MdeModulePkg/Bus/Usb/UsbBusDxe/UsbBus.c

   1 /** @file
   2
   3     Usb Bus Driver Binding and Bus IO Protocol.
   4
   5 Copyright (c) 2004 - 2012, Intel Corporation. All rights reserved.<BR>
   6 This program and the accompanying materials
   7 are licensed and made available under the terms and conditions of the BSD License
   8 which accompanies this distribution.  The full text of the license may be found at
   9 http://opensource.org/licenses/bsd-license.php
  10
  11 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  12 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  13
  14 **/
  15
  16 #include "UsbBus.h"
  17
  18 EFI_USB_IO_PROTOCOL mUsbIoProtocol = {
  19   UsbIoControlTransfer,
  20   UsbIoBulkTransfer,
  21   UsbIoAsyncInterruptTransfer,
  22   UsbIoSyncInterruptTransfer,
  23   UsbIoIsochronousTransfer,
  24   UsbIoAsyncIsochronousTransfer,
  25   UsbIoGetDeviceDescriptor,
  26   UsbIoGetActiveConfigDescriptor,
  27   UsbIoGetInterfaceDescriptor,
  28   UsbIoGetEndpointDescriptor,
  29   UsbIoGetStringDescriptor,
  30   UsbIoGetSupportedLanguages,
  31   UsbIoPortReset
  32 };
  33
  34 EFI_DRIVER_BINDING_PROTOCOL mUsbBusDriverBinding = {
  35   UsbBusControllerDriverSupported,
  36   UsbBusControllerDriverStart,
  37   UsbBusControllerDriverStop,
  38   0xa,
  39   NULL,
  40   NULL
  41 };
  42
  43 /**
  44   USB_IO function to execute a control transfer. This
  45   function will execute the USB transfer. If transfer
  46   successes, it will sync the internal state of USB bus
  47   with device state.
  48
  49   @param  This                   The USB_IO instance
  50   @param  Request                The control transfer request
  51   @param  Direction              Direction for data stage
  52   @param  Timeout                The time to wait before timeout
  53   @param  Data                   The buffer holding the data
  54   @param  DataLength             Then length of the data
  55   @param  UsbStatus              USB result
  56
  57   @retval EFI_INVALID_PARAMETER  The parameters are invalid
  58   @retval EFI_SUCCESS            The control transfer succeeded.
  59   @retval Others                 Failed to execute the transfer
  60
  61 **/
  62 EFI_STATUS
  63 EFIAPI
  64 UsbIoControlTransfer (
  65   IN  EFI_USB_IO_PROTOCOL     *This,
  66   IN  EFI_USB_DEVICE_REQUEST  *Request,
  67   IN  EFI_USB_DATA_DIRECTION  Direction,
  68   IN  UINT32                  Timeout,
  69   IN  OUT VOID                *Data,      OPTIONAL
  70   IN  UINTN                   DataLength, OPTIONAL
  71   OUT UINT32                  *UsbStatus
  72   )
  73 {
  74   USB_DEVICE              *Dev;
  75   USB_INTERFACE           *UsbIf;
  76   USB_ENDPOINT_DESC       *EpDesc;
  77   EFI_TPL                 OldTpl;
  78   EFI_STATUS              Status;
  79
  80   if (UsbStatus == NULL) {
  81     return EFI_INVALID_PARAMETER;
  82   }
  83
  84   OldTpl = gBS->RaiseTPL (USB_BUS_TPL);
  85
  86   UsbIf  = USB_INTERFACE_FROM_USBIO (This);
  87   Dev    = UsbIf->Device;
  88
  89   Status = UsbHcControlTransfer (
  90              Dev->Bus,
  91              Dev->Address,
  92              Dev->Speed,
  93              Dev->MaxPacket0,
  94              Request,
  95              Direction,
  96              Data,
  97              &DataLength,
  98              (UINTN) Timeout,
  99              &Dev->Translator,
 100              UsbStatus
 101              );
 102
 103   if (EFI_ERROR (Status) || (*UsbStatus != EFI_USB_NOERROR)) {
 104     //
 105     // Clear TT buffer when CTRL/BULK split transaction failes
 106     // Clear the TRANSLATOR TT buffer, not parent's buffer
 107     //
 108     ASSERT (Dev->Translator.TranslatorHubAddress < Dev->Bus->MaxDevices);
 109     if (Dev->Translator.TranslatorHubAddress != 0) {
 110       UsbHubCtrlClearTTBuffer (
 111         Dev->Bus->Devices[Dev->Translator.TranslatorHubAddress],
 112         Dev->Translator.TranslatorPortNumber,
 113         Dev->Address,
 114         0,
 115         USB_ENDPOINT_CONTROL
 116         );
 117     }
 118
 119     goto ON_EXIT;
 120   }
 121
 122   //
 123   // Some control transfer will change the device's internal
 124   // status, such as Set_Configuration and Set_Interface.
 125   // We must synchronize the bus driver's status with that in
 126   // device. We ignore the Set_Descriptor request because it's
 127   // hardly used by any device, especially in pre-boot environment
 128   //
 129
 130   //
 131   // Reset the endpoint toggle when endpoint stall is cleared
 132   //
 133   if ((Request->Request     == USB_REQ_CLEAR_FEATURE) &&
 134       (Request->RequestType == USB_REQUEST_TYPE (EfiUsbNoData, USB_REQ_TYPE_STANDARD,
 135                                                  USB_TARGET_ENDPOINT)) &&
 136       (Request->Value       == USB_FEATURE_ENDPOINT_HALT)) {
 137
 138     EpDesc = UsbGetEndpointDesc (UsbIf, (UINT8) Request->Index);
 139
 140     if (EpDesc != NULL) {
 141       EpDesc->Toggle = 0;
 142     }
 143   }
 144
 145   //
 146   // Select a new configuration. This is a dangerous action. Upper driver
 147   // should stop use its current UsbIo after calling this driver. The old
 148   // UsbIo will be uninstalled and new UsbIo be installed. We can't use
 149   // ReinstallProtocol since interfaces in different configuration may be
 150   // completely irrelevant.
 151   //
 152   if ((Request->Request == USB_REQ_SET_CONFIG) &&
 153       (Request->RequestType == USB_REQUEST_TYPE (EfiUsbNoData, USB_REQ_TYPE_STANDARD,
 154                                                  USB_TARGET_DEVICE))) {
 155     //
 156     // Don't re-create the USB interfaces if configuration isn't changed.
 157     //
 158     if ((Dev->ActiveConfig != NULL) &&
 159         (Request->Value == Dev->ActiveConfig->Desc.ConfigurationValue)) {
 160
 161       goto ON_EXIT;
 162     }
 163     DEBUG ((EFI_D_INFO, "UsbIoControlTransfer: configure changed!!! Do NOT use old UsbIo!!!\n"));
 164
 165     if (Dev->ActiveConfig != NULL) {
 166       UsbRemoveConfig (Dev);
 167     }
 168
 169     if (Request->Value != 0) {
 170       Status = UsbSelectConfig (Dev, (UINT8) Request->Value);
 171     }
 172
 173     //
 174     // Exit now, Old USB_IO is invalid now
 175     //
 176     goto ON_EXIT;
 177   }
 178
 179   //
 180   // A new alternative setting is selected for the interface.
