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/i2c.h> 18 #include <linux/idr.h> 19 #include <linux/kstrtox.h> 20 #include <linux/list.h> 21 #include <linux/module.h> 22 #include <linux/mutex.h> 23 #include <linux/pci.h> 24 #include <linux/property.h> 25 #include <linux/slab.h> 26 #include <linux/string.h> 27 #include <linux/thermal.h> 28 29 #define CREATE_TRACE_POINTS 30 #include <trace/events/hwmon.h> 31 32 #define HWMON_ID_PREFIX "hwmon" 33 #define HWMON_ID_FORMAT HWMON_ID_PREFIX "%d" 34 35 struct hwmon_device { 36 const char *name; 37 const char *label; 38 struct device dev; 39 const struct hwmon_chip_info *chip; 40 struct mutex lock; 41 struct list_head tzdata; 42 struct attribute_group group; 43 const struct attribute_group **groups; 44 }; 45 46 #define to_hwmon_device(d) container_of(d, struct hwmon_device, dev) 47 48 #define MAX_SYSFS_ATTR_NAME_LENGTH 32 49 50 struct hwmon_device_attribute { 51 struct device_attribute dev_attr; 52 const struct hwmon_ops *ops; 53 enum hwmon_sensor_types type; 54 u32 attr; 55 int index; 56 char name[MAX_SYSFS_ATTR_NAME_LENGTH]; 57 }; 58 59 #define to_hwmon_attr(d) \ 60 container_of(d, struct hwmon_device_attribute, dev_attr) 61 #define to_dev_attr(a) container_of(a, struct device_attribute, attr) 62 63 /* 64 * Thermal zone information 65 */ 66 struct hwmon_thermal_data { 67 struct list_head node; /* hwmon tzdata list entry */ 68 struct device *dev; /* Reference to hwmon device */ 69 int index; /* sensor index */ 70 struct thermal_zone_device *tzd;/* thermal zone device */ 71 }; 72 73 static ssize_t 74 name_show(struct device *dev, struct device_attribute *attr, char *buf) 75 { 76 return sysfs_emit(buf, "%s\n", to_hwmon_device(dev)->name); 77 } 78 static DEVICE_ATTR_RO(name); 79 80 static ssize_t 81 label_show(struct device *dev, struct device_attribute *attr, char *buf) 82 { 83 return sysfs_emit(buf, "%s\n", to_hwmon_device(dev)->label); 84 } 85 static DEVICE_ATTR_RO(label); 86 87 static struct attribute *hwmon_dev_attrs[] = { 88 &dev_attr_name.attr, 89 &dev_attr_label.attr, 90 NULL 91 }; 92 93 static umode_t hwmon_dev_attr_is_visible(struct kobject *kobj, 94 struct attribute *attr, int n) 95 { 96 struct device *dev = kobj_to_dev(kobj); 97 struct hwmon_device *hdev = to_hwmon_device(dev); 98 99 if (attr == &dev_attr_name.attr && hdev->name == NULL) 100 return 0; 101 102 if (attr == &dev_attr_label.attr && hdev->label == NULL) 103 return 0; 104 105 return attr->mode; 106 } 107 108 static const struct attribute_group hwmon_dev_attr_group = { 109 .attrs = hwmon_dev_attrs, 110 .is_visible = hwmon_dev_attr_is_visible, 111 }; 112 113 static const struct attribute_group *hwmon_dev_attr_groups[] = { 114 &hwmon_dev_attr_group, 115 NULL 116 }; 117 118 static void hwmon_free_attrs(struct attribute **attrs) 119 { 120 int i; 121 122 for (i = 0; attrs[i]; i++) { 123 struct device_attribute *dattr = to_dev_attr(attrs[i]); 124 struct hwmon_device_attribute *hattr = to_hwmon_attr(dattr); 125 126 kfree(hattr); 127 } 128 kfree(attrs); 129 } 130 131 static void hwmon_dev_release(struct device *dev) 132 { 133 struct hwmon_device *hwdev = to_hwmon_device(dev); 134 135 if (hwdev->group.attrs) 136 hwmon_free_attrs(hwdev->group.attrs); 137 kfree(hwdev->groups); 138 kfree(hwdev->label); 139 kfree(hwdev); 140 } 141 142 static const struct class hwmon_class = { 143 .name = "hwmon", 144 .dev_groups = hwmon_dev_attr_groups, 145 .dev_release = hwmon_dev_release, 146 }; 147 148 static DEFINE_IDA(hwmon_ida); 149 150 static umode_t hwmon_is_visible(const struct hwmon_ops *ops, 151 const void *drvdata, 152 enum hwmon_sensor_types type, 153 u32 attr, int channel) 154 { 155 if (ops->visible) 156 return ops->visible; 157 158 return ops->is_visible(drvdata, type, attr, channel); 159 } 160 161 /* Thermal zone handling */ 162 163 static int hwmon_thermal_get_temp(struct thermal_zone_device *tz, int *temp) 164 { 165 struct hwmon_thermal_data *tdata = thermal_zone_device_priv(tz); 166 struct hwmon_device *hwdev = to_hwmon_device(tdata->dev); 167 int ret; 168 long t; 169 170 guard(mutex)(&hwdev->lock); 171 172 ret = hwdev->chip->ops->read(tdata->dev, hwmon_temp, hwmon_temp_input, 173 tdata->index, &t); 174 if (ret < 0) 175 return ret; 176 177 *temp = t; 178 179 return 0; 180 } 181 182 static int hwmon_thermal_set_trips(struct thermal_zone_device *tz, int low, int high) 183 { 184 struct hwmon_thermal_data *tdata = thermal_zone_device_priv(tz); 185 struct hwmon_device *hwdev = to_hwmon_device(tdata->dev); 186 const struct hwmon_chip_info *chip = hwdev->chip; 187 const struct hwmon_channel_info * const *info = chip->info; 188 unsigned int i; 189 int err; 190 191 if (!chip->ops->write) 192 return 0; 193 194 for (i = 0; info[i] && info[i]->type != hwmon_temp; i++) 195 continue; 196 197 if (!info[i]) 198 return 0; 199 200 guard(mutex)(&hwdev->lock); 201 202 if (info[i]->config[tdata->index] & HWMON_T_MIN) { 