Merge git://git.infradead.org/~dwmw2/battery-2.6

* git://git.infradead.org/~dwmw2/battery-2.6:
  [BATTERY] ds2760 W1 slave
  [BATTERY] One Laptop Per Child power/battery driver
  [BATTERY] Apple PMU driver
  [BATTERY] 1-Wire ds2760 chip battery driver
  [BATTERY] APM emulation driver for class batteries
  [BATTERY] pda_power platform driver
  [BATTERY] Universal power supply class (was: battery class)

Documentation/power_supply_class.txt

+Linux power supply class
+========================
+
+Synopsis
+~~~~~~~~
+Power supply class used to represent battery, UPS, AC or DC power supply
+properties to user-space.
+
+It defines core set of attributes, which should be applicable to (almost)
+every power supply out there. Attributes are available via sysfs and uevent
+interfaces.
+
+Each attribute has well defined meaning, up to unit of measure used. While
+the attributes provided are believed to be universally applicable to any
+power supply, specific monitoring hardware may not be able to provide them
+all, so any of them may be skipped.
+
+Power supply class is extensible, and allows to define drivers own attributes.
+The core attribute set is subject to the standard Linux evolution (i.e.
+if it will be found that some attribute is applicable to many power supply
+types or their drivers, it can be added to the core set).
+
+It also integrates with LED framework, for the purpose of providing
+typically expected feedback of battery charging/fully charged status and
+AC/USB power supply online status. (Note that specific details of the
+indication (including whether to use it at all) are fully controllable by
+user and/or specific machine defaults, per design principles of LED
+framework).
+
+
+Attributes/properties
+~~~~~~~~~~~~~~~~~~~~~
+Power supply class has predefined set of attributes, this eliminates code
+duplication across drivers. Power supply class insist on reusing its
+predefined attributes *and* their units.
+
+So, userspace gets predictable set of attributes and their units for any
+kind of power supply, and can process/present them to a user in consistent
+manner. Results for different power supplies and machines are also directly
+comparable.
+
+See drivers/power/ds2760_battery.c and drivers/power/pda_power.c for the
+example how to declare and handle attributes.
+
+
+Units
+~~~~~
+Quoting include/linux/power_supply.h:
+
+  All voltages, currents, charges, energies, time and temperatures in µV,
+  µA, µAh, µWh, seconds and tenths of degree Celsius unless otherwise
+  stated. It's driver's job to convert its raw values to units in which
+  this class operates.
+
+
+Attributes/properties detailed
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+~ ~ ~ ~ ~ ~ ~  Charge/Energy/Capacity - how to not confuse  ~ ~ ~ ~ ~ ~ ~
+~                                                                       ~
+~ Because both "charge" (µAh) and "energy" (µWh) represents "capacity"  ~
+~ of battery, this class distinguish these terms. Don't mix them!       ~
+~                                                                       ~
+~ CHARGE_* attributes represents capacity in µAh only.                  ~
+~ ENERGY_* attributes represents capacity in µWh only.                  ~
+~ CAPACITY attribute represents capacity in *percents*, from 0 to 100.  ~
+~                                                                       ~
+~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
+
+Postfixes:
+_AVG - *hardware* averaged value, use it if your hardware is really able to
+report averaged values.
+_NOW - momentary/instantaneous values.
+
+STATUS - this attribute represents operating status (charging, full,
+discharging (i.e. powering a load), etc.). This corresponds to
+BATTERY_STATUS_* values, as defined in battery.h.
+
+HEALTH - represents health of the battery, values corresponds to
+POWER_SUPPLY_HEALTH_*, defined in battery.h.
+
+VOLTAGE_MAX_DESIGN, VOLTAGE_MIN_DESIGN - design values for maximal and
+minimal power supply voltages. Maximal/minimal means values of voltages
+when battery considered "full"/"empty" at normal conditions. Yes, there is
+no direct relation between voltage and battery capacity, but some dumb
+batteries use voltage for very approximated calculation of capacity.
+Battery driver also can use this attribute just to inform userspace
+about maximal and minimal voltage thresholds of a given battery.
+
+CHARGE_FULL_DESIGN, CHARGE_EMPTY_DESIGN - design charge values, when
+battery considered full/empty.
+
+ENERGY_FULL_DESIGN, ENERGY_EMPTY_DESIGN - same as above but for energy.
+
+CHARGE_FULL, CHARGE_EMPTY - These attributes means "last remembered value
+of charge when battery became full/empty". It also could mean "value of
+charge when battery considered full/empty at given conditions (temperature,
+age)". I.e. these attributes represents real thresholds, not design values.
+
+ENERGY_FULL, ENERGY_EMPTY - same as above but for energy.
+
+CAPACITY - capacity in percents.
+CAPACITY_LEVEL - capacity level. This corresponds to
+POWER_SUPPLY_CAPACITY_LEVEL_*.
+
+TEMP - temperature of the power supply.
+TEMP_AMBIENT - ambient temperature.
+
+TIME_TO_EMPTY - seconds left for battery to be considered empty (i.e.
+while battery powers a load)
+TIME_TO_FULL - seconds left for battery to be considered full (i.e.
+while battery is charging)
+
+
+Battery <-> external power supply interaction
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+Often power supplies are acting as supplies and supplicants at the same
+time. Batteries are good example. So, batteries usually care if they're
+externally powered or not.
+
+For that case, power supply class implements notification mechanism for
+batteries.
+
+External power supply (AC) lists supplicants (batteries) names in
+"supplied_to" struct member, and each power_supply_changed() call
+issued by external power supply will notify supplicants via
+external_power_changed callback.
+
+
+QA
+~~
+Q: Where is POWER_SUPPLY_PROP_XYZ attribute?
+A: If you cannot find attribute suitable for your driver needs, feel free
+   to add it and send patch along with your driver.
+
+   The attributes available currently are the ones currently provided by the
+   drivers written.
+
+   Good candidates to add in future: model/part#, cycle_time, manufacturer,
+   etc.
+
+
+Q: I have some very specific attribute (e.g. battery color), should I add
+   this attribute to standard ones?
+A: Most likely, no. Such attribute can be placed in the driver itself, if
+   it is useful. Of course, if the attribute in question applicable to
+   large set of batteries, provided by many drivers, and/or comes from
+   some general battery specification/standard, it may be a candidate to
+   be added to the core attribute set.
+
+
+Q: Suppose, my battery monitoring chip/firmware does not provides capacity
+   in percents, but provides charge_{now,full,empty}. Should I calculate
+   percentage capacity manually, inside the driver, and register CAPACITY
+   attribute? The same question about time_to_empty/time_to_full.
+A: Most likely, no. This class is designed to export properties which are
+   directly measurable by the specific hardware available.
+
+   Inferring not available properties using some heuristics or mathematical
+   model is not subject of work for a battery driver. Such functionality
+   should be factored out, and in fact, apm_power, the driver to serve
+   legacy APM API on top of power supply class, uses a simple heuristic of
+   approximating remaining battery capacity based on its charge, current,
+   voltage and so on. But full-fledged battery model is likely not subject
+   for kernel at all, as it would require floating point calculation to deal
+   with things like differential equations and Kalman filters. This is
+   better be handled by batteryd/libbattery, yet to be written.

drivers/Kconfig

@@ -52,6 +52,8 @@ source "drivers/spi/Kconfig"
 
 source "drivers/w1/Kconfig"
 
+source "drivers/power/Kconfig"
+
 source "drivers/hwmon/Kconfig"
 
 source "drivers/mfd/Kconfig"

drivers/Makefile

@@ -61,6 +61,7 @@ obj-$(CONFIG_I2O)		+= message/
 obj-$(CONFIG_RTC_LIB)		+= rtc/
 obj-y				+= i2c/
 obj-$(CONFIG_W1)		+= w1/
+obj-$(CONFIG_POWER_SUPPLY)	+= power/
 obj-$(CONFIG_HWMON)		+= hwmon/
 obj-$(CONFIG_PHONE)		+= telephony/
 obj-$(CONFIG_MD)		+= md/

drivers/power/Kconfig

+menuconfig POWER_SUPPLY
+	tristate "Power supply class support"
+	help
+	  Say Y here to enable power supply class support. This allows
+	  power supply (batteries, AC, USB) monitoring by userspace
+	  via sysfs and uevent (if available) and/or APM kernel interface
+	  (if selected below).
+
+if POWER_SUPPLY
+
+config POWER_SUPPLY_DEBUG
+	bool "Power supply debug"
+	help
+	  Say Y here to enable debugging messages for power supply class
+	  and drivers.
+
+config PDA_POWER
+	tristate "Generic PDA/phone power driver"
+	help
+	  Say Y here to enable generic power driver for PDAs and phones with
+	  one or two external power supplies (AC/USB) connected to main and
+	  backup batteries, and optional builtin charger.
+
+config APM_POWER
+	tristate "APM emulation for class batteries"
+	depends on APM_EMULATION
+	help
+	  Say Y here to enable support APM status emulation using
+	  battery class devices.
+
+config BATTERY_DS2760
+	tristate "DS2760 battery driver (HP iPAQ & others)"
+	select W1
+	select W1_SLAVE_DS2760
+	help
+	  Say Y here to enable support for batteries with ds2760 chip.
+
+config BATTERY_PMU
+	tristate "Apple PMU battery"
+	depends on ADB_PMU
+	help
+	  Say Y here to expose battery information on Apple machines
+	  through the generic battery class.
+
+config BATTERY_OLPC
+	tristate "One Laptop Per Child battery"
+	depends on X86_32 && OLPC
+	help
+	  Say Y to enable support for the battery on the OLPC laptop.
+
+endif # POWER_SUPPLY

drivers/power/Makefile

+power_supply-objs := power_supply_core.o
+
+ifeq ($(CONFIG_SYSFS),y)
+power_supply-objs += power_supply_sysfs.o
+endif
+
+ifeq ($(CONFIG_LEDS_TRIGGERS),y)
+power_supply-objs += power_supply_leds.o
+endif
+
+ifeq ($(CONFIG_POWER_SUPPLY_DEBUG),y)
+EXTRA_CFLAGS += -DDEBUG
+endif
+
+obj-$(CONFIG_POWER_SUPPLY)	+= power_supply.o
+
+obj-$(CONFIG_PDA_POWER)		+= pda_power.o
+obj-$(CONFIG_APM_POWER)		+= apm_power.o
+
+obj-$(CONFIG_BATTERY_DS2760)	+= ds2760_battery.o
+obj-$(CONFIG_BATTERY_PMU)	+= pmu_battery.o
+obj-$(CONFIG_BATTERY_OLPC)	+= olpc_battery.o

