diff --git a/modules/sensors/multihal.cpp b/modules/sensors/multihal.cpp
new file mode 100644
index 0000000..a145c37
--- /dev/null
+++ b/modules/sensors/multihal.cpp
@@ -0,0 +1,586 @@
+/*
+ * Copyright (C) 2013 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/sensors.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <dirent.h>
+#include <math.h>
+#include <poll.h>
+#include <pthread.h>
+#include <cutils/atomic.h>
+
+#define LOG_NDEBUG 1
+#include <cutils/log.h>
+
+#include <vector>
+#include <map>
+
+#include <stdio.h>
+#include <dlfcn.h>
+#include <SensorEventQueue.h>
+
+
+static const char* CONFIG_FILENAME = "/system/etc/sensors/hals.conf";
+static const char* LEGAL_SUBHAL_PATH_PREFIX = "/system/lib/hw/";
+static const int MAX_CONF_LINE_LENGTH = 1024;
+
+static pthread_mutex_t init_modules_mutex = PTHREAD_MUTEX_INITIALIZER;
+static pthread_mutex_t init_sensors_mutex = PTHREAD_MUTEX_INITIALIZER;
+
+// This mutex is shared by all queues
+static pthread_mutex_t queue_mutex = PTHREAD_MUTEX_INITIALIZER;
+
+// Used to pause the multihal poll(). Broadcasted by sub-polling tasks if waiting_for_data.
+static pthread_cond_t data_available_cond = PTHREAD_COND_INITIALIZER;
+bool waiting_for_data = false;
+
+/*
+ * Vector of sub modules, whose indexes are referred to ni this file as module_index.
+ */
+static std::vector<hw_module_t *> *sub_hw_modules = NULL;
+
+/*
+ * Comparable class that globally identifies a sensor, by module index and local handle.
+ * A module index is the module's index in sub_hw_modules.
+ * A local handle is the handle the sub-module assigns to a sensor.
+ */
+struct FullHandle {
+    int moduleIndex;
+    int localHandle;
+
+    bool operator<(const FullHandle &that) const {
+        if (moduleIndex < that.moduleIndex) {
+            return true;
+        }
+        if (moduleIndex > that.moduleIndex) {
+            return false;
+        }
+        return localHandle < that.localHandle;
+    }
+
+    bool operator==(const FullHandle &that) const {
+        return moduleIndex == that.moduleIndex && localHandle == that.localHandle;
+    }
+};
+
+std::map<int, FullHandle> global_to_full;
+std::map<FullHandle, int> full_to_global;
+int next_global_handle = 1;
+
+static int assign_global_handle(int module_index, int local_handle) {
+    int global_handle = next_global_handle++;
+    FullHandle full_handle;
+    full_handle.moduleIndex = module_index;
+    full_handle.localHandle = local_handle;
+    full_to_global[full_handle] = global_handle;
+    global_to_full[global_handle] = full_handle;
+    return global_handle;
+}
+
+static int get_local_handle(int global_handle) {
+    return global_to_full[global_handle].localHandle;
+}
+
+static int get_module_index(int global_handle) {
+    FullHandle f = global_to_full[global_handle];
+    ALOGV("FullHandle for global_handle %d: moduleIndex %d, localHandle %d",
+            global_handle, f.moduleIndex, f.localHandle);
+    return f.moduleIndex;
+}
+
+static const int SENSOR_EVENT_QUEUE_CAPACITY = 20;
+
+struct TaskContext {
+  sensors_poll_device_t* device;
+  SensorEventQueue* queue;
+};
+
+void *writerTask(void* ptr) {
+    ALOGV("writerTask STARTS");
+    TaskContext* ctx = (TaskContext*)ptr;
+    sensors_poll_device_t* device = ctx->device;
+    SensorEventQueue* queue = ctx->queue;
+    sensors_event_t* buffer;
+    int eventsPolled;
+    while (1) {
+        pthread_mutex_lock(&queue_mutex);
+        if (queue->waitForSpace(&queue_mutex)) {
+            ALOGV("writerTask waited for space");
+        }
+        int bufferSize = queue->getWritableRegion(SENSOR_EVENT_QUEUE_CAPACITY, &buffer);
+        // Do blocking poll outside of lock
+        pthread_mutex_unlock(&queue_mutex);
+
+        ALOGV("writerTask before poll() - bufferSize = %d", bufferSize);
+        eventsPolled = device->poll(device, buffer, bufferSize);
