freebsd-nq/share/man/man9/BUS_GET_PROPERTY.9
Bartlomiej Grzesik 3f9a00e3b5 device: add device_get_property and device_has_property
Generialize bus specific property accessors. Those functions allow driver code
to access device specific information.

Currently there is only support for FDT and ACPI buses.

Reviewed by: manu, mw
Sponsored by: Semihalf
Differential revision: https://reviews.freebsd.org/D31597
2021-09-20 17:17:57 +02:00

66 lines
2.2 KiB
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.Dd August 19, 2021
.Dt BUS_GET_PROPERTY 9
.Os
.Sh NAME
.Nm BUS_GET_PROPERTY
.Nd get child's specific property
.Sh SYNOPSIS
.In sys/param.h
.In sys/bus.h
.Ft ssize_t
.Fn BUS_GET_PROPERTY "device_t dev" "device_t child" "const char *propname" \
"void *propvalue" "size_t size"
.Sh DESCRIPTION
The
.Fn BUS_GET_PROPERTY
method
is called from driver code which wants to access child's specific data stored
on the bus.
Property consits of its name and value.
Implementation shall copy to
.Fa propvalue
at most
.Fa size
bytes.
.Sh NOTES
If
.Fa propvalue
is NULL or
.Fa size
is zero, then implementation shall only return size of the property.
.Sh RETURN VALUES
Property's size if successful, otherwise -1.
.Sh SEE ALSO
.Xr device 9 ,
.Xr device_get_property 9
.Sh AUTHORS
This manual page was written by
.An Bartlomiej Grzesik .