Re: [PATCH 0/6] media: ite-cir driver cleanups

From: Sean Young <sean@mess.org>
To: Matthias Reichl <hias@horus.com>
Cc: linux-media@vger.kernel.org,
	"Juan Jesús García de Soria" <skandalfo@gmail.com>
Subject: Re: [PATCH 0/6] media: ite-cir driver cleanups
Date: Wed, 24 Feb 2021 09:57:47 +0000	[thread overview]
Message-ID: <20210224095747.GA22904@gofer.mess.org> (raw)
In-Reply-To: <20210223191615.GA9243@lenny.lan>

Hi Hias,

On Tue, Feb 23, 2021 at 08:16:15PM +0100, Matthias Reichl wrote:
> Hi Sean,
> 
> On Tue, Feb 23, 2021 at 05:50:01PM +0000, Sean Young wrote:
> > On Tue, Feb 23, 2021 at 05:13:07PM +0100, Matthias Reichl wrote:
> > > I could only test receiving (don't have a transmitter on that PC)
> > > and also couldn't test the carrier options (I'm using a demodulating
> > > TSOP receiver here), but your changes look sane to me.
> > 
> > I only have got an eeepc box, with the same limitations. Do you happen to
> > know what hardware there is for this driver? It would be nice to test this
> > properly.
> > 
> > This is the only IR driver that can change the RX carrier range, so it's
> > kinda interesting.
> 
> In the most recent bug report I got (about a month ago) the user was
> using an intel NUC (NUC10i3FNH/NUC10i3FNB according to DMI):
> https://forum.libreelec.tv/thread/23211-intel-nightly-build-problem-with-mce-remote/?postID=148823#post148823
> 
> I've also seen NUCs with Nuvoton CIR though and I suspect they'll
> all probably have a demodulating receiver soldered directly to the
> board, so probably not easy to tinker with (haven't checked though).
> 
> I have only an ancient Pentium 4 mainboard (Gigabyte 8IPE775) with
> an IT8712 here. IR RX/TX and CIR RX/TX are all exposed on a header,
> but the BIOS is somewhat odd and doesn't contain CIR on/off settings
> or announce the CIR via ACPI. So I had to manually patch ACPI tables
> to get that beast working.... ITE8713 pnpid was close enough (couldn't
> find a datasheet for 8713, only 8712 - that does mention demodulating
> though).
> 
> I don't think I have a simple IR diode or transistor here to easily
> test that, only demodulating TSOPs (and some clones) - hooking that
> up to the mainboard wouldn't be too hard.

That's a good point, that's probably the way to go. I'll have a look at
modifying my eeepc box.

Having said that, if all the hardware out there uses TSOP-type IR
receivers, I'm not sure how much use there is having this hooked up in
the driver; same for transmit.

Sean