drivers/hwmon/hwmon.c

   1 /*
   2  * hwmon.c - part of lm_sensors, Linux kernel modules for hardware monitoring
   3  *
   4  * This file defines the sysfs class "hwmon", for use by sensors drivers.
   5  *
   6  * Copyright (C) 2005 Mark M. Hoffman <mhoffman@lightlink.com>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; version 2 of the License.
  11  */
  12
  13 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  14
  15 #include <linux/bitops.h>
  16 #include <linux/device.h>
  17 #include <linux/err.h>
  18 #include <linux/gfp.h>
  19 #include <linux/hwmon.h>
  20 #include <linux/idr.h>
  21 #include <linux/module.h>
  22 #include <linux/pci.h>
  23 #include <linux/slab.h>
  24 #include <linux/string.h>
  25 #include <linux/thermal.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 #if IS_REACHABLE(CONFIG_THERMAL) && defined(CONFIG_THERMAL_OF) && \
 119         (!defined(CONFIG_THERMAL_HWMON) || \
 120          !(defined(MODULE) && IS_MODULE(CONFIG_THERMAL)))
 121 static int hwmon_thermal_get_temp(void *data, int *temp)
 122 {
 123         struct hwmon_thermal_data *tdata = data;
 124         struct hwmon_device *hwdev = tdata->hwdev;
 125         int ret;
 126         long t;
 127
 128         ret = hwdev->chip->ops->read(&hwdev->dev, hwmon_temp, hwmon_temp_input,
 129                                      tdata->index, &t);
 130         if (ret < 0)
 131                 return ret;
 132
 133         *temp = t;
 134
 135         return 0;
 136 }
 137
 138 static const struct thermal_zone_of_device_ops hwmon_thermal_ops = {
 139         .get_temp = hwmon_thermal_get_temp,
 140 };
 141
 142 static int hwmon_thermal_add_sensor(struct device *dev,
 143                                     struct hwmon_device *hwdev, int index)
 144 {
 145         struct hwmon_thermal_data *tdata;
 146
 147         tdata = devm_kzalloc(dev, sizeof(*tdata), GFP_KERNEL);
 148         if (!tdata)
 149                 return -ENOMEM;
 150
 151         tdata->hwdev = hwdev;
 152         tdata->index = index;
 153
 154         devm_thermal_zone_of_sensor_register(&hwdev->dev, index, tdata,
 155                                              &hwmon_thermal_ops);
 156
 157         return 0;
 158 }
 159 #else
 160 static int hwmon_thermal_add_sensor(struct device *dev,
 161                                     struct hwmon_device *hwdev, int index)
 162 {
 163         return 0;
 164 }
 165 #endif /* IS_REACHABLE(CONFIG_THERMAL) && ... */
 166
 167 /* sysfs attribute management */
 168
 169 static ssize_t hwmon_attr_show(struct device *dev,
 170                                struct device_attribute *devattr, char *buf)
 171 {
 172         struct hwmon_device_attribute *hattr = to_hwmon_attr(devattr);
 173         long val;
 174         int ret;
 175
 176         ret = hattr->ops->read(dev, hattr->type, hattr->attr, hattr->index,
 177                                &val);
 178         if (ret < 0)
 179                 return ret;
 180
 181         return sprintf(buf, "%ld\n", val);
 182 }
 183
 184 static ssize_t hwmon_attr_show_string(struct device *dev,
 185                                       struct device_attribute *devattr,
 186                                       char *buf)
 187 {
 188         struct hwmon_device_attribute *hattr = to_hwmon_attr(devattr);
 189         const char *s;
 190         int ret;
 191
 192         ret = hattr->ops->read_string(dev, hattr->type, hattr->attr,
 193                                       hattr->index, &s);
 194         if (ret < 0)
 195                 return ret;
 196
 197         return sprintf(buf, "%s\n", s);
 198 }
 199
 200 static ssize_t hwmon_attr_store(struct device *dev,
