Camera subdev註冊流程

lethe1203發表於2024-03-29
dev
參考資料：
極客筆記https://deepinout.com/camera-sensor-driver/camera-sensor-driver-sensor-subdev-register-flow.html

Camera驅動模型：

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使用者空間透過CSL協議層，才能訪問到Camera subdev，/dev/v4l-subdevx都不是固定的
可以透過cat /sys/class/video4linux/v4l-subdevx/name查詢到當前裝置各個子裝置都具體是啥裝置
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cam_sensor_dev：註冊裝置，暴露介面
cam_sensor_soc：解析dts，比如clk，regulator等
cam_sensor_core：實際工作流程，開啟關閉開流等
 static const struct camera_submodule_component camera_sensor[] = {
 #ifdef CONFIG_SPECTRA_SENSOR
         {&cam_res_mgr_init, &cam_res_mgr_exit},    // 入口函式所有子裝置都在這裡
         {&cam_cci_init_module, &cam_cci_exit_module},
         {&cam_csiphy_init_module, &cam_csiphy_exit_module},
         {&cam_tpg_init_module, &cam_tpg_exit_module},
         {&cam_actuator_driver_init, &cam_actuator_driver_exit},
         {&cam_sensor_driver_init, &cam_sensor_driver_exit},
         {&cam_eeprom_driver_init, &cam_eeprom_driver_exit},
         {&cam_ois_driver_init, &cam_ois_driver_exit},
         {&cam_flash_init_module, &cam_flash_exit_module},
 #endif
 };

platform_driver_register註冊平臺裝置，針對高通的cci匯流排的
i2c_add_driver註冊i2c裝置
高通支援掛載到i2c匯流排，也支援掛載到cci匯流排
CRM就是video裝置，引入component框架
struct cam_sensor_ctrl_t整個sensor資源都是存在這個結構體裡面
 static int cam_sensor_init_subdev_params(struct cam_sensor_ctrl_t *s_ctrl)
 {
         int rc = 0;

         s_ctrl->v4l2_dev_str.internal_ops = &cam_sensor_internal_ops;
         s_ctrl->v4l2_dev_str.ops = &cam_sensor_subdev_ops;                // subdev操作控制介面
         strscpy(s_ctrl->device_name, CAMX_SENSOR_DEV_NAME, CAM_CTX_DEV_NAME_MAX_LENGTH);
         s_ctrl->v4l2_dev_str.name = s_ctrl->device_name;
         s_ctrl->v4l2_dev_str.sd_flags = (V4L2_SUBDEV_FL_HAS_DEVNODE | V4L2_SUBDEV_FL_HAS_EVENTS);    // 前面確定是否暴露裝置節點給上層，後者表示有沒event通知機制
         s_ctrl->v4l2_dev_str.ent_function = CAM_SENSOR_DEVICE_TYPE;        // 查詢這個type型別，CSL匹配這個型別確定開啟的是哪一個的
         s_ctrl->v4l2_dev_str.token = s_ctrl;
         s_ctrl->v4l2_dev_str.close_seq_prior = CAM_SD_CLOSE_MEDIUM_LOW_PRIORITY;

         rc = cam_register_subdev(&(s_ctrl->v4l2_dev_str));    // 註冊子裝置
         if (rc)
                 CAM_ERR(CAM_SENSOR, "Fail with cam_register_subdev rc: %d", rc);

         return rc;
 }
回撥介面：
 s_ctrl->bridge_intf.device_hdl = -1;
 s_ctrl->bridge_intf.link_hdl = -1;
 s_ctrl->bridge_intf.ops.get_dev_info = cam_sensor_publish_dev_info;    // CRM bridge介面
 s_ctrl->bridge_intf.ops.link_setup = cam_sensor_establish_link;
 s_ctrl->bridge_intf.ops.apply_req = cam_sensor_apply_request;
 s_ctrl->bridge_intf.ops.notify_frame_skip =
         cam_sensor_notify_frame_skip;
 s_ctrl->bridge_intf.ops.flush_req = cam_sensor_flush_request;    // flush
 s_ctrl->bridge_intf.ops.process_evt = cam_sensor_process_evt;    // 訊息處理事件介面
流程如下：
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