blob: f2f482bec5736b21a562da5e4fda11375e8cf457 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
David Woodhousea1452a32010-08-08 20:58:20 +01002 * Copyright © 1999-2010 David Woodhouse <dwmw2@infradead.org>
3 *
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.
8 *
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.
13 *
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
Linus Torvalds1da177e2005-04-16 15:20:36 -070017 *
18 */
19
Thomas Gleixner15fdc522005-11-07 00:14:42 +010020#include <linux/device.h>
21#include <linux/fs.h>
Andrew Morton0c1eafd2007-08-10 13:01:06 -070022#include <linux/mm.h>
Artem Bityutskiy9c740342006-10-11 14:52:47 +030023#include <linux/err.h>
Thomas Gleixner15fdc522005-11-07 00:14:42 +010024#include <linux/init.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070025#include <linux/kernel.h>
26#include <linux/module.h>
Thomas Gleixner15fdc522005-11-07 00:14:42 +010027#include <linux/slab.h>
28#include <linux/sched.h>
Arnd Bergmann5aa82942010-06-02 14:28:52 +020029#include <linux/mutex.h>
David Howells402d3262009-02-12 10:40:00 +000030#include <linux/backing-dev.h>
Kevin Cernekee97718542009-04-08 22:53:13 -070031#include <linux/compat.h>
Kirill A. Shutemovcd874232010-05-17 16:55:47 +030032#include <linux/mount.h>
Roman Tereshonkovd0f79592010-09-17 13:31:42 +030033#include <linux/blkpg.h>
Muthu Kumarb502bd12012-03-23 15:01:50 -070034#include <linux/magic.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070035#include <linux/mtd/mtd.h>
Roman Tereshonkovd0f79592010-09-17 13:31:42 +030036#include <linux/mtd/partitions.h>
Anatolij Gustschindd02b672010-06-15 09:30:15 +020037#include <linux/mtd/map.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070038
Thomas Gleixner15fdc522005-11-07 00:14:42 +010039#include <asm/uaccess.h>
Todd Poynor9bc7b382005-06-30 01:23:27 +010040
Arnd Bergmann5aa82942010-06-02 14:28:52 +020041static DEFINE_MUTEX(mtd_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -070042
Nicolas Pitre045e9a52005-02-08 19:12:53 +000043/*
Thomas Gleixnerf1a28c02006-05-30 00:37:34 +020044 * Data structure to hold the pointer to the mtd device as well
Brian Norris92394b5c2011-07-20 09:53:42 -070045 * as mode information of various use cases.
Nicolas Pitre045e9a52005-02-08 19:12:53 +000046 */
Thomas Gleixnerf1a28c02006-05-30 00:37:34 +020047struct mtd_file_info {
48 struct mtd_info *mtd;
Kirill A. Shutemovcd874232010-05-17 16:55:47 +030049 struct inode *ino;
Thomas Gleixnerf1a28c02006-05-30 00:37:34 +020050 enum mtd_file_modes mode;
51};
Nicolas Pitre31f42332005-02-08 17:45:55 +000052
Artem Bityutskiy969e57a2011-12-23 17:27:46 +020053static loff_t mtdchar_lseek(struct file *file, loff_t offset, int orig)
Linus Torvalds1da177e2005-04-16 15:20:36 -070054{
Thomas Gleixnerf1a28c02006-05-30 00:37:34 +020055 struct mtd_file_info *mfi = file->private_data;
56 struct mtd_info *mtd = mfi->mtd;
Linus Torvalds1da177e2005-04-16 15:20:36 -070057
58 switch (orig) {
Josef 'Jeff' Sipekea598302006-09-16 21:09:29 -040059 case SEEK_SET:
Linus Torvalds1da177e2005-04-16 15:20:36 -070060 break;
Josef 'Jeff' Sipekea598302006-09-16 21:09:29 -040061 case SEEK_CUR:
Todd Poynor8b491d72005-08-04 02:05:51 +010062 offset += file->f_pos;
Linus Torvalds1da177e2005-04-16 15:20:36 -070063 break;
Josef 'Jeff' Sipekea598302006-09-16 21:09:29 -040064 case SEEK_END:
Todd Poynor8b491d72005-08-04 02:05:51 +010065 offset += mtd->size;
Linus Torvalds1da177e2005-04-16 15:20:36 -070066 break;
67 default:
68 return -EINVAL;
69 }
70
Herbert Valerio Riedel1887f512006-06-24 00:03:36 +020071 if (offset >= 0 && offset <= mtd->size)
Todd Poynor8b491d72005-08-04 02:05:51 +010072 return file->f_pos = offset;
Linus Torvalds1da177e2005-04-16 15:20:36 -070073
Todd Poynor8b491d72005-08-04 02:05:51 +010074 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -070075}
76
Al Viro00292bb2012-03-23 13:47:52 -040077static int count;
78static struct vfsmount *mnt;
79static struct file_system_type mtd_inodefs_type;
Linus Torvalds1da177e2005-04-16 15:20:36 -070080
Artem Bityutskiy969e57a2011-12-23 17:27:46 +020081static int mtdchar_open(struct inode *inode, struct file *file)
Linus Torvalds1da177e2005-04-16 15:20:36 -070082{
83 int minor = iminor(inode);
84 int devnum = minor >> 1;
Jonathan Corbet60712392008-05-15 10:10:37 -060085 int ret = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -070086 struct mtd_info *mtd;
Thomas Gleixnerf1a28c02006-05-30 00:37:34 +020087 struct mtd_file_info *mfi;
Kirill A. Shutemovcd874232010-05-17 16:55:47 +030088 struct inode *mtd_ino;
Linus Torvalds1da177e2005-04-16 15:20:36 -070089
Brian Norris289c0522011-07-19 10:06:09 -070090 pr_debug("MTD_open\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -070091
Linus Torvalds1da177e2005-04-16 15:20:36 -070092 /* You can't open the RO devices RW */
Al Viroaeb5d722008-09-02 15:28:45 -040093 if ((file->f_mode & FMODE_WRITE) && (minor & 1))
Linus Torvalds1da177e2005-04-16 15:20:36 -070094 return -EACCES;
95
Al Viro00292bb2012-03-23 13:47:52 -040096 ret = simple_pin_fs(&mtd_inodefs_type, &mnt, &count);
97 if (ret)
98 return ret;
99
Arnd Bergmann5aa82942010-06-02 14:28:52 +0200100 mutex_lock(&mtd_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101 mtd = get_mtd_device(NULL, devnum);
Thomas Gleixner97894cd2005-11-07 11:15:26 +0000102
Jonathan Corbet60712392008-05-15 10:10:37 -0600103 if (IS_ERR(mtd)) {
104 ret = PTR_ERR(mtd);
105 goto out;
106 }
Thomas Gleixner97894cd2005-11-07 11:15:26 +0000107
David Howells402d3262009-02-12 10:40:00 +0000108 if (mtd->type == MTD_ABSENT) {
Jonathan Corbet60712392008-05-15 10:10:37 -0600109 ret = -ENODEV;
Al Viroc65390f2012-04-09 01:36:28 -0400110 goto out1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111 }
112
Al Viro00292bb2012-03-23 13:47:52 -0400113 mtd_ino = iget_locked(mnt->mnt_sb, devnum);
Kirill A. Shutemovcd874232010-05-17 16:55:47 +0300114 if (!mtd_ino) {
Kirill A. Shutemovcd874232010-05-17 16:55:47 +0300115 ret = -ENOMEM;
Al Viroc65390f2012-04-09 01:36:28 -0400116 goto out1;
Kirill A. Shutemovcd874232010-05-17 16:55:47 +0300117 }
118 if (mtd_ino->i_state & I_NEW) {
119 mtd_ino->i_private = mtd;
120 mtd_ino->i_mode = S_IFCHR;
121 mtd_ino->i_data.backing_dev_info = mtd->backing_dev_info;
122 unlock_new_inode(mtd_ino);
123 }
124 file->f_mapping = mtd_ino->i_mapping;
David Howells402d3262009-02-12 10:40:00 +0000125
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126 /* You can't open it RW if it's not a writeable device */
Al Viroaeb5d722008-09-02 15:28:45 -0400127 if ((file->f_mode & FMODE_WRITE) && !(mtd->flags & MTD_WRITEABLE)) {
Jonathan Corbet60712392008-05-15 10:10:37 -0600128 ret = -EACCES;
