Adding upstream version 6.6.15.upstream/6.6.15

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

1 files changed, 990 insertions, 0 deletions

diff --git a/drivers/power/supply/cpcap-charger.c b/drivers/power/supply/cpcap-charger.c
new file mode 100644
index 000000000..be9764541
--- /dev/null
+++ b/drivers/power/supply/cpcap-charger.c
@@ -0,0 +1,990 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Motorola CPCAP PMIC battery charger driver
+ *
+ * Copyright (C) 2017 Tony Lindgren <tony@atomide.com>
+ *
+ * Rewritten for Linux power framework with some parts based on
+ * earlier driver found in the Motorola Linux kernel:
+ *
+ * Copyright (C) 2009-2010 Motorola, Inc.
+ */
+
+#include <linux/atomic.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/err.h>
+#include <linux/interrupt.h>
+#include <linux/notifier.h>
+#include <linux/of.h>
+#include <linux/of_platform.h>
+#include <linux/platform_device.h>
+#include <linux/power_supply.h>
+#include <linux/regmap.h>
+
+#include <linux/gpio/consumer.h>
+#include <linux/usb/phy_companion.h>
+#include <linux/phy/omap_usb.h>
+#include <linux/usb/otg.h>
+#include <linux/iio/consumer.h>
+#include <linux/mfd/motorola-cpcap.h>
+
+/*
+ * CPCAP_REG_CRM register bits. For documentation of somewhat similar hardware,
+ * see NXP "MC13783 Power Management and Audio Circuit Users's Guide"
+ * MC13783UG.pdf chapter "8.5 Battery Interface Register Summary". The registers
+ * and values for CPCAP are different, but some of the internal components seem
+ * similar. Also see the Motorola Linux kernel cpcap-regbits.h. CPCAP_REG_CHRGR_1
+ * bits that seem to describe the CRM register.
+ */
+#define CPCAP_REG_CRM_UNUSED_641_15	BIT(15)	/* 641 = register number */
+#define CPCAP_REG_CRM_UNUSED_641_14	BIT(14)	/* 641 = register number */
+#define CPCAP_REG_CRM_CHRG_LED_EN	BIT(13)	/* Charger LED */
+#define CPCAP_REG_CRM_RVRSMODE		BIT(12)	/* USB VBUS output enable */
+#define CPCAP_REG_CRM_ICHRG_TR1		BIT(11)	/* Trickle charge current */
+#define CPCAP_REG_CRM_ICHRG_TR0		BIT(10)
+#define CPCAP_REG_CRM_FET_OVRD		BIT(9)	/* 0 = hardware, 1 = FET_CTRL */
+#define CPCAP_REG_CRM_FET_CTRL		BIT(8)	/* BPFET 1 if FET_OVRD set */
+#define CPCAP_REG_CRM_VCHRG3		BIT(7)	/* Charge voltage bits */
+#define CPCAP_REG_CRM_VCHRG2		BIT(6)
+#define CPCAP_REG_CRM_VCHRG1		BIT(5)
+#define CPCAP_REG_CRM_VCHRG0		BIT(4)
+#define CPCAP_REG_CRM_ICHRG3		BIT(3)	/* Charge current bits */
+#define CPCAP_REG_CRM_ICHRG2		BIT(2)
+#define CPCAP_REG_CRM_ICHRG1		BIT(1)
+#define CPCAP_REG_CRM_ICHRG0		BIT(0)
+
+/* CPCAP_REG_CRM trickle charge voltages */
+#define CPCAP_REG_CRM_TR(val)		(((val) & 0x3) << 10)
+#define CPCAP_REG_CRM_TR_0A00		CPCAP_REG_CRM_TR(0x0)
+#define CPCAP_REG_CRM_TR_0A24		CPCAP_REG_CRM_TR(0x1)
+#define CPCAP_REG_CRM_TR_0A48		CPCAP_REG_CRM_TR(0x2)
+#define CPCAP_REG_CRM_TR_0A72		CPCAP_REG_CRM_TR(0x4)
+
+/*
+ * CPCAP_REG_CRM charge voltages based on the ADC channel 1 values.
+ * Note that these register bits don't match MC13783UG.pdf VCHRG
+ * register bits.
