drivers/hwmon/occ/common.c

   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
  33 struct temp_sensor_1 {
  34         u16 sensor_id;
  35         u16 value;
  36 } __packed;
  37
  38 struct temp_sensor_2 {
  39         u32 sensor_id;
  40         u8 fru_type;
  41         u8 value;
  42 } __packed;
  43
  44 struct freq_sensor_1 {
  45         u16 sensor_id;
  46         u16 value;
  47 } __packed;
  48
  49 struct freq_sensor_2 {
  50         u32 sensor_id;
  51         u16 value;
  52 } __packed;
  53
  54 struct power_sensor_1 {
  55         u16 sensor_id;
  56         u32 update_tag;
  57         u32 accumulator;
  58         u16 value;
  59 } __packed;
  60
  61 struct 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
  71 struct power_sensor_data {
  72         u16 value;
  73         u32 update_tag;
  74         u64 accumulator;
  75 } __packed;
  76
  77 struct power_sensor_data_and_time {
  78         u16 update_time;
  79         u16 value;
  80         u32 update_tag;
  81         u64 accumulator;
  82 } __packed;
  83
  84 struct 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
  93 struct 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
 103 struct 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
 114 struct 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
 124 static 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
 170 done:
 171         occ_sysfs_poll_done(occ);
 172         return rc;
 173 }
 174
 175 static 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
 204 int 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->last_update + OCC_UPDATE_FREQUENCY)) {
 213                 rc = occ_poll(occ);
 214                 occ->last_update = jiffies;
 215         } else {
 216                 rc = occ->last_error;
 217         }
 218
 219         mutex_unlock(&occ->lock);
 220         return rc;
 221 }
 222
 223 static 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
 259 static 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
 310 static 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
 340 static 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
 370 static 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
 409 static u64 occ_get_powr_avg(u64 *accum, u32 *samples)
 410 {
 411         return div64_u64(get_unaligned_be64(accum) * 1000000ULL,
 412                          get_unaligned_be32(samples));
 413 }
 414
 415 static ssize_t occ_show_power_2(struct device *dev,
 416                                 struct device_attribute *attr, char *buf)
 417 {
 418         int rc;
 419         u64 val = 0;
 420         struct power_sensor_2 *power;
 421         struct occ *occ = dev_get_drvdata(dev);
 422         struct occ_sensors *sensors = &occ->sensors;
 423         struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
 424
 425         rc = occ_update_response(occ);
 426         if (rc)
 427                 return rc;
 428
 429         power = ((struct power_sensor_2 *)sensors->power.data) + sattr->index;
 430
 431         switch (sattr->nr) {
 432         case 0:
 433                 return snprintf(buf, PAGE_SIZE - 1, "%u_%u_%u\n",
 434                                 get_unaligned_be32(&power->sensor_id),
 435                                 power->function_id, power->apss_channel);
 436         case 1:
 437                 val = occ_get_powr_avg(&power->accumulator,
 438                                        &power->update_tag);
 439                 break;
 440         case 2:
 441                 val = (u64)get_unaligned_be32(&power->update_tag) *
 442                            occ->powr_sample_time_us;
 443                 break;
 444         case 3:
 445                 val = get_unaligned_be16(&power->value) * 1000000ULL;
 446                 break;
 447         default:
 448                 return -EINVAL;
 449         }
 450
 451         return snprintf(buf, PAGE_SIZE - 1, "%llu\n", val);
 452 }
 453
 454 static ssize_t occ_show_power_a0(struct device *dev,
 455                                  struct device_attribute *attr, char *buf)
 456 {
 457         int rc;
 458         u64 val = 0;
 459         struct power_sensor_a0 *power;
 460         struct occ *occ = dev_get_drvdata(dev);
 461         struct occ_sensors *sensors = &occ->sensors;
 462         struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
 463
 464         rc = occ_update_response(occ);
 465         if (rc)
 466                 return rc;
 467
 468         power = ((struct power_sensor_a0 *)sensors->power.data) + sattr->index;
