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.tir...@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-...@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-...@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-...@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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