1// SPDX-License-Identifier: GPL-2.0-only 2/* 3 * Copyright (C) 2007-2009 Luca Tettamanti <kronos.it@gmail.com> 4 * 5 * See COPYING in the top level directory of the kernel tree. 6 */ 7 8#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 9 10#include <linux/debugfs.h> 11#include <linux/kernel.h> 12#include <linux/hwmon.h> 13#include <linux/list.h> 14#include <linux/module.h> 15#include <linux/slab.h> 16#include <linux/dmi.h> 17#include <linux/jiffies.h> 18#include <linux/err.h> 19#include <linux/acpi.h> 20 21#define ATK_HID "ATK0110" 22 23static bool new_if; 24module_param(new_if, bool, 0); 25MODULE_PARM_DESC(new_if, "Override detection heuristic and force the use of the new ATK0110 interface"); 26 27static const struct dmi_system_id __initconst atk_force_new_if[] = { 28 { 29 /* Old interface has broken MCH temp monitoring */ 30 .ident = "Asus Sabertooth X58", 31 .matches = { 32 DMI_MATCH(DMI_BOARD_NAME, "SABERTOOTH X58") 33 } 34 }, { 35 /* Old interface reads the same sensor for fan0 and fan1 */ 36 .ident = "Asus M5A78L", 37 .matches = { 38 DMI_MATCH(DMI_BOARD_NAME, "M5A78L") 39 } 40 }, 41 { } 42}; 43 44/* 45 * Minimum time between readings, enforced in order to avoid 46 * hogging the CPU. 47 */ 48#define CACHE_TIME HZ 49 50#define BOARD_ID "MBIF" 51#define METHOD_ENUMERATE "GGRP" 52#define METHOD_READ "GITM" 53#define METHOD_WRITE "SITM" 54#define METHOD_OLD_READ_TMP "RTMP" 55#define METHOD_OLD_READ_VLT "RVLT" 56#define METHOD_OLD_READ_FAN "RFAN" 57#define METHOD_OLD_ENUM_TMP "TSIF" 58#define METHOD_OLD_ENUM_VLT "VSIF" 59#define METHOD_OLD_ENUM_FAN "FSIF" 60 61#define ATK_MUX_HWMON 0x00000006ULL 62#define ATK_MUX_MGMT 0x00000011ULL 63 64#define ATK_CLASS_MASK 0xff000000ULL 65#define ATK_CLASS_FREQ_CTL 0x03000000ULL 66#define ATK_CLASS_FAN_CTL 0x04000000ULL 67#define ATK_CLASS_HWMON 0x06000000ULL 68#define ATK_CLASS_MGMT 0x11000000ULL 69 70#define ATK_TYPE_MASK 0x00ff0000ULL 71#define HWMON_TYPE_VOLT 0x00020000ULL 72#define HWMON_TYPE_TEMP 0x00030000ULL 73#define HWMON_TYPE_FAN 0x00040000ULL 74 75#define ATK_ELEMENT_ID_MASK 0x0000ffffULL 76 77#define ATK_EC_ID 0x11060004ULL 78 79enum atk_pack_member { 80 HWMON_PACK_FLAGS, 81 HWMON_PACK_NAME, 82 HWMON_PACK_LIMIT1, 83 HWMON_PACK_LIMIT2, 84 HWMON_PACK_ENABLE 85}; 86 87/* New package format */ 88#define _HWMON_NEW_PACK_SIZE 7 89#define _HWMON_NEW_PACK_FLAGS 0 90#define _HWMON_NEW_PACK_NAME 1 91#define _HWMON_NEW_PACK_UNK1 2 92#define _HWMON_NEW_PACK_UNK2 3 93#define _HWMON_NEW_PACK_LIMIT1 4 94#define _HWMON_NEW_PACK_LIMIT2 5 95#define _HWMON_NEW_PACK_ENABLE 6 96 97/* Old package format */ 98#define _HWMON_OLD_PACK_SIZE 5 99#define _HWMON_OLD_PACK_FLAGS 0 100#define _HWMON_OLD_PACK_NAME 1 101#define _HWMON_OLD_PACK_LIMIT1 2 102#define _HWMON_OLD_PACK_LIMIT2 3 103#define _HWMON_OLD_PACK_ENABLE 4 104 105 106struct atk_data { 107 struct device *hwmon_dev; 108 acpi_handle atk_handle; 109 struct acpi_device *acpi_dev; 110 111 bool old_interface; 112 113 /* old interface */ 114 acpi_handle rtmp_handle; 115 acpi_handle rvlt_handle; 116 acpi_handle rfan_handle; 117 /* new interface */ 118 acpi_handle enumerate_handle; 119 acpi_handle read_handle; 120 acpi_handle write_handle; 121 122 bool disable_ec; 123 124 int voltage_count; 125 int temperature_count; 126 int fan_count; 127 struct list_head sensor_list; 128 struct attribute_group attr_group; 129 const struct attribute_group *attr_groups[2]; 130 131 struct { 132 struct dentry *root; 133 u32 id; 134 } debugfs; 135}; 136 137 138typedef ssize_t (*sysfs_show_func)(struct device *dev, 139 struct device_attribute *attr, char *buf); 140 141static const struct acpi_device_id atk_ids[] = { 142 {ATK_HID, 0}, 143 {"", 0}, 144}; 145MODULE_DEVICE_TABLE(acpi, atk_ids); 146 147#define ATTR_NAME_SIZE 16 /* Worst case is "tempN_input" */ 148 149struct atk_sensor_data { 150 struct list_head list; 151 struct atk_data *data; 152 struct device_attribute label_attr; 153 struct device_attribute input_attr; 154 struct device_attribute limit1_attr; 155 struct device_attribute limit2_attr; 156 char label_attr_name[ATTR_NAME_SIZE]; 157 char input_attr_name[ATTR_NAME_SIZE]; 158 char limit1_attr_name[ATTR_NAME_SIZE]; 159 char limit2_attr_name[ATTR_NAME_SIZE]; 160 u64 id; 161 u64 type; 162 u64 limit1; 163 u64 limit2; 164 u64 cached_value; 165 unsigned long last_updated; /* in jiffies */ 166 bool is_valid; 167 char const *acpi_name; 168}; 169 170/* 171 * Return buffer format: 172 * [0-3] "value" is valid flag 173 * [4-7] value 174 * [8- ] unknown stuff on newer mobos 175 */ 176struct atk_acpi_ret_buffer { 177 u32 