Mika Westerberg | ffdcd95 | 2014-10-21 13:33:55 +0200 | [diff] [blame] | 1 | /* |
| 2 | * ACPI device specific properties support. |
| 3 | * |
| 4 | * Copyright (C) 2014, Intel Corporation |
| 5 | * All rights reserved. |
| 6 | * |
| 7 | * Authors: Mika Westerberg <mika.westerberg@linux.intel.com> |
| 8 | * Darren Hart <dvhart@linux.intel.com> |
| 9 | * Rafael J. Wysocki <rafael.j.wysocki@intel.com> |
| 10 | * |
| 11 | * This program is free software; you can redistribute it and/or modify |
| 12 | * it under the terms of the GNU General Public License version 2 as |
| 13 | * published by the Free Software Foundation. |
| 14 | */ |
| 15 | |
| 16 | #include <linux/acpi.h> |
| 17 | #include <linux/device.h> |
| 18 | #include <linux/export.h> |
| 19 | |
| 20 | #include "internal.h" |
| 21 | |
| 22 | /* ACPI _DSD device properties UUID: daffd814-6eba-4d8c-8a91-bc9bbf4aa301 */ |
| 23 | static const u8 prp_uuid[16] = { |
| 24 | 0x14, 0xd8, 0xff, 0xda, 0xba, 0x6e, 0x8c, 0x4d, |
| 25 | 0x8a, 0x91, 0xbc, 0x9b, 0xbf, 0x4a, 0xa3, 0x01 |
| 26 | }; |
| 27 | |
| 28 | static bool acpi_property_value_ok(const union acpi_object *value) |
| 29 | { |
| 30 | int j; |
| 31 | |
| 32 | /* |
| 33 | * The value must be an integer, a string, a reference, or a package |
| 34 | * whose every element must be an integer, a string, or a reference. |
| 35 | */ |
| 36 | switch (value->type) { |
| 37 | case ACPI_TYPE_INTEGER: |
| 38 | case ACPI_TYPE_STRING: |
| 39 | case ACPI_TYPE_LOCAL_REFERENCE: |
| 40 | return true; |
| 41 | |
| 42 | case ACPI_TYPE_PACKAGE: |
| 43 | for (j = 0; j < value->package.count; j++) |
| 44 | switch (value->package.elements[j].type) { |
| 45 | case ACPI_TYPE_INTEGER: |
| 46 | case ACPI_TYPE_STRING: |
| 47 | case ACPI_TYPE_LOCAL_REFERENCE: |
| 48 | continue; |
| 49 | |
| 50 | default: |
| 51 | return false; |
| 52 | } |
| 53 | |
| 54 | return true; |
| 55 | } |
| 56 | return false; |
| 57 | } |
| 58 | |
| 59 | static bool acpi_properties_format_valid(const union acpi_object *properties) |
| 60 | { |
| 61 | int i; |
| 62 | |
| 63 | for (i = 0; i < properties->package.count; i++) { |
| 64 | const union acpi_object *property; |
| 65 | |
| 66 | property = &properties->package.elements[i]; |
| 67 | /* |
| 68 | * Only two elements allowed, the first one must be a string and |
| 69 | * the second one has to satisfy certain conditions. |
| 70 | */ |
| 71 | if (property->package.count != 2 |
| 72 | || property->package.elements[0].type != ACPI_TYPE_STRING |
| 73 | || !acpi_property_value_ok(&property->package.elements[1])) |
| 74 | return false; |
| 75 | } |
| 76 | return true; |
| 77 | } |
| 78 | |
Mika Westerberg | 733e625 | 2014-10-21 13:33:56 +0200 | [diff] [blame] | 79 | static void acpi_init_of_compatible(struct acpi_device *adev) |
| 80 | { |
| 81 | const union acpi_object *of_compatible; |
Mika Westerberg | 733e625 | 2014-10-21 13:33:56 +0200 | [diff] [blame] | 82 | int ret; |
| 83 | |
Rafael J. Wysocki | 5c53b26 | 2015-05-05 15:43:07 +0200 | [diff] [blame] | 84 | ret = acpi_dev_get_property_array(adev, "compatible", ACPI_TYPE_STRING, |
