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 #if defined(USB_CAN_BE_HOST)
  34 uint8_t USB_GetDeviceConfigDescriptor(uint16_t* const ConfigSizePtr, void* BufferPtr)
  35 {
  36         uint8_t ErrorCode;
  37
  38         USB_ControlRequest = (USB_Request_Header_t)
  39                 {
  40                         .bmRequestType = (REQDIR_DEVICETOHOST | REQTYPE_STANDARD | REQREC_DEVICE),
  41                         .bRequest      = REQ_GetDescriptor,
  42                         .wValue        = (DTYPE_Configuration << 8),
  43                         .wIndex        = 0,
  44                         .wLength       = sizeof(USB_Descriptor_Configuration_Header_t),
  45                 };
  46
  47         Pipe_SelectPipe(PIPE_CONTROLPIPE);
  48
  49         if (BufferPtr == NULL)
  50         {
  51                 uint8_t ConfigHeader[sizeof(USB_Descriptor_Configuration_Header_t)];
  52
  53                 ErrorCode      = USB_Host_SendControlRequest(ConfigHeader);
  54
  55                 #if defined(USE_NONSTANDARD_DESCRIPTOR_NAMES)
  56                 *ConfigSizePtr = DESCRIPTOR_CAST(ConfigHeader, USB_Descriptor_Configuration_Header_t).TotalConfigurationSize;
  57                 #else
  58                 *ConfigSizePtr = DESCRIPTOR_CAST(ConfigHeader, USB_Descriptor_Configuration_Header_t).wTotalLength;
  59                 #endif
  60         }
  61         else
  62         {
  63                 USB_ControlRequest.wLength = *ConfigSizePtr;
  64
  65                 ErrorCode      = USB_Host_SendControlRequest(BufferPtr);
  66         }
  67
  68         return ErrorCode;
  69 }
  70 #endif
  71
  72 void USB_GetNextDescriptorOfType(uint16_t* const BytesRem,
  73                                  uint8_t** const CurrConfigLoc,
  74                                  const uint8_t Type)
  75 {
  76         while (*BytesRem)
  77         {
  78                 USB_GetNextDescriptor(BytesRem, CurrConfigLoc);
  79
  80                 if (DESCRIPTOR_TYPE(*CurrConfigLoc) == Type)
  81                   return;
  82         }
  83 }
  84
  85 void USB_GetNextDescriptorOfTypeBefore(uint16_t* const BytesRem,
  86                                        uint8_t** const CurrConfigLoc,
  87                                        const uint8_t Type,
  88                                        const uint8_t BeforeType)
  89 {
  90         while (*BytesRem)
  91         {
  92                 USB_GetNextDescriptor(BytesRem, CurrConfigLoc);
  93
  94                 if (DESCRIPTOR_TYPE(*CurrConfigLoc) == Type)
  95                 {
  96                         return;
  97                 }
  98                 else if (DESCRIPTOR_TYPE(*CurrConfigLoc) == BeforeType)
  99                 {
 100                         *BytesRem = 0;
 101                         return;
 102                 }
 103         }
 104 }
 105
 106 void USB_GetNextDescriptorOfTypeAfter(uint16_t* const BytesRem,
 107                                       uint8_t** const CurrConfigLoc,
 108                                       const uint8_t Type,
 109                                       const uint8_t AfterType)
 110 {
 111         USB_GetNextDescriptorOfType(BytesRem, CurrConfigLoc, AfterType);
 112
 113         if (*BytesRem)
 114           USB_GetNextDescriptorOfType(BytesRem, CurrConfigLoc, Type);
 115 }
 116
 117 uint8_t USB_GetNextDescriptorComp_Prv(uint16_t* BytesRem, uint8_t** CurrConfigLoc, ComparatorPtr_t ComparatorRoutine)
 118 {
 119         uint8_t ErrorCode;
 120
 121         while (*BytesRem)
 122         {
 123                 uint8_t*  PrevDescLoc = *CurrConfigLoc;
 124                 uint16_t  PrevBytesRem = *BytesRem;
 125
 126                 USB_GetNextDescriptor(BytesRem, CurrConfigLoc);
 127
 128                 if ((ErrorCode = ComparatorRoutine(*CurrConfigLoc)) != DESCRIPTOR_SEARCH_NotFound)
 129                 {
 130                         if (ErrorCode == DESCRIPTOR_SEARCH_Fail)
 131                         {
 132                                 *CurrConfigLoc = PrevDescLoc;
 133                                 *BytesRem      = PrevBytesRem;
 134                         }
 135
 136                         return ErrorCode;
 137                 }
 138         }
 139
 140         return DESCRIPTOR_SEARCH_COMP_EndOfDescriptor;
 141 }