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/idr.h>
  18 #include <linux/module.h>
  19 #include <linux/pci.h>
  20 #include <linux/slab.h>
  21 #include <linux/string.h>
  22 #include <linux/thermal.h>
  23
  24 #define CREATE_TRACE_POINTS
  25 #include <trace/events/hwmon.h>
  26
  27 #define HWMON_ID_PREFIX "hwmon"
  28 #define HWMON_ID_FORMAT HWMON_ID_PREFIX "%d"
  29
  30 struct hwmon_device {
  31         const char *name;
  32         struct device dev;
  33         const struct hwmon_chip_info *chip;
  34
  35         struct attribute_group group;
  36         const struct attribute_group **groups;
  37 };
  38
  39 #define to_hwmon_device(d) container_of(d, struct hwmon_device, dev)
  40
  41 #define MAX_SYSFS_ATTR_NAME_LENGTH      32
  42
  43 struct hwmon_device_attribute {
  44         struct device_attribute dev_attr;
  45         const struct hwmon_ops *ops;
  46         enum hwmon_sensor_types type;
  47         u32 attr;
  48         int index;
  49         char name[MAX_SYSFS_ATTR_NAME_LENGTH];
  50 };
  51
  52 #define to_hwmon_attr(d) \
  53         container_of(d, struct hwmon_device_attribute, dev_attr)
  54
  55 /*
  56  * Thermal zone information
  57  * In addition to the reference to the hwmon device,
  58  * also provides the sensor index.
  59  */
  60 struct hwmon_thermal_data {
  61         struct hwmon_device *hwdev;     /* Reference to hwmon device */
  62         int index;                      /* sensor index */
  63 };
  64
  65 static ssize_t
  66 name_show(struct device *dev, struct device_attribute *attr, char *buf)
  67 {
  68         return sprintf(buf, "%s\n", to_hwmon_device(dev)->name);
  69 }
  70 static DEVICE_ATTR_RO(name);
  71
  72 static struct attribute *hwmon_dev_attrs[] = {
  73         &dev_attr_name.attr,
  74         NULL
  75 };
  76
  77 static umode_t hwmon_dev_name_is_visible(struct kobject *kobj,
  78                                          struct attribute *attr, int n)
  79 {
  80         struct device *dev = container_of(kobj, struct device, kobj);
  81
  82         if (to_hwmon_device(dev)->name == NULL)
  83                 return 0;
  84
  85         return attr->mode;
  86 }
  87
  88 static const struct attribute_group hwmon_dev_attr_group = {
  89         .attrs          = hwmon_dev_attrs,
  90         .is_visible     = hwmon_dev_name_is_visible,
  91 };
  92
  93 static const struct attribute_group *hwmon_dev_attr_groups[] = {
  94         &hwmon_dev_attr_group,
  95         NULL
  96 };
  97
  98 static void hwmon_dev_release(struct device *dev)
  99 {
 100         kfree(to_hwmon_device(dev));
 101 }
 102
 103 static struct class hwmon_class = {
 104         .name = "hwmon",
 105         .owner = THIS_MODULE,
 106         .dev_groups = hwmon_dev_attr_groups,
 107         .dev_release = hwmon_dev_release,
 108 };
 109
 110 static DEFINE_IDA(hwmon_ida);
 111
 112 /* Thermal zone handling */
 113
 114 /*
 115  * The complex conditional is necessary to avoid a cyclic dependency
 116  * between hwmon and thermal_sys modules.
 117  */
 118 #ifdef CONFIG_THERMAL_OF
 119 static int hwmon_thermal_get_temp(void *data, int *temp)
 120 {
 121         struct hwmon_thermal_data *tdata = data;
 122         struct hwmon_device *hwdev = tdata->hwdev;
 123         int ret;
 124         long t;
 125
 126         ret = hwdev->chip->ops->read(&hwdev->dev, hwmon_temp, hwmon_temp_input,
 127                                      tdata->index, &t);
 128         if (ret < 0)
 129                 return ret;
 130
 131         *temp = t;
 132
 133         return 0;
 134 }
 135
 136 static const struct thermal_zone_of_device_ops hwmon_thermal_ops = {
 137         .get_temp = hwmon_thermal_get_temp,
 138 };
 139
 140 static int hwmon_thermal_add_sensor(struct device *dev,
 141                                     struct hwmon_device *hwdev, int index)
 142 {
 143         struct hwmon_thermal_data *tdata;
 144         struct thermal_zone_device *tzd;
 145
 146         tdata = devm_kzalloc(dev, sizeof(*tdata), GFP_KERNEL);
 147         if (!tdata)
 148                 return -ENOMEM;
 149
 150         tdata->hwdev = hwdev;
 151         tdata->index = index;
 152
 153         tzd = devm_thermal_zone_of_sensor_register(&hwdev->dev, index, tdata,
 154                                                    &hwmon_thermal_ops);
 155         /*
 156          * If CONFIG_THERMAL_OF is disabled, this returns -ENODEV,
 157          * so ignore that error but forward any other error.
