Commit fef37e9a authored by Renata Sayakhova's avatar Renata Sayakhova Committed by Greg Kroah-Hartman
Browse files

DS2781 Maxim Stand-Alone Fuel Gauge battery and w1 slave drivers 



Signed-off-by: default avatarRenata Sayakhova <rsayakhova@gmail.com>
Acked-by: default avatarEvgeniy Polyakov <zbr@ioremap.net>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent f6e8a1d7

drivers/power/Kconfig

+14 −0
Original line number Diff line number Diff line
@@ -76,6 +76,20 @@ config BATTERY_DS2780 
	help

	  Say Y here to enable support for batteries with ds2780 chip.



config BATTERY_DS2781

	tristate "2781 battery driver"

	depends on HAS_IOMEM

	select W1

	select W1_SLAVE_DS2781

	help

	  If you enable this you will have the DS2781 battery driver support.



	  The battery monitor chip is used in many batteries/devices

	  as the one who is responsible for charging/discharging/monitoring

	  Li+ batteries.



	  If you are unsure, say N.



config BATTERY_DS2782

	tristate "DS2782/DS2786 standalone gas-gauge"

	depends on I2C

drivers/power/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -16,6 +16,7 @@ obj-$(CONFIG_TEST_POWER) += test_power.o 


obj-$(CONFIG_BATTERY_DS2760)	+= ds2760_battery.o

obj-$(CONFIG_BATTERY_DS2780)	+= ds2780_battery.o

obj-$(CONFIG_BATTERY_DS2781)	+= ds2781_battery.o

obj-$(CONFIG_BATTERY_DS2782)	+= ds2782_battery.o

obj-$(CONFIG_BATTERY_PMU)	+= pmu_battery.o

obj-$(CONFIG_BATTERY_OLPC)	+= olpc_battery.o

drivers/power/ds2781_battery.c

0 → 100644
+874 −0
Original line number Diff line number Diff line 
/*

 * 1-wire client/driver for the Maxim/Dallas DS2781 Stand-Alone Fuel Gauge IC

 *

 * Author: Renata Sayakhova <renata@oktetlabs.ru>

 *

 * Based on ds2780_battery drivers

 *

 * 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/slab.h>

#include <linux/param.h>

#include <linux/pm.h>

#include <linux/platform_device.h>

#include <linux/power_supply.h>

#include <linux/idr.h>



#include "../w1/w1.h"

#include "../w1/slaves/w1_ds2781.h"



/* Current unit measurement in uA for a 1 milli-ohm sense resistor */

#define DS2781_CURRENT_UNITS	1563

/* Charge unit measurement in uAh for a 1 milli-ohm sense resistor */

#define DS2781_CHARGE_UNITS		6250

/* Number of bytes in user EEPROM space */

#define DS2781_USER_EEPROM_SIZE		(DS2781_EEPROM_BLOCK0_END - \

					DS2781_EEPROM_BLOCK0_START + 1)

/* Number of bytes in parameter EEPROM space */

#define DS2781_PARAM_EEPROM_SIZE	(DS2781_EEPROM_BLOCK1_END - \

					DS2781_EEPROM_BLOCK1_START + 1)



struct ds2781_device_info {

	struct device *dev;

	struct power_supply bat;

	struct device *w1_dev;

	struct task_struct *mutex_holder;

};



enum current_types {

	CURRENT_NOW,

	CURRENT_AVG,

};



static const char model[] = "DS2781";

static const char manufacturer[] = "Maxim/Dallas";



static inline struct ds2781_device_info *

to_ds2781_device_info(struct power_supply *psy)

{

	return container_of(psy, struct ds2781_device_info, bat);

}



static inline struct power_supply *to_power_supply(struct device *dev)

{

	return dev_get_drvdata(dev);

}



static inline int ds2781_battery_io(struct ds2781_device_info *dev_info,

	char *buf, int addr, size_t count, int io)

