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 struct urbp *next_frame_urbp; 241 242 u32 stream_en_ep; 243 u8 num_stream[30 / 2]; 244 245 unsigned active:1; 246 unsigned old_active:1; 247 unsigned resuming:1; 248 }; 249 250 struct dummy { 251 spinlock_t lock; 252 253 /* 254 * SLAVE/GADGET side support 255 */ 256 struct dummy_ep ep[DUMMY_ENDPOINTS]; 257 int address; 258 int callback_usage; 259 struct usb_gadget gadget; 260 struct usb_gadget_driver *driver; 261 struct dummy_request fifo_req; 262 u8 fifo_buf[FIFO_SIZE]; 263 u16 devstatus; 264 unsigned ints_enabled:1; 265 unsigned udc_suspended:1; 266 unsigned pullup:1; 267 268 /* 269 * MASTER/HOST side support 270 */ 271 struct dummy_hcd *hs_hcd; 272 struct dummy_hcd *ss_hcd; 273 }; 274 275 static inline struct dummy_hcd *hcd_to_dummy_hcd(struct usb_hcd *hcd) 276 { 277 return (struct dummy_hcd *) (hcd->hcd_priv); 278 } 279 280 static inline struct usb_hcd *dummy_hcd_to_hcd(struct dummy_hcd *dum) 281 { 282 return container_of((void *) dum, struct usb_hcd, hcd_priv); 283 } 284 285 static inline struct device *dummy_dev(struct dummy_hcd *dum) 286 { 287 return dummy_hcd_to_hcd(dum)->self.controller; 288 } 289 290 static inline struct device *udc_dev(struct dummy *dum) 291 { 292 return dum->gadget.dev.parent; 293 } 294 295 static inline struct dummy *ep_to_dummy(struct dummy_ep *ep) 296 { 297 return container_of(ep->gadget, struct dummy, gadget); 298 } 299 300 static inline struct dummy_hcd *gadget_to_dummy_hcd(struct usb_gadget *gadget) 301 { 302 struct dummy *dum = container_of(gadget, struct dummy, gadget); 303 if (dum->gadget.speed == USB_SPEED_SUPER) 304 return dum->ss_hcd; 305 else 306 return dum->hs_hcd; 307 } 308 309 static inline struct dummy *gadget_dev_to_dummy(struct device *dev) 310 { 311 return container_of(dev, struct dummy, gadget.dev); 312 } 313 314 /*-------------------------------------------------------------------------*/ 315 316 /* SLAVE/GADGET SIDE UTILITY ROUTINES */ 317 318 /* called with spinlock held */ 319 static void nuke(struct dummy *dum, struct dummy_ep *ep) 320 { 321 while (!list_empty(&ep->queue)) { 322 struct dummy_request *req; 323 324 req = list_entry(ep->queue.next, struct dummy_request, queue); 325 list_del_init(&req->queue); 326 req->req.status = -ESHUTDOWN; 327 328 spin_unlock(&dum->lock); 329 usb_gadget_giveback_request(&ep->ep, &req->req); 330 spin_lock(&dum->lock); 331 } 332 } 333 334 /* caller must hold lock */ 335 static void stop_activity(struct dummy *dum) 336 { 337 int i; 338 339 /* prevent any more requests */ 340 dum->address = 0; 341 342 /* The timer is left running so that outstanding URBs can fail */ 343 344 /* nuke any pending requests first, so driver i/o is quiesced */ 345 for (i = 0; i < DUMMY_ENDPOINTS; ++i) 346 nuke(dum, &dum->ep[i]); 347 348 /* driver now does any non-usb quiescing necessary */ 349 } 350 351 /** 352 * set_link_state_by_speed() - Sets the current state of the link according to 353 * the hcd speed 354 * @dum_hcd: pointer to the dummy_hcd structure to update the link state for 355 * 356 * This function updates the port_status according to the link state and the 357 * speed of the hcd. 358 */ 359 static void set_link_state_by_speed(struct dummy_hcd *dum_hcd) 360 { 361 struct dummy *dum = dum_hcd->dum; 362 363 if (dummy_hcd_to_hcd(dum_hcd)->speed == HCD_USB3) { 364 if ((dum_hcd->port_status & USB_SS_PORT_STAT_POWER) == 0) { 365 dum_hcd->port_status = 0; 366 } else if (!dum->pullup || dum->udc_suspended) { 367 /* UDC suspend must cause a disconnect */ 368 dum_hcd->port_status &= ~(USB_PORT_STAT_CONNECTION | 369 USB_PORT_STAT_ENABLE); 370 if ((dum_hcd->old_status & 371 USB_PORT_STAT_CONNECTION) != 0) 372 dum_hcd->port_status |= 373 (USB_PORT_STAT_C_CONNECTION << 16); 374 } else { 375 /* device is connected and not suspended */ 376 dum_hcd->port_status |= (USB_PORT_STAT_CONNECTION | 377 USB_PORT_STAT_SPEED_5GBPS) ; 378 if ((dum_hcd->old_status & 379 USB_PORT_STAT_CONNECTION) == 0) 380 dum_hcd->port_status |= 381 (USB_PORT_STAT_C_CONNECTION << 16); 382 if ((dum_hcd->port_status & USB_PORT_STAT_ENABLE) && 383 (dum_hcd->port_status & 384 USB_PORT_STAT_LINK_STATE) == USB_SS_PORT_LS_U0 && 385 dum_hcd->rh_state != DUMMY_RH_SUSPENDED) 386 dum_hcd->active = 1; 387 } 388 } else { 389 if ((dum_hcd->port_status & USB_PORT_STAT_POWER) == 0) { 390 dum_hcd->port_status = 0; 391 } else if (!dum->pullup || dum->udc_suspended) { 392 /* UDC suspend must cause a disconnect */ 393 dum_hcd->port_status &= ~(USB_PORT_STAT_CONNECTION | 394 USB_PORT_STAT_ENABLE | 395 USB_PORT_STAT_LOW_SPEED | 396 USB_PORT_STAT_HIGH_SPEED | 397 USB_PORT_STAT_SUSPEND); 398 if ((dum_hcd->old_status & 399 USB_PORT_STAT_CONNECTION) != 0) 400 dum_hcd->port_status |= 401 (USB_PORT_STAT_C_CONNECTION << 16); 402 } else { 403 dum_hcd->port_status |= USB_PORT_STAT_CONNECTION; 404 if ((dum_hcd->old_status & 405 USB_PORT_STAT_CONNECTION) == 0) 406 dum_hcd->port_status |= 407 (USB_PORT_STAT_C_CONNECTION << 16); 408 if ((dum_hcd->port_status & USB_PORT_STAT_ENABLE) == 0) 409 dum_hcd->port_status &= ~USB_PORT_STAT_SUSPEND; 410 else if ((dum_hcd->port_status & 411 USB_PORT_STAT_SUSPEND) == 0 && 412 dum_hcd->rh_state != DUMMY_RH_SUSPENDED) 413 dum_hcd->active = 1; 414 } 415 } 416 } 417 418 /* caller must hold lock */ 419 static void set_link_state(struct dummy_hcd *dum_hcd) 420 { 421 struct dummy *dum = dum_hcd->dum; 422 unsigned int power_bit; 423 424 dum_hcd->active = 0; 425 if (dum->pullup) 426 if ((dummy_hcd_to_hcd(dum_hcd)->speed == HCD_USB3 && 427 dum->gadget.speed != USB_SPEED_SUPER) || 428 (dummy_hcd_to_hcd(dum_hcd)->speed != HCD_USB3 && 429 dum->gadget.speed == USB_SPEED_SUPER)) 430 return; 431 432 set_link_state_by_speed(dum_hcd); 433 power_bit = (dummy_hcd_to_hcd(dum_hcd)->speed == HCD_USB3 ? 