Re: staging: media: lirc: lirc_zilog.c: replace custom print macros with dev_* and pr_*

Sean Young
2014-11-09T21:35:22Z

On Thu, Nov 06, 2014 at 08:56:47AM -0500, Andy Walls wrote:
> On November 6, 2014 8:54:28 AM EST, Andy Walls <awalls.cx18@gmail.com> wrote:
> >Sean,
> >
> >Ir-kbd-i2c was never intended for Tx.
> >
> >You can transmit *short* arbitrary pulse-space streams with the zilog
> >chip, by feeding it a parameter block that has the pulse timing
> >information and then subsequently has been obfuscated. The firmware
> >file that LIRC uses in userspace is full of predefined versions of
> >these things for RC5 and NEC IIRC. This LIRC firmware file also holds
> >the (de)obfuscation key.
> >
> >I've got a bunch of old notes on this stuff from essentially reverse
> >engineering the firmware in the Z8. IANAL, but to me, its use in
> >developing in-kernel stuff could be dubious.
> >
> >Regards,
> >Andy

Very interesting.

I had considered reverse engineering the z8 firmware but I never found a
way to access it. I guess we have three options:

1. I could use Andy's notes to implement Tx. I have not seen the original
firmware code so I'm not contaminated by reverse engineering it. IANAL
but I thought this is an acceptable way of writing a driver.

2. Hauppauge could prove us with documentation to write a driver with.

3. Leave it as-is, lirc_zilog will eventually be deleted from staging as it
can't be ported to rc-core.

Sean