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/smp_lock.h> 30 #include <linux/backing-dev.h> 31 #include <linux/compat.h> 32 #include <linux/mount.h> 33 34 #include <linux/mtd/mtd.h> 35 #include <linux/mtd/map.h> 36 37 #include <asm/uaccess.h> 38 39 #define MTD_INODE_FS_MAGIC 0x11307854 40 static struct vfsmount *mtd_inode_mnt __read_mostly; 41 42 /* 43 * Data structure to hold the pointer to the mtd device as well 44 * as mode information ofr various use cases. 45 */ 46 struct mtd_file_info { 47 struct mtd_info *mtd; 48 struct inode *ino; 49 enum mtd_file_modes mode; 50 }; 51 52 static loff_t mtd_lseek (struct file *file, loff_t offset, int orig) 53 { 54 struct mtd_file_info *mfi = file->private_data; 55 struct mtd_info *mtd = mfi->mtd; 56 57 switch (orig) { 58 case SEEK_SET: 59 break; 60 case SEEK_CUR: 61 offset += file->f_pos; 62 break; 63 case SEEK_END: 64 offset += mtd->size; 65 break; 66 default: 67 return -EINVAL; 68 } 69 70 if (offset >= 0 && offset <= mtd->size) 71 return file->f_pos = offset; 72 73 return -EINVAL; 74 } 75 76 77 78 static int mtd_open(struct inode *inode, struct file *file) 79 { 80 int minor = iminor(inode); 81 int devnum = minor >> 1; 82 int ret = 0; 83 struct mtd_info *mtd; 84 struct mtd_file_info *mfi; 85 struct inode *mtd_ino; 86 87 DEBUG(MTD_DEBUG_LEVEL0, "MTD_open\n"); 88 89 /* You can't open the RO devices RW */ 90 if ((file->f_mode & FMODE_WRITE) && (minor & 1)) 91 return -EACCES; 92 93 lock_kernel(); 94 mtd = get_mtd_device(NULL, devnum); 95 96 if (IS_ERR(mtd)) { 97 ret = PTR_ERR(mtd); 98 goto out; 99 } 100 101 if (mtd->type == MTD_ABSENT) { 102 put_mtd_device(mtd); 103 ret = -ENODEV; 104 goto out; 105 } 106 107 mtd_ino = iget_locked(mtd_inode_mnt->mnt_sb, devnum); 108 if (!mtd_ino) { 109 put_mtd_device(mtd); 110 ret = -ENOMEM; 111 goto out; 112 } 113 if (mtd_ino->i_state & I_NEW) { 114 mtd_ino->i_private = mtd; 115 mtd_ino->i_mode = S_IFCHR; 116 mtd_ino->i_data.backing_dev_info = mtd->backing_dev_info; 117 unlock_new_inode(mtd_ino); 118 } 119 file->f_mapping = mtd_ino->i_mapping; 120 121 /* You can't open it RW if it's not a writeable device */ 122 if ((file->f_mode & FMODE_WRITE) && !(mtd->flags & MTD_WRITEABLE)) { 123 iput(mtd_ino); 124 put_mtd_device(mtd); 125 ret = -EACCES; 126 goto out; 127 } 128 129 mfi = kzalloc(sizeof(*mfi), GFP_KERNEL); 130 if (!mfi) { 131 iput(mtd_ino); 132 put_mtd_device(mtd); 133 ret = -ENOMEM; 134 goto out; 135 } 136 mfi->ino = mtd_ino; 137 mfi->mtd = mtd; 138 file->private_data = mfi; 139 140 out: 141 unlock_kernel(); 142 return ret; 143 } /* mtd_open */ 144 145 /*====================================================================*/ 146 147 static int mtd_close(struct inode *inode, struct file *file) 148 { 149 struct mtd_file_info *mfi = file->private_data; 150 struct mtd_info *mtd = mfi->mtd; 151 152 DEBUG(MTD_DEBUG_LEVEL0, "MTD_close\n"); 153 154 /* Only sync if opened RW */ 155 if ((file->f_mode & FMODE_WRITE) && mtd->sync) 156 mtd->sync(mtd); 157 158 iput(mfi->ino); 159 160 put_mtd_device(mtd); 161 file->private_data = NULL; 162 kfree(mfi); 163 164 return 0; 165 } /* mtd_close */ 166 167 /* FIXME: This _really_ needs to die. In 2.5, we should lock the 168 userspace buffer down and use it directly with readv/writev. 