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author | Jack Humbert <jack.humb@gmail.com> | 2017-07-07 15:33:29 -0400 |
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committer | GitHub <noreply@github.com> | 2017-07-07 15:33:29 -0400 |
commit | 9de443cbf10ac41bc15762c9c83f138f51dd3b9a (patch) | |
tree | d8ddcb428e0b7d9773a1e52c42b60bdca2658beb /lib/lufa/LUFA/Drivers/USB/Class/Common/HIDParser.h | |
parent | 88b3d051b21cb1ddacc6353c5d59b19f03f3a242 (diff) | |
parent | 1c26468ad5a0701e244c99cbcbc547c93b75d515 (diff) | |
download | firmware-9de443cbf10ac41bc15762c9c83f138f51dd3b9a.tar.gz firmware-9de443cbf10ac41bc15762c9c83f138f51dd3b9a.tar.bz2 firmware-9de443cbf10ac41bc15762c9c83f138f51dd3b9a.zip |
Merge pull request #1471 from qmk/lufa_lib
Update LUFA and move it to /lib/lufa
Diffstat (limited to 'lib/lufa/LUFA/Drivers/USB/Class/Common/HIDParser.h')
-rw-r--r-- | lib/lufa/LUFA/Drivers/USB/Class/Common/HIDParser.h | 364 |
1 files changed, 364 insertions, 0 deletions
diff --git a/lib/lufa/LUFA/Drivers/USB/Class/Common/HIDParser.h b/lib/lufa/LUFA/Drivers/USB/Class/Common/HIDParser.h new file mode 100644 index 000000000..023316d7e --- /dev/null +++ b/lib/lufa/LUFA/Drivers/USB/Class/Common/HIDParser.h @@ -0,0 +1,364 @@ +/* + LUFA Library + Copyright (C) Dean Camera, 2017. + + dean [at] fourwalledcubicle [dot] com + www.lufa-lib.org +*/ + +/* + Copyright 2017 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 disclaims 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 USB Human Interface Device (HID) Class report descriptor parser. + * + * This file allows for the easy parsing of complex HID report descriptors, which describes the data that + * a HID device transmits to the host. It also provides an easy API for extracting and processing the data + * elements inside a HID report sent from an attached HID device. + */ + +/** \ingroup Group_USB + * \defgroup Group_HIDParser HID Report Parser + * \brief USB Human Interface Device (HID) Class report descriptor parser. + * + * \section Sec_HIDParser_Dependencies Module Source Dependencies + * The following files must be built with any user project that uses this module: + * - LUFA/Drivers/USB/Class/Host/HIDParser.c <i>(Makefile source module name: LUFA_SRC_USB)</i> + * + * \section Sec_HIDParser_ModDescription Module Description + * Human Interface Device (HID) class report descriptor parser. This module implements a parser than is + * capable of processing a complete HID report descriptor, and outputting a flat structure containing the + * contents of the report in an a more friendly format. The parsed data may then be further processed and used + * within an application to process sent and received HID reports to and from an attached HID device. + * + * A HID report descriptor consists of a set of HID report items, which describe the function and layout + * of data exchanged between a HID device and a host, including both the physical encoding of each item + * (such as a button, key press or joystick axis) in the sent and received data packets - known as "reports" - + * as well as other information about each item such as the usages, data range, physical location and other + * characteristics. In this way a HID device can retain a high degree of flexibility in its capabilities, as it + * is not forced to comply with a given report layout or feature-set. + * + * This module also contains routines for the processing of data in an actual HID report, using the parsed report + * descriptor data as a guide for the encoding. + * + * @{ + */ + +#ifndef __HIDPARSER_H__ +#define __HIDPARSER_H__ + + /* Includes: */ + #include "../../../../Common/Common.h" + + #include "HIDReportData.h" + #include "HIDClassCommon.h" + + /* Enable C linkage for C++ Compilers: */ + #if defined(__cplusplus) + extern "C" { + #endif + + /* Macros: */ + #if !defined(HID_STATETABLE_STACK_DEPTH) || defined(__DOXYGEN__) + /** Constant indicating the maximum stack depth of the state table. A larger state table + * allows for more PUSH/POP report items to be nested, but consumes more memory. By default + * this is set to 2 levels (allowing non-nested PUSH items) but this can be overridden by + * defining \c HID_STATETABLE_STACK_DEPTH to another value in the user project makefile, passing the + * define to the compiler using the -D compiler switch. + */ + #define HID_STATETABLE_STACK_DEPTH 2 + #endif + + #if !defined(HID_USAGE_STACK_DEPTH) || defined(__DOXYGEN__) + /** Constant