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 ======================================================================*/
331 static void mtdchar_erase_callback (struct erase_info *instr)
333 wake_up((wait_queue_head_t *)instr->priv);
336 static int otp_select_filemode(struct mtd_file_info *mfi, int mode)
338 struct mtd_info *mtd = mfi->mtd;
342 case MTD_OTP_FACTORY:
343 if (mtd_read_fact_prot_reg(mtd, -1, 0, &retlen, NULL) ==
347 mfi->mode = MTD_FILE_MODE_OTP_FACTORY;
350 if (mtd_read_user_prot_reg(mtd, -1, 0, &retlen, NULL) ==
354 mfi->mode = MTD_FILE_MODE_OTP_USER;
357 mfi->mode = MTD_FILE_MODE_NORMAL;
366 static int mtdchar_writeoob(struct file *file, struct mtd_info *mtd,
367 uint64_t start, uint32_t length, void __user *ptr,
368 uint32_t __user *retp)
370 struct mtd_file_info *mfi = file->private_data;
371 struct mtd_oob_ops ops;
378 if (!mtd->_write_oob)
381 ret = access_ok(VERIFY_READ, ptr, length) ? 0 : -EFAULT;
387 ops.ooboffs = start & (mtd->writesize - 1);
389 ops.mode = (mfi->mode == MTD_FILE_MODE_RAW) ? MTD_OPS_RAW :
392 if (ops.ooboffs && ops.ooblen > (mtd->oobsize - ops.ooboffs))
395 ops.oobbuf = memdup_user(ptr, length);
396 if (IS_ERR(ops.oobbuf))
397 return PTR_ERR(ops.oobbuf);
399 start &= ~((uint64_t)mtd->writesize - 1);
400 ret = mtd_write_oob(mtd, start, &ops);
402 if (ops.oobretlen > 0xFFFFFFFFU)
404 retlen = ops.oobretlen;
405 if (copy_to_user(retp, &retlen, sizeof(length)))
412 static int mtdchar_readoob(struct file *file, struct mtd_info *mtd,
413 uint64_t start, uint32_t length, void __user *ptr,
414 uint32_t __user *retp)
416 struct mtd_file_info *mfi = file->private_data;
417 struct mtd_oob_ops ops;
423 if (!access_ok(VERIFY_WRITE, ptr, length))
427 ops.ooboffs = start & (mtd->writesize - 1);
429 ops.mode = (mfi->mode == MTD_FILE_MODE_RAW) ? MTD_OPS_RAW :
432 if (ops.ooboffs && ops.ooblen > (mtd->oobsize - ops.ooboffs))
435 ops.oobbuf = kmalloc(length, GFP_KERNEL);
439 start &= ~((uint64_t)mtd->writesize - 1);
440 ret = mtd_read_oob(mtd, start, &ops);
442 if (put_user(ops.oobretlen, retp))
444 else if (ops.oobretlen && copy_to_user(ptr, ops.oobbuf,
451 * NAND returns -EBADMSG on ECC errors, but it returns the OOB
452 * data. For our userspace tools it is important to dump areas
454 * For kernel internal usage it also might return -EUCLEAN
455 * to signal the caller that a bitflip has occurred and has
456 * been corrected by the ECC algorithm.
458 * Note: currently the standard NAND function, nand_read_oob_std,
459 * does not calculate ECC for the OOB area, so do not rely on
460 * this behavior unless you have replaced it with your own.
462 if (mtd_is_bitflip_or_eccerr(ret))
469 * Copies (and truncates, if necessary) OOB layout information to the
470 * deprecated layout struct, nand_ecclayout_user. This is necessary only to
471 * support the deprecated API ioctl ECCGETLAYOUT while allowing all new
472 * functionality to use mtd_ooblayout_ops flexibly (i.e. mtd_ooblayout_ops
473 * can describe any kind of OOB layout with almost zero overhead from a
474 * memory usage point of view).
