1// Copyright 2016 The Fuchsia Authors. All rights reserved. 2// Use of this source code is governed by a BSD-style license that can be 3// found in the LICENSE file. 4 5#include <ddk/binding.h> 6#include <ddk/device.h> 7#include <ddk/driver.h> 8 9#include <zircon/types.h> 10#include <stdio.h> 11#include <stdlib.h> 12#include <string.h> 13 14// null is the /dev/null device. 15 16static zx_status_t null_read(void* ctx, void* buf, size_t count, zx_off_t off, size_t* actual) { 17 *actual = 0; 18 return ZX_OK; 19} 20 21static zx_status_t null_write(void* ctx, const void* buf, size_t count, zx_off_t off, size_t* actual) { 22 *actual = count; 23 return ZX_OK; 24} 25 26static zx_protocol_device_t null_device_proto = { 27 .version = DEVICE_OPS_VERSION, 28 .read = null_read, 29 .write = null_write, 30}; 31 32zx_status_t null_bind(void* ctx, zx_device_t* parent, void** cookie) { 33 device_add_args_t args = { 34 .version = DEVICE_ADD_ARGS_VERSION, 35 .name = "null", 36 .ops = &null_device_proto, 37 }; 38 39 zx_device_t* dev; 40 return device_add(parent, &args, &dev); 41} 42