flags; 178 u32 value; 179 u8 data[]; 180}; 181 182/* Input buffer used for GITM and SITM methods */ 183struct atk_acpi_input_buf { 184 u32 id; 185 u32 param1; 186 u32 param2; 187}; 188 189static int atk_add(struct acpi_device *device); 190static void atk_remove(struct acpi_device *device); 191static void atk_print_sensor(struct atk_data *data, union acpi_object *obj); 192static int atk_read_value(struct atk_sensor_data *sensor, u64 *value); 193 194static struct acpi_driver atk_driver = { 195 .name = ATK_HID, 196 .class = "hwmon", 197 .ids = atk_ids, 198 .ops = { 199 .add = atk_add, 200 .remove = atk_remove, 201 }, 202}; 203 204#define input_to_atk_sensor(attr) \ 205 container_of(attr, struct atk_sensor_data, input_attr) 206 207#define label_to_atk_sensor(attr) \ 208 container_of(attr, struct atk_sensor_data, label_attr) 209 210#define limit1_to_atk_sensor(attr) \ 211 container_of(attr, struct atk_sensor_data, limit1_attr) 212 213#define limit2_to_atk_sensor(attr) \ 214 container_of(attr, struct atk_sensor_data, limit2_attr) 215 216static ssize_t atk_input_show(struct device *dev, 217 struct device_attribute *attr, char *buf) 218{ 219 struct atk_sensor_data *s = input_to_atk_sensor(attr); 220 u64 value; 221 int err; 222 223 err = atk_read_value(s, &value); 224 if (err) 225 return err; 226 227 if (s->type == HWMON_TYPE_TEMP) 228 /* ACPI returns decidegree */ 229 value *= 100; 230 231 return sprintf(buf, "%llu\n", value); 232} 233 234static ssize_t atk_label_show(struct device *dev, 235 struct device_attribute *attr, char *buf) 236{ 237 struct atk_sensor_data *s = label_to_atk_sensor(attr); 238 239 return sprintf(buf, "%s\n", s->acpi_name); 240} 241 242static ssize_t atk_limit1_show(struct device *dev, 243 struct device_attribute *attr, char *buf) 244{ 245 struct atk_sensor_data *s = limit1_to_atk_sensor(attr); 246 u64 value = s->limit1; 247 248 if (s->type == HWMON_TYPE_TEMP) 249 value *= 100; 250 251 return sprintf(buf, "%lld\n", value); 252} 253 254static ssize_t atk_limit2_show(struct device *dev, 255 struct device_attribute *attr, char *buf) 256{ 257 struct atk_sensor_data *s = limit2_to_atk_sensor(attr); 258 u64 value = s->limit2; 259 260 if (s->type == HWMON_TYPE_TEMP) 261 value *= 100; 262 263 return sprintf(buf, "%lld\n", value); 264} 265 266static void atk_init_attribute(struct device_attribute *attr, char *name, 267 sysfs_show_func show) 268{ 269 sysfs_attr_init(&attr->attr); 270 attr->attr.name = name; 271 attr->attr.mode = 0444; 272 attr->show = show; 273 attr->store = NULL; 274} 275 276 277static union acpi_object *atk_get_pack_member(struct atk_data *data, 278 union acpi_object *pack, 279 enum atk_pack_member m) 280{ 281 bool old_if = data->old_interface; 282 int offset; 283 284 switch (m) { 285 case HWMON_PACK_FLAGS: 286 offset = old_if ? _HWMON_OLD_PACK_FLAGS : _HWMON_NEW_PACK_FLAGS; 287 break; 288 case HWMON_PACK_NAME: 289 offset = old_if ? _HWMON_OLD_PACK_NAME : _HWMON_NEW_PACK_NAME; 290 break; 291 case HWMON_PACK_LIMIT1: 292 offset = old_if ? _HWMON_OLD_PACK_LIMIT1 : 293 _HWMON_NEW_PACK_LIMIT1; 294 break; 295 case HWMON_PACK_LIMIT2: 296 offset = old_if ? _HWMON_OLD_PACK_LIMIT2 : 297 _HWMON_NEW_PACK_LIMIT2; 298 break; 299 case HWMON_PACK_ENABLE: 300 offset = old_if ? _HWMON_OLD_PACK_ENABLE : 301 _HWMON_NEW_PACK_ENABLE; 302 break; 303 default: 304 return NULL; 305 } 306 307 return &pack->package.elements[offset]; 308} 309 310 311/* 312 * New package format is: 313 * - flag (int) 314 * class - used for de-muxing the request to the correct GITn 315 * type (volt, temp, fan) 316 * sensor id | 317 * sensor id - used for de-muxing the request _inside_ the GITn 318 * - name (str) 319 * - unknown (int) 320 * - unknown (int) 321 * - limit1 (int) 322 * - limit2 (int) 323 * - enable (int) 324 * 325 * The old package has the same format but it's missing the two unknown fields. 326 */ 327static int validate_hwmon_pack(struct atk_data *data, union acpi_object *obj) 328{ 329 struct device *dev = &data->acpi_dev->dev; 330 union acpi_object *tmp; 331 bool old_if = data->old_interface; 332 int const expected_size = old_if ? _HWMON_OLD_PACK_SIZE : 333 _HWMON_NEW_PACK_SIZE; 334 335 if (obj->type != ACPI_TYPE_PACKAGE) { 336 dev_warn(dev, "Invalid type: %d\n", obj->type); 337 return -EINVAL; 338 } 339 340 if (obj->package.count != expected_size) { 341 dev_warn(dev, "Invalid package size: %d, expected: %d\n", 342 obj->package.count, expected_size); 343 return -EINVAL; 344 } 345 346 tmp = atk_get_pack_member(data, obj, HWMON_PACK_FLAGS); 347 if (tmp->type != ACPI_TYPE_INTEGER) { 348 