Data Structures
struct	EFI_USB_INTERFACE_INFO

struct	EFI_USB_CONFIG_INFO

struct	EFI_USB_DEVICE_INFO

struct	_EFI_USBFN_TRANSFER_RESULT

union	_EFI_USBFN_MESSAGE_PAYLOAD

struct	_EFI_USBFN_IO_PROTOCOL

Macros
#define	EFI_USBFN_IO_PROTOCOL_GUID

#define	EFI_USBFN_IO_PROTOCOL_REVISION 0x00010001

Typedefs
typedef struct _EFI_USBFN_IO_PROTOCOL	EFI_USBFN_IO_PROTOCOL

typedef enum _EFI_USBFN_PORT_TYPE	EFI_USBFN_PORT_TYPE

typedef enum _EFI_USB_ENDPOINT_TYPE	EFI_USB_ENDPOINT_TYPE

typedef enum _EFI_USBFN_DEVICE_INFO_ID	EFI_USBFN_DEVICE_INFO_ID

typedef enum _EFI_USBFN_ENDPOINT_DIRECTION	EFI_USBFN_ENDPOINT_DIRECTION

typedef enum _EFI_USBFN_MESSAGE	EFI_USBFN_MESSAGE

typedef enum _EFI_USBFN_TRANSFER_STATUS	EFI_USBFN_TRANSFER_STATUS

typedef struct _EFI_USBFN_TRANSFER_RESULT	EFI_USBFN_TRANSFER_RESULT

typedef enum _EFI_USB_BUS_SPEED	EFI_USB_BUS_SPEED

typedef union _EFI_USBFN_MESSAGE_PAYLOAD	EFI_USBFN_MESSAGE_PAYLOAD

typedef enum _EFI_USBFN_POLICY_TYPE	EFI_USBFN_POLICY_TYPE

typedef OUT EFI_USBFN_PORT_TYPE *	PortType

typedef OUT EFI_USB_DEVICE_INFO *	DeviceInfo

typedef IN EFI_USB_ENDPOINT_TYPE	EndpointType

typedef IN EFI_USB_ENDPOINT_TYPE IN EFI_USB_BUS_SPEED	BusSpeed

typedef IN EFI_USB_ENDPOINT_TYPE IN EFI_USB_BUS_SPEED OUT UINT16 *	MaxPacketSize

typedef IN EFI_USBFN_DEVICE_INFO_ID	Id

typedef IN EFI_USBFN_DEVICE_INFO_ID IN OUT UINTN *	BufferSize

typedef IN EFI_USBFN_DEVICE_INFO_ID IN OUT UINTN OUT VOID *	Buffer

typedef OUT UINT16 *	Vid

typedef OUT UINT16 OUT UINT16 *	Pid

typedef IN UINT8	EndpointIndex

typedef IN UINT8 IN EFI_USBFN_ENDPOINT_DIRECTION	Direction

typedef IN UINT8 IN EFI_USBFN_ENDPOINT_DIRECTION IN OUT BOOLEAN *	State

typedef OUT EFI_USBFN_MESSAGE *	Message

typedef OUT EFI_USBFN_MESSAGE IN OUT UINTN *	PayloadSize

typedef OUT EFI_USBFN_MESSAGE IN OUT UINTN OUT EFI_USBFN_MESSAGE_PAYLOAD *	Payload

typedef OUT UINTN *	MaxTransferSize

typedef IN UINTN	Size

typedef IN UINT8 IN EFI_USBFN_ENDPOINT_DIRECTION IN EFI_USBFN_POLICY_TYPE	PolicyType

Enumerations
enum	_EFI_USBFN_PORT_TYPE { EfiUsbUnknownPort = 0, EfiUsbStandardDownstreamPort, EfiUsbChargingDownstreamPort, EfiUsbDedicatedChargingPort, EfiUsbInvalidDedicatedChargingPort }

enum	_EFI_USB_ENDPOINT_TYPE { UsbEndpointControl = 0x00, UsbEndpointBulk = 0x02 }

enum	_EFI_USBFN_DEVICE_INFO_ID { EfiUsbDeviceInfoUnknown = 0, EfiUsbDeviceInfoSerialNumber, EfiUsbDeviceInfoManufacturerName, EfiUsbDeviceInfoProductName }

enum	_EFI_USBFN_ENDPOINT_DIRECTION { EfiUsbEndpointDirectionHostOut = 0, EfiUsbEndpointDirectionHostIn, EfiUsbEndpointDirectionDeviceTx = EfiUsbEndpointDirectionHostIn, EfiUsbEndpointDirectionDeviceRx = EfiUsbEndpointDirectionHostOut }

