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 * Return: 88 * The number of I2cSerialBus resources in the ACPI-device's 89 * resource-list; or a negative error code. 90 * 91 * Specifically returns -ENOENT when no resources found. 92 */ 93 int i2c_acpi_client_count(struct acpi_device *adev) 94 { 95 int ret, count = 0; 96 LIST_HEAD(r); 97 98 ret = acpi_dev_get_resources(adev, &r, i2c_acpi_resource_count, &count); 99 if (ret < 0) 100 return ret; 101 102 acpi_dev_free_resource_list(&r); 103 return count ?: -ENOENT; 104 } 105 EXPORT_SYMBOL_GPL(i2c_acpi_client_count); 106 107 static int i2c_acpi_fill_info(struct acpi_resource *ares, void *data) 108 { 109 struct i2c_acpi_lookup *lookup = data; 110 struct i2c_board_info *info = lookup->info; 111 struct acpi_resource_i2c_serialbus *sb; 112 acpi_status status; 113 114 if (info->addr || !i2c_acpi_get_i2c_resource(ares, &sb)) 115 return 1; 116 117 if (lookup->index != -1 && lookup->n++ != lookup->index) 118 return 1; 119 120 status = acpi_get_handle(lookup->device_handle, 121 sb->resource_source.string_ptr, 122 &lookup->adapter_handle); 123 if (ACPI_FAILURE(status)) 124 return 1; 125 126 info->addr = sb->slave_address; 127 lookup->speed = sb->connection_speed; 128 if (sb->access_mode == ACPI_I2C_10BIT_MODE) 129 info->flags |= I2C_CLIENT_TEN; 130 131 return 1; 132 } 133 134 struct i2c_acpi_irq_context { 135 int irq; 136 bool wake_capable; 137 }; 138 139 static int i2c_acpi_do_lookup(struct acpi_device *adev, 140 struct i2c_acpi_lookup *lookup) 141 { 142 struct i2c_board_info *info = lookup->info; 143 struct list_head resource_list; 144 int ret; 145 146 if (acpi_bus_get_status(adev)) 147 return -EINVAL; 148 149 if (!acpi_dev_ready_for_enumeration(adev)) 150 return -ENODEV; 151 152 /* 153 * ACPI video devices, which are handled by the acpi-video driver, 154 * sometimes contain a SERIAL_TYPE_I2C ACPI resource, ignore these. 155 */ 156 if (acpi_dev_is_video_device(adev)) 157 return -ENODEV; 158 159 memset(info, 0, sizeof(*info)); 160 lookup->device_handle = acpi_device_handle(adev); 161 162 /* Look up for I2cSerialBus resource */ 163 INIT_LIST_HEAD(&resource_list); 164 ret = acpi_dev_get_resources(adev, &resource_list, 165 i2c_acpi_fill_info, lookup); 166 if (ret < 0) 167 return ret; 168 169 acpi_dev_free_resource_list(&resource_list); 170 171 if (!info->addr) 172 return -EINVAL; 173 174 return 0; 175 } 176 177 static int i2c_acpi_add_irq_resource(struct acpi_resource *ares, void *data) 178 { 179 struct i2c_acpi_irq_context *irq_ctx = data; 180 struct resource r; 181 182 if (irq_ctx->irq > 0) 183 return 1; 184 185 if (!acpi_dev_resource_interrupt(ares, 0, &r)) 186 return 1; 187 188 irq_ctx->irq = i2c_dev_irq_from_resources(&r, 1); 189 irq_ctx->wake_capable = r.flags & IORESOURCE_IRQ_WAKECAPABLE; 190 191 return 1; /* No need to add resource to the list */ 192 } 193 194 /** 195 * i2c_acpi_get_irq - get device IRQ number from ACPI 196 * @client: Pointer to the I2C client device 197 * @wake_capable: Set to true if the IRQ is wake capable 198 * 199 * Find the IRQ number used by a specific client device. 