drivers/acpi/resource.c

   1 /*
   2  * drivers/acpi/resource.c - ACPI device resources interpretation.
   3  *
   4  * Copyright (C) 2012, Intel Corp.
   5  * Author: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
   6  *
   7  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   8  *
   9  *  This program is free software; you can redistribute it and/or modify
  10  *  it under the terms of the GNU General Public License version 2 as published
  11  *  by the Free Software Foundation.
  12  *
  13  *  This program is distributed in the hope that it will be useful, but
  14  *  WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  *  General Public License for more details.
  17  *
  18  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  19  */
  20
  21 #include <linux/acpi.h>
  22 #include <linux/device.h>
  23 #include <linux/export.h>
  24 #include <linux/ioport.h>
  25 #include <linux/slab.h>
  26 #include <linux/irq.h>
  27
  28 #ifdef CONFIG_X86
  29 #define valid_IRQ(i) (((i) != 0) && ((i) != 2))
  30 #else
  31 #define valid_IRQ(i) (true)
  32 #endif
  33
  34 static bool acpi_dev_resource_len_valid(u64 start, u64 end, u64 len, bool io)
  35 {
  36         u64 reslen = end - start + 1;
  37
  38         /*
  39          * CHECKME: len might be required to check versus a minimum
  40          * length as well. 1 for io is fine, but for memory it does
  41          * not make any sense at all.
  42          * Note: some BIOSes report incorrect length for ACPI address space
  43          * descriptor, so remove check of 'reslen == len' to avoid regression.
  44          */
  45         if (len && reslen && start <= end)
  46                 return true;
  47
  48         pr_debug("ACPI: invalid or unassigned resource %s [%016llx - %016llx] length [%016llx]\n",
  49                 io ? "io" : "mem", start, end, len);
  50
  51         return false;
  52 }
  53
  54 static void acpi_dev_memresource_flags(struct resource *res, u64 len,
  55                                        u8 write_protect)
  56 {
  57         res->flags = IORESOURCE_MEM;
  58
  59         if (!acpi_dev_resource_len_valid(res->start, res->end, len, false))
  60                 res->flags |= IORESOURCE_DISABLED | IORESOURCE_UNSET;
  61
  62         if (write_protect == ACPI_READ_WRITE_MEMORY)
  63                 res->flags |= IORESOURCE_MEM_WRITEABLE;
  64 }
  65
  66 static void acpi_dev_get_memresource(struct resource *res, u64 start, u64 len,
  67                                      u8 write_protect)
  68 {
  69         res->start = start;
  70         res->end = start + len - 1;
  71         acpi_dev_memresource_flags(res, len, write_protect);
  72 }
  73
  74 /**
  75  * acpi_dev_resource_memory - Extract ACPI memory resource information.
  76  * @ares: Input ACPI resource object.
  77  * @res: Output generic resource object.
  78  *
  79  * Check if the given ACPI resource object represents a memory resource and
  80  * if that's the case, use the information in it to populate the generic
  81  * resource object pointed to by @res.
