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Message-ID: <20240415081305.316107-3-mike.looijmans@topic.nl>
Date: Mon, 15 Apr 2024 10:13:03 +0200
From: Mike Looijmans <mike.looijmans@...ic.nl>
To: linux-pm@...r.kernel.org
CC: Mike Looijmans <mike.looijmans@...ic.nl>,
Len Brown <len.brown@...el.com>,
Pavel Machek <pavel@....cz>,
"Rafael J. Wysocki" <rafael@...nel.org>,
Sebastian Reichel <sre@...nel.org>,
linux-kernel@...r.kernel.org
Subject: [PATCH v4 3/5] power: supply: core: Add POWER_SUPPLY_PROP_*CELL* entries
For multi-cell chargers (or stacks of capacitors), allow to report the
number of cells in series and the voltage of each cell.
Signed-off-by: Mike Looijmans <mike.looijmans@...ic.nl>
---
(no changes since v1)
Documentation/ABI/testing/sysfs-class-power | 51 +++++++++++++++++++++
Documentation/power/power_supply_class.rst | 7 +++
drivers/power/supply/power_supply_sysfs.c | 7 +++
include/linux/power_supply.h | 7 +++
4 files changed, 72 insertions(+)
diff --git a/Documentation/ABI/testing/sysfs-class-power b/Documentation/ABI/testing/sysfs-class-power
index 1f6a04a17c81..f5b194ad61b3 100644
--- a/Documentation/ABI/testing/sysfs-class-power
+++ b/Documentation/ABI/testing/sysfs-class-power
@@ -516,6 +516,57 @@ Description:
Integer > 0: representing full cycles
Integer = 0: cycle_count info is not available
+What: /sys/class/power_supply/<supply_name>/number_of_serial_cells
+Date: April 2024
+Contact: linux-pm@...r.kernel.org
+Description:
+ If the energy storage is composed of multiple cells in series,
+ this provides the number of stacked cells. Parallel cells aren't
+ considered here.
+
+ Access: Read
+
+ Valid values:
+ Integer > 0: number of cells
+ Integer = 0: info is not available
+
+What: /sys/class/power_supply/<supply_name>/cell1_voltage_now
+Date: April 2024
+Contact: linux-pm@...r.kernel.org
+Description:
+ Reports an instant, single cell voltage reading. The voltage is
+ measured across the cell. The battery reports voltages for up to
+ 'number_of_serial_cells' cells, in cell2_voltage_now and so on.
+
+ Access: Read
+
+ Valid values: Represented in microvolts
+
+What: /sys/class/power_supply/<supply_name>/cell_voltage_max
+Date: April 2024
+Contact: linux-pm@...r.kernel.org
+Description:
+ Maximum allowed voltage for a single cell. This value is shared
+ across all cells in the range 1 to 'number_of_serial_cells'.
+ Typically used to trigger an alert for userspace.
+
+ Access: Read, Write
+
+ Valid values: Represented in microvolts
+
+What: /sys/class/power_supply/<supply_name>/cell_voltage_min
+Date: April 2024
+Contact: linux-pm@...r.kernel.org
+Description:
+ Minimum allowed voltage for a single cell. This value is shared
+ across all cells in the range 1 to 'number_of_serial_cells'.
+ Typically used to trigger an alert for userspace.
+
+ Access: Read, Write
+
+ Valid values: Represented in microvolts
+
+
**USB Properties**
What: /sys/class/power_supply/<supply_name>/input_current_limit
diff --git a/Documentation/power/power_supply_class.rst b/Documentation/power/power_supply_class.rst
index da8e275a14ff..42110cbbea4a 100644
--- a/Documentation/power/power_supply_class.rst
+++ b/Documentation/power/power_supply_class.rst
@@ -213,6 +213,13 @@ TIME_TO_FULL
seconds left for battery to be considered full
(i.e. while battery is charging)
+NUMBER_OF_SERIAL_CELLS
+ If the energy storage is composed of multiple cells in series, this provides
+ the number of stacked cells. Parallel cells aren't considered here.
+CELLn_VOLTAGE
+ voltage measured of the n-th cell in the stack
+CELL_VOLTAGE
+ single cell voltage when the cells share the same value (usually MIN or MAX)
Battery <-> external power supply interaction
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
diff --git a/drivers/power/supply/power_supply_sysfs.c b/drivers/power/supply/power_supply_sysfs.c
index 9d8540ce1f7e..4ea6b556f3fd 100644
--- a/drivers/power/supply/power_supply_sysfs.c
+++ b/drivers/power/supply/power_supply_sysfs.c
@@ -218,6 +218,13 @@ static struct power_supply_attr power_supply_attrs[] = {
POWER_SUPPLY_ATTR(MANUFACTURE_YEAR),
POWER_SUPPLY_ATTR(MANUFACTURE_MONTH),
POWER_SUPPLY_ATTR(MANUFACTURE_DAY),
+ POWER_SUPPLY_ATTR(NUMBER_OF_SERIAL_CELLS),
+ POWER_SUPPLY_ATTR(CELL1_VOLTAGE_NOW),
+ POWER_SUPPLY_ATTR(CELL2_VOLTAGE_NOW),
+ POWER_SUPPLY_ATTR(CELL3_VOLTAGE_NOW),
+ POWER_SUPPLY_ATTR(CELL4_VOLTAGE_NOW),
+ POWER_SUPPLY_ATTR(CELL_VOLTAGE_MIN),
+ POWER_SUPPLY_ATTR(CELL_VOLTAGE_MAX),
/* Properties of type `const char *' */
POWER_SUPPLY_ATTR(MODEL_NAME),
POWER_SUPPLY_ATTR(MANUFACTURER),
diff --git a/include/linux/power_supply.h b/include/linux/power_supply.h
index af5a4e700881..3c208dff8af8 100644
--- a/include/linux/power_supply.h
+++ b/include/linux/power_supply.h
@@ -171,6 +171,13 @@ enum power_supply_property {
POWER_SUPPLY_PROP_MANUFACTURE_YEAR,
POWER_SUPPLY_PROP_MANUFACTURE_MONTH,
POWER_SUPPLY_PROP_MANUFACTURE_DAY,
+ POWER_SUPPLY_PROP_NUMBER_OF_SERIAL_CELLS,
+ POWER_SUPPLY_PROP_CELL1_VOLTAGE_NOW,
+ POWER_SUPPLY_PROP_CELL2_VOLTAGE_NOW,
+ POWER_SUPPLY_PROP_CELL3_VOLTAGE_NOW,
+ POWER_SUPPLY_PROP_CELL4_VOLTAGE_NOW,
+ POWER_SUPPLY_PROP_CELL_VOLTAGE_MIN,
+ POWER_SUPPLY_PROP_CELL_VOLTAGE_MAX,
/* Properties of type `const char *' */
POWER_SUPPLY_PROP_MODEL_NAME,
POWER_SUPPLY_PROP_MANUFACTURER,
--
2.34.1
Met vriendelijke groet / kind regards,
Mike Looijmans
System Expert
TOPIC Embedded Products B.V.
Materiaalweg 4, 5681 RJ Best
The Netherlands
T: +31 (0) 499 33 69 69
E: mike.looijmans@...ic.nl
W: www.topic.nl
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