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root / LUFA / Drivers / USB / Core / ConfigDescriptor.c @ 978b99e5

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/*
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             LUFA Library
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     Copyright (C) Dean Camera, 2011.
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  dean [at] fourwalledcubicle [dot] com
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           www.lufa-lib.org
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*/
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/*
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  Copyright 2011  Dean Camera (dean [at] fourwalledcubicle [dot] com)
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  Permission to use, copy, modify, distribute, and sell this
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  software and its documentation for any purpose is hereby granted
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  without fee, provided that the above copyright notice appear in
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  all copies and that both that the copyright notice and this
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  permission notice and warranty disclaimer appear in supporting
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  documentation, and that the name of the author not be used in
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  advertising or publicity pertaining to distribution of the
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  software without specific, written prior permission.
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  The author disclaim all warranties with regard to this
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  software, including all implied warranties of merchantability
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  and fitness.  In no event shall the author be liable for any
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  special, indirect or consequential damages or any damages
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  whatsoever resulting from loss of use, data or profits, whether
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  in an action of contract, negligence or other tortious action,
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  arising out of or in connection with the use or performance of
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  this software.
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*/
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#define  __INCLUDE_FROM_USB_DRIVER
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#include "ConfigDescriptor.h"
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#if defined(USB_CAN_BE_HOST)
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uint8_t USB_Host_GetDeviceConfigDescriptor(const uint8_t ConfigNumber,
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                                           uint16_t* const ConfigSizePtr,
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                                           void* const BufferPtr,
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                                           const uint16_t BufferSize)
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{
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        uint8_t ErrorCode;
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        uint8_t ConfigHeader[sizeof(USB_Descriptor_Configuration_Header_t)];
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        USB_ControlRequest = (USB_Request_Header_t)
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                {
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                        .bmRequestType = (REQDIR_DEVICETOHOST | REQTYPE_STANDARD | REQREC_DEVICE),
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                        .bRequest      = REQ_GetDescriptor,
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                        .wValue        = ((DTYPE_Configuration << 8) | (ConfigNumber - 1)),
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                        .wIndex        = 0,
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                        .wLength       = sizeof(USB_Descriptor_Configuration_Header_t),
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                };
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        Pipe_SelectPipe(PIPE_CONTROLPIPE);
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        if ((ErrorCode = USB_Host_SendControlRequest(ConfigHeader)) != HOST_SENDCONTROL_Successful)
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          return ErrorCode;
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        *ConfigSizePtr = le16_to_cpu(DESCRIPTOR_PCAST(ConfigHeader, USB_Descriptor_Configuration_Header_t)->TotalConfigurationSize);
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        if (*ConfigSizePtr > BufferSize)
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          return HOST_GETCONFIG_BuffOverflow;
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        USB_ControlRequest.wLength = *ConfigSizePtr;
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        if ((ErrorCode = USB_Host_SendControlRequest(BufferPtr)) != HOST_SENDCONTROL_Successful)
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          return ErrorCode;
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        if (DESCRIPTOR_TYPE(BufferPtr) != DTYPE_Configuration)
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          return HOST_GETCONFIG_InvalidData;
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        return HOST_GETCONFIG_Successful;
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}
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#endif
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void USB_GetNextDescriptorOfType(uint16_t* const BytesRem,
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                                 void** const CurrConfigLoc,
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                                 const uint8_t Type)
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{
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        while (*BytesRem)
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        {
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                USB_GetNextDescriptor(BytesRem, CurrConfigLoc);
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                if (DESCRIPTOR_TYPE(*CurrConfigLoc) == Type)
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                  return;
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        }
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}
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void USB_GetNextDescriptorOfTypeBefore(uint16_t* const BytesRem,
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                                       void** const CurrConfigLoc,
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                                       const uint8_t Type,
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                                       const uint8_t BeforeType)
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{
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        while (*BytesRem)
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        {
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                USB_GetNextDescriptor(BytesRem, CurrConfigLoc);
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                if (DESCRIPTOR_TYPE(*CurrConfigLoc) == Type)
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                {
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                        return;
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                }
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                else if (DESCRIPTOR_TYPE(*CurrConfigLoc) == BeforeType)
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                {
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                        *BytesRem = 0;
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                        return;
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                }
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        }
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}
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void USB_GetNextDescriptorOfTypeAfter(uint16_t* const BytesRem,
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                                      void** const CurrConfigLoc,
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                                      const uint8_t Type,
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                                      const uint8_t AfterType)
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{
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        USB_GetNextDescriptorOfType(BytesRem, CurrConfigLoc, AfterType);
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        if (*BytesRem)
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          USB_GetNextDescriptorOfType(BytesRem, CurrConfigLoc, Type);
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}
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uint8_t USB_GetNextDescriptorComp(uint16_t* const BytesRem,
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                                  void** const CurrConfigLoc,
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                                  ConfigComparatorPtr_t const ComparatorRoutine)
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{
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        uint8_t ErrorCode;
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        while (*BytesRem)
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        {
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                uint8_t* PrevDescLoc  = *CurrConfigLoc;
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                uint16_t PrevBytesRem = *BytesRem;
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                USB_GetNextDescriptor(BytesRem, CurrConfigLoc);
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                if ((ErrorCode = ComparatorRoutine(*CurrConfigLoc)) != DESCRIPTOR_SEARCH_NotFound)
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                {
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                        if (ErrorCode == DESCRIPTOR_SEARCH_Fail)
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                        {
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                                *CurrConfigLoc = PrevDescLoc;
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                                *BytesRem      = PrevBytesRem;
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                        }
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                        return ErrorCode;
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                }
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        }
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        return DESCRIPTOR_SEARCH_COMP_EndOfDescriptor;
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}
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