indicating the maximum stack depth of the usage table. A larger usage table + * allows for more USAGE items to be indicated sequentially for REPORT COUNT entries of more than + * one, but requires more stack space. By default this is set to 8 levels (allowing for a report + * item with a count of 8) but this can be overridden by defining \c HID_USAGE_STACK_DEPTH to another + * value in the user project makefile, passing the define to the compiler using the -D compiler + * switch. + */ + #define HID_USAGE_STACK_DEPTH 8 + #endif + + #if !defined(HID_MAX_COLLECTIONS) || defined(__DOXYGEN__) + /** Constant indicating the maximum number of COLLECTION items (nested or unnested) that can be + * processed in the report item descriptor. A large value allows for more COLLECTION items to be + * processed, but consumes more memory. By default this is set to 10 collections, but this can be + * overridden by defining \c HID_MAX_COLLECTIONS to another value in the user project makefile, passing + * the define to the compiler using the -D compiler switch. + */ + #define HID_MAX_COLLECTIONS 10 + #endif + + #if !defined(HID_MAX_REPORTITEMS) || defined(__DOXYGEN__) + /** Constant indicating the maximum number of report items (IN, OUT or FEATURE) that can be processed + * in the report item descriptor and stored in the user HID Report Info structure. A large value allows + * for more report items to be stored, but consumes more memory. By default this is set to 20 items, + * but this can be overridden by defining \c HID_MAX_REPORTITEMS to another value in the user project + * makefile, and passing the define to the compiler using the -D compiler switch. + */ + #define HID_MAX_REPORTITEMS 20 + #endif + + #if !defined(HID_MAX_REPORT_IDS) || defined(__DOXYGEN__) + /** Constant indicating the maximum number of unique report IDs that can be processed in the report item + * descriptor for the report size information array in the user HID Report Info structure. A large value + * allows for more report ID report sizes to be stored, but consumes more memory. By default this is set + * to 10 items, but this can be overridden by defining \c HID_MAX_REPORT_IDS to another value in the user project + * makefile, and passing the define to the compiler using the -D compiler switch. Note that IN, OUT and FEATURE + * items sharing the same report ID consume only one size item in the array. + */ + #define HID_MAX_REPORT_IDS 10 + #endif + + /** Returns the value a given HID report item (once its value has been fetched via \ref USB_GetHIDReportItemInfo()) + * left-aligned to the given data type. This allows for signed data to be interpreted correctly, by shifting the data + * leftwards until the data's sign bit is in the correct position. + * + * \param[in] ReportItem HID Report Item whose retrieved value is to be aligned. + * \param[in] Type Data type to align the HID report item's value to. + * + * \return Left-aligned data of the given report item's pre-retrieved value for the given datatype. + */ + #define HID_ALIGN_DATA(ReportItem, Type) ((Type)(ReportItem->Value << ((8 * sizeof(Type)) - ReportItem->Attributes.BitSize))) + + /* Public Interface - May be used in end-application: */ + /* Enums: */ + /** Enum for the possible error codes in the return value of the \ref USB_ProcessHIDReport() function. */ + enum HID_Parse_ErrorCodes_t + { + HID_PARSE_Successful = 0, /**< Successful parse of the HID report descriptor, no error. */ + HID_PARSE_HIDStackOverflow = 1, /**< More than \ref HID_STATETABLE_STACK_DEPTH nested PUSHes in the report. */ + HID_PARSE_HIDStackUnderflow = 2, /**< A POP was found when the state table stack was empty. */ + HID_PARSE_InsufficientReportItems = 3, /**< More than \ref HID_MAX_REPORTITEMS report items in the report. */ + HID_PARSE_UnexpectedEndCollection = 4, /**< An END COLLECTION item found without matching COLLECTION item. */ + HID_PARSE_InsufficientCollectionPaths = 5, /**< More than \ref HID_MAX_COLLECTIONS collections in the report. */ + HID_PARSE_UsageListOverflow = 6, /**< More than \ref HID_USAGE_STACK_DEPTH usages listed in a row. */ + HID_PARSE_InsufficientReportIDItems = 7, /**< More than \ref HID_MAX_REPORT_IDS report IDs in the device. */ + HID_PARSE_NoUnfilteredReportItems = 8, /**< All report items from the device were filtered by the filtering callback routine. */ + }; + + /* Type Defines: */ + /** \brief HID Parser Report Item Min/Max Structure. + * + * Type define for