diff options
| author | Andrew F. Davis <afd@ti.com> | 2016-05-01 22:36:58 +0200 |
|---|---|---|
| committer | Jonathan Cameron <jic23@kernel.org> | 2016-05-04 12:08:14 +0200 |
| commit | 24b9dea764bdf0de8434fb4567e7f62038ba869e (patch) | |
| tree | 0a47eb7be88c9beed70b0c5519f80c5614e6505d /Documentation/ABI | |
| parent | iio: health/afe4404: Remove LED3 input channel (diff) | |
| download | linux-24b9dea764bdf0de8434fb4567e7f62038ba869e.tar.xz linux-24b9dea764bdf0de8434fb4567e7f62038ba869e.zip | |
iio: health/afe440x: Remove channel names
These AFEs have 4 ADC mesuring stages (called LED2, ALED2, LED1, and
ALED1 in the datasheet), we map these as channels, these stages can serve
different purposes depending on the application. For instance the AFE4404
has an additional LED (LED3), this LED can be timed to be active during
stage 2 (or anystage, but the datasheet describes this case and the name
of the stage reflects this use). This ability is used further in upcoming
parts that tie the front-end gain and the LED timings together. For these
reasons we remove explicit naming the channels.
Without channel names it is best that the index numbers are in order to
match the stage number, reorder the channel numbers.
Signed-off-by: Andrew F. Davis <afd@ti.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Diffstat (limited to 'Documentation/ABI')
| -rw-r--r-- | Documentation/ABI/testing/sysfs-bus-iio-health-afe440x | 39 |
1 files changed, 18 insertions, 21 deletions
diff --git a/Documentation/ABI/testing/sysfs-bus-iio-health-afe440x b/Documentation/ABI/testing/sysfs-bus-iio-health-afe440x index b19053a86054..a06707320d84 100644 --- a/Documentation/ABI/testing/sysfs-bus-iio-health-afe440x +++ b/Documentation/ABI/testing/sysfs-bus-iio-health-afe440x @@ -8,38 +8,35 @@ Description: Transimpedance Amplifier. Y is 1 for Rf1 and Cf1, Y is 2 for Rf2 and Cf2 values. -What: /sys/bus/iio/devices/iio:deviceX/in_intensity_ledY_raw - /sys/bus/iio/devices/iio:deviceX/in_intensity_ledY_ambient_raw -Date: December 2015 +What: /sys/bus/iio/devices/iio:deviceX/in_intensityY_raw +Date: May 2016 KernelVersion: Contact: Andrew F. Davis <afd@ti.com> Description: Get measured values from the ADC for these stages. Y is the - specific LED number. The values are expressed in 24-bit twos - complement. - -What: /sys/bus/iio/devices/iio:deviceX/in_intensity_ledY-ledY_ambient_raw -Date: December 2015 -KernelVersion: -Contact: Andrew F. Davis <afd@ti.com> -Description: - Get differential values from the ADC for these stages. Y is the - specific LED number. The values are expressed in 24-bit twos - complement for the specified LEDs. + specific stage number corresponding to datasheet stage names + as follows: + 1 -> LED2 + 2 -> ALED2/LED3 + 3 -> LED1 + 4 -> ALED1/LED4 + Note that channels 5 and 6 represent LED2-ALED2 and LED1-ALED1 + respectively which simply helper channels containing the + calculated difference in the value of stage 1 - 2 and 3 - 4. + The values are expressed in 24-bit twos complement. -What: /sys/bus/iio/devices/iio:deviceX/out_current_ledY_offset - /sys/bus/iio/devices/iio:deviceX/out_current_ledY_ambient_offset -Date: December 2015 +What: /sys/bus/iio/devices/iio:deviceX/in_intensityY_offset +Date: May 2016 KernelVersion: Contact: Andrew F. Davis <afd@ti.com> Description: Get and set the offset cancellation DAC setting for these stages. The values are expressed in 5-bit sign-magnitude. -What: /sys/bus/iio/devices/iio:deviceX/out_current_ledY_raw -Date: December 2015 +What: /sys/bus/iio/devices/iio:deviceX/out_currentY_raw +Date: May 2016 KernelVersion: Contact: Andrew F. Davis <afd@ti.com> Description: - Get and set the LED current for the specified LED. Y is the - specific LED number. + Get and set the LED current for the specified LED active during + this stage. Y is the specific stage number. |