1 What: /sys/class/chromeos/<ec-device 1 What: /sys/class/chromeos/<ec-device-name>/lightbar/brightness
2 Date: August 2015 2 Date: August 2015
3 KernelVersion: 4.2 3 KernelVersion: 4.2
4 Description: 4 Description:
5 Writing to this file adjusts t 5 Writing to this file adjusts the overall brightness of
6 the lightbar, separate from an 6 the lightbar, separate from any color intensity. The
7 valid range is 0 (off) to 255 7 valid range is 0 (off) to 255 (maximum brightness).
8 8
9 What: /sys/class/chromeos/<ec-device 9 What: /sys/class/chromeos/<ec-device-name>/lightbar/interval_msec
10 Date: August 2015 10 Date: August 2015
11 KernelVersion: 4.2 11 KernelVersion: 4.2
12 Description: 12 Description:
13 The lightbar is controlled by 13 The lightbar is controlled by an embedded controller (EC),
14 which also manages the keyboar 14 which also manages the keyboard, battery charging, fans,
15 and other system hardware. To 15 and other system hardware. To prevent unprivileged users
16 from interfering with the othe 16 from interfering with the other EC functions, the rate at
17 which the lightbar control fil 17 which the lightbar control files can be read or written is
18 limited. 18 limited.
19 19
20 Reading this file will return 20 Reading this file will return the number of milliseconds
21 that must elapse between acces 21 that must elapse between accessing any of the lightbar
22 functions through this interfa 22 functions through this interface. Going faster will simply
23 block until the necessary inte 23 block until the necessary interval has lapsed. The interval
24 applies uniformly to all acces 24 applies uniformly to all accesses of any kind by any user.
25 25
26 What: /sys/class/chromeos/<ec-device 26 What: /sys/class/chromeos/<ec-device-name>/lightbar/led_rgb
27 Date: August 2015 27 Date: August 2015
28 KernelVersion: 4.2 28 KernelVersion: 4.2
29 Description: 29 Description:
30 This allows you to control eac 30 This allows you to control each LED segment. If the
31 lightbar is already running on 31 lightbar is already running one of the automatic
32 sequences, you probably won’ 32 sequences, you probably won’t see anything change because
33 your color setting will be alm 33 your color setting will be almost immediately replaced.
34 To get useful results, you sho 34 To get useful results, you should stop the lightbar
35 sequence first. 35 sequence first.
36 36
37 The values written to this fil 37 The values written to this file are sets of four integers,
38 indicating LED, RED, GREEN, BL 38 indicating LED, RED, GREEN, BLUE. The LED number is 0 to 3
39 to select a single segment, or 39 to select a single segment, or 4 to set all four segments
40 to the same value at once. The 40 to the same value at once. The RED, GREEN, and BLUE
41 numbers should be in the range 41 numbers should be in the range 0 (off) to 255 (maximum).
42 You can update more than one s 42 You can update more than one segment at a time by writing
43 more than one set of four inte 43 more than one set of four integers.
44 44
45 What: /sys/class/chromeos/<ec-device 45 What: /sys/class/chromeos/<ec-device-name>/lightbar/program
46 Date: August 2015 46 Date: August 2015
47 KernelVersion: 4.2 47 KernelVersion: 4.2
48 Description: 48 Description:
49 This allows you to upload and 49 This allows you to upload and run custom lightbar sequences.
50 50
51 What: /sys/class/chromeos/<ec-device 51 What: /sys/class/chromeos/<ec-device-name>/lightbar/sequence
52 Date: August 2015 52 Date: August 2015
53 KernelVersion: 4.2 53 KernelVersion: 4.2
54 Description: 54 Description:
55 The Pixel lightbar has a numbe 55 The Pixel lightbar has a number of built-in sequences
56 that it displays under various 56 that it displays under various conditions, such as at
57 power on, shut down, or while 57 power on, shut down, or while running. Reading from this
58 file displays the current sequ 58 file displays the current sequence that the lightbar is
59 displaying. Writing to this fi 59 displaying. Writing to this file allows you to change the
60 sequence. 60 sequence.
61 61
62 What: /sys/class/chromeos/<ec-device 62 What: /sys/class/chromeos/<ec-device-name>/lightbar/userspace_control
63 Date: August 2015 63 Date: August 2015
64 KernelVersion: 4.2 64 KernelVersion: 4.2
65 Description: 65 Description:
66 This allows you to take the co 66 This allows you to take the control of the lightbar. This
67 prevents the kernel from going 67 prevents the kernel from going through its normal
68 sequences. 68 sequences.
69 69
70 What: /sys/class/chromeos/<ec-device 70 What: /sys/class/chromeos/<ec-device-name>/lightbar/version
71 Date: August 2015 71 Date: August 2015
72 KernelVersion: 4.2 72 KernelVersion: 4.2
73 Description: 73 Description:
74 Show the information about the 74 Show the information about the lightbar version.
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