1 /* 2 * A hwmon driver for ACPI 4.0 power meters 3 * Copyright (C) 2009 IBM 4 * 5 * Author: Darrick J. Wong <djwong@us.ibm.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 <acpi/acpi_drivers.h> 33 #include <acpi/acpi_bus.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 int trip[2]; 105 int num_domain_devices; 106 struct acpi_device **domain_devices; 107 struct kobject *holders_dir; 108 }; 109 110 struct ro_sensor_template { 111 char *label; 112 ssize_t (*show)(struct device *dev, 113 struct device_attribute *devattr, 114 char *buf); 115 int index; 116 }; 117 118 struct rw_sensor_template { 119 char *label; 120 ssize_t (*show)(struct device *dev, 121 struct device_attribute *devattr, 122 char *buf); 123 ssize_t (*set)(struct device *dev, 124 struct device_attribute *devattr, 125 const char *buf, size_t count); 126 int index; 127 }; 128 129 /* Averaging interval */ 130 static int update_avg_interval(struct acpi_power_meter_resource *resource) 131 { 132 unsigned long long data; 133 acpi_status status; 134 135 status = acpi_evaluate_integer(resource->acpi_dev->handle, "_GAI", 136 NULL, &data); 137 if (ACPI_FAILURE(status)) { 138 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _GAI")); 139 return -ENODEV; 140 } 141 142 resource->avg_interval = data; 143 return 0; 144 } 145 146 static ssize_t show_avg_interval(struct device *dev, 147 struct device_attribute *devattr, 148 char *buf) 149 { 150 struct acpi_device *acpi_dev = to_acpi_device(dev); 151 struct acpi_power_meter_resource *resource = acpi_dev->driver_data; 152 153 mutex_lock(&resource->lock); 154 update_avg_interval(resource); 155 mutex_unlock(&resource->lock); 156 157 return sprintf(buf, "%llu\n", resource->avg_interval); 158 } 159 160 static ssize_t set_avg_interval(struct device *dev, 161 struct device_attribute *devattr, 162 const char *buf, size_t count) 163 { 164 struct acpi_device *acpi_dev = to_acpi_device(dev); 165 struct acpi_power_meter_resource *resource = acpi_dev->driver_data; 166 union acpi_object arg0 = { ACPI_TYPE_INTEGER }; 167 struct acpi_object_list args = { 1, &arg0 }; 168 int res; 169 unsigned long temp; 170 unsigned long long data; 171 acpi_status status; 172 173 res = kstrtoul(buf, 10, &temp); 174 if (res) 175 return res; 176 177 if (temp > resource->caps.max_avg_interval || 178 temp < resource->caps.min_avg_interval) 179 return -EINVAL; 180 arg0.integer.value = temp; 181 182 mutex_lock(&resource->lock); 183 status = acpi_evaluate_integer(resource->acpi_dev->handle, "_PAI", 184 &args, &data); 185 if (!ACPI_FAILURE(status)) 186 resource->avg_interval = temp; 187 mutex_unlock(&resource->lock); 188 189 if (ACPI_FAILURE(status)) { 190 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PAI")); 191 return -EINVAL; 192 } 193 194 /* _PAI returns 0 on success, nonzero otherwise */ 195 if (data) 196 return -EINVAL; 197 198 return count; 199 } 200 201 /* Cap functions */ 202 static int update_cap(struct acpi_power_meter_resource *resource) 203 { 204 unsigned long long data; 205 acpi_status status; 206 207 status = acpi_evaluate_integer(resource->acpi_dev->handle, "_GHL", 208 NULL, &data); 209 if (ACPI_FAILURE(status)) { 210 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _GHL")); 211 return -ENODEV; 212 } 213 214 resource->cap = data; 215 return 0; 216 } 217 218 static ssize_t show_cap(struct device *dev, 219 struct device_attribute *devattr, 220 char *buf) 221 { 222 struct acpi_device *acpi_dev = to_acpi_device(dev); 223 struct acpi_power_meter_resource *resource = acpi_dev->driver_data; 224 225 mutex_lock(&resource->lock); 226 update_cap(resource); 227 mutex_unlock(&resource->lock); 228 229 return sprintf(buf, "%llu\n", resource->cap * 1000); 230 } 231 232 static ssize_t set_cap(struct device *dev, struct device_attribute *devattr, 233 const char *buf, size_t count) 234 { 235 struct acpi_device *acpi_dev = to_acpi_device(dev); 236 struct acpi_power_meter_resource *resource = acpi_dev->driver_data; 237 union acpi_object arg0 = { ACPI_TYPE_INTEGER }; 238 struct acpi_object_list args = { 1, &arg0 }; 239 int res; 240 unsigned long temp; 241 unsigned long long data; 242 acpi_status status; 243 244 res = kstrtoul(buf, 10, &temp); 245 if (res) 246 return res; 247 248 temp /= 1000; 249 if (temp > resource->caps.max_cap || temp < resource->caps.min_cap) 250 return -EINVAL; 251 arg0.integer.value = temp; 252 253 mutex_lock(&resource->lock); 254 status = acpi_evaluate_integer(resource->acpi_dev->handle, "_SHL", 255 &args, &data); 256 if (!ACPI_FAILURE(status)) 257 resource->cap = temp; 258 mutex_unlock(&resource->lock); 259 260 if (ACPI_FAILURE(status)) { 261 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _SHL")); 262 return -EINVAL; 263 } 264 265 /* _SHL returns 0 on success, nonzero otherwise */ 266 if (data) 267 return -EINVAL; 268 269 return count; 270 } 271 272 /* Power meter trip points */ 273 static int set_acpi_trip(struct acpi_power_meter_resource *resource) 274 { 275 union acpi_object arg_objs[] = { 276 {ACPI_TYPE_INTEGER}, 277 {ACPI_TYPE_INTEGER} 278 }; 279 struct acpi_object_list args = { 2, arg_objs }; 280 unsigned long long data; 281 acpi_status status; 282 283 /* Both trip levels must be set */ 284 if (resource->trip[0] < 0 || resource->trip[1] < 0) 285 return 0; 286 287 /* This driver stores min, max; ACPI wants max, min. */ 288 arg_objs[0].integer.value = resource->trip[1]; 289 arg_objs[1].integer.value = resource->trip[0]; 290 291 status = acpi_evaluate_integer(resource->acpi_dev->handle, "_PTP", 292 &args, &data); 293 if (ACPI_FAILURE(status)) { 294 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PTP")); 295 return -EINVAL; 296 } 297 298 /* _PTP returns 0 on success, nonzero otherwise */ 299 if (data) 300 return -EINVAL; 301 302 return 0; 303 } 304 305 static ssize_t set_trip(struct device *dev, struct device_attribute *devattr, 306 const char *buf, size_t count) 307 { 308 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 309 struct acpi_device *acpi_dev = to_acpi_device(dev); 310 struct acpi_power_meter_resource *resource = acpi_dev->driver_data; 311 int res; 312 unsigned long temp; 313 314 res = kstrtoul(buf, 10, &temp); 315 if (res) 316 return res; 317 318 temp /= 1000; 319 if (temp < 0) 320 return -EINVAL; 321 322 mutex_lock(&resource->lock); 323 resource->trip[attr->index - 7] = temp; 324 res = set_acpi_trip(resource); 325 mutex_unlock(&resource->lock); 326 327 if (res) 328 return res; 329 330 return count; 331 } 332 333 /* Power meter */ 334 static int update_meter(struct acpi_power_meter_resource *resource) 335 { 336 unsigned long long data; 337 acpi_status status; 338 unsigned long local_jiffies = jiffies; 339 340 if (time_before(local_jiffies, resource->sensors_last_updated + 341 msecs_to_jiffies(resource->caps.sampling_time)) && 342 resource->sensors_valid) 343 return 0; 344 345 status = acpi_evaluate_integer(resource->acpi_dev->handle, "_PMM", 346 