18c2ecf20Sopenharmony_ci// SPDX-License-Identifier: GPL-2.0-only
28c2ecf20Sopenharmony_ci/*
38c2ecf20Sopenharmony_ci * Dumb driver for LiIon batteries using TWL4030 madc.
48c2ecf20Sopenharmony_ci *
58c2ecf20Sopenharmony_ci * Copyright 2013 Golden Delicious Computers
68c2ecf20Sopenharmony_ci * Lukas Märdian <lukas@goldelico.com>
78c2ecf20Sopenharmony_ci *
88c2ecf20Sopenharmony_ci * Based on dumb driver for gta01 battery
98c2ecf20Sopenharmony_ci * Copyright 2009 Openmoko, Inc
108c2ecf20Sopenharmony_ci * Balaji Rao <balajirrao@openmoko.org>
118c2ecf20Sopenharmony_ci */
128c2ecf20Sopenharmony_ci
138c2ecf20Sopenharmony_ci#include <linux/module.h>
148c2ecf20Sopenharmony_ci#include <linux/param.h>
158c2ecf20Sopenharmony_ci#include <linux/delay.h>
168c2ecf20Sopenharmony_ci#include <linux/workqueue.h>
178c2ecf20Sopenharmony_ci#include <linux/platform_device.h>
188c2ecf20Sopenharmony_ci#include <linux/power_supply.h>
198c2ecf20Sopenharmony_ci#include <linux/slab.h>
208c2ecf20Sopenharmony_ci#include <linux/sort.h>
218c2ecf20Sopenharmony_ci#include <linux/power/twl4030_madc_battery.h>
228c2ecf20Sopenharmony_ci#include <linux/iio/consumer.h>
238c2ecf20Sopenharmony_ci
248c2ecf20Sopenharmony_cistruct twl4030_madc_battery {
258c2ecf20Sopenharmony_ci	struct power_supply *psy;
268c2ecf20Sopenharmony_ci	struct twl4030_madc_bat_platform_data *pdata;
278c2ecf20Sopenharmony_ci	struct iio_channel *channel_temp;
288c2ecf20Sopenharmony_ci	struct iio_channel *channel_ichg;
298c2ecf20Sopenharmony_ci	struct iio_channel *channel_vbat;
308c2ecf20Sopenharmony_ci};
318c2ecf20Sopenharmony_ci
328c2ecf20Sopenharmony_cistatic enum power_supply_property twl4030_madc_bat_props[] = {
338c2ecf20Sopenharmony_ci	POWER_SUPPLY_PROP_PRESENT,
348c2ecf20Sopenharmony_ci	POWER_SUPPLY_PROP_STATUS,
358c2ecf20Sopenharmony_ci	POWER_SUPPLY_PROP_TECHNOLOGY,
368c2ecf20Sopenharmony_ci	POWER_SUPPLY_PROP_VOLTAGE_NOW,
378c2ecf20Sopenharmony_ci	POWER_SUPPLY_PROP_CURRENT_NOW,
388c2ecf20Sopenharmony_ci	POWER_SUPPLY_PROP_CAPACITY,
398c2ecf20Sopenharmony_ci	POWER_SUPPLY_PROP_CHARGE_FULL,
408c2ecf20Sopenharmony_ci	POWER_SUPPLY_PROP_CHARGE_NOW,
418c2ecf20Sopenharmony_ci	POWER_SUPPLY_PROP_TEMP,
428c2ecf20Sopenharmony_ci	POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
438c2ecf20Sopenharmony_ci};
448c2ecf20Sopenharmony_ci
458c2ecf20Sopenharmony_cistatic int madc_read(struct iio_channel *channel)
468c2ecf20Sopenharmony_ci{
478c2ecf20Sopenharmony_ci	int val, err;
488c2ecf20Sopenharmony_ci	err = iio_read_channel_processed(channel, &val);
498c2ecf20Sopenharmony_ci	if (err < 0)
508c2ecf20Sopenharmony_ci		return err;
518c2ecf20Sopenharmony_ci
528c2ecf20Sopenharmony_ci	return val;
538c2ecf20Sopenharmony_ci}
548c2ecf20Sopenharmony_ci
558c2ecf20Sopenharmony_cistatic int twl4030_madc_bat_get_charging_status(struct twl4030_madc_battery *bt)
568c2ecf20Sopenharmony_ci{
578c2ecf20Sopenharmony_ci	return (madc_read(bt->channel_ichg) > 0) ? 1 : 0;
588c2ecf20Sopenharmony_ci}
598c2ecf20Sopenharmony_ci