 158          */
 159         if (IS_ERR(tzd) && (PTR_ERR(tzd) != -ENODEV))
 160                 return PTR_ERR(tzd);
 161
 162         return 0;
 163 }
 164 #else
 165 static int hwmon_thermal_add_sensor(struct device *dev,
 166                                     struct hwmon_device *hwdev, int index)
 167 {
 168         return 0;
 169 }
 170 #endif /* IS_REACHABLE(CONFIG_THERMAL) && ... */
 171
 172 static int hwmon_attr_base(enum hwmon_sensor_types type)
 173 {
 174         if (type == hwmon_in)
 175                 return 0;
 176         return 1;
 177 }
 178
 179 /* sysfs attribute management */
 180
 181 static ssize_t hwmon_attr_show(struct device *dev,
 182                                struct device_attribute *devattr, char *buf)
 183 {
 184         struct hwmon_device_attribute *hattr = to_hwmon_attr(devattr);
 185         long val;
 186         int ret;
 187
 188         ret = hattr->ops->read(dev, hattr->type, hattr->attr, hattr->index,
 189                                &val);
 190         if (ret < 0)
 191                 return ret;
 192
 193         trace_hwmon_attr_show(hattr->index + hwmon_attr_base(hattr->type),
 194                               hattr->name, val);
 195
 196         return sprintf(buf, "%ld\n", val);
 197 }
 198
 199 static ssize_t hwmon_attr_show_string(struct device *dev,
 200                                       struct device_attribute *devattr,
 201                                       char *buf)
 202 {
 203         struct hwmon_device_attribute *hattr = to_hwmon_attr(devattr);
 204         enum hwmon_sensor_types type = hattr->type;
 205         const char *s;
 206         int ret;
 207
 208         ret = hattr->ops->read_string(dev, hattr->type, hattr->attr,
 209                                       hattr->index, &s);
 210         if (ret < 0)
 211                 return ret;
 212
 213         trace_hwmon_attr_show_string(hattr->index + hwmon_attr_base(type),
 214                                      hattr->name, s);
 215
 216         return sprintf(buf, "%s\n", s);
 217 }
 218
 219 static ssize_t hwmon_attr_store(struct device *dev,
 220                                 struct device_attribute *devattr,
 221                                 const char *buf, size_t count)
 222 {
 223         struct hwmon_device_attribute *hattr = to_hwmon_attr(devattr);
 224         long val;
 225         int ret;
 226
 227         ret = kstrtol(buf, 10, &val);
 228         if (ret < 0)
 229                 return ret;
 230
 231         ret = hattr->ops->write(dev, hattr->type, hattr->attr, hattr->index,
 232                                 val);
 233         if (ret < 0)
 234                 return ret;
 235
 236         trace_hwmon_attr_store(hattr->index + hwmon_attr_base(hattr->type),
 237                                hattr->name, val);
 238
 239         return count;
 240 }
 241
 242 static bool is_string_attr(enum hwmon_sensor_types type, u32 attr)
 243 {
 244         return (type == hwmon_temp && attr == hwmon_temp_label) ||
 245                (type == hwmon_in && attr == hwmon_in_label) ||
 246                (type == hwmon_curr && attr == hwmon_curr_label) ||
 247                (type == hwmon_power && attr == hwmon_power_label) ||
 248                (type == hwmon_energy && attr == hwmon_energy_label) ||
 249                (type == hwmon_humidity && attr == hwmon_humidity_label) ||
 250                (type == hwmon_fan && attr == hwmon_fan_label);
 251 }
 252
 253 static struct attribute *hwmon_genattr(struct device *dev,
 254                                        const void *drvdata,
 255                                        enum hwmon_sensor_types type,
 256                                        u32 attr,
 257                                        int index,
 258                                        const char *template,
 259                                        const struct hwmon_ops *ops)
 260 {
 261         struct hwmon_device_attribute *hattr;
 262         struct device_attribute *dattr;
 263         struct attribute *a;
 264         umode_t mode;
 265         const char *name;
 266         bool is_string = is_string_attr(type, attr);
 267
 268         /* The attribute is invisible if there is no template string */
 269         if (!template)
 270                 return ERR_PTR(-ENOENT);
 271
 272         mode = ops->is_visible(drvdata, type, attr, index);
 273         if (!mode)
 274                 return ERR_PTR(-ENOENT);
 275
 276         if ((mode & 0444) && ((is_string && !ops->read_string) ||
 277                                  (!is_string && !ops->read)))
 278                 return ERR_PTR(-EINVAL);
 279         if ((mode & 0222) && !ops->write)
 280                 return ERR_PTR(-EINVAL);
 281
 282         hattr = devm_kzalloc(dev, sizeof(*hattr), GFP_KERNEL);
 283         if (!hattr)
 284                 return ERR_PTR(-ENOMEM);
 285
 286         if (type == hwmon_chip) {
 287                 name = template;
 288         } else {
 289                 scnprintf(hattr->name, sizeof(hattr->name), template,
 290                           index + hwmon_attr_base(type));
 291                 name = hattr->name;
 292         }
 293
 294         hattr->type = type;
 295         hattr->attr = attr;
 296         hattr->index = index;
 297         hattr->ops = ops;
 298
 299         dattr = &hattr->dev_attr;
 300         dattr->show = is_string ? hwmon_attr_show_string : hwmon_attr_show;
 301         dattr->store = hwmon_attr_store;
 302
 303         a = &dattr->attr;
 304         sysfs_attr_init(a);
 305         a->name = name;
 306         a->mode = mode;
 307
 308         return a;
 309 }
 310
 311 /*
 312  * Chip attributes are not attribute templates but actual sysfs attributes.