476 static int shrink_ecclayout(struct mtd_info *mtd,
477 struct nand_ecclayout_user *to)
479 struct mtd_oob_region oobregion;
480 int i, section = 0, ret;
485 memset(to, 0, sizeof(*to));
488 for (i = 0; i < MTD_MAX_ECCPOS_ENTRIES;) {
491 ret = mtd_ooblayout_ecc(mtd, section++, &oobregion);
499 eccpos = oobregion.offset;
500 for (; i < MTD_MAX_ECCPOS_ENTRIES &&
501 eccpos < oobregion.offset + oobregion.length; i++) {
502 to->eccpos[i] = eccpos++;
507 for (i = 0; i < MTD_MAX_OOBFREE_ENTRIES; i++) {
508 ret = mtd_ooblayout_free(mtd, i, &oobregion);
516 to->oobfree[i].offset = oobregion.offset;
517 to->oobfree[i].length = oobregion.length;
518 to->oobavail += to->oobfree[i].length;
524 static int get_oobinfo(struct mtd_info *mtd, struct nand_oobinfo *to)
526 struct mtd_oob_region oobregion;
527 int i, section = 0, ret;
532 memset(to, 0, sizeof(*to));
535 for (i = 0; i < ARRAY_SIZE(to->eccpos);) {
538 ret = mtd_ooblayout_ecc(mtd, section++, &oobregion);
546 if (oobregion.length + i > ARRAY_SIZE(to->eccpos))
549 eccpos = oobregion.offset;
550 for (; eccpos < oobregion.offset + oobregion.length; i++) {
551 to->eccpos[i] = eccpos++;
556 for (i = 0; i < 8; i++) {
557 ret = mtd_ooblayout_free(mtd, i, &oobregion);
565 to->oobfree[i][0] = oobregion.offset;
566 to->oobfree[i][1] = oobregion.length;
569 to->useecc = MTD_NANDECC_AUTOPLACE;
574 static int mtdchar_blkpg_ioctl(struct mtd_info *mtd,
575 struct blkpg_ioctl_arg *arg)
577 struct blkpg_partition p;
579 if (!capable(CAP_SYS_ADMIN))
582 if (copy_from_user(&p, arg->data, sizeof(p)))
586 case BLKPG_ADD_PARTITION:
588 /* Only master mtd device must be used to add partitions */
589 if (mtd_is_partition(mtd))
592 /* Sanitize user input */
593 p.devname[BLKPG_DEVNAMELTH - 1] = '\0';
595 return mtd_add_partition(mtd, p.devname, p.start, p.length);
597 case BLKPG_DEL_PARTITION:
602 return mtd_del_partition(mtd, p.pno);
609 static int mtdchar_write_ioctl(struct mtd_info *mtd,
610 struct mtd_write_req __user *argp)
612 struct mtd_write_req req;
613 struct mtd_oob_ops ops;
614 const void __user *usr_data, *usr_oob;
617 if (copy_from_user(&req, argp, sizeof(req)))
620 usr_data = (const void __user *)(uintptr_t)req.usr_data;
621 usr_oob = (const void __user *)(uintptr_t)req.usr_oob;
622 if (!access_ok(VERIFY_READ, usr_data, req.len) ||
623 !access_ok(VERIFY_READ, usr_oob, req.ooblen))
626 if (!mtd->_write_oob)
630 ops.len = (size_t)req.len;
631 ops.ooblen = (size_t)req.ooblen;
635 ops.datbuf = memdup_user(usr_data, ops.len);
636 if (IS_ERR(ops.datbuf))
637 return PTR_ERR(ops.datbuf);
643 ops.oobbuf = memdup_user(usr_oob, ops.ooblen);
644 if (IS_ERR(ops.oobbuf)) {
646 return PTR_ERR(ops.oobbuf);
652 ret = mtd_write_oob(mtd, (loff_t)req.start, &ops);
660 static int mtdchar_ioctl(struct file *file, u_int cmd, u_long arg)
662 struct mtd_file_info *mfi = file->private_data;
663 struct mtd_info *mtd = mfi->mtd;
664 void __user *argp = (void __user *)arg;
667 struct mtd_info_user info;
669 pr_debug("MTD_ioctl\n");
671 size = (cmd & IOCSIZE_MASK) >> IOCSIZE_SHIFT;
673 if (!access_ok(VERIFY_READ, argp, size))
677 if (!access_ok(VERIFY_WRITE, argp, size))
682 * Check the file mode to require "dangerous" commands to have write
686 /* "safe" commands */
687 case MEMGETREGIONCOUNT:
688 case MEMGETREGIONINFO:
696 case OTPGETREGIONCOUNT:
