649 lines
16 KiB
C
649 lines
16 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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//
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// max14577_charger.c - Battery charger driver for the Maxim 14577/77836
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//
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// Copyright (C) 2013,2014 Samsung Electronics
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// Krzysztof Kozlowski <krzk@kernel.org>
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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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#include <linux/mfd/max14577.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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struct max14577_charger_platform_data *pdata;
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};
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/*
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* Helper function for mapping values of STATUS2/CHGTYP register on max14577
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* and max77836 chipsets to enum maxim_muic_charger_type.
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*/
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static enum max14577_muic_charger_type maxim_get_charger_type(
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enum maxim_device_type dev_type, u8 val) {
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switch (val) {
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case MAX14577_CHARGER_TYPE_NONE:
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case MAX14577_CHARGER_TYPE_USB:
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case MAX14577_CHARGER_TYPE_DOWNSTREAM_PORT:
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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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return val;
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case MAX14577_CHARGER_TYPE_DEAD_BATTERY:
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case MAX14577_CHARGER_TYPE_RESERVED:
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if (dev_type == MAXIM_DEVICE_TYPE_MAX77836)
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val |= 0x8;
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return val;
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default:
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WARN_ONCE(1, "max14577: Unsupported chgtyp register value 0x%02x", val);
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return val;
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}
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}
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static int max14577_get_charger_state(struct max14577_charger *chg, int *val)
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{
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struct regmap *rmap = chg->max14577->regmap;
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int ret;
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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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ret = max14577_read_reg(rmap, MAX14577_CHG_REG_CHG_CTRL2, ®_data);
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if (ret < 0)
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goto out;
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if ((reg_data & CHGCTRL2_MBCHOSTEN_MASK) == 0) {
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*val = POWER_SUPPLY_STATUS_DISCHARGING;
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goto out;
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}
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ret = max14577_read_reg(rmap, MAX14577_CHG_REG_STATUS3, ®_data);
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if (ret < 0)
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goto out;
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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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*val = POWER_SUPPLY_STATUS_FULL;
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else
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*val = POWER_SUPPLY_STATUS_CHARGING;
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goto out;
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}
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*val = POWER_SUPPLY_STATUS_DISCHARGING;
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out:
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return ret;
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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, int *val)
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{
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int ret, charging;
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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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ret = max14577_get_charger_state(chg, &charging);
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if (ret < 0)
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return ret;
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if (charging == POWER_SUPPLY_STATUS_CHARGING)
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*val = POWER_SUPPLY_CHARGE_TYPE_FAST;
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else
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*val = POWER_SUPPLY_CHARGE_TYPE_NONE;
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return 0;
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}
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static int max14577_get_online(struct max14577_charger *chg, int *val)
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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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int ret;
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enum max14577_muic_charger_type chg_type;
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ret = max14577_read_reg(rmap, MAX14577_MUIC_REG_STATUS2, ®_data);
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if (ret < 0)
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return ret;
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reg_data = ((reg_data & STATUS2_CHGTYP_MASK) >> STATUS2_CHGTYP_SHIFT);
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chg_type = maxim_get_charger_type(chg->max14577->dev_type, reg_data);
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switch (chg_type) {
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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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case MAX77836_CHARGER_TYPE_SPECIAL_BIAS:
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*val = 1;
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break;
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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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case MAX77836_CHARGER_TYPE_RESERVED:
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default:
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*val = 0;
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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_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, int *val)
