Thread (31 messages) 31 messages, 6 authors, 2009-12-09

Re: [RFC] Should we create a raw input interface for IR's ? - Was: Re: [PATCH 1/3 v2] lirc core device driver infrastructure

From: Andy Walls <hidden>
Date: 2009-12-08 12:37:50
Also in: linux-media, lkml

Possibly related (same subject, not in this thread)

On Mon, 2009-12-07 at 20:22 -0800, Dmitry Torokhov wrote:
On Mon, Dec 07, 2009 at 09:42:22PM -0500, Andy Walls wrote:
quoted
So I'll whip up an RC-6 Mode 6A decoder for cx23885-input.c before the
end of the month.

I can setup the CX2388[58] hardware to look for both RC-5 and RC-6 with
a common set of parameters, so I may be able to set up the decoders to
handle decoding from two different remote types at once.  The HVR boards
can ship with either type of remote AFAIK.

I wonder if I can flip the keytables on the fly or if I have to create
two different input devices?
Can you distinguish between the 2 remotes (not receivers)?
Yes.  RC-6 and RC-5 are different enough to distinguish between the two.
(Honestly I could pile on more protocols that have similar pulse time
periods, but that's complexity for no good reason and I don't know of a
vendor that bundles 3 types of remotes per TV card.)

 Like I said,
I think the preferred way is to represent every remote that can be
distinguished from each other as a separate input device.
OK.  With RC-5, NEC, and RC-6 at least there is also an address or
system byte or word to distingish different remotes.  However creating
multiple input devices on the fly for detected remotes would be madness
- especially with a decoding error in the address bits.  

Any one vendor usually picks one address for their bundled remote.
Hauppaugue uses address 0x1e for it's RC-5 remotes AFAICT.


 Applications
expect to query device capabilities and expect them to stay somewhat
stable (we do support keymap change but I don't think anyone expectes
flip-flopping).
OK.
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