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Subject[PATCH 3/7] Universal battery class
Signed-off-by: Anton Vorontsov <cbou@mail.ru>
---
Documentation/battery-class.txt | 150 ++++++++++++++++++
drivers/Kconfig | 2 +
drivers/Makefile | 1 +
drivers/battery/Kconfig | 11 ++
drivers/battery/Makefile | 1 +
drivers/battery/battery.c | 323 +++++++++++++++++++++++++++++++++++++++
include/linux/battery.h | 125 +++++++++++++++
7 files changed, 613 insertions(+), 0 deletions(-)
create mode 100644 Documentation/battery-class.txt
create mode 100644 drivers/battery/Kconfig
create mode 100644 drivers/battery/Makefile
create mode 100644 drivers/battery/battery.c
create mode 100644 include/linux/battery.h
diff --git a/Documentation/battery-class.txt b/Documentation/battery-class.txt
new file mode 100644
index 0000000..6a7d591
--- /dev/null
+++ b/Documentation/battery-class.txt
@@ -0,0 +1,150 @@
+Linux battery class
+===================
+
+Synopsis
+~~~~~~~~
+Battery class used to export battery properties to userspace in consistent
+manner.
+
+It defines core set of battery attributes, available via sysfs, which
+should be applicable to (almost) every battery out there. Each attribute
+has well defined meaning, up to unit of measure used. While the attributes
+provided are believed to be universally applicable to any battery,
+specific monitoring hardware may not be able to provide them all, so
+any of them may be skipped.
+
+Battery 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 batteries
+or their drivers, it can be added to the core set).
+
+Battery class integrates with External Power framework, for the purpose of
+notification battery drivers when charging power is available. Note that
+specific charge control is left to the battery drivers.
+
+It also integrates with LED framework, for the purpose of providing
+typically expected (at least for portable devices) feedback of battery
+status (charging/fully charged) via LEDs. (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
+~~~~~~~~~~~~~~~~~~~~~
+Battery class has predefined set of attributes, this eliminates code
+duplication across battery drivers. Battery class insist on reusing its
+predefined attributes *and* their units.
+
+So, userspace gets expected set of attributes and their units for
+any kind of battery, and can process/present them to a user in consistent
+manner. Results for different batteries and machines are also directly
+comparable.
+
+See drivers/battery/ds2760_battery.c for the example how to declare and
+handle attributes.
+
+
+Units
+~~~~~
+Quoting include/linux/battery.h:
+
+ All voltages, currents, charges, energies, time and temperatures in uV,
+ uA, uAh, uWh, 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" (uAh) and "energy" (uWh) represents "capacity" ~
+~ of battery, battery class distinguish these terms. Don't mix them! ~
+~ ~
+~ CHARGE_* attributes represents capacity in uAh only. ~
+~ ENERGY_* attributes represents capacity in uWh 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
+BATTERY_HEALTH_*, defined in battery.h.
+
+VOLTAGE_MAX_DESIGN, VOLTAGE_MIN_DESIGN - design values for maximal and
+minimal battery 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.
+
+TEMP - temperature of the battery.
+
+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)
+
+
+QA
+~~
+Q: Where is BATTERY_PROP_XYZ attribute?
+A: If you cannot find attribute suitable for your battery needs, feel free
+ to add it and send patch along with your battery driver.
+
+ The attributes available currently are the ones currently provided by the
+ drivers written.
+
+ Good candidates to add in future: battery technology, 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. Battery class is designed to export battery 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 battery 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.
