drivers/hwmon/asus_atk0110.c

   1 /*
   2  * Copyright (C) 2007-2009 Luca Tettamanti <kronos.it@gmail.com>
   3  *
   4  * This file is released under the GPLv2
   5  * See COPYING in the top level directory of the kernel tree.
   6  */
   7
   8 #include <linux/kernel.h>
   9 #include <linux/hwmon.h>
  10 #include <linux/list.h>
  11 #include <linux/module.h>
  12
  13 #include <acpi/acpi.h>
  14 #include <acpi/acpixf.h>
  15 #include <acpi/acpi_drivers.h>
  16 #include <acpi/acpi_bus.h>
  17
  18
  19 #define ATK_HID "ATK0110"
  20
  21 /* Minimum time between readings, enforced in order to avoid
  22  * hogging the CPU.
  23  */
  24 #define CACHE_TIME              HZ
  25
  26 #define BOARD_ID                "MBIF"
  27 #define METHOD_ENUMERATE        "GGRP"
  28 #define METHOD_READ             "GITM"
  29 #define METHOD_WRITE            "SITM"
  30 #define METHOD_OLD_READ_TMP     "RTMP"
  31 #define METHOD_OLD_READ_VLT     "RVLT"
  32 #define METHOD_OLD_READ_FAN     "RFAN"
  33 #define METHOD_OLD_ENUM_TMP     "TSIF"
  34 #define METHOD_OLD_ENUM_VLT     "VSIF"
  35 #define METHOD_OLD_ENUM_FAN     "FSIF"
  36
  37 #define ATK_MUX_HWMON           0x00000006ULL
  38
  39 #define ATK_CLASS_MASK          0xff000000ULL
  40 #define ATK_CLASS_FREQ_CTL      0x03000000ULL
  41 #define ATK_CLASS_FAN_CTL       0x04000000ULL
  42 #define ATK_CLASS_HWMON         0x06000000ULL
  43
  44 #define ATK_TYPE_MASK           0x00ff0000ULL
  45 #define HWMON_TYPE_VOLT         0x00020000ULL
  46 #define HWMON_TYPE_TEMP         0x00030000ULL
  47 #define HWMON_TYPE_FAN          0x00040000ULL
  48
  49 #define HWMON_SENSOR_ID_MASK    0x0000ffffULL
  50
  51 enum atk_pack_member {
  52         HWMON_PACK_FLAGS,
  53         HWMON_PACK_NAME,
  54         HWMON_PACK_LIMIT1,
  55         HWMON_PACK_LIMIT2,
  56         HWMON_PACK_ENABLE
  57 };
  58
  59 /* New package format */
  60 #define _HWMON_NEW_PACK_SIZE    7
  61 #define _HWMON_NEW_PACK_FLAGS   0
  62 #define _HWMON_NEW_PACK_NAME    1
  63 #define _HWMON_NEW_PACK_UNK1    2
  64 #define _HWMON_NEW_PACK_UNK2    3
  65 #define _HWMON_NEW_PACK_LIMIT1  4
  66 #define _HWMON_NEW_PACK_LIMIT2  5
  67 #define _HWMON_NEW_PACK_ENABLE  6
  68
  69 /* Old package format */
  70 #define _HWMON_OLD_PACK_SIZE    5
  71 #define _HWMON_OLD_PACK_FLAGS   0
  72 #define _HWMON_OLD_PACK_NAME    1
  73 #define _HWMON_OLD_PACK_LIMIT1  2
  74 #define _HWMON_OLD_PACK_LIMIT2  3
  75 #define _HWMON_OLD_PACK_ENABLE  4
  76
  77
  78 struct atk_data {
  79         struct device *hwmon_dev;
  80         acpi_handle atk_handle;
  81         struct acpi_device *acpi_dev;
  82
  83         bool old_interface;
  84
  85         /* old interface */
  86         acpi_handle rtmp_handle;
  87         acpi_handle rvlt_handle;
  88         acpi_handle rfan_handle;
  89         /* new inteface */
  90         acpi_handle enumerate_handle;
  91         acpi_handle read_handle;
  92
  93         int voltage_count;
  94         int temperature_count;
  95         int fan_count;
  96         struct list_head sensor_list;
  97 };
  98
  99
 100 typedef ssize_t (*sysfs_show_func)(struct device *dev,
 101                         struct device_attribute *attr, char *buf);
 102
 103 static const struct acpi_device_id atk_ids[] = {
 104         {ATK_HID, 0},
 105         {"", 0},
 106 };
 107 MODULE_DEVICE_TABLE(acpi, atk_ids);
 108
 109 #define ATTR_NAME_SIZE 16 /* Worst case is "tempN_input" */
 110
 111 struct atk_sensor_data {
 112         struct list_head list;
 113         struct atk_data *data;
 114         struct device_attribute label_attr;
 115         struct device_attribute input_attr;
 116         struct device_attribute limit1_attr;
 117         struct device_attribute limit2_attr;
 118         char label_attr_name[ATTR_NAME_SIZE];
 119         char input_attr_name[ATTR_NAME_SIZE];
 120         char limit1_attr_name[ATTR_NAME_SIZE];
 121         char limit2_attr_name[ATTR_NAME_SIZE];
 122         u64 id;
 123         u64 type;
 124         u64 limit1;
 125         u64 limit2;
 126         u64 cached_value;
 127         unsigned long last_updated; /* in jiffies */
 128         bool is_valid;
 129         char const *acpi_name;
 130 };
 131
 132 struct atk_acpi_buffer_u64 {
 133         union acpi_object buf;
 134         u64 value;
 135 };
 136
 137 static int atk_add(struct acpi_device *device);
 138 static int atk_remove(struct acpi_device *device, int type);
 139 static void atk_print_sensor(struct atk_data *data, union acpi_object *obj);
