2019-11-12 22:30:01 +00:00
|
|
|
.. SPDX-License-Identifier: GPL-2.0
|
|
|
|
|
|
|
|
|
|
Kernel driver tmp513
|
|
|
|
|
====================
|
|
|
|
|
|
|
|
|
|
Supported chips:
|
|
|
|
|
|
|
|
|
|
* Texas Instruments TMP512
|
|
|
|
|
|
|
|
|
|
Prefix: 'tmp512'
|
|
|
|
|
|
2020-07-03 18:56:57 +00:00
|
|
|
Datasheet: https://www.ti.com/lit/ds/symlink/tmp512.pdf
|
2019-11-12 22:30:01 +00:00
|
|
|
|
|
|
|
|
* Texas Instruments TMP513
|
|
|
|
|
|
|
|
|
|
Prefix: 'tmp513'
|
|
|
|
|
|
2020-07-03 18:56:57 +00:00
|
|
|
Datasheet: https://www.ti.com/lit/ds/symlink/tmp513.pdf
|
2019-11-12 22:30:01 +00:00
|
|
|
|
|
|
|
|
Authors:
|
|
|
|
|
|
|
|
|
|
Eric Tremblay <etremblay@distech-controls.com>
|
|
|
|
|
|
|
|
|
|
Description
|
|
|
|
|
-----------
|
|
|
|
|
|
|
|
|
|
This driver implements support for Texas Instruments TMP512, and TMP513.
|
|
|
|
|
The TMP512 (dual-channel) and TMP513 (triple-channel) are system monitors
|
|
|
|
|
that include remote sensors, a local temperature sensor, and a high-side current
|
|
|
|
|
shunt monitor. These system monitors have the capability of measuring remote
|
|
|
|
|
temperatures, on-chip temperatures, and system voltage/power/current
|
|
|
|
|
consumption.
|
|
|
|
|
|
|
|
|
|
The temperatures are measured in degrees Celsius with a range of
|
|
|
|
|
-40 to + 125 degrees with a resolution of 0.0625 degree C.
|
|
|
|
|
|
|
|
|
|
For hysteresis value, only the first channel is writable. Writing to it
|
|
|
|
|
will affect all other values since each channels are sharing the same
|
|
|
|
|
hysteresis value. The hysteresis is in degrees Celsius with a range of
|
|
|
|
|
0 to 127.5 degrees with a resolution of 0.5 degree.
|
|
|
|
|
|
|
|
|
|
The driver exports the temperature values via the following sysfs files:
|
|
|
|
|
|
|
|
|
|
**temp[1-4]_input**
|
|
|
|
|
|
|
|
|
|
**temp[1-4]_crit**
|
|
|
|
|
|
|
|
|
|
**temp[1-4]_crit_alarm**
|
|
|
|
|
|
|
|
|
|
**temp[1-4]_crit_hyst**
|
|
|
|
|
|
|
|
|
|
The driver read the shunt voltage from the chip and convert it to current.
|
|
|
|
|
The readable range depends on the "ti,pga-gain" property (default to 8) and the
|
|
|
|
|
shunt resistor value. The value resolution will be equal to 10uV/Rshunt.
|
|
|
|
|
|
|
|
|
|
The driver exports the shunt currents values via the following sysFs files:
|
|
|
|
|
|
|
|
|
|
**curr1_input**
|
|
|
|
|
|
|
|
|
|
**curr1_lcrit**
|
|
|
|
|
|
|
|
|
|
**curr1_lcrit_alarm**
|
|
|
|
|
|
|
|
|
|
**curr1_crit**
|
|
|
|
|
|
|
|
|
|
**curr1_crit_alarm**
|
|
|
|
|
|
|
|
|
|
The bus voltage range is read from the chip with a resolution of 4mV. The chip
|
|
|
|
|
can be configurable in two different range (32V or 16V) using the
|
|
|
|
|
ti,bus-range-microvolt property in the devicetree.
|
|
|
|
|
|
|
|
|
|
The driver exports the bus voltage values via the following sysFs files:
|
|
|
|
|
|
|
|
|
|
**in0_input**
|
|
|
|
|
|
|
|
|
|
**in0_lcrit**
|
|
|
|
|
|
|
|
|
|
**in0_lcrit_alarm**
|
|
|
|
|
|
|
|
|
|
**in0_crit**
|
|
|
|
|
|
|
|
|
|
**in0_crit_alarm**
|
|
|
|
|
|
|
|
|
|
The bus power and bus currents range and resolution depends on the calibration
|
|
|
|
|
register value. Those values are calculate by the hardware using those
|
|
|
|
|
formulas:
|
|
|
|
|
|
|
|
|
|
Current = (ShuntVoltage * CalibrationRegister) / 4096
|
|
|
|
|
Power = (Current * BusVoltage) / 5000
|
|
|
|
|
|
|
|
|
|
The driver exports the bus current and bus power values via the following
|
|
|
|
|
sysFs files:
|
|
|
|
|
|
|
|
|
|
**curr2_input**
|
|
|
|
|
|
|
|
|
|
**power1_input**
|
|
|
|
|
|
|
|
|
|
**power1_crit**
|
|
|
|
|
|
|
|
|
|
**power1_crit_alarm**
|
|
|
|
|
|
|
|
|
|
The calibration process follow the procedure of the datasheet (without overflow)
|
|
|
|
|
and depend on the shunt resistor value and the pga_gain value.
|
