[Kernel mod] enable USB fast charging(now in the jawz101 kernel!

**jawz101** · 08-14-2012, 11:04 AM

XDA user chad0989 made a to enable USB fast charging on several phones. Even some cheap car chargers I've had have been recognized as USB power and, consequently, the phone drains faster than it charges if I had, say, Maps and bluetooth going.

It's now ported over to the Optimus V jawz101 kernel for gingerbread IHO phones.
to see what was done to enable it on other variants

chad0989 even made a little toggle app on the Google Play store

... I will be making a similar toggle app made with Tasker & will post a download some time in the next week or so.

The only drawback noted is USB mass storage won't work while it's drawing more power but who cares. That's why there's a way to toggle.
As far as safety is concerned it's been reported safe by many which makes sense since this is just getting the phone to charge as fast as a wall charger would go.

To toggle fast charging from terminal you'd need to issue the command:
on:

Code:

echo 1 > /sys/kernel/fast_charge/force_fast_charge

and off:

Code:

echo 0 > /sys/kernel/fast_charge/force_fast_charge

Attached are before & after screenshots of my phone connected to my laptop. The app I used is to get the mA power draw.

**sammyz** · 08-14-2012, 11:10 AM

Hmmm, I have Ubuntu set up right now to build kernels, but I don't have a V to test on......

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**sellers86** · 08-14-2012, 01:27 PM

Originally Posted by sammyz

Hmmm, I have Ubuntu set up right now to build kernels, but I don't have a V to test on......

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make it flashable, Ill probably test. Im sure a lot of people would

**ThatGuyLurkin** · 08-14-2012, 01:52 PM

+1

Isn't this built in on AOKP too?

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**sammyz** · 08-14-2012, 02:22 PM

Originally Posted by sellers86

make it flashable, Ill probably test. Im sure a lot of people would

Will download OV kernel source and try to build when I get home.
Edit: gonna try on ICS kernel first, then GB if it fails.

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**jawz101** · 08-14-2012, 02:22 PM

Originally Posted by sellers86

make it flashable, Ill probably test. Im sure a lot of people would

does the actual patch look like it's something flashable? The commands to execute it could be once the functionality is baked into the kernel but I dunno.

Originally Posted by ThatGuyLurkin

+1
Isn't this built in on AOKP too?

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I'm pretty sure it is. I'm still stuck on the GB Roms though

**sammyz** · 08-14-2012, 02:30 PM

Originally Posted by jawz101

does the actual patch look like it's something flashable? The commands to execute it could be once the functionality is baked into the Rom.
I could even make a little free Tasker AppFactory app anyone could use once it was put in the kernel. or see if the GB Rom builders could incorporate it into the CM settings.

What are the commands? And you would just flash kernel and then execute commands in terminal .....

Edit: nvm, never bothered to look at xda....

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**jawz101** · 08-14-2012, 02:40 PM

well there's code for the function that goes into the kernel & then you run a script from terminal or whatnot to toggle fast charging off & on since you'll still want to be able to turn it off when you want to connect your phone to your laptop & access the SD card storage.
It could be set to always be on and not have a toggle but there'd still need to be the kernel piece that says set USB to be AC power or back to USB power.

I don't know if you can make the patch a flashable thing, though.

**sammyz** · 08-14-2012, 02:44 PM

Originally Posted by jawz101

well there's code for the function that goes into the kernel & then you run a script from terminal or whatnot to toggle fast charging off & on since you'll still want to be able to turn it off when you want to connect your phone to your laptop & access the SD card storage.
It could be set to always be on and not have a toggle but there'd still need to be the kernel piece.

I don't know if you can make the patch a flashable thing, though.

Anything is flashable. Any app replacement, adding /replacing files, it can always be done via recovery.

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**Zakman** · 08-14-2012, 03:03 PM

Can someone patch this to thekravens test 15 kernel??? I'd like to use it in cm10

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**ThatGuyLurkin** · 08-14-2012, 03:33 PM

Seeing as it's a kernel patch, I wonder if TDM included it in his kernel.

