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 struct i2c_adapter *i2c_acpi_find_adapter_by_adev(struct acpi_device *adev) 449 { 450 return i2c_find_adapter_by_fwnode(acpi_fwnode_handle(adev)); 451 } 452 453 static int i2c_acpi_notify(struct notifier_block *nb, unsigned long value, 454 void *arg) 455 { 456 struct acpi_device *adev = arg; 457 struct i2c_board_info info; 458 acpi_handle adapter_handle; 459 struct i2c_adapter *adapter; 460 struct i2c_client *client; 461 462 switch (value) { 463 case ACPI_RECONFIG_DEVICE_ADD: 464 if (i2c_acpi_get_info(adev, &info, NULL, &adapter_handle)) 465 break; 466 467 adapter = i2c_acpi_find_adapter_by_handle(adapter_handle); 468 if (!adapter) 469 break; 470 471 i2c_acpi_register_device(adapter, adev, &info); 472 put_device(&adapter->dev); 473 break; 474 case ACPI_RECONFIG_DEVICE_REMOVE: 475 if (!acpi_device_enumerated(adev)) 476 break; 477 478 client = i2c_acpi_find_client_by_adev(adev); 479 if (client) { 480 i2c_unregister_device(client); 481 put_device(&client->dev); 482 } 483 484 adapter = i2c_acpi_find_adapter_by_adev(adev); 485 if (adapter) { 486 acpi_unbind_one(&adapter->dev); 487 put_device(&adapter->dev); 488 } 489 490 break; 491 } 492 493 return NOTIFY_OK; 494 } 495 496 struct notifier_block i2c_acpi_notifier = { 497 .notifier_call = i2c_acpi_notify, 498 }; 499 500 /** 501 * i2c_acpi_new_device_by_fwnode - Create i2c-client for the Nth I2cSerialBus resource 502 * @fwnode: fwnode with the ACPI resources to get the client from 503 * @index: Index of ACPI resource to get 504 * @info: describes the I2C device; note this is modified (addr gets set) 505 * Context: can sleep 506 * 507 * By default the i2c subsys creates an i2c-client for the first I2cSerialBus 508 * resource of an acpi_device, but some acpi_devices have multiple I2cSerialBus 509 * resources, in that case this function can be used to create an i2c-client 510 * for other I2cSerialBus resources in the Current Resource Settings table. 511 * 512 * Also see i2c_new_client_device, which this function calls to create the 513 * i2c-client. 514 * 515 * Returns a pointer to the new i2c-client, or error pointer in case of failure. 516 * Specifically, -EPROBE_DEFER is returned if the adapter is not found. 517 */ 518 struct i2c_client *i2c_acpi_new_device_by_fwnode(struct fwnode_handle *fwnode, 519 int index, 520 struct i2c_board_info *info) 521 { 522 struct i2c_acpi_lookup lookup; 523 struct i2c_adapter *adapter; 524 struct acpi_device *adev; 525 LIST_HEAD(resource_list); 526 int ret; 527 528 adev = to_acpi_device_node(fwnode); 529 if (!adev) 530 return ERR_PTR(-ENODEV); 531 532 memset(&lookup, 0, sizeof(lookup)); 533 lookup.info = info; 534 lookup.device_handle = acpi_device_handle(adev); 535 lookup.index = index; 536 537 ret = acpi_dev_get_resources(adev, &resource_list, 538 i2c_acpi_fill_info, &lookup); 539 if (ret < 0) 540 return ERR_PTR(ret); 541 542 acpi_dev_free_resource_list(&resource_list); 543 544 if (!info->addr) 545 return ERR_PTR(-EADDRNOTAVAIL); 546 547 adapter = i2c_acpi_find_adapter_by_handle(lookup.adapter_handle); 548 if (!adapter) 549 return ERR_PTR(-EPROBE_DEFER); 550 551 return i2c_new_client_device(adapter, info); 552 } 553 EXPORT_SYMBOL_GPL(i2c_acpi_new_device_by_fwnode); 554 555 bool i2c_acpi_waive_d0_probe(struct device *dev) 556 { 557 struct i2c_driver *driver = to_i2c_driver(dev->driver); 558 