drivers/hwmon/hwmon.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * hwmon.c - part of lm_sensors, Linux kernel modules for hardware monitoring
   4  *
   5  * This file defines the sysfs class "hwmon", for use by sensors drivers.
   6  *
   7  * Copyright (C) 2005 Mark M. Hoffman <mhoffman@lightlink.com>
   8  */
   9
  10 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  11
  12 #include <linux/bitops.h>
  13 #include <linux/device.h>
  14 #include <linux/err.h>
  15 #include <linux/gfp.h>
  16 #include <linux/hwmon.h>
  17 #include <linux/idr.h>
  18 #include <linux/list.h>
  19 #include <linux/module.h>
  20 #include <linux/pci.h>
  21 #include <linux/property.h>
  22 #include <linux/slab.h>
  23 #include <linux/string.h>
  24 #include <linux/thermal.h>
  25
  26 #define CREATE_TRACE_POINTS
  27 #include <trace/events/hwmon.h>
  28
  29 #define HWMON_ID_PREFIX "hwmon"
  30 #define HWMON_ID_FORMAT HWMON_ID_PREFIX "%d"
  31
  32 struct hwmon_device {
  33         const char *name;
  34         const char *label;
  35         struct device dev;
  36         const struct hwmon_chip_info *chip;
  37         struct list_head tzdata;
  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 #define to_dev_attr(a) container_of(a, struct device_attribute, attr)
  58
  59 /*
  60  * Thermal zone information
  61  */
  62 struct hwmon_thermal_data {
  63         struct list_head node;          /* hwmon tzdata list entry */
  64         struct device *dev;             /* Reference to hwmon device */
  65         int index;                      /* sensor index */
  66         struct thermal_zone_device *tzd;/* thermal zone device */
  67 };
  68
  69 static ssize_t
  70 name_show(struct device *dev, struct device_attribute *attr, char *buf)
  71 {
  72         return sprintf(buf, "%s\n", to_hwmon_device(dev)->name);
  73 }
  74 static DEVICE_ATTR_RO(name);
  75
  76 static ssize_t
  77 label_show(struct device *dev, struct device_attribute *attr, char *buf)
  78 {
  79         return sysfs_emit(buf, "%s\n", to_hwmon_device(dev)->label);
  80 }
  81 static DEVICE_ATTR_RO(label);
  82
  83 static struct attribute *hwmon_dev_attrs[] = {
  84         &dev_attr_name.attr,
  85         &dev_attr_label.attr,
  86         NULL
  87 };
  88
  89 static umode_t hwmon_dev_attr_is_visible(struct kobject *kobj,
  90                                          struct attribute *attr, int n)
  91 {
  92         struct device *dev = kobj_to_dev(kobj);
  93         struct hwmon_device *hdev = to_hwmon_device(dev);
  94
  95         if (attr == &dev_attr_name.attr && hdev->name == NULL)
  96                 return 0;
  97
  98         if (attr == &dev_attr_label.attr && hdev->label == NULL)
  99                 return 0;
 100
 101         return attr->mode;
 102 }
 103
 104 static const struct attribute_group hwmon_dev_attr_group = {
 105         .attrs          = hwmon_dev_attrs,
 106         .is_visible     = hwmon_dev_attr_is_visible,
 107 };
 108
 109 static const struct attribute_group *hwmon_dev_attr_groups[] = {
 110         &hwmon_dev_attr_group,
 111         NULL
 112 };
 113
 114 static void hwmon_free_attrs(struct attribute **attrs)
 115 {
 116         int i;
 117
 118         for (i = 0; attrs[i]; i++) {
 119                 struct device_attribute *dattr = to_dev_attr(attrs[i]);
 120                 struct hwmon_device_attribute *hattr = to_hwmon_attr(dattr);
 121
 122                 kfree(hattr);
 123         }
 124         kfree(attrs);
 125 }
 126
 127 static void hwmon_dev_release(struct device *dev)
 128 {
 129         struct hwmon_device *hwdev = to_hwmon_device(dev);
 130
 131         if (hwdev->group.attrs)
 132                 hwmon_free_attrs(hwdev->group.attrs);
 133         kfree(hwdev->groups);
 134         kfree(hwdev->label);
 135         kfree(hwdev);
 136 }
 137
 138 static struct class hwmon_class = {
 139         .name = "hwmon",
 140         .owner = THIS_MODULE,
 141         .dev_groups = hwmon_dev_attr_groups,
 142         .dev_release = hwmon_dev_release,
 143 };
 144
 145 static DEFINE_IDA(hwmon_ida);
 146
 147 /* Thermal zone handling */
 148
 149 /*
 150  * The complex conditional is necessary to avoid a cyclic dependency
 151  * between hwmon and thermal_sys modules.
