/*
Copyright (c) 2011-2012,2015, The Linux Foundation. All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:
    * Redistributions of source code must retain the above copyright
      notice, this list of conditions and the following disclaimer.
    * Redistributions in binary form must reproduce the above
      copyright notice, this list of conditions and the following
      disclaimer in the documentation and/or other materials provided
      with the distribution.
    * Neither the name of The Linux Foundation nor the names of its
      contributors may be used to endorse or promote products derived
      from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/

#include <pthread.h>
#include "mm_camera_dbg.h"
#include <errno.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stddef.h>
#include <poll.h>
#include <linux/media.h>

#include "mm_camera_interface2.h"
#include "mm_camera.h"

#define SET_PARM_BIT32(parm, parm_arr) \
    (parm_arr[parm/32] |= (1<<(parm%32)))

#define GET_PARM_BIT32(parm, parm_arr) \
    ((parm_arr[parm/32]>>(parm%32))& 0x1)

static pthread_mutex_t g_mutex = PTHREAD_MUTEX_INITIALIZER;

static mm_camera_ctrl_t g_cam_ctrl;

static int mm_camera_util_opcode_2_ch_type(mm_camera_obj_t *my_obj,
                                        mm_camera_ops_type_t opcode)
{
    switch(opcode) {
    case MM_CAMERA_OPS_PREVIEW:
        return MM_CAMERA_CH_PREVIEW;
    case MM_CAMERA_OPS_ZSL:
    case MM_CAMERA_OPS_SNAPSHOT:
        return MM_CAMERA_CH_SNAPSHOT;
    case MM_CAMERA_OPS_PREPARE_SNAPSHOT:
        return MM_CAMERA_CH_SNAPSHOT;
    case MM_CAMERA_OPS_RAW:
        return MM_CAMERA_CH_RAW;
    default:
        break;
    }
    return -1;
}

const char *mm_camera_util_get_dev_name(mm_camera_obj_t * my_obj)
{
    CDBG("%s: Returning %s at index :%d\n",
        __func__,g_cam_ctrl.camera[my_obj->my_id].video_dev_name,my_obj->my_id);
    return g_cam_ctrl.camera[my_obj->my_id].video_dev_name;
}

/* used for querying the camera_info of the given camera_id */
static const qcamera_info_t * mm_camera_cfg_query_camera_info (int8_t camera_id)
{
    if(camera_id >= MSM_MAX_CAMERA_SENSORS)
        return NULL;
    return &g_cam_ctrl.camera[camera_id].camera_info;
}
/* check if the parm is supported */
static uint8_t mm_camera_cfg_is_parm_supported (mm_camera_t * camera,
                                                mm_camera_parm_type_t parm_type)
{
    int is_parm_supported = 0;
    mm_camera_obj_t * my_obj = NULL;

    pthread_mutex_lock(&g_mutex);
    my_obj = g_cam_ctrl.cam_obj[camera->camera_info.camera_id];
    pthread_mutex_unlock(&g_mutex);
    if(my_obj) {
        pthread_mutex_lock(&my_obj->mutex);
        is_parm_supported = GET_PARM_BIT32(parm_type,
                                           my_obj->properties.parm);
        pthread_mutex_unlock(&my_obj->mutex);
    }

    return is_parm_supported;
}

/* check if the channel is supported */
static uint8_t mm_camera_cfg_is_ch_supported (mm_camera_t * camera,
                                  mm_camera_channel_type_t ch_type)
{
    switch(ch_type) {
    case MM_CAMERA_CH_PREVIEW:
    case MM_CAMERA_CH_VIDEO:
    case MM_CAMERA_CH_SNAPSHOT:
    case MM_CAMERA_CH_RAW:
        return TRUE;
    case MM_CAMERA_CH_MAX:
    default:
        return FALSE;
    }
    return FALSE;
}

/* set a parm’s current value */
static int32_t mm_camera_cfg_set_parm (mm_camera_t * camera,
                                       mm_camera_parm_type_t parm_type,
                                       void *p_value)
{
    int32_t rc = -MM_CAMERA_E_GENERAL;
    uint32_t tmp;
    mm_camera_obj_t * my_obj = NULL;
    mm_camera_parm_t parm = {.parm_type = parm_type, .p_value = p_value};

    pthread_mutex_lock(&g_mutex);
    my_obj = g_cam_ctrl.cam_obj[camera->camera_info.camera_id];
    pthread_mutex_unlock(&g_mutex);
    if(my_obj) {
        pthread_mutex_lock(&my_obj->mutex);
        rc = mm_camera_set_parm(my_obj, &parm);
        pthread_mutex_unlock(&my_obj->mutex);
    }
    return rc;
}

