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staging: comedi: comedi_test: make samples unsigned

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Represent the fake samples as unsigned shorts instead of signed shorts,
as this is the usual Comedi convention.  There is no change to the
actual binary representation, although the `cfc_write_to_buffer()` call
currently expects a signed short for some bizarre reason.

Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Ian Abbott 2013-01-04 11:33:24 +00:00 committed by Greg Kroah-Hartman
parent ea4f72b279
commit 8bd48c9ef1
1 changed files with 12 additions and 9 deletions
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21
drivers/staging/comedi/drivers/comedi_test.c
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@ -85,8 +85,9 @@ static const struct comedi_lrange waveform_ai_ranges = {
}
};
static short fake_sawtooth(struct comedi_device *dev, unsigned int range_index,
unsigned long current_time)
static unsigned short fake_sawtooth(struct comedi_device *dev,
unsigned int range_index,
unsigned long current_time)
{
struct waveform_private *devpriv = dev->private;
struct comedi_subdevice *s = dev->read_subdev;
@ -109,9 +110,9 @@ static short fake_sawtooth(struct comedi_device *dev, unsigned int range_index,
return offset + value;
}
static short fake_squarewave(struct comedi_device *dev,
unsigned int range_index,
unsigned long current_time)
static unsigned short fake_squarewave(struct comedi_device *dev,
unsigned int range_index,
unsigned long current_time)
{
struct waveform_private *devpriv = dev->private;
struct comedi_subdevice *s = dev->read_subdev;
@ -131,15 +132,17 @@ static short fake_squarewave(struct comedi_device *dev,
return offset + value;
}
static short fake_flatline(struct comedi_device *dev, unsigned int range_index,
unsigned long current_time)
static unsigned short fake_flatline(struct comedi_device *dev,
unsigned int range_index,
unsigned long current_time)
{
return dev->read_subdev->maxdata / 2;
}
/* generates a different waveform depending on what channel is read */
static short fake_waveform(struct comedi_device *dev, unsigned int channel,
unsigned int range, unsigned long current_time)
static unsigned short fake_waveform(struct comedi_device *dev,
unsigned int channel, unsigned int range,
unsigned long current_time)
{
enum {
SAWTOOTH_CHAN,