+        ALOGV("writerTask poll() got %d events.", eventsPolled);
+        if (eventsPolled == 0) {
+            continue;
+        }
+        pthread_mutex_lock(&queue_mutex);
+        queue->markAsWritten(eventsPolled);
+        ALOGV("writerTask wrote %d events", eventsPolled);
+        if (waiting_for_data) {
+            ALOGV("writerTask - broadcast data_available_cond");
+            pthread_cond_broadcast(&data_available_cond);
+        }
+        pthread_mutex_unlock(&queue_mutex);
+    }
+    // never actually returns
+    return NULL;
+}
+
+/*
+ * Cache of all sensors, with original handles replaced by global handles.
+ * This will be handled to get_sensors_list() callers.
+ */
+static struct sensor_t const* global_sensors_list = NULL;
+static int global_sensors_count = -1;
+
+/*
+ * Extends a sensors_poll_device_1 by including all the sub-module's devices.
+ */
+struct sensors_poll_context_t {
+    /*
+     * This is the device that SensorDevice.cpp uses to make API calls
+     * to the multihal, which fans them out to sub-HALs.
+     */
+    sensors_poll_device_1 proxy_device; // must be first
+
+    void addSubHwDevice(struct hw_device_t*);
+
+    int activate(int handle, int enabled);
+    int setDelay(int handle, int64_t ns);
+    int poll(sensors_event_t* data, int count);
+    int batch(int handle, int flags, int64_t period_ns, int64_t timeout);
+    int flush(int handle);
+    int close();
+
+    std::vector<hw_device_t*> sub_hw_devices;
+    std::vector<SensorEventQueue*> queues;
+    std::vector<pthread_t> threads;
+    int nextReadIndex;
+
+    sensors_poll_device_t* get_v0_device_by_handle(int global_handle);
+    sensors_poll_device_1_t* get_v1_device_by_handle(int global_handle);
+    int get_device_version_by_handle(int global_handle);
+
+    void copy_event_remap_handle(sensors_event_t* src, sensors_event_t* dest, int sub_index);
+};
+
+void sensors_poll_context_t::addSubHwDevice(struct hw_device_t* sub_hw_device) {
+    ALOGV("addSubHwDevice");
+    this->sub_hw_devices.push_back(sub_hw_device);
+
+    SensorEventQueue *queue = new SensorEventQueue(SENSOR_EVENT_QUEUE_CAPACITY);
+    this->queues.push_back(queue);
+
+    TaskContext* taskContext = new TaskContext();
+    taskContext->device = (sensors_poll_device_t*) sub_hw_device;
+    taskContext->queue = queue;
+
+    pthread_t writerThread;
+    pthread_create(&writerThread, NULL, writerTask, taskContext);
+    this->threads.push_back(writerThread);
+}
+
+sensors_poll_device_t* sensors_poll_context_t::get_v0_device_by_handle(int handle) {
+    int sub_index = get_module_index(handle);
+    return (sensors_poll_device_t*) this->sub_hw_devices[sub_index];
+}
+
+sensors_poll_device_1_t* sensors_poll_context_t::get_v1_device_by_handle(int handle) {
+    int sub_index = get_module_index(handle);
+    return (sensors_poll_device_1_t*) this->sub_hw_devices[sub_index];
+}
+
+int sensors_poll_context_t::get_device_version_by_handle(int handle) {
+    sensors_poll_device_t* v0 = this->get_v0_device_by_handle(handle);
+    return v0->common.version;
+}
+
+int sensors_poll_context_t::activate(int handle, int enabled) {
+    ALOGV("activate");
+    sensors_poll_device_t* v0 = this->get_v0_device_by_handle(handle);
+    int retval = v0->activate(v0, get_local_handle(handle), enabled);
+    ALOGV("retval %d", retval);
+    return retval;
+}
+
+int sensors_poll_context_t::setDelay(int handle, int64_t ns) {
+    ALOGV("setDelay");
+    sensors_poll_device_t* v0 = this->get_v0_device_by_handle(handle);
+    int retval = v0->setDelay(v0, get_local_handle(handle), ns);
+    ALOGV("retval %d", retval);
+    return retval;
+}
+
+void sensors_poll_context_t::copy_event_remap_handle(sensors_event_t* dest, sensors_event_t* src,
+        int sub_index) {
+    memcpy(dest, src, sizeof(struct sensors_event_t));
+    // A normal event's "sensor" field is a local handle. Convert it to a global handle.
