1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * INT3400 thermal driver 4 * 5 * Copyright (C) 2014, Intel Corporation 6 * Authors: Zhang Rui <rui.zhang@intel.com> 7 */ 8 9 #include <linux/module.h> 10 #include <linux/platform_device.h> 11 #include <linux/acpi.h> 12 #include <linux/thermal.h> 13 #include "acpi_thermal_rel.h" 14 15 #define INT3400_THERMAL_TABLE_CHANGED 0x83 16 #define INT3400_ODVP_CHANGED 0x88 17 #define INT3400_KEEP_ALIVE 0xA0 18 #define INT3400_FAKE_TEMP (20 * 1000) /* faked temp sensor with 20C */ 19 20 enum int3400_thermal_uuid { 21 INT3400_THERMAL_ACTIVE = 0, 22 INT3400_THERMAL_PASSIVE_1, 23 INT3400_THERMAL_CRITICAL, 24 INT3400_THERMAL_ADAPTIVE_PERFORMANCE, 25 INT3400_THERMAL_EMERGENCY_CALL_MODE, 26 INT3400_THERMAL_PASSIVE_2, 27 INT3400_THERMAL_POWER_BOSS, 28 INT3400_THERMAL_VIRTUAL_SENSOR, 29 INT3400_THERMAL_COOLING_MODE, 30 INT3400_THERMAL_HARDWARE_DUTY_CYCLING, 31 INT3400_THERMAL_MAXIMUM_UUID, 32 }; 33 34 static char *int3400_thermal_uuids[INT3400_THERMAL_MAXIMUM_UUID] = { 35 "3A95C389-E4B8-4629-A526-C52C88626BAE", 36 "42A441D6-AE6A-462b-A84B-4A8CE79027D3", 37 "97C68AE7-15FA-499c-B8C9-5DA81D606E0A", 38 "63BE270F-1C11-48FD-A6F7-3AF253FF3E2D", 39 "5349962F-71E6-431D-9AE8-0A635B710AEE", 40 "9E04115A-AE87-4D1C-9500-0F3E340BFE75", 41 "F5A35014-C209-46A4-993A-EB56DE7530A1", 42 "6ED722A7-9240-48A5-B479-31EEF723D7CF", 43 "16CAF1B7-DD38-40ED-B1C1-1B8A1913D531", 44 "BE84BABF-C4D4-403D-B495-3128FD44dAC1", 45 }; 46 47 struct odvp_attr; 48 49 struct int3400_thermal_priv { 50 struct acpi_device *adev; 51 struct platform_device *pdev; 52 struct thermal_zone_device *thermal; 53 int art_count; 54 struct art *arts; 55 int trt_count; 56 struct trt *trts; 57 u32 uuid_bitmap; 58 int rel_misc_dev_res; 59 int current_uuid_index; 60 char *data_vault; 61 int odvp_count; 62 int *odvp; 63 u32 os_uuid_mask; 64 int production_mode; 65 struct odvp_attr *odvp_attrs; 66 }; 67 68 static int evaluate_odvp(struct int3400_thermal_priv *priv); 69 70 struct odvp_attr { 71 int odvp; 72 struct int3400_thermal_priv *priv; 73 struct device_attribute attr; 74 }; 75 76 static BIN_ATTR_SIMPLE_RO(data_vault); 77 78 static struct bin_attribute *data_attributes[] = { 79 &bin_attr_data_vault, 80 NULL, 81 }; 82 83 static ssize_t imok_store(struct device *dev, struct device_attribute *attr, 84 const char *buf, size_t count) 85 { 86 struct int3400_thermal_priv *priv = dev_get_drvdata(dev); 87 acpi_status status; 88 int input, ret; 89 90 ret = kstrtouint(buf, 10, &input); 91 if (ret) 92 return ret; 93 status = acpi_execute_simple_method(priv->adev->handle, "IMOK", input); 94 if (ACPI_FAILURE(status)) 95 return -EIO; 96 97 return count; 98 } 99 100 static DEVICE_ATTR_WO(imok); 101 102 static struct attribute *imok_attr[] = { 103 &dev_attr_imok.attr, 104 NULL 105 }; 106 107 static const struct attribute_group imok_attribute_group = { 108 .attrs = imok_attr, 109 }; 110 111 static const struct attribute_group data_attribute_group = { 112 .bin_attrs = data_attributes, 113 }; 114 115 static ssize_t available_uuids_show(struct device *dev, 116 struct device_attribute *attr, 117 char *buf) 118 { 119 struct int3400_thermal_priv *priv = dev_get_drvdata(dev); 120 int i; 121 int length = 0; 122 123 if (!priv->uuid_bitmap) 124 return sprintf(buf, "UNKNOWN\n"); 125 126 for (i = 0; i < INT3400_THERMAL_MAXIMUM_UUID; i++) { 127 if (priv->uuid_bitmap & (1 << i)) 128 length += sysfs_emit_at(buf, length, "%s\n", int3400_thermal_uuids[i]); 129 } 130 131 return length; 132 } 133 134 static ssize_t current_uuid_show(struct device *dev, 135 struct device_attribute *devattr, char *buf) 136 { 137 struct int3400_thermal_priv *priv = dev_get_drvdata(dev); 138 int i, length = 0; 139 140 if (priv->current_uuid_index > 0) 141 return sprintf(buf, "%s\n", 142 int3400_thermal_uuids[priv->current_uuid_index]); 143 144 for (i = 0; i <= INT3400_THERMAL_CRITICAL; i++) { 145 if (priv->os_uuid_mask & BIT(i)) 146 length += sysfs_emit_at(buf, length, "%s\n", int3400_thermal_uuids[i]); 147 } 148 149 if (length) 150 return length; 151 152 return sprintf(buf, "INVALID\n"); 153 } 154 155 static int int3400_thermal_run_osc(acpi_handle handle, char *uuid_str, int *enable) 156 { 157 u32 ret, buf[2]; 158 acpi_status status; 159 int result = 0; 160 struct acpi_osc_context context = { 161 .uuid_str = uuid_str, 162 .rev = 1, 163 .cap.length = 8, 164 .cap.pointer = buf, 165 }; 166 167 buf[OSC_QUERY_DWORD] = 0; 168 buf[OSC_SUPPORT_DWORD] = *enable; 169 170 status = acpi_run_osc(handle, &context); 171 if (ACPI_SUCCESS(status)) { 172 ret = *((u32 *)(context.ret.pointer + 4)); 173 if (ret != *enable) 174 result = -EPERM; 175 176 kfree(context.ret.pointer); 177 } else 178 result = -EPERM; 179 180 return result; 181 } 182 183 static int set_os_uuid_mask(struct int3400_thermal_priv *priv, u32 mask) 184 { 185 int cap = 0; 186 187 /* 188 * Capability bits: 189 * Bit 0: set to 1 to indicate DPTF is active 190 * Bi1 1: set to 1 to active cooling is supported by user space daemon 191 * Bit 2: set to 1 to passive cooling is supported by user space daemon 192 * Bit 3: set to 1 to critical trip is handled by user space daemon 193 */ 194 if (mask) 195 cap = (priv->os_uuid_mask << 1) | 0x01; 196 197 return int3400_thermal_run_osc(priv->adev->handle, 198 "b23ba85d-c8b7-3542-88de-8de2ffcfd698", 199 &cap); 200 } 201 202 static ssize_t current_uuid_store(struct device *dev, 203 struct device_attribute *attr, 204 const char *buf, size_t count) 205 { 206 struct int3400_thermal_priv *priv = dev_get_drvdata(dev); 207 int ret, i; 208 209 for (i = 0; i < INT3400_THERMAL_MAXIMUM_UUID; ++i) { 210 if (!strncmp(buf, int3400_thermal_uuids[i], 211 sizeof(int3400_thermal_uuids[i]) - 1)) { 212 /* 213 * If we have a list of supported UUIDs, make sure 214 * this one is supported. 215 */ 216 if (priv->uuid_bitmap & BIT(i)) { 217 priv->current_uuid_index = i; 218 return count; 219 } 220 221 /* 222 * There is support of only 3 policies via the new 223 * _OSC to inform OS capability: 224 * INT3400_THERMAL_ACTIVE 225 * INT3400_THERMAL_PASSIVE_1 226 * INT3400_THERMAL_CRITICAL 227 */ 228 229 if (i > INT3400_THERMAL_CRITICAL) 230 return -EINVAL; 231 232 priv->os_uuid_mask |= BIT(i); 233 234 break; 235 } 236 } 237 238 if (priv->os_uuid_mask) { 239 ret = set_os_uuid_mask(priv, priv->os_uuid_mask); 240 if (ret) 241 return ret; 242 } 243 