 313  * See hwmon_genattr() for special handling.
 314  */
 315 static const char * const hwmon_chip_attrs[] = {
 316         [hwmon_chip_temp_reset_history] = "temp_reset_history",
 317         [hwmon_chip_in_reset_history] = "in_reset_history",
 318         [hwmon_chip_curr_reset_history] = "curr_reset_history",
 319         [hwmon_chip_power_reset_history] = "power_reset_history",
 320         [hwmon_chip_update_interval] = "update_interval",
 321         [hwmon_chip_alarms] = "alarms",
 322         [hwmon_chip_samples] = "samples",
 323         [hwmon_chip_curr_samples] = "curr_samples",
 324         [hwmon_chip_in_samples] = "in_samples",
 325         [hwmon_chip_power_samples] = "power_samples",
 326         [hwmon_chip_temp_samples] = "temp_samples",
 327 };
 328
 329 static const char * const hwmon_temp_attr_templates[] = {
 330         [hwmon_temp_input] = "temp%d_input",
 331         [hwmon_temp_type] = "temp%d_type",
 332         [hwmon_temp_lcrit] = "temp%d_lcrit",
 333         [hwmon_temp_lcrit_hyst] = "temp%d_lcrit_hyst",
 334         [hwmon_temp_min] = "temp%d_min",
 335         [hwmon_temp_min_hyst] = "temp%d_min_hyst",
 336         [hwmon_temp_max] = "temp%d_max",
 337         [hwmon_temp_max_hyst] = "temp%d_max_hyst",
 338         [hwmon_temp_crit] = "temp%d_crit",
 339         [hwmon_temp_crit_hyst] = "temp%d_crit_hyst",
 340         [hwmon_temp_emergency] = "temp%d_emergency",
 341         [hwmon_temp_emergency_hyst] = "temp%d_emergency_hyst",
 342         [hwmon_temp_alarm] = "temp%d_alarm",
 343         [hwmon_temp_lcrit_alarm] = "temp%d_lcrit_alarm",
 344         [hwmon_temp_min_alarm] = "temp%d_min_alarm",
 345         [hwmon_temp_max_alarm] = "temp%d_max_alarm",
 346         [hwmon_temp_crit_alarm] = "temp%d_crit_alarm",
 347         [hwmon_temp_emergency_alarm] = "temp%d_emergency_alarm",
 348         [hwmon_temp_fault] = "temp%d_fault",
 349         [hwmon_temp_offset] = "temp%d_offset",
 350         [hwmon_temp_label] = "temp%d_label",
 351         [hwmon_temp_lowest] = "temp%d_lowest",
 352         [hwmon_temp_highest] = "temp%d_highest",
 353         [hwmon_temp_reset_history] = "temp%d_reset_history",
 354 };
 355
 356 static const char * const hwmon_in_attr_templates[] = {
 357         [hwmon_in_input] = "in%d_input",
 358         [hwmon_in_min] = "in%d_min",
 359         [hwmon_in_max] = "in%d_max",
 360         [hwmon_in_lcrit] = "in%d_lcrit",
 361         [hwmon_in_crit] = "in%d_crit",
 362         [hwmon_in_average] = "in%d_average",
 363         [hwmon_in_lowest] = "in%d_lowest",
 364         [hwmon_in_highest] = "in%d_highest",
 365         [hwmon_in_reset_history] = "in%d_reset_history",
 366         [hwmon_in_label] = "in%d_label",
 367         [hwmon_in_alarm] = "in%d_alarm",
 368         [hwmon_in_min_alarm] = "in%d_min_alarm",
 369         [hwmon_in_max_alarm] = "in%d_max_alarm",
 370         [hwmon_in_lcrit_alarm] = "in%d_lcrit_alarm",
 371         [hwmon_in_crit_alarm] = "in%d_crit_alarm",
 372         [hwmon_in_enable] = "in%d_enable",
 373 };
 374
 375 static const char * const hwmon_curr_attr_templates[] = {
 376         [hwmon_curr_input] = "curr%d_input",
 377         [hwmon_curr_min] = "curr%d_min",
 378         [hwmon_curr_max] = "curr%d_max",
 379         [hwmon_curr_lcrit] = "curr%d_lcrit",
 380         [hwmon_curr_crit] = "curr%d_crit",
 381         [hwmon_curr_average] = "curr%d_average",
 382         [hwmon_curr_lowest] = "curr%d_lowest",
 383         [hwmon_curr_highest] = "curr%d_highest",
 384         [hwmon_curr_reset_history] = "curr%d_reset_history",
 385         [hwmon_curr_label] = "curr%d_label",
 386         [hwmon_curr_alarm] = "curr%d_alarm",
 387         [hwmon_curr_min_alarm] = "curr%d_min_alarm",
 388         [hwmon_curr_max_alarm] = "curr%d_max_alarm",
 389         [hwmon_curr_lcrit_alarm] = "curr%d_lcrit_alarm",
 390         [hwmon_curr_crit_alarm] = "curr%d_crit_alarm",
