diff --git a/modules/radio/Android.mk b/modules/radio/Android.mk
new file mode 100644
index 0000000..f433c85
--- /dev/null
+++ b/modules/radio/Android.mk
@@ -0,0 +1,27 @@
+# Copyright (C) 2015 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.
+
+LOCAL_PATH := $(call my-dir)
+
+# Stub radio HAL module, used for tests
+include $(CLEAR_VARS)
+
+LOCAL_MODULE := radio.fm.default
+LOCAL_MODULE_RELATIVE_PATH := hw
+LOCAL_SRC_FILES := radio_hw.c
+LOCAL_SHARED_LIBRARIES := liblog libcutils libradio_metadata
+LOCAL_MODULE_TAGS := optional
+LOCAL_32_BIT_ONLY := true
+
+include $(BUILD_SHARED_LIBRARY)
diff --git a/modules/radio/radio_hw.c b/modules/radio/radio_hw.c
new file mode 100644
index 0000000..b1a4d26
--- /dev/null
+++ b/modules/radio/radio_hw.c
@@ -0,0 +1,726 @@
+/*
+ * Copyright (C) 2015 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.
+ */
+
+#define LOG_TAG "radio_hw_stub"
+#define LOG_NDEBUG 0
+
+#include <string.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <pthread.h>
+#include <sys/prctl.h>
+#include <sys/time.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <cutils/log.h>
+#include <cutils/list.h>
+#include <system/radio.h>
+#include <system/radio_metadata.h>
+#include <hardware/hardware.h>
+#include <hardware/radio.h>
+
+static const radio_hal_properties_t hw_properties = {
+    .class_id = RADIO_CLASS_AM_FM,
+    .implementor = "The Android Open Source Project",
+    .product = "Radio stub HAL",
+    .version = "0.1",
+    .serial = "0123456789",
+    .num_tuners = 1,
+    .num_audio_sources = 1,
+    .supports_capture = false,
+    .num_bands = 2,
+    .bands = {
+        {
+            .type = RADIO_BAND_FM,
+            .antenna_connected = false,
+            .lower_limit = 87900,
+            .upper_limit = 107900,
+            .num_spacings = 1,
+            .spacings = { 200 },
+            .fm = {
+                .deemphasis = RADIO_DEEMPHASIS_75,
+                .stereo = true,
+                .rds = RADIO_RDS_US,
+                .ta = false,
+                .af = false,
+            }
+        },
+        {
+            .type = RADIO_BAND_AM,
+            .antenna_connected = true,
+            .lower_limit = 540,
+            .upper_limit = 1610,
+            .num_spacings = 1,
+            .spacings = { 10 },
+            .am = {
+                .stereo = true,
+            }
+        }
+    }
+};
+
+struct stub_radio_tuner {
+    struct radio_tuner interface;
+    struct stub_radio_device *dev;
+    radio_callback_t callback;
+    void *cookie;
+    radio_hal_band_config_t config;
+    radio_program_info_t program;
+    bool audio;
+    pthread_t callback_thread;
+    pthread_mutex_t lock;
+    pthread_cond_t  cond;
+    struct listnode command_list;
+};
+
+struct stub_radio_device {
+    struct radio_hw_device device;
+    struct stub_radio_tuner *tuner;
+    pthread_mutex_t lock;
+};
+
+
+typedef enum {
+    CMD_EXIT,
+    CMD_CONFIG,
+    CMD_STEP,
+    CMD_SCAN,
+    CMD_TUNE,
+    CMD_CANCEL,
+    CMD_METADATA,
+} thread_cmd_type_t;
+
+struct thread_command {
+    struct listnode node;
+    thread_cmd_type_t type;
+    struct timespec ts;
+    union {
+        unsigned int param;
+        radio_hal_band_config_t config;
+    };
+};
+
+/* must be called with out->lock locked */
+static int send_command_l(struct stub_radio_tuner *tuner,
+                          thread_cmd_type_t type,
+                          unsigned int delay_ms,
+                          void *param)
+{
