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/* $NetBSD: firmload.c,v 1.19 2014/03/25 16:19:13 christos Exp $ */
/*
* Copyright 2016 Hans Rosenfeld <rosenfeld@grumpf.hope-2000.org>
*/
/*
* Copyright (c) 2005, 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.
*/
/*
* The firmload API provides an interface for device drivers to access
* firmware images that must be loaded onto their devices.
*/
#include <sys/param.h>
#include <sys/fcntl.h>
#include <sys/systm.h>
#include <sys/vnode.h>
#include <sys/lwp.h>
#include <sys/file.h>
#include <sys/cmn_err.h>
#include <sys/modctl.h>
#include <sys/kobj.h>
#include <sys/kobj_impl.h>
#include <sys/firmload.h>
struct firmware_handle {
struct _buf *fh_buf;
off_t fh_size;
};
static firmware_handle_t
firmware_handle_alloc(void)
{
return (kmem_alloc(sizeof (struct firmware_handle), KM_SLEEP));
}
static void
firmware_handle_free(firmware_handle_t fh)
{
kmem_free(fh, sizeof (struct firmware_handle));
}
/*
* firmware_open:
*
* Open a firmware image and return its handle.
*/
int
firmware_open(const char *drvname, const char *imgname, firmware_handle_t *fhp)
{
char *path;
firmware_handle_t fh;
int error;
if (drvname == NULL || imgname == NULL || fhp == NULL)
return (EINVAL);
path = kmem_asprintf("firmware/%s/%s", drvname, imgname);
fh = firmware_handle_alloc();
fh->fh_buf = kobj_open_path(path, 1, 0);
strfree(path);
if (fh->fh_buf == (struct _buf *)-1) {
firmware_handle_free(fh);
return (ENOENT);
}
error = kobj_get_filesize(fh->fh_buf, (uint64_t *)&fh->fh_size);
if (error != 0) {
kobj_close_file(fh->fh_buf);
firmware_handle_free(fh);
return (error);
}
*fhp = fh;
return (0);
}
/*
* firmware_close:
*
* Close a firmware image.
*/
int
firmware_close(firmware_handle_t fh)
{
if (fh != NULL) {
kobj_close_file(fh->fh_buf);
firmware_handle_free(fh);
}
return (0);
}
/*
* firmware_get_size:
*
* Return the total size of a firmware image.
*/
off_t
firmware_get_size(firmware_handle_t fh)
{
ASSERT(fh != NULL);
return (fh->fh_size);
}
/*
* firmware_read:
*
* Read data from a firmware image at the specified offset into
* the provided buffer.
*/
int
firmware_read(firmware_handle_t fh, off_t offset, void *buf, size_t len)
{
ASSERT(fh != NULL);
if (kobj_read_file(fh->fh_buf, buf, len, offset) == -1)
return (-1);
return (0);
}
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