+/*\r
+ LUFA Library\r
+ Copyright (C) Dean Camera, 2009.\r
+ \r
+ dean [at] fourwalledcubicle [dot] com\r
+ www.fourwalledcubicle.com\r
+*/\r
+\r
+/*\r
+ Copyright 2009 Dean Camera (dean [at] fourwalledcubicle [dot] com)\r
+\r
+ Permission to use, copy, modify, and distribute this software\r
+ and its documentation for any purpose and without fee is hereby\r
+ granted, provided that the above copyright notice appear in all\r
+ copies and that both that the copyright notice and this\r
+ permission notice and warranty disclaimer appear in supporting\r
+ documentation, and that the name of the author not be used in\r
+ advertising or publicity pertaining to distribution of the\r
+ software without specific, written prior permission.\r
+\r
+ The author disclaim all warranties with regard to this\r
+ software, including all implied warranties of merchantability\r
+ and fitness. In no event shall the author be liable for any\r
+ special, indirect or consequential damages or any damages\r
+ whatsoever resulting from loss of use, data or profits, whether\r
+ in an action of contract, negligence or other tortious action,\r
+ arising out of or in connection with the use or performance of\r
+ this software.\r
+*/\r
+\r
+/** \file\r
+ *\r
+ * Configuration descriptor parser API. This section of the library gives a friendly API which can be used in\r
+ * host applications to easily parse an attached device's configuration descriptor so that endpoint, interface\r
+ * and other descriptor data can be extracted and used as needed.\r
+ */\r
+\r
+#ifndef __CONFIGDESCRIPTOR_H__\r
+#define __CONFIGDESCRIPTOR_H__\r
+\r
+ /* Includes: */\r
+ #include <avr/io.h>\r
+ \r
+ #include "../../../Common/Common.h"\r
+ #include "../LowLevel/HostChapter9.h"\r
+ #include "../HighLevel/StdDescriptors.h"\r
+ \r
+ /* Enable C linkage for C++ Compilers: */\r
+ #if defined(__cplusplus)\r
+ extern "C" {\r
+ #endif\r
+\r
+ /* Public Interface - May be used in end-application: */\r
+ /* Macros: */\r
+ /** Casts a pointer to a descriptor inside the configuration descriptor into a pointer to the given\r
+ * descriptor type.\r
+ *\r
+ * Usage Example:\r
+ * \code\r
+ * uint8_t* CurrDescriptor = &ConfigDescriptor[0]; // Pointing to the configuration header\r
+ * USB_Descriptor_Configuration_Header_t* ConfigHeaderPtr = DESCRIPTOR_PCAST(CurrDescriptor,\r
+ * USB_Descriptor_Configuration_Header_t);\r
+ *\r
+ * // Can now access elements of the configuration header struct using the -> indirection operator\r
+ * \endcode\r
+ */\r
+ #define DESCRIPTOR_PCAST(DescriptorPtr, Type) ((Type*)DescriptorPtr)\r
+\r
+ /** Casts a pointer to a descriptor inside the configuration descriptor into the given descriptor\r
+ * type (as an actual struct instance rather than a pointer to a struct).\r
+ *\r
+ * Usage Example:\r
+ * \code\r
+ * uint8_t* CurrDescriptor = &ConfigDescriptor[0]; // Pointing to the configuration header\r
+ * USB_Descriptor_Configuration_Header_t ConfigHeader = DESCRIPTOR_CAST(CurrDescriptor,\r
+ * USB_Descriptor_Configuration_Header_t);\r
+ *\r
+ * // Can now access elements of the configuration header struct using the . operator\r
+ * \endcode\r
+ */\r
+ #define DESCRIPTOR_CAST(DescriptorPtr, Type) (*DESCRIPTOR_PCAST(DescriptorPtr, Type))\r
+\r
+ /** Returns the descriptor's type, expressed as the 8-bit type value in the header of the descriptor.\r
+ * This value's meaning depends on the descriptor's placement in the descriptor, but standard type\r
+ * values can be accessed in the DescriptorTypes_t enum located in USB/HighLevel/StdDescriptors.h.\r
+ */\r
+ #if defined(USE_NONSTANDARD_DESCRIPTOR_NAMES) || defined(__DOXYGEN__)\r
+ #define DESCRIPTOR_TYPE(DescriptorPtr) DESCRIPTOR_CAST(DescriptorPtr, USB_Descriptor_Header_t).Type\r
+ #else\r
+ #define DESCRIPTOR_TYPE(DescriptorPtr) DESCRIPTOR_CAST(DescriptorPtr, USB_Descriptor_Header_t).bDescriptorType \r
+ #endif\r
+ \r
+ /** Returns the descriptor's size, expressed as the 8-bit value indicating the number of bytes. */\r
+ #if defined(USE_NONSTANDARD_DESCRIPTOR_NAMES) || defined(__DOXYGEN__)\r
+ #define DESCRIPTOR_SIZE(DescriptorPtr) DESCRIPTOR_CAST(DescriptorPtr, USB_Descriptor_Header_t).Size\r
