[linux-2.6-block.git] / drivers / power / supply / twl4030_madc_battery.c

/*
 * 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/power/twl4030_madc_battery.h>
#include <linux/iio/consumer.h>

struct twl4030_madc_battery {
	struct power_supply *psy;
	struct twl4030_madc_bat_platform_data *pdata;
	struct iio_channel *channel_temp;
	struct iio_channel *channel_ichg;
	struct iio_channel *channel_vbat;
};

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(struct iio_channel *channel)
{
	int val, err;
	err = iio_read_channel_processed(channel, &val);
	if (err < 0)
		return err;

	return val;
}

static int twl4030_madc_bat_get_charging_status(struct twl4030_madc_battery *bt)
{
	return (madc_read(bt->channel_ichg) > 0) ? 1 : 0;
}

static int twl4030_madc_bat_get_voltage(struct twl4030_madc_battery *bt)
{
	return madc_read(bt->channel_vbat);
}

static int twl4030_madc_bat_get_current(struct twl4030_madc_battery *bt)
{
	return madc_read(bt->channel_ichg) * 1000;
}

static int twl4030_madc_bat_get_temp(struct twl4030_madc_battery *bt)
{
	return madc_read(bt->channel_temp) * 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(bat))
		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 = power_supply_get_drvdata(psy);

	switch (psp) {
	case POWER_SUPPLY_PROP_STATUS:
		if (twl4030_madc_bat_voltscale(bat,
				twl4030_madc_bat_get_voltage(bat)) > 95)
			val->intval = POWER_SUPPLY_STATUS_FULL;
		else {
			if (twl4030_madc_bat_get_charging_status(bat))
				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(bat) * 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(bat);
		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(bat));
			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(bat));
		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(bat);
		break;
	case POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW: {
			int percent = twl4030_madc_bat_voltscale(bat,
					twl4030_madc_bat_get_voltage(bat));
			/* 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)
{
	power_supply_changed(psy);
}

static const struct power_supply_desc twl4030_madc_bat_desc = {
	.name			= "twl4030_battery",
	.type			= POWER_SUPPLY_TYPE_BATTERY,
	.properties		= twl4030_madc_bat_props,
	.num_properties		= ARRAY_SIZE(twl4030_madc_bat_props),
	.get_property		= twl4030_madc_bat_get_property,
	.external_power_changed	= twl4030_madc_bat_ext_changed,

};

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;
	struct power_supply_config psy_cfg = {};
	int ret = 0;

	twl4030_madc_bat = devm_kzalloc(&pdev->dev, sizeof(*twl4030_madc_bat),
				GFP_KERNEL);
	if (!twl4030_madc_bat)
		return -ENOMEM;

	twl4030_madc_bat->channel_temp = iio_channel_get(&pdev->dev, "temp");
	if (IS_ERR(twl4030_madc_bat->channel_temp)) {
		ret = PTR_ERR(twl4030_madc_bat->channel_temp);
		goto err;
	}

	twl4030_madc_bat->channel_ichg = iio_channel_get(&pdev->dev, "ichg");
	if (IS_ERR(twl4030_madc_bat->channel_ichg)) {
		ret = PTR_ERR(twl4030_madc_bat->channel_ichg);
		goto err_temp;
	}

	twl4030_madc_bat->channel_vbat = iio_channel_get(&pdev->dev, "vbat");
	if (IS_ERR(twl4030_madc_bat->channel_vbat)) {
		ret = PTR_ERR(twl4030_madc_bat->channel_vbat);
		goto err_ichg;
	}

	/* 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);
	psy_cfg.drv_data = twl4030_madc_bat;
	twl4030_madc_bat->psy = power_supply_register(&pdev->dev,
						      &twl4030_madc_bat_desc,
						      &psy_cfg);
	if (IS_ERR(twl4030_madc_bat->psy)) {
		ret = PTR_ERR(twl4030_madc_bat->psy);
		goto err_vbat;
	}

	return 0;

err_vbat:
	iio_channel_release(twl4030_madc_bat->channel_vbat);
err_ichg:
	iio_channel_release(twl4030_madc_bat->channel_ichg);
err_temp:
	iio_channel_release(twl4030_madc_bat->channel_temp);
err:
	return ret;
}

static int twl4030_madc_battery_remove(struct platform_device *pdev)
{
	struct twl4030_madc_battery *bat = platform_get_drvdata(pdev);

	power_supply_unregister(bat->psy);

	iio_channel_release(bat->channel_vbat);
	iio_channel_release(bat->channel_ichg);
	iio_channel_release(bat->channel_temp);

