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 if (!obj) 534 continue; 535 536 sysfs_remove_link(resource->holders_dir, 537 kobject_name(&obj->dev.kobj)); 538 acpi_dev_put(obj); 539 } 540 541 kfree(resource->domain_devices); 542 kobject_put(resource->holders_dir); 543 resource->num_domain_devices = 0; 544 } 545 546 static int read_domain_devices(struct acpi_power_meter_resource *resource) 547 { 548 int res = 0; 549 int i; 550 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 551 union acpi_object *pss; 552 acpi_status status; 553 554 status = acpi_evaluate_object(resource->acpi_dev->handle, "_PMD", NULL, 555 &buffer); 556 if (ACPI_FAILURE(status)) { 557 acpi_evaluation_failure_warn(resource->acpi_dev->handle, "_PMD", 558 status); 559 return -ENODEV; 560 } 561 562 pss = buffer.pointer; 563 if (!pss || 564 pss->type != ACPI_TYPE_PACKAGE) { 565 dev_err(&resource->acpi_dev->dev, ACPI_POWER_METER_NAME 566 "Invalid _PMD data\n"); 567 res = -EFAULT; 568 goto end; 569 } 570 571 if (!pss->package.count) 572 goto end; 573 574 resource->domain_devices = kcalloc(pss->package.count, 575 sizeof(struct acpi_device *), 576 GFP_KERNEL); 577 if (!resource->domain_devices) { 578 res = -ENOMEM; 579 goto end; 580 } 581 582 resource->holders_dir = kobject_create_and_add("measures", 583 &resource->acpi_dev->dev.kobj); 584 if (!resource->holders_dir) { 585 res = -ENOMEM; 586 goto exit_free; 587 } 588 589 resource->num_domain_devices = pss->package.count; 590 591 for (i = 0; i < pss->package.count; i++) { 592 struct acpi_device *obj; 593 union acpi_object *element = &(pss->package.elements[i]); 594 595 /* Refuse non-references */ 596 if (element->type != ACPI_TYPE_LOCAL_REFERENCE) 597 continue; 598 599 /* Create a symlink to domain objects */ 600 obj = acpi_bus_get_acpi_device(element->reference.handle); 601 resource->domain_devices[i] = obj; 602 if (!obj) 603 continue; 604 605 res = sysfs_create_link(resource->holders_dir, &obj->dev.kobj, 606 kobject_name(&obj->dev.kobj)); 607 if (res) { 608 acpi_dev_put(obj); 609 resource->domain_devices[i] = NULL; 610 } 611 } 612 613 res = 0; 614 goto end; 615 616 exit_free: 617 kfree(resource->domain_devices); 618 end: 619 kfree(buffer.pointer); 620 return res; 621 } 622 623 /* Registration and deregistration */ 624 static int register_attrs(struct acpi_power_meter_resource *resource, 625 struct sensor_template *attrs) 626 { 627 struct device *dev = &resource->acpi_dev->dev; 628 struct sensor_device_attribute *sensors = 629 &resource->sensors[resource->num_sensors]; 630 int res = 0; 631 632 while (attrs->label) { 633 sensors->dev_attr.attr.name = attrs->label; 634 sensors->dev_attr.attr.mode = 0444; 635 sensors->dev_attr.show = attrs->show; 636 sensors->index = attrs->index; 637 638 if (attrs->set) { 639 sensors->dev_attr.attr.mode |= 0200; 640 sensors->dev_attr.store = attrs->set; 641 } 642 643 sysfs_attr_init(&sensors->dev_attr.attr); 644 res = device_create_file(dev, &sensors->dev_attr); 645 if (res) { 646 sensors->dev_attr.attr.name = NULL; 647 goto error; 648 } 649 sensors++; 650 resource->num_sensors++; 651 attrs++; 652 } 653 654 error: 655 return res; 656 } 657 658 static void remove_attrs(struct acpi_power_meter_resource *resource) 659 { 660 int i; 661 662 for (i = 0; i < resource->num_sensors; i++) { 663 if (!resource->sensors[i].dev_attr.attr.name) 664 continue; 665 device_remove_file(&resource->acpi_dev->dev, 666 &resource->sensors[i].dev_attr); 667 } 668 669 remove_domain_devices(resource); 670 671 resource->num_sensors = 0; 672 } 673 674 static int setup_attrs(struct acpi_power_meter_resource *resource) 675 { 676 int res = 0; 677 678 res = read_domain_devices(resource); 679 if (res) 680 return res; 681 682 if (resource->caps.flags & POWER_METER_CAN_MEASURE) { 683 res = register_attrs(resource, meter_attrs); 684 if (res) 685 goto error; 686 } 687 688 if (resource->caps.flags & POWER_METER_CAN_CAP) { 689 if (!can_cap_in_hardware()) { 690 dev_warn(&resource->acpi_dev->dev, 691 "Ignoring unsafe software power cap!