From: Ian Abbott <abbotti@mev.co.uk>
Date: Mon, 21 Sep 2009 20:05:01 +0000 (-0400)
Subject: Staging: comedi: ni_65xx.c: fix output inversion problem.
X-Git-Tag: 2.1b_release~10646^2~3
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=078a10df24ac87d18c2d52fb501ff652f481fb5b;p=platform%2Fkernel%2Fkernel-mfld-blackbay.git

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

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>
---

diff --git a/drivers/staging/comedi/drivers/ni_65xx.c b/drivers/staging/comedi/drivers/ni_65xx.c
index b664ce0..bbf75eb 100644
--- a/drivers/staging/comedi/drivers/ni_65xx.c
+++ b/drivers/staging/comedi/drivers/ni_65xx.c
@@ -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 {