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Message-Id: <20200322224626.13160-5-sravanhome@gmail.com>
Date: Sun, 22 Mar 2020 23:46:25 +0100
From: Saravanan Sekar <sravanhome@...il.com>
To: lee.jones@...aro.org, robh+dt@...nel.org, jic23@...nel.org,
knaack.h@....de, lars@...afoo.de, pmeerw@...erw.net, sre@...nel.org
Cc: devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-iio@...r.kernel.org, linux-pm@...r.kernel.org,
Saravanan Sekar <sravanhome@...il.com>
Subject: [PATCH v4 4/5] power: supply: Add support for mps mp2629 battery charger
The mp2629 provides switching-mode battery charge management for
single-cell Li-ion or Li-polymer battery. Driver supports the
access/control input source and battery charging parameters.
Signed-off-by: Saravanan Sekar <sravanhome@...il.com>
---
drivers/power/supply/Kconfig | 10 +
drivers/power/supply/Makefile | 1 +
drivers/power/supply/mp2629_charger.c | 697 ++++++++++++++++++++++++++
3 files changed, 708 insertions(+)
create mode 100644 drivers/power/supply/mp2629_charger.c
diff --git a/drivers/power/supply/Kconfig b/drivers/power/supply/Kconfig
index f3424fdce341..f45409d26d54 100644
--- a/drivers/power/supply/Kconfig
+++ b/drivers/power/supply/Kconfig
@@ -541,6 +541,16 @@ config CHARGER_MAX8998
Say Y to enable support for the battery charger control sysfs and
platform data of MAX8998/LP3974 PMICs.
+config CHARGER_MP2629
+ bool "Monolithic power system MP2629 Battery charger"
+ depends on MFD_MP2629
+ depends on MP2629_ADC
+ depends on IIO
+ help
+ Select this option to enable support for Monolithic power system
+ Battery charger. This driver provies Battery charger power management
+ functions on the systems.
+
config CHARGER_QCOM_SMBB
tristate "Qualcomm Switch-Mode Battery Charger and Boost"
depends on MFD_SPMI_PMIC || COMPILE_TEST
diff --git a/drivers/power/supply/Makefile b/drivers/power/supply/Makefile
index 6c7da920ea83..41cb64f09e49 100644
--- a/drivers/power/supply/Makefile
+++ b/drivers/power/supply/Makefile
@@ -75,6 +75,7 @@ obj-$(CONFIG_CHARGER_MAX77650) += max77650-charger.o
obj-$(CONFIG_CHARGER_MAX77693) += max77693_charger.o
obj-$(CONFIG_CHARGER_MAX8997) += max8997_charger.o
obj-$(CONFIG_CHARGER_MAX8998) += max8998_charger.o
+obj-$(CONFIG_CHARGER_MP2629) += mp2629_charger.o
obj-$(CONFIG_CHARGER_QCOM_SMBB) += qcom_smbb.o
obj-$(CONFIG_CHARGER_BQ2415X) += bq2415x_charger.o
obj-$(CONFIG_CHARGER_BQ24190) += bq24190_charger.o
diff --git a/drivers/power/supply/mp2629_charger.c b/drivers/power/supply/mp2629_charger.c
new file mode 100644
index 000000000000..62a3ae4d1df8
--- /dev/null
+++ b/drivers/power/supply/mp2629_charger.c
@@ -0,0 +1,697 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * MP2629 battery charger driver
+ *
+ * Copyright 2020 Monolithic Power Systems, Inc
+ *
+ * Author: Saravanan Sekar <sravanhome@...il.com>
+ */
+
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/of_device.h>
+#include <linux/interrupt.h>
+#include <linux/iio/consumer.h>
+#include <linux/iio/types.h>