struct acpi_device *adev = ACPI_COMPANION(dev); 559 560 return driver->flags & I2C_DRV_ACPI_WAIVE_D0_PROBE && 561 adev && adev->power.state_for_enumeration >= adev->power.state; 562 } 563 EXPORT_SYMBOL_GPL(i2c_acpi_waive_d0_probe); 564 565 #ifdef CONFIG_ACPI_I2C_OPREGION 566 static int acpi_gsb_i2c_read_bytes(struct i2c_client *client, 567 u8 cmd, u8 *data, u8 data_len) 568 { 569 570 struct i2c_msg msgs[2]; 571 int ret; 572 u8 *buffer; 573 574 buffer = kzalloc(data_len, GFP_KERNEL); 575 if (!buffer) 576 return AE_NO_MEMORY; 577 578 msgs[0].addr = client->addr; 579 msgs[0].flags = client->flags; 580 msgs[0].len = 1; 581 msgs[0].buf = &cmd; 582 583 msgs[1].addr = client->addr; 584 msgs[1].flags = client->flags | I2C_M_RD; 585 msgs[1].len = data_len; 586 msgs[1].buf = buffer; 587 588 ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs)); 589 if (ret < 0) { 590 /* Getting a NACK is unfortunately normal with some DSTDs */ 591 if (ret == -EREMOTEIO) 592 dev_dbg(&client->adapter->dev, "i2c read %d bytes from client@%#x starting at reg %#x failed, error: %d\n", 593 data_len, client->addr, cmd, ret); 594 else 595 dev_err(&client->adapter->dev, "i2c read %d bytes from client@%#x starting at reg %#x failed, error: %d\n", 596 data_len, client->addr, cmd, ret); 597 /* 2 transfers must have completed successfully */ 598 } else if (ret == 2) { 599 memcpy(data, buffer, data_len); 600 ret = 0; 601 } else { 602 ret = -EIO; 603 } 604 605 kfree(buffer); 606 return ret; 607 } 608 609 static int acpi_gsb_i2c_write_bytes(struct i2c_client *client, 610 u8 cmd, u8 *data, u8 data_len) 611 { 612 613 struct i2c_msg msgs[1]; 614 u8 *buffer; 615 int ret = AE_OK; 616 617 buffer = kzalloc(data_len + 1, GFP_KERNEL); 618 if (!buffer) 619 return AE_NO_MEMORY; 620 621 buffer[0] = cmd; 622 memcpy(buffer + 1, data, data_len); 623 624 msgs[0].addr = client->addr; 625 msgs[0].flags = client->flags; 626 msgs[0].len = data_len + 1; 627 msgs[0].buf = buffer; 628 629 ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs)); 630 631 kfree(buffer); 632 633 if (ret < 0) { 634 dev_err(&client->adapter->dev, "i2c write failed: %d\n", ret); 635 return ret; 636 } 637 638 /* 1 transfer must have completed successfully */ 639 return (ret == 1) ? 0 : -EIO; 640 } 641 642 static acpi_status 643 i2c_acpi_space_handler(u32 function, acpi_physical_address command, 644 u32 bits, u64 *value64, 645 void *handler_context, void *region_context) 646 { 647 struct gsb_buffer *gsb = (struct gsb_buffer *)value64; 648 struct i2c_acpi_handler_data *data = handler_context; 649 struct acpi_connection_info *info = &data->info; 650 struct acpi_resource_i2c_serialbus *sb; 651 struct i2c_adapter *adapter = data->adapter; 652 struct i2c_client *client; 653 struct acpi_resource *ares; 654 u32 accessor_type = function >> 16; 655 u8 action = function & ACPI_IO_MASK; 656 acpi_status ret; 657 int status; 658 659 ret = acpi_buffer_to_resource(info->connection, info->length, &ares); 660 if (ACPI_FAILURE(ret)) 661 return ret; 662 663 client = kzalloc(sizeof(*client), GFP_KERNEL); 664 if (!client) { 665 ret = AE_NO_MEMORY; 666 goto err; 667 } 668 669 if (!value64 || !i2c_acpi_get_i2c_resource(ares, &sb)) { 670 ret = AE_BAD_PARAMETER; 671 goto err; 672 } 673 674 client->adapter = adapter; 675 client->addr = sb->slave_address; 676 677 if (sb->access_mode == ACPI_I2C_10BIT_MODE) 678 client->flags |= I2C_CLIENT_TEN; 679 680 switch (accessor_type) { 681 case ACPI_GSB_ACCESS_ATTRIB_SEND_RCV: 682 if (action == ACPI_READ) { 683 status = i2c_smbus_read_byte(client); 684 if (status >= 0) { 685 gsb->bdata = status; 686 status = 0; 687 } 688 } else { 689 status = i2c_smbus_write_byte(client, gsb->bdata); 690 } 691 break; 692 693 case ACPI_GSB_ACCESS_ATTRIB_BYTE: 694 if (action == ACPI_READ) { 695 status = i2c_smbus_read_byte_data(client, command); 696 if (status >= 0) { 697 gsb->bdata = status; 698 status = 0; 699 } 700 } else { 701 status = i2c_smbus_write_byte_data(client, command, 702 gsb->bdata); 703 } 704 break; 705 706 case ACPI_GSB_ACCESS_ATTRIB_WORD: 707 if (action == ACPI_READ) { 708 status = i2c_smbus_read_word_data(client, command); 709 if (status >= 0) { 710 gsb->wdata = status; 711 status = 0; 712 } 713 } else { 714 status = i2c_smbus_write_word_data(client, command, 715 gsb->wdata); 716 } 717 break; 718 719 case ACPI_GSB_ACCESS_ATTRIB_BLOCK: 720 if (action == ACPI_READ) { 721 status = i2c_smbus_read_block_data(client, command, 722 gsb->data); 723 if (status >= 0) { 724 gsb->len = status; 725 status = 0; 726 } 727 } else { 728 status = i2c_smbus_write_block_data(client, command, 729 gsb->len, gsb->data); 730 } 731 break; 732 733 case ACPI_GSB_ACCESS_ATTRIB_MULTIBYTE: 734 if (action == ACPI_READ) { 735 status = acpi_gsb_i2c_read_bytes(client, command, 736 gsb->data, info->access_length); 737 } else { 738 status = acpi_gsb_i2c_write_bytes(client, command, 739 gsb->data, info->access_length); 740 } 741 break; 742 743 default: 744 dev_warn(&adapter->dev, "protocol 0x%02x not supported for client 0x%02x\n", 745 accessor_type, client->addr); 746 ret = AE_BAD_PARAMETER; 747 goto err; 748 } 749 750 gsb->status = status; 751 752 err: 753 kfree(client); 754 ACPI_FREE(ares); 755 return ret; 756 } 757 758 759 int i2c_acpi_install_space_handler(struct i2c_adapter *adapter) 760 { 761 acpi_handle handle; 762 struct i2c_acpi_handler_data *data; 763 acpi_status status; 764 765 if (!adapter->dev.parent) 766 return -ENODEV; 767 768 handle = ACPI_HANDLE(adapter->dev.parent); 769 770 if (!handle) 771 return -ENODEV; 772 773 data = kzalloc(sizeof(struct i2c_acpi_handler_data), 774 GFP_KERNEL); 775 if (!data) 776 return -ENOMEM; 777 778 data->adapter = adapter; 779 status = acpi_bus_attach_private_data(handle, (void *)data); 780 if (ACPI_FAILURE(status)) { 781 kfree(data); 782 return -ENOMEM; 783 } 784 785 status = acpi_install_address_space_handler(handle, 786 ACPI_ADR_SPACE_GSBUS, 787 &i2c_acpi_space_handler, 788 NULL, 789 data); 790 if (ACPI_FAILURE(status)) { 791 dev_err(&adapter->dev, "Error installing i2c space handler\n"); 792 acpi_bus_detach_private_data(handle); 793 kfree(data); 794 return -ENOMEM; 795 } 796 797 return 0; 798 } 799 800 void i2c_acpi_remove_space_handler(struct i2c_adapter *adapter) 801 { 802 acpi_handle handle; 803 struct i2c_acpi_handler_data *data; 804 acpi_status status; 805 806 if (!adapter->dev.parent) 807 return; 808 809 handle = ACPI_HANDLE(adapter->dev.parent); 810 811 if (!handle) 812 return; 813 814 acpi_remove_address_space_handler(handle, 815 ACPI_ADR_SPACE_GSBUS, 816 &i2c_acpi_space_handler); 817 818 status = acpi_bus_get_private_data(handle, (void **)&data); 819 if (ACPI_SUCCESS(status)) 820 kfree(data); 821 822 acpi_bus_detach_private_data(handle); 823 } 824 #endif /* CONFIG_ACPI_I2C_OPREGION */ 825