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 }; 435 436 static const char * const hwmon_in_attr_templates[] = { 437 [hwmon_in_enable] = "in%d_enable", 438 [hwmon_in_input] = "in%d_input", 439 [hwmon_in_min] = "in%d_min", 440 [hwmon_in_max] = "in%d_max", 441 [hwmon_in_lcrit] = "in%d_lcrit", 442 [hwmon_in_crit] = "in%d_crit", 443 [hwmon_in_average] = "in%d_average", 444 [hwmon_in_lowest] = "in%d_lowest", 445 [hwmon_in_highest] = "in%d_highest", 446 [hwmon_in_reset_history] = "in%d_reset_history", 447 [hwmon_in_label] = "in%d_label", 448 [hwmon_in_alarm] = "in%d_alarm", 449 [hwmon_in_min_alarm] = "in%d_min_alarm", 450 [hwmon_in_max_alarm] = "in%d_max_alarm", 451 [hwmon_in_lcrit_alarm] = "in%d_lcrit_alarm", 452 [hwmon_in_crit_alarm] = "in%d_crit_alarm", 453 }; 454 455 static const char * const hwmon_curr_attr_templates[] = { 456 [hwmon_curr_enable] = "curr%d_enable", 457 [hwmon_curr_input] = "curr%d_input", 458 [hwmon_curr_min] = "curr%d_min", 459 [hwmon_curr_max] = "curr%d_max", 460 [hwmon_curr_lcrit] = "curr%d_lcrit", 461 [hwmon_curr_crit] = "curr%d_crit", 462 [hwmon_curr_average] = "curr%d_average", 463 [hwmon_curr_lowest] = "curr%d_lowest", 464 [hwmon_curr_highest] = "curr%d_highest", 465 [hwmon_curr_reset_history] = "curr%d_reset_history", 466 [hwmon_curr_label] = "curr%d_label", 467 [hwmon_curr_alarm] = "curr%d_alarm", 468 [hwmon_curr_min_alarm] = "curr%d_min_alarm", 469 [hwmon_curr_max_alarm] = "curr%d_max_alarm", 470 [hwmon_curr_lcrit_alarm] = "curr%d_lcrit_alarm", 471 [hwmon_curr_crit_alarm] = "curr%d_crit_alarm", 472 }; 473 474 static const char * const hwmon_power_attr_templates[] = { 475 [hwmon_power_enable] = "power%d_enable", 476 [hwmon_power_average] = "power%d_average", 477 [hwmon_power_average_interval] = "power%d_average_interval", 478 [hwmon_power_average_interval_max] = "power%d_interval_max", 479 [hwmon_power_average_interval_min] = "power%d_interval_min", 480 [hwmon_power_average_highest] = "power%d_average_highest", 481 [hwmon_power_average_lowest] = "power%d_average_lowest", 482 [hwmon_power_average_max] = "power%d_average_max", 483 [hwmon_power_average_min] = "power%d_average_min", 484 [hwmon_power_input] = "power%d_input", 485 [hwmon_power_input_highest] = "power%d_input_highest", 486 [hwmon_power_input_lowest] = "power%d_input_lowest", 487 [hwmon_power_reset_history] = "power%d_reset_history", 488 [hwmon_power_accuracy] = "power%d_accuracy", 489 [hwmon_power_cap] = "power%d_cap", 490 [hwmon_power_cap_hyst] = "power%d_cap_hyst", 491 [hwmon_power_cap_max] = "power%d_cap_max", 492 [hwmon_power_cap_min] = "power%d_cap_min", 493 [hwmon_power_min] = "power%d_min", 494 [hwmon_power_max] = "power%d_max", 495 [hwmon_power_lcrit] = "power%d_lcrit", 496 [hwmon_power_crit] = "power%d_crit", 497 [hwmon_power_label] = "power%d_label", 498 [hwmon_power_alarm] = "power%d_alarm", 499 [hwmon_power_cap_alarm] = "power%d_cap_alarm", 500 [hwmon_power_min_alarm] = "power%d_min_alarm", 501 [hwmon_power_max_alarm] = "power%d_max_alarm", 502 [hwmon_power_lcrit_alarm] = "power%d_lcrit_alarm", 503 [hwmon_power_crit_alarm] = "power%d_crit_alarm", 504 }; 505 506 static const char * const hwmon_energy_attr_templates[] = { 507 [hwmon_energy_enable] = "energy%d_enable", 508 [hwmon_energy_input] = "energy%d_input", 509 [hwmon_energy_label] = "energy%d_label", 510 }; 511 512 static const char * const hwmon_humidity_attr_templates[] = { 513 [hwmon_humidity_enable] = "humidity%d_enable", 514 [hwmon_humidity_input] = "humidity%d_input", 515 [hwmon_humidity_label] = "humidity%d_label", 516 [hwmon_humidity_min] = "humidity%d_min", 517 [hwmon_humidity_min_hyst] = "humidity%d_min_hyst", 518 [hwmon_humidity_max] = "humidity%d_max", 519 [hwmon_humidity_max_hyst] = "humidity%d_max_hyst", 520 [hwmon_humidity_alarm] = "humidity%d_alarm", 521 [hwmon_humidity_fault] = "humidity%d_fault", 522 }; 523 524 static const char * const hwmon_fan_attr_templates[] = { 525 [hwmon_fan_enable] = "fan%d_enable", 526 [hwmon_fan_input] = "fan%d_input", 527 [hwmon_fan_label] = "fan%d_label", 528 [hwmon_fan_min] = "fan%d_min", 529 [hwmon_fan_max] = "fan%d_max", 530 [hwmon_fan_div] = "fan%d_div", 531 [hwmon_fan_pulses] = "fan%d_pulses", 532 [hwmon_fan_target] = "fan%d_target", 533 [hwmon_fan_alarm] = "fan%d_alarm", 534 [hwmon_fan_min_alarm] = "fan%d_min_alarm", 535 [hwmon_fan_max_alarm] = "fan%d_max_alarm", 536 [hwmon_fan_fault] = "fan%d_fault", 537 }; 538 539 static const char * const hwmon_pwm_attr_templates[] = { 540 [hwmon_pwm_input] = "pwm%d", 541 [hwmon_pwm_enable] = "pwm%d_enable", 542 [hwmon_pwm_mode] = "pwm%d_mode", 543 [hwmon_pwm_freq] = "pwm%d_freq", 544 }; 545 546 static const char * const hwmon_intrusion_attr_templates[] = { 547 [hwmon_intrusion_alarm] = "intrusion%d_alarm", 548 [hwmon_intrusion_beep] = "intrusion%d_beep", 549 }; 550 551 static const char * const *__templates[] = { 552 [hwmon_chip] = hwmon_chip_attrs, 553 [hwmon_temp] = hwmon_temp_attr_templates, 554 [hwmon_in] = hwmon_in_attr_templates, 555 [hwmon_curr] = hwmon_curr_attr_templates, 556 [hwmon_power] = hwmon_power_attr_templates, 557 [hwmon_energy] = hwmon_energy_attr_templates, 558 [hwmon_humidity] = hwmon_humidity_attr_templates, 559 [hwmon_fan] = hwmon_fan_attr_templates, 560 [hwmon_pwm] = hwmon_pwm_attr_templates, 561 [hwmon_intrusion] = hwmon_intrusion_attr_templates, 562 }; 563 564 static const int __templates_size[] = { 565 [hwmon_chip] = ARRAY_SIZE(hwmon_chip_attrs), 566 [hwmon_temp] = ARRAY_SIZE(hwmon_temp_attr_templates), 567 [hwmon_in] = ARRAY_SIZE(hwmon_in_attr_templates), 568 [hwmon_curr] = ARRAY_SIZE(hwmon_curr_attr_templates), 569 [hwmon_power] = ARRAY_SIZE(hwmon_power_attr_templates), 570 [hwmon_energy] = ARRAY_SIZE(hwmon_energy_attr_templates), 571 [hwmon_humidity] = ARRAY_SIZE(hwmon_humidity_attr_templates), 572 [hwmon_fan] = ARRAY_SIZE(hwmon_fan_attr_templates), 573 [hwmon_pwm] = ARRAY_SIZE(hwmon_pwm_attr_templates), 574 [hwmon_intrusion] = ARRAY_SIZE(hwmon_intrusion_attr_templates), 575 }; 576 577 int hwmon_notify_event(struct device *dev, enum