From c26c56c0f40e200e61d1390629c806f6adaffbcc Mon Sep 17 00:00:00 2001 From: Alan Cox Date: Mon, 13 Oct 2008 10:37:48 +0100 Subject: 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: Alan Cox Signed-off-by: Linus Torvalds --- include/linux/serial.h | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) (limited to 'include/linux/serial.h') diff --git a/include/linux/serial.h b/include/linux/serial.h index deb714314fb..1ea8d9265bf 100644 --- a/include/linux/serial.h +++ b/include/linux/serial.h @@ -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 -- cgit v1.2.3