{

	if (dev_info->mutex_holder == current)

		return w1_ds2781_io_nolock(dev_info->w1_dev, buf, addr,

				count, io);

	else

		return w1_ds2781_io(dev_info->w1_dev, buf, addr, count, io);

}



int w1_ds2781_read(struct ds2781_device_info *dev_info, char *buf,

		int addr, size_t count)

{

	return ds2781_battery_io(dev_info, buf, addr, count, 0);

}



static inline int ds2781_read8(struct ds2781_device_info *dev_info, u8 *val,

	int addr)

{

	return ds2781_battery_io(dev_info, val, addr, sizeof(u8), 0);

}



static int ds2781_read16(struct ds2781_device_info *dev_info, s16 *val,

	int addr)

{

	int ret;

	u8 raw[2];



	ret = ds2781_battery_io(dev_info, raw, addr, sizeof(raw), 0);

	if (ret < 0)

		return ret;



	*val = (raw[0] << 8) | raw[1];



	return 0;

}



static inline int ds2781_read_block(struct ds2781_device_info *dev_info,

	u8 *val, int addr, size_t count)

{

	return ds2781_battery_io(dev_info, val, addr, count, 0);

}



static inline int ds2781_write(struct ds2781_device_info *dev_info, u8 *val,

	int addr, size_t count)

{

	return ds2781_battery_io(dev_info, val, addr, count, 1);

}



static inline int ds2781_store_eeprom(struct device *dev, int addr)

{

	return w1_ds2781_eeprom_cmd(dev, addr, W1_DS2781_COPY_DATA);

}



static inline int ds2781_recall_eeprom(struct device *dev, int addr)

{

	return w1_ds2781_eeprom_cmd(dev, addr, W1_DS2781_RECALL_DATA);

}



static int ds2781_save_eeprom(struct ds2781_device_info *dev_info, int reg)

{

	int ret;



	ret = ds2781_store_eeprom(dev_info->w1_dev, reg);

	if (ret < 0)

		return ret;



	ret = ds2781_recall_eeprom(dev_info->w1_dev, reg);

	if (ret < 0)

		return ret;



	return 0;

}



/* Set sense resistor value in mhos */

static int ds2781_set_sense_register(struct ds2781_device_info *dev_info,

	u8 conductance)

{

	int ret;



	ret = ds2781_write(dev_info, &conductance,

				DS2781_RSNSP, sizeof(u8));

	if (ret < 0)

		return ret;



	return ds2781_save_eeprom(dev_info, DS2781_RSNSP);

}



/* Get RSGAIN value from 0 to 1.999 in steps of 0.001 */

static int ds2781_get_rsgain_register(struct ds2781_device_info *dev_info,

	u16 *rsgain)

{

	return ds2781_read16(dev_info, rsgain, DS2781_RSGAIN_MSB);

}



/* Set RSGAIN value from 0 to 1.999 in steps of 0.001 */

static int ds2781_set_rsgain_register(struct ds2781_device_info *dev_info,

	u16 rsgain)

{

	int ret;

	u8 raw[] = {rsgain >> 8, rsgain & 0xFF};



	ret = ds2781_write(dev_info, raw,

				DS2781_RSGAIN_MSB, sizeof(raw));

	if (ret < 0)

		return ret;



	return ds2781_save_eeprom(dev_info, DS2781_RSGAIN_MSB);

}



static int ds2781_get_voltage(struct ds2781_device_info *dev_info,

	int *voltage_uV)

{

	int ret;

	char val[2];

	int voltage_raw;



	ret = w1_ds2781_read(dev_info, val, DS2781_VOLT_MSB, 2 * sizeof(u8));

	if (ret < 0)

		return ret;

	/*

	 * The voltage value is located in 10 bits across the voltage MSB

	 * and LSB registers in two's compliment form

	 * Sign bit of the voltage value is in bit 7 of the voltage MSB register

	 * Bits 9 - 3 of the voltage value are in bits 6 - 0 of the

	 * voltage MSB register

	 * Bits 2 - 0 of the voltage value are in bits 7 - 5 of the

	 * voltage LSB register

	 */

	voltage_raw = (val[0] << 3) |

		(val[1] >> 5);