200 * 201 * Return: The IRQ number or an error code. 202 */ 203 int i2c_acpi_get_irq(struct i2c_client *client, bool *wake_capable) 204 { 205 struct acpi_device *adev = ACPI_COMPANION(&client->dev); 206 struct list_head resource_list; 207 struct i2c_acpi_irq_context irq_ctx = { 208 .irq = -ENOENT, 209 }; 210 int ret; 211 212 INIT_LIST_HEAD(&resource_list); 213 214 ret = acpi_dev_get_resources(adev, &resource_list, 215 i2c_acpi_add_irq_resource, &irq_ctx); 216 if (ret < 0) 217 return ret; 218 219 acpi_dev_free_resource_list(&resource_list); 220 221 if (irq_ctx.irq == -ENOENT) 222 irq_ctx.irq = acpi_dev_gpio_irq_wake_get(adev, 0, &irq_ctx.wake_capable); 223 224 if (irq_ctx.irq < 0) 225 return irq_ctx.irq; 226 227 if (wake_capable) 228 *wake_capable = irq_ctx.wake_capable; 229 230 return irq_ctx.irq; 231 } 232 233 static int i2c_acpi_get_info(struct acpi_device *adev, 234 struct i2c_board_info *info, 235 struct i2c_adapter *adapter, 236 acpi_handle *adapter_handle) 237 { 238 struct i2c_acpi_lookup lookup; 239 int ret; 240 241 memset(&lookup, 0, sizeof(lookup)); 242 lookup.info = info; 243 lookup.index = -1; 244 245 if (acpi_device_enumerated(adev)) 246 return -EINVAL; 247 248 ret = i2c_acpi_do_lookup(adev, &lookup); 249 if (ret) 250 return ret; 251 252 if (adapter) { 253 /* The adapter must match the one in I2cSerialBus() connector */ 254 if (!device_match_acpi_handle(&adapter->dev, lookup.adapter_handle)) 255 return -ENODEV; 256 } else { 257 struct acpi_device *adapter_adev; 258 259 /* The adapter must be present */ 260 adapter_adev = acpi_fetch_acpi_dev(lookup.adapter_handle); 261 if (!adapter_adev) 262 return -ENODEV; 263 if (acpi_bus_get_status(adapter_adev) || 264 !adapter_adev->status.present) 265 return -ENODEV; 266 } 267 268 info->fwnode = acpi_fwnode_handle(adev); 269 if (adapter_handle) 270 *adapter_handle = lookup.adapter_handle; 271 272 acpi_set_modalias(adev, dev_name(&adev->dev), info->type, 273 sizeof(info->type)); 274 275 return 0; 276 } 277 278 static void i2c_acpi_register_device(struct i2c_adapter *adapter, 279 struct acpi_device *adev, 280 struct i2c_board_info *info) 281 { 282 /* 283 * Skip registration on boards where the ACPI tables are 284 * known to contain bogus I2C devices. 285 */ 286 if (acpi_quirk_skip_i2c_client_enumeration(adev)) 287 return; 288 289 adev->power.flags.ignore_parent = true; 290 acpi_device_set_enumerated(adev); 291 292 if (IS_ERR(i2c_new_client_device(adapter, info))) 293 adev->power.flags.ignore_parent = false; 294 } 295 296 static acpi_status i2c_acpi_add_device(acpi_handle handle, u32 level, 297 void *data, void **return_value) 298 { 299 struct i2c_adapter *adapter = data; 300 struct acpi_device *adev = acpi_fetch_acpi_dev(handle); 301 struct i2c_board_info info; 302 303 if (!adev || i2c_acpi_get_info(adev, &info, adapter, NULL)) 304 return AE_OK; 305 306 i2c_acpi_register_device(adapter, adev, &info); 307 308 return AE_OK; 309 } 310 311 #define I2C_ACPI_MAX_SCAN_DEPTH 32 312 313 /** 314 * i2c_acpi_register_devices - enumerate I2C slave devices behind adapter 315 * @adap: pointer to adapter 316 * 317 * Enumerate all I2C slave devices behind this adapter by walking the ACPI 318 * namespace. When a device is found it will be added to the Linux device 319 * model and bound to the corresponding ACPI handle. 320 */ 321 void i2c_acpi_register_devices(struct i2c_adapter *adap) 322 { 323 struct acpi_device *adev; 324 acpi_status status; 325 326 if (!has_acpi_companion(&adap->dev)) 327 return; 328 329 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, 330 I2C_ACPI_MAX_SCAN_DEPTH, 331 i2c_acpi_add_device, NULL, 332 adap, NULL); 333 if (ACPI_FAILURE(status)) 334 dev_warn(&adap->dev, "failed to enumerate I2C slaves\n"); 335 336 if (!adap->dev.parent) 337 return; 338 339 adev = ACPI_COMPANION(adap->dev.parent); 340 if (!adev) 341 return; 342 343 acpi_dev_clear_dependencies(adev); 344 } 345 346 static const struct acpi_device_id i2c_acpi_force_400khz_device_ids[] = { 347 /* 348 * These Silead touchscreen controllers only work at 400KHz, for 349 * some reason they do not work at 100KHz. On some devices the ACPI 350 * tables list another device at their bus as only being capable 351 * of 100KHz, testing has shown that these other devices work fine 352 * at 400KHz (as can be expected of any recent i2c hw) so we force 353 * the speed of the bus to 400 KHz if a Silead device is present. 