1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * hwmon.c - part of lm_sensors, Linux kernel modules for hardware monitoring 4 * 5 * This file defines the sysfs class "hwmon", for use by sensors drivers. 6 * 7 * Copyright (C) 2005 Mark M. Hoffman <mhoffman@lightlink.com> 8 */ 9 10 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 11 12 #include <linux/bitops.h> 13 #include <linux/device.h> 14 #include <linux/err.h> 15 #include <linux/gfp.h> 16 #include <linux/hwmon.h> 17 #include <linux/idr.h> 18 #include <linux/list.h> 19 #include <linux/module.h> 20 #include <linux/pci.h> 21 #include <linux/slab.h> 22 #include <linux/string.h> 23 #include <linux/thermal.h> 24 25 #define CREATE_TRACE_POINTS 26 #include <trace/events/hwmon.h> 27 28 #define HWMON_ID_PREFIX "hwmon" 29 #define HWMON_ID_FORMAT HWMON_ID_PREFIX "%d" 30 31 struct hwmon_device { 32 const char *name; 33 struct device dev; 34 const struct hwmon_chip_info *chip; 35 struct list_head tzdata; 36 struct attribute_group group; 37 const struct attribute_group **groups; 38 }; 39 40 #define to_hwmon_device(d) container_of(d, struct hwmon_device, dev) 41 42 #define MAX_SYSFS_ATTR_NAME_LENGTH 32 43 44 struct hwmon_device_attribute { 45 struct device_attribute dev_attr; 46 const struct hwmon_ops *ops; 47 enum hwmon_sensor_types type; 48 u32 attr; 49 int index; 50 char name[MAX_SYSFS_ATTR_NAME_LENGTH]; 51 }; 52 53 #define to_hwmon_attr(d) \ 54 container_of(d, struct hwmon_device_attribute, dev_attr) 55 #define to_dev_attr(a) container_of(a, struct device_attribute, attr) 56 57 /* 58 * Thermal zone information 59 */ 60 struct hwmon_thermal_data { 61 struct list_head node; /* hwmon tzdata list entry */ 62 struct device *dev; /* Reference to hwmon device */ 63 int index; /* sensor index */ 64 struct thermal_zone_device *tzd;/* thermal zone device */ 65 }; 66 67 static ssize_t 68 name_show(struct device *dev, struct device_attribute *attr, char *buf) 69 { 70 return sprintf(buf, "%s\n", to_hwmon_device(dev)->name); 71 } 72 static DEVICE_ATTR_RO(name); 73 74 static struct attribute *hwmon_dev_attrs[] = { 75 &dev_attr_name.attr, 76 NULL 77 }; 78 79 static umode_t hwmon_dev_name_is_visible(struct kobject *kobj, 80 struct attribute *attr, int n) 81 { 82 struct device *dev = kobj_to_dev(kobj); 83 84 if (to_hwmon_device(dev)->name == NULL) 85 return 0; 86 87 return attr->mode; 88 } 89 90 static const struct attribute_group hwmon_dev_attr_group = { 91 .attrs = hwmon_dev_attrs, 92 .is_visible = hwmon_dev_name_is_visible, 93 }; 94 95 static const struct attribute_group *hwmon_dev_attr_groups[] = { 96 &hwmon_dev_attr_group, 97 NULL 98 }; 99 100 static void hwmon_free_attrs(struct attribute **attrs) 101 { 102 int i; 103 104 for (i = 0; attrs[i]; i++) { 105 struct device_attribute *dattr = to_dev_attr(attrs[i]); 106 struct hwmon_device_attribute *hattr = to_hwmon_attr(dattr); 107 108 kfree(hattr); 109 } 110 kfree(attrs); 111 } 112 113 static void hwmon_dev_release(struct device *dev) 114 { 115 struct hwmon_device *hwdev = to_hwmon_device(dev); 116 117 if (hwdev->group.attrs) 118 hwmon_free_attrs(hwdev->group.attrs); 119 kfree(hwdev->groups); 120 kfree(hwdev); 121 } 122 123 static struct class hwmon_class = { 124 .name = "hwmon", 125 .owner = THIS_MODULE, 126 .dev_groups = hwmon_dev_attr_groups, 127 .dev_release = hwmon_dev_release, 128 }; 129 130 static DEFINE_IDA(hwmon_ida); 131 132 /* Thermal zone handling */ 133 134 /* 135 * The complex conditional is necessary to avoid a cyclic dependency 136 * between hwmon and thermal_sys modules. 