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tty: rework break handling

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Some hardware needs to do break handling itself and may have partial
support only. Make break_ctl return an error code. Add a tty driver flag
so you can indicate driver hardware side break support.

Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Alan Cox
2008-07-22 11:18:03 +01:00
committed by Linus Torvalds
parent abbe629ae4
commit 9e98966c7b
20 changed files with 97 additions and 84 deletions
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9
drivers/usb/class/cdc-acm.c
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@@ -732,13 +732,16 @@ static void acm_tty_unthrottle(struct tty_struct *tty)
tasklet_schedule(&acm->urb_task);
}
static void acm_tty_break_ctl(struct tty_struct *tty, int state)
static int acm_tty_break_ctl(struct tty_struct *tty, int state)
{
struct acm *acm = tty->driver_data;
int retval;
if (!ACM_READY(acm))
return;
if (acm_send_break(acm, state ? 0xffff : 0))
return -EINVAL;
retval = acm_send_break(acm, state ? 0xffff : 0);
if (retval < 0)
dbg("send break failed");
return retval;
}
static int acm_tty_tiocmget(struct tty_struct *tty, struct file *file)