1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * dummy_hcd.c -- Dummy/Loopback USB host and device emulator driver. 4 * 5 * Maintainer: Alan Stern <stern@rowland.harvard.edu> 6 * 7 * Copyright (C) 2003 David Brownell 8 * Copyright (C) 2003-2005 Alan Stern 9 */ 10 11 12 /* 13 * This exposes a device side "USB gadget" API, driven by requests to a 14 * Linux-USB host controller driver. USB traffic is simulated; there's 15 * no need for USB hardware. Use this with two other drivers: 16 * 17 * - Gadget driver, responding to requests (slave); 18 * - Host-side device driver, as already familiar in Linux. 19 * 20 * Having this all in one kernel can help some stages of development, 21 * bypassing some hardware (and driver) issues. UML could help too. 22 * 23 * Note: The emulation does not include isochronous transfers! 24 */ 25 26 #include <linux/module.h> 27 #include <linux/kernel.h> 28 #include <linux/delay.h> 29 #include <linux/ioport.h> 30 #include <linux/slab.h> 31 #include <linux/errno.h> 32 #include <linux/init.h> 33 #include <linux/timer.h> 34 #include <linux/list.h> 35 #include <linux/interrupt.h> 36 #include <linux/platform_device.h> 37 #include <linux/usb.h> 38 #include <linux/usb/gadget.h> 39 #include <linux/usb/hcd.h> 40 #include <linux/scatterlist.h> 41 42 #include <asm/byteorder.h> 43 #include <linux/io.h> 44 #include <asm/irq.h> 45 #include <asm/unaligned.h> 46 47 #define DRIVER_DESC "USB Host+Gadget Emulator" 48 #define DRIVER_VERSION "02 May 2005" 49 50 #define POWER_BUDGET 500 /* in mA; use 8 for low-power port testing */ 51 52 static const char driver_name[] = "dummy_hcd"; 53 static const char driver_desc[] = "USB Host+Gadget Emulator"; 54 55 static const char gadget_name[] = "dummy_udc"; 56 57 MODULE_DESCRIPTION(DRIVER_DESC); 58 MODULE_AUTHOR("David Brownell"); 59 MODULE_LICENSE("GPL"); 60 61 struct dummy_hcd_module_parameters { 62 bool is_super_speed; 63 bool is_high_speed; 64 unsigned int num; 65 }; 66 67 static struct dummy_hcd_module_parameters mod_data = { 68 .is_super_speed = false, 69 .is_high_speed = true, 70 .num = 1, 71 }; 72 module_param_named(is_super_speed, mod_data.is_super_speed, bool, S_IRUGO); 73 MODULE_PARM_DESC(is_super_speed, "true to simulate SuperSpeed connection"); 74 module_param_named(is_high_speed, mod_data.is_high_speed, bool, S_IRUGO); 75 MODULE_PARM_DESC(is_high_speed, "true to simulate HighSpeed connection"); 76 module_param_named(num, mod_data.num, uint, S_IRUGO); 77 MODULE_PARM_DESC(num, "number of emulated controllers"); 78 /*-------------------------------------------------------------------------*/ 79 80 /* gadget side driver data structres */ 81 struct dummy_ep { 82 struct list_head queue; 83 unsigned long last_io; /* jiffies timestamp */ 84 struct usb_gadget *gadget; 85 const struct usb_endpoint_descriptor *desc; 86 struct usb_ep ep; 87 unsigned halted:1; 88 unsigned wedged:1; 89 unsigned already_seen:1; 90 unsigned setup_stage:1; 91 unsigned stream_en:1; 92 }; 93 94 struct dummy_request { 95 struct list_head queue; /* ep's requests */ 96 struct usb_request req; 97 }; 98 99 static inline struct dummy_ep *usb_ep_to_dummy_ep(struct usb_ep *_ep) 100 { 101 return container_of(_ep, struct dummy_ep, ep); 102 } 103 104 static inline struct dummy_request *usb_request_to_dummy_request 105 (struct usb_request *_req) 106 { 107 return container_of(_req, struct dummy_request, req); 108 } 109 110 /*-------------------------------------------------------------------------*/ 111 112 /* 113 * Every device has ep0 for control requests, plus up to 30 more endpoints, 114 * in one of two types: 115 * 116 * - Configurable: direction (in/out), type (bulk, iso, etc), and endpoint 117 * number can be changed. Names like "ep-a" are used for this type. 118 * 119 * - Fixed Function: in other cases. some characteristics may be mutable; 120 * that'd be hardware-specific. Names like "ep12out-bulk" are used. 121 * 122 * Gadget drivers are responsible for not setting up conflicting endpoint 123 * configurations, illegal or unsupported packet lengths, and so on. 124 */ 125 126 static const char ep0name[] = "ep0"; 127 128 static const struct { 129 const char *name; 130 const struct usb_ep_caps caps; 131 } ep_info[] = { 132 #define EP_INFO(_name, _caps) \ 133 { \ 134 .name = _name, \ 135 .caps = _caps, \ 136 } 137 138 /* we don't provide isochronous endpoints since we don't support them */ 139 #define TYPE_BULK_OR_INT (USB_EP_CAPS_TYPE_BULK | USB_EP_CAPS_TYPE_INT) 140 141 /* everyone has ep0 */ 142 EP_INFO(ep0name, 143 USB_EP_CAPS(USB_EP_CAPS_TYPE_CONTROL, USB_EP_CAPS_DIR_ALL)), 144 /* act like a pxa250: fifteen fixed function endpoints */ 145 EP_INFO("ep1in-bulk", 146 USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, USB_EP_CAPS_DIR_IN)), 147 EP_INFO("ep2out-bulk", 148 USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, USB_EP_CAPS_DIR_OUT)), 149 /* 150 EP_INFO("ep3in-iso", 151 USB_EP_CAPS(USB_EP_CAPS_TYPE_ISO, USB_EP_CAPS_DIR_IN)), 152 EP_INFO("ep4out-iso", 153 USB_EP_CAPS(USB_EP_CAPS_TYPE_ISO, USB_EP_CAPS_DIR_OUT)), 154 */ 155 EP_INFO("ep5in-int", 156 USB_EP_CAPS(USB_EP_CAPS_TYPE_INT, USB_EP_CAPS_DIR_IN)), 157 EP_INFO("ep6in-bulk", 158 USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, USB_EP_CAPS_DIR_IN)), 159 EP_INFO("ep7out-bulk", 160 USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, USB_EP_CAPS_DIR_OUT)), 161 /* 162 EP_INFO("ep8in-iso", 163 USB_EP_CAPS(USB_EP_CAPS_TYPE_ISO, USB_EP_CAPS_DIR_IN)), 164 EP_INFO("ep9out-iso", 165 USB_EP_CAPS(USB_EP_CAPS_TYPE_ISO, USB_EP_CAPS_DIR_OUT)), 166 */ 167 EP_INFO("ep10in-int", 168 USB_EP_CAPS(USB_EP_CAPS_TYPE_INT, USB_EP_CAPS_DIR_IN)), 169 EP_INFO("ep11in-bulk", 170 USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, USB_EP_CAPS_DIR_IN)), 171 EP_INFO("ep12out-bulk", 172 USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, USB_EP_CAPS_DIR_OUT)), 173 /* 174 EP_INFO("ep13in-iso", 175 USB_EP_CAPS(USB_EP_CAPS_TYPE_ISO, USB_EP_CAPS_DIR_IN)), 176 EP_INFO("ep14out-iso", 177 USB_EP_CAPS(USB_EP_CAPS_TYPE_ISO, USB_EP_CAPS_DIR_OUT)), 178 */ 179 EP_INFO("ep15in-int", 180 USB_EP_CAPS(USB_EP_CAPS_TYPE_INT, USB_EP_CAPS_DIR_IN)), 181 182 /* or like sa1100: two fixed function endpoints */ 183 EP_INFO("ep1out-bulk", 184 USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, USB_EP_CAPS_DIR_OUT)), 185 EP_INFO("ep2in-bulk", 186 USB_EP_CAPS(USB_EP_CAPS_TYPE_BULK, USB_EP_CAPS_DIR_IN)), 187 188 /* and now some generic EPs so we have enough in multi config */ 189 EP_INFO("ep3out", 190 USB_EP_CAPS(TYPE_BULK_OR_INT, USB_EP_CAPS_DIR_OUT)), 191 EP_INFO("ep4in", 192 USB_EP_CAPS(TYPE_BULK_OR_INT, USB_EP_CAPS_DIR_IN)), 193 EP_INFO("ep5out", 194 USB_EP_CAPS(TYPE_BULK_OR_INT, USB_EP_CAPS_DIR_OUT)), 195 EP_INFO("ep6out", 196 USB_EP_CAPS(TYPE_BULK_OR_INT, USB_EP_CAPS_DIR_OUT)), 197 EP_INFO("ep7in", 198 USB_EP_CAPS(TYPE_BULK_OR_INT, USB_EP_CAPS_DIR_IN)), 199 EP_INFO("ep8out", 200 USB_EP_CAPS(TYPE_BULK_OR_INT, USB_EP_CAPS_DIR_OUT)), 201 EP_INFO("ep9in", 202 USB_EP_CAPS(TYPE_BULK_OR_INT, USB_EP_CAPS_DIR_IN)), 203 EP_INFO("ep10out", 204 USB_EP_CAPS(TYPE_BULK_OR_INT, USB_EP_CAPS_DIR_OUT)), 205 EP_INFO("ep11out", 206 USB_EP_CAPS(TYPE_BULK_OR_INT, USB_EP_CAPS_DIR_OUT)), 207 EP_INFO("ep12in", 208 USB_EP_CAPS(TYPE_BULK_OR_INT, USB_EP_CAPS_DIR_IN)), 209 EP_INFO("ep13out", 210 USB_EP_CAPS(TYPE_BULK_OR_INT, USB_EP_CAPS_DIR_OUT)), 211 EP_INFO("ep14in", 212 USB_EP_CAPS(TYPE_BULK_OR_INT, USB_EP_CAPS_DIR_IN)), 213 EP_INFO("ep15out", 214 USB_EP_CAPS(TYPE_BULK_OR_INT, USB_EP_CAPS_DIR_OUT)), 215 216 #undef EP_INFO 217 }; 218 219 #define DUMMY_ENDPOINTS ARRAY_SIZE(ep_info) 220 221 /*-------------------------------------------------------------------------*/ 222 223 #define FIFO_SIZE 64 224 225 struct urbp { 226 struct urb *urb; 227 struct list_head urbp_list; 228 struct sg_mapping_iter miter; 229 u32 miter_started; 230 }; 231 232 233 enum dummy_rh_state { 234 DUMMY_RH_RESET, 235 DUMMY_RH_SUSPENDED, 236 DUMMY_RH_RUNNING 237 }; 238 239 struct dummy_hcd { 240 struct dummy *dum; 241 enum dummy_rh_state rh_state; 242 struct timer_list timer; 243 u32 port_status; 244 u32 old_status; 245 unsigned long re_timeout; 246 247 struct usb_device *udev; 248 struct list_head urbp_list; 249 struct urbp *next_frame_urbp; 250 251 u32 stream_en_ep; 252 u8 num_stream[30 / 2]; 253 254 unsigned active:1; 255 unsigned old_active:1; 256 unsigned resuming:1; 257 }; 258 259 struct dummy { 260 spinlock_t lock; 261 262 /* 263 * SLAVE/GADGET side support 264 */ 265 struct dummy_ep ep[DUMMY_ENDPOINTS]; 266 int address; 267 int callback_usage; 268 struct usb_gadget gadget; 269 struct usb_gadget_driver *driver; 270 struct dummy_request fifo_req; 271 u8 fifo_buf[FIFO_SIZE]; 272 u16 devstatus; 273 unsigned ints_enabled:1; 274 unsigned udc_suspended:1; 275 unsigned pullup:1; 276 277 /* 278 * MASTER/HOST side support 279 */ 280 struct dummy_hcd *hs_hcd; 281 struct dummy_hcd *ss_hcd; 282 }; 283 284 static inline struct dummy_hcd *hcd_to_dummy_hcd(struct usb_hcd *hcd) 285 { 286 return (struct dummy_hcd *) (hcd->hcd_priv); 287 } 288 289 static inline struct usb_hcd *dummy_hcd_to_hcd(struct dummy_hcd *dum) 290 { 291 return container_of((void *) dum, struct usb_hcd, hcd_priv); 292 } 293 294 static inline struct device *dummy_dev(struct dummy_hcd *dum) 295 { 296 return dummy_hcd_to_hcd(dum)->self.controller; 297 } 298 299 static inline struct device *udc_dev(struct dummy *dum) 300 { 301 return dum->gadget.dev.parent; 302 } 303 304 static inline struct dummy *ep_to_dummy(struct dummy_ep *ep) 305 { 306 return container_of(ep->gadget, struct dummy, gadget); 307 } 308 309 static inline struct dummy_hcd *gadget_to_dummy_hcd(struct usb_gadget *gadget) 310 { 311 struct dummy *dum = container_of(gadget, struct dummy, gadget); 312 if (dum->gadget.speed == USB_SPEED_SUPER) 313 return dum->ss_hcd; 314 else 315 return dum->hs_hcd; 316 } 317 318 static inline struct dummy *gadget_dev_to_dummy(struct device *dev) 319 { 320 return container_of(dev, struct dummy, gadget.dev); 321 } 322 323 /*-------------------------------------------------------------------------*/ 324 325 /* SLAVE/GADGET SIDE UTILITY ROUTINES */ 326 327 /* called with spinlock held */ 328 static void nuke(struct dummy *dum, struct