Thank you for the information. The source code is informative, but as
you said it is hard to understand without knowledge to the hardware
architecture.
My post has been delayed for more than one week (due to Xmas, I think).
In fact about MSM RPC mechanism I have found a very useful article
explaining it. Here it is:
http://www.eetimes.com/electronics-news/4083262/Google-Android-IPC-at-the-lowest-levels
Hope that article will be helpful.
On 2012/1/4 14:28, Hemanth(ヘマント) wrote:
Hi,
I think some of the information that you are looking for might be
proprietary.
For almost anything MSM related, a good place to start is codeaurora.
Some platforms do use the standalone ICs (bq27xxx)
https://www.codeaurora.org/gitweb/quic/le/?p=kernel/msm.git;a=commitdiff;h=339f30bc1ad4adaf3a05fae0abd21cc3afab6c44
You can check your defconfig to see which of the "CONFIG_BATTERY_XXX"
are being used.
For the battery related RPC, you can check the code here:
https://www.codeaurora.org/gitweb/quic/le/?p=kernel/msm.git;a=blob;f=drivers/power/msm_battery.c;h=055539934e4ea247b56bec7b70c28fa04d37ff57;hb=98f5fd413f051db8407a53f583a46a1c3fb99657
As for the RPC operation itself, you can see the code on linux side
from arch/arm/mach-msm.
It's a bit hard to parse..
On Dec 27 2011, 2:34 pm, Pei Wang<[email protected]> wrote:
Hi,
I am now trying to do something to make the kernel be better at
tracking energy consumption, and I am using HTC Incredible 2 as my
development device. However, I got confused when dealing with MSM
platform. I just cannot understand how MSM chipsets implement battery
fuel gauge. It seems that phones based on MSM processors do not use
any individual fuel gauge IC such as MAX17042 or DS2784. I guess that
MSM processors have their own fuel gauge IC integrated in the
chipsets, and communicate with these IC via MSM RPC, but I am not sure
for this. In fact, I don't know what MSM RPC is and how it works
either.
So in sum my question is how MSM based phone sense battery voltage and
current? Besides that, materials introducing MSM RPC will also be
helpful. Can anybody give me some instructions on how to get the
answer? Thanks in advance.
Best Regards,
Pei Wang
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