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