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Commit c26c56c0 authored by Alan Cox's avatar Alan Cox Committed by Linus Torvalds
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tty: Cris has a nice RS485 ioctl so we should steal it 



JP Tosoni observed:

"About a RS485 ioctl: could you consider the attached files which are
 already in the Linux kernel (in include/asm-cris).  They define a
 TIOCSERSETRS485 (ioctl.h), and the data structure (rs485.h)
 with allows to specify timings. Sounds just like what we want ?"

and he's right: sort of. Rework the structure to use flag bits and make the
time delay a fixed sized field so we don't get 32/64bit problems. Add the ioctls
to x86 so that people know what to add to their platform of choice.

Signed-off-by: default avatarAlan Cox <alan@redhat.com>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 6f967f78

include/asm-x86/ioctls.h

+2 −0
Original line number Diff line number Diff line
@@ -51,6 +51,8 @@ 
#define TCSETS2		_IOW('T', 0x2B, struct termios2)

#define TCSETSW2	_IOW('T', 0x2C, struct termios2)

#define TCSETSF2	_IOW('T', 0x2D, struct termios2)

#define TIOCGRS485	0x542E

#define TIOCSRS485	0x542F

#define TIOCGPTN	_IOR('T', 0x30, unsigned int)

				/* Get Pty Number (of pty-mux device) */

#define TIOCSPTLCK	_IOW('T', 0x31, int)  /* Lock/unlock Pty */

include/linux/serial.h

+16 −0
Original line number Diff line number Diff line
@@ -173,6 +173,22 @@ struct serial_icounter_struct { 
	int reserved[9];

};



/*

 * Serial interface for controlling RS485 settings on chips with suitable

 * support. Set with TIOCSRS485 and get with TIOCGRS485 if supported by your

 * platform. The set function returns the new state, with any unsupported bits

 * reverted appropriately.

 */



struct serial_rs485 {

	__u32	flags;			/* RS485 feature flags */

#define SER_RS485_ENABLED		(1 << 0)

#define SER_RS485_RTS_ON_SEND		(1 << 1)

#define SER_RS485_RTS_AFTER_SEND	(1 << 2)

	__u32	delay_rts_before_send;	/* Milliseconds */

	__u32	padding[6];		/* Memory is cheap, new structs

					   are a royal PITA .. */

};



#ifdef __KERNEL__

#include <linux/compiler.h>