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 CREATE_TRACE_POINTS
  28 #include <trace/events/hwmon.h>
  29
  30 #define HWMON_ID_PREFIX "hwmon"
  31 #define HWMON_ID_FORMAT HWMON_ID_PREFIX "%d"
  32
  33 struct hwmon_device {
  34         const char *name;
  35         struct device dev;
  36         const struct hwmon_chip_info *chip;
  37
  38         struct attribute_group group;
  39         const struct attribute_group **groups;
  40 };
  41
  42 #define to_hwmon_device(d) container_of(d, struct hwmon_device, dev)
  43
  44 #define MAX_SYSFS_ATTR_NAME_LENGTH      32
  45
  46 struct hwmon_device_attribute {
  47         struct device_attribute dev_attr;
  48         const struct hwmon_ops *ops;
  49         enum hwmon_sensor_types type;
  50         u32 attr;
  51         int index;
  52         char name[MAX_SYSFS_ATTR_NAME_LENGTH];
  53 };
  54
  55 #define to_hwmon_attr(d) \
  56         container_of(d, struct hwmon_device_attribute, dev_attr)
  57
  58 /*
  59  * Thermal zone information
  60  * In addition to the reference to the hwmon device,
  61  * also provides the sensor index.
  62  */
  63 struct hwmon_thermal_data {
  64         struct hwmon_device *hwdev;     /* Reference to hwmon device */
  65         int index;                      /* sensor index */
  66 };
  67
  68 static ssize_t
  69 name_show(struct device *dev, struct device_attribute *attr, char *buf)
  70 {
  71         return sprintf(buf, "%s\n", to_hwmon_device(dev)->name);
  72 }
  73 static DEVICE_ATTR_RO(name);
  74
  75 static struct attribute *hwmon_dev_attrs[] = {
  76         &dev_attr_name.attr,
  77         NULL
  78 };
  79
  80 static umode_t hwmon_dev_name_is_visible(struct kobject *kobj,
  81                                          struct attribute *attr, int n)
  82 {
  83         struct device *dev = container_of(kobj, struct device, kobj);
  84
  85         if (to_hwmon_device(dev)->name == NULL)
  86                 return 0;
  87
  88         return attr->mode;
  89 }
  90
  91 static const struct attribute_group hwmon_dev_attr_group = {
  92         .attrs          = hwmon_dev_attrs,
  93         .is_visible     = hwmon_dev_name_is_visible,
  94 };
  95
  96 static const struct attribute_group *hwmon_dev_attr_groups[] = {
  97         &hwmon_dev_attr_group,
  98         NULL
  99 };
 100
 101 static void hwmon_dev_release(struct device *dev)
 102 {
 103         kfree(to_hwmon_device(dev));
 104 }
 105
 106 static struct class hwmon_class = {
 107         .name = "hwmon",
 108         .owner = THIS_MODULE,
 109         .dev_groups = hwmon_dev_attr_groups,
 110         .dev_release = hwmon_dev_release,
 111 };
 112
 113 static DEFINE_IDA(hwmon_ida);
 114
 115 /* Thermal zone handling */
 116
 117 /*
 118  * The complex conditional is necessary to avoid a cyclic dependency
 119  * between hwmon and thermal_sys modules.
 120  */
 121 #if IS_REACHABLE(CONFIG_THERMAL) && defined(CONFIG_THERMAL_OF) && \
 122         (!defined(CONFIG_THERMAL_HWMON) || \
 123          !(defined(MODULE) && IS_MODULE(CONFIG_THERMAL)))
 124 static int hwmon_thermal_get_temp(void *data, int *temp)
 125 {
 126         struct hwmon_thermal_data *tdata = data;
 127         struct hwmon_device *hwdev = tdata->hwdev;
 128         int ret;
 129         long t;
 130
 131         ret = hwdev->chip->ops->read(&hwdev->dev, hwmon_temp, hwmon_temp_input,
 132                                      tdata->index, &t);
 133         if (ret < 0)
 134                 return ret;
 135
 136         *temp = t;
 137
 138         return 0;
 139 }
 140
 141 static const struct thermal_zone_of_device_ops hwmon_thermal_ops = {
 142         .get_temp = hwmon_thermal_get_temp,
 143 };
 144
 145 static int hwmon_thermal_add_sensor(struct device *dev,
 146                                     struct hwmon_device *hwdev, int index)
 147 {
 148         struct hwmon_thermal_data *tdata;
 149         struct thermal_zone_device *tzd;
 150
 151         tdata = devm_kzalloc(dev, sizeof(*tdata), GFP_KERNEL);
 152         if (!tdata)
 153                 return -ENOMEM;
 154
 155         tdata->hwdev = hwdev;
 156         tdata->index = index;
 157
 158         tzd = devm_thermal_zone_of_sensor_register(&hwdev->dev, index, tdata,
 159                                                    &hwmon_thermal_ops);
 160         /*
 161          * If CONFIG_THERMAL_OF is disabled, this returns -ENODEV,
 162          * so ignore that error but forward any other error.