 469
 470         switch (sattr->nr) {
 471         case 0:
 472                 return snprintf(buf, PAGE_SIZE - 1, "%u_system\n",
 473                                 get_unaligned_be32(&power->sensor_id));
 474         case 1:
 475                 val = occ_get_powr_avg(&power->system.accumulator,
 476                                        &power->system.update_tag);
 477                 break;
 478         case 2:
 479                 val = (u64)get_unaligned_be32(&power->system.update_tag) *
 480                            occ->powr_sample_time_us;
 481                 break;
 482         case 3:
 483                 val = get_unaligned_be16(&power->system.value) * 1000000ULL;
 484                 break;
 485         case 4:
 486                 return snprintf(buf, PAGE_SIZE - 1, "%u_proc\n",
 487                                 get_unaligned_be32(&power->sensor_id));
 488         case 5:
 489                 val = occ_get_powr_avg(&power->proc.accumulator,
 490                                        &power->proc.update_tag);
 491                 break;
 492         case 6:
 493                 val = (u64)get_unaligned_be32(&power->proc.update_tag) *
 494                            occ->powr_sample_time_us;
 495                 break;
 496         case 7:
 497                 val = get_unaligned_be16(&power->proc.value) * 1000000ULL;
 498                 break;
 499         case 8:
 500                 return snprintf(buf, PAGE_SIZE - 1, "%u_vdd\n",
 501                                 get_unaligned_be32(&power->sensor_id));
 502         case 9:
 503                 val = occ_get_powr_avg(&power->vdd.accumulator,
 504                                        &power->vdd.update_tag);
 505                 break;
 506         case 10:
 507                 val = (u64)get_unaligned_be32(&power->vdd.update_tag) *
 508                            occ->powr_sample_time_us;
 509                 break;
 510         case 11:
 511                 val = get_unaligned_be16(&power->vdd.value) * 1000000ULL;
 512                 break;
 513         case 12:
 514                 return snprintf(buf, PAGE_SIZE - 1, "%u_vdn\n",
 515                                 get_unaligned_be32(&power->sensor_id));
 516         case 13:
 517                 val = occ_get_powr_avg(&power->vdn.accumulator,
 518                                        &power->vdn.update_tag);
 519                 break;
 520         case 14:
 521                 val = (u64)get_unaligned_be32(&power->vdn.update_tag) *
 522                            occ->powr_sample_time_us;
 523                 break;
 524         case 15:
 525                 val = get_unaligned_be16(&power->vdn.value) * 1000000ULL;
 526                 break;
 527         default:
 528                 return -EINVAL;
 529         }
 530
 531         return snprintf(buf, PAGE_SIZE - 1, "%llu\n", val);
 532 }
 533
 534 static ssize_t occ_show_caps_1_2(struct device *dev,
 535                                  struct device_attribute *attr, char *buf)
 536 {
 537         int rc;
 538         u64 val = 0;
 539         struct caps_sensor_2 *caps;
 540         struct occ *occ = dev_get_drvdata(dev);
 541         struct occ_sensors *sensors = &occ->sensors;
 542         struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
 543
 544         rc = occ_update_response(occ);
 545         if (rc)
 546                 return rc;
 547
 548         caps = ((struct caps_sensor_2 *)sensors->caps.data) + sattr->index;
 549
 550         switch (sattr->nr) {
 551         case 0:
 552                 return snprintf(buf, PAGE_SIZE - 1, "system\n");
 553         case 1:
 554                 val = get_unaligned_be16(&caps->cap) * 1000000ULL;
 555                 break;
 556         case 2:
 557                 val = get_unaligned_be16(&caps->system_power) * 1000000ULL;
 558                 break;
 559         case 3:
 560                 val = get_unaligned_be16(&caps->n_cap) * 1000000ULL;
 561                 break;
 562         case 4:
 563                 val = get_unaligned_be16(&caps->max) * 1000000ULL;
 564                 break;
 565         case 5:
 566                 val = get_unaligned_be16(&caps->min) * 1000000ULL;
 567                 break;
 568         case 6:
 569                 val = get_unaligned_be16(&caps->user) * 1000000ULL;
 570                 break;
 571         case 7:
 572                 if (occ->sensors.caps.version == 1)
 573                         return -EINVAL;
 574
 575                 val = caps->user_source;
