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/list.h> 19 #include <linux/module.h> 20 #include <linux/pci.h> 21 #include <linux/slab.h> 22 #include <linux/string.h> 23 #include <linux/thermal.h> 24 25 #define CREATE_TRACE_POINTS 26 #include <trace/events/hwmon.h> 27 28 #define HWMON_ID_PREFIX "hwmon" 29 #define HWMON_ID_FORMAT HWMON_ID_PREFIX "%d" 30 31 struct hwmon_device { 32 const char *name; 33 struct device dev; 34 const struct hwmon_chip_info *chip; 35 struct list_head tzdata; 36 struct attribute_group group; 37 const struct attribute_group **groups; 38 }; 39 40 #define to_hwmon_device(d) container_of(d, struct hwmon_device, dev) 41 42 #define MAX_SYSFS_ATTR_NAME_LENGTH 32 43 44 struct hwmon_device_attribute { 45 struct device_attribute dev_attr; 46 const struct hwmon_ops *ops; 47 enum hwmon_sensor_types type; 48 u32 attr; 49 int index; 50 char name[MAX_SYSFS_ATTR_NAME_LENGTH]; 51 }; 52 53 #define to_hwmon_attr(d) \ 54 container_of(d, struct hwmon_device_attribute, dev_attr) 55 #define to_dev_attr(a) container_of(a, struct device_attribute, attr) 56 57 /* 58 * Thermal zone information 59 */ 60 struct hwmon_thermal_data { 61 struct list_head node; /* hwmon tzdata list entry */ 62 struct device *dev; /* Reference to hwmon device */ 63 int index; /* sensor index */ 64 struct thermal_zone_device *tzd;/* thermal zone device */ 65 }; 66 67 static ssize_t 68 name_show(struct device *dev, struct device_attribute *attr, char *buf) 69 { 70 return sprintf(buf, "%s\n", to_hwmon_device(dev)->name); 71 } 72 static DEVICE_ATTR_RO(name); 73 74 static struct attribute *hwmon_dev_attrs[] = { 75 &dev_attr_name.attr, 76 NULL 77 }; 78 79 static umode_t hwmon_dev_name_is_visible(struct kobject *kobj, 80 struct attribute *attr, int n) 81 { 82 struct device *dev = container_of(kobj, struct device, kobj); 83 84 if (to_hwmon_device(dev)->name == NULL) 85 return 0; 86 87 return attr->mode; 88 } 89 90 static const struct attribute_group hwmon_dev_attr_group = { 91 .attrs = hwmon_dev_attrs, 92 .is_visible = hwmon_dev_name_is_visible, 93 }; 94 95 static const struct attribute_group *hwmon_dev_attr_groups[] = { 96 &hwmon_dev_attr_group, 97 NULL 98 }; 99 100 static void hwmon_free_attrs(struct attribute **attrs) 101 { 102 int i; 103 104 for (i = 0; attrs[i]; i++) { 105 struct device_attribute *dattr = to_dev_attr(attrs[i]); 106 struct hwmon_device_attribute *hattr = to_hwmon_attr(dattr); 107 108 kfree(hattr); 109 } 110 kfree(attrs); 111 } 112 113 static void hwmon_dev_release(struct device *dev) 114 { 115 struct hwmon_device *hwdev = to_hwmon_device(dev); 116 117 if (hwdev->group.attrs) 118 hwmon_free_attrs(hwdev->group.attrs); 119 kfree(hwdev->groups); 120 kfree(hwdev); 121 } 122 123 static struct class hwmon_class = { 124 .name = "hwmon", 125 .owner = THIS_MODULE, 126 .dev_groups = hwmon_dev_attr_groups, 127 .dev_release = hwmon_dev_release, 128 }; 129 130 static DEFINE_IDA(hwmon_ida); 131 132 /* Thermal zone handling */ 133 134 /* 135 * The complex conditional is necessary to avoid a cyclic dependency 136 * between hwmon and thermal_sys modules. 137 */ 138 #ifdef CONFIG_THERMAL_OF 139 static int hwmon_thermal_get_temp(void *data, int *temp) 140 { 141 struct hwmon_thermal_data *tdata = data; 142 struct hwmon_device *hwdev = to_hwmon_device(tdata->dev); 143 int ret; 144 long t; 145 146 ret = hwdev->chip->ops->read(tdata->dev, hwmon_temp, hwmon_temp_input, 147 tdata->index, &t); 148 if (ret < 0) 149 return ret; 150 151 *temp = t; 152 153 return 0; 154 } 155 156 static const struct thermal_zone_of_device_ops hwmon_thermal_ops = { 157 .get_temp = hwmon_thermal_get_temp, 158 }; 159 160 static void hwmon_thermal_remove_sensor(void *data) 161 { 162 list_del(data); 163 } 164 165 static int hwmon_thermal_add_sensor(struct device *dev, int index) 166 { 167 struct hwmon_device *hwdev = to_hwmon_device(dev); 168 struct hwmon_thermal_data *tdata; 169 struct thermal_zone_device *tzd; 170 int err; 171 172 tdata = devm_kzalloc(dev, sizeof(*tdata), GFP_KERNEL); 173 if (!tdata) 174 return -ENOMEM; 175 176 tdata->dev = dev; 177 tdata->index = index; 178 179 tzd = devm_thermal_zone_of_sensor_register(dev, index, tdata, 180 &hwmon_thermal_ops); 181 /* 182 * If CONFIG_THERMAL_OF is disabled, this returns -ENODEV, 183 * so ignore that error but forward any other error. 