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 enum mtd_file_modes mode; 53}; 54 55static loff_t mtdchar_lseek(struct file *file, loff_t offset, int orig) 56{ 57 struct mtd_file_info *mfi = file->private_data; 58 return fixed_size_llseek(file, offset, orig, mfi->mtd->size); 59} 60 61static int mtdchar_open(struct inode *inode, struct file *file) 62{ 63 int minor = iminor(inode); 64 int devnum = minor >> 1; 65 int ret = 0; 66 struct mtd_info *mtd; 67 struct mtd_file_info *mfi; 68 69 pr_debug("MTD_open\n"); 70 71 /* You can't open the RO devices RW */ 72 if ((file->f_mode & FMODE_WRITE) && (minor & 1)) 73 return -EACCES; 74 75 mutex_lock(&mtd_mutex); 76 mtd = get_mtd_device(NULL, devnum); 77 78 if (IS_ERR(mtd)) { 79 ret = PTR_ERR(mtd); 80 goto out; 81 } 82 83 if (mtd->type == MTD_ABSENT) { 84 ret = -ENODEV; 85 goto out1; 86 } 87 88 /* You can't open it RW if it's not a writeable device */ 89 if ((file->f_mode & FMODE_WRITE) && !(mtd->flags & MTD_WRITEABLE)) { 90 ret = -EACCES; 91 goto out1; 92 } 93 94 mfi = kzalloc(sizeof(*mfi), GFP_KERNEL); 95 if (!mfi) { 96 ret = -ENOMEM; 97 goto out1; 98 } 99 mfi->mtd = mtd; 100 file->private_data = mfi; 101 mutex_unlock(&mtd_mutex); 102 return 0; 103 104out1: 105 put_mtd_device(mtd); 106out: 107 mutex_unlock(&mtd_mutex); 108 return ret; 109} /* mtdchar_open */ 110 111/*====================================================================*/ 112 113static int mtdchar_close(struct inode *inode, struct file *file) 114{ 115 struct mtd_file_info *mfi = file->private_data; 116 struct mtd_info *mtd = mfi->mtd; 117 118 pr_debug("MTD_close\n"); 119 120 /* Only sync if opened RW */ 121 if ((file->f_mode & FMODE_WRITE)) 122 mtd_sync(mtd); 123 124 put_mtd_device(mtd); 125 file->private_data = NULL; 126 kfree(mfi); 127 128 return 0; 129} /* mtdchar_close */ 130 131/* 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 */ 148 149static ssize_t mtdchar_read(struct file *file, char __user *buf, size_t count, 150 loff_t *ppos) 151{ 152 struct mtd_file_info *mfi = file->private_data; 153 struct mtd_info *mtd = mfi->mtd; 154 size_t retlen; 155 size_t total_retlen=0; 156 int ret=0; 157 int len; 158 size_t size = count; 159 char *kbuf; 160 161 pr_debug("MTD_read\n"); 162 163 if (*ppos + count > mtd->size) 164 count = mtd->size - *ppos; 165 166 if (!count) 167 return 0; 168 169 kbuf = mtd_kmalloc_up_to(mtd, &size); 170 if (!kbuf) 171 return -ENOMEM; 172 173 while (count) { 174 len = min_t(size_t, count, size); 175 176 switch (mfi->mode) { 177 case MTD_FILE_MODE_OTP_FACTORY: 178 ret = mtd_read_fact_prot_reg(mtd, *ppos, len, 179 &retlen, kbuf); 180 break; 181 case MTD_FILE_MODE_OTP_USER: 182 ret = mtd_read_user_prot_reg(mtd, *ppos, len, 183 &retlen, kbuf); 184 break; 185 case MTD_FILE_MODE_RAW: 186 { 187 struct mtd_oob_ops ops; 188 189 ops.mode = MTD_OPS_RAW; 190 ops.datbuf = kbuf; 191 ops.oobbuf = NULL; 192 ops.len = len; 193 194 ret = mtd_read_oob(mtd, *ppos, &ops); 195 retlen = ops.retlen; 196 break; 197 } 198 default: 199 ret = mtd_read(mtd, *ppos, len, &retlen, kbuf); 200 } 201 /* Nand returns -EBADMSG on ECC errors, but it returns 202 * the data. For our userspace tools it is important 203 * to dump areas with ECC errors! 