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> 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