netdev - Re: [PATCH] net: usb: qmi_wwan: New driver for Huawei QMI based WWAN devices

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Message-Id: <20120125.170036.1730469043830544127.davem@davemloft.net>
Date:	Wed, 25 Jan 2012 17:00:36 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	bjorn@...k.no
Cc:	netdev@...r.kernel.org, linux-usb@...r.kernel.org,
	marcel@...tmann.org, oliver@...kum.org, dcbw@...hat.com
Subject: Re: [PATCH] net: usb: qmi_wwan: New driver for Huawei QMI based
 WWAN devices

From: Bjørn Mork <bjorn@...k.no>
Date: Fri, 20 Jan 2012 02:37:22 +0100

> 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: Bjørn Mork <bjorn@...k.no>

Applied.
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