| // SPDX-License-Identifier: GPL-2.0-or-later |
| /* |
| * Copyright © 1999-2010 David Woodhouse <dwmw2@infradead.org> |
| */ |
| |
| #include <linux/device.h> |
| #include <linux/fs.h> |
| #include <linux/mm.h> |
| #include <linux/err.h> |
| #include <linux/init.h> |
| #include <linux/kernel.h> |
| #include <linux/module.h> |
| #include <linux/slab.h> |
| #include <linux/sched.h> |
| #include <linux/mutex.h> |
| #include <linux/backing-dev.h> |
| #include <linux/compat.h> |
| #include <linux/mount.h> |
| #include <linux/blkpg.h> |
| #include <linux/magic.h> |
| #include <linux/major.h> |
| #include <linux/mtd/mtd.h> |
| #include <linux/mtd/partitions.h> |
| #include <linux/mtd/map.h> |
| |
| #include <linux/uaccess.h> |
| |
| #include "mtdcore.h" |
| |
| static DEFINE_MUTEX(mtd_mutex); |
| |
| /* |
| * Data structure to hold the pointer to the mtd device as well |
| * as mode information of various use cases. |
| */ |
| struct mtd_file_info { |
| struct mtd_info *mtd; |
| enum mtd_file_modes mode; |
| }; |
| |
| static loff_t mtdchar_lseek(struct file *file, loff_t offset, int orig) |
| { |
| struct mtd_file_info *mfi = file->private_data; |
| return fixed_size_llseek(file, offset, orig, mfi->mtd->size); |
| } |
| |
| static int mtdchar_open(struct inode *inode, struct file *file) |
| { |
| int minor = iminor(inode); |
| int devnum = minor >> 1; |
| int ret = 0; |
| struct mtd_info *mtd; |
| struct mtd_file_info *mfi; |
| |
| pr_debug("MTD_open\n"); |
| |
| /* You can't open the RO devices RW */ |
| if ((file->f_mode & FMODE_WRITE) && (minor & 1)) |
| return -EACCES; |
| |
| mutex_lock(&mtd_mutex); |
| mtd = get_mtd_device(NULL, devnum); |
| |
| if (IS_ERR(mtd)) { |
| ret = PTR_ERR(mtd); |
| goto out; |
| } |
| |
| if (mtd->type == MTD_ABSENT) { |
| ret = -ENODEV; |
| goto out1; |
| } |
| |
| /* You can't open it RW if it's not a writeable device */ |
| if ((file->f_mode & FMODE_WRITE) && !(mtd->flags & MTD_WRITEABLE)) { |
| ret = -EACCES; |
| goto out1; |
| } |
| |
| mfi = kzalloc(sizeof(*mfi), GFP_KERNEL); |
| if (!mfi) { |
| ret = -ENOMEM; |
| goto out1; |
| } |
| mfi->mtd = mtd; |
| file->private_data = mfi; |
| mutex_unlock(&mtd_mutex); |
| return 0; |
| |
| out1: |
| put_mtd_device(mtd); |
| out: |
| mutex_unlock(&mtd_mutex); |
| return ret; |
| } /* mtdchar_open */ |
| |
| /*====================================================================*/ |
| |
| static int mtdchar_close(struct inode *inode, struct file *file) |
| { |
| struct mtd_file_info *mfi = file->private_data; |
| struct mtd_info *mtd = mfi->mtd; |
| |
| pr_debug("MTD_close\n"); |
| |
| /* Only sync if opened RW */ |
| if ((file->f_mode & FMODE_WRITE)) |
| mtd_sync(mtd); |
| |
| put_mtd_device(mtd); |
| file->private_data = NULL; |
| kfree(mfi); |
| |
| return 0; |
| } /* mtdchar_close */ |
| |
| /* Back in June 2001, dwmw2 wrote: |
| * |
| * FIXME: This _really_ needs to die. In 2.5, we should lock the |
| * userspace buffer down and use it directly with readv/writev. |
| * |
| * The implementation below, using mtd_kmalloc_up_to, mitigates |
| * allocation failures when the system is under low-memory situations |
| * or if memory is highly fragmented at the cost of reducing the |
| * performance of the requested transfer due to a smaller buffer size. |
| * |
| * A more complex but more memory-efficient implementation based on |
| * get_user_pages and iovecs to cover extents of those pages is a |
| * longer-term goal, as intimated by dwmw2 above. However, for the |
| * write case, this requires yet more complex head and tail transfer |
