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iio: Implement counter channel type and info constants

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Quadrature encoders, such as rotary encoders and linear encoders, are
devices which are capable of encoding the relative position and
direction of motion of a shaft. This patch introduces several IIO
constants for supporting quadrature encoder counter devices.

  IIO_COUNT: Current count (main data provided by the counter device)
  IIO_INDEX: Counter device index value

Signed-off-by: William Breathitt Gray <vilhelm.gray@gmail.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
William Breathitt Gray 2016-09-28 13:59:49 -04:00 committed by Jonathan Cameron
parent 9ecca12edd
commit 1a8f324aa1
3 changed files with 22 additions and 0 deletions
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18
Documentation/ABI/testing/sysfs-bus-iio
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@ -329,6 +329,7 @@ What: /sys/bus/iio/devices/iio:deviceX/in_pressure_scale
What: /sys/bus/iio/devices/iio:deviceX/in_humidityrelative_scale
What: /sys/bus/iio/devices/iio:deviceX/in_velocity_sqrt(x^2+y^2+z^2)_scale
What: /sys/bus/iio/devices/iio:deviceX/in_illuminance_scale
What: /sys/bus/iio/devices/iio:deviceX/in_countY_scale
KernelVersion: 2.6.35
Contact: linux-iio@vger.kernel.org
Description:
@ -1579,3 +1580,20 @@ Contact: linux-iio@vger.kernel.org
Description:
Raw (unscaled no offset etc.) electric conductivity reading that
can be processed to siemens per meter.
What: /sys/bus/iio/devices/iio:deviceX/in_countY_raw
KernelVersion: 4.9
Contact: linux-iio@vger.kernel.org
Description:
Raw counter device counts from channel Y. For quadrature
counters, multiplication by an available [Y]_scale results in
the counts of a single quadrature signal phase from channel Y.
What: /sys/bus/iio/devices/iio:deviceX/in_indexY_raw
KernelVersion: 4.9
Contact: linux-iio@vger.kernel.org
Description:
Raw counter device index value from channel Y. This attribute
provides an absolute positional reference (e.g. a pulse once per
revolution) which may be used to home positional systems as
required.

2
drivers/iio/industrialio-core.c
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@ -81,6 +81,8 @@ static const char * const iio_chan_type_name_spec[] = {
[IIO_PH] = "ph",
[IIO_UVINDEX] = "uvindex",
[IIO_ELECTRICALCONDUCTIVITY] = "electricalconductivity",
[IIO_COUNT] = "count",
[IIO_INDEX] = "index",
};
static const char * const iio_modifier_names[] = {

2
include/uapi/linux/iio/types.h
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@ -40,6 +40,8 @@ enum iio_chan_type {
IIO_PH,
IIO_UVINDEX,
IIO_ELECTRICALCONDUCTIVITY,
IIO_COUNT,
IIO_INDEX,
};
enum iio_modifier {