dummy_ep *ep) 329 { 330 while (!list_empty(&ep->queue)) { 331 struct dummy_request *req; 332 333 req = list_entry(ep->queue.next, struct dummy_request, queue); 334 list_del_init(&req->queue); 335 req->req.status = -ESHUTDOWN; 336 337 spin_unlock(&dum->lock); 338 usb_gadget_giveback_request(&ep->ep, &req->req); 339 spin_lock(&dum->lock); 340 } 341 } 342 343 /* caller must hold lock */ 344 static void stop_activity(struct dummy *dum) 345 { 346 int i; 347 348 /* prevent any more requests */ 349 dum->address = 0; 350 351 /* The timer is left running so that outstanding URBs can fail */ 352 353 /* nuke any pending requests first, so driver i/o is quiesced */ 354 for (i = 0; i < DUMMY_ENDPOINTS; ++i) 355 nuke(dum, &dum->ep[i]); 356 357 /* driver now does any non-usb quiescing necessary */ 358 } 359 360 /** 361 * set_link_state_by_speed() - Sets the current state of the link according to 362 * the hcd speed 363 * @dum_hcd: pointer to the dummy_hcd structure to update the link state for 364 * 365 * This function updates the port_status according to the link state and the 366 * speed of the hcd. 367 */ 368 static void set_link_state_by_speed(struct dummy_hcd *dum_hcd) 369 { 370 struct dummy *dum = dum_hcd->dum; 371 372 if (dummy_hcd_to_hcd(dum_hcd)->speed == HCD_USB3) { 373 if ((dum_hcd->port_status & USB_SS_PORT_STAT_POWER) == 0) { 374 dum_hcd->port_status = 0; 375 } else if (!dum->pullup || dum->udc_suspended) { 376 /* UDC suspend must cause a disconnect */ 377 dum_hcd->port_status &= ~(USB_PORT_STAT_CONNECTION | 378 USB_PORT_STAT_ENABLE); 379 if ((dum_hcd->old_status & 380 USB_PORT_STAT_CONNECTION) != 0) 381 dum_hcd->port_status |= 382 (USB_PORT_STAT_C_CONNECTION << 16); 383 } else { 384 /* device is connected and not suspended */ 385 dum_hcd->port_status |= (USB_PORT_STAT_CONNECTION | 386 USB_PORT_STAT_SPEED_5GBPS) ; 387 if ((dum_hcd->old_status & 388 USB_PORT_STAT_CONNECTION) == 0) 389 dum_hcd->port_status |= 390 (USB_PORT_STAT_C_CONNECTION << 16); 391 if ((dum_hcd->port_status & USB_PORT_STAT_ENABLE) && 392 (dum_hcd->port_status & 393 USB_PORT_STAT_LINK_STATE) == USB_SS_PORT_LS_U0 && 394 dum_hcd->rh_state != DUMMY_RH_SUSPENDED) 395 dum_hcd->active = 1; 396 } 397 } else { 398 if ((dum_hcd->port_status & USB_PORT_STAT_POWER) == 0) { 399 dum_hcd->port_status = 0; 400 } else if (!dum->pullup || dum->udc_suspended) { 401 /* UDC suspend must cause a disconnect */ 402 dum_hcd->port_status &= ~(USB_PORT_STAT_CONNECTION | 403 USB_PORT_STAT_ENABLE | 404 USB_PORT_STAT_LOW_SPEED | 405 USB_PORT_STAT_HIGH_SPEED | 406 USB_PORT_STAT_SUSPEND); 407 if ((dum_hcd->old_status & 408 USB_PORT_STAT_CONNECTION) != 0) 409 dum_hcd->port_status |= 410 (USB_PORT_STAT_C_CONNECTION << 16); 411 } else { 412 dum_hcd->port_status |= USB_PORT_STAT_CONNECTION; 413 if ((dum_hcd->old_status & 414 USB_PORT_STAT_CONNECTION) == 0) 415 dum_hcd->port_status |= 416 (USB_PORT_STAT_C_CONNECTION << 16); 417 if ((dum_hcd->port_status & USB_PORT_STAT_ENABLE) == 0) 418 dum_hcd->port_status &= ~USB_PORT_STAT_SUSPEND; 419 else if ((dum_hcd->port_status & 420 USB_PORT_STAT_SUSPEND) == 0 && 421 dum_hcd->rh_state != DUMMY_RH_SUSPENDED) 422 dum_hcd->active = 1; 423 } 424 } 425 } 426 427 /* caller must hold lock */ 428 static void set_link_state(struct dummy_hcd *dum_hcd) 429 { 430 struct dummy *dum = dum_hcd->dum; 431 unsigned int power_bit; 432 433 dum_hcd->active = 0; 434 if (dum->pullup) 435 if ((dummy_hcd_to_hcd(dum_hcd)->speed == HCD_USB3 && 436 dum->gadget.speed != USB_SPEED_SUPER) || 437 (dummy_hcd_to_hcd(dum_hcd)->speed != HCD_USB3 && 438 dum->gadget.speed == USB_SPEED_SUPER)) 439 return; 440 441 set_link_state_by_speed(dum_hcd); 442 power_bit = (dummy_hcd_to_hcd(dum_hcd)->speed == HCD_USB3 ? 443 USB_SS_PORT_STAT_POWER : USB_PORT_STAT_POWER); 444 445 if ((dum_hcd->port_status & USB_PORT_STAT_ENABLE) == 0 || 446 dum_hcd->active) 447 dum_hcd->resuming = 0; 448 449 /* Currently !connected or in reset */ 450 if ((dum_hcd->port_status & power_bit) == 0 || 451 (dum_hcd->port_status & USB_PORT_STAT_RESET) != 0) { 452 unsigned int disconnect = power_bit & 453 dum_hcd->old_status & (~dum_hcd->port_status); 454 unsigned int reset = USB_PORT_STAT_RESET & 455 (~dum_hcd->old_status) & dum_hcd->port_status; 456 457 /* Report reset and disconnect events to the driver */ 458 if (dum->ints_enabled && (disconnect || reset)) { 459 stop_activity(dum); 460 ++dum->callback_usage; 461 spin_unlock(&dum->lock); 462 if (reset) 463 usb_gadget_udc_reset(&dum->gadget, dum->driver); 464 else 465 dum->driver->disconnect(&dum->gadget); 466 spin_lock(&dum->lock); 467 --dum->callback_usage; 468 } 469 } else if (dum_hcd->active != dum_hcd->old_active && 470 dum->ints_enabled) { 471 ++dum->callback_usage; 472 spin_unlock(&dum->lock); 473 if (dum_hcd->old_active && dum->driver->suspend) 474 dum->driver->suspend(&dum->gadget); 475 else if (!dum_hcd->old_active && dum->driver->resume) 476 dum->driver->resume(&dum->gadget); 477 spin_lock(&dum->lock); 478 --dum->callback_usage; 479 } 480 481 dum_hcd->old_status = dum_hcd->port_status; 482 dum_hcd->old_active = dum_hcd->active; 483 } 484 485 /*-------------------------------------------------------------------------*/ 486 487 /* SLAVE/GADGET SIDE DRIVER 488 * 489 * This only tracks gadget state. All the work is done when the host 490 * side tries some (emulated) i/o operation. Real device controller 491 * drivers would do real i/o using dma, fifos, irqs, timers, etc. 492 */ 493 494 #define is_enabled(dum) \ 495 (dum->port_status & USB_PORT_STAT_ENABLE) 496 497 static int dummy_enable(struct usb_ep *_ep, 498 const struct usb_endpoint_descriptor *desc) 499 { 500 struct dummy *dum; 501 struct dummy_hcd *dum_hcd; 502 struct dummy_ep *ep; 503 unsigned max; 504 int retval; 505 506 ep = usb_ep_to_dummy_ep(_ep); 507 if (!_ep || !desc || ep->desc || _ep->name == ep0name 508 || desc->bDescriptorType != USB_DT_ENDPOINT) 509 return -EINVAL; 510 dum = ep_to_dummy(ep); 511 if (!dum->driver) 512 return -ESHUTDOWN; 513 514 dum_hcd = gadget_to_dummy_hcd(&dum->gadget); 515 if (!is_enabled(dum_hcd)) 516 return -ESHUTDOWN; 517 518 /* 519 * For HS/FS devices only bits 0..10 of the wMaxPacketSize represent the 520 * maximum packet size. 521 * For SS devices the wMaxPacketSize is limited by 1024. 522 */ 523 max = usb_endpoint_maxp(desc); 524 525 /* drivers must not request bad settings, since lower levels 526 * (hardware or its drivers) may not check. some endpoints 527 * can't do iso, many have maxpacket limitations, etc. 528 * 529 * since this "hardware" driver is here to help debugging, we 530 * have some extra sanity checks. (there could be more though, 531 * especially for "ep9out" style fixed function ones.) 532 */ 533 retval = -EINVAL; 534 switch (usb_endpoint_type(desc)) { 535 case USB_ENDPOINT_XFER_BULK: 536 if (strstr(ep->ep.name, "-iso") 537 || strstr(ep->ep.name, "-int")) { 538 goto done; 539 } 540 switch (dum->gadget.speed) { 541 case USB_SPEED_SUPER: 542 if (max == 1024) 543 break; 544 goto done; 545 case USB_SPEED_HIGH: 546 if (max == 512) 547 break; 548 goto done; 549 case USB_SPEED_FULL: 550 if (max == 8 || max == 16 || max == 32 || max == 64) 551 /* we'll fake any legal size */ 552 break; 553 /* save a return statement */ 554 default: 555 goto done; 556 } 557 break; 558 case USB_ENDPOINT_XFER_INT: 559 if (strstr(ep->ep.name, "-iso")) /* bulk is ok */ 560 goto done; 561 /* real hardware might not handle all packet sizes */ 562 switch (dum->gadget.speed) { 563 case USB_SPEED_SUPER: 564 case USB_SPEED_HIGH: 565 if (max <= 1024) 566 break; 567 /* save a return statement */ 568 /* fall through */ 569 case USB_SPEED_FULL: 570 if (max <= 64) 571 break; 572 /* save a return statement */ 573 /* fall through */ 574 default: 575 if (max <= 8) 576 break; 577 goto done; 578 } 579 break; 580 case USB_ENDPOINT_XFER_ISOC: 581 if (strstr(ep->ep.name, "-bulk") 582 || strstr(ep->ep.name, "-int")) 583 goto done; 584 /* real hardware might not handle all packet sizes */ 585 switch (dum->gadget.speed) { 586 case USB_SPEED_SUPER: 587 case USB_SPEED_HIGH: 588 if (max <= 1024) 589 break; 590 /* save a return statement */ 591 /* fall through */ 592 case USB_SPEED_FULL: 593 if (max <= 1023) 594 break; 595 /* save a return statement */ 596 default: 597 goto done; 598 } 599 break; 600 default: 601 /* few chips support control except on ep0 */ 602 goto done; 603 } 604 605 _ep->maxpacket = max; 606 if (usb_ss_max_streams(_ep->comp_desc)) { 607 if (!usb_endpoint_xfer_bulk(desc)) { 608 dev_err(udc_dev(dum), "Can't enable stream support on " 609 "non-bulk ep %s\n", _ep->name); 610 return -EINVAL; 611 } 612 ep->stream_en = 1; 613 } 614 ep->desc = desc; 615 616 dev_dbg(udc_dev(dum), "enabled %s (ep%d%s-%s) maxpacket %d stream %s\n", 617 _ep->name, 618 desc->bEndpointAddress & 0x0f, 619 (desc->bEndpointAddress & USB_DIR_IN) ? "in" : "out", 620 ({ char *val; 621 switch (usb_endpoint_type(desc)) { 622 case USB_ENDPOINT_XFER_BULK: 623 val = "bulk"; 624 break; 625 case USB_ENDPOINT_XFER_ISOC: 626 val = "iso"; 627 break; 628 case USB_ENDPOINT_XFER_INT: 629 val = "intr"; 630 break; 631 default: 632 val = "ctrl"; 633 break; 634 } val; }), 635 max, ep->stream_en ? "enabled" : "disabled"); 636 637 /* at this point real hardware should be NAKing transfers 638 * to that endpoint, until a buffer is queued to it. 639 */ 640 ep->halted = ep->wedged = 0; 641 retval = 0; 642 done: 643 return retval; 644 } 645 646 static int dummy_disable(struct usb_ep *_ep) 647 { 648 struct dummy_ep *ep; 649 struct dummy *dum; 650 unsigned long flags; 651 652 ep = usb_ep_to_dummy_ep(_ep); 653 if (!_ep || !ep->desc || _ep->name == ep0name) 654 return -EINVAL; 655 dum = ep_to_dummy(ep); 656 657 spin_lock_irqsave(&dum->lock, flags); 658 ep->desc = NULL; 659 ep->stream_en = 0; 660 nuke(dum, ep); 661 spin_unlock_irqrestore(&dum->lock, flags); 662 663 dev_dbg(udc_dev(dum), "disabled %s\n", _ep->name); 664 return 0; 665 } 666 667 static struct usb_request *dummy_alloc_request(struct usb_ep *_ep, 668 gfp_t mem_flags) 669 { 670 struct dummy_request *req; 671 672 if (!_ep) 673 return NULL; 674 675 req = kzalloc(sizeof(*req), mem_flags); 676 if (!req) 677 return NULL; 678 INIT_LIST_HEAD(&req->queue); 679 return &req->req; 680 } 681 682 static void dummy_free_request(struct usb_ep *_ep, struct usb_request *_req) 683 { 684 struct dummy_request *req; 685 686 if (!