一.UAC驱动初始化分析

代码路径：sound\usb\card.c

static struct usb_driver usb_audio_driver = {
    .name =        "snd-usb-audio",
    .probe =    usb_audio_probe, //匹配成功后进入这个函数，匹配过程前面的有说明
    .disconnect =    usb_audio_disconnect,
    .suspend =    usb_audio_suspend,
    .resume =    usb_audio_resume,
    .reset_resume =    usb_audio_reset_resume,
    .id_table =    usb_audio_ids,
    .supports_autosuspend = 1, 
};

module_usb_driver(usb_audio_driver); //这里封装了，用usb_register注册一个接口驱动

匹配过后，进入usb_audio_probe函数里面

static int usb_audio_probe(struct usb_interface *intf,
               const struct usb_device_id *usb_id)
{
    alts = &intf->al