	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");
MODULE_ALIAS("platform:twl4030_madc_battery");
Commit	Line	Data
da0a00eb MB	1	/*
	2	* Dumb driver for LiIon batteries using TWL4030 madc.
	3	*
	4	* Copyright 2013 Golden Delicious Computers
	5	* Lukas Märdian <lukas@goldelico.com>
	6	*
	7	* Based on dumb driver for gta01 battery
	8	* Copyright 2009 Openmoko, Inc
	9	* Balaji Rao <balajirrao@openmoko.org>
	10	*/
	11
	12	#include <linux/module.h>
	13	#include <linux/param.h>
	14	#include <linux/delay.h>
	15	#include <linux/workqueue.h>
	16	#include <linux/platform_device.h>
	17	#include <linux/power_supply.h>
	18	#include <linux/slab.h>
	19	#include <linux/sort.h>
da0a00eb	20	#include <linux/power/twl4030_madc_battery.h>
7e5e4389	21	#include <linux/iio/consumer.h>
da0a00eb MB	22
da0a00eb MB	23	struct twl4030_madc_battery {
297d716f	24	struct power_supply *psy;
da0a00eb	25	struct twl4030_madc_bat_platform_data *pdata;
7e5e4389 MB	26	struct iio_channel *channel_temp;
	27	struct iio_channel *channel_ichg;
	28	struct iio_channel *channel_vbat;
da0a00eb MB	29	};
	30
	31	static enum power_supply_property twl4030_madc_bat_props[] = {
	32	POWER_SUPPLY_PROP_PRESENT,
	33	POWER_SUPPLY_PROP_STATUS,
	34	POWER_SUPPLY_PROP_TECHNOLOGY,
	35	POWER_SUPPLY_PROP_VOLTAGE_NOW,
	36	POWER_SUPPLY_PROP_CURRENT_NOW,
	37	POWER_SUPPLY_PROP_CAPACITY,
	38	POWER_SUPPLY_PROP_CHARGE_FULL,
	39	POWER_SUPPLY_PROP_CHARGE_NOW,
	40	POWER_SUPPLY_PROP_TEMP,
	41	POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
	42	};
	43
7e5e4389	44	static int madc_read(struct iio_channel *channel)
da0a00eb	45	{
7e5e4389 MB	46	int val, err;
	47	err = iio_read_channel_processed(channel, &val);
	48	if (err < 0)
	49	return err;
da0a00eb	50
7e5e4389	51	return val;
da0a00eb MB	52	}
da0a00eb MB	53
7e5e4389	54	static int twl4030_madc_bat_get_charging_status(struct twl4030_madc_battery *bt)
da0a00eb	55	{
7e5e4389	56	return (madc_read(bt->channel_ichg) > 0) ? 1 : 0;
da0a00eb MB	57	}
da0a00eb MB	58
7e5e4389	59	static int twl4030_madc_bat_get_voltage(struct twl4030_madc_battery *bt)
da0a00eb	60	{
7e5e4389	61	return madc_read(bt->channel_vbat);
da0a00eb MB	62	}
da0a00eb MB	63
7e5e4389	64	static int twl4030_madc_bat_get_current(struct twl4030_madc_battery *bt)
da0a00eb	65	{
7e5e4389	66	return madc_read(bt->channel_ichg) * 1000;
da0a00eb MB	67	}
da0a00eb MB	68
7e5e4389	69	static int twl4030_madc_bat_get_temp(struct twl4030_madc_battery *bt)
da0a00eb	70	{
7e5e4389	71	return madc_read(bt->channel_temp) * 10;
da0a00eb MB	72	}
	73
	74	static int twl4030_madc_bat_voltscale(struct twl4030_madc_battery *bat,
	75	int volt)
	76	{
	77	struct twl4030_madc_bat_calibration *calibration;
	78	int i, res = 0;
	79
	80	/* choose charging curve */
7e5e4389	81	if (twl4030_madc_bat_get_charging_status(bat))
da0a00eb MB	82	calibration = bat->pdata->charging;
	83	else
	84	calibration = bat->pdata->discharging;
	85
	86	if (volt > calibration[0].voltage) {
	87	res = calibration[0].level;
	88	} else {
	89	for (i = 0; calibration[i+1].voltage >= 0; i++) {
	90	if (volt <= calibration[i].voltage &&
	91	volt >= calibration[i+1].voltage) {
	92	/* interval found - interpolate within range */
