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| author | Luiz Sampaio <sampaio.ime@gmail.com> | 2021-05-19 19:30:46 -0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-05-21 14:51:33 +0200 |
| commit | c999fbbdcf778c2ea77f59e26d7448a1ab8fa8a2 (patch) | |
| tree | 5b34a7edafc482b89659100a27383abb748edfe5 /Documentation/ABI/stable | |
| parent | fd6ec5d79507f99639c94f107e8a98550c9e1cf6 (diff) | |
| download | linux-c999fbbdcf778c2ea77f59e26d7448a1ab8fa8a2.tar.gz | |
w1: ds2438: support for writing to offset register
Added a sysfs entry to support writing to the offset register on page1.
This register is used to calibrate the chip canceling offset errors in the
current ADC. This means that, over time, reading the IAD register will not
return the correct current measurement, it will have an offset. Writing to
the offset register if the two's complement of the current register while
passing zero current to the load will calibrate the measurements. This
change was tested on real hardware and it was able to calibrate the chip
correctly.
Signed-off-by: Luiz Sampaio <sampaio.ime@gmail.com>
Link: https://lore.kernel.org/r/20210519223046.13798-7-sampaio.ime@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'Documentation/ABI/stable')
| -rw-r--r-- | Documentation/ABI/stable/sysfs-driver-w1_ds2438 | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/Documentation/ABI/stable/sysfs-driver-w1_ds2438 b/Documentation/ABI/stable/sysfs-driver-w1_ds2438 index fa47437c11d98..d2e7681cc2873 100644 --- a/Documentation/ABI/stable/sysfs-driver-w1_ds2438 +++ b/Documentation/ABI/stable/sysfs-driver-w1_ds2438 @@ -4,3 +4,10 @@ Contact: Luiz Sampaio <sampaio.ime@gmail.com> Description: read the contents of the page1 of the DS2438 see Documentation/w1/slaves/w1_ds2438.rst for detailed information Users: any user space application which wants to communicate with DS2438 + +What: /sys/bus/w1/devices/.../offset +Date: April 2021 +Contact: Luiz Sampaio <sampaio.ime@gmail.com> +Description: write the contents to the offset register of the DS2438 + see Documentation/w1/slaves/w1_ds2438.rst for detailed information +Users: any user space application which wants to communicate with DS2438 |