 152  */
 153 #ifdef CONFIG_THERMAL_OF
 154 static int hwmon_thermal_get_temp(struct thermal_zone_device *tz, int *temp)
 155 {
 156         struct hwmon_thermal_data *tdata = tz->devdata;
 157         struct hwmon_device *hwdev = to_hwmon_device(tdata->dev);
 158         int ret;
 159         long t;
 160
 161         ret = hwdev->chip->ops->read(tdata->dev, hwmon_temp, hwmon_temp_input,
 162                                      tdata->index, &t);
 163         if (ret < 0)
 164                 return ret;
 165
 166         *temp = t;
 167
 168         return 0;
 169 }
 170
 171 static int hwmon_thermal_set_trips(struct thermal_zone_device *tz, int low, int high)
 172 {
 173         struct hwmon_thermal_data *tdata = tz->devdata;
 174         struct hwmon_device *hwdev = to_hwmon_device(tdata->dev);
 175         const struct hwmon_chip_info *chip = hwdev->chip;
 176         const struct hwmon_channel_info **info = chip->info;
 177         unsigned int i;
 178         int err;
 179
 180         if (!chip->ops->write)
 181                 return 0;
 182
 183         for (i = 0; info[i] && info[i]->type != hwmon_temp; i++)
 184                 continue;
 185
 186         if (!info[i])
 187                 return 0;
 188
 189         if (info[i]->config[tdata->index] & HWMON_T_MIN) {
 190                 err = chip->ops->write(tdata->dev, hwmon_temp,
 191                                        hwmon_temp_min, tdata->index, low);
 192                 if (err && err != -EOPNOTSUPP)
 193                         return err;
 194         }
 195
 196         if (info[i]->config[tdata->index] & HWMON_T_MAX) {
 197                 err = chip->ops->write(tdata->dev, hwmon_temp,
 198                                        hwmon_temp_max, tdata->index, high);
 199                 if (err && err != -EOPNOTSUPP)
 200                         return err;
 201         }
 202
 203         return 0;
 204 }
 205
 206 static const struct thermal_zone_device_ops hwmon_thermal_ops = {
 207         .get_temp = hwmon_thermal_get_temp,
 208         .set_trips = hwmon_thermal_set_trips,
 209 };
 210
 211 static void hwmon_thermal_remove_sensor(void *data)
 212 {
 213         list_del(data);
 214 }
 215
 216 static int hwmon_thermal_add_sensor(struct device *dev, int index)
 217 {
 218         struct hwmon_device *hwdev = to_hwmon_device(dev);
 219         struct hwmon_thermal_data *tdata;
 220         struct thermal_zone_device *tzd;
 221         int err;
 222
 223         tdata = devm_kzalloc(dev, sizeof(*tdata), GFP_KERNEL);
 224         if (!tdata)
 225                 return -ENOMEM;
 226
 227         tdata->dev = dev;
 228         tdata->index = index;
 229
 230         tzd = devm_thermal_of_zone_register(dev, index, tdata,
 231                                             &hwmon_thermal_ops);
 232         if (IS_ERR(tzd)) {
 233                 if (PTR_ERR(tzd) != -ENODEV)
 234                         return PTR_ERR(tzd);
 235                 dev_info(dev, "temp%d_input not attached to any thermal zone\n",
 236                          index + 1);
 237                 devm_kfree(dev, tdata);
 238                 return 0;
 239         }
 240
 241         err = devm_add_action(dev, hwmon_thermal_remove_sensor, &tdata->node);
 242         if (err)
 243                 return err;
 244
 245         tdata->tzd = tzd;
 246         list_add(&tdata->node, &hwdev->tzdata);
 247
 248         return 0;
 249 }
 250
 251 static int hwmon_thermal_register_sensors(struct device *dev)
 252 {
 253         struct hwmon_device *hwdev = to_hwmon_device(dev);
 254         const struct hwmon_chip_info *chip = hwdev->chip;
 255         const struct hwmon_channel_info **info = chip->info;
 256         void *drvdata = dev_get_drvdata(dev);
 257         int i;
 258
 259         for (i = 1; info[i]; i++) {
 260                 int j;
 261
 262                 if (info[i]->type != hwmon_temp)
 263                         continue;
 264
 265                 for (j = 0; info[i]->config[j]; j++) {
 266                         int err;
 267
 268                         if (!(info[i]->config[j] & HWMON_T_INPUT) ||
 269                             !chip->ops->is_visible(drvdata, hwmon_temp,
 270                                                    hwmon_temp_input, j))
 271                                 continue;
 272
 273                         err = hwmon_thermal_add_sensor(dev, j);
 274                         if (err)
 275                                 return err;
 276                 }
 277         }
 278
 279         return 0;
 280 }
 281
 282 static void hwmon_thermal_notify(struct device *dev, int index)
 283 {
 284         struct hwmon_device *hwdev = to_hwmon_device(dev);
 285         struct hwmon_thermal_data *tzdata;
 286
 287         list_for_each_entry(tzdata, &hwdev->tzdata, node) {
 288                 if (tzdata->index == index) {
 289                         thermal_zone_device_update(tzdata->tzd,
 290                                                    THERMAL_EVENT_UNSPECIFIED);
 291                 }
 292         }
 293 }
 294
 295 #else
 296 static int hwmon_thermal_register_sensors(struct device *dev)
 297 {
 298         return 0;
 299 }
 300
 301 static void hwmon_thermal_notify(struct device *dev, int index) { }
 302
 303 #endif /* IS_REACHABLE(CONFIG_THERMAL) && ... */
 304
 305 static int hwmon_attr_base(enum hwmon_sensor_types type)
 306 {
 307         if (type == hwmon_in || type == hwmon_intrusion)
 308                 return 0;
 309         return 1;
 310 }
 311
 312 /* sysfs attribute management */
 313
 314 static ssize_t hwmon_attr_show(struct device *dev,
 315                                struct device_attribute *devattr, char *buf)
 316 {
 317         struct hwmon_device_attribute *hattr = to_hwmon_attr(devattr);