 163          */
 164         if (IS_ERR(tzd) && (PTR_ERR(tzd) != -ENODEV))
 165                 return PTR_ERR(tzd);
 166
 167         return 0;
 168 }
 169 #else
 170 static int hwmon_thermal_add_sensor(struct device *dev,
 171                                     struct hwmon_device *hwdev, int index)
 172 {
 173         return 0;
 174 }
 175 #endif /* IS_REACHABLE(CONFIG_THERMAL) && ... */
 176
 177 static int hwmon_attr_base(enum hwmon_sensor_types type)
 178 {
 179         if (type == hwmon_in)
 180                 return 0;
 181         return 1;
 182 }
 183
 184 /* sysfs attribute management */
 185
 186 static ssize_t hwmon_attr_show(struct device *dev,
 187                                struct device_attribute *devattr, char *buf)
 188 {
 189         struct hwmon_device_attribute *hattr = to_hwmon_attr(devattr);
 190         long val;
 191         int ret;
 192
 193         ret = hattr->ops->read(dev, hattr->type, hattr->attr, hattr->index,
 194                                &val);
 195         if (ret < 0)
 196                 return ret;
 197
 198         trace_hwmon_attr_show(hattr->index + hwmon_attr_base(hattr->type),
 199                               hattr->name, val);
 200
 201         return sprintf(buf, "%ld\n", val);
 202 }
 203
 204 static ssize_t hwmon_attr_show_string(struct device *dev,
 205                                       struct device_attribute *devattr,
 206                                       char *buf)
 207 {
 208         struct hwmon_device_attribute *hattr = to_hwmon_attr(devattr);
 209         enum hwmon_sensor_types type = hattr->type;
 210         const char *s;
 211         int ret;
 212
 213         ret = hattr->ops->read_string(dev, hattr->type, hattr->attr,
 214                                       hattr->index, &s);
 215         if (ret < 0)
 216                 return ret;
 217
 218         trace_hwmon_attr_show_string(hattr->index + hwmon_attr_base(type),
 219                                      hattr->name, s);
 220
 221         return sprintf(buf, "%s\n", s);
 222 }
 223
 224 static ssize_t hwmon_attr_store(struct device *dev,
 225                                 struct device_attribute *devattr,
 226                                 const char *buf, size_t count)
 227 {
 228         struct hwmon_device_attribute *hattr = to_hwmon_attr(devattr);
 229         long val;
 230         int ret;
 231
 232         ret = kstrtol(buf, 10, &val);
 233         if (ret < 0)
 234                 return ret;
 235
 236         ret = hattr->ops->write(dev, hattr->type, hattr->attr, hattr->index,
 237                                 val);
 238         if (ret < 0)
 239                 return ret;
 240
 241         trace_hwmon_attr_store(hattr->index + hwmon_attr_base(hattr->type),
 242                                hattr->name, val);
 243
 244         return count;
 245 }
 246
 247 static bool is_string_attr(enum hwmon_sensor_types type, u32 attr)
 248 {
 249         return (type == hwmon_temp && attr == hwmon_temp_label) ||
 250                (type == hwmon_in && attr == hwmon_in_label) ||
 251                (type == hwmon_curr && attr == hwmon_curr_label) ||
 252                (type == hwmon_power && attr == hwmon_power_label) ||
 253                (type == hwmon_energy && attr == hwmon_energy_label) ||
 254                (type == hwmon_humidity && attr == hwmon_humidity_label) ||
 255                (type == hwmon_fan && attr == hwmon_fan_label);
 256 }
 257
 258 static struct attribute *hwmon_genattr(struct device *dev,
 259                                        const void *drvdata,
 260                                        enum hwmon_sensor_types type,
 261                                        u32 attr,
 262                                        int index,
 263                                        const char *template,
 264                                        const struct hwmon_ops *ops)
 265 {
 266         struct hwmon_device_attribute *hattr;
 267         struct device_attribute *dattr;
 268         struct attribute *a;
 269         umode_t mode;
 270         const char *name;
 271         bool is_string = is_string_attr(type, attr);
 272
 273         /* The attribute is invisible if there is no template string */
 274         if (!template)
 275                 return ERR_PTR(-ENOENT);
 276
 277         mode = ops->is_visible(drvdata, type, attr, index);
 278         if (!mode)
 279                 return ERR_PTR(-ENOENT);
 280
 281         if ((mode & 0444) && ((is_string && !ops->read_string) ||
 282                                  (!is_string && !ops->read)))
 283                 return ERR_PTR(-EINVAL);
 284         if ((mode & 0222) && !ops->write)
 285                 return ERR_PTR(-EINVAL);
 286
 287         hattr = devm_kzalloc(dev, sizeof(*hattr), GFP_KERNEL);
 288         if (!hattr)
 289                 return ERR_PTR(-ENOMEM);
 290
 291         if (type == hwmon_chip) {
 292                 name = template;
 293         } else {
 294                 scnprintf(hattr->name, sizeof(hattr->name), template,
 295                           index + hwmon_attr_base(type));
 296                 name = hattr->name;
 297         }
 298
 299         hattr->type = type;
 300         hattr->attr = attr;
 301         hattr->index = index;
 302         hattr->ops = ops;
 303
 304         dattr = &hattr->dev_attr;
 305         dattr->show = is_string ? hwmon_attr_show_string : hwmon_attr_show;
 306         dattr->store = hwmon_attr_store;
 307
 308         a = &dattr->attr;
 309         sysfs_attr_init(a);
 310         a->name = name;
 311         a->mode = mode;
 312
 313         return a;
 314 }
 315
 316 /*
 317  * Chip attributes are not attribute templates but actual sysfs attributes.
