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274 lines
14 KiB
274 lines
14 KiB
/*
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LUFA Library
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Copyright (C) Dean Camera, 2009.
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dean [at] fourwalledcubicle [dot] com
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www.fourwalledcubicle.com
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*/
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/*
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Copyright 2009 Dean Camera (dean [at] fourwalledcubicle [dot] com)
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Permission to use, copy, modify, and distribute this software
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and its documentation for any purpose and without fee is hereby
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granted, provided that the above copyright notice appear in all
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copies and that both that the copyright notice and this
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permission notice and warranty disclaimer appear in supporting
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documentation, and that the name of the author not be used in
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advertising or publicity pertaining to distribution of the
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software without specific, written prior permission.
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The author disclaim all warranties with regard to this
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software, including all implied warranties of merchantability
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and fitness. In no event shall the author be liable for any
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special, indirect or consequential damages or any damages
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whatsoever resulting from loss of use, data or profits, whether
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in an action of contract, negligence or other tortious action,
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arising out of or in connection with the use or performance of
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this software.
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*/
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/** \file
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*
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* Configuration descriptor parser API. This section of the library gives a friendly API which can be used in
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* host applications to easily parse an attached device's configuration descriptor so that endpoint, interface
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* and other descriptor data can be extracted and used as needed.
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*/
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/** \ingroup Group_Descriptors
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* @defgroup Group_ConfigDescriptorParser Configuration Descriptor Parser
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*
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* Functions, macros, variables, enums and types related to the parsing of Configuration Descriptors.
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*
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* @{
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*/
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#ifndef __CONFIGDESCRIPTOR_H__
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#define __CONFIGDESCRIPTOR_H__
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/* Includes: */
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#include <avr/io.h>
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#include "../../../Common/Common.h"
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#include "../LowLevel/HostChapter9.h"
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#include "../HighLevel/StdDescriptors.h"
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/* Enable C linkage for C++ Compilers: */
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#if defined(__cplusplus)
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extern "C" {
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#endif
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/* Public Interface - May be used in end-application: */
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/* Macros: */
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/** Mask for determining the type of an endpoint from an endpoint descriptor. This should then be compared
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* with the EP_TYPE_* masks to determine the exact type of the endpoint.
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*/
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#define EP_TYPE_MASK 0x03
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/** Casts a pointer to a descriptor inside the configuration descriptor into a pointer to the given
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* descriptor type.
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*
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* Usage Example:
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* \code
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* uint8_t* CurrDescriptor = &ConfigDescriptor[0]; // Pointing to the configuration header
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* USB_Descriptor_Configuration_Header_t* ConfigHeaderPtr = DESCRIPTOR_PCAST(CurrDescriptor,
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* USB_Descriptor_Configuration_Header_t);
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*
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* // Can now access elements of the configuration header struct using the -> indirection operator
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* \endcode
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*/
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#define DESCRIPTOR_PCAST(DescriptorPtr, Type) ((Type*)DescriptorPtr)
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/** Casts a pointer to a descriptor inside the configuration descriptor into the given descriptor
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* type (as an actual struct instance rather than a pointer to a struct).
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*
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* Usage Example:
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* \code
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* uint8_t* CurrDescriptor = &ConfigDescriptor[0]; // Pointing to the configuration header
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* USB_Descriptor_Configuration_Header_t ConfigHeader = DESCRIPTOR_CAST(CurrDescriptor,
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* USB_Descriptor_Configuration_Header_t);
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*
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* // Can now access elements of the configuration header struct using the . operator
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* \endcode
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*/
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#define DESCRIPTOR_CAST(DescriptorPtr, Type) (*DESCRIPTOR_PCAST(DescriptorPtr, Type))
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/** Returns the descriptor's type, expressed as the 8-bit type value in the header of the descriptor.
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* This value's meaning depends on the descriptor's placement in the descriptor, but standard type
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* values can be accessed in the DescriptorTypes_t enum located in USB/HighLevel/StdDescriptors.h.
