Man page 9 : device_create

device_create - creates a device and registers it with sysfs

struct device * device_create(struct class *  class , struct device *  parent , dev_t  devt , void *  drvdata , const char *  fmt , ... );

class
    pointer to the struct class that this device should be registered to

parent
    pointer to the parent struct device of this new device, if any

devt
    the dev_t for the char device to be added

drvdata
    the data to be added to the device for callbacks

fmt
    string for the deviceAqs name

...
    variable arguments

This function can be used by char device classes. A struct device will be created in sysfs, registered to the specified class.

A « dev » file will be created, showing the dev_t for the device, if the dev_t is not 0,0. If a pointer to a parent struct device is passed in, the newly created struct device will be a child of that device in sysfs. The pointer to the struct device will be returned from the call. Any further sysfs files that might be required can be created using this pointer.

Returns struct device pointer on success, or ERR_PTR on error.

the struct class passed to this function must have previously been created with a call to class_create.