drivers/base/regmap/regmap.c

   1 /*
   2  * Register map access API
   3  *
   4  * Copyright 2011 Wolfson Microelectronics plc
   5  *
   6  * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation.
  11  */
  12
  13 #include <linux/device.h>
  14 #include <linux/slab.h>
  15 #include <linux/export.h>
  16 #include <linux/mutex.h>
  17 #include <linux/err.h>
  18 #include <linux/rbtree.h>
  19
  20 #define CREATE_TRACE_POINTS
  21 #include <trace/events/regmap.h>
  22
  23 #include "internal.h"
  24
  25 /*
  26  * Sometimes for failures during very early init the trace
  27  * infrastructure isn't available early enough to be used.  For this
  28  * sort of problem defining LOG_DEVICE will add printks for basic
  29  * register I/O on a specific device.
  30  */
  31 #undef LOG_DEVICE
  32
  33 static int _regmap_update_bits(struct regmap *map, unsigned int reg,
  34                                unsigned int mask, unsigned int val,
  35                                bool *change);
  36
  37 bool regmap_reg_in_ranges(unsigned int reg,
  38                           const struct regmap_range *ranges,
  39                           unsigned int nranges)
  40 {
  41         const struct regmap_range *r;
  42         int i;
  43
  44         for (i = 0, r = ranges; i < nranges; i++, r++)
  45                 if (regmap_reg_in_range(reg, r))
  46                         return true;
  47         return false;
  48 }
  49 EXPORT_SYMBOL_GPL(regmap_reg_in_ranges);
  50
  51 static bool _regmap_check_range_table(struct regmap *map,
  52                                       unsigned int reg,
  53                                       const struct regmap_access_table *table)
  54 {
  55         /* Check "no ranges" first */
  56         if (regmap_reg_in_ranges(reg, table->no_ranges, table->n_no_ranges))
  57                 return false;
  58
  59         /* In case zero "yes ranges" are supplied, any reg is OK */
  60         if (!table->n_yes_ranges)
  61                 return true;
  62
  63         return regmap_reg_in_ranges(reg, table->yes_ranges,
  64                                     table->n_yes_ranges);
  65 }
  66
  67 bool regmap_writeable(struct regmap *map, unsigned int reg)
  68 {
  69         if (map->max_register && reg > map->max_register)
  70                 return false;
  71
  72         if (map->writeable_reg)
  73                 return map->writeable_reg(map->dev, reg);
  74
  75         if (map->wr_table)
  76                 return _regmap_check_range_table(map, reg, map->wr_table);
  77
  78         return true;
  79 }
  80
  81 bool regmap_readable(struct regmap *map, unsigned int reg)
  82 {
  83         if (map->max_register && reg > map->max_register)
  84                 return false;
  85
  86         if (map->format.format_write)
  87                 return false;
  88
  89         if (map->readable_reg)
  90                 return map->readable_reg(map->dev, reg);
  91
  92         if (map->rd_table)
  93                 return _regmap_check_range_table(map, reg, map->rd_table);
  94
  95         return true;
  96 }
  97
  98 bool regmap_volatile(struct regmap *map, unsigned int reg)
  99 {
 100         if (!regmap_readable(map, reg))
 101                 return false;
 102
 103         if (map->volatile_reg)
 104                 return map->volatile_reg(map->dev, reg);
 105
 106         if (map->volatile_table)
 107                 return _regmap_check_range_table(map, reg, map->volatile_table);
 108
 109         return true;
 110 }
 111
 112 bool regmap_precious(struct regmap *map, unsigned int reg)
 113 {
 114         if (!regmap_readable(map, reg))
 115                 return false;
 116
 117         if (map->precious_reg)
 118                 return map->precious_reg(map->dev, reg);
 119
 120         if (map->precious_table)
 121                 return _regmap_check_range_table(map, reg, map->precious_table);
 122
 123         return false;
 124 }
 125
 126 static bool regmap_volatile_range(struct regmap *map, unsigned int reg,
 127         size_t num)
 128 {
 129         unsigned int i;
 130
 131         for (i = 0; i < num; i++)
 132                 if (!regmap_volatile(map, reg + i))
 133                         return false;
 134
 135         return true;
 136 }
 137
 138 static void regmap_format_2_6_write(struct regmap *map,
 139                                      unsigned int reg, unsigned int val)
 140 {
 141         u8 *out = map->work_buf;
 142
 143         *out = (reg << 6) | val;
 144 }
 145
 146 static void regmap_format_4_12_write(struct regmap *map,
 147                                      unsigned int reg, unsigned int val)
 148 {
 149         __be16 *out = map->work_buf;
 150         *out = cpu_to_be16((reg << 12) | val);
 151 }
 152
 153 static void regmap_format_7_9_write(struct regmap *map,
 154                                     unsigned int reg, unsigned int val)
 155 {
 156         __be16 *out = map->work_buf;
 157         *out = cpu_to_be16((reg << 9) | val);
 158 }
 159
 160 static void regmap_format_10_14_write(struct regmap *map,
 161                                     unsigned int reg, unsigned int val)
 162 {
 163         u8 *out = map->work_buf;
 164
 165         out[2] = val;
 166         out[1] = (val >> 8) | (reg << 6);
 167         out[0] = reg >> 2;
 168 }
 169
 170 static void regmap_format_8(void *buf, unsigned int val, unsigned int shift)
 171 {
 172         u8 *b = buf;
 173
 174         b[0] = val << shift;
 175 }
 176
 177 static void regmap_format_16_be(void *buf, unsigned int val, unsigned int shift)
 178 {
 179         __be16 *b = buf;
 180
 181         b[0] = cpu_to_be16(val << shift);
 182 }
 183
 184 static void regmap_format_16_native(void *buf, unsigned int val,
 185                                     unsigned int shift)
 186 {
 187         *(u16 *)buf = val << shift;
 188 }
 189
 190 static void regmap_format_24(void *buf, unsigned int val, unsigned int shift)
 191 {
 192         u8 *b = buf;
 193
 194         val <<= shift;
 195
 196         b[0] = val >> 16;
 197         b[1] = val >> 8;
 198         b[2] = val;
 199 }
 200
 201 static void regmap_format_32_be(void *buf, unsigned int val, unsigned int shift)
 202 {
 203         __be32 *b = buf;
 204
 205         b[0] = cpu_to_be32(val << shift);
 206 }
 207
 208 static void regmap_format_32_native(void *buf, unsigned int val,
 209                                     unsigned int shift)
 210 {
 211         *(u32 *)buf = val << shift;
 212 }
 213
 214 static unsigned int regmap_parse_8(void *buf)
 215 {
 216         u8 *b = buf;
 217
 218         return b[0];
 219 }
 220
 221 static unsigned int regmap_parse_16_be(void *buf)
 222 {
 223         __be16 *b = buf;
 224
 225         b[0] = be16_to_cpu(b[0]);
 226
 227         return b[0];
 228 }
 229
 230 static unsigned int regmap_parse_16_native(void *buf)
 231 {
 232         return *(u16 *)buf;
 233 }
 234
 235 static unsigned int regmap_parse_24(void *buf)
 236 {
 237         u8 *b = buf;
 238         unsigned int ret = b[2];
 239         ret |= ((unsigned int)b[1]) << 8;
 240         ret |= ((unsigned int)b[0]) << 16;
 241
 242         return ret;
 243 }
 244
