2 * Copyright © 1999-2010 David Woodhouse <dwmw2@infradead.org>
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
20 #include <linux/device.h>
23 #include <linux/err.h>
24 #include <linux/init.h>
25 #include <linux/kernel.h>
26 #include <linux/module.h>
27 #include <linux/slab.h>
28 #include <linux/sched.h>
29 #include <linux/mutex.h>
30 #include <linux/backing-dev.h>
31 #include <linux/compat.h>
32 #include <linux/mount.h>
33 #include <linux/blkpg.h>
34 #include <linux/magic.h>
35 #include <linux/major.h>
36 #include <linux/mtd/mtd.h>
37 #include <linux/mtd/partitions.h>
38 #include <linux/mtd/map.h>
40 #include <linux/uaccess.h>
44 static DEFINE_MUTEX(mtd_mutex);
47 * Data structure to hold the pointer to the mtd device as well
48 * as mode information of various use cases.
50 struct mtd_file_info {
52 enum mtd_file_modes mode;
55 static loff_t mtdchar_lseek(struct file *file, loff_t offset, int orig)
57 struct mtd_file_info *mfi = file->private_data;
58 return fixed_size_llseek(file, offset, orig, mfi->mtd->size);
61 static int mtdchar_open(struct inode *inode, struct file *file)
63 int minor = iminor(inode);
64 int devnum = minor >> 1;
67 struct mtd_file_info *mfi;
69 pr_debug("MTD_open\n");
71 /* You can't open the RO devices RW */
72 if ((file->f_mode & FMODE_WRITE) && (minor & 1))
75 mutex_lock(&mtd_mutex);
76 mtd = get_mtd_device(NULL, devnum);
83 if (mtd->type == MTD_ABSENT) {
88 /* You can't open it RW if it's not a writeable device */
89 if ((file->f_mode & FMODE_WRITE) && !(mtd->flags & MTD_WRITEABLE)) {
94 mfi = kzalloc(sizeof(*mfi), GFP_KERNEL);
100 file->private_data = mfi;
101 mutex_unlock(&mtd_mutex);
107 mutex_unlock(&mtd_mutex);
111 /*====================================================================*/
113 static int mtdchar_close(struct inode *inode, struct file *file)
115 struct mtd_file_info *mfi = file->private_data;
116 struct mtd_info *mtd = mfi->mtd;
118 pr_debug("MTD_close\n");
120 /* Only sync if opened RW */
121 if ((file->f_mode & FMODE_WRITE))
125 file->private_data = NULL;
129 } /* mtdchar_close */
131 /* Back in June 2001, dwmw2 wrote:
133 * FIXME: This _really_ needs to die. In 2.5, we should lock the
134 * userspace buffer down and use it directly with readv/writev.
136 * The implementation below, using mtd_kmalloc_up_to, mitigates
137 * allocation failures when the system is under low-memory situations
138 * or if memory is highly fragmented at the cost of reducing the
139 * performance of the requested transfer due to a smaller buffer size.
141 * A more complex but more memory-efficient implementation based on
142 * get_user_pages and iovecs to cover extents of those pages is a
143 * longer-term goal, as intimated by dwmw2 above. However, for the
144 * write case, this requires yet more complex head and tail transfer
145 * handling when those head and tail offsets and sizes are such that
146 * alignment requirements are not met in the NAND subdriver.
149 static ssize_t mtdchar_read(struct file *file, char __user *buf, size_t count,
152 struct mtd_file_info *mfi = file->private_data;
153 struct mtd_info *mtd = mfi->mtd;
155 size_t total_retlen=0;
161 pr_debug("MTD_read\n");
163 if (*ppos + count > mtd->size) {
164 if (*ppos < mtd->size)
165 count = mtd->size - *ppos;
173 kbuf = mtd_kmalloc_up_to(mtd, &size);
178 len = min_t(size_t, count, size);
181 case MTD_FILE_MODE_OTP_FACTORY:
182 ret = mtd_read_fact_prot_reg(mtd, *ppos, len,
185 case MTD_FILE_MODE_OTP_USER:
186 ret = mtd_read_user_prot_reg(mtd, *ppos, len,
189 case MTD_FILE_MODE_RAW:
191 struct mtd_oob_ops ops;
193 ops.mode = MTD_OPS_RAW;
198 ret = mtd_read_oob(mtd, *ppos, &ops);
203 ret = mtd_read(mtd, *ppos, len, &retlen, kbuf);
205 /* Nand returns -EBADMSG on ECC errors, but it returns
206 * the data. For our userspace tools it is important
207 * to dump areas with ECC errors!
