Rafael J. Wysocki | 046d9ce | 2012-11-15 00:30:01 +0100 | [diff] [blame] | 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 | * You should have received a copy of the GNU General Public License along |
| 19 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 20 | * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. |
| 21 | * |
| 22 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
| 23 | */ |
| 24 | |
| 25 | #include <linux/acpi.h> |
| 26 | #include <linux/device.h> |
| 27 | #include <linux/export.h> |
| 28 | #include <linux/ioport.h> |
Rafael J. Wysocki | 8e345c9 | 2012-11-15 00:30:21 +0100 | [diff] [blame] | 29 | #include <linux/slab.h> |
Rafael J. Wysocki | 046d9ce | 2012-11-15 00:30:01 +0100 | [diff] [blame] | 30 | |
| 31 | #ifdef CONFIG_X86 |
| 32 | #define valid_IRQ(i) (((i) != 0) && ((i) != 2)) |
| 33 | #else |
| 34 | #define valid_IRQ(i) (true) |
| 35 | #endif |
| 36 | |
| 37 | static unsigned long acpi_dev_memresource_flags(u64 len, u8 write_protect, |
| 38 | bool window) |
| 39 | { |
| 40 | unsigned long flags = IORESOURCE_MEM; |
| 41 | |
| 42 | if (len == 0) |
| 43 | flags |= IORESOURCE_DISABLED; |
| 44 | |
| 45 | if (write_protect == ACPI_READ_WRITE_MEMORY) |
| 46 | flags |= IORESOURCE_MEM_WRITEABLE; |
| 47 | |
| 48 | if (window) |
| 49 | flags |= IORESOURCE_WINDOW; |
| 50 | |
| 51 | return flags; |
| 52 | } |
| 53 | |
| 54 | static void acpi_dev_get_memresource(struct resource *res, u64 start, u64 len, |
| 55 | u8 write_protect) |
| 56 | { |
| 57 | res->start = start; |
| 58 | res->end = start + len - 1; |
| 59 | res->flags = acpi_dev_memresource_flags(len, write_protect, false); |
| 60 | } |
| 61 | |
| 62 | /** |
| 63 | * acpi_dev_resource_memory - Extract ACPI memory resource information. |
| 64 | * @ares: Input ACPI resource object. |
| 65 | * @res: Output generic resource object. |
| 66 | * |
| 67 | * Check if the given ACPI resource object represents a memory resource and |
| 68 | * if that's the case, use the information in it to populate the generic |
| 69 | * resource object pointed to by @res. |
| 70 | */ |
| 71 | bool acpi_dev_resource_memory(struct acpi_resource *ares, struct resource *res) |
| 72 | { |
| 73 | struct acpi_resource_memory24 *memory24; |
| 74 | struct acpi_resource_memory32 *memory32; |
| 75 | struct acpi_resource_fixed_memory32 *fixed_memory32; |
| 76 | |
| 77 | switch (ares->type) { |
| 78 | case ACPI_RESOURCE_TYPE_MEMORY24: |
| 79 | memory24 = &ares->data.memory24; |
Andy Whitcroft | 867f9d4 | 2014-06-19 11:19:16 +0100 | [diff] [blame] | 80 | if (!memory24->minimum && !memory24->address_length) |
Zhang Rui | b355cee | 2014-02-27 11:37:15 +0800 | [diff] [blame] | 81 | return false; |
Rafael J. Wysocki | 046d9ce | 2012-11-15 00:30:01 +0100 | [diff] [blame] | 82 | acpi_dev_get_memresource(res, memory24->minimum, |
| 83 | memory24->address_length, |
| 84 | memory24->write_protect); |
| 85 | break; |
| 86 | case ACPI_RESOURCE_TYPE_MEMORY32: |
| 87 | memory32 = &ares->data.memory32; |
Andy Whitcroft | 867f9d4 | 2014-06-19 11:19:16 +0100 | [diff] [blame] | 88 | if (!memory32->minimum && !memory32->address_length) |
