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 struct dummy_ep *ep; 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 list_for_each_entry(ep, &dum->gadget.ep_list, ep.ep_list) 342 nuke(dum, ep); 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 spin_unlock(&dum->lock); 446 if (reset) 447 usb_gadget_udc_reset(&dum->gadget, dum->driver); 448 else 449 dum->driver->disconnect(&dum->gadget); 450 spin_lock(&dum->lock); 451 } 452 } else if (dum_hcd->active != dum_hcd->old_active) { 453 if (dum_hcd->old_active && dum->driver->suspend) { 454 spin_unlock(&dum->lock); 455 dum->driver->suspend(&dum->gadget); 456 spin_lock(&dum->lock); 457 } else if (!dum_hcd->old_active && dum->driver->resume) { 458 spin_unlock(&dum->lock); 459 dum->driver->resume(&dum->gadget); 460 spin_lock(&dum->lock); 461 } 462 } 463 464 dum_hcd->old_status = dum_hcd->port_status; 465 dum_hcd->old_active = dum_hcd->active; 466 } 467 468 /*-------------------------------------------------------------------------*/ 469 470 /* SLAVE/GADGET SIDE DRIVER 471 * 472 * This only tracks gadget state. All the work is done when the host 473 * side tries some (emulated) i/o operation. Real device controller 474 * drivers would do real i/o using dma, fifos, irqs, timers, etc. 475 */ 476 477 #define is_enabled(dum) \ 478 (dum->port_status & USB_PORT_STAT_ENABLE) 479 480 static int dummy_enable(struct usb_ep *_ep, 481 const struct usb_endpoint_descriptor *desc) 482 { 483 struct dummy *dum; 484 struct dummy_hcd *dum_hcd; 485 struct dummy_ep *ep; 486 unsigned max; 487 int retval; 488 489 ep = usb_ep_to_dummy_ep(_ep); 490 if (!_ep || !desc || ep->desc || _ep->name == ep0name 491 || desc->bDescriptorType != USB_DT_ENDPOINT) 492 return -EINVAL; 493 dum = ep_to_dummy(ep); 494 if (!dum->driver) 495 return -ESHUTDOWN; 496 497 dum_hcd = gadget_to_dummy_hcd(&dum->gadget); 498 if (!is_enabled(dum_hcd)) 499 return -ESHUTDOWN; 500 501 /* 502 * For HS/FS devices only bits 0..10 of the wMaxPacketSize represent the 503 * maximum packet size. 504 * For SS devices the wMaxPacketSize is limited by 1024. 505 */ 506 max = usb_endpoint_maxp(desc) & 0x7ff; 507 508 /* drivers must not request bad settings, since lower levels 509 * (hardware or its drivers) may not check. some endpoints 510 * can't do iso, many have maxpacket limitations, etc. 511 * 512 * since this "hardware" driver is here to help debugging, we 513 * have some extra sanity checks. (there could be more though, 514 * especially for "ep9out" style fixed function ones.) 515 */ 516 retval = -EINVAL; 517 switch (usb_endpoint_type(desc)) { 518 case USB_ENDPOINT_XFER_BULK: 519 if (strstr(ep->ep.name, "-iso") 520 || strstr(ep->ep.name, "-int")) { 521 goto done; 522 } 523 switch (dum->gadget.speed) { 524 case USB_SPEED_SUPER: 525 if (max == 1024) 526 break; 527 goto done; 528 case USB_SPEED_HIGH: 529 if (max == 512) 530 break; 531 goto done; 532 case USB_SPEED_FULL: 533 if (max == 8 || max == 16 || max == 32 || max == 64) 534 /* we'll fake any legal size */ 535 break; 536 /* save a return statement */ 537 default: 538 goto done; 539 } 540 break; 541 case USB_ENDPOINT_XFER_INT: 542 if (strstr(ep->ep.name, "-iso")) /* bulk is ok */ 543 goto done; 544 /* real hardware might not handle all packet sizes */ 545 switch (dum->gadget.speed) { 546 case USB_SPEED_SUPER: 547 case USB_SPEED_HIGH: 548 if (max <= 1024) 549 break; 550 /* save a return statement */ 551 case USB_SPEED_FULL: 552 if (max <= 64) 553 break; 554 /* save a return statement */ 555 default: 556 if (max <= 8) 557 break; 558 goto done; 559 } 560 break; 561 case USB_ENDPOINT_XFER_ISOC: 562 if (strstr(ep->ep.name, "-bulk") 563 || strstr(ep->ep.name, "-int")) 564 goto done; 565 /* real hardware might not handle all packet sizes */ 566 switch (dum->gadget.speed) { 567 case USB_SPEED_SUPER: 568 case USB_SPEED_HIGH: 569 if (max <= 1024) 570 break; 571 /* save a return statement */ 572 case USB_SPEED_FULL: 573 if (max <= 1023) 574 break; 575 /* save a return statement */ 576 default: 577 goto done; 578 } 579 break; 580 default: 581 /* few chips support control except on ep0 */ 582 goto done; 583 } 584 585 _ep->maxpacket = max; 586 if (usb_ss_max_streams(_ep->comp_desc)) { 587 if (!usb_endpoint_xfer_bulk(desc)) { 588 dev_err(udc_dev(dum), "Can't enable stream support on " 589 "non-bulk ep %s\n", _ep->name); 590 return -EINVAL; 591 } 592 ep->stream_en = 1; 593 } 594 ep->desc = desc; 595 596 dev_dbg(udc_dev(dum), "enabled %s (ep%d%s-%s) maxpacket %d stream %s\n", 597 _ep->name, 598 desc->bEndpointAddress & 0x0f, 599 (desc->bEndpointAddress & USB_DIR_IN) ? "in" : "out", 600 ({ char *val; 601 switch (usb_endpoint_type(desc)) { 602 case USB_ENDPOINT_XFER_BULK: 603 val = "bulk"; 604 break; 605 case USB_ENDPOINT_XFER_ISOC: 606 val = "iso"; 607 break; 608 case USB_ENDPOINT_XFER_INT: 609 val = "intr"; 610 break; 611 default: 612 val = "ctrl"; 613 break; 614 } val; }), 615 max, ep->stream_en ? "enabled" : "disabled"); 616 617 /* at this point real hardware should be NAKing transfers 618 * to that endpoint, until a buffer is queued to it. 619 */ 620 ep->halted = ep->wedged = 0; 621 retval = 0; 622 done: 623 return retval; 624 } 625 626 static int dummy_disable(struct usb_ep *_ep) 627 { 628 struct dummy_ep *ep; 629 struct dummy *dum; 630 unsigned long flags; 631 632 ep = usb_ep_to_dummy_ep(_ep); 633 if (!_ep || !ep->desc || _ep->name == ep0name) 634 return -EINVAL; 635 dum = ep_to_dummy(ep); 636 637 spin_lock_irqsave(&dum->lock, flags); 638 ep->desc = NULL; 639 ep->stream_en = 0; 640 nuke(dum, ep); 641 spin_unlock_irqrestore(&dum->lock, flags); 642 643 dev_dbg(udc_dev(dum), "disabled %s\n", _ep->name); 644 return 0; 645 } 646 647 static struct usb_request *dummy_alloc_request(struct usb_ep *_ep, 648 gfp_t mem_flags) 649 { 650 struct dummy_ep *ep; 651 struct dummy_request *req; 652 653 if (!_ep) 654 return NULL; 655 ep = usb_ep_to_dummy_ep(_ep); 656 657 req = kzalloc(sizeof(*req), mem_flags); 658 if (!req) 659 return NULL; 660 INIT_LIST_HEAD(&req->queue); 661 return &req->req; 662 } 663 664 static void dummy_free_request(struct usb_ep *_ep, struct usb_request *_req) 665 { 666 struct dummy_request *req; 667 668 if (!_ep || !_req) { 669 WARN_ON(1); 670 return; 671 } 672 673 req = usb_request_to_dummy_request(_req); 674 WARN_ON(!list_empty(&req->queue)); 675 kfree(req); 676 } 677 678 static void fifo_complete(struct usb_ep *ep, struct usb_request *req) 679 { 680 } 681 682 static int dummy_queue(struct usb_ep *_ep, struct usb_request *_req, 683 gfp_t mem_flags) 684 { 685 struct dummy_ep *ep; 686 struct dummy_request *req; 687 struct dummy *dum; 688 struct dummy_hcd *dum_hcd; 689 unsigned long flags; 690 691 req = usb_request_to_dummy_request(_req); 692 if (!_req || !list_empty(&req->queue) || !_req->complete) 693 return -EINVAL; 694 695 ep = usb_ep_to_dummy_ep(_ep); 696 if (!_ep || (!ep->desc && _ep->name != ep0name)) 697 return -EINVAL; 698 699 dum = ep_to_dummy(ep); 700 dum_hcd = gadget_to_dummy_hcd(&dum->gadget); 701 if (!dum->driver || !is_enabled(dum_hcd)) 702 return -ESHUTDOWN; 703 704 #if 0 705 dev_dbg(udc_dev(dum), "ep %p queue req %p to %s, len %d buf %p\n", 706 ep, _req, _ep->name, _req->length, _req->buf); 707 #endif 708 _req->status = -EINPROGRESS; 709 _req->actual = 0; 710 spin_lock_irqsave(&dum->lock, flags); 711 712 /* implement an emulated single-request FIFO */ 713 if (ep->desc && (ep->desc->bEndpointAddress & USB_DIR_IN) && 714 list_empty(&dum->fifo_req.queue) && 715 list_empty(&ep->queue) && 716 _req->length <= FIFO_SIZE) { 717 req = &dum->fifo_req; 718 req->req = *_req; 719 req->req.buf = dum->fifo_buf; 720 memcpy(dum->fifo_buf, _req->buf, _req->length); 721 req->req.context = dum; 722 req->req.complete = fifo_complete; 723 724 list_add_tail(&req->queue, &ep->queue); 725 spin_unlock(&dum->lock); 726 _req->actual = _req->length; 727 _req->status = 0; 728 usb_gadget_giveback_request(_ep, _req); 729 spin_lock(&dum->lock); 730 } else 731 list_add_tail(&req->queue, &ep->queue); 732 spin_unlock_irqrestore(&dum->lock, flags); 733 734 /* real hardware would likely enable transfers here, in case 735 * it'd been left NAKing. 