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 struct hwmon_device_attribute {
  42         struct device_attribute dev_attr;
  43         const struct hwmon_ops *ops;
  44         enum hwmon_sensor_types type;
  45         u32 attr;
  46         int index;
  47 };
  48
  49 #define to_hwmon_attr(d) \
  50         container_of(d, struct hwmon_device_attribute, dev_attr)
  51
  52 /*
  53  * Thermal zone information
  54  * In addition to the reference to the hwmon device,
  55  * also provides the sensor index.
  56  */
  57 struct hwmon_thermal_data {
  58         struct hwmon_device *hwdev;     /* Reference to hwmon device */
  59         int index;                      /* sensor index */
  60 };
  61
  62 static ssize_t
  63 show_name(struct device *dev, struct device_attribute *attr, char *buf)
  64 {
  65         return sprintf(buf, "%s\n", to_hwmon_device(dev)->name);
  66 }
  67 static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
  68
  69 static struct attribute *hwmon_dev_attrs[] = {
  70         &dev_attr_name.attr,
  71         NULL
  72 };
  73
  74 static umode_t hwmon_dev_name_is_visible(struct kobject *kobj,
  75                                          struct attribute *attr, int n)
  76 {
  77         struct device *dev = container_of(kobj, struct device, kobj);
  78
  79         if (to_hwmon_device(dev)->name == NULL)
  80                 return 0;
  81
  82         return attr->mode;
  83 }
  84
  85 static struct attribute_group hwmon_dev_attr_group = {
  86         .attrs          = hwmon_dev_attrs,
  87         .is_visible     = hwmon_dev_name_is_visible,
  88 };
  89
  90 static const struct attribute_group *hwmon_dev_attr_groups[] = {
  91         &hwmon_dev_attr_group,
  92         NULL
  93 };
  94
  95 static void hwmon_dev_release(struct device *dev)
  96 {
  97         kfree(to_hwmon_device(dev));
  98 }
  99
 100 static struct class hwmon_class = {
 101         .name = "hwmon",
 102         .owner = THIS_MODULE,
 103         .dev_groups = hwmon_dev_attr_groups,
 104         .dev_release = hwmon_dev_release,
 105 };
 106
 107 static DEFINE_IDA(hwmon_ida);
 108
 109 /* Thermal zone handling */
 110
 111 /*
 112  * The complex conditional is necessary to avoid a cyclic dependency
 113  * between hwmon and thermal_sys modules.
 114  */
 115 #if IS_REACHABLE(CONFIG_THERMAL) && defined(CONFIG_THERMAL_OF) && \
 116         (!defined(CONFIG_THERMAL_HWMON) || \
 117          !(defined(MODULE) && IS_MODULE(CONFIG_THERMAL)))
 118 static int hwmon_thermal_get_temp(void *data, int *temp)
 119 {
 120         struct hwmon_thermal_data *tdata = data;
 121         struct hwmon_device *hwdev = tdata->hwdev;
 122         int ret;
 123         long t;
 124
 125         ret = hwdev->chip->ops->read(&hwdev->dev, hwmon_temp, hwmon_temp_input,
 126                                      tdata->index, &t);
 127         if (ret < 0)
 128                 return ret;
 129
 130         *temp = t;
 131
 132         return 0;
 133 }
 134
 135 static struct thermal_zone_of_device_ops hwmon_thermal_ops = {
 136         .get_temp = hwmon_thermal_get_temp,
 137 };
 138
 139 static int hwmon_thermal_add_sensor(struct device *dev,
 140                                     struct hwmon_device *hwdev, int index)
 141 {
 142         struct hwmon_thermal_data *tdata;
 143
 144         tdata = devm_kzalloc(dev, sizeof(*tdata), GFP_KERNEL);
 145         if (!tdata)
 146                 return -ENOMEM;
 147
 148         tdata->hwdev = hwdev;
 149         tdata->index = index;
 150
 151         devm_thermal_zone_of_sensor_register(&hwdev->dev, index, tdata,
 152                                              &hwmon_thermal_ops);
 153
 154         return 0;
 155 }
 156 #else
 157 static int hwmon_thermal_add_sensor(struct device *dev,
 158                                     struct hwmon_device *hwdev, int index)
 159 {
 160         return 0;
 161 }
 162 #endif /* IS_REACHABLE(CONFIG_THERMAL) && ... */
 163
 164 /* sysfs attribute management */
 165
 166 static ssize_t hwmon_attr_show(struct device *dev,
 167                                struct device_attribute *devattr, char *buf)
 168 {
 169         struct hwmon_device_attribute *hattr = to_hwmon_attr(devattr);
 170         long val;
 171         int ret;
 172
 173         ret = hattr->ops->read(dev, hattr->type, hattr->attr, hattr->index,
 174                                &val);
 175         if (ret < 0)
 176                 return ret;
 177
