Nicolas Souchu (nsouch@teaser.fr)
Fri, 11 Dec 1998 23:13:45 +0000
On Wed, Dec 09, 1998 at 09:00:01PM +0000, Tim Waugh wrote:
>
>On Wed, 9 Dec 1998, Nicolas Souchu wrote:
>
>> >Tim has just implemented the IEEE 1284. For the IEEE 1284.3 things are a
>> >bit more difficult since we' ll need to change the core parport_share code
>> >(parport_claim() in particular).
>>
>> Couldn't the IEEE1284.3 standard be implemented as a regular driver? It
>> would just share the port with others, at least with drivers that
>> operate with the terminal peripheral of the daisy chain.
>
>I don't see how that would work. The plan is that when you register a
>device with parport, you tell it where it lives in the topology. Then,
>when you claim the device, parport selects the relevant device on your
>behalf.
This is particular to 1284.3.
Here is how ppbus will handle the 1284.3 issue (if ever implemented):
dev 1284.3 compliant device
--------
1284 dev | 1284.3 1284 device driver level
---------------------
dev | 1284 ppbus device driver level
--------------------------------
ppbus bus level
--------------------------------
ppc adapter level
Nicholas.
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