 245 static unsigned int regmap_parse_32_be(void *buf)
 246 {
 247         __be32 *b = buf;
 248
 249         b[0] = be32_to_cpu(b[0]);
 250
 251         return b[0];
 252 }
 253
 254 static unsigned int regmap_parse_32_native(void *buf)
 255 {
 256         return *(u32 *)buf;
 257 }
 258
 259 static void regmap_lock_mutex(void *__map)
 260 {
 261         struct regmap *map = __map;
 262         mutex_lock(&map->mutex);
 263 }
 264
 265 static void regmap_unlock_mutex(void *__map)
 266 {
 267         struct regmap *map = __map;
 268         mutex_unlock(&map->mutex);
 269 }
 270
 271 static void regmap_lock_spinlock(void *__map)
 272 {
 273         struct regmap *map = __map;
 274         spin_lock(&map->spinlock);
 275 }
 276
 277 static void regmap_unlock_spinlock(void *__map)
 278 {
 279         struct regmap *map = __map;
 280         spin_unlock(&map->spinlock);
 281 }
 282
 283 static void dev_get_regmap_release(struct device *dev, void *res)
 284 {
 285         /*
 286          * We don't actually have anything to do here; the goal here
 287          * is not to manage the regmap but to provide a simple way to
 288          * get the regmap back given a struct device.
 289          */
 290 }
 291
 292 static bool _regmap_range_add(struct regmap *map,
 293                               struct regmap_range_node *data)
 294 {
 295         struct rb_root *root = &map->range_tree;
 296         struct rb_node **new = &(root->rb_node), *parent = NULL;
 297
 298         while (*new) {
 299                 struct regmap_range_node *this =
 300                         container_of(*new, struct regmap_range_node, node);
 301
 302                 parent = *new;
 303                 if (data->range_max < this->range_min)
 304                         new = &((*new)->rb_left);
 305                 else if (data->range_min > this->range_max)
 306                         new = &((*new)->rb_right);
 307                 else
 308                         return false;
 309         }
 310
 311         rb_link_node(&data->node, parent, new);
 312         rb_insert_color(&data->node, root);
 313
 314         return true;
 315 }
 316
 317 static struct regmap_range_node *_regmap_range_lookup(struct regmap *map,
 318                                                       unsigned int reg)
 319 {
 320         struct rb_node *node = map->range_tree.rb_node;
 321
 322         while (node) {
 323                 struct regmap_range_node *this =
 324                         container_of(node, struct regmap_range_node, node);
 325
 326                 if (reg < this->range_min)
 327                         node = node->rb_left;
 328                 else if (reg > this->range_max)
 329                         node = node->rb_right;
 330                 else
 331                         return this;
 332         }
 333
 334         return NULL;
 335 }
 336
 337 static void regmap_range_exit(struct regmap *map)
 338 {
 339         struct rb_node *next;
 340         struct regmap_range_node *range_node;
 341
 342         next = rb_first(&map->range_tree);
 343         while (next) {
 344                 range_node = rb_entry(next, struct regmap_range_node, node);
 345                 next = rb_next(&range_node->node);
 346                 rb_erase(&range_node->node, &map->range_tree);
 347                 kfree(range_node);
 348         }
 349
 350         kfree(map->selector_work_buf);
 351 }
 352
 353 /**
 354  * regmap_init(): Initialise register map
 355  *
 356  * @dev: Device that will be interacted with
 357  * @bus: Bus-specific callbacks to use with device
 358  * @bus_context: Data passed to bus-specific callbacks
 359  * @config: Configuration for register map
 360  *
 361  * The return value will be an ERR_PTR() on error or a valid pointer to
 362  * a struct regmap.  This function should generally not be called
 363  * directly, it should be called by bus-specific init functions.
 364  */
 365 struct regmap *regmap_init(struct device *dev,
 366                            const struct regmap_bus *bus,
 367                            void *bus_context,
 368                            const struct regmap_config *config)
 369 {
 370         struct regmap *map, **m;
 371         int ret = -EINVAL;
 372         enum regmap_endian reg_endian, val_endian;
 373         int i, j;
 374
 375         if (!bus || !config)
 376                 goto err;
 377
 378         map = kzalloc(sizeof(*map), GFP_KERNEL);
 379         if (map == NULL) {
 380                 ret = -ENOMEM;
 381                 goto err;
 382         }
 383
 384         if (config->lock && config->unlock) {
 385                 map->lock = config->lock;
 386                 map->unlock = config->unlock;
 387                 map->lock_arg = config->lock_arg;
 388         } else {
 389                 if (bus->fast_io) {
 390                         spin_lock_init(&map->spinlock);
 391                         map->lock = regmap_lock_spinlock;
 392                         map->unlock = regmap_unlock_spinlock;
 393                 } else {
 394                         mutex_init(&map->mutex);
 395                         map->lock = regmap_lock_mutex;
 396                         map->unlock = regmap_unlock_mutex;
 397                 }
 398                 map->lock_arg = map;
 399         }
 400         map->format.reg_bytes = DIV_ROUND_UP(config->reg_bits, 8);
 401         map->format.pad_bytes = config->pad_bits / 8;
 402         map->format.val_bytes = DIV_ROUND_UP(config->val_bits, 8);
 403         map->format.buf_size = DIV_ROUND_UP(config->reg_bits +
 404                         config->val_bits + config->pad_bits, 8);
 405         map->reg_shift = config->pad_bits % 8;
 406         if (config->reg_stride)
 407                 map->reg_stride = config->reg_stride;
 408         else
 409                 map->reg_stride = 1;
 410         map->use_single_rw = config->use_single_rw;
 411         map->dev = dev;
 412         map->bus = bus;
 413         map->bus_context = bus_context;
 414         map->max_register = config->max_register;
 415         map->wr_table = config->wr_table;
 416         map->rd_table = config->rd_table;
 417         map->volatile_table = config->volatile_table;
 418         map->precious_table = config->precious_table;
 419         map->writeable_reg = config->writeable_reg;
 420         map->readable_reg = config->readable_reg;
 421         map->volatile_reg = config->volatile_reg;
 422         map->precious_reg = config->precious_reg;
 423         map->cache_type = config->cache_type;
 424         map->name = config->name;
 425
 426         if (config->read_flag_mask || config->write_flag_mask) {
 427                 map->read_flag_mask = config->read_flag_mask;
 428                 map->write_flag_mask = config->write_flag_mask;
 429         } else {
 430                 map->read_flag_mask = bus->read_flag_mask;
 431         }
 432
 433         reg_endian = config->reg_format_endian;
 434         if (reg_endian == REGMAP_ENDIAN_DEFAULT)
 435                 reg_endian = bus->reg_format_endian_default;
 436         if (reg_endian == REGMAP_ENDIAN_DEFAULT)
 437                 reg_endian = REGMAP_ENDIAN_BIG;
 438
 439         val_endian = config->val_format_endian;