+ */
+#define CPCAP_REG_CRM_VCHRG(val)	(((val) & 0xf) << 4)
+#define CPCAP_REG_CRM_VCHRG_3V80	CPCAP_REG_CRM_VCHRG(0x0)
+#define CPCAP_REG_CRM_VCHRG_4V10	CPCAP_REG_CRM_VCHRG(0x1)
+#define CPCAP_REG_CRM_VCHRG_4V12	CPCAP_REG_CRM_VCHRG(0x2)
+#define CPCAP_REG_CRM_VCHRG_4V15	CPCAP_REG_CRM_VCHRG(0x3)
+#define CPCAP_REG_CRM_VCHRG_4V17	CPCAP_REG_CRM_VCHRG(0x4)
+#define CPCAP_REG_CRM_VCHRG_4V20	CPCAP_REG_CRM_VCHRG(0x5)
+#define CPCAP_REG_CRM_VCHRG_4V23	CPCAP_REG_CRM_VCHRG(0x6)
+#define CPCAP_REG_CRM_VCHRG_4V25	CPCAP_REG_CRM_VCHRG(0x7)
+#define CPCAP_REG_CRM_VCHRG_4V27	CPCAP_REG_CRM_VCHRG(0x8)
+#define CPCAP_REG_CRM_VCHRG_4V30	CPCAP_REG_CRM_VCHRG(0x9)
+#define CPCAP_REG_CRM_VCHRG_4V33	CPCAP_REG_CRM_VCHRG(0xa)
+#define CPCAP_REG_CRM_VCHRG_4V35	CPCAP_REG_CRM_VCHRG(0xb)
+#define CPCAP_REG_CRM_VCHRG_4V38	CPCAP_REG_CRM_VCHRG(0xc)
+#define CPCAP_REG_CRM_VCHRG_4V40	CPCAP_REG_CRM_VCHRG(0xd)
+#define CPCAP_REG_CRM_VCHRG_4V42	CPCAP_REG_CRM_VCHRG(0xe)
+#define CPCAP_REG_CRM_VCHRG_4V44	CPCAP_REG_CRM_VCHRG(0xf)
+
+/*
+ * CPCAP_REG_CRM charge currents. These seem to match MC13783UG.pdf
+ * values in "Table 8-3. Charge Path Regulator Current Limit
+ * Characteristics" for the nominal values.
+ *
+ * Except 70mA and 1.596A and unlimited, these are simply 88.7mA / step.
+ */
+#define CPCAP_REG_CRM_ICHRG(val)	(((val) & 0xf) << 0)
+#define CPCAP_REG_CRM_ICHRG_0A000	CPCAP_REG_CRM_ICHRG(0x0)
+#define CPCAP_REG_CRM_ICHRG_0A070	CPCAP_REG_CRM_ICHRG(0x1)
+#define CPCAP_REG_CRM_ICHRG_0A177	CPCAP_REG_CRM_ICHRG(0x2)
+#define CPCAP_REG_CRM_ICHRG_0A266	CPCAP_REG_CRM_ICHRG(0x3)
+#define CPCAP_REG_CRM_ICHRG_0A355	CPCAP_REG_CRM_ICHRG(0x4)
+#define CPCAP_REG_CRM_ICHRG_0A443	CPCAP_REG_CRM_ICHRG(0x5)
+#define CPCAP_REG_CRM_ICHRG_0A532	CPCAP_REG_CRM_ICHRG(0x6)
+#define CPCAP_REG_CRM_ICHRG_0A621	CPCAP_REG_CRM_ICHRG(0x7)
+#define CPCAP_REG_CRM_ICHRG_0A709	CPCAP_REG_CRM_ICHRG(0x8)
+#define CPCAP_REG_CRM_ICHRG_0A798	CPCAP_REG_CRM_ICHRG(0x9)
+#define CPCAP_REG_CRM_ICHRG_0A886	CPCAP_REG_CRM_ICHRG(0xa)
+#define CPCAP_REG_CRM_ICHRG_0A975	CPCAP_REG_CRM_ICHRG(0xb)
+#define CPCAP_REG_CRM_ICHRG_1A064	CPCAP_REG_CRM_ICHRG(0xc)
+#define CPCAP_REG_CRM_ICHRG_1A152	CPCAP_REG_CRM_ICHRG(0xd)
+#define CPCAP_REG_CRM_ICHRG_1A596	CPCAP_REG_CRM_ICHRG(0xe)
+#define CPCAP_REG_CRM_ICHRG_NO_LIMIT	CPCAP_REG_CRM_ICHRG(0xf)
+
+/* CPCAP_REG_VUSBC register bits needed for VBUS */
+#define CPCAP_BIT_VBUS_SWITCH		BIT(0)	/* VBUS boost to 5V */
+
+enum {
+	CPCAP_CHARGER_IIO_BATTDET,
+	CPCAP_CHARGER_IIO_VOLTAGE,
+	CPCAP_CHARGER_IIO_VBUS,
+	CPCAP_CHARGER_IIO_CHRG_CURRENT,
+	CPCAP_CHARGER_IIO_BATT_CURRENT,
+	CPCAP_CHARGER_IIO_NR,
+};
+
+struct cpcap_charger_ddata {
+	struct device *dev;
+	struct regmap *reg;
+	struct list_head irq_list;
+	struct delayed_work detect_work;
+	struct delayed_work vbus_work;
+	struct gpio_desc *gpio[2];		/* gpio_reven0 & 1 */
+
+	struct iio_channel *channels[CPCAP_CHARGER_IIO_NR];
+
+	struct power_supply *usb;
+
+	struct phy_companion comparator;	/* For USB VBUS */
+	unsigned int vbus_enabled:1;
+	unsigned int feeding_vbus:1;
+	atomic_t active;
+
+	int status;
+	int voltage;
+	int limit_current;
+};
+
+struct cpcap_interrupt_desc {
+	int irq;
+	struct list_head node;
+	const char *name;
+};
+
+struct cpcap_charger_ints_state {
+	bool chrg_det;
+	bool rvrs_chrg;
+	bool vbusov;
+
+	bool chrg_se1b;
+	bool rvrs_mode;
+	bool chrgcurr2;
+	bool chrgcurr1;
+	bool vbusvld;
+
+	bool battdetb;
+};
+
+static enum power_supply_property cpcap_charger_props[] = {
