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/* Copyright (c) 2017, Eike Ziller *
* *
* 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. *
*/
#include "foohidjoystick.h"
#include "compat/macros.hpp"
const char FOOHID_SERVICE_NAME[] = "it_unbit_foohid";
enum class FooHIDMethod {
Create = 0,
Destroy,
Send,
List,
Subscribe
};
// Joystick USB descriptor
static unsigned char report_descriptor[] = {
0x05, 0x01, // USAGE_PAGE (Generic Desktop)
0x09, 0x04, // USAGE (Joystick)
0xa1, 0x01, // COLLECTION (Application)
0x09, 0x01, // USAGE (Pointer)
0xa1, 0x00, // COLLECTION (Physical)
0x05, 0x01, // USAGE_PAGE (Generic Desktop)
0x09, 0x30, // USAGE (X)
0x09, 0x31, // USAGE (Y)
0x09, 0x32, // USAGE (Z)
0x09, 0x33, // USAGE (RX)
0x09, 0x34, // USAGE (RY)
0x09, 0x35, // USAGE (RZ)
0x15, 0x00, // LOGICAL_MINIMUM (0)
0x26, 0xff, 0x00, // LOGICAL_MAXIMUM (255)
0x75, 0x08, // REPORT_SIZE (8)
0x95, 0x06, // REPORT_COUNT (6)
0x81, 0x02, // INPUT (Data,Var,Abs)
0xc0, // END_COLLECTION
0xc0 // END_COLLECTION
};
static bool connectToService(io_connect_t *connection, QString *errorMessage)
{
io_iterator_t iterator;
io_service_t service;
// Get an iterator over all IOService instances
kern_return_t ret = IOServiceGetMatchingServices(kIOMasterPortDefault,
IOServiceMatching(FOOHID_SERVICE_NAME),
&iterator);
if (ret != KERN_SUCCESS) {
*errorMessage = QObject::tr("Unable to find FooHID IOService.");
return false;
}
// Iterate over services and try to open connection
bool found = false;
while ((service = IOIteratorNext(iterator)) != IO_OBJECT_NULL) {
ret = IOServiceOpen(service, mach_task_self(), 0, connection);
if (ret == KERN_SUCCESS) {
found = true;
break;
}
IOObjectRelease(service);
}
IOObjectRelease(iterator);
if (!found) {
*errorMessage = QObject::tr("Unable to connect to FooHID IOService.");
return false;
}
return true;
}
static void disconnectFromService(io_connect_t connection)
{
IOServiceClose(connection);
// ignore errors
}
FooHIDJoystick::FooHIDJoystick(const QByteArray &name, const QByteArray &serialNumber)
: name(name), serialNumber(serialNumber)
{
connectionOpened = connectToService(&connection, &_errorMessage);
_hasError = !connectionOpened;
if (!_hasError) {
// first try to destroy device, in case it was left-over (from a crash/interrupt)
destroyDevice();
deviceCreated = createDevice();
_hasError = !deviceCreated;
if (!deviceCreated)
_errorMessage = tr("Failed to create virtual joystick");
}
}
FooHIDJoystick::~FooHIDJoystick()
{
if (deviceCreated)
destroyDevice();
if (connectionOpened)
disconnectFromService(connection);
}
bool FooHIDJoystick::hasError() const
{
return _hasError;
}
QString FooHIDJoystick::errorMessage() const
{
return _errorMessage;
}
void FooHIDJoystick::setValue(JoystickValues newValues)
{
values = newValues;
if (!sendToDevice()) {
_hasError = true;
_errorMessage = tr("Failed to send values to virtual joystick");
}
}
bool FooHIDJoystick::createDevice() const
{
uint64_t params[8];
params[0] = uint64_t(name.constData()); // pointer to name
params[1] = uint64_t(name.size()); // size of name without \0
params[2] = uint64_t(report_descriptor); // pointer to report descriptor
params[3] = sizeof(report_descriptor); // size of report descriptor
params[4] = uint64_t(serialNumber.constData()); // pointer to serial number
params[5] = uint64_t(serialNumber.size()); // size of serial number without \0
params[6] = uint64_t(2); // vendor ID
params[7] = uint64_t(3); // device ID
kern_return_t ret = IOConnectCallScalarMethod(connection, int(FooHIDMethod::Create), params,
sizeof(params)/sizeof(params[0]), NULL, 0);
return ret == KERN_SUCCESS;
}
bool FooHIDJoystick::sendToDevice() const
{
uint64_t params[4];
params[0] = uint64_t(name.constData()); // pointer to name
params[1] = uint64_t(name.size()); // size of name without \0
params[2] = uint64_t(&values); // pointer to values
params[3] = sizeof(struct JoystickValues); // length of value struct
kern_return_t ret = IOConnectCallScalarMethod(connection, int(FooHIDMethod::Send), params,
sizeof(params)/sizeof(params[0]), NULL, 0);
return ret == KERN_SUCCESS;
}
void FooHIDJoystick::destroyDevice() const
{
uint64_t params[2];
params[0] = uint64_t(name.constData()); // pointer to name
params[1] = uint64_t(name.size()); // size of name without \0
IOConnectCallScalarMethod(connection, int(FooHIDMethod::Destroy), params,
sizeof(params)/sizeof(params[0]), NULL, 0);
// ignore failure
}
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