qualcomm camera 学习笔记

高通camera学习笔记概述（一二三四五） http://www.cnblogs.com/potato-coffee/p/4172009.html
android camera 预览 app到hal  http://blog.csdn.net/tankai19880619/article/details/22795217
电路图，时序图，移植，介绍参数 移植时用  http://www.cnblogs.com/thjfk/p/4086001.html
简单的移植   http://blog.csdn.net/u013531497/article/details/18737111
从上到下，特别全 代码注释很全   http://www.cnblogs.com/joseph-linux/p/3515151.html

音圈马达VCM（Voice Coil Motor）、陶瓷马达（Piezo Motor）、步进马达（Stepper Motor）。
高通自带camera app 相关功能开关
exif相关 getExifData
    hardware/qcom/camera/QCamera2/stack/mm-jpeg-interface/src$ vi mm_jpeg_exif.cpackages/apps/Camera2$ vi AndroidManifest.xml

fh  file handle
vb video buff
sd sub dev
digital video port (DVP)
AEC，即Automatic Exposure Control
ds_fd:   domain socket file descriptor
manual exposure
OIS，它的全称是Optical Image Stabilization，从字面理解就是稳定的光学图象
OIS是松下公司数码相机中光学防抖的标志，佳能称为IS，尼康称为VR，适马称为OS，腾龙称为VC
MSM：Mobile Station Modem 的简写，包含基带的智能机处理器。
APQ：Application Processor Qualcomm 的简写，不集成基带的处理器。
LSC Lens Shading Correction
msm_sensor_init_subdev_ioctl
msm_sensor_driver_cmd
msm_sensor_driver_probe
rc = s_ctrl->func_tbl->sensor_power_up(s_ctrl);


server.c
main()
module_sensor_init
  module_sensor_find_sensor_subdev
        cfg.cfgtype = CFG_GET_SENSOR_INFO;
        rc = ioctl(sd_fd, VIDIOC_MSM_SENSOR_CFG, &cfg);

    msm_sensor_config(CFG_GET_SENSOR_INFO)


  module_sensor_find_other_subdev
    rc = ioctl(sd_fd, VIDIOC_MSM_SENSOR_GET_SUBDEV_ID, &subdev_id);
    msm_csiphy_subdev_ioctl(VIDIOC_MSM_SENSOR_GET_SUBDEV_ID)

        rc = ioctl(sd_fd, VIDIOC_MSM_SENSOR_GET_SUBDEV_ID, &subdev_id);
    msm_csid_subdev_ioctl(VIDIOC_MSM_SENSOR_GET_SUBDEV_ID)

    rc = ioctl(sd_fd, VIDIOC_MSM_SENSOR_GET_SUBDEV_ID, &subdev_id);
    msm_led_flash_subdev_ioctl()

    msm_csid_subdev_ioctl(VIDIOC_MSM_CSID_IO_CFG)
    msm_csid_cmd(CSID_INIT)
    msm_csid_cmd(CSID_RELEASE)



msm.c
probe 创建dev/videoX

drivers/media/platform/msm/camera_v2/sensor/msm_sensor_driver.c
    /*
     * Create /dev/videoX node, comment for now until dummy /dev/videoX
     * node is created and used by HAL
     */

    if (s_ctrl->sensor_device_type == MSM_CAMERA_PLATFORM_DEVICE)
        rc = msm_sensor_driver_create_v4l_subdev(s_ctrl);
    else
        rc = msm_sensor_driver_create_i2c_v4l_subdev(s_ctrl);
    if (rc < 0) {
        pr_err("failed: camera creat v4l2 rc %d", rc);
        goto camera_power_down;
    }

    msm_sd_register
    __msm_sd_register_subdev
    __video_register_device

mm-camera/apps/v4l2-qcamera-app/v4l2-qcamera-app.c
main
  snprintf(camera_dev_node, BUFF_SIZE_64, "/dev/video%d", camera_id);
  eventfd = open(camera_dev_node,O_RDWR | O_NONBLOCK);
  camera_v4l2_open
    msm_create_session
  camera_pack_event(filep, MSM_CAMERA_NEW_SESSION, 0, -1, &event);
  rc = msm_post_event(&event, MSM_POST_EVT_TIMEOUT);

server.c
main
  if (event.id == MSM_CAMERA_NEW_SESSION) {
   proc_ret = server_process_hal_event(&event);
     server_process_hal_event

   switch (proc_ret.result) {
   case RESULT_NEW_SESSION: {

   case SERV_RET_TO_HAL_CMDACK:
   ioctl(hal_fd->fd[0], MSM_CAM_V4L2_IOCTL_CMD_ACK,

   msm_private_ioctl
    case MSM_CAM_V4L2_IOCTL_CMD_ACK: {

rc = camera_check_event_status(&event);
回到eventfd = open(camera_dev_node,O_RDWR | O_NONBLOCK);


0413:
1.理解dtsi，sensor和sensorlib中参数的意义
    dtsi 参考Documentation/devicetree/bindings/media/video/msm-cci.txt
    ov7695.c 结构体 struct msm_sensor_ctrl_t
        ov7695_lib.c  结构体 sensor_lib_t
    
