[linux-dvb] Re: Getting IR-codes directly from DVB-S?

[Oliver Endriss <o.endriss@gmx.de>]

On Sunday 12 October 2003 10:35, Holger Waechtler wrote:
> Oliver Endriss wrote:
> > 
> > The current implementation has a number of restrictions:
> > - Permissions of /proc/av7110_ir cannot be changed without recompiling
> >   the driver, i.e. chown/chmod do not work.
> > - Only one keymap can be loaded for all devices.
> > 
> > What about loading keymaps using the ioctl interface of the event
> > device? This would require a new evdev ioctl which could be passed to
> > the low-level input device driver (i.e. av7110_ir.c). This way access
> > control of the evdev driver could be used for the keymap interface, too.
> > (I don't know whether Vojtech would accept this.)
> 
> Can you please prepare a simple patch doing this? I'm sure Vojtech will 
> comment this and include it if it's properly implemented. Maybe you need 
> to explain him the problem of loading RC5/RCMM keycode tables for remote 
> controls again a little more in detail.

Let's see what he thinks about this issue. If he likes this idea, I'll
prepare a patch.

Basically we need keymaps because remote controls are not really
standardized. We need a configuration interface to define the 
raw code <-> key code mappings, and some other parameters (device
address, signal inversion).

> btw: I still believe that it's useful in some environments to load 
> keymaps for all users at boot time -- maybe all keycode configuration 
> ioctl's should override the default keymap which gets used until a 
> per-user map is configured. What do you think?

Hm, per-user keymaps? I think this would be too complicated. We should
not care about user-ids in the driver. The application/user which is
allowed to open the event device in r/w mode, *may* load a new keymap.
This keymap will simply replace the existing one.

Basically it's just a replacement for the /proc/av7110_ir interface.
av7110_loadkeys can be re-written to use /dev/input/eventX ioctls.

If someone needs to load a keymap during startup, it can be done using
something like
  post-install dvb-ttpci av7110_loadkeys xyz.rc5 -o /dev/input/event0
in /etc/modules.conf. (Basically the same way as it can be done now.)

Improvements:
- Loadable keymap per device.
- Application with r/w access to /dev/input/eventX may replace keymap.

Additionally, I'd like to implement multiple keymaps per device.
A user might want to use different remote control units, which use the
same protocol but different device addresses. In this case we need 
a keymap per device address.

Oliver


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