360 lines
8.8 KiB
C
360 lines
8.8 KiB
C
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/*
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* Power supply driver for the Active-semi ACT8945A PMIC
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*
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* Copyright (C) 2015 Atmel Corporation
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*
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* Author: Wenyou Yang <wenyou.yang@atmel.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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*/
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/of_gpio.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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static const char *act8945a_charger_model = "ACT8945A";
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static const char *act8945a_charger_manufacturer = "Active-semi";
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/**
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* ACT8945A Charger Register Map
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*/
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/* 0x70: Reserved */
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#define ACT8945A_APCH_CFG 0x71
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#define ACT8945A_APCH_STATUS 0x78
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#define ACT8945A_APCH_CTRL 0x79
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#define ACT8945A_APCH_STATE 0x7A
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/* ACT8945A_APCH_CFG */
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#define APCH_CFG_OVPSET (0x3 << 0)
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#define APCH_CFG_OVPSET_6V6 (0x0 << 0)
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#define APCH_CFG_OVPSET_7V (0x1 << 0)
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#define APCH_CFG_OVPSET_7V5 (0x2 << 0)
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#define APCH_CFG_OVPSET_8V (0x3 << 0)
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#define APCH_CFG_PRETIMO (0x3 << 2)
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#define APCH_CFG_PRETIMO_40_MIN (0x0 << 2)
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#define APCH_CFG_PRETIMO_60_MIN (0x1 << 2)
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#define APCH_CFG_PRETIMO_80_MIN (0x2 << 2)
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#define APCH_CFG_PRETIMO_DISABLED (0x3 << 2)
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#define APCH_CFG_TOTTIMO (0x3 << 4)
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#define APCH_CFG_TOTTIMO_3_HOUR (0x0 << 4)
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#define APCH_CFG_TOTTIMO_4_HOUR (0x1 << 4)
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#define APCH_CFG_TOTTIMO_5_HOUR (0x2 << 4)
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#define APCH_CFG_TOTTIMO_DISABLED (0x3 << 4)
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#define APCH_CFG_SUSCHG (0x1 << 7)
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#define APCH_STATUS_CHGDAT BIT(0)
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#define APCH_STATUS_INDAT BIT(1)
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#define APCH_STATUS_TEMPDAT BIT(2)
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#define APCH_STATUS_TIMRDAT BIT(3)
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#define APCH_STATUS_CHGSTAT BIT(4)
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#define APCH_STATUS_INSTAT BIT(5)
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#define APCH_STATUS_TEMPSTAT BIT(6)
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#define APCH_STATUS_TIMRSTAT BIT(7)
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#define APCH_CTRL_CHGEOCOUT BIT(0)
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#define APCH_CTRL_INDIS BIT(1)
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#define APCH_CTRL_TEMPOUT BIT(2)
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#define APCH_CTRL_TIMRPRE BIT(3)
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#define APCH_CTRL_CHGEOCIN BIT(4)
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#define APCH_CTRL_INCON BIT(5)
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#define APCH_CTRL_TEMPIN BIT(6)
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#define APCH_CTRL_TIMRTOT BIT(7)
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#define APCH_STATE_ACINSTAT (0x1 << 1)
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#define APCH_STATE_CSTATE (0x3 << 4)
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#define APCH_STATE_CSTATE_SHIFT 4
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#define APCH_STATE_CSTATE_DISABLED 0x00
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#define APCH_STATE_CSTATE_EOC 0x01
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#define APCH_STATE_CSTATE_FAST 0x02
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#define APCH_STATE_CSTATE_PRE 0x03
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struct act8945a_charger {
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struct regmap *regmap;
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bool battery_temperature;
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};
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static int act8945a_get_charger_state(struct regmap *regmap, int *val)
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{
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int ret;
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unsigned int status, state;
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ret = regmap_read(regmap, ACT8945A_APCH_STATUS, &status);
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if (ret < 0)
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return ret;
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ret = regmap_read(regmap, ACT8945A_APCH_STATE, &state);
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if (ret < 0)
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return ret;
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state &= APCH_STATE_CSTATE;
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state >>= APCH_STATE_CSTATE_SHIFT;
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if (state == APCH_STATE_CSTATE_EOC) {
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if (status & APCH_STATUS_CHGDAT)
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*val = POWER_SUPPLY_STATUS_FULL;
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else
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*val = POWER_SUPPLY_STATUS_NOT_CHARGING;
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} else if ((state == APCH_STATE_CSTATE_FAST) ||
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(state == APCH_STATE_CSTATE_PRE)) {
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*val = POWER_SUPPLY_STATUS_CHARGING;
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} else {
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*val = POWER_SUPPLY_STATUS_NOT_CHARGING;
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}
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return 0;
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}
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static int act8945a_get_charge_type(struct regmap *regmap, int *val)
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{
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int ret;
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unsigned int state;
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ret = regmap_read(regmap, ACT8945A_APCH_STATE, &state);
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if (ret < 0)
