xref: /qemu/hw/sensor/max31785.c (revision 12d1a768bdfea6e27a3a829228840d72507613a1)

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Maxim MAX31785 PMBus 6-Channel Fan Controller
 *
 * Datasheet:
 * https://datasheets.maximintegrated.com/en/ds/MAX31785.pdf
 *
 * Copyright(c) 2022 Qualcomm Innovation Center, Inc. All rights reserved.
 */

#include "qemu/osdep.h"
#include "hw/i2c/pmbus_device.h"
#include "hw/irq.h"
#include "migration/vmstate.h"
#include "qapi/error.h"
#include "qapi/visitor.h"
#include "qemu/log.h"
#include "qemu/module.h"

#define TYPE_MAX31785 "max31785"
#define MAX31785(obj) OBJECT_CHECK(MAX31785State, (obj), TYPE_MAX31785)

/* MAX31785 mfr specific PMBus commands */
#define MAX31785_MFR_MODE               0xD1
#define MAX31785_MFR_PSEN_CONFIG        0xD2
#define MAX31785_MFR_VOUT_PEAK          0xD4
#define MAX31785_MFR_TEMPERATURE_PEAK   0xD6
#define MAX31785_MFR_VOUT_MIN           0xD7
#define MAX31785_MFR_FAULT_RESPONSE     0xD9
#define MAX31785_MFR_NV_FAULT_LOG       0xDC
#define MAX31785_MFR_TIME_COUNT         0xDD
#define MAX31785_MFR_TEMP_SENSOR_CONFIG 0xF0
#define MAX31785_MFR_FAN_CONFIG         0xF1
#define MAX31785_MFR_FAN_LUT            0xF2
#define MAX31785_MFR_READ_FAN_PWM       0xF3
#define MAX31785_MFR_FAN_FAULT_LIMIT    0xF5
#define MAX31785_MFR_FAN_WARN_LIMIT     0xF6
#define MAX31785_MFR_FAN_RUN_TIME       0xF7
#define MAX31785_MFR_FAN_PWM_AVG        0xF8
#define MAX31785_MFR_FAN_PWM2RPM        0xF9

/* defaults as per the data sheet */
#define MAX31785_DEFAULT_CAPABILITY            0x10
#define MAX31785_DEFAULT_VOUT_MODE             0x40
#define MAX31785_DEFAULT_VOUT_SCALE_MONITOR    0x7FFF
#define MAX31785_DEFAULT_FAN_COMMAND_1         0x7FFF
#define MAX31785_DEFAULT_OV_FAULT_LIMIT        0x7FFF
#define MAX31785_DEFAULT_OV_WARN_LIMIT         0x7FFF
#define MAX31785_DEFAULT_OT_FAULT_LIMIT        0x7FFF
#define MAX31785_DEFAULT_OT_WARN_LIMIT         0x7FFF
#define MAX31785_DEFAULT_PMBUS_REVISION        0x11
#define MAX31785_DEFAULT_MFR_ID                0x4D
#define MAX31785_DEFAULT_MFR_MODEL             0x53
#define MAX31785_DEFAULT_MFR_REVISION          0x3030
#define MAX31785A_DEFAULT_MFR_REVISION         0x3040
#define MAX31785B_DEFAULT_MFR_REVISION         0x3061
#define MAX31785B_DEFAULT_MFR_TEMPERATURE_PEAK 0x8000
#define MAX31785B_DEFAULT_MFR_VOUT_MIN         0x7FFF
#define MAX31785_DEFAULT_TEXT                  0x3130313031303130

/* MAX31785 pages */
#define MAX31785_TOTAL_NUM_PAGES      23
#define MAX31785_FAN_PAGES            6
#define MAX31785_MIN_FAN_PAGE         0
#define MAX31785_MAX_FAN_PAGE         5
#define MAX31785_MIN_TEMP_PAGE        6
#define MAX31785_MAX_TEMP_PAGE        16
#define MAX31785_MIN_ADC_VOLTAGE_PAGE 17
#define MAX31785_MAX_ADC_VOLTAGE_PAGE 22

