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Commit b7ea391c authored by Ian Abbott's avatar Ian Abbott Committed by Greg Kroah-Hartman
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staging: comedi: pcl711: add AI cancel handler 



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: default avatarIan Abbott <abbotti@mev.co.uk>
Reviewed-by: default avatarH Hartley Sweeten <hsweeten@visionengravers.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 1b0ef827

drivers/staging/comedi/drivers/pcl711.c

+9 −0
Original line number Diff line number Diff line
@@ -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 */