moved to device/samsung/aries-common

4 files changed, 2388 insertions, 0 deletions

diff --git a/liboverlay/Android.mk b/liboverlay/Android.mk
new file mode 100644
index 0000000..c4de48c
--- /dev/null
+++ b/liboverlay/Android.mk
@@ -0,0 +1,35 @@
+# 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.
+
+LOCAL_PATH:= $(call my-dir)
+# HAL module implemenation, not prelinked and stored in
+# hw/<COPYPIX_HARDWARE_MODULE_ID>.<ro.product.board>.so
+
+include $(CLEAR_VARS)
+LOCAL_PRELINK_MODULE := false
+LOCAL_MODULE_PATH := $(TARGET_OUT_SHARED_LIBRARIES)/hw
+LOCAL_SHARED_LIBRARIES := liblog libcutils
+
+ifdef BOARD_V4L2_DEVICE
+    LOCAL_CFLAGS += -DV4L2_DEVICE=\"$(BOARD_V4L2_DEVICE)\"
+endif
+
+LOCAL_C_INCLUDES := \
+    $(LOCAL_PATH)/../include
+
+LOCAL_SRC_FILES := v4l2_utils.c overlay.cpp
+
+LOCAL_MODULE := overlay.aries
+LOCAL_MODULE_TAGS := optional
+include $(BUILD_SHARED_LIBRARY)
diff --git a/liboverlay/overlay.cpp b/liboverlay/overlay.cpp
new file mode 100644
index 0000000..d0a4289
--- /dev/null
+++ b/liboverlay/overlay.cpp
@@ -0,0 +1,1490 @@
+/*
+ * 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.
+ */
+
+/*#define LOG_NDEBUG 0*/
+#define LOG_TAG "SEC_Overlay"
+
+#include <hardware/hardware.h>
+#include <hardware/overlay.h>
+
+extern "C" {
+#include "v4l2_utils.h"
+}
+
+#include <pthread.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/mman.h>
+#include <unistd.h>
+#include <linux/videodev.h>
+
+#include <cutils/log.h>
+#include <cutils/ashmem.h>
+#include <cutils/atomic.h>
+
+#include "linux/fb.h"
+
+/*****************************************************************************/
+
+#define LOG_FUNCTION_NAME LOGV(" %s %s",  __FILE__, __func__)
+
+#define NUM_OVERLAY_BUFFERS_REQUESTED  (3)
+/* OVRLYSHM on phone keypad*/
+#define SHARED_DATA_MARKER             (0x68759746)
+
+/* These values should come from Surface Flinger */
+unsigned int g_lcd_width = 480;
+unsigned int g_lcd_height = 800;
+unsigned int g_lcd_bpp = 32;
+
+#define CACHEABLE_BUFFERS 0x1
+
+/* shared with Camera/Video Playback HAL */
+#define ALL_BUFFERS_FLUSHED -66
+
+uint32_t phyAddr;
+s5p_fimc_t g_s5p_fimc;
+
+typedef struct
+{
+    uint32_t posX;
+    uint32_t posY;
+    uint32_t posW;
+    uint32_t posH;
+    uint32_t rotation;
+    uint32_t flip;
+
+    uint32_t posX_org;
+    uint32_t posY_org;
+    uint32_t posW_org;
+    uint32_t posH_org;
+
+} overlay_ctrl_t;
+
+typedef struct
+{
+    uint32_t cropX;
+    uint32_t cropY;
+    uint32_t cropW;
+    uint32_t cropH;
+} overlay_data_t;
+
+typedef struct
+{
+    uint32_t marker;
+    uint32_t size;
+
+    volatile int32_t refCnt;
+
+    uint32_t controlReady; /* Only updated by the control side */
+    uint32_t dataReady;    /* Only updated by the data side */
+
+    pthread_mutex_t lock;
+    pthread_mutexattr_t attr;
+
+    uint32_t streamEn;
+    uint32_t streamingReset;
+
+    uint32_t dispW;
+    uint32_t dispH;
+
+} overlay_shared_t;
+
+/* Only one instance is created per platform */
+struct overlay_control_context_t {
+    struct overlay_control_device_t device;
+    /* our private state goes below here */
+    struct overlay_t* overlay_video1;
+    struct overlay_t* overlay_video2;
+};
+
+/* A separate instance is created per overlay data side user*/
+struct overlay_data_context_t {
+    struct overlay_data_device_t device;
+    /* our private state goes below here */
+    int ctl_fd;
+    int shared_fd;
+    int shared_size;
+    int width;
+    int height;
+    int format;
+    int num_buffers;
+    size_t *buffers_len;
+    void **buffers;
+
+    overlay_data_t    data;
+    overlay_shared_t  *shared;
+    struct mapping_data    *mapping_data;
+    /* Need to count Qd buffers
+       to be sure we don't block DQ'ing when exiting */
+    int qd_buf_count;
+    int cacheable_buffers;
+
+    bool zerocopy;
+};
+
+static int  create_shared_data(overlay_shared_t **shared);
+static void destroy_shared_data(int shared_fd, overlay_shared_t *shared,
+                                bool closefd);
+static int  open_shared_data(overlay_data_context_t *ctx);
+static void close_shared_data(overlay_data_context_t *ctx);
+enum { LOCK_REQUIRED = 1, NO_LOCK_NEEDED = 0 };
+static int  enable_streaming(overlay_shared_t *shared, int ovly_fd,
+                             int lock_required );
+
+static int overlay_device_open(const struct hw_module_t* module,
+        const char* name, struct hw_device_t** device);
+
+static int check_fimc_dst_constraints(s5p_fimc_t *s5p_fimc,
+                                      unsigned int rotation);
+static int check_fimc_src_constraints(s5p_fimc_t *s5p_fimc);
+
+static struct hw_module_methods_t overlay_module_methods = {
+open: overlay_device_open
+};
+
+struct overlay_module_t HAL_MODULE_INFO_SYM = {
+common: {
+tag: HARDWARE_MODULE_TAG,
+     version_major: 1,
+     version_minor: 0,
+     id: OVERLAY_HARDWARE_MODULE_ID,
+     name: "SEC Overlay module",
+     author: "The Android Open Source Project",
+     methods: &overlay_module_methods,
+        }
+};
+
+/*****************************************************************************/
+
+/*
+ * This is the overlay_t object, it is returned to the user and represents
+ * an overlay. here we use a subclass, where we can store our own state.
+ * This handles will be passed across processes and possibly given to other
+ * HAL modules (for instance video decode modules).
+ */
+struct handle_t : public native_handle {
+    /* add the data fields we need here, for instance: */
+    int ctl_fd;
+    int shared_fd;
+    int width;
+    int height;
+    int format;
+    int num_buffers;
+    int shared_size;
+};
+
+static int handle_format(const overlay_handle_t overlay) {
+    return static_cast<const struct handle_t *>(overlay)->format;
+}
+
+static int handle_ctl_fd(const overlay_handle_t overlay) {
+    return static_cast<const struct handle_t *>(overlay)->ctl_fd;
+}
+
+static int handle_shared_fd(const overlay_handle_t overlay) {
+    return static_cast<const struct handle_t *>(overlay)->shared_fd;
+}
+
+static int handle_num_buffers(const overlay_handle_t overlay) {
+    return static_cast<const struct handle_t *>(overlay)->num_buffers;
+}
+
+static int handle_width(const overlay_handle_t overlay) {
+    return static_cast<const struct handle_t *>(overlay)->width;
+}
+
+static int handle_height(const overlay_handle_t overlay) {
+    return static_cast<const struct handle_t *>(overlay)->height;
+}
+
+static int handle_shared_size(const overlay_handle_t overlay) {
+    return static_cast<const struct handle_t *>(overlay)->shared_size;
+}
+
+/* A separate instance of this class is created per overlay */
+class overlay_object : public overlay_t
+{
+    handle_t mHandle;
+
+    overlay_ctrl_t    mCtl;
+    overlay_ctrl_t    mCtlStage;
+    overlay_shared_t *mShared;
+
+    static overlay_handle_t getHandleRef(struct overlay_t* overlay) {
+        /* returns a reference to the handle, caller doesn't take ownership */
+        return &(static_cast<overlay_object *>(overlay)->mHandle);
+    }
+
+    public:
+    overlay_object(int ctl_fd, int shared_fd, int shared_size, int w, int h,
+            int format, int num_buffers) {
+        this->overlay_t::getHandleRef = getHandleRef;
+        mHandle.version     = sizeof(native_handle);
+        mHandle.numFds      = 2;
+        mHandle.numInts     = 5; /* extra ints we have in our handle */
+        mHandle.ctl_fd      = ctl_fd;
+        mHandle.shared_fd   = shared_fd;
+        mHandle.width       = w;
+        mHandle.height      = h;
+        mHandle.format      = format;
+        mHandle.num_buffers = num_buffers;
+        mHandle.shared_size = shared_size;
+        this->w = w;
+        this->h = h;
+        this->format = format;
+
+        memset( &mCtl, 0, sizeof( mCtl ) );
+        memset( &mCtlStage, 0, sizeof( mCtlStage ) );
+    }
+
+    int               ctl_fd()    { return mHandle.ctl_fd; }
+    int               shared_fd() { return mHandle.shared_fd; }
+    overlay_ctrl_t*   data()      { return &mCtl; }