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{
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struct regmap *rmap = chg->max14577->regmap;
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int ret;
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u8 reg_data;
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enum max14577_muic_charger_type chg_type;
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ret = max14577_read_reg(rmap, MAX14577_MUIC_REG_STATUS2, ®_data);
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if (ret < 0)
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goto out;
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reg_data = ((reg_data & STATUS2_CHGTYP_MASK) >> STATUS2_CHGTYP_SHIFT);
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chg_type = maxim_get_charger_type(chg->max14577->dev_type, reg_data);
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if (chg_type == MAX14577_CHARGER_TYPE_DEAD_BATTERY) {
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*val = POWER_SUPPLY_HEALTH_DEAD;
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goto out;
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}
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ret = max14577_read_reg(rmap, MAX14577_CHG_REG_STATUS3, ®_data);
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if (ret < 0)
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goto out;
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if (reg_data & STATUS3_OVP_MASK) {
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*val = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
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goto out;
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}
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/* Not dead, not overvoltage */
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*val = POWER_SUPPLY_HEALTH_GOOD;
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out:
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return ret;
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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, int *val)
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{
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*val = 1;
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return 0;
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}
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static int max14577_set_fast_charge_timer(struct max14577_charger *chg,
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unsigned long hours)
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{
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u8 reg_data;
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switch (hours) {
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case 5 ... 7:
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reg_data = hours - 3;
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break;
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case 0:
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/* Disable */
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reg_data = 0x7;
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break;
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default:
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dev_err(chg->dev, "Wrong value for Fast-Charge Timer: %lu\n",
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hours);
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return -EINVAL;
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}
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reg_data <<= CHGCTRL1_TCHW_SHIFT;
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return max14577_update_reg(chg->max14577->regmap,
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MAX14577_REG_CHGCTRL1, CHGCTRL1_TCHW_MASK, reg_data);
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}
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static int max14577_init_constant_voltage(struct max14577_charger *chg,
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unsigned int uvolt)
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{
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u8 reg_data;
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if (uvolt < MAXIM_CHARGER_CONSTANT_VOLTAGE_MIN ||
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uvolt > MAXIM_CHARGER_CONSTANT_VOLTAGE_MAX)
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return -EINVAL;
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if (uvolt == 4200000)
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reg_data = 0x0;
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else if (uvolt == MAXIM_CHARGER_CONSTANT_VOLTAGE_MAX)
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reg_data = 0x1f;
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else if (uvolt <= 4280000) {
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unsigned int val = uvolt;
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val -= MAXIM_CHARGER_CONSTANT_VOLTAGE_MIN;
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val /= MAXIM_CHARGER_CONSTANT_VOLTAGE_STEP;
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if (uvolt <= 4180000)
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reg_data = 0x1 + val;
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else
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reg_data = val; /* Fix for gap between 4.18V and 4.22V */
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} else
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return -EINVAL;
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reg_data <<= CHGCTRL3_MBCCVWRC_SHIFT;
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return max14577_write_reg(chg->max14577->regmap,
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MAX14577_CHG_REG_CHG_CTRL3, reg_data);
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}
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static int max14577_init_eoc(struct max14577_charger *chg,
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unsigned int uamp)
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{
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unsigned int current_bits;
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u8 reg_data;
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switch (chg->max14577->dev_type) {
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case MAXIM_DEVICE_TYPE_MAX77836:
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if (uamp < 5000)
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return -EINVAL; /* Requested current is too low */
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if (uamp >= 7500 && uamp < 10000)
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current_bits = 0x0;
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else if (uamp <= 50000) {
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/* <5000, 7499> and <10000, 50000> */
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current_bits = uamp / 5000;
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} else {
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uamp = min(uamp, 100000U) - 50000U;
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current_bits = 0xa + uamp / 10000;
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}
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break;
