1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * A hwmon driver for ACPI 4.0 power meters 4 * Copyright (C) 2009 IBM 5 * 6 * Author: Darrick J. Wong <darrick.wong@oracle.com> 7 */ 8 9 #include <linux/module.h> 10 #include <linux/hwmon.h> 11 #include <linux/hwmon-sysfs.h> 12 #include <linux/jiffies.h> 13 #include <linux/mutex.h> 14 #include <linux/dmi.h> 15 #include <linux/slab.h> 16 #include <linux/kdev_t.h> 17 #include <linux/sched.h> 18 #include <linux/time.h> 19 #include <linux/err.h> 20 #include <linux/acpi.h> 21 22 #define ACPI_POWER_METER_NAME "power_meter" 23 #define ACPI_POWER_METER_DEVICE_NAME "Power Meter" 24 #define ACPI_POWER_METER_CLASS "pwr_meter_resource" 25 26 #define NUM_SENSORS 17 27 28 #define POWER_METER_CAN_MEASURE (1 << 0) 29 #define POWER_METER_CAN_TRIP (1 << 1) 30 #define POWER_METER_CAN_CAP (1 << 2) 31 #define POWER_METER_CAN_NOTIFY (1 << 3) 32 #define POWER_METER_IS_BATTERY (1 << 8) 33 #define UNKNOWN_HYSTERESIS 0xFFFFFFFF 34 35 #define METER_NOTIFY_CONFIG 0x80 36 #define METER_NOTIFY_TRIP 0x81 37 #define METER_NOTIFY_CAP 0x82 38 #define METER_NOTIFY_CAPPING 0x83 39 #define METER_NOTIFY_INTERVAL 0x84 40 41 #define POWER_AVERAGE_NAME "power1_average" 42 #define POWER_CAP_NAME "power1_cap" 43 #define POWER_AVG_INTERVAL_NAME "power1_average_interval" 44 #define POWER_ALARM_NAME "power1_alarm" 45 46 static int cap_in_hardware; 47 static bool force_cap_on; 48 49 static int can_cap_in_hardware(void) 50 { 51 return force_cap_on || cap_in_hardware; 52 } 53 54 static const struct acpi_device_id power_meter_ids[] = { 55 {"ACPI000D", 0}, 56 {"", 0}, 57 }; 58 MODULE_DEVICE_TABLE(acpi, power_meter_ids); 59 60 struct acpi_power_meter_capabilities { 61 u64 flags; 62 u64 units; 63 u64 type; 64 u64 accuracy; 65 u64 sampling_time; 66 u64 min_avg_interval; 67 u64 max_avg_interval; 68 u64 hysteresis; 69 u64 configurable_cap; 70 u64 min_cap; 71 u64 max_cap; 72 }; 73 74 struct acpi_power_meter_resource { 75 struct acpi_device *acpi_dev; 76 acpi_bus_id name; 77 struct mutex lock; 78 struct device *hwmon_dev; 79 struct acpi_power_meter_capabilities caps; 80 acpi_string model_number; 81 acpi_string serial_number; 82 acpi_string oem_info; 83 u64 power; 84 u64 cap; 85 u64 avg_interval; 86 int sensors_valid; 87 unsigned long sensors_last_updated; 88 struct sensor_device_attribute sensors[NUM_SENSORS]; 89 int num_sensors; 90 s64 trip[2]; 91 int num_domain_devices; 92 struct acpi_device **domain_devices; 93 struct kobject *holders_dir; 94 }; 95 96 struct sensor_template { 97 char *label; 98 ssize_t (*show)(struct device *dev, 99 struct device_attribute *devattr, 100 char *buf); 101 ssize_t (*set)(struct device *dev, 102 struct device_attribute *devattr, 103 const char *buf, size_t count); 104 int index; 105 }; 106 107 /* Averaging interval */ 108 static int update_avg_interval(struct acpi_power_meter_resource *resource) 109 { 110 unsigned long long data; 111 acpi_status status; 112 113 status = acpi_evaluate_integer(resource->acpi_dev->handle, "_GAI", 114 NULL, &data); 115 if (ACPI_FAILURE(status)) { 116 acpi_evaluation_failure_warn(resource->acpi_dev->handle, "_GAI", 117 status); 118 return -ENODEV; 119 } 120 121 resource->avg_interval = data; 122 return 0; 123 } 124 125 static ssize_t show_avg_interval(struct device *dev, 126 struct device_attribute *devattr, 127 char *buf) 128 { 129 struct acpi_device *acpi_dev = to_acpi_device(dev); 130 struct acpi_power_meter_resource *resource = acpi_dev->driver_data; 131 132 mutex_lock(&resource->lock); 133 update_avg_interval(resource); 134 mutex_unlock(&resource->lock); 135 136 return sprintf(buf, "%llu\n", resource->avg_interval); 137 } 138 139 static ssize_t set_avg_interval(struct device *dev, 140 struct device_attribute *devattr, 141 const char *buf, size_t count) 142 { 143 struct acpi_device *acpi_dev = to_acpi_device(dev); 144 struct acpi_power_meter_resource *resource = acpi_dev->driver_data; 145 union acpi_object arg0 = { ACPI_TYPE_INTEGER }; 146 struct acpi_object_list args = { 1, &arg0 }; 147 int res; 148 unsigned long temp; 149 unsigned long long data; 150 acpi_status status; 151 152 res = kstrtoul(buf, 10, &temp); 153 if (res) 154 return res; 155 156 if (temp > resource->caps.max_avg_interval || 157 temp < resource->caps.min_avg_interval) 158 return -EINVAL; 159 arg0.integer.value = temp; 160 161 mutex_lock(&resource->lock); 162 status = acpi_evaluate_integer(resource->acpi_dev->handle, "_PAI", 163 &args, &data); 164 if (ACPI_SUCCESS(status)) 165 resource->avg_interval = temp; 166 mutex_unlock(&resource->lock); 167 168 if (ACPI_FAILURE(status)) { 169 acpi_evaluation_failure_warn(resource->acpi_dev->handle, "_PAI", 170 status); 171 return -EINVAL; 172 } 173 174 /* _PAI returns 0 on success, nonzero otherwise */ 175 if (data) 176 return -EINVAL; 177 178 return count; 179 } 180 181 /* Cap functions */ 182 static int update_cap(struct acpi_power_meter_resource *resource) 183 { 184 unsigned long long data; 185 acpi_status status; 186 187 status = acpi_evaluate_integer(resource->acpi_dev->handle, "_GHL", 188 NULL, &data); 189 if (ACPI_FAILURE(status)) { 190 acpi_evaluation_failure_warn(resource->acpi_dev->handle, "_GHL", 191 status); 192 return -ENODEV; 193 } 194 195 resource->cap = data; 196 return 0; 197 } 198 199 static ssize_t show_cap(struct device *dev, 200 struct device_attribute *devattr, 201 char *buf) 202 { 203 struct acpi_device *acpi_dev = to_acpi_device(dev); 204 struct acpi_power_meter_resource *resource = acpi_dev->driver_data; 205 206 mutex_lock(&resource->lock); 207 update_cap(resource); 208 mutex_unlock(&resource->lock); 209 210 return sprintf(buf, "%llu\n", resource->cap * 1000); 211 } 212 213 static ssize_t set_cap(struct device *dev, struct device_attribute *devattr, 214 const char *buf, size_t count) 215 { 216 struct acpi_device *acpi_dev = to_acpi_device(dev); 217 struct acpi_power_meter_resource *resource = acpi_dev->driver_data; 218 union acpi_object arg0 = { ACPI_TYPE_INTEGER }; 219 struct acpi_object_list args = { 1, &arg0 }; 220 int res; 221 unsigned long temp; 222 unsigned long long data; 223 acpi_status status; 224 225 res = kstrtoul(buf, 10, &temp); 226 if (res) 227 return res; 228 229 temp = DIV_ROUND_CLOSEST(temp, 1000); 230 if (temp > resource->caps.max_cap || temp < resource->caps.min_cap) 231 return -EINVAL; 232 arg0.integer.value = temp; 233 234 mutex_lock(&resource->lock); 235 status = acpi_evaluate_integer(resource->acpi_dev->handle, "_SHL", 236 &args, &data); 237 if (ACPI_SUCCESS(status)) 238 resource->cap = temp; 239 mutex_unlock(&resource->lock); 