+    overlay_ctrl_t*   staging()   { return &mCtlStage; }
+    overlay_shared_t* getShared() { return mShared; }
+    void              setShared( overlay_shared_t *p ) { mShared = p; }
+};
+
+/*****************************************************************************
+ *  Local Functions
+ *****************************************************************************/
+
+static int create_shared_data(overlay_shared_t **shared)
+{
+    int fd;
+    /* assuming sizeof(overlay_shared_t) < a single page */
+    int size = getpagesize();
+    overlay_shared_t *p;
+
+    if ((fd = ashmem_create_region("overlay_data", size)) < 0) {
+        LOGE("Failed to Create Overlay Shared Data!\n");
+        return fd;
+    }
+
+    p = (overlay_shared_t*)mmap(NULL, size, PROT_READ | PROT_WRITE,
+            MAP_SHARED, fd, 0);
+    if (p == MAP_FAILED) {
+        LOGE("Failed to Map Overlay Shared Data!\n");
+        close(fd);
+        return -1;
+    }
+
+    memset(p, 0, size);
+    p->marker = SHARED_DATA_MARKER;
+    p->size   = size;
+    p->refCnt = 1;
+    if (pthread_mutexattr_init(&p->attr) != 0) {
+        LOGE("Failed to initialize overlay mutex attr");
+        goto MutexAttrErr;
+    }
+    if (pthread_mutexattr_setpshared(&p->attr, PTHREAD_PROCESS_SHARED) != 0) {
+        LOGE("Failed to set the overlay mutex attr to be shared across-processes");
+        goto MutexAttrSetErr;
+    }
+    if (pthread_mutex_init(&p->lock, &p->attr) != 0) {
+        LOGE("Failed to initialize overlay mutex\n");
+        goto MutexErr;
+    }
+
+    *shared = p;
+    return fd;
+
+MutexErr:
+MutexAttrSetErr:
+    pthread_mutexattr_destroy(&p->attr);
+MutexAttrErr:
+    munmap(p, size);
+    close(fd);
+    return -1;
+}
+
+static void destroy_shared_data(int shared_fd, overlay_shared_t *shared,
+                                bool closefd )
+{
+    if (shared == NULL)
+        return;
+
+    /* Last side deallocated releases the mutex, otherwise the remaining */
+    /* side will deadlock trying to use an already released mutex */
+    if (android_atomic_dec(&shared->refCnt) == 1) {
+        if (pthread_mutex_destroy(&shared->lock)) {
+            LOGE("Failed to uninitialize overlay mutex!\n");
+        }
+
+        if (pthread_mutexattr_destroy(&shared->attr)) {
+            LOGE("Failed to uninitialize the overlay mutex attr!\n");
+        }
+        shared->marker = 0;
+    }
+
+    if (munmap(shared, shared->size)) {
+        LOGE("Failed to Unmap Overlay Shared Data!\n");
+    }
+
+    if (closefd && close(shared_fd)) {
+        LOGE("Failed to Close Overlay Shared Data!\n");
+    }
+}
+
+static int open_shared_data( overlay_data_context_t *ctx )
+{
+    int rc   = -1;
+    int mode = PROT_READ | PROT_WRITE;
+    int fd   = ctx->shared_fd;
+    int size = ctx->shared_size;
+
+    if (ctx->shared != NULL) {
+        /* Already open, return success */
+        LOGI("Overlay Shared Data Already Open\n");
+        return 0;
+    }
+    ctx->shared = (overlay_shared_t*)mmap(0, size, mode, MAP_SHARED, fd, 0);
+
+    if (ctx->shared == MAP_FAILED) {
+        LOGE("Failed to Map Overlay Shared Data!\n");
+    } else if ( ctx->shared->marker != SHARED_DATA_MARKER ) {
+        LOGE("Invalid Overlay Shared Marker!\n");
+        munmap( ctx->shared, size);
+    } else if ( (int)ctx->shared->size != size ) {
+        LOGE("Invalid Overlay Shared Size!\n");
+        munmap(ctx->shared, size);
+    } else {
+        android_atomic_inc(&ctx->shared->refCnt);
+        rc = 0;
+    }
+
+    return rc;
+}
+
+static void close_shared_data(overlay_data_context_t *ctx)
+{
+    destroy_shared_data(ctx->shared_fd, ctx->shared, false);
+    ctx->shared = NULL;
+}
+
+static int enable_streaming_locked(overlay_shared_t *shared, int ovly_fd)
+{
+    int rc = 0;
+
+    if (!shared->controlReady || !shared->dataReady) {
+        LOGI("Postponing Stream Enable/%d/%d\n", shared->controlReady,
+                shared->dataReady);
+    } else {
+        shared->streamEn = 1;
+        rc = v4l2_overlay_stream_on(ovly_fd);
+        if (rc) {
+            LOGE("Stream Enable Failed!/%d\n", rc);
+            shared->streamEn = 0;
+        }
+    }
+
+    return rc;
+}
+
+static int enable_streaming(overlay_shared_t *shared, int ovly_fd)
+{
+    int ret;
+
+    pthread_mutex_lock(&shared->lock);
+    ret = enable_streaming_locked(shared, ovly_fd);
+    pthread_mutex_unlock(&shared->lock);
+    return ret;
+}
+
+static int disable_streaming_locked(overlay_shared_t *shared, int ovly_fd)
+{
+    int ret = 0;
+
+    if (shared->streamEn) {
+        ret = v4l2_overlay_stream_off( ovly_fd );
+        if (ret) {
+            LOGE("Stream Off Failed!/%d\n", ret);
+        } else {
+            shared->streamingReset = 1;
+            shared->streamEn = 0;
+        }
+    }
+
+    return ret;
+}
+
+static void set_color_space(unsigned int overlay_color_format, unsigned int *v4l2_color_format)
+{
+    switch (overlay_color_format) {
+    case OVERLAY_FORMAT_RGB_565:
+        *v4l2_color_format = V4L2_PIX_FMT_RGB565;
+        break;
+
+    case OVERLAY_FORMAT_YCbYCr_422_I:
+    case HAL_PIXEL_FORMAT_CUSTOM_YCbCr_422_I:
+        *v4l2_color_format = V4L2_PIX_FMT_YUYV;
+        break;
+
+    case OVERLAY_FORMAT_CbYCrY_422_I:
+    case HAL_PIXEL_FORMAT_CUSTOM_CbYCrY_422_I:
+        *v4l2_color_format = V4L2_PIX_FMT_UYVY;
+        break;
+
+    case HAL_PIXEL_FORMAT_YCbCr_420_P:
+        *v4l2_color_format = V4L2_PIX_FMT_YUV420;
+        break;
+
+    case HAL_PIXEL_FORMAT_CUSTOM_YCbCr_420_SP:
+        *v4l2_color_format = V4L2_PIX_FMT_NV12T;
+        break;
+
+    case HAL_PIXEL_FORMAT_CUSTOM_YCrCb_420_SP:
+        *v4l2_color_format = V4L2_PIX_FMT_NV21;
+        break;
+
+    default :
+        LOGE("unsupported pixel format (0x%x)", overlay_color_format);
+        *v4l2_color_format = -1;
+    }
+}
+
+/****************************************************************************
+ *  Control module
+ *****************************************************************************/
+
+static int overlay_get(struct overlay_control_device_t *dev, int name)
+{
+    int result = -1;
+
+    switch (name) {
+    /* 0 = no limit */
+    case OVERLAY_MINIFICATION_LIMIT:   result = 0;  break;
+    /* 0 = no limit */
+    case OVERLAY_MAGNIFICATION_LIMIT:  result = 0;  break;
+    /* 0 = infinite */
+    case OVERLAY_SCALING_FRAC_BITS:    result = 0;  break;
+    /* 90 rotation steps (for instance) */
+    case OVERLAY_ROTATION_STEP_DEG:    result = 90; break;
+    /* 1-pixel alignment */
+    case OVERLAY_HORIZONTAL_ALIGNMENT: result = 1;  break;
+    /* 1-pixel alignment */
+    case OVERLAY_VERTICAL_ALIGNMENT:   result = 1;  break;
+    /* 1-pixel alignment */
+    case OVERLAY_WIDTH_ALIGNMENT:      result = 1;  break;
+    case OVERLAY_HEIGHT_ALIGNMENT:     break;
+    }
+
+    return result;
+}
+
+static int get_fb_var_screeninfo( struct fb_var_screeninfo *info )
+{
+    int fd = -1;
+    int i=0;
+    char name[64];
+    int ret = 0;
+
+    char const * const device_template[] = {
+        "/dev/graphics/fb%u",
+        "/dev/fb%u",
+        0 };
+
+    while ((fd==-1) && device_template[i]) {
+        snprintf(name, 64, device_template[i], 0);
+        fd = open(name, O_RDWR, 0);
+        i++;
+    }
+
+    if (fd < 0)
+        ret = -EINVAL;
+
+    if (ioctl(fd, FBIOGET_VSCREENINFO, info) == -1)
+        ret = -EINVAL;
+
+    if (fd > 0)
+        close(fd);
+
+    return 0;
+}
+static overlay_t* overlay_createOverlay(struct overlay_control_device_t *dev,
+        uint32_t w, uint32_t h, int32_t  format)
+{
+    LOGD("overlay_createOverlay:IN w=%d h=%d format=%d\n", w, h, format);
+    LOG_FUNCTION_NAME;
+
+    overlay_object            *overlay;
+    overlay_control_context_t *ctx = (overlay_control_context_t *)dev;
+    overlay_shared_t          *shared;
+
+    int ret;
+    uint32_t num = NUM_OVERLAY_BUFFERS_REQUESTED;
+    int fd;
+    int shared_fd;
+    struct fb_var_screeninfo info;
+    bool zerocopy = false;