736 */ 737 return 0; 738 } 739 740 static int dummy_dequeue(struct usb_ep *_ep, struct usb_request *_req) 741 { 742 struct dummy_ep *ep; 743 struct dummy *dum; 744 int retval = -EINVAL; 745 unsigned long flags; 746 struct dummy_request *req = NULL; 747 748 if (!_ep || !_req) 749 return retval; 750 ep = usb_ep_to_dummy_ep(_ep); 751 dum = ep_to_dummy(ep); 752 753 if (!dum->driver) 754 return -ESHUTDOWN; 755 756 local_irq_save(flags); 757 spin_lock(&dum->lock); 758 list_for_each_entry(req, &ep->queue, queue) { 759 if (&req->req == _req) { 760 list_del_init(&req->queue); 761 _req->status = -ECONNRESET; 762 retval = 0; 763 break; 764 } 765 } 766 spin_unlock(&dum->lock); 767 768 if (retval == 0) { 769 dev_dbg(udc_dev(dum), 770 "dequeued req %p from %s, len %d buf %p\n", 771 req, _ep->name, _req->length, _req->buf); 772 usb_gadget_giveback_request(_ep, _req); 773 } 774 local_irq_restore(flags); 775 return retval; 776 } 777 778 static int 779 dummy_set_halt_and_wedge(struct usb_ep *_ep, int value, int wedged) 780 { 781 struct dummy_ep *ep; 782 struct dummy *dum; 783 784 if (!_ep) 785 return -EINVAL; 786 ep = usb_ep_to_dummy_ep(_ep); 787 dum = ep_to_dummy(ep); 788 if (!dum->driver) 789 return -ESHUTDOWN; 790 if (!value) 791 ep->halted = ep->wedged = 0; 792 else if (ep->desc && (ep->desc->bEndpointAddress & USB_DIR_IN) && 793 !list_empty(&ep->queue)) 794 return -EAGAIN; 795 else { 796 ep->halted = 1; 797 if (wedged) 798 ep->wedged = 1; 799 } 800 /* FIXME clear emulated data toggle too */ 801 return 0; 802 } 803 804 static int 805 dummy_set_halt(struct usb_ep *_ep, int value) 806 { 807 return dummy_set_halt_and_wedge(_ep, value, 0); 808 } 809 810 static int dummy_set_wedge(struct usb_ep *_ep) 811 { 812 if (!_ep || _ep->name == ep0name) 813 return -EINVAL; 814 return dummy_set_halt_and_wedge(_ep, 1, 1); 815 } 816 817 static const struct usb_ep_ops dummy_ep_ops = { 818 .enable = dummy_enable, 819 .disable = dummy_disable, 820 821 .alloc_request = dummy_alloc_request, 822 .free_request = dummy_free_request, 823 824 .queue = dummy_queue, 825 .dequeue = dummy_dequeue, 826 827 .set_halt = dummy_set_halt, 828 .set_wedge = dummy_set_wedge, 829 }; 830 831 /*-------------------------------------------------------------------------*/ 832 833 /* there are both host and device side versions of this call ... */ 834 static int dummy_g_get_frame(struct usb_gadget *_gadget) 835 { 836 struct timeval tv; 837 838 do_gettimeofday(&tv); 839 return tv.tv_usec / 1000; 840 } 841 842 static int dummy_wakeup(struct usb_gadget *_gadget) 843 { 844 struct dummy_hcd *dum_hcd; 845 846 dum_hcd = gadget_to_dummy_hcd(_gadget); 847 if (!(dum_hcd->dum->devstatus & ((1 << USB_DEVICE_B_HNP_ENABLE) 848 | (1 << USB_DEVICE_REMOTE_WAKEUP)))) 849 return -EINVAL; 850 if ((dum_hcd->port_status & USB_PORT_STAT_CONNECTION) == 0) 851 return -ENOLINK; 852 if ((dum_hcd->port_status & USB_PORT_STAT_SUSPEND) == 0 && 853 dum_hcd->rh_state != DUMMY_RH_SUSPENDED) 854 return -EIO; 855 856 /* FIXME: What if the root hub is suspended but the port isn't? */ 857 858 /* hub notices our request, issues downstream resume, etc */ 859 dum_hcd->resuming = 1; 860 dum_hcd->re_timeout = jiffies + msecs_to_jiffies(20); 861 mod_timer(&dummy_hcd_to_hcd(dum_hcd)->rh_timer, dum_hcd->re_timeout); 862 return 0; 863 } 864 865 static int dummy_set_selfpowered(struct usb_gadget *_gadget, int value) 866 { 867 struct dummy *dum; 868 869 _gadget->is_selfpowered = (value != 0); 870 dum = gadget_to_dummy_hcd(_gadget)->dum; 871 if (value) 872 dum->devstatus |= (1 << USB_DEVICE_SELF_POWERED); 873 else 874 dum->devstatus &= ~(1 << USB_DEVICE_SELF_POWERED); 875 return 0; 876 } 877 878 static void dummy_udc_update_ep0(struct dummy *dum) 879 { 880 if (dum->gadget.speed == USB_SPEED_SUPER) 881 dum->ep[0].ep.maxpacket = 9; 882 else 883 dum->ep[0].ep.maxpacket = 64; 884 } 885 886 static int dummy_pullup(struct usb_gadget *_gadget, int value) 887 { 888 struct dummy_hcd *dum_hcd; 889 struct dummy *dum; 890 unsigned long flags; 891 892 dum = gadget_dev_to_dummy(&_gadget->dev); 893 894 if (value && dum->driver) { 895 if (mod_data.is_super_speed) 896 dum->gadget.speed = dum->driver->max_speed; 897 else if (mod_data.is_high_speed) 898 dum->gadget.speed = min_t(u8, USB_SPEED_HIGH, 899 dum->driver->max_speed); 900 else 901 dum->gadget.speed = USB_SPEED_FULL; 902 dummy_udc_update_ep0(dum); 903 904 if (dum->gadget.speed < dum->driver->max_speed) 905 dev_dbg(udc_dev(dum), "This device can perform faster" 906 " if you connect it to a %s port...\n", 907 usb_speed_string(dum->driver->max_speed)); 908 } 909 dum_hcd = gadget_to_dummy_hcd(_gadget); 910 911 spin_lock_irqsave(&dum->lock, flags); 912 dum->pullup = (value != 0); 913 set_link_state(dum_hcd); 914 spin_unlock_irqrestore(&dum->lock, flags); 915 916 usb_hcd_poll_rh_status(dummy_hcd_to_hcd(dum_hcd)); 917 return 0; 918 } 919 920 static int dummy_udc_start(struct usb_gadget *g, 921 struct usb_gadget_driver *driver); 922 static int dummy_udc_stop(struct usb_gadget *g); 923 924 static const struct usb_gadget_ops dummy_ops = { 925 .get_frame = dummy_g_get_frame, 926 .wakeup = dummy_wakeup, 927 .set_selfpowered = dummy_set_selfpowered, 928 .pullup = dummy_pullup, 929 .udc_start = dummy_udc_start, 930 .udc_stop = dummy_udc_stop, 931 }; 932 933 /*-------------------------------------------------------------------------*/ 934 935 /* "function" sysfs attribute */ 936 static ssize_t function_show(struct device *dev, struct device_attribute *attr, 937 char *buf) 938 { 939 struct dummy *dum = gadget_dev_to_dummy(dev); 940 941 if (!dum->driver || !dum->driver->function) 942 return 0; 943 return scnprintf(buf, PAGE_SIZE, "%s\n", dum->driver->function); 944 } 945 static DEVICE_ATTR_RO(function); 946 947 /*-------------------------------------------------------------------------*/ 948 949 /* 950 * Driver registration/unregistration. 951 * 952 * This is basically hardware-specific; there's usually only one real USB 953 * device (not host) controller since that's how USB devices are intended 954 * to work. So most implementations of these api calls will rely on the 955 * fact that only one driver will ever bind to the hardware. But curious 956 * hardware can be built with discrete components, so the gadget API doesn't 957 * require that assumption. 958 * 959 * For this emulator, it might be convenient to create a usb slave device 960 * for each driver that registers: just add to a big root hub. 961 */ 962 963 static int dummy_udc_start(struct usb_gadget *g, 964 struct usb_gadget_driver *driver) 965 { 966 struct dummy_hcd *dum_hcd = gadget_to_dummy_hcd(g); 967 struct dummy *dum = dum_hcd->dum; 968 969 if (driver->max_speed == USB_SPEED_UNKNOWN) 970 return -EINVAL; 971 972 /* 973 * SLAVE side init ... the layer above hardware, which 974 * can't enumerate without help from the driver we're binding. 975 */ 976 977 dum->devstatus = 0; 978 dum->driver = driver; 979 980 return 0; 981 } 982 983 static int dummy_udc_stop(struct usb_gadget *g) 984 { 985 struct dummy_hcd *dum_hcd = gadget_to_dummy_hcd(g); 986 struct dummy *dum = dum_hcd->dum; 987 988 dum->driver = NULL; 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 dum->gadget.name = gadget_name; 1037 dum->gadget.ops = &dummy_ops; 1038 dum->gadget.max_speed = USB_SPEED_SUPER; 1039 1040 dum->gadget.dev.parent = &pdev->dev; 1041 init_dummy_udc_hw(dum); 1042 1043 rc = usb_add_gadget_udc(&pdev->dev, &dum->gadget); 1044 if (rc < 0) 1045 goto err_udc; 1046 1047 rc = device_create_file(&dum->gadget.dev, &dev_attr_function); 1048 if (rc < 0) 1049 goto err_dev; 1050 platform_set_drvdata(pdev, dum); 1051 return rc; 1052 1053 err_dev: 1054 usb_del_gadget_udc(&dum->gadget); 1055 err_udc: 1056 return rc; 1057 } 1058 1059 static int dummy_udc_remove(struct platform_device *pdev) 1060 { 1061 struct dummy *dum = platform_get_drvdata(pdev); 1062 1063 device_remove_file(&dum->gadget.dev, &dev_attr_function); 1064 usb_del_gadget_udc(&dum->gadget); 1065 return 0; 1066 } 1067 1068 static void dummy_udc_pm(struct dummy *dum, struct dummy_hcd *dum_hcd, 1069 int suspend) 1070 { 1071 