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staging: comedi: ni_labpc: introduce labpc_ai_wait_for_data()

Browse source 
Introduce a helper function to wait for the a/d conversion to
complete.

Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Cc: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
H Hartley Sweeten 2013-03-22 09:50:31 -07:00 • committed by Greg Kroah-Hartman
commit 810c73c7e7
1 changed files with 26 additions and 15 deletions
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41
drivers/staging/comedi/drivers/ni_labpc.c
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@ -206,6 +206,8 @@ NI manuals:
#define INIT_A1_BITS 0x70
#define COUNTER_B_BASE_REG 0x18
#define LABPC_ADC_TIMEOUT 1000
enum scan_mode {
MODE_SINGLE_CHAN,
MODE_SINGLE_CHAN_INTERVAL,
@ -453,6 +455,21 @@ static void labpc_clear_adc_fifo(struct comedi_device *dev)
labpc_read_adc_fifo(dev);
}
static int labpc_ai_wait_for_data(struct comedi_device *dev,
int timeout)
{
struct labpc_private *devpriv = dev->private;
int i;
for (i = 0; i < timeout; i++) {
devpriv->stat1 = devpriv->read_byte(dev->iobase + STATUS1_REG);
if (devpriv->stat1 & DATA_AVAIL_BIT)
return 0;
udelay(1);
}
return -ETIME;
}
static int labpc_ai_insn_read(struct comedi_device *dev,
struct comedi_subdevice *s,
struct comedi_insn *insn,
@ -462,8 +479,8 @@ static int labpc_ai_insn_read(struct comedi_device *dev,
unsigned int chan = CR_CHAN(insn->chanspec);
unsigned int range = CR_RANGE(insn->chanspec);
unsigned int aref = CR_AREF(insn->chanspec);
int timeout = 1000;
int i, n;
int ret;
int i;
/* disable timed conversions, interrupt generation and dma */
labpc_cancel(dev, s);
@ -489,24 +506,18 @@ static int labpc_ai_insn_read(struct comedi_device *dev,
labpc_clear_adc_fifo(dev);
for (n = 0; n < insn->n; n++) {
for (i = 0; i < insn->n; i++) {
/* trigger conversion */
devpriv->write_byte(0x1, dev->iobase + ADC_CONVERT_REG);
for (i = 0; i < timeout; i++) {
if (devpriv->read_byte(dev->iobase +
STATUS1_REG) & DATA_AVAIL_BIT)
break;
udelay(1);
}
if (i == timeout) {
comedi_error(dev, "timeout");
return -ETIME;
}
data[n] = labpc_read_adc_fifo(dev);
ret = labpc_ai_wait_for_data(dev, LABPC_ADC_TIMEOUT);
if (ret)
return ret;
data[i] = labpc_read_adc_fifo(dev);
}
return n;
return insn->n;
}
#ifdef CONFIG_ISA_DMA_API