Date: Thu, 24 Apr 2003 01:39:53 -0400 From: Mathew Kanner <mat@cnd.mcgill.ca> To: freebsd-current@freebsd.org Subject: pseudo bus, fake devices, midi problems Message-ID: <20030424053953.GF23335@cnd.mcgill.ca>
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Hello All, I'm playing with Midi and have reached an impasse, someone please advise before I waste a lot of time. Premise (part 1): Midi isn't really part of the PCM and it should be and I've almost got it there, when done, drivers that implement midi won't have to be re-factored into a bridge driver and pcm/midi sub-drivers but will much more like a mixer, where you just define a kobj that implement the needed parts. Premise (part 2): Timidity (a userland midi sound renderer, akin to modtrackers from back in the day) can can do level 0 rendering or level 2 rendering (the difference is level 0, timing is done in the kernel). Problem: PCM requires that drivers be real devices and uses the index (uh, unit number), so I need a fake bus, to hold a fake driver so I can get a unit number. I'm in the process of creating a pseudo bus that will be off the root_bus, it re-implements all bus-methods to do almost nothing and will auto-create all drivers upon driver registration. Questions: How wrong is a pseudo bus? / How fake can a driver be? Is there another way to wedge a fake device into pcm? An unrelated question, how does one augment MFILES? Seems like I have to redefine with all the possible .m files around instead of just supplementing with the new .m files my module. Thanks, --Mat -- "There are only 10 types of people in this world: those who understand binary and those who don't." -- from 0xdeadbeef
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