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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>
Ezequiel Garciaf83c3832013-10-13 18:05:23 -030035#include <linux/major.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070036#include <linux/mtd/mtd.h>
Roman Tereshonkovd0f79592010-09-17 13:31:42 +030037#include <linux/mtd/partitions.h>
Anatolij Gustschindd02b672010-06-15 09:30:15 +020038#include <linux/mtd/map.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070039
Thomas Gleixner15fdc522005-11-07 00:14:42 +010040#include <asm/uaccess.h>
Todd Poynor9bc7b382005-06-30 01:23:27 +010041
Artem Bityutskiy660685d2013-03-14 13:27:40 +020042#include "mtdcore.h"
43
Arnd Bergmann5aa82942010-06-02 14:28:52 +020044static DEFINE_MUTEX(mtd_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -070045
Nicolas Pitre045e9a52005-02-08 19:12:53 +000046/*
Thomas Gleixnerf1a28c02006-05-30 00:37:34 +020047 * Data structure to hold the pointer to the mtd device as well
Brian Norris92394b5c2011-07-20 09:53:42 -070048 * as mode information of various use cases.
Nicolas Pitre045e9a52005-02-08 19:12:53 +000049 */
Thomas Gleixnerf1a28c02006-05-30 00:37:34 +020050struct mtd_file_info {
51 struct mtd_info *mtd;
52 enum mtd_file_modes mode;
53};
Nicolas Pitre31f42332005-02-08 17:45:55 +000054
Artem Bityutskiy969e57a2011-12-23 17:27:46 +020055static loff_t mtdchar_lseek(struct file *file, loff_t offset, int orig)
Linus Torvalds1da177e2005-04-16 15:20:36 -070056{
Thomas Gleixnerf1a28c02006-05-30 00:37:34 +020057 struct mtd_file_info *mfi = file->private_data;
Al Virob9599572013-06-16 20:27:42 +040058 return fixed_size_llseek(file, offset, orig, mfi->mtd->size);
Linus Torvalds1da177e2005-04-16 15:20:36 -070059}
60
Artem Bityutskiy969e57a2011-12-23 17:27:46 +020061static int mtdchar_open(struct inode *inode, struct file *file)
Linus Torvalds1da177e2005-04-16 15:20:36 -070062{
63 int minor = iminor(inode);
64 int devnum = minor >> 1;
Jonathan Corbet60712392008-05-15 10:10:37 -060065 int ret = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -070066 struct mtd_info *mtd;
Thomas Gleixnerf1a28c02006-05-30 00:37:34 +020067 struct mtd_file_info *mfi;
Linus Torvalds1da177e2005-04-16 15:20:36 -070068
Brian Norris289c0522011-07-19 10:06:09 -070069 pr_debug("MTD_open\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -070070
Linus Torvalds1da177e2005-04-16 15:20:36 -070071 /* You can't open the RO devices RW */
Al Viroaeb5d722008-09-02 15:28:45 -040072 if ((file->f_mode & FMODE_WRITE) && (minor & 1))
Linus Torvalds1da177e2005-04-16 15:20:36 -070073 return -EACCES;
74
Arnd Bergmann5aa82942010-06-02 14:28:52 +020075 mutex_lock(&mtd_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -070076 mtd = get_mtd_device(NULL, devnum);
Thomas Gleixner97894cd2005-11-07 11:15:26 +000077
Jonathan Corbet60712392008-05-15 10:10:37 -060078 if (IS_ERR(mtd)) {
79 ret = PTR_ERR(mtd);
80 goto out;
81 }
Thomas Gleixner97894cd2005-11-07 11:15:26 +000082
David Howells402d3262009-02-12 10:40:00 +000083 if (mtd->type == MTD_ABSENT) {
Jonathan Corbet60712392008-05-15 10:10:37 -060084 ret = -ENODEV;
Al Viroc65390f2012-04-09 01:36:28 -040085 goto out1;
Linus Torvalds1da177e2005-04-16 15:20:36 -070086 }
87
Linus Torvalds1da177e2005-04-16 15:20:36 -070088 /* You can't open it RW if it's not a writeable device */
Al Viroaeb5d722008-09-02 15:28:45 -040089 if ((file->f_mode & FMODE_WRITE) && !(mtd->flags & MTD_WRITEABLE)) {
Jonathan Corbet60712392008-05-15 10:10:37 -060090 ret = -EACCES;
Christoph Hellwigb4caecd2015-01-14 10:42:32 +010091 goto out1;
Linus Torvalds1da177e2005-04-16 15:20:36 -070092 }
Thomas Gleixner97894cd2005-11-07 11:15:26 +000093
Thomas Gleixnerf1a28c02006-05-30 00:37:34 +020094 mfi = kzalloc(sizeof(*mfi), GFP_KERNEL);
95 if (!mfi) {
Jonathan Corbet60712392008-05-15 10:10:37 -060096 ret = -ENOMEM;
Christoph Hellwigb4caecd2015-01-14 10:42:32 +010097 goto out1;
Thomas Gleixnerf1a28c02006-05-30 00:37:34 +020098 }
99 mfi->mtd = mtd;
100 file->private_data = mfi;
Al Viroc65390f2012-04-09 01:36:28 -0400101 mutex_unlock(&mtd_mutex);
102 return 0;
Thomas Gleixnerf1a28c02006-05-30 00:37:34 +0200103
Al Viroc65390f2012-04-09 01:36:28 -0400104out1:
105 put_mtd_device(mtd);
Jonathan Corbet60712392008-05-15 10:10:37 -0600106out:
Arnd Bergmann5aa82942010-06-02 14:28:52 +0200107 mutex_unlock(&mtd_mutex);
Jonathan Corbet60712392008-05-15 10:10:37 -0600108 return ret;
Artem Bityutskiy969e57a2011-12-23 17:27:46 +0200109} /* mtdchar_open */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110
111/*====================================================================*/
112
Artem Bityutskiy969e57a2011-12-23 17:27:46 +0200113static int mtdchar_close(struct inode *inode, struct file *file)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114{
Thomas Gleixnerf1a28c02006-05-30 00:37:34 +0200115 struct mtd_file_info *mfi = file->private_data;
116 struct mtd_info *mtd = mfi->mtd;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700117
Brian Norris289c0522011-07-19 10:06:09 -0700118 pr_debug("MTD_close\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119
Joakim Tjernlund7eafaed2007-06-27 00:56:40 +0200120 /* Only sync if opened RW */
Artem Bityutskiy327cf292011-12-30 16:35:35 +0200121 if ((file->f_mode & FMODE_WRITE))
Artem Bityutskiy85f2f2a2011-12-23 19:03:12 +0200122 mtd_sync(mtd);
Thomas Gleixner97894cd2005-11-07 11:15:26 +0000123
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124 put_mtd_device(mtd);
Thomas Gleixnerf1a28c02006-05-30 00:37:34 +0200125 file->private_data = NULL;
126 kfree(mfi);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127
128 return 0;
Artem Bityutskiy969e57a2011-12-23 17:27:46 +0200129} /* mtdchar_close */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130
Grant Erickson3e45cf52011-04-08 08:51:33 -0700131/* Back in June 2001, dwmw2 wrote:
132 *
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.
135 *
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.
140 *
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.
