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authorThe Android Open Source Project <initial-contribution@android.com>2009-03-03 18:28:48 -0800
committerThe Android Open Source Project <initial-contribution@android.com>2009-03-03 18:28:48 -0800
commitd51f49a11dad52e172e4d7f6fcdf571f24efbcd5 (patch)
tree4b825dc642cb6eb9a060e54bf8d69288fbee4904 /hardware.c
parentb5d75924d7a17452b157dc12de31d254f8af1831 (diff)
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auto import from //depot/cupcake/@135843
Diffstat (limited to 'hardware.c')
-rw-r--r--hardware.c167
1 files changed, 0 insertions, 167 deletions
diff --git a/hardware.c b/hardware.c
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-/*
- * Copyright (C) 2008 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-#include <hardware/hardware.h>
-
-#include <cutils/properties.h>
-
-#include <dlfcn.h>
-#include <string.h>
-#include <pthread.h>
-#include <errno.h>
-#include <limits.h>
-
-#define LOG_TAG "HAL"
-#include <utils/Log.h>
-
-/** Base path of the hal modules */
-#define HAL_LIBRARY_PATH "/system/lib/hw"
-
-/**
- * There are a set of variant filename for modules. The form of the filename
- * is "<MODULE_ID>.variant.so" so for the led module the Dream variants
- * of base "ro.product.board", "ro.board.platform" and "ro.arch" would be:
- *
- * led.trout.so
- * led.msm7k.so
- * led.ARMV6.so
- * led.default.so
- */
-
-#define HAL_DEFAULT_VARIANT "default"
-#define HAL_VARIANT_KEYS_COUNT 4
-static const char *variant_keys[HAL_VARIANT_KEYS_COUNT] = {
- "ro.product.board",
- "ro.board.platform",
- "ro.arch",
- HAL_DEFAULT_VARIANT
-};
-
-/**
- * Load the file defined by the path and if succesfull
- * return the dlopen handle and the hmi.
- * @return 0 = success, !0 = failure.
- */
-static int load(const char *id,
- const char *path,
- void **pHandle,
- const struct hw_module_t **pHmi)
-{
- int status;
- void *handle;
- const struct hw_module_t *hmi;
-
- LOGV("load: E id=%s path=%s", id, path);
-
- /*
- * load the symbols resolving undefined symbols before
- * dlopen returns. Since RTLD_GLOBAL is not or'd in with
- * RTLD_NOW the external symbols will not be global
- */
- handle = dlopen(path, RTLD_NOW);
- if (handle == NULL) {
- char const *err_str = dlerror();
- LOGW("load: module=%s error=%s", path, err_str);
- status = -EINVAL;
- goto done;
- }
-
- /* Get the address of the struct hal_module_info. */
- const char *sym = HAL_MODULE_INFO_SYM_AS_STR;
- hmi = (const struct hw_module_t *)dlsym(handle, sym);
- if (hmi == NULL) {
- char const *err_str = dlerror();
- LOGE("load: couldn't find symbol %s", sym);
- status = -EINVAL;
- goto done;
- }
-
- /* Check that the id matches */
- if (strcmp(id, hmi->id) != 0) {
- LOGE("load: id=%s != hmi->id=%s", id, hmi->id);
- status = -EINVAL;
- goto done;
- }
-
- /* success */
- status = 0;
-
-done:
- if (status != 0) {
- hmi = NULL;
- if (handle != NULL) {
- dlclose(handle);
- handle = NULL;
- }
- }
-
- *pHmi = hmi;
- *pHandle = handle;
-
- LOGV("load: X id=%s path=%s hmi=%p pHandle=%p status=%d",
- id, path, *pHmi, *pHandle, status);
- return status;
-}
-
-int hw_get_module(const char *id, const struct hw_module_t **module)
-{
- int status;
- const struct hw_module_t *hmi = NULL;
- char path[PATH_MAX];
- char variant[PATH_MAX];
- void *handle = NULL;
- int i;
-
- /*
- * Here we rely on the fact that calling dlopen multiple times on
- * the same .so will simply increment a refcount (and not load
- * a new copy of the library).
- * We also assume that dlopen() is thread-safe.
- */
-
- LOGV("hal_module_info_get: Load module id=%s", id);
-
- /* Loop through the configuration variants looking for a module */
- status = -EINVAL;
- for (i = 0; (status != 0) && (i < HAL_VARIANT_KEYS_COUNT); i++) {
-
- /* Get variant or default */
- if (strcmp(variant_keys[i], HAL_DEFAULT_VARIANT) == 0) {
- strncpy(variant, HAL_DEFAULT_VARIANT, sizeof(variant)-1);
- variant[sizeof(variant)-1] = 0;
- } else {
- if (property_get(variant_keys[i], variant, NULL) == 0) {
- continue;
- }
- }
-
- /* Construct the path then try to load */
- snprintf(path, sizeof(path), "%s/%s.%s.so",
- HAL_LIBRARY_PATH, id, variant);
- status = load(id, path, &handle, &hmi);
- }
- if (status != 0) {
- hmi = NULL;
- if (handle != NULL) {
- dlclose(handle);
- }
- }
-
- *module = hmi;
- LOGV("hal_module_info_get: X id=%s hmi=%p status=%d", id, hmi, status);
-
- return status;
-}