[PATCH v3 0/3] Input: joystick: xpad: Add X-Box Adaptive Controller support

[PATCH v3 0/3] Input: joystick: xpad: Add X-Box Adaptive Controller support

[Nate Yocom]

Adds support for the X-Box Adaptive Controller, which is protocol
compatible with the XTYPE_XBOXONE support in the driver with two deltas:

 - The X-Box button sets 0x02 as its activation ID, where others set
   0x01
 - The controller has an additional "Layer" button with 4 active states,
   which this change maps to an Axis control with 4 possible values

Patch series adds device to the supported table, adds support for the
Layer button, and adds support for the X-Box button as distinct changes.

Signed-off-by: Nate Yocom <nate@yocom.org>

Nate Yocom (3):
  Input: joystick: xpad: Add X-Box Adaptive Controller support
  Input: joystick: xpad: Add X-Box Adaptive Controller Layer button
  Input: joystick: xpad: Add X-Box Adaptive Controller XBox button

 v2: Fix warning Reported-by: kernel test robot <lkp@intel.com>
 v3: Break into multi-part and remove VID/PID check for XBox button

 drivers/input/joystick/xpad.c | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)


base-commit: 15205c2829ca2cbb5ece5ceaafe1171a8470e62b
-- 
2.30.2

[PATCH v3 1/3] Input: joystick: xpad: Add X-Box Adaptive Controller support

[Nate Yocom]

Adds correct VID/PID for this XTYPE_XBOXONE compatible controller to
xpad_device[] table.

Signed-off-by: Nate Yocom <nate@yocom.org>
---
 drivers/input/joystick/xpad.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/input/joystick/xpad.c b/drivers/input/joystick/xpad.c
index 18190b529bca..c8b38bb73d34 100644
--- a/drivers/input/joystick/xpad.c
+++ b/drivers/input/joystick/xpad.c
@@ -131,6 +131,7 @@ static const struct xpad_device {
 	{ 0x045e, 0x02e3, "Microsoft X-Box One Elite pad", 0, XTYPE_XBOXONE },
 	{ 0x045e, 0x02ea, "Microsoft X-Box One S pad", 0, XTYPE_XBOXONE },
 	{ 0x045e, 0x0719, "Xbox 360 Wireless Receiver", MAP_DPAD_TO_BUTTONS, XTYPE_XBOX360W },
+	{ 0x045e, 0x0b0a, "Microsoft X-Box Adaptive Controller", 0, XTYPE_XBOXONE },
 	{ 0x045e, 0x0b12, "Microsoft Xbox Series S|X Controller", MAP_SELECT_BUTTON, XTYPE_XBOXONE },
 	{ 0x046d, 0xc21d, "Logitech Gamepad F310", 0, XTYPE_XBOX360 },
 	{ 0x046d, 0xc21e, "Logitech Gamepad F510", 0, XTYPE_XBOX360 },
-- 
2.30.2

[PATCH v3 2/3] Input: joystick: xpad: Add X-Box Adaptive Controller Layer button

[Nate Yocom]

Adds a new quirk for controllers that have a Layer button which has 4
states, reflected as an ABS_MISC axis with 4 values.

Signed-off-by: Nate Yocom <nate@yocom.org>
---
 drivers/input/joystick/xpad.c | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/drivers/input/joystick/xpad.c b/drivers/input/joystick/xpad.c
index c8b38bb73d34..83a4f4d07af5 100644
--- a/drivers/input/joystick/xpad.c
+++ b/drivers/input/joystick/xpad.c
@@ -80,6 +80,7 @@
 #define MAP_TRIGGERS_TO_BUTTONS		(1 << 1)
 #define MAP_STICKS_TO_NULL		(1 << 2)
 #define MAP_SELECT_BUTTON		(1 << 3)
+#define MAP_LAYER_BUTTON		(1 << 4)
 #define DANCEPAD_MAP_CONFIG	(MAP_DPAD_TO_BUTTONS |			\
 				MAP_TRIGGERS_TO_BUTTONS | MAP_STICKS_TO_NULL)
 
