85 lines
2.4 KiB
C
85 lines
2.4 KiB
C
/* $NetBSD: firmload.c,v 1.1 2017/08/10 20:43:12 jmcneill Exp $ */
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/*-
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* Copyright (c) 2017 Jared McNeill <jmcneill@invisible.ca>
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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;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/param.h>
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#include <sys/sysctl.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "firmload.h"
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#define HW_FIRMWARE_PATH "hw.firmware.path"
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#define HW_FIRMWARE_PATH_DELIM ":"
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static int
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firmware_search(char *paths, const char *drvname, const char *imgname)
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{
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char *p, *f;
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const int debug = getenv("FIRMWARE_DEBUG") != NULL;
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int fd;
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p = strtok(paths, HW_FIRMWARE_PATH_DELIM);
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while (p) {
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if (asprintf(&f, "%s/%s/%s", p, drvname, imgname) == -1)
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return -1;
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if (debug)
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printf("%s: trying %s...\n", __func__, f);
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fd = open(f, O_RDONLY);
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free(f);
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if (fd != -1) {
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if (debug)
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printf("%s: using image at %s\n", __func__, f);
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return fd;
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}
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p = strtok(NULL, HW_FIRMWARE_PATH_DELIM);
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}
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/* Not found */
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return -1;
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}
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int
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firmware_open(const char *drvname, const char *imgname)
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{
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size_t len;
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char *paths;
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int fd;
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paths = asysctlbyname(HW_FIRMWARE_PATH, &len);
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if (paths == NULL)
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return -1;
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fd = firmware_search(paths, drvname, imgname);
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free(paths);
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return fd;
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}
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