+
+    phyAddr = 0;
+
+    if (format == OVERLAY_FORMAT_DEFAULT) {
+        LOGD("format == OVERLAY_FORMAT_DEFAULT\n");
+        LOGD("set to HAL_PIXEL_FORMAT_CUSTOM_YCrCb_420_SP\n");
+        format = HAL_PIXEL_FORMAT_CUSTOM_YCrCb_420_SP;
+    }
+
+    if (ctx->overlay_video1) {
+        LOGE("Error - overlays already in use\n");
+        return NULL;
+    }
+
+    shared_fd = create_shared_data(&shared);
+    if (shared_fd < 0) {
+        LOGE("Failed to create shared data");
+        return NULL;
+    }
+
+    fd = v4l2_overlay_open(V4L2_OVERLAY_PLANE_VIDEO1);
+    if (fd < 0) {
+        LOGE("Failed to open overlay device : %s\n", strerror(errno));
+        goto error;
+    }
+
+    g_s5p_fimc.params.src.full_width = w;
+    g_s5p_fimc.params.src.full_height = h;
+    g_s5p_fimc.params.src.width = w;
+    g_s5p_fimc.params.src.height = h;
+    set_color_space(format, &g_s5p_fimc.params.src.color_space);
+    ret = check_fimc_src_constraints(&g_s5p_fimc);
+    if(ret != 0) {
+        if(ret < 0) {
+            LOGE("Not supported source image size");
+            goto error1;
+        } else {
+            LOGD("src width, height are changed [w= %d, h= %d]->[w=%d, h= %d]"
+                 , w, h, g_s5p_fimc.params.src.width
+                 , g_s5p_fimc.params.src.height);
+            w = g_s5p_fimc.params.src.width;
+            h = g_s5p_fimc.params.src.height;
+        }
+    }
+
+    if (v4l2_overlay_init(fd, w, h, format, phyAddr)) {
+        LOGE("Failed initializing overlays\n");
+        goto error1;
+    }
+
+    if (v4l2_overlay_set_crop(fd, 0, 0, w, h)) {
+        LOGE("Failed defaulting crop window\n");
+        goto error1;
+    }
+
+    if (v4l2_overlay_set_flip(fd, 0)) {
+        LOGE("Failed defaulting flip\n");
+        goto error1;
+    }
+
+    if (v4l2_overlay_set_rotation(fd, 0, 0)) {
+        LOGE("Failed defaulting rotation\n");
+        goto error1;
+    }
+
+    if (format >= HAL_PIXEL_FORMAT_CUSTOM_YCbCr_420_SP
+            && format < HAL_PIXEL_FORMAT_CUSTOM_MAX)
+        zerocopy = true;
+
+    if (v4l2_overlay_req_buf(fd, &num, 0, (int)zerocopy)) {
+        LOGE("Failed requesting buffers\n");
+        goto error1;
+    }
+
+    v4l2_overlay_init_fimc(fd, &g_s5p_fimc);
+
+    overlay = new overlay_object(fd, shared_fd, shared->size,
+                                 w, h, format, num);
+    if (overlay == NULL) {
+        LOGE("Failed to create overlay object\n");
+        goto error1;
+    }
+    ctx->overlay_video1 = overlay;
+
+    overlay->setShared(shared);
+
+    shared->controlReady = 0;
+    shared->streamEn = 0;
+    shared->streamingReset = 0;
+
+    /* get lcd size from kernel framebuffer */
+    if(get_fb_var_screeninfo(&info) == 0) {
+        shared->dispW = info.xres;
+        shared->dispH = info.yres;
+        g_lcd_width = info.xres;
+        g_lcd_height = info.yres;
+        g_lcd_bpp = info.bits_per_pixel;
+    } else {
+        shared->dispW = g_lcd_width; /* Need to determine this properly */
+        shared->dispH = g_lcd_height; /* Need to determine this properly */
+    }
+
+    LOGI("Opened video1/fd=%d/obj=%08lx/shm=%d/size=%d", fd,
+            (unsigned long)overlay, shared_fd, shared->size);
+
+    return overlay;
+
+error1:
+    close(fd);
+error:
+    destroy_shared_data(shared_fd, shared, true);
+    return NULL;
+}
+
+static void overlay_destroyOverlay(struct overlay_control_device_t *dev,
+        overlay_t* overlay)
+{
+    LOGD("overlay_destroyOverlay:IN dev (%p) and overlay (%p)", dev, overlay);
+    LOG_FUNCTION_NAME;
+
+    overlay_control_context_t *ctx = (overlay_control_context_t *)dev;
+    overlay_object *obj = static_cast<overlay_object *>(overlay);
+
+    int rc;
+    int fd = obj->ctl_fd();
+    uint32_t num = 0;
+
+    overlay_shared_t *shared = obj->getShared();
+
+    if (shared == NULL) {
+        LOGE("Overlay was already destroyed - nothing needs to be done\n");
+        return;
+    }
+
+    pthread_mutex_lock(&shared->lock);
+
+    disable_streaming_locked(shared, fd);
+
+    pthread_mutex_unlock(&shared->lock);
+
+    destroy_shared_data(obj->shared_fd(), shared, true);
+    obj->setShared(NULL);
+
+    if (v4l2_overlay_req_buf(fd, &num, 0, 0)) {
+        LOGE("Failed requesting buffers\n");
+    }
+
+    LOGI("Destroying overlay/fd=%d/obj=%08lx", fd, (unsigned long)overlay);
+
+    if (close(fd)) {
+        LOGE( "Error closing overly fd/%d\n", errno);
+    }
+
+    if (overlay) {
+        if (ctx->overlay_video1 == overlay)
+            ctx->overlay_video1 = NULL;
+        delete overlay;
+        overlay = NULL;
+    }
+    LOGD("overlay_destroyOverlay:OUT");
+}
+
+static int overlay_setPosition(struct overlay_control_device_t *dev,
+        overlay_t* overlay, int x, int y, uint32_t w,
+        uint32_t h)
+{
+    LOG_FUNCTION_NAME;
+
+    overlay_object *obj = static_cast<overlay_object *>(overlay);
+
+    overlay_ctrl_t   *stage  = obj->staging();
+    overlay_shared_t *shared = obj->getShared();
+
+    int rc = 0;
+    int temp_x = x, temp_y = y, temp_w = w, temp_h = h;
+
+    /*
+     * This logic here is to return an error if the rectangle is not fully
+     * within the display, unless we have not received a valid position yet,
+     * in which case we will do our best to adjust the rectangle to be within
+     * the display.
+     */
+
+    /* Require a minimum size */
+    if (temp_w < 16)
+        temp_w = 16;
+    if (temp_h < 8)
+        temp_h = 8;
+
+    if (!shared->controlReady) {
+        if ( temp_x < 0 ) temp_x = 0;
+        if ( temp_y < 0 ) temp_y = 0;
+        if ( temp_w > shared->dispW ) temp_w = shared->dispW;
+        if ( temp_h > shared->dispH ) temp_h = shared->dispH;
+        if ( (temp_x + temp_w) > shared->dispW ) temp_w = shared->dispW - temp_x;
+        if ( (temp_y + temp_h) > shared->dispH ) temp_h = shared->dispH - temp_y;
+    } else if (temp_x < 0 || temp_y < 0 || (temp_x + temp_w) > shared->dispW ||
+            (temp_y + temp_h) > shared->dispH) {
+        /* Return an error */
+        rc = -1;
+    }
+
+    if (rc == 0) {
+        stage->posX = temp_x;
+        stage->posY = temp_y;
+        stage->posW = temp_w;
+        stage->posH = temp_h;
+
+        stage->posX_org = x;
+        stage->posY_org = y;
+        stage->posW_org = w;
+        stage->posH_org = h;
+    }
+
+    return rc;
+}
+
+static int overlay_getPosition(struct overlay_control_device_t *dev,
+        overlay_t* overlay, int* x, int* y, uint32_t* w,
+        uint32_t* h)
+{
+    LOG_FUNCTION_NAME;
+
+    overlay_object *obj = static_cast<overlay_object *>(overlay);
+    overlay_ctrl_t   *stage  = obj->staging();
+
+    *x = stage->posX_org;
+    *y = stage->posY_org;
+    *w = stage->posW_org;
+    *h = stage->posH_org;
+
+    return 0;
+}
+
+static int overlay_setParameter(struct overlay_control_device_t *dev,
+        overlay_t* overlay, int param, int value)
+{
+    LOG_FUNCTION_NAME;
+
+    overlay_ctrl_t *stage = static_cast<overlay_object *>(overlay)->staging();
+    int rc = 0;
+
+    switch (param) {
+    case OVERLAY_DITHER:
+        break;
+
+    case OVERLAY_TRANSFORM:
+        switch ( value )
+        {
+        case 0:
+            stage->rotation = 0;
+            stage->flip = 0;
+            break;
+        case OVERLAY_TRANSFORM_ROT_90:
+            stage->rotation = 90;
+            stage->flip = 0;
+            break;
+        case OVERLAY_TRANSFORM_ROT_180:
+            stage->rotation = 180;
+            stage->flip = 0;
+            break;
+        case OVERLAY_TRANSFORM_ROT_270:
+            stage->rotation = 270;
+            stage->flip = 0;
+            break;
+        // FIMC VFLIP = android overlay FLIP_H.
+        case OVERLAY_TRANSFORM_FLIP_H:
+            stage->rotation = 0;
+            stage->flip = V4L2_CID_VFLIP;
+            break;
+        case OVERLAY_TRANSFORM_FLIP_V:
+            stage->rotation = 0;
+            stage->flip = V4L2_CID_HFLIP;
+            break;
+        // FIMC rotates first but android flips first.