 181   // No need to reinstall UsbIo in this case because only
 182   // underlying communication endpoints are changed. Functionality
 183   // should remains the same.
 184   //
 185   if ((Request->Request     == USB_REQ_SET_INTERFACE) &&
 186       (Request->RequestType == USB_REQUEST_TYPE (EfiUsbNoData, USB_REQ_TYPE_STANDARD,
 187                                                  USB_TARGET_INTERFACE)) &&
 188       (Request->Index       == UsbIf->IfSetting->Desc.InterfaceNumber)) {
 189
 190     Status = UsbSelectSetting (UsbIf->IfDesc, (UINT8) Request->Value);
 191
 192     if (!EFI_ERROR (Status)) {
 193       ASSERT (UsbIf->IfDesc->ActiveIndex < USB_MAX_INTERFACE_SETTING);
 194       UsbIf->IfSetting = UsbIf->IfDesc->Settings[UsbIf->IfDesc->ActiveIndex];
 195     }
 196   }
 197
 198 ON_EXIT:
 199   gBS->RestoreTPL (OldTpl);
 200   return Status;
 201 }
 202
 203
 204 /**
 205   Execute a bulk transfer to the device endpoint.
 206
 207   @param  This                   The USB IO instance.
 208   @param  Endpoint               The device endpoint.
 209   @param  Data                   The data to transfer.
 210   @param  DataLength             The length of the data to transfer.
 211   @param  Timeout                Time to wait before timeout.
 212   @param  UsbStatus              The result of USB transfer.
 213
 214   @retval EFI_SUCCESS            The bulk transfer is OK.
 215   @retval EFI_INVALID_PARAMETER  Some parameters are invalid.
 216   @retval Others                 Failed to execute transfer, reason returned in
 217                                  UsbStatus.
 218
 219 **/
 220 EFI_STATUS
 221 EFIAPI
 222 UsbIoBulkTransfer (
 223   IN  EFI_USB_IO_PROTOCOL *This,
 224   IN  UINT8               Endpoint,
 225   IN  OUT VOID            *Data,
 226   IN  OUT UINTN           *DataLength,
 227   IN  UINTN               Timeout,
 228   OUT UINT32              *UsbStatus
 229   )
 230 {
 231   USB_DEVICE              *Dev;
 232   USB_INTERFACE           *UsbIf;
 233   USB_ENDPOINT_DESC       *EpDesc;
 234   UINT8                   BufNum;
 235   UINT8                   Toggle;
 236   EFI_TPL                 OldTpl;
 237   EFI_STATUS              Status;
 238
 239   if ((USB_ENDPOINT_ADDR (Endpoint) == 0) || (USB_ENDPOINT_ADDR(Endpoint) > 15) ||
 240       (UsbStatus == NULL)) {
 241
 242     return EFI_INVALID_PARAMETER;
 243   }
 244
 245   OldTpl  = gBS->RaiseTPL (USB_BUS_TPL);
 246
 247   UsbIf   = USB_INTERFACE_FROM_USBIO (This);
 248   Dev     = UsbIf->Device;
 249
 250   EpDesc  = UsbGetEndpointDesc (UsbIf, Endpoint);
 251
 252   if ((EpDesc == NULL) || (USB_ENDPOINT_TYPE (&EpDesc->Desc) != USB_ENDPOINT_BULK)) {
 253     Status = EFI_INVALID_PARAMETER;
 254     goto ON_EXIT;
 255   }
 256
 257   BufNum  = 1;
 258   Toggle  = EpDesc->Toggle;
 259   Status  = UsbHcBulkTransfer (
 260               Dev->Bus,
 261               Dev->Address,
 262               Endpoint,
 263               Dev->Speed,
 264               EpDesc->Desc.MaxPacketSize,
 265               BufNum,
 266               &Data,
 267               DataLength,
 268               &Toggle,
 269               Timeout,
 270               &Dev->Translator,
 271               UsbStatus
 272               );
 273
 274   EpDesc->Toggle = Toggle;
 275
 276   if (EFI_ERROR (Status) || (*UsbStatus != EFI_USB_NOERROR)) {
 277     //
 278     // Clear TT buffer when CTRL/BULK split transaction failes.
 279     // Clear the TRANSLATOR TT buffer, not parent's buffer
 280     //
 281     ASSERT (Dev->Translator.TranslatorHubAddress < Dev->Bus->MaxDevices);
 282     if (Dev->Translator.TranslatorHubAddress != 0) {
 283       UsbHubCtrlClearTTBuffer (
 284         Dev->Bus->Devices[Dev->Translator.TranslatorHubAddress],
 285         Dev->Translator.TranslatorPortNumber,
 286         Dev->Address,
 287         0,
 288         USB_ENDPOINT_BULK
 289         );
 290     }
 291   }
 292
 293 ON_EXIT:
 294   gBS->RestoreTPL (OldTpl);
 295   return Status;
 296 }
 297
 298
 299 /**
 300   Execute a synchronous interrupt transfer.
 301
 302   @param  This                   The USB IO instance.
 303   @param  Endpoint               The device endpoint.
 304   @param  Data                   The data to transfer.
 305   @param  DataLength             The length of the data to transfer.
 306   @param  Timeout                Time to wait before timeout.
 307   @param  UsbStatus              The result of USB transfer.
 308
 309   @retval EFI_SUCCESS            The synchronous interrupt transfer is OK.
 310   @retval EFI_INVALID_PARAMETER  Some parameters are invalid.
 311   @retval Others                 Failed to execute transfer, reason returned in
 312                                  UsbStatus.
 313
 314 **/
 315 EFI_STATUS
 316 EFIAPI
 317 UsbIoSyncInterruptTransfer (
 318   IN  EFI_USB_IO_PROTOCOL *This,
 319   IN  UINT8               Endpoint,
 320   IN  OUT VOID            *Data,
 321   IN  OUT UINTN           *DataLength,
 322   IN  UINTN               Timeout,
 323   OUT UINT32              *UsbStatus
 324   )
 325 {
 326   USB_DEVICE              *Dev;
 327   USB_INTERFACE           *UsbIf;
 328   USB_ENDPOINT_DESC       *EpDesc;
 329   EFI_TPL                 OldTpl;
 330   UINT8                   Toggle;
 331   EFI_STATUS              Status;
 332
 333   if ((USB_ENDPOINT_ADDR (Endpoint) == 0) || (USB_ENDPOINT_ADDR(Endpoint) > 15) ||
 334       (UsbStatus == NULL)) {
 335
 336     return EFI_INVALID_PARAMETER;
 337   }
 338
 339   OldTpl  = gBS->RaiseTPL (USB_BUS_TPL);
 340
 341   UsbIf   = USB_INTERFACE_FROM_USBIO (This);
 342   Dev     = UsbIf->Device;
 343
 344   EpDesc  = UsbGetEndpointDesc (UsbIf, Endpoint);
 345
 346   if ((EpDesc == NULL) || (USB_ENDPOINT_TYPE (&EpDesc->Desc) != USB_ENDPOINT_INTERRUPT)) {
 347     Status = EFI_INVALID_PARAMETER;
 348     goto ON_EXIT;
 349   }
 350
 351   Toggle = EpDesc->Toggle;
 352   Status = UsbHcSyncInterruptTransfer (
 353              Dev->Bus,
 354              Dev->Address,
 355              Endpoint,
 356              Dev->Speed,
 357              EpDesc->Desc.MaxPacketSize,
 358              Data,
 359              DataLength,
 360              &Toggle,
 361              Timeout,
 362              &Dev->Translator,
 363              UsbStatus
 364              );
 365
 366   EpDesc->Toggle = Toggle;
 367
 368 ON_EXIT:
 369   gBS->RestoreTPL (OldTpl);
 370   return Status;
 371 }
 372
 373
 374 /**
 375   Queue a new asynchronous interrupt transfer, or remove the old
 376   request if (IsNewTransfer == FALSE).