+#include <linux/power_supply.h>
+#include <linux/workqueue.h>
+#include <linux/regmap.h>
+
+#include <linux/mfd/core.h>
+#include <linux/mfd/mp2629.h>
+
+#define MP2629_REG_INPUT_ILIM 0x00
+#define MP2629_REG_INPUT_VLIM 0x01
+#define MP2629_REG_CHARGE_CTRL 0x04
+#define MP2629_REG_CHARGE_ILIM 0x05
+#define MP2629_REG_PRECHARGE 0x06
+#define MP2629_REG_TERM_CURRENT 0x06
+#define MP2629_REG_CHARGE_VLIM 0x07
+#define MP2629_REG_TIMER_CTRL 0x08
+#define MP2629_REG_IMPEDANCE_COMP 0x09
+#define MP2629_REG_INTERRUPT 0x0b
+#define MP2629_REG_STATUS 0x0c
+#define MP2629_REG_FAULT 0x0d
+
+#define MP2629_MASK_INPUT_TYPE 0xe0
+#define MP2629_MASK_CHARGE_TYPE 0x18
+#define MP2629_MASK_CHARGE_CTRL 0x30
+#define MP2629_MASK_WDOG_CTRL 0x30
+#define MP2629_MASK_IMPEDANCE 0xf0
+
+#define MP2629_INPUTSOURCE_CHANGE GENMASK(7, 5)
+#define MP2629_CHARGING_CHANGE GENMASK(4, 3)
+#define MP2629_FAULT_BATTERY BIT(3)
+#define MP2629_FAULT_THERMAL BIT(4)
+#define MP2629_FAULT_INPUT BIT(5)
+#define MP2629_FAULT_OTG BIT(6)
+
+#define MP2629_MAX_BATT_CAPACITY 100
+
+#define MP2629_PROPS(_idx, _min, _max, _step) \
+ [_idx] = { \
+ .min = _min, \
+ .max = _max, \
+ .step = _step, \
+}
+
+enum mp2629_source_type {
+ MP2629_SOURCE_TYPE_NO_INPUT,
+ MP2629_SOURCE_TYPE_NON_STD,
+ MP2629_SOURCE_TYPE_SDP,
+ MP2629_SOURCE_TYPE_CDP,
+ MP2629_SOURCE_TYPE_DCP,
+ MP2629_SOURCE_TYPE_OTG = 7,
+};
+
+enum mp2629_field {
+ INPUT_ILIM,
+ INPUT_VLIM,
+ CHARGE_ILIM,
+ CHARGE_VLIM,
+ PRECHARGE,
+ TERM_CURRENT,
+};
+
+struct mp2629_charger {
+ struct device *dev;
+ struct work_struct charger_work;
+ int status;
+ int fault;
+ int irq;
+
+ struct regmap *regmap;
+ struct regmap_field *regmap_fields[TERM_CURRENT + 1];
+ struct mutex lock;
+ struct power_supply *usb;
+ struct power_supply *battery;
+ struct iio_channel *iiochan[MP2629_ADC_CHAN_END];
+};
+
+struct mp2629_prop {
+ int reg;
+ int mask;
+ int min;
+ int max;
+ int step;
+ int shift;
+};
+
+static enum power_supply_usb_type mp2629_usb_types[] = {
+ POWER_SUPPLY_USB_TYPE_SDP,
+ POWER_SUPPLY_USB_TYPE_DCP,
+ POWER_SUPPLY_USB_TYPE_CDP,
+ POWER_SUPPLY_USB_TYPE_PD_DRP,
+ POWER_SUPPLY_USB_TYPE_UNKNOWN
+};
+
+static enum power_supply_property mp2629_charger_usb_props[] = {
+ POWER_SUPPLY_PROP_ONLINE,
+ POWER_SUPPLY_PROP_USB_TYPE,
+ POWER_SUPPLY_PROP_VOLTAGE_NOW,
+ POWER_SUPPLY_PROP_CURRENT_NOW,
+ POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT,
+ POWER_SUPPLY_PROP_INPUT_VOLTAGE_LIMIT,
+};
+
+static enum power_supply_property mp2629_charger_bat_props[] = {
+ POWER_SUPPLY_PROP_STATUS,
+ POWER_SUPPLY_PROP_HEALTH,
+ POWER_SUPPLY_PROP_CHARGE_TYPE,
+ POWER_SUPPLY_PROP_VOLTAGE_NOW,
+ POWER_SUPPLY_PROP_CURRENT_NOW,
+ POWER_SUPPLY_PROP_CAPACITY,
+ POWER_SUPPLY_PROP_PRECHARGE_CURRENT,
+ POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT,
+ POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT,
+ POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE,
+ POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX,
+ POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX,
+};
+
+static struct mp2629_prop props[] = {
+ MP2629_PROPS(INPUT_ILIM, 100000, 3250000, 50000),
+ MP2629_PROPS(INPUT_VLIM, 3800000, 5300000, 100000),
+ MP2629_PROPS(CHARGE_ILIM, 320000, 4520000, 40000),
+ MP2629_PROPS(CHARGE_VLIM, 3400000, 4670000, 10000),
+ MP2629_PROPS(PRECHARGE, 120000, 720000, 40000),
+ MP2629_PROPS(TERM_CURRENT, 80000, 680000, 40000),
+};
+
+static const struct reg_field mp2629_reg_fields[] = {
+ [INPUT_ILIM] = REG_FIELD(MP2629_REG_INPUT_ILIM, 0, 5),
+ [INPUT_VLIM] = REG_FIELD(MP2629_REG_INPUT_VLIM, 0, 3),
+ [CHARGE_ILIM] = REG_FIELD(MP2629_REG_CHARGE_ILIM, 0, 6),
+ [CHARGE_VLIM] = REG_FIELD(MP2629_REG_CHARGE_VLIM, 1, 7),
+ [PRECHARGE] = REG_FIELD(MP2629_REG_PRECHARGE, 4, 7),
+ [TERM_CURRENT] = REG_FIELD(MP2629_REG_TERM_CURRENT, 0, 3),
+};
+
+static char *adc_chan_name[] = {
+ "mp2629-batt-volt",
+ "mp2629-system-volt",
+ "mp2629-input-volt",
+ "mp2629-batt-current",
+ "mp2629-input-current",
+};
+
+static int mp2629_read_adc(struct mp2629_charger *charger,
+ enum mp2629_adc_chan ch,
+ union power_supply_propval *val)
+{
+ int ret;
+ int chval;
+
+ ret = iio_read_channel_processed(charger->iiochan[ch], &chval);
+ if (ret < 0)
+ return ret;
+
+ val->intval = chval * 1000;
+
+ return 0;
+}
+
+static int mp2629_get_prop(struct mp2629_charger *charger,
+ enum mp2629_field fld,
+ union power_supply_propval *val)
+{
+ int ret;
+ unsigned int rval;
+
+ ret = regmap_field_read(charger->regmap_fields[fld], &rval);
+ if (!ret)
+ val->intval = (rval * props[fld].step) + props[fld].min;
+
+ return ret;
+}
+
+static int mp2629_set_prop(struct mp2629_charger *charger,
+ enum mp2629_field fld,
+ const union power_supply_propval *val)
+{
+ unsigned int rval;
+
+ if (val->intval < props[fld].min || val->intval > props[fld].max)
+ return -EINVAL;
+
+ rval = (val->intval - props[fld].min) / props[fld].step;
+ return regmap_field_write(charger->regmap_fields[fld], rval);
+}
+
+static int mp2629_get_battery_capacity(struct mp2629_charger *charger,
+ union power_supply_propval *val)
+{
+ union power_supply_propval vnow, vlim;
+ int ret;
+
+ ret = mp2629_read_adc(charger, MP2629_BATT_VOLT, &vnow);
+ if (ret)
+ return ret;
+
+ ret = mp2629_get_prop(charger, CHARGE_VLIM, &vlim);
+ if (ret)
+ return ret;
+
+ val->intval = (vnow.intval * 100) / vlim.intval;
+ val->intval = min(val->intval, MP2629_MAX_BATT_CAPACITY);
+
+ return 0;
+}
+
+static int mp2629_charger_battery_get_prop(struct power_supply *psy,
+ enum power_supply_property psp,
+ union power_supply_propval *val)
+{
+ struct mp2629_charger *charger = dev_get_drvdata(psy->dev.parent);
+ unsigned int rval;
+ int ret = 0;
+
+ switch (psp) {
+ case POWER_SUPPLY_PROP_VOLTAGE_NOW:
+ ret = mp2629_read_adc(charger, MP2629_BATT_VOLT, val);
+ break;
+
+ case POWER_SUPPLY_PROP_CURRENT_NOW:
+ ret = mp2629_read_adc(charger, MP2629_BATT_CURRENT, val);
+ break;
+
+ case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX:
+ val->intval = 4520000;
