serial_core: Add wake_peer uart operation which is called before starting UART TX. The idea here is to provide a mechanism where we can wakeup our peer before sending data.
Signed-off-by: San Mehat <san@google.com>
diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c
index db7912c..62ba22f 100644
--- a/drivers/tty/serial/serial_core.c
+++ b/drivers/tty/serial/serial_core.c
@@ -91,6 +91,9 @@
struct uart_state *state = tty->driver_data;
struct uart_port *port = state->uart_port;
+ if (port->ops->wake_peer)
+ port->ops->wake_peer(port);
+
if (!uart_circ_empty(&state->xmit) && state->xmit.buf &&
!tty->stopped && !tty->hw_stopped)
port->ops->start_tx(port);
diff --git a/include/linux/serial_core.h b/include/linux/serial_core.h
index a5c3114..0d23989 100644
--- a/include/linux/serial_core.h
+++ b/include/linux/serial_core.h
@@ -245,6 +245,7 @@
void (*pm)(struct uart_port *, unsigned int state,
unsigned int oldstate);
int (*set_wake)(struct uart_port *, unsigned int state);
+ void (*wake_peer)(struct uart_port *);
/*
* Return a string describing the type of the port