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Commit 9b9ade6b authored by Yulia Vilensky's avatar Yulia Vilensky Committed by Anton Vorontsov
Browse files

ds2782_battery: Add support for ds2786 battery gas gauge 



Signed-off-by: default avatarYulia Vilensky <vilensky@compulab.co.il>
Signed-off-by: default avatarMike Rapoport <mike@compulab.co.il>
Signed-off-by: default avatarAnton Vorontsov <cbouatmailru@gmail.com>
parent 8ef1bb53

drivers/power/Kconfig

+2 −2
Original line number Diff line number Diff line
@@ -65,10 +65,10 @@ config BATTERY_DS2760 
	  Say Y here to enable support for batteries with ds2760 chip.



config BATTERY_DS2782

	tristate "DS2782 standalone gas-gauge"

	tristate "DS2782/DS2786 standalone gas-gauge"

	depends on I2C

	help

	  Say Y here to enable support for the DS2782 standalone battery

	  Say Y here to enable support for the DS2782/DS2786 standalone battery

	  gas-gauge.



config BATTERY_PMU

drivers/power/ds2782_battery.c

+136 −48
Original line number Diff line number Diff line
@@ -5,6 +5,8 @@ 
 *

 * Author: Ryan Mallon <ryan@bluewatersys.com>

 *

 * DS2786 added by Yulia Vilensky <vilensky@compulab.co.il>

 *

 * 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.
@@ -20,12 +22,13 @@ 
#include <linux/idr.h>

#include <linux/power_supply.h>

#include <linux/slab.h>

#include <linux/ds2782_battery.h>



#define DS2782_REG_RARC		0x06	/* Remaining active relative capacity */



#define DS2782_REG_VOLT_MSB	0x0c

#define DS2782_REG_TEMP_MSB	0x0a

#define DS2782_REG_CURRENT_MSB	0x0e

#define DS278x_REG_VOLT_MSB	0x0c

#define DS278x_REG_TEMP_MSB	0x0a

#define DS278x_REG_CURRENT_MSB	0x0e



/* EEPROM Block */

#define DS2782_REG_RSNSP	0x69	/* Sense resistor value */
@@ -33,18 +36,33 @@ 
/* Current unit measurement in uA for a 1 milli-ohm sense resistor */

#define DS2782_CURRENT_UNITS	1563



#define to_ds2782_info(x) container_of(x, struct ds2782_info, battery)

#define DS2786_REG_RARC		0x02	/* Remaining active relative capacity */



#define DS2786_CURRENT_UNITS	25



struct ds278x_info;



struct ds278x_battery_ops {

	int	(*get_current)(struct ds278x_info *info, int *current_uA);

	int	(*get_voltage)(struct ds278x_info *info, int *voltage_uA);

	int	(*get_capacity)(struct ds278x_info *info, int *capacity_uA);



};



#define to_ds278x_info(x) container_of(x, struct ds278x_info, battery)



struct ds2782_info {

struct ds278x_info {

	struct i2c_client	*client;

	struct power_supply	battery;

	struct ds278x_battery_ops  *ops;

	int			id;

	int                     rsns;

};



static DEFINE_IDR(battery_id);

static DEFINE_MUTEX(battery_lock);



static inline int ds2782_read_reg(struct ds2782_info *info, int reg, u8 *val)

static inline int ds278x_read_reg(struct ds278x_info *info, int reg, u8 *val)

{

	int ret;
@@ -58,7 +76,7 @@ static inline int ds2782_read_reg(struct ds2782_info *info, int reg, u8 *val) 
	return 0;

}



static inline int ds2782_read_reg16(struct ds2782_info *info, int reg_msb,

static inline int ds278x_read_reg16(struct ds278x_info *info, int reg_msb,

				    s16 *val)

{

	int ret;
@@ -73,7 +91,7 @@ static inline int ds2782_read_reg16(struct ds2782_info *info, int reg_msb, 
	return 0;

}



static int ds2782_get_temp(struct ds2782_info *info, int *temp)

static int ds278x_get_temp(struct ds278x_info *info, int *temp)

{

	s16 raw;

	int err;
@@ -84,14 +102,14 @@ static int ds2782_get_temp(struct ds2782_info *info, int *temp) 
	 * celsius. The temperature value is stored as a 10 bit number, plus

	 * sign in the upper bits of a 16 bit register.

