drivers/hwmon/hwmon.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * hwmon.c - part of lm_sensors, Linux kernel modules for hardware monitoring
   4  *
   5  * This file defines the sysfs class "hwmon", for use by sensors drivers.
   6  *
   7  * Copyright (C) 2005 Mark M. Hoffman <mhoffman@lightlink.com>
   8  */
   9
  10 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  11
  12 #include <linux/bitops.h>
  13 #include <linux/device.h>
  14 #include <linux/err.h>
  15 #include <linux/gfp.h>
  16 #include <linux/hwmon.h>
  17 #include <linux/i2c.h>
  18 #include <linux/idr.h>
  19 #include <linux/kstrtox.h>
  20 #include <linux/list.h>
  21 #include <linux/module.h>
  22 #include <linux/pci.h>
  23 #include <linux/property.h>
  24 #include <linux/slab.h>
  25 #include <linux/string.h>
  26 #include <linux/thermal.h>
  27
  28 #define CREATE_TRACE_POINTS
  29 #include <trace/events/hwmon.h>
  30
  31 #define HWMON_ID_PREFIX "hwmon"
  32 #define HWMON_ID_FORMAT HWMON_ID_PREFIX "%d"
  33
  34 struct hwmon_device {
  35         const char *name;
  36         const char *label;
  37         struct device dev;
  38         const struct hwmon_chip_info *chip;
  39         struct list_head tzdata;
  40         struct attribute_group group;
  41         const struct attribute_group **groups;
  42 };
  43
  44 #define to_hwmon_device(d) container_of(d, struct hwmon_device, dev)
  45
  46 #define MAX_SYSFS_ATTR_NAME_LENGTH      32
  47
  48 struct hwmon_device_attribute {
  49         struct device_attribute dev_attr;
  50         const struct hwmon_ops *ops;
  51         enum hwmon_sensor_types type;
  52         u32 attr;
  53         int index;
  54         char name[MAX_SYSFS_ATTR_NAME_LENGTH];
  55 };
  56
  57 #define to_hwmon_attr(d) \
  58         container_of(d, struct hwmon_device_attribute, dev_attr)
  59 #define to_dev_attr(a) container_of(a, struct device_attribute, attr)
  60
  61 /*
  62  * Thermal zone information
  63  */
  64 struct hwmon_thermal_data {
  65         struct list_head node;          /* hwmon tzdata list entry */
  66         struct device *dev;             /* Reference to hwmon device */
  67         int index;                      /* sensor index */
  68         struct thermal_zone_device *tzd;/* thermal zone device */
  69 };
  70
  71 static ssize_t
  72 name_show(struct device *dev, struct device_attribute *attr, char *buf)
  73 {
  74         return sprintf(buf, "%s\n", to_hwmon_device(dev)->name);
  75 }
  76 static DEVICE_ATTR_RO(name);
  77
  78 static ssize_t
  79 label_show(struct device *dev, struct device_attribute *attr, char *buf)
  80 {
  81         return sysfs_emit(buf, "%s\n", to_hwmon_device(dev)->label);
  82 }
  83 static DEVICE_ATTR_RO(label);
  84
  85 static struct attribute *hwmon_dev_attrs[] = {
  86         &dev_attr_name.attr,
  87         &dev_attr_label.attr,
  88         NULL
  89 };
  90
  91 static umode_t hwmon_dev_attr_is_visible(struct kobject *kobj,
  92                                          struct attribute *attr, int n)
  93 {
  94         struct device *dev = kobj_to_dev(kobj);
  95         struct hwmon_device *hdev = to_hwmon_device(dev);
  96
  97         if (attr == &dev_attr_name.attr && hdev->name == NULL)
  98                 return 0;
  99
 100         if (attr == &dev_attr_label.attr && hdev->label == NULL)
 101                 return 0;
 102
 103         return attr->mode;
 104 }
 105
 106 static const struct attribute_group hwmon_dev_attr_group = {
 107         .attrs          = hwmon_dev_attrs,
 108         .is_visible     = hwmon_dev_attr_is_visible,
 109 };
 110
 111 static const struct attribute_group *hwmon_dev_attr_groups[] = {
 112         &hwmon_dev_attr_group,
 113         NULL
 114 };
 115
 116 static void hwmon_free_attrs(struct attribute **attrs)
 117 {
 118         int i;
 119
 120         for (i = 0; attrs[i]; i++) {
 121                 struct device_attribute *dattr = to_dev_attr(attrs[i]);
 122                 struct hwmon_device_attribute *hattr = to_hwmon_attr(dattr);
 123
 124                 kfree(hattr);
 125         }
 126         kfree(attrs);
 127 }
 128
 129 static void hwmon_dev_release(struct device *dev)
 130 {
 131         struct hwmon_device *hwdev = to_hwmon_device(dev);
 132
 133         if (hwdev->group.attrs)
 134                 hwmon_free_attrs(hwdev->group.attrs);
 135         kfree(hwdev->groups);
 136         kfree(hwdev->label);
 137         kfree(hwdev);
 138 }
 139
 140 static const struct class hwmon_class = {
 141         .name = "hwmon",
 142         .dev_groups = hwmon_dev_attr_groups,
 143         .dev_release = hwmon_dev_release,
 144 };
 145
 146 static DEFINE_IDA(hwmon_ida);
 147
 148 static umode_t hwmon_is_visible(const struct hwmon_ops *ops,
 149                                 const void *drvdata,
 150                                 enum hwmon_sensor_types type,
 151                                 u32 attr, int channel)
 152 {
 153         if (ops->visible)
 154                 return ops->visible;
 155
 156         return ops->is_visible(drvdata, type, attr, channel);
 157 }
 158
 159 /* Thermal zone handling */
 160
 161 /*
 162  * The complex conditional is necessary to avoid a cyclic dependency
 163  * between hwmon and thermal_sys modules.
