1 /* 2 * A hwmon driver for ACPI 4.0 power meters 3 * Copyright (C) 2009 IBM 4 * 5 * Author: Darrick J. Wong <darrick.wong@oracle.com> 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License as published by 9 * the Free Software Foundation; either version 2 of the License, or 10 * (at your option) any later version. 11 * 12 * This program is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 * GNU General Public License for more details. 16 * 17 * You should have received a copy of the GNU General Public License 18 * along with this program; if not, write to the Free Software 19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 20 */ 21 22 #include <linux/module.h> 23 #include <linux/hwmon.h> 24 #include <linux/hwmon-sysfs.h> 25 #include <linux/jiffies.h> 26 #include <linux/mutex.h> 27 #include <linux/dmi.h> 28 #include <linux/slab.h> 29 #include <linux/kdev_t.h> 30 #include <linux/sched.h> 31 #include <linux/time.h> 32 #include <linux/err.h> 33 #include <linux/acpi.h> 34 35 #define ACPI_POWER_METER_NAME "power_meter" 36 ACPI_MODULE_NAME(ACPI_POWER_METER_NAME); 37 #define ACPI_POWER_METER_DEVICE_NAME "Power Meter" 38 #define ACPI_POWER_METER_CLASS "pwr_meter_resource" 39 40 #define NUM_SENSORS 17 41 42 #define POWER_METER_CAN_MEASURE (1 << 0) 43 #define POWER_METER_CAN_TRIP (1 << 1) 44 #define POWER_METER_CAN_CAP (1 << 2) 45 #define POWER_METER_CAN_NOTIFY (1 << 3) 46 #define POWER_METER_IS_BATTERY (1 << 8) 47 #define UNKNOWN_HYSTERESIS 0xFFFFFFFF 48 49 #define METER_NOTIFY_CONFIG 0x80 50 #define METER_NOTIFY_TRIP 0x81 51 #define METER_NOTIFY_CAP 0x82 52 #define METER_NOTIFY_CAPPING 0x83 53 #define METER_NOTIFY_INTERVAL 0x84 54 55 #define POWER_AVERAGE_NAME "power1_average" 56 #define POWER_CAP_NAME "power1_cap" 57 #define POWER_AVG_INTERVAL_NAME "power1_average_interval" 58 #define POWER_ALARM_NAME "power1_alarm" 59 60 static int cap_in_hardware; 61 static bool force_cap_on; 62 63 static int can_cap_in_hardware(void) 64 { 65 return force_cap_on || cap_in_hardware; 66 } 67 68 static const struct acpi_device_id power_meter_ids[] = { 69 {"ACPI000D", 0}, 70 {"", 0}, 71 }; 72 MODULE_DEVICE_TABLE(acpi, power_meter_ids); 73 74 struct acpi_power_meter_capabilities { 75 u64 flags; 76 u64 units; 77 u64 type; 78 u64 accuracy; 79 u64 sampling_time; 80 u64 min_avg_interval; 81 u64 max_avg_interval; 82 u64 hysteresis; 83 u64 configurable_cap; 84 u64 min_cap; 85 u64 max_cap; 86 }; 87 88 struct acpi_power_meter_resource { 89 struct acpi_device *acpi_dev; 90 acpi_bus_id name; 91 struct mutex lock; 92 struct device *hwmon_dev; 93 struct acpi_power_meter_capabilities caps; 94 acpi_string model_number; 95 acpi_string serial_number; 96 acpi_string oem_info; 97 u64 power; 98 u64 cap; 99 u64 avg_interval; 100 int sensors_valid; 101 unsigned long sensors_last_updated; 102 struct sensor_device_attribute sensors[NUM_SENSORS]; 103 int num_sensors; 104 s64 trip[2]; 105 int num_domain_devices; 106 struct acpi_device **domain_devices; 107 struct kobject *holders_dir; 108 }; 109 110 struct sensor_template { 111 char *label; 112 ssize_t (*show)(struct device *dev, 113 struct device_attribute *devattr, 114 char *buf); 115 ssize_t (*set)(struct device *dev, 116 struct device_attribute *devattr, 117 const char *buf, size_t count); 118 int index; 119 }; 120 121 /* Averaging interval */ 122 static int