657 lines
16 KiB
C
657 lines
16 KiB
C
/*
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* pf1550_charger.c - regulator driver for the PF1550
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*
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* Copyright (C) 2016 Freescale Semiconductor, Inc.
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* Robin Gong <yibin.gong@freescale.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 as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/interrupt.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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#include <linux/mfd/pf1550.h>
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#define PF1550_CHARGER_NAME "pf1550-charger"
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#define PF1550_DEFAULT_CONSTANT_VOLT 4200000
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#define PF1550_DEFAULT_MIN_SYSTEM_VOLT 3500000
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#define PF1550_DEFAULT_THERMAL_TEMP 75
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static const char *pf1550_charger_model = "PF1550";
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static const char *pf1550_charger_manufacturer = "Freescale";
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struct pf1550_charger {
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struct device *dev;
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struct pf1550_dev *pf1550;
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struct power_supply *charger;
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struct power_supply_desc psy_desc;
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int irq;
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struct delayed_work irq_work;
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struct mutex mutex;
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u32 constant_volt;
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u32 min_system_volt;
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u32 thermal_regulation_temp;
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};
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static struct pf1550_irq_info pf1550_charger_irqs[] = {
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{ PF1550_CHARG_IRQ_BAT2SOCI, "BAT2SOC" },
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{ PF1550_CHARG_IRQ_BATI, "BAT" },
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{ PF1550_CHARG_IRQ_CHGI, "CHG" },
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{ PF1550_CHARG_IRQ_VBUSI, "VBUS" },
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{ PF1550_CHARG_IRQ_THMI, "THM" },
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};
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static int pf1550_get_charger_state(struct regmap *regmap, int *val)
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{
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int ret;
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unsigned int data;
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ret = regmap_read(regmap, PF1550_CHARG_REG_CHG_SNS, &data);
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if (ret < 0)
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return ret;
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data &= PF1550_CHG_SNS_MASK;
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switch (data) {
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case PF1550_CHG_PRECHARGE:
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case PF1550_CHG_CONSTANT_CURRENT:
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case PF1550_CHG_CONSTANT_VOL:
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case PF1550_CHG_EOC:
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*val = POWER_SUPPLY_STATUS_CHARGING;
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break;
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case PF1550_CHG_DONE:
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*val = POWER_SUPPLY_STATUS_FULL;
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break;
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case PF1550_CHG_TIMER_FAULT:
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case PF1550_CHG_SUSPEND:
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*val = POWER_SUPPLY_STATUS_NOT_CHARGING;
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break;
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case PF1550_CHG_OFF_INV:
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case PF1550_CHG_OFF_TEMP:
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case PF1550_CHG_LINEAR_ONLY:
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*val = POWER_SUPPLY_STATUS_DISCHARGING;
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break;
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default:
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*val = POWER_SUPPLY_STATUS_UNKNOWN;
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}
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return 0;
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}
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static int pf1550_get_charge_type(struct regmap *regmap, int *val)
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{
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int ret;
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unsigned int data;
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ret = regmap_read(regmap, PF1550_CHARG_REG_CHG_SNS, &data);
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if (ret < 0)
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return ret;
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data &= PF1550_CHG_SNS_MASK;
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switch (data) {
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case PF1550_CHG_SNS_MASK:
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*val = POWER_SUPPLY_CHARGE_TYPE_TRICKLE;
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break;
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case PF1550_CHG_CONSTANT_CURRENT:
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case PF1550_CHG_CONSTANT_VOL:
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case PF1550_CHG_EOC:
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*val = POWER_SUPPLY_CHARGE_TYPE_FAST;
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break;
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case PF1550_CHG_DONE:
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case PF1550_CHG_TIMER_FAULT:
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case PF1550_CHG_SUSPEND:
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case PF1550_CHG_OFF_INV:
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case PF1550_CHG_BAT_OVER:
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case PF1550_CHG_OFF_TEMP:
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case PF1550_CHG_LINEAR_ONLY:
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*val = POWER_SUPPLY_CHARGE_TYPE_NONE;
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break;
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default:
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*val = POWER_SUPPLY_CHARGE_TYPE_UNKNOWN;
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}
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return 0;
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}
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/*
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* Supported health statuses:
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* - POWER_SUPPLY_HEALTH_DEAD
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* - POWER_SUPPLY_HEALTH_GOOD
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* - POWER_SUPPLY_HEALTH_OVERVOLTAGE
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* - POWER_SUPPLY_HEALTH_UNKNOWN
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*/
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static int pf1550_get_battery_health(struct regmap *regmap, int *val)
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{
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int ret;
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unsigned int data;
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ret = regmap_read(regmap, PF1550_CHARG_REG_BATT_SNS, &data);
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if (ret < 0)
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return ret;
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data &= PF1550_BAT_SNS_MASK;
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switch (data) {
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case PF1550_BAT_NO_DETECT:
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*val = POWER_SUPPLY_HEALTH_DEAD;
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break;
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case PF1550_BAT_NO_VBUS:
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case PF1550_BAT_LOW_THAN_PRECHARG:
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case PF1550_BAT_CHARG_FAIL:
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case PF1550_BAT_HIGH_THAN_PRECHARG:
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*val = POWER_SUPPLY_HEALTH_GOOD;
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break;
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case PF1550_BAT_OVER_VOL:
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*val = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
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break;
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default:
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*val = POWER_SUPPLY_HEALTH_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 pf1550_get_present(struct regmap *regmap, int *val)
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{
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unsigned int data;
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int ret;
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ret = regmap_read(regmap, PF1550_CHARG_REG_BATT_SNS, &data);
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if (ret < 0)
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return ret;
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data &= PF1550_BAT_SNS_MASK;
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*val = (data == PF1550_BAT_NO_DETECT) ? 0 : 1;
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return 0;
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}
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static int pf1550_get_online(struct regmap *regmap, int *val)
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{
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unsigned int data;
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int ret;
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ret = regmap_read(regmap, PF1550_CHARG_REG_VBUS_SNS, &data);
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if (ret < 0)
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return ret;
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*val = (data & PF1550_VBUS_VALID) ? 1 : 0;
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return 0;
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}
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static void pf1550_chg_bat_isr(struct pf1550_charger *chg)
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{
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unsigned int data;
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if (regmap_read(chg->pf1550->regmap, PF1550_CHARG_REG_BATT_SNS, &data)) {
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dev_err(chg->dev, "Read BATT_SNS error.\n");
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return;
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}
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switch (data & PF1550_BAT_SNS_MASK) {
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case PF1550_BAT_NO_VBUS:
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dev_dbg(chg->dev, "No valid VBUS input.\n");
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break;
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case PF1550_BAT_LOW_THAN_PRECHARG:
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dev_dbg(chg->dev, "VBAT < VPRECHG.LB.\n");
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break;
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case PF1550_BAT_CHARG_FAIL:
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dev_dbg(chg->dev, "Battery charging failed.\n");
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break;
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case PF1550_BAT_HIGH_THAN_PRECHARG:
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dev_dbg(chg->dev, "VBAT > VPRECHG.LB.\n");
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break;
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case PF1550_BAT_OVER_VOL:
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dev_dbg(chg->dev, "VBAT > VBATOV.\n");
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break;
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case PF1550_BAT_NO_DETECT:
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dev_dbg(chg->dev, "Battery not detected.\n");
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break;
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default:
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dev_err(chg->dev, "Unknown value read:%x\n",
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data & PF1550_CHG_SNS_MASK);
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}
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}
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static void pf1550_chg_chg_isr(struct pf1550_charger *chg)