244 return count; 245 } 246 247 static DEVICE_ATTR_RW(current_uuid); 248 static DEVICE_ATTR_RO(available_uuids); 249 static struct attribute *uuid_attrs[] = { 250 &dev_attr_available_uuids.attr, 251 &dev_attr_current_uuid.attr, 252 NULL 253 }; 254 255 static const struct attribute_group uuid_attribute_group = { 256 .attrs = uuid_attrs, 257 .name = "uuids" 258 }; 259 260 static int int3400_thermal_get_uuids(struct int3400_thermal_priv *priv) 261 { 262 struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER, NULL}; 263 union acpi_object *obja, *objb; 264 int i, j; 265 int result = 0; 266 acpi_status status; 267 268 status = acpi_evaluate_object(priv->adev->handle, "IDSP", NULL, &buf); 269 if (ACPI_FAILURE(status)) 270 return -ENODEV; 271 272 obja = (union acpi_object *)buf.pointer; 273 if (obja->type != ACPI_TYPE_PACKAGE) { 274 result = -EINVAL; 275 goto end; 276 } 277 278 for (i = 0; i < obja->package.count; i++) { 279 objb = &obja->package.elements[i]; 280 if (objb->type != ACPI_TYPE_BUFFER) { 281 result = -EINVAL; 282 goto end; 283 } 284 285 /* UUID must be 16 bytes */ 286 if (objb->buffer.length != 16) { 287 result = -EINVAL; 288 goto end; 289 } 290 291 for (j = 0; j < INT3400_THERMAL_MAXIMUM_UUID; j++) { 292 guid_t guid; 293 294 guid_parse(int3400_thermal_uuids[j], &guid); 295 if (guid_equal((guid_t *)objb->buffer.pointer, &guid)) { 296 priv->uuid_bitmap |= (1 << j); 297 break; 298 } 299 } 300 } 301 302 end: 303 kfree(buf.pointer); 304 return result; 305 } 306 307 static ssize_t production_mode_show(struct device *dev, struct device_attribute *attr, 308 char *buf) 309 { 310 struct int3400_thermal_priv *priv = dev_get_drvdata(dev); 311 312 return sysfs_emit(buf, "%d\n", priv->production_mode); 313 } 314 315 static DEVICE_ATTR_RO(production_mode); 316 317 static int production_mode_init(struct int3400_thermal_priv *priv) 318 { 319 unsigned long long mode; 320 acpi_status status; 321 int ret; 322 323 priv->production_mode = -1; 324 325 status = acpi_evaluate_integer(priv->adev->handle, "DCFG", NULL, &mode); 326 /* If the method is not present, this is not an error */ 327 if (ACPI_FAILURE(status)) 328 return 0; 329 330 ret = sysfs_create_file(&priv->pdev->dev.kobj, &dev_attr_production_mode.attr); 331 if (ret) 332 return ret; 333 334 priv->production_mode = mode; 335 336 return 0; 337 } 338 339 static void production_mode_exit(struct int3400_thermal_priv *priv) 340 { 341 if (priv->production_mode >= 0) 342 sysfs_remove_file(&priv->pdev->dev.kobj, &dev_attr_production_mode.attr); 343 } 344 345 static ssize_t odvp_show(struct device *dev, struct device_attribute *attr, 346 char *buf) 347 { 348 struct odvp_attr *odvp_attr; 349 350 odvp_attr = container_of(attr, struct odvp_attr, attr); 351 352 return sprintf(buf, "%d\n", odvp_attr->priv->odvp[odvp_attr->odvp]); 353 } 354 355 static void cleanup_odvp(struct int3400_thermal_priv *priv) 356 { 357 int i; 358 359 if (priv->odvp_attrs) { 360 for (i = 0; i < priv->odvp_count; i++) { 361 sysfs_remove_file(&priv->pdev->dev.kobj, 362 &priv->odvp_attrs[i].attr.attr); 363 kfree(priv->odvp_attrs[i].attr.attr.name); 364 } 365 kfree(priv->odvp_attrs); 366 } 367 kfree(priv->odvp); 