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 <asm/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
{
53 enum mtd_file_modes mode
;
56 static loff_t
mtdchar_lseek(struct file
*file
, loff_t offset
, int orig
)
58 struct mtd_file_info
*mfi
= file
->private_data
;
59 return fixed_size_llseek(file
, offset
, orig
, mfi
->mtd
->size
);
63 static struct vfsmount
*mnt
;
64 static struct file_system_type mtd_inodefs_type
;
66 static int mtdchar_open(struct inode
*inode
, struct file
*file
)
68 int minor
= iminor(inode
);
69 int devnum
= minor
>> 1;
72 struct mtd_file_info
*mfi
;
73 struct inode
*mtd_ino
;
75 pr_debug("MTD_open\n");
77 /* You can't open the RO devices RW */
78 if ((file
->f_mode
& FMODE_WRITE
) && (minor
& 1))
81 ret
= simple_pin_fs(&mtd_inodefs_type
, &mnt
, &count
);
85 mutex_lock(&mtd_mutex
);
86 mtd
= get_mtd_device(NULL
, devnum
);
93 if (mtd
->type
== MTD_ABSENT
) {
98 mtd_ino
= iget_locked(mnt
->mnt_sb
, devnum
);
103 if (mtd_ino
->i_state
& I_NEW
) {
104 mtd_ino
->i_private
= mtd
;
105 mtd_ino
->i_mode
= S_IFCHR
;
106 mtd_ino
->i_data
.backing_dev_info
= mtd
->backing_dev_info
;
107 unlock_new_inode(mtd_ino
);
109 file
->f_mapping
= mtd_ino
->i_mapping
;
111 /* You can't open it RW if it's not a writeable device */
112 if ((file
->f_mode
& FMODE_WRITE
) && !(mtd
->flags
& MTD_WRITEABLE
)) {
117 mfi
= kzalloc(sizeof(*mfi
), GFP_KERNEL
);
124 file
->private_data
= mfi
;
125 mutex_unlock(&mtd_mutex
);
133 mutex_unlock(&mtd_mutex
);
134 simple_release_fs(&mnt
, &count
);
138 /*====================================================================*/
140 static int mtdchar_close(struct inode
*inode
, struct file
*file
)
142 struct mtd_file_info
*mfi
= file
->private_data
;
143 struct mtd_info
*mtd
= mfi
->mtd
;
145 pr_debug("MTD_close\n");
147 /* Only sync if opened RW */
148 if ((file
->f_mode
& FMODE_WRITE
))
154 file
->private_data
= NULL
;
156 simple_release_fs(&mnt
, &count
);
159 } /* mtdchar_close */
161 /* Back in June 2001, dwmw2 wrote:
163 * FIXME: This _really_ needs to die. In 2.5, we should lock the
164 * userspace buffer down and use it directly with readv/writev.
166 * The implementation below, using mtd_kmalloc_up_to, mitigates
167 * allocation failures when the system is under low-memory situations
168 * or if memory is highly fragmented at the cost of reducing the
169 * performance of the requested transfer due to a smaller buffer size.
171 * A more complex but more memory-efficient implementation based on
172 * get_user_pages and iovecs to cover extents of those pages is a
173 * longer-term goal, as intimated by dwmw2 above. However, for the
174 * write case, this requires yet more complex head and tail transfer
175 * handling when those head and tail offsets and sizes are such that
176 * alignment requirements are not met in the NAND subdriver.
179 static ssize_t
mtdchar_read(struct file
*file
, char __user
*buf
, size_t count
,
182 struct mtd_file_info
*mfi
= file
->private_data
;
183 struct mtd_info
*mtd
= mfi
->mtd
;
185 size_t total_retlen
=0;
191 pr_debug("MTD_read\n");
193 if (*ppos
+ count
> mtd
->size
)
194 count
= mtd
->size
- *ppos
;
199 kbuf
= mtd_kmalloc_up_to(mtd
, &size
);
204 len
= min_t(size_t, count
, size
);
207 case MTD_FILE_MODE_OTP_FACTORY
:
208 ret
= mtd_read_fact_prot_reg(mtd
, *ppos
, len
,
211 case MTD_FILE_MODE_OTP_USER
:
212 ret
= mtd_read_user_prot_reg(mtd
, *ppos
, len
,
215 case MTD_FILE_MODE_RAW
:
217 struct mtd_oob_ops ops
;
219 ops
.mode
= MTD_OPS_RAW
;
224 ret
= mtd_read_oob(mtd
, *ppos
, &ops
);
229 ret
= mtd_read(mtd
, *ppos
, len
, &retlen
, kbuf
);
231 /* Nand returns -EBADMSG on ECC errors, but it returns
232 * the data. For our userspace tools it is important
233 * to dump areas with ECC errors!
