[E3-hacking] External keyboard (mailboard) support for 2.6

[Matt Callow]

Cliff Lawson wrote:
> It took us about a YEAR(!) to get the bloody keyboard working reliably so
> you're on the early stage of your journey. 
Great! :-) 
It seems wise to follow the FIQ route then, since you've probably 
already explored all other options. I will try to get the FIQ handler 
working with the 2.6 kernel.
Hopefully having a working 2.4 version will hopefully bring the 
development time down to less that a year!
> www.ourcottage.plus.com/ams_keyb_mod.c (from kernel/drivers/char)
>
> I'm not sure what dependent .h you might need so holler when it won't build!
>   
Thanks for that. Probably not going to try to compile it, as the matrix 
keyboard is already handled in the omap code, and I'm planing to write a 
driver that will fit in with the serio framework in the 2.6 kernel. But 
it's still useful to have. Whilst looking at the code, I noticed that 
the qwe interrupt handler writes to latch2 AMS_DELTA_HDW_OP_SCARD_2_MASK 
(I'm assuming AMS_DELTA_HDW_OP_SCARD_2_MASK is 0x400), setting it at the 
start and clearing it at the end. Is this for debug purposes only? I 
noticed a similar thing in the FIQ handler using GPIO6.

I also notice that the driver has some code for writing to the keyboard, 
but data never seems to be sent. Is my understanding correct? Does the 
keyboard accept data?


Matt