| 85 | &of_compatible); |
| 86 | if (ret) { |
| 87 | ret = acpi_dev_get_property(adev, "compatible", |
| 88 | ACPI_TYPE_STRING, &of_compatible); |
| 89 | if (ret) { |
| 90 | if (adev->parent |
| 91 | && adev->parent->flags.of_compatible_ok) |
| 92 | goto out; |
| 93 | |
| 94 | return; |
| 95 | } |
| 96 | } |
| 97 | adev->data.of_compatible = of_compatible; |
| 98 | |
| 99 | out: |
| 100 | adev->flags.of_compatible_ok = 1; |
| 101 | } |
| 102 | |
Rafael J. Wysocki | bd8191c | 2015-08-27 04:35:14 +0200 | [diff] [blame^] | 103 | static bool acpi_extract_properties(const union acpi_object *desc, |
| 104 | struct acpi_device_data *data) |
Rafael J. Wysocki | 5c53b26 | 2015-05-05 15:43:07 +0200 | [diff] [blame] | 105 | { |
Rafael J. Wysocki | 5c53b26 | 2015-05-05 15:43:07 +0200 | [diff] [blame] | 106 | int i; |
| 107 | |
Mika Westerberg | ffdcd95 | 2014-10-21 13:33:55 +0200 | [diff] [blame] | 108 | if (desc->package.count % 2) |
Rafael J. Wysocki | bd8191c | 2015-08-27 04:35:14 +0200 | [diff] [blame^] | 109 | return false; |
Mika Westerberg | ffdcd95 | 2014-10-21 13:33:55 +0200 | [diff] [blame] | 110 | |
| 111 | /* Look for the device properties UUID. */ |
| 112 | for (i = 0; i < desc->package.count; i += 2) { |
| 113 | const union acpi_object *uuid, *properties; |
| 114 | |
| 115 | uuid = &desc->package.elements[i]; |
| 116 | properties = &desc->package.elements[i + 1]; |
| 117 | |
| 118 | /* |
| 119 | * The first element must be a UUID and the second one must be |
| 120 | * a package. |
| 121 | */ |
| 122 | if (uuid->type != ACPI_TYPE_BUFFER || uuid->buffer.length != 16 |
| 123 | || properties->type != ACPI_TYPE_PACKAGE) |
| 124 | break; |
| 125 | |
| 126 | if (memcmp(uuid->buffer.pointer, prp_uuid, sizeof(prp_uuid))) |
| 127 | continue; |
| 128 | |
| 129 | /* |
| 130 | * We found the matching UUID. Now validate the format of the |
| 131 | * package immediately following it. |
| 132 | */ |
| 133 | if (!acpi_properties_format_valid(properties)) |
| 134 | break; |
| 135 | |
Rafael J. Wysocki | bd8191c | 2015-08-27 04:35:14 +0200 | [diff] [blame^] | 136 | data->properties = properties; |
| 137 | return true; |
Mika Westerberg | ffdcd95 | 2014-10-21 13:33:55 +0200 | [diff] [blame] | 138 | } |
| 139 | |
Rafael J. Wysocki | bd8191c | 2015-08-27 04:35:14 +0200 | [diff] [blame^] | 140 | return false; |
| 141 | } |
| 142 | |
| 143 | void acpi_init_properties(struct acpi_device *adev) |
| 144 | { |
| 145 | struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER }; |
| 146 | struct acpi_hardware_id *hwid; |
| 147 | acpi_status status; |
| 148 | bool acpi_of = false; |
| 149 | |
| 150 | /* |
| 151 | * Check if ACPI_DT_NAMESPACE_HID is present and inthat case we fill in |
| 152 | * Device Tree compatible properties for this device. |
| 153 | */ |
| 154 | list_for_each_entry(hwid, &adev->pnp.ids, list) { |
| 155 | if (!strcmp(hwid->id, ACPI_DT_NAMESPACE_HID)) { |
| 156 | acpi_of = true; |
| 157 | break; |
| 158 | } |
| 159 | } |
| 160 | |
| 161 | status = acpi_evaluate_object_typed(adev->handle, "_DSD", NULL, &buf, |
