drivers/hwmon/hwmon.c

   1 /*
   2  * hwmon.c - part of lm_sensors, Linux kernel modules for hardware monitoring
   3  *
   4  * This file defines the sysfs class "hwmon", for use by sensors drivers.
   5  *
   6  * Copyright (C) 2005 Mark M. Hoffman <mhoffman@lightlink.com>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; version 2 of the License.
  11  */
  12
  13 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  14
  15 #include <linux/bitops.h>
  16 #include <linux/device.h>
  17 #include <linux/err.h>
  18 #include <linux/gfp.h>
  19 #include <linux/hwmon.h>
  20 #include <linux/idr.h>
  21 #include <linux/module.h>
  22 #include <linux/pci.h>
  23 #include <linux/slab.h>
  24 #include <linux/string.h>
  25 #include <linux/thermal.h>
  26
  27 #define HWMON_ID_PREFIX "hwmon"
  28 #define HWMON_ID_FORMAT HWMON_ID_PREFIX "%d"
  29
  30 struct hwmon_device {
  31         const char *name;
  32         struct device dev;
  33         const struct hwmon_chip_info *chip;
  34
  35         struct attribute_group group;
  36         const struct attribute_group **groups;
  37 };
  38
  39 #define to_hwmon_device(d) container_of(d, struct hwmon_device, dev)
  40
  41 #define MAX_SYSFS_ATTR_NAME_LENGTH      32
  42
  43 struct hwmon_device_attribute {
  44         struct device_attribute dev_attr;
  45         const struct hwmon_ops *ops;
  46         enum hwmon_sensor_types type;
  47         u32 attr;
  48         int index;
  49         char name[MAX_SYSFS_ATTR_NAME_LENGTH];
  50 };
  51
  52 #define to_hwmon_attr(d) \
  53         container_of(d, struct hwmon_device_attribute, dev_attr)
  54 #define to_dev_attr(a) container_of(a, struct device_attribute, attr)
  55
  56 /*
  57  * Thermal zone information
  58  * In addition to the reference to the hwmon device,
  59  * also provides the sensor index.
  60  */
  61 struct hwmon_thermal_data {
  62         struct device *dev;             /* Reference to hwmon device */
  63         int index;                      /* sensor index */
  64 };
  65
  66 static ssize_t
  67 show_name(struct device *dev, struct device_attribute *attr, char *buf)
  68 {
  69         return sprintf(buf, "%s\n", to_hwmon_device(dev)->name);
  70 }
  71 static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);
  72
  73 static struct attribute *hwmon_dev_attrs[] = {
  74         &dev_attr_name.attr,
  75         NULL
  76 };
  77
  78 static umode_t hwmon_dev_name_is_visible(struct kobject *kobj,
  79                                          struct attribute *attr, int n)
  80 {
  81         struct device *dev = container_of(kobj, struct device, kobj);
  82
  83         if (to_hwmon_device(dev)->name == NULL)
  84                 return 0;
  85
  86         return attr->mode;
  87 }
  88
  89 static struct attribute_group hwmon_dev_attr_group = {
  90         .attrs          = hwmon_dev_attrs,
  91         .is_visible     = hwmon_dev_name_is_visible,
  92 };
  93
  94 static const struct attribute_group *hwmon_dev_attr_groups[] = {
  95         &hwmon_dev_attr_group,
  96         NULL
  97 };
  98
  99 static void hwmon_free_attrs(struct attribute **attrs)
 100 {
 101         int i;
 102
 103         for (i = 0; attrs[i]; i++) {
 104                 struct device_attribute *dattr = to_dev_attr(attrs[i]);
 105                 struct hwmon_device_attribute *hattr = to_hwmon_attr(dattr);
 106
 107                 kfree(hattr);
 108         }
 109         kfree(attrs);
 110 }
 111
 112 static void hwmon_dev_release(struct device *dev)
 113 {
 114         struct hwmon_device *hwdev = to_hwmon_device(dev);
 115
 116         if (hwdev->group.attrs)
 117                 hwmon_free_attrs(hwdev->group.attrs);
 118         kfree(hwdev->groups);
 119         kfree(hwdev);
 120 }
 121
 122 static struct class hwmon_class = {
 123         .name = "hwmon",
 124         .owner = THIS_MODULE,
 125         .dev_groups = hwmon_dev_attr_groups,
 126         .dev_release = hwmon_dev_release,
 127 };
 128
 129 static DEFINE_IDA(hwmon_ida);
 130
 131 /* Thermal zone handling */
 132
 133 /*
 134  * The complex conditional is necessary to avoid a cyclic dependency
 135  * between hwmon and thermal_sys modules.
