[deliverable/linux.git] / drivers / power / ds2760_battery.c

/*
 * Driver for batteries with DS2760 chips inside.
 *
 * Copyright © 2007 Anton Vorontsov
 *	       2004-2007 Matt Reimer
 *	       2004 Szabolcs Gyurko
 *
 * Use consistent with the GNU GPL is permitted,
 * provided that this copyright notice is
 * preserved in its entirety in all copies and derived works.
 *
 * Author:  Anton Vorontsov <cbou@mail.ru>
 *	    February 2007
 *
 *	    Matt Reimer <mreimer@vpop.net>
 *	    April 2004, 2005, 2007
 *
 *	    Szabolcs Gyurko <szabolcs.gyurko@tlt.hu>
 *	    September 2004
 */

#include <linux/module.h>
#include <linux/param.h>
#include <linux/jiffies.h>
#include <linux/workqueue.h>
#include <linux/pm.h>
#include <linux/slab.h>
#include <linux/platform_device.h>
#include <linux/power_supply.h>

#include "../w1/w1.h"
#include "../w1/slaves/w1_ds2760.h"

struct ds2760_device_info {
	struct device *dev;

	/* DS2760 data, valid after calling ds2760_battery_read_status() */
	unsigned long update_time;	/* jiffies when data read */
	char raw[DS2760_DATA_SIZE];	/* raw DS2760 data */
	int voltage_raw;		/* units of 4.88 mV */
	int voltage_uV;			/* units of µV */
	int current_raw;		/* units of 0.625 mA */
	int current_uA;			/* units of µA */
	int accum_current_raw;		/* units of 0.25 mAh */
	int accum_current_uAh;		/* units of µAh */
	int temp_raw;			/* units of 0.125 °C */
	int temp_C;			/* units of 0.1 °C */
	int rated_capacity;		/* units of µAh */
	int rem_capacity;		/* percentage */
	int full_active_uAh;		/* units of µAh */
	int empty_uAh;			/* units of µAh */
	int life_sec;			/* units of seconds */
	int charge_status;		/* POWER_SUPPLY_STATUS_* */

	int full_counter;
	struct power_supply bat;
	struct device *w1_dev;
	struct workqueue_struct *monitor_wqueue;
	struct delayed_work monitor_work;
	struct delayed_work set_charged_work;
};

static unsigned int cache_time = 1000;
module_param(cache_time, uint, 0644);
MODULE_PARM_DESC(cache_time, "cache time in milliseconds");

static unsigned int pmod_enabled;
module_param(pmod_enabled, bool, 0644);
MODULE_PARM_DESC(pmod_enabled, "PMOD enable bit");

static unsigned int rated_capacity;
module_param(rated_capacity, uint, 0644);
MODULE_PARM_DESC(rated_capacity, "rated battery capacity, 10*mAh or index");

static unsigned int current_accum;
module_param(current_accum, uint, 0644);
MODULE_PARM_DESC(current_accum, "current accumulator value");

/* Some batteries have their rated capacity stored a N * 10 mAh, while
 * others use an index into this table. */
static int rated_capacities[] = {
	0,
	920,	/* Samsung */
	920,	/* BYD */
	920,	/* Lishen */
	920,	/* NEC */
	1440,	/* Samsung */
	1440,	/* BYD */
#ifdef CONFIG_MACH_H4700
	1800,	/* HP iPAQ hx4700 3.7V 1800mAh (359113-001) */
#else
	1440,	/* Lishen */
#endif
	1440,	/* NEC */
	2880,	/* Samsung */
	2880,	/* BYD */
	2880,	/* Lishen */
	2880	/* NEC */
};

/* array is level at temps 0°C, 10°C, 20°C, 30°C, 40°C
 * temp is in Celsius */
static int battery_interpolate(int array[], int temp)
{
	int index, dt;

	if (temp <= 0)
		return array[0];
	if (temp >= 40)
		return array[4];

	index = temp / 10;
	dt    = temp % 10;

	return array[index] + (((array[index + 1] - array[index]) * dt) / 10);
}

static int ds2760_battery_read_status(struct ds2760_device_info *di)
{
	int ret, i, start, count, scale[5];

	if (di->update_time && time_before(jiffies, di->update_time +
					   msecs_to_jiffies(cache_time)))
		return 0;

	/* The first time we read the entire contents of SRAM/EEPROM,
	 * but after that we just read the interesting bits that change. */
	if (di->update_time == 0) {
		start = 0;
		count = DS2760_DATA_SIZE;
	} else {
		start = DS2760_VOLTAGE_MSB;
		count = DS2760_TEMP_LSB - start + 1;
	}

	ret = w1_ds2760_read(di->w1_dev, di->raw + start, start, count);
	if (ret != count) {
		dev_warn(di->dev, "call to w1_ds2760_read failed (0x%p)\n",
			 di->w1_dev);
		return 1;
	}

	di->update_time = jiffies;

	/* DS2760 reports voltage in units of 4.88mV, but the battery class
	 * reports in units of uV, so convert by multiplying by 4880. */
	di->voltage_raw = (di->raw[DS2760_VOLTAGE_MSB] << 3) |
			  (di->raw[DS2760_VOLTAGE_LSB] >> 5);
	di->voltage_uV = di->voltage_raw * 4880;

	/* DS2760 reports current in signed units of 0.625mA, but the battery
	 * class reports in units of µA, so convert by multiplying by 625. */
	di->current_raw =
	    (((signed char)di->raw[DS2760_CURRENT_MSB]) << 5) |
			  (di->raw[DS2760_CURRENT_LSB] >> 3);
	di->current_uA = di->current_raw * 625;

	/* DS2760 reports accumulated current in signed units of 0.25mAh. */
	di->accum_current_raw =
	    (((signed char)di->raw[DS2760_CURRENT_ACCUM_MSB]) << 8) |
			   di->raw[DS2760_CURRENT_ACCUM_LSB];
	di->accum_current_uAh = di->accum_current_raw * 250;

	/* DS2760 reports temperature in signed units of 0.125°C, but the
	 * battery class reports in units of 1/10 °C, so we convert by
	 * multiplying by .125 * 10 = 1.25. */
	di->temp_raw = (((signed char)di->raw[DS2760_TEMP_MSB]) << 3) |
				     (di->raw[DS2760_TEMP_LSB] >> 5);
	di->temp_C = di->temp_raw + (di->temp_raw / 4);

