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