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net: cdc_ncm: add Huawei devices 

A number of Huawei 3G and LTE modems implement a CDC NCM function,
including the necessary functional descriptors, but using a non
standard interface layout and class/subclass/protocol codes.

These devices can be handled by this driver with only a minor
change to the probing logic, allowing a single combined control
and data interface.  This works because the devices
- include a CDC Union descriptor labelling the combined
  interface as both master and slave, and
- have an alternate setting #1 for the bulk endpoints on the
  combined interface.

The 3G/LTE network connection is managed by vendor specific AT
commands on a serial function in the same composite device.
Handling the managment function is out of the scope of this
driver.  It will be handled by an appropriate USB serial
driver.

Reported-and-Tested-by: Olof Ermis <olof.ermis@gmail.com>
Reported-and-Tested-by: Tommy Cheng <tommy7765@yahoo.com>
Signed-off-by: Bjørn Mork <bjorn@mork.no>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Bjørn Mork 2012-11-13 03:19:43 +00:00 committed by David S. Miller
parent 7702745b15
commit bbc8d9228e
1 changed files with 18 additions and 4 deletions
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22
drivers/net/usb/cdc_ncm.c
View File

@ -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),