 377
 378   @param  This                   The USB_IO instance.
 379   @param  Endpoint               The device endpoint.
 380   @param  IsNewTransfer          Whether this is a new request, if it's old, remove
 381                                  the request.
 382   @param  PollInterval           The interval to poll the transfer result, (in ms).
 383   @param  DataLength             The length of perodic data transfer.
 384   @param  Callback               The function to call periodicaly when transfer is
 385                                  ready.
 386   @param  Context                The context to the callback.
 387
 388   @retval EFI_SUCCESS            New transfer is queued or old request is removed.
 389   @retval EFI_INVALID_PARAMETER  Some parameters are invalid.
 390   @retval Others                 Failed to queue the new request or remove the old
 391                                  request.
 392
 393 **/
 394 EFI_STATUS
 395 EFIAPI
 396 UsbIoAsyncInterruptTransfer (
 397   IN EFI_USB_IO_PROTOCOL              *This,
 398   IN UINT8                            Endpoint,
 399   IN BOOLEAN                          IsNewTransfer,
 400   IN UINTN                            PollInterval,       OPTIONAL
 401   IN UINTN                            DataLength,         OPTIONAL
 402   IN EFI_ASYNC_USB_TRANSFER_CALLBACK  Callback,           OPTIONAL
 403   IN VOID                             *Context            OPTIONAL
 404   )
 405 {
 406   USB_DEVICE              *Dev;
 407   USB_INTERFACE           *UsbIf;
 408   USB_ENDPOINT_DESC       *EpDesc;
 409   EFI_TPL                 OldTpl;
 410   UINT8                   Toggle;
 411   EFI_STATUS              Status;
 412
 413   if ((USB_ENDPOINT_ADDR (Endpoint) == 0) || (USB_ENDPOINT_ADDR (Endpoint) > 15)) {
 414     return EFI_INVALID_PARAMETER;
 415   }
 416
 417   OldTpl  = gBS->RaiseTPL (USB_BUS_TPL);
 418   UsbIf   = USB_INTERFACE_FROM_USBIO (This);
 419   Dev     = UsbIf->Device;
 420
 421   EpDesc  = UsbGetEndpointDesc (UsbIf, Endpoint);
 422
 423   if ((EpDesc == NULL) || (USB_ENDPOINT_TYPE (&EpDesc->Desc) != USB_ENDPOINT_INTERRUPT)) {
 424     Status = EFI_INVALID_PARAMETER;
 425     goto ON_EXIT;
 426   }
 427
 428   Toggle  = EpDesc->Toggle;
 429   Status  = UsbHcAsyncInterruptTransfer (
 430               Dev->Bus,
 431               Dev->Address,
 432               Endpoint,
 433               Dev->Speed,
 434               EpDesc->Desc.MaxPacketSize,
 435               IsNewTransfer,
 436               &Toggle,
 437               PollInterval,
 438               DataLength,
 439               &Dev->Translator,
 440               Callback,
 441               Context
 442               );
 443
 444   EpDesc->Toggle = Toggle;
 445
 446 ON_EXIT:
 447   gBS->RestoreTPL (OldTpl);
 448   return Status;
 449 }
 450
 451
 452 /**
 453   Execute a synchronous isochronous transfer.
 454
 455   @param  This                   The USB IO instance.
 456   @param  DeviceEndpoint         The device endpoint.
 457   @param  Data                   The data to transfer.
 458   @param  DataLength             The length of the data to transfer.
 459   @param  UsbStatus              The result of USB transfer.
 460
 461   @retval EFI_UNSUPPORTED        Currently isochronous transfer isn't supported.
 462
 463 **/
 464 EFI_STATUS
 465 EFIAPI
 466 UsbIoIsochronousTransfer (
 467   IN  EFI_USB_IO_PROTOCOL *This,
 468   IN  UINT8               DeviceEndpoint,
 469   IN  OUT VOID            *Data,
 470   IN  UINTN               DataLength,
 471   OUT UINT32              *Status
 472   )
 473 {
 474   return EFI_UNSUPPORTED;
 475 }
 476
 477
 478 /**
 479   Queue an asynchronous isochronous transfer.
 480
 481   @param  This                   The USB_IO instance.
 482   @param  DeviceEndpoint         The device endpoint.
 483   @param  Data                   The data to transfer.
 484   @param  DataLength             The length of perodic data transfer.
 485   @param  IsochronousCallBack    The function to call periodicaly when transfer is
 486                                  ready.
 487   @param  Context                The context to the callback.
 488
 489   @retval EFI_UNSUPPORTED        Currently isochronous transfer isn't supported.
 490
 491 **/
 492 EFI_STATUS
 493 EFIAPI
 494 UsbIoAsyncIsochronousTransfer (
 495   IN EFI_USB_IO_PROTOCOL              *This,
 496   IN UINT8                            DeviceEndpoint,
 497   IN OUT VOID                         *Data,
 498   IN UINTN                            DataLength,
 499   IN EFI_ASYNC_USB_TRANSFER_CALLBACK  IsochronousCallBack,
 500   IN VOID                             *Context              OPTIONAL
 501   )
 502 {
 503   return EFI_UNSUPPORTED;
 504 }
 505
 506
 507 /**
 508   Retrieve the device descriptor of the device.
 509
 510   @param  This                   The USB IO instance.
 511   @param  Descriptor             The variable to receive the device descriptor.
 512
 513   @retval EFI_SUCCESS            The device descriptor is returned.
 514   @retval EFI_INVALID_PARAMETER  The parameter is invalid.
 515
 516 **/
 517 EFI_STATUS
 518 EFIAPI
 519 UsbIoGetDeviceDescriptor (
 520   IN  EFI_USB_IO_PROTOCOL       *This,
 521   OUT EFI_USB_DEVICE_DESCRIPTOR *Descriptor
 522   )
 523 {
 524   USB_DEVICE              *Dev;
 525   USB_INTERFACE           *UsbIf;
 526   EFI_TPL                 OldTpl;
 527
 528   if (Descriptor == NULL) {
 529     return EFI_INVALID_PARAMETER;
 530   }
 531
 532   OldTpl = gBS->RaiseTPL (USB_BUS_TPL);
 533
 534   UsbIf  = USB_INTERFACE_FROM_USBIO (This);
 535   Dev    = UsbIf->Device;
 536
 537   CopyMem (Descriptor, &Dev->DevDesc->Desc, sizeof (EFI_USB_DEVICE_DESCRIPTOR));
 538
 539   gBS->RestoreTPL (OldTpl);
 540   return EFI_SUCCESS;
 541 }
 542
 543
 544 /**
 545   Return the configuration descriptor of the current active configuration.
 546
 547   @param  This                   The USB IO instance.