 440         if (val_endian == REGMAP_ENDIAN_DEFAULT)
 441                 val_endian = bus->val_format_endian_default;
 442         if (val_endian == REGMAP_ENDIAN_DEFAULT)
 443                 val_endian = REGMAP_ENDIAN_BIG;
 444
 445         switch (config->reg_bits + map->reg_shift) {
 446         case 2:
 447                 switch (config->val_bits) {
 448                 case 6:
 449                         map->format.format_write = regmap_format_2_6_write;
 450                         break;
 451                 default:
 452                         goto err_map;
 453                 }
 454                 break;
 455
 456         case 4:
 457                 switch (config->val_bits) {
 458                 case 12:
 459                         map->format.format_write = regmap_format_4_12_write;
 460                         break;
 461                 default:
 462                         goto err_map;
 463                 }
 464                 break;
 465
 466         case 7:
 467                 switch (config->val_bits) {
 468                 case 9:
 469                         map->format.format_write = regmap_format_7_9_write;
 470                         break;
 471                 default:
 472                         goto err_map;
 473                 }
 474                 break;
 475
 476         case 10:
 477                 switch (config->val_bits) {
 478                 case 14:
 479                         map->format.format_write = regmap_format_10_14_write;
 480                         break;
 481                 default:
 482                         goto err_map;
 483                 }
 484                 break;
 485
 486         case 8:
 487                 map->format.format_reg = regmap_format_8;
 488                 break;
 489
 490         case 16:
 491                 switch (reg_endian) {
 492                 case REGMAP_ENDIAN_BIG:
 493                         map->format.format_reg = regmap_format_16_be;
 494                         break;
 495                 case REGMAP_ENDIAN_NATIVE:
 496                         map->format.format_reg = regmap_format_16_native;
 497                         break;
 498                 default:
 499                         goto err_map;
 500                 }
 501                 break;
 502
 503         case 32:
 504                 switch (reg_endian) {
 505                 case REGMAP_ENDIAN_BIG:
 506                         map->format.format_reg = regmap_format_32_be;
 507                         break;
 508                 case REGMAP_ENDIAN_NATIVE:
 509                         map->format.format_reg = regmap_format_32_native;
 510                         break;
 511                 default:
 512                         goto err_map;
 513                 }
 514                 break;
 515
 516         default:
 517                 goto err_map;
 518         }
 519
 520         switch (config->val_bits) {
 521         case 8:
 522                 map->format.format_val = regmap_format_8;
 523                 map->format.parse_val = regmap_parse_8;
 524                 break;
 525         case 16:
 526                 switch (val_endian) {
 527                 case REGMAP_ENDIAN_BIG:
 528                         map->format.format_val = regmap_format_16_be;
 529                         map->format.parse_val = regmap_parse_16_be;
 530                         break;
 531                 case REGMAP_ENDIAN_NATIVE:
 532                         map->format.format_val = regmap_format_16_native;
 533                         map->format.parse_val = regmap_parse_16_native;
 534                         break;
 535                 default:
 536                         goto err_map;
 537                 }
 538                 break;
 539         case 24:
 540                 if (val_endian != REGMAP_ENDIAN_BIG)
 541                         goto err_map;
 542                 map->format.format_val = regmap_format_24;
 543                 map->format.parse_val = regmap_parse_24;
 544                 break;
 545         case 32:
 546                 switch (val_endian) {
 547                 case REGMAP_ENDIAN_BIG:
 548                         map->format.format_val = regmap_format_32_be;
 549                         map->format.parse_val = regmap_parse_32_be;
 550                         break;
 551                 case REGMAP_ENDIAN_NATIVE:
 552                         map->format.format_val = regmap_format_32_native;
 553                         map->format.parse_val = regmap_parse_32_native;
 554                         break;
 555                 default:
 556                         goto err_map;
 557                 }
 558                 break;
 559         }
 560
 561         if (map->format.format_write) {
 562                 if ((reg_endian != REGMAP_ENDIAN_BIG) ||
 563                     (val_endian != REGMAP_ENDIAN_BIG))
 564                         goto err_map;
 565                 map->use_single_rw = true;
 566         }
 567
 568         if (!map->format.format_write &&
 569             !(map->format.format_reg && map->format.format_val))
 570                 goto err_map;
 571
 572         map->work_buf = kzalloc(map->format.buf_size, GFP_KERNEL);
 573         if (map->work_buf == NULL) {
 574                 ret = -ENOMEM;
 575                 goto err_map;
 576         }
 577
 578         map->range_tree = RB_ROOT;
 579         for (i = 0; i < config->num_ranges; i++) {
 580                 const struct regmap_range_cfg *range_cfg = &config->ranges[i];
 581                 struct regmap_range_node *new;
 582
 583                 /* Sanity check */
 584                 if (range_cfg->range_max < range_cfg->range_min) {
 585                         dev_err(map->dev, "Invalid range %d: %d < %d\n", i,
 586                                 range_cfg->range_max, range_cfg->range_min);
 587                         goto err_range;
 588                 }
 589
 590                 if (range_cfg->range_max > map->max_register) {
 591                         dev_err(map->dev, "Invalid range %d: %d > %d\n", i,
 592                                 range_cfg->range_max, map->max_register);
 593                         goto err_range;
 594                 }
 595
 596                 if (range_cfg->selector_reg > map->max_register) {
 597                         dev_err(map->dev,
 598                                 "Invalid range %d: selector out of map\n", i);
 599                         goto err_range;
 600                 }
 601
 602                 if (range_cfg->window_len == 0) {
 603                         dev_err(map->dev, "Invalid range %d: window_len 0\n",
 604                                 i);
 605                         goto err_range;
 606                 }
 607
 608                 /* Make sure, that this register range has no selector
 609                    or data window within its boundary */
 610                 for (j = 0; j < config->num_ranges; j++) {
 611                         unsigned sel_reg = config->ranges[j].selector_reg;
 612                         unsigned win_min = config->ranges[j].window_start;
 613                         unsigned win_max = win_min +