 201                                 struct device_attribute *devattr,
 202                                 const char *buf, size_t count)
 203 {
 204         struct hwmon_device_attribute *hattr = to_hwmon_attr(devattr);
 205         long val;
 206         int ret;
 207
 208         ret = kstrtol(buf, 10, &val);
 209         if (ret < 0)
 210                 return ret;
 211
 212         ret = hattr->ops->write(dev, hattr->type, hattr->attr, hattr->index,
 213                                 val);
 214         if (ret < 0)
 215                 return ret;
 216
 217         return count;
 218 }
 219
 220 static int hwmon_attr_base(enum hwmon_sensor_types type)
 221 {
 222         if (type == hwmon_in)
 223                 return 0;
 224         return 1;
 225 }
 226
 227 static bool is_string_attr(enum hwmon_sensor_types type, u32 attr)
 228 {
 229         return (type == hwmon_temp && attr == hwmon_temp_label) ||
 230                (type == hwmon_in && attr == hwmon_in_label) ||
 231                (type == hwmon_curr && attr == hwmon_curr_label) ||
 232                (type == hwmon_power && attr == hwmon_power_label) ||
 233                (type == hwmon_energy && attr == hwmon_energy_label) ||
 234                (type == hwmon_humidity && attr == hwmon_humidity_label) ||
 235                (type == hwmon_fan && attr == hwmon_fan_label);
 236 }
 237
 238 static struct attribute *hwmon_genattr(struct device *dev,
 239                                        const void *drvdata,
 240                                        enum hwmon_sensor_types type,
 241                                        u32 attr,
 242                                        int index,
 243                                        const char *template,
 244                                        const struct hwmon_ops *ops)
 245 {
 246         struct hwmon_device_attribute *hattr;
 247         struct device_attribute *dattr;
 248         struct attribute *a;
 249         umode_t mode;
 250         char *name;
 251         bool is_string = is_string_attr(type, attr);
 252
 253         /* The attribute is invisible if there is no template string */
 254         if (!template)
 255                 return ERR_PTR(-ENOENT);
 256
 257         mode = ops->is_visible(drvdata, type, attr, index);
 258         if (!mode)
 259                 return ERR_PTR(-ENOENT);
 260
 261         if ((mode & S_IRUGO) && ((is_string && !ops->read_string) ||
 262                                  (!is_string && !ops->read)))
 263                 return ERR_PTR(-EINVAL);
 264         if ((mode & S_IWUGO) && !ops->write)
 265                 return ERR_PTR(-EINVAL);
 266
 267         hattr = devm_kzalloc(dev, sizeof(*hattr), GFP_KERNEL);
 268         if (!hattr)
 269                 return ERR_PTR(-ENOMEM);
 270
 271         if (type == hwmon_chip) {
 272                 name = (char *)template;
 273         } else {
 274                 scnprintf(hattr->name, sizeof(hattr->name), template,
 275                           index + hwmon_attr_base(type));
 276                 name = hattr->name;
 277         }
 278
 279         hattr->type = type;
 280         hattr->attr = attr;
 281         hattr->index = index;
 282         hattr->ops = ops;
 283
 284         dattr = &hattr->dev_attr;
 285         dattr->show = is_string ? hwmon_attr_show_string : hwmon_attr_show;
 286         dattr->store = hwmon_attr_store;
 287
 288         a = &dattr->attr;
 289         sysfs_attr_init(a);
 290         a->name = name;
 291         a->mode = mode;
 292
 293         return a;
 294 }
 295
 296 /*
 297  * Chip attributes are not attribute templates but actual sysfs attributes.
 298  * See hwmon_genattr() for special handling.
