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  * Copyright (c) 2005, Sam Leffler <sam@errno.com>
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice unmodified, this list of conditions, and the following
   10  *    disclaimer.
   11  * 2. Redistributions in binary form must reproduce the above copyright
   12  *    notice, this list of conditions and the following disclaimer in the
   13  *    documentation and/or other materials provided with the distribution.
   14  *
   15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   18  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   19  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   20  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   21  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   22  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   24  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   25  *
   26  * $FreeBSD: releng/10.0/sys/sys/firmware.h 166756 2007-02-15 17:21:31Z luigi $
   27  */
   28 #ifndef _SYS_FIRMWARE_H_
   29 #define _SYS_FIRMWARE_H_
   30 /*
   31  * Loadable firmware support.
   32  *
   33  * The firmware abstraction provides an interface for loading firmware
   34  * images into the kernel and making them available to clients.
   35  *
   36  * Firmware images are usually embedded in kernel loadable modules that can
   37  * be loaded on-demand or pre-loaded as desired.  Modules may contain
   38  * one or more firmware images that are stored as opaque data arrays
   39  * and registered with a unique string name. Clients request
   40  * firmware by name, and are returned a struct firmware * below on success.
   41  * The kernel keeps track of references to firmware images to allow/prevent
   42  * module/data unload.
   43  *
   44  * When multiple images are stored in one module, the first image is
   45  * treated as the master with the other images holding references
   46  * to it.  This means that to unload the module each dependent/subimage
   47  * must first have its references removed.
   48  * In order for automatic loading to work, the master image must have
   49  * the same name as the module it is embedded into.
   50  */
   51 struct firmware {
   52         const char      *name;          /* system-wide name */
   53         const void      *data;          /* location of image */
   54         size_t           datasize;      /* size of image in bytes */
   55         unsigned int     version;       /* version of the image */
   56 };
   57 
   58 const struct firmware   *firmware_register(const char *,
   59         const void *, size_t, unsigned int, const struct firmware *);
   60 int      firmware_unregister(const char *);
   61 const struct firmware *firmware_get(const char *);
   62 #define FIRMWARE_UNLOAD         0x0001  /* unload if unreferenced */
   63 void             firmware_put(const struct firmware *, int);
   64 #endif /* _SYS_FIRMWARE_H_ */

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