 318         long val;
 319         int ret;
 320
 321         ret = hattr->ops->read(dev, hattr->type, hattr->attr, hattr->index,
 322                                &val);
 323         if (ret < 0)
 324                 return ret;
 325
 326         trace_hwmon_attr_show(hattr->index + hwmon_attr_base(hattr->type),
 327                               hattr->name, val);
 328
 329         return sprintf(buf, "%ld\n", val);
 330 }
 331
 332 static ssize_t hwmon_attr_show_string(struct device *dev,
 333                                       struct device_attribute *devattr,
 334                                       char *buf)
 335 {
 336         struct hwmon_device_attribute *hattr = to_hwmon_attr(devattr);
 337         enum hwmon_sensor_types type = hattr->type;
 338         const char *s;
 339         int ret;
 340
 341         ret = hattr->ops->read_string(dev, hattr->type, hattr->attr,
 342                                       hattr->index, &s);
 343         if (ret < 0)
 344                 return ret;
 345
 346         trace_hwmon_attr_show_string(hattr->index + hwmon_attr_base(type),
 347                                      hattr->name, s);
 348
 349         return sprintf(buf, "%s\n", s);
 350 }
 351
 352 static ssize_t hwmon_attr_store(struct device *dev,
 353                                 struct device_attribute *devattr,
 354                                 const char *buf, size_t count)
 355 {
 356         struct hwmon_device_attribute *hattr = to_hwmon_attr(devattr);
 357         long val;
 358         int ret;
 359
 360         ret = kstrtol(buf, 10, &val);
 361         if (ret < 0)
 362                 return ret;
 363
 364         ret = hattr->ops->write(dev, hattr->type, hattr->attr, hattr->index,
 365                                 val);
 366         if (ret < 0)
 367                 return ret;
 368
 369         trace_hwmon_attr_store(hattr->index + hwmon_attr_base(hattr->type),
 370                                hattr->name, val);
 371
 372         return count;
 373 }
 374
 375 static bool is_string_attr(enum hwmon_sensor_types type, u32 attr)
 376 {
 377         return (type == hwmon_temp && attr == hwmon_temp_label) ||
 378                (type == hwmon_in && attr == hwmon_in_label) ||
 379                (type == hwmon_curr && attr == hwmon_curr_label) ||
 380                (type == hwmon_power && attr == hwmon_power_label) ||
 381                (type == hwmon_energy && attr == hwmon_energy_label) ||
 382                (type == hwmon_humidity && attr == hwmon_humidity_label) ||
 383                (type == hwmon_fan && attr == hwmon_fan_label);
 384 }
 385
 386 static struct attribute *hwmon_genattr(const void *drvdata,
 387                                        enum hwmon_sensor_types type,
 388                                        u32 attr,
 389                                        int index,
 390                                        const char *template,
 391                                        const struct hwmon_ops *ops)
 392 {
 393         struct hwmon_device_attribute *hattr;
 394         struct device_attribute *dattr;
 395         struct attribute *a;
 396         umode_t mode;
 397         const char *name;
 398         bool is_string = is_string_attr(type, attr);
 399
 400         /* The attribute is invisible if there is no template string */
 401         if (!template)
 402                 return ERR_PTR(-ENOENT);
 403
 404         mode = ops->is_visible(drvdata, type, attr, index);
 405         if (!mode)
 406                 return ERR_PTR(-ENOENT);
 407
 408         if ((mode & 0444) && ((is_string && !ops->read_string) ||
 409                                  (!is_string && !ops->read)))
 410                 return ERR_PTR(-EINVAL);
 411         if ((mode & 0222) && !ops->write)
 412                 return ERR_PTR(-EINVAL);
 413
 414         hattr = kzalloc(sizeof(*hattr), GFP_KERNEL);
 415         if (!hattr)
 416                 return ERR_PTR(-ENOMEM);
 417
 418         if (type == hwmon_chip) {
 419                 name = template;
 420         } else {
 421                 scnprintf(hattr->name, sizeof(hattr->name), template,
 422                           index + hwmon_attr_base(type));
 423                 name = hattr->name;
 424         }
 425
 426         hattr->type = type;
 427         hattr->attr = attr;
 428         hattr->index = index;
 429         hattr->ops = ops;
 430
 431         dattr = &hattr->dev_attr;
 432         dattr->show = is_string ? hwmon_attr_show_string : hwmon_attr_show;
 433         dattr->store = hwmon_attr_store;
 434
 435         a = &dattr->attr;
 436         sysfs_attr_init(a);
 437         a->name = name;
 438         a->mode = mode;
 439
 440         return a;
 441 }
 442
 443 /*
 444  * Chip attributes are not attribute templates but actual sysfs attributes.
 445  * See hwmon_genattr() for special handling.
 446  */
 447 static const char * const hwmon_chip_attrs[] = {
 448         [hwmon_chip_temp_reset_history] = "temp_reset_history",
 449         [hwmon_chip_in_reset_history] = "in_reset_history",
 450         [hwmon_chip_curr_reset_history] = "curr_reset_history",
 451         [hwmon_chip_power_reset_history] = "power_reset_history",
 452         [hwmon_chip_update_interval] = "update_interval",
 453         [hwmon_chip_alarms] = "alarms",
 454         [hwmon_chip_samples] = "samples",
 455         [hwmon_chip_curr_samples] = "curr_samples",
 456         [hwmon_chip_in_samples] = "in_samples",
 457         [hwmon_chip_power_samples] = "power_samples",
 458         [hwmon_chip_temp_samples] = "temp_samples",
 459 };
 460
 461 static const char * const hwmon_temp_attr_templates[] = {
 462         [hwmon_temp_enable] = "temp%d_enable",
 463         [hwmon_temp_input] = "temp%d_input",