 299  */
 300 static const char * const hwmon_chip_attrs[] = {
 301         [hwmon_chip_temp_reset_history] = "temp_reset_history",
 302         [hwmon_chip_in_reset_history] = "in_reset_history",
 303         [hwmon_chip_curr_reset_history] = "curr_reset_history",
 304         [hwmon_chip_power_reset_history] = "power_reset_history",
 305         [hwmon_chip_update_interval] = "update_interval",
 306         [hwmon_chip_alarms] = "alarms",
 307 };
 308
 309 static const char * const hwmon_temp_attr_templates[] = {
 310         [hwmon_temp_input] = "temp%d_input",
 311         [hwmon_temp_type] = "temp%d_type",
 312         [hwmon_temp_lcrit] = "temp%d_lcrit",
 313         [hwmon_temp_lcrit_hyst] = "temp%d_lcrit_hyst",
 314         [hwmon_temp_min] = "temp%d_min",
 315         [hwmon_temp_min_hyst] = "temp%d_min_hyst",
 316         [hwmon_temp_max] = "temp%d_max",
 317         [hwmon_temp_max_hyst] = "temp%d_max_hyst",
 318         [hwmon_temp_crit] = "temp%d_crit",
 319         [hwmon_temp_crit_hyst] = "temp%d_crit_hyst",
 320         [hwmon_temp_emergency] = "temp%d_emergency",
 321         [hwmon_temp_emergency_hyst] = "temp%d_emergency_hyst",
 322         [hwmon_temp_alarm] = "temp%d_alarm",
 323         [hwmon_temp_lcrit_alarm] = "temp%d_lcrit_alarm",
 324         [hwmon_temp_min_alarm] = "temp%d_min_alarm",
 325         [hwmon_temp_max_alarm] = "temp%d_max_alarm",
 326         [hwmon_temp_crit_alarm] = "temp%d_crit_alarm",
 327         [hwmon_temp_emergency_alarm] = "temp%d_emergency_alarm",
 328         [hwmon_temp_fault] = "temp%d_fault",
 329         [hwmon_temp_offset] = "temp%d_offset",
 330         [hwmon_temp_label] = "temp%d_label",
 331         [hwmon_temp_lowest] = "temp%d_lowest",
 332         [hwmon_temp_highest] = "temp%d_highest",
 333         [hwmon_temp_reset_history] = "temp%d_reset_history",
 334 };
 335
 336 static const char * const hwmon_in_attr_templates[] = {
 337         [hwmon_in_input] = "in%d_input",
 338         [hwmon_in_min] = "in%d_min",
 339         [hwmon_in_max] = "in%d_max",
 340         [hwmon_in_lcrit] = "in%d_lcrit",
 341         [hwmon_in_crit] = "in%d_crit",
 342         [hwmon_in_average] = "in%d_average",
 343         [hwmon_in_lowest] = "in%d_lowest",
 344         [hwmon_in_highest] = "in%d_highest",
 345         [hwmon_in_reset_history] = "in%d_reset_history",
 346         [hwmon_in_label] = "in%d_label",
 347         [hwmon_in_alarm] = "in%d_alarm",
 348         [hwmon_in_min_alarm] = "in%d_min_alarm",
 349         [hwmon_in_max_alarm] = "in%d_max_alarm",
 350         [hwmon_in_lcrit_alarm] = "in%d_lcrit_alarm",
 351         [hwmon_in_crit_alarm] = "in%d_crit_alarm",
 352 };
 353
 354 static const char * const hwmon_curr_attr_templates[] = {
 355         [hwmon_curr_input] = "curr%d_input",
 356         [hwmon_curr_min] = "curr%d_min",
 357         [hwmon_curr_max] = "curr%d_max",
 358         [hwmon_curr_lcrit] = "curr%d_lcrit",
 359         [hwmon_curr_crit] = "curr%d_crit",
 360         [hwmon_curr_average] = "curr%d_average",
 361         [hwmon_curr_lowest] = "curr%d_lowest",
 362         [hwmon_curr_highest] = "curr%d_highest",
 363         [hwmon_curr_reset_history] = "curr%d_reset_history",
 364         [hwmon_curr_label] = "curr%d_label",
 365         [hwmon_curr_alarm] = "curr%d_alarm",
 366         [hwmon_curr_min_alarm] = "curr%d_min_alarm",
 367         [hwmon_curr_max_alarm] = "curr%d_max_alarm",
 368         [hwmon_curr_lcrit_alarm] = "curr%d_lcrit_alarm",
 369         [hwmon_curr_crit_alarm] = "curr%d_crit_alarm",
 370 };
 371
 372 static const char * const hwmon_power_attr_templates[] = {
 373         [hwmon_power_average] = "power%d_average",
 374         [hwmon_power_average_interval] = "power%d_average_interval",
