docs: Add initial pointer docs.

Co-authored-by: Anant Thazhemadam <[email protected]> Co-authored-by: Erik Tollerud <[email protected]>
petejohanson · Dec 2, 2024 · e28a83d · e28a83d
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diff --git a/docs/docs/config/pointers.md b/docs/docs/config/pointers.md
@@ -0,0 +1,67 @@
+---
+title: Pointer Configuration
+sidebar_label: Pointers
+---
+
+These are settings related to the pointer/mouse support in ZMK.
+
+See [Configuration Overview](index.md) for instructions on how to change these settings.
+
+## Kconfig
+
+Definition file: [zmk/app/mouse/Kconfig](https://github.com/zmkfirmware/zmk/blob/main/app/mouse/Kconfig)
+
+### General
+
+| Config                              | Type | Description                                                                | Default |
+| ----------------------------------- | ---- | -------------------------------------------------------------------------- | ------- |
+| `CONFIG_ZMK_MOUSE`                  | bool | Enable the general pointer/mouse functionality                             | n       |
+| `CONFIG_ZMK_MOUSE_SMOOTH_SCROLLING` | bool | Enable smooth scrolling HID functionality (via HID Resolution Multipliers) | n       |
+
+### Zephyr Settings
+
+The following settings are from Zephyr, and should be defaulted to sane values, but can be adjusted if you encounter problems
+
+| Config                           | Type | Description                                                | Default                         |
+| -------------------------------- | ---- | ---------------------------------------------------------- | ------------------------------- |
+| `CONFIG_INPUT_THREAD_STACK_SIZE` | int  | Stack size for the dedicated input event processing thread | 512 (1024 on split peripherals) |
+
+## Input Listener
+
+TODO: Complete description
+
+### Devicetree
+
+Applies to: `compatible = "zmk,input-listener"`
+
+Definition file: [zmk/app/dts/bindings/zmk,input-listener.yaml](https://github.com/zmkfirmware/zmk/blob/main/app/dts/bindings/zmk%2Cinput-listener.yaml)
+
+| Property           | Type   | Description                                                         | Default |
+| ------------------ | ------ | ------------------------------------------------------------------- | ------- |
+| `device`           | handle | Input device handle                                                 |         |
+| `input-processors` | array  | List of input processors (with parameters) to apply to input events |         |
+
+#### Child Properties
+
+Additional properties can be set on child nodes, which allows changing the settings when certain layers are enabled:
+
+| Property           | Type  | Description                                                                                      | Default |
+| ------------------ | ----- | ------------------------------------------------------------------------------------------------ | ------- |
+| `layers`           | array | List of layer indexes. This config will apply if any layer in the list is active.                |         |
+| `input-processors` | array | List of input processors (with parameters) to apply to input events                              |         |
+| `inherit`          | flag  | Whether to first apply the base input processors before the processors specific to this override |         |
+
+## Input Split
+
+TODO: Complete description
+
+### Devicetree
+
+Applies to: `compatible = "zmk,input-split"`
+
+Definition file: [zmk/app/dts/bindings/zmk,input-split.yaml](https://github.com/zmkfirmware/zmk/blob/main/app/dts/bindings/zmk%2Cinput-split.yaml)
+
+| Property           | Type   | Description                                                         | Default |
+| ------------------ | ------ | ------------------------------------------------------------------- | ------- |
+| `device`           | handle | Input device handle                                                 |         |
+| `input-processors` | array  | List of input processors (with parameters) to apply to input events |         |
diff --git a/docs/docs/development/hardware-integration/pointers.md b/docs/docs/development/hardware-integration/pointers.md
@@ -0,0 +1,130 @@
+---
+title: Pointing Devices
+sidebar_label: Pointers
+---
+
+ZMK's pointer support builds upon the Zephyr [input API](https://docs.zephyrproject.org/3.5.0/services/input/index.html) to offer pointer/mouse functionality with various hardware. A limited number of input drivers are available in the Zephyr 3.5 version currently used by ZMK, but additional drivers can be found in [external modules](../../features/modules.mdx) for a variety of hardware.
+
+## Input Device
+
+The starting point to any integration of a physical pointing device is the device node itself. The specifics of where this node goes will depend on the specific hardware. _Most_ pointing hardware uses either SPI or I2C for communication, and will be nested under a properly configured bus node, e.g. `&pro_micro_i2c` or for a complete onboard setup, `&i2c3`. See the documentation on [pin control](./pinctrl.mdx) if you need to configure the pins for an I2C or SPI bus.
+
+For example, if setting up a device that uses SPI, you may have a node like:
+
+```dts
+&pro_micro_spi {
+    status = "okay";
+    cs-gpios = <&pro_micro 19 GPIO_ACTIVE_LOW>;
+
+    glidepoint: glidepoint@0 {
+        compatible = "cirque,pinnacle";
+        reg = <0>;
+        spi-max-frequency = <1000000>;
+        status = "okay";
+        dr-gpios = <&pro_micro 5 (GPIO_ACTIVE_HIGH)>;
+
+        sensitivity = "4x";
+        sleep;
+        no-taps;
+    };
+};
+```
+
+The specifics of the properties required to set for a given driver will vary; always consult the devicetree bindings file for the specific driver to see what properties can be set.
+
+## Listener
+
+Every input device needs an associated listener added that listens for events from the device and processes them before sending the events to the host using a HID mouse report. See [input listener configuration](../../config/pointers.md#input-listener) for the full details. For example, to add a listener for the above device:
+
+```dts
+/ {
+    glidepoint_listener {
+        compatible = "zmk,input-listener";
+        device = <&glidepoint>;
+    };
+};
+```
+
+## Input Processors
+