	/* DS2781 reports voltage in units of 9.76mV, but the battery class

	 * reports in units of uV, so convert by multiplying by 9760. */

	*voltage_uV = voltage_raw * 9760;



	return 0;

}



static int ds2781_get_temperature(struct ds2781_device_info *dev_info,

	int *temp)

{

	int ret;

	char val[2];

	int temp_raw;



	ret = w1_ds2781_read(dev_info, val, DS2781_TEMP_MSB, 2 * sizeof(u8));

	if (ret < 0)

		return ret;

	/*

	 * The temperature value is located in 10 bits across the temperature

	 * MSB and LSB registers in two's compliment form

	 * Sign bit of the temperature value is in bit 7 of the temperature

	 * MSB register

	 * Bits 9 - 3 of the temperature value are in bits 6 - 0 of the

	 * temperature MSB register

	 * Bits 2 - 0 of the temperature value are in bits 7 - 5 of the

	 * temperature LSB register

	 */

	temp_raw = ((val[0]) << 3) |

		(val[1] >> 5);

	*temp = temp_raw + (temp_raw / 4);



	return 0;

}



static int ds2781_get_current(struct ds2781_device_info *dev_info,

	enum current_types type, int *current_uA)

{

	int ret, sense_res;

	s16 current_raw;

	u8 sense_res_raw, reg_msb;



	/*

	 * The units of measurement for current are dependent on the value of

	 * the sense resistor.

	 */

	ret = ds2781_read8(dev_info, &sense_res_raw, DS2781_RSNSP);

	if (ret < 0)

		return ret;



	if (sense_res_raw == 0) {

		dev_err(dev_info->dev, "sense resistor value is 0\n");

		return -EINVAL;

	}

	sense_res = 1000 / sense_res_raw;



	if (type == CURRENT_NOW)

		reg_msb = DS2781_CURRENT_MSB;

	else if (type == CURRENT_AVG)

		reg_msb = DS2781_IAVG_MSB;

	else

		return -EINVAL;



	/*

	 * The current value is located in 16 bits across the current MSB

	 * and LSB registers in two's compliment form

	 * Sign bit of the current value is in bit 7 of the current MSB register

	 * Bits 14 - 8 of the current value are in bits 6 - 0 of the current

	 * MSB register

	 * Bits 7 - 0 of the current value are in bits 7 - 0 of the current

	 * LSB register

	 */

	ret = ds2781_read16(dev_info, &current_raw, reg_msb);

	if (ret < 0)

		return ret;



	*current_uA = current_raw * (DS2781_CURRENT_UNITS / sense_res);

	return 0;

}



static int ds2781_get_accumulated_current(struct ds2781_device_info *dev_info,

	int *accumulated_current)

{

	int ret, sense_res;

	s16 current_raw;

	u8 sense_res_raw;



	/*

	 * The units of measurement for accumulated current are dependent on

	 * the value of the sense resistor.

	 */

	ret = ds2781_read8(dev_info, &sense_res_raw, DS2781_RSNSP);

	if (ret < 0)

		return ret;



	if (sense_res_raw == 0) {

		dev_err(dev_info->dev, "sense resistor value is 0\n");

		return -EINVAL;

	}

	sense_res = 1000 / sense_res_raw;



	/*

	 * The ACR value is located in 16 bits across the ACR MSB and

	 * LSB registers

	 * Bits 15 - 8 of the ACR value are in bits 7 - 0 of the ACR

	 * MSB register

	 * Bits 7 - 0 of the ACR value are in bits 7 - 0 of the ACR

	 * LSB register

	 */

	ret = ds2781_read16(dev_info, &current_raw, DS2781_ACR_MSB);

	if (ret < 0)

		return ret;



	*accumulated_current = current_raw * (DS2781_CHARGE_UNITS / sense_res);

	return 0;

}



static int ds2781_get_capacity(struct ds2781_device_info *dev_info,

	int *capacity)