\n"); 692 goto skip_unsafe_cap; 693 } 694 695 if (resource->caps.configurable_cap) 696 res = register_attrs(resource, rw_cap_attrs); 697 else 698 res = register_attrs(resource, ro_cap_attrs); 699 700 if (res) 701 goto error; 702 703 res = register_attrs(resource, misc_cap_attrs); 704 if (res) 705 goto error; 706 } 707 708 skip_unsafe_cap: 709 if (resource->caps.flags & POWER_METER_CAN_TRIP) { 710 res = register_attrs(resource, trip_attrs); 711 if (res) 712 goto error; 713 } 714 715 res = register_attrs(resource, misc_attrs); 716 if (res) 717 goto error; 718 719 return res; 720 error: 721 remove_attrs(resource); 722 return res; 723 } 724 725 static void free_capabilities(struct acpi_power_meter_resource *resource) 726 { 727 acpi_string *str; 728 int i; 729 730 str = &resource->model_number; 731 for (i = 0; i < 3; i++, str++) { 732 kfree(*str); 733 *str = NULL; 734 } 735 } 736 737 static int read_capabilities(struct acpi_power_meter_resource *resource) 738 { 739 int res = 0; 740 int i; 741 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 742 struct acpi_buffer state = { 0, NULL }; 743 struct acpi_buffer format = { sizeof("NNNNNNNNNNN"), "NNNNNNNNNNN" }; 744 union acpi_object *pss; 745 acpi_string *str; 746 acpi_status status; 747 748 status = acpi_evaluate_object(resource->acpi_dev->handle, "_PMC", NULL, 749 &buffer); 750 if (ACPI_FAILURE(status)) { 751 acpi_evaluation_failure_warn(resource->acpi_dev->handle, "_PMC", 752 status); 753 return -ENODEV; 754 } 755 756 pss = buffer.pointer; 757 if (!pss || 758 pss->type != ACPI_TYPE_PACKAGE || 759 pss->package.count != 14) { 760 dev_err(&resource->acpi_dev->dev, ACPI_POWER_METER_NAME 761 "Invalid _PMC data\n"); 762 res = -EFAULT; 763 goto end; 764 } 765 766 /* Grab all the integer data at once */ 767 state.length = sizeof(struct acpi_power_meter_capabilities); 768 state.pointer = &resource->caps; 769 770 status = acpi_extract_package(pss, &format, &state); 771 if (ACPI_FAILURE(status)) { 772 dev_err(&resource->acpi_dev->dev, ACPI_POWER_METER_NAME 773 "_PMC package parsing failed: %s\n", 774 acpi_format_exception(status)); 775 res = -EFAULT; 776 goto end; 777 } 778 779 if (resource->caps.units) { 780 dev_err(&resource->acpi_dev->dev, ACPI_POWER_METER_NAME 781 "Unknown units %llu.\n", 782 resource->caps.units); 783 res = -EINVAL; 784 goto end; 785 } 786 787 /* Grab the string data */ 788 str = &resource->model_number; 789 790 for (i = 11; i < 14; i++) { 791 union acpi_object *element = &(pss->package.elements[i]); 792 793 if (element->type != ACPI_TYPE_STRING) { 794 res = -EINVAL; 795 goto error; 796 } 797 798 *str = kcalloc(element->string.length + 1, sizeof(u8), 799 GFP_KERNEL); 800 if (!*str) { 801 res = -ENOMEM; 802 goto error; 803 } 804 805 strncpy(*str, element->string.pointer, element->string.length); 806 str++; 807 } 808 809 dev_info(&resource->acpi_dev->dev, "Found ACPI power meter.\n"); 810 goto end; 811 error: 812 free_capabilities(resource); 813 end: 814 kfree(buffer.pointer); 815 return res; 816 } 817 818 /* Handle ACPI event notifications */ 819 static void acpi_power_meter_notify(struct acpi_device *device, u32 event) 820 { 821 struct acpi_power_meter_resource *resource; 822 int res; 823 824 if (!device || !acpi_driver_data(device)) 825 return; 826 827 resource = acpi_driver_data(device); 828 829 switch (event) { 830 case METER_NOTIFY_CONFIG: 831 mutex_lock(&resource->lock); 832 free_capabilities(resource); 833 res = read_capabilities(resource); 834 mutex_unlock(&resource->lock); 835 if (res) 836 break; 837 838 remove_attrs(resource); 839 setup_attrs(resource); 840 break; 841 case METER_NOTIFY_TRIP: 842 sysfs_notify(&device->dev.kobj, NULL, POWER_AVERAGE_NAME); 843 break; 844 case METER_NOTIFY_CAP: 845 sysfs_notify(&device->dev.kobj, NULL, POWER_CAP_NAME); 846 break; 847 case METER_NOTIFY_INTERVAL: 848 sysfs_notify(&device->dev.kobj, NULL, POWER_AVG_INTERVAL_NAME); 849 break; 850 case METER_NOTIFY_CAPPING: 851 sysfs_notify(&device->dev.kobj, NULL, POWER_ALARM_NAME); 852 dev_info(&device->dev, "Capping in progress.