Al Viroc65390f2012-04-09 01:36:28 -0400129 goto out2;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130 }
Thomas Gleixner97894cd2005-11-07 11:15:26 +0000131
Thomas Gleixnerf1a28c02006-05-30 00:37:34 +0200132 mfi = kzalloc(sizeof(*mfi), GFP_KERNEL);
133 if (!mfi) {
Jonathan Corbet60712392008-05-15 10:10:37 -0600134 ret = -ENOMEM;
Al Viroc65390f2012-04-09 01:36:28 -0400135 goto out2;
Thomas Gleixnerf1a28c02006-05-30 00:37:34 +0200136 }
Kirill A. Shutemovcd874232010-05-17 16:55:47 +0300137 mfi->ino = mtd_ino;
Thomas Gleixnerf1a28c02006-05-30 00:37:34 +0200138 mfi->mtd = mtd;
139 file->private_data = mfi;
Al Viroc65390f2012-04-09 01:36:28 -0400140 mutex_unlock(&mtd_mutex);
141 return 0;
Thomas Gleixnerf1a28c02006-05-30 00:37:34 +0200142
Al Viroc65390f2012-04-09 01:36:28 -0400143out2:
144 iput(mtd_ino);
145out1:
146 put_mtd_device(mtd);
Jonathan Corbet60712392008-05-15 10:10:37 -0600147out:
Arnd Bergmann5aa82942010-06-02 14:28:52 +0200148 mutex_unlock(&mtd_mutex);
Al Viro00292bb2012-03-23 13:47:52 -0400149 simple_release_fs(&mnt, &count);
Jonathan Corbet60712392008-05-15 10:10:37 -0600150 return ret;
Artem Bityutskiy969e57a2011-12-23 17:27:46 +0200151} /* mtdchar_open */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152
153/*====================================================================*/
154
Artem Bityutskiy969e57a2011-12-23 17:27:46 +0200155static int mtdchar_close(struct inode *inode, struct file *file)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156{
Thomas Gleixnerf1a28c02006-05-30 00:37:34 +0200157 struct mtd_file_info *mfi = file->private_data;
158 struct mtd_info *mtd = mfi->mtd;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159
Brian Norris289c0522011-07-19 10:06:09 -0700160 pr_debug("MTD_close\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161
Joakim Tjernlund7eafaed2007-06-27 00:56:40 +0200162 /* Only sync if opened RW */
Artem Bityutskiy327cf292011-12-30 16:35:35 +0200163 if ((file->f_mode & FMODE_WRITE))
Artem Bityutskiy85f2f2a2011-12-23 19:03:12 +0200164 mtd_sync(mtd);
Thomas Gleixner97894cd2005-11-07 11:15:26 +0000165
Kirill A. Shutemovcd874232010-05-17 16:55:47 +0300166 iput(mfi->ino);
167
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168 put_mtd_device(mtd);
Thomas Gleixnerf1a28c02006-05-30 00:37:34 +0200169 file->private_data = NULL;
170 kfree(mfi);
Al Viro00292bb2012-03-23 13:47:52 -0400171 simple_release_fs(&mnt, &count);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172
173 return 0;
Artem Bityutskiy969e57a2011-12-23 17:27:46 +0200174} /* mtdchar_close */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175
Grant Erickson3e45cf52011-04-08 08:51:33 -0700176/* Back in June 2001, dwmw2 wrote:
177 *
178 * FIXME: This _really_ needs to die. In 2.5, we should lock the
179 * userspace buffer down and use it directly with readv/writev.
180 *
181 * The implementation below, using mtd_kmalloc_up_to, mitigates
182 * allocation failures when the system is under low-memory situations
183 * or if memory is highly fragmented at the cost of reducing the
184 * performance of the requested transfer due to a smaller buffer size.
185 *
186 * A more complex but more memory-efficient implementation based on
187 * get_user_pages and iovecs to cover extents of those pages is a
188 * longer-term goal, as intimated by dwmw2 above. However, for the
189 * write case, this requires yet more complex head and tail transfer
190 * handling when those head and tail offsets and sizes are such that
191 * alignment requirements are not met in the NAND subdriver.
192 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193
Artem Bityutskiy969e57a2011-12-23 17:27:46 +0200194static ssize_t mtdchar_read(struct file *file, char __user *buf, size_t count,
195 loff_t *ppos)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700196{
Thomas Gleixnerf1a28c02006-05-30 00:37:34 +0200197 struct mtd_file_info *mfi = file->private_data;
198 struct mtd_info *mtd = mfi->mtd;
Artem Bityutskiy30fa9842011-12-29 15:16:28 +0200199 size_t retlen;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200 size_t total_retlen=0;
201 int ret=0;
202 int len;
Grant Erickson3e45cf52011-04-08 08:51:33 -0700203 size_t size = count;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700204 char *kbuf;
Thomas Gleixner97894cd2005-11-07 11:15:26 +0000205
Brian Norris289c0522011-07-19 10:06:09 -0700206 pr_debug("MTD_read\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207
208 if (*ppos + count > mtd->size)
209 count = mtd->size - *ppos;
210
211 if (!count)
212 return 0;
Thomas Gleixner97894cd2005-11-07 11:15:26 +0000213
Grant Erickson3e45cf52011-04-08 08:51:33 -0700214 kbuf = mtd_kmalloc_up_to(mtd, &size);
Thago Galesib802c072006-04-17 17:38:15 +0100215 if (!kbuf)
216 return -ENOMEM;
217
Linus Torvalds1da177e2005-04-16 15:20:36 -0700218 while (count) {
Grant Erickson3e45cf52011-04-08 08:51:33 -0700219 len = min_t(size_t, count, size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700220
Thomas Gleixnerf1a28c02006-05-30 00:37:34 +0200221 switch (mfi->mode) {
Brian Norrisbeb133f2011-08-30 18:45:41 -0700222 case MTD_FILE_MODE_OTP_FACTORY:
Artem Bityutskiyd264f722011-12-23 18:40:06 +0200223 ret = mtd_read_fact_prot_reg(mtd, *ppos, len,
224 &retlen, kbuf);
Nicolas Pitre31f42332005-02-08 17:45:55 +0000225 break;
Brian Norrisbeb133f2011-08-30 18:45:41 -0700226 case MTD_FILE_MODE_OTP_USER:
Artem Bityutskiy4ea1cab2011-12-23 18:47:59 +0200227 ret = mtd_read_user_prot_reg(mtd, *ppos, len,
228 &retlen, kbuf);
Nicolas Pitre31f42332005-02-08 17:45:55 +0000229 break;
Brian Norrisbeb133f2011-08-30 18:45:41 -0700230 case MTD_FILE_MODE_RAW:
Thomas Gleixnerf1a28c02006-05-30 00:37:34 +0200231 {
232 struct mtd_oob_ops ops;
233
Brian Norris0612b9d2011-08-30 18:45:40 -0700234 ops.mode = MTD_OPS_RAW;
Thomas Gleixnerf1a28c02006-05-30 00:37:34 +0200235 ops.datbuf = kbuf;
236 ops.oobbuf = NULL;
237 ops.len = len;
238
Artem Bityutskiyfd2819b2011-12-23 18:27:05 +0200239 ret = mtd_read_oob(mtd, *ppos, &ops);
Thomas Gleixnerf1a28c02006-05-30 00:37:34 +0200240 retlen = ops.retlen;
241 break;
242 }
Nicolas Pitre31f42332005-02-08 17:45:55 +0000243 default:
Artem Bityutskiy329ad392011-12-23 17:30:16 +0200244 ret = mtd_read(mtd, *ppos, len, &retlen, kbuf);
Nicolas Pitre31f42332005-02-08 17:45:55 +0000245 }
Brian Norris7854d3f2011-06-23 14:12:08 -0700246 /* Nand returns -EBADMSG on ECC errors, but it returns
Linus Torvalds1da177e2005-04-16 15:20:36 -0700247 * the data. For our userspace tools it is important
Brian Norris7854d3f2011-06-23 14:12:08 -0700248 * to dump areas with ECC errors!
