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