hid-asus-ally: Add full gamepad support

This driver adds full support of the ASUS ROG Ally gamepad:

- dinput is translated to XBox controller (Ally-X only)
- default mode has the QAM buttons mapped (Ally-X only)
  * left is XBox button
  * right is an XBox + A combo for steam QAM
- force feedback is supported (Ally-X only)
- LED brightness control (0-2)
- LED multicolor class support
- Support all configuration

The configuration options available are:

- Gamepad mode (game, wasd, mouse)
- Remapping each button, plus macro map (hold a macro button and press other)
- Joystrick and trigger deadzones
- Gamepad vibration intensity
- Leds (using multicolor class)
- Button turbo abilities (per button)
- Joystick repsonse curves
- Joystick anti-deadzones

The attribute path tree looks like this:

- `./sys/../<USB HID>/`
  - `joystick_left/
    - `deadzone`
    - `mapping` (mouse, wasd, custom)
    - `anti_deadzone`
    - `response_curve`
    - `calibration`
    - `calibration_reset`
  - `trigger_left/
    - `deadzone`
    - `response_curve`
    - `calibration`
    - `calibration_reset`
  - `gamepad_mode`
  - `button_mapping`
    - `A`
    - `B`
    - `dpad_left`
    - etc

No settings are applied until `apply_all` is written to. The exception is
for calibrations.

While there is calibration ability, it can be difficult to get correct
and is heavily device dependent, as such it is set when written and not
when `apply_all` is written to. On driver load the set calibrations are
retrieved - this may be what you've set in Linux, Windows, or factory
defaults.

Signed-off-by: Luke D. Jones <luke@ljones.dev>

.clang-format

@@ -52,7 +52,7 @@ BreakConstructorInitializersBeforeComma: false
 BreakConstructorInitializers: BeforeComma
 BreakAfterJavaFieldAnnotations: false
 BreakStringLiterals: false
-ColumnLimit: 80
+ColumnLimit: 100
 CommentPragmas: '^ IWYU pragma:'
 CompactNamespaces: false
 ConstructorInitializerAllOnOneLineOrOnePerLine: false

drivers/hid/Kconfig

@@ -164,6 +164,15 @@ config HID_ASUS
 	- GL553V series
 	- GL753V series
 
+config HID_ASUS_ALLY
+    tristate "Asus Ally gamepad configuration support"
+    depends on USB_HID
+    depends on LEDS_CLASS
+    depends on LEDS_CLASS_MULTICOLOR
+    select POWER_SUPPLY
+    help
+    Support for configuring the Asus ROG Ally gamepad using attributes.
+
 config HID_AUREAL
 	tristate "Aureal"
 	help

drivers/hid/Makefile

@@ -31,6 +31,7 @@ obj-$(CONFIG_HID_APPLE)		+= hid-apple.o
 obj-$(CONFIG_HID_APPLEIR)	+= hid-appleir.o
 obj-$(CONFIG_HID_CREATIVE_SB0540)	+= hid-creative-sb0540.o
 obj-$(CONFIG_HID_ASUS)		+= hid-asus.o
+obj-$(CONFIG_HID_ASUS_ALLY)	+= hid-asus-ally.o
 obj-$(CONFIG_HID_AUREAL)	+= hid-aureal.o
 obj-$(CONFIG_HID_BELKIN)	+= hid-belkin.o
 obj-$(CONFIG_HID_BETOP_FF)	+= hid-betopff.o