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