summaryrefslogtreecommitdiffstats
path: root/Documentation/hwmon/ina3221.rst
diff options
context:
space:
mode:
Diffstat (limited to '')
-rw-r--r--Documentation/hwmon/ina3221.rst74
1 files changed, 74 insertions, 0 deletions
diff --git a/Documentation/hwmon/ina3221.rst b/Documentation/hwmon/ina3221.rst
new file mode 100644
index 0000000000..8c12c54d2c
--- /dev/null
+++ b/Documentation/hwmon/ina3221.rst
@@ -0,0 +1,74 @@
+Kernel driver ina3221
+=====================
+
+Supported chips:
+
+ * Texas Instruments INA3221
+
+ Prefix: 'ina3221'
+
+ Addresses: I2C 0x40 - 0x43
+
+ Datasheet: Publicly available at the Texas Instruments website
+
+ https://www.ti.com/
+
+Author: Andrew F. Davis <afd@ti.com>
+
+Description
+-----------
+
+The Texas Instruments INA3221 monitors voltage, current, and power on the high
+side of up to three D.C. power supplies. The INA3221 monitors both shunt drop
+and supply voltage, with programmable conversion times and averaging, current
+and power are calculated host-side from these.
+
+Sysfs entries
+-------------
+
+======================= =======================================================
+in[123]_label Voltage channel labels
+in[123]_enable Voltage channel enable controls
+in[123]_input Bus voltage(mV) channels
+curr[123]_input Current(mA) measurement channels
+shunt[123]_resistor Shunt resistance(uOhm) channels
+curr[123]_crit Critical alert current(mA) setting, activates the
+ corresponding alarm when the respective current
+ is above this value
+curr[123]_crit_alarm Critical alert current limit exceeded
+curr[123]_max Warning alert current(mA) setting, activates the
+ corresponding alarm when the respective current
+ average is above this value.
+curr[123]_max_alarm Warning alert current limit exceeded
+in[456]_input Shunt voltage(uV) for channels 1, 2, and 3 respectively
+in7_input Sum of shunt voltage(uV) channels
+in7_label Channel label for sum of shunt voltage
+curr4_input Sum of current(mA) measurement channels,
+ (only available when all channels use the same resistor
+ value for their shunt resistors)
+curr4_crit Critical alert current(mA) setting for sum of current
+ measurements, activates the corresponding alarm
+ when the respective current is above this value
+ (only effective when all channels use the same resistor
+ value for their shunt resistors)
+curr4_crit_alarm Critical alert current limit exceeded for sum of
+ current measurements.
+samples Number of samples using in the averaging mode.
+
+ Supports the list of number of samples:
+
+ 1, 4, 16, 64, 128, 256, 512, 1024
+
+update_interval Data conversion time in millisecond, following:
+
+ update_interval = C x S x (BC + SC)
+
+ * C: number of enabled channels
+ * S: number of samples
+ * BC: bus-voltage conversion time in millisecond
+ * SC: shunt-voltage conversion time in millisecond
+
+ Affects both Bus- and Shunt-voltage conversion time.
+ Note that setting update_interval to 0ms sets both BC
+ and SC to 140 us (minimum conversion time).
+======================= =======================================================