+    struct thread_command *cmd = (struct thread_command *)calloc(1, sizeof(struct thread_command));
+    struct timespec ts;
+
+    if (cmd == NULL)
+        return -ENOMEM;
+
+    ALOGV("%s %d delay_ms %d", __func__, type, delay_ms);
+
+    cmd->type = type;
+    if (param != NULL) {
+        if (cmd->type == CMD_CONFIG) {
+            cmd->config = *(radio_hal_band_config_t *)param;
+            ALOGV("%s CMD_CONFIG type %d", __func__, cmd->config.type);
+        } else
+            cmd->param = *(unsigned int *)param;
+    }
+
+    clock_gettime(CLOCK_REALTIME, &ts);
+
+    ts.tv_sec  += delay_ms/1000;
+    ts.tv_nsec += (delay_ms%1000) * 1000000;
+    if (ts.tv_nsec >= 1000000000) {
+        ts.tv_nsec -= 1000000000;
+        ts.tv_sec  += 1;
+    }
+    cmd->ts = ts;
+    list_add_tail(&tuner->command_list, &cmd->node);
+    pthread_cond_signal(&tuner->cond);
+    return 0;
+}
+
+#define BITMAP_FILE_PATH "/data/misc/media/android.png"
+
+static int add_bitmap_metadata(radio_metadata_t **metadata, radio_metadata_key_t key,
+                               const char *source)
+{
+    int fd;
+    ssize_t ret = 0;
+    struct stat info;
+    void *data = NULL;
+    size_t size;
+
+    fd = open(source, O_RDONLY);
+    if (fd < 0)
+        return -EPIPE;
+
+    fstat(fd, &info);
+    size = info.st_size;
+    data = malloc(size);
+    if (data == NULL) {
+        ret = -ENOMEM;
+        goto exit;
+    }
+    ret = read(fd, data, size);
+    if (ret < 0)
+        goto exit;
+    ret = radio_metadata_add_raw(metadata, key, (const unsigned char *)data, size);
+
+exit:
+    close(fd);
+    free(data);
+    ALOGE_IF(ret != 0, "%s error %d", __func__, ret);
+    return (int)ret;
+}
+
+static int prepare_metadata(struct stub_radio_tuner *tuner,
+                            radio_metadata_t **metadata, bool program)
+{
+    int ret = 0;
+    char text[RADIO_STRING_LEN_MAX];
+    struct timespec ts;
+
+    if (metadata == NULL)
+        return -EINVAL;
+
+    if (*metadata != NULL)
+        radio_metadata_deallocate(*metadata);
+
+    *metadata = NULL;
+
+    ret = radio_metadata_allocate(metadata, tuner->program.channel, 0);
+    if (ret != 0)
+        return ret;
+
+    if (program) {
+        ret = radio_metadata_add_int(metadata, RADIO_METADATA_KEY_RBDS_PTY, 5);
+        if (ret != 0)
+            goto exit;
+        ret = radio_metadata_add_text(metadata, RADIO_METADATA_KEY_RDS_PS, "RockBand");
+        if (ret != 0)
+            goto exit;
+        ret = add_bitmap_metadata(metadata, RADIO_METADATA_KEY_ICON, BITMAP_FILE_PATH);
+        if (ret != 0)
+            goto exit;
+    } else {
+        ret = add_bitmap_metadata(metadata, RADIO_METADATA_KEY_ART, BITMAP_FILE_PATH);
+        if (ret != 0)
+            goto exit;
+    }
+
+    clock_gettime(CLOCK_REALTIME, &ts);
+    snprintf(text, RADIO_STRING_LEN_MAX, "Artist %ld", ts.tv_sec % 10);
+    ret = radio_metadata_add_text(metadata, RADIO_METADATA_KEY_ARTIST, text);
+    if (ret != 0)
+        goto exit;
+
+    snprintf(text, RADIO_STRING_LEN_MAX, "Song %ld", ts.tv_nsec % 10);
+    ret = radio_metadata_add_text(metadata, RADIO_METADATA_KEY_TITLE, text);
+    if (ret != 0)
+        goto exit;
+
+    return 0;
+
+exit:
+    radio_metadata_deallocate(*metadata);
+    *metadata = NULL;
+    return ret;
+}
+
+static void *callback_thread_loop(void *context)
+{
+    struct stub_radio_tuner *tuner = (struct stub_radio_tuner *)context;
+    struct timespec ts = {0, 0};
+
+    ALOGI("%s", __func__);
