Date:	Tue, 03 Feb 2015 14:04:03 +0900
From:	Jaewon Kim <jaewon02.kim@...sung.com>
To:	linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
	linux-pm@...r.kernel.org
Cc:	Inki Dae <inki.dae@...sung.com>,
	SangBae Lee <sangbae90.lee@...sung.com>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Lee Jones <lee.jones@...aro.org>,
	Chanwoo Choi <cw00.choi@...sung.com>,
	Sebastian Reichel <sre@...nel.org>,
	Mark Brown <broonie@...nel.org>,
	Beomho Seo <beomho.seo@...sung.com>,
	Jaewon Kim <jaewon02.kim@...sung.com>
Subject: [PATCH v2 3/6] power: max77843_charger: Add Max77843 charger device
 driver

From: Beomho Seo <beomho.seo@...sung.com>

This patch adds device driver of max77843 charger. This driver provide
initialize each charging mode(e.g. fast charge, top-off mode and constant
charging mode so on.). Additionally, control charging paramters to use
i2c interface.

Cc: Sebastian Reichel <sre@...nel.org>
Signed-off-by: Beomho Seo <beomho.seo@...sung.com>
---
 drivers/power/Kconfig            |    7 +
 drivers/power/Makefile           |    1 +
 drivers/power/max77843_charger.c |  508 ++++++++++++++++++++++++++++++++++++++
 3 files changed, 516 insertions(+)
 create mode 100644 drivers/power/max77843_charger.c

diff --git a/drivers/power/Kconfig b/drivers/power/Kconfig
index 0108c2a..a054a28 100644
--- a/drivers/power/Kconfig
+++ b/drivers/power/Kconfig
@@ -332,6 +332,13 @@ config CHARGER_MAX14577
 	  Say Y to enable support for the battery charger control sysfs and
 	  platform data of MAX14577/77836 MUICs.
 
+config CHARGER_MAX77843
+	tristate "Maxim MAX77843 battery charger driver"
+	depends on MFD_MAX77843
+	help
+	  Say Y to enable support for the battery charger control sysfs and
+	  platform data of MAX77843
+
 config CHARGER_MAX8997
 	tristate "Maxim MAX8997/MAX8966 PMIC battery charger driver"
 	depends on MFD_MAX8997 && REGULATOR_MAX8997
diff --git a/drivers/power/Makefile b/drivers/power/Makefile
index dfa8942..212c6a2 100644
--- a/drivers/power/Makefile
+++ b/drivers/power/Makefile
@@ -50,6 +50,7 @@ obj-$(CONFIG_CHARGER_LP8788)	+= lp8788-charger.o
 obj-$(CONFIG_CHARGER_GPIO)	+= gpio-charger.o
 obj-$(CONFIG_CHARGER_MANAGER)	+= charger-manager.o
 obj-$(CONFIG_CHARGER_MAX14577)	+= max14577_charger.o
+obj-$(CONFIG_CHARGER_MAX77843)	+= max77843_charger.o
 obj-$(CONFIG_CHARGER_MAX8997)	+= max8997_charger.o
 obj-$(CONFIG_CHARGER_MAX8998)	+= max8998_charger.o
 obj-$(CONFIG_CHARGER_BQ2415X)	+= bq2415x_charger.o
diff --git a/drivers/power/max77843_charger.c b/drivers/power/max77843_charger.c
new file mode 100644
index 0000000..392eebc1a
--- /dev/null
+++ b/drivers/power/max77843_charger.c
@@ -0,0 +1,508 @@
+/*
+ * Charger driver for Maxim MAX77843
+ *
+ * Copyright (C) 2015 Samsung Electronics, Co., Ltd.
+ * Author: Beomho Seo <beomho.seo@...sung.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published bythe Free Software Foundation.
