Commit 3ace3686 authored by Hans de Goede's avatar Hans de Goede Committed by Dmitry Torokhov
Browse files

Input: psmouse - add support for detecting FocalTech PS/2 touchpads 

The Asus X450 and X550 laptops use a PS/2 touchpad from a new
manufacturer called FocalTech:

https://bugzilla.kernel.org/show_bug.cgi?id=77391
https://bugzilla.redhat.com/show_bug.cgi?id=1110011



The protocol for these devices is not known at this time, but even
without knowing the protocol they need some special handling. They get
upset by some of our other PS/2 device probing, and once upset generate
random mouse events making things unusable even with an external mouse.

This patch adds detection of these devices based on their pnp ids, and
when they are detected, treats them as a bare ps/2 mouse. Doing things
this way they at least work in their ps/2 mouse emulation mode.

Signed-off-by: default avatarHans de Goede <hdegoede@redhat.com>
Signed-off-by: default avatarDmitry Torokhov <dmitry.torokhov@gmail.com>
parent 2c75ada6

drivers/input/mouse/Makefile

+1 −1
Original line number Diff line number Diff line
@@ -23,7 +23,7 @@ obj-$(CONFIG_MOUSE_SYNAPTICS_I2C) += synaptics_i2c.o 
obj-$(CONFIG_MOUSE_SYNAPTICS_USB)	+= synaptics_usb.o

obj-$(CONFIG_MOUSE_VSXXXAA)		+= vsxxxaa.o



psmouse-objs := psmouse-base.o synaptics.o

psmouse-objs := psmouse-base.o synaptics.o focaltech.o



psmouse-$(CONFIG_MOUSE_PS2_ALPS)	+= alps.o

psmouse-$(CONFIG_MOUSE_PS2_ELANTECH)	+= elantech.o

drivers/input/mouse/focaltech.c

0 → 100644
+52 −0
Original line number Diff line number Diff line 
/*

 * Focaltech TouchPad PS/2 mouse driver

 *

 * Copyright (c) 2014 Red Hat Inc.

 *

 * 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

 * the Free Software Foundation; either version 2 of the License, or

 * (at your option) any later version.

 *

 * Red Hat authors:

 *

 * 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 "psmouse.h"



static const char * const focaltech_pnp_ids[] = {

	"FLT0101",

	"FLT0102",

	"FLT0103",

	NULL

};



int focaltech_detect(struct psmouse *psmouse, bool set_properties)

{

	if (!psmouse_matches_pnp_id(psmouse, focaltech_pnp_ids))

		return -ENODEV;



	if (set_properties) {

		psmouse->vendor = "FocalTech";

		psmouse->name = "FocalTech Touchpad in mouse emulation mode";

	}



	return 0;

}



int focaltech_init(struct psmouse *psmouse)

{

	ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_RESET_DIS);

	psmouse_reset(psmouse);



	return 0;

}

drivers/input/mouse/focaltech.h

0 → 100644
+22 −0
Original line number Diff line number Diff line 
/*

 * Focaltech TouchPad PS/2 mouse driver

 *

 * Copyright (c) 2014 Red Hat Inc.

 *

 * 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

 * the Free Software Foundation; either version 2 of the License, or

 * (at your option) any later version.

 *

 * Red Hat authors:

 *

 * Hans de Goede <hdegoede@redhat.com>

 */



#ifndef _FOCALTECH_H

#define _FOCALTECH_H



int focaltech_detect(struct psmouse *psmouse, bool set_properties);

int focaltech_init(struct psmouse *psmouse);



#endif

drivers/input/mouse/psmouse-base.c

+16 −0
Original line number Diff line number Diff line
@@ -35,6 +35,7 @@ 
#include "elantech.h"

#include "sentelic.h"

#include "cypress_ps2.h"

#include "focaltech.h"



#define DRIVER_DESC	"PS/2 mouse driver"
@@ -720,6 +721,21 @@ static int psmouse_extensions(struct psmouse *psmouse, 
{

	bool synaptics_hardware = false;



/* 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) {

			/*

			 * Not supported yet, use bare protocol.

			 * Note that we need to also restrict

			 * psmouse_max_proto so that psmouse_initialize()

			 * does not try to reset rate and resolution,

			 * because even that upsets the device.

			 */

			psmouse_max_proto = PSMOUSE_PS2;

			return PSMOUSE_PS2;

		}

	}



/*

 * We always check for lifebook because it does not disturb mouse

 * (it only checks DMI information).

CRA Git | Maintained and supported by SUSTech CRA and CCSE