+
+    prctl(PR_SET_NAME, (unsigned long)"sound trigger callback", 0, 0, 0);
+
+    pthread_mutex_lock(&tuner->lock);
+
+    while (true) {
+        struct thread_command *cmd = NULL;
+        struct listnode *item;
+        struct listnode *tmp;
+        struct timespec cur_ts;
+
+        if (list_empty(&tuner->command_list) || ts.tv_sec != 0) {
+            ALOGV("%s SLEEPING", __func__);
+            if (ts.tv_sec != 0) {
+                ALOGV("%s SLEEPING with timeout", __func__);
+                pthread_cond_timedwait(&tuner->cond, &tuner->lock, &ts);
+            } else {
+                ALOGV("%s SLEEPING forever", __func__);
+                pthread_cond_wait(&tuner->cond, &tuner->lock);
+            }
+            ts.tv_sec = 0;
+            ALOGV("%s RUNNING", __func__);
+        }
+
+        clock_gettime(CLOCK_REALTIME, &cur_ts);
+
+        list_for_each_safe(item, tmp, &tuner->command_list) {
+            cmd = node_to_item(item, struct thread_command, node);
+
+            if ((cmd->ts.tv_sec < cur_ts.tv_sec) ||
+                    ((cmd->ts.tv_sec == cur_ts.tv_sec) && (cmd->ts.tv_nsec < cur_ts.tv_nsec))) {
+                radio_hal_event_t event;
+
+                event.type = RADIO_EVENT_HW_FAILURE;
+                list_remove(item);
+
+                ALOGV("%s processing command %d time %ld.%ld", __func__, cmd->type, cmd->ts.tv_sec,
+                      cmd->ts.tv_nsec);
+
+                switch (cmd->type) {
+                default:
+                case CMD_EXIT:
+                    free(cmd);
+                    goto exit;
+
+                case CMD_CONFIG: {
+                    tuner->config = cmd->config;
+                    event.type = RADIO_EVENT_CONFIG;
+                    event.config = tuner->config;
+                    ALOGV("%s CMD_CONFIG type %d low %d up %d",
+                          __func__, tuner->config.type,
+                          tuner->config.lower_limit, tuner->config.upper_limit);
+                    if (tuner->config.type == RADIO_BAND_FM) {
+                        ALOGV("  - stereo %d\n  - rds %d\n  - ta %d\n  - af %d",
+                              tuner->config.fm.stereo, tuner->config.fm.rds,
+                              tuner->config.fm.ta, tuner->config.fm.af);
+                    } else {
+                        ALOGV("  - stereo %d", tuner->config.am.stereo);
+                    }
+                } break;
+
+                case CMD_STEP: {
+                    int frequency;
+                    frequency = tuner->program.channel;
+                    if (cmd->param == RADIO_DIRECTION_UP) {
+                        frequency += tuner->config.spacings[0];
+                    } else {
+                        frequency -= tuner->config.spacings[0];
+                    }
+                    if (frequency > (int)tuner->config.upper_limit) {
+                        frequency = tuner->config.lower_limit;
+                    }
+                    if (frequency < (int)tuner->config.lower_limit) {
+                        frequency = tuner->config.upper_limit;
+                    }
+                    tuner->program.channel = frequency;
+                    tuner->program.tuned  = (frequency / (tuner->config.spacings[0] * 5)) % 2;
+                    tuner->program.signal_strength = 20;
+                    if (tuner->config.type == RADIO_BAND_FM)
+                        tuner->program.stereo = false;
+                    else
