Man page 9 : bus_find_device

bus_find_device - device iterator for locating a particular device.

struct device * bus_find_device(struct bus_type *  bus , struct device *  start , void *  data , int (* match ) (struct device *dev, void *data));

bus
    bus type

start
    Device to begin with

data
    Data to pass to match function

match
    Callback function to check device

This is similar to the bus_for_each_dev function above, but it returns a reference to a device that is AqfoundAq for later use, as determined by the match callback.

The callback should return 0 if the device doesnAqt match and non-zero if it does. If the callback returns non-zero, this function will return to the caller and not iterate over any more devices.