hw/sensor/max31785.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Maxim MAX31785 PMBus 6-Channel Fan Controller
   4  *
   5  * Datasheet:
   6  * https://datasheets.maximintegrated.com/en/ds/MAX31785.pdf
   7  *
   8  * Copyright(c) 2022 Qualcomm Innovation Center, Inc. All rights reserved.
   9  */
  10
  11 #include "qemu/osdep.h"
  12 #include "hw/i2c/pmbus_device.h"
  13 #include "hw/irq.h"
  14 #include "migration/vmstate.h"
  15 #include "qapi/error.h"
  16 #include "qapi/visitor.h"
  17 #include "qemu/log.h"
  18 #include "qemu/module.h"
  19
  20 #define TYPE_MAX31785 "max31785"
  21 #define MAX31785(obj) OBJECT_CHECK(MAX31785State, (obj), TYPE_MAX31785)
  22
  23 /* MAX31785 mfr specific PMBus commands */
  24 #define MAX31785_MFR_MODE               0xD1
  25 #define MAX31785_MFR_PSEN_CONFIG        0xD2
  26 #define MAX31785_MFR_VOUT_PEAK          0xD4
  27 #define MAX31785_MFR_TEMPERATURE_PEAK   0xD6
  28 #define MAX31785_MFR_VOUT_MIN           0xD7
  29 #define MAX31785_MFR_FAULT_RESPONSE     0xD9
  30 #define MAX31785_MFR_NV_FAULT_LOG       0xDC
  31 #define MAX31785_MFR_TIME_COUNT         0xDD
  32 #define MAX31785_MFR_TEMP_SENSOR_CONFIG 0xF0
  33 #define MAX31785_MFR_FAN_CONFIG         0xF1
  34 #define MAX31785_MFR_FAN_LUT            0xF2
  35 #define MAX31785_MFR_READ_FAN_PWM       0xF3
  36 #define MAX31785_MFR_FAN_FAULT_LIMIT    0xF5
  37 #define MAX31785_MFR_FAN_WARN_LIMIT     0xF6
  38 #define MAX31785_MFR_FAN_RUN_TIME       0xF7
  39 #define MAX31785_MFR_FAN_PWM_AVG        0xF8
  40 #define MAX31785_MFR_FAN_PWM2RPM        0xF9
  41
  42 /* defaults as per the data sheet */
  43 #define MAX31785_DEFAULT_CAPABILITY            0x10
  44 #define MAX31785_DEFAULT_VOUT_MODE             0x40
  45 #define MAX31785_DEFAULT_VOUT_SCALE_MONITOR    0x7FFF
  46 #define MAX31785_DEFAULT_FAN_COMMAND_1         0x7FFF
  47 #define MAX31785_DEFAULT_OV_FAULT_LIMIT        0x7FFF
  48 #define MAX31785_DEFAULT_OV_WARN_LIMIT         0x7FFF
  49 #define MAX31785_DEFAULT_OT_FAULT_LIMIT        0x7FFF
  50 #define MAX31785_DEFAULT_OT_WARN_LIMIT         0x7FFF
  51 #define MAX31785_DEFAULT_PMBUS_REVISION        0x11
  52 #define MAX31785_DEFAULT_MFR_ID                0x4D
  53 #define MAX31785_DEFAULT_MFR_MODEL             0x53
  54 #define MAX31785_DEFAULT_MFR_REVISION          0x3030
  55 #define MAX31785A_DEFAULT_MFR_REVISION         0x3040
  56 #define MAX31785B_DEFAULT_MFR_REVISION         0x3061
  57 #define MAX31785B_DEFAULT_MFR_TEMPERATURE_PEAK 0x8000
  58 #define MAX31785B_DEFAULT_MFR_VOUT_MIN         0x7FFF
  59 #define MAX31785_DEFAULT_TEXT                  0x3130313031303130
  60
  61 /* MAX31785 pages */
  62 #define MAX31785_TOTAL_NUM_PAGES      23
  63 #define MAX31785_FAN_PAGES            6
  64 #define MAX31785_MIN_FAN_PAGE         0
  65 #define MAX31785_MAX_FAN_PAGE         5
  66 #define MAX31785_MIN_TEMP_PAGE        6
  67 #define MAX31785_MAX_TEMP_PAGE        16
  68 #define MAX31785_MIN_ADC_VOLTAGE_PAGE 17
  69 #define MAX31785_MAX_ADC_VOLTAGE_PAGE 22
  70
  71 /* FAN_CONFIG_1_2 */
  72 #define MAX31785_MFR_FAN_CONFIG                0xF1