+                        tuner->program.stereo = false;
+
+                    event.type = RADIO_EVENT_TUNED;
+                    event.info = tuner->program;
+                } break;
+
+                case CMD_SCAN: {
+                    int frequency;
+                    frequency = tuner->program.channel;
+                    if (cmd->param == RADIO_DIRECTION_UP) {
+                        frequency += tuner->config.spacings[0] * 25;
+                    } else {
+                        frequency -= tuner->config.spacings[0] * 25;
+                    }
+                    if (frequency > (int)tuner->config.upper_limit) {
+                        frequency = tuner->config.lower_limit;
+                    }
+                    if (frequency < (int)tuner->config.lower_limit) {
+                        frequency = tuner->config.upper_limit;
+                    }
+                    tuner->program.channel = (unsigned int)frequency;
+                    tuner->program.tuned  = true;
+                    if (tuner->config.type == RADIO_BAND_FM)
+                        tuner->program.stereo = tuner->config.fm.stereo;
+                    else
+                        tuner->program.stereo = tuner->config.am.stereo;
+                    tuner->program.signal_strength = 50;
+
+                    event.type = RADIO_EVENT_TUNED;
+                    event.info = tuner->program;
+                    if (tuner->program.metadata != NULL)
+                        radio_metadata_deallocate(tuner->program.metadata);
+                    tuner->program.metadata = NULL;
+                    send_command_l(tuner, CMD_METADATA, 2000, NULL);
+                } break;
+
+                case CMD_TUNE: {
+                    tuner->program.channel = cmd->param;
+                    tuner->program.tuned  = (tuner->program.channel /
+                                                (tuner->config.spacings[0] * 5)) % 2;
+
+                    if (tuner->program.tuned) {
+                        prepare_metadata(tuner, &tuner->program.metadata, true);
+                        send_command_l(tuner, CMD_METADATA, 5000, NULL);
+                    } else {
+                        if (tuner->program.metadata != NULL)
+                            radio_metadata_deallocate(tuner->program.metadata);
+                        tuner->program.metadata = NULL;
+                    }
+                    tuner->program.signal_strength = 100;
+                    if (tuner->config.type == RADIO_BAND_FM)
+                        tuner->program.stereo =
+                                tuner->program.tuned ? tuner->config.fm.stereo : false;
+                    else
+                        tuner->program.stereo =
+                            tuner->program.tuned ? tuner->config.am.stereo : false;
+                    event.type = RADIO_EVENT_TUNED;
+                    event.info = tuner->program;
+                } break;
+
+                case CMD_METADATA: {
+                    prepare_metadata(tuner, &tuner->program.metadata, false);
+                    event.type = RADIO_EVENT_METADATA;
+                    event.metadata = tuner->program.metadata;
+                } break;
+
+                case CMD_CANCEL: {
+                    struct listnode *tmp2;
+                    list_for_each_safe(item, tmp2, &tuner->command_list) {
+                        cmd = node_to_item(item, struct thread_command, node);
+                        if (cmd->type == CMD_STEP || cmd->type == CMD_SCAN ||