NULL, &data); 347 if (ACPI_FAILURE(status)) { 348 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PMM")); 349 return -ENODEV; 350 } 351 352 resource->power = data; 353 resource->sensors_valid = 1; 354 resource->sensors_last_updated = jiffies; 355 return 0; 356 } 357 358 static ssize_t show_power(struct device *dev, 359 struct device_attribute *devattr, 360 char *buf) 361 { 362 struct acpi_device *acpi_dev = to_acpi_device(dev); 363 struct acpi_power_meter_resource *resource = acpi_dev->driver_data; 364 365 mutex_lock(&resource->lock); 366 update_meter(resource); 367 mutex_unlock(&resource->lock); 368 369 return sprintf(buf, "%llu\n", resource->power * 1000); 370 } 371 372 /* Miscellaneous */ 373 static ssize_t show_str(struct device *dev, 374 struct device_attribute *devattr, 375 char *buf) 376 { 377 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 378 struct acpi_device *acpi_dev = to_acpi_device(dev); 379 struct acpi_power_meter_resource *resource = acpi_dev->driver_data; 380 acpi_string val; 381 382 switch (attr->index) { 383 case 0: 384 val = resource->model_number; 385 break; 386 case 1: 387 val = resource->serial_number; 388 break; 389 case 2: 390 val = resource->oem_info; 391 break; 392 default: 393 BUG(); 394 } 395 396 return sprintf(buf, "%s\n", val); 397 } 398 399 static ssize_t show_val(struct device *dev, 400 struct device_attribute *devattr, 401 char *buf) 402 { 403 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 404 struct acpi_device *acpi_dev = to_acpi_device(dev); 405 struct acpi_power_meter_resource *resource = acpi_dev->driver_data; 406 u64 val = 0; 407 408 switch (attr->index) { 409 case 0: 410 val = resource->caps.min_avg_interval; 411 break; 412 case 1: 413 val = resource->caps.max_avg_interval; 414 break; 415 case 2: 416 val = resource->caps.min_cap * 1000; 417 break; 418 case 3: 419 val = resource->caps.max_cap * 1000; 420 break; 421 case 4: 422 if (resource->caps.hysteresis == UNKNOWN_HYSTERESIS) 423 return sprintf(buf, "unknown\n"); 424 425 val = resource->caps.hysteresis * 1000; 426 break; 427 case 5: 428 if (resource->caps.flags & POWER_METER_IS_BATTERY) 429 val = 1; 430 else 431 val = 0; 432 break; 433 case 6: 434 if (resource->power > resource->cap) 435 val = 1; 436 else 437 val = 0; 438 break; 439 case 7: 440 case 8: 441 if (resource->trip[attr->index - 7] < 0) 442 return sprintf(buf, "unknown\n"); 443 444 val = resource->trip[attr->index - 7] * 1000; 445 break; 446 default: 447 BUG(); 448 } 449 450 return sprintf(buf, "%llu\n", val); 451 } 452 453 static ssize_t show_accuracy(struct device *dev, 454 struct device_attribute *devattr, 455 char *buf) 456 { 457 struct acpi_device *acpi_dev = to_acpi_device(dev); 458 struct acpi_power_meter_resource *resource = acpi_dev->driver_data; 459 unsigned int acc = resource->caps.accuracy; 460 461 return sprintf(buf, "%u.%u%%\n", acc / 1000, acc % 1000); 462 } 463 464 static ssize_t show_name(struct device *dev, 465 struct device_attribute *devattr, 466 char *buf) 467 { 468 return sprintf(buf, "%s\n", ACPI_POWER_METER_NAME); 469 } 470 471 /* Sensor descriptions. If you add a sensor, update NUM_SENSORS above! */ 472 static struct ro_sensor_template meter_ro_attrs[] = { 473 {POWER_AVERAGE_NAME, show_power, 0}, 474 {"power1_accuracy", show_accuracy, 0}, 475 {"power1_average_interval_min", show_val, 0}, 476 {"power1_average_interval_max", show_val, 1}, 477 {"power1_is_battery", show_val, 5}, 478 {NULL, NULL, 