// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Hardware monitoring driver for Maxim MAX16064
 *
 * Copyright (c) 2011 Ericsson AB.
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/err.h>
#include <linux/i2c.h>
#include "pmbus.h"

#define MAX16064_MFR_VOUT_PEAK          0xd4
#define MAX16064_MFR_TEMPERATURE_PEAK   0xd6

static int max16064_read_word_data(struct i2c_client *client, int page,
                                   int phase, int reg)
{
        int ret;

        switch (reg) {
        case PMBUS_VIRT_READ_VOUT_MAX:
                ret = pmbus_read_word_data(client, page, phase,
                                           MAX16064_MFR_VOUT_PEAK);
                break;
        case PMBUS_VIRT_READ_TEMP_MAX:
                ret = pmbus_read_word_data(client, page, phase,
                                           MAX16064_MFR_TEMPERATURE_PEAK);
                break;
        case PMBUS_VIRT_RESET_VOUT_HISTORY:
        case PMBUS_VIRT_RESET_TEMP_HISTORY:
                ret = 0;
                break;
        default:
                ret = -ENODATA;
                break;
        }
        return ret;
}

static int max16064_write_word_data(struct i2c_client *client, int page,
                                    int reg, u16 word)
{
        int ret;

        switch (reg) {
        case PMBUS_VIRT_RESET_VOUT_HISTORY:
                ret = pmbus_write_word_data(client, page,
                                            MAX16064_MFR_VOUT_PEAK, 0);
                break;
        case PMBUS_VIRT_RESET_TEMP_HISTORY:
                ret = pmbus_write_word_data(client, page,
                                            MAX16064_MFR_TEMPERATURE_PEAK,
                                            0xffff);
                break;
        default:
                ret = -ENODATA;
                break;
        }
        return ret;
}

static struct pmbus_driver_info max16064_info = {
        .pages = 4,
        .format[PSC_VOLTAGE_IN] = direct,
        .format[PSC_VOLTAGE_OUT] = direct,
        .format[PSC_TEMPERATURE] = direct,
        .m[PSC_VOLTAGE_IN] = 19995,
        .b[PSC_VOLTAGE_IN] = 0,
        .R[PSC_VOLTAGE_IN] = -1,
        .m[PSC_VOLTAGE_OUT] = 19995,
        .b[PSC_VOLTAGE_OUT] = 0,
        .R[PSC_VOLTAGE_OUT] = -1,
        .m[PSC_TEMPERATURE] = -7612,
        .b[PSC_TEMPERATURE] = 335,
        .R[PSC_TEMPERATURE] = -3,
        .func[0] = PMBUS_HAVE_VOUT | PMBUS_HAVE_TEMP
                | PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_STATUS_TEMP,
        .func[1] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT,
        .func[2] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT,
        .func[3] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT,
        .read_word_data = max16064_read_word_data,
        .write_word_data = max16064_write_word_data,
};

static int max16064_probe(struct i2c_client *client)
{
        return pmbus_do_probe(client, &max16064_info);
}

static const struct i2c_device_id max16064_id[] = {
        {"max16064"},
        {}
};

MODULE_DEVICE_TABLE(i2c, max16064_id);

/* This is the driver that will be inserted */
static struct i2c_driver max16064_driver = {
        .driver = {
                   .name = "max16064",
                   },
        .probe = max16064_probe,
        .id_table = max16064_id,
};

module_i2c_driver(max16064_driver);

MODULE_AUTHOR("Guenter Roeck");
MODULE_DESCRIPTION("PMBus driver for Maxim MAX16064");
MODULE_LICENSE("GPL");
MODULE_IMPORT_NS("PMBUS");