234 * For kernel internal usage it also might return -EUCLEAN
235 * to signal the caller that a bitflip has occurred and has
236 * been corrected by the ECC algorithm.
237 * Userspace software which accesses NAND this way
238 * must be aware of the fact that it deals with NAND
240 if (!ret
|| mtd_is_bitflip_or_eccerr(ret
)) {
242 if (copy_to_user(buf
, kbuf
, retlen
)) {
247 total_retlen
+= retlen
;
265 static ssize_t
mtdchar_write(struct file
*file
, const char __user
*buf
, size_t count
,
268 struct mtd_file_info
*mfi
= file
->private_data
;
269 struct mtd_info
*mtd
= mfi
->mtd
;
273 size_t total_retlen
=0;
277 pr_debug("MTD_write\n");
279 if (*ppos
== mtd
->size
)
282 if (*ppos
+ count
> mtd
->size
)
283 count
= mtd
->size
- *ppos
;
288 kbuf
= mtd_kmalloc_up_to(mtd
, &size
);
293 len
= min_t(size_t, count
, size
);
295 if (copy_from_user(kbuf
, buf
, len
)) {
301 case MTD_FILE_MODE_OTP_FACTORY
:
304 case MTD_FILE_MODE_OTP_USER
:
305 ret
= mtd_write_user_prot_reg(mtd
, *ppos
, len
,
309 case MTD_FILE_MODE_RAW
:
311 struct mtd_oob_ops ops
;
313 ops
.mode
= MTD_OPS_RAW
;
319 ret
= mtd_write_oob(mtd
, *ppos
, &ops
);
325 ret
= mtd_write(mtd
, *ppos
, len
, &retlen
, kbuf
);
329 * Return -ENOSPC only if no data could be written at all.
330 * Otherwise just return the number of bytes that actually
333 if ((ret
== -ENOSPC
) && (total_retlen
))
338 total_retlen
+= retlen
;
350 } /* mtdchar_write */
352 /*======================================================================
354 IOCTL calls for getting device parameters.
356 ======================================================================*/
357 static void mtdchar_erase_callback (struct erase_info
*instr
)
359 wake_up((wait_queue_head_t
*)instr
->priv
);
362 static int otp_select_filemode(struct mtd_file_info
*mfi
, int mode
)
364 struct mtd_info
*mtd
= mfi
->mtd
;
368 case MTD_OTP_FACTORY
:
369 if (mtd_read_fact_prot_reg(mtd
, -1, 0, &retlen
, NULL
) ==
373 mfi
->mode
= MTD_FILE_MODE_OTP_FACTORY
;
376 if (mtd_read_user_prot_reg(mtd
, -1, 0, &retlen
, NULL
) ==
380 mfi
->mode
= MTD_FILE_MODE_OTP_USER
;
383 mfi
->mode
= MTD_FILE_MODE_NORMAL
;
392 static int mtdchar_writeoob(struct file
*file
, struct mtd_info
*mtd
,
393 uint64_t start
, uint32_t length
, void __user
*ptr
,
394 uint32_t __user
*retp
)
396 struct mtd_file_info
*mfi
= file
->private_data
;
397 struct mtd_oob_ops ops
;
401 if (!(file
->f_mode
& FMODE_WRITE
))
407 if (!mtd
->_write_oob
)
410 ret
= access_ok(VERIFY_READ
, ptr
, length
) ? 0 : -EFAULT
;
416 ops
.ooboffs
= start
& (mtd
->writesize
- 1);
418 ops
.mode
= (mfi
->mode
== MTD_FILE_MODE_RAW
) ? MTD_OPS_RAW
:
421 if (ops
.ooboffs
&& ops
.ooblen
> (mtd
->oobsize
- ops
.ooboffs
))
424 ops
.oobbuf
= memdup_user(ptr
, length
);
425 if (IS_ERR(ops
.oobbuf
))
426 return PTR_ERR(ops
.oobbuf
);
428 start
&= ~((uint64_t)mtd
->writesize
- 1);
429 ret
= mtd_write_oob(mtd
, start
, &ops
);
431 if (ops
.oobretlen
> 0xFFFFFFFFU
)