/* get a parm’s current value */
static int32_t mm_camera_cfg_get_parm (mm_camera_t * camera,
                                       mm_camera_parm_type_t parm_type,
                                       void* p_value)
{
    int32_t rc = -MM_CAMERA_E_GENERAL;
    uint32_t tmp;
    mm_camera_obj_t * my_obj = NULL;
    mm_camera_parm_t parm = {.parm_type = parm_type, .p_value = p_value};

    pthread_mutex_lock(&g_mutex);
    my_obj = g_cam_ctrl.cam_obj[camera->camera_info.camera_id];
    pthread_mutex_unlock(&g_mutex);
    if(my_obj) {
        pthread_mutex_lock(&my_obj->mutex);
        rc =  mm_camera_get_parm(my_obj, &parm);
        pthread_mutex_unlock(&my_obj->mutex);
    }
    return rc;
}

static int32_t mm_camera_cfg_request_buf(mm_camera_t * camera,
                                         mm_camera_reg_buf_t *buf)
{
    int32_t rc = -MM_CAMERA_E_GENERAL;
    uint32_t tmp;
    mm_camera_obj_t * my_obj = NULL;

    pthread_mutex_lock(&g_mutex);
    my_obj = g_cam_ctrl.cam_obj[camera->camera_info.camera_id];
    pthread_mutex_unlock(&g_mutex);
    if(my_obj) {
        pthread_mutex_lock(&my_obj->mutex);
        rc =  mm_camera_request_buf(my_obj, buf);
        pthread_mutex_unlock(&my_obj->mutex);
    }
    return rc;
}

static int32_t mm_camera_cfg_prepare_buf(mm_camera_t * camera,
                                         mm_camera_reg_buf_t *buf)
{
    int32_t rc = -MM_CAMERA_E_GENERAL;
    uint32_t tmp;
    mm_camera_obj_t * my_obj = NULL;

    pthread_mutex_lock(&g_mutex);
    my_obj = g_cam_ctrl.cam_obj[camera->camera_info.camera_id];
    pthread_mutex_unlock(&g_mutex);
    if(my_obj) {
        pthread_mutex_lock(&my_obj->mutex);
        rc =  mm_camera_prepare_buf(my_obj, buf);
        pthread_mutex_unlock(&my_obj->mutex);
    }
    return rc;
}
static int32_t mm_camera_cfg_unprepare_buf(mm_camera_t * camera,
                                           mm_camera_channel_type_t ch_type)
{
    int32_t rc = -MM_CAMERA_E_GENERAL;
    uint32_t tmp;
    mm_camera_obj_t * my_obj = NULL;

    pthread_mutex_lock(&g_mutex);
    my_obj = g_cam_ctrl.cam_obj[camera->camera_info.camera_id];
    pthread_mutex_unlock(&g_mutex);
    if(my_obj) {
        pthread_mutex_lock(&my_obj->mutex);
        rc =  mm_camera_unprepare_buf(my_obj,ch_type);
        pthread_mutex_unlock(&my_obj->mutex);
    }
    return rc;
}

static mm_camera_config_t mm_camera_cfg = {
  .is_parm_supported = mm_camera_cfg_is_parm_supported,
  .is_ch_supported = mm_camera_cfg_is_ch_supported,
  .set_parm = mm_camera_cfg_set_parm,
  .get_parm = mm_camera_cfg_get_parm,
  .request_buf = mm_camera_cfg_request_buf,
  .prepare_buf = mm_camera_cfg_prepare_buf,
  .unprepare_buf = mm_camera_cfg_unprepare_buf
};

static uint8_t mm_camera_ops_is_op_supported (mm_camera_t * camera,
                                              mm_camera_ops_type_t opcode)
{
    uint8_t is_ops_supported;
    mm_camera_obj_t * my_obj = NULL;
    int index = 0;
    mm_camera_legacy_ops_type_t legacy_opcode = CAMERA_OPS_MAX;

