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| 1 /* | |
| 2 * Copyright (C) 2008 The Android Open Source Project | |
| 3 * | |
| 4 * Licensed under the Apache License, Version 2.0 (the "License"); | |
| 5 * you may not use this file except in compliance with the License. | |
| 6 * You may obtain a copy of the License at | |
| 7 * | |
| 8 * http://www.apache.org/licenses/LICENSE-2.0 | |
| 9 * | |
| 10 * Unless required by applicable law or agreed to in writing, software | |
| 11 * distributed under the License is distributed on an "AS IS" BASIS, | |
| 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
| 13 * See the License for the specific language governing permissions and | |
| 14 * limitations under the License. | |
| 15 */ | |
| 16 | |
| 17 #include <hardware/hardware.h> | |
| 18 | |
| 19 #include <cutils/properties.h> | |
| 20 | |
| 21 #include <dlfcn.h> | |
| 22 #include <string.h> | |
| 23 #include <pthread.h> | |
| 24 #include <errno.h> | |
| 25 #include <limits.h> | |
| 26 #include <stdlib.h> | |
| 27 | |
| 28 #define LOG_TAG "HAL" | |
| 29 #ifdef ANDROID | |
| 30 #include <utils/Log.h> | |
| 31 #else | |
| 32 #include <stdio.h> | |
| 33 #include <unistd.h> | |
| 34 #include <log/log.h> | |
| 35 #endif | |
| 36 | |
| 37 #if defined(__LP64__) | |
| 38 #define _64 "64" | |
| 39 #else | |
| 40 #define _64 "" | |
| 41 #endif | |
| 42 | |
| 43 /** Base path of the hal modules */ | |
| 44 #ifndef HAL_LIBRARY_PATH1 | |
| 45 #define HAL_LIBRARY_PATH1 "/system/lib" _64 "/hw" | |
| 46 #endif | |
| 47 #ifndef HAL_LIBRARY_PATH2 | |
| 48 #define HAL_LIBRARY_PATH2 "/vendor/lib" _64 "/hw" | |
| 49 #endif | |
| 50 | |
| 51 /** | |
| 52 * There are a set of variant filename for modules. The form of the filename | |
| 53 * is "<MODULE_ID>.variant.so" so for the led module the Dream variants | |
| 54 * of base "ro.product.board", "ro.board.platform" and "ro.arch" would be: | |
| 55 * | |
| 56 * led.trout.so | |
| 57 * led.msm7k.so | |
| 58 * led.ARMV6.so | |
| 59 * led.default.so | |
| 60 */ | |
| 61 | |
| 62 static const char *variant_keys[] = { | |
| 63 "ro.hardware", /* This goes first so that it can pick up a different | |
| 64 file on the emulator. */ | |
| 65 "ro.product.board", | |
| 66 "ro.board.platform", | |
| 67 "ro.arch" | |
| 68 }; | |
| 69 | |
| 70 static const int HAL_VARIANT_KEYS_COUNT = | |
| 71 (sizeof(variant_keys)/sizeof(variant_keys[0])); | |
| 72 | |
| 73 /** | |
| 74 * Load the file defined by the variant and if successful | |
| 75 * return the dlopen handle and the hmi. | |
| 76 * @return 0 = success, !0 = failure. | |
| 77 */ | |
| 78 static int load(const char *id, | |
| 79 const char *path, | |
| 80 const struct hw_module_t **pHmi) | |
| 81 { | |
| 82 int status; | |
| 83 void *handle; | |
| 84 struct hw_module_t *hmi; | |
| 85 | |
| 86 /* | |
| 87 * load the symbols resolving undefined symbols before | |
| 88 * dlopen returns. Since RTLD_GLOBAL is not or'd in with | |
| 89 * RTLD_NOW the external symbols will not be global | |
| 90 */ | |
| 91 handle = dlopen(path, RTLD_NOW); | |
| 92 if (handle == NULL) { | |
| 93 char const *err_str = dlerror(); | |
| 94 ALOGE("load: module=%s\n%s", path, err_str?err_str:"unknown"); | |
| 95 status = -EINVAL; | |
| 96 goto done; | |
| 97 } | |
| 98 | |
| 99 /* Get the address of the struct hal_module_info. */ | |
| 100 const char *sym = HAL_MODULE_INFO_SYM_AS_STR; | |
| 101 hmi = (struct hw_module_t *)dlsym(handle, sym); | |
| 102 if (hmi == NULL) { | |
| 103 ALOGE("load: couldn't find symbol %s", sym); | |
| 104 status = -EINVAL; | |
| 105 goto done; | |
| 106 } | |
| 107 | |
| 108 /* Check that the id matches */ | |
| 109 if (strcmp(id, hmi->id) != 0) { | |
