Adding upstream version 6.1.76.upstream/6.1.76upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 741 insertions, 0 deletions

diff --git a/drivers/power/supply/lp8788-charger.c b/drivers/power/supply/lp8788-charger.c
new file mode 100644
index 000000000..56c57529c
--- /dev/null
+++ b/drivers/power/supply/lp8788-charger.c
@@ -0,0 +1,741 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * TI LP8788 MFD - battery charger driver
+ *
+ * Copyright 2012 Texas Instruments
+ *
+ * Author: Milo(Woogyom) Kim <milo.kim@ti.com>
+ */
+
+#include <linux/err.h>
+#include <linux/iio/consumer.h>
+#include <linux/interrupt.h>
+#include <linux/irqdomain.h>
+#include <linux/mfd/lp8788.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/power_supply.h>
+#include <linux/slab.h>
+#include <linux/workqueue.h>
+
+/* register address */
+#define LP8788_CHG_STATUS		0x07
+#define LP8788_CHG_IDCIN		0x13
+#define LP8788_CHG_IBATT		0x14
+#define LP8788_CHG_VTERM		0x15
+#define LP8788_CHG_EOC			0x16
+
+/* mask/shift bits */
+#define LP8788_CHG_INPUT_STATE_M	0x03	/* Addr 07h */
+#define LP8788_CHG_STATE_M		0x3C
+#define LP8788_CHG_STATE_S		2
+#define LP8788_NO_BATT_M		BIT(6)
+#define LP8788_BAD_BATT_M		BIT(7)
+#define LP8788_CHG_IBATT_M		0x1F	/* Addr 14h */
+#define LP8788_CHG_VTERM_M		0x0F	/* Addr 15h */
+#define LP8788_CHG_EOC_LEVEL_M		0x30	/* Addr 16h */
+#define LP8788_CHG_EOC_LEVEL_S		4
+#define LP8788_CHG_EOC_TIME_M		0x0E
+#define LP8788_CHG_EOC_TIME_S		1
+#define LP8788_CHG_EOC_MODE_M		BIT(0)
+
+#define LP8788_CHARGER_NAME		"charger"
+#define LP8788_BATTERY_NAME		"main_batt"
+
+#define LP8788_CHG_START		0x11
+#define LP8788_CHG_END			0x1C
+
+#define LP8788_ISEL_MAX			23
+#define LP8788_ISEL_STEP		50
+#define LP8788_VTERM_MIN		4100
+#define LP8788_VTERM_STEP		25
+#define LP8788_MAX_BATT_CAPACITY	100
+#define LP8788_MAX_CHG_IRQS		11
+
+enum lp8788_charging_state {
+	LP8788_OFF,
+	LP8788_WARM_UP,
+	LP8788_LOW_INPUT = 0x3,
+	LP8788_PRECHARGE,
+	LP8788_CC,
+	LP8788_CV,
+	LP8788_MAINTENANCE,
+	LP8788_BATTERY_FAULT,
+	LP8788_SYSTEM_SUPPORT = 0xC,
+	LP8788_HIGH_CURRENT = 0xF,
+	LP8788_MAX_CHG_STATE,
+};
+
+enum lp8788_charger_adc_sel {
+	LP8788_VBATT,
+	LP8788_BATT_TEMP,
+	LP8788_NUM_CHG_ADC,
+};
+
+enum lp8788_charger_input_state {
+	LP8788_SYSTEM_SUPPLY = 1,
+	LP8788_FULL_FUNCTION,
+};
+
+/*
+ * struct lp8788_chg_irq
+ * @which        : lp8788 interrupt id
+ * @virq         : Linux IRQ number from irq_domain
+ */
+struct lp8788_chg_irq {
+	enum lp8788_int_id which;
+	int virq;
+};
+
+/*
+ * struct lp8788_charger
+ * @lp           : used for accessing the registers of mfd lp8788 device
+ * @charger      : power supply driver for the battery charger
+ * @battery      : power supply driver for the battery
+ * @charger_work : work queue for charger input interrupts
+ * @chan         : iio channels for getting adc values
+ *                 eg) battery voltage, capacity and temperature
+ * @irqs         : charger dedicated interrupts
+ * @num_irqs     : total numbers of charger interrupts
+ * @pdata        : charger platform specific data
+ */
+struct lp8788_charger {
+	struct lp8788 *lp;
+	struct power_supply *charger;
+	struct power_supply *battery;
+	struct work_struct charger_work;
