+++ /dev/null
-/*
- LUFA Library
- Copyright (C) Dean Camera, 2011.
-
- dean [at] fourwalledcubicle [dot] com
- www.lufa-lib.org
-*/
-
-/*
- Copyright 2011 Dean Camera (dean [at] fourwalledcubicle [dot] com)
-
- Permission to use, copy, modify, distribute, and sell this
- software and its documentation for any purpose is hereby granted
- without fee, provided that the above copyright notice appear in
- all copies and that both that the copyright notice and this
- permission notice and warranty disclaimer appear in supporting
- documentation, and that the name of the author not be used in
- advertising or publicity pertaining to distribution of the
- software without specific, written prior permission.
-
- The author disclaim all warranties with regard to this
- software, including all implied warranties of merchantability
- and fitness. In no event shall the author be liable for any
- special, indirect or consequential damages or any damages
- whatsoever resulting from loss of use, data or profits, whether
- in an action of contract, negligence or other tortious action,
- arising out of or in connection with the use or performance of
- this software.
-*/
-
-/** \file
- * \brief Configuration descriptor parser API.
- *
- * This section of the library gives a friendly API which can be used in host applications to easily
- * parse an attached device's configuration descriptor so that endpoint, interface and other descriptor
- * data can be extracted and used as needed.
- *
- * \note This file should not be included directly. It is automatically included as needed by the USB driver
- * dispatch header located in LUFA/Drivers/USB/USB.h.
- */
-
-/** \ingroup Group_Descriptors
- * \defgroup Group_ConfigDescriptorParser Configuration Descriptor Parser
- *
- * Functions, macros, variables, enums and types related to the parsing of Configuration Descriptors.
- *
- * @{
- */
-
-#ifndef __CONFIGDESCRIPTOR_H__
-#define __CONFIGDESCRIPTOR_H__
-
- /* Includes: */
- #include <stdint.h>
-
- #include "../../../Common/Common.h"
- #include "HostStandardReq.h"
- #include "USBMode.h"
- #include "StdDescriptors.h"
-
- /* Enable C linkage for C++ Compilers: */
- #if defined(__cplusplus)
- extern "C" {
- #endif
-
- /* Preprocessor Checks: */
- #if !defined(__INCLUDE_FROM_USB_DRIVER)
- #error Do not include this file directly. Include LUFA/Drivers/USB/USB.h instead.
- #endif
-
- /* Public Interface - May be used in end-application: */
- /* Macros: */
- /** Mask for determining the type of an endpoint from an endpoint descriptor. This should then be compared
- * with the \c EP_TYPE_* masks to determine the exact type of the endpoint.
- */
- #define EP_TYPE_MASK 0x03
-
- /** Casts a pointer to a descriptor inside the configuration descriptor into a pointer to the given
- * descriptor type.
- *
- * Usage Example:
- * \code
- * uint8_t* CurrDescriptor = &ConfigDescriptor[0]; // Pointing to the configuration header
- * USB_Descriptor_Configuration_Header_t* ConfigHeaderPtr = DESCRIPTOR_PCAST(CurrDescriptor,
- * USB_Descriptor_Configuration_Header_t);
- *
- * // Can now access elements of the configuration header struct using the -> indirection operator
- * \endcode
- */
- #define DESCRIPTOR_PCAST(DescriptorPtr, Type) ((Type*)(DescriptorPtr))
-
- /** Casts a pointer to a descriptor inside the configuration descriptor into the given descriptor
- * type (as an actual struct instance rather than a pointer to a struct).
- *
- * Usage Example:
- * \code
- * uint8_t* CurrDescriptor = &ConfigDescriptor[0]; // Pointing to the configuration header
- * USB_Descriptor_Configuration_Header_t ConfigHeader = DESCRIPTOR_CAST(CurrDescriptor,
- * USB_Descriptor_Configuration_Header_t);
- *
- * // Can now access elements of the configuration header struct using the . operator
- * \endcode
- */
- #define DESCRIPTOR_CAST(DescriptorPtr, Type) (*DESCRIPTOR_PCAST(DescriptorPtr, Type))
-
- /** Returns the descriptor's type, expressed as the 8-bit type value in the header of the descriptor.
- * This value's meaning depends on the descriptor's placement in the descriptor, but standard type
- * values can be accessed in the \ref USB_DescriptorTypes_t enum.
- */
- #define DESCRIPTOR_TYPE(DescriptorPtr) DESCRIPTOR_PCAST(DescriptorPtr, USB_Descriptor_Header_t)->Type
-
- /** Returns the descriptor's size, expressed as the 8-bit value indicating the number of bytes. */
- #define DESCRIPTOR_SIZE(DescriptorPtr) DESCRIPTOR_PCAST(DescriptorPtr, USB_Descriptor_Header_t)->Size
-
- /* Type Defines: */
- /** Type define for a Configuration Descriptor comparator function (function taking a pointer to an array
- * of type void, returning a uint8_t value).