@@ -131,7 +132,7 @@ static const struct xpad_device {
 	{ 0x045e, 0x02e3, "Microsoft X-Box One Elite pad", 0, XTYPE_XBOXONE },
 	{ 0x045e, 0x02ea, "Microsoft X-Box One S pad", 0, XTYPE_XBOXONE },
 	{ 0x045e, 0x0719, "Xbox 360 Wireless Receiver", MAP_DPAD_TO_BUTTONS, XTYPE_XBOX360W },
-	{ 0x045e, 0x0b0a, "Microsoft X-Box Adaptive Controller", 0, XTYPE_XBOXONE },
+	{ 0x045e, 0x0b0a, "Microsoft X-Box Adaptive Controller", MAP_LAYER_BUTTON, XTYPE_XBOXONE },
 	{ 0x045e, 0x0b12, "Microsoft Xbox Series S|X Controller", MAP_SELECT_BUTTON, XTYPE_XBOXONE },
 	{ 0x046d, 0xc21d, "Logitech Gamepad F310", 0, XTYPE_XBOX360 },
 	{ 0x046d, 0xc21e, "Logitech Gamepad F510", 0, XTYPE_XBOX360 },
@@ -927,6 +928,10 @@ static void xpadone_process_packet(struct usb_xpad *xpad, u16 cmd, unsigned char
 				 (__u16) le16_to_cpup((__le16 *)(data + 8)));
 	}
 
+	/* Layer button has a value of 0-4, so it is reported as an axis */
+	if (xpad->mapping & MAP_LAYER_BUTTON)
+		input_report_abs(dev, ABS_MISC, data[34]);
+
 	input_sync(dev);
 }
 
@@ -1623,6 +1628,9 @@ static void xpad_set_up_abs(struct input_dev *input_dev, signed short abs)
 	case ABS_HAT0Y:	/* the d-pad (only if dpad is mapped to axes */
 		input_set_abs_params(input_dev, abs, -1, 1, 0, 0);
 		break;
+	case ABS_MISC: /* 4 value layer button (such as on XAC) */
+		input_set_abs_params(input_dev, abs, 0, 4, 0, 0);
+		break;
 	default:
 		input_set_abs_params(input_dev, abs, 0, 0, 0, 0);
 		break;
@@ -1715,6 +1723,10 @@ static int xpad_init_input(struct usb_xpad *xpad)
 			xpad_set_up_abs(input_dev, xpad_abs_triggers[i]);
 	}
 
+	/* setup layer button as an axis with 4 possible values */
+	if (xpad->mapping & MAP_LAYER_BUTTON)
+		xpad_set_up_abs(input_dev, ABS_MISC);
+
 	error = xpad_init_ff(xpad);
 	if (error)
 		goto err_free_input;
-- 
2.30.2

[PATCH v3 3/3] Input: joystick: xpad: Add X-Box Adaptive Controller XBox button

[Nate Yocom]

Adaptive controller sets 0x02 bit for this button, all others set 0x01
so presence of either is used for BTN_MODE.

Signed-off-by: Nate Yocom <nate@yocom.org>
---
 drivers/input/joystick/xpad.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/input/joystick/xpad.c b/drivers/input/joystick/xpad.c
index 83a4f4d07af5..bea71721b6cd 100644
--- a/drivers/input/joystick/xpad.c
+++ b/drivers/input/joystick/xpad.c
@@ -859,7 +859,7 @@ static void xpadone_process_packet(struct usb_xpad *xpad, u16 cmd, unsigned char
 		if (data[1] == 0x30)
 			xpadone_ack_mode_report(xpad, data[2]);
 
-		input_report_key(dev, BTN_MODE, data[4] & 0x01);
+		input_report_key(dev, BTN_MODE, data[4] & 0x03);
 		input_sync(dev);
 		return;
 	}
-- 
2.30.2

Re: [PATCH v3 1/3] Input: joystick: xpad: Add X-Box Adaptive Controller support

[Bastien Nocera]

On Sat, 2022-08-13 at 11:53 -0700, Nate Yocom wrote:
> Adds correct VID/PID for this XTYPE_XBOXONE compatible controller to
> xpad_device[] table.
> 
> Signed-off-by: Nate Yocom <nate@yocom.org>

Have you tested the device in Bluetooth mode? My controller's battery
is still charging.