 178         return sprintf(buf, "%ld\n", val);
 179 }
 180
 181 static ssize_t hwmon_attr_show_string(struct device *dev,
 182                                       struct device_attribute *devattr,
 183                                       char *buf)
 184 {
 185         struct hwmon_device_attribute *hattr = to_hwmon_attr(devattr);
 186         char *s;
 187         int ret;
 188
 189         ret = hattr->ops->read_string(dev, hattr->type, hattr->attr,
 190                                       hattr->index, &s);
 191         if (ret < 0)
 192                 return ret;
 193
 194         return sprintf(buf, "%s\n", s);
 195 }
 196
 197 static ssize_t hwmon_attr_store(struct device *dev,
 198                                 struct device_attribute *devattr,
 199                                 const char *buf, size_t count)
 200 {
 201         struct hwmon_device_attribute *hattr = to_hwmon_attr(devattr);
 202         long val;
 203         int ret;
 204
 205         ret = kstrtol(buf, 10, &val);
 206         if (ret < 0)
 207                 return ret;
 208
 209         ret = hattr->ops->write(dev, hattr->type, hattr->attr, hattr->index,
 210                                 val);
 211         if (ret < 0)
 212                 return ret;
 213
 214         return count;
 215 }
 216
 217 static int hwmon_attr_base(enum hwmon_sensor_types type)
 218 {
 219         if (type == hwmon_in)
 220                 return 0;
 221         return 1;
 222 }
 223
 224 static bool is_string_attr(enum hwmon_sensor_types type, u32 attr)
 225 {
 226         return (type == hwmon_temp && attr == hwmon_temp_label) ||
 227                (type == hwmon_in && attr == hwmon_in_label) ||
 228                (type == hwmon_curr && attr == hwmon_curr_label) ||
 229                (type == hwmon_power && attr == hwmon_power_label) ||
 230                (type == hwmon_energy && attr == hwmon_energy_label) ||
 231                (type == hwmon_humidity && attr == hwmon_humidity_label) ||
 232                (type == hwmon_fan && attr == hwmon_fan_label);
 233 }
 234
 235 static struct attribute *hwmon_genattr(struct device *dev,
 236                                        const void *drvdata,
 237                                        enum hwmon_sensor_types type,
 238                                        u32 attr,
 239                                        int index,
 240                                        const char *template,
 241                                        const struct hwmon_ops *ops)
 242 {
 243         struct hwmon_device_attribute *hattr;
 244         struct device_attribute *dattr;
 245         struct attribute *a;
 246         umode_t mode;
 247         char *name;
 248         bool is_string = is_string_attr(type, attr);
 249
 250         /* The attribute is invisible if there is no template string */
 251         if (!template)
 252                 return ERR_PTR(-ENOENT);
 253
 254         mode = ops->is_visible(drvdata, type, attr, index);
 255         if (!mode)
 256                 return ERR_PTR(-ENOENT);
 257
 258         if ((mode & S_IRUGO) && ((is_string && !ops->read_string) ||
 259                                  (!is_string && !ops->read)))
 260                 return ERR_PTR(-EINVAL);
 261         if ((mode & S_IWUGO) && !ops->write)
 262                 return ERR_PTR(-EINVAL);
 263
 264         if (type == hwmon_chip) {
 265                 name = (char *)template;
 266         } else {
 267                 name = devm_kzalloc(dev, strlen(template) + 16, GFP_KERNEL);
 268                 if (!name)
 269                         return ERR_PTR(-ENOMEM);
 270                 scnprintf(name, strlen(template) + 16, template,
 271                           index + hwmon_attr_base(type));
 272         }
 273
 274         hattr = devm_kzalloc(dev, sizeof(*hattr), GFP_KERNEL);
 275         if (!hattr)
 276                 return ERR_PTR(-ENOMEM);
 277
 278         hattr->type = type;
 279         hattr->attr = attr;
 280         hattr->index = index;
 281         hattr->ops = ops;
 282
 283         dattr = &hattr->dev_attr;
 284         dattr->show = is_string ? hwmon_attr_show_string : hwmon_attr_show;
 285         dattr->store = hwmon_attr_store;
 286
 287         a = &dattr->attr;
 288         sysfs_attr_init(a);
 289         a->name = name;
 290         a->mode = mode;
 291
 292         return a;
 293 }
 294
 295 /*
 296  * Chip attributes are not attribute templates but actual sysfs attributes.
