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/*
ChibiOS - Copyright (C) 2006..2016 Giovanni Di Sirio
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
/**
* @file hal_ioblock.h
* @brief I/O block devices access.
* @details This header defines an abstract interface useful to access generic
* I/O block devices in a standardized way.
*
* @addtogroup IO_BLOCK
* @details This module defines an abstract interface for accessing generic
* block devices.<br>
* Note that no code is present, just abstract interfaces-like
* structures, you should look at the system as to a set of
* abstract C++ classes (even if written in C). This system
* has then advantage to make the access to block devices
* independent from the implementation logic.
* @{
*/
#ifndef HAL_IOBLOCK_H
#define HAL_IOBLOCK_H
/**
* @brief Driver state machine possible states.
*/
typedef enum {
BLK_UNINIT = 0, /**< Not initialized. */
BLK_STOP = 1, /**< Stopped. */
BLK_ACTIVE = 2, /**< Interface active. */
BLK_CONNECTING = 3, /**< Connection in progress. */
BLK_DISCONNECTING = 4, /**< Disconnection in progress. */
BLK_READY = 5, /**< Device ready. */
BLK_READING = 6, /**< Read operation in progress. */
BLK_WRITING = 7, /**< Write operation in progress. */
BLK_SYNCING = 8 /**< Sync. operation in progress. */
} blkstate_t;
/**
* @brief Block device info.
*/
typedef struct {
uint32_t blk_size; /**< @brief Block size in bytes. */
uint32_t blk_num; /**< @brief Total number of blocks. */
} BlockDeviceInfo;
/**
* @brief @p BaseBlockDevice specific methods.
*/
#define _base_block_device_methods \
/* Removable media detection.*/ \
bool (*is_inserted)(void *instance); \
/* Removable write protection detection.*/ \
bool (*is_protected)(void *instance); \
/* Connection to the block device.*/ \
bool (*connect)(void *instance); \
/* Disconnection from the block device.*/ \
bool (*disconnect)(void *instance); \
/* Reads one or more blocks.*/ \
bool (*read)(void *instance, uint32_t startblk, \
uint8_t *buffer, uint32_t n); \
/* Writes one or more blocks.*/ \
bool (*write)(void *instance, uint32_t startblk, \
const uint8_t *buffer, uint32_t n); \
/* Write operations synchronization.*/ \
bool (*sync)(void *instance); \
/* Obtains info about the media.*/ \
bool (*get_info)(void *instance, BlockDeviceInfo *bdip);
/**
* @brief @p BaseBlockDevice specific data.
*/
#define _base_block_device_data \
/* Driver state.*/ \
blkstate_t state;
/**
* @brief @p BaseBlockDevice virtual methods table.
*/
struct BaseBlockDeviceVMT {
_base_block_device_methods
};
/**
* @brief Base block device class.
* @details This class represents a generic, block-accessible, device.
*/
typedef struct {
/** @brief Virtual Methods Table.*/
const struct BaseBlockDeviceVMT *vmt;
_base_block_device_data
} BaseBlockDevice;
/**
* @name Macro Functions (BaseBlockDevice)
* @{
*/
/**
* @brief Returns the driver state.
* @note Can be called in ISR context.
*
* @param[in] ip pointer to a @p BaseBlockDevice or derived class
*
* @return The driver state.
*
* @special
*/
#define blkGetDriverState(ip) ((ip)->state)
/**
* @brief Determines if the device is transferring data.
* @note Can be called in ISR context.
*
* @param[in] ip pointer to a @p BaseBlockDevice or derived class
*
* @return The driver state.
* @retval FALSE the device is not transferring data.
* @retval TRUE the device not transferring data.
*
* @special
*/
#define blkIsTransferring(ip) ((((ip)->state) == BLK_CONNECTING) || \
(((ip)->state) == BLK_DISCONNECTING) || \
(((ip)->state) == BLK_READING) || \
(((ip)->state) == BLK_WRITING))
/**
* @brief Returns the media insertion status.
* @note On some implementations this function can only be called if the
* device is not transferring data.
* The function @p blkIsTransferring() should be used before calling
* this function.
*
* @param[in] ip pointer to a @p BaseBlockDevice or derived class
*
* @return The media state.
* @retval FALSE media not inserted.
* @retval TRUE media inserted.
*
* @api
*/
#define blkIsInserted(ip) ((ip)->vmt->is_inserted(ip))
/**
* @brief Returns the media write protection status.
*
* @param[in] ip pointer to a @p BaseBlockDevice or derived class
*
* @return The media state.
* @retval FALSE writable media.
* @retval TRUE non writable media.
*
* @api
*/
#define blkIsWriteProtected(ip) ((ip)->vmt->is_protected(ip))
/**
* @brief Performs the initialization procedure on the block device.
* @details This function should be performed before I/O operations can be
* attempted on the block device and after insertion has been
* confirmed using @p blkIsInserted().
*
* @param[in] ip pointer to a @p BaseBlockDevice or derived class
*
* @return The operation status.
* @retval HAL_SUCCESS operation succeeded.
* @retval HAL_FAILED operation failed.
*
* @api
*/
#define blkConnect(ip) ((ip)->vmt->connect(ip))
/**
* @brief Terminates operations on the block device.
* @details This operation safely terminates operations on the block device.
*
* @param[in] ip pointer to a @p BaseBlockDevice or derived class
*
* @return The operation status.
* @retval HAL_SUCCESS operation succeeded.
* @retval HAL_FAILED operation failed.
*
* @api
*/
#define blkDisconnect(ip) ((ip)->vmt->disconnect(ip))
/**
* @brief Reads one or more blocks.
*
* @param[in] ip pointer to a @p BaseBlockDevice or derived class
* @param[in] startblk first block to read
* @param[out] buf pointer to the read buffer
* @param[in] n number of blocks to read
*
* @return The operation status.
* @retval HAL_SUCCESS operation succeeded.
* @retval HAL_FAILED operation failed.
*
* @api
*/
#define blkRead(ip, startblk, buf, n) \
((ip)->vmt->read(ip, startblk, buf, n))
/**
* @brief Writes one or more blocks.
*
* @param[in] ip pointer to a @p BaseBlockDevice or derived class
* @param[in] startblk first block to write
* @param[out] buf pointer to the write buffer
* @param[in] n number of blocks to write
*
* @return The operation status.
* @retval HAL_SUCCESS operation succeeded.
* @retval HAL_FAILED operation failed.
*
* @api
*/
#define blkWrite(ip, startblk, buf, n) \
((ip)->vmt->write(ip, startblk, buf, n))
/**
* @brief Ensures write synchronization.
*
* @param[in] ip pointer to a @p BaseBlockDevice or derived class
*
* @return The operation status.
* @retval HAL_SUCCESS operation succeeded.
* @retval HAL_FAILED operation failed.
*
* @api
*/
#define blkSync(ip) ((ip)->vmt->sync(ip))
/**
* @brief Returns a media information structure.
*
* @param[in] ip pointer to a @p BaseBlockDevice or derived class
* @param[out] bdip pointer to a @p BlockDeviceInfo structure
*
* @return The operation status.
* @retval HAL_SUCCESS operation succeeded.
* @retval HAL_FAILED operation failed.
*
* @api
*/
#define blkGetInfo(ip, bdip) ((ip)->vmt->get_info(ip, bdip))
/** @} */
#endif /* HAL_IOBLOCK_H */
/** @} */
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