Tested-by: Bastien Nocera <hadess@hadess.net>

> ---
>  drivers/input/joystick/xpad.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/input/joystick/xpad.c
> b/drivers/input/joystick/xpad.c
> index 18190b529bca..c8b38bb73d34 100644
> --- a/drivers/input/joystick/xpad.c
> +++ b/drivers/input/joystick/xpad.c
> @@ -131,6 +131,7 @@ static const struct xpad_device {
>         { 0x045e, 0x02e3, "Microsoft X-Box One Elite pad", 0,
> XTYPE_XBOXONE },
>         { 0x045e, 0x02ea, "Microsoft X-Box One S pad", 0,
> XTYPE_XBOXONE },
>         { 0x045e, 0x0719, "Xbox 360 Wireless Receiver",
> MAP_DPAD_TO_BUTTONS, XTYPE_XBOX360W },
> +       { 0x045e, 0x0b0a, "Microsoft X-Box Adaptive Controller", 0,
> XTYPE_XBOXONE },
>         { 0x045e, 0x0b12, "Microsoft Xbox Series S|X Controller",
> MAP_SELECT_BUTTON, XTYPE_XBOXONE },
>         { 0x046d, 0xc21d, "Logitech Gamepad F310", 0, XTYPE_XBOX360
> },
>         { 0x046d, 0xc21e, "Logitech Gamepad F510", 0, XTYPE_XBOX360
> },

Re: [PATCH v3 2/3] Input: joystick: xpad: Add X-Box Adaptive Controller Layer button

[Bastien Nocera]

On Sat, 2022-08-13 at 11:53 -0700, Nate Yocom wrote:
> Adds a new quirk for controllers that have a Layer button which has 4
> states, reflected as an ABS_MISC axis with 4 values.

It's called the "Profile Button" in the official documentation:
https://support.xbox.com/en-US/help/account-profile/accessibility/get-to-know-adaptive-controller
so best to call it that.

I wonder we have any other examples of profile handling in input
drivers. The xpadneo driver implements the profiles in the kernel
driver directly.

Benjamin?

Tested-by: Bastien Nocera <hadess@hadess.net>

> 
> Signed-off-by: Nate Yocom <nate@yocom.org>
> ---
>  drivers/input/joystick/xpad.c | 14 +++++++++++++-
>  1 file changed, 13 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/input/joystick/xpad.c
> b/drivers/input/joystick/xpad.c
> index c8b38bb73d34..83a4f4d07af5 100644
> --- a/drivers/input/joystick/xpad.c
> +++ b/drivers/input/joystick/xpad.c
> @@ -80,6 +80,7 @@
>  #define MAP_TRIGGERS_TO_BUTTONS                (1 << 1)
>  #define MAP_STICKS_TO_NULL             (1 << 2)
>  #define MAP_SELECT_BUTTON              (1 << 3)
> +#define MAP_LAYER_BUTTON               (1 << 4)
>  #define DANCEPAD_MAP_CONFIG    (MAP_DPAD_TO_BUTTONS
> |                  \
>                                 MAP_TRIGGERS_TO_BUTTONS |
> MAP_STICKS_TO_NULL)
>  
> @@ -131,7 +132,7 @@ static const struct xpad_device {
>         { 0x045e, 0x02e3, "Microsoft X-Box One Elite pad", 0,
> XTYPE_XBOXONE },
>         { 0x045e, 0x02ea, "Microsoft X-Box One S pad", 0,
> XTYPE_XBOXONE },
>         { 0x045e, 0x0719, "Xbox 360 Wireless Receiver",
> MAP_DPAD_TO_BUTTONS, XTYPE_XBOX360W },
> -       { 0x045e, 0x0b0a, "Microsoft X-Box Adaptive Controller", 0,
> XTYPE_XBOXONE },
> +       { 0x045e, 0x0b0a, "Microsoft X-Box Adaptive Controller",
> MAP_LAYER_BUTTON, XTYPE_XBOXONE },
>         { 0x045e, 0x0b12, "Microsoft Xbox Series S|X Controller",
> MAP_SELECT_BUTTON, XTYPE_XBOXONE },
>         { 0x046d, 0xc21d, "Logitech Gamepad F310", 0, XTYPE_XBOX360
> },
>         { 0x046d, 0xc21e, "Logitech Gamepad F510", 0, XTYPE_XBOX360
> },
> @@ -927,6 +928,10 @@ static void xpadone_process_packet(struct
> usb_xpad *xpad, u16 cmd, unsigned char
>                                  (__u16) le16_to_cpup((__le16 *)(data
> + 8)));
>         }
>  
> +       /* Layer button has a value of 0-4, so it is reported as an
> axis */
> +       if (xpad->mapping & MAP_LAYER_BUTTON)
> +               input_report_abs(dev, ABS_MISC, data[34]);
> +
>         input_sync(dev);
>  }
>  
> @@ -1623,6 +1628,9 @@ static void xpad_set_up_abs(struct input_dev
> *input_dev, signed short abs)
>         case ABS_HAT0Y: /* the d-pad (only if dpad is mapped to axes
> */
>                 input_set_abs_params(input_dev, abs, -1, 1, 0, 0);
>                 break;
> +       case ABS_MISC: /* 4 value layer button (such as on XAC) */
> +               input_set_abs_params(input_dev, abs, 0, 4, 0, 0);
> +               break;
>         default:
>                 input_set_abs_params(input_dev, abs, 0, 0, 0, 0);
>                 break;
> @@ -1715,6 +1723,10 @@ static int xpad_init_input(struct usb_xpad
> *xpad)
>                         xpad_set_up_abs(input_dev,
> xpad_abs_triggers[i]);
>         }
>  
> +       /* setup layer button as an axis with 4 possible values */
> +       if (xpad->mapping & MAP_LAYER_BUTTON)
> +               xpad_set_up_abs(input_dev, ABS_MISC);
> +
>         error = xpad_init_ff(xpad);
>         if (error)
>                 goto err_free_input;