697 case OTPGETREGIONINFO:
705 /* "dangerous" commands */
715 if (!(file->f_mode & FMODE_WRITE))
724 case MEMGETREGIONCOUNT:
725 if (copy_to_user(argp, &(mtd->numeraseregions), sizeof(int)))
729 case MEMGETREGIONINFO:
732 struct mtd_erase_region_info *kr;
733 struct region_info_user __user *ur = argp;
735 if (get_user(ur_idx, &(ur->regionindex)))
738 if (ur_idx >= mtd->numeraseregions)
741 kr = &(mtd->eraseregions[ur_idx]);
743 if (put_user(kr->offset, &(ur->offset))
744 || put_user(kr->erasesize, &(ur->erasesize))
745 || put_user(kr->numblocks, &(ur->numblocks)))
752 memset(&info, 0, sizeof(info));
753 info.type = mtd->type;
754 info.flags = mtd->flags;
755 info.size = mtd->size;
756 info.erasesize = mtd->erasesize;
757 info.writesize = mtd->writesize;
758 info.oobsize = mtd->oobsize;
759 /* The below field is obsolete */
761 if (copy_to_user(argp, &info, sizeof(struct mtd_info_user)))
768 struct erase_info *erase;
770 erase=kzalloc(sizeof(struct erase_info),GFP_KERNEL);
774 wait_queue_head_t waitq;
775 DECLARE_WAITQUEUE(wait, current);
777 init_waitqueue_head(&waitq);
779 if (cmd == MEMERASE64) {
780 struct erase_info_user64 einfo64;
782 if (copy_from_user(&einfo64, argp,
783 sizeof(struct erase_info_user64))) {
787 erase->addr = einfo64.start;
788 erase->len = einfo64.length;
790 struct erase_info_user einfo32;
792 if (copy_from_user(&einfo32, argp,
793 sizeof(struct erase_info_user))) {
797 erase->addr = einfo32.start;
798 erase->len = einfo32.length;
801 erase->callback = mtdchar_erase_callback;
802 erase->priv = (unsigned long)&waitq;
805 FIXME: Allow INTERRUPTIBLE. Which means
806 not having the wait_queue head on the stack.
808 If the wq_head is on the stack, and we
809 leave because we got interrupted, then the
810 wq_head is no longer there when the
811 callback routine tries to wake us up.
813 ret = mtd_erase(mtd, erase);
815 set_current_state(TASK_UNINTERRUPTIBLE);
816 add_wait_queue(&waitq, &wait);
817 if (erase->state != MTD_ERASE_DONE &&
818 erase->state != MTD_ERASE_FAILED)
820 remove_wait_queue(&waitq, &wait);
821 set_current_state(TASK_RUNNING);
823 ret = (erase->state == MTD_ERASE_FAILED)?-EIO:0;
832 struct mtd_oob_buf buf;
833 struct mtd_oob_buf __user *buf_user = argp;
835 /* NOTE: writes return length to buf_user->length */
836 if (copy_from_user(&buf, argp, sizeof(buf)))
839 ret = mtdchar_writeoob(file, mtd, buf.start, buf.length,
840 buf.ptr, &buf_user->length);
846 struct mtd_oob_buf buf;
847 struct mtd_oob_buf __user *buf_user = argp;
849 /* NOTE: writes return length to buf_user->start */
850 if (copy_from_user(&buf, argp, sizeof(buf)))
853 ret = mtdchar_readoob(file, mtd, buf.start, buf.length,
854 buf.ptr, &buf_user->start);
860 struct mtd_oob_buf64 buf;
861 struct mtd_oob_buf64 __user *buf_user = argp;
863 if (copy_from_user(&buf, argp, sizeof(buf)))
866 ret = mtdchar_writeoob(file, mtd, buf.start, buf.length,
867 (void __user *)(uintptr_t)buf.usr_ptr,
874 struct mtd_oob_buf64 buf;
875 struct mtd_oob_buf64 __user *buf_user = argp;
877 if (copy_from_user(&buf, argp, sizeof(buf)))
880 ret = mtdchar_readoob(file, mtd, buf.start, buf.length,
881 (void __user *)(uintptr_t)buf.usr_ptr,
888 ret = mtdchar_write_ioctl(mtd,
889 (struct mtd_write_req __user *)arg);
895 struct erase_info_user einfo;
