Adding upstream version 4.19.249.upstream/4.19.249

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 816 insertions, 0 deletions

diff --git a/drivers/power/supply/ds2760_battery.c b/drivers/power/supply/ds2760_battery.c
new file mode 100644
index 000000000..11bed88a8
--- /dev/null
+++ b/drivers/power/supply/ds2760_battery.c
@@ -0,0 +1,816 @@
+/*
+ * 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 <linux/suspend.h>
+#include <linux/w1.h>
+#include <linux/of.h>
+
+static unsigned int cache_time = 1000;
+module_param(cache_time, uint, 0644);
+MODULE_PARM_DESC(cache_time, "cache time in milliseconds");
+
+static bool 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");
+
+#define W1_FAMILY_DS2760		0x30
+
+/* Known commands to the DS2760 chip */
+#define W1_DS2760_SWAP			0xAA
+#define W1_DS2760_READ_DATA		0x69
+#define W1_DS2760_WRITE_DATA		0x6C
+#define W1_DS2760_COPY_DATA		0x48
+#define W1_DS2760_RECALL_DATA		0xB8
+#define W1_DS2760_LOCK			0x6A
+
+/* Number of valid register addresses */
+#define DS2760_DATA_SIZE		0x40
+
+#define DS2760_PROTECTION_REG		0x00
+
+#define DS2760_STATUS_REG		0x01
+#define DS2760_STATUS_IE		(1 << 2)
+#define DS2760_STATUS_SWEN		(1 << 3)
+#define DS2760_STATUS_RNAOP		(1 << 4)
+#define DS2760_STATUS_PMOD		(1 << 5)
+
+#define DS2760_EEPROM_REG		0x07
+#define DS2760_SPECIAL_FEATURE_REG	0x08
+#define DS2760_VOLTAGE_MSB		0x0c
+#define DS2760_VOLTAGE_LSB		0x0d
+#define DS2760_CURRENT_MSB		0x0e
+#define DS2760_CURRENT_LSB		0x0f
+#define DS2760_CURRENT_ACCUM_MSB	0x10
+#define DS2760_CURRENT_ACCUM_LSB	0x11
+#define DS2760_TEMP_MSB			0x18
+#define DS2760_TEMP_LSB			0x19
+#define DS2760_EEPROM_BLOCK0		0x20
+#define DS2760_ACTIVE_FULL		0x20
+#define DS2760_EEPROM_BLOCK1		0x30
+#define DS2760_STATUS_WRITE_REG		0x31
+#define DS2760_RATED_CAPACITY		0x32
+#define DS2760_CURRENT_OFFSET_BIAS	0x33
+#define DS2760_ACTIVE_EMPTY		0x3b
+
+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 power_supply_desc bat_desc;
+	struct workqueue_struct *monitor_wqueue;
+	struct delayed_work monitor_work;
+	struct delayed_work set_charged_work;
+	struct notifier_block pm_notifier;
+};
+
+static int w1_ds2760_io(struct device *dev, char *buf, int addr, size_t count,
+			int io)
+{
+	struct w1_slave *sl = container_of(dev, struct w1_slave, dev);
+
+	if (!dev)
+		return 0;
+
+	mutex_lock(&sl->master->bus_mutex);
+
+	if (addr > DS2760_DATA_SIZE || addr < 0) {
+		count = 0;
+		goto out;
+	}
+	if (addr + count > DS2760_DATA_SIZE)
+		count = DS2760_DATA_SIZE - addr;
+
+	if (!w1_reset_select_slave(sl)) {
+		if (!io) {
+			w1_write_8(sl->master, W1_DS2760_READ_DATA);
+			w1_write_8(sl->master, addr);
+			count = w1_read_block(sl->master, buf, count);
+		} else {
+			w1_write_8(sl->master, W1_DS2760_WRITE_DATA);
+			w1_write_8(sl->master, addr);
+			w1_write_block(sl->master, buf, count);
+			/* XXX w1_write_block returns void, not n_written */
+		}
+	}
+
+out:
+	mutex_unlock(&sl->master->bus_mutex);
+
+	return count;
+}
+
+static int w1_ds2760_read(struct device *dev,
+			  char *buf, int addr,
+			  size_t count)
+{
+	return w1_ds2760_io(dev, buf, addr, count, 0);
+}
+
+static int w1_ds2760_write(struct device *dev,
+			   char *buf,
+			   int addr, size_t count)
+{
+	return w1_ds2760_io(dev, buf, addr, count, 1);
+}
+
+static int w1_ds2760_eeprom_cmd(struct device *dev, int addr, int cmd)
+{
+	struct w1_slave *sl = container_of(dev, struct w1_slave, dev);
+
+	if (!dev)
+		return -EINVAL;
+
