USB: serial: call handle_dcd_change in ftdi driver.

When the device receive a DCD status change, forward the signal to the
USB serial system. This way, we can detect, for instance, PPS pulses.

Signed-off-by: Paul Chavent <paul.chavent@onera.fr>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/serial/ftdi_sio.c b/drivers/usb/serial/ftdi_sio.c
index c45f9c0..f53298d 100644 (file)
--- a/drivers/usb/serial/ftdi_sio.c
+++ b/drivers/usb/serial/ftdi_sio.c
@@ -1966,8 +1966,16 @@ static int ftdi_process_packet(struct usb_serial_port *port,
                        port->icount.dsr++;
                if (diff_status & FTDI_RS0_RI)
                        port->icount.rng++;
-               if (diff_status & FTDI_RS0_RLSD)
+               if (diff_status & FTDI_RS0_RLSD) {
+                       struct tty_struct *tty;
+
                        port->icount.dcd++;
+                       tty = tty_port_tty_get(&port->port);
+                       if (tty)
+                               usb_serial_handle_dcd_change(port, tty,
+                                               status & FTDI_RS0_RLSD);
+                       tty_kref_put(tty);
+               }
 
                wake_up_interruptible(&port->port.delta_msr_wait);
                priv->prev_status = status;