dev_warn(dev, "Invalid type (flag): %d\n", tmp->type); 349 return -EINVAL; 350 } 351 352 tmp = atk_get_pack_member(data, obj, HWMON_PACK_NAME); 353 if (tmp->type != ACPI_TYPE_STRING) { 354 dev_warn(dev, "Invalid type (name): %d\n", tmp->type); 355 return -EINVAL; 356 } 357 358 /* Don't check... we don't know what they're useful for anyway */ 359#if 0 360 tmp = &obj->package.elements[HWMON_PACK_UNK1]; 361 if (tmp->type != ACPI_TYPE_INTEGER) { 362 dev_warn(dev, "Invalid type (unk1): %d\n", tmp->type); 363 return -EINVAL; 364 } 365 366 tmp = &obj->package.elements[HWMON_PACK_UNK2]; 367 if (tmp->type != ACPI_TYPE_INTEGER) { 368 dev_warn(dev, "Invalid type (unk2): %d\n", tmp->type); 369 return -EINVAL; 370 } 371#endif 372 373 tmp = atk_get_pack_member(data, obj, HWMON_PACK_LIMIT1); 374 if (tmp->type != ACPI_TYPE_INTEGER) { 375 dev_warn(dev, "Invalid type (limit1): %d\n", tmp->type); 376 return -EINVAL; 377 } 378 379 tmp = atk_get_pack_member(data, obj, HWMON_PACK_LIMIT2); 380 if (tmp->type != ACPI_TYPE_INTEGER) { 381 dev_warn(dev, "Invalid type (limit2): %d\n", tmp->type); 382 return -EINVAL; 383 } 384 385 tmp = atk_get_pack_member(data, obj, HWMON_PACK_ENABLE); 386 if (tmp->type != ACPI_TYPE_INTEGER) { 387 dev_warn(dev, "Invalid type (enable): %d\n", tmp->type); 388 return -EINVAL; 389 } 390 391 atk_print_sensor(data, obj); 392 393 return 0; 394} 395 396#ifdef DEBUG 397static char const *atk_sensor_type(union acpi_object *flags) 398{ 399 u64 type = flags->integer.value & ATK_TYPE_MASK; 400 char const *what; 401 402 switch (type) { 403 case HWMON_TYPE_VOLT: 404 what = "voltage"; 405 break; 406 case HWMON_TYPE_TEMP: 407 what = "temperature"; 408 break; 409 case HWMON_TYPE_FAN: 410 what = "fan"; 411 break; 412 default: 413 what = "unknown"; 414 break; 415 } 416 417 return what; 418} 419#endif 420 421static void atk_print_sensor(struct atk_data *data, union acpi_object *obj) 422{ 423#ifdef DEBUG 424 struct device *dev = &data->acpi_dev->dev; 425 union acpi_object *flags; 426 union acpi_object *name; 427 union acpi_object *limit1; 428 union acpi_object *limit2; 429 union acpi_object *enable; 430 char const *what; 431 432 flags = atk_get_pack_member(data, obj, HWMON_PACK_FLAGS); 433 name = atk_get_pack_member(data, obj, HWMON_PACK_NAME); 434 limit1 = atk_get_pack_member(data, obj, HWMON_PACK_LIMIT1); 435 limit2 = atk_get_pack_member(data, obj, HWMON_PACK_LIMIT2); 436 enable = atk_get_pack_member(data, obj, HWMON_PACK_ENABLE); 437 438 what = atk_sensor_type(flags); 439 440 dev_dbg(dev, "%s: %#llx %s [%llu-%llu] %s\n", what, 441 flags->integer.value, 442 name->string.pointer, 443 limit1->integer.value, limit2->integer.value, 444 enable->integer.value ? "enabled" : "disabled"); 445#endif 446} 447 448static int atk_read_value_old(struct atk_sensor_data *sensor, u64 *value) 449{ 450 struct atk_data *data = sensor->data; 451 struct device *dev = &data->acpi_dev->dev; 452 struct acpi_object_list params; 453 union acpi_object id; 454 acpi_status status; 455 acpi_handle method; 456 457 switch (sensor->type) { 458 case HWMON_TYPE_VOLT: 459 method = data->rvlt_handle; 460 break; 461 case HWMON_TYPE_TEMP: 462 method = data->rtmp_handle; 463 break; 464 case HWMON_TYPE_FAN: 465 method = data->rfan_handle; 466 break; 467 default: 468 return -EINVAL; 469 } 470 471 id.type = ACPI_TYPE_INTEGER; 472 id.integer.value = sensor->id; 473 474 params.count = 1; 475 params.pointer = &id; 476 477 status = acpi_evaluate_integer(method, NULL, ¶ms, value); 478 if (status != AE_OK) { 479 dev_warn(dev, "%s: ACPI exception: %s\n", __func__, 480 acpi_format_exception(status)); 481 return -EIO; 482 } 483 484 return 0; 485} 486 487static union acpi_object *atk_ggrp(struct atk_data *data, u16 mux) 488{ 489 struct device *dev = &data->acpi_dev->dev; 490 struct acpi_buffer buf; 491 acpi_status ret; 492 struct acpi_object_list params; 493 union acpi_object id; 494 union acpi_object *pack; 495 496 id.type = ACPI_TYPE_INTEGER; 497 id.integer.value = mux; 498 params.count = 1; 499 params.pointer = &id; 500 501 buf.length = ACPI_ALLOCATE_BUFFER; 502 ret = acpi_evaluate_object(data->enumerate_handle, NULL, ¶ms, &buf); 503 if (ret != AE_OK) { 504 dev_err(dev, "GGRP[%#x] ACPI exception: %s\n", mux, 505 acpi_format_exception(ret)); 506 return ERR_PTR(-EIO); 507 } 508 pack = buf.pointer; 509 if (pack->type != ACPI_TYPE_PACKAGE) { 510 /* Execution was successful, but the id was not found */ 511 ACPI_FREE(pack); 512 return ERR_PTR(-ENOENT); 513 } 514 515 if (pack->package.count < 1) { 516 dev_err(dev, "GGRP[%#x] package is too