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emul_sbs_gauge.c
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emul_sbs_gauge.c
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/*
* Copyright 2022 Google LLC
*
* SPDX-License-Identifier: Apache-2.0
*
* Emulator for SBS 1.1 compliant smart battery fuel gauge.
*/
#ifdef CONFIG_FUEL_GAUGE
#define DT_DRV_COMPAT sbs_sbs_gauge_new_api
#else
#define DT_DRV_COMPAT sbs_sbs_gauge
#endif /* CONFIG_FUEL_GAUGE */
#include <zephyr/logging/log.h>
LOG_MODULE_REGISTER(sbs_sbs_gauge);
#include <zephyr/device.h>
#include <zephyr/drivers/emul.h>
#include <zephyr/drivers/i2c.h>
#include <zephyr/drivers/i2c_emul.h>
#include <zephyr/sys/byteorder.h>
#include "sbs_gauge.h"
/** Run-time data used by the emulator */
struct sbs_gauge_emul_data {
uint16_t mfr_acc;
uint16_t mode;
int16_t at_rate;
};
/** Static configuration for the emulator */
struct sbs_gauge_emul_cfg {
/** I2C address of emulator */
uint16_t addr;
};
static int emul_sbs_gauge_reg_write(const struct emul *target, int reg, int val)
{
struct sbs_gauge_emul_data *data = target->data;
LOG_INF("write %x = %x", reg, val);
switch (reg) {
case SBS_GAUGE_CMD_MANUFACTURER_ACCESS:
data->mfr_acc = val;
break;
case SBS_GAUGE_CMD_BATTERY_MODE:
data->mode = val;
break;
case SBS_GAUGE_CMD_AR:
data->at_rate = val;
break;
default:
LOG_INF("Unknown write %x", reg);
return -EIO;
}
return 0;
}
static int emul_sbs_gauge_reg_read(const struct emul *target, int reg, int *val)
{
struct sbs_gauge_emul_data *data = target->data;
switch (reg) {
case SBS_GAUGE_CMD_MANUFACTURER_ACCESS:
*val = data->mfr_acc;
break;
case SBS_GAUGE_CMD_VOLTAGE:
case SBS_GAUGE_CMD_AVG_CURRENT:
case SBS_GAUGE_CMD_TEMP:
case SBS_GAUGE_CMD_ASOC:
case SBS_GAUGE_CMD_FULL_CAPACITY:
case SBS_GAUGE_CMD_REM_CAPACITY:
case SBS_GAUGE_CMD_NOM_CAPACITY:
case SBS_GAUGE_CMD_AVG_TIME2EMPTY:
case SBS_GAUGE_CMD_AVG_TIME2FULL:
case SBS_GAUGE_CMD_RUNTIME2EMPTY:
case SBS_GAUGE_CMD_CYCLE_COUNT:
case SBS_GAUGE_CMD_DESIGN_VOLTAGE:
case SBS_GAUGE_CMD_CURRENT:
case SBS_GAUGE_CMD_BATTERY_MODE:
case SBS_GAUGE_CMD_CHG_CURRENT:
case SBS_GAUGE_CMD_CHG_VOLTAGE:
case SBS_GAUGE_CMD_FLAGS:
case SBS_GAUGE_CMD_AR:
case SBS_GAUGE_CMD_ARTTF:
case SBS_GAUGE_CMD_ARTTE:
case SBS_GAUGE_CMD_AROK:
/* Arbitrary stub value. */
*val = 1;
break;
default:
LOG_ERR("Unknown register 0x%x read", reg);
return -EIO;
}
LOG_INF("read 0x%x = 0x%x", reg, *val);
return 0;
}
static int sbs_gauge_emul_transfer_i2c(const struct emul *target, struct i2c_msg *msgs,
int num_msgs, int addr)
{
/* Largely copied from emul_bmi160.c */
struct sbs_gauge_emul_data *data;
unsigned int val;
int reg;
int rc;
data = target->data;
__ASSERT_NO_MSG(msgs && num_msgs);
i2c_dump_msgs_rw("emul", msgs, num_msgs, addr, false);
switch (num_msgs) {
case 2:
if (msgs->flags & I2C_MSG_READ) {
LOG_ERR("Unexpected read");
return -EIO;
}
if (msgs->len != 1) {
LOG_ERR("Unexpected msg0 length %d", msgs->len);
return -EIO;
}
reg = msgs->buf[0];
/* Now process the 'read' part of the message */
msgs++;
if (msgs->flags & I2C_MSG_READ) {
switch (msgs->len - 1) {
case 1:
rc = emul_sbs_gauge_reg_read(target, reg, &val);
if (rc) {
/* Return before writing bad value to message buffer */
return rc;
}
/* SBS uses SMBus, which sends data in little-endian format. */
sys_put_le16(val, msgs->buf);
break;
default:
LOG_ERR("Unexpected msg1 length %d", msgs->len);
return -EIO;
}
} else {
/* We write a word (2 bytes by the SBS spec) */
if (msgs->len != 2) {
LOG_ERR("Unexpected msg1 length %d", msgs->len);
}
uint16_t value = sys_get_le16(msgs->buf);
rc = emul_sbs_gauge_reg_write(target, reg, value);
}
break;
default:
LOG_ERR("Invalid number of messages: %d", num_msgs);
return -EIO;
}
return rc;
}
static const struct i2c_emul_api sbs_gauge_emul_api_i2c = {
.transfer = sbs_gauge_emul_transfer_i2c,
};
/**
* Set up a new SBS_GAUGE emulator (I2C)
*
* @param emul Emulation information
* @param parent Device to emulate (must use sbs_gauge driver)
* @return 0 indicating success (always)
*/
static int emul_sbs_sbs_gauge_init(const struct emul *target, const struct device *parent)
{
ARG_UNUSED(target);
ARG_UNUSED(parent);
return 0;
}
/*
* Main instantiation macro. SBS Gauge Emulator only implemented for I2C
*/
#define SBS_GAUGE_EMUL(n) \
static struct sbs_gauge_emul_data sbs_gauge_emul_data_##n; \
static const struct sbs_gauge_emul_cfg sbs_gauge_emul_cfg_##n = { \
.addr = DT_INST_REG_ADDR(n), \
}; \
EMUL_DT_INST_DEFINE(n, emul_sbs_sbs_gauge_init, &sbs_gauge_emul_data_##n, \
&sbs_gauge_emul_cfg_##n, &sbs_gauge_emul_api_i2c, NULL)
DT_INST_FOREACH_STATUS_OKAY(SBS_GAUGE_EMUL)