enum	_EFI_USBFN_MESSAGE { EfiUsbMsgNone = 0, EfiUsbMsgSetupPacket, EfiUsbMsgEndpointStatusChangedRx, EfiUsbMsgEndpointStatusChangedTx, EfiUsbMsgBusEventDetach, EfiUsbMsgBusEventAttach, EfiUsbMsgBusEventReset, EfiUsbMsgBusEventSuspend, EfiUsbMsgBusEventResume, EfiUsbMsgBusEventSpeed }

enum	_EFI_USBFN_TRANSFER_STATUS { UsbTransferStatusUnknown = 0, UsbTransferStatusComplete, UsbTransferStatusAborted, UsbTransferStatusActive, UsbTransferStatusNone }

enum	_EFI_USB_BUS_SPEED { UsbBusSpeedUnknown = 0, UsbBusSpeedLow, UsbBusSpeedFull, UsbBusSpeedHigh, UsbBusSpeedSuper, UsbBusSpeedMaximum = UsbBusSpeedSuper }

enum	_EFI_USBFN_POLICY_TYPE { EfiUsbPolicyUndefined = 0, EfiUsbPolicyMaxTransactionSize, EfiUsbPolicyZeroLengthTerminationSupport, EfiUsbPolicyZeroLengthTermination }

Functions
typedef	EFI_STATUS (EFIAPI EFI_USBFN_IO_DETECT_PORT)(IN EFI_USBFN_IO_PROTOCOL This

Variables
EFI_GUID	gEfiUsbFunctionIoProtocolGuid

Detailed Description

The USB Function Protocol provides an I/O abstraction for a USB Controller operating in Function mode (also commonly referred to as Device, Peripheral, or Target mode) and the mechanisms by which the USB Function can communicate with the USB Host. It is used by other UEFI drivers or applications to perform data transactions and basic USB controller management over a USB Function port.

This simple protocol only supports USB 2.0 bulk transfers on systems with a single configuration and a single interface. It does not support isochronous or interrupt transfers, alternate interfaces, or USB 3.0 functionality. Future revisions of this protocol may support these or additional features.

Copyright (c) 2015 - 2018, Intel Corporation. All rights reserved.
SPDX-License-Identifier: BSD-2-Clause-Patent

Revision Reference:: This Protocol was introduced in UEFI Specification 2.5.

Macro Definition Documentation

#define EFI_USBFN_IO_PROTOCOL_GUID

Value:

{ \
      0x32d2963a, 0xfe5d, 0x4f30, {0xb6, 0x33, 0x6e, 0x5d, 0xc5, 0x58, 0x3, 0xcc} \
    }

