xref: /dflybsd-src/share/man/man9/sensor_attach.9 (revision b8dea66a359a9b3f839e1bf9efe69be30d8395ed)

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.\" Copyright (c) 2006 Michael Knudsen <mk@openbsd.org>
.\" Copyright (c) 2006 Constantine A. Murenin <cnst+openbsd@bugmail.mojo.ru>
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.Dd August 19, 2007
.Dt SENSOR_ATTACH 9
.Os
.Sh NAME
.Nm sensor_attach ,
.Nm sensor_detach ,
.Nm sensordev_install ,
.Nm sensordev_deinstall ,
.Nm sensor_task_register ,
.Nm sensor_task_unregister
.Nd sensors framework
.Sh SYNOPSIS
.In sys/sensors.h
.Ft void
.Fn "sensordev_install" "struct ksensordev *sensdev"
.Ft void
.Fn "sensordev_deinstall" "struct ksensordev *sensdev"
.Pp
.Ft void
.Fn "sensor_attach" "struct ksensordev *sensdev" "struct ksensor *sens"
.Ft void
.Fn "sensor_detach" "struct ksensordev *sensdev" "struct ksensor *sens"
.Pp
.Ft int
.Fn "sensor_task_register" "void *arg" "void (*func)(void *)" "int period"
.Ft void
.Fn "sensor_task_unregister" "void *arg"
.Sh DESCRIPTION
The
sensors
framework API provides a mechanism for manipulation of hardware sensors
that are available under the
.Va hw.sensors
.Xr sysctl 8
tree.
.Pp
.Fn sensor_attach
adds the sensor specified by the
.Pa sens
argument to the sensor device specified by the
.Pa sensdev
argument.
.Fn sensor_detach
can be used to remove sensors previously added by
.Fn sensor_attach .
.Pp
.Fn sensordev_install
registers the sensor device specified by the
.Pa sensdev
argument so that all sensors that are attached to the device become
accessible via the sysctl interface.
.Fn sensordev_deinstall
can be used to remove sensor devices previously registered by
.Fn sensordev_install .
.Pp
Drivers are responsible for retrieving, interpreting and normalising
sensor values and updating the sensor struct periodically.
If the driver needs process context, for example to sleep, it can
register a task with the sensor framework.
.Pp
.Fn sensor_task_register
is used to register a periodic task to update sensors.
The
.Fa func
argument is a pointer to the function to run with an interval of
.Fa period
seconds.
The
.Fa arg
parameter is the argument given to the
.Fa func
function.
The
.Fn sensor_task_unregister
removes all tasks previously registered with
.Fn sensor_task_register
with an argument of
.Fa arg .
.Sh COMPATIBILITY
.Ss sensor_task
The
.Fn sensor_task_register
and
.Fn sensor_task_unregister
functions that are included in
.Ox 4.2
and later
are not compatible with
.Fx .
.Fx
includes an implementation that is similar and compatible
with an earlier version of
these
.Va sensor_task
functions that was available from
.Ox 3.9
until
.Ox 4.1 .
.Pp
Drivers that only call
.Fn sensor_task_register
and don't check its return value are not affected by this
.Va sensor_task
compatibility notice.
.Sh SEE ALSO
.Xr systat 1 ,
.Xr sysctl 3 ,
.Xr sensorsd 8 ,
.Xr sysctl 8
.Sh HISTORY
The sensor framework was written by
.An Alexander Yurchenko Aq grange@openbsd.org
and first appeared in
.Ox 3.4 .
.An David Gwynne Aq dlg@openbsd.org
later extended it for
.Ox 3.8 .
.An Constantine A. Murenin Aq cnst+openbsd@bugmail.mojo.ru
extended it even further by introducing the concept of sensor devices in
.Ox 4.1 .
.Pp
The framework was ported to
.Fx
by
.An Constantine A. Murenin
as a Google Summer of Code 2007 project.