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 struct power_supply *main_battery;
+
+static void find_main_battery(void)
+{
+	struct device *dev;
+	struct power_supply *bat, *batm;
+	union power_supply_propval full;
+	int max_charge = 0;
+
+	main_battery = NULL;
+	batm = NULL;
+	list_for_each_entry(dev, &power_supply_class->devices, node) {
+		bat = dev_get_drvdata(dev);
+		/* If none of battery devices cantains 'use_for_apm' flag,
+		   choice one with maximum design charge */
+		if (!PSY_PROP(bat, CHARGE_FULL_DESIGN, &full)) {
+			if (full.intval > max_charge) {
+				batm = bat;
+				max_charge = full.intval;
+			}
+		}
+
+		if (bat->use_for_apm)
+			main_battery = bat;
+	}
+	if (!main_battery)
+		main_battery = batm;
+
+	return;
+}
+
+static int calculate_time(int status)
+{
+	union power_supply_propval charge_full, charge_empty;
+	union power_supply_propval charge, I;
+
+	if (MPSY_PROP(CHARGE_FULL, &charge_full)) {
+		/* if battery can't report this property, use design value */
+		if (MPSY_PROP(CHARGE_FULL_DESIGN, &charge_full))
+			return -1;
+	}
+
+	if (MPSY_PROP(CHARGE_EMPTY, &charge_empty)) {
+		/* if battery can't report this property, use design value */
+		if (MPSY_PROP(CHARGE_EMPTY_DESIGN, &charge_empty))
+			charge_empty.intval = 0;
+	}
+
+	if (MPSY_PROP(CHARGE_AVG, &charge)) {
+		/* if battery can't report average value, use momentary */
+		if (MPSY_PROP(CHARGE_NOW, &charge))
+			return -1;
+	}
+
+	if (MPSY_PROP(CURRENT_AVG, &I)) {
+		/* if battery can't report average value, use momentary */
+		if (MPSY_PROP(CURRENT_NOW, &I))
+			return -1;
+	}
+
+	if (status == POWER_SUPPLY_STATUS_CHARGING)
+		return ((charge.intval - charge_full.intval) * 60L) /
+		       I.intval;
+	else
+		return -((charge.intval - charge_empty.intval) * 60L) /
+			I.intval;
+}
+
+static int calculate_capacity(int using_charge)
+{
+	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;
+
+	if (using_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;
+	} else {
+		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;
+	}
+
+	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;
+
+	down(&power_supply_class->sem);
+	find_main_battery();
+	if (!main_battery) {
+		up(&power_supply_class->sem);
+		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(0);
+		/* if failed try calculate using charge instead */
+		if (info->battery_life == -1)
+			info->battery_life = calculate_capacity(1);
+	}
+
+	/* 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)) {
+			if (MPSY_PROP(TIME_TO_FULL_NOW, &time_to_full))
+				info->time = calculate_time(status.intval);
+			else
+				info->time = time_to_full.intval / 60;
+		}
+	} else {
+		if (MPSY_PROP(TIME_TO_EMPTY_AVG, &time_to_empty)) {
+			if (MPSY_PROP(TIME_TO_EMPTY_NOW, &time_to_empty))
+				info->time = calculate_time(status.intval);
+			else
+				info->time = time_to_empty.intval / 60;
+		}
+	}
+
+	up(&power_supply_class->sem);
+	return;
+}
+
+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;
+	return;
+}
+
+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");

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/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;
+};
+
+static unsigned int cache_time = 1000;
+module_param(cache_time, uint, 0644);
+MODULE_PARM_DESC(cache_time, "cache time in milliseconds");
+
+/* 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 */
+	1440,	/* Lishen */
+	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];
+
+	scale[0] = di->raw[DS2760_ACTIVE_FULL] << 8 |
+		   di->raw[DS2760_ACTIVE_FULL + 1];
+	for (i = 1; i < 5; i++)
+		scale[i] = scale[i - 1] + di->raw[DS2760_ACTIVE_FULL + 2 + 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 */
+
+	/* 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)
+		di->life_sec = -((di->accum_current_uAh - di->empty_uAh) *
+				 3600L) / di->current_uA;
+	else
+		di->life_sec = 0;
+
+	return 0;
+}
+
+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 {
+				unsigned char acr[2];
+				int acr_val;
+
+				/* acr is in units of 0.25 mAh */
+				acr_val = di->full_active_uAh * 4L / 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 reset failed\n");
+
+				di->charge_status = POWER_SUPPLY_STATUS_FULL;
+			}
+		}
+	} else {
+		di->charge_status = POWER_SUPPLY_STATUS_DISCHARGING;
+		di->full_counter = 0;
+	}
+
+	if (di->charge_status != old_charge_status)
+		power_supply_changed(&di->bat);
+
+	return;
+}
+
+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", __FUNCTION__);
+
+	ds2760_battery_update_status(di);
+	queue_delayed_work(di->monitor_wqueue, &di->monitor_work, interval);
+
+	return;
+}
+
+#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", __FUNCTION__);
+
+	cancel_delayed_work(&di->monitor_work);
+	queue_delayed_work(di->monitor_wqueue, &di->monitor_work, HZ/10);
+
+	return;
+}
+
+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;
+	default:
+		return -EINVAL;
+	}
+
+	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,
+};
+
+static int ds2760_battery_probe(struct platform_device *pdev)
+{
+	int retval = 0;
+	struct ds2760_device_info *di;
+	struct ds2760_platform_data *pdata;
+
+	di = kzalloc(sizeof(*di), GFP_KERNEL);
+	if (!di) {
+		retval = -ENOMEM;
+		goto di_alloc_failed;
+	}
+
+	platform_set_drvdata(pdev, di);
+
+	pdata = pdev->dev.platform_data;
+	di->dev		= &pdev->dev;
+	di->w1_dev	     = pdev->dev.parent;
+	di->bat.name	   = pdev->dev.bus_id;
+	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.external_power_changed =
+				  ds2760_battery_external_power_changed;
+
+	di->charge_status = POWER_SUPPLY_STATUS_UNKNOWN;
+
+	retval = power_supply_register(&pdev->dev, &di->bat);
+	if (retval) {
+		dev_err(di->dev, "failed to register battery");
+		goto batt_failed;
+	}
+
+	INIT_DELAYED_WORK(&di->monitor_work, ds2760_battery_work);
+	di->monitor_wqueue = create_singlethread_workqueue(pdev->dev.bus_id);
+	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_rearming_delayed_workqueue(di->monitor_wqueue,
+					  &di->monitor_work);
+	destroy_workqueue(di->monitor_wqueue);
+	power_supply_unregister(&di->bat);
+
+	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 */
+
+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);
+	return;
+}
+
+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");