  73 #define MAX31785_FAN_CONFIG_ENABLE             BIT(7)
  74 #define MAX31785_FAN_CONFIG_RPM_PWM            BIT(6)
  75 #define MAX31785_FAN_CONFIG_PULSE(pulse)       (pulse << 4)
  76 #define MAX31785_DEFAULT_FAN_CONFIG_1_2(pulse)                                 \
  77     (MAX31785_FAN_CONFIG_ENABLE | MAX31785_FAN_CONFIG_PULSE(pulse))
  78 #define MAX31785_DEFAULT_MFR_FAN_CONFIG        0x0000
  79
  80 /* fan speed in RPM */
  81 #define MAX31785_DEFAULT_FAN_SPEED   0x7fff
  82 #define MAX31785_DEFAULT_FAN_STATUS  0x00
  83
  84 #define MAX31785_DEFAULT_FAN_MAX_PWM 0x2710
  85
  86 /*
  87  * MAX31785State:
  88  * @code: The command code received
  89  * @page: Each page corresponds to a device monitored by the Max 31785
  90  * The page register determines the available commands depending on device
  91  * _____________________________________________________________________________
  92  * |   0   |  Fan Connected to PWM0                                            |
  93  * |_______|___________________________________________________________________|
  94  * |   1   |  Fan Connected to PWM1                                            |
  95  * |_______|___________________________________________________________________|
  96  * |   2   |  Fan Connected to PWM2                                            |
  97  * |_______|___________________________________________________________________|
  98  * |   3   |  Fan Connected to PWM3                                            |
  99  * |_______|___________________________________________________________________|
 100  * |   4   |  Fan Connected to PWM4                                            |
 101  * |_______|___________________________________________________________________|
 102  * |   5   |  Fan Connected to PWM5                                            |
 103  * |_______|___________________________________________________________________|
 104  * |   6   |  Remote Thermal Diode Connected to ADC 0                          |
 105  * |_______|___________________________________________________________________|
 106  * |   7   |  Remote Thermal Diode Connected to ADC 1                          |
 107  * |_______|___________________________________________________________________|
 108  * |   8   |  Remote Thermal Diode Connected to ADC 2                          |
 109  * |_______|___________________________________________________________________|
 110  * |   9   |  Remote Thermal Diode Connected to ADC 3                          |
 111  * |_______|___________________________________________________________________|
 112  * |  10   |  Remote Thermal Diode Connected to ADC 4                          |
 113  * |_______|___________________________________________________________________|
 114  * |  11   |  Remote Thermal Diode Connected to ADC 5                          |
 115  * |_______|___________________________________________________________________|
 116  * |  12   |  Internal Temperature Sensor                                      |
 117  * |_______|___________________________________________________________________|