433 retlen
= ops
.oobretlen
;
434 if (copy_to_user(retp
, &retlen
, sizeof(length
)))
441 static int mtdchar_readoob(struct file
*file
, struct mtd_info
*mtd
,
442 uint64_t start
, uint32_t length
, void __user
*ptr
,
443 uint32_t __user
*retp
)
445 struct mtd_file_info
*mfi
= file
->private_data
;
446 struct mtd_oob_ops ops
;
452 if (!access_ok(VERIFY_WRITE
, ptr
, length
))
456 ops
.ooboffs
= start
& (mtd
->writesize
- 1);
458 ops
.mode
= (mfi
->mode
== MTD_FILE_MODE_RAW
) ? MTD_OPS_RAW
:
461 if (ops
.ooboffs
&& ops
.ooblen
> (mtd
->oobsize
- ops
.ooboffs
))
464 ops
.oobbuf
= kmalloc(length
, GFP_KERNEL
);
468 start
&= ~((uint64_t)mtd
->writesize
- 1);
469 ret
= mtd_read_oob(mtd
, start
, &ops
);
471 if (put_user(ops
.oobretlen
, retp
))
473 else if (ops
.oobretlen
&& copy_to_user(ptr
, ops
.oobbuf
,
480 * NAND returns -EBADMSG on ECC errors, but it returns the OOB
481 * data. For our userspace tools it is important to dump areas
483 * For kernel internal usage it also might return -EUCLEAN
484 * to signal the caller that a bitflip has occured and has
485 * been corrected by the ECC algorithm.
487 * Note: currently the standard NAND function, nand_read_oob_std,
488 * does not calculate ECC for the OOB area, so do not rely on
489 * this behavior unless you have replaced it with your own.
491 if (mtd_is_bitflip_or_eccerr(ret
))
498 * Copies (and truncates, if necessary) data from the larger struct,
499 * nand_ecclayout, to the smaller, deprecated layout struct,
500 * nand_ecclayout_user. This is necessary only to support the deprecated
501 * API ioctl ECCGETLAYOUT while allowing all new functionality to use
502 * nand_ecclayout flexibly (i.e. the struct may change size in new
503 * releases without requiring major rewrites).
505 static int shrink_ecclayout(const struct nand_ecclayout
*from
,
506 struct nand_ecclayout_user
*to
)
513 memset(to
, 0, sizeof(*to
));
515 to
->eccbytes
= min((int)from
->eccbytes
, MTD_MAX_ECCPOS_ENTRIES
);
516 for (i
= 0; i
< to
->eccbytes
; i
++)
517 to
->eccpos
[i
] = from
->eccpos
[i
];
519 for (i
= 0; i
< MTD_MAX_OOBFREE_ENTRIES
; i
++) {
520 if (from
->oobfree
[i
].length
== 0 &&
521 from
->oobfree
[i
].offset
== 0)
523 to
->oobavail
+= from
->oobfree
[i
].length
;
524 to
->oobfree
[i
] = from
->oobfree
[i
];
530 static int mtdchar_blkpg_ioctl(struct mtd_info
*mtd
,
531 struct blkpg_ioctl_arg __user
*arg
)
533 struct blkpg_ioctl_arg a
;
534 struct blkpg_partition p
;
536 if (!capable(CAP_SYS_ADMIN
))
539 if (copy_from_user(&a
, arg
, sizeof(struct blkpg_ioctl_arg
)))
542 if (copy_from_user(&p
, a
.data
, sizeof(struct blkpg_partition
)))
546 case BLKPG_ADD_PARTITION
:
548 /* Only master mtd device must be used to add partitions */
549 if (mtd_is_partition(mtd
))
552 return mtd_add_partition(mtd
, p
.devname
, p
.start
, p
.length
);
554 case BLKPG_DEL_PARTITION
:
559 return mtd_del_partition(mtd
, p
.pno
);
566 static int mtdchar_write_ioctl(struct mtd_info