/* FAN_CONFIG_1_2 */
#define MAX31785_MFR_FAN_CONFIG                0xF1
#define MAX31785_FAN_CONFIG_ENABLE             BIT(7)
#define MAX31785_FAN_CONFIG_RPM_PWM            BIT(6)
#define MAX31785_FAN_CONFIG_PULSE(pulse)       (pulse << 4)
#define MAX31785_DEFAULT_FAN_CONFIG_1_2(pulse)                                 \
    (MAX31785_FAN_CONFIG_ENABLE | MAX31785_FAN_CONFIG_PULSE(pulse))
#define MAX31785_DEFAULT_MFR_FAN_CONFIG        0x0000

/* fan speed in RPM */
#define MAX31785_DEFAULT_FAN_SPEED   0x7fff
#define MAX31785_DEFAULT_FAN_STATUS  0x00

#define MAX31785_DEFAULT_FAN_MAX_PWM 0x2710

/*
 * MAX31785State:
 * @code: The command code received
 * @page: Each page corresponds to a device monitored by the Max 31785
 * The page register determines the available commands depending on device
 * _____________________________________________________________________________
 * |   0   |  Fan Connected to PWM0                                            |
 * |_______|___________________________________________________________________|
 * |   1   |  Fan Connected to PWM1                                            |
 * |_______|___________________________________________________________________|
 * |   2   |  Fan Connected to PWM2                                            |
 * |_______|___________________________________________________________________|
 * |   3   |  Fan Connected to PWM3                                            |
 * |_______|___________________________________________________________________|
 * |   4   |  Fan Connected to PWM4                                            |
 * |_______|___________________________________________________________________|
 * |   5   |  Fan Connected to PWM5                                            |
 * |_______|___________________________________________________________________|
 * |   6   |  Remote Thermal Diode Connected to ADC 0                          |
 * |_______|___________________________________________________________________|
 * |   7   |  Remote Thermal Diode Connected to ADC 1                          |
 * |_______|___________________________________________________________________|
 * |   8   |  Remote Thermal Diode Connected to ADC 2                          |
 * |_______|___________________________________________________________________|
 * |   9   |  Remote Thermal Diode Connected to ADC 3                          |
 * |_______|___________________________________________________________________|
 * |  10   |  Remote Thermal Diode Connected to ADC 4                          |
 * |_______|___________________________________________________________________|
 * |  11   |  Remote Thermal Diode Connected to ADC 5                          |
 * |_______|___________________________________________________________________|
 * |  12   |  Internal Temperature Sensor                                      |
 * |_______|___________________________________________________________________|
 * |  13   |  Remote I2C Temperature Sensor with Address 0                     |
 * |_______|___________________________________________________________________|
 * |  14   |  Remote I2C Temperature Sensor with Address 1                     |
 * |_______|___________________________________________________________________|
 * |  15   |  Remote I2C Temperature Sensor with Address 2                     |
 * |_______|___________________________________________________________________|
 * |  16   |  Remote I2C Temperature Sensor with Address 3                     |
 * |_______|___________________________________________________________________|
 * |  17   |  Remote I2C Temperature Sensor with Address 4                     |
 * |_______|___________________________________________________________________|
 * |  17   |  Remote Voltage Connected to ADC0                                 |
 * |_______|___________________________________________________________________|
 * |  18   |  Remote Voltage Connected to ADC1                                 |
 * |_______|___________________________________________________________________|
 * |  19   |  Remote Voltage Connected to ADC2                                 |
 * |_______|___________________________________________________________________|
 * |  20   |  Remote Voltage Connected to ADC3                                 |
 * |_______|___________________________________________________________________|
 * |  21   |  Remote Voltage Connected to ADC4                                 |
 * |_______|___________________________________________________________________|
 * |  22   |  Remote Voltage Connected to ADC5                                 |
 * |_______|___________________________________________________________________|
 * |23-254 |  Reserved                                                         |
 * |_______|___________________________________________________________________|
 * |  255  |  Applies to all pages                                             |
 * |_______|___________________________________________________________________|
 */

