diff options
| author | H Hartley Sweeten <hsweeten@visionengravers.com> | 2015-01-13 10:16:43 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-01-17 14:31:31 -0800 |
| commit | 620ec185a208f5bf54af46912ae75a330697bd3f (patch) | |
| tree | f07f8d4728b8798da378932e3b12e6e43055a1d3 | |
| parent | 0afa6153fb6fd2b1865248d96058b26ae2f1bcf5 (diff) | |
staging: comedi: das1800: remove hard coded 'sample_size'
Use the comedi_bytes_per_sample() helper to remove the hard coded sample_size
in suggest_transfer_size().
The helper function needs to comedi_subdevice pointer. Change the parameters
passed to suggest_transfer_size() and setup_dma() so that this pointer is
available. Rename these functions so they have namespace associated with the
driver.
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/das1800.c | 15 |
1 files changed, 8 insertions, 7 deletions
diff --git a/drivers/staging/comedi/drivers/das1800.c b/drivers/staging/comedi/drivers/das1800.c index 6359fe665ed6..c36ce0c73c68 100644 --- a/drivers/staging/comedi/drivers/das1800.c +++ b/drivers/staging/comedi/drivers/das1800.c @@ -966,11 +966,12 @@ static void das1800_setup_counters(struct comedi_device *dev, } } -/* utility function that suggests a dma transfer size based on the conversion period 'ns' */ -static unsigned int suggest_transfer_size(const struct comedi_cmd *cmd) +static unsigned int das1800_ai_transfer_size(struct comedi_device *dev, + struct comedi_subdevice *s) { + struct comedi_cmd *cmd = &s->async->cmd; unsigned int size = DMA_BUF_SIZE; - static const int sample_size = 2; /* size in bytes of one sample from board */ + unsigned int sample_size = comedi_bytes_per_sample(s); unsigned int fill_time = 300000000; /* target time in nanoseconds for filling dma buffer */ unsigned int max_size; /* maximum size we will allow for a transfer */ @@ -1004,8 +1005,8 @@ static unsigned int suggest_transfer_size(const struct comedi_cmd *cmd) return size; } -/* sets up dma */ -static void setup_dma(struct comedi_device *dev, const struct comedi_cmd *cmd) +static void das1800_ai_setup_dma(struct comedi_device *dev, + struct comedi_subdevice *s) { struct das1800_private *devpriv = dev->private; struct das1800_dma_desc *dma = &devpriv->dma_desc[0]; @@ -1017,7 +1018,7 @@ static void setup_dma(struct comedi_device *dev, const struct comedi_cmd *cmd) devpriv->cur_dma = 0; /* determine a reasonable dma transfer size */ - bytes = suggest_transfer_size(cmd); + bytes = das1800_ai_transfer_size(dev, s); dma->size = bytes; das1800_isadma_program(dma); @@ -1089,7 +1090,7 @@ static int das1800_ai_do_cmd(struct comedi_device *dev, /* setup card and start */ program_chanlist(dev, cmd); das1800_setup_counters(dev, cmd); - setup_dma(dev, cmd); + das1800_ai_setup_dma(dev, s); outb(control_c, dev->iobase + DAS1800_CONTROL_C); /* set conversion rate and length for burst mode */ if (control_c & BMDE) { |