222 lines
7.4 KiB
C
222 lines
7.4 KiB
C
/*
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ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010,
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2011,2012 Giovanni Di Sirio.
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This file is part of ChibiOS/RT.
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ChibiOS/RT is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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ChibiOS/RT is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/**
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* @file io_block.h
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* @brief I/O block devices access.
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* @details This header defines abstract interfaces useful to access generic
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* I/O block devices in a standardized way.
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*
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* @addtogroup IO_BLOCK
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* @details This module define an abstract interface for accessing generic
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* block devices.
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* Note that no code is present, just abstract interfaces-like
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* structures, you should look at the system as to a set of
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* abstract C++ classes (even if written in C). This system
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* has then advantage to make the access to block devices
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* independent from the implementation logic.
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* @{
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*/
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#ifndef _IO_BLOCK_H_
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#define _IO_BLOCK_H_
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/**
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* @brief Block device info.
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*/
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typedef struct {
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uint32_t blk_size; /**< @brief Block size in bytes. */
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uint32_t blk_num; /**< @brief Total number of blocks. */
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} BlockDeviceInfo;
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/**
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* @brief @p BaseBlockDevice specific methods.
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*/
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#define _base_block_device_methods \
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/* Removable media detection.*/ \
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bool_t (*is_inserted)(void *instance); \
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/* Removable write protection detection.*/ \
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bool_t (*is_protected)(void *instance); \
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/* Connection to the block device.*/ \
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bool_t (*connect)(void *instance); \
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/* Disconnection from the block device.*/ \
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bool_t (*disconnect)(void *instance); \
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/* Reads one or more blocks.*/ \
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bool_t (*read)(void *instance, uint32_t startblk, \
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uint8_t *buffer, uint32_t n); \
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/* Writes one or more blocks.*/ \
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bool_t (*write)(void *instance, uint32_t startblk, \
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const uint8_t *buffer, uint32_t n); \
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/* Write operations synchronization.*/ \
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bool_t (*sync)(void *instance); \
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/* Obtains info about the media.*/ \
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bool_t (*get_info)(void *instance, BlockDeviceInfo *bdip);
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/**
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* @brief @p BaseBlockDevice specific data.
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* @note It is empty because @p BaseBlockDevice is only an interface
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* without implementation.
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*/
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#define _base_block_device_data
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/**
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* @brief @p BaseBlockDevice virtual methods table.
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*/
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struct BaseBlockDeviceVMT {
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_base_block_device_methods
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};
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/**
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* @brief Base block device class.
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* @details This class represents a generic, block-accessible, device.
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*/
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typedef struct {
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/** @brief Virtual Methods Table.*/
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const struct BaseBlockDeviceVMT *vmt;
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_base_block_device_data
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} BaseBlockDevice;
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/**
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* @name Macro Functions (BaseBlockDevice)
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* @{
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*/
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/**
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* @brief Returns the media insertion status.
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*
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* @param[in] ip pointer to a @p BaseBlockDevice or derived class
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*
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* @return The media state.
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* @retval FALSE media not inserted.
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* @retval TRUE media inserted.
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*
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* @api
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*/
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#define blkIsInserted(ip) ((ip)->vmt->is_inserted(ip))
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/**
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* @brief Returns the media write protection status.
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*
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* @param[in] ip pointer to a @p BaseBlockDevice or derived class
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*
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* @return The media state.
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* @retval FALSE writable media.
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* @retval TRUE non writable media.
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*
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* @api
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*/
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#define blkIsWriteProtected(ip) ((ip)->vmt->is_protected(ip))
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/**
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* @brief Performs the initialization procedure on the block device.
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* @details This function should be performed before I/O operations can be
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* attempted on the block device and after insertion has been
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* confirmed using @p blkIsInserted().
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*
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* @param[in] ip pointer to a @p BaseBlockDevice or derived class
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*
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* @return The operation status.
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* @retval FALSE operation succeeded.
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* @retval TRUE operation failed.
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*
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* @api
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*/
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#define blkConnect(ip) ((ip)->vmt->connect(ip))
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/**
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* @brief Terminates operations on the block device.
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* @details This operation safely terminates operations on the block device.
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*
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* @param[in] ip pointer to a @p BaseBlockDevice or derived class
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*
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* @return The operation status.
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* @retval FALSE operation succeeded.
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* @retval TRUE operation failed.
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*
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* @api
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*/
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#define blkDisconnect(ip) ((ip)->vmt-disconnect(ip))
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/**
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* @brief Reads one or more blocks.
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*
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* @param[in] ip pointer to a @p BaseBlockDevice or derived class
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* @param[in] startblk first block to read
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* @param[out] buf pointer to the read buffer
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* @param[in] n number of blocks to read
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*
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* @return The operation status.
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* @retval FALSE operation succeeded.
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* @retval TRUE operation failed.
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*
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* @api
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*/
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#define blkRead(ip, startblk, buf, n) \
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((ip)->vmt->read(ip, startblk, buf, n))
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/**
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* @brief Writes one or more blocks.
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*
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* @param[in] ip pointer to a @p BaseBlockDevice or derived class
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* @param[in] startblk first block to write
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* @param[out] buf pointer to the write buffer
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* @param[in] n number of blocks to write
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*
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* @return The operation status.
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* @retval FALSE operation succeeded.
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* @retval TRUE operation failed.
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*
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* @api
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*/
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#define blkWrite(ip, startblk, buf, n) \
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((ip)->vmt->write(ip, startblk, buf, n))
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/**
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* @brief Ensures write synchronization.
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*
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* @param[in] ip pointer to a @p BaseBlockDevice or derived class
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*
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* @return The operation status.
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* @retval FALSE operation succeeded.
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* @retval TRUE operation failed.
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*
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* @api
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*/
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#define blkSync(ip) ((ip)->vmt->sync(ip))
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/**
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* @brief Returns a media information structure.
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*
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* @param[in] ip pointer to a @p BaseBlockDevice or derived class
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* @param[out] bdip pointer to a @p BlockDeviceInfo structure
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*
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* @return The operation status.
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* @retval FALSE operation succeeded.
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* @retval TRUE operation failed.
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*
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* @api
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*/
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#define blkGetInfo(ip, bdip) ((ip)->vmt->get_info(ip, bdip))
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/** @} */
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#endif /* _IO_BLOCK_H_ */
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/** @} */
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