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
--- a/drivers/usb/serial/ftdi_sio.c
+++ b/drivers/usb/serial/ftdi_sio.c
@@ -1966,8 +1966,16 @@
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;