Re: [PATCH v3 3/3] Input: joystick: xpad: Add X-Box Adaptive Controller XBox button

[Bastien Nocera]

On Sat, 2022-08-13 at 11:53 -0700, Nate Yocom wrote:
> Adaptive controller sets 0x02 bit for this button, all others set
> 0x01
> so presence of either is used for BTN_MODE.
> 
> Signed-off-by: Nate Yocom <nate@yocom.org>

Tested-by: Bastien Nocera <hadess@hadess.net>

> ---
>  drivers/input/joystick/xpad.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/input/joystick/xpad.c
> b/drivers/input/joystick/xpad.c
> index 83a4f4d07af5..bea71721b6cd 100644
> --- a/drivers/input/joystick/xpad.c
> +++ b/drivers/input/joystick/xpad.c
> @@ -859,7 +859,7 @@ static void xpadone_process_packet(struct
> usb_xpad *xpad, u16 cmd, unsigned char
>                 if (data[1] == 0x30)
>                         xpadone_ack_mode_report(xpad, data[2]);
>  
> -               input_report_key(dev, BTN_MODE, data[4] & 0x01);
> +               input_report_key(dev, BTN_MODE, data[4] & 0x03);
>                 input_sync(dev);
>                 return;
>         }

Re: [PATCH v3 1/3] Input: joystick: xpad: Add X-Box Adaptive Controller support

[Nate Yocom]

On Wed, Aug 17, 2022 at 12:37:02PM +0200, Bastien Nocera wrote:
> On Sat, 2022-08-13 at 11:53 -0700, Nate Yocom wrote:
> > Adds correct VID/PID for this XTYPE_XBOXONE compatible controller to
> > xpad_device[] table.
> > 
> > Signed-off-by: Nate Yocom <nate@yocom.org>
> 
> Have you tested the device in Bluetooth mode? My controller's battery
> is still charging.

I have tried, but haven't been successful in getting it connected with,
or without my changes (i.e. no change), so was focused on cabled support
first.

> Tested-by: Bastien Nocera <hadess@hadess.net>

Thanks!

> 
> > ---
> >  drivers/input/joystick/xpad.c | 1 +
> >  1 file changed, 1 insertion(+)
> > 
> > diff --git a/drivers/input/joystick/xpad.c
> > b/drivers/input/joystick/xpad.c
> > index 18190b529bca..c8b38bb73d34 100644
> > --- a/drivers/input/joystick/xpad.c
> > +++ b/drivers/input/joystick/xpad.c
> > @@ -131,6 +131,7 @@ static const struct xpad_device {
> >         { 0x045e, 0x02e3, "Microsoft X-Box One Elite pad", 0,
> > XTYPE_XBOXONE },
> >         { 0x045e, 0x02ea, "Microsoft X-Box One S pad", 0,
> > XTYPE_XBOXONE },
> >         { 0x045e, 0x0719, "Xbox 360 Wireless Receiver",
> > MAP_DPAD_TO_BUTTONS, XTYPE_XBOX360W },
> > +       { 0x045e, 0x0b0a, "Microsoft X-Box Adaptive Controller", 0,
> > XTYPE_XBOXONE },
> >         { 0x045e, 0x0b12, "Microsoft Xbox Series S|X Controller",
> > MAP_SELECT_BUTTON, XTYPE_XBOXONE },
> >         { 0x046d, 0xc21d, "Logitech Gamepad F310", 0, XTYPE_XBOX360
> > },
> >         { 0x046d, 0xc21e, "Logitech Gamepad F510", 0, XTYPE_XBOX360
> > },
> 