+        case OVERLAY_TRANSFORM_ROT_90+OVERLAY_TRANSFORM_FLIP_H:
+            stage->rotation = 90;
+            stage->flip = V4L2_CID_HFLIP;
+            break;
+        case OVERLAY_TRANSFORM_ROT_90+OVERLAY_TRANSFORM_FLIP_V:
+            stage->rotation = 90;
+            stage->flip = V4L2_CID_VFLIP;
+            break;
+
+        default:
+            rc = -EINVAL;
+            break;
+        }
+        break;
+    }
+
+    return rc;
+}
+
+static int overlay_stage(struct overlay_control_device_t *dev,
+        overlay_t* overlay) {
+    return 0;
+}
+
+static int overlay_commit(struct overlay_control_device_t *dev,
+        overlay_t* overlay) {
+    LOG_FUNCTION_NAME;
+
+    overlay_object *obj = static_cast<overlay_object *>(overlay);
+
+    overlay_ctrl_t   *data   = obj->data();
+    overlay_ctrl_t   *stage  = obj->staging();
+    overlay_shared_t *shared = obj->getShared();
+
+    int ret = 0;
+    int fd = obj->ctl_fd();
+
+    if (shared == NULL) {
+        LOGI("Shared Data Not Init'd!\n");
+        return -1;
+    }
+
+    pthread_mutex_lock(&shared->lock);
+
+    if (!shared->controlReady) {
+        shared->controlReady = 1;
+    }
+
+    g_s5p_fimc.params.dst.full_width = g_lcd_width;
+    g_s5p_fimc.params.dst.full_height = g_lcd_height;
+    g_s5p_fimc.params.dst.width = stage->posW;
+    g_s5p_fimc.params.dst.height = stage->posH;
+    if (g_lcd_bpp == 32)
+        g_s5p_fimc.params.dst.color_space = V4L2_PIX_FMT_RGB32;
+    else
+        g_s5p_fimc.params.dst.color_space = V4L2_PIX_FMT_RGB565;
+    ret = check_fimc_dst_constraints(&g_s5p_fimc, stage->rotation);
+    if (ret != 0) {
+        if (ret < 0) {
+            LOGE("Unsupported destination image size");
+            goto end;
+        } else {
+            LOGD("dst width, height have changed [w= %d, h= %d] -> [w=%d, h= %d]",
+                    stage->posW, stage->posH, g_s5p_fimc.params.dst.width,
+                    g_s5p_fimc.params.dst.height);
+            stage->posW = g_s5p_fimc.params.dst.width;
+            stage->posH = g_s5p_fimc.params.dst.height;
+        }
+    }
+
+    if (data->posX == stage->posX && data->posY == stage->posY &&
+            data->posW == stage->posW && data->posH == stage->posH &&
+            data->rotation == stage->rotation &&
+            data->flip == stage->flip) {
+        LOGI("Nothing to do!\n");
+        goto end;
+    }
+
+    LOGD("Position/X%d/Y%d/W%d/H%d\n", data->posX, data->posY, data->posW,
+            data->posH);
+    LOGD("Adjusted Position/X%d/Y%d/W%d/H%d\n", stage->posX, stage->posY,
+            stage->posW, stage->posH);
+    LOGD("Rotation/%d\n", stage->rotation );
+
+    if ((ret = disable_streaming_locked(shared, fd)))
+        goto end;
+
+    if (stage->flip != data->flip) {
+        ret = v4l2_overlay_set_flip(fd, stage->flip);
+        if (ret) {
+            LOGE("Set Flip Failed!/%d\n", ret);
+            goto end;
+        }
+    }
+
+    if (stage->rotation != data->rotation) {
+        ret = v4l2_overlay_set_rotation(fd, stage->rotation, 0);
+        if (ret) {
+            LOGE("Set Rotation Failed!/%d\n", ret);
+            goto end;
+        }
+        v4l2_overlay_s_fbuf(fd, stage->rotation);
+    }
+
+    ret = v4l2_overlay_set_position(fd, stage->posX, stage->posY,
+            stage->posW, stage->posH, stage->rotation);
+    if (ret) {
+        LOGE("Set Position Failed!/%d\n", ret);
+        goto end;
+    }
+
+    data->posX = stage->posX;
+    data->posY = stage->posY;
+    data->posW = stage->posW;
+    data->posH = stage->posH;
+    data->rotation = stage->rotation;
+    data->flip = stage->flip;
+
+    ret = enable_streaming_locked(shared, fd);
+
+end:
+    pthread_mutex_unlock(&shared->lock);
+
+    return ret;
+}
+
+static int overlay_control_close(struct hw_device_t *dev)
+{
+    LOG_FUNCTION_NAME;
+
+    struct overlay_control_context_t* ctx =
+           (struct overlay_control_context_t*)dev;
+    overlay_object *overlay_v1;
+
+    if (ctx) {
+        overlay_v1 = static_cast<overlay_object *>(ctx->overlay_video1);
+
+        overlay_destroyOverlay((struct overlay_control_device_t *)ctx,
+                overlay_v1);
+
+        free(ctx);
+    }
+    return 0;
+}
+
+static int get_pixel_format_type(unsigned int pixelformat)
+{
+    switch(pixelformat) {
+    case V4L2_PIX_FMT_RGB32:
+    case V4L2_PIX_FMT_RGB565:
+        return PFT_RGB;
+
+    case V4L2_PIX_FMT_NV12:
+    case V4L2_PIX_FMT_NV12T:
+    case V4L2_PIX_FMT_NV21:
+    case V4L2_PIX_FMT_YUV420:
+        return PFT_YUV420;
+
+    case V4L2_PIX_FMT_YUYV:
+    case V4L2_PIX_FMT_UYVY:
+    case V4L2_PIX_FMT_YVYU:
+    case V4L2_PIX_FMT_VYUY:
+    case V4L2_PIX_FMT_NV16:
+    case V4L2_PIX_FMT_NV61:
+    case V4L2_PIX_FMT_YUV422P:
+        return PFT_YUV422;
+
+    default:
+        return PFT_YUV444;
+    }
+}
+
+/* check the constraints of destination image size */
+static int check_fimc_dst_constraints(s5p_fimc_t *s5p_fimc,
+                                      unsigned int rotation)
+{
+    int tmp = 0;
+
+    if((s5p_fimc->params.dst.height > 0) && (s5p_fimc->params.dst.height < 16))
+        s5p_fimc->params.dst.height = 16;
+
+    if(s5p_fimc->params.dst.width%8 != 0) {
+        tmp = s5p_fimc->params.dst.width - (s5p_fimc->params.dst.width%8);
+        if(tmp <= 0)
+            return -1;
+        else
+            s5p_fimc->params.dst.width = tmp;
+    }
+
+    return 1;
+}
+/* check the constraints of source image size */
+static int check_fimc_src_constraints(s5p_fimc_t *s5p_fimc)
+{
+    int format_type = 0;
+
+    if(s5p_fimc->params.src.full_width < 16 ||
+        s5p_fimc->params.src.full_height < 8 )
+        return -1;
+
+    if(s5p_fimc->hw_ver == 0x50) {
+        format_type = get_pixel_format_type(s5p_fimc->params.src.color_space);
+        switch (format_type) {
+        case PFT_YUV420:
+            if (s5p_fimc->params.src.height%2 != 0)
+                s5p_fimc->params.src.height = s5p_fimc->params.src.height
+                                      - (s5p_fimc->params.src.height)%2;
+
+            if (s5p_fimc->params.src.width%2 != 0)
+                s5p_fimc->params.src.width = s5p_fimc->params.src.width
+                                      - (s5p_fimc->params.src.width)%2;
+            break;
+
+        case PFT_YUV422:
+            if (s5p_fimc->params.src.width%2 != 0)
+                s5p_fimc->params.src.width = s5p_fimc->params.src.width
+                                      - (s5p_fimc->params.src.width)%2;
+        }
+    } else {
+        if (s5p_fimc->params.src.height < 8) {
+            s5p_fimc->params.src.height = 8;
+        }
+
+        if (s5p_fimc->params.src.width%16 != 0) {
+            s5p_fimc->params.src.width = s5p_fimc->params.src.width
+                                          - (s5p_fimc->params.src.width)%16;
+        }
+    }
+
+    return 1;
+}
+
+/****************************************************************************
+ * Data module
+ *****************************************************************************/
+
+int overlay_initialize(struct overlay_data_device_t *dev,
+        overlay_handle_t handle)
+{
+    LOG_FUNCTION_NAME;
+
+    struct overlay_data_context_t* ctx = (struct overlay_data_context_t*)dev;
+    struct stat stat;
+
+    int i;
+    int rc = -1;
+
+    ctx->num_buffers  = handle_num_buffers(handle);
+    ctx->width        = handle_width(handle);
+    ctx->height       = handle_height(handle);
+    ctx->format       = handle_format(handle);
+    ctx->ctl_fd       = handle_ctl_fd(handle);
+    ctx->shared_fd    = handle_shared_fd(handle);
+    ctx->shared_size  = handle_shared_size(handle);
+    ctx->shared       = NULL;
+    ctx->qd_buf_count = 0;
+    ctx->cacheable_buffers = 0;
+
+    if (ctx->format >= HAL_PIXEL_FORMAT_CUSTOM_YCbCr_420_SP
+            && ctx->format < HAL_PIXEL_FORMAT_CUSTOM_MAX)
+        ctx->zerocopy = true;
+    else
+        ctx->zerocopy = false;
+
+    if (fstat(ctx->ctl_fd, &stat)) {
+        LOGE("Error = %s from %s\n", strerror(errno), "overlay initialize");
+        return -1;
+    }
+
+    if (open_shared_data(ctx)) {
+        return -1;
+    }
+
+    ctx->shared->dataReady = 0;
+
+    ctx->mapping_data = new struct mapping_data;
+    ctx->buffers     = new void* [ctx->num_buffers];
+    ctx->buffers_len = new size_t[ctx->num_buffers];
+
+    if (!ctx->buffers || !ctx->buffers_len || !ctx->mapping_data) {
+        LOGE("Failed alloc'ing buffer arrays\n");
+        goto error;
+    } else {
+
+        /*
+         * in the zero copy case,
+         * don't need to mmap buffer for source
+         */
+        if (ctx->zerocopy)
+            rc = 0;
+        else {
+            for (i = 0; i < ctx->num_buffers; i++) {
+                rc = v4l2_overlay_map_buf(ctx->ctl_fd, i, &ctx->buffers[i],
+                        &ctx->buffers_len[i]);
+                if (rc) {
+                    LOGE("Failed mapping buffers\n");
+                    goto error;
+                }
+            }
+        }
+    }
+
+    v4l2_overlay_init_fimc(ctx->ctl_fd, &g_s5p_fimc);
+
+    return ( rc );
+
+error:
+
+    if(ctx->mapping_data)
+        delete (ctx->mapping_data);
+    if(ctx->buffers)
+        delete [] ctx->buffers;
+    if(ctx->buffers_len)
+        delete [] ctx->buffers_len;
+
+    close_shared_data( ctx );
+
+    return -1;
+}
+
+static int overlay_resizeInput(struct overlay_data_device_t *dev, uint32_t w,
+        uint32_t h)
+{
+    int rc = -1;
+    int ret = 0;
+
+    struct overlay_data_context_t* ctx = (struct overlay_data_context_t*)dev;
+
+    if ((ctx->width == (int)w) && (ctx->width == (int)h)) {
+        LOGV("same as current width and height. so do nothing");
+        return 0;
+    }
+
+    if (!ctx->shared) {
+        LOGI("Shared Data Not Init'd!\n");
+        return -1;
+    }
+
+    if (ctx->shared->dataReady) {
+        LOGV("Either setCrop() or queueBuffer() was called prior to this!"