208 * For kernel internal usage it also might return -EUCLEAN
209 * to signal the caller that a bitflip has occurred and has
210 * been corrected by the ECC algorithm.
211 * Userspace software which accesses NAND this way
212 * must be aware of the fact that it deals with NAND
214 if (!ret || mtd_is_bitflip_or_eccerr(ret)) {
216 if (copy_to_user(buf, kbuf, retlen)) {
221 total_retlen += retlen;
239 static ssize_t mtdchar_write(struct file *file, const char __user *buf, size_t count,
242 struct mtd_file_info *mfi = file->private_data;
243 struct mtd_info *mtd = mfi->mtd;
247 size_t total_retlen=0;
251 pr_debug("MTD_write\n");
253 if (*ppos >= mtd->size)
256 if (*ppos + count > mtd->size)
257 count = mtd->size - *ppos;
262 kbuf = mtd_kmalloc_up_to(mtd, &size);
267 len = min_t(size_t, count, size);
269 if (copy_from_user(kbuf, buf, len)) {
275 case MTD_FILE_MODE_OTP_FACTORY:
278 case MTD_FILE_MODE_OTP_USER:
279 ret = mtd_write_user_prot_reg(mtd, *ppos, len,
283 case MTD_FILE_MODE_RAW:
285 struct mtd_oob_ops ops;
287 ops.mode = MTD_OPS_RAW;
293 ret = mtd_write_oob(mtd, *ppos, &ops);
299 ret = mtd_write(mtd, *ppos, len, &retlen, kbuf);
303 * Return -ENOSPC only if no data could be written at all.
304 * Otherwise just return the number of bytes that actually
307 if ((ret == -ENOSPC) && (total_retlen))
312 total_retlen += retlen;
324 } /* mtdchar_write */
326 /*======================================================================
328 IOCTL calls for getting device parameters.
330 ======================================================================*/
332 static int otp_select_filemode(struct mtd_file_info *mfi, int mode)
334 struct mtd_info *mtd = mfi->mtd;
338 case MTD_OTP_FACTORY:
339 if (mtd_read_fact_prot_reg(mtd, -1, 0, &retlen, NULL) ==
343 mfi->mode = MTD_FILE_MODE_OTP_FACTORY;
346 if (mtd_read_user_prot_reg(mtd, -1, 0, &retlen, NULL) ==
350 mfi->mode = MTD_FILE_MODE_OTP_USER;
353 mfi->mode = MTD_FILE_MODE_NORMAL;
362 static int mtdchar_writeoob(struct file *file, struct mtd_info *mtd,
363 uint64_t start, uint32_t length, void __user *ptr,
364 uint32_t __user *retp)
366 struct mtd_file_info *mfi = file->private_data;
367 struct mtd_oob_ops ops;
374 if (!mtd->_write_oob)
378 ops.ooboffs = start & (mtd->writesize - 1);
380 ops.mode = (mfi->mode == MTD_FILE_MODE_RAW) ? MTD_OPS_RAW :
383 if (ops.ooboffs && ops.ooblen > (mtd->oobsize - ops.ooboffs))
386 ops.oobbuf = memdup_user(ptr, length);
387 if (IS_ERR(ops.oobbuf))
388 return PTR_ERR(ops.oobbuf);
390 start &= ~((uint64_t)mtd->writesize - 1);
391 ret = mtd_write_oob(mtd, start, &ops);
393 if (ops.oobretlen > 0xFFFFFFFFU)
395 retlen = ops.oobretlen;
396 if (copy_to_user(retp, &retlen, sizeof(length)))
403 static int mtdchar_readoob(struct file *file, struct mtd_info *mtd,
404 uint64_t start, uint32_t length, void __user *ptr,
405 uint32_t __user *retp)
407 struct mtd_file_info *mfi = file->private_data;
408 struct mtd_oob_ops ops;
415 ops.ooboffs = start & (mtd->writesize - 1);
417 ops.mode = (mfi->mode == MTD_FILE_MODE_RAW) ? MTD_OPS_RAW :
420 if (ops.ooboffs && ops.ooblen > (mtd->oobsize - ops.ooboffs))
423 ops.oobbuf = kmalloc(length, GFP_KERNEL);
427 start &= ~((uint64_t)mtd->writesize - 1);
428 ret = mtd_read_oob(mtd, start, &ops);
430 if (put_user(ops.oobretlen, retp))
432 else if (ops.oobretlen && copy_to_user(ptr, ops.oobbuf,
439 * NAND returns -EBADMSG on ECC errors, but it returns the OOB
440 * data. For our userspace tools it is important to dump areas
442 * For kernel internal usage it also might return -EUCLEAN
443 * to signal the caller that a bitflip has occurred and has
444 * been corrected by the ECC algorithm.