update_avg_interval(struct acpi_power_meter_resource *resource) 123 { 124 unsigned long long data; 125 acpi_status status; 126 127 status = acpi_evaluate_integer(resource->acpi_dev->handle, "_GAI", 128 NULL, &data); 129 if (ACPI_FAILURE(status)) { 130 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _GAI")); 131 return -ENODEV; 132 } 133 134 resource->avg_interval = data; 135 return 0; 136 } 137 138 static ssize_t show_avg_interval(struct device *dev, 139 struct device_attribute *devattr, 140 char *buf) 141 { 142 struct acpi_device *acpi_dev = to_acpi_device(dev); 143 struct acpi_power_meter_resource *resource = acpi_dev->driver_data; 144 145 mutex_lock(&resource->lock); 146 update_avg_interval(resource); 147 mutex_unlock(&resource->lock); 148 149 return sprintf(buf, "%llu\n", resource->avg_interval); 150 } 151 152 static ssize_t set_avg_interval(struct device *dev, 153 struct device_attribute *devattr, 154 const char *buf, size_t count) 155 { 156 struct acpi_device *acpi_dev = to_acpi_device(dev); 157 struct acpi_power_meter_resource *resource = acpi_dev->driver_data; 158 union acpi_object arg0 = { ACPI_TYPE_INTEGER }; 159 struct acpi_object_list args = { 1, &arg0 }; 160 int res; 161 unsigned long temp; 162 unsigned long long data; 163 acpi_status status; 164 165 res = kstrtoul(buf, 10, &temp); 166 if (res) 167 return res; 168 169 if (temp > resource->caps.max_avg_interval || 170 temp < resource->caps.min_avg_interval) 171 return -EINVAL; 172 arg0.integer.value = temp; 173 174 mutex_lock(&resource->lock); 175 status = acpi_evaluate_integer(resource->acpi_dev->handle, "_PAI", 176 &args, &data); 177 if (!ACPI_FAILURE(status)) 178 resource->avg_interval = temp; 179 mutex_unlock(&resource->lock); 180 181 if (ACPI_FAILURE(status)) { 182 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PAI")); 183 return -EINVAL; 184 } 185 186 /* _PAI returns 0 on success, nonzero otherwise */ 187 if (data) 188 return -EINVAL; 189 190 return count; 191 } 192 193 /* Cap functions */ 194 static int update_cap(struct acpi_power_meter_resource *resource) 195 { 196 unsigned long long data; 197 acpi_status status; 198 199 status = acpi_evaluate_integer(resource->acpi_dev->handle, "_GHL", 200 NULL, &data); 201 if (ACPI_FAILURE(status)) { 202 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _GHL")); 203 return -ENODEV; 204 } 205 206 resource->cap = data; 207 return 0; 208 } 209 210 static ssize_t show_cap(struct device *dev, 211 struct device_attribute *devattr, 212 char *buf) 213 { 214 struct acpi_device *acpi_dev = to_acpi_device(dev); 215 struct acpi_power_meter_resource *resource = acpi_dev->driver_data; 216 217 mutex_lock(&resource->lock); 218 update_cap(resource); 219 mutex_unlock(&resource->lock); 220 221 return sprintf(buf, "%llu\n", resource->cap * 1000); 222 } 223 224 static ssize_t set_cap(struct device *dev, struct device_attribute *devattr, 225 const char *buf, size_t count) 226 { 227 struct acpi_device *acpi_dev = to_acpi_device(dev); 228 struct acpi_power_meter_resource *resource = acpi_dev->driver_data; 229 union acpi_object arg0 = { ACPI_TYPE_INTEGER }; 230 struct acpi_object_list args = { 1, &arg0 }; 231 int res; 232 unsigned long temp; 233 unsigned long long data; 234 acpi_status status; 235 236 res = kstrtoul(buf, 10, &temp); 237 if (res) 238 return res; 239 240 temp = DIV_ROUND_CLOSEST(temp, 