Re: [PATCH v3 2/3] Input: joystick: xpad: Add X-Box Adaptive Controller Layer button

[Nate Yocom]

On Wed, Aug 17, 2022 at 12:37:25PM +0200, Bastien Nocera wrote:
> On Sat, 2022-08-13 at 11:53 -0700, Nate Yocom wrote:
> > Adds a new quirk for controllers that have a Layer button which has 4
> > states, reflected as an ABS_MISC axis with 4 values.
> 
> It's called the "Profile Button" in the official documentation:
> https://support.xbox.com/en-US/help/account-profile/accessibility/get-to-know-adaptive-controller
> so best to call it that.

Agreed - thanks for the pointer, will send a v4 shortly.

> I wonder we have any other examples of profile handling in input
> drivers. The xpadneo driver implements the profiles in the kernel
> driver directly.
> 
> Benjamin?
> 
> Tested-by: Bastien Nocera <hadess@hadess.net>
> 
> > 
> > Signed-off-by: Nate Yocom <nate@yocom.org>
> > ---
> >  drivers/input/joystick/xpad.c | 14 +++++++++++++-
> >  1 file changed, 13 insertions(+), 1 deletion(-)
> > 
> > diff --git a/drivers/input/joystick/xpad.c
> > b/drivers/input/joystick/xpad.c
> > index c8b38bb73d34..83a4f4d07af5 100644
> > --- a/drivers/input/joystick/xpad.c
> > +++ b/drivers/input/joystick/xpad.c
> > @@ -80,6 +80,7 @@
> >  #define MAP_TRIGGERS_TO_BUTTONS                (1 << 1)
> >  #define MAP_STICKS_TO_NULL             (1 << 2)
> >  #define MAP_SELECT_BUTTON              (1 << 3)
> > +#define MAP_LAYER_BUTTON               (1 << 4)
> >  #define DANCEPAD_MAP_CONFIG    (MAP_DPAD_TO_BUTTONS
> > |                  \
> >                                 MAP_TRIGGERS_TO_BUTTONS |
> > MAP_STICKS_TO_NULL)
> >  
> > @@ -131,7 +132,7 @@ static const struct xpad_device {
> >         { 0x045e, 0x02e3, "Microsoft X-Box One Elite pad", 0,
> > XTYPE_XBOXONE },
> >         { 0x045e, 0x02ea, "Microsoft X-Box One S pad", 0,
> > XTYPE_XBOXONE },
> >         { 0x045e, 0x0719, "Xbox 360 Wireless Receiver",
> > MAP_DPAD_TO_BUTTONS, XTYPE_XBOX360W },
> > -       { 0x045e, 0x0b0a, "Microsoft X-Box Adaptive Controller", 0,
> > XTYPE_XBOXONE },
> > +       { 0x045e, 0x0b0a, "Microsoft X-Box Adaptive Controller",
> > MAP_LAYER_BUTTON, XTYPE_XBOXONE },
> >         { 0x045e, 0x0b12, "Microsoft Xbox Series S|X Controller",
> > MAP_SELECT_BUTTON, XTYPE_XBOXONE },
> >         { 0x046d, 0xc21d, "Logitech Gamepad F310", 0, XTYPE_XBOX360
> > },
> >         { 0x046d, 0xc21e, "Logitech Gamepad F510", 0, XTYPE_XBOX360
> > },
> > @@ -927,6 +928,10 @@ static void xpadone_process_packet(struct
> > usb_xpad *xpad, u16 cmd, unsigned char
> >                                  (__u16) le16_to_cpup((__le16 *)(data
> > + 8)));
> >         }
> >  
> > +       /* Layer button has a value of 0-4, so it is reported as an
> > axis */
> > +       if (xpad->mapping & MAP_LAYER_BUTTON)
> > +               input_report_abs(dev, ABS_MISC, data[34]);
> > +
> >         input_sync(dev);
> >  }
> >  
> > @@ -1623,6 +1628,9 @@ static void xpad_set_up_abs(struct input_dev
> > *input_dev, signed short abs)
> >         case ABS_HAT0Y: /* the d-pad (only if dpad is mapped to axes
> > */
> >                 input_set_abs_params(input_dev, abs, -1, 1, 0, 0);
> >                 break;
> > +       case ABS_MISC: /* 4 value layer button (such as on XAC) */
> > +               input_set_abs_params(input_dev, abs, 0, 4, 0, 0);
> > +               break;
> >         default:
> >                 input_set_abs_params(input_dev, abs, 0, 0, 0, 0);
> >                 break;
> > @@ -1715,6 +1723,10 @@ static int xpad_init_input(struct usb_xpad
> > *xpad)
> >                         xpad_set_up_abs(input_dev,
> > xpad_abs_triggers[i]);
> >         }
> >  
> > +       /* setup layer button as an axis with 4 possible values */
> > +       if (xpad->mapping & MAP_LAYER_BUTTON)
> > +               xpad_set_up_abs(input_dev, ABS_MISC);
> > +
> >         error = xpad_init_ff(xpad);
> >         if (error)
> >                 goto err_free_input;
> 

