[net-next-2.6.git] / drivers / power / apm_power.c

/*
 * Copyright © 2007 Anton Vorontsov <cbou@mail.ru>
 * Copyright © 2007 Eugeny Boger <eugenyboger@dgap.mipt.ru>
 *
 * Author: Eugeny Boger <eugenyboger@dgap.mipt.ru>
 *
 * Use consistent with the GNU GPL is permitted,
 * provided that this copyright notice is
 * preserved in its entirety in all copies and derived works.
 */

#include <linux/module.h>
#include <linux/power_supply.h>
#include <linux/apm-emulation.h>


#define PSY_PROP(psy, prop, val) psy->get_property(psy, \
			 POWER_SUPPLY_PROP_##prop, val)

#define _MPSY_PROP(prop, val) main_battery->get_property(main_battery, \
							 prop, val)

#define MPSY_PROP(prop, val) _MPSY_PROP(POWER_SUPPLY_PROP_##prop, val)

static DEFINE_MUTEX(apm_mutex);
static struct power_supply *main_battery;

enum apm_source {
	SOURCE_ENERGY,
	SOURCE_CHARGE,
	SOURCE_VOLTAGE,
};

struct find_bat_param {
	struct power_supply *main;
	struct power_supply *bat;
	struct power_supply *max_charge_bat;
	struct power_supply *max_energy_bat;
	union power_supply_propval full;
	int max_charge;
	int max_energy;
};

static int __find_main_battery(struct device *dev, void *data)
{
	struct find_bat_param *bp = (struct find_bat_param *)data;

	bp->bat = dev_get_drvdata(dev);

	if (bp->bat->use_for_apm) {
		/* nice, we explicitly asked to report this battery. */
		bp->main = bp->bat;
		return 1;
	}

	if (!PSY_PROP(bp->bat, CHARGE_FULL_DESIGN, &bp->full) ||
			!PSY_PROP(bp->bat, CHARGE_FULL, &bp->full)) {
		if (bp->full.intval > bp->max_charge) {
			bp->max_charge_bat = bp->bat;
			bp->max_charge = bp->full.intval;
		}
	} else if (!PSY_PROP(bp->bat, ENERGY_FULL_DESIGN, &bp->full) ||
			!PSY_PROP(bp->bat, ENERGY_FULL, &bp->full)) {
		if (bp->full.intval > bp->max_energy) {
			bp->max_energy_bat = bp->bat;
			bp->max_energy = bp->full.intval;
		}
	}
	return 0;
}

static void find_main_battery(void)
{
	struct find_bat_param bp;
	int error;

	memset(&bp, 0, sizeof(struct find_bat_param));
	main_battery = NULL;
	bp.main = main_battery;

	error = class_for_each_device(power_supply_class, NULL, &bp,
				      __find_main_battery);
	if (error) {
		main_battery = bp.main;
		return;
	}

	if ((bp.max_energy_bat && bp.max_charge_bat) &&
			(bp.max_energy_bat != bp.max_charge_bat)) {
		/* try guess battery with more capacity */
		if (!PSY_PROP(bp.max_charge_bat, VOLTAGE_MAX_DESIGN,
			      &bp.full)) {
			if (bp.max_energy > bp.max_charge * bp.full.intval)
				main_battery = bp.max_energy_bat;
			else
				main_battery = bp.max_charge_bat;
		} else if (!PSY_PROP(bp.max_energy_bat, VOLTAGE_MAX_DESIGN,
								  &bp.full)) {
			if (bp.max_charge > bp.max_energy / bp.full.intval)
				main_battery = bp.max_charge_bat;
			else
				main_battery = bp.max_energy_bat;
		} else {
			/* give up, choice any */
			main_battery = bp.max_energy_bat;
		}
	} else if (bp.max_charge_bat) {
		main_battery = bp.max_charge_bat;
	} else if (bp.max_energy_bat) {
		main_battery = bp.max_energy_bat;
	} else {
		/* give up, try the last if any */
		main_battery = bp.bat;
	}
}

