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f0cf057594
Document how the absence of the "present" property in the sysfs power_supply class should be handled. Link: https://gitlab.freedesktop.org/upower/upower/-/merge_requests/173 Cc: Mario Limonciello <mario.limonciello@amd.com> Signed-off-by: Bastien Nocera <hadess@hadess.net> Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
775 lines
22 KiB
Plaintext
775 lines
22 KiB
Plaintext
**General Properties**
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What: /sys/class/power_supply/<supply_name>/manufacturer
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Date: May 2007
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Contact: linux-pm@vger.kernel.org
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Description:
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Reports the name of the device manufacturer.
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Access: Read
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Valid values: Represented as string
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What: /sys/class/power_supply/<supply_name>/model_name
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Date: May 2007
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Contact: linux-pm@vger.kernel.org
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Description:
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Reports the name of the device model.
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Access: Read
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Valid values: Represented as string
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What: /sys/class/power_supply/<supply_name>/serial_number
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Date: January 2008
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Contact: linux-pm@vger.kernel.org
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Description:
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Reports the serial number of the device.
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Access: Read
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Valid values: Represented as string
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What: /sys/class/power_supply/<supply_name>/type
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Date: May 2010
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Contact: linux-pm@vger.kernel.org
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Description:
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Describes the main type of the supply.
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Access: Read
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Valid values: "Battery", "UPS", "Mains", "USB", "Wireless"
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**Battery and USB properties**
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What: /sys/class/power_supply/<supply_name>/current_avg
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Date: May 2007
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Contact: linux-pm@vger.kernel.org
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Description:
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Battery:
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Reports an average IBAT current reading for the battery, over
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a fixed period. Normally devices will provide a fixed interval
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in which they average readings to smooth out the reported
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value.
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USB:
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Reports an average IBUS current reading over a fixed period.
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Normally devices will provide a fixed interval in which they
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average readings to smooth out the reported value.
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Access: Read
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Valid values: Represented in microamps. Negative values are
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used for discharging batteries, positive values for charging
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batteries and for USB IBUS current.
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What: /sys/class/power_supply/<supply_name>/current_max
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Date: October 2010
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Contact: linux-pm@vger.kernel.org
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Description:
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Battery:
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Reports the maximum IBAT current allowed into the battery.
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USB:
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Reports the maximum IBUS current the supply can support.
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Access: Read
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Valid values: Represented in microamps
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What: /sys/class/power_supply/<supply_name>/current_now
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Date: May 2007
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Contact: linux-pm@vger.kernel.org
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Description:
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Battery:
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Reports an instant, single IBAT current reading for the
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battery. This value is not averaged/smoothed.
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Access: Read
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USB:
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Reports the IBUS current supplied now. This value is generally
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read-only reporting, unless the 'online' state of the supply
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is set to be programmable, in which case this value can be set
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within the reported min/max range.
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Access: Read, Write
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Valid values: Represented in microamps. Negative values are
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used for discharging batteries, positive values for charging
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batteries and for USB IBUS current.
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What: /sys/class/power_supply/<supply_name>/temp
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Date: May 2007
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Contact: linux-pm@vger.kernel.org
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Description:
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Battery:
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Reports the current TBAT battery temperature reading.
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USB:
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Reports the current supply temperature reading. This would
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normally be the internal temperature of the device itself
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(e.g TJUNC temperature of an IC)
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Access: Read
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Valid values: Represented in 1/10 Degrees Celsius
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What: /sys/class/power_supply/<supply_name>/temp_alert_max
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Date: July 2012
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Contact: linux-pm@vger.kernel.org
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Description:
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Battery:
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Maximum TBAT temperature trip-wire value where the supply will
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notify user-space of the event.
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USB:
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Maximum supply temperature trip-wire value where the supply
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will notify user-space of the event.
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This is normally used for the charging scenario where
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user-space needs to know if the temperature has crossed an
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upper threshold so it can take appropriate action (e.g. warning
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user that the temperature is critically high, and charging has
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stopped).
