From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754169AbbAWFFW (ORCPT ); Fri, 23 Jan 2015 00:05:22 -0500 Received: from mailout2.samsung.com ([203.254.224.25]:14407 "EHLO mailout2.samsung.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752724AbbAWFDW (ORCPT ); Fri, 23 Jan 2015 00:03:22 -0500 X-AuditID: cbfee68d-f79296d000004278-5b-54c1d606971e From: Jaewon Kim To: linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, linux-pm@vger.kernel.org Cc: Inki Dae , Rob Herring , Pawel Moll , Mark Rutland , Ian Campbell , Kumar Gala , Lee Jones , Chanwoo Choi , Sebastian Reichel , Mark Brown , Beomho Seo Subject: [PATCH 4/6] power: max77843_battery: Add Max77843 fuel gauge device driver Date: Fri, 23 Jan 2015 14:02:45 +0900 Message-id: <1421989367-32721-5-git-send-email-jaewon02.kim@samsung.com> X-Mailer: git-send-email 1.7.9.5 In-reply-to: <1421989367-32721-1-git-send-email-jaewon02.kim@samsung.com> References: <1421989367-32721-1-git-send-email-jaewon02.kim@samsung.com> X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFmpnkeLIzCtJLcpLzFFi42JZI2JSrMt27WCIwdQHshanP21jt5j68Amb xfUvz1kt5h85x2rR/2Yhq8W5VysZLSbdn8Bicf/rUUaLy7vmsFl87j3CaLH0+kUmiwnT17JY tO49wm5xeneJA5/HmnlrGD0u9/Uyeaxc/oXNY9OqTjaPO9f2sHn0bVnF6PF5k1wAexSXTUpq TmZZapG+XQJXxsGNWgXnvCsm7P/D2sD4266LkZNDQsBE4u+BJewQtpjEhXvr2boYuTiEBJYy Sjw4O50dpuje42+sEInpjBK9HddZIJw2JomODwvBqtgEtCW+r1/MCmKLCERIPP+4khmkiFlg BrPEh487wIqEBUIl1m7dzgRiswioSix8uosZxOYV8JBYNWMCkM0BtE5BYs4kG5Awp4CnxLs9 L9hAbCGgktUTToItlhC4xy7xre0vM8QcAYlvkw+xQPTKSmw6wAxxtaTEwRU3WCYwCi9gZFjF KJpakFxQnJReZKhXnJhbXJqXrpecn7uJERg/p/89693BePuA9SFGAQ5GJR7ehi0HQ4RYE8uK K3MPMZoCbZjILCWanA+M0rySeENjMyMLUxNTYyNzSzMlcV5FqZ/BQgLpiSWp2ampBalF8UWl OanFhxiZODilGhhNfF6Idc0pM+O46XPST8Xni2To/EnPltn+ywg9vftUzzrGSNmbaVfv9N6K C7lrenT9uhrj/8v+lIvPcJxQfXzhZiN/mXfdn5+Xyp7+2xgY6Hvz6FsrQ1d325/LJqxjcvD9 nrGOV3qx5bOazDDhB1P4WsJye0Q+Mq69wTtr16+4szrL0yS2eG5TYinOSDTUYi4qTgQAVTuw s5oCAAA= X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFrrIIsWRmVeSWpSXmKPExsVy+t9jQV22awdDDL5tEbA4/Wkbu8XUh0/Y LK5/ec5qMf/IOVaL/jcLWS3OvVrJaDHp/gQWi/tfjzJaXN41h83ic+8RRoul1y8yWUyYvpbF onXvEXaL07tLHPg81sxbw+hxua+XyWPl8i9sHptWdbJ53Lm2h82jb8sqRo/Pm+QC2KMaGG0y UhNTUosUUvOS81My89JtlbyD453jTc0MDHUNLS3MlRTyEnNTbZVcfAJ03TJzgG5WUihLzCkF CgUkFhcr6dthmhAa4qZrAdMYoesbEgTXY2SABhLWMGYc3KhVcM67YsL+P6wNjL/tuhg5OSQE TCTuPf7GCmGLSVy4t56ti5GLQ0hgOqNEb8d1FginjUmi48NCdpAqNgFtie/rF4N1iAhESDz/ uJIZpIhZYAazxIePO8CKhAVCJdZu3c4EYrMIqEosfLqLGcTmFfCQWDVjApDNAbROQWLOJBuQ MKeAp8S7PS/YQGwhoJLVE06yTGDkXcDIsIpRNLUguaA4KT3XSK84Mbe4NC9dLzk/dxMjODqf Se9gXNVgcYhRgINRiYe3YcvBECHWxLLiytxDjBIczEoivE8OAIV4UxIrq1KL8uOLSnNSiw8x mgIdNZFZSjQ5H5g48kriDY1NzIwsjcwNLYyMzZXEeZXs20KEBNITS1KzU1MLUotg+pg4OKUa GLtFzlZtV919ft1OpXXbEwo/GEyQ9T2jtGfF3vyfTk+E2OYub2X6UfqeM/HFvlLV4julP9qW v1gScKV+2ZzsdZ9TF8k993joeVFuC2tTyuL0A+G/arfLHcucq9og9V7WydHh1gTBKWUdkzIv PZBXNWhjabl8rH75hCqJsLzNkdvVtv1iu/gyZY8SS3FGoqEWc1FxIgC3uEd15AIAAA== DLP-Filter: Pass X-MTR: 20000000000000000@CPGS X-CFilter-Loop: Reflected Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Beomho Seo 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 Signed-off-by: Beomho Seo --- drivers/power/Kconfig | 9 ++ drivers/power/Makefile | 1 + drivers/power/max77843_battery.c | 283 ++++++++++++++++++++++++++++++++++++++ 3 files changed, 293 insertions(+) create mode 100644 drivers/power/max77843_battery.c diff --git a/drivers/power/Kconfig b/drivers/power/Kconfig index a054a28..0039bbb 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 add support for battery fuel gauge in Maxim MAX77843. It is + fuel-gauge systems for lithuum-ion (Li+) batteries in handled and + portable devices. The MAX17040 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 212c6a2..ae0d795 100644 --- a/drivers/power/Makefile +++ b/drivers/power/Makefile @@ -33,6 +33,7 @@ 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-$(CONFIG_BATTERY_S3C_ADC) += s3c_adc_battery.o obj-$(CONFIG_BATTERY_TWL4030_MADC) += twl4030_madc_battery.o diff --git a/drivers/power/max77843_battery.c b/drivers/power/max77843_battery.c new file mode 100644 index 0000000..a08dd0c --- /dev/null +++ b/drivers/power/max77843_battery.c @@ -0,0 +1,283 @@ +/* + * Fuel gauge driver for Maxim MAX77843 + * + * Copyright (C) 2014 Samsung Electronics, Co., Ltd. + * Author: Beomho Seo + * + * 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 +#include +#include +#include + +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; + u8 reg_data[2]; + + ret = regmap_bulk_read(regmap, MAX77843_FG_REG_SOCREP, reg_data, 2); + if (ret) { + dev_err(battery->dev, "Failed to read fuelgauge register\n"); + return ret; + } + + val = ((reg_data[1] * 100) + (reg_data[0] * 100 / 256)) / 100; + + 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; + u8 reg_data[2]; + + 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_bulk_read(regmap, reg, reg_data, 2); + if (ret) { + dev_err(battery->dev, "Failed to read fuelgauge register\n"); + return ret; + } + + val = (reg_data[1] << 8) | reg_data[0]; + + 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; + u8 reg_data[2]; + + 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_bulk_read(regmap, reg, reg_data, 2); + if (ret) { + dev_err(battery->dev, "Failed to read fuelgauge register\n"); + return ret; + } + + val = (reg_data[1] << 8) | reg_data[0]; + 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; + u8 reg_data[2]; + + 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_bulk_read(regmap, reg, reg_data, 2); + if (ret) { + dev_err(battery->dev, "Failed to read fuelgauge register\n"); + return ret; + } + + val = ((reg_data[1] << 4) + (reg_data[0] >> 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 = 8, + .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); + + 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 "); +MODULE_LICENSE("GPL"); -- 1.7.9.5