399 lines
13 KiB
C
399 lines
13 KiB
C
/****************************************************************************
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* drivers/sensors/ina3221.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <stdlib.h>
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#include <assert.h>
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#include <errno.h>
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#include <debug.h>
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#include <string.h>
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#include <nuttx/kmalloc.h>
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#include <nuttx/fs/fs.h>
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#include <nuttx/i2c/i2c_master.h>
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#include <nuttx/sensors/ina3221.h>
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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#if !defined(CONFIG_I2C)
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# error i2c support required
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#endif
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#define INA3221_REG_CONFIG 0x00 /* See below */
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#define INA3221_REG_CH1_SHUNT_VOLTAGE 0x01 /* Shunt voltage in 40 uV units */
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#define INA3221_REG_CH1_BUS_VOLTAGE 0x02 /* Bus votlage in 8 mV units */
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#define INA3221_REG_CH2_SHUNT_VOLTAGE 0x03 /* Shunt voltage in 40 uV units */
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#define INA3221_REG_CH2_BUS_VOLTAGE 0x04 /* Bus votlage in 8 mV units */
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#define INA3221_REG_CH3_SHUNT_VOLTAGE 0x05 /* Shunt voltage in 40 uV units */
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#define INA3221_REG_CH3_BUS_VOLTAGE 0x06 /* Bus votlage in 8 mV units */
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#define INA3221_REG_CH1_CRIT_LIMIT 0x07 /* Critical Alert limit */
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#define INA3221_REG_CH1_WARN_LIMIT 0x08 /* Warning Alert limit */
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#define INA3221_REG_CH2_CRIT_LIMIT 0x09 /* Critical Alert limit */
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#define INA3221_REG_CH2_WARN_LIMIT 0x0A /* Warning Alert limit */
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#define INA3221_REG_CH3_CRIT_LIMIT 0x0B /* Critical Alert limit */
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#define INA3221_REG_CH3_WARN_LIMIT 0x0C /* Warning Alert limit */
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#define INA3221_REG_VSHUNT_SUM 0x0D /* Shunt Voltage Sum */
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#define INA3221_REG_VSHUNT_SUM_LIMIT 0x0E /* Shunt Voltage Sum Limit */
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#define INA3221_REG_MASKENABLE 0x0F /* Mask/Enable register */
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#define INA3221_REG_POWERVALID_UPPER 0x10 /* Power-Valid Upper Limit */
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#define INA3221_REG_POWERVALID_LOWER 0x11 /* Power-Valid Lower Limit */
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#define INA3221_REG_MANUFACTURER_ID 0xFE /* Always 0x5449 */
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#define INA3221_REG_DIE_ID 0xFF /* Always 0x3220 */
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#define INA3221_CONFIG_RST (1 << 15)
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#ifndef CONFIG_INA3221_I2C_FREQUENCY
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# define CONFIG_INA3221_I2C_FREQUENCY 400000
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#endif
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#define I2C_NOSTARTSTOP_MSGS 2
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#define I2C_NOSTARTSTOP_ADDRESS_MSG_INDEX 0
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#define I2C_NOSTARTSTOP_DATA_MSG_INDEX 1
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/****************************************************************************
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* Private Types
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****************************************************************************/
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struct ina3221_dev_s
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{
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FAR struct i2c_master_s *i2c; /* I2C interface */
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uint8_t addr; /* I2C address */
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uint16_t config; /* INA 3221 config shadow */
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int32_t shunt_resistor[3]; /* micro-ohms */
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};
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/****************************************************************************
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* Private Function Prototypes
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****************************************************************************/
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/* I2C Helpers */
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static int ina3221_write16(FAR struct ina3221_dev_s *priv,
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uint8_t regaddr,
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FAR uint16_t regvalue);
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static int ina3221_read16(FAR struct ina3221_dev_s *priv,
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uint8_t regaddr,
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FAR uint16_t *regvalue);
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static int ina3221_readpower(FAR struct ina3221_dev_s *priv,
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FAR struct ina3221_s *buffer);
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/* Character driver methods */
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static ssize_t ina3221_read(FAR struct file *filep, FAR char *buffer,
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size_t buflen);
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static ssize_t ina3221_write(FAR struct file *filep, FAR const char *buffer,
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size_t buflen);
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/****************************************************************************
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* Private Data
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****************************************************************************/
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static const struct file_operations g_ina3221fops =
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{
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NULL, /* open */
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NULL, /* close */
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ina3221_read, /* read */
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ina3221_write, /* write */
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};
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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static int ina3221_access(FAR struct ina3221_dev_s *priv,
