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cdc_ether: Identify MBM devices by GUID in MDLM descriptor
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This patch removes vid/pid for Ericsson MBM devices from the whitelist set of
devices. The MBM devices are instead identified by GUID.

In order for cdc_ether to handle these devices the GUID in the MDLM descriptor
is tested. All MBM devices currently handled by cdc_ether as well as future
CDC Ethernet MBM devices can be identified by the GUID.

This is the same solution used in Carl Nordbeck's mbm driver,
http://kerneltrap.org/mailarchive/linux-usb/2008/11/17/4141384/thread

I post this as RFC to get feedback on however cdc_ether is the correct place to
do the binding, or if it should be done in a separate driver, e.g. zaurus.

Signed-off-by: Jonas Sjöquist <jonas.sjoquist@ericsson.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Jonas Sjöquist authored and David S. Miller committed Apr 30, 2010
1 parent 81a2e36 commit 2185126
Showing 1 changed file with 39 additions and 74 deletions.
113 changes: 39 additions & 74 deletions drivers/net/usb/cdc_ether.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -64,6 +64,11 @@ static int is_wireless_rndis(struct usb_interface_descriptor *desc)

#endif

static const u8 mbm_guid[16] = {
0xa3, 0x17, 0xa8, 0x8b, 0x04, 0x5e, 0x4f, 0x01,
0xa6, 0x07, 0xc0, 0xff, 0xcb, 0x7e, 0x39, 0x2a,
};

/*
* probes control interface, claims data interface, collects the bulk
* endpoints, activates data interface (if needed), maybe sets MTU.
Expand All @@ -79,6 +84,8 @@ int usbnet_generic_cdc_bind(struct usbnet *dev, struct usb_interface *intf)
int status;
int rndis;
struct usb_driver *driver = driver_of(intf);
struct usb_cdc_mdlm_desc *desc = NULL;
struct usb_cdc_mdlm_detail_desc *detail = NULL;

if (sizeof dev->data < sizeof *info)
return -EDOM;
Expand Down Expand Up @@ -229,6 +236,34 @@ int usbnet_generic_cdc_bind(struct usbnet *dev, struct usb_interface *intf)
* side link address we were given.
*/
break;
case USB_CDC_MDLM_TYPE:
if (desc) {
dev_dbg(&intf->dev, "extra MDLM descriptor\n");
goto bad_desc;
}

desc = (void *)buf;

if (desc->bLength != sizeof(*desc))
goto bad_desc;

if (memcmp(&desc->bGUID, mbm_guid, 16))
goto bad_desc;
break;
case USB_CDC_MDLM_DETAIL_TYPE:
if (detail) {
dev_dbg(&intf->dev, "extra MDLM detail descriptor\n");
goto bad_desc;
}

detail = (void *)buf;

