1 /* $NetBSD: firmload.c,v 1.1 2017/08/10 20:43:12 jmcneill Exp $ */
2
3 /*-
4 * Copyright (c) 2017 Jared McNeill <jmcneill@invisible.ca>
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, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
22 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 #include <sys/param.h>
30 #include <sys/sysctl.h>
31 #include <fcntl.h>
32 #include <stdio.h>
33 #include <stdlib.h>
34 #include <string.h>
35
36 #include "firmload.h"
37
38 #define HW_FIRMWARE_PATH "hw.firmware.path"
39 #define HW_FIRMWARE_PATH_DELIM ":"
40
41 static int
firmware_search(char * paths,const char * drvname,const char * imgname)42 firmware_search(char *paths, const char *drvname, const char *imgname)
43 {
44 char *p, *f;
45 const int debug = getenv("FIRMWARE_DEBUG") != NULL;
46 int fd;
47
48 p = strtok(paths, HW_FIRMWARE_PATH_DELIM);
49 while (p) {
50 if (asprintf(&f, "%s/%s/%s", p, drvname, imgname) == -1)
51 return -1;
52 if (debug)
53 printf("%s: trying %s...\n", __func__, f);
54 fd = open(f, O_RDONLY);
55 free(f);
56 if (fd != -1) {
57 if (debug)
58 printf("%s: using image at %s\n", __func__, f);
59 return fd;
60 }
61 p = strtok(NULL, HW_FIRMWARE_PATH_DELIM);
62 }
63
64 /* Not found */
65 return -1;
66 }
67
68 int
firmware_open(const char * drvname,const char * imgname)69 firmware_open(const char *drvname, const char *imgname)
70 {
71 size_t len;
72 char *paths;
73 int fd;
74
75 paths = asysctlbyname(HW_FIRMWARE_PATH, &len);
76 if (paths == NULL)
77 return -1;
78
79 fd = firmware_search(paths, drvname, imgname);
80
81 free(paths);
82
83 return fd;
84 }
85