Commit 90f39b9f authored Apr 08, 2016 by H Hartley Sweeten Committed by Greg Kroah-Hartman Apr 28, 2016

staging: comedi: das1800: use comedi_offset_munge() for analog output



The analog outputs expect 2's complement data. For aesthetics, use
the helper function to handle the munging instead of depending on
the boardinfo 'resolution'.

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>

parent 7a925496

drivers/staging/comedi/drivers/das1800.c

+1 −2

Original line number	Diff line number	Diff line
		@@ -1132,8 +1132,7 @@ static int das1800_ao_insn_write(struct comedi_device *dev,
		unsigned short output;
		unsigned long irq_flags;

		/* card expects two's complement data */
		output = data[0] - (1 << (board->resolution - 1));
		output = comedi_offset_munge(s, data[0]);
		/* if the write is to the 'update' channel, we need to remember its value */
		if (chan == update_chan)
		devpriv->ao_update_bits = output;