1What: /sys/class/chromeos/<ec-device-name>/lightbar/brightness 2Date: August 2015 3KernelVersion: 4.2 4Description: 5 Writing to this file adjusts the overall brightness of 6 the lightbar, separate from any color intensity. The 7 valid range is 0 (off) to 255 (maximum brightness). 8 9What: /sys/class/chromeos/<ec-device-name>/lightbar/interval_msec 10Date: August 2015 11KernelVersion: 4.2 12Description: 13 The lightbar is controlled by an embedded controller (EC), 14 which also manages the keyboard, battery charging, fans, 15 and other system hardware. To prevent unprivileged users 16 from interfering with the other EC functions, the rate at 17 which the lightbar control files can be read or written is 18 limited. 19 20 Reading this file will return the number of milliseconds 21 that must elapse between accessing any of the lightbar 22 functions through this interface. Going faster will simply 23 block until the necessary interval has lapsed. The interval 24 applies uniformly to all accesses of any kind by any user. 25 26What: /sys/class/chromeos/<ec-device-name>/lightbar/led_rgb 27Date: August 2015 28KernelVersion: 4.2 29Description: 30 This allows you to control each LED segment. If the 31 lightbar is already running one of the automatic 32 sequences, you probably won’t see anything change because 33 your color setting will be almost immediately replaced. 34 To get useful results, you should stop the lightbar 35 sequence first. 36 37 The values written to this file are sets of four integers, 38 indicating LED, RED, GREEN, BLUE. The LED number is 0 to 3 39 to select a single segment, or 4 to set all four segments 40 to the same value at once. The RED, GREEN, and BLUE 41 numbers should be in the range 0 (off) to 255 (maximum). 42 You can update more than one segment at a time by writing 43 more than one set of four integers. 44 45What: /sys/class/chromeos/<ec-device-name>/lightbar/program 46Date: August 2015 47KernelVersion: 4.2 48Description: 49 This allows you to upload and run custom lightbar sequences. 50 51What: /sys/class/chromeos/<ec-device-name>/lightbar/sequence 52Date: August 2015 53KernelVersion: 4.2 54Description: 55 The Pixel lightbar has a number of built-in sequences 56 that it displays under various conditions, such as at 57 power on, shut down, or while running. Reading from this 58 file displays the current sequence that the lightbar is 59 displaying. Writing to this file allows you to change the 60 sequence. 61 62What: /sys/class/chromeos/<ec-device-name>/lightbar/userspace_control 63Date: August 2015 64KernelVersion: 4.2 65Description: 66 This allows you to take the control of the lightbar. This 67 prevents the kernel from going through its normal 68 sequences. 69 70What: /sys/class/chromeos/<ec-device-name>/lightbar/version 71Date: August 2015 72KernelVersion: 4.2 73Description: 74 Show the information about the lightbar version. 75