diff --git a/libs/input/Android.bp b/libs/input/Android.bp
index 8f44b3a..4123ffc 100644
--- a/libs/input/Android.bp
+++ b/libs/input/Android.bp
@@ -117,6 +117,27 @@
         "--allowlist-var=AINPUT_SOURCE_HDMI",
         "--allowlist-var=AINPUT_SOURCE_SENSOR",
         "--allowlist-var=AINPUT_SOURCE_ROTARY_ENCODER",
+        "--allowlist-var=AINPUT_KEYBOARD_TYPE_NONE",
+        "--allowlist-var=AINPUT_KEYBOARD_TYPE_NON_ALPHABETIC",
+        "--allowlist-var=AINPUT_KEYBOARD_TYPE_ALPHABETIC",
+        "--allowlist-var=AMETA_NONE",
+        "--allowlist-var=AMETA_ALT_ON",
+        "--allowlist-var=AMETA_ALT_LEFT_ON",
+        "--allowlist-var=AMETA_ALT_RIGHT_ON",
+        "--allowlist-var=AMETA_SHIFT_ON",
+        "--allowlist-var=AMETA_SHIFT_LEFT_ON",
+        "--allowlist-var=AMETA_SHIFT_RIGHT_ON",
+        "--allowlist-var=AMETA_SYM_ON",
+        "--allowlist-var=AMETA_FUNCTION_ON",
+        "--allowlist-var=AMETA_CTRL_ON",
+        "--allowlist-var=AMETA_CTRL_LEFT_ON",
+        "--allowlist-var=AMETA_CTRL_RIGHT_ON",
+        "--allowlist-var=AMETA_META_ON",
+        "--allowlist-var=AMETA_META_LEFT_ON",
+        "--allowlist-var=AMETA_META_RIGHT_ON",
+        "--allowlist-var=AMETA_CAPS_LOCK_ON",
+        "--allowlist-var=AMETA_NUM_LOCK_ON",
+        "--allowlist-var=AMETA_SCROLL_LOCK_ON",
     ],
 
     static_libs: [
@@ -208,6 +229,7 @@
         "InputVerifier.cpp",
         "Keyboard.cpp",
         "KeyCharacterMap.cpp",
+        "KeyboardClassifier.cpp",
         "KeyLayoutMap.cpp",
         "MotionPredictor.cpp",
         "MotionPredictorMetricsManager.cpp",
diff --git a/libs/input/InputDevice.cpp b/libs/input/InputDevice.cpp
index bc67810..9333ab8 100644
--- a/libs/input/InputDevice.cpp
+++ b/libs/input/InputDevice.cpp
@@ -273,10 +273,7 @@
 }
 
 void InputDeviceInfo::setKeyboardType(int32_t keyboardType) {
-    static_assert(AINPUT_KEYBOARD_TYPE_NONE < AINPUT_KEYBOARD_TYPE_NON_ALPHABETIC);
-    static_assert(AINPUT_KEYBOARD_TYPE_NON_ALPHABETIC < AINPUT_KEYBOARD_TYPE_ALPHABETIC);
-    // There can be multiple subdevices with different keyboard types, set it to the highest type
-    mKeyboardType = std::max(mKeyboardType, keyboardType);
+    mKeyboardType = keyboardType;
 }
 
