From: H Hartley Sweeten Date: Tue, 3 May 2016 19:30:01 +0000 (-0700) Subject: staging: comedi: das16m1: convert munge_sample_array() into a subdevice (*munge) X-Git-Tag: v4.8-rc1~193^2~193 X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=commitdiff_plain;h=243c701308e9798d3bdd55cc2446cbbdbc44ea28;p=linux.git staging: comedi: das16m1: convert munge_sample_array() into a subdevice (*munge) 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 Reviewed-by: Ian Abbott Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/staging/comedi/drivers/das16m1.c b/drivers/staging/comedi/drivers/das16m1.c index c0f279638cd8..a8030326980f 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 */