 136  */
 137 #if IS_REACHABLE(CONFIG_THERMAL) && defined(CONFIG_THERMAL_OF) && \
 138         (!defined(CONFIG_THERMAL_HWMON) || \
 139          !(defined(MODULE) && IS_MODULE(CONFIG_THERMAL)))
 140 static int hwmon_thermal_get_temp(void *data, int *temp)
 141 {
 142         struct hwmon_thermal_data *tdata = data;
 143         struct hwmon_device *hwdev = to_hwmon_device(tdata->dev);
 144         int ret;
 145         long t;
 146
 147         ret = hwdev->chip->ops->read(tdata->dev, hwmon_temp, hwmon_temp_input,
 148                                      tdata->index, &t);
 149         if (ret < 0)
 150                 return ret;
 151
 152         *temp = t;
 153
 154         return 0;
 155 }
 156
 157 static struct thermal_zone_of_device_ops hwmon_thermal_ops = {
 158         .get_temp = hwmon_thermal_get_temp,
 159 };
 160
 161 static int hwmon_thermal_add_sensor(struct device *dev, int index)
 162 {
 163         struct hwmon_thermal_data *tdata;
 164         struct thermal_zone_device *tzd;
 165
 166         tdata = devm_kzalloc(dev, sizeof(*tdata), GFP_KERNEL);
 167         if (!tdata)
 168                 return -ENOMEM;
 169
 170         tdata->dev = dev;
 171         tdata->index = index;
 172
 173         tzd = devm_thermal_zone_of_sensor_register(dev, index, tdata,
 174                                                    &hwmon_thermal_ops);
 175         /*
 176          * If CONFIG_THERMAL_OF is disabled, this returns -ENODEV,
 177          * so ignore that error but forward any other error.
 178          */
 179         if (IS_ERR(tzd) && (PTR_ERR(tzd) != -ENODEV))
 180                 return PTR_ERR(tzd);
 181
 182         return 0;
 183 }
 184 #else
 185 static int hwmon_thermal_add_sensor(struct device *dev, int index)
 186 {
 187         return 0;
 188 }
 189 #endif /* IS_REACHABLE(CONFIG_THERMAL) && ... */
 190
 191 /* sysfs attribute management */
 192
 193 static ssize_t hwmon_attr_show(struct device *dev,
 194                                struct device_attribute *devattr, char *buf)
 195 {
 196         struct hwmon_device_attribute *hattr = to_hwmon_attr(devattr);
 197         long val;
 198         int ret;
 199
 200         ret = hattr->ops->read(dev, hattr->type, hattr->attr, hattr->index,
 201                                &val);
 202         if (ret < 0)
 203                 return ret;
 204
 205         return sprintf(buf, "%ld\n", val);
 206 }
 207
 208 static ssize_t hwmon_attr_store(struct device *dev,
 209                                 struct device_attribute *devattr,
 210                                 const char *buf, size_t count)
 211 {
 212         struct hwmon_device_attribute *hattr = to_hwmon_attr(devattr);
 213         long val;
 214         int ret;
 215
 216         ret = kstrtol(buf, 10, &val);
 217         if (ret < 0)
 218                 return ret;
 219
 220         ret = hattr->ops->write(dev, hattr->type, hattr->attr, hattr->index,
 221                                 val);
 222         if (ret < 0)
 223                 return ret;
 224
 225         return count;
 226 }
 227
 228 static int hwmon_attr_base(enum hwmon_sensor_types type)
 229 {
 230         if (type == hwmon_in)
 231                 return 0;
 232         return 1;
 233 }
 234
 235 static struct attribute *hwmon_genattr(const void *drvdata,
 236                                        enum hwmon_sensor_types type,
 237                                        u32 attr,
 238                                        int index,
 239                                        const char *template,
 240                                        const struct hwmon_ops *ops)
 241 {
 242         struct hwmon_device_attribute *hattr;
 243         struct device_attribute *dattr;
 244         struct attribute *a;
 245         umode_t mode;
 246         char *name;
 247
 248         /* The attribute is invisible if there is no template string */
 249         if (!template)
 250                 return ERR_PTR(-ENOENT);
 251
 252         mode = ops->is_visible(drvdata, type, attr, index);
 253         if (!mode)