 318  * See hwmon_genattr() for special handling.
 319  */
 320 static const char * const hwmon_chip_attrs[] = {
 321         [hwmon_chip_temp_reset_history] = "temp_reset_history",
 322         [hwmon_chip_in_reset_history] = "in_reset_history",
 323         [hwmon_chip_curr_reset_history] = "curr_reset_history",
 324         [hwmon_chip_power_reset_history] = "power_reset_history",
 325         [hwmon_chip_update_interval] = "update_interval",
 326         [hwmon_chip_alarms] = "alarms",
 327         [hwmon_chip_samples] = "samples",
 328         [hwmon_chip_curr_samples] = "curr_samples",
 329         [hwmon_chip_in_samples] = "in_samples",
 330         [hwmon_chip_power_samples] = "power_samples",
 331         [hwmon_chip_temp_samples] = "temp_samples",
 332 };
 333
 334 static const char * const hwmon_temp_attr_templates[] = {
 335         [hwmon_temp_input] = "temp%d_input",
 336         [hwmon_temp_type] = "temp%d_type",
 337         [hwmon_temp_lcrit] = "temp%d_lcrit",
 338         [hwmon_temp_lcrit_hyst] = "temp%d_lcrit_hyst",
 339         [hwmon_temp_min] = "temp%d_min",
 340         [hwmon_temp_min_hyst] = "temp%d_min_hyst",
 341         [hwmon_temp_max] = "temp%d_max",
 342         [hwmon_temp_max_hyst] = "temp%d_max_hyst",
 343         [hwmon_temp_crit] = "temp%d_crit",
 344         [hwmon_temp_crit_hyst] = "temp%d_crit_hyst",
 345         [hwmon_temp_emergency] = "temp%d_emergency",
 346         [hwmon_temp_emergency_hyst] = "temp%d_emergency_hyst",
 347         [hwmon_temp_alarm] = "temp%d_alarm",
 348         [hwmon_temp_lcrit_alarm] = "temp%d_lcrit_alarm",
 349         [hwmon_temp_min_alarm] = "temp%d_min_alarm",
 350         [hwmon_temp_max_alarm] = "temp%d_max_alarm",
 351         [hwmon_temp_crit_alarm] = "temp%d_crit_alarm",
 352         [hwmon_temp_emergency_alarm] = "temp%d_emergency_alarm",
 353         [hwmon_temp_fault] = "temp%d_fault",
 354         [hwmon_temp_offset] = "temp%d_offset",
 355         [hwmon_temp_label] = "temp%d_label",
 356         [hwmon_temp_lowest] = "temp%d_lowest",
 357         [hwmon_temp_highest] = "temp%d_highest",
 358         [hwmon_temp_reset_history] = "temp%d_reset_history",
 359 };
 360
 361 static const char * const hwmon_in_attr_templates[] = {
 362         [hwmon_in_input] = "in%d_input",
 363         [hwmon_in_min] = "in%d_min",
 364         [hwmon_in_max] = "in%d_max",
 365         [hwmon_in_lcrit] = "in%d_lcrit",
 366         [hwmon_in_crit] = "in%d_crit",
 367         [hwmon_in_average] = "in%d_average",
 368         [hwmon_in_lowest] = "in%d_lowest",
 369         [hwmon_in_highest] = "in%d_highest",
 370         [hwmon_in_reset_history] = "in%d_reset_history",
 371         [hwmon_in_label] = "in%d_label",
 372         [hwmon_in_alarm] = "in%d_alarm",
 373         [hwmon_in_min_alarm] = "in%d_min_alarm",
 374         [hwmon_in_max_alarm] = "in%d_max_alarm",
 375         [hwmon_in_lcrit_alarm] = "in%d_lcrit_alarm",
 376         [hwmon_in_crit_alarm] = "in%d_crit_alarm",
 377         [hwmon_in_enable] = "in%d_enable",
 378 };
 379
 380 static const char * const hwmon_curr_attr_templates[] = {
 381         [hwmon_curr_input] = "curr%d_input",
 382         [hwmon_curr_min] = "curr%d_min",
 383         [hwmon_curr_max] = "curr%d_max",
 384         [hwmon_curr_lcrit] = "curr%d_lcrit",
 385         [hwmon_curr_crit] = "curr%d_crit",
 386         [hwmon_curr_average] = "curr%d_average",
 387         [hwmon_curr_lowest] = "curr%d_lowest",
 388         [hwmon_curr_highest] = "curr%d_highest",
 389         [hwmon_curr_reset_history] = "curr%d_reset_history",
 390         [hwmon_curr_label] = "curr%d_label",
 391         [hwmon_curr_alarm] = "curr%d_alarm",
 392         [hwmon_curr_min_alarm] = "curr%d_min_alarm",
 393         [hwmon_curr_max_alarm] = "curr%d_max_alarm",
 394         [hwmon_curr_lcrit_alarm] = "curr%d_lcrit_alarm",
 395         [hwmon_curr_crit_alarm] = "curr%d_crit_alarm",
 396 };
 397
 398 static const char * const hwmon_power_attr_templates[] = {