  82  *
  83  * Return:
  84  * 1) false with res->flags setting to zero: not the expected resource type
  85  * 2) false with IORESOURCE_DISABLED in res->flags: valid unassigned resource
  86  * 3) true: valid assigned resource
  87  */
  88 bool acpi_dev_resource_memory(struct acpi_resource *ares, struct resource *res)
  89 {
  90         struct acpi_resource_memory24 *memory24;
  91         struct acpi_resource_memory32 *memory32;
  92         struct acpi_resource_fixed_memory32 *fixed_memory32;
  93
  94         switch (ares->type) {
  95         case ACPI_RESOURCE_TYPE_MEMORY24:
  96                 memory24 = &ares->data.memory24;
  97                 acpi_dev_get_memresource(res, memory24->minimum << 8,
  98                                          memory24->address_length << 8,
  99                                          memory24->write_protect);
 100                 break;
 101         case ACPI_RESOURCE_TYPE_MEMORY32:
 102                 memory32 = &ares->data.memory32;
 103                 acpi_dev_get_memresource(res, memory32->minimum,
 104                                          memory32->address_length,
 105                                          memory32->write_protect);
 106                 break;
 107         case ACPI_RESOURCE_TYPE_FIXED_MEMORY32:
 108                 fixed_memory32 = &ares->data.fixed_memory32;
 109                 acpi_dev_get_memresource(res, fixed_memory32->address,
 110                                          fixed_memory32->address_length,
 111                                          fixed_memory32->write_protect);
 112                 break;
 113         default:
 114                 res->flags = 0;
 115                 return false;
 116         }
 117
 118         return !(res->flags & IORESOURCE_DISABLED);
 119 }
 120 EXPORT_SYMBOL_GPL(acpi_dev_resource_memory);
 121
 122 static void acpi_dev_ioresource_flags(struct resource *res, u64 len,
 123                                       u8 io_decode, u8 translation_type)
 124 {
 125         res->flags = IORESOURCE_IO;
 126
 127         if (!acpi_dev_resource_len_valid(res->start, res->end, len, true))
 128                 res->flags |= IORESOURCE_DISABLED | IORESOURCE_UNSET;
 129
 130         if (res->end >= 0x10003)
 131                 res->flags |= IORESOURCE_DISABLED | IORESOURCE_UNSET;
 132
 133         if (io_decode == ACPI_DECODE_16)
 134                 res->flags |= IORESOURCE_IO_16BIT_ADDR;
 135         if (translation_type == ACPI_SPARSE_TRANSLATION)
 136                 res->flags |= IORESOURCE_IO_SPARSE;
 137 }
 138
 139 static void acpi_dev_get_ioresource(struct resource *res, u64 start, u64 len,
 140                                     u8 io_decode)
 141 {
 142         res->start = start;
 143         res->end = start + len - 1;
 144         acpi_dev_ioresource_flags(res, len, io_decode, 0);
 145 }
 146
 147 /**
 148  * acpi_dev_resource_io - Extract ACPI I/O resource information.
 149  * @ares: Input ACPI resource object.
 150  * @res: Output generic resource object.
 151  *
 152  * Check if the given ACPI resource object represents an I/O resource and
 153  * if that's the case, use the information in it to populate the generic
 154  * resource object pointed to by @res.
 155  *
 156  * Return:
 157  * 1) false with res->flags setting to zero: not the expected resource type
 158  * 2) false with IORESOURCE_DISABLED in res->flags: valid unassigned resource
 159  * 3) true: valid assigned resource
 160  */
 161 bool acpi_dev_resource_io(struct acpi_resource *ares, struct resource *res)
 162 {
 163         struct acpi_resource_io *io;
 164         struct acpi_resource_fixed_io *fixed_io;
 165
 166         switch (ares->type) {
 167         case ACPI_RESOURCE_TYPE_IO:
 168                 io = &ares->data.io;
 169                 acpi_dev_get_ioresource(res, io->minimum,
 170                                         io->address_length,
 171                                         io->io_decode);
 172                 break;
 173         case ACPI_RESOURCE_TYPE_FIXED_IO:
 174                 fixed_io = &ares->data.fixed_io;
 175                 acpi_dev_get_ioresource(res, fixed_io->address,
 176                                         fixed_io->address_length,
 177                                         ACPI_DECODE_10);
 178                 break;
 179         default:
 180                 res->flags = 0;
 181                 return false;
 182         }
 183
 184         return !(res->flags & IORESOURCE_DISABLED);
 185 }
 186 EXPORT_SYMBOL_GPL(acpi_dev_resource_io);
 187
 188 static bool acpi_decode_space(struct resource_win *win,
 189                               struct acpi_resource_address *addr,
 190                               struct acpi_address64_attribute *attr)
 191 {
 192         u8 iodec = attr->granularity == 0xfff ? ACPI_DECODE_10 : ACPI_DECODE_16;
 193         bool wp = addr->info.mem.write_protect;
 194         u64 len = attr->address_length;
 195         u64 start, end, offset = 0;
 196         struct resource *res = &win->res;
 197
 198         /*
 199          * Filter out invalid descriptor according to ACPI Spec 5.0, section
 200          * 6.4.3.5 Address Space Resource Descriptors.
