qmk_firmware/LUFA/Drivers/USB/Class/Device/HID.c

/*
             LUFA Library
     Copyright (C) Dean Camera, 2010.
              
  dean [at] fourwalledcubicle [dot] com
      www.fourwalledcubicle.com
*/

/*
  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.
*/

#define  __INCLUDE_FROM_USB_DRIVER
#include "../../HighLevel/USBMode.h"
#if defined(USB_CAN_BE_DEVICE)

#define  __INCLUDE_FROM_HID_DRIVER
#include "HID.h"

void HID_Device_ProcessControlRequest(USB_ClassInfo_HID_Device_t* const HIDInterfaceInfo)
{
	if (!(Endpoint_IsSETUPReceived()))
	  return;
	  
	if (USB_ControlRequest.wIndex != HIDInterfaceInfo->Config.InterfaceNumber)
	  return;

	switch (USB_ControlRequest.bRequest)
	{
		case REQ_GetReport:
			if (USB_ControlRequest.bmRequestType == (REQDIR_DEVICETOHOST | REQTYPE_CLASS | REQREC_INTERFACE))
			{
				Endpoint_ClearSETUP();	

				uint16_t ReportINSize = 0;
				uint8_t  ReportID     = (USB_ControlRequest.wValue & 0xFF);
				uint8_t  ReportType   = (USB_ControlRequest.wValue >> 8) - 1;
				uint8_t  ReportINData[HIDInterfaceInfo->Config.PrevReportINBufferSize];

				memset(ReportINData, 0, sizeof(ReportINData));

				CALLBACK_HID_Device_CreateHIDReport(HIDInterfaceInfo, &ReportID, ReportType,
				                                    HIDInterfaceInfo->Config.PrevReportINBuffer, &ReportINSize);
				
				if (HIDInterfaceInfo->Config.PrevReportINBuffer != NULL)
				  memcpy(HIDInterfaceInfo->Config.PrevReportINBuffer, ReportINData, HIDInterfaceInfo->Config.PrevReportINBufferSize);

				Endpoint_SelectEndpoint(ENDPOINT_CONTROLEP);
				Endpoint_Write_Control_Stream_LE(HIDInterfaceInfo->Config.PrevReportINBuffer, ReportINSize);
				Endpoint_ClearOUT();
			}
		
			break;
		case REQ_SetReport:
			if (USB_ControlRequest.bmRequestType == (REQDIR_HOSTTODEVICE | REQTYPE_CLASS | REQREC_INTERFACE))
			{
				Endpoint_ClearSETUP();
				
				uint16_t ReportOUTSize = USB_ControlRequest.wLength;
				uint8_t  ReportOUTData[ReportOUTSize];
				uint8_t  ReportID = (USB_ControlRequest.wValue & 0xFF);

				Endpoint_Read_Control_Stream_LE(ReportOUTData, ReportOUTSize);
				Endpoint_ClearIN();
				
				CALLBACK_HID_Device_ProcessHIDReport(HIDInterfaceInfo, ReportID, ReportOUTData, ReportOUTSize);
			}
			
			break;
		case REQ_GetProtocol:
			if (USB_ControlRequest.bmRequestType == (REQDIR_DEVICETOHOST | REQTYPE_CLASS | REQREC_INTERFACE))
			{
				Endpoint_ClearSETUP();

				Endpoint_Write_Byte(HIDInterfaceInfo->State.UsingReportProtocol);
				Endpoint_ClearIN();

				Endpoint_ClearStatusStage();
			}
			
			break;
		case REQ_SetProtocol:
			if (USB_ControlRequest.bmRequestType == (REQDIR_HOSTTODEVICE | REQTYPE_CLASS | REQREC_INTERFACE))
			{
				Endpoint_ClearSETUP();

				HIDInterfaceInfo->State.UsingReportProtocol = ((USB_ControlRequest.wValue & 0xFF) != 0x00);
				