 164  */
 165 #ifdef CONFIG_THERMAL_OF
 166 static int hwmon_thermal_get_temp(struct thermal_zone_device *tz, int *temp)
 167 {
 168         struct hwmon_thermal_data *tdata = thermal_zone_device_priv(tz);
 169         struct hwmon_device *hwdev = to_hwmon_device(tdata->dev);
 170         int ret;
 171         long t;
 172
 173         ret = hwdev->chip->ops->read(tdata->dev, hwmon_temp, hwmon_temp_input,
 174                                      tdata->index, &t);
 175         if (ret < 0)
 176                 return ret;
 177
 178         *temp = t;
 179
 180         return 0;
 181 }
 182
 183 static int hwmon_thermal_set_trips(struct thermal_zone_device *tz, int low, int high)
 184 {
 185         struct hwmon_thermal_data *tdata = thermal_zone_device_priv(tz);
 186         struct hwmon_device *hwdev = to_hwmon_device(tdata->dev);
 187         const struct hwmon_chip_info *chip = hwdev->chip;
 188         const struct hwmon_channel_info * const *info = chip->info;
 189         unsigned int i;
 190         int err;
 191
 192         if (!chip->ops->write)
 193                 return 0;
 194
 195         for (i = 0; info[i] && info[i]->type != hwmon_temp; i++)
 196                 continue;
 197
 198         if (!info[i])
 199                 return 0;
 200
 201         if (info[i]->config[tdata->index] & HWMON_T_MIN) {
 202                 err = chip->ops->write(tdata->dev, hwmon_temp,
 203                                        hwmon_temp_min, tdata->index, low);
 204                 if (err && err != -EOPNOTSUPP)
 205                         return err;
 206         }
 207
 208         if (info[i]->config[tdata->index] & HWMON_T_MAX) {
 209                 err = chip->ops->write(tdata->dev, hwmon_temp,
 210                                        hwmon_temp_max, tdata->index, high);
 211                 if (err && err != -EOPNOTSUPP)
 212                         return err;
 213         }
 214
 215         return 0;
 216 }
 217
 218 static const struct thermal_zone_device_ops hwmon_thermal_ops = {
 219         .get_temp = hwmon_thermal_get_temp,
 220         .set_trips = hwmon_thermal_set_trips,
 221 };
 222
 223 static void hwmon_thermal_remove_sensor(void *data)
 224 {
 225         list_del(data);
 226 }
 227
 228 static int hwmon_thermal_add_sensor(struct device *dev, int index)
 229 {
 230         struct hwmon_device *hwdev = to_hwmon_device(dev);
 231         struct hwmon_thermal_data *tdata;
 232         struct thermal_zone_device *tzd;
 233         int err;
 234
 235         tdata = devm_kzalloc(dev, sizeof(*tdata), GFP_KERNEL);
 236         if (!tdata)
 237                 return -ENOMEM;
 238
 239         tdata->dev = dev;
 240         tdata->index = index;
 241
 242         tzd = devm_thermal_of_zone_register(dev, index, tdata,
 243                                             &hwmon_thermal_ops);
 244         if (IS_ERR(tzd)) {
 245                 if (PTR_ERR(tzd) != -ENODEV)
 246                         return PTR_ERR(tzd);
 247                 dev_info(dev, "temp%d_input not attached to any thermal zone\n",
 248                          index + 1);
 249                 devm_kfree(dev, tdata);
 250                 return 0;
 251         }
 252
 253         err = devm_add_action(dev, hwmon_thermal_remove_sensor, &tdata->node);
 254         if (err)
 255                 return err;
 256
 257         tdata->tzd = tzd;
 258         list_add(&tdata->node, &hwdev->tzdata);
 259
 260         return 0;
 261 }
 262
 263 static int hwmon_thermal_register_sensors(struct device *dev)
 264 {
 265         struct hwmon_device *hwdev = to_hwmon_device(dev);
 266         const struct hwmon_chip_info *chip = hwdev->chip;
 267         const struct hwmon_channel_info * const *info = chip->info;
 268         void *drvdata = dev_get_drvdata(dev);
 269         int i;
 270
 271         for (i = 1; info[i]; i++) {
 272                 int j;
 273
 274                 if (info[i]->type != hwmon_temp)
 275                         continue;
 276
 277                 for (j = 0; info[i]->config[j]; j++) {
 278                         int err;
 279
 280                         if (!(info[i]->config[j] & HWMON_T_INPUT) ||
 281                             !hwmon_is_visible(chip->ops, drvdata, hwmon_temp,
 282                                               hwmon_temp_input, j))
 283                                 continue;
 284
 285                         err = hwmon_thermal_add_sensor(dev, j);
 286                         if (err)
 287                                 return err;
 288                 }
 289         }
 290
 291         return 0;
 292 }
 293
 294 static void hwmon_thermal_notify(struct device *dev, int index)
 295 {
 296         struct hwmon_device *hwdev = to_hwmon_device(dev);
 297         struct hwmon_thermal_data *tzdata;
 298
 299         list_for_each_entry(tzdata, &hwdev->tzdata, node) {
 300                 if (tzdata->index == index) {
 301                         thermal_zone_device_update(tzdata->tzd,
 302                                                    THERMAL_EVENT_UNSPECIFIED);
 303                 }
 304         }
 305 }
 306
 307 #else
 308 static int hwmon_thermal_register_sensors(struct device *dev)
 309 {
 310         return 0;
 311 }
 312
 313 static void hwmon_thermal_notify(struct device *dev, int index) { }
 314
 315 #endif /* IS_REACHABLE(CONFIG_THERMAL) && ... */
 316
 317 static int hwmon_attr_base(enum hwmon_sensor_types type)
 318 {
 319         if (type == hwmon_in || type == hwmon_intrusion)
 320                 return 0;
 321         return 1;
 322 }
 323
 324 #if IS_REACHABLE(CONFIG_I2C)
 325
 326 /*
 327  * PEC support
 328  *
 329  * The 'pec' attribute is attached to I2C client devices. It is only provided
 330  * if the i2c controller supports PEC.
 331  *
 332  * The mutex ensures that PEC configuration between i2c device and the hardware
 333  * is consistent. Use a single mutex because attribute writes are supposed to be
 334  * rare, and maintaining a separate mutex for each hardware monitoring device
 335  * would add substantial complexity to the driver for little if any gain.
 336  *
 337  * The hardware monitoring device is identified as child of the i2c client
 338  * device. This assumes that only a single hardware monitoring device is
 339  * attached to an i2c client device.
 340  */
 341
 342 static DEFINE_MUTEX(hwmon_pec_mutex);
 343
 344 static int hwmon_match_device(struct device *dev, void *data)
 345 {
 346         return dev->class == &hwmon_class;
 347 }
 348
 349 static ssize_t pec_show(struct device *dev, struct device_attribute *dummy,
 350                         char *buf)
 351 {
 352         struct i2c_client *client = to_i2c_client(dev);
 353
 354         return sysfs_emit(buf, "%d\n", !!(client->flags & I2C_CLIENT_PEC));
 355 }
 356
 357 static ssize_t pec_store(struct device *dev, struct device_attribute *devattr,
 358                          const char *buf, size_t count)
 359 {
 360         struct i2c_client *client = to_i2c_client(dev);
 361         struct hwmon_device *hwdev;
 362         struct device *hdev;
 363         bool val;
 364         int err;
 365
 366         err = kstrtobool(buf, &val);
 367         if (err < 0)
 368                 return err;
 369
 370         hdev = device_find_child(dev, NULL, hwmon_match_device);
 371         if (!hdev)
 372                 return -ENODEV;
 373
 374         mutex_lock(&hwmon_pec_mutex);
 375
 376         /*
 377          * If there is no write function, we assume that chip specific
 378          * handling is not required.