/* Place holder to save the max31785 mfr specific registers */
typedef struct MAX31785State {
    PMBusDevice parent;
    uint16_t mfr_mode[MAX31785_TOTAL_NUM_PAGES];
    uint16_t vout_peak[MAX31785_TOTAL_NUM_PAGES];
    uint16_t temperature_peak[MAX31785_TOTAL_NUM_PAGES];
    uint16_t vout_min[MAX31785_TOTAL_NUM_PAGES];
    uint8_t  fault_response[MAX31785_TOTAL_NUM_PAGES];
    uint32_t time_count[MAX31785_TOTAL_NUM_PAGES];
    uint16_t temp_sensor_config[MAX31785_TOTAL_NUM_PAGES];
    uint16_t fan_config[MAX31785_TOTAL_NUM_PAGES];
    uint16_t read_fan_pwm[MAX31785_TOTAL_NUM_PAGES];
    uint16_t fan_fault_limit[MAX31785_TOTAL_NUM_PAGES];
    uint16_t fan_warn_limit[MAX31785_TOTAL_NUM_PAGES];
    uint16_t fan_run_time[MAX31785_TOTAL_NUM_PAGES];
    uint16_t fan_pwm_avg[MAX31785_TOTAL_NUM_PAGES];
    uint64_t fan_pwm2rpm[MAX31785_TOTAL_NUM_PAGES];
    uint64_t mfr_location;
    uint64_t mfr_date;
    uint64_t mfr_serial;
    uint16_t mfr_revision;
} MAX31785State;

static uint8_t max31785_read_byte(PMBusDevice *pmdev)
{
    MAX31785State *s = MAX31785(pmdev);
    switch (pmdev->code) {

    case PMBUS_FAN_CONFIG_1_2:
        if (pmdev->page <= MAX31785_MAX_FAN_PAGE) {
            pmbus_send8(pmdev, pmdev->pages[pmdev->page].fan_config_1_2);
        }
        break;

    case PMBUS_FAN_COMMAND_1:
        if (pmdev->page <= MAX31785_MAX_FAN_PAGE) {
            pmbus_send16(pmdev, pmdev->pages[pmdev->page].fan_command_1);
        }
        break;

    case PMBUS_READ_FAN_SPEED_1:
        if (pmdev->page <= MAX31785_MAX_FAN_PAGE) {
            pmbus_send16(pmdev, pmdev->pages[pmdev->page].read_fan_speed_1);
        }
        break;

    case PMBUS_STATUS_FANS_1_2:
        if (pmdev->page <= MAX31785_MAX_FAN_PAGE) {
            pmbus_send16(pmdev, pmdev->pages[pmdev->page].status_fans_1_2);
        }
        break;

    case PMBUS_MFR_REVISION:
        pmbus_send16(pmdev, MAX31785_DEFAULT_MFR_REVISION);
        break;

    case PMBUS_MFR_ID:
        pmbus_send8(pmdev, 0x4d); /* Maxim */
        break;

    case PMBUS_MFR_MODEL:
        pmbus_send8(pmdev, 0x53);
        break;

    case PMBUS_MFR_LOCATION:
        pmbus_send64(pmdev, s->mfr_location);
        break;

    case PMBUS_MFR_DATE:
        pmbus_send64(pmdev, s->mfr_date);
        break;

    case PMBUS_MFR_SERIAL:
        pmbus_send64(pmdev, s->mfr_serial);
        break;

    case MAX31785_MFR_MODE:
        pmbus_send16(pmdev, s->mfr_mode[pmdev->page]);
        break;

    case MAX31785_MFR_VOUT_PEAK:
        if ((pmdev->page >= MAX31785_MIN_ADC_VOLTAGE_PAGE) &&
            (pmdev->page <= MAX31785_MAX_ADC_VOLTAGE_PAGE)) {
            pmbus_send16(pmdev, s->vout_peak[pmdev->page]);
        }
        break;