*mtd
,
567 struct mtd_write_req __user
*argp
)
569 struct mtd_write_req req
;
570 struct mtd_oob_ops ops
;
571 void __user
*usr_data
, *usr_oob
;
574 if (copy_from_user(&req
, argp
, sizeof(req
)) ||
575 !access_ok(VERIFY_READ
, req
.usr_data
, req
.len
) ||
576 !access_ok(VERIFY_READ
, req
.usr_oob
, req
.ooblen
))
578 if (!mtd
->_write_oob
)
582 ops
.len
= (size_t)req
.len
;
583 ops
.ooblen
= (size_t)req
.ooblen
;
586 usr_data
= (void __user
*)(uintptr_t)req
.usr_data
;
587 usr_oob
= (void __user
*)(uintptr_t)req
.usr_oob
;
590 ops
.datbuf
= memdup_user(usr_data
, ops
.len
);
591 if (IS_ERR(ops
.datbuf
))
592 return PTR_ERR(ops
.datbuf
);
598 ops
.oobbuf
= memdup_user(usr_oob
, ops
.ooblen
);
599 if (IS_ERR(ops
.oobbuf
)) {
601 return PTR_ERR(ops
.oobbuf
);
607 ret
= mtd_write_oob(mtd
, (loff_t
)req
.start
, &ops
);
615 static int mtdchar_ioctl(struct file
*file
, u_int cmd
, u_long arg
)
617 struct mtd_file_info
*mfi
= file
->private_data
;
618 struct mtd_info
*mtd
= mfi
->mtd
;
619 void __user
*argp
= (void __user
*)arg
;
622 struct mtd_info_user info
;
624 pr_debug("MTD_ioctl\n");
626 size
= (cmd
& IOCSIZE_MASK
) >> IOCSIZE_SHIFT
;
628 if (!access_ok(VERIFY_READ
, argp
, size
))
632 if (!access_ok(VERIFY_WRITE
, argp
, size
))
637 case MEMGETREGIONCOUNT
:
638 if (copy_to_user(argp
, &(mtd
->numeraseregions
), sizeof(int)))
642 case MEMGETREGIONINFO
:
645 struct mtd_erase_region_info
*kr
;
646 struct region_info_user __user
*ur
= argp
;
648 if (get_user(ur_idx
, &(ur
->regionindex
)))
651 if (ur_idx
>= mtd
->numeraseregions
)
654 kr
= &(mtd
->eraseregions
[ur_idx
]);
656 if (put_user(kr
->offset
, &(ur
->offset
))
657 || put_user(kr
->erasesize
, &(ur
->erasesize
))
658 || put_user(kr
->numblocks
, &(ur
->numblocks
)))
665 memset(&info
, 0, sizeof(info
));
666 info
.type
= mtd
->type
;
667 info
.flags
= mtd
->flags
;
668 info
.size
= mtd
->size
;
669 info
.erasesize
= mtd
->erasesize
;
670 info
.writesize
= mtd
->writesize
;
671 info
.oobsize
= mtd
->oobsize
;
672 /* The below field is obsolete */
674 if (copy_to_user(argp
, &info
, sizeof(struct mtd_info_user
)))
681 struct erase_info
*erase
;
683 if(!(file
->f_mode
& FMODE_WRITE
))
686 erase
=kzalloc(sizeof(struct erase_info
),GFP_KERNEL
);
690 wait_queue_head_t waitq
;
691 DECLARE_WAITQUEUE(wait
, current
);
693 init_waitqueue_head(&waitq
);
695 if (cmd
== MEMERASE64
) {
696 struct erase_info_user64 einfo64
;
698 if (copy_from_user(&einfo64
, argp
,
699 sizeof(struct erase_info_user64
))) {
703 erase
->addr
= einfo64
.start
;
704 erase
->len
= einfo64
.length
;
706 struct erase_info_user einfo32
;
708 if (copy_from_user(&einfo32
, argp
,
709 sizeof(struct erase_info_user
))) {
713 erase
->addr
= einfo32
.start
;
714 erase
->len
= einfo32
.length
;
717 erase
->callback
= mtdchar_erase_callback
;
718 erase
->priv
= (unsigned long)&waitq
;
721 FIXME: Allow INTERRUPTIBLE. Which means
722 not having the wait_queue head on the stack.
