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 __user *arg) 502{ 503 struct blkpg_ioctl_arg a; 504 struct blkpg_partition p; 505 506 if (!capable(CAP_SYS_ADMIN)) 507 return -EPERM; 508 509 if (copy_from_user(&a, arg, sizeof(struct blkpg_ioctl_arg))) 510 return -EFAULT; 511 512 if (copy_from_user(&p, a.data, sizeof(struct blkpg_partition))) 513 return -EFAULT; 514 515 switch (a.op) { 516 case BLKPG_ADD_PARTITION: 517 518 /* Only master mtd device must be used to add partitions */ 519 if (mtd_is_partition(mtd)) 520 return -EINVAL; 521 522 /* Sanitize user input */ 523 p.devname[BLKPG_DEVNAMELTH - 1] = '\0'; 524 525 return mtd_add_partition(mtd, p.devname, p.start, p.length); 526 527 case BLKPG_DEL_PARTITION: 528 529 if (p.pno < 0) 530 return -EINVAL; 531 532 return mtd_del_partition(mtd, p.pno); 533 534 default: 535 return -EINVAL; 536 } 537} 538 539static int mtdchar_write_ioctl(struct mtd_info *mtd, 540 struct mtd_write_req __user *argp) 541{ 542 struct mtd_write_req req; 543 struct mtd_oob_ops ops; 544 const void __user *usr_data, *usr_oob; 545 int ret; 546 547 if (copy_from_user(&req, argp, sizeof(req))) 548 return -EFAULT; 549 550 usr_data = (const void __user *)(uintptr_t)req.usr_data; 551 usr_oob = (const void __user *)(uintptr_t)req.usr_oob; 552 if (!access_ok(VERIFY_READ, usr_data, req.len) || 553 !access_ok(VERIFY_READ, usr_oob, req.ooblen)) 554 return -EFAULT; 555 556 if (!mtd->_write_oob) 557 return -EOPNOTSUPP; 558 559 ops.mode = req.mode; 560 ops.len = (size_t)req.len; 561 ops.ooblen = (size_t)req.ooblen; 562 ops.ooboffs = 0; 563 564 if (usr_data) { 565 ops.datbuf = memdup_user(usr_data, ops.len); 566 if (IS_ERR(ops.datbuf)) 567 return PTR_ERR(ops.datbuf); 568 } else { 569 ops.datbuf = NULL; 570 } 571 572 if (usr_oob) { 573 ops.oobbuf = memdup_user(usr_oob, ops.ooblen); 574 if (IS_ERR(ops.oobbuf)) { 575 kfree(ops.datbuf); 576 return PTR_ERR(ops.oobbuf); 577 } 578 } else { 579 ops.oobbuf = NULL; 580 } 581 582 ret = mtd_write_oob(mtd, (loff_t)req.start, &ops); 583 584 kfree(ops.datbuf); 585 kfree(ops.oobbuf); 586 587 return ret; 588} 589 590static int mtdchar_ioctl(struct file *file, u_int cmd, u_long arg) 591{ 592 struct mtd_file_info *mfi = file->private_data; 593 struct mtd_info *mtd = mfi->mtd; 594 void __user *argp = (void __user *)arg; 595 int ret = 0; 596 u_long size; 597 struct mtd_info_user info; 598 599 pr_debug("MTD_ioctl\n"); 600 601 size = (cmd & IOCSIZE_MASK) >> IOCSIZE_SHIFT; 602 if (cmd & IOC_IN) { 603 if (!access_ok(VERIFY_READ, argp, size)) 604 return -EFAULT; 605 } 606 if (cmd & IOC_OUT) { 607 if (!access_ok(VERIFY_WRITE, argp, size)) 608 return -EFAULT; 609 } 610 611 switch (cmd) { 612 case MEMGETREGIONCOUNT: 613 if (copy_to_user(argp, &(mtd->numeraseregions), sizeof(int))) 614 return -EFAULT; 615 break; 616 617 case MEMGETREGIONINFO: 618 { 619 uint32_t ur_idx; 620 struct mtd_erase_region_info *kr; 621 struct region_info_user __user *ur = argp; 622 623 if (get_user(ur_idx, &(ur->regionindex))) 624 return -EFAULT; 625 626 if (ur_idx >= mtd->numeraseregions) 627 return -EINVAL; 628 629 kr = &(mtd->eraseregions[ur_idx]); 630 631 if (put_user(kr->offset, &(ur->offset)) 632 || put_user(kr->erasesize, &(ur->erasesize)) 633 || put_user(kr->numblocks, &(ur->numblocks))) 634 return -EFAULT; 635 636 break; 637 } 638 639 case MEMGETINFO: 640 memset(&info, 0, sizeof(info)); 641 info.type = mtd->type; 642 info.flags = mtd->flags; 643 info.size = mtd->size; 644 info.erasesize = mtd->erasesize; 645 info.writesize = mtd->writesize; 646 info.oobsize = mtd->oobsize; 647 /* The below field is obsolete */ 648 info.padding = 0; 649 if (copy_to_user(argp, &info, sizeof(struct mtd_info_user))) 650 return -EFAULT; 651 break; 652 653 case MEMERASE: 654 case MEMERASE64: 655 { 656 struct erase_info *erase; 657 658 if(!(file->f_mode & FMODE_WRITE)) 659 return -EPERM; 660 661 erase=kzalloc(sizeof(struct erase_info),GFP_KERNEL); 662 if (!erase) 663 ret = -ENOMEM; 664 else { 665 wait_queue_head_t waitq; 666 DECLARE_WAITQUEUE(wait, current); 667 668 init_waitqueue_head(&waitq); 669 670 if (cmd == MEMERASE64) { 671 struct erase_info_user64 einfo64; 672 673 if (copy_from_user(&einfo64, argp, 674 sizeof(struct erase_info_user64))) { 675 kfree(erase); 676 return -EFAULT; 677 } 678 erase->addr = einfo64.start; 679 erase->len = einfo64.length; 680 } else { 681 struct erase_info_user einfo32; 682 683 if (copy_from_user(&einfo32, argp, 684 sizeof(struct erase_info_user))) { 685 kfree(erase); 686 return -EFAULT; 687 } 688 erase->addr = einfo32.start; 689 erase->len = einfo32.length; 690 } 691 erase->mtd = mtd; 692 erase->callback = mtdchar_erase_callback; 693 erase->priv = (unsigned long)&waitq; 694 695 /* 696 FIXME: Allow INTERRUPTIBLE. Which means 697 not having the wait_queue head on the stack. 698 699 If the wq_head is on the stack, and we 700 leave because we got interrupted, then the 701 wq_head is no longer there when the 702 callback routine tries to wake us up. 703 */ 704 ret = mtd_erase(mtd, erase); 705 if (!ret) { 706 set_current_state(TASK_UNINTERRUPTIBLE); 707 add_wait_queue(&waitq, &wait); 708 if (erase->state != MTD_ERASE_DONE && 709 erase->state != MTD_ERASE_FAILED) 710 schedule(); 711 remove_wait_queue(&waitq, &wait); 712 set_current_state(TASK_RUNNING); 713 714 ret = (erase->state == MTD_ERASE_FAILED)?-EIO:0; 715 } 716 kfree(erase); 717 } 718 break; 719 } 720 721 case MEMWRITEOOB: 722 { 723 struct mtd_oob_buf buf; 724 struct mtd_oob_buf __user *buf_user = argp; 725 726 /* NOTE: writes return length to buf_user->length */ 727 if (copy_from_user(&buf, argp, sizeof(buf))) 728 ret = -EFAULT; 729 else 730 ret = mtdchar_writeoob(file, mtd, buf.start, buf.length, 731 buf.ptr, &buf_user->length); 732 break; 733 } 734 735 case MEMREADOOB: 736 { 737 struct mtd_oob_buf buf; 738 struct mtd_oob_buf __user *buf_user = argp; 739 740 /* NOTE: writes return length to buf_user->start */ 741 if (copy_from_user(&buf, argp, sizeof(buf))) 742 ret = -EFAULT; 743 else 744 ret = mtdchar_readoob(file, mtd, buf.start, buf.length, 745 buf.ptr, &buf_user->start); 746 break; 747 } 748 749 case MEMWRITEOOB64: 750 { 751 struct mtd_oob_buf64 buf; 752 struct mtd_oob_buf64 __user *buf_user = argp; 753 754 if (copy_from_user(&buf, argp, sizeof(buf))) 755 ret = -EFAULT; 756 else 757 ret = mtdchar_writeoob(file, mtd, buf.start, buf.length, 