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| author | Jiri Kosina <jkosina@suse.cz> | 2017-11-15 11:04:13 +0100 |
|---|---|---|
| committer | Jiri Kosina <jkosina@suse.cz> | 2017-11-15 11:04:13 +0100 |
| commit | 5cc619db5c34146ee821acd08382b9d78579b52e (patch) | |
| tree | ee28e3cefdb35d56e33887f05db0a50589aa5883 /Documentation/ABI/testing/sysfs-bus-iio-lptimer-stm32 | |
| parent | Merge branch 'for-4.14/upstream-fixes' into for-linus (diff) | |
| parent | HID: alps: add new U1 device ID (diff) | |
| download | linux-5cc619db5c34146ee821acd08382b9d78579b52e.tar.xz linux-5cc619db5c34146ee821acd08382b9d78579b52e.zip | |
Merge branch 'for-4.15/alps' into for-linus
- New ALPS touchpad (T4, found currently on HP EliteBook 1000, Zbook Stduio
and HP Elite book x360) support from Masaki Ota
Diffstat (limited to 'Documentation/ABI/testing/sysfs-bus-iio-lptimer-stm32')
| -rw-r--r-- | Documentation/ABI/testing/sysfs-bus-iio-lptimer-stm32 | 57 |
1 files changed, 57 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/sysfs-bus-iio-lptimer-stm32 b/Documentation/ABI/testing/sysfs-bus-iio-lptimer-stm32 new file mode 100644 index 000000000000..ad2cc63e4bf8 --- /dev/null +++ b/Documentation/ABI/testing/sysfs-bus-iio-lptimer-stm32 @@ -0,0 +1,57 @@ +What: /sys/bus/iio/devices/iio:deviceX/in_count0_preset +KernelVersion: 4.13 +Contact: fabrice.gasnier@st.com +Description: + Reading returns the current preset value. Writing sets the + preset value. Encoder counts continuously from 0 to preset + value, depending on direction (up/down). + +What: /sys/bus/iio/devices/iio:deviceX/in_count_quadrature_mode_available +KernelVersion: 4.13 +Contact: fabrice.gasnier@st.com +Description: + Reading returns the list possible quadrature modes. + +What: /sys/bus/iio/devices/iio:deviceX/in_count0_quadrature_mode +KernelVersion: 4.13 +Contact: fabrice.gasnier@st.com +Description: + Configure the device counter quadrature modes: + - non-quadrature: + Encoder IN1 input servers as the count input (up + direction). + - quadrature: + Encoder IN1 and IN2 inputs are mixed to get direction + and count. + +What: /sys/bus/iio/devices/iio:deviceX/in_count_polarity_available +KernelVersion: 4.13 +Contact: fabrice.gasnier@st.com +Description: + Reading returns the list possible active edges. + +What: /sys/bus/iio/devices/iio:deviceX/in_count0_polarity +KernelVersion: 4.13 +Contact: fabrice.gasnier@st.com +Description: + Configure the device encoder/counter active edge: + - rising-edge + - falling-edge + - both-edges + + In non-quadrature mode, device counts up on active edge. + In quadrature mode, encoder counting scenarios are as follows: + ---------------------------------------------------------------- + | Active | Level on | IN1 signal | IN2 signal | + | edge | opposite |------------------------------------------ + | | signal | Rising | Falling | Rising | Falling | + ---------------------------------------------------------------- + | Rising | High -> | Down | - | Up | - | + | edge | Low -> | Up | - | Down | - | + ---------------------------------------------------------------- + | Falling | High -> | - | Up | - | Down | + | edge | Low -> | - | Down | - | Up | + ---------------------------------------------------------------- + | Both | High -> | Down | Up | Up | Down | + | edges | Low -> | Up | Down | Down | Up | + ---------------------------------------------------------------- |