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| author | Paul Chavent <Paul.Chavent@onera.fr> | 2013-09-16 08:41:00 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-09-26 18:45:40 +0200 |
| commit | 833efc0ed19ce9ed7a84dfd3684eb9d892fe9ded (patch) | |
| tree | 1a693b88ee1c976704262a09b788ef0c4e62f87c /drivers/usb/serial | |
| parent | USB: serial: call handle_dcd_change in ftdi driver. (diff) | |
| download | linux-833efc0ed19ce9ed7a84dfd3684eb9d892fe9ded.tar.xz linux-833efc0ed19ce9ed7a84dfd3684eb9d892fe9ded.zip | |
USB: serial: invoke dcd_change ldisc's handler.
The DCD pin of the serial port can receive a PPS signal. By calling
the port line discipline dcd handle, this patch allow to monitor PPS
through USB serial devices.
However the performance aren't as good as the uart drivers, so
document this point too.
Signed-off-by: Paul Chavent <paul.chavent@onera.fr>
Acked-by: Rodolfo Giometti <giometti@enneenne.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb/serial')
| -rw-r--r-- | drivers/usb/serial/generic.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/drivers/usb/serial/generic.c b/drivers/usb/serial/generic.c index 1f31e6b4c251..3a5dac879094 100644 --- a/drivers/usb/serial/generic.c +++ b/drivers/usb/serial/generic.c @@ -570,6 +570,16 @@ void usb_serial_handle_dcd_change(struct usb_serial_port *usb_port, dev_dbg(&usb_port->dev, "%s - status %d\n", __func__, status); + if (tty) { + struct tty_ldisc *ld = tty_ldisc_ref(tty); + + if (ld) { + if (ld->ops->dcd_change) + ld->ops->dcd_change(tty, status); + tty_ldisc_deref(ld); + } + } + if (status) wake_up_interruptible(&port->open_wait); else if (tty && !C_CLOCAL(tty)) |