_cxusb_power_ctrl
ret = _cxusb_power_ctrl(dvbdev, 1);
ret = _cxusb_power_ctrl(dvbdev, 1);
_cxusb_power_ctrl(dvbdev, 1);
_cxusb_power_ctrl(dvbdev, 0);
ret = _cxusb_power_ctrl(d, onoff);