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/slab.h>
  22 #include <linux/string.h>
  23 #include <linux/thermal.h>
  24
  25 #define CREATE_TRACE_POINTS
  26 #include <trace/events/hwmon.h>
  27
  28 #define HWMON_ID_PREFIX "hwmon"
  29 #define HWMON_ID_FORMAT HWMON_ID_PREFIX "%d"
  30
  31 struct hwmon_device {
  32         const char *name;
  33         struct device dev;
  34         const struct hwmon_chip_info *chip;
  35         struct list_head tzdata;
  36         struct attribute_group group;
  37         const struct attribute_group **groups;
  38 };
  39
  40 #define to_hwmon_device(d) container_of(d, struct hwmon_device, dev)
  41
  42 #define MAX_SYSFS_ATTR_NAME_LENGTH      32
  43
  44 struct hwmon_device_attribute {
  45         struct device_attribute dev_attr;
  46         const struct hwmon_ops *ops;
  47         enum hwmon_sensor_types type;
  48         u32 attr;
  49         int index;
  50         char name[MAX_SYSFS_ATTR_NAME_LENGTH];
  51 };
  52
  53 #define to_hwmon_attr(d) \
  54         container_of(d, struct hwmon_device_attribute, dev_attr)
  55 #define to_dev_attr(a) container_of(a, struct device_attribute, attr)
  56
  57 /*
  58  * Thermal zone information
  59  */
  60 struct hwmon_thermal_data {
  61         struct list_head node;          /* hwmon tzdata list entry */
  62         struct device *dev;             /* Reference to hwmon device */
  63         int index;                      /* sensor index */
  64         struct thermal_zone_device *tzd;/* thermal zone device */
  65 };
  66
  67 static ssize_t
  68 name_show(struct device *dev, struct device_attribute *attr, char *buf)
  69 {
  70         return sprintf(buf, "%s\n", to_hwmon_device(dev)->name);
  71 }
  72 static DEVICE_ATTR_RO(name);
  73
  74 static struct attribute *hwmon_dev_attrs[] = {
  75         &dev_attr_name.attr,
  76         NULL
  77 };
  78
  79 static umode_t hwmon_dev_name_is_visible(struct kobject *kobj,
  80                                          struct attribute *attr, int n)
  81 {
  82         struct device *dev = container_of(kobj, struct device, kobj);
  83
  84         if (to_hwmon_device(dev)->name == NULL)
  85                 return 0;
  86
  87         return attr->mode;
  88 }
  89
  90 static const struct attribute_group hwmon_dev_attr_group = {
  91         .attrs          = hwmon_dev_attrs,
  92         .is_visible     = hwmon_dev_name_is_visible,
  93 };
  94
  95 static const struct attribute_group *hwmon_dev_attr_groups[] = {
  96         &hwmon_dev_attr_group,
  97         NULL
  98 };
  99
 100 static void hwmon_free_attrs(struct attribute **attrs)
 101 {
 102         int i;
 103
 104         for (i = 0; attrs[i]; i++) {
 105                 struct device_attribute *dattr = to_dev_attr(attrs[i]);
 106                 struct hwmon_device_attribute *hattr = to_hwmon_attr(dattr);
 107
 108                 kfree(hattr);
 109         }
 110         kfree(attrs);
 111 }
 112
 113 static void hwmon_dev_release(struct device *dev)
 114 {
 115         struct hwmon_device *hwdev = to_hwmon_device(dev);
 116
 117         if (hwdev->group.attrs)
 118                 hwmon_free_attrs(hwdev->group.attrs);
 119         kfree(hwdev->groups);
 120         kfree(hwdev);
 121 }
 122
 123 static struct class hwmon_class = {
 124         .name = "hwmon",
 125         .owner = THIS_MODULE,
 126         .dev_groups = hwmon_dev_attr_groups,
 127         .dev_release = hwmon_dev_release,
 128 };
 129
 130 static DEFINE_IDA(hwmon_ida);
 131
 132 /* Thermal zone handling */
 133
 134 /*
 135  * The complex conditional is necessary to avoid a cyclic dependency
 136  * between hwmon and thermal_sys modules.
 137  */
 138 #ifdef CONFIG_THERMAL_OF
 139 static int hwmon_thermal_get_temp(void *data, int *temp)
 140 {
 141         struct hwmon_thermal_data *tdata = data;
 142         struct hwmon_device *hwdev = to_hwmon_device(tdata->dev);
 143         int ret;
 144         long t;
 145
 146         ret = hwdev->chip->ops->read(tdata->dev, hwmon_temp, hwmon_temp_input,
 147                                      tdata->index, &t);
 148         if (ret < 0)
 149                 return ret;
 150
 151         *temp = t;
 152
 153         return 0;
 154 }
 155
 156 static const struct thermal_zone_of_device_ops hwmon_thermal_ops = {
 157         .get_temp = hwmon_thermal_get_temp,
 158 };
 159
 160 static void hwmon_thermal_remove_sensor(void *data)
 161 {
 162         list_del(data);
 163 }
 164
 165 static int hwmon_thermal_add_sensor(struct device *dev, int index)
 166 {
 167         struct hwmon_device *hwdev = to_hwmon_device(dev);
 168         struct hwmon_thermal_data *tdata;
 169         struct thermal_zone_device *tzd;
 170         int err;
 171
 172         tdata = devm_kzalloc(dev, sizeof(*tdata), GFP_KERNEL);
 173         if (!tdata)
 174                 return -ENOMEM;
 175
 176         tdata->dev = dev;
 177         tdata->index = index;
 178
 179         tzd = devm_thermal_zone_of_sensor_register(dev, index, tdata,
 180                                                    &hwmon_thermal_ops);
 181         /*
 182          * If CONFIG_THERMAL_OF is disabled, this returns -ENODEV,
 183          * so ignore that error but forward any other error.
