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staging: comedi: ni_660x: add a comment about the initial DIO state 

The (*auto_attach) initializes all the DIO channels to a default state.
Add a comment for clarity.

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>
This commit is contained in:
H Hartley Sweeten 2016-03-22 11:10:34 -07:00 committed by Greg Kroah-Hartman
parent aa94f28888
commit f0c9305ede
1 changed files with 5 additions and 0 deletions
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5
drivers/staging/comedi/drivers/ni_660x.c
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@ -1073,6 +1073,11 @@ static int ni_660x_auto_attach(struct comedi_device *dev,
for (i = 0; i < n_counters; ++i)
ni_tio_init_counter(&devpriv->counter_dev->counters[i]);
/*
* Default the DIO channels as:
* chan 0-7: DIO inputs
* chan 8-39: counter signal inputs
*/
for (i = 0; i < NUM_PFI_CHANNELS; ++i) {
if (i < 8)
ni_660x_set_pfi_routing(dev, i, NI_660X_PFI_OUTPUT_DIO);