static int do_calculate_time(int status, enum apm_source source)
{
	union power_supply_propval full;
	union power_supply_propval empty;
	union power_supply_propval cur;
	union power_supply_propval I;
	enum power_supply_property full_prop;
	enum power_supply_property full_design_prop;
	enum power_supply_property empty_prop;
	enum power_supply_property empty_design_prop;
	enum power_supply_property cur_avg_prop;
	enum power_supply_property cur_now_prop;

	if (MPSY_PROP(CURRENT_AVG, &I)) {
		/* if battery can't report average value, use momentary */
		if (MPSY_PROP(CURRENT_NOW, &I))
			return -1;
	}

	if (!I.intval)
		return 0;

	switch (source) {
	case SOURCE_CHARGE:
		full_prop = POWER_SUPPLY_PROP_CHARGE_FULL;
		full_design_prop = POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN;
		empty_prop = POWER_SUPPLY_PROP_CHARGE_EMPTY;
		empty_design_prop = POWER_SUPPLY_PROP_CHARGE_EMPTY;
		cur_avg_prop = POWER_SUPPLY_PROP_CHARGE_AVG;
		cur_now_prop = POWER_SUPPLY_PROP_CHARGE_NOW;
		break;
	case SOURCE_ENERGY:
		full_prop = POWER_SUPPLY_PROP_ENERGY_FULL;
		full_design_prop = POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN;
		empty_prop = POWER_SUPPLY_PROP_ENERGY_EMPTY;
		empty_design_prop = POWER_SUPPLY_PROP_CHARGE_EMPTY;
		cur_avg_prop = POWER_SUPPLY_PROP_ENERGY_AVG;
		cur_now_prop = POWER_SUPPLY_PROP_ENERGY_NOW;
		break;
	case SOURCE_VOLTAGE:
		full_prop = POWER_SUPPLY_PROP_VOLTAGE_MAX;
		full_design_prop = POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN;
		empty_prop = POWER_SUPPLY_PROP_VOLTAGE_MIN;
		empty_design_prop = POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN;
		cur_avg_prop = POWER_SUPPLY_PROP_VOLTAGE_AVG;
		cur_now_prop = POWER_SUPPLY_PROP_VOLTAGE_NOW;
		break;
	default:
		printk(KERN_ERR "Unsupported source: %d\n", source);
		return -1;
	}

	if (_MPSY_PROP(full_prop, &full)) {
		/* if battery can't report this property, use design value */
		if (_MPSY_PROP(full_design_prop, &full))
			return -1;
	}

	if (_MPSY_PROP(empty_prop, &empty)) {
		/* if battery can't report this property, use design value */
		if (_MPSY_PROP(empty_design_prop, &empty))
			empty.intval = 0;
	}

	if (_MPSY_PROP(cur_avg_prop, &cur)) {
		/* if battery can't report average value, use momentary */
		if (_MPSY_PROP(cur_now_prop, &cur))
			return -1;
	}

	if (status == POWER_SUPPLY_STATUS_CHARGING)
		return ((cur.intval - full.intval) * 60L) / I.intval;
	else
		return -((cur.intval - empty.intval) * 60L) / I.intval;
}

static int calculate_time(int status)
{
	int time;

	time = do_calculate_time(status, SOURCE_ENERGY);
	if (time != -1)
		return time;

	time = do_calculate_time(status, SOURCE_CHARGE);
	if (time != -1)
		return time;

	time = do_calculate_time(status, SOURCE_VOLTAGE);
	if (time != -1)
		return time;

	return -1;
}

static int calculate_capacity(enum apm_source source)
{
	enum power_supply_property full_prop, empty_prop;
	enum power_supply_property full_design_prop, empty_design_prop;
	enum power_supply_property now_prop, avg_prop;
	union power_supply_propval empty, full, cur;
	int ret;