 297  * See hwmon_genattr() for special handling.
 298  */
 299 static const char * const hwmon_chip_attrs[] = {
 300         [hwmon_chip_temp_reset_history] = "temp_reset_history",
 301         [hwmon_chip_in_reset_history] = "in_reset_history",
 302         [hwmon_chip_curr_reset_history] = "curr_reset_history",
 303         [hwmon_chip_power_reset_history] = "power_reset_history",
 304         [hwmon_chip_update_interval] = "update_interval",
 305         [hwmon_chip_alarms] = "alarms",
 306 };
 307
 308 static const char * const hwmon_temp_attr_templates[] = {
 309         [hwmon_temp_input] = "temp%d_input",
 310         [hwmon_temp_type] = "temp%d_type",
 311         [hwmon_temp_lcrit] = "temp%d_lcrit",
 312         [hwmon_temp_lcrit_hyst] = "temp%d_lcrit_hyst",
 313         [hwmon_temp_min] = "temp%d_min",
 314         [hwmon_temp_min_hyst] = "temp%d_min_hyst",
 315         [hwmon_temp_max] = "temp%d_max",
 316         [hwmon_temp_max_hyst] = "temp%d_max_hyst",
 317         [hwmon_temp_crit] = "temp%d_crit",
 318         [hwmon_temp_crit_hyst] = "temp%d_crit_hyst",
 319         [hwmon_temp_emergency] = "temp%d_emergency",
 320         [hwmon_temp_emergency_hyst] = "temp%d_emergency_hyst",
 321         [hwmon_temp_alarm] = "temp%d_alarm",
 322         [hwmon_temp_lcrit_alarm] = "temp%d_lcrit_alarm",
 323         [hwmon_temp_min_alarm] = "temp%d_min_alarm",
 324         [hwmon_temp_max_alarm] = "temp%d_max_alarm",
 325         [hwmon_temp_crit_alarm] = "temp%d_crit_alarm",
 326         [hwmon_temp_emergency_alarm] = "temp%d_emergency_alarm",
 327         [hwmon_temp_fault] = "temp%d_fault",
 328         [hwmon_temp_offset] = "temp%d_offset",
 329         [hwmon_temp_label] = "temp%d_label",
 330         [hwmon_temp_lowest] = "temp%d_lowest",
 331         [hwmon_temp_highest] = "temp%d_highest",
 332         [hwmon_temp_reset_history] = "temp%d_reset_history",
 333 };
 334
 335 static const char * const hwmon_in_attr_templates[] = {
 336         [hwmon_in_input] = "in%d_input",
 337         [hwmon_in_min] = "in%d_min",
 338         [hwmon_in_max] = "in%d_max",
 339         [hwmon_in_lcrit] = "in%d_lcrit",
 340         [hwmon_in_crit] = "in%d_crit",
 341         [hwmon_in_average] = "in%d_average",
 342         [hwmon_in_lowest] = "in%d_lowest",
 343         [hwmon_in_highest] = "in%d_highest",
 344         [hwmon_in_reset_history] = "in%d_reset_history",
 345         [hwmon_in_label] = "in%d_label",
 346         [hwmon_in_alarm] = "in%d_alarm",
 347         [hwmon_in_min_alarm] = "in%d_min_alarm",
 348         [hwmon_in_max_alarm] = "in%d_max_alarm",
 349         [hwmon_in_lcrit_alarm] = "in%d_lcrit_alarm",
 350         [hwmon_in_crit_alarm] = "in%d_crit_alarm",
 351 };
 352
 353 static const char * const hwmon_curr_attr_templates[] = {
 354         [hwmon_curr_input] = "curr%d_input",
 355         [hwmon_curr_min] = "curr%d_min",
 356         [hwmon_curr_max] = "curr%d_max",
 357         [hwmon_curr_lcrit] = "curr%d_lcrit",
 358         [hwmon_curr_crit] = "curr%d_crit",
 359         [hwmon_curr_average] = "curr%d_average",
 360         [hwmon_curr_lowest] = "curr%d_lowest",
 361         [hwmon_curr_highest] = "curr%d_highest",
 362         [hwmon_curr_reset_history] = "curr%d_reset_history",
 363         [hwmon_curr_label] = "curr%d_label",
 364         [hwmon_curr_alarm] = "curr%d_alarm",
 365         [hwmon_curr_min_alarm] = "curr%d_min_alarm",
 366         [hwmon_curr_max_alarm] = "curr%d_max_alarm",
 367         [hwmon_curr_lcrit_alarm] = "curr%d_lcrit_alarm",
 368         [hwmon_curr_crit_alarm] = "curr%d_crit_alarm",
 369 };
 370
 371 static const char * const hwmon_power_attr_templates[] = {
 372         [hwmon_power_average] = "power%d_average",
