diff options
| author | Maciej Purski <m.purski@samsung.com> | 2017-12-18 09:43:58 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-01-08 16:03:42 +0100 |
| commit | a28caa7b8fe19ac2c31b7630772107e0d50ce18e (patch) | |
| tree | f7f4354c6d215542c99896b8701ddf8106f09d56 /drivers/iio/adc/bcm_iproc_adc.c | |
| parent | bbdcbd12a59a6306623ea5184e42a514e420b2e9 (diff) | |
iio: adc: ina2xx: Make calibration register value fixed
Calibration register is used for calculating current register in
hardware according to datasheet:
current = shunt_volt * calib_register / 2048 (ina 226)
current = shunt_volt * calib_register / 4096 (ina 219)
Fix calib_register value to 2048 for ina226 and 4096 for ina 219 in
order to avoid truncation error and provide best precision allowed
by shunt_voltage measurement. Make current scale value follow changes
of shunt_resistor from sysfs as calib_register value is now fixed.
Power_lsb value should also follow shunt_resistor changes as stated in
datasheet:
power_lsb = 25 * current_lsb (ina 226)
power_lsb = 20 * current_lsb (ina 219)
This is a part of the patchset: https://lkml.org/lkml/2017/11/22/394
Signed-off-by: Maciej Purski <m.purski@samsung.com>
Reviewed-by: Stefan Brüns <stefan.bruens@rwth-aachen.de>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/iio/adc/bcm_iproc_adc.c')
0 files changed, 0 insertions, 0 deletions