 375         [hwmon_power_average_interval_max] = "power%d_interval_max",
 376         [hwmon_power_average_interval_min] = "power%d_interval_min",
 377         [hwmon_power_average_highest] = "power%d_average_highest",
 378         [hwmon_power_average_lowest] = "power%d_average_lowest",
 379         [hwmon_power_average_max] = "power%d_average_max",
 380         [hwmon_power_average_min] = "power%d_average_min",
 381         [hwmon_power_input] = "power%d_input",
 382         [hwmon_power_input_highest] = "power%d_input_highest",
 383         [hwmon_power_input_lowest] = "power%d_input_lowest",
 384         [hwmon_power_reset_history] = "power%d_reset_history",
 385         [hwmon_power_accuracy] = "power%d_accuracy",
 386         [hwmon_power_cap] = "power%d_cap",
 387         [hwmon_power_cap_hyst] = "power%d_cap_hyst",
 388         [hwmon_power_cap_max] = "power%d_cap_max",
 389         [hwmon_power_cap_min] = "power%d_cap_min",
 390         [hwmon_power_max] = "power%d_max",
 391         [hwmon_power_crit] = "power%d_crit",
 392         [hwmon_power_label] = "power%d_label",
 393         [hwmon_power_alarm] = "power%d_alarm",
 394         [hwmon_power_cap_alarm] = "power%d_cap_alarm",
 395         [hwmon_power_max_alarm] = "power%d_max_alarm",
 396         [hwmon_power_crit_alarm] = "power%d_crit_alarm",
 397 };
 398
 399 static const char * const hwmon_energy_attr_templates[] = {
 400         [hwmon_energy_input] = "energy%d_input",
 401         [hwmon_energy_label] = "energy%d_label",
 402 };
 403
 404 static const char * const hwmon_humidity_attr_templates[] = {
 405         [hwmon_humidity_input] = "humidity%d_input",
 406         [hwmon_humidity_label] = "humidity%d_label",
 407         [hwmon_humidity_min] = "humidity%d_min",
 408         [hwmon_humidity_min_hyst] = "humidity%d_min_hyst",
 409         [hwmon_humidity_max] = "humidity%d_max",
 410         [hwmon_humidity_max_hyst] = "humidity%d_max_hyst",
 411         [hwmon_humidity_alarm] = "humidity%d_alarm",
 412         [hwmon_humidity_fault] = "humidity%d_fault",
 413 };
 414
 415 static const char * const hwmon_fan_attr_templates[] = {
 416         [hwmon_fan_input] = "fan%d_input",
 417         [hwmon_fan_label] = "fan%d_label",
 418         [hwmon_fan_min] = "fan%d_min",
 419         [hwmon_fan_max] = "fan%d_max",
 420         [hwmon_fan_div] = "fan%d_div",
 421         [hwmon_fan_pulses] = "fan%d_pulses",
 422         [hwmon_fan_target] = "fan%d_target",
 423         [hwmon_fan_alarm] = "fan%d_alarm",
 424         [hwmon_fan_min_alarm] = "fan%d_min_alarm",
 425         [hwmon_fan_max_alarm] = "fan%d_max_alarm",
 426         [hwmon_fan_fault] = "fan%d_fault",
 427 };
 428
 429 static const char * const hwmon_pwm_attr_templates[] = {
 430         [hwmon_pwm_input] = "pwm%d",
 431         [hwmon_pwm_enable] = "pwm%d_enable",
 432         [hwmon_pwm_mode] = "pwm%d_mode",
 433         [hwmon_pwm_freq] = "pwm%d_freq",
 434 };
 435
 436 static const char * const *__templates[] = {
 437         [hwmon_chip] = hwmon_chip_attrs,
 438         [hwmon_temp] = hwmon_temp_attr_templates,
 439         [hwmon_in] = hwmon_in_attr_templates,
 440         [hwmon_curr] = hwmon_curr_attr_templates,
 441         [hwmon_power] = hwmon_power_attr_templates,
 442         [hwmon_energy] = hwmon_energy_attr_templates,
 443         [hwmon_humidity] = hwmon_humidity_attr_templates,
 444         [hwmon_fan] = hwmon_fan_attr_templates,
 445         [hwmon_pwm] = hwmon_pwm_attr_templates,
 446 };
 447
 448 static const int __templates_size[] = {
 449         [hwmon_chip] = ARRAY_SIZE(hwmon_chip_attrs),
 450         [hwmon_temp] = ARRAY_SIZE(hwmon_temp_attr_templates),
 451         [hwmon_in] = ARRAY_SIZE(hwmon_in_attr_templates),
 452         [hwmon_curr] = ARRAY_SIZE(hwmon_curr_attr_templates),