small\n", mux); 517 ACPI_FREE(pack); 518 return ERR_PTR(-EIO); 519 } 520 return pack; 521} 522 523static union acpi_object *atk_gitm(struct atk_data *data, u64 id) 524{ 525 struct device *dev = &data->acpi_dev->dev; 526 struct atk_acpi_input_buf buf; 527 union acpi_object tmp; 528 struct acpi_object_list params; 529 struct acpi_buffer ret; 530 union acpi_object *obj; 531 acpi_status status; 532 533 buf.id = id; 534 buf.param1 = 0; 535 buf.param2 = 0; 536 537 tmp.type = ACPI_TYPE_BUFFER; 538 tmp.buffer.pointer = (u8 *)&buf; 539 tmp.buffer.length = sizeof(buf); 540 541 params.count = 1; 542 params.pointer = (void *)&tmp; 543 544 ret.length = ACPI_ALLOCATE_BUFFER; 545 status = acpi_evaluate_object_typed(data->read_handle, NULL, ¶ms, 546 &ret, ACPI_TYPE_BUFFER); 547 if (status != AE_OK) { 548 dev_warn(dev, "GITM[%#llx] ACPI exception: %s\n", id, 549 acpi_format_exception(status)); 550 return ERR_PTR(-EIO); 551 } 552 obj = ret.pointer; 553 554 /* Sanity check */ 555 if (obj->buffer.length < 8) { 556 dev_warn(dev, "Unexpected ASBF length: %u\n", 557 obj->buffer.length); 558 ACPI_FREE(obj); 559 return ERR_PTR(-EIO); 560 } 561 return obj; 562} 563 564static union acpi_object *atk_sitm(struct atk_data *data, 565 struct atk_acpi_input_buf *buf) 566{ 567 struct device *dev = &data->acpi_dev->dev; 568 struct acpi_object_list params; 569 union acpi_object tmp; 570 struct acpi_buffer ret; 571 union acpi_object *obj; 572 acpi_status status; 573 574 tmp.type = ACPI_TYPE_BUFFER; 575 tmp.buffer.pointer = (u8 *)buf; 576 tmp.buffer.length = sizeof(*buf); 577 578 params.count = 1; 579 params.pointer = &tmp; 580 581 ret.length = ACPI_ALLOCATE_BUFFER; 582 status = acpi_evaluate_object_typed(data->write_handle, NULL, ¶ms, 583 &ret, ACPI_TYPE_BUFFER); 584 if (status != AE_OK) { 585 dev_warn(dev, "SITM[%#x] ACPI exception: %s\n", buf->id, 586 acpi_format_exception(status)); 587 return ERR_PTR(-EIO); 588 } 589 obj = ret.pointer; 590 591 /* Sanity check */ 592 if (obj->buffer.length < 8) { 593 dev_warn(dev, "Unexpected ASBF length: %u\n", 594 obj->buffer.length); 595 ACPI_FREE(obj); 596 return ERR_PTR(-EIO); 597 } 598 return obj; 599} 600 601static int atk_read_value_new(struct atk_sensor_data *sensor, u64 *value) 602{ 603 struct atk_data *data = sensor->data; 604 struct device *dev = &data->acpi_dev->dev; 605 union acpi_object *obj; 606 struct atk_acpi_ret_buffer *buf; 607 int err = 0; 608 609 obj = atk_gitm(data, sensor->id); 610 if (IS_ERR(obj)) 611 return PTR_ERR(obj); 612 613 buf = (struct atk_acpi_ret_buffer *)obj->buffer.pointer; 614 if (buf->flags == 0) { 615 /* 616 * The reading is not valid, possible causes: 617 * - sensor failure 618 * - enumeration was FUBAR (and we didn't notice) 619 */ 620 dev_warn(dev, "Read failed, sensor = %#llx\n", sensor->id); 621 err = -EIO; 622 goto out; 623 } 624 625 *value = buf->value; 626out: 627 ACPI_FREE(obj); 628 return err; 629} 630 631static int atk_read_value(struct atk_sensor_data *sensor, u64 *value) 632{ 633 int err; 634 635 if (!sensor->is_valid || 636 time_after(jiffies, sensor->last_updated + CACHE_TIME)) { 637 if (sensor->data->old_interface) 638 err = atk_read_value_old(sensor, value); 639 else 640 err = atk_read_value_new(sensor, value); 641 642 if (err) 643 return err; 644 645 sensor->is_valid = true; 646 sensor->last_updated = jiffies; 647 sensor->cached_value = *value; 648 } else { 649 *value = sensor->cached_value; 650 err = 0; 651 } 652 653 return err; 654} 655 656#ifdef CONFIG_DEBUG_FS 657static int atk_debugfs_gitm_get(void *p, u64 *val) 658{ 659 struct atk_data *data = p; 660 union acpi_object *ret; 661 struct atk_acpi_ret_buffer *buf; 662 int err = 0; 663 664 if (!data->read_handle) 665 return -ENODEV; 666 667 if (!data->debugfs.id) 668 return -EINVAL; 669 670 ret = atk_gitm(data, data->debugfs.id); 671 if (IS_ERR(ret)) 672 return PTR_ERR(ret); 673 674 buf = (struct atk_acpi_ret_buffer *)ret->buffer.pointer; 675 if (buf->flags) 676 *val = buf->value; 677 else 678 err = -EIO; 679 680 ACPI_FREE(ret); 681 return err; 682} 683 684DEFINE_DEBUGFS_ATTRIBUTE(atk_debugfs_gitm, atk_debugfs_gitm_get, NULL, 685 "0x%08llx\n"); 686 687static int atk_acpi_print(char *buf, size_t sz, union acpi_object *obj) 688{ 689 int ret = 0; 690 691 switch (obj->type) { 692 case ACPI_TYPE_INTEGER: 693 ret = snprintf(buf, sz, "0x%08llx\n", obj->integer.value); 694 break; 695 case ACPI_TYPE_STRING: 696 ret = snprintf(buf, sz, "%s\n", obj->string.pointer); 697 break; 698 } 699 700 return ret; 701} 702 703static void atk_pack_print(char *buf, size_t sz, union acpi_object *pack) 