_ep || !_req) { 687 WARN_ON(1); 688 return; 689 } 690 691 req = usb_request_to_dummy_request(_req); 692 WARN_ON(!list_empty(&req->queue)); 693 kfree(req); 694 } 695 696 static void fifo_complete(struct usb_ep *ep, struct usb_request *req) 697 { 698 } 699 700 static int dummy_queue(struct usb_ep *_ep, struct usb_request *_req, 701 gfp_t mem_flags) 702 { 703 struct dummy_ep *ep; 704 struct dummy_request *req; 705 struct dummy *dum; 706 struct dummy_hcd *dum_hcd; 707 unsigned long flags; 708 709 req = usb_request_to_dummy_request(_req); 710 if (!_req || !list_empty(&req->queue) || !_req->complete) 711 return -EINVAL; 712 713 ep = usb_ep_to_dummy_ep(_ep); 714 if (!_ep || (!ep->desc && _ep->name != ep0name)) 715 return -EINVAL; 716 717 dum = ep_to_dummy(ep); 718 dum_hcd = gadget_to_dummy_hcd(&dum->gadget); 719 if (!dum->driver || !is_enabled(dum_hcd)) 720 return -ESHUTDOWN; 721 722 #if 0 723 dev_dbg(udc_dev(dum), "ep %p queue req %p to %s, len %d buf %p\n", 724 ep, _req, _ep->name, _req->length, _req->buf); 725 #endif 726 _req->status = -EINPROGRESS; 727 _req->actual = 0; 728 spin_lock_irqsave(&dum->lock, flags); 729 730 /* implement an emulated single-request FIFO */ 731 if (ep->desc && (ep->desc->bEndpointAddress & USB_DIR_IN) && 732 list_empty(&dum->fifo_req.queue) && 733 list_empty(&ep->queue) && 734 _req->length <= FIFO_SIZE) { 735 req = &dum->fifo_req; 736 req->req = *_req; 737 req->req.buf = dum->fifo_buf; 738 memcpy(dum->fifo_buf, _req->buf, _req->length); 739 req->req.context = dum; 740 req->req.complete = fifo_complete; 741 742 list_add_tail(&req->queue, &ep->queue); 743 spin_unlock(&dum->lock); 744 _req->actual = _req->length; 745 _req->status = 0; 746 usb_gadget_giveback_request(_ep, _req); 747 spin_lock(&dum->lock); 748 } else 749 list_add_tail(&req->queue, &ep->queue); 750 spin_unlock_irqrestore(&dum->lock, flags); 751 752 /* real hardware would likely enable transfers here, in case 753 * it'd been left NAKing. 754 */ 755 return 0; 756 } 757 758 static int dummy_dequeue(struct usb_ep *_ep, struct usb_request *_req) 759 { 760 struct dummy_ep *ep; 761 struct dummy *dum; 762 int retval = -EINVAL; 763 unsigned long flags; 764 struct dummy_request *req = NULL; 765 766 if (!_ep || !_req) 767 return retval; 768 ep = usb_ep_to_dummy_ep(_ep); 769 dum = ep_to_dummy(ep); 770 771 if (!dum->driver) 772 return -ESHUTDOWN; 773 774 local_irq_save(flags); 775 spin_lock(&dum->lock); 776 list_for_each_entry(req, &ep->queue, queue) { 777 if (&req->req == _req) { 778 list_del_init(&req->queue); 779 _req->status = -ECONNRESET; 780 retval = 0; 781 break; 782 } 783 } 784 spin_unlock(&dum->lock); 785 786 if (retval == 0) { 787 dev_dbg(udc_dev(dum), 788 "dequeued req %p from %s, len %d buf %p\n", 789 req, _ep->name, _req->length, _req->buf); 790 usb_gadget_giveback_request(_ep, _req); 791 } 792 local_irq_restore(flags); 793 return retval; 794 } 795 796 static int 797 dummy_set_halt_and_wedge(struct usb_ep *_ep, int value, int wedged) 798 { 799 struct dummy_ep *ep; 800 struct dummy *dum; 801 802 if (!_ep) 803 return -EINVAL; 804 ep = usb_ep_to_dummy_ep(_ep); 805 dum = ep_to_dummy(ep); 806 if (!dum->driver) 807 return -ESHUTDOWN; 808 if (!value) 809 ep->halted = ep->wedged = 0; 810 else if (ep->desc && (ep->desc->bEndpointAddress & USB_DIR_IN) && 811 !list_empty(&ep->queue)) 812 return -EAGAIN; 813 else { 814 ep->halted = 1; 815 if (wedged) 816 ep->wedged = 1; 817 } 818 /* FIXME clear emulated data toggle too */ 819 return 0; 820 } 821 822 static int 823 dummy_set_halt(struct usb_ep *_ep, int value) 824 { 825 return dummy_set_halt_and_wedge(_ep, value, 0); 826 } 827 828 static int dummy_set_wedge(struct usb_ep *_ep) 829 { 830 if (!_ep || _ep->name == ep0name) 831 return -EINVAL; 832 return dummy_set_halt_and_wedge(_ep, 1, 1); 833 } 834 835 static const struct usb_ep_ops dummy_ep_ops = { 836 .enable = dummy_enable, 837 .disable = dummy_disable, 838 839 .alloc_request = dummy_alloc_request, 840 .free_request = dummy_free_request, 841 842 .queue = dummy_queue, 843 .dequeue = dummy_dequeue, 844 845 .set_halt = dummy_set_halt, 846 .set_wedge = dummy_set_wedge, 847 }; 848 849 /*-------------------------------------------------------------------------*/ 850 851 /* there are both host and device side versions of this call ... */ 852 static int dummy_g_get_frame(struct usb_gadget *_gadget) 853 { 854 struct timespec64 ts64; 855 856 ktime_get_ts64(&ts64); 857 return ts64.tv_nsec / NSEC_PER_MSEC; 858 } 859 860 static int dummy_wakeup(struct usb_gadget *_gadget) 861 { 862 struct dummy_hcd *dum_hcd; 863 864 dum_hcd = gadget_to_dummy_hcd(_gadget); 865 if (!(dum_hcd->dum->devstatus & ((1 << USB_DEVICE_B_HNP_ENABLE) 866 | (1 << USB_DEVICE_REMOTE_WAKEUP)))) 867 return -EINVAL; 868 if ((dum_hcd->port_status & USB_PORT_STAT_CONNECTION) == 0) 869 return -ENOLINK; 870 if ((dum_hcd->port_status & USB_PORT_STAT_SUSPEND) == 0 && 871 dum_hcd->rh_state != DUMMY_RH_SUSPENDED) 872 return -EIO; 873 874 /* FIXME: What if the root hub is suspended but the port isn't? */ 875 876 /* hub notices our request, issues downstream resume, etc */ 877 dum_hcd->resuming = 1; 878 dum_hcd->re_timeout = jiffies + msecs_to_jiffies(20); 879 mod_timer(&dummy_hcd_to_hcd(dum_hcd)->rh_timer, dum_hcd->re_timeout); 880 return 0; 881 } 882 883 static int dummy_set_selfpowered(struct usb_gadget *_gadget, int value) 884 { 885 struct dummy *dum; 886 887 _gadget->is_selfpowered = (value != 0); 888 dum = gadget_to_dummy_hcd(_gadget)->dum; 889 if (value) 890 dum->devstatus |= (1 << USB_DEVICE_SELF_POWERED); 891 else 892 dum->devstatus &= ~(1 << USB_DEVICE_SELF_POWERED); 893 return 0; 894 } 895 896 static void dummy_udc_update_ep0(struct dummy *dum) 897 { 898 if (dum->gadget.speed == USB_SPEED_SUPER) 899 dum->ep[0].ep.maxpacket = 9; 900 else 901 dum->ep[0].ep.maxpacket = 64; 902 } 903 904 static int dummy_pullup(struct usb_gadget *_gadget, int value) 905 { 906 struct dummy_hcd *dum_hcd; 907 struct dummy *dum; 908 unsigned long flags; 909 910 dum = gadget_dev_to_dummy(&_gadget->dev); 911 dum_hcd = gadget_to_dummy_hcd(_gadget); 912 913 spin_lock_irqsave(&dum->lock, flags); 914 dum->pullup = (value != 0); 915 set_link_state(dum_hcd); 916 spin_unlock_irqrestore(&dum->lock, flags); 917 918 usb_hcd_poll_rh_status(dummy_hcd_to_hcd(dum_hcd)); 919 return 0; 920 } 921 922 static void dummy_udc_set_speed(struct usb_gadget *_gadget, 923 enum usb_device_speed speed) 924 { 925 struct dummy *dum; 926 927 dum = gadget_dev_to_dummy(&_gadget->dev); 928 dum->gadget.speed = speed; 929 dummy_udc_update_ep0(dum); 930 } 931 932 static int dummy_udc_start(struct usb_gadget *g, 933 struct usb_gadget_driver *driver); 934 static int dummy_udc_stop(struct usb_gadget *g); 935 936 static const struct usb_gadget_ops dummy_ops = { 937 .get_frame = dummy_g_get_frame, 938 .wakeup = dummy_wakeup, 939 .set_selfpowered = dummy_set_selfpowered, 940 .pullup = dummy_pullup, 941 .udc_start = dummy_udc_start, 942 .udc_stop = dummy_udc_stop, 943 .udc_set_speed = dummy_udc_set_speed, 944 }; 945 946 /*-------------------------------------------------------------------------*/ 947 948 /* "function" sysfs attribute */ 949 static ssize_t function_show(struct device *dev, struct device_attribute *attr, 950 char *buf) 951 { 952 struct dummy *dum = gadget_dev_to_dummy(dev); 953 954 if (!dum->driver || !dum->driver->function) 955 return 0; 956 return scnprintf(buf, PAGE_SIZE, "%s\n", dum->driver->function); 957 } 958 static DEVICE_ATTR_RO(function); 959 960 /*-------------------------------------------------------------------------*/ 961 962 /* 963 * Driver registration/unregistration. 964 * 965 * This is basically hardware-specific; there's usually only one real USB 966 * device (not host) controller since that's how USB devices are intended 967 * to work. So most implementations of these api calls will rely on the 968 * fact that only one driver will ever bind to the hardware. But curious 969 * hardware can be built with discrete components, so the gadget API doesn't 970 * require that assumption. 971 * 972 * For this emulator, it might be convenient to create a usb slave device 973 * for each driver that registers: just add to a big root hub. 974 */ 975 976 static int dummy_udc_start(struct usb_gadget *g, 977 struct usb_gadget_driver *driver) 978 { 979 struct dummy_hcd *dum_hcd = gadget_to_dummy_hcd(g); 980 struct dummy *dum = dum_hcd->dum; 981 982 if (driver->max_speed == USB_SPEED_UNKNOWN) 983 return -EINVAL; 984 985 /* 986 * SLAVE side init ... the layer above hardware, which 987 * can't enumerate without help from the driver we're binding. 