| 162 | ACPI_TYPE_PACKAGE); |
| 163 | if (ACPI_FAILURE(status)) |
| 164 | goto out; |
| 165 | |
| 166 | if (acpi_extract_properties(buf.pointer, &adev->data)) { |
| 167 | adev->data.pointer = buf.pointer; |
| 168 | if (acpi_of) |
| 169 | acpi_init_of_compatible(adev); |
| 170 | } else { |
| 171 | acpi_handle_debug(adev->handle, "Invalid _DSD data, skipping\n"); |
| 172 | ACPI_FREE(buf.pointer); |
| 173 | } |
Rafael J. Wysocki | 5c53b26 | 2015-05-05 15:43:07 +0200 | [diff] [blame] | 174 | |
| 175 | out: |
| 176 | if (acpi_of && !adev->flags.of_compatible_ok) |
| 177 | acpi_handle_info(adev->handle, |
Rafael J. Wysocki | ee89209 | 2015-05-22 04:24:34 +0200 | [diff] [blame] | 178 | ACPI_DT_NAMESPACE_HID " requires 'compatible' property\n"); |
Mika Westerberg | ffdcd95 | 2014-10-21 13:33:55 +0200 | [diff] [blame] | 179 | } |
| 180 | |
| 181 | void acpi_free_properties(struct acpi_device *adev) |
| 182 | { |
| 183 | ACPI_FREE((void *)adev->data.pointer); |
Mika Westerberg | 733e625 | 2014-10-21 13:33:56 +0200 | [diff] [blame] | 184 | adev->data.of_compatible = NULL; |
Mika Westerberg | ffdcd95 | 2014-10-21 13:33:55 +0200 | [diff] [blame] | 185 | adev->data.pointer = NULL; |
| 186 | adev->data.properties = NULL; |
| 187 | } |
| 188 | |
| 189 | /** |
| 190 | * acpi_dev_get_property - return an ACPI property with given name |
| 191 | * @adev: ACPI device to get property |
| 192 | * @name: Name of the property |
| 193 | * @type: Expected property type |
| 194 | * @obj: Location to store the property value (if not %NULL) |
| 195 | * |
| 196 | * Look up a property with @name and store a pointer to the resulting ACPI |
| 197 | * object at the location pointed to by @obj if found. |
| 198 | * |
| 199 | * Callers must not attempt to free the returned objects. These objects will be |
| 200 | * freed by the ACPI core automatically during the removal of @adev. |
| 201 | * |
| 202 | * Return: %0 if property with @name has been found (success), |
| 203 | * %-EINVAL if the arguments are invalid, |
| 204 | * %-ENODATA if the property doesn't exist, |
| 205 | * %-EPROTO if the property value type doesn't match @type. |
| 206 | */ |
| 207 | int acpi_dev_get_property(struct acpi_device *adev, const char *name, |
| 208 | acpi_object_type type, const union acpi_object **obj) |
| 209 | { |
| 210 | const union acpi_object *properties; |
| 211 | int i; |
| 212 | |
| 213 | if (!adev || !name) |
| 214 | return -EINVAL; |
| 215 | |
| 216 | if (!adev->data.pointer || !adev->data.properties) |
| 217 | return -ENODATA; |
| 218 | |
| 219 | properties = adev->data.properties; |
| 220 | for (i = 0; i < properties->package.count; i++) { |
| 221 | const union acpi_object *propname, *propvalue; |
| 222 | const union acpi_object *property; |
| 223 | |
| 224 | property = &properties->package.elements[i]; |
| 225 | |
| 226 | propname = &property->package.elements[0]; |
| 227 | propvalue = &property->package.elements[1]; |
| 228 | |
| 229 | if (!strcmp(name, propname->string.pointer)) { |
| 230 | if (type != ACPI_TYPE_ANY && propvalue->type != type) |