184 */ 185 if (IS_ERR(tzd) && (PTR_ERR(tzd) != -ENODEV)) 186 return PTR_ERR(tzd); 187 188 err = devm_add_action(dev, hwmon_thermal_remove_sensor, &tdata->node); 189 if (err) 190 return err; 191 192 tdata->tzd = tzd; 193 list_add(&tdata->node, &hwdev->tzdata); 194 195 return 0; 196 } 197 198 static int hwmon_thermal_register_sensors(struct device *dev) 199 { 200 struct hwmon_device *hwdev = to_hwmon_device(dev); 201 const struct hwmon_chip_info *chip = hwdev->chip; 202 const struct hwmon_channel_info **info = chip->info; 203 void *drvdata = dev_get_drvdata(dev); 204 int i; 205 206 for (i = 1; info[i]; i++) { 207 int j; 208 209 if (info[i]->type != hwmon_temp) 210 continue; 211 212 for (j = 0; info[i]->config[j]; j++) { 213 int err; 214 215 if (!(info[i]->config[j] & HWMON_T_INPUT) || 216 !chip->ops->is_visible(drvdata, hwmon_temp, 217 hwmon_temp_input, j)) 218 continue; 219 220 err = hwmon_thermal_add_sensor(dev, j); 221 if (err) 222 return err; 223 } 224 } 225 226 return 0; 227 } 228 229 static void hwmon_thermal_notify(struct device *dev, int index) 230 { 231 struct hwmon_device *hwdev = to_hwmon_device(dev); 232 struct hwmon_thermal_data *tzdata; 233 234 list_for_each_entry(tzdata, &hwdev->tzdata, node) { 235 if (tzdata->index == index) { 236 thermal_zone_device_update(tzdata->tzd, 237 THERMAL_EVENT_UNSPECIFIED); 238 } 239 } 240 } 241 242 #else 243 static int hwmon_thermal_register_sensors(struct device *dev) 244 { 245 return 0; 246 } 247 248 static void hwmon_thermal_notify(struct device *dev, int index) { } 249 250 #endif /* IS_REACHABLE(CONFIG_THERMAL) && ... */ 251 252 static int hwmon_attr_base(enum hwmon_sensor_types type) 253 { 254 if (type == hwmon_in || type == hwmon_intrusion) 255 return 0; 256 return 1; 257 } 258 259 /* sysfs attribute management */ 260 261 static ssize_t hwmon_attr_show(struct device *dev, 262 struct device_attribute *devattr, char *buf) 263 { 264 struct hwmon_device_attribute *hattr = to_hwmon_attr(devattr); 265 long val; 266 int ret; 267 268 ret = hattr->ops->read(dev, hattr->type, hattr->attr, hattr->index, 269 &val); 270 if (ret < 0) 271 return ret; 272 273 trace_hwmon_attr_show(hattr->index + hwmon_attr_base(hattr->type), 274 hattr->name, val); 275 276 return sprintf(buf, "%ld\n", val); 277 } 278 279 static ssize_t hwmon_attr_show_string(struct device *dev, 280 struct device_attribute *devattr, 281 char *buf) 282 { 283 struct hwmon_device_attribute *hattr = to_hwmon_attr(devattr); 284 enum hwmon_sensor_types type = hattr->type; 285 const char *s; 286 int ret; 287 288 ret = hattr->ops->read_string(dev, hattr->type, hattr->attr, 289 hattr->index, &s); 290 if (ret < 0) 291 return ret; 292 293 trace_hwmon_attr_show_string(hattr->index + hwmon_attr_base(type), 294 hattr->name, s); 295 296 return sprintf(buf, "%s\n", s); 297 } 298 299 static ssize_t hwmon_attr_store(struct device *dev, 300 struct device_attribute *devattr, 301 const char *buf, size_t count) 302 { 303 struct hwmon_device_attribute *hattr = to_hwmon_attr(devattr); 304 long val; 305 int ret; 306 307 ret = kstrtol(buf, 10, &val); 308 if (ret < 0) 309 return ret; 310 311 ret = hattr->ops->write(dev, hattr->type, hattr->attr, hattr->index, 312 val); 313 if (ret < 0) 314 