Arduino/hardware/arduino/avr/libraries/HID/HID.cpp

/* Copyright (c) 2015, Arduino LLC
**
** Original code (pre-library): Copyright (c) 2011, Peter Barrett
**
** Permission to use, copy, modify, and/or distribute this software for  
** any purpose with or without fee is hereby granted, provided that the  
** above copyright notice and this permission notice appear in all copies.  
** 
** THE SOFTWARE IS PROVIDED "AS IS" AND 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, DIRECT, 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.  
*/

#include "PluggableUSB.h"
#include "HID.h"

#if defined(USBCON)

HID_ HID;

static uint8_t HID_ENDPOINT_INT;

//================================================================================
//================================================================================
//	HID Interface

static uint8_t HID_INTERFACE;

HIDDescriptor _hidInterface;

static HIDDescriptorListNode* rootNode = NULL;
static uint16_t sizeof_hidReportDescriptor = 0;
static uint8_t modules_count = 0;
static uint8_t epType[] = { EP_TYPE_INTERRUPT_IN };

//================================================================================
//================================================================================
//	Driver

uint8_t _hid_protocol = 1;
uint8_t _hid_idle = 1;

int HID_GetInterface(uint8_t* interfaceNum)
{
	interfaceNum[0] += 1;	// uses 1
	_hidInterface =
	{
		D_INTERFACE(HID_INTERFACE,1,3,0,0),
		D_HIDREPORT(sizeof_hidReportDescriptor),
		D_ENDPOINT(USB_ENDPOINT_IN (HID_ENDPOINT_INT),USB_ENDPOINT_TYPE_INTERRUPT,USB_EP_SIZE,0x01)
	};
	return USB_SendControl(0,&_hidInterface,sizeof(_hidInterface));
}

int HID_GetDescriptor(int8_t t)
{
	if (HID_REPORT_DESCRIPTOR_TYPE == t) {
		HIDDescriptorListNode* current = rootNode;
		int total = 0;
		while(current != NULL) {
			total += USB_SendControl(TRANSFER_PGM,current->data,current->length);
			current = current->next;
		}
		return total;
	} else {
		return 0;
	}
}

void HID_::AppendDescriptor(HIDDescriptorListNode *node)
{
	if (modules_count == 0) {
		rootNode = node;
	} else {
		HIDDescriptorListNode *current = rootNode;
		while(current->next != NULL) {
			current = current->next;
		}
		current->next = node;
	}
	modules_count++;
	sizeof_hidReportDescriptor += (uint16_t)node->length;
}

void HID_::SendReport(u8 id, const void* data, int len)
{
	USB_Send(HID_TX, &id, 1);
	USB_Send(HID_TX | TRANSFER_RELEASE,data,len);
}

bool HID_Setup(USBSetup& setup, uint8_t i)
{
	if (HID_INTERFACE != i) {
		return false;
	} else {
		uint8_t r = setup.bRequest;
		uint8_t requestType = setup.bmRequestType;
		if (REQUEST_DEVICETOHOST_CLASS_INTERFACE == requestType)
		{
			if (HID_GET_REPORT == r)
			{
			//HID_GetReport();
				return true;
			}
			if (HID_GET_PROTOCOL == r)
			{
			//Send8(_hid_protocol);	// TODO
				return true;
			}
		}
		
		if (REQUEST_HOSTTODEVICE_CLASS_INTERFACE == requestType)
		{
			if (HID_SET_PROTOCOL == r)
			{
				_hid_protocol = setup.wValueL;
				return true;
			}

			if (HID_SET_IDLE == r)
			{
				_hid_idle = setup.wValueL;
				return true;
			}
		}
		return false;
	}
}

HID_::HID_(void)
{
	setup = &HID_Setup;
	getInterface = &HID_GetInterface;
	getDescriptor = &HID_GetDescriptor;
	numEndpoints = 1;
	numInterfaces = 1;
	endpointType = epType;

	HID_ENDPOINT_INT = PluggableUSB.addFunction(this, &HID_INTERFACE);
}

int HID_::begin(void)
{
	return 0;
}

#endif /* if defined(USBCON) */