{

	int ret;

	u8 raw;



	ret = ds2781_read8(dev_info, &raw, DS2781_RARC);

	if (ret < 0)

		return ret;



	*capacity = raw;

	return 0;

}



static int ds2781_get_status(struct ds2781_device_info *dev_info, int *status)

{

	int ret, current_uA, capacity;



	ret = ds2781_get_current(dev_info, CURRENT_NOW, &current_uA);

	if (ret < 0)

		return ret;



	ret = ds2781_get_capacity(dev_info, &capacity);

	if (ret < 0)

		return ret;



	if (power_supply_am_i_supplied(&dev_info->bat)) {

		if (capacity == 100)

			*status = POWER_SUPPLY_STATUS_FULL;

		else if (current_uA > 50000)

			*status = POWER_SUPPLY_STATUS_CHARGING;

		else

			*status = POWER_SUPPLY_STATUS_NOT_CHARGING;

	} else {

		*status = POWER_SUPPLY_STATUS_DISCHARGING;

	}

	return 0;

}



static int ds2781_get_charge_now(struct ds2781_device_info *dev_info,

	int *charge_now)

{

	int ret;

	u16 charge_raw;



	/*

	 * The RAAC value is located in 16 bits across the RAAC MSB and

	 * LSB registers

	 * Bits 15 - 8 of the RAAC value are in bits 7 - 0 of the RAAC

	 * MSB register

	 * Bits 7 - 0 of the RAAC value are in bits 7 - 0 of the RAAC

	 * LSB register

	 */

	ret = ds2781_read16(dev_info, &charge_raw, DS2781_RAAC_MSB);

	if (ret < 0)

		return ret;



	*charge_now = charge_raw * 1600;

	return 0;

}



static int ds2781_get_control_register(struct ds2781_device_info *dev_info,

	u8 *control_reg)

{

	return ds2781_read8(dev_info, control_reg, DS2781_CONTROL);

}



static int ds2781_set_control_register(struct ds2781_device_info *dev_info,

	u8 control_reg)

{

	int ret;



	ret = ds2781_write(dev_info, &control_reg,

				DS2781_CONTROL, sizeof(u8));

	if (ret < 0)

		return ret;



	return ds2781_save_eeprom(dev_info, DS2781_CONTROL);

}



static int ds2781_battery_get_property(struct power_supply *psy,

	enum power_supply_property psp,

	union power_supply_propval *val)

{

	int ret = 0;

	struct ds2781_device_info *dev_info = to_ds2781_device_info(psy);



	switch (psp) {

	case POWER_SUPPLY_PROP_VOLTAGE_NOW:

		ret = ds2781_get_voltage(dev_info, &val->intval);

		break;



	case POWER_SUPPLY_PROP_TEMP:

		ret = ds2781_get_temperature(dev_info, &val->intval);

		break;



	case POWER_SUPPLY_PROP_MODEL_NAME:

		val->strval = model;

		break;



	case POWER_SUPPLY_PROP_MANUFACTURER:

		val->strval = manufacturer;

		break;



	case POWER_SUPPLY_PROP_CURRENT_NOW:

		ret = ds2781_get_current(dev_info, CURRENT_NOW, &val->intval);

		break;



	case POWER_SUPPLY_PROP_CURRENT_AVG:

		ret = ds2781_get_current(dev_info, CURRENT_AVG, &val->intval);

		break;



	case POWER_SUPPLY_PROP_STATUS:

		ret = ds2781_get_status(dev_info, &val->intval);

		break;



	case POWER_SUPPLY_PROP_CAPACITY:

		ret = ds2781_get_capacity(dev_info, &val->intval);

		break;



	case POWER_SUPPLY_PROP_CHARGE_COUNTER:

		ret = ds2781_get_accumulated_current(dev_info, &val->intval);

		break;



	case POWER_SUPPLY_PROP_CHARGE_NOW:

		ret = ds2781_get_charge_now(dev_info, &val->intval);

		break;



	default:

		ret = -EINVAL;