 453         [hwmon_power] = ARRAY_SIZE(hwmon_power_attr_templates),
 454         [hwmon_energy] = ARRAY_SIZE(hwmon_energy_attr_templates),
 455         [hwmon_humidity] = ARRAY_SIZE(hwmon_humidity_attr_templates),
 456         [hwmon_fan] = ARRAY_SIZE(hwmon_fan_attr_templates),
 457         [hwmon_pwm] = ARRAY_SIZE(hwmon_pwm_attr_templates),
 458 };
 459
 460 static int hwmon_num_channel_attrs(const struct hwmon_channel_info *info)
 461 {
 462         int i, n;
 463
 464         for (i = n = 0; info->config[i]; i++)
 465                 n += hweight32(info->config[i]);
 466
 467         return n;
 468 }
 469
 470 static int hwmon_genattrs(struct device *dev,
 471                           const void *drvdata,
 472                           struct attribute **attrs,
 473                           const struct hwmon_ops *ops,
 474                           const struct hwmon_channel_info *info)
 475 {
 476         const char * const *templates;
 477         int template_size;
 478         int i, aindex = 0;
 479
 480         if (info->type >= ARRAY_SIZE(__templates))
 481                 return -EINVAL;
 482
 483         templates = __templates[info->type];
 484         template_size = __templates_size[info->type];
 485
 486         for (i = 0; info->config[i]; i++) {
 487                 u32 attr_mask = info->config[i];
 488                 u32 attr;
 489
 490                 while (attr_mask) {
 491                         struct attribute *a;
 492
 493                         attr = __ffs(attr_mask);
 494                         attr_mask &= ~BIT(attr);
 495                         if (attr >= template_size)
 496                                 return -EINVAL;
 497                         a = hwmon_genattr(dev, drvdata, info->type, attr, i,
 498                                           templates[attr], ops);
 499                         if (IS_ERR(a)) {
 500                                 if (PTR_ERR(a) != -ENOENT)
 501                                         return PTR_ERR(a);
 502                                 continue;
 503                         }
 504                         attrs[aindex++] = a;
 505                 }
 506         }
 507         return aindex;
 508 }
 509
 510 static struct attribute **
 511 __hwmon_create_attrs(struct device *dev, const void *drvdata,
 512                      const struct hwmon_chip_info *chip)
 513 {
 514         int ret, i, aindex = 0, nattrs = 0;
 515         struct attribute **attrs;
 516
 517         for (i = 0; chip->info[i]; i++)
 518                 nattrs += hwmon_num_channel_attrs(chip->info[i]);
 519
 520         if (nattrs == 0)
 521                 return ERR_PTR(-EINVAL);
 522
 523         attrs = devm_kcalloc(dev, nattrs + 1, sizeof(*attrs), GFP_KERNEL);
 524         if (!attrs)
 525                 return ERR_PTR(-ENOMEM);
 526
 527         for (i = 0; chip->info[i]; i++) {
 528                 ret = hwmon_genattrs(dev, drvdata, &attrs[aindex], chip->ops,
 529                                      chip->info[i]);
 530                 if (ret < 0)
 531                         return ERR_PTR(ret);
 532                 aindex += ret;
 533         }
 534
 535         return attrs;
 536 }
 537
 538 static struct device *
 539 __hwmon_device_register(struct device *dev, const char *name, void *drvdata,
 540                         const struct hwmon_chip_info *chip,
 541                         const struct attribute_group **groups)
 542 {
 543         struct hwmon_device *hwdev;
 544         struct device *hdev;
 545         int i, j, err, id;
 546
 547         /* Complain about invalid characters in hwmon name attribute */
 548         if (name && (!strlen(name) || strpbrk(name, "-* \t\n")))
 549                 dev_warn(dev,