240 241 if (ACPI_FAILURE(status)) { 242 acpi_evaluation_failure_warn(resource->acpi_dev->handle, "_SHL", 243 status); 244 return -EINVAL; 245 } 246 247 /* _SHL returns 0 on success, nonzero otherwise */ 248 if (data) 249 return -EINVAL; 250 251 return count; 252 } 253 254 /* Power meter trip points */ 255 static int set_acpi_trip(struct acpi_power_meter_resource *resource) 256 { 257 union acpi_object arg_objs[] = { 258 {ACPI_TYPE_INTEGER}, 259 {ACPI_TYPE_INTEGER} 260 }; 261 struct acpi_object_list args = { 2, arg_objs }; 262 unsigned long long data; 263 acpi_status status; 264 265 /* Both trip levels must be set */ 266 if (resource->trip[0] < 0 || resource->trip[1] < 0) 267 return 0; 268 269 /* This driver stores min, max; ACPI wants max, min. */ 270 arg_objs[0].integer.value = resource->trip[1]; 271 arg_objs[1].integer.value = resource->trip[0]; 272 273 status = acpi_evaluate_integer(resource->acpi_dev->handle, "_PTP", 274 &args, &data); 275 if (ACPI_FAILURE(status)) { 276 acpi_evaluation_failure_warn(resource->acpi_dev->handle, "_PTP", 277 status); 278 return -EINVAL; 279 } 280 281 /* _PTP returns 0 on success, nonzero otherwise */ 282 if (data) 283 return -EINVAL; 284 285 return 0; 286 } 287 288 static ssize_t set_trip(struct device *dev, struct device_attribute *devattr, 289 const char *buf, size_t count) 290 { 291 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 292 struct acpi_device *acpi_dev = to_acpi_device(dev); 293 struct acpi_power_meter_resource *resource = acpi_dev->driver_data; 294 int res; 295 unsigned long temp; 296 297 res = kstrtoul(buf, 10, &temp); 298 if (res) 299 return res; 300 301 temp = DIV_ROUND_CLOSEST(temp, 1000); 302 303 mutex_lock(&resource->lock); 304 resource->trip[attr->index - 7] = temp; 305 res = set_acpi_trip(resource); 306 mutex_unlock(&resource->lock); 307 308 if (res) 309 return res; 310 311 return count; 312 } 313 314 /* Power meter */ 315 static int update_meter(struct acpi_power_meter_resource *resource) 316 { 317 unsigned long long data; 318 acpi_status status; 319 unsigned long local_jiffies = jiffies; 320 321 if (time_before(local_jiffies, resource->sensors_last_updated + 322 msecs_to_jiffies(resource->caps.sampling_time)) && 323 resource->sensors_valid) 324 return 0; 325 326 status = acpi_evaluate_integer(resource->acpi_dev->handle, "_PMM", 327 NULL, &data); 328 if (ACPI_FAILURE(status)) { 329 acpi_evaluation_failure_warn(resource->acpi_dev->handle, "_PMM", 330 status); 331 return -ENODEV; 332 } 333 334 resource->power = data; 335 resource->sensors_valid = 1; 336 resource->sensors_last_updated = jiffies; 337 return 0; 338 } 339 340 static ssize_t show_power(struct device *dev, 341 struct device_attribute *devattr, 342 char *buf) 343 { 344 struct acpi_device *acpi_dev = to_acpi_device(dev); 345 struct acpi_power_meter_resource *resource = acpi_dev->driver_data; 346 347 mutex_lock(&resource->lock); 348 update_meter(resource); 349 mutex_unlock(&resource->lock); 350 351 return sprintf(buf, "%llu\n", resource->power * 1000); 352 } 353 354 /* Miscellaneous */ 355 static ssize_t show_str(struct device *dev, 356 struct device_attribute *devattr, 357 char *buf) 358 { 359 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 360 struct acpi_device *acpi_dev = to_acpi_device(dev); 361 