 373         [hwmon_power_average_interval] = "power%d_average_interval",
 374         [hwmon_power_average_interval_max] = "power%d_interval_max",
 375         [hwmon_power_average_interval_min] = "power%d_interval_min",
 376         [hwmon_power_average_highest] = "power%d_average_highest",
 377         [hwmon_power_average_lowest] = "power%d_average_lowest",
 378         [hwmon_power_average_max] = "power%d_average_max",
 379         [hwmon_power_average_min] = "power%d_average_min",
 380         [hwmon_power_input] = "power%d_input",
 381         [hwmon_power_input_highest] = "power%d_input_highest",
 382         [hwmon_power_input_lowest] = "power%d_input_lowest",
 383         [hwmon_power_reset_history] = "power%d_reset_history",
 384         [hwmon_power_accuracy] = "power%d_accuracy",
 385         [hwmon_power_cap] = "power%d_cap",
 386         [hwmon_power_cap_hyst] = "power%d_cap_hyst",
 387         [hwmon_power_cap_max] = "power%d_cap_max",
 388         [hwmon_power_cap_min] = "power%d_cap_min",
 389         [hwmon_power_max] = "power%d_max",
 390         [hwmon_power_crit] = "power%d_crit",
 391         [hwmon_power_label] = "power%d_label",
 392         [hwmon_power_alarm] = "power%d_alarm",
 393         [hwmon_power_cap_alarm] = "power%d_cap_alarm",
 394         [hwmon_power_max_alarm] = "power%d_max_alarm",
 395         [hwmon_power_crit_alarm] = "power%d_crit_alarm",
 396 };
 397
 398 static const char * const hwmon_energy_attr_templates[] = {
 399         [hwmon_energy_input] = "energy%d_input",
 400         [hwmon_energy_label] = "energy%d_label",
 401 };
 402
 403 static const char * const hwmon_humidity_attr_templates[] = {
 404         [hwmon_humidity_input] = "humidity%d_input",
 405         [hwmon_humidity_label] = "humidity%d_label",
 406         [hwmon_humidity_min] = "humidity%d_min",
 407         [hwmon_humidity_min_hyst] = "humidity%d_min_hyst",
 408         [hwmon_humidity_max] = "humidity%d_max",
 409         [hwmon_humidity_max_hyst] = "humidity%d_max_hyst",
 410         [hwmon_humidity_alarm] = "humidity%d_alarm",
 411         [hwmon_humidity_fault] = "humidity%d_fault",
 412 };
 413
 414 static const char * const hwmon_fan_attr_templates[] = {
 415         [hwmon_fan_input] = "fan%d_input",
 416         [hwmon_fan_label] = "fan%d_label",
 417         [hwmon_fan_min] = "fan%d_min",
 418         [hwmon_fan_max] = "fan%d_max",
 419         [hwmon_fan_div] = "fan%d_div",
 420         [hwmon_fan_pulses] = "fan%d_pulses",
 421         [hwmon_fan_target] = "fan%d_target",
 422         [hwmon_fan_alarm] = "fan%d_alarm",
 423         [hwmon_fan_min_alarm] = "fan%d_min_alarm",
 424         [hwmon_fan_max_alarm] = "fan%d_max_alarm",
 425         [hwmon_fan_fault] = "fan%d_fault",
 426 };
 427
 428 static const char * const hwmon_pwm_attr_templates[] = {
 429         [hwmon_pwm_input] = "pwm%d",
 430         [hwmon_pwm_enable] = "pwm%d_enable",
 431         [hwmon_pwm_mode] = "pwm%d_mode",
 432         [hwmon_pwm_freq] = "pwm%d_freq",
 433 };
 434
 435 static const char * const *__templates[] = {
 436         [hwmon_chip] = hwmon_chip_attrs,
 437         [hwmon_temp] = hwmon_temp_attr_templates,
 438         [hwmon_in] = hwmon_in_attr_templates,
 439         [hwmon_curr] = hwmon_curr_attr_templates,
 440         [hwmon_power] = hwmon_power_attr_templates,
 441         [hwmon_energy] = hwmon_energy_attr_templates,
 442         [hwmon_humidity] = hwmon_humidity_attr_templates,
 443         [hwmon_fan] = hwmon_fan_attr_templates,
 444         [hwmon_pwm] = hwmon_pwm_attr_templates,
 445 };
 446
 447 static const int __templates_size[] = {
 448         [hwmon_chip] = ARRAY_SIZE(hwmon_chip_attrs),
 449         [hwmon_temp] = ARRAY_SIZE(hwmon_temp_attr_templates),