diff --git a/drivers/Kconfig b/drivers/Kconfig
index c546de3..c3a0038 100644
--- a/drivers/Kconfig
+++ b/drivers/Kconfig
@@ -56,6 +56,8 @@ source "drivers/w1/Kconfig"

source "drivers/power/Kconfig"

+source "drivers/battery/Kconfig"
+
source "drivers/hwmon/Kconfig"

source "drivers/mfd/Kconfig"
diff --git a/drivers/Makefile b/drivers/Makefile
index 2bdaae7..7cbfd37 100644
--- a/drivers/Makefile
+++ b/drivers/Makefile
@@ -61,6 +61,7 @@ obj-$(CONFIG_RTC_LIB) += rtc/
obj-$(CONFIG_I2C) += i2c/
obj-$(CONFIG_W1) += w1/
obj-$(CONFIG_EXTERNAL_POWER) += power/
+obj-$(CONFIG_BATTERY) += battery/
obj-$(CONFIG_HWMON) += hwmon/
obj-$(CONFIG_PHONE) += telephony/
obj-$(CONFIG_MD) += md/
diff --git a/drivers/battery/Kconfig b/drivers/battery/Kconfig
new file mode 100644
index 0000000..c386593
--- /dev/null
+++ b/drivers/battery/Kconfig
@@ -0,0 +1,11 @@
+
+menu "Battery support"
+
+config BATTERY
+ tristate "Battery monitoring support"
+ select EXTERNAL_POWER
+ help
+ Say Y here to enable generic battery status reporting in
+ the /sys filesystem.
+
+endmenu
diff --git a/drivers/battery/Makefile b/drivers/battery/Makefile
new file mode 100644
index 0000000..a2239cb
--- /dev/null
+++ b/drivers/battery/Makefile
@@ -0,0 +1 @@
+obj-$(CONFIG_BATTERY) += battery.o
diff --git a/drivers/battery/battery.c b/drivers/battery/battery.c
new file mode 100644
index 0000000..66dc727
--- /dev/null
+++ b/drivers/battery/battery.c
@@ -0,0 +1,323 @@
+/*
+ * Universal battery monitor class
+ *
+ * Copyright (c) 2007 Anton Vorontsov <cbou@mail.ru>
+ * Copyright (c) 2004 Szabolcs Gyurko
+ * Copyright (c) 2003 Ian Molton <spyro@f2s.com>
+ *
+ * Modified: 2004, Oct Szabolcs Gyurko
+ *
+ * You may use this code as per GPL version 2
+ *
+ * All voltages, currents, charges, energies, time and temperatures in uV,
+ * uA, uAh, uWh, 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.
+ */
+
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/init.h>
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/battery.h>
+
+/* If we have hwtimer trigger, then use it to blink charging LED */
+#if defined(CONFIG_LEDS_TRIGGER_HWTIMER) || \
+ (defined(CONFIG_BATTERY_MODULE) && \
+ defined(CONFIG_LEDS_TRIGGER_HWTIMER_MODULE))
+ #define led_trigger_register_charging led_trigger_register_hwtimer
+ #define led_trigger_unregister_charging led_trigger_unregister_hwtimer
+#else
+ #define led_trigger_register_charging led_trigger_register_simple
+ #define led_trigger_unregister_charging led_trigger_unregister_simple
+#endif
+
+struct class *battery_class;
+
+static void battery_external_power_changed(struct power_supplicant *pst,
+ struct power_supply *psy)
+{
+ struct battery *bat = container_of(pst, struct battery, pst);
+
+ pr_debug("%s\n", __FUNCTION__);
+ if (bat->external_power_changed)
+ bat->external_power_changed(bat);
+
+ return;
+}
+
+int battery_is_external_power_supplied(struct battery *bat)
+{
+ pr_debug("%s\n", __FUNCTION__);
+ return power_supplicant_am_i_supplied(&bat->pst);
+}
+
+void battery_status_changed(struct battery *bat)
+{
+ void *value;
+
+ pr_debug("%s\n", __FUNCTION__);
+
+ value = bat->get_property(bat, BATTERY_PROP_STATUS);
+ if (!value)
+ return;
+
+#ifdef CONFIG_LEDS_TRIGGERS
+ switch(*(int *)value) {
+ case BATTERY_STATUS_FULL:
+ led_trigger_event(bat->charging_full_trig, LED_FULL);
+ led_trigger_event(bat->charging_trig, LED_OFF);
+ led_trigger_event(bat->full_trig, LED_FULL);
+ break;
+ case BATTERY_STATUS_CHARGING:
+ led_trigger_event(bat->charging_full_trig, LED_FULL);
+ led_trigger_event(bat->charging_trig, LED_FULL);
+ led_trigger_event(bat->full_trig, LED_OFF);
+ break;
+ default:
+ led_trigger_event(bat->charging_full_trig, LED_OFF);
+ led_trigger_event(bat->charging_trig, LED_OFF);
+ led_trigger_event(bat->full_trig, LED_OFF);
+ break;
+ }
+#endif /* CONFIG_LEDS_TRIGGERS */
+ return;
+}
+
+/*
+ * This is because the name "current" breaks the device attr macro.
+ * The "current" word resolvs 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 BATTERY_ATTR(_name) \
+{ \
+ .attr = { .name = #_name, .mode = 0444, .owner = THIS_MODULE }, \
+ .show = battery_show_property, \
+ .store = NULL, \
+}
+
+static struct device_attribute battery_attrs[];
+
+static ssize_t battery_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"
+ };
+ struct battery *bat = dev_get_drvdata(dev);
+ const off_t off = attr - battery_attrs;
+ void *value = bat->get_property(bat, off);
+
+ if (!value)
+ return sprintf(buf, "Driver can't report this property, "
+ "but claimed it can. Fix it.\n");
+
+ if (off == BATTERY_PROP_STATUS)
+ return sprintf(buf, "%s\n", status_text[*(int *)value]);
+ else if (off == BATTERY_PROP_HEALTH)
+ return sprintf(buf, "%s\n", health_text[*(int *)value]);
+ else
+ return sprintf(buf, "%d\n", *(int *)value);
+}
+
+/* Must be in the same order as BATTERY_PROP_*, defined in battery.h */
+static struct device_attribute battery_attrs[] = {
+ BATTERY_ATTR(status),
+ BATTERY_ATTR(health),
+ BATTERY_ATTR(voltage_max_design),
+ BATTERY_ATTR(voltage_min_design),
+ BATTERY_ATTR(voltage_now),
+ BATTERY_ATTR(voltage_avg),
+ BATTERY_ATTR(current_now),
+ BATTERY_ATTR(current_avg),
+ BATTERY_ATTR(charge_full_design),
+ BATTERY_ATTR(charge_empty_design),
+ BATTERY_ATTR(charge_full),
+ BATTERY_ATTR(charge_empty),
+ BATTERY_ATTR(charge_now),
+ BATTERY_ATTR(charge_avg),
+ BATTERY_ATTR(energy_full_design),
+ BATTERY_ATTR(energy_empty_design),
+ BATTERY_ATTR(energy_full),
+ BATTERY_ATTR(energy_empty),
+ BATTERY_ATTR(energy_now),
+ BATTERY_ATTR(energy_avg),
+ BATTERY_ATTR(capacity),
+ BATTERY_ATTR(temp),
+ BATTERY_ATTR(time_to_empty_now),
+ BATTERY_ATTR(time_to_empty_avg),
+ BATTERY_ATTR(time_to_full_now),
+ BATTERY_ATTR(time_to_full_avg),
+};
+
+static int battery_create_attrs(struct battery *bat)
+{
+ int rc = 0;
+ int i;
+
+ for (i = 0; i < bat->num_properties; i++) {
+ rc = device_create_file(bat->dev,
+ &battery_attrs[bat->properties[i]]);
+ if (rc)
+ goto failed;
+ }
+
+ goto succeed;
+
+failed:
+ while (i--)
+ device_remove_file(bat->dev,
+ &battery_attrs[bat->properties[i]]);
+succeed:
+ return rc;
+}
+
+static void battery_remove_attrs(struct battery *bat)
+{
+ int i;
+
+ for (i = 0; i < bat->num_properties; i++)
+ device_remove_file(bat->dev,
+ &battery_attrs[bat->properties[i]]);
+
+ return;
+}
+
+int battery_register(struct device *parent, struct battery *bat)
+{
+ int rc = 0;
+
+ bat->dev = device_create(battery_class, parent, 0, "%s", bat->name);
+ if (IS_ERR(bat->dev)) {
+ rc = PTR_ERR(bat->dev);
+ goto dev_create_failed;
+ }
+
+ dev_set_drvdata(bat->dev, bat);
+
+ rc = battery_create_attrs(bat);
+ if (rc)
+ goto create_bat_attrs_failed;
+
+ bat->pst.name = bat->name;
+ bat->pst.power_supply_changed = battery_external_power_changed;
+ rc = power_supplicant_register(&bat->pst);
+ if (rc)
+ goto power_supplicant_failed;
+
+#ifdef CONFIG_LEDS_TRIGGERS
+ bat->charging_full_trig_name = kmalloc(strlen(bat->name) +
+ sizeof("-charging-or-full"), GFP_KERNEL);
+ if (!bat->charging_full_trig_name) {
+ rc = -ENOMEM;
+ goto charging_full_trig_name_failed;
+ }
+
+ bat->charging_trig_name = kmalloc(strlen(bat->name) +
+ sizeof("-charging"), GFP_KERNEL);
+ if (!bat->charging_trig_name) {
+ rc = -ENOMEM;
+ goto charging_trig_name_failed;
+ }
+
+ bat->full_trig_name = kmalloc(strlen(bat->name) +
+ sizeof("-full"), GFP_KERNEL);
+ if (!bat->full_trig_name) {
+ rc = -ENOMEM;
+ goto full_trig_name_failed;
+ }
+
+ strcpy(bat->charging_full_trig_name, bat->name);
+ strcat(bat->charging_full_trig_name, "-charging-or-full");
+ strcpy(bat->charging_trig_name, bat->name);
+ strcat(bat->charging_trig_name, "-charging");
+ strcpy(bat->full_trig_name, bat->name);
+ strcat(bat->full_trig_name, "-full");
+
+ led_trigger_register_simple(bat->charging_full_trig_name,
+ &bat->charging_full_trig);
+ led_trigger_register_charging(bat->charging_trig_name,
+ &bat->charging_trig);
+ led_trigger_register_simple(bat->full_trig_name,
+ &bat->full_trig);
+#endif /* CONFIG_LEDS_TRIGGERS */
+
+ goto success;
+
+#ifdef CONFIG_LEDS_TRIGGERS
+full_trig_name_failed:
+ kfree(bat->charging_trig_name);
+charging_trig_name_failed:
+ kfree(bat->charging_full_trig_name);
+charging_full_trig_name_failed:
+#endif
+ power_supplicant_unregister(&bat->pst);
+power_supplicant_failed:
+ battery_remove_attrs(bat);
+create_bat_attrs_failed:
+ device_unregister(bat->dev);
+dev_create_failed:
+success:
+ return rc;
+}
+
+void battery_unregister(struct battery *bat)
+{
+ power_supplicant_unregister(&bat->pst);
+ battery_remove_attrs(bat);
+ device_unregister(bat->dev);
+
+#ifdef CONFIG_LEDS_TRIGGERS
+ led_trigger_unregister_charging(bat->charging_full_trig);
+ led_trigger_unregister_charging(bat->charging_trig);
+ led_trigger_unregister_simple(bat->full_trig);
+ kfree(bat->full_trig_name);
+ kfree(bat->charging_trig_name);
+ kfree(bat->charging_full_trig_name);
+#endif
+ return;
+}
+
+static int __init battery_class_init(void)
+{
+ battery_class = class_create(THIS_MODULE, "battery");
+
+ if (IS_ERR(battery_class))
+ return PTR_ERR(battery_class);
+
+ return 0;
+}
+
+static void __exit battery_class_exit(void)
+{
+ class_destroy(battery_class);
+ return;
+}
+
+EXPORT_SYMBOL_GPL(battery_register);
+EXPORT_SYMBOL_GPL(battery_unregister);
+EXPORT_SYMBOL_GPL(battery_status_changed);
+EXPORT_SYMBOL_GPL(battery_is_external_power_supplied);
+
+/* exported for the APM Power driver, APM emulation */
+EXPORT_SYMBOL_GPL(battery_class);
+
+subsys_initcall(battery_class_init);
+module_exit(battery_class_exit);
+
+MODULE_DESCRIPTION("Universal battery monitor class");
+MODULE_AUTHOR("Ian Molton <spyro@f2s.com>, "
+ "Szabolcs Gyurko, "
+ "Anton Vorontsov <cbou@mail.ru>");
+MODULE_LICENSE("GPL");
diff --git a/include/linux/battery.h b/include/linux/battery.h
new file mode 100644
index 0000000..2743f88
--- /dev/null
+++ b/include/linux/battery.h
@@ -0,0 +1,125 @@
+/*
+ * Universal battery monitor class
+ *
+ * Copyright (c) 2007 Anton Vorontsov <cbou@mail.ru>
+ * Copyright (c) 2004 Szabolcs Gyurko
+ * Copyright (c) 2003 Ian Molton <spyro@f2s.com>
+ *
+ * Modified: 2004, Oct Szabolcs Gyurko
+ *
+ * You may use this code as per GPL version 2
+ *
+ * All voltages, currents, charges, energies, time and temperatures in uV,
+ * uA, uAh, uWh, 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.
+ */
+
+#ifndef __LINUX_BATTERY_H__
+#define __LINUX_BATTERY_H__
+
+#include <linux/device.h>
+#include <linux/external_power.h>
+#include <linux/leds.h>
+
+#define BATTERY_STATUS_UNKNOWN 0
+#define BATTERY_STATUS_CHARGING 1
+#define BATTERY_STATUS_DISCHARGING 2
+#define BATTERY_STATUS_NOT_CHARGING 3
+#define BATTERY_STATUS_FULL 4
+
+#define BATTERY_HEALTH_UNKNOWN 0
+#define BATTERY_HEALTH_GOOD 1
+#define BATTERY_HEALTH_OVERHEAT 2
+#define BATTERY_HEALTH_DEAD 3
+
+/*
+ * 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 battery_property {
+ BATTERY_PROP_STATUS = 0,
+ BATTERY_PROP_HEALTH,
+ BATTERY_PROP_VOLTAGE_MAX_DESIGN,
+ BATTERY_PROP_VOLTAGE_MIN_DESIGN,
+ BATTERY_PROP_VOLTAGE_NOW,
+ BATTERY_PROP_VOLTAGE_AVG,
+ BATTERY_PROP_CURRENT_NOW,
+ BATTERY_PROP_CURRENT_AVG,
+ BATTERY_PROP_CHARGE_FULL_DESIGN,
+ BATTERY_PROP_CHARGE_EMPTY_DESIGN,
+ BATTERY_PROP_CHARGE_FULL,
+ BATTERY_PROP_CHARGE_EMPTY,
+ BATTERY_PROP_CHARGE_NOW,
+ BATTERY_PROP_CHARGE_AVG,
+ BATTERY_PROP_ENERGY_FULL_DESIGN,
+ BATTERY_PROP_ENERGY_EMPTY_DESIGN,
+ BATTERY_PROP_ENERGY_FULL,
+ BATTERY_PROP_ENERGY_EMPTY,
+ BATTERY_PROP_ENERGY_NOW,
+ BATTERY_PROP_ENERGY_AVG,
+ BATTERY_PROP_CAPACITY, /* in percents! */
+ BATTERY_PROP_TEMP,
+ BATTERY_PROP_TIME_TO_EMPTY_NOW,
+ BATTERY_PROP_TIME_TO_EMPTY_AVG,
+ BATTERY_PROP_TIME_TO_FULL_NOW,
+ BATTERY_PROP_TIME_TO_FULL_AVG,
+};
+
+struct battery {
+ char *name;
+ enum battery_property *properties;
+ size_t num_properties;
+
+ /* For APM emulation, think legacy userspace. */
+ int main_battery;
+
+ /* executed in userspace, feel free to sleep */
+ void *(*get_property)(struct battery *bat, enum battery_property);
+
+ /* drivers should not sleep inside it, you'll get there from ISRs */
+ void (*external_power_changed)(struct battery *bat);
+
+ /* private */
+ struct device *dev;
+ struct power_supplicant pst;
+
+#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;
+#endif
+};
+
+/*
+ * This is recommended structure to specify static battery parameters.
+ * Generic one, parametrizable for different batteries. Battery device
+ * itself does not use it, but that's what implementing most drivers,
+ * should try reuse for consistency.
+ */
+
+struct battery_info {
+ char *name;
+ 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 main_battery;
+};
+
+extern void battery_status_changed(struct battery *bat);
+extern int battery_is_external_power_supplied(struct battery *bat);
+extern int battery_register(struct device *parent, struct battery *bat);
+extern void battery_unregister(struct battery *bat);
+
+/* For APM emulation, think legacy userspace. */
+extern struct class *battery_class;
+
+#endif /* __LINUX_BATTERY_H__ */
--
1.5.1.1-dirty
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