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sparc64: vcc: Add break_ctl TTY operation

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Add handler to support TTY break_ctl operation

Signed-off-by: Jagannathan Raman <jag.raman@oracle.com>
Reviewed-by: Liam Merwick <liam.merwick@oracle.com>
Reviewed-by: Shannon Nelson <shannon.nelson@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jag Raman 2017-08-15 17:03:08 -04:00 committed by David S. Miller
parent aeee7debf3
commit e942e5775c
1 changed files with 35 additions and 0 deletions
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35
drivers/tty/vcc.c
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@ -960,6 +960,40 @@ static int vcc_chars_in_buffer(struct tty_struct *tty)
return num;
}
static int vcc_break_ctl(struct tty_struct *tty, int state)
{
struct vcc_port *port;
unsigned long flags;
if (unlikely(!tty)) {
pr_err("VCC: break_ctl: Invalid TTY handle\n");
return -ENXIO;
}
port = vcc_get_ne(tty->index);
if (unlikely(!port)) {
pr_err("VCC: break_ctl: Failed to find VCC port\n");
return -ENODEV;
}
/* Turn off break */
if (state == 0) {
vcc_put(port, false);
return 0;
}
spin_lock_irqsave(&port->lock, flags);
if (vcc_send_ctl(port, VCC_CTL_BREAK) < 0)
vcc_kick_tx(port);
spin_unlock_irqrestore(&port->lock, flags);
vcc_put(port, false);
return 0;
}
static const struct tty_operations vcc_ops = {
.open = vcc_open,
.close = vcc_close,
@ -967,6 +1001,7 @@ static const struct tty_operations vcc_ops = {
.write = vcc_write,
.write_room = vcc_write_room,
.chars_in_buffer = vcc_chars_in_buffer,
.break_ctl = vcc_break_ctl,
};
#define VCC_TTY_FLAGS (TTY_DRIVER_DYNAMIC_DEV | TTY_DRIVER_REAL_RAW)