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1231 lines
26 KiB
1231 lines
26 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
|
/* |
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* Copyright © 1999-2010 David Woodhouse <[email protected]> |
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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/magic.h> |
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#include <linux/major.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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|
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#include <linux/uaccess.h> |
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|
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#include "mtdcore.h" |
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|
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static DEFINE_MUTEX(mtd_mutex); |
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|
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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 of 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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enum mtd_file_modes mode; |
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}; |
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|
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static loff_t mtdchar_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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return fixed_size_llseek(file, offset, orig, mfi->mtd->size); |
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} |
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|
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static int mtdchar_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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|
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pr_debug("MTD_open\n"); |
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|
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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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|
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mutex_lock(&mtd_mutex); |
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mtd = get_mtd_device(NULL, devnum); |
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|
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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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|
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if (mtd->type == MTD_ABSENT) { |
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ret = -ENODEV; |
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goto out1; |
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} |
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|
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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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ret = -EACCES; |
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goto out1; |
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} |
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|
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mfi = kzalloc(sizeof(*mfi), GFP_KERNEL); |
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if (!mfi) { |
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ret = -ENOMEM; |
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goto out1; |
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} |
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mfi->mtd = mtd; |
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file->private_data = mfi; |
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mutex_unlock(&mtd_mutex); |
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return 0; |
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|
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out1: |
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put_mtd_device(mtd); |
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out: |
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mutex_unlock(&mtd_mutex); |
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return ret; |
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} /* mtdchar_open */ |
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|
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/*====================================================================*/ |
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|
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static int mtdchar_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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|
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pr_debug("MTD_close\n"); |
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|
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/* Only sync if opened RW */ |
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if ((file->f_mode & FMODE_WRITE)) |
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mtd_sync(mtd); |
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|
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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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|
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return 0; |
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} /* mtdchar_close */ |
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|
