/* Copyright 2020 This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see . */ #pragma once #include "config_common.h" /* USB Device descriptor parameter */ #define VENDOR_ID 0xFEED #define PRODUCT_ID 0xB1E5 #define DEVICE_VER 0x0001 #define MANUFACTURER KPrepublic #define PRODUCT Cospad #define DESCRIPTION 6x4 numpad with underglow and backlighting /* key matrix size */ #define MATRIX_ROWS 6 #define MATRIX_COLS 4 /* * Keyboard Matrix Assignments * * Change this to how you wired your keyboard * COLS: AVR pins used for columns, left to right * ROWS: AVR pins used for rows, top to bottom * DIODE_DIRECTION: COL2ROW = COL = Anode (+), ROW = Cathode (-, marked on diode) * ROW2COL = ROW = Anode (+), COL = Cathode (-, marked on diode) * */ #define MATRIX_ROW_PINS { D0, D1, D2, D3, D4, D5 } #define MATRIX_COL_PINS { F0, F1, E6, C7 } #define UNUSED_PINS /* COL2ROW, ROW2COL */ #define DIODE_DIRECTION COL2ROW /* * Split Keyboard specific options, make sure you have 'SPLIT_KEYBOARD = yes' in your rules.mk, and define SOFT_SERIAL_PIN. */ #define SOFT_SERIAL_PIN D0 // or D1, D2, D3, E6 #define BACKLIGHT_PIN F7 // #define BACKLIGHT_BREATHING #define BACKLIGHT_LEVELS 3 #define BACKLIGHT_ON_STATE 0 #define RGB_DI_PIN F6 #ifdef RGB_DI_PIN #define RGBLED_NUM 4 // #define RGBLIGHT_HUE_STEP 8 // #define RGBLIGHT_SAT_STEP 8 // #define RGBLIGHT_VAL_STEP 8 // #define RGBLIGHT_LIMIT_VAL 255 /* The maximum brightness level */ // #define RGBLIGHT_SLEEP /* If defined, the RGB lighting will be switched off when the host goes to sleep */ // /*== all animations enable ==*/ #define RGBLIGHT_ANIMATIONS // /*== or choose animations ==*/ // #define RGBLIGHT_EFFECT_BREATHING // #define RGBLIGHT_EFFECT_RAINBOW_MOOD // #define RGBLIGHT_EFFECT_RAINBOW_SWIRL // #define RGBLIGHT_EFFECT_SNAKE // #define RGBLIGHT_EFFECT_KNIGHT // #define RGBLIGHT_EFFECT_CHRISTMAS // #define RGBLIGHT_EFFECT_STATIC_GRADIENT // #define RGBLIGHT_EFFECT_RGB_TEST // #define RGBLIGHT_EFFECT_ALTERNATING // /*== customize breathing effect ==*/ // /*==== (DEFAULT) use fixed table instead of exp() and sin() ====*/ // #define RGBLIGHT_BREATHE_TABLE_SIZE 256 // 256(default) or 128 or 64 // /*==== use exp() and sin() ====*/ // #define RGBLIGHT_EFFECT_BREATHE_CENTER 1.85 // 1 to 2.7 // #define RGBLIGHT_EFFECT_BREATHE_MAX 255 // 0 to 255 #endif /* Debounce reduces chatter (unintended double-presses) - set 0 if debouncing is not needed */ #define DEBOUNCE 5 /* define if matrix has ghost (lacks anti-ghosting diodes) */ //#define MATRIX_HAS_GHOST /* Mechanical locking support. Use KC_LCAP, KC_LNUM or KC_LSCR instead in keymap */ #define LOCKING_SUPPORT_ENABLE /* Locking resynchronize hack */ #define LOCKING_RESYNC_ENABLE /* If defined, GRAVE_ESC will always act as ESC when CTRL is held. * This is userful for the Windows task manager shortcut (ctrl+shift+esc). */ // #define GRAVE_ESC_CTRL_OVERRIDE /* * Force NKRO * * Force NKRO (nKey Rollover) to be enabled by default, regardless of the saved * state in the bootmagic EEPROM settings. (Note that NKRO must be enabled in the * makefile for this to work.) * * If forced on, NKRO can be disabled via magic key (default = LShift+RShift+N) * until the next keyboard reset. * * NKRO may prevent your keystrokes from being detected in the BIOS, but it is * fully operational during normal computer usage. * * For a less heavy-handed approach, enable NKRO via magic key (LShift+RShift+N) * or via bootmagic (hold SPACE+N while plugging in the keyboard). Once set by * bootmagic, NKRO mode will always be enabled until it is toggled again during a * power-up. * */ //#define FORCE_NKRO /* * Magic Key Options * * Magic keys are hotkey commands that allow control over firmware functions of * the keyboard. They are best used in combination with the HID Listen program, * found here: https://www.pjrc.com/teensy/hid_listen.html * * The options below allow the magic key functionality to be changed. This is * useful if your keyboard/keypad is missing keys and you want magic key support. * */ /* key combination for magic key command */ /* defined by default; to change, uncomment and set to the combination you want */ // #define IS_COMMAND() (get_mods() == MOD_MASK_SHIFT) /* control how magic key switches layers */ //#define MAGIC_KEY_SWITCH_LAYER_WITH_FKEYS true //#define MAGIC_KEY_SWITCH_LAYER_WITH_NKEYS true //#define MAGIC_KEY_SWITCH_LAYER_WITH_CUSTOM false /* override magic key keymap */ //#define MAGIC_KEY_SWITCH_LAYER_WITH_FKEYS //#define MAGIC_KEY_SWITCH_LAYER_WITH_NKEYS //#define MAGIC_KEY_SWITCH_LAYER_WITH_CUSTOM //#define MAGIC_KEY_HELP H //#define MAGIC_KEY_HELP_ALT SLASH //#define MAGIC_KEY_DEBUG D //#define MAGIC_KEY_DEBUG_MATRIX X //#define MAGIC_KEY_DEBUG_KBD K //#define MAGIC_KEY_DEBUG_MOUSE M //#define MAGIC_KEY_VERSION V //#define MAGIC_KEY_STATUS S //#define MAGIC_KEY_CONSOLE C //#define MAGIC_KEY_LAYER0 0 //#define MAGIC_KEY_LAYER0_ALT GRAVE //#define MAGIC_KEY_LAYER1 1 //#define MAGIC_KEY_LAYER2 2 //#define MAGIC_KEY_LAYER3 3 //#define MAGIC_KEY_LAYER4 4 //#define MAGIC_KEY_LAYER5 5 //#define MAGIC_KEY_LAYER6 6 //#define MAGIC_KEY_LAYER7 7 //#define MAGIC_KEY_LAYER8 8 //#define MAGIC_KEY_LAYER9 9 //#define MAGIC_KEY_BOOTLOADER B //#define MAGIC_KEY_BOOTLOADER_ALT ESC //#define MAGIC_KEY_LOCK CAPS //#define MAGIC_KEY_EEPROM E //#define MAGIC_KEY_EEPROM_CLEAR BSPACE //#define MAGIC_KEY_NKRO N //#define MAGIC_KEY_SLEEP_LED Z /* * Feature disable options * These options are also useful to firmware size reduction. */ /* disable debug print */ //#define NO_DEBUG /* disable print */ //#define NO_PRINT /* disable action features */ //#define NO_ACTION_LAYER //#define NO_ACTION_TAPPING //#define NO_ACTION_ONESHOT /* disable these deprecated features by default */ #ifndef LINK_TIME_OPTIMIZATION_ENABLE #define NO_ACTION_MACRO #define NO_ACTION_FUNCTION #endif /* * MIDI options */ /* Prevent use of disabled MIDI features in the keymap */ //#define MIDI_ENABLE_STRICT 1 /* enable basic MIDI features: - MIDI notes can be sent when in Music mode is on */ //#define MIDI_BASIC /* enable advanced MIDI features: - MIDI notes can be added to the keymap - Octave shift and transpose - Virtual sustain, portamento, and modulation wheel - etc. */ //#define MIDI_ADVANCED /* override number of MIDI tone keycodes (each octave adds 12 keycodes and allocates 12 bytes) */ //#define MIDI_TONE_KEYCODE_OCTAVES 1 /* * HD44780 LCD Display Configuration */ /* #define LCD_LINES 2 //< number of visible lines of the display #define LCD_DISP_LENGTH 16 //< visibles characters per line of the display #define LCD_IO_MODE 1 //< 0: memory mapped mode, 1: IO port mode #if LCD_IO_MODE #define LCD_PORT PORTB //< port for the LCD lines #define LCD_DATA0_PORT LCD_PORT //< port for 4bit data bit 0 #define LCD_DATA1_PORT LCD_PORT //< port for 4bit data bit 1 #define LCD_DATA2_PORT LCD_PORT //< port for 4bit data bit 2 #define LCD_DATA3_PORT LCD_PORT //< port for 4bit data bit 3 #define LCD_DATA0_PIN 4 //< pin for 4bit data bit 0 #define LCD_DATA1_PIN 5 //< pin for 4bit data bit 1 #define LCD_DATA2_PIN 6 //< pin for 4bit data bit 2 #define LCD_DATA3_PIN 7 //< pin for 4bit data bit 3 #define LCD_RS_PORT LCD_PORT //< port for RS line #define LCD_RS_PIN 3 //< pin for RS line #define LCD_RW_PORT LCD_PORT //< port for RW line #define LCD_RW_PIN 2 //< pin for RW line #define LCD_E_PORT LCD_PORT //< port for Enable line #define LCD_E_PIN 1 //< pin for Enable line #endif */ /* Bootmagic Lite key configuration */ // #define BOOTMAGIC_LITE_ROW 0 // #define BOOTMAGIC_LITE_COLUMN 0 >133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 
--- a/drivers/mtd/Kconfig
+++ b/drivers/mtd/Kconfig
@@ -47,6 +47,16 @@ config MTD_PARTITIONS
 	  devices. Partitioning on NFTL 'devices' is a different - that's the
 	  'normal' form of partitioning used on a block device.
 