+	POWER_SUPPLY_PROP_STATUS,
+	POWER_SUPPLY_PROP_ONLINE,
+	POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE,
+	POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT,
+	POWER_SUPPLY_PROP_VOLTAGE_NOW,
+	POWER_SUPPLY_PROP_CURRENT_NOW,
+};
+
+static int cpcap_charger_get_charge_voltage(struct cpcap_charger_ddata *ddata)
+{
+	struct iio_channel *channel;
+	int error, value = 0;
+
+	channel = ddata->channels[CPCAP_CHARGER_IIO_VOLTAGE];
+	error = iio_read_channel_processed(channel, &value);
+	if (error < 0) {
+		dev_warn(ddata->dev, "%s failed: %i\n", __func__, error);
+
+		return 0;
+	}
+
+	return value;
+}
+
+static int cpcap_charger_get_charge_current(struct cpcap_charger_ddata *ddata)
+{
+	struct iio_channel *channel;
+	int error, value = 0;
+
+	channel = ddata->channels[CPCAP_CHARGER_IIO_CHRG_CURRENT];
+	error = iio_read_channel_processed(channel, &value);
+	if (error < 0) {
+		dev_warn(ddata->dev, "%s failed: %i\n", __func__, error);
+
+		return 0;
+	}
+
+	return value;
+}
+
+static int cpcap_charger_get_property(struct power_supply *psy,
+				      enum power_supply_property psp,
+				      union power_supply_propval *val)
+{
+	struct cpcap_charger_ddata *ddata = dev_get_drvdata(psy->dev.parent);
+
+	switch (psp) {
+	case POWER_SUPPLY_PROP_STATUS:
+		val->intval = ddata->status;
+		break;
+	case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
+		val->intval = ddata->limit_current;
+		break;
+	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
+		val->intval = ddata->voltage;
+		break;
+	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
+		if (ddata->status == POWER_SUPPLY_STATUS_CHARGING)
+			val->intval = cpcap_charger_get_charge_voltage(ddata) *
+				1000;
+		else
+			val->intval = 0;
+		break;
+	case POWER_SUPPLY_PROP_CURRENT_NOW:
+		if (ddata->status == POWER_SUPPLY_STATUS_CHARGING)
+			val->intval = cpcap_charger_get_charge_current(ddata) *
+				1000;
+		else
+			val->intval = 0;
+		break;
+	case POWER_SUPPLY_PROP_ONLINE:
+		val->intval = ddata->status == POWER_SUPPLY_STATUS_CHARGING;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int cpcap_charger_match_voltage(int voltage)
+{
+	switch (voltage) {
+	case 0 ... 4100000 - 1: return 3800000;
+	case 4100000 ... 4120000 - 1: return 4100000;
+	case 4120000 ... 4150000 - 1: return 4120000;
+	case 4150000 ... 4170000 - 1: return 4150000;
+	case 4170000 ... 4200000 - 1: return 4170000;
+	case 4200000 ... 4230000 - 1: return 4200000;
+	case 4230000 ... 4250000 - 1: return 4230000;
+	case 4250000 ... 4270000 - 1: return 4250000;
+	case 4270000 ... 4300000 - 1: return 4270000;
+	case 4300000 ... 4330000 - 1: return 4300000;
+	case 4330000 ... 4350000 - 1: return 4330000;
+	case 4350000 ... 4380000 - 1: return 4350000;
+	case 4380000 ... 4400000 - 1: return 4380000;
+	case 4400000 ... 4420000 - 1: return 4400000;
+	case 4420000 ... 4440000 - 1: return 4420000;
+	case 4440000: return 4440000;
+	default: return 0;
+	}
+}
+
+static int
+cpcap_charger_get_bat_const_charge_voltage(struct cpcap_charger_ddata *ddata)
+{
+	union power_supply_propval prop;
+	struct power_supply *battery;
+	int voltage = ddata->voltage;
+	int error;
+
+	battery = power_supply_get_by_name("battery");
+	if (battery) {
+		error = power_supply_get_property(battery,
+				POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE,
+				&prop);
+		if (!error)
+			voltage = prop.intval;
+
+		power_supply_put(battery);
