473 lines
12 KiB
C
473 lines
12 KiB
C
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// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Battery charger driver for RT5033
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*
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* Copyright (C) 2014 Samsung Electronics, Co., Ltd.
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* Author: Beomho Seo <beomho.seo@samsung.com>
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*/
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#include <linux/module.h>
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#include <linux/of_device.h>
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#include <linux/platform_device.h>
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#include <linux/power_supply.h>
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#include <linux/regmap.h>
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#include <linux/mfd/rt5033-private.h>
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struct rt5033_charger_data {
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unsigned int pre_uamp;
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unsigned int pre_uvolt;
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unsigned int const_uvolt;
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unsigned int eoc_uamp;
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unsigned int fast_uamp;
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};
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struct rt5033_charger {
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struct device *dev;
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struct regmap *regmap;
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struct power_supply *psy;
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struct rt5033_charger_data *chg;
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};
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static int rt5033_get_charger_state(struct rt5033_charger *charger)
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{
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struct regmap *regmap = charger->regmap;
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unsigned int reg_data;
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int state;
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if (!regmap)
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return POWER_SUPPLY_STATUS_UNKNOWN;
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regmap_read(regmap, RT5033_REG_CHG_STAT, ®_data);
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switch (reg_data & RT5033_CHG_STAT_MASK) {
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case RT5033_CHG_STAT_DISCHARGING:
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state = POWER_SUPPLY_STATUS_DISCHARGING;
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break;
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case RT5033_CHG_STAT_CHARGING:
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state = POWER_SUPPLY_STATUS_CHARGING;
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break;
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case RT5033_CHG_STAT_FULL:
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state = POWER_SUPPLY_STATUS_FULL;
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break;
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case RT5033_CHG_STAT_NOT_CHARGING:
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state = POWER_SUPPLY_STATUS_NOT_CHARGING;
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break;
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default:
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state = POWER_SUPPLY_STATUS_UNKNOWN;
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}
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return state;
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}
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static int rt5033_get_charger_type(struct rt5033_charger *charger)
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{
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struct regmap *regmap = charger->regmap;
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unsigned int reg_data;
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int state;
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regmap_read(regmap, RT5033_REG_CHG_STAT, ®_data);
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switch (reg_data & RT5033_CHG_STAT_TYPE_MASK) {
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case RT5033_CHG_STAT_TYPE_FAST:
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state = POWER_SUPPLY_CHARGE_TYPE_FAST;
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break;
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case RT5033_CHG_STAT_TYPE_PRE:
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state = POWER_SUPPLY_CHARGE_TYPE_TRICKLE;
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break;
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default:
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state = POWER_SUPPLY_CHARGE_TYPE_NONE;
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}
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return state;
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}
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static int rt5033_get_charger_current_limit(struct rt5033_charger *charger)
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{
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struct regmap *regmap = charger->regmap;
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unsigned int state, reg_data, data;
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regmap_read(regmap, RT5033_REG_CHG_CTRL5, ®_data);
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state = (reg_data & RT5033_CHGCTRL5_ICHG_MASK)
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>> RT5033_CHGCTRL5_ICHG_SHIFT;
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data = RT5033_CHARGER_FAST_CURRENT_MIN +
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RT5033_CHARGER_FAST_CURRENT_STEP_NUM * state;
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return data;
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}
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static int rt5033_get_charger_const_voltage(struct rt5033_charger *charger)
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{
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struct regmap *regmap = charger->regmap;
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unsigned int state, reg_data, data;
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regmap_read(regmap, RT5033_REG_CHG_CTRL2, ®_data);
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state = (reg_data & RT5033_CHGCTRL2_CV_MASK)
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>> RT5033_CHGCTRL2_CV_SHIFT;
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data = RT5033_CHARGER_CONST_VOLTAGE_LIMIT_MIN +
