forked from Minki/linux
25985edced
Fixes generated by 'codespell' and manually reviewed. Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
1218 lines
26 KiB
C
1218 lines
26 KiB
C
/*
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* Copyright © 1999-2010 David Woodhouse <dwmw2@infradead.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*/
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#include <linux/device.h>
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#include <linux/fs.h>
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#include <linux/mm.h>
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#include <linux/err.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/sched.h>
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#include <linux/mutex.h>
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#include <linux/backing-dev.h>
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#include <linux/compat.h>
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#include <linux/mount.h>
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#include <linux/blkpg.h>
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#include <linux/mtd/mtd.h>
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#include <linux/mtd/partitions.h>
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#include <linux/mtd/map.h>
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#include <asm/uaccess.h>
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#define MTD_INODE_FS_MAGIC 0x11307854
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static DEFINE_MUTEX(mtd_mutex);
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static struct vfsmount *mtd_inode_mnt __read_mostly;
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/*
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* Data structure to hold the pointer to the mtd device as well
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* as mode information ofr various use cases.
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*/
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struct mtd_file_info {
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struct mtd_info *mtd;
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struct inode *ino;
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enum mtd_file_modes mode;
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};
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static loff_t mtd_lseek (struct file *file, loff_t offset, int orig)
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{
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struct mtd_file_info *mfi = file->private_data;
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struct mtd_info *mtd = mfi->mtd;
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switch (orig) {
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case SEEK_SET:
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break;
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case SEEK_CUR:
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offset += file->f_pos;
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break;
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case SEEK_END:
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offset += mtd->size;
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break;
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default:
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return -EINVAL;
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}
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if (offset >= 0 && offset <= mtd->size)
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return file->f_pos = offset;
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return -EINVAL;
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}
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static int mtd_open(struct inode *inode, struct file *file)
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{
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int minor = iminor(inode);
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int devnum = minor >> 1;
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int ret = 0;
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struct mtd_info *mtd;
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struct mtd_file_info *mfi;
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struct inode *mtd_ino;
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DEBUG(MTD_DEBUG_LEVEL0, "MTD_open\n");
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/* You can't open the RO devices RW */
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if ((file->f_mode & FMODE_WRITE) && (minor & 1))
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return -EACCES;
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mutex_lock(&mtd_mutex);
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mtd = get_mtd_device(NULL, devnum);
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if (IS_ERR(mtd)) {
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ret = PTR_ERR(mtd);
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goto out;
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}
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if (mtd->type == MTD_ABSENT) {
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put_mtd_device(mtd);
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ret = -ENODEV;
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goto out;
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}
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mtd_ino = iget_locked(mtd_inode_mnt->mnt_sb, devnum);
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if (!mtd_ino) {
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put_mtd_device(mtd);
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ret = -ENOMEM;
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goto out;
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}
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if (mtd_ino->i_state & I_NEW) {
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mtd_ino->i_private = mtd;
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mtd_ino->i_mode = S_IFCHR;
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mtd_ino->i_data.backing_dev_info = mtd->backing_dev_info;
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unlock_new_inode(mtd_ino);
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}
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file->f_mapping = mtd_ino->i_mapping;
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/* You can't open it RW if it's not a writeable device */
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if ((file->f_mode & FMODE_WRITE) && !(mtd->flags & MTD_WRITEABLE)) {
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iput(mtd_ino);
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put_mtd_device(mtd);
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ret = -EACCES;
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goto out;
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}
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mfi = kzalloc(sizeof(*mfi), GFP_KERNEL);
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if (!mfi) {
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iput(mtd_ino);
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put_mtd_device(mtd);
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ret = -ENOMEM;
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goto out;
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}
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mfi->ino = mtd_ino;
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mfi->mtd = mtd;
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file->private_data = mfi;
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out:
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mutex_unlock(&mtd_mutex);
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return ret;
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} /* mtd_open */
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/*====================================================================*/
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static int mtd_close(struct inode *inode, struct file *file)
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{
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struct mtd_file_info *mfi = file->private_data;
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struct mtd_info *mtd = mfi->mtd;
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DEBUG(MTD_DEBUG_LEVEL0, "MTD_close\n");
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/* Only sync if opened RW */
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if ((file->f_mode & FMODE_WRITE) && mtd->sync)
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mtd->sync(mtd);
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iput(mfi->ino);
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put_mtd_device(mtd);
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file->private_data = NULL;
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kfree(mfi);
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return 0;
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} /* mtd_close */
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/* FIXME: This _really_ needs to die. In 2.5, we should lock the
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userspace buffer down and use it directly with readv/writev.
