Absorb this helper function into the analog input (*do_cmd).
For aesthetics, convert the switch code into if/else.
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/das1800.c | 58 +++++++++++---------------------
1 file changed, 19 insertions(+), 39 deletions(-)
diff --git a/drivers/staging/comedi/drivers/das1800.c
b/drivers/staging/comedi/drivers/das1800.c
index 2f31ed4..d2aab27 100644
--- a/drivers/staging/comedi/drivers/das1800.c
+++ b/drivers/staging/comedi/drivers/das1800.c
@@ -794,44 +794,6 @@ static unsigned char das1800_ai_chanspec_bits(struct
comedi_subdevice *s,
return bits;
}
-static int control_c_bits(struct comedi_subdevice *s,
- const struct comedi_cmd *cmd)
-{
- int control_c;
-
- control_c = das1800_ai_chanspec_bits(s, cmd->chanlist[0]);
-
- /* set clock source to internal or external */
- switch (cmd->scan_begin_src) {
- case TRIG_FOLLOW: /* not in burst mode */
- switch (cmd->convert_src) {
- case TRIG_TIMER:
- /* trig on cascaded counters */
- control_c |= IPCLK;
- break;
- case TRIG_EXT:
- /* trig on falling edge of external trigger */
- control_c |= XPCLK;
- break;
- default:
- break;
- }
- break;
- case TRIG_TIMER:
- /* burst mode with internal pacer clock */
- control_c |= BMDE | IPCLK;
- break;
- case TRIG_EXT:
- /* burst mode with external trigger */
- control_c |= BMDE | XPCLK;
- break;
- default:
- break;
- }
-
- return control_c;
-}
-
static unsigned int das1800_ai_transfer_size(struct comedi_device *dev,
struct comedi_subdevice *s,
unsigned int maxbytes,
@@ -948,7 +910,25 @@ static int das1800_ai_cmd(struct comedi_device *dev,
/* determine proper bits for control registers */
control_a = control_a_bits(cmd);
- control_c = control_c_bits(s, cmd);
+
+ control_c = das1800_ai_chanspec_bits(s, cmd->chanlist[0]);
+ /* set clock source to internal or external */
+ if (cmd->scan_begin_src == TRIG_FOLLOW) {
+ /* not in burst mode */
+ if (cmd->convert_src == TRIG_TIMER) {
+ /* trig on cascaded counters */
+ control_c |= IPCLK;
+ } else { /* TRIG_EXT */
+ /* trig on falling edge of external trigger */
+ control_c |= XPCLK;
+ }
+ } else if (cmd->scan_begin_src == TRIG_TIMER) {
+ /* burst mode with internal pacer clock */
+ control_c |= BMDE | IPCLK;
+ } else { /* TRIG_EXT */
+ /* burst mode with external trigger */
+ control_c |= BMDE | XPCLK;
+ }
/* setup card and start */
program_chanlist(dev, cmd);
--
2.6.3
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