	switch (source) {
	case SOURCE_CHARGE:
		full_prop = POWER_SUPPLY_PROP_CHARGE_FULL;
		empty_prop = POWER_SUPPLY_PROP_CHARGE_EMPTY;
		full_design_prop = POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN;
		empty_design_prop = POWER_SUPPLY_PROP_CHARGE_EMPTY_DESIGN;
		now_prop = POWER_SUPPLY_PROP_CHARGE_NOW;
		avg_prop = POWER_SUPPLY_PROP_CHARGE_AVG;
		break;
	case SOURCE_ENERGY:
		full_prop = POWER_SUPPLY_PROP_ENERGY_FULL;
		empty_prop = POWER_SUPPLY_PROP_ENERGY_EMPTY;
		full_design_prop = POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN;
		empty_design_prop = POWER_SUPPLY_PROP_ENERGY_EMPTY_DESIGN;
		now_prop = POWER_SUPPLY_PROP_ENERGY_NOW;
		avg_prop = POWER_SUPPLY_PROP_ENERGY_AVG;
		break;
	case SOURCE_VOLTAGE:
		full_prop = POWER_SUPPLY_PROP_VOLTAGE_MAX;
		empty_prop = POWER_SUPPLY_PROP_VOLTAGE_MIN;
		full_design_prop = POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN;
		empty_design_prop = POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN;
		now_prop = POWER_SUPPLY_PROP_VOLTAGE_NOW;
		avg_prop = POWER_SUPPLY_PROP_VOLTAGE_AVG;
		break;
	default:
		printk(KERN_ERR "Unsupported source: %d\n", source);
		return -1;
	}

	if (_MPSY_PROP(full_prop, &full)) {
		/* if battery can't report this property, use design value */
		if (_MPSY_PROP(full_design_prop, &full))
			return -1;
	}

	if (_MPSY_PROP(avg_prop, &cur)) {
		/* if battery can't report average value, use momentary */
		if (_MPSY_PROP(now_prop, &cur))
			return -1;
	}

	if (_MPSY_PROP(empty_prop, &empty)) {
		/* if battery can't report this property, use design value */
		if (_MPSY_PROP(empty_design_prop, &empty))
			empty.intval = 0;
	}

	if (full.intval - empty.intval)
		ret =  ((cur.intval - empty.intval) * 100L) /
		       (full.intval - empty.intval);
	else
		return -1;

	if (ret > 100)
		return 100;
	else if (ret < 0)
		return 0;

	return ret;
}

static void apm_battery_apm_get_power_status(struct apm_power_info *info)
{
	union power_supply_propval status;
	union power_supply_propval capacity, time_to_full, time_to_empty;

	mutex_lock(&apm_mutex);
	find_main_battery();
	if (!main_battery) {
		mutex_unlock(&apm_mutex);
		return;
	}

	/* status */

	if (MPSY_PROP(STATUS, &status))
		status.intval = POWER_SUPPLY_STATUS_UNKNOWN;

	/* ac line status */

	if ((status.intval == POWER_SUPPLY_STATUS_CHARGING) ||
	    (status.intval == POWER_SUPPLY_STATUS_NOT_CHARGING) ||
	    (status.intval == POWER_SUPPLY_STATUS_FULL))
		info->ac_line_status = APM_AC_ONLINE;
	else
		info->ac_line_status = APM_AC_OFFLINE;

	/* battery life (i.e. capacity, in percents) */

	if (MPSY_PROP(CAPACITY, &capacity) == 0) {
		info->battery_life = capacity.intval;
	} else {
		/* try calculate using energy */
		info->battery_life = calculate_capacity(SOURCE_ENERGY);
		/* if failed try calculate using charge instead */
		if (info->battery_life == -1)
			info->battery_life = calculate_capacity(SOURCE_CHARGE);
		if (info->battery_life == -1)
			info->battery_life = calculate_capacity(SOURCE_VOLTAGE);
	}