 void InputDeviceInfo::setKeyboardLayoutInfo(KeyboardLayoutInfo layoutInfo) {
diff --git a/libs/input/KeyboardClassifier.cpp b/libs/input/KeyboardClassifier.cpp
new file mode 100644
index 0000000..0c2c7be
--- /dev/null
+++ b/libs/input/KeyboardClassifier.cpp
@@ -0,0 +1,89 @@
+/*
+ * Copyright 2024 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#define LOG_TAG "KeyboardClassifier"
+
+#include <android-base/logging.h>
+#include <com_android_input_flags.h>
+#include <ftl/flags.h>
+#include <input/KeyboardClassifier.h>
+
+#include "input_cxx_bridge.rs.h"
+
+namespace input_flags = com::android::input::flags;
+
+using android::input::RustInputDeviceIdentifier;
+
+namespace android {
+
+KeyboardClassifier::KeyboardClassifier() {
+    if (input_flags::enable_keyboard_classifier()) {
+        mRustClassifier = android::input::keyboardClassifier::create();
+    }
+}
+
+KeyboardType KeyboardClassifier::getKeyboardType(DeviceId deviceId) {
+    if (mRustClassifier) {
+        return static_cast<KeyboardType>(
+                android::input::keyboardClassifier::getKeyboardType(**mRustClassifier, deviceId));
+    } else {
+        auto it = mKeyboardTypeMap.find(deviceId);
+        if (it == mKeyboardTypeMap.end()) {
+            return KeyboardType::NONE;
+        }
+        return it->second;
+    }
+}
+
+// Copied from EventHub.h
+const uint32_t DEVICE_CLASS_KEYBOARD = android::os::IInputConstants::DEVICE_CLASS_KEYBOARD;
+const uint32_t DEVICE_CLASS_ALPHAKEY = android::os::IInputConstants::DEVICE_CLASS_ALPHAKEY;
+
+void KeyboardClassifier::notifyKeyboardChanged(DeviceId deviceId,
+                                               const InputDeviceIdentifier& identifier,
+                                               uint32_t deviceClasses) {
+    if (mRustClassifier) {
+        RustInputDeviceIdentifier rustIdentifier;
+        rustIdentifier.name = identifier.name;
+        rustIdentifier.location = identifier.location;
+        rustIdentifier.unique_id = identifier.uniqueId;
+        rustIdentifier.bus = identifier.bus;
+        rustIdentifier.vendor = identifier.vendor;
+        rustIdentifier.product = identifier.product;
+        rustIdentifier.version = identifier.version;
+        rustIdentifier.descriptor = identifier.descriptor;
+        android::input::keyboardClassifier::notifyKeyboardChanged(**mRustClassifier, deviceId,
+                                                                  rustIdentifier, deviceClasses);
+    } else {
+        bool isKeyboard = (deviceClasses & DEVICE_CLASS_KEYBOARD) != 0;
+        bool hasAlphabeticKey = (deviceClasses & DEVICE_CLASS_ALPHAKEY) != 0;
+        mKeyboardTypeMap.insert_or_assign(deviceId,
+                                          isKeyboard ? (hasAlphabeticKey
+                                                                ? KeyboardType::ALPHABETIC
+                                                                : KeyboardType::NON_ALPHABETIC)
+                                                     : KeyboardType::NONE);
+    }
+}
+
+void KeyboardClassifier::processKey(DeviceId deviceId, int32_t evdevCode, uint32_t metaState) {
+    if (mRustClassifier &&
+        !android::input::keyboardClassifier::isFinalized(**mRustClassifier, deviceId)) {
+        android::input::keyboardClassifier::processKey(**mRustClassifier, deviceId, evdevCode,
+                                                       metaState);
+    }
+}
+
+} // namespace android
diff --git a/libs/input/android/os/IInputConstants.aidl b/libs/input/android/os/IInputConstants.aidl
index 90ed2b7..e8746d0 100644
--- a/libs/input/android/os/IInputConstants.aidl
+++ b/libs/input/android/os/IInputConstants.aidl
@@ -234,4 +234,157 @@
      * time to adjust to changes in direction.
      */
     const int VELOCITY_TRACKER_STRATEGY_LEGACY = 9;
+
+
+    /*
+     * Input device class: Keyboard
+     * The input device is a keyboard or has buttons.
+     *
+     * @hide
+     */
+    const int DEVICE_CLASS_KEYBOARD = 0x00000001;
+
+    /*
+     * Input device class: Alphakey
+     * The input device is an alpha-numeric keyboard (not just a dial pad).
