[PATCH v7 3/5] power: max77843_battery: Add Max77843 fuel gauge device driver

Jaewon Kim
2015-03-02T10:10:50Z

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

This patch adds device driver of max77843 fuel gauge.
The driver support for battery fuel gauge in Maxim Max77843.
It is fuel-gauge systems for lithuum-ion batteries in handled and
portable devices.

Cc: Sebastian Reichel <sre@kernel.org>
Signed-off-by: Beomho Seo <beomho.seo@samsung.com>
---
drivers/power/Kconfig | 9 ++
drivers/power/Makefile | 1 +
drivers/power/max77843_battery.c | 286 ++++++++++++++++++++++++++++++++++++++
3 files changed, 296 insertions(+)
create mode 100644 drivers/power/max77843_battery.c

diff --git a/drivers/power/Kconfig b/drivers/power/Kconfig
index 994793d..42538e6 100644
--- a/drivers/power/Kconfig
+++ b/drivers/power/Kconfig
@@ -212,6 +212,15 @@ config BATTERY_MAX17042
with MAX17042. This driver also supports max17047/50 chips which are
improved version of max17042.

+config BATTERY_MAX77843
+ tristate "Maxim MAX77843 Fuel Gauge"
+ depends on MFD_MAX77843
+ help
+ This adds support for battery fuel gauge in Maxim MAX77843. It is
+ fuel-gauge for a lithium-ion batteries with a single cell and can be
+ found in portable devices. The MAX77843 is configured to operate with
+ a single lithium cell.
+
config BATTERY_Z2
tristate "Z2 battery driver"
depends on I2C && MACH_ZIPIT2
diff --git a/drivers/power/Makefile b/drivers/power/Makefile
index ed69cea..59e3945 100644
--- a/drivers/power/Makefile
+++ b/drivers/power/Makefile
@@ -34,6 +34,7 @@ obj-$(CONFIG_BATTERY_DA9030) += da9030_battery.o
obj-$(CONFIG_BATTERY_DA9052) += da9052-battery.o
obj-$(CONFIG_BATTERY_MAX17040) += max17040_battery.o
obj-$(CONFIG_BATTERY_MAX17042) += max17042_battery.o
+obj-$(CONFIG_BATTERY_MAX77843) += max77843_battery.o
obj-$(CONFIG_BATTERY_Z2) += z2_battery.o
obj-$(CONFIG_BATTERY_RT5033) += rt5033_battery.o
obj-$(CONFIG_BATTERY_S3C_ADC) += s3c_adc_battery.o
diff --git a/drivers/power/max77843_battery.c b/drivers/power/max77843_battery.c
new file mode 100644
index 0000000..a4266de
--- /dev/null
+++ b/drivers/power/max77843_battery.c
@@ -0,0 +1,286 @@
+/*
+ * Fuel gauge 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_battery {
+ struct device *dev;
+ struct max77843 *max77843;
+ struct i2c_client *client;
+ struct regmap *regmap;
+ struct power_supply psy;
+};
+
+static int max77843_battery_get_capacity(struct max77843_battery *battery)
+{
+ struct regmap *regmap = battery->regmap;
+ int ret, val;
+ unsigned int reg_data;
+
+ ret = regmap_read(regmap, MAX77843_FG_REG_SOCREP, &reg_data);
+ if (ret) {
+ dev_err(battery->dev, "Failed to read fuelgauge register\n");
+ return ret;
+ }
+
+ val = reg_data >> 8;
+
+ return val;
+}
+
+static int max77843_battery_get_energy_prop(struct max77843_battery *battery,
+ enum power_supply_property psp)
+{
+ struct regmap *regmap = battery->regmap;
