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iio: core: Introduce IIO_ACTIVITY channel

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This channel will be used for exposing information about
activity composite sensors. Activities supported so far:
	* running
	* jogging
	* walking
	* still

THRESHOLD event is used to signal a change in the activity
state.

We associate a confidence interval for each activity expressed
as a percentage from 0 to 100.
  * 0, means the sensor IS NOT reporting that activity.
  * 100, means the sensor IS reporting that activity.

Users of this interface have two possible means to gather
information about the ongoing activities.

1. Event based, via event file descriptor
  * sensor may report an event when ENTERING an activity or LEAVING
    an activity based on a threshold value.
  * drivers will wake up applications waiting data on the event fd

2. Polling, by reading the sysfs associated attribute files:
  * /sys/bus/iio/devices/iio:device0/in_activity_running_input
expressed as percentage confidence value from 0 to 100.

This will offer an interface for Android significant motion
composite sensor defined here:
http://source.android.com/devices/sensors/composite_sensors.html

Activities listed above are supported by Freescale's MMA9553 sensor:
http://freescale.com/files/sensors/doc/ref_manual/MMA9553LSWRM.pdf

Signed-off-by: Irina Tirdea <irina.tirdea@intel.com>
Signed-off-by: Daniel Baluta <daniel.baluta@intel.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Daniel Baluta 2014-11-10 14:45:30 +02:00 committed by Jonathan Cameron
parent 356ae946f9
commit 55aebeb926
3 changed files with 55 additions and 1 deletions
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44
Documentation/ABI/testing/sysfs-bus-iio
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@ -790,6 +790,40 @@ Description:
met before an event is generated. If direction is not
specified then this period applies to both directions.
What: /sys/.../events/in_activity_still_thresh_rising_en
What: /sys/.../events/in_activity_still_thresh_falling_en
What: /sys/.../events/in_activity_walking_thresh_rising_en
What: /sys/.../events/in_activity_walking_thresh_falling_en
What: /sys/.../events/in_activity_jogging_thresh_rising_en
What: /sys/.../events/in_activity_jogging_thresh_falling_en
What: /sys/.../events/in_activity_running_thresh_rising_en
What: /sys/.../events/in_activity_running_thresh_falling_en
KernelVersion: 3.19
Contact: linux-iio@vger.kernel.org
Description:
Enables or disables activitity events. Depending on direction
an event is generated when sensor ENTERS or LEAVES a given state.
What: /sys/.../events/in_activity_still_thresh_rising_value
What: /sys/.../events/in_activity_still_thresh_falling_value
What: /sys/.../events/in_activity_walking_thresh_rising_value
What: /sys/.../events/in_activity_walking_thresh_falling_value
What: /sys/.../events/in_activity_jogging_thresh_rising_value
What: /sys/.../events/in_activity_jogging_thresh_falling_value
What: /sys/.../events/in_activity_running_thresh_rising_value
What: /sys/.../events/in_activity_running_thresh_falling_value
KernelVersion: 3.19
Contact: linux-iio@vger.kernel.org
Description:
Confidence value (in units as percentage) to be used
for deciding when an event should be generated. E.g for
running: If the confidence value reported by the sensor
is greater than in_activity_running_thresh_rising_value
then the sensor ENTERS running state. Conversely, if the
confidence value reported by the sensor is lower than
in_activity_running_thresh_falling_value then the sensor
is LEAVING running state.
What: /sys/.../iio:deviceX/events/in_accel_mag_en
What: /sys/.../iio:deviceX/events/in_accel_mag_rising_en
What: /sys/.../iio:deviceX/events/in_accel_mag_falling_en
@ -956,6 +990,16 @@ Description:
and the relevant _type attributes to establish the data storage
format.
What: /sys/.../iio:deviceX/in_activity_still_input
What: /sys/.../iio:deviceX/in_activity_walking_input
What: /sys/.../iio:deviceX/in_activity_jogging_input
What: /sys/.../iio:deviceX/in_activity_running_input
KernelVersion: 3.19
Contact: linux-iio@vger.kernel.org
Description:
This attribute is used to read the confidence for an activity
expressed in units as percentage.
What: /sys/.../iio:deviceX/in_anglvel_z_quadrature_correction_raw
KernelVersion: 2.6.38
Contact: linux-iio@vger.kernel.org

5
drivers/iio/industrialio-core.c
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@ -70,6 +70,7 @@ static const char * const iio_chan_type_name_spec[] = {
[IIO_CCT] = "cct",
[IIO_PRESSURE] = "pressure",
[IIO_HUMIDITYRELATIVE] = "humidityrelative",
[IIO_ACTIVITY] = "activity",
};
static const char * const iio_modifier_names[] = {
@ -91,6 +92,10 @@ static const char * const iio_modifier_names[] = {
[IIO_MOD_NORTH_TRUE] = "from_north_true",
[IIO_MOD_NORTH_MAGN_TILT_COMP] = "from_north_magnetic_tilt_comp",
[IIO_MOD_NORTH_TRUE_TILT_COMP] = "from_north_true_tilt_comp",
[IIO_MOD_RUNNING] = "running",
[IIO_MOD_JOGGING] = "jogging",
[IIO_MOD_WALKING] = "walking",
[IIO_MOD_STILL] = "still",
};
/* relies on pairs of these shared then separate */

7
include/linux/iio/types.h
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@ -30,6 +30,7 @@ enum iio_chan_type {
IIO_CCT,
IIO_PRESSURE,
IIO_HUMIDITYRELATIVE,
IIO_ACTIVITY,
};
enum iio_modifier {
@ -59,7 +60,11 @@ enum iio_modifier {
IIO_MOD_NORTH_MAGN,
IIO_MOD_NORTH_TRUE,
IIO_MOD_NORTH_MAGN_TILT_COMP,
IIO_MOD_NORTH_TRUE_TILT_COMP
IIO_MOD_NORTH_TRUE_TILT_COMP,
IIO_MOD_RUNNING,
IIO_MOD_JOGGING,
IIO_MOD_WALKING,
IIO_MOD_STILL,
};
enum iio_event_type {