+ break;
+
+ case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX:
+ val->intval = 4670000;
+ break;
+
+ case POWER_SUPPLY_PROP_CAPACITY:
+ ret = mp2629_get_battery_capacity(charger, val);
+ break;
+
+ case POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT:
+ ret = mp2629_get_prop(charger, TERM_CURRENT, val);
+ break;
+
+ case POWER_SUPPLY_PROP_PRECHARGE_CURRENT:
+ ret = mp2629_get_prop(charger, PRECHARGE, val);
+ break;
+
+ case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
+ ret = mp2629_get_prop(charger, CHARGE_VLIM, val);
+ break;
+
+ case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
+ ret = mp2629_get_prop(charger, CHARGE_ILIM, val);
+ break;
+
+ case POWER_SUPPLY_PROP_HEALTH:
+ if (!charger->fault)
+ val->intval = POWER_SUPPLY_HEALTH_GOOD;
+ if (MP2629_FAULT_BATTERY & charger->fault)
+ val->intval = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
+ else if (MP2629_FAULT_THERMAL & charger->fault)
+ val->intval = POWER_SUPPLY_HEALTH_OVERHEAT;
+ else if (MP2629_FAULT_INPUT & charger->fault)
+ val->intval = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
+ break;
+
+ case POWER_SUPPLY_PROP_STATUS:
+ ret = regmap_read(charger->regmap, MP2629_REG_STATUS, &rval);
+ if (ret)
+ break;
+
+ rval = (rval & MP2629_MASK_CHARGE_TYPE) >> 3;
+ switch (rval) {
+ case 0x00:
+ val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
+ break;
+ case 0x01:
+ case 0x10:
+ val->intval = POWER_SUPPLY_STATUS_CHARGING;
+ break;
+ case 0x11:
+ val->intval = POWER_SUPPLY_STATUS_FULL;
+ }
+ break;
+
+ case POWER_SUPPLY_PROP_CHARGE_TYPE:
+ ret = regmap_read(charger->regmap, MP2629_REG_STATUS, &rval);
+ if (ret)
+ break;
+
+ rval = (rval & MP2629_MASK_CHARGE_TYPE) >> 3;
+ switch (rval) {
+ case 0x00:
+ val->intval = POWER_SUPPLY_CHARGE_TYPE_NONE;
+ break;
+ case 0x01:
+ val->intval = POWER_SUPPLY_CHARGE_TYPE_TRICKLE;
+ break;
+ case 0x10:
+ val->intval = POWER_SUPPLY_CHARGE_TYPE_STANDARD;
+ break;
+ default:
+ val->intval = POWER_SUPPLY_CHARGE_TYPE_UNKNOWN;
+ }
+ break;
+
+ default:
+ return -EINVAL;
+ }
+
+ return ret;
+}
+
+static int mp2629_charger_battery_set_prop(struct power_supply *psy,
+ enum power_supply_property psp,
+ const union power_supply_propval *val)
+{
+ struct mp2629_charger *charger = dev_get_drvdata(psy->dev.parent);
+ int ret;
+
+ switch (psp) {
+ case POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT:
+ ret = mp2629_set_prop(charger, TERM_CURRENT, val);
+ break;
+
+ case POWER_SUPPLY_PROP_PRECHARGE_CURRENT:
+ ret = mp2629_set_prop(charger, PRECHARGE, val);
+ break;
+
+ case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
+ ret = mp2629_set_prop(charger, CHARGE_VLIM, val);
+ break;
+
+ case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
+ ret = mp2629_set_prop(charger, CHARGE_ILIM, val);
+ break;
+
+ default:
+ return -EINVAL;
+ }
+
+ return ret;
+}
+
+static int mp2629_charger_usb_get_prop(struct power_supply *psy,
+ enum power_supply_property psp,
+ union power_supply_propval *val)
+{
