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iio: core: Introduce DISTANCE channel type 

Some devices export an estimation of the distance the user has covered
since the last reset.

One of this devices is Freescale's MMA9553L
(http://www.freescale.com/files/sensors/doc/ref_manual/MMA9553LSWRM.pdf)
that computes the distance based on the stride length and step rate.

Introduce a new channel type DISTANCE to export these values.

Signed-off-by: Irina Tirdea <irina.tirdea@intel.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
hifive-unleashed-5.1
Irina Tirdea 2015-01-11 21:10:08 +02:00 committed by Jonathan Cameron
parent 72c6664467
commit cc3c9eecae
3 changed files with 12 additions and 0 deletions
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10
Documentation/ABI/testing/sysfs-bus-iio
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@ -283,6 +283,7 @@ What: /sys/bus/iio/devices/iio:deviceX/in_accel_scale
What: /sys/bus/iio/devices/iio:deviceX/in_accel_peak_scale
What: /sys/bus/iio/devices/iio:deviceX/in_anglvel_scale
What: /sys/bus/iio/devices/iio:deviceX/in_energy_scale
What: /sys/bus/iio/devices/iio:deviceX/in_distance_scale
What: /sys/bus/iio/devices/iio:deviceX/in_magn_scale
What: /sys/bus/iio/devices/iio:deviceX/in_magn_x_scale
What: /sys/bus/iio/devices/iio:deviceX/in_magn_y_scale
@ -1059,6 +1060,15 @@ Description:
device (e.g.: human activity sensors report energy burnt by the
user). Units after application of scale are Joules.
What: /sys/.../iio:deviceX/in_distance_input
What: /sys/.../iio:deviceX/in_distance_raw
KernelVersion: 3.20
Contact: linux-iio@vger.kernel.org
Description:
This attribute is used to read the distance covered by the user
since the last reboot while activated. Units after application
of scale are meters.
What: /sys/bus/iio/devices/iio:deviceX/store_eeprom
KernelVersion: 3.4.0
Contact: linux-iio@vger.kernel.org

1
drivers/iio/industrialio-core.c
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@ -73,6 +73,7 @@ static const char * const iio_chan_type_name_spec[] = {
[IIO_ACTIVITY] = "activity",
[IIO_STEPS] = "steps",
[IIO_ENERGY] = "energy",
[IIO_DISTANCE] = "distance",
};
static const char * const iio_modifier_names[] = {

1
include/linux/iio/types.h
View File

@ -33,6 +33,7 @@ enum iio_chan_type {
IIO_ACTIVITY,
IIO_STEPS,
IIO_ENERGY,
IIO_DISTANCE,
};
enum iio_modifier {