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RT5033_CHARGER_CONST_VOLTAGE_STEP_NUM * state;
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return data;
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}
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static inline int rt5033_init_const_charge(struct rt5033_charger *charger)
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{
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struct rt5033_charger_data *chg = charger->chg;
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int ret;
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unsigned int val;
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u8 reg_data;
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/* Set constant voltage mode */
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if (chg->const_uvolt < RT5033_CHARGER_CONST_VOLTAGE_LIMIT_MIN ||
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chg->const_uvolt > RT5033_CHARGER_CONST_VOLTAGE_LIMIT_MAX) {
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dev_err(charger->dev,
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"Value 'constant-charge-voltage-max-microvolt' out of range\n");
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return -EINVAL;
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}
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if (chg->const_uvolt == RT5033_CHARGER_CONST_VOLTAGE_LIMIT_MIN)
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reg_data = 0x00;
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else if (chg->const_uvolt == RT5033_CHARGER_CONST_VOLTAGE_LIMIT_MAX)
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reg_data = RT5033_CV_MAX_VOLTAGE;
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else {
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val = chg->const_uvolt;
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val -= RT5033_CHARGER_CONST_VOLTAGE_LIMIT_MIN;
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val /= RT5033_CHARGER_CONST_VOLTAGE_STEP_NUM;
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reg_data = val;
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}
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ret = regmap_update_bits(charger->regmap, RT5033_REG_CHG_CTRL2,
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RT5033_CHGCTRL2_CV_MASK,
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reg_data << RT5033_CHGCTRL2_CV_SHIFT);
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if (ret) {
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dev_err(charger->dev, "Failed regmap update\n");
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return -EINVAL;
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}
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/* Set end of charge current */
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if (chg->eoc_uamp < RT5033_CHARGER_EOC_MIN ||
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chg->eoc_uamp > RT5033_CHARGER_EOC_MAX) {
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dev_err(charger->dev,
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"Value 'charge-term-current-microamp' out of range\n");
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return -EINVAL;
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}
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if (chg->eoc_uamp == RT5033_CHARGER_EOC_MIN)
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reg_data = 0x01;
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else if (chg->eoc_uamp == RT5033_CHARGER_EOC_MAX)
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reg_data = 0x07;
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else {
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val = chg->eoc_uamp;
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if (val < RT5033_CHARGER_EOC_REF) {
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val -= RT5033_CHARGER_EOC_MIN;
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val /= RT5033_CHARGER_EOC_STEP_NUM1;
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reg_data = 0x01 + val;
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} else if (val > RT5033_CHARGER_EOC_REF) {
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val -= RT5033_CHARGER_EOC_REF;
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val /= RT5033_CHARGER_EOC_STEP_NUM2;
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reg_data = 0x04 + val;
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} else {
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reg_data = 0x04;
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}
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}
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ret = regmap_update_bits(charger->regmap, RT5033_REG_CHG_CTRL4,
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RT5033_CHGCTRL4_EOC_MASK, reg_data);
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if (ret) {
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dev_err(charger->dev, "Failed regmap update\n");
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return -EINVAL;
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}
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return 0;
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}
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static inline int rt5033_init_fast_charge(struct rt5033_charger *charger)
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{
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struct rt5033_charger_data *chg = charger->chg;
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int ret;
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unsigned int val;
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u8 reg_data;
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/* Set limit input current */
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ret = regmap_update_bits(charger->regmap, RT5033_REG_CHG_CTRL1,
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RT5033_CHGCTRL1_IAICR_MASK, RT5033_AICR_2000_MODE);
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if (ret) {
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dev_err(charger->dev, "Failed regmap update\n");
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return -EINVAL;
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}
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/* Set fast-charge mode charging current */
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if (chg->fast_uamp < RT5033_CHARGER_FAST_CURRENT_MIN ||
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chg->fast_uamp > RT5033_CHARGER_FAST_CURRENT_MAX) {
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dev_err(charger->dev,
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"Value 'constant-charge-current-max-microamp' out of range\n");
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return -EINVAL;
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}
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if (chg->fast_uamp == RT5033_CHARGER_FAST_CURRENT_MIN)
