iio: core: Introduce IIO_CHAN_INFO_CALIBWEIGHT

Some devices need the weight of the user to compute other
parameters. One of this devices is Freescale's MMA9553L
(http://www.freescale.com/files/sensors/doc/ref_manual/MMA9553LSWRM.pdf)
that needs the weight of the user to compute the number of calories burnt.

Signed-off-by: Irina Tirdea <irina.tirdea@intel.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

3 files changed, 9 insertions, 0 deletions

diff --git a/Documentation/ABI/testing/sysfs-bus-iio b/Documentation/ABI/testing/sysfs-bus-iio
index 80b5efb1cdbf..71dc8db4388b 100644
--- a/Documentation/ABI/testing/sysfs-bus-iio
+++ b/Documentation/ABI/testing/sysfs-bus-iio
@@ -351,6 +351,13 @@ Description:
                 to compute the stride length, distance, speed and activity
                 type.
 
+What:           /sys/bus/iio/devices/iio:deviceX/in_energy_calibweight
+KernelVersion:  3.20
+Contact:        linux-iio@vger.kernel.org
+Description:
+                Weight of the user (in kg). It is needed by some pedometers
+                to compute the calories burnt by the user.
+
 What:           /sys/bus/iio/devices/iio:deviceX/in_accel_scale_available
 What:           /sys/.../iio:deviceX/in_voltageX_scale_available
 What:           /sys/.../iio:deviceX/in_voltage-voltage_scale_available
diff --git a/drivers/iio/industrialio-core.c b/drivers/iio/industrialio-core.c
index 18a8ab911aab..4ee6fdfa92fe 100644
--- a/drivers/iio/industrialio-core.c
+++ b/drivers/iio/industrialio-core.c
@@ -125,6 +125,7 @@ static const char * const iio_chan_info_postfix[] = {
         [IIO_CHAN_INFO_INT_TIME] = "integration_time",
         [IIO_CHAN_INFO_ENABLE] = "en",
         [IIO_CHAN_INFO_CALIBHEIGHT] = "calibheight",
+        [IIO_CHAN_INFO_CALIBWEIGHT] = "calibweight",
 };
 
 /**
diff --git a/include/linux/iio/iio.h b/include/linux/iio/iio.h
index 590202024857..51f16437dacc 100644
--- a/include/linux/iio/iio.h
+++ b/include/linux/iio/iio.h
@@ -40,6 +40,7 @@ enum iio_chan_info_enum {
         IIO_CHAN_INFO_INT_TIME,
         IIO_CHAN_INFO_ENABLE,
         IIO_CHAN_INFO_CALIBHEIGHT,
+        IIO_CHAN_INFO_CALIBWEIGHT,
 };
 
 enum iio_shared_by {