diff options
Diffstat (limited to 'Documentation/ABI/testing')
| -rw-r--r-- | Documentation/ABI/testing/sysfs-bus-iio | 45 | ||||
| -rw-r--r-- | Documentation/ABI/testing/sysfs-bus-iio-adc-mcp3564 | 53 |
2 files changed, 98 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/sysfs-bus-iio b/Documentation/ABI/testing/sysfs-bus-iio index 0c9389ad3709..8e13642bbe23 100644 --- a/Documentation/ABI/testing/sysfs-bus-iio +++ b/Documentation/ABI/testing/sysfs-bus-iio @@ -279,6 +279,35 @@ Description: but should match other such assignments on device). Units after application of scale and offset are m/s^2. +What: /sys/bus/iio/devices/iio:deviceX/in_deltaangl_x_raw +What: /sys/bus/iio/devices/iio:deviceX/in_deltaangl_y_raw +What: /sys/bus/iio/devices/iio:deviceX/in_deltaangl_z_raw +KernelVersion: 6.5 +Contact: linux-iio@vger.kernel.org +Description: + Angular displacement between two consecutive samples on x, y or + z (may be arbitrarily assigned but should match other such + assignments on device). + In order to compute the total angular displacement during a + desired period of time, the application should sum-up the delta + angle samples acquired during that time. + Units after application of scale and offset are radians. + +What: /sys/bus/iio/devices/iio:deviceX/in_deltavelocity_x_raw +What: /sys/bus/iio/devices/iio:deviceX/in_deltavelocity_y_raw +What: /sys/bus/iio/devices/iio:deviceX/in_deltavelocity_z_raw +KernelVersion: 6.5 +Contact: linux-iio@vger.kernel.org +Description: + The linear velocity change between two consecutive samples on x, + y or z (may be arbitrarily assigned but should match other such + assignments on device). + In order to compute the total linear velocity change during a + desired period of time, the application should sum-up the delta + velocity samples acquired during that time. + Units after application of scale and offset are meters per + second. + What: /sys/bus/iio/devices/iio:deviceX/in_angl_raw What: /sys/bus/iio/devices/iio:deviceX/in_anglY_raw KernelVersion: 4.17 @@ -461,6 +490,8 @@ What: /sys/bus/iio/devices/iio:deviceX/in_humidityrelative_scale What: /sys/bus/iio/devices/iio:deviceX/in_velocity_sqrt(x^2+y^2+z^2)_scale What: /sys/bus/iio/devices/iio:deviceX/in_illuminance_scale What: /sys/bus/iio/devices/iio:deviceX/in_countY_scale +What: /sys/bus/iio/devices/iio:deviceX/in_deltaangl_scale +What: /sys/bus/iio/devices/iio:deviceX/in_deltavelocity_scale What: /sys/bus/iio/devices/iio:deviceX/in_angl_scale What: /sys/bus/iio/devices/iio:deviceX/in_intensity_x_scale What: /sys/bus/iio/devices/iio:deviceX/in_intensity_y_scale @@ -1332,6 +1363,12 @@ Description: What: /sys/.../iio:deviceX/bufferY/in_accel_x_en What: /sys/.../iio:deviceX/bufferY/in_accel_y_en What: /sys/.../iio:deviceX/bufferY/in_accel_z_en +What: /sys/.../iio:deviceX/bufferY/in_deltaangl_x_en +What: /sys/.../iio:deviceX/bufferY/in_deltaangl_y_en +What: /sys/.../iio:deviceX/bufferY/in_deltaangl_z_en +What: /sys/.../iio:deviceX/bufferY/in_deltavelocity_x_en +What: /sys/.../iio:deviceX/bufferY/in_deltavelocity_y_en +What: /sys/.../iio:deviceX/bufferY/in_deltavelocity_z_en What: /sys/.../iio:deviceX/bufferY/in_anglvel_x_en What: /sys/.../iio:deviceX/bufferY/in_anglvel_y_en What: /sys/.../iio:deviceX/bufferY/in_anglvel_z_en @@ -1362,6 +1399,8 @@ Description: Scan element control for triggered data capture. What: /sys/.../iio:deviceX/bufferY/in_accel_type +What: /sys/.../iio:deviceX/bufferY/in_deltaangl_type +What: /sys/.../iio:deviceX/bufferY/in_deltavelocity_type What: /sys/.../iio:deviceX/bufferY/in_anglvel_type What: /sys/.../iio:deviceX/bufferY/in_magn_type What: /sys/.../iio:deviceX/bufferY/in_incli_type @@ -1416,6 +1455,12 @@ What: /sys/.../iio:deviceX/bufferY/in_voltage_q_index What: /sys/.../iio:deviceX/bufferY/in_accel_x_index What: /sys/.../iio:deviceX/bufferY/in_accel_y_index What: /sys/.../iio:deviceX/bufferY/in_accel_z_index +What: /sys/.../iio:deviceX/bufferY/in_deltaangl_x_index +What: /sys/.../iio:deviceX/bufferY/in_deltaangl_y_index +What: /sys/.../iio:deviceX/bufferY/in_deltaangl_z_index +What: /sys/.../iio:deviceX/bufferY/in_deltavelocity_x_index +What: /sys/.../iio:deviceX/bufferY/in_deltavelocity_y_index +What: /sys/.../iio:deviceX/bufferY/in_deltavelocity_z_index What: /sys/.../iio:deviceX/bufferY/in_anglvel_x_index What: /sys/.../iio:deviceX/bufferY/in_anglvel_y_index What: /sys/.../iio:deviceX/bufferY/in_anglvel_z_index diff --git a/Documentation/ABI/testing/sysfs-bus-iio-adc-mcp3564 b/Documentation/ABI/testing/sysfs-bus-iio-adc-mcp3564 new file mode 100644 index 000000000000..b168aa44b233 --- /dev/null +++ b/Documentation/ABI/testing/sysfs-bus-iio-adc-mcp3564 @@ -0,0 +1,53 @@ +What: /sys/bus/iio/devices/iio:deviceX/boost_current_gain +KernelVersion: 6.4 +Contact: linux-iio@vger.kernel.org +Description: + This attribute is used to set the gain of the biasing current + circuit of the Delta-Sigma modulator. The different BOOST + settings are applied to the entire modulator circuit, including + the voltage reference buffers. + +What: /sys/bus/iio/devices/iio:deviceX/boost_current_gain_available +KernelVersion: 6.4 +Contact: linux-iio@vger.kernel.org +Description: + Reading returns a list with the possible gain values for + the current biasing circuit of the Delta-Sigma modulator. + +What: /sys/bus/iio/devices/iio:deviceX/auto_zeroing_mux_enable +KernelVersion: 6.4 +Contact: linux-iio@vger.kernel.org +Description: + This attribute is used to enable the analog input multiplexer + auto-zeroing algorithm (the input multiplexer and the ADC + include an offset cancellation algorithm that cancels the offset + contribution of the ADC). When the offset cancellation algorithm + is enabled, ADC takes two conversions, one with the differential + input as VIN+/VIN-, one with VIN+/VIN- inverted. In this case the + conversion time is multiplied by two compared to the default + case where the algorithm is disabled. This technique allows the + cancellation of the ADC offset error and the achievement of + ultra-low offset without any digital calibration. The resulting + offset is the residue of the difference between the two + conversions, which is on the order of magnitude of the noise + floor. This offset is effectively canceled at every conversion, + so the residual offset error temperature drift is extremely low. + Write '1' to enable it, write '0' to disable it. + +What: /sys/bus/iio/devices/iio:deviceX/auto_zeroing_ref_enable +KernelVersion: 6.4 +Contact: linux-iio@vger.kernel.org +Description: + This attribute is used to enable the chopping algorithm for the + internal voltage reference buffer. This setting has no effect + when external voltage reference is selected. + Internal voltage reference buffer injects a certain quantity of + 1/f noise into the system that can be modulated with the + incoming input signals and can limit the SNR performance at + higher Oversampling Ratio values (over 256). To overcome this + limitation, the buffer includes an auto-zeroing algorithm that + greatly reduces (cancels out) the 1/f noise and cancels the + offset value of the reference buffer. As a result, the SNR of + the system is not affected by this 1/f noise component of the + reference buffer, even at maximum oversampling ratio values. + Write '1' to enable it, write '0' to disable it. |