+     *
+     * @hide
+     */
+    const int DEVICE_CLASS_ALPHAKEY = 0x00000002;
+
+    /*
+     * Input device class: Touch
+     * The input device is a touchscreen or a touchpad (either single-touch or multi-touch).
+     *
+     * @hide
+     */
+    const int DEVICE_CLASS_TOUCH = 0x00000004;
+
+    /*
+     * Input device class: Cursor
+     * The input device is a cursor device such as a trackball or mouse.
+     *
+     * @hide
+     */
+    const int DEVICE_CLASS_CURSOR = 0x00000008;
+
+    /*
+     * Input device class: Multi-touch
+     * The input device is a multi-touch touchscreen or touchpad.
+     *
+     * @hide
+     */
+    const int DEVICE_CLASS_TOUCH_MT = 0x00000010;
+
+    /*
+     * Input device class: Dpad
+     * The input device is a directional pad (implies keyboard, has DPAD keys).
+     *
+     * @hide
+     */
+    const int DEVICE_CLASS_DPAD = 0x00000020;
+
+    /*
+     * Input device class: Gamepad
+     * The input device is a gamepad (implies keyboard, has BUTTON keys).
+     *
+     * @hide
+     */
+    const int DEVICE_CLASS_GAMEPAD = 0x00000040;
+
+    /*
+     * Input device class: Switch
+     * The input device has switches.
+     *
+     * @hide
+     */
+    const int DEVICE_CLASS_SWITCH = 0x00000080;
+
+    /*
+     * Input device class: Joystick
+     * The input device is a joystick (implies gamepad, has joystick absolute axes).
+     *
+     * @hide
+     */
+    const int DEVICE_CLASS_JOYSTICK = 0x00000100;
+
+    /*
+     * Input device class: Vibrator
+     * The input device has a vibrator (supports FF_RUMBLE).
+     *
+     * @hide
+     */
+    const int DEVICE_CLASS_VIBRATOR = 0x00000200;
+
+    /*
+     * Input device class: Mic
+     * The input device has a microphone.
+     *
+     * @hide
+     */
+    const int DEVICE_CLASS_MIC = 0x00000400;
+
+    /*
+     * Input device class: External Stylus
+     * The input device is an external stylus (has data we want to fuse with touch data).
+     *
+     * @hide
+     */
+    const int DEVICE_CLASS_EXTERNAL_STYLUS = 0x00000800;
+
+    /*
+     * Input device class: Rotary Encoder
+     * The input device has a rotary encoder.
+     *
+     * @hide
+     */
+    const int DEVICE_CLASS_ROTARY_ENCODER = 0x00001000;
+
+    /*
+     * Input device class: Sensor
+     * The input device has a sensor like accelerometer, gyro, etc.
+     *
+     * @hide
+     */
+    const int DEVICE_CLASS_SENSOR = 0x00002000;
+
+    /*
+     * Input device class: Battery
+     * The input device has a battery.
+     *
+     * @hide
+     */
+    const int DEVICE_CLASS_BATTERY = 0x00004000;
+
+    /*
+     * Input device class: Light
+     * The input device has sysfs controllable lights.
+     *
+     * @hide
+     */
+    const int DEVICE_CLASS_LIGHT = 0x00008000;
+
+    /*
+     * Input device class: Touchpad
+     * The input device is a touchpad, requiring an on-screen cursor.
+     *
+     * @hide
+     */
+    const int DEVICE_CLASS_TOUCHPAD = 0x00010000;
+
+    /*
+     * Input device class: Virtual
+     * The input device is virtual (not a real device, not part of UI configuration).
+     *
+     * @hide
+     */
+    const int DEVICE_CLASS_VIRTUAL = 0x20000000;
+
+    /*
+     * Input device class: External
+     * The input device is external (not built-in).
+     *
+     * @hide
+     */
+    const int DEVICE_CLASS_EXTERNAL = 0x40000000;
 }
diff --git a/libs/input/input_flags.aconfig b/libs/input/input_flags.aconfig
index 560166c..a2192cb 100644
--- a/libs/input/input_flags.aconfig
+++ b/libs/input/input_flags.aconfig
@@ -150,3 +150,10 @@
   description: "Hide touch and pointer indicators if a secure window is present on display"
   bug: "325252005"
 }
+
+flag {
+  name: "enable_keyboard_classifier"
+  namespace: "input"
+  description: "Keyboard classifier that classifies all keyboards into alphabetic or non-alphabetic"
+  bug: "263559234"
+}
diff --git a/libs/input/rust/input.rs b/libs/input/rust/input.rs
index d0dbd6f..72b421c 100644
--- a/libs/input/rust/input.rs
+++ b/libs/input/rust/input.rs
@@ -16,22 +16,26 @@
 