    /* Temp: We will be translating our new opcode
       to legacy ops type. This is just a hack to
       temporarily unblock APT team. New design is
       under discussion */
    switch (opcode) {
    case MM_CAMERA_OPS_PREVIEW:
        legacy_opcode = CAMERA_OPS_STREAMING_PREVIEW;
        break;
    case MM_CAMERA_OPS_VIDEO:
        legacy_opcode = CAMERA_OPS_STREAMING_VIDEO;
        break;
    case MM_CAMERA_OPS_PREPARE_SNAPSHOT:
        legacy_opcode = CAMERA_OPS_PREPARE_SNAPSHOT;
        break;
    case MM_CAMERA_OPS_SNAPSHOT:
        legacy_opcode = CAMERA_OPS_SNAPSHOT;
        break;
    case MM_CAMERA_OPS_RAW:
        legacy_opcode = CAMERA_OPS_RAW_CAPTURE;
        break;
    case MM_CAMERA_OPS_ZSL:
        legacy_opcode = CAMERA_OPS_STREAMING_ZSL;
        break;
    case MM_CAMERA_OPS_FOCUS:
        legacy_opcode = CAMERA_OPS_FOCUS;
        break;
    case MM_CAMERA_OPS_GET_BUFFERED_FRAME:
      legacy_opcode = CAMERA_OPS_LOCAL;
      is_ops_supported = TRUE;
      CDBG("MM_CAMERA_OPS_GET_BUFFERED_FRAME not handled");
      break;
    default:
      CDBG_ERROR("%s: case %d not handled", __func__, opcode);
      legacy_opcode = CAMERA_OPS_LOCAL;
      is_ops_supported = FALSE;
      break;
    }
    if (legacy_opcode != CAMERA_OPS_LOCAL) {
    pthread_mutex_lock(&g_mutex);
    my_obj = g_cam_ctrl.cam_obj[camera->camera_info.camera_id];
    pthread_mutex_unlock(&g_mutex);
    if(my_obj) {
        pthread_mutex_lock(&my_obj->mutex);
        index = legacy_opcode/32;  /* 32 bits */
        is_ops_supported = ((my_obj->properties.ops[index] &
            (1<<legacy_opcode)) != 0);
        pthread_mutex_unlock(&my_obj->mutex);
      } else {
        is_ops_supported = FALSE;
      }
    }

    return is_ops_supported;
}

static int32_t mm_camera_ops_action (mm_camera_t * camera, uint8_t start,
                                    mm_camera_ops_type_t opcode, void *val)
{
    int32_t rc = -MM_CAMERA_E_GENERAL;
    mm_camera_obj_t * my_obj = NULL;
    pthread_mutex_lock(&g_mutex);
    my_obj = g_cam_ctrl.cam_obj[camera->camera_info.camera_id];
    pthread_mutex_unlock(&g_mutex);
    if(my_obj) {
        pthread_mutex_lock(&my_obj->mutex);
        rc = mm_camera_action(my_obj, start, opcode, val);
        pthread_mutex_unlock(&my_obj->mutex);
    }
    return rc;
}

/* open uses flags to optionally disable jpeg/vpe interface. */
static int32_t mm_camera_ops_open (mm_camera_t * camera,
                                   mm_camera_op_mode_type_t op_mode)
{
    int8_t camera_id = camera->camera_info.camera_id;
    int32_t rc = MM_CAMERA_OK;

    CDBG("%s: BEGIN\n", __func__);
    pthread_mutex_lock(&g_mutex);
    /* not first open */
    if(g_cam_ctrl.cam_obj[camera_id]) {
        g_cam_ctrl.cam_obj[camera_id]->ref_count++;
    CDBG("%s:  opened alreadyn", __func__);
        goto end;
    }
    g_cam_ctrl.cam_obj[camera_id] =
    (mm_camera_obj_t *)malloc(sizeof(mm_camera_obj_t));
    if(!g_cam_ctrl.cam_obj[camera_id]) {
        rc = -MM_CAMERA_E_NO_MEMORY;
     CDBG("%s:  no mem", __func__);
       goto end;
    }
    memset(g_cam_ctrl.cam_obj[camera_id], 0,
                 sizeof(mm_camera_obj_t));
    //g_cam_ctrl.cam_obj[camera_id]->ctrl_fd = -1;
    g_cam_ctrl.cam_obj[camera_id]->ref_count++;
    g_cam_ctrl.cam_obj[camera_id]->my_id=camera_id;

    pthread_mutex_init(&g_cam_ctrl.cam_obj[camera_id]->mutex, NULL);
    rc = mm_camera_open(g_cam_ctrl.cam_obj[camera_id], op_mode);
    if(rc < 0) {
        CDBG("%s: open failed, rc = %d\n", __func__, rc);
        pthread_mutex_destroy(&g_cam_ctrl.cam_obj[camera_id]->mutex);
        g_cam_ctrl.cam_obj[camera_id]->ref_count--;
        free(g_cam_ctrl.cam_obj[camera_id]);
        g_cam_ctrl.cam_obj[camera_id]=NULL;
    CDBG("%s: mm_camera_open err = %d", __func__, rc);
        goto end;
    }else{
        CDBG("%s: open succeded\n", __func__);
    }
end:
    pthread_mutex_unlock(&g_mutex);
    CDBG("%s: END, rc=%d\n", __func__, rc);
    return rc;
}

static void mm_camera_ops_close (mm_camera_t * camera)
{
    mm_camera_obj_t * my_obj;
    int i;
    int8_t camera_id = camera->camera_info.camera_id;