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/* Back in June 2001, dwmw2 wrote: |
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* |
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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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* The implementation below, using mtd_kmalloc_up_to, mitigates |
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* allocation failures when the system is under low-memory situations |
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* or if memory is highly fragmented at the cost of reducing the |
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* performance of the requested transfer due to a smaller buffer size. |
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* |
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* A more complex but more memory-efficient implementation based on |
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* get_user_pages and iovecs to cover extents of those pages is a |
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* longer-term goal, as intimated by dwmw2 above. However, for the |
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* write case, this requires yet more complex head and tail transfer |
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* handling when those head and tail offsets and sizes are such that |
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* alignment requirements are not met in the NAND subdriver. |
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*/ |
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|
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static ssize_t mtdchar_read(struct file *file, char __user *buf, size_t count, |
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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; |
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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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size_t size = count; |
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char *kbuf; |
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|
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pr_debug("MTD_read\n"); |
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|
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if (*ppos + count > mtd->size) { |
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if (*ppos < mtd->size) |
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count = mtd->size - *ppos; |
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else |
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count = 0; |
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} |
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|
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if (!count) |
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return 0; |
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|
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kbuf = mtd_kmalloc_up_to(mtd, &size); |
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if (!kbuf) |
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return -ENOMEM; |
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|
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while (count) { |
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len = min_t(size_t, count, size); |
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|
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switch (mfi->mode) { |
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case MTD_FILE_MODE_OTP_FACTORY: |
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ret = mtd_read_fact_prot_reg(mtd, *ppos, len, |
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&retlen, kbuf); |
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break; |
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case MTD_FILE_MODE_OTP_USER: |
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ret = mtd_read_user_prot_reg(mtd, *ppos, len, |
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&retlen, kbuf); |
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break; |
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case MTD_FILE_MODE_RAW: |
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{ |
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struct mtd_oob_ops ops = {}; |
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|
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ops.mode = MTD_OPS_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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|
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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 || mtd_is_bitflip_or_eccerr(ret)) { |
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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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|
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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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} /* mtdchar_read */ |
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static ssize_t mtdchar_write(struct file *file, const char __user *buf, size_t count, |
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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 size = count; |
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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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pr_debug("MTD_write\n"); |