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uint8_t start_register_address, bool reading,
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FAR uint8_t *register_value, uint8_t data_length)
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{
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struct i2c_msg_s msg[I2C_NOSTARTSTOP_MSGS];
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int ret;
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msg[I2C_NOSTARTSTOP_ADDRESS_MSG_INDEX].frequency =
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CONFIG_INA3221_I2C_FREQUENCY;
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msg[I2C_NOSTARTSTOP_ADDRESS_MSG_INDEX].addr = priv->addr;
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msg[I2C_NOSTARTSTOP_ADDRESS_MSG_INDEX].flags = 0;
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msg[I2C_NOSTARTSTOP_ADDRESS_MSG_INDEX].buffer = &start_register_address;
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msg[I2C_NOSTARTSTOP_ADDRESS_MSG_INDEX].length = 1;
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msg[I2C_NOSTARTSTOP_DATA_MSG_INDEX].addr =
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msg[I2C_NOSTARTSTOP_ADDRESS_MSG_INDEX].addr;
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msg[I2C_NOSTARTSTOP_DATA_MSG_INDEX].flags =
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reading ? I2C_M_READ : 0;
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msg[I2C_NOSTARTSTOP_DATA_MSG_INDEX].buffer = register_value;
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msg[I2C_NOSTARTSTOP_DATA_MSG_INDEX].length = data_length;
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ret = I2C_TRANSFER(priv->i2c, msg, I2C_NOSTARTSTOP_MSGS);
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sninfo("start_register_address: "
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"0x%02X data_length: %d register_value: 0x%02x (0x%04x) ret: %d\n",
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start_register_address, data_length, *register_value,
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*((FAR uint16_t *)register_value), ret);
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return ret;
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}
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static int ina3221_read16(FAR struct ina3221_dev_s *priv, uint8_t regaddr,
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FAR uint16_t *regvalue)
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{
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uint8_t buf[2];
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int ret = ina3221_access(priv, regaddr, true, buf, 2);
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if (ret == 0)
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{
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*regvalue = ((uint16_t)buf[0] << 8) | (uint16_t)buf[1];
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}
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return ret;
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}
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static int ina3221_write16(FAR struct ina3221_dev_s *priv, uint8_t regaddr,
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FAR uint16_t regvalue)
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{
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uint8_t buf[2];
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int ret;
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buf[0] = (regvalue >> 8) & 0xff;
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buf[1] = regvalue & 0xff;
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ret = ina3221_access(priv, regaddr, false, buf, 2);
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return ret;
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}
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/****************************************************************************
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* Name: ina3221_readpower
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*
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* Description:
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* Read the current and voltage register with special scaling
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*
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****************************************************************************/
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static int ina3221_readpower(FAR struct ina3221_dev_s *priv,
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FAR struct ina3221_s *buffer)
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{
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uint16_t reg;
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int16_t sreg;
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int64_t tmp;
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int i;
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int ret;
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/* Loop for all 3 channels on the device */
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for (i = 0; i < 3; i++)
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{
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if (priv->config & (INA3221_CONFIG_CH1_EN >> i))
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{
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/* Read the raw bus voltage */
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ret = ina3221_read16(priv, (INA3221_REG_CH1_BUS_VOLTAGE + i * 2),
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®);
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if (ret < 0)
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{
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snerr("ERROR: ina3221_read16 failed: %d\n", ret);
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return ret;
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}
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/* Convert register value to bus voltage */
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sreg = (int16_t)reg;
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sreg >>= 3; /* 3 LSB of reg are not used,
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* but the value is signed */
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buffer->ch[i].voltage = ((uint32_t)sreg) * 8000LU;
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/* Read the raw shunt voltage */
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ret = ina3221_read16(priv, (INA3221_REG_CH1_SHUNT_VOLTAGE + i * 2),
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®);
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if (ret < 0)
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{
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snerr("ERROR: ina3221_read16 failed: %d\n", ret);
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return ret;
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}
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/* Convert register value to shunt voltage */
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sreg = (int16_t)reg;
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sreg >>= 3; /* 3 LSB of reg are not used,
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* but the value is signed */
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tmp = ((int64_t)(int16_t)sreg) * 40LL; /* micro volts across shunt */
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/* Convert shunt voltage to current across the shunt resistor.