+	}
+
+	return voltage;
+}
+
+static int cpcap_charger_current_to_regval(int microamp)
+{
+	int miliamp = microamp / 1000;
+	int res;
+
+	if (miliamp < 0)
+		return -EINVAL;
+	if (miliamp < 70)
+		return CPCAP_REG_CRM_ICHRG(0x0);
+	if (miliamp < 177)
+		return CPCAP_REG_CRM_ICHRG(0x1);
+	if (miliamp >= 1596)
+		return CPCAP_REG_CRM_ICHRG(0xe);
+
+	res = microamp / 88666;
+	if (res > 0xd)
+		res = 0xd;
+	return CPCAP_REG_CRM_ICHRG(res);
+}
+
+static int cpcap_charger_set_property(struct power_supply *psy,
+				      enum power_supply_property psp,
+				      const union power_supply_propval *val)
+{
+	struct cpcap_charger_ddata *ddata = dev_get_drvdata(psy->dev.parent);
+	int voltage, batvolt;
+
+	switch (psp) {
+	case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
+		if (cpcap_charger_current_to_regval(val->intval) < 0)
+			return -EINVAL;
+		ddata->limit_current = val->intval;
+		schedule_delayed_work(&ddata->detect_work, 0);
+		break;
+	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
+		voltage = cpcap_charger_match_voltage(val->intval);
+		batvolt = cpcap_charger_get_bat_const_charge_voltage(ddata);
+		if (voltage > batvolt)
+			voltage = batvolt;
+		ddata->voltage = voltage;
+		schedule_delayed_work(&ddata->detect_work, 0);
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int cpcap_charger_property_is_writeable(struct power_supply *psy,
+					       enum power_supply_property psp)
+{
+	switch (psp) {
+	case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
+	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
+		return 1;
+	default:
+		return 0;
+	}
+}
+
+static void cpcap_charger_set_cable_path(struct cpcap_charger_ddata *ddata,
+					 bool enabled)
+{
+	if (!ddata->gpio[0])
+		return;
+
+	gpiod_set_value(ddata->gpio[0], enabled);
+}
+
+static void cpcap_charger_set_inductive_path(struct cpcap_charger_ddata *ddata,
+					     bool enabled)
+{
+	if (!ddata->gpio[1])
+		return;
+
+	gpiod_set_value(ddata->gpio[1], enabled);
+}
+
+static void cpcap_charger_update_state(struct cpcap_charger_ddata *ddata,
+				       int state)
+{
+	const char *status;
+
+	if (state > POWER_SUPPLY_STATUS_FULL) {
+		dev_warn(ddata->dev, "unknown state: %i\n", state);
+
+		return;
+	}
+
+	ddata->status = state;
+
+	switch (state) {
+	case POWER_SUPPLY_STATUS_DISCHARGING:
+		status = "DISCONNECTED";
+		break;
+	case POWER_SUPPLY_STATUS_NOT_CHARGING:
+		status = "DETECTING";
+		break;
+	case POWER_SUPPLY_STATUS_CHARGING:
+		status = "CHARGING";
+		break;
+	case POWER_SUPPLY_STATUS_FULL:
+		status = "DONE";
+		break;
+	default:
+		return;
+	}
+
+	dev_dbg(ddata->dev, "state: %s\n", status);
+}
+
+static int cpcap_charger_disable(struct cpcap_charger_ddata *ddata)
+{
+	int error;
+
+	error = regmap_update_bits(ddata->reg, CPCAP_REG_CRM, 0x3fff,
+				   CPCAP_REG_CRM_FET_OVRD |
+				   CPCAP_REG_CRM_FET_CTRL);
+	if (error)
+		dev_err(ddata->dev, "%s failed with %i\n", __func__, error);
+
+	return error;
+}
+
+static int cpcap_charger_enable(struct cpcap_charger_ddata *ddata,
+				int max_voltage, int charge_current,
+				int trickle_current)
+{
+	int error;
+
+	if (!max_voltage || !charge_current)
+		return -EINVAL;
+
+	dev_dbg(ddata->dev, "enable: %i %i %i\n",
+		max_voltage, charge_current, trickle_current);
+
+	error = regmap_update_bits(ddata->reg, CPCAP_REG_CRM, 0x3fff,
+				   CPCAP_REG_CRM_CHRG_LED_EN |
+				   trickle_current |
+				   CPCAP_REG_CRM_FET_OVRD |
