• Bjørn Mork's avatar
    net: usb: qmi_wwan: New driver for Huawei QMI based WWAN devices · 9b28ecd6
    Bjørn Mork authored
    Some WWAN LTE/3G devices based on chipsets from Qualcomm provide
    near standard CDC ECM interfaces in addition to the usual serial
    interfaces.   The Huawei E392/E398 are examples of such devices.
    
    These typically cannot be fully configured using AT commands
    over a serial interface.  It is necessary to speak the proprietary
    Qualcomm MSM Interface (QMI) protocol to the device to enable the
    ethernet proxy functionality.
    
    The devices embed the QMI protocol in CDC on the control interface,
    using standard CDC commands and notifications. The do not otherwise
    use CDC commands for the ethernet function.  This driver does
    therefore not need access to any other aspects of the control
    interface than the descriptors attached to it.
    
    Another driver, cdc-wdm, will provide userspace access to the
    QMI protocol independently of this driver.  To facilitate this,
    this driver avoids binding to the control interface, and uses
    only the associated data interface after parsing the common CDC
    functional descriptors on the control interface.
    
    You will want both the cdc-wdm and option drivers as companions to
    this driver, to have full access to all interfaces and protocols
    exported by the device.
    Signed-off-by: default avatarBjørn Mork <bjorn@mork.no>
    Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
    9b28ecd6
qmi_wwan.c 7.17 KB