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diff --git a/share/man/man9/driver.9 b/share/man/man9/driver.9 new file mode 100644 index 0000000..93ab992 --- /dev/null +++ b/share/man/man9/driver.9 @@ -0,0 +1,116 @@ +.\" -*- nroff -*- +.\" +.\" Copyright (c) 1998 Doug Rabson +.\" +.\" All rights reserved. +.\" +.\" This program is free software. +.\" +.\" Redistribution and use in source and binary forms, with or without +.\" modification, are permitted provided that the following conditions +.\" are met: +.\" 1. Redistributions of source code must retain the above copyright +.\" notice, this list of conditions and the following disclaimer. +.\" 2. Redistributions in binary form must reproduce the above copyright +.\" notice, this list of conditions and the following disclaimer in the +.\" documentation and/or other materials provided with the distribution. +.\" +.\" THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY EXPRESS OR +.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES +.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. +.\" IN NO EVENT SHALL THE DEVELOPERS BE LIABLE FOR ANY DIRECT, INDIRECT, +.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT +.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, +.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY +.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF +.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. +.\" +.\" $FreeBSD$ +.\" +.Dd November 22, 2011 +.Dt DRIVER 9 +.Os +.Sh NAME +.Nm driver +.Nd structure describing a device driver +.Sh SYNOPSIS +.Bd -literal +#include <sys/param.h> +#include <sys/kernel.h> +#include <sys/bus.h> +#include <sys/module.h> + +static int foo_probe(device_t); +static int foo_attach(device_t); +static int foo_detach(device_t); +static int foo_frob(device_t, int, int); +static int foo_twiddle(device_t, char *); + +static device_method_t foo_methods[] = { + /* Methods from the device interface */ + DEVMETHOD(device_probe, foo_probe), + DEVMETHOD(device_attach, foo_attach), + DEVMETHOD(device_detach, foo_detach), + + /* Methods from the bogo interface */ + DEVMETHOD(bogo_frob, foo_frob), + DEVMETHOD(bogo_twiddle, foo_twiddle), + + /* Terminate method list */ + DEVMETHOD_END +}; + +static driver_t foo_driver = { + "foo", + foo_methods, + sizeof(struct foo_softc) +}; + +static devclass_t foo_devclass; + +DRIVER_MODULE(foo, bogo, foo_driver, foo_devclass, NULL, NULL); +.Ed +.Sh DESCRIPTION +Each driver in the kernel is described by a +.Dv driver_t +structure. +The structure contains the name of the device, a pointer +to a list of methods, an indication of the kind of device which the +driver implements and the size of the private data which the driver +needs to associate with a device instance. +Each driver will implement +one or more sets of methods (called interfaces). +The example driver +implements the standard "driver" interface and the fictitious "bogo" +interface. +.Pp +When a driver is registered with the system (by the +.Dv DRIVER_MODULE +macro, see +.Xr DRIVER_MODULE 9 ) , +it is added to the list of drivers contained in the devclass +of its parent bus type. +For instance all PCI drivers would be +contained in the devclass named "pci" and all ISA drivers would be +in the devclass named "isa". +The reason the drivers are not held in the device object of the parent +bus is to handle multiple instances of a given type of bus. +The +.Dv DRIVER_MODULE +macro will also create the devclass with the name of the driver and +can optionally call extra initialisation code in the driver by +specifying an extra module event handler and argument as the last two +arguments. +.Sh SEE ALSO +.Xr devclass 9 , +.Xr device 9 , +.Xr DEVICE_ATTACH 9 , +.Xr DEVICE_DETACH 9 , +.Xr DEVICE_IDENTIFY 9 , +.Xr DEVICE_PROBE 9 , +.Xr DEVICE_SHUTDOWN 9 , +.Xr DRIVER_MODULE 9 +.Sh AUTHORS +This manual page was written by +.An Doug Rabson . |
