uart_get_baud_rate (9)

unsigned int uart_get_baud_rate(struct uart_port * port, struct ktermios * termios, struct ktermios * old, unsigned int min, unsigned int max);

port

uart_port structure describing the port in question.

termios

desired termios settings.

old

old termios (or NULL)

min

minimum acceptable baud rate

max

maximum acceptable baud rate

Decode the termios structure into a numeric baud rate, taking account of the magic 38400 baud rate (with spd_* flags), and mapping the B0 rate to 9600 baud.

If the new baud rate is invalid, try the old termios setting. If it's still invalid, we try 9600 baud.

Update the termios structure to reflect the baud rate we're actually going to be using. Don't do this for the case where B0 is requested (“hang up”).