lm25066.c

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/*
 * Hardware monitoring driver for LM25066 / LM5064 / LM5066
 *
 * 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/slab.h>
#include <linux/i2c.h>
#include "pmbus.h"

enum chips { lm25066, lm5064, lm5066 };

#define LM25066_READ_VAUX       0xd0
#define LM25066_MFR_READ_IIN        0xd1
#define LM25066_MFR_READ_PIN        0xd2
#define LM25066_MFR_IIN_OC_WARN_LIMIT   0xd3
#define LM25066_MFR_PIN_OP_WARN_LIMIT   0xd4
#define LM25066_READ_PIN_PEAK       0xd5
#define LM25066_CLEAR_PIN_PEAK      0xd6
#define LM25066_DEVICE_SETUP        0xd9
#define LM25066_READ_AVG_VIN        0xdc
#define LM25066_READ_AVG_VOUT       0xdd
#define LM25066_READ_AVG_IIN        0xde
#define LM25066_READ_AVG_PIN        0xdf

#define LM25066_DEV_SETUP_CL        (1 << 4)    /* Current limit */

struct lm25066_data {
    int id;
    struct pmbus_driver_info info;
};

#define to_lm25066_data(x)  container_of(x, struct lm25066_data, info)

static int lm25066_read_word_data(struct i2c_client *client, int page, int reg)
{
    const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
    const struct lm25066_data *data = to_lm25066_data(info);
    int ret;

    if (page > 1)
        return -ENXIO;

    /* Map READ_VAUX into READ_VOUT register on page 1 */
    if (page == 1) {
        switch (reg) {
        case PMBUS_READ_VOUT:
            ret = pmbus_read_word_data(client, 0,
                           LM25066_READ_VAUX);
            if (ret < 0)
                break;
            /* Adjust returned value to match VOUT coefficients */
            switch (data->id) {
            case lm25066:
                /* VOUT: 4.54 mV VAUX: 283.2 uV LSB */
                ret = DIV_ROUND_CLOSEST(ret * 2832, 45400);
                break;
            case lm5064:
                /* VOUT: 4.53 mV VAUX: 700 uV LSB */
                ret = DIV_ROUND_CLOSEST(ret * 70, 453);
                break;
            case lm5066:
                /* VOUT: 2.18 mV VAUX: 725 uV LSB */
                ret = DIV_ROUND_CLOSEST(ret * 725, 2180);
                break;
            }
            break;
        default:
            /* No other valid registers on page 1 */
            ret = -ENXIO;
            break;
        }
        goto done;
    }

    switch (reg) {
    case PMBUS_READ_IIN:
        ret = pmbus_read_word_data(client, 0, LM25066_MFR_READ_IIN);
        break;
    case PMBUS_READ_PIN:
        ret = pmbus_read_word_data(client, 0, LM25066_MFR_READ_PIN);
        break;
    case PMBUS_IIN_OC_WARN_LIMIT:
        ret = pmbus_read_word_data(client, 0,
                       LM25066_MFR_IIN_OC_WARN_LIMIT);
        break;
    case PMBUS_PIN_OP_WARN_LIMIT:
        ret = pmbus_read_word_data(client, 0,
                       LM25066_MFR_PIN_OP_WARN_LIMIT);
        break;
    case PMBUS_VIRT_READ_VIN_AVG:
        ret = pmbus_read_word_data(client, 0, LM25066_READ_AVG_VIN);
        break;
    case PMBUS_VIRT_READ_VOUT_AVG:
        ret = pmbus_read_word_data(client, 0, LM25066_READ_AVG_VOUT);
        break;
    case PMBUS_VIRT_READ_IIN_AVG:
        ret = pmbus_read_word_data(client, 0, LM25066_READ_AVG_IIN);
        break;
    case PMBUS_VIRT_READ_PIN_AVG:
        ret = pmbus_read_word_data(client, 0, LM25066_READ_AVG_PIN);
        break;
    case PMBUS_VIRT_READ_PIN_MAX:
        ret = pmbus_read_word_data(client, 0, LM25066_READ_PIN_PEAK);
        break;
    case PMBUS_VIRT_RESET_PIN_HISTORY:
        ret = 0;
        break;
    default:
        ret = -ENODATA;
        break;
    }
done:
    return ret;
}

static int lm25066_write_word_data(struct i2c_client *client, int page, int reg,
                   u16 word)
{
    int ret;

    if (page > 1)
        return -ENXIO;

    switch (reg) {
    case PMBUS_IIN_OC_WARN_LIMIT:
        ret = pmbus_write_word_data(client, 0,
                        LM25066_MFR_IIN_OC_WARN_LIMIT,
                        word);
        break;
    case PMBUS_PIN_OP_WARN_LIMIT:
        ret = pmbus_write_word_data(client, 0,
                        LM25066_MFR_PIN_OP_WARN_LIMIT,
                        word);
        break;
    case PMBUS_VIRT_RESET_PIN_HISTORY:
        ret = pmbus_write_byte(client, 0, LM25066_CLEAR_PIN_PEAK);
        break;
    default:
        ret = -ENODATA;
        break;
    }
    return ret;
}

static int lm25066_write_byte(struct i2c_client *client, int page, u8 value)
{
    if (page > 1)
        return -ENXIO;

    if (page <= 0)
        return pmbus_write_byte(client, page, value);

    return 0;
}

static int lm25066_probe(struct i2c_client *client,
              const struct i2c_device_id *id)
{
    int config;
    struct lm25066_data *data;
    struct pmbus_driver_info *info;