	/* charging status */

	if (status.intval == POWER_SUPPLY_STATUS_CHARGING) {
		info->battery_status = APM_BATTERY_STATUS_CHARGING;
	} else {
		if (info->battery_life > 50)
			info->battery_status = APM_BATTERY_STATUS_HIGH;
		else if (info->battery_life > 5)
			info->battery_status = APM_BATTERY_STATUS_LOW;
		else
			info->battery_status = APM_BATTERY_STATUS_CRITICAL;
	}
	info->battery_flag = info->battery_status;

	/* time */

	info->units = APM_UNITS_MINS;

	if (status.intval == POWER_SUPPLY_STATUS_CHARGING) {
		if (!MPSY_PROP(TIME_TO_FULL_AVG, &time_to_full) ||
				!MPSY_PROP(TIME_TO_FULL_NOW, &time_to_full))
			info->time = time_to_full.intval / 60;
		else
			info->time = calculate_time(status.intval);
	} else {
		if (!MPSY_PROP(TIME_TO_EMPTY_AVG, &time_to_empty) ||
			      !MPSY_PROP(TIME_TO_EMPTY_NOW, &time_to_empty))
			info->time = time_to_empty.intval / 60;
		else
			info->time = calculate_time(status.intval);
	}

	mutex_unlock(&apm_mutex);
}

static int __init apm_battery_init(void)
{
	printk(KERN_INFO "APM Battery Driver\n");

	apm_get_power_status = apm_battery_apm_get_power_status;
	return 0;
}

static void __exit apm_battery_exit(void)
{
	apm_get_power_status = NULL;
}

module_init(apm_battery_init);
module_exit(apm_battery_exit);