+    // A meta-data event must have its sensor set to 0, but it has a nested event
+    // with a local handle that needs to be converted to a global handle.
+    FullHandle full_handle;
+    full_handle.moduleIndex = sub_index;
+    // If it's a metadata event, rewrite the inner payload, not the sensor field.
+    if (dest->type == SENSOR_TYPE_META_DATA) {
+        full_handle.localHandle = dest->meta_data.sensor;
+        dest->meta_data.sensor = full_to_global[full_handle];
+    } else {
+        full_handle.localHandle = dest->sensor;
+        dest->sensor = full_to_global[full_handle];
+    }
+}
+
+int sensors_poll_context_t::poll(sensors_event_t *data, int maxReads) {
+    ALOGV("poll");
+    int empties = 0;
+    int queueCount = (int)this->queues.size();
+    int eventsRead = 0;
+
+    pthread_mutex_lock(&queue_mutex);
+    while (eventsRead == 0) {
+        while (empties < queueCount && eventsRead < maxReads) {
+            SensorEventQueue* queue = this->queues.at(this->nextReadIndex);
+            sensors_event_t* event = queue->peek();
+            if (event == NULL) {
+                empties++;
+            } else {
+                empties = 0;
+                this->copy_event_remap_handle(&data[eventsRead++], event, nextReadIndex);
+                queue->dequeue();
+            }
+            this->nextReadIndex = (this->nextReadIndex + 1) % queueCount;
+        }
+        if (eventsRead == 0) {
+            // The queues have been scanned and none contain data, so wait.
+            ALOGV("poll stopping to wait for data");
+            waiting_for_data = true;
+            pthread_cond_wait(&data_available_cond, &queue_mutex);
+            waiting_for_data = false;
+            empties = 0;
+        }
+    }
+    pthread_mutex_unlock(&queue_mutex);
+    ALOGV("poll returning %d events.", eventsRead);
+
+    return eventsRead;
+}
+
+int sensors_poll_context_t::batch(int handle, int flags, int64_t period_ns, int64_t timeout) {
+    ALOGV("batch");
+    int retval = -EINVAL;
+    int version = this->get_device_version_by_handle(handle);
+    if (version >= SENSORS_DEVICE_API_VERSION_1_0) {
+        sensors_poll_device_1_t* v1 = this->get_v1_device_by_handle(handle);
+        retval = v1->batch(v1, get_local_handle(handle), flags, period_ns, timeout);
+    }
+    ALOGV("retval %d", retval);
+    return retval;
+}
+
+int sensors_poll_context_t::flush(int handle) {
+    ALOGV("flush");
+    int retval = -EINVAL;
+    int version = this->get_device_version_by_handle(handle);
+    if (version >= SENSORS_DEVICE_API_VERSION_1_0) {
+        sensors_poll_device_1_t* v1 = this->get_v1_device_by_handle(handle);
+        retval = v1->flush(v1, get_local_handle(handle));
+    }
+    ALOGV("retval %d", retval);
+    return retval;
+}
+
+int sensors_poll_context_t::close() {
+    ALOGV("close");
+    for (std::vector<hw_device_t*>::iterator it = this->sub_hw_devices.begin();
+            it != this->sub_hw_devices.end(); it++) {
+        hw_device_t* dev = *it;
+        int retval = dev->close(dev);
+        ALOGV("retval %d", retval);
+    }
+    return 0;
+}
+
+
