266 lines
9.3 KiB
C
266 lines
9.3 KiB
C
/*
|
|
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 */
|
|
|
|
/** @} */
|