 391 };
 392
 393 static const char * const hwmon_power_attr_templates[] = {
 394         [hwmon_power_average] = "power%d_average",
 395         [hwmon_power_average_interval] = "power%d_average_interval",
 396         [hwmon_power_average_interval_max] = "power%d_interval_max",
 397         [hwmon_power_average_interval_min] = "power%d_interval_min",
 398         [hwmon_power_average_highest] = "power%d_average_highest",
 399         [hwmon_power_average_lowest] = "power%d_average_lowest",
 400         [hwmon_power_average_max] = "power%d_average_max",
 401         [hwmon_power_average_min] = "power%d_average_min",
 402         [hwmon_power_input] = "power%d_input",
 403         [hwmon_power_input_highest] = "power%d_input_highest",
 404         [hwmon_power_input_lowest] = "power%d_input_lowest",
 405         [hwmon_power_reset_history] = "power%d_reset_history",
 406         [hwmon_power_accuracy] = "power%d_accuracy",
 407         [hwmon_power_cap] = "power%d_cap",
 408         [hwmon_power_cap_hyst] = "power%d_cap_hyst",
 409         [hwmon_power_cap_max] = "power%d_cap_max",
 410         [hwmon_power_cap_min] = "power%d_cap_min",
 411         [hwmon_power_min] = "power%d_min",
 412         [hwmon_power_max] = "power%d_max",
 413         [hwmon_power_lcrit] = "power%d_lcrit",
 414         [hwmon_power_crit] = "power%d_crit",
 415         [hwmon_power_label] = "power%d_label",
 416         [hwmon_power_alarm] = "power%d_alarm",
 417         [hwmon_power_cap_alarm] = "power%d_cap_alarm",
 418         [hwmon_power_min_alarm] = "power%d_min_alarm",
 419         [hwmon_power_max_alarm] = "power%d_max_alarm",
 420         [hwmon_power_lcrit_alarm] = "power%d_lcrit_alarm",
 421         [hwmon_power_crit_alarm] = "power%d_crit_alarm",
 422 };
 423
 424 static const char * const hwmon_energy_attr_templates[] = {
 425         [hwmon_energy_input] = "energy%d_input",
 426         [hwmon_energy_label] = "energy%d_label",
 427 };
 428
 429 static const char * const hwmon_humidity_attr_templates[] = {
 430         [hwmon_humidity_input] = "humidity%d_input",
 431         [hwmon_humidity_label] = "humidity%d_label",
 432         [hwmon_humidity_min] = "humidity%d_min",
 433         [hwmon_humidity_min_hyst] = "humidity%d_min_hyst",
 434         [hwmon_humidity_max] = "humidity%d_max",
 435         [hwmon_humidity_max_hyst] = "humidity%d_max_hyst",
 436         [hwmon_humidity_alarm] = "humidity%d_alarm",
 437         [hwmon_humidity_fault] = "humidity%d_fault",
 438 };
 439
 440 static const char * const hwmon_fan_attr_templates[] = {
 441         [hwmon_fan_input] = "fan%d_input",
 442         [hwmon_fan_label] = "fan%d_label",
 443         [hwmon_fan_min] = "fan%d_min",
 444         [hwmon_fan_max] = "fan%d_max",
 445         [hwmon_fan_div] = "fan%d_div",
 446         [hwmon_fan_pulses] = "fan%d_pulses",
 447         [hwmon_fan_target] = "fan%d_target",
 448         [hwmon_fan_alarm] = "fan%d_alarm",
 449         [hwmon_fan_min_alarm] = "fan%d_min_alarm",
 450         [hwmon_fan_max_alarm] = "fan%d_max_alarm",
 451         [hwmon_fan_fault] = "fan%d_fault",
 452 };
 453
 454 static const char * const hwmon_pwm_attr_templates[] = {
 455         [hwmon_pwm_input] = "pwm%d",
 456         [hwmon_pwm_enable] = "pwm%d_enable",
 457         [hwmon_pwm_mode] = "pwm%d_mode",
 458         [hwmon_pwm_freq] = "pwm%d_freq",
 459 };
 460
 461 static const char * const *__templates[] = {
 462         [hwmon_chip] = hwmon_chip_attrs,
 463         [hwmon_temp] = hwmon_temp_attr_templates,
 464         [hwmon_in] = hwmon_in_attr_templates,
 465         [hwmon_curr] = hwmon_curr_attr_templates,
 466         [hwmon_power] = hwmon_power_attr_templates,
 467         [hwmon_energy] = hwmon_energy_attr_templates,
 468         [hwmon_humidity] = hwmon_humidity_attr_templates,
 469         [hwmon_fan] = hwmon_fan_attr_templates,