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|
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if (*ppos >= mtd->size) |
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return -ENOSPC; |
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|
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if (*ppos + count > mtd->size) |
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count = mtd->size - *ppos; |
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|
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if (!count) |
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return 0; |
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kbuf = mtd_kmalloc_up_to(mtd, &size); |
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if (!kbuf) |
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return -ENOMEM; |
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|
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while (count) { |
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len = min_t(size_t, count, size); |
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|
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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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|
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switch (mfi->mode) { |
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case MTD_FILE_MODE_OTP_FACTORY: |
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ret = -EROFS; |
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break; |
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case MTD_FILE_MODE_OTP_USER: |
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ret = mtd_write_user_prot_reg(mtd, *ppos, len, |
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&retlen, kbuf); |
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break; |
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|
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case MTD_FILE_MODE_RAW: |
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{ |
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struct mtd_oob_ops ops = {}; |
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|
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ops.mode = MTD_OPS_RAW; |
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ops.datbuf = kbuf; |
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ops.oobbuf = NULL; |
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ops.ooboffs = 0; |
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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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/* |
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* Return -ENOSPC only if no data could be written at all. |
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* Otherwise just return the number of bytes that actually |
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* have been written. |
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*/ |
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if ((ret == -ENOSPC) && (total_retlen)) |
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break; |
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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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|
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kfree(kbuf); |
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return total_retlen; |
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} /* mtdchar_write */ |
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|
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/*====================================================================== |
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|
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IOCTL calls for getting device parameters. |
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|
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======================================================================*/ |
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|
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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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size_t retlen; |
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switch (mode) { |
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case MTD_OTP_FACTORY: |
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if (mtd_read_fact_prot_reg(mtd, -1, 0, &retlen, NULL) == |
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-EOPNOTSUPP) |
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return -EOPNOTSUPP; |
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|
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mfi->mode = MTD_FILE_MODE_OTP_FACTORY; |
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break; |
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case MTD_OTP_USER: |
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if (mtd_read_user_prot_reg(mtd, -1, 0, &retlen, NULL) == |
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-EOPNOTSUPP) |
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return -EOPNOTSUPP; |
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mfi->mode = MTD_FILE_MODE_OTP_USER; |
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break; |
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case MTD_OTP_OFF: |
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mfi->mode = MTD_FILE_MODE_NORMAL; |
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break; |
