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1894 | jermar | 1 | /* |
2 | * Copyright (C) 2006 Jakub Jermar |
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3 | * All rights reserved. |
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4 | * |
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5 | * Redistribution and use in source and binary forms, with or without |
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6 | * modification, are permitted provided that the following conditions |
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7 | * are met: |
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8 | * |
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9 | * - Redistributions of source code must retain the above copyright |
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10 | * notice, this list of conditions and the following disclaimer. |
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11 | * - Redistributions in binary form must reproduce the above copyright |
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12 | * notice, this list of conditions and the following disclaimer in the |
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13 | * documentation and/or other materials provided with the distribution. |
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14 | * - The name of the author may not be used to endorse or promote products |
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15 | * derived from this software without specific prior written permission. |
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16 | * |
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17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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27 | */ |
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28 | |||
29 | /** @addtogroup ofw |
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30 | * @{ |
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31 | */ |
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32 | /** |
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33 | * @file |
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34 | * @brief OpenFirmware device tree navigation. |
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35 | * |
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36 | */ |
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37 | |||
1895 | jermar | 38 | #include <genarch/ofw/ofw_tree.h> |
39 | #include <arch/memstr.h> |
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40 | #include <func.h> |
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41 | #include <print.h> |
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42 | #include <panic.h> |
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43 | |||
44 | #define PATH_MAX_LEN 80 |
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45 | #define NAME_BUF_LEN 50 |
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46 | |||
47 | static ofw_tree_node_t *ofw_root; |
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48 | |||
49 | void ofw_tree_init(ofw_tree_node_t *root) |
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50 | { |
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51 | ofw_root = root; |
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52 | } |
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53 | |||
1896 | jermar | 54 | /** Get OpenFirmware node property. |
55 | * |
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56 | * @param node Node in which to lookup the property. |
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57 | * @param name Name of the property. |
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58 | * |
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59 | * @return Pointer to the property structure or NULL if no such property. |
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60 | */ |
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61 | ofw_tree_property_t *ofw_tree_getprop(const ofw_tree_node_t *node, const char *name) |
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62 | { |
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63 | int i; |
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64 | |||
65 | for (i = 0; i < node->properties; i++) { |
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66 | if (strcmp(node->property[i].name, name) == 0) |
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67 | return &node->property[i]; |
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68 | } |
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69 | |||
70 | return NULL; |
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71 | } |
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72 | |||
1895 | jermar | 73 | /** Return value of the 'name' property. |
74 | * |
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75 | * @param node Node of interest. |
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76 | * |
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77 | * @return Value of the 'name' property belonging to the node. |
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78 | */ |
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79 | const char *ofw_tree_node_name(const ofw_tree_node_t *node) |
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80 | { |
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1896 | jermar | 81 | ofw_tree_property_t *prop; |
1895 | jermar | 82 | |
1896 | jermar | 83 | prop = ofw_tree_getprop(node, "name"); |
84 | if (!prop) |
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85 | panic("Node without name property.\n"); |
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86 | |||
87 | if (prop->size < 2) |
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88 | panic("Invalid name property.\n"); |
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1895 | jermar | 89 | |
1896 | jermar | 90 | return prop->value; |
1895 | jermar | 91 | } |
92 | |||
93 | /** Lookup child of given name. |
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94 | * |
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95 | * @param node Node whose child is being looked up. |
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1896 | jermar | 96 | * @param name Name of the child being looked up. |
1895 | jermar | 97 | * |
98 | * @return NULL if there is no such child or pointer to the matching child node. |
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99 | */ |
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1899 | jermar | 100 | ofw_tree_node_t *ofw_tree_find_child(ofw_tree_node_t *node, const char *name) |
1895 | jermar | 101 | { |
102 | ofw_tree_node_t *cur; |
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103 | |||
1896 | jermar | 104 | /* |
105 | * Try to find the disambigued name. |
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106 | */ |
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1895 | jermar | 107 | for (cur = node->child; cur; cur = cur->peer) { |
1896 | jermar | 108 | if (strcmp(cur->da_name, name) == 0) |
1895 | jermar | 109 | return cur; |
110 | } |
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111 | |||
1896 | jermar | 112 | /* |
113 | * Disambigued name not found. |
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114 | * Lets try our luck with possibly ambiguous "name" property. |
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115 | * |
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116 | * We need to do this because paths stored in "/aliases" |
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117 | * are not always fully-qualified. |
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118 | */ |
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119 | for (cur = node->child; cur; cur = cur->peer) { |
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120 | if (strcmp(ofw_tree_node_name(cur), name) == 0) |
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121 | return cur; |
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122 | } |