hwmon_sensor_types type, 578 u32 attr, int channel) 579 { 580 char sattr[MAX_SYSFS_ATTR_NAME_LENGTH]; 581 const char * const *templates; 582 const char *template; 583 int base; 584 585 if (type >= ARRAY_SIZE(__templates)) 586 return -EINVAL; 587 if (attr >= __templates_size[type]) 588 return -EINVAL; 589 590 templates = __templates[type]; 591 template = templates[attr]; 592 593 base = hwmon_attr_base(type); 594 595 scnprintf(sattr, MAX_SYSFS_ATTR_NAME_LENGTH, template, base + channel); 596 sysfs_notify(&dev->kobj, NULL, sattr); 597 kobject_uevent(&dev->kobj, KOBJ_CHANGE); 598 599 if (type == hwmon_temp) 600 hwmon_thermal_notify(dev, channel); 601 602 return 0; 603 } 604 EXPORT_SYMBOL_GPL(hwmon_notify_event); 605 606 static int hwmon_num_channel_attrs(const struct hwmon_channel_info *info) 607 { 608 int i, n; 609 610 for (i = n = 0; info->config[i]; i++) 611 n += hweight32(info->config[i]); 612 613 return n; 614 } 615 616 static int hwmon_genattrs(const void *drvdata, 617 struct attribute **attrs, 618 const struct hwmon_ops *ops, 619 const struct hwmon_channel_info *info) 620 { 621 const char * const *templates; 622 int template_size; 623 int i, aindex = 0; 624 625 if (info->type >= ARRAY_SIZE(__templates)) 626 return -EINVAL; 627 628 templates = __templates[info->type]; 629 template_size = __templates_size[info->type]; 630 631 for (i = 0; info->config[i]; i++) { 632 u32 attr_mask = info->config[i]; 633 u32 attr; 634 635 while (attr_mask) { 636 struct attribute *a; 637 638 attr = __ffs(attr_mask); 639 attr_mask &= ~BIT(attr); 640 if (attr >= template_size) 641 return -EINVAL; 642 a = hwmon_genattr(drvdata, info->type, attr, i, 643 templates[attr], ops); 644 if (IS_ERR(a)) { 645 if (PTR_ERR(a) != -ENOENT) 646 return PTR_ERR(a); 647 continue; 648 } 649 attrs[aindex++] = a; 650 } 651 } 652 return aindex; 653 } 654 655 static struct attribute ** 656 __hwmon_create_attrs(const void *drvdata, const struct hwmon_chip_info *chip) 657 { 658 int ret, i, aindex = 0, nattrs = 0; 659 struct attribute **attrs; 660 661 for (i = 0; chip->info[i]; i++) 662 nattrs += hwmon_num_channel_attrs(chip->info[i]); 663 664 if (nattrs == 0) 665 return ERR_PTR(-EINVAL); 666 667 attrs = kcalloc(nattrs + 1, sizeof(*attrs), GFP_KERNEL); 668 if (!attrs) 669 return ERR_PTR(-ENOMEM); 670 671 for (i = 0; chip->info[i]; i++) { 672 ret = hwmon_genattrs(drvdata, &attrs[aindex], chip->ops, 673 chip->info[i]); 674 if (ret < 0) { 675 hwmon_free_attrs(attrs); 676 return ERR_PTR(ret); 677 } 678 aindex += ret; 679 } 680 681 return attrs; 682 } 683 684 static struct device * 685 __hwmon_device_register(struct device *dev, const char *name, void *drvdata, 686 const struct hwmon_chip_info *chip, 687 const struct attribute_group **groups) 688 { 689 struct hwmon_device *hwdev; 690 struct device *hdev; 691 int i, err, id; 692 693 /* Complain about invalid characters in hwmon name attribute */ 694 if (name && (!strlen(name) || strpbrk(name, "-* \t\n"))) 695 dev_warn(dev, 696 "hwmon: '%s' is not a valid name