1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Linux I2C core ACPI support code 4 * 5 * Copyright (C) 2014 Intel Corp, Author: Lan Tianyu <tianyu.lan@intel.com> 6 */ 7 8 #include <linux/acpi.h> 9 #include <linux/device.h> 10 #include <linux/err.h> 11 #include <linux/i2c.h> 12 #include <linux/list.h> 13 #include <linux/module.h> 14 #include <linux/slab.h> 15 16 #include "i2c-core.h" 17 18 struct i2c_acpi_handler_data { 19 struct acpi_connection_info info; 20 struct i2c_adapter *adapter; 21 }; 22 23 struct gsb_buffer { 24 u8 status; 25 u8 len; 26 union { 27 u16 wdata; 28 u8 bdata; 29 u8 data[0]; 30 }; 31 } __packed; 32 33 struct i2c_acpi_lookup { 34 struct i2c_board_info *info; 35 acpi_handle adapter_handle; 36 acpi_handle device_handle; 37 acpi_handle search_handle; 38 int n; 39 int index; 40 u32 speed; 41 u32 min_speed; 42 u32 force_speed; 43 }; 44 45 /** 46 * i2c_acpi_get_i2c_resource - Gets I2cSerialBus resource if type matches 47 * @ares: ACPI resource 48 * @i2c: Pointer to I2cSerialBus resource will be returned here 49 * 50 * Checks if the given ACPI resource is of type I2cSerialBus. 51 * In this case, returns a pointer to it to the caller. 52 * 53 * Returns true if resource type is of I2cSerialBus, otherwise false. 54 */ 55 bool i2c_acpi_get_i2c_resource(struct acpi_resource *ares, 56 struct acpi_resource_i2c_serialbus **i2c) 57 { 58 struct acpi_resource_i2c_serialbus *sb; 59 60 if (ares->type != ACPI_RESOURCE_TYPE_SERIAL_BUS) 61 return false; 62 63 sb = &ares->data.i2c_serial_bus; 64 if (sb->type != ACPI_RESOURCE_SERIAL_TYPE_I2C) 65 return false; 66 67 *i2c = sb; 68 return true; 69 } 70 EXPORT_SYMBOL_GPL(i2c_acpi_get_i2c_resource); 71 72 static int i2c_acpi_resource_count(struct acpi_resource *ares, void *data) 73 { 74 struct acpi_resource_i2c_serialbus *sb; 75 int *count = data; 76 77 if (i2c_acpi_get_i2c_resource(ares, &sb)) 78 *count = *count + 1; 79 80 return 1; 81 } 82 83 /** 84 * i2c_acpi_client_count - Count the number of I2cSerialBus resources 85 * @adev: ACPI device 86 * 87 * Returns the number of I2cSerialBus resources in the ACPI-device's 88 * resource-list; or a negative error code. 89 */ 90 int i2c_acpi_client_count(struct acpi_device *adev) 91 { 92 int ret, count = 0; 93 LIST_HEAD(r); 94 95 ret = acpi_dev_get_resources(adev, &r, i2c_acpi_resource_count, &count); 96 if (ret < 0) 97 return ret; 98 99 acpi_dev_free_resource_list(&r); 100 return count; 101 } 102 EXPORT_SYMBOL_GPL(i2c_acpi_client_count); 103 104 static int i2c_acpi_fill_info(struct acpi_resource *ares, void *data) 105 { 106 struct i2c_acpi_lookup *lookup = data; 107 struct i2c_board_info *info = lookup->info; 108 struct acpi_resource_i2c_serialbus *sb; 109 acpi_status status; 110 111 if (info->addr || !i2c_acpi_get_i2c_resource(ares, &sb)) 112 return 1; 113 114 if (lookup->index != -1 && lookup->n++ != lookup->index) 115 return 1; 116 117 status = acpi_get_handle(lookup->device_handle, 118 sb->resource_source.string_ptr, 119 &lookup->adapter_handle); 120 if (ACPI_FAILURE(status)) 121 return 1; 122 123 info->addr = sb->slave_address; 124 lookup->speed = sb->connection_speed; 125 if (sb->access_mode == ACPI_I2C_10BIT_MODE) 126 info->flags |= I2C_CLIENT_TEN; 127 128 return 1; 129 } 130 131 static const struct acpi_device_id i2c_acpi_ignored_device_ids[] = { 132 /* 133 * ACPI video acpi_devices, which are handled by the acpi-video driver 134 * sometimes contain a SERIAL_TYPE_I2C ACPI resource, ignore these. 