| Jan-Simon Möller | b54cf35 | 2012-07-20 16:49:06 +0800 | [diff] [blame] | 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 |
| 80 | |