staging: comedi: cb_pcidas: don't calc ao pacer divisors twice

The analog output async command can use the pacer for the scan_begin_src.
The (*do_cmdtest) calculates the divisors when validating the cmd argument.

There is no reason to recalc the divisors in the (*do_cmd). Just use the
values from the private data.

For aesthetics, factor out the code that loads the counters to match the
analog input. Refactor the code to use the i8254_set_mode() and i8254_write()
helpers instead of i8254_load(). This allows us to use the I8254_* defines
when setting the mode to clarify the code.

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/cb_pcidas.c b/drivers/staging/comedi/drivers/cb_pcidas.c
index 48ac1f4..0df55dd 100644 (file)
--- a/drivers/staging/comedi/drivers/cb_pcidas.c
+++ b/drivers/staging/comedi/drivers/cb_pcidas.c
@@ -943,7 +943,7 @@ static int cb_pcidas_ai_cmdtest(struct comedi_device *dev,
        return 0;
 }
 
-static void cb_pcidas_load_counters(struct comedi_device *dev)
+static void cb_pcidas_ai_load_counters(struct comedi_device *dev)
 {
        struct cb_pcidas_private *devpriv = dev->private;
        unsigned long timer_base = devpriv->pacer_counter_dio + ADC8254;
@@ -991,7 +991,7 @@ static int cb_pcidas_ai_cmd(struct comedi_device *dev,
 
        /*  load counters */
        if (cmd->scan_begin_src == TRIG_TIMER || cmd->convert_src == TRIG_TIMER)
-               cb_pcidas_load_counters(dev);
+               cb_pcidas_ai_load_counters(dev);
 
        /*  set number of conversions */
        if (cmd->stop_src == TRIG_COUNT)
@@ -1196,6 +1196,18 @@ static int cb_pcidas_ao_inttrig(struct comedi_device *dev,
        return 0;
 }
 
+static void cb_pcidas_ao_load_counters(struct comedi_device *dev)
+{
+       struct cb_pcidas_private *devpriv = dev->private;
+       unsigned long timer_base = devpriv->pacer_counter_dio + DAC8254;
+
+       i8254_set_mode(timer_base, 0, 1, I8254_MODE2 | I8254_BINARY);
+       i8254_set_mode(timer_base, 0, 2, I8254_MODE2 | I8254_BINARY);
+
+       i8254_write(timer_base, 0, 1, devpriv->ao_divisor1);
+       i8254_write(timer_base, 0, 2, devpriv->ao_divisor2);
+}
+
 static int cb_pcidas_ao_cmd(struct comedi_device *dev,
                            struct comedi_subdevice *s)
 {
@@ -1225,18 +1237,9 @@ static int cb_pcidas_ao_cmd(struct comedi_device *dev,
        outw(0, devpriv->ao_registers + DACFIFOCLR);
 
        /*  load counters */
-       if (cmd->scan_begin_src == TRIG_TIMER) {
-               i8253_cascade_ns_to_timer(I8254_OSC_BASE_10MHZ,
-                                         &devpriv->ao_divisor1,
-                                         &devpriv->ao_divisor2,
-                                         &cmd->scan_begin_arg, cmd->flags);
+       if (cmd->scan_begin_src == TRIG_TIMER)
+               cb_pcidas_ao_load_counters(dev);
 
-               /* Write the values of ctr1 and ctr2 into counters 1 and 2 */
-               i8254_load(devpriv->pacer_counter_dio + DAC8254, 0, 1,
-                          devpriv->ao_divisor1, 2);
-               i8254_load(devpriv->pacer_counter_dio + DAC8254, 0, 2,
-                          devpriv->ao_divisor2, 2);
-       }
        /*  set number of conversions */
        if (cmd->stop_src == TRIG_COUNT)
                devpriv->ao_count = cmd->chanlist_len * cmd->stop_arg;