drivers/power/olpc_battery.c

+/*
+ * Battery driver for One Laptop Per Child board.
+ *
+ *	Copyright © 2006  David Woodhouse <dwmw2@infradead.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/module.h>
+#include <linux/err.h>
+#include <linux/platform_device.h>
+#include <linux/power_supply.h>
+#include <linux/jiffies.h>
+#include <linux/sched.h>
+#include <asm/olpc.h>
+
+
+#define EC_BAT_VOLTAGE	0x10	/* uint16_t,	*9.76/32,    mV   */
+#define EC_BAT_CURRENT	0x11	/* int16_t,	*15.625/120, mA   */
+#define EC_BAT_ACR	0x12
+#define EC_BAT_TEMP	0x13	/* uint16_t,	*100/256,   °C  */
+#define EC_AMB_TEMP	0x14	/* uint16_t,	*100/256,   °C  */
+#define EC_BAT_STATUS	0x15	/* uint8_t,	bitmask */
+#define EC_BAT_SOC	0x16	/* uint8_t,	percentage */
+#define EC_BAT_SERIAL	0x17	/* uint8_t[6] */
+#define EC_BAT_EEPROM	0x18	/* uint8_t adr as input, uint8_t output */
+#define EC_BAT_ERRCODE	0x1f	/* uint8_t,	bitmask */
+
+#define BAT_STAT_PRESENT	0x01
+#define BAT_STAT_FULL		0x02
+#define BAT_STAT_LOW		0x04
+#define BAT_STAT_DESTROY	0x08
+#define BAT_STAT_AC		0x10
+#define BAT_STAT_CHARGING	0x20
+#define BAT_STAT_DISCHARGING	0x40
+
+#define BAT_ERR_INFOFAIL	0x02
+#define BAT_ERR_OVERVOLTAGE	0x04
+#define BAT_ERR_OVERTEMP	0x05
+#define BAT_ERR_GAUGESTOP	0x06
+#define BAT_ERR_OUT_OF_CONTROL	0x07
+#define BAT_ERR_ID_FAIL		0x09
+#define BAT_ERR_ACR_FAIL	0x10
+
+#define BAT_ADDR_MFR_TYPE	0x5F
+
+/*********************************************************************
+ *		Power
+ *********************************************************************/
+
+static int olpc_ac_get_prop(struct power_supply *psy,
+			    enum power_supply_property psp,
+			    union power_supply_propval *val)
+{
+	int ret = 0;
+	uint8_t status;
+
+	switch (psp) {
+	case POWER_SUPPLY_PROP_ONLINE:
+		ret = olpc_ec_cmd(EC_BAT_STATUS, NULL, 0, &status, 1);
+		if (ret)
+			return ret;
+
+		val->intval = !!(status & BAT_STAT_AC);
+		break;
+	default:
+		ret = -EINVAL;
+		break;
+	}
+	return ret;
+}
+
+static enum power_supply_property olpc_ac_props[] = {
+	POWER_SUPPLY_PROP_ONLINE,
+};
+
+static struct power_supply olpc_ac = {
+	.name = "olpc-ac",
+	.type = POWER_SUPPLY_TYPE_MAINS,
+	.properties = olpc_ac_props,
+	.num_properties = ARRAY_SIZE(olpc_ac_props),
+	.get_property = olpc_ac_get_prop,
+};
+
+/*********************************************************************
+ *		Battery properties
+ *********************************************************************/
+static int olpc_bat_get_property(struct power_supply *psy,
+				 enum power_supply_property psp,
+				 union power_supply_propval *val)
+{
+	int ret = 0;
+	int16_t ec_word;
+	uint8_t ec_byte;
+
+	ret = olpc_ec_cmd(EC_BAT_STATUS, NULL, 0, &ec_byte, 1);
+	if (ret)
+		return ret;
+
+	/* Theoretically there's a race here -- the battery could be
+	   removed immediately after we check whether it's present, and
+	   then we query for some other property of the now-absent battery.
+	   It doesn't matter though -- the EC will return the last-known
+	   information, and it's as if we just ran that _little_ bit faster
+	   and managed to read it out before the battery went away. */
+	if (!(ec_byte & BAT_STAT_PRESENT) && psp != POWER_SUPPLY_PROP_PRESENT)
+		return -ENODEV;
+
+	switch (psp) {
+	case POWER_SUPPLY_PROP_STATUS:
+		if (olpc_platform_info.ecver > 0x44) {
+			if (ec_byte & BAT_STAT_CHARGING)
+				val->intval = POWER_SUPPLY_STATUS_CHARGING;
+			else if (ec_byte & BAT_STAT_DISCHARGING)
+				val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
+			else if (ec_byte & BAT_STAT_FULL)
+				val->intval = POWER_SUPPLY_STATUS_FULL;
+			else /* er,... */
+				val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
+		} else {
+			/* Older EC didn't report charge/discharge bits */
+			if (!(ec_byte & BAT_STAT_AC)) /* No AC means discharging */
+				val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
+			else if (ec_byte & BAT_STAT_FULL)
+				val->intval = POWER_SUPPLY_STATUS_FULL;
+			else /* Not _necessarily_ true but EC doesn't tell all yet */
+				val->intval = POWER_SUPPLY_STATUS_CHARGING;
+			break;
+		}
+	case POWER_SUPPLY_PROP_PRESENT:
+		val->intval = !!(ec_byte & BAT_STAT_PRESENT);
+		break;
+
+	case POWER_SUPPLY_PROP_HEALTH:
+		if (ec_byte & BAT_STAT_DESTROY)
+			val->intval = POWER_SUPPLY_HEALTH_DEAD;
+		else {
+			ret = olpc_ec_cmd(EC_BAT_ERRCODE, NULL, 0, &ec_byte, 1);
+			if (ret)
+				return ret;
+
+			switch (ec_byte) {
+			case 0:
+				val->intval = POWER_SUPPLY_HEALTH_GOOD;
+				break;
+
+			case BAT_ERR_OVERTEMP:
+				val->intval = POWER_SUPPLY_HEALTH_OVERHEAT;
+				break;
+
+			case BAT_ERR_OVERVOLTAGE:
+				val->intval = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
+				break;
+
+			case BAT_ERR_INFOFAIL:
+			case BAT_ERR_OUT_OF_CONTROL:
+			case BAT_ERR_ID_FAIL:
+			case BAT_ERR_ACR_FAIL:
+				val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
+				break;
+
+			default:
+				/* Eep. We don't know this failure code */
+				return -EIO;
+			}
+		}
+		break;
+
+	case POWER_SUPPLY_PROP_MANUFACTURER:
+		ec_byte = BAT_ADDR_MFR_TYPE;
+		ret = olpc_ec_cmd(EC_BAT_EEPROM, &ec_byte, 1, &ec_byte, 1);
+		if (ret)
+			return ret;
+
+		switch (ec_byte >> 4) {
+		case 1:
+			val->strval = "Gold Peak";
+			break;
+		case 2:
+			val->strval = "BYD";
+			break;
+		default:
+			val->strval = "Unknown";
+			break;
+		}
+		break;
+	case POWER_SUPPLY_PROP_TECHNOLOGY:
+		ec_byte = BAT_ADDR_MFR_TYPE;
+		ret = olpc_ec_cmd(EC_BAT_EEPROM, &ec_byte, 1, &ec_byte, 1);
+		if (ret)
+			return ret;
+
+		switch (ec_byte & 0xf) {
+		case 1:
+			val->intval = POWER_SUPPLY_TECHNOLOGY_NiMH;
+			break;
+		case 2:
+			val->intval = POWER_SUPPLY_TECHNOLOGY_LiFe;
+			break;
+		default:
+			val->intval = POWER_SUPPLY_TECHNOLOGY_UNKNOWN;
+			break;
+		}
+		break;
+	case POWER_SUPPLY_PROP_VOLTAGE_AVG:
+		ret = olpc_ec_cmd(EC_BAT_VOLTAGE, NULL, 0, (void *)&ec_word, 2);
+		if (ret)
+			return ret;
+
+		ec_word = be16_to_cpu(ec_word);
+		val->intval = ec_word * 9760L / 32;
+		break;
+	case POWER_SUPPLY_PROP_CURRENT_AVG:
+		ret = olpc_ec_cmd(EC_BAT_CURRENT, NULL, 0, (void *)&ec_word, 2);
+		if (ret)
+			return ret;
+
+		ec_word = be16_to_cpu(ec_word);
+		val->intval = ec_word * 15625L / 120;
+		break;
+	case POWER_SUPPLY_PROP_CAPACITY:
+		ret = olpc_ec_cmd(EC_BAT_SOC, NULL, 0, &ec_byte, 1);
+		if (ret)
+			return ret;
+		val->intval = ec_byte;
+		break;
+	case POWER_SUPPLY_PROP_CAPACITY_LEVEL:
+		if (ec_byte & BAT_STAT_FULL)
+			val->intval = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
+		else if (ec_byte & BAT_STAT_LOW)
+			val->intval = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
+		else
+			val->intval = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
+		break;
+	case POWER_SUPPLY_PROP_TEMP:
+		ret = olpc_ec_cmd(EC_BAT_TEMP, NULL, 0, (void *)&ec_word, 2);
+		if (ret)
+			return ret;
+		ec_word = be16_to_cpu(ec_word);
+		val->intval = ec_word * 100 / 256;
+		break;
+	case POWER_SUPPLY_PROP_TEMP_AMBIENT:
+		ret = olpc_ec_cmd(EC_AMB_TEMP, NULL, 0, (void *)&ec_word, 2);
+		if (ret)
+			return ret;
+
+		ec_word = be16_to_cpu(ec_word);
+		val->intval = ec_word * 100 / 256;
+		break;
+	default:
+		ret = -EINVAL;
+		break;
+	}
+
+	return ret;
+}
+
+static enum power_supply_property olpc_bat_props[] = {
+	POWER_SUPPLY_PROP_STATUS,
+	POWER_SUPPLY_PROP_PRESENT,
+	POWER_SUPPLY_PROP_HEALTH,
+	POWER_SUPPLY_PROP_TECHNOLOGY,
+	POWER_SUPPLY_PROP_VOLTAGE_AVG,
+	POWER_SUPPLY_PROP_CURRENT_AVG,
+	POWER_SUPPLY_PROP_CAPACITY,
+	POWER_SUPPLY_PROP_CAPACITY_LEVEL,
+	POWER_SUPPLY_PROP_TEMP,
+	POWER_SUPPLY_PROP_TEMP_AMBIENT,
+	POWER_SUPPLY_PROP_MANUFACTURER,
+};
+
+/*********************************************************************
+ *		Initialisation
+ *********************************************************************/
+
+static struct platform_device *bat_pdev;
+
+static struct power_supply olpc_bat = {
+	.properties = olpc_bat_props,
+	.num_properties = ARRAY_SIZE(olpc_bat_props),
+	.get_property = olpc_bat_get_property,
+	.use_for_apm = 1,
+};
+
+void olpc_battery_trigger_uevent(unsigned long cause)
+{
+	if (cause & EC_SCI_SRC_ACPWR)
+		kobject_uevent(&olpc_ac.dev->kobj, KOBJ_CHANGE);
+	if (cause & (EC_SCI_SRC_BATERR|EC_SCI_SRC_BATSOC|EC_SCI_SRC_BATTERY))
+		kobject_uevent(&olpc_bat.dev->kobj, KOBJ_CHANGE);
+}
+
+static int __init olpc_bat_init(void)
+{
+	int ret = 0;
+	uint8_t status;
+
+	if (!olpc_platform_info.ecver)
+		return -ENXIO;
+	if (olpc_platform_info.ecver < 0x43) {
+		printk(KERN_NOTICE "OLPC EC version 0x%02x too old for battery driver.\n", olpc_platform_info.ecver);
+		return -ENXIO;
+	}
+
+	ret = olpc_ec_cmd(EC_BAT_STATUS, NULL, 0, &status, 1);
+	if (ret)
+		return ret;
+
+	/* Ignore the status. It doesn't actually matter */
+
+	bat_pdev = platform_device_register_simple("olpc-battery", 0, NULL, 0);
+	if (IS_ERR(bat_pdev))
+		return PTR_ERR(bat_pdev);
+
+	ret = power_supply_register(&bat_pdev->dev, &olpc_ac);
+	if (ret)
+		goto ac_failed;
+
+	olpc_bat.name = bat_pdev->name;
+
+	ret = power_supply_register(&bat_pdev->dev, &olpc_bat);
+	if (ret)
+		goto battery_failed;
+
+	olpc_register_battery_callback(&olpc_battery_trigger_uevent);
+	goto success;
+
+battery_failed:
+	power_supply_unregister(&olpc_ac);
+ac_failed:
+	platform_device_unregister(bat_pdev);
+success:
+	return ret;
+}
+
+static void __exit olpc_bat_exit(void)
+{
+	olpc_deregister_battery_callback();
+	power_supply_unregister(&olpc_bat);
+	power_supply_unregister(&olpc_ac);
+	platform_device_unregister(bat_pdev);
+	return;
+}
+
+module_init(olpc_bat_init);
+module_exit(olpc_bat_exit);
+
+MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Battery driver for One Laptop Per Child 'XO' machine");

