linux-kernel - Re: [PATCH v5 2/2] leds: ledtrig-tty: add new line mode evaluation

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Date:   Mon, 23 Oct 2023 14:45:55 +0200
From:   Florian Eckert <fe@....tdt.de>
To:     Greg KH <gregkh@...uxfoundation.org>
Cc:     Eckert.Florian@...glemail.com, jirislaby@...nel.org, pavel@....cz,
        lee@...nel.org, kabel@...nel.org, u.kleine-koenig@...gutronix.de,
        m.brock@...mierlo.com, linux-kernel@...r.kernel.org,
        linux-serial@...r.kernel.org, linux-leds@...r.kernel.org
Subject: Re: [PATCH v5 2/2] leds: ledtrig-tty: add new line mode evaluation



On 2023-10-23 14:27, Greg KH wrote:
> On Mon, Oct 23, 2023 at 02:15:55PM +0200, Florian Eckert wrote:
>> > Again, I thought we had rx/tx already?  If not, how was that controlled
>> > today?
>> 
>> It could not be controlled! The LED flashed when data where 
>> transferred.
>> This was the only function that the trigger supported.
> 
> Ok, then maybe this needs to be a bit longer of a series.  One that 
> does
> the "tx/rx" feature, as that is needed today, and will be the more
> complex one, and then one-per-line-setting that you want to apply.
> 
> That should make it much easier to review overall, right?

Sorry for asking, but why should I split the change.
What is the added value? But if it is necessary, then I will do it.

Before my change, the trigger could not be configured.
The LED always flashed when data was transferred.
Now I can configure for which tty event the LED should flash or be 
on/off.
So that the trigger behaves the same as before (flash on rx/tx 
transmission),
I set the rx/tx bits in the function ledtrig_tty_activate() with the
following code. Nothing changes for the user of the trigger.

/* Enable default rx/tx LED blink */
set_bit(TRIGGER_TTY_TX, &trigger_data->ttytrigger);
set_bit(TRIGGER_TTY_RX, &trigger_data->ttytrigger);

---
Florian