uart_get_baud_rate — return baud rate for a particular port
unsigned int uart_get_baud_rate ( | struct uart_port * | port, |
| struct ktermios * | termios, | |
| struct ktermios * | old, | |
| unsigned int | min, | |
| unsigned int | max); |
portuart_port structure describing the port in question.
termiosdesired termios settings.
oldold termios (or NULL)
minminimum acceptable baud rate
maxmaximum 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”).