general remote control mechanism (was: Re: [linux-dvb] Hauppauge Nova-T PCI on Fedora Core 3)

Johannes Stezenbach js at
Sun Mar 6 23:21:11 CET 2005

Patrick Boettcher wrote:
> On Sun, 6 Mar 2005, Lauri Tischler wrote:
> >Wouldn't it be much easier to have separate tables for each remote
> >and then be able select at runtime which remote to use.
> >Now there is no usefull remote at all, unless you go and hack
> >the kernel.
> Yeah, that would be great. Maybe the code-tables can be passed via 
> /proc-interface to the driver. dvb-apps then could provide a learning 
> tool, which generates the tables.
> The dibusb-driver has its own remote-input-stuff, the cingeryT2.c does 
> exactly the same, but both don't use dynamic key-assignments.
> Maybe there should something like a generic rc library/module for the 
> dvb-stuff (or even at a higher layer inside the kernel).
> It should be able to handle different remote-control-protocols (ie. 
> different rc-key-to-input-event-tables-formats, I know of NEC and a 
> Hauppauge specific one (used in NOVA-T USB2), I assume there are more).

We have dvb-apps/util/av7110_loadkeys, but it makes no sense to
replicate this for each card. I remember there was some discussion about
IR input and configurable keymaps on lkml a long time ago, but no one came
forward and implemented something.
Gerd Knorr wrote drivers/media/common/ir-common.c, which might
be reusable/extendable for DVB.

> Will lirc ever be inside the stock kernel? Is lirc an option for such 
> things?

There is a difference between traditional LIRC drivers, which
output raw samples from an IR receiver to be interpreted
by userspace software (which is very flexible), and the
IR drivers we have for DVB, which output decoded rc5 (or similar) codes.

IMHO it makes sense to feed rc5 events to the linux-input
system via a keymap. We should either have some generic module
to allow user-settable keymaps, or it could be implemented
in userspace as a daemon which reads from /dev/input/eventX
(using EVIOCGRAB), does the key mapping and feeds back
to /dev/input/uevent. I don't know if there's already
some software which does this, or if the lirc folks
are interested in this.


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