 614                                            config->ranges[j].window_len - 1;
 615
 616                         if (range_cfg->range_min <= sel_reg &&
 617                             sel_reg <= range_cfg->range_max) {
 618                                 dev_err(map->dev,
 619                                         "Range %d: selector for %d in window\n",
 620                                         i, j);
 621                                 goto err_range;
 622                         }
 623
 624                         if (!(win_max < range_cfg->range_min ||
 625                               win_min > range_cfg->range_max)) {
 626                                 dev_err(map->dev,
 627                                         "Range %d: window for %d in window\n",
 628                                         i, j);
 629                                 goto err_range;
 630                         }
 631                 }
 632
 633                 new = kzalloc(sizeof(*new), GFP_KERNEL);
 634                 if (new == NULL) {
 635                         ret = -ENOMEM;
 636                         goto err_range;
 637                 }
 638
 639                 new->map = map;
 640                 new->name = range_cfg->name;
 641                 new->range_min = range_cfg->range_min;
 642                 new->range_max = range_cfg->range_max;
 643                 new->selector_reg = range_cfg->selector_reg;
 644                 new->selector_mask = range_cfg->selector_mask;
 645                 new->selector_shift = range_cfg->selector_shift;
 646                 new->window_start = range_cfg->window_start;
 647                 new->window_len = range_cfg->window_len;
 648
 649                 if (_regmap_range_add(map, new) == false) {
 650                         dev_err(map->dev, "Failed to add range %d\n", i);
 651                         kfree(new);
 652                         goto err_range;
 653                 }
 654
 655                 if (map->selector_work_buf == NULL) {
 656                         map->selector_work_buf =
 657                                 kzalloc(map->format.buf_size, GFP_KERNEL);
 658                         if (map->selector_work_buf == NULL) {
 659                                 ret = -ENOMEM;
 660                                 goto err_range;
 661                         }
 662                 }
 663         }
 664
 665         ret = regcache_init(map, config);
 666         if (ret != 0)
 667                 goto err_range;
 668
 669         regmap_debugfs_init(map, config->name);
 670
 671         /* Add a devres resource for dev_get_regmap() */
 672         m = devres_alloc(dev_get_regmap_release, sizeof(*m), GFP_KERNEL);
 673         if (!m) {
 674                 ret = -ENOMEM;
 675                 goto err_debugfs;
 676         }
 677         *m = map;
 678         devres_add(dev, m);
 679
 680         return map;
 681
 682 err_debugfs:
 683         regmap_debugfs_exit(map);
 684         regcache_exit(map);
 685 err_range:
 686         regmap_range_exit(map);
 687         kfree(map->work_buf);
 688 err_map:
 689         kfree(map);
 690 err:
 691         return ERR_PTR(ret);
 692 }
 693 EXPORT_SYMBOL_GPL(regmap_init);
 694
 695 static void devm_regmap_release(struct device *dev, void *res)
 696 {
 697         regmap_exit(*(struct regmap **)res);
 698 }
 699
 700 /**
 701  * devm_regmap_init(): Initialise managed register map
 702  *
 703  * @dev: Device that will be interacted with
 704  * @bus: Bus-specific callbacks to use with device
 705  * @bus_context: Data passed to bus-specific callbacks
 706  * @config: Configuration for register map
 707  *
 708  * The return value will be an ERR_PTR() on error or a valid pointer
 709  * to a struct regmap.  This function should generally not be called
 710  * directly, it should be called by bus-specific init functions.  The
 711  * map will be automatically freed by the device management code.
 712  */
 713 struct regmap *devm_regmap_init(struct device *dev,
 714                                 const struct regmap_bus *bus,
 715                                 void *bus_context,
 716                                 const struct regmap_config *config)
 717 {
 718         struct regmap **ptr, *regmap;
 719
 720         ptr = devres_alloc(devm_regmap_release, sizeof(*ptr), GFP_KERNEL);
 721         if (!ptr)
 722                 return ERR_PTR(-ENOMEM);
 723
 724         regmap = regmap_init(dev, bus, bus_context, config);
 725         if (!IS_ERR(regmap)) {
 726                 *ptr = regmap;
 727                 devres_add(dev, ptr);
 728         } else {
 729                 devres_free(ptr);
 730         }
 731
 732         return regmap;
 733 }
 734 EXPORT_SYMBOL_GPL(devm_regmap_init);
 735
 736 /**
 737  * regmap_reinit_cache(): Reinitialise the current register cache
 738  *
 739  * @map: Register map to operate on.
 740  * @config: New configuration.  Only the cache data will be used.
 741  *
 742  * Discard any existing register cache for the map and initialize a
 743  * new cache.  This can be used to restore the cache to defaults or to
 744  * update the cache configuration to reflect runtime discovery of the
 745  * hardware.
 746  *
 747  * No explicit locking is done here, the user needs to ensure that
 748  * this function will not race with other calls to regmap.
 749  */
 750 int regmap_reinit_cache(struct regmap *map, const struct regmap_config *config)
 751 {
 752         regcache_exit(map);
 753         regmap_debugfs_exit(map);
 754
 755         map->max_register = config->max_register;
 756         map->writeable_reg = config->writeable_reg;
 757         map->readable_reg = config->readable_reg;
 758         map->volatile_reg = config->volatile_reg;
 759         map->precious_reg = config->precious_reg;
 760         map->cache_type = config->cache_type;
 761
 762         regmap_debugfs_init(map, config->name);
 763
 764         map->cache_bypass = false;
 765         map->cache_only = false;
 766
 767         return regcache_init(map, config);
 768 }
 769 EXPORT_SYMBOL_GPL(regmap_reinit_cache);
 770
 771 /**
 772  * regmap_exit(): Free a previously allocated register map
 773  */
 774 void regmap_exit(struct regmap *map)
 775 {
 776         regcache_exit(map);
 777         regmap_debugfs_exit(map);
 778         regmap_range_exit(map);
 779         if (map->bus->free_context)
 780                 map->bus->free_context(map->bus_context);
 781         kfree(map->work_buf);
 782         kfree(map);
 783 }
 784 EXPORT_SYMBOL_GPL(regmap_exit);
 785
 786 static int dev_get_regmap_match(struct device *dev, void *res, void *data)
 787 {
 788         struct regmap **r = res;
 789         if (!r || !*r) {
 790                 WARN_ON(!r || !*r);
 791                 return 0;
 792         }
 793
 794         /* If the user didn't specify a name match any */
 795         if (data)
 796                 return (*r)->name == data;
 797         else
 798                 return 1;
 799 }
 800
 801 /**
 802  * dev_get_regmap(): Obtain the regmap (if any) for a device
 803  *
 804  * @dev: Device to retrieve the map for
 805  * @name: Optional name for the register map, usually NULL.