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*/
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#define MAX_KMALLOC_SIZE 0x20000
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static ssize_t mtd_read(struct file *file, char __user *buf, size_t count,loff_t *ppos)
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{
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struct mtd_file_info *mfi = file->private_data;
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struct mtd_info *mtd = mfi->mtd;
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size_t retlen=0;
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size_t total_retlen=0;
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int ret=0;
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int len;
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char *kbuf;
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DEBUG(MTD_DEBUG_LEVEL0,"MTD_read\n");
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if (*ppos + count > mtd->size)
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count = mtd->size - *ppos;
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if (!count)
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return 0;
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/* FIXME: Use kiovec in 2.5 to lock down the user's buffers
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and pass them directly to the MTD functions */
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if (count > MAX_KMALLOC_SIZE)
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kbuf=kmalloc(MAX_KMALLOC_SIZE, GFP_KERNEL);
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else
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kbuf=kmalloc(count, GFP_KERNEL);
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if (!kbuf)
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return -ENOMEM;
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while (count) {
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if (count > MAX_KMALLOC_SIZE)
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len = MAX_KMALLOC_SIZE;
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else
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len = count;
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switch (mfi->mode) {
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case MTD_MODE_OTP_FACTORY:
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ret = mtd->read_fact_prot_reg(mtd, *ppos, len, &retlen, kbuf);
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break;
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case MTD_MODE_OTP_USER:
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ret = mtd->read_user_prot_reg(mtd, *ppos, len, &retlen, kbuf);
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break;
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case MTD_MODE_RAW:
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{
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struct mtd_oob_ops ops;
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ops.mode = MTD_OOB_RAW;
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ops.datbuf = kbuf;
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ops.oobbuf = NULL;
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ops.len = len;
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ret = mtd->read_oob(mtd, *ppos, &ops);
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retlen = ops.retlen;
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break;
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}
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default:
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ret = mtd->read(mtd, *ppos, len, &retlen, kbuf);
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}
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/* Nand returns -EBADMSG on ecc errors, but it returns
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* the data. For our userspace tools it is important
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* to dump areas with ecc errors !
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* For kernel internal usage it also might return -EUCLEAN
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* to signal the caller that a bitflip has occurred and has
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* been corrected by the ECC algorithm.
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* Userspace software which accesses NAND this way
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* must be aware of the fact that it deals with NAND
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*/
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if (!ret || (ret == -EUCLEAN) || (ret == -EBADMSG)) {
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*ppos += retlen;
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if (copy_to_user(buf, kbuf, retlen)) {
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kfree(kbuf);
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return -EFAULT;
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}
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else
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total_retlen += retlen;
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count -= retlen;
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buf += retlen;
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if (retlen == 0)
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count = 0;
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}
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else {
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kfree(kbuf);
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return ret;
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}
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}
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kfree(kbuf);
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return total_retlen;
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} /* mtd_read */
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static ssize_t mtd_write(struct file *file, const char __user *buf, size_t count,loff_t *ppos)
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{
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struct mtd_file_info *mfi = file->private_data;
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struct mtd_info *mtd = mfi->mtd;
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char *kbuf;
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size_t retlen;
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size_t total_retlen=0;
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int ret=0;
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int len;
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DEBUG(MTD_DEBUG_LEVEL0,"MTD_write\n");
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if (*ppos == mtd->size)
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return -ENOSPC;
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if (*ppos + count > mtd->size)
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count = mtd->size - *ppos;
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if (!count)
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return 0;
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if (count > MAX_KMALLOC_SIZE)
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kbuf=kmalloc(MAX_KMALLOC_SIZE, GFP_KERNEL);
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else
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kbuf=kmalloc(count, GFP_KERNEL);
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if (!kbuf)
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return -ENOMEM;
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while (count) {
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if (count > MAX_KMALLOC_SIZE)
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len = MAX_KMALLOC_SIZE;
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else
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len = count;
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if (copy_from_user(kbuf, buf, len)) {
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kfree(kbuf);
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return -EFAULT;
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}
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switch (mfi->mode) {
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case MTD_MODE_OTP_FACTORY:
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ret = -EROFS;
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break;
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case MTD_MODE_OTP_USER:
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if (!mtd->write_user_prot_reg) {
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ret = -EOPNOTSUPP;
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break;
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}
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ret = mtd->write_user_prot_reg(mtd, *ppos, len, &retlen, kbuf);
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break;
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case MTD_MODE_RAW:
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{
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struct mtd_oob_ops ops;
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ops.mode = MTD_OOB_RAW;
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ops.datbuf = kbuf;
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ops.oobbuf = NULL;
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ops.len = len;
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ret = mtd->write_oob(mtd, *ppos, &ops);
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retlen = ops.retlen;
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break;
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}
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default:
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ret = (*(mtd->write))(mtd, *ppos, len, &retlen, kbuf);
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}
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if (!ret) {
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*ppos += retlen;
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total_retlen += retlen;
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count -= retlen;
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buf += retlen;
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}
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else {
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kfree(kbuf);
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return ret;
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}
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}
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kfree(kbuf);
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return total_retlen;
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} /* mtd_write */
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/*======================================================================
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IOCTL calls for getting device parameters.
