MTK HDMI 流程

一、HDMI初始化

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

 1 static int __init mtk_extd_mgr_init(void)
 2 {
 3     int i = 0;
 4     int ret = 0;
 5 /*    struct notifier_block notifier;*/
 6 
 7     EXT_MGR_FUNC();
 8 
 9     extd_driver[DEV_MHL] = EXTD_HDMI_Driver();
10     extd_driver[DEV_EINK] = EXTD_EPD_Driver();
11     extd_factory_driver[DEV_MHL] = EXTD_Factory_HDMI_Driver();
12 
13     for (i = DEV_MHL; i < DEV_MAX_NUM - 1; i++) {
14         if (extd_driver[i]->init)
15             extd_driver[i]->init();
16     }
17 
18     if (platform_driver_register(&external_display_driver)) {//注册external_display_driver驱动程序
19         EXT_MGR_ERR("failed to register mtkfb driver
");
20         return -1;
21     }
22 
23     notifier.notifier_call = fb_notifier_callback;
24     ret = fb_register_client(&notifier);
25     if (ret)
26         EXT_MGR_ERR("unable to register fb callback!
");
27 
28 #ifdef CONFIG_HAS_EARLYSUSPEND
29     register_early_suspend(&extd_early_suspend_handler);
30 #endif
31     return 0;
32 }

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

 1 int hdmi_init(void)
 2 {
 3     int ret = 0;
 4 
 5     HDMI_ERR(" start
");
 6     /* for support hdmi hotplug, inform AP the event */
 7     hdmi_switch_data.name = "hdmi";
 8     hdmi_switch_data.index = 0;
 9     hdmi_switch_data.state = HDMI_STATE_NO_DEVICE;
10     ret = switch_dev_register(&hdmi_switch_data);
11 
12     if (ret)
13         HDMI_ERR("[hdmi][HDMI]switch_dev_register failed, returned:%d!
", ret);
14 
15     hdmires_switch_data.name = "res_hdmi";
16     hdmires_switch_data.index = 0;
17     hdmires_switch_data.state = 0;
18     ret = switch_dev_register(&hdmires_switch_data);
19 
20     if (ret)
21         HDMI_ERR("[hdmi][HDMI]switch_dev_register failed, returned:%d!
", ret);
22     HDMI_ERR(" done
");
23     return 0;
24 }

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

 1 static int mtk_extd_mgr_probe(struct platform_device *pdev)
 2 {
 3     int ret = 0;
 4     int i = 0;
 5     struct class_device *class_dev = NULL;
 6 
 7     EXT_MGR_FUNC();
 8 
 9     /* Allocate device number for hdmi driver */
10     ret = alloc_chrdev_region(&extd_devno, 0, 1, EXTD_DEVNAME);
11 
12     if (ret) {
13         EXT_MGR_LOG("alloc_chrdev_region fail
");
14         return -1;
15     }
16 
17     /* For character driver register to system, device number binded to file operations */
18     extd_cdev = cdev_alloc();
19     extd_cdev->owner = THIS_MODULE;
20     extd_cdev->ops = &external_display_fops;
21     ret = cdev_add(extd_cdev, extd_devno, 1);
22 
23     /* For device number binded to device name(hdmitx), one class is corresponeded to one node */
24     extd_class = class_create(THIS_MODULE, EXTD_DEVNAME);
25     /* mknod /dev/hdmitx */
26     class_dev = (struct class_device *)device_create(extd_class, NULL, extd_devno, NULL, EXTD_DEVNAME);
27     ext_dev_context = (struct device *)&(pdev->dev);
28 
29     for (i = DEV_MHL; i < DEV_MAX_NUM - 1; i++) {
30         if (extd_driver[i]->post_init != 0)
31             extd_driver[i]->post_init();
32     }
33 
34     EXT_MGR_LOG("[%s] out
", __func__);
35     return 0;
36 }

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原文地址：https://www.cnblogs.com/jiangjh/p/10374860.html