 379          */
 380         hwdev = to_hwmon_device(hdev);
 381         if (hwdev->chip->ops->write) {
 382                 err = hwdev->chip->ops->write(hdev, hwmon_chip, hwmon_chip_pec, 0, val);
 383                 if (err && err != -EOPNOTSUPP)
 384                         goto unlock;
 385         }
 386
 387         if (!val)
 388                 client->flags &= ~I2C_CLIENT_PEC;
 389         else
 390                 client->flags |= I2C_CLIENT_PEC;
 391
 392         err = count;
 393 unlock:
 394         mutex_unlock(&hwmon_pec_mutex);
 395         put_device(hdev);
 396
 397         return err;
 398 }
 399
 400 static DEVICE_ATTR_RW(pec);
 401
 402 static void hwmon_remove_pec(void *dev)
 403 {
 404         device_remove_file(dev, &dev_attr_pec);
 405 }
 406
 407 static int hwmon_pec_register(struct device *hdev)
 408 {
 409         struct i2c_client *client = i2c_verify_client(hdev->parent);
 410         int err;
 411
 412         if (!client)
 413                 return -EINVAL;
 414
 415         if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_PEC))
 416                 return 0;
 417
 418         err = device_create_file(&client->dev, &dev_attr_pec);
 419         if (err)
 420                 return err;
 421
 422         return devm_add_action_or_reset(hdev, hwmon_remove_pec, &client->dev);
 423 }
 424
 425 #else /* CONFIG_I2C */
 426 static int hwmon_pec_register(struct device *hdev)
 427 {
 428         return -EINVAL;
 429 }
 430 #endif /* CONFIG_I2C */
 431
 432 /* sysfs attribute management */
 433
 434 static ssize_t hwmon_attr_show(struct device *dev,
 435                                struct device_attribute *devattr, char *buf)
 436 {
 437         struct hwmon_device_attribute *hattr = to_hwmon_attr(devattr);
 438         long val;
 439         int ret;
 440
 441         ret = hattr->ops->read(dev, hattr->type, hattr->attr, hattr->index,
 442                                &val);
 443         if (ret < 0)
 444                 return ret;
 445
 446         trace_hwmon_attr_show(hattr->index + hwmon_attr_base(hattr->type),
 447                               hattr->name, val);
 448
 449         return sprintf(buf, "%ld\n", val);
 450 }
 451
 452 static ssize_t hwmon_attr_show_string(struct device *dev,
 453                                       struct device_attribute *devattr,
 454                                       char *buf)
 455 {
 456         struct hwmon_device_attribute *hattr = to_hwmon_attr(devattr);
 457         enum hwmon_sensor_types type = hattr->type;
 458         const char *s;
 459         int ret;
 460
 461         ret = hattr->ops->read_string(dev, hattr->type, hattr->attr,
 462                                       hattr->index, &s);
 463         if (ret < 0)
 464                 return ret;
 465
 466         trace_hwmon_attr_show_string(hattr->index + hwmon_attr_base(type),
 467                                      hattr->name, s);
 468
 469         return sprintf(buf, "%s\n", s);
 470 }
 471
 472 static ssize_t hwmon_attr_store(struct device *dev,
 473                                 struct device_attribute *devattr,
 474                                 const char *buf, size_t count)
 475 {
 476         struct hwmon_device_attribute *hattr = to_hwmon_attr(devattr);
 477         long val;
 478         int ret;
 479
 480         ret = kstrtol(buf, 10, &val);
 481         if (ret < 0)
 482                 return ret;
 483
 484         ret = hattr->ops->write(dev, hattr->type, hattr->attr, hattr->index,
 485                                 val);
 486         if (ret < 0)
 487                 return ret;
 488
 489         trace_hwmon_attr_store(hattr->index + hwmon_attr_base(hattr->type),
 490                                hattr->name, val);
 491
 492         return count;
 493 }
 494
 495 static bool is_string_attr(enum hwmon_sensor_types type, u32 attr)
 496 {
 497         return (type == hwmon_temp && attr == hwmon_temp_label) ||
 498                (type == hwmon_in && attr == hwmon_in_label) ||
 499                (type == hwmon_curr && attr == hwmon_curr_label) ||
 500                (type == hwmon_power && attr == hwmon_power_label) ||
 501                (type == hwmon_energy && attr == hwmon_energy_label) ||
 502                (type == hwmon_humidity && attr == hwmon_humidity_label) ||
 503                (type == hwmon_fan && attr == hwmon_fan_label);
 504 }
 505
 506 static struct attribute *hwmon_genattr(const void *drvdata,
 507                                        enum hwmon_sensor_types type,
 508                                        u32 attr,
 509                                        int index,
 510                                        const char *template,
 511                                        const struct hwmon_ops *ops)
 512 {
 513         struct hwmon_device_attribute *hattr;
 514         struct device_attribute *dattr;
 515         struct attribute *a;
 516         umode_t mode;
 517         const char *name;
 518         bool is_string = is_string_attr(type, attr);
 519
 520         mode = hwmon_is_visible(ops, drvdata, type, attr, index);
 521         if (!mode)
 522                 return ERR_PTR(-ENOENT);
 523
 524         if ((mode & 0444) && ((is_string && !ops->read_string) ||
 525                                  (!is_string && !ops->read)))
 526                 return ERR_PTR(-EINVAL);
 527         if ((mode & 0222) && !ops->write)
 528                 return ERR_PTR(-EINVAL);
 529
 530         hattr = kzalloc(sizeof(*hattr), GFP_KERNEL);
 531         if (!hattr)
 532                 return ERR_PTR(-ENOMEM);
 533
 534         if (type == hwmon_chip) {
 535                 name = template;
 536         } else {
 537                 scnprintf(hattr->name, sizeof(hattr->name), template,
 538                           index + hwmon_attr_base(type));
 539                 name = hattr->name;
 540         }
 541
 542         hattr->type = type;
 543         hattr->attr = attr;
 544         hattr->index = index;
 545         hattr->ops = ops;
 546
 547         dattr = &hattr->dev_attr;
 548         dattr->show = is_string ? hwmon_attr_show_string : hwmon_attr_show;
 549         dattr->store = hwmon_attr_store;
 550
 551         a = &dattr->attr;
 552         sysfs_attr_init(a);
 553         a->name = name;
 554         a->mode = mode;
 555
 556         return a;
 557 }
 558
 559 /*
 560  * Chip attributes are not attribute templates but actual sysfs attributes.
