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 static const struct acpi_device_id i2c_acpi_ignored_device_ids[] = { 135 /* 136 * ACPI video acpi_devices, which are handled by the acpi-video driver 137 * sometimes contain a SERIAL_TYPE_I2C ACPI resource, ignore these. 138 */ 139 { ACPI_VIDEO_HID, 0 }, 140 {} 141 }; 142 143 struct i2c_acpi_irq_context { 144 int irq; 145 bool wake_capable; 146 }; 147 148 static int i2c_acpi_do_lookup(struct acpi_device *adev, 149 struct i2c_acpi_lookup *lookup) 150 { 151 struct i2c_board_info *info = lookup->info; 152 struct list_head resource_list; 153 int ret; 154 155 if (acpi_bus_get_status(adev)) 156 return -EINVAL; 157 158 if (!acpi_dev_ready_for_enumeration(adev)) 159 return -ENODEV; 160 161 if (acpi_match_device_ids(adev, i2c_acpi_ignored_device_ids) == 0) 162 return -ENODEV; 163 164 memset(info, 0, sizeof(*info)); 165 lookup->device_handle = acpi_device_handle(adev); 166 167 /* Look up for I2cSerialBus resource */ 168 INIT_LIST_HEAD(&resource_list); 169 ret = acpi_dev_get_resources(adev, &resource_list, 170 i2c_acpi_fill_info, lookup); 171 acpi_dev_free_resource_list(&resource_list); 172 173 if (ret < 0 || !info->addr) 174 return -EINVAL; 175 176 return 0; 177 } 178 179 static int i2c_acpi_add_irq_resource(struct acpi_resource *ares, void *data) 180 { 181 struct i2c_acpi_irq_context *irq_ctx = data; 182 struct resource r; 183 184 if (irq_ctx->irq > 0) 185 return 1; 186 187 if (!acpi_dev_resource_interrupt(ares, 0, &r)) 188 return 1; 189 190 irq_ctx->irq = i2c_dev_irq_from_resources(&r, 1); 191 irq_ctx->wake_capable = r.flags & IORESOURCE_IRQ_WAKECAPABLE; 192 193 return 1; /* No need to add resource to the list */ 194 } 195 196 /** 197 * i2c_acpi_get_irq - get device IRQ number from ACPI 198 * @client: Pointer to the I2C client device 199 * @wake_capable: Set to true if the IRQ is wake capable 200 * 201 * Find the IRQ number used by a specific client device. 202 * 203 * Return: The IRQ number or an error code. 204 */ 205 int i2c_acpi_get_irq(struct i2c_client *client, bool *wake_capable) 206 { 207 struct acpi_device *adev = ACPI_COMPANION(&client->dev); 208 struct list_head resource_list; 209 struct i2c_acpi_irq_context irq_ctx = { 210 .irq = -ENOENT, 211 }; 212 int ret; 213 214 INIT_LIST_HEAD(&resource_list); 215 216 ret = acpi_dev_get_resources(adev, &resource_list, 217 i2c_acpi_add_irq_resource, &irq_ctx); 218 if (ret < 0) 219 return ret; 220 221 acpi_dev_free_resource_list(&resource_list); 222 223 if (irq_ctx.irq == -ENOENT) 224 irq_ctx.irq = acpi_dev_gpio_irq_wake_get(adev, 0, &irq_ctx.wake_capable); 225 226 if (irq_ctx.irq < 0) 227 return irq_ctx.irq; 228 229 if (wake_capable) 230 *wake_capable = irq_ctx.wake_capable; 231 232 return irq_ctx.irq; 233 } 234 235 static int i2c_acpi_get_info(struct acpi_device *adev, 236 struct i2c_board_info *info, 237 struct i2c_adapter *adapter, 238 acpi_handle *adapter_handle) 239 { 240 struct i2c_acpi_lookup lookup; 241 int ret; 242 243 memset(&lookup, 0, sizeof(lookup)); 244 lookup.info = info; 245 lookup.index = -1; 246 247 if (acpi_device_enumerated(adev)) 248 return -EINVAL; 249 250 ret = i2c_acpi_do_lookup(adev, &lookup); 251 if (ret) 252 return ret; 253 254 if (adapter) { 255 /* The adapter must match the one in I2cSerialBus() connector */ 256 if (!device_match_acpi_handle(&adapter->dev, lookup.adapter_handle)) 257 return -ENODEV; 258 } else { 259 struct acpi_device *adapter_adev; 260 261 /* The adapter must be present */ 262 adapter_adev = acpi_fetch_acpi_dev(lookup.adapter_handle); 263 if (!adapter_adev) 264 return -ENODEV; 265 if (acpi_bus_get_status(adapter_adev) || 266 !adapter_adev->status.present) 267 return -ENODEV; 268 } 269 270 info->fwnode = acpi_fwnode_handle(adev); 271 if (adapter_handle) 272 *adapter_handle = lookup.adapter_handle; 273 274 acpi_set_modalias(adev, dev_name(&adev->dev), info->type, 275 sizeof(info->type)); 276 277 return 0; 278 } 279 280 static void i2c_acpi_register_device(struct i2c_adapter *adapter, 281 struct acpi_device *adev, 282 struct i2c_board_info *info) 283 { 284 /* 285 * Skip registration on boards where the ACPI tables are 286 * known to contain bogus I2C devices. 287 */ 288 if (acpi_quirk_skip_i2c_client_enumeration(adev)) 289 return; 290 291 adev->power.flags.ignore_parent = true; 292 acpi_device_set_enumerated(adev); 293 294 if (IS_ERR(i2c_new_client_device(adapter, info))) 295 adev->power.flags.ignore_parent = false; 296 } 297 298 static acpi_status i2c_acpi_add_device(acpi_handle handle, u32 level, 299 void *data, void **return_value) 300 { 301 struct i2c_adapter *adapter = data; 302 struct acpi_device *adev = acpi_fetch_acpi_dev(handle); 303 struct i2c_board_info info; 304 305 if (!adev || i2c_acpi_get_info(adev, &info, adapter, NULL)) 306 return AE_OK; 307 308 i2c_acpi_register_device(adapter, adev, &info); 309 310 return AE_OK; 311 } 312 313 #define I2C_ACPI_MAX_SCAN_DEPTH 32 314 315 /** 316 * i2c_acpi_register_devices - enumerate I2C slave devices behind adapter 317 * @adap: pointer to adapter 318 * 319 * Enumerate all I2C slave devices behind this adapter by walking the ACPI 320 * namespace. When a device is found it will be added to the Linux device 321 * model and bound to the corresponding ACPI handle. 322 */ 323 void i2c_acpi_register_devices(struct i2c_adapter *adap) 324 { 325 struct acpi_device *adev; 326 acpi_status status; 327 328 if (!has_acpi_companion(&adap->dev)) 329 return; 330 331 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, 332 I2C_ACPI_MAX_SCAN_DEPTH, 333 i2c_acpi_add_device, NULL, 334 adap, NULL); 335 if (ACPI_FAILURE(status)) 336 dev_warn(&adap->dev, "failed to enumerate I2C slaves\n"); 337 338 if (!adap->dev.parent) 339 return; 340 341 adev = ACPI_COMPANION(adap->dev.parent); 342 if (!adev) 343 return; 344 345 acpi_dev_clear_dependencies(adev); 346 } 347 348 static const struct acpi_device_id i2c_acpi_force_400khz_device_ids[] = { 349 /* 350 * These Silead touchscreen controllers only work at 400KHz, for 351 * some reason they do not work at 100KHz. On some devices the ACPI 352 * tables list another device at their bus as only being capable 353 * of 100KHz, testing has shown that these other devices work fine 354 * at 400KHz (as can be expected of any recent i2c hw) so we force 355 * the speed of the bus to 400 KHz if a Silead device is present. 356 */ 357 { "MSSL1680", 0 }, 358 {} 359 }; 360 361 static const struct acpi_device_id i2c_acpi_force_100khz_device_ids[] = { 362 /* 363 * When a 400KHz freq is used on this model of ELAN touchpad in Linux, 364 * excessive smoothing (similar to when the touchpad's firmware detects 365 * a noisy signal) is sometimes applied. As some devices' (e.g, Lenovo 366 * V15 G4) ACPI tables specify a 400KHz frequency for this device and 367 * some I2C busses (e.g, Designware I2C) default to a 400KHz freq, 368 * force the speed to 100KHz as a workaround. 