988 */ 989 990 spin_lock_irq(&dum->lock); 991 dum->devstatus = 0; 992 dum->driver = driver; 993 dum->ints_enabled = 1; 994 spin_unlock_irq(&dum->lock); 995 996 return 0; 997 } 998 999 static int dummy_udc_stop(struct usb_gadget *g) 1000 { 1001 struct dummy_hcd *dum_hcd = gadget_to_dummy_hcd(g); 1002 struct dummy *dum = dum_hcd->dum; 1003 1004 spin_lock_irq(&dum->lock); 1005 dum->ints_enabled = 0; 1006 stop_activity(dum); 1007 1008 /* emulate synchronize_irq(): wait for callbacks to finish */ 1009 while (dum->callback_usage > 0) { 1010 spin_unlock_irq(&dum->lock); 1011 usleep_range(1000, 2000); 1012 spin_lock_irq(&dum->lock); 1013 } 1014 1015 dum->driver = NULL; 1016 spin_unlock_irq(&dum->lock); 1017 1018 return 0; 1019 } 1020 1021 #undef is_enabled 1022 1023 /* The gadget structure is stored inside the hcd structure and will be 1024 * released along with it. */ 1025 static void init_dummy_udc_hw(struct dummy *dum) 1026 { 1027 int i; 1028 1029 INIT_LIST_HEAD(&dum->gadget.ep_list); 1030 for (i = 0; i < DUMMY_ENDPOINTS; i++) { 1031 struct dummy_ep *ep = &dum->ep[i]; 1032 1033 if (!ep_info[i].name) 1034 break; 1035 ep->ep.name = ep_info[i].name; 1036 ep->ep.caps = ep_info[i].caps; 1037 ep->ep.ops = &dummy_ep_ops; 1038 list_add_tail(&ep->ep.ep_list, &dum->gadget.ep_list); 1039 ep->halted = ep->wedged = ep->already_seen = 1040 ep->setup_stage = 0; 1041 usb_ep_set_maxpacket_limit(&ep->ep, ~0); 1042 ep->ep.max_streams = 16; 1043 ep->last_io = jiffies; 1044 ep->gadget = &dum->gadget; 1045 ep->desc = NULL; 1046 INIT_LIST_HEAD(&ep->queue); 1047 } 1048 1049 dum->gadget.ep0 = &dum->ep[0].ep; 1050 list_del_init(&dum->ep[0].ep.ep_list); 1051 INIT_LIST_HEAD(&dum->fifo_req.queue); 1052 1053 #ifdef CONFIG_USB_OTG 1054 dum->gadget.is_otg = 1; 1055 #endif 1056 } 1057 1058 static int dummy_udc_probe(struct platform_device *pdev) 1059 { 1060 struct dummy *dum; 1061 int rc; 1062 1063 dum = *((void **)dev_get_platdata(&pdev->dev)); 1064 /* Clear usb_gadget region for new registration to udc-core */ 1065 memzero_explicit(&dum->gadget, sizeof(struct usb_gadget)); 1066 dum->gadget.name = gadget_name; 1067 dum->gadget.ops = &dummy_ops; 1068 if (mod_data.is_super_speed) 1069 dum->gadget.max_speed = USB_SPEED_SUPER; 1070 else if (mod_data.is_high_speed) 1071 dum->gadget.max_speed = USB_SPEED_HIGH; 1072 else 1073 dum->gadget.max_speed = USB_SPEED_FULL; 1074 1075 dum->gadget.dev.parent = &pdev->dev; 1076 init_dummy_udc_hw(dum); 1077 1078 rc = usb_add_gadget_udc(&pdev->dev, &dum->gadget); 1079 if (rc < 0) 1080 goto err_udc; 1081 1082 rc = device_create_file(&dum->gadget.dev, &dev_attr_function); 1083 if (rc < 0) 1084 goto err_dev; 1085 platform_set_drvdata(pdev, dum); 1086 return rc; 1087 1088 err_dev: 1089 usb_del_gadget_udc(&dum->gadget); 1090 err_udc: 1091 return rc; 1092 } 1093 1094 static int dummy_udc_remove(struct platform_device *pdev) 1095 { 1096 struct dummy *dum = platform_get_drvdata(pdev); 1097 1098 device_remove_file(&dum->gadget.dev, &dev_attr_function); 1099 usb_del_gadget_udc(&dum->gadget); 1100 return 0; 1101 } 1102 1103 static void dummy_udc_pm(struct dummy *dum, struct dummy_hcd *dum_hcd, 1104 int suspend) 1105 { 1106 spin_lock_irq(&dum->lock); 1107 dum->udc_suspended = suspend; 1108 set_link_state(dum_hcd); 1109 spin_unlock_irq(&dum->lock); 1110 } 1111 1112 static int dummy_udc_suspend(struct platform_device *pdev, pm_message_t state) 1113 { 1114 struct dummy *dum = platform_get_drvdata(pdev); 1115 struct dummy_hcd *dum_hcd = gadget_to_dummy_hcd(&dum->gadget); 1116 1117 dev_dbg(&pdev->dev, "%s\n", __func__); 1118 dummy_udc_pm(dum, dum_hcd, 1); 1119 usb_hcd_poll_rh_status(dummy_hcd_to_hcd(dum_hcd)); 1120 return 0; 1121 } 1122 1123 static int dummy_udc_resume(struct platform_device *pdev) 1124 { 1125 struct dummy *dum = platform_get_drvdata(pdev); 1126 struct dummy_hcd *dum_hcd = gadget_to_dummy_hcd(&dum->gadget); 1127 1128 dev_dbg(&pdev->dev, "%s\n", __func__); 1129 dummy_udc_pm(dum, dum_hcd, 0); 1130 usb_hcd_poll_rh_status(dummy_hcd_to_hcd(dum_hcd)); 1131 return 0; 1132 } 1133 1134 static struct platform_driver dummy_udc_driver = { 1135 .probe = dummy_udc_probe, 1136 .remove = dummy_udc_remove, 1137 .suspend = dummy_udc_suspend, 1138 .resume = dummy_udc_resume, 1139 .driver = { 1140 .name = (char *) gadget_name, 1141 }, 1142 }; 1143 1144 /*-------------------------------------------------------------------------*/ 1145 1146 static unsigned int dummy_get_ep_idx(const struct usb_endpoint_descriptor *desc) 1147 { 1148 unsigned int index; 1149 1150 index = usb_endpoint_num(desc) << 1; 1151 if (usb_endpoint_dir_in(desc)) 1152 index |= 1; 1153 return index; 1154 } 1155 1156 /* MASTER/HOST SIDE DRIVER 1157 * 1158 * this uses the hcd framework to hook up to host side drivers. 1159 * its root hub will only have one device, otherwise it acts like 1160 * a normal host controller. 1161 * 1162 * when urbs are queued, they're just stuck on a list that we 1163 * scan in a timer callback. that callback connects writes from 1164 * the host with reads from the device, and so on, based on the 1165 * usb 2.0 rules. 1166 */ 1167 1168 static int dummy_ep_stream_en(struct dummy_hcd *dum_hcd, struct urb *urb) 1169 { 1170 const struct usb_endpoint_descriptor *desc = &urb->ep->desc; 1171 u32 index; 1172 1173 if (!usb_endpoint_xfer_bulk(desc)) 1174 return 0; 1175 1176 index = dummy_get_ep_idx(desc); 1177 return (1 << index) & dum_hcd->stream_en_ep; 1178 } 1179 1180 /* 1181 * The max stream number is saved as a nibble so for the 30 possible endpoints 1182 * we only 15 bytes of memory. Therefore we are limited to max 16 streams (0 1183 * means we use only 1 stream). The maximum according to the spec is 16bit so 1184 * if the 16 stream limit is about to go, the array size should be incremented 1185 * to 30 elements of type u16. 1186 */ 1187 static int get_max_streams_for_pipe(struct dummy_hcd *dum_hcd, 1188 unsigned int pipe) 1189 { 1190 int max_streams; 1191 1192 max_streams = dum_hcd->num_stream[usb_pipeendpoint(pipe)]; 1193 if (usb_pipeout(pipe)) 1194 max_streams >>= 4; 1195 else 1196 max_streams &= 0xf; 1197 max_streams++; 1198 return max_streams; 1199 } 1200 1201 static void set_max_streams_for_pipe(struct dummy_hcd *dum_hcd, 1202 unsigned int pipe, unsigned int streams) 1203 { 1204 int max_streams; 1205 1206 streams--; 1207 max_streams = dum_hcd->num_stream[usb_pipeendpoint(pipe)]; 1208 if (usb_pipeout(pipe)) { 1209 streams <<= 4; 1210 max_streams &= 0xf; 1211 } else { 1212 max_streams &= 0xf0; 1213 } 1214 max_streams |= streams; 1215 dum_hcd->num_stream[usb_pipeendpoint(pipe)] = max_streams; 1216 } 1217 1218 static int dummy_validate_stream(struct dummy_hcd *dum_hcd, struct urb *urb) 1219 { 1220 unsigned int max_streams; 1221 int enabled; 1222 1223 enabled = dummy_ep_stream_en(dum_hcd, urb); 1224 if (!urb->stream_id) { 1225 if (enabled) 1226 return -EINVAL; 1227 return 0; 1228 } 1229 if (!enabled) 1230 return -EINVAL; 1231 1232 max_streams = get_max_streams_for_pipe(dum_hcd, 1233 usb_pipeendpoint(urb->pipe)); 1234 if (urb->stream_id > max_streams) { 1235 dev_err(dummy_dev(dum_hcd), "Stream id %d is out of range.\n", 1236 urb->stream_id); 1237 BUG(); 1238 return -EINVAL; 1239 } 1240 return 0; 1241 } 1242 1243 static int dummy_urb_enqueue( 1244 struct usb_hcd *hcd, 1245 struct urb *urb, 1246 gfp_t mem_flags 1247 ) { 1248 struct dummy_hcd *dum_hcd; 1249 struct urbp *urbp; 1250 unsigned long flags; 1251 int rc; 1252 1253 urbp = kmalloc(sizeof *urbp, mem_flags); 1254 if (!urbp) 1255 return -ENOMEM; 1256 urbp->urb = urb; 1257 urbp->miter_started = 0; 1258 1259 dum_hcd = hcd_to_dummy_hcd(hcd); 1260 spin_lock_irqsave(&dum_hcd->dum->lock, flags); 1261 1262 rc = dummy_validate_stream(dum_hcd, urb); 1263 if (rc) { 1264 kfree(urbp); 1265 goto done; 1266 } 1267 1268 rc = usb_hcd_link_urb_to_ep(hcd, urb); 1269 if (rc) { 1270 kfree(urbp); 1271 goto done; 1272 } 1273 1274 if (!dum_hcd->udev) { 1275 dum_hcd->udev = urb->dev; 1276 usb_get_dev(dum_hcd->udev); 1277 } else if (unlikely(dum_hcd->udev != urb->dev)) 1278 dev_err(dummy_dev(dum_hcd), "usb_device address has changed!\n"); 1279 1280 list_add_tail(&urbp->urbp_list, &dum_hcd->urbp_list); 1281 urb->hcpriv = urbp; 1282 if (!dum_hcd->next_frame_urbp) 1283 dum_hcd->next_frame_urbp = urbp; 1284 if (usb_pipetype(urb->pipe) == PIPE_CONTROL) 1285 urb->error_count = 1; /* mark as a new urb */ 1286 1287 /* kick the scheduler, it'll do the rest */ 1288 if (!timer_pending(&dum_hcd->timer)) 1289 mod_timer(&dum_hcd->timer, jiffies + 1); 1290 1291 done: 1292 spin_unlock_irqrestore(&dum_hcd->dum->lock, flags); 1293 return rc; 1294 } 1295 1296 static int dummy_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status) 1297 { 1298 struct dummy_hcd *dum_hcd; 1299 unsigned long flags; 1300 int rc; 1301 1302 /* giveback happens automatically in timer callback, 1303 * so make sure the callback happens */ 1304 dum_hcd = hcd_to_dummy_hcd(hcd); 1305 spin_lock_irqsave(&dum_hcd->dum->lock, flags); 1306 1307 rc = usb_hcd_check_unlink_urb(hcd, urb, status); 1308 if (!rc && dum_hcd->rh_state != DUMMY_RH_RUNNING && 1309 !list_empty(&dum_hcd->urbp_list)) 1310 mod_timer(&dum_hcd->timer, jiffies); 1311 1312 spin_unlock_irqrestore(&dum_hcd->dum->lock, flags); 1313 return rc; 1314 } 1315 1316 static int dummy_perform_transfer(struct urb *urb, struct dummy_request *req, 1317 u32 len) 1318 { 1319 void *ubuf, *rbuf; 1320 struct urbp *urbp = urb->hcpriv; 1321 int to_host; 1322 struct sg_mapping_iter *miter = &urbp->miter; 1323 u32 trans = 0; 1324 u32 this_sg; 1325 bool next_sg; 1326 1327 to_host = usb_pipein(urb->pipe); 1328 rbuf = req->req.buf + req->req.actual; 1329 1330 if (!urb->num_sgs) { 1331 ubuf = urb->transfer_buffer + urb->actual_length; 1332 if (to_host) 1333 memcpy(ubuf, rbuf, len); 1334 else 1335 memcpy(rbuf, ubuf, len); 1336 return len; 1337 } 1338 1339 if (!urbp->miter_started) { 1340 u32 flags = SG_MITER_ATOMIC; 1341 1342 if (to_host) 1343 flags |= SG_MITER_TO_SG; 1344 else 1345 flags |= SG_MITER_FROM_SG; 1346 1347 sg_miter_start(miter, urb->sg, urb->num_sgs, flags); 1348 urbp->miter_started = 1; 1349 } 1350 next_sg = sg_miter_next(miter); 1351 if (next_sg == false) { 1352 WARN_ON_ONCE(1); 1353 return -EINVAL; 1354 } 1355 do { 1356 ubuf = miter->addr; 1357 this_sg = min_t(u32, len, miter->length); 1358 miter->consumed = this_sg; 1359 trans += this_sg; 1360 1361 if (to_host) 1362 memcpy(ubuf, rbuf, this_sg); 1363 else 1364 memcpy(rbuf, ubuf, this_sg); 1365 len -= this_sg; 1366 1367 if (!len) 1368 break; 1369 next_sg = sg_miter_next(miter); 1370 if (next_sg == false) { 1371 WARN_ON_ONCE(1); 1372 return -EINVAL; 1373 } 1374 1375 rbuf += this_sg; 1376 } while (1); 1377 1378 sg_miter_stop(miter); 1379 return trans; 1380 } 1381 1382 /* transfer up to a frame's worth; caller must own lock */ 1383 static int transfer(struct dummy_hcd *dum_hcd, struct urb *urb, 1384 struct dummy_ep *ep, int limit, int *status) 1385 { 1386 struct dummy *dum = dum_hcd->dum; 1387 struct dummy_request *req; 1388 int sent = 0; 1389 1390 top: 1391 /* if there's no request queued, the device is NAKing; return */ 1392 list_for_each_entry(req, &ep->queue, queue) { 1393 unsigned host_len, dev_len, len; 1394 int is_short, to_host; 1395 int rescan = 0; 1396 1397 if (dummy_ep_stream_en(dum_hcd, urb)) { 1398 if ((urb->stream_id != req->req.stream_id)) 1399 continue; 1400 } 1401 1402 /* 1..N packets of ep->ep.maxpacket each ... the last one 1403 * may be short (including zero length). 1404 * 1405 * writer can send a zlp explicitly (length 0) or implicitly 1406 * (length mod maxpacket zero, and 'zero' flag); they always 1407 * terminate reads. 