 561  * See hwmon_genattr() for special handling.
 562  */
 563 static const char * const hwmon_chip_attrs[] = {
 564         [hwmon_chip_temp_reset_history] = "temp_reset_history",
 565         [hwmon_chip_in_reset_history] = "in_reset_history",
 566         [hwmon_chip_curr_reset_history] = "curr_reset_history",
 567         [hwmon_chip_power_reset_history] = "power_reset_history",
 568         [hwmon_chip_update_interval] = "update_interval",
 569         [hwmon_chip_alarms] = "alarms",
 570         [hwmon_chip_samples] = "samples",
 571         [hwmon_chip_curr_samples] = "curr_samples",
 572         [hwmon_chip_in_samples] = "in_samples",
 573         [hwmon_chip_power_samples] = "power_samples",
 574         [hwmon_chip_temp_samples] = "temp_samples",
 575         [hwmon_chip_beep_enable] = "beep_enable",
 576 };
 577
 578 static const char * const hwmon_temp_attr_templates[] = {
 579         [hwmon_temp_enable] = "temp%d_enable",
 580         [hwmon_temp_input] = "temp%d_input",
 581         [hwmon_temp_type] = "temp%d_type",
 582         [hwmon_temp_lcrit] = "temp%d_lcrit",
 583         [hwmon_temp_lcrit_hyst] = "temp%d_lcrit_hyst",
 584         [hwmon_temp_min] = "temp%d_min",
 585         [hwmon_temp_min_hyst] = "temp%d_min_hyst",
 586         [hwmon_temp_max] = "temp%d_max",
 587         [hwmon_temp_max_hyst] = "temp%d_max_hyst",
 588         [hwmon_temp_crit] = "temp%d_crit",
 589         [hwmon_temp_crit_hyst] = "temp%d_crit_hyst",
 590         [hwmon_temp_emergency] = "temp%d_emergency",
 591         [hwmon_temp_emergency_hyst] = "temp%d_emergency_hyst",
 592         [hwmon_temp_alarm] = "temp%d_alarm",
 593         [hwmon_temp_lcrit_alarm] = "temp%d_lcrit_alarm",
 594         [hwmon_temp_min_alarm] = "temp%d_min_alarm",
 595         [hwmon_temp_max_alarm] = "temp%d_max_alarm",
 596         [hwmon_temp_crit_alarm] = "temp%d_crit_alarm",
 597         [hwmon_temp_emergency_alarm] = "temp%d_emergency_alarm",
 598         [hwmon_temp_fault] = "temp%d_fault",
 599         [hwmon_temp_offset] = "temp%d_offset",
 600         [hwmon_temp_label] = "temp%d_label",
 601         [hwmon_temp_lowest] = "temp%d_lowest",
 602         [hwmon_temp_highest] = "temp%d_highest",
 603         [hwmon_temp_reset_history] = "temp%d_reset_history",
 604         [hwmon_temp_rated_min] = "temp%d_rated_min",
 605         [hwmon_temp_rated_max] = "temp%d_rated_max",
 606         [hwmon_temp_beep] = "temp%d_beep",
 607 };
 608
 609 static const char * const hwmon_in_attr_templates[] = {
 610         [hwmon_in_enable] = "in%d_enable",
 611         [hwmon_in_input] = "in%d_input",
 612         [hwmon_in_min] = "in%d_min",
 613         [hwmon_in_max] = "in%d_max",
 614         [hwmon_in_lcrit] = "in%d_lcrit",
 615         [hwmon_in_crit] = "in%d_crit",
 616         [hwmon_in_average] = "in%d_average",
 617         [hwmon_in_lowest] = "in%d_lowest",
 618         [hwmon_in_highest] = "in%d_highest",
 619         [hwmon_in_reset_history] = "in%d_reset_history",
 620         [hwmon_in_label] = "in%d_label",
 621         [hwmon_in_alarm] = "in%d_alarm",
 622         [hwmon_in_min_alarm] = "in%d_min_alarm",
 623         [hwmon_in_max_alarm] = "in%d_max_alarm",
 624         [hwmon_in_lcrit_alarm] = "in%d_lcrit_alarm",
 625         [hwmon_in_crit_alarm] = "in%d_crit_alarm",
 626         [hwmon_in_rated_min] = "in%d_rated_min",
 627         [hwmon_in_rated_max] = "in%d_rated_max",
 628         [hwmon_in_beep] = "in%d_beep",
 629         [hwmon_in_fault] = "in%d_fault",
 630 };
 631
 632 static const char * const hwmon_curr_attr_templates[] = {
 633         [hwmon_curr_enable] = "curr%d_enable",
 634         [hwmon_curr_input] = "curr%d_input",
 635         [hwmon_curr_min] = "curr%d_min",
 636         [hwmon_curr_max] = "curr%d_max",
 637         [hwmon_curr_lcrit] = "curr%d_lcrit",
 638         [hwmon_curr_crit] = "curr%d_crit",
 639         [hwmon_curr_average] = "curr%d_average",
 640         [hwmon_curr_lowest] = "curr%d_lowest",
 641         [hwmon_curr_highest] = "curr%d_highest",
 642         [hwmon_curr_reset_history] = "curr%d_reset_history",
 643         [hwmon_curr_label] = "curr%d_label",
 644         [hwmon_curr_alarm] = "curr%d_alarm",
 645         [hwmon_curr_min_alarm] = "curr%d_min_alarm",
 646         [hwmon_curr_max_alarm] = "curr%d_max_alarm",
 647         [hwmon_curr_lcrit_alarm] = "curr%d_lcrit_alarm",
 648         [hwmon_curr_crit_alarm] = "curr%d_crit_alarm",
 649         [hwmon_curr_rated_min] = "curr%d_rated_min",
 650         [hwmon_curr_rated_max] = "curr%d_rated_max",
 651         [hwmon_curr_beep] = "curr%d_beep",
 652 };
 653
 654 static const char * const hwmon_power_attr_templates[] = {
 655         [hwmon_power_enable] = "power%d_enable",
 656         [hwmon_power_average] = "power%d_average",
 657         [hwmon_power_average_interval] = "power%d_average_interval",
 658         [hwmon_power_average_interval_max] = "power%d_interval_max",
 659         [hwmon_power_average_interval_min] = "power%d_interval_min",
 660         [hwmon_power_average_highest] = "power%d_average_highest",
 661         [hwmon_power_average_lowest] = "power%d_average_lowest",
 662         [hwmon_power_average_max] = "power%d_average_max",
 663         [hwmon_power_average_min] = "power%d_average_min",
 664         [hwmon_power_input] = "power%d_input",
 665         [hwmon_power_input_highest] = "power%d_input_highest",
 666         [hwmon_power_input_lowest] = "power%d_input_lowest",
 667         [hwmon_power_reset_history] = "power%d_reset_history",
 668         [hwmon_power_accuracy] = "power%d_accuracy",
 669         [hwmon_power_cap] = "power%d_cap",
 670         [hwmon_power_cap_hyst] = "power%d_cap_hyst",
 671         [hwmon_power_cap_max] = "power%d_cap_max",
 672         [hwmon_power_cap_min] = "power%d_cap_min",
 673         [hwmon_power_min] = "power%d_min",
 674         [hwmon_power_max] = "power%d_max",
 675         [hwmon_power_lcrit] = "power%d_lcrit",
 676         [hwmon_power_crit] = "power%d_crit",
 677         [hwmon_power_label] = "power%d_label",
 678         [hwmon_power_alarm] = "power%d_alarm",
