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authorIrina Tirdea <irina.tirdea@intel.com>2014-11-10 14:45:32 +0200
committerJonathan Cameron <jic23@kernel.org>2014-11-22 11:05:51 +0000
commita88bfe78583026eb9f21d4014ba481b22b66cee3 (patch)
tree5aab15a95c90caa83a08595a3353e779046a2905 /Documentation
parent1843c2f3def16740eb6d129a9790c32dd21aa5ea (diff)
downloadlwn-a88bfe78583026eb9f21d4014ba481b22b66cee3.tar.gz
lwn-a88bfe78583026eb9f21d4014ba481b22b66cee3.zip
iio: core: Introduce STEPS channel, ENABLE mask and INSTANCE event
These changes are needed to support the functionality of a pedometer. A pedometer has two basic functionalities: step counter and step detector. The step counter needs to be enabled and then it will count the steps in its hardware register. Whenever the application needs to check the step count, it will read the step counter register. To support the step counter a new channel type STEPS is added. Since the pedometer needs to be enabled first so that the hardware can count and store the steps, we need a specific ENABLE channel info mask. The step detector will generate an interrupt each time a step is detected. To support this functionality we add a new event type INSTANCE. For more information on the Android requirements for step counter and step detector see: http://source.android.com/devices/sensors/composite_sensors.html#counter and http://source.android.com/devices/sensors/composite_sensors.html#detector. A device that has the pedometer functionality this interface needs to support is Freescale's MMA9553L: http://www.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>
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/ABI/testing/sysfs-bus-iio22
1 files changed, 22 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/sysfs-bus-iio b/Documentation/ABI/testing/sysfs-bus-iio
index 7bf49ad8fd82..c60b0a1af839 100644
--- a/Documentation/ABI/testing/sysfs-bus-iio
+++ b/Documentation/ABI/testing/sysfs-bus-iio
@@ -856,6 +856,13 @@ Description:
number or direction is not specified, applies to all channels of
this type.
+What: /sys/.../events/in_steps_instance_en
+KernelVersion: 3.19
+Contact: linux-iio@vger.kernel.org
+Description:
+ Enables or disables step detection. Each time the user takes a step an
+ event of this type will be generated.
+
What: /sys/bus/iio/devices/iio:deviceX/trigger/current_trigger
KernelVersion: 2.6.35
Contact: linux-iio@vger.kernel.org
@@ -1095,3 +1102,18 @@ Description:
after application of scale and offset. If no offset or scale is
present, output should be considered as processed with the
unit in milliamps.
+
+What: /sys/.../iio:deviceX/in_steps_en
+KernelVersion: 3.19
+Contact: linux-iio@vger.kernel.org
+Description:
+ Activates the step counter. After activation, the number of steps
+ taken by the user will be counted in hardware and exported through
+ in_steps_input.
+
+What: /sys/.../iio:deviceX/in_steps_input
+KernelVersion: 3.19
+Contact: linux-iio@vger.kernel.org
+Description:
+ This attribute is used to read the number of steps taken by the user
+ since the last reboot while activated.