 470         [hwmon_pwm] = hwmon_pwm_attr_templates,
 471 };
 472
 473 static const int __templates_size[] = {
 474         [hwmon_chip] = ARRAY_SIZE(hwmon_chip_attrs),
 475         [hwmon_temp] = ARRAY_SIZE(hwmon_temp_attr_templates),
 476         [hwmon_in] = ARRAY_SIZE(hwmon_in_attr_templates),
 477         [hwmon_curr] = ARRAY_SIZE(hwmon_curr_attr_templates),
 478         [hwmon_power] = ARRAY_SIZE(hwmon_power_attr_templates),
 479         [hwmon_energy] = ARRAY_SIZE(hwmon_energy_attr_templates),
 480         [hwmon_humidity] = ARRAY_SIZE(hwmon_humidity_attr_templates),
 481         [hwmon_fan] = ARRAY_SIZE(hwmon_fan_attr_templates),
 482         [hwmon_pwm] = ARRAY_SIZE(hwmon_pwm_attr_templates),
 483 };
 484
 485 static int hwmon_num_channel_attrs(const struct hwmon_channel_info *info)
 486 {
 487         int i, n;
 488
 489         for (i = n = 0; info->config[i]; i++)
 490                 n += hweight32(info->config[i]);
 491
 492         return n;
 493 }
 494
 495 static int hwmon_genattrs(struct device *dev,
 496                           const void *drvdata,
 497                           struct attribute **attrs,
 498                           const struct hwmon_ops *ops,
 499                           const struct hwmon_channel_info *info)
 500 {
 501         const char * const *templates;
 502         int template_size;
 503         int i, aindex = 0;
 504
 505         if (info->type >= ARRAY_SIZE(__templates))
 506                 return -EINVAL;
 507
 508         templates = __templates[info->type];
 509         template_size = __templates_size[info->type];
 510
 511         for (i = 0; info->config[i]; i++) {
 512                 u32 attr_mask = info->config[i];
 513                 u32 attr;
 514
 515                 while (attr_mask) {
 516                         struct attribute *a;
 517
 518                         attr = __ffs(attr_mask);
 519                         attr_mask &= ~BIT(attr);
 520                         if (attr >= template_size)
 521                                 return -EINVAL;
 522                         a = hwmon_genattr(dev, drvdata, info->type, attr, i,
 523                                           templates[attr], ops);
 524                         if (IS_ERR(a)) {
 525                                 if (PTR_ERR(a) != -ENOENT)
 526                                         return PTR_ERR(a);
 527                                 continue;
 528                         }
 529                         attrs[aindex++] = a;
 530                 }
 531         }
 532         return aindex;
 533 }
 534
 535 static struct attribute **
 536 __hwmon_create_attrs(struct device *dev, const void *drvdata,
 537                      const struct hwmon_chip_info *chip)
 538 {
 539         int ret, i, aindex = 0, nattrs = 0;
 540         struct attribute **attrs;
 541
 542         for (i = 0; chip->info[i]; i++)
 543                 nattrs += hwmon_num_channel_attrs(chip->info[i]);
 544
 545         if (nattrs == 0)
 546                 return ERR_PTR(-EINVAL);
 547
 548         attrs = devm_kcalloc(dev, nattrs + 1, sizeof(*attrs), GFP_KERNEL);
 549         if (!attrs)
 550                 return ERR_PTR(-ENOMEM);
 551
 552         for (i = 0; chip->info[i]; i++) {
 553                 ret = hwmon_genattrs(dev, drvdata, &attrs[aindex], chip->ops,
 554                                      chip->info[i]);
 555                 if (ret < 0)
 556                         return ERR_PTR(ret);
 557                 aindex += ret;
 558         }
 559
 560         return attrs;
 561 }
 562
 563 static struct device *
 564 __hwmon_device_register(struct device *dev, const char *name, void *drvdata,
 565                         const struct hwmon_chip_info *chip,
 566                         const struct attribute_group **groups)
 567 {
 568         struct hwmon_device *hwdev;
 569         struct device *hdev;