spin_lock_irq(&dum->lock); 1072 dum->udc_suspended = suspend; 1073 set_link_state(dum_hcd); 1074 spin_unlock_irq(&dum->lock); 1075 } 1076 1077 static int dummy_udc_suspend(struct platform_device *pdev, pm_message_t state) 1078 { 1079 struct dummy *dum = platform_get_drvdata(pdev); 1080 struct dummy_hcd *dum_hcd = gadget_to_dummy_hcd(&dum->gadget); 1081 1082 dev_dbg(&pdev->dev, "%s\n", __func__); 1083 dummy_udc_pm(dum, dum_hcd, 1); 1084 usb_hcd_poll_rh_status(dummy_hcd_to_hcd(dum_hcd)); 1085 return 0; 1086 } 1087 1088 static int dummy_udc_resume(struct platform_device *pdev) 1089 { 1090 struct dummy *dum = platform_get_drvdata(pdev); 1091 struct dummy_hcd *dum_hcd = gadget_to_dummy_hcd(&dum->gadget); 1092 1093 dev_dbg(&pdev->dev, "%s\n", __func__); 1094 dummy_udc_pm(dum, dum_hcd, 0); 1095 usb_hcd_poll_rh_status(dummy_hcd_to_hcd(dum_hcd)); 1096 return 0; 1097 } 1098 1099 static struct platform_driver dummy_udc_driver = { 1100 .probe = dummy_udc_probe, 1101 .remove = dummy_udc_remove, 1102 .suspend = dummy_udc_suspend, 1103 .resume = dummy_udc_resume, 1104 .driver = { 1105 .name = (char *) gadget_name, 1106 }, 1107 }; 1108 1109 /*-------------------------------------------------------------------------*/ 1110 1111 static unsigned int dummy_get_ep_idx(const struct usb_endpoint_descriptor *desc) 1112 { 1113 unsigned int index; 1114 1115 index = usb_endpoint_num(desc) << 1; 1116 if (usb_endpoint_dir_in(desc)) 1117 index |= 1; 1118 return index; 1119 } 1120 1121 /* MASTER/HOST SIDE DRIVER 1122 * 1123 * this uses the hcd framework to hook up to host side drivers. 1124 * its root hub will only have one device, otherwise it acts like 1125 * a normal host controller. 1126 * 1127 * when urbs are queued, they're just stuck on a list that we 1128 * scan in a timer callback. that callback connects writes from 1129 * the host with reads from the device, and so on, based on the 1130 * usb 2.0 rules. 1131 */ 1132 1133 static int dummy_ep_stream_en(struct dummy_hcd *dum_hcd, struct urb *urb) 1134 { 1135 const struct usb_endpoint_descriptor *desc = &urb->ep->desc; 1136 u32 index; 1137 1138 if (!usb_endpoint_xfer_bulk(desc)) 1139 return 0; 1140 1141 index = dummy_get_ep_idx(desc); 1142 return (1 << index) & dum_hcd->stream_en_ep; 1143 } 1144 1145 /* 1146 * The max stream number is saved as a nibble so for the 30 possible endpoints 1147 * we only 15 bytes of memory. Therefore we are limited to max 16 streams (0 1148 * means we use only 1 stream). The maximum according to the spec is 16bit so 1149 * if the 16 stream limit is about to go, the array size should be incremented 1150 * to 30 elements of type u16. 1151 */ 1152 static int get_max_streams_for_pipe(struct dummy_hcd *dum_hcd, 1153 unsigned int pipe) 1154 { 1155 int max_streams; 1156 1157 max_streams = dum_hcd->num_stream[usb_pipeendpoint(pipe)]; 1158 if (usb_pipeout(pipe)) 1159 max_streams >>= 4; 1160 else 1161 max_streams &= 0xf; 1162 max_streams++; 1163 return max_streams; 1164 } 1165 1166 static void set_max_streams_for_pipe(struct dummy_hcd *dum_hcd, 1167 unsigned int pipe, unsigned int streams) 1168 { 1169 int max_streams; 1170 1171 streams--; 1172 max_streams = dum_hcd->num_stream[usb_pipeendpoint(pipe)]; 1173 if (usb_pipeout(pipe)) { 1174 streams <<= 4; 1175 max_streams &= 0xf; 1176 } else { 1177 max_streams &= 0xf0; 1178 } 1179 max_streams |= streams; 1180 dum_hcd->num_stream[usb_pipeendpoint(pipe)] = max_streams; 1181 } 1182 1183 static int dummy_validate_stream(struct dummy_hcd *dum_hcd, struct urb *urb) 1184 { 1185 unsigned int max_streams; 1186 int enabled; 1187 1188 enabled = dummy_ep_stream_en(dum_hcd, urb); 1189 if (!urb->stream_id) { 1190 if (enabled) 1191 return -EINVAL; 1192 return 0; 1193 } 1194 if (!enabled) 1195 return -EINVAL; 1196 1197 max_streams = get_max_streams_for_pipe(dum_hcd, 1198 usb_pipeendpoint(urb->pipe)); 1199 if (urb->stream_id > max_streams) { 1200 dev_err(dummy_dev(dum_hcd), "Stream id %d is out of range.\n", 1201 urb->stream_id); 1202 BUG(); 1203 return -EINVAL; 1204 } 1205 return 0; 1206 } 1207 1208 static int dummy_urb_enqueue( 1209 struct usb_hcd *hcd, 1210 struct urb *urb, 1211 gfp_t mem_flags 1212 ) { 1213 struct dummy_hcd *dum_hcd; 1214 struct urbp *urbp; 1215 unsigned long flags; 1216 int rc; 1217 1218 urbp = kmalloc(sizeof *urbp, mem_flags); 1219 if (!urbp) 1220 return -ENOMEM; 1221 urbp->urb = urb; 1222 urbp->miter_started = 0; 1223 1224 dum_hcd = hcd_to_dummy_hcd(hcd); 1225 spin_lock_irqsave(&dum_hcd->dum->lock, flags); 1226 1227 rc = dummy_validate_stream(dum_hcd, urb); 1228 if (rc) { 1229 kfree(urbp); 1230 goto done; 1231 } 1232 1233 rc = usb_hcd_link_urb_to_ep(hcd, urb); 1234 if (rc) { 1235 kfree(urbp); 1236 goto done; 1237 } 1238 1239 if (!dum_hcd->udev) { 1240 dum_hcd->udev = urb->dev; 1241 usb_get_dev(dum_hcd->udev); 1242 } else if (unlikely(dum_hcd->udev != urb->dev)) 1243 dev_err(dummy_dev(dum_hcd), "usb_device address has changed!\n"); 1244 1245 list_add_tail(&urbp->urbp_list, &dum_hcd->urbp_list); 1246 urb->hcpriv = urbp; 1247 if (usb_pipetype(urb->pipe) == PIPE_CONTROL) 1248 urb->error_count = 1; /* mark as a new urb */ 1249 1250 /* kick the scheduler, it'll do the rest */ 1251 if (!timer_pending(&dum_hcd->timer)) 1252 mod_timer(&dum_hcd->timer, jiffies + 1); 1253 1254 done: 1255 spin_unlock_irqrestore(&dum_hcd->dum->lock, flags); 1256 return rc; 1257 } 1258 1259 static int dummy_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status) 1260 { 1261 struct dummy_hcd *dum_hcd; 1262 unsigned long flags; 1263 int rc; 1264 1265 /* giveback happens automatically in timer callback, 1266 * so make sure the callback happens */ 1267 dum_hcd = hcd_to_dummy_hcd(hcd); 1268 spin_lock_irqsave(&dum_hcd->dum->lock, flags); 1269 1270 rc = usb_hcd_check_unlink_urb(hcd, urb, status); 1271 if (!rc && dum_hcd->rh_state != DUMMY_RH_RUNNING && 1272 !list_empty(&dum_hcd->urbp_list)) 1273 mod_timer(&dum_hcd->timer, jiffies); 1274 1275 spin_unlock_irqrestore(&dum_hcd->dum->lock, flags); 1276 return rc; 1277 } 1278 1279 static int dummy_perform_transfer(struct urb *urb, struct dummy_request *req, 1280 u32 len) 1281 { 1282 void *ubuf, *rbuf; 1283 struct urbp *urbp = urb->hcpriv; 1284 int to_host; 1285 struct sg_mapping_iter *miter = &urbp->miter; 1286 u32 trans = 0; 1287 u32 this_sg; 1288 bool next_sg; 1289 1290 to_host = usb_pipein(urb->pipe); 1291 rbuf = req->req.buf + req->req.actual; 1292 1293 if (!urb->num_sgs) { 1294 ubuf = urb->transfer_buffer + urb->actual_length; 1295 if (to_host) 1296 memcpy(ubuf, rbuf, len); 1297 else 1298 memcpy(rbuf, ubuf, len); 1299 return len; 1300 } 1301 1302 if (!urbp->miter_started) { 1303 u32 flags = SG_MITER_ATOMIC; 1304 1305 if (to_host) 1306 flags |= SG_MITER_TO_SG; 1307 else 1308 flags |= SG_MITER_FROM_SG; 1309 1310 sg_miter_start(miter, urb->sg, urb->num_sgs, flags); 1311 urbp->miter_started = 1; 1312 } 1313 next_sg = sg_miter_next(miter); 1314 if (next_sg == false) { 1315 WARN_ON_ONCE(1); 1316 return -EINVAL; 1317 } 1318 do { 1319 ubuf = miter->addr; 1320 this_sg = min_t(u32, len, miter->length); 1321 miter->consumed = this_sg; 1322 trans += this_sg; 1323 1324 if (to_host) 1325 memcpy(ubuf, rbuf, this_sg); 1326 else 1327 memcpy(rbuf, ubuf, this_sg); 1328 len -= this_sg; 1329 1330 if (!len) 1331 break; 1332 next_sg = sg_miter_next(miter); 1333 if (next_sg == false) { 1334 WARN_ON_ONCE(1); 1335 return -EINVAL; 1336 } 1337 1338 rbuf += this_sg; 1339 } while (1); 1340 1341 sg_miter_stop(miter); 1342 return trans; 1343 } 1344 1345 /* transfer up to a frame's worth; caller must own lock */ 1346 static int transfer(struct dummy_hcd *dum_hcd, struct urb *urb, 1347 struct dummy_ep *ep, int limit, int *status) 1348 { 1349 struct dummy *dum = dum_hcd->dum; 1350 struct dummy_request *req; 1351 1352 top: 1353 /* if there's no request queued, the device is NAKing; return */ 1354 list_for_each_entry(req, &ep->queue, queue) { 1355 unsigned host_len, dev_len, len; 1356 int is_short, to_host; 1357 int rescan = 0; 1358 1359 if (dummy_ep_stream_en(dum_hcd, urb)) { 1360 if ((urb->stream_id != req->req.stream_id)) 1361 continue; 1362 } 1363 1364 /* 1..N packets of ep->ep.maxpacket each ... the last one 1365 * may be short (including zero length). 