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* I(uA) = U(uV)/R(ohms)
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* = U(uV)/(R(uohms)/1000000)
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* = U(uV) * 1000000 / R(uohms)
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* We use a temporary 64-bit accumulator to avoid overflows.
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*/
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tmp = tmp * 1000000LL;
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tmp = tmp / (int64_t)priv->shunt_resistor[i];
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buffer->ch[i].current = (int32_t)tmp;
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sninfo("Voltage: %u uV, Current: %d uA\n",
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buffer->ch[i].voltage, buffer->ch[i].current);
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}
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}
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return OK;
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}
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/****************************************************************************
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* Name: ina3221_read
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****************************************************************************/
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static ssize_t ina3221_read(FAR struct file *filep, FAR char *buffer,
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size_t buflen)
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{
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FAR struct inode *inode = filep->f_inode;
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FAR struct ina3221_dev_s *priv = inode->i_private;
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FAR struct ina3221_s *ptr;
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ssize_t nsamples;
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int i;
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int ret;
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/* How many samples were requested to get? */
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nsamples = buflen / sizeof(struct ina3221_s);
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ptr = (FAR struct ina3221_s *)buffer;
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sninfo("buflen: %d nsamples: %d\n", buflen, nsamples);
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/* Get the requested number of samples */
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for (i = 0; i < nsamples; i++)
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{
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struct ina3221_s pwr;
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/* Read the next struct ina3221_s power value */
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ret = ina3221_readpower(priv, &pwr);
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if (ret < 0)
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{
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snerr("ERROR: ina3221_readpower failed: %d\n", ret);
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return (ssize_t)ret;
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}
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/* Save the temperature value in the user buffer */
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*ptr++ = pwr;
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}
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return nsamples * sizeof(struct ina3221_s);
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}
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/****************************************************************************
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* Name: ina3221_write
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****************************************************************************/
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static ssize_t ina3221_write(FAR struct file *filep, FAR const char *buffer,
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size_t buflen)
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{
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return -ENOSYS;
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}
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: ina3221_register
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*
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* Description:
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* Register the INA3221 character device as 'devpath'
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*
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* Input Parameters:
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* devpath - The full path to the driver to register. E.g., "/dev/pwrmntr0"
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* i2c - An instance of the I2C interface to use to communicate with
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* INA3221
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* config - Configuration including I2C address, shunt values, and INA3221
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* configuration mask.
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*
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* Returned Value:
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* Zero (OK) on success; a negated errno value on failure.
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*
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****************************************************************************/
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int ina3221_register(FAR const char *devpath, FAR struct i2c_master_s *i2c,
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FAR const struct ina3221_config_s *config)
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{
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FAR struct ina3221_dev_s *priv;
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int ret = 0;
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/* Sanity check */
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DEBUGASSERT(i2c != NULL);
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/* Initialize the ina3221 device structure */
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priv = (FAR struct ina3221_dev_s *)
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kmm_malloc(sizeof(struct ina3221_dev_s));
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if (priv == NULL)
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{
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snerr("ERROR: Failed to allocate instance\n");
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return -ENOMEM;
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}
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priv->i2c = i2c;
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priv->addr = config->addr;
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/* Save the config (except opmode) */
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priv->config = config->cfgreg & ~(INA3221_CONFIG_RST);
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/* Copy the shunt resistor values */
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memcpy(priv->shunt_resistor, config->shunt_resistor, 3 * sizeof(int32_t));
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/* Apply config, keep chip switched off */
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ret = ina3221_write16(priv, INA3221_REG_CONFIG, priv->config);
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if (ret < 0)
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{
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snerr("ERROR: Failed to apply config: %d\n", ret);
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goto errout;
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}
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/* Register the character driver */
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ret = register_driver(devpath, &g_ina3221fops, 0666, priv);
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if (ret < 0)
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{
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snerr("ERROR: Failed to register driver: %d\n", ret);
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goto errout;
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}
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sninfo("(addr=0x%02x) registered at %s\n", priv->addr, devpath);
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return ret;
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errout:
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kmm_free(priv);
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return ret;
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}
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