94 lines
3.3 KiB
C
94 lines
3.3 KiB
C
/*
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* Copyright (c) 2014, ARM Limited and Contributors. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* Neither the name of ARM nor the names of its contributors may be used
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* to endorse or promote products derived from this software without specific
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* prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef __IO_DRIVER_H__
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#define __IO_DRIVER_H__
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#include "platform.h" /* For MAX_IO_DEVICES */
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/* Generic IO entity structure,representing an accessible IO construct on the
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* device, such as a file */
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struct io_entity {
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io_dev_handle dev_handle;
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uintptr_t info;
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};
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/* Device info structure, providing device-specific functions and a means of
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* adding driver-specific state */
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struct io_dev_info {
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struct io_dev_funcs *funcs;
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uintptr_t info;
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};
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/* Structure used to create a connection to a type of device */
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struct io_dev_connector {
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/* dev_open opens a connection to a particular device driver */
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int (*dev_open)(void *spec, struct io_dev_info **dev_info);
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};
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/* Structure to hold device driver function pointers */
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struct io_dev_funcs {
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io_type (*type)(void);
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int (*open)(struct io_dev_info *dev_info, const void *spec,
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struct io_entity *entity);
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int (*seek)(struct io_entity *entity, int mode, ssize_t offset);
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int (*size)(struct io_entity *entity, size_t *length);
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int (*read)(struct io_entity *entity, void *buffer, size_t length,
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size_t *length_read);
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int (*write)(struct io_entity *entity, const void *buffer,
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size_t length, size_t *length_written);
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int (*close)(struct io_entity *entity);
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int (*dev_init)(struct io_dev_info *dev_info, const void *init_params);
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int (*dev_close)(struct io_dev_info *dev_info);
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};
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/* IO platform data - used to track devices registered for a specific
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* platform */
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struct io_plat_data {
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struct io_dev_info *devices[MAX_IO_DEVICES];
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unsigned int dev_count;
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};
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/* Operations intended to be performed during platform initialisation */
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/* Initialise the IO layer */
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void io_init(struct io_plat_data *data);
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/* Register a device driver */
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int io_register_device(struct io_dev_info *dev_info);
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#endif /* __IO_DRIVER_H__ */
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