 201          */
 202         if ((addr->min_address_fixed != addr->max_address_fixed && len) ||
 203             (addr->min_address_fixed && addr->max_address_fixed && !len))
 204                 pr_debug("ACPI: Invalid address space min_addr_fix %d, max_addr_fix %d, len %llx\n",
 205                          addr->min_address_fixed, addr->max_address_fixed, len);
 206
 207         /*
 208          * For bridges that translate addresses across the bridge,
 209          * translation_offset is the offset that must be added to the
 210          * address on the secondary side to obtain the address on the
 211          * primary side. Non-bridge devices must list 0 for all Address
 212          * Translation offset bits.
 213          */
 214         if (addr->producer_consumer == ACPI_PRODUCER)
 215                 offset = attr->translation_offset;
 216         else if (attr->translation_offset)
 217                 pr_debug("ACPI: translation_offset(%lld) is invalid for non-bridge device.\n",
 218                          attr->translation_offset);
 219         start = attr->minimum + offset;
 220         end = attr->maximum + offset;
 221
 222         win->offset = offset;
 223         res->start = start;
 224         res->end = end;
 225         if (sizeof(resource_size_t) < sizeof(u64) &&
 226             (offset != win->offset || start != res->start || end != res->end)) {
 227                 pr_warn("acpi resource window ([%#llx-%#llx] ignored, not CPU addressable)\n",
 228                         attr->minimum, attr->maximum);
 229                 return false;
 230         }
 231
 232         switch (addr->resource_type) {
 233         case ACPI_MEMORY_RANGE:
 234                 acpi_dev_memresource_flags(res, len, wp);
 235                 break;
 236         case ACPI_IO_RANGE:
 237                 acpi_dev_ioresource_flags(res, len, iodec,
 238                                           addr->info.io.translation_type);
 239                 break;
 240         case ACPI_BUS_NUMBER_RANGE:
 241                 res->flags = IORESOURCE_BUS;
 242                 break;
 243         default:
 244                 return false;
 245         }
 246
 247         if (addr->producer_consumer == ACPI_PRODUCER)
 248                 res->flags |= IORESOURCE_WINDOW;
 249
 250         if (addr->info.mem.caching == ACPI_PREFETCHABLE_MEMORY)
 251                 res->flags |= IORESOURCE_PREFETCH;
 252
 253         return !(res->flags & IORESOURCE_DISABLED);
 254 }
 255
 256 /**
 257  * acpi_dev_resource_address_space - Extract ACPI address space information.
 258  * @ares: Input ACPI resource object.
 259  * @win: Output generic resource object.
 260  *
 261  * Check if the given ACPI resource object represents an address space resource
 262  * and if that's the case, use the information in it to populate the generic
 263  * resource object pointed to by @win.
 264  *
 265  * Return:
 266  * 1) false with win->res.flags setting to zero: not the expected resource type
 267  * 2) false with IORESOURCE_DISABLED in win->res.flags: valid unassigned
 268  *    resource
 269  * 3) true: valid assigned resource
 270  */
 271 bool acpi_dev_resource_address_space(struct acpi_resource *ares,
 272                                      struct resource_win *win)
 273 {
 274         struct acpi_resource_address64 addr;
 275
 276         win->res.flags = 0;
 277         if (ACPI_FAILURE(acpi_resource_to_address64(ares, &addr)))
 278                 return false;
 279
 280         return acpi_decode_space(win, (struct acpi_resource_address *)&addr,
 281                                  &addr.address);
 282 }
 283 EXPORT_SYMBOL_GPL(acpi_dev_resource_address_space);
 284
 285 /**
 286  * acpi_dev_resource_ext_address_space - Extract ACPI address space information.