 140 static int atk_read_value(struct atk_sensor_data *sensor, u64 *value);
 141 static void atk_free_sensors(struct atk_data *data);
 142
 143 static struct acpi_driver atk_driver = {
 144         .name   = ATK_HID,
 145         .class  = "hwmon",
 146         .ids    = atk_ids,
 147         .ops    = {
 148                 .add    = atk_add,
 149                 .remove = atk_remove,
 150         },
 151 };
 152
 153 #define input_to_atk_sensor(attr) \
 154         container_of(attr, struct atk_sensor_data, input_attr)
 155
 156 #define label_to_atk_sensor(attr) \
 157         container_of(attr, struct atk_sensor_data, label_attr)
 158
 159 #define limit1_to_atk_sensor(attr) \
 160         container_of(attr, struct atk_sensor_data, limit1_attr)
 161
 162 #define limit2_to_atk_sensor(attr) \
 163         container_of(attr, struct atk_sensor_data, limit2_attr)
 164
 165 static ssize_t atk_input_show(struct device *dev,
 166                 struct device_attribute *attr, char *buf)
 167 {
 168         struct atk_sensor_data *s = input_to_atk_sensor(attr);
 169         u64 value;
 170         int err;
 171
 172         err = atk_read_value(s, &value);
 173         if (err)
 174                 return err;
 175
 176         if (s->type == HWMON_TYPE_TEMP)
 177                 /* ACPI returns decidegree */
 178                 value *= 100;
 179
 180         return sprintf(buf, "%llu\n", value);
 181 }
 182
 183 static ssize_t atk_label_show(struct device *dev,
 184                 struct device_attribute *attr, char *buf)
 185 {
 186         struct atk_sensor_data *s = label_to_atk_sensor(attr);
 187
 188         return sprintf(buf, "%s\n", s->acpi_name);
 189 }
 190
 191 static ssize_t atk_limit1_show(struct device *dev,
 192                 struct device_attribute *attr, char *buf)
 193 {
 194         struct atk_sensor_data *s = limit1_to_atk_sensor(attr);
 195         u64 value = s->limit1;
 196
 197         if (s->type == HWMON_TYPE_TEMP)
 198                 value *= 100;
 199
 200         return sprintf(buf, "%lld\n", value);
 201 }
 202
 203 static ssize_t atk_limit2_show(struct device *dev,
 204                 struct device_attribute *attr, char *buf)
 205 {
 206         struct atk_sensor_data *s = limit2_to_atk_sensor(attr);
 207         u64 value = s->limit2;
 208
 209         if (s->type == HWMON_TYPE_TEMP)
 210                 value *= 100;
 211
 212         return sprintf(buf, "%lld\n", value);
 213 }
 214
 215 static ssize_t atk_name_show(struct device *dev,
 216                                 struct device_attribute *attr, char *buf)
 217 {
 218         return sprintf(buf, "atk0110\n");
 219 }
 220 static struct device_attribute atk_name_attr =
 221                 __ATTR(name, 0444, atk_name_show, NULL);
 222
 223 static void atk_init_attribute(struct device_attribute *attr, char *name,
 224                 sysfs_show_func show)
 225 {
 226         attr->attr.name = name;
 227         attr->attr.mode = 0444;
 228         attr->show = show;
 229         attr->store = NULL;
 230 }
 231
 232
 233 static union acpi_object *atk_get_pack_member(struct atk_data *data,
 234                                                 union acpi_object *pack,
 235                                                 enum atk_pack_member m)
 236 {
 237         bool old_if = data->old_interface;
 238         int offset;
 239
 240         switch (m) {
 241         case HWMON_PACK_FLAGS:
 242                 offset = old_if ? _HWMON_OLD_PACK_FLAGS : _HWMON_NEW_PACK_FLAGS;
 243                 break;
 244         case HWMON_PACK_NAME:
 245                 offset = old_if ? _HWMON_OLD_PACK_NAME : _HWMON_NEW_PACK_NAME;
 246                 break;
 247         case HWMON_PACK_LIMIT1:
 248                 offset = old_if ? _HWMON_OLD_PACK_LIMIT1 :
 249                                   _HWMON_NEW_PACK_LIMIT1;
 250                 break;
 251         case HWMON_PACK_LIMIT2:
 252                 offset = old_if ? _HWMON_OLD_PACK_LIMIT2 :
 253                                   _HWMON_NEW_PACK_LIMIT2;
 254                 break;
 255         case HWMON_PACK_ENABLE:
 256                 offset = old_if ? _HWMON_OLD_PACK_ENABLE :
 257                                   _HWMON_NEW_PACK_ENABLE;
 258                 break;
 259         default:
 260                 return NULL;
 261         }
 262
 263         return &pack->package.elements[offset];
 264 }
 265
 266
 267 /* New package format is:
 268  * - flag (int)
