101 lines
3.3 KiB
Groff
101 lines
3.3 KiB
Groff
.\" $NetBSD: radio.9,v 1.4 2005/12/20 19:53:15 rpaulo Exp $
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.\" $OpenBSD: radio.9,v 1.2 2001/10/08 08:52:50 mpech Exp $
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.\"
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.\" Copyright (c) Maxim Tsyplakov <tm@oganer.net>
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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.\" BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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.\" USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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.\" ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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.\"
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.Dd December 20, 2005
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.Dt RADIO 9
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.Os
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.Sh NAME
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.Nm radio
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.Nd interface between low and high level radio drivers
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.Sh DESCRIPTION
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The radio device driver is divided into a high level,
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hardware independent layer, and a low level hardware
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dependent layer.
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The interface between these is the
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.Va radio_hw_if
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structure.
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.Bd -literal
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struct radio_hw_if {
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int (*open)(void *, int, int, struct lwp *);
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int (*close)(void *, int, int, struct lwp *);
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int (*get_info)(void *, struct radio_info *);
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int (*set_info)(void *, struct radio_info *);
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int (*search)(void *, int);
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};
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.Ed
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.Pp
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The high level radio driver attaches to the low level driver
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when the latter calls
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.Va radio_attach_mi .
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This call should be
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.Bd -literal
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void
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radio_attach_mi(rhwp, hdlp, dev)
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struct radio_hw_if *rhwp;
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void *hdlp;
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struct device *dev;
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.Ed
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.Pp
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The
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.Va radio_hw_if
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struct is as shown above.
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The
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.Va hdlp
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argument is a handle to some low level data structure.
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It is sent as the first argument to all the functions in
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.Va radio_hw_if
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when the high level driver calls them.
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.Va dev
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is the device struct for the hardware device.
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.Pp
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The fields of
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.Va radio_hw_if
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are described in some more detail below.
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.Bd -literal
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int open (void *, int flags, int fmt, struct lwp *p);
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Optional.
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Is called when the radio device is opened.
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Returns 0 on success, otherwise an error code.
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int close (void *, int flags, int fmt, struct lwp *p);
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Optional.
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Is called when the radio device is closed.
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Returns 0 on success, otherwise an error code.
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int get_info (void *, struct radio_info *);
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Fill the radio_info struct.
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Returns 0 on success, otherwise an error code.
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int set_info (void *, struct radio_info *);
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Set values from the radio_info struct.
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Returns 0 on success, otherwise an error code.
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int search (void *, int);
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Returns 0 on success, otherwise an error code.
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.Ed
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.Sh SEE ALSO
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.Xr radio 4
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