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staging: comedi: adv_pci1710: fix ai (*insn_read) 

An (*insn_read) can only happen if the subdevice is in a non-busy state,
i.e. an async command is not running. The board reset and subdevice
(*cancel) will ensure that the control bits (devpriv->ctrl) are already
cleared.

The (*insn_read) only needs to enable the software trigger before reading
samples. It should also disable the software trigger when done. Fix the
(*insn_read) to do this.

For aesthetics, rename the function so it has 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>
This commit is contained in:
H Hartley Sweeten 2015-11-13 11:11:24 -07:00 committed by Greg Kroah-Hartman
parent d0445303f8
commit 5ce4385232
1 changed files with 9 additions and 4 deletions
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13
drivers/staging/comedi/drivers/adv_pci1710.c
View File

@ -325,7 +325,7 @@ static int pci171x_ai_read_sample(struct comedi_device *dev,
return 0;
}
static int pci171x_ai_insn_read(struct comedi_device *dev,
static int pci1710_ai_insn_read(struct comedi_device *dev,
struct comedi_subdevice *s,
struct comedi_insn *insn,
unsigned int *data)
@ -334,9 +334,10 @@ static int pci171x_ai_insn_read(struct comedi_device *dev,
int ret = 0;
int i;
devpriv->ctrl &= PCI171X_CTRL_CNT0;
devpriv->ctrl |= PCI171X_CTRL_SW; /* set software trigger */
/* enable software trigger */
devpriv->ctrl |= PCI171X_CTRL_SW;
outw(devpriv->ctrl, dev->iobase + PCI171X_CTRL_REG);
outb(0, dev->iobase + PCI171X_CLRFIFO_REG);
outb(0, dev->iobase + PCI171X_CLRINT_REG);
@ -359,6 +360,10 @@ static int pci171x_ai_insn_read(struct comedi_device *dev,
data[i] = val;
}
/* disable software trigger */
devpriv->ctrl &= ~PCI171X_CTRL_SW;
outw(devpriv->ctrl, dev->iobase + PCI171X_CTRL_REG);
outb(0, dev->iobase + PCI171X_CLRFIFO_REG);
outb(0, dev->iobase + PCI171X_CLRINT_REG);
@ -802,7 +807,7 @@ static int pci1710_auto_attach(struct comedi_device *dev,
s->n_chan = board->is_pci1713 ? 32 : 16;
s->maxdata = 0x0fff;
s->range_table = board->ai_range;
s->insn_read = pci171x_ai_insn_read;
s->insn_read = pci1710_ai_insn_read;
if (dev->irq) {
dev->read_subdev = s;
s->subdev_flags |= SDF_CMD_READ;