1 /* 2 * dummy_hcd.c -- Dummy/Loopback USB host and device emulator driver. 3 * 4 * Maintainer: Alan Stern <stern@rowland.harvard.edu> 5 * 6 * Copyright (C) 2003 David Brownell 7 * Copyright (C) 2003-2005 Alan Stern 8 * 9 * This program is free software; you can redistribute it and/or modify 10 * it under the terms of the GNU General Public License as published by 11 * the Free Software Foundation; either version 2 of the License, or 12 * (at your option) any later version. 13 */ 14 15 16 /* 17 * This exposes a device side "USB gadget" API, driven by requests to a 18 * Linux-USB host controller driver. USB traffic is simulated; there's 19 * no need for USB hardware. Use this with two other drivers: 20 * 21 * - Gadget driver, responding to requests (slave); 22 * - Host-side device driver, as already familiar in Linux. 23 * 24 * Having this all in one kernel can help some stages of development, 25 * bypassing some hardware (and driver) issues. UML could help too. 26 */ 27 28 #include <linux/module.h> 29 #include <linux/kernel.h> 30 #include <linux/delay.h> 31 #include <linux/ioport.h> 32 #include <linux/slab.h> 33 #include <linux/errno.h> 34 #include <linux/init.h> 35 #include <linux/timer.h> 36 #include <linux/list.h> 37 #include <linux/interrupt.h> 38 #include <linux/platform_device.h> 39 #include <linux/usb.h> 40 #include <linux/usb/gadget.h> 41 #include <linux/usb/hcd.h> 42 #include <linux/scatterlist.h> 43 44 #include <asm/byteorder.h> 45 #include <linux/io.h> 46 #include <asm/irq.h> 47 #include <asm/unaligned.h> 48 49 #define DRIVER_DESC "USB Host+Gadget Emulator" 50 #define DRIVER_VERSION "02 May 2005" 51 52 #define POWER_BUDGET 500 /* in mA; use 8 for low-power port testing */ 53 54 static const char driver_name[] = "dummy_hcd"; 55 static const char driver_desc[] = "USB Host+Gadget Emulator"; 56 57 static const char gadget_name[] = "dummy_udc"; 58 59 MODULE_DESCRIPTION(DRIVER_DESC); 60 MODULE_AUTHOR("David Brownell"); 61 MODULE_LICENSE("GPL"); 62 63 struct dummy_hcd_module_parameters { 64 bool is_super_speed; 65 bool is_high_speed; 66 unsigned int num; 67 }; 68 69 static struct dummy_hcd_module_parameters mod_data = { 70 .is_super_speed = false, 71 .is_high_speed = true, 72 .num = 1, 73 }; 74 module_param_named(is_super_speed, mod_data.is_super_speed, bool, S_IRUGO); 75 MODULE_PARM_DESC(is_super_speed, "true to simulate SuperSpeed connection"); 76 module_param_named(is_high_speed, mod_data.is_high_speed, bool, S_IRUGO); 77 MODULE_PARM_DESC(is_high_speed, "true to simulate HighSpeed connection"); 78 module_param_named(num, mod_data.num, uint, S_IRUGO); 79 MODULE_PARM_DESC(num, "number of emulated controllers"); 80 /*-------------------------------------------------------------------------*/ 81 82 /* gadget side driver data structres */ 83 struct dummy_ep { 84 struct list_head queue; 85 unsigned long last_io; /* jiffies timestamp */ 86 struct usb_gadget *gadget; 87 const struct usb_endpoint_descriptor *desc; 88 struct usb_ep ep; 89 unsigned halted:1; 90 unsigned wedged:1; 91 unsigned already_seen:1; 92 unsigned setup_stage:1; 93 unsigned stream_en:1; 94 }; 95 96 struct dummy_request { 97 struct list_head queue; /* ep's requests */ 98 struct usb_request req; 99 }; 100 101 static inline struct dummy_ep *usb_ep_to_dummy_ep(struct usb_ep *_ep) 102 { 103 return container_of(_ep, struct dummy_ep, ep); 104 } 105 106 static inline struct dummy_request *usb_request_to_dummy_request 107 (struct usb_request *_req) 108 { 109 return container_of(_req, struct dummy_request, req); 110 } 111 112 /*-------------------------------------------------------------------------*/ 113 114 /* 115 * Every device has ep0 for control requests, plus up to 30 more endpoints, 116 * in one of two types: 117 * 118 * - Configurable: direction (in/out), type (bulk, iso, etc), and endpoint 119 * number can be changed. Names like "ep-a" are used for this type. 120 * 121 * - Fixed Function: in other cases. some characteristics may be mutable; 122 * that'd be hardware-specific. Names like "ep12out-bulk" are used. 123 * 124 * Gadget drivers are responsible for not setting up conflicting endpoint 125 * configurations, illegal or unsupported packet lengths, and so on. 126 */ 127 128 static const char ep0name[] = "ep0"; 129 130 static const struct { 131 const char *name; 132 const struct usb_ep_caps caps; 133 } ep_info[] = { 134 #define EP_INFO(_name, _caps) \ 135 { \ 136 .name = _name, \ 137 .caps = _caps, \ 138 } 139 140 /* everyone has ep0 */ 141 EP_INFO(ep0name, 142 USB_EP_CAPS(USB_EP_CAPS_TYPE_CONTROL, USB_EP_CAPS_DIR_ALL)), 143 /* act like a pxa250: fifteen fixed function endpoints */ 144 EP_INFO("ep1in-bulk", 145 USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, USB_EP_CAPS_DIR_IN)), 146 EP_INFO("ep2out-bulk", 147 USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, USB_EP_CAPS_DIR_OUT)), 148 EP_INFO("ep3in-iso", 149 USB_EP_CAPS(USB_EP_CAPS_TYPE_ISO, USB_EP_CAPS_DIR_IN)), 150 EP_INFO("ep4out-iso", 151 USB_EP_CAPS(USB_EP_CAPS_TYPE_ISO, USB_EP_CAPS_DIR_OUT)), 152 EP_INFO("ep5in-int", 153 USB_EP_CAPS(USB_EP_CAPS_TYPE_INT, USB_EP_CAPS_DIR_IN)), 154 EP_INFO("ep6in-bulk", 155 USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, USB_EP_CAPS_DIR_IN)), 156 EP_INFO("ep7out-bulk", 157 USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, USB_EP_CAPS_DIR_OUT)), 158 EP_INFO("ep8in-iso", 159 USB_EP_CAPS(USB_EP_CAPS_TYPE_ISO, USB_EP_CAPS_DIR_IN)), 160 EP_INFO("ep9out-iso", 161 USB_EP_CAPS(USB_EP_CAPS_TYPE_ISO, USB_EP_CAPS_DIR_OUT)), 162 EP_INFO("ep10in-int", 163 USB_EP_CAPS(USB_EP_CAPS_TYPE_INT, USB_EP_CAPS_DIR_IN)), 164 EP_INFO("ep11in-bulk", 165 USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, USB_EP_CAPS_DIR_IN)), 166 EP_INFO("ep12out-bulk", 167 USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, USB_EP_CAPS_DIR_OUT)), 168 EP_INFO("ep13in-iso", 169 USB_EP_CAPS(USB_EP_CAPS_TYPE_ISO, USB_EP_CAPS_DIR_IN)), 170 EP_INFO("ep14out-iso", 171 USB_EP_CAPS(USB_EP_CAPS_TYPE_ISO, USB_EP_CAPS_DIR_OUT)), 172 EP_INFO("ep15in-int", 173 USB_EP_CAPS(USB_EP_CAPS_TYPE_INT, USB_EP_CAPS_DIR_IN)), 174 /* or like sa1100: two fixed function endpoints */ 175 EP_INFO("ep1out-bulk", 176 USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, USB_EP_CAPS_DIR_OUT)), 177 EP_INFO("ep2in-bulk", 178 USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, USB_EP_CAPS_DIR_IN)), 179 /* and now some generic EPs so we have enough in multi config */ 180 EP_INFO("ep3out", 181 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_OUT)), 182 EP_INFO("ep4in", 183 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_IN)), 184 EP_INFO("ep5out", 185 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_OUT)), 186 EP_INFO("ep6out", 187 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_OUT)), 188 EP_INFO("ep7in", 189 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_IN)), 190 EP_INFO("ep8out", 191 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_OUT)), 192 EP_INFO("ep9in", 193 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_IN)), 194 EP_INFO("ep10out", 195 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_OUT)), 196 EP_INFO("ep11out", 197 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_OUT)), 198 EP_INFO("ep12in", 199 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_IN)), 200 EP_INFO("ep13out", 201 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_OUT)), 202 EP_INFO("ep14in", 203 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_IN)), 204 EP_INFO("ep15out", 205 USB_EP_CAPS(USB_EP_CAPS_TYPE_ALL, USB_EP_CAPS_DIR_OUT)), 206 207 #undef EP_INFO 208 }; 209 210 #define DUMMY_ENDPOINTS ARRAY_SIZE(ep_info) 211 212 /*-------------------------------------------------------------------------*/ 213 214 #define FIFO_SIZE 64 215 216 struct urbp { 217 struct urb *urb; 218 struct list_head urbp_list; 219 struct sg_mapping_iter miter; 220 u32 miter_started; 221 }; 222 223 224 enum dummy_rh_state { 225 DUMMY_RH_RESET, 226 DUMMY_RH_SUSPENDED, 227 DUMMY_RH_RUNNING 228 }; 229 230 struct dummy_hcd { 231 struct dummy *dum; 232 enum dummy_rh_state rh_state; 233 struct timer_list timer; 234 u32 port_status; 235 u32 old_status; 236 unsigned long re_timeout; 237 238 struct usb_device *udev; 239 struct list_head urbp_list; 240 u32 stream_en_ep; 241 u8 num_stream[30 / 2]; 242 243 unsigned active:1; 244 unsigned old_active:1; 245 unsigned resuming:1; 246 }; 247 248 struct dummy { 249 spinlock_t lock; 250 251 /* 252 * SLAVE/GADGET side support 253 */ 254 struct dummy_ep ep[DUMMY_ENDPOINTS]; 255 int address; 256 struct usb_gadget gadget; 257 struct usb_gadget_driver *driver; 258 struct dummy_request fifo_req; 259 u8 fifo_buf[FIFO_SIZE]; 260 u16 devstatus; 261 unsigned udc_suspended:1; 262 unsigned pullup:1; 263 264 /* 265 * MASTER/HOST side support 266 */ 267 struct dummy_hcd *hs_hcd; 268 struct dummy_hcd *ss_hcd; 269 }; 270 271 static inline struct dummy_hcd *hcd_to_dummy_hcd(struct usb_hcd *hcd) 272 { 273 return (struct dummy_hcd *) (hcd->hcd_priv); 274 } 275 276 static inline struct usb_hcd *dummy_hcd_to_hcd(struct dummy_hcd *dum) 277 { 278 return container_of((void *) dum, struct usb_hcd, hcd_priv); 279 } 280 281 static inline struct device *dummy_dev(struct dummy_hcd *dum) 282 { 283 return dummy_hcd_to_hcd(dum)->self.controller; 284 } 285 286 static inline struct device *udc_dev(struct dummy *dum) 287 { 288 return dum->gadget.dev.parent; 289 } 290 291 static inline struct dummy *ep_to_dummy(struct dummy_ep *ep) 292 { 293 return container_of(ep->gadget, struct dummy, gadget); 294 } 295 296 static inline struct dummy_hcd *gadget_to_dummy_hcd(struct usb_gadget *gadget) 297 { 298 struct dummy *dum = container_of(gadget, struct dummy, gadget); 299 if (dum->gadget.speed == USB_SPEED_SUPER) 300 return dum->ss_hcd; 301 else 302 return dum->hs_hcd; 303 } 304 305 static inline struct dummy *gadget_dev_to_dummy(struct device *dev) 306 { 307 return container_of(dev, struct dummy, gadget.dev); 308 } 309 310 /*-------------------------------------------------------------------------*/ 311 312 /* SLAVE/GADGET SIDE UTILITY ROUTINES */ 313 314 /* called with spinlock held */ 315 static void nuke(struct dummy *dum, struct dummy_ep *ep) 316 { 317 while (!list_empty(&ep->queue)) { 318 struct dummy_request *req; 319 320 req = list_entry(ep->queue.next, struct dummy_request, queue); 321 list_del_init(&req->queue); 322 req->req.status = -ESHUTDOWN; 323 324 spin_unlock(&dum->lock); 325 usb_gadget_giveback_request(&ep->ep, &req->req); 326 spin_lock(&dum->lock); 327 } 328 } 329 330 /* caller must hold lock */ 331 static void stop_activity(struct dummy *dum) 332 { 333 int i; 334 335 /* prevent any more requests */ 336 dum->address = 0; 337 338 /* The timer is left running so that outstanding URBs can fail */ 339 340 /* nuke any pending requests first, so driver i/o is quiesced */ 341 for (i = 0; i < DUMMY_ENDPOINTS; ++i) 342 nuke(dum, &dum->ep[i]); 343 344 /* driver now does any non-usb quiescing necessary */ 345 } 346 347 /** 348 * set_link_state_by_speed() - Sets the current state of the link according to 349 * the hcd speed 350 * @dum_hcd: pointer to the dummy_hcd structure to update the link state for 351 * 352 * This function updates the port_status according to the link state and the 353 * speed of the hcd. 354 */ 355 static void set_link_state_by_speed(struct dummy_hcd *dum_hcd) 356 { 357 struct dummy *dum = dum_hcd->dum; 358 359 if (dummy_hcd_to_hcd(dum_hcd)->speed == HCD_USB3) { 360 if ((dum_hcd->port_status & USB_SS_PORT_STAT_POWER) == 0) { 361 dum_hcd->port_status = 0; 362 } else if (!dum->pullup || dum->udc_suspended) { 363 /* UDC suspend must cause a disconnect */ 364 dum_hcd->port_status &= ~(USB_PORT_STAT_CONNECTION | 365 USB_PORT_STAT_ENABLE); 366 if ((dum_hcd->old_status & 367 USB_PORT_STAT_CONNECTION) != 0) 368 dum_hcd->port_status |= 369 (USB_PORT_STAT_C_CONNECTION << 16); 370 } else { 371 /* device is connected and not suspended */ 372 dum_hcd->port_status |= (USB_PORT_STAT_CONNECTION | 373 USB_PORT_STAT_SPEED_5GBPS) ; 374 if ((dum_hcd->old_status & 375 USB_PORT_STAT_CONNECTION) == 0) 376 dum_hcd->port_status |= 377 (USB_PORT_STAT_C_CONNECTION << 16); 378 if ((dum_hcd->port_status & 379 USB_PORT_STAT_ENABLE) == 1 && 380 (dum_hcd->port_status & 381 USB_SS_PORT_LS_U0) == 1 && 382 dum_hcd->rh_state != DUMMY_RH_SUSPENDED) 383 dum_hcd->active = 1; 384 } 385 } else { 386 if ((dum_hcd->port_status & USB_PORT_STAT_POWER) == 0) { 387 dum_hcd->port_status = 0; 388 } else if (!dum->pullup || dum->udc_suspended) { 389 /* UDC suspend must cause a disconnect */ 390 dum_hcd->port_status &= ~(USB_PORT_STAT_CONNECTION | 391 USB_PORT_STAT_ENABLE | 392 USB_PORT_STAT_LOW_SPEED | 393 USB_PORT_STAT_HIGH_SPEED | 394 USB_PORT_STAT_SUSPEND); 395 if ((dum_hcd->old_status & 396 USB_PORT_STAT_CONNECTION) != 0) 397 dum_hcd->port_status |= 398 (USB_PORT_STAT_C_CONNECTION << 16); 399 } else { 400 dum_hcd->port_status |= USB_PORT_STAT_CONNECTION; 401 if ((dum_hcd->old_status & 402 USB_PORT_STAT_CONNECTION) == 0) 403 dum_hcd->port_status |= 404 (USB_PORT_STAT_C_CONNECTION << 16); 405 if ((dum_hcd->port_status & USB_PORT_STAT_ENABLE) == 0) 406 dum_hcd->port_status &= ~USB_PORT_STAT_SUSPEND; 407 else if ((dum_hcd->port_status & 408 USB_PORT_STAT_SUSPEND) == 0 && 409 dum_hcd->rh_state != DUMMY_RH_SUSPENDED) 410 dum_hcd->active = 1; 411 } 412 } 413 } 414 415 /* caller must hold lock */ 416 static void set_link_state(struct dummy_hcd *dum_hcd) 417 { 418 struct dummy *dum = dum_hcd->dum; 419 420 dum_hcd->active = 0; 421 if (dum->pullup) 422 if ((dummy_hcd_to_hcd(dum_hcd)->speed == HCD_USB3 && 423 dum->gadget.speed != USB_SPEED_SUPER) || 424 (dummy_hcd_to_hcd(dum_hcd)->speed != HCD_USB3 && 425 dum->gadget.speed == USB_SPEED_SUPER)) 426 return; 427 428 set_link_state_by_speed(dum_hcd); 429 430 if ((dum_hcd->port_status & USB_PORT_STAT_ENABLE) == 0 || 431 dum_hcd->active) 432 dum_hcd->resuming = 0; 433 434 /* Currently !connected or in reset */ 435 if ((dum_hcd->port_status & USB_PORT_STAT_CONNECTION) == 0 || 436 (dum_hcd->port_status & USB_PORT_STAT_RESET) != 0) { 437 unsigned disconnect = USB_PORT_STAT_CONNECTION & 438 dum_hcd->old_status & (~dum_hcd->port_status); 439 unsigned reset = USB_PORT_STAT_RESET & 440 (~dum_hcd->old_status) & dum_hcd->port_status; 441 442 /* Report reset and disconnect events to the driver */ 443 if (dum->driver && (disconnect || reset)) { 444 stop_activity(dum); 445 if (reset) 446 usb_gadget_udc_reset(&dum->gadget, dum->driver); 447 else 448 dum->driver->disconnect(&dum->gadget); 449 } 450 } else if (dum_hcd->active != dum_hcd->old_active) { 451 if (dum_hcd->old_active && dum->driver->suspend) 452 dum->driver->suspend(&dum->gadget); 453 else if (!dum_hcd->old_active && dum->driver->resume) 454 dum->driver->resume(&dum->gadget); 455 } 456 457 dum_hcd->old_status = dum_hcd->port_status; 458 dum_hcd->old_active = dum_hcd->active; 459 } 460 461 /*-------------------------------------------------------------------------*/ 462 463 /* SLAVE/GADGET SIDE DRIVER 464 * 465 * This only tracks gadget state. All the work is done when the host 466 * side tries some (emulated) i/o operation. Real device controller 467 * drivers would do real i/o using dma, fifos, irqs, timers, etc. 468 */ 469 470 #define is_enabled(dum) \ 471 (dum->port_status & USB_PORT_STAT_ENABLE) 472 473 static int dummy_enable(struct usb_ep *_ep, 474 const struct usb_endpoint_descriptor *desc) 475 { 476 struct dummy *dum; 477 struct dummy_hcd *dum_hcd; 478 struct dummy_ep *ep; 479 unsigned max; 480 int retval; 481 482 ep = usb_ep_to_dummy_ep(_ep); 483 if (!_ep || !desc || ep->desc || _ep->name == ep0name 484 || desc->bDescriptorType != USB_DT_ENDPOINT) 485 return -EINVAL; 486 dum = ep_to_dummy(ep); 487 if (!dum->driver) 488 return -ESHUTDOWN; 489 490 dum_hcd = gadget_to_dummy_hcd(&dum->gadget); 491 if (!is_enabled(dum_hcd)) 492 return -ESHUTDOWN; 493 494 /* 495 * For HS/FS devices only bits 0..10 of the wMaxPacketSize represent the 496 * maximum packet size. 497 * For SS devices the wMaxPacketSize is limited by 1024. 498 */ 499 max = usb_endpoint_maxp(desc); 500 501 /* drivers must not request bad settings, since lower levels 502 * (hardware or its drivers) may not check. some endpoints 503 * can't do iso, many have maxpacket limitations, etc. 504 * 505 * since this "hardware" driver is here to help debugging, we 506 * have some extra sanity checks. (there could be more though, 507 * especially for "ep9out" style fixed function ones.) 508 */ 509 retval = -EINVAL; 510 switch (usb_endpoint_type(desc)) { 511 case USB_ENDPOINT_XFER_BULK: 512 if (strstr(ep->ep.name, "-iso") 513 || strstr(ep->ep.name, "-int")) { 514 goto done; 515 } 516 switch (dum->gadget.speed) { 517 case USB_SPEED_SUPER: 518 if (max == 1024) 519 break; 520 goto done; 521 case USB_SPEED_HIGH: 522 if (max == 512) 523 break; 524 goto done; 525 case USB_SPEED_FULL: 526 if (max == 8 || max == 16 || max == 32 || max == 64) 527 /* we'll fake any legal size */ 528 break; 529 /* save a return statement */ 530 default: 531 goto done; 532 } 533 break; 534 case USB_ENDPOINT_XFER_INT: 535 if (strstr(ep->ep.name, "-iso")) /* bulk is ok */ 536 goto done; 537 /* real hardware might not handle all packet sizes */ 538 switch (dum->gadget.speed) { 539 case USB_SPEED_SUPER: 540 case USB_SPEED_HIGH: 541 if (max <= 1024) 542 break; 543 /* save a return statement */ 544 case USB_SPEED_FULL: 545 if (max <= 64) 546 break; 547 /* save a return statement */ 548 default: 549 if (max <= 8) 550 break; 551 goto done; 552 } 553 break; 554 case USB_ENDPOINT_XFER_ISOC: 555 if (strstr(ep->ep.name, "-bulk") 556 || strstr(ep->ep.name, "-int")) 557 goto done; 558 /* real hardware might not handle all packet sizes */ 559 switch (dum->gadget.speed) { 560 case USB_SPEED_SUPER: 561 case USB_SPEED_HIGH: 562 if (max <= 1024) 563 break; 564 /* save a return statement */ 565 case USB_SPEED_FULL: 566 if (max <= 1023) 567 break; 568 /* save a return statement */ 569 default: 570 goto done; 571 } 572 break; 573 default: 574 /* few chips support control except on ep0 */ 575 goto done; 576 } 577 578 _ep->maxpacket = max; 579 if (usb_ss_max_streams(_ep->comp_desc)) { 580 if (!usb_endpoint_xfer_bulk(desc)) { 581 dev_err(udc_dev(dum), "Can't enable stream support on " 582 "non-bulk ep %s\n", _ep->name); 583 return -EINVAL; 584 } 585 ep->stream_en = 1; 586 } 587 ep->desc = desc; 588 589 dev_dbg(udc_dev(dum), "enabled %s (ep%d%s-%s) maxpacket %d stream %s\n", 590 _ep->name, 591 desc->bEndpointAddress & 0x0f, 592 (desc->bEndpointAddress & USB_DIR_IN) ? "in" : "out", 593 ({ char *val; 594 switch (usb_endpoint_type(desc)) { 595 case USB_ENDPOINT_XFER_BULK: 596 val = "bulk"; 597 break; 598 case USB_ENDPOINT_XFER_ISOC: 599 val = "iso"; 600 break; 601 case USB_ENDPOINT_XFER_INT: 602 val = "intr"; 603 break; 604 default: 605 val = "ctrl"; 606 break; 607 } val; }), 608 max, ep->stream_en ? "enabled" : "disabled"); 609 610 /* at this point real hardware should be NAKing transfers 611 * to that endpoint, until a buffer is queued to it. 612 */ 613 ep->halted = ep->wedged = 0; 614 retval = 0; 615 done: 616 return retval; 617 } 618 619 static int dummy_disable(struct usb_ep *_ep) 620 { 621 struct dummy_ep *ep; 622 struct dummy *dum; 623 unsigned long flags; 624 625 ep = usb_ep_to_dummy_ep(_ep); 626 if (!_ep || !ep->desc || _ep->name == ep0name) 627 return -EINVAL; 628 dum = ep_to_dummy(ep); 629 630 spin_lock_irqsave(&dum->lock, flags); 631 ep->desc = NULL; 632 ep->stream_en = 0; 633 nuke(dum, ep); 634 spin_unlock_irqrestore(&dum->lock, flags); 635 636 dev_dbg(udc_dev(dum), "disabled %s\n", _ep->name); 637 return 0; 638 } 639 640 static struct usb_request *dummy_alloc_request(struct usb_ep *_ep, 641 gfp_t mem_flags) 642 { 643 struct dummy_request *req; 644 645 if (!_ep) 646 return NULL; 647 648 req = kzalloc(sizeof(*req), mem_flags); 649 if (!req) 650 return NULL; 651 INIT_LIST_HEAD(&req->queue); 652 return &req->req; 653 } 654 655 static void dummy_free_request(struct usb_ep *_ep, struct usb_request *_req) 656 { 657 struct dummy_request *req; 658 659 if (!_ep || !