+ struct mp2629_charger *charger = dev_get_drvdata(psy->dev.parent);
+ unsigned int rval;
+ int ret;
+
+ switch (psp) {
+ case POWER_SUPPLY_PROP_ONLINE:
+ ret = regmap_read(charger->regmap, MP2629_REG_STATUS, &rval);
+ if (!ret)
+ val->intval = !!(rval & MP2629_MASK_INPUT_TYPE);
+ break;
+
+ case POWER_SUPPLY_PROP_USB_TYPE:
+ ret = regmap_read(charger->regmap, MP2629_REG_STATUS, &rval);
+ if (ret)
+ break;
+
+ rval = (rval & MP2629_MASK_INPUT_TYPE) >> 5;
+ switch (rval) {
+ case MP2629_SOURCE_TYPE_SDP:
+ val->intval = POWER_SUPPLY_USB_TYPE_SDP;
+ break;
+ case MP2629_SOURCE_TYPE_CDP:
+ val->intval = POWER_SUPPLY_USB_TYPE_CDP;
+ break;
+ case MP2629_SOURCE_TYPE_DCP:
+ val->intval = POWER_SUPPLY_USB_TYPE_DCP;
+ break;
+ case MP2629_SOURCE_TYPE_OTG:
+ val->intval = POWER_SUPPLY_USB_TYPE_PD_DRP;
+ break;
+ default:
+ val->intval = POWER_SUPPLY_USB_TYPE_UNKNOWN;
+ break;
+ }
+ break;
+
+ case POWER_SUPPLY_PROP_VOLTAGE_NOW:
+ ret = mp2629_read_adc(charger, MP2629_INPUT_VOLT, val);
+ break;
+
+ case POWER_SUPPLY_PROP_CURRENT_NOW:
+ ret = mp2629_read_adc(charger, MP2629_INPUT_CURRENT, val);
+ break;
+
+ case POWER_SUPPLY_PROP_INPUT_VOLTAGE_LIMIT:
+ ret = mp2629_get_prop(charger, INPUT_VLIM, val);
+ break;
+
+ case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
+ ret = mp2629_get_prop(charger, INPUT_ILIM, val);
+ break;
+
+ default:
+ return -EINVAL;
+ }
+
+ return ret;
+}
+
+static int mp2629_charger_usb_set_prop(struct power_supply *psy,
+ enum power_supply_property psp,
+ const union power_supply_propval *val)
+{
+ struct mp2629_charger *charger = dev_get_drvdata(psy->dev.parent);
+ int ret;
+
+ switch (psp) {
+ case POWER_SUPPLY_PROP_INPUT_VOLTAGE_LIMIT:
+ ret = mp2629_set_prop(charger, INPUT_VLIM, val);
+ break;
+
+ case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
+ ret = mp2629_set_prop(charger, INPUT_ILIM, val);
+ break;
+
+ default:
+ return -EINVAL;
+ }
+
+ return ret;
+}
+
+static int mp2629_charger_battery_prop_writeable(struct power_supply *psy,
+ enum power_supply_property psp)
+{
+ return (psp == POWER_SUPPLY_PROP_PRECHARGE_CURRENT ||
+ psp == POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT ||
+ psp == POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT ||
+ psp == POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE);
+}
+
+static int mp2629_charger_usb_prop_writeable(struct power_supply *psy,
+ enum power_supply_property psp)
+{
+ return (psp == POWER_SUPPLY_PROP_INPUT_VOLTAGE_LIMIT ||
+ psp == POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT);
+}
+
+static void mp2629_charger_work(struct work_struct *work)
+{
+ struct mp2629_charger *charger;
+ unsigned int rval;
+ int ret;
+
+ charger = container_of(work, struct mp2629_charger, charger_work);
+
+ mutex_lock(&charger->lock);
+
+ ret = regmap_read(charger->regmap, MP2629_REG_FAULT, &rval);
+ if (ret)
+ goto unlock;
+
+ if (rval) {
+ charger->fault = rval;
+ if (MP2629_FAULT_BATTERY & rval)
+ dev_err(charger->dev, "Battery fault OVP");