+config MTD_ROOTFS_ROOT_DEV
+	bool "Automatically set 'rootfs' partition to be root filesystem"
+	depends on MTD_PARTITIONS
+	default y
+
+config MTD_ROOTFS_SPLIT
+	bool "Automatically split 'rootfs' partition for squashfs"
+	depends on MTD_PARTITIONS
+	default y
+
 config MTD_REDBOOT_PARTS
 	tristate "RedBoot partition table parsing"
 	depends on MTD_PARTITIONS
--- a/drivers/mtd/mtdpart.c
+++ b/drivers/mtd/mtdpart.c
@@ -20,6 +20,8 @@
 #include <linux/mtd/mtd.h>
 #include <linux/mtd/partitions.h>
 #include <linux/mtd/compatmac.h>
+#include <linux/squashfs_fs.h>
+#include <linux/root_dev.h>
 
 /* Our partition linked list */
 static LIST_HEAD(mtd_partitions);
@@ -39,7 +41,7 @@ struct mtd_part {
  * the pointer to that structure with this macro.
  */
 #define PART(x)  ((struct mtd_part *)(x))
-
+#define IS_PART(mtd) (mtd->read == part_read)
 
 /*
  * MTD methods which simply translate the effective address and pass through
@@ -322,6 +324,316 @@ int del_mtd_partitions(struct mtd_info *
 	return 0;
 }
 
