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mtd: introduce mtd_device_(un)register()

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To prepare for the removal of add_mtd_device and add_mtd_partitions(),
introduce mtd_device_register().  This will create partitions if they
are supplied or register the whole device if there are no partitions.

Once all drivers are converted to use mtd_device_register(),
add_mtd_device() and add_mtd_partitions() will be made internal only.

v2: move kerneldoc to implementation file and fixup some kerneldoc
warnings.

Artem: tweak comments: remove junk tabs, use dots consistently.

Signed-off-by: Jamie Iles <jamie@jamieiles.com>
Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
This commit is contained in:
Jamie Iles 2011-05-23 17:15:46 +01:00 committed by David Woodhouse
parent 5fcb033159
commit f5671ab3f6
3 changed files with 52 additions and 1 deletions
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45
drivers/mtd/mtdcore.c
View File

@ -38,6 +38,7 @@
#include <linux/gfp.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/partitions.h>
#include "mtdcore.h"
/*
@ -427,6 +428,50 @@ int del_mtd_device (struct mtd_info *mtd)
return ret;
}
/**
* mtd_device_register - register an MTD device.
*
* @master: the MTD device to register
* @parts: the partitions to register - only valid if nr_parts > 0
* @nr_parts: the number of partitions in parts. If zero then the full MTD
* device is registered
*
* Register an MTD device with the system and optionally, a number of
* partitions. If nr_parts is 0 then the whole device is registered, otherwise
* only the partitions are registered. To register both the full device *and*
* the partitions, call mtd_device_register() twice, once with nr_parts == 0
* and once equal to the number of partitions.
*/
int mtd_device_register(struct mtd_info *master,
const struct mtd_partition *parts,
int nr_parts)
{
return parts ? add_mtd_partitions(master, parts, nr_parts) :
add_mtd_device(master);
}
EXPORT_SYMBOL_GPL(mtd_device_register);
/**
* mtd_device_unregister - unregister an existing MTD device.
*
* @master: the MTD device to unregister. This will unregister both the master
* and any partitions if registered.
*/
int mtd_device_unregister(struct mtd_info *master)
{
int err;
err = del_mtd_partitions(master);
if (err)
return err;
if (!device_is_registered(&master->dev))
return 0;
return del_mtd_device(master);
}
EXPORT_SYMBOL_GPL(mtd_device_unregister);
/**
* register_mtd_user - register a 'user' of MTD devices.
* @new: pointer to notifier info structure

6
include/linux/mtd/mtd.h
View File

@ -325,6 +325,12 @@ static inline uint32_t mtd_mod_by_ws(uint64_t sz, struct mtd_info *mtd)
extern int add_mtd_device(struct mtd_info *mtd);
extern int del_mtd_device (struct mtd_info *mtd);
struct mtd_partition;
extern int mtd_device_register(struct mtd_info *master,
const struct mtd_partition *parts,
int nr_parts);
extern int mtd_device_unregister(struct mtd_info *master);
extern struct mtd_info *get_mtd_device(struct mtd_info *mtd, int num);
extern int __get_mtd_device(struct mtd_info *mtd);
extern void __put_mtd_device(struct mtd_info *mtd);

2
include/linux/mtd/partitions.h
View File

@ -16,7 +16,7 @@
* Partition definition structure:
*
* An array of struct partition is passed along with a MTD object to
* add_mtd_partitions() to create them.
* mtd_device_register() to create them.
*
* For each partition, these fields are available:
* name: string that will be used to label the partition's MTD device.