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Access: Read
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Valid values: Represented in 1/10 Degrees Celsius
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What: /sys/class/power_supply/<supply_name>/temp_alert_min
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Date: July 2012
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Contact: linux-pm@vger.kernel.org
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Description:
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Battery:
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Minimum TBAT temperature trip-wire value where the supply will
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notify user-space of the event.
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USB:
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Minimum supply temperature trip-wire value where the supply
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will notify user-space of the event.
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This is normally used for the charging scenario where user-space
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needs to know if the temperature has crossed a lower threshold
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so it can take appropriate action (e.g. warning user that
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temperature level is high, and charging current has been
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reduced accordingly to remedy the situation).
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Access: Read
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Valid values: Represented in 1/10 Degrees Celsius
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What: /sys/class/power_supply/<supply_name>/temp_max
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Date: July 2014
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Contact: linux-pm@vger.kernel.org
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Description:
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Battery:
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Reports the maximum allowed TBAT battery temperature for
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charging.
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USB:
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Reports the maximum allowed supply temperature for operation.
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Access: Read
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Valid values: Represented in 1/10 Degrees Celsius
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What: /sys/class/power_supply/<supply_name>/temp_min
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Date: July 2014
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Contact: linux-pm@vger.kernel.org
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Description:
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Battery:
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Reports the minimum allowed TBAT battery temperature for
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charging.
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USB:
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Reports the minimum allowed supply temperature for operation.
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Access: Read
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Valid values: Represented in 1/10 Degrees Celsius
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What: /sys/class/power_supply/<supply_name>/voltage_max,
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Date: January 2008
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Contact: linux-pm@vger.kernel.org
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Description:
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Battery:
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Reports the maximum safe VBAT voltage permitted for the
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battery, during charging.
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USB:
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Reports the maximum VBUS voltage the supply can support.
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Access: Read
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Valid values: Represented in microvolts
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What: /sys/class/power_supply/<supply_name>/voltage_min,
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Date: January 2008
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Contact: linux-pm@vger.kernel.org
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Description:
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Battery:
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Reports the minimum safe VBAT voltage permitted for the
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battery, during discharging.
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USB:
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Reports the minimum VBUS voltage the supply can support.
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Access: Read
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Valid values: Represented in microvolts
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What: /sys/class/power_supply/<supply_name>/voltage_now,
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Date: May 2007
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Contact: linux-pm@vger.kernel.org
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Description:
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Battery:
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Reports an instant, single VBAT voltage reading for the
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battery. This value is not averaged/smoothed.
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Access: Read
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USB:
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Reports the VBUS voltage supplied now. This value is generally
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read-only reporting, unless the 'online' state of the supply
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is set to be programmable, in which case this value can be set
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within the reported min/max range.
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Access: Read, Write
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Valid values: Represented in microvolts
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**Battery Properties**
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What: /sys/class/power_supply/<supply_name>/capacity
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Date: May 2007
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Contact: linux-pm@vger.kernel.org
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Description:
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Fine grain representation of battery capacity.
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Access: Read
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Valid values: 0 - 100 (percent)
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What: /sys/class/power_supply/<supply_name>/capacity_alert_max
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Date: July 2012
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Contact: linux-pm@vger.kernel.org
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Description:
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Maximum battery capacity trip-wire value where the supply will
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notify user-space of the event. This is normally used for the
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battery discharging scenario where user-space needs to know the
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battery has dropped to an upper level so it can take
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appropriate action (e.g. warning user that battery level is
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low).
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Access: Read, Write
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Valid values: 0 - 100 (percent)
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What: /sys/class/power_supply/<supply_name>/capacity_alert_min
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Date: July 2012
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Contact: linux-pm@vger.kernel.org
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Description:
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Minimum battery capacity trip-wire value where the supply will
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notify user-space of the event. This is normally used for the
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battery discharging scenario where user-space needs to know the
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battery has dropped to a lower level so it can take
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appropriate action (e.g. warning user that battery level is
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critically low).