434 USB_SS_PORT_STAT_POWER : USB_PORT_STAT_POWER); 435 436 if ((dum_hcd->port_status & USB_PORT_STAT_ENABLE) == 0 || 437 dum_hcd->active) 438 dum_hcd->resuming = 0; 439 440 /* Currently !connected or in reset */ 441 if ((dum_hcd->port_status & power_bit) == 0 || 442 (dum_hcd->port_status & USB_PORT_STAT_RESET) != 0) { 443 unsigned int disconnect = power_bit & 444 dum_hcd->old_status & (~dum_hcd->port_status); 445 unsigned int reset = USB_PORT_STAT_RESET & 446 (~dum_hcd->old_status) & dum_hcd->port_status; 447 448 /* Report reset and disconnect events to the driver */ 449 if (dum->ints_enabled && (disconnect || reset)) { 450 stop_activity(dum); 451 ++dum->callback_usage; 452 spin_unlock(&dum->lock); 453 if (reset) 454 usb_gadget_udc_reset(&dum->gadget, dum->driver); 455 else 456 dum->driver->disconnect(&dum->gadget); 457 spin_lock(&dum->lock); 458 --dum->callback_usage; 459 } 460 } else if (dum_hcd->active != dum_hcd->old_active && 461 dum->ints_enabled) { 462 ++dum->callback_usage; 463 spin_unlock(&dum->lock); 464 if (dum_hcd->old_active && dum->driver->suspend) 465 dum->driver->suspend(&dum->gadget); 466 else if (!dum_hcd->old_active && dum->driver->resume) 467 dum->driver->resume(&dum->gadget); 468 spin_lock(&dum->lock); 469 --dum->callback_usage; 470 } 471 472 dum_hcd->old_status = dum_hcd->port_status; 473 dum_hcd->old_active = dum_hcd->active; 474 } 475 476 /*-------------------------------------------------------------------------*/ 477 478 /* SLAVE/GADGET SIDE DRIVER 479 * 480 * This only tracks gadget state. All the work is done when the host 481 * side tries some (emulated) i/o operation. Real device controller 482 * drivers would do real i/o using dma, fifos, irqs, timers, etc. 483 */ 484 485 #define is_enabled(dum) \ 486 (dum->port_status & USB_PORT_STAT_ENABLE) 487 488 static int dummy_enable(struct usb_ep *_ep, 489 const struct usb_endpoint_descriptor *desc) 490 { 491 struct dummy *dum; 492 struct dummy_hcd *dum_hcd; 493 struct dummy_ep *ep; 494 unsigned max; 495 int retval; 496 497 ep = usb_ep_to_dummy_ep(_ep); 498 if (!_ep || !desc || ep->desc || _ep->name == ep0name 499 || desc->bDescriptorType != USB_DT_ENDPOINT) 500 return -EINVAL; 501 dum = ep_to_dummy(ep); 502 if (!dum->driver) 503 return -ESHUTDOWN; 504 505 dum_hcd = gadget_to_dummy_hcd(&dum->gadget); 506 if (!is_enabled(dum_hcd)) 507 return -ESHUTDOWN; 508 509 /* 510 * For HS/FS devices only bits 0..10 of the wMaxPacketSize represent the 511 * maximum packet size. 512 * For SS devices the wMaxPacketSize is limited by 1024. 513 */ 514 max = usb_endpoint_maxp(desc); 515 516 /* drivers must not request bad settings, since lower levels 517 * (hardware or its drivers) may not check. some endpoints 518 * can't do iso, many have maxpacket limitations, etc. 519 * 520 * since this "hardware" driver is here to help debugging, we 521 * have some extra sanity checks. (there could be more though, 522 * especially for "ep9out" style fixed function ones.) 523 */ 524 retval = -EINVAL; 525 switch (usb_endpoint_type(desc)) { 526 case USB_ENDPOINT_XFER_BULK: 527 if (strstr(ep->ep.name, "-iso") 528 || strstr(ep->ep.name, "-int")) { 529 goto done; 530 } 531 switch (dum->gadget.speed) { 532 case USB_SPEED_SUPER: 533 if (max == 1024) 534 break; 535 goto done; 536 case USB_SPEED_HIGH: 537 if (max == 512) 538 break; 539 goto done; 540 case USB_SPEED_FULL: 541 if (max == 8 || max == 16 || max == 32 || max == 64) 542 /* we'll fake any legal size */ 543 break; 544 /* save a return statement */ 545 default: 546 goto done; 547 } 548 break; 549 case USB_ENDPOINT_XFER_INT: 550 if (strstr(ep->ep.name, "-iso")) /* bulk is ok */ 551 goto done; 552 /* real hardware might not handle all packet sizes */ 553 switch (dum->gadget.speed) { 554 case USB_SPEED_SUPER: 555 case USB_SPEED_HIGH: 556 if (max <= 1024) 557 break; 558 /* save a return statement */ 559 case USB_SPEED_FULL: 560 if (max <= 64) 561 break; 562 /* save a return statement */ 563 default: 564 if (max <= 8) 565 break; 566 goto done; 567 } 568 break; 569 case USB_ENDPOINT_XFER_ISOC: 570 if (strstr(ep->ep.name, "-bulk") 571 || strstr(ep->ep.name, "-int")) 572 goto done; 573 /* real hardware might not handle all packet sizes */ 574 switch (dum->gadget.speed) { 575 case USB_SPEED_SUPER: 576 case USB_SPEED_HIGH: 577 if (max <= 1024) 578 break; 579 /* save a return statement */ 580 case USB_SPEED_FULL: 581 if (max <= 1023) 582 break; 583 /* save a return statement */ 584 default: 585 goto done; 586 } 587 break; 588 default: 589 /* few chips support control except on ep0 */ 590 goto done; 591 } 592 593 _ep->maxpacket = max; 594 if (usb_ss_max_streams(_ep->comp_desc)) { 595 if (!usb_endpoint_xfer_bulk(desc)) { 596 dev_err(udc_dev(dum), "Can't enable stream support on " 597 "non-bulk ep %s\n", _ep->name); 598 return -EINVAL; 599 } 600 ep->stream_en = 1; 601 } 602 ep->desc = desc; 603 604 dev_dbg(udc_dev(dum), "enabled %s (ep%d%s-%s) maxpacket %d stream %s\n", 605 _ep->name, 606 desc->bEndpointAddress & 0x0f, 607 (desc->bEndpointAddress & USB_DIR_IN) ? "in" : "out", 608 ({ char *val; 609 switch (usb_endpoint_type(desc)) { 610 case USB_ENDPOINT_XFER_BULK: 611 val = "bulk"; 612 break; 613 case USB_ENDPOINT_XFER_ISOC: 614 val = "iso"; 615 break; 616 case USB_ENDPOINT_XFER_INT: 617 val = "intr"; 618 break; 619 default: 620 val = "ctrl"; 621 break; 622 } val; }), 623 max, ep->stream_en ? "enabled" : "disabled"); 624 625 /* at this point real hardware should be NAKing transfers 626 * to that endpoint, until a buffer is queued to it. 627 */ 628 ep->halted = ep->wedged = 0; 629 retval = 0; 630 done: 631 return retval; 632 } 633 634 static int dummy_disable(struct usb_ep *_ep) 635 { 636 struct dummy_ep *ep; 637 struct dummy *dum; 638 unsigned long flags; 639 640 ep = usb_ep_to_dummy_ep(_ep); 641 if (!