| 231 | return -EPROTO; |
| 232 | else if (obj) |
| 233 | *obj = propvalue; |
| 234 | |
| 235 | return 0; |
| 236 | } |
| 237 | } |
| 238 | return -ENODATA; |
| 239 | } |
| 240 | EXPORT_SYMBOL_GPL(acpi_dev_get_property); |
| 241 | |
| 242 | /** |
| 243 | * acpi_dev_get_property_array - return an ACPI array property with given name |
| 244 | * @adev: ACPI device to get property |
| 245 | * @name: Name of the property |
| 246 | * @type: Expected type of array elements |
| 247 | * @obj: Location to store a pointer to the property value (if not NULL) |
| 248 | * |
| 249 | * Look up an array property with @name and store a pointer to the resulting |
| 250 | * ACPI object at the location pointed to by @obj if found. |
| 251 | * |
| 252 | * Callers must not attempt to free the returned objects. Those objects will be |
| 253 | * freed by the ACPI core automatically during the removal of @adev. |
| 254 | * |
| 255 | * Return: %0 if array property (package) with @name has been found (success), |
| 256 | * %-EINVAL if the arguments are invalid, |
| 257 | * %-ENODATA if the property doesn't exist, |
| 258 | * %-EPROTO if the property is not a package or the type of its elements |
| 259 | * doesn't match @type. |
| 260 | */ |
| 261 | int acpi_dev_get_property_array(struct acpi_device *adev, const char *name, |
| 262 | acpi_object_type type, |
| 263 | const union acpi_object **obj) |
| 264 | { |
| 265 | const union acpi_object *prop; |
| 266 | int ret, i; |
| 267 | |
| 268 | ret = acpi_dev_get_property(adev, name, ACPI_TYPE_PACKAGE, &prop); |
| 269 | if (ret) |
| 270 | return ret; |
| 271 | |
| 272 | if (type != ACPI_TYPE_ANY) { |
| 273 | /* Check that all elements are of correct type. */ |
| 274 | for (i = 0; i < prop->package.count; i++) |
| 275 | if (prop->package.elements[i].type != type) |
| 276 | return -EPROTO; |
| 277 | } |
| 278 | if (obj) |
| 279 | *obj = prop; |
| 280 | |
| 281 | return 0; |
| 282 | } |
| 283 | EXPORT_SYMBOL_GPL(acpi_dev_get_property_array); |
| 284 | |
| 285 | /** |
| 286 | * acpi_dev_get_property_reference - returns handle to the referenced object |
| 287 | * @adev: ACPI device to get property |
| 288 | * @name: Name of the property |
Mika Westerberg | ffdcd95 | 2014-10-21 13:33:55 +0200 | [diff] [blame] | 289 | * @index: Index of the reference to return |
| 290 | * @args: Location to store the returned reference with optional arguments |
| 291 | * |
| 292 | * Find property with @name, verifify that it is a package containing at least |
| 293 | * one object reference and if so, store the ACPI device object pointer to the |
Rafael J. Wysocki | 60ba032 | 2014-11-05 00:29:07 +0100 | [diff] [blame] | 294 | * target object in @args->adev. If the reference includes arguments, store |
| 295 | * them in the @args->args[] array. |
Mika Westerberg | ffdcd95 | 2014-10-21 13:33:55 +0200 | [diff] [blame] | 296 | * |
Rafael J. Wysocki | 60ba032 | 2014-11-05 00:29:07 +0100 | [diff] [blame] | 297 | * If there's more than one reference in the property value package, @index is |
| 298 | * used to select the one to return. |