1408 */ 1409 host_len = urb->transfer_buffer_length - urb->actual_length; 1410 dev_len = req->req.length - req->req.actual; 1411 len = min(host_len, dev_len); 1412 1413 /* FIXME update emulated data toggle too */ 1414 1415 to_host = usb_pipein(urb->pipe); 1416 if (unlikely(len == 0)) 1417 is_short = 1; 1418 else { 1419 /* not enough bandwidth left? */ 1420 if (limit < ep->ep.maxpacket && limit < len) 1421 break; 1422 len = min_t(unsigned, len, limit); 1423 if (len == 0) 1424 break; 1425 1426 /* send multiple of maxpacket first, then remainder */ 1427 if (len >= ep->ep.maxpacket) { 1428 is_short = 0; 1429 if (len % ep->ep.maxpacket) 1430 rescan = 1; 1431 len -= len % ep->ep.maxpacket; 1432 } else { 1433 is_short = 1; 1434 } 1435 1436 len = dummy_perform_transfer(urb, req, len); 1437 1438 ep->last_io = jiffies; 1439 if ((int)len < 0) { 1440 req->req.status = len; 1441 } else { 1442 limit -= len; 1443 sent += len; 1444 urb->actual_length += len; 1445 req->req.actual += len; 1446 } 1447 } 1448 1449 /* short packets terminate, maybe with overflow/underflow. 1450 * it's only really an error to write too much. 1451 * 1452 * partially filling a buffer optionally blocks queue advances 1453 * (so completion handlers can clean up the queue) but we don't 1454 * need to emulate such data-in-flight. 1455 */ 1456 if (is_short) { 1457 if (host_len == dev_len) { 1458 req->req.status = 0; 1459 *status = 0; 1460 } else if (to_host) { 1461 req->req.status = 0; 1462 if (dev_len > host_len) 1463 *status = -EOVERFLOW; 1464 else 1465 *status = 0; 1466 } else { 1467 *status = 0; 1468 if (host_len > dev_len) 1469 req->req.status = -EOVERFLOW; 1470 else 1471 req->req.status = 0; 1472 } 1473 1474 /* 1475 * many requests terminate without a short packet. 1476 * send a zlp if demanded by flags. 1477 */ 1478 } else { 1479 if (req->req.length == req->req.actual) { 1480 if (req->req.zero && to_host) 1481 rescan = 1; 1482 else 1483 req->req.status = 0; 1484 } 1485 if (urb->transfer_buffer_length == urb->actual_length) { 1486 if (urb->transfer_flags & URB_ZERO_PACKET && 1487 !to_host) 1488 rescan = 1; 1489 else 1490 *status = 0; 1491 } 1492 } 1493 1494 /* device side completion --> continuable */ 1495 if (req->req.status != -EINPROGRESS) { 1496 list_del_init(&req->queue); 1497 1498 spin_unlock(&dum->lock); 1499 usb_gadget_giveback_request(&ep->ep, &req->req); 1500 spin_lock(&dum->lock); 1501 1502 /* requests might have been unlinked... */ 1503 rescan = 1; 1504 } 1505 1506 /* host side completion --> terminate */ 1507 if (*status != -EINPROGRESS) 1508 break; 1509 1510 /* rescan to continue with any other queued i/o */ 1511 if (rescan) 1512 goto top; 1513 } 1514 return sent; 1515 } 1516 1517 static int periodic_bytes(struct dummy *dum, struct dummy_ep *ep) 1518 { 1519 int limit = ep->ep.maxpacket; 1520 1521 if (dum->gadget.speed == USB_SPEED_HIGH) { 1522 int tmp; 1523 1524 /* high bandwidth mode */ 1525 tmp = usb_endpoint_maxp_mult(ep->desc); 1526 tmp *= 8 /* applies to entire frame */; 1527 limit += limit * tmp; 1528 } 1529 if (dum->gadget.speed == USB_SPEED_SUPER) { 1530 switch (usb_endpoint_type(ep->desc)) { 1531 case USB_ENDPOINT_XFER_ISOC: 1532 /* Sec. 4.4.8.2 USB3.0 Spec */ 1533 limit = 3 * 16 * 1024 * 8; 1534 break; 1535 case USB_ENDPOINT_XFER_INT: 1536 /* Sec. 4.4.7.2 USB3.0 Spec */ 1537 limit = 3 * 1024 * 8; 1538 break; 1539 case USB_ENDPOINT_XFER_BULK: 1540 default: 1541 break; 1542 } 1543 } 1544 return limit; 1545 } 1546 1547 #define is_active(dum_hcd) ((dum_hcd->port_status & \ 1548 (USB_PORT_STAT_CONNECTION | USB_PORT_STAT_ENABLE | \ 1549 USB_PORT_STAT_SUSPEND)) \ 1550 == (USB_PORT_STAT_CONNECTION | USB_PORT_STAT_ENABLE)) 1551 1552 static struct dummy_ep *find_endpoint(struct dummy *dum, u8 address) 1553 { 1554 int i; 1555 1556 if (!is_active((dum->gadget.speed == USB_SPEED_SUPER ? 1557 dum->ss_hcd : dum->hs_hcd))) 1558 return NULL; 1559 if (!dum->ints_enabled) 1560 return NULL; 1561 if ((address & ~USB_DIR_IN) == 0) 1562 return &dum->ep[0]; 1563 for (i = 1; i < DUMMY_ENDPOINTS; i++) { 1564 struct dummy_ep *ep = &dum->ep[i]; 1565 1566 if (!ep->desc) 1567 continue; 1568 if (ep->desc->bEndpointAddress == address) 1569 return ep; 1570 } 1571 return NULL; 1572 } 1573 1574 #undef is_active 1575 1576 #define Dev_Request (USB_TYPE_STANDARD | USB_RECIP_DEVICE) 1577 #define Dev_InRequest (Dev_Request | USB_DIR_IN) 1578 #define Intf_Request (USB_TYPE_STANDARD | USB_RECIP_INTERFACE) 1579 #define Intf_InRequest (Intf_Request | USB_DIR_IN) 1580 #define Ep_Request (USB_TYPE_STANDARD | USB_RECIP_ENDPOINT) 1581 #define Ep_InRequest (Ep_Request | USB_DIR_IN) 1582 1583 1584 /** 1585 * handle_control_request() - handles all control transfers 1586 * @dum: pointer to dummy (the_controller) 1587 * @urb: the urb request to handle 1588 * @setup: pointer to the setup data for a USB device control 1589 * request 1590 * @status: pointer to request handling status 1591 * 1592 * Return 0 - if the request was handled 1593 * 1 - if the request wasn't handles 1594 * error code on error 1595 */ 1596 static int handle_control_request(struct dummy_hcd *dum_hcd, struct urb *urb, 1597 struct usb_ctrlrequest *setup, 1598 int *status) 1599 { 1600 struct dummy_ep *ep2; 1601 struct dummy *dum = dum_hcd->dum; 1602 int ret_val = 1; 1603 unsigned w_index; 1604 unsigned w_value; 1605 1606 w_index = le16_to_cpu(setup->wIndex); 1607 w_value = le16_to_cpu(setup->wValue); 1608 switch (setup->bRequest) { 1609 case USB_REQ_SET_ADDRESS: 1610 if (setup->bRequestType != Dev_Request) 1611 break; 1612 dum->address = w_value; 1613 *status = 0; 1614 dev_dbg(udc_dev(dum), "set_address = %d\n", 1615 w_value); 1616 ret_val = 0; 1617 break; 1618 case USB_REQ_SET_FEATURE: 1619 if (setup->bRequestType == Dev_Request) { 1620 ret_val = 0; 1621 switch (w_value) { 1622 case USB_DEVICE_REMOTE_WAKEUP: 1623 break; 1624 case USB_DEVICE_B_HNP_ENABLE: 1625 dum->gadget.b_hnp_enable = 1; 1626 break; 1627 case USB_DEVICE_A_HNP_SUPPORT: 1628 dum->gadget.a_hnp_support = 1; 1629 break; 1630 case USB_DEVICE_A_ALT_HNP_SUPPORT: 1631 dum->gadget.a_alt_hnp_support = 1; 1632 break; 1633 case USB_DEVICE_U1_ENABLE: 1634 if (dummy_hcd_to_hcd(dum_hcd)->speed == 1635 HCD_USB3) 1636 w_value = USB_DEV_STAT_U1_ENABLED; 1637 else 1638 ret_val = -EOPNOTSUPP; 1639 break; 1640 case USB_DEVICE_U2_ENABLE: 1641 if (dummy_hcd_to_hcd(dum_hcd)->speed == 1642 HCD_USB3) 1643 w_value = USB_DEV_STAT_U2_ENABLED; 1644 else 1645 ret_val = -EOPNOTSUPP; 1646 break; 1647 case USB_DEVICE_LTM_ENABLE: 1648 if (dummy_hcd_to_hcd(dum_hcd)->speed == 1649 HCD_USB3) 1650 w_value = USB_DEV_STAT_LTM_ENABLED; 1651 else 1652 ret_val = -EOPNOTSUPP; 1653 break; 1654 default: 1655 ret_val = -EOPNOTSUPP; 1656 } 1657 if (ret_val == 0) { 1658 dum->devstatus |= (1 << w_value); 1659 *status = 0; 1660 } 1661 } else if (setup->bRequestType == Ep_Request) { 1662 /* endpoint halt */ 1663 ep2 = find_endpoint(dum, w_index); 1664 if (!ep2 || ep2->ep.name == ep0name) { 1665 ret_val = -EOPNOTSUPP; 1666 break; 1667 } 1668 ep2->halted = 1; 1669 ret_val = 0; 1670 *status = 0; 1671 } 1672 break; 1673 case USB_REQ_CLEAR_FEATURE: 1674 if (setup->bRequestType == Dev_Request) { 1675 ret_val = 0; 1676 switch (w_value) { 1677 case USB_DEVICE_REMOTE_WAKEUP: 1678 w_value = USB_DEVICE_REMOTE_WAKEUP; 1679 break; 1680 case USB_DEVICE_U1_ENABLE: 1681 if (dummy_hcd_to_hcd(dum_hcd)->speed == 1682 HCD_USB3) 1683 w_value = USB_DEV_STAT_U1_ENABLED; 1684 else 1685 ret_val = -EOPNOTSUPP; 1686 break; 1687 case USB_DEVICE_U2_ENABLE: 1688 if (dummy_hcd_to_hcd(dum_hcd)->speed == 1689 HCD_USB3) 1690 w_value = USB_DEV_STAT_U2_ENABLED; 1691 else 1692 ret_val = -EOPNOTSUPP; 1693 break; 1694 case USB_DEVICE_LTM_ENABLE: 1695 if (dummy_hcd_to_hcd(dum_hcd)->speed == 1696 HCD_USB3) 1697 w_value = USB_DEV_STAT_LTM_ENABLED; 1698 else 1699 ret_val = -EOPNOTSUPP; 1700 break; 1701 default: 1702 ret_val = -EOPNOTSUPP; 1703 break; 1704 } 1705 if (ret_val == 0) { 1706 dum->devstatus &= ~(1 << w_value); 1707 *status = 0; 1708 } 1709 } else if (setup->bRequestType == Ep_Request) { 1710 /* endpoint halt */ 1711 ep2 = find_endpoint(dum, w_index); 1712 if (!ep2) { 1713 ret_val = -EOPNOTSUPP; 1714 break; 1715 } 1716 if (!ep2->wedged) 1717 ep2->halted = 0; 1718 ret_val = 0; 1719 *status = 0; 1720 } 1721 break; 1722 case USB_REQ_GET_STATUS: 1723 if (setup->bRequestType == Dev_InRequest 1724 || setup->bRequestType == Intf_InRequest 1725 || setup->bRequestType == Ep_InRequest) { 1726 char *buf; 1727 /* 1728 * device: remote wakeup, selfpowered 1729 * interface: nothing 1730 * endpoint: halt 1731 */ 1732 buf = (char *)urb->transfer_buffer; 1733 if (urb->transfer_buffer_length > 0) { 1734 if (setup->bRequestType == Ep_InRequest) { 1735 ep2 = find_endpoint(dum, w_index); 1736 if (!ep2) { 1737 ret_val = -EOPNOTSUPP; 1738 break; 1739 } 1740 buf[0] = ep2->halted; 1741 } else if (setup->bRequestType == 1742 Dev_InRequest) { 1743 buf[0] = (u8)dum->devstatus; 1744 } else 1745 buf[0] = 0; 1746 } 1747 if (urb->transfer_buffer_length > 1) 1748 buf[1] = 0; 1749 urb->actual_length = min_t(u32, 2, 1750 urb->transfer_buffer_length); 1751 ret_val = 0; 1752 *status = 0; 1753 } 1754 break; 1755 } 1756 return ret_val; 1757 } 1758 1759 /* drive both sides of the transfers; looks like irq handlers to 1760 * both drivers except the callbacks aren't in_irq(). 1761 */ 1762 static void dummy_timer(struct timer_list *t) 1763 { 1764 struct dummy_hcd *dum_hcd = from_timer(dum_hcd, t, timer); 1765 struct dummy *dum = dum_hcd->dum; 1766 struct urbp *urbp, *tmp; 1767 unsigned long flags; 1768 int limit, total; 1769 int i; 1770 1771 /* simplistic model for one frame's bandwidth */ 1772 /* FIXME: account for transaction and packet overhead */ 1773 switch (dum->gadget.speed) { 1774 case USB_SPEED_LOW: 1775 total = 8/*bytes*/ * 12/*packets*/; 1776 break; 1777 case USB_SPEED_FULL: 1778 total = 64/*bytes*/ * 19/*packets*/; 1779 break; 1780 case USB_SPEED_HIGH: 1781 total = 512/*bytes*/ * 13/*packets*/ * 8/*uframes*/; 1782 break; 1783 case USB_SPEED_SUPER: 1784 /* Bus speed is 500000 bytes/ms, so use a little less */ 1785 total = 490000; 1786 break; 1787 default: 1788 dev_err(dummy_dev(dum_hcd), "bogus device speed\n"); 1789 return; 1790 } 1791 1792 /* FIXME if HZ != 1000 this will probably misbehave ... */ 1793 1794 /* look at each urb queued by the host side driver */ 1795 spin_lock_irqsave(&dum->lock, flags); 1796 1797 if (!dum_hcd->udev) { 1798 dev_err(dummy_dev(dum_hcd), 1799 "timer fired with no URBs pending?