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Commit da0a00eb authored by Marek Belisko's avatar Marek Belisko Committed by Anton Vorontsov
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power: Add twl4030_madc battery driver. 



This driver is used and tested on gta04 phone. It's using twl4030_madc
(similar to rx51 existing driver). Driver also implement charging and
discharging calibration data so user can define ranges and level.

Signed-off-by: default avatarMarek Belisko <marek@goldelico.com>
Signed-off-by: default avatarLukas Märdian <lukas@goldelico.com>
Signed-off-by: default avatarAnton Vorontsov <anton@enomsg.org>
parent d24fed39

drivers/power/Kconfig

+7 −0
Original line number Diff line number Diff line
@@ -216,6 +216,13 @@ config BATTERY_S3C_ADC 
	help

	  Say Y here to enable support for iPAQ h1930/h1940/rx1950 battery



config BATTERY_TWL4030_MADC

	tristate "TWL4030 MADC battery driver"

	depends on TWL4030_MADC

	help

	  Say Y here to enable this dumb driver for batteries managed

	  through the TWL4030 MADC.



config CHARGER_88PM860X

	tristate "Marvell 88PM860x Charger driver"

	depends on MFD_88PM860X && BATTERY_88PM860X

drivers/power/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -34,6 +34,7 @@ obj-$(CONFIG_BATTERY_MAX17040) += max17040_battery.o 
obj-$(CONFIG_BATTERY_MAX17042)	+= max17042_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

obj-$(CONFIG_CHARGER_88PM860X)	+= 88pm860x_charger.o

obj-$(CONFIG_CHARGER_PCF50633)	+= pcf50633-charger.o

obj-$(CONFIG_BATTERY_JZ4740)	+= jz4740-battery.o

drivers/power/twl4030_madc_battery.c

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/*

 * Dumb driver for LiIon batteries using TWL4030 madc.

 *

 * Copyright 2013 Golden Delicious Computers

 * Lukas Märdian <lukas@goldelico.com>

 *

 * Based on dumb driver for gta01 battery

 * Copyright 2009 Openmoko, Inc

 * Balaji Rao <balajirrao@openmoko.org>

 */



#include <linux/module.h>

#include <linux/param.h>

#include <linux/delay.h>

#include <linux/workqueue.h>

#include <linux/platform_device.h>

#include <linux/power_supply.h>

#include <linux/slab.h>

#include <linux/sort.h>

#include <linux/i2c/twl4030-madc.h>

#include <linux/power/twl4030_madc_battery.h>



struct twl4030_madc_battery {

	struct power_supply psy;

	struct twl4030_madc_bat_platform_data *pdata;

};



static enum power_supply_property twl4030_madc_bat_props[] = {

	POWER_SUPPLY_PROP_PRESENT,

	POWER_SUPPLY_PROP_STATUS,

	POWER_SUPPLY_PROP_TECHNOLOGY,

	POWER_SUPPLY_PROP_VOLTAGE_NOW,

	POWER_SUPPLY_PROP_CURRENT_NOW,

	POWER_SUPPLY_PROP_CAPACITY,

	POWER_SUPPLY_PROP_CHARGE_FULL,

	POWER_SUPPLY_PROP_CHARGE_NOW,

	POWER_SUPPLY_PROP_TEMP,

	POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,

};



static int madc_read(int index)

{

	struct twl4030_madc_request req;

	int val;



	req.channels = index;

	req.method = TWL4030_MADC_SW2;

	req.type = TWL4030_MADC_WAIT;

	req.do_avg = 0;

	req.raw = false;

	req.func_cb = NULL;



	val = twl4030_madc_conversion(&req);

	if (val < 0)

		return val;



	return req.rbuf[ffs(index) - 1];

}



static int twl4030_madc_bat_get_charging_status(void)

{

	return (madc_read(TWL4030_MADC_ICHG) > 0) ? 1 : 0;

}



static int twl4030_madc_bat_get_voltage(void)

{

	return madc_read(TWL4030_MADC_VBAT);

}



static int twl4030_madc_bat_get_current(void)

{

	return madc_read(TWL4030_MADC_ICHG) * 1000;

}



static int twl4030_madc_bat_get_temp(void)

{

	return madc_read(TWL4030_MADC_BTEMP) * 10;

}



static int twl4030_madc_bat_voltscale(struct twl4030_madc_battery *bat,

					int volt)

{

	struct twl4030_madc_bat_calibration *calibration;

	int i, res = 0;



	/* choose charging curve */

	if (twl4030_madc_bat_get_charging_status())

		calibration = bat->pdata->charging;

	else

		calibration = bat->pdata->discharging;



	if (volt > calibration[0].voltage) {

		res = calibration[0].level;

	} else {

		for (i = 0; calibration[i+1].voltage >= 0; i++) {

			if (volt <= calibration[i].voltage &&

					volt >= calibration[i+1].voltage) {

				/* interval found - interpolate within range */

				res = calibration[i].level -

					((calibration[i].voltage - volt) *

					(calibration[i].level -

					calibration[i+1].level)) /

					(calibration[i].voltage -

					calibration[i+1].voltage);

				break;

			}

		}

	}

	return res;

}



static int twl4030_madc_bat_get_property(struct power_supply *psy,

					enum power_supply_property psp,

					union power_supply_propval *val)

{

	struct twl4030_madc_battery *bat = container_of(psy,

					struct twl4030_madc_battery, psy);



	switch (psp) {

	case POWER_SUPPLY_PROP_STATUS:

		if (twl4030_madc_bat_voltscale(bat,

				twl4030_madc_bat_get_voltage()) > 95)

			val->intval = POWER_SUPPLY_STATUS_FULL;

		else {

			if (twl4030_madc_bat_get_charging_status())

				val->intval = POWER_SUPPLY_STATUS_CHARGING;

			else

				val->intval = POWER_SUPPLY_STATUS_DISCHARGING;

