ACM_CTRL_DCD       24 drivers/staging/gdm724x/gdm_tty.c #define ACM_CTRL_DCD 0x01
ACM_CTRL_DCD       42 drivers/usb/class/cdc-acm.h #define ACM_CTRL_DCD		0x01
ACM_CTRL_DCD       71 drivers/usb/gadget/function/f_acm.c #define ACM_CTRL_DCD		(1 << 0)