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Commit fff0a2ca authored by Nicolas Pitre's avatar Nicolas Pitre Committed by Greg Kroah-Hartman
Browse files

tty: move baudrate handling code to a file of its own 



To allow reuse without the rest of the tty_ioctl code.
No logical changes from this patch.

Signed-off-by: default avatarNicolas Pitre <nico@linaro.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 0c688614

drivers/tty/Makefile

+2 −1
Original line number Diff line number Diff line 
obj-$(CONFIG_TTY)		+= tty_io.o n_tty.o tty_ioctl.o tty_ldisc.o \

				   tty_buffer.o tty_port.o tty_mutex.o tty_ldsem.o

				   tty_buffer.o tty_port.o tty_mutex.o \

				   tty_ldsem.o tty_baudrate.o

obj-$(CONFIG_LEGACY_PTYS)	+= pty.o

obj-$(CONFIG_UNIX98_PTYS)	+= pty.o

obj-$(CONFIG_AUDIT)		+= tty_audit.o

drivers/tty/tty_baudrate.c

0 → 100644
+232 −0
Original line number Diff line number Diff line 
/*

 *  Copyright (C) 1991, 1992, 1993, 1994  Linus Torvalds

 */



#include <linux/types.h>

#include <linux/kernel.h>

#include <linux/termios.h>

#include <linux/tty.h>

#include <linux/export.h>





/*

 * Routine which returns the baud rate of the tty

 *

 * Note that the baud_table needs to be kept in sync with the

 * include/asm/termbits.h file.

 */

static const speed_t baud_table[] = {

	0, 50, 75, 110, 134, 150, 200, 300, 600, 1200, 1800, 2400, 4800,

	9600, 19200, 38400, 57600, 115200, 230400, 460800,

#ifdef __sparc__

	76800, 153600, 307200, 614400, 921600

#else

	500000, 576000, 921600, 1000000, 1152000, 1500000, 2000000,

	2500000, 3000000, 3500000, 4000000

#endif

};



#ifndef __sparc__

static const tcflag_t baud_bits[] = {

	B0, B50, B75, B110, B134, B150, B200, B300, B600,

	B1200, B1800, B2400, B4800, B9600, B19200, B38400,

	B57600, B115200, B230400, B460800, B500000, B576000,

	B921600, B1000000, B1152000, B1500000, B2000000, B2500000,

	B3000000, B3500000, B4000000

};

#else

static const tcflag_t baud_bits[] = {

	B0, B50, B75, B110, B134, B150, B200, B300, B600,

	B1200, B1800, B2400, B4800, B9600, B19200, B38400,

	B57600, B115200, B230400, B460800, B76800, B153600,

	B307200, B614400, B921600

};

#endif



static int n_baud_table = ARRAY_SIZE(baud_table);



/**

 *	tty_termios_baud_rate

 *	@termios: termios structure

 *

 *	Convert termios baud rate data into a speed. This should be called

 *	with the termios lock held if this termios is a terminal termios

 *	structure. May change the termios data. Device drivers can call this

 *	function but should use ->c_[io]speed directly as they are updated.

 *

 *	Locking: none

 */



speed_t tty_termios_baud_rate(struct ktermios *termios)

{

	unsigned int cbaud;



	cbaud = termios->c_cflag & CBAUD;



#ifdef BOTHER

	/* Magic token for arbitrary speed via c_ispeed/c_ospeed */

	if (cbaud == BOTHER)

		return termios->c_ospeed;

#endif

	if (cbaud & CBAUDEX) {

		cbaud &= ~CBAUDEX;



		if (cbaud < 1 || cbaud + 15 > n_baud_table)

			termios->c_cflag &= ~CBAUDEX;

		else

			cbaud += 15;

	}

	return baud_table[cbaud];

}

EXPORT_SYMBOL(tty_termios_baud_rate);



/**

 *	tty_termios_input_baud_rate

 *	@termios: termios structure

 *

 *	Convert termios baud rate data into a speed. This should be called

 *	with the termios lock held if this termios is a terminal termios

 *	structure. May change the termios data. Device drivers can call this

 *	function but should use ->c_[io]speed directly as they are updated.