 269  *      class - used for de-muxing the request to the correct GITn
 270  *      type (volt, temp, fan)
 271  *      sensor id |
 272  *      sensor id - used for de-muxing the request _inside_ the GITn
 273  * - name (str)
 274  * - unknown (int)
 275  * - unknown (int)
 276  * - limit1 (int)
 277  * - limit2 (int)
 278  * - enable (int)
 279  *
 280  * The old package has the same format but it's missing the two unknown fields.
 281  */
 282 static int validate_hwmon_pack(struct atk_data *data, union acpi_object *obj)
 283 {
 284         struct device *dev = &data->acpi_dev->dev;
 285         union acpi_object *tmp;
 286         bool old_if = data->old_interface;
 287         int const expected_size = old_if ? _HWMON_OLD_PACK_SIZE :
 288                                            _HWMON_NEW_PACK_SIZE;
 289
 290         if (obj->type != ACPI_TYPE_PACKAGE) {
 291                 dev_warn(dev, "Invalid type: %d\n", obj->type);
 292                 return -EINVAL;
 293         }
 294
 295         if (obj->package.count != expected_size) {
 296                 dev_warn(dev, "Invalid package size: %d, expected: %d\n",
 297                                 obj->package.count, expected_size);
 298                 return -EINVAL;
 299         }
 300
 301         tmp = atk_get_pack_member(data, obj, HWMON_PACK_FLAGS);
 302         if (tmp->type != ACPI_TYPE_INTEGER) {
 303                 dev_warn(dev, "Invalid type (flag): %d\n", tmp->type);
 304                 return -EINVAL;
 305         }
 306
 307         tmp = atk_get_pack_member(data, obj, HWMON_PACK_NAME);
 308         if (tmp->type != ACPI_TYPE_STRING) {
 309                 dev_warn(dev, "Invalid type (name): %d\n", tmp->type);
 310                 return -EINVAL;
 311         }
 312
 313         /* Don't check... we don't know what they're useful for anyway */
 314 #if 0
 315         tmp = &obj->package.elements[HWMON_PACK_UNK1];
 316         if (tmp->type != ACPI_TYPE_INTEGER) {
 317                 dev_warn(dev, "Invalid type (unk1): %d\n", tmp->type);
 318                 return -EINVAL;
 319         }
 320
 321         tmp = &obj->package.elements[HWMON_PACK_UNK2];
 322         if (tmp->type != ACPI_TYPE_INTEGER) {
 323                 dev_warn(dev, "Invalid type (unk2): %d\n", tmp->type);
 324                 return -EINVAL;
 325         }
 326 #endif
 327
 328         tmp = atk_get_pack_member(data, obj, HWMON_PACK_LIMIT1);
 329         if (tmp->type != ACPI_TYPE_INTEGER) {
 330                 dev_warn(dev, "Invalid type (limit1): %d\n", tmp->type);
 331                 return -EINVAL;
 332         }
 333
 334         tmp = atk_get_pack_member(data, obj, HWMON_PACK_LIMIT2);
 335         if (tmp->type != ACPI_TYPE_INTEGER) {
 336                 dev_warn(dev, "Invalid type (limit2): %d\n", tmp->type);
 337                 return -EINVAL;
 338         }
 339
 340         tmp = atk_get_pack_member(data, obj, HWMON_PACK_ENABLE);
 341         if (tmp->type != ACPI_TYPE_INTEGER) {
 342                 dev_warn(dev, "Invalid type (enable): %d\n", tmp->type);
 343                 return -EINVAL;
 344         }
 345
 346         atk_print_sensor(data, obj);
 347
 348         return 0;
 349 }
 350
 351 static char const *atk_sensor_type(union acpi_object *flags)
 352 {
 353         u64 type = flags->integer.value & ATK_TYPE_MASK;
 354         char const *what;
 355
 356         switch (type) {
 357         case HWMON_TYPE_VOLT:
 358                 what = "voltage";
 359                 break;
 360         case HWMON_TYPE_TEMP:
 361                 what = "temperature";
 362                 break;
 363         case HWMON_TYPE_FAN:
 364                 what = "fan";
 365                 break;
 366         default:
 367                 what = "unknown";
 368                 break;
 369         }
 370
 371         return what;
 372 }
 373
 374 static void atk_print_sensor(struct atk_data *data, union acpi_object *obj)
 375 {
 376 #ifdef DEBUG
 377         struct device *dev = &data->acpi_dev->dev;
 378         union acpi_object *flags;
 379         union acpi_object *name;
 380         union acpi_object *limit1;
 381         union acpi_object *limit2;
 382         union acpi_object *enable;
 383         char const *what;
 384
 385         flags = atk_get_pack_member(data, obj, HWMON_PACK_FLAGS);
 386         name = atk_get_pack_member(data, obj, HWMON_PACK_NAME);
 387         limit1 = atk_get_pack_member(data, obj, HWMON_PACK_LIMIT1);
