netdev - Re: [PATCH net-next 5/5] igc: Export LEDs

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <f42099b8-5ba3-3514-e5fa-8d1be37192b5@gmail.com>
Date:   Mon, 19 Jul 2021 00:10:52 +0200
From:   Heiner Kallweit <hkallweit1@...il.com>
To:     Andrew Lunn <andrew@...n.ch>,
        Tony Nguyen <anthony.l.nguyen@...el.com>,
        Kurt Kanzenbach <kurt@...utronix.de>
Cc:     davem@...emloft.net, kuba@...nel.org, netdev@...r.kernel.org,
        sasha.neftin@...el.com, vitaly.lifshits@...el.com,
        vinicius.gomes@...el.com,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Dvora Fuxbrumer <dvorax.fuxbrumer@...ux.intel.com>
Subject: Re: [PATCH net-next 5/5] igc: Export LEDs

On 16.07.2021 23:56, Andrew Lunn wrote:
> On Fri, Jul 16, 2021 at 02:24:27PM -0700, Tony Nguyen wrote:
>> From: Kurt Kanzenbach <kurt@...utronix.de>
>>
>> Each i225 has three LEDs. Export them via the LED class framework.
>>
>> Each LED is controllable via sysfs. Example:
>>
>> $ cd /sys/class/leds/igc_led0
>> $ cat brightness      # Current Mode
>> $ cat max_brightness  # 15
>> $ echo 0 > brightness # Mode 0
>> $ echo 1 > brightness # Mode 1
>>
>> The brightness field here reflects the different LED modes ranging
>> from 0 to 15.
> 
> What do you mean by mode? Do you mean blink mode? Like On means 1G
> link, and it blinks for packet TX?
> 
Supposedly mode refers to a 4-bit bitfield in a LED control register
where each value 0 .. 15 stands for a different blink mode.
So you would need the datasheet to know which value to set.

>     Andrew
> 
Heiner