device_register(9) [centos man page]

DEVICE_REGISTER(9)					   Device drivers infrastructure					DEVICE_REGISTER(9)

NAME

       device_register - register a device with the system.

SYNOPSIS

       int device_register(struct device * dev);

ARGUMENTS

       dev
	   pointer to the device structure

DESCRIPTION

       This happens in two clean steps - initialize the device and add it to the system. The two steps can be called separately, but this is the
       easiest and most common. I.e. you should only call the two helpers separately if have a clearly defined need to use and refcount the device
       before it is added to the hierarchy.

       For more information, see the kerneldoc for device_initialize and device_add.

NOTE

       _Never_ directly free dev after calling this function, even if it returned an error! Always use put_device to give up the reference
       initialized in this function instead.

COPYRIGHT

Kernel Hackers Manual 3.10					     June 2014							DEVICE_REGISTER(9)

DEVICE_CREATE_VARGS(9)					   Device drivers infrastructure				    DEVICE_CREATE_VARGS(9)

NAME

       device_create_vargs - creates a device and registers it with sysfs

SYNOPSIS

       struct device * device_create_vargs(struct class * class, struct device * parent, dev_t devt, void * drvdata, const char * fmt,
					   va_list args);

ARGUMENTS

       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 device's name

       args
	   va_list for the device's name

DESCRIPTION

       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.

NOTE

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

COPYRIGHT

Kernel Hackers Manual 2.6.					     July 2010						    DEVICE_CREATE_VARGS(9)