+static u_int32_t cur_offset = 0;
+static int add_one_partition(struct mtd_info *master, const struct mtd_partition *part,
+		int i, struct mtd_part **slp)
+{
+	struct mtd_part *slave;
+
+	/* allocate the partition structure */
+	slave = kzalloc (sizeof(*slave), GFP_KERNEL);
+	if (!slave) {
+		printk ("memory allocation error while creating partitions for \"%s\"\n",
+			master->name);
+		del_mtd_partitions(master);
+		return -ENOMEM;
+	}
+	list_add(&slave->list, &mtd_partitions);
+
+	/* set up the MTD object for this partition */
+	slave->mtd.type = master->type;
+	slave->mtd.flags = master->flags & ~part->mask_flags;
+	slave->mtd.size = part->size;
+	slave->mtd.writesize = master->writesize;
+	slave->mtd.oobsize = master->oobsize;
+	slave->mtd.oobavail = master->oobavail;
+	slave->mtd.subpage_sft = master->subpage_sft;
+
+	slave->mtd.name = part->name;
+	slave->mtd.owner = master->owner;
+
+	slave->mtd.read = part_read;
+	slave->mtd.write = part_write;
+
+	if (master->panic_write)
+		slave->mtd.panic_write = part_panic_write;
+
+	slave->mtd.refresh_device = part->refresh_partition;
+
+	if(master->point && master->unpoint){
+		slave->mtd.point = part_point;
+		slave->mtd.unpoint = part_unpoint;
+	}
+
+	if (master->read_oob)
+		slave->mtd.read_oob = part_read_oob;
+	if (master->write_oob)
+		slave->mtd.write_oob = part_write_oob;
+	if(master->read_user_prot_reg)
+		slave->mtd.read_user_prot_reg = part_read_user_prot_reg;
+	if(master->read_fact_prot_reg)
+		slave->mtd.read_fact_prot_reg = part_read_fact_prot_reg;
+	if(master->write_user_prot_reg)
+		slave->mtd.write_user_prot_reg = part_write_user_prot_reg;
+	if(master->lock_user_prot_reg)
+		slave->mtd.lock_user_prot_reg = part_lock_user_prot_reg;
+	if(master->get_user_prot_info)
+		slave->mtd.get_user_prot_info = part_get_user_prot_info;
+	if(master->get_fact_prot_info)
+		slave->mtd.get_fact_prot_info = part_get_fact_prot_info;
+	if (master->sync)
+		slave->mtd.sync = part_sync;
+	if (!i && master->suspend && master->resume) {
+			slave->mtd.suspend = part_suspend;
+			slave->mtd.resume = part_resume;
+	}
+	if (master->writev)
+		slave->mtd.writev = part_writev;
+	if (master->lock)
+		slave->mtd.lock = part_lock;
+	if (master->unlock)
+		slave->mtd.unlock = part_unlock;
+	if (master->block_isbad)
+		slave->mtd.block_isbad = part_block_isbad;
+	if (master->block_markbad)
+		slave->mtd.block_markbad = part_block_markbad;
+	slave->mtd.erase = part_erase;
+	slave->master = master;
+	slave->offset = part->offset;
+	slave->index = i;
+
+	if (slave->offset == MTDPART_OFS_APPEND)
+		slave->offset = cur_offset;
+	if (slave->offset == MTDPART_OFS_NXTBLK) {
+		slave->offset = cur_offset;
+		if ((cur_offset % master->erasesize) != 0) {
+			/* Round up to next erasesize */
+			slave->offset = ((cur_offset / master->erasesize) + 1) * master->erasesize;
+			printk(KERN_NOTICE "Moving partition %d: "
+			       "0x%08x -> 0x%08x\n", i,
+			       cur_offset, slave->offset);
+		}
+	}
+	if (slave->mtd.size == MTDPART_SIZ_FULL)
+		slave->mtd.size = master->size - slave->offset;
+	cur_offset = slave->offset + slave->mtd.size;
+
+	printk (KERN_NOTICE "0x%08x-0x%08x : \"%s\"\n", slave->offset,
+		slave->offset + slave->mtd.size, slave->mtd.name);
+
+	/* let's do some sanity checks */
+	if (slave->offset >= master->size) {
+			/* let's register it anyway to preserve ordering */
+		slave->offset = 0;
+		slave->mtd.size = 0;
+		printk ("mtd: partition \"%s\" is out of reach -- disabled\n",
+			part->name);
+	}
+	if (slave->offset + slave->mtd.size > master->size) {
+		slave->mtd.size = master->size - slave->offset;
+		printk ("mtd: partition \"%s\" extends beyond the end of device \"%s\" -- size truncated to %#x\n",
+			part->name, master->name, slave->mtd.size);
+	}
+	if (master->numeraseregions>1) {
+		/* Deal with variable erase size stuff */
+		int i;
+		struct mtd_erase_region_info *regions = master->eraseregions;
+
+		/* Find the first erase regions which is part of this partition. */
+		for (i=0; i < master->numeraseregions && slave->offset >= regions[i].offset; i++)
+			;
+
+		for (i--; i < master->numeraseregions && slave->offset + slave->mtd.size > regions[i].offset; i++) {
+			if (slave->mtd.erasesize < regions[i].erasesize) {
+				slave->mtd.erasesize = regions[i].erasesize;
+			}
+		}
+	} else {
+		/* Single erase size */
+		slave->mtd.erasesize = master->erasesize;
+	}
+
+	if ((slave->mtd.flags & MTD_WRITEABLE) &&
+	    (slave->offset % slave->mtd.erasesize)) {
+		/* Doesn't start on a boundary of major erase size */
+		/* FIXME: Let it be writable if it is on a boundary of _minor_ erase size though */
+		slave->mtd.flags &= ~MTD_WRITEABLE;
+		printk ("mtd: partition \"%s\" doesn't start on an erase block boundary -- force read-only\n",
+			part->name);
+	}
+	if ((slave->mtd.flags & MTD_WRITEABLE) &&
+	    (slave->mtd.size % slave->mtd.erasesize)) {
+		slave->mtd.flags &= ~MTD_WRITEABLE;
