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357 lines
18 KiB
357 lines
18 KiB
/* |
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LUFA Library |
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Copyright (C) Dean Camera, 2010. |
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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 2010 Dean Camera (dean [at] fourwalledcubicle [dot] com) |
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Permission to use, copy, modify, distribute, and sell this |
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software and its documentation for any purpose is hereby granted |
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without fee, provided that the above copyright notice appear in |
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all 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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* \brief USB Human Interface Device (HID) Class report descriptor parser. |
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* |
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* This file allows for the easy parsing of complex HID report descriptors, which describes the data that |
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* a HID device transmits to the host. It also provides an easy API for extracting and processing the data |
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* elements inside a HID report sent from an attached HID device. |
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*/ |
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/** \ingroup Group_USB |
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* @defgroup Group_HIDParser HID Report Parser |
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* |
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* \section Sec_Dependencies Module Source Dependencies |
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* The following files must be built with any user project that uses this module: |
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* - LUFA/Drivers/USB/Class/Host/HIDParser.c <i>(Makefile source module name: LUFA_SRC_USB)</i> |
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* |
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* \section Module Description |
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* Functions, macros, variables, enums and types related to the parsing of HID class device report descriptors. |
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* |
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* The processed HID 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 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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* @{ |
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*/ |
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#ifndef __HIDPARSER_H__ |
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#define __HIDPARSER_H__ |
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/* Macros: */ |
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#define __INCLUDE_FROM_USB_DRIVER |
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#define __INCLUDE_FROM_HID_DRIVER |
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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/HID.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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/* Macros: */ |
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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 2 levels (allowing non-nested PUSH items) 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 2 |
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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 10 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 10 |
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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) that can be processed |
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* in the report item descriptor and stored in the user HID Report Info structure. A large value allows |
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* for more report items to be stored, but consumes more memory. By default this is set to 20 items, |
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* but this can be overridden by defining HID_MAX_REPORTITEMS to another value in the user project |
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* makefile, and passing the define to the compiler using the -D compiler switch. |
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*/ |
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#define HID_MAX_REPORTITEMS 20 |
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#endif |
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#if !defined(HID_MAX_REPORT_IDS) || defined(__DOXYGEN__) |
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/** Constant indicating the maximum number of unique report IDs that can be processed in the report item |
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* descriptor for the report size information array in the user HID Report Info structure. A large value |
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* allows for more report ID report sizes to be stored, but consumes more memory. By default this is set |
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* to 10 items, but this can be overridden by defining HID_MAX_REPORT_IDS to another value in the user project |
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* makefile, and passing the define to the compiler using the -D compiler switch. Note that IN, OUT and FEATURE |
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* items sharing the same report ID consume only one size item in the array. |
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*/ |
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#define HID_MAX_REPORT_IDS 10 |
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#endif |
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/** Returns the value a given HID report item (once its value has been fetched via \ref USB_GetHIDReportItemInfo()) |
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* left-aligned to the given data type. This allows for signed data to be interpreted correctly, by shifting the data |
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* leftwards until the data's sign bit is in the correct position. |
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* |
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* \param[in] ReportItem HID Report Item whose retrieved value is to be aligned. |
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* \param[in] Type Data type to align the HID report item's value to. |
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* |
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* \return Left-aligned data of the given report item's pre-retrieved value for the given datatype. |
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*/ |
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#define HID_ALIGN_DATA(ReportItem, Type) ((Type)(ReportItem->Value << ((8 * sizeof(Type)) - ReportItem->Attributes.BitSize))) |
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/* Public Interface - May be used in end-application: */ |
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/* Enums: */ |
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/** Enum for the possible error codes in the return value of the \ref USB_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 \ref 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 \ref HID_MAX_REPORTITEMS report items in the report. */ |
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HID_PARSE_UnexpectedEndCollection = 4, /**< An END COLLECTION item found without matching COLLECTION item. */ |
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HID_PARSE_InsufficientCollectionPaths = 5, /**< More than \ref HID_MAX_COLLECTIONS collections in the report. */ |
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HID_PARSE_UsageListOverflow = 6, /**< More than \ref HID_USAGE_STACK_DEPTH usages listed in a row. */ |
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HID_PARSE_InsufficientReportIDItems = 7, /**< More than \ref HID_MAX_REPORT_IDS report IDs in the device. */ |
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HID_PARSE_NoUnfilteredReportItems = 8, /**< All report items from the device were filtered by the filtering callback routine. */ |
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}; |
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/* Type Defines: */ |
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/** \brief HID Parser Report Item Min/Max Structure. |
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* |
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* Type define for an attribute with both minimum and maximum values (e.g. Logical Min/Max). |
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*/ |
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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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/** \brief HID Parser Report Item Unit Structure. |
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* |
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* Type define for the Unit attributes of a report item. |
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*/ |
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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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/** \brief HID Parser Report Item Usage Structure. |
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* |
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* Type define for the Usage attributes of a report item. |
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*/ |
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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_Usage_t; |
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/** \brief HID Parser Report Item Collection Path Structure. |
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* |
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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 (e.g. "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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/** \brief HID Parser Report Item Attributes Structure. |