    pthread_mutex_lock(&g_mutex);
    my_obj = g_cam_ctrl.cam_obj[camera_id];
    if(my_obj) {
      my_obj->ref_count--;
      if(my_obj->ref_count > 0) {
        CDBG("%s: ref_count=%d\n", __func__, my_obj->ref_count);
      } else {
        // mm_camera_poll_thread_release(my_obj, MM_CAMERA_CH_MAX);
        (void)mm_camera_close(g_cam_ctrl.cam_obj[camera_id]);
        pthread_mutex_destroy(&my_obj->mutex);
        free(my_obj);
        g_cam_ctrl.cam_obj[camera_id] = NULL;
      }
    }
    pthread_mutex_unlock(&g_mutex);
}

static void mm_camera_ops_stop (mm_camera_t * camera)
{
    mm_camera_obj_t * my_obj;
    int i;
    int8_t camera_id = camera->camera_info.camera_id;

    pthread_mutex_lock(&g_mutex);
    my_obj = g_cam_ctrl.cam_obj[camera_id];
    if(my_obj) {
        CDBG("%s : Close Threads in mm_camera_ops_stop",__func__);
        for(i = 0; i <= MM_CAMERA_CH_MAX; i++) {
            mm_camera_poll_thread_release(my_obj,(mm_camera_channel_type_t)i);
        }
        mm_camera_poll_threads_deinit(my_obj);
    }
    pthread_mutex_unlock(&g_mutex);
}


static int32_t mm_camera_ops_ch_acquire(mm_camera_t * camera,
                                        mm_camera_channel_type_t ch_type)
{
    int32_t rc = -MM_CAMERA_E_GENERAL;
    mm_camera_obj_t * my_obj = NULL;
    pthread_mutex_lock(&g_mutex);
    my_obj = g_cam_ctrl.cam_obj[camera->camera_info.camera_id];
    pthread_mutex_unlock(&g_mutex);
    if(my_obj) {
        pthread_mutex_lock(&my_obj->mutex);
        rc = mm_camera_ch_acquire(my_obj, ch_type);
        pthread_mutex_unlock(&my_obj->mutex);
    }
    return rc;

}
static void mm_camera_ops_ch_release(mm_camera_t * camera, mm_camera_channel_type_t ch_type)
{
    mm_camera_obj_t * my_obj = NULL;
    pthread_mutex_lock(&g_mutex);
    my_obj = g_cam_ctrl.cam_obj[camera->camera_info.camera_id];
    pthread_mutex_unlock(&g_mutex);
    if(my_obj) {
        pthread_mutex_lock(&my_obj->mutex);
        mm_camera_ch_release(my_obj, ch_type);
        pthread_mutex_unlock(&my_obj->mutex);
    }
}

static int32_t mm_camera_ops_ch_attr(mm_camera_t * camera,
                                     mm_camera_channel_type_t ch_type,
                                     mm_camera_channel_attr_t *attr)
{
    mm_camera_obj_t * my_obj = NULL;
    int32_t rc = -MM_CAMERA_E_GENERAL;
    pthread_mutex_lock(&g_mutex);
    my_obj = g_cam_ctrl.cam_obj[camera->camera_info.camera_id];
    pthread_mutex_unlock(&g_mutex);
    if(my_obj) {
        pthread_mutex_lock(&my_obj->mutex);
        rc = mm_camera_ch_fn(my_obj, ch_type, MM_CAMERA_STATE_EVT_ATTR,
                            (void *)attr);
        pthread_mutex_unlock(&my_obj->mutex);
    }
    return rc;
}

static int32_t mm_camera_ops_sendmsg(mm_camera_t * camera,
                                     void *msg,
                                     uint32_t buf_size,
                                     int sendfd)
{
    int32_t rc = -MM_CAMERA_E_GENERAL;
    mm_camera_obj_t * my_obj = NULL;
    pthread_mutex_lock(&g_mutex);
    my_obj = g_cam_ctrl.cam_obj[camera->camera_info.camera_id];
    pthread_mutex_unlock(&g_mutex);
    if(my_obj) {
        pthread_mutex_lock(&my_obj->mutex);
        rc = mm_camera_sendmsg(my_obj, msg, buf_size, sendfd);
        pthread_mutex_unlock(&my_obj->mutex);
    }
    return rc;
}

static mm_camera_ops_t mm_camera_ops = {
  .is_op_supported = mm_camera_ops_is_op_supported,
    .action = mm_camera_ops_action,
    .open = mm_camera_ops_open,
    .close = mm_camera_ops_close,
    .stop = mm_camera_ops_stop,
    .ch_acquire = mm_camera_ops_ch_acquire,
    .ch_release = mm_camera_ops_ch_release,
    .ch_set_attr = mm_camera_ops_ch_attr,
    .sendmsg = mm_camera_ops_sendmsg
};