 576                 break;
 577         default:
 578                 return -EINVAL;
 579         }
 580
 581         return snprintf(buf, PAGE_SIZE - 1, "%llu\n", val);
 582 }
 583
 584 static ssize_t occ_show_caps_3(struct device *dev,
 585                                struct device_attribute *attr, char *buf)
 586 {
 587         int rc;
 588         u64 val = 0;
 589         struct caps_sensor_3 *caps;
 590         struct occ *occ = dev_get_drvdata(dev);
 591         struct occ_sensors *sensors = &occ->sensors;
 592         struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
 593
 594         rc = occ_update_response(occ);
 595         if (rc)
 596                 return rc;
 597
 598         caps = ((struct caps_sensor_3 *)sensors->caps.data) + sattr->index;
 599
 600         switch (sattr->nr) {
 601         case 0:
 602                 return snprintf(buf, PAGE_SIZE - 1, "system\n");
 603         case 1:
 604                 val = get_unaligned_be16(&caps->cap) * 1000000ULL;
 605                 break;
 606         case 2:
 607                 val = get_unaligned_be16(&caps->system_power) * 1000000ULL;
 608                 break;
 609         case 3:
 610                 val = get_unaligned_be16(&caps->n_cap) * 1000000ULL;
 611                 break;
 612         case 4:
 613                 val = get_unaligned_be16(&caps->max) * 1000000ULL;
 614                 break;
 615         case 5:
 616                 val = get_unaligned_be16(&caps->hard_min) * 1000000ULL;
 617                 break;
 618         case 6:
 619                 val = get_unaligned_be16(&caps->user) * 1000000ULL;
 620                 break;
 621         case 7:
 622                 val = caps->user_source;
 623                 break;
 624         default:
 625                 return -EINVAL;
 626         }
 627
 628         return snprintf(buf, PAGE_SIZE - 1, "%llu\n", val);
 629 }
 630
 631 static ssize_t occ_store_caps_user(struct device *dev,
 632                                    struct device_attribute *attr,
 633                                    const char *buf, size_t count)
 634 {
 635         int rc;
 636         u16 user_power_cap;
 637         unsigned long long value;
 638         struct occ *occ = dev_get_drvdata(dev);
 639
 640         rc = kstrtoull(buf, 0, &value);
 641         if (rc)
 642                 return rc;
 643
 644         user_power_cap = div64_u64(value, 1000000ULL); /* microwatt to watt */
 645
 646         rc = occ_set_user_power_cap(occ, user_power_cap);
 647         if (rc)
 648                 return rc;
 649
 650         return count;
 651 }
 652
 653 static ssize_t occ_show_extended(struct device *dev,
 654                                  struct device_attribute *attr, char *buf)
 655 {
 656         int rc;
 657         struct extended_sensor *extn;
 658         struct occ *occ = dev_get_drvdata(dev);
 659         struct occ_sensors *sensors = &occ->sensors;
 660         struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
 661
 662         rc = occ_update_response(occ);
 663         if (rc)
 664                 return rc;
 665
 666         extn = ((struct extended_sensor *)sensors->extended.data) +
 667                 sattr->index;
 668
 669         switch (sattr->nr) {
 670         case 0:
 671                 if (extn->flags & EXTN_FLAG_SENSOR_ID)
 672                         rc = snprintf(buf, PAGE_SIZE - 1, "%u",
 673                                       get_unaligned_be32(&extn->sensor_id));
 674                 else
 675                         rc = snprintf(buf, PAGE_SIZE - 1, "%02x%02x%02x%02x\n",
 676                                       extn->name[0], extn->name[1],
 677                                       extn->name[2], extn->name[3]);
 678                 break;
 679         case 1:
 680                 rc = snprintf(buf, PAGE_SIZE - 1, "%02x\n", extn->flags);
 681                 break;
 682         case 2:
 683                 rc = snprintf(buf, PAGE_SIZE - 1, "%02x%02x%02x%02x%02x%02x\n",
 684                               extn->data[0], extn->data[1], extn->data[2],
 685                               extn->data[3], extn->data[4], extn->data[5]);
 686                 break;
 687         default:
 688                 return -EINVAL;
 689         }
 690
 691         return rc;
 692 }
 693
 694 /*
 695  * Some helper macros to make it easier to define an occ_attribute. Since these
 696  * are dynamically allocated, we shouldn't use the existing kernel macros which
 697  * stringify the name argument.