	/* At least some battery monitors (e.g. HP iPAQ) store the battery's
	 * maximum rated capacity. */
	if (di->raw[DS2760_RATED_CAPACITY] < ARRAY_SIZE(rated_capacities))
		di->rated_capacity = rated_capacities[
			(unsigned int)di->raw[DS2760_RATED_CAPACITY]];
	else
		di->rated_capacity = di->raw[DS2760_RATED_CAPACITY] * 10;

	di->rated_capacity *= 1000; /* convert to µAh */

	/* Calculate the full level at the present temperature. */
	di->full_active_uAh = di->raw[DS2760_ACTIVE_FULL] << 8 |
			      di->raw[DS2760_ACTIVE_FULL + 1];

	/* If the full_active_uAh value is not given, fall back to the rated
	 * capacity. This is likely to happen when chips are not part of the
	 * battery pack and is therefore not bootstrapped. */
	if (di->full_active_uAh == 0)
		di->full_active_uAh = di->rated_capacity / 1000L;

	scale[0] = di->full_active_uAh;
	for (i = 1; i < 5; i++)
		scale[i] = scale[i - 1] + di->raw[DS2760_ACTIVE_FULL + 1 + i];

	di->full_active_uAh = battery_interpolate(scale, di->temp_C / 10);
	di->full_active_uAh *= 1000; /* convert to µAh */

	/* Calculate the empty level at the present temperature. */
	scale[4] = di->raw[DS2760_ACTIVE_EMPTY + 4];
	for (i = 3; i >= 0; i--)
		scale[i] = scale[i + 1] + di->raw[DS2760_ACTIVE_EMPTY + i];

	di->empty_uAh = battery_interpolate(scale, di->temp_C / 10);
	di->empty_uAh *= 1000; /* convert to µAh */

	if (di->full_active_uAh == di->empty_uAh)
		di->rem_capacity = 0;
	else
		/* From Maxim Application Note 131: remaining capacity =
		 * ((ICA - Empty Value) / (Full Value - Empty Value)) x 100% */
		di->rem_capacity = ((di->accum_current_uAh - di->empty_uAh) * 100L) /
				    (di->full_active_uAh - di->empty_uAh);

	if (di->rem_capacity < 0)
		di->rem_capacity = 0;
	if (di->rem_capacity > 100)
		di->rem_capacity = 100;

	if (di->current_uA < -100L)
		di->life_sec = -((di->accum_current_uAh - di->empty_uAh) * 36L)
					/ (di->current_uA / 100L);
	else
		di->life_sec = 0;

	return 0;
}

static void ds2760_battery_set_current_accum(struct ds2760_device_info *di,
					     unsigned int acr_val)
{
	unsigned char acr[2];

	/* acr is in units of 0.25 mAh */
	acr_val *= 4L;
	acr_val /= 1000;

	acr[0] = acr_val >> 8;
	acr[1] = acr_val & 0xff;

	if (w1_ds2760_write(di->w1_dev, acr, DS2760_CURRENT_ACCUM_MSB, 2) < 2)
		dev_warn(di->dev, "ACR write failed\n");
}

static void ds2760_battery_update_status(struct ds2760_device_info *di)
{
	int old_charge_status = di->charge_status;

	ds2760_battery_read_status(di);

	if (di->charge_status == POWER_SUPPLY_STATUS_UNKNOWN)
		di->full_counter = 0;

	if (power_supply_am_i_supplied(&di->bat)) {
		if (di->current_uA > 10000) {
			di->charge_status = POWER_SUPPLY_STATUS_CHARGING;
			di->full_counter = 0;
		} else if (di->current_uA < -5000) {
			if (di->charge_status != POWER_SUPPLY_STATUS_NOT_CHARGING)
				dev_notice(di->dev, "not enough power to "
					   "charge\n");
			di->charge_status = POWER_SUPPLY_STATUS_NOT_CHARGING;
			di->full_counter = 0;
		} else if (di->current_uA < 10000 &&
			    di->charge_status != POWER_SUPPLY_STATUS_FULL) {

			/* Don't consider the battery to be full unless
			 * we've seen the current < 10 mA at least two
			 * consecutive times. */

			di->full_counter++;

			if (di->full_counter < 2) {
				di->charge_status = POWER_SUPPLY_STATUS_CHARGING;
			} else {
				di->charge_status = POWER_SUPPLY_STATUS_FULL;
				ds2760_battery_set_current_accum(di,
						di->full_active_uAh);
			}
		}
	} else {
		di->charge_status = POWER_SUPPLY_STATUS_DISCHARGING;
		di->full_counter = 0;
	}

	if (di->charge_status != old_charge_status)
		power_supply_changed(&di->bat);
}

static void ds2760_battery_write_status(struct ds2760_device_info *di,
					char status)
{
	if (status == di->raw[DS2760_STATUS_REG])
		return;

	w1_ds2760_write(di->w1_dev, &status, DS2760_STATUS_WRITE_REG, 1);
	w1_ds2760_store_eeprom(di->w1_dev, DS2760_EEPROM_BLOCK1);
	w1_ds2760_recall_eeprom(di->w1_dev, DS2760_EEPROM_BLOCK1);
}

static void ds2760_battery_write_rated_capacity(struct ds2760_device_info *di,
						unsigned char rated_capacity)
{
	if (rated_capacity == di->raw[DS2760_RATED_CAPACITY])
		return;

	w1_ds2760_write(di->w1_dev, &rated_capacity, DS2760_RATED_CAPACITY, 1);
	w1_ds2760_store_eeprom(di->w1_dev, DS2760_EEPROM_BLOCK1);
	w1_ds2760_recall_eeprom(di->w1_dev, DS2760_EEPROM_BLOCK1);
}

static void ds2760_battery_write_active_full(struct ds2760_device_info *di,
					     int active_full)
{
	unsigned char tmp[2] = {
		active_full >> 8,
		active_full & 0xff
	};

	if (tmp[0] == di->raw[DS2760_ACTIVE_FULL] &&
	    tmp[1] == di->raw[DS2760_ACTIVE_FULL + 1])
		return;

	w1_ds2760_write(di->w1_dev, tmp, DS2760_ACTIVE_FULL, sizeof(tmp));
	w1_ds2760_store_eeprom(di->w1_dev, DS2760_EEPROM_BLOCK0);
	w1_ds2760_recall_eeprom(di->w1_dev, DS2760_EEPROM_BLOCK0);