1000); 241 if (temp > resource->caps.max_cap || temp < resource->caps.min_cap) 242 return -EINVAL; 243 arg0.integer.value = temp; 244 245 mutex_lock(&resource->lock); 246 status = acpi_evaluate_integer(resource->acpi_dev->handle, "_SHL", 247 &args, &data); 248 if (!ACPI_FAILURE(status)) 249 resource->cap = temp; 250 mutex_unlock(&resource->lock); 251 252 if (ACPI_FAILURE(status)) { 253 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _SHL")); 254 return -EINVAL; 255 } 256 257 /* _SHL returns 0 on success, nonzero otherwise */ 258 if (data) 259 return -EINVAL; 260 261 return count; 262 } 263 264 /* Power meter trip points */ 265 static int set_acpi_trip(struct acpi_power_meter_resource *resource) 266 { 267 union acpi_object arg_objs[] = { 268 {ACPI_TYPE_INTEGER}, 269 {ACPI_TYPE_INTEGER} 270 }; 271 struct acpi_object_list args = { 2, arg_objs }; 272 unsigned long long data; 273 acpi_status status; 274 275 /* Both trip levels must be set */ 276 if (resource->trip[0] < 0 || resource->trip[1] < 0) 277 return 0; 278 279 /* This driver stores min, max; ACPI wants max, min. */ 280 arg_objs[0].integer.value = resource->trip[1]; 281 arg_objs[1].integer.value = resource->trip[0]; 282 283 status = acpi_evaluate_integer(resource->acpi_dev->handle, "_PTP", 284 &args, &data); 285 if (ACPI_FAILURE(status)) { 286 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PTP")); 287 return -EINVAL; 288 } 289 290 /* _PTP returns 0 on success, nonzero otherwise */ 291 if (data) 292 return -EINVAL; 293 294 return 0; 295 } 296 297 static ssize_t set_trip(struct device *dev, struct device_attribute *devattr, 298 const char *buf, size_t count) 299 { 300 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 301 struct acpi_device *acpi_dev = to_acpi_device(dev); 302 struct acpi_power_meter_resource *resource = acpi_dev->driver_data; 303 int res; 304 unsigned long temp; 305 306 res = kstrtoul(buf, 10, &temp); 307 if (res) 308 return res; 309 310 temp = DIV_ROUND_CLOSEST(temp, 1000); 311 312 mutex_lock(&resource->lock); 313 resource->trip[attr->index - 7] = temp; 314 res = set_acpi_trip(resource); 315 mutex_unlock(&resource->lock); 316 317 if (res) 318 return res; 319 320 return count; 321 } 322 323 /* Power meter */ 324 static int update_meter(struct acpi_power_meter_resource *resource) 325 { 326 unsigned long long data; 327 acpi_status status; 328 unsigned long local_jiffies = jiffies; 329 330 if (time_before(local_jiffies, resource->sensors_last_updated + 331 msecs_to_jiffies(resource->caps.sampling_time)) && 332 resource->sensors_valid) 333 return 0; 334 335 status = acpi_evaluate_integer(resource->acpi_dev->handle, "_PMM", 336 NULL, &data); 337 if (ACPI_FAILURE(status)) { 338 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PMM")); 339 return -ENODEV; 340 } 341 342 resource->power = data; 343 resource->sensors_valid = 1; 344 resource->sensors_last_updated = jiffies; 345 return 0; 346 } 347 348 static ssize_t show_power(struct device *dev, 349 struct device_attribute *devattr, 350 char *buf) 351 { 352 struct acpi_device *acpi_dev = to_acpi_device(dev); 353 struct acpi_power_meter_resource *resource = acpi_dev->driver_data; 354 355 mutex_lock(&resource->lock); 356 update_meter(resource); 357 mutex_unlock(&resource->lock); 358 359 return sprintf(buf, "%llu\n", resource->power * 1000); 360 } 361 