| * handling when those head and tail offsets and sizes are such that |
| * alignment requirements are not met in the NAND subdriver. |
| */ |
| |
| static ssize_t mtdchar_read(struct file *file, char __user *buf, size_t count, |
| loff_t *ppos) |
| { |
| struct mtd_file_info *mfi = file->private_data; |
| struct mtd_info *mtd = mfi->mtd; |
| size_t retlen; |
| size_t total_retlen=0; |
| int ret=0; |
| int len; |
| size_t size = count; |
| char *kbuf; |
| |
| pr_debug("MTD_read\n"); |
| |
| if (*ppos + count > mtd->size) { |
| if (*ppos < mtd->size) |
| count = mtd->size - *ppos; |
| else |
| count = 0; |
| } |
| |
| if (!count) |
| return 0; |
| |
| kbuf = mtd_kmalloc_up_to(mtd, &size); |
| if (!kbuf) |
| return -ENOMEM; |
| |
| while (count) { |
| len = min_t(size_t, count, size); |
| |
| switch (mfi->mode) { |
| case MTD_FILE_MODE_OTP_FACTORY: |
| ret = mtd_read_fact_prot_reg(mtd, *ppos, len, |
| &retlen, kbuf); |
| break; |
| case MTD_FILE_MODE_OTP_USER: |
| ret = mtd_read_user_prot_reg(mtd, *ppos, len, |
| &retlen, kbuf); |
| break; |
| case MTD_FILE_MODE_RAW: |
| { |
| struct mtd_oob_ops ops; |
| |
| ops.mode = MTD_OPS_RAW; |
| ops.datbuf = kbuf; |
| ops.oobbuf = NULL; |
| ops.len = len; |
| |
| ret = mtd_read_oob(mtd, *ppos, &ops); |
| retlen = ops.retlen; |
| break; |
| } |
| default: |
| ret = mtd_read(mtd, *ppos, len, &retlen, kbuf); |
| } |
| /* Nand returns -EBADMSG on ECC errors, but it returns |
| * the 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. |
| * Userspace software which accesses NAND this way |
| * must be aware of the fact that it deals with NAND |
| */ |
| if (!ret || mtd_is_bitflip_or_eccerr(ret)) { |
| *ppos += retlen; |
| if (copy_to_user(buf, kbuf, retlen)) { |
| kfree(kbuf); |
| return -EFAULT; |
| } |
| else |
| total_retlen += retlen; |
| |
| count -= retlen; |
| buf += retlen; |
| if (retlen == 0) |
| count = 0; |
| } |
| else { |
| kfree(kbuf); |
| return ret; |
| } |
| |
| } |
| |
| kfree(kbuf); |
| return total_retlen; |
| } /* mtdchar_read */ |
| |
| static ssize_t mtdchar_write(struct file *file, const char __user *buf, size_t count, |
| loff_t *ppos) |
| { |
| struct mtd_file_info *mfi = file->private_data; |
| struct mtd_info *mtd = mfi->mtd; |
| size_t size = count; |
| char *kbuf; |
| size_t retlen; |
| size_t total_retlen=0; |
| int ret=0; |
| int len; |
| |
| pr_debug("MTD_write\n"); |
| |
| if (*ppos >= mtd->size) |
| return -ENOSPC; |
| |
| if (*ppos + count > mtd->size) |
| count = mtd->size - *ppos; |
| |
| if (!count) |
| return 0; |
| |
| kbuf = mtd_kmalloc_up_to(mtd, &size); |
| if (!kbuf) |
| return -ENOMEM; |
| |
| while (count) { |
| len = min_t(size_t, count, size); |
| |
| if (copy_from_user(kbuf, buf, len)) { |
| kfree(kbuf); |
| return -EFAULT; |
| } |
| |
| switch (mfi->mode) { |
| case MTD_FILE_MODE_OTP_FACTORY: |
| ret = -EROFS; |
| break; |
| case MTD_FILE_MODE_OTP_USER: |
| ret = mtd_write_user_prot_reg(mtd, *ppos, len, |
| &retlen, kbuf); |
| break; |
| |
| case MTD_FILE_MODE_RAW: |
| { |
| struct mtd_oob_ops ops; |
| |
| ops.mode = MTD_OPS_RAW; |
| ops.datbuf = kbuf; |
| ops.oobbuf = NULL; |
| ops.ooboffs = 0; |
| ops.len = len; |
| |
| ret = mtd_write_oob(mtd, *ppos, &ops); |
| retlen = ops.retlen; |
| break; |
| } |
| |
| default: |
| ret = mtd_write(mtd, *ppos, len, &retlen, kbuf); |
| } |
| |
| /* |
| * Return -ENOSPC only if no data could be written at all. |
| * Otherwise just return the number of bytes that actually |
| * have been written. |
| */ |
| if ((ret == -ENOSPC) && (total_retlen)) |
| break; |
| |
| if (!ret) { |
| *ppos += retlen; |
