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 *__templates[] = {
 376         [hwmon_chip] = hwmon_chip_attr_templates,
 377         [hwmon_temp] = hwmon_temp_attr_templates,
 378         [hwmon_in] = hwmon_in_attr_templates,
 379         [hwmon_curr] = hwmon_curr_attr_templates,
 380         [hwmon_power] = hwmon_power_attr_templates,
 381         [hwmon_energy] = hwmon_energy_attr_templates,
 382         [hwmon_humidity] = hwmon_humidity_attr_templates,
 383 };
 384
 385 static const int __templates_size[] = {
 386         [hwmon_chip] = ARRAY_SIZE(hwmon_chip_attr_templates),
 387         [hwmon_temp] = ARRAY_SIZE(hwmon_temp_attr_templates),
 388         [hwmon_in] = ARRAY_SIZE(hwmon_in_attr_templates),
 389         [hwmon_curr] = ARRAY_SIZE(hwmon_curr_attr_templates),
 390         [hwmon_power] = ARRAY_SIZE(hwmon_power_attr_templates),
 391         [hwmon_energy] = ARRAY_SIZE(hwmon_energy_attr_templates),
 392         [hwmon_humidity] = ARRAY_SIZE(hwmon_humidity_attr_templates),
 393 };
 394
 395 static int hwmon_num_channel_attrs(const struct hwmon_channel_info *info)
 396 {
 397         int i, n;
 398
 399         for (i = n = 0; info->config[i]; i++)
 400                 n += hweight32(info->config[i]);
 401
 402         return n;
 403 }
 404
 405 static int hwmon_genattrs(struct device *dev,
 406                           const void *drvdata,
 407                           struct attribute **attrs,
 408                           const struct hwmon_ops *ops,
 409                           const struct hwmon_channel_info *info)
 410 {
 411         const char * const *templates;
 412         int template_size;
 413         int i, aindex = 0;
 414
 415         if (info->type >= ARRAY_SIZE(__templates))
 416                 return -EINVAL;
 417
 418         templates = __templates[info->type];
 419         template_size = __templates_size[info->type];
 420
 421         for (i = 0; info->config[i]; i++) {
 422                 u32 attr_mask = info->config[i];
 423                 u32 attr;
 424
 425                 while (attr_mask) {
 426                         struct attribute *a;
 427
 428                         attr = __ffs(attr_mask);
 429                         attr_mask &= ~BIT(attr);
 430                         if (attr >= template_size)
 431                                 return -EINVAL;
 432                         a = hwmon_genattr(dev, drvdata, info->type, attr, i,
 433                                           templates[attr], ops);
 434                         if (IS_ERR(a)) {
 435                                 if (PTR_ERR(a) != -ENOENT)
 436                                         return PTR_ERR(a);
 437                                 continue;
 438                         }
 439                         attrs[aindex++] = a;
 440                 }
 441         }
 442         return aindex;
 443 }
 444
 445 static struct attribute **
 446 __hwmon_create_attrs(struct device *dev, const void *drvdata,
 447                      const struct hwmon_chip_info *chip)
 448 {
 449         int ret, i, aindex = 0, nattrs = 0;
 450         struct attribute **attrs;
 451
 452         for (i = 0; chip->info[i]; i++)
 453                 nattrs += hwmon_num_channel_attrs(chip->info[i]);
 454
 455         if (nattrs == 0)
 456                 return ERR_PTR(-EINVAL);
 457
 458         attrs = devm_kcalloc(dev, nattrs + 1, sizeof(*attrs), GFP_KERNEL);
 459         if (!attrs)
 460                 return ERR_PTR(-ENOMEM);
 461
 462         for (i = 0; chip->info[i]; i++) {
 463                 ret = hwmon_genattrs(dev, drvdata, &attrs[aindex], chip->ops,
 464                                      chip->info[i]);
 465                 if (ret < 0)
 466                         return ERR_PTR(ret);
 467                 aindex += ret;
 468         }
 469
 470         return attrs;
 471 }
 472
 473 static struct device *
 474 __hwmon_device_register(struct device *dev, const char *name, void *drvdata,