+ */
+
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/power_supply.h>
+#include <linux/mfd/max77843-private.h>
+
+struct max77843_charger_info {
+	u32 fast_charge_uamp;
+	u32 top_off_uamp;
+	u32 input_uamp_limit;
+};
+
+struct max77843_charger {
+	struct device		*dev;
+	struct max77843		*max77843;
+	struct i2c_client	*client;
+	struct regmap		*regmap;
+	struct power_supply	psy;
+
+	struct max77843_charger_info	*info;
+};
+
+static int max77843_charger_get_max_current(struct max77843_charger *charger)
+{
+	struct regmap *regmap = charger->regmap;
+	int ret, val = 0;
+	unsigned int reg_data;
+
+	ret = regmap_read(regmap, MAX77843_CHG_REG_CHG_CNFG_09, &reg_data);
+	if (ret) {
+		dev_err(charger->dev,
+			"Failed to read max current register: %d\n", ret);
+		return ret;
+	}
+
+	if (reg_data <= 0x03) {
+		val = MAX77843_CHG_INPUT_CURRENT_LIMIT_MIN;
+	} else if (reg_data >= 0x78) {
+		val = MAX77843_CHG_INPUT_CURRENT_LIMIT_MAX;
+	} else {
+		val = reg_data / 3;
+		if (reg_data % 3 == 0)
+			val *= 100000;
+		else if (reg_data % 3 == 1)
+			val = val * 100000 + 33000;
+		else
+			val = val * 100000 + 67000;
+	}
+
+	return val;
+}
+
+static int max77843_charger_get_now_current(struct max77843_charger *charger)
+{
+	struct regmap *regmap = charger->regmap;
+	int ret, val = 0;
+	unsigned int reg_data;
+
+	ret = regmap_read(regmap, MAX77843_CHG_REG_CHG_CNFG_02, &reg_data);
+	if (ret) {
+		dev_err(charger->dev,
+			"Failed to read charge current register: %d\n", ret);
+		return ret;
+	}
+
+	reg_data &= MAX77843_CHG_FAST_CHG_CURRENT_MASK;
+
+	if (reg_data <= 0x02)
+		val = MAX77843_CHG_FAST_CHG_CURRENT_MIN;
+	else if (reg_data >= 0x3f)
+		val = MAX77843_CHG_FAST_CHG_CURRENT_MAX;
+	else
+		val = reg_data * MAX77843_CHG_FAST_CHG_CURRENT_STEP;
+
+	return val;
+}
+
+static int max77843_charger_get_online(struct max77843_charger *charger)
+{
+	struct regmap *regmap = charger->regmap;
+	int ret, val = 0;
+	unsigned int reg_data;
+
+	ret = regmap_read(regmap, MAX77843_CHG_REG_CHG_INT_OK, &reg_data);
+	if (ret) {
+		dev_err(charger->dev,
+				"Failed to read charger status: %d\n", ret);
+		return ret;
+	}
+
+	if (reg_data & MAX77843_CHG_CHGIN_OK)
+		val = true;
+	else
+		val = false;
+
+	return val;
+}
+
+static int max77843_charger_get_present(struct max77843_charger *charger)
+{
+	struct regmap *regmap = charger->regmap;
+	int ret, val = 0;
+	unsigned int reg_data;
+
+	ret = regmap_read(regmap, MAX77843_CHG_REG_CHG_DTLS_00,	&reg_data);
+	if (ret) {
+		dev_err(charger->dev,
+				"Failed to read battery present: %d\n", ret);
+		return ret;
+	}
+
+	if (reg_data & MAX77843_CHG_BAT_DTLS)
+		val = false;
+	else
+		val = true;
+
+	return val;
+}
+
+static int max77843_charger_get_health(struct max77843_charger *charger)
+{
+	struct regmap *regmap = charger->regmap;
+	int ret, val = POWER_SUPPLY_HEALTH_UNKNOWN;
+	unsigned int reg_data;
+
+	ret = regmap_read(regmap, MAX77843_CHG_REG_CHG_DTLS_01,	&reg_data);
+	if (ret) {
+		dev_err(charger->dev,
+				"Failed to read battery health: %d\n", ret);
+		return ret;
+	}
+
+	reg_data &= MAX77843_CHG_BAT_DTLS_MASK;
+
+	switch (reg_data) {
+	case MAX77843_CHG_NO_BAT:
+		val = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
+		break;
+	case MAX77843_CHG_LOW_VOLT_BAT:
+	case MAX77843_CHG_OK_BAT:
+	case MAX77843_CHG_OK_LOW_VOLT_BAT:
+		val = POWER_SUPPLY_HEALTH_GOOD;
+		break;
+	case MAX77843_CHG_LONG_BAT_TIME:
+		val = POWER_SUPPLY_HEALTH_DEAD;
+		break;
+	case MAX77843_CHG_OVER_VOLT_BAT:
+	case MAX77843_CHG_OVER_CURRENT_BAT:
+		val = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
+		break;
+	default:
+		val = POWER_SUPPLY_HEALTH_UNKNOWN;
+		break;
+	}
+
+	return val;
+}
+
+static int max77843_charger_get_status(struct max77843_charger *charger)
+{
+	struct regmap *regmap = charger->regmap;
+	int ret, val = 0;
+	unsigned int reg_data;
+
+	ret = regmap_read(regmap, MAX77843_CHG_REG_CHG_DTLS_01,	&reg_data);
+	if (ret) {
+		dev_err(charger->dev,
+				"Failed to read charger status: %d\n", ret);
+		return ret;
+	}
+
+	reg_data &= MAX77843_CHG_DTLS_MASK;
+
+	switch (reg_data) {
+	case MAX77843_CHG_PQ_MODE:
+	case MAX77843_CHG_CC_MODE:
+	case MAX77843_CHG_CV_MODE:
+		val = POWER_SUPPLY_STATUS_CHARGING;
+		break;
+	case MAX77843_CHG_TO_MODE:
+	case MAX77843_CHG_DO_MODE:
+		val = POWER_SUPPLY_STATUS_FULL;
+		break;
+	case MAX77843_CHG_HT_MODE:
+	case MAX77843_CHG_TF_MODE:
+	case MAX77843_CHG_TS_MODE:
+		val = POWER_SUPPLY_STATUS_NOT_CHARGING;
+		break;
+	case MAX77843_CHG_OFF_MODE:
+		val = POWER_SUPPLY_STATUS_DISCHARGING;
+		break;
+	default:
+		val = POWER_SUPPLY_STATUS_UNKNOWN;
+		break;
+	}
+
+	return val;
+}
+
+static const char *model_name = "MAX77843";
+static const char *manufacturer = "Maxim Integrated";
+
+static int max77843_charger_get_property(struct power_supply *psy,
+		enum power_supply_property psp,
+		union power_supply_propval *val)
+{
+	struct max77843_charger *charger = container_of(psy,
+				struct max77843_charger, psy);
+
+	switch (psp) {
+	case POWER_SUPPLY_PROP_STATUS:
+		val->intval = max77843_charger_get_status(charger);
+		break;
+	case POWER_SUPPLY_PROP_HEALTH:
+		val->intval = max77843_charger_get_health(charger);
+		break;
+	case POWER_SUPPLY_PROP_PRESENT:
+		val->intval = max77843_charger_get_present(charger);
+		break;
+	case POWER_SUPPLY_PROP_ONLINE:
+		val->intval = max77843_charger_get_online(charger);
+		break;
+	case POWER_SUPPLY_PROP_CURRENT_NOW:
+		val->intval = max77843_charger_get_now_current(charger);
+		break;
+	case POWER_SUPPLY_PROP_CURRENT_MAX:
+		val->intval = max77843_charger_get_max_current(charger);
+		break;
+	case POWER_SUPPLY_PROP_MODEL_NAME:
+		val->strval =  model_name;
+		break;
+	case POWER_SUPPLY_PROP_MANUFACTURER:
+		val->strval = manufacturer;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static enum power_supply_property max77843_charger_props[] = {
+	POWER_SUPPLY_PROP_STATUS,
+	POWER_SUPPLY_PROP_HEALTH,
+	POWER_SUPPLY_PROP_PRESENT,
+	POWER_SUPPLY_PROP_ONLINE,
+	POWER_SUPPLY_PROP_CURRENT_NOW,
+	POWER_SUPPLY_PROP_CURRENT_MAX,
+	POWER_SUPPLY_PROP_MODEL_NAME,
+	POWER_SUPPLY_PROP_MANUFACTURER,
+};
+
+static int max77843_charger_init_current_limit(struct max77843_charger *charger)
+{
+	struct regmap *regmap = charger->regmap;
+	struct max77843_charger_info *info = charger->info;
+	unsigned int input_uamp_limit = info->input_uamp_limit;
+	int ret;
+	unsigned int reg_data, val;
+
+	ret = regmap_update_bits(regmap, MAX77843_CHG_REG_CHG_CNFG_02,
+			MAX77843_CHG_OTG_ILIMIT_MASK,
