1 /* $NetBSD: drvctl.c,v 1.2 2010/09/02 02:17:35 jmcneill 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 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 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_cstring_nocopy(command_dict, "drvctl-command", 68 "get-properties"); 69 prop_dictionary_set_cstring_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 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_cstring_nocopy(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 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