+                "Therefore failing this call.\n");
+        return -1;
+    }
+
+    pthread_mutex_lock(&ctx->shared->lock);
+
+    if ((rc = disable_streaming_locked(ctx->shared, ctx->ctl_fd)))
+        goto end;
+
+    if (!ctx->zerocopy) {
+        for (int i = 0; i < ctx->num_buffers; i++) {
+            v4l2_overlay_unmap_buf(ctx->buffers[i], ctx->buffers_len[i]);
+        }
+    }
+
+    g_s5p_fimc.params.src.full_width = w;
+    g_s5p_fimc.params.src.full_height = h;
+    g_s5p_fimc.params.src.width = w;
+    g_s5p_fimc.params.src.height = h;
+    set_color_space(ctx->format, &g_s5p_fimc.params.src.color_space);
+    ret = check_fimc_src_constraints(&g_s5p_fimc);
+
+    if(ret != 0) {
+        if(ret < 0) {
+            LOGE("Not supported source image size");
+            goto end;
+        } else {
+            LOGD("src width, height are changed [w= %d, h= %d] -> [w=%d, h= %d]"
+                 , w, h, g_s5p_fimc.params.src.width
+                 , g_s5p_fimc.params.src.height);
+            w = g_s5p_fimc.params.src.width;
+            h = g_s5p_fimc.params.src.height;
+        }
+    }
+
+    rc = v4l2_overlay_init(ctx->ctl_fd, w, h, ctx->format, phyAddr);
+    if (rc) {
+        LOGE("Error initializing overlay");
+        goto end;
+    }
+    rc = v4l2_overlay_set_crop(ctx->ctl_fd, 0, 0, w, h);
+    if (rc) {
+        LOGE("Error setting crop window\n");
+        goto end;
+    }
+    rc = v4l2_overlay_req_buf(ctx->ctl_fd, (uint32_t *)(&ctx->num_buffers),
+            ctx->cacheable_buffers, (int)ctx->zerocopy);
+    if (rc) {
+        LOGE("Error creating buffers");
+        goto end;
+    }
+
+    if (!ctx->zerocopy) {
+        for (int i = 0; i < ctx->num_buffers; i++)
+            v4l2_overlay_map_buf(ctx->ctl_fd, i, &ctx->buffers[i],
+                    &ctx->buffers_len[i]);
+    }
+
+    rc = enable_streaming_locked(ctx->shared, ctx->ctl_fd);
+
+end:
+    pthread_mutex_unlock(&ctx->shared->lock);
+
+    return rc;
+}
+
+
+static int overlay_data_setParameter(struct overlay_data_device_t *dev,
+        int param, int value)
+{
+    int ret = 0;
+    struct overlay_data_context_t* ctx = (struct overlay_data_context_t*)dev;
+
+    if (ctx->shared == NULL) {
+        LOGI("Shared Data Not Init'd!\n");
+        return -1;
+    }
+
+    if (ctx->shared->dataReady) {
+        LOGI("Too late. Cant set it now!\n");
+        return -1;
+    }
+
+    if (param == CACHEABLE_BUFFERS)
+        ctx->cacheable_buffers = value;
+
+    return ( ret );
+}
+
+
+static int overlay_setCrop(struct overlay_data_device_t *dev, uint32_t x,
+        uint32_t y, uint32_t w, uint32_t h) {
+    LOG_FUNCTION_NAME;
+
+    int rc = 0;
+    int cnt = 0;
+    struct overlay_data_context_t* ctx = (struct overlay_data_context_t*)dev;
+
+    if (ctx->shared == NULL) {
+        LOGI("Shared Data Not Init'd!\n");
+        return -1;
+    }
+
+    pthread_mutex_lock(&ctx->shared->lock);
+
+    ctx->shared->dataReady = 1;
+
+    if (ctx->data.cropX == x && ctx->data.cropY == y && ctx->data.cropW == w
+            && ctx->data.cropH == h) {
+        goto end;
+    }
+
+    ctx->data.cropX = x;
+    ctx->data.cropY = y;
+    ctx->data.cropW = w;
+    ctx->data.cropH = h;
+
+    LOGD("Crop Win/X%d/Y%d/W%d/H%d\n", x, y, w, h );
+
+    if ((rc = disable_streaming_locked(ctx->shared, ctx->ctl_fd)))
+        goto end;
+
+    rc = v4l2_overlay_set_crop(ctx->ctl_fd, x, y, w, h);
+    if (rc) {
+        LOGE("Set Crop Window Failed!/%d\n", rc);
+    }
+
+    rc = enable_streaming_locked(ctx->shared, ctx->ctl_fd);
+
+end:
+    pthread_mutex_unlock(&ctx->shared->lock);
+    return rc;
+}
+
+static int overlay_getCrop(struct overlay_data_device_t *dev , uint32_t* x,
+        uint32_t* y, uint32_t* w, uint32_t* h) {
+    struct overlay_data_context_t* ctx = (struct overlay_data_context_t*)dev;
+
+    return v4l2_overlay_get_crop(ctx->ctl_fd, x, y, w, h);
+}
+
+int overlay_dequeueBuffer(struct overlay_data_device_t *dev,
+        overlay_buffer_t *buffer) {
+    /* blocks until a buffer is available and return an opaque structure
+     * representing this buffer.
+     */
+
+    struct overlay_data_context_t* ctx = (struct overlay_data_context_t*)dev;
+
+    int rc=0;
+    int i = -1;
+    uint32_t num = 0;
+    int cnt = 0;
+
+    pthread_mutex_lock(&ctx->shared->lock);
+    if ( ctx->shared->streamingReset ) {
+        ctx->shared->streamingReset = 0;
+        pthread_mutex_unlock(&ctx->shared->lock);
+        return ALL_BUFFERS_FLUSHED;
+    }
+    pthread_mutex_unlock(&ctx->shared->lock);
+
+    /* If we are not streaming dequeue will fail,
+       skip to prevent error printouts */
+    if (ctx->shared->streamEn && ctx->qd_buf_count) {
+        if ((rc = v4l2_overlay_dq_buf( ctx->ctl_fd, &i ,ctx->zerocopy)) != 0) {
+            LOGE("Failed to DQ/%d\n", rc);
+        }
+        else if (i < 0 || i > ctx->num_buffers) {
+            rc = -EINVAL;
+        } else {
+            *((int *)buffer) = i;
+            ctx->qd_buf_count --;
+        }
+    } else {
+        rc = -1;
+    }
+
+    return rc;
+}
+
+int overlay_queueBuffer(struct overlay_data_device_t *dev,
+        overlay_buffer_t buffer) {
+    struct overlay_data_context_t* ctx = (struct overlay_data_context_t*)dev;
+
+    int cnt = 0;
+
+    pthread_mutex_lock(&ctx->shared->lock);
+    if ( ctx->shared->streamingReset ) {
+        ctx->shared->streamingReset = 0;
+        pthread_mutex_unlock(&ctx->shared->lock);
+        return ALL_BUFFERS_FLUSHED;
+    }
+    pthread_mutex_unlock(&ctx->shared->lock);
+
+    /* Catch the case where the data side had no need to set the crop window */
+    if (!ctx->shared->dataReady) {
+        ctx->shared->dataReady = 1;
+        enable_streaming(ctx->shared, ctx->ctl_fd);
+    }
+
+    if (!ctx->shared->controlReady) return -1;
+    int rc = v4l2_overlay_q_buf( ctx->ctl_fd, (int)buffer, (int) ctx->zerocopy );
+    if (rc == 0 && ctx->qd_buf_count < ctx->num_buffers) {
+        ctx->qd_buf_count ++;
+    }
+
+    return rc;
+}
+
+void *overlay_getBufferAddress(struct overlay_data_device_t *dev,
+        overlay_buffer_t buffer)
+{
+    LOG_FUNCTION_NAME;
+
+    /* this may fail (NULL) if this feature is not supported. In that case,
+     * presumably, there is some other HAL module that can fill the buffer,
+     * using a DSP for instance
+     */
+    int ret;
+    struct v4l2_buffer buf;
+    struct overlay_data_context_t* ctx = (struct overlay_data_context_t*)dev;
+
+    if (ctx->zerocopy)
+        return NULL;
+
+    if ((int)buffer >= 0 && (int)buffer < ctx->num_buffers)
+        return (void*) ctx->buffers[(int)buffer];
+    else
+        return NULL;
+}
+
+int overlay_getBufferCount(struct overlay_data_device_t *dev)
+{
+    LOG_FUNCTION_NAME;
+
+    struct overlay_data_context_t* ctx = (struct overlay_data_context_t*)dev;
+
+    return (ctx->num_buffers);
+}
+
+static int overlay_data_close(struct hw_device_t *dev) {
+
+    LOG_FUNCTION_NAME;
+
+    struct overlay_data_context_t* ctx = (struct overlay_data_context_t*)dev;
+    int rc;
+
+    if (ctx) {
+        overlay_data_device_t *overlay_dev = &ctx->device;
+        int buf;
+        int i;
+
+        pthread_mutex_lock(&ctx->shared->lock);
+
+        if (!ctx->zerocopy)
+            for (i = 0; i < ctx->num_buffers; i++) {
+                LOGV("Unmap Buffer/%d/%08lx/%d", i, (unsigned long)ctx->buffers[i],
+                                                 ctx->buffers_len[i] );
+                rc = v4l2_overlay_unmap_buf(ctx->buffers[i], ctx->buffers_len[i]);
+                if (rc != 0) {
+                    LOGE("Error unmapping the buffer/%d/%d", i, rc);
+                }
+            }
+
+        delete (ctx->mapping_data);
+        delete [] ctx->buffers;
+        delete [] ctx->buffers_len;
+
+        pthread_mutex_unlock(&ctx->shared->lock);
+
+        ctx->shared->dataReady = 0;
+        close_shared_data( ctx );
+
+        free(ctx);
+    }
+
+    return 0;
+}
+
+/*****************************************************************************/
+
+static int overlay_device_open(const struct hw_module_t* module,
+        const char* name, struct hw_device_t** device)
+{
+    LOG_FUNCTION_NAME;
+    int status = -EINVAL;
+
+    if (!strcmp(name, OVERLAY_HARDWARE_CONTROL)) {
+        struct overlay_control_context_t *dev;
+        dev = (overlay_control_context_t*)malloc(sizeof(*dev));
+
+        /* initialize our state here */
+        memset(dev, 0, sizeof(*dev));
+
+        /* initialize the procs */
+        dev->device.common.tag = HARDWARE_DEVICE_TAG;
+        dev->device.common.version = 0;
+        dev->device.common.module = const_cast<hw_module_t*>(module);
+        dev->device.common.close = overlay_control_close;
+
+        dev->device.get = overlay_get;
+        dev->device.createOverlay = overlay_createOverlay;
+        dev->device.destroyOverlay = overlay_destroyOverlay;
+        dev->device.setPosition = overlay_setPosition;
+        dev->device.getPosition = overlay_getPosition;
+        dev->device.setParameter = overlay_setParameter;
+        dev->device.stage = overlay_stage;
+        dev->device.commit = overlay_commit;
+
+        *device = &dev->device.common;
+        status = 0;
+    } else if (!strcmp(name, OVERLAY_HARDWARE_DATA)) {
+        struct overlay_data_context_t *dev;
+        dev = (overlay_data_context_t*)malloc(sizeof(*dev));
+
+        /* initialize our state here */
+        memset(dev, 0, sizeof(*dev));
+
+        /* initialize the procs */
+        dev->device.common.tag = HARDWARE_DEVICE_TAG;
+        dev->device.common.version = 0;
+        dev->device.common.module = const_cast<hw_module_t*>(module);
+        dev->device.common.close = overlay_data_close;
+
+        dev->device.initialize = overlay_initialize;
+        dev->device.resizeInput = overlay_resizeInput;
+        dev->device.setCrop = overlay_setCrop;
+        dev->device.getCrop = overlay_getCrop;
+        dev->device.setParameter = overlay_data_setParameter;
+        dev->device.dequeueBuffer = overlay_dequeueBuffer;
+        dev->device.queueBuffer = overlay_queueBuffer;
+        dev->device.getBufferAddress = overlay_getBufferAddress;
+        dev->device.getBufferCount = overlay_getBufferCount;
+
+        *device = &dev->device.common;
+        status = 0;
+    }
+    return status;
+}
diff --git a/liboverlay/v4l2_utils.c b/liboverlay/v4l2_utils.c
new file mode 100644
index 0000000..f3ebbc2
--- /dev/null
+++ b/liboverlay/v4l2_utils.c
@@ -0,0 +1,788 @@
+/*
+ * 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.