 118  * |  13   |  Remote I2C Temperature Sensor with Address 0                     |
 119  * |_______|___________________________________________________________________|
 120  * |  14   |  Remote I2C Temperature Sensor with Address 1                     |
 121  * |_______|___________________________________________________________________|
 122  * |  15   |  Remote I2C Temperature Sensor with Address 2                     |
 123  * |_______|___________________________________________________________________|
 124  * |  16   |  Remote I2C Temperature Sensor with Address 3                     |
 125  * |_______|___________________________________________________________________|
 126  * |  17   |  Remote I2C Temperature Sensor with Address 4                     |
 127  * |_______|___________________________________________________________________|
 128  * |  17   |  Remote Voltage Connected to ADC0                                 |
 129  * |_______|___________________________________________________________________|
 130  * |  18   |  Remote Voltage Connected to ADC1                                 |
 131  * |_______|___________________________________________________________________|
 132  * |  19   |  Remote Voltage Connected to ADC2                                 |
 133  * |_______|___________________________________________________________________|
 134  * |  20   |  Remote Voltage Connected to ADC3                                 |
 135  * |_______|___________________________________________________________________|
 136  * |  21   |  Remote Voltage Connected to ADC4                                 |
 137  * |_______|___________________________________________________________________|
 138  * |  22   |  Remote Voltage Connected to ADC5                                 |
 139  * |_______|___________________________________________________________________|
 140  * |23-254 |  Reserved                                                         |
 141  * |_______|___________________________________________________________________|
 142  * |  255  |  Applies to all pages                                             |
 143  * |_______|___________________________________________________________________|
 144  */
 145
 146 /* Place holder to save the max31785 mfr specific registers */
 147 typedef struct MAX31785State {
 148     PMBusDevice parent;
 149     uint16_t mfr_mode[MAX31785_TOTAL_NUM_PAGES];
 150     uint16_t vout_peak[MAX31785_TOTAL_NUM_PAGES];
 151     uint16_t temperature_peak[MAX31785_TOTAL_NUM_PAGES];
 152     uint16_t vout_min[MAX31785_TOTAL_NUM_PAGES];
 153     uint8_t  fault_response[MAX31785_TOTAL_NUM_PAGES];
 154     uint32_t time_count[MAX31785_TOTAL_NUM_PAGES];
 155     uint16_t temp_sensor_config[MAX31785_TOTAL_NUM_PAGES];
 156     uint16_t fan_config[MAX31785_TOTAL_NUM_PAGES];
 157     uint16_t read_fan_pwm[MAX31785_TOTAL_NUM_PAGES];
 158     uint16_t fan_fault_limit[MAX31785_TOTAL_NUM_PAGES];
 159     uint16_t fan_warn_limit[MAX31785_TOTAL_NUM_PAGES];
 160     uint16_t fan_run_time[MAX31785_TOTAL_NUM_PAGES];
 161     uint16_t fan_pwm_avg[MAX31785_TOTAL_NUM_PAGES];
