static int __init mtk_extd_mgr_init(void)

 {

     int i = ;

     int ret = ;

 /*    struct notifier_block notifier;*/

     EXT_MGR_FUNC();

     extd_driver[DEV_MHL] = EXTD_HDMI_Driver();

     extd_driver[DEV_EINK] = EXTD_EPD_Driver();

     extd_factory_driver[DEV_MHL] = EXTD_Factory_HDMI_Driver();

     for (i = DEV_MHL; i < DEV_MAX_NUM - ; i++) {

         if (extd_driver[i]->init)

             extd_driver[i]->init();

     }

     if (platform_driver_register(&external_display_driver)) {//注册external_display_driver驱动程序

         EXT_MGR_ERR("failed to register mtkfb driver\n");

         return -;

     }

     notifier.notifier_call = fb_notifier_callback;

     ret = fb_register_client(&notifier);

     if (ret)

         EXT_MGR_ERR("unable to register fb callback!\n");

 #ifdef CONFIG_HAS_EARLYSUSPEND

     register_early_suspend(&extd_early_suspend_handler);

 #endif

     return ;

 }

 int hdmi_init(void)

 {

     int ret = ;

     HDMI_ERR(" start\n");

     /* for support hdmi hotplug, inform AP the event */

     hdmi_switch_data.name = "hdmi";

     hdmi_switch_data.index = ;

     hdmi_switch_data.state = HDMI_STATE_NO_DEVICE;

     ret = switch_dev_register(&hdmi_switch_data);

     if (ret)

         HDMI_ERR("[hdmi][HDMI]switch_dev_register failed, returned:%d!\n", ret);

     hdmires_switch_data.name = "res_hdmi";

     hdmires_switch_data.index = ;

     hdmires_switch_data.state = ;

     ret = switch_dev_register(&hdmires_switch_data);

     if (ret)

         HDMI_ERR("[hdmi][HDMI]switch_dev_register failed, returned:%d!\n", ret);

     HDMI_ERR(" done\n");

     return ;

 }

 static int mtk_extd_mgr_probe(struct platform_device *pdev)

 {

     int ret = ;

     int i = ;

     struct class_device *class_dev = NULL;

     EXT_MGR_FUNC();

     /* Allocate device number for hdmi driver */

     ret = alloc_chrdev_region(&extd_devno, , , EXTD_DEVNAME);

     if (ret) {

         EXT_MGR_LOG("alloc_chrdev_region fail\n");

         return -;

     }

     /* For character driver register to system, device number binded to file operations */

     extd_cdev = cdev_alloc();

     extd_cdev->owner = THIS_MODULE;

     extd_cdev->ops = &external_display_fops;

     ret = cdev_add(extd_cdev, extd_devno, );

     /* For device number binded to device name(hdmitx), one class is corresponeded to one node */

     extd_class = class_create(THIS_MODULE, EXTD_DEVNAME);

     /* mknod /dev/hdmitx */

     class_dev = (struct class_device *)device_create(extd_class, NULL, extd_devno, NULL, EXTD_DEVNAME);

     ext_dev_context = (struct device *)&(pdev->dev);

     for (i = DEV_MHL; i < DEV_MAX_NUM - ; i++) {

         if (extd_driver[i]->post_init != )

             extd_driver[i]->post_init();

     }

     EXT_MGR_LOG("[%s] out\n", __func__);

     return ;

 }