Regards,
Mathias

 drivers/input/mouse/Kconfig        |  10 ++
 drivers/input/mouse/focaltech.c    | 326
++++++++++++++++++++++++++++++++++++-
 drivers/input/mouse/focaltech.h    |  61 +++++++
 drivers/input/mouse/psmouse-base.c |  15 ++
 drivers/input/mouse/psmouse.h      |   1 +
 5 files changed, 406 insertions(+), 7 deletions(-)

diff --git a/drivers/input/mouse/Kconfig b/drivers/input/mouse/Kconfig
index 366fc7a..db973e5 100644
--- a/drivers/input/mouse/Kconfig
+++ b/drivers/input/mouse/Kconfig

@@ -146,6 +146,16 @@ config MOUSE_PS2_OLPC
  	  If unsure, say N.
 +config MOUSE_PS2_FOCALTECH
+	bool "FocalTech PS/2 mouse protocol extension" if EXPERT
+	default y
+	depends on MOUSE_PS2
+	help
+	  Say Y here if you have a FocalTech PS/2 TouchPad connected to
+	  your system.
+
+	  If unsure, say Y.
+
 config MOUSE_SERIAL
 	tristate "Serial mouse"
 	select SERIO

diff --git a/drivers/input/mouse/focaltech.c

b/drivers/input/mouse/focaltech.c
index f4d657e..ada97cc 100644

--- a/drivers/input/mouse/focaltech.c
+++ b/drivers/input/mouse/focaltech.c

@@ -2,6 +2,7 @@
  * Focaltech TouchPad PS/2 mouse driver
  *
  * Copyright (c) 2014 Red Hat Inc.
+ * Copyright (c) 2014 Mathias Gottschlag <mgottschlag@gmail.com>
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by

@@ -13,15 +14,14 @@
  * Hans de Goede <hdegoede@redhat.com>
  */
 -/*
- * The Focaltech PS/2 touchpad protocol is unknown. This drivers deals with
- * detection only, to avoid further detection attempts confusing the

touchpad
- * this way it at least works in PS/2 mouse compatibility mode.
- */
  #include <linux/device.h>
 #include <linux/libps2.h>
+#include <linux/input/mt.h>
+#include <linux/serio.h>
+#include <linux/slab.h>
 #include "psmouse.h"
+#include "focaltech.h"
  static const char * const focaltech_pnp_ids[] = {
 	"FLT0101",

@@ -30,7 +30,14 @@ static const char * const focaltech_pnp_ids[] = {
 	NULL
 };
 -int focaltech_detect(struct psmouse *psmouse, bool set_properties)
+/*
+ * Even if the kernel is built without support for Focaltech PS/2

touchpads (or
+ * when the real driver fails to recognize the device), we still have
to detect
+ * them in order to avoid further detection attempts confusing the
touchpad.
+ * This way it at least works in PS/2 mouse compatibility mode.
+ */
+
+int focaltech_detect_fallback(struct psmouse *psmouse, bool set_properties)
 {
 	if (!psmouse_matches_pnp_id(psmouse, focaltech_pnp_ids))
 		return -ENODEV;

@@ -43,10 +50,315 @@ int focaltech_detect(struct psmouse *psmouse, bool

set_properties)
 	return 0;
 }
 -int focaltech_init(struct psmouse *psmouse)
+int focaltech_init_fallback(struct psmouse *psmouse)
+{
+	ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_RESET_DIS);
+	psmouse_reset(psmouse);
+
+	return 0;
+}
+

