aboutsummaryrefslogtreecommitdiff
diff options
context:
space:
mode:
Diffstat
-rw-r--r--Documentation/power_supply_class.txt167
-rw-r--r--drivers/Kconfig2
-rw-r--r--drivers/Makefile1
-rw-r--r--drivers/power/Kconfig17
-rw-r--r--drivers/power/Makefile15
-rw-r--r--drivers/power/power_supply.h42
-rw-r--r--drivers/power/power_supply_core.c168
-rw-r--r--drivers/power/power_supply_leds.c176
-rw-r--r--drivers/power/power_supply_sysfs.c299
-rw-r--r--include/linux/power_supply.h180
10 files changed, 1067 insertions, 0 deletions
diff --git a/Documentation/power_supply_class.txt b/Documentation/power_supply_class.txt
new file mode 100644
index 00000000000..9758cf433c0
--- /dev/null
+++ b/Documentation/power_supply_class.txt
@@ -0,0 +1,167 @@
+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.
diff --git a/drivers/Kconfig b/drivers/Kconfig
index 050323fd79e..c546de307ca 100644
--- a/drivers/Kconfig
+++ b/drivers/Kconfig
@@ -54,6 +54,8 @@ source "drivers/spi/Kconfig"
source "drivers/w1/Kconfig"
+source "drivers/power/Kconfig"
+
source "drivers/hwmon/Kconfig"
source "drivers/mfd/Kconfig"
diff --git a/drivers/Makefile b/drivers/Makefile
index adad2f3d438..503d8256944 100644
--- a/drivers/Makefile
+++ b/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-$(CONFIG_MD) += md/
diff --git a/drivers/power/Kconfig b/drivers/power/Kconfig
new file mode 100644
index 00000000000..7811fa62741
--- /dev/null
+++ b/drivers/power/Kconfig
@@ -0,0 +1,17 @@
+menuconfig POWER_SUPPLY
+ tristate "Power supply class support"
+ help
+ Say Y here to enable power supply class support. This allows
+ power supply (batteries, AC, USB) monitoring by userspace
+ via sysfs and uevent (if available) and/or APM kernel interface
+ (if selected below).
+
+if POWER_SUPPLY
+
+config POWER_SUPPLY_DEBUG
+ bool "Power supply debug"
+ help
+ Say Y here to enable debugging messages for power supply class
+ and drivers.
+
+endif # POWER_SUPPLY
diff --git a/drivers/power/Makefile b/drivers/power/Makefile
new file mode 100644
index 00000000000..3c88148983a
--- /dev/null
+++ b/drivers/power/Makefile
@@ -0,0 +1,15 @@
+power_supply-objs := power_supply_core.o
+
+ifeq ($(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
diff --git a/drivers/power/power_supply.h b/drivers/power/power_supply.h
new file mode 100644
index 00000000000..a9880d468ee
--- /dev/null
+++ b/drivers/power/power_supply.h
@@ -0,0 +1,42 @@
+/*
+ * 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 */
diff --git a/drivers/power/power_supply_core.c b/drivers/power/power_supply_core.c
new file mode 100644
index 00000000000..e87ea515675
--- /dev/null
+++ b/drivers/power/power_supply_core.c
@@ -0,0 +1,168 @@
+/*
+ * 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");
diff --git a/drivers/power/power_supply_leds.c b/drivers/power/power_supply_leds.c
new file mode 100644
index 00000000000..7232490bb59
--- /dev/null
+++ b/drivers/power/power_supply_leds.c
@@ -0,0 +1,176 @@
+/*
+ * 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;
+}
diff --git a/drivers/power/power_supply_sysfs.c b/drivers/power/power_supply_sysfs.c
new file mode 100644
index 00000000000..c07d4258d34
--- /dev/null
+++ b/drivers/power/power_supply_sysfs.c
@@ -0,0 +1,299 @@
+/*
+ * 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;
+}
diff --git a/include/linux/power_supply.h b/include/linux/power_supply.h
new file mode 100644
index 00000000000..606c0957997
--- /dev/null
+++ b/include/linux/power_supply.h
@@ -0,0 +1,180 @@
+/*
+ * 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__ */
generated by cgit v1.2.3-18-g5258 (git 2.32.0) at 2024-12-26 06:43:50 +0000