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Access: Read, Write
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Valid values: 0 - 100 (percent)
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What: /sys/class/power_supply/<supply_name>/capacity_error_margin
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Date: April 2019
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Contact: linux-pm@vger.kernel.org
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Description:
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Battery capacity measurement becomes unreliable without
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recalibration. This values provides the maximum error
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margin expected to exist by the fuel gauge in percent.
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Values close to 0% will be returned after (re-)calibration
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has happened. Over time the error margin will increase.
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100% means, that the capacity related values are basically
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completely useless.
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Access: Read
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Valid values: 0 - 100 (percent)
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What: /sys/class/power_supply/<supply_name>/capacity_level
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Date: June 2009
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Contact: linux-pm@vger.kernel.org
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Description:
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Coarse representation of battery capacity.
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Access: Read
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Valid values:
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"Unknown", "Critical", "Low", "Normal", "High",
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"Full"
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What: /sys/class/power_supply/<supply_name>/charge_control_limit
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Date: Oct 2012
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Contact: linux-pm@vger.kernel.org
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Description:
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Maximum allowable charging current. Used for charge rate
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throttling for thermal cooling or improving battery health.
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Access: Read, Write
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Valid values: Represented in microamps
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What: /sys/class/power_supply/<supply_name>/charge_control_limit_max
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Date: Oct 2012
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Contact: linux-pm@vger.kernel.org
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Description:
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Maximum legal value for the charge_control_limit property.
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Access: Read
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Valid values: Represented in microamps
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What: /sys/class/power_supply/<supply_name>/charge_control_start_threshold
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Date: April 2019
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Contact: linux-pm@vger.kernel.org
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Description:
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Represents a battery percentage level, below which charging will
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begin.
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Access: Read, Write
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Valid values: 0 - 100 (percent)
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What: /sys/class/power_supply/<supply_name>/charge_control_end_threshold
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Date: April 2019
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Contact: linux-pm@vger.kernel.org
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Description:
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Represents a battery percentage level, above which charging will
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stop. Not all hardware is capable of setting this to an arbitrary
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percentage. Drivers will round written values to the nearest
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supported value. Reading back the value will show the actual
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threshold set by the driver.
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Access: Read, Write
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Valid values: 0 - 100 (percent)
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What: /sys/class/power_supply/<supply_name>/charge_type
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Date: July 2009
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Contact: linux-pm@vger.kernel.org
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Description:
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Represents the type of charging currently being applied to the
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battery. "Trickle", "Fast", and "Standard" all mean different
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charging speeds. "Adaptive" means that the charger uses some
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algorithm to adjust the charge rate dynamically, without
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any user configuration required. "Custom" means that the charger
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uses the charge_control_* properties as configuration for some
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different algorithm. "Long Life" means the charger reduces its
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charging rate in order to prolong the battery health. "Bypass"
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means the charger bypasses the charging path around the
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integrated converter allowing for a "smart" wall adaptor to
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perform the power conversion externally.
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Access: Read, Write
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Valid values:
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"Unknown", "N/A", "Trickle", "Fast", "Standard",
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"Adaptive", "Custom", "Long Life", "Bypass"
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What: /sys/class/power_supply/<supply_name>/charge_term_current
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Date: July 2014
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Contact: linux-pm@vger.kernel.org
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Description:
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Reports the charging current value which is used to determine
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when the battery is considered full and charging should end.
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Access: Read
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Valid values: Represented in microamps
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What: /sys/class/power_supply/<supply_name>/health
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Date: May 2007
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Contact: linux-pm@vger.kernel.org
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Description:
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Reports the health of the battery or battery side of charger
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functionality.
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Access: Read
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Valid values:
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"Unknown", "Good", "Overheat", "Dead",
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"Over voltage", "Unspecified failure", "Cold",
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"Watchdog timer expire", "Safety timer expire",
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"Over current", "Calibration required", "Warm",
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"Cool", "Hot", "No battery"
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What: /sys/class/power_supply/<supply_name>/precharge_current
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Date: June 2017
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Contact: linux-pm@vger.kernel.org
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Description:
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Reports the charging current applied during pre-charging phase
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for a battery charge cycle.
