staging: comedi: skel: use comedi_subdevice 'readback'
Use the new comedi_subdevice 'readback' member and the core provided
(*insn_read) for the readback of the analog output subdevice channels.
For aesthetics, rename the (*insn_write) function and tidy it up a bit.
Add a comment about the 'readback' member.
Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Reviewed-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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