1// SPDX-License-Identifier: GPL-2.0+ 2// Copyright IBM Corp 2019 3 4#include <linux/device.h> 5#include <linux/export.h> 6#include <linux/hwmon.h> 7#include <linux/hwmon-sysfs.h> 8#include <linux/jiffies.h> 9#include <linux/kernel.h> 10#include <linux/math64.h> 11#include <linux/module.h> 12#include <linux/mutex.h> 13#include <linux/sysfs.h> 14#include <asm/unaligned.h> 15 16#include "common.h" 17 18#define EXTN_FLAG_SENSOR_ID BIT(7) 19 20#define OCC_ERROR_COUNT_THRESHOLD 2 /* required by OCC spec */ 21 22#define OCC_STATE_SAFE 4 23#define OCC_SAFE_TIMEOUT msecs_to_jiffies(60000) /* 1 min */ 24 25#define OCC_UPDATE_FREQUENCY msecs_to_jiffies(1000) 26 27#define OCC_TEMP_SENSOR_FAULT 0xFF 28 29#define OCC_FRU_TYPE_VRM 3 30 31/* OCC sensor type and version definitions */ 32 33struct temp_sensor_1 { 34 u16 sensor_id; 35 u16 value; 36} __packed; 37 38struct temp_sensor_2 { 39 u32 sensor_id; 40 u8 fru_type; 41 u8 value; 42} __packed; 43 44struct freq_sensor_1 { 45 u16 sensor_id; 46 u16 value; 47} __packed; 48 49struct freq_sensor_2 { 50 u32 sensor_id; 51 u16 value; 52} __packed; 53 54struct power_sensor_1 { 55 u16 sensor_id; 56 u32 update_tag; 57 u32 accumulator; 58 u16 value; 59} __packed; 60 61struct power_sensor_2 { 62 u32 sensor_id; 63 u8 function_id; 64 u8 apss_channel; 65 u16 reserved; 66 u32 update_tag; 67 u64 accumulator; 68 u16 value; 69} __packed; 70 71struct power_sensor_data { 72 u16 value; 73 u32 update_tag; 74 u64 accumulator; 75} __packed; 76 77struct power_sensor_data_and_time { 78 u16 update_time; 79 u16 value; 80 u32 update_tag; 81 u64 accumulator; 82} __packed; 83 84struct power_sensor_a0 { 85 u32 sensor_id; 86 struct power_sensor_data_and_time system; 87 u32 reserved; 88 struct power_sensor_data_and_time proc; 89 struct power_sensor_data vdd; 90 struct power_sensor_data vdn; 91} __packed; 92 93struct caps_sensor_2 { 94 u16 cap; 95 u16 system_power; 96 u16 n_cap; 97 u16 max; 98 u16 min; 99 u16 user; 100 u8 user_source; 101} __packed; 102 103struct caps_sensor_3 { 104 u16 cap; 105 u16 system_power; 106 u16 n_cap; 107 u16 max; 108 u16 hard_min; 109 u16 soft_min; 110 u16 user; 111 u8 user_source; 112} __packed; 113 114struct extended_sensor { 115 union { 116 u8 name[4]; 117 u32 sensor_id; 118 }; 119 u8 flags; 120 u8 reserved; 121 u8 data[6]; 122} __packed; 123 124static int occ_poll(struct occ *occ) 125{ 126 int rc; 127 u16 checksum = occ->poll_cmd_data + occ->seq_no + 1; 128 u8 cmd[8]; 129 struct occ_poll_response_header *header; 130 131 /* big endian */ 132 cmd[0] = occ->seq_no++; /* sequence number */ 133 cmd[1] = 0; /* cmd type */ 134 cmd[2] = 0; /* data length msb */ 135 cmd[3] = 1; /* data length lsb */ 136 cmd[4] = occ->poll_cmd_data; /* data */ 137 cmd[5] = checksum >> 8; /* checksum msb */ 138 cmd[6] = checksum & 0xFF; /* checksum lsb */ 139 cmd[7] = 0; 140 141 /* mutex should already be locked if necessary */ 142 rc = occ->send_cmd(occ, cmd); 143 if (rc) { 144 occ->last_error = rc; 145 if (occ->error_count++ > OCC_ERROR_COUNT_THRESHOLD) 146 occ->error = rc; 147 148 goto done; 149 } 150 151 /* clear error since communication was successful */ 152 occ->error_count = 0; 153 occ->last_error = 0; 154 occ->error = 0; 155 156 /* check for safe state */ 157 header = (struct occ_poll_response_header *)occ->resp.data; 158 if (header->occ_state == OCC_STATE_SAFE) { 159 if (occ->last_safe) { 160 if (time_after(jiffies, 161 occ->last_safe + OCC_SAFE_TIMEOUT)) 162 occ->error = -EHOSTDOWN; 163 } else { 164 occ->last_safe = jiffies; 165 } 166 } else { 167 occ->last_safe = 0; 168 } 169 170done: 171 occ_sysfs_poll_done(occ); 172 return rc; 173} 174 175static int occ_set_user_power_cap(struct