system76-edk2/MdeModulePkg/Bus/Usb/UsbBusDxe/UsbDesc.h

/** @file

    Manage Usb Descriptor List

Copyright (c) 2007 - 2014, Intel Corporation. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent

**/

#ifndef _USB_DESCRIPTOR_H_
#define _USB_DESCRIPTOR_H_

#define USB_MAX_INTERFACE_SETTING  256

//
// The RequestType in EFI_USB_DEVICE_REQUEST is composed of
// three fields: One bit direction, 2 bit type, and 5 bit
// target.
//
#define USB_REQUEST_TYPE(Dir, Type, Target) \
          ((UINT8)((((Dir) == EfiUsbDataIn ? 0x01 : 0) << 7) | (Type) | (Target)))

//
// A common header for usb standard descriptor.
// Each stand descriptor has a length and type.
//
#pragma pack(1)
typedef struct {
  UINT8    Len;
  UINT8    Type;
} USB_DESC_HEAD;
#pragma pack()

//
// Each USB device has a device descriptor. Each device may
// have several configures. Each configure contains several
// interfaces. Each interface may have several settings. Each
// setting has several endpoints.
//
// EFI_USB_..._DESCRIPTOR must be the first member of the
// structure.
//
typedef struct {
  EFI_USB_ENDPOINT_DESCRIPTOR    Desc;
  UINT8                          Toggle;
} USB_ENDPOINT_DESC;

typedef struct {
  EFI_USB_INTERFACE_DESCRIPTOR    Desc;
  USB_ENDPOINT_DESC               **Endpoints;
} USB_INTERFACE_SETTING;

//
// An interface may have several settings. Use a
// fixed max number of settings to simplify code.
// It should sufice in most environments.
//
typedef struct {
  USB_INTERFACE_SETTING    *Settings[USB_MAX_INTERFACE_SETTING];
  UINTN                    NumOfSetting;
  UINTN                    ActiveIndex;       // Index of active setting
} USB_INTERFACE_DESC;

typedef struct {
  EFI_USB_CONFIG_DESCRIPTOR    Desc;
  USB_INTERFACE_DESC           **Interfaces;
} USB_CONFIG_DESC;

typedef struct {
  EFI_USB_DEVICE_DESCRIPTOR    Desc;
  USB_CONFIG_DESC              **Configs;
} USB_DEVICE_DESC;

/**
  USB standard control transfer support routine. This
  function is used by USB device. It is possible that
  the device's interfaces are still waiting to be
  enumerated.

  @param  UsbDev                The usb device.
  @param  Direction             The direction of data transfer.
  @param  Type                  Standard / class specific / vendor specific.
  @param  Target                The receiving target.
  @param  Request               Which request.
  @param  Value                 The wValue parameter of the request.
  @param  Index                 The wIndex parameter of the request.
  @param  Buf                   The buffer to receive data into / transmit from.
  @param  Length                The length of the buffer.

  @retval EFI_SUCCESS           The control request is executed.
  @retval EFI_DEVICE_ERROR      Failed to execute the control transfer.

**/
EFI_STATUS
UsbCtrlRequest (
  IN USB_DEVICE              *UsbDev,
  IN EFI_USB_DATA_DIRECTION  Direction,
  IN UINTN                   Type,
  IN UINTN                   Target,
  IN UINTN                   Request,
  IN UINT16                  Value,
  IN UINT16                  Index,
  IN OUT VOID                *Buf,
  IN UINTN                   Length
  );

/**
  Return the max packet size for endpoint zero. This function
  is the first function called to get descriptors during bus
  enumeration.

  @param  UsbDev                The usb device.

  @retval EFI_SUCCESS           The max packet size of endpoint zero is retrieved.
  @retval EFI_DEVICE_ERROR      Failed to retrieve it.

**/
EFI_STATUS
UsbGetMaxPacketSize0 (
  IN USB_DEVICE  *UsbDev
  );

/**
  Free a device descriptor with its configurations.

  @param  DevDesc               The device descriptor.

  @return None.

**/
VOID
UsbFreeDevDesc (
  IN USB_DEVICE_DESC  *DevDesc
  );

/**
  Retrieve the indexed string for the language. It requires two
  steps to get a string, first to get the string's length. Then
  the string itself.

  @param  UsbDev                The usb device.
  @param  StringIndex           The index of the string to retrieve.
  @param  LangId                Language ID.

  @return The created string descriptor or NULL.

**/
EFI_USB_STRING_DESCRIPTOR *
UsbGetOneString (
  IN     USB_DEVICE  *UsbDev,
  IN     UINT8       StringIndex,
  IN     UINT16      LangId
  );

/**
  Build the whole array of descriptors. This function must
  be called after UsbGetMaxPacketSize0 returns the max packet
  size correctly for endpoint 0.

  @param  UsbDev                The Usb device.

  @retval EFI_SUCCESS           The descriptor table is build.
  @retval EFI_OUT_OF_RESOURCES  Failed to allocate resource for the descriptor.

**/
EFI_STATUS
UsbBuildDescTable (
  IN USB_DEVICE  *UsbDev
  );

/**
  Set the device's address.

  @param  UsbDev                The device to set address to.
  @param  Address               The address to set.

  @retval EFI_SUCCESS           The device is set to the address.
  @retval Others                Failed to set the device address.

**/
EFI_STATUS
UsbSetAddress (
  IN USB_DEVICE  *UsbDev,
  IN UINT8       Address
  );

/**
  Set the device's configuration. This function changes
  the device's internal state. UsbSelectConfig changes
  the Usb bus's internal state.

  @param  UsbDev                The USB device to set configure to.
  @param  ConfigIndex           The configure index to set.

  @retval EFI_SUCCESS           The device is configured now.
  @retval Others                Failed to set the device configure.

**/
EFI_STATUS
UsbSetConfig (
  IN USB_DEVICE  *UsbDev,
  IN UINT8       ConfigIndex
  );

/**
  Usb UsbIo interface to clear the feature. This is should
  only be used by HUB which is considered a device driver
  on top of the UsbIo interface.

  @param  UsbIo                 The UsbIo interface.
  @param  Target                The target of the transfer: endpoint/device.
  @param  Feature               The feature to clear.
  @param  Index                 The wIndex parameter.

  @retval EFI_SUCCESS           The device feature is cleared.
  @retval Others                Failed to clear the feature.

**/
EFI_STATUS
UsbIoClearFeature (
  IN  EFI_USB_IO_PROTOCOL  *UsbIo,
  IN  UINTN                Target,
  IN  UINT16               Feature,
  IN  UINT16               Index
  );

#endif