From: Chris Morgan <macromorgan@xxxxxxxxxxx> Add support for the charger function of the BQ257XX. The device is capable of charging batteries with a layout of 1 to 4 cells in series. Signed-off-by: Chris Morgan <macromorgan@xxxxxxxxxxx> --- drivers/power/supply/Kconfig | 7 + drivers/power/supply/Makefile | 1 + drivers/power/supply/bq257xx_charger.c | 811 +++++++++++++++++++++++++ 3 files changed, 819 insertions(+) create mode 100644 drivers/power/supply/bq257xx_charger.c diff --git a/drivers/power/supply/Kconfig b/drivers/power/supply/Kconfig index bcfa63fb9f1e..9c5327245264 100644 --- a/drivers/power/supply/Kconfig +++ b/drivers/power/supply/Kconfig @@ -720,6 +720,13 @@ config CHARGER_BQ2515X rail, ADC for battery and system monitoring, and push-button controller. +config CHARGER_BQ257XX + tristate "TI BQ257XX battery charger family" + depends on MFD_BQ257XX + help + Say Y to enable support for the TI BQ257XX family of battery + charging integrated circuits. + config CHARGER_BQ25890 tristate "TI BQ25890 battery charger driver" depends on I2C diff --git a/drivers/power/supply/Makefile b/drivers/power/supply/Makefile index 8dcb41545317..7652e9575f75 100644 --- a/drivers/power/supply/Makefile +++ b/drivers/power/supply/Makefile @@ -93,6 +93,7 @@ obj-$(CONFIG_CHARGER_BQ24190) += bq24190_charger.o obj-$(CONFIG_CHARGER_BQ24257) += bq24257_charger.o obj-$(CONFIG_CHARGER_BQ24735) += bq24735-charger.o obj-$(CONFIG_CHARGER_BQ2515X) += bq2515x_charger.o +obj-$(CONFIG_CHARGER_BQ257XX) += bq257xx_charger.o obj-$(CONFIG_CHARGER_BQ25890) += bq25890_charger.o obj-$(CONFIG_CHARGER_BQ25980) += bq25980_charger.o obj-$(CONFIG_CHARGER_BQ256XX) += bq256xx_charger.o diff --git a/drivers/power/supply/bq257xx_charger.c b/drivers/power/supply/bq257xx_charger.c new file mode 100644 index 000000000000..58dcb8583897 --- /dev/null +++ b/drivers/power/supply/bq257xx_charger.c @@ -0,0 +1,811 @@ +// SPDX-License-Identifier: GPL-2.0 +/* BQ257XX Battery Charger Driver + * Copyright (C) 2024 Chris Morgan <macromorgan@xxxxxxxxxxx> + * Based off of BQ256XX Battery Charger Driver + * Copyright (C) 2020 Texas Instruments Incorporated - http://www.ti.com/ + */ + +#include <linux/bitfield.h> +#include <linux/i2c.h> +#include <linux/mfd/bq257xx.h> +#include <linux/moduleparam.h> +#include <linux/platform_device.h> +#include <linux/power_supply.h> +#include <linux/regmap.h> + +/* Forward declaration of driver data. */ +struct bq257xx_chg; + +/** + * struct bq257xx_chip_info - chip specific routines + * @bq257xx_hw_init: init function for hw + * @bq257xx_hw_shutdown: shutdown function for hw + * @bq257xx_get_state: get and update state of hardware + * @bq257xx_set_ichg: set maximum charge current (in uA) + * @bq257xx_set_vbatreg: set maximum charge voltage (in uV) + * @bq257xx_set_iindpm: set maximum input current (in uA) + * + * Functions for variants of the BQ257XX IC revisions that are made + * available generic portions of the driver code (such as the main + * probe function). + */ +struct bq257xx_chip_info { + int (*bq257xx_hw_init)(struct bq257xx_chg *pdata); + void (*bq257xx_hw_shutdown)(struct bq257xx_chg *pdata); + int (*bq257xx_get_state)(struct bq257xx_chg *pdata); + int (*bq257xx_set_ichg)(struct bq257xx_chg *pdata, int ichg); + int (*bq257xx_set_vbatreg)(struct bq257xx_chg *pdata, int vbatreg); + int (*bq257xx_set_iindpm)(struct bq257xx_chg *pdata, int iindpm); +}; + +/** + * struct bq257xx_chg - driver data for charger + * @bq257xx_chip_info: hw specific functions + * @bq257xx_device: parent MFD device + * @charger: power supply device + * @online: charger input is present + * @fast_charge: charger is in fast charge mode + * @pre_charge: charger is in pre-charge mode + * @ov_fault: charger reports over voltage fault + * @batoc_fault: charger reports battery over current fault + * @oc_fault: charger reports over current fault + * @usb_type: USB type reported from parent power supply + * @supplied: Status of parent power supply + * @iindpm_max: maximum input current limit (uA) + * @vbat_max: maximum charge voltage (uV) + * @ichg_max: maximum charge current (uA) + * @vsys_min: minimum system voltage (uV) + */ +struct bq257xx_chg { + const struct bq257xx_chip_info *chip; + struct bq257xx_device *bq; + struct power_supply *charger; + bool online; + bool fast_charge; + bool pre_charge; + bool ov_fault; + bool batoc_fault; + bool oc_fault; + int usb_type; + int supplied; + u32 iindpm_max; + u32 vbat_max; + u32 ichg_max; + u32 vsys_min; +}; + +/** + * bq25703_get_state() - Get the current state of the device + * @pdata: driver platform data + * + * Get the current state of the charger. Check if the charger is + * powered, what kind of charge state (if any) the device is in, + * and if there are any active faults. + * + * Return: Returns 0 on success, or error on failure to read device. + */ +static int bq25703_get_state(struct bq257xx_chg *pdata) +{ + unsigned int reg; + int ret; + + ret = regmap_read(pdata->bq->regmap, BQ25703_CHARGER_STATUS, ®); + if (ret) + return ret; + + pdata->online = reg & BQ25703_STS_AC_STAT; + pdata->fast_charge = reg & BQ25703_STS_IN_FCHRG; + pdata->pre_charge = reg & BQ25703_STS_IN_PCHRG; + pdata->ov_fault = reg & BQ25703_STS_FAULT_ACOV; + pdata->batoc_fault = reg & BQ25703_STS_FAULT_BATOC; + pdata->oc_fault = reg & BQ25703_STS_FAULT_ACOC; + + return 0; +} + +/** + * bq25703_get_min_vsys() - Get the minimum system voltage + * @pdata: driver platform data + * + * Return: Returns minimum system voltage in uV on success, or error on + * failure to read device. + */ +static int bq25703_get_min_vsys(struct bq257xx_chg *pdata) +{ + unsigned int reg; + int ret; + + ret = regmap_read(pdata->bq->regmap, BQ25703_MIN_VSYS, + ®); + if (ret) + return ret; + + reg = FIELD_GET(BQ25703_MINVSYS_MASK, reg); + return (reg * BQ25703_MINVSYS_STEP_UV) + BQ25703_MINVSYS_MIN_UV; +} + +/** + * bq25703_set_min_vsys() - Set the minimum system voltage + * @pdata: driver platform data + * @ichg: voltage value to set in uV. + * + * This function takes a requested minimum system voltage value, clamps + * it between the minimum supported value by the charger and a user + * defined minimum system value, and then writes the value to the + * appropriate register. + * + * Return: Returns 0 on success or error if an error occurs. + */ +static int bq25703_set_min_vsys(struct bq257xx_chg *pdata, int vsys) +{ + unsigned int reg; + int vsys_min = pdata->vsys_min; + + vsys = clamp(vsys, BQ25703_MINVSYS_MIN_UV, vsys_min); + reg = ((vsys - BQ25703_MINVSYS_MIN_UV) / BQ25703_MINVSYS_STEP_UV); + reg = FIELD_PREP(BQ25703_MINVSYS_MASK, reg); + + return regmap_write(pdata->bq->regmap, BQ25703_MIN_VSYS, + reg); +} + +/** + * bq25703_get_cur() - Get the reported current from the battery + * @pdata: driver platform data + * + * Return: Returns reported current from battery in uA as an absolute + * value (charge and discharge are both positive integers). + * Returns error if unable to read register value. + */ +static int bq25703_get_cur(struct bq257xx_chg *pdata) +{ + unsigned int reg; + int ret; + + ret = regmap_read(pdata->bq->regmap, BQ25703_ADCIBAT_CHG, ®); + if (ret < 0) + return ret; + + if (pdata->online) + return FIELD_GET(BQ25703_ADCIBAT_CHG_MASK, reg) * + BQ25703_ADCIBAT_CHG_STEP_UA; + else + return FIELD_GET(BQ25703_ADCIBAT_DISCHG_MASK, reg) * + BQ25703_ADCIBAT_DIS_STEP_UA; +} + +/** + * bq25703_get_ichg_cur() - Get the maximum reported charge current + * @pdata: driver platform data + * + * Return: Returns maximum set charge current from charger in uA. + * Returns error if unable to read register value. + */ +static int bq25703_get_ichg_cur(struct bq257xx_chg *pdata) +{ + unsigned int reg; + int ret; + + ret = regmap_read(pdata->bq->regmap, BQ25703_CHARGE_CURRENT, ®); + if (ret) + return ret; + + return FIELD_GET(BQ25703_ICHG_MASK, reg) * BQ25703_ICHG_STEP_UA; +} + +/** + * bq25703_set_ichg_cur() - Set the maximum charge current + * @pdata: driver platform data + * @ichg: current value to set in uA. + * + * This function takes a requested maximum charge current value, clamps + * it between the minimum supported value by the charger and a user + * defined maximum charging value, and then writes the value to the + * appropriate register. + * + * Return: Returns 0 on success or error if an error occurs. + */ +static int bq25703_set_ichg_cur(struct bq257xx_chg *pdata, int ichg) +{ + unsigned int reg; + int ichg_max = pdata->ichg_max; + + ichg = clamp(ichg, BQ25703_ICHG_MIN_UA, ichg_max); + reg = FIELD_PREP(BQ25703_ICHG_MASK, (ichg / BQ25703_ICHG_STEP_UA)); + + return regmap_write(pdata->bq->regmap, BQ25703_CHARGE_CURRENT, + reg); +} + +/** + * bq25703_get_chrg_volt() - Get the maximum set charge voltage + * @pdata: driver platform data + * + * Return: Returns maximum set charge voltage from charger in uV. + * Returns error if unable to read register value. + */ +static int bq25703_get_chrg_volt(struct bq257xx_chg *pdata) +{ + unsigned int reg; + int ret; + + ret = regmap_read(pdata->bq->regmap, BQ25703_MAX_CHARGE_VOLT, + ®); + if (ret) + return ret; + + return FIELD_GET(BQ25703_MAX_CHARGE_VOLT_MASK, reg) * + BQ25703_VBATREG_STEP_UV; +} + +/** + * bq25703_set_chrg_volt() - Set the maximum charge voltage + * @pdata: driver platform data + * @vbat: voltage value to set in uV. + * + * This function takes a requested maximum charge voltage value, clamps + * it between the minimum supported value by the charger and a user + * defined maximum charging value, and then writes the value to the + * appropriate register. + * + * Return: Returns 0 on success or error if an error occurs. + */ +static int bq25703_set_chrg_volt(struct bq257xx_chg *pdata, int vbat) +{ + unsigned int reg; + int vbat_max = pdata->vbat_max; + + vbat = clamp(vbat, BQ25703_VBATREG_MIN_UV, vbat_max); + + reg = FIELD_PREP(BQ25703_MAX_CHARGE_VOLT_MASK, + (vbat / BQ25703_VBATREG_STEP_UV)); + + return regmap_write(pdata->bq->regmap, BQ25703_MAX_CHARGE_VOLT, + reg); +} + +/** + * bq25703_get_iindpm() - Get the maximum set input current + * @pdata: driver platform data + * + * Read the actual input current limit from the device. This can differ + * from the value programmed due to some autonomous functions that may + * be enabled (but are not currently). This is why there is a different + * register used. + * + * Return: Returns maximum set input current from charger in uA. + * Returns error if unable to read register value. + */ +static int bq25703_get_iindpm(struct bq257xx_chg *pdata) +{ + unsigned int reg; + int ret; + + ret = regmap_read(pdata->bq->regmap, BQ25703_IIN_DPM, ®); + if (ret) + return ret; + + reg = FIELD_GET(BQ25703_IINDPM_MASK, reg); + return (reg * BQ25703_IINDPM_STEP_UA) + BQ25703_IINDPM_OFFSET_UA; +} + +/** + * bq25703_set_iindpm() - Set the maximum input current + * @pdata: driver platform data + * @iindpm: current value in uA. + * + * This function takes a requested maximum input current value, clamps + * it between the minimum supported value by the charger and a user + * defined maximum input value, and then writes the value to the + * appropriate register. + * + * Return: Returns 0 on success or error if an error occurs. + */ +static int bq25703_set_iindpm(struct bq257xx_chg *pdata, int iindpm) +{ + unsigned int reg; + int iindpm_max = pdata->iindpm_max; + + iindpm = clamp(iindpm, BQ25703_IINDPM_MIN_UA, iindpm_max); + + reg = ((iindpm - BQ25703_IINDPM_OFFSET_UA) / BQ25703_IINDPM_STEP_UA); + + return regmap_write(pdata->bq->regmap, BQ25703_IIN_HOST, + FIELD_PREP(BQ25703_IINDPM_MASK, reg)); +} + +/** + * bq25703_get_vbat() - Get the reported voltage from the battery + * @pdata: driver platform data + * + * Return: Returns reported voltage from battery in uV. + * Returns error if unable to read register value. + */ +static int bq25703_get_vbat(struct bq257xx_chg *pdata) +{ + unsigned int reg; + int ret; + + ret = regmap_read(pdata->bq->regmap, BQ25703_ADCVSYSVBAT, ®); + if (ret) + return ret; + + reg = FIELD_GET(BQ25703_ADCVBAT_MASK, reg); + + return (reg * BQ25703_ADCVSYSVBAT_STEP) + BQ25703_ADCVSYSVBAT_OFFSET_UV; + +} + +/** + * bq25703_hw_init() - Set all the required registers to init the charger + * @pdata: driver platform data + * + * Initialize the BQ25703 by first disabling the watchdog timer (which + * shuts off the charger in the absence of periodic writes). Then, set + * the charge current, charge voltage, minimum system voltage, and + * input current limit. Disable low power mode to allow ADCs and + * interrupts. Enable the ADC, start the ADC, set the ADC scale to + * full, and enable each individual ADC channel. + * + * Return: Returns 0 on success or error code on error. + */ +static int bq25703_hw_init(struct bq257xx_chg *pdata) +{ + int ret = 0; + + regmap_update_bits(pdata->bq->regmap, BQ25703_CHARGE_OPTION_0, + BQ25703_WDTMR_ADJ_MASK, + FIELD_PREP(BQ25703_WDTMR_ADJ_MASK, + BQ25703_WDTMR_DISABLE)); + + ret = pdata->chip->bq257xx_set_ichg(pdata, pdata->ichg_max); + if (ret) + return ret; + + ret = pdata->chip->bq257xx_set_vbatreg(pdata, pdata->vbat_max); + if (ret) + return ret; + + ret = bq25703_set_min_vsys(pdata, pdata->vsys_min); + if (ret) + return ret; + + ret = pdata->chip->bq257xx_set_iindpm(pdata, pdata->iindpm_max); + if (ret) + return ret; + + regmap_update_bits(pdata->bq->regmap, BQ25703_CHARGE_OPTION_0, + BQ25703_EN_LWPWR, !BQ25703_EN_LWPWR); + + regmap_update_bits(pdata->bq->regmap, BQ25703_ADC_OPTION, + BQ25703_ADC_CONV_EN, BQ25703_ADC_CONV_EN); + + regmap_update_bits(pdata->bq->regmap, BQ25703_ADC_OPTION, + BQ25703_ADC_START, BQ25703_ADC_START); + + regmap_update_bits(pdata->bq->regmap, BQ25703_ADC_OPTION, + BQ25703_ADC_FULL_SCALE, BQ25703_ADC_FULL_SCALE); + + regmap_update_bits(pdata->bq->regmap, BQ25703_ADC_OPTION, + BQ25703_ADC_CH_MASK, + (BQ25703_ADC_CMPIN_EN | BQ25703_ADC_VBUS_EN | + BQ25703_ADC_PSYS_EN | BQ25703_ADC_IIN_EN | + BQ25703_ADC_IDCHG_EN | BQ25703_ADC_ICHG_EN | + BQ25703_ADC_VSYS_EN | BQ25703_ADC_VBAT_EN)); + + return ret; +} + +/** + * bq25703_hw_shutdown() - Set registers for shutdown + * @pdata: driver platform data + * + * Enable low power mode for the device while in shutdown. + */ +static void bq25703_hw_shutdown(struct bq257xx_chg *pdata) +{ + regmap_update_bits(pdata->bq->regmap, BQ25703_CHARGE_OPTION_0, + BQ25703_EN_LWPWR, BQ25703_EN_LWPWR); +} + +static int bq257xx_set_charger_property(struct power_supply *psy, + enum power_supply_property prop, + const union power_supply_propval *val) +{ + struct bq257xx_chg *pdata = power_supply_get_drvdata(psy); + int ret = -EINVAL; + + switch (prop) { + case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT: + ret = pdata->chip->bq257xx_set_iindpm(pdata, val->intval); + if (ret) + return ret; + break; + + case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX: + ret = pdata->chip->bq257xx_set_vbatreg(pdata, val->intval); + if (ret) + return ret; + break; + + case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX: + ret = pdata->chip->bq257xx_set_ichg(pdata, val->intval); + if (ret) + return ret; + break; + + default: + break; + } + + return ret; +} + +static int bq257xx_get_charger_property(struct power_supply *psy, + enum power_supply_property psp, + union power_supply_propval *val) +{ + struct bq257xx_chg *pdata = power_supply_get_drvdata(psy); + int ret = 0; + + ret = pdata->chip->bq257xx_get_state(pdata); + if (ret) + return ret; + + switch (psp) { + case POWER_SUPPLY_PROP_STATUS: + if (!pdata->online) + val->intval = POWER_SUPPLY_STATUS_DISCHARGING; + else if (!bq25703_get_cur(pdata)) + val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING; + else if (pdata->fast_charge || pdata->pre_charge) + val->intval = POWER_SUPPLY_STATUS_CHARGING; + else + val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING; + break; + + case POWER_SUPPLY_PROP_HEALTH: + if (pdata->ov_fault || pdata->batoc_fault) + val->intval = POWER_SUPPLY_HEALTH_OVERVOLTAGE; + else if (pdata->oc_fault) + val->intval = POWER_SUPPLY_HEALTH_OVERCURRENT; + else + val->intval = POWER_SUPPLY_HEALTH_GOOD; + break; + + case POWER_SUPPLY_PROP_MANUFACTURER: + val->strval = BQ257XX_MANUFACTURER; + break; + + case POWER_SUPPLY_PROP_ONLINE: + val->intval = pdata->online; + break; + + case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT: + ret = bq25703_get_iindpm(pdata); + if (ret < 0) + return ret; + val->intval = ret; + break; + + case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX: + ret = bq25703_get_chrg_volt(pdata); + if (ret < 0) + return ret; + val->intval = ret; + break; + + case POWER_SUPPLY_PROP_CURRENT_NOW: + ret = bq25703_get_cur(pdata); + if (ret < 0) + return ret; + + if (pdata->online) + val->intval = ret; + else + val->intval = -ret; + break; + + case POWER_SUPPLY_PROP_VOLTAGE_NOW: + ret = bq25703_get_vbat(pdata); + if (ret < 0) + return ret; + val->intval = ret; + break; + + case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX: + ret = bq25703_get_ichg_cur(pdata); + if (ret < 0) + return ret; + val->intval = ret; + break; + + case POWER_SUPPLY_PROP_VOLTAGE_MIN: + ret = bq25703_get_min_vsys(pdata); + if (ret < 0) + return ret; + val->intval = ret; + break; + + case POWER_SUPPLY_PROP_USB_TYPE: + val->intval = pdata->usb_type; + break; + + default: + return -EINVAL; + } + + return ret; +} + +static enum power_supply_property bq257xx_power_supply_props[] = { + POWER_SUPPLY_PROP_MANUFACTURER, + POWER_SUPPLY_PROP_STATUS, + POWER_SUPPLY_PROP_ONLINE, + POWER_SUPPLY_PROP_HEALTH, + POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT, + POWER_SUPPLY_PROP_CURRENT_NOW, + POWER_SUPPLY_PROP_VOLTAGE_NOW, + POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX, + POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX, + POWER_SUPPLY_PROP_VOLTAGE_MIN, + POWER_SUPPLY_PROP_USB_TYPE, +}; + +static