 570         int i, j, err, id;
 571
 572         /* Complain about invalid characters in hwmon name attribute */
 573         if (name && (!strlen(name) || strpbrk(name, "-* \t\n")))
 574                 dev_warn(dev,
 575                          "hwmon: '%s' is not a valid name attribute, please fix\n",
 576                          name);
 577
 578         id = ida_simple_get(&hwmon_ida, 0, 0, GFP_KERNEL);
 579         if (id < 0)
 580                 return ERR_PTR(id);
 581
 582         hwdev = kzalloc(sizeof(*hwdev), GFP_KERNEL);
 583         if (hwdev == NULL) {
 584                 err = -ENOMEM;
 585                 goto ida_remove;
 586         }
 587
 588         hdev = &hwdev->dev;
 589
 590         if (chip) {
 591                 struct attribute **attrs;
 592                 int ngroups = 2; /* terminating NULL plus &hwdev->groups */
 593
 594                 if (groups)
 595                         for (i = 0; groups[i]; i++)
 596                                 ngroups++;
 597
 598                 hwdev->groups = devm_kcalloc(dev, ngroups, sizeof(*groups),
 599                                              GFP_KERNEL);
 600                 if (!hwdev->groups) {
 601                         err = -ENOMEM;
 602                         goto free_hwmon;
 603                 }
 604
 605                 attrs = __hwmon_create_attrs(dev, drvdata, chip);
 606                 if (IS_ERR(attrs)) {
 607                         err = PTR_ERR(attrs);
 608                         goto free_hwmon;
 609                 }
 610
 611                 hwdev->group.attrs = attrs;
 612                 ngroups = 0;
 613                 hwdev->groups[ngroups++] = &hwdev->group;
 614
 615                 if (groups) {
 616                         for (i = 0; groups[i]; i++)
 617                                 hwdev->groups[ngroups++] = groups[i];
 618                 }
 619
 620                 hdev->groups = hwdev->groups;
 621         } else {
 622                 hdev->groups = groups;
 623         }
 624
 625         hwdev->name = name;
 626         hdev->class = &hwmon_class;
 627         hdev->parent = dev;
 628         hdev->of_node = dev ? dev->of_node : NULL;
 629         hwdev->chip = chip;
 630         dev_set_drvdata(hdev, drvdata);
 631         dev_set_name(hdev, HWMON_ID_FORMAT, id);
 632         err = device_register(hdev);
 633         if (err)
 634                 goto free_hwmon;
 635
 636         if (dev && dev->of_node && chip && chip->ops->read &&
 637             chip->info[0]->type == hwmon_chip &&
 638             (chip->info[0]->config[0] & HWMON_C_REGISTER_TZ)) {
 639                 const struct hwmon_channel_info **info = chip->info;
 640
 641                 for (i = 1; info[i]; i++) {
 642                         if (info[i]->type != hwmon_temp)
 643                                 continue;
 644
 645                         for (j = 0; info[i]->config[j]; j++) {
 646                                 if (!chip->ops->is_visible(drvdata, hwmon_temp,
 647                                                            hwmon_temp_input, j))
 648                                         continue;
 649                                 if (info[i]->config[j] & HWMON_T_INPUT) {
 650                                         err = hwmon_thermal_add_sensor(dev,
 651                                                                 hwdev, j);
 652                                         if (err) {
 653                                                 device_unregister(hdev);
 654                                                 /*
 655                                                  * Don't worry about hwdev;
 656                                                  * hwmon_dev_release(), called
 657                                                  * from device_unregister(),
 658                                                  * will free it.
