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From: Hans de Goede <hdegoede@redhat.com>
Date: Fri, 27 Jun 2014 18:50:33 +0200
Subject: [PATCH] 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: Hans de Goede <hdegoede@redhat.com>
---
 drivers/input/mouse/Makefile       |  2 +-
 drivers/input/mouse/focaltech.c    | 44 ++++++++++++++++++++++++++++++++++++++
 drivers/input/mouse/focaltech.h    | 21 ++++++++++++++++++
 drivers/input/mouse/psmouse-base.c | 10 +++++++++
 4 files changed, 76 insertions(+), 1 deletion(-)
 create mode 100644 drivers/input/mouse/focaltech.c
 create mode 100644 drivers/input/mouse/focaltech.h

diff --git a/drivers/input/mouse/Makefile b/drivers/input/mouse/Makefile
index c25efdb3f288..dda507f8b3a2 100644
--- a/drivers/input/mouse/Makefile
+++ b/drivers/input/mouse/Makefile
@@ -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
diff --git a/drivers/input/mouse/focaltech.c b/drivers/input/mouse/focaltech.c
new file mode 100644
index 000000000000..d83a23554d63
--- /dev/null
+++ b/drivers/input/mouse/focaltech.c
@@ -0,0 +1,44 @@
+/*
+ * 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;
+}
diff --git a/drivers/input/mouse/focaltech.h b/drivers/input/mouse/focaltech.h
new file mode 100644
index 000000000000..0d0fc49451fe
--- /dev/null
+++ b/drivers/input/mouse/focaltech.h
@@ -0,0 +1,21 @@
+/*
+ * 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);
+
+#endif
diff --git a/drivers/input/mouse/psmouse-base.c b/drivers/input/mouse/psmouse-base.c
index 02e68c3008a3..2c8c8e2172a2 100644
--- a/drivers/input/mouse/psmouse-base.c
+++ b/drivers/input/mouse/psmouse-base.c
@@ -35,6 +35,7 @@
 #include "elantech.h"
 #include "sentelic.h"
 #include "cypress_ps2.h"
+#include "focaltech.h"
 
 #define DRIVER_DESC	"PS/2 mouse driver"
 
@@ -722,6 +723,13 @@ 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) {
+		/* Not supported yet, use bare protocol */
+		psmouse_max_proto = max_proto = PSMOUSE_PS2;
+		goto reset_to_defaults;
+	}
+
 /*
  * We always check for lifebook because it does not disturb mouse
  * (it only checks DMI information).
@@ -873,6 +881,8 @@ static int psmouse_extensions(struct psmouse *psmouse,
 		}
 	}
 
+reset_to_defaults:
+
 /*
  * Reset to defaults in case the device got confused by extended
  * protocol probes. Note that we follow up with full reset because
-- 
1.9.3