Use comedi_buf_read_samples() to read the analog output samples from
the async buffer. That function will set the COMEDI_CB_BLOCK event
when samples are read from the async buffer. In addition, the core
will also handle the end-of-scan detection and set the COMEDI_CB_EOS
event.
Signed-off-by: H Hartley Sweeten <hsweeten@xxxxxxxxxxxxxxxxxxx>
Cc: Ian Abbott <abbotti@xxxxxxxxx>
Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/staging/comedi/drivers/amplc_pci230.c | 17 ++++++++---------
1 file changed, 8 insertions(+), 9 deletions(-)
diff --git a/drivers/staging/comedi/drivers/amplc_pci230.c b/drivers/staging/comedi/drivers/amplc_pci230.c
index a3b34d8..f9b952f 100644
--- a/drivers/staging/comedi/drivers/amplc_pci230.c
+++ b/drivers/staging/comedi/drivers/amplc_pci230.c
@@ -1075,26 +1075,25 @@ static void pci230_handle_ao_nofifo(struct comedi_device *dev,
struct comedi_subdevice *s)
{
struct pci230_private *devpriv = dev->private;
- unsigned short data;
- int i, ret;
struct comedi_async *async = s->async;
struct comedi_cmd *cmd = &async->cmd;
+ unsigned short data;
+ int i;
if (cmd->stop_src == TRIG_COUNT && devpriv->ao_scan_count == 0)
return;
+
for (i = 0; i < cmd->chanlist_len; i++) {
unsigned int chan = CR_CHAN(cmd->chanlist[i]);
- /* Read sample from Comedi's circular buffer. */
- ret = comedi_buf_get(s, &data);
- if (ret == 0) {
- s->async->events |= COMEDI_CB_OVERFLOW;
+ if (!comedi_buf_read_samples(s, &data, 1)) {
+ async->events |= COMEDI_CB_OVERFLOW;
return;
}
pci230_ao_write_nofifo(dev, data, chan);
s->readback[chan] = data;
}
- async->events |= COMEDI_CB_BLOCK | COMEDI_CB_EOS;
+
if (cmd->stop_src == TRIG_COUNT) {
devpriv->ao_scan_count--;
if (devpriv->ao_scan_count == 0) {
@@ -1171,12 +1170,12 @@ static bool pci230_handle_ao_fifo(struct comedi_device *dev,
unsigned int chan = CR_CHAN(cmd->chanlist[i]);
unsigned short datum;
- comedi_buf_get(s, &datum);
+ comedi_buf_read_samples(s, &datum, 1);
pci230_ao_write_fifo(dev, datum, chan);
s->readback[chan] = datum;
}
}
- events |= COMEDI_CB_EOS | COMEDI_CB_BLOCK;
+
if (cmd->stop_src == TRIG_COUNT) {
devpriv->ao_scan_count -= num_scans;
if (devpriv->ao_scan_count == 0) {
--
2.0.3
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