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