203 err = chip->ops->write(tdata->dev, hwmon_temp, 204 hwmon_temp_min, tdata->index, low); 205 if (err && err != -EOPNOTSUPP) 206 return err; 207 } 208 209 if (info[i]->config[tdata->index] & HWMON_T_MAX) { 210 err = chip->ops->write(tdata->dev, hwmon_temp, 211 hwmon_temp_max, tdata->index, high); 212 if (err && err != -EOPNOTSUPP) 213 return err; 214 } 215 216 return 0; 217 } 218 219 static const struct thermal_zone_device_ops hwmon_thermal_ops = { 220 .get_temp = hwmon_thermal_get_temp, 221 .set_trips = hwmon_thermal_set_trips, 222 }; 223 224 static void hwmon_thermal_remove_sensor(void *data) 225 { 226 list_del(data); 227 } 228 229 static int hwmon_thermal_add_sensor(struct device *dev, int index) 230 { 231 struct hwmon_device *hwdev = to_hwmon_device(dev); 232 struct hwmon_thermal_data *tdata; 233 struct thermal_zone_device *tzd; 234 int err; 235 236 tdata = devm_kzalloc(dev, sizeof(*tdata), GFP_KERNEL); 237 if (!tdata) 238 return -ENOMEM; 239 240 tdata->dev = dev; 241 tdata->index = index; 242 243 tzd = devm_thermal_of_zone_register(dev, index, tdata, 244 &hwmon_thermal_ops); 245 if (IS_ERR(tzd)) { 246 if (PTR_ERR(tzd) != -ENODEV) 247 return PTR_ERR(tzd); 248 dev_info(dev, "temp%d_input not attached to any thermal zone\n", 249 index + 1); 250 devm_kfree(dev, tdata); 251 return 0; 252 } 253 254 err = devm_add_action(dev, hwmon_thermal_remove_sensor, &tdata->node); 255 if (err) 256 return err; 257 258 tdata->tzd = tzd; 259 list_add(&tdata->node, &hwdev->tzdata); 260 261 return 0; 262 } 263 264 static int hwmon_thermal_register_sensors(struct device *dev) 265 { 266 struct hwmon_device *hwdev = to_hwmon_device(dev); 267 const struct hwmon_chip_info *chip = hwdev->chip; 268 const struct hwmon_channel_info * const *info = chip->info; 269 void *drvdata = dev_get_drvdata(dev); 270 int i; 271 272 if (!IS_ENABLED(CONFIG_THERMAL_OF)) 273 return 0; 274 275 for (i = 1; info[i]; i++) { 276 int j; 277 278 if (info[i]->type != hwmon_temp) 279 continue; 280 281 for (j = 0; info[i]->config[j]; j++) { 282 int err; 283 284 if (!(info[i]->config[j] & HWMON_T_INPUT) || 285 !hwmon_is_visible(chip->ops, drvdata, hwmon_temp, 286 hwmon_temp_input, j)) 287 continue; 288 289 err = hwmon_thermal_add_sensor(dev, j); 290 if (err) 291 return err; 292 } 293 } 294 295 return 0; 296 } 297 298 static void hwmon_thermal_notify(struct device *dev, int index) 299 { 300 struct hwmon_device *hwdev = to_hwmon_device(dev); 301 struct hwmon_thermal_data *tzdata; 302 303 if (!IS_ENABLED(CONFIG_THERMAL_OF)) 304 return; 305 306 list_for_each_entry(tzdata, &hwdev->tzdata, node) { 307 if (tzdata->index == index) { 308 thermal_zone_device_update(tzdata->tzd, 309 THERMAL_EVENT_UNSPECIFIED); 310 } 311 } 312 } 313 314 static int hwmon_attr_base(enum hwmon_sensor_types type) 315 { 316 if (type == hwmon_in || type == hwmon_intrusion) 317 return 0; 318 return 1; 319 } 320 321 #if IS_REACHABLE(CONFIG_I2C) 322 323 /* 324 * PEC support 325 * 326 * The 'pec' attribute is attached to I2C client devices. It is only provided 327 * if the i2c controller supports PEC. 328 * 329 * The mutex ensures that PEC configuration between i2c device and the hardware 330 * is consistent. Use a single mutex because attribute writes are supposed to be 331 * rare, and maintaining a separate mutex for each hardware monitoring device 332 * would add substantial complexity to the driver for little if any gain. 333 * 334 * The hardware monitoring device is identified as child of the i2c client 335 * device. This assumes that only a single hardware monitoring device is 336 * attached to an i2c client device. 337 */ 338 339 static int hwmon_match_device(struct device *dev, const void *data) 340 { 341 return dev->class == &hwmon_class; 342 } 343 344 static ssize_t pec_show(struct device *dev, struct device_attribute *dummy, 345 char *buf) 346 { 347 struct i2c_client *client = to_i2c_client(dev); 348 349 return sysfs_emit(buf, "%d\n", !!(client->flags & I2C_CLIENT_PEC)); 350 } 351 352 static ssize_t pec_store(struct device *dev, struct device_attribute *devattr, 353 const char *buf, size_t count) 354 { 355 struct i2c_client *client = to_i2c_client(dev); 356 struct hwmon_device *hwdev; 357 struct device *hdev; 358 bool val; 359 int err; 360 361 err = kstrtobool(buf, &val); 362 if (err < 0) 363 return err; 364 365 hdev = device_find_child(dev, NULL, hwmon_match_device); 366 if (!hdev) 367 return -ENODEV; 368 369 /* 370 * If there is no write function, we assume that chip specific 371 * handling is not required. 