1/* 2 * composite.c - infrastructure for Composite USB Gadgets 3 * 4 * Copyright (C) 2006-2008 David Brownell 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; either version 2 of the License, or 9 * (at your option) any later version. 10 */ 11 12/* #define VERBOSE_DEBUG */ 13 14#include <linux/kallsyms.h> 15#include <linux/kernel.h> 16#include <linux/slab.h> 17#include <linux/module.h> 18#include <linux/device.h> 19#include <linux/utsname.h> 20 21#include <linux/usb/composite.h> 22#include <asm/unaligned.h> 23 24#include "u_os_desc.h" 25 26/** 27 * struct usb_os_string - represents OS String to be reported by a gadget 28 * @bLength: total length of the entire descritor, always 0x12 29 * @bDescriptorType: USB_DT_STRING 30 * @qwSignature: the OS String proper 31 * @bMS_VendorCode: code used by the host for subsequent requests 32 * @bPad: not used, must be zero 33 */ 34struct usb_os_string { 35 __u8 bLength; 36 __u8 bDescriptorType; 37 __u8 qwSignature[OS_STRING_QW_SIGN_LEN]; 38 __u8 bMS_VendorCode; 39 __u8 bPad; 40} __packed; 41 42/* 43 * The code in this file is utility code, used to build a gadget driver 44 * from one or more "function" drivers, one or more "configuration" 45 * objects, and a "usb_composite_driver" by gluing them together along 46 * with the relevant device-wide data. 47 */ 48 49static struct usb_gadget_strings **get_containers_gs( 50 struct usb_gadget_string_container *uc) 51{ 52 return (struct usb_gadget_strings **)uc->stash; 53} 54 55/** 56 * next_ep_desc() - advance to the next EP descriptor 57 * @t: currect pointer within descriptor array 58 * 59 * Return: next EP descriptor or NULL 60 * 61 * Iterate over @t until either EP descriptor found or 62 * NULL (that indicates end of list) encountered 63 */ 64static struct usb_descriptor_header** 65next_ep_desc(struct usb_descriptor_header **t) 66{ 67 for (; *t; t++) { 68 if ((*t)->bDescriptorType == USB_DT_ENDPOINT) 69 return t; 70 } 71 return NULL; 72} 73 74/* 75 * for_each_ep_desc()- iterate over endpoint descriptors in the 76 * descriptors list 77 * @start: pointer within descriptor array. 78 * @ep_desc: endpoint descriptor to use as the loop cursor 79 */ 80#define for_each_ep_desc(start, ep_desc) \ 81 for (ep_desc = next_ep_desc(start); \ 82 ep_desc; ep_desc = next_ep_desc(ep_desc+1)) 83 84/** 85 * config_ep_by_speed() - configures the given endpoint 86 * according to gadget speed. 87 * @g: pointer to the gadget 88 * @f: usb function 89 * @_ep: the endpoint to configure 90 * 91 * Return: error code, 0 on success 92 * 93 * This function chooses the right descriptors for a given 94 * endpoint according to gadget speed and saves it in the 95 * endpoint desc field. If the endpoint already has a descriptor 96 * assigned to it - overwrites it with currently corresponding 97 * descriptor. The endpoint maxpacket field is updated according 98 * to the chosen descriptor. 99 * Note: the supplied function should hold all the descriptors 100 * for supported speeds 101 */ 102int config_ep_by_speed(struct usb_gadget *g, 103 struct usb_function *f, 104 struct usb_ep *_ep) 105{ 106 struct usb_composite_dev *cdev = get_gadget_data(g); 107 struct usb_endpoint_descriptor *chosen_desc = NULL; 108 struct usb_descriptor_header **speed_desc = NULL; 109 110 struct usb_ss_ep_comp_descriptor *comp_desc = NULL; 111 int want_comp_desc = 0; 112 113 struct usb_descriptor_header **d_spd; /* cursor for speed desc */ 114 115 if (!g || !f || !_ep) 116 return -EIO; 117 118 /* select desired speed */ 119 switch (g->speed) { 120 case USB_SPEED_SUPER: 121 if (gadget_is_superspeed(g)) { 122 speed_desc = f->ss_descriptors; 123 want_comp_desc = 1; 124 break; 125 } 126 /* else: Fall trough */ 127 case USB_SPEED_HIGH: 128 if (gadget_is_dualspeed(g)) { 129 speed_desc = f->hs_descriptors; 130 break; 131 } 132 /* else: fall through */ 133 default: 134 speed_desc = f->fs_descriptors; 135 } 136 /* find descriptors */ 137 for_each_ep_desc(speed_desc, d_spd) { 138 chosen_desc = (struct usb_endpoint_descriptor *)*d_spd; 139 if (chosen_desc->bEndpointAddress == _ep->address) 140 goto ep_found; 141 } 142 return -EIO; 143 144ep_found: 145 /* commit results */ 146 _ep->maxpacket = usb_endpoint_maxp(chosen_desc); 147 _ep->desc = chosen_desc; 148 _ep->comp_desc = NULL; 149 _ep->maxburst = 0; 150 _ep->mult = 0; 151 if (!want_comp_desc) 152 return 0; 153 154 /* 155 * Companion descriptor should follow EP descriptor 156 * USB 3.0 spec, #9.6.7 157 */ 158 comp_desc = (struct usb_ss_ep_comp_descriptor *)*(++d_spd); 159 if (!comp_desc || 160 (comp_desc->bDescriptorType != USB_DT_SS_ENDPOINT_COMP)) 161 return -EIO; 162 _ep->comp_desc = comp_desc; 163 if (g->speed == USB_SPEED_SUPER) { 164 switch (usb_endpoint_type(_ep->desc)) { 165 case USB_ENDPOINT_XFER_ISOC: 166 /* mult: bits 1:0 of bmAttributes */ 167 _ep->mult = comp_desc->bmAttributes & 0x3; 168 case USB_ENDPOINT_XFER_BULK: 169 case USB_ENDPOINT_XFER_INT: 170 _ep->maxburst = comp_desc->bMaxBurst + 1; 171 break; 172 default: 173 if (comp_desc->bMaxBurst != 0) 174 ERROR(cdev, "ep0 bMaxBurst must be 0\n"); 175 _ep->maxburst = 1; 176 break; 177 } 178 } 179 return 0; 180} 181EXPORT_SYMBOL_GPL(config_ep_by_speed); 182 183/** 184 * usb_add_function() - add a function to a configuration 185 * @config: the configuration 186 * @function: the function being added 187 * Context: single threaded during gadget setup 188 * 189 * After initialization, each configuration must have one or more 190 * functions added to it. Adding a function involves calling its @bind() 191 * method to allocate resources such as interface and string identifiers 192 * and endpoints. 193 * 194 * This function returns the value of the function's bind(), which is 195 * zero for success else a negative errno value. 196 */ 197int usb_add_function(struct usb_configuration *config, 198 struct usb_function *function) 199{ 200 int value = -EINVAL; 201 202 DBG(config->cdev, "adding '%s'/%p to config '%s'/%p\n", 203 function->name, function, 204 config->label, config); 205 206 if (!function->set_alt || !function->disable) 207 goto done; 208 209 function->config = config; 210 list_add_tail(&function->list, &config->functions); 211 212 /* REVISIT *require* function->bind? */ 213 if (function->bind) { 214 value = function->bind(config, function); 215 if (value < 0) { 216 list_del(&function->list); 217 function->config = NULL; 218 } 219 } else 220 value = 0; 221 222 /* We allow configurations that don't work at both speeds. 223 * If we run into a lowspeed Linux system, treat it the same 224 * as full speed ... it's the function drivers that will need 225 * to avoid bulk and ISO transfers. 226 */ 227 if (!config->fullspeed && function->fs_descriptors) 228 config->fullspeed = true; 229 if (!config->highspeed && function->hs_descriptors) 230 config->highspeed = true; 231 if (!config->superspeed && function->ss_descriptors) 232 config->superspeed = true; 233 234done: 235 if (value) 236 DBG(config->cdev, "adding '%s'/%p --> %d\n", 237 function->name, function, value); 238 return value; 239} 240EXPORT_SYMBOL_GPL(usb_add_function); 241 242void usb_remove_function(struct usb_configuration *c, struct usb_function *f) 243{ 244 if (f->disable) 245 f->disable(f); 246 247 bitmap_zero(f->endpoints, 32); 248 list_del(&f->list); 249 if (f->unbind) 250 f->unbind(c, f); 251} 252EXPORT_SYMBOL_GPL(usb_remove_function); 253 254/** 255 * usb_function_deactivate - prevent function and gadget enumeration 256 * @function: the function that isn't yet ready to respond 257 * 258 * Blocks response of the gadget driver to host enumeration by 259 * preventing the data line pullup from being activated. This is 260 * normally called during @bind() processing to change from the 261 * initial "ready to respond" state, or when a required resource 262 * becomes available. 263 * 264 * For example, drivers that serve as a passthrough to a userspace 265 * daemon can block enumeration unless that daemon (such as an OBEX, 266 * MTP, or print server) is ready to handle host requests. 267 * 268 * Not all systems support software control of their USB peripheral 269 * data pullups. 270 * 271 * Returns zero on success, else negative errno. 