static uint8_t mm_camera_notify_is_event_supported(mm_camera_t * camera,
                                mm_camera_event_type_t evt_type)
{
  switch(evt_type) {
  case MM_CAMERA_EVT_TYPE_CH:
  case MM_CAMERA_EVT_TYPE_CTRL:
  case MM_CAMERA_EVT_TYPE_STATS:
  case MM_CAMERA_EVT_TYPE_INFO:
    return 1;
  default:
    return 0;
  }
  return 0;
}

static int32_t mm_camera_notify_register_event_cb(mm_camera_t * camera,
                                   mm_camera_event_notify_t evt_cb,
                                    void * user_data,
                                   mm_camera_event_type_t evt_type)
{
  mm_camera_obj_t * my_obj = NULL;
  mm_camera_buf_cb_t reg ;
  int rc = -1;

  pthread_mutex_lock(&g_mutex);
  my_obj = g_cam_ctrl.cam_obj[camera->camera_info.camera_id];
  pthread_mutex_unlock(&g_mutex);
  if(my_obj) {
      pthread_mutex_lock(&my_obj->mutex);
      rc = mm_camera_reg_event(my_obj, evt_cb, user_data, evt_type);
      pthread_mutex_unlock(&my_obj->mutex);
  }
  return rc;
}

static int32_t mm_camera_register_buf_notify (
          mm_camera_t * camera,
          mm_camera_channel_type_t ch_type,
          mm_camera_buf_notify_t  buf_cb,
          mm_camera_register_buf_cb_type_t cb_type,
          uint32_t cb_count,
          void * user_data)
{
    mm_camera_obj_t * my_obj = NULL;
    mm_camera_buf_cb_t reg ;
    int rc = -1;

    reg.cb = buf_cb;
    reg.user_data = user_data;
    reg.cb_type=cb_type;
    reg.cb_count=cb_count;
    pthread_mutex_lock(&g_mutex);
    my_obj = g_cam_ctrl.cam_obj[camera->camera_info.camera_id];
    pthread_mutex_unlock(&g_mutex);
    if(my_obj) {
        pthread_mutex_lock(&my_obj->mutex);
        rc = mm_camera_ch_fn(my_obj,ch_type,
                            MM_CAMERA_STATE_EVT_REG_BUF_CB, (void *)&reg);
        pthread_mutex_unlock(&my_obj->mutex);
    }
    return rc;
}
static int32_t mm_camera_buf_done(mm_camera_t * camera, mm_camera_ch_data_buf_t * bufs)
{
    mm_camera_obj_t * my_obj = NULL;
    int rc = -1;
    my_obj = g_cam_ctrl.cam_obj[camera->camera_info.camera_id];
    if(my_obj) {
        /*pthread_mutex_lock(&my_obj->mutex);*/
        rc = mm_camera_ch_fn(my_obj, bufs->type,
                 MM_CAMERA_STATE_EVT_QBUF,   (void *)bufs);
        /*pthread_mutex_unlock(&my_obj->mutex);*/
    }
    return rc;
}

static mm_camera_notify_t mm_camera_notify = {
    .is_event_supported = mm_camera_notify_is_event_supported,
    .register_event_notify = mm_camera_notify_register_event_cb,
    .register_buf_notify = mm_camera_register_buf_notify,
    .buf_done = mm_camera_buf_done
};

static uint8_t mm_camera_jpeg_is_jpeg_supported (mm_camera_t * camera)
{
    return FALSE;
}
static int32_t mm_camera_jpeg_set_parm (mm_camera_t * camera,
                    mm_camera_jpeg_parm_type_t parm_type,
                    void* p_value)
{
    return -1;
}
static int32_t mm_camera_jpeg_get_parm (mm_camera_t * camera,
                    mm_camera_jpeg_parm_type_t parm_type,
                    void* p_value)
{
    return -1;
}
static int32_t mm_camera_jpeg_register_event_cb(mm_camera_t * camera,
                    mm_camera_jpeg_cb_t * evt_cb,
                    void * user_data)
{
    return -1;
}
static int32_t mm_camera_jpeg_encode (mm_camera_t * camera, uint8_t start,
                    mm_camera_jpeg_encode_t *data)
{
    return -1;
}

static mm_camera_jpeg_t mm_camera_jpeg =  {
    .is_jpeg_supported = mm_camera_jpeg_is_jpeg_supported,
    .set_parm = mm_camera_jpeg_set_parm,
    .get_parm = mm_camera_jpeg_get_parm,
    .register_event_cb = mm_camera_jpeg_register_event_cb,
    .encode = mm_camera_jpeg_encode,
};

