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iPXE
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EFI_USB_HC_PROTOCOL as defined in EFI 1.10. More...
#include <ipxe/efi/Protocol/Usb2HostController.h>Go to the source code of this file.
Data Structures | |
| struct | _EFI_USB_HC_PROTOCOL |
| The EFI_USB_HC_PROTOCOL provides USB host controller management, basic data transactions over a USB bus, and USB root hub access. More... | |
Macros | |
| #define | EFI_USB_HC_PROTOCOL_GUID |
Typedefs | |
| typedef struct _EFI_USB_HC_PROTOCOL | EFI_USB_HC_PROTOCOL |
| Forward reference for pure ANSI compatability. More... | |
| typedef EFI_STATUS(EFIAPI * | EFI_USB_HC_PROTOCOL_RESET) (IN EFI_USB_HC_PROTOCOL *This, IN UINT16 Attributes) |
| Provides software reset for the USB host controller. More... | |
| typedef EFI_STATUS(EFIAPI * | EFI_USB_HC_PROTOCOL_GET_STATE) (IN EFI_USB_HC_PROTOCOL *This, OUT EFI_USB_HC_STATE *State) |
| Retrieves current state of the USB host controller. More... | |
| typedef EFI_STATUS(EFIAPI * | EFI_USB_HC_PROTOCOL_SET_STATE) (IN EFI_USB_HC_PROTOCOL *This, IN EFI_USB_HC_STATE State) |
| Sets the USB host controller to a specific state. More... | |
| typedef EFI_STATUS(EFIAPI * | EFI_USB_HC_PROTOCOL_CONTROL_TRANSFER) (IN EFI_USB_HC_PROTOCOL *This, IN UINT8 DeviceAddress, IN BOOLEAN IsSlowDevice, IN UINT8 MaximumPacketLength, IN EFI_USB_DEVICE_REQUEST *Request, IN EFI_USB_DATA_DIRECTION TransferDirection, IN OUT VOID *Data OPTIONAL, IN OUT UINTN *DataLength OPTIONAL, IN UINTN TimeOut, OUT UINT32 *TransferResult) |
| Submits control transfer to a target USB device. More... | |
| typedef EFI_STATUS(EFIAPI * | EFI_USB_HC_PROTOCOL_BULK_TRANSFER) (IN EFI_USB_HC_PROTOCOL *This, IN UINT8 DeviceAddress, IN UINT8 EndPointAddress, IN UINT8 MaximumPacketLength, IN OUT VOID *Data, IN OUT UINTN *DataLength, IN OUT UINT8 *DataToggle, IN UINTN TimeOut, OUT UINT32 *TransferResult) |
| Submits bulk transfer to a bulk endpoint of a USB device. More... | |
| typedef EFI_STATUS(EFIAPI * | EFI_USB_HC_PROTOCOL_ASYNC_INTERRUPT_TRANSFER) (IN EFI_USB_HC_PROTOCOL *This, IN UINT8 DeviceAddress, IN UINT8 EndPointAddress, IN BOOLEAN IsSlowDevice, IN UINT8 MaxiumPacketLength, IN BOOLEAN IsNewTransfer, IN OUT UINT8 *DataToggle, IN UINTN PollingInterval OPTIONAL, IN UINTN DataLength OPTIONAL, IN EFI_ASYNC_USB_TRANSFER_CALLBACK CallBackFunction OPTIONAL, IN VOID *Context OPTIONAL) |
| Submits an asynchronous interrupt transfer to an interrupt endpoint of a USB device. More... | |
| typedef EFI_STATUS(EFIAPI * | EFI_USB_HC_PROTOCOL_SYNC_INTERRUPT_TRANSFER) (IN EFI_USB_HC_PROTOCOL *This, IN UINT8 DeviceAddress, IN UINT8 EndPointAddress, IN BOOLEAN IsSlowDevice, IN UINT8 MaximumPacketLength, IN OUT VOID *Data, IN OUT UINTN *DataLength, IN OUT UINT8 *DataToggle, IN UINTN TimeOut, OUT UINT32 *TransferResult) |
| Submits synchronous interrupt transfer to an interrupt endpoint of a USB device. More... | |
| typedef EFI_STATUS(EFIAPI * | EFI_USB_HC_PROTOCOL_ISOCHRONOUS_TRANSFER) (IN EFI_USB_HC_PROTOCOL *This, IN UINT8 DeviceAddress, IN UINT8 EndPointAddress, IN UINT8 MaximumPacketLength, IN OUT VOID *Data, IN UINTN DataLength, OUT UINT32 *TransferResult) |
| Submits isochronous transfer to an isochronous endpoint of a USB device. More... | |