occ *occ, u16 user_power_cap) 176{ 177 int rc; 178 u8 cmd[8]; 179 u16 checksum = 0x24; 180 __be16 user_power_cap_be = cpu_to_be16(user_power_cap); 181 182 cmd[0] = 0; 183 cmd[1] = 0x22; 184 cmd[2] = 0; 185 cmd[3] = 2; 186 187 memcpy(&cmd[4], &user_power_cap_be, 2); 188 189 checksum += cmd[4] + cmd[5]; 190 cmd[6] = checksum >> 8; 191 cmd[7] = checksum & 0xFF; 192 193 rc = mutex_lock_interruptible(&occ->lock); 194 if (rc) 195 return rc; 196 197 rc = occ->send_cmd(occ, cmd); 198 199 mutex_unlock(&occ->lock); 200 201 return rc; 202} 203 204int occ_update_response(struct occ *occ) 205{ 206 int rc = mutex_lock_interruptible(&occ->lock); 207 208 if (rc) 209 return rc; 210 211 /* limit the maximum rate of polling the OCC */ 212 if (time_after(jiffies, occ->next_update)) { 213 rc = occ_poll(occ); 214 occ->next_update = jiffies + OCC_UPDATE_FREQUENCY; 215 } else { 216 rc = occ->last_error; 217 } 218 219 mutex_unlock(&occ->lock); 220 return rc; 221} 222 223static ssize_t occ_show_temp_1(struct device *dev, 224 struct device_attribute *attr, char *buf) 225{ 226 int rc; 227 u32 val = 0; 228 struct temp_sensor_1 *temp; 229 struct occ *occ = dev_get_drvdata(dev); 230 struct occ_sensors *sensors = &occ->sensors; 231 struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr); 232 233 rc = occ_update_response(occ); 234 if (rc) 235 return rc; 236 237 temp = ((struct temp_sensor_1 *)sensors->temp.data) + sattr->index; 238 239 switch (sattr->nr) { 240 case 0: 241 val = get_unaligned_be16(&temp->sensor_id); 242 break; 243 case 1: 244 /* 245 * If a sensor reading has expired and couldn't be refreshed, 246 * OCC returns 0xFFFF for that sensor. 247 */ 248 if (temp->value == 0xFFFF) 249 return -EREMOTEIO; 250 val = get_unaligned_be16(&temp->value) * 1000; 251 break; 252 default: 253 return -EINVAL; 254 } 255 256 return snprintf(buf, PAGE_SIZE - 1, "%u\n", val); 257} 258 259static ssize_t occ_show_temp_2(struct device *dev, 260 struct device_attribute *attr, char *buf) 261{ 262 int rc; 263 u32 val = 0; 264 struct temp_sensor_2 *temp; 265 struct occ *occ = dev_get_drvdata(dev); 266 struct occ_sensors *sensors = &occ->sensors; 267 struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr); 268 269 rc = occ_update_response(occ); 270 if (rc) 271 return rc; 272 273 temp = ((struct temp_sensor_2 *)sensors->temp.data) + sattr->index; 274 275 switch (sattr->nr) { 276 case 0: 277 val = get_unaligned_be32(&temp->sensor_id); 278 break; 279 case 1: 280 val = temp->value; 281 if (val == OCC_TEMP_SENSOR_FAULT) 282 return -EREMOTEIO; 283 284 /* 285 * VRM doesn't return temperature, only alarm bit. This 286 * attribute maps to tempX_alarm instead of tempX_input for 287 * VRM 288 */ 289 if (temp->fru_type != OCC_FRU_TYPE_VRM) { 290 /* sensor not ready */ 291 if (val == 0) 292 return -EAGAIN; 293 294 val *= 1000; 295 } 296 break; 297 case 2: 298 val = temp->fru_type; 299 break; 300 case 3: 301 val = temp->value == OCC_TEMP_SENSOR_FAULT; 302 break; 303 default: 304 return -EINVAL; 305 } 306 307 return snprintf(buf, PAGE_SIZE - 1, "%u\n", val); 308} 309 310static ssize_t occ_show_freq_1(struct device *dev, 311 struct device_attribute *attr, char *buf) 312{ 313 int rc; 314 u16 val = 0; 315 struct freq_sensor_1 *freq; 316 struct occ *occ = dev_get_drvdata(dev); 317 struct occ_sensors *sensors = &occ->sensors; 318 struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr); 319 320 rc = occ_update_response(occ); 321 if (rc) 322 return rc; 323 324 freq = ((struct freq_sensor_1 *)sensors->freq.data) + sattr->index; 325 326 switch (sattr->nr) { 327 case 0: 328 val = get_unaligned_be16(&freq->sensor_id); 329 break; 330 