/*
* Copyright (c) 2008-2024 Jonathan Schleifer <js@nil.im>
*
* All rights reserved.
*
* This program is free software: you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License version 3.0 only,
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
* version 3.0 for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* version 3.0 along with this program. If not, see
* <https://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <errno.h>
#include <fcntl.h>
#include <unistd.h>
#import "HIDEvdevGameController.h"
#import "OFArray.h"
#import "OFDictionary.h"
#import "OFFileManager.h"
#import "OFLocale.h"
#import "OFNumber.h"
#import "HIDGameControllerAxis.h"
#import "HIDGameControllerButton.h"
#import "HIDGameControllerMapping.h"
#include <sys/ioctl.h>
#include <linux/input.h>
#import "OFInitializationFailedException.h"
#import "OFInvalidArgumentException.h"
#import "OFOpenItemFailedException.h"
#import "OFOutOfRangeException.h"
#import "OFReadFailedException.h"
@interface HIDEvdevGameControllerAxis: HIDGameControllerAxis
{
@public
int32_t _minValue, _maxValue;
}
@end
@interface HIDEvdevGameControllerMapping: HIDGameControllerMapping
- (instancetype)of_initWithButtons: (OFDictionary *)buttons
axes: (OFDictionary *)axes OF_METHOD_FAMILY(init);
@end
static const uint16_t buttonIDs[] = {
BTN_A, BTN_B, BTN_C, BTN_X, BTN_Y, BTN_Z, BTN_TL, BTN_TR, BTN_TL2,
BTN_TR2, BTN_SELECT, BTN_START, BTN_MODE, BTN_THUMBL, BTN_THUMBR,
BTN_DPAD_UP, BTN_DPAD_DOWN, BTN_DPAD_LEFT, BTN_DPAD_RIGHT,
BTN_TRIGGER_HAPPY1, BTN_TRIGGER_HAPPY2, BTN_TRIGGER_HAPPY3,
BTN_TRIGGER_HAPPY4, BTN_TRIGGER_HAPPY5, BTN_TRIGGER_HAPPY6,
BTN_TRIGGER_HAPPY7, BTN_TRIGGER_HAPPY8, BTN_TRIGGER_HAPPY9,
BTN_TRIGGER_HAPPY10, BTN_TRIGGER_HAPPY11, BTN_TRIGGER_HAPPY12,
BTN_TRIGGER_HAPPY13, BTN_TRIGGER_HAPPY14, BTN_TRIGGER_HAPPY15,
BTN_TRIGGER_HAPPY16, BTN_TRIGGER_HAPPY17, BTN_TRIGGER_HAPPY18,
BTN_TRIGGER_HAPPY19, BTN_TRIGGER_HAPPY20, BTN_TRIGGER_HAPPY21,
BTN_TRIGGER_HAPPY22, BTN_TRIGGER_HAPPY23, BTN_TRIGGER_HAPPY24,
BTN_TRIGGER_HAPPY25, BTN_TRIGGER_HAPPY26, BTN_TRIGGER_HAPPY27,
BTN_TRIGGER_HAPPY28, BTN_TRIGGER_HAPPY29, BTN_TRIGGER_HAPPY30,
BTN_TRIGGER_HAPPY31, BTN_TRIGGER_HAPPY32, BTN_TRIGGER_HAPPY33,
BTN_TRIGGER_HAPPY34, BTN_TRIGGER_HAPPY35, BTN_TRIGGER_HAPPY36,
BTN_TRIGGER_HAPPY37, BTN_TRIGGER_HAPPY38, BTN_TRIGGER_HAPPY39,
BTN_TRIGGER_HAPPY40
};
static const uint16_t axisIDs[] = {
ABS_X, ABS_Y, ABS_Z, ABS_RX, ABS_RY, ABS_RZ, ABS_THROTTLE, ABS_RUDDER,
ABS_WHEEL, ABS_GAS, ABS_BRAKE, ABS_HAT0X, ABS_HAT0Y, ABS_HAT1X,
ABS_HAT1Y, ABS_HAT2X, ABS_HAT2Y, ABS_HAT3X, ABS_HAT3Y
};
static OFString *
buttonToName(uint16_t button)
{
switch (button) {
case BTN_A:
return @"A";
case BTN_B:
return @"B";
case BTN_C:
return @"C";
case BTN_X:
return @"X";
case BTN_Y:
return @"Y";
case BTN_Z:
return @"Z";
case BTN_TL:
return @"TL";
case BTN_TR:
return @"TR";
case BTN_TL2:
return @"TL2";
case BTN_TR2:
return @"TR2";
case BTN_SELECT:
return @"Select";
case BTN_START:
return @"Start";
case BTN_MODE:
return @"Mode";
case BTN_THUMBL:
return @"Thumb L";
case BTN_THUMBR:
return @"Thumb R";
case BTN_DPAD_UP:
return @"DPad Up";
case BTN_DPAD_DOWN:
return @"DPad Down";
case BTN_DPAD_LEFT:
return @"DPad Left";
case BTN_DPAD_RIGHT:
return @"DPad Right";
case BTN_TRIGGER_HAPPY1:
return @"Trigger Happy 1";
case BTN_TRIGGER_HAPPY2:
return @"Trigger Happy 2";
case BTN_TRIGGER_HAPPY3:
return @"Trigger Happy 3";
case BTN_TRIGGER_HAPPY4:
return @"Trigger Happy 4";
case BTN_TRIGGER_HAPPY5:
return @"Trigger Happy 5";
case BTN_TRIGGER_HAPPY6:
return @"Trigger Happy 6";
case BTN_TRIGGER_HAPPY7:
return @"Trigger Happy 7";
case BTN_TRIGGER_HAPPY8:
return @"Trigger Happy 8";
case BTN_TRIGGER_HAPPY9:
return @"Trigger Happy 9";
case BTN_TRIGGER_HAPPY10:
return @"Trigger Happy 10";
case BTN_TRIGGER_HAPPY11:
return @"Trigger Happy 11";
case BTN_TRIGGER_HAPPY12:
return @"Trigger Happy 12";
case BTN_TRIGGER_HAPPY13:
return @"Trigger Happy 13";
case BTN_TRIGGER_HAPPY14:
return @"Trigger Happy 14";
case BTN_TRIGGER_HAPPY15:
return @"Trigger Happy 15";
case BTN_TRIGGER_HAPPY16:
return @"Trigger Happy 16";
case BTN_TRIGGER_HAPPY17:
return @"Trigger Happy 17";
case BTN_TRIGGER_HAPPY18:
return @"Trigger Happy 18";
case BTN_TRIGGER_HAPPY19:
return @"Trigger Happy 19";
case BTN_TRIGGER_HAPPY20:
return @"Trigger Happy 20";
case BTN_TRIGGER_HAPPY21:
return @"Trigger Happy 21";
case BTN_TRIGGER_HAPPY22:
return @"Trigger Happy 22";
case BTN_TRIGGER_HAPPY23:
return @"Trigger Happy 23";
case BTN_TRIGGER_HAPPY24:
return @"Trigger Happy 24";
case BTN_TRIGGER_HAPPY25:
return @"Trigger Happy 25";
case BTN_TRIGGER_HAPPY26:
return @"Trigger Happy 26";
case BTN_TRIGGER_HAPPY27:
return @"Trigger Happy 27";
case BTN_TRIGGER_HAPPY28:
return @"Trigger Happy 28";
case BTN_TRIGGER_HAPPY29:
return @"Trigger Happy 29";
case BTN_TRIGGER_HAPPY30:
return @"Trigger Happy 30";
case BTN_TRIGGER_HAPPY31:
return @"Trigger Happy 31";
case BTN_TRIGGER_HAPPY32:
return @"Trigger Happy 32";
case BTN_TRIGGER_HAPPY33:
return @"Trigger Happy 33";
case BTN_TRIGGER_HAPPY34:
return @"Trigger Happy 34";
case BTN_TRIGGER_HAPPY35:
return @"Trigger Happy 35";
case BTN_TRIGGER_HAPPY36:
return @"Trigger Happy 36";
case BTN_TRIGGER_HAPPY37:
return @"Trigger Happy 37";
case BTN_TRIGGER_HAPPY38:
return @"Trigger Happy 38";
case BTN_TRIGGER_HAPPY39:
return @"Trigger Happy 39";
case BTN_TRIGGER_HAPPY40:
return @"Trigger Happy 40";
default:
return nil;
}
}
static OFString *
axisToName(uint16_t axis)
{
switch (axis) {
case ABS_X:
return @"X";
case ABS_Y:
return @"Y";
case ABS_Z:
return @"Z";
case ABS_RX:
return @"RX";
case ABS_RY:
return @"RY";
case ABS_RZ:
return @"RZ";
case ABS_THROTTLE:
return @"Throttle";
case ABS_RUDDER:
return @"Rudder";
case ABS_WHEEL:
return @"Wheel";
case ABS_GAS:
return @"Gas";
case ABS_BRAKE:
return @"Brake";
case ABS_HAT0X:
return @"HAT0X";
case ABS_HAT0Y:
return @"HAT0Y";
case ABS_HAT1X:
return @"HAT1X";
case ABS_HAT1Y:
return @"HAT1Y";
case ABS_HAT2X:
return @"HAT2X";
case ABS_HAT2Y:
return @"HAT2Y";
case ABS_HAT3X:
return @"HAT3X";
case ABS_HAT3Y:
return @"HAT3Y";
default:
return nil;
}
}
static float
scale(float value, float min, float max)
{
if (value < min)
value = min;
if (value > max)
value = max;
return ((value - min) / (max - min) * 2) - 1;
}
@implementation HIDEvdevGameController
@synthesize name = _name, unmappedMapping = _mapping;
+ (OFArray OF_GENERIC(HIDGameController *) *)controllers
{
OFMutableArray *controllers = [OFMutableArray array];
void *pool = objc_autoreleasePoolPush();
for (OFString *device in [[OFFileManager defaultManager]
contentsOfDirectoryAtPath: @"/dev/input"]) {
OFString *path;
HIDGameController *controller;
if (![device hasPrefix: @"event"])
continue;
path = [@"/dev/input" stringByAppendingPathComponent: device];
@try {
controller = [[[HIDEvdevGameController alloc]
of_initWithPath: path] autorelease];
} @catch (OFOpenItemFailedException *e) {
if (e.errNo == EACCES)
continue;
@throw e;
} @catch (OFInvalidArgumentException *e) {
/* Not a game controller. */
continue;
}
[controllers addObject: controller];
}
[controllers sort];
[controllers makeImmutable];
objc_autoreleasePoolPop(pool);
return controllers;
}
- (instancetype)of_initWithPath: (OFString *)path
{
self = [super init];
@try {
void *pool = objc_autoreleasePoolPush();
OFStringEncoding encoding = [OFLocale encoding];
struct input_id inputID;
char name[128];
OFMutableDictionary *buttons, *axes;
_path = [path copy];
if ((_fd = open([_path cStringWithEncoding: encoding],
O_RDONLY | O_NONBLOCK)) == -1)
@throw [OFOpenItemFailedException
exceptionWithPath: _path
mode: @"r"
errNo: errno];
_evBits = OFAllocZeroedMemory(OFRoundUpToPowerOf2(OF_ULONG_BIT,
EV_MAX) / OF_ULONG_BIT, sizeof(unsigned long));
if (ioctl(_fd, EVIOCGBIT(0, OFRoundUpToPowerOf2(
OF_ULONG_BIT, EV_MAX) / OF_ULONG_BIT *
sizeof(unsigned long)), _evBits) == -1)
@throw [OFInitializationFailedException exception];
if (!OFBitSetIsSet(_evBits, EV_KEY))
@throw [OFInvalidArgumentException exception];
_keyBits = OFAllocZeroedMemory(OFRoundUpToPowerOf2(OF_ULONG_BIT,
KEY_MAX) / OF_ULONG_BIT, sizeof(unsigned long));
if (ioctl(_fd, EVIOCGBIT(EV_KEY, OFRoundUpToPowerOf2(
OF_ULONG_BIT, KEY_MAX) / OF_ULONG_BIT *
sizeof(unsigned long)), _keyBits) == -1)
@throw [OFInitializationFailedException exception];
if (!OFBitSetIsSet(_keyBits, BTN_GAMEPAD) &&
