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976260dc69
Add a driver for INA231 Power/Current monitoring I2C chip. Signed-off-by: Vincent Palatin <vpalatin@chromium.org> BRANCH=none BUG=chrome-os-partner:28337 TEST=make BOARD=twinkie and run "ina" command on Twinkie. Change-Id: Id322aca74cbb6bbf866aed22e7815c0e01951414 Reviewed-on: https://chromium-review.googlesource.com/202205 Reviewed-by: Todd Broch <tbroch@chromium.org> Commit-Queue: Vincent Palatin <vpalatin@chromium.org> Tested-by: Vincent Palatin <vpalatin@chromium.org>
91 lines
2.9 KiB
C
91 lines
2.9 KiB
C
/* Copyright (c) 2014 The Chromium OS Authors. All rights reserved.
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*
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* TI INA231 Current/Power monitor driver.
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*/
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#ifndef INA231_H
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#define INA231_H
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#define INA231_REG_CONFIG 0x00
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#define INA231_REG_SHUNT_VOLT 0x01
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#define INA231_REG_BUS_VOLT 0x02
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#define INA231_REG_POWER 0x03
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#define INA231_REG_CURRENT 0x04
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#define INA231_REG_CALIB 0x05
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#define INA231_REG_MASK 0x06
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#define INA231_REG_ALERT 0x07
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#define INA231_CONFIG_MODE_MASK (7 << 0)
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#define INA231_CONFIG_MODE_PWRDWN (0 << 0)
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#define INA231_CONFIG_MODE_SHUNT (1 << 0)
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#define INA231_CONFIG_MODE_BUS (1 << 1)
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#define INA231_CONFIG_MODE_TRG (0 << 2)
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#define INA231_CONFIG_MODE_CONT (1 << 2)
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/* Conversion time for bus and shunt in micro-seconds */
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enum ina231_conv_time {
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INA231_CONV_TIME_140 = 0x00,
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INA231_CONV_TIME_204 = 0x01,
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INA231_CONV_TIME_332 = 0x02,
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INA231_CONV_TIME_588 = 0x03,
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INA231_CONV_TIME_1100 = 0x04,
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INA231_CONV_TIME_2116 = 0x05,
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INA231_CONV_TIME_4156 = 0x06,
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INA231_CONV_TIME_8244 = 0x07,
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};
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#define INA231_CONV_TIME_MASK 0x7
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#define INA231_CONFIG_SHUNT_CONV_TIME(t) ((t) << 3)
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#define INA231_CONFIG_BUS_CONV_TIME(t) ((t) << 6)
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#define INA231_CONFIG_AVG_1 (0 << 9)
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#define INA231_CONFIG_AVG_4 (1 << 9)
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#define INA231_CONFIG_AVG_16 (2 << 9)
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#define INA231_CONFIG_AVG_64 (3 << 9)
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#define INA231_CONFIG_AVG_128 (4 << 9)
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#define INA231_CONFIG_AVG_256 (5 << 9)
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#define INA231_CONFIG_AVG_512 (6 << 9)
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#define INA231_CONFIG_AVG_1024 (7 << 9)
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#define INA231_MASK_EN_LEN (1 << 0)
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#define INA231_MASK_EN_APOL (1 << 1)
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#define INA231_MASK_EN_OVF (1 << 2)
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#define INA231_MASK_EN_CVRF (1 << 3)
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#define INA231_MASK_EN_AFF (1 << 4)
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#define INA231_MASK_EN_CNVR (1 << 10)
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#define INA231_MASK_EN_POL (1 << 11)
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#define INA231_MASK_EN_BUL (1 << 12)
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#define INA231_MASK_EN_BOL (1 << 13)
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#define INA231_MASK_EN_SUL (1 << 14)
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#define INA231_MASK_EN_SOL (1 << 15)
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/* Calibration value to get current LSB = 1mA */
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#define INA231_CALIB_1MA(rsense_mohm) (5120/(rsense_mohm))
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/* Bus voltage LSB : 1.25mV / bit */
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#define INA231_BUS_MV(reg) ((reg) * 125 / 100)
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/* Power LSB : 25mW / current_lsb */
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#define INA231_POW_MW(reg) ((reg) * 25 * 1/*Current mA/LSB*/)
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/* Read INA231 register. */
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uint16_t ina231_read(uint8_t idx, uint8_t reg);
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/* Write INA231 register. */
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int ina231_write(uint8_t idx, uint8_t reg, uint16_t val);
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/* Set measurement parameters */
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int ina231_init(uint8_t idx, uint16_t config, uint16_t calib);
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/* Return bus voltage in milliVolts */
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int ina231_get_voltage(uint8_t idx);
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/* Return current in milliAmps */
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int ina231_get_current(uint8_t idx);
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/* Return power in milliWatts */
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int ina231_get_power(uint8_t idx);
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#endif /* INA231_H */
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