 399         [hwmon_power_average] = "power%d_average",
 400         [hwmon_power_average_interval] = "power%d_average_interval",
 401         [hwmon_power_average_interval_max] = "power%d_interval_max",
 402         [hwmon_power_average_interval_min] = "power%d_interval_min",
 403         [hwmon_power_average_highest] = "power%d_average_highest",
 404         [hwmon_power_average_lowest] = "power%d_average_lowest",
 405         [hwmon_power_average_max] = "power%d_average_max",
 406         [hwmon_power_average_min] = "power%d_average_min",
 407         [hwmon_power_input] = "power%d_input",
 408         [hwmon_power_input_highest] = "power%d_input_highest",
 409         [hwmon_power_input_lowest] = "power%d_input_lowest",
 410         [hwmon_power_reset_history] = "power%d_reset_history",
 411         [hwmon_power_accuracy] = "power%d_accuracy",
 412         [hwmon_power_cap] = "power%d_cap",
 413         [hwmon_power_cap_hyst] = "power%d_cap_hyst",
 414         [hwmon_power_cap_max] = "power%d_cap_max",
 415         [hwmon_power_cap_min] = "power%d_cap_min",
 416         [hwmon_power_min] = "power%d_min",
 417         [hwmon_power_max] = "power%d_max",
 418         [hwmon_power_lcrit] = "power%d_lcrit",
 419         [hwmon_power_crit] = "power%d_crit",
 420         [hwmon_power_label] = "power%d_label",
 421         [hwmon_power_alarm] = "power%d_alarm",
 422         [hwmon_power_cap_alarm] = "power%d_cap_alarm",
 423         [hwmon_power_min_alarm] = "power%d_min_alarm",
 424         [hwmon_power_max_alarm] = "power%d_max_alarm",
 425         [hwmon_power_lcrit_alarm] = "power%d_lcrit_alarm",
 426         [hwmon_power_crit_alarm] = "power%d_crit_alarm",
 427 };
 428
 429 static const char * const hwmon_energy_attr_templates[] = {
 430         [hwmon_energy_input] = "energy%d_input",
 431         [hwmon_energy_label] = "energy%d_label",
 432 };
 433
 434 static const char * const hwmon_humidity_attr_templates[] = {
 435         [hwmon_humidity_input] = "humidity%d_input",
 436         [hwmon_humidity_label] = "humidity%d_label",
 437         [hwmon_humidity_min] = "humidity%d_min",
 438         [hwmon_humidity_min_hyst] = "humidity%d_min_hyst",
 439         [hwmon_humidity_max] = "humidity%d_max",
 440         [hwmon_humidity_max_hyst] = "humidity%d_max_hyst",
 441         [hwmon_humidity_alarm] = "humidity%d_alarm",
 442         [hwmon_humidity_fault] = "humidity%d_fault",
 443 };
 444
 445 static const char * const hwmon_fan_attr_templates[] = {
 446         [hwmon_fan_input] = "fan%d_input",
 447         [hwmon_fan_label] = "fan%d_label",
 448         [hwmon_fan_min] = "fan%d_min",
 449         [hwmon_fan_max] = "fan%d_max",
 450         [hwmon_fan_div] = "fan%d_div",
 451         [hwmon_fan_pulses] = "fan%d_pulses",
 452         [hwmon_fan_target] = "fan%d_target",
 453         [hwmon_fan_alarm] = "fan%d_alarm",
 454         [hwmon_fan_min_alarm] = "fan%d_min_alarm",
 455         [hwmon_fan_max_alarm] = "fan%d_max_alarm",
 456         [hwmon_fan_fault] = "fan%d_fault",
 457 };
 458
 459 static const char * const hwmon_pwm_attr_templates[] = {
 460         [hwmon_pwm_input] = "pwm%d",
 461         [hwmon_pwm_enable] = "pwm%d_enable",
 462         [hwmon_pwm_mode] = "pwm%d_mode",
 463         [hwmon_pwm_freq] = "pwm%d_freq",
 464 };
 465
 466 static const char * const *__templates[] = {
 467         [hwmon_chip] = hwmon_chip_attrs,
 468         [hwmon_temp] = hwmon_temp_attr_templates,
 469         [hwmon_in] = hwmon_in_attr_templates,
 470         [hwmon_curr] = hwmon_curr_attr_templates,
 471         [hwmon_power] = hwmon_power_attr_templates,
 472         [hwmon_energy] = hwmon_energy_attr_templates,
 473         [hwmon_humidity] = hwmon_humidity_attr_templates,
 474         [hwmon_fan] = hwmon_fan_attr_templates,
 475         [hwmon_pwm] = hwmon_pwm_attr_templates,
 476 };
 477
 478 static const int __templates_size[] = {
 479         [hwmon_chip] = ARRAY_SIZE(hwmon_chip_attrs),