897 if (copy_from_user(&einfo, argp, sizeof(einfo)))
900 ret = mtd_lock(mtd, einfo.start, einfo.length);
906 struct erase_info_user einfo;
908 if (copy_from_user(&einfo, argp, sizeof(einfo)))
911 ret = mtd_unlock(mtd, einfo.start, einfo.length);
917 struct erase_info_user einfo;
919 if (copy_from_user(&einfo, argp, sizeof(einfo)))
922 ret = mtd_is_locked(mtd, einfo.start, einfo.length);
926 /* Legacy interface */
929 struct nand_oobinfo oi;
934 ret = get_oobinfo(mtd, &oi);
938 if (copy_to_user(argp, &oi, sizeof(struct nand_oobinfo)))
947 if (copy_from_user(&offs, argp, sizeof(loff_t)))
949 return mtd_block_isbad(mtd, offs);
957 if (copy_from_user(&offs, argp, sizeof(loff_t)))
959 return mtd_block_markbad(mtd, offs);
966 if (copy_from_user(&mode, argp, sizeof(int)))
969 mfi->mode = MTD_FILE_MODE_NORMAL;
971 ret = otp_select_filemode(mfi, mode);
977 case OTPGETREGIONCOUNT:
978 case OTPGETREGIONINFO:
980 struct otp_info *buf = kmalloc(4096, GFP_KERNEL);
985 case MTD_FILE_MODE_OTP_FACTORY:
986 ret = mtd_get_fact_prot_info(mtd, 4096, &retlen, buf);
988 case MTD_FILE_MODE_OTP_USER:
989 ret = mtd_get_user_prot_info(mtd, 4096, &retlen, buf);
996 if (cmd == OTPGETREGIONCOUNT) {
997 int nbr = retlen / sizeof(struct otp_info);
998 ret = copy_to_user(argp, &nbr, sizeof(int));
1000 ret = copy_to_user(argp, buf, retlen);
1010 struct otp_info oinfo;
1012 if (mfi->mode != MTD_FILE_MODE_OTP_USER)
1014 if (copy_from_user(&oinfo, argp, sizeof(oinfo)))
1016 ret = mtd_lock_user_prot_reg(mtd, oinfo.start, oinfo.length);
1020 /* This ioctl is being deprecated - it truncates the ECC layout */
1023 struct nand_ecclayout_user *usrlay;
1025 if (!mtd->ooblayout)
1028 usrlay = kmalloc(sizeof(*usrlay), GFP_KERNEL);
1032 shrink_ecclayout(mtd, usrlay);
1034 if (copy_to_user(argp, usrlay, sizeof(*usrlay)))
1042 if (copy_to_user(argp, &mtd->ecc_stats,
1043 sizeof(struct mtd_ecc_stats)))
1053 case MTD_FILE_MODE_OTP_FACTORY:
1054 case MTD_FILE_MODE_OTP_USER:
1055 ret = otp_select_filemode(mfi, arg);
1058 case MTD_FILE_MODE_RAW:
1059 if (!mtd_has_oob(mtd))
1063 case MTD_FILE_MODE_NORMAL:
1074 struct blkpg_ioctl_arg __user *blk_arg = argp;
1075 struct blkpg_ioctl_arg a;
1077 if (copy_from_user(&a, blk_arg, sizeof(a)))
1080 ret = mtdchar_blkpg_ioctl(mtd, &a);
1086 /* No reread partition feature. Just return ok */
1093 } /* memory_ioctl */
1095 static long mtdchar_unlocked_ioctl(struct file *file, u_int cmd, u_long arg)
1099 mutex_lock(&mtd_mutex);
1100 ret = mtdchar_ioctl(file, cmd, arg);
1101 mutex_unlock(&mtd_mutex);
1106 #ifdef CONFIG_COMPAT
1108 struct mtd_oob_buf32 {
1111 compat_caddr_t ptr; /* unsigned char* */
1114 #define MEMWRITEOOB32 _IOWR('M', 3, struct mtd_oob_buf32)
1115 #define MEMREADOOB32 _IOWR('M', 4, struct mtd_oob_buf32)
1117 static long mtdchar_compat_ioctl(struct file *file, unsigned int cmd,
1120 struct mtd_file_info *mfi = file->private_data;
1121 struct mtd_info *mtd = mfi->mtd;
1122 void __user *argp = compat_ptr(arg);
1125 mutex_lock(&mtd_mutex);
1130 struct mtd_oob_buf32 buf;
1131 struct mtd_oob_buf32 __user *buf_user = argp;
1133 if (!(file->f_mode & FMODE_WRITE)) {
1138 if (copy_from_user(&buf, argp, sizeof(buf)))
1141 ret = mtdchar_writeoob(file, mtd, buf.start,
1142 buf.length, compat_ptr(buf.ptr),
1149 struct mtd_oob_buf32 buf;
1150 struct mtd_oob_buf32 __user *buf_user = argp;
