Message-ID: <1523459382-31523-1-git-send-email-stefan.popa@analog.com>
Date:   Wed, 11 Apr 2018 18:09:42 +0300
From:   Stefan Popa <stefan.popa@...log.com>
To:     <sre@...nel.org>
CC:     <davem@...emloft.net>, <mchehab@...nel.org>,
        <gregkh@...uxfoundation.org>, <linus.walleij@...aro.org>,
        <akpm@...ux-foundation.org>, <rdunlap@...radead.org>,
        <linux-pm@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <stefan.popa@...log.com>
Subject: [PATCH v3 1/4] adp5061: New driver for ADP5061 I2C battery charger

This patch adds basic support for Analog Devices I2C programmable linear
battery charger.

With this driver, some parameters can be read and configured such as:
* trickle charge current level (PRECHARGE_CURRENT)
* trickle charge voltage threshold (VOLTAGE_MIN)
* weak charge threshold (VOLTAGE_AVG)
* constant current (CONSTANT_CHARGE_CURRENT)
* constant charge voltage limit (CONSTANT_CHARGE_VOLTAGE_MAX)
* battery full (CAPACITY_LEVEL)
* input current limit (INPUT_CURRENT_LIMIT)
* charger status (STATUS)
* battery status (CAPACITY_LEVEL)
* termination current (CHARGE_TERM_CURRENT)

Datasheet:
http://www.analog.com/media/en/technical-documentation/data-sheets/ADP5061.pdf

Signed-off-by: Stefan Popa <stefan.popa@...log.com>
---
Changes in v2:
	- Fixed typo in Kconfig file: build -> built.
Changes in v3:
	- Described the commit message parameters with bindings to
	  power-supply properties.
 MAINTAINERS                    |   7 +
 drivers/power/supply/Kconfig   |  11 +
 drivers/power/supply/Makefile  |   1 +
 drivers/power/supply/adp5061.c | 745 +++++++++++++++++++++++++++++++++++++++++
 4 files changed, 764 insertions(+)
 create mode 100644 drivers/power/supply/adp5061.c

diff --git a/MAINTAINERS b/MAINTAINERS
index 3bdc260..60cd6db 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -797,6 +797,13 @@ L:	linux-media@...r.kernel.org
 S:	Maintained
 F:	drivers/media/i2c/ad9389b*
 
+ANALOG DEVICES INC ADP5061 DRIVER
+M:	Stefan Popa <stefan.popa@...log.com>
+L:	linux-pm@...r.kernel.org
+W:	http://ez.analog.com/community/linux-device-drivers
+S:	Supported
+F:	drivers/power/supply/adp5061.c
+
 ANALOG DEVICES INC ADV7180 DRIVER
 M:	Lars-Peter Clausen <lars@...afoo.de>
 L:	linux-media@...r.kernel.org
diff --git a/drivers/power/supply/Kconfig b/drivers/power/supply/Kconfig
index 428b426..4cc9aa9 100644
--- a/drivers/power/supply/Kconfig
+++ b/drivers/power/supply/Kconfig
@@ -75,6 +75,17 @@ config BATTERY_88PM860X
 	help
 	  Say Y here to enable battery monitor for Marvell 88PM860x chip.
 
+config CHARGER_ADP5061
+	tristate "ADP5061 battery charger driver"
+	depends on I2C
+	select REGMAP_I2C
+	help
+	  Say Y here to enable support for the ADP5061 standalone battery
+	  charger.
+
+	  This driver can be built as a module. If so, the module will be
+	  called adp5061.