 254                 return ERR_PTR(-ENOENT);
 255
 256         if ((mode & S_IRUGO) && !ops->read)
 257                 return ERR_PTR(-EINVAL);
 258         if ((mode & S_IWUGO) && !ops->write)
 259                 return ERR_PTR(-EINVAL);
 260
 261         hattr = kzalloc(sizeof(*hattr), GFP_KERNEL);
 262         if (!hattr)
 263                 return ERR_PTR(-ENOMEM);
 264
 265         if (type == hwmon_chip) {
 266                 name = (char *)template;
 267         } else {
 268                 scnprintf(hattr->name, sizeof(hattr->name), template,
 269                           index + hwmon_attr_base(type));
 270                 name = hattr->name;
 271         }
 272
 273         hattr->type = type;
 274         hattr->attr = attr;
 275         hattr->index = index;
 276         hattr->ops = ops;
 277
 278         dattr = &hattr->dev_attr;
 279         dattr->show = hwmon_attr_show;
 280         dattr->store = hwmon_attr_store;
 281
 282         a = &dattr->attr;
 283         sysfs_attr_init(a);
 284         a->name = name;
 285         a->mode = mode;
 286
 287         return a;
 288 }
 289
 290 static const char * const hwmon_chip_attr_templates[] = {
 291         [hwmon_chip_temp_reset_history] = "temp_reset_history",
 292         [hwmon_chip_in_reset_history] = "in_reset_history",
 293         [hwmon_chip_curr_reset_history] = "curr_reset_history",
 294         [hwmon_chip_power_reset_history] = "power_reset_history",
 295         [hwmon_chip_update_interval] = "update_interval",
 296         [hwmon_chip_alarms] = "alarms",
 297 };
 298
 299 static const char * const hwmon_temp_attr_templates[] = {
 300         [hwmon_temp_input] = "temp%d_input",
 301         [hwmon_temp_type] = "temp%d_type",
 302         [hwmon_temp_lcrit] = "temp%d_lcrit",
 303         [hwmon_temp_lcrit_hyst] = "temp%d_lcrit_hyst",
 304         [hwmon_temp_min] = "temp%d_min",
 305         [hwmon_temp_min_hyst] = "temp%d_min_hyst",
 306         [hwmon_temp_max] = "temp%d_max",
 307         [hwmon_temp_max_hyst] = "temp%d_max_hyst",
 308         [hwmon_temp_crit] = "temp%d_crit",
 309         [hwmon_temp_crit_hyst] = "temp%d_crit_hyst",
 310         [hwmon_temp_emergency] = "temp%d_emergency",
 311         [hwmon_temp_emergency_hyst] = "temp%d_emergency_hyst",
 312         [hwmon_temp_alarm] = "temp%d_alarm",
 313         [hwmon_temp_lcrit_alarm] = "temp%d_lcrit_alarm",
 314         [hwmon_temp_min_alarm] = "temp%d_min_alarm",
 315         [hwmon_temp_max_alarm] = "temp%d_max_alarm",
 316         [hwmon_temp_crit_alarm] = "temp%d_crit_alarm",
 317         [hwmon_temp_emergency_alarm] = "temp%d_emergency_alarm",
 318         [hwmon_temp_fault] = "temp%d_fault",
 319         [hwmon_temp_offset] = "temp%d_offset",
 320         [hwmon_temp_label] = "temp%d_label",
 321         [hwmon_temp_lowest] = "temp%d_lowest",
 322         [hwmon_temp_highest] = "temp%d_highest",
 323         [hwmon_temp_reset_history] = "temp%d_reset_history",
 324 };
 325
 326 static const char * const hwmon_in_attr_templates[] = {
 327         [hwmon_in_input] = "in%d_input",
 328         [hwmon_in_min] = "in%d_min",
 329         [hwmon_in_max] = "in%d_max",
 330         [hwmon_in_lcrit] = "in%d_lcrit",
 331         [hwmon_in_crit] = "in%d_crit",
 332         [hwmon_in_average] = "in%d_average",
 333         [hwmon_in_lowest] = "in%d_lowest",
 334         [hwmon_in_highest] = "in%d_highest",
 335         [hwmon_in_reset_history] = "in%d_reset_history",
 336         [hwmon_in_label] = "in%d_label",
 337         [hwmon_in_alarm] = "in%d_alarm",
 338         [hwmon_in_min_alarm] = "in%d_min_alarm",
 339         [hwmon_in_max_alarm] = "in%d_max_alarm",
 340         [hwmon_in_lcrit_alarm] = "in%d_lcrit_alarm",
 341         [hwmon_in_crit_alarm] = "in%d_crit_alarm",
 342 };
 343
 344 static const char * const hwmon_curr_attr_templates[] = {
 345         [hwmon_curr_input] = "curr%d_input",
 346         [hwmon_curr_min] = "curr%d_min",
 347         [hwmon_curr_max] = "curr%d_max",
 348         [hwmon_curr_lcrit] = "curr%d_lcrit",