	}



	return ret;

}



static enum power_supply_property ds2781_battery_props[] = {

	POWER_SUPPLY_PROP_STATUS,

	POWER_SUPPLY_PROP_VOLTAGE_NOW,

	POWER_SUPPLY_PROP_TEMP,

	POWER_SUPPLY_PROP_MODEL_NAME,

	POWER_SUPPLY_PROP_MANUFACTURER,

	POWER_SUPPLY_PROP_CURRENT_NOW,

	POWER_SUPPLY_PROP_CURRENT_AVG,

	POWER_SUPPLY_PROP_CAPACITY,

	POWER_SUPPLY_PROP_CHARGE_COUNTER,

	POWER_SUPPLY_PROP_CHARGE_NOW,

};



static ssize_t ds2781_get_pmod_enabled(struct device *dev,

	struct device_attribute *attr,

	char *buf)

{

	int ret;

	u8 control_reg;

	struct power_supply *psy = to_power_supply(dev);

	struct ds2781_device_info *dev_info = to_ds2781_device_info(psy);



	/* Get power mode */

	ret = ds2781_get_control_register(dev_info, &control_reg);

	if (ret < 0)

		return ret;



	return sprintf(buf, "%d\n",

		 !!(control_reg & DS2781_CONTROL_PMOD));

}



static ssize_t ds2781_set_pmod_enabled(struct device *dev,

	struct device_attribute *attr,

	const char *buf,

	size_t count)

{

	int ret;

	u8 control_reg, new_setting;

	struct power_supply *psy = to_power_supply(dev);

	struct ds2781_device_info *dev_info = to_ds2781_device_info(psy);



	/* Set power mode */

	ret = ds2781_get_control_register(dev_info, &control_reg);

	if (ret < 0)

		return ret;



	ret = kstrtou8(buf, 0, &new_setting);

	if (ret < 0)

		return ret;



	if ((new_setting != 0) && (new_setting != 1)) {

		dev_err(dev_info->dev, "Invalid pmod setting (0 or 1)\n");

		return -EINVAL;

	}



	if (new_setting)

		control_reg |= DS2781_CONTROL_PMOD;

	else

		control_reg &= ~DS2781_CONTROL_PMOD;



	ret = ds2781_set_control_register(dev_info, control_reg);

	if (ret < 0)

		return ret;



	return count;

}



static ssize_t ds2781_get_sense_resistor_value(struct device *dev,

	struct device_attribute *attr,

	char *buf)

{

	int ret;

	u8 sense_resistor;

	struct power_supply *psy = to_power_supply(dev);

	struct ds2781_device_info *dev_info = to_ds2781_device_info(psy);



	ret = ds2781_read8(dev_info, &sense_resistor, DS2781_RSNSP);

	if (ret < 0)

		return ret;



	ret = sprintf(buf, "%d\n", sense_resistor);

	return ret;

}



static ssize_t ds2781_set_sense_resistor_value(struct device *dev,

	struct device_attribute *attr,

	const char *buf,

	size_t count)

{

	int ret;

	u8 new_setting;

	struct power_supply *psy = to_power_supply(dev);

	struct ds2781_device_info *dev_info = to_ds2781_device_info(psy);



	ret = kstrtou8(buf, 0, &new_setting);

	if (ret < 0)

		return ret;



	ret = ds2781_set_sense_register(dev_info, new_setting);

	if (ret < 0)

		return ret;



	return count;

}



static ssize_t ds2781_get_rsgain_setting(struct device *dev,

	struct device_attribute *attr,

	char *buf)

{

	int ret;

	u16 rsgain;

	struct power_supply *psy = to_power_supply(dev);

	struct ds2781_device_info *dev_info = to_ds2781_device_info(psy);



	ret = ds2781_get_rsgain_register(dev_info, &rsgain);

	if (ret < 0)

		return ret;



	return sprintf(buf, "%d\n", rsgain);

}



static ssize_t ds2781_set_rsgain_setting(struct device *dev,

	struct device_attribute *attr,

	const char *buf,

	size_t count)