 450         [hwmon_in] = ARRAY_SIZE(hwmon_in_attr_templates),
 451         [hwmon_curr] = ARRAY_SIZE(hwmon_curr_attr_templates),
 452         [hwmon_power] = ARRAY_SIZE(hwmon_power_attr_templates),
 453         [hwmon_energy] = ARRAY_SIZE(hwmon_energy_attr_templates),
 454         [hwmon_humidity] = ARRAY_SIZE(hwmon_humidity_attr_templates),
 455         [hwmon_fan] = ARRAY_SIZE(hwmon_fan_attr_templates),
 456         [hwmon_pwm] = ARRAY_SIZE(hwmon_pwm_attr_templates),
 457 };
 458
 459 static int hwmon_num_channel_attrs(const struct hwmon_channel_info *info)
 460 {
 461         int i, n;
 462
 463         for (i = n = 0; info->config[i]; i++)
 464                 n += hweight32(info->config[i]);
 465
 466         return n;
 467 }
 468
 469 static int hwmon_genattrs(struct device *dev,
 470                           const void *drvdata,
 471                           struct attribute **attrs,
 472                           const struct hwmon_ops *ops,
 473                           const struct hwmon_channel_info *info)
 474 {
 475         const char * const *templates;
 476         int template_size;
 477         int i, aindex = 0;
 478
 479         if (info->type >= ARRAY_SIZE(__templates))
 480                 return -EINVAL;
 481
 482         templates = __templates[info->type];
 483         template_size = __templates_size[info->type];
 484
 485         for (i = 0; info->config[i]; i++) {
 486                 u32 attr_mask = info->config[i];
 487                 u32 attr;
 488
 489                 while (attr_mask) {
 490                         struct attribute *a;
 491
 492                         attr = __ffs(attr_mask);
 493                         attr_mask &= ~BIT(attr);
 494                         if (attr >= template_size)
 495                                 return -EINVAL;
 496                         a = hwmon_genattr(dev, drvdata, info->type, attr, i,
 497                                           templates[attr], ops);
 498                         if (IS_ERR(a)) {
 499                                 if (PTR_ERR(a) != -ENOENT)
 500                                         return PTR_ERR(a);
 501                                 continue;
 502                         }
 503                         attrs[aindex++] = a;
 504                 }
 505         }
 506         return aindex;
 507 }
 508
 509 static struct attribute **
 510 __hwmon_create_attrs(struct device *dev, const void *drvdata,
 511                      const struct hwmon_chip_info *chip)
 512 {
 513         int ret, i, aindex = 0, nattrs = 0;
 514         struct attribute **attrs;
 515
 516         for (i = 0; chip->info[i]; i++)
 517                 nattrs += hwmon_num_channel_attrs(chip->info[i]);
 518
 519         if (nattrs == 0)
 520                 return ERR_PTR(-EINVAL);
 521
 522         attrs = devm_kcalloc(dev, nattrs + 1, sizeof(*attrs), GFP_KERNEL);
 523         if (!attrs)
 524                 return ERR_PTR(-ENOMEM);
 525
 526         for (i = 0; chip->info[i]; i++) {
 527                 ret = hwmon_genattrs(dev, drvdata, &attrs[aindex], chip->ops,
 528                                      chip->info[i]);
 529                 if (ret < 0)
 530                         return ERR_PTR(ret);
 531                 aindex += ret;
 532         }
 533
 534         return attrs;
 535 }
 536
 537 static struct device *
 538 __hwmon_device_register(struct device *dev, const char *name, void *drvdata,
 539                         const struct hwmon_chip_info *chip,
 540                         const struct attribute_group **groups)
 541 {
 542         struct hwmon_device *hwdev;
 543         struct device *hdev;
 544         int i, j, err, id;
