This driver supports cmd->start_src values of TRIG_NOW, TRIG_EXT, and
TRIG_INT. Currently the cmd->start_arg is only validated for TRIG_NOW.
For TRIG_EXT sources, the cmd->start_src is driver specific. For a
TRIG_INT source, the cmd->start_arg is actually the valid trig_num
that is used by the async (*inttrig) callback.
The cmd->start_arg is currently not use in the driver. Just trivially
validate it to be 0 for all cmd->start_src values.
Refactor the (*inttrig) function so that the cmd->start_arg is used
to check the trig_num instead of the open coded value.
For aesthetics, remove some unnecessary comments in the (*do_cmd)
function.
Signed-off-by: H Hartley Sweeten <hsweeten@xxxxxxxxxxxxxxxxxxx>
Cc: Ian Abbott <abbotti@xxxxxxxxx>
Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/staging/comedi/drivers/usbduxfast.c | 22 +++++++---------------
1 file changed, 7 insertions(+), 15 deletions(-)
diff --git a/drivers/staging/comedi/drivers/usbduxfast.c b/drivers/staging/comedi/drivers/usbduxfast.c
index 9756110..d713a4d 100644
--- a/drivers/staging/comedi/drivers/usbduxfast.c
+++ b/drivers/staging/comedi/drivers/usbduxfast.c
@@ -398,9 +398,7 @@ static int usbduxfast_ai_cmdtest(struct comedi_device *dev,
/* Step 3: check if arguments are trivially valid */
- if (cmd->start_src == TRIG_NOW)
- err |= cfc_check_trigger_arg_is(&cmd->start_arg, 0);
-
+ err |= cfc_check_trigger_arg_is(&cmd->start_arg, 0);
err |= cfc_check_trigger_arg_is(&cmd->scan_end_arg, cmd->chanlist_len);
if (cmd->chanlist_len == 1)
@@ -448,21 +446,20 @@ static int usbduxfast_ai_cmdtest(struct comedi_device *dev,
static int usbduxfast_ai_inttrig(struct comedi_device *dev,
struct comedi_subdevice *s,
- unsigned int trignum)
+ unsigned int trig_num)
{
struct usbduxfast_private *devpriv = dev->private;
+ struct comedi_cmd *cmd = &s->async->cmd;
int ret;
if (!devpriv)
return -EFAULT;
+ if (trig_num != cmd->start_arg)
+ return -EINVAL;
+
down(&devpriv->sem);
- if (trignum != 0) {
- dev_err(dev->class_dev, "invalid trignum\n");
- up(&devpriv->sem);
- return -EINVAL;
- }
if (!devpriv->ai_cmd_running) {
devpriv->ai_cmd_running = 1;
ret = usbduxfast_submit_urb(dev);
@@ -834,12 +831,7 @@ static int usbduxfast_ai_cmd(struct comedi_device *dev,
return ret;
}
s->async->inttrig = NULL;
- } else {
- /*
- * TRIG_INT
- * don't enable the acquision operation
- * wait for an internal signal
- */
+ } else { /* TRIG_EXT */
s->async->inttrig = usbduxfast_ai_inttrig;
}
up(&devpriv->sem);
--
1.8.5.2
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