- *
- * \see \ref USB_GetNextDescriptorComp function for more details.
- */
- typedef uint8_t (* ConfigComparatorPtr_t)(void*);
-
- /* Enums: */
- /** Enum for the possible return codes of the \ref USB_Host_GetDeviceConfigDescriptor() function. */
- enum USB_Host_GetConfigDescriptor_ErrorCodes_t
- {
- HOST_GETCONFIG_Successful = 0, /**< No error occurred while retrieving the configuration descriptor. */
- HOST_GETCONFIG_DeviceDisconnect = 1, /**< The attached device was disconnected while retrieving the configuration
- * descriptor.
- */
- HOST_GETCONFIG_PipeError = 2, /**< An error occurred in the pipe while sending the request. */
- HOST_GETCONFIG_SetupStalled = 3, /**< The attached device stalled the request to retrieve the configuration
- * descriptor.
- */
- HOST_GETCONFIG_SoftwareTimeOut = 4, /**< The request or data transfer timed out. */
- HOST_GETCONFIG_BuffOverflow = 5, /**< The device's configuration descriptor is too large to fit into the allocated
- * buffer.
- */
- HOST_GETCONFIG_InvalidData = 6, /**< The device returned invalid configuration descriptor data. */
- };
-
- /** Enum for return values of a descriptor comparator function. */
- enum DSearch_Return_ErrorCodes_t
- {
- DESCRIPTOR_SEARCH_Found = 0, /**< Current descriptor matches comparator criteria. */
- DESCRIPTOR_SEARCH_Fail = 1, /**< No further descriptor could possibly match criteria, fail the search. */
- DESCRIPTOR_SEARCH_NotFound = 2, /**< Current descriptor does not match comparator criteria. */
- };
-
- /** Enum for return values of \ref USB_GetNextDescriptorComp(). */
- enum DSearch_Comp_Return_ErrorCodes_t
- {
- DESCRIPTOR_SEARCH_COMP_Found = 0, /**< Configuration descriptor now points to descriptor which matches
- * search criteria of the given comparator function. */
- DESCRIPTOR_SEARCH_COMP_Fail = 1, /**< Comparator function returned \ref DESCRIPTOR_SEARCH_Fail. */
- DESCRIPTOR_SEARCH_COMP_EndOfDescriptor = 2, /**< End of configuration descriptor reached before match found. */
- };
-
- /* Function Prototypes: */
- /** Retrieves the configuration descriptor data from an attached device via a standard request into a buffer,
- * including validity and size checking to prevent a buffer overflow.
- *
- * \param[in] ConfigNumber Device configuration descriptor number to fetch from the device (usually set to 1 for
- * single configuration devices).
- * \param[in,out] ConfigSizePtr Pointer to a location for storing the retrieved configuration descriptor size.
- * \param[out] BufferPtr Pointer to the buffer for storing the configuration descriptor data.
- * \param[out] BufferSize Size of the allocated buffer where the configuration descriptor is to be stored.
- *
- * \return A value from the \ref USB_Host_GetConfigDescriptor_ErrorCodes_t enum.
- */
- uint8_t USB_Host_GetDeviceConfigDescriptor(uint8_t ConfigNumber, uint16_t* const ConfigSizePtr, void* BufferPtr,
- uint16_t BufferSize) ATTR_NON_NULL_PTR_ARG(2) ATTR_NON_NULL_PTR_ARG(3);
-
- /** Skips to the next sub-descriptor inside the configuration descriptor of the specified type value.
- * The bytes remaining value is automatically decremented.
- *
- * \param[in,out] BytesRem Pointer to the number of bytes remaining of the configuration descriptor.
- * \param[in,out] CurrConfigLoc Pointer to the current descriptor inside the configuration descriptor.
- * \param[in] Type Descriptor type value to search for.
- */
- void USB_GetNextDescriptorOfType(uint16_t* const BytesRem,
- void** const CurrConfigLoc,
- const uint8_t Type)
- ATTR_NON_NULL_PTR_ARG(1) ATTR_NON_NULL_PTR_ARG(2);
-
- /** Skips to the next sub-descriptor inside the configuration descriptor of the specified type value,
- * which must come before a descriptor of the second given type value. If the BeforeType type
- * descriptor is reached first, the number of bytes remaining to process is set to zero and the
- * function exits. The bytes remaining value is automatically decremented.
- *
- * \param[in,out] BytesRem Pointer to the number of bytes remaining of the configuration descriptor.
- * \param[in,out] CurrConfigLoc Pointer to the current descriptor inside the configuration descriptor.