169 */ 170 #define MAX_KMALLOC_SIZE 0x20000 171 172 static ssize_t mtd_read(struct file *file, char __user *buf, size_t count,loff_t *ppos) 173 { 174 struct mtd_file_info *mfi = file->private_data; 175 struct mtd_info *mtd = mfi->mtd; 176 size_t retlen=0; 177 size_t total_retlen=0; 178 int ret=0; 179 int len; 180 char *kbuf; 181 182 DEBUG(MTD_DEBUG_LEVEL0,"MTD_read\n"); 183 184 if (*ppos + count > mtd->size) 185 count = mtd->size - *ppos; 186 187 if (!count) 188 return 0; 189 190 /* FIXME: Use kiovec in 2.5 to lock down the user's buffers 191 and pass them directly to the MTD functions */ 192 193 if (count > MAX_KMALLOC_SIZE) 194 kbuf=kmalloc(MAX_KMALLOC_SIZE, GFP_KERNEL); 195 else 196 kbuf=kmalloc(count, GFP_KERNEL); 197 198 if (!kbuf) 199 return -ENOMEM; 200 201 while (count) { 202 203 if (count > MAX_KMALLOC_SIZE) 204 len = MAX_KMALLOC_SIZE; 205 else 206 len = count; 207 208 switch (mfi->mode) { 209 case MTD_MODE_OTP_FACTORY: 210 ret = mtd->read_fact_prot_reg(mtd, *ppos, len, &retlen, kbuf); 211 break; 212 case MTD_MODE_OTP_USER: 213 ret = mtd->read_user_prot_reg(mtd, *ppos, len, &retlen, kbuf); 214 break; 215 case MTD_MODE_RAW: 216 { 217 struct mtd_oob_ops ops; 218 219 ops.mode = MTD_OOB_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 occured 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 || (ret == -EUCLEAN) || (ret == -EBADMSG)) { 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 } /* mtd_read */ 264 265 static ssize_t mtd_write(struct file *file, const char __user *buf, size_t count,loff_t *ppos) 266 { 267 struct mtd_file_info *mfi = file->private_data; 268 struct mtd_info *mtd = mfi->mtd; 269 char *kbuf; 270 size_t retlen; 271 size_t total_retlen=0; 272 int ret=0; 273 int len; 274 275 DEBUG(MTD_DEBUG_LEVEL0,"MTD_write\n"); 276 277 if (*ppos == mtd->size) 278 return -ENOSPC; 279 280 if (*ppos + count > mtd->size) 281 count = mtd->size - *ppos; 282 283 if (!count) 284 return 0; 285 286 if (count > MAX_KMALLOC_SIZE) 287 kbuf=kmalloc(MAX_KMALLOC_SIZE, GFP_KERNEL); 288 else 289 kbuf=kmalloc(count, GFP_KERNEL); 290 291 if (!kbuf) 292 return -ENOMEM; 293 294 while (count) { 295 296 if (count > MAX_KMALLOC_SIZE) 297 len = MAX_KMALLOC_SIZE; 298 else 299 len = count; 300 301 if (copy_from_user(kbuf, buf, len)) { 302 kfree(kbuf); 303 return -EFAULT; 304 } 305 306 switch (mfi->mode) { 307 case MTD_MODE_OTP_FACTORY: 308 ret = -EROFS; 309 break; 310 case MTD_MODE_OTP_USER: 311 if (!mtd->write_user_prot_reg) { 312 ret = -EOPNOTSUPP; 313 break; 314 } 315 ret = mtd->write_user_prot_reg(mtd, *ppos, len, &retlen, kbuf); 316 break; 317 318 case MTD_MODE_RAW: 319 { 320 struct mtd_oob_ops ops; 321 322 ops.mode = MTD_OOB_RAW; 323 ops.datbuf = kbuf; 324 ops.oobbuf = NULL; 325 ops.len = len; 326 327 ret = mtd->write_oob(mtd, *ppos, &ops); 328 retlen = ops.retlen; 329 break; 330 } 331 332 default: 333 ret = (*(mtd->write))(mtd, *ppos, len, &retlen, kbuf); 334 } 335 if (!ret) { 336 *ppos += retlen; 337 total_retlen += retlen; 338 count -= retlen; 339 buf += retlen; 340 } 341 else { 342 kfree(kbuf); 343 return ret; 344 } 345 } 346 347 kfree(kbuf); 348 return total_retlen; 349 } /* mtd_write */ 350 351 /*====================================================================== 352 353 IOCTL calls for getting device parameters. 