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return ret;
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state &= APCH_STATE_CSTATE;
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state >>= APCH_STATE_CSTATE_SHIFT;
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switch (state) {
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case APCH_STATE_CSTATE_PRE:
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*val = POWER_SUPPLY_CHARGE_TYPE_TRICKLE;
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break;
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case APCH_STATE_CSTATE_FAST:
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*val = POWER_SUPPLY_CHARGE_TYPE_FAST;
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break;
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case APCH_STATE_CSTATE_EOC:
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case APCH_STATE_CSTATE_DISABLED:
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default:
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*val = POWER_SUPPLY_CHARGE_TYPE_NONE;
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}
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return 0;
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}
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static int act8945a_get_battery_health(struct act8945a_charger *charger,
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struct regmap *regmap, int *val)
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{
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int ret;
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unsigned int status;
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ret = regmap_read(regmap, ACT8945A_APCH_STATUS, &status);
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if (ret < 0)
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return ret;
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if (charger->battery_temperature && !(status & APCH_STATUS_TEMPDAT))
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*val = POWER_SUPPLY_HEALTH_OVERHEAT;
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else if (!(status & APCH_STATUS_INDAT))
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*val = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
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else if (status & APCH_STATUS_TIMRDAT)
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*val = POWER_SUPPLY_HEALTH_SAFETY_TIMER_EXPIRE;
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else
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*val = POWER_SUPPLY_HEALTH_GOOD;
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return 0;
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}
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static enum power_supply_property act8945a_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_TECHNOLOGY,
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POWER_SUPPLY_PROP_HEALTH,
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POWER_SUPPLY_PROP_MODEL_NAME,
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POWER_SUPPLY_PROP_MANUFACTURER
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};
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static int act8945a_charger_get_property(struct power_supply *psy,
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enum power_supply_property prop,
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union power_supply_propval *val)
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{
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struct act8945a_charger *charger = power_supply_get_drvdata(psy);
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struct regmap *regmap = charger->regmap;
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int ret = 0;
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switch (prop) {
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case POWER_SUPPLY_PROP_STATUS:
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ret = act8945a_get_charger_state(regmap, &val->intval);
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break;
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case POWER_SUPPLY_PROP_CHARGE_TYPE:
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ret = act8945a_get_charge_type(regmap, &val->intval);
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break;
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case POWER_SUPPLY_PROP_TECHNOLOGY:
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val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
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break;
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case POWER_SUPPLY_PROP_HEALTH:
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ret = act8945a_get_battery_health(charger,
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regmap, &val->intval);
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break;
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case POWER_SUPPLY_PROP_MODEL_NAME:
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val->strval = act8945a_charger_model;
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break;
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case POWER_SUPPLY_PROP_MANUFACTURER:
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val->strval = act8945a_charger_manufacturer;
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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 ret;
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}
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static const struct power_supply_desc act8945a_charger_desc = {
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.name = "act8945a-charger",
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.type = POWER_SUPPLY_TYPE_BATTERY,
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.get_property = act8945a_charger_get_property,
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.properties = act8945a_charger_props,
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.num_properties = ARRAY_SIZE(act8945a_charger_props),
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};
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#define DEFAULT_TOTAL_TIME_OUT 3
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#define DEFAULT_PRE_TIME_OUT 40
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#define DEFAULT_INPUT_OVP_THRESHOLD 6600
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static int act8945a_charger_config(struct device *dev,
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struct act8945a_charger *charger)
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{
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struct device_node *np = dev->of_node;
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enum of_gpio_flags flags;
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struct regmap *regmap = charger->regmap;
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u32 total_time_out;
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u32 pre_time_out;
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u32 input_voltage_threshold;
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int chglev_pin;
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unsigned int value = 0;
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if (!np) {
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dev_err(dev, "no charger of node\n");
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return -EINVAL;
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}
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charger->battery_temperature = of_property_read_bool(np,
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"active-semi,check-battery-temperature");
