[PATCH V3 3/5] power: supply: bq257xx: Add support for BQ257XX charger
Sebastian Reichel
sebastian.reichel at collabora.com
Mon Jun 23 10:47:25 PDT 2025
Hi,
On Mon, Jun 23, 2025 at 11:22:21AM -0500, Chris Morgan wrote:
> From: Chris Morgan <macromorgan at hotmail.com>
>
> 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 at hotmail.com>
> ---
Reviewed-by: Sebastian Reichel <sebastian.reichel at collabora.com>
Greetings,
-- Sebastian
> drivers/power/supply/Kconfig | 7 +
> drivers/power/supply/Makefile | 1 +
> drivers/power/supply/bq257xx_charger.c | 754 +++++++++++++++++++++++++
> 3 files changed, 762 insertions(+)
> create mode 100644 drivers/power/supply/bq257xx_charger.c
>
> diff --git a/drivers/power/supply/Kconfig b/drivers/power/supply/Kconfig
> index 79ddb006e2da..11893c50c5d2 100644
> --- a/drivers/power/supply/Kconfig
> +++ b/drivers/power/supply/Kconfig
> @@ -767,6 +767,13 @@ 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 4f5f8e3507f8..425caeb31fc2 100644
> --- a/drivers/power/supply/Makefile
> +++ b/drivers/power/supply/Makefile
> @@ -97,6 +97,7 @@ 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..749c471eccb1
> --- /dev/null
> +++ b/drivers/power/supply/bq257xx_charger.c
> @@ -0,0 +1,754 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * BQ257XX Battery Charger Driver
> + * Copyright (C) 2024 Chris Morgan <macromorgan at hotmail.com>
> + * 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/interrupt.h>
> +#include <linux/mfd/bq257xx.h>
> +#include <linux/platform_device.h>
> +#include <linux/power_supply.h>
> +#include <linux/property.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)
> + */
> +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
> + * @chip: hw specific functions
> + * @bq: 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
> + * @intval: value for minimum voltage
> + *
> + * Return: Returns 0 on success or error on failure to read.
> + */
> +static int bq25703_get_min_vsys(struct bq257xx_chg *pdata, int *intval)
> +{
> + 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);
> + *intval = (reg * BQ25703_MINVSYS_STEP_UV) + BQ25703_MINVSYS_MIN_UV;
> +
> + return ret;
> +}
> +
> +/**
> + * bq25703_set_min_vsys() - Set the minimum system voltage
> + * @pdata: driver platform data
> + * @vsys: 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
> + * @intval: value of reported battery current
> + *
> + * Read the reported current from the battery. Since value is always
> + * positive set sign to negative if discharging.
> + *
> + * Return: Returns 0 on success or error if unable to read value.
> + */
> +static int bq25703_get_cur(struct bq257xx_chg *pdata, int *intval)
> +{
> + unsigned int reg;
> + int ret;
> +
> + ret = regmap_read(pdata->bq->regmap, BQ25703_ADCIBAT_CHG, ®);
> + if (ret < 0)
> + return ret;
> +
> + if (pdata->online)
> + *intval = FIELD_GET(BQ25703_ADCIBAT_CHG_MASK, reg) *
> + BQ25703_ADCIBAT_CHG_STEP_UA;
> + else
> + *intval = -(FIELD_GET(BQ25703_ADCIBAT_DISCHG_MASK, reg) *
> + BQ25703_ADCIBAT_DIS_STEP_UA);
> +
> + return ret;
> +}
> +
> +/**
> + * bq25703_get_ichg_cur() - Get the maximum reported charge current
> + * @pdata: driver platform data
> + * @intval: value of maximum reported charge current
> + *
> + * Get the maximum reported charge current from the battery.
> + *
> + * Return: Returns 0 on success or error if unable to read value.
> + */
> +static int bq25703_get_ichg_cur(struct bq257xx_chg *pdata, int *intval)
> +{
> + unsigned int reg;
> + int ret;
> +
> + ret = regmap_read(pdata->bq->regmap, BQ25703_CHARGE_CURRENT, ®);
> + if (ret)
> + return ret;
> +
> + *intval = FIELD_GET(BQ25703_ICHG_MASK, reg) * BQ25703_ICHG_STEP_UA;
> +
> + return ret;
> +}
> +
> +/**
> + * 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
> + * @intval: maximum charge voltage value
> + *
> + * Return: Returns 0 on success or error if unable to read value.
> + */
> +static int bq25703_get_chrg_volt(struct bq257xx_chg *pdata, int *intval)
> +{
> + unsigned int reg;
> + int ret;
> +
> + ret = regmap_read(pdata->bq->regmap, BQ25703_MAX_CHARGE_VOLT,
> + ®);
> + if (ret)
> + return ret;
> +
> + *intval = FIELD_GET(BQ25703_MAX_CHARGE_VOLT_MASK, reg) *
> + BQ25703_VBATREG_STEP_UV;
> +
> + return ret;
> +}
> +
> +/**
> + * 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
> + * @intval: maximum input current value
> + *
> + * Read the actual input current limit from the device into intval.
> + * 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 0 on success or error if unable to read register
> + * value.
> + */
> +static int bq25703_get_iindpm(struct bq257xx_chg *pdata, int *intval)
> +{
> + 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);
> + *intval = (reg * BQ25703_IINDPM_STEP_UA) + BQ25703_IINDPM_OFFSET_UA;
> +
> + return ret;
> +}
> +
> +/**
> + * 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
> + * @intval: value of reported battery voltage
> + *
> + * Read value of battery voltage into intval.
> + *
> + * Return: Returns 0 on success or error if unable to read value.