 349         [hwmon_curr_crit] = "curr%d_crit",
 350         [hwmon_curr_average] = "curr%d_average",
 351         [hwmon_curr_lowest] = "curr%d_lowest",
 352         [hwmon_curr_highest] = "curr%d_highest",
 353         [hwmon_curr_reset_history] = "curr%d_reset_history",
 354         [hwmon_curr_label] = "curr%d_label",
 355         [hwmon_curr_alarm] = "curr%d_alarm",
 356         [hwmon_curr_min_alarm] = "curr%d_min_alarm",
 357         [hwmon_curr_max_alarm] = "curr%d_max_alarm",
 358         [hwmon_curr_lcrit_alarm] = "curr%d_lcrit_alarm",
 359         [hwmon_curr_crit_alarm] = "curr%d_crit_alarm",
 360 };
 361
 362 static const char * const hwmon_power_attr_templates[] = {
 363         [hwmon_power_average] = "power%d_average",
 364         [hwmon_power_average_interval] = "power%d_average_interval",
 365         [hwmon_power_average_interval_max] = "power%d_interval_max",
 366         [hwmon_power_average_interval_min] = "power%d_interval_min",
 367         [hwmon_power_average_highest] = "power%d_average_highest",
 368         [hwmon_power_average_lowest] = "power%d_average_lowest",
 369         [hwmon_power_average_max] = "power%d_average_max",
 370         [hwmon_power_average_min] = "power%d_average_min",
 371         [hwmon_power_input] = "power%d_input",
 372         [hwmon_power_input_highest] = "power%d_input_highest",
 373         [hwmon_power_input_lowest] = "power%d_input_lowest",
 374         [hwmon_power_reset_history] = "power%d_reset_history",
 375         [hwmon_power_accuracy] = "power%d_accuracy",
 376         [hwmon_power_cap] = "power%d_cap",
 377         [hwmon_power_cap_hyst] = "power%d_cap_hyst",
 378         [hwmon_power_cap_max] = "power%d_cap_max",
 379         [hwmon_power_cap_min] = "power%d_cap_min",
 380         [hwmon_power_max] = "power%d_max",
 381         [hwmon_power_crit] = "power%d_crit",
 382         [hwmon_power_label] = "power%d_label",
 383         [hwmon_power_alarm] = "power%d_alarm",
 384         [hwmon_power_cap_alarm] = "power%d_cap_alarm",
 385         [hwmon_power_max_alarm] = "power%d_max_alarm",
 386         [hwmon_power_crit_alarm] = "power%d_crit_alarm",
 387 };
 388
 389 static const char * const hwmon_energy_attr_templates[] = {
 390         [hwmon_energy_input] = "energy%d_input",
 391         [hwmon_energy_label] = "energy%d_label",
 392 };
 393
 394 static const char * const hwmon_humidity_attr_templates[] = {
 395         [hwmon_humidity_input] = "humidity%d_input",
 396         [hwmon_humidity_label] = "humidity%d_label",
 397         [hwmon_humidity_min] = "humidity%d_min",
 398         [hwmon_humidity_min_hyst] = "humidity%d_min_hyst",
 399         [hwmon_humidity_max] = "humidity%d_max",
 400         [hwmon_humidity_max_hyst] = "humidity%d_max_hyst",
 401         [hwmon_humidity_alarm] = "humidity%d_alarm",
 402         [hwmon_humidity_fault] = "humidity%d_fault",
 403 };
 404
 405 static const char * const hwmon_fan_attr_templates[] = {
 406         [hwmon_fan_input] = "fan%d_input",
 407         [hwmon_fan_label] = "fan%d_label",
 408         [hwmon_fan_min] = "fan%d_min",
 409         [hwmon_fan_max] = "fan%d_max",
 410         [hwmon_fan_div] = "fan%d_div",
 411         [hwmon_fan_pulses] = "fan%d_pulses",
 412         [hwmon_fan_target] = "fan%d_target",
 413         [hwmon_fan_alarm] = "fan%d_alarm",
 414         [hwmon_fan_min_alarm] = "fan%d_min_alarm",
 415         [hwmon_fan_max_alarm] = "fan%d_max_alarm",
 416         [hwmon_fan_fault] = "fan%d_fault",
 417 };
 418
 419 static const char * const hwmon_pwm_attr_templates[] = {
 420         [hwmon_pwm_input] = "pwm%d",
 421         [hwmon_pwm_enable] = "pwm%d_enable",
 422         [hwmon_pwm_mode] = "pwm%d_mode",
 423         [hwmon_pwm_freq] = "pwm%d_freq",
 424 };
 425
 426 static const char * const *__templates[] = {
 427         [hwmon_chip] = hwmon_chip_attr_templates,
 428         [hwmon_temp] = hwmon_temp_attr_templates,
 429         [hwmon_in] = hwmon_in_attr_templates,
 430         [hwmon_curr] = hwmon_curr_attr_templates,
 431         [hwmon_power] = hwmon_power_attr_templates,
