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

[Baolin Wang]

On 22 September 2016 at 18:58, Mark Brown <broonie@xxxxxxxxxx> wrote:
> On Thu, Sep 22, 2016 at 06:53:12PM +0800, Baolin Wang wrote:
>> From: Badhri Jagan Sridharan <Badhri@xxxxxxxxxx>
>>
>> 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@xxxxxxxxxx>
>> Signed-off-by: Baolin Wang <baolin.wang@xxxxxxxxxx>
>
> 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