				Endpoint_ClearStatusStage();
			}
			
			break;
		case REQ_SetIdle:
			if (USB_ControlRequest.bmRequestType == (REQDIR_HOSTTODEVICE | REQTYPE_CLASS | REQREC_INTERFACE))
			{
				Endpoint_ClearSETUP();
					
				HIDInterfaceInfo->State.IdleCount = ((USB_ControlRequest.wValue & 0xFF00) >> 6);
					
				Endpoint_ClearStatusStage();
			}
			
			break;
		case REQ_GetIdle:
			if (USB_ControlRequest.bmRequestType == (REQDIR_DEVICETOHOST | REQTYPE_CLASS | REQREC_INTERFACE))
			{		
				Endpoint_ClearSETUP();
				
				Endpoint_Write_Byte(HIDInterfaceInfo->State.IdleCount >> 2);
				Endpoint_ClearIN();

				Endpoint_ClearStatusStage();
			}

			break;
	}
}

bool HID_Device_ConfigureEndpoints(USB_ClassInfo_HID_Device_t* const HIDInterfaceInfo)
{
	memset(&HIDInterfaceInfo->State, 0x00, sizeof(HIDInterfaceInfo->State));
	HIDInterfaceInfo->State.UsingReportProtocol = true;
	HIDInterfaceInfo->State.IdleCount = 500;

	if (!(Endpoint_ConfigureEndpoint(HIDInterfaceInfo->Config.ReportINEndpointNumber, EP_TYPE_INTERRUPT,
									 ENDPOINT_DIR_IN, HIDInterfaceInfo->Config.ReportINEndpointSize,
									 HIDInterfaceInfo->Config.ReportINEndpointDoubleBank ? ENDPOINT_BANK_DOUBLE : ENDPOINT_BANK_SINGLE)))
	{
		return false;
	}
	
	return true;
}
		
void HID_Device_USBTask(USB_ClassInfo_HID_Device_t* const HIDInterfaceInfo)
{
	if (USB_DeviceState != DEVICE_STATE_Configured)
	  return;

	Endpoint_SelectEndpoint(HIDInterfaceInfo->Config.ReportINEndpointNumber);
	
	if (Endpoint_IsReadWriteAllowed())
	{
		uint8_t  ReportINData[HIDInterfaceInfo->Config.PrevReportINBufferSize];
		uint8_t  ReportID     = 0;
		uint16_t ReportINSize = 0;

		memset(ReportINData, 0, sizeof(ReportINData));

		bool ForceSend         = CALLBACK_HID_Device_CreateHIDReport(HIDInterfaceInfo, &ReportID, REPORT_ITEM_TYPE_In,
		                                                             ReportINData, &ReportINSize);
		bool StatesChanged     = false;
		bool IdlePeriodElapsed = (HIDInterfaceInfo->State.IdleCount && !(HIDInterfaceInfo->State.IdleMSRemaining));
		
		if (HIDInterfaceInfo->Config.PrevReportINBuffer != NULL)
		{
			StatesChanged = (memcmp(ReportINData, HIDInterfaceInfo->Config.PrevReportINBuffer, ReportINSize) != 0);
			memcpy(HIDInterfaceInfo->Config.PrevReportINBuffer, ReportINData, HIDInterfaceInfo->Config.PrevReportINBufferSize);
		}

		if (ReportINSize && (ForceSend || StatesChanged || IdlePeriodElapsed))
		{
			HIDInterfaceInfo->State.IdleMSRemaining = HIDInterfaceInfo->State.IdleCount;

			Endpoint_SelectEndpoint(HIDInterfaceInfo->Config.ReportINEndpointNumber);

			if (ReportID)
			  Endpoint_Write_Byte(ReportID);

			Endpoint_Write_Stream_LE(ReportINData, ReportINSize, NO_STREAM_CALLBACK);
			
			Endpoint_ClearIN();
		}
	}
}

#endif