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iio: core: Introduce CHANGE event type

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A step detector will generate an interrupt each time N step are detected.
A device that has such pedometer functionality is Freescale's MMA9553L:
http://www.freescale.com/files/sensors/doc/ref_manual/MMA9553LSWRM.pdf.

Introduce IIO_EV_TYPE_CHANGE event type for events that are generated
when the channel passes a threshold on the absolute change in value.

Signed-off-by: Irina Tirdea <irina.tirdea@intel.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Irina Tirdea 2015-01-11 21:10:11 +02:00 committed by Jonathan Cameron
parent d37f6836fa
commit 27be84236d
4 changed files with 20 additions and 4 deletions
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20
Documentation/ABI/testing/sysfs-bus-iio
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@ -891,12 +891,24 @@ Description:
number or direction is not specified, applies to all channels of number or direction is not specified, applies to all channels of
this type. this type.
What: /sys/.../events/in_steps_instance_en What: /sys/.../events/in_steps_change_en
KernelVersion: 3.19 KernelVersion: 3.20
Contact: linux-iio@vger.kernel.org Contact: linux-iio@vger.kernel.org
Description: Description:
Enables or disables step detection. Each time the user takes a step an Event generated when channel passes a threshold on the absolute
event of this type will be generated. change in value. E.g. for steps: a step change event is
generated each time the user takes N steps, where N is set using
in_steps_change_value.
What: /sys/.../events/in_steps_change_value
KernelVersion: 3.20
Contact: linux-iio@vger.kernel.org
Description:
Specifies the value of change threshold that the
device is comparing against for the events enabled by
<type>[Y][_name]_roc[_rising|falling|]_en. E.g. for steps:
if set to 3, a step change event will be generated every 3
steps.
What: /sys/bus/iio/devices/iio:deviceX/trigger/current_trigger What: /sys/bus/iio/devices/iio:deviceX/trigger/current_trigger
KernelVersion: 2.6.35 KernelVersion: 2.6.35

1
drivers/iio/industrialio-event.c
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@ -198,6 +198,7 @@ static const char * const iio_ev_type_text[] = {
[IIO_EV_TYPE_THRESH_ADAPTIVE] = "thresh_adaptive", [IIO_EV_TYPE_THRESH_ADAPTIVE] = "thresh_adaptive",
[IIO_EV_TYPE_MAG_ADAPTIVE] = "mag_adaptive", [IIO_EV_TYPE_MAG_ADAPTIVE] = "mag_adaptive",
[IIO_EV_TYPE_INSTANCE] = "instance", [IIO_EV_TYPE_INSTANCE] = "instance",
[IIO_EV_TYPE_CHANGE] = "change",
}; };
static const char * const iio_ev_dir_text[] = { static const char * const iio_ev_dir_text[] = {

2
drivers/staging/iio/Documentation/iio_event_monitor.c
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@ -60,6 +60,7 @@ static const char * const iio_ev_type_text[] = {
[IIO_EV_TYPE_THRESH_ADAPTIVE] = "thresh_adaptive", [IIO_EV_TYPE_THRESH_ADAPTIVE] = "thresh_adaptive",
[IIO_EV_TYPE_MAG_ADAPTIVE] = "mag_adaptive", [IIO_EV_TYPE_MAG_ADAPTIVE] = "mag_adaptive",
[IIO_EV_TYPE_INSTANCE] = "instance", [IIO_EV_TYPE_INSTANCE] = "instance",
[IIO_EV_TYPE_CHANGE] = "change",
}; };
static const char * const iio_ev_dir_text[] = { static const char * const iio_ev_dir_text[] = {
@ -179,6 +180,7 @@ static bool event_is_known(struct iio_event_data *event)
case IIO_EV_TYPE_THRESH_ADAPTIVE: case IIO_EV_TYPE_THRESH_ADAPTIVE:
case IIO_EV_TYPE_MAG_ADAPTIVE: case IIO_EV_TYPE_MAG_ADAPTIVE:
case IIO_EV_TYPE_INSTANCE: case IIO_EV_TYPE_INSTANCE:
case IIO_EV_TYPE_CHANGE:
break; break;
default: default:
return false; return false;

1
include/linux/iio/types.h
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@ -79,6 +79,7 @@ enum iio_event_type {
IIO_EV_TYPE_THRESH_ADAPTIVE, IIO_EV_TYPE_THRESH_ADAPTIVE,
IIO_EV_TYPE_MAG_ADAPTIVE, IIO_EV_TYPE_MAG_ADAPTIVE,
IIO_EV_TYPE_INSTANCE, IIO_EV_TYPE_INSTANCE,
IIO_EV_TYPE_CHANGE,
}; };
enum iio_event_info { enum iio_event_info {