extern mm_camera_t * mm_camera_query (uint8_t *num_cameras)
{
    int i = 0, rc = MM_CAMERA_OK;
    int dev_fd = 0;
    struct media_device_info mdev_info;
    int num_media_devices = 0;
    if (!num_cameras)
      return NULL;
    /* lock the mutex */
    pthread_mutex_lock(&g_mutex);
    *num_cameras = 0;
    while (1) {
      char dev_name[32];
      snprintf(dev_name, sizeof(dev_name), "/dev/media%d", num_media_devices);
      dev_fd = open(dev_name, O_RDWR | O_NONBLOCK);
      if (dev_fd < 0) {
        CDBG("Done discovering media devices\n");
        break;
      }
      num_media_devices++;
      rc = ioctl(dev_fd, MEDIA_IOC_DEVICE_INFO, &mdev_info);
      if (rc < 0) {
        CDBG_ERROR("Error: ioctl media_dev failed: %s\n", strerror(errno));
        close(dev_fd);
        break;
      }

      if(strncmp(mdev_info.model, QCAMERA_NAME, sizeof(mdev_info.model) != 0)) {
        close(dev_fd);
        continue;
      }

      char * mdev_cfg;
      int cam_type = 0, mount_angle = 0, info_index = 0;
      mdev_cfg = strtok(mdev_info.serial, "-");
      while(mdev_cfg != NULL) {
          if(info_index == 0) {
              if(strcmp(mdev_cfg, QCAMERA_NAME))
                  break;
          } else if(info_index == 1) {
              mount_angle = atoi(mdev_cfg);
          } else if(info_index == 2) {
              cam_type = atoi(mdev_cfg);
          }
          mdev_cfg = strtok(NULL, "-");
          info_index++;
      }

      if(info_index == 0) {
          close(dev_fd);
          continue;
      }

      int num_entities = 1;
      while (1) {
        struct media_entity_desc entity;
        memset(&entity, 0, sizeof(entity));
        entity.id = num_entities++;
        rc = ioctl(dev_fd, MEDIA_IOC_ENUM_ENTITIES, &entity);
        if (rc < 0) {
            CDBG("Done enumerating media entities\n");
            rc = 0;
            break;
        }
        if(entity.type == MEDIA_ENT_T_DEVNODE_V4L && entity.group_id == QCAMERA_VNODE_GROUP_ID) {
             strncpy(g_cam_ctrl.camera[*num_cameras].video_dev_name,
                     entity.name, sizeof(entity.name));
             break;
        }
      }

      g_cam_ctrl.camera[*num_cameras].camera_info.camera_id = *num_cameras;

      g_cam_ctrl.camera[*num_cameras].
          camera_info.modes_supported = CAMERA_MODE_2D;
      if(cam_type > 1)
        g_cam_ctrl.camera[*num_cameras].
          camera_info.modes_supported |= CAMERA_MODE_3D;

      g_cam_ctrl.camera[*num_cameras].camera_info.position =
        (cam_type == 1) ? FRONT_CAMERA : BACK_CAMERA;
      g_cam_ctrl.camera[*num_cameras].camera_info.sensor_mount_angle =
          mount_angle;
      g_cam_ctrl.camera[*num_cameras].sensor_type = 0;
      g_cam_ctrl.camera[*num_cameras].cfg = &mm_camera_cfg;
      g_cam_ctrl.camera[*num_cameras].ops = &mm_camera_ops;
      g_cam_ctrl.camera[*num_cameras].evt = &mm_camera_notify;
      g_cam_ctrl.camera[*num_cameras].jpeg_ops = NULL;

      CDBG("%s: dev_info[id=%d,name='%s',pos=%d,modes=0x%x,sensor=%d]\n",
        __func__, *num_cameras,
        g_cam_ctrl.camera[*num_cameras].video_dev_name,
        g_cam_ctrl.camera[*num_cameras].camera_info.position,
        g_cam_ctrl.camera[*num_cameras].camera_info.modes_supported,
        g_cam_ctrl.camera[*num_cameras].sensor_type);

      *num_cameras+=1;
      if (dev_fd > 0) {
          close(dev_fd);
      }
    }
    *num_cameras = *num_cameras;
    g_cam_ctrl.num_cam = *num_cameras;
end:
    /* unlock the mutex */
    pthread_mutex_unlock(&g_mutex);
    CDBG("%s: num_cameras=%d\n", __func__, g_cam_ctrl.num_cam);
    if(rc == 0)
        return &g_cam_ctrl.camera[0];
    else
        return NULL;
}


static mm_camera_t * get_camera_by_id( int cam_id)
{
  mm_camera_t * mm_cam;
  if( cam_id < 0 || cam_id >= g_cam_ctrl.num_cam) {
     mm_cam = NULL;
  } else {
    mm_cam = & g_cam_ctrl.camera[cam_id];
  }
  return mm_cam;
}

