linux-kernel - [PATCH 3.12 059/127] Revert "staging: nvec: ps2: change serio type to passthrough"

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Message-Id: <0cd002e7684d4170c6a990cdc174fb63648479c0.1480062521.git.jslaby@suse.cz>
Date:   Fri, 25 Nov 2016 09:29:32 +0100
From:   Jiri Slaby <jslaby@...e.cz>
To:     stable@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, Paul Fertser <fercerpav@...il.com>,
        Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 059/127] Revert "staging: nvec: ps2: change serio type to passthrough"

From: Paul Fertser <fercerpav@...il.com>

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

===============

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@...il.com>
Acked-by: Marc Dietrich <marvin24@....de>
Fixes: 36b30d6138f4 ("staging: nvec: ps2: change serio type to passthrough")
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 drivers/staging/nvec/nvec_ps2.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/staging/nvec/nvec_ps2.c b/drivers/staging/nvec/nvec_ps2.c
index 89bfc0625be7..90e7d841825b 100644
--- a/drivers/staging/nvec/nvec_ps2.c
+++ b/drivers/staging/nvec/nvec_ps2.c
@@ -109,7 +109,7 @@ static int nvec_mouse_probe(struct platform_device *pdev)
 	if (ser_dev == NULL)
 		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;
-- 
2.10.2