return ret; 315 316 trace_hwmon_attr_store(hattr->index + hwmon_attr_base(hattr->type), 317 hattr->name, val); 318 319 return count; 320 } 321 322 static bool is_string_attr(enum hwmon_sensor_types type, u32 attr) 323 { 324 return (type == hwmon_temp && attr == hwmon_temp_label) || 325 (type == hwmon_in && attr == hwmon_in_label) || 326 (type == hwmon_curr && attr == hwmon_curr_label) || 327 (type == hwmon_power && attr == hwmon_power_label) || 328 (type == hwmon_energy && attr == hwmon_energy_label) || 329 (type == hwmon_humidity && attr == hwmon_humidity_label) || 330 (type == hwmon_fan && attr == hwmon_fan_label); 331 } 332 333 static struct attribute *hwmon_genattr(const void *drvdata, 334 enum hwmon_sensor_types type, 335 u32 attr, 336 int index, 337 const char *template, 338 const struct hwmon_ops *ops) 339 { 340 struct hwmon_device_attribute *hattr; 341 struct device_attribute *dattr; 342 struct attribute *a; 343 umode_t mode; 344 const char *name; 345 bool is_string = is_string_attr(type, attr); 346 347 /* The attribute is invisible if there is no template string */ 348 if (!template) 349 return ERR_PTR(-ENOENT); 350 351 mode = ops->is_visible(drvdata, type, attr, index); 352 if (!mode) 353 return ERR_PTR(-ENOENT); 354 355 if ((mode & 0444) && ((is_string && !ops->read_string) || 356 (!is_string && !ops->read))) 357 return ERR_PTR(-EINVAL); 358 if ((mode & 0222) && !ops->write) 359 return ERR_PTR(-EINVAL); 360 361 hattr = kzalloc(sizeof(*hattr), GFP_KERNEL); 362 if (!hattr) 363 return ERR_PTR(-ENOMEM); 364 365 if (type == hwmon_chip) { 366 name = template; 367 } else { 368 scnprintf(hattr->name, sizeof(hattr->name), template, 369 index + hwmon_attr_base(type)); 370 name = hattr->name; 371 } 372 373 hattr->type = type; 374 hattr->attr = attr; 375 hattr->index = index; 376 hattr->ops = ops; 377 378 dattr = &hattr->dev_attr; 379 dattr->show = is_string ? hwmon_attr_show_string : hwmon_attr_show; 380 dattr->store = hwmon_attr_store; 381 382 a = &dattr->attr; 383 sysfs_attr_init(a); 384 a->name = name; 385 a->mode = mode; 386 387 return a; 388 } 389 390 /* 391 * Chip attributes are not attribute templates but actual sysfs attributes. 392 * See hwmon_genattr() for special handling. 393 */ 394 static const char * const hwmon_chip_attrs[] = { 395 [hwmon_chip_temp_reset_history] = "temp_reset_history", 396 [hwmon_chip_in_reset_history] = "in_reset_history", 397 [hwmon_chip_curr_reset_history] = "curr_reset_history", 398 [hwmon_chip_power_reset_history] = "power_reset_history", 399 [hwmon_chip_update_interval] = "update_interval", 400 [hwmon_chip_alarms] = "alarms", 401 [hwmon_chip_samples] = "samples", 402 [hwmon_chip_curr_samples] = "curr_samples", 403 [hwmon_chip_in_samples] = "in_samples", 404 [hwmon_chip_power_samples] = "power_samples", 405 [hwmon_chip_temp_samples] = "temp_samples", 406 }; 407 408 static const char * const hwmon_temp_attr_templates[] = { 409 [hwmon_temp_enable] = "temp%d_enable", 410 [hwmon_temp_input] = "temp%d_input", 411 [hwmon_temp_type] = "temp%d_type", 412 [hwmon_temp_lcrit] = "temp%d_lcrit", 413 [hwmon_temp_lcrit_hyst] = "temp%d_lcrit_hyst", 414 [hwmon_temp_min] = "temp%d_min", 415 [hwmon_temp_min_hyst] = "temp%d_min_hyst", 416 [hwmon_temp_max] = "temp%d_max", 417 [hwmon_temp_max_hyst] = "temp%d_max_hyst", 418 [hwmon_temp_crit] = "temp%d_crit", 419 [hwmon_temp_crit_hyst] = "temp%d_crit_hyst", 420 [hwmon_temp_emergency] = "temp%d_emergency", 421 [hwmon_temp_emergency_hyst] = "temp%d_emergency_hyst", 422 [hwmon_temp_alarm] = "temp%d_alarm", 423 [hwmon_temp_lcrit_alarm] = "temp%d_lcrit_alarm", 424 [hwmon_temp_min_alarm] = "temp%d_min_alarm", 425 [hwmon_temp_max_alarm] = "temp%d_max_alarm", 426 [hwmon_temp_crit_alarm] = "temp%d_crit_alarm", 427 [hwmon_temp_emergency_alarm] = "temp%d_emergency_alarm", 