354 355 ======================================================================*/ 356 static void mtdchar_erase_callback (struct erase_info *instr) 357 { 358 wake_up((wait_queue_head_t *)instr->priv); 359 } 360 361 #ifdef CONFIG_HAVE_MTD_OTP 362 static int otp_select_filemode(struct mtd_file_info *mfi, int mode) 363 { 364 struct mtd_info *mtd = mfi->mtd; 365 int ret = 0; 366 367 switch (mode) { 368 case MTD_OTP_FACTORY: 369 if (!mtd->read_fact_prot_reg) 370 ret = -EOPNOTSUPP; 371 else 372 mfi->mode = MTD_MODE_OTP_FACTORY; 373 break; 374 case MTD_OTP_USER: 375 if (!mtd->read_fact_prot_reg) 376 ret = -EOPNOTSUPP; 377 else 378 mfi->mode = MTD_MODE_OTP_USER; 379 break; 380 default: 381 ret = -EINVAL; 382 case MTD_OTP_OFF: 383 break; 384 } 385 return ret; 386 } 387 #else 388 # define otp_select_filemode(f,m) -EOPNOTSUPP 389 #endif 390 391 static int mtd_do_writeoob(struct file *file, struct mtd_info *mtd, 392 uint64_t start, uint32_t length, void __user *ptr, 393 uint32_t __user *retp) 394 { 395 struct mtd_oob_ops ops; 396 uint32_t retlen; 397 int ret = 0; 398 399 if (!(file->f_mode & FMODE_WRITE)) 400 return -EPERM; 401 402 if (length > 4096) 403 return -EINVAL; 404 405 if (!mtd->write_oob) 406 ret = -EOPNOTSUPP; 407 else 408 ret = access_ok(VERIFY_READ, ptr, length) ? 0 : -EFAULT; 409 410 if (ret) 411 return ret; 412 413 ops.ooblen = length; 414 ops.ooboffs = start & (mtd->oobsize - 1); 415 ops.datbuf = NULL; 416 ops.mode = MTD_OOB_PLACE; 417 418 if (ops.ooboffs && ops.ooblen > (mtd->oobsize - ops.ooboffs)) 419 return -EINVAL; 420 421 ops.oobbuf = memdup_user(ptr, length); 422 if (IS_ERR(ops.oobbuf)) 423 return PTR_ERR(ops.oobbuf); 424 425 start &= ~((uint64_t)mtd->oobsize - 1); 426 ret = mtd->write_oob(mtd, start, &ops); 427 428 if (ops.oobretlen > 0xFFFFFFFFU) 429 ret = -EOVERFLOW; 430 retlen = ops.oobretlen; 431 if (copy_to_user(retp, &retlen, sizeof(length))) 432 ret = -EFAULT; 433 434 kfree(ops.oobbuf); 435 return ret; 436 } 437 438 static int mtd_do_readoob(struct mtd_info *mtd, uint64_t start, 439 uint32_t length, void __user *ptr, uint32_t __user *retp) 440 { 441 struct mtd_oob_ops ops; 442 int ret = 0; 443 444 if (length > 4096) 445 return -EINVAL; 446 447 if (!mtd->read_oob) 448 ret = -EOPNOTSUPP; 449 else 450 ret = access_ok(VERIFY_WRITE, ptr, 451 length) ? 0 : -EFAULT; 452 if (ret) 453 return ret; 454 455 ops.ooblen = length; 456 ops.ooboffs = start & (mtd->oobsize - 1); 457 ops.datbuf = NULL; 458 ops.mode = MTD_OOB_PLACE; 459 460 if (ops.ooboffs && ops.ooblen > (mtd->oobsize - ops.ooboffs)) 461 return -EINVAL; 462 463 ops.oobbuf = kmalloc(length, GFP_KERNEL); 464 if (!ops.oobbuf) 465 return -ENOMEM; 466 467 start &= ~((uint64_t)mtd->oobsize - 1); 468 ret = mtd->read_oob(mtd, start, &ops); 469 470 if (put_user(ops.oobretlen, retp)) 