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======================================================================*/
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static void mtdchar_erase_callback (struct erase_info *instr)
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{
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wake_up((wait_queue_head_t *)instr->priv);
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}
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#ifdef CONFIG_HAVE_MTD_OTP
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static int otp_select_filemode(struct mtd_file_info *mfi, int mode)
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{
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struct mtd_info *mtd = mfi->mtd;
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int ret = 0;
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switch (mode) {
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case MTD_OTP_FACTORY:
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if (!mtd->read_fact_prot_reg)
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ret = -EOPNOTSUPP;
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else
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mfi->mode = MTD_MODE_OTP_FACTORY;
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break;
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case MTD_OTP_USER:
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if (!mtd->read_fact_prot_reg)
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ret = -EOPNOTSUPP;
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else
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mfi->mode = MTD_MODE_OTP_USER;
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break;
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default:
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ret = -EINVAL;
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case MTD_OTP_OFF:
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break;
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}
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return ret;
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}
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#else
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# define otp_select_filemode(f,m) -EOPNOTSUPP
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#endif
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static int mtd_do_writeoob(struct file *file, struct mtd_info *mtd,
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uint64_t start, uint32_t length, void __user *ptr,
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uint32_t __user *retp)
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{
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struct mtd_oob_ops ops;
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uint32_t retlen;
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int ret = 0;
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if (!(file->f_mode & FMODE_WRITE))
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return -EPERM;
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if (length > 4096)
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return -EINVAL;
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if (!mtd->write_oob)
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ret = -EOPNOTSUPP;
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else
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ret = access_ok(VERIFY_READ, ptr, length) ? 0 : -EFAULT;
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if (ret)
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return ret;
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ops.ooblen = length;
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ops.ooboffs = start & (mtd->oobsize - 1);
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ops.datbuf = NULL;
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ops.mode = MTD_OOB_PLACE;
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if (ops.ooboffs && ops.ooblen > (mtd->oobsize - ops.ooboffs))
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return -EINVAL;
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ops.oobbuf = memdup_user(ptr, length);
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if (IS_ERR(ops.oobbuf))
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return PTR_ERR(ops.oobbuf);
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start &= ~((uint64_t)mtd->oobsize - 1);
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ret = mtd->write_oob(mtd, start, &ops);
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if (ops.oobretlen > 0xFFFFFFFFU)
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ret = -EOVERFLOW;
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retlen = ops.oobretlen;
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if (copy_to_user(retp, &retlen, sizeof(length)))
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ret = -EFAULT;
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kfree(ops.oobbuf);
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return ret;
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}
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static int mtd_do_readoob(struct mtd_info *mtd, uint64_t start,
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uint32_t length, void __user *ptr, uint32_t __user *retp)
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{
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struct mtd_oob_ops ops;
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int ret = 0;
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if (length > 4096)
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return -EINVAL;
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if (!mtd->read_oob)
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ret = -EOPNOTSUPP;
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else
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ret = access_ok(VERIFY_WRITE, ptr,
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length) ? 0 : -EFAULT;
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if (ret)
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return ret;
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ops.ooblen = length;
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ops.ooboffs = start & (mtd->oobsize - 1);
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ops.datbuf = NULL;
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ops.mode = MTD_OOB_PLACE;
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if (ops.ooboffs && ops.ooblen > (mtd->oobsize - ops.ooboffs))
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return -EINVAL;
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ops.oobbuf = kmalloc(length, GFP_KERNEL);
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if (!ops.oobbuf)
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return -ENOMEM;
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start &= ~((uint64_t)mtd->oobsize - 1);
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ret = mtd->read_oob(mtd, start, &ops);
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if (put_user(ops.oobretlen, retp))
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ret = -EFAULT;
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else if (ops.oobretlen && copy_to_user(ptr, ops.oobbuf,
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ops.oobretlen))
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ret = -EFAULT;
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kfree(ops.oobbuf);
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return ret;
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}
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|
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/*
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* Copies (and truncates, if necessary) data from the larger struct,
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* nand_ecclayout, to the smaller, deprecated layout struct,
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* nand_ecclayout_user. This is necessary only to suppport the deprecated
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* API ioctl ECCGETLAYOUT while allowing all new functionality to use
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* nand_ecclayout flexibly (i.e. the struct may change size in new
|
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* releases without requiring major rewrites).