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123 | |||
1895 | jermar | 124 | return NULL; |
125 | } |
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126 | |||
1899 | jermar | 127 | /** Lookup first child of given device type. |
128 | * |
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129 | * @param node Node whose child is being looked up. |
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130 | * @param name Device type of the child being looked up. |
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131 | * |
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132 | * @return NULL if there is no such child or pointer to the matching child node. |
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133 | */ |
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134 | ofw_tree_node_t *ofw_tree_find_child_by_device_type(ofw_tree_node_t *node, const char *name) |
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135 | { |
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136 | ofw_tree_node_t *cur; |
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137 | ofw_tree_property_t *prop; |
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138 | |||
139 | for (cur = node->child; cur; cur = cur->peer) { |
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140 | prop = ofw_tree_getprop(cur, "device_type"); |
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141 | if (!prop || !prop->value) |
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142 | continue; |
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143 | if (strcmp(prop->value, name) == 0) |
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144 | return cur; |
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145 | } |
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146 | |||
147 | return NULL; |
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148 | } |
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149 | |||
150 | /** Lookup first peer of given device type. |
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151 | * |
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152 | * @param node Node whose peer is being looked up. |
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153 | * @param name Device type of the child being looked up. |
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154 | * |
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155 | * @return NULL if there is no such child or pointer to the matching child node. |
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156 | */ |
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157 | ofw_tree_node_t *ofw_tree_find_peer_by_device_type(ofw_tree_node_t *node, const char *name) |
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158 | { |
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159 | ofw_tree_node_t *cur; |
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160 | ofw_tree_property_t *prop; |
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161 | |||
162 | for (cur = node->peer; cur; cur = cur->peer) { |
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163 | prop = ofw_tree_getprop(cur, "device_type"); |
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164 | if (!prop || !prop->value) |
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165 | continue; |
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166 | if (strcmp(prop->value, name) == 0) |
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167 | return cur; |
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168 | } |
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169 | |||
170 | return NULL; |
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171 | } |
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172 | |||
173 | |||
1895 | jermar | 174 | /** Lookup OpenFirmware node by its path. |
175 | * |
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176 | * @param path Path to the node. |
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177 | * |
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178 | * @return NULL if there is no such node or pointer to the leaf node. |
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179 | */ |
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180 | ofw_tree_node_t *ofw_tree_lookup(const char *path) |
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181 | { |
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182 | char buf[NAME_BUF_LEN+1]; |
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183 | ofw_tree_node_t *node = ofw_root; |
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184 | index_t i, j; |
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185 | |||
186 | if (path[0] != '/') |
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187 | return NULL; |
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188 | |||
189 | for (i = 1; i < strlen(path) && node; i = j + 1) { |
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190 | for (j = i; j < strlen(path) && path[j] != '/'; j++) |
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191 | ; |
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192 | if (i == j) /* skip extra slashes */ |
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193 | continue; |
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194 | |||
195 | memcpy(buf, &path[i], j - i); |
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196 | buf[j - i] = '\0'; |
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197 | node = ofw_tree_find_child(node, buf); |
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198 | } |
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199 | |||
200 | return node; |
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201 | } |
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202 | |||
203 | /** Recursively print subtree rooted in a node. |
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204 | * |
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205 | * @param node Root of the subtree. |
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206 | * @param path Current path, NULL for the very root of the entire tree. |
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207 | */ |
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208 | static void ofw_tree_node_print(const ofw_tree_node_t *node, const char *path) |
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209 | { |
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210 | char p[PATH_MAX_LEN]; |
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211 | |||
212 | if (node->parent) { |
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213 | snprintf(p, PATH_MAX_LEN, "%s/%s", path, node->da_name); |
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214 | printf("%s\n", p); |
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215 | } else { |
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216 | snprintf(p, PATH_MAX_LEN, "%s", node->da_name); |
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217 | printf("/\n"); |
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218 | } |
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219 | |||
220 | if (node->child) |
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221 | ofw_tree_node_print(node->child, p); |
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222 | |||
223 | if (node->peer) |
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224 | ofw_tree_node_print(node->peer, path); |
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225 | } |
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226 | |||
227 | /** Print the structure of the OpenFirmware device tree. */ |
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228 | void ofw_tree_print(void) |
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229 | { |
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230 | ofw_tree_node_print(ofw_root, NULL); |
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231 | } |
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232 | |||
1894 | jermar | 233 | /** @} |
234 | */ |