_req) { 660 WARN_ON(1); 661 return; 662 } 663 664 req = usb_request_to_dummy_request(_req); 665 WARN_ON(!list_empty(&req->queue)); 666 kfree(req); 667 } 668 669 static void fifo_complete(struct usb_ep *ep, struct usb_request *req) 670 { 671 } 672 673 static int dummy_queue(struct usb_ep *_ep, struct usb_request *_req, 674 gfp_t mem_flags) 675 { 676 struct dummy_ep *ep; 677 struct dummy_request *req; 678 struct dummy *dum; 679 struct dummy_hcd *dum_hcd; 680 unsigned long flags; 681 682 req = usb_request_to_dummy_request(_req); 683 if (!_req || !list_empty(&req->queue) || !_req->complete) 684 return -EINVAL; 685 686 ep = usb_ep_to_dummy_ep(_ep); 687 if (!_ep || (!ep->desc && _ep->name != ep0name)) 688 return -EINVAL; 689 690 dum = ep_to_dummy(ep); 691 dum_hcd = gadget_to_dummy_hcd(&dum->gadget); 692 if (!dum->driver || !is_enabled(dum_hcd)) 693 return -ESHUTDOWN; 694 695 #if 0 696 dev_dbg(udc_dev(dum), "ep %p queue req %p to %s, len %d buf %p\n", 697 ep, _req, _ep->name, _req->length, _req->buf); 698 #endif 699 _req->status = -EINPROGRESS; 700 _req->actual = 0; 701 spin_lock_irqsave(&dum->lock, flags); 702 703 /* implement an emulated single-request FIFO */ 704 if (ep->desc && (ep->desc->bEndpointAddress & USB_DIR_IN) && 705 list_empty(&dum->fifo_req.queue) && 706 list_empty(&ep->queue) && 707 _req->length <= FIFO_SIZE) { 708 req = &dum->fifo_req; 709 req->req = *_req; 710 req->req.buf = dum->fifo_buf; 711 memcpy(dum->fifo_buf, _req->buf, _req->length); 712 req->req.context = dum; 713 req->req.complete = fifo_complete; 714 715 list_add_tail(&req->queue, &ep->queue); 716 spin_unlock(&dum->lock); 717 _req->actual = _req->length; 718 _req->status = 0; 719 usb_gadget_giveback_request(_ep, _req); 720 spin_lock(&dum->lock); 721 } else 722 list_add_tail(&req->queue, &ep->queue); 723 spin_unlock_irqrestore(&dum->lock, flags); 724 725 /* real hardware would likely enable transfers here, in case 726 * it'd been left NAKing. 727 */ 728 return 0; 729 } 730 731 static int dummy_dequeue(struct usb_ep *_ep, struct usb_request *_req) 732 { 733 struct dummy_ep *ep; 734 struct dummy *dum; 735 int retval = -EINVAL; 736 unsigned long flags; 737 struct dummy_request *req = NULL; 738 739 if (!_ep || !_req) 740 return retval; 741 ep = usb_ep_to_dummy_ep(_ep); 742 dum = ep_to_dummy(ep); 743 744 if (!dum->driver) 745 return -ESHUTDOWN; 746 747 local_irq_save(flags); 748 spin_lock(&dum->lock); 749 list_for_each_entry(req, &ep->queue, queue) { 750 if (&req->req == _req) { 751 list_del_init(&req->queue); 752 _req->status = -ECONNRESET; 753 retval = 0; 754 break; 755 } 756 } 757 spin_unlock(&dum->lock); 758 759 if (retval == 0) { 760 dev_dbg(udc_dev(dum), 761 "dequeued req %p from %s, len %d buf %p\n", 762 req, _ep->name, _req->length, _req->buf); 763 usb_gadget_giveback_request(_ep, _req); 764 } 765 local_irq_restore(flags); 766 return retval; 767 } 768 769 static int 770 dummy_set_halt_and_wedge(struct usb_ep *_ep, int value, int wedged) 771 { 772 struct dummy_ep *ep; 773 struct dummy *dum; 774 775 if (!_ep) 776 return -EINVAL; 777 ep = usb_ep_to_dummy_ep(_ep); 778 dum = ep_to_dummy(ep); 779 if (!dum->driver) 780 return -ESHUTDOWN; 781 if (!value) 782 ep->halted = ep->wedged = 0; 783 else if (ep->desc && (ep->desc->bEndpointAddress & USB_DIR_IN) && 784 !list_empty(&ep->queue)) 785 return -EAGAIN; 786 else { 787 ep->halted = 1; 788 if (wedged) 789 ep->wedged = 1; 790 } 791 /* FIXME clear emulated data toggle too */ 792 return 0; 793 } 794 795 static int 796 dummy_set_halt(struct usb_ep *_ep, int value) 797 { 798 return dummy_set_halt_and_wedge(_ep, value, 0); 799 } 800 801 static int dummy_set_wedge(struct usb_ep *_ep) 802 { 803 if (!_ep || _ep->name == ep0name) 804 return -EINVAL; 805 return dummy_set_halt_and_wedge(_ep, 1, 1); 806 } 807 808 static const struct usb_ep_ops dummy_ep_ops = { 809 .enable = dummy_enable, 810 .disable = dummy_disable, 811 812 .alloc_request = dummy_alloc_request, 813 .free_request = dummy_free_request, 814 815 .queue = dummy_queue, 816 .dequeue = dummy_dequeue, 817 818 .set_halt = dummy_set_halt, 819 .set_wedge = dummy_set_wedge, 820 }; 821 822 /*-------------------------------------------------------------------------*/ 823 824 /* there are both host and device side versions of this call ... */ 825 static int dummy_g_get_frame(struct usb_gadget *_gadget) 826 { 827 struct timespec64 ts64; 828 829 ktime_get_ts64(&ts64); 830 return ts64.tv_nsec / NSEC_PER_MSEC; 831 } 832 833 static int dummy_wakeup(struct usb_gadget *_gadget) 834 { 835 struct dummy_hcd *dum_hcd; 836 837 dum_hcd = gadget_to_dummy_hcd(_gadget); 838 if (!(dum_hcd->dum->devstatus & ((1 << USB_DEVICE_B_HNP_ENABLE) 839 | (1 << USB_DEVICE_REMOTE_WAKEUP)))) 840 return -EINVAL; 841 if ((dum_hcd->port_status & USB_PORT_STAT_CONNECTION) == 0) 842 return -ENOLINK; 843 if ((dum_hcd->port_status & USB_PORT_STAT_SUSPEND) == 0 && 844 dum_hcd->rh_state != DUMMY_RH_SUSPENDED) 845 return -EIO; 846 847 /* FIXME: What if the root hub is suspended but the port isn't? */ 848 849 /* hub notices our request, issues downstream resume, etc */ 850 dum_hcd->resuming = 1; 851 dum_hcd->re_timeout = jiffies + msecs_to_jiffies(20); 852 mod_timer(&dummy_hcd_to_hcd(dum_hcd)->rh_timer, dum_hcd->re_timeout); 853 return 0; 854 } 855 856 static int dummy_set_selfpowered(struct usb_gadget *_gadget, int value) 857 { 858 struct dummy *dum; 859 860 _gadget->is_selfpowered = (value != 0); 861 dum = gadget_to_dummy_hcd(_gadget)->dum; 862 if (value) 863 dum->devstatus |= (1 << USB_DEVICE_SELF_POWERED); 864 else 865 dum->devstatus &= ~(1 << USB_DEVICE_SELF_POWERED); 866 return 0; 867 } 868 869 static void dummy_udc_update_ep0(struct dummy *dum) 870 { 871 if (dum->gadget.speed == USB_SPEED_SUPER) 872 dum->ep[0].ep.maxpacket = 9; 873 else 874 dum->ep[0].ep.maxpacket = 64; 875 } 876 877 static int dummy_pullup(struct usb_gadget *_gadget, int value) 878 { 879 struct dummy_hcd *dum_hcd; 880 struct dummy *dum; 881 unsigned long flags; 882 883 dum = gadget_dev_to_dummy(&_gadget->dev); 884 dum_hcd = gadget_to_dummy_hcd(_gadget); 885 886 spin_lock_irqsave(&dum->lock, flags); 887 dum->pullup = (value != 0); 888 set_link_state(dum_hcd); 889 spin_unlock_irqrestore(&dum->lock, flags); 890 891 usb_hcd_poll_rh_status(dummy_hcd_to_hcd(dum_hcd)); 892 return 0; 893 } 894 895 static void dummy_udc_set_speed(struct usb_gadget *_gadget, 896 enum usb_device_speed speed) 897 { 898 struct dummy *dum; 899 900 dum = gadget_dev_to_dummy(&_gadget->dev); 901 902 if (mod_data.is_super_speed) 903 dum->gadget.speed = min_t(u8, USB_SPEED_SUPER, speed); 904 else if (mod_data.is_high_speed) 905 dum->gadget.speed = min_t(u8, USB_SPEED_HIGH, speed); 906 else 907 dum->gadget.speed = USB_SPEED_FULL; 908 909 dummy_udc_update_ep0(dum); 910 911 if (dum->gadget.speed < speed) 912 dev_dbg(udc_dev(dum), "This device can perform faster" 913 " if you connect it to a %s port...\n", 914 usb_speed_string(speed)); 915 } 916 917 static int dummy_udc_start(struct usb_gadget *g, 918 struct usb_gadget_driver *driver); 919 static int dummy_udc_stop(struct usb_gadget *g); 920 921 static const struct usb_gadget_ops dummy_ops = { 922 .get_frame = dummy_g_get_frame, 923 .wakeup = dummy_wakeup, 924 .set_selfpowered = dummy_set_selfpowered, 925 .pullup = dummy_pullup, 926 .udc_start = dummy_udc_start, 927 .udc_stop = dummy_udc_stop, 928 .udc_set_speed = dummy_udc_set_speed, 929 }; 930 931 /*-------------------------------------------------------------------------*/ 932 933 /* "function" sysfs attribute */ 934 static ssize_t function_show(struct device *dev, struct device_attribute *attr, 935 char *buf) 936 { 937 struct dummy *dum = gadget_dev_to_dummy(dev); 938 939 if (!dum->driver || !dum->driver->function) 940 return 0; 941 return scnprintf(buf, PAGE_SIZE, "%s\n", dum->driver->function); 942 } 943 static DEVICE_ATTR_RO(function); 944 945 /*-------------------------------------------------------------------------*/ 946 947 /* 948 * Driver registration/unregistration. 949 * 950 * This is basically hardware-specific; there's usually only one real USB 951 * device (not host) controller since that's how USB devices are intended 952 * to work. So most implementations of these api calls will rely on the 953 * fact that only one driver will ever bind to the hardware. But curious 954 * hardware can be built with discrete components, so the gadget API doesn't 955 * require that assumption. 956 * 957 * For this emulator, it might be convenient to create a usb slave device 958 * for each driver that registers: just add to a big root hub. 959 */ 960 961 static int dummy_udc_start(struct usb_gadget *g, 962 struct usb_gadget_driver *driver) 963 { 964 struct dummy_hcd *dum_hcd = gadget_to_dummy_hcd(g); 965 struct dummy *dum = dum_hcd->dum; 966 967 if (driver->max_speed == USB_SPEED_UNKNOWN) 968 return -EINVAL; 969 970 /* 971 * SLAVE side init ... the layer above hardware, which 972 * can't enumerate without help from the driver we're binding. 