 548   @param  Descriptor             The USB configuration descriptor.
 549
 550   @retval EFI_SUCCESS            The active configuration descriptor is returned.
 551   @retval EFI_INVALID_PARAMETER  Some parameter is invalid.
 552   @retval EFI_NOT_FOUND          Currently no active configuration is selected.
 553
 554 **/
 555 EFI_STATUS
 556 EFIAPI
 557 UsbIoGetActiveConfigDescriptor (
 558   IN  EFI_USB_IO_PROTOCOL       *This,
 559   OUT EFI_USB_CONFIG_DESCRIPTOR *Descriptor
 560   )
 561 {
 562   USB_DEVICE              *Dev;
 563   USB_INTERFACE           *UsbIf;
 564   EFI_STATUS              Status;
 565   EFI_TPL                 OldTpl;
 566
 567   if (Descriptor == NULL) {
 568     return EFI_INVALID_PARAMETER;
 569   }
 570
 571   Status = EFI_SUCCESS;
 572   OldTpl = gBS->RaiseTPL (USB_BUS_TPL);
 573
 574   UsbIf  = USB_INTERFACE_FROM_USBIO (This);
 575   Dev    = UsbIf->Device;
 576
 577   if (Dev->ActiveConfig == NULL) {
 578     Status = EFI_NOT_FOUND;
 579     goto ON_EXIT;
 580   }
 581
 582   CopyMem (Descriptor, &(Dev->ActiveConfig->Desc), sizeof (EFI_USB_CONFIG_DESCRIPTOR));
 583
 584 ON_EXIT:
 585   gBS->RestoreTPL (OldTpl);
 586   return Status;
 587 }
 588
 589
 590 /**
 591   Retrieve the active interface setting descriptor for this USB IO instance.
 592
 593   @param  This                   The USB IO instance.
 594   @param  Descriptor             The variable to receive active interface setting.
 595
 596   @retval EFI_SUCCESS            The active interface setting is returned.
 597   @retval EFI_INVALID_PARAMETER  Some parameter is invalid.
 598
 599 **/
 600 EFI_STATUS
 601 EFIAPI
 602 UsbIoGetInterfaceDescriptor (
 603   IN  EFI_USB_IO_PROTOCOL           *This,
 604   OUT EFI_USB_INTERFACE_DESCRIPTOR  *Descriptor
 605   )
 606 {
 607   USB_INTERFACE           *UsbIf;
 608   EFI_TPL                 OldTpl;
 609
 610   if (Descriptor == NULL) {
 611     return EFI_INVALID_PARAMETER;
 612   }
 613
 614   OldTpl = gBS->RaiseTPL (USB_BUS_TPL);
 615
 616   UsbIf  = USB_INTERFACE_FROM_USBIO (This);
 617   CopyMem (Descriptor, &(UsbIf->IfSetting->Desc), sizeof (EFI_USB_INTERFACE_DESCRIPTOR));
 618
 619   gBS->RestoreTPL (OldTpl);
 620   return EFI_SUCCESS;
 621 }
 622
 623
 624 /**
 625   Retrieve the endpoint descriptor from this interface setting.
 626
 627   @param  This                   The USB IO instance.
 628   @param  Index                  The index (start from zero) of the endpoint to
 629                                  retrieve.
 630   @param  Descriptor             The variable to receive the descriptor.
 631
 632   @retval EFI_SUCCESS            The endpoint descriptor is returned.
 633   @retval EFI_INVALID_PARAMETER  Some parameter is invalid.
 634
 635 **/
 636 EFI_STATUS
 637 EFIAPI
 638 UsbIoGetEndpointDescriptor (
 639   IN  EFI_USB_IO_PROTOCOL         *This,
 640   IN  UINT8                       Index,
 641   OUT EFI_USB_ENDPOINT_DESCRIPTOR *Descriptor
 642   )
 643 {
 644   USB_INTERFACE           *UsbIf;
 645   EFI_TPL                 OldTpl;
 646
 647   OldTpl = gBS->RaiseTPL (USB_BUS_TPL);
 648
 649   UsbIf  = USB_INTERFACE_FROM_USBIO (This);
 650
 651   if ((Descriptor == NULL) || (Index > 15)) {
 652     gBS->RestoreTPL (OldTpl);
 653     return EFI_INVALID_PARAMETER;
 654   }
 655
 656   if (Index >= UsbIf->IfSetting->Desc.NumEndpoints) {
 657     gBS->RestoreTPL (OldTpl);
 658     return EFI_NOT_FOUND;
 659   }
 660
 661   CopyMem (
 662     Descriptor,
 663     &(UsbIf->IfSetting->Endpoints[Index]->Desc),
 664     sizeof (EFI_USB_ENDPOINT_DESCRIPTOR)
 665     );
 666
 667   gBS->RestoreTPL (OldTpl);
 668   return EFI_SUCCESS;
 669 }
 670
 671
 672 /**
 673   Retrieve the supported language ID table from the device.
 674
 675   @param  This                   The USB IO instance.
 676   @param  LangIDTable            The table to return the language IDs.
 677   @param  TableSize              The size, in bytes, of the table LangIDTable.
 678
 679   @retval EFI_SUCCESS            The language ID is return.
 680
 681 **/
 682 EFI_STATUS
 683 EFIAPI
 684 UsbIoGetSupportedLanguages (
 685   IN  EFI_USB_IO_PROTOCOL *This,
 686   OUT UINT16              **LangIDTable,
 687   OUT UINT16              *TableSize
 688   )
 689 {
 690   USB_DEVICE              *Dev;
 691   USB_INTERFACE           *UsbIf;
 692   EFI_TPL                 OldTpl;
 693
 694   OldTpl        = gBS->RaiseTPL (USB_BUS_TPL);
 695
 696   UsbIf         = USB_INTERFACE_FROM_USBIO (This);
 697   Dev           = UsbIf->Device;
 698
 699   *LangIDTable  = Dev->LangId;
 700   *TableSize    = (UINT16) (Dev->TotalLangId * sizeof (UINT16));
 701
 702   gBS->RestoreTPL (OldTpl);
 703   return EFI_SUCCESS;
 704 }
 705
 706
 707 /**
 708   Retrieve an indexed string in the language of LangID.
 709
 710   @param  This                   The USB IO instance.
 711   @param  LangID                 The language ID of the string to retrieve.
 712   @param  StringIndex            The index of the string.
 713   @param  String                 The variable to receive the string.
 714
 715   @retval EFI_SUCCESS            The string is returned.
 716   @retval EFI_NOT_FOUND          No such string existed.