471 ret = -EFAULT; 472 else if (ops.oobretlen && copy_to_user(ptr, ops.oobbuf, 473 ops.oobretlen)) 474 ret = -EFAULT; 475 476 kfree(ops.oobbuf); 477 return ret; 478 } 479 480 static int mtd_ioctl(struct file *file, u_int cmd, u_long arg) 481 { 482 struct mtd_file_info *mfi = file->private_data; 483 struct mtd_info *mtd = mfi->mtd; 484 void __user *argp = (void __user *)arg; 485 int ret = 0; 486 u_long size; 487 struct mtd_info_user info; 488 489 DEBUG(MTD_DEBUG_LEVEL0, "MTD_ioctl\n"); 490 491 size = (cmd & IOCSIZE_MASK) >> IOCSIZE_SHIFT; 492 if (cmd & IOC_IN) { 493 if (!access_ok(VERIFY_READ, argp, size)) 494 return -EFAULT; 495 } 496 if (cmd & IOC_OUT) { 497 if (!access_ok(VERIFY_WRITE, argp, size)) 498 return -EFAULT; 499 } 500 501 switch (cmd) { 502 case MEMGETREGIONCOUNT: 503 if (copy_to_user(argp, &(mtd->numeraseregions), sizeof(int))) 504 return -EFAULT; 505 break; 506 507 case MEMGETREGIONINFO: 508 { 509 uint32_t ur_idx; 510 struct mtd_erase_region_info *kr; 511 struct region_info_user __user *ur = argp; 512 513 if (get_user(ur_idx, &(ur->regionindex))) 514 return -EFAULT; 515 516 kr = &(mtd->eraseregions[ur_idx]); 517 518 if (put_user(kr->offset, &(ur->offset)) 519 || put_user(kr->erasesize, &(ur->erasesize)) 520 || put_user(kr->numblocks, &(ur->numblocks))) 521 return -EFAULT; 522 523 break; 524 } 525 526 case MEMGETINFO: 527 info.type = mtd->type; 528 info.flags = mtd->flags; 529 info.size = mtd->size; 530 info.erasesize = mtd->erasesize; 531 info.writesize = mtd->writesize; 532 info.oobsize = mtd->oobsize; 533 /* The below fields are obsolete */ 534 info.ecctype = -1; 535 info.eccsize = 0; 536 if (copy_to_user(argp, &info, sizeof(struct mtd_info_user))) 537 return -EFAULT; 538 break; 539 540 case MEMERASE: 541 case MEMERASE64: 542 { 543 struct erase_info *erase; 544 545 if(!(file->f_mode & FMODE_WRITE)) 546 return -EPERM; 547 548 erase=kzalloc(sizeof(struct erase_info),GFP_KERNEL); 549 if (!erase) 550 ret = -ENOMEM; 551 else { 552 wait_queue_head_t waitq; 553 DECLARE_WAITQUEUE(wait, current); 554 555 init_waitqueue_head(&waitq); 556 557 if (cmd == MEMERASE64) { 558 struct erase_info_user64 einfo64; 559 560 if (copy_from_user(&einfo64, argp, 561 sizeof(struct erase_info_user64))) { 562 kfree(erase); 563 return -EFAULT; 564 } 565 erase->addr = einfo64.start; 566 erase->len = einfo64.length; 567 } else { 568 struct erase_info_user einfo32; 569 570 if (copy_from_user(&einfo32, argp, 571 sizeof(struct erase_info_user))) { 572 kfree(erase); 573 return -EFAULT; 574 } 575 erase->addr = einfo32.start; 576 erase->len = einfo32.length; 577 } 578 erase->mtd = mtd; 579 erase->callback = mtdchar_erase_callback; 580 erase->priv = (unsigned long)&waitq; 581 582 /* 583 FIXME: Allow INTERRUPTIBLE. Which means 584 not having the wait_queue head on the stack. 585 586 If the wq_head is on the stack, and we 587 leave because we got interrupted, then the 588 wq_head is no longer there when the 589 callback routine tries to wake us up. 590 */ 591 ret = mtd->erase(mtd, erase); 592 if (!ret) { 593 set_current_state(TASK_UNINTERRUPTIBLE); 594 add_wait_queue(&waitq, &wait); 595 if (erase->state != MTD_ERASE_DONE && 596 erase->state != MTD_ERASE_FAILED) 597 schedule(); 598 remove_wait_queue(&waitq, &wait); 599 set_current_state(TASK_RUNNING); 600 601 ret = (erase->state == MTD_ERASE_FAILED)?