Commit b3e63afe authored by Rodolfo Giometti's avatar Rodolfo Giometti Committed by Linus Torvalds

ldisc: new dcd_change() method for line disciplines

Signed-off-by: default avatarRodolfo Giometti <>
Cc: David Woodhouse <>
Cc: Greg KH <>
Cc: Alan Cox <>
Cc: Alexander Gordeev <>
Signed-off-by: default avatarAndrew Morton <>
Signed-off-by: default avatarLinus Torvalds <>
parent 697fb85f
......@@ -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
......@@ -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;
Markdown is supported
0% or .
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment