Linux Device Drivers Development

The probe() function

The probe() function is a part of the struct i2c_driver structure, and is executed anytime, once an I2C device is instantiated. It is responsible for the following tasks:

• Check whether the device is the one you expected
• Check whether your I2C bus controller of the SoC supports the functionality needed by your device, using the i2c_check_functionality function
• Initialize the device
• Set up device-specific data
• Register the appropriate kernel framework

The probe function's prototype is as follows:

static int foo_probe(struct i2c_client *client, const struct i2c_device_id *id) 

As you can see, its parameters are:

• struct i2c_client pointer: This represents the I2C device itself. This structure inherits from the structure ...