+		printk ("mtd: partition \"%s\" doesn't end on an erase block -- force read-only\n",
+			part->name);
+	}
+
+	slave->mtd.ecclayout = master->ecclayout;
+	if (master->block_isbad) {
+		uint32_t offs = 0;
+
+		while(offs < slave->mtd.size) {
+			if (master->block_isbad(master,
+						offs + slave->offset))
+				slave->mtd.ecc_stats.badblocks++;
+			offs += slave->mtd.erasesize;
+		}
+	}
+
+	if(part->mtdp)
+	{	/* store the object pointer (caller may or may not register it */
+		*part->mtdp = &slave->mtd;
+		slave->registered = 0;
+	}
+	else
+	{
+		/* register our partition */
+		add_mtd_device(&slave->mtd);
+		slave->registered = 1;
+	}
+
+	if (slp)
+		*slp = slave;
+
+	return 0;
+}
+
+#ifdef CONFIG_MTD_ROOTFS_SPLIT
+#define ROOTFS_SPLIT_NAME "rootfs_data"
+#define ROOTFS_REMOVED_NAME "<removed>"
+static int split_squashfs(struct mtd_info *master, int offset, int *split_offset)
+{
+	char buf[512];
+	struct squashfs_super_block *sb = (struct squashfs_super_block *) buf;
+	int len, ret;
+
+	ret = master->read(master, offset, sizeof(*sb), &len, buf);
+	if (ret || (len != sizeof(*sb))) {
+		printk(KERN_ALERT "split_squashfs: error occured while reading "
+			"from \"%s\"\n", master->name);
+		return -EINVAL;
+	}
+
+	if (*((u32 *) buf) != SQUASHFS_MAGIC) {
+		printk(KERN_ALERT "split_squashfs: no squashfs found in \"%s\"\n",
+			master->name);
+		*split_offset = 0;
+		return 0;
+	}
+
+	if (sb->bytes_used <= 0) {
+		printk(KERN_ALERT "split_squashfs: squashfs is empty in \"%s\"\n",
+			master->name);
+		*split_offset = 0;
+		return 0;
+	}
+
+	len = (u32) sb->bytes_used;
+	len += (offset & 0x000fffff);
+	len +=  (master->erasesize - 1);
+	len &= ~(master->erasesize - 1);
+	len -= (offset & 0x000fffff);
+	*split_offset = offset + len;
+
+	return 0;
+}
+
+static int split_rootfs_data(struct mtd_info *master, struct mtd_info *rpart, struct mtd_partition *part,
+		int index)
+{
+	struct mtd_partition *dpart;
+	struct mtd_part *slave = NULL;
+	int split_offset = 0;
+	int ret;
+
+	ret = split_squashfs(master, part->offset, &split_offset);
+	if (ret)
+		return ret;
+
+	if (split_offset <= 0)
+		return 0;
+
+	dpart = kmalloc(sizeof(*part)+sizeof(ROOTFS_SPLIT_NAME)+1, GFP_KERNEL);
+	if (dpart == NULL) {
+		printk(KERN_INFO "split_squashfs: no memory for partition \"%s\"\n",
+			ROOTFS_SPLIT_NAME);
+		return -ENOMEM;
+	}
+
+	memcpy(dpart, part, sizeof(*part));
+	dpart->name = (unsigned char *)&dpart[1];
+	strcpy(dpart->name, ROOTFS_SPLIT_NAME);
+
+	dpart->size -= split_offset - dpart->offset;
+	dpart->offset = split_offset;
+
+	if (dpart == NULL)
+		return 1;
+
+	printk(KERN_INFO "mtd: partition \"%s\" created automatically, ofs=%X, len=%X \n",
+		ROOTFS_SPLIT_NAME, dpart->offset, dpart->size);
+
+	ret = add_one_partition(master, dpart, index, &slave);
+	if (ret)
+		kfree(dpart);
+	else if (slave)
+		rpart->split = &slave->mtd;
+
+	return ret;
+}
+
+static int refresh_rootfs_split(struct mtd_info *mtd)
+{
+	struct mtd_partition tpart;
+	struct mtd_part *part;
+	int index = 0;
+	int offset, size;
+	int ret;
+
+	part = PART(mtd);
+
+	/* check for the new squashfs offset first */
+	ret = split_squashfs(part->master, part->offset, &offset);
+	if (ret)
+		return ret;
+
+	if ((offset > 0) && !mtd->split) {
+		printk(KERN_INFO "%s: creating new split partition for \"%s\"\n", __func__, mtd->name);
+		/* if we don't have a rootfs split partition, create a new one */
+		tpart.name = mtd->name;
+		tpart.size = mtd->size;
+		tpart.offset = part->offset;
+
+		/* find the index of the last partition */
+		if (!list_empty(&mtd_partitions))
+			index = list_first_entry(&mtd_partitions, struct mtd_part, list)->index + 1;
+
+		return split_rootfs_data(part->master, &part->mtd, &tpart, index);
+	} else if ((offset > 0) && mtd->split) {
+		/* update the offsets of the existing partition */
+		size = mtd->size + part->offset - offset;
+
+		part = PART(mtd->split);
+		part->offset = offset;
+		part->mtd.size = size;
+		printk(KERN_INFO "%s: %s partition \"" ROOTFS_SPLIT_NAME "\", offset: 0x%06x (0x%06x)\n",
+			__func__, (!strcmp(part->mtd.name, ROOTFS_SPLIT_NAME) ? "updating" : "creating"),
+			part->offset, part->mtd.size);
+		strcpy(part->mtd.name, ROOTFS_SPLIT_NAME);
+	} else if ((offset <= 0) && mtd->split) {
+		printk(KERN_INFO "%s: removing partition \"%s\"\n", __func__, mtd->split->name);
+
+		/* mark existing partition as removed */
+		part = PART(mtd->split);
+		strcpy(part->mtd.name, ROOTFS_REMOVED_NAME);
+		part->offset = 0;
+		part->mtd.size = 0;
+	}
+
+	return 0;
+}
+#endif /* CONFIG_MTD_ROOTFS_SPLIT */
+
 /*
  * This function, given a master MTD object and a partition table, creates
  * and registers slave MTD objects which are bound to the master according to
@@ -334,171 +646,31 @@ int add_mtd_partitions(struct mtd_info *
 		       int nbparts)
 {
 	struct mtd_part *slave;
-	u_int32_t cur_offset = 0;
-	int i;
+	struct mtd_partition *part;
+	int i, j, ret = 0;
 
