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    1: .\" Copyright (c) 2000 Alexander Langer
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   30: .Dd May 16, 2000
   31: .Dt DRIVER_MODULE 9
   32: .Os
   33: .Sh NAME
   34: .Nm DRIVER_MODULE
   35: .Nd kernel driver declaration macro
   36: .Sh SYNOPSIS
   37: .In sys/types.h
   38: .In sys/bus.h
   39: .In sys/module.h
   40: .Fn DRIVER_MODULE name busname "driver_t driver" "devclass_t devclass" "modeventhand_t evh" "void *arg"
   41: .Fn MULTI_DRIVER_MODULE name busname "driver_t drivers[]" "devclass_t devclass" "modeventhand_t evh" "void *arg"
   42: .Sh DESCRIPTION
   43: The
   44: .Fn DRIVER_MODULE
   45: macro declares a kernel driver.
   46: .Fn DRIVER_MODULE
   47: expands to the real driver declaration, where the phrase
   48: .Fa name
   49: is used as the naming prefix for the driver and its functions.
   50: Note that it is supplied as plain text, and not a
   51: .Li char
   52: or
   53: .Li char * .
   54: .Pp
   55: .Fa busname
   56: is the parent bus of the driver (PCI, ISA, PPBUS and others), e.g.\&
   57: .Ql pci ,
   58: .Ql isa ,
   59: or
   60: .Ql ppbus .
   61: .Pp
   62: The identifier used in
   63: .Fn DRIVER_MODULE
   64: can be different from the driver name.
   65: Also, the same driver identifier can exist on different busses,
   66: which is a pretty clean way of making front ends for different cards
   67: using the same driver on the same or different busses.
   68: For example, the following is allowed:
   69: .Pp
   70: .Fn DRIVER_MODULE foo isa foo_driver foo_devclass NULL NULL ;
   71: .Pp
   72: .Fn DRIVER_MODULE foo pci foo_driver foo_devclass NULL NULL ;
   73: .Pp
   74: .Fa driver
   75: is the driver of type
   76: .Li driver_t ,
   77: which contains the information about the driver and is therefore one of the
   78: two most important parts of the call to
   79: .Fn DRIVER_MODULE .
   80: .Pp
   81: The
   82: .Fa devclass
   83: argument contains the kernel-internal information about the device,
   84: which will be used within the kernel driver module.
   85: .Pp
   86: The
   87: .Fa evh
   88: argument is the event handler which is called when the driver (or module)
   89: is loaded or unloaded (see
   90: .Xr module 9 ) .
   91: .Pp
   92: The
   93: .Fa arg
   94: is unused at this time and should be a
   95: .Dv NULL
   96: pointer.
   97: .Pp
   98: .Fn MULTI_DRIVER_MODULE
   99: is a special version of
  100: .Fn DRIVER_MODULE ,
  101: which takes a list of drivers instead of a single driver instance.
  102: .Sh SEE ALSO
  103: .Xr device 9 ,
  104: .Xr driver 9 ,
  105: .Xr module 9
  106: .Sh AUTHORS
  107: This manual page was written by
  108: .An Alexander Langer Aq alex@FreeBSD.org .