362 /* Miscellaneous */ 363 static ssize_t show_str(struct device *dev, 364 struct device_attribute *devattr, 365 char *buf) 366 { 367 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 368 struct acpi_device *acpi_dev = to_acpi_device(dev); 369 struct acpi_power_meter_resource *resource = acpi_dev->driver_data; 370 acpi_string val; 371 372 switch (attr->index) { 373 case 0: 374 val = resource->model_number; 375 break; 376 case 1: 377 val = resource->serial_number; 378 break; 379 case 2: 380 val = resource->oem_info; 381 break; 382 default: 383 WARN(1, "Implementation error: unexpected attribute index %d\n", 384 attr->index); 385 val = ""; 386 break; 387 } 388 389 return sprintf(buf, "%s\n", val); 390 } 391 392 static ssize_t show_val(struct device *dev, 393 struct device_attribute *devattr, 394 char *buf) 395 { 396 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 397 struct acpi_device *acpi_dev = to_acpi_device(dev); 398 struct acpi_power_meter_resource *resource = acpi_dev->driver_data; 399 u64 val = 0; 400 401 switch (attr->index) { 402 case 0: 403 val = resource->caps.min_avg_interval; 404 break; 405 case 1: 406 val = resource->caps.max_avg_interval; 407 break; 408 case 2: 409 val = resource->caps.min_cap * 1000; 410 break; 411 case 3: 412 val = resource->caps.max_cap * 1000; 413 break; 414 case 4: 415 if (resource->caps.hysteresis == UNKNOWN_HYSTERESIS) 416 return sprintf(buf, "unknown\n"); 417 418 val = resource->caps.hysteresis * 1000; 419 break; 420 case 5: 421 if (resource->caps.flags & POWER_METER_IS_BATTERY) 422 val = 1; 423 else 424 val = 0; 425 break; 426 case 6: 427 if (resource->power > resource->cap) 428 val = 1; 429 else 430 val = 0; 431 break; 432 case 7: 433 case 8: 434 if (resource->trip[attr->index - 7] < 0) 435 return sprintf(buf, "unknown\n"); 436 437 val = resource->trip[attr->index - 7] * 1000; 438 break; 439 default: 440 WARN(1, "Implementation error: unexpected attribute index %d\n", 441 attr->index); 442 break; 443 } 444 445 return sprintf(buf, "%llu\n", val); 446 } 447 448 static ssize_t show_accuracy(struct device *dev, 449 struct device_attribute *devattr, 450 char *buf) 451 { 452 struct acpi_device *acpi_dev = to_acpi_device(dev); 453 struct acpi_power_meter_resource *resource = acpi_dev->driver_data; 454 unsigned int acc = resource->caps.accuracy; 455 456 return sprintf(buf, "%u.%u%%\n", acc / 1000, acc % 1000); 457 } 458 459 static ssize_t show_name(struct device *dev, 460 struct device_attribute *devattr, 461 char *buf) 462 { 463 return sprintf(buf, "%s\n", ACPI_POWER_METER_NAME); 464 } 465 466 #define RO_SENSOR_TEMPLATE(_label, _show, _index) \ 467 { \ 468 .label = _label, \ 469 .show = _show, \ 470 .index = _index, \ 471 } 472 473 #define RW_SENSOR_TEMPLATE(_label, _show, _set, _index) \ 474 { \ 475 .label = _label, \ 476 .show = _show, \ 477 .set = _set, \ 478 .index = _index, \ 479 } 480 481 /* Sensor descriptions. If you add a sensor, update NUM_SENSORS above! */ 482 static struct sensor_template meter_attrs[] = { 483 RO_SENSOR_TEMPLATE(POWER_AVERAGE_NAME, show_power, 0), 484 RO_SENSOR_TEMPLATE("power1_accuracy", show_accuracy, 0), 485 RO_SENSOR_TEMPLATE("power1_average_interval_min", show_val, 0), 486 RO_SENSOR_TEMPLATE("power1_average_interval_max", show_val, 1), 487 RO_SENSOR_TEMPLATE("power1_is_battery", show_val, 5), 488 