+	struct iio_channel *chan[LP8788_NUM_CHG_ADC];
+	struct lp8788_chg_irq irqs[LP8788_MAX_CHG_IRQS];
+	int num_irqs;
+	struct lp8788_charger_platform_data *pdata;
+};
+
+static char *battery_supplied_to[] = {
+	LP8788_BATTERY_NAME,
+};
+
+static enum power_supply_property lp8788_charger_prop[] = {
+	POWER_SUPPLY_PROP_ONLINE,
+	POWER_SUPPLY_PROP_CURRENT_MAX,
+};
+
+static enum power_supply_property lp8788_battery_prop[] = {
+	POWER_SUPPLY_PROP_STATUS,
+	POWER_SUPPLY_PROP_HEALTH,
+	POWER_SUPPLY_PROP_PRESENT,
+	POWER_SUPPLY_PROP_VOLTAGE_NOW,
+	POWER_SUPPLY_PROP_CAPACITY,
+	POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT,
+	POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX,
+	POWER_SUPPLY_PROP_TEMP,
+};
+
+static bool lp8788_is_charger_detected(struct lp8788_charger *pchg)
+{
+	u8 data;
+
+	lp8788_read_byte(pchg->lp, LP8788_CHG_STATUS, &data);
+	data &= LP8788_CHG_INPUT_STATE_M;
+
+	return data == LP8788_SYSTEM_SUPPLY || data == LP8788_FULL_FUNCTION;
+}
+
+static int lp8788_charger_get_property(struct power_supply *psy,
+					enum power_supply_property psp,
+					union power_supply_propval *val)
+{
+	struct lp8788_charger *pchg = dev_get_drvdata(psy->dev.parent);
+	u8 read;
+
+	switch (psp) {
+	case POWER_SUPPLY_PROP_ONLINE:
+		val->intval = lp8788_is_charger_detected(pchg);
+		break;
+	case POWER_SUPPLY_PROP_CURRENT_MAX:
+		lp8788_read_byte(pchg->lp, LP8788_CHG_IDCIN, &read);
+		val->intval = LP8788_ISEL_STEP *
+				(min_t(int, read, LP8788_ISEL_MAX) + 1);
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int lp8788_get_battery_status(struct lp8788_charger *pchg,
+				union power_supply_propval *val)
+{
+	enum lp8788_charging_state state;
+	u8 data;
+	int ret;
+
+	ret = lp8788_read_byte(pchg->lp, LP8788_CHG_STATUS, &data);
+	if (ret)
+		return ret;
+
+	state = (data & LP8788_CHG_STATE_M) >> LP8788_CHG_STATE_S;
+	switch (state) {
+	case LP8788_OFF:
+		val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
+		break;
+	case LP8788_PRECHARGE:
+	case LP8788_CC:
+	case LP8788_CV:
+	case LP8788_HIGH_CURRENT:
+		val->intval = POWER_SUPPLY_STATUS_CHARGING;
+		break;
+	case LP8788_MAINTENANCE:
+		val->intval = POWER_SUPPLY_STATUS_FULL;
+		break;
+	default:
+		val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
+		break;
+	}
+
+	return 0;
+}
+
+static int lp8788_get_battery_health(struct lp8788_charger *pchg,
+				union power_supply_propval *val)
+{
+	u8 data;
+	int ret;
+
+	ret = lp8788_read_byte(pchg->lp, LP8788_CHG_STATUS, &data);
+	if (ret)
+		return ret;
+
+	if (data & LP8788_NO_BATT_M)
+		val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
+	else if (data & LP8788_BAD_BATT_M)
+		val->intval = POWER_SUPPLY_HEALTH_DEAD;
+	else
+		val->intval = POWER_SUPPLY_HEALTH_GOOD;
+
+	return 0;
+}
+
+static int lp8788_get_battery_present(struct lp8788_charger *pchg,
+				union power_supply_propval *val)
+{
+	u8 data;
+	int ret;
+
+	ret = lp8788_read_byte(pchg->lp, LP8788_CHG_STATUS, &data);
+	if (ret)
+		return ret;
+
+	val->intval = !(data & LP8788_NO_BATT_M);
+	return 0;
+}
+
+static int lp8788_get_vbatt_adc(struct lp8788_charger *pchg, int *result)
+{
+	struct iio_channel *channel = pchg->chan[LP8788_VBATT];
+
+	if (!channel)
+		return -EINVAL;
+
+	return iio_read_channel_processed(channel, result);
