xref: /freebsd/stand/libofw/devicename.c (revision 56b17de1e8360fe131d425de20b5e75ff3ea897c)
1 /*-
2  * Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
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, this list of conditions and the following disclaimer.
10  * 2. Redistributions in binary form must reproduce the above copyright
11  *    notice, this list of conditions and the following disclaimer in the
12  *    documentation and/or other materials provided with the distribution.
13  *
14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24  * SUCH DAMAGE.
25  */
26 
27 #include <stand.h>
28 
29 #include "bootstrap.h"
30 #include "libofw.h"
31 
32 /*
33  * Point (dev) at an allocated device specifier for the device matching the
34  * path in (devspec). If it contains an explicit device specification,
35  * use that.  If not, use the default device.
36  */
37 int
38 ofw_getdev(void **vdev, const char *devspec, const char **path)
39 {
40 	struct devdesc **dev = (struct devdesc **)vdev;
41 	int rv;
42 
43 	/*
44 	 * If it looks like this is just a path and no device, go with the
45 	 * current device.
46 	 */
47 	if (devspec == NULL || strpbrk(devspec, ":@") == NULL) {
48 		rv = devparse(dev, getenv("currdev"), NULL);
49 		if (rv == 0  && path != NULL)
50 			*path = devspec;
51 		return (rv);
52 	}
53 
54 	/*
55 	 * Try to parse the device name off the beginning of the devspec
56 	 */
57 	return (devparse(dev, devspec, path));
58 }
59 
60 /*
61  * Search the OFW (path) for a node that's of (want_type).
62  */
63 phandle_t
64 ofw_path_to_handle(const char *ofwpath, const char *want_type, const char **path)
65 {
66 	const char *p, *s;
67 	char name[256];
68 	char type[64];
69 	phandle_t handle;
70 	int len;
71 
72 	for (p = s = ofwpath; *s != '\0'; p = s) {
73 		if ((s = strchr(p + 1, '/')) == NULL)
74 			s = strchr(p, '\0');
75 		len = s - ofwpath;
76 		if (len >= sizeof(name))
77 			return ((phandle_t)-1);
78 		bcopy(ofwpath, name, len);
79 		name[len] = '\0';
80 		if ((handle = OF_finddevice(name)) == -1)
81 			continue;
82 		if (OF_getprop(handle, "device_type", type, sizeof(type)) == -1)
83 			continue;
84 		if (strcmp(want_type, type) == 0) {
85 			*path = s;
86 			return (handle);
87 		}
88 	}
89 	return ((phandle_t)-1);
90 }
91 
92 int
93 ofw_common_parsedev(struct devdesc **dev, const char *devspec, const char **path,
94     const char *ofwtype)
95 {
96 	const char *rem_path;
97 	struct ofw_devdesc *idev;
98 
99 	if (ofw_path_to_handle(devspec, ofwtype, &rem_path) == -1)
100 		return (ENOENT);
101 	idev = malloc(sizeof(struct ofw_devdesc));
102 	if (idev == NULL) {
103 		printf("ofw_parsedev: malloc failed\n");
104 		return (ENOMEM);
105 	};
106 	strlcpy(idev->d_path, devspec, min(rem_path - devspec + 1,
107 		sizeof(idev->d_path)));
108 	*dev = &idev->dd;
109 	if (path != NULL)
110 		*path = rem_path;
111 	return (0);
112 }
113