[linux-dvb] Nebula DigiTv PCI Remote Control

Mark Weaver mark-clist at npsl.co.uk
Thu Sep 15 19:48:51 CEST 2005

Richard Wall wrote:
> Does the Nebula DigiTV PCI driver include code for the remote control?
> It isn't showing up at /dev/input/event0.
> I'm using kernel with DVB patches applied on Debian Unstable.
AFAICT it is not supported by either the ir-kbd-gpio driver or LIRC.

> If not supported should I follow this guide...
> http://www.linuxtv.org/v4lwiki/index.php/Remote_controllers
> ...for creating the keymap?
The card does not have an SAA7134 on it so that won't help.

TBH, looking at the card I can't figure out what the remote control
input actually ends up being connected to.  This is what I can figure out:

There is a 3-pin IR demodulator of some variety which plugs into a jack
on the card.
I'm not sure where the output from the jack gets routed to.

Other devices on the card are:

- Tuner, in the tin box (alps something or other I believe)
- A 7474 flip flop
- A 7408 AND gate
- An 24C0[4?] EEPROM (what's that for, anyway?)
- An MT352 demodulator
- A bt878

The rest of it is just a bunch of capacitors, resistors, etc.

I would have been expecting to see something like a PIC or other chip
connected to the IR demodulator, then the output of that connected
to some of the GPIO pins of the bt878.  At least, I'm assuming
that's the way it works on other cards.

It doesn't look like this is the case though.  Most of the GPIO pins are
unconnected.  The ones that I can trace go to the MPEG output of the
MT352 (as expected).  There are about 3 that wonder off towards the
flip-flop, but again, I can't trace those.

Does anyone have any clue how they might be handling the remote from
that description?

I asked Nebula for some information on this, but they haven't come up
with anything so far (in about a month) so I don't expect that they will.



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