 464         [hwmon_temp_type] = "temp%d_type",
 465         [hwmon_temp_lcrit] = "temp%d_lcrit",
 466         [hwmon_temp_lcrit_hyst] = "temp%d_lcrit_hyst",
 467         [hwmon_temp_min] = "temp%d_min",
 468         [hwmon_temp_min_hyst] = "temp%d_min_hyst",
 469         [hwmon_temp_max] = "temp%d_max",
 470         [hwmon_temp_max_hyst] = "temp%d_max_hyst",
 471         [hwmon_temp_crit] = "temp%d_crit",
 472         [hwmon_temp_crit_hyst] = "temp%d_crit_hyst",
 473         [hwmon_temp_emergency] = "temp%d_emergency",
 474         [hwmon_temp_emergency_hyst] = "temp%d_emergency_hyst",
 475         [hwmon_temp_alarm] = "temp%d_alarm",
 476         [hwmon_temp_lcrit_alarm] = "temp%d_lcrit_alarm",
 477         [hwmon_temp_min_alarm] = "temp%d_min_alarm",
 478         [hwmon_temp_max_alarm] = "temp%d_max_alarm",
 479         [hwmon_temp_crit_alarm] = "temp%d_crit_alarm",
 480         [hwmon_temp_emergency_alarm] = "temp%d_emergency_alarm",
 481         [hwmon_temp_fault] = "temp%d_fault",
 482         [hwmon_temp_offset] = "temp%d_offset",
 483         [hwmon_temp_label] = "temp%d_label",
 484         [hwmon_temp_lowest] = "temp%d_lowest",
 485         [hwmon_temp_highest] = "temp%d_highest",
 486         [hwmon_temp_reset_history] = "temp%d_reset_history",
 487         [hwmon_temp_rated_min] = "temp%d_rated_min",
 488         [hwmon_temp_rated_max] = "temp%d_rated_max",
 489 };
 490
 491 static const char * const hwmon_in_attr_templates[] = {
 492         [hwmon_in_enable] = "in%d_enable",
 493         [hwmon_in_input] = "in%d_input",
 494         [hwmon_in_min] = "in%d_min",
 495         [hwmon_in_max] = "in%d_max",
 496         [hwmon_in_lcrit] = "in%d_lcrit",
 497         [hwmon_in_crit] = "in%d_crit",
 498         [hwmon_in_average] = "in%d_average",
 499         [hwmon_in_lowest] = "in%d_lowest",
 500         [hwmon_in_highest] = "in%d_highest",
 501         [hwmon_in_reset_history] = "in%d_reset_history",
 502         [hwmon_in_label] = "in%d_label",
 503         [hwmon_in_alarm] = "in%d_alarm",
 504         [hwmon_in_min_alarm] = "in%d_min_alarm",
 505         [hwmon_in_max_alarm] = "in%d_max_alarm",
 506         [hwmon_in_lcrit_alarm] = "in%d_lcrit_alarm",
 507         [hwmon_in_crit_alarm] = "in%d_crit_alarm",
 508         [hwmon_in_rated_min] = "in%d_rated_min",
 509         [hwmon_in_rated_max] = "in%d_rated_max",
 510 };
 511
 512 static const char * const hwmon_curr_attr_templates[] = {
 513         [hwmon_curr_enable] = "curr%d_enable",
 514         [hwmon_curr_input] = "curr%d_input",
 515         [hwmon_curr_min] = "curr%d_min",
 516         [hwmon_curr_max] = "curr%d_max",
 517         [hwmon_curr_lcrit] = "curr%d_lcrit",
 518         [hwmon_curr_crit] = "curr%d_crit",
 519         [hwmon_curr_average] = "curr%d_average",
 520         [hwmon_curr_lowest] = "curr%d_lowest",
 521         [hwmon_curr_highest] = "curr%d_highest",
 522         [hwmon_curr_reset_history] = "curr%d_reset_history",
 523         [hwmon_curr_label] = "curr%d_label",
 524         [hwmon_curr_alarm] = "curr%d_alarm",
 525         [hwmon_curr_min_alarm] = "curr%d_min_alarm",
 526         [hwmon_curr_max_alarm] = "curr%d_max_alarm",
 527         [hwmon_curr_lcrit_alarm] = "curr%d_lcrit_alarm",
 528         [hwmon_curr_crit_alarm] = "curr%d_crit_alarm",
 529         [hwmon_curr_rated_min] = "curr%d_rated_min",
 530         [hwmon_curr_rated_max] = "curr%d_rated_max",
 531 };
 532
 533 static const char * const hwmon_power_attr_templates[] = {
 534         [hwmon_power_enable] = "power%d_enable",
 535         [hwmon_power_average] = "power%d_average",
 536         [hwmon_power_average_interval] = "power%d_average_interval",
 537         [hwmon_power_average_interval_max] = "power%d_interval_max",
 538         [hwmon_power_average_interval_min] = "power%d_interval_min",
 539         [hwmon_power_average_highest] = "power%d_average_highest",
 540         [hwmon_power_average_lowest] = "power%d_average_lowest",
 541         [hwmon_power_average_max] = "power%d_average_max",
 542         [hwmon_power_average_min] = "power%d_average_min",
 543         [hwmon_power_input] = "power%d_input",
 544         [hwmon_power_input_highest] = "power%d_input_highest",
 545         [hwmon_power_input_lowest] = "power%d_input_lowest",
 546         [hwmon_power_reset_history] = "power%d_reset_history",
 547         [hwmon_power_accuracy] = "power%d_accuracy",
 548         [hwmon_power_cap] = "power%d_cap",
 549         [hwmon_power_cap_hyst] = "power%d_cap_hyst",
 550         [hwmon_power_cap_max] = "power%d_cap_max",
 551         [hwmon_power_cap_min] = "power%d_cap_min",
 552         [hwmon_power_min] = "power%d_min",
 553         [hwmon_power_max] = "power%d_max",
 554         [hwmon_power_lcrit] = "power%d_lcrit",
 555         [hwmon_power_crit] = "power%d_crit",
 556         [hwmon_power_label] = "power%d_label",
 557         [hwmon_power_alarm] = "power%d_alarm",
 558         [hwmon_power_cap_alarm] = "power%d_cap_alarm",
 559         [hwmon_power_min_alarm] = "power%d_min_alarm",
 560         [hwmon_power_max_alarm] = "power%d_max_alarm",
 561         [hwmon_power_lcrit_alarm] = "power%d_lcrit_alarm",
 562         [hwmon_power_crit_alarm] = "power%d_crit_alarm",
 563         [hwmon_power_rated_min] = "power%d_rated_min",
 564         [hwmon_power_rated_max] = "power%d_rated_max",
 565 };
 566
 567 static const char * const hwmon_energy_attr_templates[] = {
 568         [hwmon_energy_enable] = "energy%d_enable",
 569         [hwmon_energy_input] = "energy%d_input",
 570         [hwmon_energy_label] = "energy%d_label",
 571 };
 572
 573 static const char * const hwmon_humidity_attr_templates[] = {
 574         [hwmon_humidity_enable] = "humidity%d_enable",
 575         [hwmon_humidity_input] = "humidity%d_input",