+}
+
+static int lp8788_get_battery_voltage(struct lp8788_charger *pchg,
+				union power_supply_propval *val)
+{
+	return lp8788_get_vbatt_adc(pchg, &val->intval);
+}
+
+static int lp8788_get_battery_capacity(struct lp8788_charger *pchg,
+				union power_supply_propval *val)
+{
+	struct lp8788 *lp = pchg->lp;
+	struct lp8788_charger_platform_data *pdata = pchg->pdata;
+	unsigned int max_vbatt;
+	int vbatt;
+	enum lp8788_charging_state state;
+	u8 data;
+	int ret;
+
+	if (!pdata)
+		return -EINVAL;
+
+	max_vbatt = pdata->max_vbatt_mv;
+	if (max_vbatt == 0)
+		return -EINVAL;
+
+	ret = lp8788_read_byte(lp, LP8788_CHG_STATUS, &data);
+	if (ret)
+		return ret;
+
+	state = (data & LP8788_CHG_STATE_M) >> LP8788_CHG_STATE_S;
+
+	if (state == LP8788_MAINTENANCE) {
+		val->intval = LP8788_MAX_BATT_CAPACITY;
+	} else {
+		ret = lp8788_get_vbatt_adc(pchg, &vbatt);
+		if (ret)
+			return ret;
+
+		val->intval = (vbatt * LP8788_MAX_BATT_CAPACITY) / max_vbatt;
+		val->intval = min(val->intval, LP8788_MAX_BATT_CAPACITY);
+	}
+
+	return 0;
+}
+
+static int lp8788_get_battery_temperature(struct lp8788_charger *pchg,
+				union power_supply_propval *val)
+{
+	struct iio_channel *channel = pchg->chan[LP8788_BATT_TEMP];
+	int result;
+	int ret;
+
+	if (!channel)
+		return -EINVAL;
+
+	ret = iio_read_channel_processed(channel, &result);
+	if (ret < 0)
+		return -EINVAL;
+
+	/* unit: 0.1 'C */
+	val->intval = result * 10;
+
+	return 0;
+}
+
+static int lp8788_get_battery_charging_current(struct lp8788_charger *pchg,
+				union power_supply_propval *val)
+{
+	u8 read;
+
+	lp8788_read_byte(pchg->lp, LP8788_CHG_IBATT, &read);
+	read &= LP8788_CHG_IBATT_M;
+	val->intval = LP8788_ISEL_STEP *
+			(min_t(int, read, LP8788_ISEL_MAX) + 1);
+
+	return 0;
+}
+
+static int lp8788_get_charging_termination_voltage(struct lp8788_charger *pchg,
+				union power_supply_propval *val)
+{
+	u8 read;
+
+	lp8788_read_byte(pchg->lp, LP8788_CHG_VTERM, &read);
+	read &= LP8788_CHG_VTERM_M;
+	val->intval = LP8788_VTERM_MIN + LP8788_VTERM_STEP * read;
+
+	return 0;
+}
+
+static int lp8788_battery_get_property(struct power_supply *psy,
+					enum power_supply_property psp,
+					union power_supply_propval *val)
+{
+	struct lp8788_charger *pchg = dev_get_drvdata(psy->dev.parent);
+
+	switch (psp) {
+	case POWER_SUPPLY_PROP_STATUS:
+		return lp8788_get_battery_status(pchg, val);
+	case POWER_SUPPLY_PROP_HEALTH:
+		return lp8788_get_battery_health(pchg, val);
+	case POWER_SUPPLY_PROP_PRESENT:
+		return lp8788_get_battery_present(pchg, val);
+	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
+		return lp8788_get_battery_voltage(pchg, val);
+	case POWER_SUPPLY_PROP_CAPACITY:
+		return lp8788_get_battery_capacity(pchg, val);
+	case POWER_SUPPLY_PROP_TEMP:
+		return lp8788_get_battery_temperature(pchg, val);
+	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
+		return lp8788_get_battery_charging_current(pchg, val);
+	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX:
+		return lp8788_get_charging_termination_voltage(pchg, val);
+	default:
+		return -EINVAL;
+	}
+}
+
+static inline bool lp8788_is_valid_charger_register(u8 addr)
+{
+	return addr >= LP8788_CHG_START && addr <= LP8788_CHG_END;
