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authorPeter Meerwald <pmeerw@pmeerw.net>2013-09-08 16:20:00 +0100
committerJonathan Cameron <jic23@kernel.org>2013-09-14 21:16:44 +0100
commit899d90bdf4d4ef4c3ac0b33cd337c9b3e999ec2d (patch)
treea1c5f999950384f74dffab33780537c2ebc07e6f
parentb909459f1557f62d2af7eee5f080ac0b540923e7 (diff)
iio: Add INT_TIME (integration time) channel info attribute
Integration time is in seconds; it controls the measurement time and influences the gain of a sensor. There are two typical ways that scaling is implemented in a device: 1) input amplifier, 2) reference to the ADC is changed. These both result in the accuracy of the ADC varying (by applying its sampling over a more relevant range). Integration time is a way of dealing with noise inherent in the analog sensor itself. In the case of a light sensor, a mixture of photon noise and device specific noise. Photon noise is dealt with by either improving the efficiency of the sensor, (more photons actually captured) which is not easily varied dynamically, or by integrating the measurement over a longer time period. Note that this can also be thought of as an averaging of a number of individual samples and is infact sometimes implemented this way. Altering integration time implies that the duration of a measurement changes, a fact the device's user may be interested in. Hence it makes sense to distinguish between integration time and simple scale. In some devices both types of control are present and whilst they will have similar effects on the amplitude of the reading, their effect on the noise of the measurements will differ considerably. Used by adjd_s311, tsl4531, tcs3472 The following drivers have similar controls (and could be adapted): * tsl2563 (integration time is controlled via CALIBSCALE among other things) * tsl2583 (has integration_time device_attr, but driver doesn't use channels yet) * tsl2x7x (has integration_time attr) Signed-off-by: Peter Meerwald <pmeerw@pmeerw.net> Cc: Jon Brenner <jon.brenner@ams.com> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
-rw-r--r--Documentation/ABI/testing/sysfs-bus-iio11
-rw-r--r--drivers/iio/industrialio-core.c1
-rw-r--r--include/linux/iio/iio.h1
-rw-r--r--include/linux/iio/sysfs.h15
4 files changed, 28 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/sysfs-bus-iio b/Documentation/ABI/testing/sysfs-bus-iio
index 39c8de0e53d0..ab1047c20495 100644
--- a/Documentation/ABI/testing/sysfs-bus-iio
+++ b/Documentation/ABI/testing/sysfs-bus-iio
@@ -811,3 +811,14 @@ Description:
Writing '1' stores the current device configuration into
on-chip EEPROM. After power-up or chip reset the device will
automatically load the saved configuration.
+
+What: /sys/.../iio:deviceX/in_intensity_red_integration_time
+What: /sys/.../iio:deviceX/in_intensity_green_integration_time
+What: /sys/.../iio:deviceX/in_intensity_blue_integration_time
+What: /sys/.../iio:deviceX/in_intensity_clear_integration_time
+What: /sys/.../iio:deviceX/in_illuminance_integration_time
+KernelVersion: 3.12
+Contact: linux-iio@vger.kernel.org
+Description:
+ This attribute is used to get/set the integration time in
+ seconds.
diff --git a/drivers/iio/industrialio-core.c b/drivers/iio/industrialio-core.c
index 97f0297b120f..2cb4841d5357 100644
--- a/drivers/iio/industrialio-core.c
+++ b/drivers/iio/industrialio-core.c
@@ -101,6 +101,7 @@ static const char * const iio_chan_info_postfix[] = {
[IIO_CHAN_INFO_PHASE] = "phase",
[IIO_CHAN_INFO_HARDWAREGAIN] = "hardwaregain",
[IIO_CHAN_INFO_HYSTERESIS] = "hysteresis",
+ [IIO_CHAN_INFO_INT_TIME] = "integration_time",
};
const struct iio_chan_spec
diff --git a/include/linux/iio/iio.h b/include/linux/iio/iio.h
index 8e7a8132b109..01edd6795550 100644
--- a/include/linux/iio/iio.h
+++ b/include/linux/iio/iio.h
@@ -36,6 +36,7 @@ enum iio_chan_info_enum {
IIO_CHAN_INFO_PHASE,
IIO_CHAN_INFO_HARDWAREGAIN,
IIO_CHAN_INFO_HYSTERESIS,
+ IIO_CHAN_INFO_INT_TIME,
};
enum iio_endian {
diff --git a/include/linux/iio/sysfs.h b/include/linux/iio/sysfs.h
index 2958c960003a..8a1d18640ab9 100644
--- a/include/linux/iio/sysfs.h
+++ b/include/linux/iio/sysfs.h
@@ -100,6 +100,21 @@ struct iio_const_attr {
#define IIO_CONST_ATTR_SAMP_FREQ_AVAIL(_string) \
IIO_CONST_ATTR(sampling_frequency_available, _string)
+/**
+ * IIO_DEV_ATTR_INT_TIME_AVAIL - list available integration times
+ * @_show: output method for the attribute
+ **/
+#define IIO_DEV_ATTR_INT_TIME_AVAIL(_show) \
+ IIO_DEVICE_ATTR(integration_time_available, S_IRUGO, _show, NULL, 0)
+/**
+ * IIO_CONST_ATTR_INT_TIME_AVAIL - list available integration times
+ * @_string: frequency string for the attribute
+ *
+ * Constant version
+ **/
+#define IIO_CONST_ATTR_INT_TIME_AVAIL(_string) \
+ IIO_CONST_ATTR(integration_time_available, _string)
+
#define IIO_DEV_ATTR_TEMP_RAW(_show) \
IIO_DEVICE_ATTR(in_temp_raw, S_IRUGO, _show, NULL, 0)