1/* 2 * 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 17 * 18 */ 19 20#include <linux/device.h> 21#include <linux/fs.h> 22#include <linux/mm.h> 23#include <linux/err.h> 24#include <linux/init.h> 25#include <linux/kernel.h> 26#include <linux/module.h> 27#include <linux/slab.h> 28#include <linux/sched.h> 29#include <linux/mutex.h> 30#include <linux/backing-dev.h> 31#include <linux/compat.h> 32#include <linux/mount.h> 33#include <linux/blkpg.h> 34#include <linux/magic.h> 35#include <linux/major.h> 36#include <linux/mtd/mtd.h> 37#include <linux/mtd/partitions.h> 38#include <linux/mtd/map.h> 39 40#include <asm/uaccess.h> 41 42#include "mtdcore.h" 43 44static DEFINE_MUTEX(mtd_mutex); 45 46/* 47 * Data structure to hold the pointer to the mtd device as well 48 * as mode information of various use cases. 49 */ 50struct mtd_file_info { 51 struct mtd_info *mtd; 52 struct inode *ino; 53 enum mtd_file_modes mode; 54}; 55 56static loff_t mtdchar_lseek(struct file *file, loff_t offset, int orig) 57{ 58 struct mtd_file_info *mfi = file->private_data; 59 return fixed_size_llseek(file, offset, orig, mfi->mtd->size); 60} 61 62static int count; 63static struct vfsmount *mnt; 64static struct file_system_type mtd_inodefs_type; 65 66static int mtdchar_open(struct inode *inode, struct file *file) 67{ 68 int minor = iminor(inode); 69 int devnum = minor >> 1; 70 int ret = 0; 71 struct mtd_info *mtd; 72 struct mtd_file_info *mfi; 73 struct inode *mtd_ino; 74 75 pr_debug("MTD_open\n"); 76 77 /* You can't open the RO devices RW */ 78 if ((file->f_mode & FMODE_WRITE) && (minor & 1)) 79 return -EACCES; 80 81 ret = simple_pin_fs(&mtd_inodefs_type, &mnt, &count); 82 if (ret) 83 return ret; 84 85 mutex_lock(&mtd_mutex); 86 mtd = get_mtd_device(NULL, devnum); 87 88 if (IS_ERR(mtd)) { 89 ret = PTR_ERR(mtd); 90 goto out; 91 } 92 93 if (mtd->type == MTD_ABSENT) { 94 ret = -ENODEV; 95 goto out1; 96 } 97 98 mtd_ino = iget_locked(mnt->mnt_sb, devnum); 99 if (!mtd_ino) { 100 ret = -ENOMEM; 101 goto out1; 102 } 103 if (mtd_ino->i_state & I_NEW) { 104 mtd_ino->i_private = mtd; 105 mtd_ino->i_mode = S_IFCHR; 106 mtd_ino->i_data.backing_dev_info = mtd->backing_dev_info; 107 unlock_new_inode(mtd_ino); 108 } 109 file->f_mapping = mtd_ino->i_mapping; 110 111 /* You can't open it RW if it's not a writeable device */ 112 if ((file->f_mode & FMODE_WRITE) && !(mtd->flags & MTD_WRITEABLE)) { 113 ret = -EACCES; 114 goto out2; 115 } 116 117 mfi = kzalloc(sizeof(*mfi), GFP_KERNEL); 118 if (!mfi) { 119 ret = -ENOMEM; 120 goto out2; 121 } 122 mfi->ino = mtd_ino; 123 mfi->mtd = mtd; 124 file->private_data = mfi; 125 mutex_unlock(&mtd_mutex); 126 return 0; 127 128out2: 129 iput(mtd_ino); 130out1: 131 put_mtd_device(mtd); 132out: 133 mutex_unlock(&mtd_mutex); 134 simple_release_fs(&mnt, &count); 135 return ret; 136} /* mtdchar_open */ 137 138/*====================================================================*/ 139 140static int mtdchar_close(struct inode *inode, struct file *file) 141{ 142 struct mtd_file_info *mfi = file->private_data; 143 struct mtd_info *mtd = mfi->mtd; 144 145 pr_debug("MTD_close\n"); 146 147 /* Only sync if opened RW */ 148 if ((file->f_mode & FMODE_WRITE)) 149 mtd_sync(mtd); 150 151 iput(mfi->ino); 152 153 put_mtd_device(mtd); 154 file->private_data = NULL; 155 kfree(mfi); 156 simple_release_fs(&mnt, &count); 157 158 return 0; 159} /* mtdchar_close */ 160 161/* Back in June 2001, dwmw2 wrote: 162 * 163 * FIXME: This _really_ needs to die. In 2.5, we should lock the 164 * userspace buffer down and use it directly with readv/writev. 