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staging: comedi: ni_mio_common: use CR_CHAN more consistently 

Generally, the CR_CHAN macro is/should be used to access the relevant bits
for channel identification in cmd->*_arg when the corresponding
cmd->*_src==TRIG_EXT, including cmd->convert_arg in this case.

This patch does not fix a bug per se, as NISTC_AI_MODE1_CONVERT_SRC() already
masks the value sufficiently, but using CR_CHAN() here makes the code clearer as
it avoids passing some irrelevant bits to NISTC_AI_MODE1_CONVERT_SRC() in the
first place.

Signed-off-by: Spencer E. Olson <olsonse@umich.edu>
Reviewed-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Spencer E. Olson 2016-01-12 11:05:10 -07:00 committed by Greg Kroah-Hartman
parent 1fd24a4702
commit f08a28e65c
1 changed files with 2 additions and 1 deletions
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3
drivers/staging/comedi/drivers/ni_mio_common.c
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@ -2428,7 +2428,8 @@ static int ni_ai_cmd(struct comedi_device *dev, struct comedi_subdevice *s)
ni_stc_writew(dev, mode2, NISTC_AI_MODE2_REG);
break;
case TRIG_EXT:
mode1 |= NISTC_AI_MODE1_CONVERT_SRC(1 + cmd->convert_arg);
mode1 |= NISTC_AI_MODE1_CONVERT_SRC(1 +
CR_CHAN(cmd->convert_arg));
if ((cmd->convert_arg & CR_INVERT) == 0)
mode1 |= NISTC_AI_MODE1_CONVERT_POLARITY;
ni_stc_writew(dev, mode1, NISTC_AI_MODE1_REG);