 717
 718 **/
 719 EFI_STATUS
 720 EFIAPI
 721 UsbIoGetStringDescriptor (
 722   IN  EFI_USB_IO_PROTOCOL   *This,
 723   IN  UINT16                LangID,
 724   IN  UINT8                 StringIndex,
 725   OUT CHAR16                **String
 726   )
 727 {
 728   USB_DEVICE                *Dev;
 729   USB_INTERFACE             *UsbIf;
 730   EFI_USB_STRING_DESCRIPTOR *StrDesc;
 731   EFI_TPL                   OldTpl;
 732   UINT8                     *Buf;
 733   UINT8                     Index;
 734   EFI_STATUS                Status;
 735
 736   if ((StringIndex == 0) || (LangID == 0)) {
 737     return EFI_NOT_FOUND;
 738   }
 739
 740   OldTpl = gBS->RaiseTPL (USB_BUS_TPL);
 741
 742   UsbIf  = USB_INTERFACE_FROM_USBIO (This);
 743   Dev    = UsbIf->Device;
 744
 745   //
 746   // Check whether language ID is supported
 747   //
 748   Status = EFI_NOT_FOUND;
 749
 750   for (Index = 0; Index < Dev->TotalLangId; Index++) {
 751     ASSERT (Index < USB_MAX_LANG_ID);
 752     if (Dev->LangId[Index] == LangID) {
 753       break;
 754     }
 755   }
 756
 757   if (Index == Dev->TotalLangId) {
 758     goto ON_EXIT;
 759   }
 760
 761   //
 762   // Retrieve the string descriptor then allocate a buffer
 763   // to hold the string itself.
 764   //
 765   StrDesc = UsbGetOneString (Dev, StringIndex, LangID);
 766
 767   if (StrDesc == NULL) {
 768     goto ON_EXIT;
 769   }
 770
 771   if (StrDesc->Length <= 2) {
 772     goto FREE_STR;
 773   }
 774
 775   Buf = AllocateZeroPool (StrDesc->Length);
 776
 777   if (Buf == NULL) {
 778     Status = EFI_OUT_OF_RESOURCES;
 779     goto FREE_STR;
 780   }
 781
 782   CopyMem (Buf, StrDesc->String, StrDesc->Length - 2);
 783   *String = (CHAR16 *) Buf;
 784   Status  = EFI_SUCCESS;
 785
 786 FREE_STR:
 787   gBS->FreePool (StrDesc);
 788
 789 ON_EXIT:
 790   gBS->RestoreTPL (OldTpl);
 791   return Status;
 792 }
 793
 794
 795 /**
 796   Reset the device, then if that succeeds, reconfigure the
 797   device with its address and current active configuration.
 798
 799   @param  This                   The USB IO instance.
 800
 801   @retval EFI_SUCCESS            The device is reset and configured.
 802   @retval Others                 Failed to reset the device.
 803
 804 **/
 805 EFI_STATUS
 806 EFIAPI
 807 UsbIoPortReset (
 808   IN EFI_USB_IO_PROTOCOL  *This
 809   )
 810 {
 811   USB_INTERFACE           *UsbIf;
 812   USB_INTERFACE           *HubIf;
 813   USB_DEVICE              *Dev;
 814   EFI_TPL                 OldTpl;
 815   EFI_STATUS              Status;
 816
 817   OldTpl = gBS->RaiseTPL (USB_BUS_TPL);
 818
 819   UsbIf  = USB_INTERFACE_FROM_USBIO (This);
 820   Dev    = UsbIf->Device;
 821
 822   if (UsbIf->IsHub) {
 823     Status = EFI_INVALID_PARAMETER;
 824     goto ON_EXIT;
 825   }
 826
 827   HubIf  = Dev->ParentIf;
 828   Status = HubIf->HubApi->ResetPort (HubIf, Dev->ParentPort);
 829
 830   if (EFI_ERROR (Status)) {
 831     DEBUG (( EFI_D_ERROR, "UsbIoPortReset: failed to reset hub port %d@hub  %d, %r \n",
 832                 Dev->ParentPort, Dev->ParentAddr, Status));
 833
 834     goto ON_EXIT;
 835   }
 836
 837   //
 838   // Reset the device to its current address. The device now has an address
 839   // of ZERO after port reset, so need to set Dev->Address to the device again for
 840   // host to communicate with it.
 841   //
 842   Status  = UsbSetAddress (Dev, Dev->Address);
 843
 844   gBS->Stall (USB_SET_DEVICE_ADDRESS_STALL);
 845
 846   if (EFI_ERROR (Status)) {
 847     //
 848     // It may fail due to device disconnection or other reasons.
 849     //
 850     DEBUG (( EFI_D_ERROR, "UsbIoPortReset: failed to set address for device %d - %r\n",
 851                 Dev->Address, Status));
 852
 853     goto ON_EXIT;
 854   }
 855
 856   DEBUG (( EFI_D_INFO, "UsbIoPortReset: device is now ADDRESSED at %d\n", Dev->Address));
 857
 858   //
 859   // Reset the current active configure, after this device
 860   // is in CONFIGURED state.
 861   //
 862   if (Dev->ActiveConfig != NULL) {
 863     Status = UsbSetConfig (Dev, Dev->ActiveConfig->Desc.ConfigurationValue);
 864
 865     if (EFI_ERROR (Status)) {
 866       DEBUG (( EFI_D_ERROR, "UsbIoPortReset: failed to set configure for device %d - %r\n",
 867                   Dev->Address, Status));
 868     }
 869   }
 870
 871 ON_EXIT:
 872   gBS->RestoreTPL (OldTpl);
 873   return Status;
 874 }
 875
 876
 877 /**
 878   Install Usb Bus Protocol on host controller, and start the Usb bus.
 879
 880   @param This                    The USB bus driver binding instance.
 881   @param Controller              The controller to check.
 882   @param RemainingDevicePath     The remaining device patch.
 883
 884   @retval EFI_SUCCESS            The controller is controlled by the usb bus.
 885   @retval EFI_ALREADY_STARTED    The controller is already controlled by the usb bus.
 886   @retval EFI_OUT_OF_RESOURCES   Failed to allocate resources.
 887
 888 **/
 889 EFI_STATUS
 890 EFIAPI
 891 UsbBusBuildProtocol (
 892   IN EFI_DRIVER_BINDING_PROTOCOL  *This,
 893   IN EFI_HANDLE                   Controller,
 894   IN EFI_DEVICE_PATH_PROTOCOL     *RemainingDevicePath
 895   )
 896 {
 897   USB_BUS                 *UsbBus;
 898   USB_DEVICE              *RootHub;
 899   USB_INTERFACE           *RootIf;
 900   EFI_STATUS              Status;
 901   EFI_STATUS              Status2;
 902
 903   UsbBus = AllocateZeroPool (sizeof (USB_BUS));
 904
 905   if (UsbBus == NULL) {
 906     return EFI_OUT_OF_RESOURCES;
 907   }
 908
 909   UsbBus->Signature  = USB_BUS_SIGNATURE;
 910   UsbBus->HostHandle = Controller;
 911   UsbBus->MaxDevices = USB_MAX_DEVICES;
 912
 913   Status = gBS->OpenProtocol (
 914                   Controller,
 915                   &gEfiDevicePathProtocolGuid,
 916                   (VOID **) &UsbBus->DevicePath,
 917                   This->DriverBindingHandle,
 918                   Controller,
 919                   EFI_OPEN_PROTOCOL_BY_DRIVER
 920                   );
 921
 922   if (EFI_ERROR (Status)) {
 923     DEBUG ((EFI_D_ERROR, "UsbBusStart: Failed to open device path %r\n", Status));
 924
 925     FreePool (UsbBus);
 926     return Status;
 927   }
 928
 929   //
 930   // Get USB_HC2/USB_HC host controller protocol (EHCI/UHCI).
