288 lines
7.1 KiB
C
288 lines
7.1 KiB
C
/*
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* Copyright 2023 Grinn
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#define DT_DRV_COMPAT maxim_max20335_charger
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#include <zephyr/device.h>
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#include <zephyr/drivers/charger.h>
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#include <zephyr/drivers/i2c.h>
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#include <zephyr/kernel.h>
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#include <zephyr/sys/util.h>
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#include <zephyr/sys/linear_range.h>
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#include "zephyr/logging/log.h"
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LOG_MODULE_REGISTER(max20335_charger);
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#define MAX20335_REG_STATUS_A 0x02
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#define MAX20335_REG_ILIMCNTL 0x09
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#define MAX20335_REG_CHG_CNTL_A 0x0A
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#define MAX20335_CHGCNTLA_BAT_REG_CFG_MASK GENMASK(4, 1)
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#define MAX20335_ILIMCNTL_MASK GENMASK(1, 0)
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#define MAX20335_STATUS_A_CHG_STAT_MASK GENMASK(2, 0)
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#define MAX20335_CHRG_EN_MASK BIT(0)
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#define MAX20335_CHRG_EN BIT(0)
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#define MAX20335_REG_CVC_VREG_MIN_UV 4050000U
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#define MAX20335_REG_CVC_VREG_STEP_UV 50000U
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#define MAX20335_REG_CVC_VREG_MIN_IDX 0x0U
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#define MAX20335_REG_CVC_VREG_MAX_IDX 0x0CU
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struct charger_max20335_config {
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struct i2c_dt_spec bus;
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uint32_t max_ichg_ua;
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uint32_t max_vreg_uv;
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};
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enum {
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MAX20335_CHARGER_OFF,
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MAX20335_CHARGING_SUSPENDED_DUE_TO_TEMPERATURE,
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MAX20335_PRE_CHARGE_IN_PROGRESS,
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MAX20335_FAST_CHARGE_IN_PROGRESS_1,
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MAX20335_FAST_CHARGE_IN_PROGRESS_2,
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MAX20335_MAINTAIN_CHARGE_IN_PROGRESS,
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MAX20335_MAIN_CHARGER_TIMER_DONE,
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MAX20335_CHARGER_FAULT_CONDITION,
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};
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static const struct linear_range charger_uv_range =
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LINEAR_RANGE_INIT(MAX20335_REG_CVC_VREG_MIN_UV,
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MAX20335_REG_CVC_VREG_STEP_UV,
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MAX20335_REG_CVC_VREG_MIN_IDX,
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MAX20335_REG_CVC_VREG_MAX_IDX);
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static int max20335_get_status(const struct device *dev, enum charger_status *status)
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{
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const struct charger_max20335_config *const config = dev->config;
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uint8_t val;
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int ret;
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ret = i2c_reg_read_byte_dt(&config->bus, MAX20335_REG_STATUS_A, &val);
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if (ret) {
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return ret;
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}
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val = FIELD_GET(MAX20335_STATUS_A_CHG_STAT_MASK, val);
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switch (val) {
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case MAX20335_CHARGER_OFF:
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__fallthrough;
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case MAX20335_CHARGING_SUSPENDED_DUE_TO_TEMPERATURE:
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__fallthrough;
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case MAX20335_CHARGER_FAULT_CONDITION:
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*status = CHARGER_STATUS_NOT_CHARGING;
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break;
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case MAX20335_PRE_CHARGE_IN_PROGRESS:
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__fallthrough;
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case MAX20335_FAST_CHARGE_IN_PROGRESS_1:
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__fallthrough;
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case MAX20335_FAST_CHARGE_IN_PROGRESS_2:
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__fallthrough;
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case MAX20335_MAINTAIN_CHARGE_IN_PROGRESS:
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*status = CHARGER_STATUS_CHARGING;
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break;
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case MAX20335_MAIN_CHARGER_TIMER_DONE:
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*status = CHARGER_STATUS_FULL;
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break;
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default:
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*status = CHARGER_STATUS_UNKNOWN;
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break;
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};
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return 0;
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}
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static int max20335_set_constant_charge_voltage(const struct device *dev,
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uint32_t voltage_uv)
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{
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const struct charger_max20335_config *const config = dev->config;
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uint16_t idx;
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uint8_t val;
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int ret;
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if (voltage_uv > config->max_vreg_uv) {
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LOG_WRN("Exceeded max constant charge voltage!");
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return -EINVAL;
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}
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ret = linear_range_get_index(&charger_uv_range, voltage_uv, &idx);
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if (ret == -EINVAL) {
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return ret;
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}
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val = FIELD_PREP(MAX20335_CHGCNTLA_BAT_REG_CFG_MASK, idx);
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return i2c_reg_update_byte_dt(&config->bus,
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MAX20335_REG_CHG_CNTL_A,
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MAX20335_CHGCNTLA_BAT_REG_CFG_MASK,
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val);
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}
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static int max20335_set_constant_charge_current(const struct device *dev,
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uint32_t current_ua)
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{
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const struct charger_max20335_config *const config = dev->config;
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uint8_t val;
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if (current_ua > config->max_ichg_ua) {
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LOG_WRN("Exceeded max constant charge current!");
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return -EINVAL;
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}
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switch (current_ua) {
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case 0:
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val = 0x00;
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break;
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case 100000:
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val = 0x01;
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break;
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case 500000:
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val = 0x02;
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break;
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case 1000000:
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val = 0x03;
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break;
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default:
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return -ENOTSUP;
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};
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val = FIELD_PREP(MAX20335_ILIMCNTL_MASK, val);
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return i2c_reg_update_byte_dt(&config->bus,
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MAX20335_REG_ILIMCNTL,
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MAX20335_ILIMCNTL_MASK,
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val);
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}
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static int max20335_get_constant_charge_current(const struct device *dev,
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uint32_t *current_ua)
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{
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const struct charger_max20335_config *const config = dev->config;
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uint8_t val;
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int ret;
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ret = i2c_reg_read_byte_dt(&config->bus, MAX20335_REG_ILIMCNTL, &val);
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if (ret) {
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return ret;
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}
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switch (val) {
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case 0x00:
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*current_ua = 0;
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break;
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case 0x01:
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*current_ua = 100000;
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break;
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case 0x02:
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*current_ua = 500000;
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break;
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case 0x03:
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*current_ua = 1000000;
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break;
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default:
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return -ENOTSUP;
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};
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return 0;
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}
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static int max20335_get_constant_charge_voltage(const struct device *dev,
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uint32_t *current_uv)
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{
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const struct charger_max20335_config *const config = dev->config;
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uint8_t val;
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int ret;
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ret = i2c_reg_read_byte_dt(&config->bus, MAX20335_REG_CHG_CNTL_A, &val);
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if (ret) {
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return ret;
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}
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val = FIELD_GET(MAX20335_CHGCNTLA_BAT_REG_CFG_MASK, val);
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return linear_range_get_value(&charger_uv_range, val, current_uv);
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}
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static int max20335_set_enabled(const struct device *dev, bool enable)
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{
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const struct charger_max20335_config *const config = dev->config;
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return i2c_reg_update_byte_dt(&config->bus,
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MAX20335_REG_CHG_CNTL_A,
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MAX20335_CHRG_EN_MASK,
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enable ? MAX20335_CHRG_EN : 0);
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}
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static int max20335_get_prop(const struct device *dev, charger_prop_t prop,
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union charger_propval *val)
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{
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switch (prop) {
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case CHARGER_PROP_STATUS:
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return max20335_get_status(dev, &val->status);
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case CHARGER_PROP_CONSTANT_CHARGE_CURRENT_UA:
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return max20335_get_constant_charge_current(dev,
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&val->const_charge_current_ua);
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case CHARGER_PROP_CONSTANT_CHARGE_VOLTAGE_UV:
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return max20335_get_constant_charge_voltage(dev,
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&val->const_charge_voltage_uv);
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default:
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return -ENOTSUP;
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}
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}
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static int max20335_set_prop(const struct device *dev, charger_prop_t prop,
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const union charger_propval *val)
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{
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switch (prop) {
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case CHARGER_PROP_STATUS:
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switch (val->status) {
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case CHARGER_STATUS_CHARGING:
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return max20335_set_enabled(dev, true);
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case CHARGER_STATUS_NOT_CHARGING:
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return max20335_set_enabled(dev, false);
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default:
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return -ENOTSUP;
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}
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case CHARGER_PROP_CONSTANT_CHARGE_CURRENT_UA:
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return max20335_set_constant_charge_current(dev,
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val->const_charge_current_ua);
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case CHARGER_PROP_CONSTANT_CHARGE_VOLTAGE_UV:
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return max20335_set_constant_charge_voltage(dev,
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val->const_charge_voltage_uv);
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default:
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return -ENOTSUP;
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}
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}
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static int max20335_init(const struct device *dev)
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{
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const struct charger_max20335_config *config = dev->config;
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if (!i2c_is_ready_dt(&config->bus)) {
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return -ENODEV;
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}
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return 0;
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}
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static const struct charger_driver_api max20335_driver_api = {
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.get_property = max20335_get_prop,
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.set_property = max20335_set_prop,
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};
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#define MAX20335_DEFINE(inst) \
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static const struct charger_max20335_config charger_max20335_config_##inst = { \
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.bus = I2C_DT_SPEC_GET(DT_INST_PARENT(inst)), \
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.max_ichg_ua = DT_INST_PROP(inst, constant_charge_current_max_microamp), \
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.max_vreg_uv = DT_INST_PROP(inst, constant_charge_voltage_max_microvolt), \
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}; \
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\
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DEVICE_DT_INST_DEFINE(inst, &max20335_init, NULL, NULL, \
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&charger_max20335_config_##inst, \
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POST_KERNEL, CONFIG_MFD_INIT_PRIORITY, \
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&max20335_driver_api);
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DT_INST_FOREACH_STATUS_OKAY(MAX20335_DEFINE)
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