_ep || !ep->desc || _ep->name == ep0name) 642 return -EINVAL; 643 dum = ep_to_dummy(ep); 644 645 spin_lock_irqsave(&dum->lock, flags); 646 ep->desc = NULL; 647 ep->stream_en = 0; 648 nuke(dum, ep); 649 spin_unlock_irqrestore(&dum->lock, flags); 650 651 dev_dbg(udc_dev(dum), "disabled %s\n", _ep->name); 652 return 0; 653 } 654 655 static struct usb_request *dummy_alloc_request(struct usb_ep *_ep, 656 gfp_t mem_flags) 657 { 658 struct dummy_request *req; 659 660 if (!_ep) 661 return NULL; 662 663 req = kzalloc(sizeof(*req), mem_flags); 664 if (!req) 665 return NULL; 666 INIT_LIST_HEAD(&req->queue); 667 return &req->req; 668 } 669 670 static void dummy_free_request(struct usb_ep *_ep, struct usb_request *_req) 671 { 672 struct dummy_request *req; 673 674 if (!_ep || !_req) { 675 WARN_ON(1); 676 return; 677 } 678 679 req = usb_request_to_dummy_request(_req); 680 WARN_ON(!list_empty(&req->queue)); 681 kfree(req); 682 } 683 684 static void fifo_complete(struct usb_ep *ep, struct usb_request *req) 685 { 686 } 687 688 static int dummy_queue(struct usb_ep *_ep, struct usb_request *_req, 689 gfp_t mem_flags) 690 { 691 struct dummy_ep *ep; 692 struct dummy_request *req; 693 struct dummy *dum; 694 struct dummy_hcd *dum_hcd; 695 unsigned long flags; 696 697 req = usb_request_to_dummy_request(_req); 698 if (!_req || !list_empty(&req->queue) || !_req->complete) 699 return -EINVAL; 700 701 ep = usb_ep_to_dummy_ep(_ep); 702 if (!_ep || (!ep->desc && _ep->name != ep0name)) 703 return -EINVAL; 704 705 dum = ep_to_dummy(ep); 706 dum_hcd = gadget_to_dummy_hcd(&dum->gadget); 707 if (!dum->driver || !is_enabled(dum_hcd)) 708 return -ESHUTDOWN; 709 710 #if 0 711 dev_dbg(udc_dev(dum), "ep %p queue req %p to %s, len %d buf %p\n", 712 ep, _req, _ep->name, _req->length, _req->buf); 713 #endif 714 _req->status = -EINPROGRESS; 715 _req->actual = 0; 716 spin_lock_irqsave(&dum->lock, flags); 717 718 /* implement an emulated single-request FIFO */ 719 if (ep->desc && (ep->desc->bEndpointAddress & USB_DIR_IN) && 720 list_empty(&dum->fifo_req.queue) && 721 list_empty(&ep->queue) && 722 _req->length <= FIFO_SIZE) { 723 req = &dum->fifo_req; 724 req->req = *_req; 725 req->req.buf = dum->fifo_buf; 726 memcpy(dum->fifo_buf, _req->buf, _req->length); 727 req->req.context = dum; 728 req->req.complete = fifo_complete; 729 730 list_add_tail(&req->queue, &ep->queue); 731 spin_unlock(&dum->lock); 732 _req->actual = _req->length; 733 _req->status = 0; 734 usb_gadget_giveback_request(_ep, _req); 735 spin_lock(&dum->lock); 736 } else 737 list_add_tail(&req->queue, &ep->queue); 738 spin_unlock_irqrestore(&dum->lock, flags); 739 740 /* real hardware would likely enable transfers here, in case 741 * it'd been left NAKing. 742 */ 743 return 0; 744 } 745 746 static int dummy_dequeue(struct usb_ep *_ep, struct usb_request *_req) 747 { 748 struct dummy_ep *ep; 749 struct dummy *dum; 750 int retval = -EINVAL; 751 unsigned long flags; 752 struct dummy_request *req = NULL; 753 754 if (!_ep || !_req) 755 return retval; 756 ep = usb_ep_to_dummy_ep(_ep); 757 dum = ep_to_dummy(ep); 758 759 if (!dum->driver) 760 return -ESHUTDOWN; 761 762 local_irq_save(flags); 763 spin_lock(&dum->lock); 764 list_for_each_entry(req, &ep->queue, queue) { 765 if (&req->req == _req) { 766 list_del_init(&req->queue); 767 _req->status = -ECONNRESET; 768 retval = 0; 769 break; 770 } 771 } 772 spin_unlock(&dum->lock); 773 774 if (retval == 0) { 775 dev_dbg(udc_dev(dum), 776 "dequeued req %p from %s, len %d buf %p\n", 777 req, _ep->name, _req->length, _req->buf); 778 usb_gadget_giveback_request(_ep, _req); 779 } 780 local_irq_restore(flags); 781 return retval; 782 } 783 784 static int 785 dummy_set_halt_and_wedge(struct usb_ep *_ep, int value, int wedged) 786 { 787 struct dummy_ep *ep; 788 struct dummy *dum; 789 790 if (!_ep) 791 return -EINVAL; 792 ep = usb_ep_to_dummy_ep(_ep); 793 dum = ep_to_dummy(ep); 794 if (!dum->driver) 795 return -ESHUTDOWN; 796 if (!value) 797 ep->halted = ep->wedged = 0; 798 else if (ep->desc && (ep->desc->bEndpointAddress & USB_DIR_IN) && 799 !list_empty(&ep->queue)) 800 return -EAGAIN; 801 else { 802 ep->halted = 1; 803 if (wedged) 804 ep->wedged = 1; 805 } 806 /* FIXME clear emulated data toggle too */ 807 return 0; 808 } 809 810 static int 811 dummy_set_halt(struct usb_ep *_ep, int value) 812 { 813 return dummy_set_halt_and_wedge(_ep, value, 0); 814 } 815 816 static int dummy_set_wedge(struct usb_ep *_ep) 817 { 818 if (!