204 * For kernel internal usage it also might return -EUCLEAN 205 * to signal the caller that a bitflip has occurred and has 206 * been corrected by the ECC algorithm. 207 * Userspace software which accesses NAND this way 208 * must be aware of the fact that it deals with NAND 209 */ 210 if (!ret || mtd_is_bitflip_or_eccerr(ret)) { 211 *ppos += retlen; 212 if (copy_to_user(buf, kbuf, retlen)) { 213 kfree(kbuf); 214 return -EFAULT; 215 } 216 else 217 total_retlen += retlen; 218 219 count -= retlen; 220 buf += retlen; 221 if (retlen == 0) 222 count = 0; 223 } 224 else { 225 kfree(kbuf); 226 return ret; 227 } 228 229 } 230 231 kfree(kbuf); 232 return total_retlen; 233} /* mtdchar_read */ 234 235static ssize_t mtdchar_write(struct file *file, const char __user *buf, size_t count, 236 loff_t *ppos) 237{ 238 struct mtd_file_info *mfi = file->private_data; 239 struct mtd_info *mtd = mfi->mtd; 240 size_t size = count; 241 char *kbuf; 242 size_t retlen; 243 size_t total_retlen=0; 244 int ret=0; 245 int len; 246 247 pr_debug("MTD_write\n"); 248 249 if (*ppos == mtd->size) 250 return -ENOSPC; 251 252 if (*ppos + count > mtd->size) 253 count = mtd->size - *ppos; 254 255 if (!count) 256 return 0; 257 258 kbuf = mtd_kmalloc_up_to(mtd, &size); 259 if (!kbuf) 260 return -ENOMEM; 261 262 while (count) { 263 len = min_t(size_t, count, size); 264 265 if (copy_from_user(kbuf, buf, len)) { 266 kfree(kbuf); 267 return -EFAULT; 268 } 269 270 switch (mfi->mode) { 271 case MTD_FILE_MODE_OTP_FACTORY: 272 ret = -EROFS; 273 break; 274 case MTD_FILE_MODE_OTP_USER: 275 ret = mtd_write_user_prot_reg(mtd, *ppos, len, 276 &retlen, kbuf); 277 break; 278 279 case MTD_FILE_MODE_RAW: 280 { 281 struct mtd_oob_ops ops; 282 283 ops.mode = MTD_OPS_RAW; 284 ops.datbuf = kbuf; 285 ops.oobbuf = NULL; 286 ops.ooboffs = 0; 287 ops.len = len; 288 289 ret = mtd_write_oob(mtd, *ppos, &ops); 290 retlen = ops.retlen; 291 break; 292 } 293 294 default: 295 ret = mtd_write(mtd, *ppos, len, &retlen, kbuf); 296 } 297 298 /* 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; 305 306 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 } 316 } 317 318 kfree(kbuf); 319 return total_retlen; 320} /* mtdchar_write */ 321 322/*====================================================================== 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 332static int otp_select_filemode(struct mtd_file_info *mfi, int mode) 333{ 334 struct mtd_info *mtd = mfi->mtd; 335 size_t retlen; 336 337 switch (mode) { 338 case MTD_OTP_FACTORY: 339 if (mtd_read_fact_prot_reg(mtd, -1, 0, &retlen, NULL) == 340 -EOPNOTSUPP) 341 return -EOPNOTSUPP; 342 343 mfi->mode = MTD_FILE_MODE_OTP_FACTORY; 344 break; 345 case MTD_OTP_USER: 346 if (mtd_read_user_prot_reg(mtd, -1, 0, &retlen, NULL) == 347 -EOPNOTSUPP) 348 return -EOPNOTSUPP; 349 350 mfi->mode = MTD_FILE_MODE_OTP_USER; 351 break; 352 case MTD_OTP_OFF: 353 mfi->mode = MTD_FILE_MODE_NORMAL; 354 break; 355 default: 356 return -EINVAL; 357 } 358 359 return 0; 360} 361 362static int mtdchar_writeoob(struct file *file, struct mtd_info *mtd, 363 uint64_t start, uint32_t length, void __user *ptr, 364 uint32_t __user *retp) 365{ 366 struct mtd_file_info *mfi = file->private_data; 367 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; 376 377 if (!mtd->_write_oob) 378 ret = -EOPNOTSUPP; 379 else 380 ret = access_ok(VERIFY_READ, ptr, length) ? 