+ */
+
+/* #define OVERLAY_DEBUG 1 */
+#define LOG_TAG "v4l2_utils"
+
+#include <fcntl.h>
+#include <errno.h>
+#include <cutils/log.h>
+#include <hardware/overlay.h>
+#include <linux/videodev.h>
+#include <sys/ioctl.h>
+#include <sys/mman.h>
+#include "v4l2_utils.h"
+
+#ifndef V4L2_DEVICE
+#define V4L2_DEVICE "/dev/video1"
+#endif
+
+
+
+#define LOG_FUNCTION_NAME    LOGV("%s: %s",  __FILE__, __func__);
+
+#define V4L2_CID_PRIV_OFFSET         0x0
+#define V4L2_CID_PRIV_ROTATION       (V4L2_CID_PRIVATE_BASE \
+        + V4L2_CID_PRIV_OFFSET + 0)
+#define V4L2_CID_PRIV_COLORKEY       (V4L2_CID_PRIVATE_BASE \
+        + V4L2_CID_PRIV_OFFSET + 1)
+#define V4L2_CID_PRIV_COLORKEY_EN    (V4L2_CID_PRIVATE_BASE \
+        + V4L2_CID_PRIV_OFFSET + 2)
+
+extern unsigned int g_lcd_width;
+extern unsigned int g_lcd_height;
+extern unsigned int g_lcd_bpp;
+
+int v4l2_overlay_get(int name)
+{
+    int result = -1;
+    switch (name) {
+    case OVERLAY_MINIFICATION_LIMIT:
+        result = 4; /* 0 = no limit */
+        break;
+    case OVERLAY_MAGNIFICATION_LIMIT:
+        result = 2; /* 0 = no limit */
+        break;
+    case OVERLAY_SCALING_FRAC_BITS:
+        result = 0; /* 0 = infinite */
+        break;
+    case OVERLAY_ROTATION_STEP_DEG:
+        result = 90; /* 90 rotation steps (for instance) */
+        break;
+    case OVERLAY_HORIZONTAL_ALIGNMENT:
+        result = 1; /* 1-pixel alignment */
+        break;
+    case OVERLAY_VERTICAL_ALIGNMENT:
+        result = 1; /* 1-pixel alignment */
+        break;
+    case OVERLAY_WIDTH_ALIGNMENT:
+        result = 1; /* 1-pixel alignment */
+        break;
+    case OVERLAY_HEIGHT_ALIGNMENT:
+        result = 1; /* 1-pixel alignment */
+        break;
+    }
+    return result;
+}
+
+int v4l2_overlay_open(int id)
+{
+    LOG_FUNCTION_NAME
+    return open(V4L2_DEVICE, O_RDWR);
+}
+
+int v4l2_overlay_init_fimc(int fd, s5p_fimc_t *s5p_fimc)
+{
+    int ret;
+    struct v4l2_control    vc;
+
+    if (fd < 0)
+        return -1;
+
+    vc.id = V4L2_CID_FIMC_VERSION;
+    vc.value = 0;
+
+    s5p_fimc->dev_fd = fd;
+
+    ret = ioctl(s5p_fimc->dev_fd, VIDIOC_G_CTRL, &vc);
+    if (ret < 0) {
+        LOGE("Error in video VIDIOC_G_CTRL - V4L2_CID_FIMC_VERSION (%d)", ret);
+        LOGE("FIMC version is set with default");
+        vc.value = 0x43;
+    }
+    s5p_fimc->hw_ver = vc.value;
+    return 0;
+}
+
+void dump_pixfmt(struct v4l2_pix_format *pix)
+{
+    LOGV("w: %d\n", pix->width);
+    LOGV("h: %d\n", pix->height);
+    LOGV("color: %x\n", pix->colorspace);
+
+    switch (pix->pixelformat) {
+    case V4L2_PIX_FMT_YUYV:
+        LOGV("YUYV\n");
+        break;
+    case V4L2_PIX_FMT_UYVY:
+        LOGV("UYVY\n");
+        break;
+    case V4L2_PIX_FMT_RGB565:
+        LOGV("RGB565\n");
+        break;
+    case V4L2_PIX_FMT_RGB565X:
+        LOGV("RGB565X\n");
+        break;
+    default:
+        LOGV("not supported\n");
+    }
+}
+
+void dump_crop(struct v4l2_crop *crop)
+{
+    LOGV("crop l: %d ", crop->c.left);
+    LOGV("crop t: %d ", crop->c.top);
+    LOGV("crop w: %d ", crop->c.width);
+    LOGV("crop h: %d\n", crop->c.height);
+}
+
+void dump_window(struct v4l2_window *win)
+{
+    LOGV("window l: %d ", win->w.left);
+    LOGV("window t: %d ", win->w.top);
+    LOGV("window w: %d ", win->w.width);
+    LOGV("window h: %d\n", win->w.height);
+}
+
+void v4l2_overlay_dump_state(int fd)
+{
+    struct v4l2_format format;
+    struct v4l2_crop crop;
+    int ret;
+
+    LOGV("dumping driver state:");
+    format.type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
+    ret = ioctl(fd, VIDIOC_G_FMT, &format);
+    if (ret < 0)
+        return;
+    LOGV("output pixfmt:\n");
+    dump_pixfmt(&format.fmt.pix);
+
+    format.type = V4L2_BUF_TYPE_VIDEO_OVERLAY;
+    ret = ioctl(fd, VIDIOC_G_FMT, &format);
+    if (ret < 0)
+        return;
+    LOGV("v4l2_overlay window:\n");
+    dump_window(&format.fmt.win);
+
+    crop.type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
+    ret = ioctl(fd, VIDIOC_G_CROP, &crop);
+    if (ret < 0)
+        return;
+    LOGV("output crop:\n");
+    dump_crop(&crop);
+}
+
+static void error(int fd, const char *msg)
+{
+    LOGE("Error = %s from %s", strerror(errno), msg);
+#ifdef OVERLAY_DEBUG
+    v4l2_overlay_dump_state(fd);
+#endif
+}
+
+static int v4l2_overlay_ioctl(int fd, int req, void *arg, const char* msg)
+{
+    int ret;
+    ret = ioctl(fd, req, arg);
+    if (ret < 0) {
+        error(fd, msg);
+        return -1;
+    }
+    return 0;
+}
+
+#define v4l2_fourcc(a, b, c, d)  ((__u32)(a) | ((__u32)(b) << 8) | \
+                                 ((__u32)(c) << 16) | ((__u32)(d) << 24))
+/* 12  Y/CbCr 4:2:0 64x32 macroblocks */
+#define V4L2_PIX_FMT_NV12T       v4l2_fourcc('T', 'V', '1', '2')
+
+int configure_pixfmt(struct v4l2_pix_format *pix, int32_t fmt,
+        uint32_t w, uint32_t h)
+{
+    LOG_FUNCTION_NAME
+    int fd;
+
+    switch (fmt) {
+    case OVERLAY_FORMAT_RGBA_8888:
+        return -1;
+    case OVERLAY_FORMAT_RGB_565:
+        pix->pixelformat = V4L2_PIX_FMT_RGB565;
+        break;
+    case OVERLAY_FORMAT_BGRA_8888:
+        return -1;
+    case OVERLAY_FORMAT_YCbYCr_422_I:
+    case HAL_PIXEL_FORMAT_CUSTOM_YCbCr_422_I:
+        pix->pixelformat = V4L2_PIX_FMT_YUYV;
+        break;
+    case OVERLAY_FORMAT_CbYCrY_422_I:
+    case HAL_PIXEL_FORMAT_CUSTOM_CbYCrY_422_I:
+        pix->pixelformat = V4L2_PIX_FMT_UYVY;
+        break;
+    case HAL_PIXEL_FORMAT_YCbCr_420_P:
+        pix->pixelformat = V4L2_PIX_FMT_YUV420;
+        break;
+    case HAL_PIXEL_FORMAT_CUSTOM_YCbCr_420_SP:
+        pix->pixelformat = V4L2_PIX_FMT_NV12T;
+        break;
+    case HAL_PIXEL_FORMAT_CUSTOM_YCrCb_420_SP:
+        pix->pixelformat = V4L2_PIX_FMT_NV21;
+        break;
+    default:
+        return -1;
+    }
+    pix->width = w;
+    pix->height = h;
+    return 0;
+}
+
+static void configure_window(struct v4l2_window *win, int32_t w,
+        int32_t h, int32_t x, int32_t y)
+{
+    LOG_FUNCTION_NAME
+
+    win->w.left = x;
+    win->w.top = y;
+    win->w.width = w;
+    win->w.height = h;
+}
+
+void get_window(struct v4l2_format *format, int32_t *x,
+        int32_t *y, int32_t *w, int32_t *h)
+{
+    LOG_FUNCTION_NAME
+
+    *x = format->fmt.win.w.left;
+    *y = format->fmt.win.w.top;
+    *w = format->fmt.win.w.width;
+    *h = format->fmt.win.w.height;
+}
+
+int v4l2_overlay_init(int fd, uint32_t w, uint32_t h, uint32_t fmt,
+                      uint32_t addr)
+{
+    LOG_FUNCTION_NAME
+
+    struct v4l2_format format;
+    struct v4l2_framebuffer fbuf;
+    int ret;
+
+    format.type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
+    ret = v4l2_overlay_ioctl(fd, VIDIOC_G_FMT, &format, "get format");
+    if (ret)
+        return ret;
+    LOGV("v4l2_overlay_init:: w=%d h=%d\n", format.fmt.pix.width,
+         format.fmt.pix.height);
+
+    format.type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
+    configure_pixfmt(&format.fmt.pix, fmt, w, h);
+    LOGV("v4l2_overlay_init:: w=%d h=%d\n", format.fmt.pix.width,
+         format.fmt.pix.height);
+    ret = v4l2_overlay_ioctl(fd, VIDIOC_S_FMT, &format, "set output format");
+    if (ret)
+        return ret;
+
+    ret = v4l2_overlay_s_fbuf(fd, 0);
+    if (ret)
+        return ret;
+
+    return ret;
+}
+
+int v4l2_overlay_s_fbuf(int fd, int rotation)
+{
+    struct v4l2_framebuffer fbuf;
+    int ret;
+
+    /* configure the v4l2_overlay framebuffer */
+    ret = v4l2_overlay_ioctl(fd, VIDIOC_G_FBUF, &fbuf, "get fbuf");
+    if (ret)
+        return ret;
+
+    /* if fbuf.base value is set by 0, using local DMA. */
+    fbuf.base             = (void *)0;
+    if (rotation == 0 || rotation == 180) {