 679         [hwmon_power_cap_alarm] = "power%d_cap_alarm",
 680         [hwmon_power_min_alarm] = "power%d_min_alarm",
 681         [hwmon_power_max_alarm] = "power%d_max_alarm",
 682         [hwmon_power_lcrit_alarm] = "power%d_lcrit_alarm",
 683         [hwmon_power_crit_alarm] = "power%d_crit_alarm",
 684         [hwmon_power_rated_min] = "power%d_rated_min",
 685         [hwmon_power_rated_max] = "power%d_rated_max",
 686 };
 687
 688 static const char * const hwmon_energy_attr_templates[] = {
 689         [hwmon_energy_enable] = "energy%d_enable",
 690         [hwmon_energy_input] = "energy%d_input",
 691         [hwmon_energy_label] = "energy%d_label",
 692 };
 693
 694 static const char * const hwmon_humidity_attr_templates[] = {
 695         [hwmon_humidity_enable] = "humidity%d_enable",
 696         [hwmon_humidity_input] = "humidity%d_input",
 697         [hwmon_humidity_label] = "humidity%d_label",
 698         [hwmon_humidity_min] = "humidity%d_min",
 699         [hwmon_humidity_min_hyst] = "humidity%d_min_hyst",
 700         [hwmon_humidity_max] = "humidity%d_max",
 701         [hwmon_humidity_max_hyst] = "humidity%d_max_hyst",
 702         [hwmon_humidity_alarm] = "humidity%d_alarm",
 703         [hwmon_humidity_fault] = "humidity%d_fault",
 704         [hwmon_humidity_rated_min] = "humidity%d_rated_min",
 705         [hwmon_humidity_rated_max] = "humidity%d_rated_max",
 706         [hwmon_humidity_min_alarm] = "humidity%d_min_alarm",
 707         [hwmon_humidity_max_alarm] = "humidity%d_max_alarm",
 708 };
 709
 710 static const char * const hwmon_fan_attr_templates[] = {
 711         [hwmon_fan_enable] = "fan%d_enable",
 712         [hwmon_fan_input] = "fan%d_input",
 713         [hwmon_fan_label] = "fan%d_label",
 714         [hwmon_fan_min] = "fan%d_min",
 715         [hwmon_fan_max] = "fan%d_max",
 716         [hwmon_fan_div] = "fan%d_div",
 717         [hwmon_fan_pulses] = "fan%d_pulses",
 718         [hwmon_fan_target] = "fan%d_target",
 719         [hwmon_fan_alarm] = "fan%d_alarm",
 720         [hwmon_fan_min_alarm] = "fan%d_min_alarm",
 721         [hwmon_fan_max_alarm] = "fan%d_max_alarm",
 722         [hwmon_fan_fault] = "fan%d_fault",
 723         [hwmon_fan_beep] = "fan%d_beep",
 724 };
 725
 726 static const char * const hwmon_pwm_attr_templates[] = {
 727         [hwmon_pwm_input] = "pwm%d",
 728         [hwmon_pwm_enable] = "pwm%d_enable",
 729         [hwmon_pwm_mode] = "pwm%d_mode",
 730         [hwmon_pwm_freq] = "pwm%d_freq",
 731         [hwmon_pwm_auto_channels_temp] = "pwm%d_auto_channels_temp",
 732 };
 733
 734 static const char * const hwmon_intrusion_attr_templates[] = {
 735         [hwmon_intrusion_alarm] = "intrusion%d_alarm",
 736         [hwmon_intrusion_beep]  = "intrusion%d_beep",
 737 };
 738
 739 static const char * const *__templates[] = {
 740         [hwmon_chip] = hwmon_chip_attrs,
 741         [hwmon_temp] = hwmon_temp_attr_templates,
 742         [hwmon_in] = hwmon_in_attr_templates,
 743         [hwmon_curr] = hwmon_curr_attr_templates,
 744         [hwmon_power] = hwmon_power_attr_templates,
 745         [hwmon_energy] = hwmon_energy_attr_templates,
 746         [hwmon_humidity] = hwmon_humidity_attr_templates,
 747         [hwmon_fan] = hwmon_fan_attr_templates,
 748         [hwmon_pwm] = hwmon_pwm_attr_templates,
 749         [hwmon_intrusion] = hwmon_intrusion_attr_templates,
 750 };
 751
 752 static const int __templates_size[] = {
 753         [hwmon_chip] = ARRAY_SIZE(hwmon_chip_attrs),
 754         [hwmon_temp] = ARRAY_SIZE(hwmon_temp_attr_templates),
 755         [hwmon_in] = ARRAY_SIZE(hwmon_in_attr_templates),
 756         [hwmon_curr] = ARRAY_SIZE(hwmon_curr_attr_templates),
 757         [hwmon_power] = ARRAY_SIZE(hwmon_power_attr_templates),
 758         [hwmon_energy] = ARRAY_SIZE(hwmon_energy_attr_templates),
 759         [hwmon_humidity] = ARRAY_SIZE(hwmon_humidity_attr_templates),
 760         [hwmon_fan] = ARRAY_SIZE(hwmon_fan_attr_templates),
 761         [hwmon_pwm] = ARRAY_SIZE(hwmon_pwm_attr_templates),
 762         [hwmon_intrusion] = ARRAY_SIZE(hwmon_intrusion_attr_templates),
 763 };
 764
 765 int hwmon_notify_event(struct device *dev, enum hwmon_sensor_types type,
 766                        u32 attr, int channel)
 767 {
 768         char event[MAX_SYSFS_ATTR_NAME_LENGTH + 5];
 769         char sattr[MAX_SYSFS_ATTR_NAME_LENGTH];
 770         char *envp[] = { event, NULL };
 771         const char * const *templates;
 772         const char *template;
 773         int base;
 774
 775         if (type >= ARRAY_SIZE(__templates))
 776                 return -EINVAL;
 777         if (attr >= __templates_size[type])
 778                 return -EINVAL;
 779
 780         templates = __templates[type];
 781         template = templates[attr];
 782
 783         base = hwmon_attr_base(type);
 784
 785         scnprintf(sattr, MAX_SYSFS_ATTR_NAME_LENGTH, template, base + channel);
 786         scnprintf(event, sizeof(event), "NAME=%s", sattr);
 787         sysfs_notify(&dev->kobj, NULL, sattr);
 788         kobject_uevent_env(&dev->kobj, KOBJ_CHANGE, envp);
 789
 790         if (type == hwmon_temp)
 791                 hwmon_thermal_notify(dev, channel);
 792
 793         return 0;
 794 }
 795 EXPORT_SYMBOL_GPL(hwmon_notify_event);
 796
 797 static int hwmon_num_channel_attrs(const struct hwmon_channel_info *info)
 798 {
 799         int i, n;
 800
 801         for (i = n = 0; info->config[i]; i++)
 802                 n += hweight32(info->config[i]);
 803
 804         return n;
 805 }
 806
 807 static int hwmon_genattrs(const void *drvdata,
 808                           struct attribute **attrs,
 809                           const struct hwmon_ops *ops,
 810                           const struct hwmon_channel_info *info)
 811 {
 812         const char * const *templates;
 813         int template_size;
 814         int i, aindex = 0;
 815
 816         if (info->type >= ARRAY_SIZE(__templates))
 817                 return -EINVAL;
 818
 819         templates = __templates[info->type];
 820         template_size = __templates_size[info->type];
