| /* |
| * 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; |
| |
| /* Forward decls */ |
| struct region_info_user; |
| |
| /** |
| * @mtd_dev_cnt: count of MTD devices in system |
| * @lowest_mtd_num: lowest MTD device number in system |
| * @highest_mtd_num: highest MTD device number in system |
| * @sysfs_supported: non-zero if sysfs is supported by MTD |
| */ |
| struct mtd_info |
| { |
| int mtd_dev_cnt; |
| int lowest_mtd_num; |
| int highest_mtd_num; |
| unsigned int sysfs_supported:1; |
| }; |
| |
| /** |
| * struct mtd_dev_info - information about an MTD device. |
| * @mtd_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 mtd_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_dev_present - check whether a MTD device is present. |
| * @desc: MTD library descriptor |
| * @mtd_num: MTD device number to check |
| * |
| * This function returns %1 if MTD device is present and %0 if not. |
| */ |
| int mtd_dev_present(libmtd_t desc, int mtd_num); |
| |
| /** |
| * 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 |
| * @mtd_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 mtd_num, struct mtd_dev_info *mtd); |
| |
| /** |
| * mtd_lock - lock eraseblocks. |
| * @desc: MTD library descriptor |
| * @mtd: MTD device description object |
| * @fd: MTD device node file descriptor |
| * @eb: eraseblock to lock |
| * |
| * This function locks eraseblock @eb. Returns %0 in case of success and %-1 |
| * in case of failure. |
| */ |
| int mtd_lock(const struct mtd_dev_info *mtd, int fd, int eb); |
| |
| /** |
| * mtd_unlock - unlock eraseblocks. |
| * @desc: MTD library descriptor |
| * @mtd: MTD device description object |
| * @fd: MTD device node file descriptor |
| * @eb: eraseblock to lock |
| * |
| * This function unlocks eraseblock @eb. Returns %0 in case of success and %-1 |
| * in case of failure. |
| */ |
| int mtd_unlock(const struct mtd_dev_info *mtd, int fd, int eb); |
| |
| /** |
| * mtd_erase - erase an eraseblock. |
| * @desc: MTD library descriptor |
| * @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(libmtd_t desc, const struct mtd_dev_info *mtd, int fd, int eb); |
| |
| /** |
| * mtd_regioninfo - get information about an erase region. |
| * @fd: MTD device node file descriptor |
| * @regidx: index of region to look up |
| * @reginfo: the region information is returned here |
| * |
| * This function gets information about an erase region defined by the |
| * @regidx index and saves this information in the @reginfo object. |
| * Returns %0 in case of success and %-1 in case of failure. If the |
| * @regidx is not valid or unavailable, errno is set to @ENODEV. |
| */ |
| int mtd_regioninfo(int fd, int regidx, struct region_info_user *reginfo); |
| |
| /** |
| * mtd_is_locked - see if the specified eraseblock is locked. |
| * @mtd: MTD device description object |
| * @fd: MTD device node file descriptor |
| * @eb: eraseblock to check |
| * |
| * This function checks to see if eraseblock @eb of MTD device described |
| * by @fd is locked. Returns %0 if it is unlocked, %1 if it is locked, and |
| * %-1 in case of failure. If the ioctl is not supported (support was added in |
| * Linux kernel 2.6.36) or this particular device does not support it, errno is |
| * set to @ENOTSUPP. |
| */ |
| int mtd_is_locked(const struct mtd_dev_info *mtd, int fd, int eb); |
| |
| /** |
| * mtd_torture - torture an eraseblock. |
| * @desc: MTD library descriptor |
| * @mtd: MTD device description object |
| * @fd: MTD device node file descriptor |
| * @eb: eraseblock to torture |
| * |
| * This function tortures eraseblock @eb. Returns %0 in case of success and %-1 |
| * in case of failure. |
| */ |
| int mtd_torture(libmtd_t desc, 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 - mark an eraseblock as bad. |
| * @mtd: MTD device description object |
| * @fd: MTD device node file descriptor |
| * @eb: eraseblock to mark as bad |
| * |
| * This function marks eraseblock @eb as bad. Returns %0 in case of success and |
| * %-1 in case of 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. |
| * @desc: MTD library descriptor |
| * @mtd: MTD device description object |
| * @fd: MTD device node file descriptor |
| * @eb: eraseblock to write to |
| * @offs: offset withing the eraseblock to write to |
| * @data: data buffer to write |
| * @len: how many data bytes to write |
| * @oob: OOB buffer to write |
| * @ooblen: how many OOB bytes to write |
| * @mode: write mode (e.g., %MTD_OOB_PLACE, %MTD_OOB_RAW) |
| * |
| * 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. |
| * |
| * Can only write to a single page at a time if writing to OOB. |
| */ |
| int mtd_write(libmtd_t desc, const struct mtd_dev_info *mtd, int fd, int eb, |
| int offs, void *data, int len, void *oob, int ooblen, |
| uint8_t mode); |
| |
| /** |
| * mtd_read_oob - read out-of-band area. |
| * @desc: MTD library descriptor |
| * @mtd: MTD device description object |
| * @fd: MTD device node file descriptor |
| * @start: page-aligned start address |
| * @length: number of OOB bytes to read |
| * @data: read buffer |
| * |
| * This function reads @length OOB bytes starting from address @start on |
| * MTD device described by @fd. The address is specified as page byte offset |
| * from the beginning of the MTD device. This function returns %0 in case of |
| * success and %-1 in case of failure. |
| */ |
| int mtd_read_oob(libmtd_t desc, const struct mtd_dev_info *mtd, int fd, |
| uint64_t start, uint64_t length, void *data); |
| |
| /** |
| * mtd_write_oob - write out-of-band area. |
| * @desc: MTD library descriptor |
| * @mtd: MTD device description object |
| * @fd: MTD device node file descriptor |
| * @start: page-aligned start address |
| * @length: number of OOB bytes to write |
| * @data: write buffer |
| * |
| * This function writes @length OOB bytes starting from address @start on |
| * MTD device described by @fd. The address is specified as page byte offset |
| * from the beginning of the MTD device. Returns %0 in case of success and %-1 |
| * in case of failure. |
| */ |
| int mtd_write_oob(libmtd_t desc, const struct mtd_dev_info *mtd, int fd, |
| uint64_t start, uint64_t length, void *data); |
| |
| /** |
| * mtd_write_img - write a file to 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 |
| * @img_name: the file to write |
| * |
| * This function writes an image @img_name the MTD device defined by @mtd. @eb |
| * and @offs are the starting eraseblock and offset on the MTD device. Returns |
| * %0 in case of success and %-1 in case of failure. |
| */ |
| int mtd_write_img(const struct mtd_dev_info *mtd, int fd, int eb, int offs, |
| const char *img_name); |
| |
| /** |
| * 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__ */ |