 287  * @ares: Input ACPI resource object.
 288  * @win: Output generic resource object.
 289  *
 290  * Check if the given ACPI resource object represents an extended address space
 291  * resource and if that's the case, use the information in it to populate the
 292  * generic resource object pointed to by @win.
 293  *
 294  * Return:
 295  * 1) false with win->res.flags setting to zero: not the expected resource type
 296  * 2) false with IORESOURCE_DISABLED in win->res.flags: valid unassigned
 297  *    resource
 298  * 3) true: valid assigned resource
 299  */
 300 bool acpi_dev_resource_ext_address_space(struct acpi_resource *ares,
 301                                          struct resource_win *win)
 302 {
 303         struct acpi_resource_extended_address64 *ext_addr;
 304
 305         win->res.flags = 0;
 306         if (ares->type != ACPI_RESOURCE_TYPE_EXTENDED_ADDRESS64)
 307                 return false;
 308
 309         ext_addr = &ares->data.ext_address64;
 310
 311         return acpi_decode_space(win, (struct acpi_resource_address *)ext_addr,
 312                                  &ext_addr->address);
 313 }
 314 EXPORT_SYMBOL_GPL(acpi_dev_resource_ext_address_space);
 315
 316 /**
 317  * acpi_dev_irq_flags - Determine IRQ resource flags.
 318  * @triggering: Triggering type as provided by ACPI.
 319  * @polarity: Interrupt polarity as provided by ACPI.
 320  * @shareable: Whether or not the interrupt is shareable.
 321  */
 322 unsigned long acpi_dev_irq_flags(u8 triggering, u8 polarity, u8 shareable)
 323 {
 324         unsigned long flags;
 325
 326         if (triggering == ACPI_LEVEL_SENSITIVE)
 327                 flags = polarity == ACPI_ACTIVE_LOW ?
 328                         IORESOURCE_IRQ_LOWLEVEL : IORESOURCE_IRQ_HIGHLEVEL;
 329         else
 330                 flags = polarity == ACPI_ACTIVE_LOW ?
 331                         IORESOURCE_IRQ_LOWEDGE : IORESOURCE_IRQ_HIGHEDGE;
 332
 333         if (shareable == ACPI_SHARED)
 334                 flags |= IORESOURCE_IRQ_SHAREABLE;
 335
 336         return flags | IORESOURCE_IRQ;
 337 }
 338 EXPORT_SYMBOL_GPL(acpi_dev_irq_flags);
 339
 340 /**
 341  * acpi_dev_get_irq_type - Determine irq type.
 342  * @triggering: Triggering type as provided by ACPI.
 343  * @polarity: Interrupt polarity as provided by ACPI.
 344  */
 345 unsigned int acpi_dev_get_irq_type(int triggering, int polarity)
 346 {
 347         switch (polarity) {
 348         case ACPI_ACTIVE_LOW:
 349                 return triggering == ACPI_EDGE_SENSITIVE ?
 350                        IRQ_TYPE_EDGE_FALLING :
 351                        IRQ_TYPE_LEVEL_LOW;
 352         case ACPI_ACTIVE_HIGH:
 353                 return triggering == ACPI_EDGE_SENSITIVE ?
