tree 4d2de9b91a2ab4ade95e5ea7f22dcfa7c833d66b
parent 3b2468fe9854941a175d57642a05aad6f52289c7
author Ian Abbott <abbotti@mev.co.uk> 1445965162 +0000
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1446076716 +0900

staging: comedi: comedi_test: allow read-back of AO channels

COMEDI drivers often allow the last value written to a channel on an
analog output subdevice to be read back via the "insn_read" handler.
The "comedi_test" driver does not currently support that.  It is a bit
special because it loops back the last values written to the channel on
the analog output subdevice to be read back via corresponding channels
on the analog input subdevice.  The "insn_read" handler for the analog
input subdevice is `waveform_ai_insn_read()`.  Set that as the
"insn_read" handler for the analog output subdevice as well.

Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Reviewed-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>