 550                          "hwmon: '%s' is not a valid name attribute, please fix\n",
 551                          name);
 552
 553         id = ida_simple_get(&hwmon_ida, 0, 0, GFP_KERNEL);
 554         if (id < 0)
 555                 return ERR_PTR(id);
 556
 557         hwdev = kzalloc(sizeof(*hwdev), GFP_KERNEL);
 558         if (hwdev == NULL) {
 559                 err = -ENOMEM;
 560                 goto ida_remove;
 561         }
 562
 563         hdev = &hwdev->dev;
 564
 565         if (chip) {
 566                 struct attribute **attrs;
 567                 int ngroups = 2; /* terminating NULL plus &hwdev->groups */
 568
 569                 if (groups)
 570                         for (i = 0; groups[i]; i++)
 571                                 ngroups++;
 572
 573                 hwdev->groups = devm_kcalloc(dev, ngroups, sizeof(*groups),
 574                                              GFP_KERNEL);
 575                 if (!hwdev->groups) {
 576                         err = -ENOMEM;
 577                         goto free_hwmon;
 578                 }
 579
 580                 attrs = __hwmon_create_attrs(dev, drvdata, chip);
 581                 if (IS_ERR(attrs)) {
 582                         err = PTR_ERR(attrs);
 583                         goto free_hwmon;
 584                 }
 585
 586                 hwdev->group.attrs = attrs;
 587                 ngroups = 0;
 588                 hwdev->groups[ngroups++] = &hwdev->group;
 589
 590                 if (groups) {
 591                         for (i = 0; groups[i]; i++)
 592                                 hwdev->groups[ngroups++] = groups[i];
 593                 }
 594
 595                 hdev->groups = hwdev->groups;
 596         } else {
 597                 hdev->groups = groups;
 598         }
 599
 600         hwdev->name = name;
 601         hdev->class = &hwmon_class;
 602         hdev->parent = dev;
 603         hdev->of_node = dev ? dev->of_node : NULL;
 604         hwdev->chip = chip;
 605         dev_set_drvdata(hdev, drvdata);
 606         dev_set_name(hdev, HWMON_ID_FORMAT, id);
 607         err = device_register(hdev);
 608         if (err)
 609                 goto free_hwmon;
 610
 611         if (dev && chip && chip->ops->read &&
 612             chip->info[0]->type == hwmon_chip &&
 613             (chip->info[0]->config[0] & HWMON_C_REGISTER_TZ)) {
 614                 const struct hwmon_channel_info **info = chip->info;
 615
 616                 for (i = 1; info[i]; i++) {
 617                         if (info[i]->type != hwmon_temp)
 618                                 continue;
 619
 620                         for (j = 0; info[i]->config[j]; j++) {
 621                                 if (!chip->ops->is_visible(drvdata, hwmon_temp,
 622                                                            hwmon_temp_input, j))
 623                                         continue;
 624                                 if (info[i]->config[j] & HWMON_T_INPUT)
 625                                         hwmon_thermal_add_sensor(dev, hwdev, j);
 626                         }
 627                 }
 628         }
 629
 630         return hdev;
 631
 632 free_hwmon:
 633         kfree(hwdev);
 634 ida_remove:
 635         ida_simple_remove(&hwmon_ida, id);
 636         return ERR_PTR(err);
 637 }
 638
 639 /**
 640  * hwmon_device_register_with_groups - register w/ hwmon
 641  * @dev: the parent device
 642  * @name: hwmon name attribute
 643  * @drvdata: driver data to attach to created device
 644  * @groups: List of attribute groups to create
 645  *
 646  * hwmon_device_unregister() must be called when the device is no
 647  * longer needed.
 648  *
 649  * Returns the pointer to the new device.