Mika Westerberg | ffdcd95 | 2014-10-21 13:33:55 +0200 | [diff] [blame] | 299 | * |
| 300 | * Return: %0 on success, negative error code on failure. |
| 301 | */ |
Rafael J. Wysocki | 60ba032 | 2014-11-05 00:29:07 +0100 | [diff] [blame] | 302 | int acpi_dev_get_property_reference(struct acpi_device *adev, |
| 303 | const char *name, size_t index, |
Mika Westerberg | ffdcd95 | 2014-10-21 13:33:55 +0200 | [diff] [blame] | 304 | struct acpi_reference_args *args) |
| 305 | { |
| 306 | const union acpi_object *element, *end; |
| 307 | const union acpi_object *obj; |
| 308 | struct acpi_device *device; |
| 309 | int ret, idx = 0; |
| 310 | |
| 311 | ret = acpi_dev_get_property(adev, name, ACPI_TYPE_ANY, &obj); |
| 312 | if (ret) |
| 313 | return ret; |
| 314 | |
| 315 | /* |
| 316 | * The simplest case is when the value is a single reference. Just |
| 317 | * return that reference then. |
| 318 | */ |
| 319 | if (obj->type == ACPI_TYPE_LOCAL_REFERENCE) { |
Rafael J. Wysocki | 60ba032 | 2014-11-05 00:29:07 +0100 | [diff] [blame] | 320 | if (index) |
Mika Westerberg | ffdcd95 | 2014-10-21 13:33:55 +0200 | [diff] [blame] | 321 | return -EINVAL; |
| 322 | |
| 323 | ret = acpi_bus_get_device(obj->reference.handle, &device); |
| 324 | if (ret) |
| 325 | return ret; |
| 326 | |
| 327 | args->adev = device; |
| 328 | args->nargs = 0; |
| 329 | return 0; |
| 330 | } |
| 331 | |
| 332 | /* |
| 333 | * If it is not a single reference, then it is a package of |
| 334 | * references followed by number of ints as follows: |
| 335 | * |
| 336 | * Package () { REF, INT, REF, INT, INT } |
| 337 | * |
| 338 | * The index argument is then used to determine which reference |
| 339 | * the caller wants (along with the arguments). |
| 340 | */ |
| 341 | if (obj->type != ACPI_TYPE_PACKAGE || index >= obj->package.count) |
| 342 | return -EPROTO; |
| 343 | |
| 344 | element = obj->package.elements; |
| 345 | end = element + obj->package.count; |
| 346 | |
| 347 | while (element < end) { |
| 348 | u32 nargs, i; |
| 349 | |
| 350 | if (element->type != ACPI_TYPE_LOCAL_REFERENCE) |
| 351 | return -EPROTO; |
| 352 | |
| 353 | ret = acpi_bus_get_device(element->reference.handle, &device); |
| 354 | if (ret) |
| 355 | return -ENODEV; |
| 356 | |
| 357 | element++; |
| 358 | nargs = 0; |
| 359 | |
Rafael J. Wysocki | 60ba032 | 2014-11-05 00:29:07 +0100 | [diff] [blame] | 360 | /* assume following integer elements are all args */ |
| 361 | for (i = 0; element + i < end; i++) { |
| 362 | int type = element[i].type; |
Mika Westerberg | ffdcd95 | 2014-10-21 13:33:55 +0200 | [diff] [blame] | 363 | |
Rafael J. Wysocki | 60ba032 | 2014-11-05 00:29:07 +0100 | [diff] [blame] | 364 | if (type == ACPI_TYPE_INTEGER) |
| 365 | nargs++; |
| 366 | else if (type == ACPI_TYPE_LOCAL_REFERENCE) |
| 367 | break; |
| 368 | else |
Mika Westerberg | ffdcd95 | 2014-10-21 13:33:55 +0200 | [diff] [blame] | 369 | return -EPROTO; |
Mika Westerberg | ffdcd95 | 2014-10-21 13:33:55 +0200 | [diff] [blame] | 370 | } |
| 371 | |
| 372 | if (idx++ == index) { |
