mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-27 22:53:55 +08:00
b54cf35a7f
Add driver for BlinkM device to drivers/leds/. Add entry to MAINTAINERS file. Add documentation in Documentation/leds/. A BlinkM is a RGB LED controlled through I2C. This driver implements an interface to the LED framework and another sysfs group to access the internal options of the BlinkM. rev6: Use module_i2c_driver(). rev5: Removed own workqueue in favor of events wq. rev4: Fixed comments by Bryan Wu. rev3: Fixed issues found by Jonathan Neuschäfer. (bryan.wu@canonical.com: remove 2 trailing whitespace) Signed-off-by: Jan-Simon Möller <jansimon.moeller@gmx.de> Signed-off-by: Bryan Wu <bryan.wu@canonical.com>
81 lines
1.9 KiB
Plaintext
81 lines
1.9 KiB
Plaintext
The leds-blinkm driver supports the devices of the BlinkM family.
|
|
|
|
They are RGB-LED modules driven by a (AT)tiny microcontroller and
|
|
communicate through I2C. The default address of these modules is
|
|
0x09 but this can be changed through a command. By this you could
|
|
dasy-chain up to 127 BlinkMs on an I2C bus.
|
|
|
|
The device accepts RGB and HSB color values through separate commands.
|
|
Also you can store blinking sequences as "scripts" in
|
|
the controller and run them. Also fading is an option.
|
|
|
|
The interface this driver provides is 2-fold:
|
|
|
|
a) LED class interface for use with triggers
|
|
############################################
|
|
|
|
The registration follows the scheme:
|
|
blinkm-<i2c-bus-nr>-<i2c-device-nr>-<color>
|
|
|
|
$ ls -h /sys/class/leds/blinkm-6-*
|
|
/sys/class/leds/blinkm-6-9-blue:
|
|
brightness device max_brightness power subsystem trigger uevent
|
|
|
|
/sys/class/leds/blinkm-6-9-green:
|
|
brightness device max_brightness power subsystem trigger uevent
|
|
|
|
/sys/class/leds/blinkm-6-9-red:
|
|
brightness device max_brightness power subsystem trigger uevent
|
|
|
|
(same is /sys/bus/i2c/devices/6-0009/leds)
|
|
|
|
We can control the colors separated into red, green and blue and
|
|
assign triggers on each color.
|
|
|
|
E.g.:
|
|
|
|
$ cat blinkm-6-9-blue/brightness
|
|
05
|
|
|
|
$ echo 200 > blinkm-6-9-blue/brightness
|
|
$
|
|
|
|
$ modprobe ledtrig-heartbeat
|
|
$ echo heartbeat > blinkm-6-9-green/trigger
|
|
$
|
|
|
|
|
|
b) Sysfs group to control rgb, fade, hsb, scripts ...
|
|
#####################################################
|
|
|
|
This extended interface is available as folder blinkm
|
|
in the sysfs folder of the I2C device.
|
|
E.g. below /sys/bus/i2c/devices/6-0009/blinkm
|
|
|
|
$ ls -h /sys/bus/i2c/devices/6-0009/blinkm/
|
|
blue green red test
|
|
|
|
Currently supported is just setting red, green, blue
|
|
and a test sequence.
|
|
|
|
E.g.:
|
|
|
|
$ cat *
|
|
00
|
|
00
|
|
00
|
|
#Write into test to start test sequence!#
|
|
|
|
$ echo 1 > test
|
|
$
|
|
|
|
$ echo 255 > red
|
|
$
|
|
|
|
|
|
|
|
as of 6/2012
|
|
|
|
dl9pf <at> gmx <dot> de
|
|
|