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