 162     uint64_t fan_pwm2rpm[MAX31785_TOTAL_NUM_PAGES];
 163     uint64_t mfr_location;
 164     uint64_t mfr_date;
 165     uint64_t mfr_serial;
 166     uint16_t mfr_revision;
 167 } MAX31785State;
 168
 169 static uint8_t max31785_read_byte(PMBusDevice *pmdev)
 170 {
 171     MAX31785State *s = MAX31785(pmdev);
 172     switch (pmdev->code) {
 173
 174     case PMBUS_FAN_CONFIG_1_2:
 175         if (pmdev->page <= MAX31785_MAX_FAN_PAGE) {
 176             pmbus_send8(pmdev, pmdev->pages[pmdev->page].fan_config_1_2);
 177         }
 178         break;
 179
 180     case PMBUS_FAN_COMMAND_1:
 181         if (pmdev->page <= MAX31785_MAX_FAN_PAGE) {
 182             pmbus_send16(pmdev, pmdev->pages[pmdev->page].fan_command_1);
 183         }
 184         break;
 185
 186     case PMBUS_READ_FAN_SPEED_1:
 187         if (pmdev->page <= MAX31785_MAX_FAN_PAGE) {
 188             pmbus_send16(pmdev, pmdev->pages[pmdev->page].read_fan_speed_1);
 189         }
 190         break;
 191
 192     case PMBUS_STATUS_FANS_1_2:
 193         if (pmdev->page <= MAX31785_MAX_FAN_PAGE) {
 194             pmbus_send16(pmdev, pmdev->pages[pmdev->page].status_fans_1_2);
 195         }
 196         break;
 197
 198     case PMBUS_MFR_REVISION:
 199         pmbus_send16(pmdev, MAX31785_DEFAULT_MFR_REVISION);
 200         break;
 201
 202     case PMBUS_MFR_ID:
 203         pmbus_send8(pmdev, 0x4d); /* Maxim */
 204         break;
 205
 206     case PMBUS_MFR_MODEL:
 207         pmbus_send8(pmdev, 0x53);
 208         break;
 209
 210     case PMBUS_MFR_LOCATION:
 211         pmbus_send64(pmdev, s->mfr_location);
 212         break;
 213
 214     case PMBUS_MFR_DATE:
 215         pmbus_send64(pmdev, s->mfr_date);
 216         break;
 217
 218     case PMBUS_MFR_SERIAL:
 219         pmbus_send64(pmdev, s->mfr_serial);
 220         break;
 221
 222     case MAX31785_MFR_MODE:
 223         pmbus_send16(pmdev, s->mfr_mode[pmdev->page]);
 224         break;
 225
 226     case MAX31785_MFR_VOUT_PEAK:
 227         if ((pmdev->page >= MAX31785_MIN_ADC_VOLTAGE_PAGE) &&
 228             (pmdev->page <= MAX31785_MAX_ADC_VOLTAGE_PAGE)) {
 229             pmbus_send16(pmdev, s->vout_peak[pmdev->page]);
 230         }
 231         break;
 232
 233     case MAX31785_MFR_TEMPERATURE_PEAK:
 234         if ((pmdev->page >= MAX31785_MIN_TEMP_PAGE) &&
 235             (pmdev->page <= MAX31785_MAX_TEMP_PAGE)) {
 236             pmbus_send16(pmdev, s->temperature_peak[pmdev->page]);
 237         }
 238         break;
 239
 240     case MAX31785_MFR_VOUT_MIN:
 241         if ((pmdev->page >= MAX31785_MIN_ADC_VOLTAGE_PAGE) &&
 242             (pmdev->page <= MAX31785_MAX_ADC_VOLTAGE_PAGE)) {
 243             pmbus_send16(pmdev, s->vout_min[pmdev->page]);
 244         }
 245         break;
 246
 247     case MAX31785_MFR_FAULT_RESPONSE:
 248         pmbus_send8(pmdev, s->fault_response[pmdev->page]);
 249         break;
 250
 251     case MAX31785_MFR_TIME_COUNT: /* R/W 32 */
 252         pmbus_send32(pmdev, s->time_count[pmdev->page]);
 253         break;
 254
 255     case MAX31785_MFR_TEMP_SENSOR_CONFIG: /* R/W 16 */