RW_SENSOR_TEMPLATE(POWER_AVG_INTERVAL_NAME, show_avg_interval, 489 set_avg_interval, 0), 490 {}, 491 }; 492 493 static struct sensor_template misc_cap_attrs[] = { 494 RO_SENSOR_TEMPLATE("power1_cap_min", show_val, 2), 495 RO_SENSOR_TEMPLATE("power1_cap_max", show_val, 3), 496 RO_SENSOR_TEMPLATE("power1_cap_hyst", show_val, 4), 497 RO_SENSOR_TEMPLATE(POWER_ALARM_NAME, show_val, 6), 498 {}, 499 }; 500 501 static struct sensor_template ro_cap_attrs[] = { 502 RO_SENSOR_TEMPLATE(POWER_CAP_NAME, show_cap, 0), 503 {}, 504 }; 505 506 static struct sensor_template rw_cap_attrs[] = { 507 RW_SENSOR_TEMPLATE(POWER_CAP_NAME, show_cap, set_cap, 0), 508 {}, 509 }; 510 511 static struct sensor_template trip_attrs[] = { 512 RW_SENSOR_TEMPLATE("power1_average_min", show_val, set_trip, 7), 513 RW_SENSOR_TEMPLATE("power1_average_max", show_val, set_trip, 8), 514 {}, 515 }; 516 517 static struct sensor_template misc_attrs[] = { 518 RO_SENSOR_TEMPLATE("name", show_name, 0), 519 RO_SENSOR_TEMPLATE("power1_model_number", show_str, 0), 520 RO_SENSOR_TEMPLATE("power1_oem_info", show_str, 2), 521 RO_SENSOR_TEMPLATE("power1_serial_number", show_str, 1), 522 {}, 523 }; 524 525 #undef RO_SENSOR_TEMPLATE 526 #undef RW_SENSOR_TEMPLATE 527 528 /* Read power domain data */ 529 static void remove_domain_devices(struct acpi_power_meter_resource *resource) 530 { 531 int i; 532 533 if (!resource->num_domain_devices) 534 return; 535 536 for (i = 0; i < resource->num_domain_devices; i++) { 537 struct acpi_device *obj = resource->domain_devices[i]; 538 if (!obj) 539 continue; 540 541 sysfs_remove_link(resource->holders_dir, 542 kobject_name(&obj->dev.kobj)); 543 put_device(&obj->dev); 544 } 545 546 kfree(resource->domain_devices); 547 kobject_put(resource->holders_dir); 548 resource->num_domain_devices = 0; 549 } 550 551 static int read_domain_devices(struct acpi_power_meter_resource *resource) 552 { 553 int res = 0; 554 int i; 555 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 556 union acpi_object *pss; 557 acpi_status status; 558 559 status = acpi_evaluate_object(resource->acpi_dev->handle, "_PMD", NULL, 560 &buffer); 561 if (ACPI_FAILURE(status)) { 562 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PMD")); 563 return -ENODEV; 564 } 565 566 pss = buffer.pointer; 567 if (!pss || 568 pss->type != ACPI_TYPE_PACKAGE) { 569 dev_err(&resource->acpi_dev->dev, ACPI_POWER_METER_NAME 570 "Invalid _PMD data\n"); 571 res = -EFAULT; 572 goto end; 573 } 574 575 if (!pss->package.count) 576 goto end; 577 578 resource->domain_devices = kcalloc(pss->package.count, 579 sizeof(struct acpi_device *), 580 GFP_KERNEL); 581 if (!resource->domain_devices) { 582 res = -ENOMEM; 583 goto end; 584 } 585 586 resource->holders_dir = kobject_create_and_add("measures", 587 &resource->acpi_dev->dev.kobj); 588 if (!resource->holders_dir) { 589 res = -ENOMEM; 590 goto exit_free; 591 } 592 593 resource->num_domain_devices = pss->package.count; 594 595 for (i = 0; i < pss->package.count; i++) { 596 struct acpi_device *obj; 597 union acpi_object *element = &(pss->package.elements[i]); 598 599 /* Refuse non-references */ 600 if (element->type != ACPI_TYPE_LOCAL_REFERENCE) 601 continue; 602 603 /* Create a symlink to domain objects */ 604 resource->domain_devices[i] = NULL; 605 if (acpi_bus_get_device(element->reference.handle, 606 &resource->domain_devices[i])) 