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{
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unsigned int data;
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if (regmap_read(chg->pf1550->regmap, PF1550_CHARG_REG_CHG_SNS, &data)) {
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dev_err(chg->dev, "Read CHG_SNS error.\n");
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return;
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}
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switch (data & PF1550_CHG_SNS_MASK) {
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case PF1550_CHG_PRECHARGE:
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dev_dbg(chg->dev, "In pre-charger mode.\n");
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break;
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case PF1550_CHG_CONSTANT_CURRENT:
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dev_dbg(chg->dev, "In fast-charge constant current mode.\n");
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break;
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case PF1550_CHG_CONSTANT_VOL:
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dev_dbg(chg->dev, "In fast-charge constant voltage mode.\n");
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break;
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case PF1550_CHG_EOC:
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dev_dbg(chg->dev, "In EOC mode.\n");
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break;
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case PF1550_CHG_DONE:
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dev_dbg(chg->dev, "In DONE mode.\n");
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break;
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case PF1550_CHG_TIMER_FAULT:
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dev_info(chg->dev, "In timer fault mode.\n");
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break;
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case PF1550_CHG_SUSPEND:
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dev_info(chg->dev, "In thermistor suspend mode.\n");
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break;
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case PF1550_CHG_OFF_INV:
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dev_info(chg->dev, "Input invalid, charger off.\n");
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break;
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case PF1550_CHG_BAT_OVER:
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dev_info(chg->dev, "Battery over-voltage.\n");
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break;
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case PF1550_CHG_OFF_TEMP:
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dev_info(chg->dev, "Temp high, charger off.\n");
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break;
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case PF1550_CHG_LINEAR_ONLY:
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dev_dbg(chg->dev, "In Linear mode, not charging.\n");
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break;
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default:
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dev_err(chg->dev, "Unknown value read:%x\n",
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data & PF1550_CHG_SNS_MASK);
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}
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}
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static void pf1550_chg_vbus_isr(struct pf1550_charger *chg)
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{
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enum power_supply_type old_type;
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unsigned int data;
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if (regmap_read(chg->pf1550->regmap, PF1550_CHARG_REG_VBUS_SNS, &data)) {
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dev_err(chg->dev, "Read VBUS_SNS error.\n");
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return;
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}
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old_type = chg->psy_desc.type;
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if (data & PF1550_VBUS_UVLO) {
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chg->psy_desc.type = POWER_SUPPLY_TYPE_BATTERY;
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dev_dbg(chg->dev, "VBUS deattached.\n");
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}
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if (data & PF1550_VBUS_IN2SYS)
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dev_dbg(chg->dev, "VBUS_IN2SYS_SNS.\n");
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if (data & PF1550_VBUS_OVLO)
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dev_dbg(chg->dev, "VBUS_OVLO_SNS.\n");
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if (data & PF1550_VBUS_VALID) {
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chg->psy_desc.type = POWER_SUPPLY_TYPE_MAINS;
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dev_dbg(chg->dev, "VBUS attached.\n");
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}
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if (old_type != chg->psy_desc.type)
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power_supply_changed(chg->charger);
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}
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static irqreturn_t pf1550_charger_irq_handler(int irq, void *data)
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{
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struct pf1550_charger *chg = data;
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chg->irq = irq;
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schedule_delayed_work(&chg->irq_work, msecs_to_jiffies(10));
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return IRQ_HANDLED;
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}
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static void pf1550_charger_irq_work(struct work_struct *work)
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{
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struct pf1550_charger *chg = container_of(to_delayed_work(work),
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struct pf1550_charger,
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irq_work);
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int i, irq_type = -1;
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unsigned int status;
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if (!chg->charger)
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return;
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mutex_lock(&chg->mutex);