973 */ 974 975 dum->devstatus = 0; 976 dum->driver = driver; 977 978 return 0; 979 } 980 981 static int dummy_udc_stop(struct usb_gadget *g) 982 { 983 struct dummy_hcd *dum_hcd = gadget_to_dummy_hcd(g); 984 struct dummy *dum = dum_hcd->dum; 985 986 spin_lock_irq(&dum->lock); 987 dum->driver = NULL; 988 spin_unlock_irq(&dum->lock); 989 990 return 0; 991 } 992 993 #undef is_enabled 994 995 /* The gadget structure is stored inside the hcd structure and will be 996 * released along with it. */ 997 static void init_dummy_udc_hw(struct dummy *dum) 998 { 999 int i; 1000 1001 INIT_LIST_HEAD(&dum->gadget.ep_list); 1002 for (i = 0; i < DUMMY_ENDPOINTS; i++) { 1003 struct dummy_ep *ep = &dum->ep[i]; 1004 1005 if (!ep_info[i].name) 1006 break; 1007 ep->ep.name = ep_info[i].name; 1008 ep->ep.caps = ep_info[i].caps; 1009 ep->ep.ops = &dummy_ep_ops; 1010 list_add_tail(&ep->ep.ep_list, &dum->gadget.ep_list); 1011 ep->halted = ep->wedged = ep->already_seen = 1012 ep->setup_stage = 0; 1013 usb_ep_set_maxpacket_limit(&ep->ep, ~0); 1014 ep->ep.max_streams = 16; 1015 ep->last_io = jiffies; 1016 ep->gadget = &dum->gadget; 1017 ep->desc = NULL; 1018 INIT_LIST_HEAD(&ep->queue); 1019 } 1020 1021 dum->gadget.ep0 = &dum->ep[0].ep; 1022 list_del_init(&dum->ep[0].ep.ep_list); 1023 INIT_LIST_HEAD(&dum->fifo_req.queue); 1024 1025 #ifdef CONFIG_USB_OTG 1026 dum->gadget.is_otg = 1; 1027 #endif 1028 } 1029 1030 static int dummy_udc_probe(struct platform_device *pdev) 1031 { 1032 struct dummy *dum; 1033 int rc; 1034 1035 dum = *((void **)dev_get_platdata(&pdev->dev)); 1036 /* Clear usb_gadget region for new registration to udc-core */ 1037 memzero_explicit(&dum->gadget, sizeof(struct usb_gadget)); 1038 dum->gadget.name = gadget_name; 1039 dum->gadget.ops = &dummy_ops; 1040 dum->gadget.max_speed = USB_SPEED_SUPER; 1041 1042 dum->gadget.dev.parent = &pdev->dev; 1043 init_dummy_udc_hw(dum); 1044 1045 rc = usb_add_gadget_udc(&pdev->dev, &dum->gadget); 1046 if (rc < 0) 1047 goto err_udc; 1048 1049 rc = device_create_file(&dum->gadget.dev, &dev_attr_function); 1050 if (rc < 0) 1051 goto err_dev; 1052 platform_set_drvdata(pdev, dum); 1053 return rc; 1054 1055 err_dev: 1056 usb_del_gadget_udc(&dum->gadget); 1057 err_udc: 1058 return rc; 1059 } 1060 1061 static int dummy_udc_remove(struct platform_device *pdev) 1062 { 1063 struct dummy *dum = platform_get_drvdata(pdev); 1064 1065 device_remove_file(&dum->gadget.dev, &dev_attr_function); 1066 usb_del_gadget_udc(&dum->gadget); 1067 return 0; 1068 } 1069 1070 static void dummy_udc_pm(struct dummy *dum, struct dummy_hcd *dum_hcd, 1071 int suspend) 1072 { 1073 spin_lock_irq(&dum->lock); 1074 dum->udc_suspended = suspend; 1075 set_link_state(dum_hcd); 1076 spin_unlock_irq(&dum->lock); 1077 } 1078 1079 static int dummy_udc_suspend(struct platform_device *pdev, pm_message_t state) 1080 { 1081 struct dummy *dum = platform_get_drvdata(pdev); 1082 struct dummy_hcd *dum_hcd = gadget_to_dummy_hcd(&dum->gadget); 1083 1084 dev_dbg(&pdev->dev, "%s\n", __func__); 1085 dummy_udc_pm(dum, dum_hcd, 1); 1086 usb_hcd_poll_rh_status(dummy_hcd_to_hcd(dum_hcd)); 1087 return 0; 1088 } 1089 1090 static int dummy_udc_resume(struct platform_device *pdev) 1091 { 1092 struct dummy *dum = platform_get_drvdata(pdev); 1093 struct dummy_hcd *dum_hcd = gadget_to_dummy_hcd(&dum->gadget); 1094 1095 dev_dbg(&pdev->dev, "%s\n", __func__); 1096 dummy_udc_pm(dum, dum_hcd, 0); 1097 usb_hcd_poll_rh_status(dummy_hcd_to_hcd(dum_hcd)); 1098 return 0; 1099 } 1100 1101 static struct platform_driver dummy_udc_driver = { 1102 .probe = dummy_udc_probe, 1103 .remove = dummy_udc_remove, 1104 .suspend = dummy_udc_suspend, 1105 .resume = dummy_udc_resume, 1106 .driver = { 1107 .name = (char *) gadget_name, 1108 }, 1109 }; 1110 1111 /*-------------------------------------------------------------------------*/ 1112 1113 static unsigned int dummy_get_ep_idx(const struct usb_endpoint_descriptor *desc) 1114 { 1115 unsigned int index; 1116 1117 index = usb_endpoint_num(desc) << 1; 1118 if (usb_endpoint_dir_in(desc)) 1119 index |= 1; 1120 return index; 1121 } 1122 1123 /* MASTER/HOST SIDE DRIVER 1124 * 1125 * this uses the hcd framework to hook up to host side drivers. 1126 * its root hub will only have one device, otherwise it acts like 1127 * a normal host controller. 1128 * 1129 * when urbs are queued, they're just stuck on a list that we 1130 * scan in a timer callback. that callback connects writes from 1131 * the host with reads from the device, and so on, based on the 1132 * usb 2.0 rules. 1133 */ 1134 1135 static int dummy_ep_stream_en(struct dummy_hcd *dum_hcd, struct urb *urb) 1136 { 1137 const struct usb_endpoint_descriptor *desc = &urb->ep->desc; 1138 u32 index; 1139 1140 if (!usb_endpoint_xfer_bulk(desc)) 1141 return 0; 1142 1143 index = dummy_get_ep_idx(desc); 1144 return (1 << index) & dum_hcd->stream_en_ep; 1145 } 1146 1147 /* 1148 * The max stream number is saved as a nibble so for the 30 possible endpoints 1149 * we only 15 bytes of memory. Therefore we are limited to max 16 streams (0 1150 * means we use only 1 stream). The maximum according to the spec is 16bit so 1151 * if the 16 stream limit is about to go, the array size should be incremented 1152 * to 30 elements of type u16. 1153 */ 1154 static int get_max_streams_for_pipe(struct dummy_hcd *dum_hcd, 1155 unsigned int pipe) 1156 { 1157 int max_streams; 1158 1159 max_streams = dum_hcd->num_stream[usb_pipeendpoint(pipe)]; 1160 if (usb_pipeout(pipe)) 1161 max_streams >>= 4; 1162 else 1163 max_streams &= 0xf; 1164 max_streams++; 1165 return max_streams; 1166 } 1167 1168 static void set_max_streams_for_pipe(struct dummy_hcd *dum_hcd, 1169 unsigned int pipe, unsigned int streams) 1170 { 1171 int max_streams; 1172 1173 streams--; 1174 max_streams = dum_hcd->num_stream[usb_pipeendpoint(pipe)]; 1175 if (usb_pipeout(pipe)) { 1176 streams <<= 4; 1177 max_streams &= 0xf; 1178 } else { 1179 max_streams &= 0xf0; 1180 } 1181 max_streams |= streams; 1182 dum_hcd->num_stream[usb_pipeendpoint(pipe)] = max_streams; 1183 } 1184 1185 static int dummy_validate_stream(struct dummy_hcd *dum_hcd, struct urb *urb) 1186 { 1187 unsigned int max_streams; 1188 int enabled; 1189 1190 enabled = dummy_ep_stream_en(dum_hcd, urb); 1191 if (!urb->stream_id) { 1192 if (enabled) 1193 return -EINVAL; 1194 return 0; 1195 } 1196 if (!enabled) 1197 return -EINVAL; 1198 1199 max_streams = get_max_streams_for_pipe(dum_hcd, 1200 usb_pipeendpoint(urb->pipe)); 1201 if (urb->stream_id > max_streams) { 1202 dev_err(dummy_dev(dum_hcd), "Stream id %d is out of range.\n", 1203 urb->stream_id); 1204 BUG(); 1205 return -EINVAL; 1206 } 1207 return 0; 1208 } 1209 1210 static int dummy_urb_enqueue( 1211 struct usb_hcd *hcd, 1212 struct urb *urb, 1213 gfp_t mem_flags 1214 ) { 1215 struct dummy_hcd *dum_hcd; 1216 struct urbp *urbp; 1217 unsigned long flags; 1218 int rc; 1219 1220 urbp = kmalloc(sizeof *urbp, mem_flags); 1221 if (!urbp) 1222 return -ENOMEM; 1223 urbp->urb = urb; 1224 urbp->miter_started = 0; 1225 1226 dum_hcd = hcd_to_dummy_hcd(hcd); 1227 spin_lock_irqsave(&dum_hcd->dum->lock, flags); 1228 1229 rc = dummy_validate_stream(dum_hcd, urb); 1230 if (rc) { 1231 kfree(urbp); 1232 goto done; 1233 } 1234 1235 rc = usb_hcd_link_urb_to_ep(hcd, urb); 1236 if (rc) { 1237 kfree(urbp); 1238 goto done; 1239 } 1240 1241 if (!dum_hcd->udev) { 1242 dum_hcd->udev = urb->dev; 1243 usb_get_dev(dum_hcd->udev); 1244 } else if (unlikely(dum_hcd->udev != urb->dev)) 1245 dev_err(dummy_dev(dum_hcd), "usb_device address has changed!\n"); 1246 1247 list_add_tail(&urbp->urbp_list, &dum_hcd->urbp_list); 1248 urb->hcpriv = urbp; 1249 if (usb_pipetype(urb->pipe) == PIPE_CONTROL) 1250 urb->error_count = 1; /* mark as a new urb */ 1251 1252 /* kick the scheduler, it'll do the rest */ 1253 if (!timer_pending(&dum_hcd->timer)) 1254 mod_timer(&dum_hcd->timer, jiffies + 1); 1255 1256 done: 1257 spin_unlock_irqrestore(&dum_hcd->dum->lock, flags); 1258 return rc; 1259 } 1260 1261 static int dummy_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status) 1262 { 1263 struct dummy_hcd *dum_hcd; 1264 unsigned long flags; 1265 int rc; 1266 1267 /* giveback happens automatically in timer callback, 1268 * so make sure the callback happens */ 1269 dum_hcd = hcd_to_dummy_hcd(hcd); 1270 spin_lock_irqsave(&dum_hcd->dum->lock, flags); 1271 1272 rc = usb_hcd_check_unlink_urb(hcd, urb, status); 1273 if (!rc && dum_hcd->rh_state != DUMMY_RH_RUNNING && 1274 !list_empty(&dum_hcd->urbp_list)) 1275 mod_timer(&dum_hcd->timer, jiffies); 1276 1277 spin_unlock_irqrestore(&dum_hcd->dum->lock, flags); 1278 return rc; 1279 } 1280 1281 static int dummy_perform_transfer(struct urb *urb, struct dummy_request *req, 1282 u32 len) 1283 { 1284 void *ubuf, *rbuf; 1285 struct urbp *urbp = urb->hcpriv; 1286 int to_host; 1287 struct sg_mapping_iter *miter = &urbp->miter; 1288 u32 trans = 0; 1289 u32 this_sg; 1290 bool next_sg; 1291 1292 to_host = usb_pipein(urb->pipe); 1293 rbuf = req->req.buf + req->req.actual; 1294 1295 if (!urb->num_sgs) { 1296 ubuf = urb->transfer_buffer + urb->actual_length; 1297 if (to_host) 1298 memcpy(ubuf, rbuf, len); 1299 else 1300 memcpy(rbuf, ubuf, len); 1301 return len; 1302 } 1303 1304 if (!urbp->miter_started) { 1305 u32 flags = SG_MITER_ATOMIC; 1306 1307 if (to_host) 1308 flags |= SG_MITER_TO_SG; 1309 else 1310 flags |= SG_MITER_FROM_SG; 1311 1312 sg_miter_start(miter, urb->sg, urb->num_sgs, flags); 1313 urbp->miter_started = 1; 1314 } 1315 next_sg = sg_miter_next(miter); 1316 if (next_sg == false) { 1317 WARN_ON_ONCE(1); 1318 return -EINVAL; 1319 } 1320 do { 1321 ubuf = miter->addr; 1322 this_sg = min_t(u32, len, miter->length); 1323 miter->consumed = this_sg; 1324 trans += this_sg; 1325 1326 if (to_host) 1327 memcpy(ubuf, rbuf, this_sg); 1328 else 1329 memcpy(rbuf, ubuf, this_sg); 1330 len -= this_sg; 1331 1332 if (!len) 1333 break; 1334 next_sg = sg_miter_next(miter); 1335 if (next_sg == false) { 1336 WARN_ON_ONCE(1); 1337 return -EINVAL; 1338 } 1339 1340 rbuf += this_sg; 1341 } while (1); 1342 1343 sg_miter_stop(miter); 1344 return trans; 1345 } 1346 1347 /* transfer up to a frame's worth; caller must own lock */ 1348 static int transfer(struct dummy_hcd *dum_hcd, struct urb *urb, 1349 struct dummy_ep *ep, int limit, int *status) 1350 { 1351 struct dummy *dum = dum_hcd->dum; 1352 struct dummy_request *req; 1353 int sent = 0; 1354 1355 top: 1356 /* if there's no request queued, the device is NAKing; return */ 1357 list_for_each_entry(req, &ep->queue, queue) { 1358 unsigned host_len, dev_len, len; 1359 int is_short, to_host; 1360 int rescan = 0; 1361 1362 if (dummy_ep_stream_en(dum_hcd, urb)) { 1363 if ((urb->stream_id != req->req.stream_id)) 1364 continue; 1365 } 1366 1367 /* 1..N packets of ep->ep.maxpacket each ... the last one 1368 * may be short (including zero length). 1369 * 1370 * writer can send a zlp explicitly (length 0) or implicitly 1371 * (length mod maxpacket zero, and 'zero' flag); they always 1372 * terminate reads. 