147 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148
Artem Bityutskiy969e57a2011-12-23 17:27:46 +0200149static ssize_t mtdchar_read(struct file *file, char __user *buf, size_t count,
150 loff_t *ppos)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151{
Thomas Gleixnerf1a28c02006-05-30 00:37:34 +0200152 struct mtd_file_info *mfi = file->private_data;
153 struct mtd_info *mtd = mfi->mtd;
Artem Bityutskiy30fa9842011-12-29 15:16:28 +0200154 size_t retlen;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155 size_t total_retlen=0;
156 int ret=0;
157 int len;
Grant Erickson3e45cf52011-04-08 08:51:33 -0700158 size_t size = count;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159 char *kbuf;
Thomas Gleixner97894cd2005-11-07 11:15:26 +0000160
Brian Norris289c0522011-07-19 10:06:09 -0700161 pr_debug("MTD_read\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162
163 if (*ppos + count > mtd->size)
164 count = mtd->size - *ppos;
165
166 if (!count)
167 return 0;
Thomas Gleixner97894cd2005-11-07 11:15:26 +0000168
Grant Erickson3e45cf52011-04-08 08:51:33 -0700169 kbuf = mtd_kmalloc_up_to(mtd, &size);
Thago Galesib802c072006-04-17 17:38:15 +0100170 if (!kbuf)
171 return -ENOMEM;
172
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173 while (count) {
Grant Erickson3e45cf52011-04-08 08:51:33 -0700174 len = min_t(size_t, count, size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175
Thomas Gleixnerf1a28c02006-05-30 00:37:34 +0200176 switch (mfi->mode) {
Brian Norrisbeb133f2011-08-30 18:45:41 -0700177 case MTD_FILE_MODE_OTP_FACTORY:
Artem Bityutskiyd264f722011-12-23 18:40:06 +0200178 ret = mtd_read_fact_prot_reg(mtd, *ppos, len,
179 &retlen, kbuf);
Nicolas Pitre31f42332005-02-08 17:45:55 +0000180 break;
Brian Norrisbeb133f2011-08-30 18:45:41 -0700181 case MTD_FILE_MODE_OTP_USER:
Artem Bityutskiy4ea1cab2011-12-23 18:47:59 +0200182 ret = mtd_read_user_prot_reg(mtd, *ppos, len,
183 &retlen, kbuf);
Nicolas Pitre31f42332005-02-08 17:45:55 +0000184 break;
Brian Norrisbeb133f2011-08-30 18:45:41 -0700185 case MTD_FILE_MODE_RAW:
Thomas Gleixnerf1a28c02006-05-30 00:37:34 +0200186 {
187 struct mtd_oob_ops ops;
188
Brian Norris0612b9d2011-08-30 18:45:40 -0700189 ops.mode = MTD_OPS_RAW;
Thomas Gleixnerf1a28c02006-05-30 00:37:34 +0200190 ops.datbuf = kbuf;
191 ops.oobbuf = NULL;
192 ops.len = len;
193
Artem Bityutskiyfd2819b2011-12-23 18:27:05 +0200194 ret = mtd_read_oob(mtd, *ppos, &ops);
Thomas Gleixnerf1a28c02006-05-30 00:37:34 +0200195 retlen = ops.retlen;
196 break;
197 }
Nicolas Pitre31f42332005-02-08 17:45:55 +0000198 default:
Artem Bityutskiy329ad392011-12-23 17:30:16 +0200199 ret = mtd_read(mtd, *ppos, len, &retlen, kbuf);
Nicolas Pitre31f42332005-02-08 17:45:55 +0000200 }
Brian Norris7854d3f2011-06-23 14:12:08 -0700201 /* Nand returns -EBADMSG on ECC errors, but it returns
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202 * the data. For our userspace tools it is important
Brian Norris7854d3f2011-06-23 14:12:08 -0700203 * to dump areas with ECC errors!
Thomas Gleixner9a1fcdf2006-05-29 14:56:39 +0200204 * For kernel internal usage it also might return -EUCLEAN
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300205 * to signal the caller that a bitflip has occurred and has
Thomas Gleixner9a1fcdf2006-05-29 14:56:39 +0200206 * been corrected by the ECC algorithm.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207 * Userspace software which accesses NAND this way
208 * must be aware of the fact that it deals with NAND
209 */
Brian Norrisd57f40542011-09-20 18:34:25 -0700210 if (!ret || mtd_is_bitflip_or_eccerr(ret)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211 *ppos += retlen;
212 if (copy_to_user(buf, kbuf, retlen)) {
Thomas Gleixnerf4a43cf2006-05-28 11:01:53 +0200213 kfree(kbuf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214 return -EFAULT;
215 }
216 else
217 total_retlen += retlen;
218
219 count -= retlen;
220 buf += retlen;
Nicolas Pitre31f42332005-02-08 17:45:55 +0000221 if (retlen == 0)
222 count = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223 }
224 else {
225 kfree(kbuf);
226 return ret;
227 }
Thomas Gleixner97894cd2005-11-07 11:15:26 +0000228
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229 }
230
Thago Galesib802c072006-04-17 17:38:15 +0100231 kfree(kbuf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700232 return total_retlen;
Artem Bityutskiy969e57a2011-12-23 17:27:46 +0200233} /* mtdchar_read */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234
Artem Bityutskiy969e57a2011-12-23 17:27:46 +0200235static ssize_t mtdchar_write(struct file *file, const char __user *buf, size_t count,
236 loff_t *ppos)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700237{
Thomas Gleixnerf1a28c02006-05-30 00:37:34 +0200238 struct mtd_file_info *mfi = file->private_data;
239 struct mtd_info *mtd = mfi->mtd;
Grant Erickson3e45cf52011-04-08 08:51:33 -0700240 size_t size = count;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700241 char *kbuf;
242 size_t retlen;
243 size_t total_retlen=0;
244 int ret=0;
245 int len;
246
Brian Norris289c0522011-07-19 10:06:09 -0700247 pr_debug("MTD_write\n");
Thomas Gleixner97894cd2005-11-07 11:15:26 +0000248
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249 if (*ppos == mtd->size)
250 return -ENOSPC;
Thomas Gleixner97894cd2005-11-07 11:15:26 +0000251
Linus Torvalds1da177e2005-04-16 15:20:36 -0700252 if (*ppos + count > mtd->size)
253 count = mtd->size - *ppos;
254
255 if (!count)
256 return 0;
257
Grant Erickson3e45cf52011-04-08 08:51:33 -0700258 kbuf = mtd_kmalloc_up_to(mtd, &size);
Thago Galesib802c072006-04-17 17:38:15 +0100259 if (!kbuf)
260 return -ENOMEM;
261
Linus Torvalds1da177e2005-04-16 15:20:36 -0700262 while (count) {
Grant Erickson3e45cf52011-04-08 08:51:33 -0700263 len = min_t(size_t, count, size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700264
Linus Torvalds1da177e2005-04-16 15:20:36 -0700265 if (copy_from_user(kbuf, buf, len)) {
266 kfree(kbuf);
267 return -EFAULT;
268 }
Thomas Gleixner97894cd2005-11-07 11:15:26 +0000269
Thomas Gleixnerf1a28c02006-05-30 00:37:34 +0200270 switch (mfi->mode) {
Brian Norrisbeb133f2011-08-30 18:45:41 -0700271 case MTD_FILE_MODE_OTP_FACTORY:
Nicolas Pitre31f42332005-02-08 17:45:55 +0000272 ret = -EROFS;
273 break;
Brian Norrisbeb133f2011-08-30 18:45:41 -0700274 case MTD_FILE_MODE_OTP_USER:
Artem Bityutskiy482b43a2011-12-23 18:50:04 +0200275 ret = mtd_write_user_prot_reg(mtd, *ppos, len,
276 &retlen, kbuf);
Nicolas Pitre31f42332005-02-08 17:45:55 +0000277 break;
Thomas Gleixnerf1a28c02006-05-30 00:37:34 +0200278
Brian Norrisbeb133f2011-08-30 18:45:41 -0700279 case MTD_FILE_MODE_RAW:
Thomas Gleixnerf1a28c02006-05-30 00:37:34 +0200280 {
281 struct mtd_oob_ops ops;
282
Brian Norris0612b9d2011-08-30 18:45:40 -0700283 ops.mode = MTD_OPS_RAW;
Thomas Gleixnerf1a28c02006-05-30 00:37:34 +0200284 ops.datbuf = kbuf;
285 ops.oobbuf = NULL;
Peter Wippichbf514082011-06-06 15:50:58 +0200286 ops.ooboffs = 0;
Thomas Gleixnerf1a28c02006-05-30 00:37:34 +0200287 ops.len = len;
288
Artem Bityutskiya2cc5ba2011-12-23 18:29:55 +0200289 ret = mtd_write_oob(mtd, *ppos, &ops);
Thomas Gleixnerf1a28c02006-05-30 00:37:34 +0200290 retlen = ops.retlen;
291 break;
292 }
293
Nicolas Pitre31f42332005-02-08 17:45:55 +0000294 default:
Artem Bityutskiyeda95cb2011-12-23 17:35:41 +0200295 ret = mtd_write(mtd, *ppos, len, &retlen, kbuf);
Nicolas Pitre31f42332005-02-08 17:45:55 +0000296 }
Christian Riesch9a78bc82014-03-06 12:42:37 +0100297
298 /*
299 * Return -ENOSPC only if no data could be written at all.
300 * Otherwise just return the number of bytes that actually
301 * have been written.