+	state->fingers[finger].x = ((packet[1] & 0xf) << 8) | packet[2];
+	state->fingers[finger].y = (packet[3] << 8) | packet[4];
+	state->fingers[finger].valid = 1;
+}
+static void process_rel_packet(struct focaltech_hw_state *state,
+		unsigned char *packet)
+{
+	int finger1 = ((packet[0] >> 4) & 0x7) - 1;
+	int finger2 = ((packet[3] >> 4) & 0x7) - 1;
+
+	state->pressed = packet[0] >> 7;
+	if (finger1 < FOC_MAX_FINGERS) {
+		state->fingers[finger1].x += (char)packet[1];
+		state->fingers[finger1].y += (char)packet[2];
+	}
+	/*
+	 * If there is an odd number of fingers, the last relative packet only
+	 * contains one finger. In this case, the second finger index in the
+	 * packet is 0 (we subtract 1 in the lines above to create array
+	 * indices).
+	 */
+	if (finger2 != -1 && finger2 < FOC_MAX_FINGERS) {
+		state->fingers[finger2].x += (char)packet[4];
+		state->fingers[finger2].y += (char)packet[5];
+	}
+}
+
+static void focaltech_process_packet(struct psmouse *psmouse)
+{
+	struct focaltech_data *priv = psmouse->private;
+	unsigned char *packet = psmouse->packet;
+
+	switch (packet[0] & 0xf) {
+	case FOC_TOUCH:
+		process_touch_packet(&priv->state, packet);
+		break;
+	case FOC_ABS:
+		process_abs_packet(&priv->state, packet);
+		break;
+	case FOC_REL:
+		process_rel_packet(&priv->state, packet);
+		break;
+	default:
+		psmouse_err(psmouse, "Unknown packet type: %02x", packet[0]);
+		break;
+	}
+
+	focaltech_report_state(psmouse);
+}
+
+static psmouse_ret_t focaltech_process_byte(struct psmouse *psmouse)
 {
+	if (psmouse->pktcnt >= 6) { /* Full packet received */
+		focaltech_process_packet(psmouse);
+		return PSMOUSE_FULL_PACKET;
+	}
+	/*
+	 * we might want to do some validation of the data here, but we do not
+	 * know the protocoll well enough
+	 */
+	return PSMOUSE_GOOD_DATA;
+}
+
+static void focaltech_reset(struct psmouse *psmouse)
+{
+	psmouse_info(psmouse, "focaltech_reset");
 	ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_RESET_DIS);
 	psmouse_reset(psmouse);
+}
+
+static int focaltech_switch_protocol(struct psmouse *psmouse)
+{
+	struct ps2dev *ps2dev = &psmouse->ps2dev;
+	unsigned char param[3];
+
+	param[0] = 0;
+	if (ps2_command(ps2dev, param, 0x10f8))
+		return -EIO;
+	if (ps2_command(ps2dev, param, 0x10f8))
+		return -EIO;
+	if (ps2_command(ps2dev, param, 0x10f8))
+		return -EIO;
+	param[0] = 1;
+	if (ps2_command(ps2dev, param, 0x10f8))
+		return -EIO;
+	if (ps2_command(ps2dev, param, PSMOUSE_CMD_SETSCALE11))
+		return -EIO;
+
+	if (ps2_command(ps2dev, param, PSMOUSE_CMD_ENABLE))
+		return -EIO;
  	return 0;
 }
+
+static void focaltech_disconnect(struct psmouse *psmouse)
+{
+	focaltech_reset(psmouse);
+	kfree(psmouse->private);
+	psmouse->private = NULL;
+}
+
+static int focaltech_reconnect(struct psmouse *psmouse)
+{
+	focaltech_reset(psmouse);
+	if (focaltech_switch_protocol(psmouse)) {
+		psmouse_err(psmouse,
+			    "Unable to initialize the device.");
+		return -1;
+	}
+	return 0;
+}
+
+static void set_input_params(struct psmouse *psmouse)
+{
+	struct input_dev *dev = psmouse->dev;
+
+	__set_bit(EV_KEY, dev->evbit);
+	__set_bit(EV_ABS, dev->evbit);
+	input_set_abs_params(dev, ABS_X, 0, FOC_MAX_X, 0, 0);
+	input_set_abs_params(dev, ABS_Y, 0, FOC_MAX_Y, 0, 0);
+	input_mt_init_slots(dev, 5, INPUT_MT_POINTER);
+	input_set_abs_params(dev, ABS_MT_POSITION_X, 0, FOC_MAX_X, 0, 0);
+	input_set_abs_params(dev, ABS_MT_POSITION_Y, 0, FOC_MAX_Y, 0, 0);
+	__set_bit(BTN_TOUCH, dev->keybit);
+	__set_bit(BTN_TOOL_FINGER, dev->keybit);
+	__set_bit(BTN_TOOL_DOUBLETAP, dev->keybit);
+	__set_bit(BTN_TOOL_TRIPLETAP, dev->keybit);
+	__set_bit(BTN_TOOL_QUADTAP, dev->keybit);
+	__set_bit(BTN_TOOL_QUINTTAP, dev->keybit);
+	__clear_bit(EV_REL, dev->evbit);
+	__clear_bit(REL_X, dev->relbit);
+	__clear_bit(REL_Y, dev->relbit);
+	__set_bit(BTN_LEFT, dev->keybit);
+	__clear_bit(BTN_RIGHT, dev->keybit);
+	__clear_bit(BTN_MIDDLE, dev->keybit);
+	__set_bit(INPUT_PROP_BUTTONPAD, dev->propbit);
+}
+
+int focaltech_init(struct psmouse *psmouse)
+{
+	struct focaltech_data *priv;
+
+	focaltech_reset(psmouse);
+	if (focaltech_switch_protocol(psmouse)) {
+		focaltech_reset(psmouse);
+		psmouse_info(psmouse,
+			     "Unable to initialize the device.");
+		return -ENOSYS;
+	}
+
+	psmouse->private = priv = kzalloc(sizeof(struct focaltech_data),
GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	set_input_params(psmouse);
+
+	psmouse->protocol_handler = focaltech_process_byte;
+	psmouse->pktsize = 6;
+	psmouse->disconnect = focaltech_disconnect;
+	psmouse->reconnect = focaltech_reconnect;
+	psmouse->cleanup = focaltech_reset;
+	/* resync is not supported yet */
+	psmouse->resync_time = 0;
+
+	return 0;
+}
+
+#else /* CONFIG_MOUSE_PS2_FOCALTECH */
+
+int focaltech_detect(struct psmouse *psmouse, bool set_properties)
+{
+	return -ENOSYS;
+}
+
+int focaltech_init(struct psmouse *psmouse)
+{
+	return -ENOSYS;
+}
+
+#endif /* CONFIG_MOUSE_PS2_FOCALTECH */

diff --git a/drivers/input/mouse/focaltech.h

b/drivers/input/mouse/focaltech.h
index 498650c..3c553b2 100644

--- a/drivers/input/mouse/focaltech.h
+++ b/drivers/input/mouse/focaltech.h

@@ -2,6 +2,7 @@
  * Focaltech TouchPad PS/2 mouse driver
  *
  * Copyright (c) 2014 Red Hat Inc.
+ * Copyright (c) 2014 Mathias Gottschlag <mgottschlag@gmail.com>
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by