 256         if ((pmdev->page >= MAX31785_MIN_TEMP_PAGE) &&
 257             (pmdev->page <= MAX31785_MAX_TEMP_PAGE)) {
 258             pmbus_send16(pmdev, s->temp_sensor_config[pmdev->page]);
 259         }
 260         break;
 261
 262     case MAX31785_MFR_FAN_CONFIG: /* R/W 16 */
 263         if (pmdev->page <= MAX31785_MAX_FAN_PAGE) {
 264             pmbus_send16(pmdev, s->fan_config[pmdev->page]);
 265         }
 266         break;
 267
 268     case MAX31785_MFR_READ_FAN_PWM: /* R/W 16 */
 269         if (pmdev->page <= MAX31785_MAX_FAN_PAGE) {
 270             pmbus_send16(pmdev, s->read_fan_pwm[pmdev->page]);
 271         }
 272         break;
 273
 274     case MAX31785_MFR_FAN_FAULT_LIMIT: /* R/W 16 */
 275         if (pmdev->page <= MAX31785_MAX_FAN_PAGE) {
 276             pmbus_send16(pmdev, s->fan_fault_limit[pmdev->page]);
 277         }
 278         break;
 279
 280     case MAX31785_MFR_FAN_WARN_LIMIT: /* R/W 16 */
 281         if (pmdev->page <= MAX31785_MAX_FAN_PAGE) {
 282             pmbus_send16(pmdev, s->fan_warn_limit[pmdev->page]);
 283         }
 284         break;
 285
 286     case MAX31785_MFR_FAN_RUN_TIME: /* R/W 16 */
 287         if (pmdev->page <= MAX31785_MAX_FAN_PAGE) {
 288             pmbus_send16(pmdev, s->fan_run_time[pmdev->page]);
 289         }
 290         break;
 291
 292     case MAX31785_MFR_FAN_PWM_AVG: /* R/W 16 */
 293         if (pmdev->page <= MAX31785_MAX_FAN_PAGE) {
 294             pmbus_send16(pmdev, s->fan_pwm_avg[pmdev->page]);
 295         }
 296         break;
 297
 298     case MAX31785_MFR_FAN_PWM2RPM: /* R/W 64 */
 299         if (pmdev->page <= MAX31785_MAX_FAN_PAGE) {
 300             pmbus_send64(pmdev, s->fan_pwm2rpm[pmdev->page]);
 301         }
 302         break;
 303
 304     default:
 305         qemu_log_mask(LOG_GUEST_ERROR,
 306         "%s: reading from unsupported register: 0x%02x\n",
 307         __func__, pmdev->code);
 308         break;
 309     }
 310
 311     return 0xFF;
 312 }
 313
 314 static int max31785_write_data(PMBusDevice *pmdev, const uint8_t *buf,
 315                                uint8_t len)
 316 {
 317     MAX31785State *s = MAX31785(pmdev);
 318     if (len == 0) {
 319         qemu_log_mask(LOG_GUEST_ERROR, "%s: writing empty data\n", __func__);
 320         return -1;
 321     }
 322
 323     pmdev->code = buf[0]; /* PMBus command code */
 324
 325     if (len == 1) {
 326         return 0;
 327     }
 328
 329     /* Exclude command code from buffer */
 330     buf++;
 331     len--;
 332
 333     switch (pmdev->code) {
 334
 335     case PMBUS_FAN_CONFIG_1_2:
 336         if (pmdev->page <= MAX31785_MAX_FAN_PAGE) {
 337             pmdev->pages[pmdev->page].fan_config_1_2 = pmbus_receive8(pmdev);
 338         }
 339         break;
 340
 341     case PMBUS_FAN_COMMAND_1:
 342         if (pmdev->page <= MAX31785_MAX_FAN_PAGE) {
 343             pmdev->pages[pmdev->page].fan_command_1 = pmbus_receive16(pmdev);
 344             pmdev->pages[pmdev->page].read_fan_speed_1 =
 345                 ((MAX31785_DEFAULT_FAN_SPEED / MAX31785_DEFAULT_FAN_MAX_PWM) *