302 */
303 if ((ret == -ENOSPC) && (total_retlen))
304 break;
305
Linus Torvalds1da177e2005-04-16 15:20:36 -0700306 if (!ret) {
307 *ppos += retlen;
308 total_retlen += retlen;
309 count -= retlen;
310 buf += retlen;
311 }
312 else {
313 kfree(kbuf);
314 return ret;
315 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700316 }
317
Thago Galesib802c072006-04-17 17:38:15 +0100318 kfree(kbuf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319 return total_retlen;
Artem Bityutskiy969e57a2011-12-23 17:27:46 +0200320} /* mtdchar_write */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700321
322/*======================================================================
323
324 IOCTL calls for getting device parameters.
325
326======================================================================*/
327static void mtdchar_erase_callback (struct erase_info *instr)
328{
329 wake_up((wait_queue_head_t *)instr->priv);
330}
331
Thomas Gleixnerf1a28c02006-05-30 00:37:34 +0200332static int otp_select_filemode(struct mtd_file_info *mfi, int mode)
333{
334 struct mtd_info *mtd = mfi->mtd;
Artem Bityutskiyb6de3d62011-12-29 10:06:32 +0200335 size_t retlen;
Artem Bityutskiyb6de3d62011-12-29 10:06:32 +0200336
Thomas Gleixnerf1a28c02006-05-30 00:37:34 +0200337 switch (mode) {
338 case MTD_OTP_FACTORY:
Uwe Kleine-König5dc63fa2013-03-04 17:35:24 +0100339 if (mtd_read_fact_prot_reg(mtd, -1, 0, &retlen, NULL) ==
340 -EOPNOTSUPP)
341 return -EOPNOTSUPP;
342
Artem Bityutskiyb6de3d62011-12-29 10:06:32 +0200343 mfi->mode = MTD_FILE_MODE_OTP_FACTORY;
Thomas Gleixnerf1a28c02006-05-30 00:37:34 +0200344 break;
345 case MTD_OTP_USER:
Uwe Kleine-König5dc63fa2013-03-04 17:35:24 +0100346 if (mtd_read_user_prot_reg(mtd, -1, 0, &retlen, NULL) ==
347 -EOPNOTSUPP)
348 return -EOPNOTSUPP;
349
Artem Bityutskiyb6de3d62011-12-29 10:06:32 +0200350 mfi->mode = MTD_FILE_MODE_OTP_USER;
Thomas Gleixnerf1a28c02006-05-30 00:37:34 +0200351 break;
Thomas Gleixnerf1a28c02006-05-30 00:37:34 +0200352 case MTD_OTP_OFF:
Uwe Kleine-König5dc63fa2013-03-04 17:35:24 +0100353 mfi->mode = MTD_FILE_MODE_NORMAL;
Thomas Gleixnerf1a28c02006-05-30 00:37:34 +0200354 break;
Uwe Kleine-König5dc63fa2013-03-04 17:35:24 +0100355 default:
356 return -EINVAL;
Thomas Gleixnerf1a28c02006-05-30 00:37:34 +0200357 }
Uwe Kleine-König5dc63fa2013-03-04 17:35:24 +0100358
359 return 0;
Thomas Gleixnerf1a28c02006-05-30 00:37:34 +0200360}
Thomas Gleixnerf1a28c02006-05-30 00:37:34 +0200361
Artem Bityutskiy969e57a2011-12-23 17:27:46 +0200362static int mtdchar_writeoob(struct file *file, struct mtd_info *mtd,
Kevin Cernekee97718542009-04-08 22:53:13 -0700363 uint64_t start, uint32_t length, void __user *ptr,
364 uint32_t __user *retp)
365{
Brian Norris9ce244b2011-08-30 18:45:37 -0700366 struct mtd_file_info *mfi = file->private_data;
Kevin Cernekee97718542009-04-08 22:53:13 -0700367 struct mtd_oob_ops ops;
368 uint32_t retlen;
369 int ret = 0;
370
371 if (!(file->f_mode & FMODE_WRITE))
372 return -EPERM;
373
374 if (length > 4096)
375 return -EINVAL;
376
Artem Bityutskiy3c3c10b2012-01-30 14:58:32 +0200377 if (!mtd->_write_oob)
Kevin Cernekee97718542009-04-08 22:53:13 -0700378 ret = -EOPNOTSUPP;
379 else
Roel Kluin00404762010-01-29 10:35:04 +0100380 ret = access_ok(VERIFY_READ, ptr, length) ? 0 : -EFAULT;
Kevin Cernekee97718542009-04-08 22:53:13 -0700381
382 if (ret)
383 return ret;
384
385 ops.ooblen = length;
Brian Norris305b93f2011-08-23 17:17:32 -0700386 ops.ooboffs = start & (mtd->writesize - 1);
Kevin Cernekee97718542009-04-08 22:53:13 -0700387 ops.datbuf = NULL;
Brian Norrisbeb133f2011-08-30 18:45:41 -0700388 ops.mode = (mfi->mode == MTD_FILE_MODE_RAW) ? MTD_OPS_RAW :
Brian Norris0612b9d2011-08-30 18:45:40 -0700389 MTD_OPS_PLACE_OOB;
Kevin Cernekee97718542009-04-08 22:53:13 -0700390
391 if (ops.ooboffs && ops.ooblen > (mtd->oobsize - ops.ooboffs))
392 return -EINVAL;
393
Julia Lawalldf1f1d12010-05-22 10:22:49 +0200394 ops.oobbuf = memdup_user(ptr, length);
395 if (IS_ERR(ops.oobbuf))
396 return PTR_ERR(ops.oobbuf);
Kevin Cernekee97718542009-04-08 22:53:13 -0700397
Brian Norris305b93f2011-08-23 17:17:32 -0700398 start &= ~((uint64_t)mtd->writesize - 1);
Artem Bityutskiya2cc5ba2011-12-23 18:29:55 +0200399 ret = mtd_write_oob(mtd, start, &ops);
Kevin Cernekee97718542009-04-08 22:53:13 -0700400
401 if (ops.oobretlen > 0xFFFFFFFFU)
402 ret = -EOVERFLOW;
403 retlen = ops.oobretlen;
404 if (copy_to_user(retp, &retlen, sizeof(length)))
405 ret = -EFAULT;
406
407 kfree(ops.oobbuf);
408 return ret;
409}
410
Artem Bityutskiy969e57a2011-12-23 17:27:46 +0200411static int mtdchar_readoob(struct file *file, struct mtd_info *mtd,
Brian Norrisc46f6482011-08-30 18:45:38 -0700412 uint64_t start, uint32_t length, void __user *ptr,
413 uint32_t __user *retp)
Kevin Cernekee97718542009-04-08 22:53:13 -0700414{
Brian Norrisc46f6482011-08-30 18:45:38 -0700415 struct mtd_file_info *mfi = file->private_data;
Kevin Cernekee97718542009-04-08 22:53:13 -0700416 struct mtd_oob_ops ops;
417 int ret = 0;
418
419 if (length > 4096)
420 return -EINVAL;
421
Artem Bityutskiydac26392011-12-28 17:50:34 +0200422 if (!access_ok(VERIFY_WRITE, ptr, length))
423 return -EFAULT;
Kevin Cernekee97718542009-04-08 22:53:13 -0700424
425 ops.ooblen = length;
Brian Norris305b93f2011-08-23 17:17:32 -0700426 ops.ooboffs = start & (mtd->writesize - 1);
Kevin Cernekee97718542009-04-08 22:53:13 -0700427 ops.datbuf = NULL;
Brian Norrisbeb133f2011-08-30 18:45:41 -0700428 ops.mode = (mfi->mode == MTD_FILE_MODE_RAW) ? MTD_OPS_RAW :
Brian Norris0612b9d2011-08-30 18:45:40 -0700429 MTD_OPS_PLACE_OOB;
Kevin Cernekee97718542009-04-08 22:53:13 -0700430
431 if (ops.ooboffs && ops.ooblen > (mtd->oobsize - ops.ooboffs))
432 return -EINVAL;
433
434 ops.oobbuf = kmalloc(length, GFP_KERNEL);
435 if (!ops.oobbuf)
436 return -ENOMEM;
437
Brian Norris305b93f2011-08-23 17:17:32 -0700438 start &= ~((uint64_t)mtd->writesize - 1);
Artem Bityutskiyfd2819b2011-12-23 18:27:05 +0200439 ret = mtd_read_oob(mtd, start, &ops);
Kevin Cernekee97718542009-04-08 22:53:13 -0700440
441 if (put_user(ops.oobretlen, retp))
442 ret = -EFAULT;
443 else if (ops.oobretlen && copy_to_user(ptr, ops.oobbuf,
444 ops.oobretlen))
445 ret = -EFAULT;
446
447 kfree(ops.oobbuf);
Brian Norris041e4572011-06-23 16:45:24 -0700448
449 /*
450 * NAND returns -EBADMSG on ECC errors, but it returns the OOB
451 * data. For our userspace tools it is important to dump areas
452 * with ECC errors!
453 * For kernel internal usage it also might return -EUCLEAN
454 * to signal the caller that a bitflip has occured and has
455 * been corrected by the ECC algorithm.