 480         [hwmon_temp] = ARRAY_SIZE(hwmon_temp_attr_templates),
 481         [hwmon_in] = ARRAY_SIZE(hwmon_in_attr_templates),
 482         [hwmon_curr] = ARRAY_SIZE(hwmon_curr_attr_templates),
 483         [hwmon_power] = ARRAY_SIZE(hwmon_power_attr_templates),
 484         [hwmon_energy] = ARRAY_SIZE(hwmon_energy_attr_templates),
 485         [hwmon_humidity] = ARRAY_SIZE(hwmon_humidity_attr_templates),
 486         [hwmon_fan] = ARRAY_SIZE(hwmon_fan_attr_templates),
 487         [hwmon_pwm] = ARRAY_SIZE(hwmon_pwm_attr_templates),
 488 };
 489
 490 static int hwmon_num_channel_attrs(const struct hwmon_channel_info *info)
 491 {
 492         int i, n;
 493
 494         for (i = n = 0; info->config[i]; i++)
 495                 n += hweight32(info->config[i]);
 496
 497         return n;
 498 }
 499
 500 static int hwmon_genattrs(struct device *dev,
 501                           const void *drvdata,
 502                           struct attribute **attrs,
 503                           const struct hwmon_ops *ops,
 504                           const struct hwmon_channel_info *info)
 505 {
 506         const char * const *templates;
 507         int template_size;
 508         int i, aindex = 0;
 509
 510         if (info->type >= ARRAY_SIZE(__templates))
 511                 return -EINVAL;
 512
 513         templates = __templates[info->type];
 514         template_size = __templates_size[info->type];
 515
 516         for (i = 0; info->config[i]; i++) {
 517                 u32 attr_mask = info->config[i];
 518                 u32 attr;
 519
 520                 while (attr_mask) {
 521                         struct attribute *a;
 522
 523                         attr = __ffs(attr_mask);
 524                         attr_mask &= ~BIT(attr);
 525                         if (attr >= template_size)
 526                                 return -EINVAL;
 527                         a = hwmon_genattr(dev, drvdata, info->type, attr, i,
 528                                           templates[attr], ops);
 529                         if (IS_ERR(a)) {
 530                                 if (PTR_ERR(a) != -ENOENT)
 531                                         return PTR_ERR(a);
 532                                 continue;
 533                         }
 534                         attrs[aindex++] = a;
 535                 }
 536         }
 537         return aindex;
 538 }
 539
 540 static struct attribute **
 541 __hwmon_create_attrs(struct device *dev, const void *drvdata,
 542                      const struct hwmon_chip_info *chip)
 543 {
 544         int ret, i, aindex = 0, nattrs = 0;
 545         struct attribute **attrs;
 546
 547         for (i = 0; chip->info[i]; i++)
 548                 nattrs += hwmon_num_channel_attrs(chip->info[i]);
 549
 550         if (nattrs == 0)
 551                 return ERR_PTR(-EINVAL);
 552
 553         attrs = devm_kcalloc(dev, nattrs + 1, sizeof(*attrs), GFP_KERNEL);
 554         if (!attrs)
 555                 return ERR_PTR(-ENOMEM);
 556
 557         for (i = 0; chip->info[i]; i++) {
 558                 ret = hwmon_genattrs(dev, drvdata, &attrs[aindex], chip->ops,
 559                                      chip->info[i]);
 560                 if (ret < 0)
 561                         return ERR_PTR(ret);
 562                 aindex += ret;
 563         }
 564
 565         return attrs;
 566 }
 567
 568 static struct device *
 569 __hwmon_device_register(struct device *dev, const char *name, void *drvdata,
 570                         const struct hwmon_chip_info *chip,
 571                         const struct attribute_group **groups)
 572 {
 573         struct hwmon_device *hwdev;
 574         struct device *hdev;
 575         int i, j, err, id;
 576
 577         /* Complain about invalid characters in hwmon name attribute */
 578         if (name && (!strlen(name) || strpbrk(name, "-* \t\n")))
 579                 dev_warn(dev,
 580                          "hwmon: '%s' is not a valid name attribute, please fix\n",