 931   // This is for backward compatibility with EFI 1.x. In UEFI
 932   // 2.x, USB_HC2 replaces USB_HC. We will open both USB_HC2
 933   // and USB_HC because EHCI driver will install both protocols
 934   // (for the same reason). If we don't consume both of them,
 935   // the unconsumed one may be opened by others.
 936   //
 937   Status = gBS->OpenProtocol (
 938                   Controller,
 939                   &gEfiUsb2HcProtocolGuid,
 940                   (VOID **) &(UsbBus->Usb2Hc),
 941                   This->DriverBindingHandle,
 942                   Controller,
 943                   EFI_OPEN_PROTOCOL_BY_DRIVER
 944                   );
 945
 946   Status2 = gBS->OpenProtocol (
 947                    Controller,
 948                    &gEfiUsbHcProtocolGuid,
 949                    (VOID **) &(UsbBus->UsbHc),
 950                    This->DriverBindingHandle,
 951                    Controller,
 952                    EFI_OPEN_PROTOCOL_BY_DRIVER
 953                    );
 954
 955   if (EFI_ERROR (Status) && EFI_ERROR (Status2)) {
 956     DEBUG ((EFI_D_ERROR, "UsbBusStart: Failed to open USB_HC/USB2_HC %r\n", Status));
 957
 958     Status = EFI_DEVICE_ERROR;
 959     goto CLOSE_HC;
 960   }
 961
 962   if (!EFI_ERROR (Status)) {
 963     //
 964     // The EFI_USB2_HC_PROTOCOL is produced for XHCI support.
 965     // Then its max supported devices are 256. Otherwise it's 128.
 966     //
 967     if (UsbBus->Usb2Hc->MajorRevision == 0x3) {
 968       UsbBus->MaxDevices = 256;
 969     }
 970   }
 971
 972   UsbHcReset (UsbBus, EFI_USB_HC_RESET_GLOBAL);
 973   UsbHcSetState (UsbBus, EfiUsbHcStateOperational);
 974
 975   //
 976   // Install an EFI_USB_BUS_PROTOCOL to host controller to identify it.
 977   //
 978   Status = gBS->InstallProtocolInterface (
 979                   &Controller,
 980                   &gEfiCallerIdGuid,
 981                   EFI_NATIVE_INTERFACE,
 982                   &UsbBus->BusId
 983                   );
 984
 985   if (EFI_ERROR (Status)) {
 986     DEBUG ((EFI_D_ERROR, "UsbBusStart: Failed to install bus protocol %r\n", Status));
 987     goto CLOSE_HC;
 988   }
 989
 990   //
 991   // Initial the wanted child device path list, and add first RemainingDevicePath
 992   //
 993   InitializeListHead (&UsbBus->WantedUsbIoDPList);
 994   Status = UsbBusAddWantedUsbIoDP (&UsbBus->BusId, RemainingDevicePath);
 995   ASSERT (!EFI_ERROR (Status));
 996   //
 997   // Create a fake usb device for root hub
 998   //
 999   RootHub = AllocateZeroPool (sizeof (USB_DEVICE));
1000
1001   if (RootHub == NULL) {
1002     Status = EFI_OUT_OF_RESOURCES;
1003     goto UNINSTALL_USBBUS;
1004   }
1005
1006   RootIf = AllocateZeroPool (sizeof (USB_INTERFACE));
1007
1008   if (RootIf == NULL) {
1009     FreePool (RootHub);
1010     Status = EFI_OUT_OF_RESOURCES;
1011     goto FREE_ROOTHUB;
1012   }
1013
1014   RootHub->Bus            = UsbBus;
1015   RootHub->NumOfInterface = 1;
1016   RootHub->Interfaces[0]  = RootIf;
1017   RootHub->Tier           = 0;
1018   RootIf->Signature       = USB_INTERFACE_SIGNATURE;
1019   RootIf->Device          = RootHub;
1020   RootIf->DevicePath      = UsbBus->DevicePath;
1021
1022   //
1023   // Report Status Code here since we will enumerate the USB devices
1024   //
1025   REPORT_STATUS_CODE_WITH_DEVICE_PATH (
1026     EFI_PROGRESS_CODE,
1027     (EFI_IO_BUS_USB | EFI_IOB_PC_DETECT),
1028     UsbBus->DevicePath
1029     );
1030
1031   Status                  = mUsbRootHubApi.Init (RootIf);
1032
1033   if (EFI_ERROR (Status)) {
1034     DEBUG ((EFI_D_ERROR, "UsbBusStart: Failed to init root hub %r\n", Status));
1035     goto FREE_ROOTHUB;
1036   }
1037
1038   UsbBus->Devices[0] = RootHub;
1039
1040   DEBUG ((EFI_D_INFO, "UsbBusStart: usb bus started on %p, root hub %p\n", Controller, RootIf));
1041   return EFI_SUCCESS;
1042
1043 FREE_ROOTHUB:
1044   if (RootIf != NULL) {
1045     FreePool (RootIf);
1046   }
1047   if (RootHub != NULL) {
1048     FreePool (RootHub);
1049   }
1050
1051 UNINSTALL_USBBUS:
1052   gBS->UninstallProtocolInterface (Controller, &gEfiCallerIdGuid, &UsbBus->BusId);
1053
1054 CLOSE_HC:
1055   if (UsbBus->Usb2Hc != NULL) {
1056     gBS->CloseProtocol (
1057           Controller,
1058           &gEfiUsb2HcProtocolGuid,
1059           This->DriverBindingHandle,
1060           Controller
1061           );
1062   }
1063   if (UsbBus->UsbHc != NULL) {
1064     gBS->CloseProtocol (
1065           Controller,
1066           &gEfiUsbHcProtocolGuid,
1067           This->DriverBindingHandle,
1068           Controller
1069           );
1070   }
1071   gBS->CloseProtocol (
1072          Controller,
1073          &gEfiDevicePathProtocolGuid,
1074          This->DriverBindingHandle,
1075          Controller
1076          );
1077   FreePool (UsbBus);
1078
1079   DEBUG ((EFI_D_ERROR, "UsbBusStart: Failed to start bus driver %r\n", Status));
1080   return Status;
1081 }
1082
1083
1084 /**
1085   The USB bus driver entry pointer.
1086
1087   @param ImageHandle       The driver image handle.
1088   @param SystemTable       The system table.
1089
1090   @return EFI_SUCCESS      The component name protocol is installed.
1091   @return Others           Failed to init the usb driver.
1092
1093 **/
1094 EFI_STATUS
1095 EFIAPI
1096 UsbBusDriverEntryPoint (
1097   IN EFI_HANDLE           ImageHandle,
1098   IN EFI_SYSTEM_TABLE     *SystemTable
1099   )
1100 {
1101   return EfiLibInstallDriverBindingComponentName2 (
1102            ImageHandle,
1103            SystemTable,
1104            &mUsbBusDriverBinding,
1105            ImageHandle,
1106            &mUsbBusComponentName,
1107            &mUsbBusComponentName2
1108            );
1109 }
1110
1111
1112 /**
1113   Check whether USB bus driver support this device.
1114
1115   @param  This                   The USB bus driver binding protocol.
1116   @param  Controller             The controller handle to check.
1117   @param  RemainingDevicePath    The remaining device path.
1118
1119   @retval EFI_SUCCESS            The bus supports this controller.
1120   @retval EFI_UNSUPPORTED        This device isn't supported.