372 */ 373 hwdev = to_hwmon_device(hdev); 374 guard(mutex)(&hwdev->lock); 375 if (hwdev->chip->ops->write) { 376 err = hwdev->chip->ops->write(hdev, hwmon_chip, hwmon_chip_pec, 0, val); 377 if (err && err != -EOPNOTSUPP) 378 goto put; 379 } 380 381 if (!val) 382 client->flags &= ~I2C_CLIENT_PEC; 383 else 384 client->flags |= I2C_CLIENT_PEC; 385 386 err = count; 387 put: 388 put_device(hdev); 389 390 return err; 391 } 392 393 static DEVICE_ATTR_RW(pec); 394 395 static void hwmon_remove_pec(void *dev) 396 { 397 device_remove_file(dev, &dev_attr_pec); 398 } 399 400 static int hwmon_pec_register(struct device *hdev) 401 { 402 struct i2c_client *client = i2c_verify_client(hdev->parent); 403 int err; 404 405 if (!client) 406 return -EINVAL; 407 408 if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_PEC)) 409 return 0; 410 411 err = device_create_file(&client->dev, &dev_attr_pec); 412 if (err) 413 return err; 414 415 return devm_add_action_or_reset(hdev, hwmon_remove_pec, &client->dev); 416 } 417 418 #else /* CONFIG_I2C */ 419 static int hwmon_pec_register(struct device *hdev) 420 { 421 return -EINVAL; 422 } 423 #endif /* CONFIG_I2C */ 424 425 /* sysfs attribute management */ 426 427 static ssize_t hwmon_attr_show(struct device *dev, 428 struct device_attribute *devattr, char *buf) 429 { 430 struct hwmon_device_attribute *hattr = to_hwmon_attr(devattr); 431 struct hwmon_device *hwdev = to_hwmon_device(dev); 432 s64 val64; 433 long val; 434 int ret; 435 436 guard(mutex)(&hwdev->lock); 437 438 ret = hattr->ops->read(dev, hattr->type, hattr->attr, hattr->index, 439 (hattr->type == hwmon_energy64) ? (long *)&val64 : &val); 440 if (ret < 0) 441 return ret; 442 443 if (hattr->type != hwmon_energy64) 444 val64 = val; 445 446 trace_hwmon_attr_show(hattr->index + hwmon_attr_base(hattr->type), 447 hattr->name, val64); 448 449 return sysfs_emit(buf, "%lld\n", val64); 450 } 451 452 static ssize_t hwmon_attr_show_string(struct device *dev, 453 struct device_attribute *devattr, 454 char *buf) 455 { 456 struct hwmon_device_attribute *hattr = to_hwmon_attr(devattr); 457 struct hwmon_device *hwdev = to_hwmon_device(dev); 458 enum hwmon_sensor_types type = hattr->type; 459 const char *s; 460 int ret; 461 462 guard(mutex)(&hwdev->lock); 463 464 ret = hattr->ops->read_string(dev, hattr->type, hattr->attr, 465 hattr->index, &s); 466 if (ret < 0) 467 return ret; 468 469 trace_hwmon_attr_show_string(hattr->index + hwmon_attr_base(type), 470 hattr->name, s); 471 472 return sysfs_emit(buf, "%s\n", s); 473 } 474 475 static ssize_t hwmon_attr_store(struct device *dev, 476 struct device_attribute *devattr, 477 const char *buf, size_t count) 478 { 479 struct hwmon_device_attribute *hattr = to_hwmon_attr(devattr); 480 struct hwmon_device *hwdev = to_hwmon_device(dev); 481 long val; 482 int ret; 483 484 ret = kstrtol(buf, 10, &val); 485 if (ret < 0) 486 return ret; 487 488 guard(mutex)(&hwdev->lock); 489 490 ret = hattr->ops->write(dev, hattr->type, hattr->attr, hattr->index, 491 val); 492 if (ret < 0) 493 return ret; 494 495 trace_hwmon_attr_store(hattr->index + hwmon_attr_base(hattr->type), 496 hattr->name, (s64)val); 497 498 return count; 499 } 500 501 static bool is_string_attr(enum hwmon_sensor_types type, u32 attr) 502 { 503 return (type == hwmon_temp && attr == hwmon_temp_label) || 504 (type == hwmon_in && attr == hwmon_in_label) || 505 (type == hwmon_curr && attr == hwmon_curr_label) || 506 (type == hwmon_power && attr == hwmon_power_label) || 507 (type == hwmon_energy && attr == hwmon_energy_label) || 508 (type == hwmon_energy64 && attr == hwmon_energy_label) || 509 (type == hwmon_humidity && attr == hwmon_humidity_label) || 510 (type == hwmon_fan && attr == hwmon_fan_label); 511 } 512 513 static struct attribute *hwmon_genattr(const void *drvdata, 514 enum hwmon_sensor_types type, 515 u32 attr, 516 int index, 517 const char *template, 518 const struct hwmon_ops *ops) 519 { 520 struct hwmon_device_attribute *hattr; 521 struct device_attribute *dattr; 522 struct attribute *a; 523 umode_t mode; 524 const char *name; 525 bool is_string = is_string_attr(type, attr); 526 527 mode = hwmon_is_visible(ops, drvdata, type, attr, index); 528 if (!mode) 529 return ERR_PTR(-ENOENT); 530 531 if ((mode & 0444) && ((is_string && !ops->read_string) || 532 (!is_string && !ops->read))) 533 return ERR_PTR(-EINVAL); 534 if ((mode & 0222) && !ops->write) 535 return ERR_PTR(-EINVAL); 536 537 hattr = kzalloc_obj(*hattr); 538 if (!hattr) 539 return ERR_PTR(-ENOMEM); 540 541 if (type == hwmon_chip) { 542 name = template; 543 } else { 544 scnprintf(hattr->name, sizeof(hattr->name), template, 545 index + hwmon_attr_base(type)); 546 name = hattr->name; 547 } 548 549 hattr->type = type; 550 hattr->attr = attr; 551 hattr->index = index; 552 hattr->ops = ops; 553 554 dattr = &hattr->dev_attr; 555 dattr->show = is_string ? hwmon_attr_show_string : hwmon_attr_show; 556 dattr->store = hwmon_attr_store; 557 558 a = &dattr->attr; 559 sysfs_attr_init(a); 560 a->name = name; 561 a->mode = mode; 562 563 return a; 564 } 565 566 /* 567 * Chip attributes are not attribute templates but actual sysfs attributes. 568 * See hwmon_genattr() for special handling. 