758 (void __user *)(uintptr_t)buf.usr_ptr, 759 &buf_user->length); 760 break; 761 } 762 763 case MEMREADOOB64: 764 { 765 struct mtd_oob_buf64 buf; 766 struct mtd_oob_buf64 __user *buf_user = argp; 767 768 if (copy_from_user(&buf, argp, sizeof(buf))) 769 ret = -EFAULT; 770 else 771 ret = mtdchar_readoob(file, mtd, buf.start, buf.length, 772 (void __user *)(uintptr_t)buf.usr_ptr, 773 &buf_user->length); 774 break; 775 } 776 777 case MEMWRITE: 778 { 779 ret = mtdchar_write_ioctl(mtd, 780 (struct mtd_write_req __user *)arg); 781 break; 782 } 783 784 case MEMLOCK: 785 { 786 struct erase_info_user einfo; 787 788 if (copy_from_user(&einfo, argp, sizeof(einfo))) 789 return -EFAULT; 790 791 ret = mtd_lock(mtd, einfo.start, einfo.length); 792 break; 793 } 794 795 case MEMUNLOCK: 796 { 797 struct erase_info_user einfo; 798 799 if (copy_from_user(&einfo, argp, sizeof(einfo))) 800 return -EFAULT; 801 802 ret = mtd_unlock(mtd, einfo.start, einfo.length); 803 break; 804 } 805 806 case MEMISLOCKED: 807 { 808 struct erase_info_user einfo; 809 810 if (copy_from_user(&einfo, argp, sizeof(einfo))) 811 return -EFAULT; 812 813 ret = mtd_is_locked(mtd, einfo.start, einfo.length); 814 break; 815 } 816 817 /* Legacy interface */ 818 case MEMGETOOBSEL: 819 { 820 struct nand_oobinfo oi; 821 822 if (!mtd->ecclayout) 823 return -EOPNOTSUPP; 824 if (mtd->ecclayout->eccbytes > ARRAY_SIZE(oi.eccpos)) 825 return -EINVAL; 826 827 oi.useecc = MTD_NANDECC_AUTOPLACE; 828 memcpy(&oi.eccpos, mtd->ecclayout->eccpos, sizeof(oi.eccpos)); 829 memcpy(&oi.oobfree, mtd->ecclayout->oobfree, 830 sizeof(oi.oobfree)); 831 oi.eccbytes = mtd->ecclayout->eccbytes; 832 833 if (copy_to_user(argp, &oi, sizeof(struct nand_oobinfo))) 834 return -EFAULT; 835 break; 836 } 837 838 case MEMGETBADBLOCK: 839 { 840 loff_t offs; 841 842 if (copy_from_user(&offs, argp, sizeof(loff_t))) 843 return -EFAULT; 844 return mtd_block_isbad(mtd, offs); 845 break; 846 } 847 848 case MEMSETBADBLOCK: 849 { 850 loff_t offs; 851 852 if (copy_from_user(&offs, argp, sizeof(loff_t))) 853 return -EFAULT; 854 return mtd_block_markbad(mtd, offs); 855 break; 856 } 857 858 case OTPSELECT: 859 { 860 int mode; 861 if (copy_from_user(&mode, argp, sizeof(int))) 862 return -EFAULT; 863 864 mfi->mode = MTD_FILE_MODE_NORMAL; 865 866 ret = otp_select_filemode(mfi, mode); 867 868 file->f_pos = 0; 869 break; 870 } 871 872 case OTPGETREGIONCOUNT: 873 case OTPGETREGIONINFO: 874 { 875 struct otp_info *buf = kmalloc(4096, GFP_KERNEL); 876 size_t retlen; 877 if (!buf) 878 return -ENOMEM; 879 switch (mfi->mode) { 880 case MTD_FILE_MODE_OTP_FACTORY: 881 ret = mtd_get_fact_prot_info(mtd, 4096, &retlen, buf); 882 break; 883 case MTD_FILE_MODE_OTP_USER: 884 ret = mtd_get_user_prot_info(mtd, 4096, &retlen, buf); 885 break; 886 default: 887 ret = -EINVAL; 888 break; 889 } 890 if (!ret) { 891 if (cmd == OTPGETREGIONCOUNT) { 892 int nbr = retlen / sizeof(struct otp_info); 893 ret = copy_to_user(argp, &nbr, sizeof(int)); 894 } else 895 ret = copy_to_user(argp, buf, retlen); 896 if (ret) 897 ret = -EFAULT; 898 } 899 kfree(buf); 900 break; 901 } 902 903 case OTPLOCK: 904 { 905 struct otp_info oinfo; 906 907 if (mfi->mode != MTD_FILE_MODE_OTP_USER) 908 return -EINVAL; 909 if (copy_from_user(&oinfo, argp, sizeof(oinfo))) 910 return -EFAULT; 911 ret = mtd_lock_user_prot_reg(mtd, oinfo.start, oinfo.length); 912 break; 913 } 914 915 /* This ioctl is being deprecated - it truncates the ECC layout */ 916 case ECCGETLAYOUT: 917 { 918 struct nand_ecclayout_user *usrlay; 919 920 if (!mtd->ecclayout) 921 return -EOPNOTSUPP; 922 923 usrlay = kmalloc(sizeof(*usrlay), GFP_KERNEL); 924 if (!usrlay) 925 return -ENOMEM; 926 927 shrink_ecclayout(mtd->ecclayout, usrlay); 928 929 if (copy_to_user(argp, usrlay, sizeof(*usrlay))) 930 ret = -EFAULT; 931 kfree(usrlay); 932 break; 933 } 934 935 case ECCGETSTATS: 936 { 937 if (copy_to_user(argp, &mtd->ecc_stats, 938 sizeof(struct mtd_ecc_stats))) 939 return -EFAULT; 940 break; 941 } 942 943 case MTDFILEMODE: 944 { 945 mfi->mode = 0; 946 947 switch(arg) { 948 case MTD_FILE_MODE_OTP_FACTORY: 949 case MTD_FILE_MODE_OTP_USER: 950 ret = otp_select_filemode(mfi, arg); 951 break; 952 953 case MTD_FILE_MODE_RAW: 954 if (!mtd_has_oob(mtd)) 955 return -EOPNOTSUPP; 956 mfi->mode = arg; 957 958 case MTD_FILE_MODE_NORMAL: 959 break; 960 default: 961 ret = -EINVAL; 962 } 963 file->f_pos = 0; 964 break; 965 } 966 967 case BLKPG: 968 { 969 ret = mtdchar_blkpg_ioctl(mtd, 970 (struct blkpg_ioctl_arg __user *)arg); 971 break; 972 } 973 974 case BLKRRPART: 975 { 976 /* No reread partition feature. Just return ok */ 977 ret = 0; 978 break; 979 } 980 981 default: 982 ret = -ENOTTY; 983 } 984 985 return ret; 986} /* memory_ioctl */ 987 988static long mtdchar_unlocked_ioctl(struct file *file, u_int cmd, u_long arg) 989{ 990 int ret; 991 992 mutex_lock(&mtd_mutex); 993 ret = mtdchar_ioctl(file, cmd, arg); 994 mutex_unlock(&mtd_mutex); 995 996 return ret; 997} 998 999#ifdef CONFIG_COMPAT 1000 1001struct mtd_oob_buf32 { 1002 u_int32_t start; 1003 u_int32_t length; 1004 compat_caddr_t ptr; /* unsigned char* */ 1005}; 1006 1007#define MEMWRITEOOB32 _IOWR('M', 3, struct mtd_oob_buf32) 1008#define MEMREADOOB32 _IOWR('M', 4, struct mtd_oob_buf32) 1009 1010static long mtdchar_compat_ioctl(struct file *file, unsigned int cmd, 1011 unsigned long arg) 1012{ 1013 struct mtd_file_info *mfi = file->private_data; 1014 struct mtd_info *mtd = mfi->mtd; 1015 void __user *argp = compat_ptr(arg); 1016 int ret = 0; 1017 1018 mutex_lock(&mtd_mutex); 1019 1020 switch (cmd) { 1021 case MEMWRITEOOB32: 1022 { 1023 struct mtd_oob_buf32 buf; 1024 struct mtd_oob_buf32 __user *buf_user = argp; 1025 1026 if (copy_from_user(&buf, argp, sizeof(buf))) 1027 ret = -EFAULT; 1028 else 1029 ret = mtdchar_writeoob(file, mtd, buf.start, 1030 buf.length, compat_ptr(buf.ptr), 1031 &buf_user->length); 1032 break; 1033 } 1034 1035 case MEMREADOOB32: 1036 { 1037 struct mtd_oob_buf32 buf; 1038 struct mtd_oob_buf32 __user *buf_user = argp; 1039 1040 /* NOTE: writes return length to buf->start */ 1041 if (copy_from_user(&buf, argp, sizeof(buf))) 1042 ret = -EFAULT; 1043 else 1044 ret = mtdchar_readoob(file, mtd, buf.start, 1045 buf.length, compat_ptr(buf.ptr), 1046 &buf_user->start); 1047 break; 1048 } 1049 default: 1050 ret = mtdchar_ioctl(file, cmd, (unsigned