an attribute with both minimum and maximum values (e.g. Logical Min/Max). + */ + typedef struct + { + uint32_t Minimum; /**< Minimum value for the attribute. */ + uint32_t Maximum; /**< Maximum value for the attribute. */ + } HID_MinMax_t; + + /** \brief HID Parser Report Item Unit Structure. + * + * Type define for the Unit attributes of a report item. + */ + typedef struct + { + uint32_t Type; /**< Unit type (refer to HID specifications for details). */ + uint8_t Exponent; /**< Unit exponent (refer to HID specifications for details). */ + } HID_Unit_t; + + /** \brief HID Parser Report Item Usage Structure. + * + * Type define for the Usage attributes of a report item. + */ + typedef struct + { + uint16_t Page; /**< Usage page of the report item. */ + uint16_t Usage; /**< Usage of the report item. */ + } HID_Usage_t; + + /** \brief HID Parser Report Item Collection Path Structure. + * + * Type define for a COLLECTION object. Contains the collection attributes and a reference to the + * parent collection if any. + */ + typedef struct HID_CollectionPath + { + uint8_t Type; /**< Collection type (e.g. "Generic Desktop"). */ + HID_Usage_t Usage; /**< Collection usage. */ + struct HID_CollectionPath* Parent; /**< Reference to parent collection, or \c NULL if root collection. */ + } HID_CollectionPath_t; + + /** \brief HID Parser Report Item Attributes Structure. + * + * Type define for all the data attributes of a report item, except flags. + */ + typedef struct + { + uint8_t BitSize; /**< Size in bits of the report item's data. */ + + HID_Usage_t Usage; /**< Usage of the report item. */ + HID_Unit_t Unit; /**< Unit type and exponent of the report item. */ + HID_MinMax_t Logical; /**< Logical minimum and maximum of the report item. */ + HID_MinMax_t Physical; /**< Physical minimum and maximum of the report item. */ + } HID_ReportItem_Attributes_t; + + /** \brief HID Parser Report Item Details Structure. + * + * Type define for a report item (IN, OUT or FEATURE) layout attributes and other details. + */ + typedef struct + { + uint16_t BitOffset; /**< Bit offset in the IN, OUT or FEATURE report of the item. */ + uint8_t ItemType; /**< Report item type, a value in \ref HID_ReportItemTypes_t. */ + uint16_t ItemFlags; /**< Item data flags, a mask of \c HID_IOF_* constants. */ + uint8_t ReportID; /**< Report ID this item belongs to, or 0x00 if device has only one report */ + HID_CollectionPath_t* CollectionPath; /**< Collection path of the item. */ + + HID_ReportItem_Attributes_t Attributes; /**< Report item attributes. */ + + uint32_t Value; /**< Current value of the report item - use \ref HID_ALIGN_DATA() when processing + * a retrieved value so that it is aligned to a specific type. + */ + uint32_t PreviousValue; /**< Previous value of the report item. */ + } HID_ReportItem_t; + + /** \brief HID Parser Report Size Structure. + * + * Type define for a report item size information structure, to retain the size of a device's reports by ID. + */ + typedef struct + { + uint8_t ReportID; /**< Report ID of the report within the HID interface. */ + uint16_t ReportSizeBits[3]; /**< Total number of bits in each report type for the given Report ID, + * indexed by the \ref HID_ReportItemTypes_t enum. + */ + } HID_ReportSizeInfo_t; + + /** \brief HID Parser State Structure. + * + * Type define for a complete processed HID report, including all report item data and collections. + */ + typedef struct + { + uint8_t TotalReportItems; /**< Total number of report items stored in the \c ReportItems array. */ + HID_ReportItem_t ReportItems[HID_MAX_REPORTITEMS]; /**< Report items array, including all IN, OUT + * and FEATURE items. + */ + HID_CollectionPath_t CollectionPaths[HID_MAX_COLLECTIONS]; /**< All collection items, referenced + * by the report items. + */ + uint8_t TotalDeviceReports; /**< Number of reports within the HID interface */ + HID_ReportSizeInfo_t ReportIDSizes[HID_MAX_REPORT_IDS]; /**< Report sizes for each report in the interface */ + uint16_t LargestReportSizeBits; /**< Largest report that the attached device will generate, in bits */ + bool UsingReportIDs; /**< Indicates if the device has at least one REPORT ID + * element in its HID report descriptor. + */ + } HID_ReportInfo_t; + + /* Function Prototypes: */ + /** Function to process a given HID report returned from an attached device, and store it into a given + * \ref HID_ReportInfo_t structure. + * + * \param[in] ReportData Buffer containing