#define EFI_USBFN_IO_PROTOCOL_REVISION 0x00010001

Typedef Documentation

typedef IN UINT8 IN EFI_USBFN_ENDPOINT_DIRECTION IN EFI_USBFN_POLICY_TYPE IN OUT UINTN IN OUT VOID* Buffer

typedef IN UINT8 IN EFI_USBFN_ENDPOINT_DIRECTION IN EFI_USBFN_POLICY_TYPE IN OUT UINTN* BufferSize

typedef IN EFI_USB_ENDPOINT_TYPE IN EFI_USB_BUS_SPEED BusSpeed

typedef OUT EFI_USB_DEVICE_INFO* DeviceInfo

typedef IN UINT8 IN EFI_USBFN_ENDPOINT_DIRECTION Direction

typedef enum _EFI_USB_BUS_SPEED EFI_USB_BUS_SPEED

typedef enum _EFI_USB_ENDPOINT_TYPE EFI_USB_ENDPOINT_TYPE

typedef enum _EFI_USBFN_DEVICE_INFO_ID EFI_USBFN_DEVICE_INFO_ID

typedef enum _EFI_USBFN_ENDPOINT_DIRECTION EFI_USBFN_ENDPOINT_DIRECTION

typedef struct _EFI_USBFN_IO_PROTOCOL EFI_USBFN_IO_PROTOCOL

typedef enum _EFI_USBFN_MESSAGE EFI_USBFN_MESSAGE

typedef union _EFI_USBFN_MESSAGE_PAYLOAD EFI_USBFN_MESSAGE_PAYLOAD

typedef enum _EFI_USBFN_POLICY_TYPE EFI_USBFN_POLICY_TYPE

typedef enum _EFI_USBFN_PORT_TYPE EFI_USBFN_PORT_TYPE

typedef struct _EFI_USBFN_TRANSFER_RESULT EFI_USBFN_TRANSFER_RESULT

typedef enum _EFI_USBFN_TRANSFER_STATUS EFI_USBFN_TRANSFER_STATUS

typedef IN UINT8 EndpointIndex

typedef IN EFI_USB_ENDPOINT_TYPE EndpointType

typedef IN EFI_USBFN_DEVICE_INFO_ID Id

typedef IN EFI_USB_ENDPOINT_TYPE IN EFI_USB_BUS_SPEED OUT UINT16* MaxPacketSize

typedef OUT UINTN* MaxTransferSize

typedef OUT EFI_USBFN_MESSAGE* Message

typedef OUT EFI_USBFN_MESSAGE IN OUT UINTN OUT EFI_USBFN_MESSAGE_PAYLOAD* Payload

typedef OUT EFI_USBFN_MESSAGE IN OUT UINTN* PayloadSize

typedef OUT UINT16 OUT UINT16* Pid

typedef IN UINT8 IN EFI_USBFN_ENDPOINT_DIRECTION IN EFI_USBFN_POLICY_TYPE PolicyType

typedef OUT EFI_USBFN_PORT_TYPE* PortType

typedef IN UINTN Size

typedef IN UINT8 IN EFI_USBFN_ENDPOINT_DIRECTION IN OUT BOOLEAN * State

typedef OUT UINT16* Vid

Enumeration Type Documentation

enum _EFI_USB_BUS_SPEED

Enumerator
UsbBusSpeedUnknown
UsbBusSpeedLow
UsbBusSpeedFull
UsbBusSpeedHigh
UsbBusSpeedSuper
UsbBusSpeedMaximum

enum _EFI_USB_ENDPOINT_TYPE

Enumerator
UsbEndpointControl
UsbEndpointBulk

enum _EFI_USBFN_DEVICE_INFO_ID

Enumerator
EfiUsbDeviceInfoUnknown
EfiUsbDeviceInfoSerialNumber
EfiUsbDeviceInfoManufacturerName
EfiUsbDeviceInfoProductName

enum _EFI_USBFN_ENDPOINT_DIRECTION

Enumerator
EfiUsbEndpointDirectionHostOut
EfiUsbEndpointDirectionHostIn
EfiUsbEndpointDirectionDeviceTx
EfiUsbEndpointDirectionDeviceRx

enum _EFI_USBFN_MESSAGE

Enumerator
EfiUsbMsgNone
EfiUsbMsgSetupPacket
EfiUsbMsgEndpointStatusChangedRx
EfiUsbMsgEndpointStatusChangedTx
EfiUsbMsgBusEventDetach
EfiUsbMsgBusEventAttach
EfiUsbMsgBusEventReset
EfiUsbMsgBusEventSuspend
EfiUsbMsgBusEventResume
EfiUsbMsgBusEventSpeed

enum _EFI_USBFN_POLICY_TYPE

Enumerator
EfiUsbPolicyUndefined
EfiUsbPolicyMaxTransactionSize
EfiUsbPolicyZeroLengthTerminationSupport
EfiUsbPolicyZeroLengthTermination

enum _EFI_USBFN_PORT_TYPE

Enumerator
EfiUsbUnknownPort
EfiUsbStandardDownstreamPort
EfiUsbChargingDownstreamPort
EfiUsbDedicatedChargingPort
EfiUsbInvalidDedicatedChargingPort

enum _EFI_USBFN_TRANSFER_STATUS

Enumerator
UsbTransferStatusUnknown
UsbTransferStatusComplete
UsbTransferStatusAborted
UsbTransferStatusActive
UsbTransferStatusNone

Function Documentation

typedef EFI_STATUS ( EFIAPI * EFI_USBFN_IO_GET_ENDPOINT_POLICY )

Returns information about what USB port type was attached.

Parameters

[in]	This	A pointer to the EFI_USBFN_IO_PROTOCOL instance.
[out]	PortType	Returns the USB port type.

Return values

EFI_SUCCESS	The function returned successfully.
EFI_INVALID_PARAMETER	A parameter is invalid.
EFI_DEVICE_ERROR	The physical device reported an error.
EFI_NOT_READY	The physical device is busy or not ready to process this request or there is no USB port attached to the device.

Configures endpoints based on supplied device and configuration descriptors.

