On 21/09/16 21:15, William Breathitt Gray wrote:
> 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
> IIO_CHAN_INFO_PRESET: Counter preset value
>
> Signed-off-by: William Breathitt Gray <vilhelm.gray@xxxxxxxxx>
> ---
> Documentation/ABI/testing/sysfs-bus-iio | 28 ++++++++++++++++++++++++++++
> drivers/iio/industrialio-core.c | 3 +++
> include/linux/iio/iio.h | 1 +
> include/uapi/linux/iio/types.h | 2 ++
> 4 files changed, 34 insertions(+)
>
> diff --git a/Documentation/ABI/testing/sysfs-bus-iio b/Documentation/ABI/testing/sysfs-bus-iio
> index fee35c0..be66a41 100644
> --- a/Documentation/ABI/testing/sysfs-bus-iio
> +++ b/Documentation/ABI/testing/sysfs-bus-iio
> @@ -1579,3 +1579,31 @@ Contact: linux-iio@xxxxxxxxxxxxxxx
> 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@xxxxxxxxxxxxxxx
> +Description:
> + Raw counter device counts from channel Y. For quadrature
> + counters, division by an available [Y]_scale results in the
> + counts of a single quadrature signal phase from channel Y.
Division? Needs to be multiplication to be consistent with the other
interfaces.
> +
> +What: /sys/bus/iio/devices/iio:deviceX/in_countY_scale
> +KernelVersion: 4.9
> +Contact: linux-iio@xxxxxxxxxxxxxxx
> +Description:
> + If a scale value is available for channel Y, it is provided by
> + this attribute.
Can just add the What line to the big block of _scale attributes already
listed. Generic text should cover it fine.
> +
> +What: /sys/bus/iio/devices/iio:deviceX/in_countY_preset
> +KernelVersion: 4.9
> +Contact: linux-iio@xxxxxxxxxxxxxxx
> +Description:
> + If the counter device supports preset registers, the preset
> + count for channel Y is provided by this attribute.
> +
> +What: /sys/bus/iio/devices/iio:deviceX/in_indexY_raw
> +KernelVersion: 4.9
> +Contact: linux-iio@xxxxxxxxxxxxxxx
> +Description:
> + Raw counter device index value from channel Y.
Needs more description. Don't assume people have any idea what an 'index'
value is on a counter.
> diff --git a/drivers/iio/industrialio-core.c b/drivers/iio/industrialio-core.c
> index fc340ed..ed175a2 100644
> --- a/drivers/iio/industrialio-core.c
> +++ b/drivers/iio/industrialio-core.c
> @@ -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[] = {
> @@ -151,6 +153,7 @@ static const char * const iio_chan_info_postfix[] = {
> [IIO_CHAN_INFO_DEBOUNCE_TIME] = "debounce_time",
> [IIO_CHAN_INFO_CALIBEMISSIVITY] = "calibemissivity",
> [IIO_CHAN_INFO_OVERSAMPLING_RATIO] = "oversampling_ratio",
> + [IIO_CHAN_INFO_PRESET] = "preset",
> };
>
> /**
> diff --git a/include/linux/iio/iio.h b/include/linux/iio/iio.h
> index b4a0679..7dc86d1 100644
> --- a/include/linux/iio/iio.h
> +++ b/include/linux/iio/iio.h
> @@ -46,6 +46,7 @@ enum iio_chan_info_enum {
> IIO_CHAN_INFO_DEBOUNCE_TIME,
> IIO_CHAN_INFO_CALIBEMISSIVITY,
> IIO_CHAN_INFO_OVERSAMPLING_RATIO,
> + IIO_CHAN_INFO_PRESET,
> };
>
> enum iio_shared_by {
> diff --git a/include/uapi/linux/iio/types.h b/include/uapi/linux/iio/types.h
> index 22e5e58..e54d14a 100644
> --- a/include/uapi/linux/iio/types.h
> +++ b/include/uapi/linux/iio/types.h
> @@ -40,6 +40,8 @@ enum iio_chan_type {
> IIO_PH,
> IIO_UVINDEX,
> IIO_ELECTRICALCONDUCTIVITY,
> + IIO_COUNT,
> + IIO_INDEX,
> };
>
> enum iio_modifier {
>
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