+ else if (MP2629_FAULT_THERMAL & rval)
+ dev_err(charger->dev, "Thermal shutdown fault");
+ else if (MP2629_FAULT_INPUT & rval)
+ dev_err(charger->dev, "no input or input OVP");
+ else if (MP2629_FAULT_OTG & rval)
+ dev_err(charger->dev, "VIN overloaded");
+
+ goto unlock;
+ }
+
+ ret = regmap_read(charger->regmap, MP2629_REG_STATUS, &rval);
+ if (ret)
+ goto unlock;
+
+ if (rval & MP2629_INPUTSOURCE_CHANGE)
+ power_supply_changed(charger->usb);
+ else if (rval & MP2629_CHARGING_CHANGE)
+ power_supply_changed(charger->battery);
+
+unlock:
+ mutex_unlock(&charger->lock);
+}
+
+static irqreturn_t mp2629_irq_handler(int irq, void *dev_id)
+{
+ struct mp2629_charger *charger = dev_id;
+
+ schedule_work(&charger->charger_work);
+ return IRQ_HANDLED;
+}
+
+static const struct power_supply_desc mp2629_usb_desc = {
+ .name = "mp2629_usb",
+ .type = POWER_SUPPLY_TYPE_USB,
+ .usb_types = mp2629_usb_types,
+ .num_usb_types = ARRAY_SIZE(mp2629_usb_types),
+ .properties = mp2629_charger_usb_props,
+ .num_properties = ARRAY_SIZE(mp2629_charger_usb_props),
+ .get_property = mp2629_charger_usb_get_prop,
+ .set_property = mp2629_charger_usb_set_prop,
+ .property_is_writeable = mp2629_charger_usb_prop_writeable,
+};
+
+static const struct power_supply_desc mp2629_battery_desc = {
+ .name = "mp2629_battery",
+ .type = POWER_SUPPLY_TYPE_BATTERY,
+ .properties = mp2629_charger_bat_props,
+ .num_properties = ARRAY_SIZE(mp2629_charger_bat_props),
+ .get_property = mp2629_charger_battery_get_prop,
+ .set_property = mp2629_charger_battery_set_prop,
+ .property_is_writeable = mp2629_charger_battery_prop_writeable,
+};
+
+static ssize_t batt_impedance_compensation_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct mp2629_charger *charger = dev_get_drvdata(dev->parent);
+ unsigned int rval;
+ int ret;
+
+ ret = regmap_read(charger->regmap, MP2629_REG_IMPEDANCE_COMP, &rval);
+ if (ret < 0)
+ return ret;
+
+ rval = (rval >> 4) * 10;
+
+ return scnprintf(buf, PAGE_SIZE, "%d mohm\n", rval);
+}
+
+static ssize_t batt_impedance_compensation_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf,
+ size_t count)
+{
+ struct mp2629_charger *charger = dev_get_drvdata(dev->parent);
+ long val;
+ int ret;
+
+ ret = kstrtol(buf, 10, &val);
+ if (ret < 0)
+ return ret;
+
+ if (val < 0 && val > 140)
+ return -ERANGE;
+
+ /* multiples of 10 mohm so round off */
+ val = val / 10;
+ ret = regmap_update_bits(charger->regmap, MP2629_REG_IMPEDANCE_COMP,
+ MP2629_MASK_IMPEDANCE, val << 4);
+ if (ret < 0)
+ return ret;
+
+ return count;
+}
+
+static DEVICE_ATTR_RW(batt_impedance_compensation);
+
+static struct attribute *mp2629_charger_sysfs_attrs[] = {
+ &dev_attr_batt_impedance_compensation.attr,
+ NULL
+};
+ATTRIBUTE_GROUPS(mp2629_charger_sysfs);
+
+static int mp2629_charger_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ void **pdata = pdev->dev.platform_data;
+ struct mp2629_charger *charger;
+ struct power_supply_config psy_cfg = {0};
+ int ret, i;
+