 *

 *	Locking: none

 */



speed_t tty_termios_input_baud_rate(struct ktermios *termios)

{

#ifdef IBSHIFT

	unsigned int cbaud = (termios->c_cflag >> IBSHIFT) & CBAUD;



	if (cbaud == B0)

		return tty_termios_baud_rate(termios);



	/* Magic token for arbitrary speed via c_ispeed*/

	if (cbaud == BOTHER)

		return termios->c_ispeed;



	if (cbaud & CBAUDEX) {

		cbaud &= ~CBAUDEX;



		if (cbaud < 1 || cbaud + 15 > n_baud_table)

			termios->c_cflag &= ~(CBAUDEX << IBSHIFT);

		else

			cbaud += 15;

	}

	return baud_table[cbaud];

#else

	return tty_termios_baud_rate(termios);

#endif

}

EXPORT_SYMBOL(tty_termios_input_baud_rate);



/**

 *	tty_termios_encode_baud_rate

 *	@termios: ktermios structure holding user requested state

 *	@ispeed: input speed

 *	@ospeed: output speed

 *

 *	Encode the speeds set into the passed termios structure. This is

 *	used as a library helper for drivers so that they can report back

 *	the actual speed selected when it differs from the speed requested

 *

 *	For maximal back compatibility with legacy SYS5/POSIX *nix behaviour

 *	we need to carefully set the bits when the user does not get the

 *	desired speed. We allow small margins and preserve as much of possible

 *	of the input intent to keep compatibility.

 *

 *	Locking: Caller should hold termios lock. This is already held

 *	when calling this function from the driver termios handler.

 *

 *	The ifdefs deal with platforms whose owners have yet to update them

 *	and will all go away once this is done.

 */



void tty_termios_encode_baud_rate(struct ktermios *termios,

				  speed_t ibaud, speed_t obaud)

{

	int i = 0;

	int ifound = -1, ofound = -1;

	int iclose = ibaud/50, oclose = obaud/50;

	int ibinput = 0;



	if (obaud == 0)			/* CD dropped 		  */

		ibaud = 0;		/* Clear ibaud to be sure */



	termios->c_ispeed = ibaud;

	termios->c_ospeed = obaud;



#ifdef BOTHER

	/* If the user asked for a precise weird speed give a precise weird

	   answer. If they asked for a Bfoo speed they may have problems

	   digesting non-exact replies so fuzz a bit */



	if ((termios->c_cflag & CBAUD) == BOTHER)

		oclose = 0;

	if (((termios->c_cflag >> IBSHIFT) & CBAUD) == BOTHER)

		iclose = 0;

	if ((termios->c_cflag >> IBSHIFT) & CBAUD)

		ibinput = 1;	/* An input speed was specified */

#endif

	termios->c_cflag &= ~CBAUD;



	/*

	 *	Our goal is to find a close match to the standard baud rate

	 *	returned. Walk the baud rate table and if we get a very close

	 *	match then report back the speed as a POSIX Bxxxx value by

	 *	preference

	 */



	do {

		if (obaud - oclose <= baud_table[i] &&

		    obaud + oclose >= baud_table[i]) {

			termios->c_cflag |= baud_bits[i];

			ofound = i;

		}

		if (ibaud - iclose <= baud_table[i] &&

		    ibaud + iclose >= baud_table[i]) {

			/* For the case input == output don't set IBAUD bits

			   if the user didn't do so */

			if (ofound == i && !ibinput)

				ifound  = i;

#ifdef IBSHIFT

			else {

				ifound = i;

				termios->c_cflag |= (baud_bits[i] << IBSHIFT);

			}

#endif

		}

	} while (++i < n_baud_table);



	/*

	 *	If we found no match then use BOTHER if provided or warn

	 *	the user their platform maintainer needs to wake up if not.

	 */

#ifdef BOTHER

	if (ofound == -1)

		termios->c_cflag |= BOTHER;

	/* Set exact input bits only if the input and output differ or the

	   user already did */

	if (ifound == -1 && (ibaud != obaud || ibinput))

		termios->c_cflag |= (BOTHER << IBSHIFT);

#else

	if (ifound == -1 || ofound == -1)

		pr_warn_once("tty: Unable to return correct speed data as your architecture needs updating.\n");

#endif

}

EXPORT_SYMBOL_GPL(tty_termios_encode_baud_rate);



/**

 *	tty_encode_baud_rate		-	set baud rate of the tty

 *	@ibaud: input baud rate

 *	@obad: output baud rate

 *

 *	Update the current termios data for the tty with the new speed

 *	settings. The caller must hold the termios_rwsem for the tty in

 *	question.