 346                 pmdev->pages[pmdev->page].fan_command_1);
 347         }
 348         break;
 349
 350     case PMBUS_MFR_LOCATION: /* R/W 64 */
 351         s->mfr_location = pmbus_receive64(pmdev);
 352         break;
 353
 354     case PMBUS_MFR_DATE: /* R/W 64 */
 355         s->mfr_date = pmbus_receive64(pmdev);
 356         break;
 357
 358     case PMBUS_MFR_SERIAL: /* R/W 64 */
 359         s->mfr_serial = pmbus_receive64(pmdev);
 360         break;
 361
 362     case MAX31785_MFR_MODE: /* R/W word */
 363         s->mfr_mode[pmdev->page] = pmbus_receive16(pmdev);
 364         break;
 365
 366     case MAX31785_MFR_VOUT_PEAK: /* R/W word */
 367         if ((pmdev->page >= MAX31785_MIN_ADC_VOLTAGE_PAGE) &&
 368             (pmdev->page <= MAX31785_MAX_ADC_VOLTAGE_PAGE)) {
 369             s->vout_peak[pmdev->page] = pmbus_receive16(pmdev);
 370         }
 371         break;
 372
 373     case MAX31785_MFR_TEMPERATURE_PEAK: /* R/W word */
 374         if ((pmdev->page >= 6) && (pmdev->page <= 16)) {
 375             s->temperature_peak[pmdev->page] = pmbus_receive16(pmdev);
 376         }
 377         break;
 378
 379     case MAX31785_MFR_VOUT_MIN: /* R/W word */
 380         if ((pmdev->page >= MAX31785_MIN_ADC_VOLTAGE_PAGE) &&
 381             (pmdev->page <= MAX31785_MAX_ADC_VOLTAGE_PAGE)) {
 382             s->vout_min[pmdev->page] = pmbus_receive16(pmdev);
 383         }
 384         break;
 385
 386     case MAX31785_MFR_FAULT_RESPONSE: /* R/W 8 */
 387         s->fault_response[pmdev->page] = pmbus_receive8(pmdev);
 388         break;
 389
 390     case MAX31785_MFR_TIME_COUNT: /* R/W 32 */
 391         s->time_count[pmdev->page] = pmbus_receive32(pmdev);
 392         break;
 393
 394     case MAX31785_MFR_TEMP_SENSOR_CONFIG: /* R/W 16 */
 395         if ((pmdev->page >= MAX31785_MIN_TEMP_PAGE) &&
 396             (pmdev->page <= MAX31785_MAX_TEMP_PAGE)) {
 397             s->temp_sensor_config[pmdev->page] = pmbus_receive16(pmdev);
 398         }
 399         break;
 400
 401     case MAX31785_MFR_FAN_CONFIG: /* R/W 16 */
 402         if (pmdev->page <= MAX31785_MAX_FAN_PAGE) {
 403             s->fan_config[pmdev->page] = pmbus_receive16(pmdev);
 404         }
 405         break;
 406
 407     case MAX31785_MFR_FAN_FAULT_LIMIT: /* R/W 16 */
 408         if (pmdev->page <= MAX31785_MAX_FAN_PAGE) {
 409             s->fan_fault_limit[pmdev->page] = pmbus_receive16(pmdev);
 410         }
 411         break;
 412
 413     case MAX31785_MFR_FAN_WARN_LIMIT: /* R/W 16 */
 414         if (pmdev->page <= MAX31785_MAX_FAN_PAGE) {
 415             s->fan_warn_limit[pmdev->page] = pmbus_receive16(pmdev);
 416         }
 417         break;
 418
 419     case MAX31785_MFR_FAN_RUN_TIME: /* R/W 16 */
 420         if (pmdev->page <= MAX31785_MAX_FAN_PAGE) {
 421             s->fan_run_time[pmdev->page] = pmbus_receive16(pmdev);
 422         }
 423         break;
 424
 425     case MAX31785_MFR_FAN_PWM_AVG: /* R/W 16 */
 426         if (pmdev->page <= MAX31785_MAX_FAN_PAGE) {
 427             s->fan_pwm_avg[pmdev->page] = pmbus_receive16(pmdev);
 428         }