135 */ 136 { ACPI_VIDEO_HID, 0 }, 137 {} 138 }; 139 140 static int i2c_acpi_do_lookup(struct acpi_device *adev, 141 struct i2c_acpi_lookup *lookup) 142 { 143 struct i2c_board_info *info = lookup->info; 144 struct list_head resource_list; 145 int ret; 146 147 if (acpi_bus_get_status(adev)) 148 return -EINVAL; 149 150 if (!acpi_dev_ready_for_enumeration(adev)) 151 return -ENODEV; 152 153 if (acpi_match_device_ids(adev, i2c_acpi_ignored_device_ids) == 0) 154 return -ENODEV; 155 156 memset(info, 0, sizeof(*info)); 157 lookup->device_handle = acpi_device_handle(adev); 158 159 /* Look up for I2cSerialBus resource */ 160 INIT_LIST_HEAD(&resource_list); 161 ret = acpi_dev_get_resources(adev, &resource_list, 162 i2c_acpi_fill_info, lookup); 163 acpi_dev_free_resource_list(&resource_list); 164 165 if (ret < 0 || !info->addr) 166 return -EINVAL; 167 168 return 0; 169 } 170 171 static int i2c_acpi_add_resource(struct acpi_resource *ares, void *data) 172 { 173 int *irq = data; 174 struct resource r; 175 176 if (*irq <= 0 && acpi_dev_resource_interrupt(ares, 0, &r)) 177 *irq = i2c_dev_irq_from_resources(&r, 1); 178 179 return 1; /* No need to add resource to the list */ 180 } 181 182 /** 183 * i2c_acpi_get_irq - get device IRQ number from ACPI 184 * @client: Pointer to the I2C client device 185 * 186 * Find the IRQ number used by a specific client device. 187 * 188 * Return: The IRQ number or an error code. 189 */ 190 int i2c_acpi_get_irq(struct i2c_client *client) 191 { 192 struct acpi_device *adev = ACPI_COMPANION(&client->dev); 193 struct list_head resource_list; 194 int irq = -ENOENT; 195 int ret; 196 197 INIT_LIST_HEAD(&resource_list); 198 199 ret = acpi_dev_get_resources(adev, &resource_list, 200 i2c_acpi_add_resource, &irq); 201 if (ret < 0) 202 return ret; 203 204 acpi_dev_free_resource_list(&resource_list); 205 206 if (irq == -ENOENT) 207 irq = acpi_dev_gpio_irq_get(adev, 0); 208 209 return irq; 210 } 211 212 static int i2c_acpi_get_info(struct acpi_device *adev, 213 struct i2c_board_info *info, 214 struct i2c_adapter *adapter, 215 acpi_handle *adapter_handle) 216 { 217 struct i2c_acpi_lookup lookup; 218 int ret; 219 220 memset(&lookup, 0, sizeof(lookup)); 221 lookup.info = info; 222 lookup.index = -1; 223 224 if (acpi_device_enumerated(adev)) 225 return -EINVAL; 226 227 ret = i2c_acpi_do_lookup(adev, &lookup); 228 if (ret) 229 return ret; 230 231 if (adapter) { 232 /* The adapter must match the one in I2cSerialBus() connector */ 233 if (ACPI_HANDLE(&adapter->dev) != lookup.adapter_handle) 234 return -ENODEV; 235 } else { 236 struct acpi_device *adapter_adev; 237 238 /* The adapter must be present */ 239 adapter_adev = acpi_fetch_acpi_dev(lookup.adapter_handle); 