\n"); 853 break; 854 default: 855 WARN(1, "Unexpected event %d\n", event); 856 break; 857 } 858 859 acpi_bus_generate_netlink_event(ACPI_POWER_METER_CLASS, 860 dev_name(&device->dev), event, 0); 861 } 862 863 static int acpi_power_meter_add(struct acpi_device *device) 864 { 865 int res; 866 struct acpi_power_meter_resource *resource; 867 868 if (!device) 869 return -EINVAL; 870 871 resource = kzalloc(sizeof(struct acpi_power_meter_resource), 872 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] = resource->trip[1] = -1; 888 889 res = setup_attrs(resource); 890 if (res) 891 goto exit_free_capability; 892 893 resource->hwmon_dev = hwmon_device_register(&device->dev); 894 if (IS_ERR(resource->hwmon_dev)) { 895 res = PTR_ERR(resource->hwmon_dev); 896 goto exit_remove; 897 } 898 899 res = 0; 900 goto exit; 901 902 exit_remove: 903 remove_attrs(resource); 904 exit_free_capability: 905 free_capabilities(resource); 906 exit_free: 907 kfree(resource); 908 exit: 909 return res; 910 } 911 912 static int acpi_power_meter_remove(struct acpi_device *device) 913 { 914 struct acpi_power_meter_resource *resource; 915 916 if (!device || !acpi_driver_data(device)) 917 return -EINVAL; 918 919 resource = acpi_driver_data(device); 920 hwmon_device_unregister(resource->hwmon_dev); 921 922 remove_attrs(resource); 923 free_capabilities(resource); 924 925 kfree(resource); 926 return 0; 927 } 928 929 #ifdef CONFIG_PM_SLEEP 930 931 static int acpi_power_meter_resume(struct device *dev) 932 { 933 struct acpi_power_meter_resource *resource; 934 935 if (!dev) 936 return -EINVAL; 937 938 resource = acpi_driver_data(to_acpi_device(dev)); 939 if (!resource) 940 return -EINVAL; 941 942 free_capabilities(resource); 943 read_capabilities(resource); 944 945 return 0; 946 } 947 948 #endif /* CONFIG_PM_SLEEP */ 949 950 static SIMPLE_DEV_PM_OPS(acpi_power_meter_pm, NULL, acpi_power_meter_resume); 951 952 static struct acpi_driver acpi_power_meter_driver = { 953 .name = "power_meter", 954 .class = ACPI_POWER_METER_CLASS, 955 .ids = power_meter_ids, 956 .ops = { 957 .add = acpi_power_meter_add, 958 .remove = acpi_power_meter_remove, 959 .notify = acpi_power_meter_notify, 960 }, 961 .drv.pm = &acpi_power_meter_pm, 962 }; 963 964 /* Module init/exit routines */ 965 static int __init enable_cap_knobs(const struct dmi_system_id *d) 966 { 967 cap_in_hardware = 1; 968 return 0; 969 } 970 971 static const struct dmi_system_id pm_dmi_table[] __initconst = { 972 { 973 enable_cap_knobs, "IBM Active Energy Manager", 974 { 975 DMI_MATCH(DMI_SYS_VENDOR, "IBM") 976 }, 977 }, 978 {} 979 }; 980 981 static int __init acpi_power_meter_init(void) 982 { 983 int result; 984 985 if (acpi_disabled) 986 return -ENODEV; 987 988 dmi_check_system(pm_dmi_table); 989 990 result = acpi_bus_register_driver(&acpi_power_meter_driver); 991 if (result < 0) 992 return result; 993 994 return 0; 995 } 996 997 static void __exit acpi_power_meter_exit(void) 998 { 999 acpi_bus_unregister_driver(&acpi_power_meter_driver); 1000 } 1001 1002 MODULE_AUTHOR("Darrick J. Wong <darrick.wong@oracle.com>"); 1003 MODULE_DESCRIPTION("ACPI 4.0 power meter driver"); 1004 MODULE_LICENSE("GPL"); 1005 1006 module_param(force_cap_on, bool, 0644); 1007 MODULE_PARM_DESC(force_cap_on, "Enable power cap even it is unsafe to do so."); 1008 1009 module_init(acpi_power_meter_init); 1010 module_exit(acpi_power_meter_exit); 1011