| 110 ALOGE("load: id=%s != hmi->id=%s", id, hmi->id); | |
| 111 status = -EINVAL; | |
| 112 goto done; | |
| 113 } | |
| 114 | |
| 115 hmi->dso = handle; | |
| 116 | |
| 117 /* success */ | |
| 118 status = 0; | |
| 119 | |
| 120 done: | |
| 121 if (status != 0) { | |
| 122 hmi = NULL; | |
| 123 if (handle != NULL) { | |
| 124 dlclose(handle); | |
| 125 handle = NULL; | |
| 126 } | |
| 127 } else { | |
| 128 ALOGV("loaded HAL id=%s path=%s hmi=%p handle=%p", | |
| 129 id, path, *pHmi, handle); | |
| 130 } | |
| 131 | |
| 132 *pHmi = hmi; | |
| 133 | |
| 134 return status; | |
| 135 } | |
| 136 | |
| 137 /* | |
| 138 * Check if a HAL with given name and subname exists, if so return 0, otherwise | |
| 139 * otherwise return negative. On success path will contain the path to the HAL. | |
| 140 */ | |
| 141 static int hw_module_exists(char *path, size_t path_len, const char *name, | |
| 142 const char *subname) | |
| 143 { | |
| 144 char *hal_library_path = getenv("HAL_LIBRARY_PATH"); | |
| 145 if (hal_library_path) { | |
| 146 snprintf(path, path_len, "%s/%s.%s.so", | |
| 147 hal_library_path, name, subname); | |
| 148 if (access(path, R_OK) == 0) | |
| 149 return 0; | |
| 150 } | |
| 151 | |
| 152 snprintf(path, path_len, "%s/%s.%s.so", | |
| 153 HAL_LIBRARY_PATH2, name, subname); | |
| 154 if (access(path, R_OK) == 0) | |
| 155 return 0; | |
| 156 | |
| 157 snprintf(path, path_len, "%s/%s.%s.so", | |
| 158 HAL_LIBRARY_PATH1, name, subname); | |
| 159 if (access(path, R_OK) == 0) | |
| 160 return 0; | |
| 161 | |
| 162 return -ENOENT; | |
| 163 } | |
| 164 | |
| 165 int hw_get_module_by_class(const char *class_id, const char *inst, | |
| 166 const struct hw_module_t **module) | |
| 167 { | |
| 168 int i; | |
| 169 char prop[PATH_MAX]; | |
| 170 char path[PATH_MAX]; | |
| 171 char name[PATH_MAX]; | |
| 172 char prop_name[PATH_MAX]; | |
| 173 | |
| 174 if (inst) | |
| 175 snprintf(name, PATH_MAX, "%s.%s", class_id, inst); | |
| 176 else | |
| 177 strlcpy(name, class_id, PATH_MAX); | |
| 178 | |
| 179 /* | |
| 180 * Here we rely on the fact that calling dlopen multiple times on | |
| 181 * the same .so will simply increment a refcount (and not load | |
| 182 * a new copy of the library). | |
| 183 * We also assume that dlopen() is thread-safe. | |
| 184 */ | |
| 185 | |
| 186 /* First try a property specific to the class and possibly instance */ | |
| 187 snprintf(prop_name, sizeof(prop_name), "ro.hardware.%s", name); | |
| 188 if (property_get(prop_name, prop, NULL) > 0) { | |
| 189 if (hw_module_exists(path, sizeof(path), name, prop) == 0) { | |
| 190 goto found; | |
| 191 } | |
| 192 } | |
| 193 | |
| 194 /* Loop through the configuration variants looking for a module */ | |
| 195 for (i=0 ; i<HAL_VARIANT_KEYS_COUNT; i++) { | |
| 196 if (property_get(variant_keys[i], prop, NULL) == 0) { | |
| 197 continue; | |
| 198 } | |
| 199 if (hw_module_exists(path, sizeof(path), name, prop) == 0) { | |
| 200 goto found; | |
| 201 } | |
| 202 } | |
| 203 | |
| 204 /* Nothing found, try the default */ | |
| 205 if (hw_module_exists(path, sizeof(path), name, "default") == 0) { | |
| 206 goto found; | |
| 207 } | |
| 208 | |
| 209 return -ENOENT; | |
| 210 | |
| 211 found: | |
| 212 /* load the module, if this fails, we're doomed, and we should not try | |
| 213 * to load a different variant. */ | |
| 214 return load(class_id, path, module); | |
| 215 } | |
| 216 | |
| 217 int hw_get_module(const char *id, const struct hw_module_t **module) | |
| 218 { | |
| 219 return hw_get_module_by_class(id, NULL, module); | |
| 220 } | |
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Chromium Code Reviews
Issue 2643643008:
Delete third_party/hwcplus/ (Closed)
