377 lines
9.8 KiB
C
377 lines
9.8 KiB
C
// SPDX-License-Identifier: GPL-2.0
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//
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// Copyright (C) 2018 BayLibre SAS
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// Author: Bartosz Golaszewski <bgolaszewski@baylibre.com>
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//
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// Battery charger driver for MAXIM 77650/77651 charger/power-supply.
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#include <linux/i2c.h>
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#include <linux/interrupt.h>
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#include <linux/mfd/max77650.h>
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#include <linux/module.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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#define MAX77650_CHARGER_ENABLED BIT(0)
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#define MAX77650_CHARGER_DISABLED 0x00
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#define MAX77650_CHARGER_CHG_EN_MASK BIT(0)
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#define MAX77650_CHG_DETAILS_MASK GENMASK(7, 4)
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#define MAX77650_CHG_DETAILS_BITS(_reg) \
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(((_reg) & MAX77650_CHG_DETAILS_MASK) >> 4)
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/* Charger is OFF. */
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#define MAX77650_CHG_OFF 0x00
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/* Charger is in prequalification mode. */
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#define MAX77650_CHG_PREQ 0x01
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/* Charger is in fast-charge constant current mode. */
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#define MAX77650_CHG_ON_CURR 0x02
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/* Charger is in JEITA modified fast-charge constant-current mode. */
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#define MAX77650_CHG_ON_CURR_JEITA 0x03
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/* Charger is in fast-charge constant-voltage mode. */
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#define MAX77650_CHG_ON_VOLT 0x04
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/* Charger is in JEITA modified fast-charge constant-voltage mode. */
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#define MAX77650_CHG_ON_VOLT_JEITA 0x05
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/* Charger is in top-off mode. */
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#define MAX77650_CHG_ON_TOPOFF 0x06
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/* Charger is in JEITA modified top-off mode. */
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#define MAX77650_CHG_ON_TOPOFF_JEITA 0x07
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/* Charger is done. */
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#define MAX77650_CHG_DONE 0x08
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/* Charger is JEITA modified done. */
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#define MAX77650_CHG_DONE_JEITA 0x09
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/* Charger is suspended due to a prequalification timer fault. */
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#define MAX77650_CHG_SUSP_PREQ_TIM_FAULT 0x0a
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/* Charger is suspended due to a fast-charge timer fault. */
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#define MAX77650_CHG_SUSP_FAST_CHG_TIM_FAULT 0x0b
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/* Charger is suspended due to a battery temperature fault. */
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#define MAX77650_CHG_SUSP_BATT_TEMP_FAULT 0x0c
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#define MAX77650_CHGIN_DETAILS_MASK GENMASK(3, 2)
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#define MAX77650_CHGIN_DETAILS_BITS(_reg) \
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(((_reg) & MAX77650_CHGIN_DETAILS_MASK) >> 2)
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#define MAX77650_CHGIN_UNDERVOLTAGE_LOCKOUT 0x00
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#define MAX77650_CHGIN_OVERVOLTAGE_LOCKOUT 0x01
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#define MAX77650_CHGIN_OKAY 0x11
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#define MAX77650_CHARGER_CHG_MASK BIT(1)
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#define MAX77650_CHARGER_CHG_CHARGING(_reg) \
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(((_reg) & MAX77650_CHARGER_CHG_MASK) > 1)
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#define MAX77650_CHARGER_VCHGIN_MIN_MASK 0xc0
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#define MAX77650_CHARGER_VCHGIN_MIN_SHIFT(_val) ((_val) << 5)
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#define MAX77650_CHARGER_ICHGIN_LIM_MASK 0x1c
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#define MAX77650_CHARGER_ICHGIN_LIM_SHIFT(_val) ((_val) << 2)
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struct max77650_charger_data {
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struct regmap *map;
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struct device *dev;
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};
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static enum power_supply_property max77650_charger_properties[] = {
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POWER_SUPPLY_PROP_STATUS,
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POWER_SUPPLY_PROP_ONLINE,
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POWER_SUPPLY_PROP_CHARGE_TYPE
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};
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static const unsigned int max77650_charger_vchgin_min_table[] = {
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4000000, 4100000, 4200000, 4300000, 4400000, 4500000, 4600000, 4700000
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};
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static const unsigned int max77650_charger_ichgin_lim_table[] = {
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95000, 190000, 285000, 380000, 475000
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};
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static int max77650_charger_set_vchgin_min(struct max77650_charger_data *chg,
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unsigned int val)
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{
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int i, rv;
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for (i = 0; i < ARRAY_SIZE(max77650_charger_vchgin_min_table); i++) {
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if (val == max77650_charger_vchgin_min_table[i]) {
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rv = regmap_update_bits(chg->map,
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MAX77650_REG_CNFG_CHG_B,
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MAX77650_CHARGER_VCHGIN_MIN_MASK,
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MAX77650_CHARGER_VCHGIN_MIN_SHIFT(i));
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if (rv)
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return rv;
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return 0;
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}
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}
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return -EINVAL;
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}
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static int max77650_charger_set_ichgin_lim(struct max77650_charger_data *chg,
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unsigned int val)
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{
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int i, rv;
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for (i = 0; i < ARRAY_SIZE(max77650_charger_ichgin_lim_table); i++) {
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if (val == max77650_charger_ichgin_lim_table[i]) {
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rv = regmap_update_bits(chg->map,