+				   CPCAP_REG_CRM_FET_CTRL |
+				   max_voltage |
+				   charge_current);
+	if (error)
+		dev_err(ddata->dev, "%s failed with %i\n", __func__, error);
+
+	return error;
+}
+
+static bool cpcap_charger_vbus_valid(struct cpcap_charger_ddata *ddata)
+{
+	int error, value = 0;
+	struct iio_channel *channel =
+		ddata->channels[CPCAP_CHARGER_IIO_VBUS];
+
+	error = iio_read_channel_processed(channel, &value);
+	if (error >= 0)
+		return value > 3900;
+
+	dev_err(ddata->dev, "error reading VBUS: %i\n", error);
+
+	return false;
+}
+
+/* VBUS control functions for the USB PHY companion */
+static void cpcap_charger_vbus_work(struct work_struct *work)
+{
+	struct cpcap_charger_ddata *ddata;
+	bool vbus = false;
+	int error;
+
+	ddata = container_of(work, struct cpcap_charger_ddata,
+			     vbus_work.work);
+
+	if (ddata->vbus_enabled) {
+		vbus = cpcap_charger_vbus_valid(ddata);
+		if (vbus) {
+			dev_dbg(ddata->dev, "VBUS already provided\n");
+
+			return;
+		}
+
+		ddata->feeding_vbus = true;
+		cpcap_charger_set_cable_path(ddata, false);
+		cpcap_charger_set_inductive_path(ddata, false);
+
+		error = cpcap_charger_disable(ddata);
+		if (error)
+			goto out_err;
+
+		cpcap_charger_update_state(ddata,
+					   POWER_SUPPLY_STATUS_DISCHARGING);
+
+		error = regmap_update_bits(ddata->reg, CPCAP_REG_VUSBC,
+					   CPCAP_BIT_VBUS_SWITCH,
+					   CPCAP_BIT_VBUS_SWITCH);
+		if (error)
+			goto out_err;
+
+		error = regmap_update_bits(ddata->reg, CPCAP_REG_CRM,
+					   CPCAP_REG_CRM_RVRSMODE,
+					   CPCAP_REG_CRM_RVRSMODE);
+		if (error)
+			goto out_err;
+	} else {
+		error = regmap_update_bits(ddata->reg, CPCAP_REG_VUSBC,
+					   CPCAP_BIT_VBUS_SWITCH, 0);
+		if (error)
+			goto out_err;
+
+		error = regmap_update_bits(ddata->reg, CPCAP_REG_CRM,
+					   CPCAP_REG_CRM_RVRSMODE, 0);
+		if (error)
+			goto out_err;
+
+		cpcap_charger_set_cable_path(ddata, true);
+		cpcap_charger_set_inductive_path(ddata, true);
+		ddata->feeding_vbus = false;
+	}
+
+	return;
+
+out_err:
+	cpcap_charger_update_state(ddata, POWER_SUPPLY_STATUS_UNKNOWN);
+	dev_err(ddata->dev, "%s could not %s vbus: %i\n", __func__,
+		ddata->vbus_enabled ? "enable" : "disable", error);
+}
+
+static int cpcap_charger_set_vbus(struct phy_companion *comparator,
+				  bool enabled)
+{
+	struct cpcap_charger_ddata *ddata =
+		container_of(comparator, struct cpcap_charger_ddata,
+			     comparator);
+
+	ddata->vbus_enabled = enabled;
+	schedule_delayed_work(&ddata->vbus_work, 0);
+
+	return 0;
+}
+
+/* Charger interrupt handling functions */
+
+static int cpcap_charger_get_ints_state(struct cpcap_charger_ddata *ddata,
+					struct cpcap_charger_ints_state *s)
+{
+	int val, error;
+
+	error = regmap_read(ddata->reg, CPCAP_REG_INTS1, &val);
+	if (error)
+		return error;
+
+	s->chrg_det = val & BIT(13);
+	s->rvrs_chrg = val & BIT(12);
+	s->vbusov = val & BIT(11);
+
+	error = regmap_read(ddata->reg, CPCAP_REG_INTS2, &val);
+	if (error)
+		return error;
+
+	s->chrg_se1b = val & BIT(13);
+	s->rvrs_mode = val & BIT(6);
+	s->chrgcurr2 = val & BIT(5);
+	s->chrgcurr1 = val & BIT(4);
+	s->vbusvld = val & BIT(3);
+
+	error = regmap_read(ddata->reg, CPCAP_REG_INTS4, &val);
+	if (error)
+		return error;
+
+	s->battdetb = val & BIT(6);
+
+	return 0;
+}
+
+static int cpcap_charger_voltage_to_regval(int voltage)
+{
+	int offset;
+
+	switch (voltage) {
+	case 0 ... 4100000 - 1:
+		return 0;
+	case 4100000 ... 4200000 - 1:
+		offset = 1;
+		break;
+	case 4200000 ... 4300000 - 1:
+		offset = 0;
+		break;
+	case 4300000 ... 4380000 - 1:
+		offset = -1;
+		break;
+	case 4380000 ... 4440000:
+		offset = -2;
+		break;
+	default:
+		return 0;
+	}
+
+	return ((voltage - 4100000) / 20000) + offset;
+}
+
+static void cpcap_charger_disconnect(struct cpcap_charger_ddata *ddata,
+				     int state, unsigned long delay)
+{
+	int error;
+
+	/* Update battery state before disconnecting the charger */
+	switch (state) {
+	case POWER_SUPPLY_STATUS_DISCHARGING:
+	case POWER_SUPPLY_STATUS_FULL:
+		power_supply_changed(ddata->usb);
+		break;
+	default:
+		break;
+	}
+
+	error = cpcap_charger_disable(ddata);
+	if (error) {
+		cpcap_charger_update_state(ddata, POWER_SUPPLY_STATUS_UNKNOWN);
+		return;
+	}
+
+	cpcap_charger_update_state(ddata, state);
+	power_supply_changed(ddata->usb);
+	schedule_delayed_work(&ddata->detect_work, delay);
+}
+
+static void cpcap_usb_detect(struct work_struct *work)
+{
+	struct cpcap_charger_ddata *ddata;
+	struct cpcap_charger_ints_state s;
+	int error, new_state;
+
+	ddata = container_of(work, struct cpcap_charger_ddata,
+			     detect_work.work);
+
+	error = cpcap_charger_get_ints_state(ddata, &s);
+	if (error)
+		return;
+
+	/* Just init the state if a charger is connected with no chrg_det set */
+	if (!s.chrg_det && s.chrgcurr1 && s.vbusvld) {
+		cpcap_charger_update_state(ddata,
+					   POWER_SUPPLY_STATUS_NOT_CHARGING);
+
+		return;
+	}
+
+	/*
+	 * If battery voltage is higher than charge voltage, it may have been
+	 * charged to 4.35V by Android. Try again in 10 minutes.
+	 */
+	if (cpcap_charger_get_charge_voltage(ddata) > ddata->voltage) {
+		cpcap_charger_disconnect(ddata,
+					 POWER_SUPPLY_STATUS_NOT_CHARGING,
+					 HZ * 60 * 10);
+
+		return;
+	}
+
+	/* Delay for 80ms to avoid vbus bouncing when usb cable is plugged in */
+	usleep_range(80000, 120000);
+
+	/* Throttle chrgcurr2 interrupt for charger done and retry */
+	switch (ddata->status) {
+	case POWER_SUPPLY_STATUS_CHARGING:
+		if (s.chrgcurr2)
+			break;
+		new_state = POWER_SUPPLY_STATUS_FULL;
+
+		if (s.chrgcurr1 && s.vbusvld) {
+			cpcap_charger_disconnect(ddata, new_state, HZ * 5);
+			return;
+		}
+		break;
+	case POWER_SUPPLY_STATUS_FULL:
+		if (!s.chrgcurr2)
+			break;
+		if (s.vbusvld)
+			new_state = POWER_SUPPLY_STATUS_NOT_CHARGING;
+		else
+			new_state = POWER_SUPPLY_STATUS_DISCHARGING;
+
+		cpcap_charger_disconnect(ddata, new_state, HZ * 5);
+
+		return;
+	default:
+		break;
+	}
+
+	if (!ddata->feeding_vbus && cpcap_charger_vbus_valid(ddata) &&
+	    s.chrgcurr1) {
+		int max_current;
+		int vchrg, ichrg;
+		union power_supply_propval val;
+		struct power_supply *battery;
+
+		battery = power_supply_get_by_name("battery");
+		if (IS_ERR_OR_NULL(battery)) {
+			dev_err(ddata->dev, "battery power_supply not available %li\n",
+					PTR_ERR(battery));
+			return;
+		}
+
+		error = power_supply_get_property(battery, POWER_SUPPLY_PROP_PRESENT, &val);
+		power_supply_put(battery);
+		if (error)
+			goto out_err;
+
+		if (val.intval) {
+			max_current = 1596000;
+		} else {
+			dev_info(ddata->dev, "battery not inserted, charging disabled\n");
+			max_current = 0;
+		}
+
+		if (max_current > ddata->limit_current)
+			max_current = ddata->limit_current;
+
+		ichrg = cpcap_charger_current_to_regval(max_current);
+		vchrg = cpcap_charger_voltage_to_regval(ddata->voltage);