 659                                                  */
 660                                                 goto ida_remove;
 661                                         }
 662                                 }
 663                         }
 664                 }
 665         }
 666
 667         return hdev;
 668
 669 free_hwmon:
 670         kfree(hwdev);
 671 ida_remove:
 672         ida_simple_remove(&hwmon_ida, id);
 673         return ERR_PTR(err);
 674 }
 675
 676 /**
 677  * hwmon_device_register_with_groups - register w/ hwmon
 678  * @dev: the parent device
 679  * @name: hwmon name attribute
 680  * @drvdata: driver data to attach to created device
 681  * @groups: List of attribute groups to create
 682  *
 683  * hwmon_device_unregister() must be called when the device is no
 684  * longer needed.
 685  *
 686  * Returns the pointer to the new device.
 687  */
 688 struct device *
 689 hwmon_device_register_with_groups(struct device *dev, const char *name,
 690                                   void *drvdata,
 691                                   const struct attribute_group **groups)
 692 {
 693         if (!name)
 694                 return ERR_PTR(-EINVAL);
 695
 696         return __hwmon_device_register(dev, name, drvdata, NULL, groups);
 697 }
 698 EXPORT_SYMBOL_GPL(hwmon_device_register_with_groups);
 699
 700 /**
 701  * hwmon_device_register_with_info - register w/ hwmon
 702  * @dev: the parent device
 703  * @name: hwmon name attribute
 704  * @drvdata: driver data to attach to created device
 705  * @chip: pointer to hwmon chip information
 706  * @extra_groups: pointer to list of additional non-standard attribute groups
 707  *
 708  * hwmon_device_unregister() must be called when the device is no
 709  * longer needed.
 710  *
 711  * Returns the pointer to the new device.
 712  */
 713 struct device *
 714 hwmon_device_register_with_info(struct device *dev, const char *name,
 715                                 void *drvdata,
 716                                 const struct hwmon_chip_info *chip,
 717                                 const struct attribute_group **extra_groups)
 718 {
 719         if (!name)
 720                 return ERR_PTR(-EINVAL);
 721
 722         if (chip && (!chip->ops || !chip->ops->is_visible || !chip->info))
 723                 return ERR_PTR(-EINVAL);
 724
 725         if (chip && !dev)
 726                 return ERR_PTR(-EINVAL);
 727
 728         return __hwmon_device_register(dev, name, drvdata, chip, extra_groups);
 729 }
 730 EXPORT_SYMBOL_GPL(hwmon_device_register_with_info);
 731
 732 /**
 733  * hwmon_device_register - register w/ hwmon
 734  * @dev: the device to register
 735  *
 736  * hwmon_device_unregister() must be called when the device is no
 737  * longer needed.
 738  *
 739  * Returns the pointer to the new device.
 740  */
 741 struct device *hwmon_device_register(struct device *dev)
 742 {
 743         dev_warn(dev,
 744                  "hwmon_device_register() is deprecated. Please convert the driver to use hwmon_device_register_with_info().\n");
 745
 746         return __hwmon_device_register(dev, NULL, NULL, NULL, NULL);
 747 }
 748 EXPORT_SYMBOL_GPL(hwmon_device_register);
 749
 750 /**
 751  * hwmon_device_unregister - removes the previously registered class device
 752  *
 753  * @dev: the class device to destroy
 754  */
 755 void hwmon_device_unregister(struct device *dev)
 756 {
 757         int id;
 758
 759         if (likely(sscanf(dev_name(dev), HWMON_ID_FORMAT, &id) == 1)) {
 760                 device_unregister(dev);
 761                 ida_simple_remove(&hwmon_ida, id);
 762         } else
 763                 dev_dbg(dev->parent,
 764                         "hwmon_device_unregister() failed: bad class ID!\n");
 765 }
 766 EXPORT_SYMBOL_GPL(hwmon_device_unregister);
 767
 768 static void devm_hwmon_release(struct device *dev, void *res)
 769 {
 770         struct device *hwdev = *(struct device **)res;
 771
 772         hwmon_device_unregister(hwdev);
 773 }
 774
 775 /**
 776  * devm_hwmon_device_register_with_groups - register w/ hwmon
 777  * @dev: the parent device
 778  * @name: hwmon name attribute
 779  * @drvdata: driver data to attach to created device
 780  * @groups: List of attribute groups to create
 781  *
 782  * Returns the pointer to the new device. The new device is automatically
 783  * unregistered with the parent device.