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*/
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static int shrink_ecclayout(const struct nand_ecclayout *from,
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struct nand_ecclayout_user *to)
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{
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int i;
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if (!from || !to)
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return -EINVAL;
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memset(to, 0, sizeof(*to));
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to->eccbytes = min((int)from->eccbytes, MTD_MAX_ECCPOS_ENTRIES);
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for (i = 0; i < to->eccbytes; i++)
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to->eccpos[i] = from->eccpos[i];
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for (i = 0; i < MTD_MAX_OOBFREE_ENTRIES; i++) {
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if (from->oobfree[i].length == 0 &&
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from->oobfree[i].offset == 0)
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break;
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to->oobavail += from->oobfree[i].length;
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to->oobfree[i] = from->oobfree[i];
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}
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return 0;
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}
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|
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#ifdef CONFIG_MTD_PARTITIONS
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static int mtd_blkpg_ioctl(struct mtd_info *mtd,
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struct blkpg_ioctl_arg __user *arg)
|
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{
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struct blkpg_ioctl_arg a;
|
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struct blkpg_partition p;
|
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|
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if (!capable(CAP_SYS_ADMIN))
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return -EPERM;
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|
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if (copy_from_user(&a, arg, sizeof(struct blkpg_ioctl_arg)))
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return -EFAULT;
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|
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if (copy_from_user(&p, a.data, sizeof(struct blkpg_partition)))
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return -EFAULT;
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|
|
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switch (a.op) {
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|
case BLKPG_ADD_PARTITION:
|
|
|
|
/* Only master mtd device must be used to add partitions */
|
|
if (mtd_is_partition(mtd))
|
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return -EINVAL;
|
|
|
|
return mtd_add_partition(mtd, p.devname, p.start, p.length);
|
|
|
|
case BLKPG_DEL_PARTITION:
|
|
|
|
if (p.pno < 0)
|
|
return -EINVAL;
|
|
|
|
return mtd_del_partition(mtd, p.pno);
|
|
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
|
|
static int mtd_ioctl(struct file *file, u_int cmd, u_long arg)
|
|
{
|
|
struct mtd_file_info *mfi = file->private_data;
|
|
struct mtd_info *mtd = mfi->mtd;
|
|
void __user *argp = (void __user *)arg;
|
|
int ret = 0;
|
|
u_long size;
|
|
struct mtd_info_user info;
|
|
|
|
DEBUG(MTD_DEBUG_LEVEL0, "MTD_ioctl\n");
|
|
|
|
size = (cmd & IOCSIZE_MASK) >> IOCSIZE_SHIFT;
|
|
if (cmd & IOC_IN) {
|
|
if (!access_ok(VERIFY_READ, argp, size))
|
|
return -EFAULT;
|
|
}
|
|
if (cmd & IOC_OUT) {
|
|
if (!access_ok(VERIFY_WRITE, argp, size))
|
|
return -EFAULT;
|
|
}
|
|
|
|
switch (cmd) {
|
|
case MEMGETREGIONCOUNT:
|
|
if (copy_to_user(argp, &(mtd->numeraseregions), sizeof(int)))
|
|
return -EFAULT;
|
|
break;
|
|
|
|
case MEMGETREGIONINFO:
|
|
{
|
|
uint32_t ur_idx;
|
|
struct mtd_erase_region_info *kr;
|
|
struct region_info_user __user *ur = argp;
|
|
|
|
if (get_user(ur_idx, &(ur->regionindex)))
|
|
return -EFAULT;
|
|
|
|
if (ur_idx >= mtd->numeraseregions)
|
|
return -EINVAL;
|
|
|
|
kr = &(mtd->eraseregions[ur_idx]);
|
|
|
|
if (put_user(kr->offset, &(ur->offset))
|
|
|| put_user(kr->erasesize, &(ur->erasesize))
|
|
|| put_user(kr->numblocks, &(ur->numblocks)))
|
|
return -EFAULT;
|
|
|
|
break;
|
|
}
|
|
|
|
case MEMGETINFO:
|
|
memset(&info, 0, sizeof(info));
|
|
info.type = mtd->type;
|
|
info.flags = mtd->flags;
|
|
info.size = mtd->size;
|
|
info.erasesize = mtd->erasesize;
|
|
info.writesize = mtd->writesize;
|
|
info.oobsize = mtd->oobsize;
|
|
/* The below fields are obsolete */
|
|
info.ecctype = -1;
|
|
if (copy_to_user(argp, &info, sizeof(struct mtd_info_user)))
|
|
return -EFAULT;
|
|
break;
|
|
|
|
case MEMERASE:
|
|
case MEMERASE64:
|
|
{
|
|
struct erase_info *erase;
|
|
|
|
if(!(file->f_mode & FMODE_WRITE))
|
|
return -EPERM;
|
|
|
|
erase=kzalloc(sizeof(struct erase_info),GFP_KERNEL);
|
|
if (!erase)
|
|
ret = -ENOMEM;
|
|
else {
|
|
wait_queue_head_t waitq;
|
|
DECLARE_WAITQUEUE(wait, current);
|
|
|
|
init_waitqueue_head(&waitq);
|
|
|
|
if (cmd == MEMERASE64) {
|
|
struct erase_info_user64 einfo64;
|
|
|
|
if (copy_from_user(&einfo64, argp,
|
|
sizeof(struct erase_info_user64))) {
|
|
kfree(erase);
|
|
return -EFAULT;
|
|
}
|
|
erase->addr = einfo64.start;
|
|
erase->len = einfo64.length;
|
|
} else {
|
|
struct erase_info_user einfo32;
|
|
|
|
if (copy_from_user(&einfo32, argp,
|
|
sizeof(struct erase_info_user))) {
|
|
kfree(erase);
|
|
return -EFAULT;
|
|
}
|
|
erase->addr = einfo32.start;
|
|
erase->len = einfo32.length;
|
|
}
|
|
erase->mtd = mtd;
|
|
erase->callback = mtdchar_erase_callback;
|
|
erase->priv = (unsigned long)&waitq;
|
|
|
|
/*
|
|
FIXME: Allow INTERRUPTIBLE. Which means
|
|
not having the wait_queue head on the stack.
|
|
|
|
If the wq_head is on the stack, and we
|
|
leave because we got interrupted, then the
|
|
wq_head is no longer there when the
|
|
callback routine tries to wake us up.