 650  */
 651 struct device *
 652 hwmon_device_register_with_groups(struct device *dev, const char *name,
 653                                   void *drvdata,
 654                                   const struct attribute_group **groups)
 655 {
 656         if (!name)
 657                 return ERR_PTR(-EINVAL);
 658
 659         return __hwmon_device_register(dev, name, drvdata, NULL, groups);
 660 }
 661 EXPORT_SYMBOL_GPL(hwmon_device_register_with_groups);
 662
 663 /**
 664  * hwmon_device_register_with_info - register w/ hwmon
 665  * @dev: the parent device
 666  * @name: hwmon name attribute
 667  * @drvdata: driver data to attach to created device
 668  * @info: pointer to hwmon chip information
 669  * @extra_groups: pointer to list of additional non-standard attribute groups
 670  *
 671  * hwmon_device_unregister() must be called when the device is no
 672  * longer needed.
 673  *
 674  * Returns the pointer to the new device.
 675  */
 676 struct device *
 677 hwmon_device_register_with_info(struct device *dev, const char *name,
 678                                 void *drvdata,
 679                                 const struct hwmon_chip_info *chip,
 680                                 const struct attribute_group **extra_groups)
 681 {
 682         if (!name)
 683                 return ERR_PTR(-EINVAL);
 684
 685         if (chip && (!chip->ops || !chip->ops->is_visible || !chip->info))
 686                 return ERR_PTR(-EINVAL);
 687
 688         return __hwmon_device_register(dev, name, drvdata, chip, extra_groups);
 689 }
 690 EXPORT_SYMBOL_GPL(hwmon_device_register_with_info);
 691
 692 /**
 693  * hwmon_device_register - register w/ hwmon
 694  * @dev: the device to register
 695  *
 696  * hwmon_device_unregister() must be called when the device is no
 697  * longer needed.
 698  *
 699  * Returns the pointer to the new device.
 700  */
 701 struct device *hwmon_device_register(struct device *dev)
 702 {
 703         dev_warn(dev,
 704                  "hwmon_device_register() is deprecated. Please convert the driver to use hwmon_device_register_with_info().\n");
 705
 706         return __hwmon_device_register(dev, NULL, NULL, NULL, NULL);
 707 }
 708 EXPORT_SYMBOL_GPL(hwmon_device_register);
 709
 710 /**
 711  * hwmon_device_unregister - removes the previously registered class device
 712  *
 713  * @dev: the class device to destroy
 714  */
 715 void hwmon_device_unregister(struct device *dev)
 716 {
 717         int id;
 718
 719         if (likely(sscanf(dev_name(dev), HWMON_ID_FORMAT, &id) == 1)) {
 720                 device_unregister(dev);
 721                 ida_simple_remove(&hwmon_ida, id);
 722         } else
 723                 dev_dbg(dev->parent,
 724                         "hwmon_device_unregister() failed: bad class ID!\n");
 725 }
 726 EXPORT_SYMBOL_GPL(hwmon_device_unregister);
 727
 728 static void devm_hwmon_release(struct device *dev, void *res)
 729 {
 730         struct device *hwdev = *(struct device **)res;
 731
 732         hwmon_device_unregister(hwdev);
 733 }
 734
 735 /**
 736  * devm_hwmon_device_register_with_groups - register w/ hwmon
 737  * @dev: the parent device
 738  * @name: hwmon name attribute
 739  * @drvdata: driver data to attach to created device
 740  * @groups: List of attribute groups to create
 741  *
 742  * Returns the pointer to the new device. The new device is automatically
 743  * unregistered with the parent device.