1152 /* NOTE: writes return length to buf->start */
1153 if (copy_from_user(&buf, argp, sizeof(buf)))
1156 ret = mtdchar_readoob(file, mtd, buf.start,
1157 buf.length, compat_ptr(buf.ptr),
1164 /* Convert from blkpg_compat_ioctl_arg to blkpg_ioctl_arg */
1165 struct blkpg_compat_ioctl_arg __user *uarg = argp;
1166 struct blkpg_compat_ioctl_arg compat_arg;
1167 struct blkpg_ioctl_arg a;
1169 if (copy_from_user(&compat_arg, uarg, sizeof(compat_arg))) {
1174 memset(&a, 0, sizeof(a));
1175 a.op = compat_arg.op;
1176 a.flags = compat_arg.flags;
1177 a.datalen = compat_arg.datalen;
1178 a.data = compat_ptr(compat_arg.data);
1180 ret = mtdchar_blkpg_ioctl(mtd, &a);
1185 ret = mtdchar_ioctl(file, cmd, (unsigned long)argp);
1188 mutex_unlock(&mtd_mutex);
1193 #endif /* CONFIG_COMPAT */
1196 * try to determine where a shared mapping can be made
1197 * - only supported for NOMMU at the moment (MMU can't doesn't copy private
1201 static unsigned long mtdchar_get_unmapped_area(struct file *file,
1204 unsigned long pgoff,
1205 unsigned long flags)
1207 struct mtd_file_info *mfi = file->private_data;
1208 struct mtd_info *mtd = mfi->mtd;
1209 unsigned long offset;
1213 return (unsigned long) -EINVAL;
1215 if (len > mtd->size || pgoff >= (mtd->size >> PAGE_SHIFT))
1216 return (unsigned long) -EINVAL;
1218 offset = pgoff << PAGE_SHIFT;
1219 if (offset > mtd->size - len)
1220 return (unsigned long) -EINVAL;
1222 ret = mtd_get_unmapped_area(mtd, len, offset, flags);
1223 return ret == -EOPNOTSUPP ? -ENODEV : ret;
1226 static unsigned mtdchar_mmap_capabilities(struct file *file)
1228 struct mtd_file_info *mfi = file->private_data;
1230 return mtd_mmap_capabilities(mfi->mtd);
1235 * set up a mapping for shared memory segments
1237 static int mtdchar_mmap(struct file *file, struct vm_area_struct *vma)
1240 struct mtd_file_info *mfi = file->private_data;
1241 struct mtd_info *mtd = mfi->mtd;
1242 struct map_info *map = mtd->priv;
1244 /* This is broken because it assumes the MTD device is map-based
1245 and that mtd->priv is a valid struct map_info. It should be
1246 replaced with something that uses the mtd_get_unmapped_area()
1247 operation properly. */
1248 if (0 /*mtd->type == MTD_RAM || mtd->type == MTD_ROM*/) {
1249 #ifdef pgprot_noncached
1250 if (file->f_flags & O_DSYNC || map->phys >= __pa(high_memory))
1251 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
1253 return vm_iomap_memory(vma, map->phys, map->size);
1257 return vma->vm_flags & VM_SHARED ? 0 : -EACCES;
1261 static const struct file_operations mtd_fops = {
1262 .owner = THIS_MODULE,
1263 .llseek = mtdchar_lseek,
1264 .read = mtdchar_read,
1265 .write = mtdchar_write,
1266 .unlocked_ioctl = mtdchar_unlocked_ioctl,
1267 #ifdef CONFIG_COMPAT
1268 .compat_ioctl = mtdchar_compat_ioctl,
1270 .open = mtdchar_open,
1271 .release = mtdchar_close,
1272 .mmap = mtdchar_mmap,
1274 .get_unmapped_area = mtdchar_get_unmapped_area,
1275 .mmap_capabilities = mtdchar_mmap_capabilities,
1279 int __init init_mtdchar(void)
1283 ret = __register_chrdev(MTD_CHAR_MAJOR, 0, 1 << MINORBITS,
1286 pr_err("Can't allocate major number %d for MTD\n",
1294 void __exit cleanup_mtdchar(void)
1296 __unregister_chrdev(MTD_CHAR_MAJOR, 0, 1 << MINORBITS, "mtd");
1299 MODULE_ALIAS_CHARDEV_MAJOR(MTD_CHAR_MAJOR);