diff options
Diffstat (limited to 'drivers/power/rt9455_charger.c')
| -rw-r--r-- | drivers/power/rt9455_charger.c | 1751 |
1 files changed, 1751 insertions, 0 deletions
diff --git a/drivers/power/rt9455_charger.c b/drivers/power/rt9455_charger.c new file mode 100644 index 000000000000..7c0c1ffa84ec --- /dev/null +++ b/drivers/power/rt9455_charger.c @@ -0,0 +1,1751 @@ +/* + * Driver for Richtek RT9455WSC battery charger. + * + * Copyright (C) 2015 Intel Corporation + * + * 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/interrupt.h> +#include <linux/delay.h> +#include <linux/of_irq.h> +#include <linux/of_device.h> +#include <linux/pm_runtime.h> +#include <linux/power_supply.h> +#include <linux/i2c.h> +#include <linux/acpi.h> +#include <linux/usb/phy.h> +#include <linux/regmap.h> + +#define RT9455_MANUFACTURER "Richtek" +#define RT9455_MODEL_NAME "RT9455" +#define RT9455_DRIVER_NAME "rt9455-charger" + +#define RT9455_IRQ_NAME "interrupt" + +#define RT9455_PWR_RDY_DELAY 1 /* 1 second */ +#define RT9455_MAX_CHARGING_TIME 21600 /* 6 hrs */ +#define RT9455_BATT_PRESENCE_DELAY 60 /* 60 seconds */ + +#define RT9455_CHARGE_MODE 0x00 +#define RT9455_BOOST_MODE 0x01 + +#define RT9455_FAULT 0x03 + +#define RT9455_IAICR_100MA 0x00 +#define RT9455_IAICR_500MA 0x01 +#define RT9455_IAICR_NO_LIMIT 0x03 + +#define RT9455_CHARGE_DISABLE 0x00 +#define RT9455_CHARGE_ENABLE 0x01 + +#define RT9455_PWR_FAULT 0x00 +#define RT9455_PWR_GOOD 0x01 + +#define RT9455_REG_CTRL1 0x00 /* CTRL1 reg address */ +#define RT9455_REG_CTRL2 0x01 /* CTRL2 reg address */ +#define RT9455_REG_CTRL3 0x02 /* CTRL3 reg address */ +#define RT9455_REG_DEV_ID 0x03 /* DEV_ID reg address */ +#define RT9455_REG_CTRL4 0x04 /* CTRL4 reg address */ +#define RT9455_REG_CTRL5 0x05 /* CTRL5 reg address */ +#define RT9455_REG_CTRL6 0x06 /* CTRL6 reg address */ +#define RT9455_REG_CTRL7 0x07 /* CTRL7 reg address */ +#define RT9455_REG_IRQ1 0x08 /* IRQ1 reg address */ +#define RT9455_REG_IRQ2 0x09 /* IRQ2 reg address */ +#define RT9455_REG_IRQ3 0x0A /* IRQ3 reg address */ +#define RT9455_REG_MASK1 0x0B /* MASK1 reg address */ +#define RT9455_REG_MASK2 0x0C /* MASK2 reg address */ +#define RT9455_REG_MASK3 0x0D /* MASK3 reg address */ + +enum rt9455_fields { + F_STAT, F_BOOST, F_PWR_RDY, F_OTG_PIN_POLARITY, /* CTRL1 reg fields */ + + F_IAICR, F_TE_SHDN_EN, F_HIGHER_OCP, F_TE, F_IAICR_INT, F_HIZ, + F_OPA_MODE, /* CTRL2 reg fields */ + + F_VOREG, F_OTG_PL, F_OTG_EN, /* CTRL3 reg fields */ + + F_VENDOR_ID, F_CHIP_REV, /* DEV_ID reg fields */ + + F_RST, /* CTRL4 reg fields */ + + F_TMR_EN, F_MIVR, F_IPREC, F_IEOC_PERCENTAGE, /* CTRL5 reg fields*/ + + F_IAICR_SEL, F_ICHRG, F_VPREC, /* CTRL6 reg fields */ + + F_BATD_EN, F_CHG_EN, F_VMREG, /* CTRL7 reg fields */ + + F_TSDI, F_VINOVPI, F_BATAB, /* IRQ1 reg fields */ + + F_CHRVPI, F_CHBATOVI, F_CHTERMI, F_CHRCHGI, F_CH32MI, F_CHTREGI, + F_CHMIVRI, /* IRQ2 reg fields */ + + F_BSTBUSOVI, F_BSTOLI, F_BSTLOWVI, F_BST32SI, /* IRQ3 reg fields */ + + F_TSDM, F_VINOVPIM, F_BATABM, /* MASK1 reg fields */ + + F_CHRVPIM, F_CHBATOVIM, F_CHTERMIM, F_CHRCHGIM, F_CH32MIM, F_CHTREGIM, + F_CHMIVRIM, /* MASK2 reg fields */ + + F_BSTVINOVIM, F_BSTOLIM, F_BSTLOWVIM, F_BST32SIM, /* MASK3 reg fields */ + + F_MAX_FIELDS +}; + +static const struct reg_field rt9455_reg_fields[] = { + [F_STAT] = REG_FIELD(RT9455_REG_CTRL1, 4, 5), + [F_BOOST] = REG_FIELD(RT9455_REG_CTRL1, 3, 3), + [F_PWR_RDY] = REG_FIELD(RT9455_REG_CTRL1, 2, 2), + [F_OTG_PIN_POLARITY] = REG_FIELD(RT9455_REG_CTRL1, 1, 1), + + [F_IAICR] = REG_FIELD(RT9455_REG_CTRL2, 6, 7), + [F_TE_SHDN_EN] = REG_FIELD(RT9455_REG_CTRL2, 5, 5), + [F_HIGHER_OCP] = REG_FIELD(RT9455_REG_CTRL2, 4, 4), + [F_TE] = REG_FIELD(RT9455_REG_CTRL2, 3, 3), + [F_IAICR_INT] = REG_FIELD(RT9455_REG_CTRL2, 2, 2), + [F_HIZ] = REG_FIELD(RT9455_REG_CTRL2, 1, 1), + [F_OPA_MODE] = REG_FIELD(RT9455_REG_CTRL2, 0, 0), + + [F_VOREG] = REG_FIELD(RT9455_REG_CTRL3, 2, 7), + [F_OTG_PL] = REG_FIELD(RT9455_REG_CTRL3, 1, 1), + [F_OTG_EN] = REG_FIELD(RT9455_REG_CTRL3, 0, 0), + + [F_VENDOR_ID] = REG_FIELD(RT9455_REG_DEV_ID, 4, 7), + [F_CHIP_REV] = REG_FIELD(RT9455_REG_DEV_ID, 0, 3), + + [F_RST] = REG_FIELD(RT9455_REG_CTRL4, 7, 7), + + [F_TMR_EN] = REG_FIELD(RT9455_REG_CTRL5, 7, 7), + [F_MIVR] = REG_FIELD(RT9455_REG_CTRL5, 4, 5), + [F_IPREC] = REG_FIELD(RT9455_REG_CTRL5, 2, 3), + [F_IEOC_PERCENTAGE] = REG_FIELD(RT9455_REG_CTRL5, 0, 1), + + [F_IAICR_SEL] = REG_FIELD(RT9455_REG_CTRL6, 7, 7), + [F_ICHRG] = REG_FIELD(RT9455_REG_CTRL6, 4, 6), + [F_VPREC] = REG_FIELD(RT9455_REG_CTRL6, 0, 2), + + [F_BATD_EN] = REG_FIELD(RT9455_REG_CTRL7, 6, 6), + [F_CHG_EN] = REG_FIELD(RT9455_REG_CTRL7, 4, 4), + [F_VMREG] = REG_FIELD(RT9455_REG_CTRL7, 0, 3), + + [F_TSDI] = REG_FIELD(RT9455_REG_IRQ1, 7, 7), + [F_VINOVPI] = REG_FIELD(RT9455_REG_IRQ1, 6, 6), + [F_BATAB] = REG_FIELD(RT9455_REG_IRQ1, 0, 0), + + [F_CHRVPI] = REG_FIELD(RT9455_REG_IRQ2, 7, 7), + [F_CHBATOVI] = REG_FIELD(RT9455_REG_IRQ2, 5, 5), + [F_CHTERMI] = REG_FIELD(RT9455_REG_IRQ2, 4, 4), + [F_CHRCHGI] = REG_FIELD(RT9455_REG_IRQ2, 3, 3), + [F_CH32MI] = REG_FIELD(RT9455_REG_IRQ2, 2, 2), + [F_CHTREGI] = REG_FIELD(RT9455_REG_IRQ2, 1, 1), + [F_CHMIVRI] = REG_FIELD(RT9455_REG_IRQ2, 0, 0), + + [F_BSTBUSOVI] = REG_FIELD(RT9455_REG_IRQ3, 7, 7), + [F_BSTOLI] = REG_FIELD(RT9455_REG_IRQ3, 6, 6), + [F_BSTLOWVI] = REG_FIELD(RT9455_REG_IRQ3, 5, 5), + [F_BST32SI] = REG_FIELD(RT9455_REG_IRQ3, 3, 3), + + [F_TSDM] = REG_FIELD(RT9455_REG_MASK1, 7, 7), + [F_VINOVPIM] = REG_FIELD(RT9455_REG_MASK1, 6, 6), + [F_BATABM] = REG_FIELD(RT9455_REG_MASK1, 0, 0), + + [F_CHRVPIM] = REG_FIELD(RT9455_REG_MASK2, 7, 7), + [F_CHBATOVIM] = REG_FIELD(RT9455_REG_MASK2, 5, 5), + [F_CHTERMIM] = REG_FIELD(RT9455_REG_MASK2, 4, 4), + [F_CHRCHGIM] = REG_FIELD(RT9455_REG_MASK2, 3, 3), + [F_CH32MIM] = REG_FIELD(RT9455_REG_MASK2, 2, 2), + [F_CHTREGIM] = REG_FIELD(RT9455_REG_MASK2, 1, 1), + [F_CHMIVRIM] = REG_FIELD(RT9455_REG_MASK2, 0, 0), + + [F_BSTVINOVIM] = REG_FIELD(RT9455_REG_MASK3, 7, 7), + [F_BSTOLIM] = REG_FIELD(RT9455_REG_MASK3, 6, 6), + [F_BSTLOWVIM] = REG_FIELD(RT9455_REG_MASK3, 5, 5), + [F_BST32SIM] = REG_FIELD(RT9455_REG_MASK3, 3, 3), +}; + +#define GET_MASK(fid) (BIT(rt9455_reg_fields[fid].msb + 1) - \ + BIT(rt9455_reg_fields[fid].lsb)) + +/* + * Each array initialised below shows the possible real-world values for a + * group of bits belonging to RT9455 registers. The arrays are sorted in + * ascending order. The index of each real-world value represents the value + * that is encoded in the group of bits belonging to RT9455 registers. + */ +/* REG06[6:4] (ICHRG) in uAh */ +static const int rt9455_ichrg_values[] = { + 500000, 650000, 800000, 950000, 1100000, 1250000, 1400000, 1550000 +}; + +/* + * When the charger is in charge mode, REG02[7:2] represent battery regulation + * voltage. + */ +/* REG02[7:2] (VOREG) in uV */ +static const int rt9455_voreg_values[] = { + 3500000, 3520000, 3540000, 3560000, 3580000, 3600000, 3620000, 3640000, + 3660000, 3680000, 3700000, 3720000, 3740000, 3760000, 3780000, 3800000, + 3820000, 3840000, 3860000, 3880000, 3900000, 3920000, 3940000, 3960000, + 3980000, 4000000, 4020000, 4040000, 4060000, 4080000, 4100000, 4120000, + 4140000, 4160000, 4180000, 4200000, 4220000, 4240000, 4260000, 4280000, + 4300000, 4330000, 4350000, 4370000, 4390000, 4410000, 4430000, 4450000, + 4450000, 4450000, 4450000, 4450000, 4450000, 4450000, 4450000, 4450000, + 4450000, 4450000, 4450000, 4450000, 4450000, 4450000, 4450000, 4450000 +}; + +/* + * When the charger is in boost mode, REG02[7:2] represent boost output + * voltage. + */ +/* REG02[7:2] (Boost output voltage) in uV */ +static const int rt9455_boost_voltage_values[] = { + 4425000, 4450000, 4475000, 4500000, 4525000, 4550000, 4575000, 4600000, + 4625000, 4650000, 4675000, 4700000, 4725000, 4750000, 4775000, 4800000, + 4825000, 4850000, 4875000, 4900000, 4925000, 4950000, 4975000, 5000000, + 5025000, 5050000, 5075000, 5100000, 5125000, 5150000, 5175000, 5200000, + 5225000, 5250000, 5275000, 5300000, 5325000, 5350000, 5375000, 5400000, + 5425000, 5450000, 5475000, 5500000, 5525000, 5550000, 5575000, 5600000, + 5600000, 5600000, 5600000, 5600000, 5600000, 5600000, 5600000, 5600000, + 5600000, 5600000, 5600000, 5600000, 5600000, 5600000, 5600000, 5600000, +}; + +/* REG07[3:0] (VMREG) in uV */ +static const int rt9455_vmreg_values[] = { + 4200000, 4220000, 4240000, 4260000, 4280000, 4300000, 4320000, 4340000, + 4360000, 4380000, 4400000, 4430000, 4450000, 4450000, 4450000, 4450000 +}; + +/* REG05[5:4] (IEOC_PERCENTAGE) */ +static const int rt9455_ieoc_percentage_values[] = { + 10, 30, 20, 30 +}; + +/* REG05[1:0] (MIVR) in uV */ +static const int rt9455_mivr_values[] = { + 4000000, 4250000, 4500000, 5000000 +}; + +/* REG05[1:0] (IAICR) in uA */ +static const int rt9455_iaicr_values[] = { + 100000, 500000, 1000000, 2000000 +}; + +struct rt9455_info { + struct i2c_client *client; + struct regmap *regmap; + struct regmap_field *regmap_fields[F_MAX_FIELDS]; + struct power_supply *charger; +#if IS_ENABLED(CONFIG_USB_PHY) + struct usb_phy *usb_phy; + struct notifier_block nb; +#endif + struct delayed_work pwr_rdy_work; + struct delayed_work max_charging_time_work; + struct delayed_work batt_presence_work; + u32 voreg; + u32 boost_voltage; +}; + +/* + * Iterate through each element of the 'tbl' array until an element whose value + * is greater than v is found. Return the index of the respective element, + * or the index of the last element in the array, if no such element is found. + */ +static unsigned int rt9455_find_idx(const int tbl[], int tbl_size, int v) +{ + int i; + + /* + * No need to iterate until the last index in the table because + * if no element greater than v is found in the table, + * or if only the last element is greater than v, + * function returns the index of the last element. + */ + for (i = 0; i < tbl_size - 1; i++) + if (v <= tbl[i]) + return i; + + return (tbl_size - 1); +} + +static int rt9455_get_field_val(struct rt9455_info *info, + enum rt9455_fields field, + const int tbl[], int tbl_size, int *val) +{ + unsigned int v; + int ret; + + ret = regmap_field_read(info->regmap_fields[field], &v); + if (ret) + return ret; + + v = (v >= tbl_size) ? (tbl_size - 1) : v; + *val = tbl[v]; + + return 0; +} + +static int rt9455_set_field_val(struct rt9455_info *info, + enum rt9455_fields field, + const int tbl[], int tbl_size, int val) +{ + unsigned int idx = rt9455_find_idx(tbl, tbl_size, val); + + return regmap_field_write(info->regmap_fields[field], idx); +} + +static int rt9455_register_reset(struct rt9455_info *info) +{ + struct device *dev = &info->client->dev; + unsigned int v; + int ret, limit = 100; + + ret = regmap_field_write(info->regmap_fields[F_RST], 0x01); + if (ret) { + dev_err(dev, "Failed to set RST bit\n"); + return ret; + } + + /* + * To make sure that reset operation has finished, loop until RST bit + * is set to 0. + */ + do { + ret = regmap_field_read(info->regmap_fields[F_RST], &v); + if (ret) { + dev_err(dev, "Failed to read RST bit\n"); + return ret; + } + + if (!v) + break; + + usleep_range(10, 100); + } while (--limit); + + if (!limit) + return -EIO; + + return 0; +} + +/* Charger power supply property routines */ +static enum power_supply_property rt9455_charger_properties[] = { + POWER_SUPPLY_PROP_STATUS, + POWER_SUPPLY_PROP_HEALTH, + POWER_SUPPLY_PROP_PRESENT, + POWER_SUPPLY_PROP_ONLINE, + POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT, + POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX, + POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE, + POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX, + POWER_SUPPLY_PROP_SCOPE, + POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT, + POWER_SUPPLY_PROP_MODEL_NAME, + POWER_SUPPLY_PROP_MANUFACTURER, +}; + +static char *rt9455_charger_supplied_to[] = { + "main-battery", +}; + +static int rt9455_charger_get_status(struct rt9455_info *info, + union power_supply_propval *val) +{ + unsigned int v, pwr_rdy; + int ret; + + ret = regmap_field_read(info->regmap_fields[F_PWR_RDY], + &pwr_rdy); + if (ret) { + dev_err(&info->client->dev, "Failed to read PWR_RDY bit\n"); + return ret; + } + + /* + * If PWR_RDY bit is unset, the battery is discharging. Otherwise, + * STAT bits value must be checked. + */ + if (!pwr_rdy) { + val->intval = POWER_SUPPLY_STATUS_DISCHARGING; + return 