354 */ 355 { "MSSL1680", 0 }, 356 {} 357 }; 358 359 static const struct acpi_device_id i2c_acpi_force_100khz_device_ids[] = { 360 /* 361 * When a 400KHz freq is used on this model of ELAN touchpad in Linux, 362 * excessive smoothing (similar to when the touchpad's firmware detects 363 * a noisy signal) is sometimes applied. As some devices' (e.g, Lenovo 364 * V15 G4) ACPI tables specify a 400KHz frequency for this device and 365 * some I2C busses (e.g, Designware I2C) default to a 400KHz freq, 366 * force the speed to 100KHz as a workaround. 367 * 368 * For future investigation: This problem may be related to the default 369 * HCNT/LCNT values given by some busses' drivers, because they are not 370 * specified in the aforementioned devices' ACPI tables, and because 371 * the device works without issues on Windows at what is expected to be 372 * a 400KHz frequency. The root cause of the issue is not known. 373 */ 374 { "DLL0945", 0 }, 375 { "ELAN0678", 0 }, 376 { "ELAN06FA", 0 }, 377 { "ELAN1300", 0 }, 378 {} 379 }; 380 381 static acpi_status i2c_acpi_lookup_speed(acpi_handle handle, u32 level, 382 void *data, void **return_value) 383 { 384 struct i2c_acpi_lookup *lookup = data; 385 struct acpi_device *adev = acpi_fetch_acpi_dev(handle); 386 387 if (!adev || i2c_acpi_do_lookup(adev, lookup)) 388 return AE_OK; 389 390 if (lookup->search_handle != lookup->adapter_handle) 391 return AE_OK; 392 393 if (lookup->speed <= lookup->min_speed) 394 lookup->min_speed = lookup->speed; 395 396 if (acpi_match_device_ids(adev, i2c_acpi_force_400khz_device_ids) == 0) 397 lookup->force_speed = I2C_MAX_FAST_MODE_FREQ; 398 399 if (acpi_match_device_ids(adev, i2c_acpi_force_100khz_device_ids) == 0) 400 lookup->force_speed = I2C_MAX_STANDARD_MODE_FREQ; 401 402 return AE_OK; 403 } 404 405 /** 406 * i2c_acpi_find_bus_speed - find I2C bus speed from ACPI 407 * @dev: The device owning the bus 408 * 409 * Find the I2C bus speed by walking the ACPI namespace for all I2C slaves 410 * devices connected to this bus and use the speed of slowest device. 411 * 412 * Returns the speed in Hz or zero 413 */ 414 u32 i2c_acpi_find_bus_speed(struct device *dev) 415 { 416 struct i2c_acpi_lookup lookup; 417 struct i2c_board_info dummy; 418 acpi_status status; 419 420 if (!has_acpi_companion(dev)) 421 return 0; 422 423 memset(&lookup, 0, sizeof(lookup)); 424 lookup.search_handle = ACPI_HANDLE(dev); 425 lookup.min_speed = UINT_MAX; 426 lookup.info = &dummy; 427 lookup.index = -1; 428 429 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, 430 I2C_ACPI_MAX_SCAN_DEPTH, 431 i2c_acpi_lookup_speed, NULL, 432 &lookup, NULL); 433 434 if (ACPI_FAILURE(status)) { 435 dev_warn(dev, "unable to find I2C bus speed from ACPI\n"); 436 return 0; 437 } 438 439 if (lookup.force_speed) { 440 if (lookup.force_speed != lookup.min_speed) 441 dev_warn(dev, FW_BUG "DSDT uses known not-working I2C bus speed %d, forcing it to %d\n", 442 lookup.min_speed, lookup.force_speed); 443 return lookup.force_speed; 444 } else if (lookup.min_speed != UINT_MAX) { 445 return lookup.min_speed; 446 } else { 447 return 0; 