608c2ecf20Sopenharmony_cistatic int twl4030_madc_bat_get_voltage(struct twl4030_madc_battery *bt)
618c2ecf20Sopenharmony_ci{
628c2ecf20Sopenharmony_ci	return madc_read(bt->channel_vbat);
638c2ecf20Sopenharmony_ci}
648c2ecf20Sopenharmony_ci
658c2ecf20Sopenharmony_cistatic int twl4030_madc_bat_get_current(struct twl4030_madc_battery *bt)
668c2ecf20Sopenharmony_ci{
678c2ecf20Sopenharmony_ci	return madc_read(bt->channel_ichg) * 1000;
688c2ecf20Sopenharmony_ci}
698c2ecf20Sopenharmony_ci
708c2ecf20Sopenharmony_cistatic int twl4030_madc_bat_get_temp(struct twl4030_madc_battery *bt)
718c2ecf20Sopenharmony_ci{
728c2ecf20Sopenharmony_ci	return madc_read(bt->channel_temp) * 10;
738c2ecf20Sopenharmony_ci}
748c2ecf20Sopenharmony_ci
758c2ecf20Sopenharmony_cistatic int twl4030_madc_bat_voltscale(struct twl4030_madc_battery *bat,
768c2ecf20Sopenharmony_ci					int volt)
778c2ecf20Sopenharmony_ci{
788c2ecf20Sopenharmony_ci	struct twl4030_madc_bat_calibration *calibration;
798c2ecf20Sopenharmony_ci	int i, res = 0;
808c2ecf20Sopenharmony_ci
818c2ecf20Sopenharmony_ci	/* choose charging curve */
828c2ecf20Sopenharmony_ci	if (twl4030_madc_bat_get_charging_status(bat))
838c2ecf20Sopenharmony_ci		calibration = bat->pdata->charging;
848c2ecf20Sopenharmony_ci	else
858c2ecf20Sopenharmony_ci		calibration = bat->pdata->discharging;
868c2ecf20Sopenharmony_ci
878c2ecf20Sopenharmony_ci	if (volt > calibration[0].voltage) {
888c2ecf20Sopenharmony_ci		res = calibration[0].level;
898c2ecf20Sopenharmony_ci	} else {
908c2ecf20Sopenharmony_ci		for (i = 0; calibration[i+1].voltage >= 0; i++) {
918c2ecf20Sopenharmony_ci			if (volt <= calibration[i].voltage &&
928c2ecf20Sopenharmony_ci					volt >= calibration[i+1].voltage) {
938c2ecf20Sopenharmony_ci				/* interval found - interpolate within range */
948c2ecf20Sopenharmony_ci				res = calibration[i].level -
958c2ecf20Sopenharmony_ci					((calibration[i].voltage - volt) *
968c2ecf20Sopenharmony_ci					(calibration[i].level -
978c2ecf20Sopenharmony_ci					calibration[i+1].level)) /
988c2ecf20Sopenharmony_ci					(calibration[i].voltage -
998c2ecf20Sopenharmony_ci					calibration[i+1].voltage);
1008c2ecf20Sopenharmony_ci				break;
1018c2ecf20Sopenharmony_ci			}
1028c2ecf20Sopenharmony_ci		}
1038c2ecf20Sopenharmony_ci	}
1048c2ecf20Sopenharmony_ci	return res;
1058c2ecf20Sopenharmony_ci}
1068c2ecf20Sopenharmony_ci
1078c2ecf20Sopenharmony_cistatic int twl4030_madc_bat_get_property(struct power_supply *psy,
1088c2ecf20Sopenharmony_ci					enum power_supply_property psp,
1098c2ecf20Sopenharmony_ci					union power_supply_propval *val)
1108c2ecf20Sopenharmony_ci{
1118c2ecf20Sopenharmony_ci	struct twl4030_madc_battery *bat = power_supply_get_drvdata(psy);
1128c2ecf20Sopenharmony_ci
1138c2ecf20Sopenharmony_ci	switch (psp) {
1148c2ecf20Sopenharmony_ci	case POWER_SUPPLY_PROP_STATUS:
1158c2ecf20Sopenharmony_ci		if (twl4030_madc_bat_voltscale(bat,
1168c2ecf20Sopenharmony_ci				twl4030_madc_bat_get_voltage(bat)) > 95)
