linux-kernel - RE: Unknown ALPS touchpad

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Date:   Tue, 21 Feb 2017 03:10:06 +0000
From:   Masaki Ota <masaki.ota@...alps.com>
To:     Pali Rohár <pali.rohar@...il.com>,
        Marcos Paulo de Souza <marcos.souza.org@...il.com>
CC:     John Preston <wcerfgba@...eup.net>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        "linux-input@...r.kernel.org" <linux-input@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: Unknown ALPS touchpad

Hi, Pali,

I know these devices, and they are supported in new kernel.
I'm not sure when they are supported from.
In alps.c has below code.

static int alps_identify(struct psmouse *psmouse, struct alps_data *priv)
{...
...
		if (e7[0] == 0x73 && e7[1] == 0x03 && e7[2] == 0x50 &&
			   ec[0] == 0x73 && (ec[1] == 0x01 || ec[1] == 0x02)) {
			protocol = &alps_v5_protocol_data;
		} else if (ec[0] == 0x88 &&
			   ((ec[1] & 0xf0) == 0xb0 || (ec[1] & 0xf0) == 0xc0)) {
			protocol = &alps_v7_protocol_data;}
}

E7=73 03 50, EC=73 02 02 <- alps_v5_protocol_data
E7=73 03 0a, EC=88 b3 22 <- alps_v7_protocol_data
E7=73 03 0a, EC=88 b3 18 <- alps_v7_protocol_data

Best Regards,
Masaki Ota
-----Original Message-----
From: Pali Rohár [mailto:pali.rohar@...il.com] 
Sent: Tuesday, February 21, 2017 12:51 AM
To: Marcos Paulo de Souza <marcos.souza.org@...il.com>; 太田 真喜 Masaki Ota <masaki.ota@...alps.com>
Cc: John Preston <wcerfgba@...eup.net>; Dmitry Torokhov <dmitry.torokhov@...il.com>; linux-input@...r.kernel.org; linux-kernel@...r.kernel.org
Subject: Unknown ALPS touchpad

Adding Masaki into discussion.

On Sunday 19 February 2017 20:01:07 Marcos Paulo de Souza wrote:
> There are other open bugs mentioning the same problem, with similar ALPS devices:
> https://bugzilla.kernel.org/show_bug.cgi?id=57841

Unknown ALPS touchpad: E7=73 03 50, EC=73 02 02

> https://bugzilla.kernel.org/show_bug.cgi?id=43931

Unknown ALPS touchpad: E7=73 00 14, EC=10 00 64

Should be supported since commit 95f75e91 which was introduced in Linux version v3.13-rc4.

> https://bugzilla.kernel.org/show_bug.cgi?id=80181

Unknown ALPS touchpad: E7=73 03 0a, EC=88 b3 22

> https://bugzilla.kernel.org/show_bug.cgi?id=67941

Unknown ALPS touchpad: E7=73 03 0a, EC=88 b3 18

> This one without even a dmesg output:
> https://bugzilla.kernel.org/show_bug.cgi?id=84081

Sorry, this one does not contain any useful information.

> Maybe they are related, or  also need some touch to let them being discovered as proper devices?

Masaki, can you look at those unknown ALPS touchpad identifiers and provide some information about protocol which they are using?

Basically touchpads with these identifiers are unsupported by last kernel version:

E7=73 03 50, EC=73 02 02
E7=73 03 0a, EC=88 b3 22
E7=73 03 0a, EC=88 b3 18

--
Pali Rohár
pali.rohar@...il.com