rtsx_usb_read_ppbuf
EXPORT_SYMBOL_GPL(rtsx_usb_read_ppbuf);
err = rtsx_usb_read_ppbuf(ucr, buf, byte_cnt - (byte_cnt % 2));
extern int rtsx_usb_read_ppbuf(struct rtsx_ucr *ucr, u8 *buf, int buf_len);