long)argp); 1051 } 1052 1053 mutex_unlock(&mtd_mutex); 1054 1055 return ret; 1056} 1057 1058#endif /* CONFIG_COMPAT */ 1059 1060/* 1061 * try to determine where a shared mapping can be made 1062 * - only supported for NOMMU at the moment (MMU can't doesn't copy private 1063 * mappings) 1064 */ 1065#ifndef CONFIG_MMU 1066static unsigned long mtdchar_get_unmapped_area(struct file *file, 1067 unsigned long addr, 1068 unsigned long len, 1069 unsigned long pgoff, 1070 unsigned long flags) 1071{ 1072 struct mtd_file_info *mfi = file->private_data; 1073 struct mtd_info *mtd = mfi->mtd; 1074 unsigned long offset; 1075 int ret; 1076 1077 if (addr != 0) 1078 return (unsigned long) -EINVAL; 1079 1080 if (len > mtd->size || pgoff >= (mtd->size >> PAGE_SHIFT)) 1081 return (unsigned long) -EINVAL; 1082 1083 offset = pgoff << PAGE_SHIFT; 1084 if (offset > mtd->size - len) 1085 return (unsigned long) -EINVAL; 1086 1087 ret = mtd_get_unmapped_area(mtd, len, offset, flags); 1088 return ret == -EOPNOTSUPP ? -ENODEV : ret; 1089} 1090 1091static unsigned mtdchar_mmap_capabilities(struct file *file) 1092{ 1093 struct mtd_file_info *mfi = file->private_data; 1094 1095 return mtd_mmap_capabilities(mfi->mtd); 1096} 1097#endif 1098 1099/* 1100 * set up a mapping for shared memory segments 1101 */ 1102static int mtdchar_mmap(struct file *file, struct vm_area_struct *vma) 1103{ 1104#ifdef CONFIG_MMU 1105 struct mtd_file_info *mfi = file->private_data; 1106 struct mtd_info *mtd = mfi->mtd; 1107 struct map_info *map = mtd->priv; 1108 1109 /* This is broken because it assumes the MTD device is map-based 1110 and that mtd->priv is a valid struct map_info. It should be 1111 replaced with something that uses the mtd_get_unmapped_area() 1112 operation properly. */ 1113 if (0 /*mtd->type == MTD_RAM || mtd->type == MTD_ROM*/) { 1114#ifdef pgprot_noncached 1115 if (file->f_flags & O_DSYNC || map->phys >= __pa(high_memory)) 1116 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); 1117#endif 1118 return vm_iomap_memory(vma, map->phys, map->size); 1119 } 1120 return -ENODEV; 1121#else 1122 return vma->vm_flags & VM_SHARED ? 0 : -EACCES; 1123#endif 1124} 1125 1126static const struct file_operations mtd_fops = { 1127 .owner = THIS_MODULE, 1128 .llseek = mtdchar_lseek, 1129 .read = mtdchar_read, 1130 .write = mtdchar_write, 1131 .unlocked_ioctl = mtdchar_unlocked_ioctl, 1132#ifdef CONFIG_COMPAT 1133 .compat_ioctl = mtdchar_compat_ioctl, 1134#endif 1135 .open = mtdchar_open, 1136 .release = mtdchar_close, 1137 .mmap = mtdchar_mmap, 1138#ifndef CONFIG_MMU 1139 .get_unmapped_area = mtdchar_get_unmapped_area, 1140 .mmap_capabilities = mtdchar_mmap_capabilities, 1141#endif 1142}; 1143 1144int __init init_mtdchar(void) 1145{ 1146 int ret; 1147 1148 ret = __register_chrdev(MTD_CHAR_MAJOR, 0, 1 << MINORBITS, 1149 "mtd", &mtd_fops); 1150 if (ret < 0) { 1151 pr_err("Can't allocate major number %d for MTD\n", 1152 MTD_CHAR_MAJOR); 1153 return ret; 1154 } 1155 1156 return ret; 1157} 1158 1159void __exit cleanup_mtdchar(void) 1160{ 1161 __unregister_chrdev(MTD_CHAR_MAJOR, 0, 1 << MINORBITS, "mtd"); 1162} 1163 1164MODULE_ALIAS_CHARDEV_MAJOR(MTD_CHAR_MAJOR); 1165