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/*
* Copyright (C) 2008, 2009 Nokia Corporation
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
* the GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
* Author: Artem Bityutskiy
*
* MTD library.
*/
#ifndef __LIBMTD_H__
#define __LIBMTD_H__
#ifdef __cplusplus
extern "C" {
#endif
/* Maximum MTD device name length */
#define MTD_NAME_MAX 127
/* Maximum MTD device type string length */
#define MTD_TYPE_MAX 64
/* MTD library descriptor */
typedef void * libmtd_t;
/**
* @dev_count: count of MTD devices in system
* @lowest_dev_num: lowest MTD device number
* @highest_dev_num: highest MTD device number
* @sysfs_supported: non-zero if sysfs is supported by MTD
*/
struct mtd_info
{
int dev_count;
int lowest_dev_num;
int highest_dev_num;
unsigned int sysfs_supported:1;
};
/**
* struct mtd_dev_info - information about an MTD device.
* @dev_num: MTD device number
* @major: major number of corresponding character device
* @minor: minor number of corresponding character device
* @type: flash type (constants like %MTD_NANDFLASH defined in mtd-abi.h)
* @type_str: static R/O flash type string
* @name: device name
* @size: device size in bytes
* @eb_cnt: count of eraseblocks
* @eb_size: eraseblock size
* @min_io_size: minimum input/output unit size
* @subpage_size: sub-page size
* @oob_size: OOB size (zero if the device does not have OOB area)
* @region_cnt: count of additional erase regions
* @writable: zero if the device is read-only
* @bb_allowed: non-zero if the MTD device may have bad eraseblocks
*/
struct mtd_dev_info
{
int dev_num;
int major;
int minor;
int type;
const char type_str[MTD_TYPE_MAX + 1];
const char name[MTD_NAME_MAX + 1];
long long size;
int eb_cnt;
int eb_size;
int min_io_size;
int subpage_size;
int oob_size;
int region_cnt;
unsigned int writable:1;
unsigned int bb_allowed:1;
};
/**
* libmtd_open - open MTD library.
*
* This function initializes and opens the MTD library and returns MTD library
* descriptor in case of success and %NULL in case of failure. In case of
* failure, errno contains zero if MTD is not present in the system, or
* contains the error code if a real error happened.
*/
libmtd_t libmtd_open(void);
/**
* libmtd_close - close MTD library.
* @desc: MTD library descriptor
*/
void libmtd_close(libmtd_t desc);
/**
* mtd_get_info - get general MTD information.
* @desc: MTD library descriptor
* @info: the MTD device information is returned here
*
* This function fills the passed @info object with general MTD information and
* returns %0 in case of success and %-1 in case of failure. If MTD subsystem is
* not present in the system, errno is set to @ENODEV.
*/
int mtd_get_info(libmtd_t desc, struct mtd_info *info);
/**
* mtd_get_dev_info - get information about an MTD device.
* @desc: MTD library descriptor
* @node: name of the MTD device node
* @mtd: the MTD device information is returned here
*
* This function gets information about MTD device defined by the @node device
* node file and saves this information in the @mtd object. Returns %0 in case
* of success and %-1 in case of failure. If MTD subsystem is not present in the
* system, or the MTD device does not exist, errno is set to @ENODEV.
*/
int mtd_get_dev_info(libmtd_t desc, const char *node, struct mtd_dev_info *mtd);
/**
* mtd_get_dev_info1 - get information about an MTD device.
* @desc: MTD library descriptor
* @dev_num: MTD device number to fetch information about
* @mtd: the MTD device information is returned here
*
* This function is identical to 'mtd_get_dev_info()' except that it accepts
* MTD device number, not MTD character device.
*/
int mtd_get_dev_info1(libmtd_t desc, int dev_num, struct mtd_dev_info *mtd);
/**
* mtd_erase - erase an eraseblock.
* @mtd: MTD device description object
* @fd: MTD device node file descriptor
* @eb: eraseblock to erase
*
* This function erases eraseblock @eb of MTD device described by @fd. Returns
* %0 in case of success and %-1 in case of failure.
*/
int mtd_erase(const struct mtd_dev_info *mtd, int fd, int eb);
/**
* mtd_is_bad - check if eraseblock is bad.
* @mtd: MTD device description object
* @fd: MTD device node file descriptor
* @eb: eraseblock to check
*
* This function checks if eraseblock @eb is bad. Returns %0 if not, %1 if yes,
* and %-1 in case of failure.
*/
int mtd_is_bad(const struct mtd_dev_info *mtd, int fd, int eb);
/**
* mtd_mark_bad - marks the block as bad.
* @mtd: MTD device description object
* @fd: MTD device node file descriptor
* @eb: eraseblock to mark bad
*
* This function marks the eraseblock @eb as bad. Returns %0 if success
* %-1 if failure
*/
int mtd_mark_bad(const struct mtd_dev_info *mtd, int fd, int eb);
/**
* mtd_read - read data from an MTD device.
* @mtd: MTD device description object
* @fd: MTD device node file descriptor
* @eb: eraseblock to read from
* @offs: offset withing the eraseblock to read from
* @buf: buffer to read data to
* @len: how many bytes to read
*
* This function reads @len bytes of data from eraseblock @eb and offset @offs
* of the MTD device defined by @mtd and stores the read data at buffer @buf.
* Returns %0 in case of success and %-1 in case of failure.
*/
int mtd_read(const struct mtd_dev_info *mtd, int fd, int eb, int offs,
void *buf, int len);
/**
* mtd_write - write data to an MTD device.
* @mtd: MTD device description object
* @fd: MTD device node file descriptor
* @eb: eraseblock to write to
* @offs: offset withing the eraseblock to write to
* @buf: buffer to write
* @len: how many bytes to write
*
* This function writes @len bytes of data to eraseblock @eb and offset @offs
* of the MTD device defined by @mtd. Returns %0 in case of success and %-1 in
* case of failure.
*/
int mtd_write(const struct mtd_dev_info *mtd, int fd, int eb, int offs,
void *buf, int len);
/**
* mtd_probe_node - test MTD node.
* @desc: MTD library descriptor
* @node: the node to test
*
* This function tests whether @node is an MTD device node and returns %1 if it
* is, and %-1 if it is not (errno is ENODEV in this case) or if an error
* occurred.
*/
int mtd_probe_node(libmtd_t desc, const char *node);
#ifdef __cplusplus
}
#endif
#endif /* __LIBMTD_H__ */
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