/*configure methods*/
uint8_t cam_config_is_parm_supported(
  int cam_id,
  mm_camera_parm_type_t parm_type)
{
  uint8_t rc = 0;
  mm_camera_t * mm_cam = get_camera_by_id(cam_id);
  if (mm_cam && mm_cam->cfg) {
    rc = mm_cam->cfg->is_parm_supported(mm_cam, parm_type);
  }
  return rc;
}

uint8_t cam_config_is_ch_supported(
  int cam_id,
  mm_camera_channel_type_t ch_type)
{
  uint8_t rc = 0;
  mm_camera_t * mm_cam = get_camera_by_id(cam_id);
  if (mm_cam) {
    rc = mm_cam->cfg->is_ch_supported(mm_cam, ch_type);
  }
  return rc;

}

/* set a parm’s current value */
int32_t cam_config_set_parm(
  int cam_id,
  mm_camera_parm_type_t parm_type,
  void* p_value)
{
  int32_t rc = -1;
  mm_camera_t * mm_cam = get_camera_by_id(cam_id);
  if (mm_cam) {
    rc = mm_cam->cfg->set_parm(mm_cam, parm_type, p_value);
  }
  return rc;
}

/* get a parm’s current value */
int32_t cam_config_get_parm(
  int cam_id,
  mm_camera_parm_type_t parm_type,
  void* p_value)
{
  int32_t rc = -1;
  mm_camera_t * mm_cam = get_camera_by_id(cam_id);
  if (mm_cam) {
    rc = mm_cam->cfg->get_parm(mm_cam, parm_type, p_value);
  }
  return rc;
}

int32_t cam_config_request_buf(int cam_id, mm_camera_reg_buf_t *buf)
{

  int32_t rc = -1;
  mm_camera_t * mm_cam = get_camera_by_id(cam_id);
  if (mm_cam) {
    rc = mm_cam->cfg->request_buf(mm_cam, buf);
  }
  return rc;
}

int32_t cam_config_prepare_buf(int cam_id, mm_camera_reg_buf_t *buf)
{

  int32_t rc = -1;
  mm_camera_t * mm_cam = get_camera_by_id(cam_id);
  if (mm_cam) {
    rc = mm_cam->cfg->prepare_buf(mm_cam, buf);
  }
  return rc;
}
int32_t cam_config_unprepare_buf(int cam_id, mm_camera_channel_type_t ch_type)
{
  int32_t rc = -1;
  mm_camera_t * mm_cam = get_camera_by_id(cam_id);
  if (mm_cam) {
    rc = mm_cam->cfg->unprepare_buf(mm_cam, ch_type);
  }
  return rc;
}

/*operation methods*/
uint8_t cam_ops_is_op_supported(int cam_id, mm_camera_ops_type_t opcode)
{
  uint8_t rc = 0;
  mm_camera_t * mm_cam = get_camera_by_id(cam_id);
  if (mm_cam) {
    rc = mm_cam->ops->is_op_supported(mm_cam, opcode);
  }
  return rc;
}
/* val is reserved for some action such as MM_CAMERA_OPS_FOCUS */
int32_t cam_ops_action(int cam_id, uint8_t start,
  mm_camera_ops_type_t opcode, void *val)
{
  int32_t rc = -1;
  mm_camera_t * mm_cam = get_camera_by_id(cam_id);
  if (mm_cam) {
    rc = mm_cam->ops->action(mm_cam, start, opcode, val);
  }
  return rc;
}

int32_t cam_ops_open(int cam_id, mm_camera_op_mode_type_t op_mode)
{
  int32_t rc = -1;
  mm_camera_t * mm_cam = get_camera_by_id(cam_id);
  if (mm_cam) {
    rc = mm_cam->ops->open(mm_cam, op_mode);
  }
  return rc;
}

void cam_ops_close(int cam_id)
{
  mm_camera_t * mm_cam = get_camera_by_id(cam_id);
  if (mm_cam) {
    mm_cam->ops->close(mm_cam);
  }
}

void cam_ops_stop(int cam_id)
{
  mm_camera_t * mm_cam = get_camera_by_id(cam_id);
  if (mm_cam) {
    mm_cam->ops->stop(mm_cam);
  }
}

int32_t cam_ops_ch_acquire(int cam_id, mm_camera_channel_type_t ch_type)
{
  int32_t rc = -1;
  mm_camera_t * mm_cam = get_camera_by_id(cam_id);
  if (mm_cam) {
    rc = mm_cam->ops->ch_acquire(mm_cam, ch_type);
  }
  return rc;
}