1373 */ 1374 host_len = urb->transfer_buffer_length - urb->actual_length; 1375 dev_len = req->req.length - req->req.actual; 1376 len = min(host_len, dev_len); 1377 1378 /* FIXME update emulated data toggle too */ 1379 1380 to_host = usb_pipein(urb->pipe); 1381 if (unlikely(len == 0)) 1382 is_short = 1; 1383 else { 1384 /* not enough bandwidth left? */ 1385 if (limit < ep->ep.maxpacket && limit < len) 1386 break; 1387 len = min_t(unsigned, len, limit); 1388 if (len == 0) 1389 break; 1390 1391 /* send multiple of maxpacket first, then remainder */ 1392 if (len >= ep->ep.maxpacket) { 1393 is_short = 0; 1394 if (len % ep->ep.maxpacket) 1395 rescan = 1; 1396 len -= len % ep->ep.maxpacket; 1397 } else { 1398 is_short = 1; 1399 } 1400 1401 len = dummy_perform_transfer(urb, req, len); 1402 1403 ep->last_io = jiffies; 1404 if ((int)len < 0) { 1405 req->req.status = len; 1406 } else { 1407 limit -= len; 1408 sent += len; 1409 urb->actual_length += len; 1410 req->req.actual += len; 1411 } 1412 } 1413 1414 /* short packets terminate, maybe with overflow/underflow. 1415 * it's only really an error to write too much. 1416 * 1417 * partially filling a buffer optionally blocks queue advances 1418 * (so completion handlers can clean up the queue) but we don't 1419 * need to emulate such data-in-flight. 1420 */ 1421 if (is_short) { 1422 if (host_len == dev_len) { 1423 req->req.status = 0; 1424 *status = 0; 1425 } else if (to_host) { 1426 req->req.status = 0; 1427 if (dev_len > host_len) 1428 *status = -EOVERFLOW; 1429 else 1430 *status = 0; 1431 } else { 1432 *status = 0; 1433 if (host_len > dev_len) 1434 req->req.status = -EOVERFLOW; 1435 else 1436 req->req.status = 0; 1437 } 1438 1439 /* 1440 * many requests terminate without a short packet. 1441 * send a zlp if demanded by flags. 1442 */ 1443 } else { 1444 if (req->req.length == req->req.actual) { 1445 if (req->req.zero && to_host) 1446 rescan = 1; 1447 else 1448 req->req.status = 0; 1449 } 1450 if (urb->transfer_buffer_length == urb->actual_length) { 1451 if (urb->transfer_flags & URB_ZERO_PACKET && 1452 !to_host) 1453 rescan = 1; 1454 else 1455 *status = 0; 1456 } 1457 } 1458 1459 /* device side completion --> continuable */ 1460 if (req->req.status != -EINPROGRESS) { 1461 list_del_init(&req->queue); 1462 1463 spin_unlock(&dum->lock); 1464 usb_gadget_giveback_request(&ep->ep, &req->req); 1465 spin_lock(&dum->lock); 1466 1467 /* requests might have been unlinked... */ 1468 rescan = 1; 1469 } 1470 1471 /* host side completion --> terminate */ 1472 if (*status != -EINPROGRESS) 1473 break; 1474 1475 /* rescan to continue with any other queued i/o */ 1476 if (rescan) 1477 goto top; 1478 } 1479 return sent; 1480 } 1481 1482 static int periodic_bytes(struct dummy *dum, struct dummy_ep *ep) 1483 { 1484 int limit = ep->ep.maxpacket; 1485 1486 if (dum->gadget.speed == USB_SPEED_HIGH) { 1487 int tmp; 1488 1489 /* high bandwidth mode */ 1490 tmp = usb_endpoint_maxp_mult(ep->desc); 1491 tmp *= 8 /* applies to entire frame */; 1492 limit += limit * tmp; 1493 } 1494 if (dum->gadget.speed == USB_SPEED_SUPER) { 1495 switch (usb_endpoint_type(ep->desc)) { 1496 case USB_ENDPOINT_XFER_ISOC: 1497 /* Sec. 4.4.8.2 USB3.0 Spec */ 1498 limit = 3 * 16 * 1024 * 8; 1499 break; 1500 case USB_ENDPOINT_XFER_INT: 1501 /* Sec. 4.4.7.2 USB3.0 Spec */ 1502 limit = 3 * 1024 * 8; 1503 break; 1504 case USB_ENDPOINT_XFER_BULK: 1505 default: 1506 break; 1507 } 1508 } 1509 return limit; 1510 } 1511 1512 #define is_active(dum_hcd) ((dum_hcd->port_status & \ 1513 (USB_PORT_STAT_CONNECTION | USB_PORT_STAT_ENABLE | \ 1514 USB_PORT_STAT_SUSPEND)) \ 1515 == (USB_PORT_STAT_CONNECTION | USB_PORT_STAT_ENABLE)) 1516 1517 static struct dummy_ep *find_endpoint(struct dummy *dum, u8 address) 1518 { 1519 int i; 1520 1521 if (!is_active((dum->gadget.speed == USB_SPEED_SUPER ? 1522 dum->ss_hcd : dum->hs_hcd))) 1523 return NULL; 1524 if ((address & ~USB_DIR_IN) == 0) 1525 return &dum->ep[0]; 1526 for (i = 1; i < DUMMY_ENDPOINTS; i++) { 1527 struct dummy_ep *ep = &dum->ep[i]; 1528 1529 if (!ep->desc) 1530 continue; 1531 if (ep->desc->bEndpointAddress == address) 1532 return ep; 1533 } 1534 return NULL; 1535 } 1536 1537 #undef is_active 1538 1539 #define Dev_Request (USB_TYPE_STANDARD | USB_RECIP_DEVICE) 1540 #define Dev_InRequest (Dev_Request | USB_DIR_IN) 1541 #define Intf_Request (USB_TYPE_STANDARD | USB_RECIP_INTERFACE) 1542 #define Intf_InRequest (Intf_Request | USB_DIR_IN) 1543 #define Ep_Request (USB_TYPE_STANDARD | USB_RECIP_ENDPOINT) 1544 #define Ep_InRequest (Ep_Request | USB_DIR_IN) 1545 1546 1547 /** 1548 * handle_control_request() - handles all control transfers 1549 * @dum: pointer to dummy (the_controller) 1550 * @urb: the urb request to handle 1551 * @setup: pointer to the setup data for a USB device control 1552 * request 1553 * @status: pointer to request handling status 1554 * 1555 * Return 0 - if the request was handled 1556 * 1 - if the request wasn't handles 1557 * error code on error 1558 */ 1559 static int handle_control_request(struct dummy_hcd *dum_hcd, struct urb *urb, 1560 struct usb_ctrlrequest *setup, 1561 int *status) 1562 { 1563 struct dummy_ep *ep2; 1564 struct dummy *dum = dum_hcd->dum; 1565 int ret_val = 1; 1566 unsigned w_index; 1567 unsigned w_value; 1568 1569 w_index = le16_to_cpu(setup->wIndex); 1570 w_value = le16_to_cpu(setup->wValue); 1571 switch (setup->bRequest) { 1572 case USB_REQ_SET_ADDRESS: 1573 if (setup->bRequestType != Dev_Request) 1574 break; 1575 dum->address = w_value; 1576 *status = 0; 1577 dev_dbg(udc_dev(dum), "set_address = %d\n", 1578 w_value); 1579 ret_val = 0; 1580 break; 1581 case USB_REQ_SET_FEATURE: 1582 if (setup->bRequestType == Dev_Request) { 1583 ret_val = 0; 1584 switch (w_value) { 1585 case USB_DEVICE_REMOTE_WAKEUP: 1586 break; 1587 case USB_DEVICE_B_HNP_ENABLE: 1588 dum->gadget.b_hnp_enable = 1; 1589 break; 1590 case USB_DEVICE_A_HNP_SUPPORT: 1591 dum->gadget.a_hnp_support = 1; 1592 break; 1593 case USB_DEVICE_A_ALT_HNP_SUPPORT: 1594 dum->gadget.a_alt_hnp_support = 1; 1595 break; 1596 case USB_DEVICE_U1_ENABLE: 1597 if (dummy_hcd_to_hcd(dum_hcd)->speed == 1598 HCD_USB3) 1599 w_value = USB_DEV_STAT_U1_ENABLED; 1600 else 1601 ret_val = -EOPNOTSUPP; 1602 break; 1603 case USB_DEVICE_U2_ENABLE: 1604 if (dummy_hcd_to_hcd(dum_hcd)->speed == 1605 HCD_USB3) 1606 w_value = USB_DEV_STAT_U2_ENABLED; 1607 else 1608 ret_val = -EOPNOTSUPP; 1609 break; 1610 case USB_DEVICE_LTM_ENABLE: 1611 if (dummy_hcd_to_hcd(dum_hcd)->speed == 1612 HCD_USB3) 1613 w_value = USB_DEV_STAT_LTM_ENABLED; 1614 else 1615 ret_val = -EOPNOTSUPP; 1616 break; 1617 default: 1618 ret_val = -EOPNOTSUPP; 1619 } 1620 if (ret_val == 0) { 1621 dum->devstatus |= (1 << w_value); 1622 *status = 0; 1623 } 1624 } else if (setup->bRequestType == Ep_Request) { 1625 /* endpoint halt */ 1626 ep2 = find_endpoint(dum, w_index); 1627 if (!ep2 || ep2->ep.name == ep0name) { 1628 ret_val = -EOPNOTSUPP; 1629 break; 1630 } 1631 ep2->halted = 1; 1632 ret_val = 0; 1633 *status = 0; 1634 } 1635 break; 1636 case USB_REQ_CLEAR_FEATURE: 1637 if (setup->bRequestType == Dev_Request) { 1638 ret_val = 0; 1639 switch (w_value) { 1640 case USB_DEVICE_REMOTE_WAKEUP: 1641 w_value = USB_DEVICE_REMOTE_WAKEUP; 1642 break; 1643 case USB_DEVICE_U1_ENABLE: 1644 if (dummy_hcd_to_hcd(dum_hcd)->speed == 1645 HCD_USB3) 1646 w_value = USB_DEV_STAT_U1_ENABLED; 1647 else 1648 ret_val = -EOPNOTSUPP; 1649 break; 1650 case USB_DEVICE_U2_ENABLE: 1651 if (dummy_hcd_to_hcd(dum_hcd)->speed == 1652 HCD_USB3) 1653 w_value = USB_DEV_STAT_U2_ENABLED; 1654 else 1655 ret_val = -EOPNOTSUPP; 1656 break; 1657 case USB_DEVICE_LTM_ENABLE: 1658 if (dummy_hcd_to_hcd(dum_hcd)->speed == 1659 HCD_USB3) 1660 w_value = USB_DEV_STAT_LTM_ENABLED; 1661 else 1662 ret_val = -EOPNOTSUPP; 1663 break; 1664 default: 1665 ret_val = -EOPNOTSUPP; 1666 break; 1667 } 1668 if (ret_val == 0) { 1669 dum->devstatus &= ~(1 << w_value); 1670 *status = 0; 1671 } 1672 } else if (setup->bRequestType == Ep_Request) { 1673 /* endpoint halt */ 1674 ep2 = find_endpoint(dum, w_index); 1675 if (!ep2) { 1676 ret_val = -EOPNOTSUPP; 1677 break; 1678 } 1679 if (!ep2->wedged) 1680 ep2->halted = 0; 1681 ret_val = 0; 1682 *status = 0; 1683 } 1684 break; 1685 case USB_REQ_GET_STATUS: 1686 if (setup->bRequestType == Dev_InRequest 1687 || setup->bRequestType == Intf_InRequest 1688 || setup->bRequestType == Ep_InRequest) { 1689 char *buf; 1690 /* 1691 * device: remote wakeup, selfpowered 1692 * interface: nothing 1693 * endpoint: halt 1694 */ 1695 buf = (char *)urb->transfer_buffer; 1696 if (urb->transfer_buffer_length > 0) { 1697 if (setup->bRequestType == Ep_InRequest) { 1698 ep2 = find_endpoint(dum, w_index); 1699 if (!ep2) { 1700 ret_val = -EOPNOTSUPP; 1701 break; 1702 } 1703 buf[0] = ep2->halted; 1704 } else if (setup->bRequestType == 1705 Dev_InRequest) { 1706 buf[0] = (u8)dum->devstatus; 1707 } else 1708 buf[0] = 0; 1709 } 1710 if (urb->transfer_buffer_length > 1) 1711 buf[1] = 0; 1712 urb->actual_length = min_t(u32, 2, 1713 urb->transfer_buffer_length); 1714 ret_val = 0; 1715 *status = 0; 1716 } 1717 break; 1718 } 1719 return ret_val; 1720 } 1721 1722 /* drive both sides of the transfers; looks like irq handlers to 1723 * both drivers except the callbacks aren't in_irq(). 1724 */ 1725 static void dummy_timer(unsigned long _dum_hcd) 1726 { 1727 struct dummy_hcd *dum_hcd = (struct dummy_hcd *) _dum_hcd; 1728 struct dummy *dum = dum_hcd->dum; 1729 struct urbp *urbp, *tmp; 1730 unsigned long flags; 1731 int limit, total; 1732 int i; 1733 1734 /* simplistic model for one frame's bandwidth */ 1735 switch (dum->gadget.speed) { 1736 case USB_SPEED_LOW: 1737 total = 8/*bytes*/ * 12/*packets*/; 1738 break; 1739 case USB_SPEED_FULL: 1740 total = 64/*bytes*/ * 19/*packets*/; 1741 break; 1742 case USB_SPEED_HIGH: 1743 total = 512/*bytes*/ * 13/*packets*/ * 8/*uframes*/; 1744 break; 1745 case USB_SPEED_SUPER: 1746 /* Bus speed is 500000 bytes/ms, so use a little less */ 1747 total = 490000; 1748 break; 1749 default: 1750 dev_err(dummy_dev(dum_hcd), "bogus device speed\n"); 1751 return; 1752 } 1753 1754 /* FIXME if HZ != 1000 this will probably misbehave ... */ 1755 1756 /* look at each urb queued by the host side driver */ 1757 spin_lock_irqsave(&dum->lock, flags); 1758 1759 if (!dum_hcd->udev) { 1760 dev_err(dummy_dev(dum_hcd), 1761 "timer fired with no URBs pending?