The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/sys/firmware.h

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2005, Sam Leffler <sam@errno.com>
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice unmodified, this list of conditions, and the following
   12  *    disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   18  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   19  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   20  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   21  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   22  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   27  *
   28  * $FreeBSD: releng/12.0/sys/sys/firmware.h 326256 2017-11-27 15:01:59Z pfg $
   29  */
   30 #ifndef _SYS_FIRMWARE_H_
   31 #define _SYS_FIRMWARE_H_
   32 /*
   33  * Loadable firmware support.
   34  *
   35  * The firmware abstraction provides an interface for loading firmware
   36  * images into the kernel and making them available to clients.
   37  *
   38  * Firmware images are usually embedded in kernel loadable modules that can
   39  * be loaded on-demand or pre-loaded as desired.  Modules may contain
   40  * one or more firmware images that are stored as opaque data arrays
   41  * and registered with a unique string name. Clients request
   42  * firmware by name, and are returned a struct firmware * below on success.
   43  * The kernel keeps track of references to firmware images to allow/prevent
   44  * module/data unload.
   45  *
   46  * When multiple images are stored in one module, the first image is
   47  * treated as the master with the other images holding references
   48  * to it.  This means that to unload the module each dependent/subimage
   49  * must first have its references removed.
   50  * In order for automatic loading to work, the master image must have
   51  * the same name as the module it is embedded into.
   52  */
   53 struct firmware {
   54         const char      *name;          /* system-wide name */
   55         const void      *data;          /* location of image */
   56         size_t           datasize;      /* size of image in bytes */
   57         unsigned int     version;       /* version of the image */
   58 };
   59 
   60 const struct firmware   *firmware_register(const char *,
   61         const void *, size_t, unsigned int, const struct firmware *);
   62 int      firmware_unregister(const char *);
   63 const struct firmware *firmware_get(const char *);
   64 #define FIRMWARE_UNLOAD         0x0001  /* unload if unreferenced */
   65 void             firmware_put(const struct firmware *, int);
   66 #endif /* _SYS_FIRMWARE_H_ */

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