diff options
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/hid/uhid.txt | 2 | ||||
| -rw-r--r-- | Documentation/input/event-codes.rst | 21 |
2 files changed, 21 insertions, 2 deletions
diff --git a/Documentation/hid/uhid.txt b/Documentation/hid/uhid.txt index c8656dd029a9..958fff945304 100644 --- a/Documentation/hid/uhid.txt +++ b/Documentation/hid/uhid.txt @@ -160,7 +160,7 @@ them but you should handle them according to your needs. UHID_OUTPUT: This is sent if the HID device driver wants to send raw data to the I/O device on the interrupt channel. You should read the payload and forward it to - the device. The payload is of type "struct uhid_data_req". + the device. The payload is of type "struct uhid_output_req". This may be received even though you haven't received UHID_OPEN, yet. UHID_GET_REPORT: diff --git a/Documentation/input/event-codes.rst b/Documentation/input/event-codes.rst index a8c0873beb95..b24b5343f5eb 100644 --- a/Documentation/input/event-codes.rst +++ b/Documentation/input/event-codes.rst @@ -190,7 +190,26 @@ A few EV_REL codes have special meanings: * REL_WHEEL, REL_HWHEEL: - These codes are used for vertical and horizontal scroll wheels, - respectively. + respectively. The value is the number of detents moved on the wheel, the + physical size of which varies by device. For high-resolution wheels + this may be an approximation based on the high-resolution scroll events, + see REL_WHEEL_HI_RES. These event codes are legacy codes and + REL_WHEEL_HI_RES and REL_HWHEEL_HI_RES should be preferred where + available. + +* REL_WHEEL_HI_RES, REL_HWHEEL_HI_RES: + + - High-resolution scroll wheel data. The accumulated value 120 represents + movement by one detent. For devices that do not provide high-resolution + scrolling, the value is always a multiple of 120. For devices with + high-resolution scrolling, the value may be a fraction of 120. + + If a vertical scroll wheel supports high-resolution scrolling, this code + will be emitted in addition to REL_WHEEL or REL_HWHEEL. The REL_WHEEL + and REL_HWHEEL may be an approximation based on the high-resolution + scroll events. There is no guarantee that the high-resolution data + is a multiple of 120 at the time of an emulated REL_WHEEL or REL_HWHEEL + event. EV_ABS ------ |