+ unsigned int reg;
+ int ret, val;
+ unsigned int reg_data;
+
+ switch (psp) {
+ case POWER_SUPPLY_PROP_ENERGY_FULL:
+ reg = MAX77843_FG_REG_FULLCAP;
+ break;
+ case POWER_SUPPLY_PROP_ENERGY_NOW:
+ reg = MAX77843_FG_REG_REMCAP_REP;
+ break;
+ case POWER_SUPPLY_PROP_ENERGY_AVG:
+ reg = MAX77843_FG_REG_REMCAP_AV;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ ret = regmap_read(regmap, reg, &reg_data);
+ if (ret) {
+ dev_err(battery->dev, "Failed to read fuelgauge register\n");
+ return ret;
+ }
+
+ val = reg_data;
+
+ return val;
+}
+
+static int max77843_battery_get_current_prop(struct max77843_battery *battery,
+ enum power_supply_property psp)
+{
+ struct regmap *regmap = battery->regmap;
+ unsigned int reg;
+ int ret, val;
+ unsigned int reg_data;
+
+ switch (psp) {
+ case POWER_SUPPLY_PROP_CURRENT_NOW:
+ reg = MAX77843_FG_REG_CURRENT;
+ break;
+ case POWER_SUPPLY_PROP_CURRENT_AVG:
+ reg = MAX77843_FG_REG_AVG_CURRENT;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ ret = regmap_read(regmap, reg, &reg_data);
+ if (ret) {
+ dev_err(battery->dev, "Failed to read fuelgauge register\n");
+ return ret;
+ }
+
+ val = reg_data;
+ if (val & 0x8000) {
+ /* Negative */
+ val = ~val & 0xffff;
+ val++;
+ val *= -1;
+ }
+ /* Unit of current is mA */
+ val = val * 15625 / 100000;
+
+ return val;
+}
+
+static int max77843_battery_get_voltage_prop(struct max77843_battery *battery,
+ enum power_supply_property psp)
+{
+ struct regmap *regmap = battery->regmap;
+ unsigned int reg;
+ int ret, val;
+ unsigned int reg_data;
+
+ switch (psp) {
+ case POWER_SUPPLY_PROP_VOLTAGE_NOW:
+ reg = MAX77843_FG_REG_VCELL;
+ break;
+ case POWER_SUPPLY_PROP_VOLTAGE_AVG:
+ reg = MAX77843_FG_REG_AVG_VCELL;
+ break;
+ case POWER_SUPPLY_PROP_VOLTAGE_OCV:
+ reg = MAX77843_FG_REG_OCV;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ ret = regmap_read(regmap, reg, &reg_data);
+ if (ret) {
+ dev_err(battery->dev, "Failed to read fuelgauge register\n");
+ return ret;
+ }
+
+ val = (reg_data >> 4) * 125;
+ val /= 100;
+
+ return val;
+}
+
+static const char *model_name = "MAX77843";
+static const char *manufacturer = "Maxim Integrated";
+
+static int max77843_battery_get_property(struct power_supply *psy,
+ enum power_supply_property psp,
+ union power_supply_propval *val)
+{
+ struct max77843_battery *battery = container_of(psy,
+ struct max77843_battery, psy);
+ switch (psp) {
+ case POWER_SUPPLY_PROP_VOLTAGE_NOW:
+ case POWER_SUPPLY_PROP_VOLTAGE_AVG:
+ case POWER_SUPPLY_PROP_VOLTAGE_OCV:
+ val->intval = max77843_battery_get_voltage_prop(battery, psp);
+ break;
+ case POWER_SUPPLY_PROP_CURRENT_NOW:
+ case POWER_SUPPLY_PROP_CURRENT_AVG:
+ val->intval = max77843_battery_get_current_prop(battery, psp);
+ break;
+ case POWER_SUPPLY_PROP_ENERGY_FULL:
+ case POWER_SUPPLY_PROP_ENERGY_NOW:
+ case POWER_SUPPLY_PROP_ENERGY_AVG:
+ val->intval = max77843_battery_get_energy_prop(battery, psp);