137 */ 138 #ifdef CONFIG_THERMAL_OF 139 static int hwmon_thermal_get_temp(void *data, int *temp) 140 { 141 struct hwmon_thermal_data *tdata = data; 142 struct hwmon_device *hwdev = to_hwmon_device(tdata->dev); 143 int ret; 144 long t; 145 146 ret = hwdev->chip->ops->read(tdata->dev, hwmon_temp, hwmon_temp_input, 147 tdata->index, &t); 148 if (ret < 0) 149 return ret; 150 151 *temp = t; 152 153 return 0; 154 } 155 156 static int hwmon_thermal_set_trips(void *data, int low, int high) 157 { 158 struct hwmon_thermal_data *tdata = data; 159 struct hwmon_device *hwdev = to_hwmon_device(tdata->dev); 160 const struct hwmon_chip_info *chip = hwdev->chip; 161 const struct hwmon_channel_info **info = chip->info; 162 unsigned int i; 163 int err; 164 165 if (!chip->ops->write) 166 return 0; 167 168 for (i = 0; info[i] && info[i]->type != hwmon_temp; i++) 169 continue; 170 171 if (!info[i]) 172 return 0; 173 174 if (info[i]->config[tdata->index] & HWMON_T_MIN) { 175 err = chip->ops->write(tdata->dev, hwmon_temp, 176 hwmon_temp_min, tdata->index, low); 177 if (err && err != -EOPNOTSUPP) 178 return err; 179 } 180 181 if (info[i]->config[tdata->index] & HWMON_T_MAX) { 182 err = chip->ops->write(tdata->dev, hwmon_temp, 183 hwmon_temp_max, tdata->index, high); 184 if (err && err != -EOPNOTSUPP) 185 return err; 186 } 187 188 return 0; 189 } 190 191 static const struct thermal_zone_of_device_ops hwmon_thermal_ops = { 192 .get_temp = hwmon_thermal_get_temp, 193 .set_trips = hwmon_thermal_set_trips, 194 }; 195 196 static void hwmon_thermal_remove_sensor(void *data) 197 { 198 list_del(data); 199 } 200 201 static int hwmon_thermal_add_sensor(struct device *dev, int index) 202 { 203 struct hwmon_device *hwdev = to_hwmon_device(dev); 204 struct hwmon_thermal_data *tdata; 205 struct thermal_zone_device *tzd; 206 int err; 207 208 tdata = devm_kzalloc(dev, sizeof(*tdata), GFP_KERNEL); 209 if (!tdata) 210 return -ENOMEM; 211 212 tdata->dev = dev; 213 tdata->index = index; 214 215 tzd = devm_thermal_zone_of_sensor_register(dev, index, tdata, 216 &hwmon_thermal_ops); 217 /* 218 * If CONFIG_THERMAL_OF is disabled, this returns -ENODEV, 219 * so ignore that error but forward any other error. 220 */ 221 if (IS_ERR(tzd) && (PTR_ERR(tzd) != -ENODEV)) 222 return PTR_ERR(tzd); 223 224 err = devm_add_action(dev, hwmon_thermal_remove_sensor, &tdata->node); 225 if (err) 226 return err; 227 228 tdata->tzd = tzd; 229 list_add(&tdata->node, &hwdev->tzdata); 230 231 return 0; 232 } 233 234 static int hwmon_thermal_register_sensors(struct device *dev) 235 { 236 struct hwmon_device *hwdev = to_hwmon_device(dev); 237 const struct hwmon_chip_info *chip = hwdev->chip; 238 const struct hwmon_channel_info **info = chip->info; 239 void *drvdata = dev_get_drvdata(dev); 240 int i; 241 242 for (i = 1; info[i]; i++) { 243 int j; 244 245 if (info[i]->type != hwmon_temp) 246 continue; 247 248 for (j = 0; info[i]->config[j]; j++) { 249 int err; 250 251 if (!(info[i]->config[j] & HWMON_T_INPUT) || 252 !chip->ops->is_visible(drvdata, hwmon_temp, 253 hwmon_temp_input, j)) 254 continue; 255 256 err = hwmon_thermal_add_sensor(dev, j); 257 if (err) 258 return err; 259 } 260 } 261 262 return 0; 263 } 264 265 static void hwmon_thermal_notify(struct device *dev, int index) 266 { 267 struct hwmon_device *hwdev = to_hwmon_device(dev); 268 struct hwmon_thermal_data *tzdata; 269 270 list_for_each_entry(tzdata, &hwdev->tzdata, node) { 271 if (tzdata->index == index) { 272 thermal_zone_device_update(tzdata->tzd, 273 THERMAL_EVENT_UNSPECIFIED); 274 } 275 } 276 } 277 278 #else 279 static int hwmon_thermal_register_sensors(struct device *dev) 280 { 281 return 0; 282 } 283 284 static void hwmon_thermal_notify(struct device *dev, int index) { } 285 286 #endif /* IS_REACHABLE(CONFIG_THERMAL) && ... */ 287 288 static int hwmon_attr_base(enum hwmon_sensor_types type) 289 { 290 if (type == hwmon_in || type == hwmon_intrusion) 291 return 0; 292 return 1; 293 } 294 295 /* sysfs attribute management */ 296 297 static ssize_t hwmon_attr_show(struct device *dev, 298 struct device_attribute *devattr, char *buf) 299 { 300 struct hwmon_device_attribute *hattr = to_hwmon_attr(devattr); 301 long val; 302 int ret; 303 304 ret = hattr->ops->read(dev, hattr->type, hattr->attr, hattr->index, 305 &val); 306 if (ret < 0) 307 return ret; 308 309 trace_hwmon_attr_show(hattr->index + hwmon_attr_base(hattr->type), 310 hattr->name, val); 311 312 return sprintf(buf, "%ld\n", val); 313 } 314 315 static ssize_t hwmon_attr_show_string(struct device *dev, 316 struct device_attribute *devattr, 317 char *buf) 318 { 319 struct hwmon_device_attribute *hattr = to_hwmon_attr(devattr); 320 enum hwmon_sensor_types type = hattr->type; 321 const char *s; 322 int ret; 323 324 ret = hattr->ops->read_string(dev, hattr->type, hattr->attr, 325 hattr->index, &s); 326 if (ret < 0) 327 return ret; 328 329 trace_hwmon_attr_show_string(hattr->index + hwmon_attr_base(type), 330 hattr->name, s); 331 332 return sprintf(buf, "%s\n", s); 333 } 334 335 static ssize_t hwmon_attr_store(struct device *dev, 336 struct device_attribute *devattr, 337 const char *buf, size_t count) 338 { 339 struct hwmon_device_attribute *hattr = to_hwmon_attr(devattr); 340 long val; 341 int ret; 342 343 ret = kstrtol(buf, 10, &val); 344 if (ret < 0) 345 return ret; 346 347 ret = hattr->ops->write(dev, hattr->type, hattr->attr, hattr->index, 348 val); 349 if (ret < 0) 350 return ret; 351 352 trace_hwmon_attr_store(hattr->index + hwmon_attr_base(hattr->type), 353 hattr->name, val); 354 355 return count; 356 } 357 358 static bool is_string_attr(enum hwmon_sensor_types type, u32 attr) 359 { 360 return (type == hwmon_temp && attr == hwmon_temp_label) || 361 (type == hwmon_in && attr == hwmon_in_label) || 362 (type == hwmon_curr && attr == hwmon_curr_label) || 363 (type == hwmon_power && attr == hwmon_power_label) || 364 (type == hwmon_energy && attr == hwmon_energy_label) || 365 (type == hwmon_humidity && attr == hwmon_humidity_label) || 366 (type == hwmon_fan && attr == hwmon_fan_label); 367 } 368 369 static struct attribute *hwmon_genattr(const void *drvdata, 370 enum hwmon_sensor_types type, 371 u32 attr, 372 int index, 373 const char *template, 374 const struct hwmon_ops *ops) 375 { 376 struct hwmon_device_attribute *hattr; 377 struct device_attribute *dattr; 378 struct attribute *a; 379 umode_t mode; 380 const char *name; 381 bool is_string = is_string_attr(type, attr); 382 383 /* The attribute is invisible if there is no template string */ 384 if (!template) 385 return ERR_PTR(-ENOENT); 386 387 mode = ops->is_visible(drvdata, type, attr, index); 388 if (!mode) 389 return ERR_PTR(-ENOENT); 390 391 if ((mode & 0444) && ((is_string && !ops->read_string) || 392 (!is_string && !ops->read))) 393 return ERR_PTR(-EINVAL); 394 if ((mode & 0222) && !ops->write) 395 return ERR_PTR(-EINVAL); 396 397 hattr = kzalloc(sizeof(*hattr), GFP_KERNEL); 398 if (!hattr) 399 return ERR_PTR(-ENOMEM); 400 401 if (type == hwmon_chip) { 402 name = template; 403 } else { 404 scnprintf(hattr->name, sizeof(hattr->name), template, 405 index + hwmon_attr_base(type)); 406 name = hattr->name; 407 } 408 409 hattr->type = type; 410 hattr->attr = attr; 411 hattr->index = index; 412 hattr->ops = ops; 413 414 dattr = &hattr->dev_attr; 415 dattr->show = is_string ? hwmon_attr_show_string : hwmon_attr_show; 416 dattr->store = hwmon_attr_store; 417 418 a = &dattr->attr; 419 sysfs_attr_init(a); 420 a->name = name; 421 a->mode = mode; 422 423 return a; 424 } 425 426 /* 427 * Chip attributes are not attribute templates but actual sysfs attributes. 428 * See hwmon_genattr() for special handling. 429 */ 430 static const char * const hwmon_chip_attrs[] = { 431 [hwmon_chip_temp_reset_history] = "temp_reset_history", 432 [hwmon_chip_in_reset_history] = "in_reset_history", 433 [hwmon_chip_curr_reset_history] = "curr_reset_history", 434 [hwmon_chip_power_reset_history] = "power_reset_history", 435 [hwmon_chip_update_interval] = "update_interval", 436 [hwmon_chip_alarms] = "alarms", 437 [hwmon_chip_samples] = "samples", 438 [hwmon_chip_curr_samples] = "curr_samples", 439 [hwmon_chip_in_samples] = "in_samples", 440 [hwmon_chip_power_samples] = "power_samples", 441 [hwmon_chip_temp_samples] = "temp_samples", 442 }; 443 444 static const char * const hwmon_temp_attr_templates[] = { 