MODULE_AUTHOR("Eugeny Boger <eugenyboger@dgap.mipt.ru>");
MODULE_DESCRIPTION("APM emulation driver for battery monitoring class");
MODULE_LICENSE("GPL");
Commit	Line	Data
3788ec93 AV	1	/*
	2	* Copyright © 2007 Anton Vorontsov <cbou@mail.ru>
	3	* Copyright © 2007 Eugeny Boger <eugenyboger@dgap.mipt.ru>
	4	*
	5	* Author: Eugeny Boger <eugenyboger@dgap.mipt.ru>
	6	*
	7	* Use consistent with the GNU GPL is permitted,
	8	* provided that this copyright notice is
	9	* preserved in its entirety in all copies and derived works.
	10	*/
	11
	12	#include <linux/module.h>
	13	#include <linux/power_supply.h>
	14	#include <linux/apm-emulation.h>
	15
dffd28a1	16
3788ec93 AV	17	#define PSY_PROP(psy, prop, val) psy->get_property(psy, \
	18	POWER_SUPPLY_PROP_##prop, val)
	19
	20	#define _MPSY_PROP(prop, val) main_battery->get_property(main_battery, \
	21	prop, val)
	22
	23	#define MPSY_PROP(prop, val) _MPSY_PROP(POWER_SUPPLY_PROP_##prop, val)
	24
dffd28a1	25	static DEFINE_MUTEX(apm_mutex);
3788ec93 AV	26	static struct power_supply *main_battery;
3788ec93 AV	27
dffd28a1 DES	28	enum apm_source {
	29	SOURCE_ENERGY,
	30	SOURCE_CHARGE,
	31	SOURCE_VOLTAGE,
	32	};
	33
443cad92 DY	34	struct find_bat_param {
	35	struct power_supply *main;
	36	struct power_supply *bat;
	37	struct power_supply *max_charge_bat;
	38	struct power_supply *max_energy_bat;
3788ec93	39	union power_supply_propval full;
443cad92 DY	40	int max_charge;
	41	int max_energy;
	42	};
3788ec93	43
443cad92 DY	44	static int __find_main_battery(struct device dev, void data)
	45	{
	46	struct find_bat_param bp = (struct find_bat_param )data;
d385376f	47
443cad92	48	bp->bat = dev_get_drvdata(dev);
d385376f	49
443cad92 DY	50	if (bp->bat->use_for_apm) {
	51	/* nice, we explicitly asked to report this battery. */
	52	bp->main = bp->bat;
	53	return 1;
	54	}
d385376f	55
443cad92 DY	56	if (!PSY_PROP(bp->bat, CHARGE_FULL_DESIGN, &bp->full) \|\|
	57	!PSY_PROP(bp->bat, CHARGE_FULL, &bp->full)) {
	58	if (bp->full.intval > bp->max_charge) {
	59	bp->max_charge_bat = bp->bat;
	60	bp->max_charge = bp->full.intval;
	61	}
	62	} else if (!PSY_PROP(bp->bat, ENERGY_FULL_DESIGN, &bp->full) \|\|
	63	!PSY_PROP(bp->bat, ENERGY_FULL, &bp->full)) {
	64	if (bp->full.intval > bp->max_energy) {
	65	bp->max_energy_bat = bp->bat;
	66	bp->max_energy = bp->full.intval;
3788ec93	67	}
d385376f	68	}
443cad92 DY	69	return 0;
	70	}
	71
	72	static void find_main_battery(void)
	73	{
	74	struct find_bat_param bp;
	75	int error;
	76
	77	memset(&bp, 0, sizeof(struct find_bat_param));
	78	main_battery = NULL;
	79	bp.main = main_battery;
	80
93562b53	81	error = class_for_each_device(power_supply_class, NULL, &bp,
443cad92 DY	82	__find_main_battery);
	83	if (error) {
	84	main_battery = bp.main;
	85	return;
	86	}
3788ec93	87
443cad92 DY	88	if ((bp.max_energy_bat && bp.max_charge_bat) &&
443cad92 DY	89	(bp.max_energy_bat != bp.max_charge_bat)) {
d385376f	90	/* try guess battery with more capacity */
443cad92 DY	91	if (!PSY_PROP(bp.max_charge_bat, VOLTAGE_MAX_DESIGN,
	92	&bp.full)) {
	93	if (bp.max_energy > bp.max_charge * bp.full.intval)
	94	main_battery = bp.max_energy_bat;
d385376f	95	else
443cad92 DY	96	main_battery = bp.max_charge_bat;
	97	} else if (!PSY_PROP(bp.max_energy_bat, VOLTAGE_MAX_DESIGN,
