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253 lines
12 KiB
253 lines
12 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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* USB Human Interface Device (HID) Class report descriptor processing routines. This file allows for the easy
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* parsing of the complex HID report descriptor, which describes the data that the device transmits to the host.
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*
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* The processed report is presented back to the user application as a flat structure containing each report
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* item's IN, OUT and FEATURE (if desired) items along with each item's attributes.
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*
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* This library portion also allows for easy setting and retrieval of data from a HID report, including devices
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* with multiple reports on the one HID interface.
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*
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* By default, FEATURE reports and IN/OUT reports with constant data are ignored in the HID report when processed
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* to save on memory. This can be overridden by defining the HID_ENABLE_FEATURE_PROCESSING or
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* HID_INCLUDE_CONSTANT_DATA_ITEMS tokens in the user project makefile, passing them to the compiler via the -D
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* switch.
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*/
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#ifndef __HIDPARSER_H__
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#define __HIDPARSER_H__
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/* Includes: */
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#include <string.h>
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#include <stdbool.h>
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#include "HIDReportData.h"
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#include "../../../Common/Common.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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/* Preprocessor checks and defines: */
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#if !defined(HID_STATETABLE_STACK_DEPTH) || defined(__DOXYGEN__)
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/** Constant indicating the maximum stack depth of the state table. A larger state table
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* allows for more PUSH/POP report items to be nested, but consumes more memory. By default
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* this is set to 3 levels (allowing for two PUSHes to be nested) but this can be overridden by
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* defining HID_STATETABLE_STACK_DEPTH to another value in the user project makefile, passing the
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* define to the compiler using the -D compiler switch.
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*/
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#define HID_STATETABLE_STACK_DEPTH 3
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#endif
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#if !defined(HID_USAGE_STACK_DEPTH) || defined(__DOXYGEN__)
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/** Constant indicating the maximum stack depth of the usage table. A larger usage table
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* allows for more USAGE items to be indicated sequentially for REPORT COUNT entries of more than
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* one, but requires more stack space. By default this is set to 8 levels (allowing for a report
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* item with a count of 8) but this can be overridden by defining HID_USAGE_STACK_DEPTH to another
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* value in the user project makefile, passing the define to the compiler using the -D compiler
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* switch.
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*/
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#define HID_USAGE_STACK_DEPTH 8
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#endif
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#if !defined(HID_MAX_COLLECTIONS) || defined(__DOXYGEN__)
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/** Constant indicating the maximum number of COLLECTION items (nested or unnested) that can be
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* processed in the report item descriptor. A large value allows for more COLLECTION items to be
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* processed, but consumes more memory. By default this is set to 5 collections, but this can be
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* overridden by defining HID_MAX_COLLECTIONS to another value in the user project makefile, passing
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* the define to the compiler using the -D compiler switch.
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*/
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#define HID_MAX_COLLECTIONS 5
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#endif
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#if !defined(HID_MAX_REPORTITEMS) || defined(__DOXYGEN__)
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/** Constant indicating the maximum number of report items (IN, OUT or FEATURE if enabled) that can be
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* processed in the report item descriptor. A large value allows for more report items to be
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* processed, but consumes more memory. By default this is set to 30 items, but this can be
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* overridden by defining HID_MAX_REPORTITEMS to another value in the user project makefile, passing
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* the define to the compiler using the -D compiler switch.
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*/
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#define HID_MAX_REPORTITEMS 30
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#endif
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/* Public Interface - May be used in end-application: */
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/* Enums: */
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/** Enum for indicating what type of report item an entry in a HID_ReportInfo_t ReportItem array is */
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enum HID_ReportItemTypes_t
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{
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REPORT_ITEM_TYPE_In = 0, /**< Indicates that the item is an IN report type. */
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REPORT_ITEM_TYPE_Out = 1, /**< Indicates that the item is an OUT report type. */
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REPORT_ITEM_TYPE_Feature = 2, /**< Indicates that the item is a FEATURE report type. */
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};
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/** Enum for the possible error codes in the return value of the ProcessHIDReport() function */
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enum HID_Parse_ErrorCodes_t
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{
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HID_PARSE_Successful = 0, /**< Successful parse of the HID report descriptor, no error. */
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HID_PARSE_HIDStackOverflow = 1, /**< More than HID_STATETABLE_STACK_DEPTH nested PUSHes in the report. */
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HID_PARSE_HIDStackUnderflow = 2, /**< A POP was found when the state table stack was empty. */
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HID_PARSE_InsufficientReportItems = 3, /**< More than HID_MAX_REPORTITEMS report items in the report. */
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HID_PARSE_UnexpectedEndCollection = 4, /**< END COLLECTION found without matching COLLECTION item. */
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HID_PARSE_InsufficientCollectionPaths = 5, /**< More than HID_MAX_COLLECTIONS collections in the report. */
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HID_PARSE_UsageStackOverflow = 6, /**< More than HID_USAGE_STACK_DEPTH usages listed in a row. */
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};
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/* Type Defines: */
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/** Type define for an attribute with both minimum and maximum values (e.g. Logical Min/Max). */
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typedef struct
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{
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uint32_t Minimum; /**< Minimum value for the attribute. */
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uint32_t Maximum; /**< Maximum value for the attribute. */
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} HID_MinMax_t;
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/** Type define for the Unit attributes of a report item. */
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typedef struct
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{
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uint32_t Type; /**< Unit type (refer to HID specifications for details). */
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uint8_t Exponent; /**< Unit exponent (refer to HID specifications for details). */
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} HID_Unit_t;
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/** Type define for the Usage attributes of a report item. */
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typedef struct
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{
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uint16_t Page; /**< Usage page of the report item. */
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uint16_t Usage; /**< Usage of the report item. */
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HID_MinMax_t MinMax; /**< Usage minimum and maximum of the report item. */
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} HID_Usage_t;
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/** Type define for a COLLECTION object. Contains the collection attributes and a reference to the
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* parent collection if any.