 388         limit2 = atk_get_pack_member(data, obj, HWMON_PACK_LIMIT2);
 389         enable = atk_get_pack_member(data, obj, HWMON_PACK_ENABLE);
 390
 391         what = atk_sensor_type(flags);
 392
 393         dev_dbg(dev, "%s: %#llx %s [%llu-%llu] %s\n", what,
 394                         flags->integer.value,
 395                         name->string.pointer,
 396                         limit1->integer.value, limit2->integer.value,
 397                         enable->integer.value ? "enabled" : "disabled");
 398 #endif
 399 }
 400
 401 static int atk_read_value_old(struct atk_sensor_data *sensor, u64 *value)
 402 {
 403         struct atk_data *data = sensor->data;
 404         struct device *dev = &data->acpi_dev->dev;
 405         struct acpi_object_list params;
 406         union acpi_object id;
 407         acpi_status status;
 408         acpi_handle method;
 409
 410         switch (sensor->type) {
 411         case HWMON_TYPE_VOLT:
 412                 method = data->rvlt_handle;
 413                 break;
 414         case HWMON_TYPE_TEMP:
 415                 method = data->rtmp_handle;
 416                 break;
 417         case HWMON_TYPE_FAN:
 418                 method = data->rfan_handle;
 419                 break;
 420         default:
 421                 return -EINVAL;
 422         }
 423
 424         id.type = ACPI_TYPE_INTEGER;
 425         id.integer.value = sensor->id;
 426
 427         params.count = 1;
 428         params.pointer = &id;
 429
 430         status = acpi_evaluate_integer(method, NULL, &params, value);
 431         if (status != AE_OK) {
 432                 dev_warn(dev, "%s: ACPI exception: %s\n", __func__,
 433                                 acpi_format_exception(status));
 434                 return -EIO;
 435         }
 436
 437         return 0;
 438 }
 439
 440 static int atk_read_value_new(struct atk_sensor_data *sensor, u64 *value)
 441 {
 442         struct atk_data *data = sensor->data;
 443         struct device *dev = &data->acpi_dev->dev;
 444         struct acpi_object_list params;
 445         struct acpi_buffer ret;
 446         union acpi_object id;
 447         struct atk_acpi_buffer_u64 tmp;
 448         acpi_status status;
 449
 450         id.type = ACPI_TYPE_INTEGER;
 451         id.integer.value = sensor->id;
 452
 453         params.count = 1;
 454         params.pointer = &id;
 455
 456         tmp.buf.type = ACPI_TYPE_BUFFER;
 457         tmp.buf.buffer.pointer = (u8 *)&tmp.value;
 458         tmp.buf.buffer.length = sizeof(u64);
 459         ret.length = sizeof(tmp);
 460         ret.pointer = &tmp;
 461
 462         status = acpi_evaluate_object_typed(data->read_handle, NULL, &params,
 463                         &ret, ACPI_TYPE_BUFFER);
 464         if (status != AE_OK) {
 465                 dev_warn(dev, "%s: ACPI exception: %s\n", __func__,
 466                                 acpi_format_exception(status));
 467                 return -EIO;
 468         }
 469
 470         /* Return buffer format:
 471          * [0-3] "value" is valid flag
 472          * [4-7] value
 473          */
 474         if (!(tmp.value & 0xffffffff)) {
 475                 /* The reading is not valid, possible causes:
 476                  * - sensor failure
 477                  * - enumeration was FUBAR (and we didn't notice)
 478                  */
 479                 dev_info(dev, "Failure: %#llx\n", tmp.value);
 480                 return -EIO;
 481         }
 482
 483         *value = (tmp.value & 0xffffffff00000000ULL) >> 32;
 484
 485         return 0;
 486 }
 487
 488 static int atk_read_value(struct atk_sensor_data *sensor, u64 *value)
 489 {
 490         int err;
 491
 492         if (!sensor->is_valid ||
 493             time_after(jiffies, sensor->last_updated + CACHE_TIME)) {
 494                 if (sensor->data->old_interface)
 495                         err = atk_read_value_old(sensor, value);
 496                 else
 497                         err = atk_read_value_new(sensor, value);
 498
 499                 sensor->is_valid = true;
 500                 sensor->last_updated = jiffies;
 501                 sensor->cached_value = *value;
 502         } else {
 503                 *value = sensor->cached_value;
 504                 err = 0;
 505         }
 506
 507         return err;
 508 }
 509
 510 static int atk_add_sensor(struct atk_data *data, union acpi_object *obj)
 511 {
 512         struct device *dev = &data->acpi_dev->dev;