| total_retlen += retlen; |
| count -= retlen; |
| buf += retlen; |
| } |
| else { |
| kfree(kbuf); |
| return ret; |
| } |
| } |
| |
| kfree(kbuf); |
| return total_retlen; |
| } /* mtdchar_write */ |
| |
| /*====================================================================== |
| |
| IOCTL calls for getting device parameters. |
| |
| ======================================================================*/ |
| |
| static int otp_select_filemode(struct mtd_file_info *mfi, int mode) |
| { |
| struct mtd_info *mtd = mfi->mtd; |
| size_t retlen; |
| |
| switch (mode) { |
| case MTD_OTP_FACTORY: |
| if (mtd_read_fact_prot_reg(mtd, -1, 0, &retlen, NULL) == |
| -EOPNOTSUPP) |
| return -EOPNOTSUPP; |
| |
| mfi->mode = MTD_FILE_MODE_OTP_FACTORY; |
| break; |
| case MTD_OTP_USER: |
| if (mtd_read_user_prot_reg(mtd, -1, 0, &retlen, NULL) == |
| -EOPNOTSUPP) |
| return -EOPNOTSUPP; |
| |
| mfi->mode = MTD_FILE_MODE_OTP_USER; |
| break; |
| case MTD_OTP_OFF: |
| mfi->mode = MTD_FILE_MODE_NORMAL; |
| break; |
| default: |
| return -EINVAL; |
| } |
| |
| return 0; |
| } |
| |
| static int mtdchar_writeoob(struct file *file, struct mtd_info *mtd, |
| uint64_t start, uint32_t length, void __user *ptr, |
| uint32_t __user *retp) |
| { |
| struct mtd_file_info *mfi = file->private_data; |
| struct mtd_oob_ops ops; |
| uint32_t retlen; |
| int ret = 0; |
| |
| if (length > 4096) |
| return -EINVAL; |
| |
| if (!mtd->_write_oob) |
| return -EOPNOTSUPP; |
| |
| ops.ooblen = length; |
| ops.ooboffs = start & (mtd->writesize - 1); |
| ops.datbuf = NULL; |
| ops.mode = (mfi->mode == MTD_FILE_MODE_RAW) ? MTD_OPS_RAW : |
| MTD_OPS_PLACE_OOB; |
| |
| if (ops.ooboffs && ops.ooblen > (mtd->oobsize - ops.ooboffs)) |
| return -EINVAL; |
| |
| ops.oobbuf = memdup_user(ptr, length); |
| if (IS_ERR(ops.oobbuf)) |
| return PTR_ERR(ops.oobbuf); |
| |
| start &= ~((uint64_t)mtd->writesize - 1); |
| ret = mtd_write_oob(mtd, start, &ops); |
| |
| if (ops.oobretlen > 0xFFFFFFFFU) |
| ret = -EOVERFLOW; |
| retlen = ops.oobretlen; |
| if (copy_to_user(retp, &retlen, sizeof(length))) |
| ret = -EFAULT; |
| |
| kfree(ops.oobbuf); |
| return ret; |
| } |
| |
| static int mtdchar_readoob(struct file *file, struct mtd_info *mtd, |
| uint64_t start, uint32_t length, void __user *ptr, |
| uint32_t __user *retp) |
| { |
| struct mtd_file_info *mfi = file->private_data; |
| struct mtd_oob_ops ops; |
| int ret = 0; |
| |
| if (length > 4096) |
| return -EINVAL; |
| |
| ops.ooblen = length; |
| ops.ooboffs = start & (mtd->writesize - 1); |
| ops.datbuf = NULL; |
| ops.mode = (mfi->mode == MTD_FILE_MODE_RAW) ? MTD_OPS_RAW : |
| MTD_OPS_PLACE_OOB; |
| |
| if (ops.ooboffs && ops.ooblen > (mtd->oobsize - ops.ooboffs)) |
| return -EINVAL; |
| |
| ops.oobbuf = kmalloc(length, GFP_KERNEL); |
| if (!ops.oobbuf) |
| return -ENOMEM; |
| |
| start &= ~((uint64_t)mtd->writesize - 1); |
| ret = mtd_read_oob(mtd, start, &ops); |
| |
| if (put_user(ops.oobretlen, retp)) |
| ret = -EFAULT; |
| else if (ops.oobretlen && copy_to_user(ptr, ops.oobbuf, |
| ops.oobretlen)) |
| ret = -EFAULT; |
| |
| kfree(ops.oobbuf); |
| |
| /* |
| * NAND returns -EBADMSG on ECC errors, but it returns the OOB |
| * 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. |
| * |
| * Note: currently the standard NAND function, nand_read_oob_std, |
| * does not calculate ECC for the OOB area, so do not rely on |
| * this behavior unless you have replaced it with your own. |
| */ |
| if (mtd_is_bitflip_or_eccerr(ret)) |
| return 0; |
| |
| return ret; |
| } |
| |
| /* |
