[PATCH v2 0/3] HID: nintendo: Add preliminary Switch 2 controller driver

[Vicki Pfau <vi@endrift.com>]

This series adds preliminary support for Switch 2 controllers. As with v1,
it does not support Bluetooth controllers and does not contain IMU or
battery support. However, several significant changes have been made:

First and foremost, the driver has been folded into hid-nintendo instead of
a separate hid-switch2 driver. This allowed reuse of some small bits of
hid-nintendo's existing support, but not a signiicant amount.

Secondly, the configuration interface API has been changed to make the
switch2_controller struct opaque. As the configuration interface is
effectively just a dumb sidechannel used for passing data that is the same
regardless of transit, there is no need for it to have any internal state
knowledge.

Thirdly, it adds support for "unified" format that had been left as a TODO
in the previous version. Though it does not directly enable said format,
it's good to have for future purposes.

It also addresses the other TODO regarding partial initialization,
guaranteeing a consistent state after setup, regardless of whether or not
an userspace process has claimed an then released control of the USB
interface.

Finally, it fixes a number of bugs, including some missing locks and race
conditions that could trigger a kernel panic if the USB configuration
interface was claimed or released from userspace.

For ease of reviewing, the series has been split into three patches, though
the bulk of the code is still in the first patch.

Vicki Pfau (3):
  HID: nintendo: Add preliminary Switch 2 controller driver
  HID: nintendo: Add rumble support for Switch 2 controllers
  HID: nintendo: Add unified report format support

 MAINTAINERS                                   |    1 +
 drivers/hid/Kconfig                           |   19 +-
 drivers/hid/hid-ids.h                         |    4 +
 drivers/hid/hid-nintendo.c                    | 1507 ++++++++++++++++-
 drivers/hid/hid-nintendo.h                    |   72 +
 drivers/input/joystick/Kconfig                |   11 +
 drivers/input/joystick/Makefile               |    1 +
 drivers/input/joystick/nintendo-switch2-usb.c |  352 ++++
 8 files changed, 1953 insertions(+), 14 deletions(-)
 create mode 100644 drivers/hid/hid-nintendo.h
 create mode 100644 drivers/input/joystick/nintendo-switch2-usb.c

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2.53.0