 513         union acpi_object *flags;
 514         union acpi_object *name;
 515         union acpi_object *limit1;
 516         union acpi_object *limit2;
 517         union acpi_object *enable;
 518         struct atk_sensor_data *sensor;
 519         char const *base_name;
 520         char const *limit1_name;
 521         char const *limit2_name;
 522         u64 type;
 523         int err;
 524         int *num;
 525         int start;
 526
 527         if (obj->type != ACPI_TYPE_PACKAGE) {
 528                 /* wft is this? */
 529                 dev_warn(dev, "Unknown type for ACPI object: (%d)\n",
 530                                 obj->type);
 531                 return -EINVAL;
 532         }
 533
 534         err = validate_hwmon_pack(data, obj);
 535         if (err)
 536                 return err;
 537
 538         /* Ok, we have a valid hwmon package */
 539         type = atk_get_pack_member(data, obj, HWMON_PACK_FLAGS)->integer.value
 540                & ATK_TYPE_MASK;
 541
 542         switch (type) {
 543         case HWMON_TYPE_VOLT:
 544                 base_name = "in";
 545                 limit1_name = "min";
 546                 limit2_name = "max";
 547                 num = &data->voltage_count;
 548                 start = 0;
 549                 break;
 550         case HWMON_TYPE_TEMP:
 551                 base_name = "temp";
 552                 limit1_name = "max";
 553                 limit2_name = "crit";
 554                 num = &data->temperature_count;
 555                 start = 1;
 556                 break;
 557         case HWMON_TYPE_FAN:
 558                 base_name = "fan";
 559                 limit1_name = "min";
 560                 limit2_name = "max";
 561                 num = &data->fan_count;
 562                 start = 1;
 563                 break;
 564         default:
 565                 dev_warn(dev, "Unknown sensor type: %#llx\n", type);
 566                 return -EINVAL;
 567         }
 568
 569         enable = atk_get_pack_member(data, obj, HWMON_PACK_ENABLE);
 570         if (!enable->integer.value)
 571                 /* sensor is disabled */
 572                 return 0;
 573
 574         flags = atk_get_pack_member(data, obj, HWMON_PACK_FLAGS);
 575         name = atk_get_pack_member(data, obj, HWMON_PACK_NAME);
 576         limit1 = atk_get_pack_member(data, obj, HWMON_PACK_LIMIT1);
 577         limit2 = atk_get_pack_member(data, obj, HWMON_PACK_LIMIT2);
 578
 579         sensor = kzalloc(sizeof(*sensor), GFP_KERNEL);
 580         if (!sensor)
 581                 return -ENOMEM;
 582
 583         sensor->acpi_name = kstrdup(name->string.pointer, GFP_KERNEL);
 584         if (!sensor->acpi_name) {
 585                 err = -ENOMEM;
 586                 goto out;
 587         }
 588
 589         INIT_LIST_HEAD(&sensor->list);
 590         sensor->type = type;
 591         sensor->data = data;
 592         sensor->id = flags->integer.value;
 593         sensor->limit1 = limit1->integer.value;
 594         sensor->limit2 = limit2->integer.value;
 595
 596         snprintf(sensor->input_attr_name, ATTR_NAME_SIZE,
 597                         "%s%d_input", base_name, start + *num);
 598         atk_init_attribute(&sensor->input_attr,
 599                         sensor->input_attr_name,
 600                         atk_input_show);
 601
 602         snprintf(sensor->label_attr_name, ATTR_NAME_SIZE,
 603                         "%s%d_label", base_name, start + *num);
 604         atk_init_attribute(&sensor->label_attr,
 605                         sensor->label_attr_name,
 606                         atk_label_show);
 607
 608         snprintf(sensor->limit1_attr_name, ATTR_NAME_SIZE,
 609                         "%s%d_%s", base_name, start + *num, limit1_name);
 610         atk_init_attribute(&sensor->limit1_attr,
 611                         sensor->limit1_attr_name,
 612                         atk_limit1_show);
 613
 614         snprintf(sensor->limit2_attr_name, ATTR_NAME_SIZE,
 615                         "%s%d_%s", base_name, start + *num, limit2_name);
 616         atk_init_attribute(&sensor->limit2_attr,
 617                         sensor->limit2_attr_name,
 618                         atk_limit2_show);
 619
 620         list_add(&sensor->list, &data->sensor_list);
 621         (*num)++;
 622
 623         return 1;
 624 out:
 625         kfree(sensor->acpi_name);
 626         kfree(sensor);
 627         return err;
 628 }
 629