0 : -EFAULT; 381 382 if (ret) 383 return ret; 384 385 ops.ooblen = length; 386 ops.ooboffs = start & (mtd->writesize - 1); 387 ops.datbuf = NULL; 388 ops.mode = (mfi->mode == MTD_FILE_MODE_RAW) ? MTD_OPS_RAW : 389 MTD_OPS_PLACE_OOB; 390 391 if (ops.ooboffs && ops.ooblen > (mtd->oobsize - ops.ooboffs)) 392 return -EINVAL; 393 394 ops.oobbuf = memdup_user(ptr, length); 395 if (IS_ERR(ops.oobbuf)) 396 return PTR_ERR(ops.oobbuf); 397 398 start &= ~((uint64_t)mtd->writesize - 1); 399 ret = mtd_write_oob(mtd, start, &ops); 400 401 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 411static int mtdchar_readoob(struct file *file, struct mtd_info *mtd, 412 uint64_t start, uint32_t length, void __user *ptr, 413 uint32_t __user *retp) 414{ 415 struct mtd_file_info *mfi = file->private_data; 416 struct mtd_oob_ops ops; 417 int ret = 0; 418 419 if (length > 4096) 420 return -EINVAL; 421 422 if (!access_ok(VERIFY_WRITE, ptr, length)) 423 return -EFAULT; 424 425 ops.ooblen = length; 426 ops.ooboffs = start & (mtd->writesize - 1); 427 ops.datbuf = NULL; 428 ops.mode = (mfi->mode == MTD_FILE_MODE_RAW) ? MTD_OPS_RAW : 429 MTD_OPS_PLACE_OOB; 430 431 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; 437 438 start &= ~((uint64_t)mtd->writesize - 1); 439 ret = mtd_read_oob(mtd, start, &ops); 440 441 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); 448 449 /* 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 * 457 * 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. 460 */ 461 if (mtd_is_bitflip_or_eccerr(ret)) 462 return 0; 463 464 return ret; 465} 466 467/* 468 * Copies (and truncates, if necessary) data from the larger struct, 469 * nand_ecclayout, to the smaller, deprecated layout struct, 470 * nand_ecclayout_user. This is necessary only to support the deprecated 471 * API ioctl ECCGETLAYOUT while allowing all new functionality to use 472 * nand_ecclayout flexibly (i.e. the struct may change size in new 473 * releases without requiring major rewrites). 474 */ 475static int shrink_ecclayout(const struct nand_ecclayout *from, 476 struct nand_ecclayout_user *to) 477{ 478 int i; 479 480 if (!from || !to) 481 return -EINVAL; 482 483 memset(to, 0, sizeof(*to)); 484 485 to->eccbytes = min((int)from->eccbytes, MTD_MAX_ECCPOS_ENTRIES); 486 for (i = 0; i < to->eccbytes; i++) 487 to->eccpos[i] = from->eccpos[i]; 488 489 for (i = 0; i < MTD_MAX_OOBFREE_ENTRIES; i++) { 490 if (from->oobfree[i].length == 0 && 491 from->oobfree[i].offset == 0) 492 break; 493 to->oobavail += from->oobfree[i].length; 494 to->oobfree[i] = from->oobfree[i]; 495 } 496 497 return 0; 498} 499 500static int mtdchar_blkpg_ioctl(struct mtd_info *mtd, 501 struct blkpg_ioctl_arg *arg) 502{ 503 struct blkpg_partition p; 504 505 if (!capable(CAP_SYS_ADMIN)) 506 return -EPERM; 507 508 if (copy_from_user(&p, arg->data, sizeof(p))) 509 return -EFAULT; 510 511 switch (arg->op) { 512 case BLKPG_ADD_PARTITION: 513 514 /* Only master mtd device must be used to add partitions */ 515 if (mtd_is_partition(mtd)) 516 