@@ -493,6 +493,16 @@ config CHARGER_TWL4030
help
Say Y here to enable support for TWL4030 Battery Charge Interface.
+config CHARGER_TWL6030
+ tristate "OMAP TWL6030 BCI charger driver"
+ depends on IIO && TWL4030_CORE
+ help
+ Say Y here to enable support for TWL6030/6032 Battery Charge
+ Interface.
+
+ This driver can be build as a module. If so, the module will be
+ called twl6030_charger.
+
config CHARGER_LP8727
tristate "TI/National Semiconductor LP8727 charger driver"
depends on I2C
@@ -69,6 +69,7 @@ obj-$(CONFIG_CHARGER_CPCAP) += cpcap-charger.o
obj-$(CONFIG_CHARGER_ISP1704) += isp1704_charger.o
obj-$(CONFIG_CHARGER_MAX8903) += max8903_charger.o
obj-$(CONFIG_CHARGER_TWL4030) += twl4030_charger.o
+obj-$(CONFIG_CHARGER_TWL6030) += twl6030_charger.o
obj-$(CONFIG_CHARGER_LP8727) += lp8727_charger.o
obj-$(CONFIG_CHARGER_LP8788) += lp8788-charger.o
obj-$(CONFIG_CHARGER_GPIO) += gpio-charger.o
new file mode 100644
@@ -0,0 +1,566 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * TWL6030 charger
+ *
+ * Copyright (C) 2024 Andreas Kemnade <andreas@kemnade.info>
+ *
+ * based on older 6030 driver found in a v3.0 vendor kernel
+ *
+ * based on twl4030_bci_battery.c by TI
+ * Copyright (C) 2008 Texas Instruments, Inc.
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/err.h>
+#include <linux/of.h>
+#include <linux/bits.h>
+#include <linux/platform_device.h>
+#include <linux/interrupt.h>
+#include <linux/mfd/twl.h>
+#include <linux/power_supply.h>
+#include <linux/notifier.h>
+#include <linux/usb/otg.h>
+#include <linux/iio/consumer.h>
+#include <linux/devm-helpers.h>
+
+#define CONTROLLER_INT_MASK 0x00
+#define CONTROLLER_CTRL1 0x01
+#define CONTROLLER_WDG 0x02
+#define CONTROLLER_STAT1 0x03
+#define CHARGERUSB_INT_STATUS 0x04
+#define CHARGERUSB_INT_MASK 0x05
+#define CHARGERUSB_STATUS_INT1 0x06
+#define CHARGERUSB_STATUS_INT2 0x07
+#define CHARGERUSB_CTRL1 0x08
+#define CHARGERUSB_CTRL2 0x09
+#define CHARGERUSB_CTRL3 0x0A
+#define CHARGERUSB_STAT1 0x0B
+#define CHARGERUSB_VOREG 0x0C
+#define CHARGERUSB_VICHRG 0x0D
+#define CHARGERUSB_CINLIMIT 0x0E
+#define CHARGERUSB_CTRLLIMIT1 0x0F
+#define CHARGERUSB_CTRLLIMIT2 0x10
+#define ANTICOLLAPSE_CTRL1 0x11
+#define ANTICOLLAPSE_CTRL2 0x12
+
+/* TWL6032 registers 0xDA to 0xDE - TWL6032_MODULE_CHARGER */
+#define CONTROLLER_CTRL2 0x00
+#define CONTROLLER_VSEL_COMP 0x01
+#define CHARGERUSB_VSYSREG 0x02
+#define CHARGERUSB_VICHRG_PC 0x03
+#define LINEAR_CHRG_STS 0x04
+
+#define LINEAR_CHRG_STS_CRYSTL_OSC_OK 0x40
+#define LINEAR_CHRG_STS_END_OF_CHARGE 0x20
+#define LINEAR_CHRG_STS_VBATOV 0x10
+#define LINEAR_CHRG_STS_VSYSOV 0x08
+#define LINEAR_CHRG_STS_DPPM_STS 0x04
+#define LINEAR_CHRG_STS_CV_STS 0x02
+#define LINEAR_CHRG_STS_CC_STS 0x01
+
+#define FG_REG_00 0x00
+#define FG_REG_01 0x01
+#define FG_REG_02 0x02
+#define FG_REG_03 0x03
+#define FG_REG_04 0x04
+#define FG_REG_05 0x05
+#define FG_REG_06 0x06
+#define FG_REG_07 0x07
