Add fingerprint HAL into goldfish device

This is to provide minimal fingerprint support in SDK system
images. It provides functions to enroll and process fingerprint.

For fingerprint emulation to work, additionally, the emulator need
to implement the fingerprint module that gets user inputs (touching
fingerprint sensor and removing finger from it) and sends those
inputs to the guest system.

Change-Id: Ifc97b8a9bd5ffdcb465994f4a8f9004b4ce73f64

2 files changed, 256 insertions, 0 deletions

diff --git a/fingerprint/Android.mk b/fingerprint/Android.mk
new file mode 100644
index 0000000..f4b76c9
--- /dev/null
+++ b/fingerprint/Android.mk
@@ -0,0 +1,33 @@
+# 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.
+
+LOCAL_PATH := $(call my-dir)
+
+include $(CLEAR_VARS)
+
+LOCAL_MODULE := fingerprint.goldfish
+LOCAL_MODULE_RELATIVE_PATH := hw
+LOCAL_SRC_FILES := fingerprint.c
+LOCAL_SHARED_LIBRARIES := liblog
+
+include $(BUILD_SHARED_LIBRARY)
+
+include $(CLEAR_VARS)
+
+LOCAL_MODULE := fingerprint.ranchu
+LOCAL_MODULE_RELATIVE_PATH := hw
+LOCAL_SRC_FILES := fingerprint.c
+LOCAL_SHARED_LIBRARIES := liblog
+
+include $(BUILD_SHARED_LIBRARY)
diff --git a/fingerprint/fingerprint.c b/fingerprint/fingerprint.c
new file mode 100644
index 0000000..48cddd8
--- /dev/null
+++ b/fingerprint/fingerprint.c
@@ -0,0 +1,223 @@
+/*
+ * 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  FINGERPRINT_LISTEN_SERVICE_NAME "fingerprintlisten"
+
+#define LOG_TAG "FingerprintHal"
+
+#include <errno.h>
+#include <malloc.h>
+#include <string.h>
+#include <cutils/log.h>
+#include <hardware/hardware.h>
+#include <hardware/fingerprint.h>
+#include <hardware/qemud.h>
+
+typedef enum worker_state_t {
+    STATE_ENROLL = 1,
+    STATE_SCAN = 2,
+    STATE_EXIT = 3
+} worker_state_t;
+
+typedef struct worker_thread_t {
+    pthread_t thread;
+    pthread_mutex_t mutex;
+    int request;
+    worker_state_t state;
+    int fingerid;
+    int finger_is_on;
+} worker_thread_t;
+
+typedef struct emu_fingerprint_hal_device_t {
+    fingerprint_device_t device; //inheritance
+    worker_thread_t listener;
+    pthread_mutex_t lock;
+} emu_fingerprint_hal_device_t;
+
+
+static void destroyListenerThread(emu_fingerprint_hal_device_t* dev)
+{
+    pthread_join(dev->listener.thread, NULL);
+    pthread_mutex_destroy(&dev->listener.mutex);
+}
+
+static void listener_send_notice(emu_fingerprint_hal_device_t* dev)
+{
+    fingerprint_msg_t message;
+    pthread_mutex_lock(&dev->listener.mutex);
+    if (dev->listener.state == STATE_ENROLL) {
+        message.type = FINGERPRINT_TEMPLATE_ENROLLING;
+        message.data.enroll.finger.fid = dev->listener.fingerid;
+        message.data.enroll.samples_remaining = 0;
+        dev->listener.state = STATE_SCAN;
+    } else {
+        message.type = FINGERPRINT_PROCESSED;
+        message.data.processed.finger.gid = 0;
+        message.data.processed.finger.fid = dev->listener.fingerid;
+    }
+    pthread_mutex_unlock(&dev->listener.mutex);
+
+    pthread_mutex_lock(&dev->lock);
+    dev->device.notify(message);
+    pthread_mutex_unlock(&dev->lock);
+}
+
+static void* listenerFunction(void* data)
+{
+    emu_fingerprint_hal_device_t* dev = (emu_fingerprint_hal_device_t*) data;
+
+    int fd = qemud_channel_open(FINGERPRINT_LISTEN_SERVICE_NAME);
+    if (fd < 0) {
+        ALOGE("listener cannot open fingerprint listener service exit");
+        return NULL;
+    }
+
+    const char* cmd = "listen";
+    if (qemud_channel_send(fd, cmd, strlen(cmd)) < 0) {
+        ALOGE("cannot write fingerprint 'listen' to host");
+        return NULL;
+    }
+
+    char buffer[128];
+    int fingerid=-1;
+    int size;
+    while (1) {
+        //simply listen in blocking mode
+        if ((size = qemud_channel_recv(fd, buffer, sizeof buffer - 1)) >0) {
+            buffer[size] = '\0';
+            if (sscanf(buffer, "on:%d", &fingerid) == 1) {
+                dev->listener.fingerid = fingerid;
+                dev->listener.finger_is_on = 1;
