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#pragma once
#include <usbhid.h>
#include <dev/usb/usbhid.h>
#include <dev/usb/usb_ioctl.h>
struct InputJoypadUHID {
Input& input;
InputJoypadUHID(Input& input) : input(input) {}
struct Joypad {
shared_pointer<HID::Joypad> hid{new HID::Joypad};
s32 fd = -1;
report_desc_t report;
s32 reportID = -1;
s32 reportSize = -1;
u8* buffer = nullptr;
bool writable = false;
};
vector<Joypad> joypads;
auto assign(Joypad& joypad, u32 groupID, u32 inputID, s16 value) -> void {
auto& group = joypad.hid->group(groupID);
if(group.input(inputID).value() == value) return;
input.doChange(joypad.hid, groupID, inputID, group.input(inputID).value(), value);
group.input(inputID).setValue(value);
}
auto poll(vector<shared_pointer<HID::Device>>& devices) -> void {
//hotplug support
u64 thisTimestamp = chrono::millisecond();
if(thisTimestamp - lastTimestamp >= 2000) {
lastTimestamp = thisTimestamp;
auto devices = directory::files("/dev/", "uhid*");
if(enumeratedDevices != devices.merge(";")) initialize();
}
for(auto& joypad : joypads) {
bool isXbox = joypad.hid->vendorID() == 0x045e && joypad.hid->productID() == 0x028e;
s16 hat[2] = {0, 0};
u32 axis = 0;
u32 button = 0;
while(read(joypad.fd, joypad.buffer, joypad.reportSize) == joypad.reportSize) {
auto parse = hid_start_parse(joypad.report, 1 << hid_input, joypad.reportID);
hid_item_t item;
while(hid_get_item(parse, &item) > 0) {
if(item.kind != hid_input) continue;
if(HID_PAGE(item.usage) == HUP_GENERIC_DESKTOP) {
auto usage = HID_USAGE(item.usage);
auto value = hid_get_data(joypad.buffer, &item);
if(value == -32768) value = -32767;
//Xbox 360 hat support
if(usage == 0x90 && value == 1) { hat[1] = -32767; continue; } //HatUp
if(usage == 0x91 && value == 1) { hat[1] = +32767; continue; } //HatDown
if(usage == 0x93 && value == 1) { hat[0] = -32767; continue; } //HatLeft
if(usage == 0x92 && value == 1) { hat[0] = +32767; continue; } //HatRight
if(isXbox) {
if(usage == HUG_X ) assign(joypad, HID::Joypad::GroupID::Axis, 0, +value); //LeftThumbX
if(usage == HUG_Y ) assign(joypad, HID::Joypad::GroupID::Axis, 1, -value); //LeftThumbY
if(usage == HUG_RX) assign(joypad, HID::Joypad::GroupID::Axis, 2, +value); //RightThumbX
if(usage == HUG_RY) assign(joypad, HID::Joypad::GroupID::Axis, 3, -value); //RightTHumbY
if(usage == HUG_Z ) assign(joypad, HID::Joypad::GroupID::Trigger, 0, value << 7 | value >> 1);
if(usage == HUG_RZ) assign(joypad, HID::Joypad::GroupID::Trigger, 1, value << 7 | value >> 1);
} else if(usage == HUG_X || usage == HUG_Y || usage == HUG_Z
|| usage == HUG_RX || usage == HUG_RY || usage == HUG_RZ
) {
if(axis < joypad.hid->axes().size()) {
assign(joypad, HID::Joypad::GroupID::Axis, axis++, value);
}
} else if(usage == HUG_HAT_SWITCH) {
//todo
}
}
if(HID_PAGE(item.usage) == HUP_BUTTON) {
auto value = hid_get_data(joypad.buffer, &item);
if(button < joypad.hid->buttons().size()) {
assign(joypad, HID::Joypad::GroupID::Button, button++, value);
}
}
}
if(isXbox) {
assign(joypad, HID::Joypad::GroupID::Hat, 0, hat[0]);
assign(joypad, HID::Joypad::GroupID::Hat, 1, hat[1]);
}
hid_end_parse(parse);
}
devices.append(joypad.hid);
}
}
auto initialize() -> bool {
terminate();
u32 pathID = 0;
auto devices = directory::files("/dev/", "uhid*");
enumeratedDevices = devices.merge(";");
for(auto device : devices) {
Joypad joypad;
string deviceName = {"/dev/", device};
if(inode::writable(deviceName)) {
//needed to use hid_set_report and write on fd
joypad.fd = open(deviceName, O_RDWR | O_NONBLOCK);
joypad.writable = true;
} else if(inode::readable(deviceName)) {
joypad.fd = open(deviceName, O_RDONLY | O_NONBLOCK);
joypad.writable = false;
} else {
continue;
}
//device files use global state: if two processes open the same device file, the driver can crash the process.