165 * 166 * The implementation below, using mtd_kmalloc_up_to, mitigates 167 * allocation failures when the system is under low-memory situations 168 * or if memory is highly fragmented at the cost of reducing the 169 * performance of the requested transfer due to a smaller buffer size. 170 * 171 * A more complex but more memory-efficient implementation based on 172 * get_user_pages and iovecs to cover extents of those pages is a 173 * longer-term goal, as intimated by dwmw2 above. However, for the 174 * write case, this requires yet more complex head and tail transfer 175 * handling when those head and tail offsets and sizes are such that 176 * alignment requirements are not met in the NAND subdriver. 177 */ 178 179static ssize_t mtdchar_read(struct file *file, char __user *buf, size_t count, 180 loff_t *ppos) 181{ 182 struct mtd_file_info *mfi = file->private_data; 183 struct mtd_info *mtd = mfi->mtd; 184 size_t retlen; 185 size_t total_retlen=0; 186 int ret=0; 187 int len; 188 size_t size = count; 189 char *kbuf; 190 191 pr_debug("MTD_read\n"); 192 193 if (*ppos + count > mtd->size) 194 count = mtd->size - *ppos; 195 196 if (!count) 197 return 0; 198 199 kbuf = mtd_kmalloc_up_to(mtd, &size); 200 if (!kbuf) 201 return -ENOMEM; 202 203 while (count) { 204 len = min_t(size_t, count, size); 205 206 switch (mfi->mode) { 207 case MTD_FILE_MODE_OTP_FACTORY: 208 ret = mtd_read_fact_prot_reg(mtd, *ppos, len, 209 &retlen, kbuf); 210 break; 211 case MTD_FILE_MODE_OTP_USER: 212 ret = mtd_read_user_prot_reg(mtd, *ppos, len, 213 &retlen, kbuf); 214 break; 215 case MTD_FILE_MODE_RAW: 216 { 217 struct mtd_oob_ops ops; 218 219 ops.mode = MTD_OPS_RAW; 220 ops.datbuf = kbuf; 221 ops.oobbuf = NULL; 222 ops.len = len; 223 224 ret = mtd_read_oob(mtd, *ppos, &ops); 225 retlen = ops.retlen; 226 break; 227 } 228 default: 229 ret = mtd_read(mtd, *ppos, len, &retlen, kbuf); 230 } 231 /* Nand returns -EBADMSG on ECC errors, but it returns 232 * the data. For our userspace tools it is important 233 * to dump areas with ECC errors! 234 * For kernel internal usage it also might return -EUCLEAN 235 * to signal the caller that a bitflip has occurred and has 236 * been corrected by the ECC algorithm. 237 * Userspace software which accesses NAND this way 238 * must be aware of the fact that it deals with NAND 239 */ 240 if (!ret || mtd_is_bitflip_or_eccerr(ret)) { 241 *ppos += retlen; 242 if (copy_to_user(buf, kbuf, retlen)) { 243 kfree(kbuf); 244 return -EFAULT; 245 } 246 else 247 total_retlen += retlen; 248 249 count -= retlen; 250 buf += retlen; 251 if (retlen == 0) 252 count = 0; 253 } 254 else { 255 kfree(kbuf); 256 return ret; 257 } 258 259 } 260 261 kfree(kbuf); 262 return total_retlen; 263} /* mtdchar_read */ 264 265static ssize_t mtdchar_write(struct file *file, const char __user *buf, size_t count, 266 loff_t *ppos) 267{ 268 struct mtd_file_info *mfi = file->private_data; 269 struct mtd_info *mtd = mfi->mtd; 270 size_t size = count; 271 char *kbuf; 272 size_t retlen; 273 size_t total_retlen=0; 274 int ret=0; 275 int len; 276 277 pr_debug("MTD_write\n"); 278 279 if (*ppos == mtd->size) 280 return -ENOSPC; 281 282 if (*ppos + count > mtd->size) 283 count = mtd->size - *ppos; 284 285 if (!count) 286 return 0; 287 288 kbuf = mtd_kmalloc_up_to(mtd, &size); 289 if (!kbuf) 290 return -ENOMEM; 291 292 while (count) { 293 len = min_t(size_t, count, size); 294 295 if (copy_from_user(kbuf, buf, len)) { 296 kfree(kbuf); 297 return -EFAULT; 298 } 299 300 switch (mfi->mode) { 301 case MTD_FILE_MODE_OTP_FACTORY: 302 ret = -EROFS; 303 break; 304 case MTD_FILE_MODE_OTP_USER: 305 ret = mtd_write_user_prot_reg(mtd, *ppos, len, 306 &retlen, kbuf); 307 break; 308 309 case MTD_FILE_MODE_RAW: 310 { 311 struct mtd_oob_ops ops; 312 313 ops.mode = MTD_OPS_RAW; 314 ops.datbuf = kbuf; 315 ops.oobbuf = NULL; 316 ops.ooboffs = 0; 317 ops.len = len; 318 319 ret = mtd_write_oob(mtd, *ppos, &ops); 320 retlen = ops.retlen; 321 break; 322 } 323 324 default: 325 ret = mtd_write(mtd, *ppos, len, &retlen, kbuf); 326 } 327 328 /* 329 * Return -ENOSPC only if no data could be written at all. 330 * Otherwise just return the number of bytes that actually 331 * have been written. 