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SubjectRe: [PATCH 3/8] iio: core: Introduce SPEED channel type
On 19/12/14 22:57, Irina Tirdea wrote:
> Some devices export the current speed value of the user.
>
> One of this devices is Freescale's MMA9553L
> (http://www.freescale.com/files/sensors/doc/ref_manual/MMA9553LSWRM.pdf)
> that computes the speed of the user based on the number of steps and
> stride length.
>
> Introduce a new channel type SPEED to export these values.
>
A fun question raised by this is whether we are going to end up with
both speed and velocity (depending on whether it is signed or not).
I suppose there isn't much to be done about that though and this looks fine
to me (as does the previous one).
> Signed-off-by: Irina Tirdea <irina.tirdea@intel.com>
> ---
> Documentation/ABI/testing/sysfs-bus-iio | 9 +++++++++
> drivers/iio/industrialio-core.c | 1 +
> include/linux/iio/types.h | 1 +
> 3 files changed, 11 insertions(+)
>
> diff --git a/Documentation/ABI/testing/sysfs-bus-iio b/Documentation/ABI/testing/sysfs-bus-iio
> index a5c1dcc..07acef7 100644
> --- a/Documentation/ABI/testing/sysfs-bus-iio
> +++ b/Documentation/ABI/testing/sysfs-bus-iio
> @@ -295,6 +295,7 @@ What: /sys/bus/iio/devices/iio:deviceX/in_rot_from_north_true_tilt_comp_scale
> What: /sys/bus/iio/devices/iio:deviceX/in_pressureY_scale
> 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_speed_scale
> KernelVersion: 2.6.35
> Contact: linux-iio@vger.kernel.org
> Description:
> @@ -1146,6 +1147,14 @@ Description:
> present, output should be considered as processed with the
> unit in milliamps.
>
> +What: /sys/.../iio:deviceX/in_speed_input
> +What: /sys/.../iio:deviceX/in_speed_raw
> +KernelVersion: 3.19
> +Contact: linux-iio@vger.kernel.org
> +Description:
> + This attribute is used to read the current speed value of the user.
> + Units after application of scale are m/s.
> +
> What: /sys/.../iio:deviceX/in_steps_en
> KernelVersion: 3.19
> Contact: linux-iio@vger.kernel.org
> diff --git a/drivers/iio/industrialio-core.c b/drivers/iio/industrialio-core.c
> index 4a10d31..5e50aca 100644
> --- a/drivers/iio/industrialio-core.c
> +++ b/drivers/iio/industrialio-core.c
> @@ -74,6 +74,7 @@ static const char * const iio_chan_type_name_spec[] = {
> [IIO_STEPS] = "steps",
> [IIO_CALORIES] = "calories",
> [IIO_DISTANCE] = "distance",
> + [IIO_SPEED] = "speed",
> };
>
> static const char * const iio_modifier_names[] = {
> diff --git a/include/linux/iio/types.h b/include/linux/iio/types.h
> index b98f751..c848f45 100644
> --- a/include/linux/iio/types.h
> +++ b/include/linux/iio/types.h
> @@ -34,6 +34,7 @@ enum iio_chan_type {
> IIO_STEPS,
> IIO_CALORIES,
> IIO_DISTANCE,
> + IIO_SPEED,
> };
>
> enum iio_modifier {
>



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