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* |
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* Type define for all the data attributes of a report item, except flags. |
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*/ |
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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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/** \brief HID Parser Report Item Details Structure. |
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* |
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* Type define for a report item (IN, OUT or FEATURE) layout attributes and other details. |
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*/ |
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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_ReportItemTypes_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 - use \ref HID_ALIGN_DATA() when processing |
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* a retrieved value so that it is aligned to a specific type. |
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*/ |
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uint32_t PreviousValue; /**< Previous value of the report item. */ |
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} HID_ReportItem_t; |
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/** \brief HID Parser Report Size Structure. |
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* |
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* Type define for a report item size information structure, to retain the size of a device's reports by ID. |
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*/ |
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typedef struct |
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{ |
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uint8_t ReportID; /**< Report ID of the report within the HID interface. */ |
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uint16_t ReportSizeBits[3]; /**< Total number of bits in each report type for the given Report ID, |
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* indexed by the \ref HID_ReportItemTypes_t enum. |
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*/ |
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} HID_ReportSizeInfo_t; |
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/** \brief HID Parser State Structure. |
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* |
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* Type define for a complete processed HID report, including all report item data and collections. |
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*/ |
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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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*/ |
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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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*/ |
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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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*/ |
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uint8_t TotalDeviceReports; /**< Number of reports within the HID interface */ |
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HID_ReportSizeInfo_t ReportIDSizes[HID_MAX_REPORT_IDS]; /**< Report sizes for each report in the interface */ |
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uint16_t LargestReportSizeBits; /**< Largest report that the attached device will generate, in bits */ |
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bool UsingReportIDs; /**< Indicates if the device has at least one REPORT ID |
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* element in its HID report descriptor. |
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*/ |
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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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* \ref HID_ReportInfo_t structure. |
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* |
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* \param[in] ReportData Buffer containing the device's HID report table. |
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* \param[in] ReportSize Size in bytes of the HID report table. |
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* \param[out] ParserData Pointer to a \ref HID_ReportInfo_t instance for the parser output. |
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* |
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* \return A value in the \ref HID_Parse_ErrorCodes_t enum. |
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*/ |
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uint8_t USB_ProcessHIDReport(const uint8_t* ReportData, |
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uint16_t ReportSize, |
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HID_ReportInfo_t* const ParserData) ATTR_NON_NULL_PTR_ARG(1) ATTR_NON_NULL_PTR_ARG(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 \ref HID_ReportItem_t structure. |
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* |
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* When called, this copies the report item's Value element to it's PreviousValue element for easy |
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* checking to see if an item's value has changed before processing a report. |
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* |
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* \param[in] ReportData Buffer containing an IN or FEATURE report from an attached device. |
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* \param[in,out] ReportItem Pointer to the report item of interest in a \ref 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 USB_GetHIDReportItemInfo(const uint8_t* ReportData, |
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HID_ReportItem_t* const ReportItem) ATTR_NON_NULL_PTR_ARG(1) ATTR_NON_NULL_PTR_ARG(2); |
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/** Retrieves the given report item's value out of the Value member of the report item's |
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* \ref 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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* When called, this copies the report item's Value element to it's PreviousValue element for easy |
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* checking to see if an item's value has changed before sending a report. |
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* |
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* If the device has multiple HID reports, the first byte in the report is set to the report ID of the given item. |
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* |
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* \param[out] ReportData Buffer holding the current OUT or FEATURE report data. |
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* \param[in] ReportItem Pointer to the report item of interest in a \ref HID_ReportInfo_t ReportItem array. |
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*/ |
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void USB_SetHIDReportItemInfo(uint8_t* ReportData, |
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HID_ReportItem_t* const ReportItem) ATTR_NON_NULL_PTR_ARG(1) ATTR_NON_NULL_PTR_ARG(2); |
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/** Retrieves the size of a given HID report in bytes from it's Report ID. |
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* |
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* \param[in] ParserData Pointer to a \ref HID_ReportInfo_t instance containing the parser output. |
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* \param[in] ReportID Report ID of the report whose size is to be retrieved. |
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* \param[in] ReportType Type of the report whose size is to be determined, a valued from the |
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* \ref HID_ReportItemTypes_t enum. |
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* |
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* \return Size of the report in bytes, or 0 if the report does not exist. |
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*/ |
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uint16_t USB_GetHIDReportSize(HID_ReportInfo_t* const ParserData, |
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const uint8_t ReportID, |
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const uint8_t ReportType) ATTR_CONST ATTR_NON_NULL_PTR_ARG(1); |
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/** Callback routine for the HID Report Parser. This callback <b>must</b> be implemented by the user code when |
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* the parser is used, to determine what report IN, OUT and FEATURE item's information is stored into the user |
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* HID_ReportInfo_t structure. This can be used to filter only those items the application will be using, so that |
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* no RAM is wasted storing the attributes for report items which will never be referenced by the application. |
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* |
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* \param[in] CurrentItem Pointer to the current report item for user checking. |
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* |
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* \return Boolean true if the item should be stored into the HID_ReportInfo_t structure, false if it should be ignored. |
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*/ |
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bool CALLBACK_HIDParser_FilterHIDReportItem(HID_ReportItem_t* const CurrentItem); |
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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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/** @} */
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