 806  *
 807  * Returns the regmap for the device if one is present, or NULL.  If
 808  * name is specified then it must match the name specified when
 809  * registering the device, if it is NULL then the first regmap found
 810  * will be used.  Devices with multiple register maps are very rare,
 811  * generic code should normally not need to specify a name.
 812  */
 813 struct regmap *dev_get_regmap(struct device *dev, const char *name)
 814 {
 815         struct regmap **r = devres_find(dev, dev_get_regmap_release,
 816                                         dev_get_regmap_match, (void *)name);
 817
 818         if (!r)
 819                 return NULL;
 820         return *r;
 821 }
 822 EXPORT_SYMBOL_GPL(dev_get_regmap);
 823
 824 static int _regmap_select_page(struct regmap *map, unsigned int *reg,
 825                                struct regmap_range_node *range,
 826                                unsigned int val_num)
 827 {
 828         void *orig_work_buf;
 829         unsigned int win_offset;
 830         unsigned int win_page;
 831         bool page_chg;
 832         int ret;
 833
 834         win_offset = (*reg - range->range_min) % range->window_len;
 835         win_page = (*reg - range->range_min) / range->window_len;
 836
 837         if (val_num > 1) {
 838                 /* Bulk write shouldn't cross range boundary */
 839                 if (*reg + val_num - 1 > range->range_max)
 840                         return -EINVAL;
 841
 842                 /* ... or single page boundary */
 843                 if (val_num > range->window_len - win_offset)
 844                         return -EINVAL;
 845         }
 846
 847         /* It is possible to have selector register inside data window.
 848            In that case, selector register is located on every page and
 849            it needs no page switching, when accessed alone. */
 850         if (val_num > 1 ||
 851             range->window_start + win_offset != range->selector_reg) {
 852                 /* Use separate work_buf during page switching */
 853                 orig_work_buf = map->work_buf;
 854                 map->work_buf = map->selector_work_buf;
 855
 856                 ret = _regmap_update_bits(map, range->selector_reg,
 857                                           range->selector_mask,
 858                                           win_page << range->selector_shift,
 859                                           &page_chg);
 860
 861                 map->work_buf = orig_work_buf;
 862
 863                 if (ret != 0)
 864                         return ret;
 865         }
 866
 867         *reg = range->window_start + win_offset;
 868
 869         return 0;
 870 }
 871
 872 static int _regmap_raw_write(struct regmap *map, unsigned int reg,
 873                              const void *val, size_t val_len)
 874 {
 875         struct regmap_range_node *range;
 876         u8 *u8 = map->work_buf;
 877         void *buf;
 878         int ret = -ENOTSUPP;
 879         size_t len;
 880         int i;
 881
 882         /* Check for unwritable registers before we start */
 883         if (map->writeable_reg)
 884                 for (i = 0; i < val_len / map->format.val_bytes; i++)
 885                         if (!map->writeable_reg(map->dev,
 886                                                 reg + (i * map->reg_stride)))
 887                                 return -EINVAL;
 888
 889         if (!map->cache_bypass && map->format.parse_val) {
 890                 unsigned int ival;
 891                 int val_bytes = map->format.val_bytes;
 892                 for (i = 0; i < val_len / val_bytes; i++) {
 893                         memcpy(map->work_buf, val + (i * val_bytes), val_bytes);
 894                         ival = map->format.parse_val(map->work_buf);
 895                         ret = regcache_write(map, reg + (i * map->reg_stride),
 896                                              ival);
 897                         if (ret) {
 898                                 dev_err(map->dev,
 899                                         "Error in caching of register: %x ret: %d\n",
 900                                         reg + i, ret);
 901                                 return ret;
 902                         }
 903                 }
 904                 if (map->cache_only) {
 905                         map->cache_dirty = true;
 906                         return 0;
 907                 }
 908         }
 909
 910         range = _regmap_range_lookup(map, reg);
 911         if (range) {
 912                 int val_num = val_len / map->format.val_bytes;
 913                 int win_offset = (reg - range->range_min) % range->window_len;
 914                 int win_residue = range->window_len - win_offset;
 915
 916                 /* If the write goes beyond the end of the window split it */
 917                 while (val_num > win_residue) {
 918                         dev_dbg(map->dev, "Writing window %d/%zu\n",
 919                                 win_residue, val_len / map->format.val_bytes);
 920                         ret = _regmap_raw_write(map, reg, val, win_residue *
 921                                                 map->format.val_bytes);
 922                         if (ret != 0)
 923                                 return ret;
 924
 925                         reg += win_residue;
 926                         val_num -= win_residue;
 927                         val += win_residue * map->format.val_bytes;
 928                         val_len -= win_residue * map->format.val_bytes;
 929
 930                         win_offset = (reg - range->range_min) %
 931                                 range->window_len;
 932                         win_residue = range->window_len - win_offset;
 933                 }
 934
 935                 ret = _regmap_select_page(map, &reg, range, val_num);
 936                 if (ret != 0)
 937                         return ret;
 938         }
 939
 940         map->format.format_reg(map->work_buf, reg, map->reg_shift);
 941
 942         u8[0] |= map->write_flag_mask;
 943
 944         trace_regmap_hw_write_start(map->dev, reg,
 945                                     val_len / map->format.val_bytes);
 946
 947         /* If we're doing a single register write we can probably just
 948          * send the work_buf directly, otherwise try to do a gather
 949          * write.