Zhang Rui | b355cee | 2014-02-27 11:37:15 +0800 | [diff] [blame] | 89 | return false; |
Rafael J. Wysocki | 046d9ce | 2012-11-15 00:30:01 +0100 | [diff] [blame] | 90 | acpi_dev_get_memresource(res, memory32->minimum, |
| 91 | memory32->address_length, |
| 92 | memory32->write_protect); |
| 93 | break; |
| 94 | case ACPI_RESOURCE_TYPE_FIXED_MEMORY32: |
| 95 | fixed_memory32 = &ares->data.fixed_memory32; |
Andy Whitcroft | 867f9d4 | 2014-06-19 11:19:16 +0100 | [diff] [blame] | 96 | if (!fixed_memory32->address && !fixed_memory32->address_length) |
Zhang Rui | b355cee | 2014-02-27 11:37:15 +0800 | [diff] [blame] | 97 | return false; |
Rafael J. Wysocki | 046d9ce | 2012-11-15 00:30:01 +0100 | [diff] [blame] | 98 | acpi_dev_get_memresource(res, fixed_memory32->address, |
| 99 | fixed_memory32->address_length, |
| 100 | fixed_memory32->write_protect); |
| 101 | break; |
| 102 | default: |
| 103 | return false; |
| 104 | } |
| 105 | return true; |
| 106 | } |
| 107 | EXPORT_SYMBOL_GPL(acpi_dev_resource_memory); |
| 108 | |
| 109 | static unsigned int acpi_dev_ioresource_flags(u64 start, u64 end, u8 io_decode, |
| 110 | bool window) |
| 111 | { |
| 112 | int flags = IORESOURCE_IO; |
| 113 | |
| 114 | if (io_decode == ACPI_DECODE_16) |
| 115 | flags |= IORESOURCE_IO_16BIT_ADDR; |
| 116 | |
| 117 | if (start > end || end >= 0x10003) |
| 118 | flags |= IORESOURCE_DISABLED; |
| 119 | |
| 120 | if (window) |
| 121 | flags |= IORESOURCE_WINDOW; |
| 122 | |
| 123 | return flags; |
| 124 | } |
| 125 | |
| 126 | static void acpi_dev_get_ioresource(struct resource *res, u64 start, u64 len, |
| 127 | u8 io_decode) |
| 128 | { |
| 129 | u64 end = start + len - 1; |
| 130 | |
| 131 | res->start = start; |
| 132 | res->end = end; |
| 133 | res->flags = acpi_dev_ioresource_flags(start, end, io_decode, false); |
| 134 | } |
| 135 | |
| 136 | /** |
| 137 | * acpi_dev_resource_io - Extract ACPI I/O resource information. |
| 138 | * @ares: Input ACPI resource object. |
| 139 | * @res: Output generic resource object. |
| 140 | * |
| 141 | * Check if the given ACPI resource object represents an I/O resource and |
| 142 | * if that's the case, use the information in it to populate the generic |
| 143 | * resource object pointed to by @res. |
| 144 | */ |
| 145 | bool acpi_dev_resource_io(struct acpi_resource *ares, struct resource *res) |
| 146 | { |
| 147 | struct acpi_resource_io *io; |
| 148 | struct acpi_resource_fixed_io *fixed_io; |
| 149 | |
| 150 | switch (ares->type) { |
| 151 | case ACPI_RESOURCE_TYPE_IO: |
| 152 | io = &ares->data.io; |
Andy Whitcroft | 867f9d4 | 2014-06-19 11:19:16 +0100 | [diff] [blame] | 153 | if (!io->minimum && !io->address_length) |
Zhang Rui | b355cee | 2014-02-27 11:37:15 +0800 | [diff] [blame] | 154 | return false; |
Rafael J. Wysocki | 046d9ce | 2012-11-15 00:30:01 +0100 | [diff] [blame] | 155 | acpi_dev_get_ioresource(res, io->minimum, |
| 156 | io->address_length, |
| 157 | io->io_decode); |
| 158 | break; |
| 159 | case ACPI_RESOURCE_TYPE_FIXED_IO: |
| 160 | fixed_io = &ares->data.fixed_io; |
