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 (!device_match_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 const struct acpi_device_id i2c_acpi_force_100khz_device_ids[] = { 359 /* 360 * When a 400KHz freq is used on this model of ELAN touchpad in Linux, 361 * excessive smoothing (similar to when the touchpad's firmware detects 362 * a noisy signal) is sometimes applied. As some devices' (e.g, Lenovo 363 * V15 G4) ACPI tables specify a 400KHz frequency for this device and 364 * some I2C busses (e.g, Designware I2C) default to a 400KHz freq, 365 * force the speed to 100KHz as a workaround. 366 * 367 * For future investigation: This problem may be related to the default 368 * HCNT/LCNT values given by some busses' drivers, because they are not 369 * specified in the aforementioned devices' ACPI tables, and because 370 * the device works without issues on Windows at what is expected to be 371 * a 400KHz frequency. The root cause of the issue is not known. 372 */ 373 { "DLL0945", 0 }, 374 { "ELAN0678", 0 }, 375 { "ELAN06FA", 0 }, 376 {} 377 }; 378 379 static acpi_status i2c_acpi_lookup_speed(acpi_handle handle, u32 level, 380 void *data, void **return_value) 381 { 382 struct i2c_acpi_lookup *lookup = data; 383 struct acpi_device *adev = acpi_fetch_acpi_dev(handle); 384 385 if (!adev || i2c_acpi_do_lookup(adev, lookup)) 386 return AE_OK; 387 388 if (lookup->search_handle != lookup->adapter_handle) 389 return AE_OK; 390 391 if (lookup->speed <= lookup->min_speed) 392 lookup->min_speed = lookup->speed; 393 394 if (acpi_match_device_ids(adev, i2c_acpi_force_400khz_device_ids) == 0) 395 lookup->force_speed = I2C_MAX_FAST_MODE_FREQ; 396 397 if (acpi_match_device_ids(adev, i2c_acpi_force_100khz_device_ids) == 0) 398 lookup->force_speed = I2C_MAX_STANDARD_MODE_FREQ; 399 400 return AE_OK; 401 } 402 403 /** 404 * i2c_acpi_find_bus_speed - find I2C bus speed from ACPI 405 * @dev: The device owning the bus 406 * 407 * Find the I2C bus speed by walking the ACPI namespace for all I2C slaves 408 * devices connected to this bus and use the speed of slowest device. 409 * 410 * Returns the speed in Hz or zero 411 */ 412 u32 i2c_acpi_find_bus_speed(struct device *dev) 413 { 414 struct i2c_acpi_lookup lookup; 415 struct i2c_board_info dummy; 416 acpi_status status; 417 418 if (!has_acpi_companion(dev)) 419 return 0; 420 421 memset(&lookup, 0, sizeof(lookup)); 422 lookup.search_handle = ACPI_HANDLE(dev); 423 lookup.min_speed = UINT_MAX; 424 lookup.info = &dummy; 425 lookup.index = -1; 426 427 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, 428 I2C_ACPI_MAX_SCAN_DEPTH, 429 i2c_acpi_lookup_speed, NULL, 430 &lookup, NULL); 431 432 if (ACPI_FAILURE(status)) { 433 dev_warn(dev, "unable to find I2C bus speed from ACPI\n"); 434 return 0; 435 } 436 437 if (lookup.force_speed) { 438 if (lookup.force_speed != lookup.min_speed) 439 dev_warn(dev, FW_BUG "DSDT uses known not-working I2C bus speed %d, forcing it to %d\n", 440 lookup.min_speed, lookup.force_speed); 441 return lookup.force_speed; 442 } else if (lookup.min_speed != UINT_MAX) { 443 return lookup.min_speed; 444 } else { 445 return 0; 446 } 447 } 448 EXPORT_SYMBOL_GPL(i2c_acpi_find_bus_speed); 449 450 struct i2c_adapter *i2c_acpi_find_adapter_by_handle(acpi_handle handle) 451 { 452 struct i2c_adapter *adapter; 453 struct device *dev; 454 455 dev = bus_find_device(&i2c_bus_type, NULL, handle, device_match_acpi_handle); 456 if (!dev) 457 return NULL; 458 459 adapter = i2c_verify_adapter(dev); 460 if (!adapter) 461 put_device(dev); 462 463 return adapter; 464 } 465 EXPORT_SYMBOL_GPL(i2c_acpi_find_adapter_by_handle); 466 467 static struct i2c_client *i2c_acpi_find_client_by_adev(struct acpi_device *adev) 468 { 469 return i2c_find_device_by_fwnode(acpi_fwnode_handle(adev)); 470 } 471 472 static struct i2c_adapter *i2c_acpi_find_adapter_by_adev(struct acpi_device *adev) 473 { 474 return i2c_find_adapter_by_fwnode(acpi_fwnode_handle(adev)); 475 } 476 477 static int i2c_acpi_notify(struct notifier_block *nb, unsigned long value, 478 void *arg) 479 { 480 struct acpi_device *adev = arg; 481 struct i2c_board_info info; 482 acpi_handle adapter_handle; 483 struct i2c_adapter *adapter; 484 struct i2c_client *client; 485 486 switch (value) { 487 case ACPI_RECONFIG_DEVICE_ADD: 488 if (i2c_acpi_get_info(adev, &info, NULL, &adapter_handle)) 489 break; 490 491 adapter = i2c_acpi_find_adapter_by_handle(adapter_handle); 492 if (!adapter) 493 break; 494 495 i2c_acpi_register_device(adapter, adev, &info); 496 put_device(&adapter->dev); 497 break; 498 case ACPI_RECONFIG_DEVICE_REMOVE: 499 if (!acpi_device_enumerated(adev)) 500 break; 501 502 client = i2c_acpi_find_client_by_adev(adev); 503 if (client) { 504 i2c_unregister_device(client); 505 put_device(&client->dev); 506 } 507 508 adapter = i2c_acpi_find_adapter_by_adev(adev); 509 if (adapter) { 510 acpi_unbind_one(&adapter->dev); 511 put_device(&adapter->dev); 512 } 513 514 break; 515 } 516 517 return NOTIFY_OK; 518 } 519 520 struct notifier_block i2c_acpi_notifier = { 521 .notifier_call = i2c_acpi_notify, 522 }; 523 524 /** 525 * i2c_acpi_new_device_by_fwnode - Create i2c-client for the Nth I2cSerialBus resource 526 * @fwnode: fwnode with the ACPI resources to get the client from 527 * @index: Index of ACPI resource to get 528 * @info: describes the I2C device; note this is modified (addr gets set) 529 * Context: can sleep 530 * 531 * By default the i2c subsys creates an i2c-client for the first I2cSerialBus 532 * resource of an acpi_device, but some acpi_devices have multiple I2cSerialBus 533 * resources, in that case this function can be used to create an i2c-client 534 * for other I2cSerialBus resources in the Current Resource Settings table. 535 * 536 * Also see i2c_new_client_device, which this function calls to create the 537 * i2c-client. 538 * 539 * Returns a pointer to the new i2c-client, or error pointer in case of failure. 540 * Specifically, -EPROBE_DEFER is returned if the adapter is not found. 541 */ 542 struct i2c_client *i2c_acpi_new_device_by_fwnode(struct fwnode_handle *fwnode, 543 int index, 544 struct i2c_board_info *info) 545 { 546 struct i2c_acpi_lookup lookup; 547 struct i2c_adapter *adapter; 548 struct acpi_device *adev; 549 LIST_HEAD(resource_list); 550 int ret; 551 552 adev = to_acpi_device_node(fwnode); 553 if (!adev) 554 return ERR_PTR(-ENODEV); 555 556 memset(&lookup, 0, sizeof(lookup)); 557 lookup.info = info; 558 lookup.device_handle = acpi_device_handle(adev); 559 lookup.index = index; 560 561 ret = acpi_dev_get_resources(adev, &resource_list, 562 i2c_acpi_fill_info, &lookup); 563 if (ret < 0) 564 return ERR_PTR(ret); 565 566 acpi_dev_free_resource_list(&resource_list); 567 568 if (!info->addr) 569 return ERR_PTR(-EADDRNOTAVAIL); 570 571 adapter = i2c_acpi_find_adapter_by_handle(lookup.adapter_handle); 572 if (!adapter) 573 return ERR_PTR(-EPROBE_DEFER); 574 575 return i2c_new_client_device(adapter, info); 