    case MAX31785_MFR_TEMPERATURE_PEAK:
        if ((pmdev->page >= MAX31785_MIN_TEMP_PAGE) &&
            (pmdev->page <= MAX31785_MAX_TEMP_PAGE)) {
            pmbus_send16(pmdev, s->temperature_peak[pmdev->page]);
        }
        break;

    case MAX31785_MFR_VOUT_MIN:
        if ((pmdev->page >= MAX31785_MIN_ADC_VOLTAGE_PAGE) &&
            (pmdev->page <= MAX31785_MAX_ADC_VOLTAGE_PAGE)) {
            pmbus_send16(pmdev, s->vout_min[pmdev->page]);
        }
        break;

    case MAX31785_MFR_FAULT_RESPONSE:
        pmbus_send8(pmdev, s->fault_response[pmdev->page]);
        break;

    case MAX31785_MFR_TIME_COUNT: /* R/W 32 */
        pmbus_send32(pmdev, s->time_count[pmdev->page]);
        break;

    case MAX31785_MFR_TEMP_SENSOR_CONFIG: /* R/W 16 */
        if ((pmdev->page >= MAX31785_MIN_TEMP_PAGE) &&
            (pmdev->page <= MAX31785_MAX_TEMP_PAGE)) {
            pmbus_send16(pmdev, s->temp_sensor_config[pmdev->page]);
        }
        break;

    case MAX31785_MFR_FAN_CONFIG: /* R/W 16 */
        if (pmdev->page <= MAX31785_MAX_FAN_PAGE) {
            pmbus_send16(pmdev, s->fan_config[pmdev->page]);
        }
        break;

    case MAX31785_MFR_READ_FAN_PWM: /* R/W 16 */
        if (pmdev->page <= MAX31785_MAX_FAN_PAGE) {
            pmbus_send16(pmdev, s->read_fan_pwm[pmdev->page]);
        }
        break;

    case MAX31785_MFR_FAN_FAULT_LIMIT: /* R/W 16 */
        if (pmdev->page <= MAX31785_MAX_FAN_PAGE) {
            pmbus_send16(pmdev, s->fan_fault_limit[pmdev->page]);
        }
        break;

    case MAX31785_MFR_FAN_WARN_LIMIT: /* R/W 16 */
        if (pmdev->page <= MAX31785_MAX_FAN_PAGE) {
            pmbus_send16(pmdev, s->fan_warn_limit[pmdev->page]);
        }
        break;

    case MAX31785_MFR_FAN_RUN_TIME: /* R/W 16 */
        if (pmdev->page <= MAX31785_MAX_FAN_PAGE) {
            pmbus_send16(pmdev, s->fan_run_time[pmdev->page]);
        }
        break;

    case MAX31785_MFR_FAN_PWM_AVG: /* R/W 16 */
        if (pmdev->page <= MAX31785_MAX_FAN_PAGE) {
            pmbus_send16(pmdev, s->fan_pwm_avg[pmdev->page]);
        }
        break;

    case MAX31785_MFR_FAN_PWM2RPM: /* R/W 64 */
        if (pmdev->page <= MAX31785_MAX_FAN_PAGE) {
            pmbus_send64(pmdev, s->fan_pwm2rpm[pmdev->page]);
        }
        break;

    default:
        qemu_log_mask(LOG_GUEST_ERROR,
        "%s: reading from unsupported register: 0x%02x\n",
        __func__, pmdev->code);
        break;
    }

    return 0xFF;
}

static int max31785_write_data(PMBusDevice *pmdev, const uint8_t *buf,
                               uint8_t len)
{
    MAX31785State *s = MAX31785(pmdev);
    if (len == 0) {
        qemu_log_mask(LOG_GUEST_ERROR, "%s: writing empty data\n", __func__);
        return -1;
    }

    pmdev->code = buf[0]; /* PMBus command code */

    if (len == 1) {
        return 0;
    }

    /* Exclude command code from buffer */
    buf++;
    len--;

