LUFA/Drivers/USB/Class/ConfigDescriptor.c

   1 /*
   2              LUFA Library
   3      Copyright (C) Dean Camera, 2009.
   4
   5   dean [at] fourwalledcubicle [dot] com
   6       www.fourwalledcubicle.com
   7 */
   8
   9 /*
  10   Copyright 2009  Dean Camera (dean [at] fourwalledcubicle [dot] com)
  11
  12   Permission to use, copy, modify, and distribute this software
  13   and its documentation for any purpose and without fee is hereby
  14   granted, provided that the above copyright notice appear in all
  15   copies and that both that the copyright notice and this
  16   permission notice and warranty disclaimer appear in supporting
  17   documentation, and that the name of the author not be used in
  18   advertising or publicity pertaining to distribution of the
  19   software without specific, written prior permission.
  20
  21   The author disclaim all warranties with regard to this
  22   software, including all implied warranties of merchantability
  23   and fitness.  In no event shall the author be liable for any
  24   special, indirect or consequential damages or any damages
  25   whatsoever resulting from loss of use, data or profits, whether
  26   in an action of contract, negligence or other tortious action,
  27   arising out of or in connection with the use or performance of
  28   this software.
  29 */
  30
  31 #include "ConfigDescriptor.h"
  32
  33 uint8_t USB_Host_GetDeviceConfigDescriptor(uint16_t* const ConfigSizePtr, void* BufferPtr)
  34 {
  35         uint8_t ErrorCode;
  36
  37         USB_HostRequest = (USB_Host_Request_Header_t)
  38                 {
  39                         bmRequestType: (REQDIR_DEVICETOHOST | REQTYPE_STANDARD | REQREC_DEVICE),
  40                         bRequest:      REQ_GetDescriptor,
  41                         wValue:        (DTYPE_Configuration << 8),
  42                         wIndex:        0,
  43                         wLength:       sizeof(USB_Descriptor_Configuration_Header_t),
  44                 };
  45
  46         if (BufferPtr == NULL)
  47         {
  48                 uint8_t ConfigHeader[sizeof(USB_Descriptor_Configuration_Header_t)];
  49
  50                 ErrorCode      = USB_Host_SendControlRequest(ConfigHeader);
  51
  52                 #if defined(USE_NONSTANDARD_DESCRIPTOR_NAMES)
  53                 *ConfigSizePtr = DESCRIPTOR_CAST(ConfigHeader, USB_Descriptor_Configuration_Header_t).TotalConfigurationSize;
  54                 #else
  55                 *ConfigSizePtr = DESCRIPTOR_CAST(ConfigHeader, USB_Descriptor_Configuration_Header_t).wTotalLength;
  56                 #endif
  57         }
  58         else
  59         {
  60                 USB_HostRequest.wLength = *ConfigSizePtr;
  61
  62                 ErrorCode      = USB_Host_SendControlRequest(BufferPtr);
  63         }
  64
  65         return ErrorCode;
  66 }
  67
  68 void USB_Host_GetNextDescriptorOfType(uint16_t* const BytesRem,
  69                                       uint8_t** const CurrConfigLoc,
  70                                       const uint8_t Type)
  71 {
  72         while (*BytesRem)
  73         {
  74                 USB_Host_GetNextDescriptor(BytesRem, CurrConfigLoc);
  75
  76                 if (DESCRIPTOR_TYPE(*CurrConfigLoc) == Type)
  77                   return;
  78         }
  79 }
  80
  81 void USB_Host_GetNextDescriptorOfTypeBefore(uint16_t* const BytesRem,
  82                                             uint8_t** const CurrConfigLoc,
  83                                             const uint8_t Type,
  84                                             const uint8_t BeforeType)
  85 {
  86         while (*BytesRem)
  87         {
  88                 USB_Host_GetNextDescriptor(BytesRem, CurrConfigLoc);
  89
  90                 if (DESCRIPTOR_TYPE(*CurrConfigLoc) == Type)
  91                 {
  92                         return;
  93                 }
  94                 else if (DESCRIPTOR_TYPE(*CurrConfigLoc) == BeforeType)
  95                 {
  96                         *BytesRem = 0;
  97                         return;
  98                 }
  99         }
 100 }
 101
 102 void USB_Host_GetNextDescriptorOfTypeAfter(uint16_t* const BytesRem,
 103                                            uint8_t** const CurrConfigLoc,
 104                                            const uint8_t Type,
 105                                            const uint8_t AfterType)
 106 {
 107         USB_Host_GetNextDescriptorOfType(BytesRem, CurrConfigLoc, AfterType);
 108
 109         if (*BytesRem)
 110           USB_Host_GetNextDescriptorOfType(BytesRem, CurrConfigLoc, Type);
 111 }
 112
 113 uint8_t USB_Host_GetNextDescriptorComp_P(uint16_t* BytesRem, uint8_t** CurrConfigLoc,
 114                                          uint8_t (* const ComparatorRoutine)(void*))
 115 {
 116         uint8_t ErrorCode;
 117
 118         while (*BytesRem)
 119         {
 120                 uint8_t*  PrevDescLoc = *CurrConfigLoc;
 121                 uint16_t  PrevBytesRem = *BytesRem;
 122
 123                 USB_Host_GetNextDescriptor(BytesRem, CurrConfigLoc);
 124
 125                 if ((ErrorCode = ComparatorRoutine(*CurrConfigLoc)) != Descriptor_Search_NotFound)
 126                 {
 127                         if (ErrorCode == Descriptor_Search_Fail)
 128                         {
 129                                 *CurrConfigLoc = PrevDescLoc;
 130                                 *BytesRem      = PrevBytesRem;
 131                         }
 132
 133                         return ErrorCode;
 134                 }
 135         }
 136
 137         return Descriptor_Search_Comp_EndOfDescriptor;
 138 }