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