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: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

1 files changed, 52 insertions, 0 deletions

diff --git a/drivers/input/mouse/focaltech.c b/drivers/input/mouse/focaltech.c
new file mode 100644
index 0000000..f4d657e
--- /dev/null
+++ b/drivers/input/mouse/focaltech.c
@@ -0,0 +1,52 @@
+/*
+ * 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;
+}