case 1: 331 val = get_unaligned_be16(&freq->value); 332 break; 333 default: 334 return -EINVAL; 335 } 336 337 return snprintf(buf, PAGE_SIZE - 1, "%u\n", val); 338} 339 340static ssize_t occ_show_freq_2(struct device *dev, 341 struct device_attribute *attr, char *buf) 342{ 343 int rc; 344 u32 val = 0; 345 struct freq_sensor_2 *freq; 346 struct occ *occ = dev_get_drvdata(dev); 347 struct occ_sensors *sensors = &occ->sensors; 348 struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr); 349 350 rc = occ_update_response(occ); 351 if (rc) 352 return rc; 353 354 freq = ((struct freq_sensor_2 *)sensors->freq.data) + sattr->index; 355 356 switch (sattr->nr) { 357 case 0: 358 val = get_unaligned_be32(&freq->sensor_id); 359 break; 360 case 1: 361 val = get_unaligned_be16(&freq->value); 362 break; 363 default: 364 return -EINVAL; 365 } 366 367 return snprintf(buf, PAGE_SIZE - 1, "%u\n", val); 368} 369 370static ssize_t occ_show_power_1(struct device *dev, 371 struct device_attribute *attr, char *buf) 372{ 373 int rc; 374 u64 val = 0; 375 struct power_sensor_1 *power; 376 struct occ *occ = dev_get_drvdata(dev); 377 struct occ_sensors *sensors = &occ->sensors; 378 struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr); 379 380 rc = occ_update_response(occ); 381 if (rc) 382 return rc; 383 384 power = ((struct power_sensor_1 *)sensors->power.data) + sattr->index; 385 386 switch (sattr->nr) { 387 case 0: 388 val = get_unaligned_be16(&power->sensor_id); 389 break; 390 case 1: 391 val = get_unaligned_be32(&power->accumulator) / 392 get_unaligned_be32(&power->update_tag); 393 val *= 1000000ULL; 394 break; 395 case 2: 396 val = (u64)get_unaligned_be32(&power->update_tag) * 397 occ->powr_sample_time_us; 398 break; 399 case 3: 400 val = get_unaligned_be16(&power->value) * 1000000ULL; 401 break; 402 default: 403 return -EINVAL; 404 } 405 406 return snprintf(buf, PAGE_SIZE - 1, "%llu\n", val); 407} 408 409static u64 occ_get_powr_avg(u64 *accum, u32 *samples) 410{ 411 u64 divisor = get_unaligned_be32(samples); 412 413 return (divisor == 0) ? 0 : 414 div64_u64(get_unaligned_be64(accum) * 1000000ULL, divisor); 415} 416 417static ssize_t occ_show_power_2(struct device *dev, 418 struct device_attribute *attr, char *buf) 419{ 420 int rc; 421 u64 val = 0; 422 struct power_sensor_2 *power; 423 struct occ *occ = dev_get_drvdata(dev); 424 struct occ_sensors *sensors = &occ->sensors; 425 struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr); 426 427 rc = occ_update_response(occ); 428 if (rc) 429 return rc; 430 431 power = ((struct power_sensor_2 *)sensors->power.data) + sattr->index; 432 433 switch (sattr->nr) { 434 case 0: 435 return snprintf(buf, PAGE_SIZE - 1, "%u_%u_%u\n", 436 get_unaligned_be32(&power->sensor_id), 437 power->function_id, power->apss_channel); 438 case 1: 439 val = occ_get_powr_avg(&power->accumulator, 440 &power->update_tag); 441 break; 442 case 2: 443 val = (u64)get_unaligned_be32(&power->update_tag) * 444 occ->powr_sample_time_us; 445 break; 446 case 3: 447 val = get_unaligned_be16(&power->value) * 1000000ULL; 448 break; 449 default: 450 return -EINVAL; 451 } 452 453 return snprintf(buf, PAGE_SIZE - 1, "%llu\n", val); 454} 455 456static ssize_t occ_show_power_a0(struct device *dev, 457 struct device_attribute *attr, char *buf) 458{ 459 int rc; 460 u64 val = 0; 461 struct power_sensor_a0 *power; 462 struct occ *occ = dev_get_drvdata(dev); 463 struct occ_sensors *sensors = &occ->sensors; 464 struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr); 465 466 rc = occ_update_response(occ); 467 if (rc) 468 return rc; 469 470 power = ((struct power_sensor_a0 *)sensors->power.data) + sattr->index; 