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Documentation: ABI: testing: ad7192: update sysfs docs

Browse source 
Updated mainline documentation on ad7192 userspace sysfs.

Signed-off-by: Alexandru Tachici <alexandru.tachici@analog.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Alexandru Tachici 2020-02-12 18:17:20 +02:00 committed by Jonathan Cameron
parent 66614ab2be
commit 7e4d75935d
2 changed files with 18 additions and 26 deletions
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24
Documentation/ABI/testing/sysfs-bus-iio-adc-ad7192
View file

@ -2,17 +2,22 @@ What: /sys/bus/iio/devices/iio:deviceX/ac_excitation_en
KernelVersion:
Contact: linux-iio@vger.kernel.org
Description:
Reading gives the state of AC excitation.
Writing '1' enables AC excitation.
This attribute, if available, is used to enable the AC
excitation mode found on some converters. In ac excitation mode,
the polarity of the excitation voltage is reversed on
alternate cycles, to eliminate DC errors.
What: /sys/bus/iio/devices/iio:deviceX/bridge_switch_en
KernelVersion:
Contact: linux-iio@vger.kernel.org
Description:
This bridge switch is used to disconnect it when there is a
need to minimize the system current consumption.
Reading gives the state of the bridge switch.
Writing '1' enables the bridge switch.
This attribute, if available, is used to close or open the
bridge power down switch found on some converters.
In bridge applications, such as strain gauges and load cells,
the bridge itself consumes the majority of the current in the
system. To minimize the current consumption of the system,
the bridge can be disconnected (when it is not being used
using the bridge_switch_en attribute.
What: /sys/bus/iio/devices/iio:deviceX/in_voltagex_sys_calibration
KernelVersion:
@ -21,6 +26,13 @@ Description:
Initiates the system calibration procedure. This is done on a
single channel at a time. Write '1' to start the calibration.
What: /sys/bus/iio/devices/iio:deviceX/in_voltage2-voltage2_shorted_raw
KernelVersion:
Contact: linux-iio@vger.kernel.org
Description:
Measure voltage from AIN2 pin connected to AIN(+)
and AIN(-) shorted.
What: /sys/bus/iio/devices/iio:deviceX/in_voltagex_sys_calibration_mode_available
KernelVersion:
Contact: linux-iio@vger.kernel.org

20
drivers/staging/iio/Documentation/sysfs-bus-iio-ad7192
View file

@ -1,20 +0,0 @@
What: /sys/.../iio:deviceX/ac_excitation_en
KernelVersion: 3.1.0
Contact: linux-iio@vger.kernel.org
Description:
This attribute, if available, is used to enable the AC
excitation mode found on some converters. In ac excitation mode,
the polarity of the excitation voltage is reversed on
alternate cycles, to eliminate DC errors.
What: /sys/.../iio:deviceX/bridge_switch_en
KernelVersion: 3.1.0
Contact: linux-iio@vger.kernel.org
Description:
This attribute, if available, is used to close or open the
bridge power down switch found on some converters.
In bridge applications, such as strain gauges and load cells,
the bridge itself consumes the majority of the current in the
system. To minimize the current consumption of the system,
the bridge can be disconnected (when it is not being used
using the bridge_switch_en attribute.