Add handler to support TTY break_ctl operation
Signed-off-by: Jagannathan Raman <jag.raman@xxxxxxxxxx>
Reviewed-by: Liam Merwick <liam.merwick@xxxxxxxxxx>
Reviewed-by: Shannon Nelson <shannon.nelson@xxxxxxxxxx>
---
drivers/tty/vcc.c | 35 +++++++++++++++++++++++++++++++++++
1 files changed, 35 insertions(+), 0 deletions(-)
diff --git a/drivers/tty/vcc.c b/drivers/tty/vcc.c
index 070c541..f913217 100644
--- a/drivers/tty/vcc.c
+++ b/drivers/tty/vcc.c
@@ -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 int vcc_chars_in_buffer(struct tty_struct *tty)
.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)
--
1.7.1
--
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