On Wed, 2009-11-25 at 13:20 -0500, Devin Heitmueller wrote:
> On Wed, Nov 25, 2009 at 1:07 PM, Jarod Wilson <ja...@wilsonet.com> wrote:
> > Took me a minute to figure out exactly what you were talking about. You're 
> > referring to the current in-kernel decoding done on an ad-hoc basis for 
> > assorted remotes bundled with capture devices, correct?
> >
> > Admittedly, unifying those and the lirc driven devices hasn't really been 
> > on my radar.
> This is one of the key use cases I would be very concerned with.  For
> many users who have bought tuner products, the bundled remotes work
> "out-of-the-box", regardless of whether lircd is installed.  I have no
> objection so much as to saying "well, you have to install the lircd
> service now", but there needs to be a way for the driver to
> automatically tell lirc what the default remote control should be, to
> avoid a regression in functionality.  We cannot go from a mode where
> it worked automatically to a mode where now inexperienced users now
> have to deal with the guts of getting lircd properly configured.
> If such an interface were available, I would see to it that at least
> all the devices I have added RC support for will continue to work
> (converting the in-kernel RC profiles to lirc RC profiles as needed
> and doing the associations with the driver).
> The other key thing I don't think we have given much thought to is the
> fact that in many tuners, the hardware does RC decoding and just
> returns NEC/RC5/RC6 codes.  And in many of those cases, the hardware
> has to be configured to know what format to receive.  We probably need
> some kernel API such that the hardware can tell lirc what formats are
> supported, and another API call to tell the hardware which mode to
> operate in.

Please think about how we would need to augment the v4l_subdev_ir_ops:


I think encapsulation of the various IR devices under V4L-DVB into
v4l_subdevices can facilitate your suggestions.

The CX23888 IR subdevice code configures itself to a single default
setup for Tx and Rx:


but there isn't a reason V4L2 IR subdevices couldn't configure to a per
"product" defaults based on information about the detected card from the
main bridge driver code.


> This is why I think we really should put together a list of use cases,
> so that we can see how any given proposal addresses those use cases.
> I offered to do such, but nobody seemed really interested in this.
> Devin

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