Re: [RTnet-developers] RTDM devices class and subclass

[Jan K. <jan...@we...>]

Marcelo Coelho wrote:
> Hi Jan,
>=20

Hmm, I wonder what made this message pop up on rtnet-devel. Nevermind. :)=


>=20
> I've continuing the development of the serial device driver port to
> Real-Time. I've seen both Rtai_serial driver and the rtdm api and now i=

> think i'm starting to make some progress... :)
>=20
> Now i stumbled on detail that isn't referred on the RTDM api
> specification: There are some macros defining the Class and Subclass of=

> a RTDM driver. These regulations are defined by the rtdm team, right?=20

Yes, that's a rather loooong process. It involves issuing a formal
request for the number, a first review and rejection, a submission of a
revised request, a public hearing, several meetings of the steering
committee (at the expense of the requester, of course!), and then,
maybe, the granting.

> As i'm developing a serial device, my class and subclass should be
> RTDM_CLASS_SERIAL and RTDM_SUBCLASS_MOXA (for a Moxa RS-422 driver).
>=20

Ok, I take this question as step 1 and continue with step 2: The Moxa is
a specific chip with different features than a normal 16550A-compatible
UART? Will you implement less / more IOCTLs for this driver or some
other service differently? My point is that defining a subclass is only
required when the programming model differs.

Jan


PS: Submitting your driver for inclusion in RTAI and/or Xenomai may help
to accelerate the subclass reservation. ;)