|
|
*/
|
|
ret = mtd->erase(mtd, erase);
|
|
if (!ret) {
|
|
set_current_state(TASK_UNINTERRUPTIBLE);
|
|
add_wait_queue(&waitq, &wait);
|
|
if (erase->state != MTD_ERASE_DONE &&
|
|
erase->state != MTD_ERASE_FAILED)
|
|
schedule();
|
|
remove_wait_queue(&waitq, &wait);
|
|
set_current_state(TASK_RUNNING);
|
|
|
|
ret = (erase->state == MTD_ERASE_FAILED)?-EIO:0;
|
|
}
|
|
kfree(erase);
|
|
}
|
|
break;
|
|
}
|
|
|
|
case MEMWRITEOOB:
|
|
{
|
|
struct mtd_oob_buf buf;
|
|
struct mtd_oob_buf __user *buf_user = argp;
|
|
|
|
/* NOTE: writes return length to buf_user->length */
|
|
if (copy_from_user(&buf, argp, sizeof(buf)))
|
|
ret = -EFAULT;
|
|
else
|
|
ret = mtd_do_writeoob(file, mtd, buf.start, buf.length,
|
|
buf.ptr, &buf_user->length);
|
|
break;
|
|
}
|
|
|
|
case MEMREADOOB:
|
|
{
|
|
struct mtd_oob_buf buf;
|
|
struct mtd_oob_buf __user *buf_user = argp;
|
|
|
|
/* NOTE: writes return length to buf_user->start */
|
|
if (copy_from_user(&buf, argp, sizeof(buf)))
|
|
ret = -EFAULT;
|
|
else
|
|
ret = mtd_do_readoob(mtd, buf.start, buf.length,
|
|
buf.ptr, &buf_user->start);
|
|
break;
|
|
}
|
|
|
|
case MEMWRITEOOB64:
|
|
{
|
|
struct mtd_oob_buf64 buf;
|
|
struct mtd_oob_buf64 __user *buf_user = argp;
|
|
|
|
if (copy_from_user(&buf, argp, sizeof(buf)))
|
|
ret = -EFAULT;
|
|
else
|
|
ret = mtd_do_writeoob(file, mtd, buf.start, buf.length,
|
|
(void __user *)(uintptr_t)buf.usr_ptr,
|
|
&buf_user->length);
|
|
break;
|
|
}
|
|
|
|
case MEMREADOOB64:
|
|
{
|
|
struct mtd_oob_buf64 buf;
|
|
struct mtd_oob_buf64 __user *buf_user = argp;
|
|
|
|
if (copy_from_user(&buf, argp, sizeof(buf)))
|
|
ret = -EFAULT;
|
|
else
|
|
ret = mtd_do_readoob(mtd, buf.start, buf.length,
|
|
(void __user *)(uintptr_t)buf.usr_ptr,
|
|
&buf_user->length);
|
|
break;
|
|
}
|
|
|
|
case MEMLOCK:
|
|
{
|
|
struct erase_info_user einfo;
|
|
|
|
if (copy_from_user(&einfo, argp, sizeof(einfo)))
|
|
return -EFAULT;
|
|
|
|
if (!mtd->lock)
|
|
ret = -EOPNOTSUPP;
|
|
else
|
|
ret = mtd->lock(mtd, einfo.start, einfo.length);
|
|
break;
|
|
}
|
|
|
|
case MEMUNLOCK:
|
|
{
|
|
struct erase_info_user einfo;
|
|
|
|
if (copy_from_user(&einfo, argp, sizeof(einfo)))
|
|
return -EFAULT;
|
|
|
|
if (!mtd->unlock)
|
|
ret = -EOPNOTSUPP;
|
|
else
|
|
ret = mtd->unlock(mtd, einfo.start, einfo.length);
|
|
break;
|
|
}
|
|
|
|
case MEMISLOCKED:
|
|
{
|
|
struct erase_info_user einfo;
|
|
|
|
if (copy_from_user(&einfo, argp, sizeof(einfo)))
|
|
return -EFAULT;
|
|
|
|
if (!mtd->is_locked)
|
|
ret = -EOPNOTSUPP;
|
|
else
|
|
ret = mtd->is_locked(mtd, einfo.start, einfo.length);
|
|
break;
|
|
}
|
|
|
|
/* Legacy interface */
|
|
case MEMGETOOBSEL:
|
|
{
|
|
struct nand_oobinfo oi;
|
|
|
|
if (!mtd->ecclayout)
|
|
return -EOPNOTSUPP;
|
|
if (mtd->ecclayout->eccbytes > ARRAY_SIZE(oi.eccpos))
|
|
return -EINVAL;
|
|
|
|
oi.useecc = MTD_NANDECC_AUTOPLACE;
|
|
memcpy(&oi.eccpos, mtd->ecclayout->eccpos, sizeof(oi.eccpos));
|
|
memcpy(&oi.oobfree, mtd->ecclayout->oobfree,
|
|
sizeof(oi.oobfree));
|
|
oi.eccbytes = mtd->ecclayout->eccbytes;
|
|
|
|
if (copy_to_user(argp, &oi, sizeof(struct nand_oobinfo)))
|
|
return -EFAULT;
|
|
break;
|
|
}
|
|
|
|
case MEMGETBADBLOCK:
|
|
{
|
|
loff_t offs;
|
|
|
|
if (copy_from_user(&offs, argp, sizeof(loff_t)))
