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struct usb_device { //´ú±íÒ»¸öUSBÉ豸
int devnum; //·ÖÅäµÄÉ豸µØÖ·£¬1-127
enum {
USB_SPEED_UNKNOWN = 0, /* enumerating */
USB_SPEED_LOW, USB_SPEED_FULL, /* usb 1.1 */
USB_SPEED_HIGH /* usb 2.0 */
} speed; //É豸ËÙ¶È£¬µÍËÙ/È«ËÙ/¸ßËÙ
struct usb_device *tt; /* usb1.1 device on usb2.0 bus */£¬ÊÂÎñ´¦Àí½âÊÍÆ÷
int ttport; /* device/hub port on that tt */É豸ËùÁ¬½ÓµÄ¾ßÓÐÊÂÎñ´¦Àí½âÊÍÆ÷¹¦Äܵļ¯Ï߯÷¶Ë¿Ú
atomic_t refcnt; /* Reference count */ÒýÓüÆÊý
struct semaphore serialize; //ÓÃÓÚͬ²½
unsigned int toggle[2]; /* one bit for each endpoint ([0] = IN, [1] = OUT) */ÓÃÓÚͬ²½Çл»µÄλͼ£¬Ã¿¸ö¶ËµãÕ¼ÓÃ1룬[0]±íʾÊäÈ룬[1]Êä³ö
unsigned int halted[2]; /* endpoint halts; one bit per endpoint # & direction; [0] = IN, [1] = OUT */±íʾ¶ËµãÊÇ·ñ´¦ÓÚֹͣ״̬µÄλͼ
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