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staging: comedi: pcmad: remove need for boardinfo in pcmad_ai_insn_read()

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The const boardinfo pointer is only used in this function to work out
the value needed to convert the data to its twos complement. Use the
comedi_subdevice 'maxdata' to do this conversion and remove the 'board'
pointer.

Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Cc: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
H Hartley Sweeten 2013-06-05 15:36:45 -07:00 committed by Greg Kroah-Hartman
parent bcc01b4d85
commit a0e82af4c5
1 changed files with 1 additions and 2 deletions
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3
drivers/staging/comedi/drivers/pcmad.c
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@ -88,7 +88,6 @@ static int pcmad_ai_insn_read(struct comedi_device *dev,
struct comedi_subdevice *s,
struct comedi_insn *insn, unsigned int *data)
{
const struct pcmad_board_struct *board = comedi_board(dev);
struct pcmad_priv_struct *devpriv = dev->private;
int chan;
int n;
@ -107,7 +106,7 @@ static int pcmad_ai_insn_read(struct comedi_device *dev,
data[n] |= (inb(dev->iobase + PCMAD_MSB) << 8);
if (devpriv->twos_comp)
data[n] ^= (1 << (board->n_ai_bits - 1));
data[n] ^= ((s->maxdata + 1) >> 1);
}
return n;