drivers/power/twl4030_madc_battery.c - kernel/msm-4.9 - Gitiles

 /*
  * 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");
	/*
	* 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");