332 */ 333 if ((ret == -ENOSPC) && (total_retlen)) 334 break; 335 336 if (!ret) { 337 *ppos += retlen; 338 total_retlen += retlen; 339 count -= retlen; 340 buf += retlen; 341 } 342 else { 343 kfree(kbuf); 344 return ret; 345 } 346 } 347 348 kfree(kbuf); 349 return total_retlen; 350} /* mtdchar_write */ 351 352/*====================================================================== 353 354 IOCTL calls for getting device parameters. 355 356======================================================================*/ 357static void mtdchar_erase_callback (struct erase_info *instr) 358{ 359 wake_up((wait_queue_head_t *)instr->priv); 360} 361 362static int otp_select_filemode(struct mtd_file_info *mfi, int mode) 363{ 364 struct mtd_info *mtd = mfi->mtd; 365 size_t retlen; 366 367 switch (mode) { 368 case MTD_OTP_FACTORY: 369 if (mtd_read_fact_prot_reg(mtd, -1, 0, &retlen, NULL) == 370 -EOPNOTSUPP) 371 return -EOPNOTSUPP; 372 373 mfi->mode = MTD_FILE_MODE_OTP_FACTORY; 374 break; 375 case MTD_OTP_USER: 376 if (mtd_read_user_prot_reg(mtd, -1, 0, &retlen, NULL) == 377 -EOPNOTSUPP) 378 return -EOPNOTSUPP; 379 380 mfi->mode = MTD_FILE_MODE_OTP_USER; 381 break; 382 case MTD_OTP_OFF: 383 mfi->mode = MTD_FILE_MODE_NORMAL; 384 break; 385 default: 386 return -EINVAL; 387 } 388 389 return 0; 390} 391 392static int mtdchar_writeoob(struct file *file, struct mtd_info *mtd, 393 uint64_t start, uint32_t length, void __user *ptr, 394 uint32_t __user *retp) 395{ 396 struct mtd_file_info *mfi = file->private_data; 397 struct mtd_oob_ops ops; 398 uint32_t retlen; 399 int ret = 0; 400 401 if (!(file->f_mode & FMODE_WRITE)) 402 return -EPERM; 403 404 if (length > 4096) 405 return -EINVAL; 406 407 if (!mtd->_write_oob) 408 ret = -EOPNOTSUPP; 409 else 410 ret = access_ok(VERIFY_READ, ptr, length) ? 0 : -EFAULT; 411 412 if (ret) 413 return ret; 414 415 ops.ooblen = length; 416 ops.ooboffs = start & (mtd->writesize - 1); 417 ops.datbuf = NULL; 418 ops.mode = (mfi->mode == MTD_FILE_MODE_RAW) ? MTD_OPS_RAW : 419 MTD_OPS_PLACE_OOB; 420 421 if (ops.ooboffs && ops.ooblen > (mtd->oobsize - ops.ooboffs)) 422 return -EINVAL; 423 424 ops.oobbuf = memdup_user(ptr, length); 425 if (IS_ERR(ops.oobbuf)) 426 return PTR_ERR(ops.oobbuf); 427 428 start &= ~((uint64_t)mtd->writesize - 1); 429 ret = mtd_write_oob(mtd, start, &ops); 430 431 if (ops.oobretlen > 0xFFFFFFFFU) 432 ret = -EOVERFLOW; 433 retlen = ops.oobretlen; 434 if (copy_to_user(retp, &retlen, sizeof(length))) 435 ret = -EFAULT; 436 437 kfree(ops.oobbuf); 438 return ret; 439} 440 441static int mtdchar_readoob(struct file *file, struct mtd_info *mtd, 442 uint64_t start, uint32_t length, void __user *ptr, 443 uint32_t __user *retp) 444{ 445 struct mtd_file_info *mfi = file->private_data; 446 struct mtd_oob_ops ops; 447 int ret = 0; 448 449 if (length > 4096) 450 return -EINVAL; 451 452 if (!access_ok(VERIFY_WRITE, ptr, length)) 453 return -EFAULT; 454 455 ops.ooblen = length; 456 ops.ooboffs = start & (mtd->writesize - 1); 457 ops.datbuf = NULL; 458 ops.mode = (mfi->mode == MTD_FILE_MODE_RAW) ? MTD_OPS_RAW : 459 MTD_OPS_PLACE_OOB; 460 461 if (ops.ooboffs && ops.ooblen > (mtd->oobsize - ops.ooboffs)) 462 return -EINVAL; 463 464 ops.oobbuf = kmalloc(length, GFP_KERNEL); 465 if (!ops.oobbuf) 466 return -ENOMEM; 467 468 start &= ~((uint64_t)mtd->writesize - 1); 469 ret = mtd_read_oob(mtd, start, &ops); 470 471 if (put_user(ops.oobretlen, retp)) 472 ret = -EFAULT; 473 else if (ops.oobretlen && copy_to_user(ptr, ops.oobbuf, 474 ops.oobretlen)) 475 ret = -EFAULT; 476 477 kfree(ops.oobbuf); 478 479 /* 480 * NAND returns -EBADMSG on ECC errors, but it returns the OOB 481 * data. For our userspace tools it is important to dump areas 482 * with ECC errors! 