//this can easily happen by opening two instances of a program utilizing this driver, for instance.
//to prevent this, request an exclusive access lock on the file, released via terminate() or on error below.
if(flock(joypad.fd, LOCK_EX) != 0) { //0 = success; -1 = error
close(joypad.fd);
continue;
}
joypad.report = hid_get_report_desc(joypad.fd);
joypad.reportID = hid_get_report_id(joypad.fd);
joypad.reportSize = hid_report_size(joypad.report, hid_input, joypad.reportID);
joypad.buffer = new u8[joypad.reportSize];
auto parse = hid_start_parse(joypad.report, 1 << hid_input, joypad.reportID);
hid_item_t item;
bool isJoypad = false;
u32 axes = 0;
u32 hats = 0;
u32 buttons = 0;
bool xbox360[4] = {0, 0, 0, 0};
while(hid_get_item(parse, &item)) {
if(item.kind == hid_collection && HID_PAGE(item.usage) == HUP_GENERIC_DESKTOP) {
if(HID_USAGE(item.usage) == HUG_JOYSTICK) isJoypad = true;
if(HID_USAGE(item.usage) == HUG_GAME_PAD) isJoypad = true;
if(HID_USAGE(item.usage) == HUG_POINTER ) isJoypad = true; //PS3 sixaxis
}
if(item.kind == hid_input && HID_PAGE(item.usage) == HUP_GENERIC_DESKTOP) {
auto usage = HID_USAGE(item.usage);
if(usage == HUG_X || usage == HUG_Y || usage == HUG_Z ) axes++;
if(usage == HUG_RX || usage == HUG_RY || usage == HUG_RZ) axes++;
if(usage == HUG_HAT_SWITCH) hats++;
if(usage >= 0x90 && usage <= 0x93) xbox360[usage - 0x90] = 1;
}
if(item.kind == hid_input && HID_PAGE(item.usage) == HUP_BUTTON) {
buttons++;
}
}
hid_end_parse(parse);
if(!isJoypad) {
flock(joypad.fd, LOCK_UN);
close(joypad.fd);
continue;
}
if(xbox360[0] && xbox360[1] && xbox360[2] && xbox360[3]) {
joypad.hid->setVendorID(0x045e);
joypad.hid->setProductID(0x028e);
joypad.hid->setPathID(pathID++);
joypad.hid->axes().append("LeftThumbX");
joypad.hid->axes().append("LeftThumbY");
joypad.hid->axes().append("RightThumbX");
joypad.hid->axes().append("RightThumbY");
joypad.hid->hats().append("HatX");
joypad.hid->hats().append("HatY");
joypad.hid->triggers().append("LeftTrigger");
joypad.hid->triggers().append("RightTrigger");
joypad.hid->buttons().append("Start");
joypad.hid->buttons().append("Back");
joypad.hid->buttons().append("LeftThumb");
joypad.hid->buttons().append("RightThumb");
joypad.hid->buttons().append("LeftShoulder");
joypad.hid->buttons().append("RightShoulder");
joypad.hid->buttons().append("Guide");
joypad.hid->buttons().append("A");
joypad.hid->buttons().append("B");
joypad.hid->buttons().append("X");
joypad.hid->buttons().append("Y");
} else {
joypad.hid->setVendorID(HID::Joypad::GenericVendorID);
joypad.hid->setProductID(HID::Joypad::GenericProductID);
joypad.hid->setPathID(pathID++);
for(u32 n : range(axes)) joypad.hid->axes().append(n);
for(u32 n : range(axes)) joypad.hid->hats().append(n);
for(u32 n : range(axes)) joypad.hid->buttons().append(n);
}
joypads.append(joypad);
}
lastTimestamp = chrono::millisecond();
return true;
}
auto terminate() -> void {
for(auto& joypad : joypads) {
delete[] joypad.buffer;
flock(joypad.fd, LOCK_UN);
close(joypad.fd);
}
joypads.reset();
}
private:
u64 lastTimestamp = 0;
string enumeratedDevices;
};
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