Re: HowTo write a driver for 2 multiplexed PS/2 ports over 1 UART?

[Heiko Schocher <hs@denx.de>]

Hello Dmitry,

Dmitry Torokhov wrote:
> On Sunday 19 April 2009 03:04:25 Heiko Schocher wrote:
>> Hello Dmitry,
>>
>> Dmitry Torokhov wrote:
>>> You need to create 2 serio ports in your driver and have it send data
>>> into appropriate port, depending on what device it came from. If you
>>> take a look at i8042 driver it does exactly that. We have 1 serio port
>>> for keyboard and eithe 1 or 4 AUX serio ports. In i8042_interrupt we
>>> check the status bit to figure to which serio port incoming byte should
>>> be routed and act accordingly.
>> Ah, thanks for this hint :-)
>>
>> OK, so I have to write a serial driver for the uart on my hardware,
>> and add this in drivers/serio, right?
>>
>> Hmm.. spontaneous I think (maybe it is a bad thought), what do you
>> think to the following approach:
>>
>> I didn;t want to write a new serio driver for my uart (mpc5200 internal
>> PSC Uart), because there is a working tty driver for this, and the multi-
>> plexing functionality is just a protocoll ... so I think of using
>> the drivers/serio/serport.c and add this "multiplexing" functionality
>> to the serport.c driver ... is this worth about to think?
>>
>> this should be a more general approach then writting a special serial
>> driver for "my" UART ... what do you think?
>>
> 
> Yes, this is definitely better solution. I did not realize that there
> was a working driver for your UART. It would be best if your solution
> extended (and was compatible with) current N_MOUSE line discipline.

OK, thanks for your info, I hope I get this project, so I can do this
job.

bye
Heiko
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