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 if (acpi_bus_get_device(lookup.adapter_handle, &adapter_adev)) 240 return -ENODEV; 241 if (acpi_bus_get_status(adapter_adev) || 242 !adapter_adev->status.present) 243 return -ENODEV; 244 } 245 246 info->fwnode = acpi_fwnode_handle(adev); 247 if (adapter_handle) 248 *adapter_handle = lookup.adapter_handle; 249 250 acpi_set_modalias(adev, dev_name(&adev->dev), info->type, 251 sizeof(info->type)); 252 253 return 0; 254 } 255 256 static void i2c_acpi_register_device(struct i2c_adapter *adapter, 257 struct acpi_device *adev, 258 struct i2c_board_info *info) 259 { 260 /* 261 * Skip registration on boards where the ACPI tables are 262 * known to contain bogus I2C devices. 263 */ 264 if (acpi_quirk_skip_i2c_client_enumeration(adev)) 265 return; 266 267 adev->power.flags.ignore_parent = true; 268 acpi_device_set_enumerated(adev); 269 270 if (IS_ERR(i2c_new_client_device(adapter, info))) 271 adev->power.flags.ignore_parent = false; 272 } 273 274 static acpi_status i2c_acpi_add_device(acpi_handle handle, u32 level, 275 void *data, void **return_value) 276 { 277 struct i2c_adapter *adapter = data; 278 struct acpi_device *adev; 279 struct i2c_board_info info; 280 281 if (acpi_bus_get_device(handle, &adev)) 282 return AE_OK; 283 284 if (i2c_acpi_get_info(adev, &info, adapter, NULL)) 285 return AE_OK; 286 287 i2c_acpi_register_device(adapter, adev, &info); 288 289 return AE_OK; 290 } 291 292 #define I2C_ACPI_MAX_SCAN_DEPTH 32 293 294 /** 295 * i2c_acpi_register_devices - enumerate I2C slave devices behind adapter 296 * @adap: pointer to adapter 297 * 298 * Enumerate all I2C slave devices behind this adapter by walking the ACPI 299 * namespace. When a device is found it will be added to the Linux device 300 * model and bound to the corresponding ACPI handle. 301 */ 302 void i2c_acpi_register_devices(struct i2c_adapter *adap) 303 { 304 struct acpi_device *adev; 305 acpi_status status; 306 307 if (!has_acpi_companion(&adap->dev)) 308 return; 309 310 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, 311 I2C_ACPI_MAX_SCAN_DEPTH, 312 i2c_acpi_add_device, NULL, 313 adap, NULL); 314 if (ACPI_FAILURE(status)) 315 dev_warn(&adap->dev, "failed to enumerate I2C slaves\n"); 316 317 if (!adap->dev.parent) 318 return; 319 320 adev = ACPI_COMPANION(adap->dev.parent); 321 if (!adev) 322 return; 323 324 acpi_dev_clear_dependencies(adev); 325 } 326 327 static const struct acpi_device_id i2c_acpi_force_400khz_device_ids[] = { 328 /* 329 * These Silead touchscreen controllers only work at 400KHz, for 330 * some reason they do not work at 100KHz. On some devices the ACPI 331 * tables list another device at their bus as only being capable 332 * of 100KHz, testing has shown that these other devices work fine 333 * at 400KHz (as can be expected of any recent i2c hw) so we force 334 * the speed of the bus to 400 KHz if a Silead device is present. 