return -EINVAL; 517 518 /* Sanitize user input */ 519 p.devname[BLKPG_DEVNAMELTH - 1] = '\0'; 520 521 return mtd_add_partition(mtd, p.devname, p.start, p.length); 522 523 case BLKPG_DEL_PARTITION: 524 525 if (p.pno < 0) 526 return -EINVAL; 527 528 return mtd_del_partition(mtd, p.pno); 529 530 default: 531 return -EINVAL; 532 } 533} 534 535static int mtdchar_write_ioctl(struct mtd_info *mtd, 536 struct mtd_write_req __user *argp) 537{ 538 struct mtd_write_req req; 539 struct mtd_oob_ops ops; 540 const void __user *usr_data, *usr_oob; 541 int ret; 542 543 if (copy_from_user(&req, argp, sizeof(req))) 544 return -EFAULT; 545 546 usr_data = (const void __user *)(uintptr_t)req.usr_data; 547 usr_oob = (const void __user *)(uintptr_t)req.usr_oob; 548 if (!access_ok(VERIFY_READ, usr_data, req.len) || 549 !access_ok(VERIFY_READ, usr_oob, req.ooblen)) 550 return -EFAULT; 551 552 if (!mtd->_write_oob) 553 return -EOPNOTSUPP; 554 555 ops.mode = req.mode; 556 ops.len = (size_t)req.len; 557 ops.ooblen = (size_t)req.ooblen; 558 ops.ooboffs = 0; 559 560 if (usr_data) { 561 ops.datbuf = memdup_user(usr_data, ops.len); 562 if (IS_ERR(ops.datbuf)) 563 return PTR_ERR(ops.datbuf); 564 } else { 565 ops.datbuf = NULL; 566 } 567 568 if (usr_oob) { 569 ops.oobbuf = memdup_user(usr_oob, ops.ooblen); 570 if (IS_ERR(ops.oobbuf)) { 571 kfree(ops.datbuf); 572 return PTR_ERR(ops.oobbuf); 573 } 574 } else { 575 ops.oobbuf = NULL; 576 } 577 578 ret = mtd_write_oob(mtd, (loff_t)req.start, &ops); 579 580 kfree(ops.datbuf); 581 kfree(ops.oobbuf); 582 583 return ret; 584} 585 586static int mtdchar_ioctl(struct file *file, u_int cmd, u_long arg) 587{ 588 struct mtd_file_info *mfi = file->private_data; 589 struct mtd_info *mtd = mfi->mtd; 590 void __user *argp = (void __user *)arg; 591 int ret = 0; 592 u_long size; 593 struct mtd_info_user info; 594 595 pr_debug("MTD_ioctl\n"); 596 597 size = (cmd & IOCSIZE_MASK) >> IOCSIZE_SHIFT; 598 if (cmd & IOC_IN) { 599 if (!access_ok(VERIFY_READ, argp, size)) 600 return -EFAULT; 601 } 602 if (cmd & IOC_OUT) { 603 if (!access_ok(VERIFY_WRITE, argp, size)) 604 return -EFAULT; 605 } 606 607 switch (cmd) { 608 case MEMGETREGIONCOUNT: 609 if (copy_to_user(argp, &(mtd->numeraseregions), sizeof(int))) 610 return -EFAULT; 611 break; 612 613 case MEMGETREGIONINFO: 614 { 615 uint32_t ur_idx; 616 struct mtd_erase_region_info *kr; 617 struct region_info_user __user *ur = argp; 618 619 if (get_user(ur_idx, &(ur->regionindex))) 620 return -EFAULT; 621 622 if (ur_idx >= mtd->numeraseregions) 623 return -EINVAL; 624 625 kr = &(mtd->eraseregions[ur_idx]); 626 627 if (put_user(kr->offset, &(ur->offset)) 628 || put_user(kr->erasesize, &(ur->erasesize)) 629 || put_user(kr->numblocks, &(ur->numblocks))) 630 return -EFAULT; 631 632 break; 633 } 634 635 case MEMGETINFO: 636 memset(&info, 0, sizeof(info)); 637 info.type = mtd->type; 638 info.flags = mtd->flags; 639 info.size = mtd->size; 640 info.erasesize = mtd->erasesize; 641 info.writesize = mtd->writesize; 642 info.oobsize = mtd->oobsize; 643 /* The below field is obsolete */ 644 info.padding = 0; 645 if (copy_to_user(argp, &info, sizeof(struct mtd_info_user))) 646 return -EFAULT; 647 break; 648 649 case MEMERASE: 650 case MEMERASE64: 651 { 652 struct erase_info *erase; 653 654 if(!