607 continue; 608 609 obj = resource->domain_devices[i]; 610 get_device(&obj->dev); 611 612 res = sysfs_create_link(resource->holders_dir, &obj->dev.kobj, 613 kobject_name(&obj->dev.kobj)); 614 if (res) { 615 put_device(&obj->dev); 616 resource->domain_devices[i] = NULL; 617 } 618 } 619 620 res = 0; 621 goto end; 622 623 exit_free: 624 kfree(resource->domain_devices); 625 end: 626 kfree(buffer.pointer); 627 return res; 628 } 629 630 /* Registration and deregistration */ 631 static int register_attrs(struct acpi_power_meter_resource *resource, 632 struct sensor_template *attrs) 633 { 634 struct device *dev = &resource->acpi_dev->dev; 635 struct sensor_device_attribute *sensors = 636 &resource->sensors[resource->num_sensors]; 637 int res = 0; 638 639 while (attrs->label) { 640 sensors->dev_attr.attr.name = attrs->label; 641 sensors->dev_attr.attr.mode = S_IRUGO; 642 sensors->dev_attr.show = attrs->show; 643 sensors->index = attrs->index; 644 645 if (attrs->set) { 646 sensors->dev_attr.attr.mode |= S_IWUSR; 647 sensors->dev_attr.store = attrs->set; 648 } 649 650 sysfs_attr_init(&sensors->dev_attr.attr); 651 res = device_create_file(dev, &sensors->dev_attr); 652 if (res) { 653 sensors->dev_attr.attr.name = NULL; 654 goto error; 655 } 656 sensors++; 657 resource->num_sensors++; 658 attrs++; 659 } 660 661 error: 662 return res; 663 } 664 665 static void remove_attrs(struct acpi_power_meter_resource *resource) 666 { 667 int i; 668 669 for (i = 0; i < resource->num_sensors; i++) { 670 if (!resource->sensors[i].dev_attr.attr.name) 671 continue; 672 device_remove_file(&resource->acpi_dev->dev, 673 &resource->sensors[i].dev_attr); 674 } 675 676 remove_domain_devices(resource); 677 678 resource->num_sensors = 0; 679 } 680 681 static int setup_attrs(struct acpi_power_meter_resource *resource) 682 { 683 int res = 0; 684 685 res = read_domain_devices(resource); 686 if (res) 687 return res; 688 689 if (resource->caps.flags & POWER_METER_CAN_MEASURE) { 690 res = register_attrs(resource, meter_attrs); 691 if (res) 692 goto error; 693 } 694 695 if (resource->caps.flags & POWER_METER_CAN_CAP) { 696 if (!can_cap_in_hardware()) { 697 dev_err(&resource->acpi_dev->dev, 698 "Ignoring unsafe software power cap!\n"); 699 goto skip_unsafe_cap; 700 } 701 702 if (resource->caps.configurable_cap) 703 res = register_attrs(resource, rw_cap_attrs); 704 else 705 res = register_attrs(resource, ro_cap_attrs); 706 707 if (res) 708 goto error; 709 710 res = register_attrs(resource, misc_cap_attrs); 711 if (res) 712 goto error; 713 } 714 715 skip_unsafe_cap: 716 if (resource->caps.flags & POWER_METER_CAN_TRIP) { 717 res = register_attrs(resource, trip_attrs); 718 if (res) 719 goto error; 720 } 721 722 res = register_attrs(resource, misc_attrs); 723 if (res) 724 goto error; 725 726 return res; 727 error: 728 remove_attrs(resource); 729 return res; 730 } 731 732 static void free_capabilities(struct acpi_power_meter_resource *resource) 733 { 734 acpi_string *str; 735 int i; 736 737 str = &resource->model_number; 738 for (i = 0; i < 3; i++, str++) 739 kfree(*str); 740 } 741 742 static int read_capabilities(struct acpi_power_meter_resource *resource) 743 { 744 int res = 0; 745 int i; 746 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 747 struct acpi_buffer state = { 0, NULL }; 748 struct acpi_buffer format = { sizeof("NNNNNNNNNNN"), "NNNNNNNNNNN" }; 749 union acpi_object *pss; 750 acpi_string *str; 751 acpi_status status; 752 753 status = acpi_evaluate_object(resource->acpi_dev->handle, "_PMC", NULL, 754 &buffer); 755 if (ACPI_FAILURE(status)) { 756 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PMC")); 757 return -ENODEV; 758 } 759 760 pss = buffer.pointer; 761 if (!pss || 762 pss->type != ACPI_TYPE_PACKAGE || 763 pss->package.count != 14) { 764 dev_err(&resource->acpi_dev->dev, ACPI_POWER_METER_NAME 765 "Invalid _PMC data\n"); 766 res = -EFAULT; 767 goto end; 768 } 769 770 /* Grab all the integer data at once */ 771 state.length = sizeof(struct acpi_power_meter_capabilities); 772 state.pointer = &resource->caps; 773 774 status = acpi_extract_package(pss, &format, &state); 775 if (ACPI_FAILURE(status)) { 776 ACPI_EXCEPTION((AE_INFO, status, "Invalid data")); 777 res = -EFAULT; 778 goto end; 779 } 780 781 if (resource->caps.units) { 782 dev_err(&resource->acpi_dev->dev, ACPI_POWER_METER_NAME 783 "Unknown units %llu.\n", 784 resource->caps.units); 785 res = -EINVAL; 786 goto end; 787 } 788 789 /* Grab the string data */ 790 str = &resource->model_number; 791 792 for (i = 11; i < 14; i++) { 793 union acpi_object *element = &(pss->package.elements[i]); 794 795 if (element->type != ACPI_TYPE_STRING) { 796 res = -EINVAL; 797 goto error; 798 } 799 800 *str = kcalloc(element->string.length + 1, sizeof(u8), 801 GFP_KERNEL); 802 if (!*str) { 803 res = -ENOMEM; 804 goto error; 805 } 806 807 strncpy(*str, element->string.pointer, element->string.length); 808 str++; 809 } 810 811 dev_info(&resource->acpi_dev->dev, "Found ACPI power meter.\n"); 812 goto end; 813 error: 814 str = &resource->model_number; 815 for (i = 0; i < 3; i++, str++) 816 kfree(*str); 817 end: 818 kfree(buffer.pointer); 819 return res; 820 } 821 822 /* Handle ACPI event notifications */ 823 static void acpi_power_meter_notify(struct acpi_device *device, u32 event) 824 { 825 struct acpi_power_meter_resource *resource; 826 int res; 827 828 if (!device || !acpi_driver_data(device)) 829 return; 830 831 resource = acpi_driver_data(device); 832 833 mutex_lock(&resource->lock); 834 switch (event) { 835 case METER_NOTIFY_CONFIG: 836 free_capabilities(resource); 837 res = read_capabilities(resource); 838 if (res) 839 break; 840 841 remove_attrs(resource); 842 setup_attrs(resource); 843 break; 844 case METER_NOTIFY_TRIP: 845 sysfs_notify(&device->dev.kobj, NULL, POWER_AVERAGE_NAME); 846 update_meter(resource); 847 break; 848 case METER_NOTIFY_CAP: 849 sysfs_notify(&device->dev.kobj, NULL, POWER_CAP_NAME); 850 update_cap(resource); 851 break; 852 case METER_NOTIFY_INTERVAL: 853 sysfs_notify(&device->dev.kobj, NULL, POWER_AVG_INTERVAL_NAME); 854 update_avg_interval(resource); 855 break; 856 case METER_NOTIFY_CAPPING: 857 sysfs_notify(&device->dev.kobj, NULL, POWER_ALARM_NAME); 858 dev_info(&device->dev, "Capping in progress.