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The B in front stands for bitmap, N, P, S, U, H are simply first letter in corresponding name value and I is for ID. In ordered fashion:

• I => @id: id of the device  (struct input_id)
  • Bus     => id.bustype
  • Vendor  => id.vendor
  • Product => id.product
  • Version => id.version
• N => name of the device.
• P => physical path to the device in the system hierarchy.
• S => sysfs path.
• U => unique identification code for the device (if device has it).
• H => list of input handles associated with the device.
• B => bitmaps
  • PROP => device properties and quirks.
  • EV   => types of events supported by the device.
  • KEY  => keys/buttons this device has.
  • MSC  => miscellaneous events supported by the device.
  • LED  => leds present on the device.

Then check input.h you find that they correspond to:

To check what they mean a quick introduction is given by kernel Documentation.

The B in front stands for bitmap, N, P, S, U, H are simply first letter in corresponding name value and I is for ID. In ordered fashion:

• I => @id: id of the device (struct input_id)
  • Bus     => id.bustype
  • Vendor  => id.vendor
  • Product => id.product
  • Version => id.version
• N => name of the device.
• P => physical path to the device in the system hierarchy.
• S => sysfs path.
• U => unique identification code for the device (if device has it).
• H => list of input handles associated with the device.
• B => bitmaps
  • PROP => device properties and quirks.
  • EV   => types of events supported by the device.
  • KEY  => keys/buttons this device has.
  • MSC  => miscellaneous events supported by the device.
  • LED  => leds present on the device.

Then check input-event-codes.h you find that they correspond to:

To check what they mean a quick introduction is given by Kernel documentation.

##Bitmasks

##Decoding 120013

Bitmasks

Decoding 120013

This, "EDIT 2 (continued):" in particular, might be of interest.

This, "EDIT 2 (continued):" in particular, might be of interest.