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staging: comedi: ni_pcidio: Support trailing edge external trigger

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This patch is ported over by me (Ian Abbott) from the out-of-tree Comedi
git repository at "git://comedi.org/git/comedi/comedi.git".

The original patch is by Nicholas Nell.

The patch adds support for trailing (falling) edge external triggers for
scans in asynchronous command support in the ni_pcidio driver.  This is
supported at least on the PCI-DIO_32HS and PCI-6533 boards; not sure
about the other boards.

Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Cc: Nicholas Nell <nicholas.nell@colorado.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Ian Abbott 2012-01-09 15:47:33 +00:00 • committed by Greg Kroah-Hartman
parent 02f69d6768
commit 22494ed9b8
1 changed files with 15 additions and 4 deletions
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19
drivers/staging/comedi/drivers/ni_pcidio.c
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@ -30,7 +30,7 @@ Status: works
Devices: [National Instruments] PCI-DIO-32HS (ni_pcidio), PXI-6533,
PCI-DIO-96, PCI-DIO-96B, PXI-6508, PCI-6503, PCI-6503B, PCI-6503X,
PXI-6503, PCI-6533, PCI-6534
Updated: Sun, 21 Apr 2002 21:03:38 -0700
Updated: Mon, 09 Jan 2012 14:27:23 +0000
The DIO-96 appears as four 8255 subdevices. See the 8255
driver notes for details.
@ -42,6 +42,11 @@ supports simple digital I/O; no handshaking is supported.
DMA mostly works for the PCI-DIO32HS, but only in timed input mode.
The PCI-DIO-32HS/PCI-6533 has a configurable external trigger. Setting
scan_begin_arg to 0 or CR_EDGE triggers on the leading edge. Setting
scan_begin_arg to CR_INVERT or (CR_EDGE | CR_INVERT) triggers on the
trailing edge.
This driver could be easily modified to support AT-MIO32HS and
AT-MIO96.
@ -845,8 +850,8 @@ static int ni_pcidio_cmdtest(struct comedi_device *dev,
} else {
/* TRIG_EXT */
/* should be level/edge, hi/lo specification here */
if (cmd->scan_begin_arg != 0) {
cmd->scan_begin_arg = 0;
if ((cmd->scan_begin_arg & ~(CR_EDGE | CR_INVERT)) != 0) {
cmd->scan_begin_arg &= (CR_EDGE | CR_INVERT);
err++;
}
}
@ -961,7 +966,13 @@ static int ni_pcidio_cmd(struct comedi_device *dev, struct comedi_subdevice *s)
writeb(0, devpriv->mite->daq_io_addr + Sequence);
writeb(0x00, devpriv->mite->daq_io_addr + ReqReg);
writeb(4, devpriv->mite->daq_io_addr + BlockMode);
writeb(0, devpriv->mite->daq_io_addr + LinePolarities);
if (!(cmd->scan_begin_arg & CR_INVERT)) {
/* Leading Edge pulse mode */
writeb(0, devpriv->mite->daq_io_addr + LinePolarities);
} else {
/* Trailing Edge pulse mode */
writeb(2, devpriv->mite->daq_io_addr + LinePolarities);
}
writeb(0x00, devpriv->mite->daq_io_addr + AckSer);
writel(1, devpriv->mite->daq_io_addr + StartDelay);
writeb(1, devpriv->mite->daq_io_addr + ReqDelay);