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USB: serial: call handle_dcd_change in ftdi driver.

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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>
This commit is contained in:
Paul Chavent 2013-09-16 08:40:59 +02:00 committed by Greg Kroah-Hartman
parent db8f2aa358
commit d14654dff7
1 changed files with 9 additions and 1 deletions
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10
drivers/usb/serial/ftdi_sio.c
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@ -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;