445 [hwmon_temp_enable] = "temp%d_enable", 446 [hwmon_temp_input] = "temp%d_input", 447 [hwmon_temp_type] = "temp%d_type", 448 [hwmon_temp_lcrit] = "temp%d_lcrit", 449 [hwmon_temp_lcrit_hyst] = "temp%d_lcrit_hyst", 450 [hwmon_temp_min] = "temp%d_min", 451 [hwmon_temp_min_hyst] = "temp%d_min_hyst", 452 [hwmon_temp_max] = "temp%d_max", 453 [hwmon_temp_max_hyst] = "temp%d_max_hyst", 454 [hwmon_temp_crit] = "temp%d_crit", 455 [hwmon_temp_crit_hyst] = "temp%d_crit_hyst", 456 [hwmon_temp_emergency] = "temp%d_emergency", 457 [hwmon_temp_emergency_hyst] = "temp%d_emergency_hyst", 458 [hwmon_temp_alarm] = "temp%d_alarm", 459 [hwmon_temp_lcrit_alarm] = "temp%d_lcrit_alarm", 460 [hwmon_temp_min_alarm] = "temp%d_min_alarm", 461 [hwmon_temp_max_alarm] = "temp%d_max_alarm", 462 [hwmon_temp_crit_alarm] = "temp%d_crit_alarm", 463 [hwmon_temp_emergency_alarm] = "temp%d_emergency_alarm", 464 [hwmon_temp_fault] = "temp%d_fault", 465 [hwmon_temp_offset] = "temp%d_offset", 466 [hwmon_temp_label] = "temp%d_label", 467 [hwmon_temp_lowest] = "temp%d_lowest", 468 [hwmon_temp_highest] = "temp%d_highest", 469 [hwmon_temp_reset_history] = "temp%d_reset_history", 470 [hwmon_temp_rated_min] = "temp%d_rated_min", 471 [hwmon_temp_rated_max] = "temp%d_rated_max", 472 }; 473 474 static const char * const hwmon_in_attr_templates[] = { 475 [hwmon_in_enable] = "in%d_enable", 476 [hwmon_in_input] = "in%d_input", 477 [hwmon_in_min] = "in%d_min", 478 [hwmon_in_max] = "in%d_max", 479 [hwmon_in_lcrit] = "in%d_lcrit", 480 [hwmon_in_crit] = "in%d_crit", 481 [hwmon_in_average] = "in%d_average", 482 [hwmon_in_lowest] = "in%d_lowest", 483 [hwmon_in_highest] = "in%d_highest", 484 [hwmon_in_reset_history] = "in%d_reset_history", 485 [hwmon_in_label] = "in%d_label", 486 [hwmon_in_alarm] = "in%d_alarm", 487 [hwmon_in_min_alarm] = "in%d_min_alarm", 488 [hwmon_in_max_alarm] = "in%d_max_alarm", 489 [hwmon_in_lcrit_alarm] = "in%d_lcrit_alarm", 490 [hwmon_in_crit_alarm] = "in%d_crit_alarm", 491 [hwmon_in_rated_min] = "in%d_rated_min", 492 [hwmon_in_rated_max] = "in%d_rated_max", 493 }; 494 495 static const char * const hwmon_curr_attr_templates[] = { 496 [hwmon_curr_enable] = "curr%d_enable", 497 [hwmon_curr_input] = "curr%d_input", 498 [hwmon_curr_min] = "curr%d_min", 499 [hwmon_curr_max] = "curr%d_max", 500 [hwmon_curr_lcrit] = "curr%d_lcrit", 501 [hwmon_curr_crit] = "curr%d_crit", 502 [hwmon_curr_average] = "curr%d_average", 503 [hwmon_curr_lowest] = "curr%d_lowest", 504 [hwmon_curr_highest] = "curr%d_highest", 505 [hwmon_curr_reset_history] = "curr%d_reset_history", 506 [hwmon_curr_label] = "curr%d_label", 507 [hwmon_curr_alarm] = "curr%d_alarm", 508 [hwmon_curr_min_alarm] = "curr%d_min_alarm", 509 [hwmon_curr_max_alarm] = "curr%d_max_alarm", 510 [hwmon_curr_lcrit_alarm] = "curr%d_lcrit_alarm", 511 [hwmon_curr_crit_alarm] = "curr%d_crit_alarm", 512 [hwmon_curr_rated_min] = "curr%d_rated_min", 513 [hwmon_curr_rated_max] = "curr%d_rated_max", 514 }; 515 516 static const char * const hwmon_power_attr_templates[] = { 517 [hwmon_power_enable] = "power%d_enable", 518 [hwmon_power_average] = "power%d_average", 519 [hwmon_power_average_interval] = "power%d_average_interval", 520 [hwmon_power_average_interval_max] = "power%d_interval_max", 521 [hwmon_power_average_interval_min] = "power%d_interval_min", 522 [hwmon_power_average_highest] = "power%d_average_highest", 523 [hwmon_power_average_lowest] = "power%d_average_lowest", 524 [hwmon_power_average_max] = "power%d_average_max", 525 [hwmon_power_average_min] = "power%d_average_min", 526 [hwmon_power_input] = "power%d_input", 527 [hwmon_power_input_highest] = "power%d_input_highest", 528 [hwmon_power_input_lowest] = "power%d_input_lowest", 529 [hwmon_power_reset_history] = "power%d_reset_history", 530 [hwmon_power_accuracy] = "power%d_accuracy", 531 [hwmon_power_cap] = "power%d_cap", 532 [hwmon_power_cap_hyst] = "power%d_cap_hyst", 533 [hwmon_power_cap_max] = "power%d_cap_max", 534 [hwmon_power_cap_min] = "power%d_cap_min", 535 [hwmon_power_min] = "power%d_min", 536 [hwmon_power_max] = "power%d_max", 537 [hwmon_power_lcrit] = "power%d_lcrit", 538 [hwmon_power_crit] = "power%d_crit", 539 [hwmon_power_label] = "power%d_label", 540 [hwmon_power_alarm] = "power%d_alarm", 541 [hwmon_power_cap_alarm] = "power%d_cap_alarm", 542 [hwmon_power_min_alarm] = "power%d_min_alarm", 543 [hwmon_power_max_alarm] = "power%d_max_alarm", 544 [hwmon_power_lcrit_alarm] = "power%d_lcrit_alarm", 545 [hwmon_power_crit_alarm] = "power%d_crit_alarm", 546 [hwmon_power_rated_min] = "power%d_rated_min", 547 [hwmon_power_rated_max] = "power%d_rated_max", 548 }; 549 550 static const char * const hwmon_energy_attr_templates[] = { 551 [hwmon_energy_enable] = "energy%d_enable", 552 [hwmon_energy_input] = "energy%d_input", 553 [hwmon_energy_label] = "energy%d_label", 554 }; 555 556 static const char * const hwmon_humidity_attr_templates[] = { 557 [hwmon_humidity_enable] = "humidity%d_enable", 558 [hwmon_humidity_input] = "humidity%d_input", 559 [hwmon_humidity_label] = "humidity%d_label", 560 [hwmon_humidity_min] = "humidity%d_min", 561 [hwmon_humidity_min_hyst] = "humidity%d_min_hyst", 562 [hwmon_humidity_max] = "humidity%d_max", 563 [hwmon_humidity_max_hyst] = "humidity%d_max_hyst", 564 [hwmon_humidity_alarm] = "humidity%d_alarm", 565 [hwmon_humidity_fault] = "humidity%d_fault", 566 [hwmon_humidity_rated_min] = "humidity%d_rated_min", 567 [hwmon_humidity_rated_max] = "humidity%d_rated_max", 568 }; 569 570 static const char * const hwmon_fan_attr_templates[] = { 571 [hwmon_fan_enable] = "fan%d_enable", 572 [hwmon_fan_input] = "fan%d_input", 573 [hwmon_fan_label] = "fan%d_label", 574 [hwmon_fan_min] = "fan%d_min", 575 [hwmon_fan_max] = "fan%d_max", 576 [hwmon_fan_div] = "fan%d_div", 577 [hwmon_fan_pulses] = "fan%d_pulses", 578 [hwmon_fan_target] = "fan%d_target", 579 [hwmon_fan_alarm] = "fan%d_alarm", 580 [hwmon_fan_min_alarm] = "fan%d_min_alarm", 581 [hwmon_fan_max_alarm] = "fan%d_max_alarm", 582 [hwmon_fan_fault] = "fan%d_fault", 583 }; 584 585 static const char * const hwmon_pwm_attr_templates[] = { 586 [hwmon_pwm_input] = "pwm%d", 587 [hwmon_pwm_enable] = "pwm%d_enable", 588 [hwmon_pwm_mode] = "pwm%d_mode", 589 [hwmon_pwm_freq] = "pwm%d_freq", 590 }; 591 592 static const char * const hwmon_intrusion_attr_templates[] = { 593 [hwmon_intrusion_alarm] = "intrusion%d_alarm", 594 [hwmon_intrusion_beep] = "intrusion%d_beep", 595 }; 596 597 static const char * const *__templates[] = { 598 [hwmon_chip] = hwmon_chip_attrs, 599 [hwmon_temp] = hwmon_temp_attr_templates, 600 [hwmon_in] = hwmon_in_attr_templates, 601 [hwmon_curr] = hwmon_curr_attr_templates, 602 [hwmon_power] = hwmon_power_attr_templates, 603 [hwmon_energy] = hwmon_energy_attr_templates, 604 [hwmon_humidity] = hwmon_humidity_attr_templates, 605 [hwmon_fan] = hwmon_fan_attr_templates, 606 [hwmon_pwm] = hwmon_pwm_attr_templates, 607 [hwmon_intrusion] = hwmon_intrusion_attr_templates, 608 }; 609 610 static const int __templates_size[] = { 611 [hwmon_chip] = ARRAY_SIZE(hwmon_chip_attrs), 612 [hwmon_temp] = ARRAY_SIZE(hwmon_temp_attr_templates), 613 [hwmon_in] = ARRAY_SIZE(hwmon_in_attr_templates), 614 [hwmon_curr] = ARRAY_SIZE(hwmon_curr_attr_templates), 615 [hwmon_power] = ARRAY_SIZE(hwmon_power_attr_templates), 616 [hwmon_energy] = ARRAY_SIZE(hwmon_energy_attr_templates), 617 [hwmon_humidity] = ARRAY_SIZE(hwmon_humidity_attr_templates), 618 [hwmon_fan] = ARRAY_SIZE(hwmon_fan_attr_templates), 619 [hwmon_pwm] = ARRAY_SIZE(hwmon_pwm_attr_templates), 620 [hwmon_intrusion] = ARRAY_SIZE(hwmon_intrusion_attr_templates), 621 }; 622 623 int hwmon_notify_event(struct device *dev, enum hwmon_sensor_types type, 624 u32 attr, int channel) 625 { 626 char sattr[MAX_SYSFS_ATTR_NAME_LENGTH]; 627 const char * const *templates; 628 const char *template; 629 int base; 630 631 if (type >= ARRAY_SIZE(__templates)) 632 return -EINVAL; 633 if (attr >= __templates_size[type]) 634 return -EINVAL; 635 636 templates = __templates[type]; 637 template = templates[attr]; 638 639 base = hwmon_attr_base(type); 640 641 scnprintf(sattr, MAX_SYSFS_ATTR_NAME_LENGTH, template, base + channel); 642 sysfs_notify(&dev->kobj, NULL, sattr); 643 kobject_uevent(&dev->kobj, KOBJ_CHANGE); 644 645 if (type == hwmon_temp) 646 hwmon_thermal_notify(dev, channel); 647 648 return 0; 649 } 650 EXPORT_SYMBOL_GPL(hwmon_notify_event); 651 652 static int hwmon_num_channel_attrs(const struct hwmon_channel_info *info) 653 { 654 int i, n; 655 656 for (i = n = 0; info->config[i]; i++) 657 n += hweight32(info->config[i]); 658 659 return n; 660 } 661 662 static int hwmon_genattrs(const void *drvdata, 663 struct attribute **attrs, 664 const struct hwmon_ops *ops, 665 const struct hwmon_channel_info *info) 666 { 667 const char * const *templates; 668 int template_size; 669 int i, aindex = 0; 670 671 if (info->type >= ARRAY_SIZE(__templates)) 672 return -EINVAL; 673 674 templates = __templates[info->type]; 675 template_size = __templates_size[info->type]; 676 677 for (i = 0; info->config[i]; i++) { 678 u32 attr_mask = info->config[i]; 679 u32 attr; 680 681 while (attr_mask) { 682 struct attribute *a; 683 684 attr = __ffs(attr_mask); 685 attr_mask &= ~BIT(attr); 686 if (attr >= template_size) 687 return -EINVAL; 688 a = hwmon_genattr(drvdata, info->type, attr, i, 689 templates[attr], ops); 690 if (IS_ERR(a)) { 691 if (PTR_ERR(a) != -ENOENT) 692 return PTR_ERR(a); 693 continue; 694 } 695 attrs[aindex++] = a; 696 } 697 } 698 return aindex; 699 } 700 701 static struct attribute ** 702 __hwmon_create_attrs(const void *drvdata, const struct hwmon_chip_info *chip) 703 { 704 int ret, i, aindex = 0, nattrs = 0; 705 struct attribute **attrs; 706 707 for (i = 0; chip->info[i]; i++) 708 nattrs += hwmon_num_channel_attrs(chip->info[i]); 709 710 if (nattrs == 0) 711 return ERR_PTR(-EINVAL); 712 713 attrs = kcalloc(nattrs + 1, sizeof(*attrs), GFP_KERNEL); 714 if (!attrs) 715 return ERR_PTR(-ENOMEM); 716 717 for (i = 0; chip->info[i]; i++) { 718 ret = hwmon_genattrs(drvdata, &attrs[aindex], chip->ops, 719 chip->info[i]); 720 if (ret < 0) { 721 hwmon_free_attrs(attrs); 722 return ERR_PTR(ret); 723 } 724 aindex += ret; 725 } 726 727 return attrs; 728 } 729 730 static struct device * 731 __hwmon_device_register(struct device *dev, const char *name, void *drvdata, 732 const struct hwmon_chip_info *chip, 733 const struct attribute_group **groups) 734 { 735 struct hwmon_device *hwdev; 736 struct device *hdev; 737 int i, err, id; 738 739 /* Complain about invalid characters in hwmon name attribute */ 740 if (name && (!strlen(name) || strpbrk(name, "-* \t\n"))) 741 dev_warn(dev, 742 "hwmon: '%s' is not a valid name attribute, please fix\n", 743 name); 744 745 id = ida_simple_get(&hwmon_ida, 0, 0, GFP_KERNEL); 746 if (id < 0) 747 return ERR_PTR(id); 748 749 hwdev = kzalloc(sizeof(*hwdev), GFP_KERNEL); 750 if (hwdev == NULL) { 751 err = -ENOMEM; 752 goto ida_remove; 753 } 754 755 hdev = &hwdev->dev; 756 757 if (chip) { 758 struct attribute **attrs; 759 int ngroups = 2; /* terminating NULL plus &hwdev->groups */ 760 761 if (groups) 762 for (i = 0; groups[i]; i++) 763 ngroups++; 764 765 hwdev->groups = kcalloc(ngroups, sizeof(*groups), GFP_KERNEL); 766 if (!hwdev->groups) { 767 err = -ENOMEM; 768 goto free_hwmon; 769 } 770 771 attrs = __hwmon_create_attrs(drvdata, chip); 772 if (IS_ERR(attrs)) { 773 err = PTR_ERR(attrs); 774 goto free_hwmon; 775 } 776 777 hwdev->group.attrs = attrs; 778 ngroups = 0; 779 hwdev->groups[ngroups++] = &hwdev->group; 780 781 if (groups) { 782 for (i = 0; groups[i]; i++) 783 hwdev->groups[ngroups++] = groups[i]; 784 } 785 786 hdev->groups = hwdev->groups; 787 } else { 788 hdev->groups = groups; 789 } 790 791 hwdev->name = name; 792 hdev->class = &hwmon_class; 793 hdev->parent = dev; 794 hdev->of_node = dev ? dev->of_node : NULL; 795 hwdev->chip = chip; 796 dev_set_drvdata(hdev, drvdata); 