[Tutorial] LinuxI2C device driver

[Tutorial] Linux I2C device driver-Linux general technology-Linux programming and kernel information. The following is a detailed description. My ARM platform is Cortex A9. The MSP430 microcontroller communicates with the ARM-core I2C bus. the ARM runs on a Linux system and the Linux kernel has an I2C bus driver.
Therefore, in addition to the MSP430 program, I also need to develop the Linux driver for the MSP430 on the ARM side. Problem:
(1) chip I2C bus driver on the kernel, then I can use the kernel in the application device driver i2c-dev.c open, read, write and other interfaces, instead of re-developing a device driver?
(2) if necessary, how should we develop the corresponding device driver? in Linux, the application layer interfaces are open, release, read, and write? Can I modify only a few external file operation interfaces by referring to the function in the i2c_dev.c file? Or is there any reference program? Or there are examples to help you send the best...
(3) How can I obtain the address of the MSP430 device on the I2C bus?

The entire development process of Linux I2C driver for the first time is also a bit messy. thank you for your guidance !!