    if (!i2c_check_functionality(client->adapter,
                     I2C_FUNC_SMBUS_READ_BYTE_DATA))
        return -ENODEV;

    data = devm_kzalloc(&client->dev, sizeof(struct lm25066_data),
                GFP_KERNEL);
    if (!data)
        return -ENOMEM;

    config = i2c_smbus_read_byte_data(client, LM25066_DEVICE_SETUP);
    if (config < 0)
        return config;

    data->id = id->driver_data;
    info = &data->info;

    info->pages = 2;
    info->format[PSC_VOLTAGE_IN] = direct;
    info->format[PSC_VOLTAGE_OUT] = direct;
    info->format[PSC_CURRENT_IN] = direct;
    info->format[PSC_TEMPERATURE] = direct;
    info->format[PSC_POWER] = direct;

    info->m[PSC_TEMPERATURE] = 16;
    info->b[PSC_TEMPERATURE] = 0;
    info->R[PSC_TEMPERATURE] = 0;

    info->func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT
      | PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_PIN | PMBUS_HAVE_IIN
      | PMBUS_HAVE_STATUS_INPUT | PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP;
    info->func[1] = PMBUS_HAVE_VOUT;

    info->read_word_data = lm25066_read_word_data;
    info->write_word_data = lm25066_write_word_data;
    info->write_byte = lm25066_write_byte;

    switch (id->driver_data) {
    case lm25066:
        info->m[PSC_VOLTAGE_IN] = 22070;
        info->b[PSC_VOLTAGE_IN] = 0;
        info->R[PSC_VOLTAGE_IN] = -2;
        info->m[PSC_VOLTAGE_OUT] = 22070;
        info->b[PSC_VOLTAGE_OUT] = 0;
        info->R[PSC_VOLTAGE_OUT] = -2;

        if (config & LM25066_DEV_SETUP_CL) {
            info->m[PSC_CURRENT_IN] = 6852;
            info->b[PSC_CURRENT_IN] = 0;
            info->R[PSC_CURRENT_IN] = -2;
            info->m[PSC_POWER] = 369;
            info->b[PSC_POWER] = 0;
            info->R[PSC_POWER] = -2;
        } else {
            info->m[PSC_CURRENT_IN] = 13661;
            info->b[PSC_CURRENT_IN] = 0;
            info->R[PSC_CURRENT_IN] = -2;
            info->m[PSC_POWER] = 736;
            info->b[PSC_POWER] = 0;
            info->R[PSC_POWER] = -2;
        }
        break;
    case lm5064:
        info->m[PSC_VOLTAGE_IN] = 22075;
        info->b[PSC_VOLTAGE_IN] = 0;
        info->R[PSC_VOLTAGE_IN] = -2;
        info->m[PSC_VOLTAGE_OUT] = 22075;
        info->b[PSC_VOLTAGE_OUT] = 0;
        info->R[PSC_VOLTAGE_OUT] = -2;

        if (config & LM25066_DEV_SETUP_CL) {
            info->m[PSC_CURRENT_IN] = 6713;
            info->b[PSC_CURRENT_IN] = 0;
            info->R[PSC_CURRENT_IN] = -2;
            info->m[PSC_POWER] = 3619;
            info->b[PSC_POWER] = 0;
            info->R[PSC_POWER] = -3;
        } else {
            info->m[PSC_CURRENT_IN] = 13426;
            info->b[PSC_CURRENT_IN] = 0;
            info->R[PSC_CURRENT_IN] = -2;
            info->m[PSC_POWER] = 7238;
            info->b[PSC_POWER] = 0;
            info->R[PSC_POWER] = -3;
        }
        break;
    case lm5066:
        info->m[PSC_VOLTAGE_IN] = 4587;
        info->b[PSC_VOLTAGE_IN] = 0;
        info->R[PSC_VOLTAGE_IN] = -2;
        info->m[PSC_VOLTAGE_OUT] = 4587;
        info->b[PSC_VOLTAGE_OUT] = 0;
        info->R[PSC_VOLTAGE_OUT] = -2;

        if (config & LM25066_DEV_SETUP_CL) {
            info->m[PSC_CURRENT_IN] = 10753;
            info->b[PSC_CURRENT_IN] = 0;
            info->R[PSC_CURRENT_IN] = -2;
            info->m[PSC_POWER] = 1204;
            info->b[PSC_POWER] = 0;
            info->R[PSC_POWER] = -3;
        } else {
            info->m[PSC_CURRENT_IN] = 5405;
            info->b[PSC_CURRENT_IN] = 0;
            info->R[PSC_CURRENT_IN] = -2;
            info->m[PSC_POWER] = 605;
            info->b[PSC_POWER] = 0;
            info->R[PSC_POWER] = -3;
        }
        break;
    default:
        return -ENODEV;
    }

    return pmbus_do_probe(client, id, info);
}

static const struct i2c_device_id lm25066_id[] = {
    {"lm25066", lm25066},
    {"lm5064", lm5064},
    {"lm5066", lm5066},
    { }
};

MODULE_DEVICE_TABLE(i2c, lm25066_id);

/* This is the driver that will be inserted */
static struct i2c_driver lm25066_driver = {
    .driver = {
           .name = "lm25066",
           },
    .probe = lm25066_probe,
    .remove = pmbus_do_remove,
    .id_table = lm25066_id,
};

module_i2c_driver(lm25066_driver);

MODULE_AUTHOR("Guenter Roeck");
MODULE_DESCRIPTION("PMBus driver for LM25066/LM5064/LM5066");
MODULE_LICENSE("GPL");