For aesthetics, convert this function into a subdevice (*munge) function and let
the comedi core handle the munging.
Add a comment about why the data needs to be munged.
Signed-off-by: H Hartley Sweeten <hsweeten@xxxxxxxxxxxxxxxxxxx>
Cc: Ian Abbott <abbotti@xxxxxxxxx>
Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/staging/comedi/drivers/das16m1.c | 16 +++++++++++++---
1 file changed, 13 insertions(+), 3 deletions(-)
diff --git a/drivers/staging/comedi/drivers/das16m1.c b/drivers/staging/comedi/drivers/das16m1.c
index c0f2796..a803032 100644
--- a/drivers/staging/comedi/drivers/das16m1.c
+++ b/drivers/staging/comedi/drivers/das16m1.c
@@ -127,11 +127,21 @@ static void das16m1_ai_set_queue(struct comedi_device *dev,
}
}
-static void munge_sample_array(unsigned short *array, unsigned int num_elements)
+static void das16m1_ai_munge(struct comedi_device *dev,
+ struct comedi_subdevice *s,
+ void *data, unsigned int num_bytes,
+ unsigned int start_chan_index)
{
+ unsigned short *array = data;
+ unsigned int nsamples = comedi_bytes_to_samples(s, num_bytes);
unsigned int i;
- for (i = 0; i < num_elements; i++)
+ /*
+ * The fifo values have the channel number in the lower 4-bits and
+ * the sample in the upper 12-bits. This just shifts the values
+ * to remove the channel numbers.
+ */
+ for (i = 0; i < nsamples; i++)
array[i] = DAS16M1_AI_TO_SAMPLE(array[i]);
}
@@ -410,7 +420,6 @@ static void das16m1_handler(struct comedi_device *dev, unsigned int status)
if (num_samples > DAS16M1_AI_FIFO_SZ)
num_samples = DAS16M1_AI_FIFO_SZ;
insw(dev->iobase, devpriv->ai_buffer, num_samples);
- munge_sample_array(devpriv->ai_buffer, num_samples);
comedi_buf_write_samples(s, devpriv->ai_buffer, num_samples);
devpriv->adc_count += num_samples;
@@ -560,6 +569,7 @@ static int das16m1_attach(struct comedi_device *dev,
s->do_cmd = das16m1_ai_cmd;
s->cancel = das16m1_ai_cancel;
s->poll = das16m1_ai_poll;
+ s->munge = das16m1_ai_munge;
}
/* Digital Input subdevice */
--
2.6.3
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