 545
 546         /* Do not accept invalid characters in hwmon name attribute */
 547         if (name && (!strlen(name) || strpbrk(name, "-* \t\n")))
 548                 return ERR_PTR(-EINVAL);
 549
 550         id = ida_simple_get(&hwmon_ida, 0, 0, GFP_KERNEL);
 551         if (id < 0)
 552                 return ERR_PTR(id);
 553
 554         hwdev = kzalloc(sizeof(*hwdev), GFP_KERNEL);
 555         if (hwdev == NULL) {
 556                 err = -ENOMEM;
 557                 goto ida_remove;
 558         }
 559
 560         hdev = &hwdev->dev;
 561
 562         if (chip) {
 563                 struct attribute **attrs;
 564                 int ngroups = 2;
 565
 566                 if (groups)
 567                         for (i = 0; groups[i]; i++)
 568                                 ngroups++;
 569
 570                 hwdev->groups = devm_kcalloc(dev, ngroups, sizeof(*groups),
 571                                              GFP_KERNEL);
 572                 if (!hwdev->groups) {
 573                         err = -ENOMEM;
 574                         goto free_hwmon;
 575                 }
 576
 577                 attrs = __hwmon_create_attrs(dev, drvdata, chip);
 578                 if (IS_ERR(attrs)) {
 579                         err = PTR_ERR(attrs);
 580                         goto free_hwmon;
 581                 }
 582
 583                 hwdev->group.attrs = attrs;
 584                 ngroups = 0;
 585                 hwdev->groups[ngroups++] = &hwdev->group;
 586
 587                 if (groups) {
 588                         for (i = 0; groups[i]; i++)
 589                                 hwdev->groups[ngroups++] = groups[i];
 590                 }
 591
 592                 hdev->groups = hwdev->groups;
 593         } else {
 594                 hdev->groups = groups;
 595         }
 596
 597         hwdev->name = name;
 598         hdev->class = &hwmon_class;
 599         hdev->parent = dev;
 600         hdev->of_node = dev ? dev->of_node : NULL;
 601         hwdev->chip = chip;
 602         dev_set_drvdata(hdev, drvdata);
 603         dev_set_name(hdev, HWMON_ID_FORMAT, id);
 604         err = device_register(hdev);
 605         if (err)
 606                 goto free_hwmon;
 607
 608         if (chip && chip->ops->read &&
 609             chip->info[0]->type == hwmon_chip &&
 610             (chip->info[0]->config[0] & HWMON_C_REGISTER_TZ)) {
 611                 const struct hwmon_channel_info **info = chip->info;
 612
 613                 for (i = 1; info[i]; i++) {
 614                         if (info[i]->type != hwmon_temp)
 615                                 continue;
 616
 617                         for (j = 0; info[i]->config[j]; j++) {
 618                                 if (!chip->ops->is_visible(drvdata, hwmon_temp,
 619                                                            hwmon_temp_input, j))
 620                                         continue;
 621                                 if (info[i]->config[j] & HWMON_T_INPUT)
 622                                         hwmon_thermal_add_sensor(dev, hwdev, j);
 623                         }
 624                 }
 625         }
 626
 627         return hdev;
 628
 629 free_hwmon:
 630         kfree(hwdev);
 631 ida_remove:
 632         ida_simple_remove(&hwmon_ida, id);
 633         return ERR_PTR(err);
 634 }
 635
 636 /**
 637  * hwmon_device_register_with_groups - register w/ hwmon
 638  * @dev: the parent device
 639  * @name: hwmon name attribute
 640  * @drvdata: driver data to attach to created device
 641  * @groups: List of attribute groups to create
 642  *
 643  * hwmon_device_unregister() must be called when the device is no
 644  * longer needed.