 432         [hwmon_energy] = hwmon_energy_attr_templates,
 433         [hwmon_humidity] = hwmon_humidity_attr_templates,
 434         [hwmon_fan] = hwmon_fan_attr_templates,
 435         [hwmon_pwm] = hwmon_pwm_attr_templates,
 436 };
 437
 438 static const int __templates_size[] = {
 439         [hwmon_chip] = ARRAY_SIZE(hwmon_chip_attr_templates),
 440         [hwmon_temp] = ARRAY_SIZE(hwmon_temp_attr_templates),
 441         [hwmon_in] = ARRAY_SIZE(hwmon_in_attr_templates),
 442         [hwmon_curr] = ARRAY_SIZE(hwmon_curr_attr_templates),
 443         [hwmon_power] = ARRAY_SIZE(hwmon_power_attr_templates),
 444         [hwmon_energy] = ARRAY_SIZE(hwmon_energy_attr_templates),
 445         [hwmon_humidity] = ARRAY_SIZE(hwmon_humidity_attr_templates),
 446         [hwmon_fan] = ARRAY_SIZE(hwmon_fan_attr_templates),
 447         [hwmon_pwm] = ARRAY_SIZE(hwmon_pwm_attr_templates),
 448 };
 449
 450 static int hwmon_num_channel_attrs(const struct hwmon_channel_info *info)
 451 {
 452         int i, n;
 453
 454         for (i = n = 0; info->config[i]; i++)
 455                 n += hweight32(info->config[i]);
 456
 457         return n;
 458 }
 459
 460 static int hwmon_genattrs(const void *drvdata,
 461                           struct attribute **attrs,
 462                           const struct hwmon_ops *ops,
 463                           const struct hwmon_channel_info *info)
 464 {
 465         const char * const *templates;
 466         int template_size;
 467         int i, aindex = 0;
 468
 469         if (info->type >= ARRAY_SIZE(__templates))
 470                 return -EINVAL;
 471
 472         templates = __templates[info->type];
 473         template_size = __templates_size[info->type];
 474
 475         for (i = 0; info->config[i]; i++) {
 476                 u32 attr_mask = info->config[i];
 477                 u32 attr;
 478
 479                 while (attr_mask) {
 480                         struct attribute *a;
 481
 482                         attr = __ffs(attr_mask);
 483                         attr_mask &= ~BIT(attr);
 484                         if (attr >= template_size)
 485                                 return -EINVAL;
 486                         a = hwmon_genattr(drvdata, info->type, attr, i,
 487                                           templates[attr], ops);
 488                         if (IS_ERR(a)) {
 489                                 if (PTR_ERR(a) != -ENOENT)
 490                                         return PTR_ERR(a);
 491                                 continue;
 492                         }
 493                         attrs[aindex++] = a;
 494                 }
 495         }
 496         return aindex;
 497 }
 498
 499 static struct attribute **
 500 __hwmon_create_attrs(const void *drvdata, const struct hwmon_chip_info *chip)
 501 {
 502         int ret, i, aindex = 0, nattrs = 0;
 503         struct attribute **attrs;
 504
 505         for (i = 0; chip->info[i]; i++)
 506                 nattrs += hwmon_num_channel_attrs(chip->info[i]);
 507
 508         if (nattrs == 0)
 509                 return ERR_PTR(-EINVAL);
 510
 511         attrs = kcalloc(nattrs + 1, sizeof(*attrs), GFP_KERNEL);
 512         if (!attrs)
 513                 return ERR_PTR(-ENOMEM);
 514
 515         for (i = 0; chip->info[i]; i++) {
 516                 ret = hwmon_genattrs(drvdata, &attrs[aindex], chip->ops,
 517                                      chip->info[i]);
 518                 if (ret < 0) {
 519                         hwmon_free_attrs(attrs);
 520                         return ERR_PTR(ret);
 521                 }
 522                 aindex += ret;
 523         }
 524
 525         return attrs;
 526 }
 527
 528 static struct device *
 529 __hwmon_device_register(struct device *dev, const char *name, void *drvdata,
 530                         const struct hwmon_chip_info *chip,
 531                         const struct attribute_group **groups)
 532 {
 533         struct hwmon_device *hwdev;
 534         struct device *hdev;
 535         int i, j, err, id;