And yeah, all I use is Gingerbread :P

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**sammyz** · 08-14-2012, 07:57 PM

Originally Posted by Zakman

Can someone patch this to thekravens test 15 kernel??? I'd like to use it in cm10

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Get me the source please, I'll build as soon as I have time......not today, maybe tomorrow or Thursday ....

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**sellers86** · 08-14-2012, 08:02 PM

Originally Posted by sammyz

Get me the source please, I'll build as soon as I have time......not today, maybe tomorrow or Thursday ....

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Should be at github.com/thekraven

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**sammyz** · 08-14-2012, 08:23 PM

Originally Posted by sellers86

Should be at github.com/thekraven

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ics13,17,18,19......no 15 :/
edit: nvm was looking at rom source instead of kernel source.....need coffee

**sammyz** · 08-15-2012, 08:15 AM

Someone running thekraven's test 15 kernel, run this command and upload the file please

adb pull /proc/config.gz

You will find config.gz in same directory as adb.

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**Zakman** · 08-15-2012, 08:46 AM

error: device not found.

**sammyz** · 08-15-2012, 12:03 PM

Originally Posted by Zakman

error: device not found.

Adb is not set up correctly ........anyone else?

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**bigsupersquid** · 08-15-2012, 01:09 PM

This patch is written to go into another device/board and needs modification to build for thunderc.

**sammyz** · 08-15-2012, 01:31 PM

Originally Posted by bigsupersquid

This patch is written to go into another device/board and needs modification to build for thunderc.

I figured that would be a problem...and figured some editing needs to be done...

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**jawz101** · 08-15-2012, 01:46 PM

Originally Posted by bigsupersquid

This patch is written to go into another device/board and needs modification to build for thunderc.

most def. that's where I'm trying to figure out what files I need to touch:
FROM THE PATCH
/arch/arm/mach-s5pv210/Kconfig
+config FORCE_FAST_CHARGE

/arch/arm/mach-s5pv210/Makefile
+obj-$(CONFIG_FORCE_FAST_CHARGE)

/arch/arm/mach-s5pv210/fastchg.c *new file
+#include <linux/fastchg.h>

/arch/arm/mach-s5pv210/mach-herring.c
+#ifdef CONFIG_FORCE_FAST_CHARGE
+#include <linux/fastchg.h>

/include/linux/fastchg.h *new file

FOR VM670
/arch/arm/mach-msm/Kconfig?
+config FORCE_FAST_CHARGE

/arch/arm/mach-msm/Makefile?
+obj-$(CONFIG_FORCE_FAST_CHARGE)

/arch/arm/mach-msm/fastchg.c *new file
+#include <linux/fastchg.h>

/arch/arm/mach-msm/???.c
+#ifdef CONFIG_FORCE_FAST_CHARGE
+#include <linux/fastchg.h>

/include/linux/fastchg.h *new file

I don't know if I need to go into the makefile & kconfig in \arch\arm\mach-msm & edit those or arch\arm\mach-msm\lge\ to edit them

**sammyz** · 08-15-2012, 02:28 PM

Try one, build, flash, if it fails, try /lge, build, flash...

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**sammyz** · 08-15-2012, 08:47 PM

Originally Posted by sellers86

Should be at github.com/thekraven

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test15 is actually on bitbucket.org......compiling test15 now

Link to test15:

**sammyz** · 08-15-2012, 09:31 PM

look further in this thread for flashable and sources

**jawz101** · 08-15-2012, 09:54 PM

schweet. I just got done doing it for my kernel though I haven't tested it yet.

**sammyz** · 08-16-2012, 06:51 AM

Anyone test mine??? Btw jawz, I added patch to /arch/arm/mach-msm/lge and for the something_Herring.c I added to device_lge.c I think it's called.

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