1 /* $NetBSD: drvctl.c,v 1.3 2021/06/21 03:04:27 christos Exp $ */
2
3 /*
4 * Copyright (c) 2010 Jared D. 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 NETBSD FOUNDATION, INC. AND CONTRIBUTORS
17 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
18 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
19 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
20 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
26 * POSSIBILITY OF SUCH DAMAGE.
27 */
28
29 #include <stdbool.h>
30 #include <stdlib.h>
31 #include <string.h>
32 #include <unistd.h>
33
34 #include "drvctl.h"
35
36 static int
drvctl_list(int fd,const char * name,struct devlistargs * laa)37 drvctl_list(int fd, const char *name, struct devlistargs *laa)
38 {
39 size_t children;
40
41 memset(laa, 0, sizeof(*laa));
42 strlcpy(laa->l_devname, name, sizeof(laa->l_devname));
43 if (ioctl(fd, DRVLISTDEV, laa) == -1)
44 return -1;
45 children = laa->l_children;
46 laa->l_childname = malloc(children * sizeof(laa->l_childname[0]));
47 if (laa->l_childname == NULL)
48 return -1;
49 if (ioctl(fd, DRVLISTDEV, laa) == -1)
50 return -1;
51 return 0;
52 }
53
54 static bool
drvctl_get_properties(int fd,const char * devnode,prop_dictionary_t * props)55 drvctl_get_properties(int fd, const char *devnode, prop_dictionary_t *props)
56 {
57 prop_dictionary_t command_dict;
58 prop_dictionary_t args_dict;
59 prop_dictionary_t results_dict;
60 int8_t perr;
61 int error;
62 bool rv;
63
64 command_dict = prop_dictionary_create();
65 args_dict = prop_dictionary_create();
66
67 prop_dictionary_set_string_nocopy(command_dict, "drvctl-command",
68 "get-properties");
69 prop_dictionary_set_string_nocopy(args_dict, "device-name", devnode);
70 prop_dictionary_set(command_dict, "drvctl-arguments", args_dict);
71 prop_object_release(args_dict);
72
73 error = prop_dictionary_sendrecv_ioctl(command_dict, fd,
74 DRVCTLCOMMAND, &results_dict);
75 prop_object_release(command_dict);
76 if (error)
77 return false;
78
79 rv = prop_dictionary_get_int8(results_dict, "drvctl-error", &perr);
80 if (rv == false || perr != 0) {
81 prop_object_release(results_dict);
82 return false;
83 }
84
85 if (props) {
86 prop_dictionary_t result_data;
87 result_data = prop_dictionary_get(results_dict,
88 "drvctl-result-data");
89 if (result_data)
90 *props = prop_dictionary_copy(result_data);
91 }
92
93 prop_object_release(results_dict);
94
95 return true;
96 }
97
98 static int
drvctl_search(int fd,const char * curnode,const char * dvname,void (* callback)(void *,const char *,const char *,unsigned int),void * args)99 drvctl_search(int fd, const char *curnode, const char *dvname,
100 void (*callback)(void *, const char *, const char *, unsigned int),
101 void *args)
102 {
103 struct devlistargs laa;
104 unsigned int i;
105 uint32_t unit;
106 bool rv;
107
108 if (drvctl_list(fd, curnode, &laa) == -1)
109 return -1;
110
111 for (i = 0; i < laa.l_children; i++) {
112 prop_dictionary_t props = NULL;
113 const char *curdvname;
114
115 rv = drvctl_get_properties(fd, laa.l_childname[i], &props);
116 if (rv == false || props == NULL)
117 continue;
118 rv = prop_dictionary_get_string(props,
119 "device-driver", &curdvname);
120 if (rv == true && strcmp(curdvname, dvname) == 0) {
121 rv = prop_dictionary_get_uint32(props,
122 "device-unit", &unit);
123 if (rv == true)
124 callback(args, curnode,
125 laa.l_childname[i], unit);
126 }
127 prop_object_release(props);
128
129 if (drvctl_search(fd, laa.l_childname[i], dvname,
130 callback, args) == -1)
131 return -1;
132 }
133
134 return 0;
135 }
136
137 int
drvctl_foreach(int fd,const char * dvname,void (* callback)(void *,const char *,const char *,unsigned int),void * args)138 drvctl_foreach(int fd, const char *dvname,
139 void (*callback)(void *, const char *, const char *, unsigned int),
140 void *args)
141 {
142 return drvctl_search(fd, "", dvname, callback, args);
143 }
144