Re: [R-engine-developers] New comer to r-engine

[Peter M. <pe...@mc...>]

On Sat, 2005-08-13 at 13:20 +0200, Cedric Cellier wrote:
...
> So, just to be sure I understand what we have : The camera send its flow 
> to a Phillips SAA7114 wich then send it to the Fujitsu mb86393, both 
> circuit beeing given the name 'r-engine' by sony. The mb86393 is a PCI 
> device and the code a driver of another engine ('Triumph' driver) was 
> given by Fujitsu (considering japanese comments and documentation). The 
> mb86393 and the saa7114 communicates via i2c. In the driver given by 
> Fujitsu, the mb86393 was used with the SAA7113 instead, wich is a 
> similar but simplier chip. We do not care because we know everything 
> about the saa7114 thanx to previous work in media/video.
> 
> Am I right ?

Pretty much, the i2c is driven via the gpio on the mb86393.

> 
> If so, can I ask you a question : how do we know for the saa7114 ? The 
> information comes from sony/fujitsu, or is it just a guess based on chip 
> recognition ? I ask because I tried to read some of its registers 
> without success.

No guess. I opened up my viao and had a look ;-)

> 
> Then, if it turns out to be a sa7114, why not reusing fully the sa7114.c 
> by coding the mb86393 driver as a pci_device *AND* as a i2c_adapter ? 
> Maybe I'm just too unfamiliar with the linux internal designs...

Yep that would work, only point there would be having to write an i2c
driver for the 86393. The thing we don't know is which GPIO bits are
used for what signals on the circuit since they're "programmable".

That may take some sniffing the control signals under the windows
driver. Unfortunately I can't get windows reloaded on my viao at the
moment as I don't have a Sony cdrom drive.

Cheers,
Peter.

> 
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Peter McNeil
http://www.mcneils.net