	/* Write to the di->raw[] buffer directly - the DS2760_ACTIVE_FULL
	 * values won't be read back by ds2760_battery_read_status() */
	di->raw[DS2760_ACTIVE_FULL] = tmp[0];
	di->raw[DS2760_ACTIVE_FULL + 1] = tmp[1];
}

static void ds2760_battery_work(struct work_struct *work)
{
	struct ds2760_device_info *di = container_of(work,
		struct ds2760_device_info, monitor_work.work);
	const int interval = HZ * 60;

	dev_dbg(di->dev, "%s\n", __func__);

	ds2760_battery_update_status(di);
	queue_delayed_work(di->monitor_wqueue, &di->monitor_work, interval);
}

#define to_ds2760_device_info(x) container_of((x), struct ds2760_device_info, \
					      bat);

static void ds2760_battery_external_power_changed(struct power_supply *psy)
{
	struct ds2760_device_info *di = to_ds2760_device_info(psy);

	dev_dbg(di->dev, "%s\n", __func__);

	cancel_delayed_work(&di->monitor_work);
	queue_delayed_work(di->monitor_wqueue, &di->monitor_work, HZ/10);
}


static void ds2760_battery_set_charged_work(struct work_struct *work)
{
	char bias;
	struct ds2760_device_info *di = container_of(work,
		struct ds2760_device_info, set_charged_work.work);

	dev_dbg(di->dev, "%s\n", __func__);

	ds2760_battery_read_status(di);

	/* When we get notified by external circuitry that the battery is
	 * considered fully charged now, we know that there is no current
	 * flow any more. However, the ds2760's internal current meter is
	 * too inaccurate to rely on - spec say something ~15% failure.
	 * Hence, we use the current offset bias register to compensate
	 * that error.
	 */

	if (!power_supply_am_i_supplied(&di->bat))
		return;

	bias = (signed char) di->current_raw +
		(signed char) di->raw[DS2760_CURRENT_OFFSET_BIAS];

	dev_dbg(di->dev, "%s: bias = %d\n", __func__, bias);

	w1_ds2760_write(di->w1_dev, &bias, DS2760_CURRENT_OFFSET_BIAS, 1);
	w1_ds2760_store_eeprom(di->w1_dev, DS2760_EEPROM_BLOCK1);
	w1_ds2760_recall_eeprom(di->w1_dev, DS2760_EEPROM_BLOCK1);

	/* Write to the di->raw[] buffer directly - the CURRENT_OFFSET_BIAS
	 * value won't be read back by ds2760_battery_read_status() */
	di->raw[DS2760_CURRENT_OFFSET_BIAS] = bias;
}

static void ds2760_battery_set_charged(struct power_supply *psy)
{
	struct ds2760_device_info *di = to_ds2760_device_info(psy);

	/* postpone the actual work by 20 secs. This is for debouncing GPIO
	 * signals and to let the current value settle. See AN4188. */
	cancel_delayed_work(&di->set_charged_work);
	queue_delayed_work(di->monitor_wqueue, &di->set_charged_work, HZ * 20);
}

static int ds2760_battery_get_property(struct power_supply *psy,
				       enum power_supply_property psp,
				       union power_supply_propval *val)
{
	struct ds2760_device_info *di = to_ds2760_device_info(psy);

	switch (psp) {
	case POWER_SUPPLY_PROP_STATUS:
		val->intval = di->charge_status;
		return 0;
	default:
		break;
	}

	ds2760_battery_read_status(di);

	switch (psp) {
	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
		val->intval = di->voltage_uV;
		break;
	case POWER_SUPPLY_PROP_CURRENT_NOW:
		val->intval = di->current_uA;
		break;
	case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
		val->intval = di->rated_capacity;
		break;
	case POWER_SUPPLY_PROP_CHARGE_FULL:
		val->intval = di->full_active_uAh;
		break;
	case POWER_SUPPLY_PROP_CHARGE_EMPTY:
		val->intval = di->empty_uAh;
		break;
	case POWER_SUPPLY_PROP_CHARGE_NOW:
		val->intval = di->accum_current_uAh;
		break;
	case POWER_SUPPLY_PROP_TEMP:
		val->intval = di->temp_C;
		break;
	case POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW:
		val->intval = di->life_sec;
		break;
	case POWER_SUPPLY_PROP_CAPACITY:
		val->intval = di->rem_capacity;
		break;
	default:
		return -EINVAL;
	}

	return 0;
}

static int ds2760_battery_set_property(struct power_supply *psy,
				       enum power_supply_property psp,
				       const union power_supply_propval *val)
{
	struct ds2760_device_info *di = to_ds2760_device_info(psy);

	switch (psp) {
	case POWER_SUPPLY_PROP_CHARGE_FULL:
		/* the interface counts in uAh, convert the value */
		ds2760_battery_write_active_full(di, val->intval / 1000L);
		break;

	case POWER_SUPPLY_PROP_CHARGE_NOW:
		/* ds2760_battery_set_current_accum() does the conversion */
		ds2760_battery_set_current_accum(di, val->intval);
		break;

	default:
		return -EPERM;
	}

	return 0;
}

static int ds2760_battery_property_is_writeable(struct power_supply *psy,
						enum power_supply_property psp)
{
	switch (psp) {
	case POWER_SUPPLY_PROP_CHARGE_FULL:
	case POWER_SUPPLY_PROP_CHARGE_NOW:
		return 1;

	default:
		break;
	}

	return 0;
}

static enum power_supply_property ds2760_battery_props[] = {
	POWER_SUPPLY_PROP_STATUS,
	POWER_SUPPLY_PROP_VOLTAGE_NOW,
	POWER_SUPPLY_PROP_CURRENT_NOW,
	POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
	POWER_SUPPLY_PROP_CHARGE_FULL,
	POWER_SUPPLY_PROP_CHARGE_EMPTY,
	POWER_SUPPLY_PROP_CHARGE_NOW,
	POWER_SUPPLY_PROP_TEMP,
	POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
	POWER_SUPPLY_PROP_CAPACITY,
};

static int ds2760_battery_probe(struct platform_device *pdev)
{
	char status;
	int retval = 0;
	struct ds2760_device_info *di;

	di = kzalloc(sizeof(*di), GFP_KERNEL);
	if (!di) {
		retval = -ENOMEM;
		goto di_alloc_failed;
	}

	platform_set_drvdata(pdev, di);

	di->dev			= &pdev->dev;
	di->w1_dev		= pdev->dev.parent;
	di->bat.name		= dev_name(&pdev->dev);
	di->bat.type		= POWER_SUPPLY_TYPE_BATTERY;
	di->bat.properties	= ds2760_battery_props;
	di->bat.num_properties	= ARRAY_SIZE(ds2760_battery_props);
	di->bat.get_property	= ds2760_battery_get_property;
	di->bat.set_property	= ds2760_battery_set_property;
	di->bat.property_is_writeable =
				  ds2760_battery_property_is_writeable;
	di->bat.set_charged	= ds2760_battery_set_charged;
	di->bat.external_power_changed =
				  ds2760_battery_external_power_changed;

	di->charge_status = POWER_SUPPLY_STATUS_UNKNOWN;