456 *
Brian Norrisc478d7e2011-06-28 16:29:00 -0700457 * Note: currently the standard NAND function, nand_read_oob_std,
458 * does not calculate ECC for the OOB area, so do not rely on
459 * this behavior unless you have replaced it with your own.
Brian Norris041e4572011-06-23 16:45:24 -0700460 */
Brian Norrisd57f40542011-09-20 18:34:25 -0700461 if (mtd_is_bitflip_or_eccerr(ret))
Brian Norris041e4572011-06-23 16:45:24 -0700462 return 0;
463
Kevin Cernekee97718542009-04-08 22:53:13 -0700464 return ret;
465}
466
Brian Norriscc26c3c2010-08-24 18:12:00 -0700467/*
Boris Brezillonaab616e2016-02-04 10:16:18 +0100468 * Copies (and truncates, if necessary) OOB layout information to the
469 * deprecated layout struct, nand_ecclayout_user. This is necessary only to
470 * support the deprecated API ioctl ECCGETLAYOUT while allowing all new
471 * functionality to use mtd_ooblayout_ops flexibly (i.e. mtd_ooblayout_ops
472 * can describe any kind of OOB layout with almost zero overhead from a
473 * memory usage point of view).
Brian Norriscc26c3c2010-08-24 18:12:00 -0700474 */
Boris Brezillonc2b78452016-02-03 20:10:30 +0100475static int shrink_ecclayout(struct mtd_info *mtd,
476 struct nand_ecclayout_user *to)
Brian Norriscc26c3c2010-08-24 18:12:00 -0700477{
Boris Brezillonc2b78452016-02-03 20:10:30 +0100478 struct mtd_oob_region oobregion;
479 int i, section = 0, ret;
Brian Norriscc26c3c2010-08-24 18:12:00 -0700480
Boris Brezillonc2b78452016-02-03 20:10:30 +0100481 if (!mtd || !to)
Brian Norriscc26c3c2010-08-24 18:12:00 -0700482 return -EINVAL;
483
484 memset(to, 0, sizeof(*to));
485
Boris Brezillonc2b78452016-02-03 20:10:30 +0100486 to->eccbytes = 0;
487 for (i = 0; i < MTD_MAX_ECCPOS_ENTRIES;) {
488 u32 eccpos;
489
OuYang ZhiZhong9eab80e2018-03-11 15:59:07 +0800490 ret = mtd_ooblayout_ecc(mtd, section++, &oobregion);
Boris Brezillonc2b78452016-02-03 20:10:30 +0100491 if (ret < 0) {
492 if (ret != -ERANGE)
493 return ret;
494
495 break;
496 }
497
498 eccpos = oobregion.offset;
499 for (; i < MTD_MAX_ECCPOS_ENTRIES &&
500 eccpos < oobregion.offset + oobregion.length; i++) {
501 to->eccpos[i] = eccpos++;
502 to->eccbytes++;
503 }
504 }
Brian Norriscc26c3c2010-08-24 18:12:00 -0700505
506 for (i = 0; i < MTD_MAX_OOBFREE_ENTRIES; i++) {
Boris Brezillonc2b78452016-02-03 20:10:30 +0100507 ret = mtd_ooblayout_free(mtd, i, &oobregion);
508 if (ret < 0) {
509 if (ret != -ERANGE)
510 return ret;
511
Brian Norriscc26c3c2010-08-24 18:12:00 -0700512 break;
Boris Brezillonc2b78452016-02-03 20:10:30 +0100513 }
514
515 to->oobfree[i].offset = oobregion.offset;
516 to->oobfree[i].length = oobregion.length;
517 to->oobavail += to->oobfree[i].length;
Brian Norriscc26c3c2010-08-24 18:12:00 -0700518 }
519
520 return 0;
521}
522
Boris Brezillonc2b78452016-02-03 20:10:30 +0100523static int get_oobinfo(struct mtd_info *mtd, struct nand_oobinfo *to)
524{
525 struct mtd_oob_region oobregion;
526 int i, section = 0, ret;
527
528 if (!mtd || !to)
529 return -EINVAL;
530
531 memset(to, 0, sizeof(*to));
532
533 to->eccbytes = 0;
534 for (i = 0; i < ARRAY_SIZE(to->eccpos);) {
535 u32 eccpos;
536
OuYang ZhiZhong9eab80e2018-03-11 15:59:07 +0800537 ret = mtd_ooblayout_ecc(mtd, section++, &oobregion);
Boris Brezillonc2b78452016-02-03 20:10:30 +0100538 if (ret < 0) {
539 if (ret != -ERANGE)
540 return ret;
541
542 break;
543 }
544
545 if (oobregion.length + i > ARRAY_SIZE(to->eccpos))
546 return -EINVAL;
547
548 eccpos = oobregion.offset;
549 for (; eccpos < oobregion.offset + oobregion.length; i++) {
550 to->eccpos[i] = eccpos++;
551 to->eccbytes++;
552 }
553 }
554
555 for (i = 0; i < 8; i++) {
556 ret = mtd_ooblayout_free(mtd, i, &oobregion);
557 if (ret < 0) {
558 if (ret != -ERANGE)
559 return ret;
560
561 break;
562 }
563
564 to->oobfree[i][0] = oobregion.offset;
565 to->oobfree[i][1] = oobregion.length;
566 }
567
568 to->useecc = MTD_NANDECC_AUTOPLACE;
569
570 return 0;
571}
572
Artem Bityutskiy969e57a2011-12-23 17:27:46 +0200573static int mtdchar_blkpg_ioctl(struct mtd_info *mtd,
Brian Norris53bb7242015-09-21 13:26:59 -0700574 struct blkpg_ioctl_arg *arg)
Roman Tereshonkovd0f79592010-09-17 13:31:42 +0300575{
Roman Tereshonkovd0f79592010-09-17 13:31:42 +0300576 struct blkpg_partition p;
577
578 if (!capable(CAP_SYS_ADMIN))
579 return -EPERM;
580
Brian Norris53bb7242015-09-21 13:26:59 -0700581 if (copy_from_user(&p, arg->data, sizeof(p)))
Roman Tereshonkovd0f79592010-09-17 13:31:42 +0300582 return -EFAULT;
583
Brian Norris53bb7242015-09-21 13:26:59 -0700584 switch (arg->op) {
Roman Tereshonkovd0f79592010-09-17 13:31:42 +0300585 case BLKPG_ADD_PARTITION:
586
Roman Tereshonkova7e93dc2010-11-23 14:17:17 +0200587 /* Only master mtd device must be used to add partitions */
588 if (mtd_is_partition(mtd))
589 return -EINVAL;
590
Brian Norris1cc8d842014-07-21 19:08:13 -0700591 /* Sanitize user input */
592 p.devname[BLKPG_DEVNAMELTH - 1] = '\0';
593
Roman Tereshonkovd0f79592010-09-17 13:31:42 +0300594 return mtd_add_partition(mtd, p.devname, p.start, p.length);
595
596 case BLKPG_DEL_PARTITION:
597
598 if (p.pno < 0)
599 return -EINVAL;
600
601 return mtd_del_partition(mtd, p.pno);
602
603 default:
604 return -EINVAL;
605 }
606}
Roman Tereshonkovd0f79592010-09-17 13:31:42 +0300607
Artem Bityutskiy969e57a2011-12-23 17:27:46 +0200608static int mtdchar_write_ioctl(struct mtd_info *mtd,
Brian Norrise99d8b02011-09-09 09:59:03 -0700609 struct mtd_write_req __user *argp)
610{
611 struct mtd_write_req req;
612 struct mtd_oob_ops ops;
Geert Uytterhoevenf62cde42014-05-01 20:40:54 +0200613 const void __user *usr_data, *usr_oob;
Brian Norrise99d8b02011-09-09 09:59:03 -0700614 int ret;
615
Geert Uytterhoevenf62cde42014-05-01 20:40:54 +0200616 if (copy_from_user(&req, argp, sizeof(req)))
Brian Norrise99d8b02011-09-09 09:59:03 -0700617 return -EFAULT;
Geert Uytterhoevenf62cde42014-05-01 20:40:54 +0200618
619 usr_data = (const void __user *)(uintptr_t)req.usr_data;
