blob: 7b1a1dcfa6b421ab8b53564dcbe104b22eb6a980 [file] [log] [blame]
/*
* Copyright 2024 Google LLC
*
* SPDX-License-Identifier: Apache-2.0
*
* BQ25180 Datasheet: https://www.ti.com/lit/gpn/bq25180
*/
#define DT_DRV_COMPAT ti_bq25180
#include <zephyr/device.h>
#include <zephyr/drivers/charger.h>
#include <zephyr/drivers/i2c.h>
#include <zephyr/kernel.h>
#include <zephyr/logging/log.h>
#include <zephyr/sys/util.h>
LOG_MODULE_REGISTER(bq25180, CONFIG_CHARGER_LOG_LEVEL);
#define BQ25180_STAT0 0x00
#define BQ25180_STAT1 0x01
#define BQ25180_FLAG0 0x02
#define BQ25180_VBAT_CTRL 0x03
#define BQ25180_ICHG_CTRL 0x04
#define BQ25180_IC_CTRL 0x07
#define BQ25180_SHIP_RST 0x09
#define BQ25180_MASK_ID 0x0c
#define BQ25180_STAT0_CHG_STAT_MASK GENMASK(6, 5)
#define BQ25180_STAT0_CHG_STAT_NOT_CHARGING 0x00
#define BQ25180_STAT0_CHG_STAT_CONSTANT_CURRENT 0x01
#define BQ25180_STAT0_CHG_STAT_CONSTANT_VOLTAGE 0x02
#define BQ25180_STAT0_CHG_STAT_DONE 0x03
#define BQ25180_STAT0_VIN_PGOOD_STAT BIT(0)
#define BQ25180_ICHG_CHG_DIS BIT(7)
#define BQ25180_ICHG_MSK GENMASK(6, 0)
#define BQ25180_WATCHDOG_SEL_1_MSK GENMASK(1, 0)
#define BQ25180_WATCHDOG_DISABLE 0x03
#define BQ25180_DEVICE_ID_MSK GENMASK(3, 0)
#define BQ25180_DEVICE_ID 0x00
#define BQ25180_SHIP_RST_EN_RST_SHIP_MSK GENMASK(6, 5)
#define BQ25180_SHIP_RST_EN_RST_SHIP_ADAPTER 0x20
#define BQ25180_SHIP_RST_EN_RST_SHIP_BUTTON 0x40
/* Charging current limits */
#define BQ25180_CURRENT_MIN_MA 5
#define BQ25180_CURRENT_MAX_MA 1000
struct bq25180_config {
struct i2c_dt_spec i2c;
uint32_t initial_current_microamp;
};
/*
* For ICHG <= 35mA = ICHGCODE + 5mA
* For ICHG > 35mA = 40 + ((ICHGCODE-31)*10)mA.
* Maximum programmable current = 1000mA
*
* Return: value between 0 and 127, negative on error.
*/
static int bq25180_ma_to_ichg(uint32_t current_ma, uint8_t *ichg)
{
if (!IN_RANGE(current_ma, BQ25180_CURRENT_MIN_MA, BQ25180_CURRENT_MAX_MA)) {
LOG_WRN("charging current out of range: %dmA, "
"clamping to the nearest limit", current_ma);
}
current_ma = CLAMP(current_ma, BQ25180_CURRENT_MIN_MA, BQ25180_CURRENT_MAX_MA);
if (current_ma <= 35) {
*ichg = current_ma - 5;
return 0;
}
*ichg = (current_ma - 40) / 10 + 31;
return 0;
}
static uint32_t bq25180_ichg_to_ma(uint8_t ichg)
{
ichg &= BQ25180_ICHG_MSK;
if (ichg <= 30) {
return (ichg + 5);
}
return (ichg - 31) * 10 + 40;
}
static int bq25183_charge_enable(const struct device *dev, const bool enable)
{
const struct bq25180_config *cfg = dev->config;
uint8_t value = enable ? 0 : BQ25180_ICHG_CHG_DIS;
int ret;
ret = i2c_reg_update_byte_dt(&cfg->i2c, BQ25180_ICHG_CTRL,
BQ25180_ICHG_CHG_DIS, value);
if (ret < 0) {
return ret;
}
return 0;
}
static int bq25180_set_charge_current(const struct device *dev,
uint32_t const_charge_current_ua)
{
const struct bq25180_config *cfg = dev->config;
uint8_t val;
int ret;
ret = bq25180_ma_to_ichg(const_charge_current_ua / 1000, &val);
if (ret < 0) {
return ret;
}
ret = i2c_reg_update_byte_dt(&cfg->i2c, BQ25180_ICHG_CTRL,
BQ25180_ICHG_MSK, val);
if (ret < 0) {
return ret;
}
return 0;
}
static int bq25180_get_charge_current(const struct device *dev,
uint32_t *const_charge_current_ua)
{
const struct bq25180_config *cfg = dev->config;
uint8_t val;
int ret;
ret = i2c_reg_read_byte_dt(&cfg->i2c, BQ25180_ICHG_CTRL, &val);
if (ret < 0) {
return ret;
}