struct acpi_power_meter_resource *resource = acpi_dev->driver_data; 362 acpi_string val; 363 int ret; 364 365 mutex_lock(&resource->lock); 366 switch (attr->index) { 367 case 0: 368 val = resource->model_number; 369 break; 370 case 1: 371 val = resource->serial_number; 372 break; 373 case 2: 374 val = resource->oem_info; 375 break; 376 default: 377 WARN(1, "Implementation error: unexpected attribute index %d\n", 378 attr->index); 379 val = ""; 380 break; 381 } 382 ret = sprintf(buf, "%s\n", val); 383 mutex_unlock(&resource->lock); 384 return ret; 385 } 386 387 static ssize_t show_val(struct device *dev, 388 struct device_attribute *devattr, 389 char *buf) 390 { 391 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 392 struct acpi_device *acpi_dev = to_acpi_device(dev); 393 struct acpi_power_meter_resource *resource = acpi_dev->driver_data; 394 u64 val = 0; 395 396 switch (attr->index) { 397 case 0: 398 val = resource->caps.min_avg_interval; 399 break; 400 case 1: 401 val = resource->caps.max_avg_interval; 402 break; 403 case 2: 404 val = resource->caps.min_cap * 1000; 405 break; 406 case 3: 407 val = resource->caps.max_cap * 1000; 408 break; 409 case 4: 410 if (resource->caps.hysteresis == UNKNOWN_HYSTERESIS) 411 return sprintf(buf, "unknown\n"); 412 413 val = resource->caps.hysteresis * 1000; 414 break; 415 case 5: 416 if (resource->caps.flags & POWER_METER_IS_BATTERY) 417 val = 1; 418 else 419 val = 0; 420 break; 421 case 6: 422 if (resource->power > resource->cap) 423 val = 1; 424 else 425 val = 0; 426 break; 427 case 7: 428 case 8: 429 if (resource->trip[attr->index - 7] < 0) 430 return sprintf(buf, "unknown\n"); 431 432 val = resource->trip[attr->index - 7] * 1000; 433 break; 434 default: 435 WARN(1, "Implementation error: unexpected attribute index %d\n", 436 attr->index); 437 break; 438 } 439 440 return sprintf(buf, "%llu\n", val); 441 } 442 443 static ssize_t show_accuracy(struct device *dev, 444 struct device_attribute *devattr, 445 char *buf) 446 { 447 struct acpi_device *acpi_dev = to_acpi_device(dev); 448 struct acpi_power_meter_resource *resource = acpi_dev->driver_data; 449 unsigned int acc = resource->caps.accuracy; 450 451 return sprintf(buf, "%u.%u%%\n", acc / 1000, acc % 1000); 452 } 453 454 static ssize_t show_name(struct device *dev, 455 struct device_attribute *devattr, 456 char *buf) 457 { 458 return sprintf(buf, "%s\n", ACPI_POWER_METER_NAME); 459 } 460 461 #define RO_SENSOR_TEMPLATE(_label, _show, _index) \ 462 { \ 463 .label = _label, \ 464 .show = _show, \ 465 .index = _index, \ 466 } 467 468 #define RW_SENSOR_TEMPLATE(_label, _show, _set, _index) \ 469 { \ 470 .label = _label, \ 471 .show = _show, \ 472 .set = _set, \ 473 .index = _index, \ 474 } 475 476 /* Sensor descriptions. If you add a sensor, update NUM_SENSORS above! */ 477 static struct sensor_template meter_attrs[] = { 478 RO_SENSOR_TEMPLATE(POWER_AVERAGE_NAME, show_power, 0), 479 RO_SENSOR_TEMPLATE("power1_accuracy", show_accuracy, 0), 480 RO_SENSOR_TEMPLATE("power1_average_interval_min", show_val, 0), 481 RO_SENSOR_TEMPLATE("power1_average_interval_max", show_val, 1), 482 RO_SENSOR_TEMPLATE("power1_is_battery", show_val, 5), 483 RW_SENSOR_TEMPLATE(POWER_AVG_INTERVAL_NAME, show_avg_interval, 484 set_avg_interval, 0), 485 {}, 486 }; 