+ #else\r
+ #define DESCRIPTOR_SIZE(DescriptorPtr) DESCRIPTOR_CAST(DescriptorPtr, USB_Descriptor_Header_t).bLength\r
+ #endif\r
+ \r
+ /** Creates a prototype for or begins a descriptor comparitor routine. Descriptor comparitor routines are \r
+ * small search routines which are passed a pointer to the current sub descriptor in the configuration\r
+ * descriptor, and which analyse the sub descriptor to determine whether or not it matches the routine's\r
+ * search parameters. Comparitor routines provide a powerful way to scan through the config descriptor\r
+ * for certain descriptors matching unique criteria.\r
+ *\r
+ * Comparitor routines are passed in a single pointer named CurrentDescriptor, and should return a value\r
+ * of a member of the DSEARCH_Return_ErrorCodes_t enum.\r
+ */\r
+ #define DESCRIPTOR_COMPARATOR(name) uint8_t DCOMP_##name (void* const CurrentDescriptor)\r
+\r
+ /** Searches for the next descriptor in the given configuration descriptor using a premade comparator\r
+ * function. The routine updates the position and remaining configuration descriptor bytes values\r
+ * automatically. If a comparator routine fails a search, the descriptor pointer is retreated back\r
+ * so that the next descriptor search invocation will start from the descriptor which first caused the\r
+ * original search to fail. This behaviour allows for one comparator to be used immediately after another\r
+ * has failed, starting the second search from the descriptor which failed the first.\r
+ *\r
+ * \param DSize Pointer to an int storing the remaining bytes in the configuration descriptor\r
+ * \param DPos Pointer to the current position in the configuration descriptor\r
+ * \param DSearch Name of the comparitor search function to use on the configuration descriptor\r
+ *\r
+ * \return Value of one of the members of the DSEARCH_Comp_Return_ErrorCodes_t enum\r
+ *\r
+ * Usage Example:\r
+ * \code\r
+ * DESCRIPTOR_COMPARATOR(EndpointSearcher); // Comparator Prototype\r
+ *\r
+ * DESCRIPTOR_COMPARATOR(EndpointSearcher)\r
+ * {\r
+ * if (DESCRIPTOR_TYPE(CurrentDescriptor) == DTYPE_Endpoint)\r
+ * return Descriptor_Search_Found;\r
+ * else\r
+ * return Descriptor_Search_NotFound;\r
+ * }\r
+ *\r
+ * //...\r
+ * // After retrieving configuration descriptor:\r
+ * if (USB_Host_GetNextDescriptorComp(&BytesRemaining, &ConfigDescriptorData, EndpointSearcher) ==\r
+ * Descriptor_Search_Comp_Found)\r
+ * {\r
+ * // Do something with the endpoint descriptor\r
+ * }\r
+ * \endcode\r
+ */\r
+ #define USB_Host_GetNextDescriptorComp(DSize, DPos, DSearch) \\r
+ USB_Host_GetNextDescriptorComp_P(DSize, DPos, DCOMP_##DSearch)\r
+ /* Enums: */\r
+ /** Enum for return values of a descriptor comparator made with DESCRIPTOR_COMPARATOR. */\r
+ enum DSEARCH_Return_ErrorCodes_t\r
+ {\r
+ Descriptor_Search_Found = 0, /**< Current descriptor matches comparator criteria. */\r
+ Descriptor_Search_Fail = 1, /**< No further descriptor could possibly match criteria, fail the search. */\r
+ Descriptor_Search_NotFound = 2, /**< Current descriptor does not match comparator criteria. */\r
+ };\r
+\r
+ /** Enum for return values of USB_Host_GetNextDescriptorComp() */\r
+ enum DSEARCH_Comp_Return_ErrorCodes_t\r
+ {\r
+ Descriptor_Search_Comp_Found = 0, /**< Configuration descriptor now points to decriptor which matches\r
+ * search criteria of the given comparator function. */\r
+ Descriptor_Search_Comp_Fail = 1, /**< Comparator function returned Descriptor_Search_Fail. */\r
+ Descriptor_Search_Comp_EndOfDescriptor = 2, /**< End of configuration descriptor reached before match found. */\r
+ };\r
+ \r
+ /* Function Prototypes: */\r
+ /** Retrieves the configuration descriptor data or size from an attached device via a standard request.\r
+ *\r
+ * \param ConfigSizePtr Pointer to a uint16_t for either storing or retrieving the configuration\r
+ * descriptor size\r
+ *\r
+ * \param BufferPtr Pointer to the buffer for storing the configuration descriptor data. If this is\r
+ * NULL, the size of the configuration descriptor will be retrieved instead and\r
