LUFA/Drivers/USB/HighLevel/ConfigDescriptor.c

   1 /*
   2              LUFA Library
   3      Copyright (C) Dean Camera, 2011.
   4
   5   dean [at] fourwalledcubicle [dot] com
   6            www.lufa-lib.org
   7 */
   8
   9 /*
  10   Copyright 2011  Dean Camera (dean [at] fourwalledcubicle [dot] com)
  11
  12   Permission to use, copy, modify, distribute, and sell this
  13   software and its documentation for any purpose is hereby granted
  14   without fee, provided that the above copyright notice appear in
  15   all 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 #define  __INCLUDE_FROM_USB_DRIVER
  32 #include "ConfigDescriptor.h"
  33
  34 #if defined(USB_CAN_BE_HOST)
  35 uint8_t USB_Host_GetDeviceConfigDescriptor(uint8_t ConfigNumber, uint16_t* const ConfigSizePtr,
  36                                            void* BufferPtr, uint16_t BufferSize)
  37 {
  38         uint8_t ErrorCode;
  39         uint8_t ConfigHeader[sizeof(USB_Descriptor_Configuration_Header_t)];
  40
  41         USB_ControlRequest = (USB_Request_Header_t)
  42                 {
  43                         .bmRequestType = (REQDIR_DEVICETOHOST | REQTYPE_STANDARD | REQREC_DEVICE),
  44                         .bRequest      = REQ_GetDescriptor,
  45                         .wValue        = ((DTYPE_Configuration << 8) | (ConfigNumber - 1)),
  46                         .wIndex        = 0,
  47                         .wLength       = sizeof(USB_Descriptor_Configuration_Header_t),
  48                 };
  49
  50         Pipe_SelectPipe(PIPE_CONTROLPIPE);
  51
  52         if ((ErrorCode = USB_Host_SendControlRequest(ConfigHeader)) != HOST_SENDCONTROL_Successful)
  53           return ErrorCode;
  54
  55         *ConfigSizePtr = DESCRIPTOR_PCAST(ConfigHeader, USB_Descriptor_Configuration_Header_t)->TotalConfigurationSize;
  56
  57         if (*ConfigSizePtr > BufferSize)
  58           return HOST_GETCONFIG_BuffOverflow;
  59
  60         USB_ControlRequest.wLength = *ConfigSizePtr;
  61
  62         if ((ErrorCode = USB_Host_SendControlRequest(BufferPtr)) != HOST_SENDCONTROL_Successful)
  63           return ErrorCode;
  64
  65         if (DESCRIPTOR_TYPE(BufferPtr) != DTYPE_Configuration)
  66           return HOST_GETCONFIG_InvalidData;
  67
  68         return HOST_GETCONFIG_Successful;
  69 }
  70 #endif
  71
  72 void USB_GetNextDescriptorOfType(uint16_t* const BytesRem,
  73                                  void** 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                                        void** 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                                       void** 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(uint16_t* const BytesRem, void** const CurrConfigLoc, ConfigComparatorPtr_t const 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 }
 142