 821
 822         for (i = 0; info->config[i]; i++) {
 823                 u32 attr_mask = info->config[i];
 824                 u32 attr;
 825
 826                 while (attr_mask) {
 827                         struct attribute *a;
 828
 829                         attr = __ffs(attr_mask);
 830                         attr_mask &= ~BIT(attr);
 831                         if (attr >= template_size || !templates[attr])
 832                                 continue;       /* attribute is invisible */
 833                         a = hwmon_genattr(drvdata, info->type, attr, i,
 834                                           templates[attr], ops);
 835                         if (IS_ERR(a)) {
 836                                 if (PTR_ERR(a) != -ENOENT)
 837                                         return PTR_ERR(a);
 838                                 continue;
 839                         }
 840                         attrs[aindex++] = a;
 841                 }
 842         }
 843         return aindex;
 844 }
 845
 846 static struct attribute **
 847 __hwmon_create_attrs(const void *drvdata, const struct hwmon_chip_info *chip)
 848 {
 849         int ret, i, aindex = 0, nattrs = 0;
 850         struct attribute **attrs;
 851
 852         for (i = 0; chip->info[i]; i++)
 853                 nattrs += hwmon_num_channel_attrs(chip->info[i]);
 854
 855         if (nattrs == 0)
 856                 return ERR_PTR(-EINVAL);
 857
 858         attrs = kcalloc(nattrs + 1, sizeof(*attrs), GFP_KERNEL);
 859         if (!attrs)
 860                 return ERR_PTR(-ENOMEM);
 861
 862         for (i = 0; chip->info[i]; i++) {
 863                 ret = hwmon_genattrs(drvdata, &attrs[aindex], chip->ops,
 864                                      chip->info[i]);
 865                 if (ret < 0) {
 866                         hwmon_free_attrs(attrs);
 867                         return ERR_PTR(ret);
 868                 }
 869                 aindex += ret;
 870         }
 871
 872         return attrs;
 873 }
 874
 875 static struct device *
 876 __hwmon_device_register(struct device *dev, const char *name, void *drvdata,
 877                         const struct hwmon_chip_info *chip,
 878                         const struct attribute_group **groups)
 879 {
 880         struct hwmon_device *hwdev;
 881         const char *label;
 882         struct device *hdev;
 883         struct device *tdev = dev;
 884         int i, err, id;
 885
 886         /* Complain about invalid characters in hwmon name attribute */
 887         if (name && (!strlen(name) || strpbrk(name, "-* \t\n")))
 888                 dev_warn(dev,
 889                          "hwmon: '%s' is not a valid name attribute, please fix\n",
 890                          name);
 891
 892         id = ida_alloc(&hwmon_ida, GFP_KERNEL);
 893         if (id < 0)
 894                 return ERR_PTR(id);
 895
 896         hwdev = kzalloc(sizeof(*hwdev), GFP_KERNEL);
 897         if (hwdev == NULL) {
 898                 err = -ENOMEM;
 899                 goto ida_remove;
 900         }
 901
 902         hdev = &hwdev->dev;
 903
 904         if (chip) {
 905                 struct attribute **attrs;
 906                 int ngroups = 2; /* terminating NULL plus &hwdev->groups */
 907
 908                 if (groups)
 909                         for (i = 0; groups[i]; i++)
 910                                 ngroups++;
 911
 912                 hwdev->groups = kcalloc(ngroups, sizeof(*groups), GFP_KERNEL);
 913                 if (!hwdev->groups) {
 914                         err = -ENOMEM;
 915                         goto free_hwmon;
 916                 }
 917
 918                 attrs = __hwmon_create_attrs(drvdata, chip);
 919                 if (IS_ERR(attrs)) {
 920                         err = PTR_ERR(attrs);
 921                         goto free_hwmon;
 922                 }
 923
 924                 hwdev->group.attrs = attrs;
 925                 ngroups = 0;
 926                 hwdev->groups[ngroups++] = &hwdev->group;
 927
 928                 if (groups) {
 929                         for (i = 0; groups[i]; i++)
 930                                 hwdev->groups[ngroups++] = groups[i];
 931                 }
 932
 933                 hdev->groups = hwdev->groups;
 934         } else {
 935                 hdev->groups = groups;
 936         }
 937
 938         if (dev && device_property_present(dev, "label")) {
 939                 err = device_property_read_string(dev, "label", &label);
 940                 if (err < 0)
 941                         goto free_hwmon;
 942
 943                 hwdev->label = kstrdup(label, GFP_KERNEL);
 944                 if (hwdev->label == NULL) {
 945                         err = -ENOMEM;
 946                         goto free_hwmon;
 947                 }
 948         }
 949
 950         hwdev->name = name;
 951         hdev->class = &hwmon_class;
 952         hdev->parent = dev;
 953         while (tdev && !tdev->of_node)
 954                 tdev = tdev->parent;
 955         hdev->of_node = tdev ? tdev->of_node : NULL;
 956         hwdev->chip = chip;
 957         dev_set_drvdata(hdev, drvdata);
 958         dev_set_name(hdev, HWMON_ID_FORMAT, id);
 959         err = device_register(hdev);
 960         if (err) {
 961                 put_device(hdev);
 962                 goto ida_remove;
 963         }
 964
 965         INIT_LIST_HEAD(&hwdev->tzdata);
 966
 967         if (hdev->of_node && chip && chip->ops->read &&
 968             chip->info[0]->type == hwmon_chip) {
 969                 u32 config = chip->info[0]->config[0];
 970
 971                 if (config & HWMON_C_REGISTER_TZ) {
 972                         err = hwmon_thermal_register_sensors(hdev);
 973                         if (err) {
 974                                 device_unregister(hdev);
 975                                 /*
 976                                  * Don't worry about hwdev; hwmon_dev_release(),
 977                                  * called from device_unregister(), will free it.