+                                cmd->type == CMD_TUNE || cmd->type == CMD_METADATA) {
+                            list_remove(item);
+                            free(cmd);
+                        }
+                    }
+                } break;
+
+                }
+                if (event.type != RADIO_EVENT_HW_FAILURE && tuner->callback != NULL) {
+                    pthread_mutex_unlock(&tuner->lock);
+                    tuner->callback(&event, tuner->cookie);
+                    pthread_mutex_lock(&tuner->lock);
+                }
+                ALOGV("%s processed command %d", __func__, cmd->type);
+                free(cmd);
+            } else {
+                if ((ts.tv_sec == 0) ||
+                        (cmd->ts.tv_sec < ts.tv_sec) ||
+                        ((cmd->ts.tv_sec == ts.tv_sec) && (cmd->ts.tv_nsec < ts.tv_nsec))) {
+                    ts.tv_sec = cmd->ts.tv_sec;
+                    ts.tv_nsec = cmd->ts.tv_nsec;
+                }
+            }
+        }
+    }
+
+exit:
+    pthread_mutex_unlock(&tuner->lock);
+
+    ALOGV("%s Exiting", __func__);
+
+    return NULL;
+}
+
+
+static int tuner_set_configuration(const struct radio_tuner *tuner,
+                         const radio_hal_band_config_t *config)
+{
+    struct stub_radio_tuner *stub_tuner = (struct stub_radio_tuner *)tuner;
+    int status = 0;
+
+    ALOGI("%s stub_tuner %p", __func__, stub_tuner);
+    pthread_mutex_lock(&stub_tuner->lock);
+    if (config == NULL) {
+        status = -EINVAL;
+        goto exit;
+    }
+    send_command_l(stub_tuner, CMD_CANCEL, 0, NULL);
+    send_command_l(stub_tuner, CMD_CONFIG, 500, (void *)config);
+
+exit:
+    pthread_mutex_unlock(&stub_tuner->lock);
+    return status;
+}
+
+static int tuner_get_configuration(const struct radio_tuner *tuner,
+                         radio_hal_band_config_t *config)
+{
+    struct stub_radio_tuner *stub_tuner = (struct stub_radio_tuner *)tuner;
+    int status = 0;
+    struct listnode *item;
+    radio_hal_band_config_t *src_config;
+
+    ALOGI("%s stub_tuner %p", __func__, stub_tuner);
+    pthread_mutex_lock(&stub_tuner->lock);
+    src_config = &stub_tuner->config;
+
+    if (config == NULL) {
+        status = -EINVAL;
+        goto exit;
+    }
+    list_for_each(item, &stub_tuner->command_list) {
+        struct thread_command *cmd = node_to_item(item, struct thread_command, node);
+        if (cmd->type == CMD_CONFIG) {
+            src_config = &cmd->config;
+        }
+    }
+    *config = *src_config;
+
+exit:
+    pthread_mutex_unlock(&stub_tuner->lock);
+    return status;
+}
+
+static int tuner_step(const struct radio_tuner *tuner,
+                     radio_direction_t direction, bool skip_sub_channel)
+{
+    struct stub_radio_tuner *stub_tuner = (struct stub_radio_tuner *)tuner;
+
+    ALOGI("%s stub_tuner %p direction %d, skip_sub_channel %d",
+          __func__, stub_tuner, direction, skip_sub_channel);
+
+    pthread_mutex_lock(&stub_tuner->lock);
+    send_command_l(stub_tuner, CMD_STEP, 20, &direction);
+    pthread_mutex_unlock(&stub_tuner->lock);
+    return 0;
+}
+
+static int tuner_scan(const struct radio_tuner *tuner,
+                     radio_direction_t direction, bool skip_sub_channel)
+{
+    struct stub_radio_tuner *stub_tuner = (struct stub_radio_tuner *)tuner;
+
+    ALOGI("%s stub_tuner %p direction %d, skip_sub_channel %d",
+          __func__, stub_tuner, direction, skip_sub_channel);
+