Thomas Gleixner9a1fcdf2006-05-29 14:56:39 +0200249 * For kernel internal usage it also might return -EUCLEAN
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300250 * to signal the caller that a bitflip has occurred and has
Thomas Gleixner9a1fcdf2006-05-29 14:56:39 +0200251 * been corrected by the ECC algorithm.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700252 * Userspace software which accesses NAND this way
253 * must be aware of the fact that it deals with NAND
254 */
Brian Norrisd57f40542011-09-20 18:34:25 -0700255 if (!ret || mtd_is_bitflip_or_eccerr(ret)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700256 *ppos += retlen;
257 if (copy_to_user(buf, kbuf, retlen)) {
Thomas Gleixnerf4a43cf2006-05-28 11:01:53 +0200258 kfree(kbuf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700259 return -EFAULT;
260 }
261 else
262 total_retlen += retlen;
263
264 count -= retlen;
265 buf += retlen;
Nicolas Pitre31f42332005-02-08 17:45:55 +0000266 if (retlen == 0)
267 count = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700268 }
269 else {
270 kfree(kbuf);
271 return ret;
272 }
Thomas Gleixner97894cd2005-11-07 11:15:26 +0000273
Linus Torvalds1da177e2005-04-16 15:20:36 -0700274 }
275
Thago Galesib802c072006-04-17 17:38:15 +0100276 kfree(kbuf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700277 return total_retlen;
Artem Bityutskiy969e57a2011-12-23 17:27:46 +0200278} /* mtdchar_read */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700279
Artem Bityutskiy969e57a2011-12-23 17:27:46 +0200280static ssize_t mtdchar_write(struct file *file, const char __user *buf, size_t count,
281 loff_t *ppos)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700282{
Thomas Gleixnerf1a28c02006-05-30 00:37:34 +0200283 struct mtd_file_info *mfi = file->private_data;
284 struct mtd_info *mtd = mfi->mtd;
Grant Erickson3e45cf52011-04-08 08:51:33 -0700285 size_t size = count;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700286 char *kbuf;
287 size_t retlen;
288 size_t total_retlen=0;
289 int ret=0;
290 int len;
291
Brian Norris289c0522011-07-19 10:06:09 -0700292 pr_debug("MTD_write\n");
Thomas Gleixner97894cd2005-11-07 11:15:26 +0000293
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294 if (*ppos == mtd->size)
295 return -ENOSPC;
Thomas Gleixner97894cd2005-11-07 11:15:26 +0000296
Linus Torvalds1da177e2005-04-16 15:20:36 -0700297 if (*ppos + count > mtd->size)
298 count = mtd->size - *ppos;
299
300 if (!count)
301 return 0;
302
Grant Erickson3e45cf52011-04-08 08:51:33 -0700303 kbuf = mtd_kmalloc_up_to(mtd, &size);
Thago Galesib802c072006-04-17 17:38:15 +0100304 if (!kbuf)
305 return -ENOMEM;
306
Linus Torvalds1da177e2005-04-16 15:20:36 -0700307 while (count) {
Grant Erickson3e45cf52011-04-08 08:51:33 -0700308 len = min_t(size_t, count, size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700309
Linus Torvalds1da177e2005-04-16 15:20:36 -0700310 if (copy_from_user(kbuf, buf, len)) {
311 kfree(kbuf);
312 return -EFAULT;
313 }
Thomas Gleixner97894cd2005-11-07 11:15:26 +0000314
Thomas Gleixnerf1a28c02006-05-30 00:37:34 +0200315 switch (mfi->mode) {
Brian Norrisbeb133f2011-08-30 18:45:41 -0700316 case MTD_FILE_MODE_OTP_FACTORY:
Nicolas Pitre31f42332005-02-08 17:45:55 +0000317 ret = -EROFS;
318 break;
Brian Norrisbeb133f2011-08-30 18:45:41 -0700319 case MTD_FILE_MODE_OTP_USER:
Artem Bityutskiy482b43a2011-12-23 18:50:04 +0200320 ret = mtd_write_user_prot_reg(mtd, *ppos, len,
321 &retlen, kbuf);
Nicolas Pitre31f42332005-02-08 17:45:55 +0000322 break;
Thomas Gleixnerf1a28c02006-05-30 00:37:34 +0200323
Brian Norrisbeb133f2011-08-30 18:45:41 -0700324 case MTD_FILE_MODE_RAW:
Thomas Gleixnerf1a28c02006-05-30 00:37:34 +0200325 {
326 struct mtd_oob_ops ops;
327
Brian Norris0612b9d2011-08-30 18:45:40 -0700328 ops.mode = MTD_OPS_RAW;
Thomas Gleixnerf1a28c02006-05-30 00:37:34 +0200329 ops.datbuf = kbuf;
330 ops.oobbuf = NULL;
Peter Wippichbf514082011-06-06 15:50:58 +0200331 ops.ooboffs = 0;
Thomas Gleixnerf1a28c02006-05-30 00:37:34 +0200332 ops.len = len;
333
Artem Bityutskiya2cc5ba2011-12-23 18:29:55 +0200334 ret = mtd_write_oob(mtd, *ppos, &ops);
Thomas Gleixnerf1a28c02006-05-30 00:37:34 +0200335 retlen = ops.retlen;
336 break;
337 }
338
Nicolas Pitre31f42332005-02-08 17:45:55 +0000339 default:
Artem Bityutskiyeda95cb2011-12-23 17:35:41 +0200340 ret = mtd_write(mtd, *ppos, len, &retlen, kbuf);
Nicolas Pitre31f42332005-02-08 17:45:55 +0000341 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700342 if (!ret) {
343 *ppos += retlen;
344 total_retlen += retlen;
345 count -= retlen;
346 buf += retlen;
347 }
348 else {
349 kfree(kbuf);
350 return ret;
351 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700352 }
353
Thago Galesib802c072006-04-17 17:38:15 +0100354 kfree(kbuf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700355 return total_retlen;
Artem Bityutskiy969e57a2011-12-23 17:27:46 +0200356} /* mtdchar_write */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700357
358/*======================================================================
359
360 IOCTL calls for getting device parameters.
361
362======================================================================*/
363static void mtdchar_erase_callback (struct erase_info *instr)
364{
365 wake_up((wait_queue_head_t *)instr->priv);
366}
367
David Brownell34a82442008-07-30 12:35:05 -0700368#ifdef CONFIG_HAVE_MTD_OTP
Thomas Gleixnerf1a28c02006-05-30 00:37:34 +0200369static int otp_select_filemode(struct mtd_file_info *mfi, int mode)
370{
371 struct mtd_info *mtd = mfi->mtd;
Artem Bityutskiyb6de3d62011-12-29 10:06:32 +0200372 size_t retlen;
Thomas Gleixnerf1a28c02006-05-30 00:37:34 +0200373 int ret = 0;
374
Artem Bityutskiyb6de3d62011-12-29 10:06:32 +0200375 /*
376 * Make a fake call to mtd_read_fact_prot_reg() to check if OTP
377 * operations are supported.
378 */
Will Newton7a844772012-03-30 11:51:02 +0100379 if (mtd_read_fact_prot_reg(mtd, -1, 0, &retlen, NULL) == -EOPNOTSUPP)
Artem Bityutskiyb6de3d62011-12-29 10:06:32 +0200380 return -EOPNOTSUPP;
381
Thomas Gleixnerf1a28c02006-05-30 00:37:34 +0200382 switch (mode) {
383 case MTD_OTP_FACTORY:
Artem Bityutskiyb6de3d62011-12-29 10:06:32 +0200384 mfi->mode = MTD_FILE_MODE_OTP_FACTORY;
Thomas Gleixnerf1a28c02006-05-30 00:37:34 +0200385 break;
386 case MTD_OTP_USER:
Artem Bityutskiyb6de3d62011-12-29 10:06:32 +0200387 mfi->mode = MTD_FILE_MODE_OTP_USER;
Thomas Gleixnerf1a28c02006-05-30 00:37:34 +0200388 break;
389 default:
390 ret = -EINVAL;
391 case MTD_OTP_OFF:
392 break;
393 }
394 return ret;
395}
396#else