240 if (!adapter_adev) 241 return -ENODEV; 242 if (acpi_bus_get_status(adapter_adev) || 243 !adapter_adev->status.present) 244 return -ENODEV; 245 } 246 247 info->fwnode = acpi_fwnode_handle(adev); 248 if (adapter_handle) 249 *adapter_handle = lookup.adapter_handle; 250 251 acpi_set_modalias(adev, dev_name(&adev->dev), info->type, 252 sizeof(info->type)); 253 254 return 0; 255 } 256 257 static void i2c_acpi_register_device(struct i2c_adapter *adapter, 258 struct acpi_device *adev, 259 struct i2c_board_info *info) 260 { 261 /* 262 * Skip registration on boards where the ACPI tables are 263 * known to contain bogus I2C devices. 264 */ 265 if (acpi_quirk_skip_i2c_client_enumeration(adev)) 266 return; 267 268 adev->power.flags.ignore_parent = true; 269 acpi_device_set_enumerated(adev); 270 271 if (IS_ERR(i2c_new_client_device(adapter, info))) 272 adev->power.flags.ignore_parent = false; 273 } 274 275 static acpi_status i2c_acpi_add_device(acpi_handle handle, u32 level, 276 void *data, void **return_value) 277 { 278 struct i2c_adapter *adapter = data; 279 struct acpi_device *adev = acpi_fetch_acpi_dev(handle); 280 struct i2c_board_info info; 281 282 if (!adev || i2c_acpi_get_info(adev, &info, adapter, NULL)) 283 return AE_OK; 284 285 i2c_acpi_register_device(adapter, adev, &info); 286 287 return AE_OK; 288 } 289 290 #define I2C_ACPI_MAX_SCAN_DEPTH 32 291 292 /** 293 * i2c_acpi_register_devices - enumerate I2C slave devices behind adapter 294 * @adap: pointer to adapter 295 * 296 * Enumerate all I2C slave devices behind this adapter by walking the ACPI 297 * namespace. When a device is found it will be added to the Linux device 298 * model and bound to the corresponding ACPI handle. 299 */ 300 void i2c_acpi_register_devices(struct i2c_adapter *adap) 301 { 302 struct acpi_device *adev; 303 acpi_status status; 304 305 if (!has_acpi_companion(&adap->dev)) 306 return; 307 308 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, 309 I2C_ACPI_MAX_SCAN_DEPTH, 310 i2c_acpi_add_device, NULL, 311 adap, NULL); 312 if (ACPI_FAILURE(status)) 313 dev_warn(&adap->dev, "failed to enumerate I2C slaves\n"); 314 315 if (!adap->dev.parent) 316 return; 317 318 adev = ACPI_COMPANION(adap->dev.parent); 319 if (!adev) 320 return; 321 322 acpi_dev_clear_dependencies(adev); 323 } 324 325 static const struct acpi_device_id i2c_acpi_force_400khz_device_ids[] = { 326 /* 327 * These Silead touchscreen controllers only work at 400KHz, for 328 * some reason they do not work at 100KHz. On some devices the ACPI 329 * tables list another device at their bus as only being capable 330 * of 100KHz, testing has shown that these other devices work fine 331 * at 400KHz (as can be expected of any recent i2c hw) so we force 332 * the speed of the bus to 400 KHz if a Silead device is present. 