attribute, please fix\n", 697 name); 698 699 id = ida_simple_get(&hwmon_ida, 0, 0, GFP_KERNEL); 700 if (id < 0) 701 return ERR_PTR(id); 702 703 hwdev = kzalloc(sizeof(*hwdev), GFP_KERNEL); 704 if (hwdev == NULL) { 705 err = -ENOMEM; 706 goto ida_remove; 707 } 708 709 hdev = &hwdev->dev; 710 711 if (chip) { 712 struct attribute **attrs; 713 int ngroups = 2; /* terminating NULL plus &hwdev->groups */ 714 715 if (groups) 716 for (i = 0; groups[i]; i++) 717 ngroups++; 718 719 hwdev->groups = kcalloc(ngroups, sizeof(*groups), GFP_KERNEL); 720 if (!hwdev->groups) { 721 err = -ENOMEM; 722 goto free_hwmon; 723 } 724 725 attrs = __hwmon_create_attrs(drvdata, chip); 726 if (IS_ERR(attrs)) { 727 err = PTR_ERR(attrs); 728 goto free_hwmon; 729 } 730 731 hwdev->group.attrs = attrs; 732 ngroups = 0; 733 hwdev->groups[ngroups++] = &hwdev->group; 734 735 if (groups) { 736 for (i = 0; groups[i]; i++) 737 hwdev->groups[ngroups++] = groups[i]; 738 } 739 740 hdev->groups = hwdev->groups; 741 } else { 742 hdev->groups = groups; 743 } 744 745 hwdev->name = name; 746 hdev->class = &hwmon_class; 747 hdev->parent = dev; 748 hdev->of_node = dev ? dev->of_node : NULL; 749 hwdev->chip = chip; 750 dev_set_drvdata(hdev, drvdata); 751 dev_set_name(hdev, HWMON_ID_FORMAT, id); 752 err = device_register(hdev); 753 if (err) 754 goto free_hwmon; 755 756 INIT_LIST_HEAD(&hwdev->tzdata); 757 758 if (dev && dev->of_node && chip && chip->ops->read && 759 chip->info[0]->type == hwmon_chip && 760 (chip->info[0]->config[0] & HWMON_C_REGISTER_TZ)) { 761 err = hwmon_thermal_register_sensors(hdev); 762 if (err) { 763 device_unregister(hdev); 764 /* 765 * Don't worry about hwdev; hwmon_dev_release(), called 766 * from device_unregister(), will free it. 767 */ 768 goto ida_remove; 769 } 770 } 771 772 return hdev; 773 774 free_hwmon: 775 hwmon_dev_release(hdev); 776 ida_remove: 777 ida_simple_remove(&hwmon_ida, id); 778 return ERR_PTR(err); 779 } 780 781 /** 782 * hwmon_device_register_with_groups - register w/ hwmon 783 * @dev: the parent device 784 * @name: hwmon name attribute 785 * @drvdata: driver data to attach to created device 786 * @groups: List of attribute groups to create 787 * 788 * hwmon_device_unregister() must be called when the device is no 789 * longer needed. 790 * 791 * Returns the pointer to the new device. 792 */ 793 struct device * 794 hwmon_device_register_with_groups(struct device *dev, const char *name, 795 void *drvdata, 796 const struct attribute_group **groups) 797 { 798 if (!name) 799 return ERR_PTR(-EINVAL); 800 801 return __hwmon_device_register(dev, name, drvdata, NULL, groups); 802 } 803 EXPORT_SYMBOL_GPL(hwmon_device_register_with_groups); 804 805 /** 806 * hwmon_device_register_with_info - register w/ hwmon 807 * @dev: the parent device 808 * @name: hwmon name attribute 809 * @drvdata: driver data to attach to created device 810 * @chip: pointer to hwmon chip information 811 * @extra_groups: pointer to list of additional non-standard attribute groups 812 * 813 * hwmon_device_unregister() must be called when the device is no 814 * longer needed. 