 950          */
 951         if (val == (map->work_buf + map->format.pad_bytes +
 952                     map->format.reg_bytes))
 953                 ret = map->bus->write(map->bus_context, map->work_buf,
 954                                       map->format.reg_bytes +
 955                                       map->format.pad_bytes +
 956                                       val_len);
 957         else if (map->bus->gather_write)
 958                 ret = map->bus->gather_write(map->bus_context, map->work_buf,
 959                                              map->format.reg_bytes +
 960                                              map->format.pad_bytes,
 961                                              val, val_len);
 962
 963         /* If that didn't work fall back on linearising by hand. */
 964         if (ret == -ENOTSUPP) {
 965                 len = map->format.reg_bytes + map->format.pad_bytes + val_len;
 966                 buf = kzalloc(len, GFP_KERNEL);
 967                 if (!buf)
 968                         return -ENOMEM;
 969
 970                 memcpy(buf, map->work_buf, map->format.reg_bytes);
 971                 memcpy(buf + map->format.reg_bytes + map->format.pad_bytes,
 972                        val, val_len);
 973                 ret = map->bus->write(map->bus_context, buf, len);
 974
 975                 kfree(buf);
 976         }
 977
 978         trace_regmap_hw_write_done(map->dev, reg,
 979                                    val_len / map->format.val_bytes);
 980
 981         return ret;
 982 }
 983
 984 int _regmap_write(struct regmap *map, unsigned int reg,
 985                   unsigned int val)
 986 {
 987         struct regmap_range_node *range;
 988         int ret;
 989         BUG_ON(!map->format.format_write && !map->format.format_val);
 990
 991         if (!map->cache_bypass && map->format.format_write) {
 992                 ret = regcache_write(map, reg, val);
 993                 if (ret != 0)
 994                         return ret;
 995                 if (map->cache_only) {
 996                         map->cache_dirty = true;
 997                         return 0;
 998                 }
 999         }
1000
1001 #ifdef LOG_DEVICE
1002         if (strcmp(dev_name(map->dev), LOG_DEVICE) == 0)
1003                 dev_info(map->dev, "%x <= %x\n", reg, val);
1004 #endif
1005
1006         trace_regmap_reg_write(map->dev, reg, val);
1007
1008         if (map->format.format_write) {
1009                 range = _regmap_range_lookup(map, reg);
1010                 if (range) {
1011                         ret = _regmap_select_page(map, &reg, range, 1);
1012                         if (ret != 0)
1013                                 return ret;
1014                 }
1015
1016                 map->format.format_write(map, reg, val);
1017
1018                 trace_regmap_hw_write_start(map->dev, reg, 1);
1019
1020                 ret = map->bus->write(map->bus_context, map->work_buf,
1021                                       map->format.buf_size);
1022
1023                 trace_regmap_hw_write_done(map->dev, reg, 1);
1024
1025                 return ret;
1026         } else {
1027                 map->format.format_val(map->work_buf + map->format.reg_bytes
1028                                        + map->format.pad_bytes, val, 0);
1029                 return _regmap_raw_write(map, reg,
1030                                          map->work_buf +
1031                                          map->format.reg_bytes +
1032                                          map->format.pad_bytes,
1033                                          map->format.val_bytes);
1034         }
1035 }
1036
1037 /**
1038  * regmap_write(): Write a value to a single register
1039  *
1040  * @map: Register map to write to
1041  * @reg: Register to write to
1042  * @val: Value to be written
1043  *
1044  * A value of zero will be returned on success, a negative errno will
1045  * be returned in error cases.
1046  */
1047 int regmap_write(struct regmap *map, unsigned int reg, unsigned int val)
1048 {
1049         int ret;
1050
1051         if (reg % map->reg_stride)
1052                 return -EINVAL;
1053
1054         map->lock(map->lock_arg);
1055
1056         ret = _regmap_write(map, reg, val);
1057
1058         map->unlock(map->lock_arg);
1059
1060         return ret;
1061 }
1062 EXPORT_SYMBOL_GPL(regmap_write);
1063
1064 /**
1065  * regmap_raw_write(): Write raw values to one or more registers
1066  *
1067  * @map: Register map to write to
1068  * @reg: Initial register to write to
1069  * @val: Block of data to be written, laid out for direct transmission to the
1070  *       device
1071  * @val_len: Length of data pointed to by val.
1072  *
1073  * This function is intended to be used for things like firmware
1074  * download where a large block of data needs to be transferred to the
1075  * device.  No formatting will be done on the data provided.
1076  *
1077  * A value of zero will be returned on success, a negative errno will
1078  * be returned in error cases.
1079  */
1080 int regmap_raw_write(struct regmap *map, unsigned int reg,
1081                      const void *val, size_t val_len)
1082 {
1083         int ret;
1084
1085         if (val_len % map->format.val_bytes)
1086                 return -EINVAL;
1087         if (reg % map->reg_stride)
1088                 return -EINVAL;
1089
1090         map->lock(map->lock_arg);
1091
1092         ret = _regmap_raw_write(map, reg, val, val_len);
1093
1094         map->unlock(map->lock_arg);
1095
1096         return ret;
1097 }
1098 EXPORT_SYMBOL_GPL(regmap_raw_write);
1099
1100 /*
1101  * regmap_bulk_write(): Write multiple registers to the device
1102  *
1103  * @map: Register map to write to
1104  * @reg: First register to be write from
1105  * @val: Block of data to be written, in native register size for device
1106  * @val_count: Number of registers to write
1107  *
1108  * This function is intended to be used for writing a large block of
1109  * data to be device either in single transfer or multiple transfer.
1110  *
1111  * A value of zero will be returned on success, a negative errno will
1112  * be returned in error cases.
1113  */
1114 int regmap_bulk_write(struct regmap *map, unsigned int reg, const void *val,
1115                      size_t val_count)
1116 {
1117         int ret = 0, i;
1118         size_t val_bytes = map->format.val_bytes;
1119         void *wval;
1120
1121         if (!map->format.parse_val)
1122                 return -EINVAL;
1123         if (reg % map->reg_stride)
1124                 return -EINVAL;
1125
1126         map->lock(map->lock_arg);
1127
1128         /* No formatting is require if val_byte is 1 */
1129         if (val_bytes == 1) {
1130                 wval = (void *)val;
1131         } else {
1132                 wval = kmemdup(val, val_count * val_bytes, GFP_KERNEL);
1133                 if (!wval) {
1134                         ret = -ENOMEM;
1135                         dev_err(map->dev, "Error in memory allocation\n");
1136                         goto out;
1137                 }
1138                 for (i = 0; i < val_count * val_bytes; i += val_bytes)
1139                         map->format.parse_val(wval + i);
1140         }
1141         /*
1142          * Some devices does not support bulk write, for
1143          * them we have a series of single write operations.