 581                          name);
 582
 583         id = ida_simple_get(&hwmon_ida, 0, 0, GFP_KERNEL);
 584         if (id < 0)
 585                 return ERR_PTR(id);
 586
 587         hwdev = kzalloc(sizeof(*hwdev), GFP_KERNEL);
 588         if (hwdev == NULL) {
 589                 err = -ENOMEM;
 590                 goto ida_remove;
 591         }
 592
 593         hdev = &hwdev->dev;
 594
 595         if (chip) {
 596                 struct attribute **attrs;
 597                 int ngroups = 2; /* terminating NULL plus &hwdev->groups */
 598
 599                 if (groups)
 600                         for (i = 0; groups[i]; i++)
 601                                 ngroups++;
 602
 603                 hwdev->groups = devm_kcalloc(dev, ngroups, sizeof(*groups),
 604                                              GFP_KERNEL);
 605                 if (!hwdev->groups) {
 606                         err = -ENOMEM;
 607                         goto free_hwmon;
 608                 }
 609
 610                 attrs = __hwmon_create_attrs(dev, drvdata, chip);
 611                 if (IS_ERR(attrs)) {
 612                         err = PTR_ERR(attrs);
 613                         goto free_hwmon;
 614                 }
 615
 616                 hwdev->group.attrs = attrs;
 617                 ngroups = 0;
 618                 hwdev->groups[ngroups++] = &hwdev->group;
 619
 620                 if (groups) {
 621                         for (i = 0; groups[i]; i++)
 622                                 hwdev->groups[ngroups++] = groups[i];
 623                 }
 624
 625                 hdev->groups = hwdev->groups;
 626         } else {
 627                 hdev->groups = groups;
 628         }
 629
 630         hwdev->name = name;
 631         hdev->class = &hwmon_class;
 632         hdev->parent = dev;
 633         hdev->of_node = dev ? dev->of_node : NULL;
 634         hwdev->chip = chip;
 635         dev_set_drvdata(hdev, drvdata);
 636         dev_set_name(hdev, HWMON_ID_FORMAT, id);
 637         err = device_register(hdev);
 638         if (err)
 639                 goto free_hwmon;
 640
 641         if (dev && chip && chip->ops->read &&
 642             chip->info[0]->type == hwmon_chip &&
 643             (chip->info[0]->config[0] & HWMON_C_REGISTER_TZ)) {
 644                 const struct hwmon_channel_info **info = chip->info;
 645
 646                 for (i = 1; info[i]; i++) {
 647                         if (info[i]->type != hwmon_temp)
 648                                 continue;
 649
 650                         for (j = 0; info[i]->config[j]; j++) {
 651                                 if (!chip->ops->is_visible(drvdata, hwmon_temp,
 652                                                            hwmon_temp_input, j))
 653                                         continue;
 654                                 if (info[i]->config[j] & HWMON_T_INPUT) {
 655                                         err = hwmon_thermal_add_sensor(dev,
 656                                                                 hwdev, j);
 657                                         if (err) {
 658                                                 device_unregister(hdev);
 659                                                 goto ida_remove;
 660                                         }
 661                                 }
 662                         }
 663                 }
 664         }
 665
 666         return hdev;
 667
 668 free_hwmon:
 669         kfree(hwdev);
 670 ida_remove:
 671         ida_simple_remove(&hwmon_ida, id);
 672         return ERR_PTR(err);
 673 }
 674
 675 /**
 676  * hwmon_device_register_with_groups - register w/ hwmon
 677  * @dev: the parent device
 678  * @name: hwmon name attribute
 679  * @drvdata: driver data to attach to created device
 680  * @groups: List of attribute groups to create
 681  *
 682  * hwmon_device_unregister() must be called when the device is no
 683  * longer needed.