448 } 449 } 450 EXPORT_SYMBOL_GPL(i2c_acpi_find_bus_speed); 451 452 struct i2c_adapter *i2c_acpi_find_adapter_by_handle(acpi_handle handle) 453 { 454 struct i2c_adapter *adapter; 455 struct device *dev; 456 457 dev = bus_find_device(&i2c_bus_type, NULL, handle, device_match_acpi_handle); 458 if (!dev) 459 return NULL; 460 461 adapter = i2c_verify_adapter(dev); 462 if (!adapter) 463 put_device(dev); 464 465 return adapter; 466 } 467 EXPORT_SYMBOL_GPL(i2c_acpi_find_adapter_by_handle); 468 469 static struct i2c_client *i2c_acpi_find_client_by_adev(struct acpi_device *adev) 470 { 471 return i2c_find_device_by_fwnode(acpi_fwnode_handle(adev)); 472 } 473 474 static struct i2c_adapter *i2c_acpi_find_adapter_by_adev(struct acpi_device *adev) 475 { 476 return i2c_find_adapter_by_fwnode(acpi_fwnode_handle(adev)); 477 } 478 479 static int i2c_acpi_notify(struct notifier_block *nb, unsigned long value, 480 void *arg) 481 { 482 struct acpi_device *adev = arg; 483 struct i2c_board_info info; 484 acpi_handle adapter_handle; 485 struct i2c_adapter *adapter; 486 struct i2c_client *client; 487 488 switch (value) { 489 case ACPI_RECONFIG_DEVICE_ADD: 490 if (i2c_acpi_get_info(adev, &info, NULL, &adapter_handle)) 491 break; 492 493 adapter = i2c_acpi_find_adapter_by_handle(adapter_handle); 494 if (!adapter) 495 break; 496 497 i2c_acpi_register_device(adapter, adev, &info); 498 put_device(&adapter->dev); 499 break; 500 case ACPI_RECONFIG_DEVICE_REMOVE: 501 if (!acpi_device_enumerated(adev)) 502 break; 503 504 client = i2c_acpi_find_client_by_adev(adev); 505 if (client) { 506 i2c_unregister_device(client); 507 put_device(&client->dev); 508 } 509 510 adapter = i2c_acpi_find_adapter_by_adev(adev); 511 if (adapter) { 512 acpi_unbind_one(&adapter->dev); 513 put_device(&adapter->dev); 514 } 515 516 break; 517 } 518 519 return NOTIFY_OK; 520 } 521 522 struct notifier_block i2c_acpi_notifier = { 523 .notifier_call = i2c_acpi_notify, 524 }; 525 526 /** 527 * i2c_acpi_new_device_by_fwnode - Create i2c-client for the Nth I2cSerialBus resource 528 * @fwnode: fwnode with the ACPI resources to get the client from 529 * @index: Index of ACPI resource to get 530 * @info: describes the I2C device; note this is modified (addr gets set) 531 * Context: can sleep 532 * 533 * By default the i2c subsys creates an i2c-client for the first I2cSerialBus 534 * resource of an acpi_device, but some acpi_devices have multiple I2cSerialBus 535 * resources, in that case this function can be used to create an i2c-client 536 * for other I2cSerialBus resources in the Current Resource Settings table. 537 * 538 * Also see i2c_new_client_device, which this function calls to create the 539 * i2c-client. 540 * 541 * Returns a pointer to the new i2c-client, or error pointer in case of failure. 542 * Specifically, -EPROBE_DEFER is returned if the adapter is not found. 543 */ 544 struct i2c_client *i2c_acpi_new_device_by_fwnode(struct fwnode_handle *fwnode, 545 int index, 546 struct i2c_board_info *info) 547 { 548 struct i2c_acpi_lookup lookup; 549 struct i2c_adapter *adapter; 550 struct acpi_device *adev; 551 LIST_HEAD(resource_list); 552 int ret; 553 554 adev = to_acpi_device_node(fwnode); 555 if (!adev) 556 return ERR_PTR(-ENODEV); 557 558 memset(&lookup, 0, sizeof(lookup)); 559 lookup.info = info; 560 lookup.device_handle = acpi_device_handle(adev); 561 lookup.index = index; 562 563 ret = acpi_dev_get_resources(adev, &resource_list, 564 i2c_acpi_fill_info, &lookup); 565 if (ret < 0) 566 return ERR_PTR(ret); 567 568 