// 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.
@available(added=7)
library fuchsia.hardware.serialimpl;

using zx;
using fuchsia.hardware.serial;

type SerialState = strict enum : uint32 {
    READABLE = 0x1;
    WRITABLE = 0x2;
};

/// Callback for notification of readable/writeable state changes
/// This may be called from an interrupt thread it should just signal another thread
/// and return as soon as possible. In particular, it may not be safe to make protocol calls
/// from these callbacks.
@transport("Banjo")
@banjo_layout("ddk-callback")
protocol SerialNotify {
    Callback(struct {
        state SerialState;
    }) -> ();
};

@transport("Banjo")
@banjo_layout("ddk-protocol")
protocol SerialImpl {
    GetInfo() -> (struct {
        s zx.status;
        info fuchsia.hardware.serial.SerialPortInfo;
    });
    /// Configures the given serial port.
    Config(struct {
        baud_rate uint32;
        flags uint32;
    }) -> (struct {
        s zx.status;
    });
    Enable(struct {
        enable bool;
    }) -> (struct {
        s zx.status;
    });
    Read() -> (struct {
        s zx.status;
        @buffer
        buf vector<uint8>:MAX;
    });
    Write(struct {
        @buffer
        buf vector<uint8>:MAX;
    }) -> (struct {
        s zx.status;
        actual uint64;
    });
    SetNotifyCallback(resource struct {
        cb client_end:SerialNotify;
    }) -> (struct {
        s zx.status;
    });
};