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default: |
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return -EINVAL; |
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} |
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return 0; |
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} |
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static int mtdchar_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_info *master = mtd_get_master(mtd); |
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struct mtd_file_info *mfi = file->private_data; |
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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 (length > 4096) |
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return -EINVAL; |
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|
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if (!master->_write_oob) |
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return -EOPNOTSUPP; |
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ops.ooblen = length; |
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ops.ooboffs = start & (mtd->writesize - 1); |
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ops.datbuf = NULL; |
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ops.mode = (mfi->mode == MTD_FILE_MODE_RAW) ? MTD_OPS_RAW : |
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MTD_OPS_PLACE_OOB; |
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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->writesize - 1); |
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ret = mtd_write_oob(mtd, start, &ops); |
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|
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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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|
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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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static int mtdchar_readoob(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_file_info *mfi = file->private_data; |
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struct mtd_oob_ops ops = {}; |
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int ret = 0; |
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|
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if (length > 4096) |
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return -EINVAL; |
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ops.ooblen = length; |
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ops.ooboffs = start & (mtd->writesize - 1); |
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ops.datbuf = NULL; |
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ops.mode = (mfi->mode == MTD_FILE_MODE_RAW) ? MTD_OPS_RAW : |
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MTD_OPS_PLACE_OOB; |
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|
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if (ops.ooboffs && ops.ooblen > (mtd->oobsize - ops.ooboffs)) |
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return -EINVAL; |
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|
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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->writesize - 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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|
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kfree(ops.oobbuf); |
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|
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/* |
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* NAND returns -EBADMSG on ECC errors, but it returns the OOB |
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* data. For our userspace tools it is important to dump areas |
|
* with ECC errors! |
|
* For kernel internal usage it also might return -EUCLEAN |
|
* to signal the caller that a bitflip has occurred and has |
|
* been corrected by the ECC algorithm. |
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* |
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* Note: currently the standard NAND function, nand_read_oob_std, |
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* does not calculate ECC for the OOB area, so do not rely on |
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* this behavior unless you have replaced it with your own. |
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*/ |
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if (mtd_is_bitflip_or_eccerr(ret)) |
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return 0; |
|
|
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return ret; |
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} |
|
|
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/* |
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* Copies (and truncates, if necessary) OOB layout information to the |
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* deprecated layout struct, nand_ecclayout_user. This is necessary only to |
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* support the deprecated API ioctl ECCGETLAYOUT while allowing all new |
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* functionality to use mtd_ooblayout_ops flexibly (i.e. mtd_ooblayout_ops |
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* can describe any kind of OOB layout with almost zero overhead from a |
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* memory usage point of view). |