 698  */
 699 #define ATTR_OCC(_name, _mode, _show, _store) {                         \
 700         .attr   = {                                                     \
 701                 .name = _name,                                          \
 702                 .mode = VERIFY_OCTAL_PERMISSIONS(_mode),                \
 703         },                                                              \
 704         .show   = _show,                                                \
 705         .store  = _store,                                               \
 706 }
 707
 708 #define SENSOR_ATTR_OCC(_name, _mode, _show, _store, _nr, _index) {     \
 709         .dev_attr       = ATTR_OCC(_name, _mode, _show, _store),        \
 710         .index          = _index,                                       \
 711         .nr             = _nr,                                          \
 712 }
 713
 714 #define OCC_INIT_ATTR(_name, _mode, _show, _store, _nr, _index)         \
 715         ((struct sensor_device_attribute_2)                             \
 716                 SENSOR_ATTR_OCC(_name, _mode, _show, _store, _nr, _index))
 717
 718 /*
 719  * Allocate and instatiate sensor_device_attribute_2s. It's most efficient to
 720  * use our own instead of the built-in hwmon attribute types.
 721  */
 722 static int occ_setup_sensor_attrs(struct occ *occ)
 723 {
 724         unsigned int i, s, num_attrs = 0;
 725         struct device *dev = occ->bus_dev;
 726         struct occ_sensors *sensors = &occ->sensors;
 727         struct occ_attribute *attr;
 728         struct temp_sensor_2 *temp;
 729         ssize_t (*show_temp)(struct device *, struct device_attribute *,
 730                              char *) = occ_show_temp_1;
 731         ssize_t (*show_freq)(struct device *, struct device_attribute *,
 732                              char *) = occ_show_freq_1;
 733         ssize_t (*show_power)(struct device *, struct device_attribute *,
 734                               char *) = occ_show_power_1;
 735         ssize_t (*show_caps)(struct device *, struct device_attribute *,
 736                              char *) = occ_show_caps_1_2;
 737
 738         switch (sensors->temp.version) {
 739         case 1:
 740                 num_attrs += (sensors->temp.num_sensors * 2);
 741                 break;
 742         case 2:
 743                 num_attrs += (sensors->temp.num_sensors * 4);
 744                 show_temp = occ_show_temp_2;
 745                 break;
 746         default:
 747                 sensors->temp.num_sensors = 0;
 748         }
 749
 750         switch (sensors->freq.version) {
 751         case 2:
 752                 show_freq = occ_show_freq_2;
 753                 /* fall through */
 754         case 1:
 755                 num_attrs += (sensors->freq.num_sensors * 2);
 756                 break;
 757         default:
 758                 sensors->freq.num_sensors = 0;
 759         }
 760
 761         switch (sensors->power.version) {
 762         case 2:
 763                 show_power = occ_show_power_2;
 764                 /* fall through */
 765         case 1:
 766                 num_attrs += (sensors->power.num_sensors * 4);
 767                 break;
 768         case 0xA0:
 769                 num_attrs += (sensors->power.num_sensors * 16);
 770                 show_power = occ_show_power_a0;
 771                 break;
 772         default:
 773                 sensors->power.num_sensors = 0;
 774         }
 775
 776         switch (sensors->caps.version) {
 777         case 1:
 778                 num_attrs += (sensors->caps.num_sensors * 7);
 779                 break;
 780         case 3:
 781                 show_caps = occ_show_caps_3;
 782                 /* fall through */
 783         case 2:
 784                 num_attrs += (sensors->caps.num_sensors * 8);
 785                 break;
 786         default:
 787                 sensors->caps.num_sensors = 0;
 788         }
 789
 790         switch (sensors->extended.version) {
 791         case 1:
 792                 num_attrs += (sensors->extended.num_sensors * 3);
 793                 break;
 794         default:
 795                 sensors->extended.num_sensors = 0;
 796         }
 797
 798         occ->attrs = devm_kzalloc(dev, sizeof(*occ->attrs) * num_attrs,
 799                                   GFP_KERNEL);
 800         if (!occ->attrs)
 801                 return -ENOMEM;
 802
 803         /* null-terminated list */
 804         occ->group.attrs = devm_kzalloc(dev, sizeof(*occ->group.attrs) *
 805                                         num_attrs + 1, GFP_KERNEL);
 806         if (!occ->group.attrs)
 807                 return -ENOMEM;
 808
 809         attr = occ->attrs;
 810
 811         for (i = 0; i < sensors->temp.num_sensors; ++i) {
 812                 s = i + 1;