483 * For kernel internal usage it also might return -EUCLEAN 484 * to signal the caller that a bitflip has occured and has 485 * been corrected by the ECC algorithm. 486 * 487 * Note: currently the standard NAND function, nand_read_oob_std, 488 * does not calculate ECC for the OOB area, so do not rely on 489 * this behavior unless you have replaced it with your own. 490 */ 491 if (mtd_is_bitflip_or_eccerr(ret)) 492 return 0; 493 494 return ret; 495} 496 497/* 498 * Copies (and truncates, if necessary) data from the larger struct, 499 * nand_ecclayout, to the smaller, deprecated layout struct, 500 * nand_ecclayout_user. This is necessary only to support the deprecated 501 * API ioctl ECCGETLAYOUT while allowing all new functionality to use 502 * nand_ecclayout flexibly (i.e. the struct may change size in new 503 * releases without requiring major rewrites). 504 */ 505static int shrink_ecclayout(const struct nand_ecclayout *from, 506 struct nand_ecclayout_user *to) 507{ 508 int i; 509 510 if (!from || !to) 511 return -EINVAL; 512 513 memset(to, 0, sizeof(*to)); 514 515 to->eccbytes = min((int)from->eccbytes, MTD_MAX_ECCPOS_ENTRIES); 516 for (i = 0; i < to->eccbytes; i++) 517 to->eccpos[i] = from->eccpos[i]; 518 519 for (i = 0; i < MTD_MAX_OOBFREE_ENTRIES; i++) { 520 if (from->oobfree[i].length == 0 && 521 from->oobfree[i].offset == 0) 522 break; 523 to->oobavail += from->oobfree[i].length; 524 to->oobfree[i] = from->oobfree[i]; 525 } 526 527 return 0; 528} 529 530static int mtdchar_blkpg_ioctl(struct mtd_info *mtd, 531 struct blkpg_ioctl_arg __user *arg) 532{ 533 struct blkpg_ioctl_arg a; 534 struct blkpg_partition p; 535 536 if (!capable(CAP_SYS_ADMIN)) 537 return -EPERM; 538 539 if (copy_from_user(&a, arg, sizeof(struct blkpg_ioctl_arg))) 540 return -EFAULT; 541 542 if (copy_from_user(&p, a.data, sizeof(struct blkpg_partition))) 543 return -EFAULT; 544 545 switch (a.op) { 546 case BLKPG_ADD_PARTITION: 547 548 /* Only master mtd device must be used to add partitions */ 549 if (mtd_is_partition(mtd)) 550 return -EINVAL; 551 552 /* Sanitize user input */ 553 p.devname[BLKPG_DEVNAMELTH - 1] = '\0'; 554 555 return mtd_add_partition(mtd, p.devname, p.start, p.length); 556 557 case BLKPG_DEL_PARTITION: 558 559 if (p.pno < 0) 560 return -EINVAL; 561 562 return mtd_del_partition(mtd, p.pno); 563 564 default: 565 return -EINVAL; 566 } 567} 568 569static int mtdchar_write_ioctl(struct mtd_info *mtd, 570 struct mtd_write_req __user *argp) 571{ 572 struct mtd_write_req req; 573 struct mtd_oob_ops ops; 574 const void __user *usr_data, *usr_oob; 575 int ret; 576 577 if (copy_from_user(&req, argp, sizeof(req))) 578 return -EFAULT; 579 580 usr_data = (const void __user *)(uintptr_t)req.usr_data; 581 usr_oob = (const void __user *)(uintptr_t)req.usr_oob; 582 if (!access_ok(VERIFY_READ, usr_data, req.len) || 583 !access_ok(VERIFY_READ, usr_oob, req.ooblen)) 584 return -EFAULT; 585 586 if (!mtd->_write_oob) 587 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 if (usr_data) { 595 ops.datbuf = memdup_user(usr_data, ops.len); 596 if (IS_ERR(ops.datbuf)) 597 return PTR_ERR(ops.datbuf); 598 } else { 599 ops.datbuf = NULL; 600 } 601 602 if (usr_oob) { 603 ops.oobbuf = memdup_user(usr_oob, ops.ooblen); 