system/fidl/ddk/protocols/i2c-impl.fidl

// Copyright 2018 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

library ddk.protocol.i2c;

using zx;

/// Low-level protocol for i2c drivers.
[Layout="ddk-protocol"]
interface I2cImpl {
    1: GetBusCount() -> (uint32 count);
    2: GetMaxTransferSize(uint32 bus_id) -> (zx.status s, usize size);
    /// Sets the bitrate for the i2c bus in KHz units.
    3: SetBitrate(uint32 bus_id, uint32 bitrate) -> (zx.status s);
    [Async]
    4: Transact(uint32 bus_id, uint16 address, vector<void> write) -> (vector<void> read);
};