1366 * 1367 * writer can send a zlp explicitly (length 0) or implicitly 1368 * (length mod maxpacket zero, and 'zero' flag); they always 1369 * terminate reads. 1370 */ 1371 host_len = urb->transfer_buffer_length - urb->actual_length; 1372 dev_len = req->req.length - req->req.actual; 1373 len = min(host_len, dev_len); 1374 1375 /* FIXME update emulated data toggle too */ 1376 1377 to_host = usb_pipein(urb->pipe); 1378 if (unlikely(len == 0)) 1379 is_short = 1; 1380 else { 1381 /* not enough bandwidth left? */ 1382 if (limit < ep->ep.maxpacket && limit < len) 1383 break; 1384 len = min_t(unsigned, len, limit); 1385 if (len == 0) 1386 break; 1387 1388 /* use an extra pass for the final short packet */ 1389 if (len > ep->ep.maxpacket) { 1390 rescan = 1; 1391 len -= (len % ep->ep.maxpacket); 1392 } 1393 is_short = (len % ep->ep.maxpacket) != 0; 1394 1395 len = dummy_perform_transfer(urb, req, len); 1396 1397 ep->last_io = jiffies; 1398 if ((int)len < 0) { 1399 req->req.status = len; 1400 } else { 1401 limit -= len; 1402 urb->actual_length += len; 1403 req->req.actual += len; 1404 } 1405 } 1406 1407 /* short packets terminate, maybe with overflow/underflow. 1408 * it's only really an error to write too much. 1409 * 1410 * partially filling a buffer optionally blocks queue advances 1411 * (so completion handlers can clean up the queue) but we don't 1412 * need to emulate such data-in-flight. 1413 */ 1414 if (is_short) { 1415 if (host_len == dev_len) { 1416 req->req.status = 0; 1417 *status = 0; 1418 } else if (to_host) { 1419 req->req.status = 0; 1420 if (dev_len > host_len) 1421 *status = -EOVERFLOW; 1422 else 1423 *status = 0; 1424 } else if (!to_host) { 1425 *status = 0; 1426 if (host_len > dev_len) 1427 req->req.status = -EOVERFLOW; 1428 else 1429 req->req.status = 0; 1430 } 1431 1432 /* many requests terminate without a short packet */ 1433 } else { 1434 if (req->req.length == req->req.actual 1435 && !req->req.zero) 1436 req->req.status = 0; 1437 if (urb->transfer_buffer_length == urb->actual_length 1438 && !(urb->transfer_flags 1439 & URB_ZERO_PACKET)) 1440 *status = 0; 1441 } 1442 1443 /* device side completion --> continuable */ 1444 if (req->req.status != -EINPROGRESS) { 1445 list_del_init(&req->queue); 1446 1447 spin_unlock(&dum->lock); 1448 usb_gadget_giveback_request(&ep->ep, &req->req); 1449 spin_lock(&dum->lock); 1450 1451 /* requests might have been unlinked... */ 1452 rescan = 1; 1453 } 1454 1455 /* host side completion --> terminate */ 1456 if (*status != -EINPROGRESS) 1457 break; 1458 1459 /* rescan to continue with any other queued i/o */ 1460 if (rescan) 1461 goto top; 1462 } 1463 return limit; 1464 } 1465 1466 static int periodic_bytes(struct dummy *dum, struct dummy_ep *ep) 1467 { 1468 int limit = ep->ep.maxpacket; 1469 1470 if (dum->gadget.speed == USB_SPEED_HIGH) { 1471 int tmp; 1472 1473 /* high bandwidth mode */ 1474 tmp = usb_endpoint_maxp(ep->desc); 1475 tmp = (tmp >> 11) & 0x03; 1476 tmp *= 8 /* applies to entire frame */; 1477 limit += limit * tmp; 1478 } 1479 if (dum->gadget.speed == USB_SPEED_SUPER) { 1480 switch (usb_endpoint_type(ep->desc)) { 1481 case USB_ENDPOINT_XFER_ISOC: 1482 /* Sec. 4.4.8.2 USB3.0 Spec */ 1483 limit = 3 * 16 * 1024 * 8; 1484 break; 1485 case USB_ENDPOINT_XFER_INT: 1486 /* Sec. 4.4.7.2 USB3.0 Spec */ 1487 limit = 3 * 1024 * 8; 1488 break; 1489 case USB_ENDPOINT_XFER_BULK: 1490 default: 1491 break; 1492 } 1493 } 1494 return limit; 1495 } 1496 1497 #define is_active(dum_hcd) ((dum_hcd->port_status & \ 1498 (USB_PORT_STAT_CONNECTION | USB_PORT_STAT_ENABLE | \ 1499 USB_PORT_STAT_SUSPEND)) \ 1500 == (USB_PORT_STAT_CONNECTION | USB_PORT_STAT_ENABLE)) 1501 1502 static struct dummy_ep *find_endpoint(struct dummy *dum, u8 address) 1503 { 1504 int i; 1505 1506 if (!is_active((dum->gadget.speed == USB_SPEED_SUPER ? 1507 dum->ss_hcd : dum->hs_hcd))) 1508 return NULL; 1509 if ((address & ~USB_DIR_IN) == 0) 1510 return &dum->ep[0]; 1511 for (i = 1; i < DUMMY_ENDPOINTS; i++) { 1512 struct dummy_ep *ep = &dum->ep[i]; 1513 1514 if (!ep->desc) 1515 continue; 1516 if (ep->desc->bEndpointAddress == address) 1517 return ep; 1518 } 1519 return NULL; 1520 } 1521 1522 #undef is_active 1523 1524 #define Dev_Request (USB_TYPE_STANDARD | USB_RECIP_DEVICE) 1525 #define Dev_InRequest (Dev_Request | USB_DIR_IN) 1526 #define Intf_Request (USB_TYPE_STANDARD | USB_RECIP_INTERFACE) 1527 #define Intf_InRequest (Intf_Request | USB_DIR_IN) 1528 #define Ep_Request (USB_TYPE_STANDARD | USB_RECIP_ENDPOINT) 1529 #define Ep_InRequest (Ep_Request | USB_DIR_IN) 1530 1531 1532 /** 1533 * handle_control_request() - handles all control transfers 1534 * @dum: pointer to dummy (the_controller) 1535 * @urb: the urb request to handle 1536 * @setup: pointer to the setup data for a USB device control 1537 * request 1538 * @status: pointer to request handling status 1539 * 1540 * Return 0 - if the request was handled 1541 * 1 - if the request wasn't handles 1542 * error code on error 1543 */ 1544 static int handle_control_request(struct dummy_hcd *dum_hcd, struct urb *urb, 1545 struct usb_ctrlrequest *setup, 1546 int *status) 1547 { 1548 struct dummy_ep *ep2; 1549 struct dummy *dum = dum_hcd->dum; 1550 int ret_val = 1; 1551 unsigned w_index; 1552 unsigned w_value; 1553 1554 w_index = le16_to_cpu(setup->wIndex); 1555 w_value = le16_to_cpu(setup->wValue); 1556 switch (setup->bRequest) { 1557 case USB_REQ_SET_ADDRESS: 1558 if (setup->bRequestType != Dev_Request) 1559 break; 1560 dum->address = w_value; 1561 *status = 0; 1562 dev_dbg(udc_dev(dum), "set_address = %d\n", 1563 w_value); 1564 ret_val = 0; 1565 break; 1566 case USB_REQ_SET_FEATURE: 1567 if (setup->bRequestType == Dev_Request) { 1568 ret_val = 0; 1569 switch (w_value) { 1570 case USB_DEVICE_REMOTE_WAKEUP: 1571 break; 1572 case USB_DEVICE_B_HNP_ENABLE: 1573 dum->gadget.b_hnp_enable = 1; 1574 break; 1575 case USB_DEVICE_A_HNP_SUPPORT: 1576 dum->gadget.a_hnp_support = 1; 1577 break; 1578 case USB_DEVICE_A_ALT_HNP_SUPPORT: 1579 dum->gadget.a_alt_hnp_support = 1; 1580 break; 1581 case USB_DEVICE_U1_ENABLE: 1582 if (dummy_hcd_to_hcd(dum_hcd)->speed == 1583 HCD_USB3) 1584 w_value = USB_DEV_STAT_U1_ENABLED; 1585 else 1586 ret_val = -EOPNOTSUPP; 1587 break; 1588 case USB_DEVICE_U2_ENABLE: 1589 if (dummy_hcd_to_hcd(dum_hcd)->speed == 1590 HCD_USB3) 1591 w_value = USB_DEV_STAT_U2_ENABLED; 1592 else 1593 ret_val = -EOPNOTSUPP; 1594 break; 1595 case USB_DEVICE_LTM_ENABLE: 1596 if (dummy_hcd_to_hcd(dum_hcd)->speed == 1597 HCD_USB3) 1598 w_value = USB_DEV_STAT_LTM_ENABLED; 1599 else 1600 ret_val = -EOPNOTSUPP; 1601 break; 1602 default: 1603 ret_val = -EOPNOTSUPP; 1604 } 1605 if (ret_val == 0) { 1606 dum->devstatus |= (1 << w_value); 1607 *status = 0; 1608 } 1609 } else if (setup->bRequestType == Ep_Request) { 1610 /* endpoint halt */ 1611 ep2 = find_endpoint(dum, w_index); 1612 if (!ep2 || ep2->ep.name == ep0name) { 1613 ret_val = -EOPNOTSUPP; 1614 break; 1615 } 1616 ep2->halted = 1; 1617 ret_val = 0; 1618 *status = 0; 1619 } 1620 break; 1621 case USB_REQ_CLEAR_FEATURE: 1622 if (setup->bRequestType == Dev_Request) { 1623 ret_val = 0; 1624 switch (w_value) { 1625 case USB_DEVICE_REMOTE_WAKEUP: 1626 w_value = USB_DEVICE_REMOTE_WAKEUP; 1627 break; 1628 case USB_DEVICE_U1_ENABLE: 1629 if (dummy_hcd_to_hcd(dum_hcd)->speed == 1630 HCD_USB3) 1631 w_value = USB_DEV_STAT_U1_ENABLED; 1632 else 1633 ret_val = -EOPNOTSUPP; 1634 break; 1635 case USB_DEVICE_U2_ENABLE: 1636 if (dummy_hcd_to_hcd(dum_hcd)->speed == 1637 HCD_USB3) 1638 w_value = USB_DEV_STAT_U2_ENABLED; 1639 else 1640 ret_val = -EOPNOTSUPP; 1641 break; 1642 case USB_DEVICE_LTM_ENABLE: 1643 if (dummy_hcd_to_hcd(dum_hcd)->speed == 1644 HCD_USB3) 1645 w_value = USB_DEV_STAT_LTM_ENABLED; 1646 else 1647 ret_val = -EOPNOTSUPP; 1648 break; 1649 default: 1650 ret_val = -EOPNOTSUPP; 1651 break; 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) { 1661 ret_val = -EOPNOTSUPP; 1662 break; 1663 } 1664 if (!ep2->wedged) 1665 ep2->halted = 0; 1666 ret_val = 0; 1667 *status = 0; 1668 } 1669 break; 1670 case USB_REQ_GET_STATUS: 1671 if (setup->bRequestType == Dev_InRequest 1672 || setup->bRequestType == Intf_InRequest 1673 || setup->bRequestType == Ep_InRequest) { 1674 char *buf; 1675 /* 1676 * device: remote wakeup, selfpowered 1677 * interface: nothing 1678 * endpoint: halt 1679 */ 1680 buf = (char *)urb->transfer_buffer; 1681 if (urb->transfer_buffer_length > 0) { 1682 if (setup->bRequestType == Ep_InRequest) { 1683 ep2 = find_endpoint(dum, w_index); 1684 if (!ep2) { 1685 ret_val = -EOPNOTSUPP; 1686 break; 1687 } 1688 buf[0] = ep2->halted; 1689 } else if (setup->bRequestType == 1690 Dev_InRequest) { 1691 buf[0] = (u8)dum->devstatus; 1692 } else 1693 buf[0] = 0; 1694 } 1695 if (urb->transfer_buffer_length > 1) 1696 buf[1] = 0; 1697 urb->actual_length = min_t(u32, 2, 1698 urb->transfer_buffer_length); 1699 ret_val = 0; 1700 *status = 0; 1701 } 1702 break; 1703 } 1704 return ret_val; 1705 } 1706 1707 /* drive both sides of the transfers; looks like irq handlers to 1708 * both drivers except the callbacks aren't in_irq(). 