 813                 temp = ((struct temp_sensor_2 *)sensors->temp.data) + i;
 814
 815                 snprintf(attr->name, sizeof(attr->name), "temp%d_label", s);
 816                 attr->sensor = OCC_INIT_ATTR(attr->name, 0444, show_temp, NULL,
 817                                              0, i);
 818                 attr++;
 819
 820                 if (sensors->temp.version > 1 &&
 821                     temp->fru_type == OCC_FRU_TYPE_VRM) {
 822                         snprintf(attr->name, sizeof(attr->name),
 823                                  "temp%d_alarm", s);
 824                 } else {
 825                         snprintf(attr->name, sizeof(attr->name),
 826                                  "temp%d_input", s);
 827                 }
 828
 829                 attr->sensor = OCC_INIT_ATTR(attr->name, 0444, show_temp, NULL,
 830                                              1, i);
 831                 attr++;
 832
 833                 if (sensors->temp.version > 1) {
 834                         snprintf(attr->name, sizeof(attr->name),
 835                                  "temp%d_fru_type", s);
 836                         attr->sensor = OCC_INIT_ATTR(attr->name, 0444,
 837                                                      show_temp, NULL, 2, i);
 838                         attr++;
 839
 840                         snprintf(attr->name, sizeof(attr->name),
 841                                  "temp%d_fault", s);
 842                         attr->sensor = OCC_INIT_ATTR(attr->name, 0444,
 843                                                      show_temp, NULL, 3, i);
 844                         attr++;
 845                 }
 846         }
 847
 848         for (i = 0; i < sensors->freq.num_sensors; ++i) {
 849                 s = i + 1;
 850
 851                 snprintf(attr->name, sizeof(attr->name), "freq%d_label", s);
 852                 attr->sensor = OCC_INIT_ATTR(attr->name, 0444, show_freq, NULL,
 853                                              0, i);
 854                 attr++;
 855
 856                 snprintf(attr->name, sizeof(attr->name), "freq%d_input", s);
 857                 attr->sensor = OCC_INIT_ATTR(attr->name, 0444, show_freq, NULL,
 858                                              1, i);
 859                 attr++;
 860         }
 861
 862         if (sensors->power.version == 0xA0) {
 863                 /*
 864                  * Special case for many-attribute power sensor. Split it into
 865                  * a sensor number per power type, emulating several sensors.
 866                  */
 867                 for (i = 0; i < sensors->power.num_sensors; ++i) {
 868                         unsigned int j;
 869                         unsigned int nr = 0;
 870
 871                         s = (i * 4) + 1;
 872
 873                         for (j = 0; j < 4; ++j) {
 874                                 snprintf(attr->name, sizeof(attr->name),
 875                                          "power%d_label", s);
 876                                 attr->sensor = OCC_INIT_ATTR(attr->name, 0444,
 877                                                              show_power, NULL,
 878                                                              nr++, i);
 879                                 attr++;
 880
 881                                 snprintf(attr->name, sizeof(attr->name),
 882                                          "power%d_average", s);
 883                                 attr->sensor = OCC_INIT_ATTR(attr->name, 0444,
 884                                                              show_power, NULL,
 885                                                              nr++, i);
 886                                 attr++;
 887
 888                                 snprintf(attr->name, sizeof(attr->name),
 889                                          "power%d_average_interval", s);
 890                                 attr->sensor = OCC_INIT_ATTR(attr->name, 0444,
 891                                                              show_power, NULL,
 892                                                              nr++, i);
 893                                 attr++;
 894
 895                                 snprintf(attr->name, sizeof(attr->name),
 896                                          "power%d_input", s);
 897                                 attr->sensor = OCC_INIT_ATTR(attr->name, 0444,
 898                                                              show_power, NULL,
 899                                                              nr++, i);
 900                                 attr++;
 901
 902                                 s++;
 903                         }
 904                 }
 905
 906                 s = (sensors->power.num_sensors * 4) + 1;
 907         } else {
