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staging: comedi: ni_at_a2150: use sample manipulation helpers

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Use the recently added sample manipulation helpers to remove the hardcoded
assumption of the sample size.

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>
This commit is contained in:
H Hartley Sweeten 2014-10-31 12:04:36 -07:00 committed by Greg Kroah-Hartman
parent 14f7b68058
commit 26561101b8
1 changed files with 6 additions and 5 deletions
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11
drivers/staging/comedi/drivers/ni_at_a2150.c
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@ -168,7 +168,6 @@ static irqreturn_t a2150_interrupt(int irq, void *d)
struct comedi_cmd *cmd;
unsigned int max_points, num_points, residue, leftover;
unsigned short dpnt;
static const int sample_size = sizeof(devpriv->dma_buffer[0]);
if (!dev->attached) {
dev_err(dev->class_dev, "premature interrupt\n");
@ -206,12 +205,12 @@ static irqreturn_t a2150_interrupt(int irq, void *d)
clear_dma_ff(devpriv->dma);
/* figure out how many points to read */
max_points = devpriv->dma_transfer_size / sample_size;
max_points = comedi_bytes_to_samples(s, devpriv->dma_transfer_size);
/* residue is the number of points left to be done on the dma
* transfer. It should always be zero at this point unless
* the stop_src is set to external triggering.
*/
residue = get_dma_residue(devpriv->dma) / sample_size;
residue = comedi_bytes_to_samples(s, get_dma_residue(devpriv->dma));
num_points = max_points - residue;
if (devpriv->count < num_points && cmd->stop_src == TRIG_COUNT)
num_points = devpriv->count;
@ -219,7 +218,8 @@ static irqreturn_t a2150_interrupt(int irq, void *d)
/* figure out how many points will be stored next time */
leftover = 0;
if (cmd->stop_src == TRIG_NONE) {
leftover = devpriv->dma_transfer_size / sample_size;
leftover = comedi_bytes_to_samples(s,
devpriv->dma_transfer_size);
} else if (devpriv->count > max_points) {
leftover = devpriv->count - max_points;
if (leftover > max_points)
@ -248,7 +248,8 @@ static irqreturn_t a2150_interrupt(int irq, void *d)
/* re-enable dma */
if (leftover) {
set_dma_addr(devpriv->dma, virt_to_bus(devpriv->dma_buffer));
set_dma_count(devpriv->dma, leftover * sample_size);
set_dma_count(devpriv->dma,
comedi_samples_to_bytes(s, leftover));
enable_dma(devpriv->dma);
}
release_dma_lock(flags);