@@ -16,7 +17,67 @@
 #ifndef _FOCALTECH_H
 #define _FOCALTECH_H
 +/*
+ * Packet types - the numbers are not consecutive, so we might be missing
+ * something here.
+ */
+#define FOC_TOUCH 0x3 /* bitmap of active fingers */
+#define FOC_ABS 0x6 /* absolute position of one finger */
+#define FOC_REL 0x9 /* relative position of 1-2 fingers */
+
+#define FOC_MAX_FINGERS 5
+
+#define FOC_MAX_X 2431
+#define FOC_MAX_Y 1663
+
+static inline int focaltech_invert_y(int y)
+{
+	return FOC_MAX_Y - y;
+}
+
+/*
+ * Current state of a single finger on the touchpad.
+ */
+struct focaltech_finger_state {
+	/* the touchpad has generated a touch event for the finger */
+	bool active;
+	/*
+	 * The touchpad has sent position data for the finger. Touch event
+	 * packages reset this flag for new fingers, and there is a time
+	 * between the first touch event and the following absolute position
+	 * packet for the finger where the touchpad has declared the finger to
+	 * be valid, but we do not have any valid position yet.
+	 */
+	bool valid;
+	/* absolute position (from the bottom left corner) of the finger */
+	unsigned int x;
+	unsigned int y;
+};
+
+/*
+ * Description of the current state of the touchpad hardware.
+ */
+struct focaltech_hw_state {
+	/*
+	 * The touchpad tracks the positions of the fingers for us, the array
+	 * indices correspond to the finger indices returned in the report
+	 * packages.
+	 */
+	struct focaltech_finger_state fingers[FOC_MAX_FINGERS];
+	/*
+	 * True if the clickpad has been pressed.
+	 */
+	bool pressed;
+};
+
+struct focaltech_data {
+	struct focaltech_hw_state state;
+};
+
 int focaltech_detect(struct psmouse *psmouse, bool set_properties);
 int focaltech_init(struct psmouse *psmouse);
 +int focaltech_detect_fallback(struct psmouse *psmouse, bool

set_properties);
+int focaltech_init_fallback(struct psmouse *psmouse);
+
 #endif

diff --git a/drivers/input/mouse/psmouse-base.c

b/drivers/input/mouse/psmouse-base.c
index 26994f6..2e2b98d 100644

--- a/drivers/input/mouse/psmouse-base.c
+++ b/drivers/input/mouse/psmouse-base.c

@@ -726,6 +726,12 @@ static int psmouse_extensions(struct psmouse *psmouse,
 /* Always check for focaltech, this is safe as it uses pnp-id matching */
 	if (psmouse_do_detect(focaltech_detect, psmouse, set_properties) == 0) {
 		if (!set_properties || focaltech_init(psmouse) == 0) {
+			return PSMOUSE_FOCALTECH;
+		}
+	}
+	if (psmouse_do_detect(focaltech_detect_fallback,
+			      psmouse, set_properties) == 0) {
+		if (!set_properties || focaltech_init_fallback(psmouse) == 0) {
 			/*
 			 * Not supported yet, use bare protocol.
 			 * Note that we need to also restrict

@@ -1063,6 +1069,15 @@ static const struct psmouse_protocol

psmouse_protocols[] = {
 		.alias		= "cortps",
 		.detect		= cortron_detect,
 	},
+#ifdef CONFIG_MOUSE_PS2_FOCALTECH
+	{
+		.type		= PSMOUSE_FOCALTECH,
+		.name		= "FocalTechPS/2",
+		.alias		= "focaltech",
+		.detect		= focaltech_detect,
+		.init		= focaltech_init,
+	},
+#endif
 	{
 		.type		= PSMOUSE_AUTO,
 		.name		= "auto",

diff --git a/drivers/input/mouse/psmouse.h b/drivers/input/mouse/psmouse.h
index f4cf664..c2ff137 100644
--- a/drivers/input/mouse/psmouse.h
+++ b/drivers/input/mouse/psmouse.h

@@ -96,6 +96,7 @@ enum psmouse_type {
 	PSMOUSE_FSP,
 	PSMOUSE_SYNAPTICS_RELATIVE,
 	PSMOUSE_CYPRESS,
+	PSMOUSE_FOCALTECH,
 	PSMOUSE_AUTO		/* This one should always be last */
 };