+#define FG_REG_08 0x08
+#define FG_REG_09 0x09
+#define FG_REG_10 0x0A
+#define FG_REG_11 0x0B
+
+/* CONTROLLER_INT_MASK */
+#define MVAC_FAULT BIT(7)
+#define MAC_EOC BIT(6)
+#define LINCH_GATED BIT(5)
+#define MBAT_REMOVED BIT(4)
+#define MFAULT_WDG BIT(3)
+#define MBAT_TEMP BIT(2)
+#define MVBUS_DET BIT(1)
+#define MVAC_DET BIT(0)
+
+/* CONTROLLER_CTRL1 */
+#define CONTROLLER_CTRL1_EN_LINCH BIT(5)
+#define CONTROLLER_CTRL1_EN_CHARGER BIT(4)
+#define CONTROLLER_CTRL1_SEL_CHARGER BIT(3)
+
+/* CONTROLLER_STAT1 */
+#define CONTROLLER_STAT1_EXTCHRG_STATZ BIT(7)
+#define CONTROLLER_STAT1_LINCH_GATED BIT(6)
+#define CONTROLLER_STAT1_CHRG_DET_N BIT(5)
+#define CONTROLLER_STAT1_FAULT_WDG BIT(4)
+#define CONTROLLER_STAT1_VAC_DET BIT(3)
+#define VAC_DET BIT(3)
+#define CONTROLLER_STAT1_VBUS_DET BIT(2)
+#define VBUS_DET BIT(2)
+#define CONTROLLER_STAT1_BAT_REMOVED BIT(1)
+#define CONTROLLER_STAT1_BAT_TEMP_OVRANGE BIT(0)
+
+/* CHARGERUSB_INT_STATUS */
+#define EN_LINCH BIT(4)
+#define CURRENT_TERM_INT BIT(3)
+#define CHARGERUSB_STAT BIT(2)
+#define CHARGERUSB_THMREG BIT(1)
+#define CHARGERUSB_FAULT BIT(0)
+
+/* CHARGERUSB_INT_MASK */
+#define MASK_MCURRENT_TERM BIT(3)
+#define MASK_MCHARGERUSB_STAT BIT(2)
+#define MASK_MCHARGERUSB_THMREG BIT(1)
+#define MASK_MCHARGERUSB_FAULT BIT(0)
+
+/* CHARGERUSB_STATUS_INT1 */
+#define CHARGERUSB_STATUS_INT1_TMREG BIT(7)
+#define CHARGERUSB_STATUS_INT1_NO_BAT BIT(6)
+#define CHARGERUSB_STATUS_INT1_BST_OCP BIT(5)
+#define CHARGERUSB_STATUS_INT1_TH_SHUTD BIT(4)
+#define CHARGERUSB_STATUS_INT1_BAT_OVP BIT(3)
+#define CHARGERUSB_STATUS_INT1_POOR_SRC BIT(2)
+#define CHARGERUSB_STATUS_INT1_SLP_MODE BIT(1)
+#define CHARGERUSB_STATUS_INT1_VBUS_OVP BIT(0)
+
+/* CHARGERUSB_STATUS_INT2 */
+#define ICCLOOP BIT(3)
+#define CURRENT_TERM BIT(2)
+#define CHARGE_DONE BIT(1)
+#define ANTICOLLAPSE BIT(0)
+
+/* CHARGERUSB_CTRL1 */
+#define SUSPEND_BOOT BIT(7)
+#define OPA_MODE BIT(6)
+#define HZ_MODE BIT(5)
+#define TERM BIT(4)
+
+/* CHARGERUSB_CTRL2 */
+#define UA_TO_VITERM(x) (((x) / 50000 - 1) << 5)
+
+/* CHARGERUSB_CTRL3 */
+#define VBUSCHRG_LDO_OVRD BIT(7)
+#define CHARGE_ONCE BIT(6)
+#define BST_HW_PR_DIS BIT(5)
+#define AUTOSUPPLY BIT(3)
+#define BUCK_HSILIM BIT(0)
+
+/* CHARGERUSB_VOREG */
+#define UV_TO_VOREG(x) (((x) - 3500000) / 20000)
+#define VOREG_TO_UV(x) (((x) & 0x3F) * 20000 + 3500000)
+#define CHARGERUSB_VOREG_3P52 0x01
+#define CHARGERUSB_VOREG_4P0 0x19
+#define CHARGERUSB_VOREG_4P2 0x23
+#define CHARGERUSB_VOREG_4P76 0x3F
+
+/* CHARGERUSB_VICHRG */
+/*
+ * might be inaccurate for < 500 mA, diffent scale might apply,
+ * either starting from 100 mA or 300 mA
+ */
+#define UA_TO_VICHRG(x) (((x) / 100000) - 1)
+#define VICHRG_TO_UA(x) (((x) & 0xf) * 100000 + 100000)
+
+/* CHARGERUSB_CINLIMIT */
+#define CHARGERUSB_CIN_LIMIT_100 0x1
+#define CHARGERUSB_CIN_LIMIT_300 0x5
+#define CHARGERUSB_CIN_LIMIT_500 0x9
+#define CHARGERUSB_CIN_LIMIT_NONE 0xF
+
