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 DECLARE_FLEX_ARRAY(u8, data); 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 struct i2c_acpi_irq_context { 141 int irq; 142 bool wake_capable; 143 }; 144 145 static int i2c_acpi_do_lookup(struct acpi_device *adev, 146 struct i2c_acpi_lookup *lookup) 147 { 148 struct i2c_board_info *info = lookup->info; 149 struct list_head resource_list; 150 int ret; 151 152 if (acpi_bus_get_status(adev)) 153 return -EINVAL; 154 155 if (!acpi_dev_ready_for_enumeration(adev)) 156 return -ENODEV; 157 158 if (acpi_match_device_ids(adev, i2c_acpi_ignored_device_ids) == 0) 159 return -ENODEV; 160 161 memset(info, 0, sizeof(*info)); 162 lookup->device_handle = acpi_device_handle(adev); 163 164 /* Look up for I2cSerialBus resource */ 165 INIT_LIST_HEAD(&resource_list); 166 ret = acpi_dev_get_resources(adev, &resource_list, 167 i2c_acpi_fill_info, lookup); 168 acpi_dev_free_resource_list(&resource_list); 169 170 if (ret < 0 || !info->addr) 171 return -EINVAL; 172 173 return 0; 174 } 175 176 static int i2c_acpi_add_irq_resource(struct acpi_resource *ares, void *data) 177 { 178 struct i2c_acpi_irq_context *irq_ctx = data; 179 struct resource r; 180 181 if (irq_ctx->irq > 0) 182 return 1; 183 184 if (!acpi_dev_resource_interrupt(ares, 0, &r)) 185 return 1; 186 187 irq_ctx->irq = i2c_dev_irq_from_resources(&r, 1); 188 irq_ctx->wake_capable = r.flags & IORESOURCE_IRQ_WAKECAPABLE; 189 190 return 1; /* No need to add resource to the list */ 191 } 192 193 /** 194 * i2c_acpi_get_irq - get device IRQ number from ACPI 195 * @client: Pointer to the I2C client device 196 * @wake_capable: Set to true if the IRQ is wake capable 197 * 198 * Find the IRQ number used by a specific client device. 199 * 200 * Return: The IRQ number or an error code. 201 */ 202 int i2c_acpi_get_irq(struct i2c_client *client, bool *wake_capable) 203 { 204 struct acpi_device *adev = ACPI_COMPANION(&client->dev); 205 struct list_head resource_list; 206 struct i2c_acpi_irq_context irq_ctx = { 207 .irq = -ENOENT, 208 }; 209 int ret; 210 211 INIT_LIST_HEAD(&resource_list); 212 213 ret = acpi_dev_get_resources(adev, &resource_list, 214 i2c_acpi_add_irq_resource, &irq_ctx); 215 if (ret < 0) 216 return ret; 217 218 acpi_dev_free_resource_list(&resource_list); 219 220 if (irq_ctx.irq == -ENOENT) 221 irq_ctx.irq = acpi_dev_gpio_irq_wake_get(adev, 0, &irq_ctx.wake_capable); 222 223 if (irq_ctx.irq < 0) 224 return irq_ctx.irq; 225 226 if (wake_capable) 227 *wake_capable = irq_ctx.wake_capable; 228 229 return irq_ctx.irq; 230 } 231 232 static int i2c_acpi_get_info(struct acpi_device *adev, 233 struct i2c_board_info *info, 234 struct i2c_adapter *adapter, 235 acpi_handle *adapter_handle) 236 { 237 struct i2c_acpi_lookup lookup; 238 int ret; 239 240 memset(&lookup, 0, sizeof(lookup)); 241 lookup.info = info; 242 lookup.index = -1; 243 244 if (acpi_device_enumerated(adev)) 245 return -EINVAL; 246 247 ret = i2c_acpi_do_lookup(adev, &lookup); 248 if (ret) 249 return ret; 250 251 if (adapter) { 252 /* The adapter must match the one in I2cSerialBus() connector */ 253 if (ACPI_HANDLE(&adapter->dev) != lookup.adapter_handle) 254 return -ENODEV; 255 } else { 256 struct acpi_device *adapter_adev; 257 258 /* The adapter must be present */ 259 adapter_adev = acpi_fetch_acpi_dev(lookup.adapter_handle); 260 if (!adapter_adev) 261 return -ENODEV; 262 if (acpi_bus_get_status(adapter_adev) || 263 !adapter_adev->status.present) 264 return -ENODEV; 265 } 266 267 info->fwnode = acpi_fwnode_handle(adev); 268 if (adapter_handle) 269 *adapter_handle = lookup.adapter_handle; 270 271 acpi_set_modalias(adev, dev_name(&adev->dev), info->type, 272 sizeof(info->type)); 273 274 return 0; 275 } 276 277 static void i2c_acpi_register_device(struct i2c_adapter *adapter, 278 struct acpi_device *adev, 279 struct i2c_board_info *info) 280 { 281 /* 282 * Skip registration on boards where the ACPI tables are 283 * known to contain bogus I2C devices. 284 */ 285 if (acpi_quirk_skip_i2c_client_enumeration(adev)) 286 return; 287 288 adev->power.flags.ignore_parent = true; 289 acpi_device_set_enumerated(adev); 290 291 if (IS_ERR(i2c_new_client_device(adapter, info))) 292 adev->power.flags.ignore_parent = false; 293 } 294 295 static acpi_status i2c_acpi_add_device(acpi_handle handle, u32 level, 296 void *data, void **return_value) 297 { 298 struct i2c_adapter *adapter = data; 299 struct acpi_device *adev = acpi_fetch_acpi_dev(handle); 300 struct i2c_board_info info; 301 302 if (!adev || i2c_acpi_get_info(adev, &info, adapter, NULL)) 303 return AE_OK; 304 305 i2c_acpi_register_device(adapter, adev, &info); 306 307 return AE_OK; 308 } 309 310 #define I2C_ACPI_MAX_SCAN_DEPTH 32 311 312 /** 313 * i2c_acpi_register_devices - enumerate I2C slave devices behind adapter 314 * @adap: pointer to adapter 315 * 316 * Enumerate all I2C slave devices behind this adapter by walking the ACPI 317 * namespace. When a device is found it will be added to the Linux device 318 * model and bound to the corresponding ACPI handle. 319 */ 320 void i2c_acpi_register_devices(struct i2c_adapter *adap) 321 { 322 struct acpi_device *adev; 323 acpi_status status; 324 325 if (!has_acpi_companion(&adap->dev)) 326 return; 327 328 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, 329 I2C_ACPI_MAX_SCAN_DEPTH, 330 i2c_acpi_add_device, NULL, 331 adap, NULL); 332 if (ACPI_FAILURE(status)) 333 dev_warn(&adap->dev, "failed to enumerate I2C slaves\n"); 334 335 if (!adap->dev.parent) 336 return; 337 338 adev = ACPI_COMPANION(adap->dev.parent); 339 if (!adev) 340 return; 341 342 acpi_dev_clear_dependencies(adev); 343 } 344 345 static const struct acpi_device_id i2c_acpi_force_400khz_device_ids[] = { 346 /* 347 * These Silead touchscreen controllers only work at 400KHz, for 348 * some reason they do not work at 100KHz. On some devices the ACPI 349 * tables list another device at their bus as only being capable 350 * of 100KHz, testing has shown that these other devices work fine 351 * at 400KHz (as can be expected of any recent i2c hw) so we force 352 * the speed of the bus to 400 KHz if a Silead device is present. 