 576         [hwmon_humidity_label] = "humidity%d_label",
 577         [hwmon_humidity_min] = "humidity%d_min",
 578         [hwmon_humidity_min_hyst] = "humidity%d_min_hyst",
 579         [hwmon_humidity_max] = "humidity%d_max",
 580         [hwmon_humidity_max_hyst] = "humidity%d_max_hyst",
 581         [hwmon_humidity_alarm] = "humidity%d_alarm",
 582         [hwmon_humidity_fault] = "humidity%d_fault",
 583         [hwmon_humidity_rated_min] = "humidity%d_rated_min",
 584         [hwmon_humidity_rated_max] = "humidity%d_rated_max",
 585 };
 586
 587 static const char * const hwmon_fan_attr_templates[] = {
 588         [hwmon_fan_enable] = "fan%d_enable",
 589         [hwmon_fan_input] = "fan%d_input",
 590         [hwmon_fan_label] = "fan%d_label",
 591         [hwmon_fan_min] = "fan%d_min",
 592         [hwmon_fan_max] = "fan%d_max",
 593         [hwmon_fan_div] = "fan%d_div",
 594         [hwmon_fan_pulses] = "fan%d_pulses",
 595         [hwmon_fan_target] = "fan%d_target",
 596         [hwmon_fan_alarm] = "fan%d_alarm",
 597         [hwmon_fan_min_alarm] = "fan%d_min_alarm",
 598         [hwmon_fan_max_alarm] = "fan%d_max_alarm",
 599         [hwmon_fan_fault] = "fan%d_fault",
 600 };
 601
 602 static const char * const hwmon_pwm_attr_templates[] = {
 603         [hwmon_pwm_input] = "pwm%d",
 604         [hwmon_pwm_enable] = "pwm%d_enable",
 605         [hwmon_pwm_mode] = "pwm%d_mode",
 606         [hwmon_pwm_freq] = "pwm%d_freq",
 607         [hwmon_pwm_auto_channels_temp] = "pwm%d_auto_channels_temp",
 608 };
 609
 610 static const char * const hwmon_intrusion_attr_templates[] = {
 611         [hwmon_intrusion_alarm] = "intrusion%d_alarm",
 612         [hwmon_intrusion_beep]  = "intrusion%d_beep",
 613 };
 614
 615 static const char * const *__templates[] = {
 616         [hwmon_chip] = hwmon_chip_attrs,
 617         [hwmon_temp] = hwmon_temp_attr_templates,
 618         [hwmon_in] = hwmon_in_attr_templates,
 619         [hwmon_curr] = hwmon_curr_attr_templates,
 620         [hwmon_power] = hwmon_power_attr_templates,
 621         [hwmon_energy] = hwmon_energy_attr_templates,
 622         [hwmon_humidity] = hwmon_humidity_attr_templates,
 623         [hwmon_fan] = hwmon_fan_attr_templates,
 624         [hwmon_pwm] = hwmon_pwm_attr_templates,
 625         [hwmon_intrusion] = hwmon_intrusion_attr_templates,
 626 };
 627
 628 static const int __templates_size[] = {
 629         [hwmon_chip] = ARRAY_SIZE(hwmon_chip_attrs),
 630         [hwmon_temp] = ARRAY_SIZE(hwmon_temp_attr_templates),
 631         [hwmon_in] = ARRAY_SIZE(hwmon_in_attr_templates),
 632         [hwmon_curr] = ARRAY_SIZE(hwmon_curr_attr_templates),
 633         [hwmon_power] = ARRAY_SIZE(hwmon_power_attr_templates),
 634         [hwmon_energy] = ARRAY_SIZE(hwmon_energy_attr_templates),
 635         [hwmon_humidity] = ARRAY_SIZE(hwmon_humidity_attr_templates),
 636         [hwmon_fan] = ARRAY_SIZE(hwmon_fan_attr_templates),
 637         [hwmon_pwm] = ARRAY_SIZE(hwmon_pwm_attr_templates),
 638         [hwmon_intrusion] = ARRAY_SIZE(hwmon_intrusion_attr_templates),
 639 };
 640
 641 int hwmon_notify_event(struct device *dev, enum hwmon_sensor_types type,
 642                        u32 attr, int channel)
 643 {
 644         char event[MAX_SYSFS_ATTR_NAME_LENGTH + 5];
 645         char sattr[MAX_SYSFS_ATTR_NAME_LENGTH];
 646         char *envp[] = { event, NULL };
 647         const char * const *templates;
 648         const char *template;
 649         int base;
 650
 651         if (type >= ARRAY_SIZE(__templates))
 652                 return -EINVAL;
 653         if (attr >= __templates_size[type])
 654                 return -EINVAL;
 655
 656         templates = __templates[type];
 657         template = templates[attr];
 658
 659         base = hwmon_attr_base(type);
 660
 661         scnprintf(sattr, MAX_SYSFS_ATTR_NAME_LENGTH, template, base + channel);
 662         scnprintf(event, sizeof(event), "NAME=%s", sattr);
 663         sysfs_notify(&dev->kobj, NULL, sattr);
 664         kobject_uevent_env(&dev->kobj, KOBJ_CHANGE, envp);
 665
 666         if (type == hwmon_temp)
 667                 hwmon_thermal_notify(dev, channel);
 668
 669         return 0;
 670 }
 671 EXPORT_SYMBOL_GPL(hwmon_notify_event);
 672
 673 static int hwmon_num_channel_attrs(const struct hwmon_channel_info *info)
 674 {
 675         int i, n;
 676
 677         for (i = n = 0; info->config[i]; i++)
 678                 n += hweight32(info->config[i]);
 679
 680         return n;
 681 }
 682
 683 static int hwmon_genattrs(const void *drvdata,
 684                           struct attribute **attrs,
 685                           const struct hwmon_ops *ops,
 686                           const struct hwmon_channel_info *info)
 687 {
 688         const char * const *templates;
 689         int template_size;
 690         int i, aindex = 0;
 691
 692         if (info->type >= ARRAY_SIZE(__templates))
 693                 return -EINVAL;
 694
 695         templates = __templates[info->type];
 696         template_size = __templates_size[info->type];
 697
 698         for (i = 0; info->config[i]; i++) {
 699                 u32 attr_mask = info->config[i];
 700                 u32 attr;
 701
 702                 while (attr_mask) {
 703                         struct attribute *a;
 704
 705                         attr = __ffs(attr_mask);
 706                         attr_mask &= ~BIT(attr);
 707                         if (attr >= template_size)
 708                                 return -EINVAL;
 709                         a = hwmon_genattr(drvdata, info->type, attr, i,
 710                                           templates[attr], ops);
 711                         if (IS_ERR(a)) {
 712                                 if (PTR_ERR(a) != -ENOENT)
