netdev - Re: [PATCH net-next] qmi_wwan: Add quirk for Quectel dynamic config

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Message-Id: <20190408.162614.1081558072311986562.davem@davemloft.net>
Date:   Mon, 08 Apr 2019 16:26:14 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     kristian.evensen@...il.com
Cc:     netdev@...r.kernel.org, bjorn@...k.no
Subject: Re: [PATCH net-next] qmi_wwan: Add quirk for Quectel dynamic config

From: Kristian Evensen <kristian.evensen@...il.com>
Date: Sun,  7 Apr 2019 15:39:09 +0200

> Most, if not all, Quectel devices use dynamic interface numbers, and
> users are able to change the USB configuration at will. Matching on for
> example interface number is therefore not possible.
> 
> Instead, the QMI device can be identified by looking at the interface
> class, subclass and protocol (all 0xff), as well as the number of
> endpoints. The reason we need to look at the number of endpoints, is
> that the diagnostic port interface has the same class, subclass and
> protocol as QMI. However, the diagnostic port only has two endpoints,
> while QMI has three.
> 
> Until now, we have identified the QMI device by combining a match on
> class, subclass and protocol, with a call to the function
> quectel_diag_detect(). In quectel_diag_detect(), we check if the number
> of endpoints matches for known Quectel vendor/product ids.
> 
> Adding new vendor/product ids to quectel_diag_detect() is not a good
> long-term solution. This commit replaces the function with a quirk, and
> applies the quirk to affected Quectel devices that I have been able to
> test the change with (EP06, EM12 and EC25). If the quirk is set and the
> number of endpoints equal two, we return from qmi_wwan_probe() with
> -ENODEV.
> 
> Signed-off-by: Kristian Evensen <kristian.evensen@...il.com>

Applied.