 354                        IRQ_TYPE_EDGE_RISING :
 355                        IRQ_TYPE_LEVEL_HIGH;
 356         case ACPI_ACTIVE_BOTH:
 357                 if (triggering == ACPI_EDGE_SENSITIVE)
 358                         return IRQ_TYPE_EDGE_BOTH;
 359         default:
 360                 return IRQ_TYPE_NONE;
 361         }
 362 }
 363 EXPORT_SYMBOL_GPL(acpi_dev_get_irq_type);
 364
 365 static void acpi_dev_irqresource_disabled(struct resource *res, u32 gsi)
 366 {
 367         res->start = gsi;
 368         res->end = gsi;
 369         res->flags = IORESOURCE_IRQ | IORESOURCE_DISABLED | IORESOURCE_UNSET;
 370 }
 371
 372 static void acpi_dev_get_irqresource(struct resource *res, u32 gsi,
 373                                      u8 triggering, u8 polarity, u8 shareable,
 374                                      bool legacy)
 375 {
 376         int irq, p, t;
 377
 378         if (!valid_IRQ(gsi)) {
 379                 acpi_dev_irqresource_disabled(res, gsi);
 380                 return;
 381         }
 382
 383         /*
 384          * In IO-APIC mode, use overrided attribute. Two reasons:
 385          * 1. BIOS bug in DSDT
 386          * 2. BIOS uses IO-APIC mode Interrupt Source Override
 387          *
 388          * We do this only if we are dealing with IRQ() or IRQNoFlags()
 389          * resource (the legacy ISA resources). With modern ACPI 5 devices
 390          * using extended IRQ descriptors we take the IRQ configuration
 391          * from _CRS directly.
 392          */
 393         if (legacy && !acpi_get_override_irq(gsi, &t, &p)) {
 394                 u8 trig = t ? ACPI_LEVEL_SENSITIVE : ACPI_EDGE_SENSITIVE;
 395                 u8 pol = p ? ACPI_ACTIVE_LOW : ACPI_ACTIVE_HIGH;
 396
 397                 if (triggering != trig || polarity != pol) {
 398                         pr_warning("ACPI: IRQ %d override to %s, %s\n", gsi,
 399                                    t ? "level" : "edge", p ? "low" : "high");
 400                         triggering = trig;
 401                         polarity = pol;
 402                 }
 403         }
 404
 405         res->flags = acpi_dev_irq_flags(triggering, polarity, shareable);
 406         irq = acpi_register_gsi(NULL, gsi, triggering, polarity);
 407         if (irq >= 0) {
 408                 res->start = irq;
 409                 res->end = irq;
 410         } else {
 411                 acpi_dev_irqresource_disabled(res, gsi);
 412         }
 413 }
 414
 415 /**
 416  * acpi_dev_resource_interrupt - Extract ACPI interrupt resource information.
 417  * @ares: Input ACPI resource object.
 418  * @index: Index into the array of GSIs represented by the resource.
 419  * @res: Output generic resource object.
 420  *
 421  * Check if the given ACPI resource object represents an interrupt resource
 422  * and @index does not exceed the resource's interrupt count (true is returned
 423  * in that case regardless of the results of the other checks)).  If that's the
 424  * case, register the GSI corresponding to @index from the array of interrupts
 425  * represented by the resource and populate the generic resource object pointed
 426  * to by @res accordingly.  If the registration of the GSI is not successful,
 427  * IORESOURCE_DISABLED will be set it that object's flags.
 428  *
 429  * Return:
 430  * 1) false with res->flags setting to zero: not the expected resource type
 431  * 2) false with IORESOURCE_DISABLED in res->flags: valid unassigned resource
 432  * 3) true: valid assigned resource
 433  */
 434 bool acpi_dev_resource_interrupt(struct acpi_resource *ares, int index,
 435                                  struct resource *res)
 436 {
 437         struct acpi_resource_irq *irq;
 438         struct acpi_resource_extended_irq *ext_irq;
 439
 440         switch (ares->type) {
 441         case ACPI_RESOURCE_TYPE_IRQ:
 442                 /*
 443                  * Per spec, only one interrupt per descriptor is allowed in
 444                  * _CRS, but some firmware violates this, so parse them all.