 429         break;
 430
 431     case MAX31785_MFR_FAN_PWM2RPM: /* R/W 64 */
 432         if (pmdev->page <= MAX31785_MAX_FAN_PAGE) {
 433             s->fan_pwm2rpm[pmdev->page] = pmbus_receive64(pmdev);
 434         }
 435         break;
 436
 437     default:
 438         qemu_log_mask(LOG_GUEST_ERROR,
 439                       "%s: writing to unsupported register: 0x%02x\n",
 440                       __func__, pmdev->code);
 441         break;
 442     }
 443
 444     return 0;
 445 }
 446
 447 static void max31785_exit_reset(Object *obj)
 448 {
 449     PMBusDevice *pmdev = PMBUS_DEVICE(obj);
 450     MAX31785State *s = MAX31785(obj);
 451
 452     pmdev->capability = MAX31785_DEFAULT_CAPABILITY;
 453
 454     for (int i = MAX31785_MIN_FAN_PAGE; i <= MAX31785_MAX_FAN_PAGE; i++) {
 455         pmdev->pages[i].vout_mode = MAX31785_DEFAULT_VOUT_MODE;
 456         pmdev->pages[i].fan_command_1 = MAX31785_DEFAULT_FAN_COMMAND_1;
 457         pmdev->pages[i].revision = MAX31785_DEFAULT_PMBUS_REVISION;
 458         pmdev->pages[i].fan_config_1_2 = MAX31785_DEFAULT_FAN_CONFIG_1_2(0);
 459         pmdev->pages[i].read_fan_speed_1 = MAX31785_DEFAULT_FAN_SPEED;
 460         pmdev->pages[i].status_fans_1_2 = MAX31785_DEFAULT_FAN_STATUS;
 461     }
 462
 463     for (int i = MAX31785_MIN_TEMP_PAGE; i <= MAX31785_MAX_TEMP_PAGE; i++) {
 464         pmdev->pages[i].vout_mode = MAX31785_DEFAULT_VOUT_MODE;
 465         pmdev->pages[i].revision = MAX31785_DEFAULT_PMBUS_REVISION;
 466         pmdev->pages[i].ot_fault_limit = MAX31785_DEFAULT_OT_FAULT_LIMIT;
 467         pmdev->pages[i].ot_warn_limit = MAX31785_DEFAULT_OT_WARN_LIMIT;
 468     }
 469
 470     for (int i = MAX31785_MIN_ADC_VOLTAGE_PAGE;
 471          i <= MAX31785_MAX_ADC_VOLTAGE_PAGE;
 472          i++) {
 473         pmdev->pages[i].vout_mode = MAX31785_DEFAULT_VOUT_MODE;
 474         pmdev->pages[i].revision = MAX31785_DEFAULT_PMBUS_REVISION;
 475         pmdev->pages[i].vout_scale_monitor =
 476             MAX31785_DEFAULT_VOUT_SCALE_MONITOR;
 477         pmdev->pages[i].vout_ov_fault_limit = MAX31785_DEFAULT_OV_FAULT_LIMIT;
 478         pmdev->pages[i].vout_ov_warn_limit = MAX31785_DEFAULT_OV_WARN_LIMIT;
 479     }
 480
 481     s->mfr_location = MAX31785_DEFAULT_TEXT;
 482     s->mfr_date = MAX31785_DEFAULT_TEXT;
 483     s->mfr_serial = MAX31785_DEFAULT_TEXT;
 484 }
 485
 486 static const VMStateDescription vmstate_max31785 = {
 487     .name = TYPE_MAX31785,
 488     .version_id = 0,
 489     .minimum_version_id = 0,
 490     .fields = (VMStateField[]){
 491         VMSTATE_PMBUS_DEVICE(parent, MAX31785State),
 492         VMSTATE_UINT16_ARRAY(mfr_mode, MAX31785State,
 493                              MAX31785_TOTAL_NUM_PAGES),
 494         VMSTATE_UINT16_ARRAY(vout_peak, MAX31785State,
 495                              MAX31785_TOTAL_NUM_PAGES),
 496         VMSTATE_UINT16_ARRAY(temperature_peak, MAX31785State,
 497                              MAX31785_TOTAL_NUM_PAGES),
 498         VMSTATE_UINT16_ARRAY(vout_min, MAX31785State,
 499                              MAX31785_TOTAL_NUM_PAGES),