| typedef EFI_STATUS(EFIAPI * | EFI_USB_HC_PROTOCOL_ASYNC_ISOCHRONOUS_TRANSFER) (IN EFI_USB_HC_PROTOCOL *This, IN UINT8 DeviceAddress, IN UINT8 EndPointAddress, IN UINT8 MaximumPacketLength, IN OUT VOID *Data, IN UINTN DataLength, IN EFI_ASYNC_USB_TRANSFER_CALLBACK IsochronousCallBack, IN VOID *Context OPTIONAL) |
| Submits nonblocking isochronous transfer to an isochronous endpoint of a USB device. More... | |
| typedef EFI_STATUS(EFIAPI * | EFI_USB_HC_PROTOCOL_GET_ROOTHUB_PORT_NUMBER) (IN EFI_USB_HC_PROTOCOL *This, OUT UINT8 *PortNumber) |
| Retrieves the number of root hub ports. More... | |
| typedef EFI_STATUS(EFIAPI * | EFI_USB_HC_PROTOCOL_GET_ROOTHUB_PORT_STATUS) (IN EFI_USB_HC_PROTOCOL *This, IN UINT8 PortNumber, OUT EFI_USB_PORT_STATUS *PortStatus) |
| Retrieves the current status of a USB root hub port. More... | |
| typedef EFI_STATUS(EFIAPI * | EFI_USB_HC_PROTOCOL_SET_ROOTHUB_PORT_FEATURE) (IN EFI_USB_HC_PROTOCOL *This, IN UINT8 PortNumber, IN EFI_USB_PORT_FEATURE PortFeature) |
| Sets a feature for the specified root hub port. More... | |
| typedef EFI_STATUS(EFIAPI * | EFI_USB_HC_PROTOCOL_CLEAR_ROOTHUB_PORT_FEATURE) (IN EFI_USB_HC_PROTOCOL *This, IN UINT8 PortNumber, IN EFI_USB_PORT_FEATURE PortFeature) |
| Clears a feature for the specified root hub port. More... | |
Functions | |
| FILE_LICENCE (BSD2_PATENT) | |
Variables | |
| EFI_GUID | gEfiUsbHcProtocolGuid |
EFI_USB_HC_PROTOCOL as defined in EFI 1.10.
The USB Host Controller Protocol is used by code, typically USB bus drivers, running in the EFI boot services environment, to perform data transactions over a USB bus. In addition, it provides an abstraction for the root hub of the USB bus.
Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.
SPDX-License-Identifier: BSD-2-Clause-Patent
Definition in file UsbHostController.h.
| #define EFI_USB_HC_PROTOCOL_GUID |
Definition at line 20 of file UsbHostController.h.
| typedef struct _EFI_USB_HC_PROTOCOL EFI_USB_HC_PROTOCOL |
Forward reference for pure ANSI compatability.
Definition at line 28 of file UsbHostController.h.
| typedef EFI_STATUS(EFIAPI * EFI_USB_HC_PROTOCOL_RESET) (IN EFI_USB_HC_PROTOCOL *This, IN UINT16 Attributes) |
Provides software reset for the USB host controller.
| This | A pointer to the EFI_USB_HC_PROTOCOL instance. |
| Attributes | A bit mask of the reset operation to perform. |
| EFI_SUCCESS | The reset operation succeeded. |
| EFI_UNSUPPORTED | The type of reset specified by Attributes is not currently supported by the host controller hardware. |
| EFI_INVALID_PARAMETER | Attributes is not valid. |
| EFI_DEVICE_ERROR | An error was encountered while attempting to perform the reset operation. |
Definition at line 49 of file UsbHostController.h.
| typedef EFI_STATUS(EFIAPI * EFI_USB_HC_PROTOCOL_GET_STATE) (IN EFI_USB_HC_PROTOCOL *This, OUT EFI_USB_HC_STATE *State) |
Retrieves current state of the USB host controller.
| This | A pointer to the EFI_USB_HC_PROTOCOL instance. |
| State | A pointer to the EFI_USB_HC_STATE data structure that indicates current state of the USB host controller. |
| EFI_SUCCESS | The state information of the host controller was returned in State. |
| EFI_INVALID_PARAMETER | State is NULL. |
| EFI_DEVICE_ERROR | An error was encountered while attempting to retrieve the host controller's current state. |
Definition at line 69 of file UsbHostController.h.