 630 static int atk_enumerate_old_hwmon(struct atk_data *data)
 631 {
 632         struct device *dev = &data->acpi_dev->dev;
 633         struct acpi_buffer buf;
 634         union acpi_object *pack;
 635         acpi_status status;
 636         int i, ret;
 637         int count = 0;
 638
 639         /* Voltages */
 640         buf.length = ACPI_ALLOCATE_BUFFER;
 641         status = acpi_evaluate_object_typed(data->atk_handle,
 642                         METHOD_OLD_ENUM_VLT, NULL, &buf, ACPI_TYPE_PACKAGE);
 643         if (status != AE_OK) {
 644                 dev_warn(dev, METHOD_OLD_ENUM_VLT ": ACPI exception: %s\n",
 645                                 acpi_format_exception(status));
 646
 647                 return -ENODEV;
 648         }
 649
 650         pack = buf.pointer;
 651         for (i = 1; i < pack->package.count; i++) {
 652                 union acpi_object *obj = &pack->package.elements[i];
 653
 654                 ret = atk_add_sensor(data, obj);
 655                 if (ret > 0)
 656                         count++;
 657         }
 658         ACPI_FREE(buf.pointer);
 659
 660         /* Temperatures */
 661         buf.length = ACPI_ALLOCATE_BUFFER;
 662         status = acpi_evaluate_object_typed(data->atk_handle,
 663                         METHOD_OLD_ENUM_TMP, NULL, &buf, ACPI_TYPE_PACKAGE);
 664         if (status != AE_OK) {
 665                 dev_warn(dev, METHOD_OLD_ENUM_TMP ": ACPI exception: %s\n",
 666                                 acpi_format_exception(status));
 667
 668                 ret = -ENODEV;
 669                 goto cleanup;
 670         }
 671
 672         pack = buf.pointer;
 673         for (i = 1; i < pack->package.count; i++) {
 674                 union acpi_object *obj = &pack->package.elements[i];
 675
 676                 ret = atk_add_sensor(data, obj);
 677                 if (ret > 0)
 678                         count++;
 679         }
 680         ACPI_FREE(buf.pointer);
 681
 682         /* Fans */
 683         buf.length = ACPI_ALLOCATE_BUFFER;
 684         status = acpi_evaluate_object_typed(data->atk_handle,
 685                         METHOD_OLD_ENUM_FAN, NULL, &buf, ACPI_TYPE_PACKAGE);
 686         if (status != AE_OK) {
 687                 dev_warn(dev, METHOD_OLD_ENUM_FAN ": ACPI exception: %s\n",
 688                                 acpi_format_exception(status));
 689
 690                 ret = -ENODEV;
 691                 goto cleanup;
 692         }
 693
 694         pack = buf.pointer;
 695         for (i = 1; i < pack->package.count; i++) {
 696                 union acpi_object *obj = &pack->package.elements[i];
 697
 698                 ret = atk_add_sensor(data, obj);
 699                 if (ret > 0)
 700                         count++;
 701         }
 702         ACPI_FREE(buf.pointer);
 703
 704         return count;
 705 cleanup:
 706         atk_free_sensors(data);
 707         return ret;
 708 }
 709
 710 static int atk_enumerate_new_hwmon(struct atk_data *data)
 711 {
 712         struct device *dev = &data->acpi_dev->dev;
 713         struct acpi_buffer buf;
 714         acpi_status ret;
 715         struct acpi_object_list params;
 716         union acpi_object id;
 717         union acpi_object *pack;
 718         int err;
 719         int i;
 720
 721         dev_dbg(dev, "Enumerating hwmon sensors\n");
 722
 723         id.type = ACPI_TYPE_INTEGER;
 724         id.integer.value = ATK_MUX_HWMON;
 725         params.count = 1;
 726         params.pointer = &id;
 727
 728         buf.length = ACPI_ALLOCATE_BUFFER;
 729         ret = acpi_evaluate_object_typed(data->enumerate_handle, NULL, &params,
 730                         &buf, ACPI_TYPE_PACKAGE);
 731         if (ret != AE_OK) {
 732                 dev_warn(dev, METHOD_ENUMERATE ": ACPI exception: %s\n",
 733                                 acpi_format_exception(ret));
 734                 return -ENODEV;
 735         }
 736
 737         /* Result must be a package */
 738         pack = buf.pointer;
 739
 740         if (pack->package.count < 1) {
 741                 dev_dbg(dev, "%s: hwmon package is too small: %d\n", __func__,
 742                                 pack->package.count);
 743                 err = -EINVAL;
 744                 goto out;
 745         }
 746
 747         for (i = 0; i < pack->package.count; i++) {
 748                 union acpi_object *obj = &pack->package.elements[i];
 749
 750                 atk_add_sensor(data, obj);
 751         }