+static int device__close(struct hw_device_t *dev) {
+    sensors_poll_context_t* ctx = (sensors_poll_context_t*) dev;
+    if (ctx != NULL) {
+        int retval = ctx->close();
+        delete ctx;
+    }
+    return 0;
+}
+
+static int device__activate(struct sensors_poll_device_t *dev, int handle,
+        int enabled) {
+    sensors_poll_context_t* ctx = (sensors_poll_context_t*) dev;
+    return ctx->activate(handle, enabled);
+}
+
+static int device__setDelay(struct sensors_poll_device_t *dev, int handle,
+        int64_t ns) {
+    sensors_poll_context_t* ctx = (sensors_poll_context_t*) dev;
+    return ctx->setDelay(handle, ns);
+}
+
+static int device__poll(struct sensors_poll_device_t *dev, sensors_event_t* data,
+        int count) {
+    sensors_poll_context_t* ctx = (sensors_poll_context_t*) dev;
+    return ctx->poll(data, count);
+}
+
+static int device__batch(struct sensors_poll_device_1 *dev, int handle,
+        int flags, int64_t period_ns, int64_t timeout) {
+    sensors_poll_context_t* ctx = (sensors_poll_context_t*) dev;
+    return ctx->batch(handle, flags, period_ns, timeout);
+}
+
+static int device__flush(struct sensors_poll_device_1 *dev, int handle) {
+    sensors_poll_context_t* ctx = (sensors_poll_context_t*) dev;
+    return ctx->flush(handle);
+}
+
+static int open_sensors(const struct hw_module_t* module, const char* name,
+        struct hw_device_t** device);
+
+static bool starts_with(const char* s, const char* prefix) {
+    if (s == NULL || prefix == NULL) {
+        return false;
+    }
+    size_t s_size = strlen(s);
+    size_t prefix_size = strlen(prefix);
+    return s_size >= prefix_size && strncmp(s, prefix, prefix_size) == 0;
+}
+
+/*
+ * Adds valid paths from the config file to the vector passed in.
+ * The vector must not be null.
+ */
+static void get_so_paths(std::vector<char*> *so_paths) {
+    FILE *conf_file = fopen(CONFIG_FILENAME, "r");
+    if (conf_file == NULL) {
+        ALOGW("No multihal config file found at %s", CONFIG_FILENAME);
+        return;
+    }
+    ALOGI("Multihal config file found at %s", CONFIG_FILENAME);
+    char *line = NULL;
+    size_t len = 0;
+    int line_count = 0;
+    while (getline(&line, &len, conf_file) != -1) {
+        // overwrite trailing eoln with null char
+        char* pch = strchr(line, '\n');
+        if (pch != NULL) {
+            *pch = '\0';
+        }
+        ALOGV("config file line #%d: '%s'", ++line_count, line);
+        char *real_path = realpath(line, NULL);
+        if (starts_with(real_path, LEGAL_SUBHAL_PATH_PREFIX)) {
+            ALOGI("accepting valid path '%s'", real_path);
+            char* compact_line = new char[strlen(real_path) + 1];
+            strcpy(compact_line, real_path);
+            so_paths->push_back(compact_line);
+        } else {
+            ALOGW("rejecting path '%s' because it does not start with '%s'",
+                    real_path, LEGAL_SUBHAL_PATH_PREFIX);
+        }
+        free(real_path);
+    }
+    free(line);
+    fclose(conf_file);
+    ALOGV("hals.conf contained %d lines", line_count);
+}
+
+/*
+ * Ensures that the sub-module array is initialized.
