netdev - Re: [RFC PATCH] rtl8187: Fix led support for rfkill

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Date:	Sun, 27 Mar 2011 17:47:36 -0500
From:	Larry Finger <Larry.Finger@...inger.net>
To:	Hin-Tak Leung <htl10@...rs.sourceforge.net>
CC:	wu zhangjin <wuzhangjin@...il.com>,
	Herton Ronaldo Krzesinski <herton@...onical.com>,
	linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
	Roman Mamedov <rm@...anrm.ru>
Subject: Re: [RFC PATCH] rtl8187: Fix led support for rfkill

On 03/26/2011 07:55 PM, Hin-Tak Leung wrote:
> wu zhangjin wrote:
>> On Sun, Mar 27, 2011 at 5:33 AM, Hin-Tak Leung
>> <htl10@...rs.sourceforge.net> wrote:
>>> Wu Zhangjin wrote:
>>>> led can not be turned off normally when rfkill is blocked, the cause is
>>>> the led_turn_off() function exit as not expected:
>>> Hmm. While this sounds more sensible, is it needed? And what does the
>>> windows driver do?
>>>
>>> I think there are two kind of LEDs - one that comes on and off with the
>>> rfkill switch; Larry or Herton makes the 2nd one, if there is one, blink
>>> while there is traffic (and stay steady on otherwise).
>>
>> I have used this driver on the YeeLoong netbook(only support Linux),
>> there is only one LED for rtl8187, when there is traffic, it blinks
>> perfectly, but If press the hotkey to turn off the rf, the network
>> interface is down, but the LED is still light, then, the users may
>> mistakenly think the hotkey or rfkill support doesn't work or simply
>> think the interface is still on. So, that's why we may need to fix it.
>
> My laptop (a Toshiba one) has the other kind of LED - the LED only comes on and
> off in relation to the rfkill switch, and does not blink with traffic. I think
> Herton or Larry has some devices with both types.
>
> Hmm, I seem to have the impression that there is code somewhere for switching a
> singular LED's behavior of the driver between one or the other, by echo'ing into
> sysfs or some other trickery? Or would that be a desired approach if that's not
> done at the moment?

My rtl8187 devices are both external USB sticks, thus they have no interaction 
with a radio-kill switch. I will test your patch to make sure it does no harm to 
my system.

I think the commit message should be revised. A simple statement like "the LED 
does not turn off when the rfkill switch is off" should be sufficient.

Larry

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