+			MAX77843_CHG_OTG_ILIMIT_900);
+	if (ret) {
+		dev_err(charger->dev,
+			"Failed to write OTG current limit: %d\n", ret);
+		return ret;
+	}
+
+	if (input_uamp_limit == MAX77843_CHG_INPUT_CURRENT_LIMIT_MIN) {
+		reg_data = 0x03;
+	} else if (input_uamp_limit == MAX77843_CHG_INPUT_CURRENT_LIMIT_MAX) {
+		reg_data = 0x78;
+	} else {
+		if (input_uamp_limit < MAX77843_CHG_INPUT_CURRENT_LIMIT_REF)
+			val = 0x03;
+		else
+			val = 0x02;
+
+		input_uamp_limit -= MAX77843_CHG_INPUT_CURRENT_LIMIT_MIN;
+		input_uamp_limit /= MAX77843_CHG_INPUT_CURRENT_LIMIT_STEP;
+		reg_data = val + input_uamp_limit;
+	}
+
+	ret = regmap_write(regmap, MAX77843_CHG_REG_CHG_CNFG_09, reg_data);
+	if (ret)
+		dev_err(charger->dev,
+			"Failed to write charge current limit: %d\n", ret);
+
+	return ret;
+}
+
+static int max77843_charger_init_top_off(struct max77843_charger *charger)
+{
+	struct regmap *regmap = charger->regmap;
+	struct max77843_charger_info *info = charger->info;
+	unsigned int top_off_uamp = info->top_off_uamp;
+	int ret;
+	unsigned int reg_data;
+
+	if (top_off_uamp == MAX77843_CHG_TOP_OFF_CURRENT_MIN) {
+		reg_data = 0x00;
+	} else if (top_off_uamp == MAX77843_CHG_TOP_OFF_CURRENT_MAX) {
+		reg_data = 0x07;
+	} else {
+		top_off_uamp -= MAX77843_CHG_TOP_OFF_CURRENT_MIN;
+		top_off_uamp /= MAX77843_CHG_TOP_OFF_CURRENT_STEP;
+		reg_data = top_off_uamp;
+	}
+
+	ret = regmap_update_bits(regmap, MAX77843_CHG_REG_CHG_CNFG_03,
+			MAX77843_CHG_TOP_OFF_CURRENT_MASK, reg_data);
+	if (ret)
+		dev_err(charger->dev,
+				"Failed to write top off current: %d\n", ret);
+
+	return ret;
+}
+
+static int max77843_charger_init_fast_charge(struct max77843_charger *charger)
+{
+	struct regmap *regmap = charger->regmap;
+	struct max77843_charger_info *info = charger->info;
+	unsigned int fast_charge_uamp = info->fast_charge_uamp;
+	int ret;
+	unsigned int reg_data;
+
+	if (fast_charge_uamp < info->input_uamp_limit) {
+		reg_data = 0x09;
+	} else if (fast_charge_uamp == MAX77843_CHG_FAST_CHG_CURRENT_MIN) {
+		reg_data = 0x02;
+	} else if (fast_charge_uamp == MAX77843_CHG_FAST_CHG_CURRENT_MAX) {
+		reg_data = 0x3f;
+	} else {
+		fast_charge_uamp -= MAX77843_CHG_FAST_CHG_CURRENT_MIN;
+		fast_charge_uamp /= MAX77843_CHG_FAST_CHG_CURRENT_STEP;
+		reg_data = 0x02 + fast_charge_uamp;
+	}
+
+	ret = regmap_update_bits(regmap, MAX77843_CHG_REG_CHG_CNFG_02,
+			MAX77843_CHG_FAST_CHG_CURRENT_MASK, reg_data);
+	if (ret)
+		dev_err(charger->dev,
+			"Failed to write fast charge current: %d\n", ret);
+
+	return ret;
+}
+
+static int max77843_charger_init(struct max77843_charger *charger)
+{
+	struct regmap *regmap = charger->regmap;
+	int ret;
+
+	ret = regmap_write(regmap, MAX77843_CHG_REG_CHG_CNFG_06,
+			MAX77843_CHG_WRITE_CAP_UNBLOCK);
+	if (ret) {
+		dev_err(charger->dev,
+			"Failed to unblock write capability: %d\n", ret);
+		return ret;
+	}
+
+	ret = regmap_write(regmap, MAX77843_CHG_REG_CHG_CNFG_01,
+			MAX77843_CHG_RESTART_THRESHOLD_DISABLE);
+	if (ret) {
+		dev_err(charger->dev,
+			"Failed to write charger restart threshold: %d\n", ret);
+		return ret;
+	}
+
+	ret = max77843_charger_init_fast_charge(charger);
+	if (ret) {
+		dev_err(charger->dev,
+				"Failed to set fast charge mode: %d\n", ret);
+		return ret;
+	}
+
