CONTROL_DTR       356 drivers/usb/serial/cp210x.c #define CONTROL_DTR		0x0001
CONTROL_DTR        66 drivers/usb/serial/cypress_m8.h #define CONTROL_DTR	0x20	/* data terminal ready */
CONTROL_DTR       121 drivers/usb/serial/pl2303.c #define CONTROL_DTR			0x01