    switch (pmdev->code) {

    case PMBUS_FAN_CONFIG_1_2:
        if (pmdev->page <= MAX31785_MAX_FAN_PAGE) {
            pmdev->pages[pmdev->page].fan_config_1_2 = pmbus_receive8(pmdev);
        }
        break;

    case PMBUS_FAN_COMMAND_1:
        if (pmdev->page <= MAX31785_MAX_FAN_PAGE) {
            pmdev->pages[pmdev->page].fan_command_1 = pmbus_receive16(pmdev);
            pmdev->pages[pmdev->page].read_fan_speed_1 =
                ((MAX31785_DEFAULT_FAN_SPEED / MAX31785_DEFAULT_FAN_MAX_PWM) *
                pmdev->pages[pmdev->page].fan_command_1);
        }
        break;

    case PMBUS_MFR_LOCATION: /* R/W 64 */
        s->mfr_location = pmbus_receive64(pmdev);
        break;

    case PMBUS_MFR_DATE: /* R/W 64 */
        s->mfr_date = pmbus_receive64(pmdev);
        break;

    case PMBUS_MFR_SERIAL: /* R/W 64 */
        s->mfr_serial = pmbus_receive64(pmdev);
        break;

    case MAX31785_MFR_MODE: /* R/W word */
        s->mfr_mode[pmdev->page] = pmbus_receive16(pmdev);
        break;

    case MAX31785_MFR_VOUT_PEAK: /* R/W word */
        if ((pmdev->page >= MAX31785_MIN_ADC_VOLTAGE_PAGE) &&
            (pmdev->page <= MAX31785_MAX_ADC_VOLTAGE_PAGE)) {
            s->vout_peak[pmdev->page] = pmbus_receive16(pmdev);
        }
        break;

    case MAX31785_MFR_TEMPERATURE_PEAK: /* R/W word */
        if ((pmdev->page >= 6) && (pmdev->page <= 16)) {
            s->temperature_peak[pmdev->page] = pmbus_receive16(pmdev);
        }
        break;

    case MAX31785_MFR_VOUT_MIN: /* R/W word */
        if ((pmdev->page >= MAX31785_MIN_ADC_VOLTAGE_PAGE) &&
            (pmdev->page <= MAX31785_MAX_ADC_VOLTAGE_PAGE)) {
            s->vout_min[pmdev->page] = pmbus_receive16(pmdev);
        }
        break;

    case MAX31785_MFR_FAULT_RESPONSE: /* R/W 8 */
        s->fault_response[pmdev->page] = pmbus_receive8(pmdev);
        break;

    case MAX31785_MFR_TIME_COUNT: /* R/W 32 */
        s->time_count[pmdev->page] = pmbus_receive32(pmdev);
        break;

    case MAX31785_MFR_TEMP_SENSOR_CONFIG: /* R/W 16 */
        if ((pmdev->page >= MAX31785_MIN_TEMP_PAGE) &&
            (pmdev->page <= MAX31785_MAX_TEMP_PAGE)) {
            s->temp_sensor_config[pmdev->page] = pmbus_receive16(pmdev);
        }
        break;

    case MAX31785_MFR_FAN_CONFIG: /* R/W 16 */
        if (pmdev->page <= MAX31785_MAX_FAN_PAGE) {
            s->fan_config[pmdev->page] = pmbus_receive16(pmdev);
        }
        break;

    case MAX31785_MFR_FAN_FAULT_LIMIT: /* R/W 16 */
        if (pmdev->page <= MAX31785_MAX_FAN_PAGE) {
            s->fan_fault_limit[pmdev->page] = pmbus_receive16(pmdev);
        }
        break;

    case MAX31785_MFR_FAN_WARN_LIMIT: /* R/W 16 */
        if (pmdev->page <= MAX31785_MAX_FAN_PAGE) {
            s->fan_warn_limit[pmdev->page] = pmbus_receive16(pmdev);
        }
        break;

    case MAX31785_MFR_FAN_RUN_TIME: /* R/W 16 */
        if (pmdev->page <= MAX31785_MAX_FAN_PAGE) {
            s->fan_run_time[pmdev->page] = pmbus_receive16(pmdev);
        }
        break;

