linux-dev/Documentation/ABI/testing/sysfs-class-led-trigger-tty, branch master Linux kernel development work - see feature branches https://git.zx2c4.com/linux-dev/atom/Documentation/ABI/testing/sysfs-class-led-trigger-tty?h=master 2021-01-15T09:22:26Z leds: trigger: implement a tty trigger 2021-01-15T09:22:26Z Uwe Kleine-König u.kleine-koenig@pengutronix.de 2021-01-13T17:30:18Z urn:sha1:fd4a641ac88fbbaf8b90e00823397597a287cfcd Usage is as follows: myled=ledname tty=ttyS0 echo tty > /sys/class/leds/$myled/trigger echo $tty > /sys/class/leds/$myled/ttyname . When this new trigger is active it periodically checks the tty's statistics and when it changed since the last check the led is flashed once. Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Link: https://lore.kernel.org/r/20210113173018.bq2fkea2o3yp6rf6@pengutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>