0}, 479 }; 480 481 static struct rw_sensor_template meter_rw_attrs[] = { 482 {POWER_AVG_INTERVAL_NAME, show_avg_interval, set_avg_interval, 0}, 483 {NULL, NULL, NULL, 0}, 484 }; 485 486 static struct ro_sensor_template misc_cap_attrs[] = { 487 {"power1_cap_min", show_val, 2}, 488 {"power1_cap_max", show_val, 3}, 489 {"power1_cap_hyst", show_val, 4}, 490 {POWER_ALARM_NAME, show_val, 6}, 491 {NULL, NULL, 0}, 492 }; 493 494 static struct ro_sensor_template ro_cap_attrs[] = { 495 {POWER_CAP_NAME, show_cap, 0}, 496 {NULL, NULL, 0}, 497 }; 498 499 static struct rw_sensor_template rw_cap_attrs[] = { 500 {POWER_CAP_NAME, show_cap, set_cap, 0}, 501 {NULL, NULL, NULL, 0}, 502 }; 503 504 static struct rw_sensor_template trip_attrs[] = { 505 {"power1_average_min", show_val, set_trip, 7}, 506 {"power1_average_max", show_val, set_trip, 8}, 507 {NULL, NULL, NULL, 0}, 508 }; 509 510 static struct ro_sensor_template misc_attrs[] = { 511 {"name", show_name, 0}, 512 {"power1_model_number", show_str, 0}, 513 {"power1_oem_info", show_str, 2}, 514 {"power1_serial_number", show_str, 1}, 515 {NULL, NULL, 0}, 516 }; 517 518 /* Read power domain data */ 519 static void remove_domain_devices(struct acpi_power_meter_resource *resource) 520 { 521 int i; 522 523 if (!resource->num_domain_devices) 524 return; 525 526 for (i = 0; i < resource->num_domain_devices; i++) { 527 struct acpi_device *obj = resource->domain_devices[i]; 528 if (!obj) 529 continue; 530 531 sysfs_remove_link(resource->holders_dir, 532 kobject_name(&obj->dev.kobj)); 533 put_device(&obj->dev); 534 } 535 536 kfree(resource->domain_devices); 537 kobject_put(resource->holders_dir); 538 resource->num_domain_devices = 0; 539 } 540 541 static int read_domain_devices(struct acpi_power_meter_resource *resource) 542 { 543 int res = 0; 544 int i; 545 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 546 union acpi_object *pss; 547 acpi_status status; 548 549 status = acpi_evaluate_object(resource->acpi_dev->handle, "_PMD", NULL, 550 &buffer); 551 if (ACPI_FAILURE(status)) { 552 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PMD")); 553 return -ENODEV; 554 } 555 556 pss = buffer.pointer; 557 if (!pss || 558 pss->type != ACPI_TYPE_PACKAGE) { 559 dev_err(&resource->acpi_dev->dev, ACPI_POWER_METER_NAME 560 "Invalid _PMD data\n"); 561 res = -EFAULT; 562 goto end; 563 } 564 565 if (!pss->package.count) 566 goto end; 567 568 resource->domain_devices = kzalloc(sizeof(struct acpi_device *) * 569 pss->package.count, GFP_KERNEL); 570 if (!resource->domain_devices) { 571 res = -ENOMEM; 572 goto end; 573 } 574 575 resource->holders_dir = kobject_create_and_add("measures", 576 &resource->acpi_dev->dev.kobj); 577 if (!resource->holders_dir) { 578 res = -ENOMEM; 579 goto exit_free; 580 } 581 582 resource->num_domain_devices = pss->package.count; 583 584 for (i = 0; i < pss->package.count; i++) { 585 struct acpi_device *obj; 586 union acpi_object *element = &(pss->package.elements[i]); 587 588 /* Refuse non-references */ 589 if (element->type != ACPI_TYPE_LOCAL_REFERENCE) 590 continue; 591 592 /* Create a symlink to domain objects */ 593 resource->domain_devices[i] = NULL; 594 status = acpi_bus_get_device(element->reference.handle, 595 &resource->domain_devices[i]); 596 if (ACPI_FAILURE(status)) 597 continue; 598 599 obj = resource->domain_devices[i]; 600 get_device(&obj->dev); 601 602 res = sysfs_create_link(resource->holders_dir, &obj->dev.kobj, 603 