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Access: Read
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Valid values: Represented in microamps
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What: /sys/class/power_supply/<supply_name>/present
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Date: May 2007
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Contact: linux-pm@vger.kernel.org
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Description:
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Reports whether a battery is present or not in the system. If the
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property does not exist, the battery is considered to be present.
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Access: Read
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Valid values:
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== =======
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0: Absent
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1: Present
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== =======
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What: /sys/class/power_supply/<supply_name>/status
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Date: May 2007
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Contact: linux-pm@vger.kernel.org
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Description:
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Represents the charging status of the battery. Normally this
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is read-only reporting although for some supplies this can be
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used to enable/disable charging to the battery.
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Access: Read, Write
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Valid values:
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"Unknown", "Charging", "Discharging",
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"Not charging", "Full"
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What: /sys/class/power_supply/<supply_name>/charge_behaviour
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Date: November 2021
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Contact: linux-pm@vger.kernel.org
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Description:
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Represents the charging behaviour.
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Access: Read, Write
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Valid values:
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================ ====================================
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auto: Charge normally, respect thresholds
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inhibit-charge: Do not charge while AC is attached
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force-discharge: Force discharge while AC is attached
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================ ====================================
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What: /sys/class/power_supply/<supply_name>/technology
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Date: May 2007
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Contact: linux-pm@vger.kernel.org
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Description:
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Describes the battery technology supported by the supply.
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Access: Read
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Valid values:
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"Unknown", "NiMH", "Li-ion", "Li-poly", "LiFe",
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"NiCd", "LiMn"
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What: /sys/class/power_supply/<supply_name>/voltage_avg,
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Date: May 2007
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Contact: linux-pm@vger.kernel.org
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Description:
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Reports an average VBAT voltage reading for the battery, over a
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fixed period. Normally devices will provide a fixed interval in
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which they average readings to smooth out the reported value.
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Access: Read
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Valid values: Represented in microvolts
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What: /sys/class/power_supply/<supply_name>/cycle_count
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Date: January 2010
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Contact: linux-pm@vger.kernel.org
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Description:
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Reports the number of full charge + discharge cycles the
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battery has undergone.
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Access: Read
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Valid values:
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Integer > 0: representing full cycles
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Integer = 0: cycle_count info is not available
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**USB Properties**
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What: /sys/class/power_supply/<supply_name>/input_current_limit
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Date: July 2014
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Contact: linux-pm@vger.kernel.org
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Description:
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Details the incoming IBUS current limit currently set in the
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supply. Normally this is configured based on the type of
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connection made (e.g. A configured SDP should output a maximum
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of 500mA so the input current limit is set to the same value).
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Use preferably input_power_limit, and for problems that can be
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solved using power limit use input_current_limit.
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Access: Read, Write
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Valid values: Represented in microamps
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What: /sys/class/power_supply/<supply_name>/input_voltage_limit
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Date: May 2019
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Contact: linux-pm@vger.kernel.org
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Description:
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This entry configures the incoming VBUS voltage limit currently
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set in the supply. Normally this is configured based on
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system-level knowledge or user input (e.g. This is part of the
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Pixel C's thermal management strategy to effectively limit the
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input power to 5V when the screen is on to meet Google's skin
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temperature targets). Note that this feature should not be
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used for safety critical things.
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Use preferably input_power_limit, and for problems that can be
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solved using power limit use input_voltage_limit.
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Access: Read, Write
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Valid values: Represented in microvolts
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What: /sys/class/power_supply/<supply_name>/input_power_limit
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Date: May 2019
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Contact: linux-pm@vger.kernel.org
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Description:
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This entry configures the incoming power limit currently set
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in the supply. Normally this is configured based on
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system-level knowledge or user input. Use preferably this
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feature to limit the incoming power and use current/voltage
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limit only for problems that can be solved using power limit.
