max16064.c

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/*
 * Hardware monitoring driver for Maxim MAX16064
 *
 * Copyright (c) 2011 Ericsson AB.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#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 reg)
{
    int ret;

    switch (reg) {
    case PMBUS_VIRT_READ_VOUT_MAX:
        ret = pmbus_read_word_data(client, page,
                       MAX16064_MFR_VOUT_PEAK);
        break;
    case PMBUS_VIRT_READ_TEMP_MAX:
        ret = pmbus_read_word_data(client, page,
                       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,
              const struct i2c_device_id *id)
{
    return pmbus_do_probe(client, id, &max16064_info);
}

static const struct i2c_device_id max16064_id[] = {
    {"max16064", 0},
    {}
};

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,
    .remove = pmbus_do_remove,
    .id_table = max16064_id,
};

module_i2c_driver(max16064_driver);

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