    case MAX31785_MFR_FAN_PWM_AVG: /* R/W 16 */
        if (pmdev->page <= MAX31785_MAX_FAN_PAGE) {
            s->fan_pwm_avg[pmdev->page] = pmbus_receive16(pmdev);
        }
        break;

    case MAX31785_MFR_FAN_PWM2RPM: /* R/W 64 */
        if (pmdev->page <= MAX31785_MAX_FAN_PAGE) {
            s->fan_pwm2rpm[pmdev->page] = pmbus_receive64(pmdev);
        }
        break;

    default:
        qemu_log_mask(LOG_GUEST_ERROR,
                      "%s: writing to unsupported register: 0x%02x\n",
                      __func__, pmdev->code);
        break;
    }

    return 0;
}

static void max31785_exit_reset(Object *obj, ResetType type)
{
    PMBusDevice *pmdev = PMBUS_DEVICE(obj);
    MAX31785State *s = MAX31785(obj);

    pmdev->capability = MAX31785_DEFAULT_CAPABILITY;

    for (int i = MAX31785_MIN_FAN_PAGE; i <= MAX31785_MAX_FAN_PAGE; i++) {
        pmdev->pages[i].vout_mode = MAX31785_DEFAULT_VOUT_MODE;
        pmdev->pages[i].fan_command_1 = MAX31785_DEFAULT_FAN_COMMAND_1;
        pmdev->pages[i].revision = MAX31785_DEFAULT_PMBUS_REVISION;
        pmdev->pages[i].fan_config_1_2 = MAX31785_DEFAULT_FAN_CONFIG_1_2(0);
        pmdev->pages[i].read_fan_speed_1 = MAX31785_DEFAULT_FAN_SPEED;
        pmdev->pages[i].status_fans_1_2 = MAX31785_DEFAULT_FAN_STATUS;
    }

    for (int i = MAX31785_MIN_TEMP_PAGE; i <= MAX31785_MAX_TEMP_PAGE; i++) {
        pmdev->pages[i].vout_mode = MAX31785_DEFAULT_VOUT_MODE;
        pmdev->pages[i].revision = MAX31785_DEFAULT_PMBUS_REVISION;
        pmdev->pages[i].ot_fault_limit = MAX31785_DEFAULT_OT_FAULT_LIMIT;
        pmdev->pages[i].ot_warn_limit = MAX31785_DEFAULT_OT_WARN_LIMIT;
    }

    for (int i = MAX31785_MIN_ADC_VOLTAGE_PAGE;
         i <= MAX31785_MAX_ADC_VOLTAGE_PAGE;
         i++) {
        pmdev->pages[i].vout_mode = MAX31785_DEFAULT_VOUT_MODE;
        pmdev->pages[i].revision = MAX31785_DEFAULT_PMBUS_REVISION;
        pmdev->pages[i].vout_scale_monitor =
            MAX31785_DEFAULT_VOUT_SCALE_MONITOR;
        pmdev->pages[i].vout_ov_fault_limit = MAX31785_DEFAULT_OV_FAULT_LIMIT;
        pmdev->pages[i].vout_ov_warn_limit = MAX31785_DEFAULT_OV_WARN_LIMIT;
    }

    s->mfr_location = MAX31785_DEFAULT_TEXT;
    s->mfr_date = MAX31785_DEFAULT_TEXT;
    s->mfr_serial = MAX31785_DEFAULT_TEXT;
}