 978                                  */
 979                                 goto ida_remove;
 980                         }
 981                 }
 982                 if (config & HWMON_C_PEC) {
 983                         err = hwmon_pec_register(hdev);
 984                         if (err) {
 985                                 device_unregister(hdev);
 986                                 goto ida_remove;
 987                         }
 988                 }
 989         }
 990
 991         return hdev;
 992
 993 free_hwmon:
 994         hwmon_dev_release(hdev);
 995 ida_remove:
 996         ida_free(&hwmon_ida, id);
 997         return ERR_PTR(err);
 998 }
 999
1000 /**
1001  * hwmon_device_register_with_groups - register w/ hwmon
1002  * @dev: the parent device
1003  * @name: hwmon name attribute
1004  * @drvdata: driver data to attach to created device
1005  * @groups: List of attribute groups to create
1006  *
1007  * hwmon_device_unregister() must be called when the device is no
1008  * longer needed.
1009  *
1010  * Returns the pointer to the new device.
1011  */
1012 struct device *
1013 hwmon_device_register_with_groups(struct device *dev, const char *name,
1014                                   void *drvdata,
1015                                   const struct attribute_group **groups)
1016 {
1017         if (!name)
1018                 return ERR_PTR(-EINVAL);
1019
1020         return __hwmon_device_register(dev, name, drvdata, NULL, groups);
1021 }
1022 EXPORT_SYMBOL_GPL(hwmon_device_register_with_groups);
1023
1024 /**
1025  * hwmon_device_register_with_info - register w/ hwmon
1026  * @dev: the parent device (mandatory)
1027  * @name: hwmon name attribute (mandatory)
1028  * @drvdata: driver data to attach to created device (optional)
1029  * @chip: pointer to hwmon chip information (mandatory)
1030  * @extra_groups: pointer to list of additional non-standard attribute groups
1031  *      (optional)
1032  *
1033  * hwmon_device_unregister() must be called when the device is no
1034  * longer needed.
1035  *
1036  * Returns the pointer to the new device.
1037  */
1038 struct device *
1039 hwmon_device_register_with_info(struct device *dev, const char *name,
1040                                 void *drvdata,
1041                                 const struct hwmon_chip_info *chip,
1042                                 const struct attribute_group **extra_groups)
1043 {
1044         if (!dev || !name || !chip)
1045                 return ERR_PTR(-EINVAL);
1046
1047         if (!chip->ops || !(chip->ops->visible || chip->ops->is_visible) || !chip->info)
1048                 return ERR_PTR(-EINVAL);
1049
1050         return __hwmon_device_register(dev, name, drvdata, chip, extra_groups);
1051 }
1052 EXPORT_SYMBOL_GPL(hwmon_device_register_with_info);
1053
1054 /**
1055  * hwmon_device_register_for_thermal - register hwmon device for thermal subsystem
1056  * @dev: the parent device
1057  * @name: hwmon name attribute
1058  * @drvdata: driver data to attach to created device
1059  *
1060  * The use of this function is restricted. It is provided for legacy reasons
1061  * and must only be called from the thermal subsystem.
1062  *
1063  * hwmon_device_unregister() must be called when the device is no
1064  * longer needed.
1065  *
1066  * Returns the pointer to the new device.
1067  */
1068 struct device *
1069 hwmon_device_register_for_thermal(struct device *dev, const char *name,
1070                                   void *drvdata)
1071 {
1072         if (!name || !dev)
1073                 return ERR_PTR(-EINVAL);
1074
1075         return __hwmon_device_register(dev, name, drvdata, NULL, NULL);
1076 }
1077 EXPORT_SYMBOL_NS_GPL(hwmon_device_register_for_thermal, HWMON_THERMAL);
1078
1079 /**
1080  * hwmon_device_register - register w/ hwmon
1081  * @dev: the device to register
1082  *
1083  * hwmon_device_unregister() must be called when the device is no
1084  * longer needed.
1085  *
1086  * Returns the pointer to the new device.
1087  */
1088 struct device *hwmon_device_register(struct device *dev)
1089 {
1090         dev_warn(dev,
1091                  "hwmon_device_register() is deprecated. Please convert the driver to use hwmon_device_register_with_info().\n");
1092
1093         return __hwmon_device_register(dev, NULL, NULL, NULL, NULL);
1094 }
1095 EXPORT_SYMBOL_GPL(hwmon_device_register);
1096
1097 /**
1098  * hwmon_device_unregister - removes the previously registered class device
1099  *
1100  * @dev: the class device to destroy
1101  */
1102 void hwmon_device_unregister(struct device *dev)
1103 {
1104         int id;
1105
1106         if (likely(sscanf(dev_name(dev), HWMON_ID_FORMAT, &id) == 1)) {
1107                 device_unregister(dev);
1108                 ida_free(&hwmon_ida, id);
1109         } else
1110                 dev_dbg(dev->parent,
1111                         "hwmon_device_unregister() failed: bad class ID!\n");
1112 }
1113 EXPORT_SYMBOL_GPL(hwmon_device_unregister);
1114
1115 static void devm_hwmon_release(struct device *dev, void *res)
1116 {
1117         struct device *hwdev = *(struct device **)res;
1118
1119         hwmon_device_unregister(hwdev);
1120 }
1121
1122 /**
1123  * devm_hwmon_device_register_with_groups - register w/ hwmon
1124  * @dev: the parent device
1125  * @name: hwmon name attribute
1126  * @drvdata: driver data to attach to created device
1127  * @groups: List of attribute groups to create
1128  *
1129  * Returns the pointer to the new device. The new device is automatically
1130  * unregistered with the parent device.
