/* * Power supply driver for the Active-semi ACT8945A PMIC * * Copyright (C) 2015 Atmel Corporation * * Author: Wenyou Yang * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. * */ #include #include #include #include #include #include static const char *act8945a_charger_model = "ACT8945A"; static const char *act8945a_charger_manufacturer = "Active-semi"; /** * ACT8945A Charger Register Map */ /* 0x70: Reserved */ #define ACT8945A_APCH_CFG 0x71 #define ACT8945A_APCH_STATUS 0x78 #define ACT8945A_APCH_CTRL 0x79 #define ACT8945A_APCH_STATE 0x7A /* ACT8945A_APCH_CFG */ #define APCH_CFG_OVPSET (0x3 << 0) #define APCH_CFG_OVPSET_6V6 (0x0 << 0) #define APCH_CFG_OVPSET_7V (0x1 << 0) #define APCH_CFG_OVPSET_7V5 (0x2 << 0) #define APCH_CFG_OVPSET_8V (0x3 << 0) #define APCH_CFG_PRETIMO (0x3 << 2) #define APCH_CFG_PRETIMO_40_MIN (0x0 << 2) #define APCH_CFG_PRETIMO_60_MIN (0x1 << 2) #define APCH_CFG_PRETIMO_80_MIN (0x2 << 2) #define APCH_CFG_PRETIMO_DISABLED (0x3 << 2) #define APCH_CFG_TOTTIMO (0x3 << 4) #define APCH_CFG_TOTTIMO_3_HOUR (0x0 << 4) #define APCH_CFG_TOTTIMO_4_HOUR (0x1 << 4) #define APCH_CFG_TOTTIMO_5_HOUR (0x2 << 4) #define APCH_CFG_TOTTIMO_DISABLED (0x3 << 4) #define APCH_CFG_SUSCHG (0x1 << 7) #define APCH_STATUS_CHGDAT BIT(0) #define APCH_STATUS_INDAT BIT(1) #define APCH_STATUS_TEMPDAT BIT(2) #define APCH_STATUS_TIMRDAT BIT(3) #define APCH_STATUS_CHGSTAT BIT(4) #define APCH_STATUS_INSTAT BIT(5) #define APCH_STATUS_TEMPSTAT BIT(6) #define APCH_STATUS_TIMRSTAT BIT(7) #define APCH_CTRL_CHGEOCOUT BIT(0) #define APCH_CTRL_INDIS BIT(1) #define APCH_CTRL_TEMPOUT BIT(2) #define APCH_CTRL_TIMRPRE BIT(3) #define APCH_CTRL_CHGEOCIN BIT(4) #define APCH_CTRL_INCON BIT(5) #define APCH_CTRL_TEMPIN BIT(6) #define APCH_CTRL_TIMRTOT BIT(7) #define APCH_STATE_ACINSTAT (0x1 << 1) #define APCH_STATE_CSTATE (0x3 << 4) #define APCH_STATE_CSTATE_SHIFT 4 #define APCH_STATE_CSTATE_DISABLED 0x00 #define APCH_STATE_CSTATE_EOC 0x01 #define APCH_STATE_CSTATE_FAST 0x02 #define APCH_STATE_CSTATE_PRE 0x03 struct act8945a_charger { struct regmap *regmap; bool battery_temperature; }; static int act8945a_get_charger_state(struct regmap *regmap, int *val) { int ret; unsigned int status, state; ret = regmap_read(regmap, ACT8945A_APCH_STATUS, &status); if (ret < 0) return ret; ret = regmap_read(regmap, ACT8945A_APCH_STATE, &state); if (ret < 0) return ret; state &= APCH_STATE_CSTATE; state >>= APCH_STATE_CSTATE_SHIFT; if (state == APCH_STATE_CSTATE_EOC) { if (status & APCH_STATUS_CHGDAT) *val = POWER_SUPPLY_STATUS_FULL; else *val = POWER_SUPPLY_STATUS_NOT_CHARGING; } else if ((state == APCH_STATE_CSTATE_FAST) || (state == APCH_STATE_CSTATE_PRE)) { *val = POWER_SUPPLY_STATUS_CHARGING; } else { *val = POWER_SUPPLY_STATUS_NOT_CHARGING; } return 0; } static int act8945a_get_charge_type(struct regmap *regmap, int *val) { int ret; unsigned int state; ret = regmap_read(regmap, ACT8945A_APCH_STATE, &state); if (ret < 0) return ret; state &= APCH_STATE_CSTATE; state >>= APCH_STATE_CSTATE_SHIFT; switch (state) { case APCH_STATE_CSTATE_PRE: *val = POWER_SUPPLY_CHARGE_TYPE_TRICKLE; break; case APCH_STATE_CSTATE_FAST: *val = POWER_SUPPLY_CHARGE_TYPE_FAST; break; case APCH_STATE_CSTATE_EOC: case APCH_STATE_CSTATE_DISABLED: default: *val = POWER_SUPPLY_CHARGE_TYPE_NONE; } return 0; } static int act8945a_get_battery_health(struct act8945a_charger *charger, struct regmap *regmap, int *val) { int ret; unsigned int status; ret = regmap_read(regmap, ACT8945A_APCH_STATUS, &status); if (ret < 0) return ret; if (charger->battery_temperature && !(status & APCH_STATUS_TEMPDAT)) *val = POWER_SUPPLY_HEALTH_OVERHEAT; else if (!