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MAX77650_REG_CNFG_CHG_B,
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MAX77650_CHARGER_ICHGIN_LIM_MASK,
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MAX77650_CHARGER_ICHGIN_LIM_SHIFT(i));
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if (rv)
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return rv;
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return 0;
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}
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}
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return -EINVAL;
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}
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static int max77650_charger_enable(struct max77650_charger_data *chg)
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{
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int rv;
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rv = regmap_update_bits(chg->map,
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MAX77650_REG_CNFG_CHG_B,
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MAX77650_CHARGER_CHG_EN_MASK,
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MAX77650_CHARGER_ENABLED);
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if (rv)
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dev_err(chg->dev, "unable to enable the charger: %d\n", rv);
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return rv;
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}
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static int max77650_charger_disable(struct max77650_charger_data *chg)
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{
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int rv;
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rv = regmap_update_bits(chg->map,
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MAX77650_REG_CNFG_CHG_B,
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MAX77650_CHARGER_CHG_EN_MASK,
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MAX77650_CHARGER_DISABLED);
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if (rv)
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dev_err(chg->dev, "unable to disable the charger: %d\n", rv);
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return rv;
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}
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static irqreturn_t max77650_charger_check_status(int irq, void *data)
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{
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struct max77650_charger_data *chg = data;
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int rv, reg;
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rv = regmap_read(chg->map, MAX77650_REG_STAT_CHG_B, ®);
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if (rv) {
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dev_err(chg->dev,
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"unable to read the charger status: %d\n", rv);
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return IRQ_HANDLED;
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}
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switch (MAX77650_CHGIN_DETAILS_BITS(reg)) {
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case MAX77650_CHGIN_UNDERVOLTAGE_LOCKOUT:
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dev_err(chg->dev, "undervoltage lockout detected, disabling charger\n");
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max77650_charger_disable(chg);
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break;
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case MAX77650_CHGIN_OVERVOLTAGE_LOCKOUT:
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dev_err(chg->dev, "overvoltage lockout detected, disabling charger\n");
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max77650_charger_disable(chg);
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break;
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case MAX77650_CHGIN_OKAY:
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max77650_charger_enable(chg);
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break;
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default:
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/* May be 0x10 - debouncing */
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break;
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}
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return IRQ_HANDLED;
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}
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static int max77650_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 max77650_charger_data *chg = power_supply_get_drvdata(psy);
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int rv, reg;
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switch (psp) {
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case POWER_SUPPLY_PROP_STATUS:
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rv = regmap_read(chg->map, MAX77650_REG_STAT_CHG_B, ®);
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if (rv)
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return rv;
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if (MAX77650_CHARGER_CHG_CHARGING(reg)) {
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val->intval = POWER_SUPPLY_STATUS_CHARGING;
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break;
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}
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switch (MAX77650_CHG_DETAILS_BITS(reg)) {
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case MAX77650_CHG_OFF:
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case MAX77650_CHG_SUSP_PREQ_TIM_FAULT:
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case MAX77650_CHG_SUSP_FAST_CHG_TIM_FAULT:
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case MAX77650_CHG_SUSP_BATT_TEMP_FAULT:
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val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
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break;
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case MAX77650_CHG_PREQ:
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case MAX77650_CHG_ON_CURR:
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case MAX77650_CHG_ON_CURR_JEITA:
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case MAX77650_CHG_ON_VOLT:
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case MAX77650_CHG_ON_VOLT_JEITA:
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case MAX77650_CHG_ON_TOPOFF:
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case MAX77650_CHG_ON_TOPOFF_JEITA:
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val->intval = POWER_SUPPLY_STATUS_CHARGING;
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break;
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case MAX77650_CHG_DONE:
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val->intval = POWER_SUPPLY_STATUS_FULL;
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break;
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default:
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val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
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}
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break;
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case POWER_SUPPLY_PROP_ONLINE:
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rv = regmap_read(chg->map, MAX77650_REG_STAT_CHG_B, ®);
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if (rv)
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return rv;
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val->intval = MAX77650_CHARGER_CHG_CHARGING(reg);
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break;
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case POWER_SUPPLY_PROP_CHARGE_TYPE:
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rv = regmap_read(chg->map, MAX77650_REG_STAT_CHG_B, ®);
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if (rv)
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return rv;
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if (!MAX77650_CHARGER_CHG_CHARGING(reg)) {
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val->intval = POWER_SUPPLY_CHARGE_TYPE_NONE;
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break;
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}