397# define otp_select_filemode(f,m) -EOPNOTSUPP
398#endif
399
Artem Bityutskiy969e57a2011-12-23 17:27:46 +0200400static int mtdchar_writeoob(struct file *file, struct mtd_info *mtd,
Kevin Cernekee97718542009-04-08 22:53:13 -0700401 uint64_t start, uint32_t length, void __user *ptr,
402 uint32_t __user *retp)
403{
Brian Norris9ce244b2011-08-30 18:45:37 -0700404 struct mtd_file_info *mfi = file->private_data;
Kevin Cernekee97718542009-04-08 22:53:13 -0700405 struct mtd_oob_ops ops;
406 uint32_t retlen;
407 int ret = 0;
408
409 if (!(file->f_mode & FMODE_WRITE))
410 return -EPERM;
411
412 if (length > 4096)
413 return -EINVAL;
414
Artem Bityutskiy3c3c10b2012-01-30 14:58:32 +0200415 if (!mtd->_write_oob)
Kevin Cernekee97718542009-04-08 22:53:13 -0700416 ret = -EOPNOTSUPP;
417 else
Roel Kluin00404762010-01-29 10:35:04 +0100418 ret = access_ok(VERIFY_READ, ptr, length) ? 0 : -EFAULT;
Kevin Cernekee97718542009-04-08 22:53:13 -0700419
420 if (ret)
421 return ret;
422
423 ops.ooblen = length;
Brian Norris305b93f2011-08-23 17:17:32 -0700424 ops.ooboffs = start & (mtd->writesize - 1);
Kevin Cernekee97718542009-04-08 22:53:13 -0700425 ops.datbuf = NULL;
Brian Norrisbeb133f2011-08-30 18:45:41 -0700426 ops.mode = (mfi->mode == MTD_FILE_MODE_RAW) ? MTD_OPS_RAW :
Brian Norris0612b9d2011-08-30 18:45:40 -0700427 MTD_OPS_PLACE_OOB;
Kevin Cernekee97718542009-04-08 22:53:13 -0700428
429 if (ops.ooboffs && ops.ooblen > (mtd->oobsize - ops.ooboffs))
430 return -EINVAL;
431
Julia Lawalldf1f1d12010-05-22 10:22:49 +0200432 ops.oobbuf = memdup_user(ptr, length);
433 if (IS_ERR(ops.oobbuf))
434 return PTR_ERR(ops.oobbuf);
Kevin Cernekee97718542009-04-08 22:53:13 -0700435
Brian Norris305b93f2011-08-23 17:17:32 -0700436 start &= ~((uint64_t)mtd->writesize - 1);
Artem Bityutskiya2cc5ba2011-12-23 18:29:55 +0200437 ret = mtd_write_oob(mtd, start, &ops);
Kevin Cernekee97718542009-04-08 22:53:13 -0700438
439 if (ops.oobretlen > 0xFFFFFFFFU)
440 ret = -EOVERFLOW;
441 retlen = ops.oobretlen;
442 if (copy_to_user(retp, &retlen, sizeof(length)))
443 ret = -EFAULT;
444
445 kfree(ops.oobbuf);
446 return ret;
447}
448
Artem Bityutskiy969e57a2011-12-23 17:27:46 +0200449static int mtdchar_readoob(struct file *file, struct mtd_info *mtd,
Brian Norrisc46f6482011-08-30 18:45:38 -0700450 uint64_t start, uint32_t length, void __user *ptr,
451 uint32_t __user *retp)
Kevin Cernekee97718542009-04-08 22:53:13 -0700452{
Brian Norrisc46f6482011-08-30 18:45:38 -0700453 struct mtd_file_info *mfi = file->private_data;
Kevin Cernekee97718542009-04-08 22:53:13 -0700454 struct mtd_oob_ops ops;
455 int ret = 0;
456
457 if (length > 4096)
458 return -EINVAL;
459
Artem Bityutskiydac26392011-12-28 17:50:34 +0200460 if (!access_ok(VERIFY_WRITE, ptr, length))
461 return -EFAULT;
Kevin Cernekee97718542009-04-08 22:53:13 -0700462
463 ops.ooblen = length;
Brian Norris305b93f2011-08-23 17:17:32 -0700464 ops.ooboffs = start & (mtd->writesize - 1);
Kevin Cernekee97718542009-04-08 22:53:13 -0700465 ops.datbuf = NULL;
Brian Norrisbeb133f2011-08-30 18:45:41 -0700466 ops.mode = (mfi->mode == MTD_FILE_MODE_RAW) ? MTD_OPS_RAW :
Brian Norris0612b9d2011-08-30 18:45:40 -0700467 MTD_OPS_PLACE_OOB;
Kevin Cernekee97718542009-04-08 22:53:13 -0700468
469 if (ops.ooboffs && ops.ooblen > (mtd->oobsize - ops.ooboffs))
470 return -EINVAL;
471
472 ops.oobbuf = kmalloc(length, GFP_KERNEL);
473 if (!ops.oobbuf)
474 return -ENOMEM;
475
Brian Norris305b93f2011-08-23 17:17:32 -0700476 start &= ~((uint64_t)mtd->writesize - 1);
Artem Bityutskiyfd2819b2011-12-23 18:27:05 +0200477 ret = mtd_read_oob(mtd, start, &ops);
Kevin Cernekee97718542009-04-08 22:53:13 -0700478
479 if (put_user(ops.oobretlen, retp))
480 ret = -EFAULT;
481 else if (ops.oobretlen && copy_to_user(ptr, ops.oobbuf,
482 ops.oobretlen))
483 ret = -EFAULT;
484
485 kfree(ops.oobbuf);
Brian Norris041e4572011-06-23 16:45:24 -0700486
487 /*
488 * NAND returns -EBADMSG on ECC errors, but it returns the OOB
489 * data. For our userspace tools it is important to dump areas
490 * with ECC errors!
491 * For kernel internal usage it also might return -EUCLEAN
492 * to signal the caller that a bitflip has occured and has
493 * been corrected by the ECC algorithm.
494 *
Brian Norrisc478d7e2011-06-28 16:29:00 -0700495 * Note: currently the standard NAND function, nand_read_oob_std,
496 * does not calculate ECC for the OOB area, so do not rely on
497 * this behavior unless you have replaced it with your own.
Brian Norris041e4572011-06-23 16:45:24 -0700498 */
Brian Norrisd57f40542011-09-20 18:34:25 -0700499 if (mtd_is_bitflip_or_eccerr(ret))
Brian Norris041e4572011-06-23 16:45:24 -0700500 return 0;
501
Kevin Cernekee97718542009-04-08 22:53:13 -0700502 return ret;
503}
504
Brian Norriscc26c3c2010-08-24 18:12:00 -0700505/*
506 * Copies (and truncates, if necessary) data from the larger struct,
507 * nand_ecclayout, to the smaller, deprecated layout struct,
Brian Norris92394b5c2011-07-20 09:53:42 -0700508 * nand_ecclayout_user. This is necessary only to support the deprecated
Brian Norriscc26c3c2010-08-24 18:12:00 -0700509 * API ioctl ECCGETLAYOUT while allowing all new functionality to use
510 * nand_ecclayout flexibly (i.e. the struct may change size in new
511 * releases without requiring major rewrites).
512 */
513static int shrink_ecclayout(const struct nand_ecclayout *from,
514 struct nand_ecclayout_user *to)
515{
516 int i;
517
518 if (!from || !to)
519 return -EINVAL;
520
521 memset(to, 0, sizeof(*to));
522
Brian Norris0ceacf32010-09-19 23:57:12 -0700523 to->eccbytes = min((int)from->eccbytes, MTD_MAX_ECCPOS_ENTRIES);
Brian Norriscc26c3c2010-08-24 18:12:00 -0700524 for (i = 0; i < to->eccbytes; i++)
525 to->eccpos[i] = from->eccpos[i];
526
527 for (i = 0; i < MTD_MAX_OOBFREE_ENTRIES; i++) {
528 if (from->oobfree[i].length == 0 &&
529 from->oobfree[i].offset == 0)
530 break;
531 to->oobavail += from->oobfree[i].length;
532 to->oobfree[i] = from->oobfree[i];
533 }
534
535 return 0;
536}
537
Artem Bityutskiy969e57a2011-12-23 17:27:46 +0200538static int mtdchar_blkpg_ioctl(struct mtd_info *mtd,
Roman Tereshonkovd0f79592010-09-17 13:31:42 +0300539 struct blkpg_ioctl_arg __user *arg)
540{
541 struct blkpg_ioctl_arg a;
542 struct blkpg_partition p;
543
544 if (!capable(CAP_SYS_ADMIN))
545 return -EPERM;
546
Roman Tereshonkovd0f79592010-09-17 13:31:42 +0300547 if (copy_from_user(&a, arg, sizeof(struct blkpg_ioctl_arg)))
548 return -EFAULT;
549
550 if (copy_from_user(&p, a.data, sizeof(struct blkpg_partition)))
551 return -EFAULT;
552
553 switch (a.op) {
554 case BLKPG_ADD_PARTITION:
555