620 usr_oob = (const void __user *)(uintptr_t)req.usr_oob;
621 if (!access_ok(VERIFY_READ, usr_data, req.len) ||
622 !access_ok(VERIFY_READ, usr_oob, req.ooblen))
623 return -EFAULT;
624
Artem Bityutskiy3c3c10b2012-01-30 14:58:32 +0200625 if (!mtd->_write_oob)
Brian Norrise99d8b02011-09-09 09:59:03 -0700626 return -EOPNOTSUPP;
627
628 ops.mode = req.mode;
629 ops.len = (size_t)req.len;
630 ops.ooblen = (size_t)req.ooblen;
631 ops.ooboffs = 0;
632
Geert Uytterhoevenf62cde42014-05-01 20:40:54 +0200633 if (usr_data) {
Brian Norrise99d8b02011-09-09 09:59:03 -0700634 ops.datbuf = memdup_user(usr_data, ops.len);
635 if (IS_ERR(ops.datbuf))
636 return PTR_ERR(ops.datbuf);
637 } else {
638 ops.datbuf = NULL;
639 }
640
Geert Uytterhoevenf62cde42014-05-01 20:40:54 +0200641 if (usr_oob) {
Brian Norrise99d8b02011-09-09 09:59:03 -0700642 ops.oobbuf = memdup_user(usr_oob, ops.ooblen);
643 if (IS_ERR(ops.oobbuf)) {
644 kfree(ops.datbuf);
645 return PTR_ERR(ops.oobbuf);
646 }
647 } else {
648 ops.oobbuf = NULL;
649 }
650
Artem Bityutskiya2cc5ba2011-12-23 18:29:55 +0200651 ret = mtd_write_oob(mtd, (loff_t)req.start, &ops);
Brian Norrise99d8b02011-09-09 09:59:03 -0700652
653 kfree(ops.datbuf);
654 kfree(ops.oobbuf);
655
656 return ret;
657}
658
Artem Bityutskiy969e57a2011-12-23 17:27:46 +0200659static int mtdchar_ioctl(struct file *file, u_int cmd, u_long arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700660{
Thomas Gleixnerf1a28c02006-05-30 00:37:34 +0200661 struct mtd_file_info *mfi = file->private_data;
662 struct mtd_info *mtd = mfi->mtd;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700663 void __user *argp = (void __user *)arg;
664 int ret = 0;
665 u_long size;
Joern Engel73c619e2006-05-30 14:25:35 +0200666 struct mtd_info_user info;
Thomas Gleixner97894cd2005-11-07 11:15:26 +0000667
Brian Norris289c0522011-07-19 10:06:09 -0700668 pr_debug("MTD_ioctl\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700669
670 size = (cmd & IOCSIZE_MASK) >> IOCSIZE_SHIFT;
671 if (cmd & IOC_IN) {
672 if (!access_ok(VERIFY_READ, argp, size))
673 return -EFAULT;
674 }
675 if (cmd & IOC_OUT) {
676 if (!access_ok(VERIFY_WRITE, argp, size))
677 return -EFAULT;
678 }
Thomas Gleixner97894cd2005-11-07 11:15:26 +0000679
Linus Torvalds1da177e2005-04-16 15:20:36 -0700680 switch (cmd) {
681 case MEMGETREGIONCOUNT:
682 if (copy_to_user(argp, &(mtd->numeraseregions), sizeof(int)))
683 return -EFAULT;
684 break;
685
686 case MEMGETREGIONINFO:
687 {
Zev Weissb67c5f82008-09-01 05:02:12 -0700688 uint32_t ur_idx;
689 struct mtd_erase_region_info *kr;
H Hartley Sweetenbcc98a42010-01-15 11:25:38 -0700690 struct region_info_user __user *ur = argp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700691
Zev Weissb67c5f82008-09-01 05:02:12 -0700692 if (get_user(ur_idx, &(ur->regionindex)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700693 return -EFAULT;
694
Dan Carpenter5e59be12010-09-08 21:39:56 +0200695 if (ur_idx >= mtd->numeraseregions)
696 return -EINVAL;
697
Zev Weissb67c5f82008-09-01 05:02:12 -0700698 kr = &(mtd->eraseregions[ur_idx]);
699
700 if (put_user(kr->offset, &(ur->offset))
701 || put_user(kr->erasesize, &(ur->erasesize))
702 || put_user(kr->numblocks, &(ur->numblocks)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700703 return -EFAULT;
Zev Weissb67c5f82008-09-01 05:02:12 -0700704
Linus Torvalds1da177e2005-04-16 15:20:36 -0700705 break;
706 }
707
708 case MEMGETINFO:
Vasiliy Kulikova0c5a392010-11-06 17:41:24 +0300709 memset(&info, 0, sizeof(info));
Joern Engel73c619e2006-05-30 14:25:35 +0200710 info.type = mtd->type;
711 info.flags = mtd->flags;
712 info.size = mtd->size;
713 info.erasesize = mtd->erasesize;
714 info.writesize = mtd->writesize;
715 info.oobsize = mtd->oobsize;
Brian Norris19fb4342011-08-30 18:45:46 -0700716 /* The below field is obsolete */
717 info.padding = 0;
Joern Engel73c619e2006-05-30 14:25:35 +0200718 if (copy_to_user(argp, &info, sizeof(struct mtd_info_user)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700719 return -EFAULT;
720 break;
721
722 case MEMERASE:
Kevin Cernekee0dc54e92009-04-08 22:52:28 -0700723 case MEMERASE64:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700724 {
725 struct erase_info *erase;
726
Al Viroaeb5d722008-09-02 15:28:45 -0400727 if(!(file->f_mode & FMODE_WRITE))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700728 return -EPERM;
729
Burman Yan95b93a02006-11-15 21:10:29 +0200730 erase=kzalloc(sizeof(struct erase_info),GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700731 if (!erase)
732 ret = -ENOMEM;
733 else {
734 wait_queue_head_t waitq;
735 DECLARE_WAITQUEUE(wait, current);
736
737 init_waitqueue_head(&waitq);
738
Kevin Cernekee0dc54e92009-04-08 22:52:28 -0700739 if (cmd == MEMERASE64) {
740 struct erase_info_user64 einfo64;
741
742 if (copy_from_user(&einfo64, argp,
743 sizeof(struct erase_info_user64))) {
744 kfree(erase);
745 return -EFAULT;
746 }
747 erase->addr = einfo64.start;
748 erase->len = einfo64.length;
749 } else {
750 struct erase_info_user einfo32;
751
752 if (copy_from_user(&einfo32, argp,
753 sizeof(struct erase_info_user))) {
754 kfree(erase);
755 return -EFAULT;
756 }
757 erase->addr = einfo32.start;
758 erase->len = einfo32.length;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700759 }
760 erase->mtd = mtd;
761 erase->callback = mtdchar_erase_callback;
762 erase->priv = (unsigned long)&waitq;
Thomas Gleixner97894cd2005-11-07 11:15:26 +0000763
Linus Torvalds1da177e2005-04-16 15:20:36 -0700764 /*
765 FIXME: Allow INTERRUPTIBLE. Which means
766 not having the wait_queue head on the stack.
Thomas Gleixner97894cd2005-11-07 11:15:26 +0000767
Linus Torvalds1da177e2005-04-16 15:20:36 -0700768 If the wq_head is on the stack, and we
769 leave because we got interrupted, then the
770 wq_head is no longer there when the
771 callback routine tries to wake us up.
