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