+
 config BATTERY_ACT8945A
 	tristate "Active-semi ACT8945A charger driver"
 	depends on MFD_ACT8945A || COMPILE_TEST
diff --git a/drivers/power/supply/Makefile b/drivers/power/supply/Makefile
index e83aa84..71b1398 100644
--- a/drivers/power/supply/Makefile
+++ b/drivers/power/supply/Makefile
@@ -18,6 +18,7 @@ obj-$(CONFIG_WM8350_POWER)	+= wm8350_power.o
 obj-$(CONFIG_TEST_POWER)	+= test_power.o
 
 obj-$(CONFIG_BATTERY_88PM860X)	+= 88pm860x_battery.o
+obj-$(CONFIG_CHARGER_ADP5061)	+= adp5061.o
 obj-$(CONFIG_BATTERY_ACT8945A)	+= act8945a_charger.o
 obj-$(CONFIG_BATTERY_AXP20X)	+= axp20x_battery.o
 obj-$(CONFIG_CHARGER_AXP20X)	+= axp20x_ac_power.o
diff --git a/drivers/power/supply/adp5061.c b/drivers/power/supply/adp5061.c
new file mode 100644
index 0000000..c00a02e
--- /dev/null
+++ b/drivers/power/supply/adp5061.c
@@ -0,0 +1,745 @@
+/*
+ * ADP5061 I2C Programmable Linear Battery Charger
+ *
+ * Copyright 2018 Analog Devices Inc.
+ *
+ * Licensed under the GPL-2.
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/i2c.h>
+#include <linux/delay.h>
+#include <linux/pm.h>
+#include <linux/mod_devicetable.h>
+#include <linux/power_supply.h>
+#include <linux/platform_device.h>
+#include <linux/of.h>
+#include <linux/regmap.h>
+
+/* ADP5061 registers definition */
+#define ADP5061_ID			0x00
+#define ADP5061_REV			0x01
+#define ADP5061_VINX_SET		0x02
+#define ADP5061_TERM_SET		0x03
+#define ADP5061_CHG_CURR		0x04
+#define ADP5061_VOLTAGE_TH		0x05
+#define ADP5061_TIMER_SET		0x06
+#define ADP5061_FUNC_SET_1		0x07
+#define ADP5061_FUNC_SET_2		0x08
+#define ADP5061_INT_EN			0x09
+#define ADP5061_INT_ACT			0x0A
+#define ADP5061_CHG_STATUS_1		0x0B
+#define ADP5061_CHG_STATUS_2		0x0C
+#define ADP5061_FAULT			0x0D
+#define ADP5061_BATTERY_SHORT		0x10
+#define ADP5061_IEND			0x11
+
+/* ADP5061_VINX_SET */
+#define ADP5061_VINX_SET_ILIM_MSK		GENMASK(3, 0)
+#define ADP5061_VINX_SET_ILIM_MODE(x)		(((x) & 0x0F) << 0)
+
+/* ADP5061_TERM_SET */
+#define ADP5061_TERM_SET_VTRM_MSK		GENMASK(7, 2)
+#define ADP5061_TERM_SET_VTRM_MODE(x)		(((x) & 0x3F) << 2)
+#define ADP5061_TERM_SET_CHG_VLIM_MSK		GENMASK(1, 0)
+#define ADP5061_TERM_SET_CHG_VLIM_MODE(x)	(((x) & 0x03) << 0)
+
+/* ADP5061_CHG_CURR */
+#define ADP5061_CHG_CURR_ICHG_MSK		GENMASK(6, 2)
+#define ADP5061_CHG_CURR_ICHG_MODE(x)		(((x) & 0x1F) << 2)
+#define ADP5061_CHG_CURR_ITRK_DEAD_MSK		GENMASK(1, 0)
+#define ADP5061_CHG_CURR_ITRK_DEAD_MODE(x)	(((x) & 0x03) << 0)
+
+/* ADP5061_VOLTAGE_TH */
+#define ADP5061_VOLTAGE_TH_DIS_RCH_MSK		BIT(7)
+#define ADP5061_VOLTAGE_TH_DIS_RCH_MODE(x)	(((x) & 0x01) << 7)
+#define ADP5061_VOLTAGE_TH_VRCH_MSK		GENMASK(6, 5)
+#define ADP5061_VOLTAGE_TH_VRCH_MODE(x)		(((x) & 0x03) << 5)
+#define ADP5061_VOLTAGE_TH_VTRK_DEAD_MSK	GENMASK(4, 3)
+#define ADP5061_VOLTAGE_TH_VTRK_DEAD_MODE(x)	(((x) & 0x03) << 3)
+#define ADP5061_VOLTAGE_TH_VWEAK_MSK		GENMASK(2, 0)
+#define ADP5061_VOLTAGE_TH_VWEAK_MODE(x)	(((x) & 0x07) << 0)
+
+/* ADP5061_CHG_STATUS_1 */
+#define ADP5061_CHG_STATUS_1_VIN_OV(x)		(((x) >> 7) & 0x1)
