Based on kernel version 4.16.1. Page generated on 2018-04-09 11:53 EST.
1 The leds-blinkm driver supports the devices of the BlinkM family. 2 3 They are RGB-LED modules driven by a (AT)tiny microcontroller and 4 communicate through I2C. The default address of these modules is 5 0x09 but this can be changed through a command. By this you could 6 dasy-chain up to 127 BlinkMs on an I2C bus. 7 8 The device accepts RGB and HSB color values through separate commands. 9 Also you can store blinking sequences as "scripts" in 10 the controller and run them. Also fading is an option. 11 12 The interface this driver provides is 2-fold: 13 14 a) LED class interface for use with triggers 15 ############################################ 16 17 The registration follows the scheme: 18 blinkm-<i2c-bus-nr>-<i2c-device-nr>-<color> 19 20 $ ls -h /sys/class/leds/blinkm-6-* 21 /sys/class/leds/blinkm-6-9-blue: 22 brightness device max_brightness power subsystem trigger uevent 23 24 /sys/class/leds/blinkm-6-9-green: 25 brightness device max_brightness power subsystem trigger uevent 26 27 /sys/class/leds/blinkm-6-9-red: 28 brightness device max_brightness power subsystem trigger uevent 29 30 (same is /sys/bus/i2c/devices/6-0009/leds) 31 32 We can control the colors separated into red, green and blue and 33 assign triggers on each color. 34 35 E.g.: 36 37 $ cat blinkm-6-9-blue/brightness 38 05 39 40 $ echo 200 > blinkm-6-9-blue/brightness 41 $ 42 43 $ modprobe ledtrig-heartbeat 44 $ echo heartbeat > blinkm-6-9-green/trigger 45 $ 46 47 48 b) Sysfs group to control rgb, fade, hsb, scripts ... 49 ##################################################### 50 51 This extended interface is available as folder blinkm 52 in the sysfs folder of the I2C device. 53 E.g. below /sys/bus/i2c/devices/6-0009/blinkm 54 55 $ ls -h /sys/bus/i2c/devices/6-0009/blinkm/ 56 blue green red test 57 58 Currently supported is just setting red, green, blue 59 and a test sequence. 60 61 E.g.: 62 63 $ cat * 64 00 65 00 66 00 67 #Write into test to start test sequence!# 68 69 $ echo 1 > test 70 $ 71 72 $ echo 255 > red 73 $ 74 75 76 77 as of 6/2012 78 79 dl9pf <at> gmx <dot> de