staging: comedi: usbdux: use comedi_async 'scans_done' to detect AO EOA

Remove the private data member 'ao_sample_count' and use the comedi_async
'scans_done' member to detect the analog output end-of-acquisition.

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

diff --git a/drivers/staging/comedi/drivers/usbdux.c b/drivers/staging/comedi/drivers/usbdux.c
index 40f5cd0..7782015 100644 (file)
--- a/drivers/staging/comedi/drivers/usbdux.c
+++ b/drivers/staging/comedi/drivers/usbdux.c
@@ -204,7 +204,6 @@ struct usbdux_private {
 
        /* number of samples to acquire */
        int ai_sample_count;
-       int ao_sample_count;
        /* time between samples in units of the timer */
        unsigned int ai_timer;
        unsigned int ao_timer;
@@ -397,12 +396,10 @@ static void usbduxsub_ao_handle_urb(struct comedi_device *dev,
        if (devpriv->ao_counter == 0) {
                devpriv->ao_counter = devpriv->ao_timer;
 
-               if (cmd->stop_src == TRIG_COUNT) {
-                       devpriv->ao_sample_count--;
-                       if (devpriv->ao_sample_count < 0) {
-                               async->events |= COMEDI_CB_EOA;
-                               return;
-                       }
+               if (cmd->stop_src == TRIG_COUNT &&
+                   async->scans_done >= cmd->stop_arg) {
+                       async->events |= COMEDI_CB_EOA;
+                       return;
                }
 
                /* transmit data to the USB bus */
@@ -1011,24 +1008,6 @@ static int usbdux_ao_cmd(struct comedi_device *dev, struct comedi_subdevice *s)
 
        devpriv->ao_counter = devpriv->ao_timer;
 
-       if (cmd->stop_src == TRIG_COUNT) {
-               /* not continuous */
-               /* counter */
-               /* high speed also scans everything at once */
-               if (0) {        /* (devpriv->high_speed) */
-                       devpriv->ao_sample_count = cmd->stop_arg *
-                                                  cmd->scan_end_arg;
-               } else {
-                       /* there's no scan as the scan has been */
-                       /* perf inside the FX2 */
-                       /* data arrives as one packet */
-                       devpriv->ao_sample_count = cmd->stop_arg;
-               }
-       } else {
-               /* continous acquisition */
-               devpriv->ao_sample_count = 0;
-       }
-
        if (cmd->start_src == TRIG_NOW) {
                /* enable this acquisition operation */
                devpriv->ao_cmd_running = 1;