+ * This can be first called from get_sensors_list or from open_sensors.
+ */
+static void lazy_init_modules() {
+    pthread_mutex_lock(&init_modules_mutex);
+    if (sub_hw_modules != NULL) {
+        pthread_mutex_unlock(&init_modules_mutex);
+        return;
+    }
+    std::vector<char*> *so_paths = new std::vector<char*>();
+    get_so_paths(so_paths);
+
+    // dlopen the module files and cache their module symbols in sub_hw_modules
+    sub_hw_modules = new std::vector<hw_module_t *>();
+    dlerror(); // clear any old errors
+    const char* sym = HAL_MODULE_INFO_SYM_AS_STR;
+    for (std::vector<char*>::iterator it = so_paths->begin(); it != so_paths->end(); it++) {
+        char* path = *it;
+        void* lib_handle = dlopen(path, RTLD_LAZY);
+        if (lib_handle == NULL) {
+            ALOGW("dlerror(): %s", dlerror());
+        } else {
+            ALOGI("hal lib was loaded: %s", path);
+            ALOGV("Opening symbol \"%s\"", sym);
+            // clear old errors
+            dlerror();
+            struct hw_module_t* module = (hw_module_t*) dlsym(lib_handle, sym);
+            const char* error;
+            if ((error = dlerror()) != NULL) {
+                ALOGW("Error calling dlsym: %s", error);
+            } else if (module == NULL) {
+                ALOGW("module == NULL");
+            } else {
+                ALOGI("OK, dlsym()'ed \"%s\"", sym);
+                sub_hw_modules->push_back(module);
+            }
+        }
+    }
+    pthread_mutex_unlock(&init_modules_mutex);
+}
+
+/*
+ * Lazy-initializes global_sensors_count, global_sensors_list, and module_sensor_handles.
+ */
+static void lazy_init_sensors_list() {
+    ALOGV("lazy_init_sensors_list");
+    pthread_mutex_lock(&init_sensors_mutex);
+    if (global_sensors_list != NULL) {
+        // already initialized
+        pthread_mutex_unlock(&init_sensors_mutex);
+        ALOGV("lazy_init_sensors_list - early return");
+        return;
+    }
+
+    ALOGV("lazy_init_sensors_list needs to do work");
+    lazy_init_modules();
+
+    // Count all the sensors, then allocate an array of blanks.
+    global_sensors_count = 0;
+    const struct sensor_t *subhal_sensors_list;
+    for (std::vector<hw_module_t*>::iterator it = sub_hw_modules->begin();
+            it != sub_hw_modules->end(); it++) {
+        struct sensors_module_t *module = (struct sensors_module_t*) *it;
+        global_sensors_count += module->get_sensors_list(module, &subhal_sensors_list);
+        ALOGV("increased global_sensors_count to %d", global_sensors_count);
+    }
+
+    // The global_sensors_list is full of consts.
+    // Manipulate this non-const list, and point the const one to it when we're done.
+    sensor_t* mutable_sensor_list = new sensor_t[global_sensors_count];
+
+    // index of the next sensor to set in mutable_sensor_list
+    int mutable_sensor_index = 0;
+    int module_index = 0;
+
+    for (std::vector<hw_module_t*>::iterator it = sub_hw_modules->begin();
+            it != sub_hw_modules->end(); it++) {
+        hw_module_t *hw_module = *it;
+        ALOGV("examine one module");
+        // Read the sub-module's sensor list.
+        struct sensors_module_t *module = (struct sensors_module_t*) hw_module;
+        int module_sensor_count = module->get_sensors_list(module, &subhal_sensors_list);
+        ALOGV("the module has %d sensors", module_sensor_count);
+
+        // Copy the HAL's sensor list into global_sensors_list,
+        // with the handle changed to be a global handle.
