schreite@helena.physik.uni-stuttgart.de
Wed, 10 Jun 98 10:21:49 +0200
Hi,
I've made a little patch concerning IEEE1284 negotiation things and
sent them tom Tim.
This patch contains two things:
- While probing an IEEE1284 device: stores the well known command sets,
the device reports, in a bit field (parport->device_info.well_known_cmdsets),
as discussed in the parport mailing list some weeks ago.
- in parport_ieee1284.c: A function, parport_ieee1284_negotiate,
very similar to parport_ieee1284_nibble_mode_ok, but slightly modified:
* It provides 3 states to return: + device not IEEE1284 compliant
+ device IEEE1284 compliant and mode
available
+ device IEEE1284 compliant, but mode
not available (new)
* Some signal bits are slightly changed, since the existing
parport_ieee1284_nibble_mode_ok doesn't work with the HP OfficeJets,
allthough they are specified to be IEEE1284 compliant devices. I have no
original IEEE1284 specs, but I use the docs from Warp Nine Engeneering -
The IEEE1284 Experts, and I think to strictly follow them.
For not to disturb any other hardware, parport_probe uses
the new parport_ieee1284_negotiate instead of
parport_ieee1284_nibble_mode_ok only, if it was compiled with the
command line argument -DHPOJ.
Hm, should I include this option into the kernel configuration scripts?
Hm, will parport_ieee1284_negotiate perhaps work with e v e r y
IEEE1284 device, so it can fully replace parport_ieee1284_nibble_mode_ok?
Roger.
==================================================================
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`
end
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This archive was generated by hypermail 2.0b3 on Wed 30 Dec 1998 - 10:17:49 EST