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