272 */ 273int usb_function_deactivate(struct usb_function *function) 274{ 275 struct usb_composite_dev *cdev = function->config->cdev; 276 unsigned long flags; 277 int status = 0; 278 279 spin_lock_irqsave(&cdev->lock, flags); 280 281 if (cdev->deactivations == 0) 282 status = usb_gadget_disconnect(cdev->gadget); 283 if (status == 0) 284 cdev->deactivations++; 285 286 spin_unlock_irqrestore(&cdev->lock, flags); 287 return status; 288} 289EXPORT_SYMBOL_GPL(usb_function_deactivate); 290 291/** 292 * usb_function_activate - allow function and gadget enumeration 293 * @function: function on which usb_function_activate() was called 294 * 295 * Reverses effect of usb_function_deactivate(). If no more functions 296 * are delaying their activation, the gadget driver will respond to 297 * host enumeration procedures. 298 * 299 * Returns zero on success, else negative errno. 300 */ 301int usb_function_activate(struct usb_function *function) 302{ 303 struct usb_composite_dev *cdev = function->config->cdev; 304 unsigned long flags; 305 int status = 0; 306 307 spin_lock_irqsave(&cdev->lock, flags); 308 309 if (WARN_ON(cdev->deactivations == 0)) 310 status = -EINVAL; 311 else { 312 cdev->deactivations--; 313 if (cdev->deactivations == 0) 314 status = usb_gadget_connect(cdev->gadget); 315 } 316 317 spin_unlock_irqrestore(&cdev->lock, flags); 318 return status; 319} 320EXPORT_SYMBOL_GPL(usb_function_activate); 321 322/** 323 * usb_interface_id() - allocate an unused interface ID 324 * @config: configuration associated with the interface 325 * @function: function handling the interface 326 * Context: single threaded during gadget setup 327 * 328 * usb_interface_id() is called from usb_function.bind() callbacks to 329 * allocate new interface IDs. The function driver will then store that 330 * ID in interface, association, CDC union, and other descriptors. It 331 * will also handle any control requests targeted at that interface, 332 * particularly changing its altsetting via set_alt(). There may 333 * also be class-specific or vendor-specific requests to handle. 334 * 335 * All interface identifier should be allocated using this routine, to 336 * ensure that for example different functions don't wrongly assign 337 * different meanings to the same identifier. Note that since interface 338 * identifiers are configuration-specific, functions used in more than 339 * one configuration (or more than once in a given configuration) need 340 * multiple versions of the relevant descriptors. 341 * 342 * Returns the interface ID which was allocated; or -ENODEV if no 343 * more interface IDs can be allocated. 344 */ 345int usb_interface_id(struct usb_configuration *config, 346 struct usb_function *function) 347{ 348 unsigned id = config->next_interface_id; 349 350 if (id < MAX_CONFIG_INTERFACES) { 351 config->interface[id] = function; 352 config->next_interface_id = id + 1; 353 return id; 354 } 355 return -ENODEV; 356} 357EXPORT_SYMBOL_GPL(usb_interface_id); 358 359static u8 encode_bMaxPower(enum usb_device_speed speed, 360 struct usb_configuration *c) 361{ 362 unsigned val; 363 364 if (c->MaxPower) 365 val = c->MaxPower; 366 else 367 val = CONFIG_USB_GADGET_VBUS_DRAW; 368 if (!val) 369 return 0; 370 switch (speed) { 371 case USB_SPEED_SUPER: 372 return DIV_ROUND_UP(val, 8); 373 default: 374 return DIV_ROUND_UP(val, 2); 375 } 376} 377 378static int config_buf(struct usb_configuration *config, 379 enum usb_device_speed speed, void *buf, u8 type) 380{ 381 struct usb_config_descriptor *c = buf; 382 void *next = buf + USB_DT_CONFIG_SIZE; 383 int len; 384 struct usb_function *f; 385 int status; 386 387 len = USB_COMP_EP0_BUFSIZ - USB_DT_CONFIG_SIZE; 388 /* write the config descriptor */ 389 c = buf; 390 c->bLength = USB_DT_CONFIG_SIZE; 391 c->bDescriptorType = type; 392 /* wTotalLength is written later */ 393 c->bNumInterfaces = config->next_interface_id; 394 c->bConfigurationValue = config->bConfigurationValue; 395 c->iConfiguration = config->iConfiguration; 396 c->bmAttributes = USB_CONFIG_ATT_ONE | config->bmAttributes; 397 c->bMaxPower = encode_bMaxPower(speed, config); 398 399 /* There may be e.g. OTG descriptors */ 400 if (config->descriptors) { 401 status = usb_descriptor_fillbuf(next, len, 402 config->descriptors); 403 if (status < 0) 404 return status; 405 len -= status; 406 next += status; 407 } 408 409 /* add each function's descriptors */ 410 list_for_each_entry(f, &config->functions, list) { 411 struct usb_descriptor_header **descriptors; 412 413 switch (speed) { 414 case USB_SPEED_SUPER: 415 descriptors = f->ss_descriptors; 416 break; 417 case USB_SPEED_HIGH: 418 descriptors = f->hs_descriptors; 419 break; 420 default: 421 descriptors = f->fs_descriptors; 422 } 423 424 if (!descriptors) 425 continue; 426 status = usb_descriptor_fillbuf(next, len, 427 (const struct usb_descriptor_header **) descriptors); 428 if (status < 0) 429 return status; 430 len -= status; 431 next += status; 432 } 433 434 len = next - buf; 435 c->wTotalLength = cpu_to_le16(len); 436 return len; 437} 438 439static int config_desc(struct usb_composite_dev *cdev, unsigned w_value) 440{ 441 struct usb_gadget *gadget = cdev->gadget; 442 struct usb_configuration *c; 443 struct list_head *pos; 444 u8 type = w_value >> 8; 445 enum usb_device_speed speed = USB_SPEED_UNKNOWN; 446 447 if (gadget->speed == USB_SPEED_SUPER) 448 speed = gadget->speed; 449 else if (gadget_is_dualspeed(gadget)) { 450 int hs = 0; 451 if (gadget->speed == USB_SPEED_HIGH) 452 hs = 1; 453 if (type == USB_DT_OTHER_SPEED_CONFIG) 454 hs = !hs; 455 if (hs) 456 speed = USB_SPEED_HIGH; 457 458 } 459 460 /* This is a lookup by config *INDEX* */ 461 w_value &= 0xff; 462 463 pos = &cdev->configs; 464 c = cdev->os_desc_config; 465 if (c) 466 goto check_config; 467 468 while ((pos = pos->next) != &cdev->configs) { 469 c = list_entry(pos, typeof(*c), list); 470 471 /* skip OS Descriptors config which is handled separately */ 472 if (c == cdev->os_desc_config) 473 continue; 474 475check_config: 476 /* ignore configs that won't work at this speed */ 477 switch (speed) { 478 case USB_SPEED_SUPER: 479 if (!c->superspeed) 480 continue; 481 break; 482 case USB_SPEED_HIGH: 483 if (!c->highspeed) 484 continue; 485 break; 486 default: 487 if (!c->fullspeed) 488 continue; 489 } 490 491 if (w_value == 0) 492 return config_buf(c, speed, cdev->req->buf, type); 493 w_value--; 494 } 495 return -EINVAL; 496} 497 498static int count_configs(struct usb_composite_dev *cdev, unsigned type) 499{ 500 struct usb_gadget *gadget = cdev->gadget; 501 struct usb_configuration *c; 502 unsigned count = 0; 503 int hs = 0; 504 int ss = 0; 505 506 if (gadget_is_dualspeed(gadget)) { 507 if (gadget->speed == USB_SPEED_HIGH) 508 hs = 1; 509 if (gadget->speed == USB_SPEED_SUPER) 510 ss = 1; 511 if (type == USB_DT_DEVICE_QUALIFIER) 512 hs = !hs; 513 } 514 list_for_each_entry(c, &cdev->configs, list) { 515 /* ignore configs that won't work at this speed */ 516 if (ss) { 517 if (!c->superspeed) 518 continue; 519 } else if (hs) { 520 if (!c->highspeed) 521 continue; 522 } else { 523 if (!c->fullspeed) 524 continue; 525 } 526 count++; 527 } 528 return count; 529} 530 531/** 532 * bos_desc() - prepares the BOS descriptor. 533 * @cdev: pointer to usb_composite device to generate the bos 534 * descriptor for 535 * 536 * This function generates the BOS (Binary Device Object) 537 * descriptor and its device capabilities descriptors. The BOS 538 * descriptor should be supported by a SuperSpeed device. 539 */ 540static int bos_desc(struct usb_composite_dev *cdev) 541{ 542 struct usb_ext_cap_descriptor *usb_ext; 543 struct usb_ss_cap_descriptor *ss_cap; 544 struct usb_dcd_config_params dcd_config_params; 545 struct usb_bos_descriptor *bos = cdev->req->buf; 546 547 bos->bLength = USB_DT_BOS_SIZE; 548 bos->bDescriptorType = USB_DT_BOS; 549 550 bos->wTotalLength = cpu_to_le16(USB_DT_BOS_SIZE); 551 bos->bNumDeviceCaps = 0; 552 553 /* 554 * A SuperSpeed device shall include the USB2.0 extension descriptor 555 * and shall support LPM when operating in USB2.0 HS mode. 556 */ 557 usb_ext = cdev->req->buf + le16_to_cpu(bos->wTotalLength); 558 bos->bNumDeviceCaps++; 559 le16_add_cpu(&bos->wTotalLength, USB_DT_USB_EXT_CAP_SIZE); 560 usb_ext->bLength = USB_DT_USB_EXT_CAP_SIZE; 561 usb_ext->bDescriptorType = USB_DT_DEVICE_CAPABILITY; 562 usb_ext->bDevCapabilityType = USB_CAP_TYPE_EXT; 563 usb_ext->bmAttributes = cpu_to_le32(USB_LPM_SUPPORT | USB_BESL_SUPPORT); 564 565 /* 566 * The Superspeed USB Capability descriptor shall be implemented by all 567 * SuperSpeed devices. 