On Thu, 26 Nov 2020, Dean Camera wrote: > Currently the hidraw module can only read and write feature HID > reports on demand, via dedicated ioctls. Input reports are read > from the device through the read() interface, while output reports > are written through the write interface(). > > This is insufficient; it is desirable in many situations to be > able to read and write input and output reports through the > control interface to cover additional scenarios: > - Reading an input report by its report ID, to get initial state > - Writing an input report, to set initial input state in the device > - Reading an output report by its report ID, to obtain current state > - Writing an output report by its report ID, out of band > > This patch adds these missing ioctl requests to read and write > the remaining HID report types. Note that not all HID backends will > neccesarily support this (e.g. while the USB link layer supports > setting Input reports, others may not). > > Also included are documentation and example updates. The current > hidraw documentation states that feature reports read from the > device does *not* include the report ID, however this is not the > case and the returned report will have its report ID prepended > by conforming HID devices, as the report data sent from the device > over the control endpoint must be indentical in format to those > sent over the regular transport. This one is now queued in hid.git@for-5.11/core as well. Thanks, -- Jiri Kosina SUSE Labs