487 488 static struct sensor_template misc_cap_attrs[] = { 489 RO_SENSOR_TEMPLATE("power1_cap_min", show_val, 2), 490 RO_SENSOR_TEMPLATE("power1_cap_max", show_val, 3), 491 RO_SENSOR_TEMPLATE("power1_cap_hyst", show_val, 4), 492 RO_SENSOR_TEMPLATE(POWER_ALARM_NAME, show_val, 6), 493 {}, 494 }; 495 496 static struct sensor_template ro_cap_attrs[] = { 497 RO_SENSOR_TEMPLATE(POWER_CAP_NAME, show_cap, 0), 498 {}, 499 }; 500 501 static struct sensor_template rw_cap_attrs[] = { 502 RW_SENSOR_TEMPLATE(POWER_CAP_NAME, show_cap, set_cap, 0), 503 {}, 504 }; 505 506 static struct sensor_template trip_attrs[] = { 507 RW_SENSOR_TEMPLATE("power1_average_min", show_val, set_trip, 7), 508 RW_SENSOR_TEMPLATE("power1_average_max", show_val, set_trip, 8), 509 {}, 510 }; 511 512 static struct sensor_template misc_attrs[] = { 513 RO_SENSOR_TEMPLATE("name", show_name, 0), 514 RO_SENSOR_TEMPLATE("power1_model_number", show_str, 0), 515 RO_SENSOR_TEMPLATE("power1_oem_info", show_str, 2), 516 RO_SENSOR_TEMPLATE("power1_serial_number", show_str, 1), 517 {}, 518 }; 519 520 #undef RO_SENSOR_TEMPLATE 521 #undef RW_SENSOR_TEMPLATE 522 523 /* Read power domain data */ 524 static void remove_domain_devices(struct acpi_power_meter_resource *resource) 525 { 526 int i; 527 528 if (!resource->num_domain_devices) 529 return; 530 531 for (i = 0; i < resource->num_domain_devices; i++) { 532 struct acpi_device *obj = resource->domain_devices[i]; 533 534 if (!obj) 535 continue; 536 537 sysfs_remove_link(resource->holders_dir, 538 kobject_name(&obj->dev.kobj)); 539 acpi_dev_put(obj); 540 } 541 542 kfree(resource->domain_devices); 543 kobject_put(resource->holders_dir); 544 resource->num_domain_devices = 0; 545 } 546 547 static int read_domain_devices(struct acpi_power_meter_resource *resource) 548 { 549 int res = 0; 550 int i; 551 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 552 union acpi_object *pss; 553 acpi_status status; 554 555 status = acpi_evaluate_object(resource->acpi_dev->handle, "_PMD", NULL, 556 &buffer); 557 if (ACPI_FAILURE(status)) { 558 acpi_evaluation_failure_warn(resource->acpi_dev->handle, "_PMD", 559 status); 560 return -ENODEV; 561 } 562 563 pss = buffer.pointer; 564 if (!pss || 565 pss->type != ACPI_TYPE_PACKAGE) { 566 dev_err(&resource->acpi_dev->dev, ACPI_POWER_METER_NAME 567 "Invalid _PMD data\n"); 568 res = -EFAULT; 569 goto end; 570 } 571 572 if (!pss->package.count) 573 goto end; 574 575 resource->domain_devices = kcalloc(pss->package.count, 576 sizeof(struct acpi_device *), 577 GFP_KERNEL); 578 if (!resource->domain_devices) { 579 res = -ENOMEM; 580 goto end; 581 } 582 583 resource->holders_dir = kobject_create_and_add("measures", 584 &resource->acpi_dev->dev.kobj); 585 if (!resource->holders_dir) { 586 res = -ENOMEM; 587 goto exit_free; 588 } 589 590 resource->num_domain_devices = pss->package.count; 591 592 for (i = 0; i < pss->package.count; i++) { 593 struct acpi_device *obj; 594 union acpi_object *element = &pss->package.elements[i]; 595 596 /* Refuse non-references */ 597 if (element->type != ACPI_TYPE_LOCAL_REFERENCE) 598 continue; 599 600 /* Create a symlink to domain objects */ 601 obj = acpi_get_acpi_dev(element->reference.handle); 602 resource->domain_devices[i] = obj; 603 if (!obj) 604 continue; 605 606 res = sysfs_create_link(resource->holders_dir, &obj->dev.kobj, 607 kobject_name(&obj->dev.kobj)); 608 if (res) { 609 acpi_dev_put(obj); 610 resource->domain_devices[i] = NULL; 611 } 612 } 613 614 res = 0; 615 goto end; 616 617 exit_free: 618 kfree(resource->domain_devices); 619 end: 620 kfree(buffer.pointer); 621 return res; 622 } 623 624 /* Registration and deregistration */ 625 static int register_attrs(struct acpi_power_meter_resource *resource, 626 struct sensor_template *attrs) 627 { 628 struct device *dev = &resource->acpi_dev->dev; 629 struct sensor_device_attribute *sensors = 630 &resource->sensors[resource->num_sensors]; 631 int res = 0; 632 633 while (attrs->label) { 634 sensors->dev_attr.attr.name = attrs->label; 635 sensors->dev_attr.attr.mode = 0444; 636 sensors->dev_attr.show = attrs->show; 637 sensors->index = attrs->index; 638 639 if (attrs->set) { 640 sensors->dev_attr.attr.mode |= 0200; 641 sensors->dev_attr.store = attrs->set; 642 } 643 644 sysfs_attr_init(&sensors->dev_attr.attr); 645 res = device_create_file(dev, &sensors->dev_attr); 646 if (res) { 647 sensors->dev_attr.attr.name = NULL; 648 goto error; 649 } 650 sensors++; 651 resource->num_sensors++; 652 attrs++; 653 } 654 655 error: 656 return res; 657 } 658 659 static void remove_attrs(struct acpi_power_meter_resource *resource) 660 { 661 int i; 662 663 for (i = 0; i < resource->num_sensors; i++) { 664 if (!resource->sensors[i].dev_attr.attr.name) 665 continue; 666 device_remove_file(&resource->acpi_dev->dev, 667 &resource->sensors[i].dev_attr); 668 } 669 670 remove_domain_devices(resource); 671 672 resource->num_sensors = 0; 673 } 674 675 static int setup_attrs(struct acpi_power_meter_resource *resource) 676 { 677 int res = 0; 678 679 res = read_domain_devices(resource); 680 if (res) 681 return res; 682 683 if (resource->caps.flags & POWER_METER_CAN_MEASURE) { 684 res = register_attrs(resource, meter_attrs); 685 if (res) 686 goto error; 687 } 688 689 if (resource->caps.flags & POWER_METER_CAN_CAP) { 690 if (!can_cap_in_hardware()) { 691 dev_warn(&resource->acpi_dev->dev, 692 "Ignoring unsafe software power cap!\n"); 693 goto skip_unsafe_cap; 694 } 695 696 if (resource->caps.configurable_cap) 697 res = register_attrs(resource, rw_cap_attrs); 698 else 699 res = register_attrs(resource, ro_cap_attrs); 700 701 if (res) 702 goto error; 703 704 res = register_attrs(resource, misc_cap_attrs); 705 if (res) 706 goto error; 707 } 708 709 skip_unsafe_cap: 710 if (resource->caps.flags & POWER_METER_CAN_TRIP) { 711 res = register_attrs(resource, trip_attrs); 712 if (res) 713 goto error; 714 } 715 716 res = register_attrs(resource, misc_attrs); 717 if (res) 718 goto error; 719 720 return res; 721 error: 722 remove_attrs(resource); 723 return res; 724 } 725 726 static void free_capabilities(struct acpi_power_meter_resource *resource) 727 { 728 acpi_string *str; 729 int i; 730 731 str = &resource->model_number; 732 for (i = 0; i < 3; i++, str++) { 733 kfree(*str); 734 *str = NULL; 735 } 736 } 737 738 static int read_capabilities(struct acpi_power_meter_resource *resource) 739 { 740 int res = 0; 741 int i; 742 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 743 struct acpi_buffer state = { 0, NULL }; 744 struct acpi_buffer format = { sizeof("NNNNNNNNNNN"), "NNNNNNNNNNN" }; 