linux-kernel - Re: [PATCH] usb: gadget: Add uevent to notify userspace

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Message-ID: <CAMz4kuJQrkFvpfTbeQbf1ti_0ECvK7EMNkytu8Rbu0BY19FLWA@mail.gmail.com>
Date:   Thu, 22 Sep 2016 19:07:12 +0800
From:   Baolin Wang <baolin.wang@...aro.org>
To:     Mark Brown <broonie@...nel.org>
Cc:     Felipe Balbi <balbi@...nel.org>,
        Greg KH <gregkh@...uxfoundation.org>,
        Badhri Jagan Sridharan <Badhri@...gle.com>,
        USB <linux-usb@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] usb: gadget: Add uevent to notify userspace

On 22 September 2016 at 18:58, Mark Brown <broonie@...nel.org> wrote:
> On Thu, Sep 22, 2016 at 06:53:12PM +0800, Baolin Wang wrote:
>> From: Badhri Jagan Sridharan <Badhri@...gle.com>
>>
>> Some USB managament on userspace (like Android system) rely on the uevents
>> generated by the composition driver to generate user notifications. Thus this
>> patch adds uevents to be generated whenever USB changes its state: connected,
>> disconnected, configured.
>>
>> The original code was created by Badhri Jagan Sridharan, and I did some
>> optimization.
>>
>> CC: Badhri Jagan Sridharan <Badhri@...gle.com>
>> Signed-off-by: Baolin Wang <baolin.wang@...aro.org>
>
> If you're sending a patch someone else wrote you need their
> Signed-off-by - if they didn't provide one you need to talk to them
> about that and get it.

Ah, I missed that. I will add it if there are no objection from Badhr.i

>
>> +config USB_CONFIGFS_UEVENT
>> +     boolean "Uevent notification of Gadget state"
>> +     depends on USB_CONFIGFS
>> +     help
>> +       Enable uevent notifications to userspace when the gadget
>> +       state changes. The gadget can be in any of the following
>> +       three states: "CONNECTED/DISCONNECTED/CONFIGURED"
>
> Why not just generate the events unconditionally?

If userspace doesn't need notification, then we can save some time to
do the enumeration without the uevent things.

-- 
Baolin.wang
Best Regards