ACM_CTRL_DTR       20 drivers/staging/gdm724x/gdm_tty.c #define ACM_CTRL_DTR 0x01
ACM_CTRL_DTR       35 drivers/usb/class/cdc-acm.h #define ACM_CTRL_DTR		0x01
ACM_CTRL_DTR       61 drivers/usb/gadget/function/f_acm.c #define ACM_CTRL_DTR	(1 << 0)	/* host is ready for data r/w */