446 * Note: currently the standard NAND function, nand_read_oob_std,
447 * does not calculate ECC for the OOB area, so do not rely on
448 * this behavior unless you have replaced it with your own.
450 if (mtd_is_bitflip_or_eccerr(ret))
457 * Copies (and truncates, if necessary) OOB layout information to the
458 * deprecated layout struct, nand_ecclayout_user. This is necessary only to
459 * support the deprecated API ioctl ECCGETLAYOUT while allowing all new
460 * functionality to use mtd_ooblayout_ops flexibly (i.e. mtd_ooblayout_ops
461 * can describe any kind of OOB layout with almost zero overhead from a
462 * memory usage point of view).
464 static int shrink_ecclayout(struct mtd_info *mtd,
465 struct nand_ecclayout_user *to)
467 struct mtd_oob_region oobregion;
468 int i, section = 0, ret;
473 memset(to, 0, sizeof(*to));
476 for (i = 0; i < MTD_MAX_ECCPOS_ENTRIES;) {
479 ret = mtd_ooblayout_ecc(mtd, section++, &oobregion);
487 eccpos = oobregion.offset;
488 for (; i < MTD_MAX_ECCPOS_ENTRIES &&
489 eccpos < oobregion.offset + oobregion.length; i++) {
490 to->eccpos[i] = eccpos++;
495 for (i = 0; i < MTD_MAX_OOBFREE_ENTRIES; i++) {
496 ret = mtd_ooblayout_free(mtd, i, &oobregion);
504 to->oobfree[i].offset = oobregion.offset;
505 to->oobfree[i].length = oobregion.length;
506 to->oobavail += to->oobfree[i].length;
512 static int get_oobinfo(struct mtd_info *mtd, struct nand_oobinfo *to)
514 struct mtd_oob_region oobregion;
515 int i, section = 0, ret;
520 memset(to, 0, sizeof(*to));
523 for (i = 0; i < ARRAY_SIZE(to->eccpos);) {
526 ret = mtd_ooblayout_ecc(mtd, section++, &oobregion);
534 if (oobregion.length + i > ARRAY_SIZE(to->eccpos))
537 eccpos = oobregion.offset;
538 for (; eccpos < oobregion.offset + oobregion.length; i++) {
539 to->eccpos[i] = eccpos++;
544 for (i = 0; i < 8; i++) {
545 ret = mtd_ooblayout_free(mtd, i, &oobregion);
553 to->oobfree[i][0] = oobregion.offset;
554 to->oobfree[i][1] = oobregion.length;
557 to->useecc = MTD_NANDECC_AUTOPLACE;
562 static int mtdchar_blkpg_ioctl(struct mtd_info *mtd,
563 struct blkpg_ioctl_arg *arg)
565 struct blkpg_partition p;
567 if (!capable(CAP_SYS_ADMIN))
570 if (copy_from_user(&p, arg->data, sizeof(p)))
574 case BLKPG_ADD_PARTITION:
576 /* Only master mtd device must be used to add partitions */
577 if (mtd_is_partition(mtd))
580 /* Sanitize user input */
581 p.devname[BLKPG_DEVNAMELTH - 1] = '\0';
583 return mtd_add_partition(mtd, p.devname, p.start, p.length);
585 case BLKPG_DEL_PARTITION:
590 return mtd_del_partition(mtd, p.pno);
597 static int mtdchar_write_ioctl(struct mtd_info *mtd,
598 struct mtd_write_req __user *argp)
600 struct mtd_write_req req;
601 struct mtd_oob_ops ops;
602 const void __user *usr_data, *usr_oob;
605 if (copy_from_user(&req, argp, sizeof(req)))
608 usr_data = (const void __user *)(uintptr_t)req.usr_data;
609 usr_oob = (const void __user *)(uintptr_t)req.usr_oob;
611 if (!mtd->_write_oob)
615 ops.len = (size_t)req.len;
616 ops.ooblen = (size_t)req.ooblen;
620 ops.datbuf = memdup_user(usr_data, ops.len);
621 if (IS_ERR(ops.datbuf))
622 return PTR_ERR(ops.datbuf);
628 ops.oobbuf = memdup_user(usr_oob, ops.ooblen);
629 if (IS_ERR(ops.oobbuf)) {
631 return PTR_ERR(ops.oobbuf);