*const_charge_current_ua = bq25180_ichg_to_ma(val) * 1000;
return 0;
}
static int bq25180_get_online(const struct device *dev,
enum charger_online *online)
{
const struct bq25180_config *cfg = dev->config;
uint8_t val;
int ret;
ret = i2c_reg_read_byte_dt(&cfg->i2c, BQ25180_STAT0, &val);
if (ret < 0) {
return ret;
}
if ((val & BQ25180_STAT0_VIN_PGOOD_STAT) != 0x00) {
*online = CHARGER_ONLINE_FIXED;
} else {
*online = CHARGER_ONLINE_OFFLINE;
}
return 0;
}
static int bq25180_get_status(const struct device *dev,
enum charger_status *status)
{
const struct bq25180_config *cfg = dev->config;
uint8_t stat0;
uint8_t ichg_ctrl;
int ret;
ret = i2c_reg_read_byte_dt(&cfg->i2c, BQ25180_STAT0, &stat0);
if (ret < 0) {
return ret;
}
if ((stat0 & BQ25180_STAT0_VIN_PGOOD_STAT) == 0x00) {
*status = CHARGER_STATUS_DISCHARGING;
return 0;
}
ret = i2c_reg_read_byte_dt(&cfg->i2c, BQ25180_ICHG_CTRL, &ichg_ctrl);
if (ret < 0) {
return ret;
}
if ((ichg_ctrl & BQ25180_ICHG_CHG_DIS) != 0x00) {
*status = CHARGER_STATUS_NOT_CHARGING;
return 0;
}
switch (FIELD_GET(BQ25180_STAT0_CHG_STAT_MASK, stat0)) {
case BQ25180_STAT0_CHG_STAT_NOT_CHARGING:
*status = CHARGER_STATUS_NOT_CHARGING;
break;
case BQ25180_STAT0_CHG_STAT_CONSTANT_CURRENT:
case BQ25180_STAT0_CHG_STAT_CONSTANT_VOLTAGE:
*status = CHARGER_STATUS_CHARGING;
break;
case BQ25180_STAT0_CHG_STAT_DONE:
*status = CHARGER_STATUS_FULL;
break;
}
return 0;
}
static int bq25180_get_prop(const struct device *dev, charger_prop_t prop,
union charger_propval *val)
{
switch (prop) {
case CHARGER_PROP_ONLINE:
return bq25180_get_online(dev, &val->online);
case CHARGER_PROP_STATUS:
return bq25180_get_status(dev, &val->status);
case CHARGER_PROP_CONSTANT_CHARGE_CURRENT_UA:
return bq25180_get_charge_current(dev, &val->const_charge_current_ua);
default:
return -ENOTSUP;
}
}
static int bq25180_set_prop(const struct device *dev, charger_prop_t prop,
const union charger_propval *val)
{
switch (prop) {
case CHARGER_PROP_CONSTANT_CHARGE_CURRENT_UA:
return bq25180_set_charge_current(dev, val->const_charge_current_ua);
default:
return -ENOTSUP;
}
}
static const struct charger_driver_api bq25180_api = {
.get_property = bq25180_get_prop,
.set_property = bq25180_set_prop,
.charge_enable = bq25183_charge_enable,
};
static int bq25180_init(const struct device *dev)
{
const struct bq25180_config *cfg = dev->config;
uint8_t val;
int ret;
ret = i2c_reg_read_byte_dt(&cfg->i2c, BQ25180_MASK_ID, &val);
if (ret < 0) {
return ret;
}
val &= BQ25180_DEVICE_ID_MSK;
if (val != BQ25180_DEVICE_ID) {
LOG_ERR("Invalid device id: %02x", val);
return -EINVAL;
}
/* Disable the watchdog */
ret = i2c_reg_update_byte_dt(&cfg->i2c, BQ25180_IC_CTRL,
BQ25180_WATCHDOG_SEL_1_MSK,
BQ25180_WATCHDOG_DISABLE);
if (ret < 0) {
return ret;
}
if (cfg->initial_current_microamp > 0) {
ret = bq25180_set_charge_current(dev, cfg->initial_current_microamp);
if (ret < 0) {
return ret;
}
}
return 0;
}
#define CHARGER_BQ25180_INIT(inst) \
static const struct bq25180_config bq25180_config_##inst = { \
.i2c = I2C_DT_SPEC_INST_GET(inst), \
.initial_current_microamp = DT_INST_PROP( \
inst, constant_charge_current_max_microamp), \
}; \
\
DEVICE_DT_INST_DEFINE(inst, bq25180_init, NULL, NULL, \
&bq25180_config_##inst, POST_KERNEL, \
CONFIG_CHARGER_INIT_PRIORITY, \
&bq25180_api);
DT_INST_FOREACH_STATUS_OKAY(CHARGER_BQ25180_INIT)