void cam_ops_ch_release(int cam_id, mm_camera_channel_type_t ch_type)
{
  mm_camera_t * mm_cam = get_camera_by_id(cam_id);
  if (mm_cam) {
    mm_cam->ops->ch_release(mm_cam, ch_type);
  }
}

int32_t cam_ops_ch_set_attr(int cam_id, mm_camera_channel_type_t ch_type,
  mm_camera_channel_attr_t *attr)
{
  int32_t rc = -1;
  mm_camera_t * mm_cam = get_camera_by_id(cam_id);
  if (mm_cam) {
    rc = mm_cam->ops->ch_set_attr(mm_cam, ch_type, attr);
  }
  return rc;
}

int32_t cam_ops_sendmsg(int cam_id, void *msg, uint32_t buf_size, int sendfd)
{
    int32_t rc = -1;
    mm_camera_t * mm_cam = get_camera_by_id(cam_id);
    if (mm_cam) {
      rc = mm_cam->ops->sendmsg(mm_cam, msg, buf_size, sendfd);
    }
    return rc;
}

/*call-back notify methods*/
uint8_t cam_evt_is_event_supported(int cam_id, mm_camera_event_type_t evt_type)
{
  uint8_t rc = 0;
  mm_camera_t * mm_cam = get_camera_by_id(cam_id);
  if (mm_cam) {
    rc = mm_cam->evt->is_event_supported(mm_cam, evt_type);
  }
  return rc;
}

int32_t cam_evt_register_event_notify(int cam_id,
  mm_camera_event_notify_t evt_cb,
  void * user_data,
  mm_camera_event_type_t evt_type)
{
  int32_t rc = -1;
  mm_camera_t * mm_cam = get_camera_by_id(cam_id);
  if (mm_cam) {
    rc = mm_cam->evt->register_event_notify(
      mm_cam, evt_cb, user_data, evt_type);
  }
  return rc;
}

int32_t cam_evt_register_buf_notify(int cam_id,
  mm_camera_channel_type_t ch_type,
  mm_camera_buf_notify_t buf_cb,
  mm_camera_register_buf_cb_type_t cb_type,
  uint32_t cb_count,
  void * user_data)
{
  int32_t rc = -1;
  mm_camera_t * mm_cam = get_camera_by_id(cam_id);
  if (mm_cam) {
    rc = mm_cam->evt->register_buf_notify(
      mm_cam, ch_type, buf_cb, cb_type,
      cb_count, user_data);
  }
  return rc;
}

int32_t cam_evt_buf_done(int cam_id, mm_camera_ch_data_buf_t *bufs)
{
  int32_t rc = -1;
  mm_camera_t * mm_cam = get_camera_by_id(cam_id);
  if (mm_cam) {
    rc = mm_cam->evt->buf_done(mm_cam, bufs);
  }
  return rc;
}

/*camera JPEG methods*/
uint8_t cam_jpeg_is_jpeg_supported(int cam_id)
{
  uint8_t rc = 0;
  mm_camera_t * mm_cam = get_camera_by_id(cam_id);
  if (mm_cam) {
    rc = mm_cam->jpeg_ops->is_jpeg_supported(mm_cam);
  }
  return rc;
}

int32_t cam_jpeg_set_parm(int cam_id, mm_camera_jpeg_parm_type_t parm_type,
  void* p_value)
{
  int32_t rc = -1;
  mm_camera_t * mm_cam = get_camera_by_id(cam_id);
  if (mm_cam) {
    rc = mm_cam->jpeg_ops->set_parm(mm_cam, parm_type, p_value);
  }
  return rc;
}

int32_t cam_jpeg_get_parm(int cam_id, mm_camera_jpeg_parm_type_t parm_type,
  void* p_value)
{
  int32_t rc = -1;
  mm_camera_t * mm_cam = get_camera_by_id(cam_id);
  if (mm_cam) {
    rc = mm_cam->jpeg_ops->get_parm(mm_cam, parm_type, p_value);
  }
  return rc;
}
int32_t cam_jpeg_register_event_cb(int cam_id, mm_camera_jpeg_cb_t * evt_cb,
  void * user_data)
{
  int32_t rc = -1;
  mm_camera_t * mm_cam = get_camera_by_id(cam_id);
  if (mm_cam) {
    rc = mm_cam->jpeg_ops->register_event_cb(mm_cam, evt_cb, user_data);
  }
  return rc;
}
int32_t cam_jpeg_encode(int cam_id, uint8_t start,
  mm_camera_jpeg_encode_t *data)
{
  int32_t rc = -1;
  mm_camera_t * mm_cam = get_camera_by_id(cam_id);
  if (mm_cam) {
    rc = mm_cam->jpeg_ops->encode(mm_cam, start, data);
  }
  return rc;
}