576 } 577 EXPORT_SYMBOL_GPL(i2c_acpi_new_device_by_fwnode); 578 579 bool i2c_acpi_waive_d0_probe(struct device *dev) 580 { 581 struct i2c_driver *driver = to_i2c_driver(dev->driver); 582 struct acpi_device *adev = ACPI_COMPANION(dev); 583 584 return driver->flags & I2C_DRV_ACPI_WAIVE_D0_PROBE && 585 adev && adev->power.state_for_enumeration >= adev->power.state; 586 } 587 EXPORT_SYMBOL_GPL(i2c_acpi_waive_d0_probe); 588 589 #ifdef CONFIG_ACPI_I2C_OPREGION 590 static int acpi_gsb_i2c_read_bytes(struct i2c_client *client, 591 u8 cmd, u8 *data, u8 data_len) 592 { 593 594 struct i2c_msg msgs[2]; 595 int ret; 596 u8 *buffer; 597 598 buffer = kzalloc(data_len, GFP_KERNEL); 599 if (!buffer) 600 return AE_NO_MEMORY; 601 602 msgs[0].addr = client->addr; 603 msgs[0].flags = client->flags; 604 msgs[0].len = 1; 605 msgs[0].buf = &cmd; 606 607 msgs[1].addr = client->addr; 608 msgs[1].flags = client->flags | I2C_M_RD; 609 msgs[1].len = data_len; 610 msgs[1].buf = buffer; 611 612 ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs)); 613 if (ret < 0) { 614 /* Getting a NACK is unfortunately normal with some DSTDs */ 615 if (ret == -EREMOTEIO) 616 dev_dbg(&client->adapter->dev, "i2c read %d bytes from client@%#x starting at reg %#x failed, error: %d\n", 617 data_len, client->addr, cmd, ret); 618 else 619 dev_err(&client->adapter->dev, "i2c read %d bytes from client@%#x starting at reg %#x failed, error: %d\n", 620 data_len, client->addr, cmd, ret); 621 /* 2 transfers must have completed successfully */ 622 } else if (ret == 2) { 623 memcpy(data, buffer, data_len); 624 ret = 0; 625 } else { 626 ret = -EIO; 627 } 628 629 kfree(buffer); 630 return ret; 631 } 632 633 static int acpi_gsb_i2c_write_bytes(struct i2c_client *client, 634 u8 cmd, u8 *data, u8 data_len) 635 { 636 637 struct i2c_msg msgs[1]; 638 u8 *buffer; 639 int ret = AE_OK; 640 641 buffer = kzalloc(data_len + 1, GFP_KERNEL); 642 if (!buffer) 643 return AE_NO_MEMORY; 644 645 buffer[0] = cmd; 646 memcpy(buffer + 1, data, data_len); 647 648 msgs[0].addr = client->addr; 649 msgs[0].flags = client->flags; 650 msgs[0].len = data_len + 1; 651 msgs[0].buf = buffer; 652 653 ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs)); 654 655 kfree(buffer); 656 657 if (ret < 0) { 658 dev_err(&client->adapter->dev, "i2c write failed: %d\n", ret); 659 return ret; 660 } 661 662 /* 1 transfer must have completed successfully */ 663 return (ret == 1) ? 0 : -EIO; 664 } 665 666 static acpi_status 667 i2c_acpi_space_handler(u32 function, acpi_physical_address command, 668 u32 bits, u64 *value64, 669 void *handler_context, void *region_context) 670 { 671 struct gsb_buffer *gsb = (struct gsb_buffer *)value64; 672 struct i2c_acpi_handler_data *data = handler_context; 673 struct acpi_connection_info *info = &data->info; 674 struct acpi_resource_i2c_serialbus *sb; 675 struct i2c_adapter *adapter = data->adapter; 676 struct i2c_client *client; 677 struct acpi_resource *ares; 678 u32 accessor_type = function >> 16; 679 u8 action = function & ACPI_IO_MASK; 680 acpi_status ret; 681 int status; 682 683 ret = acpi_buffer_to_resource(info->connection, info->length, &ares); 684 if (ACPI_FAILURE(ret)) 685 return ret; 686 687 client = kzalloc_obj(*client); 688 if (!client) { 689 ret = AE_NO_MEMORY; 690 goto err; 691 } 692 693 if (!value64 || !i2c_acpi_get_i2c_resource(ares, &sb)) { 694 ret = AE_BAD_PARAMETER; 695 goto err; 696 } 697 698 client->adapter = adapter; 699 client->addr = sb->slave_address; 700 701 if (sb->access_mode == ACPI_I2C_10BIT_MODE) 702 client->flags |= I2C_CLIENT_TEN; 703 704 switch (accessor_type) { 705 case ACPI_GSB_ACCESS_ATTRIB_SEND_RCV: 706 if (action == ACPI_READ) { 707 status = i2c_smbus_read_byte(client); 708 if (status >= 0) { 709 gsb->bdata = status; 710 status = 0; 711 } 712 } else { 713 status = i2c_smbus_write_byte(client, gsb->bdata); 714 } 715 break; 716 717 case ACPI_GSB_ACCESS_ATTRIB_BYTE: 718 if (action == ACPI_READ) { 719 status = i2c_smbus_read_byte_data(client, command); 720 if (status >= 0) { 721 gsb->bdata = status; 722 status = 0; 723 } 724 } else { 725 status = i2c_smbus_write_byte_data(client, command, 726 gsb->bdata); 727 } 728 break; 729 730 case ACPI_GSB_ACCESS_ATTRIB_WORD: 731 if (action == ACPI_READ) { 732 status = i2c_smbus_read_word_data(client, command); 733 if (status >= 0) { 734 gsb->wdata = status; 735 status = 0; 736 } 737 } else { 738 status = i2c_smbus_write_word_data(client, command, 739 gsb->wdata); 740 } 741 break; 742 743 case ACPI_GSB_ACCESS_ATTRIB_BLOCK: 744 if (action == ACPI_READ) { 745 status = i2c_smbus_read_block_data(client, command, 746 gsb->data); 747 if (status >= 0) { 748 gsb->len = status; 749 status = 0; 750 } 751 } else { 752 status = i2c_smbus_write_block_data(client, command, 753 gsb->len, gsb->data); 754 } 755 break; 756 757 case ACPI_GSB_ACCESS_ATTRIB_MULTIBYTE: 758 if (action == ACPI_READ) { 759 status = acpi_gsb_i2c_read_bytes(client, command, 760 gsb->data, info->access_length); 761 } else { 762 status = acpi_gsb_i2c_write_bytes(client, command, 763 gsb->data, info->access_length); 764 } 765 break; 766 767 default: 768 dev_warn(&adapter->dev, "protocol 0x%02x not supported for client 0x%02x\n", 769 accessor_type, client->addr); 770 ret = AE_BAD_PARAMETER; 771 goto err; 772 } 773 774 gsb->status = status; 775 776 err: 777 kfree(client); 778 ACPI_FREE(ares); 779 return ret; 780 } 781 782 783 int i2c_acpi_install_space_handler(struct i2c_adapter *adapter) 784 { 785 acpi_handle handle; 786 struct i2c_acpi_handler_data *data; 787 acpi_status status; 788 789 if (!adapter->dev.parent) 790 return -ENODEV; 791 792 handle = ACPI_HANDLE(adapter->dev.parent); 793 794 if (!handle) 795 return -ENODEV; 796 797 data = kzalloc_obj(struct i2c_acpi_handler_data); 798 if (!data) 799 return -ENOMEM; 800 801 data->adapter = adapter; 802 status = acpi_bus_attach_private_data(handle, (void *)data); 803 if (ACPI_FAILURE(status)) { 804 kfree(data); 805 return -ENOMEM; 806 } 807 808 status = acpi_install_address_space_handler(handle, 809 ACPI_ADR_SPACE_GSBUS, 810 &i2c_acpi_space_handler, 811 NULL, 812 data); 813 if (ACPI_FAILURE(status)) { 814 dev_err(&adapter->dev, "Error installing i2c space handler\n"); 815 acpi_bus_detach_private_data(handle); 816 kfree(data); 817 return -ENOMEM; 818 } 819 820 return 0; 821 } 822 823 void i2c_acpi_remove_space_handler(struct i2c_adapter *adapter) 824 { 825 acpi_handle handle; 826 struct i2c_acpi_handler_data *data; 827 acpi_status status; 828 829 if (!adapter->dev.parent) 830 return; 831 832 handle = ACPI_HANDLE(adapter->dev.parent); 833 834 if (!handle) 835 return; 836 837 acpi_remove_address_space_handler(handle, 838 ACPI_ADR_SPACE_GSBUS, 839 &i2c_acpi_space_handler); 840 841 status = acpi_bus_get_private_data(handle, (void **)&data); 842 if (ACPI_SUCCESS(status)) 843 kfree(data); 844 845 acpi_bus_detach_private_data(handle); 846 } 847 #endif /* CONFIG_ACPI_I2C_OPREGION */ 848