	 */

	err = ds2782_read_reg16(info, DS2782_REG_TEMP_MSB, &raw);

	err = ds278x_read_reg16(info, DS278x_REG_TEMP_MSB, &raw);

	if (err)

		return err;

	*temp = ((raw / 32) * 125) / 100;

	return 0;

}



static int ds2782_get_current(struct ds2782_info *info, int *current_uA)

static int ds2782_get_current(struct ds278x_info *info, int *current_uA)

{

	int sense_res;

	int err;
@@ -102,7 +120,7 @@ static int ds2782_get_current(struct ds2782_info *info, int *current_uA) 
	 * The units of measurement for current are dependent on the value of

	 * the sense resistor.

	 */

	err = ds2782_read_reg(info, DS2782_REG_RSNSP, &sense_res_raw);

	err = ds278x_read_reg(info, DS2782_REG_RSNSP, &sense_res_raw);

	if (err)

		return err;

	if (sense_res_raw == 0) {
@@ -113,14 +131,14 @@ static int ds2782_get_current(struct ds2782_info *info, int *current_uA) 


	dev_dbg(&info->client->dev, "sense resistor = %d milli-ohms\n",

		sense_res);

	err = ds2782_read_reg16(info, DS2782_REG_CURRENT_MSB, &raw);

	err = ds278x_read_reg16(info, DS278x_REG_CURRENT_MSB, &raw);

	if (err)

		return err;

	*current_uA = raw * (DS2782_CURRENT_UNITS / sense_res);

	return 0;

}



static int ds2782_get_voltage(struct ds2782_info *info, int *voltage_uA)

static int ds2782_get_voltage(struct ds278x_info *info, int *voltage_uA)

{

	s16 raw;

	int err;
@@ -129,36 +147,77 @@ static int ds2782_get_voltage(struct ds2782_info *info, int *voltage_uA) 
	 * Voltage is measured in units of 4.88mV. The voltage is stored as

	 * a 10-bit number plus sign, in the upper bits of a 16-bit register

	 */

	err = ds2782_read_reg16(info, DS2782_REG_VOLT_MSB, &raw);

	err = ds278x_read_reg16(info, DS278x_REG_VOLT_MSB, &raw);

	if (err)

		return err;

	*voltage_uA = (raw / 32) * 4800;

	return 0;

}



static int ds2782_get_capacity(struct ds2782_info *info, int *capacity)

static int ds2782_get_capacity(struct ds278x_info *info, int *capacity)

{

	int err;

	u8 raw;



	err = ds2782_read_reg(info, DS2782_REG_RARC, &raw);

	err = ds278x_read_reg(info, DS2782_REG_RARC, &raw);

	if (err)

		return err;

	*capacity = raw;

	return raw;

}



static int ds2782_get_status(struct ds2782_info *info, int *status)

static int ds2786_get_current(struct ds278x_info *info, int *current_uA)

{

	int err;

	s16 raw;



	err = ds278x_read_reg16(info, DS278x_REG_CURRENT_MSB, &raw);

	if (err)

		return err;

	*current_uA = (raw / 16) * (DS2786_CURRENT_UNITS / info->rsns);

	return 0;

}



static int ds2786_get_voltage(struct ds278x_info *info, int *voltage_uA)

{

	s16 raw;

	int err;



	/*

	 * Voltage is measured in units of 1.22mV. The voltage is stored as

	 * a 10-bit number plus sign, in the upper bits of a 16-bit register

	 */

	err = ds278x_read_reg16(info, DS278x_REG_VOLT_MSB, &raw);

	if (err)

		return err;

