drivers/power/max17042_battery.c - kernel/mindspeed - Git at Google

 /*
  * 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/module.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>

 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 void max17042_set_reg(struct i2c_client *client,
 			     struct max17042_reg_data *data, int size)
 {
 	int i;

 	for (i = 0; i < size; i++)
 		max17042_write_reg(client, data[i].addr, data[i].data);
 }

 static enum power_supply_property max17042_battery_props[] = {
 	POWER_SUPPLY_PROP_PRESENT,
 	POWER_SUPPLY_PROP_CYCLE_COUNT,
 	POWER_SUPPLY_PROP_VOLTAGE_MAX,
 	POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
 	POWER_SUPPLY_PROP_VOLTAGE_NOW,
 	POWER_SUPPLY_PROP_VOLTAGE_AVG,
 	POWER_SUPPLY_PROP_CAPACITY,
 	POWER_SUPPLY_PROP_CHARGE_FULL,
 	POWER_SUPPLY_PROP_TEMP,
 	POWER_SUPPLY_PROP_CURRENT_NOW,
 	POWER_SUPPLY_PROP_CURRENT_AVG,
 };

 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_PRESENT:
 		val->intval = max17042_read_reg(chip->client,
 				MAX17042_STATUS);
 		if (val->intval & MAX17042_STATUS_BattAbsent)
 			val->intval = 0;
 		else
 			val->intval = 1;
 		break;
 	case POWER_SUPPLY_PROP_CYCLE_COUNT:
 		val->intval = max17042_read_reg(chip->client,
 				MAX17042_Cycles);
 		break;
 	case POWER_SUPPLY_PROP_VOLTAGE_MAX:
 		val->intval = max17042_read_reg(chip->client,
 				MAX17042_MinMaxVolt);
 		val->intval >>= 8;
 		val->intval *= 20000; /* Units of LSB = 20mV */
 		break;
 	case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
 		val->intval = max17042_read_reg(chip->client,
 				MAX17042_V_empty);
 		val->intval >>= 7;
 		val->intval *= 10000; /* Units of LSB = 10mV */
 		break;
 	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;
 	case POWER_SUPPLY_PROP_CHARGE_FULL:
 		val->intval = max17042_read_reg(chip->client,
 				MAX17042_RepSOC);
 		if ((val->intval / 256) >= MAX17042_BATTERY_FULL)
 			val->intval = 1;
 		else if (val->intval >= 0)
 			val->intval = 0;
 		break;
 	case POWER_SUPPLY_PROP_TEMP:
 		val->intval = max17042_read_reg(chip->client,
 				MAX17042_TEMP);
 		/* The value is signed. */
 		if (val->intval & 0x8000) {
 			val->intval = (0x7fff & ~val->intval) + 1;
 			val->intval *= -1;
 		}
 		/* The value is converted into deci-centigrade scale */
 		/* Units of LSB = 1 / 256 degree Celsius */
 		val->intval = val->intval * 10 / 256;
 		break;
 	case POWER_SUPPLY_PROP_CURRENT_NOW:
 		if (chip->pdata->enable_current_sense) {
 			val->intval = max17042_read_reg(chip->client,
 					MAX17042_Current);
 			if (val->intval & 0x8000) {
 				/* Negative */
 				val->intval = ~val->intval & 0x7fff;
 				val->intval++;
 				val->intval *= -1;
 			}
 			val->intval >>= 4;
 			val->intval *= 1000000 * 25 / chip->pdata->r_sns;
 		} else {
 			return -EINVAL;
 		}
 		break;
 	case POWER_SUPPLY_PROP_CURRENT_AVG:
 		if (chip->pdata->enable_current_sense) {
 			val->intval = max17042_read_reg(chip->client,
 					MAX17042_AvgCurrent);
 			if (val->intval & 0x8000) {
 				/* Negative */
 				val->intval = ~val->intval & 0x7fff;
 				val->intval++;
 				val->intval *= -1;
 			}
 			val->intval *= 1562500 / chip->pdata->r_sns;
 		} else {
 			return -EINVAL;
 		}
 		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);

 	/* When current is not measured,
 	 * CURRENT_NOW and CURRENT_AVG properties should be invisible. */
 	if (!chip->pdata->enable_current_sense)
 		chip->battery.num_properties -= 2;

 	ret = power_supply_register(&client->dev, &chip->battery);
 	if (ret) {
 		dev_err(&client->dev, "failed: power supply register\n");
 		kfree(chip);
 		return ret;
 	}

 	/* Initialize registers according to values from the platform data */
 	if (chip->pdata->init_data)
 		max17042_set_reg(client, chip->pdata->init_data,
 				 chip->pdata->num_init_data);