+	ret = max77843_charger_init_top_off(charger);
+	if (ret) {
+		dev_err(charger->dev, "Failed to set top off charge mode.\n");
+		return ret;
+	}
+
+	ret = max77843_charger_init_current_limit(charger);
+	if (ret)
+		dev_err(charger->dev, "Faied to set current limit.\n");
+
+	return 0;
+}
+
+static struct max77843_charger_info *max77843_charger_dt_init(
+		struct platform_device *pdev)
+{
+	struct max77843_charger_info *info;
+	struct device_node *np = pdev->dev.of_node;
+	int ret;
+
+	if (!np) {
+		dev_err(&pdev->dev, "No charger OF node\n");
+		return ERR_PTR(-EINVAL);
+	}
+
+	info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
+	if (!info)
+		return ERR_PTR(-ENOMEM);
+
+	ret = of_property_read_u32(np, "maxim,fast-charge-uamp",
+			&info->fast_charge_uamp);
+	if (ret) {
+		dev_err(&pdev->dev, "Cannot parse fast charge current.\n");
+		return ERR_PTR(ret);
+	}
+
+	ret = of_property_read_u32(np, "maxim,top-off-uamp",
+			&info->top_off_uamp);
+	if (ret) {
+		dev_err(&pdev->dev,
+			"Cannot parse primary charger termination voltage.\n");
+		return ERR_PTR(ret);
+	}
+
+	ret = of_property_read_u32(np, "maxim,input-uamp-limit",
+			&info->input_uamp_limit);
+	if (ret) {
+		dev_err(&pdev->dev, "Cannot parse input current limit value\n");
+		return ERR_PTR(ret);
+	}
+
+	return info;
+}
+
+static int max77843_charger_probe(struct platform_device *pdev)
+{
+	struct max77843 *max77843 = dev_get_drvdata(pdev->dev.parent);
+	struct max77843_charger *charger;
+	int ret;
+
+	charger = devm_kzalloc(&pdev->dev, sizeof(*charger), GFP_KERNEL);
+	if (!charger)
+		return -ENOMEM;
+
+	platform_set_drvdata(pdev, charger);
+	charger->dev = &pdev->dev;
+	charger->max77843 = max77843;
+	charger->client = max77843->i2c_chg;
+	charger->regmap = max77843->regmap_chg;
+
+	charger->info = max77843_charger_dt_init(pdev);
+	if (IS_ERR_OR_NULL(charger->info))
+		return PTR_ERR(charger->info);
+
+	charger->psy.name	= "max77843-charger";
+	charger->psy.type	= POWER_SUPPLY_TYPE_MAINS;
+	charger->psy.get_property	= max77843_charger_get_property;
+	charger->psy.properties		= max77843_charger_props;
+	charger->psy.num_properties	= ARRAY_SIZE(max77843_charger_props);
+
+	ret = max77843_charger_init(charger);
+	if (ret)
+		return ret;
+
+	ret = power_supply_register(&pdev->dev, &charger->psy);
+	if (ret) {
+		dev_err(&pdev->dev,
+			"Failed to register power supply %d\n", ret);
+		return ret;
+	}
+
+	return 0;
+}
+
+static int max77843_charger_remove(struct platform_device *pdev)
+{
+	struct max77843_charger *charger = platform_get_drvdata(pdev);
+
+	power_supply_unregister(&charger->psy);
+
+	return 0;
+}
+
+static const struct platform_device_id max77843_charger_id[] = {
+	{ "max77843-charger", },
+	{ }
+};
+MODULE_DEVICE_TABLE(platform, max77843_charger_id);
+
+static struct platform_driver max77843_charger_driver = {
+	.driver = {
+		.name = "max77843-charger",
+	},
+	.probe = max77843_charger_probe,
+	.remove = max77843_charger_remove,
+	.id_table = max77843_charger_id,
+};
+module_platform_driver(max77843_charger_driver);
+
+MODULE_DESCRIPTION("Maxim MAX77843 charger driver");
+MODULE_AUTHOR("Beomho Seo <beomho.seo@...sung.com>");
+MODULE_LICENSE("GPL");
-- 
1.7.9.5

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