 445                  */
 446                 irq = &ares->data.irq;
 447                 if (index >= irq->interrupt_count) {
 448                         acpi_dev_irqresource_disabled(res, 0);
 449                         return false;
 450                 }
 451                 acpi_dev_get_irqresource(res, irq->interrupts[index],
 452                                          irq->triggering, irq->polarity,
 453                                          irq->sharable, true);
 454                 break;
 455         case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
 456                 ext_irq = &ares->data.extended_irq;
 457                 if (index >= ext_irq->interrupt_count) {
 458                         acpi_dev_irqresource_disabled(res, 0);
 459                         return false;
 460                 }
 461                 acpi_dev_get_irqresource(res, ext_irq->interrupts[index],
 462                                          ext_irq->triggering, ext_irq->polarity,
 463                                          ext_irq->sharable, false);
 464                 break;
 465         default:
 466                 res->flags = 0;
 467                 return false;
 468         }
 469
 470         return true;
 471 }
 472 EXPORT_SYMBOL_GPL(acpi_dev_resource_interrupt);
 473
 474 /**
 475  * acpi_dev_free_resource_list - Free resource from %acpi_dev_get_resources().
 476  * @list: The head of the resource list to free.
 477  */
 478 void acpi_dev_free_resource_list(struct list_head *list)
 479 {
 480         resource_list_free(list);
 481 }
 482 EXPORT_SYMBOL_GPL(acpi_dev_free_resource_list);
 483
 484 struct res_proc_context {
 485         struct list_head *list;
 486         int (*preproc)(struct acpi_resource *, void *);
 487         void *preproc_data;
 488         int count;
 489         int error;
 490 };
 491
 492 static acpi_status acpi_dev_new_resource_entry(struct resource_win *win,
 493                                                struct res_proc_context *c)
 494 {
 495         struct resource_entry *rentry;
 496
 497         rentry = resource_list_create_entry(NULL, 0);
 498         if (!rentry) {
 499                 c->error = -ENOMEM;
 500                 return AE_NO_MEMORY;
 501         }
 502         *rentry->res = win->res;
 503         rentry->offset = win->offset;
 504         resource_list_add_tail(rentry, c->list);
 505         c->count++;
 506         return AE_OK;
 507 }
 508
 509 static acpi_status acpi_dev_process_resource(struct acpi_resource *ares,
 510                                              void *context)
 511 {
 512         struct res_proc_context *c = context;
 513         struct resource_win win;
 514         struct resource *res = &win.res;
 515         int i;
 516
 517         if (c->preproc) {
 518                 int ret;
 519
 520                 ret = c->preproc(ares, c->preproc_data);
 521                 if (ret < 0) {
 522                         c->error = ret;
 523                         return AE_CTRL_TERMINATE;
 524                 } else if (ret > 0) {
 525                         return AE_OK;
 526                 }
 527         }
 528
 529         memset(&win, 0, sizeof(win));
 530
 531         if (acpi_dev_resource_memory(ares, res)
 532             || acpi_dev_resource_io(ares, res)
 533             || acpi_dev_resource_address_space(ares, &win)
 534             || acpi_dev_resource_ext_address_space(ares, &win))
 535                 return acpi_dev_new_resource_entry(&win, c);
 536
 537         for (i = 0; acpi_dev_resource_interrupt(ares, i, res); i++) {
 538                 acpi_status status;
 539
 540                 status = acpi_dev_new_resource_entry(&win, c);
 541                 if (ACPI_FAILURE(status))
 542                         return status;
 543         }
 544
 545         return AE_OK;
 546 }
 547
 548 /**
 549  * acpi_dev_get_resources - Get current resources of a device.
 550  * @adev: ACPI device node to get the resources for.
 551  * @list: Head of the resultant list of resources (must be empty).
 552  * @preproc: The caller's preprocessing routine.
 553  * @preproc_data: Pointer passed to the caller's preprocessing routine.
 554  *
 555  * Evaluate the _CRS method for the given device node and process its output by
 556  * (1) executing the @preproc() rountine provided by the caller, passing the
 557  * resource pointer and @preproc_data to it as arguments, for each ACPI resource
 558  * returned and (2) converting all of the returned ACPI resources into struct
 559  * resource objects if possible.  If the return value of @preproc() in step (1)
 560  * is different from 0, step (2) is not applied to the given ACPI resource and
 561  * if that value is negative, the whole processing is aborted and that value is
 562  * returned as the final error code.
