132 lines
3.4 KiB
C
132 lines
3.4 KiB
C
/*
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* Copyright (c) 2016 Intel Corporation.
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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/**
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* @file
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* @brief Disk Access layer APIs and defines
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*
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* This file contains APIs for disk access. Apart from disks, various
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* other storage media like Flash and RAM disks may implement this interface to
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* be used by various higher layers(consumers) like USB Mass storage
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* and Filesystems.
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*/
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#ifndef _DISK_ACCESS_H_
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#define _DISK_ACCESS_H_
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#include <kernel.h>
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#include <zephyr/types.h>
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#include <misc/dlist.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* Possible Cmd Codes for disk_ioctl() */
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/* Get the number of sectors in the disk */
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#define DISK_IOCTL_GET_SECTOR_COUNT 1
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/* Get the size of a disk SECTOR in bytes */
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#define DISK_IOCTL_GET_SECTOR_SIZE 2
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/* How many sectors constitute a FLASH Erase block */
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#define DISK_IOCTL_GET_ERASE_BLOCK_SZ 4
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/* Commit any cached read/writes to disk */
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#define DISK_IOCTL_CTRL_SYNC 5
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/* 3 is reserved. It used to be DISK_IOCTL_GET_DISK_SIZE */
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/* Possible return bitmasks for disk_status() */
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#define DISK_STATUS_OK 0x00
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#define DISK_STATUS_UNINIT 0x01
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#define DISK_STATUS_NOMEDIA 0x02
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#define DISK_STATUS_WR_PROTECT 0x04
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struct disk_operations;
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struct disk_info {
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sys_dnode_t node;
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char *name;
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const struct disk_operations *ops;
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};
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struct disk_operations {
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int (*init)(struct disk_info *disk);
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int (*status)(struct disk_info *disk);
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int (*read)(struct disk_info *disk, u8_t *data_buf,
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u32_t start_sector, u32_t num_sector);
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int (*write)(struct disk_info *disk, const u8_t *data_buf,
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u32_t start_sector, u32_t num_sector);
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int (*ioctl)(struct disk_info *disk, u8_t cmd, void *buff);
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};
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/*
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* @brief perform any initialization
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*
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* This call is made by the consumer before doing any IO calls so that the
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* disk or the backing device can do any initialization.
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*
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* @return 0 on success, negative errno code on fail
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*/
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int disk_access_init(const char *pdrv);
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/*
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* @brief Get the status of disk
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*
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* This call is used to get the status of the disk
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*
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* @return DISK_STATUS_OK or other DISK_STATUS_*s
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*/
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int disk_access_status(const char *pdrv);
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/*
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* @brief read data from disk
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*
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* Function to read data from disk to a memory buffer.
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*
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* @param[in] data_buf Pointer to the memory buffer to put data.
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* @param[in] start_sector Start disk sector to read from
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* @param[in] num_sector Number of disk sectors to read
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*
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* @return 0 on success, negative errno code on fail
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*/
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int disk_access_read(const char *pdrv, u8_t *data_buf,
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u32_t start_sector, u32_t num_sector);
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/*
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* @brief write data to disk
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*
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* Function write data from memory buffer to disk.
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*
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* @param[in] data_buf Pointer to the memory buffer
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* @param[in] start_sector Start disk sector to write to
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* @param[in] num_sector Number of disk sectors to write
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*
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* @return 0 on success, negative errno code on fail
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*/
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int disk_access_write(const char *pdrv, const u8_t *data_buf,
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u32_t start_sector, u32_t num_sector);
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/*
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* @brief Get/Configure disk parameters
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*
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* Function to get disk parameters and make any special device requests.
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*
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* @param[in] cmd DISK_IOCTL_* code describing the request
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*
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* @return 0 on success, negative errno code on fail
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*/
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int disk_access_ioctl(const char *pdrv, u8_t cmd, void *buff);
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int disk_access_register(struct disk_info *disk);
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int disk_access_unregister(struct disk_info *disk);
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#ifdef __cplusplus
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}
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#endif
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#endif /* _DISK_ACCESS_H_ */
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