604 if (IS_ERR(ops.oobbuf)) { 605 kfree(ops.datbuf); 606 return PTR_ERR(ops.oobbuf); 607 } 608 } else { 609 ops.oobbuf = NULL; 610 } 611 612 ret = mtd_write_oob(mtd, (loff_t)req.start, &ops); 613 614 kfree(ops.datbuf); 615 kfree(ops.oobbuf); 616 617 return ret; 618} 619 620static int mtdchar_ioctl(struct file *file, u_int cmd, u_long arg) 621{ 622 struct mtd_file_info *mfi = file->private_data; 623 struct mtd_info *mtd = mfi->mtd; 624 void __user *argp = (void __user *)arg; 625 int ret = 0; 626 u_long size; 627 struct mtd_info_user info; 628 629 pr_debug("MTD_ioctl\n"); 630 631 size = (cmd & IOCSIZE_MASK) >> IOCSIZE_SHIFT; 632 if (cmd & IOC_IN) { 633 if (!access_ok(VERIFY_READ, argp, size)) 634 return -EFAULT; 635 } 636 if (cmd & IOC_OUT) { 637 if (!access_ok(VERIFY_WRITE, argp, size)) 638 return -EFAULT; 639 } 640 641 switch (cmd) { 642 case MEMGETREGIONCOUNT: 643 if (copy_to_user(argp, &(mtd->numeraseregions), sizeof(int))) 644 return -EFAULT; 645 break; 646 647 case MEMGETREGIONINFO: 648 { 649 uint32_t ur_idx; 650 struct mtd_erase_region_info *kr; 651 struct region_info_user __user *ur = argp; 652 653 if (get_user(ur_idx, &(ur->regionindex))) 654 return -EFAULT; 655 656 if (ur_idx >= mtd->numeraseregions) 657 return -EINVAL; 658 659 kr = &(mtd->eraseregions[ur_idx]); 660 661 if (put_user(kr->offset, &(ur->offset)) 662 || put_user(kr->erasesize, &(ur->erasesize)) 663 || put_user(kr->numblocks, &(ur->numblocks))) 664 return -EFAULT; 665 666 break; 667 } 668 669 case MEMGETINFO: 670 memset(&info, 0, sizeof(info)); 671 info.type = mtd->type; 672 info.flags = mtd->flags; 673 info.size = mtd->size; 674 info.erasesize = mtd->erasesize; 675 info.writesize = mtd->writesize; 676 info.oobsize = mtd->oobsize; 677 /* The below field is obsolete */ 678 info.padding = 0; 679 if (copy_to_user(argp, &info, sizeof(struct mtd_info_user))) 680 return -EFAULT; 681 break; 682 683 case MEMERASE: 684 case MEMERASE64: 685 { 686 struct erase_info *erase; 687 688 if(!(file->f_mode & FMODE_WRITE)) 689 return -EPERM; 690 691 erase=kzalloc(sizeof(struct erase_info),GFP_KERNEL); 692 if (!erase) 693 ret = -ENOMEM; 694 else { 695 wait_queue_head_t waitq; 696 DECLARE_WAITQUEUE(wait, current); 697 698 init_waitqueue_head(&waitq); 699 700 if (cmd == MEMERASE64) { 701 struct erase_info_user64 einfo64; 702 703 if (copy_from_user(&einfo64, argp, 704 sizeof(struct erase_info_user64))) { 705 kfree(erase); 706 return -EFAULT; 707 } 708 erase->addr = einfo64.start; 709 erase->len = einfo64.length; 710 } else { 711 struct erase_info_user einfo32; 712 713 if (copy_from_user(&einfo32, argp, 714 sizeof(struct erase_info_user))) { 715 kfree(erase); 716 return -EFAULT; 717 } 718 erase->addr = einfo32.start; 719 erase->len = einfo32.length; 720 } 721 erase->mtd = mtd; 722 erase->callback = mtdchar_erase_callback; 723 erase->priv = (unsigned long)&waitq; 724 725 /* 726 FIXME: Allow INTERRUPTIBLE. Which means 727 not having the wait_queue head on the stack. 728 729 If the wq_head is on the stack, and we 730 leave because we got interrupted, then the 731 wq_head is no longer there when the 732 callback routine tries to wake us up. 733 */ 734 ret = mtd_erase(mtd, erase); 735 if (!ret) { 736 set_current_state(TASK_UNINTERRUPTIBLE); 737 add_wait_queue(&waitq, &wait); 738 if (erase->state != MTD_ERASE_DONE && 739 erase->state != MTD_ERASE_FAILED) 740 schedule(); 741 remove_wait_queue(&waitq, &wait); 742 set_current_state(TASK_RUNNING); 743 744 ret = (erase->state == MTD_ERASE_FAILED)?