+                ALOGD("got finger %d", fingerid);
+                listener_send_notice(dev);
+                ALOGD("send notice finger %d", fingerid);
+            } else if (strncmp("off", buffer, 3) == 0) {
+                dev->listener.finger_is_on = 0;
+                ALOGD("finger off", fingerid);
+            } else {
+                ALOGE("error: '%s'", buffer);
+            }
+        } else {
+            ALOGE("receive failure");
+            // return NULL;
+        }
+        //TODO: check for request to exit thread
+    }
+
+    ALOGD("listener exit");
+    return NULL;
+}
+
+static void createListenerThread(emu_fingerprint_hal_device_t* dev)
+{
+    pthread_mutex_init(&dev->listener.mutex, NULL);
+    pthread_create(&dev->listener.thread, NULL, listenerFunction, dev);
+}
+
+static int fingerprint_close(hw_device_t *dev)
+{
+    if (dev) {
+        free(dev);
+        destroyListenerThread(dev);
+        return 0;
+    } else {
+        return -1;
+    }
+}
+
+static void setListenerState(emu_fingerprint_hal_device_t* dev, worker_state_t state) {
+    pthread_mutex_lock(&dev->listener.mutex);
+    dev->listener.state = state;
+    pthread_mutex_unlock(&dev->listener.mutex);
+}
+
+static int fingerprint_enroll(struct fingerprint_device __unused *device,
+                                uint32_t __unused timeout_sec) {
+    ALOGE("fingerpring_enroll");
+    emu_fingerprint_hal_device_t* dev = (emu_fingerprint_hal_device_t*) device;
+    setListenerState(dev, STATE_ENROLL);
+    return 0;
+
+}
+
+static int fingerprint_enroll_cancel(struct fingerprint_device __unused *device,
+                                uint32_t __unused timeout_sec) {
+    ALOGE("fingerpring_enroll_cancel");
+    emu_fingerprint_hal_device_t* dev = (emu_fingerprint_hal_device_t*) device;
+    setListenerState(dev, STATE_SCAN);
+    return 0;
+}
+
+static int fingerprint_remove(struct fingerprint_device __unused *dev,
+                                uint32_t __unused fingerprint_id) {
+    return FINGERPRINT_ERROR;
+}
+
+static int set_notify_callback(struct fingerprint_device *device,
+                                fingerprint_notify_t notify) {
+    ALOGD("set_notify");
+    emu_fingerprint_hal_device_t* dev =(emu_fingerprint_hal_device_t*) device;
+    pthread_mutex_lock(&dev->lock);
+    device->notify = notify;
+    pthread_mutex_unlock(&dev->lock);
+    return 0;
+}
+
+static int fingerprint_open(const hw_module_t* module, const char __unused *id,
+                            hw_device_t** device)
+{
+    if (device == NULL) {
+        ALOGE("NULL device on open");
+        return -EINVAL;
+    } else {
+        ALOGE("fingerprint open\n");
+    }
+
+    emu_fingerprint_hal_device_t *dev = malloc(sizeof(emu_fingerprint_hal_device_t));
+    memset(dev, 0, sizeof(emu_fingerprint_hal_device_t));
+
+    dev->device.common.tag = HARDWARE_DEVICE_TAG;
+    dev->device.common.version = HARDWARE_MODULE_API_VERSION(2, 0);
+    dev->device.common.module = (struct hw_module_t*) module;
+    dev->device.common.close = fingerprint_close;
+
+    dev->device.enroll = fingerprint_enroll;
+    dev->device.enroll_cancel = fingerprint_enroll_cancel;
+    dev->device.remove = fingerprint_remove;
+    dev->device.set_notify = set_notify_callback;
+    dev->device.notify = NULL;
+
+    pthread_mutex_init(&dev->lock, NULL);
+    createListenerThread(dev);
+    *device = (hw_device_t*) dev;
+    return 0;
+}
+
+static struct hw_module_methods_t fingerprint_module_methods = {
+    .open = fingerprint_open,
+};
+
+fingerprint_module_t HAL_MODULE_INFO_SYM = {
+    .common = {
+        .tag                = HARDWARE_MODULE_TAG,
+        .module_api_version = FINGERPRINT_MODULE_API_VERSION_1_0,
+        .hal_api_version    = HARDWARE_HAL_API_VERSION,
+        .id                 = FINGERPRINT_HARDWARE_MODULE_ID,
+        .name               = "Emulator Fingerprint HAL",
+        .author             = "The Android Open Source Project",
+        .methods            = &fingerprint_module_methods,
+    },
+};