2.找到上电初始化code，学会修改
上电2条线：
   1. camera drvier
     ov7695.c  ov7695_platform_probe--->msm_sensor_platform_probe-->rc = s_ctrl->func_tbl->sensor_power_up(s_ctrl);
           msm_ov7695_i2c_probe-->msm_sensor_i2c_probe-->rc = s_ctrl->func_tbl->sensor_power_up(s_ctrl);
   2.ioctl
    msm_sensor_init_subdev_ioctl->msm_sensor_driver_cmd-->msm_sensor_driver_probe-->rc = s_ctrl->func_tbl->sensor_power_up(s_ctrl);
    
    hardware:mm_camera_interface.c
      get_num_of_cameras()
        if (ioctl(sd_fd, VIDIOC_MSM_SENSOR_INIT_CFG, &cfg) < 0)
    
    vendor sensor.c main()
      server_process_module_init-->module_sensor_init-->sensor_init_probe->sensor_probe-->CFG_SINIT_PROBE if (LOG_IOCTL(fd, VIDIOC_MSM_SENSOR_INIT_CFG, &cfg) < 0) {
    
msm_sensor_ctrl_t中包含msm_sensor_power_setting(power_setting)的地方：
 
    struct msm_sensor_power_setting {
        enum msm_sensor_power_seq_type_t seq_type;
        uint16_t seq_val;
        long config_val;
        uint16_t delay;
        void *data[10];
    };

     3.msm_sensor_config


    msm_camera_sensor_board_info(sensordata)-->msm_camera_power_ctrl_t(power_info)-->msm_sensor_power_setting(power_setting)
                                -->msm_camera_sensor_slave_info(cam_slave_info)-->msm_sensor_power_setting_array(power_setting_array)-->msm_sensor_power_setting (power_setting)
    msm_sensor_power_setting_array(power_setting_array)-->msm_sensor_power_setting(power_setting)
上电时序就是：
qcom,cam-power-seq-type

open 流程：-=========================================
http://blog.csdn.net/discovery_by_joseph/article/details/40434127?utm_source=tuicool&utm_medium=referral


=============================framework==================================
Camera.java  public static Camera open(int cameraId)  --> Camera -->  cameraInitNormal -->  cameraInitVersion  -->native_setup

通过android_hardware_Camera.cpp  JNINativeMethod camMethods  --> android_hardware_Camera_native_setup  -->Camera::connect
怎么映射过来的？
Camera.cpp  sp Camera::connect

CameraManager.java   openCamera  -->  openCameraDeviceUserAsync
connectDevice
CameraService.cpp    connectFinishUnsafe
CameraHardwareInterface.h  initialize  rc = CameraService::filterOpenErrorCode(module->methods->open()
========================hardware=================================log

QCamera2HWI.cpp QCamera2HardwareInterface::openCamera(struct hw_device_t **hw_device)
=========================kernel=========================open()
    v4l2_open
      vdev->fops->open(filp);
    camera_v4l2_open
        camera_pack_event(filep, MSM_CAMERA_NEW_SESSION, 0, -1, &event);
        rc = msm_post_event(&event, MSM_POST_EVT_TIMEOUT);
=========================server=========================main()
    server_process_hal_event(MSM_CAMERA_NEW_SESSION)
=========================MCT=========================
    mct_controller_new
        mct_pipeline_start_session    
        mct_pipeline_modules_start
            mct_pipeline_start_session_thread
              if (module->start_session) {
                  rc = module->start_session(module, session_id);

=========================vendor driver=========================
    module_sensor_start_session
        module_sensor_init_session
          rc = module_sensor_params->func_tbl.process(module_sensor_params->sub_module_private,SENSOR_INIT, NULL);
            sensor_process(SENSOR_INIT)
                rc = sensor_init(sctrl);
                sensor_power_up
                    cfg.cfgtype = CFG_POWER_UP;
                     if (LOG_IOCTL(ctrl->s_data->fd, VIDIOC_MSM_SENSOR_CFG, &cfg) < 0) {


=========================kernel=========================open()
    msm_sensor_subdev_ioctl(VIDIOC_MSM_SENSOR_CFG,CFG_POWER_UP)
        ov7695_sensor_config
        msm_sensor_power_up


end

system/lib/hw/camera.msm8974.so

0414:
熟悉几种工作模式：
1.预览
2.自动对焦
3.拍照
video_register_device 创建dev/videoX
0415:
数据流：从camera获取数据上传
打开camera   QCamera2HWI.cpp QCamera2HardwareInterface::openCamera(struct hw_device_t **hw_device)
0418:
参照下面的文章学习camera打开流程
http://wenku.baidu.com/link?url=1kju8IrcWahLI92LhNDwKRtJvPWJ8v9WW2GWbbrwmqII_YCR0hpb9m4fwu3ZUsH6rhPK_CqSxjoAHnChfiTr_hj1oLMfu9Ot5vqVwqeF1MC
preview http://blog.csdn.net/dnfchan/article/details/7602213
19：45