+    pthread_mutex_lock(&stub_tuner->lock);
+    send_command_l(stub_tuner, CMD_SCAN, 200, &direction);
+    pthread_mutex_unlock(&stub_tuner->lock);
+    return 0;
+}
+
+static int tuner_tune(const struct radio_tuner *tuner,
+                     unsigned int channel, unsigned int sub_channel)
+{
+    struct stub_radio_tuner *stub_tuner = (struct stub_radio_tuner *)tuner;
+
+    ALOGI("%s stub_tuner %p channel %d, sub_channel %d",
+          __func__, stub_tuner, channel, sub_channel);
+
+    pthread_mutex_lock(&stub_tuner->lock);
+    if (channel < stub_tuner->config.lower_limit || channel > stub_tuner->config.upper_limit) {
+        pthread_mutex_unlock(&stub_tuner->lock);
+        ALOGI("%s channel out of range", __func__);
+        return -EINVAL;
+    }
+    send_command_l(stub_tuner, CMD_TUNE, 100, &channel);
+    pthread_mutex_unlock(&stub_tuner->lock);
+    return 0;
+}
+
+static int tuner_cancel(const struct radio_tuner *tuner)
+{
+    struct stub_radio_tuner *stub_tuner = (struct stub_radio_tuner *)tuner;
+
+    ALOGI("%s stub_tuner %p", __func__, stub_tuner);
+
+    pthread_mutex_lock(&stub_tuner->lock);
+    send_command_l(stub_tuner, CMD_CANCEL, 0, NULL);
+    pthread_mutex_unlock(&stub_tuner->lock);
+    return 0;
+}
+
+static int tuner_get_program_information(const struct radio_tuner *tuner,
+                                        radio_program_info_t *info)
+{
+    struct stub_radio_tuner *stub_tuner = (struct stub_radio_tuner *)tuner;
+    int status = 0;
+    radio_metadata_t *metadata;
+
+    ALOGI("%s stub_tuner %p", __func__, stub_tuner);
+    pthread_mutex_lock(&stub_tuner->lock);
+    if (info == NULL) {
+        status = -EINVAL;
+        goto exit;
+    }
+    metadata = info->metadata;
+    *info = stub_tuner->program;
+    info->metadata = metadata;
+    if (metadata != NULL)
+        radio_metadata_add_metadata(&info->metadata, stub_tuner->program.metadata);
+
+exit:
+    pthread_mutex_unlock(&stub_tuner->lock);
+    return status;
+}
+
+static int rdev_get_properties(const struct radio_hw_device *dev,
+                                radio_hal_properties_t *properties)
+{
+    struct stub_radio_device *rdev = (struct stub_radio_device *)dev;
+
+    ALOGI("%s", __func__);
+    if (properties == NULL)
+        return -EINVAL;
+    memcpy(properties, &hw_properties, sizeof(radio_hal_properties_t));
+    return 0;
+}
+
+static int rdev_open_tuner(const struct radio_hw_device *dev,
+                          const radio_hal_band_config_t *config,
+                          bool audio,
+                          radio_callback_t callback,
+                          void *cookie,
+                          const struct radio_tuner **tuner)
+{
+    struct stub_radio_device *rdev = (struct stub_radio_device *)dev;
+    int status = 0;
+
+    ALOGI("%s rdev %p", __func__, rdev);
+    pthread_mutex_lock(&rdev->lock);
+
+    if (rdev->tuner != NULL) {
+        status = -ENOSYS;
+        goto exit;
+    }
+
+    if (config == NULL || callback == NULL || tuner == NULL) {
+        status = -EINVAL;
+        goto exit;
+    }
+
+    rdev->tuner = (struct stub_radio_tuner *)calloc(1, sizeof(struct stub_radio_tuner));
+    if (rdev->tuner == NULL) {
+        status = -ENOMEM;
+        goto exit;
+    }
+
+    rdev->tuner->interface.set_configuration = tuner_set_configuration;
+    rdev->tuner->interface.get_configuration = tuner_get_configuration;
+    rdev->tuner->interface.scan = tuner_scan;
+    rdev->tuner->interface.step = tuner_step;