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switch (MAX77650_CHG_DETAILS_BITS(reg)) {
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case MAX77650_CHG_PREQ:
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case MAX77650_CHG_ON_CURR:
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case MAX77650_CHG_ON_CURR_JEITA:
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case MAX77650_CHG_ON_VOLT:
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case MAX77650_CHG_ON_VOLT_JEITA:
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val->intval = POWER_SUPPLY_CHARGE_TYPE_FAST;
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break;
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case MAX77650_CHG_ON_TOPOFF:
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case MAX77650_CHG_ON_TOPOFF_JEITA:
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val->intval = POWER_SUPPLY_CHARGE_TYPE_TRICKLE;
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break;
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default:
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val->intval = POWER_SUPPLY_CHARGE_TYPE_UNKNOWN;
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}
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break;
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default:
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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 const struct power_supply_desc max77650_battery_desc = {
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.name = "max77650",
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.type = POWER_SUPPLY_TYPE_USB,
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.get_property = max77650_charger_get_property,
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.properties = max77650_charger_properties,
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.num_properties = ARRAY_SIZE(max77650_charger_properties),
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};
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static int max77650_charger_probe(struct platform_device *pdev)
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{
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struct power_supply_config pscfg = {};
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struct max77650_charger_data *chg;
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struct power_supply *battery;
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struct device *dev, *parent;
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int rv, chg_irq, chgin_irq;
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unsigned int prop;
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dev = &pdev->dev;
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parent = dev->parent;
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chg = devm_kzalloc(dev, sizeof(*chg), GFP_KERNEL);
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if (!chg)
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return -ENOMEM;
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platform_set_drvdata(pdev, chg);
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chg->map = dev_get_regmap(parent, NULL);
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if (!chg->map)
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return -ENODEV;
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chg->dev = dev;
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pscfg.of_node = dev->of_node;
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pscfg.drv_data = chg;
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chg_irq = platform_get_irq_byname(pdev, "CHG");
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if (chg_irq < 0)
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return chg_irq;
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chgin_irq = platform_get_irq_byname(pdev, "CHGIN");
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if (chgin_irq < 0)
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return chgin_irq;
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rv = devm_request_any_context_irq(dev, chg_irq,
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max77650_charger_check_status,
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IRQF_ONESHOT, "chg", chg);
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if (rv < 0)
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return rv;
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rv = devm_request_any_context_irq(dev, chgin_irq,
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max77650_charger_check_status,
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IRQF_ONESHOT, "chgin", chg);
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if (rv < 0)
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return rv;
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battery = devm_power_supply_register(dev,
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&max77650_battery_desc, &pscfg);
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if (IS_ERR(battery))
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return PTR_ERR(battery);
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rv = of_property_read_u32(dev->of_node,
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"input-voltage-min-microvolt", &prop);
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if (rv == 0) {
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rv = max77650_charger_set_vchgin_min(chg, prop);
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if (rv)
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return rv;
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}
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rv = of_property_read_u32(dev->of_node,
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"input-current-limit-microamp", &prop);
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if (rv == 0) {
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rv = max77650_charger_set_ichgin_lim(chg, prop);
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if (rv)
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return rv;
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}
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return max77650_charger_enable(chg);
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}
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static int max77650_charger_remove(struct platform_device *pdev)
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{
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struct max77650_charger_data *chg = platform_get_drvdata(pdev);
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return max77650_charger_disable(chg);
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}
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static const struct of_device_id max77650_charger_of_match[] = {
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{ .compatible = "maxim,max77650-charger" },
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{ }
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};
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MODULE_DEVICE_TABLE(of, max77650_charger_of_match);
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static struct platform_driver max77650_charger_driver = {
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.driver = {
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.name = "max77650-charger",
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.of_match_table = max77650_charger_of_match,
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},
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.probe = max77650_charger_probe,
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.remove = max77650_charger_remove,
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};
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module_platform_driver(max77650_charger_driver);
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MODULE_DESCRIPTION("MAXIM 77650/77651 charger driver");
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MODULE_AUTHOR("Bartosz Golaszewski <bgolaszewski@baylibre.com>");
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MODULE_LICENSE("GPL v2");
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MODULE_ALIAS("platform:max77650-charger");
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