Assuming that the hardware has already been initialized, this function configures the endpoints using the device information supplied by DeviceInfo, activates the port, and starts receiving USB events.

This function must ignore the bMaxPacketSize0field of the Standard Device Descriptor and the wMaxPacketSize field of the Standard Endpoint Descriptor that are made available through DeviceInfo.

Parameters

[in]	This	A pointer to the EFI_USBFN_IO_PROTOCOL instance.
[out]	DeviceInfo	A pointer to EFI_USBFN_DEVICE_INFO instance.

Return values

EFI_SUCCESS	The function returned successfully.
EFI_INVALID_PARAMETER	A parameter is invalid.
EFI_DEVICE_ERROR	The physical device reported an error.
EFI_NOT_READY	The physical device is busy or not ready to process this request.
EFI_OUT_OF_RESOURCES	The request could not be completed due to lack of resources.

Returns the maximum packet size of the specified endpoint type for the supplied bus speed.

If the BusSpeed is UsbBusSpeedUnknown, the maximum speed the underlying controller supports is assumed.

This protocol currently does not support isochronous or interrupt transfers. Future revisions of this protocol may eventually support it.

Parameters

[in]	This	A pointer to the EFI_USBFN_IO_PROTOCOLinstance.
[in]	EndpointType	Endpoint type as defined as EFI_USB_ENDPOINT_TYPE.
[in]	BusSpeed	Bus speed as defined as EFI_USB_BUS_SPEED.
[out]	MaxPacketSize	The maximum packet size, in bytes, of the specified endpoint type.

Return values

EFI_SUCCESS	The function returned successfully.
EFI_INVALID_PARAMETER	A parameter is invalid.
EFI_DEVICE_ERROR	The physical device reported an error.
EFI_NOT_READY	The physical device is busy or not ready to process this request.

Returns device specific information based on the supplied identifier as a Unicode string.

If the supplied Buffer isn't large enough, or is NULL, the method fails with EFI_BUFFER_TOO_SMALL and the required size is returned through BufferSize. All returned strings are in Unicode format.

An Id of EfiUsbDeviceInfoUnknown is treated as an invalid parameter.

Parameters

[in]	This	A pointer to the EFI_USBFN_IO_PROTOCOLinstance.
[in]	Id	The requested information id.
[in]	BufferSize	On input, the size of the Buffer in bytes. On output, the amount of data returned in Buffer in bytes.
[out]	Buffer	A pointer to a buffer to returnthe requested information as a Unicode string.

Return values

EFI_SUCCESS	The function returned successfully.
EFI_INVALID_PARAMETER	One or more of the following conditions is TRUE: BufferSize is NULL. BufferSize is not 0 and Buffer is NULL. Id in invalid.
EFI_DEVICE_ERROR	The physical device reported an error.
EFI_BUFFER_TOO_SMALL	The buffer is too small to hold the buffer. BufferSize has been updated with the size needed to hold the request string.

Returns the vendor-id and product-id of the device.

Parameters

[in]	This	A pointer to the EFI_USBFN_IO_PROTOCOL instance.
[out]	Vid	Returned vendor-id of the device.
[out]	Pid	Returned product-id of the device.

Return values

EFI_SUCCESS	The function returned successfully.
EFI_INVALID_PARAMETER	A parameter is invalid.
EFI_NOT_FOUND	Unable to return the vendor-id or the product-id.

Aborts the transfer on the specified endpoint.

This function should fail with EFI_INVALID_PARAMETER if the specified direction is incorrect for the endpoint.

Parameters

[in]	This	A pointer to the EFI_USBFN_IO_PROTOCOL instance.
[in]	EndpointIndex	Indicates the endpoint on which the ongoing transfer needs to be canceled.
[in]	Direction	Direction of the endpoint.

Return values

EFI_SUCCESS	The function returned successfully.
EFI_INVALID_PARAMETER	A parameter is invalid.
EFI_DEVICE_ERROR	The physical device reported an error.
EFI_NOT_READY	The physical device is busy or not ready to process this request.

Returns the stall state on the specified endpoint.

This function should fail with EFI_INVALID_PARAMETER if the specified direction is incorrect for the endpoint.

Parameters

[in]	This	A pointer to the EFI_USBFN_IO_PROTOCOL instance.
[in]	EndpointIndex	Indicates the endpoint.
[in]	Direction	Direction of the endpoint.
[in,out]	State	Boolean, true value indicates that the endpoint is in a stalled state, false otherwise.

