Add test script for adt7462 driver

Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Add test script for adt7470 driver

Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Add 'getval' command

getval displays either the value from a sysfs attribute,
or if reading that sysfs attribute returns an error,
the error number. exit code is 0 in the first case,
1 in case of an error.

Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Add error_test function

Signed-off-by: Guenter Roeck <linux@roeck-us.net>
sht21.sh: Add error test

Signed-off-by: Guenter Roeck <linux@roeck-us.net>
nct7802.sh: Add multi-bank test

Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Add test script for thmc50 driver

Signed-off-by: Guenter Roeck <linux@roeck-us.net>