	93	res = calibration[i].level -
	94	((calibration[i].voltage - volt) *
	95	(calibration[i].level -
	96	calibration[i+1].level)) /
	97	(calibration[i].voltage -
	98	calibration[i+1].voltage);
	99	break;
	100	}
	101	}
	102	}
	103	return res;
	104	}
	105
	106	static int twl4030_madc_bat_get_property(struct power_supply *psy,
	107	enum power_supply_property psp,
	108	union power_supply_propval *val)
	109	{
297d716f	110	struct twl4030_madc_battery *bat = power_supply_get_drvdata(psy);
da0a00eb MB	111
	112	switch (psp) {
	113	case POWER_SUPPLY_PROP_STATUS:
	114	if (twl4030_madc_bat_voltscale(bat,
7e5e4389	115	twl4030_madc_bat_get_voltage(bat)) > 95)
da0a00eb MB	116	val->intval = POWER_SUPPLY_STATUS_FULL;
da0a00eb MB	117	else {
7e5e4389	118	if (twl4030_madc_bat_get_charging_status(bat))
da0a00eb MB	119	val->intval = POWER_SUPPLY_STATUS_CHARGING;
	120	else
	121	val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
	122	}
	123	break;
	124	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
7e5e4389	125	val->intval = twl4030_madc_bat_get_voltage(bat) * 1000;
da0a00eb MB	126	break;
	127	case POWER_SUPPLY_PROP_TECHNOLOGY:
	128	val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
	129	break;
	130	case POWER_SUPPLY_PROP_CURRENT_NOW:
7e5e4389	131	val->intval = twl4030_madc_bat_get_current(bat);
da0a00eb MB	132	break;
	133	case POWER_SUPPLY_PROP_PRESENT:
	134	/* assume battery is always present */
	135	val->intval = 1;
	136	break;
	137	case POWER_SUPPLY_PROP_CHARGE_NOW: {
	138	int percent = twl4030_madc_bat_voltscale(bat,
7e5e4389	139	twl4030_madc_bat_get_voltage(bat));
da0a00eb MB	140	val->intval = (percent * bat->pdata->capacity) / 100;
	141	break;
	142	}
	143	case POWER_SUPPLY_PROP_CAPACITY:
	144	val->intval = twl4030_madc_bat_voltscale(bat,
7e5e4389	145	twl4030_madc_bat_get_voltage(bat));
da0a00eb MB	146	break;
	147	case POWER_SUPPLY_PROP_CHARGE_FULL:
	148	val->intval = bat->pdata->capacity;
	149	break;
	150	case POWER_SUPPLY_PROP_TEMP:
7e5e4389	151	val->intval = twl4030_madc_bat_get_temp(bat);
da0a00eb MB	152	break;
	153	case POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW: {
	154	int percent = twl4030_madc_bat_voltscale(bat,
7e5e4389	155	twl4030_madc_bat_get_voltage(bat));
da0a00eb MB	156	/* in mAh */
	157	int chg = (percent * (bat->pdata->capacity/1000))/100;
	158
	159	/* assume discharge with 400 mA (ca. 1.5W) */
	160	val->intval = (3600l * chg) / 400;
	161	break;
	162	}
	163	default:
	164	return -EINVAL;
	165	}
	166
	167	return 0;
	168	}
	169
	170	static void twl4030_madc_bat_ext_changed(struct power_supply *psy)
	171	{
297d716f	172	power_supply_changed(psy);
da0a00eb MB	173	}
da0a00eb MB	174
297d716f KK	175	static const struct power_supply_desc twl4030_madc_bat_desc = {
	176	.name = "twl4030_battery",
	177	.type = POWER_SUPPLY_TYPE_BATTERY,
	178	.properties = twl4030_madc_bat_props,
	179	.num_properties = ARRAY_SIZE(twl4030_madc_bat_props),
	180	.get_property = twl4030_madc_bat_get_property,
	181	.external_power_changed = twl4030_madc_bat_ext_changed,
	182
	183	};
	184
da0a00eb MB	185	static int twl4030_cmp(const void a, const void b)
	186	{