Return values

EFI_SUCCESS	The function returned successfully.
EFI_INVALID_PARAMETER	A parameter is invalid.
EFI_DEVICE_ERROR	The physical device reported an error.
EFI_NOT_READY	The physical device is busy or not ready to process this request.

Sets or clears the stall state on the specified endpoint.

This function should fail with EFI_INVALID_PARAMETER if the specified direction is incorrect for the endpoint.

Parameters

[in]	This	A pointer to the EFI_USBFN_IO_PROTOCOL instance.
[in]	EndpointIndex	Indicates the endpoint.
[in]	Direction	Direction of the endpoint.
[in]	State	Requested stall state on the specified endpoint. True value causes the endpoint to stall; false value clears an existing stall.

Return values

EFI_SUCCESS	The function returned successfully.
EFI_INVALID_PARAMETER	A parameter is invalid.
EFI_DEVICE_ERROR	The physical device reported an error.
EFI_NOT_READY	The physical device is busy or not ready to process this request.

This function is called repeatedly to get information on USB bus states, receive-completion and transmit-completion events on the endpoints, and notification on setup packet on endpoint 0.

A class driver must call EFI_USBFN_IO_PROTOCOL.EventHandler()repeatedly to receive updates on the transfer status and number of bytes transferred on various endpoints.

Parameters

[in]	This	A pointer to the EFI_USBFN_IO_PROTOCOL instance.
[out]	Message	Indicates the event that initiated this notification.
[in,out]	PayloadSize	On input, the size of the memory pointed by Payload. On output, the amount ofdata returned in Payload.
[out]	Payload	A pointer to EFI_USBFN_MESSAGE_PAYLOAD instance to return additional payload for current message.

Return values

EFI_SUCCESS	The function returned successfully.
EFI_INVALID_PARAMETER	A parameter is invalid.
EFI_DEVICE_ERROR	The physical device reported an error.
EFI_NOT_READY	The physical device is busy or not ready to process this request.
EFI_BUFFER_TOO_SMALL	The Supplied buffer is not large enough to hold the message payload.

This function handles transferring data to or from the host on the specified endpoint, depending on the direction specified.

A class driver must call EFI_USBFN_IO_PROTOCOL.EventHandler() repeatedly to receive updates on the transfer status and the number of bytes transferred on various endpoints. Upon an update of the transfer status, the Buffer field of the EFI_USBFN_TRANSFER_RESULT structure (as described in the function description for EFI_USBFN_IO_PROTOCOL.EventHandler()) must be initialized with the Buffer pointer that was supplied to this method.

The overview of the call sequence is illustrated in the Figure 54.

This function should fail with EFI_INVALID_PARAMETER if the specified direction is incorrect for the endpoint.

Parameters

[in]	This	A pointer to the EFI_USBFN_IO_PROTOCOL instance.
[in]	EndpointIndex	Indicates the endpoint on which TX or RX transfer needs to take place.
[in]	Direction	Direction of the endpoint.
[in,out]	BufferSize	If Direction is EfiUsbEndpointDirectionDeviceRx: On input, the size of the Bufferin bytes. On output, the amount of data returned in Buffer in bytes. If Direction is EfiUsbEndpointDirectionDeviceTx: On input, the size of the Bufferin bytes. On output, the amount of data transmitted in bytes.
[in,out]	Buffer	If Direction is EfiUsbEndpointDirectionDeviceRx: The Buffer to return the received data. If Directionis EfiUsbEndpointDirectionDeviceTx: The Buffer that contains the data to be transmitted.

Return values

EFI_SUCCESS	The function returned successfully.
EFI_INVALID_PARAMETER	A parameter is invalid.
EFI_DEVICE_ERROR	The physical device reported an error.
EFI_NOT_READY	The physical device is busy or not ready to process this request.

Returns the maximum supported transfer size.

Returns the maximum number of bytes that the underlying controller can accommodate in a single transfer.

Parameters

[in]	This	A pointer to the EFI_USBFN_IO_PROTOCOL instance.
[out]	MaxTransferSize	The maximum supported transfer size, in bytes.

Return values

EFI_SUCCESS	The function returned successfully.
EFI_INVALID_PARAMETER	A parameter is invalid.
EFI_DEVICE_ERROR	The physical device reported an error.
EFI_NOT_READY	The physical device is busy or not ready to process this request.

Allocates a transfer buffer of the specified sizethat satisfies the controller requirements.