471 472 switch (sattr->nr) { 473 case 0: 474 return snprintf(buf, PAGE_SIZE - 1, "%u_system\n", 475 get_unaligned_be32(&power->sensor_id)); 476 case 1: 477 val = occ_get_powr_avg(&power->system.accumulator, 478 &power->system.update_tag); 479 break; 480 case 2: 481 val = (u64)get_unaligned_be32(&power->system.update_tag) * 482 occ->powr_sample_time_us; 483 break; 484 case 3: 485 val = get_unaligned_be16(&power->system.value) * 1000000ULL; 486 break; 487 case 4: 488 return snprintf(buf, PAGE_SIZE - 1, "%u_proc\n", 489 get_unaligned_be32(&power->sensor_id)); 490 case 5: 491 val = occ_get_powr_avg(&power->proc.accumulator, 492 &power->proc.update_tag); 493 break; 494 case 6: 495 val = (u64)get_unaligned_be32(&power->proc.update_tag) * 496 occ->powr_sample_time_us; 497 break; 498 case 7: 499 val = get_unaligned_be16(&power->proc.value) * 1000000ULL; 500 break; 501 case 8: 502 return snprintf(buf, PAGE_SIZE - 1, "%u_vdd\n", 503 get_unaligned_be32(&power->sensor_id)); 504 case 9: 505 val = occ_get_powr_avg(&power->vdd.accumulator, 506 &power->vdd.update_tag); 507 break; 508 case 10: 509 val = (u64)get_unaligned_be32(&power->vdd.update_tag) * 510 occ->powr_sample_time_us; 511 break; 512 case 11: 513 val = get_unaligned_be16(&power->vdd.value) * 1000000ULL; 514 break; 515 case 12: 516 return snprintf(buf, PAGE_SIZE - 1, "%u_vdn\n", 517 get_unaligned_be32(&power->sensor_id)); 518 case 13: 519 val = occ_get_powr_avg(&power->vdn.accumulator, 520 &power->vdn.update_tag); 521 break; 522 case 14: 523 val = (u64)get_unaligned_be32(&power->vdn.update_tag) * 524 occ->powr_sample_time_us; 525 break; 526 case 15: 527 val = get_unaligned_be16(&power->vdn.value) * 1000000ULL; 528 break; 529 default: 530 return -EINVAL; 531 } 532 533 return snprintf(buf, PAGE_SIZE - 1, "%llu\n", val); 534} 535 536static ssize_t occ_show_caps_1_2(struct device *dev, 537 struct device_attribute *attr, char *buf) 538{ 539 int rc; 540 u64 val = 0; 541 struct caps_sensor_2 *caps; 542 struct occ *occ = dev_get_drvdata(dev); 543 struct occ_sensors *sensors = &occ->sensors; 544 struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr); 545 546 rc = occ_update_response(occ); 547 if (rc) 548 return rc; 549 550 caps = ((struct caps_sensor_2 *)sensors->caps.data) + sattr->index; 551 552 switch (sattr->nr) { 553 case 0: 554 return snprintf(buf, PAGE_SIZE - 1, "system\n"); 555 case 1: 556 val = get_unaligned_be16(&caps->cap) * 1000000ULL; 557 break; 558 case 2: 559 val = get_unaligned_be16(&caps->system_power) * 1000000ULL; 560 break; 561 case 3: 562 val = get_unaligned_be16(&caps->n_cap) * 1000000ULL; 563 break; 564 case 4: 565 val = get_unaligned_be16(&caps->max) * 1000000ULL; 566 break; 567 case 5: 568 val = get_unaligned_be16(&caps->min) * 1000000ULL; 569 break; 570 case 6: 571 val = get_unaligned_be16(&caps->user) * 1000000ULL; 572 break; 573 case 7: 574 if (occ->sensors.caps.version == 1) 575 return -EINVAL; 576 577 val = caps->user_source; 578 break; 579 default: 580 return -EINVAL; 581 } 582 583 return snprintf(buf, PAGE_SIZE - 1, "%llu\n", val); 584} 585 586static ssize_t occ_show_caps_3(struct device *dev, 587 struct device_attribute *attr, char *buf) 588{ 589 int rc; 590 u64 val = 0; 591 struct caps_sensor_3 *caps; 592 struct occ *occ = dev_get_drvdata(dev); 593 struct occ_sensors *sensors = &occ->sensors; 594 struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr); 595 596 rc = occ_update_response(occ); 597 if (rc) 598 return rc; 599 600 caps = ((struct caps_sensor_3 *)sensors->caps.data) + sattr->index; 601 602 switch (sattr->nr) { 603 case 0: 604 return snprintf(buf, PAGE_SIZE - 1, "system\n"); 605 