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driver.9 (79538) driver.9 (79727)
1.\" -*- nroff -*-
2.\"
3.\" Copyright (c) 1998 Doug Rabson
4.\"
5.\" All rights reserved.
6.\"
7.\" This program is free software.
8.\"
9.\" Redistribution and use in source and binary forms, with or without
10.\" modification, are permitted provided that the following conditions
11.\" are met:
12.\" 1. Redistributions of source code must retain the above copyright
13.\" notice, this list of conditions and the following disclaimer.
14.\" 2. Redistributions in binary form must reproduce the above copyright
15.\" notice, this list of conditions and the following disclaimer in the
16.\" documentation and/or other materials provided with the distribution.
17.\"
18.\" THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY EXPRESS OR
19.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21.\" IN NO EVENT SHALL THE DEVELOPERS BE LIABLE FOR ANY DIRECT, INDIRECT,
22.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28.\"
1.\" -*- nroff -*-
2.\"
3.\" Copyright (c) 1998 Doug Rabson
4.\"
5.\" All rights reserved.
6.\"
7.\" This program is free software.
8.\"
9.\" Redistribution and use in source and binary forms, with or without
10.\" modification, are permitted provided that the following conditions
11.\" are met:
12.\" 1. Redistributions of source code must retain the above copyright
13.\" notice, this list of conditions and the following disclaimer.
14.\" 2. Redistributions in binary form must reproduce the above copyright
15.\" notice, this list of conditions and the following disclaimer in the
16.\" documentation and/or other materials provided with the distribution.
17.\"
18.\" THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY EXPRESS OR
19.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21.\" IN NO EVENT SHALL THE DEVELOPERS BE LIABLE FOR ANY DIRECT, INDIRECT,
22.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28.\"
29.\" $FreeBSD: head/share/man/man9/driver.9 79538 2001-07-10 15:31:11Z ru $
29.\" $FreeBSD: head/share/man/man9/driver.9 79727 2001-07-14 19:41:16Z schweikh $
30.\"
31.Dd June 16, 1998
32.Dt DRIVER 9
33.Os
34.Sh NAME
35.Nm driver
36.Nd structure describing a device driver
37.Sh SYNOPSIS
38.Bd -literal
39#include <sys/param.h>
40#include <sys/bus.h>
41
42static int foo_probe(device_t);
43static int foo_attach(device_t);
44static int foo_detach(device_t);
45static int foo_frob(device_t, int, int);
46static int foo_twiddle(device_t, char *);
47
48static struct device_method foo_methods[] = {
49 /* Methods from the device interface */
50 DEVMETHOD(device_probe, foo_probe),
51 DEVMETHOD(device_attach, foo_attach),
52 DEVMETHOD(device_detach, foo_detach),
53
54 /* Methods from the bogo interface */
55 DEVMETHOD(bogo_frob, foo_frob),
56 DEVMETHOD(bogo_twiddle, foo_twiddle),
57
58 /* Terminate method list */
59 { 0, 0 }
60};
61
62static driver_t foo_driver {
63 "foo",
64 foo_methods,
65 DRIVER_TYPE_MISC,
66 sizeof(struct foo_softc),
67};
68
69static devclass_t foo_devclass;
70
71DRIVER_MODULE(foo, bogo, foo_driver, foo_devclass, 0, 0);
72.Ed
73.Sh DESCRIPTION
74Each driver in the kernel is described by a
75.Dv driver_t
76structure. The structure contains the name of the device, a pointer
77to a list of methods, an indication of the kind of device which the
78driver implements and the size of the private data which the driver
30.\"
31.Dd June 16, 1998
32.Dt DRIVER 9
33.Os
34.Sh NAME
35.Nm driver
36.Nd structure describing a device driver
37.Sh SYNOPSIS
38.Bd -literal
39#include <sys/param.h>