+ * placed in the variable pointed to by ConfigSizePtr. If this is non-NULL, the number\r
+ * of bytes indicated by ConfigSizePtr of the configuration descriptor will be loaded\r
+ * into the buffer\r
+ */\r
+ uint8_t USB_Host_GetDeviceConfigDescriptor(uint16_t* const ConfigSizePtr, void* BufferPtr)\r
+ ATTR_NON_NULL_PTR_ARG(1);\r
+\r
+ /* Inline Functions: */\r
+ /** Skips over the current sub-descriptor inside the configuration descriptor, so that the pointer then\r
+ points to the next sub-descriptor. The bytes remaining value is automatically decremented.\r
+ *\r
+ * \param BytesRem Pointer to the number of bytes remaining of the configuration descriptor\r
+ * \param CurrConfigLoc Pointer to the current descriptor inside the configuration descriptor\r
+ */\r
+ static inline void USB_Host_GetNextDescriptor(uint16_t* const BytesRem,\r
+ uint8_t** const CurrConfigLoc) \r
+ ATTR_NON_NULL_PTR_ARG(1, 2); \r
+ static inline void USB_Host_GetNextDescriptor(uint16_t* const BytesRem,\r
+ uint8_t** const CurrConfigLoc)\r
+ {\r
+ #if defined(USE_NONSTANDARD_DESCRIPTOR_NAMES)\r
+ uint16_t CurrDescriptorSize = DESCRIPTOR_CAST(*CurrConfigLoc, USB_Descriptor_Header_t).Size;\r
+ #else\r
+ uint16_t CurrDescriptorSize = DESCRIPTOR_CAST(*CurrConfigLoc, USB_Descriptor_Header_t).bLength; \r
+ #endif\r
+\r
+ *CurrConfigLoc += CurrDescriptorSize;\r
+ *BytesRem -= CurrDescriptorSize;\r
+ }\r
+\r
+ /** Skips to the next sub-descriptor inside the configuration descriptor of the specified type value.\r
+ * The bytes remaining value is automatically decremented.\r
+ *\r
+ * \param BytesRem Pointer to the number of bytes remaining of the configuration descriptor\r
+ * \param CurrConfigLoc Pointer to the current descriptor inside the configuration descriptor\r
+ * \param Type Descriptor type value to search for\r
+ */\r
+ void USB_Host_GetNextDescriptorOfType(uint16_t* const BytesRem,\r
+ uint8_t** const CurrConfigLoc,\r
+ const uint8_t Type)\r
+ ATTR_NON_NULL_PTR_ARG(1, 2);\r
+\r
+ /** Skips to the next sub-descriptor inside the configuration descriptor of the specified type value,\r
+ * which must come before a descriptor of the second given type value. If the BeforeType type\r
+ * descriptor is reached first, the number of bytes remaining to process is set to zero and the\r
+ * function exits. The bytes remaining value is automatically decremented.\r
+ *\r
+ * \param BytesRem Pointer to the number of bytes remaining of the configuration descriptor\r
+ * \param CurrConfigLoc Pointer to the current descriptor inside the configuration descriptor\r
+ * \param Type Descriptor type value to search for\r
+ * \param BeforeType Descriptor type value which must not be reached before the given Type descriptor\r
+ */\r
+ void USB_Host_GetNextDescriptorOfTypeBefore(uint16_t* const BytesRem,\r
+ uint8_t** const CurrConfigLoc,\r
+ const uint8_t Type,\r
+ const uint8_t BeforeType)\r
+ ATTR_NON_NULL_PTR_ARG(1, 2);\r
+\r
+ /** Skips to the next sub-descriptor inside the configuration descriptor of the specified type value,\r
+ * which must come after a descriptor of the second given type value. The bytes remaining value is\r
+ * automatically decremented.\r
+ *\r
+ * \param BytesRem Pointer to the number of bytes remaining of the configuration descriptor\r
+ * \param CurrConfigLoc Pointer to the current descriptor inside the configuration descriptor\r
+ * \param Type Descriptor type value to search for\r
+ * \param AfterType Descriptor type value which must be reached before the given Type descriptor\r
+ */\r
+ void USB_Host_GetNextDescriptorOfTypeAfter(uint16_t* const BytesRem,\r
+ uint8_t** const CurrConfigLoc,\r
+ const uint8_t Type,\r
+ const uint8_t AfterType)\r
+ ATTR_NON_NULL_PTR_ARG(1, 2);\r
+ \r
+ /* Private Interface - For use in library only: */\r
+ #if !defined(__DOXYGEN__)\r
+ /* Function Prototypes: */\r
+ uint8_t USB_Host_GetNextDescriptorComp_P(uint16_t* BytesRem, uint8_t** CurrConfigLoc,\r
+ uint8_t (* const ComparatorRoutine)(void* const));\r
+ #endif\r
+ \r
+ /* Disable C linkage for C++ Compilers: */\r
+ #if defined(__cplusplus)\r
+ }\r
+ #endif\r
+ \r
+#endif\r
projects / pub / lufa.git / blobdiff