netdev - Re: [RESEND PATCH 1/3] rfkill: Create "rfkill-airplane-mode" LED trigger

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Date:	Mon, 13 Jun 2016 17:10:02 -0400
From:	João Paulo Rechi Vita <jprvita@...il.com>
To:	Pavel Machek <pavel@....cz>
Cc:	Johannes Berg <johannes@...solutions.net>,
	"David S. Miller" <davem@...emloft.net>,
	Darren Hart <dvhart@...radead.org>,
	linux-wireless <linux-wireless@...r.kernel.org>,
	Network Development <netdev@...r.kernel.org>,
	platform-driver-x86@...r.kernel.org, linux-api@...r.kernel.org,
	linux-doc@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
	linux@...lessm.com,
	João Paulo Rechi Vita <jprvita@...lessm.com>
Subject: Re: [RESEND PATCH 1/3] rfkill: Create "rfkill-airplane-mode" LED trigger

On 13 June 2016 at 17:01, Pavel Machek <pavel@....cz> wrote:
> On Mon 2016-06-13 15:59:35, João Paulo Rechi Vita wrote:
>> On 13 June 2016 at 15:00, Pavel Machek <pavel@....cz> wrote:
>> > Hi!
>> >
>> >> > João, that means you should send a patch to add the ::rfkill suffix.
>> >> >
>> >>
>> >> IMO "airplane" (or maybe "airplane-mode") is a better suffix, as it
>> >> reflects the label on the machine's chassis. I'll name it
>> >> "asus-wireless::airplane" and send this through platform-drivers-x86,
>> >> as this is now contained in the platform-drivers-x86 subsystem. Thanks
>> >> Johannes for your patience and help designing and reviewing the rfkill
>> >> changes, even if not all of them made it through in the end. And
>> >> thanks everyone else involved for the feedback.
>> >
>> > Actually, I'd do '::rfkill', for consistency with other places in
>> > /sys.
>> >
>> > /sys/devices/platform/thinkpad_acpi/rfkill/rfkill1/name
>> > /sys/class/rfkill
>> > /sys/module/rfkill
>> >
>>
>> If we use "rfkill" as a suffix, how do you expect userspace to be able
>> to differentiate between a LED that indicates airplane-mode (LED ON
>> when all radios are OFF) and a LED that indicates the state of a
>> specific radio like WiFi or Bluetooth (LED ON when that specific radio
>> is ON)? If we're going this route we should provide meaningful
>> information here.
>
> '::airplane' has same problem, no?
>

No, because in this case we would not use "airplane" as a suffix for a
LED associated with an individual radio.

> If you want to distinguish that, maybe you can do '::rfkill' for
> everything vs '::rfkill-wifi' for wifi-only and '::rfkill-bt' for
> bluetooth...
>

The problem here is that the "rfkill" name is already associated with
individual rfkill switches under /sys/class/rfkill,
/sys/devices/platform/*/rfkill etc, so I think we're better off
distinguishing "airplane" vs "wifi" vs "bluetooth" etc, to avoid
confusion.

--
João Paulo Rechi Vita
http://about.me/jprvita