0; + } + + ret = regmap_field_read(info->regmap_fields[F_STAT], &v); + if (ret) { + dev_err(&info->client->dev, "Failed to read STAT bits\n"); + return ret; + } + + switch (v) { + case 0: + /* + * If PWR_RDY bit is set, but STAT bits value is 0, the charger + * may be in one of the following cases: + * 1. CHG_EN bit is 0. + * 2. CHG_EN bit is 1 but the battery is not connected. + * In any of these cases, POWER_SUPPLY_STATUS_NOT_CHARGING is + * returned. + */ + val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING; + return 0; + case 1: + val->intval = POWER_SUPPLY_STATUS_CHARGING; + return 0; + case 2: + val->intval = POWER_SUPPLY_STATUS_FULL; + return 0; + default: + val->intval = POWER_SUPPLY_STATUS_UNKNOWN; + return 0; + } +} + +static int rt9455_charger_get_health(struct rt9455_info *info, + union power_supply_propval *val) +{ + struct device *dev = &info->client->dev; + unsigned int v; + int ret; + + val->intval = POWER_SUPPLY_HEALTH_GOOD; + + ret = regmap_read(info->regmap, RT9455_REG_IRQ1, &v); + if (ret) { + dev_err(dev, "Failed to read IRQ1 register\n"); + return ret; + } + + if (v & GET_MASK(F_TSDI)) { + val->intval = POWER_SUPPLY_HEALTH_OVERHEAT; + return 0; + } + if (v & GET_MASK(F_VINOVPI)) { + val->intval = POWER_SUPPLY_HEALTH_OVERVOLTAGE; + return 0; + } + if (v & GET_MASK(F_BATAB)) { + val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE; + return 0; + } + + ret = regmap_read(info->regmap, RT9455_REG_IRQ2, &v); + if (ret) { + dev_err(dev, "Failed to read IRQ2 register\n"); + return ret; + } + + if (v & GET_MASK(F_CHBATOVI)) { + val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE; + return 0; + } + if (v & GET_MASK(F_CH32MI)) { + val->intval = POWER_SUPPLY_HEALTH_SAFETY_TIMER_EXPIRE; + return 0; + } + + ret = regmap_read(info->regmap, RT9455_REG_IRQ3, &v); + if (ret) { + dev_err(dev, "Failed to read IRQ3 register\n"); + return ret; + } + + if (v & GET_MASK(F_BSTBUSOVI)) { + val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE; + return 0; + } + if (v & GET_MASK(F_BSTOLI)) { + val->intval = POWER_SUPPLY_HEALTH_OVERVOLTAGE; + return 0; + } + if (v & GET_MASK(F_BSTLOWVI)) { + val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE; + return 0; + } + if (v & GET_MASK(F_BST32SI)) { + val->intval = POWER_SUPPLY_HEALTH_SAFETY_TIMER_EXPIRE; + return 0; + } + + ret = regmap_field_read(info->regmap_fields[F_STAT], &v); + if (ret) { + dev_err(dev, "Failed to read STAT bits\n"); + return ret; + } + + if (v == RT9455_FAULT) { + val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE; + return 0; + } + + return 0; +} + +static int rt9455_charger_get_battery_presence(struct rt9455_info *info, + union power_supply_propval *val) +{ + unsigned int v; + int ret; + + ret = regmap_field_read(info->regmap_fields[F_BATAB], &v); + if (ret) { + dev_err(&info->client->dev, "Failed to read BATAB bit\n"); + return ret; + } + + /* + * Since BATAB is 1 when battery is NOT present and 0 otherwise, + * !BATAB is returned. + */ + val->intval = !v; + + return 0; +} + +static int rt9455_charger_get_online(struct rt9455_info *info, + union power_supply_propval *val) +{ + unsigned int v; + int ret; + + ret = regmap_field_read(info->regmap_fields[F_PWR_RDY], &v); + if (ret) { + dev_err(&info->client->dev, "Failed to read PWR_RDY bit\n"); + return ret; + } + + val->intval = (int)v; + + return 0; +} + +static int rt9455_charger_get_current(struct rt9455_info *info, + union power_supply_propval *val) +{ + int curr; + int ret; + + ret = rt9455_get_field_val(info, F_ICHRG, + rt9455_ichrg_values, + ARRAY_SIZE(rt9455_ichrg_values), + &curr); + if (ret) { + dev_err(&info->client->dev, "Failed to read ICHRG value\n"); + return ret; + } + + val->intval = curr; + + return 0; +} + +static int rt9455_charger_get_current_max(struct rt9455_info *info, + union power_supply_propval *val) +{ + int idx = ARRAY_SIZE(rt9455_ichrg_values) - 1; + + val->intval = rt9455_ichrg_values[idx]; + + return 0; +} + +static int rt9455_charger_get_voltage(struct rt9455_info *info, + union power_supply_propval *val) +{ + int voltage; + int ret; + + ret = rt9455_get_field_val(info, F_VOREG, + rt9455_voreg_values, + ARRAY_SIZE(rt9455_voreg_values), + &voltage); + if (ret) { + dev_err(&info->client->dev, "Failed to read VOREG value\n"); + return ret; + } + + val->intval = voltage; + + return 0; +} + +static int rt9455_charger_get_voltage_max(struct rt9455_info *info, + union power_supply_propval *val) +{ + int idx = ARRAY_SIZE(rt9455_vmreg_values) - 1; + + val->intval = rt9455_vmreg_values[idx]; + + return 0; +} + +static int rt9455_charger_get_term_current(struct rt9455_info *info, + union power_supply_propval *val) +{ + struct device *dev = &info->client->dev; + int ichrg, ieoc_percentage, ret; + + ret = rt9455_get_field_val(info, F_ICHRG, + rt9455_ichrg_values, + ARRAY_SIZE(rt9455_ichrg_values), + &ichrg); + if (ret) { + dev_err(dev, "Failed to read ICHRG value\n"); + return ret; + } + + ret = rt9455_get_field_val(info, F_IEOC_PERCENTAGE, + rt9455_ieoc_percentage_values, + ARRAY_SIZE(rt9455_ieoc_percentage_values), + &ieoc_percentage); + if (ret) { + dev_err(dev, "Failed to read IEOC value\n"); + return ret; + } + + val->intval = ichrg * ieoc_percentage / 100; + + return 0; +} + +static int rt9455_charger_get_property(struct power_supply *psy, + enum power_supply_property psp, + union power_supply_propval *val) +{ + struct rt9455_info *info = power_supply_get_drvdata(psy); + + switch (psp) { + case POWER_SUPPLY_PROP_STATUS: + return rt9455_charger_get_status(info, val); + case POWER_SUPPLY_PROP_HEALTH: + return rt9455_charger_get_health(info, val); + case POWER_SUPPLY_PROP_PRESENT: + return rt9455_charger_get_battery_presence(info, val); + case POWER_SUPPLY_PROP_ONLINE: + return rt9455_charger_get_online(info, val); + case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT: + return rt9455_charger_get_current(info, val); + case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX: + return rt9455_charger_get_current_max(info, val); + case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE: + return rt9455_charger_get_voltage(info, val); + case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX: + return rt9455_charger_get_voltage_max(info, val); + case POWER_SUPPLY_PROP_SCOPE: + val->intval = POWER_SUPPLY_SCOPE_SYSTEM; + return 0; + case POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT: + return rt9455_charger_get_term_current(info, val); + case POWER_SUPPLY_PROP_MODEL_NAME: + val->strval = RT9455_MODEL_NAME; + return 0; + case POWER_SUPPLY_PROP_MANUFACTURER: + val->strval = RT9455_MANUFACTURER; + return 0; + default: + return -ENODATA; + } +} + +static int rt9455_hw_init(struct rt9455_info *info, u32 ichrg, + u32 ieoc_percentage, + u32 mivr, u32 iaicr) +{ + struct device *dev = &info->client->dev; + int idx, ret; + + ret = rt9455_register_reset(info); + if (ret) { + dev_err(dev, "Power On Reset failed\n"); + return ret; + } + + /* Set TE bit in order to enable end of charge detection */ + ret = regmap_field_write(info->regmap_fields[F_TE], 1); + if (ret) { + dev_err(dev, "Failed to set TE bit\n"); + return ret; + } + + /* Set TE_SHDN_EN bit in order to enable end of charge detection */ + ret = regmap_field_write(info->regmap_fields[F_TE_SHDN_EN], 1); + if (ret) { + dev_err(dev, "Failed to set TE_SHDN_EN bit\n"); + return ret; + } + + /* + * Set BATD_EN bit in order to enable battery detection + * when charging is done + */ + ret = regmap_field_write(info->regmap_fields[F_BATD_EN], 1); + if (ret) { + dev_err(dev, "Failed to set BATD_EN bit\n"); + return ret; + } + + /* + * Disable Safety Timer. In charge mode, this timer terminates charging + * if no read or write via I2C is done within 32 minutes. This timer + * avoids overcharging the baterry when the OS is not loaded and the + * charger is connected to a power source. + * In boost mode, this timer triggers BST32SI interrupt if no read or + * write via I2C is done within 32 seconds. + * When the OS is loaded and the charger driver is inserted, it is used + * delayed_work, named max_charging_time_work, to avoid overcharging + * the battery. + */ + ret = regmap_field_write(info->regmap_fields[F_TMR_EN], 0x00); + if (ret) { + dev_err(dev, "Failed to disable Safety Timer\n"); + return ret; + } + + /* Set ICHRG to value retrieved from device-specific data */ + ret = rt9455_set_field_val(info, F_ICHRG, + rt9455_ichrg_values, + ARRAY_SIZE(rt9455_ichrg_values), ichrg); + if (ret) { + dev_err(dev, "Failed to set ICHRG value\n"); + return ret; + } + + /* Set IEOC Percentage to value retrieved from device-specific data */ + ret = rt9455_set_field_val(info, F_IEOC_PERCENTAGE, + rt9455_ieoc_percentage_values, + ARRAY_SIZE(rt9455_ieoc_percentage_values), + ieoc_percentage); + if (ret) { + dev_err(dev, "Failed to set IEOC Percentage value\n"); + return ret; + } + + /* Set VOREG to value retrieved from device-specific data */ + ret = rt9455_set_field_val(info, F_VOREG, + rt9455_voreg_values, + ARRAY_SIZE(rt9455_voreg_values), + info->voreg); + if (ret) { + dev_err(dev, "Failed to set VOREG value\n"); + return ret; + } + + /* Set VMREG value to maximum (4.45V). */ + idx = ARRAY_SIZE(rt9455_vmreg_values) - 1; + ret = rt9455_set_field_val(info, F_VMREG, + rt9455_vmreg_values, + ARRAY_SIZE(rt9455_vmreg_values), + rt9455_vmreg_values[idx]); + if (ret) { + dev_err(dev, "Failed to set VMREG value\n"); + return ret; + } + + /* + * Set MIVR to value retrieved from device-specific data. + * If no value is specified, default value for MIVR is 4.5V. + */ + if (mivr == -1) + mivr = 4500000; + + ret = rt9455_set_field_val(info, F_MIVR, + rt9455_mivr_values, + ARRAY_SIZE(rt9455_mivr_values), mivr); + if (ret) { + dev_err(dev, "Failed to set MIVR value\n"); + return ret; + } + + /* + * Set IAICR to value retrieved from device-specific data. + * If no value is specified, default value for IAICR is 500 mA. + */ + if (iaicr == -1) + iaicr = 500000; + + ret = rt9455_set_field_val(info, F_IAICR, + rt9455_iaicr_values, + ARRAY_SIZE(rt9455_iaicr_values), iaicr); + if (ret) { + dev_err(dev, "Failed to set IAICR value\n"); + return ret; + } + + /* + * Set IAICR_INT bit so that IAICR value is determined by IAICR bits + * and not by OTG pin. + */ + ret = regmap_field_write(info->regmap_fields[F_IAICR_INT], 0x01); + if (ret) { + dev_err(dev, "Failed to set IAICR_INT bit\n"); + return ret; + } + + /* + * Disable CHMIVRI interrupt. Because the driver sets MIVR value, + * CHMIVRI is triggered, but there is no action to be taken by the + * driver when CHMIVRI is triggered. + */ + ret = regmap_field_write(info->regmap_fields[F_CHMIVRIM], 0x01); + if (ret) { + dev_err(dev, "Failed to mask CHMIVRI interrupt\n"); + return ret; + } + + return 0; +} + +/* + * Before setting the charger into boost mode, boost output voltage is + * set. This is needed because boost output voltage may differ from battery + * regulation voltage. F_VOREG bits represent either battery regulation voltage + * or boost output voltage, depending on the mode the charger is. Both battery + * regulation voltage and boost output voltage are read from DT/ACPI during + * probe. + */ +static int rt9455_set_boost_voltage_before_boost_mode(struct rt9455_info *info) +{ + struct device *dev = &info->client->dev; + int ret; + + ret = rt9455_set_field_val(info, F_VOREG, + rt9455_boost_voltage_values, + ARRAY_SIZE(rt9455_boost_voltage_values), + info->boost_voltage); + if (ret) { + dev_err(dev, "Failed to set boost output voltage value\n"); + return ret; + } + + return 0; +} + +/* + * Before setting the charger into charge mode, battery regulation voltage is + * set. This is needed because boost output voltage may differ from battery + * regulation voltage. F_VOREG bits represent either battery regulation voltage + * or boost output voltage, depending on the mode the charger is. Both battery + * regulation voltage and boost output voltage are read from DT/ACPI during + * probe. + */ +static int rt9455_set_voreg_before_charge_mode(struct rt9455_info *info) +{ + struct device *dev = &info->client->dev; + int ret; + + ret = rt9455_set_field_val(info, F_VOREG, + rt9455_voreg_values, + ARRAY_SIZE(rt9455_voreg_values), + info->voreg); + if (ret) { + dev_err(dev, "Failed to set VOREG value\n"); + return ret; + } + + return 0; +} + +static int rt9455_irq_handler_check_irq1_register(struct