+        for (int i = 0; i < module_sensor_count; i++) {
+            ALOGV("examining one sensor");
+            const struct sensor_t *local_sensor = &subhal_sensors_list[i];
+            int local_handle = local_sensor->handle;
+            memcpy(&mutable_sensor_list[mutable_sensor_index], local_sensor,
+                sizeof(struct sensor_t));
+
+            // Overwrite the global version's handle with a global handle.
+            int global_handle = assign_global_handle(module_index, local_handle);
+
+            mutable_sensor_list[mutable_sensor_index].handle = global_handle;
+            ALOGI("module_index %d, local_handle %d, global_handle %d",
+                    module_index, local_handle, global_handle);
+
+            mutable_sensor_index++;
+        }
+        module_index++;
+    }
+    // Set the const static global_sensors_list to the mutable one allocated by this function.
+    global_sensors_list = mutable_sensor_list;
+
+    pthread_mutex_unlock(&init_sensors_mutex);
+    ALOGV("end lazy_init_sensors_list");
+}
+
+static int module__get_sensors_list(struct sensors_module_t* module,
+        struct sensor_t const** list) {
+    ALOGV("module__get_sensors_list start");
+    lazy_init_sensors_list();
+    *list = global_sensors_list;
+    ALOGV("global_sensors_count: %d", global_sensors_count);
+    for (int i = 0; i < global_sensors_count; i++) {
+        ALOGV("sensor type: %d", global_sensors_list[i].type);
+    }
+    return global_sensors_count;
+}
+
+static struct hw_module_methods_t sensors_module_methods = {
+    open : open_sensors
+};
+
+struct sensors_module_t HAL_MODULE_INFO_SYM = {
+    common :{
+        tag : HARDWARE_MODULE_TAG,
+        version_major : 1,
+        version_minor : 0,
+        id : SENSORS_HARDWARE_MODULE_ID,
+        name : "MultiHal Sensor Module",
+        author : "Google, Inc",
+        methods : &sensors_module_methods,
+        dso : NULL,
+        reserved : {0},
+    },
+    get_sensors_list : module__get_sensors_list
+};
+
+static int open_sensors(const struct hw_module_t* hw_module, const char* name,
+        struct hw_device_t** hw_device_out) {
+    ALOGI("open_sensors begin...");
+
+    lazy_init_modules();
+
+    // Create proxy device, to return later.
+    sensors_poll_context_t *dev = new sensors_poll_context_t();
+    memset(dev, 0, sizeof(sensors_poll_device_1_t));
+    dev->proxy_device.common.tag = HARDWARE_DEVICE_TAG;
+    dev->proxy_device.common.version = SENSORS_DEVICE_API_VERSION_1_0;
+    dev->proxy_device.common.module = const_cast<hw_module_t*>(hw_module);
+    dev->proxy_device.common.close = device__close;
+    dev->proxy_device.activate = device__activate;
+    dev->proxy_device.setDelay = device__setDelay;
+    dev->proxy_device.poll = device__poll;
+    dev->proxy_device.batch = device__batch;
+    dev->proxy_device.flush = device__flush;
+
+    dev->nextReadIndex = 0;
+
+    // Open() the subhal modules. Remember their devices in a vector parallel to sub_hw_modules.
+    for (std::vector<hw_module_t*>::iterator it = sub_hw_modules->begin();
+            it != sub_hw_modules->end(); it++) {
+        sensors_module_t *sensors_module = (sensors_module_t*) *it;
+        struct hw_device_t* sub_hw_device;
+        int sub_open_result = sensors_module->common.methods->open(*it, name, &sub_hw_device);
+        dev->addSubHwDevice(sub_hw_device);
+    }
+
+    // Prepare the output param and return
+    *hw_device_out = &dev->proxy_device.common;
+    ALOGI("...open_sensors end");
+    return 0;
+}