353 */ 354 { "MSSL1680", 0 }, 355 {} 356 }; 357 358 static acpi_status i2c_acpi_lookup_speed(acpi_handle handle, u32 level, 359 void *data, void **return_value) 360 { 361 struct i2c_acpi_lookup *lookup = data; 362 struct acpi_device *adev = acpi_fetch_acpi_dev(handle); 363 364 if (!adev || i2c_acpi_do_lookup(adev, lookup)) 365 return AE_OK; 366 367 if (lookup->search_handle != lookup->adapter_handle) 368 return AE_OK; 369 370 if (lookup->speed <= lookup->min_speed) 371 lookup->min_speed = lookup->speed; 372 373 if (acpi_match_device_ids(adev, i2c_acpi_force_400khz_device_ids) == 0) 374 lookup->force_speed = I2C_MAX_FAST_MODE_FREQ; 375 376 return AE_OK; 377 } 378 379 /** 380 * i2c_acpi_find_bus_speed - find I2C bus speed from ACPI 381 * @dev: The device owning the bus 382 * 383 * Find the I2C bus speed by walking the ACPI namespace for all I2C slaves 384 * devices connected to this bus and use the speed of slowest device. 385 * 386 * Returns the speed in Hz or zero 387 */ 388 u32 i2c_acpi_find_bus_speed(struct device *dev) 389 { 390 struct i2c_acpi_lookup lookup; 391 struct i2c_board_info dummy; 392 acpi_status status; 393 394 if (!has_acpi_companion(dev)) 395 return 0; 396 397 memset(&lookup, 0, sizeof(lookup)); 398 lookup.search_handle = ACPI_HANDLE(dev); 399 lookup.min_speed = UINT_MAX; 400 lookup.info = &dummy; 401 lookup.index = -1; 402 403 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, 404 I2C_ACPI_MAX_SCAN_DEPTH, 405 i2c_acpi_lookup_speed, NULL, 406 &lookup, NULL); 407 408 if (ACPI_FAILURE(status)) { 409 dev_warn(dev, "unable to find I2C bus speed from ACPI\n"); 410 return 0; 411 } 412 413 if (lookup.force_speed) { 414 if (lookup.force_speed != lookup.min_speed) 415 dev_warn(dev, FW_BUG "DSDT uses known not-working I2C bus speed %d, forcing it to %d\n", 416 lookup.min_speed, lookup.force_speed); 417 return lookup.force_speed; 418 } else if (lookup.min_speed != UINT_MAX) { 419 return lookup.min_speed; 420 } else { 421 return 0; 422 } 423 } 424 EXPORT_SYMBOL_GPL(i2c_acpi_find_bus_speed); 425 426 struct i2c_adapter *i2c_acpi_find_adapter_by_handle(acpi_handle handle) 427 { 428 struct i2c_adapter *adapter; 429 struct device *dev; 430 431 dev = bus_find_device(&i2c_bus_type, NULL, handle, device_match_acpi_handle); 432 if (!dev) 433 return NULL; 434 435 adapter = i2c_verify_adapter(dev); 436 if (!adapter) 437 put_device(dev); 438 439 return adapter; 440 } 441 EXPORT_SYMBOL_GPL(i2c_acpi_find_adapter_by_handle); 442 443 static struct i2c_client *i2c_acpi_find_client_by_adev(struct acpi_device *adev) 444 { 445 return i2c_find_device_by_fwnode(acpi_fwnode_handle(adev)); 446 } 447 448 static int i2c_acpi_notify(struct notifier_block *nb, unsigned long value, 449 void *arg) 450 { 451 struct acpi_device *adev = arg; 452 struct i2c_board_info info; 453 acpi_handle adapter_handle; 454 struct i2c_adapter *adapter; 455 struct i2c_client *client; 456 457 switch (value) { 458 case ACPI_RECONFIG_DEVICE_ADD: 459 if (i2c_acpi_get_info(adev, &info, NULL, &adapter_handle)) 460 break; 461 462 adapter = i2c_acpi_find_adapter_by_handle(adapter_handle); 463 if (!adapter) 464 break; 465 466 