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I have problem with my new Huawei E3276 USB modem. I have found a solution which I quote (original post: https://answers.launchpad.net/ubuntu/+source/gnome-nettool/+question/211095):

"With the support of linux community the Huawei E3276 is supported now (see thread here http://lists.freedesktop.org/archives/libqmi-devel/2012-November/thread.html) . You need an updated cdc_ncm.ko driver and then connect with

echo -e "AT^NDISDUP=1,1,\"online.telia.se\"\r" > /dev/ttyUSB0
dhclient wwan0

Assuming you have configured usb modeswitch beforehand with:

echo "12d1 1506" > /sys/bus/usb-serial/drivers/option1/new_id

Works with Telia in Sweden.

Bjorn will push this into the linux main branch soon, but if you are eager to hack, you can update

drivers/net/usb/cdc_ncm.c 

with this:

diff --git a/drivers/net/usb/cdc_ncm.c b/drivers/net/usb/cdc_ncm.c
index 4cd582a..74fab1a 100644
--- a/drivers/net/usb/cdc_ncm.c
+++ b/drivers/net/usb/cdc_ncm.c
@@ -540,10 +540,12 @@ advance:
  (ctx->ether_desc == NULL) || (ctx->control != intf))
   goto error;

- /* claim interfaces, if any */
- temp = usb_driver_claim_interface(driver, ctx->data, dev);
- if (temp)
- goto error;
+ /* claim data interface, if different from control */
+ if (ctx->data != ctx->control) {
+ temp = usb_driver_claim_interface(driver, ctx->data, dev);
+ if (temp)
+ goto error;
+ }

  iface_no = ctx->data->cur_altsetting->desc.bInterfaceNumber;

@@ -623,6 +625,10 @@ static void cdc_ncm_unbind(struct usbnet *dev, struct usb_interface *intf)

  tasklet_kill(&ctx->bh);

+ /* handle devices with combined control and data interface */
+ if (ctx->control == ctx->data)
+ ctx->data = NULL;
+
   /* disconnect master --> disconnect slave */
  if (intf == ctx->control && ctx->data) {
   usb_set_intfdata(ctx->data, NULL);
@@ -1245,6 +1251,14 @@ static const struct usb_device_id cdc_devs[] = {
     .driver_info = (unsigned long) &wwan_info,
  },

+ /* Huawei NCM devices disguised as vendor specific */
+ { USB_VENDOR_AND_INTERFACE_INFO(0x12d1, 0xff, 0x02, 0x16),
+ .driver_info = (unsigned long)&wwan_info,
+ },
+ { USB_VENDOR_AND_INTERFACE_INFO(0x12d1, 0xff, 0x02, 0x46),
+ .driver_info = (unsigned long)&wwan_info,
+ },
+
  /* Generic CDC-NCM devices */
  { USB_INTERFACE_INFO(USB_CLASS_COMM,
   USB_CDC_SUBCLASS_NCM, USB_CDC_PROTO_NONE),"

I have a fresh installation of Ubuntu 12.10 and my problem is first of all I don't know how to edit in

drivers/net/usb/cdc_ncm.c. 

Do I have to install something before I can edit cdc_ncm.c? Thanks for your help!

share|improve this question
    
Can you post the output of $ lsusb? I have it working this is what I have. Bus 002 Device 018: ID 12d1:1506 Huawei Technologies Co., Ltd. E398 LTE/UMTS/GSM Modem/Networkcard –  Jaseem Sep 11 '13 at 7:03
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