UART_DSR           73 drivers/usb/serial/cypress_m8.h #define UART_DSR	0x20	/* data set ready */
UART_DSR          142 drivers/usb/serial/pl2303.c #define UART_DSR			0x02
UART_DSR          131 drivers/usb/serial/spcp8x5.c #define UART_DSR			0x02