linux-kernel - Re: Dell Vostro 3360 multimedia keys

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Message-ID: <1629929.m6cr89zbSo@natalenko.name>
Date:   Tue, 21 Nov 2017 19:58:24 +0100
From:   Oleksandr Natalenko <oleksandr@...alenko.name>
To:     Pali Rohár <pali.rohar@...il.com>
Cc:     Mario Limonciello <mario_limonciello@...l.com>,
        platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org,
        Matthew Garrett <mjg59@...f.ucam.org>,
        Darren Hart <dvhart@...radead.org>,
        Andy Shevchenko <andy@...radead.org>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>
Subject: Re: Dell Vostro 3360 multimedia keys

Hi.

On úterý 21. listopadu 2017 19:36:24 CET Pali Rohár wrote:
> Ok, if wmi_requires_smbios_request is really doing nothing, then it
> should not be used. It enables some QSET feature in Dell SMM mode which
> is for 2 laptops.

It is also used to filter 0xe025 key code which is generated by 3rd key and is 
visible via both atkbd and wmi:

===
343     if (type == 0x0000 && code == 0xe025 && !wmi_requires_smbios_request)
344         return;
===

(see commit 13f5059ac5a6b)

> Looks like that Dell Vostro 3360 have this meaning for multimedia keys:
> 
> first key: Mobility Center
> second key: Dell Support Center
> third key: Dell Instant Launch Manager
> 
> (same as other Vostro laptops)

Likely, yes. At least, for Launch Manager (key "3") there is a record in the 
table:

===
135     /* Dell Instant Launch key */
136     { KE_KEY,    0xe025, { KEY_PROG4 } },
===

As for Mobility Center, relevant key is commented out and has completely 
different keycode:

===
150     /* Untested, Windows Mobility Center button on Inspiron 7520 */
151     /* { KE_IGNORE, 0xe02a, { KEY_RESERVED } }, */
===

For Support Center, it is not commented, but still reserved:

===
189     /* Dell Support Center key */
190     { KE_IGNORE, 0xe06e, { KEY_RESERVED } },
===

> But do not know what KEY_* are used on other Vostro laptops for those
> keys. It would be great to use same KEY_*...

So, according to what I see above, it looks like KEY_PROG(X) pattern should be 
followed.

> > Well, I've tried. The problem is that if I even configure this key
> > via setkeycodes, it doesn't work.
> 
> Hm... why it does not work?
> 
> CCing Dmitry, can you tell us what needs to be done to "active" key from
> AT Keyboard driver which prints following messages to dmesg?

Just to note what I did. Here is my custom /etc/udev/hwdb.d/90-dell-
vostro-3360.hwdb:

===
evdev:atkbd:dmi:bvnDellInc.:bvrA18:bd09/25/2013:svnDellInc.:pnVostro3360:pvr:rvnDellInc.:rn0F5DWF:rvrA00:cvnDellInc.:ct8:cvr0.1:
  KEYBOARD_KEY_60=prog4
===

Here is how this key press is being detected by evtest via atkbd:

===
Event: time 1511289883.083968, type 4 (EV_MSC), code 4 (MSC_SCAN), value 60
Event: time 1511289883.083968, type 1 (EV_KEY), code 203 (KEY_PROG4), value 2
Event: time 1511289883.083968, -------------- SYN_REPORT ------------
===

But xev shows nothing when I press this key. Am I doing something wrong?

> In dell-wmi we filter all key events which are also delivered via PS/2
> AT Keyboard driver. So filtering PS/2 keys instead of WMI is anti-design
> solution.

Well, sounds reasonable...

Thanks.

Regards,
  Oleksandr