	/* enable sleep mode feature */
	ds2760_battery_read_status(di);
	status = di->raw[DS2760_STATUS_REG];
	if (pmod_enabled)
		status |= DS2760_STATUS_PMOD;
	else
		status &= ~DS2760_STATUS_PMOD;

	ds2760_battery_write_status(di, status);

	/* set rated capacity from module param */
	if (rated_capacity)
		ds2760_battery_write_rated_capacity(di, rated_capacity);

	/* set current accumulator if given as parameter.
	 * this should only be done for bootstrapping the value */
	if (current_accum)
		ds2760_battery_set_current_accum(di, current_accum);

	retval = power_supply_register(&pdev->dev, &di->bat);
	if (retval) {
		dev_err(di->dev, "failed to register battery\n");
		goto batt_failed;
	}

	INIT_DELAYED_WORK(&di->monitor_work, ds2760_battery_work);
	INIT_DELAYED_WORK(&di->set_charged_work,
			  ds2760_battery_set_charged_work);
	di->monitor_wqueue = create_singlethread_workqueue(dev_name(&pdev->dev));
	if (!di->monitor_wqueue) {
		retval = -ESRCH;
		goto workqueue_failed;
	}
	queue_delayed_work(di->monitor_wqueue, &di->monitor_work, HZ * 1);

	goto success;

workqueue_failed:
	power_supply_unregister(&di->bat);
batt_failed:
	kfree(di);
di_alloc_failed:
success:
	return retval;
}

static int ds2760_battery_remove(struct platform_device *pdev)
{
	struct ds2760_device_info *di = platform_get_drvdata(pdev);

	cancel_delayed_work_sync(&di->monitor_work);
	cancel_delayed_work_sync(&di->set_charged_work);
	destroy_workqueue(di->monitor_wqueue);
	power_supply_unregister(&di->bat);
	kfree(di);

	return 0;
}

#ifdef CONFIG_PM

static int ds2760_battery_suspend(struct platform_device *pdev,
				  pm_message_t state)
{
	struct ds2760_device_info *di = platform_get_drvdata(pdev);

	di->charge_status = POWER_SUPPLY_STATUS_UNKNOWN;

	return 0;
}

static int ds2760_battery_resume(struct platform_device *pdev)
{
	struct ds2760_device_info *di = platform_get_drvdata(pdev);

	di->charge_status = POWER_SUPPLY_STATUS_UNKNOWN;
	power_supply_changed(&di->bat);

	cancel_delayed_work(&di->monitor_work);
	queue_delayed_work(di->monitor_wqueue, &di->monitor_work, HZ);

	return 0;
}

#else

#define ds2760_battery_suspend NULL
#define ds2760_battery_resume NULL

#endif /* CONFIG_PM */

MODULE_ALIAS("platform:ds2760-battery");

static struct platform_driver ds2760_battery_driver = {
	.driver = {
		.name = "ds2760-battery",
	},
	.probe	  = ds2760_battery_probe,
	.remove   = ds2760_battery_remove,
	.suspend  = ds2760_battery_suspend,
	.resume	  = ds2760_battery_resume,
};

static int __init ds2760_battery_init(void)
{
	return platform_driver_register(&ds2760_battery_driver);
}

static void __exit ds2760_battery_exit(void)
{
	platform_driver_unregister(&ds2760_battery_driver);
}