Re: [PATCH v3 2/3] Input: joystick: xpad: Add X-Box Adaptive Controller Layer button

[Bastien Nocera]

On Wed, 2022-08-17 at 12:37 +0200, Bastien Nocera wrote:
> On Sat, 2022-08-13 at 11:53 -0700, Nate Yocom wrote:
> > Adds a new quirk for controllers that have a Layer button which has
> > 4
> > states, reflected as an ABS_MISC axis with 4 values.
> 
> It's called the "Profile Button" in the official documentation:
> https://support.xbox.com/en-US/help/account-profile/accessibility/get-to-know-adaptive-controller
> so best to call it that.
> 
> I wonder we have any other examples of profile handling in input
> drivers. The xpadneo driver implements the profiles in the kernel
> driver directly.
> 
> Benjamin?

After speaking to Benjamin, it was clear that ABS_MISC wasn't the right
absolute axis to use.

I think that adding a new ABS_* axes in include/uapi/linux/input-event-
codes.h would be the best, for example ABS_PROFILE as 0x21.

Dmitry, what do you think?

The idea here is to encode a hardware controlled switch that has 4
possible values. Its state will be sent with every input event in order
for user-space to (maybe) apply a specific profile to the events.

This would also be used by the XBox Elite 2 controller driver.

Cheers

Re: [PATCH v3 2/3] Input: joystick: xpad: Add X-Box Adaptive Controller Layer button

[Nate Yocom]

On Wed, Aug 24, 2022 at 05:36:30PM +0200, Bastien Nocera wrote:
> On Wed, 2022-08-17 at 12:37 +0200, Bastien Nocera wrote:
> > On Sat, 2022-08-13 at 11:53 -0700, Nate Yocom wrote:
> > > Adds a new quirk for controllers that have a Layer button which has
> > > 4
> > > states, reflected as an ABS_MISC axis with 4 values.
> > 
> > It's called the "Profile Button" in the official documentation:
> > https://support.xbox.com/en-US/help/account-profile/accessibility/get-to-know-adaptive-controller
> > so best to call it that.
> > 
> > I wonder we have any other examples of profile handling in input
> > drivers. The xpadneo driver implements the profiles in the kernel
> > driver directly.
> > 
> > Benjamin?
> 
> After speaking to Benjamin, it was clear that ABS_MISC wasn't the right
> absolute axis to use.
> 
> I think that adding a new ABS_* axes in include/uapi/linux/input-event-
> codes.h would be the best, for example ABS_PROFILE as 0x21.

Makes sense to me. 

> Dmitry, what do you think?

I'll submit a v5 with ABS_PROFILE defined jic.

> 
> The idea here is to encode a hardware controlled switch that has 4
> possible values. Its state will be sent with every input event in order
> for user-space to (maybe) apply a specific profile to the events.
> 
> This would also be used by the XBox Elite 2 controller driver.
> 
> Cheers