 475                         const struct hwmon_chip_info *chip,
 476                         const struct attribute_group **groups)
 477 {
 478         struct hwmon_device *hwdev;
 479         struct device *hdev;
 480         int i, j, err, id;
 481
 482         /* Do not accept invalid characters in hwmon name attribute */
 483         if (name && (!strlen(name) || strpbrk(name, "-* \t\n")))
 484                 return ERR_PTR(-EINVAL);
 485
 486         id = ida_simple_get(&hwmon_ida, 0, 0, GFP_KERNEL);
 487         if (id < 0)
 488                 return ERR_PTR(id);
 489
 490         hwdev = kzalloc(sizeof(*hwdev), GFP_KERNEL);
 491         if (hwdev == NULL) {
 492                 err = -ENOMEM;
 493                 goto ida_remove;
 494         }
 495
 496         hdev = &hwdev->dev;
 497
 498         if (chip && chip->ops->is_visible) {
 499                 struct attribute **attrs;
 500                 int ngroups = 2;
 501
 502                 if (groups)
 503                         for (i = 0; groups[i]; i++)
 504                                 ngroups++;
 505
 506                 hwdev->groups = devm_kcalloc(dev, ngroups, sizeof(*groups),
 507                                              GFP_KERNEL);
 508                 if (!hwdev->groups)
 509                         return ERR_PTR(-ENOMEM);
 510
 511                 attrs = __hwmon_create_attrs(dev, drvdata, chip);
 512                 if (IS_ERR(attrs)) {
 513                         err = PTR_ERR(attrs);
 514                         goto free_hwmon;
 515                 }
 516
 517                 hwdev->group.attrs = attrs;
 518                 ngroups = 0;
 519                 hwdev->groups[ngroups++] = &hwdev->group;
 520
 521                 if (groups) {
 522                         for (i = 0; groups[i]; i++)
 523                                 hwdev->groups[ngroups++] = groups[i];
 524                 }
 525
 526                 hdev->groups = hwdev->groups;
 527         } else {
 528                 hdev->groups = groups;
 529         }
 530
 531         hwdev->name = name;
 532         hdev->class = &hwmon_class;
 533         hdev->parent = dev;
 534         hdev->of_node = dev ? dev->of_node : NULL;
 535         hwdev->chip = chip;
 536         dev_set_drvdata(hdev, drvdata);
 537         dev_set_name(hdev, HWMON_ID_FORMAT, id);
 538         err = device_register(hdev);
 539         if (err)
 540                 goto free_hwmon;
 541
 542         if (chip && chip->ops->is_visible && chip->ops->read &&
 543             chip->info[0]->type == hwmon_chip &&
 544             (chip->info[0]->config[0] & HWMON_C_REGISTER_TZ)) {
 545                 const struct hwmon_channel_info **info = chip->info;
 546
 547                 for (i = 1; info[i]; i++) {
 548                         if (info[i]->type != hwmon_temp)
 549                                 continue;
 550
 551                         for (j = 0; info[i]->config[j]; j++) {
 552                                 if (!chip->ops->is_visible(drvdata, hwmon_temp,
 553                                                            hwmon_temp_input, j))
 554                                         continue;
 555                                 if (info[i]->config[j] & HWMON_T_INPUT)
 556                                         hwmon_thermal_add_sensor(dev, hwdev, j);
 557                         }
 558                 }
 559         }
 560
 561         return hdev;
 562
 563 free_hwmon:
 564         kfree(hwdev);
 565 ida_remove:
 566         ida_simple_remove(&hwmon_ida, id);
 567         return ERR_PTR(err);
 568 }
 569
 570 /**
 571  * hwmon_device_register_with_groups - register w/ hwmon
 572  * @dev: the parent device
 573  * @name: hwmon name attribute
 574  * @drvdata: driver data to attach to created device
 575  * @groups: List of attribute groups to create
 576  *
 577  * hwmon_device_unregister() must be called when the device is no
 578  * longer needed.
 579  *
 580  * Returns the pointer to the new device.