The AllocateTransferBuffer() function allocates a memory region of Size bytes and returns the address of the allocated memory that satisfies the underlying controller requirements in the location referenced by Buffer.

The allocated transfer buffer must be freed using a matching call to EFI_USBFN_IO_PROTOCOL.FreeTransferBuffer()function.

Parameters

[in]	This	A pointer to the EFI_USBFN_IO_PROTOCOL instance.
[in]	Size	The number of bytes to allocate for the transfer buffer.
[out]	Buffer	A pointer to a pointer to the allocated buffer if the call succeeds; undefined otherwise.

Return values

EFI_SUCCESS	The function returned successfully.
EFI_INVALID_PARAMETER	A parameter is invalid.
EFI_OUT_OF_RESOURCES	The requested transfer buffer could not be allocated.

Deallocates the memory allocated for the transfer buffer by the EFI_USBFN_IO_PROTOCOL.AllocateTransferBuffer() function.

The EFI_USBFN_IO_PROTOCOL.FreeTransferBuffer() function deallocates the memory specified by Buffer. The Buffer that is freed must have been allocated by EFI_USBFN_IO_PROTOCOL.AllocateTransferBuffer().

Parameters

[in]	This	A pointer to the EFI_USBFN_IO_PROTOCOL instance.
[in]	Buffer	A pointer to the transfer buffer to deallocate.

Return values

EFI_SUCCESS	The function returned successfully.
EFI_INVALID_PARAMETER	A parameter is invalid.

This function supplies power to the USB controller if needed and initializes the hardware and the internal data structures. The port must not be activated by this function.

Parameters

[in] This A pointer to the EFI_USBFN_IO_PROTOCOL instance.

Return values

EFI_SUCCESS	The function returned successfully.
EFI_INVALID_PARAMETER	A parameter is invalid.
EFI_DEVICE_ERROR	The physical device reported an error.

This function stops the USB hardware device.

Parameters

[in] This A pointer to the EFI_USBFN_IO_PROTOCOL instance.

Return values

EFI_SUCCESS	The function returned successfully.
EFI_INVALID_PARAMETER	A parameter is invalid.
EFI_DEVICE_ERROR	The physical device reported an error.

This function sets the configuration policy for the specified non-control endpoint.

This function can only be called before EFI_USBFN_IO_PROTOCOL.StartController() or after EFI_USBFN_IO_PROTOCOL.StopController() has been called.

Parameters

[in]	This	A pointer to the EFI_USBFN_IO_PROTOCOL instance.
[in]	EndpointIndex	Indicates the non-control endpoint for which the policy needs to be set.
[in]	Direction	Direction of the endpoint.
[in]	PolicyType	Policy type the user is trying to set for the specified non-control endpoint.
[in]	BufferSize	The size of the Bufferin bytes.
[in]	Buffer	The new value for the policy parameter that PolicyType specifies.

Return values

EFI_SUCCESS	The function returned successfully.
EFI_INVALID_PARAMETER	A parameter is invalid.
EFI_DEVICE_ERROR	The physical device reported an error.
EFI_UNSUPPORTED	Changing this policy value is not supported.

This function sets the configuration policy for the specified non-control endpoint.

This function can only be called before EFI_USBFN_IO_PROTOCOL.StartController() or after EFI_USBFN_IO_PROTOCOL.StopController() has been called.

Parameters

[in]	This	A pointer to the EFI_USBFN_IO_PROTOCOL instance.
[in]	EndpointIndex	Indicates the non-control endpoint for which the policy needs to be set.
[in]	Direction	Direction of the endpoint.
[in]	PolicyType	Policy type the user is trying to retrieve for the specified non-control endpoint.
[in,out]	BufferSize	On input, the size of Bufferin bytes. On output, the amount of data returned in Bufferin bytes.
[in,out]	Buffer	A pointer to a buffer to return requested endpoint policy value.

Return values

EFI_SUCCESS	The function returned successfully.
EFI_INVALID_PARAMETER	A parameter is invalid.
EFI_DEVICE_ERROR	The specified policy value is not supported.
EFI_BUFFER_TOO_SMALL	Supplied buffer is not large enough to hold requested policy value.

Variable Documentation

EFI_GUID gEfiUsbFunctionIoProtocolGuid

Data Structures

Macros

Typedefs

Enumerations

Functions

Variables

Detailed Description

Macro Definition Documentation

Typedef Documentation

Enumeration Type Documentation

Function Documentation

Variable Documentation