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*/
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typedef struct CollectionPath
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{
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uint8_t Type; /**< Collection type (for example "Generic Desktop"). */
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HID_Usage_t Usage; /**< Collection usage. */
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struct CollectionPath* Parent; /**< Reference to parent collection, or NULL if root collection. */
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} HID_CollectionPath_t;
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/** Type define for all the data attributes of a report item, except flags. */
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typedef struct
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{
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uint8_t BitSize; /**< Size in bits of the report item's data. */
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HID_Usage_t Usage; /**< Usage of the report item. */
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HID_Unit_t Unit; /**< Unit type and exponent of the report item. */
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HID_MinMax_t Logical; /**< Logical minimum and maximum of the report item. */
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HID_MinMax_t Physical; /**< Physical minimum and maximum of the report item. */
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} HID_ReportItem_Attributes_t;
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/** Type define for a report item (IN, OUT or FEATURE) attributes and other details. */
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typedef struct
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{
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uint16_t BitOffset; /**< Bit offset in the IN, OUT or FEATURE report of the item. */
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uint8_t ItemType; /**< Report item type, a value in HID_Types_t. */
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uint16_t ItemFlags; /**< Item data flags, such as constant/variable, etc. */
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uint8_t ReportID; /**< Report ID this item belongs to, or 0x00 if device has only one report */
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HID_CollectionPath_t* CollectionPath; /**< Collection path of the item. */
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HID_ReportItem_Attributes_t Attributes; /**< Report item attributes. */
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uint32_t Value; /**< Current value of the report item. */
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} HID_ReportItem_t;
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/** Type define for a complete processed HID report, including all report item data and collections. */
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typedef struct
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{
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uint8_t TotalReportItems; /**< Total number of report items stored in the
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* ReportItems array. */
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HID_ReportItem_t ReportItems[HID_MAX_REPORTITEMS]; /**< Report items array, including
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* all IN, OUT and FEATURE items. */
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HID_CollectionPath_t CollectionPaths[HID_MAX_COLLECTIONS]; /**< All collection items, referenced
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* by the report items. */
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} HID_ReportInfo_t;
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/* Function Prototypes: */
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/** Function to process a given HID report returned from an attached device, and store it into a given
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* HID_ReportInfo_t structure.
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*
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* \param ReportData Buffer containing the device's HID report table
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* \param ReportSize Size in bytes of the HID report table
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* \param ParserData Pointer to a HID_ReportInfo_t instance for the parser output
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*
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* \return A value in the HID_Parse_ErrorCodes_t enum
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*/
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uint8_t ProcessHIDReport(const uint8_t* ReportData, uint16_t ReportSize, HID_ReportInfo_t* const ParserData)
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ATTR_NON_NULL_PTR_ARG(1, 3);
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/** Extracts the given report item's value out of the given HID report and places it into the Value
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* member of the report item's HID_ReportItem_t structure.
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*
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* \param ReportData Buffer containing an IN or FEATURE report from an attached device
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* \param ReportItem Pointer to the report item of interest in a HID_ReportInfo_t ReportItem array
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*
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* \returns Boolean true if the item to retrieve was located in the given report, false otherwise
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*/
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bool GetReportItemInfo(const uint8_t* ReportData, HID_ReportItem_t* const ReportItem)
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ATTR_NON_NULL_PTR_ARG(1, 2);
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/** Retreives the given report item's value out of the Value member of the report item's
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* HID_ReportItem_t structure and places it into the correct position in the HID report
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* buffer. The report buffer is assumed to have the appropriate bits cleared before calling
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* this function (i.e., the buffer should be explicitly cleared before report values are added).
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*
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* If the device has multiple HID reports, the report ID is set to the report ID of the given item.
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*
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* \param ReportData Buffer holding the current OUT report data
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* \param ReportItem Pointer to the report item of interest in a HID_ReportInfo_t ReportItem array
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*/
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void SetReportItemInfo(uint8_t* ReportData, const HID_ReportItem_t* ReportItem)
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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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/* Type Defines: */
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typedef struct
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{
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HID_ReportItem_Attributes_t Attributes;
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uint8_t ReportCount;
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uint8_t ReportID;
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} HID_StateTable_t;
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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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