 536
 537         /* Do not accept invalid characters in hwmon name attribute */
 538         if (name && (!strlen(name) || strpbrk(name, "-* \t\n")))
 539                 return ERR_PTR(-EINVAL);
 540
 541         id = ida_simple_get(&hwmon_ida, 0, 0, GFP_KERNEL);
 542         if (id < 0)
 543                 return ERR_PTR(id);
 544
 545         hwdev = kzalloc(sizeof(*hwdev), GFP_KERNEL);
 546         if (hwdev == NULL) {
 547                 err = -ENOMEM;
 548                 goto ida_remove;
 549         }
 550
 551         hdev = &hwdev->dev;
 552
 553         if (chip && chip->ops->is_visible) {
 554                 struct attribute **attrs;
 555                 int ngroups = 2;
 556
 557                 if (groups)
 558                         for (i = 0; groups[i]; i++)
 559                                 ngroups++;
 560
 561                 hwdev->groups = kcalloc(ngroups, sizeof(*groups), GFP_KERNEL);
 562                 if (!hwdev->groups) {
 563                         err = -ENOMEM;
 564                         goto free_hwmon;
 565                 }
 566
 567                 attrs = __hwmon_create_attrs(drvdata, chip);
 568                 if (IS_ERR(attrs)) {
 569                         err = PTR_ERR(attrs);
 570                         goto free_hwmon;
 571                 }
 572
 573                 hwdev->group.attrs = attrs;
 574                 ngroups = 0;
 575                 hwdev->groups[ngroups++] = &hwdev->group;
 576
 577                 if (groups) {
 578                         for (i = 0; groups[i]; i++)
 579                                 hwdev->groups[ngroups++] = groups[i];
 580                 }
 581
 582                 hdev->groups = hwdev->groups;
 583         } else {
 584                 hdev->groups = groups;
 585         }
 586
 587         hwdev->name = name;
 588         hdev->class = &hwmon_class;
 589         hdev->parent = dev;
 590         hdev->of_node = dev ? dev->of_node : NULL;
 591         hwdev->chip = chip;
 592         dev_set_drvdata(hdev, drvdata);
 593         dev_set_name(hdev, HWMON_ID_FORMAT, id);
 594         err = device_register(hdev);
 595         if (err) {
 596                 put_device(hdev);
 597                 goto ida_remove;
 598         }
 599
 600         if (chip && chip->ops->is_visible && chip->ops->read &&
 601             chip->info[0]->type == hwmon_chip &&
 602             (chip->info[0]->config[0] & HWMON_C_REGISTER_TZ)) {
 603                 const struct hwmon_channel_info **info = chip->info;
 604
 605                 for (i = 1; info[i]; i++) {
 606                         if (info[i]->type != hwmon_temp)
 607                                 continue;
 608
 609                         for (j = 0; info[i]->config[j]; j++) {
 610                                 if (!chip->ops->is_visible(drvdata, hwmon_temp,
 611                                                            hwmon_temp_input, j))
 612                                         continue;
 613                                 if (info[i]->config[j] & HWMON_T_INPUT) {
 614                                         err = hwmon_thermal_add_sensor(hdev, j);
 615                                         if (err) {
 616                                                 device_unregister(hdev);
 617                                                 goto ida_remove;
 618                                         }
 619                                 }
 620                         }
 621                 }
 622         }
 623
 624         return hdev;
 625
 626 free_hwmon:
 627         hwmon_dev_release(hdev);
 628 ida_remove:
 629         ida_simple_remove(&hwmon_ida, id);
 630         return ERR_PTR(err);
 631 }
 632
 633 /**
 634  * hwmon_device_register_with_groups - register w/ hwmon
 635  * @dev: the parent device
 636  * @name: hwmon name attribute
 637  * @drvdata: driver data to attach to created device
 638  * @groups: List of attribute groups to create
 639  *
 640  * hwmon_device_unregister() must be called when the device is no
 641  * longer needed.