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case MAXIM_DEVICE_TYPE_MAX14577:
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default:
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if (uamp < MAX14577_CHARGER_EOC_CURRENT_LIMIT_MIN)
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return -EINVAL; /* Requested current is too low */
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uamp = min(uamp, MAX14577_CHARGER_EOC_CURRENT_LIMIT_MAX);
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uamp -= MAX14577_CHARGER_EOC_CURRENT_LIMIT_MIN;
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current_bits = uamp / MAX14577_CHARGER_EOC_CURRENT_LIMIT_STEP;
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break;
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}
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reg_data = current_bits << CHGCTRL5_EOCS_SHIFT;
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return max14577_update_reg(chg->max14577->regmap,
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MAX14577_CHG_REG_CHG_CTRL5, CHGCTRL5_EOCS_MASK,
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reg_data);
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}
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static int max14577_init_fast_charge(struct max14577_charger *chg,
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unsigned int uamp)
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{
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u8 reg_data;
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int ret;
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const struct maxim_charger_current *limits =
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&maxim_charger_currents[chg->max14577->dev_type];
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ret = maxim_charger_calc_reg_current(limits, uamp, uamp, ®_data);
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if (ret) {
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dev_err(chg->dev, "Wrong value for fast charge: %u\n", uamp);
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return ret;
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}
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return max14577_update_reg(chg->max14577->regmap,
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MAX14577_CHG_REG_CHG_CTRL4,
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CHGCTRL4_MBCICHWRCL_MASK | CHGCTRL4_MBCICHWRCH_MASK,
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reg_data);
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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 int 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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int ret;
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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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/*
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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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/* 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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ret = max14577_init_constant_voltage(chg, chg->pdata->constant_uvolt);
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if (ret)
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return ret;
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ret = max14577_init_eoc(chg, chg->pdata->eoc_uamp);
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if (ret)
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return ret;
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ret = max14577_init_fast_charge(chg, chg->pdata->fast_charge_uamp);
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if (ret)
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return ret;
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ret = max14577_set_fast_charge_timer(chg,
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MAXIM_CHARGER_FAST_CHARGE_TIMER_DEFAULT);
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if (ret)
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return ret;
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/* Initialize Overvoltage-Protection Threshold */
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switch (chg->pdata->ovp_uvolt) {
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case 7500000:
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reg_data = 0x0;
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break;
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case 6000000:
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case 6500000:
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case 7000000:
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reg_data = 0x1 + (chg->pdata->ovp_uvolt - 6000000) / 500000;
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break;
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default:
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dev_err(chg->dev, "Wrong value for OVP: %u\n",
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chg->pdata->ovp_uvolt);
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return -EINVAL;
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}
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reg_data <<= CHGCTRL7_OTPCGHCVS_SHIFT;
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max14577_write_reg(rmap, MAX14577_REG_CHGCTRL7, reg_data);
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return 0;
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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 * const model_names[] = {
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[MAXIM_DEVICE_TYPE_UNKNOWN] = "MAX14577-like",
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[MAXIM_DEVICE_TYPE_MAX14577] = "MAX14577",
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[MAXIM_DEVICE_TYPE_MAX77836] = "MAX77836",
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};
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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 = power_supply_get_drvdata(psy);
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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 = max14577_get_charger_state(chg, &val->intval);
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break;
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case POWER_SUPPLY_PROP_CHARGE_TYPE:
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ret = max14577_get_charge_type(chg, &val->intval);
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break;
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case POWER_SUPPLY_PROP_HEALTH:
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ret = max14577_get_battery_health(chg, &val->intval);
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break;
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case POWER_SUPPLY_PROP_PRESENT:
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ret = max14577_get_present(chg, &val->intval);
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break;
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case POWER_SUPPLY_PROP_ONLINE:
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ret = max14577_get_online(chg, &val->intval);
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break;
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case POWER_SUPPLY_PROP_MODEL_NAME:
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BUILD_BUG_ON(ARRAY_SIZE(model_names) != MAXIM_DEVICE_TYPE_NUM);
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val->strval = model_names[chg->max14577->dev_type];
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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 const struct power_supply_desc max14577_charger_desc = {
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.name = "max14577-charger",
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.type = POWER_SUPPLY_TYPE_BATTERY,
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.properties = max14577_charger_props,
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.num_properties = ARRAY_SIZE(max14577_charger_props),
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.get_property = max14577_charger_get_property,
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};
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#ifdef CONFIG_OF
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static struct max14577_charger_platform_data *max14577_charger_dt_init(
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struct platform_device *pdev)
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{
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struct max14577_charger_platform_data *pdata;
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struct device_node *np = pdev->dev.of_node;
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int ret;
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if (!np) {
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dev_err(&pdev->dev, "No charger OF node\n");
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return ERR_PTR(-EINVAL);
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}
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pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
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if (!pdata)
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return ERR_PTR(-ENOMEM);
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ret = of_property_read_u32(np, "maxim,constant-uvolt",
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&pdata->constant_uvolt);
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if (ret) {
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dev_err(&pdev->dev, "Cannot parse maxim,constant-uvolt field from DT\n");
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return ERR_PTR(ret);
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}
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ret = of_property_read_u32(np, "maxim,fast-charge-uamp",
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&pdata->fast_charge_uamp);
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if (ret) {
|
|
dev_err(&pdev->dev, "Cannot parse maxim,fast-charge-uamp field from DT\n");
|
|
return ERR_PTR(ret);
|
|
}
|
|
|
|
ret = of_property_read_u32(np, "maxim,eoc-uamp", &pdata->eoc_uamp);
|
|
if (ret) {
|
|
dev_err(&pdev->dev, "Cannot parse maxim,eoc-uamp field from DT\n");
|
|
return ERR_PTR(ret);
|
|
}
|
|
|
|
ret = of_property_read_u32(np, "maxim,ovp-uvolt", &pdata->ovp_uvolt);
|
|
if (ret) {
|
|
dev_err(&pdev->dev, "Cannot parse maxim,ovp-uvolt field from DT\n");
|
|
return ERR_PTR(ret);
|
|
}
|
|
|
|
return pdata;
|
|
}
|
|
#else /* CONFIG_OF */
|
|
static struct max14577_charger_platform_data *max14577_charger_dt_init(
|
|
struct platform_device *pdev)
|
|
{
|
|
return NULL;
|
|
}
|
|
#endif /* CONFIG_OF */
|
|
|
|
static ssize_t show_fast_charge_timer(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct max14577_charger *chg = dev_get_drvdata(dev);
|
|
u8 reg_data;
|
|
int ret;
|
|
unsigned int val;
|
|
|
|
ret = max14577_read_reg(chg->max14577->regmap, MAX14577_REG_CHGCTRL1,
|
|
®_data);
|
|
if (ret)
|
|
return ret;
|
|
|
|
reg_data &= CHGCTRL1_TCHW_MASK;
|
|
reg_data >>= CHGCTRL1_TCHW_SHIFT;
|
|
switch (reg_data) {
|
|
case 0x2 ... 0x4:
|
|
val = reg_data + 3;
|
|
break;
|
|
case 0x7:
|
|
val = 0;
|
|
break;
|
|
default:
|
|
val = 5;
|
|
break;
|
|
}
|
|
|
|
return scnprintf(buf, PAGE_SIZE, "%u\n", val);
|
|
}
|
|
|
|
static ssize_t store_fast_charge_timer(struct device *dev,
|
|
struct device_attribute *attr, const char *buf, size_t count)
|
|
{
|
|
struct max14577_charger *chg = dev_get_drvdata(dev);
|
|
unsigned long val;
|
|
int ret;
|
|
|
|
ret = kstrtoul(buf, 10, &val);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = max14577_set_fast_charge_timer(chg, val);
|
|
if (ret)
|
|
return ret;
|
|
|
|
return count;
|
|
}
|
|
|
|
static DEVICE_ATTR(fast_charge_timer, S_IRUGO | S_IWUSR,
|
|
show_fast_charge_timer, store_fast_charge_timer);
|
|
|
|
static int max14577_charger_probe(struct platform_device *pdev)
|
|
{
|
|
struct max14577_charger *chg;
|
|
struct power_supply_config psy_cfg = {};
|
|
struct max14577 *max14577 = dev_get_drvdata(pdev->dev.parent);
|
|
int ret;
|
|
|
|
chg = devm_kzalloc(&pdev->dev, sizeof(*chg), GFP_KERNEL);
|
|
if (!chg)
|
|
return -ENOMEM;
|
|
|
|
platform_set_drvdata(pdev, chg);
|
|
chg->dev = &pdev->dev;
|
|
chg->max14577 = max14577;
|
|
|
|
chg->pdata = max14577_charger_dt_init(pdev);
|
|
if (IS_ERR_OR_NULL(chg->pdata))
|
|
return PTR_ERR(chg->pdata);
|
|
|
|
ret = max14577_charger_reg_init(chg);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = device_create_file(&pdev->dev, &dev_attr_fast_charge_timer);
|
|
if (ret) {
|
|
dev_err(&pdev->dev, "failed: create sysfs entry\n");
|
|
return ret;
|
|
}
|
|
|
|
psy_cfg.drv_data = chg;
|
|
chg->charger = power_supply_register(&pdev->dev, &max14577_charger_desc,
|
|
&psy_cfg);
|
|
if (IS_ERR(chg->charger)) {
|
|
dev_err(&pdev->dev, "failed: power supply register\n");
|
|
ret = PTR_ERR(chg->charger);
|
|
goto err;
|
|
}
|
|
|
|
/* Check for valid values for charger */
|
|
BUILD_BUG_ON(MAX14577_CHARGER_EOC_CURRENT_LIMIT_MIN +
|
|
MAX14577_CHARGER_EOC_CURRENT_LIMIT_STEP * 0xf !=
|
|
MAX14577_CHARGER_EOC_CURRENT_LIMIT_MAX);
|
|
return 0;
|
|
|
|
err:
|
|
device_remove_file(&pdev->dev, &dev_attr_fast_charge_timer);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int max14577_charger_remove(struct platform_device *pdev)
|
|
{
|
|
struct max14577_charger *chg = platform_get_drvdata(pdev);
|
|
|
|
device_remove_file(&pdev->dev, &dev_attr_fast_charge_timer);
|
|
power_supply_unregister(chg->charger);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct platform_device_id max14577_charger_id[] = {
|
|
{ "max14577-charger", MAXIM_DEVICE_TYPE_MAX14577, },
|
|
{ "max77836-charger", MAXIM_DEVICE_TYPE_MAX77836, },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(platform, max14577_charger_id);
|
|
|
|
static const struct of_device_id of_max14577_charger_dt_match[] = {
|
|
{ .compatible = "maxim,max14577-charger",
|
|
.data = (void *)MAXIM_DEVICE_TYPE_MAX14577, },
|
|
{ .compatible = "maxim,max77836-charger",
|
|
.data = (void *)MAXIM_DEVICE_TYPE_MAX77836, },
|
|
{ },
|
|
};
|
|
MODULE_DEVICE_TABLE(of, of_max14577_charger_dt_match);
|
|
|
|
static struct platform_driver max14577_charger_driver = {
|
|
.driver = {
|
|
.name = "max14577-charger",
|
|
.of_match_table = of_max14577_charger_dt_match,
|
|
},
|
|
.probe = max14577_charger_probe,
|
|
.remove = max14577_charger_remove,
|
|
.id_table = max14577_charger_id,
|
|
};
|
|
module_platform_driver(max14577_charger_driver);
|
|
|
|
MODULE_AUTHOR("Krzysztof Kozlowski <krzk@kernel.org>");
|
|
MODULE_DESCRIPTION("Maxim 14577/77836 charger driver");
|
|
MODULE_LICENSE("GPL");
|