+Some physical pointing devices may be generating input events that need some adjustment before being sent to hosts. For example a trackpad might be integrated into a keyboard rotated 90° and need the X/Y data adjusted appropriately. This can be accomplished with [input processors](../../keymaps/input-processors/index.md). You could enhande the above listener with:
+
+```dts
+#include <dt-bindings/zmk/input_transform.h>
+
+/ {
+    glidepoint_listener {
+        compatible = "zmk,input-listener";
+        device = <&glidepoint>;
+        input-processors = <&zip_xy_transform (INPUT_TRANSFORM_XY_SWAP | INPUT_TRANSFORM_X_INVERT | INPUT_TRANSFORM_Y_INVERT)>;
+    };
+};
+```
+
+## Split
+
+Pointing devices are supported on split peripherals, with some additional configuration using the [input split](../../config/pointers.md#input-split). All split pointers are identified using a unique integer value, which is specified using the `reg` property and in the `@#` suffix for the node. If adding multiple peripheral pointers, be sure that each is given a unique identifier.
+
+### Shared
+
+Both peripheral and central make use of a `zmk,input-split` device, which functions differently depending on where it is used. To avoid duplicating work, this node can be defined in a common `.dtsi` file that is included into both central and peripheral `.overlay`/`.dts` files. Second, the input listener for the central side is added here, but disabled, so that keymaps (which are included for central and peripheral builds) can reference the listener to add input processors without issue.
+
+:::note
+
+Input splits need to be nested under a parent node that properly sets the `#address-cells` and `#size-cells` values appropriately. These settings are what allow us to use a single integer number for the `reg` value.
+
+:::
+
+```dts
+/ {
+    split_inputs {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        glidepoint_split: glidepoint_split@0 {
+            compatible = "zmk,input-split";
+            reg = <0>;
+        };
+    };
+
+    glidepoint_listener: glidepoint_listener {
+        compatible = "zmk,input-listener";
+        status = "disabled";
+        device = <&glidepoint_split>;
+    };
+};
+```
+
+### Peripheral
+
+On the peripheral, first include the shared file, and then update the input split to reference the pointer device that should be proxied:
+
+```dts
+#include "common.dtsi"
+
+&glidepoint_split {
+    device = <&glidepoint>;
+};
+```
+
+If needed, the split can also have basic input processors applied to fix up the input data before it is sent to the central:
+
+```dts
+&glidepoint_split {
+    device = <&glidepoint>;
+
+    input-processors = <&zip_xy_transform (INPUT_TRANSFORM_XY_SWAP | INPUT_TRANSFORM_X_INVERT | INPUT_TRANSFORM_Y_INVERT)>;
+};
+```
+
+### Central
+
+On the central, the input split acts as an input device, receiving events from the peripheral and raising them locally. First, include the shared file, and then enabled the [input listener](#listener) that is created, but disabled, in our shared file:
+
+```dts
+#include "common.dtsi"
+
+&glidepoint_listener {
+    status = "okay";
+};
+```
diff --git a/docs/docs/features/pointers.md b/docs/docs/features/pointers.md
@@ -0,0 +1,39 @@
+---
+title: Pointers
+---
+
+ZMK supports physical pointing devices, as well as [mouse emulation behaviors](../keymaps/behaviors/mouse-emulation.md) for sending HID pointing events to hosts.
+
+## Configuration
+
+To enable the pointer functionality, you must set `CONFIG_ZMK_MOUSE=y` in your config. See the [pointer configuration](../config/pointers.md) for the full details.
+
+:::warning
+
+When enabling the feature, changes are made to the HID report descriptor, which may not get picked up automatically over BLE to some hosts. Be sure to remove and re-pair to your hosts once you enable the feature
+
+:::
+
+## Mouse Emulation
+
+Mouse emulation allows you to use your keyboard as a pointing device without using dedicated pointer hardware, like an integrated trackpad, trackball, etc. By adding new bindings in your keymap like `&mmv MOVE_UP` you can make key presses send mouse HID events to your connected hosts.
+
+See the [mouse emulation behaviors](../keymaps/behaviors/mouse-emulation.md) for details.
+
+## Physical Pointers
+
+There are a few drivers available for supported physical pointing devices integrated into ZMK powered device. When doing so, you can use your device as both a keyboard and a pointing device with any connected hosts. The functionality can be extended further, e.g. slow mode, scroll mode, temporary mouse layers, etc. by configuring input processors linked to the physical pointing device.
+
+For more information, refer to the [pointer hardware integration](../development/hardware-integration/pointers.md) documentation.
+
+## Input Processors
+
+Input processors are small pieces of functionality that process and optionally modify events generated from emulated and physical pointing devices. Processors can do things like scaling movement values to make them larger or smaller for detailed work, swapping the event types to turn movements into scroll events, or temporarily enabling an extra layer while the pointer is in use.
+
+For more details, see the [input processors](../keymaps/input-processors/index.md) section of the keymap documentation.
+
+## Input Listeners
+
+Listeners are the key piece that integrate the low level input devices to the rest of the ZMK system. In particular, listeners subscribe to input events from the linked device, and when a given event occurs (e.g. X/Y movement), apply any input processors before sending those events to the HID system for notification to the host. The main way to modify the way a pointer behaves is by configuring the input processors for a given listener.
+
+For more details on assigning processors to your listeners, see the [input processor usage](../keymaps/input-processors/usage.md) documentation.
diff --git a/docs/docs/keymaps/behaviors/mouse-emulation.md b/docs/docs/keymaps/behaviors/mouse-emulation.md
@@ -67,6 +67,16 @@ This example will send press of the fourth mouse button when the binding is trig
 &mkp MB4
 ```
 
+### Input Processors
+
+If you want to apply any [input processors](../input-processors/index.md#input-processors-overview) to `&mkp` you can do so by referencing `&mkp_input_listener`, e.g.:
+
+```dts
+&mkp_input_listener {
+    input-processors = <&zip_temp_layer 2 2000>;
+}
+```
+
 ## Mouse Move
 
 This behavior sends mouse X/Y movement events to the connected host.
@@ -99,6 +109,16 @@ The following will send a left mouse movement event to the host when pressed/hel
 &mmv MOVE_LEFT
 ```
 
