How to contorl I2C device or GPIO device in the kernel.
 

Dear Sir.

My env is see below
- Platform : x86 atom rangeley.
- linux kernel : 4.7.0

Linux kernel is already support I2C device driver and GPIO device driver.
And this device is successfully worked.

If i was loading the "i2c-i801.ko", created the "/dev/i2c-0" and can running.

If i was loading the "gpio-ich.ko", created the "/sys/class/gpio" and can running.

But my goal ls create the new kernel device driver.
And I must contorl i2c and gpio in the my new device driver.

Never use the file descriptor on user space. Just use the kernel APIs.

But I don't know "How to can get some descriptor for I2C, GPIO in kernel space".

Some kernel code use the special API(ex. get_deviceXXXX()).

Could you support some example code?

Thank you.

Example code would be in the kernel within the kernel driver sources for GPIO and I2C.

That is your best reference.

And you may want to request that a moderator move your thread to the Linux Kernel forum.