 645  *
 646  * Returns the pointer to the new device.
 647  */
 648 struct device *
 649 hwmon_device_register_with_groups(struct device *dev, const char *name,
 650                                   void *drvdata,
 651                                   const struct attribute_group **groups)
 652 {
 653         return __hwmon_device_register(dev, name, drvdata, NULL, groups);
 654 }
 655 EXPORT_SYMBOL_GPL(hwmon_device_register_with_groups);
 656
 657 /**
 658  * hwmon_device_register_with_info - register w/ hwmon
 659  * @dev: the parent device
 660  * @name: hwmon name attribute
 661  * @drvdata: driver data to attach to created device
 662  * @info: Pointer to hwmon chip information
 663  * @groups - pointer to list of driver specific attribute groups
 664  *
 665  * hwmon_device_unregister() must be called when the device is no
 666  * longer needed.
 667  *
 668  * Returns the pointer to the new device.
 669  */
 670 struct device *
 671 hwmon_device_register_with_info(struct device *dev, const char *name,
 672                                 void *drvdata,
 673                                 const struct hwmon_chip_info *chip,
 674                                 const struct attribute_group **groups)
 675 {
 676         if (chip && (!chip->ops || !chip->ops->is_visible || !chip->info))
 677                 return ERR_PTR(-EINVAL);
 678
 679         return __hwmon_device_register(dev, name, drvdata, chip, groups);
 680 }
 681 EXPORT_SYMBOL_GPL(hwmon_device_register_with_info);
 682
 683 /**
 684  * hwmon_device_register - register w/ hwmon
 685  * @dev: the device to register
 686  *
 687  * hwmon_device_unregister() must be called when the device is no
 688  * longer needed.
 689  *
 690  * Returns the pointer to the new device.
 691  */
 692 struct device *hwmon_device_register(struct device *dev)
 693 {
 694         dev_warn(dev,
 695                  "hwmon_device_register() is deprecated. Please convert the driver to use hwmon_device_register_with_info().\n");
 696
 697         return hwmon_device_register_with_groups(dev, NULL, NULL, NULL);
 698 }
 699 EXPORT_SYMBOL_GPL(hwmon_device_register);
 700
 701 /**
 702  * hwmon_device_unregister - removes the previously registered class device
 703  *
 704  * @dev: the class device to destroy
 705  */
 706 void hwmon_device_unregister(struct device *dev)
 707 {
 708         int id;
 709
 710         if (likely(sscanf(dev_name(dev), HWMON_ID_FORMAT, &id) == 1)) {
 711                 device_unregister(dev);
 712                 ida_simple_remove(&hwmon_ida, id);
 713         } else
 714                 dev_dbg(dev->parent,
 715                         "hwmon_device_unregister() failed: bad class ID!\n");
 716 }
 717 EXPORT_SYMBOL_GPL(hwmon_device_unregister);
 718
 719 static void devm_hwmon_release(struct device *dev, void *res)
 720 {
 721         struct device *hwdev = *(struct device **)res;
 722
 723         hwmon_device_unregister(hwdev);
 724 }
 725
 726 /**
 727  * devm_hwmon_device_register_with_groups - register w/ hwmon
 728  * @dev: the parent device
 729  * @name: hwmon name attribute
 730  * @drvdata: driver data to attach to created device
 731  * @groups: List of attribute groups to create
 732  *
 733  * Returns the pointer to the new device. The new device is automatically
 734  * unregistered with the parent device.
 735  */
 736 struct device *
 737 devm_hwmon_device_register_with_groups(struct device *dev, const char *name,
 738                                        void *drvdata,
 739                                        const struct attribute_group **groups)
 740 {
 741         struct device **ptr, *hwdev;
 742
 743         if (!dev)
 744                 return ERR_PTR(-EINVAL);
 745
 746         ptr = devres_alloc(devm_hwmon_release, sizeof(*ptr), GFP_KERNEL);
 747         if (!ptr)
 748                 return ERR_PTR(-ENOMEM);
 749
 750         hwdev = hwmon_device_register_with_groups(dev, name, drvdata, groups);
 751         if (IS_ERR(hwdev))
 752                 goto error;
 753
 754         *ptr = hwdev;
 755         devres_add(dev, ptr);
 756         return hwdev;
 757
 758 error:
 759         devres_free(ptr);
 760         return hwdev;
 761 }
 762 EXPORT_SYMBOL_GPL(devm_hwmon_device_register_with_groups);
 763
 764 /**
 765  * devm_hwmon_device_register_with_info - register w/ hwmon
 766  * @dev: the parent device
 767  * @name: hwmon name attribute
 768  * @drvdata: driver data to attach to created device
 769  * @info: Pointer to hwmon chip information
 770  * @groups - pointer to list of driver specific attribute groups
 771  *
 772  * Returns the pointer to the new device. The new device is automatically
 773  * unregistered with the parent device.
