linux-imx

// SPDX-License-Identifier: GPL-2.0-only

/*

 * Driver for

 *  Maxim MAX16065/MAX16066 12-Channel/8-Channel, Flash-Configurable

 *  System Managers with Nonvolatile Fault Registers

 *  Maxim MAX16067/MAX16068 6-Channel, Flash-Configurable System Managers

 *  with Nonvolatile Fault Registers

 *  Maxim MAX16070/MAX16071 12-Channel/8-Channel, Flash-Configurable System

 *  Monitors with Nonvolatile Fault Registers

 *

 * Copyright (C) 2011 Ericsson AB.

 */

​

#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 <linux/hwmon.h>

#include <linux/hwmon-sysfs.h>

#include <linux/jiffies.h>

​

enum chips { max16065, max16066, max16067, max16068, max16070, max16071 };

​

/*

 * Registers

 */

#define MAX16065_ADC(x)     ((x) * 2)

​

#define MAX16065_CURR_SENSE 0x18

#define MAX16065_CSP_ADC    0x19

#define MAX16065_FAULT(x)   (0x1b + (x))

#define MAX16065_SCALE(x)   (0x43 + (x))

#define MAX16065_CURR_CONTROL   0x47

#define MAX16065_LIMIT(l, x)    (0x48 + (l) + (x) * 3)  /*

                             * l: limit

                             *  0: min/max

                             *  1: crit

                             *  2: lcrit

                             * x: ADC index

                             */

​

#define MAX16065_SW_ENABLE  0x73

​

#define MAX16065_WARNING_OV (1 << 3) /* Set if secondary threshold is OV

                        warning */

​

#define MAX16065_CURR_ENABLE    (1 << 0)

​

#define MAX16065_NUM_LIMIT  3

#define MAX16065_NUM_ADC    12  /* maximum number of ADC channels */

​

static const int max16065_num_adc[] = {

    [max16065] = 12,

    [max16066] = 8,

    [max16067] = 6,

    [max16068] = 6,

    [max16070] = 12,

    [max16071] = 8,

};

​

static const bool max16065_have_secondary[] = {

    [max16065] = true,

    [max16066] = true,

    [max16067] = false,

    [max16068] = false,

    [max16070] = true,

    [max16071] = true,

};

​

static const bool max16065_have_current[] = {

    [max16065] = true,

    [max16066] = true,

    [max16067] = false,

    [max16068] = false,

    [max16070] = true,

    [max16071] = true,

};

​

struct max16065_data {

    enum chips type;

    struct i2c_client *client;

    const struct attribute_group *groups[4];

    struct mutex update_lock;

    bool valid;

    unsigned long last_updated; /* in jiffies */

    int num_adc;

    bool have_current;

    int curr_gain;

    /* limits are in mV */

    int limit[MAX16065_NUM_LIMIT][MAX16065_NUM_ADC];