369 * 370 * For future investigation: This problem may be related to the default 371 * HCNT/LCNT values given by some busses' drivers, because they are not 372 * specified in the aforementioned devices' ACPI tables, and because 373 * the device works without issues on Windows at what is expected to be 374 * a 400KHz frequency. The root cause of the issue is not known. 375 */ 376 { "DLL0945", 0 }, 377 { "ELAN0678", 0 }, 378 { "ELAN06FA", 0 }, 379 {} 380 }; 381 382 static acpi_status i2c_acpi_lookup_speed(acpi_handle handle, u32 level, 383 void *data, void **return_value) 384 { 385 struct i2c_acpi_lookup *lookup = data; 386 struct acpi_device *adev = acpi_fetch_acpi_dev(handle); 387 388 if (!adev || i2c_acpi_do_lookup(adev, lookup)) 389 return AE_OK; 390 391 if (lookup->search_handle != lookup->adapter_handle) 392 return AE_OK; 393 394 if (lookup->speed <= lookup->min_speed) 395 lookup->min_speed = lookup->speed; 396 397 if (acpi_match_device_ids(adev, i2c_acpi_force_400khz_device_ids) == 0) 398 lookup->force_speed = I2C_MAX_FAST_MODE_FREQ; 399 400 if (acpi_match_device_ids(adev, i2c_acpi_force_100khz_device_ids) == 0) 401 lookup->force_speed = I2C_MAX_STANDARD_MODE_FREQ; 402 403 return AE_OK; 404 } 405 406 /** 407 * i2c_acpi_find_bus_speed - find I2C bus speed from ACPI 408 * @dev: The device owning the bus 409 * 410 * Find the I2C bus speed by walking the ACPI namespace for all I2C slaves 411 * devices connected to this bus and use the speed of slowest device. 412 * 413 * Returns the speed in Hz or zero 414 */ 415 u32 i2c_acpi_find_bus_speed(struct device *dev) 416 { 417 struct i2c_acpi_lookup lookup; 418 struct i2c_board_info dummy; 419 acpi_status status; 420 421 if (!has_acpi_companion(dev)) 422 return 0; 423 424 memset(&lookup, 0, sizeof(lookup)); 425 lookup.search_handle = ACPI_HANDLE(dev); 426 lookup.min_speed = UINT_MAX; 427 lookup.info = &dummy; 428 lookup.index = -1; 429 430 status = acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, 431 I2C_ACPI_MAX_SCAN_DEPTH, 432 i2c_acpi_lookup_speed, NULL, 433 &lookup, NULL); 434 435 if (ACPI_FAILURE(status)) { 436 dev_warn(dev, "unable to find I2C bus speed from ACPI\n"); 437 return 0; 438 } 439 440 if (lookup.force_speed) { 441 if (lookup.force_speed != lookup.min_speed) 442 dev_warn(dev, FW_BUG "DSDT uses known not-working I2C bus speed %d, forcing it to %d\n", 443 lookup.min_speed, lookup.force_speed); 444 return lookup.force_speed; 445 } else if (lookup.min_speed != UINT_MAX) { 446 return lookup.min_speed; 447 } else { 448 return 0; 449 } 450 } 451 EXPORT_SYMBOL_GPL(i2c_acpi_find_bus_speed); 452 453 struct i2c_adapter *i2c_acpi_find_adapter_by_handle(acpi_handle handle) 454 { 455 struct i2c_adapter *adapter; 456 struct device *dev; 457 458 dev = bus_find_device(&i2c_bus_type, NULL, handle, device_match_acpi_handle); 459 if (!dev) 460 return NULL; 461 462 adapter = i2c_verify_adapter(dev); 463 if (!adapter) 464 put_device(dev); 465 466 return adapter; 467 } 468 EXPORT_SYMBOL_GPL(i2c_acpi_find_adapter_by_handle); 469 470 static struct i2c_client *i2c_acpi_find_client_by_adev(struct acpi_device *adev) 471 { 472 return