kobject_name(&obj->dev.kobj)); 604 if (res) { 605 put_device(&obj->dev); 606 resource->domain_devices[i] = NULL; 607 } 608 } 609 610 res = 0; 611 goto end; 612 613 exit_free: 614 kfree(resource->domain_devices); 615 end: 616 kfree(buffer.pointer); 617 return res; 618 } 619 620 /* Registration and deregistration */ 621 static int register_ro_attrs(struct acpi_power_meter_resource *resource, 622 struct ro_sensor_template *ro) 623 { 624 struct device *dev = &resource->acpi_dev->dev; 625 struct sensor_device_attribute *sensors = 626 &resource->sensors[resource->num_sensors]; 627 int res = 0; 628 629 while (ro->label) { 630 sensors->dev_attr.attr.name = ro->label; 631 sensors->dev_attr.attr.mode = S_IRUGO; 632 sensors->dev_attr.show = ro->show; 633 sensors->index = ro->index; 634 635 res = device_create_file(dev, &sensors->dev_attr); 636 if (res) { 637 sensors->dev_attr.attr.name = NULL; 638 goto error; 639 } 640 sensors++; 641 resource->num_sensors++; 642 ro++; 643 } 644 645 error: 646 return res; 647 } 648 649 static int register_rw_attrs(struct acpi_power_meter_resource *resource, 650 struct rw_sensor_template *rw) 651 { 652 struct device *dev = &resource->acpi_dev->dev; 653 struct sensor_device_attribute *sensors = 654 &resource->sensors[resource->num_sensors]; 655 int res = 0; 656 657 while (rw->label) { 658 sensors->dev_attr.attr.name = rw->label; 659 sensors->dev_attr.attr.mode = S_IRUGO | S_IWUSR; 660 sensors->dev_attr.show = rw->show; 661 sensors->dev_attr.store = rw->set; 662 sensors->index = rw->index; 663 664 res = device_create_file(dev, &sensors->dev_attr); 665 if (res) { 666 sensors->dev_attr.attr.name = NULL; 667 goto error; 668 } 669 sensors++; 670 resource->num_sensors++; 671 rw++; 672 } 673 674 error: 675 return res; 676 } 677 678 static void remove_attrs(struct acpi_power_meter_resource *resource) 679 { 680 int i; 681 682 for (i = 0; i < resource->num_sensors; i++) { 683 if (!resource->sensors[i].dev_attr.attr.name) 684 continue; 685 device_remove_file(&resource->acpi_dev->dev, 686 &resource->sensors[i].dev_attr); 687 } 688 689 remove_domain_devices(resource); 690 691 resource->num_sensors = 0; 692 } 693 694 static int setup_attrs(struct acpi_power_meter_resource *resource) 695 { 696 int res = 0; 697 698 res = read_domain_devices(resource); 699 if (res) 700 return res; 701 702 if (resource->caps.flags & POWER_METER_CAN_MEASURE) { 703 res = register_ro_attrs(resource, meter_ro_attrs); 704 if (res) 705 goto error; 706 res = register_rw_attrs(resource, meter_rw_attrs); 707 if (res) 708 goto error; 709 } 710 711 if (resource->caps.flags & POWER_METER_CAN_CAP) { 712 if (!can_cap_in_hardware()) { 713 dev_err(&resource->acpi_dev->dev, 714 "Ignoring unsafe software power cap!\n"); 715 goto skip_unsafe_cap; 716 } 717 718 if (resource->caps.configurable_cap) { 719 res = register_rw_attrs(resource, rw_cap_attrs); 720 if (res) 721 goto error; 722 } else { 723 res = register_ro_attrs(resource, ro_cap_attrs); 724 if (res) 725 goto error; 726 } 727 res = register_ro_attrs(resource, misc_cap_attrs); 728 if (res) 729 goto error; 730 } 731 skip_unsafe_cap: 732 733 if (resource->caps.flags & POWER_METER_CAN_TRIP) { 734 res = register_rw_attrs(resource, trip_attrs); 735 if (res) 736 goto error; 737 } 738 739 res = register_ro_attrs(resource, misc_attrs); 740 if (res) 741 goto error; 742 743 return res; 744 error: 745 remove_attrs(resource); 746 return res; 747 } 748 749 static void free_capabilities(struct