 //! Common definitions of the Android Input Framework in rust.
 
+use crate::ffi::RustInputDeviceIdentifier;
 use bitflags::bitflags;
-use inputconstants::aidl::android::os::IInputConstants::INPUT_EVENT_FLAG_CANCELED;
-use inputconstants::aidl::android::os::IInputConstants::INPUT_EVENT_FLAG_IS_ACCESSIBILITY_EVENT;
-use inputconstants::aidl::android::os::IInputConstants::INPUT_EVENT_FLAG_TAINTED;
-use inputconstants::aidl::android::os::IInputConstants::MOTION_EVENT_FLAG_HOVER_EXIT_PENDING;
-use inputconstants::aidl::android::os::IInputConstants::MOTION_EVENT_FLAG_IS_GENERATED_GESTURE;
-use inputconstants::aidl::android::os::IInputConstants::MOTION_EVENT_FLAG_NO_FOCUS_CHANGE;
-use inputconstants::aidl::android::os::IInputConstants::MOTION_EVENT_FLAG_TARGET_ACCESSIBILITY_FOCUS;
-use inputconstants::aidl::android::os::IInputConstants::MOTION_EVENT_FLAG_WINDOW_IS_OBSCURED;
-use inputconstants::aidl::android::os::IInputConstants::MOTION_EVENT_FLAG_WINDOW_IS_PARTIALLY_OBSCURED;
+use inputconstants::aidl::android::os::IInputConstants;
 use std::fmt;
 
 /// The InputDevice ID.
 #[derive(Debug, Copy, Clone, Eq, PartialEq, Ord, PartialOrd, Hash)]
 pub struct DeviceId(pub i32);
 