+#define ADP5061_CHG_STATUS_1_VIN_OK(x)		(((x) >> 6) & 0x1)
+#define ADP5061_CHG_STATUS_1_VIN_ILIM(x)	(((x) >> 5) & 0x1)
+#define ADP5061_CHG_STATUS_1_THERM_LIM(x)	(((x) >> 4) & 0x1)
+#define ADP5061_CHG_STATUS_1_CHDONE(x)		(((x) >> 3) & 0x1)
+#define ADP5061_CHG_STATUS_1_CHG_STATUS(x)	(((x) >> 0) & 0x7)
+
+/* ADP5061_CHG_STATUS_2 */
+#define ADP5061_CHG_STATUS_2_THR_STATUS(x)	(((x) >> 5) & 0x7)
+#define ADP5061_CHG_STATUS_2_RCH_LIM_INFO(x)	(((x) >> 3) & 0x1)
+#define ADP5061_CHG_STATUS_2_BAT_STATUS(x)	(((x) >> 0) & 0x7)
+
+/* ADP5061_IEND */
+#define ADP5061_IEND_IEND_MSK			GENMASK(7, 5)
+#define ADP5061_IEND_IEND_MODE(x)		(((x) & 0x07) << 5)
+
+#define ADP5061_NO_BATTERY	0x01
+#define ADP5061_ICHG_MAX	1300 // mA
+
+enum adp5061_chg_status {
+	ADP5061_CHG_OFF,
+	ADP5061_CHG_TRICKLE,
+	ADP5061_CHG_FAST_CC,
+	ADP5061_CHG_FAST_CV,
+	ADP5061_CHG_COMPLETE,
+	ADP5061_CHG_LDO_MODE,
+	ADP5061_CHG_TIMER_EXP,
+	ADP5061_CHG_BAT_DET,
+};
+
+static const int adp5061_chg_type[4] = {
+	[ADP5061_CHG_OFF] = POWER_SUPPLY_CHARGE_TYPE_NONE,
+	[ADP5061_CHG_TRICKLE] = POWER_SUPPLY_CHARGE_TYPE_TRICKLE,
+	[ADP5061_CHG_FAST_CC] = POWER_SUPPLY_CHARGE_TYPE_FAST,
+	[ADP5061_CHG_FAST_CV] = POWER_SUPPLY_CHARGE_TYPE_FAST,
+};
+
+static const int adp5061_vweak_th[8] = {
+	2700, 2800, 2900, 3000, 3100, 3200, 3300, 3400,
+};
+
+static const int adp5061_prechg_current[4] = {
+	5, 10, 20, 80,
+};
+
+static const int adp5061_vmin[4] = {
+	2000, 2500, 2600, 2900,
+};
+
+static const int adp5061_const_chg_vmax[4] = {
+	3200, 3400, 3700, 3800,
+};
+
+static const int adp5061_const_ichg[24] = {
+	50, 100, 150, 200, 250, 300, 350, 400, 450, 500, 550, 600, 650,
+	700, 750, 800, 850, 900, 950, 1000, 1050, 1100, 1200, 1300,
+};
+
+static const int adp5061_vmax[36] = {
+	3800, 3820, 3840, 3860, 3880, 3900, 3920, 3940, 3960, 3980,
+	4000, 4020, 4040, 4060, 4080, 4100, 4120, 4140, 4160, 4180,
+	4200, 4220, 4240, 4260, 4280, 4300, 4320, 4340, 4360, 4380,
+	4400, 4420, 4440, 4460, 4480, 4500,
+};
+
+static const int adp5061_in_current_lim[16] = {
+	100, 150, 200, 250, 300, 400, 500, 600, 700,
+	800, 900, 1000, 1200, 1500, 1800, 2100,
+};
+
+static const int adp5061_iend[8] = {
+	12500, 32500, 52500, 72500, 92500, 117500, 142500, 170000,
+};
+
+struct adp5061_state {
+	struct i2c_client		*client;
+	struct regmap			*regmap;
+	struct power_supply		*psy;
+};
+
+static int adp5061_get_array_index(const int *array, u8 size, int val)
+{
+	int i;
+
+	for (i = 1; i < size; i++) {
+		if (val < array[i])
+			break;
+	}
+
+	return i-1;
+}
+
+static int adp5061_get_status(struct adp5061_state *st,
+			      u8 *status1, u8 *status2)
+{
+	u8 buf[2];
+	int ret;
+
+	/* CHG_STATUS1 and CHG_STATUS2 are adjacent regs */
+	ret = regmap_bulk_read(st->regmap, ADP5061_CHG_STATUS_1,
+			       &buf[0], 2);
+	if (ret < 0)
+		return ret;
+
+	*status1 = buf[0];
+	*status2 = buf[1];
+
+	return ret;
+}
+
+static int adp5061_get_input_current_limit(struct adp5061_state *st,
+		union power_supply_propval *val)
+{
+	unsigned int regval;