 581  */
 582 struct device *
 583 hwmon_device_register_with_groups(struct device *dev, const char *name,
 584                                   void *drvdata,
 585                                   const struct attribute_group **groups)
 586 {
 587         return __hwmon_device_register(dev, name, drvdata, NULL, groups);
 588 }
 589 EXPORT_SYMBOL_GPL(hwmon_device_register_with_groups);
 590
 591 /**
 592  * hwmon_device_register_with_info - register w/ hwmon
 593  * @dev: the parent device
 594  * @name: hwmon name attribute
 595  * @drvdata: driver data to attach to created device
 596  * @info: Pointer to hwmon chip information
 597  * @groups - pointer to list of driver specific attribute groups
 598  *
 599  * hwmon_device_unregister() must be called when the device is no
 600  * longer needed.
 601  *
 602  * Returns the pointer to the new device.
 603  */
 604 struct device *
 605 hwmon_device_register_with_info(struct device *dev, const char *name,
 606                                 void *drvdata,
 607                                 const struct hwmon_chip_info *chip,
 608                                 const struct attribute_group **groups)
 609 {
 610         if (chip && (!chip->ops || !chip->info))
 611                 return ERR_PTR(-EINVAL);
 612
 613         return __hwmon_device_register(dev, name, drvdata, chip, groups);
 614 }
 615 EXPORT_SYMBOL_GPL(hwmon_device_register_with_info);
 616
 617 /**
 618  * hwmon_device_register - register w/ hwmon
 619  * @dev: the device to register
 620  *
 621  * hwmon_device_unregister() must be called when the device is no
 622  * longer needed.
 623  *
 624  * Returns the pointer to the new device.
 625  */
 626 struct device *hwmon_device_register(struct device *dev)
 627 {
 628         return hwmon_device_register_with_groups(dev, NULL, NULL, NULL);
 629 }
 630 EXPORT_SYMBOL_GPL(hwmon_device_register);
 631
 632 /**
 633  * hwmon_device_unregister - removes the previously registered class device
 634  *
 635  * @dev: the class device to destroy
 636  */
 637 void hwmon_device_unregister(struct device *dev)
 638 {
 639         int id;
 640
 641         if (likely(sscanf(dev_name(dev), HWMON_ID_FORMAT, &id) == 1)) {
 642                 device_unregister(dev);
 643                 ida_simple_remove(&hwmon_ida, id);
 644         } else
 645                 dev_dbg(dev->parent,
 646                         "hwmon_device_unregister() failed: bad class ID!\n");
 647 }
 648 EXPORT_SYMBOL_GPL(hwmon_device_unregister);
 649
 650 static void devm_hwmon_release(struct device *dev, void *res)
 651 {
 652         struct device *hwdev = *(struct device **)res;
 653
 654         hwmon_device_unregister(hwdev);
 655 }
 656
 657 /**
 658  * devm_hwmon_device_register_with_groups - register w/ hwmon
 659  * @dev: the parent device
 660  * @name: hwmon name attribute
 661  * @drvdata: driver data to attach to created device
 662  * @groups: List of attribute groups to create
 663  *
 664  * Returns the pointer to the new device. The new device is automatically
 665  * unregistered with the parent device.
 666  */
 667 struct device *
 668 devm_hwmon_device_register_with_groups(struct device *dev, const char *name,
 669                                        void *drvdata,
 670                                        const struct attribute_group **groups)
 671 {
 672         struct device **ptr, *hwdev;
 673
 674         if (!dev)
 675                 return ERR_PTR(-EINVAL);
 676
 677         ptr = devres_alloc(devm_hwmon_release, sizeof(*ptr), GFP_KERNEL);
 678         if (!ptr)
 679                 return ERR_PTR(-ENOMEM);
 680
 681         hwdev = hwmon_device_register_with_groups(dev, name, drvdata, groups);
 682         if (IS_ERR(hwdev))
 683                 goto error;
 684
 685         *ptr = hwdev;
 686         devres_add(dev, ptr);
 687         return hwdev;
 688
 689 error:
 690         devres_free(ptr);
 691         return hwdev;
 692 }
 693 EXPORT_SYMBOL_GPL(devm_hwmon_device_register_with_groups);
 694
 695 /**
 696  * devm_hwmon_device_register_with_info - register w/ hwmon
 697  * @dev: the parent device
 698  * @name: hwmon name attribute
 699  * @drvdata: driver data to attach to created device
 700  * @info: Pointer to hwmon chip information
 701  * @groups - pointer to list of driver specific attribute groups
 702  *
 703  * Returns the pointer to the new device. The new device is automatically
 704  * unregistered with the parent device.
