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/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* MTD device concatenation layer definitions
*
* Copyright © 2002 Robert Kaiser <rkaiser@sysgo.de>
*/
#ifndef MTD_CONCAT_H
#define MTD_CONCAT_H
/*
* Our storage structure:
* Subdev points to an array of pointers to struct mtd_info objects
* which is allocated along with this structure
*
*/
struct mtd_concat {
struct mtd_info mtd;
int num_subdev;
struct mtd_info *subdev[];
};
struct mtd_info *mtd_concat_create(
struct mtd_info *subdev[], /* subdevices to concatenate */
int num_devs, /* number of subdevices */
const char *name); /* name for the new device */
void mtd_concat_destroy(struct mtd_info *mtd);
/**
* mtd_virt_concat_node_create - Create a component for concatenation
*
* Returns a positive number representing the no. of devices found for
* concatenation, or a negative error code.
*
* List all the devices for concatenations found in DT and create a
* component for concatenation.
*/
int mtd_virt_concat_node_create(void);
/**
* mtd_virt_concat_add - add mtd_info object to the list of subdevices for concatenation
* @mtd: pointer to new MTD device info structure
*
* Returns true if the mtd_info object is added successfully else returns false.
*
* The mtd_info object is added to the list of subdevices for concatenation.
* It returns true if a match is found, and false if all subdevices have
* already been added or if the mtd_info object does not match any of the
* intended MTD devices.
*/
bool mtd_virt_concat_add(struct mtd_info *mtd);
/**
* mtd_virt_concat_create_join - Create and register the concatenated MTD device
*
* Returns 0 on succes, or a negative error code.
*
* Creates and registers the concatenated MTD device
*/
int mtd_virt_concat_create_join(void);
/**
* mtd_virt_concat_destroy - Remove the concat that includes a specific mtd device
* as one of its components.
* @mtd: pointer to MTD device info structure.
*
* Returns 0 on succes, or a negative error code.
*
* If the mtd_info object is part of a concatenated device, all other MTD devices
* within that concat are registered individually. The concatenated device is then
* removed, along with its concatenation component.
*
*/
int mtd_virt_concat_destroy(struct mtd_info *mtd);
void mtd_virt_concat_destroy_joins(void);
void mtd_virt_concat_destroy_items(void);
#endif
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