diff options
Diffstat (limited to 'drivers/power/max77693_charger.c')
| -rw-r--r-- | drivers/power/max77693_charger.c | 771 |
1 files changed, 0 insertions, 771 deletions
diff --git a/drivers/power/max77693_charger.c b/drivers/power/max77693_charger.c deleted file mode 100644 index 060cab5ae3aa..000000000000 --- a/drivers/power/max77693_charger.c +++ /dev/null @@ -1,771 +0,0 @@ -/* - * max77693_charger.c - Battery charger driver for the Maxim 77693 - * - * Copyright (C) 2014 Samsung Electronics - * Krzysztof Kozlowski <k.kozlowski@samsung.com> - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2 of the License, or - * (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - */ - -#include <linux/module.h> -#include <linux/platform_device.h> -#include <linux/power_supply.h> -#include <linux/regmap.h> -#include <linux/mfd/max77693.h> -#include <linux/mfd/max77693-common.h> -#include <linux/mfd/max77693-private.h> - -#define MAX77693_CHARGER_NAME "max77693-charger" -static const char *max77693_charger_model = "MAX77693"; -static const char *max77693_charger_manufacturer = "Maxim Integrated"; - -struct max77693_charger { - struct device *dev; - struct max77693_dev *max77693; - struct power_supply *charger; - - u32 constant_volt; - u32 min_system_volt; - u32 thermal_regulation_temp; - u32 batttery_overcurrent; - u32 charge_input_threshold_volt; -}; - -static int max77693_get_charger_state(struct regmap *regmap, int *val) -{ - int ret; - unsigned int data; - - ret = regmap_read(regmap, MAX77693_CHG_REG_CHG_DETAILS_01, &data); - if (ret < 0) - return ret; - - data &= CHG_DETAILS_01_CHG_MASK; - data >>= CHG_DETAILS_01_CHG_SHIFT; - - switch (data) { - case MAX77693_CHARGING_PREQUALIFICATION: - case MAX77693_CHARGING_FAST_CONST_CURRENT: - case MAX77693_CHARGING_FAST_CONST_VOLTAGE: - case MAX77693_CHARGING_TOP_OFF: - /* In high temp the charging current is reduced, but still charging */ - case MAX77693_CHARGING_HIGH_TEMP: - *val = POWER_SUPPLY_STATUS_CHARGING; - break; - case MAX77693_CHARGING_DONE: - *val = POWER_SUPPLY_STATUS_FULL; - break; - case MAX77693_CHARGING_TIMER_EXPIRED: - case MAX77693_CHARGING_THERMISTOR_SUSPEND: - *val = POWER_SUPPLY_STATUS_NOT_CHARGING; - break; - case MAX77693_CHARGING_OFF: - case MAX77693_CHARGING_OVER_TEMP: - case MAX77693_CHARGING_WATCHDOG_EXPIRED: - *val = POWER_SUPPLY_STATUS_DISCHARGING; - break; - case MAX77693_CHARGING_RESERVED: - default: - *val = POWER_SUPPLY_STATUS_UNKNOWN; - } - - return 0; -} - -static int max77693_get_charge_type(struct regmap *regmap, int *val) -{ - int ret; - unsigned int data; - - ret = regmap_read(regmap, MAX77693_CHG_REG_CHG_DETAILS_01, &data); - if (ret < 0) - return ret; - - data &= CHG_DETAILS_01_CHG_MASK; - data >>= CHG_DETAILS_01_CHG_SHIFT; - - switch (data) { - case MAX77693_CHARGING_PREQUALIFICATION: - /* - * Top-off: trickle or fast? In top-off the current varies between - * 100 and 250 mA. It is higher than prequalification current. - */ - case MAX77693_CHARGING_TOP_OFF: - *val = POWER_SUPPLY_CHARGE_TYPE_TRICKLE; - break; - case MAX77693_CHARGING_FAST_CONST_CURRENT: - case MAX77693_CHARGING_FAST_CONST_VOLTAGE: - /* In high temp the charging current is reduced, but still charging */ - case