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/*
* mtdram - a test mtd device
* $Id: mtdram.c,v 1.13 2000/07/03 10:01:38 dwmw2 Exp $
* Author: Alexander Larsson <alex@cendio.se>
*
* Copyright (c) 1999 Alexander Larsson <alex@cendio.se>
*
* This code is GPL
*
*/
#include <linux/module.h>
#include <linux/malloc.h>
#include <linux/ioport.h>
#include <linux/mtd/compatmac.h>
#include <linux/mtd/mtd.h>
#define MTDRAM_TOTAL_SIZE 1024*1024*8
#define MTDRAM_ERASE_SIZE 4*1024
// We could store these in the mtd structure, but we only support 1 device..
static struct mtd_info *mtd_info;
static int
ram_erase(struct mtd_info *mtd, struct erase_info *instr)
{
if (instr->addr + instr->len > mtd->size)
return -EINVAL;
memset((char *)mtd->priv + instr->addr, 0xff, instr->len);
instr->state = MTD_ERASE_DONE;
if (instr->callback)
(*(instr->callback))(instr);
return 0;
}
static int ram_point (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char **mtdbuf)
{
if (from + len > mtd->size)
return -EINVAL;
*mtdbuf = mtd->priv + from;
*retlen = len;
return 0;
}
static void ram_unpoint (struct mtd_info *mtd, u_char *addr)
{
}
static int ram_read(struct mtd_info *mtd, loff_t from, size_t len,
size_t *retlen, u_char *buf)
{
if (from + len > mtd->size)
return -EINVAL;
memcpy(buf, mtd->priv + from, len);
*retlen=len;
return 0;
}
static int ram_write(struct mtd_info *mtd, loff_t to, size_t len,
size_t *retlen, const u_char *buf)
{
if (to + len > mtd->size)
return -EINVAL;
memcpy ((char *)mtd->priv + to, buf, len);
*retlen=len;
return 0;
}
#if LINUX_VERSION_CODE < 0x20300
#ifdef MODULE
#define init_mtdram init_module
#define cleanup_mtdram cleanup_module
#endif
#endif
//static void __exit cleanup_mtdram(void)
mod_exit_t cleanup_mtdram(void)
{
if (mtd_info) {
del_mtd_device(mtd_info);
if (mtd_info->priv)
vfree(mtd_info->priv);
kfree(mtd_info);
}
}
extern struct module __this_module;
mod_init_t init_mtdram(void)
{
// Allocate some memory
mtd_info = (struct mtd_info *)kmalloc(sizeof(struct mtd_info), GFP_KERNEL);
if (mtd_info == 0)
return 0;
memset(mtd_info, 0, sizeof(*mtd_info));
// Setup the MTD structure
mtd_info->name = "mtdram test device";
mtd_info->type = MTD_RAM;
mtd_info->flags = MTD_CAP_RAM;
mtd_info->size = MTDRAM_TOTAL_SIZE;
mtd_info->erasesize = MTDRAM_ERASE_SIZE;
mtd_info->priv = vmalloc(MTDRAM_TOTAL_SIZE);
memset(mtd_info->priv, 0xff, MTDRAM_TOTAL_SIZE);
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,2,0)
mtd_info->module = THIS_MODULE;
#endif
if (!mtd_info->priv) {
kfree(mtd_info);
mtd_info = NULL;
return -ENOMEM;
}
mtd_info->erase = ram_erase;
mtd_info->point = ram_point;
mtd_info->unpoint = ram_unpoint;
mtd_info->read = ram_read;
mtd_info->write = ram_write;
if (add_mtd_device(mtd_info)) {
vfree(mtd_info->priv);
kfree(mtd_info);
mtd_info = NULL;
return -EIO;
}
return 0;
}
#if LINUX_VERSION_CODE > 0x20300
module_init(init_mtdram);
module_exit(cleanup_mtdram);
#endif
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