-EIO:0; 602 } 603 kfree(erase); 604 } 605 break; 606 } 607 608 case MEMWRITEOOB: 609 { 610 struct mtd_oob_buf buf; 611 struct mtd_oob_buf __user *buf_user = argp; 612 613 /* NOTE: writes return length to buf_user->length */ 614 if (copy_from_user(&buf, argp, sizeof(buf))) 615 ret = -EFAULT; 616 else 617 ret = mtd_do_writeoob(file, mtd, buf.start, buf.length, 618 buf.ptr, &buf_user->length); 619 break; 620 } 621 622 case MEMREADOOB: 623 { 624 struct mtd_oob_buf buf; 625 struct mtd_oob_buf __user *buf_user = argp; 626 627 /* NOTE: writes return length to buf_user->start */ 628 if (copy_from_user(&buf, argp, sizeof(buf))) 629 ret = -EFAULT; 630 else 631 ret = mtd_do_readoob(mtd, buf.start, buf.length, 632 buf.ptr, &buf_user->start); 633 break; 634 } 635 636 case MEMWRITEOOB64: 637 { 638 struct mtd_oob_buf64 buf; 639 struct mtd_oob_buf64 __user *buf_user = argp; 640 641 if (copy_from_user(&buf, argp, sizeof(buf))) 642 ret = -EFAULT; 643 else 644 ret = mtd_do_writeoob(file, mtd, buf.start, buf.length, 645 (void __user *)(uintptr_t)buf.usr_ptr, 646 &buf_user->length); 647 break; 648 } 649 650 case MEMREADOOB64: 651 { 652 struct mtd_oob_buf64 buf; 653 struct mtd_oob_buf64 __user *buf_user = argp; 654 655 if (copy_from_user(&buf, argp, sizeof(buf))) 656 ret = -EFAULT; 657 else 658 ret = mtd_do_readoob(mtd, buf.start, buf.length, 659 (void __user *)(uintptr_t)buf.usr_ptr, 660 &buf_user->length); 661 break; 662 } 663 664 case MEMLOCK: 665 { 666 struct erase_info_user einfo; 667 668 if (copy_from_user(&einfo, argp, sizeof(einfo))) 669 return -EFAULT; 670 671 if (!mtd->lock) 672 ret = -EOPNOTSUPP; 673 else 674 ret = mtd->lock(mtd, einfo.start, einfo.length); 675 break; 676 } 677 678 case MEMUNLOCK: 679 { 680 struct erase_info_user einfo; 681 682 if (copy_from_user(&einfo, argp, sizeof(einfo))) 683 return -EFAULT; 684 685 if (!mtd->unlock) 686 ret = -EOPNOTSUPP; 687 else 688 ret = mtd->unlock(mtd, einfo.start, einfo.length); 689 break; 690 } 691 692 case MEMISLOCKED: 693 { 694 struct erase_info_user einfo; 695 696 if (copy_from_user(&einfo, argp, sizeof(einfo))) 697 return -EFAULT; 698 699 if (!mtd->is_locked) 700 ret = -EOPNOTSUPP; 701 else 702 ret = mtd->is_locked(mtd, einfo.start, einfo.length); 703 break; 704 } 705 706 /* Legacy interface */ 707 case MEMGETOOBSEL: 708 { 709 struct nand_oobinfo oi; 710 711 if (!mtd->ecclayout) 712 return -EOPNOTSUPP; 713 if (mtd->ecclayout->eccbytes > ARRAY_SIZE(oi.eccpos)) 714 return -EINVAL; 715 716 oi.useecc = MTD_NANDECC_AUTOPLACE; 717 memcpy(&oi.eccpos, mtd->ecclayout->eccpos, sizeof(oi.eccpos)); 718 memcpy(&oi.oobfree, mtd->ecclayout->oobfree, 719 sizeof(oi.oobfree)); 720 oi.eccbytes = mtd->ecclayout->eccbytes; 721 722 if (copy_to_user(argp, &oi, sizeof(struct nand_oobinfo))) 723 return -EFAULT; 724 break; 725 } 726 727 case MEMGETBADBLOCK: 728 { 729 loff_t offs; 730 731 if (copy_from_user(&offs, argp, sizeof(loff_t))) 732 return -EFAULT; 733 if (!mtd->block_isbad) 734 ret = -EOPNOTSUPP; 735 else 736 return mtd->block_isbad(mtd, offs); 737 break; 738 } 739 740 case MEMSETBADBLOCK: 741 { 742 loff_t offs; 743 744 if (copy_from_user(&offs, argp, sizeof(loff_t))) 745 return -EFAULT; 746 if (!mtd->block_markbad) 747 ret = -EOPNOTSUPP; 748 else 749 return mtd->block_markbad(mtd, offs); 750 break; 751 } 752 753 #ifdef CONFIG_HAVE_MTD_OTP 754 case OTPSELECT: 755 { 756 int mode; 757 if (copy_from_user(&mode, argp, sizeof(int))) 758 return -EFAULT; 759 760 mfi->mode = MTD_MODE_NORMAL; 761 762 ret = otp_select_filemode(mfi, mode); 763 764 file->f_pos = 0; 765 break; 766 } 767 768 case OTPGETREGIONCOUNT: 769 case OTPGETREGIONINFO: 770 { 771 struct otp_info *buf = kmalloc(4096, GFP_KERNEL); 772 if (!buf) 773 return -ENOMEM; 774 ret = -EOPNOTSUPP; 775 switch (mfi->mode) { 776 case MTD_MODE_OTP_FACTORY: 777 if (mtd->get_fact_prot_info) 778 ret = mtd->get_fact_prot_info(mtd, buf, 4096); 779 break; 780 case MTD_MODE_OTP_USER: 781 if (mtd->get_user_prot_info) 782 ret = mtd->get_user_prot_info(mtd, buf, 4096); 783 break; 784 default: 785 break; 786 } 787 if (ret >= 0) { 788 if (cmd == OTPGETREGIONCOUNT) { 789 int nbr = ret / sizeof(struct otp_info); 790 ret = copy_to_user(argp, &nbr, sizeof(int)); 791 } else 792 ret = copy_to_user(argp, buf, ret); 793 if (ret) 794 ret = -EFAULT; 795 } 796 kfree(buf); 797 break; 798 } 799 800 case OTPLOCK: 801 { 802 struct otp_info oinfo; 803 804 if (mfi->mode != MTD_MODE_OTP_USER) 805 return -EINVAL; 806 if (copy_from_user(&oinfo, argp, sizeof(oinfo))) 807 return -EFAULT; 808 if (!mtd->lock_user_prot_reg) 809 return -EOPNOTSUPP; 810 ret = mtd->lock_user_prot_reg(mtd, oinfo.start, oinfo.length); 811 break; 812 } 813 #endif 814 815 case ECCGETLAYOUT: 816 { 817 if (!mtd->ecclayout) 818 return -EOPNOTSUPP; 819 820 if (copy_to_user(argp, mtd->ecclayout, 821 sizeof(struct nand_ecclayout))) 822 return -EFAULT; 823 break; 824 } 825 826 case ECCGETSTATS: 827 { 828 if (copy_to_user(argp, &mtd->ecc_stats, 829 sizeof(struct mtd_ecc_stats))) 830 return -EFAULT; 831 break; 832 } 833 834 case MTDFILEMODE: 835 { 836 mfi->mode = 0; 837 838 switch(arg) { 839 case MTD_MODE_OTP_FACTORY: 840 case MTD_MODE_OTP_USER: 841 ret = otp_select_filemode(mfi, arg); 842 break; 843 844 case MTD_MODE_RAW: 845 if (!mtd->read_oob || !mtd->write_oob) 846 return -EOPNOTSUPP; 847 mfi->mode = arg; 848 849 case MTD_MODE_NORMAL: 850 break; 851 default: 852 ret = -EINVAL; 853 } 854 file->f_pos = 0; 855 break; 856 } 857 858 default: 859 ret = -ENOTTY; 860 } 861 862 return ret; 863 } /* memory_ioctl */ 864 865 static long mtd_unlocked_ioctl(struct file *file, u_int cmd, u_long arg) 866 { 867 int ret; 868 869 lock_kernel(); 870 ret = mtd_ioctl(file, cmd, arg); 871 unlock_kernel(); 872 873 return ret; 874 } 875 876 #ifdef CONFIG_COMPAT 877 878 struct mtd_oob_buf32 { 879 u_int32_t start; 880 u_int32_t length; 881 compat_caddr_t ptr; /* unsigned char* */ 882 }; 883 884 #define MEMWRITEOOB32 _IOWR('M', 3, struct mtd_oob_buf32) 885 #define MEMREADOOB32 _IOWR('M', 4, struct