+### Input Processors
+
+If you want to apply any [input processors](../input-processors/index.md#input-processors-overview) to `&mmv` you can do so by referencing `&mmv_input_listener`, e.g.:
+
+```dts
+&mmv_input_listener {
+    input-processors = <&zip_temp_layer 2 2000>;
+}
+```
+
 ## Mouse Scroll
 
 This behavior sends vertical and horizontal scroll events to the connected host.
@@ -110,23 +130,69 @@ This behavior sends vertical and horizontal scroll events to the connected host.
 
 The following defines can be passed for the parameter:
 
-| Define       | Action     |
-| :----------- | :--------- |
-| `MOVE_UP`    | Move up    |
-| `MOVE_DOWN`  | Move down  |
-| `MOVE_LEFT`  | Move left  |
-| `MOVE_RIGHT` | Move right |
+| Define       | Action       |
+| :----------- | :----------- |
+| `SCRL_UP`    | Scroll up    |
+| `SCRL_DOWN`  | Scroll down  |
+| `SCRL_LEFT`  | Scroll left  |
+| `SCRL_RIGHT` | Scroll right |
 
 ### Examples
 
 The following will send a scroll down event to the host when pressed/held:
 
 ```
-&msc MOVE_DOWN
+&msc SCRL_DOWN
 ```
 
 The following will send a scroll left event to the host when pressed/held:
 
 ```
-&msc MOVE_LEFT
+&msc SCRL_LEFT
 ```
+
+:::note
+
+If you enabled [smooth scrolling](../../config/pointers.md#kconfig) then you will want to use the same `MOVE_UP`, `MOVE_DOWN`, etc values instead of the smaller `SCRL_*` parameters.
+
+:::
+
+### Input Processors
+
+If you want to apply any [input processors](../input-processors/index.md#input-processors-overview) to `&msc` you can do so by referencing `&msc_input_listener`, e.g.:
+
+```dts
+&msc_input_listener {
+    input-processors = <&zip_temp_layer 2 2000>;
+}
+```
+
+### Advanced Configuration
+
+Both `&mmv` and `&msc` are instances of the same `"zmk,behavior-input-two-axis"` behavior. As such, the following settings can be applied to either behavior, e.g.:
+
+```dts
+&mmv {
+    trigger-period-ms = <12>
+};
+```
+
+#### `trigger-period-ms`
+
+How many milliseconds between generated input events based on the current speed/direction.
+
+#### `delay-ms`
+
+How many milliseconds to delay any processing or event generation when first pressed.
+
+#### `time-to-max-speed-ms`
+
+How many milliseconds it takes to accelerate to the curren max speed.
+
+#### `acceleration-exponent`
+
+The acceleration exponent to apply, with three possible values:
+
+- `0` - uniform speed
+- `1` - uniform acceleration
+- `2` - exponential acceleration