xref: /illumos-gate/usr/src/man/man9f/firmload.9f (revision bbf21555)

.\"	$NetBSD: firmload.9,v 1.8 2014/03/18 18:20:40 riastradh Exp $
.\"
.\" Copyright 2016 Hans Rosenfeld <rosenfeld@grumpf.hope-2000.org>
.\"
.\" Copyright (c) 2006 The NetBSD Foundation, Inc.
.\" All rights reserved.
.\"
.\" This code is derived from software contributed to The NetBSD Foundation
.\" by Jason R. Thorpe.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\"    notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\"    notice, this list of conditions and the following disclaimer in the
.\"    documentation and/or other materials provided with the distribution.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
.\" PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
.\" POSSIBILITY OF SUCH DAMAGE.
.\"
.Dd January 22, 2016
.Dt FIRMLOAD 9F
.Os
.Sh NAME
.Nm firmload
.Nd Firmware loader API for device drivers
.Sh SYNOPSIS
.In sys/firmload.h
.Ft int
.Fo "firmware_open"
.Fa "const char *drvname"
.Fa "const char *imgname"
.Fa "firmware_handle_t *fhp"
.Fc
.Ft int
.Fo "firmware_close"
.Fa "firmware_handle_t fh"
.Fc
.Ft off_t
.Fo "firmware_get_size"
.Fa "firmware_handle_t fh"
.Fc
.Ft int
.Fo "firmware_read"
.Fa "firmware_handle_t fh"
.Fa "off_t offset"
.Fa "void *buf"
.Fa "size_t size"
.Fc
.Sh PARAMETERS
.Bl -tag -width Va
.It Fa drvname
The name of the driver using
.Nm .
This is used as the subdirectory holding the firmware images.
.It Fa imgname
The file name of a firmware image.
.It Fa fhp
The pointer used for returing a firmware handle.
.It Fa fh
The firmware handle.
.It Fa offset
The offset in the firmware image to start reading from.
.It Fa buf
Pointer to a buffer to hold the firmware data.
.It Fa size
Size of the buffer to hold the firmware data.
.El
.Sh DESCRIPTION
.Nm
provides a simple and convenient API for device drivers to load firmware
images from files residing in the file system that are necessary for the
devices that they control.
It is primarily intended for devices without non-volatile firmware
memory, which usually require the driver to load a firmware image at
attach time.
Firmware images reside in sub-directories, one for each driver, in the
namespace "firmware" in the system default module search path as
described in
.Xr system 5 .
.sp
The following functions are provided by the
.Nm
API:
.Bl -tag -width indent
.It Fn "firmware_open"
Open the firmware image
.Fa imgname
for the driver
.Fa drvname .
The path to the firmware image file is constructed by appending the string
.Dq "firmware/drvname/imgname"
to each system module path prefix until opening the firmware image
file succeeds.
.It Fn "firmware_close"
Close the firmware image file associated with the firmware handle
.Fa fh .
.It Fn "firmware_get_size"
Returns the size of the image file associated with the firmware handle
.Fa fh .
.It Fn "firmware_read"
Reads from the image file associated with the firmware handle
.Fa fh
beginning at offset
.Fa offset
for length
.Fa size .
The firmware image data is placed into the buffer specified by
.Fa buf .
.Fn "firmware_read"
will either read as much data as requested or fail, there are no short
reads.
.El
.Sh CONTEXT
These functions can be called from user and kernel context.
.Sh RETURN VALUES
Upon successful completion, the
.Fn firmware_open
function returns zero and stores a firmware handle in
.Fa fhp .
Otherwise a non-zero error code is returned.
.sp
The function
.Fn firmware_read
will return zero on success and
.Fa buf
will be filled with
.Fa size
bytes of data.
On failure -1 is returned.
.sp
The function
.Fn firmware_get_size
returns the size of a firmware image.
.sp
.Fn firmware_close
will always return zero.
.Sh INTERFACE STABILITY
.Sy Committed
.Sh SEE ALSO
.Xr system 5