-EIO:0; 745 } 746 kfree(erase); 747 } 748 break; 749 } 750 751 case MEMWRITEOOB: 752 { 753 struct mtd_oob_buf buf; 754 struct mtd_oob_buf __user *buf_user = argp; 755 756 /* NOTE: writes return length to buf_user->length */ 757 if (copy_from_user(&buf, argp, sizeof(buf))) 758 ret = -EFAULT; 759 else 760 ret = mtdchar_writeoob(file, mtd, buf.start, buf.length, 761 buf.ptr, &buf_user->length); 762 break; 763 } 764 765 case MEMREADOOB: 766 { 767 struct mtd_oob_buf buf; 768 struct mtd_oob_buf __user *buf_user = argp; 769 770 /* NOTE: writes return length to buf_user->start */ 771 if (copy_from_user(&buf, argp, sizeof(buf))) 772 ret = -EFAULT; 773 else 774 ret = mtdchar_readoob(file, mtd, buf.start, buf.length, 775 buf.ptr, &buf_user->start); 776 break; 777 } 778 779 case MEMWRITEOOB64: 780 { 781 struct mtd_oob_buf64 buf; 782 struct mtd_oob_buf64 __user *buf_user = argp; 783 784 if (copy_from_user(&buf, argp, sizeof(buf))) 785 ret = -EFAULT; 786 else 787 ret = mtdchar_writeoob(file, mtd, buf.start, buf.length, 788 (void __user *)(uintptr_t)buf.usr_ptr, 789 &buf_user->length); 790 break; 791 } 792 793 case MEMREADOOB64: 794 { 795 struct mtd_oob_buf64 buf; 796 struct mtd_oob_buf64 __user *buf_user = argp; 797 798 if (copy_from_user(&buf, argp, sizeof(buf))) 799 ret = -EFAULT; 800 else 801 ret = mtdchar_readoob(file, mtd, buf.start, buf.length, 802 (void __user *)(uintptr_t)buf.usr_ptr, 803 &buf_user->length); 804 break; 805 } 806 807 case MEMWRITE: 808 { 809 ret = mtdchar_write_ioctl(mtd, 810 (struct mtd_write_req __user *)arg); 811 break; 812 } 813 814 case MEMLOCK: 815 { 816 struct erase_info_user einfo; 817 818 if (copy_from_user(&einfo, argp, sizeof(einfo))) 819 return -EFAULT; 820 821 ret = mtd_lock(mtd, einfo.start, einfo.length); 822 break; 823 } 824 825 case MEMUNLOCK: 826 { 827 struct erase_info_user einfo; 828 829 if (copy_from_user(&einfo, argp, sizeof(einfo))) 830 return -EFAULT; 831 832 ret = mtd_unlock(mtd, einfo.start, einfo.length); 833 break; 834 } 835 836 case MEMISLOCKED: 837 { 838 struct erase_info_user einfo; 839 840 if (copy_from_user(&einfo, argp, sizeof(einfo))) 841 return -EFAULT; 842 843 ret = mtd_is_locked(mtd, einfo.start, einfo.length); 844 break; 845 } 846 847 /* Legacy interface */ 848 case MEMGETOOBSEL: 849 { 850 struct nand_oobinfo oi; 851 852 if (!mtd->ecclayout) 853 return -EOPNOTSUPP; 854 if (mtd->ecclayout->eccbytes > ARRAY_SIZE(oi.eccpos)) 855 return -EINVAL; 856 857 oi.useecc = MTD_NANDECC_AUTOPLACE; 858 memcpy(&oi.eccpos, mtd->ecclayout->eccpos, sizeof(oi.eccpos)); 859 memcpy(&oi.oobfree, mtd->ecclayout->oobfree, 860 sizeof(oi.oobfree)); 861 oi.eccbytes = mtd->ecclayout->eccbytes; 862 863 if (copy_to_user(argp, &oi, sizeof(struct nand_oobinfo))) 864 return -EFAULT; 865 break; 866 } 867 868 case MEMGETBADBLOCK: 869 { 870 loff_t offs; 871 872 if (copy_from_user(&offs, argp, sizeof(loff_t))) 873 return -EFAULT; 874 return mtd_block_isbad(mtd, offs); 875 break; 876 } 877 878 case MEMSETBADBLOCK: 879 { 880 loff_t offs; 881 882 if (copy_from_user(&offs, argp, sizeof(loff_t))) 883 return -EFAULT; 884 return mtd_block_markbad(mtd, offs); 885 break; 886 } 887 888 case OTPSELECT: 889 { 890 int mode; 891 if (copy_from_user(&mode, argp, sizeof(int))) 892 return -EFAULT; 893 894 mfi->mode = MTD_FILE_MODE_NORMAL; 895 896 ret = otp_select_filemode(mfi, mode); 897 898 file->f_pos = 0; 899 break; 900 } 901 902 case OTPGETREGIONCOUNT: 903 case OTPGETREGIONINFO: 904 { 905 struct otp_info *buf = kmalloc(4096, GFP_KERNEL); 906 size_t retlen; 907 if (!buf) 908 return -ENOMEM; 909 switch (mfi->mode) { 910 case MTD_FILE_MODE_OTP_FACTORY: 911 ret = mtd_get_fact_prot_info(mtd, 4096, &retlen, buf); 912 break; 913 case MTD_FILE_MODE_OTP_USER: 914 ret = mtd_get_user_prot_info(mtd, 4096, &retlen, buf); 915 break; 916 default: 917 ret = -EINVAL; 918 break; 919 } 920 if (!ret) { 921 