Question

Can I pass NULL pointer to the first argument of device_create function?

I’m using device_create() to create character device file in sysfs. This file don’t represent any physical device (it is used to provide an access to a set of devices connected to various buses). What class should I use with device_create() to create such a file?

Answer 1

You can create your own struct class to put the devices under. For example:

your_class = class_create(THIS_MODULE, "your-fake-devices");

You’ll then be able to find any devices you create as /sys/class/your-fake-devices/device-name/