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648 lines
16 KiB
648 lines
16 KiB
// 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 <[email protected]> |
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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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/* |
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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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|
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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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|
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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) { |
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dev_err(&pdev->dev, "Cannot parse maxim,fast-charge-uamp 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,eoc-uamp", &pdata->eoc_uamp); |
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if (ret) { |
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dev_err(&pdev->dev, "Cannot parse maxim,eoc-uamp 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,ovp-uvolt", &pdata->ovp_uvolt); |
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if (ret) { |
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dev_err(&pdev->dev, "Cannot parse maxim,ovp-uvolt field from DT\n"); |
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return ERR_PTR(ret); |
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} |
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return pdata; |
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} |
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#else /* 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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return NULL; |
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} |
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#endif /* CONFIG_OF */ |
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|
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static ssize_t show_fast_charge_timer(struct device *dev, |
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struct device_attribute *attr, char *buf) |
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{ |
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struct max14577_charger *chg = dev_get_drvdata(dev); |
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u8 reg_data; |
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int ret; |
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unsigned int val; |
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|
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ret = max14577_read_reg(chg->max14577->regmap, MAX14577_REG_CHGCTRL1, |
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®_data); |
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if (ret) |
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return ret; |
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|
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reg_data &= CHGCTRL1_TCHW_MASK; |
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reg_data >>= CHGCTRL1_TCHW_SHIFT; |
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switch (reg_data) { |
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case 0x2 ... 0x4: |
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val = reg_data + 3; |
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break; |
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case 0x7: |
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val = 0; |
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break; |
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default: |
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val = 5; |
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break; |
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} |
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|
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return scnprintf(buf, PAGE_SIZE, "%u\n", val); |
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} |
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|
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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 <[email protected]>"); |
|
MODULE_DESCRIPTION("Maxim 14577/77836 charger driver"); |
|
MODULE_LICENSE("GPL");
|
|
|