MTK HDMI 流程

一、HDMI初始化

1. kernel-3.18/drivers/misc/mediatek/ext_disp/mtk_extd_mgr.c

 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 ;
 }

 2. kernel-3.18/drivers/misc/mediatek/ext_disp/extd_hdmi.c

 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 ;
 }

 3. kernel-3.18/drivers/misc/mediatek/ext_disp/mtk_extd_mgr.c

 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 ;
 }