Many HID Improvements For Linux 4.1, Wacom Bamboo Pads Properly Supported
Among the highlights for this generally interesting subsystem are a merging of the hid-huion driver into hid-uclogic due to overlapping functionality, i2c-hid now supporting ACPI GPIO interrupts, improvements to the Logitech lg4ff driver that provides force feedback support for Logitech Gaming Wheels, multi-touch support for clickpads, major updates to the hid-sensor framework, and the Wacom driver now supports i2c-connected devices as well as Bamboo PADs now being properly supported. The Wacom driver also has improved battery reporting and pen proximity clean-ups. There's also the usual device ID additions and other code clean-ups / bug-fixes throughout the HID subsystem.
One of the Wacom Bamboo Pads.
More details on the HID changes for the Linux 4.1 merge window can be found via the Indiana LKML archives.