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