428 [hwmon_temp_fault] = "temp%d_fault", 429 [hwmon_temp_offset] = "temp%d_offset", 430 [hwmon_temp_label] = "temp%d_label", 431 [hwmon_temp_lowest] = "temp%d_lowest", 432 [hwmon_temp_highest] = "temp%d_highest", 433 [hwmon_temp_reset_history] = "temp%d_reset_history", 434 [hwmon_temp_rated_min] = "temp%d_rated_min", 435 [hwmon_temp_rated_max] = "temp%d_rated_max", 436 }; 437 438 static const char * const hwmon_in_attr_templates[] = { 439 [hwmon_in_enable] = "in%d_enable", 440 [hwmon_in_input] = "in%d_input", 441 [hwmon_in_min] = "in%d_min", 442 [hwmon_in_max] = "in%d_max", 443 [hwmon_in_lcrit] = "in%d_lcrit", 444 [hwmon_in_crit] = "in%d_crit", 445 [hwmon_in_average] = "in%d_average", 446 [hwmon_in_lowest] = "in%d_lowest", 447 [hwmon_in_highest] = "in%d_highest", 448 [hwmon_in_reset_history] = "in%d_reset_history", 449 [hwmon_in_label] = "in%d_label", 450 [hwmon_in_alarm] = "in%d_alarm", 451 [hwmon_in_min_alarm] = "in%d_min_alarm", 452 [hwmon_in_max_alarm] = "in%d_max_alarm", 453 [hwmon_in_lcrit_alarm] = "in%d_lcrit_alarm", 454 [hwmon_in_crit_alarm] = "in%d_crit_alarm", 455 [hwmon_in_rated_min] = "in%d_rated_min", 456 [hwmon_in_rated_max] = "in%d_rated_max", 457 }; 458 459 static const char * const hwmon_curr_attr_templates[] = { 460 [hwmon_curr_enable] = "curr%d_enable", 461 [hwmon_curr_input] = "curr%d_input", 462 [hwmon_curr_min] = "curr%d_min", 463 [hwmon_curr_max] = "curr%d_max", 464 [hwmon_curr_lcrit] = "curr%d_lcrit", 465 [hwmon_curr_crit] = "curr%d_crit", 466 [hwmon_curr_average] = "curr%d_average", 467 [hwmon_curr_lowest] = "curr%d_lowest", 468 [hwmon_curr_highest] = "curr%d_highest", 469 [hwmon_curr_reset_history] = "curr%d_reset_history", 470 [hwmon_curr_label] = "curr%d_label", 471 [hwmon_curr_alarm] = "curr%d_alarm", 472 [hwmon_curr_min_alarm] = "curr%d_min_alarm", 473 [hwmon_curr_max_alarm] = "curr%d_max_alarm", 474 [hwmon_curr_lcrit_alarm] = "curr%d_lcrit_alarm", 475 [hwmon_curr_crit_alarm] = "curr%d_crit_alarm", 476 [hwmon_curr_rated_min] = "curr%d_rated_min", 477 [hwmon_curr_rated_max] = "curr%d_rated_max", 478 }; 479 480 static const char * const hwmon_power_attr_templates[] = { 481 [hwmon_power_enable] = "power%d_enable", 482 [hwmon_power_average] = "power%d_average", 483 [hwmon_power_average_interval] = "power%d_average_interval", 484 [hwmon_power_average_interval_max] = "power%d_interval_max", 485 [hwmon_power_average_interval_min] = "power%d_interval_min", 486 [hwmon_power_average_highest] = "power%d_average_highest", 487 [hwmon_power_average_lowest] = "power%d_average_lowest", 488 [hwmon_power_average_max] = "power%d_average_max", 489 [hwmon_power_average_min] = "power%d_average_min", 490 [hwmon_power_input] = "power%d_input", 491 [hwmon_power_input_highest] = "power%d_input_highest", 492 [hwmon_power_input_lowest] = "power%d_input_lowest", 493 [hwmon_power_reset_history] = "power%d_reset_history", 494 [hwmon_power_accuracy] = "power%d_accuracy", 495 [hwmon_power_cap] = "power%d_cap", 496 [hwmon_power_cap_hyst] = "power%d_cap_hyst", 497 [hwmon_power_cap_max] = "power%d_cap_max", 498 [hwmon_power_cap_min] = "power%d_cap_min", 499 [hwmon_power_min] = "power%d_min", 500 [hwmon_power_max] = "power%d_max", 501 [hwmon_power_lcrit] = "power%d_lcrit", 502 [hwmon_power_crit] = "power%d_crit", 503 [hwmon_power_label] = "power%d_label", 504 [hwmon_power_alarm] = "power%d_alarm", 505 [hwmon_power_cap_alarm] = "power%d_cap_alarm", 506 [hwmon_power_min_alarm] = "power%d_min_alarm", 507 [hwmon_power_max_alarm] = "power%d_max_alarm", 508 [hwmon_power_lcrit_alarm] = "power%d_lcrit_alarm", 509 [hwmon_power_crit_alarm] = "power%d_crit_alarm", 510 [hwmon_power_rated_min] = "power%d_rated_min", 511 [hwmon_power_rated_max] = "power%d_rated_max", 512 }; 513 514 static