1 What: /sys/class/leds/<led>/brightne
2 Date: March 2006
3 KernelVersion: 2.6.17
4 Contact: Richard Purdie <rpurdie@rpsys.n
5 Description:
6 Set the brightness of the LED.
7
8 Most LEDs don't have hardware
9 just be turned on for non-zero
10
11 .. Note::
12
13 For multicolor LEDs, writing
14 LEDs within the group to a c
15 each color LED intensity is
16
17 The percentage is calculated
18 the equation below::
19
20 led_brightness = brightnes
21
22 For additional details pleas
23 Documentation/leds/leds-clas
24
25 The value is between 0 and
26 /sys/class/leds/<led>/max_brig
27
28 Writing 0 to this file clears
29
30 Writing non-zero to this file
31 top brightness trigger is goin
32
33
34
35 What: /sys/class/leds/<led>/max_brig
36 Date: March 2006
37 KernelVersion: 2.6.17
38 Contact: Richard Purdie <rpurdie@rpsys.n
39 Description:
40 Maximum brightness level for t
41
42 If the LED does not support di
43 should be 1.
44
45 What: /sys/class/leds/<led>/brightne
46 Date: January 2017
47 KernelVersion: 4.11
48 Description:
49 Last hardware set brightness l
50 may be changed autonomously by
51 where this happens and the dri
52 this file.
53
54 This file supports poll() to d
55 the brightness.
56
57 Reading this file will return
58 by the hardware, this may be d
59 brightness. Reading this file
60 event has happened will return
61
62 What: /sys/class/leds/<led>/trigger
63 Date: March 2006
64 KernelVersion: 2.6.17
65 Contact: Richard Purdie <rpurdie@rpsys.n
66 Description:
67 Set the trigger for this LED.
68 of LED events.
69
70 You can change triggers in a s
71 scheduler is chosen. Trigger s
72 /sys/class/leds/<led> once a g
73 their documentation see `sysfs
74
75 What: /sys/class/leds/<led>/inverted
76 Date: January 2011
77 KernelVersion: 2.6.38
78 Contact: Richard Purdie <rpurdie@rpsys.n
79 Description:
80 Invert the LED on/off state. T
81 gpio and backlight triggers. I
82 it is useful when driving a LE
83 a device in a standby like sta
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