LUFA/Drivers/USB/HighLevel/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(uint8_t ConfigNumber, uint16_t* const ConfigSizePtr,
  35                                       void* BufferPtr, uint16_t BufferSize)
  36 {
  37         uint8_t ErrorCode;
  38         uint8_t ConfigHeader[sizeof(USB_Descriptor_Configuration_Header_t)];
  39
  40         USB_ControlRequest = (USB_Request_Header_t)
  41                 {
  42                         .bmRequestType = (REQDIR_DEVICETOHOST | REQTYPE_STANDARD | REQREC_DEVICE),
  43                         .bRequest      = REQ_GetDescriptor,
  44                         .wValue        = ((DTYPE_Configuration << 8) | (ConfigNumber - 1)),
  45                         .wIndex        = 0,
  46                         .wLength       = sizeof(USB_Descriptor_Configuration_Header_t),
  47                 };
  48
  49         Pipe_SelectPipe(PIPE_CONTROLPIPE);
  50
  51         if ((ErrorCode = USB_Host_SendControlRequest(ConfigHeader)) != HOST_SENDCONTROL_Successful)
  52           return ErrorCode;
  53
  54         #if defined(USE_NONSTANDARD_DESCRIPTOR_NAMES)
  55         *ConfigSizePtr = DESCRIPTOR_CAST(ConfigHeader, USB_Descriptor_Configuration_Header_t).TotalConfigurationSize;
  56         #else
  57         *ConfigSizePtr = DESCRIPTOR_CAST(ConfigHeader, USB_Descriptor_Configuration_Header_t).wTotalLength;
  58         #endif
  59
  60         if (*ConfigSizePtr > BufferSize)
  61           return HOST_GETCONFIG_BuffOverflow;
  62
  63         USB_ControlRequest.wLength = *ConfigSizePtr;
  64
  65         if ((ErrorCode = USB_Host_SendControlRequest(BufferPtr)) != HOST_SENDCONTROL_Successful)
  66           return ErrorCode;
  67
  68         if (DESCRIPTOR_TYPE(BufferPtr) != DTYPE_Configuration)
  69           return HOST_GETCONFIG_InvalidData;
  70
  71         return HOST_GETCONFIG_Successful;
  72 }
  73 #endif
  74
  75 void USB_GetNextDescriptorOfType(uint16_t* const BytesRem,
  76                                  uint8_t** const CurrConfigLoc,
  77                                  const uint8_t Type)
  78 {
  79         while (*BytesRem)
  80         {
  81                 USB_GetNextDescriptor(BytesRem, CurrConfigLoc);
  82
  83                 if (DESCRIPTOR_TYPE(*CurrConfigLoc) == Type)
  84                   return;
  85         }
  86 }
  87
  88 void USB_GetNextDescriptorOfTypeBefore(uint16_t* const BytesRem,
  89                                        uint8_t** const CurrConfigLoc,
  90                                        const uint8_t Type,
  91                                        const uint8_t BeforeType)
  92 {
  93         while (*BytesRem)
  94         {
  95                 USB_GetNextDescriptor(BytesRem, CurrConfigLoc);
  96
  97                 if (DESCRIPTOR_TYPE(*CurrConfigLoc) == Type)
  98                 {
  99                         return;
 100                 }
 101                 else if (DESCRIPTOR_TYPE(*CurrConfigLoc) == BeforeType)
 102                 {
 103                         *BytesRem = 0;
 104                         return;
 105                 }
 106         }
 107 }
 108
 109 void USB_GetNextDescriptorOfTypeAfter(uint16_t* const BytesRem,
 110                                       uint8_t** const CurrConfigLoc,
 111                                       const uint8_t Type,
 112                                       const uint8_t AfterType)
 113 {
 114         USB_GetNextDescriptorOfType(BytesRem, CurrConfigLoc, AfterType);
 115
 116         if (*BytesRem)
 117           USB_GetNextDescriptorOfType(BytesRem, CurrConfigLoc, Type);
 118 }
 119
 120 uint8_t USB_GetNextDescriptorComp(uint16_t* BytesRem, uint8_t** CurrConfigLoc, ConfigComparatorPtr_t ComparatorRoutine)
 121 {
 122         uint8_t ErrorCode;
 123
 124         while (*BytesRem)
 125         {
 126                 uint8_t*  PrevDescLoc  = *CurrConfigLoc;
 127                 uint16_t  PrevBytesRem = *BytesRem;
 128
 129                 USB_GetNextDescriptor(BytesRem, CurrConfigLoc);
 130
 131                 if ((ErrorCode = ComparatorRoutine(*CurrConfigLoc)) != DESCRIPTOR_SEARCH_NotFound)
 132                 {
 133                         if (ErrorCode == DESCRIPTOR_SEARCH_Fail)
 134                         {
 135                                 *CurrConfigLoc = PrevDescLoc;
 136                                 *BytesRem      = PrevBytesRem;
 137                         }
 138
 139                         return ErrorCode;
 140                 }
 141         }
 142
 143         return DESCRIPTOR_SEARCH_COMP_EndOfDescriptor;
 144 }