+	mutex_lock(&sl->master->bus_mutex);
+
+	if (w1_reset_select_slave(sl) == 0) {
+		w1_write_8(sl->master, cmd);
+		w1_write_8(sl->master, addr);
+	}
+
+	mutex_unlock(&sl->master->bus_mutex);
+	return 0;
+}
+
+static int w1_ds2760_store_eeprom(struct device *dev, int addr)
+{
+	return w1_ds2760_eeprom_cmd(dev, addr, W1_DS2760_COPY_DATA);
+}
+
+static int w1_ds2760_recall_eeprom(struct device *dev, int addr)
+{
+	return w1_ds2760_eeprom_cmd(dev, addr, W1_DS2760_RECALL_DATA);
+}
+
+static ssize_t w1_slave_read(struct file *filp, struct kobject *kobj,
+			     struct bin_attribute *bin_attr, char *buf,
+			     loff_t off, size_t count)
+{
+	struct device *dev = container_of(kobj, struct device, kobj);
+	return w1_ds2760_read(dev, buf, off, count);
+}
+
+static BIN_ATTR_RO(w1_slave, DS2760_DATA_SIZE);
+
+static struct bin_attribute *w1_ds2760_bin_attrs[] = {
+	&bin_attr_w1_slave,
+	NULL,
+};
+
+static const struct attribute_group w1_ds2760_group = {
+	.bin_attrs = w1_ds2760_bin_attrs,
+};
+
+static const struct attribute_group *w1_ds2760_groups[] = {
+	&w1_ds2760_group,
+	NULL,
+};
+/* 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 */
+#ifdef CONFIG_MACH_H4700
+	0,
+	3600,	/* HP iPAQ hx4700 3.7V 3600mAh (359114-001) */
+#endif
+};
+
+/* 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->dev, di->raw + start, start, count);
+	if (ret != count) {
+		dev_warn(di->dev, "call to w1_ds2760_read failed (0x%p)\n",
+			 di->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->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->dev, &status, DS2760_STATUS_WRITE_REG, 1);
+	w1_ds2760_store_eeprom(di->dev, DS2760_EEPROM_BLOCK1);
+	w1_ds2760_recall_eeprom(di->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->dev, &rated_capacity, DS2760_RATED_CAPACITY, 1);
+	w1_ds2760_store_eeprom(di->dev, DS2760_EEPROM_BLOCK1);
+	w1_ds2760_recall_eeprom(di->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->dev, tmp, DS2760_ACTIVE_FULL, sizeof(tmp));
+	w1_ds2760_store_eeprom(di->dev, DS2760_EEPROM_BLOCK0);
+	w1_ds2760_recall_eeprom(di->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);
+}
+
+static void ds2760_battery_external_power_changed(struct power_supply *psy)
+{
+	struct ds2760_device_info *di = power_supply_get_drvdata(psy);
+
+	dev_dbg(di->dev, "%s\n", __func__);
+
+	mod_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->dev, &bias, DS2760_CURRENT_OFFSET_BIAS, 1);
+	w1_ds2760_store_eeprom(di->dev, DS2760_EEPROM_BLOCK1);
+	w1_ds2760_recall_eeprom(di->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 = power_supply_get_drvdata(psy);
+
+	/* postpone the actual work by 20 secs. This is for debouncing GPIO
+	 * signals and to let the current value settle. See AN4188. */
+	mod_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 = power_supply_get_drvdata(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 = power_supply_get_drvdata(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_pm_notifier(struct notifier_block *notifier,
+			      unsigned long pm_event,
+			      void *unused)
+{
+	struct ds2760_device_info *di =
+		container_of(notifier, struct ds2760_device_info, pm_notifier);
+
+	switch (pm_event) {
+	case PM_HIBERNATION_PREPARE:
+	case PM_SUSPEND_PREPARE:
+		di->charge_status = POWER_SUPPLY_STATUS_UNKNOWN;
+		break;
+
+	case PM_POST_RESTORE:
+	case PM_POST_HIBERNATION:
+	case PM_POST_SUSPEND:
+		di->charge_status = POWER_SUPPLY_STATUS_UNKNOWN;
+		power_supply_changed(di->bat);