1709 */ 1710 static void dummy_timer(unsigned long _dum_hcd) 1711 { 1712 struct dummy_hcd *dum_hcd = (struct dummy_hcd *) _dum_hcd; 1713 struct dummy *dum = dum_hcd->dum; 1714 struct urbp *urbp, *tmp; 1715 unsigned long flags; 1716 int limit, total; 1717 int i; 1718 1719 /* simplistic model for one frame's bandwidth */ 1720 switch (dum->gadget.speed) { 1721 case USB_SPEED_LOW: 1722 total = 8/*bytes*/ * 12/*packets*/; 1723 break; 1724 case USB_SPEED_FULL: 1725 total = 64/*bytes*/ * 19/*packets*/; 1726 break; 1727 case USB_SPEED_HIGH: 1728 total = 512/*bytes*/ * 13/*packets*/ * 8/*uframes*/; 1729 break; 1730 case USB_SPEED_SUPER: 1731 /* Bus speed is 500000 bytes/ms, so use a little less */ 1732 total = 490000; 1733 break; 1734 default: 1735 dev_err(dummy_dev(dum_hcd), "bogus device speed\n"); 1736 return; 1737 } 1738 1739 /* FIXME if HZ != 1000 this will probably misbehave ... */ 1740 1741 /* look at each urb queued by the host side driver */ 1742 spin_lock_irqsave(&dum->lock, flags); 1743 1744 if (!dum_hcd->udev) { 1745 dev_err(dummy_dev(dum_hcd), 1746 "timer fired with no URBs pending?\n"); 1747 spin_unlock_irqrestore(&dum->lock, flags); 1748 return; 1749 } 1750 1751 for (i = 0; i < DUMMY_ENDPOINTS; i++) { 1752 if (!ep_info[i].name) 1753 break; 1754 dum->ep[i].already_seen = 0; 1755 } 1756 1757 restart: 1758 list_for_each_entry_safe(urbp, tmp, &dum_hcd->urbp_list, urbp_list) { 1759 struct urb *urb; 1760 struct dummy_request *req; 1761 u8 address; 1762 struct dummy_ep *ep = NULL; 1763 int type; 1764 int status = -EINPROGRESS; 1765 1766 urb = urbp->urb; 1767 if (urb->unlinked) 1768 goto return_urb; 1769 else if (dum_hcd->rh_state != DUMMY_RH_RUNNING) 1770 continue; 1771 type = usb_pipetype(urb->pipe); 1772 1773 /* used up this frame's non-periodic bandwidth? 1774 * FIXME there's infinite bandwidth for control and 1775 * periodic transfers ... unrealistic. 1776 */ 1777 if (total <= 0 && type == PIPE_BULK) 1778 continue; 1779 1780 /* find the gadget's ep for this request (if configured) */ 1781 address = usb_pipeendpoint (urb->pipe); 1782 if (usb_pipein(urb->pipe)) 1783 address |= USB_DIR_IN; 1784 ep = find_endpoint(dum, address); 1785 if (!ep) { 1786 /* set_configuration() disagreement */ 1787 dev_dbg(dummy_dev(dum_hcd), 1788 "no ep configured for urb %p\n", 1789 urb); 1790 status = -EPROTO; 1791 goto return_urb; 1792 } 1793 1794 if (ep->already_seen) 1795 continue; 1796 ep->already_seen = 1; 1797 if (ep == &dum->ep[0] && urb->error_count) { 1798 ep->setup_stage = 1; /* a new urb */ 1799 urb->error_count = 0; 1800 } 1801 if (ep->halted && !ep->setup_stage) { 1802 /* NOTE: must not be iso! */ 1803 dev_dbg(dummy_dev(dum_hcd), "ep %s halted, urb %p\n", 1804 ep->ep.name, urb); 1805 status = -EPIPE; 1806 goto return_urb; 1807 } 1808 /* FIXME make sure both ends agree on maxpacket */ 1809 1810 /* handle control requests */ 1811 if (ep == &dum->ep[0] && ep->setup_stage) { 1812 struct usb_ctrlrequest setup; 1813 int value = 1; 1814 1815 setup = *(struct usb_ctrlrequest *) urb->setup_packet; 1816 /* paranoia, in case of stale queued data */ 1817 list_for_each_entry(req, &ep->queue, queue) { 1818 list_del_init(&req->queue); 1819 req->req.status = -EOVERFLOW; 1820 dev_dbg(udc_dev(dum), "stale req = %p\n", 1821 req); 1822 1823 spin_unlock(&dum->lock); 1824 usb_gadget_giveback_request(&ep->ep, &req->req); 1825 spin_lock(&dum->lock); 1826 ep->already_seen = 0; 1827 goto restart; 1828 } 1829 1830 /* gadget driver never sees set_address or operations 1831 * on standard feature flags. some hardware doesn't 1832 * even expose them. 1833 */ 1834 ep->last_io = jiffies; 1835 ep->setup_stage = 0; 1836 ep->halted = 0; 1837 1838 value = handle_control_request(dum_hcd, urb, &setup, 1839 &status); 1840 1841 /* gadget driver handles all other requests. block 1842 * until setup() returns; no reentrancy issues etc. 1843 */ 1844 if (value > 0) { 1845 spin_unlock(&dum->lock); 1846 value = dum->driver->setup(&dum->gadget, 1847 &setup); 1848 spin_lock(&dum->lock); 1849 1850 if (value >= 0) { 1851 /* no delays (max 64KB data stage) */ 1852 limit = 64*1024; 1853 goto treat_control_like_bulk; 1854 } 1855 /* error, see below */ 1856 } 1857 1858 if (value < 0) { 1859 if (value != -EOPNOTSUPP) 1860 dev_dbg(udc_dev(dum), 1861 "setup --> %d\n", 1862 value); 1863 status = -EPIPE; 1864 urb->actual_length = 0; 1865 } 1866 1867 goto return_urb; 1868 } 1869 1870 /* non-control requests */ 1871 limit = total; 1872 switch (usb_pipetype(urb->pipe)) { 1873 case PIPE_ISOCHRONOUS: 1874 /* FIXME is it urb->interval since the last xfer? 1875 * use urb->iso_frame_desc[i]. 1876 * complete whether or not ep has requests queued. 1877 * report random errors, to debug drivers. 1878 */ 1879 limit = max(limit, periodic_bytes(dum, ep)); 1880 status = -ENOSYS; 1881 break; 1882 1883 case PIPE_INTERRUPT: 1884 /* FIXME is it urb->interval since the last xfer? 1885 * this almost certainly polls too fast. 1886 */ 1887 limit = max(limit, periodic_bytes(dum, ep)); 1888 /* FALLTHROUGH */ 1889 1890 default: 1891 treat_control_like_bulk: 1892 ep->last_io = jiffies; 1893 total = transfer(dum_hcd, urb, ep, limit, &status); 1894 break; 1895 } 1896 1897 /* incomplete transfer? */ 1898 if (status == -EINPROGRESS) 1899 continue; 1900 1901 return_urb: 1902 list_del(&urbp->urbp_list); 1903 kfree(urbp); 1904 if (ep) 1905 ep->already_seen = ep->setup_stage = 0; 1906 1907 usb_hcd_unlink_urb_from_ep(dummy_hcd_to_hcd(dum_hcd), urb); 1908 spin_unlock(&dum->lock); 1909 usb_hcd_giveback_urb(dummy_hcd_to_hcd(dum_hcd), urb, status); 1910 spin_lock(&dum->lock); 1911 1912 goto restart; 1913 } 1914 1915 if (list_empty(&dum_hcd->urbp_list)) { 1916 usb_put_dev(dum_hcd->udev); 1917 dum_hcd->udev = NULL; 1918 } else if (dum_hcd->rh_state == DUMMY_RH_RUNNING) { 1919 /* want a 1 msec delay here */ 1920 mod_timer(&dum_hcd->timer, jiffies + msecs_to_jiffies(1)); 1921 } 1922 1923 spin_unlock_irqrestore(&dum->lock, flags); 1924 } 1925 1926 /*-------------------------------------------------------------------------*/ 1927 1928 #define PORT_C_MASK \ 1929 ((USB_PORT_STAT_C_CONNECTION \ 1930 | USB_PORT_STAT_C_ENABLE \ 1931 | USB_PORT_STAT_C_SUSPEND \ 1932 | USB_PORT_STAT_C_OVERCURRENT \ 1933 | USB_PORT_STAT_C_RESET) << 16) 1934 1935 static int dummy_hub_status(struct usb_hcd *hcd, char *buf) 1936 { 1937 struct dummy_hcd *dum_hcd; 1938 unsigned long flags; 1939 int retval = 0; 1940 1941 dum_hcd = hcd_to_dummy_hcd(hcd); 1942 1943 spin_lock_irqsave(&dum_hcd->dum->lock, flags); 1944 if (!HCD_HW_ACCESSIBLE(hcd)) 1945 goto done; 1946 1947 if (dum_hcd->resuming && time_after_eq(jiffies, dum_hcd->re_timeout)) { 1948 dum_hcd->port_status |= (USB_PORT_STAT_C_SUSPEND << 16); 1949 dum_hcd->port_status &= ~USB_PORT_STAT_SUSPEND; 1950 set_link_state(dum_hcd); 1951 } 1952 1953 if ((dum_hcd->port_status & PORT_C_MASK) != 0) { 1954 *buf = (1 << 1); 1955 dev_dbg(dummy_dev(dum_hcd), "port status 0x%08x has changes\n", 1956 dum_hcd->port_status); 1957 retval = 1; 1958 if (dum_hcd->rh_state == DUMMY_RH_SUSPENDED) 1959 usb_hcd_resume_root_hub(hcd); 1960 } 1961 