 184          */
 185         if (IS_ERR(tzd) && (PTR_ERR(tzd) != -ENODEV))
 186                 return PTR_ERR(tzd);
 187
 188         err = devm_add_action(dev, hwmon_thermal_remove_sensor, &tdata->node);
 189         if (err)
 190                 return err;
 191
 192         tdata->tzd = tzd;
 193         list_add(&tdata->node, &hwdev->tzdata);
 194
 195         return 0;
 196 }
 197
 198 static int hwmon_thermal_register_sensors(struct device *dev)
 199 {
 200         struct hwmon_device *hwdev = to_hwmon_device(dev);
 201         const struct hwmon_chip_info *chip = hwdev->chip;
 202         const struct hwmon_channel_info **info = chip->info;
 203         void *drvdata = dev_get_drvdata(dev);
 204         int i;
 205
 206         for (i = 1; info[i]; i++) {
 207                 int j;
 208
 209                 if (info[i]->type != hwmon_temp)
 210                         continue;
 211
 212                 for (j = 0; info[i]->config[j]; j++) {
 213                         int err;
 214
 215                         if (!(info[i]->config[j] & HWMON_T_INPUT) ||
 216                             !chip->ops->is_visible(drvdata, hwmon_temp,
 217                                                    hwmon_temp_input, j))
 218                                 continue;
 219
 220                         err = hwmon_thermal_add_sensor(dev, j);
 221                         if (err)
 222                                 return err;
 223                 }
 224         }
 225
 226         return 0;
 227 }
 228
 229 static void hwmon_thermal_notify(struct device *dev, int index)
 230 {
 231         struct hwmon_device *hwdev = to_hwmon_device(dev);
 232         struct hwmon_thermal_data *tzdata;
 233
 234         list_for_each_entry(tzdata, &hwdev->tzdata, node) {
 235                 if (tzdata->index == index) {
 236                         thermal_zone_device_update(tzdata->tzd,
 237                                                    THERMAL_EVENT_UNSPECIFIED);
 238                 }
 239         }
 240 }
 241
 242 #else
 243 static int hwmon_thermal_register_sensors(struct device *dev)
 244 {
 245         return 0;
 246 }
 247
 248 static void hwmon_thermal_notify(struct device *dev, int index) { }
 249
 250 #endif /* IS_REACHABLE(CONFIG_THERMAL) && ... */
 251
 252 static int hwmon_attr_base(enum hwmon_sensor_types type)
 253 {
 254         if (type == hwmon_in || type == hwmon_intrusion)
 255                 return 0;
 256         return 1;
 257 }
 258
 259 /* sysfs attribute management */
 260
 261 static ssize_t hwmon_attr_show(struct device *dev,
 262                                struct device_attribute *devattr, char *buf)
 263 {
 264         struct hwmon_device_attribute *hattr = to_hwmon_attr(devattr);
 265         long val;
 266         int ret;
 267
 268         ret = hattr->ops->read(dev, hattr->type, hattr->attr, hattr->index,
 269                                &val);
 270         if (ret < 0)
 271                 return ret;
 272
 273         trace_hwmon_attr_show(hattr->index + hwmon_attr_base(hattr->type),
 274                               hattr->name, val);
 275
 276         return sprintf(buf, "%ld\n", val);
 277 }
 278
 279 static ssize_t hwmon_attr_show_string(struct device *dev,
 280                                       struct device_attribute *devattr,
 281                                       char *buf)
 282 {
 283         struct hwmon_device_attribute *hattr = to_hwmon_attr(devattr);
 284         enum hwmon_sensor_types type = hattr->type;
 285         const char *s;
 286         int ret;
 287
 288         ret = hattr->ops->read_string(dev, hattr->type, hattr->attr,
 289                                       hattr->index, &s);
 290         if (ret < 0)
 291                 return ret;
 292
 293         trace_hwmon_attr_show_string(hattr->index + hwmon_attr_base(type),
 294                                      hattr->name, s);
 295
 296         return sprintf(buf, "%s\n", s);
 297 }
 298
 299 static ssize_t hwmon_attr_store(struct device *dev,
 300                                 struct device_attribute *devattr,
 301                                 const char *buf, size_t count)
 302 {
 303         struct hwmon_device_attribute *hattr = to_hwmon_attr(devattr);
 304         long val;
 305         int ret;
 306
 307         ret = kstrtol(buf, 10, &val);
 308         if (ret < 0)
 309                 return ret;
 310
 311         ret = hattr->ops->write(dev, hattr->type, hattr->attr, hattr->index,
 312                                 val);
 313         if (ret < 0)
 314                 return ret;
 315
 316         trace_hwmon_attr_store(hattr->index + hwmon_attr_base(hattr->type),
 317                                hattr->name, val);
 318
 319         return count;