acpi_power_meter_resource *resource) 750 { 751 acpi_string *str; 752 int i; 753 754 str = &resource->model_number; 755 for (i = 0; i < 3; i++, str++) 756 kfree(*str); 757 } 758 759 static int read_capabilities(struct acpi_power_meter_resource *resource) 760 { 761 int res = 0; 762 int i; 763 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; 764 struct acpi_buffer state = { 0, NULL }; 765 struct acpi_buffer format = { sizeof("NNNNNNNNNNN"), "NNNNNNNNNNN" }; 766 union acpi_object *pss; 767 acpi_string *str; 768 acpi_status status; 769 770 status = acpi_evaluate_object(resource->acpi_dev->handle, "_PMC", NULL, 771 &buffer); 772 if (ACPI_FAILURE(status)) { 773 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PMC")); 774 return -ENODEV; 775 } 776 777 pss = buffer.pointer; 778 if (!pss || 779 pss->type != ACPI_TYPE_PACKAGE || 780 pss->package.count != 14) { 781 dev_err(&resource->acpi_dev->dev, ACPI_POWER_METER_NAME 782 "Invalid _PMC data\n"); 783 res = -EFAULT; 784 goto end; 785 } 786 787 /* Grab all the integer data at once */ 788 state.length = sizeof(struct acpi_power_meter_capabilities); 789 state.pointer = &resource->caps; 790 791 status = acpi_extract_package(pss, &format, &state); 792 if (ACPI_FAILURE(status)) { 793 ACPI_EXCEPTION((AE_INFO, status, "Invalid data")); 794 res = -EFAULT; 795 goto end; 796 } 797 798 if (resource->caps.units) { 799 dev_err(&resource->acpi_dev->dev, ACPI_POWER_METER_NAME 800 "Unknown units %llu.\n", 801 resource->caps.units); 802 res = -EINVAL; 803 goto end; 804 } 805 806 /* Grab the string data */ 807 str = &resource->model_number; 808 809 for (i = 11; i < 14; i++) { 810 union acpi_object *element = &(pss->package.elements[i]); 811 812 if (element->type != ACPI_TYPE_STRING) { 813 res = -EINVAL; 814 goto error; 815 } 816 817 *str = kzalloc(sizeof(u8) * (element->string.length + 1), 818 GFP_KERNEL); 819 if (!*str) { 820 res = -ENOMEM; 821 goto error; 822 } 823 824 strncpy(*str, element->string.pointer, element->string.length); 825 str++; 826 } 827 828 dev_info(&resource->acpi_dev->dev, "Found ACPI power meter.\n"); 829 goto end; 830 error: 831 str = &resource->model_number; 832 for (i = 0; i < 3; i++, str++) 833 kfree(*str); 834 end: 835 kfree(buffer.pointer); 836 return res; 837 } 838 839 /* Handle ACPI event notifications */ 840 static void acpi_power_meter_notify(struct acpi_device *device, u32 event) 841 { 842 struct acpi_power_meter_resource *resource; 843 int res; 844 845 if (!device || !acpi_driver_data(device)) 846 return; 847 848 resource = acpi_driver_data(device); 849 850 mutex_lock(&resource->lock); 851 switch (event) { 852 case METER_NOTIFY_CONFIG: 853 free_capabilities(resource); 854 res = read_capabilities(resource); 855 if (res) 856 break; 857 858 remove_attrs(resource); 859 setup_attrs(resource); 860 break; 861 case METER_NOTIFY_TRIP: 862 sysfs_notify(&device->dev.kobj, NULL, POWER_AVERAGE_NAME); 863 update_meter(resource); 864 break; 865 case METER_NOTIFY_CAP: 866 sysfs_notify(&device->dev.kobj, NULL, POWER_CAP_NAME); 867 update_cap(resource); 868 break; 869 case METER_NOTIFY_INTERVAL: 870 sysfs_notify(&device->dev.kobj, NULL, POWER_AVG_INTERVAL_NAME); 871 update_avg_interval(resource); 872 break; 873 case METER_NOTIFY_CAPPING: 874 sysfs_notify(&device->dev.kobj, NULL, POWER_ALARM_NAME); 875 dev_info(&device->dev, "Capping in progress.