done: 1962 spin_unlock_irqrestore(&dum_hcd->dum->lock, flags); 1963 return retval; 1964 } 1965 1966 /* usb 3.0 root hub device descriptor */ 1967 static struct { 1968 struct usb_bos_descriptor bos; 1969 struct usb_ss_cap_descriptor ss_cap; 1970 } __packed usb3_bos_desc = { 1971 1972 .bos = { 1973 .bLength = USB_DT_BOS_SIZE, 1974 .bDescriptorType = USB_DT_BOS, 1975 .wTotalLength = cpu_to_le16(sizeof(usb3_bos_desc)), 1976 .bNumDeviceCaps = 1, 1977 }, 1978 .ss_cap = { 1979 .bLength = USB_DT_USB_SS_CAP_SIZE, 1980 .bDescriptorType = USB_DT_DEVICE_CAPABILITY, 1981 .bDevCapabilityType = USB_SS_CAP_TYPE, 1982 .wSpeedSupported = cpu_to_le16(USB_5GBPS_OPERATION), 1983 .bFunctionalitySupport = ilog2(USB_5GBPS_OPERATION), 1984 }, 1985 }; 1986 1987 static inline void 1988 ss_hub_descriptor(struct usb_hub_descriptor *desc) 1989 { 1990 memset(desc, 0, sizeof *desc); 1991 desc->bDescriptorType = USB_DT_SS_HUB; 1992 desc->bDescLength = 12; 1993 desc->wHubCharacteristics = cpu_to_le16( 1994 HUB_CHAR_INDV_PORT_LPSM | 1995 HUB_CHAR_COMMON_OCPM); 1996 desc->bNbrPorts = 1; 1997 desc->u.ss.bHubHdrDecLat = 0x04; /* Worst case: 0.4 micro sec*/ 1998 desc->u.ss.DeviceRemovable = 0xffff; 1999 } 2000 2001 static inline void hub_descriptor(struct usb_hub_descriptor *desc) 2002 { 2003 memset(desc, 0, sizeof *desc); 2004 desc->bDescriptorType = USB_DT_HUB; 2005 desc->bDescLength = 9; 2006 desc->wHubCharacteristics = cpu_to_le16( 2007 HUB_CHAR_INDV_PORT_LPSM | 2008 HUB_CHAR_COMMON_OCPM); 2009 desc->bNbrPorts = 1; 2010 desc->u.hs.DeviceRemovable[0] = 0xff; 2011 desc->u.hs.DeviceRemovable[1] = 0xff; 2012 } 2013 2014 static int dummy_hub_control( 2015 struct usb_hcd *hcd, 2016 u16 typeReq, 2017 u16 wValue, 2018 u16 wIndex, 2019 char *buf, 2020 u16 wLength 2021 ) { 2022 struct dummy_hcd *dum_hcd; 2023 int retval = 0; 2024 unsigned long flags; 2025 2026 if (!HCD_HW_ACCESSIBLE(hcd)) 2027 return -ETIMEDOUT; 2028 2029 dum_hcd = hcd_to_dummy_hcd(hcd); 2030 2031 spin_lock_irqsave(&dum_hcd->dum->lock, flags); 2032 switch (typeReq) { 2033 case ClearHubFeature: 2034 break; 2035 case ClearPortFeature: 2036 switch (wValue) { 2037 case USB_PORT_FEAT_SUSPEND: 2038 if (hcd->speed == HCD_USB3) { 2039 dev_dbg(dummy_dev(dum_hcd), 2040 "USB_PORT_FEAT_SUSPEND req not " 2041 "supported for USB 3.0 roothub\n"); 2042 goto error; 2043 } 2044 if (dum_hcd->port_status & USB_PORT_STAT_SUSPEND) { 2045 /* 20msec resume signaling */ 2046 dum_hcd->resuming = 1; 2047 dum_hcd->re_timeout = jiffies + 2048 msecs_to_jiffies(20); 2049 } 2050 break; 2051 case USB_PORT_FEAT_POWER: 2052 if (hcd->speed == HCD_USB3) { 2053 if (dum_hcd->port_status & USB_PORT_STAT_POWER) 2054 dev_dbg(dummy_dev(dum_hcd), 2055 "power-off\n"); 2056 } else 2057 if (dum_hcd->port_status & 2058 USB_SS_PORT_STAT_POWER) 2059 dev_dbg(dummy_dev(dum_hcd), 2060 "power-off\n"); 2061 /* FALLS THROUGH */ 2062 default: 2063 dum_hcd->port_status &= ~(1 << wValue); 2064 set_link_state(dum_hcd); 2065 } 2066 break; 2067 case GetHubDescriptor: 2068 if (hcd->speed == HCD_USB3 && 2069 (wLength < USB_DT_SS_HUB_SIZE || 2070 wValue != (USB_DT_SS_HUB << 8))) { 2071 dev_dbg(dummy_dev(dum_hcd), 2072 "Wrong hub descriptor type for " 2073 "USB 3.0 roothub.\n"); 2074 goto error; 2075 } 2076 if (hcd->speed == HCD_USB3) 2077 ss_hub_descriptor((struct usb_hub_descriptor *) buf); 2078 else 2079 hub_descriptor((struct usb_hub_descriptor *) buf); 2080 break; 2081 2082 case DeviceRequest | USB_REQ_GET_DESCRIPTOR: 2083 if (hcd->speed != HCD_USB3) 2084 goto error; 2085 2086 if ((wValue >> 8) != USB_DT_BOS) 2087 goto error; 2088 2089 memcpy(buf, &usb3_bos_desc, sizeof(usb3_bos_desc)); 2090 retval = sizeof(usb3_bos_desc); 2091 break; 2092 2093 case GetHubStatus: 2094 *(__le32 *) buf = cpu_to_le32(0); 2095 break; 2096 case GetPortStatus: 2097 if (wIndex != 1) 2098 retval = -EPIPE; 2099 2100 /* whoever resets or resumes must GetPortStatus to 2101 * complete it!! 2102 */ 2103 if (dum_hcd->resuming && 2104 time_after_eq(jiffies, dum_hcd->re_timeout)) { 2105 dum_hcd->port_status |= (USB_PORT_STAT_C_SUSPEND << 16); 2106 dum_hcd->port_status &= ~USB_PORT_STAT_SUSPEND; 2107 } 2108 if ((dum_hcd->port_status & USB_PORT_STAT_RESET) != 0 && 2109 time_after_eq(jiffies, dum_hcd->re_timeout)) { 2110 dum_hcd->port_status |= (USB_PORT_STAT_C_RESET << 16); 2111 dum_hcd->port_status &= ~USB_PORT_STAT_RESET; 2112 if (dum_hcd->dum->pullup) { 2113 dum_hcd->port_status |= USB_PORT_STAT_ENABLE; 2114 2115 if (hcd->speed < HCD_USB3) { 2116 switch (dum_hcd->dum->gadget.speed) { 2117 case USB_SPEED_HIGH: 2118 dum_hcd->port_status |= 2119 USB_PORT_STAT_HIGH_SPEED; 2120 break; 2121 case USB_SPEED_LOW: 2122 dum_hcd->dum->gadget.ep0-> 2123 maxpacket = 8; 2124 dum_hcd->port_status |= 2125 USB_PORT_STAT_LOW_SPEED; 2126 break; 2127 default: 2128 dum_hcd->dum->gadget.speed = 2129 USB_SPEED_FULL; 2130 break; 2131 } 2132 } 2133 } 2134 } 2135 set_link_state(dum_hcd); 2136 ((__le16 *) buf)[0] = cpu_to_le16(dum_hcd->port_status); 2137 ((__le16 *) buf)[1] = cpu_to_le16(dum_hcd->port_status >> 16); 2138 break; 2139 case SetHubFeature: 2140 retval = -EPIPE; 2141 break; 2142 case SetPortFeature: 2143 switch (wValue) { 2144 case USB_PORT_FEAT_LINK_STATE: 2145 if (hcd->speed != HCD_USB3) { 2146 dev_dbg(dummy_dev(dum_hcd), 2147 "USB_PORT_FEAT_LINK_STATE req not " 2148 "supported for USB 2.0 roothub\n"); 2149 goto error; 2150 } 2151 /* 2152 * Since this is dummy we don't have an actual link so 2153 * there is nothing to do for the SET_LINK_STATE cmd 2154 */ 2155 break; 2156 case USB_PORT_FEAT_U1_TIMEOUT: 2157 case USB_PORT_FEAT_U2_TIMEOUT: 2158 /* TODO: add suspend/resume support! */ 2159 if (hcd->speed != HCD_USB3) { 2160 dev_dbg(dummy_dev(dum_hcd), 2161 "USB_PORT_FEAT_U1/2_TIMEOUT req not " 2162 "supported for USB 2.0 roothub\n"); 2163 goto error; 2164 } 2165 break; 2166 case USB_PORT_FEAT_SUSPEND: 2167 /* Applicable only for USB2.0 hub */ 2168 if (hcd->speed == HCD_USB3) { 2169 dev_dbg(dummy_dev(dum_hcd), 2170 "USB_PORT_FEAT_SUSPEND req not " 2171 "supported for USB 3.0 roothub\n"); 2172 goto error; 2173 } 2174 if (dum_hcd->active) { 2175 dum_hcd->port_status |= USB_PORT_STAT_SUSPEND; 2176 2177 /* HNP would happen here; for now we 2178 * assume b_bus_req is always true. 2179 */ 2180 set_link_state(dum_hcd); 2181 if (((1 << USB_DEVICE_B_HNP_ENABLE) 2182 & dum_hcd->dum->devstatus) != 0) 2183 dev_dbg(dummy_dev(dum_hcd), 2184 "no HNP yet!\n"); 2185 } 2186 break; 2187 case USB_PORT_FEAT_POWER: 2188 if (hcd->speed == HCD_USB3) 2189 dum_hcd->port_status |= USB_SS_PORT_STAT_POWER; 2190 else 2191 dum_hcd->port_status |= USB_PORT_STAT_POWER; 2192 set_link_state(dum_hcd); 2193 break; 2194 case USB_PORT_FEAT_BH_PORT_RESET: 2195 /* Applicable only for USB3.0 hub */ 2196 if (hcd->speed != HCD_USB3) { 2197 dev_dbg(dummy_dev(dum_hcd), 2198 "USB_PORT_FEAT_BH_PORT_RESET req not " 2199 "supported for USB 2.0 roothub\n"); 2200 goto error; 2201 } 2202 /* FALLS THROUGH */ 2203 case USB_PORT_FEAT_RESET: 2204 /* if it's already enabled, disable */ 2205 if (hcd->speed == HCD_USB3) { 2206 dum_hcd->port_status = 0; 2207 dum_hcd->port_status = 2208 (USB_SS_PORT_STAT_POWER | 2209 USB_PORT_STAT_CONNECTION | 2210 USB_PORT_STAT_RESET); 2211 } else 2212 dum_hcd->port_status &= ~(USB_PORT_STAT_ENABLE 2213 | USB_PORT_STAT_LOW_SPEED 2214 | USB_PORT_STAT_HIGH_SPEED); 2215 /* 2216 * We want to reset device status. All but the 2217 * Self powered feature 2218 */ 2219 dum_hcd->dum->devstatus &= 2220 (1 << USB_DEVICE_SELF_POWERED); 2221 /* 2222 * FIXME USB3.0: what is the correct reset signaling 2223 * interval? Is it still 50msec as for HS? 2224 */ 2225 dum_hcd->re_timeout = jiffies + msecs_to_jiffies(50); 2226 /* FALLS THROUGH */ 2227 default: 2228 if (hcd->speed == HCD_USB3) { 2229 if ((dum_hcd->port_status & 2230 USB_SS_PORT_STAT_POWER) != 0) { 2231 dum_hcd->port_status |= (1 << wValue); 2232 set_link_state(dum_hcd); 2233 } 2234 } else 2235 if ((dum_hcd->port_status & 2236 USB_PORT_STAT_POWER) != 0) { 2237 dum_hcd->port_status |= (1 << wValue); 2238 set_link_state(dum_hcd); 2239 } 2240 } 2241 break; 2242 case GetPortErrorCount: 2243 if (hcd->speed != HCD_USB3) { 