if (cmd == OTPGETREGIONCOUNT) { 922 int nbr = retlen / sizeof(struct otp_info); 923 ret = copy_to_user(argp, &nbr, sizeof(int)); 924 } else 925 ret = copy_to_user(argp, buf, retlen); 926 if (ret) 927 ret = -EFAULT; 928 } 929 kfree(buf); 930 break; 931 } 932 933 case OTPLOCK: 934 { 935 struct otp_info oinfo; 936 937 if (mfi->mode != MTD_FILE_MODE_OTP_USER) 938 return -EINVAL; 939 if (copy_from_user(&oinfo, argp, sizeof(oinfo))) 940 return -EFAULT; 941 ret = mtd_lock_user_prot_reg(mtd, oinfo.start, oinfo.length); 942 break; 943 } 944 945 /* This ioctl is being deprecated - it truncates the ECC layout */ 946 case ECCGETLAYOUT: 947 { 948 struct nand_ecclayout_user *usrlay; 949 950 if (!mtd->ecclayout) 951 return -EOPNOTSUPP; 952 953 usrlay = kmalloc(sizeof(*usrlay), GFP_KERNEL); 954 if (!usrlay) 955 return -ENOMEM; 956 957 shrink_ecclayout(mtd->ecclayout, usrlay); 958 959 if (copy_to_user(argp, usrlay, sizeof(*usrlay))) 960 ret = -EFAULT; 961 kfree(usrlay); 962 break; 963 } 964 965 case ECCGETSTATS: 966 { 967 if (copy_to_user(argp, &mtd->ecc_stats, 968 sizeof(struct mtd_ecc_stats))) 969 return -EFAULT; 970 break; 971 } 972 973 case MTDFILEMODE: 974 { 975 mfi->mode = 0; 976 977 switch(arg) { 978 case MTD_FILE_MODE_OTP_FACTORY: 979 case MTD_FILE_MODE_OTP_USER: 980 ret = otp_select_filemode(mfi, arg); 981 break; 982 983 case MTD_FILE_MODE_RAW: 984 if (!mtd_has_oob(mtd)) 985 return -EOPNOTSUPP; 986 mfi->mode = arg; 987 988 case MTD_FILE_MODE_NORMAL: 989 break; 990 default: 991 ret = -EINVAL; 992 } 993 file->f_pos = 0; 994 break; 995 } 996 997 case BLKPG: 998 { 999 ret = mtdchar_blkpg_ioctl(mtd, 1000 (struct blkpg_ioctl_arg __user *)arg); 1001 break; 1002 } 1003 1004 case BLKRRPART: 1005 { 1006 /* No reread partition feature. Just return ok */ 1007 ret = 0; 1008 break; 1009 } 1010 1011 default: 1012 ret = -ENOTTY; 1013 } 1014 1015 return ret; 1016} /* memory_ioctl */ 1017 1018static long mtdchar_unlocked_ioctl(struct file *file, u_int cmd, u_long arg) 1019{ 1020 int ret; 1021 1022 mutex_lock(&mtd_mutex); 1023 ret = mtdchar_ioctl(file, cmd, arg); 1024 mutex_unlock(&mtd_mutex); 1025 1026 return ret; 1027} 1028 1029#ifdef CONFIG_COMPAT 1030 1031struct mtd_oob_buf32 { 1032 u_int32_t start; 1033 u_int32_t length; 1034 compat_caddr_t ptr; /* unsigned char* */ 1035}; 1036 1037#define MEMWRITEOOB32 _IOWR('M', 3, struct mtd_oob_buf32) 1038#define MEMREADOOB32 _IOWR('M', 4, struct mtd_oob_buf32) 1039 1040static long mtdchar_compat_ioctl(struct file *file, unsigned int cmd, 1041 unsigned long arg) 1042{ 1043 struct mtd_file_info *mfi = file->private_data; 1044 struct mtd_info *mtd = mfi->mtd; 1045 void __user *argp = compat_ptr(arg); 1046 int ret = 0; 1047 1048 mutex_lock(&mtd_mutex); 1049 1050 switch (cmd) { 1051 case MEMWRITEOOB32: 1052 { 1053 struct mtd_oob_buf32 buf; 1054 struct mtd_oob_buf32 __user *buf_user = argp; 1055 1056 if (copy_from_user(&buf, argp, sizeof(buf))) 1057 ret = -EFAULT; 1058 else 1059 ret = mtdchar_writeoob(file, mtd, buf.start, 1060 buf.length, compat_ptr(buf.ptr), 1061 &buf_user->length); 1062 break; 1063 } 1064 1065 case MEMREADOOB32: 1066 { 1067 struct mtd_oob_buf32 buf; 1068 struct mtd_oob_buf32 __user *buf_user = argp; 1069 1070 /* NOTE: writes return length to buf->start */ 1071 if (copy_from_user(&buf, argp, sizeof(buf))) 1072 ret = -EFAULT; 1073 else 1074 ret = mtdchar_readoob(file, mtd, buf.start, 1075 buf.length, compat_ptr(buf.ptr), 1076 &buf_user->start); 1077 break; 1078 } 1079 default: 1080 ret = mtdchar_ioctl(file, cmd, (unsigned long)argp); 1081 } 1082 1083 mutex_unlock(&mtd_mutex); 1084 1085 return ret; 1086} 1087 1088#endif /* CONFIG_COMPAT */ 1089 1090/* 1091 * try to determine where a