(file->f_mode & FMODE_WRITE)) 655 return -EPERM; 656 657 erase=kzalloc(sizeof(struct erase_info),GFP_KERNEL); 658 if (!erase) 659 ret = -ENOMEM; 660 else { 661 wait_queue_head_t waitq; 662 DECLARE_WAITQUEUE(wait, current); 663 664 init_waitqueue_head(&waitq); 665 666 if (cmd == MEMERASE64) { 667 struct erase_info_user64 einfo64; 668 669 if (copy_from_user(&einfo64, argp, 670 sizeof(struct erase_info_user64))) { 671 kfree(erase); 672 return -EFAULT; 673 } 674 erase->addr = einfo64.start; 675 erase->len = einfo64.length; 676 } else { 677 struct erase_info_user einfo32; 678 679 if (copy_from_user(&einfo32, argp, 680 sizeof(struct erase_info_user))) { 681 kfree(erase); 682 return -EFAULT; 683 } 684 erase->addr = einfo32.start; 685 erase->len = einfo32.length; 686 } 687 erase->mtd = mtd; 688 erase->callback = mtdchar_erase_callback; 689 erase->priv = (unsigned long)&waitq; 690 691 /* 692 FIXME: Allow INTERRUPTIBLE. Which means 693 not having the wait_queue head on the stack. 694 695 If the wq_head is on the stack, and we 696 leave because we got interrupted, then the 697 wq_head is no longer there when the 698 callback routine tries to wake us up. 699 */ 700 ret = mtd_erase(mtd, erase); 701 if (!ret) { 702 set_current_state(TASK_UNINTERRUPTIBLE); 703 add_wait_queue(&waitq, &wait); 704 if (erase->state != MTD_ERASE_DONE && 705 erase->state != MTD_ERASE_FAILED) 706 schedule(); 707 remove_wait_queue(&waitq, &wait); 708 set_current_state(TASK_RUNNING); 709 710 ret = (erase->state == MTD_ERASE_FAILED)?-EIO:0; 711 } 712 kfree(erase); 713 } 714 break; 715 } 716 717 case MEMWRITEOOB: 718 { 719 struct mtd_oob_buf buf; 720 struct mtd_oob_buf __user *buf_user = argp; 721 722 /* NOTE: writes return length to buf_user->length */ 723 if (copy_from_user(&buf, argp, sizeof(buf))) 724 ret = -EFAULT; 725 else 726 ret = mtdchar_writeoob(file, mtd, buf.start, buf.length, 727 buf.ptr, &buf_user->length); 728 break; 729 } 730 731 case MEMREADOOB: 732 { 733 struct mtd_oob_buf buf; 734 struct mtd_oob_buf __user *buf_user = argp; 735 736 /* NOTE: writes return length to buf_user->start */ 737 if (copy_from_user(&buf, argp, sizeof(buf))) 738 ret = -EFAULT; 739 else 740 ret = mtdchar_readoob(file, mtd, buf.start, buf.length, 741 buf.ptr, &buf_user->start); 742 break; 743 } 744 745 case MEMWRITEOOB64: 746 { 747 struct mtd_oob_buf64 buf; 748 struct mtd_oob_buf64 __user *buf_user = argp; 749 750 if (copy_from_user(&buf, argp, sizeof(buf))) 751 ret = -EFAULT; 752 else 753 ret = mtdchar_writeoob(file, mtd, buf.start, buf.length, 754 (void __user *)(uintptr_t)buf.usr_ptr, 755 &buf_user->length); 756 break; 757 } 758 759 case MEMREADOOB64: 760 { 761 struct mtd_oob_buf64 buf; 762 struct mtd_oob_buf64 __user *buf_user = argp; 763 764 if (copy_from_user(&buf, argp, sizeof(buf))) 765 ret = -EFAULT; 766 else 767 ret = mtdchar_readoob(file, mtd, buf.start, buf.length, 768 (void __user *)(uintptr_t)buf.usr_ptr, 769 &buf_user->length); 770 break; 771 } 772 773 case MEMWRITE: 774 { 775 ret = mtdchar_write_ioctl(mtd, 776 (struct mtd_write_req __user *)arg); 777 break; 778 } 779 780 case MEMLOCK: 781 { 782 struct erase_info_user