module_init(ds2760_battery_init);
module_exit(ds2760_battery_exit);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Szabolcs Gyurko <szabolcs.gyurko@tlt.hu>, "
	      "Matt Reimer <mreimer@vpop.net>, "
	      "Anton Vorontsov <cbou@mail.ru>");
MODULE_DESCRIPTION("ds2760 battery driver");
Commit	Line	Data
fe0e3153 AV	1	/*
	2	* Driver for batteries with DS2760 chips inside.
	3	*
	4	* Copyright © 2007 Anton Vorontsov
	5	* 2004-2007 Matt Reimer
	6	* 2004 Szabolcs Gyurko
	7	*
	8	* Use consistent with the GNU GPL is permitted,
	9	* provided that this copyright notice is
	10	* preserved in its entirety in all copies and derived works.
	11	*
	12	* Author: Anton Vorontsov <cbou@mail.ru>
	13	* February 2007
	14	*
	15	* Matt Reimer <mreimer@vpop.net>
	16	* April 2004, 2005, 2007
	17	*
	18	* Szabolcs Gyurko <szabolcs.gyurko@tlt.hu>
	19	* September 2004
	20	*/
	21
	22	#include <linux/module.h>
	23	#include <linux/param.h>
	24	#include <linux/jiffies.h>
	25	#include <linux/workqueue.h>
	26	#include <linux/pm.h>
5a0e3ad6	27	#include <linux/slab.h>
fe0e3153 AV	28	#include <linux/platform_device.h>
	29	#include <linux/power_supply.h>
	30
	31	#include "../w1/w1.h"
	32	#include "../w1/slaves/w1_ds2760.h"
	33
	34	struct ds2760_device_info {
	35	struct device *dev;
	36
	37	/* DS2760 data, valid after calling ds2760_battery_read_status() */
	38	unsigned long update_time; /* jiffies when data read */
	39	char raw[DS2760_DATA_SIZE]; /* raw DS2760 data */
	40	int voltage_raw; /* units of 4.88 mV */
	41	int voltage_uV; /* units of µV */
	42	int current_raw; /* units of 0.625 mA */
	43	int current_uA; /* units of µA */
	44	int accum_current_raw; /* units of 0.25 mAh */
	45	int accum_current_uAh; /* units of µAh */
	46	int temp_raw; /* units of 0.125 °C */
	47	int temp_C; /* units of 0.1 °C */
	48	int rated_capacity; /* units of µAh */
	49	int rem_capacity; /* percentage */
	50	int full_active_uAh; /* units of µAh */
	51	int empty_uAh; /* units of µAh */
	52	int life_sec; /* units of seconds */
	53	int charge_status; /* POWER_SUPPLY_STATUS_* */
	54
	55	int full_counter;
	56	struct power_supply bat;
	57	struct device *w1_dev;
	58	struct workqueue_struct *monitor_wqueue;
	59	struct delayed_work monitor_work;
8d631ccf	60	struct delayed_work set_charged_work;
fe0e3153 AV	61	};
	62
	63	static unsigned int cache_time = 1000;
	64	module_param(cache_time, uint, 0644);
	65	MODULE_PARM_DESC(cache_time, "cache time in milliseconds");
	66
cef437e3 DM	67	static unsigned int pmod_enabled;
	68	module_param(pmod_enabled, bool, 0644);
	69	MODULE_PARM_DESC(pmod_enabled, "PMOD enable bit");
	70
c1e72193 DM	71	static unsigned int rated_capacity;
	72	module_param(rated_capacity, uint, 0644);
	73	MODULE_PARM_DESC(rated_capacity, "rated battery capacity, 10*mAh or index");
	74
02d0d275 DM	75	static unsigned int current_accum;
	76	module_param(current_accum, uint, 0644);
	77	MODULE_PARM_DESC(current_accum, "current accumulator value");
	78
fe0e3153 AV	79	/* Some batteries have their rated capacity stored a N * 10 mAh, while
	80	* others use an index into this table. */
	81	static int rated_capacities[] = {
	82	0,
	83	920, /* Samsung */
	84	920, /* BYD */
	85	920, /* Lishen */
	86	920, /* NEC */
	87	1440, /* Samsung */
	88	1440, /* BYD */
9c6f8740 PP	89	#ifdef CONFIG_MACH_H4700
	90	1800, /* HP iPAQ hx4700 3.7V 1800mAh (359113-001) */
	91	#else
fe0e3153	92	1440, /* Lishen */
9c6f8740	93	#endif
fe0e3153 AV	94	1440, /* NEC */
	95	2880, /* Samsung */
	96	2880, /* BYD */
	97	2880, /* Lishen */
	98	2880 /* NEC */
	99	};
	100
	101	/* array is level at temps 0°C, 10°C, 20°C, 30°C, 40°C
	102	* temp is in Celsius */
	103	static int battery_interpolate(int array[], int temp)
	104	{
	105	int index, dt;
	106
	107	if (temp <= 0)
	108	return array[0];
	109	if (temp >= 40)
	110	return array[4];
	111
	112	index = temp / 10;
	113	dt = temp % 10;
	114
	115	return array[index] + (((array[index + 1] - array[index]) * dt) / 10);
	116	}
	117
	118	static int ds2760_battery_read_status(struct ds2760_device_info *di)
	119	{
	120	int ret, i, start, count, scale[5];
	121
	122	if (di->update_time && time_before(jiffies, di->update_time +
	123	msecs_to_jiffies(cache_time)))
	124	return 0;
	125
	126	/* The first time we read the entire contents of SRAM/EEPROM,
	127	* but after that we just read the interesting bits that change. */
	128	if (di->update_time == 0) {
	129	start = 0;
	130	count = DS2760_DATA_SIZE;
	131	} else {
	132	start = DS2760_VOLTAGE_MSB;
	133	count = DS2760_TEMP_LSB - start + 1;
	134	}
	135
	136	ret = w1_ds2760_read(di->w1_dev, di->raw + start, start, count);
	137	if (ret != count) {
	138	dev_warn(di->dev, "call to w1_ds2760_read failed (0x%p)\n",
	139	di->w1_dev);
	140	return 1;
	141	}
	142
	143	di->update_time = jiffies;
	144
	145	/* DS2760 reports voltage in units of 4.88mV, but the battery class
	146	* reports in units of uV, so convert by multiplying by 4880. */
	147	di->voltage_raw = (di->raw[DS2760_VOLTAGE_MSB] << 3) \|
	148	(di->raw[DS2760_VOLTAGE_LSB] >> 5);
	149	di->voltage_uV = di->voltage_raw * 4880;
	150
	151	/* DS2760 reports current in signed units of 0.625mA, but the battery
	152	* class reports in units of µA, so convert by multiplying by 625. */
	153	di->current_raw =
	154	(((signed char)di->raw[DS2760_CURRENT_MSB]) << 5) \|
	155	(di->raw[DS2760_CURRENT_LSB] >> 3);
	156	di->current_uA = di->current_raw * 625;
	157
158	/* DS2760 reports accumulated current in signed units of 0.25mAh. */
159	di->accum_current_raw =
