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#ifndef RUBY_INPUT_JOYPAD_UDEV
#define RUBY_INPUT_JOYPAD_UDEV
struct InputJoypadUdev {
Input& input;
InputJoypadUdev(Input& input) : input(input) {}
udev* context = nullptr;
udev_monitor* monitor = nullptr;
udev_enumerate* enumerator = nullptr;
udev_list_entry* devices = nullptr;
udev_list_entry* item = nullptr;
struct JoypadInput {
signed code = 0;
unsigned id = 0;
int16_t value = 0;
input_absinfo info;
JoypadInput() {}
JoypadInput(signed code) : code(code) {}
JoypadInput(signed code, unsigned id) : code(code), id(id) {}
bool operator< (const JoypadInput& source) const { return code < source.code; }
bool operator==(const JoypadInput& source) const { return code == source.code; }
};
struct Joypad {
shared_pointer<HID::Joypad> hid{new HID::Joypad};
int fd = -1;
dev_t device = 0;
string deviceName;
string deviceNode;
uint8_t evbit[(EV_MAX + 7) / 8] = {0};
uint8_t keybit[(KEY_MAX + 7) / 8] = {0};
uint8_t absbit[(ABS_MAX + 7) / 8] = {0};
uint8_t ffbit[(FF_MAX + 7) / 8] = {0};
unsigned effects = 0;
string name;
string manufacturer;
string product;
string serial;
string vendorID;
string productID;
set<JoypadInput> axes;
set<JoypadInput> hats;
set<JoypadInput> buttons;
bool rumble = false;
unsigned effectID = 0;
};
vector<Joypad> joypads;
auto assign(shared_pointer<HID::Joypad> hid, unsigned groupID, unsigned inputID, int16_t value) -> void {
auto& group = hid->group(groupID);
if(group.input(inputID).value() == value) return;
input.doChange(hid, groupID, inputID, group.input(inputID).value(), value);
group.input(inputID).setValue(value);
}
auto poll(vector<shared_pointer<HID::Device>>& devices) -> void {
while(hotplugDevicesAvailable()) hotplugDevice();
for(auto& jp : joypads) {
input_event events[32];
signed length = 0;
while((length = read(jp.fd, events, sizeof(events))) > 0) {
length /= sizeof(input_event);
for(unsigned i = 0; i < length; i++) {
signed code = events[i].code;
signed type = events[i].type;
signed value = events[i].value;
if(type == EV_ABS) {
if(auto input = jp.axes.find({code})) {
signed range = input().info.maximum - input().info.minimum;
value = (value - input().info.minimum) * 65535ll / range - 32767;
assign(jp.hid, HID::Joypad::GroupID::Axis, input().id, sclamp<16>(value));
} else if(auto input = jp.hats.find({code})) {
signed range = input().info.maximum - input().info.minimum;
value = (value - input().info.minimum) * 65535ll / range - 32767;
assign(jp.hid, HID::Joypad::GroupID::Hat, input().id, sclamp<16>(value));
}
} else if(type == EV_KEY) {
if(code >= BTN_MISC) {
if(auto input = jp.buttons.find({code})) {
assign(jp.hid, HID::Joypad::GroupID::Button, input().id, (bool)value);
}
}
}
}
}
devices.append(jp.hid);
}
}
auto rumble(uint64_t id, bool enable) -> bool {
for(auto& jp : joypads) {
if(jp.hid->id() != id) continue;
if(!jp.hid->rumble()) continue;
input_event play;
memset(&play, 0, sizeof(input_event));
play.type = EV_FF;
play.code = jp.effectID;
play.value = enable;
auto unused = write(jp.fd, &play, sizeof(input_event));
return true;
}
return false;
}
auto init() -> bool {
context = udev_new();
if(context == nullptr) return false;
monitor = udev_monitor_new_from_netlink(context, "udev");
if(monitor) {
udev_monitor_filter_add_match_subsystem_devtype(monitor, "input", nullptr);
udev_monitor_enable_receiving(monitor);
}
enumerator = udev_enumerate_new(context);
if(enumerator) {
udev_enumerate_add_match_property(enumerator, "ID_INPUT_JOYSTICK", "1");
udev_enumerate_scan_devices(enumerator);
devices = udev_enumerate_get_list_entry(enumerator);
for(udev_list_entry* item = devices; item != nullptr; item = udev_list_entry_get_next(item)) {
string name = udev_list_entry_get_name(item);
udev_device* device = udev_device_new_from_syspath(context, name);
string deviceNode = udev_device_get_devnode(device);
if(deviceNode) createJoypad(device, deviceNode);
udev_device_unref(device);
}
}
return true;
}
auto term() -> void {
