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Staging: comedi: ni_65xx.c: fix output inversion problem.

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When reading DO subdevice with inverted outputs invert the values read
back from the ports to match the inversion of values written.

Signed-off-by: Frank Mori Hess <fmhess@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Ian Abbott 2009-09-21 16:05:01 -04:00 committed by Greg Kroah-Hartman
parent 2b49d7c40e
commit 078a10df24
1 changed files with 6 additions and 0 deletions
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6
drivers/staging/comedi/drivers/ni_65xx.c
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@ -457,6 +457,12 @@ static int ni_65xx_dio_insn_bits(struct comedi_device *dev,
port_read_bits =
readb(private(dev)->mite->daq_io_addr + Port_Data(port));
/* printk("read 0x%x from port %i\n", port_read_bits, port); */
if (s->type == COMEDI_SUBD_DO && board(dev)->invert_outputs) {
/* Outputs inverted, so invert value read back from
* DO subdevice. (Does not apply to boards with DIO
* subdevice.) */
port_read_bits ^= 0xFF;
}
if (bitshift > 0) {
port_read_bits <<= bitshift;
} else {