160	(((signed char)di->raw[DS2760_CURRENT_ACCUM_MSB]) << 8) \|
161	di->raw[DS2760_CURRENT_ACCUM_LSB];
162	di->accum_current_uAh = di->accum_current_raw * 250;
163
164	/* DS2760 reports temperature in signed units of 0.125°C, but the
165	* battery class reports in units of 1/10 °C, so we convert by
166	* multiplying by .125 * 10 = 1.25. */
167	di->temp_raw = (((signed char)di->raw[DS2760_TEMP_MSB]) << 3) \|
168	(di->raw[DS2760_TEMP_LSB] >> 5);
169	di->temp_C = di->temp_raw + (di->temp_raw / 4);
170
171	/* At least some battery monitors (e.g. HP iPAQ) store the battery's
172	* maximum rated capacity. */
173	if (di->raw[DS2760_RATED_CAPACITY] < ARRAY_SIZE(rated_capacities))
174	di->rated_capacity = rated_capacities[
175	(unsigned int)di->raw[DS2760_RATED_CAPACITY]];
176	else
177	di->rated_capacity = di->raw[DS2760_RATED_CAPACITY] * 10;
178
179	di->rated_capacity = 1000; / convert to µAh */
180
181	/* Calculate the full level at the present temperature. */
182	di->full_active_uAh = di->raw[DS2760_ACTIVE_FULL] << 8 \|
183	di->raw[DS2760_ACTIVE_FULL + 1];
184
25f2bfa6 DM	185	/* If the full_active_uAh value is not given, fall back to the rated
	186	* capacity. This is likely to happen when chips are not part of the
	187	* battery pack and is therefore not bootstrapped. */
	188	if (di->full_active_uAh == 0)
	189	di->full_active_uAh = di->rated_capacity / 1000L;
	190
	191	scale[0] = di->full_active_uAh;
fe0e3153	192	for (i = 1; i < 5; i++)
3af98a8f	193	scale[i] = scale[i - 1] + di->raw[DS2760_ACTIVE_FULL + 1 + i];
fe0e3153 AV	194
	195	di->full_active_uAh = battery_interpolate(scale, di->temp_C / 10);
	196	di->full_active_uAh = 1000; / convert to µAh */
	197
	198	/* Calculate the empty level at the present temperature. */
	199	scale[4] = di->raw[DS2760_ACTIVE_EMPTY + 4];
	200	for (i = 3; i >= 0; i--)
	201	scale[i] = scale[i + 1] + di->raw[DS2760_ACTIVE_EMPTY + i];
	202
	203	di->empty_uAh = battery_interpolate(scale, di->temp_C / 10);
	204	di->empty_uAh = 1000; / convert to µAh */
	205
a4e3f91b DM	206	if (di->full_active_uAh == di->empty_uAh)
	207	di->rem_capacity = 0;
	208	else
	209	/* From Maxim Application Note 131: remaining capacity =
	210	* ((ICA - Empty Value) / (Full Value - Empty Value)) x 100% */
	211	di->rem_capacity = ((di->accum_current_uAh - di->empty_uAh) * 100L) /
	212	(di->full_active_uAh - di->empty_uAh);
fe0e3153 AV	213
	214	if (di->rem_capacity < 0)
	215	di->rem_capacity = 0;
	216	if (di->rem_capacity > 100)
	217	di->rem_capacity = 100;
	218
86af9503	219	if (di->current_uA < -100L)
b0525b48 DM	220	di->life_sec = -((di->accum_current_uAh - di->empty_uAh) * 36L)
b0525b48 DM	221	/ (di->current_uA / 100L);
fe0e3153 AV	222	else
	223	di->life_sec = 0;
	224
	225	return 0;
	226	}
	227
02d0d275 DM	228	static void ds2760_battery_set_current_accum(struct ds2760_device_info *di,
	229	unsigned int acr_val)
	230	{
	231	unsigned char acr[2];
	232
	233	/* acr is in units of 0.25 mAh */
	234	acr_val *= 4L;
	235	acr_val /= 1000;
	236
	237	acr[0] = acr_val >> 8;
	238	acr[1] = acr_val & 0xff;
	239
	240	if (w1_ds2760_write(di->w1_dev, acr, DS2760_CURRENT_ACCUM_MSB, 2) < 2)
	241	dev_warn(di->dev, "ACR write failed\n");
	242	}
	243
fe0e3153 AV	244	static void ds2760_battery_update_status(struct ds2760_device_info *di)
	245	{
	246	int old_charge_status = di->charge_status;
	247
	248	ds2760_battery_read_status(di);
	249
	250	if (di->charge_status == POWER_SUPPLY_STATUS_UNKNOWN)
	251	di->full_counter = 0;
	252
	253	if (power_supply_am_i_supplied(&di->bat)) {
	254	if (di->current_uA > 10000) {
	255	di->charge_status = POWER_SUPPLY_STATUS_CHARGING;
	256	di->full_counter = 0;
	257	} else if (di->current_uA < -5000) {
	258	if (di->charge_status != POWER_SUPPLY_STATUS_NOT_CHARGING)
	259	dev_notice(di->dev, "not enough power to "
	260	"charge\n");
	261	di->charge_status = POWER_SUPPLY_STATUS_NOT_CHARGING;
	262	di->full_counter = 0;
	263	} else if (di->current_uA < 10000 &&
	264	di->charge_status != POWER_SUPPLY_STATUS_FULL) {
	265
	266	/* Don't consider the battery to be full unless
	267	* we've seen the current < 10 mA at least two
	268	* consecutive times. */
	269
	270	di->full_counter++;
	271
	272	if (di->full_counter < 2) {
	273	di->charge_status = POWER_SUPPLY_STATUS_CHARGING;
	274	} else {
fe0e3153	275	di->charge_status = POWER_SUPPLY_STATUS_FULL;
02d0d275 DM	276	ds2760_battery_set_current_accum(di,
02d0d275 DM	277	di->full_active_uAh);
fe0e3153 AV	278	}
	279	}
	280	} else {
	281	di->charge_status = POWER_SUPPLY_STATUS_DISCHARGING;
	282	di->full_counter = 0;
	283	}
	284
	285	if (di->charge_status != old_charge_status)
	286	power_supply_changed(&di->bat);
fe0e3153 AV	287	}
fe0e3153 AV	288
cef437e3 DM	289	static void ds2760_battery_write_status(struct ds2760_device_info *di,
	290	char status)
	291	{
	292	if (status == di->raw[DS2760_STATUS_REG])
	293	return;
	294
	295	w1_ds2760_write(di->w1_dev, &status, DS2760_STATUS_WRITE_REG, 1);
	296	w1_ds2760_store_eeprom(di->w1_dev, DS2760_EEPROM_BLOCK1);
	297	w1_ds2760_recall_eeprom(di->w1_dev, DS2760_EEPROM_BLOCK1);
	298	}
	299
c1e72193 DM	300	static void ds2760_battery_write_rated_capacity(struct ds2760_device_info *di,
	301	unsigned char rated_capacity)
	302	{
	303	if (rated_capacity == di->raw[DS2760_RATED_CAPACITY])
	304	return;
	305
	306	w1_ds2760_write(di->w1_dev, &rated_capacity, DS2760_RATED_CAPACITY, 1);
	307	w1_ds2760_store_eeprom(di->w1_dev, DS2760_EEPROM_BLOCK1);
	308	w1_ds2760_recall_eeprom(di->w1_dev, DS2760_EEPROM_BLOCK1);
	309	}
	310
bd52ca55 DM	311	static void ds2760_battery_write_active_full(struct ds2760_device_info *di,