Roman Tereshonkova7e93dc2010-11-23 14:17:17 +0200556 /* Only master mtd device must be used to add partitions */
557 if (mtd_is_partition(mtd))
558 return -EINVAL;
559
Roman Tereshonkovd0f79592010-09-17 13:31:42 +0300560 return mtd_add_partition(mtd, p.devname, p.start, p.length);
561
562 case BLKPG_DEL_PARTITION:
563
564 if (p.pno < 0)
565 return -EINVAL;
566
567 return mtd_del_partition(mtd, p.pno);
568
569 default:
570 return -EINVAL;
571 }
572}
Roman Tereshonkovd0f79592010-09-17 13:31:42 +0300573
Artem Bityutskiy969e57a2011-12-23 17:27:46 +0200574static int mtdchar_write_ioctl(struct mtd_info *mtd,
Brian Norrise99d8b02011-09-09 09:59:03 -0700575 struct mtd_write_req __user *argp)
576{
577 struct mtd_write_req req;
578 struct mtd_oob_ops ops;
579 void __user *usr_data, *usr_oob;
580 int ret;
581
582 if (copy_from_user(&req, argp, sizeof(req)) ||
583 !access_ok(VERIFY_READ, req.usr_data, req.len) ||
584 !access_ok(VERIFY_READ, req.usr_oob, req.ooblen))
585 return -EFAULT;
Artem Bityutskiy3c3c10b2012-01-30 14:58:32 +0200586 if (!mtd->_write_oob)
Brian Norrise99d8b02011-09-09 09:59:03 -0700587 return -EOPNOTSUPP;
588
589 ops.mode = req.mode;
590 ops.len = (size_t)req.len;
591 ops.ooblen = (size_t)req.ooblen;
592 ops.ooboffs = 0;
593
594 usr_data = (void __user *)(uintptr_t)req.usr_data;
595 usr_oob = (void __user *)(uintptr_t)req.usr_oob;
596
597 if (req.usr_data) {
598 ops.datbuf = memdup_user(usr_data, ops.len);
599 if (IS_ERR(ops.datbuf))
600 return PTR_ERR(ops.datbuf);
601 } else {
602 ops.datbuf = NULL;
603 }
604
605 if (req.usr_oob) {
606 ops.oobbuf = memdup_user(usr_oob, ops.ooblen);
607 if (IS_ERR(ops.oobbuf)) {
608 kfree(ops.datbuf);
609 return PTR_ERR(ops.oobbuf);
610 }
611 } else {
612 ops.oobbuf = NULL;
613 }
614
Artem Bityutskiya2cc5ba2011-12-23 18:29:55 +0200615 ret = mtd_write_oob(mtd, (loff_t)req.start, &ops);
Brian Norrise99d8b02011-09-09 09:59:03 -0700616
617 kfree(ops.datbuf);
618 kfree(ops.oobbuf);
619
620 return ret;
621}
622
Artem Bityutskiy969e57a2011-12-23 17:27:46 +0200623static int mtdchar_ioctl(struct file *file, u_int cmd, u_long arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700624{
Thomas Gleixnerf1a28c02006-05-30 00:37:34 +0200625 struct mtd_file_info *mfi = file->private_data;
626 struct mtd_info *mtd = mfi->mtd;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700627 void __user *argp = (void __user *)arg;
628 int ret = 0;
629 u_long size;
Joern Engel73c619e2006-05-30 14:25:35 +0200630 struct mtd_info_user info;
Thomas Gleixner97894cd2005-11-07 11:15:26 +0000631
Brian Norris289c0522011-07-19 10:06:09 -0700632 pr_debug("MTD_ioctl\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700633
634 size = (cmd & IOCSIZE_MASK) >> IOCSIZE_SHIFT;
635 if (cmd & IOC_IN) {
636 if (!access_ok(VERIFY_READ, argp, size))
637 return -EFAULT;
638 }
639 if (cmd & IOC_OUT) {
640 if (!access_ok(VERIFY_WRITE, argp, size))
641 return -EFAULT;
642 }
Thomas Gleixner97894cd2005-11-07 11:15:26 +0000643
Linus Torvalds1da177e2005-04-16 15:20:36 -0700644 switch (cmd) {
645 case MEMGETREGIONCOUNT:
646 if (copy_to_user(argp, &(mtd->numeraseregions), sizeof(int)))
647 return -EFAULT;
648 break;
649
650 case MEMGETREGIONINFO:
651 {
Zev Weissb67c5f82008-09-01 05:02:12 -0700652 uint32_t ur_idx;
653 struct mtd_erase_region_info *kr;
H Hartley Sweetenbcc98a42010-01-15 11:25:38 -0700654 struct region_info_user __user *ur = argp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700655
Zev Weissb67c5f82008-09-01 05:02:12 -0700656 if (get_user(ur_idx, &(ur->regionindex)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700657 return -EFAULT;
658
Dan Carpenter5e59be12010-09-08 21:39:56 +0200659 if (ur_idx >= mtd->numeraseregions)
660 return -EINVAL;
661
Zev Weissb67c5f82008-09-01 05:02:12 -0700662 kr = &(mtd->eraseregions[ur_idx]);
663
664 if (put_user(kr->offset, &(ur->offset))
665 || put_user(kr->erasesize, &(ur->erasesize))
666 || put_user(kr->numblocks, &(ur->numblocks)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700667 return -EFAULT;
Zev Weissb67c5f82008-09-01 05:02:12 -0700668
Linus Torvalds1da177e2005-04-16 15:20:36 -0700669 break;
670 }
671
672 case MEMGETINFO:
Vasiliy Kulikova0c5a392010-11-06 17:41:24 +0300673 memset(&info, 0, sizeof(info));
Joern Engel73c619e2006-05-30 14:25:35 +0200674 info.type = mtd->type;
675 info.flags = mtd->flags;
676 info.size = mtd->size;
677 info.erasesize = mtd->erasesize;
678 info.writesize = mtd->writesize;
679 info.oobsize = mtd->oobsize;
Brian Norris19fb4342011-08-30 18:45:46 -0700680 /* The below field is obsolete */
681 info.padding = 0;
Joern Engel73c619e2006-05-30 14:25:35 +0200682 if (copy_to_user(argp, &info, sizeof(struct mtd_info_user)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700683 return -EFAULT;
684 break;
685
686 case MEMERASE:
Kevin Cernekee0dc54e92009-04-08 22:52:28 -0700687 case MEMERASE64:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700688 {
689 struct erase_info *erase;
690
Al Viroaeb5d722008-09-02 15:28:45 -0400691 if(!(file->f_mode & FMODE_WRITE))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700692 return -EPERM;
693
Burman Yan95b93a02006-11-15 21:10:29 +0200694 erase=kzalloc(sizeof(struct erase_info),GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700695 if (!erase)
696 ret = -ENOMEM;
697 else {
698 wait_queue_head_t waitq;
699 DECLARE_WAITQUEUE(wait, current);
700
701 init_waitqueue_head(&waitq);
702
Kevin Cernekee0dc54e92009-04-08 22:52:28 -0700703 if (cmd == MEMERASE64) {
704 struct erase_info_user64 einfo64;
705
706 if (copy_from_user(&einfo64, argp,
707 sizeof(struct erase_info_user64))) {
708 kfree(erase);
709 return -EFAULT;
710 }
711 erase->addr = einfo64.start;
712 erase->len = einfo64.length;
713 } else {
714 struct erase_info_user einfo32;
715
716 if (copy_from_user(&einfo32, argp,
717 sizeof(struct erase_info_user))) {
718 kfree(erase);
719 return -EFAULT;
720 }
721 erase->addr = einfo32.start;
722 erase->len = einfo32.length;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700723 }
724 erase->mtd = mtd;
725 erase->callback = mtdchar_erase_callback;
726 erase->priv = (unsigned long)&waitq;
Thomas Gleixner97894cd2005-11-07 11:15:26 +0000727
Linus Torvalds1da177e2005-04-16 15:20:36 -0700728 /*
729 FIXME: Allow INTERRUPTIBLE. Which means
730 not having the wait_queue head on the stack.
Thomas Gleixner97894cd2005-11-07 11:15:26 +0000731
Linus Torvalds1da177e2005-04-16 15:20:36 -0700732 If the wq_head is on the stack, and we
733 leave because we got interrupted, then the
734 wq_head is no longer there when the
735 callback routine tries to wake us up.