 752
 753         err = data->voltage_count + data->temperature_count + data->fan_count;
 754
 755 out:
 756         ACPI_FREE(buf.pointer);
 757         return err;
 758 }
 759
 760 static int atk_create_files(struct atk_data *data)
 761 {
 762         struct atk_sensor_data *s;
 763         int err;
 764
 765         list_for_each_entry(s, &data->sensor_list, list) {
 766                 err = device_create_file(data->hwmon_dev, &s->input_attr);
 767                 if (err)
 768                         return err;
 769                 err = device_create_file(data->hwmon_dev, &s->label_attr);
 770                 if (err)
 771                         return err;
 772                 err = device_create_file(data->hwmon_dev, &s->limit1_attr);
 773                 if (err)
 774                         return err;
 775                 err = device_create_file(data->hwmon_dev, &s->limit2_attr);
 776                 if (err)
 777                         return err;
 778         }
 779
 780         err = device_create_file(data->hwmon_dev, &atk_name_attr);
 781
 782         return err;
 783 }
 784
 785 static void atk_remove_files(struct atk_data *data)
 786 {
 787         struct atk_sensor_data *s;
 788
 789         list_for_each_entry(s, &data->sensor_list, list) {
 790                 device_remove_file(data->hwmon_dev, &s->input_attr);
 791                 device_remove_file(data->hwmon_dev, &s->label_attr);
 792                 device_remove_file(data->hwmon_dev, &s->limit1_attr);
 793                 device_remove_file(data->hwmon_dev, &s->limit2_attr);
 794         }
 795         device_remove_file(data->hwmon_dev, &atk_name_attr);
 796 }
 797
 798 static void atk_free_sensors(struct atk_data *data)
 799 {
 800         struct list_head *head = &data->sensor_list;
 801         struct atk_sensor_data *s, *tmp;
 802
 803         list_for_each_entry_safe(s, tmp, head, list) {
 804                 kfree(s->acpi_name);
 805                 kfree(s);
 806         }
 807 }
 808
 809 static int atk_register_hwmon(struct atk_data *data)
 810 {
 811         struct device *dev = &data->acpi_dev->dev;
 812         int err;
 813
 814         dev_dbg(dev, "registering hwmon device\n");
 815         data->hwmon_dev = hwmon_device_register(dev);
 816         if (IS_ERR(data->hwmon_dev))
 817                 return PTR_ERR(data->hwmon_dev);
 818
 819         dev_dbg(dev, "populating sysfs directory\n");
 820         err = atk_create_files(data);
 821         if (err)
 822                 goto remove;
 823
 824         return 0;
 825 remove:
 826         /* Cleanup the registered files */
 827         atk_remove_files(data);
 828         hwmon_device_unregister(data->hwmon_dev);
 829         return err;
 830 }
 831
 832 static int atk_check_old_if(struct atk_data *data)
 833 {
 834         struct device *dev = &data->acpi_dev->dev;
 835         acpi_handle ret;
 836         acpi_status status;
 837
 838         /* RTMP: read temperature */
 839         status = acpi_get_handle(data->atk_handle, METHOD_OLD_READ_TMP, &ret);
 840         if (status != AE_OK) {
 841                 dev_dbg(dev, "method " METHOD_OLD_READ_TMP " not found: %s\n",
 842                                 acpi_format_exception(status));
 843                 return -ENODEV;
 844         }
 845         data->rtmp_handle = ret;
 846
 847         /* RVLT: read voltage */
 848         status = acpi_get_handle(data->atk_handle, METHOD_OLD_READ_VLT, &ret);
 849         if (status != AE_OK) {
 850                 dev_dbg(dev, "method " METHOD_OLD_READ_VLT " not found: %s\n",
 851                                 acpi_format_exception(status));
 852                 return -ENODEV;
 853         }
 854         data->rvlt_handle = ret;
 855
 856         /* RFAN: read fan status */
 857         status = acpi_get_handle(data->atk_handle, METHOD_OLD_READ_FAN, &ret);
 858         if (status != AE_OK) {
 859                 dev_dbg(dev, "method " METHOD_OLD_READ_FAN " not found: %s\n",
 860                                 acpi_format_exception(status));
 861                 return -ENODEV;
 862         }
 863         data->rfan_handle = ret;
 864
 865         return 0;
 866 }
 867
 868 static int atk_check_new_if(struct atk_data *data)
 869 {
 870         struct device *dev = &data->acpi_dev->dev;
 871         acpi_handle ret;
 872         acpi_status status;
 873
 874         /* Enumeration */
 875         status = acpi_get_handle(data->atk_handle, METHOD_ENUMERATE, &ret);