 563  *
 564  * The resultant struct resource objects are put on the list pointed to by
 565  * @list, that must be empty initially, as members of struct resource_entry
 566  * objects.  Callers of this routine should use %acpi_dev_free_resource_list() to
 567  * free that list.
 568  *
 569  * The number of resources in the output list is returned on success, an error
 570  * code reflecting the error condition is returned otherwise.
 571  */
 572 int acpi_dev_get_resources(struct acpi_device *adev, struct list_head *list,
 573                            int (*preproc)(struct acpi_resource *, void *),
 574                            void *preproc_data)
 575 {
 576         struct res_proc_context c;
 577         acpi_status status;
 578
 579         if (!adev || !adev->handle || !list_empty(list))
 580                 return -EINVAL;
 581
 582         if (!acpi_has_method(adev->handle, METHOD_NAME__CRS))
 583                 return 0;
 584
 585         c.list = list;
 586         c.preproc = preproc;
 587         c.preproc_data = preproc_data;
 588         c.count = 0;
 589         c.error = 0;
 590         status = acpi_walk_resources(adev->handle, METHOD_NAME__CRS,
 591                                      acpi_dev_process_resource, &c);
 592         if (ACPI_FAILURE(status)) {
 593                 acpi_dev_free_resource_list(list);
 594                 return c.error ? c.error : -EIO;
 595         }
 596
 597         return c.count;
 598 }
 599 EXPORT_SYMBOL_GPL(acpi_dev_get_resources);
 600
 601 /**
 602  * acpi_dev_filter_resource_type - Filter ACPI resource according to resource
 603  *                                 types
 604  * @ares: Input ACPI resource object.
 605  * @types: Valid resource types of IORESOURCE_XXX
 606  *
 607  * This is a helper function to support acpi_dev_get_resources(), which filters
 608  * ACPI resource objects according to resource types.
 609  */
 610 int acpi_dev_filter_resource_type(struct acpi_resource *ares,
 611                                   unsigned long types)
 612 {
 613         unsigned long type = 0;
 614
 615         switch (ares->type) {
 616         case ACPI_RESOURCE_TYPE_MEMORY24:
 617         case ACPI_RESOURCE_TYPE_MEMORY32:
 618         case ACPI_RESOURCE_TYPE_FIXED_MEMORY32:
 619                 type = IORESOURCE_MEM;
 620                 break;
 621         case ACPI_RESOURCE_TYPE_IO:
 622         case ACPI_RESOURCE_TYPE_FIXED_IO:
 623                 type = IORESOURCE_IO;
 624                 break;
 625         case ACPI_RESOURCE_TYPE_IRQ:
 626         case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
 627                 type = IORESOURCE_IRQ;
 628                 break;
 629         case ACPI_RESOURCE_TYPE_DMA:
 630         case ACPI_RESOURCE_TYPE_FIXED_DMA:
 631                 type = IORESOURCE_DMA;
 632                 break;
 633         case ACPI_RESOURCE_TYPE_GENERIC_REGISTER:
 634                 type = IORESOURCE_REG;
 635                 break;
 636         case ACPI_RESOURCE_TYPE_ADDRESS16:
 637         case ACPI_RESOURCE_TYPE_ADDRESS32:
 638         case ACPI_RESOURCE_TYPE_ADDRESS64:
 639         case ACPI_RESOURCE_TYPE_EXTENDED_ADDRESS64:
 640                 if (ares->data.address.resource_type == ACPI_MEMORY_RANGE)
 641                         type = IORESOURCE_MEM;
 642                 else if (ares->data.address.resource_type == ACPI_IO_RANGE)
 643                         type = IORESOURCE_IO;
 644                 else if (ares->data.address.resource_type ==
 645                          ACPI_BUS_NUMBER_RANGE)
 646                         type = IORESOURCE_BUS;
 647                 break;
 648         default:
 649                 break;
 650         }
 651
 652         return (type & types) ? 0 : 1;
 653 }
 654 EXPORT_SYMBOL_GPL(acpi_dev_filter_resource_type);