(status & APCH_STATUS_INDAT)) *val = POWER_SUPPLY_HEALTH_OVERVOLTAGE; else if (status & APCH_STATUS_TIMRDAT) *val = POWER_SUPPLY_HEALTH_SAFETY_TIMER_EXPIRE; else *val = POWER_SUPPLY_HEALTH_GOOD; return 0; } static enum power_supply_property act8945a_charger_props[] = { POWER_SUPPLY_PROP_STATUS, POWER_SUPPLY_PROP_CHARGE_TYPE, POWER_SUPPLY_PROP_TECHNOLOGY, POWER_SUPPLY_PROP_HEALTH, POWER_SUPPLY_PROP_MODEL_NAME, POWER_SUPPLY_PROP_MANUFACTURER }; static int act8945a_charger_get_property(struct power_supply *psy, enum power_supply_property prop, union power_supply_propval *val) { struct act8945a_charger *charger = power_supply_get_drvdata(psy); struct regmap *regmap = charger->regmap; int ret = 0; switch (prop) { case POWER_SUPPLY_PROP_STATUS: ret = act8945a_get_charger_state(regmap, &val->intval); break; case POWER_SUPPLY_PROP_CHARGE_TYPE: ret = act8945a_get_charge_type(regmap, &val->intval); break; case POWER_SUPPLY_PROP_TECHNOLOGY: val->intval = POWER_SUPPLY_TECHNOLOGY_LION; break; case POWER_SUPPLY_PROP_HEALTH: ret = act8945a_get_battery_health(charger, regmap, &val->intval); break; case POWER_SUPPLY_PROP_MODEL_NAME: val->strval = act8945a_charger_model; break; case POWER_SUPPLY_PROP_MANUFACTURER: val->strval = act8945a_charger_manufacturer; break; default: return -EINVAL; } return ret; } static const struct power_supply_desc act8945a_charger_desc = { .name = "act8945a-charger", .type = POWER_SUPPLY_TYPE_BATTERY, .get_property = act8945a_charger_get_property, .properties = act8945a_charger_props, .num_properties = ARRAY_SIZE(act8945a_charger_props), }; #define DEFAULT_TOTAL_TIME_OUT 3 #define DEFAULT_PRE_TIME_OUT 40 #define DEFAULT_INPUT_OVP_THRESHOLD 6600 static int act8945a_charger_config(struct device *dev, struct act8945a_charger *charger) { struct device_node *np = dev->of_node; enum of_gpio_flags flags; struct regmap *regmap = charger->regmap; u32 total_time_out; u32 pre_time_out; u32 input_voltage_threshold; int chglev_pin; unsigned int value = 0; if (!np) { dev_err(dev, "no charger of node\n"); return -EINVAL; } charger->battery_temperature = of_property_read_bool(np, "active-semi,check-battery-temperature"); chglev_pin = of_get_named_gpio_flags(np, "active-semi,chglev-gpios", 0, &flags); if (gpio_is_valid(chglev_pin)) { gpio_set_value(chglev_pin, ((flags == OF_GPIO_ACTIVE_LOW) ? 0 : 1)); } if (of_property_read_u32(np, "active-semi,input-voltage-threshold-microvolt", &input_voltage_threshold)) input_voltage_threshold = DEFAULT_INPUT_OVP_THRESHOLD; if (of_property_read_u32(np, "active-semi,precondition-timeout", &pre_time_out)) pre_time_out = DEFAULT_PRE_TIME_OUT; if (of_property_read_u32(np, "active-semi,total-timeout", &total_time_out)) total_time_out = DEFAULT_TOTAL_TIME_OUT; switch (input_voltage_threshold) { case 8000: value |= APCH_CFG_OVPSET_8V; break; case 7500: value |= APCH_CFG_OVPSET_7V5; break; case 7000: value |= APCH_CFG_OVPSET_7V; break; case 6600: default: value |= APCH_CFG_OVPSET_6V6; break; } switch (pre_time_out) { case 60: value |= APCH_CFG_PRETIMO_60_MIN; break; case 80: value |= APCH_CFG_PRETIMO_80_MIN; break; case 0: value |= APCH_CFG_PRETIMO_DISABLED; break; case 40: default: value |= APCH_CFG_PRETIMO_40_MIN; break; } switch (total_time_out) { case 4: value |= APCH_CFG_TOTTIMO_4_HOUR; break; case 5: value |= APCH_CFG_TOTTIMO_5_HOUR; break; case 0: value |= APCH_CFG_TOTTIMO_DISABLED; break; case 3: default: value |= APCH_CFG_TOTTIMO_3_HOUR; break; } return regmap_write(regmap, ACT8945A_APCH_CFG, value); } static int act8945a_charger_probe(struct platform_device *pdev) { struct act8945a_charger *charger; struct power_supply *psy; struct power_supply_config psy_cfg = {}; int ret; charger = devm_kzalloc(&pdev->dev, sizeof(*charger), GFP_KERNEL); if (!charger) return -ENOMEM; charger->regmap = dev_get_regmap(pdev->dev.parent, NULL); if (!charger->regmap) { dev_err(&pdev->dev, "Parent did not provide regmap\n"); return -EINVAL; } ret = act8945a_charger_config(pdev->dev.parent, charger); if (ret) return ret; psy_cfg.of_node = pdev->dev.parent->of_node; psy_cfg.drv_data = charger; psy = devm_power_supply_register(&pdev->dev, &act8945a_charger_desc, &psy_cfg); if (IS_ERR(psy)) { dev_err(&pdev->dev, "failed to register power supply\n"); return PTR_ERR(psy); } return 0; } static struct platform_driver act8945a_charger_driver = { .driver = { .name = "act8945a-charger", }, .probe = act8945a_charger_probe, }; module_platform_driver(act8945a_charger_driver); MODULE_DESCRIPTION("Active-semi ACT8945A ActivePath charger driver"); MODULE_AUTHOR("Wenyou Yang "); MODULE_LICENSE("GPL");