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-rw-r--r--drivers/io/io_dummy.c155
1 files changed, 155 insertions, 0 deletions
diff --git a/drivers/io/io_dummy.c b/drivers/io/io_dummy.c
new file mode 100644
index 0000000..4f0cda6
--- /dev/null
+++ b/drivers/io/io_dummy.c
@@ -0,0 +1,155 @@
+/*
+ * Copyright (c) 2016, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <assert.h>
+#include <string.h>
+
+#include <common/debug.h>
+#include <drivers/io/io_driver.h>
+#include <drivers/io/io_dummy.h>
+#include <drivers/io/io_storage.h>
+
+struct file_state {
+ int in_use;
+ size_t size;
+};
+
+static struct file_state current_file = {0};
+
+/* Identify the device type as dummy */
+static io_type_t device_type_dummy(void)
+{
+ return IO_TYPE_DUMMY;
+}
+
+/* Dummy device functions */
+static int dummy_dev_open(const uintptr_t dev_spec, io_dev_info_t **dev_info);
+static int dummy_block_open(io_dev_info_t *dev_info, const uintptr_t spec,
+ io_entity_t *entity);
+static int dummy_block_len(io_entity_t *entity, size_t *length);
+static int dummy_block_read(io_entity_t *entity, uintptr_t buffer,
+ size_t length, size_t *length_read);
+static int dummy_block_close(io_entity_t *entity);
+static int dummy_dev_close(io_dev_info_t *dev_info);
+
+
+static const io_dev_connector_t dummy_dev_connector = {
+ .dev_open = dummy_dev_open
+};
+
+
+static const io_dev_funcs_t dummy_dev_funcs = {
+ .type = device_type_dummy,
+ .open = dummy_block_open,
+ .seek = NULL,
+ .size = dummy_block_len,
+ .read = dummy_block_read,
+ .write = NULL,
+ .close = dummy_block_close,
+ .dev_init = NULL,
+ .dev_close = dummy_dev_close,
+};
+
+
+static const io_dev_info_t dummy_dev_info = {
+ .funcs = &dummy_dev_funcs,
+ .info = (uintptr_t)NULL
+};
+
+
+/* Open a connection to the dummy device */
+static int dummy_dev_open(const uintptr_t dev_spec __attribute__((unused)),
+ io_dev_info_t **dev_info)
+{
+ assert(dev_info != NULL);
+ *dev_info = (io_dev_info_t *)&dummy_dev_info;
+
+ return 0;
+}
+
+
+/* Close a connection to the dummy device */
+static int dummy_dev_close(io_dev_info_t *dev_info)
+{
+ return 0;
+}
+
+
+/* Open a file on the dummy device */
+static int dummy_block_open(io_dev_info_t *dev_info, const uintptr_t spec,
+ io_entity_t *entity)
+{
+ int result;
+ const io_block_spec_t *block_spec = (io_block_spec_t *)spec;
+
+ if (current_file.in_use == 0) {
+ assert(block_spec != NULL);
+ assert(entity != NULL);
+
+ current_file.in_use = 1;
+ current_file.size = block_spec->length;
+ entity->info = (uintptr_t)&current_file;
+ result = 0;
+ } else {
+ WARN("A Dummy device is already active. Close first.\n");
+ result = -ENOMEM;
+ }
+
+ return result;
+}
+
+
+/* Return the size of a file on the dummy device */
+static int dummy_block_len(io_entity_t *entity, size_t *length)
+{
+ assert(entity != NULL);
+ assert(length != NULL);
+
+ *length = ((struct file_state *)entity->info)->size;
+
+ return 0;
+}
+
+
+/* Read data from a file on the dummy device */
+static int dummy_block_read(io_entity_t *entity, uintptr_t buffer,
+ size_t length, size_t *length_read)
+{
+ assert(length_read != NULL);
+
+ *length_read = length;
+
+ return 0;
+}
+
+
+/* Close a file on the dummy device */
+static int dummy_block_close(io_entity_t *entity)
+{
+ assert(entity != NULL);
+
+ entity->info = 0;
+ current_file.in_use = 0;
+
+ return 0;
+}
+
+
+/* Exported functions */
+
+/* Register the dummy driver with the IO abstraction */
+int register_io_dev_dummy(const io_dev_connector_t **dev_con)
+{
+ int result;
+
+ assert(dev_con != NULL);
+
+ result = io_register_device(&dummy_dev_info);
+ if (result == 0)
+ *dev_con = &dummy_dev_connector;
+
+ return result;
+}