+/* CHARGERUSB_CTRLLIMIT2 */
+#define CHARGERUSB_CTRLLIMIT2_1500 0x0E
+#define LOCK_LIMIT BIT(4)
+
+/* ANTICOLLAPSE_CTRL2 */
+#define BUCK_VTH_SHIFT 5
+
+/* FG_REG_00 */
+#define CC_ACTIVE_MODE_SHIFT 6
+#define CC_AUTOCLEAR BIT(2)
+#define CC_CAL_EN BIT(1)
+#define CC_PAUSE BIT(0)
+
+#define REG_TOGGLE1 0x90
+#define REG_PWDNSTATUS1 0x93
+#define FGDITHS BIT(7)
+#define FGDITHR BIT(6)
+#define FGS BIT(5)
+#define FGR BIT(4)
+#define BBSPOR_CFG 0xE6
+#define BB_CHG_EN BIT(3)
+
+struct twl6030_charger_info {
+ struct device *dev;
+ struct power_supply *usb;
+ struct power_supply_battery_info *binfo;
+ struct work_struct work;
+ int irq_chg;
+ int input_current_limit;
+ struct iio_channel *channel_vusb;
+ struct delayed_work charger_monitor;
+};
+
+static int twl6030_charger_read(u8 reg, u8 *val)
+{
+ return twl_i2c_read_u8(TWL_MODULE_MAIN_CHARGE, val, reg);
+}
+
+static int twl6030_charger_write(u8 reg, u8 val)
+{
+ return twl_i2c_write_u8(TWL_MODULE_MAIN_CHARGE, val, reg);
+}
+
+static int twl6030_config_cinlimit_reg(struct twl6030_charger_info *charger,
+ unsigned int ua)
+{
+ if (ua >= 50000 && ua <= 750000) {
+ ua = (ua - 50000) / 50000;
+ } else if ((ua > 750000) && (ua <= 1500000) &&
+ (device_is_compatible(charger->dev, "ti,twl6032-charger"))) {
+ ua = ((ua % 100000) ? 0x30 : 0x20) + ((ua - 100000) / 100000);
+ } else {
+ if (ua < 50000) {
+ dev_err(charger->dev, "invalid input current limit\n");
+ return -EINVAL;
+ }
+ /* This is no current limit */
+ ua = 0x0F;
+ }
+
+ return twl6030_charger_write(CHARGERUSB_CINLIMIT, ua);
+}
+
+/*
+ * rewriting all stuff here, resets to extremely conservative defaults were
+ * seen under some circumstances, like charge voltage to 3.5V
+ */
+static int twl6030_enable_usb(struct twl6030_charger_info *charger)
+{
+ int ret;
+
+ ret = twl6030_charger_write(CHARGERUSB_VICHRG,
+ UA_TO_VICHRG(charger->binfo->constant_charge_current_max_ua));
+ if (ret < 0)
+ return ret;
+
+ ret = twl6030_charger_write(CONTROLLER_WDG, 0xff);
+ if (ret < 0)
+ return ret;
+
+ charger->input_current_limit = 500000;
+ ret = twl6030_config_cinlimit_reg(charger, charger->input_current_limit);
+ if (ret < 0)
+ return ret;
+
+ ret = twl6030_charger_write(CHARGERUSB_CINLIMIT, CHARGERUSB_CIN_LIMIT_500);
+ if (ret < 0)
+ return ret;
+
+ ret = twl6030_charger_write(CHARGERUSB_VOREG,
+ UV_TO_VOREG(charger->binfo->constant_charge_voltage_max_uv));
+ if (ret < 0)
+ return ret;
+
+ ret = twl6030_charger_write(CHARGERUSB_CTRL1, TERM);
+ if (ret < 0)
+ return ret;
+
+ if (charger->binfo->charge_term_current_ua != -EINVAL) {
+ ret = twl6030_charger_write(CHARGERUSB_CTRL2,
+ UA_TO_VITERM(charger->binfo->charge_term_current_ua));
+ if (ret < 0)
+ return ret;
+ }
+
+ return twl6030_charger_write(CONTROLLER_CTRL1, CONTROLLER_CTRL1_EN_CHARGER);
+}
+
+static void twl6030_charger_wdg(struct work_struct *data)
+{
+ struct twl6030_charger_info *charger =
+ container_of(data, struct twl6030_charger_info,