736 */
Artem Bityutskiy7e1f0dc2011-12-23 15:25:39 +0200737 ret = mtd_erase(mtd, erase);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700738 if (!ret) {
739 set_current_state(TASK_UNINTERRUPTIBLE);
740 add_wait_queue(&waitq, &wait);
741 if (erase->state != MTD_ERASE_DONE &&
742 erase->state != MTD_ERASE_FAILED)
743 schedule();
744 remove_wait_queue(&waitq, &wait);
745 set_current_state(TASK_RUNNING);
746
747 ret = (erase->state == MTD_ERASE_FAILED)?-EIO:0;
748 }
749 kfree(erase);
750 }
751 break;
752 }
753
754 case MEMWRITEOOB:
755 {
756 struct mtd_oob_buf buf;
Kevin Cernekee97718542009-04-08 22:53:13 -0700757 struct mtd_oob_buf __user *buf_user = argp;
Thomas Gleixner97894cd2005-11-07 11:15:26 +0000758
Kevin Cernekee97718542009-04-08 22:53:13 -0700759 /* NOTE: writes return length to buf_user->length */
760 if (copy_from_user(&buf, argp, sizeof(buf)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700761 ret = -EFAULT;
Kevin Cernekee97718542009-04-08 22:53:13 -0700762 else
Artem Bityutskiy969e57a2011-12-23 17:27:46 +0200763 ret = mtdchar_writeoob(file, mtd, buf.start, buf.length,
Kevin Cernekee97718542009-04-08 22:53:13 -0700764 buf.ptr, &buf_user->length);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700765 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700766 }
767
768 case MEMREADOOB:
769 {
770 struct mtd_oob_buf buf;
Kevin Cernekee97718542009-04-08 22:53:13 -0700771 struct mtd_oob_buf __user *buf_user = argp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700772
Kevin Cernekee97718542009-04-08 22:53:13 -0700773 /* NOTE: writes return length to buf_user->start */
774 if (copy_from_user(&buf, argp, sizeof(buf)))
775 ret = -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700776 else
Artem Bityutskiy969e57a2011-12-23 17:27:46 +0200777 ret = mtdchar_readoob(file, mtd, buf.start, buf.length,
Kevin Cernekee97718542009-04-08 22:53:13 -0700778 buf.ptr, &buf_user->start);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700779 break;
780 }
781
Kevin Cernekeeaea7cea2009-04-08 22:53:49 -0700782 case MEMWRITEOOB64:
783 {
784 struct mtd_oob_buf64 buf;
785 struct mtd_oob_buf64 __user *buf_user = argp;
786
787 if (copy_from_user(&buf, argp, sizeof(buf)))
788 ret = -EFAULT;
789 else
Artem Bityutskiy969e57a2011-12-23 17:27:46 +0200790 ret = mtdchar_writeoob(file, mtd, buf.start, buf.length,
Kevin Cernekeeaea7cea2009-04-08 22:53:49 -0700791 (void __user *)(uintptr_t)buf.usr_ptr,
792 &buf_user->length);
793 break;
794 }
795
796 case MEMREADOOB64:
797 {
798 struct mtd_oob_buf64 buf;
799 struct mtd_oob_buf64 __user *buf_user = argp;
800
801 if (copy_from_user(&buf, argp, sizeof(buf)))
802 ret = -EFAULT;
803 else
Artem Bityutskiy969e57a2011-12-23 17:27:46 +0200804 ret = mtdchar_readoob(file, mtd, buf.start, buf.length,
Kevin Cernekeeaea7cea2009-04-08 22:53:49 -0700805 (void __user *)(uintptr_t)buf.usr_ptr,
806 &buf_user->length);
807 break;
808 }
809
Brian Norrise99d8b02011-09-09 09:59:03 -0700810 case MEMWRITE:
811 {
Artem Bityutskiy969e57a2011-12-23 17:27:46 +0200812 ret = mtdchar_write_ioctl(mtd,
Brian Norrise99d8b02011-09-09 09:59:03 -0700813 (struct mtd_write_req __user *)arg);
814 break;
815 }
816
Linus Torvalds1da177e2005-04-16 15:20:36 -0700817 case MEMLOCK:
818 {
Harvey Harrison175428b2008-07-03 23:40:14 -0700819 struct erase_info_user einfo;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700820
Harvey Harrison175428b2008-07-03 23:40:14 -0700821 if (copy_from_user(&einfo, argp, sizeof(einfo)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700822 return -EFAULT;
823
Artem Bityutskiy38134562011-12-30 17:00:35 +0200824 ret = mtd_lock(mtd, einfo.start, einfo.length);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700825 break;
826 }
827
828 case MEMUNLOCK:
829 {
Harvey Harrison175428b2008-07-03 23:40:14 -0700830 struct erase_info_user einfo;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700831
Harvey Harrison175428b2008-07-03 23:40:14 -0700832 if (copy_from_user(&einfo, argp, sizeof(einfo)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700833 return -EFAULT;
834
Artem Bityutskiy38134562011-12-30 17:00:35 +0200835 ret = mtd_unlock(mtd, einfo.start, einfo.length);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700836 break;
837 }
838
Richard Cochran99384242010-06-14 18:10:33 +0200839 case MEMISLOCKED:
840 {
841 struct erase_info_user einfo;
842
843 if (copy_from_user(&einfo, argp, sizeof(einfo)))
844 return -EFAULT;
845
Artem Bityutskiy38134562011-12-30 17:00:35 +0200846 ret = mtd_is_locked(mtd, einfo.start, einfo.length);
Richard Cochran99384242010-06-14 18:10:33 +0200847 break;
848 }
849
Thomas Gleixner5bd34c02006-05-27 22:16:10 +0200850 /* Legacy interface */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700851 case MEMGETOOBSEL:
852 {
Thomas Gleixner5bd34c02006-05-27 22:16:10 +0200853 struct nand_oobinfo oi;
854
855 if (!mtd->ecclayout)
856 return -EOPNOTSUPP;
857 if (mtd->ecclayout->eccbytes > ARRAY_SIZE(oi.eccpos))
858 return -EINVAL;
859
860 oi.useecc = MTD_NANDECC_AUTOPLACE;
861 memcpy(&oi.eccpos, mtd->ecclayout->eccpos, sizeof(oi.eccpos));
862 memcpy(&oi.oobfree, mtd->ecclayout->oobfree,
863 sizeof(oi.oobfree));
Ricard Wanderlöfd25ade72006-10-17 17:27:11 +0200864 oi.eccbytes = mtd->ecclayout->eccbytes;
Thomas Gleixner5bd34c02006-05-27 22:16:10 +0200865
866 if (copy_to_user(argp, &oi, sizeof(struct nand_oobinfo)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700867 return -EFAULT;
868 break;
869 }
870
871 case MEMGETBADBLOCK:
872 {
873 loff_t offs;
Thomas Gleixner97894cd2005-11-07 11:15:26 +0000874
Linus Torvalds1da177e2005-04-16 15:20:36 -0700875 if (copy_from_user(&offs, argp, sizeof(loff_t)))
876 return -EFAULT;
Artem Bityutskiy8f461a72012-01-02 13:48:54 +0200877 return mtd_block_isbad(mtd, offs);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700878 break;
879 }
880
881 case MEMSETBADBLOCK:
882 {
883 loff_t offs;
884
885 if (copy_from_user(&offs, argp, sizeof(loff_t)))
886 return -EFAULT;
Artem Bityutskiy800ffd32012-01-02 13:59:12 +0200887 return mtd_block_markbad(mtd, offs);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700888 break;
889 }
890
David Brownell34a82442008-07-30 12:35:05 -0700891#ifdef CONFIG_HAVE_MTD_OTP
Nicolas Pitre31f42332005-02-08 17:45:55 +0000892 case OTPSELECT:
893 {
894 int mode;
895 if (copy_from_user(&mode, argp, sizeof(int)))
896 return -EFAULT;
Thomas Gleixnerf1a28c02006-05-30 00:37:34 +0200897
Brian Norrisbeb133f2011-08-30 18:45:41 -0700898 mfi->mode = MTD_FILE_MODE_NORMAL;
Thomas Gleixnerf1a28c02006-05-30 00:37:34 +0200899
900 ret = otp_select_filemode(mfi, mode);
901
Nicolas Pitre81dba482005-04-01 16:36:15 +0100902 file->f_pos = 0;
Nicolas Pitre31f42332005-02-08 17:45:55 +0000903 break;
904 }
905
906 case OTPGETREGIONCOUNT:
907 case OTPGETREGIONINFO:
908 {
