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authorAlan Cox <alan@redhat.com>2008-10-13 10:37:48 +0100
committerLinus Torvalds <torvalds@linux-foundation.org>2008-10-13 09:51:40 -0700
commitc26c56c0f40e200e61d1390629c806f6adaffbcc (patch)
tree88de4fce80e1529c7d34a59601752808351eb0ea /include/linux
parent6f967f7891076abc09e12ce952f85825e7ee8caf (diff)
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>
Diffstat (limited to 'include/linux')
-rw-r--r--include/linux/serial.h16
1 files changed, 16 insertions, 0 deletions
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>