+	int mode, ret;
+
+	ret = regmap_read(st->regmap, ADP5061_VINX_SET, &regval);
+	if (ret < 0)
+		return ret;
+
+	mode = ADP5061_VINX_SET_ILIM_MODE(regval);
+	val->intval = adp5061_in_current_lim[mode] * 1000;
+
+	return ret;
+}
+
+static int adp5061_set_input_current_limit(struct adp5061_state *st, int val)
+{
+	int index;
+
+	/* Convert from uA to mA */
+	val /= 1000;
+	index = adp5061_get_array_index(adp5061_in_current_lim,
+					ARRAY_SIZE(adp5061_in_current_lim),
+					val);
+	if (index < 0)
+		return index;
+
+	return regmap_update_bits(st->regmap, ADP5061_VINX_SET,
+				  ADP5061_VINX_SET_ILIM_MSK,
+				  ADP5061_VINX_SET_ILIM_MODE(index));
+}
+
+static int adp5061_set_min_voltage(struct adp5061_state *st, int val)
+{
+	int index;
+
+	/* Convert from uV to mV */
+	val /= 1000;
+	index = adp5061_get_array_index(adp5061_vmin,
+					ARRAY_SIZE(adp5061_vmin),
+					val);
+	if (index < 0)
+		return index;
+
+	return regmap_update_bits(st->regmap, ADP5061_VOLTAGE_TH,
+				  ADP5061_VOLTAGE_TH_VTRK_DEAD_MSK,
+				  ADP5061_VOLTAGE_TH_VTRK_DEAD_MODE(index));
+}
+
+static int adp5061_get_min_voltage(struct adp5061_state *st,
+				   union power_supply_propval *val)
+{
+	unsigned int regval;
+	int ret;
+
+	ret = regmap_read(st->regmap, ADP5061_VOLTAGE_TH, &regval);
+	if (ret < 0)
+		return ret;
+
+	regval = ((regval & ADP5061_VOLTAGE_TH_VTRK_DEAD_MSK) >> 3);
+	val->intval = adp5061_vmin[regval] * 1000;
+
+	return ret;
+}
+
+static int adp5061_get_chg_volt_lim(struct adp5061_state *st,
+				    union power_supply_propval *val)
+{
+	unsigned int regval;
+	int mode, ret;
+
+	ret = regmap_read(st->regmap, ADP5061_TERM_SET, &regval);
+	if (ret < 0)
+		return ret;
+
+	mode = ADP5061_TERM_SET_CHG_VLIM_MODE(regval);
+	val->intval = adp5061_const_chg_vmax[mode] * 1000;
+
+	return ret;
+}
+
+static int adp5061_get_max_voltage(struct adp5061_state *st,
+				   union power_supply_propval *val)
+{
+	unsigned int regval;
+	int ret;
+
+	ret = regmap_read(st->regmap, ADP5061_TERM_SET, &regval);
+	if (ret < 0)
+		return ret;
+
+	regval = ((regval & ADP5061_TERM_SET_VTRM_MSK) >> 2) - 0x0F;
+	if (regval > ARRAY_SIZE(adp5061_vmax))
+		regval = ARRAY_SIZE(adp5061_vmax);
+
+	val->intval = adp5061_vmax[regval] * 1000;
+
+	return ret;
+}
+
+static int adp5061_set_max_voltage(struct adp5061_state *st, int val)
+{
+	int vmax_index;
+
+	/* Convert from uV to mV */
+	val /= 1000;
+	if (val > 4500)
+		val = 4500;
+
+	vmax_index = adp5061_get_array_index(adp5061_vmax,
+					     ARRAY_SIZE(adp5061_vmax), val);
+	if (vmax_index < 0)
+		return vmax_index;
+
+	vmax_index += 0x0F;
+
+	return regmap_update_bits(st->regmap, ADP5061_TERM_SET,
+				  ADP5061_TERM_SET_VTRM_MSK,
+				  ADP5061_TERM_SET_VTRM_MODE(vmax_index));
+}
+
+static int adp5061_set_const_chg_vmax(struct adp5061_state *st, int val)
+{
+	int index;
+
+	/* Convert from uV to mV */
+	val /= 1000;
+	index = adp5061_get_array_index(adp5061_const_chg_vmax,
+					ARRAY_SIZE(adp5061_const_chg_vmax),
+					val);
+	if (index < 0)