333 */ 334 { "MSSL1680", 0 }, 335 {} 336 }; 337 338 static acpi_status i2c_acpi_lookup_speed(acpi_handle handle, u32 level, 339 void *data, void **return_value) 340 { 341 struct i2c_acpi_lookup *lookup = data; 342 struct acpi_device *adev = acpi_fetch_acpi_dev(handle); 343 344 if (!adev || i2c_acpi_do_lookup(adev, lookup)) 345 return AE_OK; 346 347 if (lookup->search_handle != lookup->adapter_handle) 348 return AE_OK; 349 350 if (lookup->speed <= lookup->min_speed) 351 lookup->min_speed = lookup->speed; 352 353 if (acpi_match_device_ids(adev, i2c_acpi_force_400khz_device_ids) == 0) 354 lookup->force_speed = I2C_MAX_FAST_MODE_FREQ; 355 356 return AE_OK; 357 } 358 359 /** 360 * i2c_acpi_find_bus_speed - find I2C bus speed from ACPI 361 * @dev: The device owning the bus 362 * 363 * Find the I2C bus speed by walking the ACPI namespace for all I2C slaves 364 * devices connected to this bus and use the speed of slowest device. 365 * 366 * Returns the speed in Hz or zero 367 */ 368 u32 i2c_acpi_find_bus_speed(struct device *dev) 369 { 370 struct i2c_acpi_lookup lookup; 371 struct i2c_board_info dummy; 372 acpi_status status; 373 374 if (!has_acpi_companion(dev)) 375 return 0; 376 377 memset(&lookup, 0, sizeof(lookup)); 378 lookup.search_handle = ACPI_HANDLE(dev); 379 lookup.min_speed = UINT_MAX; 380 lookup.info = &dummy; 381 lookup.index = -1; 382 383 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, 384 I2C_ACPI_MAX_SCAN_DEPTH, 385 i2c_acpi_lookup_speed, NULL, 386 &lookup, NULL); 387 388 if (ACPI_FAILURE(status)) { 389 dev_warn(dev, "unable to find I2C bus speed from ACPI\n"); 390 return 0; 391 } 392 393 if (lookup.force_speed) { 394 if (lookup.force_speed != lookup.min_speed) 395 dev_warn(dev, FW_BUG "DSDT uses known not-working I2C bus speed %d, forcing it to %d\n", 396 lookup.min_speed, lookup.force_speed); 397 return lookup.force_speed; 398 } else if (lookup.min_speed != UINT_MAX) { 399 return lookup.min_speed; 400 } else { 401 return 0; 402 } 403 } 404 EXPORT_SYMBOL_GPL(i2c_acpi_find_bus_speed); 405 406 struct i2c_adapter *i2c_acpi_find_adapter_by_handle(acpi_handle handle) 407 { 408 struct i2c_adapter *adapter; 409 struct device *dev; 410 411 dev = bus_find_device(&i2c_bus_type, NULL, handle, device_match_acpi_handle); 412 if (!dev) 413 return NULL; 414 415 adapter = i2c_verify_adapter(dev); 416 if (!adapter) 417 put_device(dev); 418 419 return adapter; 420 } 421 EXPORT_SYMBOL_GPL(i2c_acpi_find_adapter_by_handle); 422 423 static struct i2c_client *i2c_acpi_find_client_by_adev(struct acpi_device *adev) 424 { 425 struct device *dev; 426 struct i2c_client *client; 427 428 dev = bus_find_device_by_acpi_dev(&i2c_bus_type, adev); 429 if (!dev) 430 return NULL; 431 432 client = i2c_verify_client(dev); 433 if (!client) 434 put_device(dev); 435 436 return client; 437 } 438 439 static int i2c_acpi_notify(struct notifier_block *nb, unsigned long value, 440 void *arg) 441 { 442 struct acpi_device *adev = arg; 443 struct i2c_board_info info; 444 acpi_handle adapter_handle; 445 struct i2c_adapter *adapter; 446 struct i2c_client *client; 447 448 switch (value) { 449 case ACPI_RECONFIG_DEVICE_ADD: 450 if (i2c_acpi_get_info(adev, &info, NULL, &adapter_handle)) 451 break; 452 453 adapter = i2c_acpi_find_adapter_by_handle(adapter_handle); 454 if (!adapter) 455 break; 456 457 i2c_acpi_register_device(adapter, adev, &info); 