568 */ 569 ss_cap = cdev->req->buf + le16_to_cpu(bos->wTotalLength); 570 bos->bNumDeviceCaps++; 571 le16_add_cpu(&bos->wTotalLength, USB_DT_USB_SS_CAP_SIZE); 572 ss_cap->bLength = USB_DT_USB_SS_CAP_SIZE; 573 ss_cap->bDescriptorType = USB_DT_DEVICE_CAPABILITY; 574 ss_cap->bDevCapabilityType = USB_SS_CAP_TYPE; 575 ss_cap->bmAttributes = 0; /* LTM is not supported yet */ 576 ss_cap->wSpeedSupported = cpu_to_le16(USB_LOW_SPEED_OPERATION | 577 USB_FULL_SPEED_OPERATION | 578 USB_HIGH_SPEED_OPERATION | 579 USB_5GBPS_OPERATION); 580 ss_cap->bFunctionalitySupport = USB_LOW_SPEED_OPERATION; 581 582 /* Get Controller configuration */ 583 if (cdev->gadget->ops->get_config_params) 584 cdev->gadget->ops->get_config_params(&dcd_config_params); 585 else { 586 dcd_config_params.bU1devExitLat = USB_DEFAULT_U1_DEV_EXIT_LAT; 587 dcd_config_params.bU2DevExitLat = 588 cpu_to_le16(USB_DEFAULT_U2_DEV_EXIT_LAT); 589 } 590 ss_cap->bU1devExitLat = dcd_config_params.bU1devExitLat; 591 ss_cap->bU2DevExitLat = dcd_config_params.bU2DevExitLat; 592 593 return le16_to_cpu(bos->wTotalLength); 594} 595 596static void device_qual(struct usb_composite_dev *cdev) 597{ 598 struct usb_qualifier_descriptor *qual = cdev->req->buf; 599 600 qual->bLength = sizeof(*qual); 601 qual->bDescriptorType = USB_DT_DEVICE_QUALIFIER; 602 /* POLICY: same bcdUSB and device type info at both speeds */ 603 qual->bcdUSB = cdev->desc.bcdUSB; 604 qual->bDeviceClass = cdev->desc.bDeviceClass; 605 qual->bDeviceSubClass = cdev->desc.bDeviceSubClass; 606 qual->bDeviceProtocol = cdev->desc.bDeviceProtocol; 607 /* ASSUME same EP0 fifo size at both speeds */ 608 qual->bMaxPacketSize0 = cdev->gadget->ep0->maxpacket; 609 qual->bNumConfigurations = count_configs(cdev, USB_DT_DEVICE_QUALIFIER); 610 qual->bRESERVED = 0; 611} 612 613/*-------------------------------------------------------------------------*/ 614 615static void reset_config(struct usb_composite_dev *cdev) 616{ 617 struct usb_function *f; 618 619 DBG(cdev, "reset config\n"); 620 621 list_for_each_entry(f, &cdev->config->functions, list) { 622 if (f->disable) 623 f->disable(f); 624 625 bitmap_zero(f->endpoints, 32); 626 } 627 cdev->config = NULL; 628 cdev->delayed_status = 0; 629} 630 631static int set_config(struct usb_composite_dev *cdev, 632 const struct usb_ctrlrequest *ctrl, unsigned number) 633{ 634 struct usb_gadget *gadget = cdev->gadget; 635 struct usb_configuration *c = NULL; 636 int result = -EINVAL; 637 unsigned power = gadget_is_otg(gadget) ? 8 : 100; 638 int tmp; 639 640 if (number) { 641 list_for_each_entry(c, &cdev->configs, list) { 642 if (c->bConfigurationValue == number) { 643 /* 644 * We disable the FDs of the previous 645 * configuration only if the new configuration 646 * is a valid one 647 */ 648 if (cdev->config) 649 reset_config(cdev); 650 result = 0; 651 break; 652 } 653 } 654 if (result < 0) 655 goto done; 656 } else { /* Zero configuration value - need to reset the config */ 657 if (cdev->config) 658 reset_config(cdev); 659 result = 0; 660 } 661 662 INFO(cdev, "%s config #%d: %s\n", 663 usb_speed_string(gadget->speed), 664 number, c ? c->label : "unconfigured"); 665 666 if (!c) 667 goto done; 668 669 usb_gadget_set_state(gadget, USB_STATE_CONFIGURED); 670 cdev->config = c; 671 672 /* Initialize all interfaces by setting them to altsetting zero. */ 673 for (tmp = 0; tmp < MAX_CONFIG_INTERFACES; tmp++) { 674 struct usb_function *f = c->interface[tmp]; 675 struct usb_descriptor_header **descriptors; 676 677 if (!f) 678 break; 679 680 /* 681 * Record which endpoints are used by the function. This is used 682 * to dispatch control requests targeted at that endpoint to the 683 * function's setup callback instead of the current 684 * configuration's setup callback. 685 */ 686 switch (gadget->speed) { 687 case USB_SPEED_SUPER: 688 descriptors = f->ss_descriptors; 689 break; 690 case USB_SPEED_HIGH: 691 descriptors = f->hs_descriptors; 692 break; 693 default: 694 descriptors = f->fs_descriptors; 695 } 696 697 for (; *descriptors; ++descriptors) { 698 struct usb_endpoint_descriptor *ep; 699 int addr; 700 701 if ((*descriptors)->bDescriptorType != USB_DT_ENDPOINT) 702 continue; 703 704 ep = (struct usb_endpoint_descriptor *)*descriptors; 705 addr = ((ep->bEndpointAddress & 0x80) >> 3) 706 | (ep->bEndpointAddress & 0x0f); 707 set_bit(addr, f->endpoints); 708 } 709 710 result = f->set_alt(f, tmp, 0); 711 if (result < 0) { 712 DBG(cdev, "interface %d (%s/%p) alt 0 --> %d\n", 713 tmp, f->name, f, result); 714 715 reset_config(cdev); 716 goto done; 717 } 718 719 if (result == USB_GADGET_DELAYED_STATUS) { 720 DBG(cdev, 721 "%s: interface %d (%s) requested delayed status\n", 722 __func__, tmp, f->name); 723 cdev->delayed_status++; 724 DBG(cdev, "delayed_status count %d\n", 725 cdev->delayed_status); 726 } 727 } 728 729 /* when we return, be sure our power usage is valid */ 730 power = c->MaxPower ? c->MaxPower : CONFIG_USB_GADGET_VBUS_DRAW; 731done: 732 usb_gadget_vbus_draw(gadget, power); 733 if (result >= 0 && cdev->delayed_status) 734 result = USB_GADGET_DELAYED_STATUS; 735 return result; 736} 737 738int usb_add_config_only(struct usb_composite_dev *cdev, 739 struct usb_configuration *config) 740{ 741 struct usb_configuration *c; 742 743 if (!config->bConfigurationValue) 744 return -EINVAL; 745 746 /* Prevent duplicate configuration identifiers */ 747 list_for_each_entry(c, &cdev->configs, list) { 748 if (c->bConfigurationValue == config->bConfigurationValue) 749 return -EBUSY; 750 } 751 752 config->cdev = cdev; 753 list_add_tail(&config->list, &cdev->configs); 754 755 INIT_LIST_HEAD(&config->functions); 756 config->next_interface_id = 0; 757 memset(config->interface, 0, sizeof(config->interface)); 758 759 return 0; 760} 761EXPORT_SYMBOL_GPL(usb_add_config_only); 762 763/** 764 * usb_add_config() - add a configuration to a device. 765 * @cdev: wraps the USB gadget 766 * @config: the configuration, with bConfigurationValue assigned 767 * @bind: the configuration's bind function 768 * Context: single threaded during gadget setup 769 * 770 * One of the main tasks of a composite @bind() routine is to 771 * add each of the configurations it supports, using this routine. 772 * 773 * This function returns the value of the configuration's @bind(), which 774 * is zero for success else a negative errno value. Binding configurations 775 * assigns global resources including string IDs, and per-configuration 776 * resources such as interface IDs and endpoints. 777 */ 778int usb_add_config(struct usb_composite_dev *cdev, 779 struct usb_configuration *config, 780 int (*bind)(struct usb_configuration *)) 781{ 782 int status = -EINVAL; 783 784 if (!bind) 785 goto done; 786 787 DBG(cdev, "adding config #%u '%s'/%p\n", 788 config->bConfigurationValue, 789 config->label, config); 790 791 status = usb_add_config_only(cdev, config); 792 if (status) 793 goto done; 794 795 status = bind(config); 796 if (status < 0) { 797 while (!list_empty(&config->functions)) { 798 struct usb_function *f; 799 800 f = list_first_entry(&config->functions, 801 struct usb_function, list); 802 list_del(&f->list); 803 if (f->unbind) { 804 DBG(cdev, "unbind function '%s'/%p\n", 805 f->name, f); 806 f->unbind(config, f); 807 /* may free memory for "f" */ 808 } 809 } 810 list_del(&config->list); 811 config->cdev = NULL; 812 } else { 813 unsigned i; 814 815 DBG(cdev, "cfg %d/%p speeds:%s%s%s\n", 816 config->bConfigurationValue, config, 817 config->superspeed ? " super" : "", 818 config->highspeed ? " high" : "", 819 config->fullspeed 820 ? (gadget_is_dualspeed(cdev->gadget) 821 ? " full" 822 : " full/low") 823 : ""); 824 825 for (i = 0; i < MAX_CONFIG_INTERFACES; i++) { 826 struct usb_function *f = config->interface[i]; 827 828 if (!f) 829 continue; 830 DBG(cdev, " interface %d = %s/%p\n", 831 i, f->name, f); 832 } 833 } 834 835 /* set_alt(), or next bind(), sets up 836 * ep->driver_data as needed. 