mirrors
/
linux-stable
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
1
0
Fork 0
Code Issues Releases Wiki Activity

leds: trigger: tty: Do not use LED_ON/OFF constants, use led_blink_set_oneshot instead 

[ Upstream commit 730094577e ]

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: fd4a641ac8 ("leds: trigger: implement a tty trigger")
Signed-off-by: Marek Behún <kabel@kernel.org>
Link: https://lore.kernel.org/r/20230802090753.13611-1-kabel@kernel.org
Signed-off-by: Lee Jones <lee@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Marek Behún 2023-08-02 11:07:53 +02:00 committed by Greg Kroah-Hartman
parent e2a579c5a9
commit 0301718d3a
1 changed files with 8 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
drivers/leds/trigger/ledtrig-tty.c
View File

@ -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[] = {