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reg_data = 0x00;
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else if (chg->fast_uamp == RT5033_CHARGER_FAST_CURRENT_MAX)
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reg_data = RT5033_CHG_MAX_CURRENT;
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else {
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val = chg->fast_uamp;
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val -= RT5033_CHARGER_FAST_CURRENT_MIN;
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val /= RT5033_CHARGER_FAST_CURRENT_STEP_NUM;
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reg_data = val;
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}
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ret = regmap_update_bits(charger->regmap, RT5033_REG_CHG_CTRL5,
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RT5033_CHGCTRL5_ICHG_MASK,
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reg_data << RT5033_CHGCTRL5_ICHG_SHIFT);
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if (ret) {
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dev_err(charger->dev, "Failed regmap update\n");
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return -EINVAL;
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}
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return 0;
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}
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static inline int rt5033_init_pre_charge(struct rt5033_charger *charger)
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{
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struct rt5033_charger_data *chg = charger->chg;
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int ret;
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unsigned int val;
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u8 reg_data;
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/* Set pre-charge threshold voltage */
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if (chg->pre_uvolt < RT5033_CHARGER_PRE_THRESHOLD_LIMIT_MIN ||
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chg->pre_uvolt > RT5033_CHARGER_PRE_THRESHOLD_LIMIT_MAX) {
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dev_err(charger->dev,
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"Value 'precharge-upper-limit-microvolt' out of range\n");
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return -EINVAL;
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}
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if (chg->pre_uvolt == RT5033_CHARGER_PRE_THRESHOLD_LIMIT_MIN)
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reg_data = 0x00;
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else if (chg->pre_uvolt == RT5033_CHARGER_PRE_THRESHOLD_LIMIT_MAX)
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reg_data = 0x0f;
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else {
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val = chg->pre_uvolt;
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val -= RT5033_CHARGER_PRE_THRESHOLD_LIMIT_MIN;
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val /= RT5033_CHARGER_PRE_THRESHOLD_STEP_NUM;
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reg_data = val;
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}
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ret = regmap_update_bits(charger->regmap, RT5033_REG_CHG_CTRL5,
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RT5033_CHGCTRL5_VPREC_MASK, reg_data);
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if (ret) {
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dev_err(charger->dev, "Failed regmap update\n");
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return -EINVAL;
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}
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/* Set pre-charge mode charging current */
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if (chg->pre_uamp < RT5033_CHARGER_PRE_CURRENT_LIMIT_MIN ||
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chg->pre_uamp > RT5033_CHARGER_PRE_CURRENT_LIMIT_MAX) {
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dev_err(charger->dev,
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"Value 'precharge-current-microamp' out of range\n");
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return -EINVAL;
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}
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if (chg->pre_uamp == RT5033_CHARGER_PRE_CURRENT_LIMIT_MIN)
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reg_data = 0x00;
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else if (chg->pre_uamp == RT5033_CHARGER_PRE_CURRENT_LIMIT_MAX)
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reg_data = RT5033_CHG_MAX_PRE_CURRENT;
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else {
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val = chg->pre_uamp;
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val -= RT5033_CHARGER_PRE_CURRENT_LIMIT_MIN;
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val /= RT5033_CHARGER_PRE_CURRENT_STEP_NUM;
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reg_data = val;
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}
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ret = regmap_update_bits(charger->regmap, RT5033_REG_CHG_CTRL4,
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RT5033_CHGCTRL4_IPREC_MASK,
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reg_data << RT5033_CHGCTRL4_IPREC_SHIFT);
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if (ret) {
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dev_err(charger->dev, "Failed regmap update\n");
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return -EINVAL;
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}
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return 0;
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}
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static int rt5033_charger_reg_init(struct rt5033_charger *charger)
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{
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int ret = 0;
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/* Enable charging termination */
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ret = regmap_update_bits(charger->regmap, RT5033_REG_CHG_CTRL1,
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RT5033_CHGCTRL1_TE_EN_MASK, RT5033_TE_ENABLE);
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if (ret) {
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dev_err(charger->dev, "Failed to enable charging termination.\n");
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return -EINVAL;
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}
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/*
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* Disable minimum input voltage regulation (MIVR), this improves
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* the charging performance.