i2c_find_device_by_fwnode(acpi_fwnode_handle(adev)); 473 } 474 475 static struct i2c_adapter *i2c_acpi_find_adapter_by_adev(struct acpi_device *adev) 476 { 477 return i2c_find_adapter_by_fwnode(acpi_fwnode_handle(adev)); 478 } 479 480 static int i2c_acpi_notify(struct notifier_block *nb, unsigned long value, 481 void *arg) 482 { 483 struct acpi_device *adev = arg; 484 struct i2c_board_info info; 485 acpi_handle adapter_handle; 486 struct i2c_adapter *adapter; 487 struct i2c_client *client; 488 489 switch (value) { 490 case ACPI_RECONFIG_DEVICE_ADD: 491 if (i2c_acpi_get_info(adev, &info, NULL, &adapter_handle)) 492 break; 493 494 adapter = i2c_acpi_find_adapter_by_handle(adapter_handle); 495 if (!adapter) 496 break; 497 498 i2c_acpi_register_device(adapter, adev, &info); 499 put_device(&adapter->dev); 500 break; 501 case ACPI_RECONFIG_DEVICE_REMOVE: 502 if (!acpi_device_enumerated(adev)) 503 break; 504 505 client = i2c_acpi_find_client_by_adev(adev); 506 if (client) { 507 i2c_unregister_device(client); 508 put_device(&client->dev); 509 } 510 511 adapter = i2c_acpi_find_adapter_by_adev(adev); 512 if (adapter) { 513 acpi_unbind_one(&adapter->dev); 514 put_device(&adapter->dev); 515 } 516 517 break; 518 } 519 520 return NOTIFY_OK; 521 } 522 523 struct notifier_block i2c_acpi_notifier = { 524 .notifier_call = i2c_acpi_notify, 525 }; 526 527 /** 528 * i2c_acpi_new_device_by_fwnode - Create i2c-client for the Nth I2cSerialBus resource 529 * @fwnode: fwnode with the ACPI resources to get the client from 530 * @index: Index of ACPI resource to get 531 * @info: describes the I2C device; note this is modified (addr gets set) 532 * Context: can sleep 533 * 534 * By default the i2c subsys creates an i2c-client for the first I2cSerialBus 535 * resource of an acpi_device, but some acpi_devices have multiple I2cSerialBus 536 * resources, in that case this function can be used to create an i2c-client 537 * for other I2cSerialBus resources in the Current Resource Settings table. 538 * 539 * Also see i2c_new_client_device, which this function calls to create the 540 * i2c-client. 541 * 542 * Returns a pointer to the new i2c-client, or error pointer in case of failure. 543 * Specifically, -EPROBE_DEFER is returned if the adapter is not found. 544 */ 545 struct i2c_client *i2c_acpi_new_device_by_fwnode(struct fwnode_handle *fwnode, 546 int index, 547 struct i2c_board_info *info) 548 { 549 struct i2c_acpi_lookup lookup; 550 struct i2c_adapter *adapter; 551 struct acpi_device *adev; 552 LIST_HEAD(resource_list); 553 int ret; 554 555 adev = to_acpi_device_node(fwnode); 556 if (!adev) 557 return ERR_PTR(-ENODEV); 558 559 memset(&lookup, 0, sizeof(lookup)); 560 lookup.info = info; 561 lookup.device_handle = acpi_device_handle(adev); 562 lookup.index = index; 563 564 ret = acpi_dev_get_resources(adev, &resource_list, 565 i2c_acpi_fill_info, &lookup); 566 if (ret < 0) 567 return ERR_PTR(ret); 568 569 acpi_dev_free_resource_list(&resource_list); 570 571 if (!info->addr) 572 return ERR_PTR(-EADDRNOTAVAIL); 573 574 adapter = i2c_acpi_find_adapter_by_handle(lookup.adapter_handle); 575 if (!adapter) 576 return ERR_PTR(-EPROBE_DEFER); 577 578 return i2c_new_client_device(adapter, info); 579 } 580 EXPORT_SYMBOL_GPL(i2c_acpi_new_device_by_fwnode); 581 582 bool i2c_acpi_waive_d0_probe(struct device *dev) 583 { 584 struct i2c_driver *driver = to_i2c_driver(dev->driver); 585 struct acpi_device *adev = ACPI_COMPANION(dev); 586 587 return driver->flags & I2C_DRV_ACPI_WAIVE_D0_PROBE && 588 adev && adev->power.state_for_enumeration >= adev->power.state; 589 } 590 EXPORT_SYMBOL_GPL(i2c_acpi_waive_d0_probe); 591 592 #ifdef CONFIG_ACPI_I2C_OPREGION 593 static int acpi_gsb_i2c_read_bytes(struct i2c_client *client, 594 u8 cmd, u8 *data, u8 data_len) 595 { 596 597 struct i2c_msg msgs[2]; 598 int ret; 599 u8 *buffer; 600 601 buffer = kzalloc(data_len, GFP_KERNEL); 602 if (!buffer) 603 return AE_NO_MEMORY; 604 605 msgs[0].addr = client->addr; 606 msgs[0].flags = client->flags; 607 msgs[0].len = 1; 608 msgs[0].buf = &cmd; 609 610 msgs[1].addr = client->addr; 611 msgs[1].flags = client->flags | I2C_M_RD; 612 msgs[1].len = data_len; 613 msgs[1].buf = buffer; 614 615 ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs)); 616 if (ret < 0) { 617 /* Getting a NACK is unfortunately normal with some DSTDs */ 618 if (ret == -EREMOTEIO) 619 dev_dbg(&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 else 622 dev_err(&client->adapter->dev, "i2c read %d bytes from client@%#x starting at reg %#x failed, error: %d\n", 623 data_len, client->addr, cmd, ret); 624 /* 2 transfers must have completed successfully */ 625 } else if (ret == 2) { 626 memcpy(data, buffer, data_len); 627 ret = 0; 628 } else { 629 ret = -EIO; 630 } 631 632 kfree(buffer); 633 return ret; 634 } 635 636 static int acpi_gsb_i2c_write_bytes(struct i2c_client *client, 637 u8 cmd, u8 *data, u8 data_len) 638 { 639 640 struct i2c_msg msgs[1]; 641 u8 *buffer; 642 int ret = AE_OK; 643 644 buffer = kzalloc(data_len + 1, GFP_KERNEL); 645 if (!buffer) 646 return AE_NO_MEMORY; 647 648 buffer[0] = cmd; 649 memcpy(buffer + 1, data, data_len); 650 651 msgs[0].addr = client->addr; 652 msgs[0].flags = client->flags; 653 msgs[0].len = data_len + 1; 654 msgs[0].buf = buffer; 655 656 ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs)); 657 658 kfree(buffer); 659 660 if (ret < 0) { 661 dev_err(&client->adapter->dev, "i2c write failed: %d\n", ret); 662 return ret; 663 } 664 665 /* 1 transfer must have completed successfully */ 666 return (ret == 1) ? 0 : -EIO; 667 } 668 669 static acpi_status 670 i2c_acpi_space_handler(u32 function, acpi_physical_address command, 671 u32 bits, u64 *value64, 672 void *handler_context, void *region_context) 673 { 674 struct gsb_buffer *gsb = (struct gsb_buffer *)value64; 675 struct i2c_acpi_handler_data *data = handler_context; 676 struct acpi_connection_info *info = &data->info; 677 struct acpi_resource_i2c_serialbus *sb; 678 struct i2c_adapter *adapter = data->adapter; 679 struct i2c_client *client; 680 struct acpi_resource *ares; 681 u32 accessor_type = function >> 16; 682 u8 action = function & ACPI_IO_MASK; 683 acpi_status ret; 684 int status; 685 686 ret = acpi_buffer_to_resource(info->connection, info->length, &ares); 687 if (ACPI_FAILURE(ret)) 688 return ret; 689 690 client = kzalloc_obj(*client); 691 if (!client) { 692 ret = AE_NO_MEMORY; 693 goto err; 694 } 695 696 if (!value64 || !i2c_acpi_get_i2c_resource(ares, &sb)) { 697 ret = AE_BAD_PARAMETER; 698 goto err; 699 } 700 701 client->adapter = adapter; 702 client->addr = sb->slave_address; 703 704 if (sb->access_mode == ACPI_I2C_10BIT_MODE) 705 client->flags |= I2C_CLIENT_TEN; 706 707 