\n"); 859 break; 860 default: 861 WARN(1, "Unexpected event %d\n", event); 862 break; 863 } 864 mutex_unlock(&resource->lock); 865 866 acpi_bus_generate_netlink_event(ACPI_POWER_METER_CLASS, 867 dev_name(&device->dev), event, 0); 868 } 869 870 static int acpi_power_meter_add(struct acpi_device *device) 871 { 872 int res; 873 struct acpi_power_meter_resource *resource; 874 875 if (!device) 876 return -EINVAL; 877 878 resource = kzalloc(sizeof(struct acpi_power_meter_resource), 879 GFP_KERNEL); 880 if (!resource) 881 return -ENOMEM; 882 883 resource->sensors_valid = 0; 884 resource->acpi_dev = device; 885 mutex_init(&resource->lock); 886 strcpy(acpi_device_name(device), ACPI_POWER_METER_DEVICE_NAME); 887 strcpy(acpi_device_class(device), ACPI_POWER_METER_CLASS); 888 device->driver_data = resource; 889 890 free_capabilities(resource); 891 res = read_capabilities(resource); 892 if (res) 893 goto exit_free; 894 895 resource->trip[0] = resource->trip[1] = -1; 896 897 res = setup_attrs(resource); 898 if (res) 899 goto exit_free; 900 901 resource->hwmon_dev = hwmon_device_register(&device->dev); 902 if (IS_ERR(resource->hwmon_dev)) { 903 res = PTR_ERR(resource->hwmon_dev); 904 goto exit_remove; 905 } 906 907 res = 0; 908 goto exit; 909 910 exit_remove: 911 remove_attrs(resource); 912 exit_free: 913 kfree(resource); 914 exit: 915 return res; 916 } 917 918 static int acpi_power_meter_remove(struct acpi_device *device) 919 { 920 struct acpi_power_meter_resource *resource; 921 922 if (!device || !acpi_driver_data(device)) 923 return -EINVAL; 924 925 resource = acpi_driver_data(device); 926 hwmon_device_unregister(resource->hwmon_dev); 927 928 free_capabilities(resource); 929 remove_attrs(resource); 930 931 kfree(resource); 932 return 0; 933 } 934 935 #ifdef CONFIG_PM_SLEEP 936 937 static int acpi_power_meter_resume(struct device *dev) 938 { 939 struct acpi_power_meter_resource *resource; 940 941 if (!dev) 942 return -EINVAL; 943 944 resource = acpi_driver_data(to_acpi_device(dev)); 945 if (!resource) 946 return -EINVAL; 947 948 free_capabilities(resource); 949 read_capabilities(resource); 950 951 return 0; 952 } 953 954 #endif /* CONFIG_PM_SLEEP */ 955 956 static SIMPLE_DEV_PM_OPS(acpi_power_meter_pm, NULL, acpi_power_meter_resume); 957 958 static struct acpi_driver acpi_power_meter_driver = { 959 .name = "power_meter", 960 .class = ACPI_POWER_METER_CLASS, 961 .ids = power_meter_ids, 962 .ops = { 963 .add = acpi_power_meter_add, 964 .remove = acpi_power_meter_remove, 965 .notify = acpi_power_meter_notify, 966 }, 967 .drv.pm = &acpi_power_meter_pm, 968 }; 969 970 /* Module init/exit routines */ 971 static int __init enable_cap_knobs(const struct dmi_system_id *d) 972 { 973 cap_in_hardware = 1; 974 return 0; 975 } 976 977 static const struct dmi_system_id pm_dmi_table[] __initconst = { 978 { 979 enable_cap_knobs, "IBM Active Energy Manager", 980 { 981 DMI_MATCH(DMI_SYS_VENDOR, "IBM") 982 }, 983 }, 984 {} 985 }; 986 987 static int __init acpi_power_meter_init(void) 988 { 989 int result; 990 991 if (acpi_disabled) 992 return -ENODEV; 993 994 dmi_check_system(pm_dmi_table); 995 996 result = acpi_bus_register_driver(&acpi_power_meter_driver); 997 if (result < 0) 998 return result; 999 1000 return 0; 1001 } 1002 1003 static void __exit acpi_power_meter_exit(void) 1004 { 1005 acpi_bus_unregister_driver(&acpi_power_meter_driver); 1006 } 1007 1008 MODULE_AUTHOR("Darrick J. Wong <darrick.wong@oracle.com>"); 1009 MODULE_DESCRIPTION("ACPI 4.0 power meter driver"); 1010 MODULE_LICENSE("GPL"); 1011 1012 module_param(force_cap_on, bool, 0644); 1013 MODULE_PARM_DESC(force_cap_on, "Enable power cap even it is unsafe to do so."); 1014 1015 module_init(acpi_power_meter_init); 1016 module_exit(acpi_power_meter_exit); 1017