+}
+
+static int lp8788_update_charger_params(struct platform_device *pdev,
+					struct lp8788_charger *pchg)
+{
+	struct lp8788 *lp = pchg->lp;
+	struct lp8788_charger_platform_data *pdata = pchg->pdata;
+	struct lp8788_chg_param *param;
+	int i;
+	int ret;
+
+	if (!pdata || !pdata->chg_params) {
+		dev_info(&pdev->dev, "skip updating charger parameters\n");
+		return 0;
+	}
+
+	/* setting charging parameters */
+	for (i = 0; i < pdata->num_chg_params; i++) {
+		param = pdata->chg_params + i;
+
+		if (lp8788_is_valid_charger_register(param->addr)) {
+			ret = lp8788_write_byte(lp, param->addr, param->val);
+			if (ret)
+				return ret;
+		}
+	}
+
+	return 0;
+}
+
+static const struct power_supply_desc lp8788_psy_charger_desc = {
+	.name		= LP8788_CHARGER_NAME,
+	.type		= POWER_SUPPLY_TYPE_MAINS,
+	.properties	= lp8788_charger_prop,
+	.num_properties	= ARRAY_SIZE(lp8788_charger_prop),
+	.get_property	= lp8788_charger_get_property,
+};
+
+static const struct power_supply_desc lp8788_psy_battery_desc = {
+	.name		= LP8788_BATTERY_NAME,
+	.type		= POWER_SUPPLY_TYPE_BATTERY,
+	.properties	= lp8788_battery_prop,
+	.num_properties	= ARRAY_SIZE(lp8788_battery_prop),
+	.get_property	= lp8788_battery_get_property,
+};
+
+static void lp8788_psy_unregister(struct lp8788_charger *pchg)
+{
+	power_supply_unregister(pchg->battery);
+	power_supply_unregister(pchg->charger);
+}
+
+static void lp8788_charger_event(struct work_struct *work)
+{
+	struct lp8788_charger *pchg =
+		container_of(work, struct lp8788_charger, charger_work);
+	struct lp8788_charger_platform_data *pdata = pchg->pdata;
+	enum lp8788_charger_event event = lp8788_is_charger_detected(pchg);
+
+	pdata->charger_event(pchg->lp, event);
+}
+
+static bool lp8788_find_irq_id(struct lp8788_charger *pchg, int virq, int *id)
+{
+	bool found = false;
+	int i;
+
+	for (i = 0; i < pchg->num_irqs; i++) {
+		if (pchg->irqs[i].virq == virq) {
+			*id = pchg->irqs[i].which;
+			found = true;
+			break;
+		}
+	}
+
+	return found;
+}
+
+static irqreturn_t lp8788_charger_irq_thread(int virq, void *ptr)
+{
+	struct lp8788_charger *pchg = ptr;
+	struct lp8788_charger_platform_data *pdata = pchg->pdata;
+	int id = -1;
+
+	if (!lp8788_find_irq_id(pchg, virq, &id))
+		return IRQ_NONE;
+
+	switch (id) {
+	case LP8788_INT_CHG_INPUT_STATE:
+	case LP8788_INT_CHG_STATE:
+	case LP8788_INT_EOC:
+	case LP8788_INT_BATT_LOW:
+	case LP8788_INT_NO_BATT:
+		power_supply_changed(pchg->charger);
+		power_supply_changed(pchg->battery);
+		break;
+	default:
+		break;
+	}
+
+	/* report charger dectection event if used */
+	if (!pdata)
+		goto irq_handled;
+
+	if (pdata->charger_event && id == LP8788_INT_CHG_INPUT_STATE)
+		schedule_work(&pchg->charger_work);
+
+irq_handled:
+	return IRQ_HANDLED;
+}
+
+static int lp8788_set_irqs(struct platform_device *pdev,
+			struct lp8788_charger *pchg, const char *name)
+{
+	struct resource *r;
+	struct irq_domain *irqdm = pchg->lp->irqdm;
+	int irq_start;
+	int irq_end;
+	int virq;
+	int nr_irq;
+	int i;
+	int ret;
+
+	/* no error even if no irq resource */
+	r = platform_get_resource_byname(pdev, IORESOURCE_IRQ, name);
+	if (!r)
+		return 0;
+
+	irq_start = r->start;
+	irq_end = r->end;
+
+	for (i = irq_start; i <= irq_end; i++) {