\n"); 1800 spin_unlock_irqrestore(&dum->lock, flags); 1801 return; 1802 } 1803 dum_hcd->next_frame_urbp = NULL; 1804 1805 for (i = 0; i < DUMMY_ENDPOINTS; i++) { 1806 if (!ep_info[i].name) 1807 break; 1808 dum->ep[i].already_seen = 0; 1809 } 1810 1811 restart: 1812 list_for_each_entry_safe(urbp, tmp, &dum_hcd->urbp_list, urbp_list) { 1813 struct urb *urb; 1814 struct dummy_request *req; 1815 u8 address; 1816 struct dummy_ep *ep = NULL; 1817 int status = -EINPROGRESS; 1818 1819 /* stop when we reach URBs queued after the timer interrupt */ 1820 if (urbp == dum_hcd->next_frame_urbp) 1821 break; 1822 1823 urb = urbp->urb; 1824 if (urb->unlinked) 1825 goto return_urb; 1826 else if (dum_hcd->rh_state != DUMMY_RH_RUNNING) 1827 continue; 1828 1829 /* Used up this frame's bandwidth? */ 1830 if (total <= 0) 1831 break; 1832 1833 /* find the gadget's ep for this request (if configured) */ 1834 address = usb_pipeendpoint (urb->pipe); 1835 if (usb_pipein(urb->pipe)) 1836 address |= USB_DIR_IN; 1837 ep = find_endpoint(dum, address); 1838 if (!ep) { 1839 /* set_configuration() disagreement */ 1840 dev_dbg(dummy_dev(dum_hcd), 1841 "no ep configured for urb %p\n", 1842 urb); 1843 status = -EPROTO; 1844 goto return_urb; 1845 } 1846 1847 if (ep->already_seen) 1848 continue; 1849 ep->already_seen = 1; 1850 if (ep == &dum->ep[0] && urb->error_count) { 1851 ep->setup_stage = 1; /* a new urb */ 1852 urb->error_count = 0; 1853 } 1854 if (ep->halted && !ep->setup_stage) { 1855 /* NOTE: must not be iso! */ 1856 dev_dbg(dummy_dev(dum_hcd), "ep %s halted, urb %p\n", 1857 ep->ep.name, urb); 1858 status = -EPIPE; 1859 goto return_urb; 1860 } 1861 /* FIXME make sure both ends agree on maxpacket */ 1862 1863 /* handle control requests */ 1864 if (ep == &dum->ep[0] && ep->setup_stage) { 1865 struct usb_ctrlrequest setup; 1866 int value = 1; 1867 1868 setup = *(struct usb_ctrlrequest *) urb->setup_packet; 1869 /* paranoia, in case of stale queued data */ 1870 list_for_each_entry(req, &ep->queue, queue) { 1871 list_del_init(&req->queue); 1872 req->req.status = -EOVERFLOW; 1873 dev_dbg(udc_dev(dum), "stale req = %p\n", 1874 req); 1875 1876 spin_unlock(&dum->lock); 1877 usb_gadget_giveback_request(&ep->ep, &req->req); 1878 spin_lock(&dum->lock); 1879 ep->already_seen = 0; 1880 goto restart; 1881 } 1882 1883 /* gadget driver never sees set_address or operations 1884 * on standard feature flags. some hardware doesn't 1885 * even expose them. 1886 */ 1887 ep->last_io = jiffies; 1888 ep->setup_stage = 0; 1889 ep->halted = 0; 1890 1891 value = handle_control_request(dum_hcd, urb, &setup, 1892 &status); 1893 1894 /* gadget driver handles all other requests. block 1895 * until setup() returns; no reentrancy issues etc. 1896 */ 1897 if (value > 0) { 1898 ++dum->callback_usage; 1899 spin_unlock(&dum->lock); 1900 value = dum->driver->setup(&dum->gadget, 1901 &setup); 1902 spin_lock(&dum->lock); 1903 --dum->callback_usage; 1904 1905 if (value >= 0) { 1906 /* no delays (max 64KB data stage) */ 1907 limit = 64*1024; 1908 goto treat_control_like_bulk; 1909 } 1910 /* error, see below */ 1911 } 1912 1913 if (value < 0) { 1914 if (value != -EOPNOTSUPP) 1915 dev_dbg(udc_dev(dum), 1916 "setup --> %d\n", 1917 value); 1918 status = -EPIPE; 1919 urb->actual_length = 0; 1920 } 1921 1922 goto return_urb; 1923 } 1924 1925 /* non-control requests */ 1926 limit = total; 1927 switch (usb_pipetype(urb->pipe)) { 1928 case PIPE_ISOCHRONOUS: 1929 /* 1930 * We don't support isochronous. But if we did, 1931 * here are some of the issues we'd have to face: 1932 * 1933 * Is it urb->interval since the last xfer? 1934 * Use urb->iso_frame_desc[i]. 1935 * Complete whether or not ep has requests queued. 1936 * Report random errors, to debug drivers. 1937 */ 1938 limit = max(limit, periodic_bytes(dum, ep)); 1939 status = -EINVAL; /* fail all xfers */ 1940 break; 1941 1942 case PIPE_INTERRUPT: 1943 /* FIXME is it urb->interval since the last xfer? 1944 * this almost certainly polls too fast. 1945 */ 1946 limit = max(limit, periodic_bytes(dum, ep)); 1947 /* FALLTHROUGH */ 1948 1949 default: 1950 treat_control_like_bulk: 1951 ep->last_io = jiffies; 1952 total -= transfer(dum_hcd, urb, ep, limit, &status); 1953 break; 1954 } 1955 1956 /* incomplete transfer? */ 1957 if (status == -EINPROGRESS) 1958 continue; 1959 1960 return_urb: 1961 list_del(&urbp->urbp_list); 1962 kfree(urbp); 1963 if (ep) 1964 ep->already_seen = ep->setup_stage = 0; 1965 1966 usb_hcd_unlink_urb_from_ep(dummy_hcd_to_hcd(dum_hcd), urb); 1967 spin_unlock(&dum->lock); 1968 usb_hcd_giveback_urb(dummy_hcd_to_hcd(dum_hcd), urb, status); 1969 spin_lock(&dum->lock); 1970 1971 goto restart; 1972 } 1973 1974 if (list_empty(&dum_hcd->urbp_list)) { 1975 usb_put_dev(dum_hcd->udev); 1976 dum_hcd->udev = NULL; 1977 } else if (dum_hcd->rh_state == DUMMY_RH_RUNNING) { 1978 /* want a 1 msec delay here */ 1979 mod_timer(&dum_hcd->timer, jiffies + msecs_to_jiffies(1)); 1980 } 1981 1982 spin_unlock_irqrestore(&dum->lock, flags); 1983 } 1984 1985 /*-------------------------------------------------------------------------*/ 1986 1987 #define PORT_C_MASK \ 1988 ((USB_PORT_STAT_C_CONNECTION \ 1989 | USB_PORT_STAT_C_ENABLE \ 1990 | USB_PORT_STAT_C_SUSPEND \ 1991 | USB_PORT_STAT_C_OVERCURRENT \ 1992 | USB_PORT_STAT_C_RESET) << 16) 1993 1994 static int dummy_hub_status(struct usb_hcd *hcd, char *buf) 1995 { 1996 struct dummy_hcd *dum_hcd; 1997 unsigned long flags; 1998 int retval = 0; 1999 2000 dum_hcd = hcd_to_dummy_hcd(hcd); 2001 2002 spin_lock_irqsave(&dum_hcd->dum->lock, flags); 2003 if (!HCD_HW_ACCESSIBLE(hcd)) 2004 goto done; 2005 2006 if (dum_hcd->resuming && time_after_eq(jiffies, dum_hcd->re_timeout)) { 2007 dum_hcd->port_status |= (USB_PORT_STAT_C_SUSPEND << 16); 2008 dum_hcd->port_status &= ~USB_PORT_STAT_SUSPEND; 2009 set_link_state(dum_hcd); 2010 } 2011 2012 if ((dum_hcd->port_status & PORT_C_MASK) != 0) { 2013 *buf = (1 << 1); 2014 dev_dbg(dummy_dev(dum_hcd), "port status 0x%08x has changes\n", 2015 dum_hcd->port_status); 2016 retval = 1; 2017 if (dum_hcd->rh_state == DUMMY_RH_SUSPENDED) 2018 usb_hcd_resume_root_hub(hcd); 2019 } 2020 done: 2021 spin_unlock_irqrestore(&dum_hcd->dum->lock, flags); 2022 return retval; 2023 } 2024 2025 /* usb 3.0 root hub device descriptor */ 2026 static struct { 2027 struct usb_bos_descriptor bos; 2028 struct usb_ss_cap_descriptor ss_cap; 2029 } __packed usb3_bos_desc = { 2030 2031 .bos = { 2032 .bLength = USB_DT_BOS_SIZE, 2033 .bDescriptorType = USB_DT_BOS, 2034 .wTotalLength = cpu_to_le16(sizeof(usb3_bos_desc)), 2035 .bNumDeviceCaps = 1, 2036 }, 2037 .ss_cap = { 2038 .bLength = USB_DT_USB_SS_CAP_SIZE, 2039 .bDescriptorType = USB_DT_DEVICE_CAPABILITY, 2040 .bDevCapabilityType = USB_SS_CAP_TYPE, 2041 .wSpeedSupported = cpu_to_le16(USB_5GBPS_OPERATION), 2042 .bFunctionalitySupport = ilog2(USB_5GBPS_OPERATION), 2043 }, 2044 }; 2045 2046 static inline void 2047 ss_hub_descriptor(struct usb_hub_descriptor *desc) 2048 { 2049 memset(desc, 0, sizeof *desc); 2050 desc->bDescriptorType = USB_DT_SS_HUB; 2051 desc->bDescLength = 12; 2052 desc->wHubCharacteristics = cpu_to_le16( 2053 HUB_CHAR_INDV_PORT_LPSM | 2054 HUB_CHAR_COMMON_OCPM); 2055 desc->bNbrPorts = 1; 2056 desc->u.ss.bHubHdrDecLat = 0x04; /* Worst case: 0.4 micro sec*/ 2057 desc->u.ss.DeviceRemovable = 0; 2058 } 2059 2060 static inline void hub_descriptor(struct usb_hub_descriptor *desc) 2061 { 2062 memset(desc, 0, sizeof *desc); 2063 desc->bDescriptorType = USB_DT_HUB; 2064 desc->bDescLength = 9; 2065 desc->wHubCharacteristics = cpu_to_le16( 2066 HUB_CHAR_INDV_PORT_LPSM | 2067 HUB_CHAR_COMMON_OCPM); 2068 desc->bNbrPorts = 1; 2069 desc->u.hs.DeviceRemovable[0] = 0; 2070 desc->u.hs.DeviceRemovable[1] = 0xff; /* PortPwrCtrlMask */ 2071 } 2072 2073 static int dummy_hub_control( 2074 struct usb_hcd *hcd, 2075 u16 typeReq, 2076 u16 wValue, 2077 u16 wIndex, 2078 char *buf, 2079 u16 wLength 2080 ) { 2081 struct dummy_hcd *dum_hcd; 2082 int retval = 0; 2083 unsigned long flags; 2084 2085 if (!HCD_HW_ACCESSIBLE(hcd)) 2086 return -ETIMEDOUT; 2087 2088 dum_hcd = hcd_to_dummy_hcd(hcd); 2089 2090 spin_lock_irqsave(&dum_hcd->dum->lock, flags); 2091 switch (typeReq) { 2092 case ClearHubFeature: 2093 break; 2094 case ClearPortFeature: 2095 switch (wValue) { 2096 case USB_PORT_FEAT_SUSPEND: 2097 if (hcd->speed == HCD_USB3) { 2098 dev_dbg(dummy_dev(dum_hcd), 2099 "USB_PORT_FEAT_SUSPEND req not " 2100 "supported for USB 3.0 roothub\n"); 2101 goto error; 2102 } 2103 if (dum_hcd->port_status & USB_PORT_STAT_SUSPEND) { 2104 /* 20msec resume signaling */ 2105 dum_hcd->resuming = 1; 2106 dum_hcd->re_timeout = jiffies + 2107 msecs_to_jiffies(20); 2108 } 2109 break; 2110 case USB_PORT_FEAT_POWER: 2111 dev_dbg(dummy_dev(dum_hcd), "power-off\n"); 2112 if (hcd->speed == HCD_USB3) 2113 dum_hcd->port_status &= ~USB_SS_PORT_STAT_POWER; 2114 else 2115 dum_hcd->port_status &= ~USB_PORT_STAT_POWER; 2116 set_link_state(dum_hcd); 2117 break; 2118 default: 2119 dum_hcd->port_status &= ~(1 << wValue); 2120 set_link_state(dum_hcd); 2121 } 2122 break; 2123 case GetHubDescriptor: 2124 if (hcd->speed == HCD_USB3 && 2125 (wLength < USB_DT_SS_HUB_SIZE || 2126 wValue != (USB_DT_SS_HUB << 8))) { 2127 dev_dbg(dummy_dev(dum_hcd), 2128 "Wrong hub descriptor type for " 2129 "USB 3.0 roothub.