[KERNEL PATCH] Force AC (fast) Charging

chad0989 · Apr 11, 2012

This is for kernel devs only. The patch itself is useless to those who do not/can not compile their own kernel.

This was a pretty big hit on some other devices so I figured I'd give it a shot for you guys. This allows one to force AC charging for any charger that is detected as USB (e.g. many car chargers) and pull the full current the charger can support. It also provides additional security when connecting to public charging stations because by forcing AC charging, USB/adb data transfers are disabled, protecting your data.

It is essentially a software version of the modified charge only usb cables.

Fast charge can be toggled by issuing:

echo 1 > /sys/kernel/fast_charge/force_fast_charge

and off:

echo 0 > /sys/kernel/fast_charge/force_fast_charge

In addition I have created a toggle fast charge widget that may be used to toggle fast charge on and off right from your home screen:

https://play.google.com/store/apps/details?id=com.incredicontrol.fastchargewidget

I have also implemented a toggle in IncrediControl (free) that will allow you to turn it on and off.

https://play.google.com/store/apps/details?id=com.incredicontrol

For the widget (or any fast charge toggle) to work, you MUST be running a kernel that has this patch implemented.

As a good gesture to support a fellow dev, I ask that if you implement the patch into your kernel, please link to my widget as one means to toggle it. You are of course free to provide other ways to toggle it as well if you so desire.

Kernel devs, if you would like to test the widget yourself to confirm its working, and for convenience of testing, please contact me and I will provide you with a copy. You must show that you are a kernel dev though (i.e. link me to your kernel post so I can match your username).

http://www.incredikernel.com/wp-con.../download.php?id=vivo_force_fast_charge.patch

veitograf · Apr 12, 2012

i'm not a dev, but im very looking forward to seeing this in future kernel updates.

there are still many car chargers out there that could do 1ah charging but are recognized as standard usb chargers. with that you cant even use navigation without loosing battery over some time.

btw your apps are awesome!

chad0989 · Apr 12, 2012

veitograf said:
i'm not a dev, but im very looking forward to seeing this in future kernel updates.

there are still many car chargers out there that could do 1ah charging but are recognized as standard usb chargers. with that you cant even use navigation without loosing battery over some time.

btw your apps are awesome!

What kernel do you use? I'll patch it and build a copy for you real quick.

Edit: I looked at your signature and saw virtuous quattro. Here is the kernel built from the github from that ROM:
http://chad0989.dyndns.org/mirror/virtuous-quattro-vivo-fastcharge.zip

Enjoy.

fridgie · Apr 13, 2012

I'm sure interested in this, am sick of my phone dying when connected to car charger. Hopefully someone can write this for affinity as I just don't have the skills.

Amazes me how you guys can do this stuff

veitograf · Apr 13, 2012

chad0989 said:
What kernel do you use? I'll patch it and build a copy for you real quick.

Edit: I looked at your signature and saw virtuous quattro. Here is the kernel built from the github from that ROM:
http://chad0989.dyndns.org/mirror/virtuous-quattro-vivo-fastcharge.zip

Enjoy.

thanks man, appreciate that!

edit, does this work with sensation too? i got one lying around.

chad0989 · Apr 13, 2012

veitograf said:
thanks man, appreciate that!

edit, does this work with sensation too? i got one lying around.

Not yet, but if there is interest I can make a patch for the sensation also.

Riyal · Apr 23, 2012

Hi chad! Would really like to port your patch to the Sony's Xperia Devices but I'm stuck at the moment on

msm72k_udc.c

Could I ask some help?

We don't have charger_detect() function so I'm lost on where to apply some of the patches on that file. If you want you could browse the file here

http://108.166.90.15/.rom/XPR/kernel/drivers/usb/gadget/msm72k_udc.c

Or browse the entire kernel for Xperia 2011 devices here

http://108.166.90.15/.rom/XPR/kernel/

and tarball here if you want

http://108.166.90.15/.rom/XPR.tar

itandy · Apr 24, 2012

Anyone knows if any existing IncS kernels support Force AC? I really like to use it to boost the charge time.

@chad0989, if possible, can you also mod the X-ICS AOSP V3 kernel for us? The source link is here. Many thanks!

vieose · Apr 24, 2012

chad0989 said:
This is for kernel devs only. The patch itself is useless to those who do not/can not compile their own kernel.