1178c2ecf20Sopenharmony_ci			val->intval = POWER_SUPPLY_STATUS_FULL;
1188c2ecf20Sopenharmony_ci		else {
1198c2ecf20Sopenharmony_ci			if (twl4030_madc_bat_get_charging_status(bat))
1208c2ecf20Sopenharmony_ci				val->intval = POWER_SUPPLY_STATUS_CHARGING;
1218c2ecf20Sopenharmony_ci			else
1228c2ecf20Sopenharmony_ci				val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
1238c2ecf20Sopenharmony_ci		}
1248c2ecf20Sopenharmony_ci		break;
1258c2ecf20Sopenharmony_ci	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
1268c2ecf20Sopenharmony_ci		val->intval = twl4030_madc_bat_get_voltage(bat) * 1000;
1278c2ecf20Sopenharmony_ci		break;
1288c2ecf20Sopenharmony_ci	case POWER_SUPPLY_PROP_TECHNOLOGY:
1298c2ecf20Sopenharmony_ci		val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
1308c2ecf20Sopenharmony_ci		break;
1318c2ecf20Sopenharmony_ci	case POWER_SUPPLY_PROP_CURRENT_NOW:
1328c2ecf20Sopenharmony_ci		val->intval = twl4030_madc_bat_get_current(bat);
1338c2ecf20Sopenharmony_ci		break;
1348c2ecf20Sopenharmony_ci	case POWER_SUPPLY_PROP_PRESENT:
1358c2ecf20Sopenharmony_ci		/* assume battery is always present */
1368c2ecf20Sopenharmony_ci		val->intval = 1;
1378c2ecf20Sopenharmony_ci		break;
1388c2ecf20Sopenharmony_ci	case POWER_SUPPLY_PROP_CHARGE_NOW: {
1398c2ecf20Sopenharmony_ci			int percent = twl4030_madc_bat_voltscale(bat,
1408c2ecf20Sopenharmony_ci					twl4030_madc_bat_get_voltage(bat));
1418c2ecf20Sopenharmony_ci			val->intval = (percent * bat->pdata->capacity) / 100;
1428c2ecf20Sopenharmony_ci			break;
1438c2ecf20Sopenharmony_ci		}
1448c2ecf20Sopenharmony_ci	case POWER_SUPPLY_PROP_CAPACITY:
1458c2ecf20Sopenharmony_ci		val->intval = twl4030_madc_bat_voltscale(bat,
1468c2ecf20Sopenharmony_ci					twl4030_madc_bat_get_voltage(bat));
1478c2ecf20Sopenharmony_ci		break;
1488c2ecf20Sopenharmony_ci	case POWER_SUPPLY_PROP_CHARGE_FULL:
1498c2ecf20Sopenharmony_ci		val->intval = bat->pdata->capacity;
1508c2ecf20Sopenharmony_ci		break;
1518c2ecf20Sopenharmony_ci	case POWER_SUPPLY_PROP_TEMP:
1528c2ecf20Sopenharmony_ci		val->intval = twl4030_madc_bat_get_temp(bat);
1538c2ecf20Sopenharmony_ci		break;
1548c2ecf20Sopenharmony_ci	case POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW: {
1558c2ecf20Sopenharmony_ci			int percent = twl4030_madc_bat_voltscale(bat,
1568c2ecf20Sopenharmony_ci					twl4030_madc_bat_get_voltage(bat));
1578c2ecf20Sopenharmony_ci			/* in mAh */
1588c2ecf20Sopenharmony_ci			int chg = (percent * (bat->pdata->capacity/1000))/100;
1598c2ecf20Sopenharmony_ci
1608c2ecf20Sopenharmony_ci			/* assume discharge with 400 mA (ca. 1.5W) */
1618c2ecf20Sopenharmony_ci			val->intval = (3600l * chg) / 400;
1628c2ecf20Sopenharmony_ci			break;
1638c2ecf20Sopenharmony_ci		}
1648c2ecf20Sopenharmony_ci	default:
1658c2ecf20Sopenharmony_ci		return -EINVAL;
1668c2ecf20Sopenharmony_ci	}
1678c2ecf20Sopenharmony_ci
1688c2ecf20Sopenharmony_ci	return 0;
1698c2ecf20Sopenharmony_ci}
1708c2ecf20Sopenharmony_ci
