1 ================== 2 Leds BlinkM driver 3 ================== 4 5 The leds-blinkm driver supports the devices of the BlinkM family. 6 7 They are RGB-LED modules driven by a (AT)tiny microcontroller and 8 communicate through I2C. The default address of these modules is 9 0x09 but this can be changed through a command. By this you could 10 daisy-chain up to 127 BlinkMs on an I2C bus. 11 12 The device accepts RGB and HSB color values through separate commands. 13 Also you can store blinking sequences as "scripts" in 14 the controller and run them. Also fading is an option. 15 16 The interface this driver provides is 2-fold: 17 18 a) LED class interface for use with triggers 19 ############################################ 20 21 The 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 37 We can control the colors separated into red, green and blue and 38 assign triggers on each color. 39 40 E.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 53 b) Sysfs group to control rgb, fade, hsb, scripts ... 54 ##################################################### 55 56 This extended interface is available as folder blinkm 57 in the sysfs folder of the I2C device. 58 E.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 63 Currently supported is just setting red, green, blue 64 and a test sequence. 65 66 E.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 82 as of 6/2012 83 84 dl9pf <at> gmx <dot> de
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.