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chglev_pin = of_get_named_gpio_flags(np,
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"active-semi,chglev-gpios", 0, &flags);
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if (gpio_is_valid(chglev_pin)) {
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gpio_set_value(chglev_pin,
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((flags == OF_GPIO_ACTIVE_LOW) ? 0 : 1));
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}
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if (of_property_read_u32(np,
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"active-semi,input-voltage-threshold-microvolt",
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&input_voltage_threshold))
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input_voltage_threshold = DEFAULT_INPUT_OVP_THRESHOLD;
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if (of_property_read_u32(np,
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"active-semi,precondition-timeout",
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&pre_time_out))
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pre_time_out = DEFAULT_PRE_TIME_OUT;
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if (of_property_read_u32(np, "active-semi,total-timeout",
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&total_time_out))
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total_time_out = DEFAULT_TOTAL_TIME_OUT;
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switch (input_voltage_threshold) {
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case 8000:
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value |= APCH_CFG_OVPSET_8V;
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break;
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case 7500:
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value |= APCH_CFG_OVPSET_7V5;
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break;
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case 7000:
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value |= APCH_CFG_OVPSET_7V;
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break;
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case 6600:
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default:
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value |= APCH_CFG_OVPSET_6V6;
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break;
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}
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switch (pre_time_out) {
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case 60:
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value |= APCH_CFG_PRETIMO_60_MIN;
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break;
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case 80:
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value |= APCH_CFG_PRETIMO_80_MIN;
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break;
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case 0:
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value |= APCH_CFG_PRETIMO_DISABLED;
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break;
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case 40:
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default:
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value |= APCH_CFG_PRETIMO_40_MIN;
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break;
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}
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switch (total_time_out) {
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case 4:
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value |= APCH_CFG_TOTTIMO_4_HOUR;
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break;
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case 5:
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value |= APCH_CFG_TOTTIMO_5_HOUR;
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break;
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case 0:
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value |= APCH_CFG_TOTTIMO_DISABLED;
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break;
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case 3:
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default:
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value |= APCH_CFG_TOTTIMO_3_HOUR;
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break;
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}
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return regmap_write(regmap, ACT8945A_APCH_CFG, value);
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}
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static int act8945a_charger_probe(struct platform_device *pdev)
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{
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struct act8945a_charger *charger;
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struct power_supply *psy;
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struct power_supply_config psy_cfg = {};
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int ret;
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charger = devm_kzalloc(&pdev->dev, sizeof(*charger), GFP_KERNEL);
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if (!charger)
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return -ENOMEM;
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charger->regmap = dev_get_regmap(pdev->dev.parent, NULL);
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if (!charger->regmap) {
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dev_err(&pdev->dev, "Parent did not provide regmap\n");
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return -EINVAL;
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}
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ret = act8945a_charger_config(pdev->dev.parent, charger);
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if (ret)
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return ret;
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psy_cfg.of_node = pdev->dev.parent->of_node;
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psy_cfg.drv_data = charger;
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psy = devm_power_supply_register(&pdev->dev,
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&act8945a_charger_desc,
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&psy_cfg);
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if (IS_ERR(psy)) {
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dev_err(&pdev->dev, "failed to register power supply\n");
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return PTR_ERR(psy);
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}
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return 0;
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}
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static struct platform_driver act8945a_charger_driver = {
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.driver = {
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.name = "act8945a-charger",
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},
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.probe = act8945a_charger_probe,
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};
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module_platform_driver(act8945a_charger_driver);
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MODULE_DESCRIPTION("Active-semi ACT8945A ActivePath charger driver");
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MODULE_AUTHOR("Wenyou Yang <wenyou.yang@atmel.com>");
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||
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MODULE_LICENSE("GPL");
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