linux-imx

/*

 * Hardware monitoring driver for LTC3815

 *

 * Copyright (c) 2015 Linear Technology

 * Copyright (c) 2015 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.

 */

​

#include <linux/err.h>

#include <linux/i2c.h>

#include <linux/init.h>

#include <linux/jiffies.h>

#include <linux/kernel.h>

#include <linux/module.h>

#include "pmbus.h"

​

#define LTC3815_MFR_IOUT_PEAK   0xd7

#define LTC3815_MFR_VOUT_PEAK   0xdd

#define LTC3815_MFR_VIN_PEAK    0xde

#define LTC3815_MFR_TEMP_PEAK   0xdf

#define LTC3815_MFR_IIN_PEAK    0xe1

#define LTC3815_MFR_SPECIAL_ID  0xe7

​

#define LTC3815_ID      0x8000

#define LTC3815_ID_MASK     0xff00

​

static int ltc3815_read_byte_data(struct i2c_client *client, int page, int reg)

{

    int ret;

​

    switch (reg) {

    case PMBUS_VOUT_MODE:

        /*

         * The chip returns 0x3e, suggesting VID mode with manufacturer

         * specific VID codes. Since the output voltage is reported

         * with a LSB of 0.5mV, override and report direct mode with

         * appropriate coefficients.

         */

        ret = 0x40;

        break;

    default:

        ret = -ENODATA;

        break;

    }

    return ret;

}

​

static int ltc3815_write_byte(struct i2c_client *client, int page, u8 reg)

{

    int ret;

​

    switch (reg) {

    case PMBUS_CLEAR_FAULTS:

        /*