+ charger_monitor.work);
+
+ u8 val;
+ u8 int_stat;
+ u8 stat_int1;
+ u8 stat_int2;
+
+ twl6030_charger_read(CONTROLLER_STAT1, &val);
+ twl6030_charger_read(CHARGERUSB_INT_STATUS, &int_stat);
+ twl6030_charger_read(CHARGERUSB_STATUS_INT1, &stat_int1);
+ twl6030_charger_read(CHARGERUSB_STATUS_INT2, &stat_int2);
+ dev_dbg(charger->dev,
+ "wdg: stat1: %02x %s INT_STATUS %02x STATUS_INT1 %02x STATUS_INT2 %02x\n",
+ val, (val & VBUS_DET) ? "usb online" : "usb offline",
+ int_stat, stat_int1, stat_int2);
+
+ twl6030_charger_write(CONTROLLER_WDG, 0xff);
+ schedule_delayed_work(&charger->charger_monitor,
+ msecs_to_jiffies(10000));
+}
+
+static irqreturn_t twl6030_charger_interrupt(int irq, void *arg)
+{
+ struct twl6030_charger_info *charger = arg;
+ u8 val;
+ u8 int_stat;
+ u8 stat_int1;
+ u8 stat_int2;
+
+ if (twl6030_charger_read(CONTROLLER_STAT1, &val) < 0)
+ return IRQ_HANDLED;
+
+ if (twl6030_charger_read(CHARGERUSB_INT_STATUS, &int_stat) < 0)
+ return IRQ_HANDLED;
+
+ if (twl6030_charger_read(CHARGERUSB_STATUS_INT1, &stat_int1) < 0)
+ return IRQ_HANDLED;
+
+ if (twl6030_charger_read(CHARGERUSB_STATUS_INT2, &stat_int2) < 0)
+ return IRQ_HANDLED;
+
+ dev_dbg(charger->dev,
+ "charger irq: stat1: %02x %s INT_STATUS %02x STATUS_INT1 %02x STATUS_INT2 %02x\n",
+ val, (val & VBUS_DET) ? "usb online" : "usb offline",
+ int_stat, stat_int1, stat_int2);
+ power_supply_changed(charger->usb);
+
+ if (val & VBUS_DET) {
+ if (twl6030_charger_read(CONTROLLER_CTRL1, &val) < 0)
+ return IRQ_HANDLED;
+
+ if (!(val & CONTROLLER_CTRL1_EN_CHARGER)) {
+ if (twl6030_enable_usb(charger) < 0)
+ return IRQ_HANDLED;
+
+ schedule_delayed_work(&charger->charger_monitor,
+ msecs_to_jiffies(10000));
+ }
+ } else {
+ cancel_delayed_work(&charger->charger_monitor);
+ }
+ return IRQ_HANDLED;
+}
+
+static int twl6030_charger_usb_get_property(struct power_supply *psy,
+ enum power_supply_property psp,
+ union power_supply_propval *val)
+{
+ struct twl6030_charger_info *charger = power_supply_get_drvdata(psy);
+ int ret;
+ u8 stat1;
+
+ ret = twl6030_charger_read(CONTROLLER_STAT1, &stat1);
+ if (ret)
+ return ret;
+
+ switch (psp) {
+ case POWER_SUPPLY_PROP_STATUS:
+ u8 intstat;
+
+ if (!(stat1 & VBUS_DET)) {
+ val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
+ break;
+ }
+ ret = twl6030_charger_read(CHARGERUSB_STATUS_INT2, &intstat);
+ if (ret)
+ return ret;
+
+ if (intstat & CHARGE_DONE)
+ val->intval = POWER_SUPPLY_STATUS_FULL;
+ else if (intstat & CURRENT_TERM)
+ val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
+ else
+ val->intval = POWER_SUPPLY_STATUS_CHARGING;
+ break;
+ case POWER_SUPPLY_PROP_VOLTAGE_NOW:
+ if (!charger->channel_vusb)
+ return -ENODATA;
+
+ ret = iio_read_channel_processed_scale(charger->channel_vusb, &val->intval, 1000);
+ if (ret < 0)
+ return ret;
+
+ break;
+ case POWER_SUPPLY_PROP_ONLINE:
+ val->intval = !!(stat1 & VBUS_DET);
+ break;
+ case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