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for (i = 0; i < ARRAY_SIZE(pf1550_charger_irqs); i++)
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if (chg->irq == pf1550_charger_irqs[i].virq)
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irq_type = pf1550_charger_irqs[i].irq;
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switch (irq_type) {
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case PF1550_CHARG_IRQ_BAT2SOCI:
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dev_info(chg->dev, "BAT to SYS Overcurrent interrupt.\n");
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break;
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case PF1550_CHARG_IRQ_BATI:
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pf1550_chg_bat_isr(chg);
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break;
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case PF1550_CHARG_IRQ_CHGI:
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pf1550_chg_chg_isr(chg);
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break;
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case PF1550_CHARG_IRQ_VBUSI:
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pf1550_chg_vbus_isr(chg);
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break;
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case PF1550_CHARG_IRQ_THMI:
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dev_info(chg->dev, "Thermal interrupt.\n");
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break;
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default:
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dev_err(chg->dev, "unknown interrupt occurred.\n");
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}
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if (regmap_read(chg->pf1550->regmap, PF1550_CHARG_REG_CHG_INT, &status))
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dev_err(chg->dev, "Read CHG_INT error.\n");
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if (regmap_write(chg->pf1550->regmap, PF1550_CHARG_REG_CHG_INT, status))
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dev_err(chg->dev, "clear CHG_INT error.\n");
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mutex_unlock(&chg->mutex);
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}
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static enum power_supply_property pf1550_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_HEALTH,
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POWER_SUPPLY_PROP_PRESENT,
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POWER_SUPPLY_PROP_ONLINE,
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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 pf1550_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 pf1550_charger *chg = power_supply_get_drvdata(psy);
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struct regmap *regmap = chg->pf1550->regmap;
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int ret = 0;
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switch (psp) {
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case POWER_SUPPLY_PROP_STATUS:
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ret = pf1550_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 = pf1550_get_charge_type(regmap, &val->intval);
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break;
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case POWER_SUPPLY_PROP_HEALTH:
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ret = pf1550_get_battery_health(regmap, &val->intval);
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break;
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case POWER_SUPPLY_PROP_PRESENT:
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ret = pf1550_get_present(regmap, &val->intval);
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break;
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case POWER_SUPPLY_PROP_ONLINE:
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ret = pf1550_get_online(regmap, &val->intval);
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break;
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case POWER_SUPPLY_PROP_MODEL_NAME:
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val->strval = pf1550_charger_model;
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break;
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case POWER_SUPPLY_PROP_MANUFACTURER:
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val->strval = pf1550_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 int pf1550_set_constant_volt(struct pf1550_charger *chg,
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unsigned int uvolt)
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{
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unsigned int data;
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if (uvolt >= 3500000 && uvolt <= 4440000)
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data = 8 + (uvolt - 3500000) / 20000;
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else {
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dev_err(chg->dev, "Wrong value for constant voltage\n");
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return -EINVAL;
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}
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dev_dbg(chg->dev, "Charging constant voltage: %u (0x%x)\n", uvolt,
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data);
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return regmap_update_bits(chg->pf1550->regmap,
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PF1550_CHARG_REG_BATT_REG,
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PF1550_CHARG_REG_BATT_REG_CHGCV_MASK, data);
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}
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static int pf1550_set_min_system_volt(struct pf1550_charger *chg,
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unsigned int uvolt)
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{
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unsigned int data;
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switch (uvolt) {
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case 3500000:
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data = 0x0;
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break;
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case 3700000:
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data = 0x1;
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break;
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case 4300000:
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data = 0x2;
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break;
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default:
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dev_err(chg->dev, "Wrong value for minimum system voltage\n");
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return -EINVAL;