1718c2ecf20Sopenharmony_cistatic void twl4030_madc_bat_ext_changed(struct power_supply *psy)
1728c2ecf20Sopenharmony_ci{
1738c2ecf20Sopenharmony_ci	power_supply_changed(psy);
1748c2ecf20Sopenharmony_ci}
1758c2ecf20Sopenharmony_ci
1768c2ecf20Sopenharmony_cistatic const struct power_supply_desc twl4030_madc_bat_desc = {
1778c2ecf20Sopenharmony_ci	.name			= "twl4030_battery",
1788c2ecf20Sopenharmony_ci	.type			= POWER_SUPPLY_TYPE_BATTERY,
1798c2ecf20Sopenharmony_ci	.properties		= twl4030_madc_bat_props,
1808c2ecf20Sopenharmony_ci	.num_properties		= ARRAY_SIZE(twl4030_madc_bat_props),
1818c2ecf20Sopenharmony_ci	.get_property		= twl4030_madc_bat_get_property,
1828c2ecf20Sopenharmony_ci	.external_power_changed	= twl4030_madc_bat_ext_changed,
1838c2ecf20Sopenharmony_ci
1848c2ecf20Sopenharmony_ci};
1858c2ecf20Sopenharmony_ci
1868c2ecf20Sopenharmony_cistatic int twl4030_cmp(const void *a, const void *b)
1878c2ecf20Sopenharmony_ci{
1888c2ecf20Sopenharmony_ci	return ((struct twl4030_madc_bat_calibration *)b)->voltage -
1898c2ecf20Sopenharmony_ci		((struct twl4030_madc_bat_calibration *)a)->voltage;
1908c2ecf20Sopenharmony_ci}
1918c2ecf20Sopenharmony_ci
1928c2ecf20Sopenharmony_cistatic int twl4030_madc_battery_probe(struct platform_device *pdev)
1938c2ecf20Sopenharmony_ci{
1948c2ecf20Sopenharmony_ci	struct twl4030_madc_battery *twl4030_madc_bat;
1958c2ecf20Sopenharmony_ci	struct twl4030_madc_bat_platform_data *pdata = pdev->dev.platform_data;
1968c2ecf20Sopenharmony_ci	struct power_supply_config psy_cfg = {};
1978c2ecf20Sopenharmony_ci	int ret = 0;
1988c2ecf20Sopenharmony_ci
1998c2ecf20Sopenharmony_ci	twl4030_madc_bat = devm_kzalloc(&pdev->dev, sizeof(*twl4030_madc_bat),
2008c2ecf20Sopenharmony_ci				GFP_KERNEL);
2018c2ecf20Sopenharmony_ci	if (!twl4030_madc_bat)
2028c2ecf20Sopenharmony_ci		return -ENOMEM;
2038c2ecf20Sopenharmony_ci
2048c2ecf20Sopenharmony_ci	twl4030_madc_bat->channel_temp = iio_channel_get(&pdev->dev, "temp");
2058c2ecf20Sopenharmony_ci	if (IS_ERR(twl4030_madc_bat->channel_temp)) {
2068c2ecf20Sopenharmony_ci		ret = PTR_ERR(twl4030_madc_bat->channel_temp);
2078c2ecf20Sopenharmony_ci		goto err;
2088c2ecf20Sopenharmony_ci	}
2098c2ecf20Sopenharmony_ci
2108c2ecf20Sopenharmony_ci	twl4030_madc_bat->channel_ichg = iio_channel_get(&pdev->dev, "ichg");
2118c2ecf20Sopenharmony_ci	if (IS_ERR(twl4030_madc_bat->channel_ichg)) {
2128c2ecf20Sopenharmony_ci		ret = PTR_ERR(twl4030_madc_bat->channel_ichg);
2138c2ecf20Sopenharmony_ci		goto err_temp;
2148c2ecf20Sopenharmony_ci	}
2158c2ecf20Sopenharmony_ci
2168c2ecf20Sopenharmony_ci	twl4030_madc_bat->channel_vbat = iio_channel_get(&pdev->dev, "vbat");
2178c2ecf20Sopenharmony_ci	if (IS_ERR(twl4030_madc_bat->channel_vbat)) {
2188c2ecf20Sopenharmony_ci		ret = PTR_ERR(twl4030_madc_bat->channel_vbat);
2198c2ecf20Sopenharmony_ci		goto err_ichg;
2208c2ecf20Sopenharmony_ci	}
2218c2ecf20Sopenharmony_ci
2228c2ecf20Sopenharmony_ci	/* sort charging and discharging calibration data */