637 ret = mtd_write_oob(mtd, (loff_t)req.start, &ops);
645 static int mtdchar_ioctl(struct file *file, u_int cmd, u_long arg)
647 struct mtd_file_info *mfi = file->private_data;
648 struct mtd_info *mtd = mfi->mtd;
649 void __user *argp = (void __user *)arg;
651 struct mtd_info_user info;
653 pr_debug("MTD_ioctl\n");
656 * Check the file mode to require "dangerous" commands to have write
660 /* "safe" commands */
661 case MEMGETREGIONCOUNT:
662 case MEMGETREGIONINFO:
670 case OTPGETREGIONCOUNT:
671 case OTPGETREGIONINFO:
679 /* "dangerous" commands */
689 if (!(file->f_mode & FMODE_WRITE))
698 case MEMGETREGIONCOUNT:
699 if (copy_to_user(argp, &(mtd->numeraseregions), sizeof(int)))
703 case MEMGETREGIONINFO:
706 struct mtd_erase_region_info *kr;
707 struct region_info_user __user *ur = argp;
709 if (get_user(ur_idx, &(ur->regionindex)))
712 if (ur_idx >= mtd->numeraseregions)
715 kr = &(mtd->eraseregions[ur_idx]);
717 if (put_user(kr->offset, &(ur->offset))
718 || put_user(kr->erasesize, &(ur->erasesize))
719 || put_user(kr->numblocks, &(ur->numblocks)))
726 memset(&info, 0, sizeof(info));
727 info.type = mtd->type;
728 info.flags = mtd->flags;
729 info.size = mtd->size;
730 info.erasesize = mtd->erasesize;
731 info.writesize = mtd->writesize;
732 info.oobsize = mtd->oobsize;
733 /* The below field is obsolete */
735 if (copy_to_user(argp, &info, sizeof(struct mtd_info_user)))
742 struct erase_info *erase;
744 erase=kzalloc(sizeof(struct erase_info),GFP_KERNEL);
748 if (cmd == MEMERASE64) {
749 struct erase_info_user64 einfo64;
751 if (copy_from_user(&einfo64, argp,
752 sizeof(struct erase_info_user64))) {
756 erase->addr = einfo64.start;
757 erase->len = einfo64.length;
759 struct erase_info_user einfo32;
761 if (copy_from_user(&einfo32, argp,
762 sizeof(struct erase_info_user))) {
766 erase->addr = einfo32.start;
767 erase->len = einfo32.length;
770 ret = mtd_erase(mtd, erase);
778 struct mtd_oob_buf buf;
779 struct mtd_oob_buf __user *buf_user = argp;
781 /* NOTE: writes return length to buf_user->length */
782 if (copy_from_user(&buf, argp, sizeof(buf)))
785 ret = mtdchar_writeoob(file, mtd, buf.start, buf.length,
786 buf.ptr, &buf_user->length);
792 struct mtd_oob_buf buf;
793 struct mtd_oob_buf __user *buf_user = argp;
795 /* NOTE: writes return length to buf_user->start */
796 if (copy_from_user(&buf, argp, sizeof(buf)))
799 ret = mtdchar_readoob(file, mtd, buf.start, buf.length,
800 buf.ptr, &buf_user->start);
806 struct mtd_oob_buf64 buf;
807 struct mtd_oob_buf64 __user *buf_user = argp;
809 if (copy_from_user(&buf, argp, sizeof(buf)))
812 ret = mtdchar_writeoob(file, mtd, buf.start, buf.length,
813 (void __user *)(uintptr_t)buf.usr_ptr,
820 struct mtd_oob_buf64 buf;
821 struct mtd_oob_buf64 __user *buf_user = argp;
823 if (copy_from_user(&buf, argp, sizeof(buf)))
826 ret = mtdchar_readoob(file, mtd, buf.start, buf.length,
827 (void __user *)(uintptr_t)buf.usr_ptr,
834 ret = mtdchar_write_ioctl(mtd,
835 (struct mtd_write_req __user *)arg);
841 struct erase_info_user einfo;
843 if (copy_from_user(&einfo, argp, sizeof(einfo)))
846 ret = mtd_lock(mtd, einfo.start, einfo.length);
852 struct erase_info_user einfo;