909 struct otp_info *buf = kmalloc(4096, GFP_KERNEL);
910 if (!buf)
911 return -ENOMEM;
Thomas Gleixnerf1a28c02006-05-30 00:37:34 +0200912 switch (mfi->mode) {
Brian Norrisbeb133f2011-08-30 18:45:41 -0700913 case MTD_FILE_MODE_OTP_FACTORY:
Artem Bityutskiy87e858a92011-12-28 18:47:46 +0200914 ret = mtd_get_fact_prot_info(mtd, buf, 4096);
Nicolas Pitre31f42332005-02-08 17:45:55 +0000915 break;
Brian Norrisbeb133f2011-08-30 18:45:41 -0700916 case MTD_FILE_MODE_OTP_USER:
Artem Bityutskiy87e858a92011-12-28 18:47:46 +0200917 ret = mtd_get_user_prot_info(mtd, buf, 4096);
Nicolas Pitre31f42332005-02-08 17:45:55 +0000918 break;
Thomas Gleixnerf1a28c02006-05-30 00:37:34 +0200919 default:
Artem Bityutskiy87e858a92011-12-28 18:47:46 +0200920 ret = -EINVAL;
Thomas Gleixnerf1a28c02006-05-30 00:37:34 +0200921 break;
Nicolas Pitre31f42332005-02-08 17:45:55 +0000922 }
923 if (ret >= 0) {
924 if (cmd == OTPGETREGIONCOUNT) {
925 int nbr = ret / sizeof(struct otp_info);
926 ret = copy_to_user(argp, &nbr, sizeof(int));
927 } else
928 ret = copy_to_user(argp, buf, ret);
929 if (ret)
930 ret = -EFAULT;
931 }
932 kfree(buf);
933 break;
934 }
935
936 case OTPLOCK:
937 {
Harvey Harrison175428b2008-07-03 23:40:14 -0700938 struct otp_info oinfo;
Nicolas Pitre31f42332005-02-08 17:45:55 +0000939
Brian Norrisbeb133f2011-08-30 18:45:41 -0700940 if (mfi->mode != MTD_FILE_MODE_OTP_USER)
Nicolas Pitre31f42332005-02-08 17:45:55 +0000941 return -EINVAL;
Harvey Harrison175428b2008-07-03 23:40:14 -0700942 if (copy_from_user(&oinfo, argp, sizeof(oinfo)))
Nicolas Pitre31f42332005-02-08 17:45:55 +0000943 return -EFAULT;
Artem Bityutskiy4403dbfb2011-12-23 18:55:49 +0200944 ret = mtd_lock_user_prot_reg(mtd, oinfo.start, oinfo.length);
Nicolas Pitre31f42332005-02-08 17:45:55 +0000945 break;
946 }
947#endif
948
Brian Norris7854d3f2011-06-23 14:12:08 -0700949 /* This ioctl is being deprecated - it truncates the ECC layout */
Thomas Gleixnerf1a28c02006-05-30 00:37:34 +0200950 case ECCGETLAYOUT:
951 {
Brian Norriscc26c3c2010-08-24 18:12:00 -0700952 struct nand_ecclayout_user *usrlay;
953
Thomas Gleixnerf1a28c02006-05-30 00:37:34 +0200954 if (!mtd->ecclayout)
955 return -EOPNOTSUPP;
956
Brian Norriscc26c3c2010-08-24 18:12:00 -0700957 usrlay = kmalloc(sizeof(*usrlay), GFP_KERNEL);
958 if (!usrlay)
959 return -ENOMEM;
960
961 shrink_ecclayout(mtd->ecclayout, usrlay);
962
963 if (copy_to_user(argp, usrlay, sizeof(*usrlay)))
964 ret = -EFAULT;
965 kfree(usrlay);
Thomas Gleixnerf1a28c02006-05-30 00:37:34 +0200966 break;
967 }
968
969 case ECCGETSTATS:
970 {
971 if (copy_to_user(argp, &mtd->ecc_stats,
972 sizeof(struct mtd_ecc_stats)))
973 return -EFAULT;
974 break;
975 }
976
977 case MTDFILEMODE:
978 {
979 mfi->mode = 0;
980
981 switch(arg) {
Brian Norrisbeb133f2011-08-30 18:45:41 -0700982 case MTD_FILE_MODE_OTP_FACTORY:
983 case MTD_FILE_MODE_OTP_USER:
Thomas Gleixnerf1a28c02006-05-30 00:37:34 +0200984 ret = otp_select_filemode(mfi, arg);
985 break;
986
Brian Norrisbeb133f2011-08-30 18:45:41 -0700987 case MTD_FILE_MODE_RAW:
Artem Bityutskiyfc002e32011-12-28 18:35:07 +0200988 if (!mtd_has_oob(mtd))
Thomas Gleixnerf1a28c02006-05-30 00:37:34 +0200989 return -EOPNOTSUPP;
990 mfi->mode = arg;
991
Brian Norrisbeb133f2011-08-30 18:45:41 -0700992 case MTD_FILE_MODE_NORMAL:
Thomas Gleixnerf1a28c02006-05-30 00:37:34 +0200993 break;
994 default:
995 ret = -EINVAL;
996 }
997 file->f_pos = 0;
998 break;
999 }
1000
Roman Tereshonkovd0f79592010-09-17 13:31:42 +03001001 case BLKPG:
1002 {
Artem Bityutskiy969e57a2011-12-23 17:27:46 +02001003 ret = mtdchar_blkpg_ioctl(mtd,
Roman Tereshonkovd0f79592010-09-17 13:31:42 +03001004 (struct blkpg_ioctl_arg __user *)arg);
1005 break;
1006 }
1007
1008 case BLKRRPART:
1009 {
1010 /* No reread partition feature. Just return ok */
1011 ret = 0;
1012 break;
1013 }
Roman Tereshonkovd0f79592010-09-17 13:31:42 +03001014
Linus Torvalds1da177e2005-04-16 15:20:36 -07001015 default:
1016 ret = -ENOTTY;
1017 }
1018
1019 return ret;
1020} /* memory_ioctl */
1021
Artem Bityutskiy969e57a2011-12-23 17:27:46 +02001022static long mtdchar_unlocked_ioctl(struct file *file, u_int cmd, u_long arg)
Arnd Bergmann55929332010-04-27 00:24:05 +02001023{
1024 int ret;
1025
Arnd Bergmann5aa82942010-06-02 14:28:52 +02001026 mutex_lock(&mtd_mutex);
Artem Bityutskiy969e57a2011-12-23 17:27:46 +02001027 ret = mtdchar_ioctl(file, cmd, arg);
Arnd Bergmann5aa82942010-06-02 14:28:52 +02001028 mutex_unlock(&mtd_mutex);
Arnd Bergmann55929332010-04-27 00:24:05 +02001029
1030 return ret;
1031}
1032
Kevin Cernekee97718542009-04-08 22:53:13 -07001033#ifdef CONFIG_COMPAT
1034
1035struct mtd_oob_buf32 {
1036 u_int32_t start;
1037 u_int32_t length;
1038 compat_caddr_t ptr; /* unsigned char* */
1039};
1040
1041#define MEMWRITEOOB32 _IOWR('M', 3, struct mtd_oob_buf32)
1042#define MEMREADOOB32 _IOWR('M', 4, struct mtd_oob_buf32)
1043
Artem Bityutskiy969e57a2011-12-23 17:27:46 +02001044static long mtdchar_compat_ioctl(struct file *file, unsigned int cmd,
Kevin Cernekee97718542009-04-08 22:53:13 -07001045 unsigned long arg)
1046{
1047 struct mtd_file_info *mfi = file->private_data;
1048 struct mtd_info *mtd = mfi->mtd;
David Woodhouse0b6585c2009-05-29 16:09:08 +01001049 void __user *argp = compat_ptr(arg);
Kevin Cernekee97718542009-04-08 22:53:13 -07001050 int ret = 0;
1051
Arnd Bergmann5aa82942010-06-02 14:28:52 +02001052 mutex_lock(&mtd_mutex);
Kevin Cernekee97718542009-04-08 22:53:13 -07001053
1054 switch (cmd) {
1055 case MEMWRITEOOB32:
1056 {
1057 struct mtd_oob_buf32 buf;
1058 struct mtd_oob_buf32 __user *buf_user = argp;
1059
1060 if (copy_from_user(&buf, argp, sizeof(buf)))
1061 ret = -EFAULT;
1062 else
Artem Bityutskiy969e57a2011-12-23 17:27:46 +02001063 ret = mtdchar_writeoob(file, mtd, buf.start,
Kevin Cernekee97718542009-04-08 22:53:13 -07001064 buf.length, compat_ptr(buf.ptr),
1065 &buf_user->length);
1066 break;
1067 }
1068
1069 case MEMREADOOB32:
1070 {
1071 struct mtd_oob_buf32 buf;
1072 struct mtd_oob_buf32 __user *buf_user = argp;
1073
1074 /* NOTE: writes return length to buf->start */
1075 if (copy_from_user(&buf, argp, sizeof(buf)))
1076 ret = -EFAULT;
1077 else
Artem Bityutskiy969e57a2011-12-23 17:27:46 +02001078 ret = mtdchar_readoob(file, mtd, buf.start,
Kevin Cernekee97718542009-04-08 22:53:13 -07001079 buf.length, compat_ptr(buf.ptr),
1080 &buf_user->start);
1081 break;
1082 }
1083 default:
Artem Bityutskiy969e57a2011-12-23 17:27:46 +02001084 ret = mtdchar_ioctl(file, cmd, (unsigned long)argp);
Kevin Cernekee97718542009-04-08 22:53:13 -07001085 }
1086
Arnd Bergmann5aa82942010-06-02 14:28:52 +02001087 mutex_unlock(&mtd_mutex);
Kevin Cernekee97718542009-04-08 22:53:13 -07001088
1089 return ret;
1090}
1091
1092#endif /* CONFIG_COMPAT */
1093
David Howells402d3262009-02-12 10:40:00 +00001094/*
1095 * try to determine where a shared mapping can be made
