Commit | Line | Data |
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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 |