2244 dev_dbg(dummy_dev(dum_hcd), 2245 "GetPortErrorCount req not " 2246 "supported for USB 2.0 roothub\n"); 2247 goto error; 2248 } 2249 /* We'll always return 0 since this is a dummy hub */ 2250 *(__le32 *) buf = cpu_to_le32(0); 2251 break; 2252 case SetHubDepth: 2253 if (hcd->speed != HCD_USB3) { 2254 dev_dbg(dummy_dev(dum_hcd), 2255 "SetHubDepth req not supported for " 2256 "USB 2.0 roothub\n"); 2257 goto error; 2258 } 2259 break; 2260 default: 2261 dev_dbg(dummy_dev(dum_hcd), 2262 "hub control req%04x v%04x i%04x l%d\n", 2263 typeReq, wValue, wIndex, wLength); 2264 error: 2265 /* "protocol stall" on error */ 2266 retval = -EPIPE; 2267 } 2268 spin_unlock_irqrestore(&dum_hcd->dum->lock, flags); 2269 2270 if ((dum_hcd->port_status & PORT_C_MASK) != 0) 2271 usb_hcd_poll_rh_status(hcd); 2272 return retval; 2273 } 2274 2275 static int dummy_bus_suspend(struct usb_hcd *hcd) 2276 { 2277 struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd); 2278 2279 dev_dbg(&hcd->self.root_hub->dev, "%s\n", __func__); 2280 2281 spin_lock_irq(&dum_hcd->dum->lock); 2282 dum_hcd->rh_state = DUMMY_RH_SUSPENDED; 2283 set_link_state(dum_hcd); 2284 hcd->state = HC_STATE_SUSPENDED; 2285 spin_unlock_irq(&dum_hcd->dum->lock); 2286 return 0; 2287 } 2288 2289 static int dummy_bus_resume(struct usb_hcd *hcd) 2290 { 2291 struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd); 2292 int rc = 0; 2293 2294 dev_dbg(&hcd->self.root_hub->dev, "%s\n", __func__); 2295 2296 spin_lock_irq(&dum_hcd->dum->lock); 2297 if (!HCD_HW_ACCESSIBLE(hcd)) { 2298 rc = -ESHUTDOWN; 2299 } else { 2300 dum_hcd->rh_state = DUMMY_RH_RUNNING; 2301 set_link_state(dum_hcd); 2302 if (!list_empty(&dum_hcd->urbp_list)) 2303 mod_timer(&dum_hcd->timer, jiffies); 2304 hcd->state = HC_STATE_RUNNING; 2305 } 2306 spin_unlock_irq(&dum_hcd->dum->lock); 2307 return rc; 2308 } 2309 2310 /*-------------------------------------------------------------------------*/ 2311 2312 static inline ssize_t show_urb(char *buf, size_t size, struct urb *urb) 2313 { 2314 int ep = usb_pipeendpoint(urb->pipe); 2315 2316 return snprintf(buf, size, 2317 "urb/%p %s ep%d%s%s len %d/%d\n", 2318 urb, 2319 ({ char *s; 2320 switch (urb->dev->speed) { 2321 case USB_SPEED_LOW: 2322 s = "ls"; 2323 break; 2324 case USB_SPEED_FULL: 2325 s = "fs"; 2326 break; 2327 case USB_SPEED_HIGH: 2328 s = "hs"; 2329 break; 2330 case USB_SPEED_SUPER: 2331 s = "ss"; 2332 break; 2333 default: 2334 s = "?"; 2335 break; 2336 } s; }), 2337 ep, ep ? (usb_pipein(urb->pipe) ? "in" : "out") : "", 2338 ({ char *s; \ 2339 switch (usb_pipetype(urb->pipe)) { \ 2340 case PIPE_CONTROL: \ 2341 s = ""; \ 2342 break; \ 2343 case PIPE_BULK: \ 2344 s = "-bulk"; \ 2345 break; \ 2346 case PIPE_INTERRUPT: \ 2347 s = "-int"; \ 2348 break; \ 2349 default: \ 2350 s = "-iso"; \ 2351 break; \ 2352 } s; }), 2353 urb->actual_length, urb->transfer_buffer_length); 2354 } 2355 2356 static ssize_t urbs_show(struct device *dev, struct device_attribute *attr, 2357 char *buf) 2358 { 2359 struct usb_hcd *hcd = dev_get_drvdata(dev); 2360 struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd); 2361 struct urbp *urbp; 2362 size_t size = 0; 2363 unsigned long flags; 2364 2365 spin_lock_irqsave(&dum_hcd->dum->lock, flags); 2366 list_for_each_entry(urbp, &dum_hcd->urbp_list, urbp_list) { 2367 size_t temp; 2368 2369 temp = show_urb(buf, PAGE_SIZE - size, urbp->urb); 2370 buf += temp; 2371 size += temp; 2372 } 2373 spin_unlock_irqrestore(&dum_hcd->dum->lock, flags); 2374 2375 return size; 2376 } 2377 static DEVICE_ATTR_RO(urbs); 2378 2379 static int dummy_start_ss(struct dummy_hcd *dum_hcd) 2380 { 2381 init_timer(&dum_hcd->timer); 2382 dum_hcd->timer.function = dummy_timer; 2383 dum_hcd->timer.data = (unsigned long)dum_hcd; 2384 dum_hcd->rh_state = DUMMY_RH_RUNNING; 2385 dum_hcd->stream_en_ep = 0; 2386 INIT_LIST_HEAD(&dum_hcd->urbp_list); 2387 dummy_hcd_to_hcd(dum_hcd)->power_budget = POWER_BUDGET; 2388 dummy_hcd_to_hcd(dum_hcd)->state = HC_STATE_RUNNING; 2389 dummy_hcd_to_hcd(dum_hcd)->uses_new_polling = 1; 2390 #ifdef CONFIG_USB_OTG 2391 dummy_hcd_to_hcd(dum_hcd)->self.otg_port = 1; 2392 #endif 2393 return 0; 2394 2395 /* FIXME 'urbs' should be a per-device thing, maybe in usbcore */ 2396 return device_create_file(dummy_dev(dum_hcd), &dev_attr_urbs); 2397 } 2398 2399 static int dummy_start(struct usb_hcd *hcd) 2400 { 2401 struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd); 2402 2403 /* 2404 * MASTER side init ... we emulate a root hub that'll only ever 2405 * talk to one device (the slave side). Also appears in sysfs, 2406 * just like more familiar pci-based HCDs. 2407 */ 2408 if (!usb_hcd_is_primary_hcd(hcd)) 2409 return dummy_start_ss(dum_hcd); 2410 2411 spin_lock_init(&dum_hcd->dum->lock); 2412 init_timer(&dum_hcd->timer); 2413 dum_hcd->timer.function = dummy_timer; 2414 dum_hcd->timer.data = (unsigned long)dum_hcd; 2415 dum_hcd->rh_state = DUMMY_RH_RUNNING; 2416 2417 INIT_LIST_HEAD(&dum_hcd->urbp_list); 2418 2419 hcd->power_budget = POWER_BUDGET; 2420 hcd->state = HC_STATE_RUNNING; 2421 hcd->uses_new_polling = 1; 2422 2423 #ifdef CONFIG_USB_OTG 2424 hcd->self.otg_port = 1; 2425 #endif 2426 2427 /* FIXME 'urbs' should be a per-device thing, maybe in usbcore */ 2428 return device_create_file(dummy_dev(dum_hcd), &dev_attr_urbs); 2429 } 2430 2431 static void dummy_stop(struct usb_hcd *hcd) 2432 { 2433 struct dummy *dum; 2434 2435 dum = hcd_to_dummy_hcd(hcd)->dum; 2436 device_remove_file(dummy_dev(hcd_to_dummy_hcd(hcd)), &dev_attr_urbs); 2437 dev_info(dummy_dev(hcd_to_dummy_hcd(hcd)), "stopped\n"); 2438 } 2439 2440 /*-------------------------------------------------------------------------*/ 2441 2442 static int dummy_h_get_frame(struct usb_hcd *hcd) 2443 { 2444 return dummy_g_get_frame(NULL); 2445 } 2446 2447 static int dummy_setup(struct usb_hcd *hcd) 2448 { 2449 struct dummy *dum; 2450 2451 dum = *((void **)dev_get_platdata(hcd->self.controller)); 2452 hcd->self.sg_tablesize = ~0; 2453 if (usb_hcd_is_primary_hcd(hcd)) { 2454 dum->hs_hcd = hcd_to_dummy_hcd(hcd); 2455 dum->hs_hcd->dum = dum; 2456 /* 2457 * Mark the first roothub as being USB 2.0. 2458 * The USB 3.0 roothub will be registered later by 2459 * dummy_hcd_probe() 2460 */ 2461 hcd->speed = HCD_USB2; 2462 hcd->self.root_hub->speed = USB_SPEED_HIGH; 2463 } else { 2464 dum->ss_hcd = hcd_to_dummy_hcd(hcd); 2465 dum->ss_hcd->dum = dum; 2466 hcd->speed = HCD_USB3; 2467 hcd->self.root_hub->speed = USB_SPEED_SUPER; 2468 } 2469 return 0; 2470 } 2471 2472 /* Change a group of bulk endpoints to support multiple stream IDs */ 2473 static int dummy_alloc_streams(struct usb_hcd *hcd, struct usb_device *udev, 2474 struct usb_host_endpoint **eps, unsigned int num_eps, 2475 unsigned int num_streams, gfp_t mem_flags) 2476 { 2477 struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd); 2478 unsigned long flags; 2479 int max_stream; 2480 int ret_streams = num_streams; 2481 unsigned int index; 2482 unsigned int i; 2483 2484 if (!num_eps) 2485 return -EINVAL; 2486 2487 spin_lock_irqsave(&dum_hcd->dum->lock, flags); 2488 for (i = 0; i < num_eps; i++) { 2489 index = dummy_get_ep_idx(&eps[i]->desc); 2490 if ((1 << index) & dum_hcd->stream_en_ep) { 2491 ret_streams = -EINVAL; 2492 goto out; 2493 } 2494 max_stream = usb_ss_max_streams(&eps[i]->ss_ep_comp); 2495 if (!max_stream) { 2496 ret_streams = -EINVAL; 2497 goto out; 2498 } 2499 if (max_stream < ret_streams) { 2500 dev_dbg(dummy_dev(dum_hcd), "Ep 0x%x only supports %u " 2501 "stream IDs.