569 */ 570 static const char * const hwmon_chip_attrs[] = { 571 [hwmon_chip_temp_reset_history] = "temp_reset_history", 572 [hwmon_chip_in_reset_history] = "in_reset_history", 573 [hwmon_chip_curr_reset_history] = "curr_reset_history", 574 [hwmon_chip_power_reset_history] = "power_reset_history", 575 [hwmon_chip_update_interval] = "update_interval", 576 [hwmon_chip_update_interval_us] = "update_interval_us", 577 [hwmon_chip_alarms] = "alarms", 578 [hwmon_chip_samples] = "samples", 579 [hwmon_chip_curr_samples] = "curr_samples", 580 [hwmon_chip_in_samples] = "in_samples", 581 [hwmon_chip_power_samples] = "power_samples", 582 [hwmon_chip_temp_samples] = "temp_samples", 583 [hwmon_chip_beep_enable] = "beep_enable", 584 }; 585 586 static const char * const hwmon_temp_attr_templates[] = { 587 [hwmon_temp_enable] = "temp%d_enable", 588 [hwmon_temp_input] = "temp%d_input", 589 [hwmon_temp_type] = "temp%d_type", 590 [hwmon_temp_lcrit] = "temp%d_lcrit", 591 [hwmon_temp_lcrit_hyst] = "temp%d_lcrit_hyst", 592 [hwmon_temp_min] = "temp%d_min", 593 [hwmon_temp_min_hyst] = "temp%d_min_hyst", 594 [hwmon_temp_max] = "temp%d_max", 595 [hwmon_temp_max_hyst] = "temp%d_max_hyst", 596 [hwmon_temp_crit] = "temp%d_crit", 597 [hwmon_temp_crit_hyst] = "temp%d_crit_hyst", 598 [hwmon_temp_emergency] = "temp%d_emergency", 599 [hwmon_temp_emergency_hyst] = "temp%d_emergency_hyst", 600 [hwmon_temp_alarm] = "temp%d_alarm", 601 [hwmon_temp_lcrit_alarm] = "temp%d_lcrit_alarm", 602 [hwmon_temp_min_alarm] = "temp%d_min_alarm", 603 [hwmon_temp_max_alarm] = "temp%d_max_alarm", 604 [hwmon_temp_crit_alarm] = "temp%d_crit_alarm", 605 [hwmon_temp_emergency_alarm] = "temp%d_emergency_alarm", 606 [hwmon_temp_fault] = "temp%d_fault", 607 [hwmon_temp_offset] = "temp%d_offset", 608 [hwmon_temp_label] = "temp%d_label", 609 [hwmon_temp_lowest] = "temp%d_lowest", 610 [hwmon_temp_highest] = "temp%d_highest", 611 [hwmon_temp_reset_history] = "temp%d_reset_history", 612 [hwmon_temp_rated_min] = "temp%d_rated_min", 613 [hwmon_temp_rated_max] = "temp%d_rated_max", 614 [hwmon_temp_beep] = "temp%d_beep", 615 }; 616 617 static const char * const hwmon_in_attr_templates[] = { 618 [hwmon_in_enable] = "in%d_enable", 619 [hwmon_in_input] = "in%d_input", 620 [hwmon_in_min] = "in%d_min", 621 [hwmon_in_max] = "in%d_max", 622 [hwmon_in_lcrit] = "in%d_lcrit", 623 [hwmon_in_crit] = "in%d_crit", 624 [hwmon_in_average] = "in%d_average", 625 [hwmon_in_lowest] = "in%d_lowest", 626 [hwmon_in_highest] = "in%d_highest", 627 [hwmon_in_reset_history] = "in%d_reset_history", 628 [hwmon_in_label] = "in%d_label", 629 [hwmon_in_alarm] = "in%d_alarm", 630 [hwmon_in_min_alarm] = "in%d_min_alarm", 631 [hwmon_in_max_alarm] = "in%d_max_alarm", 632 [hwmon_in_lcrit_alarm] = "in%d_lcrit_alarm", 633 [hwmon_in_crit_alarm] = "in%d_crit_alarm", 634 [hwmon_in_rated_min] = "in%d_rated_min", 635 [hwmon_in_rated_max] = "in%d_rated_max", 636 [hwmon_in_beep] = "in%d_beep", 637 [hwmon_in_fault] = "in%d_fault", 638 }; 639 640 static const char * const hwmon_curr_attr_templates[] = { 641 [hwmon_curr_enable] = "curr%d_enable", 642 [hwmon_curr_input] = "curr%d_input", 643 [hwmon_curr_min] = "curr%d_min", 644 [hwmon_curr_max] = "curr%d_max", 645 [hwmon_curr_lcrit] = "curr%d_lcrit", 646 [hwmon_curr_crit] = "curr%d_crit", 647 [hwmon_curr_average] = "curr%d_average", 648 [hwmon_curr_lowest] = "curr%d_lowest", 649 [hwmon_curr_highest] = "curr%d_highest", 650 [hwmon_curr_reset_history] = "curr%d_reset_history", 651 [hwmon_curr_label] = "curr%d_label", 652 [hwmon_curr_alarm] = "curr%d_alarm", 653 [hwmon_curr_min_alarm] = "curr%d_min_alarm", 654 [hwmon_curr_max_alarm] = "curr%d_max_alarm", 655 [hwmon_curr_lcrit_alarm] = "curr%d_lcrit_alarm", 656 [hwmon_curr_crit_alarm] = "curr%d_crit_alarm", 657 [hwmon_curr_rated_min] = "curr%d_rated_min", 658 [hwmon_curr_rated_max] = "curr%d_rated_max", 659 [hwmon_curr_beep] = "curr%d_beep", 660 }; 661 662 static const char * const hwmon_power_attr_templates[] = { 663 [hwmon_power_enable] = "power%d_enable", 664 [hwmon_power_average] = "power%d_average", 665 [hwmon_power_average_interval] = "power%d_average_interval", 666 [hwmon_power_average_interval_max] = "power%d_average_interval_max", 667 [hwmon_power_average_interval_min] = "power%d_average_interval_min", 668 [hwmon_power_average_highest] = "power%d_average_highest", 669 [hwmon_power_average_lowest] = "power%d_average_lowest", 670 [hwmon_power_average_max] = "power%d_average_max", 671 [hwmon_power_average_min] = "power%d_average_min", 672 [hwmon_power_input] = "power%d_input", 673 [hwmon_power_input_highest] = "power%d_input_highest", 674 [hwmon_power_input_lowest] = "power%d_input_lowest", 675 [hwmon_power_reset_history] = "power%d_reset_history", 676 [hwmon_power_accuracy] = "power%d_accuracy", 677 [hwmon_power_cap] = "power%d_cap", 678 [hwmon_power_cap_hyst] = "power%d_cap_hyst", 679 [hwmon_power_cap_max] = "power%d_cap_max", 680 [hwmon_power_cap_min] = "power%d_cap_min", 681 [hwmon_power_min] = "power%d_min", 