const char * const hwmon_energy_attr_templates[] = { 515 [hwmon_energy_enable] = "energy%d_enable", 516 [hwmon_energy_input] = "energy%d_input", 517 [hwmon_energy_label] = "energy%d_label", 518 }; 519 520 static const char * const hwmon_humidity_attr_templates[] = { 521 [hwmon_humidity_enable] = "humidity%d_enable", 522 [hwmon_humidity_input] = "humidity%d_input", 523 [hwmon_humidity_label] = "humidity%d_label", 524 [hwmon_humidity_min] = "humidity%d_min", 525 [hwmon_humidity_min_hyst] = "humidity%d_min_hyst", 526 [hwmon_humidity_max] = "humidity%d_max", 527 [hwmon_humidity_max_hyst] = "humidity%d_max_hyst", 528 [hwmon_humidity_alarm] = "humidity%d_alarm", 529 [hwmon_humidity_fault] = "humidity%d_fault", 530 [hwmon_humidity_rated_min] = "humidity%d_rated_min", 531 [hwmon_humidity_rated_max] = "humidity%d_rated_max", 532 }; 533 534 static const char * const hwmon_fan_attr_templates[] = { 535 [hwmon_fan_enable] = "fan%d_enable", 536 [hwmon_fan_input] = "fan%d_input", 537 [hwmon_fan_label] = "fan%d_label", 538 [hwmon_fan_min] = "fan%d_min", 539 [hwmon_fan_max] = "fan%d_max", 540 [hwmon_fan_div] = "fan%d_div", 541 [hwmon_fan_pulses] = "fan%d_pulses", 542 [hwmon_fan_target] = "fan%d_target", 543 [hwmon_fan_alarm] = "fan%d_alarm", 544 [hwmon_fan_min_alarm] = "fan%d_min_alarm", 545 [hwmon_fan_max_alarm] = "fan%d_max_alarm", 546 [hwmon_fan_fault] = "fan%d_fault", 547 }; 548 549 static const char * const hwmon_pwm_attr_templates[] = { 550 [hwmon_pwm_input] = "pwm%d", 551 [hwmon_pwm_enable] = "pwm%d_enable", 552 [hwmon_pwm_mode] = "pwm%d_mode", 553 [hwmon_pwm_freq] = "pwm%d_freq", 554 }; 555 556 static const char * const hwmon_intrusion_attr_templates[] = { 557 [hwmon_intrusion_alarm] = "intrusion%d_alarm", 558 [hwmon_intrusion_beep] = "intrusion%d_beep", 559 }; 560 561 static const char * const *__templates[] = { 562 [hwmon_chip] = hwmon_chip_attrs, 563 [hwmon_temp] = hwmon_temp_attr_templates, 564 [hwmon_in] = hwmon_in_attr_templates, 565 [hwmon_curr] = hwmon_curr_attr_templates, 566 [hwmon_power] = hwmon_power_attr_templates, 567 [hwmon_energy] = hwmon_energy_attr_templates, 568 [hwmon_humidity] = hwmon_humidity_attr_templates, 569 [hwmon_fan] = hwmon_fan_attr_templates, 570 [hwmon_pwm] = hwmon_pwm_attr_templates, 571 [hwmon_intrusion] = hwmon_intrusion_attr_templates, 572 }; 573 574 static const int __templates_size[] = { 575 [hwmon_chip] = ARRAY_SIZE(hwmon_chip_attrs), 576 [hwmon_temp] = ARRAY_SIZE(hwmon_temp_attr_templates), 577 [hwmon_in] = ARRAY_SIZE(hwmon_in_attr_templates), 578 [hwmon_curr] = ARRAY_SIZE(hwmon_curr_attr_templates), 579 [hwmon_power] = ARRAY_SIZE(hwmon_power_attr_templates), 580 [hwmon_energy] = ARRAY_SIZE(hwmon_energy_attr_templates), 581 [hwmon_humidity] = ARRAY_SIZE(hwmon_humidity_attr_templates), 582 [hwmon_fan] = ARRAY_SIZE(hwmon_fan_attr_templates), 583 [hwmon_pwm] = ARRAY_SIZE(hwmon_pwm_attr_templates), 584 [hwmon_intrusion] = ARRAY_SIZE(hwmon_intrusion_attr_templates), 585 }; 586 587 int hwmon_notify_event(struct device *dev, enum hwmon_sensor_types type, 588 u32 attr, int channel) 589 { 590 char sattr[MAX_SYSFS_ATTR_NAME_LENGTH]; 591 const char * const *templates; 592 const char *template; 593 int base; 594 595 if (type >= ARRAY_SIZE(__templates)) 596 return -EINVAL; 597 if (attr >= __templates_size[type]) 598 return -EINVAL; 599 600 templates = __templates[type]; 601 template = templates[attr]; 602 603 base = hwmon_attr_base(type); 604 605 scnprintf(sattr, MAX_SYSFS_ATTR_NAME_LENGTH, template, base + channel); 606 sysfs_notify(&dev->kobj, NULL, sattr); 607 kobject_uevent(&dev->kobj, KOBJ_CHANGE); 608 609 if (type == hwmon_temp) 610 hwmon_thermal_notify(dev, channel); 611 612 return 0; 613 } 614 EXPORT_SYMBOL_GPL(hwmon_notify_event); 615 616 static int hwmon_num_channel_attrs(const