704{ 705 int ret; 706 int i; 707 708 for (i = 0; i < pack->package.count; i++) { 709 union acpi_object *obj = &pack->package.elements[i]; 710 711 ret = atk_acpi_print(buf, sz, obj); 712 if (ret >= sz) 713 break; 714 buf += ret; 715 sz -= ret; 716 } 717} 718 719static int atk_debugfs_ggrp_open(struct inode *inode, struct file *file) 720{ 721 struct atk_data *data = inode->i_private; 722 char *buf = NULL; 723 union acpi_object *ret; 724 u8 cls; 725 int i; 726 727 if (!data->enumerate_handle) 728 return -ENODEV; 729 if (!data->debugfs.id) 730 return -EINVAL; 731 732 cls = (data->debugfs.id & 0xff000000) >> 24; 733 ret = atk_ggrp(data, cls); 734 if (IS_ERR(ret)) 735 return PTR_ERR(ret); 736 737 for (i = 0; i < ret->package.count; i++) { 738 union acpi_object *pack = &ret->package.elements[i]; 739 union acpi_object *id; 740 741 if (pack->type != ACPI_TYPE_PACKAGE) 742 continue; 743 if (!pack->package.count) 744 continue; 745 id = &pack->package.elements[0]; 746 if (id->integer.value == data->debugfs.id) { 747 /* Print the package */ 748 buf = kzalloc(512, GFP_KERNEL); 749 if (!buf) { 750 ACPI_FREE(ret); 751 return -ENOMEM; 752 } 753 atk_pack_print(buf, 512, pack); 754 break; 755 } 756 } 757 ACPI_FREE(ret); 758 759 if (!buf) 760 return -EINVAL; 761 762 file->private_data = buf; 763 764 return nonseekable_open(inode, file); 765} 766 767static ssize_t atk_debugfs_ggrp_read(struct file *file, char __user *buf, 768 size_t count, loff_t *pos) 769{ 770 char *str = file->private_data; 771 size_t len = strlen(str); 772 773 return simple_read_from_buffer(buf, count, pos, str, len); 774} 775 776static int atk_debugfs_ggrp_release(struct inode *inode, struct file *file) 777{ 778 kfree(file->private_data); 779 return 0; 780} 781 782static const struct file_operations atk_debugfs_ggrp_fops = { 783 .read = atk_debugfs_ggrp_read, 784 .open = atk_debugfs_ggrp_open, 785 .release = atk_debugfs_ggrp_release, 786 .llseek = no_llseek, 787}; 788 789static void atk_debugfs_init(struct atk_data *data) 790{ 791 struct dentry *d; 792 793 data->debugfs.id = 0; 794 795 d = debugfs_create_dir("asus_atk0110", NULL); 796 797 debugfs_create_x32("id", 0600, d, &data->debugfs.id); 798 debugfs_create_file_unsafe("gitm", 0400, d, data, &atk_debugfs_gitm); 799 debugfs_create_file("ggrp", 0400, d, data, &atk_debugfs_ggrp_fops); 800 801 data->debugfs.root = d; 802} 803 804static void atk_debugfs_cleanup(struct atk_data *data) 805{ 806 debugfs_remove_recursive(data->debugfs.root); 807} 808 809#else /* CONFIG_DEBUG_FS */ 810 811static void atk_debugfs_init(struct atk_data *data) 812{ 813} 814 815static void atk_debugfs_cleanup(struct atk_data *data) 816{ 817} 818#endif 819 820static int atk_add_sensor(struct atk_data *data, union acpi_object *obj) 821{ 822 struct device *dev = &data->acpi_dev->dev; 823 union acpi_object *flags; 824 union acpi_object *name; 825 union acpi_object *limit1; 826 union acpi_object *limit2; 827 union acpi_object *enable; 828 struct atk_sensor_data *sensor; 829 char const *base_name; 830 char const *limit1_name; 831 char const *limit2_name; 832 u64 type; 833 int err; 834 int *num; 835 int start; 836 837 if (obj->type != ACPI_TYPE_PACKAGE) { 838 /* wft is this? */ 839 dev_warn(dev, "Unknown type for ACPI object: (%d)\n", 840 obj->type); 841 return -EINVAL; 842 } 843 844 err = validate_hwmon_pack(data, obj); 845 if (err) 846 return err; 847 848 /* Ok, we have a valid hwmon package */ 849 type = atk_get_pack_member(data, obj, HWMON_PACK_FLAGS)->integer.value 850 & ATK_TYPE_MASK; 851 852 switch (type) { 853 case HWMON_TYPE_VOLT: 854 base_name = "in"; 855 limit1_name = "min"; 856 limit2_name = "max"; 857 num = &data->voltage_count; 858 start = 0; 859 break; 860 case HWMON_TYPE_TEMP: 861 base_name = "temp"; 862 limit1_name = "max"; 863 limit2_name = "crit"; 864 num = &data->temperature_count; 865 start = 1; 866 break; 867 case HWMON_TYPE_FAN: 868 base_name = "fan"; 869 limit1_name = "min"; 870 limit2_name = "max"; 871 num = &data->fan_count; 872 start = 1; 873 break; 874 default: 875 dev_warn(dev, "Unknown sensor type: %#llx\n", type); 876 return -EINVAL; 877 } 878 879 enable = atk_get_pack_member(data, obj, HWMON_PACK_ENABLE); 880 if (!enable->integer.value) 881 /* sensor is disabled */ 882 return 0; 883 884 flags = atk_get_pack_member(data, obj, HWMON_PACK_FLAGS); 885 name = atk_get_pack_member(data, obj, HWMON_PACK_NAME); 886 limit1 = atk_get_pack_member(data, obj, HWMON_PACK_LIMIT1); 887 limit2 = atk_get_pack_member(data, obj, HWMON_PACK_LIMIT2); 888 889 sensor = devm_kzalloc(dev, sizeof(*sensor), GFP_KERNEL); 