This was a pretty big hit on some other devices so I figured I'd give it a shot for you guys. This allows one to force AC charging for any charger that is detected as USB (e.g. many car chargers) and pull the full current the charger can support. It also provides additional security when connecting to public charging stations because by forcing AC charging, USB/adb data transfers are disabled, protecting your data.

It is essentially a software version of the modified charge only usb cables.

Fast charge can be toggled by issuing:

echo 1 > /sys/kernel/fast_charge/force_fast_charge

and off:

echo 0 > /sys/kernel/fast_charge/force_fast_charge

In addition I have created a toggle fast charge widget that may be used to toggle fast charge on and off right from your home screen:

https://play.google.com/store/apps/details?id=com.incredicontrol.fastchargewidget

I have also implemented a toggle in IncrediControl (free) that will allow you to turn it on and off.

https://play.google.com/store/apps/details?id=com.incredicontrol

For the widget (or any fast charge toggle) to work, you MUST be running a kernel that has this patch implemented.

As a good gesture to support a fellow dev, I ask that if you implement the patch into your kernel, please link to my widget as one means to toggle it. You are of course free to provide other ways to toggle it as well if you so desire.

Kernel devs, if you would like to test the widget yourself to confirm its working, and for convenience of testing, please contact me and I will provide you with a copy. You must show that you are a kernel dev though (i.e. link me to your kernel post so I can match your username).

http://www.incredikernel.com/wp-con.../download.php?id=vivo_force_fast_charge.patch

Can you make a Kernel for sense Rom with that and uv support?

Sent from my HTC Incredible S using xda premium

highKo · Jul 9, 2012

ignore---sry

JerryBYong · Aug 25, 2012

Hi, I'm using Nik's Project X and I would really really like to be able to force ac charge as I lost my original HTC charger. How can I go about doing this

vizzy · Aug 25, 2012

JerryBYong said:
Hi, I'm using Nik's Project X and I would really really like to be able to force ac charge as I lost my original HTC charger. How can I go about doing this

Downloading the widget should be sufficient.

Sent from my HTC Incredible S using Tapatalk 2

JerryBYong · Aug 25, 2012

I just got the widget, and it says kernel not supported. What kernel must I use and how do I install it

Sent from my HTC Incredible S using xda premium

poondog · Aug 25, 2012

JerryBYong said:
I just got the widget, and it says kernel not supported. What kernel must I use and how do I install it

Sent from my HTC Incredible S using xda premium

A kernel with force ac charging included, like the one itandy made a while ago for ice cold sandwich
Edit: found it
http://xdaforums.com/showthread.php?t=1686995

Sent from my Nexus 7

JerryBYong · Aug 25, 2012

markj338 said:
A kernel with force ac charging included, like the one itandy made a while ago for ice cold sandwich
Edit: found it
http://xdaforums.com/showthread.php?t=1686995

Sent from my Nexus 7

Ok but that kernel is a asop one and I'm project x is a sense rom right? So its not compatible

Sent from my HTC Incredible S using xda premium

poondog · Aug 25, 2012

JerryBYong said:
Ok but that kernel is a asop one and I'm project x is a sense rom right? So its not compatible

Sent from my HTC Incredible S using xda premium

Yeah it won't work, its one of those 'wait for source' things but now that we have it, the code needs to be merged into the kernel

JerryBYong · Aug 25, 2012

markj338 said:
Yeah it won't work, its one of those 'wait for source' things but now that we have it, the code needs to be merged into the kernel

So there's nothing that can be done?

Sent from my HTC Incredible S using xda premium

poondog · Aug 25, 2012

JerryBYong said:
So there's nothing that can be done?

Sent from my HTC Incredible S using xda premium

Can be done, since we have kernel sources as of yesterday
Just that someone needs to do it

JerryBYong · Aug 25, 2012

If you don't mind, will you pm me when there is a kernel for project x?

Sent from my HTC Incredible S using xda premium

poondog · Aug 25, 2012

JerryBYong said:
If you don't mind, will you pm me when there is a kernel for project x?

Sent from my HTC Incredible S using xda premium

L0st.prophet's kernel works for project x, just doesn't have force ac
I will let you know if I remember
maybe you could put a request in his kernel thread

[KERNEL PATCH] Force AC (fast) Charging

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