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[BATTERY] Universal power supply class (was: battery class)
This class is result of "external power" and "battery" classes merge,
as suggested by David Woodhouse. He also implemented uevent support.
Here how userspace seeing it now:
# ls /sys/class/power\ supply/
ac main-battery usb
# cat /sys/class/power\ supply/ac/type
AC
# cat /sys/class/power\ supply/usb/type
USB
# cat /sys/class/power\ supply/main-battery/type
Battery
# cat /sys/class/power\ supply/ac/online
1
# cat /sys/class/power\ supply/usb/online
0
# cat /sys/class/power\ supply/main-battery/status
Charging
# cat /sys/class/leds/h5400\:red-left/trigger
none h5400-radio timer hwtimer ac-online usb-online
main-battery-charging-or-full [main-battery-charging]
main-battery-full
Signed-off-by: Anton Vorontsov <cbou@mail.ru>
Signed-off-by: David Woodhouse <dwmw2@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Anton Vorontsov
David Woodhouse
parent
7dcca30a32
commit
4a11b59d82
167
Documentation/power_supply_class.txt
Normal file
167
Documentation/power_supply_class.txt
Normal file
@ -0,0 +1,167 @@
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Linux power supply class
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========================
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Synopsis
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~~~~~~~~
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Power supply class used to represent battery, UPS, AC or DC power supply
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properties to user-space.
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It defines core set of attributes, which should be applicable to (almost)
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every power supply out there. Attributes are available via sysfs and uevent
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interfaces.
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Each attribute has well defined meaning, up to unit of measure used. While
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the attributes provided are believed to be universally applicable to any
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power supply, specific monitoring hardware may not be able to provide them
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all, so any of them may be skipped.
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Power supply class is extensible, and allows to define drivers own attributes.
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The core attribute set is subject to the standard Linux evolution (i.e.
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if it will be found that some attribute is applicable to many power supply
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types or their drivers, it can be added to the core set).
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It also integrates with LED framework, for the purpose of providing
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typically expected feedback of battery charging/fully charged status and
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AC/USB power supply online status. (Note that specific details of the
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indication (including whether to use it at all) are fully controllable by
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user and/or specific machine defaults, per design principles of LED
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framework).
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Attributes/properties
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~~~~~~~~~~~~~~~~~~~~~
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Power supply class has predefined set of attributes, this eliminates code
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duplication across drivers. Power supply class insist on reusing its
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predefined attributes *and* their units.
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So, userspace gets predictable set of attributes and their units for any
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kind of power supply, and can process/present them to a user in consistent
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manner. Results for different power supplies and machines are also directly
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comparable.
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See drivers/power/ds2760_battery.c and drivers/power/pda_power.c for the
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example how to declare and handle attributes.
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Units
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~~~~~
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Quoting include/linux/power_supply.h:
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All voltages, currents, charges, energies, time and temperatures in µV,
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µA, µAh, µWh, seconds and tenths of degree Celsius unless otherwise
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stated. It's driver's job to convert its raw values to units in which
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this class operates.
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Attributes/properties detailed
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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~ ~ ~ ~ ~ ~ ~ Charge/Energy/Capacity - how to not confuse ~ ~ ~ ~ ~ ~ ~
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~ ~
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~ Because both "charge" (µAh) and "energy" (µWh) represents "capacity" ~
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~ of battery, this class distinguish these terms. Don't mix them! ~
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~ ~
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~ CHARGE_* attributes represents capacity in µAh only. ~
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~ ENERGY_* attributes represents capacity in µWh only. ~
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~ CAPACITY attribute represents capacity in *percents*, from 0 to 100. ~
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~ ~
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~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
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Postfixes:
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_AVG - *hardware* averaged value, use it if your hardware is really able to
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report averaged values.
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_NOW - momentary/instantaneous values.
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STATUS - this attribute represents operating status (charging, full,
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discharging (i.e. powering a load), etc.). This corresponds to
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BATTERY_STATUS_* values, as defined in battery.h.
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HEALTH - represents health of the battery, values corresponds to
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POWER_SUPPLY_HEALTH_*, defined in battery.h.