837 */ 838 usb_ep_autoconfig_reset(cdev->gadget); 839 840done: 841 if (status) 842 DBG(cdev, "added config '%s'/%u --> %d\n", config->label, 843 config->bConfigurationValue, status); 844 return status; 845} 846EXPORT_SYMBOL_GPL(usb_add_config); 847 848static void unbind_config(struct usb_composite_dev *cdev, 849 struct usb_configuration *config) 850{ 851 while (!list_empty(&config->functions)) { 852 struct usb_function *f; 853 854 f = list_first_entry(&config->functions, 855 struct usb_function, list); 856 list_del(&f->list); 857 if (f->unbind) { 858 DBG(cdev, "unbind function '%s'/%p\n", f->name, f); 859 f->unbind(config, f); 860 /* may free memory for "f" */ 861 } 862 } 863 if (config->unbind) { 864 DBG(cdev, "unbind config '%s'/%p\n", config->label, config); 865 config->unbind(config); 866 /* may free memory for "c" */ 867 } 868} 869 870/** 871 * usb_remove_config() - remove a configuration from a device. 872 * @cdev: wraps the USB gadget 873 * @config: the configuration 874 * 875 * Drivers must call usb_gadget_disconnect before calling this function 876 * to disconnect the device from the host and make sure the host will not 877 * try to enumerate the device while we are changing the config list. 878 */ 879void usb_remove_config(struct usb_composite_dev *cdev, 880 struct usb_configuration *config) 881{ 882 unsigned long flags; 883 884 spin_lock_irqsave(&cdev->lock, flags); 885 886 if (cdev->config == config) 887 reset_config(cdev); 888 889 list_del(&config->list); 890 891 spin_unlock_irqrestore(&cdev->lock, flags); 892 893 unbind_config(cdev, config); 894} 895 896/*-------------------------------------------------------------------------*/ 897 898/* We support strings in multiple languages ... string descriptor zero 899 * says which languages are supported. The typical case will be that 900 * only one language (probably English) is used, with I18N handled on 901 * the host side. 902 */ 903 904static void collect_langs(struct usb_gadget_strings **sp, __le16 *buf) 905{ 906 const struct usb_gadget_strings *s; 907 __le16 language; 908 __le16 *tmp; 909 910 while (*sp) { 911 s = *sp; 912 language = cpu_to_le16(s->language); 913 for (tmp = buf; *tmp && tmp < &buf[126]; tmp++) { 914 if (*tmp == language) 915 goto repeat; 916 } 917 *tmp++ = language; 918repeat: 919 sp++; 920 } 921} 922 923static int lookup_string( 924 struct usb_gadget_strings **sp, 925 void *buf, 926 u16 language, 927 int id 928) 929{ 930 struct usb_gadget_strings *s; 931 int value; 932 933 while (*sp) { 934 s = *sp++; 935 if (s->language != language) 936 continue; 937 value = usb_gadget_get_string(s, id, buf); 938 if (value > 0) 939 return value; 940 } 941 return -EINVAL; 942} 943 944static int get_string(struct usb_composite_dev *cdev, 945 void *buf, u16 language, int id) 946{ 947 struct usb_composite_driver *composite = cdev->driver; 948 struct usb_gadget_string_container *uc; 949 struct usb_configuration *c; 950 struct usb_function *f; 951 int len; 952 953 /* Yes, not only is USB's I18N support probably more than most 954 * folk will ever care about ... also, it's all supported here. 955 * (Except for UTF8 support for Unicode's "Astral Planes".) 956 */ 957 958 /* 0 == report all available language codes */ 959 if (id == 0) { 960 struct usb_string_descriptor *s = buf; 961 struct usb_gadget_strings **sp; 962 963 memset(s, 0, 256); 964 s->bDescriptorType = USB_DT_STRING; 965 966 sp = composite->strings; 967 if (sp) 968 collect_langs(sp, s->wData); 969 970 list_for_each_entry(c, &cdev->configs, list) { 971 sp = c->strings; 972 if (sp) 973 collect_langs(sp, s->wData); 974 975 list_for_each_entry(f, &c->functions, list) { 976 sp = f->strings; 977 if (sp) 978 collect_langs(sp, s->wData); 979 } 980 } 981 list_for_each_entry(uc, &cdev->gstrings, list) { 982 struct usb_gadget_strings **sp; 983 984 sp = get_containers_gs(uc); 985 collect_langs(sp, s->wData); 986 } 987 988 for (len = 0; len <= 126 && s->wData[len]; len++) 989 continue; 990 if (!len) 991 return -EINVAL; 992 993 s->bLength = 2 * (len + 1); 994 return s->bLength; 995 } 996 997 if (cdev->use_os_string && language == 0 && id == OS_STRING_IDX) { 998 struct usb_os_string *b = buf; 999 b->bLength = sizeof(*b); 1000 b->bDescriptorType = USB_DT_STRING; 1001 compiletime_assert( 1002 sizeof(b->qwSignature) == sizeof(cdev->qw_sign), 1003 "qwSignature size must be equal to qw_sign"); 1004 memcpy(&b->qwSignature, cdev->qw_sign, sizeof(b->qwSignature)); 1005 b->bMS_VendorCode = cdev->b_vendor_code; 1006 b->bPad = 0; 1007 return sizeof(*b); 1008 } 1009 1010 list_for_each_entry(uc, &cdev->gstrings, list) { 1011 struct usb_gadget_strings **sp; 1012 1013 sp = get_containers_gs(uc); 1014 len = lookup_string(sp, buf, language, id); 1015 if (len > 0) 1016 return len; 1017 } 1018 1019 /* String IDs are device-scoped, so we look up each string 1020 * table we're told about. These lookups are infrequent; 1021 * simpler-is-better here. 1022 */ 1023 if (composite->strings) { 1024 len = lookup_string(composite->strings, buf, language, id); 1025 if (len > 0) 1026 return len; 1027 } 1028 list_for_each_entry(c, &cdev->configs, list) { 1029 if (c->strings) { 1030 len = lookup_string(c->strings, buf, language, id); 1031 if (len > 0) 1032 return len; 1033 } 1034 list_for_each_entry(f, &c->functions, list) { 1035 if (!f->strings) 1036 continue; 1037 len = lookup_string(f->strings, buf, language, id); 1038 if (len > 0) 1039 return len; 1040 } 1041 } 1042 return -EINVAL; 1043} 1044 1045/** 1046 * usb_string_id() - allocate an unused string ID 1047 * @cdev: the device whose string descriptor IDs are being allocated 1048 * Context: single threaded during gadget setup 1049 * 1050 * @usb_string_id() is called from bind() callbacks to allocate 1051 * string IDs. Drivers for functions, configurations, or gadgets will 1052 * then store that ID in the appropriate descriptors and string table. 1053 * 1054 * All string identifier should be allocated using this, 1055 * @usb_string_ids_tab() or @usb_string_ids_n() routine, to ensure 1056 * that for example different functions don't wrongly assign different 1057 * meanings to the same identifier. 1058 */ 1059int usb_string_id(struct usb_composite_dev *cdev) 1060{ 1061 if (cdev->next_string_id < 254) { 1062 /* string id 0 is reserved by USB spec for list of 1063 * supported languages */ 1064 /* 255 reserved as well? -- mina86 */ 1065 cdev->next_string_id++; 1066 return cdev->next_string_id; 1067 } 1068 return -ENODEV; 1069} 1070EXPORT_SYMBOL_GPL(usb_string_id); 1071 1072/** 1073 * usb_string_ids() - allocate unused string IDs in batch 1074 * @cdev: the device whose string descriptor IDs are being allocated 1075 * @str: an array of usb_string objects to assign numbers to 1076 * Context: single threaded during gadget setup 1077 * 1078 * @usb_string_ids() is called from bind() callbacks to allocate 1079 * string IDs. Drivers for functions, configurations, or gadgets will 1080 * then copy IDs from the string table to the appropriate descriptors 1081 * and string table for other languages. 1082 * 1083 * All string identifier should be allocated using this, 1084 * @usb_string_id() or @usb_string_ids_n() routine, to ensure that for 1085 * example different functions don't wrongly assign different meanings 1086 * to the same identifier. 1087 */ 1088int usb_string_ids_tab(struct usb_composite_dev *cdev, struct usb_string *str) 1089{ 1090 int next = cdev->next_string_id; 1091 1092 for (; str->s; ++str) { 1093 if (unlikely(next >= 254)) 1094 return -ENODEV; 1095 str->id = ++next; 1096 } 1097 1098 cdev->next_string_id = next; 1099 1100 return 0; 1101} 1102EXPORT_SYMBOL_GPL(usb_string_ids_tab); 1103 1104static struct usb_gadget_string_container *copy_gadget_strings( 1105 struct usb_gadget_strings **sp, unsigned n_gstrings, 1106 unsigned n_strings) 1107{ 1108 struct usb_gadget_string_container *uc; 1109 struct usb_gadget_strings **gs_array; 1110 struct usb_gadget_strings *gs; 1111 struct usb_string *s; 1112 unsigned mem; 1113 unsigned n_gs; 1114 unsigned n_s; 1115 void *stash; 1116 1117 mem = sizeof(*uc); 1118 mem += sizeof(void *) * (n_gstrings + 1); 1119 mem += sizeof(struct usb_gadget_strings) * n_gstrings; 1120 mem += sizeof(struct usb_string) * (n_strings + 1) * (n_gstrings); 1121 uc = kmalloc(mem, GFP_KERNEL); 1122 if (!uc) 1123 return ERR_PTR(-ENOMEM); 1124 gs_array = get_containers_gs(uc); 1125 stash = uc->stash; 1126 stash += sizeof(void *) * (n_gstrings + 1); 1127 for (n_gs = 0; n_gs < n_gstrings; n_gs++) { 1128 struct usb_string *org_s; 1129 1130 gs_array[n_gs] = stash; 1131 gs = gs_array[n_gs]; 1132 stash += sizeof(struct usb_gadget_strings); 1133 gs->language = sp[n_gs]->language; 1134 gs->strings = stash; 1135 org_s = sp[n_gs]->strings; 1136 1137 for (n_s = 0; n_s < n_strings; n_s++) { 1138 s = stash; 1139 stash += sizeof(struct usb_string); 1140 if (org_s->s) 1141 s->s = org_s->s; 1142 else 1143 s->s = ""; 1144 org_s++; 1145 } 1146 s = stash; 1147 s->s = NULL; 1148 stash += sizeof(struct usb_string); 1149 1150 } 1151 gs_array[n_gs] = NULL; 1152 return uc; 1153} 1154 1155/** 1156 * usb_gstrings_attach() - attach gadget strings to a cdev and assign ids 1157 * @cdev: the device whose string descriptor IDs are being allocated 1158 * and attached. 