	312	int active_full)
	313	{
	314	unsigned char tmp[2] = {
	315	active_full >> 8,
	316	active_full & 0xff
	317	};
	318
	319	if (tmp[0] == di->raw[DS2760_ACTIVE_FULL] &&
	320	tmp[1] == di->raw[DS2760_ACTIVE_FULL + 1])
	321	return;
	322
	323	w1_ds2760_write(di->w1_dev, tmp, DS2760_ACTIVE_FULL, sizeof(tmp));
	324	w1_ds2760_store_eeprom(di->w1_dev, DS2760_EEPROM_BLOCK0);
	325	w1_ds2760_recall_eeprom(di->w1_dev, DS2760_EEPROM_BLOCK0);
	326
	327	/* Write to the di->raw[] buffer directly - the DS2760_ACTIVE_FULL
	328	* values won't be read back by ds2760_battery_read_status() */
	329	di->raw[DS2760_ACTIVE_FULL] = tmp[0];
	330	di->raw[DS2760_ACTIVE_FULL + 1] = tmp[1];
	331	}
	332
fe0e3153 AV	333	static void ds2760_battery_work(struct work_struct *work)
	334	{
	335	struct ds2760_device_info *di = container_of(work,
	336	struct ds2760_device_info, monitor_work.work);
	337	const int interval = HZ * 60;
	338
0cddc0a9	339	dev_dbg(di->dev, "%s\n", __func__);
fe0e3153 AV	340
	341	ds2760_battery_update_status(di);
	342	queue_delayed_work(di->monitor_wqueue, &di->monitor_work, interval);
fe0e3153 AV	343	}
	344
	345	#define to_ds2760_device_info(x) container_of((x), struct ds2760_device_info, \
	346	bat);
	347
	348	static void ds2760_battery_external_power_changed(struct power_supply *psy)
	349	{
	350	struct ds2760_device_info *di = to_ds2760_device_info(psy);
	351
0cddc0a9	352	dev_dbg(di->dev, "%s\n", __func__);
fe0e3153 AV	353
	354	cancel_delayed_work(&di->monitor_work);
	355	queue_delayed_work(di->monitor_wqueue, &di->monitor_work, HZ/10);
fe0e3153 AV	356	}
fe0e3153 AV	357
8d631ccf DM	358
	359	static void ds2760_battery_set_charged_work(struct work_struct *work)
	360	{
	361	char bias;
	362	struct ds2760_device_info *di = container_of(work,
	363	struct ds2760_device_info, set_charged_work.work);
	364
	365	dev_dbg(di->dev, "%s\n", __func__);
	366
	367	ds2760_battery_read_status(di);
	368
	369	/* When we get notified by external circuitry that the battery is
	370	* considered fully charged now, we know that there is no current
	371	* flow any more. However, the ds2760's internal current meter is
	372	* too inaccurate to rely on - spec say something ~15% failure.
	373	* Hence, we use the current offset bias register to compensate
	374	* that error.
	375	*/
	376
	377	if (!power_supply_am_i_supplied(&di->bat))
	378	return;
	379
	380	bias = (signed char) di->current_raw +
	381	(signed char) di->raw[DS2760_CURRENT_OFFSET_BIAS];
	382
	383	dev_dbg(di->dev, "%s: bias = %d\n", __func__, bias);
	384
	385	w1_ds2760_write(di->w1_dev, &bias, DS2760_CURRENT_OFFSET_BIAS, 1);
	386	w1_ds2760_store_eeprom(di->w1_dev, DS2760_EEPROM_BLOCK1);
	387	w1_ds2760_recall_eeprom(di->w1_dev, DS2760_EEPROM_BLOCK1);
	388
	389	/* Write to the di->raw[] buffer directly - the CURRENT_OFFSET_BIAS
	390	* value won't be read back by ds2760_battery_read_status() */
	391	di->raw[DS2760_CURRENT_OFFSET_BIAS] = bias;
	392	}
	393
	394	static void ds2760_battery_set_charged(struct power_supply *psy)
	395	{
	396	struct ds2760_device_info *di = to_ds2760_device_info(psy);
	397
	398	/* postpone the actual work by 20 secs. This is for debouncing GPIO
	399	* signals and to let the current value settle. See AN4188. */
	400	cancel_delayed_work(&di->set_charged_work);
	401	queue_delayed_work(di->monitor_wqueue, &di->set_charged_work, HZ * 20);
	402	}
	403
fe0e3153 AV	404	static int ds2760_battery_get_property(struct power_supply *psy,
	405	enum power_supply_property psp,
	406	union power_supply_propval *val)
	407	{
	408	struct ds2760_device_info *di = to_ds2760_device_info(psy);
	409
	410	switch (psp) {
	411	case POWER_SUPPLY_PROP_STATUS:
	412	val->intval = di->charge_status;
	413	return 0;
	414	default:
	415	break;
	416	}
	417
	418	ds2760_battery_read_status(di);
	419
	420	switch (psp) {
	421	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
	422	val->intval = di->voltage_uV;
	423	break;
	424	case POWER_SUPPLY_PROP_CURRENT_NOW:
	425	val->intval = di->current_uA;
	426	break;
	427	case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
	428	val->intval = di->rated_capacity;
	429	break;
	430	case POWER_SUPPLY_PROP_CHARGE_FULL:
	431	val->intval = di->full_active_uAh;
	432	break;
	433	case POWER_SUPPLY_PROP_CHARGE_EMPTY:
	434	val->intval = di->empty_uAh;
	435	break;
	436	case POWER_SUPPLY_PROP_CHARGE_NOW:
	437	val->intval = di->accum_current_uAh;
	438	break;
	439	case POWER_SUPPLY_PROP_TEMP:
	440	val->intval = di->temp_C;
	441	break;
5c6e9bf2 DM	442	case POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW:
	443	val->intval = di->life_sec;
	444	break;
	445	case POWER_SUPPLY_PROP_CAPACITY:
	446	val->intval = di->rem_capacity;
	447	break;
fe0e3153 AV	448	default:
	449	return -EINVAL;
	450	}
	451
	452	return 0;
	453	}
	454
bd52ca55 DM	455	static int ds2760_battery_set_property(struct power_supply *psy,
	456	enum power_supply_property psp,
	457	const union power_supply_propval *val)
	458	{
	459	struct ds2760_device_info *di = to_ds2760_device_info(psy);
	460
	461	switch (psp) {
	462	case POWER_SUPPLY_PROP_CHARGE_FULL:
	463	/* the interface counts in uAh, convert the value */
	464	ds2760_battery_write_active_full(di, val->intval / 1000L);
	465	break;
	466
	467	case POWER_SUPPLY_PROP_CHARGE_NOW:
	468	/* ds2760_battery_set_current_accum() does the conversion */
	469	ds2760_battery_set_current_accum(di, val->intval);
	470	break;
	471
	472	default:
	473	return -EPERM;
	474	}
	475
	476	return 0;
	477	}
	478