struct hwmon_channel_info *info) 617 { 618 int i, n; 619 620 for (i = n = 0; info->config[i]; i++) 621 n += hweight32(info->config[i]); 622 623 return n; 624 } 625 626 static int hwmon_genattrs(const void *drvdata, 627 struct attribute **attrs, 628 const struct hwmon_ops *ops, 629 const struct hwmon_channel_info *info) 630 { 631 const char * const *templates; 632 int template_size; 633 int i, aindex = 0; 634 635 if (info->type >= ARRAY_SIZE(__templates)) 636 return -EINVAL; 637 638 templates = __templates[info->type]; 639 template_size = __templates_size[info->type]; 640 641 for (i = 0; info->config[i]; i++) { 642 u32 attr_mask = info->config[i]; 643 u32 attr; 644 645 while (attr_mask) { 646 struct attribute *a; 647 648 attr = __ffs(attr_mask); 649 attr_mask &= ~BIT(attr); 650 if (attr >= template_size) 651 return -EINVAL; 652 a = hwmon_genattr(drvdata, info->type, attr, i, 653 templates[attr], ops); 654 if (IS_ERR(a)) { 655 if (PTR_ERR(a) != -ENOENT) 656 return PTR_ERR(a); 657 continue; 658 } 659 attrs[aindex++] = a; 660 } 661 } 662 return aindex; 663 } 664 665 static struct attribute ** 666 __hwmon_create_attrs(const void *drvdata, const struct hwmon_chip_info *chip) 667 { 668 int ret, i, aindex = 0, nattrs = 0; 669 struct attribute **attrs; 670 671 for (i = 0; chip->info[i]; i++) 672 nattrs += hwmon_num_channel_attrs(chip->info[i]); 673 674 if (nattrs == 0) 675 return ERR_PTR(-EINVAL); 676 677 attrs = kcalloc(nattrs + 1, sizeof(*attrs), GFP_KERNEL); 678 if (!attrs) 679 return ERR_PTR(-ENOMEM); 680 681 for (i = 0; chip->info[i]; i++) { 682 ret = hwmon_genattrs(drvdata, &attrs[aindex], chip->ops, 683 chip->info[i]); 684 if (ret < 0) { 685 hwmon_free_attrs(attrs); 686 return ERR_PTR(ret); 687 } 688 aindex += ret; 689 } 690 691 return attrs; 692 } 693 694 static struct device * 695 __hwmon_device_register(struct device *dev, const char *name, void *drvdata, 696 const struct hwmon_chip_info *chip, 697 const struct attribute_group **groups) 698 { 699 struct hwmon_device *hwdev; 700 struct device *hdev; 701 int i, err, id; 702 703 /* Complain about invalid characters in hwmon name attribute */ 704 if (name && (!strlen(name) || strpbrk(name, "-* \t\n"))) 705 dev_warn(dev, 706 "hwmon: '%s' is not a valid name attribute, please fix\n", 707 name); 708 709 id = ida_simple_get(&hwmon_ida, 0, 0, GFP_KERNEL); 710 if (id < 0) 711 return ERR_PTR(id); 712 713 hwdev = kzalloc(sizeof(*hwdev), GFP_KERNEL); 714 if (hwdev == NULL) { 715 err = -ENOMEM; 716 goto ida_remove; 717 } 718 719 hdev = &hwdev->dev; 720 721 if (chip) { 722 struct attribute **attrs; 723 int ngroups = 2; /* terminating NULL plus &hwdev->groups */ 724 725 if (groups) 726 for (i = 0; groups[i]; i++) 727 ngroups++; 728 729 hwdev->groups = kcalloc(ngroups, sizeof(*groups), GFP_KERNEL); 730 if (!hwdev->groups) { 731 err = -ENOMEM; 732 goto free_hwmon; 733 } 734 735 attrs = __hwmon_create_attrs(drvdata, chip); 736 if (IS_ERR(attrs)) { 737 err = PTR_ERR(attrs); 738 goto free_hwmon; 739 } 740 741 hwdev->group.attrs = attrs; 742 ngroups = 0; 743 hwdev->groups[ngroups++] = &hwdev->group; 744 745 if (groups) { 746 for (i = 0; groups[i]; i++) 747 hwdev->groups[ngroups++] = groups[i]; 748 } 749 750 hdev->groups = hwdev->groups; 751 } else { 752 hdev->groups = groups; 753 } 754 755 hwdev->name = name; 756 hdev->class = &hwmon_class; 757 hdev->parent = dev; 758 hdev->of_node = dev ? dev->of_node : NULL; 759 hwdev->chip = chip; 760 dev_set_drvdata(hdev, drvdata); 761 dev_set_name(hdev, HWMON_ID_FORMAT, id); 762 err = device_register(hdev); 763 if (err) 764 goto free_hwmon; 765 766 INIT_LIST_HEAD(&hwdev->tzdata); 767 768 if (dev && dev->of_node && chip && chip->ops->read && 769 chip->info[0]->type == hwmon_chip && 770 (chip->info[0]->config[0] & HWMON_C_REGISTER_TZ)) { 