traditional syscalls with DRIVER_MODULE ????

[Jim Bryant]

i'm in the process of both learning the driver interface and writing a 
usb driver for a multimedia product.

i'm kind of stuck here, as i'm seeing two distinct, and possibly 
mutually exclusive interfaces here.

the test framework i'm currently using is the DRIVER_MODULE macro, but 
it lacks the traditional syscalls provided by cdevsw (in particular, i'm 
wanting open, close, poll, read, and write).

if i add such an interface to the current DRIVER_MODULE version, how 
would i go about *NOT* having DRIVER_MODULE create the devfs entries?  i 
would prefer to have the devfs entries handled by make_dev, so to have 
access to the desired syscalls.

the only thing in the usb framework using the cdevsw framework seems to 
be usb_dev.c, but it seems to be an abstraction, and not an end-device 
in the sense that i'm doing.

any tips?  any pointers?  i've done a grep, and found that there is no 
existing driver that uses DRIVER_MODULE with any *_read, *_write, or 
*_close.

i can do the job with ioctls, but doing so would rule out select in 
userland code, and for the interrupt endpoints, i would rather have a 
poll and read interface that allows for select(2) and read(2).

also, i would like to thank hans selasky for the pointer to his 
meetbsd/krakow presentation on the usb stack, i did learn a couple of 
new things about capabilities from it, but it lacked the detail i'm 
looking for.

jim