shared mapping can be made 1092 * - only supported for NOMMU at the moment (MMU can't doesn't copy private 1093 * mappings) 1094 */ 1095#ifndef CONFIG_MMU 1096static unsigned long mtdchar_get_unmapped_area(struct file *file, 1097 unsigned long addr, 1098 unsigned long len, 1099 unsigned long pgoff, 1100 unsigned long flags) 1101{ 1102 struct mtd_file_info *mfi = file->private_data; 1103 struct mtd_info *mtd = mfi->mtd; 1104 unsigned long offset; 1105 int ret; 1106 1107 if (addr != 0) 1108 return (unsigned long) -EINVAL; 1109 1110 if (len > mtd->size || pgoff >= (mtd->size >> PAGE_SHIFT)) 1111 return (unsigned long) -EINVAL; 1112 1113 offset = pgoff << PAGE_SHIFT; 1114 if (offset > mtd->size - len) 1115 return (unsigned long) -EINVAL; 1116 1117 ret = mtd_get_unmapped_area(mtd, len, offset, flags); 1118 return ret == -EOPNOTSUPP ? -ENODEV : ret; 1119} 1120#endif 1121 1122/* 1123 * set up a mapping for shared memory segments 1124 */ 1125static int mtdchar_mmap(struct file *file, struct vm_area_struct *vma) 1126{ 1127#ifdef CONFIG_MMU 1128 struct mtd_file_info *mfi = file->private_data; 1129 struct mtd_info *mtd = mfi->mtd; 1130 struct map_info *map = mtd->priv; 1131 1132 /* This is broken because it assumes the MTD device is map-based 1133 and that mtd->priv is a valid struct map_info. It should be 1134 replaced with something that uses the mtd_get_unmapped_area() 1135 operation properly. */ 1136 if (0 /*mtd->type == MTD_RAM || mtd->type == MTD_ROM*/) { 1137#ifdef pgprot_noncached 1138 if (file->f_flags & O_DSYNC || map->phys >= __pa(high_memory)) 1139 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); 1140#endif 1141 return vm_iomap_memory(vma, map->phys, map->size); 1142 } 1143 return -ENODEV; 1144#else 1145 return vma->vm_flags & VM_SHARED ? 0 : -EACCES; 1146#endif 1147} 1148 1149static const struct file_operations mtd_fops = { 1150 .owner = THIS_MODULE, 1151 .llseek = mtdchar_lseek, 1152 .read = mtdchar_read, 1153 .write = mtdchar_write, 1154 .unlocked_ioctl = mtdchar_unlocked_ioctl, 1155#ifdef CONFIG_COMPAT 1156 .compat_ioctl = mtdchar_compat_ioctl, 1157#endif 1158 .open = mtdchar_open, 1159 .release = mtdchar_close, 1160 .mmap = mtdchar_mmap, 1161#ifndef CONFIG_MMU 1162 .get_unmapped_area = mtdchar_get_unmapped_area, 1163#endif 1164}; 1165 1166static const struct super_operations mtd_ops = { 1167 .drop_inode = generic_delete_inode, 1168 .statfs = simple_statfs, 1169}; 1170 1171static struct dentry *mtd_inodefs_mount(struct file_system_type *fs_type, 1172 int flags, const char *dev_name, void *data) 1173{ 1174 return mount_pseudo(fs_type, "mtd_inode:", &mtd_ops, NULL, MTD_INODE_FS_MAGIC); 1175} 1176 1177static struct file_system_type mtd_inodefs_type = { 1178 .name = "mtd_inodefs", 1179 .mount = mtd_inodefs_mount, 1180 .kill_sb = kill_anon_super, 1181}; 1182MODULE_ALIAS_FS("mtd_inodefs"); 1183 1184int __init init_mtdchar(void) 1185{ 1186 int ret; 1187 1188 ret = __register_chrdev(MTD_CHAR_MAJOR, 0, 1 << MINORBITS, 1189 "mtd", &mtd_fops); 1190 if (ret < 0) { 1191 pr_err("Can't allocate major number %d for MTD\n", 1192 MTD_CHAR_MAJOR); 1193 return ret; 1194 } 1195 1196 ret = register_filesystem(&mtd_inodefs_type); 1197 if (ret) { 1198 pr_err("Can't register mtd_inodefs filesystem, error %d\n", 1199 ret); 1200 goto err_unregister_chdev; 1201 } 1202 1203 return ret; 1204 1205err_unregister_chdev: 1206 __unregister_chrdev(MTD_CHAR_MAJOR, 0, 1 << MINORBITS, "mtd"); 1207 return ret; 1208} 1209 1210void __exit cleanup_mtdchar(void) 1211{ 1212 unregister_filesystem(&mtd_inodefs_type); 1213 __unregister_chrdev(MTD_CHAR_MAJOR, 0, 1 << MINORBITS, "mtd"); 1214} 1215 1216MODULE_ALIAS_CHARDEV_MAJOR(MTD_CHAR_MAJOR); 1217