335 */ 336 { "MSSL1680", 0 }, 337 {} 338 }; 339 340 static acpi_status i2c_acpi_lookup_speed(acpi_handle handle, u32 level, 341 void *data, void **return_value) 342 { 343 struct i2c_acpi_lookup *lookup = data; 344 struct acpi_device *adev; 345 346 if (acpi_bus_get_device(handle, &adev)) 347 return AE_OK; 348 349 if (i2c_acpi_do_lookup(adev, lookup)) 350 return AE_OK; 351 352 if (lookup->search_handle != lookup->adapter_handle) 353 return AE_OK; 354 355 if (lookup->speed <= lookup->min_speed) 356 lookup->min_speed = lookup->speed; 357 358 if (acpi_match_device_ids(adev, i2c_acpi_force_400khz_device_ids) == 0) 359 lookup->force_speed = I2C_MAX_FAST_MODE_FREQ; 360 361 return AE_OK; 362 } 363 364 /** 365 * i2c_acpi_find_bus_speed - find I2C bus speed from ACPI 366 * @dev: The device owning the bus 367 * 368 * Find the I2C bus speed by walking the ACPI namespace for all I2C slaves 369 * devices connected to this bus and use the speed of slowest device. 370 * 371 * Returns the speed in Hz or zero 372 */ 373 u32 i2c_acpi_find_bus_speed(struct device *dev) 374 { 375 struct i2c_acpi_lookup lookup; 376 struct i2c_board_info dummy; 377 acpi_status status; 378 379 if (!has_acpi_companion(dev)) 380 return 0; 381 382 memset(&lookup, 0, sizeof(lookup)); 383 lookup.search_handle = ACPI_HANDLE(dev); 384 lookup.min_speed = UINT_MAX; 385 lookup.info = &dummy; 386 lookup.index = -1; 387 388 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, 389 I2C_ACPI_MAX_SCAN_DEPTH, 390 i2c_acpi_lookup_speed, NULL, 391 &lookup, NULL); 392 393 if (ACPI_FAILURE(status)) { 394 dev_warn(dev, "unable to find I2C bus speed from ACPI\n"); 395 return 0; 396 } 397 398 if (lookup.force_speed) { 399 if (lookup.force_speed != lookup.min_speed) 400 dev_warn(dev, FW_BUG "DSDT uses known not-working I2C bus speed %d, forcing it to %d\n", 401 lookup.min_speed, lookup.force_speed); 402 return lookup.force_speed; 403 } else if (lookup.min_speed != UINT_MAX) { 404 return lookup.min_speed; 405 } else { 406 return 0; 407 } 408 } 409 EXPORT_SYMBOL_GPL(i2c_acpi_find_bus_speed); 410 411 struct i2c_adapter *i2c_acpi_find_adapter_by_handle(acpi_handle handle) 412 { 413 struct i2c_adapter *adapter; 414 struct device *dev; 415 416 dev = bus_find_device(&i2c_bus_type, NULL, handle, device_match_acpi_handle); 417 if (!dev) 418 return NULL; 419 420 adapter = i2c_verify_adapter(dev); 421 if (!adapter) 422 put_device(dev); 423 424 return adapter; 425 } 426 EXPORT_SYMBOL_GPL(i2c_acpi_find_adapter_by_handle); 427 428 static struct i2c_client *i2c_acpi_find_client_by_adev(struct acpi_device *adev) 429 { 430 struct device *dev; 431 struct i2c_client *client; 432 433 dev = bus_find_device_by_acpi_dev(&i2c_bus_type, adev); 434 if (!dev) 435 return NULL; 436 437 client = i2c_verify_client(dev); 438 if (!client) 439 put_device(dev); 440 441 return client; 442 } 443 444 static int i2c_acpi_notify(struct notifier_block *nb, unsigned long value, 445 void *arg) 446 { 447 struct acpi_device *adev = arg; 448 struct i2c_board_info info; 449 acpi_handle adapter_handle; 450 struct i2c_adapter *adapter; 451 struct i2c_client *client; 452 453 switch (value) { 454 case ACPI_RECONFIG_DEVICE_ADD: 455 if (i2c_acpi_get_info(adev, &info, NULL, &adapter_handle)) 456 break; 457 458 adapter = i2c_acpi_find_adapter_by_handle(adapter_handle); 