the device's HID report table. + * \param[in] ReportSize Size in bytes of the HID report table. + * \param[out] ParserData Pointer to a \ref HID_ReportInfo_t instance for the parser output. + * + * \return A value in the \ref HID_Parse_ErrorCodes_t enum. + */ + uint8_t USB_ProcessHIDReport(const uint8_t* ReportData, + uint16_t ReportSize, + HID_ReportInfo_t* const ParserData) ATTR_NON_NULL_PTR_ARG(1) ATTR_NON_NULL_PTR_ARG(3); + + /** Extracts the given report item's value out of the given HID report and places it into the Value + * member of the report item's \ref HID_ReportItem_t structure. + * + * When called on a report with an item that exists in that report, this copies the report item's \c Value + * to its \c PreviousValue element for easy checking to see if an item's value has changed before processing + * a report. If the given item does not exist in the report, the function does not modify the report item's + * data. + * + * \param[in] ReportData Buffer containing an IN or FEATURE report from an attached device. + * \param[in,out] ReportItem Pointer to the report item of interest in a \ref HID_ReportInfo_t ReportItem array. + * + * \returns Boolean \c true if the item to retrieve was located in the given report, \c false otherwise. + */ + bool USB_GetHIDReportItemInfo(const uint8_t* ReportData, + HID_ReportItem_t* const ReportItem) ATTR_NON_NULL_PTR_ARG(1); + + /** Retrieves the given report item's value out of the \c Value member of the report item's + * \ref HID_ReportItem_t structure and places it into the correct position in the HID report + * buffer. The report buffer is assumed to have the appropriate bits cleared before calling + * this function (i.e., the buffer should be explicitly cleared before report values are added). + * + * When called, this copies the report item's \c Value element to its \c PreviousValue element for easy + * checking to see if an item's value has changed before sending a report. + * + * If the device has multiple HID reports, the first byte in the report is set to the report ID of the given item. + * + * \param[out] ReportData Buffer holding the current OUT or FEATURE report data. + * \param[in] ReportItem Pointer to the report item of interest in a \ref HID_ReportInfo_t ReportItem array. + */ + void USB_SetHIDReportItemInfo(uint8_t* ReportData, + HID_ReportItem_t* const ReportItem) ATTR_NON_NULL_PTR_ARG(1); + + /** Retrieves the size of a given HID report in bytes from its Report ID. + * + * \param[in] ParserData Pointer to a \ref HID_ReportInfo_t instance containing the parser output. + * \param[in] ReportID Report ID of the report whose size is to be determined. + * \param[in] ReportType Type of the report whose size is to be determined, a value from the + * \ref HID_ReportItemTypes_t enum. + * + * \return Size of the report in bytes, or \c 0 if the report does not exist. + */ + uint16_t USB_GetHIDReportSize(HID_ReportInfo_t* const ParserData, + const uint8_t ReportID, + const uint8_t ReportType) ATTR_CONST ATTR_NON_NULL_PTR_ARG(1); + + /** Callback routine for the HID Report Parser. This callback <b>must</b> be implemented by the user code when + * the parser is used, to determine what report IN, OUT and FEATURE item's information is stored into the user + * \ref HID_ReportInfo_t structure. This can be used to filter only those items the application will be using, so that + * no RAM is wasted storing the attributes for report items which will never be referenced by the application. + * + * Report item pointers passed to this callback function may be cached by the user application for later use + * when processing report items. This provides faster report processing in the user application than would + * a search of the entire parsed report item table for each received or sent report. + * + * \param[in] CurrentItem Pointer to the current report item for user checking. + * + * \return Boolean \c true if the item should be stored into the \ref HID_ReportInfo_t structure, \c false if + * it should be ignored. + */ + bool CALLBACK_HIDParser_FilterHIDReportItem(HID_ReportItem_t* const CurrentItem); + + /* Private Interface - For use in library only: */ + #if !defined(__DOXYGEN__) + /* Type Defines: */ + typedef struct + { + HID_ReportItem_Attributes_t Attributes; + uint8_t ReportCount; + uint8_t ReportID; + } HID_StateTable_t; + #endif + + /* Disable C linkage for C++ Compilers: */ + #if defined(__cplusplus) + } + #endif + +#endif + +/** @} */ + |