	*voltage_uA = (raw / 8) * 1220;

	return 0;

}



static int ds2786_get_capacity(struct ds278x_info *info, int *capacity)

{

	int err;

	u8 raw;



	err = ds278x_read_reg(info, DS2786_REG_RARC, &raw);

	if (err)

		return err;

	/* Relative capacity is displayed with resolution 0.5 % */

	*capacity = raw/2 ;

	return 0;

}



static int ds278x_get_status(struct ds278x_info *info, int *status)

{

	int err;

	int current_uA;

	int capacity;



	err = ds2782_get_current(info, &current_uA);

	err = info->ops->get_current(info, &current_uA);

	if (err)

		return err;



	err = ds2782_get_capacity(info, &capacity);

	err = info->ops->get_capacity(info, &capacity);

	if (err)

		return err;
@@ -174,32 +233,32 @@ static int ds2782_get_status(struct ds2782_info *info, int *status) 
	return 0;

}



static int ds2782_battery_get_property(struct power_supply *psy,

static int ds278x_battery_get_property(struct power_supply *psy,

				       enum power_supply_property prop,

				       union power_supply_propval *val)

{

	struct ds2782_info *info = to_ds2782_info(psy);

	struct ds278x_info *info = to_ds278x_info(psy);

	int ret;



	switch (prop) {

	case POWER_SUPPLY_PROP_STATUS:

		ret = ds2782_get_status(info, &val->intval);

		ret = ds278x_get_status(info, &val->intval);

		break;



	case POWER_SUPPLY_PROP_CAPACITY:

		ret = ds2782_get_capacity(info, &val->intval);

		ret = info->ops->get_capacity(info, &val->intval);

		break;



	case POWER_SUPPLY_PROP_VOLTAGE_NOW:

		ret = ds2782_get_voltage(info, &val->intval);

		ret = info->ops->get_voltage(info, &val->intval);

		break;



	case POWER_SUPPLY_PROP_CURRENT_NOW:

		ret = ds2782_get_current(info, &val->intval);

		ret = info->ops->get_current(info, &val->intval);

		break;



	case POWER_SUPPLY_PROP_TEMP:

		ret = ds2782_get_temp(info, &val->intval);

		ret = ds278x_get_temp(info, &val->intval);

		break;



	default:
@@ -209,7 +268,7 @@ static int ds2782_battery_get_property(struct power_supply *psy, 
	return ret;

}



static enum power_supply_property ds2782_battery_props[] = {

static enum power_supply_property ds278x_battery_props[] = {

	POWER_SUPPLY_PROP_STATUS,

	POWER_SUPPLY_PROP_CAPACITY,

	POWER_SUPPLY_PROP_VOLTAGE_NOW,
@@ -217,18 +276,18 @@ static enum power_supply_property ds2782_battery_props[] = { 
	POWER_SUPPLY_PROP_TEMP,

};



static void ds2782_power_supply_init(struct power_supply *battery)

static void ds278x_power_supply_init(struct power_supply *battery)

{

	battery->type			= POWER_SUPPLY_TYPE_BATTERY;

	battery->properties		= ds2782_battery_props;

	battery->num_properties		= ARRAY_SIZE(ds2782_battery_props);

	battery->get_property		= ds2782_battery_get_property;

	battery->properties		= ds278x_battery_props;

	battery->num_properties		= ARRAY_SIZE(ds278x_battery_props);

	battery->get_property		= ds278x_battery_get_property;

	battery->external_power_changed	= NULL;

}



static int ds2782_battery_remove(struct i2c_client *client)

static int ds278x_battery_remove(struct i2c_client *client)

