net: qmi_wwan: add support for ZTE MF820D

ZTE have yet to discover the magic of USB descriptors.  These
devices use ff/ff/ff for class/subclass/protocol regardless of
function, except for usb-storage.  Use an interface number
whitelist to force the driver to bind only to the QMI/wwan
interface.

Signed-off-by: Bjørn Mork <bjorn@mork.no>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/net/usb/qmi_wwan.c b/drivers/net/usb/qmi_wwan.c
index e14479d..aac68f5 100644 (file)
--- a/drivers/net/usb/qmi_wwan.c
+++ b/drivers/net/usb/qmi_wwan.c
@@ -214,6 +214,20 @@ static int qmi_wwan_bind_shared(struct usbnet *dev, struct usb_interface *intf)
        struct usb_driver *subdriver = NULL;
        atomic_t *pmcount = (void *)&dev->data[1];
 
+       /* ZTE makes devices where the interface descriptors and endpoint
+        * configurations of two or more interfaces are identical, even
+        * though the functions are completely different.  If set, then
+        * driver_info->data is a bitmap of acceptable interface numbers
+        * allowing us to bind to one such interface without binding to
+        * all of them
+        */
+       if (dev->driver_info->data &&
+           !test_bit(intf->cur_altsetting->desc.bInterfaceNumber, &dev->driver_info->data)) {
+               dev_info(&intf->dev, "not on our whitelist - ignored");
+               rv = -ENODEV;
+               goto err;
+       }
+
        atomic_set(pmcount, 0);
 
        /* collect all three endpoints */
@@ -341,6 +355,17 @@ static const struct driver_info    qmi_wwan_gobi = {
        .manage_power   = qmi_wwan_manage_power,
 };
 
+/* ZTE suck at making USB descriptors */
+static const struct driver_info        qmi_wwan_force_int4 = {
+       .description    = "Qualcomm Gobi wwan/QMI device",
+       .flags          = FLAG_WWAN,
+       .bind           = qmi_wwan_bind_gobi,
+       .unbind         = qmi_wwan_unbind_shared,
+       .manage_power   = qmi_wwan_manage_power,
+       .data           = BIT(4), /* interface whitelist bitmap */
+};
+
+
 #define HUAWEI_VENDOR_ID       0x12D1
 #define QMI_GOBI_DEVICE(vend, prod) \
        USB_DEVICE(vend, prod), \
@@ -375,6 +400,15 @@ static const struct usb_device_id products[] = {
                .bInterfaceProtocol = 0xff,
                .driver_info        = (unsigned long)&qmi_wwan_shared,
        },
+       {       /* ZTE MF820D */
+               .match_flags        = USB_DEVICE_ID_MATCH_DEVICE | USB_DEVICE_ID_MATCH_INT_INFO,
+               .idVendor           = 0x19d2,
+               .idProduct          = 0x0167,
+               .bInterfaceClass    = 0xff,
+               .bInterfaceSubClass = 0xff,
+               .bInterfaceProtocol = 0xff,
+               .driver_info        = (unsigned long)&qmi_wwan_force_int4,
+       },
        {QMI_GOBI_DEVICE(0x05c6, 0x9212)},      /* Acer Gobi Modem Device */
        {QMI_GOBI_DEVICE(0x03f0, 0x1f1d)},      /* HP un2400 Gobi Modem Device */
        {QMI_GOBI_DEVICE(0x03f0, 0x371d)},      /* HP un2430 Mobile Broadband Module */