i2c_acpi_register_device(adapter, adev, &info); 467 put_device(&adapter->dev); 468 break; 469 case ACPI_RECONFIG_DEVICE_REMOVE: 470 if (!acpi_device_enumerated(adev)) 471 break; 472 473 client = i2c_acpi_find_client_by_adev(adev); 474 if (!client) 475 break; 476 477 i2c_unregister_device(client); 478 put_device(&client->dev); 479 break; 480 } 481 482 return NOTIFY_OK; 483 } 484 485 struct notifier_block i2c_acpi_notifier = { 486 .notifier_call = i2c_acpi_notify, 487 }; 488 489 /** 490 * i2c_acpi_new_device_by_fwnode - Create i2c-client for the Nth I2cSerialBus resource 491 * @fwnode: fwnode with the ACPI resources to get the client from 492 * @index: Index of ACPI resource to get 493 * @info: describes the I2C device; note this is modified (addr gets set) 494 * Context: can sleep 495 * 496 * By default the i2c subsys creates an i2c-client for the first I2cSerialBus 497 * resource of an acpi_device, but some acpi_devices have multiple I2cSerialBus 498 * resources, in that case this function can be used to create an i2c-client 499 * for other I2cSerialBus resources in the Current Resource Settings table. 500 * 501 * Also see i2c_new_client_device, which this function calls to create the 502 * i2c-client. 503 * 504 * Returns a pointer to the new i2c-client, or error pointer in case of failure. 505 * Specifically, -EPROBE_DEFER is returned if the adapter is not found. 506 */ 507 struct i2c_client *i2c_acpi_new_device_by_fwnode(struct fwnode_handle *fwnode, 508 int index, 509 struct i2c_board_info *info) 510 { 511 struct i2c_acpi_lookup lookup; 512 struct i2c_adapter *adapter; 513 struct acpi_device *adev; 514 LIST_HEAD(resource_list); 515 int ret; 516 517 adev = to_acpi_device_node(fwnode); 518 if (!adev) 519 return ERR_PTR(-ENODEV); 520 521 memset(&lookup, 0, sizeof(lookup)); 522 lookup.info = info; 523 lookup.device_handle = acpi_device_handle(adev); 524 lookup.index = index; 525 526 ret = acpi_dev_get_resources(adev, &resource_list, 527 i2c_acpi_fill_info, &lookup); 528 if (ret < 0) 529 return ERR_PTR(ret); 530 531 acpi_dev_free_resource_list(&resource_list); 532 533 if (!info->addr) 534 return ERR_PTR(-EADDRNOTAVAIL); 535 536 adapter = i2c_acpi_find_adapter_by_handle(lookup.adapter_handle); 537 if (!adapter) 538 return ERR_PTR(-EPROBE_DEFER); 539 540 return i2c_new_client_device(adapter, info); 541 } 542 EXPORT_SYMBOL_GPL(i2c_acpi_new_device_by_fwnode); 543 544 bool i2c_acpi_waive_d0_probe(struct device *dev) 545 { 546 struct i2c_driver *driver = to_i2c_driver(dev->driver); 547 struct acpi_device *adev = ACPI_COMPANION(dev); 548 549 return driver->flags & I2C_DRV_ACPI_WAIVE_D0_PROBE && 550 adev && adev->power.state_for_enumeration >= adev->power.state; 551 } 552 EXPORT_SYMBOL_GPL(i2c_acpi_waive_d0_probe); 553 554 #ifdef CONFIG_ACPI_I2C_OPREGION 555 static int acpi_gsb_i2c_read_bytes(struct i2c_client *client, 556 u8 cmd, u8 *data, u8 data_len) 557 { 558 559 struct i2c_msg msgs[2]; 560 int ret; 561 u8 *buffer; 562 563 buffer = kzalloc(data_len, GFP_KERNEL); 564 if (!buffer) 565 return AE_NO_MEMORY; 566 567 msgs[0].addr = client->addr; 568 msgs[0].flags = client->flags; 569 msgs[0].len = 1; 570 msgs[0].buf = &cmd; 571 572 msgs[1].addr = client->addr; 573 msgs[1].flags = client->flags | I2C_M_RD; 574 msgs[1].len = data_len; 575 msgs[1].buf = buffer; 576 577 ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs)); 578 if (ret < 0) { 579 /* Getting a NACK is unfortunately normal with some DSTDs */ 580 if (ret == -EREMOTEIO) 581 dev_dbg(&client->adapter->dev, "i2c read %d bytes from client@%#x starting at reg %#x failed, error: %d\n", 582 data_len, client->addr, cmd, ret); 583 else 584 dev_err(&client->adapter->dev, "i2c read %d bytes from client@%#x starting at reg %#x failed, error: %d\n", 585 data_len, client->addr, cmd, ret); 586 /* 2 transfers must have completed successfully */ 587 } else if (ret == 2) { 588 memcpy(data, buffer, data_len); 589 ret = 0; 590 } else { 591 ret = -EIO; 592 } 593 594 kfree(buffer); 595 return ret; 596 } 597 598 static int acpi_gsb_i2c_write_bytes(struct i2c_client *client, 599 u8 cmd, u8 *data, u8 data_len) 600 { 601 602 struct i2c_msg msgs[1]; 603 u8 *buffer; 604 int ret = AE_OK; 605 606 buffer = kzalloc(data_len + 1, GFP_KERNEL); 607 if (!buffer) 608 return AE_NO_MEMORY; 609 610 buffer[0] = cmd; 611 memcpy(buffer + 1, data, data_len); 612 613 msgs[0].addr = client->addr; 614 msgs[0].flags = client->flags; 615 msgs[0].len = data_len + 1; 616 msgs[0].buf = buffer; 617 618 ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs)); 619 620 kfree(buffer); 621 622 if (ret < 0) { 623 dev_err(&client->adapter->dev, "i2c write failed: %d\n", ret); 624 return ret; 625 } 626 627 /* 1 transfer must have completed successfully */ 628 return (ret == 1) ? 0 : -EIO; 629 } 630 631 static acpi_status 632 i2c_acpi_space_handler(u32 function, acpi_physical_address command, 633 u32 bits, u64 *value64, 634 void *handler_context, void *region_context) 635 { 636 struct gsb_buffer *gsb = (struct gsb_buffer *)value64; 637 struct i2c_acpi_handler_data *data = handler_context; 638 struct acpi_connection_info *info = &data->info; 639 struct acpi_resource_i2c_serialbus *sb; 640 struct i2c_adapter *adapter = data->adapter; 641 struct i2c_client *client; 642 struct acpi_resource *ares; 643 u32 accessor_type = function >> 16; 644 u8 action = function & ACPI_IO_MASK; 645 acpi_status ret; 646 int status; 647 648 ret = acpi_buffer_to_resource(info->connection, info->length, &ares); 649 if (ACPI_FAILURE(ret)) 650 return ret; 651 652 client = kzalloc(sizeof(*client), GFP_KERNEL); 653 if (!client) { 654 ret = AE_NO_MEMORY; 655 goto err; 656 } 657 658 if (!value64 || !i2c_acpi_get_i2c_resource(ares, &sb)) { 659 ret = AE_BAD_PARAMETER; 660 goto err; 661 } 662 663 client->adapter = adapter; 664 client->addr = sb->slave_address; 665 666 if (sb->access_mode == ACPI_I2C_10BIT_MODE) 667 client->flags |= I2C_CLIENT_TEN; 668 669 switch (accessor_type) { 670 case ACPI_GSB_ACCESS_ATTRIB_SEND_RCV: 671 if (action == ACPI_READ) { 672 status = i2c_smbus_read_byte(client); 673 if (status >= 0) { 674 gsb->bdata = status; 675 status = 0; 676 } 677 } else { 678 status = i2c_smbus_write_byte(client, gsb->bdata); 