 320 }
 321
 322 static bool is_string_attr(enum hwmon_sensor_types type, u32 attr)
 323 {
 324         return (type == hwmon_temp && attr == hwmon_temp_label) ||
 325                (type == hwmon_in && attr == hwmon_in_label) ||
 326                (type == hwmon_curr && attr == hwmon_curr_label) ||
 327                (type == hwmon_power && attr == hwmon_power_label) ||
 328                (type == hwmon_energy && attr == hwmon_energy_label) ||
 329                (type == hwmon_humidity && attr == hwmon_humidity_label) ||
 330                (type == hwmon_fan && attr == hwmon_fan_label);
 331 }
 332
 333 static struct attribute *hwmon_genattr(const void *drvdata,
 334                                        enum hwmon_sensor_types type,
 335                                        u32 attr,
 336                                        int index,
 337                                        const char *template,
 338                                        const struct hwmon_ops *ops)
 339 {
 340         struct hwmon_device_attribute *hattr;
 341         struct device_attribute *dattr;
 342         struct attribute *a;
 343         umode_t mode;
 344         const char *name;
 345         bool is_string = is_string_attr(type, attr);
 346
 347         /* The attribute is invisible if there is no template string */
 348         if (!template)
 349                 return ERR_PTR(-ENOENT);
 350
 351         mode = ops->is_visible(drvdata, type, attr, index);
 352         if (!mode)
 353                 return ERR_PTR(-ENOENT);
 354
 355         if ((mode & 0444) && ((is_string && !ops->read_string) ||
 356                                  (!is_string && !ops->read)))
 357                 return ERR_PTR(-EINVAL);
 358         if ((mode & 0222) && !ops->write)
 359                 return ERR_PTR(-EINVAL);
 360
 361         hattr = kzalloc(sizeof(*hattr), GFP_KERNEL);
 362         if (!hattr)
 363                 return ERR_PTR(-ENOMEM);
 364
 365         if (type == hwmon_chip) {
 366                 name = template;
 367         } else {
 368                 scnprintf(hattr->name, sizeof(hattr->name), template,
 369                           index + hwmon_attr_base(type));
 370                 name = hattr->name;
 371         }
 372
 373         hattr->type = type;
 374         hattr->attr = attr;
 375         hattr->index = index;
 376         hattr->ops = ops;
 377
 378         dattr = &hattr->dev_attr;
 379         dattr->show = is_string ? hwmon_attr_show_string : hwmon_attr_show;
 380         dattr->store = hwmon_attr_store;
 381
 382         a = &dattr->attr;
 383         sysfs_attr_init(a);
 384         a->name = name;
 385         a->mode = mode;
 386
 387         return a;
 388 }
 389
 390 /*
 391  * Chip attributes are not attribute templates but actual sysfs attributes.
 392  * See hwmon_genattr() for special handling.
 393  */
 394 static const char * const hwmon_chip_attrs[] = {
 395         [hwmon_chip_temp_reset_history] = "temp_reset_history",
 396         [hwmon_chip_in_reset_history] = "in_reset_history",
 397         [hwmon_chip_curr_reset_history] = "curr_reset_history",
 398         [hwmon_chip_power_reset_history] = "power_reset_history",
 399         [hwmon_chip_update_interval] = "update_interval",
 400         [hwmon_chip_alarms] = "alarms",
 401         [hwmon_chip_samples] = "samples",
 402         [hwmon_chip_curr_samples] = "curr_samples",
 403         [hwmon_chip_in_samples] = "in_samples",
 404         [hwmon_chip_power_samples] = "power_samples",
 405         [hwmon_chip_temp_samples] = "temp_samples",
 406 };
 407
 408 static const char * const hwmon_temp_attr_templates[] = {
 409         [hwmon_temp_enable] = "temp%d_enable",
 410         [hwmon_temp_input] = "temp%d_input",
 411         [hwmon_temp_type] = "temp%d_type",
 412         [hwmon_temp_lcrit] = "temp%d_lcrit",
 413         [hwmon_temp_lcrit_hyst] = "temp%d_lcrit_hyst",
 414         [hwmon_temp_min] = "temp%d_min",
 415         [hwmon_temp_min_hyst] = "temp%d_min_hyst",
 416         [hwmon_temp_max] = "temp%d_max",
 417         [hwmon_temp_max_hyst] = "temp%d_max_hyst",
 418         [hwmon_temp_crit] = "temp%d_crit",
 419         [hwmon_temp_crit_hyst] = "temp%d_crit_hyst",
 420         [hwmon_temp_emergency] = "temp%d_emergency",
 421         [hwmon_temp_emergency_hyst] = "temp%d_emergency_hyst",
 422         [hwmon_temp_alarm] = "temp%d_alarm",
 423         [hwmon_temp_lcrit_alarm] = "temp%d_lcrit_alarm",
 424         [hwmon_temp_min_alarm] = "temp%d_min_alarm",
 425         [hwmon_temp_max_alarm] = "temp%d_max_alarm",
 426         [hwmon_temp_crit_alarm] = "temp%d_crit_alarm",
 427         [hwmon_temp_emergency_alarm] = "temp%d_emergency_alarm",
 428         [hwmon_temp_fault] = "temp%d_fault",
