input: joystick: Add support for ShinEtsu VTD518 Touchdisc

VTD518 Touchdisc is a device from ShinEtsu supporting communication
over I2C. It is a multifunction touchdisc which supports rotary
scrolling, X/Y absolute positioning, X/Y relative movement,
kinetic scrolling and 5-way switch input.

The device reports various motion and key-press events via
interrupts. Based on the interrupt status, the driver communicates
with the device over I2c and receives the events. These events
are then reported to the input subsystem.

CRs-Fixed: 237218
Change-Id: Ib40bf4a6e294eae4b0199101a1725c226139da71
Signed-off-by: Anirudh Ghayal <aghayal@qualcomm.com>

include/linux/input/tdisc_shinetsu.h

@@ -0,0 +1,42 @@
+/* Copyright (c) 2010, Code Aurora Forum. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#ifndef _TDISC_SHINETSU_H_
+#define _TDISC_SHINETSU_H_
+
+struct tdisc_abs_values {
+	int	x_max;
+	int	y_max;
+	int	x_min;
+	int	y_min;
+	int	pressure_max;
+	int	pressure_min;
+};
+
+struct tdisc_platform_data {
+	int	(*tdisc_setup) (void);
+	void	(*tdisc_release) (void);
+	int	(*tdisc_enable) (void);
+	int	(*tdisc_disable)(void);
+	int	tdisc_wakeup;
+	int	tdisc_gpio;
+	bool	tdisc_report_keys;
+	bool	tdisc_report_relative;
+	bool	tdisc_report_absolute;
+	bool	tdisc_report_wheel;
+	bool	tdisc_reverse_x;
+	bool	tdisc_reverse_y;
+	struct	tdisc_abs_values *tdisc_abs;
+};
+
+#endif /* _TDISC_SHINETSU_H_ */