mtd_oob_buf32) 886 887 static long mtd_compat_ioctl(struct file *file, unsigned int cmd, 888 unsigned long arg) 889 { 890 struct mtd_file_info *mfi = file->private_data; 891 struct mtd_info *mtd = mfi->mtd; 892 void __user *argp = compat_ptr(arg); 893 int ret = 0; 894 895 lock_kernel(); 896 897 switch (cmd) { 898 case MEMWRITEOOB32: 899 { 900 struct mtd_oob_buf32 buf; 901 struct mtd_oob_buf32 __user *buf_user = argp; 902 903 if (copy_from_user(&buf, argp, sizeof(buf))) 904 ret = -EFAULT; 905 else 906 ret = mtd_do_writeoob(file, mtd, buf.start, 907 buf.length, compat_ptr(buf.ptr), 908 &buf_user->length); 909 break; 910 } 911 912 case MEMREADOOB32: 913 { 914 struct mtd_oob_buf32 buf; 915 struct mtd_oob_buf32 __user *buf_user = argp; 916 917 /* NOTE: writes return length to buf->start */ 918 if (copy_from_user(&buf, argp, sizeof(buf))) 919 ret = -EFAULT; 920 else 921 ret = mtd_do_readoob(mtd, buf.start, 922 buf.length, compat_ptr(buf.ptr), 923 &buf_user->start); 924 break; 925 } 926 default: 927 ret = mtd_ioctl(file, cmd, (unsigned long)argp); 928 } 929 930 unlock_kernel(); 931 932 return ret; 933 } 934 935 #endif /* CONFIG_COMPAT */ 936 937 /* 938 * try to determine where a shared mapping can be made 939 * - only supported for NOMMU at the moment (MMU can't doesn't copy private 940 * mappings) 941 */ 942 #ifndef CONFIG_MMU 943 static unsigned long mtd_get_unmapped_area(struct file *file, 944 unsigned long addr, 945 unsigned long len, 946 unsigned long pgoff, 947 unsigned long flags) 948 { 949 struct mtd_file_info *mfi = file->private_data; 950 struct mtd_info *mtd = mfi->mtd; 951 952 if (mtd->get_unmapped_area) { 953 unsigned long offset; 954 955 if (addr != 0) 956 return (unsigned long) -EINVAL; 957 958 if (len > mtd->size || pgoff >= (mtd->size >> PAGE_SHIFT)) 959 return (unsigned long) -EINVAL; 960 961 offset = pgoff << PAGE_SHIFT; 962 if (offset > mtd->size - len) 963 return (unsigned long) -EINVAL; 964 965 return mtd->get_unmapped_area(mtd, len, offset, flags); 966 } 967 968 /* can't map directly */ 969 return (unsigned long) -ENOSYS; 970 } 971 #endif 972 973 /* 974 * set up a mapping for shared memory segments 975 */ 976 static int mtd_mmap(struct file *file, struct vm_area_struct *vma) 977 { 978 #ifdef CONFIG_MMU 979 struct mtd_file_info *mfi = file->private_data; 980 struct mtd_info *mtd = mfi->mtd; 981 struct map_info *map = mtd->priv; 982 unsigned long start; 983 unsigned long off; 984 u32 len; 985 986 if (mtd->type == MTD_RAM || mtd->type == MTD_ROM) { 987 off = vma->vm_pgoff << PAGE_SHIFT; 988 start = map->phys; 989 len = PAGE_ALIGN((start & ~PAGE_MASK) + map->size); 990 start &= PAGE_MASK; 991 if ((vma->vm_end - vma->vm_start + off) > len) 992 return -EINVAL; 993 994 off += start; 995 vma->vm_pgoff = off >> PAGE_SHIFT; 996 vma->vm_flags |= VM_IO | VM_RESERVED; 997 998 #ifdef pgprot_noncached 999 if (file->f_flags & O_DSYNC || off >= __pa(high_memory)) 1000 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); 1001 #endif 1002 if (io_remap_pfn_range(vma, vma->vm_start, off >> PAGE_SHIFT, 1003 vma->vm_end - vma->vm_start, 1004 vma->vm_page_prot)) 1005 return -EAGAIN; 1006 1007 return 0; 1008 } 1009 return -ENOSYS; 1010 #else 1011 return vma->vm_flags & VM_SHARED ? 