 	printk (KERN_NOTICE "Creating %d MTD partitions on \"%s\":\n", nbparts, master->name);
 
-	for (i = 0; i < nbparts; i++) {
-
-		/* allocate the partition structure */
-		slave = kzalloc (sizeof(*slave), GFP_KERNEL);
-		if (!slave) {
-			printk ("memory allocation error while creating partitions for \"%s\"\n",
-				master->name);
-			del_mtd_partitions(master);
-			return -ENOMEM;
-		}
-		list_add(&slave->list, &mtd_partitions);
-
-		/* set up the MTD object for this partition */
-		slave->mtd.type = master->type;
-		slave->mtd.flags = master->flags & ~parts[i].mask_flags;
-		slave->mtd.size = parts[i].size;
-		slave->mtd.writesize = master->writesize;
-		slave->mtd.oobsize = master->oobsize;
-		slave->mtd.oobavail = master->oobavail;
-		slave->mtd.subpage_sft = master->subpage_sft;
-
-		slave->mtd.name = parts[i].name;
-		slave->mtd.owner = master->owner;
-
-		slave->mtd.read = part_read;
-		slave->mtd.write = part_write;
-
-		if (master->panic_write)
-			slave->mtd.panic_write = part_panic_write;
-
-		if(master->point && master->unpoint){
-			slave->mtd.point = part_point;
-			slave->mtd.unpoint = part_unpoint;
-		}
-
-		if (master->read_oob)
-			slave->mtd.read_oob = part_read_oob;
-		if (master->write_oob)
-			slave->mtd.write_oob = part_write_oob;
-		if(master->read_user_prot_reg)
-			slave->mtd.read_user_prot_reg = part_read_user_prot_reg;
-		if(master->read_fact_prot_reg)
-			slave->mtd.read_fact_prot_reg = part_read_fact_prot_reg;
-		if(master->write_user_prot_reg)
-			slave->mtd.write_user_prot_reg = part_write_user_prot_reg;
-		if(master->lock_user_prot_reg)
-			slave->mtd.lock_user_prot_reg = part_lock_user_prot_reg;
-		if(master->get_user_prot_info)
-			slave->mtd.get_user_prot_info = part_get_user_prot_info;
-		if(master->get_fact_prot_info)
-			slave->mtd.get_fact_prot_info = part_get_fact_prot_info;
-		if (master->sync)
-			slave->mtd.sync = part_sync;
-		if (!i && master->suspend && master->resume) {
-				slave->mtd.suspend = part_suspend;
-				slave->mtd.resume = part_resume;
-		}
-		if (master->writev)
-			slave->mtd.writev = part_writev;
-		if (master->lock)
-			slave->mtd.lock = part_lock;
-		if (master->unlock)
-			slave->mtd.unlock = part_unlock;
-		if (master->block_isbad)
-			slave->mtd.block_isbad = part_block_isbad;
-		if (master->block_markbad)
-			slave->mtd.block_markbad = part_block_markbad;
-		slave->mtd.erase = part_erase;
-		slave->master = master;
-		slave->offset = parts[i].offset;
-		slave->index = i;
-
-		if (slave->offset == MTDPART_OFS_APPEND)
-			slave->offset = cur_offset;
-		if (slave->offset == MTDPART_OFS_NXTBLK) {
-			slave->offset = cur_offset;
-			if ((cur_offset % master->erasesize) != 0) {
-				/* Round up to next erasesize */
-				slave->offset = ((cur_offset / master->erasesize) + 1) * master->erasesize;
-				printk(KERN_NOTICE "Moving partition %d: "
-				       "0x%08x -> 0x%08x\n", i,
-				       cur_offset, slave->offset);
-			}
-		}
-		if (slave->mtd.size == MTDPART_SIZ_FULL)
-			slave->mtd.size = master->size - slave->offset;
-		cur_offset = slave->offset + slave->mtd.size;
-
-		printk (KERN_NOTICE "0x%08x-0x%08x : \"%s\"\n", slave->offset,
-			slave->offset + slave->mtd.size, slave->mtd.name);
-
-		/* let's do some sanity checks */
-		if (slave->offset >= master->size) {
-				/* let's register it anyway to preserve ordering */
-			slave->offset = 0;
-			slave->mtd.size = 0;
-			printk ("mtd: partition \"%s\" is out of reach -- disabled\n",
-				parts[i].name);
-		}
-		if (slave->offset + slave->mtd.size > master->size) {
-			slave->mtd.size = master->size - slave->offset;
-			printk ("mtd: partition \"%s\" extends beyond the end of device \"%s\" -- size truncated to %#x\n",
-				parts[i].name, master->name, slave->mtd.size);
-		}
-		if (master->numeraseregions>1) {
-			/* Deal with variable erase size stuff */
-			int i;
-			struct mtd_erase_region_info *regions = master->eraseregions;
-
-			/* Find the first erase regions which is part of this partition. */
-			for (i=0; i < master->numeraseregions && slave->offset >= regions[i].offset; i++)
-				;
-
-			for (i--; i < master->numeraseregions && slave->offset + slave->mtd.size > regions[i].offset; i++) {
-				if (slave->mtd.erasesize < regions[i].erasesize) {
-					slave->mtd.erasesize = regions[i].erasesize;
-				}
+	for (i = 0, j = 0; i < nbparts; i++) {
+		part = (struct mtd_partition *) &parts[i];
+		ret = add_one_partition(master, part, j, &slave);
+		if (ret)
+			return ret;
+		j++;
+
+		if (strcmp(part->name, "rootfs") == 0 && slave->registered) {
+#ifdef CONFIG_MTD_ROOTFS_ROOT_DEV
+			if (ROOT_DEV == 0) {
+				printk(KERN_NOTICE "mtd: partition \"rootfs\" "
+					"set to be root filesystem\n");
+				ROOT_DEV = MKDEV(MTD_BLOCK_MAJOR, slave->mtd.index);
 			}
-		} else {
-			/* Single erase size */
-			slave->mtd.erasesize = master->erasesize;
-		}
-
-		if ((slave->mtd.flags & MTD_WRITEABLE) &&
-		    (slave->offset % slave->mtd.erasesize)) {
-			/* Doesn't start on a boundary of major erase size */
-			/* FIXME: Let it be writable if it is on a boundary of _minor_ erase size though */
-			slave->mtd.flags &= ~MTD_WRITEABLE;
-			printk ("mtd: partition \"%s\" doesn't start on an erase block boundary -- force read-only\n",
-				parts[i].name);
-		}
-		if ((slave->mtd.flags & MTD_WRITEABLE) &&
-		    (slave->mtd.size % slave->mtd.erasesize)) {
-			slave->mtd.flags &= ~MTD_WRITEABLE;
-			printk ("mtd: partition \"%s\" doesn't end on an erase block -- force read-only\n",
-				parts[i].name);
-		}
-
-		slave->mtd.ecclayout = master->ecclayout;
-		if (master->block_isbad) {
-			uint32_t offs = 0;
-
-			while(offs < slave->mtd.size) {
-				if (master->block_isbad(master,
-							offs + slave->offset))
-					slave->mtd.ecc_stats.badblocks++;
-				offs += slave->mtd.erasesize;
-			}
-		}
-
-		if(parts[i].mtdp)
-		{	/* store the object pointer (caller may or may not register it */
-			*parts[i].mtdp = &slave->mtd;
-			slave->registered = 0;
-		}
-		else
-		{
-			/* register our partition */
-			add_mtd_device(&slave->mtd);
-			slave->registered = 1;
+#endif
+#ifdef CONFIG_MTD_ROOTFS_SPLIT
+			ret = split_rootfs_data(master, &slave->mtd, part, j);
+			if (ret == 0)
+				j++;
+#endif
 		}
 	}
 