724 If the wq_head is on the stack, and we
725 leave because we got interrupted, then the
726 wq_head is no longer there when the
727 callback routine tries to wake us up.
729 ret
= mtd_erase(mtd
, erase
);
731 set_current_state(TASK_UNINTERRUPTIBLE
);
732 add_wait_queue(&waitq
, &wait
);
733 if (erase
->state
!= MTD_ERASE_DONE
&&
734 erase
->state
!= MTD_ERASE_FAILED
)
736 remove_wait_queue(&waitq
, &wait
);
737 set_current_state(TASK_RUNNING
);
739 ret
= (erase
->state
== MTD_ERASE_FAILED
)?-EIO
:0;
748 struct mtd_oob_buf buf
;
749 struct mtd_oob_buf __user
*buf_user
= argp
;
751 /* NOTE: writes return length to buf_user->length */
752 if (copy_from_user(&buf
, argp
, sizeof(buf
)))
755 ret
= mtdchar_writeoob(file
, mtd
, buf
.start
, buf
.length
,
756 buf
.ptr
, &buf_user
->length
);
762 struct mtd_oob_buf buf
;
763 struct mtd_oob_buf __user
*buf_user
= argp
;
765 /* NOTE: writes return length to buf_user->start */
766 if (copy_from_user(&buf
, argp
, sizeof(buf
)))
769 ret
= mtdchar_readoob(file
, mtd
, buf
.start
, buf
.length
,
770 buf
.ptr
, &buf_user
->start
);
776 struct mtd_oob_buf64 buf
;
777 struct mtd_oob_buf64 __user
*buf_user
= argp
;
779 if (copy_from_user(&buf
, argp
, sizeof(buf
)))
782 ret
= mtdchar_writeoob(file
, mtd
, buf
.start
, buf
.length
,
783 (void __user
*)(uintptr_t)buf
.usr_ptr
,
790 struct mtd_oob_buf64 buf
;
791 struct mtd_oob_buf64 __user
*buf_user
= argp
;
793 if (copy_from_user(&buf
, argp
, sizeof(buf
)))
796 ret
= mtdchar_readoob(file
, mtd
, buf
.start
, buf
.length
,
797 (void __user
*)(uintptr_t)buf
.usr_ptr
,
804 ret
= mtdchar_write_ioctl(mtd
,
805 (struct mtd_write_req __user
*)arg
);
811 struct erase_info_user einfo
;
813 if (copy_from_user(&einfo
, argp
, sizeof(einfo
)))
816 ret
= mtd_lock(mtd
, einfo
.start
, einfo
.length
);
822 struct erase_info_user einfo
;
824 if (copy_from_user(&einfo
, argp
, sizeof(einfo
)))
827 ret
= mtd_unlock(mtd
, einfo
.start
, einfo
.length
);
833 struct erase_info_user einfo
;
835 if (copy_from_user(&einfo
, argp
, sizeof(einfo
)))
838 ret
= mtd_is_locked(mtd
, einfo
.start
, einfo
.length
);
842 /* Legacy interface */
845 struct nand_oobinfo oi
;
849 if (mtd
->ecclayout
->eccbytes
> ARRAY_SIZE(oi
.eccpos
))
852 oi
.useecc
= MTD_NANDECC_AUTOPLACE
;
853 memcpy(&oi
.eccpos
, mtd
->ecclayout
->eccpos
, sizeof(oi
.eccpos
));
854 memcpy(&oi
.oobfree
, mtd
->ecclayout
->oobfree
,
856 oi
.eccbytes
= mtd
->ecclayout
->eccbytes
;
858 if (copy_to_user(argp
, &oi
, sizeof(struct nand_oobinfo
)))
867 if (copy_from_user(&offs
, argp
, sizeof(loff_t
)))
869 return mtd_block_isbad(mtd
, offs
);
877 if (copy_from_user(&offs
, argp
, sizeof(loff_t
)))
879 return mtd_block_markbad(mtd
, offs
);
886 if (copy_from_user(&mode
, argp
, sizeof(int)))
889 mfi
->mode
= MTD_FILE_MODE_NORMAL
;
891 ret
= otp_select_filemode(mfi
, mode
);
897 case OTPGETREGIONCOUNT
:
898 case OTPGETREGIONINFO
:
900 struct otp_info
