->ss_hcd) { 2673 usb_remove_hcd(dummy_hcd_to_hcd(dum->ss_hcd)); 2674 usb_put_hcd(dummy_hcd_to_hcd(dum->ss_hcd)); 2675 } 2676 2677 usb_remove_hcd(dummy_hcd_to_hcd(dum->hs_hcd)); 2678 usb_put_hcd(dummy_hcd_to_hcd(dum->hs_hcd)); 2679 2680 dum->hs_hcd = NULL; 2681 dum->ss_hcd = NULL; 2682 2683 return 0; 2684 } 2685 2686 static int dummy_hcd_suspend(struct platform_device *pdev, pm_message_t state) 2687 { 2688 struct usb_hcd *hcd; 2689 struct dummy_hcd *dum_hcd; 2690 int rc = 0; 2691 2692 dev_dbg(&pdev->dev, "%s\n", __func__); 2693 2694 hcd = platform_get_drvdata(pdev); 2695 dum_hcd = hcd_to_dummy_hcd(hcd); 2696 if (dum_hcd->rh_state == DUMMY_RH_RUNNING) { 2697 dev_warn(&pdev->dev, "Root hub isn't suspended!\n"); 2698 rc = -EBUSY; 2699 } else 2700 clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags); 2701 return rc; 2702 } 2703 2704 static int dummy_hcd_resume(struct platform_device *pdev) 2705 { 2706 struct usb_hcd *hcd; 2707 2708 dev_dbg(&pdev->dev, "%s\n", __func__); 2709 2710 hcd = platform_get_drvdata(pdev); 2711 set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags); 2712 usb_hcd_poll_rh_status(hcd); 2713 return 0; 2714 } 2715 2716 static struct platform_driver dummy_hcd_driver = { 2717 .probe = dummy_hcd_probe, 2718 .remove = dummy_hcd_remove, 2719 .suspend = dummy_hcd_suspend, 2720 .resume = dummy_hcd_resume, 2721 .driver = { 2722 .name = (char *) driver_name, 2723 }, 2724 }; 2725 2726 /*-------------------------------------------------------------------------*/ 2727 #define MAX_NUM_UDC 2 2728 static struct platform_device *the_udc_pdev[MAX_NUM_UDC]; 2729 static struct platform_device *the_hcd_pdev[MAX_NUM_UDC]; 2730 2731 static int __init init(void) 2732 { 2733 int retval = -ENOMEM; 2734 int i; 2735 struct dummy *dum[MAX_NUM_UDC]; 2736 2737 if (usb_disabled()) 2738 return -ENODEV; 2739 2740 if (!mod_data.is_high_speed && mod_data.is_super_speed) 2741 return -EINVAL; 2742 2743 if (mod_data.num < 1 || mod_data.num > MAX_NUM_UDC) { 2744 pr_err("Number of emulated UDC must be in range of 1...%d\n", 2745 MAX_NUM_UDC); 2746 return -EINVAL; 2747 } 2748 2749 for (i = 0; i < mod_data.num; i++) { 2750 the_hcd_pdev[i] = platform_device_alloc(driver_name, i); 2751 if (!the_hcd_pdev[i]) { 2752 i--; 2753 while (i >= 0) 2754 platform_device_put(the_hcd_pdev[i--]); 2755 return retval; 2756 } 2757 } 2758 for (i = 0; i < mod_data.num; i++) { 2759 the_udc_pdev[i] = platform_device_alloc(gadget_name, i); 2760 if (!the_udc_pdev[i]) { 2761 i--; 2762 while (i >= 0) 2763 platform_device_put(the_udc_pdev[i--]); 2764 goto err_alloc_udc; 2765 } 2766 } 2767 for (i = 0; i < mod_data.num; i++) { 2768 dum[i] = kzalloc(sizeof(struct dummy), GFP_KERNEL); 2769 if (!dum[i]) { 2770 retval = -ENOMEM; 2771 goto err_add_pdata; 2772 } 2773 retval = platform_device_add_data(the_hcd_pdev[i], &dum[i], 2774 sizeof(void *)); 2775 if (retval) 2776 goto err_add_pdata; 2777 retval = platform_device_add_data(the_udc_pdev[i], &dum[i], 2778 sizeof(void *)); 2779 if (retval) 2780 goto err_add_pdata; 2781 } 2782 2783 retval = platform_driver_register(&dummy_hcd_driver); 2784 if (retval < 0) 2785 goto err_add_pdata; 2786 retval = platform_driver_register(&dummy_udc_driver); 2787 if (retval < 0) 2788 goto err_register_udc_driver; 2789 2790 for (i = 0; i < mod_data.num; i++) { 2791 retval = platform_device_add(the_hcd_pdev[i]); 2792 if (retval < 0) { 2793 i--; 2794 while (i >= 0) 2795 platform_device_del(the_hcd_pdev[i--]); 2796 goto err_add_hcd; 2797 } 2798 } 2799 for (i = 0; i < mod_data.num; i++) { 2800 if (!dum[i]->hs_hcd || 2801 (!dum[i]->ss_hcd && mod_data.is_super_speed)) { 2802 /* 2803 * The hcd was added successfully but its probe 2804 * function failed for some reason. 2805 */ 2806 retval = -EINVAL; 2807 goto err_add_udc; 2808 } 2809 } 2810 2811 for (i = 0; i < mod_data.num; i++) { 2812 retval = platform_device_add(the_udc_pdev[i]); 2813 if (retval < 0) { 2814 i--; 2815 while (i >= 0) 2816 platform_device_del(the_udc_pdev[i--]); 2817 goto err_add_udc; 2818 } 2819 } 2820 2821 for (i = 0; i < mod_data.num; i++) { 2822 if (!platform_get_drvdata(the_udc_pdev[i])) { 2823 /* 2824 * The udc was added successfully but its probe 2825 * function failed for some reason. 2826 */ 2827 retval = -EINVAL; 2828 goto err_probe_udc; 2829 } 2830 } 2831 return retval; 2832 2833 err_probe_udc: 2834 for (i = 0; i < mod_data.num; i++) 2835 platform_device_del(the_udc_pdev[i]); 2836 err_add_udc: 2837 for (i = 0; i < mod_data.num; i++) 2838 platform_device_del(the_hcd_pdev[i]); 2839 err_add_hcd: 2840 platform_driver_unregister(&dummy_udc_driver); 2841 err_register_udc_driver: 2842 platform_driver_unregister(&dummy_hcd_driver); 2843 err_add_pdata: 2844 for (i = 0; i < mod_data.num; i++) 2845 kfree(dum[i]); 2846 for (i = 0; i < mod_data.num; i++) 2847 platform_device_put(the_udc_pdev[i]); 2848 err_alloc_udc: 2849 for (i = 0; i < mod_data.num; i++) 2850 platform_device_put(the_hcd_pdev[i]); 2851 return retval; 2852 } 2853 module_init(init); 2854 2855 static void __exit cleanup(void) 2856 { 2857 int i; 2858 2859 for (i = 0; i < mod_data.num; i++) { 2860 struct dummy *dum; 2861 2862 dum = *((void **)dev_get_platdata(&the_udc_pdev[i]->dev)); 2863 2864 platform_device_unregister(the_udc_pdev[i]); 2865 platform_device_unregister(the_hcd_pdev[i]); 2866 kfree(dum); 2867 } 2868 platform_driver_unregister(&dummy_udc_driver); 2869 platform_driver_unregister(&dummy_hcd_driver); 2870 } 2871 module_exit(cleanup); 2872