458 put_device(&adapter->dev); 459 break; 460 case ACPI_RECONFIG_DEVICE_REMOVE: 461 if (!acpi_device_enumerated(adev)) 462 break; 463 464 client = i2c_acpi_find_client_by_adev(adev); 465 if (!client) 466 break; 467 468 i2c_unregister_device(client); 469 put_device(&client->dev); 470 break; 471 } 472 473 return NOTIFY_OK; 474 } 475 476 struct notifier_block i2c_acpi_notifier = { 477 .notifier_call = i2c_acpi_notify, 478 }; 479 480 /** 481 * i2c_acpi_new_device_by_fwnode - Create i2c-client for the Nth I2cSerialBus resource 482 * @fwnode: fwnode with the ACPI resources to get the client from 483 * @index: Index of ACPI resource to get 484 * @info: describes the I2C device; note this is modified (addr gets set) 485 * Context: can sleep 486 * 487 * By default the i2c subsys creates an i2c-client for the first I2cSerialBus 488 * resource of an acpi_device, but some acpi_devices have multiple I2cSerialBus 489 * resources, in that case this function can be used to create an i2c-client 490 * for other I2cSerialBus resources in the Current Resource Settings table. 491 * 492 * Also see i2c_new_client_device, which this function calls to create the 493 * i2c-client. 494 * 495 * Returns a pointer to the new i2c-client, or error pointer in case of failure. 496 * Specifically, -EPROBE_DEFER is returned if the adapter is not found. 497 */ 498 struct i2c_client *i2c_acpi_new_device_by_fwnode(struct fwnode_handle *fwnode, 499 int index, 500 struct i2c_board_info *info) 501 { 502 struct i2c_acpi_lookup lookup; 503 struct i2c_adapter *adapter; 504 struct acpi_device *adev; 505 LIST_HEAD(resource_list); 506 int ret; 507 508 adev = to_acpi_device_node(fwnode); 509 if (!adev) 510 return ERR_PTR(-ENODEV); 511 512 memset(&lookup, 0, sizeof(lookup)); 513 lookup.info = info; 514 lookup.device_handle = acpi_device_handle(adev); 515 lookup.index = index; 516 517 ret = acpi_dev_get_resources(adev, &resource_list, 518 i2c_acpi_fill_info, &lookup); 519 if (ret < 0) 520 return ERR_PTR(ret); 521 522 acpi_dev_free_resource_list(&resource_list); 523 524 if (!info->addr) 525 return ERR_PTR(-EADDRNOTAVAIL); 526 527 adapter = i2c_acpi_find_adapter_by_handle(lookup.adapter_handle); 528 if (!adapter) 529 return ERR_PTR(-EPROBE_DEFER); 530 531 return i2c_new_client_device(adapter, info); 532 } 533 EXPORT_SYMBOL_GPL(i2c_acpi_new_device_by_fwnode); 534 535 bool i2c_acpi_waive_d0_probe(struct device *dev) 536 { 537 struct i2c_driver *driver = to_i2c_driver(dev->driver); 538 struct acpi_device *adev = ACPI_COMPANION(dev); 539 540 return driver->flags & I2C_DRV_ACPI_WAIVE_D0_PROBE && 541 adev && adev->power.state_for_enumeration >= adev->power.state; 542 } 543 EXPORT_SYMBOL_GPL(i2c_acpi_waive_d0_probe); 544 545 #ifdef CONFIG_ACPI_I2C_OPREGION 546 static int acpi_gsb_i2c_read_bytes(struct i2c_client *client, 547 u8 cmd, u8 *data, u8 data_len) 548 { 549 550 struct i2c_msg msgs[2]; 551 int ret; 552 u8 *buffer; 553 554 buffer = kzalloc(data_len, GFP_KERNEL); 555 if (!buffer) 556 return AE_NO_MEMORY; 557 558 msgs[0].addr = client->addr; 559 msgs[0].flags = client->flags; 