+ val->intval = charger->input_current_limit;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int twl6030_charger_usb_set_property(struct power_supply *psy,
+ enum power_supply_property psp,
+ const union power_supply_propval *val)
+{
+ struct twl6030_charger_info *charger = power_supply_get_drvdata(psy);
+
+ switch (psp) {
+ case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
+ charger->input_current_limit = val->intval;
+ return twl6030_config_cinlimit_reg(charger, charger->input_current_limit);
+ default:
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int twl6030_charger_usb_property_is_writeable(struct power_supply *psy,
+ enum power_supply_property psp)
+{
+ dev_info(&psy->dev, "is %d writeable?\n", (int)psp);
+ switch (psp) {
+ case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
+ return true;
+ default:
+ return false;
+ }
+}
+
+static enum power_supply_property twl6030_charger_props[] = {
+ POWER_SUPPLY_PROP_STATUS,
+ POWER_SUPPLY_PROP_ONLINE,
+ POWER_SUPPLY_PROP_VOLTAGE_NOW,
+ POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT,
+};
+
+static const struct power_supply_desc twl6030_charger_usb_desc = {
+ .name = "twl6030_usb",
+ .type = POWER_SUPPLY_TYPE_USB,
+ .properties = twl6030_charger_props,
+ .num_properties = ARRAY_SIZE(twl6030_charger_props),
+ .get_property = twl6030_charger_usb_get_property,
+ .set_property = twl6030_charger_usb_set_property,
+ .property_is_writeable = twl6030_charger_usb_property_is_writeable,
+};
+
+static int twl6030_charger_probe(struct platform_device *pdev)
+{
+ struct twl6030_charger_info *charger;
+ struct power_supply_config psy_cfg = {};
+ int ret;
+ u8 val;
+
+ charger = devm_kzalloc(&pdev->dev, sizeof(*charger), GFP_KERNEL);
+ if (!charger)
+ return -ENOMEM;
+
+ charger->dev = &pdev->dev;
+ charger->irq_chg = platform_get_irq(pdev, 0);
+
+ platform_set_drvdata(pdev, charger);
+ psy_cfg.drv_data = charger;
+
+ charger->channel_vusb = devm_iio_channel_get(&pdev->dev, "vusb");
+ if (IS_ERR(charger->channel_vusb)) {
+ ret = PTR_ERR(charger->channel_vusb);
+ if (ret == -EPROBE_DEFER)
+ return ret; /* iio not ready */
+ dev_warn(&pdev->dev, "could not request vusb iio channel (%d)",
+ ret);
+ charger->channel_vusb = NULL;
+ }
+
+ charger->usb = devm_power_supply_register(&pdev->dev,
+ &twl6030_charger_usb_desc,
+ &psy_cfg);
+ if (IS_ERR(charger->usb)) {
+ return dev_err_probe(&pdev->dev, PTR_ERR(charger->usb),
+ "Failed to register usb\n");
+ }
+
+ ret = power_supply_get_battery_info(charger->usb, &charger->binfo);
+ if (ret < 0)
+ return dev_err_probe(&pdev->dev, ret,
+ "Failed to get battery info\n");
+
+ dev_info(&pdev->dev, "battery with vmax %d imax: %d\n",
+ charger->binfo->constant_charge_voltage_max_uv,
+ charger->binfo->constant_charge_current_max_ua);
+
+ if (charger->binfo->constant_charge_voltage_max_uv == -EINVAL) {
+ ret = twl6030_charger_read(CHARGERUSB_CTRLLIMIT1, &val);