772 */
Artem Bityutskiy7e1f0dc2011-12-23 15:25:39 +0200773 ret = mtd_erase(mtd, erase);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700774 if (!ret) {
775 set_current_state(TASK_UNINTERRUPTIBLE);
776 add_wait_queue(&waitq, &wait);
777 if (erase->state != MTD_ERASE_DONE &&
778 erase->state != MTD_ERASE_FAILED)
779 schedule();
780 remove_wait_queue(&waitq, &wait);
781 set_current_state(TASK_RUNNING);
782
783 ret = (erase->state == MTD_ERASE_FAILED)?-EIO:0;
784 }
785 kfree(erase);
786 }
787 break;
788 }
789
790 case MEMWRITEOOB:
791 {
792 struct mtd_oob_buf buf;
Kevin Cernekee97718542009-04-08 22:53:13 -0700793 struct mtd_oob_buf __user *buf_user = argp;
Thomas Gleixner97894cd2005-11-07 11:15:26 +0000794
Kevin Cernekee97718542009-04-08 22:53:13 -0700795 /* NOTE: writes return length to buf_user->length */
796 if (copy_from_user(&buf, argp, sizeof(buf)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700797 ret = -EFAULT;
Kevin Cernekee97718542009-04-08 22:53:13 -0700798 else
Artem Bityutskiy969e57a2011-12-23 17:27:46 +0200799 ret = mtdchar_writeoob(file, mtd, buf.start, buf.length,
Kevin Cernekee97718542009-04-08 22:53:13 -0700800 buf.ptr, &buf_user->length);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700801 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700802 }
803
804 case MEMREADOOB:
805 {
806 struct mtd_oob_buf buf;
Kevin Cernekee97718542009-04-08 22:53:13 -0700807 struct mtd_oob_buf __user *buf_user = argp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700808
Kevin Cernekee97718542009-04-08 22:53:13 -0700809 /* NOTE: writes return length to buf_user->start */
810 if (copy_from_user(&buf, argp, sizeof(buf)))
811 ret = -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700812 else
Artem Bityutskiy969e57a2011-12-23 17:27:46 +0200813 ret = mtdchar_readoob(file, mtd, buf.start, buf.length,
Kevin Cernekee97718542009-04-08 22:53:13 -0700814 buf.ptr, &buf_user->start);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700815 break;
816 }
817
Kevin Cernekeeaea7cea2009-04-08 22:53:49 -0700818 case MEMWRITEOOB64:
819 {
820 struct mtd_oob_buf64 buf;
821 struct mtd_oob_buf64 __user *buf_user = argp;
822
823 if (copy_from_user(&buf, argp, sizeof(buf)))
824 ret = -EFAULT;
825 else
Artem Bityutskiy969e57a2011-12-23 17:27:46 +0200826 ret = mtdchar_writeoob(file, mtd, buf.start, buf.length,
Kevin Cernekeeaea7cea2009-04-08 22:53:49 -0700827 (void __user *)(uintptr_t)buf.usr_ptr,
828 &buf_user->length);
829 break;
830 }
831
832 case MEMREADOOB64:
833 {
834 struct mtd_oob_buf64 buf;
835 struct mtd_oob_buf64 __user *buf_user = argp;
836
837 if (copy_from_user(&buf, argp, sizeof(buf)))
838 ret = -EFAULT;
839 else
Artem Bityutskiy969e57a2011-12-23 17:27:46 +0200840 ret = mtdchar_readoob(file, mtd, buf.start, buf.length,
Kevin Cernekeeaea7cea2009-04-08 22:53:49 -0700841 (void __user *)(uintptr_t)buf.usr_ptr,
842 &buf_user->length);
843 break;
844 }
845
Brian Norrise99d8b02011-09-09 09:59:03 -0700846 case MEMWRITE:
847 {
Artem Bityutskiy969e57a2011-12-23 17:27:46 +0200848 ret = mtdchar_write_ioctl(mtd,
Brian Norrise99d8b02011-09-09 09:59:03 -0700849 (struct mtd_write_req __user *)arg);
850 break;
851 }
852
Linus Torvalds1da177e2005-04-16 15:20:36 -0700853 case MEMLOCK:
854 {
Harvey Harrison175428b2008-07-03 23:40:14 -0700855 struct erase_info_user einfo;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700856
Harvey Harrison175428b2008-07-03 23:40:14 -0700857 if (copy_from_user(&einfo, argp, sizeof(einfo)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700858 return -EFAULT;
859
Artem Bityutskiy38134562011-12-30 17:00:35 +0200860 ret = mtd_lock(mtd, einfo.start, einfo.length);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700861 break;
862 }
863
864 case MEMUNLOCK:
865 {
Harvey Harrison175428b2008-07-03 23:40:14 -0700866 struct erase_info_user einfo;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700867
Harvey Harrison175428b2008-07-03 23:40:14 -0700868 if (copy_from_user(&einfo, argp, sizeof(einfo)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700869 return -EFAULT;
870
Artem Bityutskiy38134562011-12-30 17:00:35 +0200871 ret = mtd_unlock(mtd, einfo.start, einfo.length);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700872 break;
873 }
874
Richard Cochran99384242010-06-14 18:10:33 +0200875 case MEMISLOCKED:
876 {
877 struct erase_info_user einfo;
878
879 if (copy_from_user(&einfo, argp, sizeof(einfo)))
880 return -EFAULT;
881
Artem Bityutskiy38134562011-12-30 17:00:35 +0200882 ret = mtd_is_locked(mtd, einfo.start, einfo.length);
Richard Cochran99384242010-06-14 18:10:33 +0200883 break;
884 }
885
Thomas Gleixner5bd34c02006-05-27 22:16:10 +0200886 /* Legacy interface */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700887 case MEMGETOOBSEL:
888 {
Thomas Gleixner5bd34c02006-05-27 22:16:10 +0200889 struct nand_oobinfo oi;
890
Boris Brezillonadbbc3b2016-02-03 19:01:31 +0100891 if (!mtd->ooblayout)
Thomas Gleixner5bd34c02006-05-27 22:16:10 +0200892 return -EOPNOTSUPP;
Thomas Gleixner5bd34c02006-05-27 22:16:10 +0200893
Boris Brezillonc2b78452016-02-03 20:10:30 +0100894 ret = get_oobinfo(mtd, &oi);
895 if (ret)
896 return ret;
Thomas Gleixner5bd34c02006-05-27 22:16:10 +0200897
898 if (copy_to_user(argp, &oi, sizeof(struct nand_oobinfo)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700899 return -EFAULT;
900 break;
901 }
902
903 case MEMGETBADBLOCK:
904 {
905 loff_t offs;
Thomas Gleixner97894cd2005-11-07 11:15:26 +0000906
Linus Torvalds1da177e2005-04-16 15:20:36 -0700907 if (copy_from_user(&offs, argp, sizeof(loff_t)))
908 return -EFAULT;
Artem Bityutskiy8f461a72012-01-02 13:48:54 +0200909 return mtd_block_isbad(mtd, offs);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700910 break;
911 }
912
913 case MEMSETBADBLOCK:
914 {
915 loff_t offs;
916
917 if (copy_from_user(&offs, argp, sizeof(loff_t)))
918 return -EFAULT;
Artem Bityutskiy800ffd32012-01-02 13:59:12 +0200919 return mtd_block_markbad(mtd, offs);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700920 break;
921 }
922
Nicolas Pitre31f42332005-02-08 17:45:55 +0000923 case OTPSELECT:
924 {
925 int mode;
926 if (copy_from_user(&mode, argp, sizeof(int)))
927 return -EFAULT;
Thomas Gleixnerf1a28c02006-05-30 00:37:34 +0200928
Brian Norrisbeb133f2011-08-30 18:45:41 -0700929 mfi->mode = MTD_FILE_MODE_NORMAL;
Thomas Gleixnerf1a28c02006-05-30 00:37:34 +0200930
931 ret = otp_select_filemode(mfi, mode);
932
Nicolas Pitre81dba482005-04-01 16:36:15 +0100933 file->f_pos = 0;
Nicolas Pitre31f42332005-02-08 17:45:55 +0000934 break;
935 }
936
937 case OTPGETREGIONCOUNT:
938 case OTPGETREGIONINFO:
939 {
940 struct otp_info *buf = kmalloc(4096, GFP_KERNEL);
Christian Riesch4b78fc42014-01-28 09:29:44 +0100941 size_t retlen;
Nicolas Pitre31f42332005-02-08 17:45:55 +0000942 if (!buf)
943 return -ENOMEM;
Thomas Gleixnerf1a28c02006-05-30 00:37:34 +0200944 switch (mfi->mode) {