679 } 680 break; 681 682 case ACPI_GSB_ACCESS_ATTRIB_BYTE: 683 if (action == ACPI_READ) { 684 status = i2c_smbus_read_byte_data(client, command); 685 if (status >= 0) { 686 gsb->bdata = status; 687 status = 0; 688 } 689 } else { 690 status = i2c_smbus_write_byte_data(client, command, 691 gsb->bdata); 692 } 693 break; 694 695 case ACPI_GSB_ACCESS_ATTRIB_WORD: 696 if (action == ACPI_READ) { 697 status = i2c_smbus_read_word_data(client, command); 698 if (status >= 0) { 699 gsb->wdata = status; 700 status = 0; 701 } 702 } else { 703 status = i2c_smbus_write_word_data(client, command, 704 gsb->wdata); 705 } 706 break; 707 708 case ACPI_GSB_ACCESS_ATTRIB_BLOCK: 709 if (action == ACPI_READ) { 710 status = i2c_smbus_read_block_data(client, command, 711 gsb->data); 712 if (status >= 0) { 713 gsb->len = status; 714 status = 0; 715 } 716 } else { 717 status = i2c_smbus_write_block_data(client, command, 718 gsb->len, gsb->data); 719 } 720 break; 721 722 case ACPI_GSB_ACCESS_ATTRIB_MULTIBYTE: 723 if (action == ACPI_READ) { 724 status = acpi_gsb_i2c_read_bytes(client, command, 725 gsb->data, info->access_length); 726 } else { 727 status = acpi_gsb_i2c_write_bytes(client, command, 728 gsb->data, info->access_length); 729 } 730 break; 731 732 default: 733 dev_warn(&adapter->dev, "protocol 0x%02x not supported for client 0x%02x\n", 734 accessor_type, client->addr); 735 ret = AE_BAD_PARAMETER; 736 goto err; 737 } 738 739 gsb->status = status; 740 741 err: 742 kfree(client); 743 ACPI_FREE(ares); 744 return ret; 745 } 746 747 748 int i2c_acpi_install_space_handler(struct i2c_adapter *adapter) 749 { 750 acpi_handle handle; 751 struct i2c_acpi_handler_data *data; 752 acpi_status status; 753 754 if (!adapter->dev.parent) 755 return -ENODEV; 756 757 handle = ACPI_HANDLE(adapter->dev.parent); 758 759 if (!handle) 760 return -ENODEV; 761 762 data = kzalloc(sizeof(struct i2c_acpi_handler_data), 763 GFP_KERNEL); 764 if (!data) 765 return -ENOMEM; 766 767 data->adapter = adapter; 768 status = acpi_bus_attach_private_data(handle, (void *)data); 769 if (ACPI_FAILURE(status)) { 770 kfree(data); 771 return -ENOMEM; 772 } 773 774 status = acpi_install_address_space_handler(handle, 775 ACPI_ADR_SPACE_GSBUS, 776 &i2c_acpi_space_handler, 777 NULL, 778 data); 779 if (ACPI_FAILURE(status)) { 780 dev_err(&adapter->dev, "Error installing i2c space handler\n"); 781 acpi_bus_detach_private_data(handle); 782 kfree(data); 783 return -ENOMEM; 784 } 785 786 return 0; 787 } 788 789 void i2c_acpi_remove_space_handler(struct i2c_adapter *adapter) 790 { 791 acpi_handle handle; 792 struct i2c_acpi_handler_data *data; 793 acpi_status status; 794 795 if (!adapter->dev.parent) 796 return; 797 798 handle = ACPI_HANDLE(adapter->dev.parent); 799 800 if (!handle) 801 return; 802 803 acpi_remove_address_space_handler(handle, 804 ACPI_ADR_SPACE_GSBUS, 805 &i2c_acpi_space_handler); 806 807 status = acpi_bus_get_private_data(handle, (void **)&data); 808 if (ACPI_SUCCESS(status)) 809 kfree(data); 810 811 acpi_bus_detach_private_data(handle); 812 } 813 #endif /* CONFIG_ACPI_I2C_OPREGION */ 814