 744  */
 745 struct device *
 746 devm_hwmon_device_register_with_groups(struct device *dev, const char *name,
 747                                        void *drvdata,
 748                                        const struct attribute_group **groups)
 749 {
 750         struct device **ptr, *hwdev;
 751
 752         if (!dev)
 753                 return ERR_PTR(-EINVAL);
 754
 755         ptr = devres_alloc(devm_hwmon_release, sizeof(*ptr), GFP_KERNEL);
 756         if (!ptr)
 757                 return ERR_PTR(-ENOMEM);
 758
 759         hwdev = hwmon_device_register_with_groups(dev, name, drvdata, groups);
 760         if (IS_ERR(hwdev))
 761                 goto error;
 762
 763         *ptr = hwdev;
 764         devres_add(dev, ptr);
 765         return hwdev;
 766
 767 error:
 768         devres_free(ptr);
 769         return hwdev;
 770 }
 771 EXPORT_SYMBOL_GPL(devm_hwmon_device_register_with_groups);
 772
 773 /**
 774  * devm_hwmon_device_register_with_info - register w/ hwmon
 775  * @dev: the parent device
 776  * @name: hwmon name attribute
 777  * @drvdata: driver data to attach to created device
 778  * @info: Pointer to hwmon chip information
 779  * @groups - pointer to list of driver specific attribute groups
 780  *
 781  * Returns the pointer to the new device. The new device is automatically
 782  * unregistered with the parent device.
 783  */
 784 struct device *
 785 devm_hwmon_device_register_with_info(struct device *dev, const char *name,
 786                                      void *drvdata,
 787                                      const struct hwmon_chip_info *chip,
 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_info(dev, name, drvdata, chip,
 800                                                 groups);
 801         if (IS_ERR(hwdev))
 802                 goto error;
 803
 804         *ptr = hwdev;
 805         devres_add(dev, ptr);
 806
 807         return hwdev;
 808
 809 error:
 810         devres_free(ptr);
 811         return hwdev;
 812 }
 813 EXPORT_SYMBOL_GPL(devm_hwmon_device_register_with_info);
 814
 815 static int devm_hwmon_match(struct device *dev, void *res, void *data)
 816 {
 817         struct device **hwdev = res;
 818
 819         return *hwdev == data;
 820 }
 821
 822 /**
 823  * devm_hwmon_device_unregister - removes a previously registered hwmon device
 824  *
 825  * @dev: the parent device of the device to unregister
 826  */
 827 void devm_hwmon_device_unregister(struct device *dev)
 828 {
 829         WARN_ON(devres_release(dev, devm_hwmon_release, devm_hwmon_match, dev));
 830 }
 831 EXPORT_SYMBOL_GPL(devm_hwmon_device_unregister);
 832
 833 static void __init hwmon_pci_quirks(void)
 834 {
 835 #if defined CONFIG_X86 && defined CONFIG_PCI
 836         struct pci_dev *sb;
 837         u16 base;
 838         u8 enable;
 839
 840         /* Open access to 0x295-0x296 on MSI MS-7031 */
 841         sb = pci_get_device(PCI_VENDOR_ID_ATI, 0x436c, NULL);
 842         if (sb) {
 843                 if (sb->subsystem_vendor == 0x1462 &&   /* MSI */
 844                     sb->subsystem_device == 0x0031) {   /* MS-7031 */
 845                         pci_read_config_byte(sb, 0x48, &enable);
 846                         pci_read_config_word(sb, 0x64, &base);
 847
 848                         if (base == 0 && !(enable & BIT(2))) {
 849                                 dev_info(&sb->dev,
 850                                          "Opening wide generic port at 0x295\n");
 851                                 pci_write_config_word(sb, 0x64, 0x295);
 852                                 pci_write_config_byte(sb, 0x48,
 853                                                       enable | BIT(2));
 854                         }
 855                 }
 856                 pci_dev_put(sb);
 857         }
 858 #endif
 859 }
 860
 861 static int __init hwmon_init(void)
 862 {
 863         int err;
 864
 865         hwmon_pci_quirks();
 866
 867         err = class_register(&hwmon_class);
 868         if (err) {
 869                 pr_err("couldn't register hwmon sysfs class\n");
 870                 return err;
 871         }
 872         return 0;
 873 }
 874
 875 static void __exit hwmon_exit(void)
 876 {
 877         class_unregister(&hwmon_class);
 878 }
 879
 880 subsys_initcall(hwmon_init);
 881 module_exit(hwmon_exit);
 882
 883 MODULE_AUTHOR("Mark M. Hoffman <mhoffman@lightlink.com>");
 884 MODULE_DESCRIPTION("hardware monitoring sysfs/class support");
 885 MODULE_LICENSE("GPL");
 886