Andy Whitcroft | 867f9d4 | 2014-06-19 11:19:16 +0100 | [diff] [blame] | 161 | if (!fixed_io->address && !fixed_io->address_length) |
Zhang Rui | b355cee | 2014-02-27 11:37:15 +0800 | [diff] [blame] | 162 | return false; |
Rafael J. Wysocki | 046d9ce | 2012-11-15 00:30:01 +0100 | [diff] [blame] | 163 | acpi_dev_get_ioresource(res, fixed_io->address, |
| 164 | fixed_io->address_length, |
| 165 | ACPI_DECODE_10); |
| 166 | break; |
| 167 | default: |
| 168 | return false; |
| 169 | } |
| 170 | return true; |
| 171 | } |
| 172 | EXPORT_SYMBOL_GPL(acpi_dev_resource_io); |
| 173 | |
| 174 | /** |
| 175 | * acpi_dev_resource_address_space - Extract ACPI address space information. |
| 176 | * @ares: Input ACPI resource object. |
| 177 | * @res: Output generic resource object. |
| 178 | * |
| 179 | * Check if the given ACPI resource object represents an address space resource |
| 180 | * and if that's the case, use the information in it to populate the generic |
| 181 | * resource object pointed to by @res. |
| 182 | */ |
| 183 | bool acpi_dev_resource_address_space(struct acpi_resource *ares, |
| 184 | struct resource *res) |
| 185 | { |
| 186 | acpi_status status; |
| 187 | struct acpi_resource_address64 addr; |
| 188 | bool window; |
| 189 | u64 len; |
| 190 | u8 io_decode; |
| 191 | |
| 192 | switch (ares->type) { |
| 193 | case ACPI_RESOURCE_TYPE_ADDRESS16: |
| 194 | case ACPI_RESOURCE_TYPE_ADDRESS32: |
| 195 | case ACPI_RESOURCE_TYPE_ADDRESS64: |
| 196 | break; |
| 197 | default: |
| 198 | return false; |
| 199 | } |
| 200 | |
| 201 | status = acpi_resource_to_address64(ares, &addr); |
| 202 | if (ACPI_FAILURE(status)) |
| 203 | return true; |
| 204 | |
| 205 | res->start = addr.minimum; |
| 206 | res->end = addr.maximum; |
| 207 | window = addr.producer_consumer == ACPI_PRODUCER; |
| 208 | |
| 209 | switch(addr.resource_type) { |
| 210 | case ACPI_MEMORY_RANGE: |
| 211 | len = addr.maximum - addr.minimum + 1; |
| 212 | res->flags = acpi_dev_memresource_flags(len, |
| 213 | addr.info.mem.write_protect, |
| 214 | window); |
| 215 | break; |
| 216 | case ACPI_IO_RANGE: |
| 217 | io_decode = addr.granularity == 0xfff ? |
| 218 | ACPI_DECODE_10 : ACPI_DECODE_16; |
| 219 | res->flags = acpi_dev_ioresource_flags(addr.minimum, |
| 220 | addr.maximum, |
| 221 | io_decode, window); |
| 222 | break; |
| 223 | case ACPI_BUS_NUMBER_RANGE: |
| 224 | res->flags = IORESOURCE_BUS; |
| 225 | break; |
| 226 | default: |
| 227 | res->flags = 0; |
| 228 | } |
| 229 | |
| 230 | return true; |
| 231 | } |
| 232 | EXPORT_SYMBOL_GPL(acpi_dev_resource_address_space); |
| 233 | |
| 234 | /** |
| 235 | * acpi_dev_resource_ext_address_space - Extract ACPI address space information. |
| 236 | * @ares: Input ACPI resource object. |
| 237 | * @res: Output generic resource object. |
| 238 | * |
| 239 | * Check if the given ACPI resource object represents an extended address space |
| 240 | * resource and if that's the case, use the information in it to populate the |
| 241 | * generic resource object pointed to by @res. |
| 242 | */ |
| 243 | bool acpi_dev_resource_ext_address_space(struct acpi_resource *ares, |
| 244 | struct resource *res) |