40#include <sys/bus.h>
41
42static int foo_probe(device_t);
43static int foo_attach(device_t);
44static int foo_detach(device_t);
45static int foo_frob(device_t, int, int);
46static int foo_twiddle(device_t, char *);
47
48static struct device_method foo_methods[] = {
49 /* Methods from the device interface */
50 DEVMETHOD(device_probe, foo_probe),
51 DEVMETHOD(device_attach, foo_attach),
52 DEVMETHOD(device_detach, foo_detach),
53
54 /* Methods from the bogo interface */
55 DEVMETHOD(bogo_frob, foo_frob),
56 DEVMETHOD(bogo_twiddle, foo_twiddle),
57
58 /* Terminate method list */
59 { 0, 0 }
60};
61
62static driver_t foo_driver {
63 "foo",
64 foo_methods,
65 DRIVER_TYPE_MISC,
66 sizeof(struct foo_softc),
67};
68
69static devclass_t foo_devclass;
70
71DRIVER_MODULE(foo, bogo, foo_driver, foo_devclass, 0, 0);
72.Ed
73.Sh DESCRIPTION
74Each driver in the kernel is described by a
75.Dv driver_t
76structure. The structure contains the name of the device, a pointer
77to a list of methods, an indication of the kind of device which the
78driver implements and the size of the private data which the driver
79needs to associate with a device instance. Each driver will implement
79needs to associate with a device instance. Each driver will implement
80one or more sets of methods (called interfaces). The example driver
81implements the standard "driver" interface and the fictitious "bogo"
82interface.
83.Pp
84When a driver is registered with the system (by the
85.Dv DRIVER_MODULE
86macro, see
87.Xr DRIVER_MODULE 9 ) ,
88it is added to the list of drivers contained in the devclass
89of its parent bus type. For instance all PCI drivers would be
90contained in the devclass named "pci" and all ISA drivers would be
91in the devclass named "isa".
80one or more sets of methods (called interfaces). The example driver
81implements the standard "driver" interface and the fictitious "bogo"
82interface.
83.Pp
84When a driver is registered with the system (by the
85.Dv DRIVER_MODULE
86macro, see
87.Xr DRIVER_MODULE 9 ) ,
88it is added to the list of drivers contained in the devclass
89of its parent bus type. For instance all PCI drivers would be
90contained in the devclass named "pci" and all ISA drivers would be
91in the devclass named "isa".
92The reason the drivers are not held in the device object of the parent
92The reason the drivers are not held in the device object of the parent
93bus is to handle multiple instances of a given type of bus.
94The
95.Dv DRIVER_MODULE
96macro will also create the devclass with the name of the driver and
97can optionally call extra initialisation code in the driver by
98specifying an extra module event handler and argument as the last two
99arguments.
100.Sh SEE ALSO
101.Xr devclass 9 ,
102.Xr device 9 ,
103.Xr DEVICE_ATTACH 9 ,
104.Xr DEVICE_DETACH 9 ,
105.Xr DEVICE_IDENTIFY 9 ,
106.Xr DEVICE_PROBE 9 ,
107.Xr DEVICE_SHUTDOWN 9 ,
108.Xr DRIVER_MODULE 9
109.Sh AUTHORS
110This man page was written by
111.An Doug Rabson .
93bus is to handle multiple instances of a given type of bus.
94The
95.Dv DRIVER_MODULE
96macro will also create the devclass with the name of the driver and
97can optionally call extra initialisation code in the driver by
98specifying an extra module event handler and argument as the last two
99arguments.
100.Sh SEE ALSO
101.Xr devclass 9 ,
102.Xr device 9 ,
103.Xr DEVICE_ATTACH 9 ,
104.Xr DEVICE_DETACH 9 ,
105.Xr DEVICE_IDENTIFY 9 ,
106.Xr DEVICE_PROBE 9 ,
107.Xr DEVICE_SHUTDOWN 9 ,
108.Xr DRIVER_MODULE 9
109.Sh AUTHORS
110This man page was written by
111.An Doug Rabson .