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staging: comedi: pcl711: add AI cancel handler

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Comedi subdevices that support asynchronous commands should have a
'cancel' handler to stop an in-progress command.  Add such a handler to
the pcl711 driver module.  I think merely setting the acquisition mode
to "software-triggered" would be sufficient, but also clear the
interrupt status for good luck.

Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Reviewed-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Ian Abbott 2013-09-26 10:16:37 +01:00 • committed by Greg Kroah-Hartman
parent 1b0ef827d9
commit b7ea391cc4
1 changed files with 9 additions and 0 deletions
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9
drivers/staging/comedi/drivers/pcl711.c
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@ -189,6 +189,14 @@ static unsigned int pcl711_ai_get_sample(struct comedi_device *dev,
return val & s->maxdata;
}
static int pcl711_ai_cancel(struct comedi_device *dev,
struct comedi_subdevice *s)
{
outb(PCL711_INT_STAT_CLR, dev->iobase + PCL711_INT_STAT_REG);
pcl711_ai_set_mode(dev, PCL711_MODE_SOFTTRIG);
return 0;
}
static irqreturn_t pcl711_interrupt(int irq, void *d)
{
struct comedi_device *dev = d;
@ -493,6 +501,7 @@ static int pcl711_attach(struct comedi_device *dev, struct comedi_devconfig *it)
s->len_chanlist = 1;
s->do_cmdtest = pcl711_ai_cmdtest;
s->do_cmd = pcl711_ai_cmd;
s->cancel = pcl711_ai_cancel;
}
/* Analog Output subdevice */