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qmi_wwan: Support dynamic config on Quectel EP06 

Quectel EP06 (and EM06/EG06) supports dynamic configuration of USB
interfaces, without the device changing VID/PID or configuration number.
When the configuration is updated and interfaces are added/removed, the
interface numbers change. This means that the current code for matching
EP06 does not work.

This patch removes the current EP06 interface number match, and replaces
it with a match on class, subclass and protocol. Unfortunately, matching
on those three alone is not enough, as the diag interface exports the
same values as QMI. The other serial interfaces + adb export different
values and do not match.

The diag interface only has two endpoints, while the QMI interface has
three. I have therefore added a check for number of interfaces, and we
ignore the interface if the number of endpoints equals two.

Signed-off-by: Kristian Evensen <kristian.evensen@gmail.com>
Acked-by: Bjørn Mork <bjorn@mork.no>
Acked-by: Dan Williams <dcbw@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Kristian Evensen 2018-09-08 13:50:48 +02:00 committed by David S. Miller
parent 3ebb17446b
commit 7c5cca3588
1 changed files with 29 additions and 1 deletions
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30
drivers/net/usb/qmi_wwan.c
View File

@ -967,6 +967,13 @@ static const struct usb_device_id products[] = {
USB_DEVICE_AND_INTERFACE_INFO(0x03f0, 0x581d, USB_CLASS_VENDOR_SPEC, 1, 7),
.driver_info = (unsigned long)&qmi_wwan_info,
},
{ /* Quectel EP06/EG06/EM06 */
USB_DEVICE_AND_INTERFACE_INFO(0x2c7c, 0x0306,
USB_CLASS_VENDOR_SPEC,
USB_SUBCLASS_VENDOR_SPEC,
0xff),
.driver_info = (unsigned long)&qmi_wwan_info_quirk_dtr,
},
/* 3. Combined interface devices matching on interface number */
{QMI_FIXED_INTF(0x0408, 0xea42, 4)}, /* Yota / Megafon M100-1 */
@ -1255,7 +1262,6 @@ static const struct usb_device_id products[] = {
{QMI_QUIRK_SET_DTR(0x2c7c, 0x0121, 4)}, /* Quectel EC21 Mini PCIe */
{QMI_QUIRK_SET_DTR(0x2c7c, 0x0191, 4)}, /* Quectel EG91 */
{QMI_FIXED_INTF(0x2c7c, 0x0296, 4)}, /* Quectel BG96 */
{QMI_QUIRK_SET_DTR(0x2c7c, 0x0306, 4)}, /* Quectel EP06 Mini PCIe */
/* 4. Gobi 1000 devices */
{QMI_GOBI1K_DEVICE(0x05c6, 0x9212)}, /* Acer Gobi Modem Device */
@ -1331,6 +1337,19 @@ static bool quectel_ec20_detected(struct usb_interface *intf)
return false;
}
static bool quectel_ep06_diag_detected(struct usb_interface *intf)
{
struct usb_device *dev = interface_to_usbdev(intf);
struct usb_interface_descriptor intf_desc = intf->cur_altsetting->desc;
if (le16_to_cpu(dev->descriptor.idVendor) == 0x2c7c &&
le16_to_cpu(dev->descriptor.idProduct) == 0x0306 &&
intf_desc.bNumEndpoints == 2)
return true;
return false;
}
static int qmi_wwan_probe(struct usb_interface *intf,
const struct usb_device_id *prod)
{
@ -1365,6 +1384,15 @@ static int qmi_wwan_probe(struct usb_interface *intf,
return -ENODEV;
}
/* Quectel EP06/EM06/EG06 supports dynamic interface configuration, so
* we need to match on class/subclass/protocol. These values are
* identical for the diagnostic- and QMI-interface, but bNumEndpoints is
* different. Ignore the current interface if the number of endpoints
* the number for the diag interface (two).
*/
if (quectel_ep06_diag_detected(intf))
return -ENODEV;
return usbnet_probe(intf, id);
}