drivers/power/pda_power.c

+/*
+ * Common power driver for PDAs and phones with one or two external
+ * power supplies (AC/USB) connected to main and backup batteries,
+ * and optional builtin charger.
+ *
+ * Copyright © 2007 Anton Vorontsov <cbou@mail.ru>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/interrupt.h>
+#include <linux/power_supply.h>
+#include <linux/pda_power.h>
+#include <linux/timer.h>
+#include <linux/jiffies.h>
+
+static inline unsigned int get_irq_flags(struct resource *res)
+{
+	unsigned int flags = IRQF_DISABLED | IRQF_SHARED;
+
+	flags |= res->flags & IRQF_TRIGGER_MASK;
+
+	return flags;
+}
+
+static struct device *dev;
+static struct pda_power_pdata *pdata;
+static struct resource *ac_irq, *usb_irq;
+static struct timer_list charger_timer;
+static struct timer_list supply_timer;
+
+static int pda_power_get_property(struct power_supply *psy,
+				  enum power_supply_property psp,
+				  union power_supply_propval *val)
+{
+	switch (psp) {
+	case POWER_SUPPLY_PROP_ONLINE:
+		if (psy->type == POWER_SUPPLY_TYPE_MAINS)
+			val->intval = pdata->is_ac_online ?
+				      pdata->is_ac_online() : 0;
+		else
+			val->intval = pdata->is_usb_online ?
+				      pdata->is_usb_online() : 0;
+		break;
+	default:
+		return -EINVAL;
+	}
+	return 0;
+}
+
+static enum power_supply_property pda_power_props[] = {
+	POWER_SUPPLY_PROP_ONLINE,
+};
+
+static char *pda_power_supplied_to[] = {
+	"main-battery",
+	"backup-battery",
+};
+
+static struct power_supply pda_power_supplies[] = {
+	{
+		.name = "ac",
+		.type = POWER_SUPPLY_TYPE_MAINS,
+		.supplied_to = pda_power_supplied_to,
+		.num_supplicants = ARRAY_SIZE(pda_power_supplied_to),
+		.properties = pda_power_props,
+		.num_properties = ARRAY_SIZE(pda_power_props),
+		.get_property = pda_power_get_property,
+	},
+	{
+		.name = "usb",
+		.type = POWER_SUPPLY_TYPE_USB,
+		.supplied_to = pda_power_supplied_to,
+		.num_supplicants = ARRAY_SIZE(pda_power_supplied_to),
+		.properties = pda_power_props,
+		.num_properties = ARRAY_SIZE(pda_power_props),
+		.get_property = pda_power_get_property,
+	},
+};
+
+static void update_charger(void)
+{
+	if (!pdata->set_charge)
+		return;
+
+	if (pdata->is_ac_online && pdata->is_ac_online()) {
+		dev_dbg(dev, "charger on (AC)\n");
+		pdata->set_charge(PDA_POWER_CHARGE_AC);
+	} else if (pdata->is_usb_online && pdata->is_usb_online()) {
+		dev_dbg(dev, "charger on (USB)\n");
+		pdata->set_charge(PDA_POWER_CHARGE_USB);
+	} else {
+		dev_dbg(dev, "charger off\n");
+		pdata->set_charge(0);
+	}
+
+	return;
+}
+
+static void supply_timer_func(unsigned long irq)
+{
+	if (ac_irq && irq == ac_irq->start)
+		power_supply_changed(&pda_power_supplies[0]);
+	else if (usb_irq && irq == usb_irq->start)
+		power_supply_changed(&pda_power_supplies[1]);
+	return;
+}
+
+static void charger_timer_func(unsigned long irq)
+{
+	update_charger();
+
+	/* Okay, charger set. Now wait a bit before notifying supplicants,
+	 * charge power should stabilize. */
+	supply_timer.data = irq;
+	mod_timer(&supply_timer,
+		  jiffies + msecs_to_jiffies(pdata->wait_for_charger));
+	return;
+}
+
+static irqreturn_t power_changed_isr(int irq, void *unused)
+{
+	/* Wait a bit before reading ac/usb line status and setting charger,
+	 * because ac/usb status readings may lag from irq. */
+	charger_timer.data = irq;
+	mod_timer(&charger_timer,
+		  jiffies + msecs_to_jiffies(pdata->wait_for_status));
+	return IRQ_HANDLED;
+}
+
+static int pda_power_probe(struct platform_device *pdev)
+{
+	int ret = 0;
+
+	dev = &pdev->dev;
+
+	if (pdev->id != -1) {
+		dev_err(dev, "it's meaningless to register several "
+			"pda_powers; use id = -1\n");
+		ret = -EINVAL;
+		goto wrongid;
+	}
+
+	pdata = pdev->dev.platform_data;
+
+	update_charger();
+
+	if (!pdata->wait_for_status)
+		pdata->wait_for_status = 500;
+
+	if (!pdata->wait_for_charger)
+		pdata->wait_for_charger = 500;
+
+	setup_timer(&charger_timer, charger_timer_func, 0);
+	setup_timer(&supply_timer, supply_timer_func, 0);
+
+	ac_irq = platform_get_resource_byname(pdev, IORESOURCE_IRQ, "ac");
+	usb_irq = platform_get_resource_byname(pdev, IORESOURCE_IRQ, "usb");
+	if (!ac_irq && !usb_irq) {
+		dev_err(dev, "no ac/usb irq specified\n");
+		ret = -ENODEV;
+		goto noirqs;
+	}
+
+	if (pdata->supplied_to) {
+		pda_power_supplies[0].supplied_to = pdata->supplied_to;
+		pda_power_supplies[1].supplied_to = pdata->supplied_to;
+		pda_power_supplies[0].num_supplicants = pdata->num_supplicants;
+		pda_power_supplies[1].num_supplicants = pdata->num_supplicants;
+	}
+
+	ret = power_supply_register(&pdev->dev, &pda_power_supplies[0]);
+	if (ret) {
+		dev_err(dev, "failed to register %s power supply\n",
+			pda_power_supplies[0].name);
+		goto supply0_failed;
+	}
+
+	ret = power_supply_register(&pdev->dev, &pda_power_supplies[1]);
+	if (ret) {
+		dev_err(dev, "failed to register %s power supply\n",
+			pda_power_supplies[1].name);
+		goto supply1_failed;
+	}
+
+	if (ac_irq) {
+		ret = request_irq(ac_irq->start, power_changed_isr,
+				  get_irq_flags(ac_irq), ac_irq->name,
+				  &pda_power_supplies[0]);
+		if (ret) {
+			dev_err(dev, "request ac irq failed\n");
+			goto ac_irq_failed;
+		}
+	}
+
+	if (usb_irq) {
+		ret = request_irq(usb_irq->start, power_changed_isr,
+				  get_irq_flags(usb_irq), usb_irq->name,
+				  &pda_power_supplies[1]);
+		if (ret) {
+			dev_err(dev, "request usb irq failed\n");
+			goto usb_irq_failed;
+		}
+	}
+
+	goto success;
+
+usb_irq_failed:
+	if (ac_irq)
+		free_irq(ac_irq->start, &pda_power_supplies[0]);
+ac_irq_failed:
+	power_supply_unregister(&pda_power_supplies[1]);
+supply1_failed:
+	power_supply_unregister(&pda_power_supplies[0]);
+supply0_failed:
+noirqs:
+wrongid:
+success:
+	return ret;
+}
+
+static int pda_power_remove(struct platform_device *pdev)
+{
+	if (usb_irq)
+		free_irq(usb_irq->start, &pda_power_supplies[1]);
+	if (ac_irq)
+		free_irq(ac_irq->start, &pda_power_supplies[0]);
+	del_timer_sync(&charger_timer);
+	del_timer_sync(&supply_timer);
+	power_supply_unregister(&pda_power_supplies[1]);
+	power_supply_unregister(&pda_power_supplies[0]);
+	return 0;
+}
+
+static struct platform_driver pda_power_pdrv = {
+	.driver = {
+		.name = "pda-power",
+	},
+	.probe = pda_power_probe,
+	.remove = pda_power_remove,
+};
+
+static int __init pda_power_init(void)
+{
+	return platform_driver_register(&pda_power_pdrv);
+}
+
+static void __exit pda_power_exit(void)
+{
+	platform_driver_unregister(&pda_power_pdrv);
+	return;
+}
+
+module_init(pda_power_init);
+module_exit(pda_power_exit);
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Anton Vorontsov <cbou@mail.ru>");

drivers/power/pmu_battery.c

+/*
+ * Battery class driver for Apple PMU
+ *
+ *	Copyright © 2006  David Woodhouse <dwmw2@infradead.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/err.h>
+#include <linux/power_supply.h>
+#include <linux/adb.h>
+#include <linux/pmu.h>
+
+static struct pmu_battery_dev {
+	struct power_supply bat;
+	struct pmu_battery_info *pbi;
+	char name[16];
+	int propval;
+} *pbats[PMU_MAX_BATTERIES];
+
+#define to_pmu_battery_dev(x) container_of(x, struct pmu_battery_dev, bat)
+
+/*********************************************************************
+ *		Power
+ *********************************************************************/
+
+static int pmu_get_ac_prop(struct power_supply *psy,
+			   enum power_supply_property psp,
+			   union power_supply_propval *val)
+{
+	switch (psp) {
+	case POWER_SUPPLY_PROP_ONLINE:
+		val->intval = (!!(pmu_power_flags & PMU_PWR_AC_PRESENT)) ||
+			      (pmu_battery_count == 0);
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static enum power_supply_property pmu_ac_props[] = {
+	POWER_SUPPLY_PROP_ONLINE,
+};
+
+static struct power_supply pmu_ac = {
+	.name = "pmu-ac",
+	.type = POWER_SUPPLY_TYPE_MAINS,
+	.properties = pmu_ac_props,
+	.num_properties = ARRAY_SIZE(pmu_ac_props),
+	.get_property = pmu_get_ac_prop,
+};
+
+/*********************************************************************
+ *		Battery properties
+ *********************************************************************/
+
+static char *pmu_batt_types[] = {
+	"Smart", "Comet", "Hooper", "Unknown"
+};
+
+static char *pmu_bat_get_model_name(struct pmu_battery_info *pbi)
+{
+	switch (pbi->flags & PMU_BATT_TYPE_MASK) {
+	case PMU_BATT_TYPE_SMART:
+		return pmu_batt_types[0];
+	case PMU_BATT_TYPE_COMET:
+		return pmu_batt_types[1];
+	case PMU_BATT_TYPE_HOOPER:
+		return pmu_batt_types[2];
+	default: break;
+	}
+	return pmu_batt_types[3];
+}
+
+static int pmu_bat_get_property(struct power_supply *psy,
+				enum power_supply_property psp,
+				union power_supply_propval *val)
+{
+	struct pmu_battery_dev *pbat = to_pmu_battery_dev(psy);
+	struct pmu_battery_info *pbi = pbat->pbi;
+
+	switch (psp) {
+	case POWER_SUPPLY_PROP_STATUS:
+		if (pbi->flags & PMU_BATT_CHARGING)
+			val->intval = POWER_SUPPLY_STATUS_CHARGING;
+		else
+			val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
+		break;
+	case POWER_SUPPLY_PROP_PRESENT:
+		val->intval = !!(pbi->flags & PMU_BATT_PRESENT);
+		break;
+	case POWER_SUPPLY_PROP_MODEL_NAME:
+		val->strval = pmu_bat_get_model_name(pbi);
+		break;
+	case POWER_SUPPLY_PROP_ENERGY_AVG:
+		val->intval = pbi->charge     * 1000; /* mWh -> µWh */
+		break;
+	case POWER_SUPPLY_PROP_ENERGY_FULL:
+		val->intval = pbi->max_charge * 1000; /* mWh -> µWh */
+		break;
+	case POWER_SUPPLY_PROP_CURRENT_AVG:
+		val->intval = pbi->amperage   * 1000; /* mA -> µA */
+		break;
+	case POWER_SUPPLY_PROP_VOLTAGE_AVG:
+		val->intval = pbi->voltage    * 1000; /* mV -> µV */
+		break;
+	case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG:
+		val->intval = pbi->time_remaining;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static enum power_supply_property pmu_bat_props[] = {
+	POWER_SUPPLY_PROP_STATUS,
+	POWER_SUPPLY_PROP_PRESENT,
+	POWER_SUPPLY_PROP_MODEL_NAME,
+	POWER_SUPPLY_PROP_ENERGY_AVG,
+	POWER_SUPPLY_PROP_ENERGY_FULL,
+	POWER_SUPPLY_PROP_CURRENT_AVG,
+	POWER_SUPPLY_PROP_VOLTAGE_AVG,
+	POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG,
+};
+
+/*********************************************************************
+ *		Initialisation
+ *********************************************************************/
+
+static struct platform_device *bat_pdev;
+
+static int __init pmu_bat_init(void)
+{
+	int ret;
+	int i;
+
+	bat_pdev = platform_device_register_simple("pmu-battery",
+						   0, NULL, 0);
+	if (IS_ERR(bat_pdev)) {
+		ret = PTR_ERR(bat_pdev);
+		goto pdev_register_failed;
+	}
+
+	ret = power_supply_register(&bat_pdev->dev, &pmu_ac);
+	if (ret)
+		goto ac_register_failed;
+
+	for (i = 0; i < pmu_battery_count; i++) {
+		struct pmu_battery_dev *pbat = kzalloc(sizeof(*pbat),
+						       GFP_KERNEL);
+		if (!pbat)
+			break;
+
+		sprintf(pbat->name, "PMU battery %d", i);
+		pbat->bat.name = pbat->name;
+		pbat->bat.properties = pmu_bat_props;
+		pbat->bat.num_properties = ARRAY_SIZE(pmu_bat_props);
+		pbat->bat.get_property = pmu_bat_get_property;
+		pbat->pbi = &pmu_batteries[i];
+
+		ret = power_supply_register(&bat_pdev->dev, &pbat->bat);
+		if (ret) {
+			kfree(pbat);
+			goto battery_register_failed;
+		}
+		pbats[i] = pbat;
+	}
+
+	goto success;
+
+battery_register_failed:
+	while (i--) {
+		if (!pbats[i])
+			continue;
+		power_supply_unregister(&pbats[i]->bat);
+		kfree(pbats[i]);
+	}
+	power_supply_unregister(&pmu_ac);
+ac_register_failed:
+	platform_device_unregister(bat_pdev);
+pdev_register_failed:
+success:
+	return ret;
+}
+
+static void __exit pmu_bat_exit(void)
+{
+	int i;
+
+	for (i = 0; i < PMU_MAX_BATTERIES; i++) {
+		if (!pbats[i])
+			continue;
+		power_supply_unregister(&pbats[i]->bat);
+		kfree(pbats[i]);
+	}
+	power_supply_unregister(&pmu_ac);
+	platform_device_unregister(bat_pdev);
+
+	return;
+}
+
+module_init(pmu_bat_init);
+module_exit(pmu_bat_exit);
+
+MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("PMU battery driver");

