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/* Copyright (c) 2014 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*
* TI INA231 Current/Power monitor driver.
*/
#ifndef INA231_H
#define INA231_H
#define INA231_REG_CONFIG 0x00
#define INA231_REG_SHUNT_VOLT 0x01
#define INA231_REG_BUS_VOLT 0x02
#define INA231_REG_POWER 0x03
#define INA231_REG_CURRENT 0x04
#define INA231_REG_CALIB 0x05
#define INA231_REG_MASK 0x06
#define INA231_REG_ALERT 0x07
#define INA231_CONFIG_MODE_MASK (7 << 0)
#define INA231_CONFIG_MODE_PWRDWN (0 << 0)
#define INA231_CONFIG_MODE_SHUNT (1 << 0)
#define INA231_CONFIG_MODE_BUS (1 << 1)
#define INA231_CONFIG_MODE_TRG (0 << 2)
#define INA231_CONFIG_MODE_CONT (1 << 2)
/* Conversion time for bus and shunt in micro-seconds */
enum ina231_conv_time {
INA231_CONV_TIME_140 = 0x00,
INA231_CONV_TIME_204 = 0x01,
INA231_CONV_TIME_332 = 0x02,
INA231_CONV_TIME_588 = 0x03,
INA231_CONV_TIME_1100 = 0x04,
INA231_CONV_TIME_2116 = 0x05,
INA231_CONV_TIME_4156 = 0x06,
INA231_CONV_TIME_8244 = 0x07,
};
#define INA231_CONV_TIME_MASK 0x7
#define INA231_CONFIG_SHUNT_CONV_TIME(t) ((t) << 3)
#define INA231_CONFIG_BUS_CONV_TIME(t) ((t) << 6)
#define INA231_CONFIG_AVG_1 (0 << 9)
#define INA231_CONFIG_AVG_4 (1 << 9)
#define INA231_CONFIG_AVG_16 (2 << 9)
#define INA231_CONFIG_AVG_64 (3 << 9)
#define INA231_CONFIG_AVG_128 (4 << 9)
#define INA231_CONFIG_AVG_256 (5 << 9)
#define INA231_CONFIG_AVG_512 (6 << 9)
#define INA231_CONFIG_AVG_1024 (7 << 9)
#define INA231_MASK_EN_LEN (1 << 0)
#define INA231_MASK_EN_APOL (1 << 1)
#define INA231_MASK_EN_OVF (1 << 2)
#define INA231_MASK_EN_CVRF (1 << 3)
#define INA231_MASK_EN_AFF (1 << 4)
#define INA231_MASK_EN_CNVR (1 << 10)
#define INA231_MASK_EN_POL (1 << 11)
#define INA231_MASK_EN_BUL (1 << 12)
#define INA231_MASK_EN_BOL (1 << 13)
#define INA231_MASK_EN_SUL (1 << 14)
#define INA231_MASK_EN_SOL (1 << 15)
/* Calibration value to get current LSB = 1mA */
#define INA231_CALIB_1MA(rsense_mohm) (5120/(rsense_mohm))
/* Bus voltage LSB : 1.25mV / bit */
#define INA231_BUS_MV(reg) ((reg) * 125 / 100)
/* Power LSB : 25mW / current_lsb */
#define INA231_POW_MW(reg) ((reg) * 25 * 1/*Current mA/LSB*/)
/* Read INA231 register. */
uint16_t ina231_read(uint8_t idx, uint8_t reg);
/* Write INA231 register. */
int ina231_write(uint8_t idx, uint8_t reg, uint16_t val);
/* Set measurement parameters */
int ina231_init(uint8_t idx, uint16_t config, uint16_t calib);
/* Return bus voltage in milliVolts */
int ina231_get_voltage(uint8_t idx);
/* Return current in milliAmps */
int ina231_get_current(uint8_t idx);
/* Return power in milliWatts */
int ina231_get_power(uint8_t idx);
#endif /* INA231_H */
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