797 dev_set_name(hdev, HWMON_ID_FORMAT, id); 798 err = device_register(hdev); 799 if (err) { 800 put_device(hdev); 801 goto ida_remove; 802 } 803 804 INIT_LIST_HEAD(&hwdev->tzdata); 805 806 if (dev && dev->of_node && chip && chip->ops->read && 807 chip->info[0]->type == hwmon_chip && 808 (chip->info[0]->config[0] & HWMON_C_REGISTER_TZ)) { 809 err = hwmon_thermal_register_sensors(hdev); 810 if (err) { 811 device_unregister(hdev); 812 /* 813 * Don't worry about hwdev; hwmon_dev_release(), called 814 * from device_unregister(), will free it. 815 */ 816 goto ida_remove; 817 } 818 } 819 820 return hdev; 821 822 free_hwmon: 823 hwmon_dev_release(hdev); 824 ida_remove: 825 ida_simple_remove(&hwmon_ida, id); 826 return ERR_PTR(err); 827 } 828 829 /** 830 * hwmon_device_register_with_groups - register w/ hwmon 831 * @dev: the parent device 832 * @name: hwmon name attribute 833 * @drvdata: driver data to attach to created device 834 * @groups: List of attribute groups to create 835 * 836 * hwmon_device_unregister() must be called when the device is no 837 * longer needed. 838 * 839 * Returns the pointer to the new device. 840 */ 841 struct device * 842 hwmon_device_register_with_groups(struct device *dev, const char *name, 843 void *drvdata, 844 const struct attribute_group **groups) 845 { 846 if (!name) 847 return ERR_PTR(-EINVAL); 848 849 return __hwmon_device_register(dev, name, drvdata, NULL, groups); 850 } 851 EXPORT_SYMBOL_GPL(hwmon_device_register_with_groups); 852 853 /** 854 * hwmon_device_register_with_info - register w/ hwmon 855 * @dev: the parent device 856 * @name: hwmon name attribute 857 * @drvdata: driver data to attach to created device 858 * @chip: pointer to hwmon chip information 859 * @extra_groups: pointer to list of additional non-standard attribute groups 860 * 861 * hwmon_device_unregister() must be called when the device is no 862 * longer needed. 863 * 864 * Returns the pointer to the new device. 865 */ 866 struct device * 867 hwmon_device_register_with_info(struct device *dev, const char *name, 868 void *drvdata, 869 const struct hwmon_chip_info *chip, 870 const struct attribute_group **extra_groups) 871 { 872 if (!name) 873 return ERR_PTR(-EINVAL); 874 875 if (chip && (!chip->ops || !chip->ops->is_visible || !chip->info)) 876 return ERR_PTR(-EINVAL); 877 878 if (chip && !dev) 879 return ERR_PTR(-EINVAL); 880 881 return __hwmon_device_register(dev, name, drvdata, chip, extra_groups); 882 } 883 EXPORT_SYMBOL_GPL(hwmon_device_register_with_info); 884 885 /** 886 * hwmon_device_register - register w/ hwmon 887 * @dev: the device to register 888 * 889 * hwmon_device_unregister() must be called when the device is no 890 * longer needed. 891 * 892 * Returns the pointer to the new device. 893 */ 894 struct device *hwmon_device_register(struct device *dev) 895 { 896 dev_warn(dev, 897 "hwmon_device_register() is deprecated. Please convert the driver to use hwmon_device_register_with_info().\n"); 898 899 return __hwmon_device_register(dev, NULL, NULL, NULL, NULL); 900 } 901 EXPORT_SYMBOL_GPL(hwmon_device_register); 902 903 /** 904 * hwmon_device_unregister - removes the previously registered class device 905 * 906 * @dev: the class device to destroy 907 */ 908 void hwmon_device_unregister(struct device *dev) 909 { 910 int id; 911 912 if (likely(sscanf(dev_name(dev), HWMON_ID_FORMAT, &id) == 1)) { 913 device_unregister(dev); 914 ida_simple_remove(&hwmon_ida, id); 915 } else 916 dev_dbg(dev->parent, 917 "hwmon_device_unregister() failed: bad class ID!\n"); 918 } 919 EXPORT_SYMBOL_GPL(hwmon_device_unregister); 920 921 static void devm_hwmon_release(struct device *dev, void *res) 922 { 923 struct device *hwdev = *(struct device **)res; 924 925 hwmon_device_unregister(hwdev); 926 } 927 928 /** 929 * devm_hwmon_device_register_with_groups - register w/ hwmon 930 * @dev: the parent device 931 * @name: hwmon name attribute 932 * @drvdata: driver data to attach to created device 933 * @groups: List of attribute groups to create 934 * 935 * Returns the pointer to the new device. The new device is automatically 936 * unregistered with the parent device. 