 876         if (status != AE_OK) {
 877                 dev_dbg(dev, "method " METHOD_ENUMERATE " not found: %s\n",
 878                                 acpi_format_exception(status));
 879                 return -ENODEV;
 880         }
 881         data->enumerate_handle = ret;
 882
 883         /* De-multiplexer (read) */
 884         status = acpi_get_handle(data->atk_handle, METHOD_READ, &ret);
 885         if (status != AE_OK) {
 886                 dev_dbg(dev, "method " METHOD_READ " not found: %s\n",
 887                                 acpi_format_exception(status));
 888                 return -ENODEV;
 889         }
 890         data->read_handle = ret;
 891
 892         return 0;
 893 }
 894
 895 static int atk_add(struct acpi_device *device)
 896 {
 897         acpi_status ret;
 898         int err;
 899         struct acpi_buffer buf;
 900         union acpi_object *obj;
 901         struct atk_data *data;
 902
 903         dev_dbg(&device->dev, "adding...\n");
 904
 905         data = kzalloc(sizeof(*data), GFP_KERNEL);
 906         if (!data)
 907                 return -ENOMEM;
 908
 909         data->acpi_dev = device;
 910         data->atk_handle = device->handle;
 911         INIT_LIST_HEAD(&data->sensor_list);
 912
 913         buf.length = ACPI_ALLOCATE_BUFFER;
 914         ret = acpi_evaluate_object_typed(data->atk_handle, BOARD_ID, NULL,
 915                         &buf, ACPI_TYPE_PACKAGE);
 916         if (ret != AE_OK) {
 917                 dev_dbg(&device->dev, "atk: method MBIF not found\n");
 918                 err = -ENODEV;
 919                 goto out;
 920         }
 921
 922         obj = buf.pointer;
 923         if (obj->package.count >= 2 &&
 924                         obj->package.elements[1].type == ACPI_TYPE_STRING) {
 925                 dev_dbg(&device->dev, "board ID = %s\n",
 926                                 obj->package.elements[1].string.pointer);
 927         }
 928         ACPI_FREE(buf.pointer);
 929
 930         /* Check for hwmon methods: first check "old" style methods; note that
 931          * both may be present: in this case we stick to the old interface;
 932          * analysis of multiple DSDTs indicates that when both interfaces
 933          * are present the new one (GGRP/GITM) is not functional.
 934          */
 935         err = atk_check_old_if(data);
 936         if (!err) {
 937                 dev_dbg(&device->dev, "Using old hwmon interface\n");
 938                 data->old_interface = true;
 939         } else {
 940                 err = atk_check_new_if(data);
 941                 if (err)
 942                         goto out;
 943
 944                 dev_dbg(&device->dev, "Using new hwmon interface\n");
 945                 data->old_interface = false;
 946         }
 947
 948         if (data->old_interface)
 949                 err = atk_enumerate_old_hwmon(data);
 950         else
 951                 err = atk_enumerate_new_hwmon(data);
 952         if (err < 0)
 953                 goto out;
 954         if (err == 0) {
 955                 dev_info(&device->dev,
 956                          "No usable sensor detected, bailing out\n");
 957                 err = -ENODEV;
 958                 goto out;
 959         }
 960
 961         err = atk_register_hwmon(data);
 962         if (err)
 963                 goto cleanup;
 964
 965         device->driver_data = data;
 966         return 0;
 967 cleanup:
 968         atk_free_sensors(data);
 969 out:
 970         kfree(data);
 971         return err;
 972 }
 973
 974 static int atk_remove(struct acpi_device *device, int type)
 975 {
 976         struct atk_data *data = device->driver_data;
 977         dev_dbg(&device->dev, "removing...\n");
 978
 979         device->driver_data = NULL;
 980
 981         atk_remove_files(data);
 982         atk_free_sensors(data);
 983         hwmon_device_unregister(data->hwmon_dev);
 984
 985         kfree(data);
 986
 987         return 0;
 988 }
 989
 990 static int __init atk0110_init(void)
 991 {
 992         int ret;
 993
 994         ret = acpi_bus_register_driver(&atk_driver);
 995         if (ret)
 996                 pr_info("atk: acpi_bus_register_driver failed: %d\n", ret);
 997
 998         return ret;
 999 }
1000
1001 static void __exit atk0110_exit(void)
1002 {
1003         acpi_bus_unregister_driver(&atk_driver);
1004 }
1005
1006 module_init(atk0110_init);
1007 module_exit(atk0110_exit);
1008
1009 MODULE_LICENSE("GPL");