| typedef EFI_STATUS(EFIAPI * EFI_USB_HC_PROTOCOL_SET_STATE) (IN EFI_USB_HC_PROTOCOL *This, IN EFI_USB_HC_STATE State) |
Sets the USB host controller to a specific state.
| This | A pointer to the EFI_USB_HC_PROTOCOL instance. |
| State | Indicates the state of the host controller that will be set. |
| EFI_SUCCESS | The USB host controller was successfully placed in the state specified by State. |
| EFI_INVALID_PARAMETER | State is NULL. |
| EFI_DEVICE_ERROR | Failed to set the state specified by State due to device error. |
Definition at line 88 of file UsbHostController.h.
| typedef EFI_STATUS(EFIAPI * EFI_USB_HC_PROTOCOL_CONTROL_TRANSFER) (IN EFI_USB_HC_PROTOCOL *This, IN UINT8 DeviceAddress, IN BOOLEAN IsSlowDevice, IN UINT8 MaximumPacketLength, IN EFI_USB_DEVICE_REQUEST *Request, IN EFI_USB_DATA_DIRECTION TransferDirection, IN OUT VOID *Data OPTIONAL, IN OUT UINTN *DataLength OPTIONAL, IN UINTN TimeOut, OUT UINT32 *TransferResult) |
Submits control transfer to a target USB device.
| This | A pointer to the EFI_USB_HC_PROTOCOL instance. |
| DeviceAddress | Represents the address of the target device on the USB, which is assigned during USB enumeration. |
| IsSlowDevice | Indicates whether the target device is slow device or full-speed device. |
| MaximumPacketLength | Indicates the maximum packet size that the default control transfer endpoint is capable of sending or receiving. |
| Request | A pointer to the USB device request that will be sent to the USB device. |
| TransferDirection | Specifies the data direction for the transfer. There are three values available, EfiUsbDataIn, EfiUsbDataOut and EfiUsbNoData. |
| Data | A pointer to the buffer of data that will be transmitted to USB device or received from USB device. |
| DataLength | On input, indicates the size, in bytes, of the data buffer specified by Data. On output, indicates the amount of data actually transferred. |
| TimeOut | Indicates the maximum time, in milliseconds, which the transfer is allowed to complete. |
| TransferResult | A pointer to the detailed result information generated by this control transfer. |
| EFI_SUCCESS | The control transfer was completed successfully. |
| EFI_OUT_OF_RESOURCES | The control transfer could not be completed due to a lack of resources. |
| EFI_INVALID_PARAMETER | Some parameters are invalid. |
| EFI_TIMEOUT | The control transfer failed due to timeout. |
| EFI_DEVICE_ERROR | The control transfer failed due to host controller or device error. |
Definition at line 126 of file UsbHostController.h.
| typedef EFI_STATUS(EFIAPI * EFI_USB_HC_PROTOCOL_BULK_TRANSFER) (IN EFI_USB_HC_PROTOCOL *This, IN UINT8 DeviceAddress, IN UINT8 EndPointAddress, IN UINT8 MaximumPacketLength, IN OUT VOID *Data, IN OUT UINTN *DataLength, IN OUT UINT8 *DataToggle, IN UINTN TimeOut, OUT UINT32 *TransferResult) |
Submits bulk transfer to a bulk endpoint of a USB device.
| This | A pointer to the EFI_USB_HC_PROTOCOL instance. |
| DeviceAddress | Represents the address of the target device on the USB, which is assigned during USB enumeration. |
| EndPointAddress | The combination of an endpoint number and an endpoint direction of the target USB device. Each endpoint address supports data transfer in one direction except the control endpoint (whose default endpoint address is 0). It is the caller's responsibility to make sure that the EndPointAddress represents a bulk endpoint. |
| MaximumPacketLength | Indicates the maximum packet size that the default control transfer endpoint is capable of sending or receiving. |
| Data | A pointer to the buffer of data that will be transmitted to USB device or received from USB device. |
| DataLength | On input, indicates the size, in bytes, of the data buffer specified by Data. On output, indicates the amount of data actually transferred. |
| DataToggle | A pointer to the data toggle value. |
| TimeOut | Indicates the maximum time, in milliseconds, which the transfer is allowed to complete. |
| TransferResult | A pointer to the detailed result information of the bulk transfer. |
| EFI_SUCCESS | The bulk transfer was completed successfully. |
| EFI_OUT_OF_RESOURCES | The bulk transfer could not be completed due to a lack of resources. |
| EFI_INVALID_PARAMETER | Some parameters are invalid. |
| EFI_TIMEOUT | The bulk transfer failed due to timeout. |
| EFI_DEVICE_ERROR | The bulk transfer failed due to host controller or device error. |
Definition at line 172 of file UsbHostController.h.
