@@ -640,6 +640,17 @@ config BATTERY_PM8916_BMS_VM
To compile this driver as module, choose M here: the
module will be called pm8916_bms_vm.
+config CHARGER_PM8916_LBC
+ tristate "Qualcomm PM8916 Linear Battery Charger support"
+ depends on MFD_SPMI_PMIC || COMPILE_TEST
+ help
+ Say Y here to add support for Linear Battery Charger block
+ found in some Qualcomm PMICs such as PM8916. This hardware
+ blokc provides simple CC/CV battery charger.
+
+ To compile this driver as module, choose M here: the
+ module will be called pm8916_lbc.
+
config CHARGER_BQ2415X
tristate "TI BQ2415x battery charger driver"
depends on I2C
@@ -85,6 +85,7 @@ obj-$(CONFIG_CHARGER_MT6360) += mt6360_charger.o
obj-$(CONFIG_CHARGER_MT6370) += mt6370-charger.o
obj-$(CONFIG_CHARGER_QCOM_SMBB) += qcom_smbb.o
obj-$(CONFIG_BATTERY_PM8916_BMS_VM) += pm8916_bms_vm.o
+obj-$(CONFIG_CHARGER_PM8916_LBC) += pm8916_lbc.o
obj-$(CONFIG_CHARGER_BQ2415X) += bq2415x_charger.o
obj-$(CONFIG_CHARGER_BQ24190) += bq24190_charger.o
obj-$(CONFIG_CHARGER_BQ24257) += bq24257_charger.o
new file mode 100644
@@ -0,0 +1,381 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2023, Nikita Travkin <nikita@trvn.ru>
+ */
+
+#include <linux/errno.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/power_supply.h>
+#include <linux/property.h>
+#include <linux/regmap.h>
+#include <linux/slab.h>
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/extcon-provider.h>
+#include <linux/mod_devicetable.h>
+
+/* Two bytes: type + subtype */
+#define PM8916_PERPH_TYPE 0x04
+#define PM8916_LBC_CHGR_TYPE 0x1502
+#define PM8916_LBC_BAT_IF_TYPE 0x1602
+#define PM8916_LBC_USB_TYPE 0x1702
+#define PM8916_LBC_MISC_TYPE 0x1802
+
+#define PM8916_LBC_CHGR_CHG_OPTION 0x08
+#define PM8916_LBC_CHGR_PMIC_CHARGER BIT(7)
+
+#define PM8916_LBC_CHGR_CHG_STATUS 0x09
+
+#define PM8916_INT_RT_STS 0x10
+
+#define PM8916_LBC_USB_USBIN_VALID BIT(1)
+
+#define PM8916_LBC_CHGR_VDD_MAX 0x40
+#define PM8916_LBC_CHGR_VDD_SAFE 0x41
+#define PM8916_LBC_CHGR_IBAT_MAX 0x44
+#define PM8916_LBC_CHGR_IBAT_SAFE 0x45
+
+#define PM8916_LBC_CHGR_TCHG_MAX_EN 0x60
+#define PM8916_LBC_CHGR_TCHG_MAX_ENABLED BIT(7)
+#define PM8916_LBC_CHGR_TCHG_MAX 0x61
+
+#define PM8916_LBC_CHGR_CHG_CTRL 0x49
+#define PM8916_LBC_CHGR_CHG_EN BIT(7)
+#define PM8916_LBC_CHGR_PSTG_EN BIT(5)
+
+#define PM8916_LBC_CHGR_MIN_CURRENT 90000
+#define PM8916_LBC_CHGR_MAX_CURRENT 1440000
+
+#define PM8916_LBC_CHGR_MIN_VOLTAGE 4000000
+#define PM8916_LBC_CHGR_MAX_VOLTAGE 4775000
+#define PM8916_LBC_CHGR_VOLTAGE_STEP 25000
+
+#define PM8916_LBC_CHGR_MIN_TIME 4
+#define PM8916_LBC_CHGR_MAX_TIME 256
+
+struct pm8916_lbc_charger {
+ struct device *dev;
+ struct extcon_dev *edev;
+ struct power_supply *charger;
+ struct power_supply_battery_info *info;
+ struct regmap *regmap;
+ unsigned int reg[4];
+ bool online;
+ unsigned int charge_voltage_max;
+ unsigned int charge_voltage_safe;
+ unsigned int charge_current_max;
+ unsigned int charge_current_safe;
+};
+
+static const unsigned int pm8916_lbc_charger_cable[] = {
+ EXTCON_USB,
+ EXTCON_NONE,
+};
+
+enum {
+ LBC_CHGR = 0,
+ LBC_BAT_IF,
+ LBC_USB,
+ LBC_MISC,
+};
+
+static int pm8916_lbc_charger_configure(struct pm8916_lbc_charger *chg)
+{
+ int ret = 0;
+ unsigned int tmp;
+
+ chg->charge_voltage_max = clamp_t(u32, chg->charge_voltage_max,
+ PM8916_LBC_CHGR_MIN_VOLTAGE, chg->charge_voltage_safe);
+
+ tmp = chg->charge_voltage_max - PM8916_LBC_CHGR_MIN_VOLTAGE;
+ tmp /= PM8916_LBC_CHGR_VOLTAGE_STEP;
+ chg->charge_voltage_max = PM8916_LBC_CHGR_MIN_VOLTAGE + tmp * PM8916_LBC_CHGR_VOLTAGE_STEP;
+
+ ret = regmap_write(chg->regmap, chg->reg[LBC_CHGR] + PM8916_LBC_CHGR_VDD_MAX, tmp);
+ if (ret)
+ goto error;
+
+ chg->charge_current_max = min(chg->charge_current_max, chg->charge_current_safe);
+
+ tmp = clamp_t(u32, chg->charge_current_max,
+ PM8916_LBC_CHGR_MIN_CURRENT, PM8916_LBC_CHGR_MAX_CURRENT);
+
+ tmp = chg->charge_current_max / PM8916_LBC_CHGR_MIN_CURRENT - 1;
+ chg->charge_current_max = (tmp + 1) * PM8916_LBC_CHGR_MIN_CURRENT;
+
+ ret = regmap_write(chg->regmap, chg->reg[LBC_CHGR] + PM8916_LBC_CHGR_IBAT_MAX, tmp);
+ if (ret)
+ goto error;
+
+ ret = regmap_write(chg->regmap, chg->reg[LBC_CHGR] + PM8916_LBC_CHGR_CHG_CTRL,
+ PM8916_LBC_CHGR_CHG_EN | PM8916_LBC_CHGR_PSTG_EN);
+ if (ret)
+ goto error;
+
+ return ret;
+
+error:
+ dev_err(chg->dev, "Failed to configure charging: %pe\n", ERR_PTR(ret));
+ return ret;
+}
+
+static int pm8916_lbc_charger_get_property(struct power_supply *psy,
+ enum power_supply_property psp,
+ union power_supply_propval *val)
+{
+ struct pm8916_lbc_charger *chg = power_supply_get_drvdata(psy);
+
+ switch (psp) {
+ case POWER_SUPPLY_PROP_ONLINE:
+ val->intval = chg->online;
+ return 0;
+
+ case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX:
+ val->intval = chg->charge_voltage_max;
+ return 0;
+
+ case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
+ val->intval = chg->charge_current_max;
+ return 0;
+
+ default:
+ return -EINVAL;
+ };
+}
+
+static int pm8916_lbc_charger_set_property(struct power_supply *psy,
+ enum power_supply_property prop,
+ const union power_supply_propval *val)
+{
+ struct pm8916_lbc_charger *chg = power_supply_get_drvdata(psy);
+
+ switch (prop) {
+ case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
+ chg->charge_current_max = val->intval;
+ return pm8916_lbc_charger_configure(chg);
+ default:
+ return -EINVAL;
+ }
+}
+
+static int pm8916_lbc_charger_property_is_writeable(struct power_supply *psy,
+ enum power_supply_property psp)
+{
+ switch (psp) {
+ case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
+ return true;
+ default:
+ return false;
+ }
+}
+
+static enum power_supply_property pm8916_lbc_charger_properties[] = {
+ POWER_SUPPLY_PROP_ONLINE,
+ POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX,
+ POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT,
+};
+
+static irqreturn_t pm8916_lbc_charger_state_changed_irq(int irq, void *data)
+{
+ struct pm8916_lbc_charger *chg = data;
+ unsigned int tmp;
+ int ret;
+
+ ret = regmap_read(chg->regmap, chg->reg[LBC_USB] + PM8916_INT_RT_STS, &tmp);
+ if (ret)
+ return IRQ_HANDLED;
+
+ chg->online = !!(tmp & PM8916_LBC_USB_USBIN_VALID);
+ extcon_set_state_sync(chg->edev, EXTCON_USB, chg->online);
+
+ power_supply_changed(chg->charger);
+
+ return IRQ_HANDLED;
+}
+
+static int pm8916_lbc_charger_probe_dt(struct pm8916_lbc_charger *chg)
+{
+ struct device *dev = chg->dev;
+ int ret = 0;
+ unsigned int tmp;
+
+ ret = device_property_read_u32(dev, "qcom,fast-charge-safe-voltage", &chg->charge_voltage_safe);
+ if (ret)
+ return ret;
+ if (chg->charge_voltage_safe < PM8916_LBC_CHGR_MIN_VOLTAGE)
+ return -EINVAL;
+
+ chg->charge_voltage_safe = clamp_t(u32, chg->charge_voltage_safe,
+ PM8916_LBC_CHGR_MIN_VOLTAGE, PM8916_LBC_CHGR_MAX_VOLTAGE);
+
+ tmp = chg->charge_voltage_safe - PM8916_LBC_CHGR_MIN_VOLTAGE;
+ tmp /= PM8916_LBC_CHGR_VOLTAGE_STEP;
+ ret = regmap_write(chg->regmap, chg->reg[LBC_CHGR] + PM8916_LBC_CHGR_VDD_SAFE, tmp);
+ if (ret)
+ return ret;
+
+ ret = device_property_read_u32(dev, "qcom,fast-charge-safe-current", &chg->charge_current_safe);
+ if (ret)
+ return ret;
+ if (chg->charge_current_safe < PM8916_LBC_CHGR_MIN_CURRENT)
+ return -EINVAL;
+
+ chg->charge_current_safe = clamp_t(u32, chg->charge_current_safe,
+ PM8916_LBC_CHGR_MIN_CURRENT, PM8916_LBC_CHGR_MAX_CURRENT);
+
+ chg->charge_current_max = chg->charge_current_safe;
+
+ tmp = chg->charge_current_safe / PM8916_LBC_CHGR_MIN_CURRENT - 1;
+ ret = regmap_write(chg->regmap, chg->reg[LBC_CHGR] + PM8916_LBC_CHGR_IBAT_SAFE, tmp);
+ if (ret)
+ return ret;
+
+ /* Disable charger timeout. */
+ ret = regmap_write(chg->regmap, chg->reg[LBC_CHGR] + PM8916_LBC_CHGR_TCHG_MAX_EN, 0x00);
+ if (ret)
+ return ret;
+
+ return ret;
+}
+
+static const struct power_supply_desc pm8916_lbc_charger_psy_desc = {
+ .name = "pm8916-lbc-chgr",
+ .type = POWER_SUPPLY_TYPE_USB,
+ .properties = pm8916_lbc_charger_properties,
+ .num_properties = ARRAY_SIZE(pm8916_lbc_charger_properties),
+ .get_property = pm8916_lbc_charger_get_property,
+ .set_property = pm8916_lbc_charger_set_property,
+ .property_is_writeable = pm8916_lbc_charger_property_is_writeable,
+};
+
+static int pm8916_lbc_charger_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct pm8916_lbc_charger *chg;
+ struct power_supply_config psy_cfg = {};
+ int ret, len, irq;
+ unsigned int tmp;
+
+ chg = devm_kzalloc(dev, sizeof(*chg), GFP_KERNEL);
+ if (!chg)
+ return -ENOMEM;
+
+ chg->dev = dev;
+
+ chg->regmap = dev_get_regmap(pdev->dev.parent, NULL);
+ if (!chg->regmap)
+ return -ENODEV;
+
+ len = device_property_count_u32(dev, "reg");
+ if (len < 0)
+ return len;
+ if (len != 4)
+ return dev_err_probe(dev, -EINVAL,
+ "Wrong amount of reg values: %d (4 expected)\n", len);
+
+ irq = platform_get_irq_byname(pdev, "usb_vbus");
+ if (irq < 0)
+ return irq;
+
+ ret = devm_request_threaded_irq(dev, irq, NULL, pm8916_lbc_charger_state_changed_irq,