\n"); 1762 spin_unlock_irqrestore(&dum->lock, flags); 1763 return; 1764 } 1765 1766 for (i = 0; i < DUMMY_ENDPOINTS; i++) { 1767 if (!ep_info[i].name) 1768 break; 1769 dum->ep[i].already_seen = 0; 1770 } 1771 1772 restart: 1773 list_for_each_entry_safe(urbp, tmp, &dum_hcd->urbp_list, urbp_list) { 1774 struct urb *urb; 1775 struct dummy_request *req; 1776 u8 address; 1777 struct dummy_ep *ep = NULL; 1778 int type; 1779 int status = -EINPROGRESS; 1780 1781 urb = urbp->urb; 1782 if (urb->unlinked) 1783 goto return_urb; 1784 else if (dum_hcd->rh_state != DUMMY_RH_RUNNING) 1785 continue; 1786 type = usb_pipetype(urb->pipe); 1787 1788 /* used up this frame's non-periodic bandwidth? 1789 * FIXME there's infinite bandwidth for control and 1790 * periodic transfers ... unrealistic. 1791 */ 1792 if (total <= 0 && type == PIPE_BULK) 1793 continue; 1794 1795 /* find the gadget's ep for this request (if configured) */ 1796 address = usb_pipeendpoint (urb->pipe); 1797 if (usb_pipein(urb->pipe)) 1798 address |= USB_DIR_IN; 1799 ep = find_endpoint(dum, address); 1800 if (!ep) { 1801 /* set_configuration() disagreement */ 1802 dev_dbg(dummy_dev(dum_hcd), 1803 "no ep configured for urb %p\n", 1804 urb); 1805 status = -EPROTO; 1806 goto return_urb; 1807 } 1808 1809 if (ep->already_seen) 1810 continue; 1811 ep->already_seen = 1; 1812 if (ep == &dum->ep[0] && urb->error_count) { 1813 ep->setup_stage = 1; /* a new urb */ 1814 urb->error_count = 0; 1815 } 1816 if (ep->halted && !ep->setup_stage) { 1817 /* NOTE: must not be iso! */ 1818 dev_dbg(dummy_dev(dum_hcd), "ep %s halted, urb %p\n", 1819 ep->ep.name, urb); 1820 status = -EPIPE; 1821 goto return_urb; 1822 } 1823 /* FIXME make sure both ends agree on maxpacket */ 1824 1825 /* handle control requests */ 1826 if (ep == &dum->ep[0] && ep->setup_stage) { 1827 struct usb_ctrlrequest setup; 1828 int value = 1; 1829 1830 setup = *(struct usb_ctrlrequest *) urb->setup_packet; 1831 /* paranoia, in case of stale queued data */ 1832 list_for_each_entry(req, &ep->queue, queue) { 1833 list_del_init(&req->queue); 1834 req->req.status = -EOVERFLOW; 1835 dev_dbg(udc_dev(dum), "stale req = %p\n", 1836 req); 1837 1838 spin_unlock(&dum->lock); 1839 usb_gadget_giveback_request(&ep->ep, &req->req); 1840 spin_lock(&dum->lock); 1841 ep->already_seen = 0; 1842 goto restart; 1843 } 1844 1845 /* gadget driver never sees set_address or operations 1846 * on standard feature flags. some hardware doesn't 1847 * even expose them. 1848 */ 1849 ep->last_io = jiffies; 1850 ep->setup_stage = 0; 1851 ep->halted = 0; 1852 1853 value = handle_control_request(dum_hcd, urb, &setup, 1854 &status); 1855 1856 /* gadget driver handles all other requests. block 1857 * until setup() returns; no reentrancy issues etc. 1858 */ 1859 if (value > 0) { 1860 spin_unlock(&dum->lock); 1861 value = dum->driver->setup(&dum->gadget, 1862 &setup); 1863 spin_lock(&dum->lock); 1864 1865 if (value >= 0) { 1866 /* no delays (max 64KB data stage) */ 1867 limit = 64*1024; 1868 goto treat_control_like_bulk; 1869 } 1870 /* error, see below */ 1871 } 1872 1873 if (value < 0) { 1874 if (value != -EOPNOTSUPP) 1875 dev_dbg(udc_dev(dum), 1876 "setup --> %d\n", 1877 value); 1878 status = -EPIPE; 1879 urb->actual_length = 0; 1880 } 1881 1882 goto return_urb; 1883 } 1884 1885 /* non-control requests */ 1886 limit = total; 1887 switch (usb_pipetype(urb->pipe)) { 1888 case PIPE_ISOCHRONOUS: 1889 /* FIXME is it urb->interval since the last xfer? 1890 * use urb->iso_frame_desc[i]. 1891 * complete whether or not ep has requests queued. 1892 * report random errors, to debug drivers. 1893 */ 1894 limit = max(limit, periodic_bytes(dum, ep)); 1895 status = -ENOSYS; 1896 break; 1897 1898 case PIPE_INTERRUPT: 1899 /* FIXME is it urb->interval since the last xfer? 1900 * this almost certainly polls too fast. 1901 */ 1902 limit = max(limit, periodic_bytes(dum, ep)); 1903 /* FALLTHROUGH */ 1904 1905 default: 1906 treat_control_like_bulk: 1907 ep->last_io = jiffies; 1908 total -= transfer(dum_hcd, urb, ep, limit, &status); 1909 break; 1910 } 1911 1912 /* incomplete transfer? */ 1913 if (status == -EINPROGRESS) 1914 continue; 1915 1916 return_urb: 1917 list_del(&urbp->urbp_list); 1918 kfree(urbp); 1919 if (ep) 1920 ep->already_seen = ep->setup_stage = 0; 1921 1922 usb_hcd_unlink_urb_from_ep(dummy_hcd_to_hcd(dum_hcd), urb); 1923 spin_unlock(&dum->lock); 1924 usb_hcd_giveback_urb(dummy_hcd_to_hcd(dum_hcd), urb, status); 1925 spin_lock(&dum->lock); 1926 1927 goto restart; 1928 } 1929 1930 if (list_empty(&dum_hcd->urbp_list)) { 1931 usb_put_dev(dum_hcd->udev); 1932 dum_hcd->udev = NULL; 1933 } else if (dum_hcd->rh_state == DUMMY_RH_RUNNING) { 1934 /* want a 1 msec delay here */ 1935 mod_timer(&dum_hcd->timer, jiffies + msecs_to_jiffies(1)); 1936 } 1937 1938 spin_unlock_irqrestore(&dum->lock, flags); 1939 } 1940 1941 /*-------------------------------------------------------------------------*/ 1942 1943 #define PORT_C_MASK \ 1944 ((USB_PORT_STAT_C_CONNECTION \ 1945 | USB_PORT_STAT_C_ENABLE \ 1946 | USB_PORT_STAT_C_SUSPEND \ 1947 | USB_PORT_STAT_C_OVERCURRENT \ 1948 | USB_PORT_STAT_C_RESET) << 16) 1949 1950 static int dummy_hub_status(struct usb_hcd *hcd, char *buf) 1951 { 1952 struct dummy_hcd *dum_hcd; 1953 unsigned long flags; 1954 int retval = 0; 1955 1956 dum_hcd = hcd_to_dummy_hcd(hcd); 1957 1958 spin_lock_irqsave(&dum_hcd->dum->lock, flags); 1959 if (!HCD_HW_ACCESSIBLE(hcd)) 1960 goto done; 1961 1962 if (dum_hcd->resuming && time_after_eq(jiffies, dum_hcd->re_timeout)) { 1963 dum_hcd->port_status |= (USB_PORT_STAT_C_SUSPEND << 16); 1964 dum_hcd->port_status &= ~USB_PORT_STAT_SUSPEND; 1965 set_link_state(dum_hcd); 1966 } 1967 1968 if ((dum_hcd->port_status & PORT_C_MASK) != 0) { 1969 *buf = (1 << 1); 1970 dev_dbg(dummy_dev(dum_hcd), "port status 0x%08x has changes\n", 1971 dum_hcd->port_status); 1972 retval = 1; 1973 if (dum_hcd->rh_state == DUMMY_RH_SUSPENDED) 1974 usb_hcd_resume_root_hub(hcd); 1975 } 1976 done: 1977 spin_unlock_irqrestore(&dum_hcd->dum->lock, flags); 1978 return retval; 1979 } 1980 1981 /* usb 3.0 root hub device descriptor */ 1982 static struct { 1983 struct usb_bos_descriptor bos; 1984 struct usb_ss_cap_descriptor ss_cap; 1985 } __packed usb3_bos_desc = { 1986 1987 .bos = { 1988 .bLength = USB_DT_BOS_SIZE, 1989 .bDescriptorType = USB_DT_BOS, 1990 .wTotalLength = cpu_to_le16(sizeof(usb3_bos_desc)), 1991 .bNumDeviceCaps = 1, 1992 }, 1993 .ss_cap = { 1994 .bLength = USB_DT_USB_SS_CAP_SIZE, 1995 .bDescriptorType = USB_DT_DEVICE_CAPABILITY, 1996 .bDevCapabilityType = USB_SS_CAP_TYPE, 1997 .wSpeedSupported = cpu_to_le16(USB_5GBPS_OPERATION), 1998 .bFunctionalitySupport = ilog2(USB_5GBPS_OPERATION), 1999 }, 2000 }; 2001 2002 static inline void 2003 ss_hub_descriptor(struct usb_hub_descriptor *desc) 2004 { 2005 memset(desc, 0, sizeof *desc); 2006 desc->bDescriptorType = USB_DT_SS_HUB; 2007 desc->bDescLength = 12; 2008 desc->wHubCharacteristics = cpu_to_le16( 2009 HUB_CHAR_INDV_PORT_LPSM | 2010 HUB_CHAR_COMMON_OCPM); 2011 desc->bNbrPorts = 1; 2012 desc->u.ss.bHubHdrDecLat = 0x04; /* Worst case: 0.4 micro sec*/ 2013 desc->u.ss.DeviceRemovable = 0; 2014 } 2015 2016 static inline void hub_descriptor(struct usb_hub_descriptor *desc) 2017 { 2018 memset(desc, 0, sizeof *desc); 2019 desc->bDescriptorType = USB_DT_HUB; 2020 desc->bDescLength = 9; 2021 desc->wHubCharacteristics = cpu_to_le16( 2022 HUB_CHAR_INDV_PORT_LPSM | 2023 HUB_CHAR_COMMON_OCPM); 2024 desc->bNbrPorts = 1; 2025 desc->u.hs.DeviceRemovable[0] = 0; 2026 desc->u.hs.DeviceRemovable[1] = 0xff; /* PortPwrCtrlMask */ 2027 } 2028 2029 static int dummy_hub_control( 2030 struct usb_hcd *hcd, 2031 u16 typeReq, 2032 u16 wValue, 2033 u16 wIndex, 2034 char *buf, 2035 u16 wLength 2036 ) { 2037 struct dummy_hcd *dum_hcd; 2038 int retval = 0; 2039 unsigned long flags; 2040 2041 if (!HCD_HW_ACCESSIBLE(hcd)) 2042 return -ETIMEDOUT; 2043 2044 dum_hcd = hcd_to_dummy_hcd(hcd); 2045 2046 spin_lock_irqsave(&dum_hcd->dum->lock, flags); 2047 switch (typeReq) { 2048 case ClearHubFeature: 2049 break; 2050 case ClearPortFeature: 2051 switch (wValue) { 2052 case USB_PORT_FEAT_SUSPEND: 2053 if (hcd->speed == HCD_USB3) { 2054 dev_dbg(dummy_dev(dum_hcd), 2055 "USB_PORT_FEAT_SUSPEND req not " 2056 "supported for USB 3.0 roothub\n"); 2057 goto error; 2058 } 2059 if (dum_hcd->port_status & USB_PORT_STAT_SUSPEND) { 2060 /* 20msec resume signaling */ 2061 dum_hcd->resuming = 1; 2062 dum_hcd->re_timeout = jiffies + 2063 msecs_to_jiffies(20); 2064 } 2065 break; 2066 case USB_PORT_FEAT_POWER: 2067 dev_dbg(dummy_dev(dum_hcd), "power-off\n"); 2068 if (hcd->speed == HCD_USB3) 2069 dum_hcd->port_status &= ~USB_SS_PORT_STAT_POWER; 2070 else 2071 dum_hcd->port_status &= ~USB_PORT_STAT_POWER; 2072 set_link_state(dum_hcd); 2073 break; 2074 default: 2075 dum_hcd->port_status &= ~(1 << wValue); 2076 set_link_state(dum_hcd); 2077 } 2078 break; 2079 case GetHubDescriptor: 2080 if (hcd->speed == HCD_USB3 && 2081 (wLength < USB_DT_SS_HUB_SIZE || 2082 wValue != (USB_DT_SS_HUB << 8))) { 2083 dev_dbg(dummy_dev(dum_hcd), 2084 "Wrong hub descriptor type for " 2085 "USB 3.0 roothub.