static const VMStateDescription vmstate_max31785 = {
    .name = TYPE_MAX31785,
    .version_id = 0,
    .minimum_version_id = 0,
    .fields = (const VMStateField[]){
        VMSTATE_PMBUS_DEVICE(parent, MAX31785State),
        VMSTATE_UINT16_ARRAY(mfr_mode, MAX31785State,
                             MAX31785_TOTAL_NUM_PAGES),
        VMSTATE_UINT16_ARRAY(vout_peak, MAX31785State,
                             MAX31785_TOTAL_NUM_PAGES),
        VMSTATE_UINT16_ARRAY(temperature_peak, MAX31785State,
                             MAX31785_TOTAL_NUM_PAGES),
        VMSTATE_UINT16_ARRAY(vout_min, MAX31785State,
                             MAX31785_TOTAL_NUM_PAGES),
        VMSTATE_UINT8_ARRAY(fault_response, MAX31785State,
                            MAX31785_TOTAL_NUM_PAGES),
        VMSTATE_UINT32_ARRAY(time_count, MAX31785State,
                             MAX31785_TOTAL_NUM_PAGES),
        VMSTATE_UINT16_ARRAY(temp_sensor_config, MAX31785State,
                             MAX31785_TOTAL_NUM_PAGES),
        VMSTATE_UINT16_ARRAY(fan_config, MAX31785State,
                             MAX31785_TOTAL_NUM_PAGES),
        VMSTATE_UINT16_ARRAY(read_fan_pwm, MAX31785State,
                             MAX31785_TOTAL_NUM_PAGES),
        VMSTATE_UINT16_ARRAY(fan_fault_limit, MAX31785State,
                             MAX31785_TOTAL_NUM_PAGES),
        VMSTATE_UINT16_ARRAY(fan_warn_limit, MAX31785State,
                             MAX31785_TOTAL_NUM_PAGES),
        VMSTATE_UINT16_ARRAY(fan_run_time, MAX31785State,
                             MAX31785_TOTAL_NUM_PAGES),
        VMSTATE_UINT16_ARRAY(fan_pwm_avg, MAX31785State,
                             MAX31785_TOTAL_NUM_PAGES),
        VMSTATE_UINT64_ARRAY(fan_pwm2rpm, MAX31785State,
                             MAX31785_TOTAL_NUM_PAGES),
        VMSTATE_UINT64(mfr_location, MAX31785State),
        VMSTATE_UINT64(mfr_date, MAX31785State),
        VMSTATE_UINT64(mfr_serial, MAX31785State),
        VMSTATE_END_OF_LIST()
    }
};

static void max31785_init(Object *obj)
{
    PMBusDevice *pmdev = PMBUS_DEVICE(obj);

    for (int i = MAX31785_MIN_FAN_PAGE; i <= MAX31785_MAX_FAN_PAGE; i++) {
        pmbus_page_config(pmdev, i, PB_HAS_VOUT_MODE);
    }

    for (int i = MAX31785_MIN_TEMP_PAGE; i <= MAX31785_MAX_TEMP_PAGE; i++) {
        pmbus_page_config(pmdev, i, PB_HAS_VOUT_MODE | PB_HAS_TEMPERATURE);
    }

    for (int i = MAX31785_MIN_ADC_VOLTAGE_PAGE;
        i <= MAX31785_MAX_ADC_VOLTAGE_PAGE;
        i++) {
        pmbus_page_config(pmdev, i, PB_HAS_VOUT_MODE | PB_HAS_VOUT |
                                    PB_HAS_VOUT_RATING);
    }
}

static void max31785_class_init(ObjectClass *klass, const void *data)
{
    ResettableClass *rc = RESETTABLE_CLASS(klass);
    DeviceClass *dc = DEVICE_CLASS(klass);
    PMBusDeviceClass *k = PMBUS_DEVICE_CLASS(klass);
    dc->desc = "Maxim MAX31785 6-Channel Fan Controller";
    dc->vmsd = &vmstate_max31785;
    k->write_data = max31785_write_data;
    k->receive_byte = max31785_read_byte;
    k->device_num_pages = MAX31785_TOTAL_NUM_PAGES;
    rc->phases.exit = max31785_exit_reset;
}

static const TypeInfo max31785_info = {
    .name = TYPE_MAX31785,
    .parent = TYPE_PMBUS_DEVICE,
    .instance_size = sizeof(MAX31785State),
    .instance_init = max31785_init,
    .class_init = max31785_class_init,
};

static void max31785_register_types(void)
{
    type_register_static(&max31785_info);
}

type_init(max31785_register_types)