+        fbuf.fmt.width         = g_lcd_width;
+        fbuf.fmt.height     = g_lcd_height;
+    } else {
+        fbuf.fmt.width         = g_lcd_height;
+        fbuf.fmt.height     = g_lcd_width;
+    }
+
+    if (g_lcd_bpp == 32)
+        fbuf.fmt.pixelformat     = V4L2_PIX_FMT_RGB32;
+    else
+        fbuf.fmt.pixelformat     = V4L2_PIX_FMT_RGB565;
+
+    ret = v4l2_overlay_ioctl(fd, VIDIOC_S_FBUF, &fbuf, "set fbuf");
+    if (ret)
+        return ret;
+
+    return ret;
+}
+
+int v4l2_overlay_get_input_size_and_format(int fd, uint32_t *w, uint32_t *h
+                                                 , uint32_t *fmt)
+{
+    LOG_FUNCTION_NAME
+
+    struct v4l2_format format;
+    int ret;
+
+    format.type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
+    ret = v4l2_overlay_ioctl(fd, VIDIOC_G_FMT, &format, "get format");
+    *w = format.fmt.pix.width;
+    *h = format.fmt.pix.height;
+    if (format.fmt.pix.pixelformat == V4L2_PIX_FMT_YUYV)
+        *fmt = OVERLAY_FORMAT_CbYCrY_422_I;
+    else
+        return -EINVAL;
+    return ret;
+}
+
+int v4l2_overlay_set_position(int fd, int32_t x, int32_t y
+                                    , int32_t w, int32_t h, int rotation)
+{
+    LOG_FUNCTION_NAME
+
+    struct v4l2_format format;
+    int ret;
+    int rot_x = 0, rot_y = 0 , rot_w = 0, rot_h = 0;
+
+    /* configure the src format pix */
+    /* configure the dst v4l2_overlay window */
+    format.type = V4L2_BUF_TYPE_VIDEO_OVERLAY;
+    ret = v4l2_overlay_ioctl(fd, VIDIOC_G_FMT, &format,
+            "get v4l2_overlay format");
+    if (ret)
+        return ret;
+    LOGV("v4l2_overlay_set_position:: w=%d h=%d", format.fmt.win.w.width
+                                                , format.fmt.win.w.height);
+
+    if (rotation == 0) {
+        rot_x = x;
+        rot_y = y;
+        rot_w = w;
+        rot_h = h;
+    } else if (rotation == 90) {
+        rot_x = y;
+        rot_y = g_lcd_width - (x + w);
+        rot_w = h;
+        rot_h = w;
+    } else if (rotation == 180) {
+        rot_x = g_lcd_width - (x + w);
+        rot_y = g_lcd_height - (y + h);
+        rot_w = w;
+        rot_h = h;
+    } else if (rotation == 270) {
+        rot_x = g_lcd_height - (y + h);
+        rot_y = x;
+        rot_w = h;
+        rot_h = w;
+    }
+
+    configure_window(&format.fmt.win, rot_w, rot_h, rot_x, rot_y);
+
+    format.type = V4L2_BUF_TYPE_VIDEO_OVERLAY;
+    ret = v4l2_overlay_ioctl(fd, VIDIOC_S_FMT, &format,
+            "set v4l2_overlay format");
+
+    LOGV("v4l2_overlay_set_position:: w=%d h=%d rotation=%d"
+                 , format.fmt.win.w.width, format.fmt.win.w.height, rotation);
+
+    if (ret)
+        return ret;
+    v4l2_overlay_dump_state(fd);
+
+    return 0;
+}
+
+int v4l2_overlay_get_position(int fd, int32_t *x, int32_t *y, int32_t *w,
+                              int32_t *h)
+{
+    struct v4l2_format format;
+    int ret;
+
+    format.type = V4L2_BUF_TYPE_VIDEO_OVERLAY;
+    ret = v4l2_overlay_ioctl(fd, VIDIOC_G_FMT, &format,
+                                 "get v4l2_overlay format");
+
+    if (ret)
+        return ret;
+
+    get_window(&format, x, y, w, h);
+
+    return 0;
+}
+
+int v4l2_overlay_set_crop(int fd, uint32_t x, uint32_t y, uint32_t w,
+                          uint32_t h)
+{
+    LOG_FUNCTION_NAME
+
+    struct v4l2_crop crop;
+    int ret;
+
+    crop.type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
+    ret = v4l2_overlay_ioctl(fd, VIDIOC_G_CROP, &crop, "get crop");
+    crop.c.left = x;
+    crop.c.top = y;
+    crop.c.width = w;
+    crop.c.height = h;
+    crop.type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
+
+    LOGV("%s:crop.c.left = %d\n", __func__, crop.c.left);
+    LOGV("%s:crop.c.top = %d\n", __func__, crop.c.top);
+    LOGV("%s:crop.c.width = %d\n", __func__, crop.c.width);
+    LOGV("%s:crop.c.height = %d\n", __func__, crop.c.height);
+    LOGV("%s:crop.type = 0x%x\n", __func__, crop.type);
+
+    return v4l2_overlay_ioctl(fd, VIDIOC_S_CROP, &crop, "set crop");
+}
+
+int v4l2_overlay_get_crop(int fd, uint32_t *x, uint32_t *y, uint32_t *w,
+                          uint32_t *h)
+{
+    LOG_FUNCTION_NAME
+
+    struct v4l2_crop crop;
+    int ret;
+
+    crop.type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
+    ret = v4l2_overlay_ioctl(fd, VIDIOC_G_CROP, &crop, "get crop");
+    *x = crop.c.left;
+    *y = crop.c.top;
+    *w = crop.c.width;
+    *h = crop.c.height;
+    return ret;
+}
+
+int v4l2_overlay_set_flip(int fd, int flip)
+{
+    LOG_FUNCTION_NAME
+
+    int ret;
+    struct v4l2_control ctrl_v;
+    struct v4l2_control ctrl_h;
+
+    switch (flip) {
+    case 0:
+        ctrl_v.value = 0;
+        ctrl_h.value = 0;
+        break;
+    case V4L2_CID_HFLIP:
+        ctrl_v.value = 0;
+        ctrl_h.value = 1;
+        break;
+    case V4L2_CID_VFLIP:
+        ctrl_v.value = 1;
+        ctrl_h.value = 0;
+        break;
+    default:
+        return -1;
+    }
+
+    ctrl_v.id = V4L2_CID_VFLIP;
+    ret = v4l2_overlay_ioctl(fd, VIDIOC_S_CTRL, &ctrl_v, "set vflip");
+    if (ret) return ret;
+
+    ctrl_h.id = V4L2_CID_HFLIP;
+    ret = v4l2_overlay_ioctl(fd, VIDIOC_S_CTRL, &ctrl_h, "set hflip");
+    return ret;
+}
+
+int v4l2_overlay_set_rotation(int fd, int degree, int step)
+{
+    LOG_FUNCTION_NAME
+
+    int ret;
+    struct v4l2_control ctrl;
+
+    ctrl.id = V4L2_CID_PRIV_ROTATION;
+    ctrl.value = degree;
+    ret = v4l2_overlay_ioctl(fd, VIDIOC_S_CTRL, &ctrl, "set rotation");
+
+    return ret;
+}
+
+int v4l2_overlay_set_colorkey(int fd, int enable, int colorkey)
+{
+    LOG_FUNCTION_NAME
+
+    int ret;
+    struct v4l2_framebuffer fbuf;
+    struct v4l2_format fmt;
+
+    memset(&fbuf, 0, sizeof(fbuf));
+    ret = v4l2_overlay_ioctl(fd, VIDIOC_G_FBUF, &fbuf,
+                             "get transparency enables");
+
+    if (ret)
+        return ret;
+
+    if (enable)
+        fbuf.flags |= V4L2_FBUF_FLAG_CHROMAKEY;
+    else
+        fbuf.flags &= ~V4L2_FBUF_FLAG_CHROMAKEY;
+
+    ret = v4l2_overlay_ioctl(fd, VIDIOC_S_FBUF, &fbuf, "enable colorkey");
+
+    if (ret)
+        return ret;
+
+    if (enable) {
+        memset(&fmt, 0, sizeof(fmt));
+        fmt.type = V4L2_BUF_TYPE_VIDEO_OVERLAY;
+        ret = v4l2_overlay_ioctl(fd, VIDIOC_G_FMT, &fmt, "get colorkey");
+
+        if (ret)
+            return ret;
+
+        fmt.fmt.win.chromakey = colorkey & 0xFFFFFF;
+
+        ret = v4l2_overlay_ioctl(fd, VIDIOC_S_FMT, &fmt, "set colorkey");
+    }
+
+    return ret;
+}
+
+int v4l2_overlay_set_global_alpha(int fd, int enable, int alpha)
+{
+    LOG_FUNCTION_NAME
+
+    int ret;
+    struct v4l2_framebuffer fbuf;
+    struct v4l2_format fmt;
+
+    memset(&fbuf, 0, sizeof(fbuf));
+    ret = v4l2_overlay_ioctl(fd, VIDIOC_G_FBUF, &fbuf,
+                             "get transparency enables");
+
+    if (ret)
+        return ret;
+
+    if (enable)
+        fbuf.flags |= V4L2_FBUF_FLAG_GLOBAL_ALPHA;
+    else
+        fbuf.flags &= ~V4L2_FBUF_FLAG_GLOBAL_ALPHA;
+
+    ret = v4l2_overlay_ioctl(fd, VIDIOC_S_FBUF, &fbuf, "enable global alpha");
+
+    if (ret)
+        return ret;
+
+    if (enable) {
+        memset(&fmt, 0, sizeof(fmt));
+        fmt.type = V4L2_BUF_TYPE_VIDEO_OVERLAY;
+        ret = v4l2_overlay_ioctl(fd, VIDIOC_G_FMT, &fmt, "get global alpha");
+
+        if (ret)
+            return ret;
+
+        fmt.fmt.win.global_alpha = alpha & 0xFF;
+
+        ret = v4l2_overlay_ioctl(fd, VIDIOC_S_FMT, &fmt, "set global alpha");
+    }
+
+    return ret;
+}
+
+int v4l2_overlay_set_local_alpha(int fd, int enable)
+{
+    int ret;
+    struct v4l2_framebuffer fbuf;
+
+    ret = 0;
+
+    return ret;
+}
+
+int v4l2_overlay_req_buf(int fd, uint32_t *num_bufs, int cacheable_buffers, int zerocopy)
