linux-kernel - Re: [Patch v8 6/6] leds: ledtrig-tty: add additional line state evaluation

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Date:   Mon, 20 Nov 2023 08:21:27 +0100
From:   Florian Eckert <fe@....tdt.de>
To:     Lee Jones <lee@...nel.org>
Cc:     m.brock@...mierlo.com, Eckert.Florian@...glemail.com,
        gregkh@...uxfoundation.org, jirislaby@...nel.org, pavel@....cz,
        kabel@...nel.org, u.kleine-koenig@...gutronix.de,
        linux-kernel@...r.kernel.org, linux-serial@...r.kernel.org,
        linux-leds@...r.kernel.org
Subject: Re: [Patch v8 6/6] leds: ledtrig-tty: add additional line state
 evaluation



On 2023-11-17 13:12, Lee Jones wrote:
> On Thu, 09 Nov 2023, m.brock@...mierlo.com wrote:
> 
>> Florian Eckert schreef op 2023-11-09 09:50:
>> > The serial tty interface also supports additional input signals, that
>> > can also be evaluated within this trigger. This change is adding the
>> > following additional input sources, which could be controlled
>> > via the '/sys/class/<leds>/' sysfs interface.
>> >
>> > Explanation:
>> > DCE = Data Communication Equipment (Modem)
>> > DTE = Data Terminal Equipment (Computer)
>> >
>> > - cts:
>> >   DCE is ready to accept data from the DTE (CTS = Clear To Send). If
>> >   the line state is detected, the LED is switched on.
>> >   If set to 0 (default), the LED will not evaluate CTS.
>> >   If set to 1, the LED will evaluate CTS.
>> >
>> > - dsr:
>> >   DCE is ready to receive and send data (DSR = Data Set Ready). If the
>> >   line state is detected, the LED is switched on.
>> >   If set to 0 (default), the LED will not evaluate DSR.
>> >   If set to 1, the LED will evaluate DSR.
>> >
>> > - dcd:
>> >   DTE is receiving a carrier from the DCE (DCD = Data Carrier Detect).
>> >   If the line state is detected, the LED is switched on.
>> >   If set to 0 (default), the LED will not evaluate DCD.
>> >   If set to 1, the LED will evaluate DCD.
>> >
>> > - rng:
>> >   DCE has detected an incoming ring signal on the telephone line
>> >   (RNG = Ring Indicator). If the line state is detected, the LED is
>> >   switched on.
>> >   If set to 0 (default), the LED will not evaluate RNG.
>> >   If set to 1, the LED will evaluate RNG.
>> >
>> > Also add an invert flag on LED blink, so that the LED blinks in the
>> > correct order.
>> >
>> > * If one off the new enabled input signals are evaluatet as 'enabled',
>> >   and data are transmitted, then the LED should first blink 'off' and
>> >   then 'on' (invert).
>> > * If all the new enabled input signals are evaluatet as 'disabled',
>> >   and data are transmitted, then the LED should first blink 'on' and
>> >   then 'off'.
>> >
>> > Signed-off-by: Florian Eckert <fe@....tdt.de>
>> > ---
>> >  .../ABI/testing/sysfs-class-led-trigger-tty   | 40 ++++++++++
>> >  drivers/leds/trigger/ledtrig-tty.c            | 77 ++++++++++++++++++-
>> >  2 files changed, 116 insertions(+), 1 deletion(-)
> 
> [...]
> 
>> Reviewed-by: Maarten Brock <m.brock@...mierlo.com>
> 
> Please snip your replies.

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