staging: comedi: comedi_test: remove nano_per_micro

The `static const int nano_per_micro` variable is set to 1000, the
number of nanoseconds in a microsecond.  Remove it and use the
`NSEC_PER_USEC` macro from <linux/time.h> instead.

Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Reviewed-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/staging/comedi/drivers/comedi_test.c b/drivers/staging/comedi/drivers/comedi_test.c
index 53c9a5c..d9810ca 100644 (file)
--- a/drivers/staging/comedi/drivers/comedi_test.c
+++ b/drivers/staging/comedi/drivers/comedi_test.c
@@ -73,9 +73,6 @@ struct waveform_private {
        unsigned int ao_loopbacks[N_CHANS];
 };
 
-/* 1000 nanosec in a microsec */
-static const int nano_per_micro = 1000;
-
 /* fake analog input ranges */
 static const struct comedi_lrange waveform_ai_ranges = {
        2, {
@@ -270,7 +267,7 @@ static int waveform_ai_cmdtest(struct comedi_device *dev,
 
        if (cmd->scan_begin_src == TRIG_TIMER) {
                err |= comedi_check_trigger_arg_min(&cmd->scan_begin_arg,
-                                                   nano_per_micro);
+                                                   NSEC_PER_USEC);
                if (cmd->convert_src == TRIG_TIMER) {
                        err |= comedi_check_trigger_arg_min(&cmd->
                                                            scan_begin_arg,
@@ -296,15 +293,15 @@ static int waveform_ai_cmdtest(struct comedi_device *dev,
        if (cmd->scan_begin_src == TRIG_TIMER) {
                arg = cmd->scan_begin_arg;
                /* round to nearest microsec */
-               arg = nano_per_micro *
-                     ((arg + (nano_per_micro / 2)) / nano_per_micro);
+               arg = NSEC_PER_USEC *
+                     ((arg + (NSEC_PER_USEC / 2)) / NSEC_PER_USEC);
                err |= comedi_check_trigger_arg_is(&cmd->scan_begin_arg, arg);
        }
        if (cmd->convert_src == TRIG_TIMER) {
                arg = cmd->convert_arg;
                /* round to nearest microsec */
-               arg = nano_per_micro *
-                     ((arg + (nano_per_micro / 2)) / nano_per_micro);
+               arg = NSEC_PER_USEC *
+                     ((arg + (NSEC_PER_USEC / 2)) / NSEC_PER_USEC);
                err |= comedi_check_trigger_arg_is(&cmd->convert_arg, arg);
        }
 
@@ -326,12 +323,12 @@ static int waveform_ai_cmd(struct comedi_device *dev,
                return -1;
        }
 
-       devpriv->scan_period = cmd->scan_begin_arg / nano_per_micro;
+       devpriv->scan_period = cmd->scan_begin_arg / NSEC_PER_USEC;
 
        if (cmd->convert_src == TRIG_NOW)
                devpriv->convert_period = 0;
        else    /* TRIG_TIMER */
-               devpriv->convert_period = cmd->convert_arg / nano_per_micro;
+               devpriv->convert_period = cmd->convert_arg / NSEC_PER_USEC;
 
        devpriv->last = ktime_get();
        devpriv->usec_current =