1================== 2Leds BlinkM driver 3================== 4 5The leds-blinkm driver supports the devices of the BlinkM family. 6 7They are RGB-LED modules driven by a (AT)tiny microcontroller and 8communicate through I2C. The default address of these modules is 90x09 but this can be changed through a command. By this you could 10dasy-chain up to 127 BlinkMs on an I2C bus. 11 12The device accepts RGB and HSB color values through separate commands. 13Also you can store blinking sequences as "scripts" in 14the controller and run them. Also fading is an option. 15 16The interface this driver provides is 2-fold: 17 18a) LED class interface for use with triggers 19############################################ 20 21The registration follows the scheme:: 22 23 blinkm-<i2c-bus-nr>-<i2c-device-nr>-<color> 24 25 $ ls -h /sys/class/leds/blinkm-6-* 26 /sys/class/leds/blinkm-6-9-blue: 27 brightness device max_brightness power subsystem trigger uevent 28 29 /sys/class/leds/blinkm-6-9-green: 30 brightness device max_brightness power subsystem trigger uevent 31 32 /sys/class/leds/blinkm-6-9-red: 33 brightness device max_brightness power subsystem trigger uevent 34 35(same is /sys/bus/i2c/devices/6-0009/leds) 36 37We can control the colors separated into red, green and blue and 38assign triggers on each color. 39 40E.g.:: 41 42 $ cat blinkm-6-9-blue/brightness 43 05 44 45 $ echo 200 > blinkm-6-9-blue/brightness 46 $ 47 48 $ modprobe ledtrig-heartbeat 49 $ echo heartbeat > blinkm-6-9-green/trigger 50 $ 51 52 53b) Sysfs group to control rgb, fade, hsb, scripts ... 54##################################################### 55 56This extended interface is available as folder blinkm 57in the sysfs folder of the I2C device. 58E.g. below /sys/bus/i2c/devices/6-0009/blinkm 59 60 $ ls -h /sys/bus/i2c/devices/6-0009/blinkm/ 61 blue green red test 62 63Currently supported is just setting red, green, blue 64and a test sequence. 65 66E.g.:: 67 68 $ cat * 69 00 70 00 71 00 72 #Write into test to start test sequence!# 73 74 $ echo 1 > test 75 $ 76 77 $ echo 255 > red 78 $ 79 80 81 82as of 6/2012 83 84dl9pf <at> gmx <dot> de 85