 684  *
 685  * Returns the pointer to the new device.
 686  */
 687 struct device *
 688 hwmon_device_register_with_groups(struct device *dev, const char *name,
 689                                   void *drvdata,
 690                                   const struct attribute_group **groups)
 691 {
 692         if (!name)
 693                 return ERR_PTR(-EINVAL);
 694
 695         return __hwmon_device_register(dev, name, drvdata, NULL, groups);
 696 }
 697 EXPORT_SYMBOL_GPL(hwmon_device_register_with_groups);
 698
 699 /**
 700  * hwmon_device_register_with_info - register w/ hwmon
 701  * @dev: the parent device
 702  * @name: hwmon name attribute
 703  * @drvdata: driver data to attach to created device
 704  * @chip: pointer to hwmon chip information
 705  * @extra_groups: pointer to list of additional non-standard attribute groups
 706  *
 707  * hwmon_device_unregister() must be called when the device is no
 708  * longer needed.
 709  *
 710  * Returns the pointer to the new device.
 711  */
 712 struct device *
 713 hwmon_device_register_with_info(struct device *dev, const char *name,
 714                                 void *drvdata,
 715                                 const struct hwmon_chip_info *chip,
 716                                 const struct attribute_group **extra_groups)
 717 {
 718         if (!name)
 719                 return ERR_PTR(-EINVAL);
 720
 721         if (chip && (!chip->ops || !chip->ops->is_visible || !chip->info))
 722                 return ERR_PTR(-EINVAL);
 723
 724         if (chip && !dev)
 725                 return ERR_PTR(-EINVAL);
 726
 727         return __hwmon_device_register(dev, name, drvdata, chip, extra_groups);
 728 }
 729 EXPORT_SYMBOL_GPL(hwmon_device_register_with_info);
 730
 731 /**
 732  * hwmon_device_register - register w/ hwmon
 733  * @dev: the device to register
 734  *
 735  * hwmon_device_unregister() must be called when the device is no
 736  * longer needed.
 737  *
 738  * Returns the pointer to the new device.
 739  */
 740 struct device *hwmon_device_register(struct device *dev)
 741 {
 742         dev_warn(dev,
 743                  "hwmon_device_register() is deprecated. Please convert the driver to use hwmon_device_register_with_info().\n");
 744
 745         return __hwmon_device_register(dev, NULL, NULL, NULL, NULL);
 746 }
 747 EXPORT_SYMBOL_GPL(hwmon_device_register);
 748
 749 /**
 750  * hwmon_device_unregister - removes the previously registered class device
 751  *
 752  * @dev: the class device to destroy
 753  */
 754 void hwmon_device_unregister(struct device *dev)
 755 {
 756         int id;
 757
 758         if (likely(sscanf(dev_name(dev), HWMON_ID_FORMAT, &id) == 1)) {
 759                 device_unregister(dev);
 760                 ida_simple_remove(&hwmon_ida, id);
 761         } else
 762                 dev_dbg(dev->parent,
 763                         "hwmon_device_unregister() failed: bad class ID!\n");
 764 }
 765 EXPORT_SYMBOL_GPL(hwmon_device_unregister);
 766
 767 static void devm_hwmon_release(struct device *dev, void *res)
 768 {
 769         struct device *hwdev = *(struct device **)res;
 770
 771         hwmon_device_unregister(hwdev);
 772 }
 773
 774 /**
 775  * devm_hwmon_device_register_with_groups - register w/ hwmon
 776  * @dev: the parent device
 777  * @name: hwmon name attribute
 778  * @drvdata: driver data to attach to created device
 779  * @groups: List of attribute groups to create
 780  *
 781  * Returns the pointer to the new device. The new device is automatically
 782  * unregistered with the parent device.