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VOLTAGE_MAX_DESIGN, VOLTAGE_MIN_DESIGN - design values for maximal and
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minimal power supply voltages. Maximal/minimal means values of voltages
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when battery considered "full"/"empty" at normal conditions. Yes, there is
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no direct relation between voltage and battery capacity, but some dumb
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batteries use voltage for very approximated calculation of capacity.
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Battery driver also can use this attribute just to inform userspace
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about maximal and minimal voltage thresholds of a given battery.
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CHARGE_FULL_DESIGN, CHARGE_EMPTY_DESIGN - design charge values, when
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battery considered full/empty.
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ENERGY_FULL_DESIGN, ENERGY_EMPTY_DESIGN - same as above but for energy.
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CHARGE_FULL, CHARGE_EMPTY - These attributes means "last remembered value
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of charge when battery became full/empty". It also could mean "value of
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charge when battery considered full/empty at given conditions (temperature,
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age)". I.e. these attributes represents real thresholds, not design values.
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ENERGY_FULL, ENERGY_EMPTY - same as above but for energy.
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CAPACITY - capacity in percents.
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CAPACITY_LEVEL - capacity level. This corresponds to
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POWER_SUPPLY_CAPACITY_LEVEL_*.
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TEMP - temperature of the power supply.
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TEMP_AMBIENT - ambient temperature.
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TIME_TO_EMPTY - seconds left for battery to be considered empty (i.e.
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while battery powers a load)
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TIME_TO_FULL - seconds left for battery to be considered full (i.e.
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while battery is charging)
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Battery <-> external power supply interaction
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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Often power supplies are acting as supplies and supplicants at the same
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time. Batteries are good example. So, batteries usually care if they're
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externally powered or not.
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For that case, power supply class implements notification mechanism for
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batteries.
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External power supply (AC) lists supplicants (batteries) names in
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"supplied_to" struct member, and each power_supply_changed() call
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issued by external power supply will notify supplicants via
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external_power_changed callback.
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QA
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~~
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Q: Where is POWER_SUPPLY_PROP_XYZ attribute?
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A: If you cannot find attribute suitable for your driver needs, feel free
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to add it and send patch along with your driver.
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The attributes available currently are the ones currently provided by the
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drivers written.
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Good candidates to add in future: model/part#, cycle_time, manufacturer,
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etc.
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Q: I have some very specific attribute (e.g. battery color), should I add
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this attribute to standard ones?
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A: Most likely, no. Such attribute can be placed in the driver itself, if
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it is useful. Of course, if the attribute in question applicable to
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large set of batteries, provided by many drivers, and/or comes from
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some general battery specification/standard, it may be a candidate to
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be added to the core attribute set.
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Q: Suppose, my battery monitoring chip/firmware does not provides capacity
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in percents, but provides charge_{now,full,empty}. Should I calculate
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percentage capacity manually, inside the driver, and register CAPACITY
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attribute? The same question about time_to_empty/time_to_full.
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A: Most likely, no. This class is designed to export properties which are
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directly measurable by the specific hardware available.
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Inferring not available properties using some heuristics or mathematical
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model is not subject of work for a battery driver. Such functionality
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should be factored out, and in fact, apm_power, the driver to serve
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legacy APM API on top of power supply class, uses a simple heuristic of
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approximating remaining battery capacity based on its charge, current,
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voltage and so on. But full-fledged battery model is likely not subject
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for kernel at all, as it would require floating point calculation to deal
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with things like differential equations and Kalman filters. This is
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better be handled by batteryd/libbattery, yet to be written.
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@ -54,6 +54,8 @@ source "drivers/spi/Kconfig"
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source "drivers/w1/Kconfig"
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source "drivers/power/Kconfig"
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source "drivers/hwmon/Kconfig"
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source "drivers/mfd/Kconfig"
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@ -61,6 +61,7 @@ obj-$(CONFIG_I2O) += message/
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obj-$(CONFIG_RTC_LIB) += rtc/
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obj-y += i2c/
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obj-$(CONFIG_W1) += w1/
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obj-$(CONFIG_POWER_SUPPLY) += power/
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obj-$(CONFIG_HWMON) += hwmon/
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obj-$(CONFIG_PHONE) += telephony/
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obj-$(CONFIG_MD) += md/
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17
drivers/power/Kconfig
Normal file
17
drivers/power/Kconfig
Normal file
@ -0,0 +1,17 @@
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menuconfig POWER_SUPPLY
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tristate "Power supply class support"
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help
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Say Y here to enable power supply class support. This allows
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power supply (batteries, AC, USB) monitoring by userspace
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via sysfs and uevent (if available) and/or APM kernel interface
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(if selected below).