	479	static int ds2760_battery_property_is_writeable(struct power_supply *psy,
	480	enum power_supply_property psp)
	481	{
	482	switch (psp) {
	483	case POWER_SUPPLY_PROP_CHARGE_FULL:
	484	case POWER_SUPPLY_PROP_CHARGE_NOW:
	485	return 1;
	486
	487	default:
	488	break;
	489	}
	490
	491	return 0;
	492	}
	493
fe0e3153 AV	494	static enum power_supply_property ds2760_battery_props[] = {
	495	POWER_SUPPLY_PROP_STATUS,
	496	POWER_SUPPLY_PROP_VOLTAGE_NOW,
	497	POWER_SUPPLY_PROP_CURRENT_NOW,
	498	POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
	499	POWER_SUPPLY_PROP_CHARGE_FULL,
	500	POWER_SUPPLY_PROP_CHARGE_EMPTY,
	501	POWER_SUPPLY_PROP_CHARGE_NOW,
	502	POWER_SUPPLY_PROP_TEMP,
5c6e9bf2 DM	503	POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
5c6e9bf2 DM	504	POWER_SUPPLY_PROP_CAPACITY,
fe0e3153 AV	505	};
	506
	507	static int ds2760_battery_probe(struct platform_device *pdev)
	508	{
cef437e3	509	char status;
fe0e3153 AV	510	int retval = 0;
fe0e3153 AV	511	struct ds2760_device_info *di;
fe0e3153 AV	512
	513	di = kzalloc(sizeof(*di), GFP_KERNEL);
	514	if (!di) {
	515	retval = -ENOMEM;
	516	goto di_alloc_failed;
	517	}
	518
	519	platform_set_drvdata(pdev, di);
	520
ae9fb6e8 DM	521	di->dev = &pdev->dev;
	522	di->w1_dev = pdev->dev.parent;
	523	di->bat.name = dev_name(&pdev->dev);
	524	di->bat.type = POWER_SUPPLY_TYPE_BATTERY;
	525	di->bat.properties = ds2760_battery_props;
	526	di->bat.num_properties = ARRAY_SIZE(ds2760_battery_props);
	527	di->bat.get_property = ds2760_battery_get_property;
bd52ca55 DM	528	di->bat.set_property = ds2760_battery_set_property;
	529	di->bat.property_is_writeable =
	530	ds2760_battery_property_is_writeable;
8d631ccf	531	di->bat.set_charged = ds2760_battery_set_charged;
fe0e3153 AV	532	di->bat.external_power_changed =
	533	ds2760_battery_external_power_changed;
	534
	535	di->charge_status = POWER_SUPPLY_STATUS_UNKNOWN;
	536
cef437e3 DM	537	/* enable sleep mode feature */
	538	ds2760_battery_read_status(di);
	539	status = di->raw[DS2760_STATUS_REG];
	540	if (pmod_enabled)
	541	status \|= DS2760_STATUS_PMOD;
	542	else
	543	status &= ~DS2760_STATUS_PMOD;
	544
	545	ds2760_battery_write_status(di, status);
	546
c1e72193 DM	547	/* set rated capacity from module param */
	548	if (rated_capacity)
	549	ds2760_battery_write_rated_capacity(di, rated_capacity);
	550
02d0d275 DM	551	/* set current accumulator if given as parameter.
	552	* this should only be done for bootstrapping the value */
	553	if (current_accum)
	554	ds2760_battery_set_current_accum(di, current_accum);
	555
2e83a5c5 DM	556	retval = power_supply_register(&pdev->dev, &di->bat);
	557	if (retval) {
	558	dev_err(di->dev, "failed to register battery\n");
	559	goto batt_failed;
	560	}
	561
fe0e3153	562	INIT_DELAYED_WORK(&di->monitor_work, ds2760_battery_work);
8d631ccf DM	563	INIT_DELAYED_WORK(&di->set_charged_work,
8d631ccf DM	564	ds2760_battery_set_charged_work);
ba88b002	565	di->monitor_wqueue = create_singlethread_workqueue(dev_name(&pdev->dev));
fe0e3153 AV	566	if (!di->monitor_wqueue) {
	567	retval = -ESRCH;
	568	goto workqueue_failed;
	569	}
	570	queue_delayed_work(di->monitor_wqueue, &di->monitor_work, HZ * 1);
	571
	572	goto success;
	573
	574	workqueue_failed:
	575	power_supply_unregister(&di->bat);
	576	batt_failed:
	577	kfree(di);
	578	di_alloc_failed:
	579	success:
	580	return retval;
	581	}
	582
	583	static int ds2760_battery_remove(struct platform_device *pdev)
	584	{
	585	struct ds2760_device_info *di = platform_get_drvdata(pdev);
	586
afe2c511 TH	587	cancel_delayed_work_sync(&di->monitor_work);
afe2c511 TH	588	cancel_delayed_work_sync(&di->set_charged_work);
fe0e3153 AV	589	destroy_workqueue(di->monitor_wqueue);
fe0e3153 AV	590	power_supply_unregister(&di->bat);
a01bce6a	591	kfree(di);
fe0e3153 AV	592
	593	return 0;
	594	}
	595
	596	#ifdef CONFIG_PM
	597
	598	static int ds2760_battery_suspend(struct platform_device *pdev,
	599	pm_message_t state)
	600	{
	601	struct ds2760_device_info *di = platform_get_drvdata(pdev);
	602
	603	di->charge_status = POWER_SUPPLY_STATUS_UNKNOWN;
	604
	605	return 0;
	606	}
	607
	608	static int ds2760_battery_resume(struct platform_device *pdev)
	609	{
	610	struct ds2760_device_info *di = platform_get_drvdata(pdev);
	611
	612	di->charge_status = POWER_SUPPLY_STATUS_UNKNOWN;
	613	power_supply_changed(&di->bat);
	614
	615	cancel_delayed_work(&di->monitor_work);
	616	queue_delayed_work(di->monitor_wqueue, &di->monitor_work, HZ);
	617
	618	return 0;
	619	}
	620
	621	#else
	622
	623	#define ds2760_battery_suspend NULL
	624	#define ds2760_battery_resume NULL
	625
	626	#endif /* CONFIG_PM */
	627
2f5a5cf9 KS	628	MODULE_ALIAS("platform:ds2760-battery");
2f5a5cf9 KS	629
fe0e3153 AV	630	static struct platform_driver ds2760_battery_driver = {
	631	.driver = {
	632	.name = "ds2760-battery",
	633	},
	634	.probe = ds2760_battery_probe,
	635	.remove = ds2760_battery_remove,
	636	.suspend = ds2760_battery_suspend,
	637	.resume = ds2760_battery_resume,
	638	};
	639
	640	static int __init ds2760_battery_init(void)
	641	{
	642	return platform_driver_register(&ds2760_battery_driver);
	643	}
	644
	645	static void __exit ds2760_battery_exit(void)
	646	{
	647	platform_driver_unregister(&ds2760_battery_driver);
fe0e3153 AV	648	}
	649
	650	module_init(ds2760_battery_init);
	651	module_exit(ds2760_battery_exit);
	652
	653	MODULE_LICENSE("GPL");
	654	MODULE_AUTHOR("Szabolcs Gyurko <szabolcs.gyurko@tlt.hu>, "
	655	"Matt Reimer <mreimer@vpop.net>, "
	656	"Anton Vorontsov <cbou@mail.ru>");
	657	MODULE_DESCRIPTION("ds2760 battery driver");