{

	int ret;

	u16 new_setting;

	struct power_supply *psy = to_power_supply(dev);

	struct ds2781_device_info *dev_info = to_ds2781_device_info(psy);



	ret = kstrtou16(buf, 0, &new_setting);

	if (ret < 0)

		return ret;



	/* Gain can only be from 0 to 1.999 in steps of .001 */

	if (new_setting > 1999) {

		dev_err(dev_info->dev, "Invalid rsgain setting (0 - 1999)\n");

		return -EINVAL;

	}



	ret = ds2781_set_rsgain_register(dev_info, new_setting);

	if (ret < 0)

		return ret;



	return count;

}



static ssize_t ds2781_get_pio_pin(struct device *dev,

	struct device_attribute *attr,

	char *buf)

{

	int ret;

	u8 sfr;

	struct power_supply *psy = to_power_supply(dev);

	struct ds2781_device_info *dev_info = to_ds2781_device_info(psy);



	ret = ds2781_read8(dev_info, &sfr, DS2781_SFR);

	if (ret < 0)

		return ret;



	ret = sprintf(buf, "%d\n", sfr & DS2781_SFR_PIOSC);

	return ret;

}



static ssize_t ds2781_set_pio_pin(struct device *dev,

	struct device_attribute *attr,

	const char *buf,

	size_t count)

{

	int ret;

	u8 new_setting;

	struct power_supply *psy = to_power_supply(dev);

	struct ds2781_device_info *dev_info = to_ds2781_device_info(psy);



	ret = kstrtou8(buf, 0, &new_setting);

	if (ret < 0)

		return ret;



	if ((new_setting != 0) && (new_setting != 1)) {

		dev_err(dev_info->dev, "Invalid pio_pin setting (0 or 1)\n");

		return -EINVAL;

	}



	ret = ds2781_write(dev_info, &new_setting,

				DS2781_SFR, sizeof(u8));

	if (ret < 0)

		return ret;



	return count;

}



static ssize_t ds2781_read_param_eeprom_bin(struct file *filp,

				struct kobject *kobj,

				struct bin_attribute *bin_attr,

				char *buf, loff_t off, size_t count)

{

	struct device *dev = container_of(kobj, struct device, kobj);

	struct power_supply *psy = to_power_supply(dev);

	struct ds2781_device_info *dev_info = to_ds2781_device_info(psy);



	count = min_t(loff_t, count,

		DS2781_EEPROM_BLOCK1_END -

		DS2781_EEPROM_BLOCK1_START + 1 - off);



	return ds2781_read_block(dev_info, buf,

				DS2781_EEPROM_BLOCK1_START + off, count);

}



static ssize_t ds2781_write_param_eeprom_bin(struct file *filp,

				struct kobject *kobj,

				struct bin_attribute *bin_attr,

				char *buf, loff_t off, size_t count)

{

	struct device *dev = container_of(kobj, struct device, kobj);

	struct power_supply *psy = to_power_supply(dev);

	struct ds2781_device_info *dev_info = to_ds2781_device_info(psy);

	int ret;



	count = min_t(loff_t, count,

		DS2781_EEPROM_BLOCK1_END -

		DS2781_EEPROM_BLOCK1_START + 1 - off);



	ret = ds2781_write(dev_info, buf,

				DS2781_EEPROM_BLOCK1_START + off, count);

	if (ret < 0)

		return ret;



	ret = ds2781_save_eeprom(dev_info, DS2781_EEPROM_BLOCK1_START);

	if (ret < 0)

		return ret;



	return count;

}



static struct bin_attribute ds2781_param_eeprom_bin_attr = {

	.attr = {

		.name = "param_eeprom",

		.mode = S_IRUGO | S_IWUSR,

	},

	.size = DS2781_EEPROM_BLOCK1_END - DS2781_EEPROM_BLOCK1_START + 1,

	.read = ds2781_read_param_eeprom_bin,

	.write = ds2781_write_param_eeprom_bin,

};



static ssize_t ds2781_read_user_eeprom_bin(struct file *filp,

				struct kobject *kobj,

				struct bin_attribute *bin_attr,

				char *buf, loff_t off, size_t count)

