/*
* 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 "OHEvdevGameController.h"
#import "OFArray.h"
#import "OFDictionary.h"
#import "OFFileManager.h"
#import "OFLocale.h"
#import "OFNumber.h"
#import "OHDualSenseGamepad.h"
#import "OHDualShock4Gamepad.h"
#import "OHEvdevExtendedGamepad.h"
#import "OHGameControllerAxis+Private.h"
#import "OHGameControllerAxis.h"
#import "OHGameControllerButton.h"
#import "OHGameControllerProfile.h"
#import "OHStadiaGamepad.h"
#include <sys/ioctl.h>
#include <linux/input.h>
#import "OFInitializationFailedException.h"
#import "OFInvalidArgumentException.h"
#import "OFOpenItemFailedException.h"
#import "OFOutOfRangeException.h"
#import "OFReadFailedException.h"
const uint16_t OHEvdevButtonIDs[] = {
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
};
const size_t OHNumEvdevButtonIDs =
sizeof(OHEvdevButtonIDs) / sizeof(*OHEvdevButtonIDs);
const uint16_t OHEvdevAxisIDs[] = {
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
};
const size_t OHNumEvdevAxisIDs =
sizeof(OHEvdevAxisIDs) / sizeof(*OHEvdevAxisIDs);
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 OHEvdevGameController
@synthesize name = _name, profile = _profile;
+ (OFArray OF_GENERIC(OHGameController *) *)controllers
{
OFMutableArray *controllers = [OFMutableArray array];
void *pool = objc_autoreleasePoolPush();
for (OFString *device in [[OFFileManager defaultManager]
contentsOfDirectoryAtPath: @"/dev/input"]) {
OFString *path;
OHGameController *controller;
if (![device hasPrefix: @"event"])
continue;
path = [@"/dev/input" stringByAppendingPathComponent: device];
@try {
controller = [[[OHEvdevGameController alloc]
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)initWithPath: (OFString *)path
{
self = [super init];
@try {
void *pool = objc_autoreleasePoolPush();
OFStringEncoding encoding = [OFLocale encoding];
struct input_id inputID;
char name[128];
_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];
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];
}
if (_vendorID == OHVendorIDSony &&
_productID == OHProductIDDualSense)
_profile = [[OHDualSenseGamepad alloc] init];
else if (_vendorID == OHVendorIDSony &&
_productID == OHProductIDDualShock4)
_profile = [[OHDualShock4Gamepad alloc] init];
else if (_vendorID == OHVendorIDGoogle &&
_productID == OHProductIDStadiaController)
_profile = [[OHStadiaGamepad alloc] init];
else
_profile = [[OHEvdevExtendedGamepad alloc]
initWithKeyBits: _keyBits
evBits: _evBits
absBits: _absBits
vendorID: _vendorID
productID: _productID];
[self oh_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];
[_profile release];
[super dealloc];
}
- (OFNumber *)vendorID
{
return [OFNumber numberWithUnsignedShort: _vendorID];
}
- (OFNumber *)productID
{
return [OFNumber numberWithUnsignedShort: _productID];
}
- (void)oh_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 < OHNumEvdevButtonIDs; i++) {
OHGameControllerButton *button;
if (!OFBitSetIsSet(_keyBits, OHEvdevButtonIDs[i]))
continue;
button = [_profile
oh_buttonForEvdevButton: OHEvdevButtonIDs[i]];
if (button == nil)
continue;
if (OFBitSetIsSet(keyState, OHEvdevButtonIDs[i]))
button.value = 1.f;
else
button.value = 0.f;
}
if (OFBitSetIsSet(_evBits, EV_ABS)) {
for (size_t i = 0; i < OHNumEvdevAxisIDs; i++) {
struct input_absinfo info;
OHGameControllerAxis *axis;
if (!OFBitSetIsSet(_absBits, OHEvdevAxisIDs[i]))
continue;
axis = [_profile
oh_axisForEvdevAxis: OHEvdevAxisIDs[i]];
if (axis == nil)
continue;
if (ioctl(_fd, EVIOCGABS(OHEvdevAxisIDs[i]),
&info) == -1)
@throw [OFReadFailedException
exceptionWithObject: self
requestedLength: sizeof(info)
errNo: errno];
axis.oh_minRawValue = info.minimum;
axis.oh_maxRawValue = info.maximum;
axis.value = scale(info.value,
info.minimum, info.maximum);
}
}
}
- (void)retrieveState
{
void *pool = objc_autoreleasePoolPush();
struct input_event event;
for (;;) {
OHGameControllerButton *button;
OHGameControllerAxis *axis;
errno = 0;
if (read(_fd, &event, sizeof(event)) < (int)sizeof(event)) {
if (errno == EWOULDBLOCK) {
objc_autoreleasePoolPop(pool);
return;
}
@throw [OFReadFailedException
exceptionWithObject: self
requestedLength: sizeof(event)
errNo: errno];
}
if (_discardUntilReport) {
if (event.type == EV_SYN && event.value == SYN_REPORT) {
_discardUntilReport = false;
[self oh_pollState];
}
continue;
}
switch (event.type) {
case EV_SYN:
if (event.value == SYN_DROPPED) {
_discardUntilReport = true;
continue;
}
break;
case EV_KEY:
button = [_profile oh_buttonForEvdevButton: event.code];
if (button == nil)
continue;
if (event.value)
button.value = 1.f;
else
button.value = 0.f;
break;
case EV_ABS:
axis = [_profile oh_axisForEvdevAxis: event.code];
if (axis == nil)
continue;
axis.value = scale(event.value,
axis.oh_minRawValue, axis.oh_maxRawValue);
break;
}
}
}
- (id <OHGamepad>)gamepad
{
if ([_profile conformsToProtocol: @protocol(OHGamepad)])
return (id <OHGamepad>)_profile;
return nil;
}
- (id <OHExtendedGamepad>)extendedGamepad
{
if ([_profile conformsToProtocol: @protocol(OHExtendedGamepad)])
return (id <OHExtendedGamepad>)_profile;
return nil;
}
- (OFComparisonResult)compare: (OHEvdevGameController *)otherController
{
unsigned long long selfIndex, otherIndex;
if (![otherController isKindOfClass: [OHEvdevGameController 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