0 : -ENOSYS; 1012 #endif 1013 } 1014 1015 static const struct file_operations mtd_fops = { 1016 .owner = THIS_MODULE, 1017 .llseek = mtd_lseek, 1018 .read = mtd_read, 1019 .write = mtd_write, 1020 .unlocked_ioctl = mtd_unlocked_ioctl, 1021 #ifdef CONFIG_COMPAT 1022 .compat_ioctl = mtd_compat_ioctl, 1023 #endif 1024 .open = mtd_open, 1025 .release = mtd_close, 1026 .mmap = mtd_mmap, 1027 #ifndef CONFIG_MMU 1028 .get_unmapped_area = mtd_get_unmapped_area, 1029 #endif 1030 }; 1031 1032 static int mtd_inodefs_get_sb(struct file_system_type *fs_type, int flags, 1033 const char *dev_name, void *data, 1034 struct vfsmount *mnt) 1035 { 1036 return get_sb_pseudo(fs_type, "mtd_inode:", NULL, MTD_INODE_FS_MAGIC, 1037 mnt); 1038 } 1039 1040 static struct file_system_type mtd_inodefs_type = { 1041 .name = "mtd_inodefs", 1042 .get_sb = mtd_inodefs_get_sb, 1043 .kill_sb = kill_anon_super, 1044 }; 1045 1046 static void mtdchar_notify_add(struct mtd_info *mtd) 1047 { 1048 } 1049 1050 static void mtdchar_notify_remove(struct mtd_info *mtd) 1051 { 1052 struct inode *mtd_ino = ilookup(mtd_inode_mnt->mnt_sb, mtd->index); 1053 1054 if (mtd_ino) { 1055 /* Destroy the inode if it exists */ 1056 mtd_ino->i_nlink = 0; 1057 iput(mtd_ino); 1058 } 1059 } 1060 1061 static struct mtd_notifier mtdchar_notifier = { 1062 .add = mtdchar_notify_add, 1063 .remove = mtdchar_notify_remove, 1064 }; 1065 1066 static int __init init_mtdchar(void) 1067 { 1068 int ret; 1069 1070 ret = __register_chrdev(MTD_CHAR_MAJOR, 0, 1 << MINORBITS, 1071 "mtd", &mtd_fops); 1072 if (ret < 0) { 1073 pr_notice("Can't allocate major number %d for " 1074 "Memory Technology Devices.\n", MTD_CHAR_MAJOR); 1075 return ret; 1076 } 1077 1078 ret = register_filesystem(&mtd_inodefs_type); 1079 if (ret) { 1080 pr_notice("Can't register mtd_inodefs filesystem: %d\n", ret); 1081 goto err_unregister_chdev; 1082 } 1083 1084 mtd_inode_mnt = kern_mount(&mtd_inodefs_type); 1085 if (IS_ERR(mtd_inode_mnt)) { 1086 ret = PTR_ERR(mtd_inode_mnt); 1087 pr_notice("Error mounting mtd_inodefs filesystem: %d\n", ret); 1088 goto err_unregister_filesystem; 1089 } 1090 register_mtd_user(&mtdchar_notifier); 1091 1092 return ret; 1093 1094 err_unregister_filesystem: 1095 unregister_filesystem(&mtd_inodefs_type); 1096 err_unregister_chdev: 1097 __unregister_chrdev(MTD_CHAR_MAJOR, 0, 1 << MINORBITS, "mtd"); 1098 return ret; 1099 } 1100 1101 static void __exit cleanup_mtdchar(void) 1102 { 1103 unregister_mtd_user(&mtdchar_notifier); 1104 mntput(mtd_inode_mnt); 1105 unregister_filesystem(&mtd_inodefs_type); 1106 __unregister_chrdev(MTD_CHAR_MAJOR, 0, 1 << MINORBITS, "mtd"); 1107 } 1108 1109 module_init(init_mtdchar); 1110 module_exit(cleanup_mtdchar); 1111 1112 MODULE_ALIAS_CHARDEV_MAJOR(MTD_CHAR_MAJOR); 1113 1114 MODULE_LICENSE("GPL"); 1115 MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>"); 1116 MODULE_DESCRIPTION("Direct character-device access to MTD devices"); 1117 MODULE_ALIAS_CHARDEV_MAJOR(MTD_CHAR_MAJOR); 1118