771 err = hwmon_thermal_register_sensors(hdev); 772 if (err) { 773 device_unregister(hdev); 774 /* 775 * Don't worry about hwdev; hwmon_dev_release(), called 776 * from device_unregister(), will free it. 777 */ 778 goto ida_remove; 779 } 780 } 781 782 return hdev; 783 784 free_hwmon: 785 hwmon_dev_release(hdev); 786 ida_remove: 787 ida_simple_remove(&hwmon_ida, id); 788 return ERR_PTR(err); 789 } 790 791 /** 792 * hwmon_device_register_with_groups - register w/ hwmon 793 * @dev: the parent device 794 * @name: hwmon name attribute 795 * @drvdata: driver data to attach to created device 796 * @groups: List of attribute groups to create 797 * 798 * hwmon_device_unregister() must be called when the device is no 799 * longer needed. 800 * 801 * Returns the pointer to the new device. 802 */ 803 struct device * 804 hwmon_device_register_with_groups(struct device *dev, const char *name, 805 void *drvdata, 806 const struct attribute_group **groups) 807 { 808 if (!name) 809 return ERR_PTR(-EINVAL); 810 811 return __hwmon_device_register(dev, name, drvdata, NULL, groups); 812 } 813 EXPORT_SYMBOL_GPL(hwmon_device_register_with_groups); 814 815 /** 816 * hwmon_device_register_with_info - register w/ hwmon 817 * @dev: the parent device 818 * @name: hwmon name attribute 819 * @drvdata: driver data to attach to created device 820 * @chip: pointer to hwmon chip information 821 * @extra_groups: pointer to list of additional non-standard attribute groups 822 * 823 * hwmon_device_unregister() must be called when the device is no 824 * longer needed. 825 * 826 * Returns the pointer to the new device. 827 */ 828 struct device * 829 hwmon_device_register_with_info(struct device *dev, const char *name, 830 void *drvdata, 831 const struct hwmon_chip_info *chip, 832 const struct attribute_group **extra_groups) 833 { 834 if (!name) 835 return ERR_PTR(-EINVAL); 836 837 if (chip && (!chip->ops || !chip->ops->is_visible || !chip->info)) 838 return ERR_PTR(-EINVAL); 839 840 if (chip && !dev) 841 return ERR_PTR(-EINVAL); 842 843 return __hwmon_device_register(dev, name, drvdata, chip, extra_groups); 844 } 845 EXPORT_SYMBOL_GPL(hwmon_device_register_with_info); 846 847 /** 848 * hwmon_device_register - register w/ hwmon 849 * @dev: the device to register 850 * 851 * hwmon_device_unregister() must be called when the device is no 852 * longer needed. 853 * 854 * Returns the pointer to the new device. 855 */ 856 struct device *hwmon_device_register(struct device *dev) 857 { 858 dev_warn(dev, 859 "hwmon_device_register() is deprecated. Please convert the driver to use hwmon_device_register_with_info().\n"); 860 861 return __hwmon_device_register(dev, NULL, NULL, NULL, NULL); 862 } 863 EXPORT_SYMBOL_GPL(hwmon_device_register); 864 865 /** 866 * hwmon_device_unregister - removes the previously registered class device 867 * 868 * @dev: the class device to destroy 869 */ 870 void hwmon_device_unregister(struct device *dev) 871 { 872 int id; 873 874 if (likely(sscanf(dev_name(dev), HWMON_ID_FORMAT, &id) == 1)) { 875 device_unregister(dev); 876 ida_simple_remove(&hwmon_ida, id); 877 } else 878 dev_dbg(dev->parent, 879 "hwmon_device_unregister() failed: bad class ID!\n"); 880 } 881 EXPORT_SYMBOL_GPL(hwmon_device_unregister); 882 883 static void devm_hwmon_release(struct device *dev, void *res) 884 { 885 struct device *hwdev = *(struct device **)res; 886 887 hwmon_device_unregister(hwdev); 888 } 889 890 /** 891 * devm_hwmon_device_register_with_groups - register w/ hwmon 892 * @dev: the parent device 893 * @name: hwmon name attribute 894 * @drvdata: driver data to attach to created device 895 * @groups: List of attribute groups to create 896 * 897 * Returns the pointer to the new device. The new device is automatically 898 * unregistered with the parent device. 