1159 * @sp: an array of usb_gadget_strings to attach. 1160 * @n_strings: number of entries in each usb_strings array (sp[]->strings) 1161 * 1162 * This function will create a deep copy of usb_gadget_strings and usb_string 1163 * and attach it to the cdev. The actual string (usb_string.s) will not be 1164 * copied but only a referenced will be made. The struct usb_gadget_strings 1165 * array may contain multiple languges and should be NULL terminated. 1166 * The ->language pointer of each struct usb_gadget_strings has to contain the 1167 * same amount of entries. 1168 * For instance: sp[0] is en-US, sp[1] is es-ES. It is expected that the first 1169 * usb_string entry of es-ES containts the translation of the first usb_string 1170 * entry of en-US. Therefore both entries become the same id assign. 1171 */ 1172struct usb_string *usb_gstrings_attach(struct usb_composite_dev *cdev, 1173 struct usb_gadget_strings **sp, unsigned n_strings) 1174{ 1175 struct usb_gadget_string_container *uc; 1176 struct usb_gadget_strings **n_gs; 1177 unsigned n_gstrings = 0; 1178 unsigned i; 1179 int ret; 1180 1181 for (i = 0; sp[i]; i++) 1182 n_gstrings++; 1183 1184 if (!n_gstrings) 1185 return ERR_PTR(-EINVAL); 1186 1187 uc = copy_gadget_strings(sp, n_gstrings, n_strings); 1188 if (IS_ERR(uc)) 1189 return ERR_CAST(uc); 1190 1191 n_gs = get_containers_gs(uc); 1192 ret = usb_string_ids_tab(cdev, n_gs[0]->strings); 1193 if (ret) 1194 goto err; 1195 1196 for (i = 1; i < n_gstrings; i++) { 1197 struct usb_string *m_s; 1198 struct usb_string *s; 1199 unsigned n; 1200 1201 m_s = n_gs[0]->strings; 1202 s = n_gs[i]->strings; 1203 for (n = 0; n < n_strings; n++) { 1204 s->id = m_s->id; 1205 s++; 1206 m_s++; 1207 } 1208 } 1209 list_add_tail(&uc->list, &cdev->gstrings); 1210 return n_gs[0]->strings; 1211err: 1212 kfree(uc); 1213 return ERR_PTR(ret); 1214} 1215EXPORT_SYMBOL_GPL(usb_gstrings_attach); 1216 1217/** 1218 * usb_string_ids_n() - allocate unused string IDs in batch 1219 * @c: the device whose string descriptor IDs are being allocated 1220 * @n: number of string IDs to allocate 1221 * Context: single threaded during gadget setup 1222 * 1223 * Returns the first requested ID. This ID and next @n-1 IDs are now 1224 * valid IDs. At least provided that @n is non-zero because if it 1225 * is, returns last requested ID which is now very useful information. 1226 * 1227 * @usb_string_ids_n() is called from bind() callbacks to allocate 1228 * string IDs. Drivers for functions, configurations, or gadgets will 1229 * then store that ID in the appropriate descriptors and string table. 1230 * 1231 * All string identifier should be allocated using this, 1232 * @usb_string_id() or @usb_string_ids_n() routine, to ensure that for 1233 * example different functions don't wrongly assign different meanings 1234 * to the same identifier. 1235 */ 1236int usb_string_ids_n(struct usb_composite_dev *c, unsigned n) 1237{ 1238 unsigned next = c->next_string_id; 1239 if (unlikely(n > 254 || (unsigned)next + n > 254)) 1240 return -ENODEV; 1241 c->next_string_id += n; 1242 return next + 1; 1243} 1244EXPORT_SYMBOL_GPL(usb_string_ids_n); 1245 1246/*-------------------------------------------------------------------------*/ 1247 1248static void composite_setup_complete(struct usb_ep *ep, struct usb_request *req) 1249{ 1250 if (req->status || req->actual != req->length) 1251 DBG((struct usb_composite_dev *) ep->driver_data, 1252 "setup complete --> %d, %d/%d\n", 1253 req->status, req->actual, req->length); 1254} 1255 1256static int count_ext_compat(struct usb_configuration *c) 1257{ 1258 int i, res; 1259 1260 res = 0; 1261 for (i = 0; i < c->next_interface_id; ++i) { 1262 struct usb_function *f; 1263 int j; 1264 1265 f = c->interface[i]; 1266 for (j = 0; j < f->os_desc_n; ++j) { 1267 struct usb_os_desc *d; 1268 1269 if (i != f->os_desc_table[j].if_id) 1270 continue; 1271 d = f->os_desc_table[j].os_desc; 1272 if (d && d->ext_compat_id) 1273 ++res; 1274 } 1275 } 1276 BUG_ON(res > 255); 1277 return res; 1278} 1279 1280static void fill_ext_compat(struct usb_configuration *c, u8 *buf) 1281{ 1282 int i, count; 1283 1284 count = 16; 1285 for (i = 0; i < c->next_interface_id; ++i) { 1286 struct usb_function *f; 1287 int j; 1288 1289 f = c->interface[i]; 1290 for (j = 0; j < f->os_desc_n; ++j) { 1291 struct usb_os_desc *d; 1292 1293 if (i != f->os_desc_table[j].if_id) 1294 continue; 1295 d = f->os_desc_table[j].os_desc; 1296 if (d && d->ext_compat_id) { 1297 *buf++ = i; 1298 *buf++ = 0x01; 1299 memcpy(buf, d->ext_compat_id, 16); 1300 buf += 22; 1301 } else { 1302 ++buf; 1303 *buf = 0x01; 1304 buf += 23; 1305 } 1306 count += 24; 1307 if (count >= 4096) 1308 return; 1309 } 1310 } 1311} 1312 1313static int count_ext_prop(struct usb_configuration *c, int interface) 1314{ 1315 struct usb_function *f; 1316 int j; 1317 1318 f = c->interface[interface]; 1319 for (j = 0; j < f->os_desc_n; ++j) { 1320 struct usb_os_desc *d; 1321 1322 if (interface != f->os_desc_table[j].if_id) 1323 continue; 1324 d = f->os_desc_table[j].os_desc; 1325 if (d && d->ext_compat_id) 1326 return d->ext_prop_count; 1327 } 1328 return 0; 1329} 1330 1331static int len_ext_prop(struct usb_configuration *c, int interface) 1332{ 1333 struct usb_function *f; 1334 struct usb_os_desc *d; 1335 int j, res; 1336 1337 res = 10; /* header length */ 1338 f = c->interface[interface]; 1339 for (j = 0; j < f->os_desc_n; ++j) { 1340 if (interface != f->os_desc_table[j].if_id) 1341 continue; 1342 d = f->os_desc_table[j].os_desc; 1343 if (d) 1344 return min(res + d->ext_prop_len, 4096); 1345 } 1346 return res; 1347} 1348 1349static int fill_ext_prop(struct usb_configuration *c, int interface, u8 *buf) 1350{ 1351 struct usb_function *f; 1352 struct usb_os_desc *d; 1353 struct usb_os_desc_ext_prop *ext_prop; 1354 int j, count, n, ret; 1355 u8 *start = buf; 1356 1357 f = c->interface[interface]; 1358 for (j = 0; j < f->os_desc_n; ++j) { 1359 if (interface != f->os_desc_table[j].if_id) 1360 continue; 1361 d = f->os_desc_table[j].os_desc; 1362 if (d) 1363 list_for_each_entry(ext_prop, &d->ext_prop, entry) { 1364 /* 4kB minus header length */ 1365 n = buf - start; 1366 if (n >= 4086) 1367 return 0; 1368 1369 count = ext_prop->data_len + 1370 ext_prop->name_len + 14; 1371 if (count > 4086 - n) 1372 return -EINVAL; 1373 usb_ext_prop_put_size(buf, count); 1374 usb_ext_prop_put_type(buf, ext_prop->type); 1375 ret = usb_ext_prop_put_name(buf, ext_prop->name, 1376 ext_prop->name_len); 1377 if (ret < 0) 1378 return ret; 1379 switch (ext_prop->type) { 1380 case USB_EXT_PROP_UNICODE: 1381 case USB_EXT_PROP_UNICODE_ENV: 1382 case USB_EXT_PROP_UNICODE_LINK: 1383 usb_ext_prop_put_unicode(buf, ret, 1384 ext_prop->data, 1385 ext_prop->data_len); 1386 break; 1387 case USB_EXT_PROP_BINARY: 1388 usb_ext_prop_put_binary(buf, ret, 1389 ext_prop->data, 1390 ext_prop->data_len); 1391 break; 1392 case USB_EXT_PROP_LE32: 1393 /* not implemented */ 1394 case USB_EXT_PROP_BE32: 1395 /* not implemented */ 1396 default: 1397 return -EINVAL; 1398 } 1399 buf += count; 1400 } 1401 } 1402 1403 return 0; 1404} 1405 1406/* 1407 * The setup() callback implements all the ep0 functionality that's 1408 * not handled lower down, in hardware or the hardware driver(like 1409 * device and endpoint feature flags, and their status). It's all 1410 * housekeeping for the gadget function we're implementing. Most of 1411 * the work is in config and function specific setup. 