@@ -574,6 +746,32 @@ int parse_mtd_partitions(struct mtd_info
 	return ret;
 }
 
+int refresh_mtd_partitions(struct mtd_info *mtd)
+{
+	int ret = 0;
+
+	if (IS_PART(mtd)) {
+		struct mtd_part *part;
+		struct mtd_info *master;
+
+		part = PART(mtd);
+		master = part->master;
+		if (master->refresh_device)
+			ret = master->refresh_device(master);
+	}
+
+	if (!ret && mtd->refresh_device)
+		ret = mtd->refresh_device(mtd);
+
+#ifdef CONFIG_MTD_ROOTFS_SPLIT
+	if (!ret && IS_PART(mtd) && !strcmp(mtd->name, "rootfs"))
+		refresh_rootfs_split(mtd);
+#endif
+
+	return 0;
+}
+
 EXPORT_SYMBOL_GPL(parse_mtd_partitions);
+EXPORT_SYMBOL_GPL(refresh_mtd_partitions);
 EXPORT_SYMBOL_GPL(register_mtd_parser);
 EXPORT_SYMBOL_GPL(deregister_mtd_parser);
--- a/drivers/mtd/devices/block2mtd.c
+++ b/drivers/mtd/devices/block2mtd.c
@@ -34,6 +34,8 @@ struct block2mtd_dev {
 	struct block_device *blkdev;
 	struct mtd_info mtd;
 	struct mutex write_mutex;
+	rwlock_t bdev_mutex;
+	char devname[0];
 };
 
 
@@ -86,6 +88,12 @@ static int block2mtd_erase(struct mtd_in
 	size_t len = instr->len;
 	int err;
 
+	read_lock(&dev->bdev_mutex);
+	if (!dev->blkdev) {
+		err = -EINVAL;
+		goto done;
+	}
+
 	instr->state = MTD_ERASING;
 	mutex_lock(&dev->write_mutex);
 	err = _block2mtd_erase(dev, from, len);
@@ -98,6 +106,10 @@ static int block2mtd_erase(struct mtd_in
 
 	instr->state = MTD_ERASE_DONE;
 	mtd_erase_callback(instr);
+
+done:
+	read_unlock(&dev->bdev_mutex);
+
 	return err;
 }
 