\n"); 2130 goto error; 2131 } 2132 if (hcd->speed == HCD_USB3) 2133 ss_hub_descriptor((struct usb_hub_descriptor *) buf); 2134 else 2135 hub_descriptor((struct usb_hub_descriptor *) buf); 2136 break; 2137 2138 case DeviceRequest | USB_REQ_GET_DESCRIPTOR: 2139 if (hcd->speed != HCD_USB3) 2140 goto error; 2141 2142 if ((wValue >> 8) != USB_DT_BOS) 2143 goto error; 2144 2145 memcpy(buf, &usb3_bos_desc, sizeof(usb3_bos_desc)); 2146 retval = sizeof(usb3_bos_desc); 2147 break; 2148 2149 case GetHubStatus: 2150 *(__le32 *) buf = cpu_to_le32(0); 2151 break; 2152 case GetPortStatus: 2153 if (wIndex != 1) 2154 retval = -EPIPE; 2155 2156 /* whoever resets or resumes must GetPortStatus to 2157 * complete it!! 2158 */ 2159 if (dum_hcd->resuming && 2160 time_after_eq(jiffies, dum_hcd->re_timeout)) { 2161 dum_hcd->port_status |= (USB_PORT_STAT_C_SUSPEND << 16); 2162 dum_hcd->port_status &= ~USB_PORT_STAT_SUSPEND; 2163 } 2164 if ((dum_hcd->port_status & USB_PORT_STAT_RESET) != 0 && 2165 time_after_eq(jiffies, dum_hcd->re_timeout)) { 2166 dum_hcd->port_status |= (USB_PORT_STAT_C_RESET << 16); 2167 dum_hcd->port_status &= ~USB_PORT_STAT_RESET; 2168 if (dum_hcd->dum->pullup) { 2169 dum_hcd->port_status |= USB_PORT_STAT_ENABLE; 2170 2171 if (hcd->speed < HCD_USB3) { 2172 switch (dum_hcd->dum->gadget.speed) { 2173 case USB_SPEED_HIGH: 2174 dum_hcd->port_status |= 2175 USB_PORT_STAT_HIGH_SPEED; 2176 break; 2177 case USB_SPEED_LOW: 2178 dum_hcd->dum->gadget.ep0-> 2179 maxpacket = 8; 2180 dum_hcd->port_status |= 2181 USB_PORT_STAT_LOW_SPEED; 2182 break; 2183 default: 2184 break; 2185 } 2186 } 2187 } 2188 } 2189 set_link_state(dum_hcd); 2190 ((__le16 *) buf)[0] = cpu_to_le16(dum_hcd->port_status); 2191 ((__le16 *) buf)[1] = cpu_to_le16(dum_hcd->port_status >> 16); 2192 break; 2193 case SetHubFeature: 2194 retval = -EPIPE; 2195 break; 2196 case SetPortFeature: 2197 switch (wValue) { 2198 case USB_PORT_FEAT_LINK_STATE: 2199 if (hcd->speed != HCD_USB3) { 2200 dev_dbg(dummy_dev(dum_hcd), 2201 "USB_PORT_FEAT_LINK_STATE req not " 2202 "supported for USB 2.0 roothub\n"); 2203 goto error; 2204 } 2205 /* 2206 * Since this is dummy we don't have an actual link so 2207 * there is nothing to do for the SET_LINK_STATE cmd 2208 */ 2209 break; 2210 case USB_PORT_FEAT_U1_TIMEOUT: 2211 case USB_PORT_FEAT_U2_TIMEOUT: 2212 /* TODO: add suspend/resume support! */ 2213 if (hcd->speed != HCD_USB3) { 2214 dev_dbg(dummy_dev(dum_hcd), 2215 "USB_PORT_FEAT_U1/2_TIMEOUT req not " 2216 "supported for USB 2.0 roothub\n"); 2217 goto error; 2218 } 2219 break; 2220 case USB_PORT_FEAT_SUSPEND: 2221 /* Applicable only for USB2.0 hub */ 2222 if (hcd->speed == HCD_USB3) { 2223 dev_dbg(dummy_dev(dum_hcd), 2224 "USB_PORT_FEAT_SUSPEND req not " 2225 "supported for USB 3.0 roothub\n"); 2226 goto error; 2227 } 2228 if (dum_hcd->active) { 2229 dum_hcd->port_status |= USB_PORT_STAT_SUSPEND; 2230 2231 /* HNP would happen here; for now we 2232 * assume b_bus_req is always true. 2233 */ 2234 set_link_state(dum_hcd); 2235 if (((1 << USB_DEVICE_B_HNP_ENABLE) 2236 & dum_hcd->dum->devstatus) != 0) 2237 dev_dbg(dummy_dev(dum_hcd), 2238 "no HNP yet!\n"); 2239 } 2240 break; 2241 case USB_PORT_FEAT_POWER: 2242 if (hcd->speed == HCD_USB3) 2243 dum_hcd->port_status |= USB_SS_PORT_STAT_POWER; 2244 else 2245 dum_hcd->port_status |= USB_PORT_STAT_POWER; 2246 set_link_state(dum_hcd); 2247 break; 2248 case USB_PORT_FEAT_BH_PORT_RESET: 2249 /* Applicable only for USB3.0 hub */ 2250 if (hcd->speed != HCD_USB3) { 2251 dev_dbg(dummy_dev(dum_hcd), 2252 "USB_PORT_FEAT_BH_PORT_RESET req not " 2253 "supported for USB 2.0 roothub\n"); 2254 goto error; 2255 } 2256 /* FALLS THROUGH */ 2257 case USB_PORT_FEAT_RESET: 2258 /* if it's already enabled, disable */ 2259 if (hcd->speed == HCD_USB3) { 2260 dum_hcd->port_status = 0; 2261 dum_hcd->port_status = 2262 (USB_SS_PORT_STAT_POWER | 2263 USB_PORT_STAT_CONNECTION | 2264 USB_PORT_STAT_RESET); 2265 } else 2266 dum_hcd->port_status &= ~(USB_PORT_STAT_ENABLE 2267 | USB_PORT_STAT_LOW_SPEED 2268 | USB_PORT_STAT_HIGH_SPEED); 2269 /* 2270 * We want to reset device status. All but the 2271 * Self powered feature 2272 */ 2273 dum_hcd->dum->devstatus &= 2274 (1 << USB_DEVICE_SELF_POWERED); 2275 /* 2276 * FIXME USB3.0: what is the correct reset signaling 2277 * interval? Is it still 50msec as for HS? 2278 */ 2279 dum_hcd->re_timeout = jiffies + msecs_to_jiffies(50); 2280 /* FALLS THROUGH */ 2281 default: 2282 if (hcd->speed == HCD_USB3) { 2283 if ((dum_hcd->port_status & 2284 USB_SS_PORT_STAT_POWER) != 0) { 2285 dum_hcd->port_status |= (1 << wValue); 2286 } 2287 } else 2288 if ((dum_hcd->port_status & 2289 USB_PORT_STAT_POWER) != 0) { 2290 dum_hcd->port_status |= (1 << wValue); 2291 } 2292 set_link_state(dum_hcd); 2293 } 2294 break; 2295 case GetPortErrorCount: 2296 if (hcd->speed != HCD_USB3) { 2297 dev_dbg(dummy_dev(dum_hcd), 2298 "GetPortErrorCount req not " 2299 "supported for USB 2.0 roothub\n"); 2300 goto error; 2301 } 2302 /* We'll always return 0 since this is a dummy hub */ 2303 *(__le32 *) buf = cpu_to_le32(0); 2304 break; 2305 case SetHubDepth: 2306 if (hcd->speed != HCD_USB3) { 2307 dev_dbg(dummy_dev(dum_hcd), 2308 "SetHubDepth req not supported for " 2309 "USB 2.0 roothub\n"); 2310 goto error; 2311 } 2312 break; 2313 default: 2314 dev_dbg(dummy_dev(dum_hcd), 2315 "hub control req%04x v%04x i%04x l%d\n", 2316 typeReq, wValue, wIndex, wLength); 2317 error: 2318 /* "protocol stall" on error */ 2319 retval = -EPIPE; 2320 } 2321 spin_unlock_irqrestore(&dum_hcd->dum->lock, flags); 2322 2323 if ((dum_hcd->port_status & PORT_C_MASK) != 0) 2324 usb_hcd_poll_rh_status(hcd); 2325 return retval; 2326 } 2327 2328 static int dummy_bus_suspend(struct usb_hcd *hcd) 2329 { 2330 struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd); 2331 2332 dev_dbg(&hcd->self.root_hub->dev, "%s\n", __func__); 2333 2334 spin_lock_irq(&dum_hcd->dum->lock); 2335 dum_hcd->rh_state = DUMMY_RH_SUSPENDED; 2336 set_link_state(dum_hcd); 2337 hcd->state = HC_STATE_SUSPENDED; 2338 spin_unlock_irq(&dum_hcd->dum->lock); 2339 return 0; 2340 } 2341 2342 static int dummy_bus_resume(struct usb_hcd *hcd) 2343 { 2344 struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd); 2345 int rc = 0; 2346 2347 dev_dbg(&hcd->self.root_hub->dev, "%s\n", __func__); 2348 2349 spin_lock_irq(&dum_hcd->dum->lock); 2350 if (!HCD_HW_ACCESSIBLE(hcd)) { 2351 rc = -ESHUTDOWN; 2352 } else { 2353 dum_hcd->rh_state = DUMMY_RH_RUNNING; 2354 set_link_state(dum_hcd); 2355 if (!list_empty(&dum_hcd->urbp_list)) 2356 mod_timer(&dum_hcd->timer, jiffies); 2357 hcd->state = HC_STATE_RUNNING; 2358 } 2359 spin_unlock_irq(&dum_hcd->dum->lock); 2360 return rc; 2361 } 2362 2363 /*-------------------------------------------------------------------------*/ 2364 2365 static inline ssize_t show_urb(char *buf, size_t size, struct urb *urb) 2366 { 2367 int ep = usb_pipeendpoint(urb->pipe); 2368 2369 return snprintf(buf, size, 2370 "urb/%p %s ep%d%s%s len %d/%d\n", 2371 urb, 2372 ({ char *s; 2373 switch (urb->dev->speed) { 2374 case USB_SPEED_LOW: 2375 s = "ls"; 2376 break; 2377 case USB_SPEED_FULL: 2378 s = "fs"; 2379 break; 2380 case USB_SPEED_HIGH: 2381 s = "hs"; 2382 break; 2383 case USB_SPEED_SUPER: 2384 s = "ss"; 2385 break; 2386 default: 2387 s = "?"; 2388 break; 2389 } s; }), 2390 ep, ep ? (usb_pipein(urb->pipe) ? "in" : "out") : "", 2391 ({ char *s; \ 2392 switch (usb_pipetype(urb->pipe)) { \ 2393 case PIPE_CONTROL: \ 2394 s = ""; \ 2395 break; \ 2396 case PIPE_BULK: \ 2397 s = "-bulk"; \ 2398 break; \ 2399 case PIPE_INTERRUPT: \ 2400 s = "-int"; \ 2401 break; \ 2402 default: \ 2403 s = "-iso"; \ 2404 break; \ 2405 } s; }), 2406 urb->actual_length, urb->transfer_buffer_length); 2407 } 2408 2409 static ssize_t urbs_show(struct device *dev, struct device_attribute *attr, 2410 char *buf) 2411 { 2412 struct usb_hcd *hcd = dev_get_drvdata(dev); 2413 struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd); 2414 struct urbp *urbp; 2415 size_t size = 0; 2416 unsigned long flags; 2417 2418 spin_lock_irqsave(&dum_hcd->dum->lock, flags); 2419 list_for_each_entry(urbp, &dum_hcd->urbp_list, urbp_list) { 2420 size_t temp; 2421 2422 temp = show_urb(buf, PAGE_SIZE - size, urbp->urb); 2423 buf += temp; 2424 size += temp; 2425 } 2426 spin_unlock_irqrestore(&dum_hcd->dum->lock, flags); 2427 2428 return size; 2429 } 2430 static DEVICE_ATTR_RO(urbs); 2431 2432 static int dummy_start_ss(struct dummy_hcd *dum_hcd) 2433 { 2434 timer_setup(&dum_hcd->timer, dummy_timer, 0); 2435 dum_hcd->rh_state = DUMMY_RH_RUNNING; 2436 dum_hcd->stream_en_ep = 0; 2437 INIT_LIST_HEAD(&dum_hcd->urbp_list); 2438 dummy_hcd_to_hcd(dum_hcd)->power_budget = POWER_BUDGET; 2439 dummy_hcd_to_hcd(dum_hcd)->state = HC_STATE_RUNNING; 2440 dummy_hcd_to_hcd(dum_hcd)->uses_new_polling = 1; 2441 #ifdef CONFIG_USB_OTG 2442 dummy_hcd_to_hcd(dum_hcd)->self.otg_port = 1; 2443 #endif 2444 return 0; 2445 2446 /* FIXME 'urbs' should be a per-device thing, maybe in usbcore */ 2447 return device_create_file(dummy_dev(dum_hcd), &dev_attr_urbs); 2448 } 2449 2450 static int dummy_start(struct usb_hcd *hcd) 2451 { 2452 struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd); 2453 2454 /* 2455 * MASTER side init ... we emulate a root hub that'll only ever 2456 * talk to one device (the slave side). Also appears in sysfs, 2457 * just like more familiar pci-based HCDs. 2458 */ 2459 if (!usb_hcd_is_primary_hcd(hcd)) 2460 return dummy_start_ss(dum_hcd); 2461 2462 spin_lock_init(&dum_hcd->dum->lock); 2463 timer_setup(&dum_hcd->timer, dummy_timer, 0); 2464 dum_hcd->rh_state = DUMMY_RH_RUNNING; 2465 2466 INIT_LIST_HEAD(&dum_hcd->urbp_list); 2467 2468 hcd->power_budget = POWER_BUDGET; 2469 hcd->state = HC_STATE_RUNNING; 2470 hcd->uses_new_polling = 1; 2471 2472 #ifdef CONFIG_USB_OTG 2473 hcd->self.otg_port = 1; 2474 #endif 2475 2476 /* FIXME 'urbs' should be a per-device thing, maybe in usbcore */ 2477 return device_create_file(dummy_dev(dum_hcd), &dev_attr_urbs); 2478 } 2479 2480 static void dummy_stop(struct usb_hcd *hcd) 2481 { 2482 device_remove_file(dummy_dev(hcd_to_dummy_hcd(hcd)), &dev_attr_urbs); 2483 dev_info(dummy_dev(hcd_to_dummy_hcd(hcd)), "stopped\n"); 2484 } 2485 2486 /*-------------------------------------------------------------------------*/ 2487 2488 static int dummy_h_get_frame(struct usb_hcd *hcd) 2489 { 2490 return dummy_g_get_frame(NULL); 2491 } 2492 2493 static int dummy_setup(struct usb_hcd *hcd) 2494 { 2495 struct dummy *dum; 2496 2497 dum = *((void **)dev_get_platdata(hcd->self.controller)); 2498 hcd->self.sg_tablesize = ~0; 2499 if (usb_hcd_is_primary_hcd(hcd)) { 2500 dum->hs_hcd = hcd_to_dummy_hcd(hcd); 2501 dum->hs_hcd->dum = dum; 2502 /* 2503 * Mark the first roothub as being USB 2.0. 