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diff --git a/pw_digital_io/digital_io.proto b/pw_digital_io/digital_io.proto
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+// Copyright 2023 The Pigweed Authors
+//
+// 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
+//
+//     https://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.
+
+syntax = "proto3";
+
+package pw.digital_io;
+
+enum DigitalIoState {
+  INACTIVE = 0;
+  ACTIVE = 1;
+}
+
+message DigitalIoEnableRequest {
+  // Which line to select.
+  uint32 line_index = 1;
+  // Whether to enable or disable.
+  bool enable = 2;
+}
+
+message DigitalIoEnableResponse {}
+
+message DigitalIoSetStateRequest {
+  // Which line to select.
+  uint32 line_index = 1;
+  // Which state to set to.
+  DigitalIoState state = 2;
+}
+
+message DigitalIoSetStateResponse {}
+
+message DigitalIoGetStateRequest {
+  // Which line to select.
+  uint32 line_index = 1;
+}
+
+message DigitalIoGetStateResponse {
+  DigitalIoState state = 1;
+}
+
+service DigitalIo {
+  rpc Enable(DigitalIoEnableRequest) returns (DigitalIoEnableResponse) {}
+  rpc SetState(DigitalIoSetStateRequest) returns (DigitalIoSetStateResponse) {}
+  rpc GetState(DigitalIoGetStateRequest) returns (DigitalIoGetStateResponse) {}
+}