linux-imx

/*

 * Synaptics TouchPad PS/2 mouse driver

 *

 *   2003 Dmitry Torokhov <dtor@mail.ru>

 *     Added support for pass-through port. Special thanks to Peter Berg Larsen

 *     for explaining various Synaptics quirks.

 *

 *   2003 Peter Osterlund <petero2@telia.com>

 *     Ported to 2.5 input device infrastructure.

 *

 *   Copyright (C) 2001 Stefan Gmeiner <riddlebox@freesurf.ch>

 *     start merging tpconfig and gpm code to a xfree-input module

 *     adding some changes and extensions (ex. 3rd and 4th button)

 *

 *   Copyright (c) 1997 C. Scott Ananian <cananian@alumni.priceton.edu>

 *   Copyright (c) 1998-2000 Bruce Kalk <kall@compass.com>

 *     code for the special synaptics commands (from the tpconfig-source)

 *

 * This program is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 as published by

 * the Free Software Foundation.

 *

 * Trademarks are the property of their respective owners.

 */

​

#include <linux/module.h>

#include <linux/delay.h>

#include <linux/dmi.h>

#include <linux/input/mt.h>

#include <linux/serio.h>

#include <linux/libps2.h>

#include <linux/rmi.h>

#include <linux/i2c.h>

#include <linux/slab.h>

#include "psmouse.h"

#include "synaptics.h"

​

/*

 * The x/y limits are taken from the Synaptics TouchPad interfacing Guide,

 * section 2.3.2, which says that they should be valid regardless of the

 * actual size of the sensor.

 * Note that newer firmware allows querying device for maximum useable

 * coordinates.

 */

#define XMIN 0

#define XMAX 6143

#define YMIN 0

#define YMAX 6143

#define XMIN_NOMINAL 1472

#define XMAX_NOMINAL 5472

#define YMIN_NOMINAL 1408

#define YMAX_NOMINAL 4448

​

/* Size in bits of absolute position values reported by the hardware */

#define ABS_POS_BITS 13

​

/*

 * These values should represent the absolute maximum value that will

 * be reported for a positive position value. Some Synaptics firmware

 * uses this value to indicate a finger near the edge of the touchpad

 * whose precise position cannot be determined.

 *

 * At least one touchpad is known to report positions in excess of this

 * value which are actually negative values truncated to the 13-bit

 * reporting range. These values have never been observed to be lower

 * than 8184 (i.e. -8), so we treat all values greater than 8176 as

 * negative and any other value as positive.

 */

#define X_MAX_POSITIVE 8176

#define Y_MAX_POSITIVE 8176

​

/* maximum ABS_MT_POSITION displacement (in mm) */

#define DMAX 10

​

/*****************************************************************************

 *  Stuff we need even when we do not want native Synaptics support

 ****************************************************************************/

​

/*

 * Set the synaptics touchpad mode byte by special commands

 */

static int synaptics_mode_cmd(struct psmouse *psmouse, u8 mode)

{

    u8 param[1];

    int error;

​

    error = ps2_sliced_command(&psmouse->ps2dev, mode);

    if (error)

        return error;

​

    param[0] = SYN_PS_SET_MODE2;

    error = ps2_command(&psmouse->ps2dev, param, PSMOUSE_CMD_SETRATE);