\n"); 2086 goto error; 2087 } 2088 if (hcd->speed == HCD_USB3) 2089 ss_hub_descriptor((struct usb_hub_descriptor *) buf); 2090 else 2091 hub_descriptor((struct usb_hub_descriptor *) buf); 2092 break; 2093 2094 case DeviceRequest | USB_REQ_GET_DESCRIPTOR: 2095 if (hcd->speed != HCD_USB3) 2096 goto error; 2097 2098 if ((wValue >> 8) != USB_DT_BOS) 2099 goto error; 2100 2101 memcpy(buf, &usb3_bos_desc, sizeof(usb3_bos_desc)); 2102 retval = sizeof(usb3_bos_desc); 2103 break; 2104 2105 case GetHubStatus: 2106 *(__le32 *) buf = cpu_to_le32(0); 2107 break; 2108 case GetPortStatus: 2109 if (wIndex != 1) 2110 retval = -EPIPE; 2111 2112 /* whoever resets or resumes must GetPortStatus to 2113 * complete it!! 2114 */ 2115 if (dum_hcd->resuming && 2116 time_after_eq(jiffies, dum_hcd->re_timeout)) { 2117 dum_hcd->port_status |= (USB_PORT_STAT_C_SUSPEND << 16); 2118 dum_hcd->port_status &= ~USB_PORT_STAT_SUSPEND; 2119 } 2120 if ((dum_hcd->port_status & USB_PORT_STAT_RESET) != 0 && 2121 time_after_eq(jiffies, dum_hcd->re_timeout)) { 2122 dum_hcd->port_status |= (USB_PORT_STAT_C_RESET << 16); 2123 dum_hcd->port_status &= ~USB_PORT_STAT_RESET; 2124 if (dum_hcd->dum->pullup) { 2125 dum_hcd->port_status |= USB_PORT_STAT_ENABLE; 2126 2127 if (hcd->speed < HCD_USB3) { 2128 switch (dum_hcd->dum->gadget.speed) { 2129 case USB_SPEED_HIGH: 2130 dum_hcd->port_status |= 2131 USB_PORT_STAT_HIGH_SPEED; 2132 break; 2133 case USB_SPEED_LOW: 2134 dum_hcd->dum->gadget.ep0-> 2135 maxpacket = 8; 2136 dum_hcd->port_status |= 2137 USB_PORT_STAT_LOW_SPEED; 2138 break; 2139 default: 2140 dum_hcd->dum->gadget.speed = 2141 USB_SPEED_FULL; 2142 break; 2143 } 2144 } 2145 } 2146 } 2147 set_link_state(dum_hcd); 2148 ((__le16 *) buf)[0] = cpu_to_le16(dum_hcd->port_status); 2149 ((__le16 *) buf)[1] = cpu_to_le16(dum_hcd->port_status >> 16); 2150 break; 2151 case SetHubFeature: 2152 retval = -EPIPE; 2153 break; 2154 case SetPortFeature: 2155 switch (wValue) { 2156 case USB_PORT_FEAT_LINK_STATE: 2157 if (hcd->speed != HCD_USB3) { 2158 dev_dbg(dummy_dev(dum_hcd), 2159 "USB_PORT_FEAT_LINK_STATE req not " 2160 "supported for USB 2.0 roothub\n"); 2161 goto error; 2162 } 2163 /* 2164 * Since this is dummy we don't have an actual link so 2165 * there is nothing to do for the SET_LINK_STATE cmd 2166 */ 2167 break; 2168 case USB_PORT_FEAT_U1_TIMEOUT: 2169 case USB_PORT_FEAT_U2_TIMEOUT: 2170 /* TODO: add suspend/resume support! */ 2171 if (hcd->speed != HCD_USB3) { 2172 dev_dbg(dummy_dev(dum_hcd), 2173 "USB_PORT_FEAT_U1/2_TIMEOUT req not " 2174 "supported for USB 2.0 roothub\n"); 2175 goto error; 2176 } 2177 break; 2178 case USB_PORT_FEAT_SUSPEND: 2179 /* Applicable only for USB2.0 hub */ 2180 if (hcd->speed == HCD_USB3) { 2181 dev_dbg(dummy_dev(dum_hcd), 2182 "USB_PORT_FEAT_SUSPEND req not " 2183 "supported for USB 3.0 roothub\n"); 2184 goto error; 2185 } 2186 if (dum_hcd->active) { 2187 dum_hcd->port_status |= USB_PORT_STAT_SUSPEND; 2188 2189 /* HNP would happen here; for now we 2190 * assume b_bus_req is always true. 2191 */ 2192 set_link_state(dum_hcd); 2193 if (((1 << USB_DEVICE_B_HNP_ENABLE) 2194 & dum_hcd->dum->devstatus) != 0) 2195 dev_dbg(dummy_dev(dum_hcd), 2196 "no HNP yet!\n"); 2197 } 2198 break; 2199 case USB_PORT_FEAT_POWER: 2200 if (hcd->speed == HCD_USB3) 2201 dum_hcd->port_status |= USB_SS_PORT_STAT_POWER; 2202 else 2203 dum_hcd->port_status |= USB_PORT_STAT_POWER; 2204 set_link_state(dum_hcd); 2205 break; 2206 case USB_PORT_FEAT_BH_PORT_RESET: 2207 /* Applicable only for USB3.0 hub */ 2208 if (hcd->speed != HCD_USB3) { 2209 dev_dbg(dummy_dev(dum_hcd), 2210 "USB_PORT_FEAT_BH_PORT_RESET req not " 2211 "supported for USB 2.0 roothub\n"); 2212 goto error; 2213 } 2214 /* FALLS THROUGH */ 2215 case USB_PORT_FEAT_RESET: 2216 /* if it's already enabled, disable */ 2217 if (hcd->speed == HCD_USB3) { 2218 dum_hcd->port_status = 0; 2219 dum_hcd->port_status = 2220 (USB_SS_PORT_STAT_POWER | 2221 USB_PORT_STAT_CONNECTION | 2222 USB_PORT_STAT_RESET); 2223 } else 2224 dum_hcd->port_status &= ~(USB_PORT_STAT_ENABLE 2225 | USB_PORT_STAT_LOW_SPEED 2226 | USB_PORT_STAT_HIGH_SPEED); 2227 /* 2228 * We want to reset device status. All but the 2229 * Self powered feature 2230 */ 2231 dum_hcd->dum->devstatus &= 2232 (1 << USB_DEVICE_SELF_POWERED); 2233 /* 2234 * FIXME USB3.0: what is the correct reset signaling 2235 * interval? Is it still 50msec as for HS? 2236 */ 2237 dum_hcd->re_timeout = jiffies + msecs_to_jiffies(50); 2238 /* FALLS THROUGH */ 2239 default: 2240 if (hcd->speed == HCD_USB3) { 2241 if ((dum_hcd->port_status & 2242 USB_SS_PORT_STAT_POWER) != 0) { 2243 dum_hcd->port_status |= (1 << wValue); 2244 } 2245 } else 2246 if ((dum_hcd->port_status & 2247 USB_PORT_STAT_POWER) != 0) { 2248 dum_hcd->port_status |= (1 << wValue); 2249 } 2250 set_link_state(dum_hcd); 2251 } 2252 break; 2253 case GetPortErrorCount: 2254 if (hcd->speed != HCD_USB3) { 2255 dev_dbg(dummy_dev(dum_hcd), 2256 "GetPortErrorCount req not " 2257 "supported for USB 2.0 roothub\n"); 2258 goto error; 2259 } 2260 /* We'll always return 0 since this is a dummy hub */ 2261 *(__le32 *) buf = cpu_to_le32(0); 2262 break; 2263 case SetHubDepth: 2264 if (hcd->speed != HCD_USB3) { 2265 dev_dbg(dummy_dev(dum_hcd), 2266 "SetHubDepth req not supported for " 2267 "USB 2.0 roothub\n"); 2268 goto error; 2269 } 2270 break; 2271 default: 2272 dev_dbg(dummy_dev(dum_hcd), 2273 "hub control req%04x v%04x i%04x l%d\n", 2274 typeReq, wValue, wIndex, wLength); 2275 error: 2276 /* "protocol stall" on error */ 2277 retval = -EPIPE; 2278 } 2279 spin_unlock_irqrestore(&dum_hcd->dum->lock, flags); 2280 2281 if ((dum_hcd->port_status & PORT_C_MASK) != 0) 2282 usb_hcd_poll_rh_status(hcd); 2283 return retval; 2284 } 2285 2286 static int dummy_bus_suspend(struct usb_hcd *hcd) 2287 { 2288 struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd); 2289 2290 dev_dbg(&hcd->self.root_hub->dev, "%s\n", __func__); 2291 2292 spin_lock_irq(&dum_hcd->dum->lock); 2293 dum_hcd->rh_state = DUMMY_RH_SUSPENDED; 2294 set_link_state(dum_hcd); 2295 hcd->state = HC_STATE_SUSPENDED; 2296 spin_unlock_irq(&dum_hcd->dum->lock); 2297 return 0; 2298 } 2299 2300 static int dummy_bus_resume(struct usb_hcd *hcd) 2301 { 2302 struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd); 2303 int rc = 0; 2304 2305 dev_dbg(&hcd->self.root_hub->dev, "%s\n", __func__); 2306 2307 spin_lock_irq(&dum_hcd->dum->lock); 2308 if (!HCD_HW_ACCESSIBLE(hcd)) { 2309 rc = -ESHUTDOWN; 2310 } else { 2311 dum_hcd->rh_state = DUMMY_RH_RUNNING; 2312 set_link_state(dum_hcd); 2313 if (!list_empty(&dum_hcd->urbp_list)) 2314 mod_timer(&dum_hcd->timer, jiffies); 2315 hcd->state = HC_STATE_RUNNING; 2316 } 2317 spin_unlock_irq(&dum_hcd->dum->lock); 2318 return rc; 2319 } 2320 2321 /*-------------------------------------------------------------------------*/ 2322 2323 static inline ssize_t show_urb(char *buf, size_t size, struct urb *urb) 2324 { 2325 int ep = usb_pipeendpoint(urb->pipe); 2326 2327 return snprintf(buf, size, 2328 "urb/%p %s ep%d%s%s len %d/%d\n", 2329 urb, 2330 ({ char *s; 2331 switch (urb->dev->speed) { 2332 case USB_SPEED_LOW: 2333 s = "ls"; 2334 break; 2335 case USB_SPEED_FULL: 2336 s = "fs"; 2337 break; 2338 case USB_SPEED_HIGH: 2339 s = "hs"; 2340 break; 2341 case USB_SPEED_SUPER: 2342 s = "ss"; 2343 break; 2344 default: 2345 s = "?"; 2346 break; 2347 } s; }), 2348 ep, ep ? (usb_pipein(urb->pipe) ? "in" : "out") : "", 2349 ({ char *s; \ 2350 switch (usb_pipetype(urb->pipe)) { \ 2351 case PIPE_CONTROL: \ 2352 s = ""; \ 2353 break; \ 2354 case PIPE_BULK: \ 2355 s = "-bulk"; \ 2356 break; \ 2357 case PIPE_INTERRUPT: \ 2358 s = "-int"; \ 2359 break; \ 2360 default: \ 2361 s = "-iso"; \ 2362 break; \ 2363 } s; }), 2364 urb->actual_length, urb->transfer_buffer_length); 2365 } 2366 2367 static ssize_t urbs_show(struct device *dev, struct device_attribute *attr, 2368 char *buf) 2369 { 2370 struct usb_hcd *hcd = dev_get_drvdata(dev); 2371 struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd); 2372 struct urbp *urbp; 2373 size_t size = 0; 2374 unsigned long flags; 2375 2376 spin_lock_irqsave(&dum_hcd->dum->lock, flags); 2377 list_for_each_entry(urbp, &dum_hcd->urbp_list, urbp_list) { 2378 size_t temp; 2379 2380 temp = show_urb(buf, PAGE_SIZE - size, urbp->urb); 2381 buf += temp; 2382 size += temp; 2383 } 2384 spin_unlock_irqrestore(&dum_hcd->dum->lock, flags); 2385 2386 return size; 2387 } 2388 static DEVICE_ATTR_RO(urbs); 2389 2390 static int dummy_start_ss(struct dummy_hcd *dum_hcd) 2391 { 2392 init_timer(&dum_hcd->timer); 2393 dum_hcd->timer.function = dummy_timer; 2394 dum_hcd->timer.data = (unsigned long)dum_hcd; 2395 dum_hcd->rh_state = DUMMY_RH_RUNNING; 2396 dum_hcd->stream_en_ep = 0; 2397 INIT_LIST_HEAD(&dum_hcd->urbp_list); 2398 dummy_hcd_to_hcd(dum_hcd)->power_budget = POWER_BUDGET; 2399 dummy_hcd_to_hcd(dum_hcd)->state = HC_STATE_RUNNING; 2400 dummy_hcd_to_hcd(dum_hcd)->uses_new_polling = 1; 2401 #ifdef CONFIG_USB_OTG 2402 dummy_hcd_to_hcd(dum_hcd)->self.otg_port = 1; 2403 #endif 2404 return 0; 2405 2406 /* FIXME 'urbs' should be a per-device thing, maybe in usbcore */ 2407 return device_create_file(dummy_dev(dum_hcd), &dev_attr_urbs); 2408 } 2409 2410 static int dummy_start(struct usb_hcd *hcd) 2411 { 2412 struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd); 2413 2414 /* 2415 * MASTER side init ... we emulate a root hub that'll only ever 2416 * talk to one device (the slave side). Also appears in sysfs, 2417 * just like more familiar pci-based HCDs. 2418 */ 2419 if (!usb_hcd_is_primary_hcd(hcd)) 2420 return dummy_start_ss(dum_hcd); 2421 2422 spin_lock_init(&dum_hcd->dum->lock); 2423 init_timer(&dum_hcd->timer); 2424 dum_hcd->timer.function = dummy_timer; 2425 dum_hcd->timer.data = (unsigned long)dum_hcd; 2426 dum_hcd->rh_state = DUMMY_RH_RUNNING; 2427 2428 INIT_LIST_HEAD(&dum_hcd->urbp_list); 2429 2430 hcd->power_budget = POWER_BUDGET; 2431 hcd->state = HC_STATE_RUNNING; 2432 hcd->uses_new_polling = 1; 2433 2434 #ifdef CONFIG_USB_OTG 2435 hcd->self.otg_port = 1; 2436 #endif 2437 2438 /* FIXME 'urbs' should be a per-device thing, maybe in usbcore */ 2439 return device_create_file(dummy_dev(dum_hcd), &dev_attr_urbs); 2440 } 2441 2442 static void dummy_stop(struct usb_hcd *hcd) 2443 { 2444 device_remove_file(dummy_dev(hcd_to_dummy_hcd(hcd)), &dev_attr_urbs); 2445 dev_info(dummy_dev(hcd_to_dummy_hcd(hcd)), "stopped\n"); 2446 } 2447 2448 /*-------------------------------------------------------------------------*/ 2449 2450 static int dummy_h_get_frame(struct usb_hcd *hcd) 2451 { 2452 return dummy_g_get_frame(NULL); 2453 } 2454 2455 static int dummy_setup(struct usb_hcd *hcd) 2456 { 2457 struct dummy *dum; 2458 2459 dum = *((void **)dev_get_platdata(hcd->self.controller)); 2460 hcd->self.sg_tablesize = ~0; 2461 if (usb_hcd_is_primary_hcd(hcd)) { 2462 dum->hs_hcd = hcd_to_dummy_hcd(hcd); 2463 dum->hs_hcd->dum = dum; 2464 /* 2465 * Mark the first roothub as being USB 2.0. 