diff options
| author | H Hartley Sweeten <hsweeten@visionengravers.com> | 2016-03-22 11:10:31 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-03-28 07:30:36 -0700 |
| commit | 7e9061869435dbeefff970b032d2b8141ce9e301 (patch) | |
| tree | d6f94f3dceb9b47c6ad884b45c626496ff683640 /drivers/staging/comedi/drivers/ni_660x.c | |
| parent | cded944fa90cf8105eedb5766ecaee82a2f86b3a (diff) | |
staging: comedi: ni_660x: tidy up Digital I/O subdevice init
Add some whitespace to the Digital I/O subdevice init and add a
comment about the channels. This driver is a bit goofy, only 32 of
the 40 channels can actually be used for Digital I/Os and 32 of
them can be routed to the counters for alternate use.
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>
Diffstat (limited to 'drivers/staging/comedi/drivers/ni_660x.c')
| -rw-r--r-- | drivers/staging/comedi/drivers/ni_660x.c | 68 |
1 files changed, 60 insertions, 8 deletions
diff --git a/drivers/staging/comedi/drivers/ni_660x.c b/drivers/staging/comedi/drivers/ni_660x.c index 4f7f5ca01e97..f24009c98e0a 100644 --- a/drivers/staging/comedi/drivers/ni_660x.c +++ b/drivers/staging/comedi/drivers/ni_660x.c @@ -964,15 +964,67 @@ static int ni_660x_auto_attach(struct comedi_device *dev, /* Old GENERAL-PURPOSE COUNTER/TIME (GPCT) subdevice, no longer used */ s->type = COMEDI_SUBD_UNUSED; + /* + * Digital I/O subdevice + * + * There are 40 channels but only the first 32 can be digital I/Os. + * The last 8 are dedicated to counters 0 and 1. + * + * Counter 0-3 signals are from the first TIO chip. + * Counter 4-7 signals are from the second TIO chip. + * + * Comedi External + * PFI Chan DIO Chan Counter Signal + * ------- -------- -------------- + * 0 0 + * 1 1 + * 2 2 + * 3 3 + * 4 4 + * 5 5 + * 6 6 + * 7 7 + * 8 8 CTR 7 OUT + * 9 9 CTR 7 AUX + * 10 10 CTR 7 GATE + * 11 11 CTR 7 SOURCE + * 12 12 CTR 6 OUT + * 13 13 CTR 6 AUX + * 14 14 CTR 6 GATE + * 15 15 CTR 6 SOURCE + * 16 16 CTR 5 OUT + * 17 17 CTR 5 AUX + * 18 18 CTR 5 GATE + * 19 19 CTR 5 SOURCE + * 20 20 CTR 4 OUT + * 21 21 CTR 4 AUX + * 22 22 CTR 4 GATE + * 23 23 CTR 4 SOURCE + * 24 24 CTR 3 OUT + * 25 25 CTR 3 AUX + * 26 26 CTR 3 GATE + * 27 27 CTR 3 SOURCE + * 28 28 CTR 2 OUT + * 29 29 CTR 2 AUX + * 30 30 CTR 2 GATE + * 31 31 CTR 2 SOURCE + * 32 CTR 1 OUT + * 33 CTR 1 AUX + * 34 CTR 1 GATE + * 35 CTR 1 SOURCE + * 36 CTR 0 OUT + * 37 CTR 0 AUX + * 38 CTR 0 GATE + * 39 CTR 0 SOURCE + */ s = &dev->subdevices[subdev++]; - /* DIGITAL I/O SUBDEVICE */ - s->type = COMEDI_SUBD_DIO; - s->subdev_flags = SDF_READABLE | SDF_WRITABLE; - s->n_chan = NUM_PFI_CHANNELS; - s->maxdata = 1; - s->range_table = &range_digital; - s->insn_bits = ni_660x_dio_insn_bits; - s->insn_config = ni_660x_dio_insn_config; + s->type = COMEDI_SUBD_DIO; + s->subdev_flags = SDF_READABLE | SDF_WRITABLE; + s->n_chan = NUM_PFI_CHANNELS; + s->maxdata = 1; + s->range_table = &range_digital; + s->insn_bits = ni_660x_dio_insn_bits; + s->insn_config = ni_660x_dio_insn_config; /* * We use the ioconfig registers to control dio direction, so zero |