diff options
Diffstat (limited to '')
| -rw-r--r-- | drivers/mtd/mtdchar.c | 1233 |
1 files changed, 1233 insertions, 0 deletions
diff --git a/drivers/mtd/mtdchar.c b/drivers/mtd/mtdchar.c new file mode 100644 index 000000000..69fb5dafa --- /dev/null +++ b/drivers/mtd/mtdchar.c @@ -0,0 +1,1233 @@ +// 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_info *master = mtd_get_master(mtd); + 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 (!master->_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_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); + 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 (!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); |