blob: 9017e1e60b8471d20dcf793f1ef571bcf707a30b [file] [log] [blame]
/*
* Copyright 2023 Cirrus Logic, Inc.
*
* SPDX-License-Identifier: Apache-2.0
*/
#define DT_DRV_COMPAT sbs_sbs_charger
#include <zephyr/drivers/charger.h>
#include <zephyr/drivers/i2c.h>
#include <zephyr/logging/log.h>
#include <zephyr/sys/byteorder.h>
#include "sbs_charger.h"
struct sbs_charger_config {
struct i2c_dt_spec i2c;
};
LOG_MODULE_REGISTER(sbs_charger);
static int sbs_cmd_reg_read(const struct device *dev, uint8_t reg_addr, uint16_t *val)
{
const struct sbs_charger_config *cfg;
uint8_t i2c_data[2];
int status;
cfg = dev->config;
status = i2c_burst_read_dt(&cfg->i2c, reg_addr, i2c_data, sizeof(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_charger_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_cmd_reg_update(const struct device *dev, uint8_t reg_addr, uint16_t mask,
uint16_t val)
{
uint16_t old_val, new_val;
int ret;
ret = sbs_cmd_reg_read(dev, SBS_CHARGER_REG_STATUS, &old_val);
if (ret < 0) {
return ret;
}
new_val = (old_val & ~mask) | (val & mask);
if (new_val == old_val) {
return 0;
}
return sbs_cmd_reg_write(dev, reg_addr, new_val);
}
static int sbs_charger_charge_enable(const struct device *dev, const bool enable)
{
uint16_t reg_val;
if (!enable) {
reg_val = SBS_CHARGER_MODE_INHIBIT_CHARGE;
} else {
reg_val = 0;
}
return sbs_cmd_reg_update(dev, SBS_CHARGER_REG_CHARGER_MODE,
SBS_CHARGER_MODE_INHIBIT_CHARGE, reg_val);
}
static int sbs_charger_get_prop(const struct device *dev, const charger_prop_t prop,
union charger_propval *val)
{
uint16_t reg_val;
int ret;
switch (prop) {
case CHARGER_PROP_ONLINE:
ret = sbs_cmd_reg_read(dev, SBS_CHARGER_REG_STATUS, &reg_val);
if (ret < 0) {
return ret;
}
if (reg_val & SBS_CHARGER_STATUS_AC_PRESENT) {
val->online = CHARGER_ONLINE_FIXED;
} else {
val->online = CHARGER_ONLINE_OFFLINE;
}
return 0;
case CHARGER_PROP_PRESENT:
ret = sbs_cmd_reg_read(dev, SBS_CHARGER_REG_STATUS, &reg_val);
if (ret < 0) {
return ret;
}
if (reg_val & SBS_CHARGER_STATUS_BATTERY_PRESENT) {
val->present = true;
} else {
val->present = false;
}
return 0;
case CHARGER_PROP_STATUS:
ret = sbs_cmd_reg_read(dev, SBS_CHARGER_REG_STATUS, &reg_val);
if (ret < 0) {
return ret;
}
if (!(reg_val & SBS_CHARGER_STATUS_BATTERY_PRESENT)) {
val->status = CHARGER_STATUS_NOT_CHARGING;
} else if (reg_val & SBS_CHARGER_STATUS_AC_PRESENT &&
!(reg_val & SBS_CHARGER_STATUS_CHARGE_INHIBITED)) {
val->status = CHARGER_STATUS_CHARGING;
} else {
val->status = CHARGER_STATUS_DISCHARGING;
}
return 0;
default:
return -ENOTSUP;
}
}
static int sbs_charger_set_prop(const struct device *dev, const charger_prop_t prop,
const union charger_propval *val)
{
return -ENOTSUP;
}
/**
* @brief initialize the charger
*
* @return 0 for success
*/
static int sbs_charger_init(const struct device *dev)
{
const struct sbs_charger_config *cfg = dev->config;
if (!i2c_is_ready_dt(&cfg->i2c)) {
LOG_ERR("Bus device is not ready");
return -ENODEV;
}
return 0;
}
static const struct charger_driver_api sbs_charger_driver_api = {
.get_property = &sbs_charger_get_prop,
.set_property = &sbs_charger_set_prop,
.charge_enable = &sbs_charger_charge_enable,
};
#define SBS_CHARGER_INIT(inst) \
\
static const struct sbs_charger_config sbs_charger_config_##inst = { \
.i2c = I2C_DT_SPEC_INST_GET(inst), \
}; \
\
DEVICE_DT_INST_DEFINE(inst, &sbs_charger_init, NULL, NULL, &sbs_charger_config_##inst, \
POST_KERNEL, CONFIG_CHARGER_INIT_PRIORITY, &sbs_charger_driver_api);
DT_INST_FOREACH_STATUS_OKAY(SBS_CHARGER_INIT)