Hello all,
this patch to qcserial.c enables the Diagnostics Monitor
and NMEA GPS ports on Qualcomm Gobi 2000 devices.
A Gobi 2000 device will provide 3 serial ports:
# /dev/ttyUSB0 -> Diagnostics
# /dev/ttyUSB1 -> 3G Modem
# /dev/ttyUSB2 -> NMEA GPS port
* The Diagnostics Monitor uses Qualcomm's DM protocol; I used
libqcdm (ModemManager) to talk to it, found it working, but at
least DM commands 12 and 64 are not implemented on my device
(Gobi 2000 built into Thinkpad x100e).
* Functionality of the 3G Modem port remains unchanged.
* The GPS port and how to enable it has been confirmed now in the
Gobi 3000 source code at:
https://www.codeaurora.org/patches/quic/gobi/
Enable/disable GPS via:
echo "\$GPS_START" > /dev/ttyUSB2
# use GPS
echo "\$GPS_STOP" > /dev/ttyUSB2
Signed-off-by: Matthias G. Eckermann <mge@xxxxxxxx>
---
diff --git a/drivers/usb/serial/qcserial.c b/drivers/usb/serial/qcserial.c
index 2846ad8..1fac621 100644
--- a/drivers/usb/serial/qcserial.c
+++ b/drivers/usb/serial/qcserial.c
@@ -150,21 +150,50 @@ static int qcprobe(struct usb_serial *serial, const struct usb_device_id *id)
break;
case 3:
case 4:
/* Composite mode */
- if (ifnum == 2) {
+ /* ifnum == 0 is a broadband network adapter */
+ if (ifnum == 1) {
+ /*
+ * Diagnostics Monitor (serial line 9600 8N1)
+ * Qualcomm DM protocol
+ * use "libqcdm" (ModemManager) for communication
+ */
+ dbg("Diagnostics Monitor found");
+ retval = usb_set_interface(serial->dev, ifnum, 0);
+ if (retval < 0) {
+ dev_err(&serial->dev->dev,
+ "Could not set interface, error %d\n",
+ retval);
+ retval = -ENODEV;
+ }
+ } else if (ifnum == 2) {
dbg("Modem port found");
retval = usb_set_interface(serial->dev, ifnum, 0);
if (retval < 0) {
dev_err(&serial->dev->dev,
"Could not set interface, error %d\n",
retval);
retval = -ENODEV;
kfree(data);
}
return retval;
+ } else if (ifnum==3) {
+ /*
+ * NMEA (serial line 9600 8N1)
+ * # echo "\$GPS_START" > /dev/ttyUSBx
+ * # echo "\$GPS_STOP" > /dev/ttyUSBx
+ */
+ dbg("NMEA GPS interface found");
+ retval = usb_set_interface(serial->dev, ifnum, 0);
+ if (retval < 0) {
+ dev_err(&serial->dev->dev,
+ "Could not set interface, error %d\n",
+ retval);
+ retval = -ENODEV;
+ }
}
break;
default:
dev_err(&serial->dev->dev,
--
Voluminous documentation is part of the problem
not part of the solution (Tom DeMarco)
No documentation though is not a solution either
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