Hi! > +++ b/Documentation/ABI/testing/sysfs-class-led-trigger-tty > @@ -0,0 +1,6 @@ > +What: /sys/class/leds/<led>/ttyname > +Date: Jul 2020 > +KernelVersion: 5.8 > +Contact: linux-l...@vger.kernel.org > +Description: > + Specifies the tty device name of the triggering tty > diff --git a/drivers/leds/trigger/Kconfig b/drivers/leds/trigger/Kconfig > index ce9429ca6dde..40ff08c93f56 100644 > --- a/drivers/leds/trigger/Kconfig > +++ b/drivers/leds/trigger/Kconfig > @@ -144,4 +144,11 @@ config LEDS_TRIGGER_AUDIO > the audio mute and mic-mute changes. > If unsure, say N > > +config LEDS_TRIGGER_TTY > + tristate "LED Trigger for TTY devices" > + depends on TTY > + help > + This allows LEDs to be controlled by activity on ttys which includes > + serial devices like /dev/ttyS0.
"This driver can be built as a module, resulting module will be
named.. If unsure, say N."
> +++ b/drivers/leds/trigger/ledtrig-tty.c
> @@ -0,0 +1,192 @@
> +// SPDX-License-Identifier: GPL-2.0
2.0+ is preffered.
> +
> + while (firstrun ||
> + icount.rx != trigger_data->rx ||
> + icount.tx != trigger_data->tx) {
> +
> + led_set_brightness(trigger_data->led_cdev, LED_ON);
> +
> + msleep(100);
> +
> + led_set_brightness(trigger_data->led_cdev, LED_OFF);
Is this good idea inside workqueue?
> + trigger_data->rx = icount.rx;
> + trigger_data->tx = icount.tx;
> + firstrun = false;
> +
> + ret = tty_get_icount(trigger_data->tty, &icount);
> + if (ret)
> + return;
Unbalanced locking.
> + }
> +
> +out:
> + mutex_unlock(&trigger_data->mutex);
> + schedule_delayed_work(&trigger_data->dwork, msecs_to_jiffies(100));
> +}
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