890 if (!sensor) 891 return -ENOMEM; 892 893 sensor->acpi_name = devm_kstrdup(dev, name->string.pointer, GFP_KERNEL); 894 if (!sensor->acpi_name) 895 return -ENOMEM; 896 897 INIT_LIST_HEAD(&sensor->list); 898 sensor->type = type; 899 sensor->data = data; 900 sensor->id = flags->integer.value; 901 sensor->limit1 = limit1->integer.value; 902 if (data->old_interface) 903 sensor->limit2 = limit2->integer.value; 904 else 905 /* The upper limit is expressed as delta from lower limit */ 906 sensor->limit2 = sensor->limit1 + limit2->integer.value; 907 908 snprintf(sensor->input_attr_name, ATTR_NAME_SIZE, 909 "%s%d_input", base_name, start + *num); 910 atk_init_attribute(&sensor->input_attr, 911 sensor->input_attr_name, 912 atk_input_show); 913 914 snprintf(sensor->label_attr_name, ATTR_NAME_SIZE, 915 "%s%d_label", base_name, start + *num); 916 atk_init_attribute(&sensor->label_attr, 917 sensor->label_attr_name, 918 atk_label_show); 919 920 snprintf(sensor->limit1_attr_name, ATTR_NAME_SIZE, 921 "%s%d_%s", base_name, start + *num, limit1_name); 922 atk_init_attribute(&sensor->limit1_attr, 923 sensor->limit1_attr_name, 924 atk_limit1_show); 925 926 snprintf(sensor->limit2_attr_name, ATTR_NAME_SIZE, 927 "%s%d_%s", base_name, start + *num, limit2_name); 928 atk_init_attribute(&sensor->limit2_attr, 929 sensor->limit2_attr_name, 930 atk_limit2_show); 931 932 list_add(&sensor->list, &data->sensor_list); 933 (*num)++; 934 935 return 1; 936} 937 938static int atk_enumerate_old_hwmon(struct atk_data *data) 939{ 940 struct device *dev = &data->acpi_dev->dev; 941 struct acpi_buffer buf; 942 union acpi_object *pack; 943 acpi_status status; 944 int i, ret; 945 int count = 0; 946 947 /* Voltages */ 948 buf.length = ACPI_ALLOCATE_BUFFER; 949 status = acpi_evaluate_object_typed(data->atk_handle, 950 METHOD_OLD_ENUM_VLT, NULL, &buf, ACPI_TYPE_PACKAGE); 951 if (status != AE_OK) { 952 dev_warn(dev, METHOD_OLD_ENUM_VLT ": ACPI exception: %s\n", 953 acpi_format_exception(status)); 954 955 return -ENODEV; 956 } 957 958 pack = buf.pointer; 959 for (i = 1; i < pack->package.count; i++) { 960 union acpi_object *obj = &pack->package.elements[i]; 961 962 ret = atk_add_sensor(data, obj); 963 if (ret > 0) 964 count++; 965 } 966 ACPI_FREE(buf.pointer); 967 968 /* Temperatures */ 969 buf.length = ACPI_ALLOCATE_BUFFER; 970 status = acpi_evaluate_object_typed(data->atk_handle, 971 METHOD_OLD_ENUM_TMP, NULL, &buf, ACPI_TYPE_PACKAGE); 972 if (status != AE_OK) { 973 dev_warn(dev, METHOD_OLD_ENUM_TMP ": ACPI exception: %s\n", 974 acpi_format_exception(status)); 975 976 return -ENODEV; 977 } 978 979 pack = buf.pointer; 980 for (i = 1; i < pack->package.count; i++) { 981 union acpi_object *obj = &pack->package.elements[i]; 982 983 ret = atk_add_sensor(data, obj); 984 if (ret > 0) 985 count++; 986 } 987 ACPI_FREE(buf.pointer); 988 989 /* Fans */ 990 buf.length = ACPI_ALLOCATE_BUFFER; 991 status = acpi_evaluate_object_typed(data->atk_handle, 992 METHOD_OLD_ENUM_FAN, NULL, &buf, ACPI_TYPE_PACKAGE); 993 if (status != AE_OK) { 994 dev_warn(dev, METHOD_OLD_ENUM_FAN ": ACPI exception: %s\n", 995 acpi_format_exception(status)); 996 997 return -ENODEV; 998 } 999 1000 pack = buf.pointer; 1001 for (i = 1; i < pack->package.count; i++) { 1002 union acpi_object *obj = &pack->package.elements[i]; 1003 1004 ret = atk_add_sensor(data, obj); 1005 if (ret > 0) 1006 count++; 1007 } 1008 ACPI_FREE(buf.pointer); 1009 1010 return count; 1011} 1012 1013static int atk_ec_present(struct atk_data *data) 1014{ 1015 struct device *dev = &data->acpi_dev->dev; 1016 union acpi_object *pack; 1017 union acpi_object *ec; 1018 int ret; 1019 int i; 1020 1021 pack = atk_ggrp(data, ATK_MUX_MGMT); 1022 if (IS_ERR(pack)) { 1023 if (PTR_ERR(pack) == -ENOENT) { 1024 /* The MGMT class does not exists - that's ok */ 1025 dev_dbg(dev, "Class %#llx not found\n", ATK_MUX_MGMT); 1026 return 0; 1027 } 1028 return PTR_ERR(pack); 1029 } 1030 1031 /* Search the EC */ 1032 ec = NULL; 1033 for (i = 0; i < pack->package.count; i++) { 1034 union acpi_object *obj = &pack->package.elements[i]; 1035 union acpi_object *id; 1036 1037 if (obj->type != ACPI_TYPE_PACKAGE) 1038 continue; 1039 1040 id = &obj->package.elements[0]; 1041 if (id->type != ACPI_TYPE_INTEGER) 1042 continue; 1043 1044 if (id->integer.value == ATK_EC_ID) { 1045 ec = obj; 1046 break; 1047 } 1048 } 1049 1050 ret = (ec != NULL); 1051 if (!ret) 1052 /* The system has no EC */ 1053 dev_dbg(dev, "EC not found\n"); 1054 1055 ACPI_FREE(pack); 1056 return ret; 1057} 1058 1059static int atk_ec_enabled(struct