+		return index;
+
+	return regmap_update_bits(st->regmap, ADP5061_TERM_SET,
+				  ADP5061_TERM_SET_CHG_VLIM_MSK,
+				  ADP5061_TERM_SET_CHG_VLIM_MODE(index));
+}
+
+static int adp5061_set_const_chg_current(struct adp5061_state *st, int val)
+{
+
+	int index;
+
+	/* Convert from uA to mA */
+	val /= 1000;
+	if (val > ADP5061_ICHG_MAX)
+		val = ADP5061_ICHG_MAX;
+
+	index = adp5061_get_array_index(adp5061_const_ichg,
+					ARRAY_SIZE(adp5061_const_ichg),
+					val);
+	if (index < 0)
+		return index;
+
+	return regmap_update_bits(st->regmap, ADP5061_CHG_CURR,
+				  ADP5061_CHG_CURR_ICHG_MSK,
+				  ADP5061_CHG_CURR_ICHG_MODE(index));
+}
+
+static int adp5061_get_const_chg_current(struct adp5061_state *st,
+		union power_supply_propval *val)
+{
+	unsigned int regval;
+	int ret;
+
+	ret = regmap_read(st->regmap, ADP5061_CHG_CURR, &regval);
+	if (ret < 0)
+		return ret;
+
+	regval = ((regval & ADP5061_CHG_CURR_ICHG_MSK) >> 2);
+	if (regval > ARRAY_SIZE(adp5061_const_ichg))
+		regval = ARRAY_SIZE(adp5061_const_ichg);
+
+	val->intval = adp5061_const_ichg[regval] * 1000;
+
+	return ret;
+}
+
+static int adp5061_get_prechg_current(struct adp5061_state *st,
+				      union power_supply_propval *val)
+{
+	unsigned int regval;
+	int ret;
+
+	ret = regmap_read(st->regmap, ADP5061_CHG_CURR, &regval);
+	if (ret < 0)
+		return ret;
+
+	regval &= ADP5061_CHG_CURR_ITRK_DEAD_MSK;
+	val->intval = adp5061_prechg_current[regval] * 1000;
+
+	return ret;
+}
+
+static int adp5061_set_prechg_current(struct adp5061_state *st, int val)
+{
+	int index;
+
+	/* Convert from uA to mA */
+	val /= 1000;
+	index = adp5061_get_array_index(adp5061_prechg_current,
+					ARRAY_SIZE(adp5061_prechg_current),
+					val);
+	if (index < 0)
+		return index;
+
+	return regmap_update_bits(st->regmap, ADP5061_CHG_CURR,
+				  ADP5061_CHG_CURR_ITRK_DEAD_MSK,
+				  ADP5061_CHG_CURR_ITRK_DEAD_MODE(index));
+}
+
+static int adp5061_get_vweak_th(struct adp5061_state *st,
+				union power_supply_propval *val)
+{
+	unsigned int regval;
+	int ret;
+
+	ret = regmap_read(st->regmap, ADP5061_VOLTAGE_TH, &regval);
+	if (ret < 0)
+		return ret;
+
+	regval &= ADP5061_VOLTAGE_TH_VWEAK_MSK;
+	val->intval = adp5061_vweak_th[regval] * 1000;
+
+	return ret;
+}
+
+static int adp5061_set_vweak_th(struct adp5061_state *st, int val)
+{
+	int index;
+
+	/* Convert from uV to mV */
+	val /= 1000;
+	index = adp5061_get_array_index(adp5061_vweak_th,
+					ARRAY_SIZE(adp5061_vweak_th),
+					val);
+	if (index < 0)
+		return index;
+
+	return regmap_update_bits(st->regmap, ADP5061_VOLTAGE_TH,
+				  ADP5061_VOLTAGE_TH_VWEAK_MSK,
+				  ADP5061_VOLTAGE_TH_VWEAK_MODE(index));
+}
+
+static int adp5061_get_chg_type(struct adp5061_state *st,
+				union power_supply_propval *val)
+{
+	u8 status1, status2;
+	int chg_type, ret;
+
+	ret = adp5061_get_status(st, &status1, &status2);
+	if (ret < 0)
+		return ret;
+
+	chg_type = adp5061_chg_type[ADP5061_CHG_STATUS_1_CHG_STATUS(status1)];
+	if (chg_type > ADP5061_CHG_FAST_CV)