!OFBitSetIsSet(_keyBits, BTN_DPAD_UP))
@throw [OFInvalidArgumentException exception];
if (ioctl(_fd, EVIOCGID, &inputID) == -1)
@throw [OFInvalidArgumentException exception];
_vendorID = inputID.vendor;
_productID = inputID.product;
if (ioctl(_fd, EVIOCGNAME(sizeof(name)), name) == -1)
@throw [OFInitializationFailedException exception];
_name = [[OFString alloc] initWithCString: name
encoding: encoding];
buttons = [OFMutableDictionary dictionary];
for (size_t i = 0; i < sizeof(buttonIDs) / sizeof(*buttonIDs);
i++) {
if (OFBitSetIsSet(_keyBits, buttonIDs[i])) {
OFString *buttonName;
HIDGameControllerButton *button;
buttonName = buttonToName(buttonIDs[i]);
if (buttonName == nil)
continue;
button = [[[HIDGameControllerButton alloc]
initWithName: buttonName] autorelease];
[buttons setObject: button forKey: buttonName];
}
}
[buttons makeImmutable];
axes = [OFMutableDictionary dictionary];
if (OFBitSetIsSet(_evBits, EV_ABS)) {
_absBits = OFAllocZeroedMemory(OFRoundUpToPowerOf2(
OF_ULONG_BIT, ABS_MAX) / OF_ULONG_BIT,
sizeof(unsigned long));
if (ioctl(_fd, EVIOCGBIT(EV_ABS, OFRoundUpToPowerOf2(
OF_ULONG_BIT, ABS_MAX) / OF_ULONG_BIT *
sizeof(unsigned long)), _absBits) == -1)
@throw [OFInitializationFailedException
exception];
for (size_t i = 0;
i < sizeof(axisIDs) / sizeof(*axisIDs); i++) {
if (OFBitSetIsSet(_absBits, axisIDs[i])) {
OFString *axisName;
HIDEvdevGameControllerAxis *axis;
axisName = axisToName(axisIDs[i]);
if (axisName == nil)
continue;
axis = [[[HIDEvdevGameControllerAxis
alloc] initWithName: axisName]
autorelease];
[axes setObject: axis forKey: axisName];
}
}
}
[axes makeImmutable];
_mapping = [[HIDEvdevGameControllerMapping alloc]
of_initWithButtons: buttons
axes: axes];
[self of_pollState];
objc_autoreleasePoolPop(pool);
} @catch (id e) {
[self release];
@throw e;
}
return self;
}
- (void)dealloc
{
[_path release];
if (_fd != -1)
close(_fd);
OFFreeMemory(_evBits);
OFFreeMemory(_keyBits);
OFFreeMemory(_absBits);
[_name release];
[_mapping release];
[super dealloc];
}
- (OFNumber *)vendorID
{
return [OFNumber numberWithUnsignedShort: _vendorID];
}
- (OFNumber *)productID
{
return [OFNumber numberWithUnsignedShort: _productID];
}
- (void)of_pollState
{
unsigned long keyState[OFRoundUpToPowerOf2(OF_ULONG_BIT, KEY_MAX) /
OF_ULONG_BIT] = { 0 };
if (ioctl(_fd, EVIOCGKEY(sizeof(keyState)), &keyState) == -1)
@throw [OFReadFailedException
exceptionWithObject: self
requestedLength: sizeof(keyState)
errNo: errno];
for (size_t i = 0; i < sizeof(buttonIDs) / sizeof(*buttonIDs);
i++) {
OFString *name;
HIDGameControllerButton *button;
if (!OFBitSetIsSet(_keyBits, buttonIDs[i]))
continue;
name = buttonToName(buttonIDs[i]);
if (name == nil)
continue;
button = [_mapping.buttons objectForKey: name];
if (button == nil)
continue;