682 [hwmon_power_max] = "power%d_max", 683 [hwmon_power_lcrit] = "power%d_lcrit", 684 [hwmon_power_crit] = "power%d_crit", 685 [hwmon_power_label] = "power%d_label", 686 [hwmon_power_alarm] = "power%d_alarm", 687 [hwmon_power_cap_alarm] = "power%d_cap_alarm", 688 [hwmon_power_min_alarm] = "power%d_min_alarm", 689 [hwmon_power_max_alarm] = "power%d_max_alarm", 690 [hwmon_power_lcrit_alarm] = "power%d_lcrit_alarm", 691 [hwmon_power_crit_alarm] = "power%d_crit_alarm", 692 [hwmon_power_rated_min] = "power%d_rated_min", 693 [hwmon_power_rated_max] = "power%d_rated_max", 694 }; 695 696 static const char * const hwmon_energy_attr_templates[] = { 697 [hwmon_energy_enable] = "energy%d_enable", 698 [hwmon_energy_input] = "energy%d_input", 699 [hwmon_energy_label] = "energy%d_label", 700 }; 701 702 static const char * const hwmon_humidity_attr_templates[] = { 703 [hwmon_humidity_enable] = "humidity%d_enable", 704 [hwmon_humidity_input] = "humidity%d_input", 705 [hwmon_humidity_label] = "humidity%d_label", 706 [hwmon_humidity_min] = "humidity%d_min", 707 [hwmon_humidity_min_hyst] = "humidity%d_min_hyst", 708 [hwmon_humidity_max] = "humidity%d_max", 709 [hwmon_humidity_max_hyst] = "humidity%d_max_hyst", 710 [hwmon_humidity_alarm] = "humidity%d_alarm", 711 [hwmon_humidity_fault] = "humidity%d_fault", 712 [hwmon_humidity_rated_min] = "humidity%d_rated_min", 713 [hwmon_humidity_rated_max] = "humidity%d_rated_max", 714 [hwmon_humidity_min_alarm] = "humidity%d_min_alarm", 715 [hwmon_humidity_max_alarm] = "humidity%d_max_alarm", 716 }; 717 718 static const char * const hwmon_fan_attr_templates[] = { 719 [hwmon_fan_enable] = "fan%d_enable", 720 [hwmon_fan_input] = "fan%d_input", 721 [hwmon_fan_label] = "fan%d_label", 722 [hwmon_fan_min] = "fan%d_min", 723 [hwmon_fan_max] = "fan%d_max", 724 [hwmon_fan_div] = "fan%d_div", 725 [hwmon_fan_pulses] = "fan%d_pulses", 726 [hwmon_fan_target] = "fan%d_target", 727 [hwmon_fan_alarm] = "fan%d_alarm", 728 [hwmon_fan_min_alarm] = "fan%d_min_alarm", 729 [hwmon_fan_max_alarm] = "fan%d_max_alarm", 730 [hwmon_fan_fault] = "fan%d_fault", 731 [hwmon_fan_beep] = "fan%d_beep", 732 }; 733 734 static const char * const hwmon_pwm_attr_templates[] = { 735 [hwmon_pwm_input] = "pwm%d", 736 [hwmon_pwm_enable] = "pwm%d_enable", 737 [hwmon_pwm_mode] = "pwm%d_mode", 738 [hwmon_pwm_freq] = "pwm%d_freq", 739 [hwmon_pwm_auto_channels_temp] = "pwm%d_auto_channels_temp", 740 }; 741 742 static const char * const hwmon_intrusion_attr_templates[] = { 743 [hwmon_intrusion_alarm] = "intrusion%d_alarm", 744 [hwmon_intrusion_beep] = "intrusion%d_beep", 745 }; 746 747 static const char * const *__templates[] = { 748 [hwmon_chip] = hwmon_chip_attrs, 749 [hwmon_temp] = hwmon_temp_attr_templates, 750 [hwmon_in] = hwmon_in_attr_templates, 751 [hwmon_curr] = hwmon_curr_attr_templates, 752 [hwmon_power] = hwmon_power_attr_templates, 753 [hwmon_energy] = hwmon_energy_attr_templates, 754 [hwmon_energy64] = hwmon_energy_attr_templates, 755 [hwmon_humidity] = hwmon_humidity_attr_templates, 756 [hwmon_fan] = hwmon_fan_attr_templates, 757 [hwmon_pwm] = hwmon_pwm_attr_templates, 758 [hwmon_intrusion] = hwmon_intrusion_attr_templates, 759 }; 760 761 static const int __templates_size[] = { 762 [hwmon_chip] = ARRAY_SIZE(hwmon_chip_attrs), 763 [hwmon_temp] = ARRAY_SIZE(hwmon_temp_attr_templates), 764 [hwmon_in] = ARRAY_SIZE(hwmon_in_attr_templates), 765 [hwmon_curr] = ARRAY_SIZE(hwmon_curr_attr_templates), 766 [hwmon_power] = ARRAY_SIZE(hwmon_power_attr_templates), 767 [hwmon_energy] = ARRAY_SIZE(hwmon_energy_attr_templates), 768 [hwmon_energy64] = ARRAY_SIZE(hwmon_energy_attr_templates), 769 [hwmon_humidity] = ARRAY_SIZE(hwmon_humidity_attr_templates), 770 [hwmon_fan] = ARRAY_SIZE(hwmon_fan_attr_templates), 771 [hwmon_pwm] = ARRAY_SIZE(hwmon_pwm_attr_templates), 772 [hwmon_intrusion] = ARRAY_SIZE(hwmon_intrusion_attr_templates), 773 }; 774 775 int hwmon_notify_event(struct device *dev, enum hwmon_sensor_types type, 776 u32 attr, int channel) 777 { 778 char event[MAX_SYSFS_ATTR_NAME_LENGTH + 5]; 779 char sattr[MAX_SYSFS_ATTR_NAME_LENGTH]; 780 char *envp[] = { event, NULL }; 781 const char * const *templates; 782 const char *template; 783 int base; 784 785 if (type >= ARRAY_SIZE(__templates)) 786 return -EINVAL; 787 if (attr >= __templates_size[type]) 788 return -EINVAL; 789 790 templates = __templates[type]; 791 template = templates[attr]; 792 793 base = hwmon_attr_base(type); 794 795 scnprintf(sattr, MAX_SYSFS_ATTR_NAME_LENGTH, template, base + channel); 796 scnprintf(event, sizeof(event), "NAME=%s", sattr); 797 sysfs_notify(&dev->kobj, NULL, sattr); 798 kobject_uevent_env(&dev->kobj, KOBJ_CHANGE, envp); 799 800 if (type == hwmon_temp) 801 hwmon_thermal_notify(dev, channel); 802 803 return 0; 804 } 805 EXPORT_SYMBOL_GPL(hwmon_notify_event); 806 807 void hwmon_lock(struct device *dev) 808 { 809 struct hwmon_device *hwdev = to_hwmon_device(dev); 