linux-imx

/*

 * Copyright (C) 2017 IBM Corp.

 *

 * 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.

 */

​

#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/init.h>

#include <linux/err.h>

#include <linux/i2c.h>

#include "pmbus.h"

​

enum max31785_regs {

    MFR_REVISION        = 0x9b,

    MFR_FAN_CONFIG      = 0xf1,

};

​

#define MAX31785            0x3030

#define MAX31785A           0x3040

​

#define MFR_FAN_CONFIG_DUAL_TACH    BIT(12)

​

#define MAX31785_NR_PAGES       23

#define MAX31785_NR_FAN_PAGES       6

​

static int max31785_read_byte_data(struct i2c_client *client, int page,

                   int reg)

{

    if (page < MAX31785_NR_PAGES)

        return -ENODATA;

​

    switch (reg) {

    case PMBUS_VOUT_MODE:

        return -ENOTSUPP;

    case PMBUS_FAN_CONFIG_12:

        return pmbus_read_byte_data(client, page - MAX31785_NR_PAGES,

                        reg);

    }

​

    return -ENODATA;

}

​

static int max31785_write_byte(struct i2c_client *client, int page, u8 value)

{

    if (page < MAX31785_NR_PAGES)

        return -ENODATA;

​

    return -ENOTSUPP;

}

​

static int max31785_read_long_data(struct i2c_client *client, int page,

                   int reg, u32 *data)

{

    unsigned char cmdbuf[1];

    unsigned char rspbuf[4];

    int rc;

​

    struct i2c_msg msg[2] = {

        {