xref: /freebsd/share/man/man9/BUS_GET_PROPERTY.9 (revision 1323ec571215a77ddd21294f0871979d5ad6b992)
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26.\" $FreeBSD$
27.\"
28.Dd February 18, 2022
29.Dt BUS_GET_PROPERTY 9
30.Os
31.Sh NAME
32.Nm BUS_GET_PROPERTY
33.Nd get child's specific property
34.Sh SYNOPSIS
35.In sys/param.h
36.In sys/bus.h
37.Ft ssize_t
38.Fn BUS_GET_PROPERTY "device_t dev" "device_t child" "const char *propname" \
39    "void *propvalue" "size_t size" "device_property_type_t type"
40.Sh DESCRIPTION
41The
42.Fn BUS_GET_PROPERTY
43method
44is called from driver code which wants to access a child's specific data stored
45on the bus.
46A property has a name and an associated value.
47Implementation shall copy to
48.Fa propvalue
49at most
50.Fa size
51bytes.
52.Pp
53.Fn BUS_GET_PROPERTY
54supports different property types specified via the
55.Fa type
56argument.
57The
58.Fa size
59is guaranteed to be a multiple of the underlying property type.
60If a type is not supported,
61.Fn BUS_GET_PROPERTY
62shall return -1.
63.Sh NOTES
64If
65.Fa propvalue
66is NULL or
67.Fa size
68is zero, the implementation shall return only the size of the property.
69.Sh RETURN VALUES
70The property size if successful, otherwise -1.
71.Sh SEE ALSO
72.Xr device 9 ,
73.Xr device_get_property 9
74.Sh AUTHORS
75This manual page was written by
76.An Bartlomiej Grzesik .
77