static int hidinput_apple_event()

in hid-apple.c [227:341]

• 98 lines of code
• 31 McCabe index (conditional complexity)

static int hidinput_apple_event(struct hid_device *hid, struct input_dev *input,
		struct hid_usage *usage, __s32 value)
{
	struct apple_sc *asc = hid_get_drvdata(hid);
	const struct apple_key_translation *trans, *table;
	bool do_translate;
	u16 code = 0;

	u16 fn_keycode = (swap_fn_leftctrl) ? (KEY_LEFTCTRL) : (KEY_FN);

	if (usage->code == fn_keycode) {
		asc->fn_on = !!value;
		input_event_with_scancode(input, usage->type, KEY_FN,
				usage->hid, value);
		return 1;
	}

	if (fnmode) {
		if (hid->product == USB_DEVICE_ID_APPLE_MAGIC_KEYBOARD_2021 ||
		    hid->product == USB_DEVICE_ID_APPLE_MAGIC_KEYBOARD_FINGERPRINT_2021 ||
		    hid->product == USB_DEVICE_ID_APPLE_MAGIC_KEYBOARD_NUMPAD_2021)
			table = apple2021_fn_keys;
		else if (hid->product >= USB_DEVICE_ID_APPLE_WELLSPRING4_ANSI &&
				hid->product <= USB_DEVICE_ID_APPLE_WELLSPRING4A_JIS)
			table = macbookair_fn_keys;
		else if (hid->product < 0x21d || hid->product >= 0x300)
			table = powerbook_fn_keys;
		else
			table = apple_fn_keys;

		trans = apple_find_translation (table, usage->code);

		if (trans) {
			if (test_bit(trans->from, input->key))
				code = trans->from;
			else if (test_bit(trans->to, input->key))
				code = trans->to;

			if (!code) {
				if (trans->flags & APPLE_FLAG_FKEY) {
					switch (fnmode) {
					case 1:
						do_translate = !asc->fn_on;
						break;
					case 2:
						do_translate = asc->fn_on;
						break;
					default:
						/* should never happen */
						do_translate = false;
					}
				} else {
					do_translate = asc->fn_on;
				}

				code = do_translate ? trans->to : trans->from;
			}

			input_event_with_scancode(input, usage->type, code,
					usage->hid, value);
			return 1;
		}

		if (asc->quirks & APPLE_NUMLOCK_EMULATION &&
				(test_bit(usage->code, asc->pressed_numlock) ||
				test_bit(LED_NUML, input->led))) {
			trans = apple_find_translation(powerbook_numlock_keys,
					usage->code);

			if (trans) {
				if (value)
					set_bit(usage->code,
							asc->pressed_numlock);
				else
					clear_bit(usage->code,
							asc->pressed_numlock);

				input_event_with_scancode(input, usage->type,
						trans->to, usage->hid, value);
			}

			return 1;
		}
	}

	if (iso_layout > 0 || (iso_layout < 0 && (asc->quirks & APPLE_ISO_TILDE_QUIRK) &&
			hid->country == HID_COUNTRY_INTERNATIONAL_ISO)) {
		trans = apple_find_translation(apple_iso_keyboard, usage->code);
		if (trans) {
			input_event_with_scancode(input, usage->type,
					trans->to, usage->hid, value);
			return 1;
		}
	}

	if (swap_opt_cmd) {
		trans = apple_find_translation(swapped_option_cmd_keys, usage->code);
		if (trans) {
			input_event_with_scancode(input, usage->type,
					trans->to, usage->hid, value);
			return 1;
		}
	}

	if (swap_fn_leftctrl) {
		trans = apple_find_translation(swapped_fn_leftctrl_keys, usage->code);
		if (trans) {
			input_event_with_scancode(input, usage->type,
					trans->to, usage->hid, value);
			return 1;
		}
	}

	return 0;
}