linux/drivers/iio/Kconfig
Matti Vaittinen 38416c28e1 iio: light: Add gain-time-scale helpers
Some light sensors can adjust both the HW-gain and integration time.
There are cases where adjusting the integration time has similar impact
to the scale of the reported values as gain setting has.

IIO users do typically expect to handle scale by a single writable 'scale'
entry. Driver should then adjust the gain/time accordingly.

It however is difficult for a driver to know whether it should change
gain or integration time to meet the requested scale. Usually it is
preferred to have longer integration time which usually improves
accuracy, but there may be use-cases where long measurement times can be
an issue. Thus it can be preferable to allow also changing the
integration time - but mitigate the scale impact by also changing the gain
underneath. Eg, if integration time change doubles the measured values,
the driver can reduce the HW-gain to half.

The theory of the computations of gain-time-scale is simple. However,
some people (undersigned) got that implemented wrong for more than once.

Add some gain-time-scale helpers in order to not dublicate errors in all
drivers needing these computations.

Signed-off-by: Matti Vaittinen <mazziesaccount@gmail.com>
Link: https://lore.kernel.org/r/268d418e7cffcdaa2ece6738478bbc57692c213e.1680263956.git.mazziesaccount@gmail.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
2023-04-10 12:26:34 +01:00

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# SPDX-License-Identifier: GPL-2.0-only
#
# Industrial I/O subsystem configuration
#
menuconfig IIO
tristate "Industrial I/O support"
help
The industrial I/O subsystem provides a unified framework for
drivers for many different types of embedded sensors using a
number of different physical interfaces (i2c, spi, etc).
if IIO
config IIO_BUFFER
bool "Enable buffer support within IIO"
help
Provide core support for various buffer based data
acquisition methods.
if IIO_BUFFER
source "drivers/iio/buffer/Kconfig"
endif # IIO_BUFFER
config IIO_CONFIGFS
tristate "Enable IIO configuration via configfs"
select CONFIGFS_FS
help
This allows configuring various IIO bits through configfs
(e.g. software triggers). For more info see
Documentation/iio/iio_configfs.rst.
config IIO_GTS_HELPER
tristate
config IIO_TRIGGER
bool "Enable triggered sampling support"
help
Provides IIO core support for triggers. Currently these
are used to initialize capture of samples to push into
buffers. The triggers are effectively a 'capture
data now' interrupt.
config IIO_CONSUMERS_PER_TRIGGER
int "Maximum number of consumers per trigger"
depends on IIO_TRIGGER
default "2"
help
This value controls the maximum number of consumers that a
given trigger may handle. Default is 2.
config IIO_SW_DEVICE
tristate "Enable software IIO device support"
select IIO_CONFIGFS
help
Provides IIO core support for software devices. A software
device can be created via configfs or directly by a driver
using the API provided.
config IIO_SW_TRIGGER
tristate "Enable software triggers support"
select IIO_CONFIGFS
help
Provides IIO core support for software triggers. A software
trigger can be created via configfs or directly by a driver
using the API provided.
config IIO_TRIGGERED_EVENT
tristate "Enable triggered events support"
select IIO_TRIGGER
help
Provides helper functions for setting up triggered events.
source "drivers/iio/accel/Kconfig"
source "drivers/iio/adc/Kconfig"
source "drivers/iio/addac/Kconfig"
source "drivers/iio/afe/Kconfig"
source "drivers/iio/amplifiers/Kconfig"
source "drivers/iio/cdc/Kconfig"
source "drivers/iio/chemical/Kconfig"
source "drivers/iio/common/Kconfig"
source "drivers/iio/dac/Kconfig"
source "drivers/iio/dummy/Kconfig"
source "drivers/iio/filter/Kconfig"
source "drivers/iio/frequency/Kconfig"
source "drivers/iio/gyro/Kconfig"
source "drivers/iio/health/Kconfig"
source "drivers/iio/humidity/Kconfig"
source "drivers/iio/imu/Kconfig"
source "drivers/iio/light/Kconfig"
source "drivers/iio/magnetometer/Kconfig"
source "drivers/iio/multiplexer/Kconfig"
source "drivers/iio/orientation/Kconfig"
source "drivers/iio/test/Kconfig"
if IIO_TRIGGER
source "drivers/iio/trigger/Kconfig"
endif #IIO_TRIGGER
source "drivers/iio/position/Kconfig"
source "drivers/iio/potentiometer/Kconfig"
source "drivers/iio/potentiostat/Kconfig"
source "drivers/iio/pressure/Kconfig"
source "drivers/iio/proximity/Kconfig"
source "drivers/iio/resolver/Kconfig"
source "drivers/iio/temperature/Kconfig"
endif # IIO