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Access: Read, Write
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Valid values: Represented in microwatts
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What: /sys/class/power_supply/<supply_name>/online,
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Date: May 2007
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Contact: linux-pm@vger.kernel.org
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Description:
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Indicates if VBUS is present for the supply. When the supply is
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online, and the supply allows it, then it's possible to switch
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between online states (e.g. Fixed -> Programmable for a PD_PPS
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USB supply so voltage and current can be controlled).
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Access: Read, Write
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Valid values:
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== ==================================================
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0: Offline
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1: Online Fixed - Fixed Voltage Supply
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2: Online Programmable - Programmable Voltage Supply
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== ==================================================
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What: /sys/class/power_supply/<supply_name>/usb_type
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Date: March 2018
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Contact: linux-pm@vger.kernel.org
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Description:
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Reports what type of USB connection is currently active for
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the supply, for example it can show if USB-PD capable source
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is attached.
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Access: Read-Only
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Valid values:
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"Unknown", "SDP", "DCP", "CDP", "ACA", "C", "PD",
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"PD_DRP", "PD_PPS", "BrickID"
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**Device Specific Properties**
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What: /sys/class/power/ds2760-battery.*/charge_now
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Date: May 2010
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KernelVersion: 2.6.35
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Contact: Daniel Mack <daniel@caiaq.de>
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Description:
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This file is writeable and can be used to set the current
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coloumb counter value inside the battery monitor chip. This
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is needed for unavoidable corrections of aging batteries.
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A userspace daemon can monitor the battery charging logic
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and once the counter drops out of considerable bounds, take
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appropriate action.
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What: /sys/class/power/ds2760-battery.*/charge_full
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Date: May 2010
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KernelVersion: 2.6.35
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Contact: Daniel Mack <daniel@caiaq.de>
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Description:
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This file is writeable and can be used to set the assumed
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battery 'full level'. As batteries age, this value has to be
|
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amended over time.
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What: /sys/class/power_supply/max14577-charger/device/fast_charge_timer
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Date: October 2014
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KernelVersion: 3.18.0
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Contact: Krzysztof Kozlowski <krzk@kernel.org>
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Description:
|
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This entry shows and sets the maximum time the max14577
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charger operates in fast-charge mode. When the timer expires
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the device will terminate fast-charge mode (charging current
|
|
will drop to 0 A) and will trigger interrupt.
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|
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Valid values:
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- 5, 6 or 7 (hours),
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- 0: disabled.
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What: /sys/class/power_supply/max77693-charger/device/fast_charge_timer
|
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Date: January 2015
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KernelVersion: 3.19.0
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Contact: Krzysztof Kozlowski <krzk@kernel.org>
|
|
Description:
|
|
This entry shows and sets the maximum time the max77693
|
|
charger operates in fast-charge mode. When the timer expires
|
|
the device will terminate fast-charge mode (charging current
|
|
will drop to 0 A) and will trigger interrupt.
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|
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Valid values:
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- 4 - 16 (hours), step by 2 (rounded down)
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- 0: disabled.
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What: /sys/class/power_supply/max77693-charger/device/top_off_threshold_current
|
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Date: January 2015
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KernelVersion: 3.19.0
|
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Contact: Krzysztof Kozlowski <krzk@kernel.org>
|
|
Description:
|
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This entry shows and sets the charging current threshold for
|
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entering top-off charging mode. When charging current in fast
|
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charge mode drops below this value, the charger will trigger
|
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interrupt and start top-off charging mode.
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|
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Valid values:
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- 100000 - 200000 (microamps), step by 25000 (rounded down)
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- 200000 - 350000 (microamps), step by 50000 (rounded down)
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- 0: disabled.
