linux-imx

/*

 * Driver for Linear Technology LTC2990 power monitor

 *

 * Copyright (C) 2014 Topic Embedded Products

 * Author: Mike Looijmans <mike.looijmans@topic.nl>

 *

 * License: GPLv2

 */

​

#include <linux/bitops.h>

#include <linux/err.h>

#include <linux/hwmon.h>

#include <linux/hwmon-sysfs.h>

#include <linux/i2c.h>

#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/of.h>

​

#define LTC2990_STATUS  0x00

#define LTC2990_CONTROL 0x01

#define LTC2990_TRIGGER 0x02

#define LTC2990_TINT_MSB    0x04

#define LTC2990_V1_MSB  0x06

#define LTC2990_V2_MSB  0x08

#define LTC2990_V3_MSB  0x0A

#define LTC2990_V4_MSB  0x0C

#define LTC2990_VCC_MSB 0x0E

​

#define LTC2990_IN0 BIT(0)

#define LTC2990_IN1 BIT(1)

#define LTC2990_IN2 BIT(2)

#define LTC2990_IN3 BIT(3)

#define LTC2990_IN4 BIT(4)

#define LTC2990_CURR1   BIT(5)

#define LTC2990_CURR2   BIT(6)

#define LTC2990_TEMP1   BIT(7)

#define LTC2990_TEMP2   BIT(8)

#define LTC2990_TEMP3   BIT(9)

#define LTC2990_NONE    0

#define LTC2990_ALL GENMASK(9, 0)

​

#define LTC2990_MODE0_SHIFT 0

#define LTC2990_MODE0_MASK  GENMASK(2, 0)

#define LTC2990_MODE1_SHIFT 3

#define LTC2990_MODE1_MASK  GENMASK(1, 0)

​

/* Enabled measurements for mode bits 2..0 */

static const int ltc2990_attrs_ena_0[] = {

    LTC2990_IN1 | LTC2990_IN2 | LTC2990_TEMP3,

    LTC2990_CURR1 | LTC2990_TEMP3,

    LTC2990_CURR1 | LTC2990_IN3 | LTC2990_IN4,

    LTC2990_TEMP2 | LTC2990_IN3 | LTC2990_IN4,

    LTC2990_TEMP2 | LTC2990_CURR2,

    LTC2990_TEMP2 | LTC2990_TEMP3,

    LTC2990_CURR1 | LTC2990_CURR2,

    LTC2990_IN1 | LTC2990_IN2 | LTC2990_IN3 | LTC2990_IN4

};

​

/* Enabled measurements for mode bits 4..3 */

static const int ltc2990_attrs_ena_1[] = {

    LTC2990_NONE,

    LTC2990_TEMP2 | LTC2990_IN1 | LTC2990_CURR1,

    LTC2990_TEMP3 | LTC2990_IN3 | LTC2990_CURR2,

    LTC2990_ALL

};

​

struct ltc2990_data {

    struct i2c_client *i2c;

    u32 mode[2];

};

​

/* Return the converted value from the given register in uV or mC */

static int ltc2990_get_value(struct i2c_client *i2c, int index, int *result)

{

    int val;

    u8 reg;

​

    switch (index) {

    case LTC2990_IN0:

        reg = LTC2990_VCC_MSB;

        break;

    case LTC2990_IN1:

    case LTC2990_CURR1:

    case LTC2990_TEMP2:

        reg = LTC2990_V1_MSB;

        break;

    case LTC2990_IN2:

        reg = LTC2990_V2_MSB;

        break;

    case LTC2990_IN3:

    case LTC2990_CURR2:

    case LTC2990_TEMP3: