112 lines
4.3 KiB
C
112 lines
4.3 KiB
C
/*
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LUFA Library
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Copyright (C) Dean Camera, 2017.
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dean [at] fourwalledcubicle [dot] com
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www.lufa-lib.org
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*/
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/*
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Copyright 2017 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 disclaims 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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#include "HIDReport.h"
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/** Size in bytes of the attached device's HID report descriptor */
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uint16_t HIDReportSize;
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/** Processed HID report descriptor items structure, containing information on each HID report element */
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HID_ReportInfo_t HIDReportInfo;
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/** Function to read in the HID report descriptor from the attached device, and process it into easy-to-read
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* structures via the HID parser routines in the LUFA library.
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*
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* \return A value from the \ref JoystickHostWithParser_GetHIDReportDataCodes_t enum
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*/
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uint8_t GetHIDReportData(void)
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{
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/* Create a buffer big enough to hold the entire returned HID report */
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uint8_t HIDReportData[HIDReportSize];
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USB_ControlRequest = (USB_Request_Header_t)
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{
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.bmRequestType = (REQDIR_DEVICETOHOST | REQTYPE_STANDARD | REQREC_INTERFACE),
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.bRequest = REQ_GetDescriptor,
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.wValue = (HID_DTYPE_Report << 8),
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.wIndex = 0,
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.wLength = HIDReportSize,
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};
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/* Select the control pipe for the request transfer */
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Pipe_SelectPipe(PIPE_CONTROLPIPE);
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/* Send control request to retrieve the HID report from the attached device */
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if (USB_Host_SendControlRequest(HIDReportData) != HOST_SENDCONTROL_Successful)
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return ParseControlError;
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/* Send the HID report to the parser for processing */
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if (USB_ProcessHIDReport(HIDReportData, HIDReportSize, &HIDReportInfo) != HID_PARSE_Successful)
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return ParseError;
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return ParseSuccessful;
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}
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/** Callback for the HID Report Parser. This function is called each time the HID report parser is about to store
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* an IN, OUT or FEATURE item into the HIDReportInfo structure. To save on RAM, we are able to filter out items
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* we aren't interested in (preventing us from being able to extract them later on, but saving on the RAM they would
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* have occupied).
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*
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* \param[in] CurrentItem Pointer to the item the HID report parser is currently working with
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*
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* \return Boolean \c true if the item should be stored into the HID report structure, \c false if it should be discarded
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*/
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bool CALLBACK_HIDParser_FilterHIDReportItem(HID_ReportItem_t* const CurrentItem)
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{
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bool IsJoystick = false;
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/* Iterate through the item's collection path, until either the root collection node or a collection with the
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* Joystick Usage is found - this prevents Mice, which use identical descriptors except for the Mouse usage
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* parent node, from being erroneously treated as a joystick
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*/
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for (HID_CollectionPath_t* CurrPath = CurrentItem->CollectionPath; CurrPath != NULL; CurrPath = CurrPath->Parent)
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{
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if ((CurrPath->Usage.Page == USAGE_PAGE_GENERIC_DCTRL) &&
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(CurrPath->Usage.Usage == USAGE_JOYSTICK))
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{
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IsJoystick = true;
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break;
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}
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}
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/* If a collection with the joystick usage was not found, indicate that we are not interested in this item */
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if (!IsJoystick)
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return false;
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/* Check the attributes of the current joystick item - see if we are interested in it or not;
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* only store BUTTON and GENERIC_DESKTOP_CONTROL items into the Processed HID Report
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* structure to save RAM and ignore the rest
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*/
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return ((CurrentItem->Attributes.Usage.Page == USAGE_PAGE_BUTTON) ||
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(CurrentItem->Attributes.Usage.Page == USAGE_PAGE_GENERIC_DCTRL));
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}
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