\n"); 876 break; 877 default: 878 BUG(); 879 } 880 mutex_unlock(&resource->lock); 881 882 acpi_bus_generate_netlink_event(ACPI_POWER_METER_CLASS, 883 dev_name(&device->dev), event, 0); 884 } 885 886 static int acpi_power_meter_add(struct acpi_device *device) 887 { 888 int res; 889 struct acpi_power_meter_resource *resource; 890 891 if (!device) 892 return -EINVAL; 893 894 resource = kzalloc(sizeof(struct acpi_power_meter_resource), 895 GFP_KERNEL); 896 if (!resource) 897 return -ENOMEM; 898 899 resource->sensors_valid = 0; 900 resource->acpi_dev = device; 901 mutex_init(&resource->lock); 902 strcpy(acpi_device_name(device), ACPI_POWER_METER_DEVICE_NAME); 903 strcpy(acpi_device_class(device), ACPI_POWER_METER_CLASS); 904 device->driver_data = resource; 905 906 free_capabilities(resource); 907 res = read_capabilities(resource); 908 if (res) 909 goto exit_free; 910 911 resource->trip[0] = resource->trip[1] = -1; 912 913 res = setup_attrs(resource); 914 if (res) 915 goto exit_free; 916 917 resource->hwmon_dev = hwmon_device_register(&device->dev); 918 if (IS_ERR(resource->hwmon_dev)) { 919 res = PTR_ERR(resource->hwmon_dev); 920 goto exit_remove; 921 } 922 923 res = 0; 924 goto exit; 925 926 exit_remove: 927 remove_attrs(resource); 928 exit_free: 929 kfree(resource); 930 exit: 931 return res; 932 } 933 934 static int acpi_power_meter_remove(struct acpi_device *device, int type) 935 { 936 struct acpi_power_meter_resource *resource; 937 938 if (!device || !acpi_driver_data(device)) 939 return -EINVAL; 940 941 resource = acpi_driver_data(device); 942 hwmon_device_unregister(resource->hwmon_dev); 943 944 free_capabilities(resource); 945 remove_attrs(resource); 946 947 kfree(resource); 948 return 0; 949 } 950 951 static int acpi_power_meter_resume(struct acpi_device *device) 952 { 953 struct acpi_power_meter_resource *resource; 954 955 if (!device || !acpi_driver_data(device)) 956 return -EINVAL; 957 958 resource = acpi_driver_data(device); 959 free_capabilities(resource); 960 read_capabilities(resource); 961 962 return 0; 963 } 964 965 static struct acpi_driver acpi_power_meter_driver = { 966 .name = "power_meter", 967 .class = ACPI_POWER_METER_CLASS, 968 .ids = power_meter_ids, 969 .ops = { 970 .add = acpi_power_meter_add, 971 .remove = acpi_power_meter_remove, 972 .resume = acpi_power_meter_resume, 973 .notify = acpi_power_meter_notify, 974 }, 975 }; 976 977 /* Module init/exit routines */ 978 static int __init enable_cap_knobs(const struct dmi_system_id *d) 979 { 980 cap_in_hardware = 1; 981 return 0; 982 } 983 984 static struct dmi_system_id __initdata pm_dmi_table[] = { 985 { 986 enable_cap_knobs, "IBM Active Energy Manager", 987 { 988 DMI_MATCH(DMI_SYS_VENDOR, "IBM") 989 }, 990 }, 991 {} 992 }; 993 994 static int __init acpi_power_meter_init(void) 995 { 996 int result; 997 998 if (acpi_disabled) 999 return -ENODEV; 1000 1001 dmi_check_system(pm_dmi_table); 1002 1003 result = acpi_bus_register_driver(&acpi_power_meter_driver); 1004 if (result < 0) 1005 return -ENODEV; 1006 1007 return 0; 1008 } 1009 1010 static void __exit acpi_power_meter_exit(void) 1011 { 1012 acpi_bus_unregister_driver(&acpi_power_meter_driver); 1013 } 1014 1015 MODULE_AUTHOR("Darrick J. Wong <djwong@us.ibm.com>"); 1016 MODULE_DESCRIPTION("ACPI 4.0 power meter driver"); 1017 MODULE_LICENSE("GPL"); 1018 1019 module_param(force_cap_on, bool, 0644); 1020 MODULE_PARM_DESC(force_cap_on, "Enable power cap even it is unsafe to do so."); 1021 1022 module_init(acpi_power_meter_init); 1023 module_exit(acpi_power_meter_exit); 1024