The AO subdevice (*cancel), ni_ao_reset(), always sets the private
data 'ao_trigger_select' to 0. So when a command is started the
'trigsel' value in ni_ao_cmd_set_trigger() will always start as 0.
Remove the unnecessary member from the private data.
The (*do_cmdtest) validates that the cmd->start_src will only be
TRIG_INT or TRIG_EXT. Refactor ni_ao_cmd_set_trigger() and remove
the BUG() which can never occur.
Signed-off-by: H Hartley Sweeten <hswee...@visionengravers.com>
Reviewed-by: Ian Abbott <abbo...@mev.co.uk>
Cc: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
drivers/staging/comedi/drivers/ni_mio_common.c | 47 ++++++++------------------
drivers/staging/comedi/drivers/ni_stc.h | 1 -
2 files changed, 14 insertions(+), 34 deletions(-)
diff --git a/drivers/staging/comedi/drivers/ni_mio_common.c
b/drivers/staging/comedi/drivers/ni_mio_common.c
index 8c2c4f6..c89bd1f 100644
--- a/drivers/staging/comedi/drivers/ni_mio_common.c
+++ b/drivers/staging/comedi/drivers/ni_mio_common.c
@@ -2967,6 +2967,7 @@ static void ni_ao_cmd_set_trigger(struct comedi_device
*dev,
const struct comedi_cmd *cmd)
{
struct ni_private *devpriv = dev->private;
+ unsigned int trigsel;
ni_stc_writew(dev, NISTC_RESET_AO_CFG_START, NISTC_RESET_REG);
@@ -2980,39 +2981,20 @@ static void ni_ao_cmd_set_trigger(struct comedi_device
*dev,
}
ni_stc_writew(dev, devpriv->ao_mode1, NISTC_AO_MODE1_REG);
- {
- unsigned int trigsel = devpriv->ao_trigger_select;
-
- switch (cmd->start_src) {
- case TRIG_INT:
- case TRIG_NOW:
- trigsel &= ~(NISTC_AO_TRIG_START1_POLARITY |
- NISTC_AO_TRIG_START1_SEL_MASK);
- trigsel |= NISTC_AO_TRIG_START1_EDGE |
- NISTC_AO_TRIG_START1_SYNC;
- break;
- case TRIG_EXT:
- trigsel = NISTC_AO_TRIG_START1_SEL(
- CR_CHAN(cmd->start_arg) + 1);
- if (cmd->start_arg & CR_INVERT)
- /*
- * 0=active high, 1=active low.
- * see daq-stc 3-24 (p186)
- */
- trigsel |= NISTC_AO_TRIG_START1_POLARITY;
- if (cmd->start_arg & CR_EDGE)
- /* 0=edge detection disabled, 1=enabled */
- trigsel |= NISTC_AO_TRIG_START1_EDGE;
- break;
- default:
- BUG();
- break;
- }
-
- devpriv->ao_trigger_select = trigsel;
- ni_stc_writew(dev, devpriv->ao_trigger_select,
- NISTC_AO_TRIG_SEL_REG);
+ if (cmd->start_src == TRIG_INT) {
+ trigsel = NISTC_AO_TRIG_START1_EDGE |
+ NISTC_AO_TRIG_START1_SYNC;
+ } else { /* TRIG_EXT */
+ trigsel = NISTC_AO_TRIG_START1_SEL(CR_CHAN(cmd->start_arg) + 1);
+ /* 0=active high, 1=active low. see daq-stc 3-24 (p186) */
+ if (cmd->start_arg & CR_INVERT)
+ trigsel |= NISTC_AO_TRIG_START1_POLARITY;
+ /* 0=edge detection disabled, 1=enabled */
+ if (cmd->start_arg & CR_EDGE)
+ trigsel |= NISTC_AO_TRIG_START1_EDGE;
}
+ ni_stc_writew(dev, trigsel, NISTC_AO_TRIG_SEL_REG);
+
/* AO_Delayed_START1 = 0, we do not support delayed start...yet */
/* sync */
@@ -3443,7 +3425,6 @@ static int ni_ao_reset(struct comedi_device *dev, struct
comedi_subdevice *s)
devpriv->ao_mode3 = NISTC_AO_MODE3_LAST_GATE_DISABLE;
else
devpriv->ao_mode3 = 0;
- devpriv->ao_trigger_select = 0;
ni_stc_writew(dev, 0, NISTC_AO_PERSONAL_REG);
ni_stc_writew(dev, 0, NISTC_AO_CMD1_REG);
diff --git a/drivers/staging/comedi/drivers/ni_stc.h
b/drivers/staging/comedi/drivers/ni_stc.h
index 896bc02..334a2e1 100644
--- a/drivers/staging/comedi/drivers/ni_stc.h
+++ b/drivers/staging/comedi/drivers/ni_stc.h
@@ -1001,7 +1001,6 @@ struct ni_private {
unsigned short ao_mode3;
unsigned short ao_cmd1;
unsigned short ao_cmd2;
- unsigned short ao_trigger_select;
struct ni_gpct_device *counter_dev;
unsigned short an_trig_etc_reg;
--
2.6.3
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