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*/
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#if defined(USE_NONSTANDARD_DESCRIPTOR_NAMES) || defined(__DOXYGEN__)
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#define DESCRIPTOR_TYPE(DescriptorPtr) DESCRIPTOR_CAST(DescriptorPtr, USB_Descriptor_Header_t).Type
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#else
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#define DESCRIPTOR_TYPE(DescriptorPtr) DESCRIPTOR_CAST(DescriptorPtr, USB_Descriptor_Header_t).bDescriptorType
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#endif
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/** Returns the descriptor's size, expressed as the 8-bit value indicating the number of bytes. */
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#if defined(USE_NONSTANDARD_DESCRIPTOR_NAMES) || defined(__DOXYGEN__)
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#define DESCRIPTOR_SIZE(DescriptorPtr) DESCRIPTOR_CAST(DescriptorPtr, USB_Descriptor_Header_t).Size
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#else
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#define DESCRIPTOR_SIZE(DescriptorPtr) DESCRIPTOR_CAST(DescriptorPtr, USB_Descriptor_Header_t).bLength
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#endif
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/** Creates a prototype for or begins a descriptor comparator routine. Descriptor comparator routines are
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* small search routines which are passed a pointer to the current sub descriptor in the configuration
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* descriptor, and which analyse the sub descriptor to determine whether or not it matches the routine's
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* search parameters. Comparator routines provide a powerful way to scan through the config descriptor
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* for certain descriptors matching unique criteria.
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*
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* Comparator routines are passed in a single pointer named CurrentDescriptor, and should return a value
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* of a member of the DSearch_Return_ErrorCodes_t enum.
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*/
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#define DESCRIPTOR_COMPARATOR(name) uint8_t DCOMP_##name (void* const CurrentDescriptor)
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/** Searches for the next descriptor in the given configuration descriptor using a premade comparator
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* function. The routine updates the position and remaining configuration descriptor bytes values
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* automatically. If a comparator routine fails a search, the descriptor pointer is retreated back
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* so that the next descriptor search invocation will start from the descriptor which first caused the
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* original search to fail. This behaviour allows for one comparator to be used immediately after another
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* has failed, starting the second search from the descriptor which failed the first.
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*
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* \param DSize Pointer to an int storing the remaining bytes in the configuration descriptor
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* \param DPos Pointer to the current position in the configuration descriptor
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* \param DSearch Name of the comparator search function to use on the configuration descriptor
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*
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* \return Value of one of the members of the DSearch_Comp_Return_ErrorCodes_t enum
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*
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* Usage Example:
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* \code
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* DESCRIPTOR_COMPARATOR(EndpointSearcher); // Comparator Prototype
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*
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* DESCRIPTOR_COMPARATOR(EndpointSearcher)
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* {
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* if (DESCRIPTOR_TYPE(CurrentDescriptor) == DTYPE_Endpoint)
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* return Descriptor_Search_Found;
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* else
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* return Descriptor_Search_NotFound;
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* }
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*
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* //...
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* // After retrieving configuration descriptor:
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* if (USB_Host_GetNextDescriptorComp(&BytesRemaining, &ConfigDescriptorData, EndpointSearcher) ==
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* Descriptor_Search_Comp_Found)
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* {
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* // Do something with the endpoint descriptor
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* }
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* \endcode
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*/
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#define USB_Host_GetNextDescriptorComp(DSize, DPos, DSearch) \
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USB_Host_GetNextDescriptorComp_P(DSize, DPos, DCOMP_##DSearch)
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/* Enums: */
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/** Enum for return values of a descriptor comparator made with DESCRIPTOR_COMPARATOR. */
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enum DSearch_Return_ErrorCodes_t
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{
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Descriptor_Search_Found = 0, /**< Current descriptor matches comparator criteria. */
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Descriptor_Search_Fail = 1, /**< No further descriptor could possibly match criteria, fail the search. */
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Descriptor_Search_NotFound = 2, /**< Current descriptor does not match comparator criteria. */
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};
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/** Enum for return values of USB_Host_GetNextDescriptorComp() */
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enum DSearch_Comp_Return_ErrorCodes_t
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{
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Descriptor_Search_Comp_Found = 0, /**< Configuration descriptor now points to descriptor which matches
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* search criteria of the given comparator function. */
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Descriptor_Search_Comp_Fail = 1, /**< Comparator function returned Descriptor_Search_Fail. */
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Descriptor_Search_Comp_EndOfDescriptor = 2, /**< End of configuration descriptor reached before match found. */
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};
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/* Function Prototypes: */
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/** Retrieves the configuration descriptor data or size from an attached device via a standard request.