899 */ 900 struct device * 901 devm_hwmon_device_register_with_groups(struct device *dev, const char *name, 902 void *drvdata, 903 const struct attribute_group **groups) 904 { 905 struct device **ptr, *hwdev; 906 907 if (!dev) 908 return ERR_PTR(-EINVAL); 909 910 ptr = devres_alloc(devm_hwmon_release, sizeof(*ptr), GFP_KERNEL); 911 if (!ptr) 912 return ERR_PTR(-ENOMEM); 913 914 hwdev = hwmon_device_register_with_groups(dev, name, drvdata, groups); 915 if (IS_ERR(hwdev)) 916 goto error; 917 918 *ptr = hwdev; 919 devres_add(dev, ptr); 920 return hwdev; 921 922 error: 923 devres_free(ptr); 924 return hwdev; 925 } 926 EXPORT_SYMBOL_GPL(devm_hwmon_device_register_with_groups); 927 928 /** 929 * devm_hwmon_device_register_with_info - register w/ hwmon 930 * @dev: the parent device 931 * @name: hwmon name attribute 932 * @drvdata: driver data to attach to created device 933 * @chip: pointer to hwmon chip information 934 * @groups: pointer to list of driver specific attribute groups 935 * 936 * Returns the pointer to the new device. The new device is automatically 937 * unregistered with the parent device. 938 */ 939 struct device * 940 devm_hwmon_device_register_with_info(struct device *dev, const char *name, 941 void *drvdata, 942 const struct hwmon_chip_info *chip, 943 const struct attribute_group **groups) 944 { 945 struct device **ptr, *hwdev; 946 947 if (!dev) 948 return ERR_PTR(-EINVAL); 949 950 ptr = devres_alloc(devm_hwmon_release, sizeof(*ptr), GFP_KERNEL); 951 if (!ptr) 952 return ERR_PTR(-ENOMEM); 953 954 hwdev = hwmon_device_register_with_info(dev, name, drvdata, chip, 955 groups); 956 if (IS_ERR(hwdev)) 957 goto error; 958 959 *ptr = hwdev; 960 devres_add(dev, ptr); 961 962 return hwdev; 963 964 error: 965 devres_free(ptr); 966 return hwdev; 967 } 968 EXPORT_SYMBOL_GPL(devm_hwmon_device_register_with_info); 969 970 static int devm_hwmon_match(struct device *dev, void *res, void *data) 971 { 972 struct device **hwdev = res; 973 974 return *hwdev == data; 975 } 976 977 /** 978 * devm_hwmon_device_unregister - removes a previously registered hwmon device 979 * 980 * @dev: the parent device of the device to unregister 981 */ 982 void devm_hwmon_device_unregister(struct device *dev) 983 { 984 WARN_ON(devres_release(dev, devm_hwmon_release, devm_hwmon_match, dev)); 985 } 986 EXPORT_SYMBOL_GPL(devm_hwmon_device_unregister); 987 988 static void __init hwmon_pci_quirks(void) 989 { 990 #if defined CONFIG_X86 && defined CONFIG_PCI 991 struct pci_dev *sb; 992 u16 base; 993 u8 enable; 994 995 /* Open access to 0x295-0x296 on MSI MS-7031 */ 996 sb = pci_get_device(PCI_VENDOR_ID_ATI, 0x436c, NULL); 997 if (sb) { 998 if (sb->subsystem_vendor == 0x1462 && /* MSI */ 999 sb->subsystem_device == 0x0031) { /* MS-7031 */ 1000 pci_read_config_byte(sb, 0x48, &enable); 1001 pci_read_config_word(sb, 0x64, &base); 1002 1003 if (base == 0 && !(enable & BIT(2))) { 1004 dev_info(&sb->dev, 1005 "Opening wide generic port at 0x295\n"); 1006 pci_write_config_word(sb, 0x64, 0x295); 1007 pci_write_config_byte(sb, 0x48, 1008 enable | BIT(2)); 1009 } 1010 } 1011 pci_dev_put(sb); 1012 } 1013 #endif 1014 } 1015 1016 static int __init hwmon_init(void) 1017 { 1018 int err; 1019 1020 hwmon_pci_quirks(); 1021 1022 err = class_register(&hwmon_class); 1023 if (err) { 1024 pr_err("couldn't register hwmon sysfs class\n"); 1025 return err; 1026 } 1027 return 0; 1028 } 1029 1030 static void __exit hwmon_exit(void) 1031 { 1032 class_unregister(&hwmon_class); 1033 } 1034 1035 subsys_initcall(hwmon_init); 1036 module_exit(hwmon_exit); 1037 1038 MODULE_AUTHOR("Mark M. Hoffman <mhoffman@lightlink.com>"); 1039 MODULE_DESCRIPTION("hardware monitoring sysfs/class support"); 1040 MODULE_LICENSE("GPL"); 1041 1042