 713                                         return PTR_ERR(a);
 714                                 continue;
 715                         }
 716                         attrs[aindex++] = a;
 717                 }
 718         }
 719         return aindex;
 720 }
 721
 722 static struct attribute **
 723 __hwmon_create_attrs(const void *drvdata, const struct hwmon_chip_info *chip)
 724 {
 725         int ret, i, aindex = 0, nattrs = 0;
 726         struct attribute **attrs;
 727
 728         for (i = 0; chip->info[i]; i++)
 729                 nattrs += hwmon_num_channel_attrs(chip->info[i]);
 730
 731         if (nattrs == 0)
 732                 return ERR_PTR(-EINVAL);
 733
 734         attrs = kcalloc(nattrs + 1, sizeof(*attrs), GFP_KERNEL);
 735         if (!attrs)
 736                 return ERR_PTR(-ENOMEM);
 737
 738         for (i = 0; chip->info[i]; i++) {
 739                 ret = hwmon_genattrs(drvdata, &attrs[aindex], chip->ops,
 740                                      chip->info[i]);
 741                 if (ret < 0) {
 742                         hwmon_free_attrs(attrs);
 743                         return ERR_PTR(ret);
 744                 }
 745                 aindex += ret;
 746         }
 747
 748         return attrs;
 749 }
 750
 751 static struct device *
 752 __hwmon_device_register(struct device *dev, const char *name, void *drvdata,
 753                         const struct hwmon_chip_info *chip,
 754                         const struct attribute_group **groups)
 755 {
 756         struct hwmon_device *hwdev;
 757         const char *label;
 758         struct device *hdev;
 759         int i, err, id;
 760
 761         /* Complain about invalid characters in hwmon name attribute */
 762         if (name && (!strlen(name) || strpbrk(name, "-* \t\n")))
 763                 dev_warn(dev,
 764                          "hwmon: '%s' is not a valid name attribute, please fix\n",
 765                          name);
 766
 767         id = ida_alloc(&hwmon_ida, GFP_KERNEL);
 768         if (id < 0)
 769                 return ERR_PTR(id);
 770
 771         hwdev = kzalloc(sizeof(*hwdev), GFP_KERNEL);
 772         if (hwdev == NULL) {
 773                 err = -ENOMEM;
 774                 goto ida_remove;
 775         }
 776
 777         hdev = &hwdev->dev;
 778
 779         if (chip) {
 780                 struct attribute **attrs;
 781                 int ngroups = 2; /* terminating NULL plus &hwdev->groups */
 782
 783                 if (groups)
 784                         for (i = 0; groups[i]; i++)
 785                                 ngroups++;
 786
 787                 hwdev->groups = kcalloc(ngroups, sizeof(*groups), GFP_KERNEL);
 788                 if (!hwdev->groups) {
 789                         err = -ENOMEM;
 790                         goto free_hwmon;
 791                 }
 792
 793                 attrs = __hwmon_create_attrs(drvdata, chip);
 794                 if (IS_ERR(attrs)) {
 795                         err = PTR_ERR(attrs);
 796                         goto free_hwmon;
 797                 }
 798
 799                 hwdev->group.attrs = attrs;
 800                 ngroups = 0;
 801                 hwdev->groups[ngroups++] = &hwdev->group;
 802
 803                 if (groups) {
 804                         for (i = 0; groups[i]; i++)
 805                                 hwdev->groups[ngroups++] = groups[i];
 806                 }
 807
 808                 hdev->groups = hwdev->groups;
 809         } else {
 810                 hdev->groups = groups;
 811         }
 812
 813         if (dev && device_property_present(dev, "label")) {
 814                 err = device_property_read_string(dev, "label", &label);
 815                 if (err < 0)
 816                         goto free_hwmon;
 817
 818                 hwdev->label = kstrdup(label, GFP_KERNEL);
 819                 if (hwdev->label == NULL) {
 820                         err = -ENOMEM;
 821                         goto free_hwmon;
 822                 }
 823         }
 824
 825         hwdev->name = name;
 826         hdev->class = &hwmon_class;
 827         hdev->parent = dev;
 828         hdev->of_node = dev ? dev->of_node : NULL;
 829         hwdev->chip = chip;
 830         dev_set_drvdata(hdev, drvdata);
 831         dev_set_name(hdev, HWMON_ID_FORMAT, id);
 832         err = device_register(hdev);
 833         if (err) {
 834                 put_device(hdev);
 835                 goto ida_remove;
 836         }
 837
 838         INIT_LIST_HEAD(&hwdev->tzdata);
 839
 840         if (dev && dev->of_node && chip && chip->ops->read &&
 841             chip->info[0]->type == hwmon_chip &&
 842             (chip->info[0]->config[0] & HWMON_C_REGISTER_TZ)) {
 843                 err = hwmon_thermal_register_sensors(hdev);
 844                 if (err) {
 845                         device_unregister(hdev);
 846                         /*
 847                          * Don't worry about hwdev; hwmon_dev_release(), called
 848                          * from device_unregister(), will free it.
 849                          */
 850                         goto ida_remove;
 851                 }
 852         }
 853
 854         return hdev;
 855
 856 free_hwmon:
 857         hwmon_dev_release(hdev);
 858 ida_remove:
 859         ida_free(&hwmon_ida, id);
 860         return ERR_PTR(err);
 861 }
 862
 863 /**
 864  * hwmon_device_register_with_groups - register w/ hwmon
 865  * @dev: the parent device
 866  * @name: hwmon name attribute
 867  * @drvdata: driver data to attach to created device
 868  * @groups: List of attribute groups to create
 869  *
 870  * hwmon_device_unregister() must be called when the device is no
 871  * longer needed.