1144          */
1145         if (map->use_single_rw) {
1146                 for (i = 0; i < val_count; i++) {
1147                         ret = regmap_raw_write(map,
1148                                                 reg + (i * map->reg_stride),
1149                                                 val + (i * val_bytes),
1150                                                 val_bytes);
1151                         if (ret != 0)
1152                                 return ret;
1153                 }
1154         } else {
1155                 ret = _regmap_raw_write(map, reg, wval, val_bytes * val_count);
1156         }
1157
1158         if (val_bytes != 1)
1159                 kfree(wval);
1160
1161 out:
1162         map->unlock(map->lock_arg);
1163         return ret;
1164 }
1165 EXPORT_SYMBOL_GPL(regmap_bulk_write);
1166
1167 static int _regmap_raw_read(struct regmap *map, unsigned int reg, void *val,
1168                             unsigned int val_len)
1169 {
1170         struct regmap_range_node *range;
1171         u8 *u8 = map->work_buf;
1172         int ret;
1173
1174         range = _regmap_range_lookup(map, reg);
1175         if (range) {
1176                 ret = _regmap_select_page(map, &reg, range,
1177                                           val_len / map->format.val_bytes);
1178                 if (ret != 0)
1179                         return ret;
1180         }
1181
1182         map->format.format_reg(map->work_buf, reg, map->reg_shift);
1183
1184         /*
1185          * Some buses or devices flag reads by setting the high bits in the
1186          * register addresss; since it's always the high bits for all
1187          * current formats we can do this here rather than in
1188          * formatting.  This may break if we get interesting formats.
1189          */
1190         u8[0] |= map->read_flag_mask;
1191
1192         trace_regmap_hw_read_start(map->dev, reg,
1193                                    val_len / map->format.val_bytes);
1194
1195         ret = map->bus->read(map->bus_context, map->work_buf,
1196                              map->format.reg_bytes + map->format.pad_bytes,
1197                              val, val_len);
1198
1199         trace_regmap_hw_read_done(map->dev, reg,
1200                                   val_len / map->format.val_bytes);
1201
1202         return ret;
1203 }
1204
1205 static int _regmap_read(struct regmap *map, unsigned int reg,
1206                         unsigned int *val)
1207 {
1208         int ret;
1209
1210         if (!map->cache_bypass) {
1211                 ret = regcache_read(map, reg, val);
1212                 if (ret == 0)
1213                         return 0;
1214         }
1215
1216         if (!map->format.parse_val)
1217                 return -EINVAL;
1218
1219         if (map->cache_only)
1220                 return -EBUSY;
1221
1222         ret = _regmap_raw_read(map, reg, map->work_buf, map->format.val_bytes);
1223         if (ret == 0) {
1224                 *val = map->format.parse_val(map->work_buf);
1225
1226 #ifdef LOG_DEVICE
1227                 if (strcmp(dev_name(map->dev), LOG_DEVICE) == 0)
1228                         dev_info(map->dev, "%x => %x\n", reg, *val);
1229 #endif
1230
1231                 trace_regmap_reg_read(map->dev, reg, *val);
1232         }
1233
1234         if (ret == 0 && !map->cache_bypass)
1235                 regcache_write(map, reg, *val);
1236
1237         return ret;
1238 }
1239
1240 /**
1241  * regmap_read(): Read a value from a single register
1242  *
1243  * @map: Register map to write to
1244  * @reg: Register to be read from
1245  * @val: Pointer to store read value
1246  *
1247  * A value of zero will be returned on success, a negative errno will
1248  * be returned in error cases.
1249  */
1250 int regmap_read(struct regmap *map, unsigned int reg, unsigned int *val)
1251 {
1252         int ret;
1253
1254         if (reg % map->reg_stride)
1255                 return -EINVAL;
1256
1257         map->lock(map->lock_arg);
1258
1259         ret = _regmap_read(map, reg, val);
1260
1261         map->unlock(map->lock_arg);
1262
1263         return ret;
1264 }
1265 EXPORT_SYMBOL_GPL(regmap_read);
1266
1267 /**
1268  * regmap_raw_read(): Read raw data from the device
1269  *
1270  * @map: Register map to write to
1271  * @reg: First register to be read from
1272  * @val: Pointer to store read value
1273  * @val_len: Size of data to read
1274  *
1275  * A value of zero will be returned on success, a negative errno will
1276  * be returned in error cases.
1277  */
1278 int regmap_raw_read(struct regmap *map, unsigned int reg, void *val,
1279                     size_t val_len)
1280 {
1281         size_t val_bytes = map->format.val_bytes;
1282         size_t val_count = val_len / val_bytes;
1283         unsigned int v;
1284         int ret, i;
1285
1286         if (val_len % map->format.val_bytes)
1287                 return -EINVAL;
1288         if (reg % map->reg_stride)
1289                 return -EINVAL;
1290
1291         map->lock(map->lock_arg);
1292
1293         if (regmap_volatile_range(map, reg, val_count) || map->cache_bypass ||
1294             map->cache_type == REGCACHE_NONE) {
1295                 /* Physical block read if there's no cache involved */
1296                 ret = _regmap_raw_read(map, reg, val, val_len);
1297
1298         } else {
1299                 /* Otherwise go word by word for the cache; should be low
1300                  * cost as we expect to hit the cache.
1301                  */
1302                 for (i = 0; i < val_count; i++) {
1303                         ret = _regmap_read(map, reg + (i * map->reg_stride),
1304                                            &v);
1305                         if (ret != 0)
1306                                 goto out;
1307
1308                         map->format.format_val(val + (i * val_bytes), v, 0);
1309                 }
1310         }
1311
1312  out:
1313         map->unlock(map->lock_arg);
1314
1315         return ret;
1316 }
1317 EXPORT_SYMBOL_GPL(regmap_raw_read);
1318
1319 /**
1320  * regmap_bulk_read(): Read multiple registers from the device
1321  *
1322  * @map: Register map to write to
1323  * @reg: First register to be read from
1324  * @val: Pointer to store read value, in native register size for device
1325  * @val_count: Number of registers to read
1326  *
1327  * A value of zero will be returned on success, a negative errno will
1328  * be returned in error cases.
1329  */
1330 int regmap_bulk_read(struct regmap *map, unsigned int reg, void *val,
1331                      size_t val_count)
1332 {
1333         int ret, i;
1334         size_t val_bytes = map->format.val_bytes;
1335         bool vol = regmap_volatile_range(map, reg, val_count);
1336
1337         if (!map->format.parse_val)
1338                 return -EINVAL;
1339         if (reg % map->reg_stride)
1340                 return -EINVAL;
1341
1342         if (vol || map->cache_type == REGCACHE_NONE) {
1343                 /*
1344                  * Some devices does not support bulk read, for
1345                  * them we have a series of single read operations.