| typedef EFI_STATUS(EFIAPI * EFI_USB_HC_PROTOCOL_ASYNC_INTERRUPT_TRANSFER) (IN EFI_USB_HC_PROTOCOL *This, IN UINT8 DeviceAddress, IN UINT8 EndPointAddress, IN BOOLEAN IsSlowDevice, IN UINT8 MaxiumPacketLength, IN BOOLEAN IsNewTransfer, IN OUT UINT8 *DataToggle, IN UINTN PollingInterval OPTIONAL, IN UINTN DataLength OPTIONAL, IN EFI_ASYNC_USB_TRANSFER_CALLBACK CallBackFunction OPTIONAL, IN VOID *Context OPTIONAL) |
Submits an asynchronous interrupt transfer to an interrupt endpoint of a USB device.
| This | A pointer to the EFI_USB_HC_PROTOCOL instance. |
| DeviceAddress | Represents the address of the target device on the USB, which is assigned during USB enumeration. |
| EndPointAddress | The combination of an endpoint number and an endpoint direction of the target USB device. Each endpoint address supports data transfer in one direction except the control endpoint (whose default endpoint address is zero). It is the caller's responsibility to make sure that the EndPointAddress represents an interrupt endpoint. |
| IsSlowDevice | Indicates whether the target device is slow device or full-speed device. |
| MaximumPacketLength | Indicates the maximum packet size that the default control transfer endpoint is capable of sending or receiving. |
| IsNewTransfer | If TRUE, an asynchronous interrupt pipe is built between the host and the target interrupt endpoint. If FALSE, the specified asynchronous interrupt pipe is canceled. If TRUE, and an interrupt transfer exists for the target end point, then EFI_INVALID_PARAMETER is returned. |
| DataToggle | A pointer to the data toggle value. On input, it is valid when IsNewTransfer is TRUE, and it indicates the initial data toggle value the asynchronous interrupt transfer should adopt. On output, it is valid when IsNewTransfer is FALSE, and it is updated to indicate the data toggle value of the subsequent asynchronous interrupt transfer. |
| PollingInterval | Indicates the interval, in milliseconds, that the asynchronous interrupt transfer is polled. |
| DataLength | Indicates the length of data to be received at the rate specified by PollingInterval from the target asynchronous interrupt endpoint. This parameter is only required when IsNewTransfer is TRUE. |
| CallBackFunction | The Callback function. This function is called at the rate specified by PollingInterval. This parameter is only required when IsNewTransfer is TRUE. |
| Context | The context that is passed to the CallBackFunction. |
| EFI_SUCCESS | The asynchronous interrupt transfer request has been successfully submitted or canceled. |
| EFI_OUT_OF_RESOURCES | The request could not be completed due to a lack of resources. |
| EFI_INVALID_PARAMETER | Some parameters are invalid. |
| EFI_TIMEOUT | The bulk transfer failed due to timeout. |
| EFI_DEVICE_ERROR | The bulk transfer failed due to host controller or device error. |
Definition at line 228 of file UsbHostController.h.
| typedef EFI_STATUS(EFIAPI * EFI_USB_HC_PROTOCOL_SYNC_INTERRUPT_TRANSFER) (IN EFI_USB_HC_PROTOCOL *This, IN UINT8 DeviceAddress, IN UINT8 EndPointAddress, IN BOOLEAN IsSlowDevice, IN UINT8 MaximumPacketLength, IN OUT VOID *Data, IN OUT UINTN *DataLength, IN OUT UINT8 *DataToggle, IN UINTN TimeOut, OUT UINT32 *TransferResult) |
Submits synchronous interrupt transfer to an interrupt endpoint of a USB device.