 872  *
 873  * Returns the pointer to the new device.
 874  */
 875 struct device *
 876 hwmon_device_register_with_groups(struct device *dev, const char *name,
 877                                   void *drvdata,
 878                                   const struct attribute_group **groups)
 879 {
 880         if (!name)
 881                 return ERR_PTR(-EINVAL);
 882
 883         return __hwmon_device_register(dev, name, drvdata, NULL, groups);
 884 }
 885 EXPORT_SYMBOL_GPL(hwmon_device_register_with_groups);
 886
 887 /**
 888  * hwmon_device_register_with_info - register w/ hwmon
 889  * @dev: the parent device (mandatory)
 890  * @name: hwmon name attribute (mandatory)
 891  * @drvdata: driver data to attach to created device (optional)
 892  * @chip: pointer to hwmon chip information (mandatory)
 893  * @extra_groups: pointer to list of additional non-standard attribute groups
 894  *      (optional)
 895  *
 896  * hwmon_device_unregister() must be called when the device is no
 897  * longer needed.
 898  *
 899  * Returns the pointer to the new device.
 900  */
 901 struct device *
 902 hwmon_device_register_with_info(struct device *dev, const char *name,
 903                                 void *drvdata,
 904                                 const struct hwmon_chip_info *chip,
 905                                 const struct attribute_group **extra_groups)
 906 {
 907         if (!dev || !name || !chip)
 908                 return ERR_PTR(-EINVAL);
 909
 910         if (!chip->ops || !chip->ops->is_visible || !chip->info)
 911                 return ERR_PTR(-EINVAL);
 912
 913         return __hwmon_device_register(dev, name, drvdata, chip, extra_groups);
 914 }
 915 EXPORT_SYMBOL_GPL(hwmon_device_register_with_info);
 916
 917 /**
 918  * hwmon_device_register_for_thermal - register hwmon device for thermal subsystem
 919  * @dev: the parent device
 920  * @name: hwmon name attribute
 921  * @drvdata: driver data to attach to created device
 922  *
 923  * The use of this function is restricted. It is provided for legacy reasons
 924  * and must only be called from the thermal subsystem.
 925  *
 926  * hwmon_device_unregister() must be called when the device is no
 927  * longer needed.
 928  *
 929  * Returns the pointer to the new device.
 930  */
 931 struct device *
 932 hwmon_device_register_for_thermal(struct device *dev, const char *name,
 933                                   void *drvdata)
 934 {
 935         if (!name || !dev)
 936                 return ERR_PTR(-EINVAL);
 937
 938         return __hwmon_device_register(dev, name, drvdata, NULL, NULL);
 939 }
 940 EXPORT_SYMBOL_NS_GPL(hwmon_device_register_for_thermal, HWMON_THERMAL);
 941
 942 /**
 943  * hwmon_device_register - register w/ hwmon
 944  * @dev: the device to register
 945  *
 946  * hwmon_device_unregister() must be called when the device is no
 947  * longer needed.
 948  *
 949  * Returns the pointer to the new device.
 950  */
 951 struct device *hwmon_device_register(struct device *dev)
 952 {
 953         dev_warn(dev,
 954                  "hwmon_device_register() is deprecated. Please convert the driver to use hwmon_device_register_with_info().\n");
 955
 956         return __hwmon_device_register(dev, NULL, NULL, NULL, NULL);
 957 }
 958 EXPORT_SYMBOL_GPL(hwmon_device_register);
 959
 960 /**
 961  * hwmon_device_unregister - removes the previously registered class device
 962  *
 963  * @dev: the class device to destroy
 964  */
 965 void hwmon_device_unregister(struct device *dev)
 966 {
 967         int id;
 968
 969         if (likely(sscanf(dev_name(dev), HWMON_ID_FORMAT, &id) == 1)) {
 970                 device_unregister(dev);
 971                 ida_free(&hwmon_ida, id);
 972         } else
 973                 dev_dbg(dev->parent,
 974                         "hwmon_device_unregister() failed: bad class ID!\n");
 975 }
 976 EXPORT_SYMBOL_GPL(hwmon_device_unregister);
 977
 978 static void devm_hwmon_release(struct device *dev, void *res)
 979 {
 980         struct device *hwdev = *(struct device **)res;
 981
 982         hwmon_device_unregister(hwdev);
 983 }
 984
 985 /**
 986  * devm_hwmon_device_register_with_groups - register w/ hwmon
 987  * @dev: the parent device
 988  * @name: hwmon name attribute
 989  * @drvdata: driver data to attach to created device
 990  * @groups: List of attribute groups to create
 991  *
 992  * Returns the pointer to the new device. The new device is automatically
 993  * unregistered with the parent device.
 994  */
 995 struct device *
 996 devm_hwmon_device_register_with_groups(struct device *dev, const char *name,
 997                                        void *drvdata,
 998                                        const struct attribute_group **groups)
 999 {
1000         struct device **ptr, *hwdev;
1001
1002         if (!dev)
1003                 return ERR_PTR(-EINVAL);
1004
1005         ptr = devres_alloc(devm_hwmon_release, sizeof(*ptr), GFP_KERNEL);
1006         if (!ptr)
1007                 return ERR_PTR(-ENOMEM);
1008
1009         hwdev = hwmon_device_register_with_groups(dev, name, drvdata, groups);
1010         if (IS_ERR(hwdev))
1011                 goto error;
1012
1013         *ptr = hwdev;
1014         devres_add(dev, ptr);
1015         return hwdev;
1016
1017 error:
1018         devres_free(ptr);
1019         return hwdev;
1020 }
1021 EXPORT_SYMBOL_GPL(devm_hwmon_device_register_with_groups);
1022
1023 /**
1024  * devm_hwmon_device_register_with_info - register w/ hwmon
1025  * @dev:        the parent device
1026  * @name:       hwmon name attribute
1027  * @drvdata:    driver data to attach to created device
1028  * @chip:       pointer to hwmon chip information
1029  * @groups:     pointer to list of driver specific attribute groups
1030  *
1031  * Returns the pointer to the new device. The new device is automatically
1032  * unregistered with the parent device.