+ IRQF_ONESHOT, "pm8916_lbc", chg);
+ if (ret)
+ return ret;
+
+ ret = device_property_read_u32_array(dev, "reg", chg->reg, len);
+ if (ret)
+ return ret;
+
+ ret = regmap_bulk_read(chg->regmap, chg->reg[LBC_CHGR] + PM8916_PERPH_TYPE, &tmp, 2);
+ if (ret)
+ goto comm_error;
+ if (tmp != PM8916_LBC_CHGR_TYPE)
+ goto type_error;
+
+ ret = regmap_bulk_read(chg->regmap, chg->reg[LBC_BAT_IF] + PM8916_PERPH_TYPE, &tmp, 2);
+ if (ret)
+ goto comm_error;
+ if (tmp != PM8916_LBC_BAT_IF_TYPE)
+ goto type_error;
+
+ ret = regmap_bulk_read(chg->regmap, chg->reg[LBC_USB] + PM8916_PERPH_TYPE, &tmp, 2);
+ if (ret)
+ goto comm_error;
+ if (tmp != PM8916_LBC_USB_TYPE)
+ goto type_error;
+
+ ret = regmap_bulk_read(chg->regmap, chg->reg[LBC_MISC] + PM8916_PERPH_TYPE, &tmp, 2);
+ if (ret)
+ goto comm_error;
+ if (tmp != PM8916_LBC_MISC_TYPE)
+ goto type_error;
+
+ ret = regmap_read(chg->regmap, chg->reg[LBC_CHGR] + PM8916_LBC_CHGR_CHG_OPTION, &tmp);
+ if (ret)
+ goto comm_error;
+ if (tmp != PM8916_LBC_CHGR_PMIC_CHARGER)
+ dev_err_probe(dev, -ENODEV, "The system is using an external charger\n");
+
+ ret = pm8916_lbc_charger_probe_dt(chg);
+ if (ret)
+ dev_err_probe(dev, ret, "Error while parsing device tree\n");
+
+ psy_cfg.drv_data = chg;
+ psy_cfg.of_node = dev->of_node;
+
+ chg->charger = devm_power_supply_register(dev, &pm8916_lbc_charger_psy_desc, &psy_cfg);
+ if (IS_ERR(chg->charger))
+ return dev_err_probe(dev, PTR_ERR(chg->charger), "Unable to register charger\n");
+
+ ret = power_supply_get_battery_info(chg->charger, &chg->info);
+ if (ret)
+ return dev_err_probe(dev, ret, "Unable to get battery info\n");
+
+ chg->edev = devm_extcon_dev_allocate(dev, pm8916_lbc_charger_cable);
+ if (IS_ERR(chg->edev))
+ return PTR_ERR(chg->edev);
+
+ ret = devm_extcon_dev_register(dev, chg->edev);
+ if (ret < 0)
+ return dev_err_probe(dev, ret, "failed to register extcon device\n");
+
+ ret = regmap_read(chg->regmap, chg->reg[LBC_USB] + PM8916_INT_RT_STS, &tmp);
+ if (ret)
+ goto comm_error;
+
+ chg->online = !!(tmp & PM8916_LBC_USB_USBIN_VALID);
+ extcon_set_state_sync(chg->edev, EXTCON_USB, chg->online);
+
+ chg->charge_voltage_max = chg->info->voltage_max_design_uv;
+ ret = pm8916_lbc_charger_configure(chg);
+ if (ret)
+ return ret;
+
+ return 0;
+
+comm_error:
+ return dev_err_probe(dev, ret, "Unable to communicate with device\n");
+
+type_error:
+ return dev_err_probe(dev, -ENODEV, "Device reported wrong type: 0x%X\n", tmp);
+}
+
+static const struct of_device_id pm8916_lbc_charger_of_match[] = {
+ { .compatible = "qcom,pm8916-lbc", },
+ {}
+};
+MODULE_DEVICE_TABLE(of, pm8916_lbc_charger_of_match);
+
+static struct platform_driver pm8916_lbc_charger_driver = {
+ .driver = {
+ .name = "pm8916-lbc",
+ .of_match_table = pm8916_lbc_charger_of_match,
+ },
+ .probe = pm8916_lbc_charger_probe,
+};
+module_platform_driver(pm8916_lbc_charger_driver);
+
+MODULE_DESCRIPTION("pm8916 LBC driver");
+MODULE_AUTHOR("Nikita Travkin <nikita@trvn.ru>");
+MODULE_LICENSE("GPL");