if (OFBitSetIsSet(keyState, buttonIDs[i]))
button.value = 1.f;
else
button.value = 0.f;
}
if (OFBitSetIsSet(_evBits, EV_ABS)) {
for (size_t i = 0; i < sizeof(axisIDs) / sizeof(*axisIDs);
i++) {
struct input_absinfo info;
OFString *name;
HIDEvdevGameControllerAxis *axis;
if (!OFBitSetIsSet(_absBits, axisIDs[i]))
continue;
name = axisToName(axisIDs[i]);
if (name == nil)
continue;
axis = (HIDEvdevGameControllerAxis *)
[_mapping.axes objectForKey: name];
if (axis == nil)
continue;
if (ioctl(_fd, EVIOCGABS(axisIDs[i]), &info) == -1)
@throw [OFReadFailedException
exceptionWithObject: self
requestedLength: sizeof(info)
errNo: errno];
axis->_minValue = info.minimum;
axis->_maxValue = info.maximum;
axis.value = scale(info.value,
info.minimum, info.maximum);
}
}
}
- (void)retrieveState
{
void *pool = objc_autoreleasePoolPush();
struct input_event event;
for (;;) {
OFString *name;
HIDGameControllerButton *button;
HIDEvdevGameControllerAxis *axis;
errno = 0;
if (read(_fd, &event, sizeof(event)) < (int)sizeof(event)) {
if (errno == EWOULDBLOCK)
return;
@throw [OFReadFailedException
exceptionWithObject: self
requestedLength: sizeof(event)
errNo: errno];
}
if (_discardUntilReport) {
if (event.type == EV_SYN && event.value == SYN_REPORT) {
_discardUntilReport = false;
[self of_pollState];
}
continue;
}
switch (event.type) {
case EV_SYN:
if (event.value == SYN_DROPPED) {
_discardUntilReport = true;
continue;
}
break;
case EV_KEY:
name = buttonToName(event.code);
if (name == nil)
continue;
button = [_mapping.buttons objectForKey: name];
if (button == nil)
continue;
if (event.value)
button.value = 1.f;
else
button.value = 0.f;
break;
case EV_ABS:
name = axisToName(event.code);
if (name == nil)
continue;
axis = (HIDEvdevGameControllerAxis *)
[_mapping.axes objectForKey: name];
if (axis == nil)
continue;
axis.value = scale(event.value,
axis->_minValue, axis->_maxValue);
break;
}
}
objc_autoreleasePoolPop(pool);
}
- (OFComparisonResult)compare: (HIDEvdevGameController *)otherController
{
unsigned long long selfIndex, otherIndex;
if (![otherController isKindOfClass: [HIDEvdevGameController class]])
@throw [OFInvalidArgumentException exception];
selfIndex = [_path substringFromIndex: 16].unsignedLongLongValue;
otherIndex = [otherController->_path substringFromIndex: 16]
.unsignedLongLongValue;
if (selfIndex > otherIndex)
return OFOrderedDescending;
if (selfIndex < otherIndex)
return OFOrderedAscending;
return OFOrderedSame;
}
@end
@implementation HIDEvdevGameControllerAxis
@end
@implementation HIDEvdevGameControllerMapping
- (instancetype)of_initWithButtons: (OFDictionary *)buttons
axes: (OFDictionary *)axes
{
self = [super init];
@try {
_buttons = [buttons retain];
_axes = [axes retain];
} @catch (id e) {
[self release];
@throw e;
}
return self;
}
@end