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Message-ID: <60d24f69.1c69fb81.fcc6c.14d6@mx.google.com>
Date:   Wed, 23 Jun 2021 00:00:24 +0300
From:   Hannu Hartikainen <hannu@hrtk.in>
Subject: Re: [PATCH] USB: cdc-acm: blacklist Heimann USB Appset device
To:     Greg KH <gregkh@linuxfoundation.org>
Cc:     linux-usb@vger.kernel.org, Oliver Neukum <oneukum@suse.com>
In-Reply-To: <YNI/9/gbehhaNC1t@kroah.com>
References: <20210622141454.337948-1-hannu@hrtk.in>
        <YNI/9/gbehhaNC1t@kroah.com>
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On Tue, 22 Jun 2021 21:54:31 +0200, Greg KH <gregkh@linuxfoundation.org> wrote:
> If it's blacklisted here, what driver does control this device?

On my machine, no other device driver takes control. The `usbcore`
driver loads the `cdc-acm` driver because the descriptors match but
after cdc-acm returns without claiming the interfaces, no other driver
is probed AFAICT.

I've written an incomplete driver myself; I'll see if I can publish it
later. But the traffic is just USB bulk messages and should be doable in
userspace without a driver. Sadly the devices are not very common and
the USB traffic is undocumented.

Best,
Hannu