745 union acpi_object *pss; 746 acpi_string *str; 747 acpi_status status; 748 749 status = acpi_evaluate_object(resource->acpi_dev->handle, "_PMC", NULL, 750 &buffer); 751 if (ACPI_FAILURE(status)) { 752 acpi_evaluation_failure_warn(resource->acpi_dev->handle, "_PMC", 753 status); 754 return -ENODEV; 755 } 756 757 pss = buffer.pointer; 758 if (!pss || 759 pss->type != ACPI_TYPE_PACKAGE || 760 pss->package.count != 14) { 761 dev_err(&resource->acpi_dev->dev, ACPI_POWER_METER_NAME 762 "Invalid _PMC data\n"); 763 res = -EFAULT; 764 goto end; 765 } 766 767 /* Grab all the integer data at once */ 768 state.length = sizeof(struct acpi_power_meter_capabilities); 769 state.pointer = &resource->caps; 770 771 status = acpi_extract_package(pss, &format, &state); 772 if (ACPI_FAILURE(status)) { 773 dev_err(&resource->acpi_dev->dev, ACPI_POWER_METER_NAME 774 "_PMC package parsing failed: %s\n", 775 acpi_format_exception(status)); 776 res = -EFAULT; 777 goto end; 778 } 779 780 if (resource->caps.units) { 781 dev_err(&resource->acpi_dev->dev, ACPI_POWER_METER_NAME 782 "Unknown units %llu.\n", 783 resource->caps.units); 784 res = -EINVAL; 785 goto end; 786 } 787 788 /* Grab the string data */ 789 str = &resource->model_number; 790 791 for (i = 11; i < 14; i++) { 792 union acpi_object *element = &pss->package.elements[i]; 793 794 if (element->type != ACPI_TYPE_STRING) { 795 res = -EINVAL; 796 goto error; 797 } 798 799 *str = kcalloc(element->string.length + 1, sizeof(u8), 800 GFP_KERNEL); 801 if (!*str) { 802 res = -ENOMEM; 803 goto error; 804 } 805 806 strncpy(*str, element->string.pointer, element->string.length); 807 str++; 808 } 809 810 dev_info(&resource->acpi_dev->dev, "Found ACPI power meter.\n"); 811 goto end; 812 error: 813 free_capabilities(resource); 814 end: 815 kfree(buffer.pointer); 816 return res; 817 } 818 819 /* Handle ACPI event notifications */ 820 static void acpi_power_meter_notify(struct acpi_device *device, u32 event) 821 { 822 struct acpi_power_meter_resource *resource; 823 int res; 824 825 if (!device || !acpi_driver_data(device)) 826 return; 827 828 resource = acpi_driver_data(device); 829 830 switch (event) { 831 case METER_NOTIFY_CONFIG: 832 mutex_lock(&resource->lock); 833 free_capabilities(resource); 834 res = read_capabilities(resource); 835 mutex_unlock(&resource->lock); 836 if (res) 837 break; 838 839 remove_attrs(resource); 840 setup_attrs(resource); 841 break; 842 case METER_NOTIFY_TRIP: 843 sysfs_notify(&device->dev.kobj, NULL, POWER_AVERAGE_NAME); 844 break; 845 case METER_NOTIFY_CAP: 846 sysfs_notify(&device->dev.kobj, NULL, POWER_CAP_NAME); 847 break; 848 case METER_NOTIFY_INTERVAL: 849 sysfs_notify(&device->dev.kobj, NULL, POWER_AVG_INTERVAL_NAME); 850 break; 851 case METER_NOTIFY_CAPPING: 852 sysfs_notify(&device->dev.kobj, NULL, POWER_ALARM_NAME); 853 dev_info(&device->dev, "Capping in progress.