Brian Norrisbeb133f2011-08-30 18:45:41 -0700945 case MTD_FILE_MODE_OTP_FACTORY:
Christian Riesch4b78fc42014-01-28 09:29:44 +0100946 ret = mtd_get_fact_prot_info(mtd, 4096, &retlen, buf);
Nicolas Pitre31f42332005-02-08 17:45:55 +0000947 break;
Brian Norrisbeb133f2011-08-30 18:45:41 -0700948 case MTD_FILE_MODE_OTP_USER:
Christian Riesch4b78fc42014-01-28 09:29:44 +0100949 ret = mtd_get_user_prot_info(mtd, 4096, &retlen, buf);
Nicolas Pitre31f42332005-02-08 17:45:55 +0000950 break;
Thomas Gleixnerf1a28c02006-05-30 00:37:34 +0200951 default:
Artem Bityutskiy87e858a92011-12-28 18:47:46 +0200952 ret = -EINVAL;
Thomas Gleixnerf1a28c02006-05-30 00:37:34 +0200953 break;
Nicolas Pitre31f42332005-02-08 17:45:55 +0000954 }
Christian Riesch4b78fc42014-01-28 09:29:44 +0100955 if (!ret) {
Nicolas Pitre31f42332005-02-08 17:45:55 +0000956 if (cmd == OTPGETREGIONCOUNT) {
Christian Riesch4b78fc42014-01-28 09:29:44 +0100957 int nbr = retlen / sizeof(struct otp_info);
Nicolas Pitre31f42332005-02-08 17:45:55 +0000958 ret = copy_to_user(argp, &nbr, sizeof(int));
959 } else
Christian Riesch4b78fc42014-01-28 09:29:44 +0100960 ret = copy_to_user(argp, buf, retlen);
Nicolas Pitre31f42332005-02-08 17:45:55 +0000961 if (ret)
962 ret = -EFAULT;
963 }
964 kfree(buf);
965 break;
966 }
967
968 case OTPLOCK:
969 {
Harvey Harrison175428b2008-07-03 23:40:14 -0700970 struct otp_info oinfo;
Nicolas Pitre31f42332005-02-08 17:45:55 +0000971
Brian Norrisbeb133f2011-08-30 18:45:41 -0700972 if (mfi->mode != MTD_FILE_MODE_OTP_USER)
Nicolas Pitre31f42332005-02-08 17:45:55 +0000973 return -EINVAL;
Harvey Harrison175428b2008-07-03 23:40:14 -0700974 if (copy_from_user(&oinfo, argp, sizeof(oinfo)))
Nicolas Pitre31f42332005-02-08 17:45:55 +0000975 return -EFAULT;
Artem Bityutskiy4403dbfb2011-12-23 18:55:49 +0200976 ret = mtd_lock_user_prot_reg(mtd, oinfo.start, oinfo.length);
Nicolas Pitre31f42332005-02-08 17:45:55 +0000977 break;
978 }
Nicolas Pitre31f42332005-02-08 17:45:55 +0000979
Brian Norris7854d3f2011-06-23 14:12:08 -0700980 /* This ioctl is being deprecated - it truncates the ECC layout */
Thomas Gleixnerf1a28c02006-05-30 00:37:34 +0200981 case ECCGETLAYOUT:
982 {
Brian Norriscc26c3c2010-08-24 18:12:00 -0700983 struct nand_ecclayout_user *usrlay;
984
Boris Brezillonadbbc3b2016-02-03 19:01:31 +0100985 if (!mtd->ooblayout)
Thomas Gleixnerf1a28c02006-05-30 00:37:34 +0200986 return -EOPNOTSUPP;
987
Brian Norriscc26c3c2010-08-24 18:12:00 -0700988 usrlay = kmalloc(sizeof(*usrlay), GFP_KERNEL);
989 if (!usrlay)
990 return -ENOMEM;
991
Boris Brezillonc2b78452016-02-03 20:10:30 +0100992 shrink_ecclayout(mtd, usrlay);
Brian Norriscc26c3c2010-08-24 18:12:00 -0700993
994 if (copy_to_user(argp, usrlay, sizeof(*usrlay)))
995 ret = -EFAULT;
996 kfree(usrlay);
Thomas Gleixnerf1a28c02006-05-30 00:37:34 +0200997 break;
998 }
999
1000 case ECCGETSTATS:
1001 {
1002 if (copy_to_user(argp, &mtd->ecc_stats,
1003 sizeof(struct mtd_ecc_stats)))
1004 return -EFAULT;
1005 break;
1006 }
1007
1008 case MTDFILEMODE:
1009 {
1010 mfi->mode = 0;
1011
1012 switch(arg) {
Brian Norrisbeb133f2011-08-30 18:45:41 -07001013 case MTD_FILE_MODE_OTP_FACTORY:
1014 case MTD_FILE_MODE_OTP_USER:
Thomas Gleixnerf1a28c02006-05-30 00:37:34 +02001015 ret = otp_select_filemode(mfi, arg);
1016 break;
1017
Brian Norrisbeb133f2011-08-30 18:45:41 -07001018 case MTD_FILE_MODE_RAW:
Artem Bityutskiyfc002e32011-12-28 18:35:07 +02001019 if (!mtd_has_oob(mtd))
Thomas Gleixnerf1a28c02006-05-30 00:37:34 +02001020 return -EOPNOTSUPP;
1021 mfi->mode = arg;
1022
Brian Norrisbeb133f2011-08-30 18:45:41 -07001023 case MTD_FILE_MODE_NORMAL:
Thomas Gleixnerf1a28c02006-05-30 00:37:34 +02001024 break;
1025 default:
1026 ret = -EINVAL;
1027 }
1028 file->f_pos = 0;
1029 break;
1030 }
1031
Roman Tereshonkovd0f79592010-09-17 13:31:42 +03001032 case BLKPG:
1033 {
Brian Norris53bb7242015-09-21 13:26:59 -07001034 struct blkpg_ioctl_arg __user *blk_arg = argp;
1035 struct blkpg_ioctl_arg a;
1036
1037 if (copy_from_user(&a, blk_arg, sizeof(a)))
1038 ret = -EFAULT;
1039 else
1040 ret = mtdchar_blkpg_ioctl(mtd, &a);
Roman Tereshonkovd0f79592010-09-17 13:31:42 +03001041 break;
1042 }
1043
1044 case BLKRRPART:
1045 {
1046 /* No reread partition feature. Just return ok */
1047 ret = 0;
1048 break;
1049 }
Roman Tereshonkovd0f79592010-09-17 13:31:42 +03001050
Linus Torvalds1da177e2005-04-16 15:20:36 -07001051 default:
1052 ret = -ENOTTY;
1053 }
1054
1055 return ret;
1056} /* memory_ioctl */
1057
Artem Bityutskiy969e57a2011-12-23 17:27:46 +02001058static long mtdchar_unlocked_ioctl(struct file *file, u_int cmd, u_long arg)
Arnd Bergmann55929332010-04-27 00:24:05 +02001059{
1060 int ret;
1061
Arnd Bergmann5aa82942010-06-02 14:28:52 +02001062 mutex_lock(&mtd_mutex);
Artem Bityutskiy969e57a2011-12-23 17:27:46 +02001063 ret = mtdchar_ioctl(file, cmd, arg);
Arnd Bergmann5aa82942010-06-02 14:28:52 +02001064 mutex_unlock(&mtd_mutex);
Arnd Bergmann55929332010-04-27 00:24:05 +02001065
1066 return ret;
1067}
1068
Kevin Cernekee97718542009-04-08 22:53:13 -07001069#ifdef CONFIG_COMPAT
1070
1071struct mtd_oob_buf32 {
1072 u_int32_t start;
1073 u_int32_t length;
1074 compat_caddr_t ptr; /* unsigned char* */
1075};
1076
1077#define MEMWRITEOOB32 _IOWR('M', 3, struct mtd_oob_buf32)
1078#define MEMREADOOB32 _IOWR('M', 4, struct mtd_oob_buf32)
1079
Artem Bityutskiy969e57a2011-12-23 17:27:46 +02001080static long mtdchar_compat_ioctl(struct file *file, unsigned int cmd,
Kevin Cernekee97718542009-04-08 22:53:13 -07001081 unsigned long arg)
1082{
1083 struct mtd_file_info *mfi = file->private_data;
1084 struct mtd_info *mtd = mfi->mtd;
David Woodhouse0b6585c2009-05-29 16:09:08 +01001085 void __user *argp = compat_ptr(arg);
Kevin Cernekee97718542009-04-08 22:53:13 -07001086 int ret = 0;
1087
Arnd Bergmann5aa82942010-06-02 14:28:52 +02001088 mutex_lock(&mtd_mutex);
Kevin Cernekee97718542009-04-08 22:53:13 -07001089
1090 switch (cmd) {
1091 case MEMWRITEOOB32:
1092 {
1093 struct mtd_oob_buf32 buf;
1094 struct mtd_oob_buf32 __user *buf_user = argp;
1095
1096 if (copy_from_user(&buf, argp, sizeof(buf)))
1097 ret = -EFAULT;
1098 else
Artem Bityutskiy969e57a2011-12-23 17:27:46 +02001099 ret = mtdchar_writeoob(file, mtd, buf.start,
Kevin Cernekee97718542009-04-08 22:53:13 -07001100 buf.length, compat_ptr(buf.ptr),
1101 &buf_user->length);
1102 break;
1103 }
1104
1105 case MEMREADOOB32:
1106 {
1107 struct mtd_oob_buf32 buf;
1108 struct mtd_oob_buf32 __user *buf_user = argp;
1109
1110 /* NOTE: writes return length to buf->start */
1111 if (copy_from_user(&buf, argp, sizeof(buf)))
1112 ret = -EFAULT;
1113 else
Artem Bityutskiy969e57a2011-12-23 17:27:46 +02001114 ret = mtdchar_readoob(file, mtd, buf.start,
Kevin Cernekee97718542009-04-08 22:53:13 -07001115 buf.length, compat_ptr(buf.ptr),
1116 &buf_user->start);
1117 break;
1118 }
Brian Norris53bb7242015-09-21 13:26:59 -07001119