atk_data *data) 1060{ 1061 struct device *dev = &data->acpi_dev->dev; 1062 union acpi_object *obj; 1063 struct atk_acpi_ret_buffer *buf; 1064 int err; 1065 1066 obj = atk_gitm(data, ATK_EC_ID); 1067 if (IS_ERR(obj)) { 1068 dev_err(dev, "Unable to query EC status\n"); 1069 return PTR_ERR(obj); 1070 } 1071 buf = (struct atk_acpi_ret_buffer *)obj->buffer.pointer; 1072 1073 if (buf->flags == 0) { 1074 dev_err(dev, "Unable to query EC status\n"); 1075 err = -EIO; 1076 } else { 1077 err = (buf->value != 0); 1078 dev_dbg(dev, "EC is %sabled\n", 1079 err ? "en" : "dis"); 1080 } 1081 1082 ACPI_FREE(obj); 1083 return err; 1084} 1085 1086static int atk_ec_ctl(struct atk_data *data, int enable) 1087{ 1088 struct device *dev = &data->acpi_dev->dev; 1089 union acpi_object *obj; 1090 struct atk_acpi_input_buf sitm; 1091 struct atk_acpi_ret_buffer *ec_ret; 1092 int err = 0; 1093 1094 sitm.id = ATK_EC_ID; 1095 sitm.param1 = enable; 1096 sitm.param2 = 0; 1097 1098 obj = atk_sitm(data, &sitm); 1099 if (IS_ERR(obj)) { 1100 dev_err(dev, "Failed to %sable the EC\n", 1101 enable ? "en" : "dis"); 1102 return PTR_ERR(obj); 1103 } 1104 ec_ret = (struct atk_acpi_ret_buffer *)obj->buffer.pointer; 1105 if (ec_ret->flags == 0) { 1106 dev_err(dev, "Failed to %sable the EC\n", 1107 enable ? "en" : "dis"); 1108 err = -EIO; 1109 } else { 1110 dev_info(dev, "EC %sabled\n", 1111 enable ? "en" : "dis"); 1112 } 1113 1114 ACPI_FREE(obj); 1115 return err; 1116} 1117 1118static int atk_enumerate_new_hwmon(struct atk_data *data) 1119{ 1120 struct device *dev = &data->acpi_dev->dev; 1121 union acpi_object *pack; 1122 int err; 1123 int i; 1124 1125 err = atk_ec_present(data); 1126 if (err < 0) 1127 return err; 1128 if (err) { 1129 err = atk_ec_enabled(data); 1130 if (err < 0) 1131 return err; 1132 /* If the EC was disabled we will disable it again on unload */ 1133 data->disable_ec = err; 1134 1135 err = atk_ec_ctl(data, 1); 1136 if (err) { 1137 data->disable_ec = false; 1138 return err; 1139 } 1140 } 1141 1142 dev_dbg(dev, "Enumerating hwmon sensors\n"); 1143 1144 pack = atk_ggrp(data, ATK_MUX_HWMON); 1145 if (IS_ERR(pack)) 1146 return PTR_ERR(pack); 1147 1148 for (i = 0; i < pack->package.count; i++) { 1149 union acpi_object *obj = &pack->package.elements[i]; 1150 1151 atk_add_sensor(data, obj); 1152 } 1153 1154 err = data->voltage_count + data->temperature_count + data->fan_count; 1155 1156 ACPI_FREE(pack); 1157 return err; 1158} 1159 1160static int atk_init_attribute_groups(struct atk_data *data) 1161{ 1162 struct device *dev = &data->acpi_dev->dev; 1163 struct atk_sensor_data *s; 1164 struct attribute **attrs; 1165 int i = 0; 1166 int len = (data->voltage_count + data->temperature_count 1167 + data->fan_count) * 4 + 1; 1168 1169 attrs = devm_kcalloc(dev, len, sizeof(struct attribute *), GFP_KERNEL); 1170 if (!attrs) 1171 return -ENOMEM; 1172 1173 list_for_each_entry(s, &data->sensor_list, list) { 1174 attrs[i++] = &s->input_attr.attr; 1175 attrs[i++] = &s->label_attr.attr; 1176 attrs[i++] = &s->limit1_attr.attr; 1177 attrs[i++] = &s->limit2_attr.attr; 1178 } 1179 1180 data->attr_group.attrs = attrs; 1181 data->attr_groups[0] = &data->attr_group; 1182 1183 return 0; 1184} 1185 1186static int atk_register_hwmon(struct atk_data *data) 1187{ 1188 struct device *dev = &data->acpi_dev->dev; 1189 1190 dev_dbg(dev, "registering hwmon device\n"); 1191 data->hwmon_dev = hwmon_device_register_with_groups(dev, "atk0110", 1192 data, 1193 data->attr_groups); 1194 1195 return PTR_ERR_OR_ZERO(data->hwmon_dev); 1196} 1197 1198static int atk_probe_if(struct atk_data *data) 1199{ 1200 struct device *dev = &data->acpi_dev->dev; 1201 acpi_handle ret; 1202 acpi_status status; 1203 int err = 0; 1204 1205 /* RTMP: read temperature */ 1206 status = acpi_get_handle(data->atk_handle, METHOD_OLD_READ_TMP, &ret); 1207 if (ACPI_SUCCESS(status)) 1208 data->rtmp_handle = ret; 1209 else 1210 dev_dbg(dev, "method " METHOD_OLD_READ_TMP " not found: %s\n", 1211 acpi_format_exception(status)); 1212 1213 /* RVLT: read voltage */ 1214 status = acpi_get_handle(data->atk_handle, METHOD_OLD_READ_VLT, &ret); 1215 if (ACPI_SUCCESS(status)) 1216 data->rvlt_handle = ret; 1217 else 1218 dev_dbg(dev, "method " METHOD_OLD_READ_VLT " not found: %s\n", 1219 acpi_format_exception(status)); 1220 1221 /* RFAN: read fan status */ 1222 status = acpi_get_handle(data->atk_handle, METHOD_OLD_READ_FAN, &ret); 1223 if (ACPI_SUCCESS(status)) 1224 data->rfan_handle = ret; 1225 else 1226 dev_dbg(dev, "method " METHOD_OLD_READ_FAN " not found: %s\n", 1227 acpi_format_exception(status)); 