| This | A pointer to the EFI_USB_HC_PROTOCOL instance. |
| DeviceAddress | Represents the address of the target device on the USB, which is assigned during USB enumeration. |
| EndPointAddress | The combination of an endpoint number and an endpoint direction of the target USB device. Each endpoint address supports data transfer in one direction except the control endpoint (whose default endpoint address is zero). It is the caller's responsibility to make sure that the EndPointAddress represents an interrupt endpoint. |
| IsSlowDevice | Indicates whether the target device is slow device or full-speed device. |
| MaximumPacketLength | Indicates the maximum packet size that the default control transfer endpoint is capable of sending or receiving. |
| Data | A pointer to the buffer of data that will be transmitted to USB device or received from USB device. asynchronous interrupt pipe is canceled. |
| DataLength | On input, the size, in bytes, of the data buffer specified by Data. On output, the number of bytes transferred. |
| DataToggle | A pointer to the data toggle value. On input, it indicates the initial data toggle value the synchronous interrupt transfer should adopt; on output, it is updated to indicate the data toggle value of the subsequent synchronous interrupt transfer. |
| TimeOut | Indicates the maximum time, in milliseconds, which the transfer is allowed to complete. |
| TransferResult | A pointer to the detailed result information from the synchronous interrupt transfer. |
| EFI_SUCCESS | The synchronous interrupt transfer was completed successfully. |
| EFI_OUT_OF_RESOURCES | The request could not be completed due to a lack of resources. |
| EFI_INVALID_PARAMETER | Some parameters are invalid. |
| EFI_TIMEOUT | The synchronous interrupt transfer failed due to timeout. |
| EFI_DEVICE_ERROR | The synchronous interrupt transfer failed due to host controller or device error. |
Definition at line 280 of file UsbHostController.h.
| typedef EFI_STATUS(EFIAPI * EFI_USB_HC_PROTOCOL_ISOCHRONOUS_TRANSFER) (IN EFI_USB_HC_PROTOCOL *This, IN UINT8 DeviceAddress, IN UINT8 EndPointAddress, IN UINT8 MaximumPacketLength, IN OUT VOID *Data, IN UINTN DataLength, OUT UINT32 *TransferResult) |
Submits isochronous transfer to an isochronous endpoint of a USB device.
| This | A pointer to the EFI_USB_HC_PROTOCOL instance. |
| DeviceAddress | Represents the address of the target device on the USB, which is assigned during USB enumeration. |
| EndPointAddress | The combination of an endpoint number and an endpoint direction of the target USB device. Each endpoint address supports data transfer in one direction except the control endpoint (whose default endpoint address is 0). It is the caller's responsibility to make sure that the EndPointAddress represents an isochronous endpoint. |
| MaximumPacketLength | Indicates the maximum packet size that the default control transfer endpoint is capable of sending or receiving. |
| Data | A pointer to the buffer of data that will be transmitted to USB device or received from USB device. asynchronous interrupt pipe is canceled. |
| DataLength | Specifies the length, in bytes, of the data to be sent to or received from the USB device. |
| TransferResult | A pointer to the detailed result information from the isochronous transfer. |
| EFI_SUCCESS | The isochronous transfer was completed successfully. |
| EFI_OUT_OF_RESOURCES | The isochronous could not be completed due to a lack of resources. |
| EFI_INVALID_PARAMETER | Some parameters are invalid. |
| EFI_TIMEOUT | The isochronous transfer failed due to timeout. |
| EFI_DEVICE_ERROR | The isochronous transfer failed due to host controller or device error. |
Definition at line 323 of file UsbHostController.h.
| typedef EFI_STATUS(EFIAPI * EFI_USB_HC_PROTOCOL_ASYNC_ISOCHRONOUS_TRANSFER) (IN EFI_USB_HC_PROTOCOL *This, IN UINT8 DeviceAddress, IN UINT8 EndPointAddress, IN UINT8 MaximumPacketLength, IN OUT VOID *Data, IN UINTN DataLength, IN EFI_ASYNC_USB_TRANSFER_CALLBACK IsochronousCallBack, IN VOID *Context OPTIONAL) |
Submits nonblocking isochronous transfer to an isochronous endpoint of a USB device.