810 811 mutex_lock(&hwdev->lock); 812 } 813 EXPORT_SYMBOL_GPL(hwmon_lock); 814 815 void hwmon_unlock(struct device *dev) 816 { 817 struct hwmon_device *hwdev = to_hwmon_device(dev); 818 819 mutex_unlock(&hwdev->lock); 820 } 821 EXPORT_SYMBOL_GPL(hwmon_unlock); 822 823 static int hwmon_num_channel_attrs(const struct hwmon_channel_info *info) 824 { 825 int i, n; 826 827 for (i = n = 0; info->config[i]; i++) 828 n += hweight32(info->config[i]); 829 830 return n; 831 } 832 833 static int hwmon_genattrs(const void *drvdata, 834 struct attribute **attrs, 835 const struct hwmon_ops *ops, 836 const struct hwmon_channel_info *info) 837 { 838 const char * const *templates; 839 int template_size; 840 int i, aindex = 0; 841 842 if (info->type >= ARRAY_SIZE(__templates)) 843 return -EINVAL; 844 845 templates = __templates[info->type]; 846 template_size = __templates_size[info->type]; 847 848 for (i = 0; info->config[i]; i++) { 849 u32 attr_mask = info->config[i]; 850 u32 attr; 851 852 while (attr_mask) { 853 struct attribute *a; 854 855 attr = __ffs(attr_mask); 856 attr_mask &= ~BIT(attr); 857 if (attr >= template_size || !templates[attr]) 858 continue; /* attribute is invisible */ 859 a = hwmon_genattr(drvdata, info->type, attr, i, 860 templates[attr], ops); 861 if (IS_ERR(a)) { 862 if (PTR_ERR(a) != -ENOENT) 863 return PTR_ERR(a); 864 continue; 865 } 866 attrs[aindex++] = a; 867 } 868 } 869 return aindex; 870 } 871 872 static struct attribute ** 873 __hwmon_create_attrs(const void *drvdata, const struct hwmon_chip_info *chip) 874 { 875 int ret, i, aindex = 0, nattrs = 0; 876 struct attribute **attrs; 877 878 for (i = 0; chip->info[i]; i++) 879 nattrs += hwmon_num_channel_attrs(chip->info[i]); 880 881 if (nattrs == 0) 882 return ERR_PTR(-EINVAL); 883 884 attrs = kzalloc_objs(*attrs, nattrs + 1); 885 if (!attrs) 886 return ERR_PTR(-ENOMEM); 887 888 for (i = 0; chip->info[i]; i++) { 889 ret = hwmon_genattrs(drvdata, &attrs[aindex], chip->ops, 890 chip->info[i]); 891 if (ret < 0) { 892 hwmon_free_attrs(attrs); 893 return ERR_PTR(ret); 894 } 895 aindex += ret; 896 } 897 898 return attrs; 899 } 900 901 static struct device * 902 __hwmon_device_register(struct device *dev, const char *name, void *drvdata, 903 const struct hwmon_chip_info *chip, 904 const struct attribute_group **groups) 905 { 906 struct hwmon_device *hwdev; 907 const char *label; 908 struct device *hdev; 909 struct device *tdev = dev; 910 int i, err, id; 911 912 /* Complain about invalid characters in hwmon name attribute */ 913 if (name && (!strlen(name) || strpbrk(name, "-* \t\n"))) 914 dev_warn(dev, 915 "hwmon: '%s' is not a valid name attribute, please fix\n", 916 name); 917 918 id = ida_alloc(&hwmon_ida, GFP_KERNEL); 919 if (id < 0) 920 return ERR_PTR(id); 921 922 hwdev = kzalloc_obj(*hwdev); 923 if (hwdev == NULL) { 924 err = -ENOMEM; 925 goto ida_remove; 926 } 927 928 hdev = &hwdev->dev; 929 930 if (chip) { 931 struct attribute **attrs; 932 int ngroups = 2; /* terminating NULL plus &hwdev->groups */ 933 934 if (groups) 935 for (i = 0; groups[i]; i++) 936 ngroups++; 937 938 hwdev->groups = kzalloc_objs(*groups, ngroups); 939 if (!hwdev->groups) { 940 err = -ENOMEM; 941 goto free_hwmon; 942 } 943 944 attrs = __hwmon_create_attrs(drvdata, chip); 945 if (IS_ERR(attrs)) { 946 err = PTR_ERR(attrs); 947 goto free_hwmon; 948 } 949 950 hwdev->group.attrs = attrs; 951 ngroups = 0; 952 hwdev->groups[ngroups++] = &hwdev->group; 953 954 if (groups) { 955 for (i = 0; groups[i]; i++) 956 hwdev->groups[ngroups++] = groups[i]; 957 } 958 959 hdev->groups = hwdev->groups; 960 } else { 961 hdev->groups = groups; 962 } 963 964 if (dev && device_property_present(dev, "label")) { 965 err = device_property_read_string(dev, "label", &label); 966 if (err < 0) 967 goto free_hwmon; 968 969 hwdev->label = kstrdup(label, GFP_KERNEL); 970 if (hwdev->label == NULL) { 971 err = -ENOMEM; 972 goto free_hwmon; 973 } 974 } 975 976 hwdev->name = name; 977 hdev->class = &hwmon_class; 978 hdev->parent = dev; 979 while (tdev && !tdev->of_node) 980 tdev = tdev->parent; 981 hdev->of_node = tdev ? tdev->of_node : NULL; 982 hwdev->chip = chip; 983 mutex_init(&hwdev->lock); 984 dev_set_drvdata(hdev, drvdata); 985 dev_set_name(hdev, HWMON_ID_FORMAT, id); 986 err = device_register(hdev); 987 if (err) { 988 put_device(hdev); 989 goto ida_remove; 990 } 991 992 INIT_LIST_HEAD(&hwdev->tzdata); 993 994 if (hdev->of_node && chip && chip->ops->read && 995 chip->info[0]->type == hwmon_chip) { 996 u32 config = chip->info[0]->config[0]; 997 998 if (config & HWMON_C_REGISTER_TZ) { 999 err = hwmon_thermal_register_sensors(hdev); 1000 if (err) { 1001 device_unregister(hdev); 1002 /* 1003 * Don't worry about hwdev; hwmon_dev_release(), 1004 * called from device_unregister(), will free it. 1005 */ 1006 goto ida_remove; 1007 } 1008 } 1009 if (config & HWMON_C_PEC) { 1010 err = hwmon_pec_register(hdev); 1011 if (err) { 1012 device_unregister(hdev); 1013 goto ida_remove; 1014 } 1015 } 1016 } 1017 1018 return hdev; 1019 1020 free_hwmon: 1021 hwmon_dev_release(hdev); 1022 ida_remove: 1023 ida_free(&hwmon_ida, id); 1024 return ERR_PTR(err); 1025 } 1026 1027 /** 1028 * hwmon_device_register_with_groups - register w/ hwmon 1029 * @dev: the parent device 1030 * @name: hwmon name attribute 1031 * @drvdata: driver data to attach to created device 1032 * @groups: List of attribute groups to create 1033 * 1034 * hwmon_device_unregister() must be called when the device is no 1035 * longer needed. 