937 */ 938 struct device * 939 devm_hwmon_device_register_with_groups(struct device *dev, const char *name, 940 void *drvdata, 941 const struct attribute_group **groups) 942 { 943 struct device **ptr, *hwdev; 944 945 if (!dev) 946 return ERR_PTR(-EINVAL); 947 948 ptr = devres_alloc(devm_hwmon_release, sizeof(*ptr), GFP_KERNEL); 949 if (!ptr) 950 return ERR_PTR(-ENOMEM); 951 952 hwdev = hwmon_device_register_with_groups(dev, name, drvdata, groups); 953 if (IS_ERR(hwdev)) 954 goto error; 955 956 *ptr = hwdev; 957 devres_add(dev, ptr); 958 return hwdev; 959 960 error: 961 devres_free(ptr); 962 return hwdev; 963 } 964 EXPORT_SYMBOL_GPL(devm_hwmon_device_register_with_groups); 965 966 /** 967 * devm_hwmon_device_register_with_info - register w/ hwmon 968 * @dev: the parent device 969 * @name: hwmon name attribute 970 * @drvdata: driver data to attach to created device 971 * @chip: pointer to hwmon chip information 972 * @groups: pointer to list of driver specific attribute groups 973 * 974 * Returns the pointer to the new device. The new device is automatically 975 * unregistered with the parent device. 976 */ 977 struct device * 978 devm_hwmon_device_register_with_info(struct device *dev, const char *name, 979 void *drvdata, 980 const struct hwmon_chip_info *chip, 981 const struct attribute_group **groups) 982 { 983 struct device **ptr, *hwdev; 984 985 if (!dev) 986 return ERR_PTR(-EINVAL); 987 988 ptr = devres_alloc(devm_hwmon_release, sizeof(*ptr), GFP_KERNEL); 989 if (!ptr) 990 return ERR_PTR(-ENOMEM); 991 992 hwdev = hwmon_device_register_with_info(dev, name, drvdata, chip, 993 groups); 994 if (IS_ERR(hwdev)) 995 goto error; 996 997 *ptr = hwdev; 998 devres_add(dev, ptr); 999 1000 return hwdev; 1001 1002 error: 1003 devres_free(ptr); 1004 return hwdev; 1005 } 1006 EXPORT_SYMBOL_GPL(devm_hwmon_device_register_with_info); 1007 1008 static int devm_hwmon_match(struct device *dev, void *res, void *data) 1009 { 1010 struct device **hwdev = res; 1011 1012 return *hwdev == data; 1013 } 1014 1015 /** 1016 * devm_hwmon_device_unregister - removes a previously registered hwmon device 1017 * 1018 * @dev: the parent device of the device to unregister 1019 */ 1020 void devm_hwmon_device_unregister(struct device *dev) 1021 { 1022 WARN_ON(devres_release(dev, devm_hwmon_release, devm_hwmon_match, dev)); 1023 } 1024 EXPORT_SYMBOL_GPL(devm_hwmon_device_unregister); 1025 1026 static void __init hwmon_pci_quirks(void) 1027 { 1028 #if defined CONFIG_X86 && defined CONFIG_PCI 1029 struct pci_dev *sb; 1030 u16 base; 1031 u8 enable; 1032 1033 /* Open access to 0x295-0x296 on MSI MS-7031 */ 1034 sb = pci_get_device(PCI_VENDOR_ID_ATI, 0x436c, NULL); 1035 if (sb) { 1036 if (sb->subsystem_vendor == 0x1462 && /* MSI */ 1037 sb->subsystem_device == 0x0031) { /* MS-7031 */ 1038 pci_read_config_byte(sb, 0x48, &enable); 1039 pci_read_config_word(sb, 0x64, &base); 1040 1041 if (base == 0 && !(enable & BIT(2))) { 1042 dev_info(&sb->dev, 1043 "Opening wide generic port at 0x295\n"); 1044 pci_write_config_word(sb, 0x64, 0x295); 1045 pci_write_config_byte(sb, 0x48, 1046 enable | BIT(2)); 1047 } 1048 } 1049 pci_dev_put(sb); 1050 } 1051 #endif 1052 } 1053 1054 static int __init hwmon_init(void) 1055 { 1056 int err; 1057 1058 hwmon_pci_quirks(); 1059 1060 err = class_register(&hwmon_class); 1061 if (err) { 1062 pr_err("couldn't register hwmon sysfs class\n"); 1063 return err; 1064 } 1065 return 0; 1066 } 1067 1068 static void __exit hwmon_exit(void) 1069 { 1070 class_unregister(&hwmon_class); 1071 } 1072 1073 subsys_initcall(hwmon_init); 1074 module_exit(hwmon_exit); 1075 1076 MODULE_AUTHOR("Mark M. Hoffman <mhoffman@lightlink.com>"); 1077 MODULE_DESCRIPTION("hardware monitoring sysfs/class support"); 1078 MODULE_LICENSE("GPL"); 1079 1080