| | 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 | |
projects / GitHub / LineageOS / android_kernel_motorola_exynos9610.git / blame_incremental