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Diffstat (limited to 'driver/ina231.h')
| -rw-r--r-- | driver/ina231.h | 90 |
1 files changed, 90 insertions, 0 deletions
diff --git a/driver/ina231.h b/driver/ina231.h new file mode 100644 index 0000000000..56ccb27d4e --- /dev/null +++ b/driver/ina231.h @@ -0,0 +1,90 @@ +/* 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 */ |