 429         [hwmon_temp_offset] = "temp%d_offset",
 430         [hwmon_temp_label] = "temp%d_label",
 431         [hwmon_temp_lowest] = "temp%d_lowest",
 432         [hwmon_temp_highest] = "temp%d_highest",
 433         [hwmon_temp_reset_history] = "temp%d_reset_history",
 434 };
 435
 436 static const char * const hwmon_in_attr_templates[] = {
 437         [hwmon_in_enable] = "in%d_enable",
 438         [hwmon_in_input] = "in%d_input",
 439         [hwmon_in_min] = "in%d_min",
 440         [hwmon_in_max] = "in%d_max",
 441         [hwmon_in_lcrit] = "in%d_lcrit",
 442         [hwmon_in_crit] = "in%d_crit",
 443         [hwmon_in_average] = "in%d_average",
 444         [hwmon_in_lowest] = "in%d_lowest",
 445         [hwmon_in_highest] = "in%d_highest",
 446         [hwmon_in_reset_history] = "in%d_reset_history",
 447         [hwmon_in_label] = "in%d_label",
 448         [hwmon_in_alarm] = "in%d_alarm",
 449         [hwmon_in_min_alarm] = "in%d_min_alarm",
 450         [hwmon_in_max_alarm] = "in%d_max_alarm",
 451         [hwmon_in_lcrit_alarm] = "in%d_lcrit_alarm",
 452         [hwmon_in_crit_alarm] = "in%d_crit_alarm",
 453 };
 454
 455 static const char * const hwmon_curr_attr_templates[] = {
 456         [hwmon_curr_enable] = "curr%d_enable",
 457         [hwmon_curr_input] = "curr%d_input",
 458         [hwmon_curr_min] = "curr%d_min",
 459         [hwmon_curr_max] = "curr%d_max",
 460         [hwmon_curr_lcrit] = "curr%d_lcrit",
 461         [hwmon_curr_crit] = "curr%d_crit",
 462         [hwmon_curr_average] = "curr%d_average",
 463         [hwmon_curr_lowest] = "curr%d_lowest",
 464         [hwmon_curr_highest] = "curr%d_highest",
 465         [hwmon_curr_reset_history] = "curr%d_reset_history",
 466         [hwmon_curr_label] = "curr%d_label",
 467         [hwmon_curr_alarm] = "curr%d_alarm",
 468         [hwmon_curr_min_alarm] = "curr%d_min_alarm",
 469         [hwmon_curr_max_alarm] = "curr%d_max_alarm",
 470         [hwmon_curr_lcrit_alarm] = "curr%d_lcrit_alarm",
 471         [hwmon_curr_crit_alarm] = "curr%d_crit_alarm",
 472 };
 473
 474 static const char * const hwmon_power_attr_templates[] = {
 475         [hwmon_power_enable] = "power%d_enable",
 476         [hwmon_power_average] = "power%d_average",
 477         [hwmon_power_average_interval] = "power%d_average_interval",
 478         [hwmon_power_average_interval_max] = "power%d_interval_max",
 479         [hwmon_power_average_interval_min] = "power%d_interval_min",
 480         [hwmon_power_average_highest] = "power%d_average_highest",
 481         [hwmon_power_average_lowest] = "power%d_average_lowest",
 482         [hwmon_power_average_max] = "power%d_average_max",
 483         [hwmon_power_average_min] = "power%d_average_min",
 484         [hwmon_power_input] = "power%d_input",
 485         [hwmon_power_input_highest] = "power%d_input_highest",
 486         [hwmon_power_input_lowest] = "power%d_input_lowest",
 487         [hwmon_power_reset_history] = "power%d_reset_history",
 488         [hwmon_power_accuracy] = "power%d_accuracy",
 489         [hwmon_power_cap] = "power%d_cap",
 490         [hwmon_power_cap_hyst] = "power%d_cap_hyst",
 491         [hwmon_power_cap_max] = "power%d_cap_max",
 492         [hwmon_power_cap_min] = "power%d_cap_min",
 493         [hwmon_power_min] = "power%d_min",
 494         [hwmon_power_max] = "power%d_max",
 495         [hwmon_power_lcrit] = "power%d_lcrit",
 496         [hwmon_power_crit] = "power%d_crit",
 497         [hwmon_power_label] = "power%d_label",
 498         [hwmon_power_alarm] = "power%d_alarm",
 499         [hwmon_power_cap_alarm] = "power%d_cap_alarm",
 500         [hwmon_power_min_alarm] = "power%d_min_alarm",
 501         [hwmon_power_max_alarm] = "power%d_max_alarm",
 502         [hwmon_power_lcrit_alarm] = "power%d_lcrit_alarm",
 503         [hwmon_power_crit_alarm] = "power%d_crit_alarm",
 504 };
 505
 506 static const char * const hwmon_energy_attr_templates[] = {
 507         [hwmon_energy_enable] = "energy%d_enable",
 508         [hwmon_energy_input] = "energy%d_input",
 509         [hwmon_energy_label] = "energy%d_label",
 510 };
 511
 512 static const char * const hwmon_humidity_attr_templates[] = {
 513         [hwmon_humidity_enable] = "humidity%d_enable",
 514         [hwmon_humidity_input] = "humidity%d_input",
 515         [hwmon_humidity_label] = "humidity%d_label",
 516         [hwmon_humidity_min] = "humidity%d_min",
 517         [hwmon_humidity_min_hyst] = "humidity%d_min_hyst",
 518         [hwmon_humidity_max] = "humidity%d_max",
 519         [hwmon_humidity_max_hyst] = "humidity%d_max_hyst",
 520         [hwmon_humidity_alarm] = "humidity%d_alarm",
 521         [hwmon_humidity_fault] = "humidity%d_fault",
 522 };
 523
