linux-imx

/*

 * Hardware monitoring driver for Maxim MAX34440/MAX34441

 *

 * Copyright (c) 2011 Ericsson AB.

 * Copyright (c) 2012 Guenter Roeck

 *

 * 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/bitops.h>

#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/init.h>

#include <linux/err.h>

#include <linux/i2c.h>

#include "pmbus.h"

​

enum chips { max34440, max34441, max34446, max34451, max34460, max34461 };

​

#define MAX34440_MFR_VOUT_PEAK      0xd4

#define MAX34440_MFR_IOUT_PEAK      0xd5

#define MAX34440_MFR_TEMPERATURE_PEAK   0xd6

#define MAX34440_MFR_VOUT_MIN       0xd7

​

#define MAX34446_MFR_POUT_PEAK      0xe0

#define MAX34446_MFR_POUT_AVG       0xe1

#define MAX34446_MFR_IOUT_AVG       0xe2

#define MAX34446_MFR_TEMPERATURE_AVG    0xe3

​

#define MAX34440_STATUS_OC_WARN     BIT(0)

#define MAX34440_STATUS_OC_FAULT    BIT(1)

#define MAX34440_STATUS_OT_FAULT    BIT(5)

#define MAX34440_STATUS_OT_WARN     BIT(6)

​

#define MAX34451_MFR_CHANNEL_CONFIG 0xe4

#define MAX34451_MFR_CHANNEL_CONFIG_SEL_MASK    0x3f

​

struct max34440_data {

    int id;

    struct pmbus_driver_info info;

};

​

#define to_max34440_data(x)  container_of(x, struct max34440_data, info)

​

static int max34440_read_word_data(struct i2c_client *client, int page, int reg)

{

    int ret;

    const struct pmbus_driver_info *info = pmbus_get_driver_info(client);

    const struct max34440_data *data = to_max34440_data(info);

​

    switch (reg) {

    case PMBUS_VIRT_READ_VOUT_MIN:

        ret = pmbus_read_word_data(client, page,

                       MAX34440_MFR_VOUT_MIN);

        break;

    case PMBUS_VIRT_READ_VOUT_MAX:

        ret = pmbus_read_word_data(client, page,

                       MAX34440_MFR_VOUT_PEAK);

        break;

    case PMBUS_VIRT_READ_IOUT_AVG:

        if (data->id != max34446 && data->id != max34451)

            return -ENXIO;

        ret = pmbus_read_word_data(client, page,

                       MAX34446_MFR_IOUT_AVG);

        break;

    case PMBUS_VIRT_READ_IOUT_MAX:

        ret = pmbus_read_word_data(client, page,

                       MAX34440_MFR_IOUT_PEAK);

        break;

    case PMBUS_VIRT_READ_POUT_AVG:

        if (data->id != max34446)

            return -ENXIO;

        ret = pmbus_read_word_data(client, page,

                       MAX34446_MFR_POUT_AVG);

        break;

    case PMBUS_VIRT_READ_POUT_MAX:

        if (data->id != max34446)

            return -ENXIO;

        ret = pmbus_read_word_data(client, page,

                       MAX34446_MFR_POUT_PEAK);