*buf
= kmalloc(4096, GFP_KERNEL
);
905 case MTD_FILE_MODE_OTP_FACTORY
:
906 ret
= mtd_get_fact_prot_info(mtd
, 4096, &retlen
, buf
);
908 case MTD_FILE_MODE_OTP_USER
:
909 ret
= mtd_get_user_prot_info(mtd
, 4096, &retlen
, buf
);
916 if (cmd
== OTPGETREGIONCOUNT
) {
917 int nbr
= retlen
/ sizeof(struct otp_info
);
918 ret
= copy_to_user(argp
, &nbr
, sizeof(int));
920 ret
= copy_to_user(argp
, buf
, retlen
);
930 struct otp_info oinfo
;
932 if (mfi
->mode
!= MTD_FILE_MODE_OTP_USER
)
934 if (copy_from_user(&oinfo
, argp
, sizeof(oinfo
)))
936 ret
= mtd_lock_user_prot_reg(mtd
, oinfo
.start
, oinfo
.length
);
940 /* This ioctl is being deprecated - it truncates the ECC layout */
943 struct nand_ecclayout_user
*usrlay
;
948 usrlay
= kmalloc(sizeof(*usrlay
), GFP_KERNEL
);
952 shrink_ecclayout(mtd
->ecclayout
, usrlay
);
954 if (copy_to_user(argp
, usrlay
, sizeof(*usrlay
)))
962 if (copy_to_user(argp
, &mtd
->ecc_stats
,
963 sizeof(struct mtd_ecc_stats
)))
973 case MTD_FILE_MODE_OTP_FACTORY
:
974 case MTD_FILE_MODE_OTP_USER
:
975 ret
= otp_select_filemode(mfi
, arg
);
978 case MTD_FILE_MODE_RAW
:
979 if (!mtd_has_oob(mtd
))
983 case MTD_FILE_MODE_NORMAL
:
994 ret
= mtdchar_blkpg_ioctl(mtd
,
995 (struct blkpg_ioctl_arg __user
*)arg
);
1001 /* No reread partition feature. Just return ok */
1011 } /* memory_ioctl */
1013 static long mtdchar_unlocked_ioctl(struct file
*file
, u_int cmd
, u_long arg
)
1017 mutex_lock(&mtd_mutex
);
1018 ret
= mtdchar_ioctl(file
, cmd
, arg
);
1019 mutex_unlock(&mtd_mutex
);
1024 #ifdef CONFIG_COMPAT
1026 struct mtd_oob_buf32
{
1029 compat_caddr_t ptr
; /* unsigned char* */
1032 #define MEMWRITEOOB32 _IOWR('M', 3, struct mtd_oob_buf32)
1033 #define MEMREADOOB32 _IOWR('M', 4, struct mtd_oob_buf32)
1035 static long mtdchar_compat_ioctl(struct file
*file
, unsigned int cmd
,
1038 struct mtd_file_info
*mfi
= file
->private_data
;
1039 struct mtd_info
*mtd
= mfi
->mtd
;
1040 void __user
*argp
= compat_ptr(arg
);
1043 mutex_lock(&mtd_mutex
);
1048 struct mtd_oob_buf32 buf
;
1049 struct mtd_oob_buf32 __user
*buf_user
= argp
;
1051 if (copy_from_user(&buf
, argp
, sizeof(buf
)))
1054 ret
= mtdchar_writeoob(file
, mtd
, buf
.start
,
1055 buf
.length
, compat_ptr(buf
.ptr
),
1062 struct mtd_oob_buf32 buf
;
1063 struct mtd_oob_buf32 __user
*buf_user
= argp
;
1065 /* NOTE: writes return length to buf->start */
1066 if (copy_from_user(&buf
, argp
, sizeof(buf
)))
1069 ret
= mtdchar_readoob(file
, mtd
, buf
.start
,
1070 buf
.length
, compat_ptr(buf
.ptr
),
1075 ret
= mtdchar_ioctl(file
, cmd
, (unsigned long)argp
);
1078 mutex_unlock(&mtd_mutex
);
1083 #endif /* CONFIG_COMPAT */
1086 * try to determine where a shared mapping can be made
1087 * - only supported for NOMMU at the moment (MMU can't doesn't copy private
1091 static unsigned long mtdchar_get_unmapped_area(struct file
*file
,
1094 unsigned long pgoff
,
1095 unsigned long flags
)