1121
1122 **/
1123 EFI_STATUS
1124 EFIAPI
1125 UsbBusControllerDriverSupported (
1126   IN EFI_DRIVER_BINDING_PROTOCOL  *This,
1127   IN EFI_HANDLE                   Controller,
1128   IN EFI_DEVICE_PATH_PROTOCOL     *RemainingDevicePath
1129   )
1130 {
1131   EFI_DEV_PATH_PTR          DevicePathNode;
1132   EFI_DEVICE_PATH_PROTOCOL  *ParentDevicePath;
1133   EFI_USB2_HC_PROTOCOL      *Usb2Hc;
1134   EFI_USB_HC_PROTOCOL       *UsbHc;
1135   EFI_STATUS                Status;
1136
1137   //
1138   // Check whether device path is valid
1139   //
1140   if (RemainingDevicePath != NULL) {
1141     //
1142     // Check if RemainingDevicePath is the End of Device Path Node,
1143     // if yes, go on checking other conditions
1144     //
1145     if (!IsDevicePathEnd (RemainingDevicePath)) {
1146       //
1147       // If RemainingDevicePath isn't the End of Device Path Node,
1148       // check its validation
1149       //
1150       DevicePathNode.DevPath = RemainingDevicePath;
1151
1152       if ((DevicePathNode.DevPath->Type    != MESSAGING_DEVICE_PATH) ||
1153           (DevicePathNode.DevPath->SubType != MSG_USB_DP &&
1154            DevicePathNode.DevPath->SubType != MSG_USB_CLASS_DP
1155            && DevicePathNode.DevPath->SubType != MSG_USB_WWID_DP
1156            )) {
1157
1158         return EFI_UNSUPPORTED;
1159       }
1160     }
1161   }
1162
1163   //
1164   // Check whether USB_HC2 protocol is installed
1165   //
1166   Status = gBS->OpenProtocol (
1167                   Controller,
1168                   &gEfiUsb2HcProtocolGuid,
1169                   (VOID **) &Usb2Hc,
1170                   This->DriverBindingHandle,
1171                   Controller,
1172                   EFI_OPEN_PROTOCOL_BY_DRIVER
1173                   );
1174   if (Status == EFI_ALREADY_STARTED) {
1175     return EFI_SUCCESS;
1176   }
1177
1178   if (EFI_ERROR (Status)) {
1179     //
1180     // If failed to open USB_HC2, fall back to USB_HC
1181     //
1182     Status = gBS->OpenProtocol (
1183                     Controller,
1184                     &gEfiUsbHcProtocolGuid,
1185                     (VOID **) &UsbHc,
1186                     This->DriverBindingHandle,
1187                     Controller,
1188                     EFI_OPEN_PROTOCOL_BY_DRIVER
1189                     );
1190     if (Status == EFI_ALREADY_STARTED) {
1191       return EFI_SUCCESS;
1192     }
1193
1194     if (EFI_ERROR (Status)) {
1195       return Status;
1196     }
1197
1198     //
1199     // Close the USB_HC used to perform the supported test
1200     //
1201     gBS->CloseProtocol (
1202           Controller,
1203           &gEfiUsbHcProtocolGuid,
1204           This->DriverBindingHandle,
1205           Controller
1206           );
1207
1208   } else {
1209
1210     //
1211     // Close the USB_HC2 used to perform the supported test
1212     //
1213     gBS->CloseProtocol (
1214            Controller,
1215            &gEfiUsb2HcProtocolGuid,
1216            This->DriverBindingHandle,
1217            Controller
1218            );
1219   }
1220
1221   //
1222   // Open the EFI Device Path protocol needed to perform the supported test
1223   //
1224   Status = gBS->OpenProtocol (
1225                   Controller,
1226                   &gEfiDevicePathProtocolGuid,
1227                   (VOID **) &ParentDevicePath,
1228                   This->DriverBindingHandle,
1229                   Controller,
1230                   EFI_OPEN_PROTOCOL_BY_DRIVER
1231                   );
1232   if (Status == EFI_ALREADY_STARTED) {
1233     return EFI_SUCCESS;
1234   }
1235
1236   if (!EFI_ERROR (Status)) {
1237     //
1238     // Close protocol, don't use device path protocol in the Support() function
1239     //
1240     gBS->CloseProtocol (
1241           Controller,
1242           &gEfiDevicePathProtocolGuid,
1243           This->DriverBindingHandle,
1244           Controller
1245           );
1246
1247     return EFI_SUCCESS;
1248   }
1249
1250   return Status;
1251 }
1252
1253
1254 /**
1255   Start to process the controller.
1256
1257   @param  This                   The USB bus driver binding instance.
1258   @param  Controller             The controller to check.
1259   @param  RemainingDevicePath    The remaining device patch.
1260
1261   @retval EFI_SUCCESS            The controller is controlled by the usb bus.
1262   @retval EFI_ALREADY_STARTED    The controller is already controlled by the usb
1263                                  bus.
1264   @retval EFI_OUT_OF_RESOURCES   Failed to allocate resources.
1265
1266 **/
1267 EFI_STATUS
1268 EFIAPI
1269 UsbBusControllerDriverStart (
1270   IN EFI_DRIVER_BINDING_PROTOCOL  *This,
1271   IN EFI_HANDLE                   Controller,
1272   IN EFI_DEVICE_PATH_PROTOCOL     *RemainingDevicePath
1273   )
1274 {
1275   EFI_USB_BUS_PROTOCOL          *UsbBusId;
1276   EFI_STATUS                    Status;
1277   EFI_DEVICE_PATH_PROTOCOL      *ParentDevicePath;
1278
1279   Status = gBS->OpenProtocol (
1280                   Controller,
1281                   &gEfiDevicePathProtocolGuid,
1282                   (VOID **) &ParentDevicePath,
1283                   This->DriverBindingHandle,
1284                   Controller,
1285                   EFI_OPEN_PROTOCOL_GET_PROTOCOL
1286                   );
1287   ASSERT_EFI_ERROR (Status);
1288
1289   //
1290   // Report Status Code here since we will initialize the host controller
1291   //
1292   REPORT_STATUS_CODE_WITH_DEVICE_PATH (
1293     EFI_PROGRESS_CODE,
1294     (EFI_IO_BUS_USB | EFI_IOB_PC_INIT),
1295     ParentDevicePath
1296     );
1297
1298   //
1299   // Locate the USB bus protocol, if it is found, USB bus
1300   // is already started on this controller.
1301   //
1302   Status = gBS->OpenProtocol (
1303                   Controller,
1304                   &gEfiCallerIdGuid,
1305                   (VOID **) &UsbBusId,
1306                   This->DriverBindingHandle,
1307                   Controller,
1308                   EFI_OPEN_PROTOCOL_GET_PROTOCOL
1309                   );
1310
1311   if (EFI_ERROR (Status)) {
1312     //
1313     // If first start, build the bus execute environment and install bus protocol
1314     //
1315     REPORT_STATUS_CODE (EFI_PROGRESS_CODE, (EFI_IO_BUS_USB | EFI_P_PC_ENABLE));
1316     Status = UsbBusBuildProtocol (This, Controller, RemainingDevicePath);
1317     if (EFI_ERROR (Status)) {
1318       return Status;
1319     }
1320     //
1321     // Try get the Usb Bus protocol interface again
1322     //
1323     Status = gBS->OpenProtocol (
1324                     Controller,
1325                     &gEfiCallerIdGuid,
1326                     (VOID **) &UsbBusId,
1327                     This->DriverBindingHandle,
1328                     Controller,
1329                     EFI_OPEN_PROTOCOL_GET_PROTOCOL
1330                     );
1331     ASSERT (!EFI_ERROR (Status));
1332   } else {
1333     //
1334     // USB Bus driver need to control the recursive connect policy of the bus, only those wanted
1335     // usb child device will be recursively connected.