	187	return ((struct twl4030_madc_bat_calibration *)b)->voltage -
	188	((struct twl4030_madc_bat_calibration *)a)->voltage;
	189	}
	190
	191	static int twl4030_madc_battery_probe(struct platform_device *pdev)
	192	{
	193	struct twl4030_madc_battery *twl4030_madc_bat;
	194	struct twl4030_madc_bat_platform_data *pdata = pdev->dev.platform_data;
297d716f	195	struct power_supply_config psy_cfg = {};
68c3ed6f	196	int ret = 0;
da0a00eb	197
7e5e4389 MB	198	twl4030_madc_bat = devm_kzalloc(&pdev->dev, sizeof(*twl4030_madc_bat),
7e5e4389 MB	199	GFP_KERNEL);
da0a00eb MB	200	if (!twl4030_madc_bat)
	201	return -ENOMEM;
	202
7e5e4389 MB	203	twl4030_madc_bat->channel_temp = iio_channel_get(&pdev->dev, "temp");
	204	if (IS_ERR(twl4030_madc_bat->channel_temp)) {
	205	ret = PTR_ERR(twl4030_madc_bat->channel_temp);
	206	goto err;
	207	}
	208
	209	twl4030_madc_bat->channel_ichg = iio_channel_get(&pdev->dev, "ichg");
	210	if (IS_ERR(twl4030_madc_bat->channel_ichg)) {
	211	ret = PTR_ERR(twl4030_madc_bat->channel_ichg);
	212	goto err_temp;
	213	}
	214
	215	twl4030_madc_bat->channel_vbat = iio_channel_get(&pdev->dev, "vbat");
	216	if (IS_ERR(twl4030_madc_bat->channel_vbat)) {
	217	ret = PTR_ERR(twl4030_madc_bat->channel_vbat);
	218	goto err_ichg;
	219	}
	220
da0a00eb MB	221	/* sort charging and discharging calibration data */
	222	sort(pdata->charging, pdata->charging_size,
	223	sizeof(struct twl4030_madc_bat_calibration),
	224	twl4030_cmp, NULL);
	225	sort(pdata->discharging, pdata->discharging_size,
	226	sizeof(struct twl4030_madc_bat_calibration),
	227	twl4030_cmp, NULL);
	228
	229	twl4030_madc_bat->pdata = pdata;
	230	platform_set_drvdata(pdev, twl4030_madc_bat);
297d716f KK	231	psy_cfg.drv_data = twl4030_madc_bat;
	232	twl4030_madc_bat->psy = power_supply_register(&pdev->dev,
	233	&twl4030_madc_bat_desc,
	234	&psy_cfg);
	235	if (IS_ERR(twl4030_madc_bat->psy)) {
	236	ret = PTR_ERR(twl4030_madc_bat->psy);
7e5e4389	237	goto err_vbat;
297d716f	238	}
da0a00eb	239
7e5e4389 MB	240	return 0;
	241
	242	err_vbat:
	243	iio_channel_release(twl4030_madc_bat->channel_vbat);
	244	err_ichg:
	245	iio_channel_release(twl4030_madc_bat->channel_ichg);
	246	err_temp:
	247	iio_channel_release(twl4030_madc_bat->channel_temp);
	248	err:
68c3ed6f	249	return ret;
da0a00eb MB	250	}
	251
	252	static int twl4030_madc_battery_remove(struct platform_device *pdev)
	253	{
	254	struct twl4030_madc_battery *bat = platform_get_drvdata(pdev);
	255
297d716f	256	power_supply_unregister(bat->psy);
7e5e4389 MB	257
	258	iio_channel_release(bat->channel_vbat);
	259	iio_channel_release(bat->channel_ichg);
	260	iio_channel_release(bat->channel_temp);
da0a00eb MB	261
	262	return 0;
	263	}
	264
	265	static struct platform_driver twl4030_madc_battery_driver = {
	266	.driver = {
	267	.name = "twl4030_madc_battery",
	268	},
	269	.probe = twl4030_madc_battery_probe,
	270	.remove = twl4030_madc_battery_remove,
	271	};
	272	module_platform_driver(twl4030_madc_battery_driver);
	273
	274	MODULE_LICENSE("GPL");
	275	MODULE_AUTHOR("Lukas Märdian <lukas@goldelico.com>");
	276	MODULE_DESCRIPTION("twl4030_madc battery driver");
5939d9df	277	MODULE_ALIAS("platform:twl4030_madc_battery");