312 lines
8.7 KiB
C
312 lines
8.7 KiB
C
/*
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* Battery charger driver for the Maxim 14577
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*
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* Copyright (C) 2013 Samsung Electronics
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* Krzysztof Kozlowski <k.kozlowski@samsung.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/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/mfd/max14577-private.h>
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struct max14577_charger {
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struct device *dev;
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struct max14577 *max14577;
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struct power_supply charger;
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unsigned int charging_state;
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unsigned int battery_state;
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};
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static int max14577_get_charger_state(struct max14577_charger *chg)
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{
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struct regmap *rmap = chg->max14577->regmap;
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int state = POWER_SUPPLY_STATUS_DISCHARGING;
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u8 reg_data;
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/*
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* Charging occurs only if:
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* - CHGCTRL2/MBCHOSTEN == 1
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* - STATUS2/CGMBC == 1
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*
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* TODO:
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* - handle FULL after Top-off timer (EOC register may be off
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* and the charger won't be charging although MBCHOSTEN is on)
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* - handle properly dead-battery charging (respect timer)
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* - handle timers (fast-charge and prequal) /MBCCHGERR/
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*/
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max14577_read_reg(rmap, MAX14577_CHG_REG_CHG_CTRL2, ®_data);
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if ((reg_data & CHGCTRL2_MBCHOSTEN_MASK) == 0)
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goto state_set;
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max14577_read_reg(rmap, MAX14577_CHG_REG_STATUS3, ®_data);
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if (reg_data & STATUS3_CGMBC_MASK) {
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/* Charger or USB-cable is connected */
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if (reg_data & STATUS3_EOC_MASK)
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state = POWER_SUPPLY_STATUS_FULL;
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else
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state = POWER_SUPPLY_STATUS_CHARGING;
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goto state_set;
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}
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state_set:
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chg->charging_state = state;
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return state;
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}
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/*
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* Supported charge types:
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* - POWER_SUPPLY_CHARGE_TYPE_NONE
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* - POWER_SUPPLY_CHARGE_TYPE_FAST
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*/
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static int max14577_get_charge_type(struct max14577_charger *chg)
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{
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/*
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* TODO: CHARGE_TYPE_TRICKLE (VCHGR_RC or EOC)?
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* As spec says:
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* [after reaching EOC interrupt]
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* "When the battery is fully charged, the 30-minute (typ)
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* top-off timer starts. The device continues to trickle
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* charge the battery until the top-off timer runs out."
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*/
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if (max14577_get_charger_state(chg) == POWER_SUPPLY_STATUS_CHARGING)
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return POWER_SUPPLY_CHARGE_TYPE_FAST;
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return POWER_SUPPLY_CHARGE_TYPE_NONE;
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}
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static int max14577_get_online(struct max14577_charger *chg)
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{
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struct regmap *rmap = chg->max14577->regmap;
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u8 reg_data;
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max14577_read_reg(rmap, MAX14577_MUIC_REG_STATUS2, ®_data);
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reg_data = ((reg_data & STATUS2_CHGTYP_MASK) >> STATUS2_CHGTYP_SHIFT);
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switch (reg_data) {
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case MAX14577_CHARGER_TYPE_USB:
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case MAX14577_CHARGER_TYPE_DEDICATED_CHG:
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case MAX14577_CHARGER_TYPE_SPECIAL_500MA:
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case MAX14577_CHARGER_TYPE_SPECIAL_1A:
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case MAX14577_CHARGER_TYPE_DEAD_BATTERY:
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return 1;
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case MAX14577_CHARGER_TYPE_NONE:
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case MAX14577_CHARGER_TYPE_DOWNSTREAM_PORT:
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case MAX14577_CHARGER_TYPE_RESERVED:
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default:
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return 0;
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}
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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_OVERVOLTAGE
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* - POWER_SUPPLY_HEALTH_GOOD
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*/
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static int max14577_get_battery_health(struct max14577_charger *chg)
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{
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struct regmap *rmap = chg->max14577->regmap;
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int state = POWER_SUPPLY_HEALTH_GOOD;
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u8 reg_data;
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max14577_read_reg(rmap, MAX14577_MUIC_REG_STATUS2, ®_data);
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reg_data = ((reg_data & STATUS2_CHGTYP_MASK) >> STATUS2_CHGTYP_SHIFT);
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if (reg_data == MAX14577_CHARGER_TYPE_DEAD_BATTERY) {
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state = POWER_SUPPLY_HEALTH_DEAD;
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goto state_set;
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}
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max14577_read_reg(rmap, MAX14577_CHG_REG_STATUS3, ®_data);
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if (reg_data & STATUS3_OVP_MASK) {
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state = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
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goto state_set;
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}
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state_set:
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chg->battery_state = state;
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return state;
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}
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/*
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* Always returns 1.
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* The max14577 chip doesn't report any status of battery presence.
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* Lets assume that it will always be used with some battery.
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*/
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static int max14577_get_present(struct max14577_charger *chg)
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{
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return 1;
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}
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/*
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* Sets charger registers to proper and safe default values.
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* Some of these values are equal to defaults in MAX14577E
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* data sheet but there are minor differences.