drivers/power/power_supply.h

+/*
+ *  Functions private to power supply class
+ *
+ *  Copyright © 2007  Anton Vorontsov <cbou@mail.ru>
+ *  Copyright © 2004  Szabolcs Gyurko
+ *  Copyright © 2003  Ian Molton <spyro@f2s.com>
+ *
+ *  Modified: 2004, Oct     Szabolcs Gyurko
+ *
+ *  You may use this code as per GPL version 2
+ */
+
+#ifdef CONFIG_SYSFS
+
+extern int power_supply_create_attrs(struct power_supply *psy);
+extern void power_supply_remove_attrs(struct power_supply *psy);
+extern int power_supply_uevent(struct device *dev, char **envp, int num_envp,
+			       char *buffer, int buffer_size);
+
+#else
+
+static inline int power_supply_create_attrs(struct power_supply *psy)
+{ return 0; }
+static inline void power_supply_remove_attrs(struct power_supply *psy) {}
+#define power_supply_uevent NULL
+
+#endif /* CONFIG_SYSFS */
+
+#ifdef CONFIG_LEDS_TRIGGERS
+
+extern void power_supply_update_leds(struct power_supply *psy);
+extern int power_supply_create_triggers(struct power_supply *psy);
+extern void power_supply_remove_triggers(struct power_supply *psy);
+
+#else
+
+static inline void power_supply_update_leds(struct power_supply *psy) {}
+static inline int power_supply_create_triggers(struct power_supply *psy)
+{ return 0; }
+static inline void power_supply_remove_triggers(struct power_supply *psy) {}
+
+#endif /* CONFIG_LEDS_TRIGGERS */

drivers/power/power_supply_core.c

+/*
+ *  Universal power supply monitor class
+ *
+ *  Copyright © 2007  Anton Vorontsov <cbou@mail.ru>
+ *  Copyright © 2004  Szabolcs Gyurko
+ *  Copyright © 2003  Ian Molton <spyro@f2s.com>
+ *
+ *  Modified: 2004, Oct     Szabolcs Gyurko
+ *
+ *  You may use this code as per GPL version 2
+ */
+
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/init.h>
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/power_supply.h>
+#include "power_supply.h"
+
+struct class *power_supply_class;
+
+static void power_supply_changed_work(struct work_struct *work)
+{
+	struct power_supply *psy = container_of(work, struct power_supply,
+						changed_work);
+	int i;
+
+	dev_dbg(psy->dev, "%s\n", __FUNCTION__);
+
+	for (i = 0; i < psy->num_supplicants; i++) {
+		struct device *dev;
+
+		down(&power_supply_class->sem);
+		list_for_each_entry(dev, &power_supply_class->devices, node) {
+			struct power_supply *pst = dev_get_drvdata(dev);
+
+			if (!strcmp(psy->supplied_to[i], pst->name)) {
+				if (pst->external_power_changed)
+					pst->external_power_changed(pst);
+			}
+		}
+		up(&power_supply_class->sem);
+	}
+
+	power_supply_update_leds(psy);
+
+	kobject_uevent(&psy->dev->kobj, KOBJ_CHANGE);
+
+	return;
+}
+
+void power_supply_changed(struct power_supply *psy)
+{
+	dev_dbg(psy->dev, "%s\n", __FUNCTION__);
+
+	schedule_work(&psy->changed_work);
+
+	return;
+}
+
+int power_supply_am_i_supplied(struct power_supply *psy)
+{
+	union power_supply_propval ret = {0,};
+	struct device *dev;
+
+	down(&power_supply_class->sem);
+	list_for_each_entry(dev, &power_supply_class->devices, node) {
+		struct power_supply *epsy = dev_get_drvdata(dev);
+		int i;
+
+		for (i = 0; i < epsy->num_supplicants; i++) {
+			if (!strcmp(epsy->supplied_to[i], psy->name)) {
+				if (epsy->get_property(epsy,
+					  POWER_SUPPLY_PROP_ONLINE, &ret))
+					continue;
+				if (ret.intval)
+					goto out;
+			}
+		}
+	}
+out:
+	up(&power_supply_class->sem);
+
+	dev_dbg(psy->dev, "%s %d\n", __FUNCTION__, ret.intval);
+
+	return ret.intval;
+}
+
+int power_supply_register(struct device *parent, struct power_supply *psy)
+{
+	int rc = 0;
+
+	psy->dev = device_create(power_supply_class, parent, 0,
+				 "%s", psy->name);
+	if (IS_ERR(psy->dev)) {
+		rc = PTR_ERR(psy->dev);
+		goto dev_create_failed;
+	}
+
+	dev_set_drvdata(psy->dev, psy);
+
+	INIT_WORK(&psy->changed_work, power_supply_changed_work);
+
+	rc = power_supply_create_attrs(psy);
+	if (rc)
+		goto create_attrs_failed;
+
+	rc = power_supply_create_triggers(psy);
+	if (rc)
+		goto create_triggers_failed;
+
+	power_supply_changed(psy);
+
+	goto success;
+
+create_triggers_failed:
+	power_supply_remove_attrs(psy);
+create_attrs_failed:
+	device_unregister(psy->dev);
+dev_create_failed:
+success:
+	return rc;
+}
+
+void power_supply_unregister(struct power_supply *psy)
+{
+	flush_scheduled_work();
+	power_supply_remove_triggers(psy);
+	power_supply_remove_attrs(psy);
+	device_unregister(psy->dev);
+	return;
+}
+
+static int __init power_supply_class_init(void)
+{
+	power_supply_class = class_create(THIS_MODULE, "power_supply");
+
+	if (IS_ERR(power_supply_class))
+		return PTR_ERR(power_supply_class);
+
+	power_supply_class->dev_uevent = power_supply_uevent;
+
+	return 0;
+}
+
+static void __exit power_supply_class_exit(void)
+{
+	class_destroy(power_supply_class);
+	return;
+}
+
+EXPORT_SYMBOL_GPL(power_supply_changed);
+EXPORT_SYMBOL_GPL(power_supply_am_i_supplied);
+EXPORT_SYMBOL_GPL(power_supply_register);
+EXPORT_SYMBOL_GPL(power_supply_unregister);
+
+/* exported for the APM Power driver, APM emulation */
+EXPORT_SYMBOL_GPL(power_supply_class);
+
+subsys_initcall(power_supply_class_init);
+module_exit(power_supply_class_exit);
+
+MODULE_DESCRIPTION("Universal power supply monitor class");
+MODULE_AUTHOR("Ian Molton <spyro@f2s.com>, "
+	      "Szabolcs Gyurko, "
+	      "Anton Vorontsov <cbou@mail.ru>");
+MODULE_LICENSE("GPL");