_ep || _ep->name == ep0name) 819 return -EINVAL; 820 return dummy_set_halt_and_wedge(_ep, 1, 1); 821 } 822 823 static const struct usb_ep_ops dummy_ep_ops = { 824 .enable = dummy_enable, 825 .disable = dummy_disable, 826 827 .alloc_request = dummy_alloc_request, 828 .free_request = dummy_free_request, 829 830 .queue = dummy_queue, 831 .dequeue = dummy_dequeue, 832 833 .set_halt = dummy_set_halt, 834 .set_wedge = dummy_set_wedge, 835 }; 836 837 /*-------------------------------------------------------------------------*/ 838 839 /* there are both host and device side versions of this call ... */ 840 static int dummy_g_get_frame(struct usb_gadget *_gadget) 841 { 842 struct timespec64 ts64; 843 844 ktime_get_ts64(&ts64); 845 return ts64.tv_nsec / NSEC_PER_MSEC; 846 } 847 848 static int dummy_wakeup(struct usb_gadget *_gadget) 849 { 850 struct dummy_hcd *dum_hcd; 851 852 dum_hcd = gadget_to_dummy_hcd(_gadget); 853 if (!(dum_hcd->dum->devstatus & ((1 << USB_DEVICE_B_HNP_ENABLE) 854 | (1 << USB_DEVICE_REMOTE_WAKEUP)))) 855 return -EINVAL; 856 if ((dum_hcd->port_status & USB_PORT_STAT_CONNECTION) == 0) 857 return -ENOLINK; 858 if ((dum_hcd->port_status & USB_PORT_STAT_SUSPEND) == 0 && 859 dum_hcd->rh_state != DUMMY_RH_SUSPENDED) 860 return -EIO; 861 862 /* FIXME: What if the root hub is suspended but the port isn't? */ 863 864 /* hub notices our request, issues downstream resume, etc */ 865 dum_hcd->resuming = 1; 866 dum_hcd->re_timeout = jiffies + msecs_to_jiffies(20); 867 mod_timer(&dummy_hcd_to_hcd(dum_hcd)->rh_timer, dum_hcd->re_timeout); 868 return 0; 869 } 870 871 static int dummy_set_selfpowered(struct usb_gadget *_gadget, int value) 872 { 873 struct dummy *dum; 874 875 _gadget->is_selfpowered = (value != 0); 876 dum = gadget_to_dummy_hcd(_gadget)->dum; 877 if (value) 878 dum->devstatus |= (1 << USB_DEVICE_SELF_POWERED); 879 else 880 dum->devstatus &= ~(1 << USB_DEVICE_SELF_POWERED); 881 return 0; 882 } 883 884 static void dummy_udc_update_ep0(struct dummy *dum) 885 { 886 if (dum->gadget.speed == USB_SPEED_SUPER) 887 dum->ep[0].ep.maxpacket = 9; 888 else 889 dum->ep[0].ep.maxpacket = 64; 890 } 891 892 static int dummy_pullup(struct usb_gadget *_gadget, int value) 893 { 894 struct dummy_hcd *dum_hcd; 895 struct dummy *dum; 896 unsigned long flags; 897 898 dum = gadget_dev_to_dummy(&_gadget->dev); 899 dum_hcd = gadget_to_dummy_hcd(_gadget); 900 901 spin_lock_irqsave(&dum->lock, flags); 902 dum->pullup = (value != 0); 903 set_link_state(dum_hcd); 904 spin_unlock_irqrestore(&dum->lock, flags); 905 906 usb_hcd_poll_rh_status(dummy_hcd_to_hcd(dum_hcd)); 907 return 0; 908 } 909 910 static void dummy_udc_set_speed(struct usb_gadget *_gadget, 911 enum usb_device_speed speed) 912 { 913 struct dummy *dum; 914 915 dum = gadget_dev_to_dummy(&_gadget->dev); 916 917 if (mod_data.is_super_speed) 918 dum->gadget.speed = min_t(u8, USB_SPEED_SUPER, speed); 919 else if (mod_data.is_high_speed) 920 dum->gadget.speed = min_t(u8, USB_SPEED_HIGH, speed); 921 else 922 dum->gadget.speed = USB_SPEED_FULL; 923 924 dummy_udc_update_ep0(dum); 925 926 if (dum->gadget.speed < speed) 927 dev_dbg(udc_dev(dum), "This device can perform faster" 928 " if you connect it to a %s port...\n", 929 usb_speed_string(speed)); 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(unsigned long _dum_hcd) 1763 { 1764 struct dummy_hcd *dum_hcd = (struct dummy_hcd *) _dum_hcd; 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 switch (dum->gadget.speed) { 1773 case USB_SPEED_LOW: 1774 total = 8/*bytes*/ * 12/*packets*/; 1775 break; 1776 case USB_SPEED_FULL: 1777 total = 64/*bytes*/ * 19/*packets*/; 1778 break; 1779 case USB_SPEED_HIGH: 1780 total = 512/*bytes*/ * 13/*packets*/ * 8/*uframes*/; 1781 break; 1782 case USB_SPEED_SUPER: 1783 /* Bus speed is 500000 bytes/ms, so use a little less */ 1784 total = 490000; 1785 break; 1786 default: 1787 dev_err(dummy_dev(dum_hcd), "bogus device speed\n"); 1788 return; 1789 } 1790 1791 /* FIXME if HZ != 1000 this will probably misbehave ... */ 1792 1793 /* look at each urb queued by the host side driver */ 1794 spin_lock_irqsave(&dum->lock, flags); 1795 1796 if (!dum_hcd->udev) { 1797 dev_err(dummy_dev(dum_hcd), 1798 "timer fired with no URBs pending?\n"); 1799 spin_unlock_irqrestore(&dum->lock, flags); 1800 return; 1801 } 1802 dum_hcd->next_frame_urbp = NULL; 1803 1804 for (i = 0; i < DUMMY_ENDPOINTS; i++) { 1805 if (!ep_info[i].name) 1806 break; 1807 dum->ep[i].already_seen = 0; 1808 } 1809 1810 restart: 1811 list_for_each_entry_safe(urbp, tmp, &dum_hcd->urbp_list, urbp_list) { 1812 struct urb *urb; 1813 struct dummy_request *req; 1814 u8 address; 1815 struct dummy_ep *ep = NULL; 1816 int type; 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 type = usb_pipetype(urb->pipe); 1829 1830 /* used up this frame's non-periodic bandwidth? 1831 * FIXME there's infinite bandwidth for control and 1832 * periodic transfers ... unrealistic. 