An (*insn_read) can only happen if the subdevice is in a non-busy state,
i.e. an async command is not running. The board reset and subdevice
(*cancel) will ensure that the control bits (devpriv->ctrl) are already
cleared.
The (*insn_read) only needs to enable the software trigger before reading
samples. It should also disable the software trigger when done. Fix the
(*insn_read) to do this.
For aesthetics, rename the function so it has namespace associated with
the driver.
Signed-off-by: H Hartley Sweeten <hsweeten@xxxxxxxxxxxxxxxxxxx>
Cc: Ian Abbott <abbotti@xxxxxxxxx>
Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/staging/comedi/drivers/adv_pci1710.c | 13 +++++++++----
1 file changed, 9 insertions(+), 4 deletions(-)
diff --git a/drivers/staging/comedi/drivers/adv_pci1710.c b/drivers/staging/comedi/drivers/adv_pci1710.c
index 5f1e86e..93b3e3f 100644
--- a/drivers/staging/comedi/drivers/adv_pci1710.c
+++ b/drivers/staging/comedi/drivers/adv_pci1710.c
@@ -325,7 +325,7 @@ static int pci171x_ai_read_sample(struct comedi_device *dev,
return 0;
}
-static int pci171x_ai_insn_read(struct comedi_device *dev,
+static int pci1710_ai_insn_read(struct comedi_device *dev,
struct comedi_subdevice *s,
struct comedi_insn *insn,
unsigned int *data)
@@ -334,9 +334,10 @@ static int pci171x_ai_insn_read(struct comedi_device *dev,
int ret = 0;
int i;
- devpriv->ctrl &= PCI171X_CTRL_CNT0;
- devpriv->ctrl |= PCI171X_CTRL_SW; /* set software trigger */
+ /* enable software trigger */
+ devpriv->ctrl |= PCI171X_CTRL_SW;
outw(devpriv->ctrl, dev->iobase + PCI171X_CTRL_REG);
+
outb(0, dev->iobase + PCI171X_CLRFIFO_REG);
outb(0, dev->iobase + PCI171X_CLRINT_REG);
@@ -359,6 +360,10 @@ static int pci171x_ai_insn_read(struct comedi_device *dev,
data[i] = val;
}
+ /* disable software trigger */
+ devpriv->ctrl &= ~PCI171X_CTRL_SW;
+ outw(devpriv->ctrl, dev->iobase + PCI171X_CTRL_REG);
+
outb(0, dev->iobase + PCI171X_CLRFIFO_REG);
outb(0, dev->iobase + PCI171X_CLRINT_REG);
@@ -802,7 +807,7 @@ static int pci1710_auto_attach(struct comedi_device *dev,
s->n_chan = board->is_pci1713 ? 32 : 16;
s->maxdata = 0x0fff;
s->range_table = board->ai_range;
- s->insn_read = pci171x_ai_insn_read;
+ s->insn_read = pci1710_ai_insn_read;
if (dev->irq) {
dev->read_subdev = s;
s->subdev_flags |= SDF_CMD_READ;
--
2.5.1
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