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}
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data <<= PF1550_CHARG_REG_BATT_REG_VMINSYS_SHIFT;
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dev_dbg(chg->dev, "Minimum system regulation voltage: %u (0x%x)\n",
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uvolt, data);
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return regmap_update_bits(chg->pf1550->regmap,
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PF1550_CHARG_REG_BATT_REG,
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PF1550_CHARG_REG_BATT_REG_VMINSYS_MASK, data);
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}
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static int pf1550_set_thermal_regulation_temp(struct pf1550_charger *chg,
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unsigned int cels)
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{
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unsigned int data;
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switch (cels) {
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case 60:
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data = 0x0;
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break;
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case 75:
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data = 0x1;
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break;
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case 90:
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data = 0x2;
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break;
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case 105:
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data = 0x3;
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break;
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default:
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dev_err(chg->dev, "Wrong value for thermal temperature\n");
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return -EINVAL;
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}
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data <<= PF1550_CHARG_REG_THM_REG_CNFG_REGTEMP_SHIFT;
|
|
|
|
dev_dbg(chg->dev, "Thermal regulation loop temperature: %u (0x%x)\n",
|
|
cels, data);
|
|
|
|
return regmap_update_bits(chg->pf1550->regmap,
|
|
PF1550_CHARG_REG_THM_REG_CNFG,
|
|
PF1550_CHARG_REG_THM_REG_CNFG_REGTEMP_MASK, data);
|
|
}
|
|
|
|
/*
|
|
* Sets charger registers to proper and safe default values.
|
|
*/
|
|
static int pf1550_reg_init(struct pf1550_charger *chg)
|
|
{
|
|
int ret;
|
|
unsigned int data;
|
|
|
|
/* Unmask charger interrupt, mask DPMI and reserved bit */
|
|
ret = regmap_write(chg->pf1550->regmap, PF1550_CHARG_REG_CHG_INT_MASK,
|
|
0x51);
|
|
if (ret) {
|
|
dev_err(chg->dev, "Error unmask charger interrupt: %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
ret = regmap_read(chg->pf1550->regmap, PF1550_CHARG_REG_VBUS_SNS,
|
|
&data);
|
|
if (ret) {
|
|
dev_err(chg->dev, "Read charg vbus_sns error: %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
if (data & PF1550_VBUS_VALID)
|
|
chg->psy_desc.type = POWER_SUPPLY_TYPE_MAINS;
|
|
|
|
ret = pf1550_set_constant_volt(chg, chg->constant_volt);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = pf1550_set_min_system_volt(chg, chg->min_system_volt);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = pf1550_set_thermal_regulation_temp(chg,
|
|
chg->thermal_regulation_temp);
|
|
if (ret)
|
|
return ret;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int pf1550_dt_init(struct device *dev, struct pf1550_charger *chg)
|
|
{
|
|
struct device_node *np = dev->of_node;
|
|
|
|
if (!np) {
|
|
dev_err(dev, "no charger OF node\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (of_property_read_u32(np, "fsl,constant-microvolt",
|
|
&chg->constant_volt))
|
|
chg->constant_volt = PF1550_DEFAULT_CONSTANT_VOLT;
|
|
|
|
if (of_property_read_u32(np, "fsl,min-system-microvolt",
|
|
&chg->min_system_volt))
|
|
chg->min_system_volt = PF1550_DEFAULT_MIN_SYSTEM_VOLT;
|
|
|
|
if (of_property_read_u32(np, "fsl,thermal-regulation",
|
|
&chg->thermal_regulation_temp))
|
|
chg->thermal_regulation_temp = PF1550_DEFAULT_THERMAL_TEMP;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int pf1550_charger_probe(struct platform_device *pdev)
|
|
{
|
|
struct pf1550_charger *chg;
|
|
struct power_supply_config psy_cfg = {};
|
|
struct pf1550_dev *pf1550 = dev_get_drvdata(pdev->dev.parent);
|
|
int i, ret;
|
|
|
|
chg = devm_kzalloc(&pdev->dev, sizeof(*chg), GFP_KERNEL);
|
|
if (!chg)
|
|
return -ENOMEM;
|
|
|
|
chg->dev = &pdev->dev;
|
|
chg->pf1550 = pf1550;
|
|
|
|
platform_set_drvdata(pdev, chg);
|
|
|
|
ret = pf1550_dt_init(&pdev->dev, chg);
|
|
if (ret)
|
|
return ret;
|
|
|
|
mutex_init(&chg->mutex);
|
|
|
|
INIT_DELAYED_WORK(&chg->irq_work, pf1550_charger_irq_work);
|
|
|
|
for (i = 0; i < ARRAY_SIZE(pf1550_charger_irqs); i++) {
|
|
struct pf1550_irq_info *charger_irq =
|
|
&pf1550_charger_irqs[i];
|
|
unsigned int virq = 0;
|
|
|
|
virq = regmap_irq_get_virq(pf1550->irq_data_charger,
|
|
charger_irq->irq);
|
|
if (!virq)
|
|
return -EINVAL;
|
|
|
|
charger_irq->virq = virq;
|
|
|
|
ret = devm_request_threaded_irq(&pdev->dev, virq, NULL,
|
|
pf1550_charger_irq_handler,
|
|
IRQF_NO_SUSPEND,
|
|
charger_irq->name, chg);
|
|
if (ret) {
|
|
dev_err(&pdev->dev,
|
|
"failed: irq request (IRQ: %d, error :%d)\n",
|
|
charger_irq->irq, ret);
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
psy_cfg.drv_data = chg;
|
|
|
|
chg->psy_desc.name = PF1550_CHARGER_NAME;
|
|
chg->psy_desc.type = POWER_SUPPLY_TYPE_BATTERY;
|
|
chg->psy_desc.get_property = pf1550_charger_get_property;
|
|
chg->psy_desc.properties = pf1550_charger_props;
|
|
chg->psy_desc.num_properties = ARRAY_SIZE(pf1550_charger_props);
|
|
|
|
chg->charger = power_supply_register(&pdev->dev, &chg->psy_desc,
|
|
&psy_cfg);
|
|
if (IS_ERR(chg->charger)) {
|
|
dev_err(&pdev->dev, "failed: power supply register\n");
|
|
ret = PTR_ERR(chg->charger);
|
|
return ret;
|
|
}
|
|
|
|
ret = pf1550_reg_init(chg);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int pf1550_charger_remove(struct platform_device *pdev)
|
|
{
|
|
struct pf1550_charger *chg = platform_get_drvdata(pdev);
|
|
|
|
cancel_delayed_work_sync(&chg->irq_work);
|
|
power_supply_unregister(chg->charger);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct platform_device_id pf1550_charger_id[] = {
|
|
{ "pf1550-charger", 0, },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(platform, pf1550_charger_id);
|
|
|
|
static struct platform_driver pf1550_charger_driver = {
|
|
.driver = {
|
|
.name = "pf1550-charger",
|
|
},
|
|
.probe = pf1550_charger_probe,
|
|
.remove = pf1550_charger_remove,
|
|
.id_table = pf1550_charger_id,
|
|
};
|
|
module_platform_driver(pf1550_charger_driver);
|
|
|
|
MODULE_AUTHOR("Robin Gong <yibin.gong@freescale.com>");
|
|
MODULE_DESCRIPTION("PF1550 charger driver");
|
|
MODULE_LICENSE("GPL");
|