rt9455_info *info, + bool *_is_battery_absent, + bool *_alert_userspace) +{ + unsigned int irq1, mask1, mask2; + struct device *dev = &info->client->dev; + bool is_battery_absent = false; + bool alert_userspace = false; + int ret; + + ret = regmap_read(info->regmap, RT9455_REG_IRQ1, &irq1); + if (ret) { + dev_err(dev, "Failed to read IRQ1 register\n"); + return ret; + } + + ret = regmap_read(info->regmap, RT9455_REG_MASK1, &mask1); + if (ret) { + dev_err(dev, "Failed to read MASK1 register\n"); + return ret; + } + + if (irq1 & GET_MASK(F_TSDI)) { + dev_err(dev, "Thermal shutdown fault occurred\n"); + alert_userspace = true; + } + + if (irq1 & GET_MASK(F_VINOVPI)) { + dev_err(dev, "Overvoltage input occurred\n"); + alert_userspace = true; + } + + if (irq1 & GET_MASK(F_BATAB)) { + dev_err(dev, "Battery absence occurred\n"); + is_battery_absent = true; + alert_userspace = true; + + if ((mask1 & GET_MASK(F_BATABM)) == 0) { + ret = regmap_field_write(info->regmap_fields[F_BATABM], + 0x01); + if (ret) { + dev_err(dev, "Failed to mask BATAB interrupt\n"); + return ret; + } + } + + ret = regmap_read(info->regmap, RT9455_REG_MASK2, &mask2); + if (ret) { + dev_err(dev, "Failed to read MASK2 register\n"); + return ret; + } + + if (mask2 & GET_MASK(F_CHTERMIM)) { + ret = regmap_field_write( + info->regmap_fields[F_CHTERMIM], 0x00); + if (ret) { + dev_err(dev, "Failed to unmask CHTERMI interrupt\n"); + return ret; + } + } + + if (mask2 & GET_MASK(F_CHRCHGIM)) { + ret = regmap_field_write( + info->regmap_fields[F_CHRCHGIM], 0x00); + if (ret) { + dev_err(dev, "Failed to unmask CHRCHGI interrupt\n"); + return ret; + } + } + + /* + * When the battery is absent, max_charging_time_work is + * cancelled, since no charging is done. + */ + cancel_delayed_work_sync(&info->max_charging_time_work); + /* + * Since no interrupt is triggered when the battery is + * reconnected, max_charging_time_work is not rescheduled. + * Therefore, batt_presence_work is scheduled to check whether + * the battery is still absent or not. + */ + queue_delayed_work(system_power_efficient_wq, + &info->batt_presence_work, + RT9455_BATT_PRESENCE_DELAY * HZ); + } + + *_is_battery_absent = is_battery_absent; + + if (alert_userspace) + *_alert_userspace = alert_userspace; + + return 0; +} + +static int rt9455_irq_handler_check_irq2_register(struct rt9455_info *info, + bool is_battery_absent, + bool *_alert_userspace) +{ + unsigned int irq2, mask2; + struct device *dev = &info->client->dev; + bool alert_userspace = false; + int ret; + + ret = regmap_read(info->regmap, RT9455_REG_IRQ2, &irq2); + if (ret) { + dev_err(dev, "Failed to read IRQ2 register\n"); + return ret; + } + + ret = regmap_read(info->regmap, RT9455_REG_MASK2, &mask2); + if (ret) { + dev_err(dev, "Failed to read MASK2 register\n"); + return ret; + } + + if (irq2 & GET_MASK(F_CHRVPI)) { + dev_dbg(dev, "Charger fault occurred\n"); + alert_userspace = true; + /* + * CHRVPI bit is set in 2 cases: + * 1. when the power source is connected to the charger. + * 2. when the power source is disconnected from the charger. + * To identify the case, PWR_RDY bit is checked. Because + * PWR_RDY bit is set / cleared after CHRVPI interrupt is + * triggered, it is used delayed_work to later read PWR_RDY bit. + */ + queue_delayed_work(system_power_efficient_wq, + &info->pwr_rdy_work, + RT9455_PWR_RDY_DELAY * HZ); + } + if (irq2 & GET_MASK(F_CHBATOVI)) { + dev_err(dev, "Battery OVP occurred\n"); + alert_userspace = true; + } + if (irq2 & GET_MASK(F_CHTERMI)) { + dev_dbg(dev, "Charge terminated\n"); + if (!is_battery_absent) { + if ((mask2 & GET_MASK(F_CHTERMIM)) == 0) { + ret = regmap_field_write( + info->regmap_fields[F_CHTERMIM], 0x01); + if (ret) { + dev_err(dev, "Failed to mask CHTERMI interrupt\n"); + return ret; + } + /* + * Update MASK2 value, since CHTERMIM bit is + * set. + */ + mask2 = mask2 | GET_MASK(F_CHTERMIM); + } + cancel_delayed_work_sync(&info->max_charging_time_work); + alert_userspace = true; + } + } + if (irq2 & GET_MASK(F_CHRCHGI)) { + dev_dbg(dev, "Recharge request\n"); + ret = regmap_field_write(info->regmap_fields[F_CHG_EN], + RT9455_CHARGE_ENABLE); + if (ret) { + dev_err(dev, "Failed to enable charging\n"); + return ret; + } + if (mask2 & GET_MASK(F_CHTERMIM)) { + ret = regmap_field_write( + info->regmap_fields[F_CHTERMIM], 0x00); + if (ret) { + dev_err(dev, "Failed to unmask CHTERMI interrupt\n"); + return ret; + } + /* Update MASK2 value, since CHTERMIM bit is cleared. */ + mask2 = mask2 & ~GET_MASK(F_CHTERMIM); + } + if (!is_battery_absent) { + /* + * No need to check whether the charger is connected to + * power source when CHRCHGI is received, since CHRCHGI + * is not triggered if the charger is not connected to + * the power source. + */ + queue_delayed_work(system_power_efficient_wq, + &info->max_charging_time_work, + RT9455_MAX_CHARGING_TIME * HZ); + alert_userspace = true; + } + } + if (irq2 & GET_MASK(F_CH32MI)) { + dev_err(dev, "Charger fault. 32 mins timeout occurred\n"); + alert_userspace = true; + } + if (irq2 & GET_MASK(F_CHTREGI)) { + dev_warn(dev, + "Charger warning. Thermal regulation loop active\n"); + alert_userspace = true; + } + if (irq2 & GET_MASK(F_CHMIVRI)) { + dev_dbg(dev, + "Charger warning. Input voltage MIVR loop active\n"); + } + + if (alert_userspace) + *_alert_userspace = alert_userspace; + + return 0; +} + +static int rt9455_irq_handler_check_irq3_register(struct rt9455_info *info, + bool *_alert_userspace) +{ + unsigned int irq3, mask3; + struct device *dev = &info->client->dev; + bool alert_userspace = false; + int ret; + + ret = regmap_read(info->regmap, RT9455_REG_IRQ3, &irq3); + if (ret) { + dev_err(dev, "Failed to read IRQ3 register\n"); + return ret; + } + + ret = regmap_read(info->regmap, RT9455_REG_MASK3, &mask3); + if (ret) { + dev_err(dev, "Failed to read MASK3 register\n"); + return ret; + } + + if (irq3 & GET_MASK(F_BSTBUSOVI)) { + dev_err(dev, "Boost fault. Overvoltage input occurred\n"); + alert_userspace = true; + } + if (irq3 & GET_MASK(F_BSTOLI)) { + dev_err(dev, "Boost fault. Overload\n"); + alert_userspace = true; + } + if (irq3 & GET_MASK(F_BSTLOWVI)) { + dev_err(dev, "Boost fault. Battery voltage too low\n"); + alert_userspace = true; + } + if (irq3 & GET_MASK(F_BST32SI)) { + dev_err(dev, "Boost fault. 