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*/ |
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static int shrink_ecclayout(struct mtd_info *mtd, |
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struct nand_ecclayout_user *to) |
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{ |
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struct mtd_oob_region oobregion; |
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int i, section = 0, ret; |
|
|
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if (!mtd || !to) |
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return -EINVAL; |
|
|
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memset(to, 0, sizeof(*to)); |
|
|
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to->eccbytes = 0; |
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for (i = 0; i < MTD_MAX_ECCPOS_ENTRIES;) { |
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u32 eccpos; |
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|
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ret = mtd_ooblayout_ecc(mtd, section++, &oobregion); |
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if (ret < 0) { |
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if (ret != -ERANGE) |
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return ret; |
|
|
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break; |
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} |
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|
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eccpos = oobregion.offset; |
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for (; i < MTD_MAX_ECCPOS_ENTRIES && |
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eccpos < oobregion.offset + oobregion.length; i++) { |
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to->eccpos[i] = eccpos++; |
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to->eccbytes++; |
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} |
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} |
|
|
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for (i = 0; i < MTD_MAX_OOBFREE_ENTRIES; i++) { |
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ret = mtd_ooblayout_free(mtd, i, &oobregion); |
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if (ret < 0) { |
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if (ret != -ERANGE) |
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return ret; |
|
|
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break; |
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} |
|
|
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to->oobfree[i].offset = oobregion.offset; |
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to->oobfree[i].length = oobregion.length; |
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to->oobavail += to->oobfree[i].length; |
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} |
|
|
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return 0; |
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} |
|
|
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static int get_oobinfo(struct mtd_info *mtd, struct nand_oobinfo *to) |
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{ |
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struct mtd_oob_region oobregion; |
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int i, section = 0, ret; |
|
|
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if (!mtd || !to) |
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return -EINVAL; |
|
|
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memset(to, 0, sizeof(*to)); |
|
|
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to->eccbytes = 0; |
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for (i = 0; i < ARRAY_SIZE(to->eccpos);) { |
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u32 eccpos; |
|
|
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ret = mtd_ooblayout_ecc(mtd, section++, &oobregion); |
|
if (ret < 0) { |
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if (ret != -ERANGE) |
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return ret; |
|
|
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break; |
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} |
|
|
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if (oobregion.length + i > ARRAY_SIZE(to->eccpos)) |
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return -EINVAL; |
|
|
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eccpos = oobregion.offset; |
|
for (; eccpos < oobregion.offset + oobregion.length; i++) { |
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to->eccpos[i] = eccpos++; |
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to->eccbytes++; |
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} |
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} |
|
|
|
for (i = 0; i < 8; i++) { |
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ret = mtd_ooblayout_free(mtd, i, &oobregion); |
|
if (ret < 0) { |
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if (ret != -ERANGE) |
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return ret; |
|
|
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break; |
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} |
|
|
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to->oobfree[i][0] = oobregion.offset; |
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to->oobfree[i][1] = oobregion.length; |
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} |
|
|