+		val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
+	else
+		val->intval = chg_type;
+
+	return ret;
+}
+
+static int adp5061_get_charger_status(struct adp5061_state *st,
+				      union power_supply_propval *val)
+{
+	u8 status1, status2;
+	int ret;
+
+	ret = adp5061_get_status(st, &status1, &status2);
+	if (ret < 0)
+		return ret;
+
+	switch (ADP5061_CHG_STATUS_1_CHG_STATUS(status1)) {
+	case ADP5061_CHG_OFF:
+		val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
+		break;
+	case ADP5061_CHG_TRICKLE:
+	case ADP5061_CHG_FAST_CC:
+	case ADP5061_CHG_FAST_CV:
+		val->intval = POWER_SUPPLY_STATUS_CHARGING;
+		break;
+	case ADP5061_CHG_COMPLETE:
+		val->intval = POWER_SUPPLY_STATUS_FULL;
+		break;
+	case ADP5061_CHG_TIMER_EXP:
+		/* The battery must be discharging if there is a charge fault */
+		val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
+		break;
+	default:
+		val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
+	}
+
+	return ret;
+}
+
+static int adp5061_get_battery_status(struct adp5061_state *st,
+				      union power_supply_propval *val)
+{
+	u8 status1, status2;
+	int ret;
+
+	ret = adp5061_get_status(st, &status1, &status2);
+	if (ret < 0)
+		return ret;
+
+	switch (ADP5061_CHG_STATUS_2_BAT_STATUS(status2)) {
+	case 0x0: /* Battery monitor off */
+	case 0x1: /* No battery */
+		val->intval = POWER_SUPPLY_CAPACITY_LEVEL_UNKNOWN;
+		break;
+	case 0x2: /* VBAT < VTRK */
+		val->intval = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
+		break;
+	case 0x3: /* VTRK < VBAT_SNS < VWEAK */
+		val->intval = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
+		break;
+	case 0x4: /* VBAT_SNS > VWEAK */
+		val->intval = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
+		break;
+	}
+
+	return ret;
+}
+
+static int adp5061_get_termination_current(struct adp5061_state *st,
+					   union power_supply_propval *val)
+{
+	unsigned int regval;
+	int ret;
+
+	ret = regmap_read(st->regmap, ADP5061_IEND, &regval);
+	if (ret < 0)
+		return ret;
+
+	regval = (regval & ADP5061_IEND_IEND_MSK) >> 5;
+	val->intval = adp5061_iend[regval];
+
+	return ret;
+}
+
+static int adp5061_set_termination_current(struct adp5061_state *st, int val)
+{
+	int index;
+
+	index = adp5061_get_array_index(adp5061_iend,
+					ARRAY_SIZE(adp5061_iend),
+					val);
+	if (index < 0)
+		return index;
+
+	return regmap_update_bits(st->regmap, ADP5061_IEND,
+				  ADP5061_IEND_IEND_MSK,
+				  ADP5061_IEND_IEND_MODE(index));
+}
+
+static int adp5061_get_property(struct power_supply *psy,
+				enum power_supply_property psp,
+				union power_supply_propval *val)
+{
+	struct adp5061_state *st = power_supply_get_drvdata(psy);
+	u8 status1, status2;
+	int mode, ret;
+
+	switch (psp) {
+	case POWER_SUPPLY_PROP_PRESENT:
+		ret = adp5061_get_status(st, &status1, &status2);
+		if (ret < 0)
+			return ret;
+
+		mode = ADP5061_CHG_STATUS_2_BAT_STATUS(status2);
+		if (mode == ADP5061_NO_BATTERY)
+			val->intval = 0;
+		else
+			val->intval = 1;
+		break;
+	case POWER_SUPPLY_PROP_CHARGE_TYPE:
+		return adp5061_get_chg_type(st, val);
+	case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
+		/* This property is used to indicate the input current
+		 * limit into VINx (ILIM)
+		 */
+		return adp5061_get_input_current_limit(st, val);
+	case POWER_SUPPLY_PROP_VOLTAGE_MAX:
+		/* This property is used to indicate the termination
+		 * voltage (VTRM)
+		 */
+		return adp5061_get_max_voltage(st, val);
+	case POWER_SUPPLY_PROP_VOLTAGE_MIN:
+		/*
+		 * This property is used to indicate the trickle to fast
+		 * charge threshold (VTRK_DEAD)
+		 */
+		return adp5061_get_min_voltage(st, val);
+	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX:
+		/* This property is used to indicate the charging
+		 * voltage limit (CHG_VLIM)
+		 */
+		return adp5061_get_chg_volt_lim(st, val);
+	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
+		/*
+		 * This property is used to indicate the value of the constant
+		 * current charge (ICHG)
+		 */
+		return adp5061_get_const_chg_current(st, val);
+	case POWER_SUPPLY_PROP_PRECHARGE_CURRENT:
+		/*
+		 * This property is used to indicate the value of the trickle
+		 * and weak charge currents (ITRK_DEAD)
+		 */
+		return adp5061_get_prechg_current(st, val);
+	case POWER_SUPPLY_PROP_VOLTAGE_AVG:
+		/*
+		 * This property is used to set the VWEAK threshold
+		 * bellow this value, weak charge mode is entered
+		 * above this value, fast chargerge mode is entered
+		 */
+		return adp5061_get_vweak_th(st, val);
+	case POWER_SUPPLY_PROP_STATUS:
+		/*
+		 * Indicate the charger status in relation to power
+		 * supply status property
+		 */
+		return adp5061_get_charger_status(st, val);
+	case POWER_SUPPLY_PROP_CAPACITY_LEVEL:
+		/*
+		 * Indicate the battery status in relation to power
+		 * supply capacity level property
+		 */
+		return adp5061_get_battery_status(st, val);
+	case POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT:
+		/* Indicate the values of the termination current */
+		return adp5061_get_termination_current(st, val);
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int adp5061_set_property(struct power_supply *psy,
+				enum power_supply_property psp,
+				const union power_supply_propval *val)
+{
+	struct adp5061_state *st = power_supply_get_drvdata(psy);
+
+	switch (psp) {
+	case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
+		return adp5061_set_input_current_limit(st, val->intval);
+	case POWER_SUPPLY_PROP_VOLTAGE_MAX:
+		return adp5061_set_max_voltage(st, val->intval);
+	case POWER_SUPPLY_PROP_VOLTAGE_MIN:
+		return adp5061_set_min_voltage(st, val->intval);
+	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX:
+		return adp5061_set_const_chg_vmax(st, val->intval);
+	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
+		return adp5061_set_const_chg_current(st, val->intval);
+	case POWER_SUPPLY_PROP_PRECHARGE_CURRENT:
+		return adp5061_set_prechg_current(st, val->intval);
+	case POWER_SUPPLY_PROP_VOLTAGE_AVG:
+		return adp5061_set_vweak_th(st, val->intval);