459 if (!adapter) 460 break; 461 462 i2c_acpi_register_device(adapter, adev, &info); 463 put_device(&adapter->dev); 464 break; 465 case ACPI_RECONFIG_DEVICE_REMOVE: 466 if (!acpi_device_enumerated(adev)) 467 break; 468 469 client = i2c_acpi_find_client_by_adev(adev); 470 if (!client) 471 break; 472 473 i2c_unregister_device(client); 474 put_device(&client->dev); 475 break; 476 } 477 478 return NOTIFY_OK; 479 } 480 481 struct notifier_block i2c_acpi_notifier = { 482 .notifier_call = i2c_acpi_notify, 483 }; 484 485 /** 486 * i2c_acpi_new_device_by_fwnode - Create i2c-client for the Nth I2cSerialBus resource 487 * @fwnode: fwnode with the ACPI resources to get the client from 488 * @index: Index of ACPI resource to get 489 * @info: describes the I2C device; note this is modified (addr gets set) 490 * Context: can sleep 491 * 492 * By default the i2c subsys creates an i2c-client for the first I2cSerialBus 493 * resource of an acpi_device, but some acpi_devices have multiple I2cSerialBus 494 * resources, in that case this function can be used to create an i2c-client 495 * for other I2cSerialBus resources in the Current Resource Settings table. 496 * 497 * Also see i2c_new_client_device, which this function calls to create the 498 * i2c-client. 499 * 500 * Returns a pointer to the new i2c-client, or error pointer in case of failure. 501 * Specifically, -EPROBE_DEFER is returned if the adapter is not found. 502 */ 503 struct i2c_client *i2c_acpi_new_device_by_fwnode(struct fwnode_handle *fwnode, 504 int index, 505 struct i2c_board_info *info) 506 { 507 struct i2c_acpi_lookup lookup; 508 struct i2c_adapter *adapter; 509 struct acpi_device *adev; 510 LIST_HEAD(resource_list); 511 int ret; 512 513 adev = to_acpi_device_node(fwnode); 514 if (!adev) 515 return ERR_PTR(-ENODEV); 516 517 memset(&lookup, 0, sizeof(lookup)); 518 lookup.info = info; 519 lookup.device_handle = acpi_device_handle(adev); 520 lookup.index = index; 521 522 ret = acpi_dev_get_resources(adev, &resource_list, 523 i2c_acpi_fill_info, &lookup); 524 if (ret < 0) 525 return ERR_PTR(ret); 526 527 acpi_dev_free_resource_list(&resource_list); 528 529 if (!info->addr) 530 return ERR_PTR(-EADDRNOTAVAIL); 531 532 adapter = i2c_acpi_find_adapter_by_handle(lookup.adapter_handle); 533 if (!adapter) 534 return ERR_PTR(-EPROBE_DEFER); 535 536 return i2c_new_client_device(adapter, info); 537 } 538 EXPORT_SYMBOL_GPL(i2c_acpi_new_device_by_fwnode); 539 540 bool i2c_acpi_waive_d0_probe(struct device *dev) 541 { 542 struct i2c_driver *driver = to_i2c_driver(dev->driver); 543 struct acpi_device *adev = ACPI_COMPANION(dev); 544 545 return driver->flags & I2C_DRV_ACPI_WAIVE_D0_PROBE && 546 adev && adev->power.state_for_enumeration >= adev->power.state; 547 } 548 EXPORT_SYMBOL_GPL(i2c_acpi_waive_d0_probe); 549 550 #ifdef CONFIG_ACPI_I2C_OPREGION 551 static int acpi_gsb_i2c_read_bytes(struct i2c_client *client, 552 u8 cmd, u8 *data, u8 data_len) 553 { 554 555 struct i2c_msg msgs[2]; 556 int ret; 557 u8 *buffer; 558 559 buffer = kzalloc(data_len, GFP_KERNEL); 560 if (!buffer) 561 return AE_NO_MEMORY; 562 563 