 524 static const char * const hwmon_fan_attr_templates[] = {
 525         [hwmon_fan_enable] = "fan%d_enable",
 526         [hwmon_fan_input] = "fan%d_input",
 527         [hwmon_fan_label] = "fan%d_label",
 528         [hwmon_fan_min] = "fan%d_min",
 529         [hwmon_fan_max] = "fan%d_max",
 530         [hwmon_fan_div] = "fan%d_div",
 531         [hwmon_fan_pulses] = "fan%d_pulses",
 532         [hwmon_fan_target] = "fan%d_target",
 533         [hwmon_fan_alarm] = "fan%d_alarm",
 534         [hwmon_fan_min_alarm] = "fan%d_min_alarm",
 535         [hwmon_fan_max_alarm] = "fan%d_max_alarm",
 536         [hwmon_fan_fault] = "fan%d_fault",
 537 };
 538
 539 static const char * const hwmon_pwm_attr_templates[] = {
 540         [hwmon_pwm_input] = "pwm%d",
 541         [hwmon_pwm_enable] = "pwm%d_enable",
 542         [hwmon_pwm_mode] = "pwm%d_mode",
 543         [hwmon_pwm_freq] = "pwm%d_freq",
 544 };
 545
 546 static const char * const hwmon_intrusion_attr_templates[] = {
 547         [hwmon_intrusion_alarm] = "intrusion%d_alarm",
 548         [hwmon_intrusion_beep]  = "intrusion%d_beep",
 549 };
 550
 551 static const char * const *__templates[] = {
 552         [hwmon_chip] = hwmon_chip_attrs,
 553         [hwmon_temp] = hwmon_temp_attr_templates,
 554         [hwmon_in] = hwmon_in_attr_templates,
 555         [hwmon_curr] = hwmon_curr_attr_templates,
 556         [hwmon_power] = hwmon_power_attr_templates,
 557         [hwmon_energy] = hwmon_energy_attr_templates,
 558         [hwmon_humidity] = hwmon_humidity_attr_templates,
 559         [hwmon_fan] = hwmon_fan_attr_templates,
 560         [hwmon_pwm] = hwmon_pwm_attr_templates,
 561         [hwmon_intrusion] = hwmon_intrusion_attr_templates,
 562 };
 563
 564 static const int __templates_size[] = {
 565         [hwmon_chip] = ARRAY_SIZE(hwmon_chip_attrs),
 566         [hwmon_temp] = ARRAY_SIZE(hwmon_temp_attr_templates),
 567         [hwmon_in] = ARRAY_SIZE(hwmon_in_attr_templates),
 568         [hwmon_curr] = ARRAY_SIZE(hwmon_curr_attr_templates),
 569         [hwmon_power] = ARRAY_SIZE(hwmon_power_attr_templates),
 570         [hwmon_energy] = ARRAY_SIZE(hwmon_energy_attr_templates),
 571         [hwmon_humidity] = ARRAY_SIZE(hwmon_humidity_attr_templates),
 572         [hwmon_fan] = ARRAY_SIZE(hwmon_fan_attr_templates),
 573         [hwmon_pwm] = ARRAY_SIZE(hwmon_pwm_attr_templates),
 574         [hwmon_intrusion] = ARRAY_SIZE(hwmon_intrusion_attr_templates),
 575 };
 576
 577 int hwmon_notify_event(struct device *dev, enum hwmon_sensor_types type,
 578                        u32 attr, int channel)
 579 {
 580         char sattr[MAX_SYSFS_ATTR_NAME_LENGTH];
 581         const char * const *templates;
 582         const char *template;
 583         int base;
 584
 585         if (type >= ARRAY_SIZE(__templates))
 586                 return -EINVAL;
 587         if (attr >= __templates_size[type])
 588                 return -EINVAL;
 589
 590         templates = __templates[type];
 591         template = templates[attr];
 592
 593         base = hwmon_attr_base(type);
 594
 595         scnprintf(sattr, MAX_SYSFS_ATTR_NAME_LENGTH, template, base + channel);
 596         sysfs_notify(&dev->kobj, NULL, sattr);
 597         kobject_uevent(&dev->kobj, KOBJ_CHANGE);
 598
 599         if (type == hwmon_temp)
 600                 hwmon_thermal_notify(dev, channel);
 601
 602         return 0;
 603 }
 604 EXPORT_SYMBOL_GPL(hwmon_notify_event);
 605
 606 static int hwmon_num_channel_attrs(const struct hwmon_channel_info *info)
 607 {
 608         int i, n;
 609
 610         for (i = n = 0; info->config[i]; i++)
 611                 n += hweight32(info->config[i]);
 612
 613         return n;
 614 }
 615
 616 static int hwmon_genattrs(const void *drvdata,
 617                           struct attribute **attrs,
 618                           const struct hwmon_ops *ops,
 619                           const struct hwmon_channel_info *info)
 620 {
 621         const char * const *templates;
 622         int template_size;
 623         int i, aindex = 0;
 624
 625         if (info->type >= ARRAY_SIZE(__templates))
 626                 return -EINVAL;
 627
 628         templates = __templates[info->type];
 629         template_size = __templates_size[info->type];
 630
 631         for (i = 0; info->config[i]; i++) {
 632                 u32 attr_mask = info->config[i];
 633                 u32 attr;
 634
 635                 while (attr_mask) {
 636                         struct attribute *a;
 637
 638                         attr = __ffs(attr_mask);
 639                         attr_mask &= ~BIT(attr);
 640                         if (attr >= template_size)
 641                                 return -EINVAL;
 642                         a = hwmon_genattr(drvdata, info->type, attr, i,
 643                                           templates[attr], ops);
 644                         if (IS_ERR(a)) {
 645                                 if (PTR_ERR(a) != -ENOENT)
 646                                         return PTR_ERR(a);
 647                                 continue;
 648                         }
 649                         attrs[aindex++] = a;
 650                 }
 651         }
 652         return aindex;
 653 }
 654
 655 static struct attribute **
 656 __hwmon_create_attrs(const void *drvdata, const struct hwmon_chip_info *chip)
 657 {
 658         int ret, i, aindex = 0, nattrs = 0;
 659         struct attribute **attrs;
 660
 661         for (i = 0; chip->info[i]; i++)
 662                 nattrs += hwmon_num_channel_attrs(chip->info[i]);
 663
 664         if (nattrs == 0)
 665                 return ERR_PTR(-EINVAL);
 666
 667         attrs = kcalloc(nattrs + 1, sizeof(*attrs), GFP_KERNEL);
 668         if (!attrs)
 669                 return ERR_PTR(-ENOMEM);
 670
 671         for (i = 0; chip->info[i]; i++) {
 672                 ret = hwmon_genattrs(drvdata, &attrs[aindex], chip->ops,
 673                                      chip->info[i]);
 674                 if (ret < 0) {
 675                         hwmon_free_attrs(attrs);
 676                         return ERR_PTR(ret);
 677                 }
 678                 aindex += ret;
 679         }
 680
 681         return attrs;
 682 }
 683
 684 static struct device *
 685 __hwmon_device_register(struct device *dev, const char *name, void *drvdata,
 686                         const struct hwmon_chip_info *chip,
 687                         const struct attribute_group **groups)
 688 {
 689         struct hwmon_device *hwdev;
 690         struct device *hdev;
 691         int i, err, id;
 692
 693         /* Complain about invalid characters in hwmon name attribute */
 694         if (name && (!strlen(name) || strpbrk(name, "-* \t\n")))
 695                 dev_warn(dev,
 696                          "hwmon: '%s' is not a valid name attribute, please fix\n",
 697                          name);
 698
 699         id = ida_simple_get(&hwmon_ida, 0, 0, GFP_KERNEL);
 700         if (id < 0)
 701                 return ERR_PTR(id);
 702
 703         hwdev = kzalloc(sizeof(*hwdev), GFP_KERNEL);
 704         if (hwdev == NULL) {
 705                 err = -ENOMEM;
 706                 goto ida_remove;
 707         }
 708
 709         hdev = &hwdev->dev;
 710
 711         if (chip) {
 712                 struct attribute **attrs;
 713                 int ngroups = 2; /* terminating NULL plus &hwdev->groups */
 714
 715                 if (groups)
 716                         for (i = 0; groups[i]; i++)
 717                                 ngroups++;
 718
 719                 hwdev->groups = kcalloc(ngroups, sizeof(*groups), GFP_KERNEL);
 720                 if (!hwdev->groups) {
 721                         err = -ENOMEM;
 722                         goto free_hwmon;
 723                 }
 724
 725                 attrs = __hwmon_create_attrs(drvdata, chip);
 726                 if (IS_ERR(attrs)) {
 727                         err = PTR_ERR(attrs);
 728                         goto free_hwmon;
 729                 }
 730
 731                 hwdev->group.attrs = attrs;
 732                 ngroups = 0;
 733                 hwdev->groups[ngroups++] = &hwdev->group;
 734
 735                 if (groups) {
 736                         for (i = 0; groups[i]; i++)
 737                                 hwdev->groups[ngroups++] = groups[i];
 738                 }
 739
 740                 hdev->groups = hwdev->groups;
 741         } else {
 742                 hdev->groups = groups;
 743         }
 744
 745         hwdev->name = name;
 746         hdev->class = &hwmon_class;
 747         hdev->parent = dev;
 748         hdev->of_node = dev ? dev->of_node : NULL;
 749         hwdev->chip = chip;
 750         dev_set_drvdata(hdev, drvdata);
 751         dev_set_name(hdev, HWMON_ID_FORMAT, id);
 752         err = device_register(hdev);
 753         if (err)
 754                 goto free_hwmon;
 755
 756         INIT_LIST_HEAD(&hwdev->tzdata);
 757
 758         if (dev && dev->of_node && chip && chip->ops->read &&
 759             chip->info[0]->type == hwmon_chip &&
 760             (chip->info[0]->config[0] & HWMON_C_REGISTER_TZ)) {
 761                 err = hwmon_thermal_register_sensors(hdev);
 762                 if (err) {
 763                         device_unregister(hdev);
 764                         /*
 765                          * Don't worry about hwdev; hwmon_dev_release(), called
 766                          * from device_unregister(), will free it.
