diff options
| author | H Hartley Sweeten <hsweeten@visionengravers.com> | 2014-03-04 11:30:06 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-03-06 17:06:16 -0800 |
| commit | 9fdef9c84a8ca68ac48de4b778ec229744924041 (patch) | |
| tree | c29c8851abcf3d7c87d708b0b001daf1b25069a4 /drivers/staging/comedi/drivers/pcl818.c | |
| parent | 9fd3effaa7334f6061f4ad4b57665f375457d0eb (diff) | |
staging: comedi: pcl818: introduce pcl818_ai_soft_trig()
Introduce a helper function to start a software triggered analog input
conversion.
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/pcl818.c')
| -rw-r--r-- | drivers/staging/comedi/drivers/pcl818.c | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/drivers/staging/comedi/drivers/pcl818.c b/drivers/staging/comedi/drivers/pcl818.c index d90c47db5da3..1783b6f6767e 100644 --- a/drivers/staging/comedi/drivers/pcl818.c +++ b/drivers/staging/comedi/drivers/pcl818.c @@ -406,6 +406,11 @@ static void pcl818_ai_clear_eoc(struct comedi_device *dev) outb(0, dev->iobase + PCL818_CLRINT); } +static void pcl818_ai_soft_trig(struct comedi_device *dev) +{ + /* writing any value triggers a software conversion */ + outb(0, dev->iobase + PCL818_AD_LO); +} static unsigned int pcl818_ai_get_fifo_sample(struct comedi_device *dev, struct comedi_subdevice *s, @@ -915,7 +920,7 @@ static int pcl818_ai_cancel(struct comedi_device *dev, dev->iobase + PCL818_CONTROL); /* Stop A/D */ udelay(1); pcl818_start_pacer(dev, false); - outb(0, dev->iobase + PCL818_AD_LO); + pcl818_ai_soft_trig(dev); pcl818_ai_get_sample(dev, s, NULL); outb(0, dev->iobase + PCL818_CONTROL); /* Stop A/D */ pcl818_ai_clear_eoc(dev); @@ -951,8 +956,7 @@ static int pcl818_ai_insn_read(struct comedi_device *dev, for (i = 0; i < insn->n; i++) { pcl818_ai_clear_eoc(dev); - /* start conversion */ - outb(0, dev->iobase + PCL818_AD_LO); + pcl818_ai_soft_trig(dev); ret = comedi_timeout(dev, s, insn, pcl818_ai_eoc, 0); if (ret) |