From 1a8f324aa1f2237caef1c6633734785bbdcffeed Mon Sep 17 00:00:00 2001 From: William Breathitt Gray Date: Wed, 28 Sep 2016 13:59:49 -0400 Subject: iio: Implement counter channel type and info constants 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 Signed-off-by: Jonathan Cameron --- Documentation/ABI/testing/sysfs-bus-iio | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) (limited to 'Documentation/ABI/testing/sysfs-bus-iio') diff --git a/Documentation/ABI/testing/sysfs-bus-iio b/Documentation/ABI/testing/sysfs-bus-iio index fee35c00cc4e..b8f220f978dd 100644 --- a/Documentation/ABI/testing/sysfs-bus-iio +++ b/Documentation/ABI/testing/sysfs-bus-iio @@ -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. -- cgit