 767                          */
 768                         goto ida_remove;
 769                 }
 770         }
 771
 772         return hdev;
 773
 774 free_hwmon:
 775         hwmon_dev_release(hdev);
 776 ida_remove:
 777         ida_simple_remove(&hwmon_ida, id);
 778         return ERR_PTR(err);
 779 }
 780
 781 /**
 782  * hwmon_device_register_with_groups - register w/ hwmon
 783  * @dev: the parent device
 784  * @name: hwmon name attribute
 785  * @drvdata: driver data to attach to created device
 786  * @groups: List of attribute groups to create
 787  *
 788  * hwmon_device_unregister() must be called when the device is no
 789  * longer needed.
 790  *
 791  * Returns the pointer to the new device.
 792  */
 793 struct device *
 794 hwmon_device_register_with_groups(struct device *dev, const char *name,
 795                                   void *drvdata,
 796                                   const struct attribute_group **groups)
 797 {
 798         if (!name)
 799                 return ERR_PTR(-EINVAL);
 800
 801         return __hwmon_device_register(dev, name, drvdata, NULL, groups);
 802 }
 803 EXPORT_SYMBOL_GPL(hwmon_device_register_with_groups);
 804
 805 /**
 806  * hwmon_device_register_with_info - register w/ hwmon
 807  * @dev: the parent device
 808  * @name: hwmon name attribute
 809  * @drvdata: driver data to attach to created device
 810  * @chip: pointer to hwmon chip information
 811  * @extra_groups: pointer to list of additional non-standard attribute groups
 812  *
 813  * hwmon_device_unregister() must be called when the device is no
 814  * longer needed.
 815  *
 816  * Returns the pointer to the new device.
 817  */
 818 struct device *
 819 hwmon_device_register_with_info(struct device *dev, const char *name,
 820                                 void *drvdata,
 821                                 const struct hwmon_chip_info *chip,
 822                                 const struct attribute_group **extra_groups)
 823 {
 824         if (!name)
 825                 return ERR_PTR(-EINVAL);
 826
 827         if (chip && (!chip->ops || !chip->ops->is_visible || !chip->info))
 828                 return ERR_PTR(-EINVAL);
 829
 830         if (chip && !dev)
 831                 return ERR_PTR(-EINVAL);
 832
 833         return __hwmon_device_register(dev, name, drvdata, chip, extra_groups);
 834 }
 835 EXPORT_SYMBOL_GPL(hwmon_device_register_with_info);
 836
 837 /**
 838  * hwmon_device_register - register w/ hwmon
 839  * @dev: the device to register
 840  *
 841  * hwmon_device_unregister() must be called when the device is no
 842  * longer needed.
 843  *
 844  * Returns the pointer to the new device.
 845  */
 846 struct device *hwmon_device_register(struct device *dev)
 847 {
 848         dev_warn(dev,
 849                  "hwmon_device_register() is deprecated. Please convert the driver to use hwmon_device_register_with_info().\n");
 850
 851         return __hwmon_device_register(dev, NULL, NULL, NULL, NULL);
 852 }
 853 EXPORT_SYMBOL_GPL(hwmon_device_register);
 854
 855 /**
 856  * hwmon_device_unregister - removes the previously registered class device
 857  *
 858  * @dev: the class device to destroy
 859  */
 860 void hwmon_device_unregister(struct device *dev)
 861 {
 862         int id;
 863
 864         if (likely(sscanf(dev_name(dev), HWMON_ID_FORMAT, &id) == 1)) {
 865                 device_unregister(dev);
 866                 ida_simple_remove(&hwmon_ida, id);
 867         } else
 868                 dev_dbg(dev->parent,
 869                         "hwmon_device_unregister() failed: bad class ID!\n");
 870 }
 871 EXPORT_SYMBOL_GPL(hwmon_device_unregister);
 872
 873 static void devm_hwmon_release(struct device *dev, void *res)
 874 {
 875         struct device *hwdev = *(struct device **)res;
 876
 877         hwmon_device_unregister(hwdev);
 878 }
 879
 880 /**
 881  * devm_hwmon_device_register_with_groups - register w/ hwmon
 882  * @dev: the parent device
 883  * @name: hwmon name attribute
 884  * @drvdata: driver data to attach to created device
 885  * @groups: List of attribute groups to create
 886  *
 887  * Returns the pointer to the new device. The new device is automatically
 888  * unregistered with the parent device.