acpi_dev_free_resource_list(&resource_list); 569 570 if (!info->addr) 571 return ERR_PTR(-EADDRNOTAVAIL); 572 573 adapter = i2c_acpi_find_adapter_by_handle(lookup.adapter_handle); 574 if (!adapter) 575 return ERR_PTR(-EPROBE_DEFER); 576 577 return i2c_new_client_device(adapter, info); 578 } 579 EXPORT_SYMBOL_GPL(i2c_acpi_new_device_by_fwnode); 580 581 bool i2c_acpi_waive_d0_probe(struct device *dev) 582 { 583 struct i2c_driver *driver = to_i2c_driver(dev->driver); 584 struct acpi_device *adev = ACPI_COMPANION(dev); 585 586 return driver->flags & I2C_DRV_ACPI_WAIVE_D0_PROBE && 587 adev && adev->power.state_for_enumeration >= adev->power.state; 588 } 589 EXPORT_SYMBOL_GPL(i2c_acpi_waive_d0_probe); 590 591 #ifdef CONFIG_ACPI_I2C_OPREGION 592 static int acpi_gsb_i2c_read_bytes(struct i2c_client *client, 593 u8 cmd, u8 *data, u8 data_len) 594 { 595 596 struct i2c_msg msgs[2]; 597 int ret; 598 u8 *buffer; 599 600 buffer = kzalloc(data_len, GFP_KERNEL); 601 if (!buffer) 602 return AE_NO_MEMORY; 603 604 msgs[0].addr = client->addr; 605 msgs[0].flags = client->flags; 606 msgs[0].len = 1; 607 msgs[0].buf = &cmd; 608 609 msgs[1].addr = client->addr; 610 msgs[1].flags = client->flags | I2C_M_RD; 611 msgs[1].len = data_len; 612 msgs[1].buf = buffer; 613 614 ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs)); 615 if (ret < 0) { 616 /* Getting a NACK is unfortunately normal with some DSTDs */ 617 if (ret == -EREMOTEIO) 618 dev_dbg(&client->adapter->dev, "i2c read %d bytes from client@%#x starting at reg %#x failed, error: %d\n", 619 data_len, client->addr, cmd, ret); 620 else 621 dev_err(&client->adapter->dev, "i2c read %d bytes from client@%#x starting at reg %#x failed, error: %d\n", 622 data_len, client->addr, cmd, ret); 623 /* 2 transfers must have completed successfully */ 624 } else if (ret == 2) { 625 memcpy(data, buffer, data_len); 626 ret = 0; 627 } else { 628 ret = -EIO; 629 } 630 631 kfree(buffer); 632 return ret; 633 } 634 635 static int acpi_gsb_i2c_write_bytes(struct i2c_client *client, 636 u8 cmd, u8 *data, u8 data_len) 637 { 638 639 struct i2c_msg msgs[1]; 640 u8 *buffer; 641 int ret = AE_OK; 642 643 buffer = kzalloc(data_len + 1, GFP_KERNEL); 644 if (!buffer) 645 return AE_NO_MEMORY; 646 647 buffer[0] = cmd; 648 memcpy(buffer + 1, data, data_len); 649 650 msgs[0].addr = client->addr; 651 msgs[0].flags = client->flags; 652 msgs[0].len = data_len + 1; 653 msgs[0].buf = buffer; 654 655 ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs)); 656 657 kfree(buffer); 658 659 if (ret < 0) { 660 dev_err(&client->adapter->dev, "i2c write failed: %d\n", ret); 661 return ret; 662 } 663 664 /* 1 transfer must have completed successfully */ 665 return (ret == 1) ? 0 : -EIO; 666 } 667 668 static acpi_status 669 i2c_acpi_space_handler(u32 function, acpi_physical_address command, 670 u32 bits, u64 *value64, 671 void *handler_context, void *region_context) 672 { 673 struct gsb_buffer *gsb = (struct gsb_buffer *)value64; 674 struct i2c_acpi_handler_data *data = handler_context; 675 struct acpi_connection_info *info = &data->info; 676 struct acpi_resource_i2c_serialbus *sb; 677 struct i2c_adapter *adapter = data->adapter; 678 struct i2c_client *client; 679 struct acpi_resource *ares; 680 u32 accessor_type = function >> 16; 681 u8 action = function & ACPI_IO_MASK; 682 acpi_status ret; 683 int status; 684 685 ret = acpi_buffer_to_resource(info->connection, info->length, &ares); 686 if (ACPI_FAILURE(ret)) 687 return ret; 688 689 client = kzalloc_obj(*client); 690 if (!client) { 691 ret = AE_NO_MEMORY; 692 goto err; 693 } 694 695 if (!value64 || !i2c_acpi_get_i2c_resource(ares, &sb)) { 696 ret = AE_BAD_PARAMETER; 697 goto err; 698 } 699 700 client->adapter = adapter; 701 client->addr = sb->slave_address; 702 703 if (sb->access_mode == ACPI_I2C_10BIT_MODE) 704 client->flags |= I2C_CLIENT_TEN; 705 706 switch (accessor_type) { 707 case ACPI_GSB_ACCESS_ATTRIB_SEND_RCV: 708 if (action == ACPI_READ) { 709 status = i2c_smbus_read_byte(client); 710 if (status >= 0) { 711 gsb->bdata = status; 712 status = 0; 713 } 714 } else { 715 status = i2c_smbus_write_byte(client, gsb->bdata); 716 } 717 break; 718 719 case ACPI_GSB_ACCESS_ATTRIB_BYTE: 720 if (action == ACPI_READ) { 721 status = i2c_smbus_read_byte_data(client, command); 722 if (status >= 0) { 723 gsb->bdata = status; 724 status = 0; 725 } 726 } else { 727 status = i2c_smbus_write_byte_data(client, command, 728 gsb->bdata); 729 } 730 break; 731 732 case ACPI_GSB_ACCESS_ATTRIB_WORD: 733 if (action == ACPI_READ) { 734 status = i2c_smbus_read_word_data(client, command); 735 if (status >= 0) { 736 gsb->wdata = status; 737 status = 0; 738 } 739 } else { 740 status = i2c_smbus_write_word_data(client, command, 741 gsb->wdata); 742 } 743 break; 744 745 case ACPI_GSB_ACCESS_ATTRIB_BLOCK: 746 if (action == ACPI_READ) { 747 status = i2c_smbus_read_block_data(client, command, 748 gsb->data); 749 if (status >= 0) { 750 gsb->len = status; 751 status = 0; 752 } 753 } else { 754 status = i2c_smbus_write_block_data(client, command, 755 gsb->len, gsb->data); 756 } 757 break; 758 759 case ACPI_GSB_ACCESS_ATTRIB_MULTIBYTE: 760 if (action == ACPI_READ) { 761 status = acpi_gsb_i2c_read_bytes(client, command, 762 gsb->data, info->access_length); 763 } else { 764 status = acpi_gsb_i2c_write_bytes(client, command, 765 gsb->data, info->access_length); 766 } 767 break; 768 769 default: 770 dev_warn(&adapter->dev, "protocol 0x%02x not supported for client 0x%02x\n", 771 accessor_type, client->addr); 772 ret = AE_BAD_PARAMETER; 773 goto err; 774 } 775 776 gsb->status = status; 777 778 err: 779 kfree(client); 780 ACPI_FREE(ares); 781 return ret; 782 } 783 784 785 int i2c_acpi_install_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 -ENODEV; 793 794 handle = ACPI_HANDLE(adapter->dev.parent); 795 796 if (!handle) 797 return -ENODEV; 798 799 data = kzalloc_obj(struct i2c_acpi_handler_data); 800 if (!data) 801 return -ENOMEM; 802 803 data->adapter = adapter; 804 status = acpi_bus_attach_private_data(handle, (void *)data); 805 if (ACPI_FAILURE(status)) { 806 kfree(data); 807 return -ENOMEM; 808 } 809 810 status = acpi_install_address_space_handler(handle, 811 ACPI_ADR_SPACE_GSBUS, 812 &i2c_acpi_space_handler, 813 NULL, 814 data); 815 if (ACPI_FAILURE(status)) { 816 dev_err(&adapter->dev, "Error installing i2c space handler\n"); 817 acpi_bus_detach_private_data(handle); 818 kfree(data); 819 return -ENOMEM; 820 } 821 822 return 0; 823 } 824 825 void i2c_acpi_remove_space_handler(struct i2c_adapter *adapter) 826 { 827 acpi_handle handle; 828 struct i2c_acpi_handler_data *data; 829 acpi_status status; 830 831 if (!adapter->dev.parent) 832 return; 833 834 handle = ACPI_HANDLE(adapter->dev.parent); 835 836 if (!handle) 837 return; 838 839 acpi_remove_address_space_handler(handle, 840 ACPI_ADR_SPACE_GSBUS, 841 &i2c_acpi_space_handler); 842 843 status = acpi_bus_get_private_data(handle, (void **)&data); 844 if (ACPI_SUCCESS(status)) 845 kfree(data); 846 847 acpi_bus_detach_private_data(handle); 848 } 849 #endif /* CONFIG_ACPI_I2C_OPREGION */ 850