diff options
| author | H Hartley Sweeten <hsweeten@visionengravers.com> | 2014-04-29 12:59:55 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-05-03 20:06:35 -0400 |
| commit | 52c9e62cf3247cb0599197e7a27356e6a2513a80 (patch) | |
| tree | 344b56c8602e8f1cf2a54405839231b0f5eb7e88 /drivers/staging | |
| parent | 90c32ce300fb79f45d55803bc021c4e49ed9b85f (diff) | |
staging: comedi: das800: clarify 8254 timer programming
Refactor the 8254 timer programming to use the i8254_set_mode()
and i8254_write() helpers instead of i8254_load(). This allows
us to use the I8254_MODE* defines to clarify the code.
The das800_set_frequency() function will not fail. For aesthetics
change the return to a void and remove the error handling.
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>
Diffstat (limited to 'drivers/staging')
| -rw-r--r-- | drivers/staging/comedi/drivers/das800.c | 21 |
1 files changed, 7 insertions, 14 deletions
diff --git a/drivers/staging/comedi/drivers/das800.c b/drivers/staging/comedi/drivers/das800.c index e2dc43dbdc5e..615ae3f1c6cc 100644 --- a/drivers/staging/comedi/drivers/das800.c +++ b/drivers/staging/comedi/drivers/das800.c @@ -275,19 +275,15 @@ static void das800_disable(struct comedi_device *dev) spin_unlock_irqrestore(&dev->spinlock, irq_flags); } -static int das800_set_frequency(struct comedi_device *dev) +static void das800_set_frequency(struct comedi_device *dev) { struct das800_private *devpriv = dev->private; - int err = 0; - - if (i8254_load(dev->iobase + DAS800_8254, 0, 1, devpriv->divisor1, 2)) - err++; - if (i8254_load(dev->iobase + DAS800_8254, 0, 2, devpriv->divisor2, 2)) - err++; - if (err) - return -1; + unsigned long timer_base = dev->iobase + DAS800_8254; - return 0; + 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->divisor1); + i8254_write(timer_base, 0, 2, devpriv->divisor2); } static int das800_cancel(struct comedi_device *dev, struct comedi_subdevice *s) @@ -448,10 +444,7 @@ static int das800_ai_do_cmd(struct comedi_device *dev, if (async->cmd.convert_src == TRIG_TIMER) { conv_bits |= CASC | ITE; /* set conversion frequency */ - if (das800_set_frequency(dev) < 0) { - comedi_error(dev, "Error setting up counters"); - return -1; - } + das800_set_frequency(dev); } spin_lock_irqsave(&dev->spinlock, irq_flags); |