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| author | H Hartley Sweeten <hsweeten@visionengravers.com> | 2014-04-29 12:59:28 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-05-03 20:06:31 -0400 |
| commit | f513b63f73e8bebc67a74dd46917788bfdf9c7cd (patch) | |
| tree | 76df0a7dbd65a763e0fd4c3a8a17f59c58eb81c5 | |
| parent | 8673804de08f047769d33858ad60a252b241bc76 (diff) | |
| download | linux-f513b63f73e8bebc67a74dd46917788bfdf9c7cd.tar.gz linux-f513b63f73e8bebc67a74dd46917788bfdf9c7cd.tar.bz2 linux-f513b63f73e8bebc67a74dd46917788bfdf9c7cd.zip | |
staging: comedi: cb_pcidas: don't calc ai pacer divisors twice
The analog input async command can use the pacer for the scan_bagin_src
or the convert_src. The (*do_cmdtest) validates that only one of these
sources has the TRIG_TIMER selected and 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.
Also, refactor cb_pcidas_load_counters() 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>
| -rw-r--r-- | drivers/staging/comedi/drivers/cb_pcidas.c | 24 |
1 files changed, 8 insertions, 16 deletions
diff --git a/drivers/staging/comedi/drivers/cb_pcidas.c b/drivers/staging/comedi/drivers/cb_pcidas.c index 26fc00e552a8..48ac1f43a3d4 100644 --- a/drivers/staging/comedi/drivers/cb_pcidas.c +++ b/drivers/staging/comedi/drivers/cb_pcidas.c @@ -943,20 +943,16 @@ static int cb_pcidas_ai_cmdtest(struct comedi_device *dev, return 0; } -static void cb_pcidas_load_counters(struct comedi_device *dev, unsigned int *ns, - int rounding_flags) +static void cb_pcidas_load_counters(struct comedi_device *dev) { struct cb_pcidas_private *devpriv = dev->private; + unsigned long timer_base = devpriv->pacer_counter_dio + ADC8254; - i8253_cascade_ns_to_timer(I8254_OSC_BASE_10MHZ, - &devpriv->divisor1, &devpriv->divisor2, - ns, rounding_flags); + i8254_set_mode(timer_base, 0, 1, I8254_MODE2 | I8254_BINARY); + i8254_set_mode(timer_base, 0, 2, I8254_MODE2 | I8254_BINARY); - /* Write the values of ctr1 and ctr2 into counters 1 and 2 */ - i8254_load(devpriv->pacer_counter_dio + ADC8254, 0, 1, - devpriv->divisor1, 2); - i8254_load(devpriv->pacer_counter_dio + ADC8254, 0, 2, - devpriv->divisor2, 2); + i8254_write(timer_base, 0, 1, devpriv->divisor1); + i8254_write(timer_base, 0, 2, devpriv->divisor2); } static int cb_pcidas_ai_cmd(struct comedi_device *dev, @@ -994,12 +990,8 @@ static int cb_pcidas_ai_cmd(struct comedi_device *dev, outw(bits, devpriv->control_status + ADCMUX_CONT); /* load counters */ - if (cmd->convert_src == TRIG_TIMER) - cb_pcidas_load_counters(dev, &cmd->convert_arg, - cmd->flags & TRIG_ROUND_MASK); - else if (cmd->scan_begin_src == TRIG_TIMER) - cb_pcidas_load_counters(dev, &cmd->scan_begin_arg, - cmd->flags & TRIG_ROUND_MASK); + if (cmd->scan_begin_src == TRIG_TIMER || cmd->convert_src == TRIG_TIMER) + cb_pcidas_load_counters(dev); /* set number of conversions */ if (cmd->stop_src == TRIG_COUNT) |