\n", 2502 eps[i]->desc.bEndpointAddress, 2503 max_stream); 2504 ret_streams = max_stream; 2505 } 2506 } 2507 2508 for (i = 0; i < num_eps; i++) { 2509 index = dummy_get_ep_idx(&eps[i]->desc); 2510 dum_hcd->stream_en_ep |= 1 << index; 2511 set_max_streams_for_pipe(dum_hcd, 2512 usb_endpoint_num(&eps[i]->desc), ret_streams); 2513 } 2514 out: 2515 spin_unlock_irqrestore(&dum_hcd->dum->lock, flags); 2516 return ret_streams; 2517 } 2518 2519 /* Reverts a group of bulk endpoints back to not using stream IDs. */ 2520 static int dummy_free_streams(struct usb_hcd *hcd, struct usb_device *udev, 2521 struct usb_host_endpoint **eps, unsigned int num_eps, 2522 gfp_t mem_flags) 2523 { 2524 struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd); 2525 unsigned long flags; 2526 int ret; 2527 unsigned int index; 2528 unsigned int i; 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 = -EINVAL; 2535 goto out; 2536 } 2537 } 2538 2539 for (i = 0; i < num_eps; i++) { 2540 index = dummy_get_ep_idx(&eps[i]->desc); 2541 dum_hcd->stream_en_ep &= ~(1 << index); 2542 set_max_streams_for_pipe(dum_hcd, 2543 usb_endpoint_num(&eps[i]->desc), 0); 2544 } 2545 ret = 0; 2546 out: 2547 spin_unlock_irqrestore(&dum_hcd->dum->lock, flags); 2548 return ret; 2549 } 2550 2551 static struct hc_driver dummy_hcd = { 2552 .description = (char *) driver_name, 2553 .product_desc = "Dummy host controller", 2554 .hcd_priv_size = sizeof(struct dummy_hcd), 2555 2556 .flags = HCD_USB3 | HCD_SHARED, 2557 2558 .reset = dummy_setup, 2559 .start = dummy_start, 2560 .stop = dummy_stop, 2561 2562 .urb_enqueue = dummy_urb_enqueue, 2563 .urb_dequeue = dummy_urb_dequeue, 2564 2565 .get_frame_number = dummy_h_get_frame, 2566 2567 .hub_status_data = dummy_hub_status, 2568 .hub_control = dummy_hub_control, 2569 .bus_suspend = dummy_bus_suspend, 2570 .bus_resume = dummy_bus_resume, 2571 2572 .alloc_streams = dummy_alloc_streams, 2573 .free_streams = dummy_free_streams, 2574 }; 2575 2576 static int dummy_hcd_probe(struct platform_device *pdev) 2577 { 2578 struct dummy *dum; 2579 struct usb_hcd *hs_hcd; 2580 struct usb_hcd *ss_hcd; 2581 int retval; 2582 2583 dev_info(&pdev->dev, "%s, driver " DRIVER_VERSION "\n", driver_desc); 2584 dum = *((void **)dev_get_platdata(&pdev->dev)); 2585 2586 if (!mod_data.is_super_speed) 2587 dummy_hcd.flags = HCD_USB2; 2588 hs_hcd = usb_create_hcd(&dummy_hcd, &pdev->dev, dev_name(&pdev->dev)); 2589 if (!hs_hcd) 2590 return -ENOMEM; 2591 hs_hcd->has_tt = 1; 2592 2593 retval = usb_add_hcd(hs_hcd, 0, 0); 2594 if (retval) 2595 goto put_usb2_hcd; 2596 2597 if (mod_data.is_super_speed) { 2598 ss_hcd = usb_create_shared_hcd(&dummy_hcd, &pdev->dev, 2599 dev_name(&pdev->dev), hs_hcd); 2600 if (!ss_hcd) { 2601 retval = -ENOMEM; 2602 goto dealloc_usb2_hcd; 2603 } 2604 2605 retval = usb_add_hcd(ss_hcd, 0, 0); 2606 if (retval) 2607 goto put_usb3_hcd; 2608 } 2609 return 0; 2610 2611 put_usb3_hcd: 2612 usb_put_hcd(ss_hcd); 2613 dealloc_usb2_hcd: 2614 usb_remove_hcd(hs_hcd); 2615 put_usb2_hcd: 2616 usb_put_hcd(hs_hcd); 2617 dum->hs_hcd = dum->ss_hcd = NULL; 2618 return retval; 2619 } 2620 2621 static int dummy_hcd_remove(struct platform_device *pdev) 2622 { 2623 struct dummy *dum; 2624 2625 dum = hcd_to_dummy_hcd(platform_get_drvdata(pdev))->dum; 2626 2627 if (dum->ss_hcd) { 2628 usb_remove_hcd(dummy_hcd_to_hcd(dum->ss_hcd)); 2629 usb_put_hcd(dummy_hcd_to_hcd(dum->ss_hcd)); 2630 } 2631 2632 usb_remove_hcd(dummy_hcd_to_hcd(dum->hs_hcd)); 2633 usb_put_hcd(dummy_hcd_to_hcd(dum->hs_hcd)); 2634 2635 dum->hs_hcd = NULL; 2636 dum->ss_hcd = NULL; 2637 2638 return 0; 2639 } 2640 2641 static int dummy_hcd_suspend(struct platform_device *pdev, pm_message_t state) 2642 { 2643 struct usb_hcd *hcd; 2644 struct dummy_hcd *dum_hcd; 2645 int rc = 0; 2646 2647 dev_dbg(&pdev->dev, "%s\n", __func__); 2648 2649 hcd = platform_get_drvdata(pdev); 2650 dum_hcd = hcd_to_dummy_hcd(hcd); 2651 if (dum_hcd->rh_state == DUMMY_RH_RUNNING) { 2652 dev_warn(&pdev->dev, "Root hub isn't suspended!\n"); 2653 rc = -EBUSY; 2654 } else 2655 clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags); 2656 return rc; 2657 } 2658 2659 static int dummy_hcd_resume(struct platform_device *pdev) 2660 { 2661 struct usb_hcd *hcd; 2662 2663 dev_dbg(&pdev->dev, "%s\n", __func__); 2664 2665 hcd = platform_get_drvdata(pdev); 2666 set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags); 2667 usb_hcd_poll_rh_status(hcd); 2668 return 0; 2669 } 2670 2671 static struct platform_driver dummy_hcd_driver = { 2672 .probe = dummy_hcd_probe, 2673 .remove = dummy_hcd_remove, 2674 .suspend = dummy_hcd_suspend, 2675 .resume = dummy_hcd_resume, 2676 .driver = { 2677 .name = (char *) driver_name, 2678 }, 2679 }; 2680 2681 /*-------------------------------------------------------------------------*/ 2682 #define MAX_NUM_UDC 2 2683 static struct platform_device *the_udc_pdev[MAX_NUM_UDC]; 2684 static struct platform_device *the_hcd_pdev[MAX_NUM_UDC]; 2685 2686 static int __init init(void) 2687 { 2688 int retval = -ENOMEM; 2689 int i; 2690 struct dummy *dum[MAX_NUM_UDC]; 2691 2692 if (usb_disabled()) 2693 return -ENODEV; 2694 2695 if (!mod_data.is_high_speed && mod_data.is_super_speed) 2696 return -EINVAL; 2697 2698 if (mod_data.num < 1 || mod_data.num > MAX_NUM_UDC) { 2699 pr_err("Number of emulated UDC must be in range of 1...%d\n", 2700 MAX_NUM_UDC); 2701 return -EINVAL; 2702 } 2703 2704 for (i = 0; i < mod_data.num; i++) { 2705 the_hcd_pdev[i] = platform_device_alloc(driver_name, i); 2706 if (!the_hcd_pdev[i]) { 2707 i--; 2708 while (i >= 0) 2709 platform_device_put(the_hcd_pdev[i--]); 2710 return retval; 2711 } 2712 } 2713 for (i = 0; i < mod_data.num; i++) { 2714 the_udc_pdev[i] = platform_device_alloc(gadget_name, i); 2715 if (!the_udc_pdev[i]) { 2716 i--; 2717 while (i >= 0) 2718 platform_device_put(the_udc_pdev[i--]); 2719 goto err_alloc_udc; 2720 } 2721 } 2722 for (i = 0; i < mod_data.num; i++) { 2723 dum[i] = kzalloc(sizeof(struct dummy), GFP_KERNEL); 2724 if (!dum[i]) { 2725 retval = -ENOMEM; 2726 goto err_add_pdata; 2727 } 2728 retval = platform_device_add_data(the_hcd_pdev[i], &dum[i], 2729 sizeof(void *)); 2730 if (retval) 2731 goto err_add_pdata; 2732 retval = platform_device_add_data(the_udc_pdev[i], &dum[i], 2733 sizeof(void *)); 2734 if (retval) 2735 goto err_add_pdata; 2736 } 2737 2738 retval = platform_driver_register(&dummy_hcd_driver); 2739 if (retval < 0) 2740 goto err_add_pdata; 2741 retval = platform_driver_register(&dummy_udc_driver); 2742 if (retval < 0) 2743 goto err_register_udc_driver; 2744 2745 for (i = 0; i < mod_data.num; i++) { 2746 retval = platform_device_add(the_hcd_pdev[i]); 2747 if (retval < 0) { 2748 i--; 2749 while (i >= 0) 2750 platform_device_del(the_hcd_pdev[i--]); 2751 goto err_add_hcd; 2752 } 2753 } 2754 for (i = 0; i < mod_data.num; i++) { 2755 if (!dum[i]->hs_hcd || 2756 (!dum[i]->ss_hcd && mod_data.is_super_speed)) { 2757 /* 2758 * The hcd was added successfully but its probe 2759 * function failed for some reason. 2760 */ 2761 retval = -EINVAL; 2762 goto err_add_udc; 2763 } 2764 } 2765 2766 for (i = 0; i < mod_data.num; i++) { 2767 retval = platform_device_add(the_udc_pdev[i]); 2768 if (retval < 0) { 2769 i--; 2770 while (i >= 0) 2771 platform_device_del(the_udc_pdev[i]); 2772 goto err_add_udc; 2773 } 2774 } 2775 2776 for (i = 0; i < mod_data.num; i++) { 2777 if (!platform_get_drvdata(the_udc_pdev[i])) { 2778 /* 2779 * The udc was added successfully but its probe 2780 * function failed for some reason. 2781 */ 2782 retval = -EINVAL; 2783 goto err_probe_udc; 2784 } 2785 } 2786 return retval; 2787 2788 err_probe_udc: 2789 for (i = 0; i < mod_data.num; i++) 2790 platform_device_del(the_udc_pdev[i]); 2791 err_add_udc: 2792 for (i = 0; i < mod_data.num; i++) 2793 platform_device_del(the_hcd_pdev[i]); 2794 err_add_hcd: 2795 platform_driver_unregister(&dummy_udc_driver); 2796 err_register_udc_driver: 2797 platform_driver_unregister(&dummy_hcd_driver); 2798 err_add_pdata: 2799 for (i = 0; i < mod_data.num; i++) 2800 kfree(dum[i]); 2801 for (i = 0; i < mod_data.num; i++) 2802 platform_device_put(the_udc_pdev[i]); 2803 err_alloc_udc: 2804 for (i = 0; i < mod_data.num; i++) 2805 platform_device_put(the_hcd_pdev[i]); 2806 return retval; 2807 } 2808 module_init(init); 2809 2810 static void __exit cleanup(void) 2811 { 2812 int i; 2813 2814 for (i = 0; i < mod_data.num; i++) { 2815 struct dummy *dum; 2816 2817 dum = *((void **)dev_get_platdata(&the_udc_pdev[i]->dev)); 2818 2819 platform_device_unregister(the_udc_pdev[i]); 2820 platform_device_unregister(the_hcd_pdev[i]); 2821 kfree(dum); 2822 } 2823 platform_driver_unregister(&dummy_udc_driver); 2824 platform_driver_unregister(&dummy_hcd_driver); 2825 } 2826 module_exit(cleanup); 2827