1336     // The RemainingDevicePath indicate the child usb device which user want to fully recursively connecte this time.
1337     // All wanted usb child devices will be remembered by the usb bus driver itself.
1338     // If RemainingDevicePath == NULL, all the usb child devices in the usb bus are wanted devices.
1339     //
1340     // Save the passed in RemainingDevicePath this time
1341     //
1342     if (RemainingDevicePath != NULL) {
1343       if (IsDevicePathEnd (RemainingDevicePath)) {
1344         //
1345         // If RemainingDevicePath is the End of Device Path Node,
1346         // skip enumerate any device and return EFI_SUCESSS
1347         //
1348         return EFI_SUCCESS;
1349       }
1350     }
1351
1352     Status = UsbBusAddWantedUsbIoDP (UsbBusId, RemainingDevicePath);
1353     ASSERT (!EFI_ERROR (Status));
1354     //
1355     // Ensure all wanted child usb devices are fully recursively connected
1356     //
1357     Status = UsbBusRecursivelyConnectWantedUsbIo (UsbBusId);
1358     ASSERT (!EFI_ERROR (Status));
1359   }
1360
1361
1362   return EFI_SUCCESS;
1363 }
1364
1365
1366 /**
1367   Stop handle the controller by this USB bus driver.
1368
1369   @param  This                   The USB bus driver binding protocol.
1370   @param  Controller             The controller to release.
1371   @param  NumberOfChildren       The child of USB bus that opened controller
1372                                  BY_CHILD.
1373   @param  ChildHandleBuffer      The array of child handle.
1374
1375   @retval EFI_SUCCESS            The controller or children are stopped.
1376   @retval EFI_DEVICE_ERROR       Failed to stop the driver.
1377
1378 **/
1379 EFI_STATUS
1380 EFIAPI
1381 UsbBusControllerDriverStop (
1382   IN EFI_DRIVER_BINDING_PROTOCOL  *This,
1383   IN EFI_HANDLE                   Controller,
1384   IN UINTN                        NumberOfChildren,
1385   IN EFI_HANDLE                   *ChildHandleBuffer
1386   )
1387 {
1388   USB_BUS               *Bus;
1389   USB_DEVICE            *RootHub;
1390   USB_DEVICE            *UsbDev;
1391   USB_INTERFACE         *RootIf;
1392   USB_INTERFACE         *UsbIf;
1393   EFI_USB_BUS_PROTOCOL  *BusId;
1394   EFI_USB_IO_PROTOCOL   *UsbIo;
1395   EFI_TPL               OldTpl;
1396   UINTN                 Index;
1397   EFI_STATUS            Status;
1398
1399   Status  = EFI_SUCCESS;
1400
1401   if (NumberOfChildren > 0) {
1402     //
1403     // BugBug: Raise TPL to callback level instead of USB_BUS_TPL to avoid TPL conflict
1404     //
1405     OldTpl   = gBS->RaiseTPL (TPL_CALLBACK);
1406
1407     for (Index = 0; Index < NumberOfChildren; Index++) {
1408       Status = gBS->OpenProtocol (
1409                       ChildHandleBuffer[Index],
1410                       &gEfiUsbIoProtocolGuid,
1411                       (VOID **) &UsbIo,
1412                       This->DriverBindingHandle,
1413                       Controller,
1414                       EFI_OPEN_PROTOCOL_GET_PROTOCOL
1415                       );
1416
1417       if (EFI_ERROR (Status)) {
1418         //
1419         // It is possible that the child has already been released:
1420         // 1. For combo device, free one device will release others.
1421         // 2. If a hub is released, all devices on its down facing
1422         //    ports are released also.
1423         //
1424         continue;
1425       }
1426
1427       UsbIf   = USB_INTERFACE_FROM_USBIO (UsbIo);
1428       UsbDev  = UsbIf->Device;
1429
1430       UsbRemoveDevice (UsbDev);
1431     }
1432
1433     gBS->RestoreTPL (OldTpl);
1434     return EFI_SUCCESS;
1435   }
1436
1437   DEBUG (( EFI_D_INFO, "UsbBusStop: usb bus stopped on %p\n", Controller));
1438
1439   //
1440   // Locate USB_BUS for the current host controller
1441   //
1442   Status = gBS->OpenProtocol (
1443                   Controller,
1444                   &gEfiCallerIdGuid,
1445                   (VOID **) &BusId,
1446                   This->DriverBindingHandle,
1447                   Controller,
1448                   EFI_OPEN_PROTOCOL_GET_PROTOCOL
1449                   );
1450
1451   if (EFI_ERROR (Status)) {
1452     return Status;
1453   }
1454
1455   Bus = USB_BUS_FROM_THIS (BusId);
1456
1457   //
1458   // Stop the root hub, then free all the devices
1459   //
1460   // BugBug: Raise TPL to callback level instead of USB_BUS_TPL to avoid TPL conflict
1461   //
1462   OldTpl  = gBS->RaiseTPL (TPL_CALLBACK);
1463
1464   RootHub = Bus->Devices[0];
1465   RootIf  = RootHub->Interfaces[0];
1466
1467   mUsbRootHubApi.Release (RootIf);
1468
1469   ASSERT (Bus->MaxDevices <= 256);
1470   for (Index = 1; Index < Bus->MaxDevices; Index++) {
1471     if (Bus->Devices[Index] != NULL) {
1472       UsbRemoveDevice (Bus->Devices[Index]);
1473     }
1474   }
1475
1476   gBS->RestoreTPL (OldTpl);
1477
1478   gBS->FreePool   (RootIf);
1479   gBS->FreePool   (RootHub);
1480   Status = UsbBusFreeUsbDPList (&Bus->WantedUsbIoDPList);
1481   ASSERT (!EFI_ERROR (Status));
1482
1483   //
1484   // Uninstall the bus identifier and close USB_HC/USB2_HC protocols
1485   //
1486   gBS->UninstallProtocolInterface (Controller, &gEfiCallerIdGuid, &Bus->BusId);
1487
1488   if (Bus->Usb2Hc != NULL) {
1489     gBS->CloseProtocol (
1490            Controller,
1491            &gEfiUsb2HcProtocolGuid,
1492            This->DriverBindingHandle,
1493            Controller
1494            );
1495   }
1496
1497   if (Bus->UsbHc != NULL) {
1498     gBS->CloseProtocol (
1499            Controller,
1500            &gEfiUsbHcProtocolGuid,
1501            This->DriverBindingHandle,
1502            Controller
1503            );
1504   }
1505
1506   gBS->CloseProtocol (
1507          Controller,
1508          &gEfiDevicePathProtocolGuid,
1509          This->DriverBindingHandle,
1510          Controller
1511          );
1512
1513   gBS->FreePool (Bus);
1514
1515   return Status;
1516 }