root/drivers/hwmon/asus_atk0110.c

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DEFINITIONS

This source file includes following definitions.
  1. atk_input_show
  2. atk_label_show
  3. atk_limit1_show
  4. atk_limit2_show
  5. atk_init_attribute
  6. atk_get_pack_member
  7. validate_hwmon_pack
  8. atk_sensor_type
  9. atk_print_sensor
  10. atk_read_value_old
  11. atk_ggrp
  12. atk_gitm
  13. atk_sitm
  14. atk_read_value_new
  15. atk_read_value
  16. atk_debugfs_gitm_get
  17. atk_acpi_print
  18. atk_pack_print
  19. atk_debugfs_ggrp_open
  20. atk_debugfs_ggrp_read
  21. atk_debugfs_ggrp_release
  22. atk_debugfs_init
  23. atk_debugfs_cleanup
  24. atk_debugfs_init
  25. atk_debugfs_cleanup
  26. atk_add_sensor
  27. atk_enumerate_old_hwmon
  28. atk_ec_present
  29. atk_ec_enabled
  30. atk_ec_ctl
  31. atk_enumerate_new_hwmon
  32. atk_init_attribute_groups
  33. atk_register_hwmon
  34. atk_probe_if
  35. atk_add
  36. atk_remove
  37. atk0110_init
  38. atk0110_exit

   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 
  23 static bool new_if;
  24 module_param(new_if, bool, 0);
  25 MODULE_PARM_DESC(new_if, "Override detection heuristic and force the use of the new ATK0110 interface");
  26 
  27 static 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 
  79 enum 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 
 106 struct 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 
 138 typedef ssize_t (*sysfs_show_func)(struct device *dev,
 139                         struct device_attribute *attr, char *buf);
 140 
 141 static const struct acpi_device_id atk_ids[] = {
 142         {ATK_HID, 0},
 143         {"", 0},
 144 };
 145 MODULE_DEVICE_TABLE(acpi, atk_ids);
 146 
 147 #define ATTR_NAME_SIZE 16 /* Worst case is "tempN_input" */
 148 
 149 struct 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  */
 176 struct atk_acpi_ret_buffer {
 177         u32 flags;
 178         u32 value;
 179         u8 data[];
 180 };
 181 
 182 /* Input buffer used for GITM and SITM methods */
 183 struct atk_acpi_input_buf {
 184         u32 id;
 185         u32 param1;
 186         u32 param2;
 187 };
 188 
 189 static int atk_add(struct acpi_device *device);
 190 static int atk_remove(struct acpi_device *device);
 191 static void atk_print_sensor(struct atk_data *data, union acpi_object *obj);
 192 static int atk_read_value(struct atk_sensor_data *sensor, u64 *value);
 193 
 194 static 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 
 216 static 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 
 234 static 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 
 242 static 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 
 254 static 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 
 266 static 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 
 277 static 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  */
 327 static 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
 397 static 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 
 421 static 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 
 448 static 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, &params, 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 
 487 static 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, &params, &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 
 523 static 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, &params,
 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 
 564 static 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, &params,
 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 
 601 static 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;
 626 out:
 627         ACPI_FREE(obj);
 628         return err;
 629 }
 630 
 631 static 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
 657 static 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 
 684 DEFINE_DEBUGFS_ATTRIBUTE(atk_debugfs_gitm, atk_debugfs_gitm_get, NULL,
 685                          "0x%08llx\n");
 686 
 687 static 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 
 703 static 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 
 719 static 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 
 767 static 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 
 776 static int atk_debugfs_ggrp_release(struct inode *inode, struct file *file)
 777 {
 778         kfree(file->private_data);
 779         return 0;
 780 }
 781 
 782 static 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 
 789 static 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 
 804 static void atk_debugfs_cleanup(struct atk_data *data)
 805 {
 806         debugfs_remove_recursive(data->debugfs.root);
 807 }
 808 
 809 #else /* CONFIG_DEBUG_FS */
 810 
 811 static void atk_debugfs_init(struct atk_data *data)
 812 {
 813 }
 814 
 815 static void atk_debugfs_cleanup(struct atk_data *data)
 816 {
 817 }
 818 #endif
 819 
 820 static 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 
 938 static 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 
1013 static 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 
1059 static 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 
1086 static 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 
1118 static 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 
1160 static 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 
1186 static 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 
1198 static 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 
1273 static 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;
1341 out:
1342         if (data->disable_ec)
1343                 atk_ec_ctl(data, 0);
1344         return err;
1345 }
1346 
1347 static int 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         return 0;
1364 }
1365 
1366 static int __init atk0110_init(void)
1367 {
1368         int ret;
1369 
1370         /* Make sure it's safe to access the device through ACPI */
1371         if (!acpi_resources_are_enforced()) {
1372                 pr_err("Resources not safely usable due to acpi_enforce_resources kernel parameter\n");
1373                 return -EBUSY;
1374         }
1375 
1376         if (dmi_check_system(atk_force_new_if))
1377                 new_if = true;
1378 
1379         ret = acpi_bus_register_driver(&atk_driver);
1380         if (ret)
1381                 pr_info("acpi_bus_register_driver failed: %d\n", ret);
1382 
1383         return ret;
1384 }
1385 
1386 static void __exit atk0110_exit(void)
1387 {
1388         acpi_bus_unregister_driver(&atk_driver);
1389 }
1390 
1391 module_init(atk0110_init);
1392 module_exit(atk0110_exit);
1393 
1394 MODULE_LICENSE("GPL");

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