hwmon: (ina238) Rework and simplify temperature calculations

The temperature register is 16 bit wide for all chips. The decimal point
is at the same location (bit 7 = 1 degree C). That means we can use the
resolution to calculate temperatures. Do that to simplify the code.

There is only a single writeable temperature attribute, and it is very
unlikely that the chips supported by this driver will ever require another
one. That means checking for that attribute in the write function is
unnecessary.  Drop the check. Rename the write function from
ina238_write_temp() to ina238_write_temp_max() to reflect that a single
attribute is written.

Also extend the accepted temperature value range to the range supported by
the chip registers. Limiting the accepted value range to the temperature
range supported by the chip would make it impossible to read an
out-of-range limit from the chip and to write the same value back into it.
This is undesirable, especially since the maximum temperature register does
contain the maximum register value after a chip reset, not the temperature
limit supported by the chip.

Reviewed-by: Chris Packham <chris.packham@alliedtelesis.co.nz>
Tested-by: Chris Packham <chris.packham@alliedtelesis.co.nz> # INA780
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

0 files changed, 0 insertions, 0 deletions