1833 */ 1834 if (total <= 0 && type == PIPE_BULK) 1835 continue; 1836 1837 /* find the gadget's ep for this request (if configured) */ 1838 address = usb_pipeendpoint (urb->pipe); 1839 if (usb_pipein(urb->pipe)) 1840 address |= USB_DIR_IN; 1841 ep = find_endpoint(dum, address); 1842 if (!ep) { 1843 /* set_configuration() disagreement */ 1844 dev_dbg(dummy_dev(dum_hcd), 1845 "no ep configured for urb %p\n", 1846 urb); 1847 status = -EPROTO; 1848 goto return_urb; 1849 } 1850 1851 if (ep->already_seen) 1852 continue; 1853 ep->already_seen = 1; 1854 if (ep == &dum->ep[0] && urb->error_count) { 1855 ep->setup_stage = 1; /* a new urb */ 1856 urb->error_count = 0; 1857 } 1858 if (ep->halted && !ep->setup_stage) { 1859 /* NOTE: must not be iso! */ 1860 dev_dbg(dummy_dev(dum_hcd), "ep %s halted, urb %p\n", 1861 ep->ep.name, urb); 1862 status = -EPIPE; 1863 goto return_urb; 1864 } 1865 /* FIXME make sure both ends agree on maxpacket */ 1866 1867 /* handle control requests */ 1868 if (ep == &dum->ep[0] && ep->setup_stage) { 1869 struct usb_ctrlrequest setup; 1870 int value = 1; 1871 1872 setup = *(struct usb_ctrlrequest *) urb->setup_packet; 1873 /* paranoia, in case of stale queued data */ 1874 list_for_each_entry(req, &ep->queue, queue) { 1875 list_del_init(&req->queue); 1876 req->req.status = -EOVERFLOW; 1877 dev_dbg(udc_dev(dum), "stale req = %p\n", 1878 req); 1879 1880 spin_unlock(&dum->lock); 1881 usb_gadget_giveback_request(&ep->ep, &req->req); 1882 spin_lock(&dum->lock); 1883 ep->already_seen = 0; 1884 goto restart; 1885 } 1886 1887 /* gadget driver never sees set_address or operations 1888 * on standard feature flags. some hardware doesn't 1889 * even expose them. 1890 */ 1891 ep->last_io = jiffies; 1892 ep->setup_stage = 0; 1893 ep->halted = 0; 1894 1895 value = handle_control_request(dum_hcd, urb, &setup, 1896 &status); 1897 1898 /* gadget driver handles all other requests. block 1899 * until setup() returns; no reentrancy issues etc. 1900 */ 1901 if (value > 0) { 1902 ++dum->callback_usage; 1903 spin_unlock(&dum->lock); 1904 value = dum->driver->setup(&dum->gadget, 1905 &setup); 1906 spin_lock(&dum->lock); 1907 --dum->callback_usage; 1908 1909 if (value >= 0) { 1910 /* no delays (max 64KB data stage) */ 1911 limit = 64*1024; 1912 goto treat_control_like_bulk; 1913 } 1914 /* error, see below */ 1915 } 1916 1917 if (value < 0) { 1918 if (value != -EOPNOTSUPP) 1919 dev_dbg(udc_dev(dum), 1920 "setup --> %d\n", 1921 value); 1922 status = -EPIPE; 1923 urb->actual_length = 0; 1924 } 1925 1926 goto return_urb; 1927 } 1928 1929 /* non-control requests */ 1930 limit = total; 1931 switch (usb_pipetype(urb->pipe)) { 1932 case PIPE_ISOCHRONOUS: 1933 /* FIXME 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 = -ENOSYS; 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 dum_hcd->dum->gadget.speed = 2185 USB_SPEED_FULL; 2186 break; 2187 } 2188 } 2189 } 2190 } 2191 set_link_state(dum_hcd); 2192 ((__le16 *) buf)[0] = cpu_to_le16(dum_hcd->port_status); 2193 ((__le16 *) buf)[1] = cpu_to_le16(dum_hcd->port_status >> 16); 2194 break; 2195 case SetHubFeature: 2196 retval = -EPIPE; 2197 break; 2198 case SetPortFeature: 2199 switch (wValue) { 2200 case USB_PORT_FEAT_LINK_STATE: 2201 if (hcd->speed != HCD_USB3) { 2202 dev_dbg(dummy_dev(dum_hcd), 2203 "USB_PORT_FEAT_LINK_STATE req not " 2204 "supported for USB 2.0 roothub\n"); 2205 goto error; 2206 } 2207 /* 2208 * Since this is dummy we don't have an actual link so 2209 * there is nothing to do for the SET_LINK_STATE cmd 2210 */ 2211 break; 2212 case USB_PORT_FEAT_U1_TIMEOUT: 2213 case USB_PORT_FEAT_U2_TIMEOUT: 2214 /* TODO: add suspend/resume support! */ 2215 if (hcd->speed != HCD_USB3) { 2216 dev_dbg(dummy_dev(dum_hcd), 2217 "USB_PORT_FEAT_U1/2_TIMEOUT req not " 2218 "supported for USB 2.0 roothub\n"); 2219 goto error; 2220 } 2221 break; 2222 case USB_PORT_FEAT_SUSPEND: 2223 /* Applicable only for USB2.0 hub */ 2224 if (hcd->speed == HCD_USB3) { 2225 dev_dbg(dummy_dev(dum_hcd), 2226 "USB_PORT_FEAT_SUSPEND req not " 2227 "supported for USB 3.0 roothub\n"); 2228 goto error; 2229 } 2230 if (dum_hcd->active) { 2231 dum_hcd->port_status |= USB_PORT_STAT_SUSPEND; 2232 2233 /* HNP would happen here; for now we 2234 * assume b_bus_req is always true. 2235 */ 2236 set_link_state(dum_hcd); 2237 if (((1 << USB_DEVICE_B_HNP_ENABLE) 2238 & dum_hcd->dum->devstatus) != 0) 2239 dev_dbg(dummy_dev(dum_hcd), 2240 "no HNP yet!\n"); 2241 } 2242 break; 2243 case USB_PORT_FEAT_POWER: 2244 if (hcd->speed == HCD_USB3) 2245 dum_hcd->port_status |= USB_SS_PORT_STAT_POWER; 2246 else 2247 dum_hcd->port_status |= USB_PORT_STAT_POWER; 2248 set_link_state(dum_hcd); 2249 break; 2250 case USB_PORT_FEAT_BH_PORT_RESET: 2251 /* Applicable only for USB3.0 hub */ 2252 if (hcd->speed != HCD_USB3) { 2253 dev_dbg(dummy_dev(dum_hcd), 2254 "USB_PORT_FEAT_BH_PORT_RESET req not " 2255 "supported for USB 2.0 roothub\n"); 2256 goto error; 2257 } 2258 /* FALLS THROUGH */ 2259 case USB_PORT_FEAT_RESET: 2260 /* if it's already enabled, disable */ 2261 if (hcd->speed == HCD_USB3) { 2262 dum_hcd->port_status = 0; 2263 dum_hcd->port_status = 2264 (USB_SS_PORT_STAT_POWER | 2265 USB_PORT_STAT_CONNECTION | 2266 USB_PORT_STAT_RESET); 2267 } else 2268 dum_hcd->port_status &= ~(USB_PORT_STAT_ENABLE 2269 | USB_PORT_STAT_LOW_SPEED 2270 | USB_PORT_STAT_HIGH_SPEED); 2271 /* 2272 * We want to reset device status. All but the 2273 * Self powered feature 2274 */ 2275 dum_hcd->dum->devstatus &= 2276 (1 << USB_DEVICE_SELF_POWERED); 2277 /* 2278 * FIXME USB3.0: what is the correct reset signaling 2279 * interval? Is it still 50msec as for HS? 2280 */ 2281 dum_hcd->re_timeout = jiffies + msecs_to_jiffies(50); 2282 /* FALLS THROUGH */ 2283 default: 2284 if (hcd->speed == HCD_USB3) { 2285 if ((dum_hcd->port_status & 2286 USB_SS_PORT_STAT_POWER) != 0) { 2287 dum_hcd->port_status |= (1 << wValue); 2288 } 2289 } else 2290 if ((dum_hcd->port_status & 2291 USB_PORT_STAT_POWER) != 0) { 2292 dum_hcd->port_status |= (1 << wValue); 2293 } 2294 set_link_state(dum_hcd); 2295 } 2296 break; 2297 case GetPortErrorCount: 2298 if (hcd->speed != HCD_USB3) { 2299 dev_dbg(dummy_dev(dum_hcd), 2300 "GetPortErrorCount req not " 2301 "supported for