* [PATCH 1/2] USB : serial : call handle_dcd_change in ftdi driver.
2013-09-16 6:40 [PATCH 0/2] Enable PPS reporting for USB serial devices (v3) Paul Chavent
@ 2013-09-16 6:40 ` Paul Chavent
2013-09-16 6:41 ` [PATCH 2/2] USB : serial : invoke dcd_change ldisc's handler Paul Chavent
1 sibling, 0 replies; 4+ messages in thread
From: Paul Chavent @ 2013-09-16 6:40 UTC (permalink / raw)
To: linux-usb, gregkh, jhovold, fschaefer.oss, jslaby, max, giometti
Cc: linux-kernel, Paul Chavent
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>
---
drivers/usb/serial/ftdi_sio.c | 10 +++++++++-
1 file changed, 9 insertions(+), 1 deletion(-)
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 @@ 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;
--
1.7.12.1
^ permalink raw reply related [flat|nested] 4+ messages in thread* [PATCH 2/2] USB : serial : invoke dcd_change ldisc's handler.
2013-09-16 6:40 [PATCH 0/2] Enable PPS reporting for USB serial devices (v3) Paul Chavent
2013-09-16 6:40 ` [PATCH 1/2] USB : serial : call handle_dcd_change in ftdi driver Paul Chavent
@ 2013-09-16 6:41 ` Paul Chavent
2013-09-16 8:08 ` Rodolfo Giometti
1 sibling, 1 reply; 4+ messages in thread
From: Paul Chavent @ 2013-09-16 6:41 UTC (permalink / raw)
To: linux-usb, gregkh, jhovold, fschaefer.oss, jslaby, max, giometti
Cc: linux-kernel, Paul Chavent
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>
---
Documentation/pps/pps.txt | 15 +++++++++++++++
drivers/usb/serial/generic.c | 10 ++++++++++
2 files changed, 25 insertions(+)
diff --git a/Documentation/pps/pps.txt b/Documentation/pps/pps.txt
index d35dcdd..c03b1be 100644
--- a/Documentation/pps/pps.txt
+++ b/Documentation/pps/pps.txt
@@ -66,6 +66,21 @@ In LinuxPPS the PPS sources are simply char devices usually mapped
into files /dev/pps0, /dev/pps1, etc..
+PPS with USB to serial devices
+------------------------------
+
+It is possible to grab the PPS from an USB to serial device. However,
+you should take into account the latencies and jitter introduced by
+the USB stack. Users has reported clock instability around +-1ms when
+synchronized with PPS through USB. This isn't suited for time server
+synchronization.
+
+If your device doesn't report PPS, you can check that the feature is
+supported by its driver. Most of the time, you only need to add a call
+to usb_serial_handle_dcd_change after checking the DCD status (see
+ch341 and pl2303 examples).
+
+
Coding example
--------------
diff --git a/drivers/usb/serial/generic.c b/drivers/usb/serial/generic.c
index 1f31e6b..3a5dac8 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))
--
1.7.12.1
^ permalink raw reply related [flat|nested] 4+ messages in thread