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/*
* $Id: mtdcore.c,v 1.8 2000/06/27 13:40:05 dwmw2 Exp $
*
* Core registration and callback routines for MTD
* drivers and users.
*
*/
#ifdef MTD_DEBUG
#define DEBUGLVL debug
#endif
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/ptrace.h>
#include <linux/malloc.h>
#include <linux/string.h>
#include <linux/timer.h>
#include <linux/major.h>
#include <linux/fs.h>
#include <linux/ioctl.h>
#include <stdarg.h>
#include <linux/mtd/compatmac.h>
#ifdef CONFIG_PROC_FS
#include <linux/proc_fs.h>
#endif
#include <linux/mtd/mtd.h>
#ifdef MTD_DEBUG
static int debug = MTD_DEBUG;
MODULE_PARM(debug, "i");
#endif
/* Init code required for 2.2 kernels */
#if LINUX_VERSION_CODE < 0x20300
#ifdef CONFIG_MTD_DOC1000
extern int init_doc1000(void);
#endif
#ifdef CONFIG_MTD_DOCPROBE
extern int init_doc(void);
#endif
#ifdef CONFIG_MTD_OCTAGON
extern int init_octagon5066(void);
#endif
#ifdef CONFIG_MTD_VMAX
extern int init_vmax301(void);
#endif
#ifdef CONFIG_MTD_MIXMEM
extern int init_mixmem(void);
#endif
#ifdef CONFIG_MTD_PMC551
extern int init_pmc551(void);
#endif
#ifdef CONFIG_MTD_NORA
extern int init_nora(void);
#endif
#ifdef CONFIG_FTL
extern int init_ftl(void);
#endif
#ifdef CONFIG_NFTL
extern int init_nftl(void);
#endif
#ifdef CONFIG_MTD_BLOCK
extern int init_mtdblock(void);
#endif
#ifdef CONFIG_MTD_CHAR
extern int init_mtdchar(void);
#endif
#endif /* LINUX_VERSION_CODE < 0x20300 */
static DECLARE_MUTEX(mtd_table_mutex);
static struct mtd_info *mtd_table[MAX_MTD_DEVICES];
static struct mtd_notifier *mtd_notifiers = NULL;
int add_mtd_device(struct mtd_info *mtd)
{
int i;
down(&mtd_table_mutex);
for (i=0; i< MAX_MTD_DEVICES; i++)
if (!mtd_table[i])
{
struct mtd_notifier *not=mtd_notifiers;
mtd_table[i] = mtd;
DEBUG(0, "mtd: Giving out device %d to %s\n",i, mtd->name);
while (not)
{
(*(not->add))(mtd);
not = not->next;
}
up(&mtd_table_mutex);
MOD_INC_USE_COUNT;
return 0;
}
up(&mtd_table_mutex);
return 1;
}
int del_mtd_device (struct mtd_info *mtd)
{
struct mtd_notifier *not=mtd_notifiers;
int i;
down(&mtd_table_mutex);
for (i=0; i < MAX_MTD_DEVICES; i++)
{
if (mtd_table[i] == mtd)
{
while (not)
{
(*(not->remove))(mtd);
not = not->next;
}
mtd_table[i] = NULL;
up (&mtd_table_mutex);
MOD_DEC_USE_COUNT;
return 0;
}
}
up(&mtd_table_mutex);
return 1;
}
void register_mtd_user (struct mtd_notifier *new)
{
int i;
down(&mtd_table_mutex);
new->next = mtd_notifiers;
mtd_notifiers = new;
MOD_INC_USE_COUNT;
for (i=0; i< MAX_MTD_DEVICES; i++)
if (mtd_table[i])
new->add(mtd_table[i]);
up(&mtd_table_mutex);
}
int unregister_mtd_user (struct mtd_notifier *old)
{
struct mtd_notifier **prev = &mtd_notifiers;
struct mtd_notifier *cur;
int i;
down(&mtd_table_mutex);
while ((cur = *prev)) {
if (cur == old) {
*prev = cur->next;
MOD_DEC_USE_COUNT;
for (i=0; i< MAX_MTD_DEVICES; i++)
if (mtd_table[i])
old->remove(mtd_table[i]);
up(&mtd_table_mutex);
return 0;
}
prev = &cur->next;
}
up(&mtd_table_mutex);
return 1;
}
/* get_mtd_device():
* Prepare to use an MTD device referenced either by number or address.
*
* If <num> == -1, search the table for an MTD device located at <mtd>.
* If <mtd> == NULL, return the MTD device with number <num>.
* If both are set, return the MTD device with number <num> _only_ if it
* is located at <mtd>.