 784  */
 785 struct device *
 786 devm_hwmon_device_register_with_groups(struct device *dev, const char *name,
 787                                        void *drvdata,
 788                                        const struct attribute_group **groups)
 789 {
 790         struct device **ptr, *hwdev;
 791
 792         if (!dev)
 793                 return ERR_PTR(-EINVAL);
 794
 795         ptr = devres_alloc(devm_hwmon_release, sizeof(*ptr), GFP_KERNEL);
 796         if (!ptr)
 797                 return ERR_PTR(-ENOMEM);
 798
 799         hwdev = hwmon_device_register_with_groups(dev, name, drvdata, groups);
 800         if (IS_ERR(hwdev))
 801                 goto error;
 802
 803         *ptr = hwdev;
 804         devres_add(dev, ptr);
 805         return hwdev;
 806
 807 error:
 808         devres_free(ptr);
 809         return hwdev;
 810 }
 811 EXPORT_SYMBOL_GPL(devm_hwmon_device_register_with_groups);
 812
 813 /**
 814  * devm_hwmon_device_register_with_info - register w/ hwmon
 815  * @dev:        the parent device
 816  * @name:       hwmon name attribute
 817  * @drvdata:    driver data to attach to created device
 818  * @chip:       pointer to hwmon chip information
 819  * @groups:     pointer to list of driver specific attribute groups
 820  *
 821  * Returns the pointer to the new device. The new device is automatically
 822  * unregistered with the parent device.
 823  */
 824 struct device *
 825 devm_hwmon_device_register_with_info(struct device *dev, const char *name,
 826                                      void *drvdata,
 827                                      const struct hwmon_chip_info *chip,
 828                                      const struct attribute_group **groups)
 829 {
 830         struct device **ptr, *hwdev;
 831
 832         if (!dev)
 833                 return ERR_PTR(-EINVAL);
 834
 835         ptr = devres_alloc(devm_hwmon_release, sizeof(*ptr), GFP_KERNEL);
 836         if (!ptr)
 837                 return ERR_PTR(-ENOMEM);
 838
 839         hwdev = hwmon_device_register_with_info(dev, name, drvdata, chip,
 840                                                 groups);
 841         if (IS_ERR(hwdev))
 842                 goto error;
 843
 844         *ptr = hwdev;
 845         devres_add(dev, ptr);
 846
 847         return hwdev;
 848
 849 error:
 850         devres_free(ptr);
 851         return hwdev;
 852 }
 853 EXPORT_SYMBOL_GPL(devm_hwmon_device_register_with_info);
 854
 855 static int devm_hwmon_match(struct device *dev, void *res, void *data)
 856 {
 857         struct device **hwdev = res;
 858
 859         return *hwdev == data;
 860 }
 861
 862 /**
 863  * devm_hwmon_device_unregister - removes a previously registered hwmon device
 864  *
 865  * @dev: the parent device of the device to unregister
 866  */
 867 void devm_hwmon_device_unregister(struct device *dev)
 868 {
 869         WARN_ON(devres_release(dev, devm_hwmon_release, devm_hwmon_match, dev));
 870 }
 871 EXPORT_SYMBOL_GPL(devm_hwmon_device_unregister);
 872
 873 static void __init hwmon_pci_quirks(void)
 874 {
 875 #if defined CONFIG_X86 && defined CONFIG_PCI
 876         struct pci_dev *sb;
 877         u16 base;
 878         u8 enable;
 879
 880         /* Open access to 0x295-0x296 on MSI MS-7031 */
 881         sb = pci_get_device(PCI_VENDOR_ID_ATI, 0x436c, NULL);
 882         if (sb) {
 883                 if (sb->subsystem_vendor == 0x1462 &&   /* MSI */
 884                     sb->subsystem_device == 0x0031) {   /* MS-7031 */
 885                         pci_read_config_byte(sb, 0x48, &enable);
 886                         pci_read_config_word(sb, 0x64, &base);
 887
 888                         if (base == 0 && !(enable & BIT(2))) {
 889                                 dev_info(&sb->dev,
 890                                          "Opening wide generic port at 0x295\n");
 891                                 pci_write_config_word(sb, 0x64, 0x295);
 892                                 pci_write_config_byte(sb, 0x48,
 893                                                       enable | BIT(2));
 894                         }
 895                 }
 896                 pci_dev_put(sb);
 897         }
 898 #endif
 899 }
 900
 901 static int __init hwmon_init(void)
 902 {
 903         int err;
 904
 905         hwmon_pci_quirks();
 906
 907         err = class_register(&hwmon_class);
 908         if (err) {
 909                 pr_err("couldn't register hwmon sysfs class\n");
 910                 return err;
 911         }
 912         return 0;
 913 }
 914
 915 static void __exit hwmon_exit(void)
 916 {
 917         class_unregister(&hwmon_class);
 918 }
 919
 920 subsys_initcall(hwmon_init);
 921 module_exit(hwmon_exit);
 922
 923 MODULE_AUTHOR("Mark M. Hoffman <mhoffman@lightlink.com>");
 924 MODULE_DESCRIPTION("hardware monitoring sysfs/class support");
 925 MODULE_LICENSE("GPL");
 926