+		nr_irq = pchg->num_irqs;
+
+		virq = irq_create_mapping(irqdm, i);
+		pchg->irqs[nr_irq].virq = virq;
+		pchg->irqs[nr_irq].which = i;
+		pchg->num_irqs++;
+
+		ret = request_threaded_irq(virq, NULL,
+					lp8788_charger_irq_thread,
+					IRQF_ONESHOT, name, pchg);
+		if (ret)
+			break;
+	}
+
+	if (i <= irq_end)
+		goto err_free_irq;
+
+	return 0;
+
+err_free_irq:
+	for (i = 0; i < pchg->num_irqs; i++)
+		free_irq(pchg->irqs[i].virq, pchg);
+	return ret;
+}
+
+static int lp8788_irq_register(struct platform_device *pdev,
+				struct lp8788_charger *pchg)
+{
+	const char *name[] = {
+		LP8788_CHG_IRQ, LP8788_PRSW_IRQ, LP8788_BATT_IRQ
+	};
+	int i;
+	int ret;
+
+	INIT_WORK(&pchg->charger_work, lp8788_charger_event);
+	pchg->num_irqs = 0;
+
+	for (i = 0; i < ARRAY_SIZE(name); i++) {
+		ret = lp8788_set_irqs(pdev, pchg, name[i]);
+		if (ret) {
+			dev_warn(&pdev->dev, "irq setup failed: %s\n", name[i]);
+			return ret;
+		}
+	}
+
+	if (pchg->num_irqs > LP8788_MAX_CHG_IRQS) {
+		dev_err(&pdev->dev, "invalid total number of irqs: %d\n",
+			pchg->num_irqs);
+		return -EINVAL;
+	}
+
+
+	return 0;
+}
+
+static void lp8788_irq_unregister(struct platform_device *pdev,
+				  struct lp8788_charger *pchg)
+{
+	int i;
+	int irq;
+
+	for (i = 0; i < pchg->num_irqs; i++) {
+		irq = pchg->irqs[i].virq;
+		if (!irq)
+			continue;
+
+		free_irq(irq, pchg);
+	}
+}
+
+static void lp8788_setup_adc_channel(struct device *dev,
+				struct lp8788_charger *pchg)
+{
+	struct lp8788_charger_platform_data *pdata = pchg->pdata;
+	struct iio_channel *chan;
+
+	if (!pdata)
+		return;
+
+	/* ADC channel for battery voltage */
+	chan = devm_iio_channel_get(dev, pdata->adc_vbatt);
+	pchg->chan[LP8788_VBATT] = IS_ERR(chan) ? NULL : chan;
+
+	/* ADC channel for battery temperature */
+	chan = devm_iio_channel_get(dev, pdata->adc_batt_temp);
+	pchg->chan[LP8788_BATT_TEMP] = IS_ERR(chan) ? NULL : chan;
+}
+
+static ssize_t lp8788_show_charger_status(struct device *dev,
+				struct device_attribute *attr, char *buf)
+{
+	struct lp8788_charger *pchg = dev_get_drvdata(dev);
+	enum lp8788_charging_state state;
+	static const char * const desc[LP8788_MAX_CHG_STATE] = {
+		[LP8788_OFF] = "CHARGER OFF",
+		[LP8788_WARM_UP] = "WARM UP",
+		[LP8788_LOW_INPUT] = "LOW INPUT STATE",
+		[LP8788_PRECHARGE] = "CHARGING - PRECHARGE",
+		[LP8788_CC] = "CHARGING - CC",
+		[LP8788_CV] = "CHARGING - CV",
+		[LP8788_MAINTENANCE] = "NO CHARGING - MAINTENANCE",
+		[LP8788_BATTERY_FAULT] = "BATTERY FAULT",
+		[LP8788_SYSTEM_SUPPORT] = "SYSTEM SUPPORT",
+		[LP8788_HIGH_CURRENT] = "HIGH CURRENT",
+	};
+	u8 data;
+
+	lp8788_read_byte(pchg->lp, LP8788_CHG_STATUS, &data);
+	state = (data & LP8788_CHG_STATE_M) >> LP8788_CHG_STATE_S;
+
+	return scnprintf(buf, PAGE_SIZE, "%s\n", desc[state]);
+}
+
+static ssize_t lp8788_show_eoc_time(struct device *dev,
+				struct device_attribute *attr, char *buf)
+{
+	struct lp8788_charger *pchg = dev_get_drvdata(dev);
+	static const char * const stime[] = {
+		"400ms", "5min", "10min", "15min",
+		"20min", "25min", "30min", "No timeout"
+	};
+	u8 val;
+
+	lp8788_read_byte(pchg->lp, LP8788_CHG_EOC, &val);
+	val = (val & LP8788_CHG_EOC_TIME_M) >> LP8788_CHG_EOC_TIME_S;
+