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*/
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ret = regmap_update_bits(charger->regmap, RT5033_REG_CHG_CTRL4,
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RT5033_CHGCTRL4_MIVR_MASK, RT5033_CHARGER_MIVR_DISABLE);
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if (ret) {
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dev_err(charger->dev, "Failed to disable MIVR.\n");
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return -EINVAL;
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}
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ret = rt5033_init_pre_charge(charger);
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if (ret)
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return ret;
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ret = rt5033_init_fast_charge(charger);
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if (ret)
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return ret;
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ret = rt5033_init_const_charge(charger);
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if (ret)
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return ret;
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return 0;
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}
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static enum power_supply_property rt5033_charger_props[] = {
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POWER_SUPPLY_PROP_STATUS,
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POWER_SUPPLY_PROP_CHARGE_TYPE,
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POWER_SUPPLY_PROP_CURRENT_MAX,
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POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE,
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POWER_SUPPLY_PROP_MODEL_NAME,
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POWER_SUPPLY_PROP_MANUFACTURER,
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POWER_SUPPLY_PROP_ONLINE,
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};
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static int rt5033_charger_get_property(struct power_supply *psy,
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enum power_supply_property psp,
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union power_supply_propval *val)
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{
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struct rt5033_charger *charger = power_supply_get_drvdata(psy);
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switch (psp) {
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case POWER_SUPPLY_PROP_STATUS:
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val->intval = rt5033_get_charger_state(charger);
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||
|
|
break;
|
||
|
|
case POWER_SUPPLY_PROP_CHARGE_TYPE:
|
||
|
|
val->intval = rt5033_get_charger_type(charger);
|
||
|
|
break;
|
||
|
|
case POWER_SUPPLY_PROP_CURRENT_MAX:
|
||
|
|
val->intval = rt5033_get_charger_current_limit(charger);
|
||
|
|
break;
|
||
|
|
case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
|
||
|
|
val->intval = rt5033_get_charger_const_voltage(charger);
|
||
|
|
break;
|
||
|
|
case POWER_SUPPLY_PROP_MODEL_NAME:
|
||
|
|
val->strval = RT5033_CHARGER_MODEL;
|
||
|
|
break;
|
||
|
|
case POWER_SUPPLY_PROP_MANUFACTURER:
|
||
|
|
val->strval = RT5033_MANUFACTURER;
|
||
|
|
break;
|
||
|
|
case POWER_SUPPLY_PROP_ONLINE:
|
||
|
|