2504 * The USB 3.0 roothub will be registered later by 2505 * dummy_hcd_probe() 2506 */ 2507 hcd->speed = HCD_USB2; 2508 hcd->self.root_hub->speed = USB_SPEED_HIGH; 2509 } else { 2510 dum->ss_hcd = hcd_to_dummy_hcd(hcd); 2511 dum->ss_hcd->dum = dum; 2512 hcd->speed = HCD_USB3; 2513 hcd->self.root_hub->speed = USB_SPEED_SUPER; 2514 } 2515 return 0; 2516 } 2517 2518 /* Change a group of bulk endpoints to support multiple stream IDs */ 2519 static int dummy_alloc_streams(struct usb_hcd *hcd, struct usb_device *udev, 2520 struct usb_host_endpoint **eps, unsigned int num_eps, 2521 unsigned int num_streams, gfp_t mem_flags) 2522 { 2523 struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd); 2524 unsigned long flags; 2525 int max_stream; 2526 int ret_streams = num_streams; 2527 unsigned int index; 2528 unsigned int i; 2529 2530 if (!num_eps) 2531 return -EINVAL; 2532 2533 spin_lock_irqsave(&dum_hcd->dum->lock, flags); 2534 for (i = 0; i < num_eps; i++) { 2535 index = dummy_get_ep_idx(&eps[i]->desc); 2536 if ((1 << index) & dum_hcd->stream_en_ep) { 2537 ret_streams = -EINVAL; 2538 goto out; 2539 } 2540 max_stream = usb_ss_max_streams(&eps[i]->ss_ep_comp); 2541 if (!max_stream) { 2542 ret_streams = -EINVAL; 2543 goto out; 2544 } 2545 if (max_stream < ret_streams) { 2546 dev_dbg(dummy_dev(dum_hcd), "Ep 0x%x only supports %u " 2547 "stream IDs.\n", 2548 eps[i]->desc.bEndpointAddress, 2549 max_stream); 2550 ret_streams = max_stream; 2551 } 2552 } 2553 2554 for (i = 0; i < num_eps; i++) { 2555 index = dummy_get_ep_idx(&eps[i]->desc); 2556 dum_hcd->stream_en_ep |= 1 << index; 2557 set_max_streams_for_pipe(dum_hcd, 2558 usb_endpoint_num(&eps[i]->desc), ret_streams); 2559 } 2560 out: 2561 spin_unlock_irqrestore(&dum_hcd->dum->lock, flags); 2562 return ret_streams; 2563 } 2564 2565 /* Reverts a group of bulk endpoints back to not using stream IDs. */ 2566 static int dummy_free_streams(struct usb_hcd *hcd, struct usb_device *udev, 2567 struct usb_host_endpoint **eps, unsigned int num_eps, 2568 gfp_t mem_flags) 2569 { 2570 struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd); 2571 unsigned long flags; 2572 int ret; 2573 unsigned int index; 2574 unsigned int i; 2575 2576 spin_lock_irqsave(&dum_hcd->dum->lock, flags); 2577 for (i = 0; i < num_eps; i++) { 2578 index = dummy_get_ep_idx(&eps[i]->desc); 2579 if (!((1 << index) & dum_hcd->stream_en_ep)) { 2580 ret = -EINVAL; 2581 goto out; 2582 } 2583 } 2584 2585 for (i = 0; i < num_eps; i++) { 2586 index = dummy_get_ep_idx(&eps[i]->desc); 2587 dum_hcd->stream_en_ep &= ~(1 << index); 2588 set_max_streams_for_pipe(dum_hcd, 2589 usb_endpoint_num(&eps[i]->desc), 0); 2590 } 2591 ret = 0; 2592 out: 2593 spin_unlock_irqrestore(&dum_hcd->dum->lock, flags); 2594 return ret; 2595 } 2596 2597 static struct hc_driver dummy_hcd = { 2598 .description = (char *) driver_name, 2599 .product_desc = "Dummy host controller", 2600 .hcd_priv_size = sizeof(struct dummy_hcd), 2601 2602 .reset = dummy_setup, 2603 .start = dummy_start, 2604 .stop = dummy_stop, 2605 2606 .urb_enqueue = dummy_urb_enqueue, 2607 .urb_dequeue = dummy_urb_dequeue, 2608 2609 .get_frame_number = dummy_h_get_frame, 2610 2611 .hub_status_data = dummy_hub_status, 2612 .hub_control = dummy_hub_control, 2613 .bus_suspend = dummy_bus_suspend, 2614 .bus_resume = dummy_bus_resume, 2615 2616 .alloc_streams = dummy_alloc_streams, 2617 .free_streams = dummy_free_streams, 2618 }; 2619 2620 static int dummy_hcd_probe(struct platform_device *pdev) 2621 { 2622 struct dummy *dum; 2623 struct usb_hcd *hs_hcd; 2624 struct usb_hcd *ss_hcd; 2625 int retval; 2626 2627 dev_info(&pdev->dev, "%s, driver " DRIVER_VERSION "\n", driver_desc); 2628 dum = *((void **)dev_get_platdata(&pdev->dev)); 2629 2630 if (mod_data.is_super_speed) 2631 dummy_hcd.flags = HCD_USB3 | HCD_SHARED; 2632 else if (mod_data.is_high_speed) 2633 dummy_hcd.flags = HCD_USB2; 2634 else 2635 dummy_hcd.flags = HCD_USB11; 2636 hs_hcd = usb_create_hcd(&dummy_hcd, &pdev->dev, dev_name(&pdev->dev)); 2637 if (!hs_hcd) 2638 return -ENOMEM; 2639 hs_hcd->has_tt = 1; 2640 2641 retval = usb_add_hcd(hs_hcd, 0, 0); 2642 if (retval) 2643 goto put_usb2_hcd; 2644 2645 if (mod_data.is_super_speed) { 2646 ss_hcd = usb_create_shared_hcd(&dummy_hcd, &pdev->dev, 2647 dev_name(&pdev->dev), hs_hcd); 2648 if (!ss_hcd) { 2649 retval = -ENOMEM; 2650 goto dealloc_usb2_hcd; 2651 } 2652 2653 retval = usb_add_hcd(ss_hcd, 0, 0); 2654 if (retval) 2655 goto put_usb3_hcd; 2656 } 2657 return 0; 2658 2659 put_usb3_hcd: 2660 usb_put_hcd(ss_hcd); 2661 dealloc_usb2_hcd: 2662 usb_remove_hcd(hs_hcd); 2663 put_usb2_hcd: 2664 usb_put_hcd(hs_hcd); 2665 dum->hs_hcd = dum->ss_hcd = NULL; 2666 return retval; 2667 } 2668 2669 static int dummy_hcd_remove(struct platform_device *pdev) 2670 { 2671 struct dummy *dum; 2672 2673 dum = hcd_to_dummy_hcd(platform_get_drvdata(pdev))->dum; 2674 2675 if (dum->ss_hcd) { 2676 usb_remove_hcd(dummy_hcd_to_hcd(dum->ss_hcd)); 2677 usb_put_hcd(dummy_hcd_to_hcd(dum->ss_hcd)); 2678 } 2679 2680 usb_remove_hcd(dummy_hcd_to_hcd(dum->hs_hcd)); 2681 usb_put_hcd(dummy_hcd_to_hcd(dum->hs_hcd)); 2682 2683 dum->hs_hcd = NULL; 2684 dum->ss_hcd = NULL; 2685 2686 return 0; 2687 } 2688 2689 static int dummy_hcd_suspend(struct platform_device *pdev, pm_message_t state) 2690 { 2691 struct usb_hcd *hcd; 2692 struct dummy_hcd *dum_hcd; 2693 int rc = 0; 2694 2695 dev_dbg(&pdev->dev, "%s\n", __func__); 2696 2697 hcd = platform_get_drvdata(pdev); 2698 dum_hcd = hcd_to_dummy_hcd(hcd); 2699 if (dum_hcd->rh_state == DUMMY_RH_RUNNING) { 2700 dev_warn(&pdev->dev, "Root hub isn't suspended!\n"); 2701 rc = -EBUSY; 2702 } else 2703 clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags); 2704 return rc; 2705 } 2706 2707 static int dummy_hcd_resume(struct platform_device *pdev) 2708 { 2709 struct usb_hcd *hcd; 2710 2711 dev_dbg(&pdev->dev, "%s\n", __func__); 2712 2713 hcd = platform_get_drvdata(pdev); 2714 set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags); 2715 usb_hcd_poll_rh_status(hcd); 2716 return 0; 2717 } 2718 2719 static struct platform_driver dummy_hcd_driver = { 2720 .probe = dummy_hcd_probe, 2721 .remove = dummy_hcd_remove, 2722 .suspend = dummy_hcd_suspend, 2723 .resume = dummy_hcd_resume, 2724 .driver = { 2725 .name = (char *) driver_name, 2726 }, 2727 }; 2728 2729 /*-------------------------------------------------------------------------*/ 2730 #define MAX_NUM_UDC 2 2731 static struct platform_device *the_udc_pdev[MAX_NUM_UDC]; 2732 static struct platform_device *the_hcd_pdev[MAX_NUM_UDC]; 2733 2734 static int __init init(void) 2735 { 2736 int retval = -ENOMEM; 2737 int i; 2738 struct dummy *dum[MAX_NUM_UDC]; 2739 2740 if (usb_disabled()) 2741 return -ENODEV; 2742 2743 if (!mod_data.is_high_speed && mod_data.is_super_speed) 2744 return -EINVAL; 2745 2746 if (mod_data.num < 1 || mod_data.num > MAX_NUM_UDC) { 2747 pr_err("Number of emulated UDC must be in range of 1...%d\n", 2748 MAX_NUM_UDC); 2749 return -EINVAL; 2750 } 2751 2752 for (i = 0; i < mod_data.num; i++) { 2753 the_hcd_pdev[i] = platform_device_alloc(driver_name, i); 2754 if (!the_hcd_pdev[i]) { 2755 i--; 2756 while (i >= 0) 2757 platform_device_put(the_hcd_pdev[i--]); 2758 return retval; 2759 } 2760 } 2761 for (i = 0; i < mod_data.num; i++) { 2762 the_udc_pdev[i] = platform_device_alloc(gadget_name, i); 2763 if (!the_udc_pdev[i]) { 2764 i--; 2765 while (i >= 0) 2766 platform_device_put(the_udc_pdev[i--]); 2767 goto err_alloc_udc; 2768 } 2769 } 2770 for (i = 0; i < mod_data.num; i++) { 2771 dum[i] = kzalloc(sizeof(struct dummy), GFP_KERNEL); 2772 if (!dum[i]) { 2773 retval = -ENOMEM; 2774 goto err_add_pdata; 2775 } 2776 retval = platform_device_add_data(the_hcd_pdev[i], &dum[i], 2777 sizeof(void *)); 2778 if (retval) 2779 goto err_add_pdata; 2780 retval = platform_device_add_data(the_udc_pdev[i], &dum[i], 2781 sizeof(void *)); 2782 if (retval) 2783 goto err_add_pdata; 2784 } 2785 2786 retval = platform_driver_register(&dummy_hcd_driver); 2787 if (retval < 0) 2788 goto err_add_pdata; 2789 retval = platform_driver_register(&dummy_udc_driver); 2790 if (retval < 0) 2791 goto err_register_udc_driver; 2792 2793 for (i = 0; i < mod_data.num; i++) { 2794 retval = platform_device_add(the_hcd_pdev[i]); 2795 if (retval < 0) { 2796 i--; 2797 while (i >= 0) 2798 platform_device_del(the_hcd_pdev[i--]); 2799 goto err_add_hcd; 2800 } 2801 } 2802 for (i = 0; i < mod_data.num; i++) { 2803 if (!dum[i]->hs_hcd || 2804 (!dum[i]->ss_hcd && mod_data.is_super_speed)) { 2805 /* 2806 * The hcd was added successfully but its probe 2807 * function failed for some reason. 2808 */ 2809 retval = -EINVAL; 2810 goto err_add_udc; 2811 } 2812 } 2813 2814 for (i = 0; i < mod_data.num; i++) { 2815 retval = platform_device_add(the_udc_pdev[i]); 2816 if (retval < 0) { 2817 i--; 2818 while (i >= 0) 2819 platform_device_del(the_udc_pdev[i--]); 2820 goto err_add_udc; 2821 } 2822 } 2823 2824 for (i = 0; i < mod_data.num; i++) { 2825 if (!platform_get_drvdata(the_udc_pdev[i])) { 2826 /* 2827 * The udc was added successfully but its probe 2828 * function failed for some reason. 2829 */ 2830 retval = -EINVAL; 2831 goto err_probe_udc; 2832 } 2833 } 2834 return retval; 2835 2836 err_probe_udc: 2837 for (i = 0; i < mod_data.num; i++) 2838 platform_device_del(the_udc_pdev[i]); 2839 err_add_udc: 2840 for (i = 0; i < mod_data.num; i++) 2841 platform_device_del(the_hcd_pdev[i]); 2842 err_add_hcd: 2843 platform_driver_unregister(&dummy_udc_driver); 2844 err_register_udc_driver: 2845 platform_driver_unregister(&dummy_hcd_driver); 2846 err_add_pdata: 2847 for (i = 0; i < mod_data.num; i++) 2848 kfree(dum[i]); 2849 for (i = 0; i < mod_data.num; i++) 2850 platform_device_put(the_udc_pdev[i]); 2851 err_alloc_udc: 2852 for (i = 0; i < mod_data.num; i++) 2853 platform_device_put(the_hcd_pdev[i]); 2854 return retval; 2855 } 2856 module_init(init); 2857 2858 static void __exit cleanup(void) 2859 { 2860 int i; 2861 2862 for (i = 0; i < mod_data.num; i++) { 2863 struct dummy *dum; 2864 2865 dum = *((void **)dev_get_platdata(&the_udc_pdev[i]->dev)); 2866 2867 platform_device_unregister(the_udc_pdev[i]); 2868 platform_device_unregister(the_hcd_pdev[i]); 2869 kfree(dum); 2870 } 2871 platform_driver_unregister(&dummy_udc_driver); 2872 platform_driver_unregister(&dummy_hcd_driver); 2873 } 2874 module_exit(cleanup); 2875