einfo; 783 784 if (copy_from_user(&einfo, argp, sizeof(einfo))) 785 return -EFAULT; 786 787 ret = mtd_lock(mtd, einfo.start, einfo.length); 788 break; 789 } 790 791 case MEMUNLOCK: 792 { 793 struct erase_info_user einfo; 794 795 if (copy_from_user(&einfo, argp, sizeof(einfo))) 796 return -EFAULT; 797 798 ret = mtd_unlock(mtd, einfo.start, einfo.length); 799 break; 800 } 801 802 case MEMISLOCKED: 803 { 804 struct erase_info_user einfo; 805 806 if (copy_from_user(&einfo, argp, sizeof(einfo))) 807 return -EFAULT; 808 809 ret = mtd_is_locked(mtd, einfo.start, einfo.length); 810 break; 811 } 812 813 /* Legacy interface */ 814 case MEMGETOOBSEL: 815 { 816 struct nand_oobinfo oi; 817 818 if (!mtd->ecclayout) 819 return -EOPNOTSUPP; 820 if (mtd->ecclayout->eccbytes > ARRAY_SIZE(oi.eccpos)) 821 return -EINVAL; 822 823 oi.useecc = MTD_NANDECC_AUTOPLACE; 824 memcpy(&oi.eccpos, mtd->ecclayout->eccpos, sizeof(oi.eccpos)); 825 memcpy(&oi.oobfree, mtd->ecclayout->oobfree, 826 sizeof(oi.oobfree)); 827 oi.eccbytes = mtd->ecclayout->eccbytes; 828 829 if (copy_to_user(argp, &oi, sizeof(struct nand_oobinfo))) 830 return -EFAULT; 831 break; 832 } 833 834 case MEMGETBADBLOCK: 835 { 836 loff_t offs; 837 838 if (copy_from_user(&offs, argp, sizeof(loff_t))) 839 return -EFAULT; 840 return mtd_block_isbad(mtd, offs); 841 break; 842 } 843 844 case MEMSETBADBLOCK: 845 { 846 loff_t offs; 847 848 if (copy_from_user(&offs, argp, sizeof(loff_t))) 849 return -EFAULT; 850 return mtd_block_markbad(mtd, offs); 851 break; 852 } 853 854 case OTPSELECT: 855 { 856 int mode; 857 if (copy_from_user(&mode, argp, sizeof(int))) 858 return -EFAULT; 859 860 mfi->mode = MTD_FILE_MODE_NORMAL; 861 862 ret = otp_select_filemode(mfi, mode); 863 864 file->f_pos = 0; 865 break; 866 } 867 868 case OTPGETREGIONCOUNT: 869 case OTPGETREGIONINFO: 870 { 871 struct otp_info *buf = kmalloc(4096, GFP_KERNEL); 872 size_t retlen; 873 if (!buf) 874 return -ENOMEM; 875 switch (mfi->mode) { 876 case MTD_FILE_MODE_OTP_FACTORY: 877 ret = mtd_get_fact_prot_info(mtd, 4096, &retlen, buf); 878 break; 879 case MTD_FILE_MODE_OTP_USER: 880 ret = mtd_get_user_prot_info(mtd, 4096, &retlen, buf); 881 break; 882 default: 883 ret = -EINVAL; 884 break; 885 } 886 if (!ret) { 887 if (cmd == OTPGETREGIONCOUNT) { 888 int nbr = retlen / sizeof(struct otp_info); 889 ret = copy_to_user(argp, &nbr, sizeof(int)); 890 } else 891 ret = copy_to_user(argp, buf, retlen); 892 if (ret) 893 ret = -EFAULT; 894 } 895 kfree(buf); 896 break; 897 } 898 899 case OTPLOCK: 900 { 901 struct otp_info oinfo; 902 903 if (mfi->mode != MTD_FILE_MODE_OTP_USER) 904 return -EINVAL; 905 if (copy_from_user(&oinfo, argp, sizeof(oinfo))) 906 return -EFAULT; 907 ret = mtd_lock_user_prot_reg(mtd, oinfo.start, oinfo.length); 908 break; 909 } 910 911 /* This ioctl is being deprecated - it truncates the ECC layout */ 912 case ECCGETLAYOUT: 913 { 914 struct nand_ecclayout_user *usrlay; 915 916 if (!mtd->ecclayout) 917 return -EOPNOTSUPP; 918 919 usrlay = kmalloc(sizeof(*usrlay), GFP_KERNEL); 920 if (!usrlay) 921 return -ENOMEM; 922 923 shrink_ecclayout(mtd->ecclayout, usrlay); 924 925 if (copy_to_user(argp, usrlay, sizeof(*usrlay))) 926 ret = -EFAULT; 927 