bus_for_each_dev(9) [suse man page]

BUS_FOR_EACH_DEV(9)					   Device drivers infrastructure				       BUS_FOR_EACH_DEV(9)

NAME

       bus_for_each_dev - device iterator.

SYNOPSIS

       int bus_for_each_dev(struct bus_type * bus, struct device * start, void * data, int (*fn) (struct device *, void *));

ARGUMENTS

       bus
	   bus type.

       start
	   device to start iterating from.

       data
	   data for the callback.

       fn
	   function to be called for each device.

DESCRIPTION

       Iterate over bus's list of devices, and call fn for each, passing it data. If start is not NULL, we use that device to begin iterating
       from.

       We check the return of fn each time. If it returns anything other than 0, we break out and return that value.

NOTE

       The device that returns a non-zero value is not retained in any way, nor is its refcount incremented. If the caller needs to retain this
       data, it should do so, and increment the reference count in the supplied callback.

COPYRIGHT

Kernel Hackers Manual 2.6.					     July 2010						       BUS_FOR_EACH_DEV(9)

DEVICE_CREATE(9)					   Device drivers infrastructure					  DEVICE_CREATE(9)

NAME

       device_create - creates a device and registers it with sysfs

SYNOPSIS

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

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

       ...
	   variable arguments

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 3.10					     June 2014							  DEVICE_CREATE(9)