USB 2.0 roothub\n"); 2302 goto error; 2303 } 2304 /* We'll always return 0 since this is a dummy hub */ 2305 *(__le32 *) buf = cpu_to_le32(0); 2306 break; 2307 case SetHubDepth: 2308 if (hcd->speed != HCD_USB3) { 2309 dev_dbg(dummy_dev(dum_hcd), 2310 "SetHubDepth req not supported for " 2311 "USB 2.0 roothub\n"); 2312 goto error; 2313 } 2314 break; 2315 default: 2316 dev_dbg(dummy_dev(dum_hcd), 2317 "hub control req%04x v%04x i%04x l%d\n", 2318 typeReq, wValue, wIndex, wLength); 2319 error: 2320 /* "protocol stall" on error */ 2321 retval = -EPIPE; 2322 } 2323 spin_unlock_irqrestore(&dum_hcd->dum->lock, flags); 2324 2325 if ((dum_hcd->port_status & PORT_C_MASK) != 0) 2326 usb_hcd_poll_rh_status(hcd); 2327 return retval; 2328 } 2329 2330 static int dummy_bus_suspend(struct usb_hcd *hcd) 2331 { 2332 struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd); 2333 2334 dev_dbg(&hcd->self.root_hub->dev, "%s\n", __func__); 2335 2336 spin_lock_irq(&dum_hcd->dum->lock); 2337 dum_hcd->rh_state = DUMMY_RH_SUSPENDED; 2338 set_link_state(dum_hcd); 2339 hcd->state = HC_STATE_SUSPENDED; 2340 spin_unlock_irq(&dum_hcd->dum->lock); 2341 return 0; 2342 } 2343 2344 static int dummy_bus_resume(struct usb_hcd *hcd) 2345 { 2346 struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd); 2347 int rc = 0; 2348 2349 dev_dbg(&hcd->self.root_hub->dev, "%s\n", __func__); 2350 2351 spin_lock_irq(&dum_hcd->dum->lock); 2352 if (!HCD_HW_ACCESSIBLE(hcd)) { 2353 rc = -ESHUTDOWN; 2354 } else { 2355 dum_hcd->rh_state = DUMMY_RH_RUNNING; 2356 set_link_state(dum_hcd); 2357 if (!list_empty(&dum_hcd->urbp_list)) 2358 mod_timer(&dum_hcd->timer, jiffies); 2359 hcd->state = HC_STATE_RUNNING; 2360 } 2361 spin_unlock_irq(&dum_hcd->dum->lock); 2362 return rc; 2363 } 2364 2365 /*-------------------------------------------------------------------------*/ 2366 2367 static inline ssize_t show_urb(char *buf, size_t size, struct urb *urb) 2368 { 2369 int ep = usb_pipeendpoint(urb->pipe); 2370 2371 return snprintf(buf, size, 2372 "urb/%p %s ep%d%s%s len %d/%d\n", 2373 urb, 2374 ({ char *s; 2375 switch (urb->dev->speed) { 2376 case USB_SPEED_LOW: 2377 s = "ls"; 2378 break; 2379 case USB_SPEED_FULL: 2380 s = "fs"; 2381 break; 2382 case USB_SPEED_HIGH: 2383 s = "hs"; 2384 break; 2385 case USB_SPEED_SUPER: 2386 s = "ss"; 2387 break; 2388 default: 2389 s = "?"; 2390 break; 2391 } s; }), 2392 ep, ep ? (usb_pipein(urb->pipe) ? "in" : "out") : "", 2393 ({ char *s; \ 2394 switch (usb_pipetype(urb->pipe)) { \ 2395 case PIPE_CONTROL: \ 2396 s = ""; \ 2397 break; \ 2398 case PIPE_BULK: \ 2399 s = "-bulk"; \ 2400 break; \ 2401 case PIPE_INTERRUPT: \ 2402 s = "-int"; \ 2403 break; \ 2404 default: \ 2405 s = "-iso"; \ 2406 break; \ 2407 } s; }), 2408 urb->actual_length, urb->transfer_buffer_length); 2409 } 2410 2411 static ssize_t urbs_show(struct device *dev, struct device_attribute *attr, 2412 char *buf) 2413 { 2414 struct usb_hcd *hcd = dev_get_drvdata(dev); 2415 struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd); 2416 struct urbp *urbp; 2417 size_t size = 0; 2418 unsigned long flags; 2419 2420 spin_lock_irqsave(&dum_hcd->dum->lock, flags); 2421 list_for_each_entry(urbp, &dum_hcd->urbp_list, urbp_list) { 2422 size_t temp; 2423 2424 temp = show_urb(buf, PAGE_SIZE - size, urbp->urb); 2425 buf += temp; 2426 size += temp; 2427 } 2428 spin_unlock_irqrestore(&dum_hcd->dum->lock, flags); 2429 2430 return size; 2431 } 2432 static DEVICE_ATTR_RO(urbs); 2433 2434 static int dummy_start_ss(struct dummy_hcd *dum_hcd) 2435 { 2436 init_timer(&dum_hcd->timer); 2437 dum_hcd->timer.function = dummy_timer; 2438 dum_hcd->timer.data = (unsigned long)dum_hcd; 2439 dum_hcd->rh_state = DUMMY_RH_RUNNING; 2440 dum_hcd->stream_en_ep = 0; 2441 INIT_LIST_HEAD(&dum_hcd->urbp_list); 2442 dummy_hcd_to_hcd(dum_hcd)->power_budget = POWER_BUDGET; 2443 dummy_hcd_to_hcd(dum_hcd)->state = HC_STATE_RUNNING; 2444 dummy_hcd_to_hcd(dum_hcd)->uses_new_polling = 1; 2445 #ifdef CONFIG_USB_OTG 2446 dummy_hcd_to_hcd(dum_hcd)->self.otg_port = 1; 2447 #endif 2448 return 0; 2449 2450 /* FIXME 'urbs' should be a per-device thing, maybe in usbcore */ 2451 return device_create_file(dummy_dev(dum_hcd), &dev_attr_urbs); 2452 } 2453 2454 static int dummy_start(struct usb_hcd *hcd) 2455 { 2456 struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd); 2457 2458 /* 2459 * MASTER side init ... we emulate a root hub that'll only ever 2460 * talk to one device (the slave side). Also appears in sysfs, 2461 * just like more familiar pci-based HCDs. 2462 */ 2463 if (!usb_hcd_is_primary_hcd(hcd)) 2464 return dummy_start_ss(dum_hcd); 2465 2466 spin_lock_init(&dum_hcd->dum->lock); 2467 init_timer(&dum_hcd->timer); 2468 dum_hcd->timer.function = dummy_timer; 2469 dum_hcd->timer.data = (unsigned long)dum_hcd; 2470 dum_hcd->rh_state = DUMMY_RH_RUNNING; 2471 2472 INIT_LIST_HEAD(&dum_hcd->urbp_list); 2473 2474 hcd->power_budget = POWER_BUDGET; 2475 hcd->state = HC_STATE_RUNNING; 2476 hcd->uses_new_polling = 1; 2477 2478 #ifdef CONFIG_USB_OTG 2479 hcd->self.otg_port = 1; 2480 #endif 2481 2482 /* FIXME 'urbs' should be a per-device thing, maybe in usbcore */ 2483 return device_create_file(dummy_dev(dum_hcd), &dev_attr_urbs); 2484 } 2485 2486 static void dummy_stop(struct usb_hcd *hcd) 2487 { 2488 device_remove_file(dummy_dev(hcd_to_dummy_hcd(hcd)), &dev_attr_urbs); 2489 dev_info(dummy_dev(hcd_to_dummy_hcd(hcd)), "stopped\n"); 2490 } 2491 2492 /*-------------------------------------------------------------------------*/ 2493 2494 static int dummy_h_get_frame(struct usb_hcd *hcd) 2495 { 2496 return dummy_g_get_frame(NULL); 2497 } 2498 2499 static int dummy_setup(struct usb_hcd *hcd) 2500 { 2501 struct dummy *dum; 2502 2503 dum = *((void **)dev_get_platdata(hcd->self.controller)); 2504 hcd->self.sg_tablesize = ~0; 2505 if (usb_hcd_is_primary_hcd(hcd)) { 2506 dum->hs_hcd = hcd_to_dummy_hcd(hcd); 2507 dum->hs_hcd->dum = dum; 2508 /* 2509 * Mark the first roothub as being USB 2.0. 