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sbs_gauge.c
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sbs_gauge.c
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/*
* Copyright (c) 2022 Leica Geosystems AG
*
* Copyright 2022 Google LLC
*
* SPDX-License-Identifier: Apache-2.0
*/
#define DT_DRV_COMPAT sbs_sbs_gauge_new_api
#include "sbs_gauge.h"
#include <zephyr/drivers/fuel_gauge.h>
#include <zephyr/drivers/i2c.h>
#include <zephyr/logging/log.h>
#include <zephyr/sys/byteorder.h>
LOG_MODULE_REGISTER(sbs_gauge);
static int sbs_cmd_reg_read(const struct device *dev, uint8_t reg_addr, uint16_t *val)
{
const struct sbs_gauge_config *cfg;
uint8_t i2c_data[2];
int status;
cfg = dev->config;
status = i2c_burst_read_dt(&cfg->i2c, reg_addr, i2c_data, ARRAY_SIZE(i2c_data));
if (status < 0) {
LOG_ERR("Unable to read register");
return status;
}
*val = sys_get_le16(i2c_data);
return 0;
}
static int sbs_cmd_reg_write(const struct device *dev, uint8_t reg_addr, uint16_t val)
{
const struct sbs_gauge_config *config = dev->config;
uint8_t buf[2];
sys_put_le16(val, buf);
return i2c_burst_write_dt(&config->i2c, reg_addr, buf, sizeof(buf));
}
static int sbs_gauge_get_prop(const struct device *dev, struct fuel_gauge_get_property *prop)
{
int rc = 0;
uint16_t val = 0;
switch (prop->property_type) {
case FUEL_GAUGE_AVG_CURRENT:
rc = sbs_cmd_reg_read(dev, SBS_GAUGE_CMD_AVG_CURRENT, &val);
prop->value.avg_current = val * 1000;
break;
case FUEL_GAUGE_CYCLE_COUNT:
rc = sbs_cmd_reg_read(dev, SBS_GAUGE_CMD_CYCLE_COUNT, &val);
prop->value.cycle_count = val;
break;
case FUEL_GAUGE_CURRENT:
rc = sbs_cmd_reg_read(dev, SBS_GAUGE_CMD_CURRENT, &val);
prop->value.current = val * 1000;
break;
case FUEL_GAUGE_FULL_CHARGE_CAPACITY:
rc = sbs_cmd_reg_read(dev, SBS_GAUGE_CMD_FULL_CAPACITY, &val);
prop->value.full_charge_capacity = val * 1000;
break;
case FUEL_GAUGE_REMAINING_CAPACITY:
rc = sbs_cmd_reg_read(dev, SBS_GAUGE_CMD_REM_CAPACITY, &val);
prop->value.remaining_capacity = val * 1000;
break;
case FUEL_GAUGE_RUNTIME_TO_EMPTY:
rc = sbs_cmd_reg_read(dev, SBS_GAUGE_CMD_RUNTIME2EMPTY, &val);
prop->value.runtime_to_empty = val;
break;
case FUEL_GAUGE_RUNTIME_TO_FULL:
rc = sbs_cmd_reg_read(dev, SBS_GAUGE_CMD_AVG_TIME2FULL, &val);
prop->value.runtime_to_empty = val;
break;
case FUEL_GAUGE_SBS_MFR_ACCESS:
rc = sbs_cmd_reg_read(dev, SBS_GAUGE_CMD_MANUFACTURER_ACCESS, &val);
prop->value.sbs_mfr_access_word = val;
break;
case FUEL_GAUGE_STATE_OF_CHARGE:
rc = sbs_cmd_reg_read(dev, SBS_GAUGE_CMD_ASOC, &val);
prop->value.state_of_charge = val;
break;
case FUEL_GAUGE_TEMPERATURE:
rc = sbs_cmd_reg_read(dev, SBS_GAUGE_CMD_TEMP, &val);
prop->value.temperature = val;
break;
case FUEL_GAUGE_VOLTAGE:
rc = sbs_cmd_reg_read(dev, SBS_GAUGE_CMD_VOLTAGE, &val);
prop->value.voltage = val * 1000;
break;
case FUEL_GAUGE_SBS_MODE:
rc = sbs_cmd_reg_read(dev, SBS_GAUGE_CMD_BATTERY_MODE, &val);
prop->value.sbs_mode = val;
break;
case FUEL_GAUGE_CHARGE_CURRENT:
rc = sbs_cmd_reg_read(dev, SBS_GAUGE_CMD_CHG_CURRENT, &val);
prop->value.chg_current = val;
break;
case FUEL_GAUGE_CHARGE_VOLTAGE:
rc = sbs_cmd_reg_read(dev, SBS_GAUGE_CMD_CHG_VOLTAGE, &val);
