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