1096 * - only supported for NOMMU at the moment (MMU can't doesn't copy private
1097 * mappings)
1098 */
1099#ifndef CONFIG_MMU
Artem Bityutskiy969e57a2011-12-23 17:27:46 +02001100static unsigned long mtdchar_get_unmapped_area(struct file *file,
David Howells402d3262009-02-12 10:40:00 +00001101 unsigned long addr,
1102 unsigned long len,
1103 unsigned long pgoff,
1104 unsigned long flags)
1105{
1106 struct mtd_file_info *mfi = file->private_data;
1107 struct mtd_info *mtd = mfi->mtd;
Artem Bityutskiycd621272011-12-30 14:31:57 +02001108 unsigned long offset;
1109 int ret;
David Howells402d3262009-02-12 10:40:00 +00001110
Artem Bityutskiycd621272011-12-30 14:31:57 +02001111 if (addr != 0)
1112 return (unsigned long) -EINVAL;
David Howells402d3262009-02-12 10:40:00 +00001113
Artem Bityutskiycd621272011-12-30 14:31:57 +02001114 if (len > mtd->size || pgoff >= (mtd->size >> PAGE_SHIFT))
1115 return (unsigned long) -EINVAL;
David Howells402d3262009-02-12 10:40:00 +00001116
Artem Bityutskiycd621272011-12-30 14:31:57 +02001117 offset = pgoff << PAGE_SHIFT;
1118 if (offset > mtd->size - len)
1119 return (unsigned long) -EINVAL;
David Howells402d3262009-02-12 10:40:00 +00001120
Artem Bityutskiycd621272011-12-30 14:31:57 +02001121 ret = mtd_get_unmapped_area(mtd, len, offset, flags);
1122 return ret == -EOPNOTSUPP ? -ENOSYS : ret;
David Howells402d3262009-02-12 10:40:00 +00001123}
1124#endif
1125
1126/*
1127 * set up a mapping for shared memory segments
1128 */
Artem Bityutskiy969e57a2011-12-23 17:27:46 +02001129static int mtdchar_mmap(struct file *file, struct vm_area_struct *vma)
David Howells402d3262009-02-12 10:40:00 +00001130{
1131#ifdef CONFIG_MMU
1132 struct mtd_file_info *mfi = file->private_data;
1133 struct mtd_info *mtd = mfi->mtd;
Anatolij Gustschindd02b672010-06-15 09:30:15 +02001134 struct map_info *map = mtd->priv;
1135 unsigned long start;
1136 unsigned long off;
1137 u32 len;
David Howells402d3262009-02-12 10:40:00 +00001138
Anatolij Gustschindd02b672010-06-15 09:30:15 +02001139 if (mtd->type == MTD_RAM || mtd->type == MTD_ROM) {
1140 off = vma->vm_pgoff << PAGE_SHIFT;
1141 start = map->phys;
1142 len = PAGE_ALIGN((start & ~PAGE_MASK) + map->size);
1143 start &= PAGE_MASK;
1144 if ((vma->vm_end - vma->vm_start + off) > len)
1145 return -EINVAL;
1146
1147 off += start;
1148 vma->vm_pgoff = off >> PAGE_SHIFT;
1149 vma->vm_flags |= VM_IO | VM_RESERVED;
1150
1151#ifdef pgprot_noncached
1152 if (file->f_flags & O_DSYNC || off >= __pa(high_memory))
1153 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
1154#endif
1155 if (io_remap_pfn_range(vma, vma->vm_start, off >> PAGE_SHIFT,
1156 vma->vm_end - vma->vm_start,
1157 vma->vm_page_prot))
1158 return -EAGAIN;
1159
David Howells402d3262009-02-12 10:40:00 +00001160 return 0;
Anatolij Gustschindd02b672010-06-15 09:30:15 +02001161 }
David Howells402d3262009-02-12 10:40:00 +00001162 return -ENOSYS;
1163#else
1164 return vma->vm_flags & VM_SHARED ? 0 : -ENOSYS;
1165#endif
1166}
1167
Arjan van de Vend54b1fd2007-02-12 00:55:34 -08001168static const struct file_operations mtd_fops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001169 .owner = THIS_MODULE,
Artem Bityutskiy969e57a2011-12-23 17:27:46 +02001170 .llseek = mtdchar_lseek,
1171 .read = mtdchar_read,
1172 .write = mtdchar_write,
1173 .unlocked_ioctl = mtdchar_unlocked_ioctl,
Kevin Cernekee97718542009-04-08 22:53:13 -07001174#ifdef CONFIG_COMPAT
Artem Bityutskiy969e57a2011-12-23 17:27:46 +02001175 .compat_ioctl = mtdchar_compat_ioctl,
Kevin Cernekee97718542009-04-08 22:53:13 -07001176#endif
Artem Bityutskiy969e57a2011-12-23 17:27:46 +02001177 .open = mtdchar_open,
1178 .release = mtdchar_close,
1179 .mmap = mtdchar_mmap,
David Howells402d3262009-02-12 10:40:00 +00001180#ifndef CONFIG_MMU
Artem Bityutskiy969e57a2011-12-23 17:27:46 +02001181 .get_unmapped_area = mtdchar_get_unmapped_area,
David Howells402d3262009-02-12 10:40:00 +00001182#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001183};
1184
Al Viro00292bb2012-03-23 13:47:52 -04001185static const struct super_operations mtd_ops = {
1186 .drop_inode = generic_delete_inode,
1187 .statfs = simple_statfs,
1188};
1189
Al Viro51139ad2010-07-25 23:47:46 +04001190static struct dentry *mtd_inodefs_mount(struct file_system_type *fs_type,
1191 int flags, const char *dev_name, void *data)
Kirill A. Shutemovcd874232010-05-17 16:55:47 +03001192{
Al Viro00292bb2012-03-23 13:47:52 -04001193 return mount_pseudo(fs_type, "mtd_inode:", &mtd_ops, NULL, MTD_INODE_FS_MAGIC);
Kirill A. Shutemovcd874232010-05-17 16:55:47 +03001194}
1195
1196static struct file_system_type mtd_inodefs_type = {
1197 .name = "mtd_inodefs",
Al Viro51139ad2010-07-25 23:47:46 +04001198 .mount = mtd_inodefs_mount,
Kirill A. Shutemovcd874232010-05-17 16:55:47 +03001199 .kill_sb = kill_anon_super,
1200};
1201
Linus Torvalds1da177e2005-04-16 15:20:36 -07001202static int __init init_mtdchar(void)
1203{
Kirill A. Shutemovcd874232010-05-17 16:55:47 +03001204 int ret;
David Brownell1f24b5a2009-03-26 00:42:41 -07001205
Kirill A. Shutemovcd874232010-05-17 16:55:47 +03001206 ret = __register_chrdev(MTD_CHAR_MAJOR, 0, 1 << MINORBITS,
Ben Hutchingsdad0db32010-01-29 21:00:04 +00001207 "mtd", &mtd_fops);
Kirill A. Shutemovcd874232010-05-17 16:55:47 +03001208 if (ret < 0) {
1209 pr_notice("Can't allocate major number %d for "
1210 "Memory Technology Devices.\n", MTD_CHAR_MAJOR);
1211 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001212 }
1213
Kirill A. Shutemovcd874232010-05-17 16:55:47 +03001214 ret = register_filesystem(&mtd_inodefs_type);
1215 if (ret) {
1216 pr_notice("Can't register mtd_inodefs filesystem: %d\n", ret);
1217 goto err_unregister_chdev;
1218 }
Kirill A. Shutemovcd874232010-05-17 16:55:47 +03001219 return ret;
1220
Kirill A. Shutemovcd874232010-05-17 16:55:47 +03001221err_unregister_chdev:
1222 __unregister_chrdev(MTD_CHAR_MAJOR, 0, 1 << MINORBITS, "mtd");
1223 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001224}
1225
1226static void __exit cleanup_mtdchar(void)
1227{
Kirill A. Shutemovcd874232010-05-17 16:55:47 +03001228 unregister_filesystem(&mtd_inodefs_type);
Ben Hutchingsdad0db32010-01-29 21:00:04 +00001229 __unregister_chrdev(MTD_CHAR_MAJOR, 0, 1 << MINORBITS, "mtd");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001230}
1231
1232module_init(init_mtdchar);
1233module_exit(cleanup_mtdchar);
1234
David Brownell1f24b5a2009-03-26 00:42:41 -07001235MODULE_ALIAS_CHARDEV_MAJOR(MTD_CHAR_MAJOR);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001236
1237MODULE_LICENSE("GPL");
1238MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
1239MODULE_DESCRIPTION("Direct character-device access to MTD devices");
Scott James Remnant90160e12009-03-02 18:42:39 +00001240MODULE_ALIAS_CHARDEV_MAJOR(MTD_CHAR_MAJOR);