 */



void tty_encode_baud_rate(struct tty_struct *tty, speed_t ibaud, speed_t obaud)

{

	tty_termios_encode_baud_rate(&tty->termios, ibaud, obaud);

}

EXPORT_SYMBOL_GPL(tty_encode_baud_rate);

drivers/tty/tty_ioctl.c

+0 −222
Original line number Diff line number Diff line
@@ -258,228 +258,6 @@ static void unset_locked_termios(struct tty_struct *tty, struct ktermios *old) 
	/* FIXME: What should we do for i/ospeed */

}



/*

 * Routine which returns the baud rate of the tty

 *

 * Note that the baud_table needs to be kept in sync with the

 * include/asm/termbits.h file.

 */

static const speed_t baud_table[] = {

	0, 50, 75, 110, 134, 150, 200, 300, 600, 1200, 1800, 2400, 4800,

	9600, 19200, 38400, 57600, 115200, 230400, 460800,

#ifdef __sparc__

	76800, 153600, 307200, 614400, 921600

#else

	500000, 576000, 921600, 1000000, 1152000, 1500000, 2000000,

	2500000, 3000000, 3500000, 4000000

#endif

};



#ifndef __sparc__

static const tcflag_t baud_bits[] = {

	B0, B50, B75, B110, B134, B150, B200, B300, B600,

	B1200, B1800, B2400, B4800, B9600, B19200, B38400,

	B57600, B115200, B230400, B460800, B500000, B576000,

	B921600, B1000000, B1152000, B1500000, B2000000, B2500000,

	B3000000, B3500000, B4000000

};

#else

static const tcflag_t baud_bits[] = {

	B0, B50, B75, B110, B134, B150, B200, B300, B600,

	B1200, B1800, B2400, B4800, B9600, B19200, B38400,

	B57600, B115200, B230400, B460800, B76800, B153600,

	B307200, B614400, B921600

};

#endif



static int n_baud_table = ARRAY_SIZE(baud_table);



/**

 *	tty_termios_baud_rate

 *	@termios: termios structure

 *

 *	Convert termios baud rate data into a speed. This should be called

 *	with the termios lock held if this termios is a terminal termios

 *	structure. May change the termios data. Device drivers can call this

 *	function but should use ->c_[io]speed directly as they are updated.

 *

 *	Locking: none

 */



speed_t tty_termios_baud_rate(struct ktermios *termios)

{

	unsigned int cbaud;



	cbaud = termios->c_cflag & CBAUD;



#ifdef BOTHER

	/* Magic token for arbitrary speed via c_ispeed/c_ospeed */

	if (cbaud == BOTHER)

		return termios->c_ospeed;

#endif

	if (cbaud & CBAUDEX) {

		cbaud &= ~CBAUDEX;



		if (cbaud < 1 || cbaud + 15 > n_baud_table)

			termios->c_cflag &= ~CBAUDEX;

		else

			cbaud += 15;

	}

	return baud_table[cbaud];

}

EXPORT_SYMBOL(tty_termios_baud_rate);



/**

 *	tty_termios_input_baud_rate

 *	@termios: termios structure

 *

 *	Convert termios baud rate data into a speed. This should be called

 *	with the termios lock held if this termios is a terminal termios

 *	structure. May change the termios data. Device drivers can call this

 *	function but should use ->c_[io]speed directly as they are updated.

 *

 *	Locking: none

 */



speed_t tty_termios_input_baud_rate(struct ktermios *termios)

{

#ifdef IBSHIFT

	unsigned int cbaud = (termios->c_cflag >> IBSHIFT) & CBAUD;



	if (cbaud == B0)

		return tty_termios_baud_rate(termios);



	/* Magic token for arbitrary speed via c_ispeed*/

	if (cbaud == BOTHER)

		return termios->c_ispeed;



	if (cbaud & CBAUDEX) {

		cbaud &= ~CBAUDEX;



		if (cbaud < 1 || cbaud + 15 > n_baud_table)

			termios->c_cflag &= ~(CBAUDEX << IBSHIFT);

		else

			cbaud += 15;