1033  */
1034 struct device *
1035 devm_hwmon_device_register_with_info(struct device *dev, const char *name,
1036                                      void *drvdata,
1037                                      const struct hwmon_chip_info *chip,
1038                                      const struct attribute_group **groups)
1039 {
1040         struct device **ptr, *hwdev;
1041
1042         if (!dev)
1043                 return ERR_PTR(-EINVAL);
1044
1045         ptr = devres_alloc(devm_hwmon_release, sizeof(*ptr), GFP_KERNEL);
1046         if (!ptr)
1047                 return ERR_PTR(-ENOMEM);
1048
1049         hwdev = hwmon_device_register_with_info(dev, name, drvdata, chip,
1050                                                 groups);
1051         if (IS_ERR(hwdev))
1052                 goto error;
1053
1054         *ptr = hwdev;
1055         devres_add(dev, ptr);
1056
1057         return hwdev;
1058
1059 error:
1060         devres_free(ptr);
1061         return hwdev;
1062 }
1063 EXPORT_SYMBOL_GPL(devm_hwmon_device_register_with_info);
1064
1065 static int devm_hwmon_match(struct device *dev, void *res, void *data)
1066 {
1067         struct device **hwdev = res;
1068
1069         return *hwdev == data;
1070 }
1071
1072 /**
1073  * devm_hwmon_device_unregister - removes a previously registered hwmon device
1074  *
1075  * @dev: the parent device of the device to unregister
1076  */
1077 void devm_hwmon_device_unregister(struct device *dev)
1078 {
1079         WARN_ON(devres_release(dev, devm_hwmon_release, devm_hwmon_match, dev));
1080 }
1081 EXPORT_SYMBOL_GPL(devm_hwmon_device_unregister);
1082
1083 static char *__hwmon_sanitize_name(struct device *dev, const char *old_name)
1084 {
1085         char *name, *p;
1086
1087         if (dev)
1088                 name = devm_kstrdup(dev, old_name, GFP_KERNEL);
1089         else
1090                 name = kstrdup(old_name, GFP_KERNEL);
1091         if (!name)
1092                 return ERR_PTR(-ENOMEM);
1093
1094         for (p = name; *p; p++)
1095                 if (hwmon_is_bad_char(*p))
1096                         *p = '_';
1097
1098         return name;
1099 }
1100
1101 /**
1102  * hwmon_sanitize_name - Replaces invalid characters in a hwmon name
1103  * @name: NUL-terminated name
1104  *
1105  * Allocates a new string where any invalid characters will be replaced
1106  * by an underscore. It is the responsibility of the caller to release
1107  * the memory.
1108  *
1109  * Returns newly allocated name, or ERR_PTR on error.
1110  */
1111 char *hwmon_sanitize_name(const char *name)
1112 {
1113         return __hwmon_sanitize_name(NULL, name);
1114 }
1115 EXPORT_SYMBOL_GPL(hwmon_sanitize_name);
1116
1117 /**
1118  * devm_hwmon_sanitize_name - resource managed hwmon_sanitize_name()
1119  * @dev: device to allocate memory for
1120  * @name: NUL-terminated name
1121  *
1122  * Allocates a new string where any invalid characters will be replaced
1123  * by an underscore.
1124  *
1125  * Returns newly allocated name, or ERR_PTR on error.
1126  */
1127 char *devm_hwmon_sanitize_name(struct device *dev, const char *name)
1128 {
1129         if (!dev)
1130                 return ERR_PTR(-EINVAL);
1131
1132         return __hwmon_sanitize_name(dev, name);
1133 }
1134 EXPORT_SYMBOL_GPL(devm_hwmon_sanitize_name);
1135
1136 static void __init hwmon_pci_quirks(void)
1137 {
1138 #if defined CONFIG_X86 && defined CONFIG_PCI
1139         struct pci_dev *sb;
1140         u16 base;
1141         u8 enable;
1142
1143         /* Open access to 0x295-0x296 on MSI MS-7031 */
1144         sb = pci_get_device(PCI_VENDOR_ID_ATI, 0x436c, NULL);
1145         if (sb) {
1146                 if (sb->subsystem_vendor == 0x1462 &&   /* MSI */
1147                     sb->subsystem_device == 0x0031) {   /* MS-7031 */
1148                         pci_read_config_byte(sb, 0x48, &enable);
1149                         pci_read_config_word(sb, 0x64, &base);
1150
1151                         if (base == 0 && !(enable & BIT(2))) {
1152                                 dev_info(&sb->dev,
1153                                          "Opening wide generic port at 0x295\n");
1154                                 pci_write_config_word(sb, 0x64, 0x295);
1155                                 pci_write_config_byte(sb, 0x48,
1156                                                       enable | BIT(2));
1157                         }
1158                 }
1159                 pci_dev_put(sb);
1160         }
1161 #endif
1162 }
1163
1164 static int __init hwmon_init(void)
1165 {
1166         int err;
1167
1168         hwmon_pci_quirks();
1169
1170         err = class_register(&hwmon_class);
1171         if (err) {
1172                 pr_err("couldn't register hwmon sysfs class\n");
1173                 return err;
1174         }
1175         return 0;
1176 }
1177
1178 static void __exit hwmon_exit(void)
1179 {
1180         class_unregister(&hwmon_class);
1181 }
1182
1183 subsys_initcall(hwmon_init);
1184 module_exit(hwmon_exit);
1185
1186 MODULE_AUTHOR("Mark M. Hoffman <mhoffman@lightlink.com>");
1187 MODULE_DESCRIPTION("hardware monitoring sysfs/class support");
1188 MODULE_LICENSE("GPL");
1189