aboutsummaryrefslogtreecommitdiff
path: root/ubi-utils/include/libmtd.h
blob: c50059d9ab6beed715d10d652b06869338c92161 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
/*
 * Copyright (C) 2008 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

/**
 * struct mtd_info - information about an MTD device.
 * @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
 * @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 (not set by 'mtd_get_info()'!!!)
 * @rdonly: non-zero if the device is read-only
 * @allows_bb: non-zero if the MTD device may have bad eraseblocks
 * @fd: descriptor of the opened MTD character device node
 */
struct mtd_info
{
	int num;
	int major;
	int minor;
	int type;
	const char *type_str;
	long long size;
	int eb_cnt;
	int eb_size;
	int min_io_size;
	int subpage_size;
	unsigned int rdonly:1;
	unsigned int allows_bb:1;
	int fd;
};

/**
 * mtd_get_info - get information about an MTD device.
 * @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.
 */
int mtd_get_info(const char *node, struct mtd_info *mtd);

/**
 * mtd_erase - erase an eraseblock.
 * @mtd: MTD device description object
 * @eb: eraseblock to erase
 *
 * This function erases the eraseblock and returns %0 in case of success and
 * %-1 in case of failure.
 */
int mtd_erase(const struct mtd_info *mtd, int eb);

/**
 * mtd_is_bad - check if eraseblock is bad.
 * @mtd: MTD device description object
 * @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_info *mtd, int eb);

/**
 * mtd_mark_bad - marks the block as bad.
 * @mtd: MTD device description object
 * @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_info *mtd, int eb);

/**
 * mtd_read - read data from an MTD device.
 * @mtd: MTD device description object
 * @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_info *mtd, int eb, int offs, void *buf, int len);

/**
 * mtd_write - write data to an MTD device.
 * @mtd: MTD device description object
 * @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_info *mtd, int eb, int offs, void *buf, int len);

#ifdef __cplusplus
}
#endif

#endif /* __LIBMTD_H__ */