+ break;
+ case POWER_SUPPLY_PROP_CAPACITY:
+ val->intval = max77843_battery_get_capacity(battery);
+ 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_battery_props[] = {
+ POWER_SUPPLY_PROP_VOLTAGE_NOW,
+ POWER_SUPPLY_PROP_VOLTAGE_AVG,
+ POWER_SUPPLY_PROP_VOLTAGE_OCV,
+ POWER_SUPPLY_PROP_CURRENT_NOW,
+ POWER_SUPPLY_PROP_CURRENT_AVG,
+ POWER_SUPPLY_PROP_ENERGY_FULL,
+ POWER_SUPPLY_PROP_ENERGY_NOW,
+ POWER_SUPPLY_PROP_ENERGY_AVG,
+ POWER_SUPPLY_PROP_CAPACITY,
+ POWER_SUPPLY_PROP_MODEL_NAME,
+ POWER_SUPPLY_PROP_MANUFACTURER,
+};
+
+static const struct regmap_config max77843_fuel_regmap_config = {
+ .reg_bits = 8,
+ .val_bits = 16,
+ .val_format_endian = REGMAP_ENDIAN_NATIVE,
+ .max_register = MAX77843_FG_END,
+};
+
+static int max77843_battery_probe(struct platform_device *pdev)
+{
+ struct max77843 *max77843 = dev_get_drvdata(pdev->dev.parent);
+ struct max77843_battery *battery;
+ int ret;
+
+ battery = devm_kzalloc(&pdev->dev, sizeof(*battery), GFP_KERNEL);
+ if (!battery)
+ return -ENOMEM;
+
+ battery->dev = &pdev->dev;
+ battery->max77843 = max77843;
+
+ battery->client = i2c_new_dummy(max77843->i2c->adapter, I2C_ADDR_FG);
+ if (!battery->client) {
+ dev_err(&pdev->dev, "Failed to get dummy i2c client.\n");
+ return PTR_ERR(battery->client);
+ }
+ i2c_set_clientdata(battery->client, max77843);
+
+ battery->regmap = devm_regmap_init_i2c(battery->client,
+ &max77843_fuel_regmap_config);
+ if (IS_ERR(battery->regmap)) {
+ ret = PTR_ERR(battery->regmap);
+ goto err_i2c;
+ }
+
+ platform_set_drvdata(pdev, battery);
+
+ battery->psy.name = "max77843-fuelgauge";
+ battery->psy.type = POWER_SUPPLY_TYPE_BATTERY;
+ battery->psy.get_property = max77843_battery_get_property;
+ battery->psy.properties = max77843_battery_props;
+ battery->psy.num_properties = ARRAY_SIZE(max77843_battery_props);
+
+ ret = power_supply_register(&pdev->dev, &battery->psy);
+ if (ret) {
+ dev_err(&pdev->dev, "Failed to register power supply\n");
+ goto err_i2c;
+ }
+
+ return 0;
+
+err_i2c:
+ i2c_unregister_device(battery->client);
+
+ return ret;
+}
+
+static int max77843_battery_remove(struct platform_device *pdev)
+{
+ struct max77843_battery *battery = platform_get_drvdata(pdev);
+
+ power_supply_unregister(&battery->psy);
+
+ i2c_unregister_device(battery->client);
+
+ return 0;
+}
+
+static const struct platform_device_id max77843_battery_id[] = {
+ { "max77843-fuelgauge", },
+ { }
+};
+MODULE_DEVICE_TABLE(platform, max77843_battery_id);
+
+static struct platform_driver max77843_battery_driver = {
+ .driver = {
+ .name = "max77843-fuelgauge",
+ },
+ .probe = max77843_battery_probe,
+ .remove = max77843_battery_remove,
+ .id_table = max77843_battery_id,
+};
+module_platform_driver(max77843_battery_driver);
+
+MODULE_DESCRIPTION("Maxim MAX77843 fuel gauge driver");
+MODULE_AUTHOR("Beomho Seo <beomho.seo@samsung.com>");
+MODULE_LICENSE("GPL v2");
--
1.7.9.5