*/
struct mtd_info *__get_mtd_device(struct mtd_info *mtd, int num)
{
struct mtd_info *ret = NULL;
int i;
down(&mtd_table_mutex);
if (num == -1) {
for (i=0; i< MAX_MTD_DEVICES; i++)
if (mtd_table[i] == mtd)
ret = mtd_table[i];
} else if (num < MAX_MTD_DEVICES) {
ret = mtd_table[num];
if (mtd && mtd != ret)
ret = NULL;
}
up(&mtd_table_mutex);
return ret;
}
EXPORT_SYMBOL(add_mtd_device);
EXPORT_SYMBOL(del_mtd_device);
EXPORT_SYMBOL(__get_mtd_device);
EXPORT_SYMBOL(register_mtd_user);
EXPORT_SYMBOL(unregister_mtd_user);
/*====================================================================*/
/* /proc/mtd support */
#ifdef CONFIG_PROC_FS
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,2,0)
struct proc_dir_entry *proc_mtd;
#endif
static inline int mtd_proc_info (char *buf, int i)
{
struct mtd_info *this = mtd_table[i];
if (!this)
return 0;
return sprintf(buf, "mtd%d: %8.8lx \"%s\"\n", i, this->size,
this->name);
}
static int mtd_read_proc ( char *page, char **start, off_t off,int count
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,2,0)
,int *eof, void *data_unused
#else
,int unused
#endif
)
{
int len = 0, l, i;
off_t begin = 0;
down(&mtd_table_mutex);
for (i=0; i< MAX_MTD_DEVICES; i++) {
l = mtd_proc_info(page + len, i);
len += l;
if (len+begin > off+count)
goto done;
if (len+begin < off) {
begin += len;
len = 0;
}
}
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,2,0)
*eof = 1;
#endif
done:
up(&mtd_table_mutex);
if (off >= len+begin)
return 0;
*start = page + (begin-off);
return ((count < begin+len-off) ? count : begin+len-off);
}
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,2,0)
struct proc_dir_entry mtd_proc_entry = {
0, /* low_ino: the inode -- dynamic */
3, "mtd", /* len of name and name */
S_IFREG | S_IRUGO, /* mode */
1, 0, 0, /* nlinks, owner, group */
0, NULL, /* size - unused; operations -- use default */
&mtd_read_proc, /* function used to read data */
/* nothing more */
};
#endif
#endif
/*====================================================================*/
#if LINUX_VERSION_CODE < 0x20300
static inline void init_others(void)
{
/* Shedloads of calls to init functions of all the
* other drivers and users of MTD, which we can
* ditch in 2.3 because of the sexy new way of
* finding init routines.
*/
#ifdef CONFIG_MTD_DOC1000
init_doc1000();
#endif
#ifdef CONFIG_MTD_DOCPROBE
init_doc(); /* This covers both the DiskOnChip 2000
* and the DiskOnChip Millennium.
* Theoretically all other DiskOnChip
* devices too. */
#endif
#ifdef CONFIG_MTD_OCTAGON
init_octagon5066();
#endif
#ifdef CONFIG_MTD_VMAX
init_vmax301();
#endif
#ifdef CONFIGF_MTD_MIXMEM
init_mixmem();
#endif
#ifdef CONFIG_MTD_PMC551
init_pmc551();
#endif
#ifdef CONFIG_MTD_NORA
init_nora();
#endif
#ifdef CONFIG_MTD_MTDRAM
init_mtdram();
#endif
#ifdef CONFIG_FTL
init_ftl();
#endif
#ifdef CONFIG_NFTL
init_nftl();
#endif
#ifdef CONFIG_MTD_BLOCK
init_mtdblock();
#endif
#ifdef CONFIG_MTD_CHAR
init_mtdchar();
#endif
}
#ifdef MODULE
#define init_mtd init_module
#define cleanup_mtd cleanup_module
#endif
#endif /* LINUX_VERSION_CODE < 0x20300 */
mod_init_t init_mtd(void)
{
int i;
DEBUG(1, "INIT_MTD:\n");
for (i=0; i<MAX_MTD_DEVICES; i++)
mtd_table[i]=NULL;
#ifdef CONFIG_PROC_FS
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,2,0)
if ((proc_mtd = create_proc_entry( "mtd", 0, 0 )))
proc_mtd->read_proc = mtd_read_proc;
#else
proc_register_dynamic(&proc_root,&mtd_proc_entry);
#endif
#endif
#if LINUX_VERSION_CODE < 0x20300
init_others();
#endif
return 0;
}
mod_exit_t cleanup_mtd(void)
{
unregister_chrdev(MTD_CHAR_MAJOR, "mtd");
#ifdef CONFIG_PROC_FS
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,2,0)
if (proc_mtd)
remove_proc_entry( "mtd", 0);
#else
proc_unregister(&proc_root,mtd_proc_entry.low_ino);
#endif
#endif
}
#if LINUX_VERSION_CODE > 0x20300
module_init(init_mtd);
module_exit(cleanup_mtd);
#endif
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