64e5c4084f
Descriptor processing routines now pass around void pointers rather than uint8_t pointers, as their destination datatype is know well known -- they are just streams of bytes until they are cast to the correct destination type by DESCRIPTOR_CAST.
277 lines
14 KiB
C
277 lines
14 KiB
C
/*
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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 "../HighLevel/USBMode.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 \ref USB_DescriptorTypes_t enum.
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*/
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#define DESCRIPTOR_TYPE(DescriptorPtr) DESCRIPTOR_CAST(DescriptorPtr, USB_Descriptor_Header_t).Type
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/** Returns the descriptor's size, expressed as the 8-bit value indicating the number of bytes. */
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#define DESCRIPTOR_SIZE(DescriptorPtr) DESCRIPTOR_CAST(DescriptorPtr, USB_Descriptor_Header_t).Size
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/* Type Defines: */
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/** Type define for a Configuration Descriptor comparator function (function taking a pointer to an array
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* of type void, returning a uint8_t value).
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*
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* \see \ref USB_GetNextDescriptorComp function for more details
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*/
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typedef uint8_t (* const ConfigComparatorPtr_t)(void* const);
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/* Function Prototypes: */
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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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* Comparator functions should be standard functions which accept a pointer to the header of the current
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* descriptor inside the configuration descriptor which is being compared, and should return a value from
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* the \ref DSearch_Return_ErrorCodes_t enum as a uint8_t value.
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*
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* \note This function is available in USB Host mode only.
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*
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* \param[in,out] BytesRem Pointer to an int storing the remaining bytes in the configuration descriptor
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* \param[in,out] CurrConfigLoc Pointer to the current position in the configuration descriptor
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* \param[in] ComparatorRoutine 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 \ref 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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* uint8_t EndpointSearcher(void* CurrentDescriptor); // Comparator Prototype
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*
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* uint8_t EndpointSearcher(void* CurrentDescriptor)
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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, &CurrentConfigLoc, 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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uint8_t USB_GetNextDescriptorComp(uint16_t* BytesRem, void** CurrConfigLoc, ConfigComparatorPtr_t ComparatorRoutine);
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/* Enums: */
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/** Enum for the possible return codes of the \ref USB_GetDeviceConfigDescriptor() function. */
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enum USB_Host_GetConfigDescriptor_ErrorCodes_t
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{
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HOST_GETCONFIG_Successful = 0, /**< No error occurred while retrieving the configuration descriptor */
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HOST_GETCONFIG_DeviceDisconnect = 1, /**< The attached device was disconnected while retrieving the configuration
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* descriptor
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*/
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HOST_GETCONFIG_PipeError = 2, /**< An error occurred in the pipe while sending the request */
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HOST_GETCONFIG_SetupStalled = 3, /**< The attached device stalled the request to retrieve the configuration
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* descriptor
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*/
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HOST_GETCONFIG_SoftwareTimeOut = 4, /**< The request or data transfer timed out */
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HOST_GETCONFIG_BuffOverflow = 5, /**< The device's configuration descriptor is too large to fit into the allocated
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* buffer
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*/
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HOST_GETCONFIG_InvalidData = 6, /**< The device returned invalid configuration descriptor data */
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};
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/** Enum for return values of a descriptor comparator function. */
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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 \ref USB_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 from an attached device via a standard request into a buffer,
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* including validity and size checking to prevent a buffer overflow.
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*
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* \param[in] ConfigNumber Device configuration descriptor number to fetch from the device (usually set to 1 for
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* single configuration devices)
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* \param[in,out] ConfigSizePtr Pointer to a uint16_t for storing the retrieved configuration descriptor size
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* \param[out] BufferPtr Pointer to the buffer for storing the configuration descriptor data.
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* \param[out] BufferSize Size of the allocated buffer where the configuration descriptor is to be stored
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*
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* \return A value from the \ref USB_Host_GetConfigDescriptor_ErrorCodes_t enum
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*/
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uint8_t USB_GetDeviceConfigDescriptor(uint8_t ConfigNumber, uint16_t* const ConfigSizePtr, void* BufferPtr,
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uint16_t BufferSize) ATTR_NON_NULL_PTR_ARG(2, 3);
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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[in,out] BytesRem Pointer to the number of bytes remaining of the configuration descriptor
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* \param[in,out] CurrConfigLoc Pointer to the current descriptor inside the configuration descriptor
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* \param[in] Type Descriptor type value to search for
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*/
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void USB_GetNextDescriptorOfType(uint16_t* const BytesRem,
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void** 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[in,out] BytesRem Pointer to the number of bytes remaining of the configuration descriptor
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* \param[in,out] CurrConfigLoc Pointer to the current descriptor inside the configuration descriptor
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* \param[in] Type Descriptor type value to search for
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* \param[in] BeforeType Descriptor type value which must not be reached before the given Type descriptor
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*/
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void USB_GetNextDescriptorOfTypeBefore(uint16_t* const BytesRem,
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void** 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[in,out] BytesRem Pointer to the number of bytes remaining of the configuration descriptor
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* \param[in,out] CurrConfigLoc Pointer to the current descriptor inside the configuration descriptor
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* \param[in] Type Descriptor type value to search for
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* \param[in] AfterType Descriptor type value which must be reached before the given Type descriptor
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*/
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void USB_GetNextDescriptorOfTypeAfter(uint16_t* const BytesRem,
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void** 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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/* 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[in,out] BytesRem Pointer to the number of bytes remaining of the configuration descriptor
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* \param[in,out] CurrConfigLoc Pointer to the current descriptor inside the configuration descriptor
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*/
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static inline void USB_GetNextDescriptor(uint16_t* const BytesRem,
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void** const CurrConfigLoc)
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ATTR_NON_NULL_PTR_ARG(1, 2);
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static inline void USB_GetNextDescriptor(uint16_t* const BytesRem,
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void** const CurrConfigLoc)
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{
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uint16_t CurrDescriptorSize = DESCRIPTOR_CAST(*CurrConfigLoc, USB_Descriptor_Header_t).Size;
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*CurrConfigLoc += CurrDescriptorSize;
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*BytesRem -= CurrDescriptorSize;
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}
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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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