[PATCH 0/5] HID: playstation: various DS4 and DualSense fixes

[Roderick Colenbrander <roderick@gaikai.com>]

Hi,

This patch set contains a number of small fixes and stability improvements.

The stability patches are most critical as they prevent kernel crashes.
Over the years there have been various buggy devices usually clone devices,
but now apparently some official devices with wiped calibration data.
It is hard to handle all permutations of devices as some have constants,
some have broken constants (e.g. wrong sign of a coefficient). We disable
calibration when we see an invalid 0 denominator. The patch adds the same
logic to both the DualShock4 and DualSense code.

As part of the calibration stability improvements, a thorough review was
performed of the calibration code as it was suspected it was potentially
incorrect. It was found to be only slightly wrong for the handling of the
bias of the gyroscopes. Two patches fix this for both DualShock4 and DualSense.
There is only a marginal impact on practical values as the bias values
tend to be quite small.

Thanks,
Roderick Colenbrander
Sony Interactive Entertainment, LLC

Roderick Colenbrander (5):
  HID: playstation: fix DualShock4 unreachable calibration code.
  HID: playstation: sanity check DualShock4 calibration data.
  HID: playstation: sanity check DualSense calibration data.
  HID: playstation: correct DualShock4 gyro bias handling.
  HID: playstation: correct DualSense gyro bias handling.

 drivers/hid/hid-playstation.c | 104 +++++++++++++++++++++++++++-------
 1 file changed, 85 insertions(+), 19 deletions(-)

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2.38.1