| 245 | { |
| 246 | struct acpi_resource_extended_address64 *ext_addr; |
| 247 | bool window; |
| 248 | u64 len; |
| 249 | u8 io_decode; |
| 250 | |
| 251 | if (ares->type != ACPI_RESOURCE_TYPE_EXTENDED_ADDRESS64) |
| 252 | return false; |
| 253 | |
| 254 | ext_addr = &ares->data.ext_address64; |
| 255 | |
| 256 | res->start = ext_addr->minimum; |
| 257 | res->end = ext_addr->maximum; |
| 258 | window = ext_addr->producer_consumer == ACPI_PRODUCER; |
| 259 | |
| 260 | switch(ext_addr->resource_type) { |
| 261 | case ACPI_MEMORY_RANGE: |
| 262 | len = ext_addr->maximum - ext_addr->minimum + 1; |
| 263 | res->flags = acpi_dev_memresource_flags(len, |
| 264 | ext_addr->info.mem.write_protect, |
| 265 | window); |
| 266 | break; |
| 267 | case ACPI_IO_RANGE: |
| 268 | io_decode = ext_addr->granularity == 0xfff ? |
| 269 | ACPI_DECODE_10 : ACPI_DECODE_16; |
| 270 | res->flags = acpi_dev_ioresource_flags(ext_addr->minimum, |
| 271 | ext_addr->maximum, |
| 272 | io_decode, window); |
| 273 | break; |
| 274 | case ACPI_BUS_NUMBER_RANGE: |
| 275 | res->flags = IORESOURCE_BUS; |
| 276 | break; |
| 277 | default: |
| 278 | res->flags = 0; |
| 279 | } |
| 280 | |
| 281 | return true; |
| 282 | } |
| 283 | EXPORT_SYMBOL_GPL(acpi_dev_resource_ext_address_space); |
| 284 | |
| 285 | /** |
| 286 | * acpi_dev_irq_flags - Determine IRQ resource flags. |
| 287 | * @triggering: Triggering type as provided by ACPI. |
| 288 | * @polarity: Interrupt polarity as provided by ACPI. |
| 289 | * @shareable: Whether or not the interrupt is shareable. |
| 290 | */ |
| 291 | unsigned long acpi_dev_irq_flags(u8 triggering, u8 polarity, u8 shareable) |
| 292 | { |
| 293 | unsigned long flags; |
| 294 | |
| 295 | if (triggering == ACPI_LEVEL_SENSITIVE) |
| 296 | flags = polarity == ACPI_ACTIVE_LOW ? |
| 297 | IORESOURCE_IRQ_LOWLEVEL : IORESOURCE_IRQ_HIGHLEVEL; |
| 298 | else |
| 299 | flags = polarity == ACPI_ACTIVE_LOW ? |
| 300 | IORESOURCE_IRQ_LOWEDGE : IORESOURCE_IRQ_HIGHEDGE; |
| 301 | |
| 302 | if (shareable == ACPI_SHARED) |
| 303 | flags |= IORESOURCE_IRQ_SHAREABLE; |
| 304 | |
| 305 | return flags | IORESOURCE_IRQ; |
| 306 | } |
| 307 | EXPORT_SYMBOL_GPL(acpi_dev_irq_flags); |
| 308 | |
| 309 | static void acpi_dev_irqresource_disabled(struct resource *res, u32 gsi) |
| 310 | { |
| 311 | res->start = gsi; |
| 312 | res->end = gsi; |
| 313 | res->flags = IORESOURCE_IRQ | IORESOURCE_DISABLED; |
| 314 | } |
| 315 | |
| 316 | static void acpi_dev_get_irqresource(struct resource *res, u32 gsi, |
Mika Westerberg | 204ebc0 | 2013-05-20 15:41:45 +0000 | [diff] [blame] | 317 | u8 triggering, u8 polarity, u8 shareable, |
| 318 | bool legacy) |
Rafael J. Wysocki | 046d9ce | 2012-11-15 00:30:01 +0100 | [diff] [blame] | 319 | { |
| 320 | int irq, p, t; |
| 321 | |
| 322 | if (!valid_IRQ(gsi)) { |
| 323 | acpi_dev_irqresource_disabled(res, gsi); |
| 324 | return; |
| 325 | } |
| 326 | |
| 327 | /* |
| 328 | * In IO-APIC mode, use overrided attribute. Two reasons: |
| 329 | * 1. BIOS bug in DSDT |
| 330 | * 2. BIOS uses IO-APIC mode Interrupt Source Override |