int bq257xx_property_is_writeable(struct power_supply *psy, + enum power_supply_property prop) +{ + switch (prop) { + case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX: + case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX: + case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT: + return true; + default: + return false; + } +} + +static enum power_supply_usb_type bq25703_usb_types[] = { + POWER_SUPPLY_USB_TYPE_C, + POWER_SUPPLY_USB_TYPE_PD, + POWER_SUPPLY_USB_TYPE_PD_DRP, + POWER_SUPPLY_USB_TYPE_PD_PPS, + POWER_SUPPLY_USB_TYPE_UNKNOWN, +}; + +/** + * bq257xx_external_power_changed() - Handler for external power change + * @psy: Power supply data + * + * When the external power into the charger is changed, check the USB + * type so that it can be reported. Additionally, update the max input + * current and max charging current to the value reported if it is a + * USB PD charger, otherwise use the default value. Note that each time + * a charger is removed the max charge current register is erased, so + * it must be set again each time the input changes or the device will + * not charge. + */ +static void bq257xx_external_power_changed(struct power_supply *psy) +{ + struct bq257xx_chg *pdata = power_supply_get_drvdata(psy); + union power_supply_propval val; + int ret; + int imax = pdata->iindpm_max; + + pdata->chip->bq257xx_get_state(pdata); + + pdata->supplied = power_supply_am_i_supplied(pdata->charger); + if (pdata->supplied < 0) + return; + + if (pdata->supplied == 0) + goto out; + + ret = power_supply_get_property_from_supplier(psy, + POWER_SUPPLY_PROP_USB_TYPE, + &val); + if (ret) + return; + + pdata->usb_type = val.intval; + + if ((pdata->usb_type == POWER_SUPPLY_USB_TYPE_PD) || + (pdata->usb_type == POWER_SUPPLY_USB_TYPE_PD_DRP) || + (pdata->usb_type == POWER_SUPPLY_USB_TYPE_PD)) { + ret = power_supply_get_property_from_supplier(psy, + POWER_SUPPLY_PROP_CURRENT_MAX, + &val); + if (ret) + return; + + if (val.intval) + imax = val.intval; + } + + if (pdata->supplied) { + pdata->chip->bq257xx_set_ichg(pdata, imax); + pdata->chip->bq257xx_set_iindpm(pdata, imax); + pdata->chip->bq257xx_set_vbatreg(pdata, pdata->vbat_max); + } + +out: + power_supply_changed(psy); +} + +static irqreturn_t bq257xx_irq_handler_thread(int irq, void *private) +{ + struct bq257xx_chg *pdata = private; + + bq257xx_external_power_changed(pdata->charger); + return IRQ_HANDLED; +} + +static const struct power_supply_desc bq257xx_power_supply_desc = { + .name = "bq257xx-charger", + .type = POWER_SUPPLY_TYPE_USB, + .usb_types = bq25703_usb_types, + .num_usb_types = ARRAY_SIZE(bq25703_usb_types), + .properties = bq257xx_power_supply_props, + .num_properties = ARRAY_SIZE(bq257xx_power_supply_props), + .get_property = bq257xx_get_charger_property, + .set_property = bq257xx_set_charger_property, + .property_is_writeable = bq257xx_property_is_writeable, + .external_power_changed = bq257xx_external_power_changed, +}; + +static const struct bq257xx_chip_info bq25703_chip_info = { + .bq257xx_hw_init = &bq25703_hw_init, + .bq257xx_hw_shutdown = &bq25703_hw_shutdown, + .bq257xx_get_state = &bq25703_get_state, + .bq257xx_set_ichg = &bq25703_set_ichg_cur, + .bq257xx_set_vbatreg = &bq25703_set_chrg_volt, + .bq257xx_set_iindpm = &bq25703_set_iindpm, +}; + +static int bq257xx_power_supply_init(struct bq257xx_chg *pdata, + struct power_supply_config *psy_cfg, struct device *dev) +{ + pdata->charger = devm_power_supply_register(dev, + &bq257xx_power_supply_desc, + psy_cfg); + if (IS_ERR(pdata->charger)) { + dev_err_probe(dev, PTR_ERR(pdata->charger), + "power supply register charger failed: %ld\n", + PTR_ERR(pdata->charger)); + return PTR_ERR(pdata->charger); + } + + return 0; +} + +/** + * bq257xx_parse_dt() - Parse the device tree for required properties + * @pdata: driver platform data + * @psy_cfg: power supply config data + * @dev: device struct + * + * Read the device tree to identify the minimum system voltage, the + * maximum charge current, the maximum charge voltage, and the maximum + * input current. + * + * Return: Returns 0 on success or error code on error. + */ +static int bq257xx_parse_dt(struct bq257xx_chg *pdata, + struct power_supply_config *psy_cfg, struct device *dev) +{ + int ret = 0; + + psy_cfg->drv_data = pdata; + psy_cfg->of_node = dev->of_node; + + ret = device_property_read_u32(dev, + "ti,minimum-sys-voltage", + &pdata->vsys_min); + if (ret) { + dev_err(dev, "Cannot read ti,minimum-sys-voltage from dt\n"); + return ret; + } + + ret = device_property_read_u32(dev, + "ti,charge-current", + &pdata->ichg_max); + if (ret) { + dev_err(dev, "Cannot read ti,charge-current from dt\n"); + return ret; + } + + ret = device_property_read_u32(dev, + "ti,max-charge-voltage", + &pdata->vbat_max); + if (ret) { + dev_err(dev, "Cannot read ti,max-charge-voltage from dt\n"); + return ret; + } + + ret = device_property_read_u32(dev, + "ti,current-limit", + &pdata->iindpm_max); + if (ret) + pdata->iindpm_max = BQ25703_IINDPM_DEFAULT_UA; + + return 0; +} + +static int bq257xx_charger_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct bq257xx_device *bq = dev_get_drvdata(pdev->dev.parent); + struct bq257xx_chg *pdata; + struct power_supply_config psy_cfg = { }; + int ret; + + pdev->dev.of_node = pdev->dev.parent->of_node; + pdev->dev.of_node_reused = true; + + pdata = devm_kzalloc(&pdev->dev, sizeof(struct bq257xx_chg), GFP_KERNEL); + if (!pdata) + return -ENOMEM; + + pdata->bq = bq; + + switch (pdata->bq->variant) { + case BQ25703A: + pdata->chip = &bq25703_chip_info; + break; + default: + return -EINVAL; + } + + ret = bq257xx_parse_dt(pdata, &psy_cfg, dev); + if (ret) { + dev_err(dev, "Failed to read device tree properties%d\n", ret); + return ret; + } + + ret = pdata->chip->bq257xx_hw_init(pdata); + if (ret) { + dev_err(dev, "Cannot initialize the chip.\n"); + return ret; + } + + ret = bq257xx_power_supply_init(pdata, &psy_cfg, dev); + if (ret) + return ret; + + platform_set_drvdata(pdev, pdata); + + if (bq->client->irq) { + ret = devm_request_threaded_irq(dev, bq->client->irq, NULL, + bq257xx_irq_handler_thread, + IRQF_TRIGGER_RISING | + IRQF_TRIGGER_FALLING | + IRQF_ONESHOT, + dev_name(&bq->client->dev), pdata); + if (ret < 0) { + dev_err(dev, "get irq fail: %d\n", ret); + return ret; + } + } + + return ret; +} + +static void bq257xx_charger_shutdown(struct platform_device *pdev) +{ + struct bq257xx_chg *pdata = platform_get_drvdata(pdev); + + pdata->chip->bq257xx_hw_shutdown(pdata); +} + +static struct platform_driver bq257xx_chg_driver = { + .driver = { + .name = "bq257xx-charger", + }, + .probe = bq257xx_charger_probe, + .shutdown = bq257xx_charger_shutdown, +}; +module_platform_driver(bq257xx_chg_driver); + +MODULE_DESCRIPTION("bq257xx charger driver"); +MODULE_AUTHOR("Chris Morgan <macromorgan@xxxxxxxxxxx>"); +MODULE_LICENSE("GPL"); -- 2.34.1