+    rdev->tuner->interface.tune = tuner_tune;
+    rdev->tuner->interface.cancel = tuner_cancel;
+    rdev->tuner->interface.get_program_information = tuner_get_program_information;
+
+    rdev->tuner->audio = audio;
+    rdev->tuner->callback = callback;
+    rdev->tuner->cookie = cookie;
+
+    rdev->tuner->dev = rdev;
+
+    pthread_mutex_init(&rdev->tuner->lock, (const pthread_mutexattr_t *) NULL);
+    pthread_cond_init(&rdev->tuner->cond, (const pthread_condattr_t *) NULL);
+    pthread_create(&rdev->tuner->callback_thread, (const pthread_attr_t *) NULL,
+                        callback_thread_loop, rdev->tuner);
+    list_init(&rdev->tuner->command_list);
+
+    pthread_mutex_lock(&rdev->tuner->lock);
+    send_command_l(rdev->tuner, CMD_CONFIG, 500, (void *)config);
+    pthread_mutex_unlock(&rdev->tuner->lock);
+
+    *tuner = &rdev->tuner->interface;
+
+exit:
+    pthread_mutex_unlock(&rdev->lock);
+    ALOGI("%s DONE", __func__);
+    return status;
+}
+
+static int rdev_close_tuner(const struct radio_hw_device *dev,
+                            const struct radio_tuner *tuner)
+{
+    struct stub_radio_device *rdev = (struct stub_radio_device *)dev;
+    struct stub_radio_tuner *stub_tuner = (struct stub_radio_tuner *)tuner;
+    int status = 0;
+
+    ALOGI("%s tuner %p", __func__, tuner);
+    pthread_mutex_lock(&rdev->lock);
+
+    if (tuner == NULL) {
+        status = -EINVAL;
+        goto exit;
+    }
+
+    pthread_mutex_lock(&stub_tuner->lock);
+    stub_tuner->callback = NULL;
+    send_command_l(stub_tuner, CMD_EXIT, 0, NULL);
+    pthread_mutex_unlock(&stub_tuner->lock);
+    pthread_join(stub_tuner->callback_thread, (void **) NULL);
+
+    if (stub_tuner->program.metadata != NULL)
+        radio_metadata_deallocate(stub_tuner->program.metadata);
+
+    free(stub_tuner);
+    rdev->tuner = NULL;
+
+exit:
+    pthread_mutex_unlock(&rdev->lock);
+    return status;
+}
+
+static int rdev_close(hw_device_t *device)
+{
+    struct stub_radio_device *rdev = (struct stub_radio_device *)device;
+    if (rdev != NULL) {
+        free(rdev->tuner);
+    }
+    free(rdev);
+    return 0;
+}
+
+static int rdev_open(const hw_module_t* module, const char* name,
+                     hw_device_t** device)
+{
+    struct stub_radio_device *rdev;
+    int ret;
+
+    if (strcmp(name, RADIO_HARDWARE_DEVICE) != 0)
+        return -EINVAL;
+
+    rdev = calloc(1, sizeof(struct stub_radio_device));
+    if (!rdev)
+        return -ENOMEM;
+
+    rdev->device.common.tag = HARDWARE_DEVICE_TAG;
+    rdev->device.common.version = RADIO_DEVICE_API_VERSION_1_0;
+    rdev->device.common.module = (struct hw_module_t *) module;
+    rdev->device.common.close = rdev_close;
+    rdev->device.get_properties = rdev_get_properties;
+    rdev->device.open_tuner = rdev_open_tuner;
+    rdev->device.close_tuner = rdev_close_tuner;
+
+    pthread_mutex_init(&rdev->lock, (const pthread_mutexattr_t *) NULL);
+
+    *device = &rdev->device.common;
+
+    return 0;
+}
+
+
+static struct hw_module_methods_t hal_module_methods = {
+    .open = rdev_open,
+};
+
+struct radio_module HAL_MODULE_INFO_SYM = {
+    .common = {
+        .tag = HARDWARE_MODULE_TAG,
+        .module_api_version = RADIO_MODULE_API_VERSION_1_0,
+        .hal_api_version = HARDWARE_HAL_API_VERSION,
+        .id = RADIO_HARDWARE_MODULE_ID,
+        .name = "Stub radio HAL",
+        .author = "The Android Open Source Project",
+        .methods = &hal_module_methods,
+    },
+};