linux-kernel - [RFC PATCH 0/1] Add generic inverted led triggers

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Message-Id: <20200308142722.1199260-1-t.schramm@manjaro.org>
Date:   Sun,  8 Mar 2020 15:27:21 +0100
From:   Tobias Schramm <t.schramm@...jaro.org>
To:     Jacek Anaszewski <jacek.anaszewski@...il.com>,
        Pavel Machek <pavel@....cz>, Dan Murphy <dmurphy@...com>
Cc:     linux-leds@...r.kernel.org, linux-kernel@...r.kernel.org,
        Tobias Schramm <t.schramm@...jaro.org>
Subject: [RFC PATCH 0/1] Add generic inverted led triggers

This patch adds generic inverted LED triggers. With this patch applied
any trigger can be used with inverted brightness levels by appending
"-inverted" to the name of a trigger.

This is can be useful for devices that do not have dedicated LEDs for e.g.
disk activity indication. With this patch applied the power led can be set
 to default-state = on and trigger = disk-activity-inverted. Then the led
will be on by default, indicating the power state of the device but it
will turn off briefly whenever there is disk activity.

I think dual-use of LEDs might come in handy for quite a few devices since
a lot of embedded boards and upcoming ARM based notebooks do only have one
or two LEDs.

Best regards,

Tobias

Tobias Schramm (1):
  leds: add generic inverted led trigger support

 drivers/leds/led-triggers.c | 148 +++++++++++++++++++++++++++---------
 include/linux/leds.h        |   1 +
 2 files changed, 111 insertions(+), 38 deletions(-)

-- 
2.24.1