@@ -109,10 +121,14 @@ static int block2mtd_read(struct mtd_inf
 	struct page *page;
 	int index = from >> PAGE_SHIFT;
 	int offset = from & (PAGE_SIZE-1);
-	int cpylen;
+	int cpylen, err = 0;
+
+	read_lock(&dev->bdev_mutex);
+	if (!dev->blkdev || (from > mtd->size)) {
+		err = -EINVAL;
+		goto done;
+	}
 
-	if (from > mtd->size)
-		return -EINVAL;
 	if (from + len > mtd->size)
 		len = mtd->size - from;
 
@@ -127,10 +143,14 @@ static int block2mtd_read(struct mtd_inf
 		len = len - cpylen;
 
 		page = page_read(dev->blkdev->bd_inode->i_mapping, index);
-		if (!page)
-			return -ENOMEM;
-		if (IS_ERR(page))
-			return PTR_ERR(page);
+		if (!page) {
+			err = -ENOMEM;
+			goto done;
+		}
+		if (IS_ERR(page)) {
+			err = PTR_ERR(page);
+			goto done;
+		}
 
 		memcpy(buf, page_address(page) + offset, cpylen);
 		page_cache_release(page);
@@ -141,7 +161,10 @@ static int block2mtd_read(struct mtd_inf
 		offset = 0;
 		index++;
 	}
-	return 0;
+
+done:
+	read_unlock(&dev->bdev_mutex);
+	return err;
 }
 
 
@@ -193,12 +216,22 @@ static int block2mtd_write(struct mtd_in
 		size_t *retlen, const u_char *buf)
 {
 	struct block2mtd_dev *dev = mtd->priv;
-	int err;
+	int err = 0;
+
+	read_lock(&dev->bdev_mutex);
+	if (!dev->blkdev) {
+		err = -EINVAL;
+		goto done;
+	}
 
 	if (!len)
-		return 0;
-	if (to >= mtd->size)
-		return -ENOSPC;
+		goto done;
+
+	if (to >= mtd->size) {
+		err = -ENOSPC;
+		goto done;
+	}
+
 	if (to + len > mtd->size)
 		len = mtd->size - to;
 
@@ -207,6 +240,9 @@ static int block2mtd_write(struct mtd_in
 	mutex_unlock(&dev->write_mutex);
 	if (err > 0)
 		err = 0;
+
+done:
+	read_unlock(&dev->bdev_mutex);
 	return err;
 }
 
@@ -215,51 +251,29 @@ static int block2mtd_write(struct mtd_in
 static void block2mtd_sync(struct mtd_info *mtd)
 {
 	struct block2mtd_dev *dev = mtd->priv;
-	sync_blockdev(dev->blkdev);
-	return;
-}
-
-
-static void block2mtd_free_device(struct block2mtd_dev *dev)
-{
-	if (!dev)
-		return;
-
-	kfree(dev->mtd.name);
 
-	if (dev->blkdev) {
-		invalidate_mapping_pages(dev->blkdev->bd_inode->i_mapping,
-					0, -1);
-		close_bdev_excl(dev->blkdev);
-	}
+	read_lock(&dev->bdev_mutex);
+	if (dev->blkdev)
+		sync_blockdev(dev->blkdev);
+	read_unlock(&dev->bdev_mutex);
 
-	kfree(dev);
+	return;
 }
 
 
-/* FIXME: ensure that mtd->size % erase_size == 0 */
-static struct block2mtd_dev *add_device(char *devname, int erase_size, char *mtdname)
+static int _open_bdev(struct block2mtd_dev *dev)
 {
 	struct block_device *bdev;
-	struct block2mtd_dev *dev;
-	struct mtd_partition *part;
-
-	if (!devname)
-		return NULL;
-
-	dev = kzalloc(sizeof(struct block2mtd_dev), GFP_KERNEL);
-	if (!dev)
-		return NULL;
 
 	/* Get a handle on the device */
-	bdev = open_bdev_excl(devname, O_RDWR, NULL);
+	bdev = open_bdev_excl(dev->devname, O_RDWR, NULL);
 #ifndef MODULE
 	if (IS_ERR(bdev)) {
 
 		/* We might not have rootfs mounted at this point. Try
 		   to resolve the device name by other means. */
 
-		dev_t devt = name_to_dev_t(devname);
+		dev_t devt = name_to_dev_t(dev->devname);
 		if (devt) {
 			bdev = open_by_devnum(devt, FMODE_WRITE | FMODE_READ);
 		}
@@ -267,17 +281,96 @@ static struct block2mtd_dev *add_device(
 #endif
 
 	if (IS_ERR(bdev)) {
-		ERROR("error: cannot open device %s", devname);
-		goto devinit_err;
+		ERROR("error: cannot open device %s", dev->devname);
+		return 1;
 	}
 	dev->blkdev = bdev;
 
 	if (MAJOR(bdev->bd_dev) == MTD_BLOCK_MAJOR) {
 		ERROR("attempting to use an MTD device as a block device");
-		goto devinit_err;
+		return 1;
 	}
 