2238c2ecf20Sopenharmony_ci	sort(pdata->charging, pdata->charging_size,
2248c2ecf20Sopenharmony_ci		sizeof(struct twl4030_madc_bat_calibration),
2258c2ecf20Sopenharmony_ci		twl4030_cmp, NULL);
2268c2ecf20Sopenharmony_ci	sort(pdata->discharging, pdata->discharging_size,
2278c2ecf20Sopenharmony_ci		sizeof(struct twl4030_madc_bat_calibration),
2288c2ecf20Sopenharmony_ci		twl4030_cmp, NULL);
2298c2ecf20Sopenharmony_ci
2308c2ecf20Sopenharmony_ci	twl4030_madc_bat->pdata = pdata;
2318c2ecf20Sopenharmony_ci	platform_set_drvdata(pdev, twl4030_madc_bat);
2328c2ecf20Sopenharmony_ci	psy_cfg.drv_data = twl4030_madc_bat;
2338c2ecf20Sopenharmony_ci	twl4030_madc_bat->psy = power_supply_register(&pdev->dev,
2348c2ecf20Sopenharmony_ci						      &twl4030_madc_bat_desc,
2358c2ecf20Sopenharmony_ci						      &psy_cfg);
2368c2ecf20Sopenharmony_ci	if (IS_ERR(twl4030_madc_bat->psy)) {
2378c2ecf20Sopenharmony_ci		ret = PTR_ERR(twl4030_madc_bat->psy);
2388c2ecf20Sopenharmony_ci		goto err_vbat;
2398c2ecf20Sopenharmony_ci	}
2408c2ecf20Sopenharmony_ci
2418c2ecf20Sopenharmony_ci	return 0;
2428c2ecf20Sopenharmony_ci
2438c2ecf20Sopenharmony_cierr_vbat:
2448c2ecf20Sopenharmony_ci	iio_channel_release(twl4030_madc_bat->channel_vbat);
2458c2ecf20Sopenharmony_cierr_ichg:
2468c2ecf20Sopenharmony_ci	iio_channel_release(twl4030_madc_bat->channel_ichg);
2478c2ecf20Sopenharmony_cierr_temp:
2488c2ecf20Sopenharmony_ci	iio_channel_release(twl4030_madc_bat->channel_temp);
2498c2ecf20Sopenharmony_cierr:
2508c2ecf20Sopenharmony_ci	return ret;
2518c2ecf20Sopenharmony_ci}
2528c2ecf20Sopenharmony_ci
2538c2ecf20Sopenharmony_cistatic int twl4030_madc_battery_remove(struct platform_device *pdev)
2548c2ecf20Sopenharmony_ci{
2558c2ecf20Sopenharmony_ci	struct twl4030_madc_battery *bat = platform_get_drvdata(pdev);
2568c2ecf20Sopenharmony_ci
2578c2ecf20Sopenharmony_ci	power_supply_unregister(bat->psy);
2588c2ecf20Sopenharmony_ci
2598c2ecf20Sopenharmony_ci	iio_channel_release(bat->channel_vbat);
2608c2ecf20Sopenharmony_ci	iio_channel_release(bat->channel_ichg);
2618c2ecf20Sopenharmony_ci	iio_channel_release(bat->channel_temp);
2628c2ecf20Sopenharmony_ci
2638c2ecf20Sopenharmony_ci	return 0;
2648c2ecf20Sopenharmony_ci}
2658c2ecf20Sopenharmony_ci
2668c2ecf20Sopenharmony_cistatic struct platform_driver twl4030_madc_battery_driver = {
2678c2ecf20Sopenharmony_ci	.driver = {
2688c2ecf20Sopenharmony_ci		.name = "twl4030_madc_battery",
2698c2ecf20Sopenharmony_ci	},
2708c2ecf20Sopenharmony_ci	.probe  = twl4030_madc_battery_probe,
2718c2ecf20Sopenharmony_ci	.remove = twl4030_madc_battery_remove,
2728c2ecf20Sopenharmony_ci};
2738c2ecf20Sopenharmony_cimodule_platform_driver(twl4030_madc_battery_driver);
2748c2ecf20Sopenharmony_ci
2758c2ecf20Sopenharmony_ciMODULE_LICENSE("GPL");
2768c2ecf20Sopenharmony_ciMODULE_AUTHOR("Lukas Märdian <lukas@goldelico.com>");
2778c2ecf20Sopenharmony_ciMODULE_DESCRIPTION("twl4030_madc battery driver");
2788c2ecf20Sopenharmony_ciMODULE_ALIAS("platform:twl4030_madc_battery");
279