|
|
return -EFAULT;
|
|
if (!mtd->block_isbad)
|
|
ret = -EOPNOTSUPP;
|
|
else
|
|
return mtd->block_isbad(mtd, offs);
|
|
break;
|
|
}
|
|
|
|
case MEMSETBADBLOCK:
|
|
{
|
|
loff_t offs;
|
|
|
|
if (copy_from_user(&offs, argp, sizeof(loff_t)))
|
|
return -EFAULT;
|
|
if (!mtd->block_markbad)
|
|
ret = -EOPNOTSUPP;
|
|
else
|
|
return mtd->block_markbad(mtd, offs);
|
|
break;
|
|
}
|
|
|
|
#ifdef CONFIG_HAVE_MTD_OTP
|
|
case OTPSELECT:
|
|
{
|
|
int mode;
|
|
if (copy_from_user(&mode, argp, sizeof(int)))
|
|
return -EFAULT;
|
|
|
|
mfi->mode = MTD_MODE_NORMAL;
|
|
|
|
ret = otp_select_filemode(mfi, mode);
|
|
|
|
file->f_pos = 0;
|
|
break;
|
|
}
|
|
|
|
case OTPGETREGIONCOUNT:
|
|
case OTPGETREGIONINFO:
|
|
{
|
|
struct otp_info *buf = kmalloc(4096, GFP_KERNEL);
|
|
if (!buf)
|
|
return -ENOMEM;
|
|
ret = -EOPNOTSUPP;
|
|
switch (mfi->mode) {
|
|
case MTD_MODE_OTP_FACTORY:
|
|
if (mtd->get_fact_prot_info)
|
|
ret = mtd->get_fact_prot_info(mtd, buf, 4096);
|
|
break;
|
|
case MTD_MODE_OTP_USER:
|
|
if (mtd->get_user_prot_info)
|
|
ret = mtd->get_user_prot_info(mtd, buf, 4096);
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
if (ret >= 0) {
|
|
if (cmd == OTPGETREGIONCOUNT) {
|
|
int nbr = ret / sizeof(struct otp_info);
|
|
ret = copy_to_user(argp, &nbr, sizeof(int));
|
|
} else
|
|
ret = copy_to_user(argp, buf, ret);
|
|
if (ret)
|
|
ret = -EFAULT;
|
|
}
|
|
kfree(buf);
|
|
break;
|
|
}
|
|
|
|
case OTPLOCK:
|
|
{
|
|
struct otp_info oinfo;
|
|
|
|
if (mfi->mode != MTD_MODE_OTP_USER)
|
|
return -EINVAL;
|
|
if (copy_from_user(&oinfo, argp, sizeof(oinfo)))
|
|
return -EFAULT;
|
|
if (!mtd->lock_user_prot_reg)
|
|
return -EOPNOTSUPP;
|
|
ret = mtd->lock_user_prot_reg(mtd, oinfo.start, oinfo.length);
|
|
break;
|
|
}
|
|
#endif
|
|
|
|
/* This ioctl is being deprecated - it truncates the ecc layout */
|
|
case ECCGETLAYOUT:
|
|
{
|
|
struct nand_ecclayout_user *usrlay;
|
|
|
|
if (!mtd->ecclayout)
|
|
return -EOPNOTSUPP;
|
|
|
|
usrlay = kmalloc(sizeof(*usrlay), GFP_KERNEL);
|
|
if (!usrlay)
|
|
return -ENOMEM;
|
|
|
|
shrink_ecclayout(mtd->ecclayout, usrlay);
|
|
|
|
if (copy_to_user(argp, usrlay, sizeof(*usrlay)))
|
|
ret = -EFAULT;
|
|
kfree(usrlay);
|
|
break;
|
|
}
|
|
|
|
case ECCGETSTATS:
|
|
{
|
|
if (copy_to_user(argp, &mtd->ecc_stats,
|
|
sizeof(struct mtd_ecc_stats)))
|
|
return -EFAULT;
|
|
break;
|
|
}
|
|
|
|
case MTDFILEMODE:
|
|
{
|
|
mfi->mode = 0;
|
|
|
|
switch(arg) {
|
|
case MTD_MODE_OTP_FACTORY:
|
|
case MTD_MODE_OTP_USER:
|
|
ret = otp_select_filemode(mfi, arg);
|
|
break;
|
|
|
|
case MTD_MODE_RAW:
|
|
if (!mtd->read_oob || !mtd->write_oob)
|
|
return -EOPNOTSUPP;
|
|
mfi->mode = arg;
|
|
|
|
case MTD_MODE_NORMAL:
|
|
break;
|
|
default:
|
|
ret = -EINVAL;
|
|
}
|
|
file->f_pos = 0;
|
|
break;
|
|
}
|
|
|
|
#ifdef CONFIG_MTD_PARTITIONS
|
|
case BLKPG:
|
|
{
|
|
ret = mtd_blkpg_ioctl(mtd,
|
|
(struct blkpg_ioctl_arg __user *)arg);
|
|
break;
|
|
}
|
|
|
|
case BLKRRPART:
|
|
{
|
|
/* No reread partition feature. Just return ok */
|
|
ret = 0;
|
|
break;
|
|
}
|
|
#endif
|
|
|
|
default:
|
|
ret = -ENOTTY;
|
|
}
|
|
|
|
return ret;
|
|
} /* memory_ioctl */
|
|
|
|
static long mtd_unlocked_ioctl(struct file *file, u_int cmd, u_long arg)
|
