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 = 0;
    int ret = 0;
/*    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 - 1; 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
");
        return -1;
    }

    notifier.notifier_call = fb_notifier_callback;
    ret = fb_register_client(&notifier);
    if (ret)
        EXT_MGR_ERR("unable to register fb callback!
");

#ifdef CONFIG_HAS_EARLYSUSPEND
    register_early_suspend(&extd_early_suspend_handler);
#endif
    return 0;
}

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

int hdmi_init(void)
{
    int ret = 0;

    HDMI_ERR(" start
");
    /* for support hdmi hotplug, inform AP the event */
    hdmi_switch_data.name = "hdmi";
    hdmi_switch_data.index = 0;
    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!
", ret);

    hdmires_switch_data.name = "res_hdmi";
    hdmires_switch_data.index = 0;
    hdmires_switch_data.state = 0;
    ret = switch_dev_register(&hdmires_switch_data);

    if (ret)
        HDMI_ERR("[hdmi][HDMI]switch_dev_register failed, returned:%d!
", ret);
    HDMI_ERR(" done
");
    return 0;
}

 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 = 0;
    int i = 0;
    struct class_device *class_dev = NULL;

    EXT_MGR_FUNC();

    /* Allocate device number for hdmi driver */
    ret = alloc_chrdev_region(&extd_devno, 0, 1, EXTD_DEVNAME);

    if (ret) {
        EXT_MGR_LOG("alloc_chrdev_region fail
");
        return -1;
    }

    /* 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, 1);

    /* 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 - 1; i++) {
        if (extd_driver[i]->post_init != 0)
            extd_driver[i]->post_init();
    }

    EXT_MGR_LOG("[%s] out
", __func__);
    return 0;
}