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authorRodolfo Giometti <giometti@linux.it>2010-03-10 15:23:45 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2010-03-12 15:52:43 -0800
commitb3e63afe8a74c0134d05a551cc74facc3b3ec0d7 (patch)
tree7b20af342a2c9ff31bd202e81075fab22cc2a282
parent697fb85fcf21b5229a3072440222d14b05ef2abe (diff)
downloadop-kernel-dev-b3e63afe8a74c0134d05a551cc74facc3b3ec0d7.zip
op-kernel-dev-b3e63afe8a74c0134d05a551cc74facc3b3ec0d7.tar.gz
ldisc: new dcd_change() method for line disciplines
Signed-off-by: Rodolfo Giometti <giometti@linux.it> Cc: David Woodhouse <dwmw2@infradead.org> Cc: Greg KH <greg@kroah.com> Cc: Alan Cox <alan@lxorguk.ukuu.org.uk> Cc: Alexander Gordeev <lasaine@lvk.cs.msu.su> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--Documentation/serial/tty.txt4
-rw-r--r--include/linux/tty_ldisc.h8
2 files changed, 12 insertions, 0 deletions
diff --git a/Documentation/serial/tty.txt b/Documentation/serial/tty.txt
index 5e5349a..7c90050 100644
--- a/Documentation/serial/tty.txt
+++ b/Documentation/serial/tty.txt
@@ -105,6 +105,10 @@ write_wakeup() - May be called at any point between open and close.
is permitted to call the driver write method from
this function. In such a situation defer it.
+dcd_change() - Report to the tty line the current DCD pin status
+ changes and the relative timestamp. The timestamp
+ can be NULL.
+
Driver Access
diff --git a/include/linux/tty_ldisc.h b/include/linux/tty_ldisc.h
index 0c4ee9b..526d66f 100644
--- a/include/linux/tty_ldisc.h
+++ b/include/linux/tty_ldisc.h
@@ -99,6 +99,12 @@
* cease I/O to the tty driver. Can sleep. The driver should
* seek to perform this action quickly but should wait until
* any pending driver I/O is completed.
+ *
+ * void (*dcd_change)(struct tty_struct *tty, unsigned int status,
+ * struct timespec *ts)
+ *
+ * Tells the discipline that the DCD pin has changed its status and
+ * the relative timestamp. Pointer ts can be NULL.
*/
#include <linux/fs.h>
@@ -136,6 +142,8 @@ struct tty_ldisc_ops {
void (*receive_buf)(struct tty_struct *, const unsigned char *cp,
char *fp, int count);
void (*write_wakeup)(struct tty_struct *);
+ void (*dcd_change)(struct tty_struct *, unsigned int,
+ struct timespec *);
struct module *owner;
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