diff options
| author |   Alan Cox <alan@redhat.com> | 2008-10-13 10:37:48 +0100 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@linux-foundation.org> | 2008-10-13 09:51:40 -0700 |
| commit | c26c56c0f40e200e61d1390629c806f6adaffbcc (patch) | |
| tree | 88de4fce80e1529c7d34a59601752808351eb0ea | |
| parent | tty: use krefs to protect driver module counts (diff) | |
| download | linux-dev-c26c56c0f40e200e61d1390629c806f6adaffbcc.tar.xz linux-dev-c26c56c0f40e200e61d1390629c806f6adaffbcc.zip | |
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 <alan@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | include/asm-x86/ioctls.h | 2 | ||||
| -rw-r--r-- | include/linux/serial.h | 16 |
2 files changed, 18 insertions, 0 deletions
diff --git a/include/asm-x86/ioctls.h b/include/asm-x86/ioctls.h index 336603512399..1a8ac45b28be 100644 --- a/include/asm-x86/ioctls.h +++ b/include/asm-x86/ioctls.h @@ -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 */ diff --git a/include/linux/serial.h b/include/linux/serial.h index deb714314fb1..1ea8d9265bf6 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 <linux/compiler.h> |