| 373 | args->adev = device; |
| 374 | args->nargs = nargs; |
| 375 | for (i = 0; i < nargs; i++) |
| 376 | args->args[i] = element[i].integer.value; |
| 377 | |
| 378 | return 0; |
| 379 | } |
| 380 | |
| 381 | element += nargs; |
| 382 | } |
| 383 | |
| 384 | return -EPROTO; |
| 385 | } |
| 386 | EXPORT_SYMBOL_GPL(acpi_dev_get_property_reference); |
Rafael J. Wysocki | b31384f | 2014-11-04 01:28:56 +0100 | [diff] [blame] | 387 | |
| 388 | int acpi_dev_prop_get(struct acpi_device *adev, const char *propname, |
| 389 | void **valptr) |
| 390 | { |
| 391 | return acpi_dev_get_property(adev, propname, ACPI_TYPE_ANY, |
| 392 | (const union acpi_object **)valptr); |
| 393 | } |
| 394 | |
| 395 | int acpi_dev_prop_read_single(struct acpi_device *adev, const char *propname, |
| 396 | enum dev_prop_type proptype, void *val) |
| 397 | { |
| 398 | const union acpi_object *obj; |
| 399 | int ret; |
| 400 | |
| 401 | if (!val) |
| 402 | return -EINVAL; |
| 403 | |
| 404 | if (proptype >= DEV_PROP_U8 && proptype <= DEV_PROP_U64) { |
| 405 | ret = acpi_dev_get_property(adev, propname, ACPI_TYPE_INTEGER, &obj); |
| 406 | if (ret) |
| 407 | return ret; |
| 408 | |
| 409 | switch (proptype) { |
| 410 | case DEV_PROP_U8: |
| 411 | if (obj->integer.value > U8_MAX) |
| 412 | return -EOVERFLOW; |
| 413 | *(u8 *)val = obj->integer.value; |
| 414 | break; |
| 415 | case DEV_PROP_U16: |
| 416 | if (obj->integer.value > U16_MAX) |
| 417 | return -EOVERFLOW; |
| 418 | *(u16 *)val = obj->integer.value; |
| 419 | break; |
| 420 | case DEV_PROP_U32: |
| 421 | if (obj->integer.value > U32_MAX) |
| 422 | return -EOVERFLOW; |
| 423 | *(u32 *)val = obj->integer.value; |
| 424 | break; |
| 425 | default: |
| 426 | *(u64 *)val = obj->integer.value; |
| 427 | break; |
| 428 | } |
| 429 | } else if (proptype == DEV_PROP_STRING) { |
| 430 | ret = acpi_dev_get_property(adev, propname, ACPI_TYPE_STRING, &obj); |
| 431 | if (ret) |
| 432 | return ret; |
| 433 | |
| 434 | *(char **)val = obj->string.pointer; |
| 435 | } else { |
| 436 | ret = -EINVAL; |
| 437 | } |
| 438 | return ret; |
| 439 | } |
| 440 | |
| 441 | static int acpi_copy_property_array_u8(const union acpi_object *items, u8 *val, |
| 442 | size_t nval) |
| 443 | { |
| 444 | int i; |
| 445 | |
| 446 | for (i = 0; i < nval; i++) { |
| 447 | if (items[i].type != ACPI_TYPE_INTEGER) |
| 448 | return -EPROTO; |
| 449 | if (items[i].integer.value > U8_MAX) |
| 450 | return -EOVERFLOW; |
| 451 | |
| 452 | val[i] = items[i].integer.value; |
| 453 | } |
| 454 | return 0; |
| 455 | } |
| 456 | |
| 457 | static int acpi_copy_property_array_u16(const union acpi_object *items, |
| 458 | u16 *val, size_t nval) |
| 459 | { |
| 460 | int i; |
| 461 | |
| 462 | for (i = 0; i < nval; i++) { |
| 463 | if (items[i].type != ACPI_TYPE_INTEGER) |
| 464 | return -EPROTO; |
| 465 | if (items[i].integer.value > U16_MAX) |
| 466 | return -EOVERFLOW; |
| 467 | |
| 468 | val[i] = items[i].integer.value; |
| 469 | } |
| 470 | return 0; |
| 471 | } |
| 472 | |
| 473 | static int acpi_copy_property_array_u32(const union acpi_object *items, |