msgs[0].addr = client->addr; 564 msgs[0].flags = client->flags; 565 msgs[0].len = 1; 566 msgs[0].buf = &cmd; 567 568 msgs[1].addr = client->addr; 569 msgs[1].flags = client->flags | I2C_M_RD; 570 msgs[1].len = data_len; 571 msgs[1].buf = buffer; 572 573 ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs)); 574 if (ret < 0) { 575 /* Getting a NACK is unfortunately normal with some DSTDs */ 576 if (ret == -EREMOTEIO) 577 dev_dbg(&client->adapter->dev, "i2c read %d bytes from client@%#x starting at reg %#x failed, error: %d\n", 578 data_len, client->addr, cmd, ret); 579 else 580 dev_err(&client->adapter->dev, "i2c read %d bytes from client@%#x starting at reg %#x failed, error: %d\n", 581 data_len, client->addr, cmd, ret); 582 /* 2 transfers must have completed successfully */ 583 } else if (ret == 2) { 584 memcpy(data, buffer, data_len); 585 ret = 0; 586 } else { 587 ret = -EIO; 588 } 589 590 kfree(buffer); 591 return ret; 592 } 593 594 static int acpi_gsb_i2c_write_bytes(struct i2c_client *client, 595 u8 cmd, u8 *data, u8 data_len) 596 { 597 598 struct i2c_msg msgs[1]; 599 u8 *buffer; 600 int ret = AE_OK; 601 602 buffer = kzalloc(data_len + 1, GFP_KERNEL); 603 if (!buffer) 604 return AE_NO_MEMORY; 605 606 buffer[0] = cmd; 607 memcpy(buffer + 1, data, data_len); 608 609 msgs[0].addr = client->addr; 610 msgs[0].flags = client->flags; 611 msgs[0].len = data_len + 1; 612 msgs[0].buf = buffer; 613 614 ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs)); 615 616 kfree(buffer); 617 618 if (ret < 0) { 619 dev_err(&client->adapter->dev, "i2c write failed: %d\n", ret); 620 return ret; 621 } 622 623 /* 1 transfer must have completed successfully */ 624 return (ret == 1) ? 0 : -EIO; 625 } 626 627 static acpi_status 628 i2c_acpi_space_handler(u32 function, acpi_physical_address command, 629 u32 bits, u64 *value64, 630 void *handler_context, void *region_context) 631 { 632 struct gsb_buffer *gsb = (struct gsb_buffer *)value64; 633 struct i2c_acpi_handler_data *data = handler_context; 634 struct acpi_connection_info *info = &data->info; 635 struct acpi_resource_i2c_serialbus *sb; 636 struct i2c_adapter *adapter = data->adapter; 637 struct i2c_client *client; 638 struct acpi_resource *ares; 639 u32 accessor_type = function >> 16; 640 u8 action = function & ACPI_IO_MASK; 641 acpi_status ret; 642 int status; 643 644 ret = acpi_buffer_to_resource(info->connection, info->length, &ares); 645 if (ACPI_FAILURE(ret)) 646 return ret; 647 648 client = kzalloc(sizeof(*client), GFP_KERNEL); 649 if (!client) { 650 ret = AE_NO_MEMORY; 651 goto err; 652 } 653 654 if (!value64 || !i2c_acpi_get_i2c_resource(ares, &sb)) { 655 ret = AE_BAD_PARAMETER; 656 goto err; 657 } 658 659 client->adapter = adapter; 660 client->addr = sb->slave_address; 661 662 if (sb->access_mode == ACPI_I2C_10BIT_MODE) 663 client->flags |= I2C_CLIENT_TEN; 664 665 switch (accessor_type) { 666 case ACPI_GSB_ACCESS_ATTRIB_SEND_RCV: 667 if (action == ACPI_READ) { 668 status = i2c_smbus_read_byte(client); 669 if (status >= 0) { 670 gsb->bdata = status; 671 status = 0; 672 } 673 } else { 674 status = i2c_smbus_write_byte(client, gsb->bdata); 675 } 676 break; 677 678 case ACPI_GSB_ACCESS_ATTRIB_BYTE: 679 if (action == ACPI_READ) { 680 status = i2c_smbus_read_byte_data(client, command); 681 if (status >= 0) { 682 gsb->bdata = status; 683 status = 0; 684 } 685 } else { 686 status = i2c_smbus_write_byte_data(client, command, 687 gsb->bdata); 688 } 689 break; 690 691 case ACPI_GSB_ACCESS_ATTRIB_WORD: 692 if (action == ACPI_READ) { 693 status = i2c_smbus_read_word_data(client, command); 694 if (status >= 0) { 695 gsb->wdata = status; 696 status = 0; 697 } 698 } else { 699 status = i2c_smbus_write_word_data(client, command, 700 gsb->wdata); 701 } 702 break; 703 704 case ACPI_GSB_ACCESS_ATTRIB_BLOCK: 705 if (action == ACPI_READ) { 706 status = i2c_smbus_read_block_data(client, command, 707 gsb->data); 708 if (status >= 0) { 709 gsb->len = status; 710 status = 0; 711 } 712 } else { 713 status = i2c_smbus_write_block_data(client, command, 714 gsb->len, gsb->data); 715 } 716 break; 717 718 case ACPI_GSB_ACCESS_ATTRIB_MULTIBYTE: 719 if (action == ACPI_READ) { 720 status = acpi_gsb_i2c_read_bytes(client, command, 721 gsb->data, info->access_length); 722 } else { 723 status = acpi_gsb_i2c_write_bytes(client, command, 724 gsb->data, info->access_length); 725 } 726 break; 727 728 default: 729 dev_warn(&adapter->dev, "protocol 0x%02x not supported for client 0x%02x\n", 730 accessor_type, client->addr); 731 ret = AE_BAD_PARAMETER; 732 goto err; 733 } 734 735 gsb->status = status; 736 737 err: 738 kfree(client); 739 ACPI_FREE(ares); 740 return ret; 741 } 742 743 744 int i2c_acpi_install_space_handler(struct i2c_adapter *adapter) 745 { 746 acpi_handle handle; 747 struct i2c_acpi_handler_data *data; 748 acpi_status status; 749 750 if (!adapter->dev.parent) 751 return -ENODEV; 752 753 handle = ACPI_HANDLE(adapter->dev.parent); 754 755 if (!handle) 756 return -ENODEV; 757 758 data = kzalloc(sizeof(struct i2c_acpi_handler_data), 759 GFP_KERNEL); 760 if (!data) 761 return -ENOMEM; 762 763 data->adapter = adapter; 764 status = acpi_bus_attach_private_data(handle, (void *)data); 765 if (ACPI_FAILURE(status)) { 766 kfree(data); 767 return -ENOMEM; 768 } 769 770 status = acpi_install_address_space_handler(handle, 771 ACPI_ADR_SPACE_GSBUS, 772 &i2c_acpi_space_handler, 773 NULL, 774 data); 775 if (ACPI_FAILURE(status)) { 776 dev_err(&adapter->dev, "Error installing i2c space handler\n"); 777 acpi_bus_detach_private_data(handle); 778 kfree(data); 779 return -ENOMEM; 780 } 781 782 return 0; 783 } 784 785 void i2c_acpi_remove_space_handler(struct i2c_adapter *adapter) 786 { 787 acpi_handle handle; 788 struct i2c_acpi_handler_data *data; 789 acpi_status status; 790 791 if (!adapter->dev.parent) 792 return; 793 794 handle = ACPI_HANDLE(adapter->dev.parent); 795 796 if (!handle) 797 return; 798 799 acpi_remove_address_space_handler(handle, 800 ACPI_ADR_SPACE_GSBUS, 801 &i2c_acpi_space_handler); 802 803 status = acpi_bus_get_private_data(handle, (void **)&data); 804 if (ACPI_SUCCESS(status)) 805 kfree(data); 806 807 acpi_bus_detach_private_data(handle); 808 } 809 #endif /* CONFIG_ACPI_I2C_OPREGION */ 810