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>
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@ -1966,8 +1966,16 @@ static int ftdi_process_packet(struct usb_serial_port *port,
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port->icount.dsr++;
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if (diff_status & FTDI_RS0_RI)
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port->icount.rng++;
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if (diff_status & FTDI_RS0_RLSD)
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if (diff_status & FTDI_RS0_RLSD) {
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struct tty_struct *tty;
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port->icount.dcd++;
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tty = tty_port_tty_get(&port->port);
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if (tty)
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usb_serial_handle_dcd_change(port, tty,
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status & FTDI_RS0_RLSD);
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tty_kref_put(tty);
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}
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wake_up_interruptible(&port->port.delta_msr_wait);
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priv->prev_status = status;
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