1 What: /sys/class/leds/<led>/brightne 1 What: /sys/class/leds/<led>/brightness
2 Date: March 2006 2 Date: March 2006
3 KernelVersion: 2.6.17 3 KernelVersion: 2.6.17
4 Contact: Richard Purdie <rpurdie@rpsys.n 4 Contact: Richard Purdie <rpurdie@rpsys.net>
5 Description: 5 Description:
6 Set the brightness of the LED. !! 6 Set the brightness of the LED. Most LEDs don't
7 !! 7 have hardware brightness support so will just be turned on for
8 Most LEDs don't have hardware !! 8 non-zero brightness settings. The value is between 0 and
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 9 /sys/class/leds/<led>/max_brightness.
27 10
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 11 What: /sys/class/leds/<led>/max_brightness
36 Date: March 2006 12 Date: March 2006
37 KernelVersion: 2.6.17 13 KernelVersion: 2.6.17
38 Contact: Richard Purdie <rpurdie@rpsys.n 14 Contact: Richard Purdie <rpurdie@rpsys.net>
39 Description: 15 Description:
40 Maximum brightness level for t !! 16 Maximum brightness level for this led, default is 255 (LED_FULL).
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 17
62 What: /sys/class/leds/<led>/trigger 18 What: /sys/class/leds/<led>/trigger
63 Date: March 2006 19 Date: March 2006
64 KernelVersion: 2.6.17 20 KernelVersion: 2.6.17
65 Contact: Richard Purdie <rpurdie@rpsys.n 21 Contact: Richard Purdie <rpurdie@rpsys.net>
66 Description: 22 Description:
67 Set the trigger for this LED. 23 Set the trigger for this LED. A trigger is a kernel based source
68 of LED events. !! 24 of led events.
69 <<
70 You can change triggers in a s 25 You can change triggers in a similar manner to the way an IO
71 scheduler is chosen. Trigger s 26 scheduler is chosen. Trigger specific parameters can appear in
72 /sys/class/leds/<led> once a g 27 /sys/class/leds/<led> once a given trigger is selected. For
73 their documentation see `sysfs !! 28 their documentation see sysfs-class-led-trigger-*.
74 29
75 What: /sys/class/leds/<led>/inverted 30 What: /sys/class/leds/<led>/inverted
76 Date: January 2011 31 Date: January 2011
77 KernelVersion: 2.6.38 32 KernelVersion: 2.6.38
78 Contact: Richard Purdie <rpurdie@rpsys.n 33 Contact: Richard Purdie <rpurdie@rpsys.net>
79 Description: 34 Description:
80 Invert the LED on/off state. T 35 Invert the LED on/off state. This parameter is specific to
81 gpio and backlight triggers. I 36 gpio and backlight triggers. In case of the backlight trigger,
82 it is useful when driving a LE 37 it is useful when driving a LED which is intended to indicate
83 a device in a standby like sta 38 a device in a standby like state.
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