[haiku-development] Re: Parallel port driver
- From: Philippe Houdoin <philippe.houdoin@xxxxxxxxx>
- To: haiku-development@xxxxxxxxxxxxx
- Date: Tue, 18 May 2010 12:52:08 +0200
Hi,
> Can you comment some more on how this driver can be
> used and whether it's complete or what is still missing?
After a quicklook, it seems complete *and* fully compatible with
R5 parallel ports driver API. The public parallel_driver.h header,
being identical to Be's one,
could needs some copyright care before being added to
headers/os/drivers folder, though.
> I assume applications open() the device and then use ioctl()?
> Or is there already some code in the API kits that can make use of this
> (i.e. does the ioctl() interface follow some established Haiku standard)?
Beside Parallel Port print transport add-on, nothing interface with
/dev/parallel/* devices yet.
For hotplug printer detection and model identification, the ioctl()
interface would be usefull, though, as it's not a feature supported by
this transport add-on (list_transport_ports() simply report every
parallel port supported, not the printers detected on it...), contrary
to the USB transport one, which does it in a nice way.
> Also I can't tell how severe the other items in the TODO are and
> whether they limit usability of the driver or not.
Except for ieee1284 full compliance maybe, I don't see stoppers.
> The code has some consistent violations of the coding style... :-) If others
> agree we could apply it as is nevertheless, since it's pretty much a closed
> component.
+1
Then I'll hunt down for my old parallel Canon BJ-220 ;-)
If anyone could point at some code detecting printer presence and
model over a parallel port, please share it on a new Trac ticket...
Bye,
Philippe.
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