kfree(usrlay); 928 break; 929 } 930 931 case ECCGETSTATS: 932 { 933 if (copy_to_user(argp, &mtd->ecc_stats, 934 sizeof(struct mtd_ecc_stats))) 935 return -EFAULT; 936 break; 937 } 938 939 case MTDFILEMODE: 940 { 941 mfi->mode = 0; 942 943 switch(arg) { 944 case MTD_FILE_MODE_OTP_FACTORY: 945 case MTD_FILE_MODE_OTP_USER: 946 ret = otp_select_filemode(mfi, arg); 947 break; 948 949 case MTD_FILE_MODE_RAW: 950 if (!mtd_has_oob(mtd)) 951 return -EOPNOTSUPP; 952 mfi->mode = arg; 953 954 case MTD_FILE_MODE_NORMAL: 955 break; 956 default: 957 ret = -EINVAL; 958 } 959 file->f_pos = 0; 960 break; 961 } 962 963 case BLKPG: 964 { 965 struct blkpg_ioctl_arg __user *blk_arg = argp; 966 struct blkpg_ioctl_arg a; 967 968 if (copy_from_user(&a, blk_arg, sizeof(a))) 969 ret = -EFAULT; 970 else 971 ret = mtdchar_blkpg_ioctl(mtd, &a); 972 break; 973 } 974 975 case BLKRRPART: 976 { 977 /* No reread partition feature. Just return ok */ 978 ret = 0; 979 break; 980 } 981 982 default: 983 ret = -ENOTTY; 984 } 985 986 return ret; 987} /* memory_ioctl */ 988 989static long mtdchar_unlocked_ioctl(struct file *file, u_int cmd, u_long arg) 990{ 991 int ret; 992 993 mutex_lock(&mtd_mutex); 994 ret = mtdchar_ioctl(file, cmd, arg); 995 mutex_unlock(&mtd_mutex); 996 997 return ret; 998} 999 1000#ifdef CONFIG_COMPAT 1001 1002struct mtd_oob_buf32 { 1003 u_int32_t start; 1004 u_int32_t length; 1005 compat_caddr_t ptr; /* unsigned char* */ 1006}; 1007 1008#define MEMWRITEOOB32 _IOWR('M', 3, struct mtd_oob_buf32) 1009#define MEMREADOOB32 _IOWR('M', 4, struct mtd_oob_buf32) 1010 1011static long mtdchar_compat_ioctl(struct file *file, unsigned int cmd, 1012 unsigned long arg) 1013{ 1014 struct mtd_file_info *mfi = file->private_data; 1015 struct mtd_info *mtd = mfi->mtd; 1016 void __user *argp = compat_ptr(arg); 1017 int ret = 0; 1018 1019 mutex_lock(&mtd_mutex); 1020 1021 switch (cmd) { 1022 case MEMWRITEOOB32: 1023 { 1024 struct mtd_oob_buf32 buf; 1025 struct mtd_oob_buf32 __user *buf_user = argp; 1026 1027 if (copy_from_user(&buf, argp, sizeof(buf))) 1028 ret = -EFAULT; 1029 else 1030 ret = mtdchar_writeoob(file, mtd, buf.start, 1031 buf.length, compat_ptr(buf.ptr), 1032 &buf_user->length); 1033 break; 1034 } 1035 1036 case MEMREADOOB32: 1037 { 1038 struct mtd_oob_buf32 buf; 1039 struct mtd_oob_buf32 __user *buf_user = argp; 1040 1041 /* NOTE: writes return length to buf->start */ 1042 if (copy_from_user(&buf, argp, sizeof(buf))) 1043 ret = -EFAULT; 1044 else 1045 ret = mtdchar_readoob(file, mtd, buf.start, 1046 buf.length, compat_ptr(buf.ptr), 1047 &buf_user->start); 1048 break; 1049 } 1050 1051 case BLKPG: 1052 { 1053 /* Convert from blkpg_compat_ioctl_arg to blkpg_ioctl_arg */ 1054 struct blkpg_compat_ioctl_arg __user *uarg = argp; 1055 struct blkpg_compat_ioctl_arg compat_arg; 1056 struct blkpg_ioctl_arg a; 1057 1058 if (copy_from_user(&compat_arg, uarg, sizeof(compat_arg))) { 1059 ret = -EFAULT; 1060 break; 1061 } 1062 1063 memset(&a, 0, sizeof(a)); 1064 a.op = compat_arg.op; 1065 a.flags = compat_arg.flags; 1066 a.datalen = compat_arg.datalen; 1067 a.data = compat_ptr(compat_arg.data); 1068 1069 ret = mtdchar_blkpg_ioctl(mtd, &a); 1070 break; 1071 } 1072 1073 default: 1074 ret = mtdchar_ioctl(file, cmd, (unsigned long)argp); 1075 } 1076 1077 mutex_unlock(&mtd_mutex); 1078 1079 return ret; 1080} 1081 1082#endif /* CONFIG_COMPAT */ 1083 1084/* 1085 * try to determine where a shared mapping can be made 1086 * - only supported for NOMMU at the moment (MMU can't doesn't copy private 1087 * mappings) 1088 */ 1089#ifndef CONFIG_MMU 1090static unsigned long mtdchar_get_unmapped_area(struct file *file, 1091 unsigned long addr, 1092 unsigned long len, 1093 unsigned long pgoff, 1094 unsigned long flags) 1095{ 1096 struct mtd_file_info *mfi = file->private_data; 1097 struct mtd_info *mtd = mfi->mtd; 1098 unsigned long offset; 1099 int ret; 1100 1101 if (addr != 0) 1102 return (unsigned long) -EINVAL; 1103 1104 if (len > mtd->size || pgoff >= (mtd->size >> PAGE_SHIFT)) 1105 return (unsigned long) -EINVAL; 1106 1107 offset = pgoff << PAGE_SHIFT; 1108 if (offset > mtd->size - len) 1109 return (unsigned long) -EINVAL; 1110 1111 ret = mtd_get_unmapped_area(mtd, len, offset, flags); 1112 return ret == -EOPNOTSUPP ? -ENODEV : ret; 1113} 1114 1115static unsigned mtdchar_mmap_capabilities(struct file *file) 1116{ 1117 struct mtd_file_info *mfi = file->private_data; 1118 1119 return mtd_mmap_capabilities(mfi->mtd); 1120} 1121#endif 1122 1123/* 1124 * set up a mapping for shared memory segments 1125 */ 1126static int mtdchar_mmap(struct file *file, struct vm_area_struct *vma) 1127{ 1128#ifdef CONFIG_MMU 1129 struct mtd_file_info *mfi = file->private_data; 1130 struct mtd_info *mtd = mfi->mtd; 1131 struct map_info *map = mtd->priv; 1132 1133 /* This is broken because it assumes the MTD device is map-based 1134 and that mtd->priv is a valid struct map_info. It should be 1135 replaced with something that uses the mtd_get_unmapped_area() 1136 operation properly. */ 1137 if (0 /*mtd->type == MTD_RAM || mtd->type == MTD_ROM*/) { 1138#ifdef pgprot_noncached 1139 if (file->f_flags & O_DSYNC || map->phys >= __pa(high_memory)) 1140 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); 1141#endif 1142 return vm_iomap_memory(vma, map->phys, map->size); 1143 } 1144 return -ENODEV; 1145#else 1146 return vma->vm_flags & VM_SHARED ? 0 : -EACCES; 1147#endif 1148} 1149 1150static const struct file_operations mtd_fops = { 1151 .owner = THIS_MODULE, 1152 .llseek = mtdchar_lseek, 1153 .read = mtdchar_read, 1154 .write = mtdchar_write, 1155 .unlocked_ioctl = mtdchar_unlocked_ioctl, 1156#ifdef CONFIG_COMPAT 1157 .compat_ioctl = mtdchar_compat_ioctl, 1158#endif 1159 .open = mtdchar_open, 1160 .release = mtdchar_close, 1161 .mmap = mtdchar_mmap, 1162#ifndef CONFIG_MMU 1163 .get_unmapped_area = mtdchar_get_unmapped_area, 1164 .mmap_capabilities = mtdchar_mmap_capabilities, 1165#endif 1166}; 1167 1168int __init init_mtdchar(void) 1169{ 1170 int ret; 1171 1172 ret = __register_chrdev(MTD_CHAR_MAJOR, 0, 1 << MINORBITS, 1173 "mtd", &mtd_fops); 1174 if (ret < 0) { 1175 pr_err("Can't allocate major number %d for MTD\n", 1176 MTD_CHAR_MAJOR); 1177 return ret; 1178 } 1179 1180 return ret; 1181} 1182 1183void __exit cleanup_mtdchar(void) 1184{ 1185 __unregister_chrdev(MTD_CHAR_MAJOR, 0, 1 << MINORBITS, "mtd"); 1186} 1187 1188MODULE_ALIAS_CHARDEV_MAJOR(MTD_CHAR_MAJOR); 1189