 	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);
 	} else {
 		if (chip->pdata->r_sns == 0)
 			chip->pdata->r_sns = MAX17042_DEFAULT_SNS_RESISTOR;
 	}

 	return 0;
 }

 static int __devexit max17042_remove(struct i2c_client *client)
 {
 	struct max17042_chip *chip = i2c_get_clientdata(client);

 	power_supply_unregister(&chip->battery);
 	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");
	/*
	* 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/module.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>

	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 void max17042_set_reg(struct i2c_client *client,
	struct max17042_reg_data *data, int size)
	{
	int i;

	for (i = 0; i < size; i++)
	max17042_write_reg(client, data[i].addr, data[i].data);
	}

	static enum power_supply_property max17042_battery_props[] = {
	POWER_SUPPLY_PROP_PRESENT,
	POWER_SUPPLY_PROP_CYCLE_COUNT,
	POWER_SUPPLY_PROP_VOLTAGE_MAX,
	POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
	POWER_SUPPLY_PROP_VOLTAGE_NOW,
	POWER_SUPPLY_PROP_VOLTAGE_AVG,
	POWER_SUPPLY_PROP_CAPACITY,
	POWER_SUPPLY_PROP_CHARGE_FULL,
	POWER_SUPPLY_PROP_TEMP,
	POWER_SUPPLY_PROP_CURRENT_NOW,
	POWER_SUPPLY_PROP_CURRENT_AVG,
	};

	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_PRESENT:
	val->intval = max17042_read_reg(chip->client,
	MAX17042_STATUS);
	if (val->intval & MAX17042_STATUS_BattAbsent)
	val->intval = 0;
	else
	val->intval = 1;
	break;
	case POWER_SUPPLY_PROP_CYCLE_COUNT:
	val->intval = max17042_read_reg(chip->client,
	MAX17042_Cycles);
	break;
	case POWER_SUPPLY_PROP_VOLTAGE_MAX:
	val->intval = max17042_read_reg(chip->client,
	MAX17042_MinMaxVolt);
	val->intval >>= 8;
	val->intval = 20000; / Units of LSB = 20mV */
	break;
	case POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN:
	val->intval = max17042_read_reg(chip->client,
	MAX17042_V_empty);
	val->intval >>= 7;
	val->intval = 10000; / Units of LSB = 10mV */
	break;
	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;
	case POWER_SUPPLY_PROP_CHARGE_FULL:
	val->intval = max17042_read_reg(chip->client,
	MAX17042_RepSOC);
	if ((val->intval / 256) >= MAX17042_BATTERY_FULL)
	val->intval = 1;
	else if (val->intval >= 0)
	val->intval = 0;
	break;
	case POWER_SUPPLY_PROP_TEMP:
	val->intval = max17042_read_reg(chip->client,
	MAX17042_TEMP);
	/* The value is signed. */
	if (val->intval & 0x8000) {
	val->intval = (0x7fff & ~val->intval) + 1;
	val->intval *= -1;
	}
	/* The value is converted into deci-centigrade scale */
	/* Units of LSB = 1 / 256 degree Celsius */
	val->intval = val->intval * 10 / 256;
	break;
	case POWER_SUPPLY_PROP_CURRENT_NOW:
	if (chip->pdata->enable_current_sense) {
	val->intval = max17042_read_reg(chip->client,
	MAX17042_Current);
	if (val->intval & 0x8000) {
	/* Negative */
	val->intval = ~val->intval & 0x7fff;
	val->intval++;
	val->intval *= -1;
	}
	val->intval >>= 4;
	val->intval = 1000000 25 / chip->pdata->r_sns;
	} else {
	return -EINVAL;
	}
	break;
	case POWER_SUPPLY_PROP_CURRENT_AVG:
	if (chip->pdata->enable_current_sense) {
	val->intval = max17042_read_reg(chip->client,
	MAX17042_AvgCurrent);
	if (val->intval & 0x8000) {
	/* Negative */
	val->intval = ~val->intval & 0x7fff;
	val->intval++;
	val->intval *= -1;
	}
	val->intval *= 1562500 / chip->pdata->r_sns;
	} else {
	return -EINVAL;
	}
	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);

	/* When current is not measured,
	* CURRENT_NOW and CURRENT_AVG properties should be invisible. */
	if (!chip->pdata->enable_current_sense)
	chip->battery.num_properties -= 2;

	ret = power_supply_register(&client->dev, &chip->battery);
	if (ret) {
	dev_err(&client->dev, "failed: power supply register\n");
	kfree(chip);
	return ret;
	}

	/* Initialize registers according to values from the platform data */
	if (chip->pdata->init_data)
	max17042_set_reg(client, chip->pdata->init_data,
	chip->pdata->num_init_data);

	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);
	} else {
	if (chip->pdata->r_sns == 0)
	chip->pdata->r_sns = MAX17042_DEFAULT_SNS_RESISTOR;
	}

	return 0;
	}

	static int __devexit max17042_remove(struct i2c_client *client)
	{
	struct max17042_chip *chip = i2c_get_clientdata(client);

	power_supply_unregister(&chip->battery);
	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");