368 priv->odvp_count = 0; 369 } 370 371 static int evaluate_odvp(struct int3400_thermal_priv *priv) 372 { 373 struct acpi_buffer odvp = { ACPI_ALLOCATE_BUFFER, NULL }; 374 union acpi_object *obj = NULL; 375 acpi_status status; 376 int i, ret; 377 378 status = acpi_evaluate_object(priv->adev->handle, "ODVP", NULL, &odvp); 379 if (ACPI_FAILURE(status)) { 380 ret = -EINVAL; 381 goto out_err; 382 } 383 384 obj = odvp.pointer; 385 if (obj->type != ACPI_TYPE_PACKAGE) { 386 ret = -EINVAL; 387 goto out_err; 388 } 389 390 if (priv->odvp == NULL) { 391 priv->odvp_count = obj->package.count; 392 priv->odvp = kmalloc_array(priv->odvp_count, sizeof(int), 393 GFP_KERNEL); 394 if (!priv->odvp) { 395 ret = -ENOMEM; 396 goto out_err; 397 } 398 } 399 400 if (priv->odvp_attrs == NULL) { 401 priv->odvp_attrs = kcalloc(priv->odvp_count, 402 sizeof(struct odvp_attr), 403 GFP_KERNEL); 404 if (!priv->odvp_attrs) { 405 ret = -ENOMEM; 406 goto out_err; 407 } 408 for (i = 0; i < priv->odvp_count; i++) { 409 struct odvp_attr *odvp = &priv->odvp_attrs[i]; 410 411 sysfs_attr_init(&odvp->attr.attr); 412 odvp->priv = priv; 413 odvp->odvp = i; 414 odvp->attr.attr.name = kasprintf(GFP_KERNEL, 415 "odvp%d", i); 416 417 if (!odvp->attr.attr.name) { 418 ret = -ENOMEM; 419 goto out_err; 420 } 421 odvp->attr.attr.mode = 0444; 422 odvp->attr.show = odvp_show; 423 odvp->attr.store = NULL; 424 ret = sysfs_create_file(&priv->pdev->dev.kobj, 425 &odvp->attr.attr); 426 if (ret) 427 goto out_err; 428 } 429 } 430 431 for (i = 0; i < obj->package.count; i++) { 432 if (obj->package.elements[i].type == ACPI_TYPE_INTEGER) 433 priv->odvp[i] = obj->package.elements[i].integer.value; 434 } 435 436 kfree(obj); 437 return 0; 438 439 out_err: 440 cleanup_odvp(priv); 441 kfree(obj); 442 return ret; 443 } 444 445 static void int3400_notify(acpi_handle handle, 446 u32 event, 447 void *data) 448 { 449 struct int3400_thermal_priv *priv = data; 450 struct device *dev; 451 char *thermal_prop[5]; 452 int therm_event; 453 454 if (!priv) 455 return; 456 457 switch (event) { 458 case INT3400_THERMAL_TABLE_CHANGED: 459 therm_event = THERMAL_TABLE_CHANGED; 460 break; 461 case INT3400_KEEP_ALIVE: 462 therm_event = THERMAL_EVENT_KEEP_ALIVE; 463 break; 464 case INT3400_ODVP_CHANGED: 465 evaluate_odvp(priv); 466 therm_event = THERMAL_DEVICE_POWER_CAPABILITY_CHANGED; 467 break; 468 default: 469 /* Ignore unknown notification codes sent to INT3400 device */ 470 return; 471 } 472 473 dev = thermal_zone_device(priv->thermal); 474 475 thermal_prop[0] = kasprintf(GFP_KERNEL, "NAME=%s", thermal_zone_device_type(priv->thermal)); 476 thermal_prop[1] = kasprintf(GFP_KERNEL, "TEMP=%d", INT3400_FAKE_TEMP); 477 thermal_prop[2] = kasprintf(GFP_KERNEL, "TRIP="); 478 thermal_prop[3] = kasprintf(GFP_KERNEL, "EVENT=%d", therm_event); 479 thermal_prop[4] = NULL; 480 kobject_uevent_env(&dev->kobj, KOBJ_CHANGE, thermal_prop); 481 kfree(thermal_prop[0]); 482 kfree(thermal_prop[1]); 483 kfree(thermal_prop[2]); 484 kfree(thermal_prop[3]); 485 } 486 487 static int int3400_thermal_get_temp(struct thermal_zone_device *thermal, 488 int *temp) 489 { 490 *temp = INT3400_FAKE_TEMP; 491 return 0; 492 } 493 