Android i2c drivers, where to start?

Andrew Miller1

I realize this is a mundane question for a technical support forum, but Im rather desperate, and have been shunned from other forum.

I would like to know where to start for learning to program I2C device drivers specifically in an Android Device. I realize that its similar to Linux, but I have referenced "Linux Device Drivers", "Building Linux Embedded Systems", and "Embedded Android" (Oreilly Media), and non have a definitive description of where to start.

I have a sensor that I am trying to run on a development board similar to Beaglebone, and it functions more like a hub for other sensors and performs sensor fusion. So it needs to have many different kinds of access, not just reading and fetching axis or measurements.

Thanks all for any help,

humbly,

Andrew

over 12 years ago

0 Greenja over 12 years ago

Guru 22270 points

Hello Andrew,

Welcome to the Forum!

You may want to look at the original i2c documentation from NXP (Philips).

There is also a C version for the CC2540 that may help in your understanding of the protocol.

Finally, you can visit the i2c forum and search through it for Android based i2c.

Thanks,

0 Andrew Miller1 over 12 years ago in reply to Greenja

Prodigy 30 points

Hello greenja,

Thank you for your response, that link to another thread is very helpful. I am rather familiar with the protocol itself, its just the i2c subsystem that confuses me. I can't seem to find the right files to implement to make a driver.

In this forum (http://e2e.ti.com/support/interface/etc_interface/f/390/p/202938/729372.aspx#729372) they said that a particular i2c line is programmed in <kernel>/arch/arm/mach-omap2, and there appear to be 3 different i2c.h and .c files. Its not immediately obvious to me what structs i need to use and how I need to implement these. Can you help me at all or point me in a direction?

I appreciate your help. I'm a student and intern and I'm still trying to figure this stuff out.

cheers,

Andrew

0 Manuel Contreras over 12 years ago in reply to Andrew Miller1

TI__Genius 10545 points

Have you checked the directory Documentation/i2c/ in kernel source code? it contains general information about I2C driver.

0 Andrew Miller1 over 12 years ago in reply to Manuel Contreras

Prodigy 30 points

Hello, yes I am still trying to figure out how to use it. Its just hard to figure out how to use it, I have to re-build my system when ever I want to try something. Is there a quicker way to test my drivers?

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Android i2c drivers, where to start?