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Nicolin Chen 2057bdfb71 hwmon: (ina3221) Add summation feature support 
This patch implements the summation feature of INA3221, mainly the
SCC (enabling) and SF (warning flag) bits of MASK_ENABLE register,
INA3221_SHUNT_SUM (summation of shunt voltages) register, and the
INA3221_CRIT_SUM (its critical alert setting) register.

Although the summation feature allows user to select which channels
to be added to the result, as an initial support, this patch simply
selects all channels by default, with one only condition: all shunt
resistor values need to be the same. This is because the summation
of current channels can be only accurately calculated, using shunt
voltage sum register, if all shunt resistors are equivalent.

Signed-off-by: Nicolin Chen <nicoleotsuka@gmail.com>
Link: https://lore.kernel.org/r/20191016235702.22039-1-nicoleotsuka@gmail.com
[groeck: summation->sum in documentation and label]
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
2019-11-06 14:37:19 -08:00
..
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adm1021.rst docs: i2c: convert to ReST and add to driver-api bookset 2019-07-31 13:25:27 -06:00
adm1025.rst docs: hwmon: Add an index file and rename docs to *.rst 2019-04-17 10:37:23 -07:00
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adm1275.rst docs: i2c: convert to ReST and add to driver-api bookset 2019-07-31 13:25:27 -06:00
adm9240.rst docs: hwmon: Add an index file and rename docs to *.rst 2019-04-17 10:37:23 -07:00
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coretemp.rst docs: hwmon: Add an index file and rename docs to *.rst 2019-04-17 10:37:23 -07:00
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hih6130.rst docs: i2c: convert to ReST and add to driver-api bookset 2019-07-31 13:25:27 -06:00
hwmon-kernel-api.rst docs: hwmon: Add an index file and rename docs to *.rst 2019-04-17 10:37:23 -07:00
ibm-cffps.rst docs: i2c: convert to ReST and add to driver-api bookset 2019-07-31 13:25:27 -06:00
ibmaem.rst docs: hwmon: Add an index file and rename docs to *.rst 2019-04-17 10:37:23 -07:00
ibmpowernv.rst docs: hwmon: Add an index file and rename docs to *.rst 2019-04-17 10:37:23 -07:00
ina2xx.rst docs: hwmon: Add an index file and rename docs to *.rst 2019-04-17 10:37:23 -07:00
ina209.rst docs: hwmon: Add an index file and rename docs to *.rst 2019-04-17 10:37:23 -07:00
ina3221.rst hwmon: (ina3221) Add summation feature support 2019-11-06 14:37:19 -08:00
index.rst docs: hwmon: Include 'inspur-ipsps1.rst' into docs 2019-10-02 06:40:29 -07:00
inspur-ipsps1.rst hwmon: docs: Extend inspur-ipsps1 title underline 2019-10-07 05:56:57 -07:00
ir35221.rst docs: hwmon: Add an index file and rename docs to *.rst 2019-04-17 10:37:23 -07:00
ir38064.rst docs: hwmon: convert three docs to ReST format 2019-04-22 15:27:27 -07:00
isl68137.rst docs: hwmon: convert three docs to ReST format 2019-04-22 15:27:27 -07:00
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jc42.rst docs: hwmon: Add an index file and rename docs to *.rst 2019-04-17 10:37:23 -07:00
k8temp.rst hwmon: (k8temp) documentation: update URL of datasheet 2019-07-21 19:18:45 -07:00
k10temp.rst hwmon: (k10temp) Update documentation and add temp2_input info 2019-10-02 06:35:57 -07:00
lineage-pem.rst docs: hwmon: Add an index file and rename docs to *.rst 2019-04-17 10:37:23 -07:00
lm63.rst docs: hwmon: Add an index file and rename docs to *.rst 2019-04-17 10:37:23 -07:00
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lm75.rst hwmon: (lm75) add support for PCT2075 2019-09-03 12:47:17 -07:00
lm77.rst docs: hwmon: Add an index file and rename docs to *.rst 2019-04-17 10:37:23 -07:00
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lm25066.rst docs: i2c: convert to ReST and add to driver-api bookset 2019-07-31 13:25:27 -06:00
lm95234.rst docs: hwmon: Add an index file and rename docs to *.rst 2019-04-17 10:37:23 -07:00
lm95245.rst docs: hwmon: Add an index file and rename docs to *.rst 2019-04-17 10:37:23 -07:00
lochnagar.rst docs: hwmon: convert three docs to ReST format 2019-04-22 15:27:27 -07:00
ltc2945.rst docs: hwmon: Add an index file and rename docs to *.rst 2019-04-17 10:37:23 -07:00
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max6650.rst docs: i2c: convert to ReST and add to driver-api bookset 2019-07-31 13:25:27 -06:00
max6697.rst docs: hwmon: Add an index file and rename docs to *.rst 2019-04-17 10:37:23 -07:00
max8688.rst docs: i2c: convert to ReST and add to driver-api bookset 2019-07-31 13:25:27 -06:00
max16064.rst docs: i2c: convert to ReST and add to driver-api bookset 2019-07-31 13:25:27 -06:00
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max31722.rst docs: hwmon: Add an index file and rename docs to *.rst 2019-04-17 10:37:23 -07:00
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max34440.rst docs: i2c: convert to ReST and add to driver-api bookset 2019-07-31 13:25:27 -06:00
mc13783-adc.rst docs: hwmon: Add an index file and rename docs to *.rst 2019-04-17 10:37:23 -07:00
mcp3021.rst docs: hwmon: Add an index file and rename docs to *.rst 2019-04-17 10:37:23 -07:00
menf21bmc.rst docs: i2c: convert to ReST and add to driver-api bookset 2019-07-31 13:25:27 -06:00
mlxreg-fan.rst docs: hwmon: Add an index file and rename docs to *.rst 2019-04-17 10:37:23 -07:00
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pcf8591.rst docs: i2c: convert to ReST and add to driver-api bookset 2019-07-31 13:25:27 -06:00
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pxe1610.rst docs: hwmon: pxe1610: convert to ReST format and add to the index 2019-09-03 12:47:17 -07:00
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sht3x.rst docs: i2c: convert to ReST and add to driver-api bookset 2019-07-31 13:25:27 -06:00
sht15.rst docs: hwmon: Add an index file and rename docs to *.rst 2019-04-17 10:37:23 -07:00
sht21.rst docs: hwmon: Add an index file and rename docs to *.rst 2019-04-17 10:37:23 -07:00
shtc1.rst It's a somewhat calmer cycle for docs this time, as the churn of the mass 2019-09-17 16:22:26 -07:00
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submitting-patches.rst hwmon: submitting-patches: Add note on comment style 2019-09-13 05:43:06 -07:00
sysfs-interface.rst docs: hwmon: Add an index file and rename docs to *.rst 2019-04-17 10:37:23 -07:00
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