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*/
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static void max14577_charger_reg_init(struct max14577_charger *chg)
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{
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struct regmap *rmap = chg->max14577->regmap;
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u8 reg_data;
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/*
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* Charger-Type Manual Detection, default off (set CHGTYPMAN to 0)
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* Charger-Detection Enable, default on (set CHGDETEN to 1)
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* Combined mask of CHGDETEN and CHGTYPMAN will zero the CHGTYPMAN bit
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*/
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reg_data = 0x1 << CDETCTRL1_CHGDETEN_SHIFT;
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max14577_update_reg(rmap, MAX14577_REG_CDETCTRL1,
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CDETCTRL1_CHGDETEN_MASK | CDETCTRL1_CHGTYPMAN_MASK,
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reg_data);
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/* Battery Fast-Charge Timer, from SM-V700: 6hrs */
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reg_data = 0x3 << CHGCTRL1_TCHW_SHIFT;
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max14577_write_reg(rmap, MAX14577_REG_CHGCTRL1, reg_data);
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/*
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* Wall-Adapter Rapid Charge, default on
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* Battery-Charger, default on
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*/
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reg_data = 0x1 << CHGCTRL2_VCHGR_RC_SHIFT;
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reg_data |= 0x1 << CHGCTRL2_MBCHOSTEN_SHIFT;
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max14577_write_reg(rmap, MAX14577_REG_CHGCTRL2, reg_data);
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/* Battery-Charger Constant Voltage (CV) Mode, from SM-V700: 4.35V */
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reg_data = 0xf << CHGCTRL3_MBCCVWRC_SHIFT;
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max14577_write_reg(rmap, MAX14577_REG_CHGCTRL3, reg_data);
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/*
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* Fast Battery-Charge Current Low, default 200-950mA
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* Fast Battery-Charge Current High, from SM-V700: 450mA
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*/
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reg_data = 0x1 << CHGCTRL4_MBCICHWRCL_SHIFT;
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reg_data |= 0x5 << CHGCTRL4_MBCICHWRCH_SHIFT;
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max14577_write_reg(rmap, MAX14577_REG_CHGCTRL4, reg_data);
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/* End-of-Charge Current, from SM-V700: 50mA */
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reg_data = 0x0 << CHGCTRL5_EOCS_SHIFT;
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max14577_write_reg(rmap, MAX14577_REG_CHGCTRL5, reg_data);
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/* Auto Charging Stop, default off */
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reg_data = 0x0 << CHGCTRL6_AUTOSTOP_SHIFT;
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max14577_write_reg(rmap, MAX14577_REG_CHGCTRL6, reg_data);
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/* Overvoltage-Protection Threshold, from SM-V700: 6.5V */
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reg_data = 0x2 << CHGCTRL7_OTPCGHCVS_SHIFT;
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max14577_write_reg(rmap, MAX14577_REG_CHGCTRL7, reg_data);
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}
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/* Support property from charger */
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static enum power_supply_property max14577_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 const char *model_name = "MAX14577";
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static const char *manufacturer = "Maxim Integrated";
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static int max14577_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 max14577_charger *chg = container_of(psy,
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struct max14577_charger,
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charger);
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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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val->intval = max14577_get_charger_state(chg);
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break;
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case POWER_SUPPLY_PROP_CHARGE_TYPE:
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val->intval = max14577_get_charge_type(chg);
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break;
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case POWER_SUPPLY_PROP_HEALTH:
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val->intval = max14577_get_battery_health(chg);
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break;
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case POWER_SUPPLY_PROP_PRESENT:
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val->intval = max14577_get_present(chg);
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break;
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case POWER_SUPPLY_PROP_ONLINE:
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val->intval = max14577_get_online(chg);
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break;
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case POWER_SUPPLY_PROP_MODEL_NAME:
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val->strval = model_name;
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break;
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case POWER_SUPPLY_PROP_MANUFACTURER:
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val->strval = 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 max14577_charger_probe(struct platform_device *pdev)
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{
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struct max14577_charger *chg;
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struct max14577 *max14577 = dev_get_drvdata(pdev->dev.parent);
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int ret;
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chg = devm_kzalloc(&pdev->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->dev = &pdev->dev;
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chg->max14577 = max14577;
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max14577_charger_reg_init(chg);
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chg->charger.name = "max14577-charger",
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chg->charger.type = POWER_SUPPLY_TYPE_BATTERY,
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chg->charger.properties = max14577_charger_props,
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chg->charger.num_properties = ARRAY_SIZE(max14577_charger_props),
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chg->charger.get_property = max14577_charger_get_property,
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ret = power_supply_register(&pdev->dev, &chg->charger);
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if (ret) {
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dev_err(&pdev->dev, "failed: power supply register\n");
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return ret;
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}
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return 0;
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}
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static int max14577_charger_remove(struct platform_device *pdev)
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{
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struct max14577_charger *chg = platform_get_drvdata(pdev);
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power_supply_unregister(&chg->charger);
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return 0;
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}
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static struct platform_driver max14577_charger_driver = {
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.driver = {
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.owner = THIS_MODULE,
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.name = "max14577-charger",
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},
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.probe = max14577_charger_probe,
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.remove = max14577_charger_remove,
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};
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module_platform_driver(max14577_charger_driver);
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MODULE_AUTHOR("Krzysztof Kozlowski <k.kozlowski@samsung.com>");
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MODULE_DESCRIPTION("MAXIM 14577 charger driver");
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MODULE_LICENSE("GPL");
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