1036 * 1037 * Returns the pointer to the new device. 1038 */ 1039 struct device * 1040 hwmon_device_register_with_groups(struct device *dev, const char *name, 1041 void *drvdata, 1042 const struct attribute_group **groups) 1043 { 1044 if (!name) 1045 return ERR_PTR(-EINVAL); 1046 1047 return __hwmon_device_register(dev, name, drvdata, NULL, groups); 1048 } 1049 EXPORT_SYMBOL_GPL(hwmon_device_register_with_groups); 1050 1051 /** 1052 * hwmon_device_register_with_info - register w/ hwmon 1053 * @dev: the parent device (mandatory) 1054 * @name: hwmon name attribute (mandatory) 1055 * @drvdata: driver data to attach to created device (optional) 1056 * @chip: pointer to hwmon chip information (mandatory) 1057 * @extra_groups: pointer to list of additional non-standard attribute groups 1058 * (optional) 1059 * 1060 * hwmon_device_unregister() must be called when the device is no 1061 * longer needed. 1062 * 1063 * Returns the pointer to the new device. 1064 */ 1065 struct device * 1066 hwmon_device_register_with_info(struct device *dev, const char *name, 1067 void *drvdata, 1068 const struct hwmon_chip_info *chip, 1069 const struct attribute_group **extra_groups) 1070 { 1071 if (!dev || !name || !chip) 1072 return ERR_PTR(-EINVAL); 1073 1074 if (!chip->ops || !(chip->ops->visible || chip->ops->is_visible) || !chip->info) 1075 return ERR_PTR(-EINVAL); 1076 1077 return __hwmon_device_register(dev, name, drvdata, chip, extra_groups); 1078 } 1079 EXPORT_SYMBOL_GPL(hwmon_device_register_with_info); 1080 1081 /** 1082 * hwmon_device_register_for_thermal - register hwmon device for thermal subsystem 1083 * @dev: the parent device 1084 * @name: hwmon name attribute 1085 * @drvdata: driver data to attach to created device 1086 * @extra_groups: pointer to list of additional non-standard attribute groups 1087 * 1088 * The use of this function is restricted. It is provided for legacy reasons 1089 * and must only be called from the thermal subsystem. 1090 * 1091 * hwmon_device_unregister() must be called when the device is no 1092 * longer needed. 1093 * 1094 * Returns the pointer to the new device. 1095 */ 1096 struct device * 1097 hwmon_device_register_for_thermal(struct device *dev, const char *name, 1098 void *drvdata, 1099 const struct attribute_group **extra_groups) 1100 { 1101 if (!name || !dev) 1102 return ERR_PTR(-EINVAL); 1103 1104 return __hwmon_device_register(dev, name, drvdata, NULL, extra_groups); 1105 } 1106 EXPORT_SYMBOL_NS_GPL(hwmon_device_register_for_thermal, "HWMON_THERMAL"); 1107 1108 /** 1109 * hwmon_device_register - register w/ hwmon 1110 * @dev: the device to register 1111 * 1112 * hwmon_device_unregister() must be called when the device is no 1113 * longer needed. 1114 * 1115 * Returns the pointer to the new device. 1116 */ 1117 struct device *hwmon_device_register(struct device *dev) 1118 { 1119 dev_warn(dev, 1120 "hwmon_device_register() is deprecated. Please convert the driver to use hwmon_device_register_with_info().\n"); 1121 1122 return __hwmon_device_register(dev, NULL, NULL, NULL, NULL); 1123 } 1124 EXPORT_SYMBOL_GPL(hwmon_device_register); 1125 1126 /** 1127 * hwmon_device_unregister - removes the previously registered class device 1128 * 1129 * @dev: the class device to destroy 1130 */ 1131 void hwmon_device_unregister(struct device *dev) 1132 { 1133 int id; 1134 1135 if (likely(sscanf(dev_name(dev), HWMON_ID_FORMAT, &id) == 1)) { 1136 device_unregister(dev); 1137 ida_free(&hwmon_ida, id); 1138 } else 1139 dev_dbg(dev->parent, 1140 "hwmon_device_unregister() failed: bad class ID!\n"); 1141 } 1142 EXPORT_SYMBOL_GPL(hwmon_device_unregister); 1143 1144 static void devm_hwmon_release(struct device *dev, void *res) 1145 { 1146 struct device *hwdev = *(struct device **)res; 1147 1148 hwmon_device_unregister(hwdev); 1149 } 1150 1151 /** 1152 * devm_hwmon_device_register_with_groups - register w/ hwmon 1153 * @dev: the parent device 1154 * @name: hwmon name attribute 1155 * @drvdata: driver data to attach to created device 1156 * @groups: List of attribute groups to create 1157 * 1158 * Returns the pointer to the new device. The new device is automatically 1159 * unregistered with the parent device. 