if (detail->bGuidDescriptorType == 0) {
if (detail->bLength < (sizeof(*detail) + 1))
goto bad_desc;
} else
goto bad_desc;
break;
}
next_desc:
len -= buf [0]; /* bLength */
Expand Down Expand Up @@ -542,80 +577,10 @@ static const struct usb_device_id products [] = {
USB_CDC_PROTO_NONE),
.driver_info = (unsigned long) &cdc_info,
}, {
/* Ericsson F3507g */
USB_DEVICE_AND_INTERFACE_INFO(0x0bdb, 0x1900, USB_CLASS_COMM,
USB_CDC_SUBCLASS_MDLM, USB_CDC_PROTO_NONE),
.driver_info = (unsigned long) &mbm_info,
}, {
/* Ericsson F3507g ver. 2 */
USB_DEVICE_AND_INTERFACE_INFO(0x0bdb, 0x1902, USB_CLASS_COMM,
USB_CDC_SUBCLASS_MDLM, USB_CDC_PROTO_NONE),
.driver_info = (unsigned long) &mbm_info,
}, {
/* Ericsson F3607gw */
USB_DEVICE_AND_INTERFACE_INFO(0x0bdb, 0x1904, USB_CLASS_COMM,
USB_CDC_SUBCLASS_MDLM, USB_CDC_PROTO_NONE),
.driver_info = (unsigned long) &mbm_info,
}, {
/* Ericsson F3607gw ver 2 */
USB_DEVICE_AND_INTERFACE_INFO(0x0bdb, 0x1905, USB_CLASS_COMM,
USB_CDC_SUBCLASS_MDLM, USB_CDC_PROTO_NONE),
.driver_info = (unsigned long) &mbm_info,
}, {
/* Ericsson F3607gw ver 3 */
USB_DEVICE_AND_INTERFACE_INFO(0x0bdb, 0x1906, USB_CLASS_COMM,
USB_CDC_SUBCLASS_MDLM, USB_CDC_PROTO_NONE),
.driver_info = (unsigned long) &mbm_info,
}, {
/* Ericsson F3307 */
USB_DEVICE_AND_INTERFACE_INFO(0x0bdb, 0x190a, USB_CLASS_COMM,
USB_CDC_SUBCLASS_MDLM, USB_CDC_PROTO_NONE),
.driver_info = (unsigned long) &mbm_info,
}, {
/* Ericsson F3307 ver 2 */
USB_DEVICE_AND_INTERFACE_INFO(0x0bdb, 0x1909, USB_CLASS_COMM,
USB_CDC_SUBCLASS_MDLM, USB_CDC_PROTO_NONE),
.driver_info = (unsigned long) &mbm_info,
}, {
/* Ericsson C3607w */
USB_DEVICE_AND_INTERFACE_INFO(0x0bdb, 0x1049, USB_CLASS_COMM,
USB_CDC_SUBCLASS_MDLM, USB_CDC_PROTO_NONE),
.driver_info = (unsigned long) &mbm_info,
}, {
/* Ericsson C3607w ver 2 */
USB_DEVICE_AND_INTERFACE_INFO(0x0bdb, 0x190b, USB_CLASS_COMM,
USB_CDC_SUBCLASS_MDLM, USB_CDC_PROTO_NONE),
.driver_info = (unsigned long) &mbm_info,
}, {
/* Toshiba F3507g */
USB_DEVICE_AND_INTERFACE_INFO(0x0930, 0x130b, USB_CLASS_COMM,
USB_CDC_SUBCLASS_MDLM, USB_CDC_PROTO_NONE),
.driver_info = (unsigned long) &mbm_info,
}, {
/* Toshiba F3607gw */
USB_DEVICE_AND_INTERFACE_INFO(0x0930, 0x130c, USB_CLASS_COMM,
USB_CDC_SUBCLASS_MDLM, USB_CDC_PROTO_NONE),
.driver_info = (unsigned long) &mbm_info,
}, {
/* Toshiba F3607gw ver 2 */
USB_DEVICE_AND_INTERFACE_INFO(0x0930, 0x1311, USB_CLASS_COMM,
USB_CDC_SUBCLASS_MDLM, USB_CDC_PROTO_NONE),
.driver_info = (unsigned long) &mbm_info,
}, {
/* Dell F3507g */
USB_DEVICE_AND_INTERFACE_INFO(0x413c, 0x8147, USB_CLASS_COMM,
USB_CDC_SUBCLASS_MDLM, USB_CDC_PROTO_NONE),
.driver_info = (unsigned long) &mbm_info,
}, {
/* Dell F3607gw */
USB_DEVICE_AND_INTERFACE_INFO(0x413c, 0x8183, USB_CLASS_COMM,
USB_CDC_SUBCLASS_MDLM, USB_CDC_PROTO_NONE),
.driver_info = (unsigned long) &mbm_info,
}, {
/* Dell F3607gw ver 2 */
USB_DEVICE_AND_INTERFACE_INFO(0x413c, 0x8184, USB_CLASS_COMM,
USB_CDC_SUBCLASS_MDLM, USB_CDC_PROTO_NONE),
.driver_info = (unsigned long) &mbm_info,
USB_INTERFACE_INFO(USB_CLASS_COMM, USB_CDC_SUBCLASS_MDLM,
USB_CDC_PROTO_NONE),
.driver_info = (unsigned long)&mbm_info,

},
{ }, // END
};
Expand Down

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