This driver supports three cmd->start_src values, TRIG_NOW, TRIG_EXT, and
TRIG_INT. TRIG_NOW sources should always have an arg of 0 and arg for TRIG_EXT
sources is driver specific. This driver does not use the cmd->start_arg with
the TRIG_EXT source so a trivial value of 0 is good.
When the cmd->start_src is TRIG_INT the cmd->start_arg is actually the valid
trig_num that is passed to the async (*inttrig) callback. This driver allows
any value to be used and currently carries that value in the private data.
Refactor the (*do_cmdtest) so that the trivial validation of the cmd->start_arg
is clear.
Refactor the (*inttrig) so that the cmd->start_arg is used directly to check
the trig_num and remove the then unused 'ai_inttrig_start' member from the
private data.
Signed-off-by: H Hartley Sweeten <hswee...@visionengravers.com>
Cc: Ian Abbott <abbo...@mev.co.uk>
Cc: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
drivers/staging/comedi/drivers/adl_pci9118.c | 17 ++++++++++++-----
1 file changed, 12 insertions(+), 5 deletions(-)
diff --git a/drivers/staging/comedi/drivers/adl_pci9118.c
b/drivers/staging/comedi/drivers/adl_pci9118.c
index 53bbc59..4be5f67 100644
--- a/drivers/staging/comedi/drivers/adl_pci9118.c
+++ b/drivers/staging/comedi/drivers/adl_pci9118.c
@@ -411,7 +411,6 @@ struct pci9118_private {
*/
unsigned int ai_maskerr; /* which warning was printed */
unsigned int ai_maskharderr; /* on which error bits stops */
- unsigned int ai_inttrig_start; /* TRIG_INT for start */
};
static int check_channel_list(struct comedi_device *dev,
@@ -1135,11 +1134,13 @@ static irqreturn_t interrupt_pci9118(int irq, void *d)
}
static int pci9118_ai_inttrig(struct comedi_device *dev,
- struct comedi_subdevice *s, unsigned int trignum)
+ struct comedi_subdevice *s,
+ unsigned int trig_num)
{
struct pci9118_private *devpriv = dev->private;
+ struct comedi_cmd *cmd = &s->async->cmd;
- if (trignum != devpriv->ai_inttrig_start)
+ if (trig_num != cmd->start_arg)
return -EINVAL;
devpriv->ai12_startstop &= ~START_AI_INT;
@@ -1221,8 +1222,15 @@ static int pci9118_ai_cmdtest(struct comedi_device *dev,
/* Step 3: check if arguments are trivially valid */
- if (cmd->start_src & (TRIG_NOW | TRIG_EXT))
+ switch (cmd->start_src) {
+ case TRIG_NOW:
+ case TRIG_EXT:
err |= cfc_check_trigger_arg_is(&cmd->start_arg, 0);
+ break;
+ case TRIG_INT:
+ /* start_arg is the internal trigger (any value) */
+ break;
+ }
if (cmd->scan_begin_src & (TRIG_FOLLOW | TRIG_EXT))
err |= cfc_check_trigger_arg_is(&cmd->scan_begin_arg, 0);
@@ -1627,7 +1635,6 @@ static int pci9118_ai_cmd(struct comedi_device *dev,
struct comedi_subdevice *s)
}
if (cmd->start_src == TRIG_INT) {
devpriv->ai12_startstop |= START_AI_INT;
- devpriv->ai_inttrig_start = cmd->start_arg;
s->async->inttrig = pci9118_ai_inttrig;
}
#if 0
--
1.8.5.2
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