 783  */
 784 struct device *
 785 devm_hwmon_device_register_with_groups(struct device *dev, const char *name,
 786                                        void *drvdata,
 787                                        const struct attribute_group **groups)
 788 {
 789         struct device **ptr, *hwdev;
 790
 791         if (!dev)
 792                 return ERR_PTR(-EINVAL);
 793
 794         ptr = devres_alloc(devm_hwmon_release, sizeof(*ptr), GFP_KERNEL);
 795         if (!ptr)
 796                 return ERR_PTR(-ENOMEM);
 797
 798         hwdev = hwmon_device_register_with_groups(dev, name, drvdata, groups);
 799         if (IS_ERR(hwdev))
 800                 goto error;
 801
 802         *ptr = hwdev;
 803         devres_add(dev, ptr);
 804         return hwdev;
 805
 806 error:
 807         devres_free(ptr);
 808         return hwdev;
 809 }
 810 EXPORT_SYMBOL_GPL(devm_hwmon_device_register_with_groups);
 811
 812 /**
 813  * devm_hwmon_device_register_with_info - register w/ hwmon
 814  * @dev:        the parent device
 815  * @name:       hwmon name attribute
 816  * @drvdata:    driver data to attach to created device
 817  * @chip:       pointer to hwmon chip information
 818  * @groups:     pointer to list of driver specific attribute groups
 819  *
 820  * Returns the pointer to the new device. The new device is automatically
 821  * unregistered with the parent device.
 822  */
 823 struct device *
 824 devm_hwmon_device_register_with_info(struct device *dev, const char *name,
 825                                      void *drvdata,
 826                                      const struct hwmon_chip_info *chip,
 827                                      const struct attribute_group **groups)
 828 {
 829         struct device **ptr, *hwdev;
 830
 831         if (!dev)
 832                 return ERR_PTR(-EINVAL);
 833
 834         ptr = devres_alloc(devm_hwmon_release, sizeof(*ptr), GFP_KERNEL);
 835         if (!ptr)
 836                 return ERR_PTR(-ENOMEM);
 837
 838         hwdev = hwmon_device_register_with_info(dev, name, drvdata, chip,
 839                                                 groups);
 840         if (IS_ERR(hwdev))
 841                 goto error;
 842
 843         *ptr = hwdev;
 844         devres_add(dev, ptr);
 845
 846         return hwdev;
 847
 848 error:
 849         devres_free(ptr);
 850         return hwdev;
 851 }
 852 EXPORT_SYMBOL_GPL(devm_hwmon_device_register_with_info);
 853
 854 static int devm_hwmon_match(struct device *dev, void *res, void *data)
 855 {
 856         struct device **hwdev = res;
 857
 858         return *hwdev == data;
 859 }
 860
 861 /**
 862  * devm_hwmon_device_unregister - removes a previously registered hwmon device
 863  *
 864  * @dev: the parent device of the device to unregister
 865  */
 866 void devm_hwmon_device_unregister(struct device *dev)
 867 {
 868         WARN_ON(devres_release(dev, devm_hwmon_release, devm_hwmon_match, dev));
 869 }
 870 EXPORT_SYMBOL_GPL(devm_hwmon_device_unregister);
 871
 872 static void __init hwmon_pci_quirks(void)
 873 {
 874 #if defined CONFIG_X86 && defined CONFIG_PCI
 875         struct pci_dev *sb;
 876         u16 base;
 877         u8 enable;
 878
 879         /* Open access to 0x295-0x296 on MSI MS-7031 */
 880         sb = pci_get_device(PCI_VENDOR_ID_ATI, 0x436c, NULL);
 881         if (sb) {
 882                 if (sb->subsystem_vendor == 0x1462 &&   /* MSI */
 883                     sb->subsystem_device == 0x0031) {   /* MS-7031 */
 884                         pci_read_config_byte(sb, 0x48, &enable);
 885                         pci_read_config_word(sb, 0x64, &base);
 886
 887                         if (base == 0 && !(enable & BIT(2))) {
 888                                 dev_info(&sb->dev,
 889                                          "Opening wide generic port at 0x295\n");
 890                                 pci_write_config_word(sb, 0x64, 0x295);
 891                                 pci_write_config_byte(sb, 0x48,
 892                                                       enable | BIT(2));
 893                         }
 894                 }
 895                 pci_dev_put(sb);
 896         }
 897 #endif
 898 }
 899
 900 static int __init hwmon_init(void)
 901 {
 902         int err;
 903
 904         hwmon_pci_quirks();
 905
 906         err = class_register(&hwmon_class);
 907         if (err) {
 908                 pr_err("couldn't register hwmon sysfs class\n");
 909                 return err;
 910         }
 911         return 0;
 912 }
 913
 914 static void __exit hwmon_exit(void)
 915 {
 916         class_unregister(&hwmon_class);
 917 }
 918
 919 subsys_initcall(hwmon_init);
 920 module_exit(hwmon_exit);
 921
 922 MODULE_AUTHOR("Mark M. Hoffman <mhoffman@lightlink.com>");
 923 MODULE_DESCRIPTION("hardware monitoring sysfs/class support");
 924 MODULE_LICENSE("GPL");
 925