[ 16/75] qcserial: bind to DM/DIAG port on Gobi 1K devices

[Greg Kroah-Hartman]

3.8-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Dan Williams <dcbw@xxxxxxxxxx>

commit 3f8bc5e4da29c7e05edeca6b475abb4fb01a5a13 upstream.

Turns out we just need altsetting 1 and then we can talk to it.

Signed-off-by: Dan Williams <dcbw@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 drivers/usb/serial/qcserial.c |    7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

--- a/drivers/usb/serial/qcserial.c
+++ b/drivers/usb/serial/qcserial.c
@@ -197,12 +197,15 @@ static int qcprobe(struct usb_serial *se
 
 	if (is_gobi1k) {
 		/* Gobi 1K USB layout:
-		 * 0: serial port (doesn't respond)
+		 * 0: DM/DIAG (use libqcdm from ModemManager for communication)
 		 * 1: serial port (doesn't respond)
 		 * 2: AT-capable modem port
 		 * 3: QMI/net
 		 */
-		if (ifnum == 2)
+		if (ifnum == 0) {
+			dev_dbg(dev, "Gobi 1K DM/DIAG interface found\n");
+			altsetting = 1;
+		} else if (ifnum == 2)
 			dev_dbg(dev, "Modem port found\n");
 		else
 			altsetting = -1;


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