+		error = cpcap_charger_enable(ddata,
+					     CPCAP_REG_CRM_VCHRG(vchrg),
+					     ichrg, 0);
+		if (error)
+			goto out_err;
+		cpcap_charger_update_state(ddata,
+					   POWER_SUPPLY_STATUS_CHARGING);
+	} else {
+		error = cpcap_charger_disable(ddata);
+		if (error)
+			goto out_err;
+		cpcap_charger_update_state(ddata,
+					   POWER_SUPPLY_STATUS_DISCHARGING);
+	}
+
+	power_supply_changed(ddata->usb);
+	return;
+
+out_err:
+	cpcap_charger_update_state(ddata, POWER_SUPPLY_STATUS_UNKNOWN);
+	dev_err(ddata->dev, "%s failed with %i\n", __func__, error);
+}
+
+static irqreturn_t cpcap_charger_irq_thread(int irq, void *data)
+{
+	struct cpcap_charger_ddata *ddata = data;
+
+	if (!atomic_read(&ddata->active))
+		return IRQ_NONE;
+
+	schedule_delayed_work(&ddata->detect_work, 0);
+
+	return IRQ_HANDLED;
+}
+
+static int cpcap_usb_init_irq(struct platform_device *pdev,
+			      struct cpcap_charger_ddata *ddata,
+			      const char *name)
+{
+	struct cpcap_interrupt_desc *d;
+	int irq, error;
+
+	irq = platform_get_irq_byname(pdev, name);
+	if (irq < 0)
+		return -ENODEV;
+
+	error = devm_request_threaded_irq(ddata->dev, irq, NULL,
+					  cpcap_charger_irq_thread,
+					  IRQF_SHARED | IRQF_ONESHOT,
+					  name, ddata);
+	if (error) {
+		dev_err(ddata->dev, "could not get irq %s: %i\n",
+			name, error);
+
+		return error;
+	}
+
+	d = devm_kzalloc(ddata->dev, sizeof(*d), GFP_KERNEL);
+	if (!d)
+		return -ENOMEM;
+
+	d->name = name;
+	d->irq = irq;
+	list_add(&d->node, &ddata->irq_list);
+
+	return 0;
+}
+
+static const char * const cpcap_charger_irqs[] = {
+	/* REG_INT_0 */
+	"chrg_det", "rvrs_chrg",
+
+	/* REG_INT1 */
+	"chrg_se1b", "se0conn", "rvrs_mode", "chrgcurr2", "chrgcurr1", "vbusvld",
+
+	/* REG_INT_3 */
+	"battdetb",
+};
+
+static int cpcap_usb_init_interrupts(struct platform_device *pdev,
+				     struct cpcap_charger_ddata *ddata)
+{
+	int i, error;
+
+	for (i = 0; i < ARRAY_SIZE(cpcap_charger_irqs); i++) {
+		error = cpcap_usb_init_irq(pdev, ddata, cpcap_charger_irqs[i]);
+		if (error)
+			return error;
+	}
+
+	return 0;
+}
+
+static void cpcap_charger_init_optional_gpios(struct cpcap_charger_ddata *ddata)
+{
+	int i;
+
+	for (i = 0; i < 2; i++) {
+		ddata->gpio[i] = devm_gpiod_get_index(ddata->dev, "mode",
+						      i, GPIOD_OUT_HIGH);
+		if (IS_ERR(ddata->gpio[i])) {
+			dev_info(ddata->dev, "no mode change GPIO%i: %li\n",
+				 i, PTR_ERR(ddata->gpio[i]));
+			ddata->gpio[i] = NULL;
+		}
+	}
+}
+
+static int cpcap_charger_init_iio(struct cpcap_charger_ddata *ddata)
+{
+	const char * const names[CPCAP_CHARGER_IIO_NR] = {
+		"battdetb", "battp", "vbus", "chg_isense", "batti",
+	};
+	int error, i;
+
+	for (i = 0; i < CPCAP_CHARGER_IIO_NR; i++) {
+		ddata->channels[i] = devm_iio_channel_get(ddata->dev,
+							  names[i]);
+		if (IS_ERR(ddata->channels[i])) {
+			error = PTR_ERR(ddata->channels[i]);
+			goto out_err;
+		}
+
+		if (!ddata->channels[i]->indio_dev) {
+			error = -ENXIO;
+			goto out_err;
+		}
+	}
+
+	return 0;
+
+out_err:
+	if (error != -EPROBE_DEFER)
+		dev_err(ddata->dev, "could not initialize VBUS or ID IIO: %i\n",
+			error);
+
+	return error;
+}
+
+static char *cpcap_charger_supplied_to[] = {
+	"battery",
+};
+
+static const struct power_supply_desc cpcap_charger_usb_desc = {
+	.name		= "usb",
+	.type		= POWER_SUPPLY_TYPE_USB,
+	.properties	= cpcap_charger_props,
+	.num_properties	= ARRAY_SIZE(cpcap_charger_props),
+	.get_property	= cpcap_charger_get_property,