		}

		break;

	case POWER_SUPPLY_PROP_VOLTAGE_NOW:

		val->intval = twl4030_madc_bat_get_voltage() * 1000;

		break;

	case POWER_SUPPLY_PROP_TECHNOLOGY:

		val->intval = POWER_SUPPLY_TECHNOLOGY_LION;

		break;

	case POWER_SUPPLY_PROP_CURRENT_NOW:

		val->intval = twl4030_madc_bat_get_current();

		break;

	case POWER_SUPPLY_PROP_PRESENT:

		/* assume battery is always present */

		val->intval = 1;

		break;

	case POWER_SUPPLY_PROP_CHARGE_NOW: {

			int percent = twl4030_madc_bat_voltscale(bat,

					twl4030_madc_bat_get_voltage());

			val->intval = (percent * bat->pdata->capacity) / 100;

			break;

		}

	case POWER_SUPPLY_PROP_CAPACITY:

		val->intval = twl4030_madc_bat_voltscale(bat,

					twl4030_madc_bat_get_voltage());

		break;

	case POWER_SUPPLY_PROP_CHARGE_FULL:

		val->intval = bat->pdata->capacity;

		break;

	case POWER_SUPPLY_PROP_TEMP:

		val->intval = twl4030_madc_bat_get_temp();

		break;

	case POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW: {

			int percent = twl4030_madc_bat_voltscale(bat,

					twl4030_madc_bat_get_voltage());

			/* in mAh */

			int chg = (percent * (bat->pdata->capacity/1000))/100;



			/* assume discharge with 400 mA (ca. 1.5W) */

			val->intval = (3600l * chg) / 400;

			break;

		}

	default:

		return -EINVAL;

	}



	return 0;

}



static void twl4030_madc_bat_ext_changed(struct power_supply *psy)

{

	struct twl4030_madc_battery *bat = container_of(psy,

					struct twl4030_madc_battery, psy);



	power_supply_changed(&bat->psy);

}



static int twl4030_cmp(const void *a, const void *b)

{

	return ((struct twl4030_madc_bat_calibration *)b)->voltage -

		((struct twl4030_madc_bat_calibration *)a)->voltage;

}



static int twl4030_madc_battery_probe(struct platform_device *pdev)

{

	struct twl4030_madc_battery *twl4030_madc_bat;

	struct twl4030_madc_bat_platform_data *pdata = pdev->dev.platform_data;



	twl4030_madc_bat = kzalloc(sizeof(*twl4030_madc_bat), GFP_KERNEL);

	if (!twl4030_madc_bat)

		return -ENOMEM;



	twl4030_madc_bat->psy.name = "twl4030_battery";

	twl4030_madc_bat->psy.type = POWER_SUPPLY_TYPE_BATTERY;

	twl4030_madc_bat->psy.properties = twl4030_madc_bat_props;

	twl4030_madc_bat->psy.num_properties =

					ARRAY_SIZE(twl4030_madc_bat_props);

	twl4030_madc_bat->psy.get_property = twl4030_madc_bat_get_property;

	twl4030_madc_bat->psy.external_power_changed =

					twl4030_madc_bat_ext_changed;



	/* sort charging and discharging calibration data */

	sort(pdata->charging, pdata->charging_size,

		sizeof(struct twl4030_madc_bat_calibration),

		twl4030_cmp, NULL);

	sort(pdata->discharging, pdata->discharging_size,

		sizeof(struct twl4030_madc_bat_calibration),

		twl4030_cmp, NULL);



	twl4030_madc_bat->pdata = pdata;

	platform_set_drvdata(pdev, twl4030_madc_bat);

	power_supply_register(&pdev->dev, &twl4030_madc_bat->psy);



	return 0;

}



static int twl4030_madc_battery_remove(struct platform_device *pdev)

{

	struct twl4030_madc_battery *bat = platform_get_drvdata(pdev);



	power_supply_unregister(&bat->psy);

	kfree(bat);



	return 0;

}



static struct platform_driver twl4030_madc_battery_driver = {

	.driver = {

		.name = "twl4030_madc_battery",

	},

	.probe  = twl4030_madc_battery_probe,

	.remove = twl4030_madc_battery_remove,

};

module_platform_driver(twl4030_madc_battery_driver);



MODULE_LICENSE("GPL");

MODULE_AUTHOR("Lukas Märdian <lukas@goldelico.com>");

MODULE_DESCRIPTION("twl4030_madc battery driver");

include/linux/power/twl4030_madc_battery.h

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/*

 * Dumb driver for LiIon batteries using TWL4030 madc.

 *

 * Copyright 2013 Golden Delicious Computers

 * Nikolaus Schaller <hns@goldelico.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.

 *

 *  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.,

 *  675 Mass Ave, Cambridge, MA 02139, USA.

 *

 */



#ifndef __TWL4030_MADC_BATTERY_H

#define __TWL4030_MADC_BATTERY_H



/*

 * Usually we can assume 100% @ 4.15V and 0% @ 3.3V but curves differ for

 * charging and discharging!

 */



struct twl4030_madc_bat_calibration {

	short voltage;	/* in mV - specify -1 for end of list */

	short level;	/* in percent (0 .. 100%) */

};



struct twl4030_madc_bat_platform_data {

	unsigned int capacity;	/* total capacity in uAh */

	struct twl4030_madc_bat_calibration *charging;

	int charging_size;

	struct twl4030_madc_bat_calibration *discharging;

	int discharging_size;

};



#endif