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to->useecc = MTD_NANDECC_AUTOPLACE; |
|
|
|
return 0; |
|
} |
|
|
|
static int mtdchar_blkpg_ioctl(struct mtd_info *mtd, |
|
struct blkpg_ioctl_arg *arg) |
|
{ |
|
struct blkpg_partition p; |
|
|
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if (!capable(CAP_SYS_ADMIN)) |
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return -EPERM; |
|
|
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if (copy_from_user(&p, arg->data, sizeof(p))) |
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return -EFAULT; |
|
|
|
switch (arg->op) { |
|
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; |
|
|
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/* Sanitize user input */ |
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p.devname[BLKPG_DEVNAMELTH - 1] = '\0'; |
|
|
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return mtd_add_partition(mtd, p.devname, p.start, p.length); |
|
|
|
case BLKPG_DEL_PARTITION: |
|
|
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if (p.pno < 0) |
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return -EINVAL; |
|
|
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return mtd_del_partition(mtd, p.pno); |
|
|
|
default: |
|
return -EINVAL; |
|
} |
|
} |
|
|
|
static int mtdchar_write_ioctl(struct mtd_info *mtd, |
|
struct mtd_write_req __user *argp) |
|
{ |
|
struct mtd_info *master = mtd_get_master(mtd); |
|
struct mtd_write_req req; |
|
struct mtd_oob_ops ops = {}; |
|
const void __user *usr_data, *usr_oob; |
|
int ret; |
|
|
|
if (copy_from_user(&req, argp, sizeof(req))) |
|
return -EFAULT; |
|
|
|
usr_data = (const void __user *)(uintptr_t)req.usr_data; |
|
usr_oob = (const void __user *)(uintptr_t)req.usr_oob; |
|
|
|
if (!master->_write_oob) |
|
return -EOPNOTSUPP; |
|
ops.mode = req.mode; |
|
ops.len = (size_t)req.len; |
|
ops.ooblen = (size_t)req.ooblen; |
|
ops.ooboffs = 0; |
|
|
|
if (usr_data) { |
|
ops.datbuf = memdup_user(usr_data, ops.len); |
|
if (IS_ERR(ops.datbuf)) |
|
return PTR_ERR(ops.datbuf); |
|
} else { |
|
ops.datbuf = NULL; |
|
} |
|
|
|
if (usr_oob) { |
|
ops.oobbuf = memdup_user(usr_oob, ops.ooblen); |
|
if (IS_ERR(ops.oobbuf)) { |
|
kfree(ops.datbuf); |
|
return PTR_ERR(ops.oobbuf); |
|
} |
|
} else { |
|
ops.oobbuf = NULL; |
|
} |
|
|
|
ret = mtd_write_oob(mtd, (loff_t)req.start, &ops); |
|
|
|
kfree(ops.datbuf); |
|
kfree(ops.oobbuf); |
|
|
|
return ret; |
|
} |
|
|
|
static int mtdchar_ioctl(struct file *file, u_int cmd, u_long arg) |
|
{ |
|
struct mtd_file_info *mfi = file->private_data; |
|
struct mtd_info *mtd = mfi->mtd; |
|
struct mtd_info *master = mtd_get_master(mtd); |
|
void __user *argp = (void __user *)arg; |
|
int ret = 0; |
|
struct mtd_info_user info; |
|
|
|
pr_debug("MTD_ioctl\n"); |
|
|
|
/* |
|
* Check the file mode to require "dangerous" commands to have write |
|
* permissions. |
|
*/ |
|
switch (cmd) { |
|
/* "safe" commands */ |
|
case MEMGETREGIONCOUNT: |
|
case MEMGETREGIONINFO: |
|
case MEMGETINFO: |
|
case MEMREADOOB: |
|
case MEMREADOOB64: |
|
case MEMISLOCKED: |
|
case MEMGETOOBSEL: |
|
case MEMGETBADBLOCK: |
|
case OTPSELECT: |
|
case OTPGETREGIONCOUNT: |
|
case OTPGETREGIONINFO: |
|
case ECCGETLAYOUT: |
|
case ECCGETSTATS: |
|
case MTDFILEMODE: |
|
case BLKPG: |
|
case BLKRRPART: |
|
break; |
|
|
|
/* "dangerous" commands */ |
|
case MEMERASE: |
|
case MEMERASE64: |
|
case MEMLOCK: |
|
case MEMUNLOCK: |
|
case MEMSETBADBLOCK: |
|
case MEMWRITEOOB: |
|
case MEMWRITEOOB64: |
|
case MEMWRITE: |
|
case OTPLOCK: |
|
if (!(file->f_mode & FMODE_WRITE)) |
|
return -EPERM; |
|
break; |
|
|
|
default: |
|
return -ENOTTY; |
|
} |
|
|
|
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 field is obsolete */ |
|
info.padding = 0; |
|
if (copy_to_user(argp, &info, sizeof(struct mtd_info_user))) |
|
return -EFAULT; |
|
break; |
|
|
|
case MEMERASE: |
|
case MEMERASE64: |
|
{ |
|
struct erase_info *erase; |
|
|
|
erase=kzalloc(sizeof(struct erase_info),GFP_KERNEL); |
|
if (!erase) |
|
ret = -ENOMEM; |
|
else { |
|
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; |
|
} |
|
|
|
ret = mtd_erase(mtd, erase); |
|
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 = mtdchar_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 = mtdchar_readoob(file, 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 = mtdchar_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 = mtdchar_readoob(file, mtd, buf.start, buf.length, |
|
(void __user *)(uintptr_t)buf.usr_ptr, |
|
&buf_user->length); |
|
break; |
|
} |
|
|
|
case MEMWRITE: |
|
{ |
|
ret = mtdchar_write_ioctl(mtd, |
|
(struct mtd_write_req __user *)arg); |
|
break; |
|
} |
|
|
|
case MEMLOCK: |
|
{ |
|
struct erase_info_user einfo; |
|
|
|
if (copy_from_user(&einfo, argp, sizeof(einfo))) |
|
return -EFAULT; |
|
|
|
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; |
|
|
|
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; |
|
|
|
ret = mtd_is_locked(mtd, einfo.start, einfo.length); |
|
break; |
|
} |
|
|
|
/* Legacy interface */ |
|
case MEMGETOOBSEL: |
|
{ |
|
struct nand_oobinfo oi; |
|
|
|
if (!master->ooblayout) |
|
return -EOPNOTSUPP; |
|
|
|
ret = get_oobinfo(mtd, &oi); |
|
if (ret) |
|
return ret; |
|
|
|
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; |
|
return mtd_block_isbad(mtd, offs); |
|
} |
|
|
|
case MEMSETBADBLOCK: |
|
{ |
|
loff_t offs; |
|
|
|
if (copy_from_user(&offs, argp, sizeof(loff_t))) |
|
return -EFAULT; |
|
return mtd_block_markbad(mtd, offs); |
|
} |
|
|
|
case OTPSELECT: |
|
{ |
|
int mode; |
|
if (copy_from_user(&mode, argp, sizeof(int))) |