prop->value.chg_voltage = val;
break;
case FUEL_GAUGE_STATUS:
rc = sbs_cmd_reg_read(dev, SBS_GAUGE_CMD_FLAGS, &val);
prop->value.fg_status = val;
break;
case FUEL_GAUGE_DESIGN_CAPACITY:
rc = sbs_cmd_reg_read(dev, SBS_GAUGE_CMD_NOM_CAPACITY, &val);
prop->value.design_cap = val;
break;
case FUEL_GAUGE_DESIGN_VOLTAGE:
rc = sbs_cmd_reg_read(dev, SBS_GAUGE_CMD_DESIGN_VOLTAGE, &val);
prop->value.design_volt = val;
break;
case FUEL_GAUGE_SBS_ATRATE:
rc = sbs_cmd_reg_read(dev, SBS_GAUGE_CMD_AR, &val);
prop->value.sbs_at_rate = val;
break;
case FUEL_GAUGE_SBS_ATRATE_TIME_TO_FULL:
rc = sbs_cmd_reg_read(dev, SBS_GAUGE_CMD_ARTTF, &val);
prop->value.sbs_at_rate_time_to_full = val;
break;
case FUEL_GAUGE_SBS_ATRATE_TIME_TO_EMPTY:
rc = sbs_cmd_reg_read(dev, SBS_GAUGE_CMD_ARTTE, &val);
prop->value.sbs_at_rate_time_to_empty = val;
break;
case FUEL_GAUGE_SBS_ATRATE_OK:
rc = sbs_cmd_reg_read(dev, SBS_GAUGE_CMD_AROK, &val);
prop->value.sbs_at_rate_ok = val;
break;
default:
rc = -ENOTSUP;
}
prop->status = rc;
return rc;
}
static int sbs_gauge_set_prop(const struct device *dev, struct fuel_gauge_set_property *prop)
{
int rc = 0;
uint16_t val = 0;
switch (prop->property_type) {
case FUEL_GAUGE_SBS_MFR_ACCESS:
rc = sbs_cmd_reg_write(dev, SBS_GAUGE_CMD_MANUFACTURER_ACCESS,
prop->value.sbs_mfr_access_word);
prop->value.sbs_mfr_access_word = val;
break;
case FUEL_GAUGE_SBS_MODE:
rc = sbs_cmd_reg_write(dev, SBS_GAUGE_CMD_BATTERY_MODE, prop->value.sbs_mode);
prop->value.sbs_mode = val;
break;
case FUEL_GAUGE_SBS_ATRATE:
rc = sbs_cmd_reg_write(dev, SBS_GAUGE_CMD_AR, prop->value.sbs_at_rate);
prop->value.sbs_at_rate = val;
break;
default:
rc = -ENOTSUP;
}
prop->status = rc;
return rc;
}
static int sbs_gauge_get_props(const struct device *dev, struct fuel_gauge_get_property *props,
size_t len)
{
int err_count = 0;
for (int i = 0; i < len; i++) {
int ret = sbs_gauge_get_prop(dev, props + i);
err_count += ret ? 1 : 0;
}
err_count = (err_count == len) ? -1 : err_count;
return err_count;
}
static int sbs_gauge_set_props(const struct device *dev, struct fuel_gauge_set_property *props,
size_t len)
{
int err_count = 0;
for (int i = 0; i < len; i++) {
int ret = sbs_gauge_set_prop(dev, props + i);
err_count += ret ? 1 : 0;
}
err_count = (err_count == len) ? -1 : err_count;
return err_count;
}
/**
* @brief initialize the fuel gauge
*
* @return 0 for success
*/
static int sbs_gauge_init(const struct device *dev)
{
const struct sbs_gauge_config *cfg;
cfg = dev->config;
if (!device_is_ready(cfg->i2c.bus)) {
LOG_ERR("Bus device is not ready");
return -ENODEV;
}
return 0;
}
static const struct fuel_gauge_driver_api sbs_gauge_driver_api = {
.get_property = &sbs_gauge_get_props,
.set_property = &sbs_gauge_set_props,
};
/* FIXME: fix init priority */
#define SBS_GAUGE_INIT(index) \
\
static const struct sbs_gauge_config sbs_gauge_config_##index = { \
.i2c = I2C_DT_SPEC_INST_GET(index), \
}; \
\
DEVICE_DT_INST_DEFINE(index, &sbs_gauge_init, NULL, NULL, &sbs_gauge_config_##index, \
POST_KERNEL, CONFIG_FUEL_GAUGE_INIT_PRIORITY, &sbs_gauge_driver_api);
DT_INST_FOREACH_STATUS_OKAY(SBS_GAUGE_INIT)