usb_davicom_trace
void usb_davicom_trace(bool force, const char *func, const char *fmt, ...);
#define TRACE(x...) usb_davicom_trace(false, __func__, x)
#define TRACE_ALWAYS(x...) usb_davicom_trace(true, __func__, x)
#define TRACE_STATE(x...) usb_davicom_trace(gTraceState, NULL, x)
#define TRACE_STATS(x...) usb_davicom_trace(gTraceStats, NULL, x)
#define TRACE_RX(x...) usb_davicom_trace(gTraceRX, NULL, x)
#define TRACE_TX(x...) usb_davicom_trace(gTraceTX, NULL, x)