+/// The InputDevice equivalent for Rust inputflinger
+#[derive(Debug)]
+pub struct InputDevice {
+    /// InputDevice ID
+    pub device_id: DeviceId,
+    /// InputDevice unique identifier
+    pub identifier: RustInputDeviceIdentifier,
+    /// InputDevice classes (equivalent to EventHub InputDeviceClass)
+    pub classes: DeviceClass,
+}
+
 #[repr(u32)]
 pub enum SourceClass {
     None = input_bindgen::AINPUT_SOURCE_CLASS_NONE,
@@ -192,23 +196,23 @@
     #[derive(Debug)]
     pub struct MotionFlags: u32 {
         /// FLAG_WINDOW_IS_OBSCURED
-        const WINDOW_IS_OBSCURED = MOTION_EVENT_FLAG_WINDOW_IS_OBSCURED as u32;
+        const WINDOW_IS_OBSCURED = IInputConstants::MOTION_EVENT_FLAG_WINDOW_IS_OBSCURED as u32;
         /// FLAG_WINDOW_IS_PARTIALLY_OBSCURED
-        const WINDOW_IS_PARTIALLY_OBSCURED = MOTION_EVENT_FLAG_WINDOW_IS_PARTIALLY_OBSCURED as u32;
+        const WINDOW_IS_PARTIALLY_OBSCURED = IInputConstants::MOTION_EVENT_FLAG_WINDOW_IS_PARTIALLY_OBSCURED as u32;
         /// FLAG_HOVER_EXIT_PENDING
-        const HOVER_EXIT_PENDING = MOTION_EVENT_FLAG_HOVER_EXIT_PENDING as u32;
+        const HOVER_EXIT_PENDING = IInputConstants::MOTION_EVENT_FLAG_HOVER_EXIT_PENDING as u32;
         /// FLAG_IS_GENERATED_GESTURE
-        const IS_GENERATED_GESTURE = MOTION_EVENT_FLAG_IS_GENERATED_GESTURE as u32;
+        const IS_GENERATED_GESTURE = IInputConstants::MOTION_EVENT_FLAG_IS_GENERATED_GESTURE as u32;
         /// FLAG_CANCELED
-        const CANCELED = INPUT_EVENT_FLAG_CANCELED as u32;
+        const CANCELED = IInputConstants::INPUT_EVENT_FLAG_CANCELED as u32;
         /// FLAG_NO_FOCUS_CHANGE
-        const NO_FOCUS_CHANGE = MOTION_EVENT_FLAG_NO_FOCUS_CHANGE as u32;
+        const NO_FOCUS_CHANGE = IInputConstants::MOTION_EVENT_FLAG_NO_FOCUS_CHANGE as u32;
         /// FLAG_IS_ACCESSIBILITY_EVENT
-        const IS_ACCESSIBILITY_EVENT = INPUT_EVENT_FLAG_IS_ACCESSIBILITY_EVENT as u32;
+        const IS_ACCESSIBILITY_EVENT = IInputConstants::INPUT_EVENT_FLAG_IS_ACCESSIBILITY_EVENT as u32;
         /// FLAG_TAINTED
-        const TAINTED = INPUT_EVENT_FLAG_TAINTED as u32;
+        const TAINTED = IInputConstants::INPUT_EVENT_FLAG_TAINTED as u32;
         /// FLAG_TARGET_ACCESSIBILITY_FOCUS
-        const TARGET_ACCESSIBILITY_FOCUS = MOTION_EVENT_FLAG_TARGET_ACCESSIBILITY_FOCUS as u32;
+        const TARGET_ACCESSIBILITY_FOCUS = IInputConstants::MOTION_EVENT_FLAG_TARGET_ACCESSIBILITY_FOCUS as u32;
     }
 }
 