Mika Westerberg | 204ebc0 | 2013-05-20 15:41:45 +0000 | [diff] [blame] | 331 | * |
| 332 | * We do this only if we are dealing with IRQ() or IRQNoFlags() |
| 333 | * resource (the legacy ISA resources). With modern ACPI 5 devices |
| 334 | * using extended IRQ descriptors we take the IRQ configuration |
| 335 | * from _CRS directly. |
Rafael J. Wysocki | 046d9ce | 2012-11-15 00:30:01 +0100 | [diff] [blame] | 336 | */ |
Mika Westerberg | 204ebc0 | 2013-05-20 15:41:45 +0000 | [diff] [blame] | 337 | if (legacy && !acpi_get_override_irq(gsi, &t, &p)) { |
Rafael J. Wysocki | 046d9ce | 2012-11-15 00:30:01 +0100 | [diff] [blame] | 338 | u8 trig = t ? ACPI_LEVEL_SENSITIVE : ACPI_EDGE_SENSITIVE; |
| 339 | u8 pol = p ? ACPI_ACTIVE_LOW : ACPI_ACTIVE_HIGH; |
| 340 | |
| 341 | if (triggering != trig || polarity != pol) { |
| 342 | pr_warning("ACPI: IRQ %d override to %s, %s\n", gsi, |
Mika Westerberg | 204ebc0 | 2013-05-20 15:41:45 +0000 | [diff] [blame] | 343 | t ? "level" : "edge", p ? "low" : "high"); |
Rafael J. Wysocki | 046d9ce | 2012-11-15 00:30:01 +0100 | [diff] [blame] | 344 | triggering = trig; |
| 345 | polarity = pol; |
| 346 | } |
| 347 | } |
| 348 | |
| 349 | res->flags = acpi_dev_irq_flags(triggering, polarity, shareable); |
| 350 | irq = acpi_register_gsi(NULL, gsi, triggering, polarity); |
| 351 | if (irq >= 0) { |
| 352 | res->start = irq; |
| 353 | res->end = irq; |
| 354 | } else { |
| 355 | acpi_dev_irqresource_disabled(res, gsi); |
| 356 | } |
| 357 | } |
| 358 | |
| 359 | /** |
| 360 | * acpi_dev_resource_interrupt - Extract ACPI interrupt resource information. |
| 361 | * @ares: Input ACPI resource object. |
| 362 | * @index: Index into the array of GSIs represented by the resource. |
| 363 | * @res: Output generic resource object. |
| 364 | * |
| 365 | * Check if the given ACPI resource object represents an interrupt resource |
| 366 | * and @index does not exceed the resource's interrupt count (true is returned |
| 367 | * in that case regardless of the results of the other checks)). If that's the |
| 368 | * case, register the GSI corresponding to @index from the array of interrupts |
| 369 | * represented by the resource and populate the generic resource object pointed |
| 370 | * to by @res accordingly. If the registration of the GSI is not successful, |
| 371 | * IORESOURCE_DISABLED will be set it that object's flags. |
| 372 | */ |
| 373 | bool acpi_dev_resource_interrupt(struct acpi_resource *ares, int index, |
| 374 | struct resource *res) |
| 375 | { |
| 376 | struct acpi_resource_irq *irq; |
| 377 | struct acpi_resource_extended_irq *ext_irq; |
| 378 | |
| 379 | switch (ares->type) { |
| 380 | case ACPI_RESOURCE_TYPE_IRQ: |
| 381 | /* |
| 382 | * Per spec, only one interrupt per descriptor is allowed in |
| 383 | * _CRS, but some firmware violates this, so parse them all. |
| 384 | */ |
| 385 | irq = &ares->data.irq; |
| 386 | if (index >= irq->interrupt_count) { |
| 387 | acpi_dev_irqresource_disabled(res, 0); |
| 388 | return false; |
| 389 | } |
| 390 | acpi_dev_get_irqresource(res, irq->interrupts[index], |
| 391 | irq->triggering, irq->polarity, |