1228 1229 /* Enumeration */ 1230 status = acpi_get_handle(data->atk_handle, METHOD_ENUMERATE, &ret); 1231 if (ACPI_SUCCESS(status)) 1232 data->enumerate_handle = ret; 1233 else 1234 dev_dbg(dev, "method " METHOD_ENUMERATE " not found: %s\n", 1235 acpi_format_exception(status)); 1236 1237 /* De-multiplexer (read) */ 1238 status = acpi_get_handle(data->atk_handle, METHOD_READ, &ret); 1239 if (ACPI_SUCCESS(status)) 1240 data->read_handle = ret; 1241 else 1242 dev_dbg(dev, "method " METHOD_READ " not found: %s\n", 1243 acpi_format_exception(status)); 1244 1245 /* De-multiplexer (write) */ 1246 status = acpi_get_handle(data->atk_handle, METHOD_WRITE, &ret); 1247 if (ACPI_SUCCESS(status)) 1248 data->write_handle = ret; 1249 else 1250 dev_dbg(dev, "method " METHOD_WRITE " not found: %s\n", 1251 acpi_format_exception(status)); 1252 1253 /* 1254 * Check for hwmon methods: first check "old" style methods; note that 1255 * both may be present: in this case we stick to the old interface; 1256 * analysis of multiple DSDTs indicates that when both interfaces 1257 * are present the new one (GGRP/GITM) is not functional. 1258 */ 1259 if (new_if) 1260 dev_info(dev, "Overriding interface detection\n"); 1261 if (data->rtmp_handle && 1262 data->rvlt_handle && data->rfan_handle && !new_if) 1263 data->old_interface = true; 1264 else if (data->enumerate_handle && data->read_handle && 1265 data->write_handle) 1266 data->old_interface = false; 1267 else 1268 err = -ENODEV; 1269 1270 return err; 1271} 1272 1273static int atk_add(struct acpi_device *device) 1274{ 1275 acpi_status ret; 1276 int err; 1277 struct acpi_buffer buf; 1278 union acpi_object *obj; 1279 struct atk_data *data; 1280 1281 dev_dbg(&device->dev, "adding...\n"); 1282 1283 data = devm_kzalloc(&device->dev, sizeof(*data), GFP_KERNEL); 1284 if (!data) 1285 return -ENOMEM; 1286 1287 data->acpi_dev = device; 1288 data->atk_handle = device->handle; 1289 INIT_LIST_HEAD(&data->sensor_list); 1290 data->disable_ec = false; 1291 1292 buf.length = ACPI_ALLOCATE_BUFFER; 1293 ret = acpi_evaluate_object_typed(data->atk_handle, BOARD_ID, NULL, 1294 &buf, ACPI_TYPE_PACKAGE); 1295 if (ret != AE_OK) { 1296 dev_dbg(&device->dev, "atk: method MBIF not found\n"); 1297 } else { 1298 obj = buf.pointer; 1299 if (obj->package.count >= 2) { 1300 union acpi_object *id = &obj->package.elements[1]; 1301 if (id->type == ACPI_TYPE_STRING) 1302 dev_dbg(&device->dev, "board ID = %s\n", 1303 id->string.pointer); 1304 } 1305 ACPI_FREE(buf.pointer); 1306 } 1307 1308 err = atk_probe_if(data); 1309 if (err) { 1310 dev_err(&device->dev, "No usable hwmon interface detected\n"); 1311 goto out; 1312 } 1313 1314 if (data->old_interface) { 1315 dev_dbg(&device->dev, "Using old hwmon interface\n"); 1316 err = atk_enumerate_old_hwmon(data); 1317 } else { 1318 dev_dbg(&device->dev, "Using new hwmon interface\n"); 1319 err = atk_enumerate_new_hwmon(data); 1320 } 1321 if (err < 0) 1322 goto out; 1323 if (err == 0) { 1324 dev_info(&device->dev, 1325 "No usable sensor detected, bailing out\n"); 1326 err = -ENODEV; 1327 goto out; 1328 } 1329 1330 err = atk_init_attribute_groups(data); 1331 if (err) 1332 goto out; 1333 err = atk_register_hwmon(data); 1334 if (err) 1335 goto out; 1336 1337 atk_debugfs_init(data); 1338 1339 device->driver_data = data; 1340 return 0; 1341out: 1342 if (data->disable_ec) 1343 atk_ec_ctl(data, 0); 1344 return err; 1345} 1346 1347static void atk_remove(struct acpi_device *device) 1348{ 1349 struct atk_data *data = device->driver_data; 1350 dev_dbg(&device->dev, "removing...\n"); 1351 1352 device->driver_data = NULL; 1353 1354 atk_debugfs_cleanup(data); 1355 1356 hwmon_device_unregister(data->hwmon_dev); 1357 1358 if (data->disable_ec) { 1359 if (atk_ec_ctl(data, 0)) 1360 dev_err(&device->dev, "Failed to disable EC\n"); 1361 } 1362} 1363 1364static int __init atk0110_init(void) 1365{ 1366 int ret; 1367 1368 /* Make sure it's safe to access the device through ACPI */ 1369 if (!acpi_resources_are_enforced()) { 1370 pr_err("Resources not safely usable due to acpi_enforce_resources kernel parameter\n"); 1371 return -EBUSY; 1372 } 1373 1374 if (dmi_check_system(atk_force_new_if)) 1375 new_if = true; 1376 1377 ret = acpi_bus_register_driver(&atk_driver); 1378 if (ret) 1379 pr_info("acpi_bus_register_driver failed: %d\n", ret); 1380 1381 return ret; 1382} 1383 1384static void __exit atk0110_exit(void) 1385{ 1386 acpi_bus_unregister_driver(&atk_driver); 1387} 1388 1389module_init(atk0110_init); 1390module_exit(atk0110_exit); 1391 1392MODULE_LICENSE("GPL"); 1393