+	return scnprintf(buf, PAGE_SIZE, "End Of Charge Time: %s\n",
+			stime[val]);
+}
+
+static ssize_t lp8788_show_eoc_level(struct device *dev,
+				struct device_attribute *attr, char *buf)
+{
+	struct lp8788_charger *pchg = dev_get_drvdata(dev);
+	static const char * const abs_level[] = {
+			"25mA", "49mA", "75mA", "98mA"
+	};
+	static const char * const relative_level[] = {
+			"5%", "10%", "15%", "20%"
+	};
+	const char *level;
+	u8 val;
+	u8 mode;
+
+	lp8788_read_byte(pchg->lp, LP8788_CHG_EOC, &val);
+
+	mode = val & LP8788_CHG_EOC_MODE_M;
+	val = (val & LP8788_CHG_EOC_LEVEL_M) >> LP8788_CHG_EOC_LEVEL_S;
+	level = mode ? abs_level[val] : relative_level[val];
+
+	return scnprintf(buf, PAGE_SIZE, "End Of Charge Level: %s\n", level);
+}
+
+static DEVICE_ATTR(charger_status, S_IRUSR, lp8788_show_charger_status, NULL);
+static DEVICE_ATTR(eoc_time, S_IRUSR, lp8788_show_eoc_time, NULL);
+static DEVICE_ATTR(eoc_level, S_IRUSR, lp8788_show_eoc_level, NULL);
+
+static struct attribute *lp8788_charger_sysfs_attrs[] = {
+	&dev_attr_charger_status.attr,
+	&dev_attr_eoc_time.attr,
+	&dev_attr_eoc_level.attr,
+	NULL,
+};
+
+ATTRIBUTE_GROUPS(lp8788_charger_sysfs);
+
+static int lp8788_psy_register(struct platform_device *pdev,
+				struct lp8788_charger *pchg)
+{
+	struct power_supply_config charger_cfg = {};
+
+	charger_cfg.attr_grp = lp8788_charger_sysfs_groups;
+	charger_cfg.supplied_to = battery_supplied_to;
+	charger_cfg.num_supplicants = ARRAY_SIZE(battery_supplied_to);
+
+	pchg->charger = power_supply_register(&pdev->dev,
+					      &lp8788_psy_charger_desc,
+					      &charger_cfg);
+	if (IS_ERR(pchg->charger))
+		return -EPERM;
+
+	pchg->battery = power_supply_register(&pdev->dev,
+					      &lp8788_psy_battery_desc, NULL);
+	if (IS_ERR(pchg->battery)) {
+		power_supply_unregister(pchg->charger);
+		return -EPERM;
+	}
+
+	return 0;
+}
+
+static int lp8788_charger_probe(struct platform_device *pdev)
+{
+	struct lp8788 *lp = dev_get_drvdata(pdev->dev.parent);
+	struct lp8788_charger *pchg;
+	struct device *dev = &pdev->dev;
+	int ret;
+
+	pchg = devm_kzalloc(dev, sizeof(struct lp8788_charger), GFP_KERNEL);
+	if (!pchg)
+		return -ENOMEM;
+
+	pchg->lp = lp;
+	pchg->pdata = lp->pdata ? lp->pdata->chg_pdata : NULL;
+	platform_set_drvdata(pdev, pchg);
+
+	ret = lp8788_update_charger_params(pdev, pchg);
+	if (ret)
+		return ret;
+
+	lp8788_setup_adc_channel(&pdev->dev, pchg);
+
+	ret = lp8788_psy_register(pdev, pchg);
+	if (ret)
+		return ret;
+
+	ret = lp8788_irq_register(pdev, pchg);
+	if (ret)
+		dev_warn(dev, "failed to register charger irq: %d\n", ret);
+
+	return 0;
+}
+
+static int lp8788_charger_remove(struct platform_device *pdev)
+{
+	struct lp8788_charger *pchg = platform_get_drvdata(pdev);
+
+	flush_work(&pchg->charger_work);
+	lp8788_irq_unregister(pdev, pchg);
+	lp8788_psy_unregister(pchg);
+
+	return 0;
+}
+
+static struct platform_driver lp8788_charger_driver = {
+	.probe = lp8788_charger_probe,
+	.remove = lp8788_charger_remove,
+	.driver = {
+		.name = LP8788_DEV_CHARGER,
+	},
+};
+module_platform_driver(lp8788_charger_driver);
+
+MODULE_DESCRIPTION("TI LP8788 Charger Driver");
+MODULE_AUTHOR("Milo Kim");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:lp8788-charger");