MAX77693_CHARGING_HIGH_TEMP: - *val = POWER_SUPPLY_CHARGE_TYPE_FAST; - break; - case MAX77693_CHARGING_DONE: - case MAX77693_CHARGING_TIMER_EXPIRED: - case MAX77693_CHARGING_THERMISTOR_SUSPEND: - case MAX77693_CHARGING_OFF: - case MAX77693_CHARGING_OVER_TEMP: - case MAX77693_CHARGING_WATCHDOG_EXPIRED: - *val = POWER_SUPPLY_CHARGE_TYPE_NONE; - break; - case MAX77693_CHARGING_RESERVED: - default: - *val = POWER_SUPPLY_CHARGE_TYPE_UNKNOWN; - } - - return 0; -} - -/* - * Supported health statuses: - * - POWER_SUPPLY_HEALTH_DEAD - * - POWER_SUPPLY_HEALTH_GOOD - * - POWER_SUPPLY_HEALTH_OVERVOLTAGE - * - POWER_SUPPLY_HEALTH_SAFETY_TIMER_EXPIRE - * - POWER_SUPPLY_HEALTH_UNKNOWN - * - POWER_SUPPLY_HEALTH_UNSPEC_FAILURE - */ -static int max77693_get_battery_health(struct regmap *regmap, int *val) -{ - int ret; - unsigned int data; - - ret = regmap_read(regmap, MAX77693_CHG_REG_CHG_DETAILS_01, &data); - if (ret < 0) - return ret; - - data &= CHG_DETAILS_01_BAT_MASK; - data >>= CHG_DETAILS_01_BAT_SHIFT; - - switch (data) { - case MAX77693_BATTERY_NOBAT: - *val = POWER_SUPPLY_HEALTH_DEAD; - break; - case MAX77693_BATTERY_PREQUALIFICATION: - case MAX77693_BATTERY_GOOD: - case MAX77693_BATTERY_LOWVOLTAGE: - *val = POWER_SUPPLY_HEALTH_GOOD; - break; - case MAX77693_BATTERY_TIMER_EXPIRED: - /* - * Took longer to charge than expected, charging suspended. - * Damaged battery? - */ - *val = POWER_SUPPLY_HEALTH_SAFETY_TIMER_EXPIRE; - break; - case MAX77693_BATTERY_OVERVOLTAGE: - *val = POWER_SUPPLY_HEALTH_OVERVOLTAGE; - break; - case MAX77693_BATTERY_OVERCURRENT: - *val = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE; - break; - case MAX77693_BATTERY_RESERVED: - default: - *val = POWER_SUPPLY_HEALTH_UNKNOWN; - break; - } - - return 0; -} - -static int max77693_get_present(struct regmap *regmap, int *val) -{ - unsigned int data; - int ret; - - /* - * Read CHG_INT_OK register. High DETBAT bit here should be - * equal to value 0x0 in CHG_DETAILS_01/BAT field. - */ - ret = regmap_read(regmap, MAX77693_CHG_REG_CHG_INT_OK, &data); - if (ret < 0) - return ret; - - *val = (data & CHG_INT_OK_DETBAT_MASK) ? 0 : 1; - - return 0; -} - -static int max77693_get_online(struct regmap *regmap, int *val) -{ - unsigned int data; - int ret; - - ret = regmap_read(regmap, MAX77693_CHG_REG_CHG_INT_OK, &data); - if (ret < 0) - return ret; - - *val = (data & CHG_INT_OK_CHGIN_MASK) ? 1 : 0; - - return 0; -} - -static enum power_supply_property max77693_charger_props[] = { - POWER_SUPPLY_PROP_STATUS, - POWER_SUPPLY_PROP_CHARGE_TYPE, - POWER_SUPPLY_PROP_HEALTH, - POWER_SUPPLY_PROP_PRESENT, - POWER_SUPPLY_PROP_ONLINE, - POWER_SUPPLY_PROP_MODEL_NAME, - POWER_SUPPLY_PROP_MANUFACTURER, -}; - -static int max77693_charger_get_property(struct power_supply *psy, - enum power_supply_property psp, - union power_supply_propval *val) -{ - struct max77693_charger *chg = power_supply_get_drvdata(psy); - struct regmap *regmap = chg->max77693->regmap; - int ret = 0; - - switch (psp) { - case POWER_SUPPLY_PROP_STATUS: - ret = max77693_get_charger_state(regmap, &val->intval); - break; - case POWER_SUPPLY_PROP_CHARGE_TYPE: - ret = max77693_get_charge_type(regmap, &val->intval); - break; - case POWER_SUPPLY_PROP_HEALTH: - ret = max77693_get_battery_health(regmap, &val->intval); - break; - case POWER_SUPPLY_PROP_PRESENT: - ret = max77693_get_present(regmap, &val->intval); - break; - case POWER_SUPPLY_PROP_ONLINE: - ret = max77693_get_online(regmap, &val->intval); - break; - case POWER_SUPPLY_PROP_MODEL_NAME: - val->strval = max77693_charger_model; - break; - case POWER_SUPPLY_PROP_MANUFACTURER: - val->strval = max77693_charger_manufacturer; - break; - default: - return -EINVAL; - } - - return ret; -} - -static const struct power_supply_desc max77693_charger_desc = { - .name = MAX77693_CHARGER_NAME, - .type = POWER_SUPPLY_TYPE_BATTERY, - .properties = max77693_charger_props, - .num_properties = ARRAY_SIZE(max77693_charger_props), - .get_property = max77693_charger_get_property, -}; - -static ssize_t device_attr_store(struct device *dev, - struct device_attribute *attr, const char *buf, size_t count, - int (*fn)(struct max77693_charger *, unsigned long)) -{ - struct max77693_charger *chg = dev_get_drvdata(dev); - unsigned long val; - int ret; - - ret = kstrtoul(buf, 10, &val); - if (ret) - return ret; - - ret = fn(chg, val); - if (ret) - return ret; - - return count; -} - -static ssize_t fast_charge_timer_show(struct device *dev, - struct device_attribute *attr, char *buf) -{ - struct max77693_charger *chg = dev_get_drvdata(dev); - unsigned int data, val; - int ret; - - ret = regmap_read(chg->max77693->regmap, MAX77693_CHG_REG_CHG_CNFG_01, - &data); - if (ret < 0) - return ret; - - data &= CHG_CNFG_01_FCHGTIME_MASK; - data >>= CHG_CNFG_01_FCHGTIME_SHIFT; - switch (data) { - case 0x1 ... 0x7: - /* Starting from 4 hours, step by 2 hours */ - val = 4 + (data - 1) * 2; - break; - case 0x0: - default: - val = 0; - break; - } - - return scnprintf(buf, PAGE_SIZE, "%u\n", val); -} - -static int max77693_set_fast_charge_timer(struct max77693_charger *chg, - unsigned long hours) -{ - unsigned int data; - - /* - * 0x00 - disable - * 0x01 - 4h - * 0x02 - 6h - * ... - * 0x07 - 16h - * Round down odd values. - */ - switch (hours) { - case 4 ... 16: - data = (hours - 4) / 2 + 1; - break; - case 0: - /* Disable */ - data = 0; - break; - default: - return -EINVAL; - } - data <<= CHG_CNFG_01_FCHGTIME_SHIFT; - - return regmap_update_bits(chg->max77693->regmap, - MAX77693_CHG_REG_CHG_CNFG_01, - CHG_CNFG_01_FCHGTIME_MASK, data); -} - -static ssize_t fast_charge_timer_store(struct device *dev, - struct device_attribute *attr, const char *buf, size_t count) -{ - return device_attr_store(dev, attr, buf, count, - max77693_set_fast_charge_timer); -} - -static ssize_t top_off_threshold_current_show(struct device *dev, - struct device_attribute *attr, char *buf) -{ - struct max77693_charger *chg = dev_get_drvdata(dev); - unsigned int data, val; - int ret; - - ret = regmap_read(chg->max77693->regmap, MAX77693_CHG_REG_CHG_CNFG_03, - &data); - if (ret < 0) - return ret; - - data &= CHG_CNFG_03_TOITH_MASK; - data >>= CHG_CNFG_03_TOITH_SHIFT; - - if (data <= 0x04) - val = 100000 + data * 25000; - else - val = data * 50000; - - return scnprintf(buf, PAGE_SIZE, "%u\n", val); -} - -static int max77693_set_top_off_threshold_current(struct max77693_charger *chg, - unsigned long uamp) -{ - unsigned