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|
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What: /sys/class/power_supply/max77693-charger/device/top_off_timer
|
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Date: January 2015
|
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KernelVersion: 3.19.0
|
|
Contact: Krzysztof Kozlowski <krzk@kernel.org>
|
|
Description:
|
|
This entry shows and sets the maximum time the max77693
|
|
charger operates in top-off charge mode. When the timer expires
|
|
the device will terminate top-off charge mode (charging current
|
|
will drop to 0 A) and will trigger interrupt.
|
|
|
|
Valid values:
|
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|
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- 0 - 70 (minutes), step by 10 (rounded down)
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|
|
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What: /sys/class/power_supply/bq24257-charger/ovp_voltage
|
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Date: October 2015
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KernelVersion: 4.4.0
|
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Contact: Andreas Dannenberg <dannenberg@ti.com>
|
|
Description:
|
|
This entry configures the overvoltage protection feature of bq24257-
|
|
type charger devices. This feature protects the device and other
|
|
components against damage from overvoltage on the input supply. See
|
|
device datasheet for details.
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|
|
|
Valid values:
|
|
|
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- 6000000, 6500000, 7000000, 8000000, 9000000, 9500000, 10000000,
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10500000 (all uV)
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|
|
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What: /sys/class/power_supply/bq24257-charger/in_dpm_voltage
|
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Date: October 2015
|
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KernelVersion: 4.4.0
|
|
Contact: Andreas Dannenberg <dannenberg@ti.com>
|
|
Description:
|
|
This entry configures the input dynamic power path management voltage of
|
|
bq24257-type charger devices. Once the supply drops to the configured
|
|
voltage, the input current limit is reduced down to prevent the further
|
|
drop of the supply. When the IC enters this mode, the charge current is
|
|
lower than the set value. See device datasheet for details.
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|
|
|
Valid values:
|
|
|
|
- 4200000, 4280000, 4360000, 4440000, 4520000, 4600000, 4680000,
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|
4760000 (all uV)
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|
|
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What: /sys/class/power_supply/bq24257-charger/high_impedance_enable
|
|
Date: October 2015
|
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KernelVersion: 4.4.0
|
|
Contact: Andreas Dannenberg <dannenberg@ti.com>
|
|
Description:
|
|
This entry allows enabling the high-impedance mode of bq24257-type
|
|
charger devices. If enabled, it places the charger IC into low power
|
|
standby mode with the switch mode controller disabled. When disabled,
|
|
the charger operates normally. See device datasheet for details.
|
|
|
|
Valid values:
|
|
|
|
- 1: enabled
|
|
- 0: disabled
|
|
|
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What: /sys/class/power_supply/bq24257-charger/sysoff_enable
|
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Date: October 2015
|
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KernelVersion: 4.4.0
|
|
Contact: Andreas Dannenberg <dannenberg@ti.com>
|
|
Description:
|
|
This entry allows enabling the sysoff mode of bq24257-type charger
|
|
devices. If enabled and the input is removed, the internal battery FET
|
|
is turned off in order to reduce the leakage from the BAT pin to less
|
|
than 1uA. Note that on some devices/systems this disconnects the battery
|
|
from the system. See device datasheet for details.
|
|
|
|
Valid values:
|
|
|
|
- 1: enabled
|
|
- 0: disabled
|
|
|
|
What: /sys/class/power_supply/<supply_name>/manufacture_year
|
|
Date: January 2020
|
|
Contact: linux-pm@vger.kernel.org
|
|
Description:
|
|
Reports the year (following Gregorian calendar) when the device has been
|
|
manufactured.
|
|
|
|
Access: Read
|
|
|
|
Valid values: Reported as integer
|
|
|
|
What: /sys/class/power_supply/<supply_name>/manufacture_month
|
|
Date: January 2020
|
|
Contact: linux-pm@vger.kernel.org
|
|
Description:
|
|
Reports the month when the device has been manufactured.
|
|
|
|
Access: Read
|
|
|
|
Valid values: 1-12
|
|
|
|
What: /sys/class/power_supply/<supply_name>/manufacture_day
|
|
Date: January 2020
|
|
Contact: linux-pm@vger.kernel.org
|
|
Description:
|
|
Reports the day of month when the device has been manufactured.
|
|
|
|
Access: Read
|
|
Valid values: 1-31
|