[RFC 3/5] power: supply: bq257xx: Add support for BQ257XX charger manager
Chris Morgan
macroalpha82 at gmail.com
Thu Aug 29 14:31:00 PDT 2024
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>
---
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 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/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 at hotmail.com>");
+MODULE_LICENSE("GPL");
--
2.34.1
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