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staging: comedi: pcl711: put acquired data in buffer for AI command 

The asynchronous command support for the AI subdevice is still missing
one crucial element, it doesn't actually put the acquired data in the
buffer so it can be read()!  Call `comedi_buf_put()` from the interrupt
handler to perform this function.  A return value of 0 from
`comedi_buf_put()` means there was no room in the buffer so set the
`COMEDI_CB_OVERFLOW` and `COMEDI_CB_ERROR` event flags in that case.
Otherwise, set the `COMEDI_CB_BLOCK` and `COMEDI_CB_EOS` event flags to
mark the end of a "scan" (the scan length is currently fixed at one
sample in this driver).

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 10:16:39 +01:00 committed by Greg Kroah-Hartman
parent 2ce4e57b9a
commit a7fa692b5f
1 changed files with 9 additions and 3 deletions
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12
drivers/staging/comedi/drivers/pcl711.c
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@ -213,9 +213,15 @@ static irqreturn_t pcl711_interrupt(int irq, void *d)
outb(PCL711_INT_STAT_CLR, dev->iobase + PCL711_INT_STAT_REG);
if (s->async->cmd.stop_src == TRIG_COUNT && !(--devpriv->ntrig)) {
pcl711_ai_set_mode(dev, PCL711_MODE_SOFTTRIG);
s->async->events |= COMEDI_CB_EOA;
if (comedi_buf_put(s->async, (short)data) == 0) {
s->async->events |= COMEDI_CB_OVERFLOW | COMEDI_CB_ERROR;
} else {
s->async->events |= COMEDI_CB_BLOCK | COMEDI_CB_EOS;
if (s->async->cmd.stop_src == TRIG_COUNT &&
!(--devpriv->ntrig)) {
pcl711_ai_set_mode(dev, PCL711_MODE_SOFTTRIG);
s->async->events |= COMEDI_CB_EOA;
}
}
comedi_event(dev, s);
return IRQ_HANDLED;