1160 */ 1161 struct device * 1162 devm_hwmon_device_register_with_groups(struct device *dev, const char *name, 1163 void *drvdata, 1164 const struct attribute_group **groups) 1165 { 1166 struct device **ptr, *hwdev; 1167 1168 if (!dev) 1169 return ERR_PTR(-EINVAL); 1170 1171 ptr = devres_alloc(devm_hwmon_release, sizeof(*ptr), GFP_KERNEL); 1172 if (!ptr) 1173 return ERR_PTR(-ENOMEM); 1174 1175 hwdev = hwmon_device_register_with_groups(dev, name, drvdata, groups); 1176 if (IS_ERR(hwdev)) 1177 goto error; 1178 1179 *ptr = hwdev; 1180 devres_add(dev, ptr); 1181 return hwdev; 1182 1183 error: 1184 devres_free(ptr); 1185 return hwdev; 1186 } 1187 EXPORT_SYMBOL_GPL(devm_hwmon_device_register_with_groups); 1188 1189 /** 1190 * devm_hwmon_device_register_with_info - register w/ hwmon 1191 * @dev: the parent device 1192 * @name: hwmon name attribute 1193 * @drvdata: driver data to attach to created device 1194 * @chip: pointer to hwmon chip information 1195 * @extra_groups: pointer to list of driver specific attribute groups 1196 * 1197 * Returns the pointer to the new device. The new device is automatically 1198 * unregistered with the parent device. 1199 */ 1200 struct device * 1201 devm_hwmon_device_register_with_info(struct device *dev, const char *name, 1202 void *drvdata, 1203 const struct hwmon_chip_info *chip, 1204 const struct attribute_group **extra_groups) 1205 { 1206 struct device **ptr, *hwdev; 1207 1208 if (!dev) 1209 return ERR_PTR(-EINVAL); 1210 1211 if (!name) { 1212 name = devm_hwmon_sanitize_name(dev, dev_name(dev)); 1213 if (IS_ERR(name)) 1214 return ERR_CAST(name); 1215 } 1216 1217 ptr = devres_alloc(devm_hwmon_release, sizeof(*ptr), GFP_KERNEL); 1218 if (!ptr) 1219 return ERR_PTR(-ENOMEM); 1220 1221 hwdev = hwmon_device_register_with_info(dev, name, drvdata, chip, 1222 extra_groups); 1223 if (IS_ERR(hwdev)) 1224 goto error; 1225 1226 *ptr = hwdev; 1227 devres_add(dev, ptr); 1228 1229 return hwdev; 1230 1231 error: 1232 devres_free(ptr); 1233 return hwdev; 1234 } 1235 EXPORT_SYMBOL_GPL(devm_hwmon_device_register_with_info); 1236 1237 static char *__hwmon_sanitize_name(struct device *dev, const char *old_name) 1238 { 1239 char *name, *p; 1240 1241 if (dev) 1242 name = devm_kstrdup(dev, old_name, GFP_KERNEL); 1243 else 1244 name = kstrdup(old_name, GFP_KERNEL); 1245 if (!name) 1246 return ERR_PTR(-ENOMEM); 1247 1248 for (p = name; *p; p++) 1249 if (hwmon_is_bad_char(*p)) 1250 *p = '_'; 1251 1252 return name; 1253 } 1254 1255 /** 1256 * hwmon_sanitize_name - Replaces invalid characters in a hwmon name 1257 * @name: NUL-terminated name 1258 * 1259 * Allocates a new string where any invalid characters will be replaced 1260 * by an underscore. It is the responsibility of the caller to release 1261 * the memory. 1262 * 1263 * Returns newly allocated name, or ERR_PTR on error. 1264 */ 1265 char *hwmon_sanitize_name(const char *name) 1266 { 1267 if (!name) 1268 return ERR_PTR(-EINVAL); 1269 1270 return __hwmon_sanitize_name(NULL, name); 1271 } 1272 EXPORT_SYMBOL_GPL(hwmon_sanitize_name); 1273 1274 /** 1275 * devm_hwmon_sanitize_name - resource managed hwmon_sanitize_name() 1276 * @dev: device to allocate memory for 1277 * @name: NUL-terminated name 1278 * 1279 * Allocates a new string where any invalid characters will be replaced 1280 * by an underscore. 1281 * 1282 * Returns newly allocated name, or ERR_PTR on error. 1283 */ 1284 char *devm_hwmon_sanitize_name(struct device *dev, const char *name) 1285 { 1286 if (!dev || !name) 1287 return ERR_PTR(-EINVAL); 1288 1289 return __hwmon_sanitize_name(dev, name); 1290 } 1291 EXPORT_SYMBOL_GPL(devm_hwmon_sanitize_name); 1292 1293 static void __init hwmon_pci_quirks(void) 1294 { 1295 #if defined CONFIG_X86 && defined CONFIG_PCI 1296 struct pci_dev *sb; 1297 u16 base; 1298 u8 enable; 1299 1300 /* Open access to 0x295-0x296 on MSI MS-7031 */ 1301 sb = pci_get_device(PCI_VENDOR_ID_ATI, 0x436c, NULL); 1302 if (sb) { 1303 if (sb->subsystem_vendor == 0x1462 && /* MSI */ 1304 sb->subsystem_device == 0x0031) { /* MS-7031 */ 1305 pci_read_config_byte(sb, 0x48, &enable); 1306 pci_read_config_word(sb, 0x64, &base); 1307 1308 if (base == 0 && !(enable & BIT(2))) { 1309 dev_info(&sb->dev, 1310 "Opening wide generic port at 0x295\n"); 1311 pci_write_config_word(sb, 0x64, 0x295); 1312 pci_write_config_byte(sb, 0x48, 1313 enable | BIT(2)); 1314 } 1315 } 1316 pci_dev_put(sb); 1317 } 1318 #endif 1319 } 1320 1321 static int __init hwmon_init(void) 1322 { 1323 int err; 1324 1325 hwmon_pci_quirks(); 1326 1327 err = class_register(&hwmon_class); 1328 if (err) { 1329 pr_err("couldn't register hwmon sysfs class\n"); 1330 return err; 1331 } 1332 return 0; 1333 } 1334 1335 static void __exit hwmon_exit(void) 1336 { 1337 class_unregister(&hwmon_class); 1338 } 1339 1340 subsys_initcall(hwmon_init); 1341 module_exit(hwmon_exit); 1342 1343 MODULE_AUTHOR("Mark M. Hoffman <mhoffman@lightlink.com>"); 1344 MODULE_DESCRIPTION("hardware monitoring sysfs/class support"); 1345 MODULE_LICENSE("GPL"); 1346 1347