Mika Westerberg | 204ebc0 | 2013-05-20 15:41:45 +0000 | [diff] [blame] | 392 | irq->sharable, true); |
Rafael J. Wysocki | 046d9ce | 2012-11-15 00:30:01 +0100 | [diff] [blame] | 393 | break; |
| 394 | case ACPI_RESOURCE_TYPE_EXTENDED_IRQ: |
| 395 | ext_irq = &ares->data.extended_irq; |
| 396 | if (index >= ext_irq->interrupt_count) { |
| 397 | acpi_dev_irqresource_disabled(res, 0); |
| 398 | return false; |
| 399 | } |
| 400 | acpi_dev_get_irqresource(res, ext_irq->interrupts[index], |
| 401 | ext_irq->triggering, ext_irq->polarity, |
Mika Westerberg | 204ebc0 | 2013-05-20 15:41:45 +0000 | [diff] [blame] | 402 | ext_irq->sharable, false); |
Rafael J. Wysocki | 046d9ce | 2012-11-15 00:30:01 +0100 | [diff] [blame] | 403 | break; |
| 404 | default: |
| 405 | return false; |
| 406 | } |
| 407 | |
| 408 | return true; |
| 409 | } |
| 410 | EXPORT_SYMBOL_GPL(acpi_dev_resource_interrupt); |
Rafael J. Wysocki | 8e345c9 | 2012-11-15 00:30:21 +0100 | [diff] [blame] | 411 | |
| 412 | /** |
| 413 | * acpi_dev_free_resource_list - Free resource from %acpi_dev_get_resources(). |
| 414 | * @list: The head of the resource list to free. |
| 415 | */ |
| 416 | void acpi_dev_free_resource_list(struct list_head *list) |
| 417 | { |
| 418 | struct resource_list_entry *rentry, *re; |
| 419 | |
| 420 | list_for_each_entry_safe(rentry, re, list, node) { |
| 421 | list_del(&rentry->node); |
| 422 | kfree(rentry); |
| 423 | } |
| 424 | } |
| 425 | EXPORT_SYMBOL_GPL(acpi_dev_free_resource_list); |
| 426 | |
| 427 | struct res_proc_context { |
| 428 | struct list_head *list; |
| 429 | int (*preproc)(struct acpi_resource *, void *); |
| 430 | void *preproc_data; |
| 431 | int count; |
| 432 | int error; |
| 433 | }; |
| 434 | |
| 435 | static acpi_status acpi_dev_new_resource_entry(struct resource *r, |
| 436 | struct res_proc_context *c) |
| 437 | { |
| 438 | struct resource_list_entry *rentry; |
| 439 | |
| 440 | rentry = kmalloc(sizeof(*rentry), GFP_KERNEL); |
| 441 | if (!rentry) { |
| 442 | c->error = -ENOMEM; |
| 443 | return AE_NO_MEMORY; |
| 444 | } |
Rafael J. Wysocki | 8e345c9 | 2012-11-15 00:30:21 +0100 | [diff] [blame] | 445 | rentry->res = *r; |
| 446 | list_add_tail(&rentry->node, c->list); |
| 447 | c->count++; |
| 448 | return AE_OK; |
| 449 | } |
| 450 | |
| 451 | static acpi_status acpi_dev_process_resource(struct acpi_resource *ares, |
| 452 | void *context) |
| 453 | { |
| 454 | struct res_proc_context *c = context; |
| 455 | struct resource r; |
| 456 | int i; |
| 457 | |
| 458 | if (c->preproc) { |
| 459 | int ret; |
| 460 | |
| 461 | ret = c->preproc(ares, c->preproc_data); |
| 462 | if (ret < 0) { |
| 463 | c->error = ret; |
Rafael J. Wysocki | 8a66790 | 2012-11-16 21:55:48 +0100 | [diff] [blame] | 464 | return AE_CTRL_TERMINATE; |
Rafael J. Wysocki | 8e345c9 | 2012-11-15 00:30:21 +0100 | [diff] [blame] | 465 | } else if (ret > 0) { |
| 466 | return AE_OK; |
| 467 | } |
| 468 | } |
| 469 | |
| 470 | memset(&r, 0, sizeof(r)); |
| 471 | |
| 472 | if (acpi_dev_resource_memory(ares, &r) |
| 473 | || acpi_dev_resource_io(ares, &r) |
| 474 | || acpi_dev_resource_address_space(ares, &r) |