+	case POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT:
+		return adp5061_set_termination_current(st, val->intval);
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int adp5061_prop_writeable(struct power_supply *psy,
+				  enum power_supply_property psp)
+{
+	switch (psp) {
+	case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
+	case POWER_SUPPLY_PROP_VOLTAGE_MAX:
+	case POWER_SUPPLY_PROP_VOLTAGE_MIN:
+	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX:
+	case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
+	case POWER_SUPPLY_PROP_PRECHARGE_CURRENT:
+	case POWER_SUPPLY_PROP_VOLTAGE_AVG:
+	case POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT:
+		return 1;
+	default:
+		return 0;
+	}
+}
+
+static enum power_supply_property adp5061_props[] = {
+	POWER_SUPPLY_PROP_PRESENT,
+	POWER_SUPPLY_PROP_CHARGE_TYPE,
+	POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT,
+	POWER_SUPPLY_PROP_VOLTAGE_MAX,
+	POWER_SUPPLY_PROP_VOLTAGE_MIN,
+	POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX,
+	POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT,
+	POWER_SUPPLY_PROP_PRECHARGE_CURRENT,
+	POWER_SUPPLY_PROP_VOLTAGE_AVG,
+	POWER_SUPPLY_PROP_STATUS,
+	POWER_SUPPLY_PROP_CAPACITY_LEVEL,
+	POWER_SUPPLY_PROP_CHARGE_TERM_CURRENT,
+};
+
+static const struct regmap_config adp5061_regmap_config = {
+	.reg_bits = 8,
+	.val_bits = 8,
+};
+
+static const struct power_supply_desc adp5061_desc = {
+	.name			= "adp5061",
+	.type			= POWER_SUPPLY_TYPE_USB,
+	.get_property		= adp5061_get_property,
+	.set_property		= adp5061_set_property,
+	.property_is_writeable	= adp5061_prop_writeable,
+	.properties		= adp5061_props,
+	.num_properties		= ARRAY_SIZE(adp5061_props),
+};
+
+static int adp5061_probe(struct i2c_client *client,
+			 const struct i2c_device_id *id)
+{
+	struct power_supply_config psy_cfg = {};
+	struct adp5061_state *st;
+
+	st = devm_kzalloc(&client->dev, sizeof(*st), GFP_KERNEL);
+	if (!st)
+		return -ENOMEM;
+
+	st->client = client;
+	st->regmap = devm_regmap_init_i2c(client,
+					  &adp5061_regmap_config);
+	if (IS_ERR(st->regmap)) {
+		dev_err(&client->dev, "Failed to initialize register map\n");
+		return -EINVAL;
+	}
+
+	i2c_set_clientdata(client, st);
+	psy_cfg.drv_data = st;
+
+	st->psy = devm_power_supply_register(&client->dev,
+					     &adp5061_desc,
+					     &psy_cfg);
+
+	if (IS_ERR(st->psy)) {
+		dev_err(&client->dev, "Failed to register power supply\n");
+		return PTR_ERR(st->psy);
+	}
+
+	return 0;
+}
+
+static const struct i2c_device_id adp5061_id[] = {
+	{ "adp5061", 0},
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, adp5061_id);
+
+static struct i2c_driver adp5061_driver = {
+	.driver = {
+		.name = KBUILD_MODNAME,
+	},
+	.probe = adp5061_probe,
+	.id_table = adp5061_id,
+};
+module_i2c_driver(adp5061_driver);
+
+MODULE_DESCRIPTION("Analog Devices adp5061 battery charger driver");
+MODULE_AUTHOR("Stefan Popa <stefan.popa@...log.com>");
+MODULE_LICENSE("GPL v2");
-- 
2.7.4

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