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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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5
drivers/char/esp.c
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@ -1725,13 +1725,13 @@ static int esp_tiocmset(struct tty_struct *tty, struct file *file,
/*
* rs_break() --- routine which turns the break handling on or off
*/
static void esp_break(struct tty_struct *tty, int break_state)
static int esp_break(struct tty_struct *tty, int break_state)
{
struct esp_struct *info = tty->driver_data;
unsigned long flags;
if (serial_paranoia_check(info, tty->name, "esp_break"))
return;
return -EINVAL;
if (break_state == -1) {
spin_lock_irqsave(&info->lock, flags);
@ -1747,6 +1747,7 @@ static void esp_break(struct tty_struct *tty, int break_state)
serial_out(info, UART_ESI_CMD2, 0x00);
spin_unlock_irqrestore(&info->lock, flags);
}
return 0;
}
static int rs_ioctl(struct tty_struct *tty, struct file *file,