1412 */ 1413int 1414composite_setup(struct usb_gadget *gadget, const struct usb_ctrlrequest *ctrl) 1415{ 1416 struct usb_composite_dev *cdev = get_gadget_data(gadget); 1417 struct usb_request *req = cdev->req; 1418 int value = -EOPNOTSUPP; 1419 int status = 0; 1420 u16 w_index = le16_to_cpu(ctrl->wIndex); 1421 u8 intf = w_index & 0xFF; 1422 u16 w_value = le16_to_cpu(ctrl->wValue); 1423 u16 w_length = le16_to_cpu(ctrl->wLength); 1424 struct usb_function *f = NULL; 1425 u8 endp; 1426 1427 /* partial re-init of the response message; the function or the 1428 * gadget might need to intercept e.g. a control-OUT completion 1429 * when we delegate to it. 1430 */ 1431 req->zero = 0; 1432 req->complete = composite_setup_complete; 1433 req->length = 0; 1434 gadget->ep0->driver_data = cdev; 1435 1436 switch (ctrl->bRequest) { 1437 1438 /* we handle all standard USB descriptors */ 1439 case USB_REQ_GET_DESCRIPTOR: 1440 if (ctrl->bRequestType != USB_DIR_IN) 1441 goto unknown; 1442 switch (w_value >> 8) { 1443 1444 case USB_DT_DEVICE: 1445 cdev->desc.bNumConfigurations = 1446 count_configs(cdev, USB_DT_DEVICE); 1447 cdev->desc.bMaxPacketSize0 = 1448 cdev->gadget->ep0->maxpacket; 1449 if (gadget_is_superspeed(gadget)) { 1450 if (gadget->speed >= USB_SPEED_SUPER) { 1451 cdev->desc.bcdUSB = cpu_to_le16(0x0300); 1452 cdev->desc.bMaxPacketSize0 = 9; 1453 } else { 1454 cdev->desc.bcdUSB = cpu_to_le16(0x0210); 1455 } 1456 } 1457 1458 value = min(w_length, (u16) sizeof cdev->desc); 1459 memcpy(req->buf, &cdev->desc, value); 1460 break; 1461 case USB_DT_DEVICE_QUALIFIER: 1462 if (!gadget_is_dualspeed(gadget) || 1463 gadget->speed >= USB_SPEED_SUPER) 1464 break; 1465 device_qual(cdev); 1466 value = min_t(int, w_length, 1467 sizeof(struct usb_qualifier_descriptor)); 1468 break; 1469 case USB_DT_OTHER_SPEED_CONFIG: 1470 if (!gadget_is_dualspeed(gadget) || 1471 gadget->speed >= USB_SPEED_SUPER) 1472 break; 1473 /* FALLTHROUGH */ 1474 case USB_DT_CONFIG: 1475 value = config_desc(cdev, w_value); 1476 if (value >= 0) 1477 value = min(w_length, (u16) value); 1478 break; 1479 case USB_DT_STRING: 1480 value = get_string(cdev, req->buf, 1481 w_index, w_value & 0xff); 1482 if (value >= 0) 1483 value = min(w_length, (u16) value); 1484 break; 1485 case USB_DT_BOS: 1486 if (gadget_is_superspeed(gadget)) { 1487 value = bos_desc(cdev); 1488 value = min(w_length, (u16) value); 1489 } 1490 break; 1491 } 1492 break; 1493 1494 /* any number of configs can work */ 1495 case USB_REQ_SET_CONFIGURATION: 1496 if (ctrl->bRequestType != 0) 1497 goto unknown; 1498 if (gadget_is_otg(gadget)) { 1499 if (gadget->a_hnp_support) 1500 DBG(cdev, "HNP available\n"); 1501 else if (gadget->a_alt_hnp_support) 1502 DBG(cdev, "HNP on another port\n"); 1503 else 1504 VDBG(cdev, "HNP inactive\n"); 1505 } 1506 spin_lock(&cdev->lock); 1507 value = set_config(cdev, ctrl, w_value); 1508 spin_unlock(&cdev->lock); 1509 break; 1510 case USB_REQ_GET_CONFIGURATION: 1511 if (ctrl->bRequestType != USB_DIR_IN) 1512 goto unknown; 1513 if (cdev->config) 1514 *(u8 *)req->buf = cdev->config->bConfigurationValue; 1515 else 1516 *(u8 *)req->buf = 0; 1517 value = min(w_length, (u16) 1); 1518 break; 1519 1520 /* function drivers must handle get/set altsetting; if there's 1521 * no get() method, we know only altsetting zero works. 1522 */ 1523 case USB_REQ_SET_INTERFACE: 1524 if (ctrl->bRequestType != USB_RECIP_INTERFACE) 1525 goto unknown; 1526 if (!cdev->config || intf >= MAX_CONFIG_INTERFACES) 1527 break; 1528 f = cdev->config->interface[intf]; 1529 if (!f) 1530 break; 1531 if (w_value && !f->set_alt) 1532 break; 1533 value = f->set_alt(f, w_index, w_value); 1534 if (value == USB_GADGET_DELAYED_STATUS) { 1535 DBG(cdev, 1536 "%s: interface %d (%s) requested delayed status\n", 1537 __func__, intf, f->name); 1538 cdev->delayed_status++; 1539 DBG(cdev, "delayed_status count %d\n", 1540 cdev->delayed_status); 1541 } 1542 break; 1543 case USB_REQ_GET_INTERFACE: 1544 if (ctrl->bRequestType != (USB_DIR_IN|USB_RECIP_INTERFACE)) 1545 goto unknown; 1546 if (!cdev->config || intf >= MAX_CONFIG_INTERFACES) 1547 break; 1548 f = cdev->config->interface[intf]; 1549 if (!f) 1550 break; 1551 /* lots of interfaces only need altsetting zero... */ 1552 value = f->get_alt ? f->get_alt(f, w_index) : 0; 1553 if (value < 0) 1554 break; 1555 *((u8 *)req->buf) = value; 1556 value = min(w_length, (u16) 1); 1557 break; 1558 1559 /* 1560 * USB 3.0 additions: 1561 * Function driver should handle get_status request. If such cb 1562 * wasn't supplied we respond with default value = 0 1563 * Note: function driver should supply such cb only for the first 1564 * interface of the function 1565 */ 1566 case USB_REQ_GET_STATUS: 1567 if (!gadget_is_superspeed(gadget)) 1568 goto unknown; 1569 if (ctrl->bRequestType != (USB_DIR_IN | USB_RECIP_INTERFACE)) 1570 goto unknown; 1571 value = 2; /* This is the length of the get_status reply */ 1572 put_unaligned_le16(0, req->buf); 1573 if (!cdev->config || intf >= MAX_CONFIG_INTERFACES) 1574 break; 1575 f = cdev->config->interface[intf]; 1576 if (!f) 1577 break; 1578 status = f->get_status ? f->get_status(f) : 0; 1579 if (status < 0) 1580 break; 1581 put_unaligned_le16(status & 0x0000ffff, req->buf); 1582 break; 1583 /* 1584 * Function drivers should handle SetFeature/ClearFeature 1585 * (FUNCTION_SUSPEND) request. function_suspend cb should be supplied 1586 * only for the first interface of the function 1587 */ 1588 case USB_REQ_CLEAR_FEATURE: 1589 case USB_REQ_SET_FEATURE: 1590 if (!gadget_is_superspeed(gadget)) 1591 goto unknown; 1592 if (ctrl->bRequestType != (USB_DIR_OUT | USB_RECIP_INTERFACE)) 1593 goto unknown; 1594 switch (w_value) { 1595 case USB_INTRF_FUNC_SUSPEND: 1596 if (!cdev->config || intf >= MAX_CONFIG_INTERFACES) 1597 break; 1598 f = cdev->config->interface[intf]; 1599 if (!f) 1600 break; 1601 value = 0; 1602 if (f->func_suspend) 1603 value = f->func_suspend(f, w_index >> 8); 1604 if (value < 0) { 1605 ERROR(cdev, 1606 "func_suspend() returned error %d\n", 1607 value); 1608 value = 0; 1609 } 1610 break; 1611 } 1612 break; 1613 default: 1614unknown: 1615 /* 1616 * OS descriptors handling 1617 */ 1618 if (cdev->use_os_string && cdev->os_desc_config && 1619 (ctrl->bRequest & USB_TYPE_VENDOR) && 1620 ctrl->bRequest == cdev->b_vendor_code) { 1621 struct usb_request *req; 1622 struct usb_configuration *os_desc_cfg; 1623 u8 *buf; 1624 int interface; 1625 int count = 0; 1626 1627 req = cdev->os_desc_req; 1628 req->complete = composite_setup_complete; 1629 buf = req->buf; 1630 os_desc_cfg = cdev->os_desc_config; 1631 memset(buf, 0, w_length); 1632 buf[5] = 0x01; 1633 switch (ctrl->bRequestType & USB_RECIP_MASK) { 1634 case USB_RECIP_DEVICE: 1635 if (w_index != 0x4 || (w_value >> 8)) 1636 break; 1637 buf[6] = w_index; 1638 if (w_length == 0x10) { 1639 /* Number of ext compat interfaces */ 1640 count = count_ext_compat(os_desc_cfg); 1641 buf[8] = count; 1642 count *= 24; /* 24 B/ext compat desc */ 1643 count += 16; /* header */ 1644 put_unaligned_le32(count, buf); 1645 value = w_length; 1646 } else { 1647 /* "extended compatibility ID"s */ 1648 count = count_ext_compat(os_desc_cfg); 1649 buf[8] = count; 1650 count *= 24; /* 24 B/ext compat desc */ 1651 count += 16; /* header */ 1652 put_unaligned_le32(count, buf); 1653 buf += 16; 1654 fill_ext_compat(os_desc_cfg, buf); 1655 value = w_length; 1656 } 1657 break; 1658 case USB_RECIP_INTERFACE: 1659 if (w_index != 0x5 || (w_value >> 8)) 1660 break; 1661 interface = w_value & 0xFF; 1662 buf[6] = w_index; 1663 if (w_length == 0x0A) { 1664 count = count_ext_prop(os_desc_cfg, 1665 interface); 1666 put_unaligned_le16(count, buf + 8); 1667 count = len_ext_prop(os_desc_cfg, 1668 interface); 1669 put_unaligned_le32(count, buf); 1670 1671 value = w_length; 1672 } else { 1673 count = count_ext_prop(os_desc_cfg, 1674 interface); 1675 put_unaligned_le16(count, buf + 8); 1676 count = len_ext_prop(os_desc_cfg, 1677 interface); 1678 put_unaligned_le32(count, buf); 1679 buf += 10; 1680 value = fill_ext_prop(os_desc_cfg, 1681 interface, buf); 1682 if (value < 0) 1683 return value; 1684 1685 value = w_length; 1686 } 1687 break; 1688 } 1689 req->length = value; 1690 req->zero = value < w_length; 1691 value = usb_ep_queue(gadget->ep0, req, GFP_ATOMIC); 1692 if (value < 0) { 1693 DBG(cdev, "ep_queue --> %d\n", value); 1694 req->status = 0; 1695 composite_setup_complete(gadget->ep0, req); 1696 } 1697 return value; 1698 } 1699 1700 VDBG(cdev, 1701 "non-core control req%02x.%02x v%04x i%04x l%d\n", 1702 ctrl->bRequestType, ctrl->bRequest, 1703 w_value, w_index, w_length); 1704 1705 /* functions always handle their interfaces and endpoints... 1706 * punt other recipients (other, WUSB, ...) to the current 1707 * configuration code. 1708 * 1709 * REVISIT it could make sense to let the composite device 1710 * take such requests too, if that's ever needed: to work 1711 * in config 0, etc. 1712 */ 1713 switch (ctrl->bRequestType & USB_RECIP_MASK) { 1714 case USB_RECIP_INTERFACE: 1715 if (!cdev->config || intf >= MAX_CONFIG_INTERFACES) 1716 break; 1717 f = cdev->config->interface[intf]; 1718 break; 1719 1720 case USB_RECIP_ENDPOINT: 1721 endp = ((w_index & 0x80) >> 3) | (w_index & 0x0f); 1722 list_for_each_entry(f, &cdev->config->functions, list) { 1723 if (test_bit(endp, f->endpoints)) 1724 break; 1725 } 1726 if (&f->list == &cdev->config->functions) 1727 f = NULL; 1728 break; 1729 } 1730 1731 if (f && f->setup) 1732 value = f->setup(f, ctrl); 1733 else { 1734 struct usb_configuration *c; 1735 1736 c = cdev->config; 1737 if (!c) 1738 goto done; 1739 1740 /* try current config's setup */ 1741 if (c->setup) { 1742 value = c->setup(c, ctrl); 1743 goto done; 1744 } 1745 1746 /* try the only function in the current config */ 1747 if (!list_is_singular(&c->functions)) 1748 goto done; 1749 f = list_first_entry(&c->functions, struct usb_function, 1750 list); 1751 if (f->setup) 1752 value = f->setup(f, ctrl); 1753 } 1754 1755 goto done; 1756 } 1757 1758 /* respond with data transfer before status phase? */ 1759 if (value >= 0 && value != USB_GADGET_DELAYED_STATUS) { 1760 req->length = value; 1761 req->zero = value < w_length; 1762 value = usb_ep_queue(gadget->ep0, req, GFP_ATOMIC); 1763 if (value < 0) { 1764 DBG(cdev, "ep_queue --> %d\n", value); 1765 req->status = 0; 1766 composite_setup_complete(gadget->ep0, req); 1767 } 1768 } else if (value == USB_GADGET_DELAYED_STATUS && w_length != 0) { 1769 WARN(cdev, 1770 "%s: Delayed status not supported for w_length != 0", 1771 __func__); 1772 } 1773 1774done: 1775 /* device either stalls (value < 0) or reports success */ 1776 return value; 1777} 1778 1779void composite_disconnect(struct usb_gadget *gadget) 1780{ 1781 struct usb_composite_dev *cdev = get_gadget_data(gadget); 1782 unsigned long flags; 1783 1784 if (cdev == NULL) { 1785 WARN(1, "%s: Calling disconnect on a Gadget that is \ 1786 not connected\n", __func__); 1787 return; 1788 } 1789 1790 /* REVISIT: should we have config and device level 1791 * disconnect callbacks? 1792 */ 1793 spin_lock_irqsave(&cdev->lock, flags); 1794 if (cdev->config) 1795 reset_config(cdev); 1796 if (cdev->driver->disconnect) 1797 cdev->driver->disconnect(cdev); 1798 spin_unlock_irqrestore(&cdev->lock, flags); 1799} 1800 1801/*-------------------------------------------------------------------------*/ 1802 1803static ssize_t suspended_show(struct device *dev, struct device_attribute *attr, 1804 char *buf) 1805{ 1806 struct usb_gadget *gadget = dev_to_usb_gadget(dev); 1807 struct usb_composite_dev *cdev = get_gadget_data(gadget); 1808 1809 return sprintf(buf, "%d\n", cdev->suspended); 1810} 1811static DEVICE_ATTR_RO(suspended); 1812 1813static void __composite_unbind(struct usb_gadget *gadget, bool unbind_driver) 1814{ 1815 struct usb_composite_dev *cdev = get_gadget_data(gadget); 1816 1817 /* composite_disconnect() must already have been called 1818 * by the underlying peripheral controller driver! 1819 * so there's no i/o concurrency that could affect the 1820 * state protected by cdev->lock. 1821 */ 1822 WARN_ON(cdev->config); 1823 1824 while (!list_empty(&cdev->configs)) { 1825 struct usb_configuration *c; 1826 c = list_first_entry(&cdev->configs, 1827 struct usb_configuration, list); 1828 list_del(&c->list); 1829 unbind_config(cdev, c); 1830 } 1831 if (cdev->driver->unbind && unbind_driver) 1832 cdev->driver->unbind(cdev); 1833 1834 composite_dev_cleanup(cdev); 1835 1836 kfree(cdev->def_manufacturer); 1837 kfree(cdev); 1838 set_gadget_data(gadget, NULL); 1839} 1840 1841static void composite_unbind(struct usb_gadget *gadget) 1842{ 1843 __composite_unbind(gadget, true); 1844} 1845 1846static void update_unchanged_dev_desc(struct usb_device_descriptor *new, 1847 const struct usb_device_descriptor *old) 1848{ 1849 __le16 idVendor; 1850 __le16 idProduct; 1851 __le16 bcdDevice; 1852 u8 iSerialNumber; 1853 u8 iManufacturer; 1854 u8 iProduct; 1855 1856 /* 1857 * these variables may have been set in 1858 * usb_composite_overwrite_options() 1859 */ 1860 idVendor = new->idVendor; 1861 idProduct = new->idProduct; 1862 bcdDevice = new->bcdDevice; 1863 iSerialNumber = new->iSerialNumber; 1864 iManufacturer = new->iManufacturer; 1865 iProduct = new->iProduct; 1866 1867 *new = *old; 1868 if (idVendor) 1869 new->idVendor = idVendor; 1870 if (idProduct) 1871 new->idProduct = idProduct; 1872 if (bcdDevice) 1873 new->bcdDevice = bcdDevice; 1874 else 1875 new->bcdDevice = cpu_to_le16(get_default_bcdDevice()); 1876 if (iSerialNumber) 1877 new->iSerialNumber = iSerialNumber; 1878 if (iManufacturer) 1879 new->iManufacturer = iManufacturer; 1880 if (iProduct) 1881 new->iProduct = iProduct; 1882} 1883 1884int composite_dev_prepare(struct usb_composite_driver *composite, 1885 struct usb_composite_dev *cdev) 1886{ 1887 struct usb_gadget *gadget = cdev->gadget; 1888 int ret = -ENOMEM; 1889 1890 /* preallocate control response and buffer */ 1891 cdev->req = usb_ep_alloc_request(gadget->ep0, GFP_KERNEL); 1892 if (!cdev->req) 1893 return -ENOMEM; 1894 1895 cdev->req->buf = kmalloc(USB_COMP_EP0_BUFSIZ, GFP_KERNEL); 1896 if (!cdev->req->buf) 1897 goto fail; 1898 1899 ret = device_create_file(&gadget->dev, &dev_attr_suspended); 1900 if (ret) 1901 goto fail_dev; 1902 1903 cdev->req->complete = composite_setup_complete; 1904 gadget->ep0->driver_data = cdev; 1905 1906 cdev->driver = composite; 1907 1908 /* 1909 * As per USB compliance update, a device that is actively drawing 1910 * more than 100mA from USB must report itself as bus-powered in 1911 * the GetStatus(DEVICE) call. 1912 */ 1913 if (CONFIG_USB_GADGET_VBUS_DRAW <= USB_SELF_POWER_VBUS_MAX_DRAW) 1914 usb_gadget_set_selfpowered(gadget); 1915 1916 /* interface and string IDs start at zero via kzalloc. 1917 * we force endpoints to start unassigned; few controller 1918 * drivers will zero ep->driver_data. 1919 */ 1920 usb_ep_autoconfig_reset(gadget); 1921 return 0; 1922fail_dev: 1923 kfree(cdev->req->buf); 1924fail: 1925 usb_ep_free_request(gadget->ep0, cdev->req); 1926 cdev->req = NULL; 1927 return ret; 1928} 1929 1930int composite_os_desc_req_prepare(struct usb_composite_dev *cdev, 1931 struct usb_ep *ep0) 1932{ 1933 int ret = 0; 1934 1935 cdev->os_desc_req = usb_ep_alloc_request(ep0, GFP_KERNEL); 1936 if (!cdev->os_desc_req) { 1937 ret = PTR_ERR(cdev->os_desc_req); 1938 goto end; 1939 } 1940 1941 /* OS feature descriptor length <= 4kB */ 1942 cdev->os_desc_req->buf = kmalloc(4096, GFP_KERNEL); 1943 if (!cdev->os_desc_req->buf) { 1944 ret = PTR_ERR(cdev->os_desc_req->buf); 1945 kfree(cdev->os_desc_req); 1946 goto end; 1947 } 1948 cdev->os_desc_req->complete = composite_setup_complete; 1949end: 1950 return ret; 1951} 1952 1953void composite_dev_cleanup(struct usb_composite_dev *cdev) 1954{ 1955 struct usb_gadget_string_container *uc, *tmp; 1956 1957 list_for_each_entry_safe(uc, tmp, &cdev->gstrings, list) { 1958 list_del(&uc->list); 1959 kfree(uc); 1960 } 1961 if (cdev->os_desc_req) { 1962 kfree(cdev->os_desc_req->buf); 1963 usb_ep_free_request(cdev->gadget->ep0, cdev->os_desc_req); 1964 } 1965 if (cdev->req) { 1966 kfree(cdev->req->buf); 1967 usb_ep_free_request(cdev->gadget->ep0, cdev->req); 1968 } 1969 cdev->next_string_id = 0; 1970 device_remove_file(&cdev->gadget->dev, &dev_attr_suspended); 1971} 1972 1973static int composite_bind(struct usb_gadget *gadget, 1974 