case 1: 606 val = get_unaligned_be16(&caps->cap) * 1000000ULL; 607 break; 608 case 2: 609 val = get_unaligned_be16(&caps->system_power) * 1000000ULL; 610 break; 611 case 3: 612 val = get_unaligned_be16(&caps->n_cap) * 1000000ULL; 613 break; 614 case 4: 615 val = get_unaligned_be16(&caps->max) * 1000000ULL; 616 break; 617 case 5: 618 val = get_unaligned_be16(&caps->hard_min) * 1000000ULL; 619 break; 620 case 6: 621 val = get_unaligned_be16(&caps->user) * 1000000ULL; 622 break; 623 case 7: 624 val = caps->user_source; 625 break; 626 default: 627 return -EINVAL; 628 } 629 630 return snprintf(buf, PAGE_SIZE - 1, "%llu\n", val); 631} 632 633static ssize_t occ_store_caps_user(struct device *dev, 634 struct device_attribute *attr, 635 const char *buf, size_t count) 636{ 637 int rc; 638 u16 user_power_cap; 639 unsigned long long value; 640 struct occ *occ = dev_get_drvdata(dev); 641 642 rc = kstrtoull(buf, 0, &value); 643 if (rc) 644 return rc; 645 646 user_power_cap = div64_u64(value, 1000000ULL); /* microwatt to watt */ 647 648 rc = occ_set_user_power_cap(occ, user_power_cap); 649 if (rc) 650 return rc; 651 652 return count; 653} 654 655static ssize_t occ_show_extended(struct device *dev, 656 struct device_attribute *attr, char *buf) 657{ 658 int rc; 659 struct extended_sensor *extn; 660 struct occ *occ = dev_get_drvdata(dev); 661 struct occ_sensors *sensors = &occ->sensors; 662 struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr); 663 664 rc = occ_update_response(occ); 665 if (rc) 666 return rc; 667 668 extn = ((struct extended_sensor *)sensors->extended.data) + 669 sattr->index; 670 671 switch (sattr->nr) { 672 case 0: 673 if (extn->flags & EXTN_FLAG_SENSOR_ID) 674 rc = snprintf(buf, PAGE_SIZE - 1, "%u", 675 get_unaligned_be32(&extn->sensor_id)); 676 else 677 rc = snprintf(buf, PAGE_SIZE - 1, "%02x%02x%02x%02x\n", 678 extn->name[0], extn->name[1], 679 extn->name[2], extn->name[3]); 680 break; 681 case 1: 682 rc = snprintf(buf, PAGE_SIZE - 1, "%02x\n", extn->flags); 683 break; 684 case 2: 685 rc = snprintf(buf, PAGE_SIZE - 1, "%02x%02x%02x%02x%02x%02x\n", 686 extn->data[0], extn->data[1], extn->data[2], 687 extn->data[3], extn->data[4], extn->data[5]); 688 break; 689 default: 690 return -EINVAL; 691 } 692 693 return rc; 694} 695 696/* 697 * Some helper macros to make it easier to define an occ_attribute. Since these 698 * are dynamically allocated, we shouldn't use the existing kernel macros which 699 * stringify the name argument. 700 */ 701#define ATTR_OCC(_name, _mode, _show, _store) { \ 702 .attr = { \ 703 .name = _name, \ 704 .mode = VERIFY_OCTAL_PERMISSIONS(_mode), \ 705 }, \ 706 .show = _show, \ 707 .store = _store, \ 708} 709 710#define SENSOR_ATTR_OCC(_name, _mode, _show, _store, _nr, _index) { \ 711 .dev_attr = ATTR_OCC(_name, _mode, _show, _store), \ 712 .index = _index, \ 713 .nr = _nr, \ 714} 715 716#define OCC_INIT_ATTR(_name, _mode, _show, _store, _nr, _index) \ 717 ((struct sensor_device_attribute_2) \ 718 SENSOR_ATTR_OCC(_name, _mode, _show, _store, _nr, _index)) 719 720/* 721 * Allocate and instatiate sensor_device_attribute_2s. It's most efficient to 722 * use our own instead of the built-in hwmon attribute types. 