/* * Fuel gauge driver for Maxim 17042 / 8966 / 8997 * Note that Maxim 8966 and 8997 are mfd and this is its subdevice. * * Copyright (C) 2011 Samsung Electronics * MyungJoo Ham <myungjoo.ham@samsung.com> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA * * This driver is based on max17040_battery.c */ #include <linux/init.h> #include <linux/slab.h> #include <linux/i2c.h> #include <linux/mod_devicetable.h> #include <linux/power_supply.h> #include <linux/power/max17042_battery.h> enum max17042_register { MAX17042_STATUS = 0x00, MAX17042_VALRT_Th = 0x01, MAX17042_TALRT_Th = 0x02, MAX17042_SALRT_Th = 0x03, MAX17042_AtRate = 0x04, MAX17042_RepCap = 0x05, MAX17042_RepSOC = 0x06, MAX17042_Age = 0x07, MAX17042_TEMP = 0x08, MAX17042_VCELL = 0x09, MAX17042_Current = 0x0A, MAX17042_AvgCurrent = 0x0B, MAX17042_Qresidual = 0x0C, MAX17042_SOC = 0x0D, MAX17042_AvSOC = 0x0E, MAX17042_RemCap = 0x0F, MAX17402_FullCAP = 0x10, MAX17042_TTE = 0x11, MAX17042_V_empty = 0x12, MAX17042_RSLOW = 0x14, MAX17042_AvgTA = 0x16, MAX17042_Cycles = 0x17, MAX17042_DesignCap = 0x18, MAX17042_AvgVCELL = 0x19, MAX17042_MinMaxTemp = 0x1A, MAX17042_MinMaxVolt = 0x1B, MAX17042_MinMaxCurr = 0x1C, MAX17042_CONFIG = 0x1D, MAX17042_ICHGTerm = 0x1E, MAX17042_AvCap = 0x1F, MAX17042_ManName = 0x20, MAX17042_DevName = 0x21, MAX17042_DevChem = 0x22, MAX17042_TempNom = 0x24, MAX17042_TempCold = 0x25, MAX17042_TempHot = 0x26, MAX17042_AIN = 0x27, MAX17042_LearnCFG = 0x28, MAX17042_SHFTCFG = 0x29, MAX17042_RelaxCFG = 0x2A, MAX17042_MiscCFG = 0x2B, MAX17042_TGAIN = 0x2C, MAx17042_TOFF = 0x2D, MAX17042_CGAIN = 0x2E, MAX17042_COFF = 0x2F, MAX17042_Q_empty = 0x33, MAX17042_T_empty = 0x34, MAX17042_RCOMP0 = 0x38, MAX17042_TempCo = 0x39, MAX17042_Rx = 0x3A, MAX17042_T_empty0 = 0x3B, MAX17042_TaskPeriod = 0x3C, MAX17042_FSTAT = 0x3D, MAX17042_SHDNTIMER = 0x3F, MAX17042_VFRemCap = 0x4A, MAX17042_QH = 0x4D, MAX17042_QL = 0x4E, }; struct max17042_chip { struct i2c_client *client; struct power_supply battery; struct max17042_platform_data *pdata; }; static int max17042_write_reg(struct i2c_client *client, u8 reg, u16 value) { int ret = i2c_smbus_write_word_data(client, reg, value); if (ret < 0) dev_err(&client->dev, "%s: err %d\n", __func__, ret); return ret; } static int max17042_read_reg(struct i2c_client *client, u8 reg) { int ret = i2c_smbus_read_word_data(client, reg); if (ret < 0) dev_err(&client->dev, "%s: err %d\n", __func__, ret); return ret; } static enum power_supply_property max17042_battery_props[] = { POWER_SUPPLY_PROP_VOLTAGE_NOW, POWER_SUPPLY_PROP_VOLTAGE_AVG, POWER_SUPPLY_PROP_CAPACITY, }; static int max17042_get_property(struct power_supply *psy, enum power_supply_property psp, union power_supply_propval *val) { struct max17042_chip *chip = container_of(psy, struct max17042_chip, battery); switch (psp) { case POWER_SUPPLY_PROP_VOLTAGE_NOW: val->intval = max17042_read_reg(chip->client, MAX17042_VCELL) * 83; /* 1000 / 12 = 83 */ break; case POWER_SUPPLY_PROP_VOLTAGE_AVG: val->intval = max17042_read_reg(chip->client, MAX17042_AvgVCELL) * 83; break; case POWER_SUPPLY_PROP_CAPACITY: val->intval = max17042_read_reg(chip->client, MAX17042_SOC) / 256; break; default: return -EINVAL; } return 0; } static int __devinit max17042_probe(struct i2c_client *client, const struct i2c_device_id *id) { struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent); struct max17042_chip *chip; int ret; if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA)) return -EIO; chip = kzalloc(sizeof(*chip), GFP_KERNEL); if (!chip) return -ENOMEM; chip->client = client; chip->pdata = client->dev.platform_data; i2c_set_clientdata(client, chip); chip->battery.name = "max17042_battery"; chip->battery.type = POWER_SUPPLY_TYPE_BATTERY; chip->battery.get_property = max17042_get_property; chip->battery.properties = max17042_battery_props; chip->battery.num_properties = ARRAY_SIZE(max17042_battery_props); ret = power_supply_register(&client->dev, &chip->battery); if (ret) { dev_err(&client->dev, "failed: power supply register\n"); i2c_set_clientdata(client, NULL); kfree(chip); return ret; } if (!chip->pdata->enable_current_sense) { max17042_write_reg(client, MAX17042_CGAIN, 0x0000); max17042_write_reg(client, MAX17042_MiscCFG, 0x0003); max17042_write_reg(client, MAX17042_LearnCFG, 0x0007); } return 0; } static int __devexit max17042_remove(struct i2c_client *client) { struct max17042_chip *chip = i2c_get_clientdata(client); power_supply_unregister(&chip->battery); i2c_set_clientdata(client, NULL); kfree(chip); return 0; } static const struct i2c_device_id max17042_id[] = { { "max17042", 0 }, { } }; MODULE_DEVICE_TABLE(i2c, max17042_id); static struct i2c_driver max17042_i2c_driver = { .driver = { .name = "max17042", }, .probe = max17042_probe, .remove = __devexit_p(max17042_remove), .id_table = max17042_id, }; static int __init max17042_init(void) { return i2c_add_driver(&max17042_i2c_driver); } module_init(max17042_init); static void __exit max17042_exit(void) { i2c_del_driver(&max17042_i2c_driver); } module_exit(max17042_exit); MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>"); MODULE_DESCRIPTION("MAX17042 Fuel Gauge"); MODULE_LICENSE("GPL");