1120 case BLKPG:
1121 {
1122 /* Convert from blkpg_compat_ioctl_arg to blkpg_ioctl_arg */
1123 struct blkpg_compat_ioctl_arg __user *uarg = argp;
1124 struct blkpg_compat_ioctl_arg compat_arg;
1125 struct blkpg_ioctl_arg a;
1126
1127 if (copy_from_user(&compat_arg, uarg, sizeof(compat_arg))) {
1128 ret = -EFAULT;
1129 break;
1130 }
1131
1132 memset(&a, 0, sizeof(a));
1133 a.op = compat_arg.op;
1134 a.flags = compat_arg.flags;
1135 a.datalen = compat_arg.datalen;
1136 a.data = compat_ptr(compat_arg.data);
1137
1138 ret = mtdchar_blkpg_ioctl(mtd, &a);
1139 break;
1140 }
1141
Kevin Cernekee97718542009-04-08 22:53:13 -07001142 default:
Artem Bityutskiy969e57a2011-12-23 17:27:46 +02001143 ret = mtdchar_ioctl(file, cmd, (unsigned long)argp);
Kevin Cernekee97718542009-04-08 22:53:13 -07001144 }
1145
Arnd Bergmann5aa82942010-06-02 14:28:52 +02001146 mutex_unlock(&mtd_mutex);
Kevin Cernekee97718542009-04-08 22:53:13 -07001147
1148 return ret;
1149}
1150
1151#endif /* CONFIG_COMPAT */
1152
David Howells402d3262009-02-12 10:40:00 +00001153/*
1154 * try to determine where a shared mapping can be made
1155 * - only supported for NOMMU at the moment (MMU can't doesn't copy private
1156 * mappings)
1157 */
1158#ifndef CONFIG_MMU
Artem Bityutskiy969e57a2011-12-23 17:27:46 +02001159static unsigned long mtdchar_get_unmapped_area(struct file *file,
David Howells402d3262009-02-12 10:40:00 +00001160 unsigned long addr,
1161 unsigned long len,
1162 unsigned long pgoff,
1163 unsigned long flags)
1164{
1165 struct mtd_file_info *mfi = file->private_data;
1166 struct mtd_info *mtd = mfi->mtd;
Artem Bityutskiycd621272011-12-30 14:31:57 +02001167 unsigned long offset;
1168 int ret;
David Howells402d3262009-02-12 10:40:00 +00001169
Artem Bityutskiycd621272011-12-30 14:31:57 +02001170 if (addr != 0)
1171 return (unsigned long) -EINVAL;
David Howells402d3262009-02-12 10:40:00 +00001172
Artem Bityutskiycd621272011-12-30 14:31:57 +02001173 if (len > mtd->size || pgoff >= (mtd->size >> PAGE_SHIFT))
1174 return (unsigned long) -EINVAL;
David Howells402d3262009-02-12 10:40:00 +00001175
Artem Bityutskiycd621272011-12-30 14:31:57 +02001176 offset = pgoff << PAGE_SHIFT;
1177 if (offset > mtd->size - len)
1178 return (unsigned long) -EINVAL;
David Howells402d3262009-02-12 10:40:00 +00001179
Artem Bityutskiycd621272011-12-30 14:31:57 +02001180 ret = mtd_get_unmapped_area(mtd, len, offset, flags);
Vladimir Zapolskiyb9995932013-10-28 18:08:15 +02001181 return ret == -EOPNOTSUPP ? -ENODEV : ret;
David Howells402d3262009-02-12 10:40:00 +00001182}
Christoph Hellwigb4caecd2015-01-14 10:42:32 +01001183
1184static unsigned mtdchar_mmap_capabilities(struct file *file)
1185{
1186 struct mtd_file_info *mfi = file->private_data;
1187
1188 return mtd_mmap_capabilities(mfi->mtd);
1189}
David Howells402d3262009-02-12 10:40:00 +00001190#endif
1191
1192/*
1193 * set up a mapping for shared memory segments
1194 */
Artem Bityutskiy969e57a2011-12-23 17:27:46 +02001195static int mtdchar_mmap(struct file *file, struct vm_area_struct *vma)
David Howells402d3262009-02-12 10:40:00 +00001196{
1197#ifdef CONFIG_MMU
1198 struct mtd_file_info *mfi = file->private_data;
1199 struct mtd_info *mtd = mfi->mtd;
Anatolij Gustschindd02b672010-06-15 09:30:15 +02001200 struct map_info *map = mtd->priv;
David Howells402d3262009-02-12 10:40:00 +00001201
David Woodhousef5cf8f02012-10-09 15:08:10 +01001202 /* This is broken because it assumes the MTD device is map-based
1203 and that mtd->priv is a valid struct map_info. It should be
1204 replaced with something that uses the mtd_get_unmapped_area()
1205 operation properly. */
1206 if (0 /*mtd->type == MTD_RAM || mtd->type == MTD_ROM*/) {
Anatolij Gustschindd02b672010-06-15 09:30:15 +02001207#ifdef pgprot_noncached
Linus Torvalds8558e4a2013-04-19 09:53:07 -07001208 if (file->f_flags & O_DSYNC || map->phys >= __pa(high_memory))
Anatolij Gustschindd02b672010-06-15 09:30:15 +02001209 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
1210#endif
Linus Torvalds8558e4a2013-04-19 09:53:07 -07001211 return vm_iomap_memory(vma, map->phys, map->size);
Anatolij Gustschindd02b672010-06-15 09:30:15 +02001212 }
Vladimir Zapolskiyb9995932013-10-28 18:08:15 +02001213 return -ENODEV;
David Howells402d3262009-02-12 10:40:00 +00001214#else
Vladimir Zapolskiyb9995932013-10-28 18:08:15 +02001215 return vma->vm_flags & VM_SHARED ? 0 : -EACCES;
David Howells402d3262009-02-12 10:40:00 +00001216#endif
1217}
1218
Arjan van de Vend54b1fd2007-02-12 00:55:34 -08001219static const struct file_operations mtd_fops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001220 .owner = THIS_MODULE,
Artem Bityutskiy969e57a2011-12-23 17:27:46 +02001221 .llseek = mtdchar_lseek,
1222 .read = mtdchar_read,
1223 .write = mtdchar_write,
1224 .unlocked_ioctl = mtdchar_unlocked_ioctl,
Kevin Cernekee97718542009-04-08 22:53:13 -07001225#ifdef CONFIG_COMPAT
Artem Bityutskiy969e57a2011-12-23 17:27:46 +02001226 .compat_ioctl = mtdchar_compat_ioctl,
Kevin Cernekee97718542009-04-08 22:53:13 -07001227#endif
Artem Bityutskiy969e57a2011-12-23 17:27:46 +02001228 .open = mtdchar_open,
1229 .release = mtdchar_close,
1230 .mmap = mtdchar_mmap,
David Howells402d3262009-02-12 10:40:00 +00001231#ifndef CONFIG_MMU
Artem Bityutskiy969e57a2011-12-23 17:27:46 +02001232 .get_unmapped_area = mtdchar_get_unmapped_area,
Christoph Hellwigb4caecd2015-01-14 10:42:32 +01001233 .mmap_capabilities = mtdchar_mmap_capabilities,
David Howells402d3262009-02-12 10:40:00 +00001234#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001235};
1236
Artem Bityutskiy660685d2013-03-14 13:27:40 +02001237int __init init_mtdchar(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001238{
Kirill A. Shutemovcd874232010-05-17 16:55:47 +03001239 int ret;
David Brownell1f24b5a2009-03-26 00:42:41 -07001240
Kirill A. Shutemovcd874232010-05-17 16:55:47 +03001241 ret = __register_chrdev(MTD_CHAR_MAJOR, 0, 1 << MINORBITS,
Ben Hutchingsdad0db32010-01-29 21:00:04 +00001242 "mtd", &mtd_fops);
Kirill A. Shutemovcd874232010-05-17 16:55:47 +03001243 if (ret < 0) {
Artem Bityutskiy57ae2b62013-03-15 12:59:36 +02001244 pr_err("Can't allocate major number %d for MTD\n",
1245 MTD_CHAR_MAJOR);
Kirill A. Shutemovcd874232010-05-17 16:55:47 +03001246 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001247 }
1248
Kirill A. Shutemovcd874232010-05-17 16:55:47 +03001249 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001250}
1251
Artem Bityutskiy660685d2013-03-14 13:27:40 +02001252void __exit cleanup_mtdchar(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001253{
Ben Hutchingsdad0db32010-01-29 21:00:04 +00001254 __unregister_chrdev(MTD_CHAR_MAJOR, 0, 1 << MINORBITS, "mtd");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001255}
1256
Scott James Remnant90160e12009-03-02 18:42:39 +00001257MODULE_ALIAS_CHARDEV_MAJOR(MTD_CHAR_MAJOR);