560 msgs[0].len = 1; 561 msgs[0].buf = &cmd; 562 563 msgs[1].addr = client->addr; 564 msgs[1].flags = client->flags | I2C_M_RD; 565 msgs[1].len = data_len; 566 msgs[1].buf = buffer; 567 568 ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs)); 569 if (ret < 0) { 570 /* Getting a NACK is unfortunately normal with some DSTDs */ 571 if (ret == -EREMOTEIO) 572 dev_dbg(&client->adapter->dev, "i2c read %d bytes from client@%#x starting at reg %#x failed, error: %d\n", 573 data_len, client->addr, cmd, ret); 574 else 575 dev_err(&client->adapter->dev, "i2c read %d bytes from client@%#x starting at reg %#x failed, error: %d\n", 576 data_len, client->addr, cmd, ret); 577 /* 2 transfers must have completed successfully */ 578 } else if (ret == 2) { 579 memcpy(data, buffer, data_len); 580 ret = 0; 581 } else { 582 ret = -EIO; 583 } 584 585 kfree(buffer); 586 return ret; 587 } 588 589 static int acpi_gsb_i2c_write_bytes(struct i2c_client *client, 590 u8 cmd, u8 *data, u8 data_len) 591 { 592 593 struct i2c_msg msgs[1]; 594 u8 *buffer; 595 int ret = AE_OK; 596 597 buffer = kzalloc(data_len + 1, GFP_KERNEL); 598 if (!buffer) 599 return AE_NO_MEMORY; 600 601 buffer[0] = cmd; 602 memcpy(buffer + 1, data, data_len); 603 604 msgs[0].addr = client->addr; 605 msgs[0].flags = client->flags; 606 msgs[0].len = data_len + 1; 607 msgs[0].buf = buffer; 608 609 ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs)); 610 611 kfree(buffer); 612 613 if (ret < 0) { 614 dev_err(&client->adapter->dev, "i2c write failed: %d\n", ret); 615 return ret; 616 } 617 618 /* 1 transfer must have completed successfully */ 619 return (ret == 1) ? 0 : -EIO; 620 } 621 622 static acpi_status 623 i2c_acpi_space_handler(u32 function, acpi_physical_address command, 624 u32 bits, u64 *value64, 625 void *handler_context, void *region_context) 626 { 627 struct gsb_buffer *gsb = (struct gsb_buffer *)value64; 628 struct i2c_acpi_handler_data *data = handler_context; 629 struct acpi_connection_info *info = &data->info; 630 struct acpi_resource_i2c_serialbus *sb; 631 struct i2c_adapter *adapter = data->adapter; 632 struct i2c_client *client; 633 struct acpi_resource *ares; 634 u32 accessor_type = function >> 16; 635 u8 action = function & ACPI_IO_MASK; 636 acpi_status ret; 637 int status; 638 639 ret = acpi_buffer_to_resource(info->connection, info->length, &ares); 640 if (ACPI_FAILURE(ret)) 641 return ret; 642 643 client = kzalloc(sizeof(*client), GFP_KERNEL); 644 if (!client) { 645 ret = AE_NO_MEMORY; 646 goto err; 647 } 648 649 if (!value64 || !i2c_acpi_get_i2c_resource(ares, &sb)) { 650 ret = AE_BAD_PARAMETER; 651 goto err; 652 } 653 654 client->adapter = adapter; 655 client->addr = sb->slave_address; 656 657 if (sb->access_mode == ACPI_I2C_10BIT_MODE) 658 client->flags |= I2C_CLIENT_TEN; 659 660 switch (accessor_type) { 661 case ACPI_GSB_ACCESS_ATTRIB_SEND_RCV: 662 if (action == ACPI_READ) { 663 status = i2c_smbus_read_byte(client); 664 if (status >= 0) { 665 gsb->bdata = status; 666 status = 0; 667 } 668 } else { 669 status = i2c_smbus_write_byte(client, gsb->bdata); 670 } 671 break; 672 673 case ACPI_GSB_ACCESS_ATTRIB_BYTE: 674 if (action == ACPI_READ) { 675 status = i2c_smbus_read_byte_data(client, command); 676 if (status >= 0) { 677 gsb->bdata = status; 678 status = 0; 679 } 680 } else { 681 status = i2c_smbus_write_byte_data(client, command, 682 gsb->bdata); 683 } 684 break; 685 686 case ACPI_GSB_ACCESS_ATTRIB_WORD: 687 if (action == ACPI_READ) { 688 status = i2c_smbus_read_word_data(client, command); 689 if (status >= 0) { 690 gsb->wdata = status; 691 status = 0; 692 } 693 } else { 694 status = i2c_smbus_write_word_data(client, command, 695 gsb->wdata); 696 } 697 break; 698 699 case ACPI_GSB_ACCESS_ATTRIB_BLOCK: 700 if (action == ACPI_READ) { 701 status = i2c_smbus_read_block_data(client, command, 702 gsb->data); 703 if (status >= 0) { 704 gsb->len = status; 705 status = 0; 706 } 707 } else { 708 status = i2c_smbus_write_block_data(client, command, 709 gsb->len, gsb->data); 710 } 711 break; 712 713 case ACPI_GSB_ACCESS_ATTRIB_MULTIBYTE: 714 if (action == ACPI_READ) { 715 status = acpi_gsb_i2c_read_bytes(client, command, 716 gsb->data, info->access_length); 717 } else { 718 status = acpi_gsb_i2c_write_bytes(client, command, 719 gsb->data, info->access_length); 720 } 721 break; 722 723 default: 724 dev_warn(&adapter->dev, "protocol 0x%02x not supported for client 0x%02x\n", 725 accessor_type, client->addr); 726 ret = AE_BAD_PARAMETER; 727 goto err; 728 } 729 730 gsb->status = status; 731 732 err: 733 kfree(client); 734 ACPI_FREE(ares); 735 return ret; 736 } 737 738 739 int i2c_acpi_install_space_handler(struct i2c_adapter *adapter) 740 { 741 acpi_handle handle; 742 struct i2c_acpi_handler_data *data; 743 acpi_status status; 744 745 if (!adapter->dev.parent) 746 return -ENODEV; 747 748 handle = ACPI_HANDLE(adapter->dev.parent); 749 750 if (!handle) 751 return -ENODEV; 752 753 data = kzalloc(sizeof(struct i2c_acpi_handler_data), 754 GFP_KERNEL); 755 if (!data) 756 return -ENOMEM; 757 758 data->adapter = adapter; 759 status = acpi_bus_attach_private_data(handle, (void *)data); 760 if (ACPI_FAILURE(status)) { 761 kfree(data); 762 return -ENOMEM; 763 } 764 765 status = acpi_install_address_space_handler(handle, 766 ACPI_ADR_SPACE_GSBUS, 767 &i2c_acpi_space_handler, 768 NULL, 769 data); 770 if (ACPI_FAILURE(status)) { 771 dev_err(&adapter->dev, "Error installing i2c space handler\n"); 772 acpi_bus_detach_private_data(handle); 773 kfree(data); 774 return -ENOMEM; 775 } 776 777 return 0; 778 } 779 780 void i2c_acpi_remove_space_handler(struct i2c_adapter *adapter) 781 { 782 acpi_handle handle; 783 struct i2c_acpi_handler_data *data; 784 acpi_status status; 785 786 if (!adapter->dev.parent) 787 return; 788 789 handle = ACPI_HANDLE(adapter->dev.parent); 790 791 if (!handle) 792 return; 793 794 acpi_remove_address_space_handler(handle, 795 ACPI_ADR_SPACE_GSBUS, 796 &i2c_acpi_space_handler); 797 798 status = acpi_bus_get_private_data(handle, (void **)&data); 799 if (ACPI_SUCCESS(status)) 800 kfree(data); 801 802 acpi_bus_detach_private_data(handle); 803 } 804 #endif /* CONFIG_ACPI_I2C_OPREGION */ 805