linux-kernel - Re: [PATCH v6 2/2] trigger: ledtrig-tty: add additional modes

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Date:   Wed, 22 Feb 2023 09:13:22 +0100
From:   Jiri Slaby <jirislaby@...nel.org>
To:     Florian Eckert <fe@....tdt.de>, u.kleine-koenig@...gutronix.de,
        gregkh@...uxfoundation.org, pavel@....cz, lee@...nel.org
Cc:     linux-kernel@...r.kernel.org, linux-leds@...r.kernel.org,
        Eckert.Florian@...glemail.com
Subject: Re: [PATCH v6 2/2] trigger: ledtrig-tty: add additional modes

On 22. 02. 23, 8:55, Florian Eckert wrote:
> Add additional modes to trigger the selected LED.
> The following modes are supported:
> 
> Tx/Rx:	Flash LED on data transmission (default)
> CTS:	DCE Ready to accept data from the DTE.
> DSR:	DCE is ready to receive and send data.
> CAR:	DCE is receiving a carrier from a remote DTE.
> RNG:	DCE has detected an incoming ring signal.
> 
> The mode can be changed for example with the following command:
> echo "CTS" > /sys/class/leds/<led>/mode
> 
> This would turn on the LED, when the DTE(modem) signals the DCE that it
> is ready to accept data.
> 
> Signed-off-by: Florian Eckert <fe@....tdt.de>
> ---
>   .../ABI/testing/sysfs-class-led-trigger-tty   |  16 ++
>   drivers/leds/trigger/ledtrig-tty.c            | 145 ++++++++++++++++--
>   2 files changed, 146 insertions(+), 15 deletions(-)
> 
> diff --git a/Documentation/ABI/testing/sysfs-class-led-trigger-tty b/Documentation/ABI/testing/sysfs-class-led-trigger-tty
> index 2bf6b24e781b..4023585d3acf 100644
> --- a/Documentation/ABI/testing/sysfs-class-led-trigger-tty
> +++ b/Documentation/ABI/testing/sysfs-class-led-trigger-tty
> @@ -4,3 +4,19 @@ KernelVersion:	5.10
>   Contact:	linux-leds@...r.kernel.org
>   Description:
>   		Specifies the tty device name of the triggering tty
> +
> +What:		/sys/class/leds/<led>/mode
> +Date:		January 2023
> +KernelVersion:	6.3
> +Description:
> +		Specifies the operating to trigger the LED.
> +		The following operating modes are supported:

Here, you should add a \n. Otherwise it won't start the list properly. 
Check the output e.g. by:
make htmldocs SPHINXDIRS="admin-guide"

then open the built result in a browser:
Documentation/output/admin-guide/abi-testing.html#abi-sys-class-leds-led-mode

> +		* Tx/Rx: Flash LED on data transmission (default)
> +		* CTS:   DCE Ready to accept data from the DTE.
> +		  LED on if line is high.
> +		* DSR:   DCE is ready to receive and send data.
> +		  LED on if line is high.
> +		* CAR:   DCE has detected a carrier from a remote DTE.
> +		  LED on if line is high.
> +		* RNG:   DCE has detected an incoming ring signal.
> +		  LED on if line is high.


-- 
js
suse labs