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*
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* \param ConfigSizePtr Pointer to a uint16_t for either storing or retrieving the configuration
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* descriptor size
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*
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* \param BufferPtr Pointer to the buffer for storing the configuration descriptor data. If this is
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* NULL, the size of the configuration descriptor will be retrieved instead and
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* placed in the variable pointed to by ConfigSizePtr. If this is non-NULL, the number
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* of bytes indicated by ConfigSizePtr of the configuration descriptor will be loaded
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* into the buffer
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*/
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uint8_t USB_Host_GetDeviceConfigDescriptor(uint16_t* const ConfigSizePtr, void* BufferPtr)
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ATTR_NON_NULL_PTR_ARG(1);
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/* Inline Functions: */
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/** Skips over the current sub-descriptor inside the configuration descriptor, so that the pointer then
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points to the next sub-descriptor. The bytes remaining value is automatically decremented.
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*
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* \param BytesRem Pointer to the number of bytes remaining of the configuration descriptor
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* \param CurrConfigLoc Pointer to the current descriptor inside the configuration descriptor
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*/
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static inline void USB_Host_GetNextDescriptor(uint16_t* const BytesRem,
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uint8_t** const CurrConfigLoc)
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ATTR_NON_NULL_PTR_ARG(1, 2);
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static inline void USB_Host_GetNextDescriptor(uint16_t* const BytesRem,
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uint8_t** const CurrConfigLoc)
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{
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#if defined(USE_NONSTANDARD_DESCRIPTOR_NAMES)
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uint16_t CurrDescriptorSize = DESCRIPTOR_CAST(*CurrConfigLoc, USB_Descriptor_Header_t).Size;
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#else
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uint16_t CurrDescriptorSize = DESCRIPTOR_CAST(*CurrConfigLoc, USB_Descriptor_Header_t).bLength;
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#endif
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*CurrConfigLoc += CurrDescriptorSize;
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*BytesRem -= CurrDescriptorSize;
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}
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/** Skips to the next sub-descriptor inside the configuration descriptor of the specified type value.
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* The bytes remaining value is automatically decremented.
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*
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* \param BytesRem Pointer to the number of bytes remaining of the configuration descriptor
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* \param CurrConfigLoc Pointer to the current descriptor inside the configuration descriptor
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* \param Type Descriptor type value to search for
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*/
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void USB_Host_GetNextDescriptorOfType(uint16_t* const BytesRem,
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uint8_t** const CurrConfigLoc,
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const uint8_t Type)
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ATTR_NON_NULL_PTR_ARG(1, 2);
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/** Skips to the next sub-descriptor inside the configuration descriptor of the specified type value,
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* which must come before a descriptor of the second given type value. If the BeforeType type
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* descriptor is reached first, the number of bytes remaining to process is set to zero and the
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* function exits. The bytes remaining value is automatically decremented.
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*
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* \param BytesRem Pointer to the number of bytes remaining of the configuration descriptor
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* \param CurrConfigLoc Pointer to the current descriptor inside the configuration descriptor
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* \param Type Descriptor type value to search for
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* \param BeforeType Descriptor type value which must not be reached before the given Type descriptor
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*/
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void USB_Host_GetNextDescriptorOfTypeBefore(uint16_t* const BytesRem,
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uint8_t** const CurrConfigLoc,
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const uint8_t Type,
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const uint8_t BeforeType)
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ATTR_NON_NULL_PTR_ARG(1, 2);
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/** Skips to the next sub-descriptor inside the configuration descriptor of the specified type value,
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* which must come after a descriptor of the second given type value. The bytes remaining value is
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* automatically decremented.
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*
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* \param BytesRem Pointer to the number of bytes remaining of the configuration descriptor
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* \param CurrConfigLoc Pointer to the current descriptor inside the configuration descriptor
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* \param Type Descriptor type value to search for
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* \param AfterType Descriptor type value which must be reached before the given Type descriptor
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*/
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void USB_Host_GetNextDescriptorOfTypeAfter(uint16_t* const BytesRem,
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uint8_t** const CurrConfigLoc,
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const uint8_t Type,
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const uint8_t AfterType)
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ATTR_NON_NULL_PTR_ARG(1, 2);
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/* Private Interface - For use in library only: */
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#if !defined(__DOXYGEN__)
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/* Function Prototypes: */
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uint8_t USB_Host_GetNextDescriptorComp_P(uint16_t* BytesRem, uint8_t** CurrConfigLoc,
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uint8_t (* const ComparatorRoutine)(void* const));
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#endif
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/* Disable C linkage for C++ Compilers: */
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#if defined(__cplusplus)
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}
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#endif
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#endif
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/** @} */
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