linux-kernel - Re: [PATCH v3 3/3] ALSA: hda: add support for Huawei WMI micmute LED

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Date:   Tue, 20 Nov 2018 13:19:26 +0100
From:   Takashi Iwai <tiwai@...e.de>
To:     Pavel Machek <pavel@....cz>
Cc:     Ayman Bagabas <ayman.bagabas@...il.com>,
        alsa-devel@...a-project.org, Hui Wang <hui.wang@...onical.com>,
        Andy Shevchenko <andy@...radead.org>,
        Darren Hart <dvhart@...radead.org>,
        Jaroslav Kysela <perex@...ex.cz>,
        Kailang Yang <kailang@...ltek.com>,
        linux-kernel@...r.kernel.org, platform-driver-x86@...r.kernel.org
Subject: Re: [PATCH v3 3/3] ALSA: hda: add support for Huawei WMI micmute LED

On Tue, 20 Nov 2018 12:51:59 +0100,
Pavel Machek wrote:
> 
> Hi!
> 
> > > You have general-purpose LED, yet you are treating it as "something
> > > special". That means ugly code (quoted above) and lack of flexibility.
> > > 
> > > For example, if my notebook lacks HDD LED, I can use scrollock LED for
> > > that instead. Or, in reverse way, maybe "mic mute" LED is not useful
> > > for me, and I'd like to use it for notifications instead.
> > 
> > I'm not against adding the LEDs device implementation for any exotic
> > usage.
> > 
> > But for the audio mute LED features, you'll need really lots of other
> > works if it were implemented via leds device.  That's the hardest
> > part, and a few lines of hooks solves it easily in the kernel side.
> > That's all about it.
> > 
> > If you are ready for submitting the real solutions in user-space side
> > (patching PulseAudio and whatever all existing sound daemons, and
> > creating yet another daemon for non-PA systems (another footprint,
> > lovely), and so on), we can happily delete such in-kernel hooks :)
> 
> I'm not saying we should move it to the userspace.
> 
> I'm saying this should be "normal" led. drivers/leds/led-huawei-acpi.c,
> or something. Perhaps this acpi stuff is so similar you don't really
> need .c code.
> 
> And then there should be a "mic muted" trigger. Similar to
> drivers/leds/trigger/ledtrig-disk.c.

And who will trigger this, e.g. when the mixer is muted?


Takashi