	98	&bp.full)) {
	99	if (bp.max_charge > bp.max_energy / bp.full.intval)
	100	main_battery = bp.max_charge_bat;
d385376f	101	else
443cad92	102	main_battery = bp.max_energy_bat;
d385376f AV	103	} else {
d385376f AV	104	/* give up, choice any */
443cad92	105	main_battery = bp.max_energy_bat;
d385376f	106	}
443cad92 DY	107	} else if (bp.max_charge_bat) {
	108	main_battery = bp.max_charge_bat;
	109	} else if (bp.max_energy_bat) {
	110	main_battery = bp.max_energy_bat;
d385376f AV	111	} else {
d385376f AV	112	/* give up, try the last if any */
443cad92	113	main_battery = bp.bat;
3788ec93	114	}
3788ec93 AV	115	}
3788ec93 AV	116
dffd28a1	117	static int do_calculate_time(int status, enum apm_source source)
3788ec93	118	{
2a721dfc AV	119	union power_supply_propval full;
	120	union power_supply_propval empty;
	121	union power_supply_propval cur;
	122	union power_supply_propval I;
	123	enum power_supply_property full_prop;
	124	enum power_supply_property full_design_prop;
	125	enum power_supply_property empty_prop;
	126	enum power_supply_property empty_design_prop;
	127	enum power_supply_property cur_avg_prop;
	128	enum power_supply_property cur_now_prop;
3788ec93	129
2a721dfc AV	130	if (MPSY_PROP(CURRENT_AVG, &I)) {
	131	/* if battery can't report average value, use momentary */
	132	if (MPSY_PROP(CURRENT_NOW, &I))
3788ec93 AV	133	return -1;
	134	}
	135
e91926e9 AV	136	if (!I.intval)
	137	return 0;
	138
dffd28a1 DES	139	switch (source) {
dffd28a1 DES	140	case SOURCE_CHARGE:
2a721dfc AV	141	full_prop = POWER_SUPPLY_PROP_CHARGE_FULL;
	142	full_design_prop = POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN;
	143	empty_prop = POWER_SUPPLY_PROP_CHARGE_EMPTY;
	144	empty_design_prop = POWER_SUPPLY_PROP_CHARGE_EMPTY;
	145	cur_avg_prop = POWER_SUPPLY_PROP_CHARGE_AVG;
	146	cur_now_prop = POWER_SUPPLY_PROP_CHARGE_NOW;
dffd28a1 DES	147	break;
dffd28a1 DES	148	case SOURCE_ENERGY:
2a721dfc AV	149	full_prop = POWER_SUPPLY_PROP_ENERGY_FULL;
	150	full_design_prop = POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN;
	151	empty_prop = POWER_SUPPLY_PROP_ENERGY_EMPTY;
	152	empty_design_prop = POWER_SUPPLY_PROP_CHARGE_EMPTY;
	153	cur_avg_prop = POWER_SUPPLY_PROP_ENERGY_AVG;
	154	cur_now_prop = POWER_SUPPLY_PROP_ENERGY_NOW;
dffd28a1 DES	155	break;
	156	case SOURCE_VOLTAGE:
	157	full_prop = POWER_SUPPLY_PROP_VOLTAGE_MAX;
	158	full_design_prop = POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN;
	159	empty_prop = POWER_SUPPLY_PROP_VOLTAGE_MIN;
	160	empty_design_prop = POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN;
	161	cur_avg_prop = POWER_SUPPLY_PROP_VOLTAGE_AVG;
	162	cur_now_prop = POWER_SUPPLY_PROP_VOLTAGE_NOW;
	163	break;
	164	default:
	165	printk(KERN_ERR "Unsupported source: %d\n", source);
	166	return -1;
3788ec93 AV	167	}
3788ec93 AV	168
2a721dfc AV	169	if (_MPSY_PROP(full_prop, &full)) {
	170	/* if battery can't report this property, use design value */
	171	if (_MPSY_PROP(full_design_prop, &full))
3788ec93 AV	172	return -1;
	173	}
	174
2a721dfc AV	175	if (_MPSY_PROP(empty_prop, &empty)) {
	176	/* if battery can't report this property, use design value */
	177	if (_MPSY_PROP(empty_design_prop, &empty))
	178	empty.intval = 0;
	179	}
	180
	181	if (_MPSY_PROP(cur_avg_prop, &cur)) {