1097 struct mtd_file_info
*mfi
= file
->private_data
;
1098 struct mtd_info
*mtd
= mfi
->mtd
;
1099 unsigned long offset
;
1103 return (unsigned long) -EINVAL
;
1105 if (len
> mtd
->size
|| pgoff
>= (mtd
->size
>> PAGE_SHIFT
))
1106 return (unsigned long) -EINVAL
;
1108 offset
= pgoff
<< PAGE_SHIFT
;
1109 if (offset
> mtd
->size
- len
)
1110 return (unsigned long) -EINVAL
;
1112 ret
= mtd_get_unmapped_area(mtd
, len
, offset
, flags
);
1113 return ret
== -EOPNOTSUPP
? -ENODEV
: ret
;
1118 * set up a mapping for shared memory segments
1120 static int mtdchar_mmap(struct file
*file
, struct vm_area_struct
*vma
)
1123 struct mtd_file_info
*mfi
= file
->private_data
;
1124 struct mtd_info
*mtd
= mfi
->mtd
;
1125 struct map_info
*map
= mtd
->priv
;
1127 /* This is broken because it assumes the MTD device is map-based
1128 and that mtd->priv is a valid struct map_info. It should be
1129 replaced with something that uses the mtd_get_unmapped_area()
1130 operation properly. */
1131 if (0 /*mtd->type == MTD_RAM || mtd->type == MTD_ROM*/) {
1132 #ifdef pgprot_noncached
1133 if (file
->f_flags
& O_DSYNC
|| map
->phys
>= __pa(high_memory
))
1134 vma
->vm_page_prot
= pgprot_noncached(vma
->vm_page_prot
);
1136 return vm_iomap_memory(vma
, map
->phys
, map
->size
);
1140 return vma
->vm_flags
& VM_SHARED
? 0 : -EACCES
;
1144 static const struct file_operations mtd_fops
= {
1145 .owner
= THIS_MODULE
,
1146 .llseek
= mtdchar_lseek
,
1147 .read
= mtdchar_read
,
1148 .write
= mtdchar_write
,
1149 .unlocked_ioctl
= mtdchar_unlocked_ioctl
,
1150 #ifdef CONFIG_COMPAT
1151 .compat_ioctl
= mtdchar_compat_ioctl
,
1153 .open
= mtdchar_open
,
1154 .release
= mtdchar_close
,
1155 .mmap
= mtdchar_mmap
,
1157 .get_unmapped_area
= mtdchar_get_unmapped_area
,
1161 static const struct super_operations mtd_ops
= {
1162 .drop_inode
= generic_delete_inode
,
1163 .statfs
= simple_statfs
,
1166 static struct dentry
*mtd_inodefs_mount(struct file_system_type
*fs_type
,
1167 int flags
, const char *dev_name
, void *data
)
1169 return mount_pseudo(fs_type
, "mtd_inode:", &mtd_ops
, NULL
, MTD_INODE_FS_MAGIC
);
1172 static struct file_system_type mtd_inodefs_type
= {
1173 .name
= "mtd_inodefs",
1174 .mount
= mtd_inodefs_mount
,
1175 .kill_sb
= kill_anon_super
,
1177 MODULE_ALIAS_FS("mtd_inodefs");
1179 int __init
init_mtdchar(void)
1183 ret
= __register_chrdev(MTD_CHAR_MAJOR
, 0, 1 << MINORBITS
,
1186 pr_err("Can't allocate major number %d for MTD\n",
1191 ret
= register_filesystem(&mtd_inodefs_type
);
1193 pr_err("Can't register mtd_inodefs filesystem, error %d\n",
1195 goto err_unregister_chdev
;
1200 err_unregister_chdev
:
1201 __unregister_chrdev(MTD_CHAR_MAJOR
, 0, 1 << MINORBITS
, "mtd");
1205 void __exit
cleanup_mtdchar(void)
1207 unregister_filesystem(&mtd_inodefs_type
);
1208 __unregister_chrdev(MTD_CHAR_MAJOR
, 0, 1 << MINORBITS
, "mtd");
1211 MODULE_ALIAS_CHARDEV_MAJOR(MTD_CHAR_MAJOR
);