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if POWER_SUPPLY
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config POWER_SUPPLY_DEBUG
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bool "Power supply debug"
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help
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Say Y here to enable debugging messages for power supply class
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and drivers.
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endif # POWER_SUPPLY
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15
drivers/power/Makefile
Normal file
15
drivers/power/Makefile
Normal file
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power_supply-objs := power_supply_core.o
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ifeq ($(CONFIG_SYSFS),y)
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power_supply-objs += power_supply_sysfs.o
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endif
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ifeq ($(CONFIG_LEDS_TRIGGERS),y)
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power_supply-objs += power_supply_leds.o
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endif
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ifeq ($(CONFIG_POWER_SUPPLY_DEBUG),y)
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EXTRA_CFLAGS += -DDEBUG
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endif
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obj-$(CONFIG_POWER_SUPPLY) += power_supply.o
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42
drivers/power/power_supply.h
Normal file
42
drivers/power/power_supply.h
Normal file
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/*
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* Functions private to power supply class
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*
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* Copyright © 2007 Anton Vorontsov <cbou@mail.ru>
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* Copyright © 2004 Szabolcs Gyurko
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* Copyright © 2003 Ian Molton <spyro@f2s.com>
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*
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* Modified: 2004, Oct Szabolcs Gyurko
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*
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* You may use this code as per GPL version 2
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*/
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#ifdef CONFIG_SYSFS
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extern int power_supply_create_attrs(struct power_supply *psy);
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extern void power_supply_remove_attrs(struct power_supply *psy);
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extern int power_supply_uevent(struct device *dev, char **envp, int num_envp,
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char *buffer, int buffer_size);
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#else
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static inline int power_supply_create_attrs(struct power_supply *psy)
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{ return 0; }
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static inline void power_supply_remove_attrs(struct power_supply *psy) {}
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#define power_supply_uevent NULL
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#endif /* CONFIG_SYSFS */
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#ifdef CONFIG_LEDS_TRIGGERS
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extern void power_supply_update_leds(struct power_supply *psy);
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extern int power_supply_create_triggers(struct power_supply *psy);
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extern void power_supply_remove_triggers(struct power_supply *psy);
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#else
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static inline void power_supply_update_leds(struct power_supply *psy) {}
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static inline int power_supply_create_triggers(struct power_supply *psy)
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{ return 0; }
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static inline void power_supply_remove_triggers(struct power_supply *psy) {}
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#endif /* CONFIG_LEDS_TRIGGERS */
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168
drivers/power/power_supply_core.c
Normal file
168
drivers/power/power_supply_core.c
Normal file
@ -0,0 +1,168 @@
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/*
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* Universal power supply monitor class
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*
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* Copyright © 2007 Anton Vorontsov <cbou@mail.ru>
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* Copyright © 2004 Szabolcs Gyurko
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* Copyright © 2003 Ian Molton <spyro@f2s.com>
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*
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* Modified: 2004, Oct Szabolcs Gyurko
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*
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* You may use this code as per GPL version 2
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*/
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/init.h>
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#include <linux/device.h>
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#include <linux/err.h>
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#include <linux/power_supply.h>
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#include "power_supply.h"
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struct class *power_supply_class;
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static void power_supply_changed_work(struct work_struct *work)
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{
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struct power_supply *psy = container_of(work, struct power_supply,
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changed_work);
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int i;
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dev_dbg(psy->dev, "%s\n", __FUNCTION__);
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for (i = 0; i < psy->num_supplicants; i++) {
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struct device *dev;
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down(&power_supply_class->sem);
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list_for_each_entry(dev, &power_supply_class->devices, node) {
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struct power_supply *pst = dev_get_drvdata(dev);
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if (!strcmp(psy->supplied_to[i], pst->name)) {
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if (pst->external_power_changed)
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pst->external_power_changed(pst);
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}
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}
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up(&power_supply_class->sem);
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}
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power_supply_update_leds(psy);
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kobject_uevent(&psy->dev->kobj, KOBJ_CHANGE);
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return;
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}
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void power_supply_changed(struct power_supply *psy)
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{
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dev_dbg(psy->dev, "%s\n", __FUNCTION__);