int data; - - if (uamp < 100000 || uamp > 350000) - return -EINVAL; - - if (uamp <= 200000) - data = (uamp - 100000) / 25000; - else - /* (200000, 350000> */ - data = uamp / 50000; - - data <<= CHG_CNFG_03_TOITH_SHIFT; - - return regmap_update_bits(chg->max77693->regmap, - MAX77693_CHG_REG_CHG_CNFG_03, - CHG_CNFG_03_TOITH_MASK, data); -} - -static ssize_t top_off_threshold_current_store(struct device *dev, - struct device_attribute *attr, const char *buf, size_t count) -{ - return device_attr_store(dev, attr, buf, count, - max77693_set_top_off_threshold_current); -} - -static ssize_t top_off_timer_show(struct device *dev, - struct device_attribute *attr, char *buf) -{ - struct max77693_charger *chg = dev_get_drvdata(dev); - unsigned int data, val; - int ret; - - ret = regmap_read(chg->max77693->regmap, MAX77693_CHG_REG_CHG_CNFG_03, - &data); - if (ret < 0) - return ret; - - data &= CHG_CNFG_03_TOTIME_MASK; - data >>= CHG_CNFG_03_TOTIME_SHIFT; - - val = data * 10; - - return scnprintf(buf, PAGE_SIZE, "%u\n", val); -} - -static int max77693_set_top_off_timer(struct max77693_charger *chg, - unsigned long minutes) -{ - unsigned int data; - - if (minutes > 70) - return -EINVAL; - - data = minutes / 10; - data <<= CHG_CNFG_03_TOTIME_SHIFT; - - return regmap_update_bits(chg->max77693->regmap, - MAX77693_CHG_REG_CHG_CNFG_03, - CHG_CNFG_03_TOTIME_MASK, data); -} - -static ssize_t top_off_timer_store(struct device *dev, - struct device_attribute *attr, const char *buf, size_t count) -{ - return device_attr_store(dev, attr, buf, count, - max77693_set_top_off_timer); -} - -static DEVICE_ATTR_RW(fast_charge_timer); -static DEVICE_ATTR_RW(top_off_threshold_current); -static DEVICE_ATTR_RW(top_off_timer); - -static int max77693_set_constant_volt(struct max77693_charger *chg, - unsigned int uvolt) -{ - unsigned int data; - - /* - * 0x00 - 3.650 V - * 0x01 - 3.675 V - * ... - * 0x1b - 4.325 V - * 0x1c - 4.340 V - * 0x1d - 4.350 V - * 0x1e - 4.375 V - * 0x1f - 4.400 V - */ - if (uvolt >= 3650000 && uvolt < 4340000) - data = (uvolt - 3650000) / 25000; - else if (uvolt >= 4340000 && uvolt < 4350000) - data = 0x1c; - else if (uvolt >= 4350000 && uvolt <= 4400000) - data = 0x1d + (uvolt - 4350000) / 25000; - else { - dev_err(chg->dev, "Wrong value for charging constant voltage\n"); - return -EINVAL; - } - - data <<= CHG_CNFG_04_CHGCVPRM_SHIFT; - - dev_dbg(chg->dev, "Charging constant voltage: %u (0x%x)\n", uvolt, - data); - - return regmap_update_bits(chg->max77693->regmap, - MAX77693_CHG_REG_CHG_CNFG_04, - CHG_CNFG_04_CHGCVPRM_MASK, data); -} - -static int max77693_set_min_system_volt(struct max77693_charger *chg, - unsigned int uvolt) -{ - unsigned int data; - - if (uvolt < 3000000 || uvolt > 3700000) { - dev_err(chg->dev, "Wrong value for minimum system regulation voltage\n"); - return -EINVAL; - } - - data = (uvolt - 3000000) / 100000; - - data <<= CHG_CNFG_04_MINVSYS_SHIFT; - - dev_dbg(chg->dev, "Minimum system regulation voltage: %u (0x%x)\n", - uvolt, data); - - return regmap_update_bits(chg->max77693->regmap, - MAX77693_CHG_REG_CHG_CNFG_04, - CHG_CNFG_04_MINVSYS_MASK, data); -} - -static int max77693_set_thermal_regulation_temp(struct max77693_charger *chg, - unsigned