- * \param[in] Type Descriptor type value to search for.
- * \param[in] BeforeType Descriptor type value which must not be reached before the given Type descriptor.
- */
- void USB_GetNextDescriptorOfTypeBefore(uint16_t* const BytesRem,
- void** const CurrConfigLoc,
- const uint8_t Type,
- const uint8_t BeforeType)
- ATTR_NON_NULL_PTR_ARG(1) ATTR_NON_NULL_PTR_ARG(2);
-
- /** Skips to the next sub-descriptor inside the configuration descriptor of the specified type value,
- * which must come after a descriptor of the second given type value. The bytes remaining value is
- * automatically decremented.
- *
- * \param[in,out] BytesRem Pointer to the number of bytes remaining of the configuration descriptor.
- * \param[in,out] CurrConfigLoc Pointer to the current descriptor inside the configuration descriptor.
- * \param[in] Type Descriptor type value to search for.
- * \param[in] AfterType Descriptor type value which must be reached before the given Type descriptor.
- */
- void USB_GetNextDescriptorOfTypeAfter(uint16_t* const BytesRem,
- void** const CurrConfigLoc,
- const uint8_t Type,
- const uint8_t AfterType)
- ATTR_NON_NULL_PTR_ARG(1) ATTR_NON_NULL_PTR_ARG(2);
-
- /** Searches for the next descriptor in the given configuration descriptor using a pre-made comparator
- * function. The routine updates the position and remaining configuration descriptor bytes values
- * automatically. If a comparator routine fails a search, the descriptor pointer is retreated back
- * so that the next descriptor search invocation will start from the descriptor which first caused the
- * original search to fail. This behaviour allows for one comparator to be used immediately after another
- * has failed, starting the second search from the descriptor which failed the first.
- *
- * Comparator functions should be standard functions which accept a pointer to the header of the current
- * descriptor inside the configuration descriptor which is being compared, and should return a value from
- * the \ref DSearch_Return_ErrorCodes_t enum as a uint8_t value.
- *
- * \note This function is available in USB Host mode only.
- *
- * \param[in,out] BytesRem Pointer to an int storing the remaining bytes in the configuration descriptor.
- * \param[in,out] CurrConfigLoc Pointer to the current position in the configuration descriptor.
- * \param[in] ComparatorRoutine Name of the comparator search function to use on the configuration descriptor.
- *
- * \return Value of one of the members of the \ref DSearch_Comp_Return_ErrorCodes_t enum.
- *
- * Usage Example:
- * \code
- * uint8_t EndpointSearcher(void* CurrentDescriptor); // Comparator Prototype
- *
- * uint8_t EndpointSearcher(void* CurrentDescriptor)
- * {
- * if (DESCRIPTOR_TYPE(CurrentDescriptor) == DTYPE_Endpoint)
- * return DESCRIPTOR_SEARCH_Found;
- * else
- * return DESCRIPTOR_SEARCH_NotFound;
- * }
- *
- * //...
- * // After retrieving configuration descriptor:
- * if (USB_Host_GetNextDescriptorComp(&BytesRemaining, &CurrentConfigLoc, EndpointSearcher) ==
- * Descriptor_Search_Comp_Found)
- * {
- * // Do something with the endpoint descriptor
- * }
- * \endcode
- */
- uint8_t USB_GetNextDescriptorComp(uint16_t* const BytesRem,
- void** const CurrConfigLoc,
- ConfigComparatorPtr_t const ComparatorRoutine);
-
- /* Inline Functions: */
- /** Skips over the current sub-descriptor inside the configuration descriptor, so that the pointer then
- points to the next sub-descriptor. The bytes remaining value is automatically decremented.
- *
- * \param[in,out] BytesRem Pointer to the number of bytes remaining of the configuration descriptor.
- * \param[in,out] CurrConfigLoc Pointer to the current descriptor inside the configuration descriptor.
- */
- static inline void USB_GetNextDescriptor(uint16_t* const BytesRem,
- void** CurrConfigLoc) ATTR_NON_NULL_PTR_ARG(1) ATTR_NON_NULL_PTR_ARG(2);
- static inline void USB_GetNextDescriptor(uint16_t* const BytesRem,
- void** CurrConfigLoc)
- {
- uint16_t CurrDescriptorSize = DESCRIPTOR_CAST(*CurrConfigLoc, USB_Descriptor_Header_t).Size;
-
- *CurrConfigLoc = ((uint8_t*)*CurrConfigLoc) + CurrDescriptorSize;
- *BytesRem -= CurrDescriptorSize;
- }
-
- /* Disable C linkage for C++ Compilers: */
- #if defined(__cplusplus)
- }
- #endif
-
-#endif
-
-/** @} */
-
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