815 * 816 * Returns the pointer to the new device. 817 */ 818 struct device * 819 hwmon_device_register_with_info(struct device *dev, const char *name, 820 void *drvdata, 821 const struct hwmon_chip_info *chip, 822 const struct attribute_group **extra_groups) 823 { 824 if (!name) 825 return ERR_PTR(-EINVAL); 826 827 if (chip && (!chip->ops || !chip->ops->is_visible || !chip->info)) 828 return ERR_PTR(-EINVAL); 829 830 if (chip && !dev) 831 return ERR_PTR(-EINVAL); 832 833 return __hwmon_device_register(dev, name, drvdata, chip, extra_groups); 834 } 835 EXPORT_SYMBOL_GPL(hwmon_device_register_with_info); 836 837 /** 838 * hwmon_device_register - register w/ hwmon 839 * @dev: the device to register 840 * 841 * hwmon_device_unregister() must be called when the device is no 842 * longer needed. 843 * 844 * Returns the pointer to the new device. 845 */ 846 struct device *hwmon_device_register(struct device *dev) 847 { 848 dev_warn(dev, 849 "hwmon_device_register() is deprecated. Please convert the driver to use hwmon_device_register_with_info().\n"); 850 851 return __hwmon_device_register(dev, NULL, NULL, NULL, NULL); 852 } 853 EXPORT_SYMBOL_GPL(hwmon_device_register); 854 855 /** 856 * hwmon_device_unregister - removes the previously registered class device 857 * 858 * @dev: the class device to destroy 859 */ 860 void hwmon_device_unregister(struct device *dev) 861 { 862 int id; 863 864 if (likely(sscanf(dev_name(dev), HWMON_ID_FORMAT, &id) == 1)) { 865 device_unregister(dev); 866 ida_simple_remove(&hwmon_ida, id); 867 } else 868 dev_dbg(dev->parent, 869 "hwmon_device_unregister() failed: bad class ID!\n"); 870 } 871 EXPORT_SYMBOL_GPL(hwmon_device_unregister); 872 873 static void devm_hwmon_release(struct device *dev, void *res) 874 { 875 struct device *hwdev = *(struct device **)res; 876 877 hwmon_device_unregister(hwdev); 878 } 879 880 /** 881 * devm_hwmon_device_register_with_groups - register w/ hwmon 882 * @dev: the parent device 883 * @name: hwmon name attribute 884 * @drvdata: driver data to attach to created device 885 * @groups: List of attribute groups to create 886 * 887 * Returns the pointer to the new device. The new device is automatically 888 * unregistered with the parent device. 889 */ 890 struct device * 891 devm_hwmon_device_register_with_groups(struct device *dev, const char *name, 892 void *drvdata, 893 const struct attribute_group **groups) 894 { 895 struct device **ptr, *hwdev; 896 897 if (!dev) 898 return ERR_PTR(-EINVAL); 899 900 ptr = devres_alloc(devm_hwmon_release, sizeof(*ptr), GFP_KERNEL); 901 if (!ptr) 902 return ERR_PTR(-ENOMEM); 903 904 hwdev = hwmon_device_register_with_groups(dev, name, drvdata, groups); 905 if (IS_ERR(hwdev)) 906 goto error; 907 908 *ptr = hwdev; 909 devres_add(dev, ptr); 910 return hwdev; 911 912 error: 913 devres_free(ptr); 914 return hwdev; 915 } 916 EXPORT_SYMBOL_GPL(devm_hwmon_device_register_with_groups); 917 918 /** 919 * devm_hwmon_device_register_with_info - register w/ hwmon 920 * @dev: the parent device 921 * @name: hwmon name attribute 922 * @drvdata: driver data to attach to created device 923 * @chip: pointer to hwmon chip information 924 * @groups: pointer to list of driver specific attribute groups 925 * 926 * Returns the pointer to the new device. The new device is automatically 927 * unregistered with the parent device. 