int cels) -{ - unsigned int data; - - switch (cels) { - case 70: - case 85: - case 100: - case 115: - data = (cels - 70) / 15; - break; - default: - dev_err(chg->dev, "Wrong value for thermal regulation loop temperature\n"); - return -EINVAL; - } - - data <<= CHG_CNFG_07_REGTEMP_SHIFT; - - dev_dbg(chg->dev, "Thermal regulation loop temperature: %u (0x%x)\n", - cels, data); - - return regmap_update_bits(chg->max77693->regmap, - MAX77693_CHG_REG_CHG_CNFG_07, - CHG_CNFG_07_REGTEMP_MASK, data); -} - -static int max77693_set_batttery_overcurrent(struct max77693_charger *chg, - unsigned int uamp) -{ - unsigned int data; - - if (uamp && (uamp < 2000000 || uamp > 3500000)) { - dev_err(chg->dev, "Wrong value for battery overcurrent\n"); - return -EINVAL; - } - - if (uamp) - data = ((uamp - 2000000) / 250000) + 1; - else - data = 0; /* disable */ - - data <<= CHG_CNFG_12_B2SOVRC_SHIFT; - - dev_dbg(chg->dev, "Battery overcurrent: %u (0x%x)\n", uamp, data); - - return regmap_update_bits(chg->max77693->regmap, - MAX77693_CHG_REG_CHG_CNFG_12, - CHG_CNFG_12_B2SOVRC_MASK, data); -} - -static int max77693_set_charge_input_threshold_volt(struct max77693_charger *chg, - unsigned int uvolt) -{ - unsigned int data; - - switch (uvolt) { - case 4300000: - data = 0x0; - break; - case 4700000: - case 4800000: - case 4900000: - data = (uvolt - 4700000) / 100000; - default: - dev_err(chg->dev, "Wrong value for charge input voltage regulation threshold\n"); - return -EINVAL; - } - - data <<= CHG_CNFG_12_VCHGINREG_SHIFT; - - dev_dbg(chg->dev, "Charge input voltage regulation threshold: %u (0x%x)\n", - uvolt, data); - - return regmap_update_bits(chg->max77693->regmap, - MAX77693_CHG_REG_CHG_CNFG_12, - CHG_CNFG_12_VCHGINREG_MASK, data); -} - -/* - * Sets charger registers to proper and safe default values. - */ -static int max77693_reg_init(struct max77693_charger *chg) -{ - int ret; - unsigned int data; - - /* Unlock charger register protection */ - data = (0x3 << CHG_CNFG_06_CHGPROT_SHIFT); - ret = regmap_update_bits(chg->max77693->regmap, - MAX77693_CHG_REG_CHG_CNFG_06, - CHG_CNFG_06_CHGPROT_MASK, data); - if (ret) { - dev_err(chg->dev, "Error unlocking registers: %d\n", ret); - return ret; - } - - ret = max77693_set_fast_charge_timer(chg, DEFAULT_FAST_CHARGE_TIMER); - if (ret) - return ret; - - ret = max77693_set_top_off_threshold_current(chg, - DEFAULT_TOP_OFF_THRESHOLD_CURRENT); - if (ret) - return ret; - - ret = max77693_set_top_off_timer(chg, DEFAULT_TOP_OFF_TIMER); - if (ret) - return ret; - - ret = max77693_set_constant_volt(chg, chg->constant_volt); - if (ret) - return ret; - - ret = max77693_set_min_system_volt(chg, chg->min_system_volt); - if (ret) - return ret; - - ret = max77693_set_thermal_regulation_temp(chg, - chg->thermal_regulation_temp); - if (ret) - return ret; - - ret = max77693_set_batttery_overcurrent(chg, chg->batttery_overcurrent); - if (ret) - return ret; - - return max77693_set_charge_input_threshold_volt(chg, - chg->charge_input_threshold_volt); -} - -#ifdef CONFIG_OF -static int max77693_dt_init(struct device *dev, struct max77693_charger *chg) -{ - struct device_node *np = dev->of_node; - - if (!np) { - dev_err(dev, "no charger OF node\n"); - return -EINVAL; - } - - if (of_property_read_u32(np, "maxim,constant-microvolt", - &chg->constant_volt)) - chg->constant_volt = DEFAULT_CONSTANT_VOLT; - - if (of_property_read_u32(np, "maxim,min-system-microvolt", - &chg->min_system_volt)) - chg->min_system_volt = DEFAULT_MIN_SYSTEM_VOLT; - - if (of_property_read_u32(np, "maxim,thermal-regulation-celsius", - &chg->thermal_regulation_temp)) - chg->thermal_regulation_temp = DEFAULT_THERMAL_REGULATION_TEMP; - - if (of_property_read_u32(np, "maxim,battery-overcurrent-microamp", - &chg->batttery_overcurrent)) - chg->batttery_overcurrent = DEFAULT_BATTERY_OVERCURRENT; - - if (of_property_read_u32(np, "maxim,charge-input-threshold-microvolt", - &chg->charge_input_threshold_volt)) - chg->charge_input_threshold_volt = - DEFAULT_CHARGER_INPUT_THRESHOLD_VOLT; - - return 0; -} -#else /* CONFIG_OF */ -static int max77693_dt_init(struct device *dev, struct max77693_charger *chg) -{ - return 0; -} -#endif /* CONFIG_OF */ - -static int max77693_charger_probe(struct platform_device *pdev) -{ - struct max77693_charger *chg; - struct power_supply_config psy_cfg = {}; - struct max77693_dev *max77693 = 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->max77693 = max77693; - - ret = max77693_dt_init(&pdev->dev, chg); - if (ret) - return ret; - - ret = max77693_reg_init(chg); - if (ret) - return ret; - - psy_cfg.drv_data = chg; - - ret = device_create_file(&pdev->dev, &dev_attr_fast_charge_timer); - if (ret) { - dev_err(&pdev->dev, "failed: create fast charge timer sysfs entry\n"); - goto err; - } - - ret = device_create_file(&pdev->dev, - &dev_attr_top_off_threshold_current); - if (ret) { - dev_err(&pdev->dev, "failed: create top off current sysfs entry\n"); - goto err; - } - - ret = device_create_file(&pdev->dev, &dev_attr_top_off_timer); - if (ret) { - dev_err(&pdev->dev, "failed: create top off timer sysfs entry\n"); - goto err; - } - - chg->charger = power_supply_register(&pdev->dev, - &max77693_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; - } - - return 0; - -err: - device_remove_file(&pdev->dev, &dev_attr_top_off_timer); - device_remove_file(&pdev->dev, &dev_attr_top_off_threshold_current); - device_remove_file(&pdev->dev, &dev_attr_fast_charge_timer); - - return ret; -} - -static int max77693_charger_remove(struct platform_device *pdev) -{ - struct max77693_charger *chg = platform_get_drvdata(pdev); - - device_remove_file(&pdev->dev, &dev_attr_top_off_timer); - device_remove_file(&pdev->dev, &dev_attr_top_off_threshold_current); - device_remove_file(&pdev->dev, &dev_attr_fast_charge_timer); - - power_supply_unregister(chg->charger); - - return 0; -} - -static const struct platform_device_id max77693_charger_id[] = { - { "max77693-charger", 0, }, - { } -}; -MODULE_DEVICE_TABLE(platform, max77693_charger_id); - -static struct platform_driver max77693_charger_driver = { - .driver = { - .name = "max77693-charger", - }, - .probe = max77693_charger_probe, - .remove = max77693_charger_remove, - .id_table = max77693_charger_id, -}; -module_platform_driver(max77693_charger_driver); - -MODULE_AUTHOR("Krzysztof Kozlowski <k.kozlowski@samsung.com>"); -MODULE_DESCRIPTION("Maxim 77693 charger driver"); -MODULE_LICENSE("GPL"); |