 642  *
 643  * Returns the pointer to the new device.
 644  */
 645 struct device *
 646 hwmon_device_register_with_groups(struct device *dev, const char *name,
 647                                   void *drvdata,
 648                                   const struct attribute_group **groups)
 649 {
 650         return __hwmon_device_register(dev, name, drvdata, NULL, groups);
 651 }
 652 EXPORT_SYMBOL_GPL(hwmon_device_register_with_groups);
 653
 654 /**
 655  * hwmon_device_register_with_info - register w/ hwmon
 656  * @dev: the parent device
 657  * @name: hwmon name attribute
 658  * @drvdata: driver data to attach to created device
 659  * @info: Pointer to hwmon chip information
 660  * @groups - pointer to list of driver specific attribute groups
 661  *
 662  * hwmon_device_unregister() must be called when the device is no
 663  * longer needed.
 664  *
 665  * Returns the pointer to the new device.
 666  */
 667 struct device *
 668 hwmon_device_register_with_info(struct device *dev, const char *name,
 669                                 void *drvdata,
 670                                 const struct hwmon_chip_info *chip,
 671                                 const struct attribute_group **groups)
 672 {
 673         if (chip && (!chip->ops || !chip->info))
 674                 return ERR_PTR(-EINVAL);
 675
 676         return __hwmon_device_register(dev, name, drvdata, chip, groups);
 677 }
 678 EXPORT_SYMBOL_GPL(hwmon_device_register_with_info);
 679
 680 /**
 681  * hwmon_device_register - register w/ hwmon
 682  * @dev: the device to register
 683  *
 684  * hwmon_device_unregister() must be called when the device is no
 685  * longer needed.
 686  *
 687  * Returns the pointer to the new device.
 688  */
 689 struct device *hwmon_device_register(struct device *dev)
 690 {
 691         return hwmon_device_register_with_groups(dev, NULL, NULL, NULL);
 692 }
 693 EXPORT_SYMBOL_GPL(hwmon_device_register);
 694
 695 /**
 696  * hwmon_device_unregister - removes the previously registered class device
 697  *
 698  * @dev: the class device to destroy
 699  */
 700 void hwmon_device_unregister(struct device *dev)
 701 {
 702         int id;
 703
 704         if (likely(sscanf(dev_name(dev), HWMON_ID_FORMAT, &id) == 1)) {
 705                 device_unregister(dev);
 706                 ida_simple_remove(&hwmon_ida, id);
 707         } else
 708                 dev_dbg(dev->parent,
 709                         "hwmon_device_unregister() failed: bad class ID!\n");
 710 }
 711 EXPORT_SYMBOL_GPL(hwmon_device_unregister);
 712
 713 static void devm_hwmon_release(struct device *dev, void *res)
 714 {
 715         struct device *hwdev = *(struct device **)res;
 716
 717         hwmon_device_unregister(hwdev);
 718 }
 719
 720 /**
 721  * devm_hwmon_device_register_with_groups - register w/ hwmon
 722  * @dev: the parent device
 723  * @name: hwmon name attribute
 724  * @drvdata: driver data to attach to created device
 725  * @groups: List of attribute groups to create
 726  *
 727  * Returns the pointer to the new device. The new device is automatically
 728  * unregistered with the parent device.
 729  */
 730 struct device *
 731 devm_hwmon_device_register_with_groups(struct device *dev, const char *name,
 732                                        void *drvdata,
 733                                        const struct attribute_group **groups)
 734 {
 735         struct device **ptr, *hwdev;
 736
 737         if (!dev)
 738                 return ERR_PTR(-EINVAL);
 739
 740         ptr = devres_alloc(devm_hwmon_release, sizeof(*ptr), GFP_KERNEL);
 741         if (!ptr)
 742                 return ERR_PTR(-ENOMEM);
 743
 744         hwdev = hwmon_device_register_with_groups(dev, name, drvdata, groups);
 745         if (IS_ERR(hwdev))
 746                 goto error;
 747
 748         *ptr = hwdev;
 749         devres_add(dev, ptr);
 750         return hwdev;
 751
 752 error:
 753         devres_free(ptr);
 754         return hwdev;
 755 }
 756 EXPORT_SYMBOL_GPL(devm_hwmon_device_register_with_groups);
 757
 758 /**
 759  * devm_hwmon_device_register_with_info - register w/ hwmon
 760  * @dev: the parent device
 761  * @name: hwmon name attribute
 762  * @drvdata: driver data to attach to created device
 763  * @info: Pointer to hwmon chip information
 764  * @groups - pointer to list of driver specific attribute groups
 765  *
 766  * Returns the pointer to the new device. The new device is automatically
 767  * unregistered with the parent device.