854 if (copy_from_user(&einfo, argp, sizeof(einfo)))
857 ret = mtd_unlock(mtd, einfo.start, einfo.length);
863 struct erase_info_user einfo;
865 if (copy_from_user(&einfo, argp, sizeof(einfo)))
868 ret = mtd_is_locked(mtd, einfo.start, einfo.length);
872 /* Legacy interface */
875 struct nand_oobinfo oi;
880 ret = get_oobinfo(mtd, &oi);
884 if (copy_to_user(argp, &oi, sizeof(struct nand_oobinfo)))
893 if (copy_from_user(&offs, argp, sizeof(loff_t)))
895 return mtd_block_isbad(mtd, offs);
903 if (copy_from_user(&offs, argp, sizeof(loff_t)))
905 return mtd_block_markbad(mtd, offs);
912 if (copy_from_user(&mode, argp, sizeof(int)))
915 mfi->mode = MTD_FILE_MODE_NORMAL;
917 ret = otp_select_filemode(mfi, mode);
923 case OTPGETREGIONCOUNT:
924 case OTPGETREGIONINFO:
926 struct otp_info *buf = kmalloc(4096, GFP_KERNEL);
931 case MTD_FILE_MODE_OTP_FACTORY:
932 ret = mtd_get_fact_prot_info(mtd, 4096, &retlen, buf);
934 case MTD_FILE_MODE_OTP_USER:
935 ret = mtd_get_user_prot_info(mtd, 4096, &retlen, buf);
942 if (cmd == OTPGETREGIONCOUNT) {
943 int nbr = retlen / sizeof(struct otp_info);
944 ret = copy_to_user(argp, &nbr, sizeof(int));
946 ret = copy_to_user(argp, buf, retlen);
956 struct otp_info oinfo;
958 if (mfi->mode != MTD_FILE_MODE_OTP_USER)
960 if (copy_from_user(&oinfo, argp, sizeof(oinfo)))
962 ret = mtd_lock_user_prot_reg(mtd, oinfo.start, oinfo.length);
966 /* This ioctl is being deprecated - it truncates the ECC layout */
969 struct nand_ecclayout_user *usrlay;
974 usrlay = kmalloc(sizeof(*usrlay), GFP_KERNEL);
978 shrink_ecclayout(mtd, usrlay);
980 if (copy_to_user(argp, usrlay, sizeof(*usrlay)))
988 if (copy_to_user(argp, &mtd->ecc_stats,
989 sizeof(struct mtd_ecc_stats)))
999 case MTD_FILE_MODE_OTP_FACTORY:
1000 case MTD_FILE_MODE_OTP_USER:
1001 ret = otp_select_filemode(mfi, arg);
1004 case MTD_FILE_MODE_RAW:
1005 if (!mtd_has_oob(mtd))
1009 case MTD_FILE_MODE_NORMAL:
1020 struct blkpg_ioctl_arg __user *blk_arg = argp;
1021 struct blkpg_ioctl_arg a;
1023 if (copy_from_user(&a, blk_arg, sizeof(a)))
1026 ret = mtdchar_blkpg_ioctl(mtd, &a);
1032 /* No reread partition feature. Just return ok */
1039 } /* memory_ioctl */
1041 static long mtdchar_unlocked_ioctl(struct file *file, u_int cmd, u_long arg)
1045 mutex_lock(&mtd_mutex);
1046 ret = mtdchar_ioctl(file, cmd, arg);
1047 mutex_unlock(&mtd_mutex);
1052 #ifdef CONFIG_COMPAT
1054 struct mtd_oob_buf32 {
1057 compat_caddr_t ptr; /* unsigned char* */
1060 #define MEMWRITEOOB32 _IOWR('M', 3, struct mtd_oob_buf32)
1061 #define MEMREADOOB32 _IOWR('M', 4, struct mtd_oob_buf32)
1063 static long mtdchar_compat_ioctl(struct file *file, unsigned int cmd,
1066 struct mtd_file_info *mfi = file->private_data;
1067 struct mtd_info *mtd = mfi->mtd;
1068 void __user *argp = compat_ptr(arg);
1071 mutex_lock(&mtd_mutex);
1076 struct mtd_oob_buf32 buf;
1077 struct mtd_oob_buf32 __user *buf_user = argp;
1079 if (!(file->f_mode & FMODE_WRITE)) {
1084 if (copy_from_user(&buf, argp, sizeof(buf)))
1087 ret = mtdchar_writeoob(file, mtd, buf.start,
1088 buf.length, compat_ptr(buf.ptr),
1095 struct mtd_oob_buf32 buf;
1096 struct mtd_oob_buf32 __user *buf_user = argp;
1098 /* NOTE: writes return length to buf->start */