2466 * The USB 3.0 roothub will be registered later by 2467 * dummy_hcd_probe() 2468 */ 2469 hcd->speed = HCD_USB2; 2470 hcd->self.root_hub->speed = USB_SPEED_HIGH; 2471 } else { 2472 dum->ss_hcd = hcd_to_dummy_hcd(hcd); 2473 dum->ss_hcd->dum = dum; 2474 hcd->speed = HCD_USB3; 2475 hcd->self.root_hub->speed = USB_SPEED_SUPER; 2476 } 2477 return 0; 2478 } 2479 2480 /* Change a group of bulk endpoints to support multiple stream IDs */ 2481 static int dummy_alloc_streams(struct usb_hcd *hcd, struct usb_device *udev, 2482 struct usb_host_endpoint **eps, unsigned int num_eps, 2483 unsigned int num_streams, gfp_t mem_flags) 2484 { 2485 struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd); 2486 unsigned long flags; 2487 int max_stream; 2488 int ret_streams = num_streams; 2489 unsigned int index; 2490 unsigned int i; 2491 2492 if (!num_eps) 2493 return -EINVAL; 2494 2495 spin_lock_irqsave(&dum_hcd->dum->lock, flags); 2496 for (i = 0; i < num_eps; i++) { 2497 index = dummy_get_ep_idx(&eps[i]->desc); 2498 if ((1 << index) & dum_hcd->stream_en_ep) { 2499 ret_streams = -EINVAL; 2500 goto out; 2501 } 2502 max_stream = usb_ss_max_streams(&eps[i]->ss_ep_comp); 2503 if (!max_stream) { 2504 ret_streams = -EINVAL; 2505 goto out; 2506 } 2507 if (max_stream < ret_streams) { 2508 dev_dbg(dummy_dev(dum_hcd), "Ep 0x%x only supports %u " 2509 "stream IDs.\n", 2510 eps[i]->desc.bEndpointAddress, 2511 max_stream); 2512 ret_streams = max_stream; 2513 } 2514 } 2515 2516 for (i = 0; i < num_eps; i++) { 2517 index = dummy_get_ep_idx(&eps[i]->desc); 2518 dum_hcd->stream_en_ep |= 1 << index; 2519 set_max_streams_for_pipe(dum_hcd, 2520 usb_endpoint_num(&eps[i]->desc), ret_streams); 2521 } 2522 out: 2523 spin_unlock_irqrestore(&dum_hcd->dum->lock, flags); 2524 return ret_streams; 2525 } 2526 2527 /* Reverts a group of bulk endpoints back to not using stream IDs. */ 2528 static int dummy_free_streams(struct usb_hcd *hcd, struct usb_device *udev, 2529 struct usb_host_endpoint **eps, unsigned int num_eps, 2530 gfp_t mem_flags) 2531 { 2532 struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd); 2533 unsigned long flags; 2534 int ret; 2535 unsigned int index; 2536 unsigned int i; 2537 2538 spin_lock_irqsave(&dum_hcd->dum->lock, flags); 2539 for (i = 0; i < num_eps; i++) { 2540 index = dummy_get_ep_idx(&eps[i]->desc); 2541 if (!((1 << index) & dum_hcd->stream_en_ep)) { 2542 ret = -EINVAL; 2543 goto out; 2544 } 2545 } 2546 2547 for (i = 0; i < num_eps; i++) { 2548 index = dummy_get_ep_idx(&eps[i]->desc); 2549 dum_hcd->stream_en_ep &= ~(1 << index); 2550 set_max_streams_for_pipe(dum_hcd, 2551 usb_endpoint_num(&eps[i]->desc), 0); 2552 } 2553 ret = 0; 2554 out: 2555 spin_unlock_irqrestore(&dum_hcd->dum->lock, flags); 2556 return ret; 2557 } 2558 2559 static struct hc_driver dummy_hcd = { 2560 .description = (char *) driver_name, 2561 .product_desc = "Dummy host controller", 2562 .hcd_priv_size = sizeof(struct dummy_hcd), 2563 2564 .flags = HCD_USB3 | HCD_SHARED, 2565 2566 .reset = dummy_setup, 2567 .start = dummy_start, 2568 .stop = dummy_stop, 2569 2570 .urb_enqueue = dummy_urb_enqueue, 2571 .urb_dequeue = dummy_urb_dequeue, 2572 2573 .get_frame_number = dummy_h_get_frame, 2574 2575 .hub_status_data = dummy_hub_status, 2576 .hub_control = dummy_hub_control, 2577 .bus_suspend = dummy_bus_suspend, 2578 .bus_resume = dummy_bus_resume, 2579 2580 .alloc_streams = dummy_alloc_streams, 2581 .free_streams = dummy_free_streams, 2582 }; 2583 2584 static int dummy_hcd_probe(struct platform_device *pdev) 2585 { 2586 struct dummy *dum; 2587 struct usb_hcd *hs_hcd; 2588 struct usb_hcd *ss_hcd; 2589 int retval; 2590 2591 dev_info(&pdev->dev, "%s, driver " DRIVER_VERSION "\n", driver_desc); 2592 dum = *((void **)dev_get_platdata(&pdev->dev)); 2593 2594 if (!mod_data.is_super_speed) 2595 dummy_hcd.flags = HCD_USB2; 2596 hs_hcd = usb_create_hcd(&dummy_hcd, &pdev->dev, dev_name(&pdev->dev)); 2597 if (!hs_hcd) 2598 return -ENOMEM; 2599 hs_hcd->has_tt = 1; 2600 2601 retval = usb_add_hcd(hs_hcd, 0, 0); 2602 if (retval) 2603 goto put_usb2_hcd; 2604 2605 if (mod_data.is_super_speed) { 2606 ss_hcd = usb_create_shared_hcd(&dummy_hcd, &pdev->dev, 2607 dev_name(&pdev->dev), hs_hcd); 2608 if (!ss_hcd) { 2609 retval = -ENOMEM; 2610 goto dealloc_usb2_hcd; 2611 } 2612 2613 retval = usb_add_hcd(ss_hcd, 0, 0); 2614 if (retval) 2615 goto put_usb3_hcd; 2616 } 2617 return 0; 2618 2619 put_usb3_hcd: 2620 usb_put_hcd(ss_hcd); 2621 dealloc_usb2_hcd: 2622 usb_remove_hcd(hs_hcd); 2623 put_usb2_hcd: 2624 usb_put_hcd(hs_hcd); 2625 dum->hs_hcd = dum->ss_hcd = NULL; 2626 return retval; 2627 } 2628 2629 static int dummy_hcd_remove(struct platform_device *pdev) 2630 { 2631 struct dummy *dum; 2632 2633 dum = hcd_to_dummy_hcd(platform_get_drvdata(pdev))->dum; 2634 2635 if (dum->ss_hcd) { 2636 usb_remove_hcd(dummy_hcd_to_hcd(dum->ss_hcd)); 2637 usb_put_hcd(dummy_hcd_to_hcd(dum->ss_hcd)); 2638 } 2639 2640 usb_remove_hcd(dummy_hcd_to_hcd(dum->hs_hcd)); 2641 usb_put_hcd(dummy_hcd_to_hcd(dum->hs_hcd)); 2642 2643 dum->hs_hcd = NULL; 2644 dum->ss_hcd = NULL; 2645 2646 return 0; 2647 } 2648 2649 static int dummy_hcd_suspend(struct platform_device *pdev, pm_message_t state) 2650 { 2651 struct usb_hcd *hcd; 2652 struct dummy_hcd *dum_hcd; 2653 int rc = 0; 2654 2655 dev_dbg(&pdev->dev, "%s\n", __func__); 2656 2657 hcd = platform_get_drvdata(pdev); 2658 dum_hcd = hcd_to_dummy_hcd(hcd); 2659 if (dum_hcd->rh_state == DUMMY_RH_RUNNING) { 2660 dev_warn(&pdev->dev, "Root hub isn't suspended!\n"); 2661 rc = -EBUSY; 2662 } else 2663 clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags); 2664 return rc; 2665 } 2666 2667 static int dummy_hcd_resume(struct platform_device *pdev) 2668 { 2669 struct usb_hcd *hcd; 2670 2671 dev_dbg(&pdev->dev, "%s\n", __func__); 2672 2673 hcd = platform_get_drvdata(pdev); 2674 set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags); 2675 usb_hcd_poll_rh_status(hcd); 2676 return 0; 2677 } 2678 2679 static struct platform_driver dummy_hcd_driver = { 2680 .probe = dummy_hcd_probe, 2681 .remove = dummy_hcd_remove, 2682 .suspend = dummy_hcd_suspend, 2683 .resume = dummy_hcd_resume, 2684 .driver = { 2685 .name = (char *) driver_name, 2686 }, 2687 }; 2688 2689 /*-------------------------------------------------------------------------*/ 2690 #define MAX_NUM_UDC 2 2691 static struct platform_device *the_udc_pdev[MAX_NUM_UDC]; 2692 static struct platform_device *the_hcd_pdev[MAX_NUM_UDC]; 2693 2694 static int __init init(void) 2695 { 2696 int retval = -ENOMEM; 2697 int i; 2698 struct dummy *dum[MAX_NUM_UDC]; 2699 2700 if (usb_disabled()) 2701 return -ENODEV; 2702 2703 if (!mod_data.is_high_speed && mod_data.is_super_speed) 2704 return -EINVAL; 2705 2706 if (mod_data.num < 1 || mod_data.num > MAX_NUM_UDC) { 2707 pr_err("Number of emulated UDC must be in range of 1...%d\n", 2708 MAX_NUM_UDC); 2709 return -EINVAL; 2710 } 2711 2712 for (i = 0; i < mod_data.num; i++) { 2713 the_hcd_pdev[i] = platform_device_alloc(driver_name, i); 2714 if (!the_hcd_pdev[i]) { 2715 i--; 2716 while (i >= 0) 2717 platform_device_put(the_hcd_pdev[i--]); 2718 return retval; 2719 } 2720 } 2721 for (i = 0; i < mod_data.num; i++) { 2722 the_udc_pdev[i] = platform_device_alloc(gadget_name, i); 2723 if (!the_udc_pdev[i]) { 2724 i--; 2725 while (i >= 0) 2726 platform_device_put(the_udc_pdev[i--]); 2727 goto err_alloc_udc; 2728 } 2729 } 2730 for (i = 0; i < mod_data.num; i++) { 2731 dum[i] = kzalloc(sizeof(struct dummy), GFP_KERNEL); 2732 if (!dum[i]) { 2733 retval = -ENOMEM; 2734 goto err_add_pdata; 2735 } 2736 retval = platform_device_add_data(the_hcd_pdev[i], &dum[i], 2737 sizeof(void *)); 2738 if (retval) 2739 goto err_add_pdata; 2740 retval = platform_device_add_data(the_udc_pdev[i], &dum[i], 2741 sizeof(void *)); 2742 if (retval) 2743 goto err_add_pdata; 2744 } 2745 2746 retval = platform_driver_register(&dummy_hcd_driver); 2747 if (retval < 0) 2748 goto err_add_pdata; 2749 retval = platform_driver_register(&dummy_udc_driver); 2750 if (retval < 0) 2751 goto err_register_udc_driver; 2752 2753 for (i = 0; i < mod_data.num; i++) { 2754 retval = platform_device_add(the_hcd_pdev[i]); 2755 if (retval < 0) { 2756 i--; 2757 while (i >= 0) 2758 platform_device_del(the_hcd_pdev[i--]); 2759 goto err_add_hcd; 2760 } 2761 } 2762 for (i = 0; i < mod_data.num; i++) { 2763 if (!dum[i]->hs_hcd || 2764 (!dum[i]->ss_hcd && mod_data.is_super_speed)) { 2765 /* 2766 * The hcd was added successfully but its probe 2767 * function failed for some reason. 2768 */ 2769 retval = -EINVAL; 2770 goto err_add_udc; 2771 } 2772 } 2773 2774 for (i = 0; i < mod_data.num; i++) { 2775 retval = platform_device_add(the_udc_pdev[i]); 2776 if (retval < 0) { 2777 i--; 2778 while (i >= 0) 2779 platform_device_del(the_udc_pdev[i]); 2780 goto err_add_udc; 2781 } 2782 } 2783 2784 for (i = 0; i < mod_data.num; i++) { 2785 if (!platform_get_drvdata(the_udc_pdev[i])) { 2786 /* 2787 * The udc was added successfully but its probe 2788 * function failed for some reason. 2789 */ 2790 retval = -EINVAL; 2791 goto err_probe_udc; 2792 } 2793 } 2794 return retval; 2795 2796 err_probe_udc: 2797 for (i = 0; i < mod_data.num; i++) 2798 platform_device_del(the_udc_pdev[i]); 2799 err_add_udc: 2800 for (i = 0; i < mod_data.num; i++) 2801 platform_device_del(the_hcd_pdev[i]); 2802 err_add_hcd: 2803 platform_driver_unregister(&dummy_udc_driver); 2804 err_register_udc_driver: 2805 platform_driver_unregister(&dummy_hcd_driver); 2806 err_add_pdata: 2807 for (i = 0; i < mod_data.num; i++) 2808 kfree(dum[i]); 2809 for (i = 0; i < mod_data.num; i++) 2810 platform_device_put(the_udc_pdev[i]); 2811 err_alloc_udc: 2812 for (i = 0; i < mod_data.num; i++) 2813 platform_device_put(the_hcd_pdev[i]); 2814 return retval; 2815 } 2816 module_init(init); 2817 2818 static void __exit cleanup(void) 2819 { 2820 int i; 2821 2822 for (i = 0; i < mod_data.num; i++) { 2823 struct dummy *dum; 2824 2825 dum = *((void **)dev_get_platdata(&the_udc_pdev[i]->dev)); 2826 2827 platform_device_unregister(the_udc_pdev[i]); 2828 platform_device_unregister(the_hcd_pdev[i]); 2829 kfree(dum); 2830 } 2831 platform_driver_unregister(&dummy_udc_driver); 2832 platform_driver_unregister(&dummy_hcd_driver); 2833 } 2834 module_exit(cleanup); 2835