+	return 0;
+}
+
+static void _close_bdev(struct block2mtd_dev *dev)
+{
+	struct block_device *bdev;
+
+	if (!dev->blkdev)
+		return;
+
+	bdev = dev->blkdev;
+	invalidate_mapping_pages(dev->blkdev->bd_inode->i_mapping, 0, -1);
+	close_bdev_excl(dev->blkdev);
+	dev->blkdev = NULL;
+}
+
+static void block2mtd_free_device(struct block2mtd_dev *dev)
+{
+	if (!dev)
+		return;
+
+	kfree(dev->mtd.name);
+	_close_bdev(dev);
+	kfree(dev);
+}
+
+
+static int block2mtd_refresh(struct mtd_info *mtd)
+{
+	struct block2mtd_dev *dev = mtd->priv;
+	struct block_device *bdev;
+	dev_t devt;
+	int err = 0;
+
+	/* no other mtd function can run at this point */
+	write_lock(&dev->bdev_mutex);
+
+	/* get the device number for the whole disk */
+	devt = MKDEV(MAJOR(dev->blkdev->bd_dev), 0);
+
+	/* close the old block device */
+	_close_bdev(dev);
+
+	/* open the whole disk, issue a partition rescan, then */
+	bdev = open_by_devnum(devt, FMODE_WRITE | FMODE_READ);
+	if (!bdev || !bdev->bd_disk)
+		err = -EINVAL;
+	else {
+		err = rescan_partitions(bdev->bd_disk, bdev);
+	}
+	if (bdev)
+		close_bdev_excl(bdev);
+
+	/* try to open the partition block device again */
+	_open_bdev(dev);
+	write_unlock(&dev->bdev_mutex);
+
+	return err;
+}
+
+/* FIXME: ensure that mtd->size % erase_size == 0 */
+static struct block2mtd_dev *add_device(char *devname, int erase_size, char *mtdname)
+{
+	struct block2mtd_dev *dev;
+	struct mtd_partition *part;
+
+	if (!devname)
+		return NULL;
+
+	dev = kzalloc(sizeof(struct block2mtd_dev) + strlen(devname) + 1, GFP_KERNEL);
+	if (!dev)
+		return NULL;
+
+	strcpy(dev->devname, devname);
+
+	if (_open_bdev(dev))
+		goto devinit_err;
+
 	mutex_init(&dev->write_mutex);
+	rwlock_init(&dev->bdev_mutex);
 
 	/* Setup the MTD structure */
 	/* make the name contain the block device in */
@@ -304,6 +397,7 @@ static struct block2mtd_dev *add_device(
 	dev->mtd.read = block2mtd_read;
 	dev->mtd.priv = dev;
 	dev->mtd.owner = THIS_MODULE;
+	dev->mtd.refresh_device = block2mtd_refresh;
 	
 	part = kzalloc(sizeof(struct mtd_partition), GFP_KERNEL);
 	part->name = dev->mtd.name;
--- a/drivers/mtd/mtdchar.c
+++ b/drivers/mtd/mtdchar.c
@@ -17,6 +17,7 @@
 
 #include <linux/mtd/mtd.h>
 #include <linux/mtd/compatmac.h>
+#include <linux/mtd/partitions.h>
 
 #include <asm/uaccess.h>
 
@@ -756,6 +757,13 @@ static int mtd_ioctl(struct inode *inode
 		file->f_pos = 0;
 		break;
 	}
+#ifdef CONFIG_MTD_PARTITIONS
+	case MTDREFRESH:
+	{
+		ret = refresh_mtd_partitions(mtd);
+		break;
+	}
+#endif
 
 	default:
 		ret = -ENOTTY;
--- a/include/linux/mtd/mtd.h
+++ b/include/linux/mtd/mtd.h
@@ -98,6 +98,7 @@ struct mtd_oob_ops {
 	uint8_t		*oobbuf;
 };
 
+struct mtd_info;
 struct mtd_info {
 	u_char type;
 	u_int32_t flags;
@@ -211,6 +212,9 @@ struct mtd_info {
 	struct module *owner;
 	int usecount;
 
+	int (*refresh_device)(struct mtd_info *mtd);
+	struct mtd_info *split;
+
 	/* If the driver is something smart, like UBI, it may need to maintain
 	 * its own reference counting. The below functions are only for driver.
 	 * The driver may register its callbacks. These callbacks are not
--- a/include/linux/mtd/partitions.h
+++ b/include/linux/mtd/partitions.h
@@ -36,6 +36,7 @@
  * erasesize aligned (e.g. use MTDPART_OFS_NEXTBLK).
  */
 
+struct mtd_partition;
 struct mtd_partition {
 	char *name;			/* identifier string */
 	u_int32_t size;			/* partition size */
@@ -43,6 +44,7 @@ struct mtd_partition {
 	u_int32_t mask_flags;		/* master MTD flags to mask out for this partition */
 	struct nand_ecclayout *ecclayout;	/* out of band layout for this partition (NAND only)*/
 	struct mtd_info **mtdp;		/* pointer to store the MTD object */
+	int (*refresh_partition)(struct mtd_info *);
 };
 
 #define MTDPART_OFS_NXTBLK	(-2)
@@ -52,6 +54,7 @@ struct mtd_partition {
 
 int add_mtd_partitions(struct mtd_info *, const struct mtd_partition *, int);
 int del_mtd_partitions(struct mtd_info *);
+int refresh_mtd_partitions(struct mtd_info *);
 
 /*
  * Functions dealing with the various ways of partitioning the space
--- a/include/mtd/mtd-abi.h
+++ b/include/mtd/mtd-abi.h
@@ -95,6 +95,7 @@ struct otp_info {
 #define ECCGETLAYOUT		_IOR('M', 17, struct nand_ecclayout)
 #define ECCGETSTATS		_IOR('M', 18, struct mtd_ecc_stats)
 #define MTDFILEMODE		_IO('M', 19)
+#define MTDREFRESH		_IO('M', 23)
 
 /*
  * Obsolete legacy interface. Keep it in order not to break userspace
generated by cgit v1.2.3 (git 2.25.1) at 2025-03-29 10:54:49 +0000