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    Subject[RFC PATCH v2 2/7] iio: core: Introduce IIO_ACTIVITY channel and TRANSITION event
    Date
    This channel will be used for exposing information about
    activity composite sensors. Activities supported so far:
    * running
    * jogging
    * walking
    * still

    TRANSITION 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 possibile 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>
    ---
    Documentation/ABI/testing/sysfs-bus-iio | 44 +++++++++++++++++++++++++++++++++
    drivers/iio/industrialio-core.c | 5 ++++
    drivers/iio/industrialio-event.c | 1 +
    include/linux/iio/types.h | 8 +++++-
    4 files changed, 57 insertions(+), 1 deletion(-)

    diff --git a/Documentation/ABI/testing/sysfs-bus-iio b/Documentation/ABI/testing/sysfs-bus-iio
    index d760b02..12d0385 100644
    --- a/Documentation/ABI/testing/sysfs-bus-iio
    +++ b/Documentation/ABI/testing/sysfs-bus-iio
    @@ -776,6 +776,40 @@ 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_transition_rising_en
    +What: /sys/.../events/in_activity_still_transition_falling_en
    +What: /sys/.../events/in_activity_walking_transition_rising_en
    +What: /sys/.../events/in_activity_walking_transition_falling_en
    +What: /sys/.../events/in_activity_jogging_transition_rising_en
    +What: /sys/.../events/in_activity_jogging_transition_falling_en
    +What: /sys/.../events/in_activity_running_transition_rising_en
    +What: /sys/.../events/in_activity_running_transition_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_transition_rising_value
    +What: /sys/.../events/in_activity_still_transition_falling_value
    +What: /sys/.../events/in_activity_walking_transition_rising_value
    +What: /sys/.../events/in_activity_walking_transition_falling_value
    +What: /sys/.../events/in_activity_jogging_transition_rising_value
    +What: /sys/.../events/in_activity_jogging_transition_falling_value
    +What: /sys/.../events/in_activity_running_transition_rising_value
    +What: /sys/.../events/in_activity_running_transition_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 then in_activity_running_transition_rising_value
    + then the sensor ENTERS running state. Conversely, if the
    + confidence value reported by the sensor is lower than
    + in_activity_running_transition_rising_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
    @@ -942,6 +976,16 @@ 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
    diff --git a/drivers/iio/industrialio-core.c b/drivers/iio/industrialio-core.c
    index af3e76d..e453ef9 100644
    --- a/drivers/iio/industrialio-core.c
    +++ b/drivers/iio/industrialio-core.c
    @@ -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 */
    diff --git a/drivers/iio/industrialio-event.c b/drivers/iio/industrialio-event.c
    index 0c1e37e..afcf154 100644
    --- a/drivers/iio/industrialio-event.c
    +++ b/drivers/iio/industrialio-event.c
    @@ -197,6 +197,7 @@ static const char * const iio_ev_type_text[] = {
    [IIO_EV_TYPE_ROC] = "roc",
    [IIO_EV_TYPE_THRESH_ADAPTIVE] = "thresh_adaptive",
    [IIO_EV_TYPE_MAG_ADAPTIVE] = "mag_adaptive",
    + [IIO_EV_TYPE_TRANSITION] = "transition",
    };

    static const char * const iio_ev_dir_text[] = {
    diff --git a/include/linux/iio/types.h b/include/linux/iio/types.h
    index 4a2af8a..a08ee6c 100644
    --- a/include/linux/iio/types.h
    +++ b/include/linux/iio/types.h
    @@ -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 {
    @@ -68,6 +73,7 @@ enum iio_event_type {
    IIO_EV_TYPE_ROC,
    IIO_EV_TYPE_THRESH_ADAPTIVE,
    IIO_EV_TYPE_MAG_ADAPTIVE,
    + IIO_EV_TYPE_TRANSITION,
    };

    enum iio_event_info {
    --
    1.9.1


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