+ if (ret < 0)
+ return ret;
+
+ charger->binfo->constant_charge_voltage_max_uv =
+ VOREG_TO_UV(val);
+ }
+
+ if (charger->binfo->constant_charge_voltage_max_uv > 4760000 ||
+ charger->binfo->constant_charge_voltage_max_uv < 350000)
+ return dev_err_probe(&pdev->dev, -EINVAL,
+ "Invalid charge voltage\n");
+
+ if (charger->binfo->constant_charge_current_max_ua == -EINVAL) {
+ ret = twl6030_charger_read(CHARGERUSB_CTRLLIMIT2, &val);
+ if (ret < 0)
+ return ret;
+
+ charger->binfo->constant_charge_current_max_ua = VICHRG_TO_UA(val);
+ }
+
+ if (charger->binfo->constant_charge_current_max_ua < 100000 ||
+ charger->binfo->constant_charge_current_max_ua > 1500000) {
+ return dev_err_probe(&pdev->dev, -EINVAL,
+ "Invalid charge current\n");
+ }
+
+ if ((charger->binfo->charge_term_current_ua != -EINVAL) &&
+ (charger->binfo->charge_term_current_ua > 400000 ||
+ charger->binfo->charge_term_current_ua < 50000)) {
+ return dev_err_probe(&pdev->dev, -EINVAL,
+ "Invalid charge termination current\n");
+ }
+
+ ret = devm_delayed_work_autocancel(&pdev->dev,
+ &charger->charger_monitor,
+ twl6030_charger_wdg);
+ if (ret < 0)
+ return dev_err_probe(&pdev->dev, ret,
+ "Failed to register delayed work\n");
+
+ ret = devm_request_threaded_irq(&pdev->dev, charger->irq_chg, NULL,
+ twl6030_charger_interrupt,
+ IRQF_ONESHOT, pdev->name,
+ charger);
+ if (ret < 0) {
+ return dev_err_probe(&pdev->dev, ret,
+ "could not request irq %d\n",
+ charger->irq_chg);
+ }
+
+ /* turing to charging to configure things */
+ twl6030_charger_write(CONTROLLER_CTRL1, 0);
+ twl6030_charger_interrupt(0, charger);
+
+ return 0;
+}
+
+static const struct of_device_id twl_charger_of_match[] __maybe_unused = {
+ {.compatible = "ti,twl6030-charger", },
+ {.compatible = "ti,twl6032-charger", },
+ { }
+};
+MODULE_DEVICE_TABLE(of, twl_charger_of_match);
+
+static struct platform_driver twl6030_charger_driver = {
+ .probe = twl6030_charger_probe,
+ .driver = {
+ .name = "twl6030_charger",
+ .of_match_table = of_match_ptr(twl_charger_of_match),
+ },
+};
+module_platform_driver(twl6030_charger_driver);
+
+MODULE_DESCRIPTION("TWL6030 Battery Charger Interface driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:twl6030_charger");
Add a driver for the charger in the TWL6030/32. For now it does not report much in sysfs but parameters are set up for USB, charging is enabled with the specified parameters. It stops charging when full and also restarts charging. This prevents ending up in a system setup where you run out of battery although a charger is plugged in after precharge completed. Battery voltage behavior was checked via the GPADC. Signed-off-by: Andreas Kemnade <andreas@kemnade.info> --- drivers/power/supply/Kconfig | 10 + drivers/power/supply/Makefile | 1 + drivers/power/supply/twl6030_charger.c | 566 +++++++++++++++++++++++++ 3 files changed, 577 insertions(+) create mode 100644 drivers/power/supply/twl6030_charger.c