1346                  */
1347                 if (map->use_single_rw) {
1348                         for (i = 0; i < val_count; i++) {
1349                                 ret = regmap_raw_read(map,
1350                                                 reg + (i * map->reg_stride),
1351                                                 val + (i * val_bytes),
1352                                                 val_bytes);
1353                                 if (ret != 0)
1354                                         return ret;
1355                         }
1356                 } else {
1357                         ret = regmap_raw_read(map, reg, val,
1358                                               val_bytes * val_count);
1359                         if (ret != 0)
1360                                 return ret;
1361                 }
1362
1363                 for (i = 0; i < val_count * val_bytes; i += val_bytes)
1364                         map->format.parse_val(val + i);
1365         } else {
1366                 for (i = 0; i < val_count; i++) {
1367                         unsigned int ival;
1368                         ret = regmap_read(map, reg + (i * map->reg_stride),
1369                                           &ival);
1370                         if (ret != 0)
1371                                 return ret;
1372                         memcpy(val + (i * val_bytes), &ival, val_bytes);
1373                 }
1374         }
1375
1376         return 0;
1377 }
1378 EXPORT_SYMBOL_GPL(regmap_bulk_read);
1379
1380 static int _regmap_update_bits(struct regmap *map, unsigned int reg,
1381                                unsigned int mask, unsigned int val,
1382                                bool *change)
1383 {
1384         int ret;
1385         unsigned int tmp, orig;
1386
1387         ret = _regmap_read(map, reg, &orig);
1388         if (ret != 0)
1389                 return ret;
1390
1391         tmp = orig & ~mask;
1392         tmp |= val & mask;
1393
1394         if (tmp != orig) {
1395                 ret = _regmap_write(map, reg, tmp);
1396                 *change = true;
1397         } else {
1398                 *change = false;
1399         }
1400
1401         return ret;
1402 }
1403
1404 /**
1405  * regmap_update_bits: Perform a read/modify/write cycle on the register map
1406  *
1407  * @map: Register map to update
1408  * @reg: Register to update
1409  * @mask: Bitmask to change
1410  * @val: New value for bitmask
1411  *
1412  * Returns zero for success, a negative number on error.
1413  */
1414 int regmap_update_bits(struct regmap *map, unsigned int reg,
1415                        unsigned int mask, unsigned int val)
1416 {
1417         bool change;
1418         int ret;
1419
1420         map->lock(map->lock_arg);
1421         ret = _regmap_update_bits(map, reg, mask, val, &change);
1422         map->unlock(map->lock_arg);
1423
1424         return ret;
1425 }
1426 EXPORT_SYMBOL_GPL(regmap_update_bits);
1427
1428 /**
1429  * regmap_update_bits_check: Perform a read/modify/write cycle on the
1430  *                           register map and report if updated
1431  *
1432  * @map: Register map to update
1433  * @reg: Register to update
1434  * @mask: Bitmask to change
1435  * @val: New value for bitmask
1436  * @change: Boolean indicating if a write was done
1437  *
1438  * Returns zero for success, a negative number on error.
1439  */
1440 int regmap_update_bits_check(struct regmap *map, unsigned int reg,
1441                              unsigned int mask, unsigned int val,
1442                              bool *change)
1443 {
1444         int ret;
1445
1446         map->lock(map->lock_arg);
1447         ret = _regmap_update_bits(map, reg, mask, val, change);
1448         map->unlock(map->lock_arg);
1449         return ret;
1450 }
1451 EXPORT_SYMBOL_GPL(regmap_update_bits_check);
1452
1453 /**
1454  * regmap_register_patch: Register and apply register updates to be applied
1455  *                        on device initialistion
1456  *
1457  * @map: Register map to apply updates to.
1458  * @regs: Values to update.
1459  * @num_regs: Number of entries in regs.
1460  *
1461  * Register a set of register updates to be applied to the device
1462  * whenever the device registers are synchronised with the cache and
1463  * apply them immediately.  Typically this is used to apply
1464  * corrections to be applied to the device defaults on startup, such
1465  * as the updates some vendors provide to undocumented registers.
1466  */
1467 int regmap_register_patch(struct regmap *map, const struct reg_default *regs,
1468                           int num_regs)
1469 {
1470         int i, ret;
1471         bool bypass;
1472
1473         /* If needed the implementation can be extended to support this */
1474         if (map->patch)
1475                 return -EBUSY;
1476
1477         map->lock(map->lock_arg);
1478
1479         bypass = map->cache_bypass;
1480
1481         map->cache_bypass = true;
1482
1483         /* Write out first; it's useful to apply even if we fail later. */
1484         for (i = 0; i < num_regs; i++) {
1485                 ret = _regmap_write(map, regs[i].reg, regs[i].def);
1486                 if (ret != 0) {
1487                         dev_err(map->dev, "Failed to write %x = %x: %d\n",
1488                                 regs[i].reg, regs[i].def, ret);
1489                         goto out;
1490                 }
1491         }
1492
1493         map->patch = kcalloc(num_regs, sizeof(struct reg_default), GFP_KERNEL);
1494         if (map->patch != NULL) {
1495                 memcpy(map->patch, regs,
1496                        num_regs * sizeof(struct reg_default));
1497                 map->patch_regs = num_regs;
1498         } else {
1499                 ret = -ENOMEM;
1500         }
1501
1502 out:
1503         map->cache_bypass = bypass;
1504
1505         map->unlock(map->lock_arg);
1506
1507         return ret;
1508 }
1509 EXPORT_SYMBOL_GPL(regmap_register_patch);
1510
1511 /*
1512  * regmap_get_val_bytes(): Report the size of a register value
1513  *
1514  * Report the size of a register value, mainly intended to for use by
1515  * generic infrastructure built on top of regmap.
1516  */
1517 int regmap_get_val_bytes(struct regmap *map)
1518 {
1519         if (map->format.format_write)
1520                 return -EINVAL;
1521
1522         return map->format.val_bytes;
1523 }
1524 EXPORT_SYMBOL_GPL(regmap_get_val_bytes);
1525
1526 static int __init regmap_initcall(void)
1527 {
1528         regmap_debugfs_initcall();
1529
1530         return 0;
1531 }
1532 postcore_initcall(regmap_initcall);