@@ -220,6 +224,107 @@
     }
 }
 
+bitflags! {
+    /// Device class of the input device. These are duplicated from Eventhub.h
+    /// We need to make sure the two version remain in sync when adding new classes.
+    #[derive(Debug, PartialEq)]
+    pub struct DeviceClass: u32 {
+        /// The input device is a keyboard or has buttons
+        const Keyboard = IInputConstants::DEVICE_CLASS_KEYBOARD as u32;
+        /// The input device is an alpha-numeric keyboard (not just a dial pad)
+        const AlphabeticKey = IInputConstants::DEVICE_CLASS_ALPHAKEY as u32;
+        /// The input device is a touchscreen or a touchpad (either single-touch or multi-touch)
+        const Touch = IInputConstants::DEVICE_CLASS_TOUCH as u32;
+        /// The input device is a cursor device such as a trackball or mouse.
+        const Cursor = IInputConstants::DEVICE_CLASS_CURSOR as u32;
+        /// The input device is a multi-touch touchscreen or touchpad.
+        const MultiTouch = IInputConstants::DEVICE_CLASS_TOUCH_MT as u32;
+        /// The input device is a directional pad (implies keyboard, has DPAD keys).
+        const Dpad = IInputConstants::DEVICE_CLASS_DPAD as u32;
+        /// The input device is a gamepad (implies keyboard, has BUTTON keys).
+        const Gamepad = IInputConstants::DEVICE_CLASS_GAMEPAD as u32;
+        /// The input device has switches.
+        const Switch = IInputConstants::DEVICE_CLASS_SWITCH as u32;
+        /// The input device is a joystick (implies gamepad, has joystick absolute axes).
+        const Joystick = IInputConstants::DEVICE_CLASS_JOYSTICK as u32;
+        /// The input device has a vibrator (supports FF_RUMBLE).
+        const Vibrator = IInputConstants::DEVICE_CLASS_VIBRATOR as u32;
+        /// The input device has a microphone.
+        const Mic = IInputConstants::DEVICE_CLASS_MIC as u32;
+        /// The input device is an external stylus (has data we want to fuse with touch data).
+        const ExternalStylus = IInputConstants::DEVICE_CLASS_EXTERNAL_STYLUS as u32;
+        /// The input device has a rotary encoder
+        const RotaryEncoder = IInputConstants::DEVICE_CLASS_ROTARY_ENCODER as u32;
+        /// The input device has a sensor like accelerometer, gyro, etc
+        const Sensor = IInputConstants::DEVICE_CLASS_SENSOR as u32;
+        /// The input device has a battery
+        const Battery = IInputConstants::DEVICE_CLASS_BATTERY as u32;
+        /// The input device has sysfs controllable lights
+        const Light = IInputConstants::DEVICE_CLASS_LIGHT as u32;
+        /// The input device is a touchpad, requiring an on-screen cursor.
+        const Touchpad = IInputConstants::DEVICE_CLASS_TOUCHPAD as u32;
+        /// The input device is virtual (not a real device, not part of UI configuration).
+        const Virtual = IInputConstants::DEVICE_CLASS_VIRTUAL as u32;
+        /// The input device is external (not built-in).
+        const External = IInputConstants::DEVICE_CLASS_EXTERNAL as u32;
+    }
+}
+
+bitflags! {
+    /// Modifier state flags
+    #[derive(Debug, PartialEq)]
+    pub struct ModifierState: u32 {
+        /// No meta keys are pressed
+        const None = input_bindgen::AMETA_NONE;
+        /// This mask is used to check whether one of the ALT meta keys is pressed
+        const AltOn = input_bindgen::AMETA_ALT_ON;
+        /// This mask is used to check whether the left ALT meta key is pressed
+        const AltLeftOn = input_bindgen::AMETA_ALT_LEFT_ON;
+        /// This mask is used to check whether the right ALT meta key is pressed
+        const AltRightOn = input_bindgen::AMETA_ALT_RIGHT_ON;
+        /// This mask is used to check whether one of the SHIFT meta keys is pressed
+        const ShiftOn = input_bindgen::AMETA_SHIFT_ON;
+        /// This mask is used to check whether the left SHIFT meta key is pressed
+        const ShiftLeftOn = input_bindgen::AMETA_SHIFT_LEFT_ON;
+        /// This mask is used to check whether the right SHIFT meta key is pressed
+        const ShiftRightOn = input_bindgen::AMETA_SHIFT_RIGHT_ON;
+        /// This mask is used to check whether the SYM meta key is pressed