{

	struct device *dev = container_of(kobj, struct device, kobj);

	struct power_supply *psy = to_power_supply(dev);

	struct ds2781_device_info *dev_info = to_ds2781_device_info(psy);



	count = min_t(loff_t, count,

		DS2781_EEPROM_BLOCK0_END -

		DS2781_EEPROM_BLOCK0_START + 1 - off);



	return ds2781_read_block(dev_info, buf,

				DS2781_EEPROM_BLOCK0_START + off, count);



}



static ssize_t ds2781_write_user_eeprom_bin(struct file *filp,

				struct kobject *kobj,

				struct bin_attribute *bin_attr,

				char *buf, loff_t off, size_t count)

{

	struct device *dev = container_of(kobj, struct device, kobj);

	struct power_supply *psy = to_power_supply(dev);

	struct ds2781_device_info *dev_info = to_ds2781_device_info(psy);

	int ret;



	count = min_t(loff_t, count,

		DS2781_EEPROM_BLOCK0_END -

		DS2781_EEPROM_BLOCK0_START + 1 - off);



	ret = ds2781_write(dev_info, buf,

				DS2781_EEPROM_BLOCK0_START + off, count);

	if (ret < 0)

		return ret;



	ret = ds2781_save_eeprom(dev_info, DS2781_EEPROM_BLOCK0_START);

	if (ret < 0)

		return ret;



	return count;

}



static struct bin_attribute ds2781_user_eeprom_bin_attr = {

	.attr = {

		.name = "user_eeprom",

		.mode = S_IRUGO | S_IWUSR,

	},

	.size = DS2781_EEPROM_BLOCK0_END - DS2781_EEPROM_BLOCK0_START + 1,

	.read = ds2781_read_user_eeprom_bin,

	.write = ds2781_write_user_eeprom_bin,

};



static DEVICE_ATTR(pmod_enabled, S_IRUGO | S_IWUSR, ds2781_get_pmod_enabled,

	ds2781_set_pmod_enabled);

static DEVICE_ATTR(sense_resistor_value, S_IRUGO | S_IWUSR,

	ds2781_get_sense_resistor_value, ds2781_set_sense_resistor_value);

static DEVICE_ATTR(rsgain_setting, S_IRUGO | S_IWUSR, ds2781_get_rsgain_setting,

	ds2781_set_rsgain_setting);

static DEVICE_ATTR(pio_pin, S_IRUGO | S_IWUSR, ds2781_get_pio_pin,

	ds2781_set_pio_pin);





static struct attribute *ds2781_attributes[] = {

	&dev_attr_pmod_enabled.attr,

	&dev_attr_sense_resistor_value.attr,

	&dev_attr_rsgain_setting.attr,

	&dev_attr_pio_pin.attr,

	NULL

};



static const struct attribute_group ds2781_attr_group = {

	.attrs = ds2781_attributes,

};



static int __devinit ds2781_battery_probe(struct platform_device *pdev)

{

	int ret = 0;

	struct ds2781_device_info *dev_info;



	dev_info = kzalloc(sizeof(*dev_info), GFP_KERNEL);

	if (!dev_info) {

		ret = -ENOMEM;

		goto fail;

	}



	platform_set_drvdata(pdev, dev_info);



	dev_info->dev			= &pdev->dev;

	dev_info->w1_dev		= pdev->dev.parent;

	dev_info->bat.name		= dev_name(&pdev->dev);

	dev_info->bat.type		= POWER_SUPPLY_TYPE_BATTERY;

	dev_info->bat.properties	= ds2781_battery_props;

	dev_info->bat.num_properties	= ARRAY_SIZE(ds2781_battery_props);

	dev_info->bat.get_property	= ds2781_battery_get_property;

	dev_info->mutex_holder		= current;



	ret = power_supply_register(&pdev->dev, &dev_info->bat);

	if (ret) {

		dev_err(dev_info->dev, "failed to register battery\n");

		goto fail_free_info;