switch (accessor_type) { 708 case ACPI_GSB_ACCESS_ATTRIB_SEND_RCV: 709 if (action == ACPI_READ) { 710 status = i2c_smbus_read_byte(client); 711 if (status >= 0) { 712 gsb->bdata = status; 713 status = 0; 714 } 715 } else { 716 status = i2c_smbus_write_byte(client, gsb->bdata); 717 } 718 break; 719 720 case ACPI_GSB_ACCESS_ATTRIB_BYTE: 721 if (action == ACPI_READ) { 722 status = i2c_smbus_read_byte_data(client, command); 723 if (status >= 0) { 724 gsb->bdata = status; 725 status = 0; 726 } 727 } else { 728 status = i2c_smbus_write_byte_data(client, command, 729 gsb->bdata); 730 } 731 break; 732 733 case ACPI_GSB_ACCESS_ATTRIB_WORD: 734 if (action == ACPI_READ) { 735 status = i2c_smbus_read_word_data(client, command); 736 if (status >= 0) { 737 gsb->wdata = status; 738 status = 0; 739 } 740 } else { 741 status = i2c_smbus_write_word_data(client, command, 742 gsb->wdata); 743 } 744 break; 745 746 case ACPI_GSB_ACCESS_ATTRIB_BLOCK: 747 if (action == ACPI_READ) { 748 status = i2c_smbus_read_block_data(client, command, 749 gsb->data); 750 if (status >= 0) { 751 gsb->len = status; 752 status = 0; 753 } 754 } else { 755 status = i2c_smbus_write_block_data(client, command, 756 gsb->len, gsb->data); 757 } 758 break; 759 760 case ACPI_GSB_ACCESS_ATTRIB_MULTIBYTE: 761 if (action == ACPI_READ) { 762 status = acpi_gsb_i2c_read_bytes(client, command, 763 gsb->data, info->access_length); 764 } else { 765 status = acpi_gsb_i2c_write_bytes(client, command, 766 gsb->data, info->access_length); 767 } 768 break; 769 770 default: 771 dev_warn(&adapter->dev, "protocol 0x%02x not supported for client 0x%02x\n", 772 accessor_type, client->addr); 773 ret = AE_BAD_PARAMETER; 774 goto err; 775 } 776 777 gsb->status = status; 778 779 err: 780 kfree(client); 781 ACPI_FREE(ares); 782 return ret; 783 } 784 785 786 int i2c_acpi_install_space_handler(struct i2c_adapter *adapter) 787 { 788 acpi_handle handle; 789 struct i2c_acpi_handler_data *data; 790 acpi_status status; 791 792 if (!adapter->dev.parent) 793 return -ENODEV; 794 795 handle = ACPI_HANDLE(adapter->dev.parent); 796 797 if (!handle) 798 return -ENODEV; 799 800 data = kzalloc_obj(struct i2c_acpi_handler_data); 801 if (!data) 802 return -ENOMEM; 803 804 data->adapter = adapter; 805 status = acpi_bus_attach_private_data(handle, (void *)data); 806 if (ACPI_FAILURE(status)) { 807 kfree(data); 808 return -ENOMEM; 809 } 810 811 status = acpi_install_address_space_handler(handle, 812 ACPI_ADR_SPACE_GSBUS, 813 &i2c_acpi_space_handler, 814 NULL, 815 data); 816 if (ACPI_FAILURE(status)) { 817 dev_err(&adapter->dev, "Error installing i2c space handler\n"); 818 acpi_bus_detach_private_data(handle); 819 kfree(data); 820 return -ENOMEM; 821 } 822 823 return 0; 824 } 825 826 void i2c_acpi_remove_space_handler(struct i2c_adapter *adapter) 827 { 828 acpi_handle handle; 829 struct i2c_acpi_handler_data *data; 830 acpi_status status; 831 832 if (!adapter->dev.parent) 833 return; 834 835 handle = ACPI_HANDLE(adapter->dev.parent); 836 837 if (!handle) 838 return; 839 840 acpi_remove_address_space_handler(handle, 841 ACPI_ADR_SPACE_GSBUS, 842 &i2c_acpi_space_handler); 843 844 status = acpi_bus_get_private_data(handle, (void **)&data); 845 if (ACPI_SUCCESS(status)) 846 kfree(data); 847 848 acpi_bus_detach_private_data(handle); 849 } 850 #endif /* CONFIG_ACPI_I2C_OPREGION */ 851