 889  */
 890 struct device *
 891 devm_hwmon_device_register_with_groups(struct device *dev, const char *name,
 892                                        void *drvdata,
 893                                        const struct attribute_group **groups)
 894 {
 895         struct device **ptr, *hwdev;
 896
 897         if (!dev)
 898                 return ERR_PTR(-EINVAL);
 899
 900         ptr = devres_alloc(devm_hwmon_release, sizeof(*ptr), GFP_KERNEL);
 901         if (!ptr)
 902                 return ERR_PTR(-ENOMEM);
 903
 904         hwdev = hwmon_device_register_with_groups(dev, name, drvdata, groups);
 905         if (IS_ERR(hwdev))
 906                 goto error;
 907
 908         *ptr = hwdev;
 909         devres_add(dev, ptr);
 910         return hwdev;
 911
 912 error:
 913         devres_free(ptr);
 914         return hwdev;
 915 }
 916 EXPORT_SYMBOL_GPL(devm_hwmon_device_register_with_groups);
 917
 918 /**
 919  * devm_hwmon_device_register_with_info - register w/ hwmon
 920  * @dev:        the parent device
 921  * @name:       hwmon name attribute
 922  * @drvdata:    driver data to attach to created device
 923  * @chip:       pointer to hwmon chip information
 924  * @groups:     pointer to list of driver specific attribute groups
 925  *
 926  * Returns the pointer to the new device. The new device is automatically
 927  * unregistered with the parent device.
 928  */
 929 struct device *
 930 devm_hwmon_device_register_with_info(struct device *dev, const char *name,
 931                                      void *drvdata,
 932                                      const struct hwmon_chip_info *chip,
 933                                      const struct attribute_group **groups)
 934 {
 935         struct device **ptr, *hwdev;
 936
 937         if (!dev)
 938                 return ERR_PTR(-EINVAL);
 939
 940         ptr = devres_alloc(devm_hwmon_release, sizeof(*ptr), GFP_KERNEL);
 941         if (!ptr)
 942                 return ERR_PTR(-ENOMEM);
 943
 944         hwdev = hwmon_device_register_with_info(dev, name, drvdata, chip,
 945                                                 groups);
 946         if (IS_ERR(hwdev))
 947                 goto error;
 948
 949         *ptr = hwdev;
 950         devres_add(dev, ptr);
 951
 952         return hwdev;
 953
 954 error:
 955         devres_free(ptr);
 956         return hwdev;
 957 }
 958 EXPORT_SYMBOL_GPL(devm_hwmon_device_register_with_info);
 959
 960 static int devm_hwmon_match(struct device *dev, void *res, void *data)
 961 {
 962         struct device **hwdev = res;
 963
 964         return *hwdev == data;
 965 }
 966
 967 /**
 968  * devm_hwmon_device_unregister - removes a previously registered hwmon device
 969  *
 970  * @dev: the parent device of the device to unregister
 971  */
 972 void devm_hwmon_device_unregister(struct device *dev)
 973 {
 974         WARN_ON(devres_release(dev, devm_hwmon_release, devm_hwmon_match, dev));
 975 }
 976 EXPORT_SYMBOL_GPL(devm_hwmon_device_unregister);
 977
 978 static void __init hwmon_pci_quirks(void)
 979 {
 980 #if defined CONFIG_X86 && defined CONFIG_PCI
 981         struct pci_dev *sb;
 982         u16 base;
 983         u8 enable;
 984
 985         /* Open access to 0x295-0x296 on MSI MS-7031 */
 986         sb = pci_get_device(PCI_VENDOR_ID_ATI, 0x436c, NULL);
 987         if (sb) {
 988                 if (sb->subsystem_vendor == 0x1462 &&   /* MSI */
 989                     sb->subsystem_device == 0x0031) {   /* MS-7031 */
 990                         pci_read_config_byte(sb, 0x48, &enable);
 991                         pci_read_config_word(sb, 0x64, &base);
 992
 993                         if (base == 0 && !(enable & BIT(2))) {
 994                                 dev_info(&sb->dev,
 995                                          "Opening wide generic port at 0x295\n");
 996                                 pci_write_config_word(sb, 0x64, 0x295);
 997                                 pci_write_config_byte(sb, 0x48,
 998                                                       enable | BIT(2));
 999                         }
1000                 }
1001                 pci_dev_put(sb);
1002         }
1003 #endif
1004 }
1005
1006 static int __init hwmon_init(void)
1007 {
1008         int err;
1009
1010         hwmon_pci_quirks();
1011
1012         err = class_register(&hwmon_class);
1013         if (err) {
1014                 pr_err("couldn't register hwmon sysfs class\n");
1015                 return err;
1016         }
1017         return 0;
1018 }
1019
1020 static void __exit hwmon_exit(void)
1021 {
1022         class_unregister(&hwmon_class);
1023 }
1024
1025 subsys_initcall(hwmon_init);
1026 module_exit(hwmon_exit);
1027
1028 MODULE_AUTHOR("Mark M. Hoffman <mhoffman@lightlink.com>");
1029 MODULE_DESCRIPTION("hardware monitoring sysfs/class support");
1030 MODULE_LICENSE("GPL");
1031