|
{
|
|
int ret;
|
|
|
|
mutex_lock(&mtd_mutex);
|
|
ret = mtd_ioctl(file, cmd, arg);
|
|
mutex_unlock(&mtd_mutex);
|
|
|
|
return ret;
|
|
}
|
|
|
|
#ifdef CONFIG_COMPAT
|
|
|
|
struct mtd_oob_buf32 {
|
|
u_int32_t start;
|
|
u_int32_t length;
|
|
compat_caddr_t ptr; /* unsigned char* */
|
|
};
|
|
|
|
#define MEMWRITEOOB32 _IOWR('M', 3, struct mtd_oob_buf32)
|
|
#define MEMREADOOB32 _IOWR('M', 4, struct mtd_oob_buf32)
|
|
|
|
static long mtd_compat_ioctl(struct file *file, unsigned int cmd,
|
|
unsigned long arg)
|
|
{
|
|
struct mtd_file_info *mfi = file->private_data;
|
|
struct mtd_info *mtd = mfi->mtd;
|
|
void __user *argp = compat_ptr(arg);
|
|
int ret = 0;
|
|
|
|
mutex_lock(&mtd_mutex);
|
|
|
|
switch (cmd) {
|
|
case MEMWRITEOOB32:
|
|
{
|
|
struct mtd_oob_buf32 buf;
|
|
struct mtd_oob_buf32 __user *buf_user = argp;
|
|
|
|
if (copy_from_user(&buf, argp, sizeof(buf)))
|
|
ret = -EFAULT;
|
|
else
|
|
ret = mtd_do_writeoob(file, mtd, buf.start,
|
|
buf.length, compat_ptr(buf.ptr),
|
|
&buf_user->length);
|
|
break;
|
|
}
|
|
|
|
case MEMREADOOB32:
|
|
{
|
|
struct mtd_oob_buf32 buf;
|
|
struct mtd_oob_buf32 __user *buf_user = argp;
|
|
|
|
/* NOTE: writes return length to buf->start */
|
|
if (copy_from_user(&buf, argp, sizeof(buf)))
|
|
ret = -EFAULT;
|
|
else
|
|
ret = mtd_do_readoob(mtd, buf.start,
|
|
buf.length, compat_ptr(buf.ptr),
|
|
&buf_user->start);
|
|
break;
|
|
}
|
|
default:
|
|
ret = mtd_ioctl(file, cmd, (unsigned long)argp);
|
|
}
|
|
|
|
mutex_unlock(&mtd_mutex);
|
|
|
|
return ret;
|
|
}
|
|
|
|
#endif /* CONFIG_COMPAT */
|
|
|
|
/*
|
|
* try to determine where a shared mapping can be made
|
|
* - only supported for NOMMU at the moment (MMU can't doesn't copy private
|
|
* mappings)
|
|
*/
|
|
#ifndef CONFIG_MMU
|
|
static unsigned long mtd_get_unmapped_area(struct file *file,
|
|
unsigned long addr,
|
|
unsigned long len,
|
|
unsigned long pgoff,
|
|
unsigned long flags)
|
|
{
|
|
struct mtd_file_info *mfi = file->private_data;
|
|
struct mtd_info *mtd = mfi->mtd;
|
|
|
|
if (mtd->get_unmapped_area) {
|
|
unsigned long offset;
|
|
|
|
if (addr != 0)
|
|
return (unsigned long) -EINVAL;
|
|
|
|
if (len > mtd->size || pgoff >= (mtd->size >> PAGE_SHIFT))
|
|
return (unsigned long) -EINVAL;
|
|
|
|
offset = pgoff << PAGE_SHIFT;
|
|
if (offset > mtd->size - len)
|
|
return (unsigned long) -EINVAL;
|
|
|
|
return mtd->get_unmapped_area(mtd, len, offset, flags);
|
|
}
|
|
|
|
/* can't map directly */
|
|
return (unsigned long) -ENOSYS;
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* set up a mapping for shared memory segments
|
|
*/
|
|
static int mtd_mmap(struct file *file, struct vm_area_struct *vma)
|
|
{
|
|
#ifdef CONFIG_MMU
|
|
struct mtd_file_info *mfi = file->private_data;
|
|
struct mtd_info *mtd = mfi->mtd;
|
|
struct map_info *map = mtd->priv;
|
|
unsigned long start;
|
|
unsigned long off;
|
|
u32 len;
|
|
|
|
if (mtd->type == MTD_RAM || mtd->type == MTD_ROM) {
|
|
off = vma->vm_pgoff << PAGE_SHIFT;
|
|
start = map->phys;
|
|
len = PAGE_ALIGN((start & ~PAGE_MASK) + map->size);
|
|
start &= PAGE_MASK;
|
|
if ((vma->vm_end - vma->vm_start + off) > len)
|
|
return -EINVAL;
|
|
|
|
off += start;
|
|
vma->vm_pgoff = off >> PAGE_SHIFT;
|
|