+{
+    struct v4l2_requestbuffers reqbuf;
+    int ret, i;
+
+    reqbuf.type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
+
+    if (zerocopy)
+        reqbuf.memory = V4L2_MEMORY_USERPTR;
+    else
+        reqbuf.memory = V4L2_MEMORY_MMAP;
+    reqbuf.count = *num_bufs;
+
+    ret = ioctl(fd, VIDIOC_REQBUFS, &reqbuf);
+    if (ret < 0) {
+        error(fd, "reqbuf ioctl");
+        return ret;
+    }
+
+    if (reqbuf.count > *num_bufs) {
+        error(fd, "Not enough buffer structs passed to get_buffers");
+        return -ENOMEM;
+    }
+    *num_bufs = reqbuf.count;
+
+    return 0;
+}
+
+static int is_mmaped(struct v4l2_buffer *buf)
+{
+    return buf->flags == V4L2_BUF_FLAG_MAPPED;
+}
+
+static int is_queued(struct v4l2_buffer *buf)
+{
+    /* is either on the input or output queue in the kernel */
+    return (buf->flags & V4L2_BUF_FLAG_QUEUED) ||
+        (buf->flags & V4L2_BUF_FLAG_DONE);
+}
+
+static int is_dequeued(struct v4l2_buffer *buf)
+{
+    /* is on neither input or output queue in kernel */
+    return !(buf->flags & V4L2_BUF_FLAG_QUEUED) &&
+            !(buf->flags & V4L2_BUF_FLAG_DONE);
+}
+
+int v4l2_overlay_query_buffer(int fd, int index, struct v4l2_buffer *buf)
+{
+    LOG_FUNCTION_NAME
+
+    memset(buf, 0, sizeof(struct v4l2_buffer));
+
+    buf->type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
+    buf->memory = V4L2_MEMORY_MMAP;
+    buf->index = index;
+    LOGV("query buffer, mem=%u type=%u index=%u\n",
+         buf->memory, buf->type, buf->index);
+    return v4l2_overlay_ioctl(fd, VIDIOC_QUERYBUF, buf, "querybuf ioctl");
+}
+
+int v4l2_overlay_map_buf(int fd, int index, void **start, size_t *len)
+{
+    LOG_FUNCTION_NAME
+
+    struct v4l2_buffer buf;
+    int ret;
+
+    ret = v4l2_overlay_query_buffer(fd, index, &buf);
+    if (ret)
+        return ret;
+
+    if (is_mmaped(&buf)) {
+        LOGE("Trying to mmap buffers that are already mapped!\n");
+        return -EINVAL;
+    }
+
+    *len = buf.length;
+    *start = mmap(NULL, buf.length, PROT_READ | PROT_WRITE, MAP_SHARED,
+            fd, buf.m.offset);
+    if (*start == MAP_FAILED) {
+        LOGE("map failed, length=%u offset=%u\n", buf.length, buf.m.offset);
+        return -EINVAL;
+    }
+    return 0;
+}
+
+int v4l2_overlay_unmap_buf(void *start, size_t len)
+{
+    LOG_FUNCTION_NAME
+    return munmap(start, len);
+}
+
+
+int v4l2_overlay_get_caps(int fd, struct v4l2_capability *caps)
+{
+    return v4l2_overlay_ioctl(fd, VIDIOC_QUERYCAP, caps, "query cap");
+}
+
+int v4l2_overlay_stream_on(int fd)
+{
+    int ret;
+    uint32_t type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
+
+    ret = v4l2_overlay_set_local_alpha(fd, 1);
+    if (ret)
+        return ret;
+
+    ret = v4l2_overlay_ioctl(fd, VIDIOC_STREAMON, &type, "stream on");
+
+    return ret;
+}
+
+int v4l2_overlay_stream_off(int fd)
+{
+    int ret;
+    uint32_t type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
+
+    ret = v4l2_overlay_set_local_alpha(fd, 0);
+    if (ret)
+        return ret;
+
+    ret = v4l2_overlay_ioctl(fd, VIDIOC_STREAMOFF, &type, "stream off");
+
+    return ret;
+}
+
+int v4l2_overlay_q_buf(int fd, int buffer, int zerocopy)
+{
+    struct v4l2_buffer buf;
+    int ret;
+
+    if (zerocopy) {
+        uint8_t *pPhyYAddr;
+        uint8_t *pPhyCAddr;
+        struct fimc_buf fimc_src_buf;
+        uint8_t index;
+
+        memcpy(&pPhyYAddr, (void *) buffer, sizeof(pPhyYAddr));
+        memcpy(&pPhyCAddr, (void *) (buffer + sizeof(pPhyYAddr)),
+               sizeof(pPhyCAddr));
+        memcpy(&index,
+               (void *) (buffer + sizeof(pPhyYAddr) + sizeof(pPhyCAddr)),
+               sizeof(index));
+
+        fimc_src_buf.base[0] = (dma_addr_t) pPhyYAddr;
+        fimc_src_buf.base[1] = (dma_addr_t) pPhyCAddr;
+        fimc_src_buf.base[2] =
+               (dma_addr_t) (pPhyCAddr + (pPhyCAddr - pPhyYAddr)/4);
+
+        buf.index = index;
+        buf.memory      = V4L2_MEMORY_USERPTR;
+        buf.m.userptr   = (unsigned long)&fimc_src_buf;
+        buf.length      = 0;
+    } else {
+        buf.index = buffer;
+        buf.memory      = V4L2_MEMORY_MMAP;
+    }
+
+    buf.type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
+    buf.field = V4L2_FIELD_NONE;
+    buf.timestamp.tv_sec = 0;
+    buf.timestamp.tv_usec = 0;
+    buf.flags = 0;
+
+    return v4l2_overlay_ioctl(fd, VIDIOC_QBUF, &buf, "qbuf");
+}
+
+int v4l2_overlay_dq_buf(int fd, int *index, int zerocopy)
+{
+    struct v4l2_buffer buf;
+    int ret;
+
+    buf.type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
+
+    if (zerocopy)
+        buf.memory = V4L2_MEMORY_USERPTR;
+    else
+        buf.memory = V4L2_MEMORY_MMAP;
+
+    ret = v4l2_overlay_ioctl(fd, VIDIOC_DQBUF, &buf, "dqbuf");
+    if (ret)
+        return ret;
+    *index = buf.index;
+    return 0;
+}
diff --git a/liboverlay/v4l2_utils.h b/liboverlay/v4l2_utils.h
new file mode 100644
index 0000000..02797c3
--- /dev/null
+++ b/liboverlay/v4l2_utils.h
@@ -0,0 +1,75 @@
+/*
+ * Copyright 2009 Google Inc. All Rights Reserved.
+ * Author: rschultz@google.com (Rebecca Schultz Zavin)
+ */
+
+#ifndef ANDROID_ZOOM_REPO_HARDWARE_SEC_LIBOVERLAY_V4L2_UTILS_H_
+#define ANDROID_ZOOM_REPO_HARDWARE_SEC_LIBOVERLAY_V4L2_UTILS_H_
+
+#include "s5p_fimc.h"
+
+int v4l2_overlay_open(int id);
+int v4l2_overlay_get_caps(int fd, struct v4l2_capability *caps);
+int v4l2_overlay_req_buf(int fd, uint32_t *num_bufs, int cacheable_buffers,
+                         int zerocopy);
+int v4l2_overlay_query_buffer(int fd, int index, struct v4l2_buffer *buf);
+int v4l2_overlay_map_buf(int fd, int index, void **start, size_t *len);
+int v4l2_overlay_unmap_buf(void *start, size_t len);
+int v4l2_overlay_stream_on(int fd);
+int v4l2_overlay_stream_off(int fd);
+int v4l2_overlay_q_buf(int fd, int index, int zerocopy);
+int v4l2_overlay_dq_buf(int fd, int *index, int zerocopy);
+int v4l2_overlay_init(int fd, uint32_t w, uint32_t h, uint32_t fmt,
+                      uint32_t addr);
+int v4l2_overlay_get_input_size(int fd, uint32_t *w, uint32_t *h,
+                                uint32_t *fmt);
+int v4l2_overlay_set_position(int fd, int32_t x, int32_t y, int32_t w,
+        int32_t h, int rotation);
+int v4l2_overlay_get_position(int fd, int32_t *x, int32_t *y, int32_t *w,
+        int32_t *h);
+int v4l2_overlay_set_crop(int fd, uint32_t x, uint32_t y, uint32_t w,
+        uint32_t h);
+int v4l2_overlay_get_crop(int fd, uint32_t *x, uint32_t *y, uint32_t *w,
+        uint32_t *h);
+int v4l2_overlay_set_flip(int fd, int degree);
+int v4l2_overlay_set_rotation(int fd, int degree, int step);
+int v4l2_overlay_set_colorkey(int fd, int enable, int colorkey);
+int v4l2_overlay_set_global_alpha(int fd, int enable, int alpha);
+int v4l2_overlay_set_local_alpha(int fd, int enable);
+int v4l2_overlay_init_fimc(int fd, s5p_fimc_t *s5p_fimc);
+int v4l2_overlay_s_fbuf(int fd, int rotation);
+
+enum {
+    V4L2_OVERLAY_PLANE_GRAPHICS,
+    V4L2_OVERLAY_PLANE_VIDEO1,
+    V4L2_OVERLAY_PLANE_VIDEO2,
+};
+
+enum {
+    /* support customed format for zero copy */
+    HAL_PIXEL_FORMAT_YCbCr_420_SP = 0x21,
+    HAL_PIXEL_FORMAT_YCbCr_420_P = 0x13,
+    HAL_PIXEL_FORMAT_CUSTOM_YCbCr_420_SP = 0x100,
+    HAL_PIXEL_FORMAT_CUSTOM_YCbCr_422_I = 0x101,
+    HAL_PIXEL_FORMAT_CUSTOM_CbYCrY_422_I = 0x102,
+    HAL_PIXEL_FORMAT_CUSTOM_YCrCb_420_SP = 0x103,
+    HAL_PIXEL_FORMAT_CUSTOM_MAX
+};
+
+enum {
+    PFT_RGB,
+    PFT_YUV420,
+    PFT_YUV422,
+    PFT_YUV444,
+};
+
+struct mapping_data {
+    int fd;
+    size_t length;
+    uint32_t offset;
+    void *ptr;
+};
+
+#define ALL_BUFFERS_FLUSHED -66
+
+#endif  /* ANDROID_ZOOM_REPO_HARDWARE_SEC_LIBOVERLAY_V4L2_UTILS_H_*/