val->intval = (rt5033_get_charger_state(charger) ==
|
||
|
|
POWER_SUPPLY_STATUS_CHARGING);
|
||
|
|
break;
|
||
|
|
default:
|
||
|
|
return -EINVAL;
|
||
|
|
}
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static struct rt5033_charger_data *rt5033_charger_dt_init(
|
||
|
|
struct rt5033_charger *charger)
|
||
|
|
{
|
||
|
|
struct rt5033_charger_data *chg;
|
||
|
|
struct power_supply_battery_info *info;
|
||
|
|
int ret;
|
||
|
|
|
||
|
|
chg = devm_kzalloc(charger->dev, sizeof(*chg), GFP_KERNEL);
|
||
|
|
if (!chg)
|
||
|
|
return ERR_PTR(-ENOMEM);
|
||
|
|
|
||
|
|
ret = power_supply_get_battery_info(charger->psy, &info);
|
||
|
|
if (ret)
|
||
|
|
return ERR_PTR(dev_err_probe(charger->dev, -EINVAL,
|
||
|
|
"missing battery info\n"));
|
||
|
|
|
||
|
|
/* Assign data. Validity will be checked in the init functions. */
|
||
|
|
chg->pre_uamp = info->precharge_current_ua;
|
||
|
|
chg->fast_uamp = info->constant_charge_current_max_ua;
|
||
|
|
chg->eoc_uamp = info->charge_term_current_ua;
|
||
|
|
chg->pre_uvolt = info->precharge_voltage_max_uv;
|
||
|
|
chg->const_uvolt = info->constant_charge_voltage_max_uv;
|
||
|
|
|
||
|
|
return chg;
|
||
|
|
}
|
||
|
|
|
||
|
|
static const struct power_supply_desc rt5033_charger_desc = {
|
||
|
|
.name = "rt5033-charger",
|
||
|
|
.type = POWER_SUPPLY_TYPE_USB,
|
||
|
|
.properties = rt5033_charger_props,
|
||
|
|
.num_properties = ARRAY_SIZE(rt5033_charger_props),
|
||
|
|
.get_property = rt5033_charger_get_property,
|
||
|
|
};
|
||
|
|
|
||
|
|
static int rt5033_charger_probe(struct platform_device *pdev)
|
||
|
|
{
|
||
|
|
struct rt5033_charger *charger;
|
||
|
|
struct power_supply_config psy_cfg = {};
|
||
|
|
int ret;
|
||
|
|
|
||
|
|
charger = devm_kzalloc(&pdev->dev, sizeof(*charger), GFP_KERNEL);
|
||
|
|
if (!charger)
|
||
|
|
return -ENOMEM;
|
||
|
|
|
||
|
|
platform_set_drvdata(pdev, charger);
|
||
|
|
charger->dev = &pdev->dev;
|
||
|
|
charger->regmap = dev_get_regmap(pdev->dev.parent, NULL);
|
||
|
|
|
||
|
|
psy_cfg.of_node = pdev->dev.of_node;
|
||
|
|
psy_cfg.drv_data = charger;
|
||
|
|
|
||
|
|
charger->psy = devm_power_supply_register(&pdev->dev,
|
||
|
|
&rt5033_charger_desc,
|
||
|
|
&psy_cfg);
|
||
|
|
if (IS_ERR(charger->psy))
|
||
|
|
return dev_err_probe(&pdev->dev, PTR_ERR(charger->psy),
|
||
|
|
"Failed to register power supply\n");
|
||
|
|
|
||
|
|
charger->chg = rt5033_charger_dt_init(charger);
|
||
|
|
if (IS_ERR_OR_NULL(charger->chg))
|
||
|
|
return PTR_ERR(charger->chg);
|
||
|
|
|
||
|
|
ret = rt5033_charger_reg_init(charger);
|
||
|
|
if (ret)
|
||
|
|
return ret;
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static const struct platform_device_id rt5033_charger_id[] = {
|
||
|
|
{ "rt5033-charger", },
|
||
|
|
{ }
|
||
|
|
};
|
||
|
|
MODULE_DEVICE_TABLE(platform, rt5033_charger_id);
|
||
|
|
|
||
|
|
static const struct of_device_id rt5033_charger_of_match[] = {
|
||
|
|
{ .compatible = "richtek,rt5033-charger", },
|
||
|
|
{ }
|
||
|
|
};
|
||
|
|
MODULE_DEVICE_TABLE(of, rt5033_charger_of_match);
|
||
|
|
|
||
|
|
static struct platform_driver rt5033_charger_driver = {
|
||
|
|
.driver = {
|
||
|
|
.name = "rt5033-charger",
|
||
|
|
.of_match_table = rt5033_charger_of_match,
|
||
|
|
},
|
||
|
|
.probe = rt5033_charger_probe,
|
||
|
|
.id_table = rt5033_charger_id,
|
||
|
|
};
|
||
|
|
module_platform_driver(rt5033_charger_driver);
|
||
|
|
|
||
|
|
MODULE_DESCRIPTION("Richtek RT5033 charger driver");
|
||
|
|
MODULE_AUTHOR("Beomho Seo <beomho.seo@samsung.com>");
|
||
|
|
MODULE_LICENSE("GPL v2");
|