static void db9_timer()

in joystick/db9.c [355:505]

• 111 lines of code
• 45 McCabe index (conditional complexity)

static void db9_timer(struct timer_list *t)
{
	struct db9 *db9 = from_timer(db9, t, timer);
	struct parport *port = db9->pd->port;
	struct input_dev *dev = db9->dev[0];
	struct input_dev *dev2 = db9->dev[1];
	int data, i;

	switch (db9->mode) {
		case DB9_MULTI_0802_2:

			data = parport_read_data(port) >> 3;

			input_report_abs(dev2, ABS_X, (data & DB9_RIGHT ? 0 : 1) - (data & DB9_LEFT ? 0 : 1));
			input_report_abs(dev2, ABS_Y, (data & DB9_DOWN  ? 0 : 1) - (data & DB9_UP   ? 0 : 1));
			input_report_key(dev2, BTN_TRIGGER, ~data & DB9_FIRE1);
			fallthrough;

		case DB9_MULTI_0802:

			data = parport_read_status(port) >> 3;

			input_report_abs(dev, ABS_X, (data & DB9_RIGHT ? 0 : 1) - (data & DB9_LEFT ? 0 : 1));
			input_report_abs(dev, ABS_Y, (data & DB9_DOWN  ? 0 : 1) - (data & DB9_UP   ? 0 : 1));
			input_report_key(dev, BTN_TRIGGER, data & DB9_FIRE1);
			break;

		case DB9_MULTI_STICK:

			data = parport_read_data(port);

			input_report_abs(dev, ABS_X, (data & DB9_RIGHT ? 0 : 1) - (data & DB9_LEFT ? 0 : 1));
			input_report_abs(dev, ABS_Y, (data & DB9_DOWN  ? 0 : 1) - (data & DB9_UP   ? 0 : 1));
			input_report_key(dev, BTN_TRIGGER, ~data & DB9_FIRE1);
			break;

		case DB9_MULTI2_STICK:

			data = parport_read_data(port);

			input_report_abs(dev, ABS_X, (data & DB9_RIGHT ? 0 : 1) - (data & DB9_LEFT ? 0 : 1));
			input_report_abs(dev, ABS_Y, (data & DB9_DOWN  ? 0 : 1) - (data & DB9_UP   ? 0 : 1));
			input_report_key(dev, BTN_TRIGGER, ~data & DB9_FIRE1);
			input_report_key(dev, BTN_THUMB,   ~data & DB9_FIRE2);
			break;

		case DB9_GENESIS_PAD:

			parport_write_control(port, DB9_NOSELECT);
			data = parport_read_data(port);

			input_report_abs(dev, ABS_X, (data & DB9_RIGHT ? 0 : 1) - (data & DB9_LEFT ? 0 : 1));
			input_report_abs(dev, ABS_Y, (data & DB9_DOWN  ? 0 : 1) - (data & DB9_UP   ? 0 : 1));
			input_report_key(dev, BTN_B, ~data & DB9_FIRE1);
			input_report_key(dev, BTN_C, ~data & DB9_FIRE2);

			parport_write_control(port, DB9_NORMAL);
			data = parport_read_data(port);

			input_report_key(dev, BTN_A,     ~data & DB9_FIRE1);
			input_report_key(dev, BTN_START, ~data & DB9_FIRE2);
			break;

		case DB9_GENESIS5_PAD:

			parport_write_control(port, DB9_NOSELECT);
			data = parport_read_data(port);

			input_report_abs(dev, ABS_X, (data & DB9_RIGHT ? 0 : 1) - (data & DB9_LEFT ? 0 : 1));
			input_report_abs(dev, ABS_Y, (data & DB9_DOWN  ? 0 : 1) - (data & DB9_UP   ? 0 : 1));
			input_report_key(dev, BTN_B, ~data & DB9_FIRE1);
			input_report_key(dev, BTN_C, ~data & DB9_FIRE2);

			parport_write_control(port, DB9_NORMAL);
			data = parport_read_data(port);

			input_report_key(dev, BTN_A,     ~data & DB9_FIRE1);
			input_report_key(dev, BTN_X,     ~data & DB9_FIRE2);
			input_report_key(dev, BTN_Y,     ~data & DB9_LEFT);
			input_report_key(dev, BTN_START, ~data & DB9_RIGHT);
			break;

		case DB9_GENESIS6_PAD:

			parport_write_control(port, DB9_NOSELECT); /* 1 */
			udelay(DB9_GENESIS6_DELAY);
			data = parport_read_data(port);

			input_report_abs(dev, ABS_X, (data & DB9_RIGHT ? 0 : 1) - (data & DB9_LEFT ? 0 : 1));
			input_report_abs(dev, ABS_Y, (data & DB9_DOWN  ? 0 : 1) - (data & DB9_UP   ? 0 : 1));
			input_report_key(dev, BTN_B, ~data & DB9_FIRE1);
			input_report_key(dev, BTN_C, ~data & DB9_FIRE2);

			parport_write_control(port, DB9_NORMAL);
			udelay(DB9_GENESIS6_DELAY);
			data = parport_read_data(port);

			input_report_key(dev, BTN_A, ~data & DB9_FIRE1);
			input_report_key(dev, BTN_START, ~data & DB9_FIRE2);

			parport_write_control(port, DB9_NOSELECT); /* 2 */
			udelay(DB9_GENESIS6_DELAY);
			parport_write_control(port, DB9_NORMAL);
			udelay(DB9_GENESIS6_DELAY);
			parport_write_control(port, DB9_NOSELECT); /* 3 */
			udelay(DB9_GENESIS6_DELAY);
			data=parport_read_data(port);

			input_report_key(dev, BTN_X,    ~data & DB9_LEFT);
			input_report_key(dev, BTN_Y,    ~data & DB9_DOWN);
			input_report_key(dev, BTN_Z,    ~data & DB9_UP);
			input_report_key(dev, BTN_MODE, ~data & DB9_RIGHT);

			parport_write_control(port, DB9_NORMAL);
			udelay(DB9_GENESIS6_DELAY);
			parport_write_control(port, DB9_NOSELECT); /* 4 */
			udelay(DB9_GENESIS6_DELAY);
			parport_write_control(port, DB9_NORMAL);
			break;

		case DB9_SATURN_PAD:
		case DB9_SATURN_DPP:
		case DB9_SATURN_DPP_2:

			db9_saturn(db9->mode, port, db9->dev);
			break;

		case DB9_CD32_PAD:

			data = parport_read_data(port);

			input_report_abs(dev, ABS_X, (data & DB9_RIGHT ? 0 : 1) - (data & DB9_LEFT ? 0 : 1));
			input_report_abs(dev, ABS_Y, (data & DB9_DOWN  ? 0 : 1) - (data & DB9_UP   ? 0 : 1));

			parport_write_control(port, 0x0a);

			for (i = 0; i < 7; i++) {
				data = parport_read_data(port);
				parport_write_control(port, 0x02);
				parport_write_control(port, 0x0a);
				input_report_key(dev, db9_cd32_btn[i], ~data & DB9_FIRE2);
			}

			parport_write_control(port, 0x00);
			break;
		}

	input_sync(dev);

	mod_timer(&db9->timer, jiffies + DB9_REFRESH_TIME);
}