 768  */
 769 struct device *
 770 devm_hwmon_device_register_with_info(struct device *dev, const char *name,
 771                                      void *drvdata,
 772                                      const struct hwmon_chip_info *chip,
 773                                      const struct attribute_group **groups)
 774 {
 775         struct device **ptr, *hwdev;
 776
 777         if (!dev)
 778                 return ERR_PTR(-EINVAL);
 779
 780         ptr = devres_alloc(devm_hwmon_release, sizeof(*ptr), GFP_KERNEL);
 781         if (!ptr)
 782                 return ERR_PTR(-ENOMEM);
 783
 784         hwdev = hwmon_device_register_with_info(dev, name, drvdata, chip,
 785                                                 groups);
 786         if (IS_ERR(hwdev))
 787                 goto error;
 788
 789         *ptr = hwdev;
 790         devres_add(dev, ptr);
 791
 792         return hwdev;
 793
 794 error:
 795         devres_free(ptr);
 796         return hwdev;
 797 }
 798 EXPORT_SYMBOL_GPL(devm_hwmon_device_register_with_info);
 799
 800 static int devm_hwmon_match(struct device *dev, void *res, void *data)
 801 {
 802         struct device **hwdev = res;
 803
 804         return *hwdev == data;
 805 }
 806
 807 /**
 808  * devm_hwmon_device_unregister - removes a previously registered hwmon device
 809  *
 810  * @dev: the parent device of the device to unregister
 811  */
 812 void devm_hwmon_device_unregister(struct device *dev)
 813 {
 814         WARN_ON(devres_release(dev, devm_hwmon_release, devm_hwmon_match, dev));
 815 }
 816 EXPORT_SYMBOL_GPL(devm_hwmon_device_unregister);
 817
 818 static void __init hwmon_pci_quirks(void)
 819 {
 820 #if defined CONFIG_X86 && defined CONFIG_PCI
 821         struct pci_dev *sb;
 822         u16 base;
 823         u8 enable;
 824
 825         /* Open access to 0x295-0x296 on MSI MS-7031 */
 826         sb = pci_get_device(PCI_VENDOR_ID_ATI, 0x436c, NULL);
 827         if (sb) {
 828                 if (sb->subsystem_vendor == 0x1462 &&   /* MSI */
 829                     sb->subsystem_device == 0x0031) {   /* MS-7031 */
 830                         pci_read_config_byte(sb, 0x48, &enable);
 831                         pci_read_config_word(sb, 0x64, &base);
 832
 833                         if (base == 0 && !(enable & BIT(2))) {
 834                                 dev_info(&sb->dev,
 835                                          "Opening wide generic port at 0x295\n");
 836                                 pci_write_config_word(sb, 0x64, 0x295);
 837                                 pci_write_config_byte(sb, 0x48,
 838                                                       enable | BIT(2));
 839                         }
 840                 }
 841                 pci_dev_put(sb);
 842         }
 843 #endif
 844 }
 845
 846 static int __init hwmon_init(void)
 847 {
 848         int err;
 849
 850         hwmon_pci_quirks();
 851
 852         err = class_register(&hwmon_class);
 853         if (err) {
 854                 pr_err("couldn't register hwmon sysfs class\n");
 855                 return err;
 856         }
 857         return 0;
 858 }
 859
 860 static void __exit hwmon_exit(void)
 861 {
 862         class_unregister(&hwmon_class);
 863 }
 864
 865 subsys_initcall(hwmon_init);
 866 module_exit(hwmon_exit);
 867
 868 MODULE_AUTHOR("Mark M. Hoffman <mhoffman@lightlink.com>");
 869 MODULE_DESCRIPTION("hardware monitoring sysfs/class support");
 870 MODULE_LICENSE("GPL");
 871