+ charger = devm_kzalloc(dev, sizeof(*charger), GFP_KERNEL);
+ if (!charger)
+ return -ENOMEM;
+
+ charger->regmap = *pdata;
+ charger->dev = dev;
+ charger->irq = platform_get_irq(pdev, 0);
+ platform_set_drvdata(pdev, charger);
+
+ for (i = 0; i <= TERM_CURRENT; i++) {
+ charger->regmap_fields[i] = devm_regmap_field_alloc(dev,
+ charger->regmap, mp2629_reg_fields[i]);
+ if (IS_ERR(charger->regmap_fields[i])) {
+ dev_err(dev, "regmap field alloc fail %d\n", i);
+ return PTR_ERR(charger->regmap_fields[i]);
+ }
+ }
+
+ for (i = 0; i < MP2629_ADC_CHAN_END; i++) {
+ charger->iiochan[i] = iio_channel_get(dev, adc_chan_name[i]);
+ if (IS_ERR(charger->iiochan[i])) {
+ ret = PTR_ERR(charger->iiochan[i]);
+ goto iio_fail;
+ }
+ }
+
+ charger->usb = devm_power_supply_register(dev, &mp2629_usb_desc, NULL);
+ if (IS_ERR(charger->usb)) {
+ ret = PTR_ERR(charger->usb);
+ goto iio_fail;
+ }
+
+ psy_cfg.drv_data = charger;
+ psy_cfg.attr_grp = mp2629_charger_sysfs_groups;
+ charger->battery = devm_power_supply_register(dev,
+ &mp2629_battery_desc, &psy_cfg);
+ if (IS_ERR(charger->battery)) {
+ ret = PTR_ERR(charger->battery);
+ goto iio_fail;
+ }
+
+ ret = regmap_update_bits(charger->regmap, MP2629_REG_CHARGE_CTRL,
+ MP2629_MASK_CHARGE_CTRL, BIT(4));
+ if (ret) {
+ dev_err(dev, "enable charge fail: %d\n", ret);
+ goto iio_fail;
+ }
+
+ regmap_update_bits(charger->regmap, MP2629_REG_TIMER_CTRL,
+ MP2629_MASK_WDOG_CTRL, 0);
+
+ INIT_WORK(&charger->charger_work, mp2629_charger_work);
+ mutex_init(&charger->lock);
+
+ if (charger->irq) {
+ ret = devm_request_irq(dev, charger->irq, mp2629_irq_handler,
+ IRQF_TRIGGER_RISING, "mp2629-charger",
+ charger);
+ if (ret) {
+ dev_err(dev, "failed to request gpio IRQ\n");
+ goto iio_fail;
+ }
+ }
+
+ regmap_update_bits(charger->regmap, MP2629_REG_INTERRUPT,
+ GENMASK(6, 5), (BIT(6) | BIT(5)));
+
+ return 0;
+
+iio_fail:
+ while (i--)
+ iio_channel_release(charger->iiochan[i]);
+
+ dev_err(dev, "driver register fail: %d\n", ret);
+ return ret;
+}
+
+static int mp2629_charger_remove(struct platform_device *pdev)
+{
+ struct mp2629_charger *charger = platform_get_drvdata(pdev);
+ int i;
+
+ cancel_work_sync(&charger->charger_work);
+
+ for (i = 0; i < MP2629_ADC_CHAN_END; i++)
+ iio_channel_release(charger->iiochan[i]);
+
+ regmap_update_bits(charger->regmap, MP2629_REG_CHARGE_CTRL,
+ MP2629_MASK_CHARGE_CTRL, 0);
+ return 0;
+}
+
+static const struct of_device_id mp2629_charger_of_match[] = {
+ { .compatible = "mps,mp2629_charger"},
+ {}
+};
+MODULE_DEVICE_TABLE(of, mp2629_charger_of_match);
+
+static struct platform_driver mp2629_charger_driver = {
+ .driver = {
+ .name = "mp2629_charger",
+ .of_match_table = mp2629_charger_of_match,
+ },
+ .probe = mp2629_charger_probe,
+ .remove = mp2629_charger_remove,
+};
+module_platform_driver(mp2629_charger_driver);
+
+MODULE_AUTHOR("Saravanan Sekar <sravanhome@...il.com>");
+MODULE_DESCRIPTION("MP2629 Charger driver");
+MODULE_LICENSE("GPL");
--
2.17.1
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