| * Copies (and truncates, if necessary) OOB layout information to the |
| * deprecated layout struct, nand_ecclayout_user. This is necessary only to |
| * support the deprecated API ioctl ECCGETLAYOUT while allowing all new |
| * functionality to use mtd_ooblayout_ops flexibly (i.e. mtd_ooblayout_ops |
| * can describe any kind of OOB layout with almost zero overhead from a |
| * memory usage point of view). |
| */ |
| static int shrink_ecclayout(struct mtd_info *mtd, |
| struct nand_ecclayout_user *to) |
| { |
| struct mtd_oob_region oobregion; |
| int i, section = 0, ret; |
| |
| if (!mtd || !to) |
| return -EINVAL; |
| |
| memset(to, 0, sizeof(*to)); |
| |
| to->eccbytes = 0; |
| for (i = 0; i < MTD_MAX_ECCPOS_ENTRIES;) { |
| u32 eccpos; |
| |
| ret = mtd_ooblayout_ecc(mtd, section++, &oobregion); |
| if (ret < 0) { |
| if (ret != -ERANGE) |
| return ret; |
| |
| break; |
| } |
| |
| eccpos = oobregion.offset; |
| for (; i < MTD_MAX_ECCPOS_ENTRIES && |
| eccpos < oobregion.offset + oobregion.length; i++) { |
| to->eccpos[i] = eccpos++; |
| to->eccbytes++; |
| } |
| } |
| |
| for (i = 0; i < MTD_MAX_OOBFREE_ENTRIES; i++) { |
| ret = mtd_ooblayout_free(mtd, i, &oobregion); |
| if (ret < 0) { |
| if (ret != -ERANGE) |
| return ret; |
| |
| break; |
| } |
| |
| to->oobfree[i].offset = oobregion.offset; |
| to->oobfree[i].length = oobregion.length; |
| to->oobavail += to->oobfree[i].length; |
| } |
| |
| return 0; |
| } |
| |
| static int get_oobinfo(struct mtd_info *mtd, struct nand_oobinfo *to) |
| { |
| struct mtd_oob_region oobregion; |
| int i, section = 0, ret; |
| |
| if (!mtd || !to) |
| return -EINVAL; |
| |
| memset(to, 0, sizeof(*to)); |
| |
| to->eccbytes = 0; |
| for (i = 0; i < ARRAY_SIZE(to->eccpos);) { |
| u32 eccpos; |
| |
| ret = mtd_ooblayout_ecc(mtd, section++, &oobregion); |
| if (ret < 0) { |
| if (ret != -ERANGE) |
| return ret; |
| |
| break; |
| } |
| |
| if (oobregion.length + i > ARRAY_SIZE(to->eccpos)) |
| return -EINVAL; |
| |
| eccpos = oobregion.offset; |
| for (; eccpos < oobregion.offset + oobregion.length; i++) { |
| to->eccpos[i] = eccpos++; |
| to->eccbytes++; |
| } |
| } |
| |
| for (i = 0; i < 8; i++) { |
| ret = mtd_ooblayout_free(mtd, i, &oobregion); |
| if (ret < 0) { |
| if (ret != -ERANGE) |
| return ret; |
| |
| break; |
| } |
| |
| to->oobfree[i][0] = oobregion.offset; |
| to->oobfree[i][1] = oobregion.length; |
| } |
| |
| 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; |
| |
| if (!capable(CAP_SYS_ADMIN)) |
| return -EPERM; |
| |
| if (copy_from_user(&p, arg->data, sizeof(p))) |
| return -EFAULT; |
| |
| switch (arg->op) { |
| case BLKPG_ADD_PARTITION: |
| |
| /* Only master mtd device must be used to add partitions */ |
| if (mtd_is_partition(mtd)) |
| return -EINVAL; |
| |
| /* Sanitize user input */ |
| p.devname[BLKPG_DEVNAMELTH - 1] = '\0'; |
| |
| 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; |
| } |
| } |
| |
| static int mtdchar_write_ioctl(struct mtd_info *mtd, |
| struct mtd_write_req __user *argp) |
| { |
| 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 (!mtd->_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; |
| 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 (!mtd->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); |
| break; |
| } |
| |
| case MEMSETBADBLOCK: |
| { |
| loff_t offs; |
| |
| if (copy_from_user(&offs, argp, sizeof(loff_t))) |
| return -EFAULT; |
| return mtd_block_markbad(mtd, offs); |
| break; |
| } |
| |
| 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 (!mtd->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); |