| 475 | || acpi_dev_resource_ext_address_space(ares, &r)) |
| 476 | return acpi_dev_new_resource_entry(&r, c); |
| 477 | |
| 478 | for (i = 0; acpi_dev_resource_interrupt(ares, i, &r); i++) { |
| 479 | acpi_status status; |
| 480 | |
| 481 | status = acpi_dev_new_resource_entry(&r, c); |
| 482 | if (ACPI_FAILURE(status)) |
| 483 | return status; |
| 484 | } |
| 485 | |
| 486 | return AE_OK; |
| 487 | } |
| 488 | |
| 489 | /** |
| 490 | * acpi_dev_get_resources - Get current resources of a device. |
| 491 | * @adev: ACPI device node to get the resources for. |
| 492 | * @list: Head of the resultant list of resources (must be empty). |
| 493 | * @preproc: The caller's preprocessing routine. |
| 494 | * @preproc_data: Pointer passed to the caller's preprocessing routine. |
| 495 | * |
| 496 | * Evaluate the _CRS method for the given device node and process its output by |
| 497 | * (1) executing the @preproc() rountine provided by the caller, passing the |
| 498 | * resource pointer and @preproc_data to it as arguments, for each ACPI resource |
| 499 | * returned and (2) converting all of the returned ACPI resources into struct |
| 500 | * resource objects if possible. If the return value of @preproc() in step (1) |
| 501 | * is different from 0, step (2) is not applied to the given ACPI resource and |
| 502 | * if that value is negative, the whole processing is aborted and that value is |
| 503 | * returned as the final error code. |
| 504 | * |
| 505 | * The resultant struct resource objects are put on the list pointed to by |
| 506 | * @list, that must be empty initially, as members of struct resource_list_entry |
| 507 | * objects. Callers of this routine should use %acpi_dev_free_resource_list() to |
| 508 | * free that list. |
| 509 | * |
| 510 | * The number of resources in the output list is returned on success, an error |
| 511 | * code reflecting the error condition is returned otherwise. |
| 512 | */ |
| 513 | int acpi_dev_get_resources(struct acpi_device *adev, struct list_head *list, |
| 514 | int (*preproc)(struct acpi_resource *, void *), |
| 515 | void *preproc_data) |
| 516 | { |
| 517 | struct res_proc_context c; |
Rafael J. Wysocki | 8e345c9 | 2012-11-15 00:30:21 +0100 | [diff] [blame] | 518 | acpi_status status; |
| 519 | |
| 520 | if (!adev || !adev->handle || !list_empty(list)) |
| 521 | return -EINVAL; |
| 522 | |
Jiang Liu | 952c63e | 2013-06-29 00:24:38 +0800 | [diff] [blame] | 523 | if (!acpi_has_method(adev->handle, METHOD_NAME__CRS)) |
Rafael J. Wysocki | 8e345c9 | 2012-11-15 00:30:21 +0100 | [diff] [blame] | 524 | return 0; |
| 525 | |
| 526 | c.list = list; |
| 527 | c.preproc = preproc; |
| 528 | c.preproc_data = preproc_data; |
| 529 | c.count = 0; |
| 530 | c.error = 0; |
| 531 | status = acpi_walk_resources(adev->handle, METHOD_NAME__CRS, |
| 532 | acpi_dev_process_resource, &c); |
| 533 | if (ACPI_FAILURE(status)) { |
| 534 | acpi_dev_free_resource_list(list); |
| 535 | return c.error ? c.error : -EIO; |
| 536 | } |
| 537 | |
| 538 | return c.count; |
| 539 | } |
| 540 | EXPORT_SYMBOL_GPL(acpi_dev_get_resources); |