 705  */
 706 struct device *
 707 devm_hwmon_device_register_with_info(struct device *dev, const char *name,
 708                                      void *drvdata,
 709                                      const struct hwmon_chip_info *chip,
 710                                      const struct attribute_group **groups)
 711 {
 712         struct device **ptr, *hwdev;
 713
 714         if (!dev)
 715                 return ERR_PTR(-EINVAL);
 716
 717         ptr = devres_alloc(devm_hwmon_release, sizeof(*ptr), GFP_KERNEL);
 718         if (!ptr)
 719                 return ERR_PTR(-ENOMEM);
 720
 721         hwdev = hwmon_device_register_with_info(dev, name, drvdata, chip,
 722                                                 groups);
 723         if (IS_ERR(hwdev))
 724                 goto error;
 725
 726         *ptr = hwdev;
 727         devres_add(dev, ptr);
 728
 729         return hwdev;
 730
 731 error:
 732         devres_free(ptr);
 733         return hwdev;
 734 }
 735 EXPORT_SYMBOL_GPL(devm_hwmon_device_register_with_info);
 736
 737 static int devm_hwmon_match(struct device *dev, void *res, void *data)
 738 {
 739         struct device **hwdev = res;
 740
 741         return *hwdev == data;
 742 }
 743
 744 /**
 745  * devm_hwmon_device_unregister - removes a previously registered hwmon device
 746  *
 747  * @dev: the parent device of the device to unregister
 748  */
 749 void devm_hwmon_device_unregister(struct device *dev)
 750 {
 751         WARN_ON(devres_release(dev, devm_hwmon_release, devm_hwmon_match, dev));
 752 }
 753 EXPORT_SYMBOL_GPL(devm_hwmon_device_unregister);
 754
 755 static void __init hwmon_pci_quirks(void)
 756 {
 757 #if defined CONFIG_X86 && defined CONFIG_PCI
 758         struct pci_dev *sb;
 759         u16 base;
 760         u8 enable;
 761
 762         /* Open access to 0x295-0x296 on MSI MS-7031 */
 763         sb = pci_get_device(PCI_VENDOR_ID_ATI, 0x436c, NULL);
 764         if (sb) {
 765                 if (sb->subsystem_vendor == 0x1462 &&   /* MSI */
 766                     sb->subsystem_device == 0x0031) {   /* MS-7031 */
 767                         pci_read_config_byte(sb, 0x48, &enable);
 768                         pci_read_config_word(sb, 0x64, &base);
 769
 770                         if (base == 0 && !(enable & BIT(2))) {
 771                                 dev_info(&sb->dev,
 772                                          "Opening wide generic port at 0x295\n");
 773                                 pci_write_config_word(sb, 0x64, 0x295);
 774                                 pci_write_config_byte(sb, 0x48,
 775                                                       enable | BIT(2));
 776                         }
 777                 }
 778                 pci_dev_put(sb);
 779         }
 780 #endif
 781 }
 782
 783 static int __init hwmon_init(void)
 784 {
 785         int err;
 786
 787         hwmon_pci_quirks();
 788
 789         err = class_register(&hwmon_class);
 790         if (err) {
 791                 pr_err("couldn't register hwmon sysfs class\n");
 792                 return err;
 793         }
 794         return 0;
 795 }
 796
 797 static void __exit hwmon_exit(void)
 798 {
 799         class_unregister(&hwmon_class);
 800 }
 801
 802 subsys_initcall(hwmon_init);
 803 module_exit(hwmon_exit);
 804
 805 MODULE_AUTHOR("Mark M. Hoffman <mhoffman@lightlink.com>");
 806 MODULE_DESCRIPTION("hardware monitoring sysfs/class support");
 807 MODULE_LICENSE("GPL");
 808