+	.set_property	= cpcap_charger_set_property,
+	.property_is_writeable = cpcap_charger_property_is_writeable,
+};
+
+#ifdef CONFIG_OF
+static const struct of_device_id cpcap_charger_id_table[] = {
+	{
+		.compatible = "motorola,mapphone-cpcap-charger",
+	},
+	{},
+};
+MODULE_DEVICE_TABLE(of, cpcap_charger_id_table);
+#endif
+
+static int cpcap_charger_probe(struct platform_device *pdev)
+{
+	struct cpcap_charger_ddata *ddata;
+	const struct of_device_id *of_id;
+	struct power_supply_config psy_cfg = {};
+	int error;
+
+	of_id = of_match_device(of_match_ptr(cpcap_charger_id_table),
+				&pdev->dev);
+	if (!of_id)
+		return -EINVAL;
+
+	ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
+	if (!ddata)
+		return -ENOMEM;
+
+	ddata->dev = &pdev->dev;
+	ddata->voltage = 4200000;
+	ddata->limit_current = 532000;
+
+	ddata->reg = dev_get_regmap(ddata->dev->parent, NULL);
+	if (!ddata->reg)
+		return -ENODEV;
+
+	INIT_LIST_HEAD(&ddata->irq_list);
+	INIT_DELAYED_WORK(&ddata->detect_work, cpcap_usb_detect);
+	INIT_DELAYED_WORK(&ddata->vbus_work, cpcap_charger_vbus_work);
+	platform_set_drvdata(pdev, ddata);
+
+	error = cpcap_charger_init_iio(ddata);
+	if (error)
+		return error;
+
+	atomic_set(&ddata->active, 1);
+
+	psy_cfg.of_node = pdev->dev.of_node;
+	psy_cfg.drv_data = ddata;
+	psy_cfg.supplied_to = cpcap_charger_supplied_to;
+	psy_cfg.num_supplicants = ARRAY_SIZE(cpcap_charger_supplied_to),
+
+	ddata->usb = devm_power_supply_register(ddata->dev,
+						&cpcap_charger_usb_desc,
+						&psy_cfg);
+	if (IS_ERR(ddata->usb)) {
+		error = PTR_ERR(ddata->usb);
+		dev_err(ddata->dev, "failed to register USB charger: %i\n",
+			error);
+
+		return error;
+	}
+
+	error = cpcap_usb_init_interrupts(pdev, ddata);
+	if (error)
+		return error;
+
+	ddata->comparator.set_vbus = cpcap_charger_set_vbus;
+	error = omap_usb2_set_comparator(&ddata->comparator);
+	if (error == -ENODEV) {
+		dev_info(ddata->dev, "charger needs phy, deferring probe\n");
+		return -EPROBE_DEFER;
+	}
+
+	cpcap_charger_init_optional_gpios(ddata);
+
+	schedule_delayed_work(&ddata->detect_work, 0);
+
+	return 0;
+}
+
+static void cpcap_charger_shutdown(struct platform_device *pdev)
+{
+	struct cpcap_charger_ddata *ddata = platform_get_drvdata(pdev);
+	int error;
+
+	atomic_set(&ddata->active, 0);
+	error = omap_usb2_set_comparator(NULL);
+	if (error)
+		dev_warn(ddata->dev, "could not clear USB comparator: %i\n",
+			 error);
+
+	error = cpcap_charger_disable(ddata);
+	if (error) {
+		cpcap_charger_update_state(ddata, POWER_SUPPLY_STATUS_UNKNOWN);
+		dev_warn(ddata->dev, "could not clear charger: %i\n",
+			 error);
+	}
+	cpcap_charger_update_state(ddata, POWER_SUPPLY_STATUS_DISCHARGING);
+	cancel_delayed_work_sync(&ddata->vbus_work);
+	cancel_delayed_work_sync(&ddata->detect_work);
+}
+
+static int cpcap_charger_remove(struct platform_device *pdev)
+{
+	cpcap_charger_shutdown(pdev);
+
+	return 0;
+}
+
+static struct platform_driver cpcap_charger_driver = {
+	.probe = cpcap_charger_probe,
+	.driver	= {
+		.name	= "cpcap-charger",
+		.of_match_table = of_match_ptr(cpcap_charger_id_table),
+	},
+	.shutdown = cpcap_charger_shutdown,
+	.remove	= cpcap_charger_remove,
+};
+module_platform_driver(cpcap_charger_driver);
+
+MODULE_AUTHOR("Tony Lindgren <tony@atomide.com>");
+MODULE_DESCRIPTION("CPCAP Battery Charger Interface driver");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:cpcap-charger");