projects / mirror_ubuntu-bionic-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| b54cf35a JSM |
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 |