1 // SPDX-License-Identifier: GPL-2.0
14  * Routine which returns the baud rate of the tty
49  *	Convert termios baud rate data into a speed. This should be called
52  *	function but should use ->c_[io]speed directly as they are updated.
61 	cbaud = termios->c_cflag & CBAUD;  in tty_termios_baud_rate()
66 		return termios->c_ospeed;  in tty_termios_baud_rate()
72 			termios->c_cflag &= ~CBAUDEX;  in tty_termios_baud_rate()
84  *	Convert termios baud rate data into a speed. This should be called
87  *	function but should use ->c_[io]speed directly as they are updated.
95 	unsigned int cbaud = (termios->c_cflag >> IBSHIFT) & CBAUD;  in tty_termios_input_baud_rate()
102 		return termios->c_ispeed;  in tty_termios_input_baud_rate()
108 			termios->c_cflag &= ~(CBAUDEX << IBSHIFT);  in tty_termios_input_baud_rate()
145 	int ifound = -1, ofound = -1;  in tty_termios_encode_baud_rate()
152 	termios->c_ispeed = ibaud;  in tty_termios_encode_baud_rate()
153 	termios->c_ospeed = obaud;  in tty_termios_encode_baud_rate()
156 	if ((termios->c_cflag >> IBSHIFT) & CBAUD)  in tty_termios_encode_baud_rate()
162 	   digesting non-exact replies so fuzz a bit */  in tty_termios_encode_baud_rate()
164 	if ((termios->c_cflag & CBAUD) == BOTHER) {  in tty_termios_encode_baud_rate()
169 	if (((termios->c_cflag >> IBSHIFT) & CBAUD) == BOTHER)  in tty_termios_encode_baud_rate()
172 	termios->c_cflag &= ~CBAUD;  in tty_termios_encode_baud_rate()
174 	termios->c_cflag &= ~(CBAUD << IBSHIFT);  in tty_termios_encode_baud_rate()
178 	 *	Our goal is to find a close match to the standard baud rate  in tty_termios_encode_baud_rate()
179 	 *	returned. Walk the baud rate table and if we get a very close  in tty_termios_encode_baud_rate()
185 		if (obaud - oclose <= baud_table[i] &&  in tty_termios_encode_baud_rate()
187 			termios->c_cflag |= baud_bits[i];  in tty_termios_encode_baud_rate()
190 		if (ibaud - iclose <= baud_table[i] &&  in tty_termios_encode_baud_rate()
199 				termios->c_cflag |= (baud_bits[i] << IBSHIFT);  in tty_termios_encode_baud_rate()
210 	if (ofound == -1)  in tty_termios_encode_baud_rate()
211 		termios->c_cflag |= BOTHER;  in tty_termios_encode_baud_rate()
214 	if (ifound == -1 && (ibaud != obaud || ibinput))  in tty_termios_encode_baud_rate()
215 		termios->c_cflag |= (BOTHER << IBSHIFT);  in tty_termios_encode_baud_rate()
217 	if (ifound == -1 || ofound == -1)  in tty_termios_encode_baud_rate()
224  *	tty_encode_baud_rate		-	set baud rate of the tty
225  *	@ibaud: input baud rate
226  *	@obaud: output baud rate
235 	tty_termios_encode_baud_rate(&tty->termios, ibaud, obaud);  in tty_encode_baud_rate()