494 static int int3400_thermal_change_mode(struct thermal_zone_device *thermal, 495 enum thermal_device_mode mode) 496 { 497 struct int3400_thermal_priv *priv = thermal_zone_device_priv(thermal); 498 int result = 0; 499 int enabled; 500 501 if (!priv) 502 return -EINVAL; 503 504 enabled = mode == THERMAL_DEVICE_ENABLED; 505 506 if (priv->os_uuid_mask) { 507 if (!enabled) { 508 priv->os_uuid_mask = 0; 509 result = set_os_uuid_mask(priv, priv->os_uuid_mask); 510 } 511 goto eval_odvp; 512 } 513 514 if (priv->current_uuid_index < 0 || 515 priv->current_uuid_index >= INT3400_THERMAL_MAXIMUM_UUID) 516 return -EINVAL; 517 518 result = int3400_thermal_run_osc(priv->adev->handle, 519 int3400_thermal_uuids[priv->current_uuid_index], 520 &enabled); 521 eval_odvp: 522 evaluate_odvp(priv); 523 524 return result; 525 } 526 527 static struct thermal_zone_device_ops int3400_thermal_ops = { 528 .get_temp = int3400_thermal_get_temp, 529 .change_mode = int3400_thermal_change_mode, 530 }; 531 532 static struct thermal_zone_params int3400_thermal_params = { 533 .governor_name = "user_space", 534 .no_hwmon = true, 535 }; 536 537 static void int3400_setup_gddv(struct int3400_thermal_priv *priv) 538 { 539 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 540 union acpi_object *obj; 541 acpi_status status; 542 543 status = acpi_evaluate_object(priv->adev->handle, "GDDV", NULL, 544 &buffer); 545 if (ACPI_FAILURE(status) || !buffer.length) 546 return; 547 548 obj = buffer.pointer; 549 if (obj->type != ACPI_TYPE_PACKAGE || obj->package.count != 1 550 || obj->package.elements[0].type != ACPI_TYPE_BUFFER) 551 goto out_free; 552 553 priv->data_vault = kmemdup(obj->package.elements[0].buffer.pointer, 554 obj->package.elements[0].buffer.length, 555 GFP_KERNEL); 556 if (ZERO_OR_NULL_PTR(priv->data_vault)) 557 goto out_free; 558 559 bin_attr_data_vault.private = priv->data_vault; 560 bin_attr_data_vault.size = obj->package.elements[0].buffer.length; 561 out_free: 562 kfree(buffer.pointer); 563 } 564 565 static int int3400_thermal_probe(struct platform_device *pdev) 566 { 567 struct acpi_device *adev = ACPI_COMPANION(&pdev->dev); 568 struct int3400_thermal_priv *priv; 569 int result; 570 571 if (!adev) 572 return -ENODEV; 573 574 priv = kzalloc(sizeof(struct int3400_thermal_priv), GFP_KERNEL); 575 if (!priv) 576 return -ENOMEM; 577 578 priv->pdev = pdev; 579 priv->adev = adev; 580 581 result = int3400_thermal_get_uuids(priv); 582 583 /* Missing IDSP isn't fatal */ 584 if (result && result != -ENODEV) 585 goto free_priv; 586 587 priv->current_uuid_index = -1; 588 589 result = acpi_parse_art(priv->adev->handle, &priv->art_count, 590 &priv->arts, true); 591 if (result) 592 dev_dbg(&pdev->dev, "_ART table parsing error\n"); 593 594 result = acpi_parse_trt(priv->adev->handle, &priv->trt_count, 595 &priv->trts, true); 596 if (result) 597 dev_dbg(&pdev->dev, "_TRT table parsing error\n"); 598 599 platform_set_drvdata(pdev, priv); 600 601 int3400_setup_gddv(priv); 602 603 evaluate_odvp(priv); 604 605 priv->thermal = thermal_tripless_zone_device_register("INT3400 Thermal", priv, 606 &int3400_thermal_ops, 607 &int3400_thermal_params); 608 if (IS_ERR(priv->thermal)) { 609 result = PTR_ERR(priv->thermal); 610 goto free_art_trt; 611 } 612 613 priv->rel_misc_dev_res = acpi_thermal_rel_misc_device_add( 614 priv->adev->handle); 615 616 result = sysfs_create_group(&pdev->dev.kobj, &uuid_attribute_group); 617 if (result) 618 goto free_rel_misc; 619 620 if (acpi_has_method(priv->adev->handle, "IMOK")) { 621 result = sysfs_create_group(&pdev->dev.kobj, &imok_attribute_group); 622 if (result) 623 goto free_imok; 624 } 625 626 if (!ZERO_OR_NULL_PTR(priv->data_vault)) { 627 result = sysfs_create_group(&pdev->dev.kobj, 628 &data_attribute_group); 629 if (result) 630 goto free_uuid; 631 } 632 633 result = acpi_install_notify_handler( 634 priv->adev->handle, ACPI_DEVICE_NOTIFY, int3400_notify, 635 (void *)priv); 636 if (result) 637 goto free_sysfs; 638 639 result = production_mode_init(priv); 640 if (result) 641 goto free_notify; 642 643 return 0; 644 645 free_notify: 646 acpi_remove_notify_handler(priv->adev->handle, ACPI_DEVICE_NOTIFY, 647 int3400_notify); 648 free_sysfs: 649 cleanup_odvp(priv); 650 if (!ZERO_OR_NULL_PTR(priv->data_vault)) { 651 sysfs_remove_group(&pdev->dev.kobj, &data_attribute_group); 652 kfree(priv->data_vault); 653 } 654 free_uuid: 655 sysfs_remove_group(&pdev->dev.kobj, &uuid_attribute_group); 656 free_imok: 657 sysfs_remove_group(&pdev->dev.kobj, &imok_attribute_group); 658 free_rel_misc: 659 if (!priv->rel_misc_dev_res) 660 acpi_thermal_rel_misc_device_remove(priv->adev->handle); 661 thermal_zone_device_unregister(priv->thermal); 662 free_art_trt: 663 kfree(priv->trts); 664 kfree(priv->arts); 665 free_priv: 666 kfree(priv); 667 return result; 668 } 669 670 static void int3400_thermal_remove(struct platform_device *pdev) 671 { 672 struct int3400_thermal_priv *priv = platform_get_drvdata(pdev); 673 674 production_mode_exit(priv); 675 676 acpi_remove_notify_handler( 677 priv->adev->handle, ACPI_DEVICE_NOTIFY, 678 int3400_notify); 679 680 cleanup_odvp(priv); 681 682 if (!priv->rel_misc_dev_res) 683 acpi_thermal_rel_misc_device_remove(priv->adev->handle); 684 685 if (!ZERO_OR_NULL_PTR(priv->data_vault)) 686 sysfs_remove_group(&pdev->dev.kobj, &data_attribute_group); 687 sysfs_remove_group(&pdev->dev.kobj, &uuid_attribute_group); 688 sysfs_remove_group(&pdev->dev.kobj, &imok_attribute_group); 689 thermal_zone_device_unregister(priv->thermal); 690 kfree(priv->data_vault); 691 kfree(priv->trts); 692 kfree(priv->arts); 693 kfree(priv); 694 } 695 696 static const struct acpi_device_id int3400_thermal_match[] = { 697 {"INT3400", 0}, 698 {"INTC1040", 0}, 699 {"INTC1041", 0}, 700 {"INTC1042", 0}, 701 {"INTC1068", 0}, 702 {"INTC10A0", 0}, 703 {} 704 }; 705 706 MODULE_DEVICE_TABLE(acpi, int3400_thermal_match); 707 708 static struct platform_driver int3400_thermal_driver = { 709 .probe = int3400_thermal_probe, 710 .remove_new = int3400_thermal_remove, 711 .driver = { 712 .name = "int3400 thermal", 713 .acpi_match_table = ACPI_PTR(int3400_thermal_match), 714 }, 715 }; 716 717 module_platform_driver(int3400_thermal_driver); 718 719 MODULE_DESCRIPTION("INT3400 Thermal driver"); 720 MODULE_AUTHOR("Zhang Rui <rui.zhang@intel.com>"); 721 MODULE_LICENSE("GPL"); 722