This is a note to let you know that I've just added the patch titled
leds: trigger: tty: Do not use LED_ON/OFF constants, use led_blink_set_oneshot instead
to the 6.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
leds-trigger-tty-do-not-use-led_on-off-constants-use.patch
and it can be found in the queue-6.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit b805cd6c738ed6b1ccfd8a1c0d46cd4e54a685ae
Author: Marek Behún <kabel@xxxxxxxxxx>
Date: Wed Aug 2 11:07:53 2023 +0200
leds: trigger: tty: Do not use LED_ON/OFF constants, use led_blink_set_oneshot instead
[ Upstream commit 730094577e0c37e1bc40be37cbd41f71b0a8a2a4 ]
The tty LED trigger uses the obsolete LED_ON & LED_OFF constants when
setting LED brightness. This is bad because the LED_ON constant is equal
to 1, and so when activating the tty LED trigger on a LED class device
with max_brightness greater than 1, the LED is dimmer than it can be
(when max_brightness is 255, the LED is very dimm indeed; some devices
translate 1/255 to 0, so the LED is OFF all the time).
Instead of directly setting brightness to a specific value, use the
led_blink_set_oneshot() function from LED core to configure the blink.
This function takes the current configured brightness as blink
brightness if not zero, and max brightness otherwise.
This also changes the behavior of the TTY LED trigger. Previously if
rx/tx stats kept changing, the LED was ON all the time they kept
changing. With this patch the LED will blink on TTY activity.
Fixes: fd4a641ac88f ("leds: trigger: implement a tty trigger")
Signed-off-by: Marek Behún <kabel@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20230802090753.13611-1-kabel@xxxxxxxxxx
Signed-off-by: Lee Jones <lee@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/leds/trigger/ledtrig-tty.c b/drivers/leds/trigger/ledtrig-tty.c
index f62db7e520b52..8ae0d2d284aff 100644
--- a/drivers/leds/trigger/ledtrig-tty.c
+++ b/drivers/leds/trigger/ledtrig-tty.c
@@ -7,6 +7,8 @@
#include <linux/tty.h>
#include <uapi/linux/serial.h>
+#define LEDTRIG_TTY_INTERVAL 50
+
struct ledtrig_tty_data {
struct led_classdev *led_cdev;
struct delayed_work dwork;
@@ -122,17 +124,19 @@ static void ledtrig_tty_work(struct work_struct *work)
if (icount.rx != trigger_data->rx ||
icount.tx != trigger_data->tx) {
- led_set_brightness_sync(trigger_data->led_cdev, LED_ON);
+ unsigned long interval = LEDTRIG_TTY_INTERVAL;
+
+ led_blink_set_oneshot(trigger_data->led_cdev, &interval,
+ &interval, 0);
trigger_data->rx = icount.rx;
trigger_data->tx = icount.tx;
- } else {
- led_set_brightness_sync(trigger_data->led_cdev, LED_OFF);
}
out:
mutex_unlock(&trigger_data->mutex);
- schedule_delayed_work(&trigger_data->dwork, msecs_to_jiffies(100));
+ schedule_delayed_work(&trigger_data->dwork,
+ msecs_to_jiffies(LEDTRIG_TTY_INTERVAL * 2));
}
static struct attribute *ledtrig_tty_attrs[] = {
