linux-imx

/*

 * Hardware monitoring driver for Texas Instruments TPS53679

 *

 * Copyright (c) 2017 Mellanox Technologies. All rights reserved.

 * Copyright (c) 2017 Vadim Pasternak <vadimp@mellanox.com>

 *

 * 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/kernel.h>

#include <linux/module.h>

#include "pmbus.h"

​

#define TPS53679_PROT_VR12_5MV      0x01 /* VR12.0 mode, 5-mV DAC */

#define TPS53679_PROT_VR12_5_10MV   0x02 /* VR12.5 mode, 10-mV DAC */

#define TPS53679_PROT_VR13_10MV     0x04 /* VR13.0 mode, 10-mV DAC */

#define TPS53679_PROT_IMVP8_5MV     0x05 /* IMVP8 mode, 5-mV DAC */

#define TPS53679_PROT_VR13_5MV      0x07 /* VR13.0 mode, 5-mV DAC */

#define TPS53679_PAGE_NUM       2

​

static int tps53679_identify(struct i2c_client *client,

                 struct pmbus_driver_info *info)

{

    u8 vout_params;

    int ret;

​

    /* Read the register with VOUT scaling value.*/

    ret = pmbus_read_byte_data(client, 0, PMBUS_VOUT_MODE);

    if (ret < 0)

        return ret;

​

    vout_params = ret & GENMASK(4, 0);

​

    switch (vout_params) {

    case TPS53679_PROT_VR13_10MV:

    case TPS53679_PROT_VR12_5_10MV:

        info->vrm_version = vr13;

        break;

    case TPS53679_PROT_VR13_5MV:

    case TPS53679_PROT_VR12_5MV:

    case TPS53679_PROT_IMVP8_5MV:

        info->vrm_version = vr12;

        break;

    default:

        return -EINVAL;

    }

​

    return 0;

}

​

static struct pmbus_driver_info tps53679_info = {

    .pages = TPS53679_PAGE_NUM,