1 ====================
2 One-shot LED Trigger
3 ====================
4
5 This is a LED trigger useful for signaling the
6 no clear trap points to put standard led-on an
7 trigger, the application needs only to signal
8 happened, then the trigger turns the LED on an
9 specified amount of time.
10
11 This trigger is meant to be usable both for sp
12 first case, the trigger produces a clear singl
13 event, while in the latter it keeps blinking a
14 that the events are arriving continuously.
15
16 A one-shot LED only stays in a constant state
17 additional "invert" property specifies if the
18 on (inverted) when not rearmed.
19
20 The trigger can be activated from user space o
21 below::
22
23 echo oneshot > trigger
24
25 This adds sysfs attributes to the LED that are
26 Documentation/ABI/testing/sysfs-class-led-trig
27
28 Example use-case: network devices, initializat
29
30 echo oneshot > trigger # set trigger for thi
31 echo 33 > delay_on # blink at 1 / (33 +
32 echo 33 > delay_off
33
34 interface goes up::
35
36 echo 1 > invert # set led as normally-on, tu
37
38 packet received/transmitted::
39
40 echo 1 > shot # led starts blinking, ignored
41
42 interface goes down::
43
44 echo 0 > invert # set led as normally-off, t
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