linux-kernel - [PATCH] Input: psmouse - add small delay for IBM trackpoint pass-through mode

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-Id: <1439649618-3366-1-git-send-email-sassmann@kpanic.de>
Date:	Sat, 15 Aug 2015 16:40:18 +0200
From:	Stefan Assmann <sassmann@...nic.de>
To:	linux-input@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, dmitry.torokhov@...il.com,
	sassmann@...nic.de
Subject: [PATCH] Input: psmouse - add small delay for IBM trackpoint pass-through mode

There are trackpoint devices that fail to respond to the PS2 command
PSMOUSE_CMD_GETID if immediately queried after the parent device is
deactivated. Add a small delay for the hardware to get in a sane state
before sending any PS2 commands.

One example of such a system is:
Lenovo ThinkPad X120e, model 30515QG
synaptics: Touchpad model: 1, fw: 8.0, id: 0x1e2b1, caps: 0xd001a3/0x940300/0x121c00, board id: 1811, fw id: 797391

Signed-off-by: Stefan Assmann <sassmann@...nic.de>
---
 drivers/input/mouse/psmouse-base.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/input/mouse/psmouse-base.c b/drivers/input/mouse/psmouse-base.c
index ec347703..ad18dab 100644
--- a/drivers/input/mouse/psmouse-base.c
+++ b/drivers/input/mouse/psmouse-base.c
@@ -1540,6 +1540,10 @@ static int psmouse_connect(struct serio *serio, struct serio_driver *drv)
 	if (error)
 		goto err_clear_drvdata;
 
+	/* give PT device some time to settle down before probing */
+	if (serio->id.type == SERIO_PS_PSTHRU)
+		usleep_range(10000, 15000);
+
 	if (psmouse_probe(psmouse) < 0) {
 		error = -ENODEV;
 		goto err_close_serio;
-- 
2.4.3

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/