How to hook up Linux Device Driver in Android Framework?

[parth shah]

Hello Guys,

I'm new to android but i know how to develop device driver in Linux.

Can anybody guide me on how android middle ware basically call driver?

where i have to make the change if i want to make the link between Linux Device Driver and android middle ware?

Regards,
Parth

[Chris Stratton]

There are tons of different ways you could potentially do this and
make it work, several of which are used for different features
already. The challenge is more that if you hope to get the result of
your project through google CTS testing to become a google experience
device, you'll have to find a way that's compatible with the
applicable rules there, and so will probably need to spend more time
researching those rules than actually writing code.

Otherwise, find some already supported feature that seems like it
shares some key characteristics with what you want to add, look into
how that works, and see if you can do yours in a similar fashion.

[parth shah]

Hi Chris,

Thanks for your reply. I'm not worry about google CTS now.

Can you point me some reference material or website where i can find this detail?

Thanks,
Parth

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[Chris Stratton]

android.git.kernel.org both for the kernel side and the android
userland halves of the interface.

You'll have better luck if you pick a specific existing feature and
research how that works. If you have some familiarity with linux in
general, just browsing around on an android device's filesystem, it's /
dev files, its kernel config, etc will give you some idea of some
interesting places to look.

On Jan 28, 2:35 pm, parth shah <parthmshah2...@gmail.com> wrote:
> Hi Chris,
>
> Thanks for your reply. I'm not worry about google CTS now.
>
> Can you point me some reference material or website where i can find this
> detail?
>
> Thanks,
> Parth
>

> On Thu, Jan 27, 2011 at 9:53 PM, Chris Stratton <cs07...@gmail.com> wrote:
> > There are tons of different ways you could potentially do this and
> > make it work, several of which are used for different features
> > already.  The challenge is more that if you hope to get the result of
> > your project through google CTS testing to become a google experience
> > device, you'll have to find a way that's compatible with the
> > applicable rules there, and so will probably need to spend more time
> > researching those rules than actually writing code.
>
> > Otherwise, find some already supported feature that seems like it
> > shares some key characteristics with what you want to add, look into
> > how that works, and see if you can do yours in a similar fashion.
>
> > On Jan 26, 4:01 am, parth shah <parthmshah2...@gmail.com> wrote:
> > > Hello Guys,
>
> > > I'm new to android but i know how to develop device driver in Linux.
>
> > > Can anybody guide me on how android middle ware basically call driver?
>
> > > where i have to make the change if i want to make the link between Linux
> > > Device Driver and android middle ware?
>
> > > Regards,
> > > Parth
>
> > --

> > unsubscribe: android-kerne...@googlegroups.com<android-kernel%2Bunsu...@googlegroups.com>
> > website:http://groups.google.com/group/android-kernel
>
>

[raja pavan]

Hi Parth

 

Drivers added by android to the vanila linux kernel can be downloaded, from android kernel.git. (snapshot mode)

 

Download android linux kernel , cd drivers/staging/android and you will see all the android drivers in the folder. (binder, ashmem, alarm, power, apanic,  etc)

 

Also download android sdk source code. source.android.com

 

grep "open_binder", "/dev/ashmem" in the android source code . This will provide you clue on how android utilizes the drivers.

 

Also see this ....

 

Android Java Code -> JNI Calls -> C Code (This will call open, close on the android driver nodes /dev/ashmem, /dev/binder etc)

 

Hope this helps you.

 

Wishes

Raja

 

 

 

--

[Chris Stratton]

> grep "open_binder", "/dev/ashmem" in the android source code . This will
> provide you clue on how android utilizes the drivers.

While binder is a kernel driver, it's used primarily for communication
between userspace components, not between the userspace components and
functionality in the kernel.

But most functionality in the kernel that is android specific rather
than generic *nix (and even some that is standard but semi privileged)
likely uses binder to connect the application to an android service in
userspace, which in turn uses one of a variety of interface into the
kernel.

[raja pavan]

So please specify your requirement.

What do you want in the android kernel about drivers. 

Android drivers is the common thing, so what else do you want?

[Aditya]

Can you give me some reference materials on writing drivers for video capture devices. I am fairly new to writing drivers. All i know is c, C++ and some very basic file systems hacking on minx from school.
Thanks in Advance

-Aditya

--
Aditya Mukherjee
Rutgers University
Department Of Computer Science

[Greg KH]

On Mon, Jan 31, 2011 at 1:44 PM, Aditya <aditya.s....@gmail.com> wrote:
> Can you give me some reference materials on writing drivers for video
> capture devices. I am fairly new to writing drivers. All i know is c, C++
> and some very basic file systems hacking on minx from school.

Please see the linux-media mailing lists and documentation for how to do this.
Have you tried that first?
All of your questions should be able to be answered by the developers on that
list.

good luck,

greg k-h

[Aditya]

thanks for that ...  sorry didnt reply sooner... was busy at work... i'll try that out.

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[Durgadoss Ramanathan]

Hi Parth,

Have a look at the system services, and the corresponding JNI's.

To be more specific, (for example,) for battery related information and linking,
look at BatteryService.java and com_android_server_BatteryService.cpp

Thanks,
Durga

On Thu, Oct 25, 2012 at 3:31 AM, Prerna Gupta <prernag...@gmail.com> wrote:

Hi Parth,

 

I do have one rek if you are comfortable kindly send me your resume on pre...@net2source.com

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Durgadoss