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