{

	struct ds2782_info *info = i2c_get_clientdata(client);

	struct ds278x_info *info = i2c_get_clientdata(client);



	power_supply_unregister(&info->battery);

	kfree(info->battery.name);
@@ -241,13 +300,36 @@ static int ds2782_battery_remove(struct i2c_client *client) 
	return 0;

}



static int ds2782_battery_probe(struct i2c_client *client,

static struct ds278x_battery_ops ds278x_ops[] = {

	[0] = {

		.get_current  = ds2782_get_current,

		.get_voltage  = ds2782_get_voltage,

		.get_capacity = ds2782_get_capacity,

	},

	[1] = {

		.get_current  = ds2786_get_current,

		.get_voltage  = ds2786_get_voltage,

		.get_capacity = ds2786_get_capacity,

	}

};



static int ds278x_battery_probe(struct i2c_client *client,

				const struct i2c_device_id *id)

{

	struct ds2782_info *info;

	struct ds278x_platform_data *pdata = client->dev.platform_data;

	struct ds278x_info *info;

	int ret;

	int num;



	/*

	 * ds2786 should have the sense resistor value set

	 * in the platform data

	 */

	if (id->driver_data == 1 && !pdata) {

		dev_err(&client->dev, "missing platform data for ds2786\n");

		return -EINVAL;

	}



	/* Get an ID for this battery */

	ret = idr_pre_get(&battery_id, GFP_KERNEL);

	if (ret == 0) {
@@ -267,15 +349,20 @@ static int ds2782_battery_probe(struct i2c_client *client, 
		goto fail_info;

	}



	info->battery.name = kasprintf(GFP_KERNEL, "ds2782-%d", num);

	info->battery.name = kasprintf(GFP_KERNEL, "%s-%d", client->name, num);

	if (!info->battery.name) {

		ret = -ENOMEM;

		goto fail_name;

	}



	if (id->driver_data == 1)

		info->rsns = pdata->rsns;



	i2c_set_clientdata(client, info);

	info->client = client;

	ds2782_power_supply_init(&info->battery);

	info->id = num;

	info->ops  = &ds278x_ops[id->driver_data];

	ds278x_power_supply_init(&info->battery);



	ret = power_supply_register(&client->dev, &info->battery);

	if (ret) {
@@ -297,31 +384,32 @@ static int ds2782_battery_probe(struct i2c_client *client, 
	return ret;

}



static const struct i2c_device_id ds2782_id[] = {

static const struct i2c_device_id ds278x_id[] = {

	{"ds2782", 0},

	{"ds2786", 1},

	{},

};



static struct i2c_driver ds2782_battery_driver = {

static struct i2c_driver ds278x_battery_driver = {

	.driver 	= {

		.name	= "ds2782-battery",

	},

	.probe		= ds2782_battery_probe,

	.remove		= ds2782_battery_remove,

	.id_table	= ds2782_id,

	.probe		= ds278x_battery_probe,

	.remove		= ds278x_battery_remove,

	.id_table	= ds278x_id,

};



static int __init ds2782_init(void)

static int __init ds278x_init(void)

{

	return i2c_add_driver(&ds2782_battery_driver);

	return i2c_add_driver(&ds278x_battery_driver);

}

module_init(ds2782_init);

module_init(ds278x_init);



static void __exit ds2782_exit(void)

static void __exit ds278x_exit(void)

{

	i2c_del_driver(&ds2782_battery_driver);

	i2c_del_driver(&ds278x_battery_driver);

}

module_exit(ds2782_exit);

module_exit(ds278x_exit);



MODULE_AUTHOR("Ryan Mallon <ryan@bluewatersys.com>");

MODULE_DESCRIPTION("Maxim/Dallas DS2782 Stand-Alone Fuel Gauage IC driver");

include/linux/ds2782_battery.h

0 → 100644
+8 −0
Original line number Diff line number Diff line 
#ifndef __LINUX_DS2782_BATTERY_H

#define __LINUX_DS2782_BATTERY_H



struct ds278x_platform_data {

	int rsns;

};



#endif