1131  */
1132 struct device *
1133 devm_hwmon_device_register_with_groups(struct device *dev, const char *name,
1134                                        void *drvdata,
1135                                        const struct attribute_group **groups)
1136 {
1137         struct device **ptr, *hwdev;
1138
1139         if (!dev)
1140                 return ERR_PTR(-EINVAL);
1141
1142         ptr = devres_alloc(devm_hwmon_release, sizeof(*ptr), GFP_KERNEL);
1143         if (!ptr)
1144                 return ERR_PTR(-ENOMEM);
1145
1146         hwdev = hwmon_device_register_with_groups(dev, name, drvdata, groups);
1147         if (IS_ERR(hwdev))
1148                 goto error;
1149
1150         *ptr = hwdev;
1151         devres_add(dev, ptr);
1152         return hwdev;
1153
1154 error:
1155         devres_free(ptr);
1156         return hwdev;
1157 }
1158 EXPORT_SYMBOL_GPL(devm_hwmon_device_register_with_groups);
1159
1160 /**
1161  * devm_hwmon_device_register_with_info - register w/ hwmon
1162  * @dev:        the parent device
1163  * @name:       hwmon name attribute
1164  * @drvdata:    driver data to attach to created device
1165  * @chip:       pointer to hwmon chip information
1166  * @extra_groups: pointer to list of driver specific attribute groups
1167  *
1168  * Returns the pointer to the new device. The new device is automatically
1169  * unregistered with the parent device.
1170  */
1171 struct device *
1172 devm_hwmon_device_register_with_info(struct device *dev, const char *name,
1173                                      void *drvdata,
1174                                      const struct hwmon_chip_info *chip,
1175                                      const struct attribute_group **extra_groups)
1176 {
1177         struct device **ptr, *hwdev;
1178
1179         if (!dev)
1180                 return ERR_PTR(-EINVAL);
1181
1182         ptr = devres_alloc(devm_hwmon_release, sizeof(*ptr), GFP_KERNEL);
1183         if (!ptr)
1184                 return ERR_PTR(-ENOMEM);
1185
1186         hwdev = hwmon_device_register_with_info(dev, name, drvdata, chip,
1187                                                 extra_groups);
1188         if (IS_ERR(hwdev))
1189                 goto error;
1190
1191         *ptr = hwdev;
1192         devres_add(dev, ptr);
1193
1194         return hwdev;
1195
1196 error:
1197         devres_free(ptr);
1198         return hwdev;
1199 }
1200 EXPORT_SYMBOL_GPL(devm_hwmon_device_register_with_info);
1201
1202 static char *__hwmon_sanitize_name(struct device *dev, const char *old_name)
1203 {
1204         char *name, *p;
1205
1206         if (dev)
1207                 name = devm_kstrdup(dev, old_name, GFP_KERNEL);
1208         else
1209                 name = kstrdup(old_name, GFP_KERNEL);
1210         if (!name)
1211                 return ERR_PTR(-ENOMEM);
1212
1213         for (p = name; *p; p++)
1214                 if (hwmon_is_bad_char(*p))
1215                         *p = '_';
1216
1217         return name;
1218 }
1219
1220 /**
1221  * hwmon_sanitize_name - Replaces invalid characters in a hwmon name
1222  * @name: NUL-terminated name
1223  *
1224  * Allocates a new string where any invalid characters will be replaced
1225  * by an underscore. It is the responsibility of the caller to release
1226  * the memory.
1227  *
1228  * Returns newly allocated name, or ERR_PTR on error.
1229  */
1230 char *hwmon_sanitize_name(const char *name)
1231 {
1232         return __hwmon_sanitize_name(NULL, name);
1233 }
1234 EXPORT_SYMBOL_GPL(hwmon_sanitize_name);
1235
1236 /**
1237  * devm_hwmon_sanitize_name - resource managed hwmon_sanitize_name()
1238  * @dev: device to allocate memory for
1239  * @name: NUL-terminated name
1240  *
1241  * Allocates a new string where any invalid characters will be replaced
1242  * by an underscore.
1243  *
1244  * Returns newly allocated name, or ERR_PTR on error.
1245  */
1246 char *devm_hwmon_sanitize_name(struct device *dev, const char *name)
1247 {
1248         if (!dev)
1249                 return ERR_PTR(-EINVAL);
1250
1251         return __hwmon_sanitize_name(dev, name);
1252 }
1253 EXPORT_SYMBOL_GPL(devm_hwmon_sanitize_name);
1254
1255 static void __init hwmon_pci_quirks(void)
1256 {
1257 #if defined CONFIG_X86 && defined CONFIG_PCI
1258         struct pci_dev *sb;
1259         u16 base;
1260         u8 enable;
1261
1262         /* Open access to 0x295-0x296 on MSI MS-7031 */
1263         sb = pci_get_device(PCI_VENDOR_ID_ATI, 0x436c, NULL);
1264         if (sb) {
1265                 if (sb->subsystem_vendor == 0x1462 &&   /* MSI */
1266                     sb->subsystem_device == 0x0031) {   /* MS-7031 */
1267                         pci_read_config_byte(sb, 0x48, &enable);
1268                         pci_read_config_word(sb, 0x64, &base);
1269
1270                         if (base == 0 && !(enable & BIT(2))) {
1271                                 dev_info(&sb->dev,
1272                                          "Opening wide generic port at 0x295\n");
1273                                 pci_write_config_word(sb, 0x64, 0x295);
1274                                 pci_write_config_byte(sb, 0x48,
1275                                                       enable | BIT(2));
1276                         }
1277                 }
1278                 pci_dev_put(sb);
1279         }
1280 #endif
1281 }
1282
1283 static int __init hwmon_init(void)
1284 {
1285         int err;
1286
1287         hwmon_pci_quirks();
1288
1289         err = class_register(&hwmon_class);
1290         if (err) {
1291                 pr_err("couldn't register hwmon sysfs class\n");
1292                 return err;
1293         }
1294         return 0;
1295 }
1296
1297 static void __exit hwmon_exit(void)
1298 {
1299         class_unregister(&hwmon_class);
1300 }
1301
1302 subsys_initcall(hwmon_init);
1303 module_exit(hwmon_exit);
1304
1305 MODULE_AUTHOR("Mark M. Hoffman <mhoffman@lightlink.com>");
1306 MODULE_DESCRIPTION("hardware monitoring sysfs/class support");
1307 MODULE_LICENSE("GPL");
1308