drivers/power/power_supply_leds.c

+/*
+ *  LEDs triggers for power supply class
+ *
+ *  Copyright © 2007  Anton Vorontsov <cbou@mail.ru>
+ *  Copyright © 2004  Szabolcs Gyurko
+ *  Copyright © 2003  Ian Molton <spyro@f2s.com>
+ *
+ *  Modified: 2004, Oct     Szabolcs Gyurko
+ *
+ *  You may use this code as per GPL version 2
+ */
+
+#include <linux/power_supply.h>
+
+/* Battery specific LEDs triggers. */
+
+static void power_supply_update_bat_leds(struct power_supply *psy)
+{
+	union power_supply_propval status;
+
+	if (psy->get_property(psy, POWER_SUPPLY_PROP_STATUS, &status))
+		return;
+
+	dev_dbg(psy->dev, "%s %d\n", __FUNCTION__, status.intval);
+
+	switch (status.intval) {
+	case POWER_SUPPLY_STATUS_FULL:
+		led_trigger_event(psy->charging_full_trig, LED_FULL);
+		led_trigger_event(psy->charging_trig, LED_OFF);
+		led_trigger_event(psy->full_trig, LED_FULL);
+		break;
+	case POWER_SUPPLY_STATUS_CHARGING:
+		led_trigger_event(psy->charging_full_trig, LED_FULL);
+		led_trigger_event(psy->charging_trig, LED_FULL);
+		led_trigger_event(psy->full_trig, LED_OFF);
+		break;
+	default:
+		led_trigger_event(psy->charging_full_trig, LED_OFF);
+		led_trigger_event(psy->charging_trig, LED_OFF);
+		led_trigger_event(psy->full_trig, LED_OFF);
+		break;
+	}
+
+	return;
+}
+
+static int power_supply_create_bat_triggers(struct power_supply *psy)
+{
+	int rc = 0;
+
+	psy->charging_full_trig_name = kmalloc(strlen(psy->name) +
+				  sizeof("-charging-or-full"), GFP_KERNEL);
+	if (!psy->charging_full_trig_name)
+		goto charging_full_failed;
+
+	psy->charging_trig_name = kmalloc(strlen(psy->name) +
+					  sizeof("-charging"), GFP_KERNEL);
+	if (!psy->charging_trig_name)
+		goto charging_failed;
+
+	psy->full_trig_name = kmalloc(strlen(psy->name) +
+				      sizeof("-full"), GFP_KERNEL);
+	if (!psy->full_trig_name)
+		goto full_failed;
+
+	strcpy(psy->charging_full_trig_name, psy->name);
+	strcat(psy->charging_full_trig_name, "-charging-or-full");
+	strcpy(psy->charging_trig_name, psy->name);
+	strcat(psy->charging_trig_name, "-charging");
+	strcpy(psy->full_trig_name, psy->name);
+	strcat(psy->full_trig_name, "-full");
+
+	led_trigger_register_simple(psy->charging_full_trig_name,
+				    &psy->charging_full_trig);
+	led_trigger_register_simple(psy->charging_trig_name,
+				    &psy->charging_trig);
+	led_trigger_register_simple(psy->full_trig_name,
+				    &psy->full_trig);
+
+	goto success;
+
+full_failed:
+	kfree(psy->charging_trig_name);
+charging_failed:
+	kfree(psy->charging_full_trig_name);
+charging_full_failed:
+	rc = -ENOMEM;
+success:
+	return rc;
+}
+
+static void power_supply_remove_bat_triggers(struct power_supply *psy)
+{
+	led_trigger_unregister_simple(psy->charging_full_trig);
+	led_trigger_unregister_simple(psy->charging_trig);
+	led_trigger_unregister_simple(psy->full_trig);
+	kfree(psy->full_trig_name);
+	kfree(psy->charging_trig_name);
+	kfree(psy->charging_full_trig_name);
+	return;
+}
+
+/* Generated power specific LEDs triggers. */
+
+static void power_supply_update_gen_leds(struct power_supply *psy)
+{
+	union power_supply_propval online;
+
+	if (psy->get_property(psy, POWER_SUPPLY_PROP_ONLINE, &online))
+		return;
+
+	dev_dbg(psy->dev, "%s %d\n", __FUNCTION__, online.intval);
+
+	if (online.intval)
+		led_trigger_event(psy->online_trig, LED_FULL);
+	else
+		led_trigger_event(psy->online_trig, LED_OFF);
+
+	return;
+}
+
+static int power_supply_create_gen_triggers(struct power_supply *psy)
+{
+	int rc = 0;
+
+	psy->online_trig_name = kmalloc(strlen(psy->name) + sizeof("-online"),
+					GFP_KERNEL);
+	if (!psy->online_trig_name)
+		goto online_failed;
+
+	strcpy(psy->online_trig_name, psy->name);
+	strcat(psy->online_trig_name, "-online");
+
+	led_trigger_register_simple(psy->online_trig_name, &psy->online_trig);
+
+	goto success;
+
+online_failed:
+	rc = -ENOMEM;
+success:
+	return rc;
+}
+
+static void power_supply_remove_gen_triggers(struct power_supply *psy)
+{
+	led_trigger_unregister_simple(psy->online_trig);
+	kfree(psy->online_trig_name);
+	return;
+}
+
+/* Choice what triggers to create&update. */
+
+void power_supply_update_leds(struct power_supply *psy)
+{
+	if (psy->type == POWER_SUPPLY_TYPE_BATTERY)
+		power_supply_update_bat_leds(psy);
+	else
+		power_supply_update_gen_leds(psy);
+	return;
+}
+
+int power_supply_create_triggers(struct power_supply *psy)
+{
+	if (psy->type == POWER_SUPPLY_TYPE_BATTERY)
+		return power_supply_create_bat_triggers(psy);
+	return power_supply_create_gen_triggers(psy);
+}
+
+void power_supply_remove_triggers(struct power_supply *psy)
+{
+	if (psy->type == POWER_SUPPLY_TYPE_BATTERY)
+		power_supply_remove_bat_triggers(psy);
+	else
+		power_supply_remove_gen_triggers(psy);
+	return;
+}