1099 if (copy_from_user(&buf, argp, sizeof(buf)))
1102 ret = mtdchar_readoob(file, mtd, buf.start,
1103 buf.length, compat_ptr(buf.ptr),
1110 /* Convert from blkpg_compat_ioctl_arg to blkpg_ioctl_arg */
1111 struct blkpg_compat_ioctl_arg __user *uarg = argp;
1112 struct blkpg_compat_ioctl_arg compat_arg;
1113 struct blkpg_ioctl_arg a;
1115 if (copy_from_user(&compat_arg, uarg, sizeof(compat_arg))) {
1120 memset(&a, 0, sizeof(a));
1121 a.op = compat_arg.op;
1122 a.flags = compat_arg.flags;
1123 a.datalen = compat_arg.datalen;
1124 a.data = compat_ptr(compat_arg.data);
1126 ret = mtdchar_blkpg_ioctl(mtd, &a);
1131 ret = mtdchar_ioctl(file, cmd, (unsigned long)argp);
1134 mutex_unlock(&mtd_mutex);
1139 #endif /* CONFIG_COMPAT */
1142 * try to determine where a shared mapping can be made
1143 * - only supported for NOMMU at the moment (MMU can't doesn't copy private
1147 static unsigned long mtdchar_get_unmapped_area(struct file *file,
1150 unsigned long pgoff,
1151 unsigned long flags)
1153 struct mtd_file_info *mfi = file->private_data;
1154 struct mtd_info *mtd = mfi->mtd;
1155 unsigned long offset;
1159 return (unsigned long) -EINVAL;
1161 if (len > mtd->size || pgoff >= (mtd->size >> PAGE_SHIFT))
1162 return (unsigned long) -EINVAL;
1164 offset = pgoff << PAGE_SHIFT;
1165 if (offset > mtd->size - len)
1166 return (unsigned long) -EINVAL;
1168 ret = mtd_get_unmapped_area(mtd, len, offset, flags);
1169 return ret == -EOPNOTSUPP ? -ENODEV : ret;
1172 static unsigned mtdchar_mmap_capabilities(struct file *file)
1174 struct mtd_file_info *mfi = file->private_data;
1176 return mtd_mmap_capabilities(mfi->mtd);
1181 * set up a mapping for shared memory segments
1183 static int mtdchar_mmap(struct file *file, struct vm_area_struct *vma)
1186 struct mtd_file_info *mfi = file->private_data;
1187 struct mtd_info *mtd = mfi->mtd;
1188 struct map_info *map = mtd->priv;
1190 /* This is broken because it assumes the MTD device is map-based
1191 and that mtd->priv is a valid struct map_info. It should be
1192 replaced with something that uses the mtd_get_unmapped_area()
1193 operation properly. */
1194 if (0 /*mtd->type == MTD_RAM || mtd->type == MTD_ROM*/) {
1195 #ifdef pgprot_noncached
1196 if (file->f_flags & O_DSYNC || map->phys >= __pa(high_memory))
1197 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
1199 return vm_iomap_memory(vma, map->phys, map->size);
1203 return vma->vm_flags & VM_SHARED ? 0 : -EACCES;
1207 static const struct file_operations mtd_fops = {
1208 .owner = THIS_MODULE,
1209 .llseek = mtdchar_lseek,
1210 .read = mtdchar_read,
1211 .write = mtdchar_write,
1212 .unlocked_ioctl = mtdchar_unlocked_ioctl,
1213 #ifdef CONFIG_COMPAT
1214 .compat_ioctl = mtdchar_compat_ioctl,
1216 .open = mtdchar_open,
1217 .release = mtdchar_close,
1218 .mmap = mtdchar_mmap,
1220 .get_unmapped_area = mtdchar_get_unmapped_area,
1221 .mmap_capabilities = mtdchar_mmap_capabilities,
1225 int __init init_mtdchar(void)
1229 ret = __register_chrdev(MTD_CHAR_MAJOR, 0, 1 << MINORBITS,
1232 pr_err("Can't allocate major number %d for MTD\n",
1240 void __exit cleanup_mtdchar(void)
1242 __unregister_chrdev(MTD_CHAR_MAJOR, 0, 1 << MINORBITS, "mtd");
1245 MODULE_ALIAS_CHARDEV_MAJOR(MTD_CHAR_MAJOR);