 774  */
 775 struct device *
 776 devm_hwmon_device_register_with_info(struct device *dev, const char *name,
 777                                      void *drvdata,
 778                                      const struct hwmon_chip_info *chip,
 779                                      const struct attribute_group **groups)
 780 {
 781         struct device **ptr, *hwdev;
 782
 783         if (!dev)
 784                 return ERR_PTR(-EINVAL);
 785
 786         ptr = devres_alloc(devm_hwmon_release, sizeof(*ptr), GFP_KERNEL);
 787         if (!ptr)
 788                 return ERR_PTR(-ENOMEM);
 789
 790         hwdev = hwmon_device_register_with_info(dev, name, drvdata, chip,
 791                                                 groups);
 792         if (IS_ERR(hwdev))
 793                 goto error;
 794
 795         *ptr = hwdev;
 796         devres_add(dev, ptr);
 797
 798         return hwdev;
 799
 800 error:
 801         devres_free(ptr);
 802         return hwdev;
 803 }
 804 EXPORT_SYMBOL_GPL(devm_hwmon_device_register_with_info);
 805
 806 static int devm_hwmon_match(struct device *dev, void *res, void *data)
 807 {
 808         struct device **hwdev = res;
 809
 810         return *hwdev == data;
 811 }
 812
 813 /**
 814  * devm_hwmon_device_unregister - removes a previously registered hwmon device
 815  *
 816  * @dev: the parent device of the device to unregister
 817  */
 818 void devm_hwmon_device_unregister(struct device *dev)
 819 {
 820         WARN_ON(devres_release(dev, devm_hwmon_release, devm_hwmon_match, dev));
 821 }
 822 EXPORT_SYMBOL_GPL(devm_hwmon_device_unregister);
 823
 824 static void __init hwmon_pci_quirks(void)
 825 {
 826 #if defined CONFIG_X86 && defined CONFIG_PCI
 827         struct pci_dev *sb;
 828         u16 base;
 829         u8 enable;
 830
 831         /* Open access to 0x295-0x296 on MSI MS-7031 */
 832         sb = pci_get_device(PCI_VENDOR_ID_ATI, 0x436c, NULL);
 833         if (sb) {
 834                 if (sb->subsystem_vendor == 0x1462 &&   /* MSI */
 835                     sb->subsystem_device == 0x0031) {   /* MS-7031 */
 836                         pci_read_config_byte(sb, 0x48, &enable);
 837                         pci_read_config_word(sb, 0x64, &base);
 838
 839                         if (base == 0 && !(enable & BIT(2))) {
 840                                 dev_info(&sb->dev,
 841                                          "Opening wide generic port at 0x295\n");
 842                                 pci_write_config_word(sb, 0x64, 0x295);
 843                                 pci_write_config_byte(sb, 0x48,
 844                                                       enable | BIT(2));
 845                         }
 846                 }
 847                 pci_dev_put(sb);
 848         }
 849 #endif
 850 }
 851
 852 static int __init hwmon_init(void)
 853 {
 854         int err;
 855
 856         hwmon_pci_quirks();
 857
 858         err = class_register(&hwmon_class);
 859         if (err) {
 860                 pr_err("couldn't register hwmon sysfs class\n");
 861                 return err;
 862         }
 863         return 0;
 864 }
 865
 866 static void __exit hwmon_exit(void)
 867 {
 868         class_unregister(&hwmon_class);
 869 }
 870
 871 subsys_initcall(hwmon_init);
 872 module_exit(hwmon_exit);
 873
 874 MODULE_AUTHOR("Mark M. Hoffman <mhoffman@lightlink.com>");
 875 MODULE_DESCRIPTION("hardware monitoring sysfs/class support");
 876 MODULE_LICENSE("GPL");
 877