+        const SymOn = input_bindgen::AMETA_SYM_ON;
+        /// This mask is used to check whether the FUNCTION meta key is pressed
+        const FunctionOn = input_bindgen::AMETA_FUNCTION_ON;
+        /// This mask is used to check whether one of the CTRL meta keys is pressed
+        const CtrlOn = input_bindgen::AMETA_CTRL_ON;
+        /// This mask is used to check whether the left CTRL meta key is pressed
+        const CtrlLeftOn = input_bindgen::AMETA_CTRL_LEFT_ON;
+        /// This mask is used to check whether the right CTRL meta key is pressed
+        const CtrlRightOn = input_bindgen::AMETA_CTRL_RIGHT_ON;
+        /// This mask is used to check whether one of the META meta keys is pressed
+        const MetaOn = input_bindgen::AMETA_META_ON;
+        /// This mask is used to check whether the left META meta key is pressed
+        const MetaLeftOn = input_bindgen::AMETA_META_LEFT_ON;
+        /// This mask is used to check whether the right META meta key is pressed
+        const MetaRightOn = input_bindgen::AMETA_META_RIGHT_ON;
+        /// This mask is used to check whether the CAPS LOCK meta key is on
+        const CapsLockOn = input_bindgen::AMETA_CAPS_LOCK_ON;
+        /// This mask is used to check whether the NUM LOCK meta key is on
+        const NumLockOn = input_bindgen::AMETA_NUM_LOCK_ON;
+        /// This mask is used to check whether the SCROLL LOCK meta key is on
+        const ScrollLockOn = input_bindgen::AMETA_SCROLL_LOCK_ON;
+    }
+}
+
+/// A rust enum representation of a Keyboard type.
+#[repr(u32)]
+#[derive(Debug, Copy, Clone, Eq, PartialEq)]
+pub enum KeyboardType {
+    /// KEYBOARD_TYPE_NONE
+    None = input_bindgen::AINPUT_KEYBOARD_TYPE_NONE,
+    /// KEYBOARD_TYPE_NON_ALPHABETIC
+    NonAlphabetic = input_bindgen::AINPUT_KEYBOARD_TYPE_NON_ALPHABETIC,
+    /// KEYBOARD_TYPE_ALPHABETIC
+    Alphabetic = input_bindgen::AINPUT_KEYBOARD_TYPE_ALPHABETIC,
+}
+
 #[cfg(test)]
 mod tests {
     use crate::input::SourceClass;
diff --git a/libs/input/rust/keyboard_classifier.rs b/libs/input/rust/keyboard_classifier.rs
new file mode 100644
index 0000000..bd3a51c
--- /dev/null
+++ b/libs/input/rust/keyboard_classifier.rs
@@ -0,0 +1,62 @@
+/*
+ * Copyright 2024 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+//! Contains the KeyboardClassifier, that tries to identify whether an Input device is an
+//! alphabetic or non-alphabetic keyboard. It also tracks the KeyEvents produced by the device
+//! in order to verify/change the inferred keyboard type.
+
+use crate::input::{DeviceId, InputDevice, KeyboardType};
+use crate::ModifierState;
+
+/// The KeyboardClassifier is used to classify a keyboard device into non-keyboard, alphabetic
+/// keyboard or non-alphabetic keyboard
+#[derive(Default)]
+pub struct KeyboardClassifier {}
+
+impl KeyboardClassifier {
+    /// Create a new KeyboardClassifier
+    pub fn new() -> Self {
+        Default::default()
+    }
+
+    /// Adds keyboard to KeyboardClassifier
+    pub fn notify_keyboard_changed(&mut self, _device: InputDevice) {
+        // TODO(b/263559234): Implement method
+    }
+
+    /// Get keyboard type for a tracked keyboard in KeyboardClassifier
+    pub fn get_keyboard_type(&self, _device_id: DeviceId) -> KeyboardType {
+        // TODO(b/263559234): Implement method
+        KeyboardType::None
+    }
+
+    /// Tells if keyboard type classification is finalized. Once finalized the classification can't
+    /// change until device is reconnected again.
+    pub fn is_finalized(&self, _device_id: DeviceId) -> bool {
+        // TODO(b/263559234): Implement method
+        false
+    }
+
+    /// Process a key event and change keyboard type if required.
+    pub fn process_key(
+        &mut self,
+        _device_id: DeviceId,
+        _evdev_code: i32,
+        _modifier_state: ModifierState,
+    ) {
+        // TODO(b/263559234): Implement method
+    }
+}
diff --git a/libs/input/rust/lib.rs b/libs/input/rust/lib.rs
index fb3f520..5010475 100644
--- a/libs/input/rust/lib.rs
+++ b/libs/input/rust/lib.rs
@@ -18,9 +18,13 @@
 