 908                 for (i = 0; i < sensors->power.num_sensors; ++i) {
 909                         s = i + 1;
 910
 911                         snprintf(attr->name, sizeof(attr->name),
 912                                  "power%d_label", s);
 913                         attr->sensor = OCC_INIT_ATTR(attr->name, 0444,
 914                                                      show_power, NULL, 0, i);
 915                         attr++;
 916
 917                         snprintf(attr->name, sizeof(attr->name),
 918                                  "power%d_average", s);
 919                         attr->sensor = OCC_INIT_ATTR(attr->name, 0444,
 920                                                      show_power, NULL, 1, i);
 921                         attr++;
 922
 923                         snprintf(attr->name, sizeof(attr->name),
 924                                  "power%d_average_interval", s);
 925                         attr->sensor = OCC_INIT_ATTR(attr->name, 0444,
 926                                                      show_power, NULL, 2, i);
 927                         attr++;
 928
 929                         snprintf(attr->name, sizeof(attr->name),
 930                                  "power%d_input", s);
 931                         attr->sensor = OCC_INIT_ATTR(attr->name, 0444,
 932                                                      show_power, NULL, 3, i);
 933                         attr++;
 934                 }
 935
 936                 s = sensors->power.num_sensors + 1;
 937         }
 938
 939         if (sensors->caps.num_sensors >= 1) {
 940                 snprintf(attr->name, sizeof(attr->name), "power%d_label", s);
 941                 attr->sensor = OCC_INIT_ATTR(attr->name, 0444, show_caps, NULL,
 942                                              0, 0);
 943                 attr++;
 944
 945                 snprintf(attr->name, sizeof(attr->name), "power%d_cap", s);
 946                 attr->sensor = OCC_INIT_ATTR(attr->name, 0444, show_caps, NULL,
 947                                              1, 0);
 948                 attr++;
 949
 950                 snprintf(attr->name, sizeof(attr->name), "power%d_input", s);
 951                 attr->sensor = OCC_INIT_ATTR(attr->name, 0444, show_caps, NULL,
 952                                              2, 0);
 953                 attr++;
 954
 955                 snprintf(attr->name, sizeof(attr->name),
 956                          "power%d_cap_not_redundant", s);
 957                 attr->sensor = OCC_INIT_ATTR(attr->name, 0444, show_caps, NULL,
 958                                              3, 0);
 959                 attr++;
 960
 961                 snprintf(attr->name, sizeof(attr->name), "power%d_cap_max", s);
 962                 attr->sensor = OCC_INIT_ATTR(attr->name, 0444, show_caps, NULL,
 963                                              4, 0);
 964                 attr++;
 965
 966                 snprintf(attr->name, sizeof(attr->name), "power%d_cap_min", s);
 967                 attr->sensor = OCC_INIT_ATTR(attr->name, 0444, show_caps, NULL,
 968                                              5, 0);
 969                 attr++;
 970
 971                 snprintf(attr->name, sizeof(attr->name), "power%d_cap_user",
 972                          s);
 973                 attr->sensor = OCC_INIT_ATTR(attr->name, 0644, show_caps,
 974                                              occ_store_caps_user, 6, 0);
 975                 attr++;
 976
 977                 if (sensors->caps.version > 1) {
 978                         snprintf(attr->name, sizeof(attr->name),
 979                                  "power%d_cap_user_source", s);
 980                         attr->sensor = OCC_INIT_ATTR(attr->name, 0444,
 981                                                      show_caps, NULL, 7, 0);
 982                         attr++;
 983                 }
 984         }
 985
 986         for (i = 0; i < sensors->extended.num_sensors; ++i) {
 987                 s = i + 1;
 988
 989                 snprintf(attr->name, sizeof(attr->name), "extn%d_label", s);
 990                 attr->sensor = OCC_INIT_ATTR(attr->name, 0444,
 991                                              occ_show_extended, NULL, 0, i);
 992                 attr++;
 993
 994                 snprintf(attr->name, sizeof(attr->name), "extn%d_flags", s);
 995                 attr->sensor = OCC_INIT_ATTR(attr->name, 0444,
 996                                              occ_show_extended, NULL, 1, i);
 997                 attr++;
 998
 999                 snprintf(attr->name, sizeof(attr->name), "extn%d_input", s);
1000                 attr->sensor = OCC_INIT_ATTR(attr->name, 0444,
1001                                              occ_show_extended, NULL, 2, i);
1002                 attr++;
1003         }
1004
1005         /* put the sensors in the group */
