[Moto E Android Development] matmutant:
Playing With Notification LED

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Original source (for MotoG) <<< make sure you read the blog article before commenting ....

dedicated Blog article for MotoE

It's always cool to know at a glance that your device is charging without the need of lighting the screen, here is how:

Requirements :

Moto E (tested on XT1022)

Rooted

SU rights granted

adb if you want to monitor all this from a computer

#include <std_disclaimer.h>
/*
* Your warranty is now void.
*
* I am not responsible for bricked devices, dead SD cards, BURNT LEDs,
* thermonuclear war, or you getting fired because the alarm app failed.
* YOU are choosing to make these modifications, and if
* you point the finger at me for messing up your device, I will laugh at you.
*/

in /sys/class/leds/charging/trigger we have these triggers available :

[none] bkl-trigger usb-online mmc0 mmc1 battery-charging-or-full battery-charging battery-full battery-charging-blink-full-solid bms-online

easy to change them using :

echo battery-charging >/sys/class/leds/charging/trigger

needs to set any value !=0 for brightness (LED is either ON or OFF on MotoE):

echo 1 >/sys/class/leds/charging/trigger

Moto E (is quite different than Moto G MotoG has two LEDs too, they are simply impossible to see):

If you pay attention, you can se that Moto E has Two little white LEDs soldered under the LED hole, the first one (left) is ruled by /sys/class/leds/charging and the second one (less bright, ont the right) is ruled by the /sys/class/leds/white.

/sys/class/leds/white/trigger, and /sys/class/leds/white/brightness configure the right LED and these settings are overridden has soon as a notification comes.

/sys/class/leds/charging/trigger and /sys/class/charging/brightness configure the left LED (the brighter one) and these settings are not overridden by notifications AND both can work toghether:

You can see the left one kept ON while charging (using battery-charging trigger) and the right one Blinking with an incoming notification.

It is time for the community to help, and we will find out a way to correctly dim the LEDs if possible.

For now, the best way is to set left LED (/sys/class/leds/charging/) for charging using dedicated trigger and keeping the right one to none and get both working together this way.

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[YOUTUBE]hYmxhQfwPT8[/YOUTUBE]
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Set at boot

:

WARNING : if you fail this, you may screw up your device ... (keep a backup somewhere)

Create a blank file and name it like 99charging_LED-blink

paste the following in that file :

#!/system/bin/sh
# enabling charging LED blinking while charging
echo "battery-charging-blink-full-solid" >/sys/class/leds/charging/trigger
echo "1" >/sys/class/leds/charging/brightness

mount /etc/init.d as RW

Paste 99charging_LED-blink there

set permissions as -RWXR-XR-X

Open terminal emulator, and type :

su
sh /etc/init.d/99charging_LED-blink

Plug it to charger, it should start blinking ... if not, make sure everything is correctly set

Reboot

Enjoy!

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For whose who asked, here is the proof of the 2 LEDs and their White-color :

http://xdaforums.com/showpost.php?p=57039807&postcount=7

Feel free to test further and report your discoveries!

The above has been tested on stock rooted ROM, and reported to work on CM11-m12, both on XT1022.

Here is the LED related Thread for MotoG

XDA:DevDB Information

[LED][DEV] Moto E LED Custom Controls, Tool/Utility for the Moto E

Contributors

matmutant

Version Information

Status: Testing

Created 2014-11-24

Last Updated 2014-12-15