[PATCH 4.4 13/38] Revert "staging: nvec: ps2: change serio type to passthrough"

[Greg Kroah-Hartman]

4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Paul Fertser <fercerpav@xxxxxxxxx>

commit 17c1c9ba15b238ef79b51cf40d855c05b58d5934 upstream.

This reverts commit 36b30d6138f4677514aca35ab76c20c1604baaad.

This is necessary to detect paz00 (ac100) touchpad properly as one
speaking ETPS/2 protocol. Without it X.org's synaptics driver doesn't
work as the touchpad is detected as an ImPS/2 mouse instead.

Commit ec6184b1c717b8768122e25fe6d312f609cc1bb4 changed the way
auto-detection is performed on ports marked as pass through and made the
issue apparent.

A pass through port is an additional PS/2 port used to connect a slave
device to a master device that is using PS/2 to communicate with the
host (so slave's PS/2 communication is tunneled over master's PS/2
link). "Synaptics PS/2 TouchPad Interfacing Guide" describes such a
setup (PS/2 PASS-THROUGH OPTION section).

Since paz00's embedded controller is not connected to a PS/2 port
itself, the PS/2 interface it exposes is not a pass-through one.

Signed-off-by: Paul Fertser <fercerpav@xxxxxxxxx>
Acked-by: Marc Dietrich <marvin24@xxxxxx>
Fixes: 36b30d6138f4 ("staging: nvec: ps2: change serio type to passthrough")
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 drivers/staging/nvec/nvec_ps2.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/staging/nvec/nvec_ps2.c
+++ b/drivers/staging/nvec/nvec_ps2.c
@@ -111,7 +111,7 @@ static int nvec_mouse_probe(struct platf
 	if (!ser_dev)
 		return -ENOMEM;
 
-	ser_dev->id.type = SERIO_PS_PSTHRU;
+	ser_dev->id.type = SERIO_8042;
 	ser_dev->write = ps2_sendcommand;
 	ser_dev->start = ps2_startstreaming;
 	ser_dev->stop = ps2_stopstreaming;