	}

	return baud_table[cbaud];

#else

	return tty_termios_baud_rate(termios);

#endif

}

EXPORT_SYMBOL(tty_termios_input_baud_rate);



/**

 *	tty_termios_encode_baud_rate

 *	@termios: ktermios structure holding user requested state

 *	@ispeed: input speed

 *	@ospeed: output speed

 *

 *	Encode the speeds set into the passed termios structure. This is

 *	used as a library helper for drivers so that they can report back

 *	the actual speed selected when it differs from the speed requested

 *

 *	For maximal back compatibility with legacy SYS5/POSIX *nix behaviour

 *	we need to carefully set the bits when the user does not get the

 *	desired speed. We allow small margins and preserve as much of possible

 *	of the input intent to keep compatibility.

 *

 *	Locking: Caller should hold termios lock. This is already held

 *	when calling this function from the driver termios handler.

 *

 *	The ifdefs deal with platforms whose owners have yet to update them

 *	and will all go away once this is done.

 */



void tty_termios_encode_baud_rate(struct ktermios *termios,

				  speed_t ibaud, speed_t obaud)

{

	int i = 0;

	int ifound = -1, ofound = -1;

	int iclose = ibaud/50, oclose = obaud/50;

	int ibinput = 0;



	if (obaud == 0)			/* CD dropped 		  */

		ibaud = 0;		/* Clear ibaud to be sure */



	termios->c_ispeed = ibaud;

	termios->c_ospeed = obaud;



#ifdef BOTHER

	/* If the user asked for a precise weird speed give a precise weird

	   answer. If they asked for a Bfoo speed they may have problems

	   digesting non-exact replies so fuzz a bit */



	if ((termios->c_cflag & CBAUD) == BOTHER)

		oclose = 0;

	if (((termios->c_cflag >> IBSHIFT) & CBAUD) == BOTHER)

		iclose = 0;

	if ((termios->c_cflag >> IBSHIFT) & CBAUD)

		ibinput = 1;	/* An input speed was specified */

#endif

	termios->c_cflag &= ~CBAUD;



	/*

	 *	Our goal is to find a close match to the standard baud rate

	 *	returned. Walk the baud rate table and if we get a very close

	 *	match then report back the speed as a POSIX Bxxxx value by

	 *	preference

	 */



	do {

		if (obaud - oclose <= baud_table[i] &&

		    obaud + oclose >= baud_table[i]) {

			termios->c_cflag |= baud_bits[i];

			ofound = i;

		}

		if (ibaud - iclose <= baud_table[i] &&

		    ibaud + iclose >= baud_table[i]) {

			/* For the case input == output don't set IBAUD bits

			   if the user didn't do so */

			if (ofound == i && !ibinput)

				ifound  = i;

#ifdef IBSHIFT

			else {

				ifound = i;

				termios->c_cflag |= (baud_bits[i] << IBSHIFT);

			}

#endif

		}

	} while (++i < n_baud_table);



	/*

	 *	If we found no match then use BOTHER if provided or warn

	 *	the user their platform maintainer needs to wake up if not.

	 */

#ifdef BOTHER

	if (ofound == -1)

		termios->c_cflag |= BOTHER;

	/* Set exact input bits only if the input and output differ or the

	   user already did */

	if (ifound == -1 && (ibaud != obaud || ibinput))

		termios->c_cflag |= (BOTHER << IBSHIFT);

#else

	if (ifound == -1 || ofound == -1)

		pr_warn_once("tty: Unable to return correct speed data as your architecture needs updating.\n");

#endif

}

EXPORT_SYMBOL_GPL(tty_termios_encode_baud_rate);



/**

 *	tty_encode_baud_rate		-	set baud rate of the tty

 *	@ibaud: input baud rate

 *	@obad: output baud rate

 *

 *	Update the current termios data for the tty with the new speed

 *	settings. The caller must hold the termios_rwsem for the tty in

 *	question.

 */



void tty_encode_baud_rate(struct tty_struct *tty, speed_t ibaud, speed_t obaud)

{

	tty_termios_encode_baud_rate(&tty->termios, ibaud, obaud);

}

EXPORT_SYMBOL_GPL(tty_encode_baud_rate);



/**

 *	tty_termios_copy_hw	-	copy hardware settings

 *	@new: New termios