723 */ 724static int occ_setup_sensor_attrs(struct occ *occ) 725{ 726 unsigned int i, s, num_attrs = 0; 727 struct device *dev = occ->bus_dev; 728 struct occ_sensors *sensors = &occ->sensors; 729 struct occ_attribute *attr; 730 struct temp_sensor_2 *temp; 731 ssize_t (*show_temp)(struct device *, struct device_attribute *, 732 char *) = occ_show_temp_1; 733 ssize_t (*show_freq)(struct device *, struct device_attribute *, 734 char *) = occ_show_freq_1; 735 ssize_t (*show_power)(struct device *, struct device_attribute *, 736 char *) = occ_show_power_1; 737 ssize_t (*show_caps)(struct device *, struct device_attribute *, 738 char *) = occ_show_caps_1_2; 739 740 switch (sensors->temp.version) { 741 case 1: 742 num_attrs += (sensors->temp.num_sensors * 2); 743 break; 744 case 2: 745 num_attrs += (sensors->temp.num_sensors * 4); 746 show_temp = occ_show_temp_2; 747 break; 748 default: 749 sensors->temp.num_sensors = 0; 750 } 751 752 switch (sensors->freq.version) { 753 case 2: 754 show_freq = occ_show_freq_2; 755 fallthrough; 756 case 1: 757 num_attrs += (sensors->freq.num_sensors * 2); 758 break; 759 default: 760 sensors->freq.num_sensors = 0; 761 } 762 763 switch (sensors->power.version) { 764 case 2: 765 show_power = occ_show_power_2; 766 fallthrough; 767 case 1: 768 num_attrs += (sensors->power.num_sensors * 4); 769 break; 770 case 0xA0: 771 num_attrs += (sensors->power.num_sensors * 16); 772 show_power = occ_show_power_a0; 773 break; 774 default: 775 sensors->power.num_sensors = 0; 776 } 777 778 switch (sensors->caps.version) { 779 case 1: 780 num_attrs += (sensors->caps.num_sensors * 7); 781 break; 782 case 3: 783 show_caps = occ_show_caps_3; 784 fallthrough; 785 case 2: 786 num_attrs += (sensors->caps.num_sensors * 8); 787 break; 788 default: 789 sensors->caps.num_sensors = 0; 790 } 791 792 switch (sensors->extended.version) { 793 case 1: 794 num_attrs += (sensors->extended.num_sensors * 3); 795 break; 796 default: 797 sensors->extended.num_sensors = 0; 798 } 799 800 occ->attrs = devm_kzalloc(dev, sizeof(*occ->attrs) * num_attrs, 801 GFP_KERNEL); 802 if (!occ->attrs) 803 return -ENOMEM; 804 805 /* null-terminated list */ 806 occ->group.attrs = devm_kzalloc(dev, sizeof(*occ->group.attrs) * 807 num_attrs + 1, GFP_KERNEL); 808 if (!occ->group.attrs) 809 return -ENOMEM; 810 811 attr = occ->attrs; 812 813 for (i = 0; i < sensors->temp.num_sensors; ++i) { 814 s = i + 1; 815 temp = ((struct temp_sensor_2 *)sensors->temp.data) + i; 816 817 snprintf(attr->name, sizeof(attr->name), "temp%d_label", s); 818 attr->sensor = OCC_INIT_ATTR(attr->name, 0444, show_temp, NULL, 819 0, i); 820 attr++; 821 822 if (sensors->temp.version > 1 && 823 temp->fru_type == OCC_FRU_TYPE_VRM) { 824 snprintf(attr->name, sizeof(attr->name), 825 "temp%d_alarm", s); 826 } else { 827 snprintf(attr->name, sizeof(attr->name), 828 "temp%d_input", s); 829 } 830 831 attr->sensor = OCC_INIT_ATTR(attr->name, 0444, show_temp, NULL, 832 1, i); 833 attr++; 834 835 if (sensors->temp.version > 1) { 836 snprintf(attr->name, sizeof(attr->name), 837 "temp%d_fru_type", s); 838 attr->sensor = OCC_INIT_ATTR(attr->name, 0444, 839 show_temp, NULL, 2, i); 840 attr++; 841 842 snprintf(attr->name, sizeof(attr->name), 843 "temp%d_fault", s); 844 attr->sensor = OCC_INIT_ATTR(attr->name, 0444, 845 show_temp, NULL, 3, i); 846 attr++; 847 } 848 } 849 850 for (i = 0; i < sensors->freq.num_sensors; ++i) { 851 s = i + 1; 852 853 snprintf(attr->name, sizeof(attr->name), "freq%d_label", s); 854 attr->sensor = OCC_INIT_ATTR(attr->name, 0444, show_freq, NULL, 855 0, i); 856 attr++; 857 858 snprintf(attr->name, sizeof(attr->name), "freq%d_input", s); 859 attr->sensor = OCC_INIT_ATTR(attr->name, 0444, show_freq, NULL, 860 1, i); 861 attr++; 862 } 863 864 if (sensors->power.version == 0xA0) { 865 /* 866 * Special case for many-attribute power sensor. Split it into 867 * a sensor number per power type, emulating several sensors. 