> + */
> +static int bq25703_get_vbat(struct bq257xx_chg *pdata, int *intval)
> +{
> + unsigned int reg;
> + int ret;
> +
> + ret = regmap_read(pdata->bq->regmap, BQ25703_ADCVSYSVBAT, ®);
> + if (ret)
> + return ret;
> +
> + reg = FIELD_GET(BQ25703_ADCVBAT_MASK, reg);
> + *intval = (reg * BQ25703_ADCVSYSVBAT_STEP) + BQ25703_ADCVSYSVBAT_OFFSET_UV;
> +
> + return ret;
> +}
> +
> +/**
> + * 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)
> +{
> + struct regmap *regmap = pdata->bq->regmap;
> + int ret = 0;
> +
> + regmap_update_bits(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(regmap, BQ25703_CHARGE_OPTION_0,
> + BQ25703_EN_LWPWR, !BQ25703_EN_LWPWR);
> +
> + regmap_update_bits(regmap, BQ25703_ADC_OPTION,
> + BQ25703_ADC_CONV_EN, BQ25703_ADC_CONV_EN);
> +
> + regmap_update_bits(regmap, BQ25703_ADC_OPTION,
> + BQ25703_ADC_START, BQ25703_ADC_START);
> +
> + regmap_update_bits(regmap, BQ25703_ADC_OPTION,
> + BQ25703_ADC_FULL_SCALE, BQ25703_ADC_FULL_SCALE);
> +
> + regmap_update_bits(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);
> +
> + switch (prop) {
> + case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
> + return pdata->chip->bq257xx_set_iindpm(pdata, val->intval);
> +
> + case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX:
> + return pdata->chip->bq257xx_set_vbatreg(pdata, val->intval);
> +
> + case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX:
> + return pdata->chip->bq257xx_set_ichg(pdata, val->intval);
> +
> + default:
> + break;
> + }
> +
> + return -EINVAL;
> +}
> +
> +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 (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 = "Texas Instruments";
> + break;
> +
> + case POWER_SUPPLY_PROP_ONLINE:
> + val->intval = pdata->online;
> + break;
> +
> + case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
> + return bq25703_get_iindpm(pdata, &val->intval);
> +
> + case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX:
> + return bq25703_get_chrg_volt(pdata, &val->intval);
> +
> + case POWER_SUPPLY_PROP_CURRENT_NOW:
> + return bq25703_get_cur(pdata, &val->intval);
> +
> + case POWER_SUPPLY_PROP_VOLTAGE_NOW:
> + return bq25703_get_vbat(pdata, &val->intval);
> +
> + case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX:
> + return bq25703_get_ichg_cur(pdata, &val->intval);
> +
> + case POWER_SUPPLY_PROP_VOLTAGE_MIN:
> + return bq25703_get_min_vsys(pdata, &val->intval);
> +
> + 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;
> + }
> +}
> +
> +/**
> + * 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_PPS)) {
> + 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, pdata->ichg_max);
> + 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 = BIT(POWER_SUPPLY_USB_TYPE_C) |
> + BIT(POWER_SUPPLY_USB_TYPE_PD) |
> + BIT(POWER_SUPPLY_USB_TYPE_PD_DRP) |
> + BIT(POWER_SUPPLY_USB_TYPE_PD_PPS) |
> + BIT(POWER_SUPPLY_USB_TYPE_UNKNOWN),
> + .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,
> +};
> +
> +/**
> + * 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)
> +{
> + struct power_supply_battery_info *bat_info;
> + int ret;
> +
> + ret = power_supply_get_battery_info(pdata->charger,
> + &bat_info);
> + if (ret)
> + return dev_err_probe(dev, ret,
> + "Unable to get battery info\n");
> +
> + if ((bat_info->voltage_min_design_uv <= 0) ||
> + (bat_info->constant_charge_voltage_max_uv <= 0) ||
> + (bat_info->constant_charge_current_max_ua <= 0))
> + return dev_err_probe(dev, -EINVAL,
> + "Required bat info missing or invalid\n");
> +
> + pdata->vsys_min = bat_info->voltage_min_design_uv;
> + pdata->vbat_max = bat_info->constant_charge_voltage_max_uv;
> + pdata->ichg_max = bat_info->constant_charge_current_max_ua;
> +
> + power_supply_put_battery_info(pdata->charger, bat_info);
> +
> + ret = device_property_read_u32(dev,
> + "input-current-limit-microamp",
> + &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;
> +
> + device_set_of_node_from_dev(dev, pdev->dev.parent);
> +
> + pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
> + if (!pdata)
> + return -ENOMEM;
> +
> + pdata->bq = bq;
> + pdata->chip = &bq25703_chip_info;
> +
> + platform_set_drvdata(pdev, pdata);
> +
> + psy_cfg.drv_data = pdata;
> + psy_cfg.fwnode = dev_fwnode(dev);
> +
> + pdata->charger = devm_power_supply_register(dev,
> + &bq257xx_power_supply_desc,
> + &psy_cfg);
> + if (IS_ERR(pdata->charger))
> + return dev_err_probe(dev, PTR_ERR(pdata->charger),
> + "Power supply register charger failed\n");
> +
> + ret = bq257xx_parse_dt(pdata, &psy_cfg, dev);
> + if (ret)
> + return ret;
> +
> + ret = pdata->chip->bq257xx_hw_init(pdata);
> + if (ret)
> + return dev_err_probe(dev, ret, "Cannot initialize the charger\n");
> +
> + 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 at hotmail.com>");
> +MODULE_LICENSE("GPL");
> --
> 2.43.0
>
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