2510 * The USB 3.0 roothub will be registered later by 2511 * dummy_hcd_probe() 2512 */ 2513 hcd->speed = HCD_USB2; 2514 hcd->self.root_hub->speed = USB_SPEED_HIGH; 2515 } else { 2516 dum->ss_hcd = hcd_to_dummy_hcd(hcd); 2517 dum->ss_hcd->dum = dum; 2518 hcd->speed = HCD_USB3; 2519 hcd->self.root_hub->speed = USB_SPEED_SUPER; 2520 } 2521 return 0; 2522 } 2523 2524 /* Change a group of bulk endpoints to support multiple stream IDs */ 2525 static int dummy_alloc_streams(struct usb_hcd *hcd, struct usb_device *udev, 2526 struct usb_host_endpoint **eps, unsigned int num_eps, 2527 unsigned int num_streams, gfp_t mem_flags) 2528 { 2529 struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd); 2530 unsigned long flags; 2531 int max_stream; 2532 int ret_streams = num_streams; 2533 unsigned int index; 2534 unsigned int i; 2535 2536 if (!num_eps) 2537 return -EINVAL; 2538 2539 spin_lock_irqsave(&dum_hcd->dum->lock, flags); 2540 for (i = 0; i < num_eps; i++) { 2541 index = dummy_get_ep_idx(&eps[i]->desc); 2542 if ((1 << index) & dum_hcd->stream_en_ep) { 2543 ret_streams = -EINVAL; 2544 goto out; 2545 } 2546 max_stream = usb_ss_max_streams(&eps[i]->ss_ep_comp); 2547 if (!max_stream) { 2548 ret_streams = -EINVAL; 2549 goto out; 2550 } 2551 if (max_stream < ret_streams) { 2552 dev_dbg(dummy_dev(dum_hcd), "Ep 0x%x only supports %u " 2553 "stream IDs.\n", 2554 eps[i]->desc.bEndpointAddress, 2555 max_stream); 2556 ret_streams = max_stream; 2557 } 2558 } 2559 2560 for (i = 0; i < num_eps; i++) { 2561 index = dummy_get_ep_idx(&eps[i]->desc); 2562 dum_hcd->stream_en_ep |= 1 << index; 2563 set_max_streams_for_pipe(dum_hcd, 2564 usb_endpoint_num(&eps[i]->desc), ret_streams); 2565 } 2566 out: 2567 spin_unlock_irqrestore(&dum_hcd->dum->lock, flags); 2568 return ret_streams; 2569 } 2570 2571 /* Reverts a group of bulk endpoints back to not using stream IDs. */ 2572 static int dummy_free_streams(struct usb_hcd *hcd, struct usb_device *udev, 2573 struct usb_host_endpoint **eps, unsigned int num_eps, 2574 gfp_t mem_flags) 2575 { 2576 struct dummy_hcd *dum_hcd = hcd_to_dummy_hcd(hcd); 2577 unsigned long flags; 2578 int ret; 2579 unsigned int index; 2580 unsigned int i; 2581 2582 spin_lock_irqsave(&dum_hcd->dum->lock, flags); 2583 for (i = 0; i < num_eps; i++) { 2584 index = dummy_get_ep_idx(&eps[i]->desc); 2585 if (!((1 << index) & dum_hcd->stream_en_ep)) { 2586 ret = -EINVAL; 2587 goto out; 2588 } 2589 } 2590 2591 for (i = 0; i < num_eps; i++) { 2592 index = dummy_get_ep_idx(&eps[i]->desc); 2593 dum_hcd->stream_en_ep &= ~(1 << index); 2594 set_max_streams_for_pipe(dum_hcd, 2595 usb_endpoint_num(&eps[i]->desc), 0); 2596 } 2597 ret = 0; 2598 out: 2599 spin_unlock_irqrestore(&dum_hcd->dum->lock, flags); 2600 return ret; 2601 } 2602 2603 static struct hc_driver dummy_hcd = { 2604 .description = (char *) driver_name, 2605 .product_desc = "Dummy host controller", 2606 .hcd_priv_size = sizeof(struct dummy_hcd), 2607 2608 .reset = dummy_setup, 2609 .start = dummy_start, 2610 .stop = dummy_stop, 2611 2612 .urb_enqueue = dummy_urb_enqueue, 2613 .urb_dequeue = dummy_urb_dequeue, 2614 2615 .get_frame_number = dummy_h_get_frame, 2616 2617 .hub_status_data = dummy_hub_status, 2618 .hub_control = dummy_hub_control, 2619 .bus_suspend = dummy_bus_suspend, 2620 .bus_resume = dummy_bus_resume, 2621 2622 .alloc_streams = dummy_alloc_streams, 2623 .free_streams = dummy_free_streams, 2624 }; 2625 2626 static int dummy_hcd_probe(struct platform_device *pdev) 2627 { 2628 struct dummy *dum; 2629 struct usb_hcd *hs_hcd; 2630 struct usb_hcd *ss_hcd; 2631 int retval; 2632 2633 dev_info(&pdev->dev, "%s, driver " DRIVER_VERSION "\n", driver_desc); 2634 dum = *((void **)dev_get_platdata(&pdev->dev)); 2635 2636 if (mod_data.is_super_speed) 2637 dummy_hcd.flags = HCD_USB3 | HCD_SHARED; 2638 else if (mod_data.is_high_speed) 2639 dummy_hcd.flags = HCD_USB2; 2640 else 2641 dummy_hcd.flags = HCD_USB11; 2642 hs_hcd = usb_create_hcd(&dummy_hcd, &pdev->dev, dev_name(&pdev->dev)); 2643 if (!hs_hcd) 2644 return -ENOMEM; 2645 hs_hcd->has_tt = 1; 2646 2647 retval = usb_add_hcd(hs_hcd, 0, 0); 2648 if (retval) 2649 goto put_usb2_hcd; 2650 2651 if (mod_data.is_super_speed) { 2652 ss_hcd = usb_create_shared_hcd(&dummy_hcd, &pdev->dev, 2653 dev_name(&pdev->dev), hs_hcd); 2654 if (!ss_hcd) { 2655 retval = -ENOMEM; 2656 goto dealloc_usb2_hcd; 2657 } 2658 2659 retval = usb_add_hcd(ss_hcd, 0, 0); 2660 if (retval) 2661 goto put_usb3_hcd; 2662 } 2663 return 0; 2664 2665 put_usb3_hcd: 2666 usb_put_hcd(ss_hcd); 2667 dealloc_usb2_hcd: 2668 usb_remove_hcd(hs_hcd); 2669 put_usb2_hcd: 2670 usb_put_hcd(hs_hcd); 2671 dum->hs_hcd = dum->ss_hcd = NULL; 2672 return retval; 2673 } 2674 2675 static int dummy_hcd_remove(struct platform_device *pdev) 2676 { 2677 struct dummy *dum; 2678 2679 dum = hcd_to_dummy_hcd(platform_get_drvdata(pdev))->dum; 2680 2681 if (dum->ss_hcd) { 2682 usb_remove_hcd(dummy_hcd_to_hcd(dum->ss_hcd)); 2683 usb_put_hcd(dummy_hcd_to_hcd(dum->ss_hcd)); 2684 } 2685 2686 usb_remove_hcd(dummy_hcd_to_hcd(dum->hs_hcd)); 2687 usb_put_hcd(dummy_hcd_to_hcd(dum->hs_hcd)); 2688 2689 dum->hs_hcd = NULL; 2690 dum->ss_hcd = NULL; 2691 2692 return 0; 2693 } 2694 2695 static int dummy_hcd_suspend(struct platform_device *pdev, pm_message_t state) 2696 { 2697 struct usb_hcd *hcd; 2698 struct dummy_hcd *dum_hcd; 2699 int rc = 0; 2700 2701 dev_dbg(&pdev->dev, "%s\n", __func__); 2702 2703 hcd = platform_get_drvdata(pdev); 2704 dum_hcd = hcd_to_dummy_hcd(hcd); 2705 if (dum_hcd->rh_state == DUMMY_RH_RUNNING) { 2706 dev_warn(&pdev->dev, "Root hub isn't suspended!