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