if(enumerator) { udev_enumerate_unref(enumerator); enumerator = nullptr; }
}
private:
auto hotplugDevicesAvailable() -> bool {
pollfd fd = {0};
fd.fd = udev_monitor_get_fd(monitor);
fd.events = POLLIN;
return (::poll(&fd, 1, 0) == 1) && (fd.revents & POLLIN);
}
auto hotplugDevice() -> void {
udev_device* device = udev_monitor_receive_device(monitor);
if(device == nullptr) return;
string value = udev_device_get_property_value(device, "ID_INPUT_JOYSTICK");
string action = udev_device_get_action(device);
string deviceNode = udev_device_get_devnode(device);
if(value == "1") {
if(action == "add") {
createJoypad(device, deviceNode);
}
if(action == "remove") {
removeJoypad(device, deviceNode);
}
}
}
auto createJoypad(udev_device* device, const string& deviceNode) -> void {
Joypad jp;
jp.deviceNode = deviceNode;
struct stat st;
if(stat(deviceNode, &st) < 0) return;
jp.device = st.st_rdev;
jp.fd = open(deviceNode, O_RDWR | O_NONBLOCK);
if(jp.fd < 0) return;
uint8_t evbit[(EV_MAX + 7) / 8] = {0};
uint8_t keybit[(KEY_MAX + 7) / 8] = {0};
uint8_t absbit[(ABS_MAX + 7) / 8] = {0};
ioctl(jp.fd, EVIOCGBIT(0, sizeof(jp.evbit)), jp.evbit);
ioctl(jp.fd, EVIOCGBIT(EV_KEY, sizeof(jp.keybit)), jp.keybit);
ioctl(jp.fd, EVIOCGBIT(EV_ABS, sizeof(jp.absbit)), jp.absbit);
ioctl(jp.fd, EVIOCGBIT(EV_FF, sizeof(jp.ffbit)), jp.ffbit);
ioctl(jp.fd, EVIOCGEFFECTS, &jp.effects);
#define testBit(buffer, bit) (buffer[(bit) >> 3] & 1 << ((bit) & 7))
if(testBit(jp.evbit, EV_KEY)) {
if(udev_device* parent = udev_device_get_parent_with_subsystem_devtype(device, "input", nullptr)) {
jp.name = udev_device_get_sysattr_value(parent, "name");
jp.vendorID = udev_device_get_sysattr_value(parent, "id/vendor");
jp.productID = udev_device_get_sysattr_value(parent, "id/product");
if(udev_device* root = udev_device_get_parent_with_subsystem_devtype(parent, "usb", "usb_device")) {
if(jp.vendorID == udev_device_get_sysattr_value(root, "idVendor")
&& jp.productID == udev_device_get_sysattr_value(root, "idProduct")
) {
jp.deviceName = udev_device_get_devpath(root);
jp.manufacturer = udev_device_get_sysattr_value(root, "manufacturer");
jp.product = udev_device_get_sysattr_value(root, "product");
jp.serial = udev_device_get_sysattr_value(root, "serial");
}
}
}
unsigned axes = 0;
unsigned hats = 0;
unsigned buttons = 0;
for(signed i = 0; i < ABS_MISC; i++) {
if(testBit(jp.absbit, i)) {
if(i >= ABS_HAT0X && i <= ABS_HAT3Y) {
if(auto hat = jp.hats.insert({i, hats++})) {
ioctl(jp.fd, EVIOCGABS(i), &hat().info);
}
} else {
if(auto axis = jp.axes.insert({i, axes++})) {
ioctl(jp.fd, EVIOCGABS(i), &axis().info);
}
}
}
}
for(signed i = BTN_JOYSTICK; i < KEY_MAX; i++) {
if(testBit(jp.keybit, i)) {
jp.buttons.insert({i, buttons++});
}
}
for(signed i = BTN_MISC; i < BTN_JOYSTICK; i++) {
if(testBit(jp.keybit, i)) {
jp.buttons.insert({i, buttons++});
}
}
jp.rumble = jp.effects >= 2 && testBit(jp.ffbit, FF_RUMBLE);
if(jp.rumble) {
ff_effect effect;
memset(&effect, 0, sizeof(ff_effect));
effect.type = FF_RUMBLE;
effect.id = -1;
effect.u.rumble.strong_magnitude = 65535;
effect.u.rumble.weak_magnitude = 65535;
ioctl(jp.fd, EVIOCSFF, &effect);
jp.effectID = effect.id;
}
createJoypadHID(jp);
joypads.append(jp);
}
#undef testBit
}
auto createJoypadHID(Joypad& jp) -> void {
uint64_t pathID = Hash::CRC32(jp.deviceName.data(), jp.deviceName.size()).value();
jp.hid->setID(pathID << 32 | hex(jp.vendorID) << 16 | hex(jp.productID) << 0);
for(unsigned n = 0; n < jp.axes.size(); n++) jp.hid->axes().append(n);
for(unsigned n = 0; n < jp.hats.size(); n++) jp.hid->hats().append(n);
for(unsigned n = 0; n < jp.buttons.size(); n++) jp.hid->buttons().append(n);
jp.hid->setRumble(jp.rumble);
}
auto removeJoypad(udev_device* device, const string& deviceNode) -> void {
for(unsigned n = 0; n < joypads.size(); n++) {
if(joypads[n].deviceNode == deviceNode) {
close(joypads[n].fd);
joypads.remove(n);
return;
}
}
}
};
#endif
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