drivers/power/power_supply_sysfs.c

+/*
+ *  Sysfs interface for the universal power supply monitor class
+ *
+ *  Copyright © 2007  David Woodhouse <dwmw2@infradead.org>
+ *  Copyright © 2007  Anton Vorontsov <cbou@mail.ru>
+ *  Copyright © 2004  Szabolcs Gyurko
+ *  Copyright © 2003  Ian Molton <spyro@f2s.com>
+ *
+ *  Modified: 2004, Oct     Szabolcs Gyurko
+ *
+ *  You may use this code as per GPL version 2
+ */
+
+#include <linux/ctype.h>
+#include <linux/power_supply.h>
+
+/*
+ * This is because the name "current" breaks the device attr macro.
+ * The "current" word resolves to "(get_current())" so instead of
+ * "current" "(get_current())" appears in the sysfs.
+ *
+ * The source of this definition is the device.h which calls __ATTR
+ * macro in sysfs.h which calls the __stringify macro.
+ *
+ * Only modification that the name is not tried to be resolved
+ * (as a macro let's say).
+ */
+
+#define POWER_SUPPLY_ATTR(_name)					\
+{									\
+	.attr = { .name = #_name, .mode = 0444, .owner = THIS_MODULE },	\
+	.show = power_supply_show_property,				\
+	.store = NULL,							\
+}
+
+static struct device_attribute power_supply_attrs[];
+
+static ssize_t power_supply_show_property(struct device *dev,
+					  struct device_attribute *attr,
+					  char *buf) {
+	static char *status_text[] = {
+		"Unknown", "Charging", "Discharging", "Not charging", "Full"
+	};
+	static char *health_text[] = {
+		"Unknown", "Good", "Overheat", "Dead", "Over voltage",
+		"Unspecified failure"
+	};
+	static char *technology_text[] = {
+		"Unknown", "NiMH", "Li-ion", "Li-poly", "LiFe", "NiCd"
+	};
+	static char *capacity_level_text[] = {
+		"Unknown", "Critical", "Low", "Normal", "High", "Full"
+	};
+	ssize_t ret;
+	struct power_supply *psy = dev_get_drvdata(dev);
+	const ptrdiff_t off = attr - power_supply_attrs;
+	union power_supply_propval value;
+
+	ret = psy->get_property(psy, off, &value);
+
+	if (ret < 0) {
+		if (ret != -ENODEV)
+			dev_err(dev, "driver failed to report `%s' property\n",
+				attr->attr.name);
+		return ret;
+	}
+
+	if (off == POWER_SUPPLY_PROP_STATUS)
+		return sprintf(buf, "%s\n", status_text[value.intval]);
+	else if (off == POWER_SUPPLY_PROP_HEALTH)
+		return sprintf(buf, "%s\n", health_text[value.intval]);
+	else if (off == POWER_SUPPLY_PROP_TECHNOLOGY)
+		return sprintf(buf, "%s\n", technology_text[value.intval]);
+	else if (off == POWER_SUPPLY_PROP_CAPACITY_LEVEL)
+		return sprintf(buf, "%s\n",
+			       capacity_level_text[value.intval]);
+	else if (off >= POWER_SUPPLY_PROP_MODEL_NAME)
+		return sprintf(buf, "%s\n", value.strval);
+
+	return sprintf(buf, "%d\n", value.intval);
+}
+
+/* Must be in the same order as POWER_SUPPLY_PROP_* */
+static struct device_attribute power_supply_attrs[] = {
+	/* Properties of type `int' */
+	POWER_SUPPLY_ATTR(status),
+	POWER_SUPPLY_ATTR(health),
+	POWER_SUPPLY_ATTR(present),
+	POWER_SUPPLY_ATTR(online),
+	POWER_SUPPLY_ATTR(technology),
+	POWER_SUPPLY_ATTR(voltage_max_design),
+	POWER_SUPPLY_ATTR(voltage_min_design),
+	POWER_SUPPLY_ATTR(voltage_now),
+	POWER_SUPPLY_ATTR(voltage_avg),
+	POWER_SUPPLY_ATTR(current_now),
+	POWER_SUPPLY_ATTR(current_avg),
+	POWER_SUPPLY_ATTR(charge_full_design),
+	POWER_SUPPLY_ATTR(charge_empty_design),
+	POWER_SUPPLY_ATTR(charge_full),
+	POWER_SUPPLY_ATTR(charge_empty),
+	POWER_SUPPLY_ATTR(charge_now),
+	POWER_SUPPLY_ATTR(charge_avg),
+	POWER_SUPPLY_ATTR(energy_full_design),
+	POWER_SUPPLY_ATTR(energy_empty_design),
+	POWER_SUPPLY_ATTR(energy_full),
+	POWER_SUPPLY_ATTR(energy_empty),
+	POWER_SUPPLY_ATTR(energy_now),
+	POWER_SUPPLY_ATTR(energy_avg),
+	POWER_SUPPLY_ATTR(capacity),
+	POWER_SUPPLY_ATTR(capacity_level),
+	POWER_SUPPLY_ATTR(temp),
+	POWER_SUPPLY_ATTR(temp_ambient),
+	POWER_SUPPLY_ATTR(time_to_empty_now),
+	POWER_SUPPLY_ATTR(time_to_empty_avg),
+	POWER_SUPPLY_ATTR(time_to_full_now),
+	POWER_SUPPLY_ATTR(time_to_full_avg),
+	/* Properties of type `const char *' */
+	POWER_SUPPLY_ATTR(model_name),
+	POWER_SUPPLY_ATTR(manufacturer),
+};
+
+static ssize_t power_supply_show_static_attrs(struct device *dev,
+					      struct device_attribute *attr,
+					      char *buf) {
+	static char *type_text[] = { "Battery", "UPS", "Mains", "USB" };
+	struct power_supply *psy = dev_get_drvdata(dev);
+
+	return sprintf(buf, "%s\n", type_text[psy->type]);
+}
+
+static struct device_attribute power_supply_static_attrs[] = {
+	__ATTR(type, 0444, power_supply_show_static_attrs, NULL),
+};
+
+int power_supply_create_attrs(struct power_supply *psy)
+{
+	int rc = 0;
+	int i, j;
+
+	for (i = 0; i < ARRAY_SIZE(power_supply_static_attrs); i++) {
+		rc = device_create_file(psy->dev,
+			    &power_supply_static_attrs[i]);
+		if (rc)
+			goto statics_failed;
+	}
+
+	for (j = 0; j < psy->num_properties; j++) {
+		rc = device_create_file(psy->dev,
+			    &power_supply_attrs[psy->properties[j]]);
+		if (rc)
+			goto dynamics_failed;
+	}
+
+	goto succeed;
+
+dynamics_failed:
+	while (j--)
+		device_remove_file(psy->dev,
+			   &power_supply_attrs[psy->properties[j]]);
+statics_failed:
+	while (i--)
+		device_remove_file(psy->dev,
+			   &power_supply_static_attrs[psy->properties[i]]);
+succeed:
+	return rc;
+}
+
+void power_supply_remove_attrs(struct power_supply *psy)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(power_supply_static_attrs); i++)
+		device_remove_file(psy->dev,
+			    &power_supply_static_attrs[i]);
+
+	for (i = 0; i < psy->num_properties; i++)
+		device_remove_file(psy->dev,
+			    &power_supply_attrs[psy->properties[i]]);
+
+	return;
+}
+
+static char *kstruprdup(const char *str, gfp_t gfp)
+{
+	char *ret, *ustr;
+
+	ustr = ret = kmalloc(strlen(str) + 1, gfp);
+
+	if (!ret)
+		return NULL;
+
+	while (*str)
+		*ustr++ = toupper(*str++);
+
+	*ustr = 0;
+
+	return ret;
+}
+
+int power_supply_uevent(struct device *dev, char **envp, int num_envp,
+			char *buffer, int buffer_size)
+{
+	struct power_supply *psy = dev_get_drvdata(dev);
+	int i = 0, length = 0, ret = 0, j;
+	char *prop_buf;
+	char *attrname;
+
+	dev_dbg(dev, "uevent\n");
+
+	if (!psy) {
+		dev_dbg(dev, "No power supply yet\n");
+		return ret;
+	}
+
+	dev_dbg(dev, "POWER_SUPPLY_NAME=%s\n", psy->name);
+
+	ret = add_uevent_var(envp, num_envp, &i, buffer, buffer_size,
+			     &length, "POWER_SUPPLY_NAME=%s", psy->name);
+	if (ret)
+		return ret;
+
+	prop_buf = (char *)get_zeroed_page(GFP_KERNEL);
+	if (!prop_buf)
+		return -ENOMEM;
+
+	for (j = 0; j < ARRAY_SIZE(power_supply_static_attrs); j++) {
+		struct device_attribute *attr;
+		char *line;
+
+		attr = &power_supply_static_attrs[j];
+
+		ret = power_supply_show_static_attrs(dev, attr, prop_buf);
+		if (ret < 0)
+			goto out;
+
+		line = strchr(prop_buf, '\n');
+		if (line)
+			*line = 0;
+
+		attrname = kstruprdup(attr->attr.name, GFP_KERNEL);
+		if (!attrname) {
+			ret = -ENOMEM;
+			goto out;
+		}
+
+		dev_dbg(dev, "Static prop %s=%s\n", attrname, prop_buf);
+
+		ret = add_uevent_var(envp, num_envp, &i, buffer, buffer_size,
+				     &length, "POWER_SUPPLY_%s=%s",
+				     attrname, prop_buf);
+		kfree(attrname);
+		if (ret)
+			goto out;
+	}
+
+	dev_dbg(dev, "%zd dynamic props\n", psy->num_properties);
+
+	for (j = 0; j < psy->num_properties; j++) {
+		struct device_attribute *attr;
+		char *line;
+
+		attr = &power_supply_attrs[psy->properties[j]];
+
+		ret = power_supply_show_property(dev, attr, prop_buf);
+		if (ret == -ENODEV) {
+			/* When a battery is absent, we expect -ENODEV. Don't abort;
+			   send the uevent with at least the the PRESENT=0 property */
+			ret = 0;
+			continue;
+		}
+
+		if (ret < 0)
+			goto out;
+
+		line = strchr(prop_buf, '\n');
+		if (line)
+			*line = 0;
+
+		attrname = kstruprdup(attr->attr.name, GFP_KERNEL);
+		if (!attrname) {
+			ret = -ENOMEM;
+			goto out;
+		}
+
+		dev_dbg(dev, "prop %s=%s\n", attrname, prop_buf);
+
+		ret = add_uevent_var(envp, num_envp, &i, buffer, buffer_size,
+				     &length, "POWER_SUPPLY_%s=%s",
+				     attrname, prop_buf);
+		kfree(attrname);
+		if (ret)
+			goto out;
+	}
+
+out:
+	free_page((unsigned long)prop_buf);
+
+	return ret;
+}

drivers/w1/slaves/Kconfig

@@ -35,4 +35,17 @@ config W1_SLAVE_DS2433_CRC
 	  Each block has 30 bytes of data and a two byte CRC16.
 	  Full block writes are only allowed if the CRC is valid.
 
+config W1_SLAVE_DS2760
+	tristate "Dallas 2760 battery monitor chip (HP iPAQ & others)"
+	depends on W1
+	help
+	  If you enable this you will have the DS2760 battery monitor
+	  chip support.
+
+	  The battery monitor chip is used in many batteries/devices
+	  as the one who is responsible for charging/discharging/monitoring
+	  Li+ batteries.
+
+	  If you are unsure, say N.
+
 endmenu

drivers/w1/slaves/Makefile

@@ -5,4 +5,5 @@
 obj-$(CONFIG_W1_SLAVE_THERM)	+= w1_therm.o
 obj-$(CONFIG_W1_SLAVE_SMEM)	+= w1_smem.o
 obj-$(CONFIG_W1_SLAVE_DS2433)	+= w1_ds2433.o
+obj-$(CONFIG_W1_SLAVE_DS2760)	+= w1_ds2760.o
 

drivers/w1/slaves/w1_ds2760.c

+/*
+ * 1-Wire implementation for the ds2760 chip
+ *
+ * Copyright © 2004-2005, Szabolcs Gyurko <szabolcs.gyurko@tlt.hu>
+ *
+ * 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/kernel.h>
+#include <linux/module.h>
+#include <linux/device.h>
+#include <linux/types.h>
+#include <linux/platform_device.h>
+#include <linux/mutex.h>
+#include <linux/idr.h>
+
+#include "../w1.h"
+#include "../w1_int.h"
+#include "../w1_family.h"
+#include "w1_ds2760.h"
+
+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->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->mutex);
+
+	return count;
+}
+
+int w1_ds2760_read(struct device *dev, char *buf, int addr, size_t count)
+{
+	return w1_ds2760_io(dev, buf, addr, count, 0);
+}
+
+int w1_ds2760_write(struct device *dev, char *buf, int addr, size_t count)
+{
+	return w1_ds2760_io(dev, buf, addr, count, 1);
+}
+
+static ssize_t w1_ds2760_read_bin(struct kobject *kobj, 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 struct bin_attribute w1_ds2760_bin_attr = {
+	.attr = {
+		.name = "w1_slave",
+		.mode = S_IRUGO,
+		.owner = THIS_MODULE,
+	},
+	.size = DS2760_DATA_SIZE,
+	.read = w1_ds2760_read_bin,
+};
+
+static DEFINE_IDR(bat_idr);
+static DEFINE_MUTEX(bat_idr_lock);
+
+static int new_bat_id(void)
+{
+	int ret;
+
+	while (1) {
+		int id;
+
+		ret = idr_pre_get(&bat_idr, GFP_KERNEL);
+		if (ret == 0)
+			return -ENOMEM;
+
+		mutex_lock(&bat_idr_lock);
+		ret = idr_get_new(&bat_idr, NULL, &id);
+		mutex_unlock(&bat_idr_lock);
+
+		if (ret == 0) {
+			ret = id & MAX_ID_MASK;
+			break;
+		} else if (ret == -EAGAIN) {
+			continue;
+		} else {
+			break;
+		}
+	}
+
+	return ret;
+}
+
+static void release_bat_id(int id)
+{
+	mutex_lock(&bat_idr_lock);
+	idr_remove(&bat_idr, id);
+	mutex_unlock(&bat_idr_lock);
+
+	return;
+}
+
+static int w1_ds2760_add_slave(struct w1_slave *sl)
+{
+	int ret;
+	int id;
+	struct platform_device *pdev;
+
+	id = new_bat_id();
+	if (id < 0) {
+		ret = id;
+		goto noid;
+	}
+
+	pdev = platform_device_alloc("ds2760-battery", id);
+	if (!pdev) {
+		ret = -ENOMEM;
+		goto pdev_alloc_failed;
+	}
+	pdev->dev.parent = &sl->dev;
+
+	ret = platform_device_add(pdev);
+	if (ret)
+		goto pdev_add_failed;
+
+	ret = sysfs_create_bin_file(&sl->dev.kobj, &w1_ds2760_bin_attr);
+	if (ret)
+		goto bin_attr_failed;
+
+	dev_set_drvdata(&sl->dev, pdev);
+
+	goto success;
+
+bin_attr_failed:
+pdev_add_failed:
+	platform_device_unregister(pdev);
+pdev_alloc_failed:
+	release_bat_id(id);
+noid:
+success:
+	return ret;
+}
+
+static void w1_ds2760_remove_slave(struct w1_slave *sl)
+{
+	struct platform_device *pdev = dev_get_drvdata(&sl->dev);
+	int id = pdev->id;
+
+	platform_device_unregister(pdev);
+	release_bat_id(id);
+	sysfs_remove_bin_file(&sl->dev.kobj, &w1_ds2760_bin_attr);
+
+	return;
+}
+
+static struct w1_family_ops w1_ds2760_fops = {
+	.add_slave    = w1_ds2760_add_slave,
+	.remove_slave = w1_ds2760_remove_slave,
+};
+
+static struct w1_family w1_ds2760_family = {
+	.fid = W1_FAMILY_DS2760,
+	.fops = &w1_ds2760_fops,
+};
+
+static int __init w1_ds2760_init(void)
+{
+	printk(KERN_INFO "1-Wire driver for the DS2760 battery monitor "
+	       " chip  - (c) 2004-2005, Szabolcs Gyurko\n");
+	idr_init(&bat_idr);
+	return w1_register_family(&w1_ds2760_family);
+}
+
+static void __exit w1_ds2760_exit(void)
+{
+	w1_unregister_family(&w1_ds2760_family);
+	idr_destroy(&bat_idr);
+}
+
+EXPORT_SYMBOL(w1_ds2760_read);
+EXPORT_SYMBOL(w1_ds2760_write);
+
+module_init(w1_ds2760_init);
+module_exit(w1_ds2760_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Szabolcs Gyurko <szabolcs.gyurko@tlt.hu>");
+MODULE_DESCRIPTION("1-wire Driver Dallas 2760 battery monitor chip");