	}



	ret = sysfs_create_group(&dev_info->bat.dev->kobj, &ds2781_attr_group);

	if (ret) {

		dev_err(dev_info->dev, "failed to create sysfs group\n");

		goto fail_unregister;

	}



	ret = sysfs_create_bin_file(&dev_info->bat.dev->kobj,

					&ds2781_param_eeprom_bin_attr);

	if (ret) {

		dev_err(dev_info->dev,

				"failed to create param eeprom bin file");

		goto fail_remove_group;

	}



	ret = sysfs_create_bin_file(&dev_info->bat.dev->kobj,

					&ds2781_user_eeprom_bin_attr);

	if (ret) {

		dev_err(dev_info->dev,

				"failed to create user eeprom bin file");

		goto fail_remove_bin_file;

	}



	dev_info->mutex_holder = NULL;



	return 0;



fail_remove_bin_file:

	sysfs_remove_bin_file(&dev_info->bat.dev->kobj,

				&ds2781_param_eeprom_bin_attr);

fail_remove_group:

	sysfs_remove_group(&dev_info->bat.dev->kobj, &ds2781_attr_group);

fail_unregister:

	power_supply_unregister(&dev_info->bat);

fail_free_info:

	kfree(dev_info);

fail:

	return ret;

}



static int __devexit ds2781_battery_remove(struct platform_device *pdev)

{

	struct ds2781_device_info *dev_info = platform_get_drvdata(pdev);



	dev_info->mutex_holder = current;



	/* remove attributes */

	sysfs_remove_group(&dev_info->bat.dev->kobj, &ds2781_attr_group);



	power_supply_unregister(&dev_info->bat);



	kfree(dev_info);

	return 0;

}



static struct platform_driver ds2781_battery_driver = {

	.driver = {

		.name = "ds2781-battery",

	},

	.probe	  = ds2781_battery_probe,

	.remove   = __devexit_p(ds2781_battery_remove),

};



static int __init ds2781_battery_init(void)

{

	return platform_driver_register(&ds2781_battery_driver);

}



static void __exit ds2781_battery_exit(void)

{

	platform_driver_unregister(&ds2781_battery_driver);

}



module_init(ds2781_battery_init);

module_exit(ds2781_battery_exit);





MODULE_LICENSE("GPL");

MODULE_AUTHOR("Renata Sayakhova <renata@oktetlabs.ru>");

MODULE_DESCRIPTION("Maxim/Dallas DS2781 Stand-Alone Fuel Gauage IC driver");

MODULE_ALIAS("platform:ds2781-battery");

drivers/w1/slaves/Kconfig

+13 −0
Original line number Diff line number Diff line
@@ -81,6 +81,19 @@ config W1_SLAVE_DS2780 


	  If you are unsure, say N.



config W1_SLAVE_DS2781

	tristate "Dallas 2781 battery monitor chip"

	depends on W1

	help

	  If you enable this you will have the DS2781 battery monitor

	  chip support.



	  The battery monitor chip is used in many batteries/devices

	  as the one who is responsible for charging/discharging/monitoring

	  Li+ batteries.



	  If you are unsure, say N.



config W1_SLAVE_BQ27000

	tristate "BQ27000 slave support"

	depends on W1

drivers/w1/slaves/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -10,4 +10,5 @@ obj-$(CONFIG_W1_SLAVE_DS2431) += w1_ds2431.o 
obj-$(CONFIG_W1_SLAVE_DS2433)	+= w1_ds2433.o

obj-$(CONFIG_W1_SLAVE_DS2760)	+= w1_ds2760.o

obj-$(CONFIG_W1_SLAVE_DS2780)	+= w1_ds2780.o

obj-$(CONFIG_W1_SLAVE_DS2781)	+= w1_ds2781.o

obj-$(CONFIG_W1_SLAVE_BQ27000)	+= w1_bq27000.o