 mod input;
 mod input_verifier;
+mod keyboard_classifier;
 
-pub use input::{DeviceId, MotionAction, MotionFlags, Source};
+pub use input::{
+    DeviceClass, DeviceId, InputDevice, ModifierState, MotionAction, MotionFlags, Source,
+};
 pub use input_verifier::InputVerifier;
+pub use keyboard_classifier::KeyboardClassifier;
 
 #[cxx::bridge(namespace = "android::input")]
 #[allow(unsafe_op_in_unsafe_fn)]
@@ -47,7 +51,8 @@
         /// }
         /// ```
         type InputVerifier;
-        fn create(name: String) -> Box<InputVerifier>;
+        #[cxx_name = create]
+        fn create_input_verifier(name: String) -> Box<InputVerifier>;
         fn process_movement(
             verifier: &mut InputVerifier,
             device_id: i32,
@@ -59,15 +64,53 @@
         fn reset_device(verifier: &mut InputVerifier, device_id: i32);
     }
 
+    #[namespace = "android::input::keyboardClassifier"]
+    extern "Rust" {
+        /// Used to classify a keyboard into alphabetic and non-alphabetic
+        type KeyboardClassifier;
+        #[cxx_name = create]
+        fn create_keyboard_classifier() -> Box<KeyboardClassifier>;
+        #[cxx_name = notifyKeyboardChanged]
+        fn notify_keyboard_changed(
+            classifier: &mut KeyboardClassifier,
+            device_id: i32,
+            identifier: RustInputDeviceIdentifier,
+            device_classes: u32,
+        );
+        #[cxx_name = getKeyboardType]
+        fn get_keyboard_type(classifier: &mut KeyboardClassifier, device_id: i32) -> u32;
+        #[cxx_name = isFinalized]
+        fn is_finalized(classifier: &mut KeyboardClassifier, device_id: i32) -> bool;
+        #[cxx_name = processKey]
+        fn process_key(
+            classifier: &mut KeyboardClassifier,
+            device_id: i32,
+            evdev_code: i32,
+            modifier_state: u32,
+        );
+    }
+
     #[derive(Debug, Copy, Clone, Eq, PartialEq, Hash)]
     pub struct RustPointerProperties {
         pub id: i32,
     }
+
+    #[derive(Debug)]
+    pub struct RustInputDeviceIdentifier {
+        pub name: String,
+        pub location: String,
+        pub unique_id: String,
+        pub bus: u16,
+        pub vendor: u16,
+        pub product: u16,
+        pub version: u16,
+        pub descriptor: String,
+    }
 }
 
-use crate::ffi::RustPointerProperties;
+use crate::ffi::{RustInputDeviceIdentifier, RustPointerProperties};
 
-fn create(name: String) -> Box<InputVerifier> {
+fn create_input_verifier(name: String) -> Box<InputVerifier> {
     Box::new(InputVerifier::new(&name, ffi::shouldLog("InputVerifierLogEvents")))
 }
 
@@ -103,3 +146,53 @@
 fn reset_device(verifier: &mut InputVerifier, device_id: i32) {
     verifier.reset_device(DeviceId(device_id));
 }
+
+fn create_keyboard_classifier() -> Box<KeyboardClassifier> {
+    Box::new(KeyboardClassifier::new())
+}
+
+fn notify_keyboard_changed(
+    classifier: &mut KeyboardClassifier,
+    device_id: i32,
+    identifier: RustInputDeviceIdentifier,
+    device_classes: u32,
+) {
+    let classes = DeviceClass::from_bits(device_classes);
+    if classes.is_none() {
+        panic!(
+            "The conversion of device class 0x{:08x} failed, please check if some device classes
+             have not been added to DeviceClass.",
+            device_classes
+        );
+    }
+    classifier.notify_keyboard_changed(InputDevice {
+        device_id: DeviceId(device_id),
+        identifier,
+        classes: classes.unwrap(),
+    });
+}
+
+fn get_keyboard_type(classifier: &mut KeyboardClassifier, device_id: i32) -> u32 {
+    classifier.get_keyboard_type(DeviceId(device_id)) as u32
+}
+
+fn is_finalized(classifier: &mut KeyboardClassifier, device_id: i32) -> bool {
+    classifier.is_finalized(DeviceId(device_id))
+}
+
+fn process_key(
+    classifier: &mut KeyboardClassifier,
+    device_id: i32,
+    evdev_code: i32,
+    meta_state: u32,
+) {
+    let modifier_state = ModifierState::from_bits(meta_state);
+    if modifier_state.is_none() {
+        panic!(
+            "The conversion of meta state 0x{:08x} failed, please check if some meta state
+             have not been added to ModifierState.",
+            meta_state
+        );
+    }
+    classifier.process_key(DeviceId(device_id), evdev_code, modifier_state.unwrap());
+}