868 */ 869 for (i = 0; i < sensors->power.num_sensors; ++i) { 870 unsigned int j; 871 unsigned int nr = 0; 872 873 s = (i * 4) + 1; 874 875 for (j = 0; j < 4; ++j) { 876 snprintf(attr->name, sizeof(attr->name), 877 "power%d_label", s); 878 attr->sensor = OCC_INIT_ATTR(attr->name, 0444, 879 show_power, NULL, 880 nr++, i); 881 attr++; 882 883 snprintf(attr->name, sizeof(attr->name), 884 "power%d_average", s); 885 attr->sensor = OCC_INIT_ATTR(attr->name, 0444, 886 show_power, NULL, 887 nr++, i); 888 attr++; 889 890 snprintf(attr->name, sizeof(attr->name), 891 "power%d_average_interval", s); 892 attr->sensor = OCC_INIT_ATTR(attr->name, 0444, 893 show_power, NULL, 894 nr++, i); 895 attr++; 896 897 snprintf(attr->name, sizeof(attr->name), 898 "power%d_input", s); 899 attr->sensor = OCC_INIT_ATTR(attr->name, 0444, 900 show_power, NULL, 901 nr++, i); 902 attr++; 903 904 s++; 905 } 906 } 907 908 s = (sensors->power.num_sensors * 4) + 1; 909 } else { 910 for (i = 0; i < sensors->power.num_sensors; ++i) { 911 s = i + 1; 912 913 snprintf(attr->name, sizeof(attr->name), 914 "power%d_label", s); 915 attr->sensor = OCC_INIT_ATTR(attr->name, 0444, 916 show_power, NULL, 0, i); 917 attr++; 918 919 snprintf(attr->name, sizeof(attr->name), 920 "power%d_average", s); 921 attr->sensor = OCC_INIT_ATTR(attr->name, 0444, 922 show_power, NULL, 1, i); 923 attr++; 924 925 snprintf(attr->name, sizeof(attr->name), 926 "power%d_average_interval", s); 927 attr->sensor = OCC_INIT_ATTR(attr->name, 0444, 928 show_power, NULL, 2, i); 929 attr++; 930 931 snprintf(attr->name, sizeof(attr->name), 932 "power%d_input", s); 933 attr->sensor = OCC_INIT_ATTR(attr->name, 0444, 934 show_power, NULL, 3, i); 935 attr++; 936 } 937 938 s = sensors->power.num_sensors + 1; 939 } 940 941 if (sensors->caps.num_sensors >= 1) { 942 snprintf(attr->name, sizeof(attr->name), "power%d_label", s); 943 attr->sensor = OCC_INIT_ATTR(attr->name, 0444, show_caps, NULL, 944 0, 0); 945 attr++; 946 947 snprintf(attr->name, sizeof(attr->name), "power%d_cap", s); 948 attr->sensor = OCC_INIT_ATTR(attr->name, 0444, show_caps, NULL, 949 1, 0); 950 attr++; 951 952 snprintf(attr->name, sizeof(attr->name), "power%d_input", s); 953 attr->sensor = OCC_INIT_ATTR(attr->name, 0444, show_caps, NULL, 954 2, 0); 955 attr++; 956 957 snprintf(attr->name, sizeof(attr->name), 958 "power%d_cap_not_redundant", s); 959 attr->sensor = OCC_INIT_ATTR(attr->name, 0444, show_caps, NULL, 960 3, 0); 961 attr++; 962 963 snprintf(attr->name, sizeof(attr->name), "power%d_cap_max", s); 964 attr->sensor = OCC_INIT_ATTR(attr->name, 0444, show_caps, NULL, 965 4, 0); 966 attr++; 967 968 snprintf(attr->name, sizeof(attr->name), "power%d_cap_min", s); 969 attr->sensor = OCC_INIT_ATTR(attr->name, 0444, show_caps, NULL, 970 5, 0); 971 attr++; 972 973 snprintf(attr->name, sizeof(attr->name), "power%d_cap_user", 974 s); 975 attr->sensor = OCC_INIT_ATTR(attr->name, 0644, show_caps, 976 occ_store_caps_user, 6, 0); 977 attr++; 978 979 if (sensors->caps.version > 1) { 980 snprintf(attr->name, sizeof(attr->name), 981 "power%d_cap_user_source", s); 982 attr->sensor = OCC_INIT_ATTR(attr->name, 0444, 983 show_caps, NULL, 7, 0); 984 attr++; 985 } 986 } 987 988 for (i = 0; i < sensors->extended.num_sensors; ++i) { 989 s = i + 1; 990 991 snprintf(attr->name, sizeof(attr->name), "extn%d_label", s); 992 attr->sensor = OCC_INIT_ATTR(attr->name, 0444, 993 occ_show_extended, NULL, 0, i); 994 attr++; 995 996 snprintf(attr->name, sizeof(attr->name), "extn%d_flags", s); 997 attr->sensor = OCC_INIT_ATTR(attr->name, 0444, 998 occ_show_extended, NULL, 1, i); 999 attr++; 1000 1001 snprintf(attr->name, sizeof(attr->name), "extn%d_input", s); 1002 attr->sensor = OCC_INIT_ATTR(attr->name, 0444, 1003 occ_show_extended, NULL, 2, i); 1004 attr++; 1005 } 1006 1007 /* put the sensors in the group */ 1008 for (i = 0; i < num_attrs; ++i) { 1009 sysfs_attr_init(&occ->attrs[i].sensor.dev_attr.attr); 1010 occ->group.attrs[i] = &occ->attrs[i].sensor.dev_attr.attr; 1011 } 1012 1013 return 0; 1014} 1015 1016/* only need to do this once at startup, as OCC won't change sensors on us */ 1017static void occ_parse_poll_response(struct occ *occ) 1018{ 1019 unsigned int i, old_offset, offset = 0, size = 0; 1020 struct occ_sensor *sensor; 1021 struct occ_sensors *sensors = &occ->sensors; 1022 struct occ_response *resp = &occ->resp; 1023 struct occ_poll_response *poll = 1024 (struct occ_poll_response *)&resp->data[0]; 1025 struct occ_poll_response_header *header = &poll->header; 1026 struct occ_sensor_data_block *block = &poll->block; 1027 1028 dev_info(occ->bus_dev, "OCC found, code level: %.16s\n", 1029 header->occ_code_level); 1030 1031 for (i = 0; i < header->num_sensor_data_blocks; ++i) { 1032 block = (struct occ_sensor_data_block *)((u8 *)block + offset); 1033 old_offset = offset; 1034 offset = (block->header.num_sensors * 1035 block->header.sensor_length) + sizeof(block->header); 1036 size += offset; 1037 1038 /* validate all the length/size fields */ 1039 if ((size + sizeof(*header)) >= OCC_RESP_DATA_BYTES) { 1040 dev_warn(occ->bus_dev, "exceeded response buffer\n"); 1041 return; 1042 } 1043 1044 dev_dbg(occ->bus_dev, " %04x..%04x: %.4s (%d sensors)\n", 1045 old_offset, offset - 1, block->header.eye_catcher, 1046 block->header.num_sensors); 1047 1048 /* match sensor block type */ 1049 if (strncmp(block->header.eye_catcher, "TEMP", 4) == 0) 1050 sensor = &sensors->temp; 1051 else if (strncmp(block->header.eye_catcher, "FREQ", 4) == 0) 1052 sensor = &sensors->freq; 1053 else if (strncmp(block->header.eye_catcher, "POWR", 4) == 0) 1054 sensor = &sensors->power; 1055 else if (strncmp(block->header.eye_catcher, "CAPS", 4) == 0) 1056 sensor = &sensors->caps; 1057 else if (strncmp(block->header.eye_catcher, "EXTN", 4) == 0) 1058 sensor = &sensors->extended; 1059 else { 1060 dev_warn(occ->bus_dev, "sensor not supported %.4s\n", 1061 block->header.eye_catcher); 1062 continue; 1063 } 1064 1065 sensor->num_sensors = block->header.num_sensors; 1066 sensor->version = block->header.sensor_format; 1067 sensor->data = &block->data; 1068 } 1069 1070 dev_dbg(occ->bus_dev, "Max resp size: %u+%zd=%zd\n", size, 1071 sizeof(*header), size + sizeof(*header)); 1072} 1073 1074int occ_setup(struct occ *occ, const char *name) 1075{ 1076 int rc; 1077 1078 mutex_init(&occ->lock); 1079 occ->groups[0] = &occ->group; 1080 1081 /* no need to lock */ 1082 rc = occ_poll(occ); 1083 if (rc == -ESHUTDOWN) { 1084 dev_info(occ->bus_dev, "host is not ready\n"); 1085 return rc; 1086 } else if (rc < 0) { 1087 dev_err(occ->bus_dev, "failed to get OCC poll response: %d\n", 1088 rc); 1089 return rc; 1090 } 1091 1092 occ->next_update = jiffies + OCC_UPDATE_FREQUENCY; 1093 occ_parse_poll_response(occ); 1094 1095 rc = occ_setup_sensor_attrs(occ); 1096 if (rc) { 1097 dev_err(occ->bus_dev, "failed to setup sensor attrs: %d\n", 1098 rc); 1099 return rc; 1100 } 1101 1102 occ->hwmon = devm_hwmon_device_register_with_groups(occ->bus_dev, name, 1103 occ, occ->groups); 1104 if (IS_ERR(occ->hwmon)) { 1105 rc = PTR_ERR(occ->hwmon); 1106 dev_err(occ->bus_dev, "failed to register hwmon device: %d\n", 1107 rc); 1108 return rc; 1109 } 1110 1111 rc = occ_setup_sysfs(occ); 1112 if (rc) 1113 dev_err(occ->bus_dev, "failed to setup sysfs: %d\n", rc); 1114 1115 return rc; 1116} 1117EXPORT_SYMBOL_GPL(occ_setup); 1118 1119MODULE_AUTHOR("Eddie James <eajames@linux.ibm.com>"); 1120MODULE_DESCRIPTION("Common OCC hwmon code"); 1121MODULE_LICENSE("GPL"); 1122