| This | A pointer to the EFI_USB_HC_PROTOCOL instance. |
| DeviceAddress | Represents the address of the target device on the USB, which is assigned during USB enumeration. |
| EndPointAddress | The combination of an endpoint number and an endpoint direction of the target USB device. Each endpoint address supports data transfer in one direction except the control endpoint (whose default endpoint address is zero). It is the caller's responsibility to make sure that the EndPointAddress represents an isochronous endpoint. |
| MaximumPacketLength | Indicates the maximum packet size that the default control transfer endpoint is capable of sending or receiving. For isochronous endpoints, this value is used to reserve the bus time in the schedule, required for the perframe data payloads. The pipe may, on an ongoing basis, actually use less bandwidth than that reserved. |
| Data | A pointer to the buffer of data that will be transmitted to USB device or received from USB device. asynchronous interrupt pipe is canceled. |
| DataLength | Specifies the length, in bytes, of the data to be sent to or received from the USB device. |
| IsochronousCallback | The Callback function.This function is called if the requested isochronous transfer is completed. |
| Context | Data passed to the IsochronousCallback function. This is an optional parameter and may be NULL. |
| EFI_SUCCESS | The asynchronous isochronous transfer was completed successfully. |
| EFI_OUT_OF_RESOURCES | The asynchronous isochronous could not be completed due to a lack of resources. |
| EFI_INVALID_PARAMETER | Some parameters are invalid. |
Definition at line 366 of file UsbHostController.h.
| typedef EFI_STATUS(EFIAPI * EFI_USB_HC_PROTOCOL_GET_ROOTHUB_PORT_NUMBER) (IN EFI_USB_HC_PROTOCOL *This, OUT UINT8 *PortNumber) |
Retrieves the number of root hub ports.
| This | A pointer to the EFI_USB_HC_PROTOCOL instance. |
| PortNumber | A pointer to the number of the root hub ports. |
| EFI_SUCCESS | The port number was retrieved successfully. |
| EFI_DEVICE_ERROR | An error was encountered while attempting to retrieve the port number. |
| EFI_INVALID_PARAMETER | PortNumber is NULL. |
Definition at line 390 of file UsbHostController.h.
| typedef EFI_STATUS(EFIAPI * EFI_USB_HC_PROTOCOL_GET_ROOTHUB_PORT_STATUS) (IN EFI_USB_HC_PROTOCOL *This, IN UINT8 PortNumber, OUT EFI_USB_PORT_STATUS *PortStatus) |
Retrieves the current status of a USB root hub port.
| This | A pointer to the EFI_USB_HC_PROTOCOL instance. |
| PortNumber | Specifies the root hub port from which the status is to be retrieved. This value is zero based. For example, if a root hub has two ports, then the first port is numbered 0, and the second port is numbered 1. |
| PortStatus | A pointer to the current port status bits and port status change bits. |
| EFI_SUCCESS | The status of the USB root hub port specified by PortNumber was returned in PortStatus. |
| EFI_INVALID_PARAMETER | PortNumber is invalid. |
Definition at line 412 of file UsbHostController.h.
| typedef EFI_STATUS(EFIAPI * EFI_USB_HC_PROTOCOL_SET_ROOTHUB_PORT_FEATURE) (IN EFI_USB_HC_PROTOCOL *This, IN UINT8 PortNumber, IN EFI_USB_PORT_FEATURE PortFeature) |
Sets a feature for the specified root hub port.
| This | A pointer to the EFI_USB_HC_PROTOCOL instance. |
| PortNumber | Specifies the root hub port from which the status is to be retrieved. This value is zero based. For example, if a root hub has two ports, then the first port is numbered 0, and the second port is numbered 1. |
| PortFeature | Indicates the feature selector associated with the feature set request. |
| EFI_SUCCESS | The feature specified by PortFeature was set for the USB root hub port specified by PortNumber. |
| EFI_INVALID_PARAMETER | PortNumber is invalid or PortFeature is invalid for this function. |
Definition at line 436 of file UsbHostController.h.
| typedef EFI_STATUS(EFIAPI * EFI_USB_HC_PROTOCOL_CLEAR_ROOTHUB_PORT_FEATURE) (IN EFI_USB_HC_PROTOCOL *This, IN UINT8 PortNumber, IN EFI_USB_PORT_FEATURE PortFeature) |
Clears a feature for the specified root hub port.
| This | A pointer to the EFI_USB_HC_PROTOCOL instance. |
| PortNumber | Specifies the root hub port from which the status is to be retrieved. This value is zero based. For example, if a root hub has two ports, then the first port is numbered 0, and the second port is numbered 1. |
| PortFeature | Indicates the feature selector associated with the feature clear request. |
| EFI_SUCCESS | The feature specified by PortFeature was cleared for the USB root hub port specified by PortNumber. |
| EFI_INVALID_PARAMETER | PortNumber is invalid or PortFeature is invalid for this function. |
Definition at line 460 of file UsbHostController.h.
| FILE_LICENCE | ( | BSD2_PATENT | ) |
| EFI_GUID gEfiUsbHcProtocolGuid |
1.8.15