928 */ 929 struct device * 930 devm_hwmon_device_register_with_info(struct device *dev, const char *name, 931 void *drvdata, 932 const struct hwmon_chip_info *chip, 933 const struct attribute_group **groups) 934 { 935 struct device **ptr, *hwdev; 936 937 if (!dev) 938 return ERR_PTR(-EINVAL); 939 940 ptr = devres_alloc(devm_hwmon_release, sizeof(*ptr), GFP_KERNEL); 941 if (!ptr) 942 return ERR_PTR(-ENOMEM); 943 944 hwdev = hwmon_device_register_with_info(dev, name, drvdata, chip, 945 groups); 946 if (IS_ERR(hwdev)) 947 goto error; 948 949 *ptr = hwdev; 950 devres_add(dev, ptr); 951 952 return hwdev; 953 954 error: 955 devres_free(ptr); 956 return hwdev; 957 } 958 EXPORT_SYMBOL_GPL(devm_hwmon_device_register_with_info); 959 960 static int devm_hwmon_match(struct device *dev, void *res, void *data) 961 { 962 struct device **hwdev = res; 963 964 return *hwdev == data; 965 } 966 967 /** 968 * devm_hwmon_device_unregister - removes a previously registered hwmon device 969 * 970 * @dev: the parent device of the device to unregister 971 */ 972 void devm_hwmon_device_unregister(struct device *dev) 973 { 974 WARN_ON(devres_release(dev, devm_hwmon_release, devm_hwmon_match, dev)); 975 } 976 EXPORT_SYMBOL_GPL(devm_hwmon_device_unregister); 977 978 static void __init hwmon_pci_quirks(void) 979 { 980 #if defined CONFIG_X86 && defined CONFIG_PCI 981 struct pci_dev *sb; 982 u16 base; 983 u8 enable; 984 985 /* Open access to 0x295-0x296 on MSI MS-7031 */ 986 sb = pci_get_device(PCI_VENDOR_ID_ATI, 0x436c, NULL); 987 if (sb) { 988 if (sb->subsystem_vendor == 0x1462 && /* MSI */ 989 sb->subsystem_device == 0x0031) { /* MS-7031 */ 990 pci_read_config_byte(sb, 0x48, &enable); 991 pci_read_config_word(sb, 0x64, &base); 992 993 if (base == 0 && !(enable & BIT(2))) { 994 dev_info(&sb->dev, 995 "Opening wide generic port at 0x295\n"); 996 pci_write_config_word(sb, 0x64, 0x295); 997 pci_write_config_byte(sb, 0x48, 998 enable | BIT(2)); 999 } 1000 } 1001 pci_dev_put(sb); 1002 } 1003 #endif 1004 } 1005 1006 static int __init hwmon_init(void) 1007 { 1008 int err; 1009 1010 hwmon_pci_quirks(); 1011 1012 err = class_register(&hwmon_class); 1013 if (err) { 1014 pr_err("couldn't register hwmon sysfs class\n"); 1015 return err; 1016 } 1017 return 0; 1018 } 1019 1020 static void __exit hwmon_exit(void) 1021 { 1022 class_unregister(&hwmon_class); 1023 } 1024 1025 subsys_initcall(hwmon_init); 1026 module_exit(hwmon_exit); 1027 1028 MODULE_AUTHOR("Mark M. Hoffman <mhoffman@lightlink.com>"); 1029 MODULE_DESCRIPTION("hardware monitoring sysfs/class support"); 1030 MODULE_LICENSE("GPL"); 1031 1032