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Date:      Wed, 27 Sep 2017 15:58:44 +0000
From:      bugzilla-noreply@freebsd.org
To:        freebsd-bugs@FreeBSD.org
Subject:   [Bug 222646] ukbd(4): support Consumer Control based multimedia keys
Message-ID:  <bug-222646-8@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D222646

            Bug ID: 222646
           Summary: ukbd(4): support Consumer Control based multimedia
                    keys
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs@FreeBSD.org
          Reporter: greg@unrelenting.technology

Created attachment 186765
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=3D186765&action=
=3Dedit
ukbd_consumer_ctl.patch

This patch adds support for media keys (such as play/pause, next/prev track,
volume up/down) on USB keyboards where they're implemented as HID Consumer
Control reports by converting them into plain old key presses of matching k=
eys.

Background: my mouse (Logitech G402) pretends to also be a keyboard, to all=
ow
two programmable extra buttons to press any keyboard key. One of the options
for these keys is volume control, and I really like that. These key presses
were not recognized by the FreeBSD kernel. With this patch,
libinput-debug-events shows them as KEY_VOLUMEDOWN (114) and KEY_VOLUMEUP
(115), just like on Linux, and my XF86AudioRaise(Lower)Volume bindings in X=
org
work fine! Nothing in this patch is evdev specific though, it literally
translates these events to key presses.

Also: I have a wireless keyboard that pretends to also be a mouse (=E2=80=
=A6yeah), and
for the media keys, it sends identical packets, but through a ums device. T=
ried
to do a similar thing (but evdev-only, since the normal mouse interface can=
't
press keys I guess) in the ums driver, wasted several hours only to encount=
er
weird problems=E2=80=A6 hid_locate couldn't even find the stuff, though it'=
s clearly
there (uhidd recognizes it fine!). After removing the "Only copy HID item,
increment position and return if correct kindset" check from hid_get_item,
hid_locate "found" it but returned wrong data=E2=80=A6 So screw that for no=
w, hopefully
most input devices use ukbd for media keys :D

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