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

Message ID	1425291038-18269-4-git-send-email-jaewon02.kim@samsung.com (mailing list archive)
State	New, archived
Headers	show Return-Path: <linux-input-owner@kernel.org> From: Jaewon Kim <jaewon02.kim@samsung.com> To: linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, linux-pm@vger.kernel.org, linux-input@vger.kernel.org Cc: Inki Dae <inki.dae@samsung.com>, SangBae Lee <sangbae90.lee@samsung.com>, Rob Herring <robh+dt@kernel.org>, Pawel Moll <pawel.moll@arm.com>, Mark Rutland <mark.rutland@arm.com>, Ian Campbell <ijc+devicetree@hellion.org.uk>, Kumar Gala <galak@codeaurora.org>, Lee Jones <lee.jones@linaro.org>, Chanwoo Choi <cw00.choi@samsung.com>, Sebastian Reichel <sre@kernel.org>, Beomho Seo <beomho.seo@samsung.com>, Jaewon Kim <jaewon02.kim@samsung.com>, Dmitry Torokhov <dmitry.torokhov@gmail.com> Subject: [PATCH v7 3/5] power: max77843_battery: Add Max77843 fuel gauge device driver Date: Mon, 02 Mar 2015 19:10:36 +0900 Message-id: <1425291038-18269-4-git-send-email-jaewon02.kim@samsung.com> In-reply-to: <1425291038-18269-1-git-send-email-jaewon02.kim@samsung.com> References: <1425291038-18269-1-git-send-email-jaewon02.kim@samsung.com> DLP-Filter: Pass Sender: linux-input-owner@vger.kernel.org Precedence: bulk

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");

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

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