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

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Message-ID: <20160613212116.GA10478@amd>
Date:	Mon, 13 Jun 2016 23:21:16 +0200
From:	Pavel Machek <pavel@....cz>
To:	João Paulo Rechi Vita <jprvita@...il.com>
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 Mon 2016-06-13 17:10:02, João Paulo Rechi Vita wrote:
> 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.

(Actually, "::wifi" is super confusing, I'd expect that to be a led
that blinks when wifi is active.)

Well... "airplane" is quite confusing. I'd we use "rfkill" for
disabling radios, and I believe we should stick with that.

But small problem might be polarity. You may need both "::rfkill" and
"::not-rfkill".

Best regards,
									Pavel

-- 
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