3788ec93	182	/* if battery can't report average value, use momentary */
2a721dfc	183	if (_MPSY_PROP(cur_now_prop, &cur))
3788ec93 AV	184	return -1;
	185	}
	186
	187	if (status == POWER_SUPPLY_STATUS_CHARGING)
2a721dfc	188	return ((cur.intval - full.intval) * 60L) / I.intval;
3788ec93	189	else
2a721dfc	190	return -((cur.intval - empty.intval) * 60L) / I.intval;
3788ec93 AV	191	}
3788ec93 AV	192
dffd28a1 DES	193	static int calculate_time(int status)
	194	{
	195	int time;
	196
	197	time = do_calculate_time(status, SOURCE_ENERGY);
	198	if (time != -1)
	199	return time;
	200
	201	time = do_calculate_time(status, SOURCE_CHARGE);
	202	if (time != -1)
	203	return time;
	204
	205	time = do_calculate_time(status, SOURCE_VOLTAGE);
	206	if (time != -1)
	207	return time;
	208
	209	return -1;
	210	}
	211
	212	static int calculate_capacity(enum apm_source source)
3788ec93 AV	213	{
	214	enum power_supply_property full_prop, empty_prop;
	215	enum power_supply_property full_design_prop, empty_design_prop;
	216	enum power_supply_property now_prop, avg_prop;
	217	union power_supply_propval empty, full, cur;
	218	int ret;
	219
dffd28a1 DES	220	switch (source) {
dffd28a1 DES	221	case SOURCE_CHARGE:
3788ec93 AV	222	full_prop = POWER_SUPPLY_PROP_CHARGE_FULL;
	223	empty_prop = POWER_SUPPLY_PROP_CHARGE_EMPTY;
	224	full_design_prop = POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN;
	225	empty_design_prop = POWER_SUPPLY_PROP_CHARGE_EMPTY_DESIGN;
	226	now_prop = POWER_SUPPLY_PROP_CHARGE_NOW;
	227	avg_prop = POWER_SUPPLY_PROP_CHARGE_AVG;
dffd28a1 DES	228	break;
dffd28a1 DES	229	case SOURCE_ENERGY:
3788ec93 AV	230	full_prop = POWER_SUPPLY_PROP_ENERGY_FULL;
	231	empty_prop = POWER_SUPPLY_PROP_ENERGY_EMPTY;
	232	full_design_prop = POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN;
	233	empty_design_prop = POWER_SUPPLY_PROP_ENERGY_EMPTY_DESIGN;
	234	now_prop = POWER_SUPPLY_PROP_ENERGY_NOW;
	235	avg_prop = POWER_SUPPLY_PROP_ENERGY_AVG;
1d220334	236	break;
dffd28a1 DES	237	case SOURCE_VOLTAGE:
	238	full_prop = POWER_SUPPLY_PROP_VOLTAGE_MAX;
	239	empty_prop = POWER_SUPPLY_PROP_VOLTAGE_MIN;
	240	full_design_prop = POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN;
	241	empty_design_prop = POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN;
	242	now_prop = POWER_SUPPLY_PROP_VOLTAGE_NOW;
	243	avg_prop = POWER_SUPPLY_PROP_VOLTAGE_AVG;
	244	break;
	245	default:
	246	printk(KERN_ERR "Unsupported source: %d\n", source);
	247	return -1;
3788ec93 AV	248	}
	249
	250	if (_MPSY_PROP(full_prop, &full)) {
	251	/* if battery can't report this property, use design value */
	252	if (_MPSY_PROP(full_design_prop, &full))
	253	return -1;
	254	}
	255
	256	if (_MPSY_PROP(avg_prop, &cur)) {
	257	/* if battery can't report average value, use momentary */
	258	if (_MPSY_PROP(now_prop, &cur))
	259	return -1;
	260	}
	261
	262	if (_MPSY_PROP(empty_prop, &empty)) {
	263	/* if battery can't report this property, use design value */
	264	if (_MPSY_PROP(empty_design_prop, &empty))
	265	empty.intval = 0;
	266	}
	267
	268	if (full.intval - empty.intval)
	269	ret = ((cur.intval - empty.intval) * 100L) /
	270	(full.intval - empty.intval);
	271	else
	272	return -1;
	273
	274	if (ret > 100)
	275	return 100;