 500         VMSTATE_UINT8_ARRAY(fault_response, MAX31785State,
 501                             MAX31785_TOTAL_NUM_PAGES),
 502         VMSTATE_UINT32_ARRAY(time_count, MAX31785State,
 503                              MAX31785_TOTAL_NUM_PAGES),
 504         VMSTATE_UINT16_ARRAY(temp_sensor_config, MAX31785State,
 505                              MAX31785_TOTAL_NUM_PAGES),
 506         VMSTATE_UINT16_ARRAY(fan_config, MAX31785State,
 507                              MAX31785_TOTAL_NUM_PAGES),
 508         VMSTATE_UINT16_ARRAY(read_fan_pwm, MAX31785State,
 509                              MAX31785_TOTAL_NUM_PAGES),
 510         VMSTATE_UINT16_ARRAY(fan_fault_limit, MAX31785State,
 511                              MAX31785_TOTAL_NUM_PAGES),
 512         VMSTATE_UINT16_ARRAY(fan_warn_limit, MAX31785State,
 513                              MAX31785_TOTAL_NUM_PAGES),
 514         VMSTATE_UINT16_ARRAY(fan_run_time, MAX31785State,
 515                              MAX31785_TOTAL_NUM_PAGES),
 516         VMSTATE_UINT16_ARRAY(fan_pwm_avg, MAX31785State,
 517                              MAX31785_TOTAL_NUM_PAGES),
 518         VMSTATE_UINT64_ARRAY(fan_pwm2rpm, MAX31785State,
 519                              MAX31785_TOTAL_NUM_PAGES),
 520         VMSTATE_UINT64(mfr_location, MAX31785State),
 521         VMSTATE_UINT64(mfr_date, MAX31785State),
 522         VMSTATE_UINT64(mfr_serial, MAX31785State),
 523         VMSTATE_END_OF_LIST()
 524     }
 525 };
 526
 527 static void max31785_init(Object *obj)
 528 {
 529     PMBusDevice *pmdev = PMBUS_DEVICE(obj);
 530
 531     for (int i = MAX31785_MIN_FAN_PAGE; i <= MAX31785_MAX_FAN_PAGE; i++) {
 532         pmbus_page_config(pmdev, i, PB_HAS_VOUT_MODE);
 533     }
 534
 535     for (int i = MAX31785_MIN_TEMP_PAGE; i <= MAX31785_MAX_TEMP_PAGE; i++) {
 536         pmbus_page_config(pmdev, i, PB_HAS_VOUT_MODE | PB_HAS_TEMPERATURE);
 537     }
 538
 539     for (int i = MAX31785_MIN_ADC_VOLTAGE_PAGE;
 540         i <= MAX31785_MAX_ADC_VOLTAGE_PAGE;
 541         i++) {
 542         pmbus_page_config(pmdev, i, PB_HAS_VOUT_MODE | PB_HAS_VOUT |
 543                                     PB_HAS_VOUT_RATING);
 544     }
 545 }
 546
 547 static void max31785_class_init(ObjectClass *klass, void *data)
 548 {
 549     ResettableClass *rc = RESETTABLE_CLASS(klass);
 550     DeviceClass *dc = DEVICE_CLASS(klass);
 551     PMBusDeviceClass *k = PMBUS_DEVICE_CLASS(klass);
 552     dc->desc = "Maxim MAX31785 6-Channel Fan Controller";
 553     dc->vmsd = &vmstate_max31785;
 554     k->write_data = max31785_write_data;
 555     k->receive_byte = max31785_read_byte;
 556     k->device_num_pages = MAX31785_TOTAL_NUM_PAGES;
 557     rc->phases.exit = max31785_exit_reset;
 558 }
 559
 560 static const TypeInfo max31785_info = {
 561     .name = TYPE_MAX31785,
 562     .parent = TYPE_PMBUS_DEVICE,
 563     .instance_size = sizeof(MAX31785State),
 564     .instance_init = max31785_init,
 565     .class_init = max31785_class_init,
 566 };
 567
 568 static void max31785_register_types(void)
 569 {
 570     type_register_static(&max31785_info);
 571 }
 572
 573 type_init(max31785_register_types)