1006         for (i = 0; i < num_attrs; ++i) {
1007                 sysfs_attr_init(&occ->attrs[i].sensor.dev_attr.attr);
1008                 occ->group.attrs[i] = &occ->attrs[i].sensor.dev_attr.attr;
1009         }
1010
1011         return 0;
1012 }
1013
1014 /* only need to do this once at startup, as OCC won't change sensors on us */
1015 static void occ_parse_poll_response(struct occ *occ)
1016 {
1017         unsigned int i, old_offset, offset = 0, size = 0;
1018         struct occ_sensor *sensor;
1019         struct occ_sensors *sensors = &occ->sensors;
1020         struct occ_response *resp = &occ->resp;
1021         struct occ_poll_response *poll =
1022                 (struct occ_poll_response *)&resp->data[0];
1023         struct occ_poll_response_header *header = &poll->header;
1024         struct occ_sensor_data_block *block = &poll->block;
1025
1026         dev_info(occ->bus_dev, "OCC found, code level: %.16s\n",
1027                  header->occ_code_level);
1028
1029         for (i = 0; i < header->num_sensor_data_blocks; ++i) {
1030                 block = (struct occ_sensor_data_block *)((u8 *)block + offset);
1031                 old_offset = offset;
1032                 offset = (block->header.num_sensors *
1033                           block->header.sensor_length) + sizeof(block->header);
1034                 size += offset;
1035
1036                 /* validate all the length/size fields */
1037                 if ((size + sizeof(*header)) >= OCC_RESP_DATA_BYTES) {
1038                         dev_warn(occ->bus_dev, "exceeded response buffer\n");
1039                         return;
1040                 }
1041
1042                 dev_dbg(occ->bus_dev, " %04x..%04x: %.4s (%d sensors)\n",
1043                         old_offset, offset - 1, block->header.eye_catcher,
1044                         block->header.num_sensors);
1045
1046                 /* match sensor block type */
1047                 if (strncmp(block->header.eye_catcher, "TEMP", 4) == 0)
1048                         sensor = &sensors->temp;
1049                 else if (strncmp(block->header.eye_catcher, "FREQ", 4) == 0)
1050                         sensor = &sensors->freq;
1051                 else if (strncmp(block->header.eye_catcher, "POWR", 4) == 0)
1052                         sensor = &sensors->power;
1053                 else if (strncmp(block->header.eye_catcher, "CAPS", 4) == 0)
1054                         sensor = &sensors->caps;
1055                 else if (strncmp(block->header.eye_catcher, "EXTN", 4) == 0)
1056                         sensor = &sensors->extended;
1057                 else {
1058                         dev_warn(occ->bus_dev, "sensor not supported %.4s\n",
1059                                  block->header.eye_catcher);
1060                         continue;
1061                 }
1062
1063                 sensor->num_sensors = block->header.num_sensors;
1064                 sensor->version = block->header.sensor_format;
1065                 sensor->data = &block->data;
1066         }
1067
1068         dev_dbg(occ->bus_dev, "Max resp size: %u+%zd=%zd\n", size,
1069                 sizeof(*header), size + sizeof(*header));
1070 }
1071
1072 int occ_setup(struct occ *occ, const char *name)
1073 {
1074         int rc;
1075
1076         mutex_init(&occ->lock);
1077         occ->groups[0] = &occ->group;
1078
1079         /* no need to lock */
1080         rc = occ_poll(occ);
1081         if (rc == -ESHUTDOWN) {
1082                 dev_info(occ->bus_dev, "host is not ready\n");
1083                 return rc;
1084         } else if (rc < 0) {
1085                 dev_err(occ->bus_dev, "failed to get OCC poll response: %d\n",
1086                         rc);
1087                 return rc;
1088         }
1089
1090         occ_parse_poll_response(occ);
1091
1092         rc = occ_setup_sensor_attrs(occ);
1093         if (rc) {
1094                 dev_err(occ->bus_dev, "failed to setup sensor attrs: %d\n",
1095                         rc);
1096                 return rc;
1097         }
1098
1099         occ->hwmon = devm_hwmon_device_register_with_groups(occ->bus_dev, name,
1100                                                             occ, occ->groups);
1101         if (IS_ERR(occ->hwmon)) {
1102                 rc = PTR_ERR(occ->hwmon);
1103                 dev_err(occ->bus_dev, "failed to register hwmon device: %d\n",
1104                         rc);
1105                 return rc;
1106         }
1107
1108         rc = occ_setup_sysfs(occ);
1109         if (rc)
1110                 dev_err(occ->bus_dev, "failed to setup sysfs: %d\n", rc);
1111
1112         return rc;
1113 }
1114 EXPORT_SYMBOL_GPL(occ_setup);
1115
1116 MODULE_AUTHOR("Eddie James <eajames@linux.ibm.com>");
1117 MODULE_DESCRIPTION("Common OCC hwmon code");
1118 MODULE_LICENSE("GPL");