|
return -EFAULT; |
|
|
|
mfi->mode = MTD_FILE_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); |
|
size_t retlen; |
|
if (!buf) |
|
return -ENOMEM; |
|
switch (mfi->mode) { |
|
case MTD_FILE_MODE_OTP_FACTORY: |
|
ret = mtd_get_fact_prot_info(mtd, 4096, &retlen, buf); |
|
break; |
|
case MTD_FILE_MODE_OTP_USER: |
|
ret = mtd_get_user_prot_info(mtd, 4096, &retlen, buf); |
|
break; |
|
default: |
|
ret = -EINVAL; |
|
break; |
|
} |
|
if (!ret) { |
|
if (cmd == OTPGETREGIONCOUNT) { |
|
int nbr = retlen / sizeof(struct otp_info); |
|
ret = copy_to_user(argp, &nbr, sizeof(int)); |
|
} else |
|
ret = copy_to_user(argp, buf, retlen); |
|
if (ret) |
|
ret = -EFAULT; |
|
} |
|
kfree(buf); |
|
break; |
|
} |
|
|
|
case OTPLOCK: |
|
{ |
|
struct otp_info oinfo; |
|
|
|
if (mfi->mode != MTD_FILE_MODE_OTP_USER) |
|
return -EINVAL; |
|
if (copy_from_user(&oinfo, argp, sizeof(oinfo))) |
|
return -EFAULT; |
|
ret = mtd_lock_user_prot_reg(mtd, oinfo.start, oinfo.length); |
|
break; |
|
} |
|
|
|
/* This ioctl is being deprecated - it truncates the ECC layout */ |
|
case ECCGETLAYOUT: |
|
{ |
|
struct nand_ecclayout_user *usrlay; |
|
|
|
if (!master->ooblayout) |
|
return -EOPNOTSUPP; |
|
|
|
usrlay = kmalloc(sizeof(*usrlay), GFP_KERNEL); |
|
if (!usrlay) |
|
return -ENOMEM; |
|
|
|
shrink_ecclayout(mtd, 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_FILE_MODE_OTP_FACTORY: |
|
case MTD_FILE_MODE_OTP_USER: |
|
ret = otp_select_filemode(mfi, arg); |
|
break; |
|
|
|
case MTD_FILE_MODE_RAW: |
|
if (!mtd_has_oob(mtd)) |
|
return -EOPNOTSUPP; |
|
mfi->mode = arg; |
|
|
|
case MTD_FILE_MODE_NORMAL: |
|
break; |
|
default: |
|
ret = -EINVAL; |
|
} |
|
file->f_pos = 0; |
|
break; |
|
} |
|
|
|
case BLKPG: |
|
{ |
|
struct blkpg_ioctl_arg __user *blk_arg = argp; |
|
struct blkpg_ioctl_arg a; |
|
|
|
if (copy_from_user(&a, blk_arg, sizeof(a))) |
|
ret = -EFAULT; |
|
else |
|
ret = mtdchar_blkpg_ioctl(mtd, &a); |
|
break; |
|
} |
|
|
|
case BLKRRPART: |
|
{ |
|
/* No reread partition feature. Just return ok */ |
|
ret = 0; |
|
break; |
|
} |
|
} |
|
|
|
return ret; |
|
} /* memory_ioctl */ |
|
|
|
static long mtdchar_unlocked_ioctl(struct file *file, u_int cmd, u_long arg) |
|
{ |
|
int ret; |
|
|
|
mutex_lock(&mtd_mutex); |
|
ret = mtdchar_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 mtdchar_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 (!(file->f_mode & FMODE_WRITE)) { |
|
ret = -EPERM; |
|
break; |
|
} |
|
|
|
if (copy_from_user(&buf, argp, sizeof(buf))) |
|
ret = -EFAULT; |
|
else |
|
ret = mtdchar_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 = mtdchar_readoob(file, mtd, buf.start, |
|
buf.length, compat_ptr(buf.ptr), |
|
&buf_user->start); |
|
break; |
|
} |
|
|
|
case BLKPG: |
|
{ |
|
/* Convert from blkpg_compat_ioctl_arg to blkpg_ioctl_arg */ |
|
struct blkpg_compat_ioctl_arg __user *uarg = argp; |
|
struct blkpg_compat_ioctl_arg compat_arg; |
|
struct blkpg_ioctl_arg a; |
|
|
|
if (copy_from_user(&compat_arg, uarg, sizeof(compat_arg))) { |
|
ret = -EFAULT; |
|
break; |
|
} |
|
|
|
memset(&a, 0, sizeof(a)); |
|
a.op = compat_arg.op; |
|
a.flags = compat_arg.flags; |
|
a.datalen = compat_arg.datalen; |
|
a.data = compat_ptr(compat_arg.data); |
|
|
|
ret = mtdchar_blkpg_ioctl(mtd, &a); |
|
break; |
|
} |
|
|
|
default: |
|
ret = mtdchar_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 mtdchar_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; |
|
unsigned long offset; |
|
int ret; |
|
|
|
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; |
|
|
|
ret = mtd_get_unmapped_area(mtd, len, offset, flags); |
|
return ret == -EOPNOTSUPP ? -ENODEV : ret; |
|
} |
|
|
|
static unsigned mtdchar_mmap_capabilities(struct file *file) |
|
{ |
|
struct mtd_file_info *mfi = file->private_data; |
|
|
|
return mtd_mmap_capabilities(mfi->mtd); |
|
} |
|
#endif |
|
|
|
/* |
|
* set up a mapping for shared memory segments |
|
*/ |
|
static int mtdchar_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; |
|
|
|
/* This is broken because it assumes the MTD device is map-based |
|
and that mtd->priv is a valid struct map_info. It should be |
|
replaced with something that uses the mtd_get_unmapped_area() |
|
operation properly. */ |
|
if (0 /*mtd->type == MTD_RAM || mtd->type == MTD_ROM*/) { |
|
#ifdef pgprot_noncached |
|
if (file->f_flags & O_DSYNC || map->phys >= __pa(high_memory)) |
|
vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); |
|
#endif |
|
return vm_iomap_memory(vma, map->phys, map->size); |
|
} |
|
return -ENODEV; |
|
#else |
|
return vma->vm_flags & VM_SHARED ? 0 : -EACCES; |
|
#endif |
|
} |
|
|
|
static const struct file_operations mtd_fops = { |
|
.owner = THIS_MODULE, |
|
.llseek = mtdchar_lseek, |
|
.read = mtdchar_read, |
|
.write = mtdchar_write, |
|
.unlocked_ioctl = mtdchar_unlocked_ioctl, |
|
#ifdef CONFIG_COMPAT |
|
.compat_ioctl = mtdchar_compat_ioctl, |
|
#endif |
|
.open = mtdchar_open, |
|
.release = mtdchar_close, |
|
.mmap = mtdchar_mmap, |
|
#ifndef CONFIG_MMU |
|
.get_unmapped_area = mtdchar_get_unmapped_area, |
|
.mmap_capabilities = mtdchar_mmap_capabilities, |
|
#endif |
|
}; |
|
|
|
int __init init_mtdchar(void) |
|
{ |
|
int ret; |
|
|
|
ret = __register_chrdev(MTD_CHAR_MAJOR, 0, 1 << MINORBITS, |
|
"mtd", &mtd_fops); |
|
if (ret < 0) { |
|
pr_err("Can't allocate major number %d for MTD\n", |
|
MTD_CHAR_MAJOR); |
|
return ret; |
|
} |
|
|
|
return ret; |
|
} |
|
|
|
void __exit cleanup_mtdchar(void) |
|
{ |
|
__unregister_chrdev(MTD_CHAR_MAJOR, 0, 1 << MINORBITS, "mtd"); |
|
} |
|
|
|
MODULE_ALIAS_CHARDEV_MAJOR(MTD_CHAR_MAJOR);
|
|
|