| 474 | u32 *val, size_t nval) |
| 475 | { |
| 476 | int i; |
| 477 | |
| 478 | for (i = 0; i < nval; i++) { |
| 479 | if (items[i].type != ACPI_TYPE_INTEGER) |
| 480 | return -EPROTO; |
| 481 | if (items[i].integer.value > U32_MAX) |
| 482 | return -EOVERFLOW; |
| 483 | |
| 484 | val[i] = items[i].integer.value; |
| 485 | } |
| 486 | return 0; |
| 487 | } |
| 488 | |
| 489 | static int acpi_copy_property_array_u64(const union acpi_object *items, |
| 490 | u64 *val, size_t nval) |
| 491 | { |
| 492 | int i; |
| 493 | |
| 494 | for (i = 0; i < nval; i++) { |
| 495 | if (items[i].type != ACPI_TYPE_INTEGER) |
| 496 | return -EPROTO; |
| 497 | |
| 498 | val[i] = items[i].integer.value; |
| 499 | } |
| 500 | return 0; |
| 501 | } |
| 502 | |
| 503 | static int acpi_copy_property_array_string(const union acpi_object *items, |
| 504 | char **val, size_t nval) |
| 505 | { |
| 506 | int i; |
| 507 | |
| 508 | for (i = 0; i < nval; i++) { |
| 509 | if (items[i].type != ACPI_TYPE_STRING) |
| 510 | return -EPROTO; |
| 511 | |
| 512 | val[i] = items[i].string.pointer; |
| 513 | } |
| 514 | return 0; |
| 515 | } |
| 516 | |
| 517 | int acpi_dev_prop_read(struct acpi_device *adev, const char *propname, |
| 518 | enum dev_prop_type proptype, void *val, size_t nval) |
| 519 | { |
| 520 | const union acpi_object *obj; |
| 521 | const union acpi_object *items; |
| 522 | int ret; |
| 523 | |
| 524 | if (val && nval == 1) { |
| 525 | ret = acpi_dev_prop_read_single(adev, propname, proptype, val); |
| 526 | if (!ret) |
| 527 | return ret; |
| 528 | } |
| 529 | |
| 530 | ret = acpi_dev_get_property_array(adev, propname, ACPI_TYPE_ANY, &obj); |
| 531 | if (ret) |
| 532 | return ret; |
| 533 | |
| 534 | if (!val) |
| 535 | return obj->package.count; |
Rafael J. Wysocki | b31384f | 2014-11-04 01:28:56 +0100 | [diff] [blame] | 536 | |
| 537 | if (nval > obj->package.count) |
| 538 | return -EOVERFLOW; |
Andy Shevchenko | 7dc59dc | 2015-08-10 19:56:48 +0300 | [diff] [blame] | 539 | else if (nval <= 0) |
| 540 | return -EINVAL; |
Rafael J. Wysocki | b31384f | 2014-11-04 01:28:56 +0100 | [diff] [blame] | 541 | |
| 542 | items = obj->package.elements; |
Andy Shevchenko | 7dc59dc | 2015-08-10 19:56:48 +0300 | [diff] [blame] | 543 | |
Rafael J. Wysocki | b31384f | 2014-11-04 01:28:56 +0100 | [diff] [blame] | 544 | switch (proptype) { |
| 545 | case DEV_PROP_U8: |
| 546 | ret = acpi_copy_property_array_u8(items, (u8 *)val, nval); |
| 547 | break; |
| 548 | case DEV_PROP_U16: |
| 549 | ret = acpi_copy_property_array_u16(items, (u16 *)val, nval); |
| 550 | break; |
| 551 | case DEV_PROP_U32: |
| 552 | ret = acpi_copy_property_array_u32(items, (u32 *)val, nval); |
| 553 | break; |
| 554 | case DEV_PROP_U64: |
| 555 | ret = acpi_copy_property_array_u64(items, (u64 *)val, nval); |
| 556 | break; |
| 557 | case DEV_PROP_STRING: |
| 558 | ret = acpi_copy_property_array_string(items, (char **)val, nval); |
| 559 | break; |
| 560 | default: |
| 561 | ret = -EINVAL; |
| 562 | break; |
| 563 | } |
| 564 | return ret; |
| 565 | } |