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155 lines
3.2 KiB
155 lines
3.2 KiB
/*
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* Copyright (c) 2016, ARM Limited and Contributors. All rights reserved.
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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#include <assert.h>
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#include <string.h>
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#include <common/debug.h>
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#include <drivers/io/io_driver.h>
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#include <drivers/io/io_dummy.h>
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#include <drivers/io/io_storage.h>
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struct file_state {
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int in_use;
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size_t size;
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};
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static struct file_state current_file = {0};
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/* Identify the device type as dummy */
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static io_type_t device_type_dummy(void)
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{
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return IO_TYPE_DUMMY;
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}
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/* Dummy device functions */
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static int dummy_dev_open(const uintptr_t dev_spec, io_dev_info_t **dev_info);
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static int dummy_block_open(io_dev_info_t *dev_info, const uintptr_t spec,
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io_entity_t *entity);
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static int dummy_block_len(io_entity_t *entity, size_t *length);
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static int dummy_block_read(io_entity_t *entity, uintptr_t buffer,
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size_t length, size_t *length_read);
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static int dummy_block_close(io_entity_t *entity);
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static int dummy_dev_close(io_dev_info_t *dev_info);
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static const io_dev_connector_t dummy_dev_connector = {
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.dev_open = dummy_dev_open
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};
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static const io_dev_funcs_t dummy_dev_funcs = {
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.type = device_type_dummy,
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.open = dummy_block_open,
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.seek = NULL,
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.size = dummy_block_len,
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.read = dummy_block_read,
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.write = NULL,
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.close = dummy_block_close,
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.dev_init = NULL,
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.dev_close = dummy_dev_close,
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};
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static const io_dev_info_t dummy_dev_info = {
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.funcs = &dummy_dev_funcs,
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.info = (uintptr_t)NULL
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};
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/* Open a connection to the dummy device */
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static int dummy_dev_open(const uintptr_t dev_spec __attribute__((unused)),
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io_dev_info_t **dev_info)
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{
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assert(dev_info != NULL);
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*dev_info = (io_dev_info_t *)&dummy_dev_info;
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return 0;
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}
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/* Close a connection to the dummy device */
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static int dummy_dev_close(io_dev_info_t *dev_info)
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{
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return 0;
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}
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/* Open a file on the dummy device */
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static int dummy_block_open(io_dev_info_t *dev_info, const uintptr_t spec,
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io_entity_t *entity)
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{
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int result;
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const io_block_spec_t *block_spec = (io_block_spec_t *)spec;
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if (current_file.in_use == 0) {
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assert(block_spec != NULL);
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assert(entity != NULL);
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current_file.in_use = 1;
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current_file.size = block_spec->length;
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entity->info = (uintptr_t)¤t_file;
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result = 0;
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} else {
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WARN("A Dummy device is already active. Close first.\n");
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result = -ENOMEM;
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}
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return result;
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}
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/* Return the size of a file on the dummy device */
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static int dummy_block_len(io_entity_t *entity, size_t *length)
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{
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assert(entity != NULL);
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assert(length != NULL);
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*length = ((struct file_state *)entity->info)->size;
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return 0;
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}
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/* Read data from a file on the dummy device */
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static int dummy_block_read(io_entity_t *entity, uintptr_t buffer,
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size_t length, size_t *length_read)
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{
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assert(length_read != NULL);
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*length_read = length;
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return 0;
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}
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/* Close a file on the dummy device */
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static int dummy_block_close(io_entity_t *entity)
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{
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assert(entity != NULL);
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entity->info = 0;
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current_file.in_use = 0;
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return 0;
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}
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/* Exported functions */
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/* Register the dummy driver with the IO abstraction */
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int register_io_dev_dummy(const io_dev_connector_t **dev_con)
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{
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int result;
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assert(dev_con != NULL);
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result = io_register_device(&dummy_dev_info);
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if (result == 0)
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*dev_con = &dummy_dev_connector;
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return result;
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}
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