1// Copyright 2017 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 14static zx_status_t zero_read(void* ctx, void* buf, size_t count, zx_off_t off, size_t* actual) { 15 memset(buf, 0, count); 16 *actual = count; 17 return ZX_OK; 18} 19 20static zx_status_t zero_write(void* ctx, const void* buf, size_t count, zx_off_t off, 21 size_t* actual) { 22 return ZX_ERR_NOT_SUPPORTED; 23} 24 25static zx_protocol_device_t zero_device_proto = { 26 .version = DEVICE_OPS_VERSION, 27 .read = zero_read, 28 .write = zero_write, 29}; 30 31zx_status_t zero_bind(void* ctx, zx_device_t* parent, void** cookie) { 32 device_add_args_t args = { 33 .version = DEVICE_ADD_ARGS_VERSION, 34 .name = "zero", 35 .ops = &zero_device_proto, 36 }; 37 38 zx_device_t* dev; 39 return device_add(parent, &args, &dev); 40} 41