\n"); 854 break; 855 default: 856 WARN(1, "Unexpected event %d\n", event); 857 break; 858 } 859 860 acpi_bus_generate_netlink_event(ACPI_POWER_METER_CLASS, 861 dev_name(&device->dev), event, 0); 862 } 863 864 static int acpi_power_meter_add(struct acpi_device *device) 865 { 866 int res; 867 struct acpi_power_meter_resource *resource; 868 869 if (!device) 870 return -EINVAL; 871 872 resource = kzalloc(sizeof(*resource), GFP_KERNEL); 873 if (!resource) 874 return -ENOMEM; 875 876 resource->sensors_valid = 0; 877 resource->acpi_dev = device; 878 mutex_init(&resource->lock); 879 strcpy(acpi_device_name(device), ACPI_POWER_METER_DEVICE_NAME); 880 strcpy(acpi_device_class(device), ACPI_POWER_METER_CLASS); 881 device->driver_data = resource; 882 883 res = read_capabilities(resource); 884 if (res) 885 goto exit_free; 886 887 resource->trip[0] = -1; 888 resource->trip[1] = -1; 889 890 res = setup_attrs(resource); 891 if (res) 892 goto exit_free_capability; 893 894 resource->hwmon_dev = hwmon_device_register(&device->dev); 895 if (IS_ERR(resource->hwmon_dev)) { 896 res = PTR_ERR(resource->hwmon_dev); 897 goto exit_remove; 898 } 899 900 res = 0; 901 goto exit; 902 903 exit_remove: 904 remove_attrs(resource); 905 exit_free_capability: 906 free_capabilities(resource); 907 exit_free: 908 kfree(resource); 909 exit: 910 return res; 911 } 912 913 static int acpi_power_meter_remove(struct acpi_device *device) 914 { 915 struct acpi_power_meter_resource *resource; 916 917 if (!device || !acpi_driver_data(device)) 918 return -EINVAL; 919 920 resource = acpi_driver_data(device); 921 hwmon_device_unregister(resource->hwmon_dev); 922 923 remove_attrs(resource); 924 free_capabilities(resource); 925 926 kfree(resource); 927 return 0; 928 } 929 930 static int acpi_power_meter_resume(struct device *dev) 931 { 932 struct acpi_power_meter_resource *resource; 933 934 if (!dev) 935 return -EINVAL; 936 937 resource = acpi_driver_data(to_acpi_device(dev)); 938 if (!resource) 939 return -EINVAL; 940 941 free_capabilities(resource); 942 read_capabilities(resource); 943 944 return 0; 945 } 946 947 static DEFINE_SIMPLE_DEV_PM_OPS(acpi_power_meter_pm, NULL, 948 acpi_power_meter_resume); 949 950 static struct acpi_driver acpi_power_meter_driver = { 951 .name = "power_meter", 952 .class = ACPI_POWER_METER_CLASS, 953 .ids = power_meter_ids, 954 .ops = { 955 .add = acpi_power_meter_add, 956 .remove = acpi_power_meter_remove, 957 .notify = acpi_power_meter_notify, 958 }, 959 .drv.pm = pm_sleep_ptr(&acpi_power_meter_pm), 960 }; 961 962 /* Module init/exit routines */ 963 static int __init enable_cap_knobs(const struct dmi_system_id *d) 964 { 965 cap_in_hardware = 1; 966 return 0; 967 } 968 969 static const struct dmi_system_id pm_dmi_table[] __initconst = { 970 { 971 enable_cap_knobs, "IBM Active Energy Manager", 972 { 973 DMI_MATCH(DMI_SYS_VENDOR, "IBM") 974 }, 975 }, 976 {} 977 }; 978 979 static int __init acpi_power_meter_init(void) 980 { 981 int result; 982 983 if (acpi_disabled) 984 return -ENODEV; 985 986 dmi_check_system(pm_dmi_table); 987 988 result = acpi_bus_register_driver(&acpi_power_meter_driver); 989 if (result < 0) 990 return result; 991 992 return 0; 993 } 994 995 static void __exit acpi_power_meter_exit(void) 996 { 997 acpi_bus_unregister_driver(&acpi_power_meter_driver); 998 } 999 1000 MODULE_AUTHOR("Darrick J. Wong <darrick.wong@oracle.com>"); 1001 MODULE_DESCRIPTION("ACPI 4.0 power meter driver"); 1002 MODULE_LICENSE("GPL"); 1003 1004 module_param(force_cap_on, bool, 0644); 1005 MODULE_PARM_DESC(force_cap_on, "Enable power cap even it is unsafe to do so."); 1006 1007 module_init(acpi_power_meter_init); 1008 module_exit(acpi_power_meter_exit); 1009