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schedule_work(&psy->changed_work);
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return;
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}
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int power_supply_am_i_supplied(struct power_supply *psy)
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{
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union power_supply_propval ret = {0,};
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struct device *dev;
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down(&power_supply_class->sem);
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list_for_each_entry(dev, &power_supply_class->devices, node) {
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struct power_supply *epsy = dev_get_drvdata(dev);
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int i;
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for (i = 0; i < epsy->num_supplicants; i++) {
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if (!strcmp(epsy->supplied_to[i], psy->name)) {
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if (epsy->get_property(epsy,
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POWER_SUPPLY_PROP_ONLINE, &ret))
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continue;
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if (ret.intval)
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goto out;
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}
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}
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}
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out:
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up(&power_supply_class->sem);
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dev_dbg(psy->dev, "%s %d\n", __FUNCTION__, ret.intval);
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return ret.intval;
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}
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int power_supply_register(struct device *parent, struct power_supply *psy)
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{
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int rc = 0;
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psy->dev = device_create(power_supply_class, parent, 0,
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"%s", psy->name);
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if (IS_ERR(psy->dev)) {
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rc = PTR_ERR(psy->dev);
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goto dev_create_failed;
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}
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dev_set_drvdata(psy->dev, psy);
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INIT_WORK(&psy->changed_work, power_supply_changed_work);
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rc = power_supply_create_attrs(psy);
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if (rc)
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goto create_attrs_failed;
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rc = power_supply_create_triggers(psy);
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if (rc)
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goto create_triggers_failed;
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power_supply_changed(psy);
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goto success;
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create_triggers_failed:
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power_supply_remove_attrs(psy);
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create_attrs_failed:
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device_unregister(psy->dev);
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dev_create_failed:
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success:
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return rc;
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}
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void power_supply_unregister(struct power_supply *psy)
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{
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flush_scheduled_work();
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power_supply_remove_triggers(psy);
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power_supply_remove_attrs(psy);
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device_unregister(psy->dev);
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return;
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}
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static int __init power_supply_class_init(void)
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{
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power_supply_class = class_create(THIS_MODULE, "power_supply");
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if (IS_ERR(power_supply_class))
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return PTR_ERR(power_supply_class);
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power_supply_class->dev_uevent = power_supply_uevent;
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return 0;
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}
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static void __exit power_supply_class_exit(void)
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{
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class_destroy(power_supply_class);
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return;
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}
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EXPORT_SYMBOL_GPL(power_supply_changed);
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EXPORT_SYMBOL_GPL(power_supply_am_i_supplied);
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EXPORT_SYMBOL_GPL(power_supply_register);
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EXPORT_SYMBOL_GPL(power_supply_unregister);
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/* exported for the APM Power driver, APM emulation */
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EXPORT_SYMBOL_GPL(power_supply_class);
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subsys_initcall(power_supply_class_init);
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module_exit(power_supply_class_exit);
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MODULE_DESCRIPTION("Universal power supply monitor class");
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MODULE_AUTHOR("Ian Molton <spyro@f2s.com>, "
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"Szabolcs Gyurko, "
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"Anton Vorontsov <cbou@mail.ru>");
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MODULE_LICENSE("GPL");
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176
drivers/power/power_supply_leds.c
Normal file
176
drivers/power/power_supply_leds.c
Normal file
@ -0,0 +1,176 @@
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/*
|
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* LEDs triggers for power supply class
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*
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* Copyright © 2007 Anton Vorontsov <cbou@mail.ru>
|
||||
* Copyright © 2004 Szabolcs Gyurko
|
||||
* Copyright © 2003 Ian Molton <spyro@f2s.com>
|
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*
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* Modified: 2004, Oct Szabolcs Gyurko
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*
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||||
* 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;
|
||||
}
|
||||
299
drivers/power/power_supply_sysfs.c
Normal file
299
drivers/power/power_supply_sysfs.c
Normal file
@ -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;
|
||||
}
|
||||
180
include/linux/power_supply.h
Normal file
180
include/linux/power_supply.h
Normal file
@ -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__ */
|
||||
Loading…
Reference in New Issue
Block a user