+		mod_delayed_work(di->monitor_wqueue, &di->monitor_work, HZ);
+
+		break;
+
+	case PM_RESTORE_PREPARE:
+	default:
+		break;
+	}
+
+	return NOTIFY_DONE;
+}
+
+static int w1_ds2760_add_slave(struct w1_slave *sl)
+{
+	struct power_supply_config psy_cfg = {};
+	struct ds2760_device_info *di;
+	struct device *dev = &sl->dev;
+	int retval = 0;
+	char name[32];
+	char status;
+
+	di = devm_kzalloc(dev, sizeof(*di), GFP_KERNEL);
+	if (!di) {
+		retval = -ENOMEM;
+		goto di_alloc_failed;
+	}
+
+	snprintf(name, sizeof(name), "ds2760-battery.%d", dev->id);
+
+	di->dev				= dev;
+	di->bat_desc.name		= name;
+	di->bat_desc.type		= POWER_SUPPLY_TYPE_BATTERY;
+	di->bat_desc.properties		= ds2760_battery_props;
+	di->bat_desc.num_properties	= ARRAY_SIZE(ds2760_battery_props);
+	di->bat_desc.get_property	= ds2760_battery_get_property;
+	di->bat_desc.set_property	= ds2760_battery_set_property;
+	di->bat_desc.property_is_writeable =
+				  ds2760_battery_property_is_writeable;
+	di->bat_desc.set_charged	= ds2760_battery_set_charged;
+	di->bat_desc.external_power_changed =
+				  ds2760_battery_external_power_changed;
+
+	psy_cfg.drv_data = di;
+
+	if (dev->of_node) {
+		u32 tmp;
+
+		psy_cfg.of_node = dev->of_node;
+
+		if (!of_property_read_bool(dev->of_node, "maxim,pmod-enabled"))
+			pmod_enabled = true;
+
+		if (!of_property_read_u32(dev->of_node,
+					  "maxim,cache-time-ms", &tmp))
+			cache_time = tmp;
+
+		if (!of_property_read_u32(dev->of_node,
+					  "rated-capacity-microamp-hours",
+					  &tmp))
+			rated_capacity = tmp / 10; /* property is in mAh */
+	}
+
+	di->charge_status = POWER_SUPPLY_STATUS_UNKNOWN;
+
+	sl->family_data = di;
+
+	/* 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 or device tree */
+	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);
+
+	di->bat = power_supply_register(dev, &di->bat_desc, &psy_cfg);
+	if (IS_ERR(di->bat)) {
+		dev_err(di->dev, "failed to register battery\n");
+		retval = PTR_ERR(di->bat);
+		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 = alloc_ordered_workqueue(name, WQ_MEM_RECLAIM);
+	if (!di->monitor_wqueue) {
+		retval = -ESRCH;
+		goto workqueue_failed;
+	}
+	queue_delayed_work(di->monitor_wqueue, &di->monitor_work, HZ * 1);
+
+	di->pm_notifier.notifier_call = ds2760_pm_notifier;
+	register_pm_notifier(&di->pm_notifier);
+
+	goto success;
+
+workqueue_failed:
+	power_supply_unregister(di->bat);
+batt_failed:
+di_alloc_failed:
+success:
+	return retval;
+}
+
+static void w1_ds2760_remove_slave(struct w1_slave *sl)
+{
+	struct ds2760_device_info *di = sl->family_data;
+
+	unregister_pm_notifier(&di->pm_notifier);
+	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);
+}
+
+#ifdef CONFIG_OF
+static const struct of_device_id w1_ds2760_of_ids[] = {
+	{ .compatible = "maxim,ds2760" },
+	{}
+};
+#endif
+
+static struct w1_family_ops w1_ds2760_fops = {
+	.add_slave	= w1_ds2760_add_slave,
+	.remove_slave	= w1_ds2760_remove_slave,
+	.groups		= w1_ds2760_groups,
+};
+
+static struct w1_family w1_ds2760_family = {
+	.fid		= W1_FAMILY_DS2760,
+	.fops		= &w1_ds2760_fops,
+	.of_match_table	= of_match_ptr(w1_ds2760_of_ids),
+};
+module_w1_family(w1_ds2760_family);
+
+MODULE_AUTHOR("Szabolcs Gyurko <szabolcs.gyurko@tlt.hu>, "
+	      "Matt Reimer <mreimer@vpop.net>, "
+	      "Anton Vorontsov <cbou@mail.ru>");
+MODULE_DESCRIPTION("1-wire Driver Dallas 2760 battery monitor chip");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("w1-family-" __stringify(W1_FAMILY_DS2760));