vma->vm_flags |= VM_IO | VM_RESERVED;
|
|
|
|
#ifdef pgprot_noncached
|
|
if (file->f_flags & O_DSYNC || off >= __pa(high_memory))
|
|
vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
|
|
#endif
|
|
if (io_remap_pfn_range(vma, vma->vm_start, off >> PAGE_SHIFT,
|
|
vma->vm_end - vma->vm_start,
|
|
vma->vm_page_prot))
|
|
return -EAGAIN;
|
|
|
|
return 0;
|
|
}
|
|
return -ENOSYS;
|
|
#else
|
|
return vma->vm_flags & VM_SHARED ? 0 : -ENOSYS;
|
|
#endif
|
|
}
|
|
|
|
static const struct file_operations mtd_fops = {
|
|
.owner = THIS_MODULE,
|
|
.llseek = mtd_lseek,
|
|
.read = mtd_read,
|
|
.write = mtd_write,
|
|
.unlocked_ioctl = mtd_unlocked_ioctl,
|
|
#ifdef CONFIG_COMPAT
|
|
.compat_ioctl = mtd_compat_ioctl,
|
|
#endif
|
|
.open = mtd_open,
|
|
.release = mtd_close,
|
|
.mmap = mtd_mmap,
|
|
#ifndef CONFIG_MMU
|
|
.get_unmapped_area = mtd_get_unmapped_area,
|
|
#endif
|
|
};
|
|
|
|
static struct dentry *mtd_inodefs_mount(struct file_system_type *fs_type,
|
|
int flags, const char *dev_name, void *data)
|
|
{
|
|
return mount_pseudo(fs_type, "mtd_inode:", NULL, NULL, MTD_INODE_FS_MAGIC);
|
|
}
|
|
|
|
static struct file_system_type mtd_inodefs_type = {
|
|
.name = "mtd_inodefs",
|
|
.mount = mtd_inodefs_mount,
|
|
.kill_sb = kill_anon_super,
|
|
};
|
|
|
|
static void mtdchar_notify_add(struct mtd_info *mtd)
|
|
{
|
|
}
|
|
|
|
static void mtdchar_notify_remove(struct mtd_info *mtd)
|
|
{
|
|
struct inode *mtd_ino = ilookup(mtd_inode_mnt->mnt_sb, mtd->index);
|
|
|
|
if (mtd_ino) {
|
|
/* Destroy the inode if it exists */
|
|
mtd_ino->i_nlink = 0;
|
|
iput(mtd_ino);
|
|
}
|
|
}
|
|
|
|
static struct mtd_notifier mtdchar_notifier = {
|
|
.add = mtdchar_notify_add,
|
|
.remove = mtdchar_notify_remove,
|
|
};
|
|
|
|
static int __init init_mtdchar(void)
|
|
{
|
|
int ret;
|
|
|
|
ret = __register_chrdev(MTD_CHAR_MAJOR, 0, 1 << MINORBITS,
|
|
"mtd", &mtd_fops);
|
|
if (ret < 0) {
|
|
pr_notice("Can't allocate major number %d for "
|
|
"Memory Technology Devices.\n", MTD_CHAR_MAJOR);
|
|
return ret;
|
|
}
|
|
|
|
ret = register_filesystem(&mtd_inodefs_type);
|
|
if (ret) {
|
|
pr_notice("Can't register mtd_inodefs filesystem: %d\n", ret);
|
|
goto err_unregister_chdev;
|
|
}
|
|
|
|
mtd_inode_mnt = kern_mount(&mtd_inodefs_type);
|
|
if (IS_ERR(mtd_inode_mnt)) {
|
|
ret = PTR_ERR(mtd_inode_mnt);
|
|
pr_notice("Error mounting mtd_inodefs filesystem: %d\n", ret);
|
|
goto err_unregister_filesystem;
|
|
}
|
|
register_mtd_user(&mtdchar_notifier);
|
|
|
|
return ret;
|
|
|
|
err_unregister_filesystem:
|
|
unregister_filesystem(&mtd_inodefs_type);
|
|
err_unregister_chdev:
|
|
__unregister_chrdev(MTD_CHAR_MAJOR, 0, 1 << MINORBITS, "mtd");
|
|
return ret;
|
|
}
|
|
|
|
static void __exit cleanup_mtdchar(void)
|
|
{
|
|
unregister_mtd_user(&mtdchar_notifier);
|
|
mntput(mtd_inode_mnt);
|
|
unregister_filesystem(&mtd_inodefs_type);
|
|
__unregister_chrdev(MTD_CHAR_MAJOR, 0, 1 << MINORBITS, "mtd");
|
|
}
|
|
|
|
module_init(init_mtdchar);
|
|
module_exit(cleanup_mtdchar);
|
|
|
|
MODULE_ALIAS_CHARDEV_MAJOR(MTD_CHAR_MAJOR);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
|
|
MODULE_DESCRIPTION("Direct character-device access to MTD devices");
|
|
MODULE_ALIAS_CHARDEV_MAJOR(MTD_CHAR_MAJOR);
|