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DRIVER_MODULE.9freebsd

BSD mandoc

NAME

DRIVER_MODULE - kernel driver declaration macro

SYNOPSIS

In sys/param.h In sys/kernel.h In sys/bus.h In sys/module.h Fn DRIVER_MODULE name busname driver_t driver devclass_t devclass modeventhand_t evh void *arg Fn MULTI_DRIVER_MODULE name busname driver_t drivers[] devclass_t devclass modeventhand_t evh void *arg

DESCRIPTION

The Fn DRIVER_MODULE macro declares a kernel driver. Fn DRIVER_MODULE expands to the real driver declaration, where the phrase Fa name is used as the naming prefix for the driver and its functions. Note that it is supplied as plain text, and not a char or char *

Fa busname is the parent bus of the driver (PCI, ISA, PPBUS and others), e.g. `pci' , `isa' , or `ppbus'

The identifier used in Fn DRIVER_MODULE can be different from the driver name. Also, the same driver identifier can exist on different busses, which is a pretty clean way of making front ends for different cards using the same driver on the same or different busses. For example, the following is allowed:

Fn DRIVER_MODULE foo isa foo_driver foo_devclass NULL NULL ;

Fn DRIVER_MODULE foo pci foo_driver foo_devclass NULL NULL ;

Fa driver is the driver of type driver_t which contains the information about the driver and is therefore one of the two most important parts of the call to Fn DRIVER_MODULE .

The Fa devclass argument contains the kernel-internal information about the device, which will be used within the kernel driver module.

The Fa evh argument is the event handler which is called when the driver (or module) is loaded or unloaded (see module(9)).

The Fa arg is unused at this time and should be a NULL pointer.

Fn MULTI_DRIVER_MODULE is a special version of Fn DRIVER_MODULE , which takes a list of drivers instead of a single driver instance.

SEE ALSO

device(9), driver(9), module(9)

AUTHORS

This manual page was written by An Alexander Langer Aq alex@FreeBSD.org .