	276	else if (ret < 0)
	277	return 0;
	278
	279	return ret;
	280	}
	281
	282	static void apm_battery_apm_get_power_status(struct apm_power_info *info)
	283	{
	284	union power_supply_propval status;
	285	union power_supply_propval capacity, time_to_full, time_to_empty;
	286
443cad92	287	mutex_lock(&apm_mutex);
3788ec93 AV	288	find_main_battery();
3788ec93 AV	289	if (!main_battery) {
443cad92	290	mutex_unlock(&apm_mutex);
3788ec93 AV	291	return;
	292	}
	293
	294	/* status */
	295
	296	if (MPSY_PROP(STATUS, &status))
	297	status.intval = POWER_SUPPLY_STATUS_UNKNOWN;
	298
	299	/* ac line status */
	300
	301	if ((status.intval == POWER_SUPPLY_STATUS_CHARGING) \|\|
	302	(status.intval == POWER_SUPPLY_STATUS_NOT_CHARGING) \|\|
	303	(status.intval == POWER_SUPPLY_STATUS_FULL))
	304	info->ac_line_status = APM_AC_ONLINE;
	305	else
	306	info->ac_line_status = APM_AC_OFFLINE;
	307
	308	/* battery life (i.e. capacity, in percents) */
	309
	310	if (MPSY_PROP(CAPACITY, &capacity) == 0) {
	311	info->battery_life = capacity.intval;
	312	} else {
	313	/* try calculate using energy */
dffd28a1	314	info->battery_life = calculate_capacity(SOURCE_ENERGY);
3788ec93 AV	315	/* if failed try calculate using charge instead */
3788ec93 AV	316	if (info->battery_life == -1)
dffd28a1 DES	317	info->battery_life = calculate_capacity(SOURCE_CHARGE);
	318	if (info->battery_life == -1)
	319	info->battery_life = calculate_capacity(SOURCE_VOLTAGE);
3788ec93 AV	320	}
	321
	322	/* charging status */
	323
	324	if (status.intval == POWER_SUPPLY_STATUS_CHARGING) {
	325	info->battery_status = APM_BATTERY_STATUS_CHARGING;
	326	} else {
	327	if (info->battery_life > 50)
	328	info->battery_status = APM_BATTERY_STATUS_HIGH;
	329	else if (info->battery_life > 5)
	330	info->battery_status = APM_BATTERY_STATUS_LOW;
	331	else
	332	info->battery_status = APM_BATTERY_STATUS_CRITICAL;
	333	}
	334	info->battery_flag = info->battery_status;
	335
	336	/* time */
	337
	338	info->units = APM_UNITS_MINS;
	339
	340	if (status.intval == POWER_SUPPLY_STATUS_CHARGING) {
cd1ebcc0	341	if (!MPSY_PROP(TIME_TO_FULL_AVG, &time_to_full) \|\|
dffd28a1	342	!MPSY_PROP(TIME_TO_FULL_NOW, &time_to_full))
cd1ebcc0	343	info->time = time_to_full.intval / 60;
dffd28a1 DES	344	else
dffd28a1 DES	345	info->time = calculate_time(status.intval);
3788ec93	346	} else {
cd1ebcc0	347	if (!MPSY_PROP(TIME_TO_EMPTY_AVG, &time_to_empty) \|\|
dffd28a1	348	!MPSY_PROP(TIME_TO_EMPTY_NOW, &time_to_empty))
cd1ebcc0	349	info->time = time_to_empty.intval / 60;
dffd28a1 DES	350	else
dffd28a1 DES	351	info->time = calculate_time(status.intval);
3788ec93 AV	352	}
3788ec93 AV	353
443cad92	354	mutex_unlock(&apm_mutex);
3788ec93 AV	355	}
	356
	357	static int __init apm_battery_init(void)
	358	{
	359	printk(KERN_INFO "APM Battery Driver\n");
	360
	361	apm_get_power_status = apm_battery_apm_get_power_status;
	362	return 0;
	363	}
	364
	365	static void __exit apm_battery_exit(void)
	366	{
	367	apm_get_power_status = NULL;
3788ec93 AV	368	}
	369
	370	module_init(apm_battery_init);
	371	module_exit(apm_battery_exit);
	372
	373	MODULE_AUTHOR("Eugeny Boger <eugenyboger@dgap.mipt.ru>");
	374	MODULE_DESCRIPTION("APM emulation driver for battery monitoring class");
	375	MODULE_LICENSE("GPL");