32 seconds timeout occurred.\n"); + alert_userspace = true; + } + + if (alert_userspace) { + dev_info(dev, "Boost fault occurred, therefore the charger goes into charge mode\n"); + ret = rt9455_set_voreg_before_charge_mode(info); + if (ret) { + dev_err(dev, "Failed to set VOREG before entering charge mode\n"); + return ret; + } + ret = regmap_field_write(info->regmap_fields[F_OPA_MODE], + RT9455_CHARGE_MODE); + if (ret) { + dev_err(dev, "Failed to set charger in charge mode\n"); + return ret; + } + *_alert_userspace = alert_userspace; + } + + return 0; +} + +static irqreturn_t rt9455_irq_handler_thread(int irq, void *data) +{ + struct rt9455_info *info = data; + struct device *dev; + bool alert_userspace = false; + bool is_battery_absent = false; + unsigned int status; + int ret; + + if (!info) + return IRQ_NONE; + + dev = &info->client->dev; + + if (irq != info->client->irq) { + dev_err(dev, "Interrupt is not for RT9455 charger\n"); + return IRQ_NONE; + } + + ret = regmap_field_read(info->regmap_fields[F_STAT], &status); + if (ret) { + dev_err(dev, "Failed to read STAT bits\n"); + return IRQ_HANDLED; + } + dev_dbg(dev, "Charger status is %d\n", status); + + /* + * Each function that processes an IRQ register receives as output + * parameter alert_userspace pointer. alert_userspace is set to true + * in such a function only if an interrupt has occurred in the + * respective interrupt register. This way, it is avoided the following + * case: interrupt occurs only in IRQ1 register, + * rt9455_irq_handler_check_irq1_register() function sets to true + * alert_userspace, but rt9455_irq_handler_check_irq2_register() + * and rt9455_irq_handler_check_irq3_register() functions set to false + * alert_userspace and power_supply_changed() is never called. + */ + ret = rt9455_irq_handler_check_irq1_register(info, &is_battery_absent, + &alert_userspace); + if (ret) { + dev_err(dev, "Failed to handle IRQ1 register\n"); + return IRQ_HANDLED; + } + + ret = rt9455_irq_handler_check_irq2_register(info, is_battery_absent, + &alert_userspace); + if (ret) { + dev_err(dev, "Failed to handle IRQ2 register\n"); + return IRQ_HANDLED; + } + + ret = rt9455_irq_handler_check_irq3_register(info, &alert_userspace); + if (ret) { + dev_err(dev, "Failed to handle IRQ3 register\n"); + return IRQ_HANDLED; + } + + if (alert_userspace) { + /* + * Sometimes, an interrupt occurs while rt9455_probe() function + * is executing and power_supply_register() is not yet called. + * Do not call power_supply_charged() in this case. + */ + if (info->charger) + power_supply_changed(info->charger); + } + + return IRQ_HANDLED; +} + +static int rt9455_discover_charger(struct rt9455_info *info, u32 *ichrg, + u32 *ieoc_percentage, + u32 *mivr, u32 *iaicr) +{ + struct device *dev = &info->client->dev; + int ret; + + if (!dev->of_node && !ACPI_HANDLE(dev)) { + dev_err(dev, "No support for either device tree or ACPI\n"); + return -EINVAL; + } + /* + * ICHRG, IEOC_PERCENTAGE, VOREG and boost output voltage are mandatory + * parameters. + */ + ret = device_property_read_u32(dev, "richtek,output-charge-current", + ichrg); + if (ret) { + dev_err(dev, "Error: missing \"output-charge-current\" property\n"); + return ret; + } + + ret = device_property_read_u32(dev, "richtek,end-of-charge-percentage", + ieoc_percentage); + if (ret) { + dev_err(dev, "Error: missing \"end-of-charge-percentage\" property\n"); + return ret; + } + + ret = device_property_read_u32(dev, + "richtek,battery-regulation-voltage", + &info->voreg); + if (ret) { + dev_err(dev, "Error: missing \"battery-regulation-voltage\" property\n"); + return ret; + } + + ret = device_property_read_u32(dev, "richtek,boost-output-voltage", + &info->boost_voltage); + if (ret) { + dev_err(dev, "Error: missing \"boost-output-voltage\" property\n"); + return ret; + } + + /* + * MIVR and IAICR are optional parameters. Do not return error if one of + * them is not present in ACPI table or device tree specification. + */ + device_property_read_u32(dev, "richtek,min-input-voltage-regulation", + mivr); + device_property_read_u32(dev, "richtek,avg-input-current-regulation", + iaicr); + + return 0; +} + +static int rt9455_usb_event_none(struct rt9455_info *info, + u8 opa_mode, u8 iaicr) +{ + struct device *dev = &info->client->dev; + int ret; + + if (opa_mode == RT9455_BOOST_MODE) { + ret = rt9455_set_voreg_before_charge_mode(info); + if (ret) { + dev_err(dev, "Failed to set VOREG before entering charge mode\n"); + return ret; + } + /* + * If the charger is in boost mode, and it has received + * USB_EVENT_NONE, this means the consumer device powered by the + * charger is not connected anymore. + * In this case, the charger goes into charge mode. + */ + dev_dbg(dev, "USB_EVENT_NONE received, therefore the charger goes into charge mode\n"); + ret = regmap_field_write(info->regmap_fields[F_OPA_MODE], + RT9455_CHARGE_MODE); + if (ret) { + dev_err(dev, "Failed to set charger in charge mode\n"); + return NOTIFY_DONE; + } + } + + dev_dbg(dev, "USB_EVENT_NONE received, therefore IAICR is set to its minimum value\n"); + if (iaicr != RT9455_IAICR_100MA) { + ret = regmap_field_write(info->regmap_fields[F_IAICR], + RT9455_IAICR_100MA); + if (ret) { + dev_err(dev, "Failed to set IAICR value\n"); + return NOTIFY_DONE; + } + } + + return NOTIFY_OK; +} + +static int rt9455_usb_event_vbus(struct rt9455_info *info, + u8 opa_mode, u8 iaicr) +{ + struct device *dev = &info->client->dev; + int ret; + + if (opa_mode == RT9455_BOOST_MODE) { + ret = rt9455_set_voreg_before_charge_mode(info); + if (ret) { + dev_err(dev, "Failed to set VOREG before entering charge mode\n"); + return ret; + } + /* + * If the charger is in boost mode, and it has received + * USB_EVENT_VBUS, this means the consumer device powered by the + * charger is not connected anymore. + * In this case, the charger goes into charge mode. + */ + dev_dbg(dev, "USB_EVENT_VBUS received, therefore the charger goes into charge mode\n"); + ret = regmap_field_write(info->regmap_fields[F_OPA_MODE], + RT9455_CHARGE_MODE); + if (ret) { + dev_err(dev, "Failed to set charger in charge mode\n"); + return NOTIFY_DONE; + } + } + + dev_dbg(dev, "USB_EVENT_VBUS received, therefore IAICR is set to 500 mA\n"); + if (iaicr != RT9455_IAICR_500MA) { + ret = regmap_field_write(info->regmap_fields[F_IAICR], + RT9455_IAICR_500MA); + if (ret) { + dev_err(dev, "Failed to set IAICR value\n"); + return NOTIFY_DONE; + } + } + + return NOTIFY_OK; +} + +static int rt9455_usb_event_id(struct rt9455_info *info, + u8 opa_mode, u8 iaicr) +{ + struct device *dev = &info->client->dev; + int ret; + + if (opa_mode == RT9455_CHARGE_MODE) { + ret = rt9455_set_boost_voltage_before_boost_mode(info); + if (ret) { + dev_err(dev, "Failed to set boost output voltage before entering boost mode\n"); + return ret; + } + /* + * If the charger is in charge mode, and it has received + * USB_EVENT_ID, this means a consumer device is connected and + * it should be powered by the charger. + * In this case, the charger goes into boost mode. + */ + dev_dbg(dev, "USB_EVENT_ID received, therefore the charger goes into boost mode\n"); + ret = regmap_field_write(info->regmap_fields[F_OPA_MODE], + RT9455_BOOST_MODE); + if (ret) { + dev_err(dev, "Failed to set charger in boost mode\n"); + return NOTIFY_DONE; + } + } + + dev_dbg(dev, "USB_EVENT_ID received, therefore IAICR is set to its minimum value\n"); + if (iaicr != RT9455_IAICR_100MA) { + ret = regmap_field_write(info->regmap_fields[F_IAICR], + RT9455_IAICR_100MA); + if (ret) { + dev_err(dev, "Failed to set IAICR value\n"); + return NOTIFY_DONE; + } + } + + return NOTIFY_OK; +} + +static int rt9455_usb_event_charger(struct rt9455_info *info, + u8 opa_mode, u8 iaicr) +{ + struct device *dev = &info->client->dev; + int ret; + + if (opa_mode == RT9455_BOOST_MODE) { + ret = rt9455_set_voreg_before_charge_mode(info); + if (ret) { + dev_err(dev, "Failed to set VOREG before entering charge mode\n"); + return ret; + } + /* + * If the charger is in boost mode, and it has received + * USB_EVENT_CHARGER, this means the consumer device powered by + * the charger is not connected anymore. + * In this case, the charger goes into charge mode. + */ + dev_dbg(dev, "USB_EVENT_CHARGER received, therefore the charger goes into charge mode\n"); + ret = regmap_field_write(info->regmap_fields[F_OPA_MODE], + RT9455_CHARGE_MODE); + if (ret) { + dev_err(dev, "Failed to set charger in charge mode\n"); + return NOTIFY_DONE; + } + } + + dev_dbg(dev, "USB_EVENT_CHARGER received, therefore IAICR is set to no current limit\n"); + if (iaicr != RT9455_IAICR_NO_LIMIT) { + ret = regmap_field_write(info->regmap_fields[F_IAICR], + RT9455_IAICR_NO_LIMIT); + if (ret) { + dev_err(dev, "Failed to set IAICR value\n"); + return NOTIFY_DONE; + } + } + + return NOTIFY_OK; +} + +static int rt9455_usb_event(struct notifier_block *nb, + unsigned long event, void *power) +{ + struct rt9455_info *info = container_of(nb, struct rt9455_info, nb); + struct device *dev = &info->client->dev; + unsigned int opa_mode, iaicr; + int ret; + + if (!info) + return NOTIFY_DONE; + + /* + * Determine whether the charger is in charge mode + * or in boost mode. + */ + ret = regmap_field_read(info->regmap_fields[F_OPA_MODE], + &opa_mode); + if (ret) { + dev_err(dev, "Failed to read OPA_MODE value\n"); + return NOTIFY_DONE; + } + + ret = regmap_field_read(info->regmap_fields[F_IAICR], + &iaicr); + if (ret) { + dev_err(dev, "Failed to read IAICR value\n"); + return NOTIFY_DONE; + } + + dev_dbg(dev, "Received USB event %lu\n", event); + switch (event) { + case USB_EVENT_NONE: + return rt9455_usb_event_none(info, opa_mode, iaicr); + case USB_EVENT_VBUS: + return rt9455_usb_event_vbus(info, opa_mode, iaicr); + case USB_EVENT_ID: + return rt9455_usb_event_id(info, opa_mode, iaicr); + case USB_EVENT_CHARGER: + return rt9455_usb_event_charger(info, opa_mode, iaicr); + default: + dev_err(dev, "Unknown USB event\n"); + } + return NOTIFY_DONE; +} + +static void rt9455_pwr_rdy_work_callback(struct work_struct *work) +{ + struct rt9455_info *info = container_of(work, struct rt9455_info, + pwr_rdy_work.work); + struct device *dev = &info->client->dev; + unsigned int pwr_rdy; + int ret; + + ret = regmap_field_read(info->regmap_fields[F_PWR_RDY], &pwr_rdy); + if (ret) { + dev_err(dev, "Failed to read PWR_RDY bit\n"); + return; + } + switch (pwr_rdy) { + case RT9455_PWR_FAULT: + dev_dbg(dev, "Charger disconnected from power source\n"); + cancel_delayed_work_sync(&info->max_charging_time_work); + break; + case RT9455_PWR_GOOD: + dev_dbg(dev, "Charger connected to power source\n"); + ret = regmap_field_write(info->regmap_fields[F_CHG_EN], + RT9455_CHARGE_ENABLE); + if (ret) { + dev_err(dev, "Failed to enable charging\n"); + return; + } + queue_delayed_work(system_power_efficient_wq, + &info->max_charging_time_work, + RT9455_MAX_CHARGING_TIME * HZ); + break; + } +} + +static void rt9455_max_charging_time_work_callback(struct work_struct *work) +{ + struct rt9455_info *info = container_of(work, struct rt9455_info, + max_charging_time_work.work); + struct device *dev = &info->client->dev; + int ret; + + dev_err(dev, "Battery has been charging for at least 6 hours and is not yet fully charged. Battery is dead, therefore charging is disabled.\n"); + ret = regmap_field_write(info->regmap_fields[F_CHG_EN], + RT9455_CHARGE_DISABLE); + if (ret) + dev_err(dev, "Failed to disable charging\n"); +} + +static void rt9455_batt_presence_work_callback(struct work_struct *work) +{ + struct rt9455_info *info = container_of(work, struct rt9455_info, + batt_presence_work.work); + struct device *dev = &info->client->dev; + unsigned int irq1, mask1; + int ret; + + ret = regmap_read(info->regmap, RT9455_REG_IRQ1, &irq1); + if (ret) { + dev_err(dev, "Failed to read IRQ1 register\n"); + return; + } + + /* + * If the battery is still absent, batt_presence_work is rescheduled. + * Otherwise, max_charging_time is scheduled. + */ + if (irq1 & GET_MASK(F_BATAB)) { + queue_delayed_work(system_power_efficient_wq, + &info->batt_presence_work, + RT9455_BATT_PRESENCE_DELAY * HZ); + } else { + queue_delayed_work(system_power_efficient_wq, + &info->max_charging_time_work, + RT9455_MAX_CHARGING_TIME * HZ); + + ret = regmap_read(info->regmap, RT9455_REG_MASK1, &mask1); + if (ret) { + dev_err(dev, "Failed to read MASK1 register\n"); + return; + } + + if (mask1 & GET_MASK(F_BATABM)) { + ret = regmap_field_write(info->regmap_fields[F_BATABM], + 0x00); + if (ret) + dev_err(dev, "Failed to unmask BATAB interrupt\n"); + } + } +} + +static const struct power_supply_desc rt9455_charger_desc = { + .name = RT9455_DRIVER_NAME, + .type = POWER_SUPPLY_TYPE_USB, + .properties = rt9455_charger_properties, + .num_properties = ARRAY_SIZE(rt9455_charger_properties), + .get_property = rt9455_charger_get_property, +}; + +static bool rt9455_is_writeable_reg(struct device *dev, unsigned int reg) +{ + switch (reg) { + case RT9455_REG_DEV_ID: + case RT9455_REG_IRQ1: + case RT9455_REG_IRQ2: + case RT9455_REG_IRQ3: + return false; + default: + return true; + } +} + +static bool rt9455_is_volatile_reg(struct device *dev, unsigned int reg) +{ + switch (reg) { + case RT9455_REG_DEV_ID: + case RT9455_REG_CTRL5: + case RT9455_REG_CTRL6: + return false; + default: + return true; + } +} + +static const struct regmap_config rt9455_regmap_config = { + .reg_bits = 8, + .val_bits = 8, + .writeable_reg = rt9455_is_writeable_reg, + .volatile_reg = rt9455_is_volatile_reg, + .max_register = RT9455_REG_MASK3, + .cache_type = REGCACHE_RBTREE, +}; + +static int rt9455_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent); + struct device *dev = &client->dev; + struct rt9455_info *info; + struct power_supply_config rt9455_charger_config = {}; + /* + * Mandatory device-specific data values. Also, VOREG and boost output + * voltage are mandatory values, but they are stored in rt9455_info + * structure. + */ + u32 ichrg, ieoc_percentage; + /* Optional device-specific data values. */ + u32 mivr = -1, iaicr = -1; + int i, ret; + + if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) { + dev_err(dev, "No support for SMBUS_BYTE_DATA\n"); + return -ENODEV; + } + info = devm_kzalloc(dev, sizeof(*info), GFP_KERNEL); + if (!info) + return -ENOMEM; + + info->client = client; + i2c_set_clientdata(client, info); + + info->regmap = devm_regmap_init_i2c(client, + &rt9455_regmap_config); + if (IS_ERR(info->regmap)) { + dev_err(dev, "Failed to initialize register map\n"); + return -EINVAL; + } + + for (i = 0; i < F_MAX_FIELDS; i++) { + info->regmap_fields[i] = + devm_regmap_field_alloc(dev, info->regmap, + rt9455_reg_fields[i]); + if (IS_ERR(info->regmap_fields[i])) { + dev_err(dev, + "Failed to allocate regmap field = %d\n", i); + return PTR_ERR(info->regmap_fields[i]); + } + } + + ret = rt9455_discover_charger(info, &ichrg, &ieoc_percentage, + &mivr, &iaicr); + if (ret) { + dev_err(dev, "Failed to discover charger\n"); + return ret; + } + +#if IS_ENABLED(CONFIG_USB_PHY) + info->usb_phy = devm_usb_get_phy(dev, USB_PHY_TYPE_USB2); + if (IS_ERR(info->usb_phy)) { + dev_err(dev, "Failed to get USB transceiver\n"); + } else { + info->nb.notifier_call = rt9455_usb_event; + ret = usb_register_notifier(info->usb_phy, &info->nb); + if (ret) { + dev_err(dev, "Failed to register USB notifier\n"); + /* + * If usb_register_notifier() fails, set notifier_call + * to NULL, to avoid calling usb_unregister_notifier(). + */ + info->nb.notifier_call = NULL; + } + } +#endif + + INIT_DEFERRABLE_WORK(&info->pwr_rdy_work, rt9455_pwr_rdy_work_callback); + INIT_DEFERRABLE_WORK(&info->max_charging_time_work, + rt9455_max_charging_time_work_callback); + INIT_DEFERRABLE_WORK(&info->batt_presence_work, + rt9455_batt_presence_work_callback); + + rt9455_charger_config.of_node = dev->of_node; + rt9455_charger_config.drv_data = info; + rt9455_charger_config.supplied_to = rt9455_charger_supplied_to; + rt9455_charger_config.num_supplicants = + ARRAY_SIZE(rt9455_charger_supplied_to); + ret = devm_request_threaded_irq(dev, client->irq, NULL, + rt9455_irq_handler_thread, + IRQF_TRIGGER_LOW | IRQF_ONESHOT, + RT9455_DRIVER_NAME, info); + if (ret) { + dev_err(dev, "Failed to register IRQ handler\n"); + goto put_usb_notifier; + } + + ret = rt9455_hw_init(info, ichrg, ieoc_percentage, mivr, iaicr); + if (ret) { + dev_err(dev, "Failed to set charger to its default values\n"); + goto put_usb_notifier; + } + + info->charger = devm_power_supply_register(dev, &rt9455_charger_desc, + &rt9455_charger_config); + if (IS_ERR(info->charger)) { + dev_err(dev, "Failed to register charger\n"); + ret = PTR_ERR(info->charger); + goto put_usb_notifier; + } + + return 0; + +put_usb_notifier: +#if IS_ENABLED(CONFIG_USB_PHY) + if (info->nb.notifier_call) { + usb_unregister_notifier(info->usb_phy, &info->nb); + info->nb.notifier_call = NULL; + } +#endif + return ret; +} + +static int rt9455_remove(struct i2c_client *client) +{ + int ret; + struct rt9455_info *info = i2c_get_clientdata(client); + + ret = rt9455_register_reset(info); + if (ret) + dev_err(&info->client->dev, "Failed to set charger to its default values\n"); + +#if IS_ENABLED(CONFIG_USB_PHY) + if (info->nb.notifier_call) + usb_unregister_notifier(info->usb_phy, &info->nb); +#endif + + cancel_delayed_work_sync(&info->pwr_rdy_work); + cancel_delayed_work_sync(&info->max_charging_time_work); + cancel_delayed_work_sync(&info->batt_presence_work); + + return ret; +} + +static const struct i2c_device_id rt9455_i2c_id_table[] = { + { RT9455_DRIVER_NAME, 0 }, + { }, +}; +MODULE_DEVICE_TABLE(i2c, rt9455_i2c_id_table); + +static const struct of_device_id rt9455_of_match[] = { + { .compatible = "richtek,rt9455", }, + { }, +}; +MODULE_DEVICE_TABLE(of, rt9455_of_match); + +static const struct acpi_device_id rt9455_i2c_acpi_match[] = { + { "RT945500", 0 }, + { } +}; +MODULE_DEVICE_TABLE(acpi, rt9455_i2c_acpi_match); + +static struct i2c_driver rt9455_driver = { + .probe = rt9455_probe, + .remove = rt9455_remove, + .id_table = rt9455_i2c_id_table, + .driver = { + .name = RT9455_DRIVER_NAME, + .of_match_table = of_match_ptr(rt9455_of_match), + .acpi_match_table = ACPI_PTR(rt9455_i2c_acpi_match), + }, +}; +module_i2c_driver(rt9455_driver); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Anda-Maria Nicolae <anda-maria.nicolae@intel.com>"); +MODULE_ALIAS("i2c:rt9455-charger"); +MODULE_DESCRIPTION("Richtek RT9455 Charger Driver"); |