struct usb_gadget_driver *gdriver) 1975{ 1976 struct usb_composite_dev *cdev; 1977 struct usb_composite_driver *composite = to_cdriver(gdriver); 1978 int status = -ENOMEM; 1979 1980 cdev = kzalloc(sizeof *cdev, GFP_KERNEL); 1981 if (!cdev) 1982 return status; 1983 1984 spin_lock_init(&cdev->lock); 1985 cdev->gadget = gadget; 1986 set_gadget_data(gadget, cdev); 1987 INIT_LIST_HEAD(&cdev->configs); 1988 INIT_LIST_HEAD(&cdev->gstrings); 1989 1990 status = composite_dev_prepare(composite, cdev); 1991 if (status) 1992 goto fail; 1993 1994 /* composite gadget needs to assign strings for whole device (like 1995 * serial number), register function drivers, potentially update 1996 * power state and consumption, etc 1997 */ 1998 status = composite->bind(cdev); 1999 if (status < 0) 2000 goto fail; 2001 2002 if (cdev->use_os_string) { 2003 status = composite_os_desc_req_prepare(cdev, gadget->ep0); 2004 if (status) 2005 goto fail; 2006 } 2007 2008 update_unchanged_dev_desc(&cdev->desc, composite->dev); 2009 2010 /* has userspace failed to provide a serial number? */ 2011 if (composite->needs_serial && !cdev->desc.iSerialNumber) 2012 WARNING(cdev, "userspace failed to provide iSerialNumber\n"); 2013 2014 INFO(cdev, "%s ready\n", composite->name); 2015 return 0; 2016 2017fail: 2018 __composite_unbind(gadget, false); 2019 return status; 2020} 2021 2022/*-------------------------------------------------------------------------*/ 2023 2024static void 2025composite_suspend(struct usb_gadget *gadget) 2026{ 2027 struct usb_composite_dev *cdev = get_gadget_data(gadget); 2028 struct usb_function *f; 2029 2030 /* REVISIT: should we have config level 2031 * suspend/resume callbacks? 2032 */ 2033 DBG(cdev, "suspend\n"); 2034 if (cdev->config) { 2035 list_for_each_entry(f, &cdev->config->functions, list) { 2036 if (f->suspend) 2037 f->suspend(f); 2038 } 2039 } 2040 if (cdev->driver->suspend) 2041 cdev->driver->suspend(cdev); 2042 2043 cdev->suspended = 1; 2044 2045 usb_gadget_vbus_draw(gadget, 2); 2046} 2047 2048static void 2049composite_resume(struct usb_gadget *gadget) 2050{ 2051 struct usb_composite_dev *cdev = get_gadget_data(gadget); 2052 struct usb_function *f; 2053 u16 maxpower; 2054 2055 /* REVISIT: should we have config level 2056 * suspend/resume callbacks? 2057 */ 2058 DBG(cdev, "resume\n"); 2059 if (cdev->driver->resume) 2060 cdev->driver->resume(cdev); 2061 if (cdev->config) { 2062 list_for_each_entry(f, &cdev->config->functions, list) { 2063 if (f->resume) 2064 f->resume(f); 2065 } 2066 2067 maxpower = cdev->config->MaxPower; 2068 2069 usb_gadget_vbus_draw(gadget, maxpower ? 2070 maxpower : CONFIG_USB_GADGET_VBUS_DRAW); 2071 } 2072 2073 cdev->suspended = 0; 2074} 2075 2076/*-------------------------------------------------------------------------*/ 2077 2078static const struct usb_gadget_driver composite_driver_template = { 2079 .bind = composite_bind, 2080 .unbind = composite_unbind, 2081 2082 .setup = composite_setup, 2083 .reset = composite_disconnect, 2084 .disconnect = composite_disconnect, 2085 2086 .suspend = composite_suspend, 2087 .resume = composite_resume, 2088 2089 .driver = { 2090 .owner = THIS_MODULE, 2091 }, 2092}; 2093 2094/** 2095 * usb_composite_probe() - register a composite driver 2096 * @driver: the driver to register 2097 * 2098 * Context: single threaded during gadget setup 2099 * 2100 * This function is used to register drivers using the composite driver 2101 * framework. The return value is zero, or a negative errno value. 2102 * Those values normally come from the driver's @bind method, which does 2103 * all the work of setting up the driver to match the hardware. 2104 * 2105 * On successful return, the gadget is ready to respond to requests from 2106 * the host, unless one of its components invokes usb_gadget_disconnect() 2107 * while it was binding. That would usually be done in order to wait for 2108 * some userspace participation. 2109 */ 2110int usb_composite_probe(struct usb_composite_driver *driver) 2111{ 2112 struct usb_gadget_driver *gadget_driver; 2113 2114 if (!driver || !driver->dev || !driver->bind) 2115 return -EINVAL; 2116 2117 if (!driver->name) 2118 driver->name = "composite"; 2119 2120 driver->gadget_driver = composite_driver_template; 2121 gadget_driver = &driver->gadget_driver; 2122 2123 gadget_driver->function = (char *) driver->name; 2124 gadget_driver->driver.name = driver->name; 2125 gadget_driver->max_speed = driver->max_speed; 2126 2127 return usb_gadget_probe_driver(gadget_driver); 2128} 2129EXPORT_SYMBOL_GPL(usb_composite_probe); 2130 2131/** 2132 * usb_composite_unregister() - unregister a composite driver 2133 * @driver: the driver to unregister 2134 * 2135 * This function is used to unregister drivers using the composite 2136 * driver framework. 2137 */ 2138void usb_composite_unregister(struct usb_composite_driver *driver) 2139{ 2140 usb_gadget_unregister_driver(&driver->gadget_driver); 2141} 2142EXPORT_SYMBOL_GPL(usb_composite_unregister); 2143 2144/** 2145 * usb_composite_setup_continue() - Continue with the control transfer 2146 * @cdev: the composite device who's control transfer was kept waiting 2147 * 2148 * This function must be called by the USB function driver to continue 2149 * with the control transfer's data/status stage in case it had requested to 2150 * delay the data/status stages. A USB function's setup handler (e.g. set_alt()) 2151 * can request the composite framework to delay the setup request's data/status 2152 * stages by returning USB_GADGET_DELAYED_STATUS. 2153 */ 2154void usb_composite_setup_continue(struct usb_composite_dev *cdev) 2155{ 2156 int value; 2157 struct usb_request *req = cdev->req; 2158 unsigned long flags; 2159 2160 DBG(cdev, "%s\n", __func__); 2161 spin_lock_irqsave(&cdev->lock, flags); 2162 2163 if (cdev->delayed_status == 0) { 2164 WARN(cdev, "%s: Unexpected call\n", __func__); 2165 2166 } else if (--cdev->delayed_status == 0) { 2167 DBG(cdev, "%s: Completing delayed status\n", __func__); 2168 req->length = 0; 2169 value = usb_ep_queue(cdev->gadget->ep0, req, GFP_ATOMIC); 2170 if (value < 0) { 2171 DBG(cdev, "ep_queue --> %d\n", value); 2172 req->status = 0; 2173 composite_setup_complete(cdev->gadget->ep0, req); 2174 } 2175 } 2176 2177 spin_unlock_irqrestore(&cdev->lock, flags); 2178} 2179EXPORT_SYMBOL_GPL(usb_composite_setup_continue); 2180 2181static char *composite_default_mfr(struct usb_gadget *gadget) 2182{ 2183 char *mfr; 2184 int len; 2185 2186 len = snprintf(NULL, 0, "%s %s with %s", init_utsname()->sysname, 2187 init_utsname()->release, gadget->name); 2188 len++; 2189 mfr = kmalloc(len, GFP_KERNEL); 2190 if (!mfr) 2191 return NULL; 2192 snprintf(mfr, len, "%s %s with %s", init_utsname()->sysname, 2193 init_utsname()->release, gadget->name); 2194 return mfr; 2195} 2196 2197void usb_composite_overwrite_options(struct usb_composite_dev *cdev, 2198 struct usb_composite_overwrite *covr) 2199{ 2200 struct usb_device_descriptor *desc = &cdev->desc; 2201 struct usb_gadget_strings *gstr = cdev->driver->strings[0]; 2202 struct usb_string *dev_str = gstr->strings; 2203 2204 if (covr->idVendor) 2205 desc->idVendor = cpu_to_le16(covr->idVendor); 2206 2207 if (covr->idProduct) 2208 desc->idProduct = cpu_to_le16(covr->idProduct); 2209 2210 if (covr->bcdDevice) 2211 desc->bcdDevice = cpu_to_le16(covr->bcdDevice); 2212 2213 if (covr->serial_number) { 2214 desc->iSerialNumber = dev_str[USB_GADGET_SERIAL_IDX].id; 2215 dev_str[USB_GADGET_SERIAL_IDX].s = covr->serial_number; 2216 } 2217 if (covr->manufacturer) { 2218 desc->iManufacturer = dev_str[USB_GADGET_MANUFACTURER_IDX].id; 2219 dev_str[USB_GADGET_MANUFACTURER_IDX].s = covr->manufacturer; 2220 2221 } else if (!strlen(dev_str[USB_GADGET_MANUFACTURER_IDX].s)) { 2222 desc->iManufacturer = dev_str[USB_GADGET_MANUFACTURER_IDX].id; 2223 cdev->def_manufacturer = composite_default_mfr(cdev->gadget); 2224 dev_str[USB_GADGET_MANUFACTURER_IDX].s = cdev->def_manufacturer; 2225 } 2226 2227 if (covr->product) { 2228 desc->iProduct = dev_str[USB_GADGET_PRODUCT_IDX].id; 2229 dev_str[USB_GADGET_PRODUCT_IDX].s = covr->product; 2230 } 2231} 2232EXPORT_SYMBOL_GPL(usb_composite_overwrite_options); 2233 2234MODULE_LICENSE("GPL"); 2235MODULE_AUTHOR("David Brownell"); 2236