drivers/w1/slaves/w1_ds2760.h

+/*
+ * 1-Wire implementation for the ds2760 chip
+ *
+ * Copyright © 2004-2005, Szabolcs Gyurko <szabolcs.gyurko@tlt.hu>
+ *
+ * Use consistent with the GNU GPL is permitted,
+ * provided that this copyright notice is
+ * preserved in its entirety in all copies and derived works.
+ *
+ */
+
+#ifndef __w1_ds2760_h__
+#define __w1_ds2760_h__
+
+/* 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_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_RATED_CAPACITY		0x32
+#define DS2760_CURRENT_OFFSET_BIAS	0x33
+#define DS2760_ACTIVE_EMPTY		0x3b
+
+extern int w1_ds2760_read(struct device *dev, char *buf, int addr,
+			  size_t count);
+extern int w1_ds2760_write(struct device *dev, char *buf, int addr,
+			   size_t count);
+
+#endif /* !__w1_ds2760_h__ */

drivers/w1/w1_family.h

@@ -33,6 +33,7 @@
 #define W1_THERM_DS1822  	0x22
 #define W1_EEPROM_DS2433  	0x23
 #define W1_THERM_DS18B20 	0x28
+#define W1_FAMILY_DS2760	0x30
 
 #define MAXNAMELEN		32
 

include/linux/pda_power.h

+/*
+ * Common power driver for PDAs and phones with one or two external
+ * power supplies (AC/USB) connected to main and backup batteries,
+ * and optional builtin charger.
+ *
+ * Copyright © 2007 Anton Vorontsov <cbou@mail.ru>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#ifndef __PDA_POWER_H__
+#define __PDA_POWER_H__
+
+#define PDA_POWER_CHARGE_AC  (1 << 0)
+#define PDA_POWER_CHARGE_USB (1 << 1)
+
+struct pda_power_pdata {
+	int (*is_ac_online)(void);
+	int (*is_usb_online)(void);
+	void (*set_charge)(int flags);
+
+	char **supplied_to;
+	size_t num_supplicants;
+
+	unsigned int wait_for_status; /* msecs, default is 500 */
+	unsigned int wait_for_charger; /* msecs, default is 500 */
+};
+
+#endif /* __PDA_POWER_H__ */

include/linux/power_supply.h

+/*
+ *  Universal power supply monitor class
+ *
+ *  Copyright © 2007  Anton Vorontsov <cbou@mail.ru>
+ *  Copyright © 2004  Szabolcs Gyurko
+ *  Copyright © 2003  Ian Molton <spyro@f2s.com>
+ *
+ *  Modified: 2004, Oct     Szabolcs Gyurko
+ *
+ *  You may use this code as per GPL version 2
+ */
+
+#ifndef __LINUX_POWER_SUPPLY_H__
+#define __LINUX_POWER_SUPPLY_H__
+
+#include <linux/device.h>
+#include <linux/workqueue.h>
+#include <linux/leds.h>
+
+/*
+ * All voltages, currents, charges, energies, time and temperatures in uV,
+ * µA, µAh, µWh, seconds and tenths of degree Celsius unless otherwise
+ * stated. It's driver's job to convert its raw values to units in which
+ * this class operates.
+ */
+
+/*
+ * For systems where the charger determines the maximum battery capacity
+ * the min and max fields should be used to present these values to user
+ * space. Unused/unknown fields will not appear in sysfs.
+ */
+
+enum {
+	POWER_SUPPLY_STATUS_UNKNOWN = 0,
+	POWER_SUPPLY_STATUS_CHARGING,
+	POWER_SUPPLY_STATUS_DISCHARGING,
+	POWER_SUPPLY_STATUS_NOT_CHARGING,
+	POWER_SUPPLY_STATUS_FULL,
+};
+
+enum {
+	POWER_SUPPLY_HEALTH_UNKNOWN = 0,
+	POWER_SUPPLY_HEALTH_GOOD,
+	POWER_SUPPLY_HEALTH_OVERHEAT,
+	POWER_SUPPLY_HEALTH_DEAD,
+	POWER_SUPPLY_HEALTH_OVERVOLTAGE,
+	POWER_SUPPLY_HEALTH_UNSPEC_FAILURE,
+};
+
+enum {
+	POWER_SUPPLY_TECHNOLOGY_UNKNOWN = 0,
+	POWER_SUPPLY_TECHNOLOGY_NiMH,
+	POWER_SUPPLY_TECHNOLOGY_LION,
+	POWER_SUPPLY_TECHNOLOGY_LIPO,
+	POWER_SUPPLY_TECHNOLOGY_LiFe,
+	POWER_SUPPLY_TECHNOLOGY_NiCd,
+};
+
+enum {
+	POWER_SUPPLY_CAPACITY_LEVEL_UNKNOWN = 0,
+	POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL,
+	POWER_SUPPLY_CAPACITY_LEVEL_LOW,
+	POWER_SUPPLY_CAPACITY_LEVEL_NORMAL,
+	POWER_SUPPLY_CAPACITY_LEVEL_HIGH,
+	POWER_SUPPLY_CAPACITY_LEVEL_FULL,
+};
+
+enum power_supply_property {
+	/* Properties of type `int' */
+	POWER_SUPPLY_PROP_STATUS = 0,
+	POWER_SUPPLY_PROP_HEALTH,
+	POWER_SUPPLY_PROP_PRESENT,
+	POWER_SUPPLY_PROP_ONLINE,
+	POWER_SUPPLY_PROP_TECHNOLOGY,
+	POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
+	POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
+	POWER_SUPPLY_PROP_VOLTAGE_NOW,
+	POWER_SUPPLY_PROP_VOLTAGE_AVG,
+	POWER_SUPPLY_PROP_CURRENT_NOW,
+	POWER_SUPPLY_PROP_CURRENT_AVG,
+	POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
+	POWER_SUPPLY_PROP_CHARGE_EMPTY_DESIGN,
+	POWER_SUPPLY_PROP_CHARGE_FULL,
+	POWER_SUPPLY_PROP_CHARGE_EMPTY,
+	POWER_SUPPLY_PROP_CHARGE_NOW,
+	POWER_SUPPLY_PROP_CHARGE_AVG,
+	POWER_SUPPLY_PROP_ENERGY_FULL_DESIGN,
+	POWER_SUPPLY_PROP_ENERGY_EMPTY_DESIGN,
+	POWER_SUPPLY_PROP_ENERGY_FULL,
+	POWER_SUPPLY_PROP_ENERGY_EMPTY,
+	POWER_SUPPLY_PROP_ENERGY_NOW,
+	POWER_SUPPLY_PROP_ENERGY_AVG,
+	POWER_SUPPLY_PROP_CAPACITY, /* in percents! */
+	POWER_SUPPLY_PROP_CAPACITY_LEVEL,
+	POWER_SUPPLY_PROP_TEMP,
+	POWER_SUPPLY_PROP_TEMP_AMBIENT,
+	POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
+	POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG,
+	POWER_SUPPLY_PROP_TIME_TO_FULL_NOW,
+	POWER_SUPPLY_PROP_TIME_TO_FULL_AVG,
+	/* Properties of type `const char *' */
+	POWER_SUPPLY_PROP_MODEL_NAME,
+	POWER_SUPPLY_PROP_MANUFACTURER,
+};
+
+enum power_supply_type {
+	POWER_SUPPLY_TYPE_BATTERY = 0,
+	POWER_SUPPLY_TYPE_UPS,
+	POWER_SUPPLY_TYPE_MAINS,
+	POWER_SUPPLY_TYPE_USB,
+};
+
+union power_supply_propval {
+	int intval;
+	const char *strval;
+};
+
+struct power_supply {
+	const char *name;
+	enum power_supply_type type;
+	enum power_supply_property *properties;
+	size_t num_properties;
+
+	char **supplied_to;
+	size_t num_supplicants;
+
+	int (*get_property)(struct power_supply *psy,
+			    enum power_supply_property psp,
+			    union power_supply_propval *val);
+	void (*external_power_changed)(struct power_supply *psy);
+
+	/* For APM emulation, think legacy userspace. */
+	int use_for_apm;
+
+	/* private */
+	struct device *dev;
+	struct work_struct changed_work;
+
+#ifdef CONFIG_LEDS_TRIGGERS
+	struct led_trigger *charging_full_trig;
+	char *charging_full_trig_name;
+	struct led_trigger *charging_trig;
+	char *charging_trig_name;
+	struct led_trigger *full_trig;
+	char *full_trig_name;
+	struct led_trigger *online_trig;
+	char *online_trig_name;
+#endif
+};
+
+/*
+ * This is recommended structure to specify static power supply parameters.
+ * Generic one, parametrizable for different power supplies. Power supply
+ * class itself does not use it, but that's what implementing most platform
+ * drivers, should try reuse for consistency.
+ */
+
+struct power_supply_info {
+	const char *name;
+	int technology;
+	int voltage_max_design;
+	int voltage_min_design;
+	int charge_full_design;
+	int charge_empty_design;
+	int energy_full_design;
+	int energy_empty_design;
+	int use_for_apm;
+};
+
+extern void power_supply_changed(struct power_supply *psy);
+extern int power_supply_am_i_supplied(struct power_supply *psy);
+
+extern int power_supply_register(struct device *parent,
+				 struct power_supply *psy);
+extern void power_supply_unregister(struct power_supply *psy);
+
+/* For APM emulation, think legacy userspace. */
+extern struct class *power_supply_class;
+
+#endif /* __LINUX_POWER_SUPPLY_H__ */