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Diffstat (limited to 'LUFA/Drivers/USB/Class/Host/HIDParser.h')
| -rw-r--r-- | LUFA/Drivers/USB/Class/Host/HIDParser.h | 356 |
1 files changed, 356 insertions, 0 deletions
diff --git a/LUFA/Drivers/USB/Class/Host/HIDParser.h b/LUFA/Drivers/USB/Class/Host/HIDParser.h new file mode 100644 index 0000000..cb3b98f --- /dev/null +++ b/LUFA/Drivers/USB/Class/Host/HIDParser.h @@ -0,0 +1,356 @@ +/*
+ LUFA Library
+ Copyright (C) Dean Camera, 2010.
+
+ dean [at] fourwalledcubicle [dot] com
+ www.lufa-lib.org
+*/
+
+/*
+ Copyright 2010 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 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
+ *
+ * \section Sec_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 Module Description
+ * Functions, macros, variables, enums and types related to the parsing of HID class device report descriptors.
+ *
+ * The processed HID report is presented back to the user application as a flat structure containing each report
+ * item's IN, OUT and FEATURE items along with each item's attributes.
+ *
+ * This library portion also allows for easy setting and retrieval of data from a HID report, including devices
+ * with multiple reports on the one HID interface.
+ *
+ * @{
+ */
+
+#ifndef __HIDPARSER_H__
+#define __HIDPARSER_H__
+
+ /* Includes: */
+ #include <string.h>
+ #include <stdbool.h>
+
+ #include "HIDReportData.h"
+ #include "../Common/HID.h"
+
+ #include "../../../../Common/Common.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 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 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 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 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 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 CollectionPath
+ {
+ uint8_t Type; /**< Collection type (e.g. "Generic Desktop"). */
+ HID_Usage_t Usage; /**< Collection usage. */
+ struct CollectionPath* Parent; /**< Reference to parent collection, or 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 HID_ReportItemTypes_t. */
+ uint16_t ItemFlags; /**< Item data flags, such as constant/variable, etc. */
+ 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
+ * 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 Value
+ * to it's 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 true if the item to retrieve was located in the given report, false otherwise.
+ */
+ bool USB_GetHIDReportItemInfo(const uint8_t* ReportData,
+ HID_ReportItem_t* const ReportItem) ATTR_NON_NULL_PTR_ARG(1) ATTR_NON_NULL_PTR_ARG(2);
+
+ /** Retrieves the given report item's value out of the 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 Value element to it's 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) ATTR_NON_NULL_PTR_ARG(2);
+
+ /** Retrieves the size of a given HID report in bytes from it's 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 retrieved.
+ * \param[in] ReportType Type of the report whose size is to be determined, a valued from the
+ * \ref HID_ReportItemTypes_t enum.
+ *
+ * \return Size of the report in bytes, or 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
+ * 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.
+ *
+ * \param[in] CurrentItem Pointer to the current report item for user checking.
+ *
+ * \return Boolean true if the item should be stored into the HID_ReportInfo_t structure, 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
+
+/** @} */
+
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