\n"); 2707 rc = -EBUSY; 2708 } else 2709 clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags); 2710 return rc; 2711 } 2712 2713 static int dummy_hcd_resume(struct platform_device *pdev) 2714 { 2715 struct usb_hcd *hcd; 2716 2717 dev_dbg(&pdev->dev, "%s\n", __func__); 2718 2719 hcd = platform_get_drvdata(pdev); 2720 set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags); 2721 usb_hcd_poll_rh_status(hcd); 2722 return 0; 2723 } 2724 2725 static struct platform_driver dummy_hcd_driver = { 2726 .probe = dummy_hcd_probe, 2727 .remove = dummy_hcd_remove, 2728 .suspend = dummy_hcd_suspend, 2729 .resume = dummy_hcd_resume, 2730 .driver = { 2731 .name = (char *) driver_name, 2732 }, 2733 }; 2734 2735 /*-------------------------------------------------------------------------*/ 2736 #define MAX_NUM_UDC 2 2737 static struct platform_device *the_udc_pdev[MAX_NUM_UDC]; 2738 static struct platform_device *the_hcd_pdev[MAX_NUM_UDC]; 2739 2740 static int __init init(void) 2741 { 2742 int retval = -ENOMEM; 2743 int i; 2744 struct dummy *dum[MAX_NUM_UDC]; 2745 2746 if (usb_disabled()) 2747 return -ENODEV; 2748 2749 if (!mod_data.is_high_speed && mod_data.is_super_speed) 2750 return -EINVAL; 2751 2752 if (mod_data.num < 1 || mod_data.num > MAX_NUM_UDC) { 2753 pr_err("Number of emulated UDC must be in range of 1...%d\n", 2754 MAX_NUM_UDC); 2755 return -EINVAL; 2756 } 2757 2758 for (i = 0; i < mod_data.num; i++) { 2759 the_hcd_pdev[i] = platform_device_alloc(driver_name, i); 2760 if (!the_hcd_pdev[i]) { 2761 i--; 2762 while (i >= 0) 2763 platform_device_put(the_hcd_pdev[i--]); 2764 return retval; 2765 } 2766 } 2767 for (i = 0; i < mod_data.num; i++) { 2768 the_udc_pdev[i] = platform_device_alloc(gadget_name, i); 2769 if (!the_udc_pdev[i]) { 2770 i--; 2771 while (i >= 0) 2772 platform_device_put(the_udc_pdev[i--]); 2773 goto err_alloc_udc; 2774 } 2775 } 2776 for (i = 0; i < mod_data.num; i++) { 2777 dum[i] = kzalloc(sizeof(struct dummy), GFP_KERNEL); 2778 if (!dum[i]) { 2779 retval = -ENOMEM; 2780 goto err_add_pdata; 2781 } 2782 retval = platform_device_add_data(the_hcd_pdev[i], &dum[i], 2783 sizeof(void *)); 2784 if (retval) 2785 goto err_add_pdata; 2786 retval = platform_device_add_data(the_udc_pdev[i], &dum[i], 2787 sizeof(void *)); 2788 if (retval) 2789 goto err_add_pdata; 2790 } 2791 2792 retval = platform_driver_register(&dummy_hcd_driver); 2793 if (retval < 0) 2794 goto err_add_pdata; 2795 retval = platform_driver_register(&dummy_udc_driver); 2796 if (retval < 0) 2797 goto err_register_udc_driver; 2798 2799 for (i = 0; i < mod_data.num; i++) { 2800 retval = platform_device_add(the_hcd_pdev[i]); 2801 if (retval < 0) { 2802 i--; 2803 while (i >= 0) 2804 platform_device_del(the_hcd_pdev[i--]); 2805 goto err_add_hcd; 2806 } 2807 } 2808 for (i = 0; i < mod_data.num; i++) { 2809 if (!dum[i]->hs_hcd || 2810 (!dum[i]->ss_hcd && mod_data.is_super_speed)) { 2811 /* 2812 * The hcd was added successfully but its probe 2813 * function failed for some reason. 2814 */ 2815 retval = -EINVAL; 2816 goto err_add_udc; 2817 } 2818 } 2819 2820 for (i = 0; i < mod_data.num; i++) { 2821 retval = platform_device_add(the_udc_pdev[i]); 2822 if (retval < 0) { 2823 i--; 2824 while (i >= 0) 2825 platform_device_del(the_udc_pdev[i--]); 2826 goto err_add_udc; 2827 } 2828 } 2829 2830 for (i = 0; i < mod_data.num; i++) { 2831 if (!platform_get_drvdata(the_udc_pdev[i])) { 2832 /* 2833 * The udc was added successfully but its probe 2834 * function failed for some reason. 2835 */ 2836 retval = -EINVAL; 2837 goto err_probe_udc; 2838 } 2839 } 2840 return retval; 2841 2842 err_probe_udc: 2843 for (i = 0; i < mod_data.num; i++) 2844 platform_device_del(the_udc_pdev[i]); 2845 err_add_udc: 2846 for (i = 0; i < mod_data.num; i++) 2847 platform_device_del(the_hcd_pdev[i]); 2848 err_add_hcd: 2849 platform_driver_unregister(&dummy_udc_driver); 2850 err_register_udc_driver: 2851 platform_driver_unregister(&dummy_hcd_driver); 2852 err_add_pdata: 2853 for (i = 0; i < mod_data.num; i++) 2854 kfree(dum[i]); 2855 for (i = 0; i < mod_data.num; i++) 2856 platform_device_put(the_udc_pdev[i]); 2857 err_alloc_udc: 2858 for (i = 0; i < mod_data.num; i++) 2859 platform_device_put(the_hcd_pdev[i]); 2860 return retval; 2861 } 2862 module_init(init); 2863 2864 static void __exit cleanup(void) 2865 { 2866 int i; 2867 2868 for (i = 0; i < mod_data.num; i++) { 2869 struct dummy *dum; 2870 2871 dum = *((void **)dev_get_platdata(&the_udc_pdev[i]->dev)); 2872 2873 platform_device_unregister(the_udc_pdev[i]); 2874 platform_device_unregister(the_hcd_pdev[i]); 2875 kfree(dum); 2876 } 2877 platform_driver_unregister(&dummy_udc_driver); 2878 platform_driver_unregister(&dummy_hcd_driver); 2879 } 2880 module_exit(cleanup); 2881