[PATCH v8 1/2] power: max77843_charger: Add Max77843 charger device driver

Beomho Seo
2015-03-31T13:23:47Z

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@kernel.org>
Cc: Lee Jones <lee.jones@linaro.org>
Reviewed-by: Sebastian Reichel <sre@kernel.org>
Signed-off-by: Beomho Seo <beomho.seo@samsung.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 27b751b..994793d 100644
--- a/drivers/power/Kconfig
+++ b/drivers/power/Kconfig
@@ -337,6 +337,13 @@ config CHARGER_MAX77693
help
Say Y to enable support for the Maxim MAX77693 battery charger.

+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 36f9e0d..ed69cea 100644
--- a/drivers/power/Makefile
+++ b/drivers/power/Makefile
@@ -53,6 +53,7 @@ obj-$(CONFIG_CHARGER_GPIO) += gpio-charger.o
obj-$(CONFIG_CHARGER_MANAGER) += charger-manager.o
obj-$(CONFIG_CHARGER_MAX14577) += max14577_charger.o
obj-$(CONFIG_CHARGER_MAX77693) += max77693_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..d4cce17
--- /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@samsung.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 by the 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@samsung.com>");
+MODULE_LICENSE("GPL v2");
--
1.7.9.5